Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NET3 Protocol independent device support routines. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Derived from the non IP parts of dev.c 1.0.19 |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> |
| 13 | * |
| 14 | * Additional Authors: |
| 15 | * Florian la Roche <rzsfl@rz.uni-sb.de> |
| 16 | * Alan Cox <gw4pts@gw4pts.ampr.org> |
| 17 | * David Hinds <dahinds@users.sourceforge.net> |
| 18 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| 19 | * Adam Sulmicki <adam@cfar.umd.edu> |
| 20 | * Pekka Riikonen <priikone@poesidon.pspt.fi> |
| 21 | * |
| 22 | * Changes: |
| 23 | * D.J. Barrow : Fixed bug where dev->refcnt gets set |
| 24 | * to 2 if register_netdev gets called |
| 25 | * before net_dev_init & also removed a |
| 26 | * few lines of code in the process. |
| 27 | * Alan Cox : device private ioctl copies fields back. |
| 28 | * Alan Cox : Transmit queue code does relevant |
| 29 | * stunts to keep the queue safe. |
| 30 | * Alan Cox : Fixed double lock. |
| 31 | * Alan Cox : Fixed promisc NULL pointer trap |
| 32 | * ???????? : Support the full private ioctl range |
| 33 | * Alan Cox : Moved ioctl permission check into |
| 34 | * drivers |
| 35 | * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI |
| 36 | * Alan Cox : 100 backlog just doesn't cut it when |
| 37 | * you start doing multicast video 8) |
| 38 | * Alan Cox : Rewrote net_bh and list manager. |
| 39 | * Alan Cox : Fix ETH_P_ALL echoback lengths. |
| 40 | * Alan Cox : Took out transmit every packet pass |
| 41 | * Saved a few bytes in the ioctl handler |
| 42 | * Alan Cox : Network driver sets packet type before |
| 43 | * calling netif_rx. Saves a function |
| 44 | * call a packet. |
| 45 | * Alan Cox : Hashed net_bh() |
| 46 | * Richard Kooijman: Timestamp fixes. |
| 47 | * Alan Cox : Wrong field in SIOCGIFDSTADDR |
| 48 | * Alan Cox : Device lock protection. |
| 49 | * Alan Cox : Fixed nasty side effect of device close |
| 50 | * changes. |
| 51 | * Rudi Cilibrasi : Pass the right thing to |
| 52 | * set_mac_address() |
| 53 | * Dave Miller : 32bit quantity for the device lock to |
| 54 | * make it work out on a Sparc. |
| 55 | * Bjorn Ekwall : Added KERNELD hack. |
| 56 | * Alan Cox : Cleaned up the backlog initialise. |
| 57 | * Craig Metz : SIOCGIFCONF fix if space for under |
| 58 | * 1 device. |
| 59 | * Thomas Bogendoerfer : Return ENODEV for dev_open, if there |
| 60 | * is no device open function. |
| 61 | * Andi Kleen : Fix error reporting for SIOCGIFCONF |
| 62 | * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF |
| 63 | * Cyrus Durgin : Cleaned for KMOD |
| 64 | * Adam Sulmicki : Bug Fix : Network Device Unload |
| 65 | * A network device unload needs to purge |
| 66 | * the backlog queue. |
| 67 | * Paul Rusty Russell : SIOCSIFNAME |
| 68 | * Pekka Riikonen : Netdev boot-time settings code |
| 69 | * Andrew Morton : Make unregister_netdevice wait |
| 70 | * indefinitely on dev->refcnt |
| 71 | * J Hadi Salim : - Backlog queue sampling |
| 72 | * - netif_rx() feedback |
| 73 | */ |
| 74 | |
| 75 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <linux/bitops.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 77 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | #include <linux/cpu.h> |
| 79 | #include <linux/types.h> |
| 80 | #include <linux/kernel.h> |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 81 | #include <linux/hash.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 82 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #include <linux/sched.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 84 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | #include <linux/string.h> |
| 86 | #include <linux/mm.h> |
| 87 | #include <linux/socket.h> |
| 88 | #include <linux/sockios.h> |
| 89 | #include <linux/errno.h> |
| 90 | #include <linux/interrupt.h> |
| 91 | #include <linux/if_ether.h> |
| 92 | #include <linux/netdevice.h> |
| 93 | #include <linux/etherdevice.h> |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 94 | #include <linux/ethtool.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #include <linux/notifier.h> |
| 96 | #include <linux/skbuff.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 97 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <net/sock.h> |
| 99 | #include <linux/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #include <linux/stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #include <net/dst.h> |
| 102 | #include <net/pkt_sched.h> |
| 103 | #include <net/checksum.h> |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 104 | #include <net/xfrm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #include <linux/highmem.h> |
| 106 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #include <linux/netpoll.h> |
| 109 | #include <linux/rcupdate.h> |
| 110 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | #include <net/iw_handler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | #include <asm/current.h> |
Steve Grubb | 5bdb988 | 2005-12-03 08:39:35 -0500 | [diff] [blame] | 113 | #include <linux/audit.h> |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 114 | #include <linux/dmaengine.h> |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 115 | #include <linux/err.h> |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 116 | #include <linux/ctype.h> |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 117 | #include <linux/if_arp.h> |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 118 | #include <linux/if_vlan.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 119 | #include <linux/ip.h> |
Alexander Duyck | ad55dca | 2008-09-20 22:05:50 -0700 | [diff] [blame] | 120 | #include <net/ip.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 121 | #include <linux/ipv6.h> |
| 122 | #include <linux/in.h> |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 123 | #include <linux/jhash.h> |
| 124 | #include <linux/random.h> |
David S. Miller | 9cbc1cb | 2009-06-15 03:02:23 -0700 | [diff] [blame] | 125 | #include <trace/events/napi.h> |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 126 | #include <trace/events/net.h> |
Koki Sanagi | 07dc22e | 2010-08-23 18:46:12 +0900 | [diff] [blame] | 127 | #include <trace/events/skb.h> |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 128 | #include <linux/pci.h> |
Stephen Rothwell | caeda9b | 2010-09-16 21:39:16 -0700 | [diff] [blame] | 129 | #include <linux/inetdevice.h> |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 130 | #include <linux/cpu_rmap.h> |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 131 | #include <linux/static_key.h> |
Eliezer Tamir | af12fa6 | 2013-06-10 11:39:41 +0300 | [diff] [blame] | 132 | #include <linux/hashtable.h> |
Eric Dumazet | 60877a3 | 2013-06-20 01:15:51 -0700 | [diff] [blame] | 133 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Pavel Emelyanov | 342709e | 2007-10-23 21:14:45 -0700 | [diff] [blame] | 135 | #include "net-sysfs.h" |
| 136 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 137 | /* Instead of increasing this, you should create a hash table. */ |
| 138 | #define MAX_GRO_SKBS 8 |
| 139 | |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 140 | /* This should be increased if a protocol with a bigger head is added. */ |
| 141 | #define GRO_MAX_HEAD (MAX_HEADER + 128) |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | static DEFINE_SPINLOCK(ptype_lock); |
Vlad Yasevich | 62532da | 2012-11-15 08:49:10 +0000 | [diff] [blame] | 144 | static DEFINE_SPINLOCK(offload_lock); |
Cong Wang | 900ff8c | 2013-02-18 19:20:33 +0000 | [diff] [blame] | 145 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
| 146 | struct list_head ptype_all __read_mostly; /* Taps */ |
Vlad Yasevich | 62532da | 2012-11-15 08:49:10 +0000 | [diff] [blame] | 147 | static struct list_head offload_base __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | /* |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 150 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | * semaphore. |
| 152 | * |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 153 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | * |
| 155 | * Writers must hold the rtnl semaphore while they loop through the |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 156 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | * actual updates. This allows pure readers to access the list even |
| 158 | * while a writer is preparing to update it. |
| 159 | * |
| 160 | * To put it another way, dev_base_lock is held for writing only to |
| 161 | * protect against pure readers; the rtnl semaphore provides the |
| 162 | * protection against other writers. |
| 163 | * |
| 164 | * See, for example usages, register_netdevice() and |
| 165 | * unregister_netdevice(), which must be called with the rtnl |
| 166 | * semaphore held. |
| 167 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | DEFINE_RWLOCK(dev_base_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | EXPORT_SYMBOL(dev_base_lock); |
| 170 | |
Eliezer Tamir | af12fa6 | 2013-06-10 11:39:41 +0300 | [diff] [blame] | 171 | /* protects napi_hash addition/deletion and napi_gen_id */ |
| 172 | static DEFINE_SPINLOCK(napi_hash_lock); |
| 173 | |
| 174 | static unsigned int napi_gen_id; |
| 175 | static DEFINE_HASHTABLE(napi_hash, 8); |
| 176 | |
Thomas Gleixner | 18afa4b | 2013-07-23 16:13:17 +0200 | [diff] [blame] | 177 | static seqcount_t devnet_rename_seq; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 178 | |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 179 | static inline void dev_base_seq_inc(struct net *net) |
| 180 | { |
| 181 | while (++net->dev_base_seq == 0); |
| 182 | } |
| 183 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 184 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 186 | unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
| 187 | |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 188 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 191 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | { |
Eric Dumazet | 7c28bd0 | 2009-10-24 06:13:17 -0700 | [diff] [blame] | 193 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 196 | static inline void rps_lock(struct softnet_data *sd) |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 197 | { |
| 198 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 199 | spin_lock(&sd->input_pkt_queue.lock); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 200 | #endif |
| 201 | } |
| 202 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 203 | static inline void rps_unlock(struct softnet_data *sd) |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 204 | { |
| 205 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 206 | spin_unlock(&sd->input_pkt_queue.lock); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 207 | #endif |
| 208 | } |
| 209 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 210 | /* Device list insertion */ |
dingtianhong | 53759be | 2013-04-17 22:17:50 +0000 | [diff] [blame] | 211 | static void list_netdevice(struct net_device *dev) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 212 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 213 | struct net *net = dev_net(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 214 | |
| 215 | ASSERT_RTNL(); |
| 216 | |
| 217 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 218 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 219 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 220 | hlist_add_head_rcu(&dev->index_hlist, |
| 221 | dev_index_hash(net, dev->ifindex)); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 222 | write_unlock_bh(&dev_base_lock); |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 223 | |
| 224 | dev_base_seq_inc(net); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 225 | } |
| 226 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 227 | /* Device list removal |
| 228 | * caller must respect a RCU grace period before freeing/reusing dev |
| 229 | */ |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 230 | static void unlist_netdevice(struct net_device *dev) |
| 231 | { |
| 232 | ASSERT_RTNL(); |
| 233 | |
| 234 | /* Unlink dev from the device chain */ |
| 235 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 236 | list_del_rcu(&dev->dev_list); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 237 | hlist_del_rcu(&dev->name_hlist); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 238 | hlist_del_rcu(&dev->index_hlist); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 239 | write_unlock_bh(&dev_base_lock); |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 240 | |
| 241 | dev_base_seq_inc(dev_net(dev)); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 242 | } |
| 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | /* |
| 245 | * Our notifier list |
| 246 | */ |
| 247 | |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 248 | static RAW_NOTIFIER_HEAD(netdev_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | /* |
| 251 | * Device drivers call our routines to queue packets here. We empty the |
| 252 | * queue in the local softnet handler. |
| 253 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 254 | |
Eric Dumazet | 9958da0 | 2010-04-17 04:17:02 +0000 | [diff] [blame] | 255 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 256 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 258 | #ifdef CONFIG_LOCKDEP |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 259 | /* |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 260 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 261 | * according to dev->type |
| 262 | */ |
| 263 | static const unsigned short netdev_lock_type[] = |
| 264 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, |
| 265 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
| 266 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, |
| 267 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, |
| 268 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, |
| 269 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, |
| 270 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, |
| 271 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, |
| 272 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, |
| 273 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, |
| 274 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, |
| 275 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, |
Paul Gortmaker | 211ed86 | 2012-05-10 17:14:35 -0400 | [diff] [blame] | 276 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
| 277 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, |
| 278 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 279 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 280 | static const char *const netdev_lock_name[] = |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 281 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
| 282 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", |
| 283 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", |
| 284 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", |
| 285 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", |
| 286 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", |
| 287 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", |
| 288 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", |
| 289 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", |
| 290 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", |
| 291 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", |
| 292 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", |
Paul Gortmaker | 211ed86 | 2012-05-10 17:14:35 -0400 | [diff] [blame] | 293 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", |
| 294 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", |
| 295 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 296 | |
| 297 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 298 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 299 | |
| 300 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) |
| 301 | { |
| 302 | int i; |
| 303 | |
| 304 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) |
| 305 | if (netdev_lock_type[i] == dev_type) |
| 306 | return i; |
| 307 | /* the last key is used by default */ |
| 308 | return ARRAY_SIZE(netdev_lock_type) - 1; |
| 309 | } |
| 310 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 311 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 312 | unsigned short dev_type) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 313 | { |
| 314 | int i; |
| 315 | |
| 316 | i = netdev_lock_pos(dev_type); |
| 317 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], |
| 318 | netdev_lock_name[i]); |
| 319 | } |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 320 | |
| 321 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
| 322 | { |
| 323 | int i; |
| 324 | |
| 325 | i = netdev_lock_pos(dev->type); |
| 326 | lockdep_set_class_and_name(&dev->addr_list_lock, |
| 327 | &netdev_addr_lock_key[i], |
| 328 | netdev_lock_name[i]); |
| 329 | } |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 330 | #else |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 331 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 332 | unsigned short dev_type) |
| 333 | { |
| 334 | } |
| 335 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 336 | { |
| 337 | } |
| 338 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | /******************************************************************************* |
| 341 | |
| 342 | Protocol management and registration routines |
| 343 | |
| 344 | *******************************************************************************/ |
| 345 | |
| 346 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | * Add a protocol ID to the list. Now that the input handler is |
| 348 | * smarter we can dispense with all the messy stuff that used to be |
| 349 | * here. |
| 350 | * |
| 351 | * BEWARE!!! Protocol handlers, mangling input packets, |
| 352 | * MUST BE last in hash buckets and checking protocol handlers |
| 353 | * MUST start from promiscuous ptype_all chain in net_bh. |
| 354 | * It is true now, do not change it. |
| 355 | * Explanation follows: if protocol handler, mangling packet, will |
| 356 | * be the first on list, it is not able to sense, that packet |
| 357 | * is cloned and should be copied-on-write, so that it will |
| 358 | * change it and subsequent readers will get broken packet. |
| 359 | * --ANK (980803) |
| 360 | */ |
| 361 | |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 362 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
| 363 | { |
| 364 | if (pt->type == htons(ETH_P_ALL)) |
| 365 | return &ptype_all; |
| 366 | else |
| 367 | return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
| 368 | } |
| 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | /** |
| 371 | * dev_add_pack - add packet handler |
| 372 | * @pt: packet type declaration |
| 373 | * |
| 374 | * Add a protocol handler to the networking stack. The passed &packet_type |
| 375 | * is linked into kernel lists and may not be freed until it has been |
| 376 | * removed from the kernel lists. |
| 377 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 378 | * This call does not sleep therefore it can not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | * guarantee all CPU's that are in middle of receiving packets |
| 380 | * will see the new packet type (until the next received packet). |
| 381 | */ |
| 382 | |
| 383 | void dev_add_pack(struct packet_type *pt) |
| 384 | { |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 385 | struct list_head *head = ptype_head(pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 387 | spin_lock(&ptype_lock); |
| 388 | list_add_rcu(&pt->list, head); |
| 389 | spin_unlock(&ptype_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 391 | EXPORT_SYMBOL(dev_add_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | /** |
| 394 | * __dev_remove_pack - remove packet handler |
| 395 | * @pt: packet type declaration |
| 396 | * |
| 397 | * Remove a protocol handler that was previously added to the kernel |
| 398 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 399 | * from the kernel lists and can be freed or reused once this function |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 400 | * returns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | * |
| 402 | * The packet type might still be in use by receivers |
| 403 | * and must not be freed until after all the CPU's have gone |
| 404 | * through a quiescent state. |
| 405 | */ |
| 406 | void __dev_remove_pack(struct packet_type *pt) |
| 407 | { |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 408 | struct list_head *head = ptype_head(pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | struct packet_type *pt1; |
| 410 | |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 411 | spin_lock(&ptype_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | list_for_each_entry(pt1, head, list) { |
| 414 | if (pt == pt1) { |
| 415 | list_del_rcu(&pt->list); |
| 416 | goto out; |
| 417 | } |
| 418 | } |
| 419 | |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 420 | pr_warn("dev_remove_pack: %p not found\n", pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | out: |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 422 | spin_unlock(&ptype_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 424 | EXPORT_SYMBOL(__dev_remove_pack); |
| 425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | /** |
| 427 | * dev_remove_pack - remove packet handler |
| 428 | * @pt: packet type declaration |
| 429 | * |
| 430 | * Remove a protocol handler that was previously added to the kernel |
| 431 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 432 | * from the kernel lists and can be freed or reused once this function |
| 433 | * returns. |
| 434 | * |
| 435 | * This call sleeps to guarantee that no CPU is looking at the packet |
| 436 | * type after return. |
| 437 | */ |
| 438 | void dev_remove_pack(struct packet_type *pt) |
| 439 | { |
| 440 | __dev_remove_pack(pt); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | synchronize_net(); |
| 443 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 444 | EXPORT_SYMBOL(dev_remove_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Vlad Yasevich | 62532da | 2012-11-15 08:49:10 +0000 | [diff] [blame] | 446 | |
| 447 | /** |
| 448 | * dev_add_offload - register offload handlers |
| 449 | * @po: protocol offload declaration |
| 450 | * |
| 451 | * Add protocol offload handlers to the networking stack. The passed |
| 452 | * &proto_offload is linked into kernel lists and may not be freed until |
| 453 | * it has been removed from the kernel lists. |
| 454 | * |
| 455 | * This call does not sleep therefore it can not |
| 456 | * guarantee all CPU's that are in middle of receiving packets |
| 457 | * will see the new offload handlers (until the next received packet). |
| 458 | */ |
| 459 | void dev_add_offload(struct packet_offload *po) |
| 460 | { |
| 461 | struct list_head *head = &offload_base; |
| 462 | |
| 463 | spin_lock(&offload_lock); |
| 464 | list_add_rcu(&po->list, head); |
| 465 | spin_unlock(&offload_lock); |
| 466 | } |
| 467 | EXPORT_SYMBOL(dev_add_offload); |
| 468 | |
| 469 | /** |
| 470 | * __dev_remove_offload - remove offload handler |
| 471 | * @po: packet offload declaration |
| 472 | * |
| 473 | * Remove a protocol offload handler that was previously added to the |
| 474 | * kernel offload handlers by dev_add_offload(). The passed &offload_type |
| 475 | * is removed from the kernel lists and can be freed or reused once this |
| 476 | * function returns. |
| 477 | * |
| 478 | * The packet type might still be in use by receivers |
| 479 | * and must not be freed until after all the CPU's have gone |
| 480 | * through a quiescent state. |
| 481 | */ |
| 482 | void __dev_remove_offload(struct packet_offload *po) |
| 483 | { |
| 484 | struct list_head *head = &offload_base; |
| 485 | struct packet_offload *po1; |
| 486 | |
Eric Dumazet | c53aa50 | 2012-11-16 08:08:23 +0000 | [diff] [blame] | 487 | spin_lock(&offload_lock); |
Vlad Yasevich | 62532da | 2012-11-15 08:49:10 +0000 | [diff] [blame] | 488 | |
| 489 | list_for_each_entry(po1, head, list) { |
| 490 | if (po == po1) { |
| 491 | list_del_rcu(&po->list); |
| 492 | goto out; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | pr_warn("dev_remove_offload: %p not found\n", po); |
| 497 | out: |
Eric Dumazet | c53aa50 | 2012-11-16 08:08:23 +0000 | [diff] [blame] | 498 | spin_unlock(&offload_lock); |
Vlad Yasevich | 62532da | 2012-11-15 08:49:10 +0000 | [diff] [blame] | 499 | } |
| 500 | EXPORT_SYMBOL(__dev_remove_offload); |
| 501 | |
| 502 | /** |
| 503 | * dev_remove_offload - remove packet offload handler |
| 504 | * @po: packet offload declaration |
| 505 | * |
| 506 | * Remove a packet offload handler that was previously added to the kernel |
| 507 | * offload handlers by dev_add_offload(). The passed &offload_type is |
| 508 | * removed from the kernel lists and can be freed or reused once this |
| 509 | * function returns. |
| 510 | * |
| 511 | * This call sleeps to guarantee that no CPU is looking at the packet |
| 512 | * type after return. |
| 513 | */ |
| 514 | void dev_remove_offload(struct packet_offload *po) |
| 515 | { |
| 516 | __dev_remove_offload(po); |
| 517 | |
| 518 | synchronize_net(); |
| 519 | } |
| 520 | EXPORT_SYMBOL(dev_remove_offload); |
| 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | /****************************************************************************** |
| 523 | |
| 524 | Device Boot-time Settings Routines |
| 525 | |
| 526 | *******************************************************************************/ |
| 527 | |
| 528 | /* Boot time configuration table */ |
| 529 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; |
| 530 | |
| 531 | /** |
| 532 | * netdev_boot_setup_add - add new setup entry |
| 533 | * @name: name of the device |
| 534 | * @map: configured settings for the device |
| 535 | * |
| 536 | * Adds new setup entry to the dev_boot_setup list. The function |
| 537 | * returns 0 on error and 1 on success. This is a generic routine to |
| 538 | * all netdevices. |
| 539 | */ |
| 540 | static int netdev_boot_setup_add(char *name, struct ifmap *map) |
| 541 | { |
| 542 | struct netdev_boot_setup *s; |
| 543 | int i; |
| 544 | |
| 545 | s = dev_boot_setup; |
| 546 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 547 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { |
| 548 | memset(s[i].name, 0, sizeof(s[i].name)); |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 549 | strlcpy(s[i].name, name, IFNAMSIZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
| 551 | break; |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; |
| 556 | } |
| 557 | |
| 558 | /** |
| 559 | * netdev_boot_setup_check - check boot time settings |
| 560 | * @dev: the netdevice |
| 561 | * |
| 562 | * Check boot time settings for the device. |
| 563 | * The found settings are set for the device to be used |
| 564 | * later in the device probing. |
| 565 | * Returns 0 if no settings found, 1 if they are. |
| 566 | */ |
| 567 | int netdev_boot_setup_check(struct net_device *dev) |
| 568 | { |
| 569 | struct netdev_boot_setup *s = dev_boot_setup; |
| 570 | int i; |
| 571 | |
| 572 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 573 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 574 | !strcmp(dev->name, s[i].name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | dev->irq = s[i].map.irq; |
| 576 | dev->base_addr = s[i].map.base_addr; |
| 577 | dev->mem_start = s[i].map.mem_start; |
| 578 | dev->mem_end = s[i].map.mem_end; |
| 579 | return 1; |
| 580 | } |
| 581 | } |
| 582 | return 0; |
| 583 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 584 | EXPORT_SYMBOL(netdev_boot_setup_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | |
| 587 | /** |
| 588 | * netdev_boot_base - get address from boot time settings |
| 589 | * @prefix: prefix for network device |
| 590 | * @unit: id for network device |
| 591 | * |
| 592 | * Check boot time settings for the base address of device. |
| 593 | * The found settings are set for the device to be used |
| 594 | * later in the device probing. |
| 595 | * Returns 0 if no settings found. |
| 596 | */ |
| 597 | unsigned long netdev_boot_base(const char *prefix, int unit) |
| 598 | { |
| 599 | const struct netdev_boot_setup *s = dev_boot_setup; |
| 600 | char name[IFNAMSIZ]; |
| 601 | int i; |
| 602 | |
| 603 | sprintf(name, "%s%d", prefix, unit); |
| 604 | |
| 605 | /* |
| 606 | * If device already registered then return base of 1 |
| 607 | * to indicate not to probe for this interface |
| 608 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 609 | if (__dev_get_by_name(&init_net, name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | return 1; |
| 611 | |
| 612 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) |
| 613 | if (!strcmp(name, s[i].name)) |
| 614 | return s[i].map.base_addr; |
| 615 | return 0; |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Saves at boot time configured settings for any netdevice. |
| 620 | */ |
| 621 | int __init netdev_boot_setup(char *str) |
| 622 | { |
| 623 | int ints[5]; |
| 624 | struct ifmap map; |
| 625 | |
| 626 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 627 | if (!str || !*str) |
| 628 | return 0; |
| 629 | |
| 630 | /* Save settings */ |
| 631 | memset(&map, 0, sizeof(map)); |
| 632 | if (ints[0] > 0) |
| 633 | map.irq = ints[1]; |
| 634 | if (ints[0] > 1) |
| 635 | map.base_addr = ints[2]; |
| 636 | if (ints[0] > 2) |
| 637 | map.mem_start = ints[3]; |
| 638 | if (ints[0] > 3) |
| 639 | map.mem_end = ints[4]; |
| 640 | |
| 641 | /* Add new entry to the list */ |
| 642 | return netdev_boot_setup_add(str, &map); |
| 643 | } |
| 644 | |
| 645 | __setup("netdev=", netdev_boot_setup); |
| 646 | |
| 647 | /******************************************************************************* |
| 648 | |
| 649 | Device Interface Subroutines |
| 650 | |
| 651 | *******************************************************************************/ |
| 652 | |
| 653 | /** |
| 654 | * __dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 655 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | * @name: name to find |
| 657 | * |
| 658 | * Find an interface by name. Must be called under RTNL semaphore |
| 659 | * or @dev_base_lock. If the name is found a pointer to the device |
| 660 | * is returned. If the name is not found then %NULL is returned. The |
| 661 | * reference counters are not incremented so the caller must be |
| 662 | * careful with locks. |
| 663 | */ |
| 664 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 665 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 667 | struct net_device *dev; |
| 668 | struct hlist_head *head = dev_name_hash(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 670 | hlist_for_each_entry(dev, head, name_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 672 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | return NULL; |
| 675 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 676 | EXPORT_SYMBOL(__dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | /** |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 679 | * dev_get_by_name_rcu - find a device by its name |
| 680 | * @net: the applicable net namespace |
| 681 | * @name: name to find |
| 682 | * |
| 683 | * Find an interface by name. |
| 684 | * If the name is found a pointer to the device is returned. |
| 685 | * If the name is not found then %NULL is returned. |
| 686 | * The reference counters are not incremented so the caller must be |
| 687 | * careful with locks. The caller must hold RCU lock. |
| 688 | */ |
| 689 | |
| 690 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) |
| 691 | { |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 692 | struct net_device *dev; |
| 693 | struct hlist_head *head = dev_name_hash(net, name); |
| 694 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 695 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 696 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 697 | return dev; |
| 698 | |
| 699 | return NULL; |
| 700 | } |
| 701 | EXPORT_SYMBOL(dev_get_by_name_rcu); |
| 702 | |
| 703 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | * dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 705 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | * @name: name to find |
| 707 | * |
| 708 | * Find an interface by name. This can be called from any |
| 709 | * context and does its own locking. The returned handle has |
| 710 | * the usage count incremented and the caller must use dev_put() to |
| 711 | * release it when it is no longer needed. %NULL is returned if no |
| 712 | * matching device is found. |
| 713 | */ |
| 714 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 715 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | { |
| 717 | struct net_device *dev; |
| 718 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 719 | rcu_read_lock(); |
| 720 | dev = dev_get_by_name_rcu(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | if (dev) |
| 722 | dev_hold(dev); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 723 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return dev; |
| 725 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 726 | EXPORT_SYMBOL(dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
| 728 | /** |
| 729 | * __dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 730 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | * @ifindex: index of device |
| 732 | * |
| 733 | * Search for an interface by index. Returns %NULL if the device |
| 734 | * is not found or a pointer to the device. The device has not |
| 735 | * had its reference counter increased so the caller must be careful |
| 736 | * about locking. The caller must hold either the RTNL semaphore |
| 737 | * or @dev_base_lock. |
| 738 | */ |
| 739 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 740 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 742 | struct net_device *dev; |
| 743 | struct hlist_head *head = dev_index_hash(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 745 | hlist_for_each_entry(dev, head, index_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | if (dev->ifindex == ifindex) |
| 747 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | return NULL; |
| 750 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 751 | EXPORT_SYMBOL(__dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 753 | /** |
| 754 | * dev_get_by_index_rcu - find a device by its ifindex |
| 755 | * @net: the applicable net namespace |
| 756 | * @ifindex: index of device |
| 757 | * |
| 758 | * Search for an interface by index. Returns %NULL if the device |
| 759 | * is not found or a pointer to the device. The device has not |
| 760 | * had its reference counter increased so the caller must be careful |
| 761 | * about locking. The caller must hold RCU lock. |
| 762 | */ |
| 763 | |
| 764 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) |
| 765 | { |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 766 | struct net_device *dev; |
| 767 | struct hlist_head *head = dev_index_hash(net, ifindex); |
| 768 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 769 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 770 | if (dev->ifindex == ifindex) |
| 771 | return dev; |
| 772 | |
| 773 | return NULL; |
| 774 | } |
| 775 | EXPORT_SYMBOL(dev_get_by_index_rcu); |
| 776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
| 778 | /** |
| 779 | * dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 780 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | * @ifindex: index of device |
| 782 | * |
| 783 | * Search for an interface by index. Returns NULL if the device |
| 784 | * is not found or a pointer to the device. The device returned has |
| 785 | * had a reference added and the pointer is safe until the user calls |
| 786 | * dev_put to indicate they have finished with it. |
| 787 | */ |
| 788 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 789 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
| 791 | struct net_device *dev; |
| 792 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 793 | rcu_read_lock(); |
| 794 | dev = dev_get_by_index_rcu(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | if (dev) |
| 796 | dev_hold(dev); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 797 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | return dev; |
| 799 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 800 | EXPORT_SYMBOL(dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
| 802 | /** |
Nicolas Schichan | 5dbe7c1 | 2013-06-26 17:23:42 +0200 | [diff] [blame] | 803 | * netdev_get_name - get a netdevice name, knowing its ifindex. |
| 804 | * @net: network namespace |
| 805 | * @name: a pointer to the buffer where the name will be stored. |
| 806 | * @ifindex: the ifindex of the interface to get the name from. |
| 807 | * |
| 808 | * The use of raw_seqcount_begin() and cond_resched() before |
| 809 | * retrying is required as we want to give the writers a chance |
| 810 | * to complete when CONFIG_PREEMPT is not set. |
| 811 | */ |
| 812 | int netdev_get_name(struct net *net, char *name, int ifindex) |
| 813 | { |
| 814 | struct net_device *dev; |
| 815 | unsigned int seq; |
| 816 | |
| 817 | retry: |
| 818 | seq = raw_seqcount_begin(&devnet_rename_seq); |
| 819 | rcu_read_lock(); |
| 820 | dev = dev_get_by_index_rcu(net, ifindex); |
| 821 | if (!dev) { |
| 822 | rcu_read_unlock(); |
| 823 | return -ENODEV; |
| 824 | } |
| 825 | |
| 826 | strcpy(name, dev->name); |
| 827 | rcu_read_unlock(); |
| 828 | if (read_seqcount_retry(&devnet_rename_seq, seq)) { |
| 829 | cond_resched(); |
| 830 | goto retry; |
| 831 | } |
| 832 | |
| 833 | return 0; |
| 834 | } |
| 835 | |
| 836 | /** |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 837 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 838 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | * @type: media type of device |
| 840 | * @ha: hardware address |
| 841 | * |
| 842 | * Search for an interface by MAC address. Returns NULL if the device |
Eric Dumazet | c506653 | 2011-01-24 13:16:16 -0800 | [diff] [blame] | 843 | * is not found or a pointer to the device. |
| 844 | * The caller must hold RCU or RTNL. |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 845 | * The returned device has not had its ref count increased |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | * and the caller must therefore be careful about locking |
| 847 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | */ |
| 849 | |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 850 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
| 851 | const char *ha) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | { |
| 853 | struct net_device *dev; |
| 854 | |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 855 | for_each_netdev_rcu(net, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | if (dev->type == type && |
| 857 | !memcmp(dev->dev_addr, ha, dev->addr_len)) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 858 | return dev; |
| 859 | |
| 860 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 862 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
Jochen Friedrich | cf309e3 | 2005-09-22 04:44:55 -0300 | [diff] [blame] | 863 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 864 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 865 | { |
| 866 | struct net_device *dev; |
| 867 | |
| 868 | ASSERT_RTNL(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 869 | for_each_netdev(net, dev) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 870 | if (dev->type == type) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 871 | return dev; |
| 872 | |
| 873 | return NULL; |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 874 | } |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 875 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
| 876 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 877 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | { |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 879 | struct net_device *dev, *ret = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 881 | rcu_read_lock(); |
| 882 | for_each_netdev_rcu(net, dev) |
| 883 | if (dev->type == type) { |
| 884 | dev_hold(dev); |
| 885 | ret = dev; |
| 886 | break; |
| 887 | } |
| 888 | rcu_read_unlock(); |
| 889 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
| 892 | |
| 893 | /** |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 894 | * dev_get_by_flags_rcu - find any device with given flags |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 895 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | * @if_flags: IFF_* values |
| 897 | * @mask: bitmask of bits in if_flags to check |
| 898 | * |
| 899 | * Search for any interface with the given flags. Returns NULL if a device |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 900 | * is not found or a pointer to the device. Must be called inside |
| 901 | * rcu_read_lock(), and result refcount is unchanged. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | */ |
| 903 | |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 904 | struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags, |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 905 | unsigned short mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 907 | struct net_device *dev, *ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 909 | ret = NULL; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 910 | for_each_netdev_rcu(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | if (((dev->flags ^ if_flags) & mask) == 0) { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 912 | ret = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | break; |
| 914 | } |
| 915 | } |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 916 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | } |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 918 | EXPORT_SYMBOL(dev_get_by_flags_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
| 920 | /** |
| 921 | * dev_valid_name - check if name is okay for network device |
| 922 | * @name: name string |
| 923 | * |
| 924 | * Network device names need to be valid file names to |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 925 | * to allow sysfs to work. We also disallow any kind of |
| 926 | * whitespace. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | */ |
David S. Miller | 95f050b | 2012-03-06 16:12:15 -0500 | [diff] [blame] | 928 | bool dev_valid_name(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | { |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 930 | if (*name == '\0') |
David S. Miller | 95f050b | 2012-03-06 16:12:15 -0500 | [diff] [blame] | 931 | return false; |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 932 | if (strlen(name) >= IFNAMSIZ) |
David S. Miller | 95f050b | 2012-03-06 16:12:15 -0500 | [diff] [blame] | 933 | return false; |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 934 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
David S. Miller | 95f050b | 2012-03-06 16:12:15 -0500 | [diff] [blame] | 935 | return false; |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 936 | |
| 937 | while (*name) { |
| 938 | if (*name == '/' || isspace(*name)) |
David S. Miller | 95f050b | 2012-03-06 16:12:15 -0500 | [diff] [blame] | 939 | return false; |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 940 | name++; |
| 941 | } |
David S. Miller | 95f050b | 2012-03-06 16:12:15 -0500 | [diff] [blame] | 942 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 944 | EXPORT_SYMBOL(dev_valid_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
| 946 | /** |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 947 | * __dev_alloc_name - allocate a name for a device |
| 948 | * @net: network namespace to allocate the device name in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | * @name: name format string |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 950 | * @buf: scratch buffer and result name string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | * |
| 952 | * Passed a format string - eg "lt%d" it will try and find a suitable |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 953 | * id. It scans list of devices to build up a free map, then chooses |
| 954 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 955 | * while allocating the name and adding the device in order to avoid |
| 956 | * duplicates. |
| 957 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 958 | * Returns the number of the unit assigned or a negative errno code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | */ |
| 960 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 961 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | { |
| 963 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | const char *p; |
| 965 | const int max_netdevices = 8*PAGE_SIZE; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 966 | unsigned long *inuse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | struct net_device *d; |
| 968 | |
| 969 | p = strnchr(name, IFNAMSIZ-1, '%'); |
| 970 | if (p) { |
| 971 | /* |
| 972 | * Verify the string as this thing may have come from |
| 973 | * the user. There must be either one "%d" and no other "%" |
| 974 | * characters. |
| 975 | */ |
| 976 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 977 | return -EINVAL; |
| 978 | |
| 979 | /* Use one page as a bit array of possible slots */ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 980 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | if (!inuse) |
| 982 | return -ENOMEM; |
| 983 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 984 | for_each_netdev(net, d) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | if (!sscanf(d->name, name, &i)) |
| 986 | continue; |
| 987 | if (i < 0 || i >= max_netdevices) |
| 988 | continue; |
| 989 | |
| 990 | /* avoid cases where sscanf is not exact inverse of printf */ |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 991 | snprintf(buf, IFNAMSIZ, name, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
| 993 | set_bit(i, inuse); |
| 994 | } |
| 995 | |
| 996 | i = find_first_zero_bit(inuse, max_netdevices); |
| 997 | free_page((unsigned long) inuse); |
| 998 | } |
| 999 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1000 | if (buf != name) |
| 1001 | snprintf(buf, IFNAMSIZ, name, i); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 1002 | if (!__dev_get_by_name(net, buf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
| 1005 | /* It is possible to run out of possible slots |
| 1006 | * when the name is long and there isn't enough space left |
| 1007 | * for the digits, or if all bits are used. |
| 1008 | */ |
| 1009 | return -ENFILE; |
| 1010 | } |
| 1011 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 1012 | /** |
| 1013 | * dev_alloc_name - allocate a name for a device |
| 1014 | * @dev: device |
| 1015 | * @name: name format string |
| 1016 | * |
| 1017 | * Passed a format string - eg "lt%d" it will try and find a suitable |
| 1018 | * id. It scans list of devices to build up a free map, then chooses |
| 1019 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 1020 | * while allocating the name and adding the device in order to avoid |
| 1021 | * duplicates. |
| 1022 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 1023 | * Returns the number of the unit assigned or a negative errno code. |
| 1024 | */ |
| 1025 | |
| 1026 | int dev_alloc_name(struct net_device *dev, const char *name) |
| 1027 | { |
| 1028 | char buf[IFNAMSIZ]; |
| 1029 | struct net *net; |
| 1030 | int ret; |
| 1031 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1032 | BUG_ON(!dev_net(dev)); |
| 1033 | net = dev_net(dev); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 1034 | ret = __dev_alloc_name(net, name, buf); |
| 1035 | if (ret >= 0) |
| 1036 | strlcpy(dev->name, buf, IFNAMSIZ); |
| 1037 | return ret; |
| 1038 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1039 | EXPORT_SYMBOL(dev_alloc_name); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 1040 | |
Gao feng | 828de4f | 2012-09-13 20:58:27 +0000 | [diff] [blame] | 1041 | static int dev_alloc_name_ns(struct net *net, |
| 1042 | struct net_device *dev, |
| 1043 | const char *name) |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1044 | { |
Gao feng | 828de4f | 2012-09-13 20:58:27 +0000 | [diff] [blame] | 1045 | char buf[IFNAMSIZ]; |
| 1046 | int ret; |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 1047 | |
Gao feng | 828de4f | 2012-09-13 20:58:27 +0000 | [diff] [blame] | 1048 | ret = __dev_alloc_name(net, name, buf); |
| 1049 | if (ret >= 0) |
| 1050 | strlcpy(dev->name, buf, IFNAMSIZ); |
| 1051 | return ret; |
| 1052 | } |
| 1053 | |
| 1054 | static int dev_get_valid_name(struct net *net, |
| 1055 | struct net_device *dev, |
| 1056 | const char *name) |
| 1057 | { |
| 1058 | BUG_ON(!net); |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 1059 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1060 | if (!dev_valid_name(name)) |
| 1061 | return -EINVAL; |
| 1062 | |
Jiri Pirko | 1c5cae8 | 2011-04-30 01:21:32 +0000 | [diff] [blame] | 1063 | if (strchr(name, '%')) |
Gao feng | 828de4f | 2012-09-13 20:58:27 +0000 | [diff] [blame] | 1064 | return dev_alloc_name_ns(net, dev, name); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1065 | else if (__dev_get_by_name(net, name)) |
| 1066 | return -EEXIST; |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 1067 | else if (dev->name != name) |
| 1068 | strlcpy(dev->name, name, IFNAMSIZ); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1069 | |
| 1070 | return 0; |
| 1071 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
| 1073 | /** |
| 1074 | * dev_change_name - change name of a device |
| 1075 | * @dev: device |
| 1076 | * @newname: name (or format string) must be at least IFNAMSIZ |
| 1077 | * |
| 1078 | * Change name of a device, can pass format strings "eth%d". |
| 1079 | * for wildcarding. |
| 1080 | */ |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 1081 | int dev_change_name(struct net_device *dev, const char *newname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1083 | char oldname[IFNAMSIZ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | int err = 0; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1085 | int ret; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1086 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
| 1088 | ASSERT_RTNL(); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1089 | BUG_ON(!dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1091 | net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | if (dev->flags & IFF_UP) |
| 1093 | return -EBUSY; |
| 1094 | |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 1095 | write_seqcount_begin(&devnet_rename_seq); |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1096 | |
| 1097 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 1098 | write_seqcount_end(&devnet_rename_seq); |
Stephen Hemminger | c8d90dc | 2007-10-26 03:53:42 -0700 | [diff] [blame] | 1099 | return 0; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1100 | } |
Stephen Hemminger | c8d90dc | 2007-10-26 03:53:42 -0700 | [diff] [blame] | 1101 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1102 | memcpy(oldname, dev->name, IFNAMSIZ); |
| 1103 | |
Gao feng | 828de4f | 2012-09-13 20:58:27 +0000 | [diff] [blame] | 1104 | err = dev_get_valid_name(net, dev, newname); |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1105 | if (err < 0) { |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 1106 | write_seqcount_end(&devnet_rename_seq); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1107 | return err; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1108 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1110 | rollback: |
Eric W. Biederman | a1b3f59 | 2010-05-04 17:36:49 -0700 | [diff] [blame] | 1111 | ret = device_rename(&dev->dev, dev->name); |
| 1112 | if (ret) { |
| 1113 | memcpy(dev->name, oldname, IFNAMSIZ); |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 1114 | write_seqcount_end(&devnet_rename_seq); |
Eric W. Biederman | a1b3f59 | 2010-05-04 17:36:49 -0700 | [diff] [blame] | 1115 | return ret; |
Stephen Hemminger | dcc9977 | 2008-05-14 22:33:38 -0700 | [diff] [blame] | 1116 | } |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 1117 | |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 1118 | write_seqcount_end(&devnet_rename_seq); |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1119 | |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 1120 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | 372b231 | 2011-05-17 13:56:59 -0400 | [diff] [blame] | 1121 | hlist_del_rcu(&dev->name_hlist); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1122 | write_unlock_bh(&dev_base_lock); |
| 1123 | |
| 1124 | synchronize_rcu(); |
| 1125 | |
| 1126 | write_lock_bh(&dev_base_lock); |
| 1127 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 1128 | write_unlock_bh(&dev_base_lock); |
| 1129 | |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1130 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1131 | ret = notifier_to_errno(ret); |
| 1132 | |
| 1133 | if (ret) { |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1134 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
| 1135 | if (err >= 0) { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1136 | err = ret; |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 1137 | write_seqcount_begin(&devnet_rename_seq); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1138 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1139 | goto rollback; |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1140 | } else { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 1141 | pr_err("%s: name change rollback failed: %d\n", |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1142 | dev->name, ret); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1143 | } |
| 1144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
| 1146 | return err; |
| 1147 | } |
| 1148 | |
| 1149 | /** |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1150 | * dev_set_alias - change ifalias of a device |
| 1151 | * @dev: device |
| 1152 | * @alias: name up to IFALIASZ |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 1153 | * @len: limit of bytes to copy from info |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1154 | * |
| 1155 | * Set ifalias for a device, |
| 1156 | */ |
| 1157 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) |
| 1158 | { |
Alexey Khoroshilov | 7364e44 | 2012-08-08 00:33:25 +0000 | [diff] [blame] | 1159 | char *new_ifalias; |
| 1160 | |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1161 | ASSERT_RTNL(); |
| 1162 | |
| 1163 | if (len >= IFALIASZ) |
| 1164 | return -EINVAL; |
| 1165 | |
Oliver Hartkopp | 96ca4a2 | 2008-09-23 21:23:19 -0700 | [diff] [blame] | 1166 | if (!len) { |
Sachin Kamat | 388dfc2 | 2012-11-20 00:57:04 +0000 | [diff] [blame] | 1167 | kfree(dev->ifalias); |
| 1168 | dev->ifalias = NULL; |
Oliver Hartkopp | 96ca4a2 | 2008-09-23 21:23:19 -0700 | [diff] [blame] | 1169 | return 0; |
| 1170 | } |
| 1171 | |
Alexey Khoroshilov | 7364e44 | 2012-08-08 00:33:25 +0000 | [diff] [blame] | 1172 | new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
| 1173 | if (!new_ifalias) |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1174 | return -ENOMEM; |
Alexey Khoroshilov | 7364e44 | 2012-08-08 00:33:25 +0000 | [diff] [blame] | 1175 | dev->ifalias = new_ifalias; |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1176 | |
| 1177 | strlcpy(dev->ifalias, alias, len+1); |
| 1178 | return len; |
| 1179 | } |
| 1180 | |
| 1181 | |
| 1182 | /** |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 1183 | * netdev_features_change - device changes features |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1184 | * @dev: device to cause notification |
| 1185 | * |
| 1186 | * Called to indicate a device has changed features. |
| 1187 | */ |
| 1188 | void netdev_features_change(struct net_device *dev) |
| 1189 | { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1190 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1191 | } |
| 1192 | EXPORT_SYMBOL(netdev_features_change); |
| 1193 | |
| 1194 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | * netdev_state_change - device changes state |
| 1196 | * @dev: device to cause notification |
| 1197 | * |
| 1198 | * Called to indicate a device has changed state. This function calls |
| 1199 | * the notifier chains for netdev_chain and sends a NEWLINK message |
| 1200 | * to the routing socket. |
| 1201 | */ |
| 1202 | void netdev_state_change(struct net_device *dev) |
| 1203 | { |
| 1204 | if (dev->flags & IFF_UP) { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1205 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
| 1207 | } |
| 1208 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1209 | EXPORT_SYMBOL(netdev_state_change); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
Amerigo Wang | ee89bab | 2012-08-09 22:14:56 +0000 | [diff] [blame] | 1211 | /** |
| 1212 | * netdev_notify_peers - notify network peers about existence of @dev |
| 1213 | * @dev: network device |
| 1214 | * |
| 1215 | * Generate traffic such that interested network peers are aware of |
| 1216 | * @dev, such as by generating a gratuitous ARP. This may be used when |
| 1217 | * a device wants to inform the rest of the network about some sort of |
| 1218 | * reconfiguration such as a failover event or virtual machine |
| 1219 | * migration. |
| 1220 | */ |
| 1221 | void netdev_notify_peers(struct net_device *dev) |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1222 | { |
Amerigo Wang | ee89bab | 2012-08-09 22:14:56 +0000 | [diff] [blame] | 1223 | rtnl_lock(); |
| 1224 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); |
| 1225 | rtnl_unlock(); |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1226 | } |
Amerigo Wang | ee89bab | 2012-08-09 22:14:56 +0000 | [diff] [blame] | 1227 | EXPORT_SYMBOL(netdev_notify_peers); |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1228 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1229 | static int __dev_open(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1231 | const struct net_device_ops *ops = dev->netdev_ops; |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1232 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1234 | ASSERT_RTNL(); |
| 1235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | if (!netif_device_present(dev)) |
| 1237 | return -ENODEV; |
| 1238 | |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1239 | /* Block netpoll from trying to do any rx path servicing. |
| 1240 | * If we don't do this there is a chance ndo_poll_controller |
| 1241 | * or ndo_poll may be running while we open the device |
| 1242 | */ |
dingtianhong | da6e378 | 2013-05-27 19:53:31 +0000 | [diff] [blame] | 1243 | netpoll_rx_disable(dev); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1244 | |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1245 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
| 1246 | ret = notifier_to_errno(ret); |
| 1247 | if (ret) |
| 1248 | return ret; |
| 1249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | set_bit(__LINK_STATE_START, &dev->state); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1251 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1252 | if (ops->ndo_validate_addr) |
| 1253 | ret = ops->ndo_validate_addr(dev); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1254 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1255 | if (!ret && ops->ndo_open) |
| 1256 | ret = ops->ndo_open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1258 | netpoll_rx_enable(dev); |
| 1259 | |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1260 | if (ret) |
| 1261 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1262 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | dev->flags |= IFF_UP; |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1264 | net_dmaengine_get(); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 1265 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | dev_activate(dev); |
Theodore Ts'o | 7bf2357 | 2012-07-04 21:23:25 -0400 | [diff] [blame] | 1267 | add_device_randomness(dev->dev_addr, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | return ret; |
| 1271 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1272 | |
| 1273 | /** |
| 1274 | * dev_open - prepare an interface for use. |
| 1275 | * @dev: device to open |
| 1276 | * |
| 1277 | * Takes a device from down to up state. The device's private open |
| 1278 | * function is invoked and then the multicast lists are loaded. Finally |
| 1279 | * the device is moved into the up state and a %NETDEV_UP message is |
| 1280 | * sent to the netdev notifier chain. |
| 1281 | * |
| 1282 | * Calling this function on an active interface is a nop. On a failure |
| 1283 | * a negative errno code is returned. |
| 1284 | */ |
| 1285 | int dev_open(struct net_device *dev) |
| 1286 | { |
| 1287 | int ret; |
| 1288 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1289 | if (dev->flags & IFF_UP) |
| 1290 | return 0; |
| 1291 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1292 | ret = __dev_open(dev); |
| 1293 | if (ret < 0) |
| 1294 | return ret; |
| 1295 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1296 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1297 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 1298 | |
| 1299 | return ret; |
| 1300 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1301 | EXPORT_SYMBOL(dev_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1303 | static int __dev_close_many(struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1305 | struct net_device *dev; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1306 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1307 | ASSERT_RTNL(); |
David S. Miller | 9d5010d | 2007-09-12 14:33:25 +0200 | [diff] [blame] | 1308 | might_sleep(); |
| 1309 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1310 | list_for_each_entry(dev, head, unreg_list) { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1311 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1313 | clear_bit(__LINK_STATE_START, &dev->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1315 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
| 1316 | * can be even on different cpu. So just clear netif_running(). |
| 1317 | * |
| 1318 | * dev->stop() will invoke napi_disable() on all of it's |
| 1319 | * napi_struct instances on this device. |
| 1320 | */ |
| 1321 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ |
| 1322 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1324 | dev_deactivate_many(head); |
| 1325 | |
| 1326 | list_for_each_entry(dev, head, unreg_list) { |
| 1327 | const struct net_device_ops *ops = dev->netdev_ops; |
| 1328 | |
| 1329 | /* |
| 1330 | * Call the device specific close. This cannot fail. |
| 1331 | * Only if device is UP |
| 1332 | * |
| 1333 | * We allow it to be called even after a DETACH hot-plug |
| 1334 | * event. |
| 1335 | */ |
| 1336 | if (ops->ndo_stop) |
| 1337 | ops->ndo_stop(dev); |
| 1338 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1339 | dev->flags &= ~IFF_UP; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1340 | net_dmaengine_put(); |
| 1341 | } |
| 1342 | |
| 1343 | return 0; |
| 1344 | } |
| 1345 | |
| 1346 | static int __dev_close(struct net_device *dev) |
| 1347 | { |
Linus Torvalds | f87e6f4 | 2011-02-17 22:54:38 +0000 | [diff] [blame] | 1348 | int retval; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1349 | LIST_HEAD(single); |
| 1350 | |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1351 | /* Temporarily disable netpoll until the interface is down */ |
dingtianhong | da6e378 | 2013-05-27 19:53:31 +0000 | [diff] [blame] | 1352 | netpoll_rx_disable(dev); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1353 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1354 | list_add(&dev->unreg_list, &single); |
Linus Torvalds | f87e6f4 | 2011-02-17 22:54:38 +0000 | [diff] [blame] | 1355 | retval = __dev_close_many(&single); |
| 1356 | list_del(&single); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1357 | |
| 1358 | netpoll_rx_enable(dev); |
Linus Torvalds | f87e6f4 | 2011-02-17 22:54:38 +0000 | [diff] [blame] | 1359 | return retval; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1360 | } |
| 1361 | |
Eric Dumazet | 3fbd875 | 2011-01-19 21:23:22 +0000 | [diff] [blame] | 1362 | static int dev_close_many(struct list_head *head) |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1363 | { |
| 1364 | struct net_device *dev, *tmp; |
| 1365 | LIST_HEAD(tmp_list); |
| 1366 | |
| 1367 | list_for_each_entry_safe(dev, tmp, head, unreg_list) |
| 1368 | if (!(dev->flags & IFF_UP)) |
| 1369 | list_move(&dev->unreg_list, &tmp_list); |
| 1370 | |
| 1371 | __dev_close_many(head); |
Matti Linnanvuori | d8b2a4d | 2008-02-12 23:10:11 -0800 | [diff] [blame] | 1372 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1373 | list_for_each_entry(dev, head, unreg_list) { |
| 1374 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1375 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 1376 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1378 | /* rollback_registered_many needs the complete original list */ |
| 1379 | list_splice(&tmp_list, head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | return 0; |
| 1381 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1382 | |
| 1383 | /** |
| 1384 | * dev_close - shutdown an interface. |
| 1385 | * @dev: device to shutdown |
| 1386 | * |
| 1387 | * This function moves an active device into down state. A |
| 1388 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device |
| 1389 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier |
| 1390 | * chain. |
| 1391 | */ |
| 1392 | int dev_close(struct net_device *dev) |
| 1393 | { |
Eric Dumazet | e14a599 | 2011-05-10 12:26:06 -0700 | [diff] [blame] | 1394 | if (dev->flags & IFF_UP) { |
| 1395 | LIST_HEAD(single); |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1396 | |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1397 | /* Block netpoll rx while the interface is going down */ |
dingtianhong | da6e378 | 2013-05-27 19:53:31 +0000 | [diff] [blame] | 1398 | netpoll_rx_disable(dev); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1399 | |
Eric Dumazet | e14a599 | 2011-05-10 12:26:06 -0700 | [diff] [blame] | 1400 | list_add(&dev->unreg_list, &single); |
| 1401 | dev_close_many(&single); |
| 1402 | list_del(&single); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 1403 | |
| 1404 | netpoll_rx_enable(dev); |
Eric Dumazet | e14a599 | 2011-05-10 12:26:06 -0700 | [diff] [blame] | 1405 | } |
dingtianhong | da6e378 | 2013-05-27 19:53:31 +0000 | [diff] [blame] | 1406 | return 0; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1407 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1408 | EXPORT_SYMBOL(dev_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | |
| 1410 | |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1411 | /** |
| 1412 | * dev_disable_lro - disable Large Receive Offload on a device |
| 1413 | * @dev: device |
| 1414 | * |
| 1415 | * Disable Large Receive Offload (LRO) on a net device. Must be |
| 1416 | * called under RTNL. This is needed if received packets may be |
| 1417 | * forwarded to another interface. |
| 1418 | */ |
| 1419 | void dev_disable_lro(struct net_device *dev) |
| 1420 | { |
Neil Horman | f11970e | 2011-05-24 08:31:09 +0000 | [diff] [blame] | 1421 | /* |
| 1422 | * If we're trying to disable lro on a vlan device |
| 1423 | * use the underlying physical device instead |
| 1424 | */ |
| 1425 | if (is_vlan_dev(dev)) |
| 1426 | dev = vlan_dev_real_dev(dev); |
| 1427 | |
Michał Mirosław | bc5787c6 | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1428 | dev->wanted_features &= ~NETIF_F_LRO; |
| 1429 | netdev_update_features(dev); |
Michał Mirosław | 2766051 | 2011-03-18 16:56:34 +0000 | [diff] [blame] | 1430 | |
Michał Mirosław | 22d5969 | 2011-04-21 12:42:15 +0000 | [diff] [blame] | 1431 | if (unlikely(dev->features & NETIF_F_LRO)) |
| 1432 | netdev_WARN(dev, "failed to disable LRO!\n"); |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1433 | } |
| 1434 | EXPORT_SYMBOL(dev_disable_lro); |
| 1435 | |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1436 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
| 1437 | struct net_device *dev) |
| 1438 | { |
| 1439 | struct netdev_notifier_info info; |
| 1440 | |
| 1441 | netdev_notifier_info_init(&info, dev); |
| 1442 | return nb->notifier_call(nb, val, &info); |
| 1443 | } |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1444 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1445 | static int dev_boot_phase = 1; |
| 1446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | /** |
| 1448 | * register_netdevice_notifier - register a network notifier block |
| 1449 | * @nb: notifier |
| 1450 | * |
| 1451 | * Register a notifier to be called when network device events occur. |
| 1452 | * The notifier passed is linked into the kernel structures and must |
| 1453 | * not be reused until it has been unregistered. A negative errno code |
| 1454 | * is returned on a failure. |
| 1455 | * |
| 1456 | * When registered all registration and up events are replayed |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1457 | * to the new notifier to allow device to have a race free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | * view of the network device list. |
| 1459 | */ |
| 1460 | |
| 1461 | int register_netdevice_notifier(struct notifier_block *nb) |
| 1462 | { |
| 1463 | struct net_device *dev; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1464 | struct net_device *last; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1465 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | int err; |
| 1467 | |
| 1468 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1469 | err = raw_notifier_chain_register(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1470 | if (err) |
| 1471 | goto unlock; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1472 | if (dev_boot_phase) |
| 1473 | goto unlock; |
| 1474 | for_each_net(net) { |
| 1475 | for_each_netdev(net, dev) { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1476 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1477 | err = notifier_to_errno(err); |
| 1478 | if (err) |
| 1479 | goto rollback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1481 | if (!(dev->flags & IFF_UP)) |
| 1482 | continue; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1483 | |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1484 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1485 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1487 | |
| 1488 | unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | rtnl_unlock(); |
| 1490 | return err; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1491 | |
| 1492 | rollback: |
| 1493 | last = dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1494 | for_each_net(net) { |
| 1495 | for_each_netdev(net, dev) { |
| 1496 | if (dev == last) |
RongQing.Li | 8f89148 | 2011-11-30 23:43:07 -0500 | [diff] [blame] | 1497 | goto outroll; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1498 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1499 | if (dev->flags & IFF_UP) { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1500 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
| 1501 | dev); |
| 1502 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1503 | } |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1504 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1505 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1506 | } |
Pavel Emelyanov | c67625a | 2007-11-14 15:53:16 -0800 | [diff] [blame] | 1507 | |
RongQing.Li | 8f89148 | 2011-11-30 23:43:07 -0500 | [diff] [blame] | 1508 | outroll: |
Pavel Emelyanov | c67625a | 2007-11-14 15:53:16 -0800 | [diff] [blame] | 1509 | raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1510 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1512 | EXPORT_SYMBOL(register_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | |
| 1514 | /** |
| 1515 | * unregister_netdevice_notifier - unregister a network notifier block |
| 1516 | * @nb: notifier |
| 1517 | * |
| 1518 | * Unregister a notifier previously registered by |
| 1519 | * register_netdevice_notifier(). The notifier is unlinked into the |
| 1520 | * kernel structures and may then be reused. A negative errno code |
| 1521 | * is returned on a failure. |
Eric W. Biederman | 7d3d43d | 2012-04-06 15:33:35 +0000 | [diff] [blame] | 1522 | * |
| 1523 | * After unregistering unregister and down device events are synthesized |
| 1524 | * for all devices on the device list to the removed notifier to remove |
| 1525 | * the need for special case cleanup code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | */ |
| 1527 | |
| 1528 | int unregister_netdevice_notifier(struct notifier_block *nb) |
| 1529 | { |
Eric W. Biederman | 7d3d43d | 2012-04-06 15:33:35 +0000 | [diff] [blame] | 1530 | struct net_device *dev; |
| 1531 | struct net *net; |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1532 | int err; |
| 1533 | |
| 1534 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1535 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
Eric W. Biederman | 7d3d43d | 2012-04-06 15:33:35 +0000 | [diff] [blame] | 1536 | if (err) |
| 1537 | goto unlock; |
| 1538 | |
| 1539 | for_each_net(net) { |
| 1540 | for_each_netdev(net, dev) { |
| 1541 | if (dev->flags & IFF_UP) { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1542 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
| 1543 | dev); |
| 1544 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); |
Eric W. Biederman | 7d3d43d | 2012-04-06 15:33:35 +0000 | [diff] [blame] | 1545 | } |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1546 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
Eric W. Biederman | 7d3d43d | 2012-04-06 15:33:35 +0000 | [diff] [blame] | 1547 | } |
| 1548 | } |
| 1549 | unlock: |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1550 | rtnl_unlock(); |
| 1551 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1553 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | |
| 1555 | /** |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1556 | * call_netdevice_notifiers_info - call all network notifier blocks |
| 1557 | * @val: value passed unmodified to notifier function |
| 1558 | * @dev: net_device pointer passed unmodified to notifier function |
| 1559 | * @info: notifier information data |
| 1560 | * |
| 1561 | * Call all network notifier blocks. Parameters and return value |
| 1562 | * are as for raw_notifier_call_chain(). |
| 1563 | */ |
| 1564 | |
| 1565 | int call_netdevice_notifiers_info(unsigned long val, struct net_device *dev, |
| 1566 | struct netdev_notifier_info *info) |
| 1567 | { |
| 1568 | ASSERT_RTNL(); |
| 1569 | netdev_notifier_info_init(info, dev); |
| 1570 | return raw_notifier_call_chain(&netdev_chain, val, info); |
| 1571 | } |
| 1572 | EXPORT_SYMBOL(call_netdevice_notifiers_info); |
| 1573 | |
| 1574 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | * call_netdevice_notifiers - call all network notifier blocks |
| 1576 | * @val: value passed unmodified to notifier function |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1577 | * @dev: net_device pointer passed unmodified to notifier function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | * |
| 1579 | * Call all network notifier blocks. Parameters and return value |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1580 | * are as for raw_notifier_call_chain(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | */ |
| 1582 | |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1583 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1585 | struct netdev_notifier_info info; |
| 1586 | |
| 1587 | return call_netdevice_notifiers_info(val, dev, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | } |
stephen hemminger | edf947f | 2011-03-24 13:24:01 +0000 | [diff] [blame] | 1589 | EXPORT_SYMBOL(call_netdevice_notifiers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1591 | static struct static_key netstamp_needed __read_mostly; |
Eric Dumazet | b90e579 | 2011-11-28 11:16:50 +0000 | [diff] [blame] | 1592 | #ifdef HAVE_JUMP_LABEL |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1593 | /* We are not allowed to call static_key_slow_dec() from irq context |
Eric Dumazet | b90e579 | 2011-11-28 11:16:50 +0000 | [diff] [blame] | 1594 | * If net_disable_timestamp() is called from irq context, defer the |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1595 | * static_key_slow_dec() calls. |
Eric Dumazet | b90e579 | 2011-11-28 11:16:50 +0000 | [diff] [blame] | 1596 | */ |
| 1597 | static atomic_t netstamp_needed_deferred; |
| 1598 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
| 1600 | void net_enable_timestamp(void) |
| 1601 | { |
Eric Dumazet | b90e579 | 2011-11-28 11:16:50 +0000 | [diff] [blame] | 1602 | #ifdef HAVE_JUMP_LABEL |
| 1603 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
| 1604 | |
| 1605 | if (deferred) { |
| 1606 | while (--deferred) |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1607 | static_key_slow_dec(&netstamp_needed); |
Eric Dumazet | b90e579 | 2011-11-28 11:16:50 +0000 | [diff] [blame] | 1608 | return; |
| 1609 | } |
| 1610 | #endif |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1611 | static_key_slow_inc(&netstamp_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1613 | EXPORT_SYMBOL(net_enable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | |
| 1615 | void net_disable_timestamp(void) |
| 1616 | { |
Eric Dumazet | b90e579 | 2011-11-28 11:16:50 +0000 | [diff] [blame] | 1617 | #ifdef HAVE_JUMP_LABEL |
| 1618 | if (in_interrupt()) { |
| 1619 | atomic_inc(&netstamp_needed_deferred); |
| 1620 | return; |
| 1621 | } |
| 1622 | #endif |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1623 | static_key_slow_dec(&netstamp_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1625 | EXPORT_SYMBOL(net_disable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1627 | static inline void net_timestamp_set(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | { |
Eric Dumazet | 588f033 | 2011-11-15 04:12:55 +0000 | [diff] [blame] | 1629 | skb->tstamp.tv64 = 0; |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1630 | if (static_key_false(&netstamp_needed)) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1631 | __net_timestamp(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | } |
| 1633 | |
Eric Dumazet | 588f033 | 2011-11-15 04:12:55 +0000 | [diff] [blame] | 1634 | #define net_timestamp_check(COND, SKB) \ |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 1635 | if (static_key_false(&netstamp_needed)) { \ |
Eric Dumazet | 588f033 | 2011-11-15 04:12:55 +0000 | [diff] [blame] | 1636 | if ((COND) && !(SKB)->tstamp.tv64) \ |
| 1637 | __net_timestamp(SKB); \ |
| 1638 | } \ |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1639 | |
Daniel Lezcano | 79b569f | 2011-03-30 02:42:17 -0700 | [diff] [blame] | 1640 | static inline bool is_skb_forwardable(struct net_device *dev, |
| 1641 | struct sk_buff *skb) |
| 1642 | { |
| 1643 | unsigned int len; |
| 1644 | |
| 1645 | if (!(dev->flags & IFF_UP)) |
| 1646 | return false; |
| 1647 | |
| 1648 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; |
| 1649 | if (skb->len <= len) |
| 1650 | return true; |
| 1651 | |
| 1652 | /* if TSO is enabled, we don't care about the length as the packet |
| 1653 | * could be forwarded without being segmented before |
| 1654 | */ |
| 1655 | if (skb_is_gso(skb)) |
| 1656 | return true; |
| 1657 | |
| 1658 | return false; |
| 1659 | } |
| 1660 | |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1661 | /** |
| 1662 | * dev_forward_skb - loopback an skb to another netif |
| 1663 | * |
| 1664 | * @dev: destination network device |
| 1665 | * @skb: buffer to forward |
| 1666 | * |
| 1667 | * return values: |
| 1668 | * NET_RX_SUCCESS (no congestion) |
Eric Dumazet | 6ec8256 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1669 | * NET_RX_DROP (packet was dropped, but freed) |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1670 | * |
| 1671 | * dev_forward_skb can be used for injecting an skb from the |
| 1672 | * start_xmit function of one device into the receive queue |
| 1673 | * of another device. |
| 1674 | * |
| 1675 | * The receiving device may be in another namespace, so |
| 1676 | * we have to clear all information in the skb that could |
| 1677 | * impact namespace isolation. |
| 1678 | */ |
| 1679 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
| 1680 | { |
Michael S. Tsirkin | 48c8301 | 2011-08-31 08:03:29 +0000 | [diff] [blame] | 1681 | if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { |
| 1682 | if (skb_copy_ubufs(skb, GFP_ATOMIC)) { |
| 1683 | atomic_long_inc(&dev->rx_dropped); |
| 1684 | kfree_skb(skb); |
| 1685 | return NET_RX_DROP; |
| 1686 | } |
| 1687 | } |
| 1688 | |
Daniel Lezcano | 79b569f | 2011-03-30 02:42:17 -0700 | [diff] [blame] | 1689 | if (unlikely(!is_skb_forwardable(dev, skb))) { |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 1690 | atomic_long_inc(&dev->rx_dropped); |
Eric Dumazet | 6ec8256 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1691 | kfree_skb(skb); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1692 | return NET_RX_DROP; |
Eric Dumazet | 6ec8256 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1693 | } |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1694 | skb->protocol = eth_type_trans(skb, dev); |
Isaku Yamahata | 06a23fe | 2013-07-02 20:30:10 +0900 | [diff] [blame] | 1695 | |
| 1696 | /* eth_type_trans() can set pkt_type. |
Nicolas Dichtel | 64261f2 | 2013-08-13 17:51:09 +0200 | [diff] [blame] | 1697 | * call skb_scrub_packet() after it to clear pkt_type _after_ calling |
| 1698 | * eth_type_trans(). |
Isaku Yamahata | 06a23fe | 2013-07-02 20:30:10 +0900 | [diff] [blame] | 1699 | */ |
Nicolas Dichtel | 64261f2 | 2013-08-13 17:51:09 +0200 | [diff] [blame] | 1700 | skb_scrub_packet(skb); |
Isaku Yamahata | 06a23fe | 2013-07-02 20:30:10 +0900 | [diff] [blame] | 1701 | |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1702 | return netif_rx(skb); |
| 1703 | } |
| 1704 | EXPORT_SYMBOL_GPL(dev_forward_skb); |
| 1705 | |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1706 | static inline int deliver_skb(struct sk_buff *skb, |
| 1707 | struct packet_type *pt_prev, |
| 1708 | struct net_device *orig_dev) |
| 1709 | { |
Michael S. Tsirkin | 1080e51 | 2012-07-20 09:23:17 +0000 | [diff] [blame] | 1710 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
| 1711 | return -ENOMEM; |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1712 | atomic_inc(&skb->users); |
| 1713 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
| 1714 | } |
| 1715 | |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1716 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
| 1717 | { |
Eric Leblond | a3d744e | 2012-11-06 02:10:10 +0000 | [diff] [blame] | 1718 | if (!ptype->af_packet_priv || !skb->sk) |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1719 | return false; |
| 1720 | |
| 1721 | if (ptype->id_match) |
| 1722 | return ptype->id_match(ptype, skb->sk); |
| 1723 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) |
| 1724 | return true; |
| 1725 | |
| 1726 | return false; |
| 1727 | } |
| 1728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | /* |
| 1730 | * Support routine. Sends outgoing frames to any network |
| 1731 | * taps currently in use. |
| 1732 | */ |
| 1733 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1734 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | { |
| 1736 | struct packet_type *ptype; |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1737 | struct sk_buff *skb2 = NULL; |
| 1738 | struct packet_type *pt_prev = NULL; |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | rcu_read_lock(); |
| 1741 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 1742 | /* Never send packets back to the socket |
| 1743 | * they originated from - MvS (miquels@drinkel.ow.org) |
| 1744 | */ |
| 1745 | if ((ptype->dev == dev || !ptype->dev) && |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1746 | (!skb_loop_sk(ptype, skb))) { |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1747 | if (pt_prev) { |
| 1748 | deliver_skb(skb2, pt_prev, skb->dev); |
| 1749 | pt_prev = ptype; |
| 1750 | continue; |
| 1751 | } |
| 1752 | |
| 1753 | skb2 = skb_clone(skb, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | if (!skb2) |
| 1755 | break; |
| 1756 | |
Eric Dumazet | 7097818 | 2010-12-20 21:22:51 +0000 | [diff] [blame] | 1757 | net_timestamp_set(skb2); |
| 1758 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | /* skb->nh should be correctly |
| 1760 | set by sender, so that the second statement is |
| 1761 | just protection against buggy protocols. |
| 1762 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1763 | skb_reset_mac_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1765 | if (skb_network_header(skb2) < skb2->data || |
Simon Horman | ced14f6 | 2013-05-28 20:34:25 +0000 | [diff] [blame] | 1766 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1767 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", |
| 1768 | ntohs(skb2->protocol), |
| 1769 | dev->name); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1770 | skb_reset_network_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | } |
| 1772 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1773 | skb2->transport_header = skb2->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | skb2->pkt_type = PACKET_OUTGOING; |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1775 | pt_prev = ptype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | } |
| 1777 | } |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1778 | if (pt_prev) |
| 1779 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | rcu_read_unlock(); |
| 1781 | } |
| 1782 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1783 | /** |
| 1784 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 1785 | * @dev: Network device |
| 1786 | * @txq: number of queues available |
| 1787 | * |
| 1788 | * If real_num_tx_queues is changed the tc mappings may no longer be |
| 1789 | * valid. To resolve this verify the tc mapping remains valid and if |
| 1790 | * not NULL the mapping. With no priorities mapping to this |
| 1791 | * offset/count pair it will no longer be used. In the worst case TC0 |
| 1792 | * is invalid nothing can be done so disable priority mappings. If is |
| 1793 | * expected that drivers will fix this mapping if they can before |
| 1794 | * calling netif_set_real_num_tx_queues. |
| 1795 | */ |
Eric Dumazet | bb134d2 | 2011-01-20 19:18:08 +0000 | [diff] [blame] | 1796 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 1797 | { |
| 1798 | int i; |
| 1799 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; |
| 1800 | |
| 1801 | /* If TC0 is invalidated disable TC mapping */ |
| 1802 | if (tc->offset + tc->count > txq) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 1803 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 1804 | dev->num_tc = 0; |
| 1805 | return; |
| 1806 | } |
| 1807 | |
| 1808 | /* Invalidated prio to tc mappings set to TC0 */ |
| 1809 | for (i = 1; i < TC_BITMASK + 1; i++) { |
| 1810 | int q = netdev_get_prio_tc_map(dev, i); |
| 1811 | |
| 1812 | tc = &dev->tc_to_txq[q]; |
| 1813 | if (tc->offset + tc->count > txq) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 1814 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
| 1815 | i, q); |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 1816 | netdev_set_prio_tc_map(dev, i, 0); |
| 1817 | } |
| 1818 | } |
| 1819 | } |
| 1820 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1821 | #ifdef CONFIG_XPS |
| 1822 | static DEFINE_MUTEX(xps_map_mutex); |
| 1823 | #define xmap_dereference(P) \ |
| 1824 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) |
| 1825 | |
Alexander Duyck | 10cdc3f | 2013-01-10 08:57:17 +0000 | [diff] [blame] | 1826 | static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps, |
| 1827 | int cpu, u16 index) |
| 1828 | { |
| 1829 | struct xps_map *map = NULL; |
| 1830 | int pos; |
| 1831 | |
| 1832 | if (dev_maps) |
| 1833 | map = xmap_dereference(dev_maps->cpu_map[cpu]); |
| 1834 | |
| 1835 | for (pos = 0; map && pos < map->len; pos++) { |
| 1836 | if (map->queues[pos] == index) { |
| 1837 | if (map->len > 1) { |
| 1838 | map->queues[pos] = map->queues[--map->len]; |
| 1839 | } else { |
| 1840 | RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL); |
| 1841 | kfree_rcu(map, rcu); |
| 1842 | map = NULL; |
| 1843 | } |
| 1844 | break; |
| 1845 | } |
| 1846 | } |
| 1847 | |
| 1848 | return map; |
| 1849 | } |
| 1850 | |
Alexander Duyck | 024e967 | 2013-01-10 08:57:46 +0000 | [diff] [blame] | 1851 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1852 | { |
| 1853 | struct xps_dev_maps *dev_maps; |
Alexander Duyck | 024e967 | 2013-01-10 08:57:46 +0000 | [diff] [blame] | 1854 | int cpu, i; |
Alexander Duyck | 10cdc3f | 2013-01-10 08:57:17 +0000 | [diff] [blame] | 1855 | bool active = false; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1856 | |
| 1857 | mutex_lock(&xps_map_mutex); |
| 1858 | dev_maps = xmap_dereference(dev->xps_maps); |
| 1859 | |
| 1860 | if (!dev_maps) |
| 1861 | goto out_no_maps; |
| 1862 | |
Alexander Duyck | 10cdc3f | 2013-01-10 08:57:17 +0000 | [diff] [blame] | 1863 | for_each_possible_cpu(cpu) { |
Alexander Duyck | 024e967 | 2013-01-10 08:57:46 +0000 | [diff] [blame] | 1864 | for (i = index; i < dev->num_tx_queues; i++) { |
| 1865 | if (!remove_xps_queue(dev_maps, cpu, i)) |
| 1866 | break; |
| 1867 | } |
| 1868 | if (i == dev->num_tx_queues) |
Alexander Duyck | 10cdc3f | 2013-01-10 08:57:17 +0000 | [diff] [blame] | 1869 | active = true; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1870 | } |
| 1871 | |
Alexander Duyck | 10cdc3f | 2013-01-10 08:57:17 +0000 | [diff] [blame] | 1872 | if (!active) { |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1873 | RCU_INIT_POINTER(dev->xps_maps, NULL); |
| 1874 | kfree_rcu(dev_maps, rcu); |
| 1875 | } |
| 1876 | |
Alexander Duyck | 024e967 | 2013-01-10 08:57:46 +0000 | [diff] [blame] | 1877 | for (i = index; i < dev->num_tx_queues; i++) |
| 1878 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i), |
| 1879 | NUMA_NO_NODE); |
| 1880 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1881 | out_no_maps: |
| 1882 | mutex_unlock(&xps_map_mutex); |
| 1883 | } |
| 1884 | |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1885 | static struct xps_map *expand_xps_map(struct xps_map *map, |
| 1886 | int cpu, u16 index) |
| 1887 | { |
| 1888 | struct xps_map *new_map; |
| 1889 | int alloc_len = XPS_MIN_MAP_ALLOC; |
| 1890 | int i, pos; |
| 1891 | |
| 1892 | for (pos = 0; map && pos < map->len; pos++) { |
| 1893 | if (map->queues[pos] != index) |
| 1894 | continue; |
| 1895 | return map; |
| 1896 | } |
| 1897 | |
| 1898 | /* Need to add queue to this CPU's existing map */ |
| 1899 | if (map) { |
| 1900 | if (pos < map->alloc_len) |
| 1901 | return map; |
| 1902 | |
| 1903 | alloc_len = map->alloc_len * 2; |
| 1904 | } |
| 1905 | |
| 1906 | /* Need to allocate new map to store queue on this CPU's map */ |
| 1907 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, |
| 1908 | cpu_to_node(cpu)); |
| 1909 | if (!new_map) |
| 1910 | return NULL; |
| 1911 | |
| 1912 | for (i = 0; i < pos; i++) |
| 1913 | new_map->queues[i] = map->queues[i]; |
| 1914 | new_map->alloc_len = alloc_len; |
| 1915 | new_map->len = pos; |
| 1916 | |
| 1917 | return new_map; |
| 1918 | } |
| 1919 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1920 | int netif_set_xps_queue(struct net_device *dev, struct cpumask *mask, u16 index) |
| 1921 | { |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1922 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1923 | struct xps_map *map, *new_map; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1924 | int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES); |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1925 | int cpu, numa_node_id = -2; |
| 1926 | bool active = false; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1927 | |
| 1928 | mutex_lock(&xps_map_mutex); |
| 1929 | |
| 1930 | dev_maps = xmap_dereference(dev->xps_maps); |
| 1931 | |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1932 | /* allocate memory for queue storage */ |
| 1933 | for_each_online_cpu(cpu) { |
| 1934 | if (!cpumask_test_cpu(cpu, mask)) |
| 1935 | continue; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1936 | |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1937 | if (!new_dev_maps) |
| 1938 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); |
Alexander Duyck | 2bb60cb | 2013-02-22 06:38:44 +0000 | [diff] [blame] | 1939 | if (!new_dev_maps) { |
| 1940 | mutex_unlock(&xps_map_mutex); |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1941 | return -ENOMEM; |
Alexander Duyck | 2bb60cb | 2013-02-22 06:38:44 +0000 | [diff] [blame] | 1942 | } |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1943 | |
| 1944 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : |
| 1945 | NULL; |
| 1946 | |
| 1947 | map = expand_xps_map(map, cpu, index); |
| 1948 | if (!map) |
| 1949 | goto error; |
| 1950 | |
| 1951 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); |
| 1952 | } |
| 1953 | |
| 1954 | if (!new_dev_maps) |
| 1955 | goto out_no_new_maps; |
| 1956 | |
| 1957 | for_each_possible_cpu(cpu) { |
| 1958 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) { |
| 1959 | /* add queue to CPU maps */ |
| 1960 | int pos = 0; |
| 1961 | |
| 1962 | map = xmap_dereference(new_dev_maps->cpu_map[cpu]); |
| 1963 | while ((pos < map->len) && (map->queues[pos] != index)) |
| 1964 | pos++; |
| 1965 | |
| 1966 | if (pos == map->len) |
| 1967 | map->queues[map->len++] = index; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1968 | #ifdef CONFIG_NUMA |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1969 | if (numa_node_id == -2) |
| 1970 | numa_node_id = cpu_to_node(cpu); |
| 1971 | else if (numa_node_id != cpu_to_node(cpu)) |
| 1972 | numa_node_id = -1; |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1973 | #endif |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1974 | } else if (dev_maps) { |
| 1975 | /* fill in the new device map from the old device map */ |
| 1976 | map = xmap_dereference(dev_maps->cpu_map[cpu]); |
| 1977 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1978 | } |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1979 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1980 | } |
| 1981 | |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1982 | rcu_assign_pointer(dev->xps_maps, new_dev_maps); |
| 1983 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1984 | /* Cleanup old maps */ |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1985 | if (dev_maps) { |
| 1986 | for_each_possible_cpu(cpu) { |
| 1987 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); |
| 1988 | map = xmap_dereference(dev_maps->cpu_map[cpu]); |
| 1989 | if (map && map != new_map) |
| 1990 | kfree_rcu(map, rcu); |
| 1991 | } |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1992 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1993 | kfree_rcu(dev_maps, rcu); |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1994 | } |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 1995 | |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 1996 | dev_maps = new_dev_maps; |
| 1997 | active = true; |
| 1998 | |
| 1999 | out_no_new_maps: |
| 2000 | /* update Tx queue numa node */ |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 2001 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), |
| 2002 | (numa_node_id >= 0) ? numa_node_id : |
| 2003 | NUMA_NO_NODE); |
| 2004 | |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 2005 | if (!dev_maps) |
| 2006 | goto out_no_maps; |
| 2007 | |
| 2008 | /* removes queue from unused CPUs */ |
| 2009 | for_each_possible_cpu(cpu) { |
| 2010 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) |
| 2011 | continue; |
| 2012 | |
| 2013 | if (remove_xps_queue(dev_maps, cpu, index)) |
| 2014 | active = true; |
| 2015 | } |
| 2016 | |
| 2017 | /* free map if not active */ |
| 2018 | if (!active) { |
| 2019 | RCU_INIT_POINTER(dev->xps_maps, NULL); |
| 2020 | kfree_rcu(dev_maps, rcu); |
| 2021 | } |
| 2022 | |
| 2023 | out_no_maps: |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 2024 | mutex_unlock(&xps_map_mutex); |
| 2025 | |
| 2026 | return 0; |
| 2027 | error: |
Alexander Duyck | 01c5f86 | 2013-01-10 08:57:35 +0000 | [diff] [blame] | 2028 | /* remove any maps that we added */ |
| 2029 | for_each_possible_cpu(cpu) { |
| 2030 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); |
| 2031 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : |
| 2032 | NULL; |
| 2033 | if (new_map && new_map != map) |
| 2034 | kfree(new_map); |
| 2035 | } |
| 2036 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 2037 | mutex_unlock(&xps_map_mutex); |
| 2038 | |
Alexander Duyck | 537c00d | 2013-01-10 08:57:02 +0000 | [diff] [blame] | 2039 | kfree(new_dev_maps); |
| 2040 | return -ENOMEM; |
| 2041 | } |
| 2042 | EXPORT_SYMBOL(netif_set_xps_queue); |
| 2043 | |
| 2044 | #endif |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 2045 | /* |
| 2046 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues |
| 2047 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. |
| 2048 | */ |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 2049 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 2050 | { |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 2051 | int rc; |
| 2052 | |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 2053 | if (txq < 1 || txq > dev->num_tx_queues) |
| 2054 | return -EINVAL; |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 2055 | |
Ben Hutchings | 5c56580 | 2011-02-15 19:39:21 +0000 | [diff] [blame] | 2056 | if (dev->reg_state == NETREG_REGISTERED || |
| 2057 | dev->reg_state == NETREG_UNREGISTERING) { |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 2058 | ASSERT_RTNL(); |
| 2059 | |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 2060 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
| 2061 | txq); |
Tom Herbert | bf26414 | 2010-11-26 08:36:09 +0000 | [diff] [blame] | 2062 | if (rc) |
| 2063 | return rc; |
| 2064 | |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 2065 | if (dev->num_tc) |
| 2066 | netif_setup_tc(dev, txq); |
| 2067 | |
Alexander Duyck | 024e967 | 2013-01-10 08:57:46 +0000 | [diff] [blame] | 2068 | if (txq < dev->real_num_tx_queues) { |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 2069 | qdisc_reset_all_tx_gt(dev, txq); |
Alexander Duyck | 024e967 | 2013-01-10 08:57:46 +0000 | [diff] [blame] | 2070 | #ifdef CONFIG_XPS |
| 2071 | netif_reset_xps_queues_gt(dev, txq); |
| 2072 | #endif |
| 2073 | } |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 2074 | } |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 2075 | |
| 2076 | dev->real_num_tx_queues = txq; |
| 2077 | return 0; |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 2078 | } |
| 2079 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2080 | |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 2081 | #ifdef CONFIG_RPS |
| 2082 | /** |
| 2083 | * netif_set_real_num_rx_queues - set actual number of RX queues used |
| 2084 | * @dev: Network device |
| 2085 | * @rxq: Actual number of RX queues |
| 2086 | * |
| 2087 | * This must be called either with the rtnl_lock held or before |
| 2088 | * registration of the net device. Returns 0 on success, or a |
Ben Hutchings | 4e7f795 | 2010-10-08 10:33:39 -0700 | [diff] [blame] | 2089 | * negative error code. If called before registration, it always |
| 2090 | * succeeds. |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 2091 | */ |
| 2092 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) |
| 2093 | { |
| 2094 | int rc; |
| 2095 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 2096 | if (rxq < 1 || rxq > dev->num_rx_queues) |
| 2097 | return -EINVAL; |
| 2098 | |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 2099 | if (dev->reg_state == NETREG_REGISTERED) { |
| 2100 | ASSERT_RTNL(); |
| 2101 | |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 2102 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
| 2103 | rxq); |
| 2104 | if (rc) |
| 2105 | return rc; |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 2106 | } |
| 2107 | |
| 2108 | dev->real_num_rx_queues = rxq; |
| 2109 | return 0; |
| 2110 | } |
| 2111 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); |
| 2112 | #endif |
| 2113 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 2114 | /** |
| 2115 | * netif_get_num_default_rss_queues - default number of RSS queues |
Yuval Mintz | 16917b8 | 2012-07-01 03:18:50 +0000 | [diff] [blame] | 2116 | * |
| 2117 | * This routine should set an upper limit on the number of RSS queues |
| 2118 | * used by default by multiqueue devices. |
| 2119 | */ |
Ben Hutchings | a55b138 | 2012-07-10 10:54:38 +0000 | [diff] [blame] | 2120 | int netif_get_num_default_rss_queues(void) |
Yuval Mintz | 16917b8 | 2012-07-01 03:18:50 +0000 | [diff] [blame] | 2121 | { |
| 2122 | return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); |
| 2123 | } |
| 2124 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); |
| 2125 | |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 2126 | static inline void __netif_reschedule(struct Qdisc *q) |
| 2127 | { |
| 2128 | struct softnet_data *sd; |
| 2129 | unsigned long flags; |
| 2130 | |
| 2131 | local_irq_save(flags); |
| 2132 | sd = &__get_cpu_var(softnet_data); |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 2133 | q->next_sched = NULL; |
| 2134 | *sd->output_queue_tailp = q; |
| 2135 | sd->output_queue_tailp = &q->next_sched; |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 2136 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 2137 | local_irq_restore(flags); |
| 2138 | } |
| 2139 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2140 | void __netif_schedule(struct Qdisc *q) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2141 | { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 2142 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) |
| 2143 | __netif_reschedule(q); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2144 | } |
| 2145 | EXPORT_SYMBOL(__netif_schedule); |
| 2146 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2147 | void dev_kfree_skb_irq(struct sk_buff *skb) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2148 | { |
David S. Miller | 3578b0c | 2010-08-03 00:24:04 -0700 | [diff] [blame] | 2149 | if (atomic_dec_and_test(&skb->users)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2150 | struct softnet_data *sd; |
| 2151 | unsigned long flags; |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2152 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2153 | local_irq_save(flags); |
| 2154 | sd = &__get_cpu_var(softnet_data); |
| 2155 | skb->next = sd->completion_queue; |
| 2156 | sd->completion_queue = skb; |
| 2157 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 2158 | local_irq_restore(flags); |
| 2159 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2160 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2161 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2162 | |
| 2163 | void dev_kfree_skb_any(struct sk_buff *skb) |
| 2164 | { |
| 2165 | if (in_irq() || irqs_disabled()) |
| 2166 | dev_kfree_skb_irq(skb); |
| 2167 | else |
| 2168 | dev_kfree_skb(skb); |
| 2169 | } |
| 2170 | EXPORT_SYMBOL(dev_kfree_skb_any); |
| 2171 | |
| 2172 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2173 | /** |
| 2174 | * netif_device_detach - mark device as removed |
| 2175 | * @dev: network device |
| 2176 | * |
| 2177 | * Mark device as removed from system and therefore no longer available. |
| 2178 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2179 | void netif_device_detach(struct net_device *dev) |
| 2180 | { |
| 2181 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 2182 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 2183 | netif_tx_stop_all_queues(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2184 | } |
| 2185 | } |
| 2186 | EXPORT_SYMBOL(netif_device_detach); |
| 2187 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2188 | /** |
| 2189 | * netif_device_attach - mark device as attached |
| 2190 | * @dev: network device |
| 2191 | * |
| 2192 | * Mark device as attached from system and restart if needed. |
| 2193 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2194 | void netif_device_attach(struct net_device *dev) |
| 2195 | { |
| 2196 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 2197 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 2198 | netif_tx_wake_all_queues(dev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2199 | __netdev_watchdog_up(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 2200 | } |
| 2201 | } |
| 2202 | EXPORT_SYMBOL(netif_device_attach); |
| 2203 | |
Ben Hutchings | 36c9247 | 2012-01-17 07:57:56 +0000 | [diff] [blame] | 2204 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
| 2205 | { |
Michał Mirosław | 65e9d2f | 2012-01-17 10:00:40 +0000 | [diff] [blame] | 2206 | static const netdev_features_t null_features = 0; |
Ben Hutchings | 36c9247 | 2012-01-17 07:57:56 +0000 | [diff] [blame] | 2207 | struct net_device *dev = skb->dev; |
| 2208 | const char *driver = ""; |
| 2209 | |
Ben Greear | c846ad9 | 2013-04-19 10:45:52 +0000 | [diff] [blame] | 2210 | if (!net_ratelimit()) |
| 2211 | return; |
| 2212 | |
Ben Hutchings | 36c9247 | 2012-01-17 07:57:56 +0000 | [diff] [blame] | 2213 | if (dev && dev->dev.parent) |
| 2214 | driver = dev_driver_string(dev->dev.parent); |
| 2215 | |
| 2216 | WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d " |
| 2217 | "gso_type=%d ip_summed=%d\n", |
Michał Mirosław | 65e9d2f | 2012-01-17 10:00:40 +0000 | [diff] [blame] | 2218 | driver, dev ? &dev->features : &null_features, |
| 2219 | skb->sk ? &skb->sk->sk_route_caps : &null_features, |
Ben Hutchings | 36c9247 | 2012-01-17 07:57:56 +0000 | [diff] [blame] | 2220 | skb->len, skb->data_len, skb_shinfo(skb)->gso_size, |
| 2221 | skb_shinfo(skb)->gso_type, skb->ip_summed); |
| 2222 | } |
| 2223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | /* |
| 2225 | * Invalidate hardware checksum when packet is to be mangled, and |
| 2226 | * complete checksum manually on outgoing path. |
| 2227 | */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 2228 | int skb_checksum_help(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2229 | { |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 2230 | __wsum csum; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 2231 | int ret = 0, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 2233 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 2234 | goto out_set_summed; |
| 2235 | |
| 2236 | if (unlikely(skb_shinfo(skb)->gso_size)) { |
Ben Hutchings | 36c9247 | 2012-01-17 07:57:56 +0000 | [diff] [blame] | 2237 | skb_warn_bad_offload(skb); |
| 2238 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | } |
| 2240 | |
Eric Dumazet | cef401d | 2013-01-25 20:34:37 +0000 | [diff] [blame] | 2241 | /* Before computing a checksum, we should make sure no frag could |
| 2242 | * be modified by an external entity : checksum could be wrong. |
| 2243 | */ |
| 2244 | if (skb_has_shared_frag(skb)) { |
| 2245 | ret = __skb_linearize(skb); |
| 2246 | if (ret) |
| 2247 | goto out; |
| 2248 | } |
| 2249 | |
Michał Mirosław | 55508d6 | 2010-12-14 15:24:08 +0000 | [diff] [blame] | 2250 | offset = skb_checksum_start_offset(skb); |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 2251 | BUG_ON(offset >= skb_headlen(skb)); |
| 2252 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 2253 | |
| 2254 | offset += skb->csum_offset; |
| 2255 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); |
| 2256 | |
| 2257 | if (skb_cloned(skb) && |
| 2258 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
| 2260 | if (ret) |
| 2261 | goto out; |
| 2262 | } |
| 2263 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 2264 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 2265 | out_set_summed: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | skb->ip_summed = CHECKSUM_NONE; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2267 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | return ret; |
| 2269 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2270 | EXPORT_SYMBOL(skb_checksum_help); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | |
Pravin B Shelar | ec5f061 | 2013-03-07 09:28:01 +0000 | [diff] [blame] | 2272 | __be16 skb_network_protocol(struct sk_buff *skb) |
| 2273 | { |
| 2274 | __be16 type = skb->protocol; |
David S. Miller | 6181659 | 2013-03-20 12:46:26 -0400 | [diff] [blame] | 2275 | int vlan_depth = ETH_HLEN; |
Pravin B Shelar | ec5f061 | 2013-03-07 09:28:01 +0000 | [diff] [blame] | 2276 | |
Pravin B Shelar | 19acc32 | 2013-05-07 20:41:07 +0000 | [diff] [blame] | 2277 | /* Tunnel gso handlers can set protocol to ethernet. */ |
| 2278 | if (type == htons(ETH_P_TEB)) { |
| 2279 | struct ethhdr *eth; |
| 2280 | |
| 2281 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) |
| 2282 | return 0; |
| 2283 | |
| 2284 | eth = (struct ethhdr *)skb_mac_header(skb); |
| 2285 | type = eth->h_proto; |
| 2286 | } |
| 2287 | |
Patrick McHardy | 8ad227f | 2013-04-19 02:04:31 +0000 | [diff] [blame] | 2288 | while (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) { |
Pravin B Shelar | ec5f061 | 2013-03-07 09:28:01 +0000 | [diff] [blame] | 2289 | struct vlan_hdr *vh; |
| 2290 | |
| 2291 | if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN))) |
| 2292 | return 0; |
| 2293 | |
| 2294 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); |
| 2295 | type = vh->h_vlan_encapsulated_proto; |
| 2296 | vlan_depth += VLAN_HLEN; |
| 2297 | } |
| 2298 | |
| 2299 | return type; |
| 2300 | } |
| 2301 | |
Pravin B Shelar | 05e8ef4 | 2013-02-14 09:44:55 +0000 | [diff] [blame] | 2302 | /** |
| 2303 | * skb_mac_gso_segment - mac layer segmentation handler. |
| 2304 | * @skb: buffer to segment |
| 2305 | * @features: features for the output path (see dev->features) |
| 2306 | */ |
| 2307 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, |
| 2308 | netdev_features_t features) |
| 2309 | { |
| 2310 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); |
| 2311 | struct packet_offload *ptype; |
Pravin B Shelar | ec5f061 | 2013-03-07 09:28:01 +0000 | [diff] [blame] | 2312 | __be16 type = skb_network_protocol(skb); |
Pravin B Shelar | 05e8ef4 | 2013-02-14 09:44:55 +0000 | [diff] [blame] | 2313 | |
Pravin B Shelar | ec5f061 | 2013-03-07 09:28:01 +0000 | [diff] [blame] | 2314 | if (unlikely(!type)) |
| 2315 | return ERR_PTR(-EINVAL); |
Pravin B Shelar | 05e8ef4 | 2013-02-14 09:44:55 +0000 | [diff] [blame] | 2316 | |
| 2317 | __skb_pull(skb, skb->mac_len); |
| 2318 | |
| 2319 | rcu_read_lock(); |
| 2320 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
| 2321 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
| 2322 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
| 2323 | int err; |
| 2324 | |
| 2325 | err = ptype->callbacks.gso_send_check(skb); |
| 2326 | segs = ERR_PTR(err); |
| 2327 | if (err || skb_gso_ok(skb, features)) |
| 2328 | break; |
| 2329 | __skb_push(skb, (skb->data - |
| 2330 | skb_network_header(skb))); |
| 2331 | } |
| 2332 | segs = ptype->callbacks.gso_segment(skb, features); |
| 2333 | break; |
| 2334 | } |
| 2335 | } |
| 2336 | rcu_read_unlock(); |
| 2337 | |
| 2338 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
| 2339 | |
| 2340 | return segs; |
| 2341 | } |
| 2342 | EXPORT_SYMBOL(skb_mac_gso_segment); |
| 2343 | |
| 2344 | |
Cong Wang | 12b0004 | 2013-02-05 16:36:38 +0000 | [diff] [blame] | 2345 | /* openvswitch calls this on rx path, so we need a different check. |
| 2346 | */ |
| 2347 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) |
| 2348 | { |
| 2349 | if (tx_path) |
| 2350 | return skb->ip_summed != CHECKSUM_PARTIAL; |
| 2351 | else |
| 2352 | return skb->ip_summed == CHECKSUM_NONE; |
| 2353 | } |
| 2354 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2355 | /** |
Cong Wang | 12b0004 | 2013-02-05 16:36:38 +0000 | [diff] [blame] | 2356 | * __skb_gso_segment - Perform segmentation on skb. |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2357 | * @skb: buffer to segment |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2358 | * @features: features for the output path (see dev->features) |
Cong Wang | 12b0004 | 2013-02-05 16:36:38 +0000 | [diff] [blame] | 2359 | * @tx_path: whether it is called in TX path |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2360 | * |
| 2361 | * This function segments the given skb and returns a list of segments. |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2362 | * |
| 2363 | * It may return NULL if the skb requires no segmentation. This is |
| 2364 | * only possible when GSO is used for verifying header integrity. |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2365 | */ |
Cong Wang | 12b0004 | 2013-02-05 16:36:38 +0000 | [diff] [blame] | 2366 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, |
| 2367 | netdev_features_t features, bool tx_path) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2368 | { |
Cong Wang | 12b0004 | 2013-02-05 16:36:38 +0000 | [diff] [blame] | 2369 | if (unlikely(skb_needs_check(skb, tx_path))) { |
Pravin B Shelar | 05e8ef4 | 2013-02-14 09:44:55 +0000 | [diff] [blame] | 2370 | int err; |
| 2371 | |
Ben Hutchings | 36c9247 | 2012-01-17 07:57:56 +0000 | [diff] [blame] | 2372 | skb_warn_bad_offload(skb); |
Herbert Xu | 67fd1a7 | 2009-01-19 16:26:44 -0800 | [diff] [blame] | 2373 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 2374 | if (skb_header_cloned(skb) && |
| 2375 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) |
| 2376 | return ERR_PTR(err); |
| 2377 | } |
| 2378 | |
Pravin B Shelar | 68c3316 | 2013-02-14 14:02:41 +0000 | [diff] [blame] | 2379 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
Pravin B Shelar | 05e8ef4 | 2013-02-14 09:44:55 +0000 | [diff] [blame] | 2380 | skb_reset_mac_header(skb); |
| 2381 | skb_reset_mac_len(skb); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2382 | |
Pravin B Shelar | 05e8ef4 | 2013-02-14 09:44:55 +0000 | [diff] [blame] | 2383 | return skb_mac_gso_segment(skb, features); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2384 | } |
Cong Wang | 12b0004 | 2013-02-05 16:36:38 +0000 | [diff] [blame] | 2385 | EXPORT_SYMBOL(__skb_gso_segment); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2386 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 2387 | /* Take action when hardware reception checksum errors are detected. */ |
| 2388 | #ifdef CONFIG_BUG |
| 2389 | void netdev_rx_csum_fault(struct net_device *dev) |
| 2390 | { |
| 2391 | if (net_ratelimit()) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 2392 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 2393 | dump_stack(); |
| 2394 | } |
| 2395 | } |
| 2396 | EXPORT_SYMBOL(netdev_rx_csum_fault); |
| 2397 | #endif |
| 2398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | /* Actually, we should eliminate this check as soon as we know, that: |
| 2400 | * 1. IOMMU is present and allows to map all the memory. |
| 2401 | * 2. No high memory really exists on this machine. |
| 2402 | */ |
| 2403 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 2404 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | { |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 2406 | #ifdef CONFIG_HIGHMEM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | int i; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2408 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 2409 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 2410 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| 2411 | if (PageHighMem(skb_frag_page(frag))) |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2412 | return 1; |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 2413 | } |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2414 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2416 | if (PCI_DMA_BUS_IS_PHYS) { |
| 2417 | struct device *pdev = dev->dev.parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2418 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 2419 | if (!pdev) |
| 2420 | return 0; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2421 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 2422 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| 2423 | dma_addr_t addr = page_to_phys(skb_frag_page(frag)); |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2424 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
| 2425 | return 1; |
| 2426 | } |
| 2427 | } |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 2428 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | return 0; |
| 2430 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2432 | struct dev_gso_cb { |
| 2433 | void (*destructor)(struct sk_buff *skb); |
| 2434 | }; |
| 2435 | |
| 2436 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) |
| 2437 | |
| 2438 | static void dev_gso_skb_destructor(struct sk_buff *skb) |
| 2439 | { |
| 2440 | struct dev_gso_cb *cb; |
| 2441 | |
| 2442 | do { |
| 2443 | struct sk_buff *nskb = skb->next; |
| 2444 | |
| 2445 | skb->next = nskb->next; |
| 2446 | nskb->next = NULL; |
| 2447 | kfree_skb(nskb); |
| 2448 | } while (skb->next); |
| 2449 | |
| 2450 | cb = DEV_GSO_CB(skb); |
| 2451 | if (cb->destructor) |
| 2452 | cb->destructor(skb); |
| 2453 | } |
| 2454 | |
| 2455 | /** |
| 2456 | * dev_gso_segment - Perform emulated hardware segmentation on skb. |
| 2457 | * @skb: buffer to segment |
Jesse Gross | 91ecb63 | 2011-01-09 06:23:33 +0000 | [diff] [blame] | 2458 | * @features: device features as applicable to this skb |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2459 | * |
| 2460 | * This function segments the given skb and stores the list of segments |
| 2461 | * in skb->next. |
| 2462 | */ |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 2463 | static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2464 | { |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2465 | struct sk_buff *segs; |
| 2466 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2467 | segs = skb_gso_segment(skb, features); |
| 2468 | |
| 2469 | /* Verifying header integrity only. */ |
| 2470 | if (!segs) |
| 2471 | return 0; |
| 2472 | |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 2473 | if (IS_ERR(segs)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2474 | return PTR_ERR(segs); |
| 2475 | |
| 2476 | skb->next = segs; |
| 2477 | DEV_GSO_CB(skb)->destructor = skb->destructor; |
| 2478 | skb->destructor = dev_gso_skb_destructor; |
| 2479 | |
| 2480 | return 0; |
| 2481 | } |
| 2482 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 2483 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
Alexander Duyck | cdbaa0b | 2013-07-10 17:05:06 -0700 | [diff] [blame] | 2484 | netdev_features_t features) |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2485 | { |
Ed Cashin | c0d680e | 2012-09-19 15:49:00 +0000 | [diff] [blame] | 2486 | if (skb->ip_summed != CHECKSUM_NONE && |
Alexander Duyck | cdbaa0b | 2013-07-10 17:05:06 -0700 | [diff] [blame] | 2487 | !can_checksum_protocol(features, skb_network_protocol(skb))) { |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2488 | features &= ~NETIF_F_ALL_CSUM; |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2489 | } else if (illegal_highdma(skb->dev, skb)) { |
| 2490 | features &= ~NETIF_F_SG; |
| 2491 | } |
| 2492 | |
| 2493 | return features; |
| 2494 | } |
| 2495 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 2496 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2497 | { |
| 2498 | __be16 protocol = skb->protocol; |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 2499 | netdev_features_t features = skb->dev->features; |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2500 | |
Ben Hutchings | 30b678d | 2012-07-30 15:57:00 +0000 | [diff] [blame] | 2501 | if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs) |
| 2502 | features &= ~NETIF_F_GSO_MASK; |
| 2503 | |
Patrick McHardy | 8ad227f | 2013-04-19 02:04:31 +0000 | [diff] [blame] | 2504 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) { |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2505 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
| 2506 | protocol = veh->h_vlan_encapsulated_proto; |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2507 | } else if (!vlan_tx_tag_present(skb)) { |
Alexander Duyck | cdbaa0b | 2013-07-10 17:05:06 -0700 | [diff] [blame] | 2508 | return harmonize_features(skb, features); |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2509 | } |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2510 | |
Patrick McHardy | 8ad227f | 2013-04-19 02:04:31 +0000 | [diff] [blame] | 2511 | features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX | |
| 2512 | NETIF_F_HW_VLAN_STAG_TX); |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2513 | |
Alexander Duyck | cdbaa0b | 2013-07-10 17:05:06 -0700 | [diff] [blame] | 2514 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2515 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | |
Patrick McHardy | 8ad227f | 2013-04-19 02:04:31 +0000 | [diff] [blame] | 2516 | NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX | |
| 2517 | NETIF_F_HW_VLAN_STAG_TX; |
Alexander Duyck | cdbaa0b | 2013-07-10 17:05:06 -0700 | [diff] [blame] | 2518 | |
| 2519 | return harmonize_features(skb, features); |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2520 | } |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2521 | EXPORT_SYMBOL(netif_skb_features); |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2522 | |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2523 | /* |
| 2524 | * Returns true if either: |
| 2525 | * 1. skb has frag_list and the device doesn't support FRAGLIST, or |
Rami Rosen | d1a53df | 2012-08-27 23:39:24 +0000 | [diff] [blame] | 2526 | * 2. skb is fragmented and the device does not support SG. |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2527 | */ |
| 2528 | static inline int skb_needs_linearize(struct sk_buff *skb, |
Patrick McHardy | 6708c9e | 2013-05-01 22:36:49 +0000 | [diff] [blame] | 2529 | netdev_features_t features) |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2530 | { |
Jesse Gross | 02932ce | 2011-01-09 06:23:34 +0000 | [diff] [blame] | 2531 | return skb_is_nonlinear(skb) && |
| 2532 | ((skb_has_frag_list(skb) && |
| 2533 | !(features & NETIF_F_FRAGLIST)) || |
Jesse Gross | e1e78db | 2010-10-29 12:14:53 +0000 | [diff] [blame] | 2534 | (skb_shinfo(skb)->nr_frags && |
Jesse Gross | 02932ce | 2011-01-09 06:23:34 +0000 | [diff] [blame] | 2535 | !(features & NETIF_F_SG))); |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2536 | } |
| 2537 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2538 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
| 2539 | struct netdev_queue *txq) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2540 | { |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 2541 | const struct net_device_ops *ops = dev->netdev_ops; |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2542 | int rc = NETDEV_TX_OK; |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2543 | unsigned int skb_len; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 2544 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2545 | if (likely(!skb->next)) { |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 2546 | netdev_features_t features; |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 2547 | |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 2548 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2549 | * If device doesn't need skb->dst, release it right now while |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 2550 | * its hot in this cpu cache |
| 2551 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 2552 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 2553 | skb_dst_drop(skb); |
| 2554 | |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 2555 | features = netif_skb_features(skb); |
| 2556 | |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 2557 | if (vlan_tx_tag_present(skb) && |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 2558 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { |
| 2559 | skb = __vlan_put_tag(skb, skb->vlan_proto, |
| 2560 | vlan_tx_tag_get(skb)); |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 2561 | if (unlikely(!skb)) |
| 2562 | goto out; |
| 2563 | |
| 2564 | skb->vlan_tci = 0; |
| 2565 | } |
| 2566 | |
Alexander Duyck | fc70fb6 | 2012-12-07 14:14:15 +0000 | [diff] [blame] | 2567 | /* If encapsulation offload request, verify we are testing |
| 2568 | * hardware encapsulation features instead of standard |
| 2569 | * features for the netdev |
| 2570 | */ |
| 2571 | if (skb->encapsulation) |
| 2572 | features &= dev->hw_enc_features; |
| 2573 | |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 2574 | if (netif_needs_gso(skb, features)) { |
Jesse Gross | 91ecb63 | 2011-01-09 06:23:33 +0000 | [diff] [blame] | 2575 | if (unlikely(dev_gso_segment(skb, features))) |
David S. Miller | 9ccb897 | 2010-04-22 01:02:07 -0700 | [diff] [blame] | 2576 | goto out_kfree_skb; |
| 2577 | if (skb->next) |
| 2578 | goto gso; |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2579 | } else { |
Jesse Gross | 02932ce | 2011-01-09 06:23:34 +0000 | [diff] [blame] | 2580 | if (skb_needs_linearize(skb, features) && |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2581 | __skb_linearize(skb)) |
| 2582 | goto out_kfree_skb; |
| 2583 | |
| 2584 | /* If packet is not checksummed and device does not |
| 2585 | * support checksumming for this protocol, complete |
| 2586 | * checksumming here. |
| 2587 | */ |
| 2588 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Alexander Duyck | fc70fb6 | 2012-12-07 14:14:15 +0000 | [diff] [blame] | 2589 | if (skb->encapsulation) |
| 2590 | skb_set_inner_transport_header(skb, |
| 2591 | skb_checksum_start_offset(skb)); |
| 2592 | else |
| 2593 | skb_set_transport_header(skb, |
| 2594 | skb_checksum_start_offset(skb)); |
Jesse Gross | 0363466 | 2011-01-09 06:23:35 +0000 | [diff] [blame] | 2595 | if (!(features & NETIF_F_ALL_CSUM) && |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2596 | skb_checksum_help(skb)) |
| 2597 | goto out_kfree_skb; |
| 2598 | } |
David S. Miller | 9ccb897 | 2010-04-22 01:02:07 -0700 | [diff] [blame] | 2599 | } |
| 2600 | |
Eric Dumazet | b40863c | 2012-09-18 20:44:49 +0000 | [diff] [blame] | 2601 | if (!list_empty(&ptype_all)) |
| 2602 | dev_queue_xmit_nit(skb, dev); |
| 2603 | |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2604 | skb_len = skb->len; |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 2605 | rc = ops->ndo_start_xmit(skb, dev); |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2606 | trace_net_dev_xmit(skb, rc, dev, skb_len); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 2607 | if (rc == NETDEV_TX_OK) |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 2608 | txq_trans_update(txq); |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 2609 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2610 | } |
| 2611 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2612 | gso: |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2613 | do { |
| 2614 | struct sk_buff *nskb = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2615 | |
| 2616 | skb->next = nskb->next; |
| 2617 | nskb->next = NULL; |
Krishna Kumar | 068a2de | 2009-12-09 20:59:58 +0000 | [diff] [blame] | 2618 | |
Eric Dumazet | b40863c | 2012-09-18 20:44:49 +0000 | [diff] [blame] | 2619 | if (!list_empty(&ptype_all)) |
| 2620 | dev_queue_xmit_nit(nskb, dev); |
| 2621 | |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2622 | skb_len = nskb->len; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 2623 | rc = ops->ndo_start_xmit(nskb, dev); |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2624 | trace_net_dev_xmit(nskb, rc, dev, skb_len); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 2625 | if (unlikely(rc != NETDEV_TX_OK)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2626 | if (rc & ~NETDEV_TX_MASK) |
| 2627 | goto out_kfree_gso_skb; |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 2628 | nskb->next = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2629 | skb->next = nskb; |
| 2630 | return rc; |
| 2631 | } |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 2632 | txq_trans_update(txq); |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 2633 | if (unlikely(netif_xmit_stopped(txq) && skb->next)) |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 2634 | return NETDEV_TX_BUSY; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2635 | } while (skb->next); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2636 | |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2637 | out_kfree_gso_skb: |
Sridhar Samudrala | 0c77215 | 2013-04-29 13:02:42 +0000 | [diff] [blame] | 2638 | if (likely(skb->next == NULL)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2639 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
Sridhar Samudrala | 0c77215 | 2013-04-29 13:02:42 +0000 | [diff] [blame] | 2640 | consume_skb(skb); |
| 2641 | return rc; |
| 2642 | } |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2643 | out_kfree_skb: |
| 2644 | kfree_skb(skb); |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 2645 | out: |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2646 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2647 | } |
| 2648 | |
Eric Dumazet | 1def923 | 2013-01-10 12:36:42 +0000 | [diff] [blame] | 2649 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
| 2650 | { |
| 2651 | const struct skb_shared_info *shinfo = skb_shinfo(skb); |
| 2652 | |
| 2653 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
| 2654 | |
| 2655 | /* To get more precise estimation of bytes sent on wire, |
| 2656 | * we add to pkt_len the headers size of all segments |
| 2657 | */ |
| 2658 | if (shinfo->gso_size) { |
Eric Dumazet | 757b8b1 | 2013-01-15 21:14:21 -0800 | [diff] [blame] | 2659 | unsigned int hdr_len; |
Jason Wang | 15e5a03 | 2013-03-25 20:19:59 +0000 | [diff] [blame] | 2660 | u16 gso_segs = shinfo->gso_segs; |
Eric Dumazet | 1def923 | 2013-01-10 12:36:42 +0000 | [diff] [blame] | 2661 | |
Eric Dumazet | 757b8b1 | 2013-01-15 21:14:21 -0800 | [diff] [blame] | 2662 | /* mac layer + network layer */ |
| 2663 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); |
| 2664 | |
| 2665 | /* + transport layer */ |
Eric Dumazet | 1def923 | 2013-01-10 12:36:42 +0000 | [diff] [blame] | 2666 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) |
| 2667 | hdr_len += tcp_hdrlen(skb); |
| 2668 | else |
| 2669 | hdr_len += sizeof(struct udphdr); |
Jason Wang | 15e5a03 | 2013-03-25 20:19:59 +0000 | [diff] [blame] | 2670 | |
| 2671 | if (shinfo->gso_type & SKB_GSO_DODGY) |
| 2672 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, |
| 2673 | shinfo->gso_size); |
| 2674 | |
| 2675 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; |
Eric Dumazet | 1def923 | 2013-01-10 12:36:42 +0000 | [diff] [blame] | 2676 | } |
| 2677 | } |
| 2678 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2679 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
| 2680 | struct net_device *dev, |
| 2681 | struct netdev_queue *txq) |
| 2682 | { |
| 2683 | spinlock_t *root_lock = qdisc_lock(q); |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2684 | bool contended; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2685 | int rc; |
| 2686 | |
Eric Dumazet | 1def923 | 2013-01-10 12:36:42 +0000 | [diff] [blame] | 2687 | qdisc_pkt_len_init(skb); |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2688 | qdisc_calculate_pkt_len(skb, q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2689 | /* |
| 2690 | * Heuristic to force contended enqueues to serialize on a |
| 2691 | * separate lock before trying to get qdisc main lock. |
| 2692 | * This permits __QDISC_STATE_RUNNING owner to get the lock more often |
| 2693 | * and dequeue packets faster. |
| 2694 | */ |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2695 | contended = qdisc_is_running(q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2696 | if (unlikely(contended)) |
| 2697 | spin_lock(&q->busylock); |
| 2698 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2699 | spin_lock(root_lock); |
| 2700 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { |
| 2701 | kfree_skb(skb); |
| 2702 | rc = NET_XMIT_DROP; |
| 2703 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 2704 | qdisc_run_begin(q)) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2705 | /* |
| 2706 | * This is a work-conserving queue; there are no old skbs |
| 2707 | * waiting to be sent out; and the qdisc is not running - |
| 2708 | * xmit the skb directly. |
| 2709 | */ |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 2710 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE)) |
| 2711 | skb_dst_force(skb); |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 2712 | |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 2713 | qdisc_bstats_update(q, skb); |
| 2714 | |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2715 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) { |
| 2716 | if (unlikely(contended)) { |
| 2717 | spin_unlock(&q->busylock); |
| 2718 | contended = false; |
| 2719 | } |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2720 | __qdisc_run(q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2721 | } else |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 2722 | qdisc_run_end(q); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2723 | |
| 2724 | rc = NET_XMIT_SUCCESS; |
| 2725 | } else { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 2726 | skb_dst_force(skb); |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2727 | rc = q->enqueue(skb, q) & NET_XMIT_MASK; |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2728 | if (qdisc_run_begin(q)) { |
| 2729 | if (unlikely(contended)) { |
| 2730 | spin_unlock(&q->busylock); |
| 2731 | contended = false; |
| 2732 | } |
| 2733 | __qdisc_run(q); |
| 2734 | } |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2735 | } |
| 2736 | spin_unlock(root_lock); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2737 | if (unlikely(contended)) |
| 2738 | spin_unlock(&q->busylock); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2739 | return rc; |
| 2740 | } |
| 2741 | |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 2742 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
| 2743 | static void skb_update_prio(struct sk_buff *skb) |
| 2744 | { |
Igor Maravic | 6977a79 | 2011-11-25 07:44:54 +0000 | [diff] [blame] | 2745 | struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 2746 | |
Eric Dumazet | 91c68ce | 2012-07-08 21:45:10 +0000 | [diff] [blame] | 2747 | if (!skb->priority && skb->sk && map) { |
| 2748 | unsigned int prioidx = skb->sk->sk_cgrp_prioidx; |
| 2749 | |
| 2750 | if (prioidx < map->priomap_len) |
| 2751 | skb->priority = map->priomap[prioidx]; |
| 2752 | } |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 2753 | } |
| 2754 | #else |
| 2755 | #define skb_update_prio(skb) |
| 2756 | #endif |
| 2757 | |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2758 | static DEFINE_PER_CPU(int, xmit_recursion); |
David S. Miller | 11a766c | 2010-10-25 12:51:55 -0700 | [diff] [blame] | 2759 | #define RECURSION_LIMIT 10 |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2760 | |
Dave Jones | d29f749 | 2008-07-22 14:09:06 -0700 | [diff] [blame] | 2761 | /** |
Michel Machado | 95603e2 | 2012-06-12 10:16:35 +0000 | [diff] [blame] | 2762 | * dev_loopback_xmit - loop back @skb |
| 2763 | * @skb: buffer to transmit |
| 2764 | */ |
| 2765 | int dev_loopback_xmit(struct sk_buff *skb) |
| 2766 | { |
| 2767 | skb_reset_mac_header(skb); |
| 2768 | __skb_pull(skb, skb_network_offset(skb)); |
| 2769 | skb->pkt_type = PACKET_LOOPBACK; |
| 2770 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 2771 | WARN_ON(!skb_dst(skb)); |
| 2772 | skb_dst_force(skb); |
| 2773 | netif_rx_ni(skb); |
| 2774 | return 0; |
| 2775 | } |
| 2776 | EXPORT_SYMBOL(dev_loopback_xmit); |
| 2777 | |
| 2778 | /** |
Dave Jones | d29f749 | 2008-07-22 14:09:06 -0700 | [diff] [blame] | 2779 | * dev_queue_xmit - transmit a buffer |
| 2780 | * @skb: buffer to transmit |
| 2781 | * |
| 2782 | * Queue a buffer for transmission to a network device. The caller must |
| 2783 | * have set the device and priority and built the buffer before calling |
| 2784 | * this function. The function can be called from an interrupt. |
| 2785 | * |
| 2786 | * A negative errno code is returned on a failure. A success does not |
| 2787 | * guarantee the frame will be transmitted as it may be dropped due |
| 2788 | * to congestion or traffic shaping. |
| 2789 | * |
| 2790 | * ----------------------------------------------------------------------------------- |
| 2791 | * I notice this method can also return errors from the queue disciplines, |
| 2792 | * including NET_XMIT_DROP, which is a positive value. So, errors can also |
| 2793 | * be positive. |
| 2794 | * |
| 2795 | * Regardless of the return value, the skb is consumed, so it is currently |
| 2796 | * difficult to retry a send to this method. (You can bump the ref count |
| 2797 | * before sending to hold a reference for retry if you are careful.) |
| 2798 | * |
| 2799 | * When calling this method, interrupts MUST be enabled. This is because |
| 2800 | * the BH enable code must have IRQs enabled so that it will not deadlock. |
| 2801 | * --BLG |
| 2802 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | int dev_queue_xmit(struct sk_buff *skb) |
| 2804 | { |
| 2805 | struct net_device *dev = skb->dev; |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 2806 | struct netdev_queue *txq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | struct Qdisc *q; |
| 2808 | int rc = -ENOMEM; |
| 2809 | |
Eric Dumazet | 6d1ccff | 2013-02-05 20:22:20 +0000 | [diff] [blame] | 2810 | skb_reset_mac_header(skb); |
| 2811 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2812 | /* Disable soft irqs for various locks below. Also |
| 2813 | * stops preemption for RCU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2814 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2815 | rcu_read_lock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2816 | |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 2817 | skb_update_prio(skb); |
| 2818 | |
Amerigo Wang | 8c4c49d | 2012-09-17 20:16:31 +0000 | [diff] [blame] | 2819 | txq = netdev_pick_tx(dev, skb); |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 2820 | q = rcu_dereference_bh(txq->qdisc); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2822 | #ifdef CONFIG_NET_CLS_ACT |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2823 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | #endif |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 2825 | trace_net_dev_queue(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2826 | if (q->enqueue) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2827 | rc = __dev_xmit_skb(skb, q, dev, txq); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2828 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2829 | } |
| 2830 | |
| 2831 | /* The device has no queue. Common case for software devices: |
| 2832 | loopback, all the sorts of tunnels... |
| 2833 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 2834 | Really, it is unlikely that netif_tx_lock protection is necessary |
| 2835 | here. (f.e. loopback and IP tunnels are clean ignoring statistics |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2836 | counters.) |
| 2837 | However, it is possible, that they rely on protection |
| 2838 | made by us here. |
| 2839 | |
| 2840 | Check this and shot the lock. It is not prone from deadlocks. |
| 2841 | Either shot noqueue qdisc, it is even simpler 8) |
| 2842 | */ |
| 2843 | if (dev->flags & IFF_UP) { |
| 2844 | int cpu = smp_processor_id(); /* ok because BHs are off */ |
| 2845 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2846 | if (txq->xmit_lock_owner != cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2847 | |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2848 | if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) |
| 2849 | goto recursion_alert; |
| 2850 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2851 | HARD_TX_LOCK(dev, txq, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2852 | |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 2853 | if (!netif_xmit_stopped(txq)) { |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2854 | __this_cpu_inc(xmit_recursion); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2855 | rc = dev_hard_start_xmit(skb, dev, txq); |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2856 | __this_cpu_dec(xmit_recursion); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2857 | if (dev_xmit_complete(rc)) { |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2858 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2859 | goto out; |
| 2860 | } |
| 2861 | } |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2862 | HARD_TX_UNLOCK(dev, txq); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 2863 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
| 2864 | dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2865 | } else { |
| 2866 | /* Recursion is detected! It is possible, |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2867 | * unfortunately |
| 2868 | */ |
| 2869 | recursion_alert: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 2870 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
| 2871 | dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2872 | } |
| 2873 | } |
| 2874 | |
| 2875 | rc = -ENETDOWN; |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2876 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2878 | kfree_skb(skb); |
| 2879 | return rc; |
| 2880 | out: |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2881 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | return rc; |
| 2883 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2884 | EXPORT_SYMBOL(dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | |
| 2886 | |
| 2887 | /*======================================================================= |
| 2888 | Receiver routines |
| 2889 | =======================================================================*/ |
| 2890 | |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2891 | int netdev_max_backlog __read_mostly = 1000; |
Eric Dumazet | c9e6bc6 | 2012-09-27 19:29:05 +0000 | [diff] [blame] | 2892 | EXPORT_SYMBOL(netdev_max_backlog); |
| 2893 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2894 | int netdev_tstamp_prequeue __read_mostly = 1; |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2895 | int netdev_budget __read_mostly = 300; |
| 2896 | int weight_p __read_mostly = 64; /* old backlog weight */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2897 | |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 2898 | /* Called with irq disabled */ |
| 2899 | static inline void ____napi_schedule(struct softnet_data *sd, |
| 2900 | struct napi_struct *napi) |
| 2901 | { |
| 2902 | list_add_tail(&napi->poll_list, &sd->poll_list); |
| 2903 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 2904 | } |
| 2905 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2906 | #ifdef CONFIG_RPS |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2907 | |
| 2908 | /* One global table that all flow-based protocols share. */ |
Eric Dumazet | 6e3f7fa | 2010-10-25 03:02:02 +0000 | [diff] [blame] | 2909 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2910 | EXPORT_SYMBOL(rps_sock_flow_table); |
| 2911 | |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 2912 | struct static_key rps_needed __read_mostly; |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 2913 | |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2914 | static struct rps_dev_flow * |
| 2915 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
| 2916 | struct rps_dev_flow *rflow, u16 next_cpu) |
| 2917 | { |
Ben Hutchings | 09994d1 | 2011-10-03 04:42:46 +0000 | [diff] [blame] | 2918 | if (next_cpu != RPS_NO_CPU) { |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2919 | #ifdef CONFIG_RFS_ACCEL |
| 2920 | struct netdev_rx_queue *rxqueue; |
| 2921 | struct rps_dev_flow_table *flow_table; |
| 2922 | struct rps_dev_flow *old_rflow; |
| 2923 | u32 flow_id; |
| 2924 | u16 rxq_index; |
| 2925 | int rc; |
| 2926 | |
| 2927 | /* Should we steer this flow to a different hardware queue? */ |
Ben Hutchings | 69a19ee | 2011-02-15 20:32:04 +0000 | [diff] [blame] | 2928 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
| 2929 | !(dev->features & NETIF_F_NTUPLE)) |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2930 | goto out; |
| 2931 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); |
| 2932 | if (rxq_index == skb_get_rx_queue(skb)) |
| 2933 | goto out; |
| 2934 | |
| 2935 | rxqueue = dev->_rx + rxq_index; |
| 2936 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 2937 | if (!flow_table) |
| 2938 | goto out; |
| 2939 | flow_id = skb->rxhash & flow_table->mask; |
| 2940 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
| 2941 | rxq_index, flow_id); |
| 2942 | if (rc < 0) |
| 2943 | goto out; |
| 2944 | old_rflow = rflow; |
| 2945 | rflow = &flow_table->flows[flow_id]; |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2946 | rflow->filter = rc; |
| 2947 | if (old_rflow->filter == rflow->filter) |
| 2948 | old_rflow->filter = RPS_NO_FILTER; |
| 2949 | out: |
| 2950 | #endif |
| 2951 | rflow->last_qtail = |
Ben Hutchings | 09994d1 | 2011-10-03 04:42:46 +0000 | [diff] [blame] | 2952 | per_cpu(softnet_data, next_cpu).input_queue_head; |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2953 | } |
| 2954 | |
Ben Hutchings | 09994d1 | 2011-10-03 04:42:46 +0000 | [diff] [blame] | 2955 | rflow->cpu = next_cpu; |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2956 | return rflow; |
| 2957 | } |
| 2958 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2959 | /* |
| 2960 | * get_rps_cpu is called from netif_receive_skb and returns the target |
| 2961 | * CPU from the RPS map of the receiving queue for a given skb. |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2962 | * rcu_read_lock must be held on entry. |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2963 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2964 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
| 2965 | struct rps_dev_flow **rflowp) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2966 | { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2967 | struct netdev_rx_queue *rxqueue; |
Eric Dumazet | 6e3f7fa | 2010-10-25 03:02:02 +0000 | [diff] [blame] | 2968 | struct rps_map *map; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2969 | struct rps_dev_flow_table *flow_table; |
| 2970 | struct rps_sock_flow_table *sock_flow_table; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2971 | int cpu = -1; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2972 | u16 tcpu; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2973 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2974 | if (skb_rx_queue_recorded(skb)) { |
| 2975 | u16 index = skb_get_rx_queue(skb); |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 2976 | if (unlikely(index >= dev->real_num_rx_queues)) { |
| 2977 | WARN_ONCE(dev->real_num_rx_queues > 1, |
| 2978 | "%s received packet on queue %u, but number " |
| 2979 | "of RX queues is %u\n", |
| 2980 | dev->name, index, dev->real_num_rx_queues); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2981 | goto done; |
| 2982 | } |
| 2983 | rxqueue = dev->_rx + index; |
| 2984 | } else |
| 2985 | rxqueue = dev->_rx; |
| 2986 | |
Eric Dumazet | 6e3f7fa | 2010-10-25 03:02:02 +0000 | [diff] [blame] | 2987 | map = rcu_dereference(rxqueue->rps_map); |
| 2988 | if (map) { |
Tom Herbert | 8587523 | 2011-01-31 16:23:42 -0800 | [diff] [blame] | 2989 | if (map->len == 1 && |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 2990 | !rcu_access_pointer(rxqueue->rps_flow_table)) { |
Changli Gao | 6febfca | 2010-09-03 23:12:37 +0000 | [diff] [blame] | 2991 | tcpu = map->cpus[0]; |
| 2992 | if (cpu_online(tcpu)) |
| 2993 | cpu = tcpu; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2994 | goto done; |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 2995 | } |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 2996 | } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2997 | goto done; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2998 | } |
| 2999 | |
Changli Gao | 2d47b45 | 2010-08-17 19:00:56 +0000 | [diff] [blame] | 3000 | skb_reset_network_header(skb); |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 3001 | if (!skb_get_rxhash(skb)) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3002 | goto done; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3003 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3004 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 3005 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
| 3006 | if (flow_table && sock_flow_table) { |
| 3007 | u16 next_cpu; |
| 3008 | struct rps_dev_flow *rflow; |
| 3009 | |
| 3010 | rflow = &flow_table->flows[skb->rxhash & flow_table->mask]; |
| 3011 | tcpu = rflow->cpu; |
| 3012 | |
| 3013 | next_cpu = sock_flow_table->ents[skb->rxhash & |
| 3014 | sock_flow_table->mask]; |
| 3015 | |
| 3016 | /* |
| 3017 | * If the desired CPU (where last recvmsg was done) is |
| 3018 | * different from current CPU (one in the rx-queue flow |
| 3019 | * table entry), switch if one of the following holds: |
| 3020 | * - Current CPU is unset (equal to RPS_NO_CPU). |
| 3021 | * - Current CPU is offline. |
| 3022 | * - The current CPU's queue tail has advanced beyond the |
| 3023 | * last packet that was enqueued using this table entry. |
| 3024 | * This guarantees that all previous packets for the flow |
| 3025 | * have been dequeued, thus preserving in order delivery. |
| 3026 | */ |
| 3027 | if (unlikely(tcpu != next_cpu) && |
| 3028 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || |
| 3029 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
Tom Herbert | baefa31 | 2012-11-16 09:04:15 +0000 | [diff] [blame] | 3030 | rflow->last_qtail)) >= 0)) { |
| 3031 | tcpu = next_cpu; |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 3032 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
Tom Herbert | baefa31 | 2012-11-16 09:04:15 +0000 | [diff] [blame] | 3033 | } |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 3034 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3035 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
| 3036 | *rflowp = rflow; |
| 3037 | cpu = tcpu; |
| 3038 | goto done; |
| 3039 | } |
| 3040 | } |
| 3041 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3042 | if (map) { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3043 | tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32]; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3044 | |
| 3045 | if (cpu_online(tcpu)) { |
| 3046 | cpu = tcpu; |
| 3047 | goto done; |
| 3048 | } |
| 3049 | } |
| 3050 | |
| 3051 | done: |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3052 | return cpu; |
| 3053 | } |
| 3054 | |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 3055 | #ifdef CONFIG_RFS_ACCEL |
| 3056 | |
| 3057 | /** |
| 3058 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed |
| 3059 | * @dev: Device on which the filter was set |
| 3060 | * @rxq_index: RX queue index |
| 3061 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() |
| 3062 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() |
| 3063 | * |
| 3064 | * Drivers that implement ndo_rx_flow_steer() should periodically call |
| 3065 | * this function for each installed filter and remove the filters for |
| 3066 | * which it returns %true. |
| 3067 | */ |
| 3068 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, |
| 3069 | u32 flow_id, u16 filter_id) |
| 3070 | { |
| 3071 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; |
| 3072 | struct rps_dev_flow_table *flow_table; |
| 3073 | struct rps_dev_flow *rflow; |
| 3074 | bool expire = true; |
| 3075 | int cpu; |
| 3076 | |
| 3077 | rcu_read_lock(); |
| 3078 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 3079 | if (flow_table && flow_id <= flow_table->mask) { |
| 3080 | rflow = &flow_table->flows[flow_id]; |
| 3081 | cpu = ACCESS_ONCE(rflow->cpu); |
| 3082 | if (rflow->filter == filter_id && cpu != RPS_NO_CPU && |
| 3083 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
| 3084 | rflow->last_qtail) < |
| 3085 | (int)(10 * flow_table->mask))) |
| 3086 | expire = false; |
| 3087 | } |
| 3088 | rcu_read_unlock(); |
| 3089 | return expire; |
| 3090 | } |
| 3091 | EXPORT_SYMBOL(rps_may_expire_flow); |
| 3092 | |
| 3093 | #endif /* CONFIG_RFS_ACCEL */ |
| 3094 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3095 | /* Called from hardirq (IPI) context */ |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3096 | static void rps_trigger_softirq(void *data) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3097 | { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3098 | struct softnet_data *sd = data; |
| 3099 | |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3100 | ____napi_schedule(sd, &sd->backlog); |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3101 | sd->received_rps++; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3102 | } |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3103 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3104 | #endif /* CONFIG_RPS */ |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3105 | |
| 3106 | /* |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3107 | * Check if this softnet_data structure is another cpu one |
| 3108 | * If yes, queue it to our IPI list and return 1 |
| 3109 | * If no, return 0 |
| 3110 | */ |
| 3111 | static int rps_ipi_queued(struct softnet_data *sd) |
| 3112 | { |
| 3113 | #ifdef CONFIG_RPS |
| 3114 | struct softnet_data *mysd = &__get_cpu_var(softnet_data); |
| 3115 | |
| 3116 | if (sd != mysd) { |
| 3117 | sd->rps_ipi_next = mysd->rps_ipi_list; |
| 3118 | mysd->rps_ipi_list = sd; |
| 3119 | |
| 3120 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 3121 | return 1; |
| 3122 | } |
| 3123 | #endif /* CONFIG_RPS */ |
| 3124 | return 0; |
| 3125 | } |
| 3126 | |
Willem de Bruijn | 99bbc70 | 2013-05-20 04:02:32 +0000 | [diff] [blame] | 3127 | #ifdef CONFIG_NET_FLOW_LIMIT |
| 3128 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); |
| 3129 | #endif |
| 3130 | |
| 3131 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) |
| 3132 | { |
| 3133 | #ifdef CONFIG_NET_FLOW_LIMIT |
| 3134 | struct sd_flow_limit *fl; |
| 3135 | struct softnet_data *sd; |
| 3136 | unsigned int old_flow, new_flow; |
| 3137 | |
| 3138 | if (qlen < (netdev_max_backlog >> 1)) |
| 3139 | return false; |
| 3140 | |
| 3141 | sd = &__get_cpu_var(softnet_data); |
| 3142 | |
| 3143 | rcu_read_lock(); |
| 3144 | fl = rcu_dereference(sd->flow_limit); |
| 3145 | if (fl) { |
| 3146 | new_flow = skb_get_rxhash(skb) & (fl->num_buckets - 1); |
| 3147 | old_flow = fl->history[fl->history_head]; |
| 3148 | fl->history[fl->history_head] = new_flow; |
| 3149 | |
| 3150 | fl->history_head++; |
| 3151 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; |
| 3152 | |
| 3153 | if (likely(fl->buckets[old_flow])) |
| 3154 | fl->buckets[old_flow]--; |
| 3155 | |
| 3156 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { |
| 3157 | fl->count++; |
| 3158 | rcu_read_unlock(); |
| 3159 | return true; |
| 3160 | } |
| 3161 | } |
| 3162 | rcu_read_unlock(); |
| 3163 | #endif |
| 3164 | return false; |
| 3165 | } |
| 3166 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3167 | /* |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3168 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog |
| 3169 | * queue (may be a remote CPU queue). |
| 3170 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3171 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
| 3172 | unsigned int *qtail) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3173 | { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3174 | struct softnet_data *sd; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3175 | unsigned long flags; |
Willem de Bruijn | 99bbc70 | 2013-05-20 04:02:32 +0000 | [diff] [blame] | 3176 | unsigned int qlen; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3177 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3178 | sd = &per_cpu(softnet_data, cpu); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3179 | |
| 3180 | local_irq_save(flags); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3181 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3182 | rps_lock(sd); |
Willem de Bruijn | 99bbc70 | 2013-05-20 04:02:32 +0000 | [diff] [blame] | 3183 | qlen = skb_queue_len(&sd->input_pkt_queue); |
| 3184 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3185 | if (skb_queue_len(&sd->input_pkt_queue)) { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3186 | enqueue: |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3187 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3188 | input_queue_tail_incr_save(sd, qtail); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3189 | rps_unlock(sd); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 3190 | local_irq_restore(flags); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3191 | return NET_RX_SUCCESS; |
| 3192 | } |
| 3193 | |
Eric Dumazet | ebda37c2 | 2010-05-06 23:51:21 +0000 | [diff] [blame] | 3194 | /* Schedule NAPI for backlog device |
| 3195 | * We can use non atomic operation since we own the queue lock |
| 3196 | */ |
| 3197 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3198 | if (!rps_ipi_queued(sd)) |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3199 | ____napi_schedule(sd, &sd->backlog); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3200 | } |
| 3201 | goto enqueue; |
| 3202 | } |
| 3203 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3204 | sd->dropped++; |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3205 | rps_unlock(sd); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3206 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3207 | local_irq_restore(flags); |
| 3208 | |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 3209 | atomic_long_inc(&skb->dev->rx_dropped); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3210 | kfree_skb(skb); |
| 3211 | return NET_RX_DROP; |
| 3212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3214 | /** |
| 3215 | * netif_rx - post buffer to the network code |
| 3216 | * @skb: buffer to post |
| 3217 | * |
| 3218 | * This function receives a packet from a device driver and queues it for |
| 3219 | * the upper (protocol) levels to process. It always succeeds. The buffer |
| 3220 | * may be dropped during processing for congestion control or by the |
| 3221 | * protocol layers. |
| 3222 | * |
| 3223 | * return values: |
| 3224 | * NET_RX_SUCCESS (no congestion) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3225 | * NET_RX_DROP (packet was dropped) |
| 3226 | * |
| 3227 | */ |
| 3228 | |
| 3229 | int netif_rx(struct sk_buff *skb) |
| 3230 | { |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3231 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3232 | |
| 3233 | /* if netpoll wants it, pretend we never saw it */ |
| 3234 | if (netpoll_rx(skb)) |
| 3235 | return NET_RX_DROP; |
| 3236 | |
Eric Dumazet | 588f033 | 2011-11-15 04:12:55 +0000 | [diff] [blame] | 3237 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3238 | |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 3239 | trace_netif_rx(skb); |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 3240 | #ifdef CONFIG_RPS |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 3241 | if (static_key_false(&rps_needed)) { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3242 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3243 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3244 | |
Changli Gao | cece194 | 2010-08-07 20:35:43 -0700 | [diff] [blame] | 3245 | preempt_disable(); |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3246 | rcu_read_lock(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3247 | |
| 3248 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3249 | if (cpu < 0) |
| 3250 | cpu = smp_processor_id(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3251 | |
| 3252 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 3253 | |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3254 | rcu_read_unlock(); |
Changli Gao | cece194 | 2010-08-07 20:35:43 -0700 | [diff] [blame] | 3255 | preempt_enable(); |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 3256 | } else |
| 3257 | #endif |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3258 | { |
| 3259 | unsigned int qtail; |
| 3260 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
| 3261 | put_cpu(); |
| 3262 | } |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3263 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3264 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3265 | EXPORT_SYMBOL(netif_rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3266 | |
| 3267 | int netif_rx_ni(struct sk_buff *skb) |
| 3268 | { |
| 3269 | int err; |
| 3270 | |
| 3271 | preempt_disable(); |
| 3272 | err = netif_rx(skb); |
| 3273 | if (local_softirq_pending()) |
| 3274 | do_softirq(); |
| 3275 | preempt_enable(); |
| 3276 | |
| 3277 | return err; |
| 3278 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3279 | EXPORT_SYMBOL(netif_rx_ni); |
| 3280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3281 | static void net_tx_action(struct softirq_action *h) |
| 3282 | { |
| 3283 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
| 3284 | |
| 3285 | if (sd->completion_queue) { |
| 3286 | struct sk_buff *clist; |
| 3287 | |
| 3288 | local_irq_disable(); |
| 3289 | clist = sd->completion_queue; |
| 3290 | sd->completion_queue = NULL; |
| 3291 | local_irq_enable(); |
| 3292 | |
| 3293 | while (clist) { |
| 3294 | struct sk_buff *skb = clist; |
| 3295 | clist = clist->next; |
| 3296 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 3297 | WARN_ON(atomic_read(&skb->users)); |
Koki Sanagi | 07dc22e | 2010-08-23 18:46:12 +0900 | [diff] [blame] | 3298 | trace_kfree_skb(skb, net_tx_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3299 | __kfree_skb(skb); |
| 3300 | } |
| 3301 | } |
| 3302 | |
| 3303 | if (sd->output_queue) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3304 | struct Qdisc *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3305 | |
| 3306 | local_irq_disable(); |
| 3307 | head = sd->output_queue; |
| 3308 | sd->output_queue = NULL; |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 3309 | sd->output_queue_tailp = &sd->output_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3310 | local_irq_enable(); |
| 3311 | |
| 3312 | while (head) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3313 | struct Qdisc *q = head; |
| 3314 | spinlock_t *root_lock; |
| 3315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3316 | head = head->next_sched; |
| 3317 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 3318 | root_lock = qdisc_lock(q); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3319 | if (spin_trylock(root_lock)) { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 3320 | smp_mb__before_clear_bit(); |
| 3321 | clear_bit(__QDISC_STATE_SCHED, |
| 3322 | &q->state); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3323 | qdisc_run(q); |
| 3324 | spin_unlock(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3325 | } else { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 3326 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 3327 | &q->state)) { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 3328 | __netif_reschedule(q); |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 3329 | } else { |
| 3330 | smp_mb__before_clear_bit(); |
| 3331 | clear_bit(__QDISC_STATE_SCHED, |
| 3332 | &q->state); |
| 3333 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3334 | } |
| 3335 | } |
| 3336 | } |
| 3337 | } |
| 3338 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3339 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
| 3340 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 3341 | /* This hook is defined here for ATM LANE */ |
| 3342 | int (*br_fdb_test_addr_hook)(struct net_device *dev, |
| 3343 | unsigned char *addr) __read_mostly; |
Stephen Hemminger | 4fb019a | 2009-09-11 11:50:08 -0700 | [diff] [blame] | 3344 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 3345 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3347 | #ifdef CONFIG_NET_CLS_ACT |
| 3348 | /* TODO: Maybe we should just force sch_ingress to be compiled in |
| 3349 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions |
| 3350 | * a compare and 2 stores extra right now if we dont have it on |
| 3351 | * but have CONFIG_NET_CLS_ACT |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3352 | * NOTE: This doesn't stop any functionality; if you dont have |
| 3353 | * the ingress scheduler, you just can't add policies on ingress. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3354 | * |
| 3355 | */ |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 3356 | static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3357 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3358 | struct net_device *dev = skb->dev; |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3359 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 3360 | int result = TC_ACT_OK; |
| 3361 | struct Qdisc *q; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3362 | |
Stephen Hemminger | de38483 | 2010-08-01 00:33:23 -0700 | [diff] [blame] | 3363 | if (unlikely(MAX_RED_LOOP < ttl++)) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 3364 | net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n", |
| 3365 | skb->skb_iif, dev->ifindex); |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3366 | return TC_ACT_SHOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3367 | } |
| 3368 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3369 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
| 3370 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); |
| 3371 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 3372 | q = rxq->qdisc; |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 3373 | if (q != &noop_qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 3374 | spin_lock(qdisc_lock(q)); |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 3375 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
| 3376 | result = qdisc_enqueue_root(skb, q); |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 3377 | spin_unlock(qdisc_lock(q)); |
| 3378 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3380 | return result; |
| 3381 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3382 | |
| 3383 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
| 3384 | struct packet_type **pt_prev, |
| 3385 | int *ret, struct net_device *orig_dev) |
| 3386 | { |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 3387 | struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue); |
| 3388 | |
| 3389 | if (!rxq || rxq->qdisc == &noop_qdisc) |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3390 | goto out; |
| 3391 | |
| 3392 | if (*pt_prev) { |
| 3393 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
| 3394 | *pt_prev = NULL; |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3395 | } |
| 3396 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 3397 | switch (ing_filter(skb, rxq)) { |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3398 | case TC_ACT_SHOT: |
| 3399 | case TC_ACT_STOLEN: |
| 3400 | kfree_skb(skb); |
| 3401 | return NULL; |
| 3402 | } |
| 3403 | |
| 3404 | out: |
| 3405 | skb->tc_verd = 0; |
| 3406 | return skb; |
| 3407 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3408 | #endif |
| 3409 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3410 | /** |
| 3411 | * netdev_rx_handler_register - register receive handler |
| 3412 | * @dev: device to register a handler for |
| 3413 | * @rx_handler: receive handler to register |
Jiri Pirko | 93e2c32 | 2010-06-10 03:34:59 +0000 | [diff] [blame] | 3414 | * @rx_handler_data: data pointer that is used by rx handler |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3415 | * |
| 3416 | * Register a receive hander for a device. This handler will then be |
| 3417 | * called from __netif_receive_skb. A negative errno code is returned |
| 3418 | * on a failure. |
| 3419 | * |
| 3420 | * The caller must hold the rtnl_mutex. |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3421 | * |
| 3422 | * For a general description of rx_handler, see enum rx_handler_result. |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3423 | */ |
| 3424 | int netdev_rx_handler_register(struct net_device *dev, |
Jiri Pirko | 93e2c32 | 2010-06-10 03:34:59 +0000 | [diff] [blame] | 3425 | rx_handler_func_t *rx_handler, |
| 3426 | void *rx_handler_data) |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3427 | { |
| 3428 | ASSERT_RTNL(); |
| 3429 | |
| 3430 | if (dev->rx_handler) |
| 3431 | return -EBUSY; |
| 3432 | |
Eric Dumazet | 00cfec3 | 2013-03-29 03:01:22 +0000 | [diff] [blame] | 3433 | /* Note: rx_handler_data must be set before rx_handler */ |
Jiri Pirko | 93e2c32 | 2010-06-10 03:34:59 +0000 | [diff] [blame] | 3434 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3435 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
| 3436 | |
| 3437 | return 0; |
| 3438 | } |
| 3439 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); |
| 3440 | |
| 3441 | /** |
| 3442 | * netdev_rx_handler_unregister - unregister receive handler |
| 3443 | * @dev: device to unregister a handler from |
| 3444 | * |
Kusanagi Kouichi | 166ec36 | 2013-03-18 02:59:52 +0000 | [diff] [blame] | 3445 | * Unregister a receive handler from a device. |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3446 | * |
| 3447 | * The caller must hold the rtnl_mutex. |
| 3448 | */ |
| 3449 | void netdev_rx_handler_unregister(struct net_device *dev) |
| 3450 | { |
| 3451 | |
| 3452 | ASSERT_RTNL(); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 3453 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
Eric Dumazet | 00cfec3 | 2013-03-29 03:01:22 +0000 | [diff] [blame] | 3454 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
| 3455 | * section has a guarantee to see a non NULL rx_handler_data |
| 3456 | * as well. |
| 3457 | */ |
| 3458 | synchronize_net(); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 3459 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3460 | } |
| 3461 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); |
| 3462 | |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3463 | /* |
| 3464 | * Limit the use of PFMEMALLOC reserves to those protocols that implement |
| 3465 | * the special handling of PFMEMALLOC skbs. |
| 3466 | */ |
| 3467 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) |
| 3468 | { |
| 3469 | switch (skb->protocol) { |
| 3470 | case __constant_htons(ETH_P_ARP): |
| 3471 | case __constant_htons(ETH_P_IP): |
| 3472 | case __constant_htons(ETH_P_IPV6): |
| 3473 | case __constant_htons(ETH_P_8021Q): |
Patrick McHardy | 8ad227f | 2013-04-19 02:04:31 +0000 | [diff] [blame] | 3474 | case __constant_htons(ETH_P_8021AD): |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3475 | return true; |
| 3476 | default: |
| 3477 | return false; |
| 3478 | } |
| 3479 | } |
| 3480 | |
David S. Miller | 9754e29 | 2013-02-14 15:57:38 -0500 | [diff] [blame] | 3481 | static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3482 | { |
| 3483 | struct packet_type *ptype, *pt_prev; |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3484 | rx_handler_func_t *rx_handler; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 3485 | struct net_device *orig_dev; |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3486 | struct net_device *null_or_dev; |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3487 | bool deliver_exact = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3488 | int ret = NET_RX_DROP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 3489 | __be16 type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3490 | |
Eric Dumazet | 588f033 | 2011-11-15 04:12:55 +0000 | [diff] [blame] | 3491 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
Eric Dumazet | 81bbb3d | 2009-09-30 16:42:42 -0700 | [diff] [blame] | 3492 | |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 3493 | trace_netif_receive_skb(skb); |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 3494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3495 | /* if we've gotten here through NAPI, check netpoll */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3496 | if (netpoll_receive_skb(skb)) |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3497 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3498 | |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 3499 | orig_dev = skb->dev; |
Jiri Pirko | 1765a57 | 2011-02-12 06:48:36 +0000 | [diff] [blame] | 3500 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 3501 | skb_reset_network_header(skb); |
Eric Dumazet | fda55ec | 2013-01-07 09:28:21 +0000 | [diff] [blame] | 3502 | if (!skb_transport_header_was_set(skb)) |
| 3503 | skb_reset_transport_header(skb); |
Jiri Pirko | 0b5c9db | 2011-06-10 06:56:58 +0000 | [diff] [blame] | 3504 | skb_reset_mac_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3505 | |
| 3506 | pt_prev = NULL; |
| 3507 | |
| 3508 | rcu_read_lock(); |
| 3509 | |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3510 | another_round: |
David S. Miller | b685817 | 2012-07-23 16:27:54 -0700 | [diff] [blame] | 3511 | skb->skb_iif = skb->dev->ifindex; |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3512 | |
| 3513 | __this_cpu_inc(softnet_data.processed); |
| 3514 | |
Patrick McHardy | 8ad227f | 2013-04-19 02:04:31 +0000 | [diff] [blame] | 3515 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
| 3516 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { |
Jiri Pirko | bcc6d47 | 2011-04-07 19:48:33 +0000 | [diff] [blame] | 3517 | skb = vlan_untag(skb); |
| 3518 | if (unlikely(!skb)) |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3519 | goto unlock; |
Jiri Pirko | bcc6d47 | 2011-04-07 19:48:33 +0000 | [diff] [blame] | 3520 | } |
| 3521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3522 | #ifdef CONFIG_NET_CLS_ACT |
| 3523 | if (skb->tc_verd & TC_NCLS) { |
| 3524 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); |
| 3525 | goto ncls; |
| 3526 | } |
| 3527 | #endif |
| 3528 | |
David S. Miller | 9754e29 | 2013-02-14 15:57:38 -0500 | [diff] [blame] | 3529 | if (pfmemalloc) |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3530 | goto skip_taps; |
| 3531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3532 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3533 | if (!ptype->dev || ptype->dev == skb->dev) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3534 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 3535 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3536 | pt_prev = ptype; |
| 3537 | } |
| 3538 | } |
| 3539 | |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3540 | skip_taps: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | #ifdef CONFIG_NET_CLS_ACT |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3542 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
| 3543 | if (!skb) |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3544 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3545 | ncls: |
| 3546 | #endif |
| 3547 | |
David S. Miller | 9754e29 | 2013-02-14 15:57:38 -0500 | [diff] [blame] | 3548 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3549 | goto drop; |
| 3550 | |
John Fastabend | 2425717 | 2011-10-10 09:16:41 +0000 | [diff] [blame] | 3551 | if (vlan_tx_tag_present(skb)) { |
| 3552 | if (pt_prev) { |
| 3553 | ret = deliver_skb(skb, pt_prev, orig_dev); |
| 3554 | pt_prev = NULL; |
| 3555 | } |
Florian Zumbiehl | 48cc32d3 | 2012-10-07 15:51:58 +0000 | [diff] [blame] | 3556 | if (vlan_do_receive(&skb)) |
John Fastabend | 2425717 | 2011-10-10 09:16:41 +0000 | [diff] [blame] | 3557 | goto another_round; |
| 3558 | else if (unlikely(!skb)) |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3559 | goto unlock; |
John Fastabend | 2425717 | 2011-10-10 09:16:41 +0000 | [diff] [blame] | 3560 | } |
| 3561 | |
Florian Zumbiehl | 48cc32d3 | 2012-10-07 15:51:58 +0000 | [diff] [blame] | 3562 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3563 | if (rx_handler) { |
| 3564 | if (pt_prev) { |
| 3565 | ret = deliver_skb(skb, pt_prev, orig_dev); |
| 3566 | pt_prev = NULL; |
| 3567 | } |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3568 | switch (rx_handler(&skb)) { |
| 3569 | case RX_HANDLER_CONSUMED: |
Cristian Bercaru | 3bc1b1a | 2013-03-08 07:03:38 +0000 | [diff] [blame] | 3570 | ret = NET_RX_SUCCESS; |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3571 | goto unlock; |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3572 | case RX_HANDLER_ANOTHER: |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3573 | goto another_round; |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3574 | case RX_HANDLER_EXACT: |
| 3575 | deliver_exact = true; |
| 3576 | case RX_HANDLER_PASS: |
| 3577 | break; |
| 3578 | default: |
| 3579 | BUG(); |
| 3580 | } |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3581 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3582 | |
Eric Dumazet | d4b812d | 2013-07-18 07:19:26 -0700 | [diff] [blame] | 3583 | if (unlikely(vlan_tx_tag_present(skb))) { |
| 3584 | if (vlan_tx_tag_get_id(skb)) |
| 3585 | skb->pkt_type = PACKET_OTHERHOST; |
| 3586 | /* Note: we might in the future use prio bits |
| 3587 | * and set skb->priority like in vlan_do_receive() |
| 3588 | * For the time being, just ignore Priority Code Point |
| 3589 | */ |
| 3590 | skb->vlan_tci = 0; |
| 3591 | } |
Florian Zumbiehl | 48cc32d3 | 2012-10-07 15:51:58 +0000 | [diff] [blame] | 3592 | |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3593 | /* deliver only exact match when indicated */ |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3594 | null_or_dev = deliver_exact ? skb->dev : NULL; |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 3595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3596 | type = skb->protocol; |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3597 | list_for_each_entry_rcu(ptype, |
| 3598 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3599 | if (ptype->type == type && |
Jiri Pirko | e3f48d3 | 2011-02-28 20:26:31 +0000 | [diff] [blame] | 3600 | (ptype->dev == null_or_dev || ptype->dev == skb->dev || |
| 3601 | ptype->dev == orig_dev)) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3602 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 3603 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3604 | pt_prev = ptype; |
| 3605 | } |
| 3606 | } |
| 3607 | |
| 3608 | if (pt_prev) { |
Michael S. Tsirkin | 1080e51 | 2012-07-20 09:23:17 +0000 | [diff] [blame] | 3609 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
Michael S. Tsirkin | 0e698bf | 2012-09-15 22:44:16 +0000 | [diff] [blame] | 3610 | goto drop; |
Michael S. Tsirkin | 1080e51 | 2012-07-20 09:23:17 +0000 | [diff] [blame] | 3611 | else |
| 3612 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3613 | } else { |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3614 | drop: |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 3615 | atomic_long_inc(&skb->dev->rx_dropped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3616 | kfree_skb(skb); |
| 3617 | /* Jamal, now you will not able to escape explaining |
| 3618 | * me how you were going to use this. :-) |
| 3619 | */ |
| 3620 | ret = NET_RX_DROP; |
| 3621 | } |
| 3622 | |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3623 | unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3624 | rcu_read_unlock(); |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 3625 | out: |
David S. Miller | 9754e29 | 2013-02-14 15:57:38 -0500 | [diff] [blame] | 3626 | return ret; |
| 3627 | } |
| 3628 | |
| 3629 | static int __netif_receive_skb(struct sk_buff *skb) |
| 3630 | { |
| 3631 | int ret; |
| 3632 | |
| 3633 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { |
| 3634 | unsigned long pflags = current->flags; |
| 3635 | |
| 3636 | /* |
| 3637 | * PFMEMALLOC skbs are special, they should |
| 3638 | * - be delivered to SOCK_MEMALLOC sockets only |
| 3639 | * - stay away from userspace |
| 3640 | * - have bounded memory usage |
| 3641 | * |
| 3642 | * Use PF_MEMALLOC as this saves us from propagating the allocation |
| 3643 | * context down to all allocation sites. |
| 3644 | */ |
| 3645 | current->flags |= PF_MEMALLOC; |
| 3646 | ret = __netif_receive_skb_core(skb, true); |
| 3647 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
| 3648 | } else |
| 3649 | ret = __netif_receive_skb_core(skb, false); |
| 3650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3651 | return ret; |
| 3652 | } |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3653 | |
| 3654 | /** |
| 3655 | * netif_receive_skb - process receive buffer from network |
| 3656 | * @skb: buffer to process |
| 3657 | * |
| 3658 | * netif_receive_skb() is the main receive data processing function. |
| 3659 | * It always succeeds. The buffer may be dropped during processing |
| 3660 | * for congestion control or by the protocol layers. |
| 3661 | * |
| 3662 | * This function may only be called from softirq context and interrupts |
| 3663 | * should be enabled. |
| 3664 | * |
| 3665 | * Return values (usually ignored): |
| 3666 | * NET_RX_SUCCESS: no congestion |
| 3667 | * NET_RX_DROP: packet was dropped |
| 3668 | */ |
| 3669 | int netif_receive_skb(struct sk_buff *skb) |
| 3670 | { |
Eric Dumazet | 588f033 | 2011-11-15 04:12:55 +0000 | [diff] [blame] | 3671 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3672 | |
Richard Cochran | c1f19b5 | 2010-07-17 08:49:36 +0000 | [diff] [blame] | 3673 | if (skb_defer_rx_timestamp(skb)) |
| 3674 | return NET_RX_SUCCESS; |
| 3675 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 3676 | #ifdef CONFIG_RPS |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 3677 | if (static_key_false(&rps_needed)) { |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3678 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
| 3679 | int cpu, ret; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3680 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3681 | rcu_read_lock(); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3682 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3683 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3684 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3685 | if (cpu >= 0) { |
| 3686 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 3687 | rcu_read_unlock(); |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 3688 | return ret; |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3689 | } |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 3690 | rcu_read_unlock(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3691 | } |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 3692 | #endif |
Eric Dumazet | adc9300 | 2011-11-17 03:13:26 +0000 | [diff] [blame] | 3693 | return __netif_receive_skb(skb); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3694 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3695 | EXPORT_SYMBOL(netif_receive_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3696 | |
Eric Dumazet | 8875127 | 2010-04-19 05:07:33 +0000 | [diff] [blame] | 3697 | /* Network device is going away, flush any packets still pending |
| 3698 | * Called with irqs disabled. |
| 3699 | */ |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 3700 | static void flush_backlog(void *arg) |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3701 | { |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 3702 | struct net_device *dev = arg; |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3703 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3704 | struct sk_buff *skb, *tmp; |
| 3705 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3706 | rps_lock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3707 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3708 | if (skb->dev == dev) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3709 | __skb_unlink(skb, &sd->input_pkt_queue); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3710 | kfree_skb(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3711 | input_queue_head_incr(sd); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3712 | } |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3713 | } |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3714 | rps_unlock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3715 | |
| 3716 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { |
| 3717 | if (skb->dev == dev) { |
| 3718 | __skb_unlink(skb, &sd->process_queue); |
| 3719 | kfree_skb(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3720 | input_queue_head_incr(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3721 | } |
| 3722 | } |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3723 | } |
| 3724 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3725 | static int napi_gro_complete(struct sk_buff *skb) |
| 3726 | { |
Vlad Yasevich | 22061d8 | 2012-11-15 08:49:11 +0000 | [diff] [blame] | 3727 | struct packet_offload *ptype; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3728 | __be16 type = skb->protocol; |
Vlad Yasevich | 22061d8 | 2012-11-15 08:49:11 +0000 | [diff] [blame] | 3729 | struct list_head *head = &offload_base; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3730 | int err = -ENOENT; |
| 3731 | |
Eric Dumazet | c3c7c25 | 2012-12-06 13:54:59 +0000 | [diff] [blame] | 3732 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
| 3733 | |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 3734 | if (NAPI_GRO_CB(skb)->count == 1) { |
| 3735 | skb_shinfo(skb)->gso_size = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3736 | goto out; |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 3737 | } |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3738 | |
| 3739 | rcu_read_lock(); |
| 3740 | list_for_each_entry_rcu(ptype, head, list) { |
Vlad Yasevich | f191a1d | 2012-11-15 08:49:23 +0000 | [diff] [blame] | 3741 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3742 | continue; |
| 3743 | |
Vlad Yasevich | f191a1d | 2012-11-15 08:49:23 +0000 | [diff] [blame] | 3744 | err = ptype->callbacks.gro_complete(skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3745 | break; |
| 3746 | } |
| 3747 | rcu_read_unlock(); |
| 3748 | |
| 3749 | if (err) { |
| 3750 | WARN_ON(&ptype->list == head); |
| 3751 | kfree_skb(skb); |
| 3752 | return NET_RX_SUCCESS; |
| 3753 | } |
| 3754 | |
| 3755 | out: |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3756 | return netif_receive_skb(skb); |
| 3757 | } |
| 3758 | |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 3759 | /* napi->gro_list contains packets ordered by age. |
| 3760 | * youngest packets at the head of it. |
| 3761 | * Complete skbs in reverse order to reduce latencies. |
| 3762 | */ |
| 3763 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3764 | { |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 3765 | struct sk_buff *skb, *prev = NULL; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3766 | |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 3767 | /* scan list and build reverse chain */ |
| 3768 | for (skb = napi->gro_list; skb != NULL; skb = skb->next) { |
| 3769 | skb->prev = prev; |
| 3770 | prev = skb; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3771 | } |
| 3772 | |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 3773 | for (skb = prev; skb; skb = prev) { |
| 3774 | skb->next = NULL; |
| 3775 | |
| 3776 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) |
| 3777 | return; |
| 3778 | |
| 3779 | prev = skb->prev; |
| 3780 | napi_gro_complete(skb); |
| 3781 | napi->gro_count--; |
| 3782 | } |
| 3783 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3784 | napi->gro_list = NULL; |
| 3785 | } |
Eric Dumazet | 86cac58 | 2010-08-31 18:25:32 +0000 | [diff] [blame] | 3786 | EXPORT_SYMBOL(napi_gro_flush); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3787 | |
Eric Dumazet | 89c5fa3 | 2012-12-10 13:28:16 +0000 | [diff] [blame] | 3788 | static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb) |
| 3789 | { |
| 3790 | struct sk_buff *p; |
| 3791 | unsigned int maclen = skb->dev->hard_header_len; |
| 3792 | |
| 3793 | for (p = napi->gro_list; p; p = p->next) { |
| 3794 | unsigned long diffs; |
| 3795 | |
| 3796 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
| 3797 | diffs |= p->vlan_tci ^ skb->vlan_tci; |
| 3798 | if (maclen == ETH_HLEN) |
| 3799 | diffs |= compare_ether_header(skb_mac_header(p), |
| 3800 | skb_gro_mac_header(skb)); |
| 3801 | else if (!diffs) |
| 3802 | diffs = memcmp(skb_mac_header(p), |
| 3803 | skb_gro_mac_header(skb), |
| 3804 | maclen); |
| 3805 | NAPI_GRO_CB(p)->same_flow = !diffs; |
| 3806 | NAPI_GRO_CB(p)->flush = 0; |
| 3807 | } |
| 3808 | } |
| 3809 | |
Rami Rosen | bb72882 | 2012-11-28 21:55:25 +0000 | [diff] [blame] | 3810 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3811 | { |
| 3812 | struct sk_buff **pp = NULL; |
Vlad Yasevich | 22061d8 | 2012-11-15 08:49:11 +0000 | [diff] [blame] | 3813 | struct packet_offload *ptype; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3814 | __be16 type = skb->protocol; |
Vlad Yasevich | 22061d8 | 2012-11-15 08:49:11 +0000 | [diff] [blame] | 3815 | struct list_head *head = &offload_base; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3816 | int same_flow; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3817 | enum gro_result ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3818 | |
Jarek Poplawski | ce9e76c | 2010-08-05 01:19:11 +0000 | [diff] [blame] | 3819 | if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb)) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3820 | goto normal; |
| 3821 | |
David S. Miller | 21dc330 | 2010-08-23 00:13:46 -0700 | [diff] [blame] | 3822 | if (skb_is_gso(skb) || skb_has_frag_list(skb)) |
Herbert Xu | f17f5c9 | 2009-01-14 14:36:12 -0800 | [diff] [blame] | 3823 | goto normal; |
| 3824 | |
Eric Dumazet | 89c5fa3 | 2012-12-10 13:28:16 +0000 | [diff] [blame] | 3825 | gro_list_prepare(napi, skb); |
| 3826 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3827 | rcu_read_lock(); |
| 3828 | list_for_each_entry_rcu(ptype, head, list) { |
Vlad Yasevich | f191a1d | 2012-11-15 08:49:23 +0000 | [diff] [blame] | 3829 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3830 | continue; |
| 3831 | |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3832 | skb_set_network_header(skb, skb_gro_offset(skb)); |
Eric Dumazet | efd9450 | 2013-02-14 17:31:48 +0000 | [diff] [blame] | 3833 | skb_reset_mac_len(skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3834 | NAPI_GRO_CB(skb)->same_flow = 0; |
| 3835 | NAPI_GRO_CB(skb)->flush = 0; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3836 | NAPI_GRO_CB(skb)->free = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3837 | |
Vlad Yasevich | f191a1d | 2012-11-15 08:49:23 +0000 | [diff] [blame] | 3838 | pp = ptype->callbacks.gro_receive(&napi->gro_list, skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3839 | break; |
| 3840 | } |
| 3841 | rcu_read_unlock(); |
| 3842 | |
| 3843 | if (&ptype->list == head) |
| 3844 | goto normal; |
| 3845 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3846 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3847 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3848 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3849 | if (pp) { |
| 3850 | struct sk_buff *nskb = *pp; |
| 3851 | |
| 3852 | *pp = nskb->next; |
| 3853 | nskb->next = NULL; |
| 3854 | napi_gro_complete(nskb); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3855 | napi->gro_count--; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3856 | } |
| 3857 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3858 | if (same_flow) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3859 | goto ok; |
| 3860 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3861 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3862 | goto normal; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3863 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3864 | napi->gro_count++; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3865 | NAPI_GRO_CB(skb)->count = 1; |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 3866 | NAPI_GRO_CB(skb)->age = jiffies; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3867 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3868 | skb->next = napi->gro_list; |
| 3869 | napi->gro_list = skb; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3870 | ret = GRO_HELD; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3871 | |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3872 | pull: |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3873 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
| 3874 | int grow = skb_gro_offset(skb) - skb_headlen(skb); |
| 3875 | |
| 3876 | BUG_ON(skb->end - skb->tail < grow); |
| 3877 | |
| 3878 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); |
| 3879 | |
| 3880 | skb->tail += grow; |
| 3881 | skb->data_len -= grow; |
| 3882 | |
| 3883 | skb_shinfo(skb)->frags[0].page_offset += grow; |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 3884 | skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow); |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3885 | |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 3886 | if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) { |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 3887 | skb_frag_unref(skb, 0); |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3888 | memmove(skb_shinfo(skb)->frags, |
| 3889 | skb_shinfo(skb)->frags + 1, |
Jarek Poplawski | e5093ae | 2010-08-11 02:02:10 +0000 | [diff] [blame] | 3890 | --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t)); |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3891 | } |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3892 | } |
| 3893 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3894 | ok: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3895 | return ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3896 | |
| 3897 | normal: |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3898 | ret = GRO_NORMAL; |
| 3899 | goto pull; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3900 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3901 | |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3902 | |
Rami Rosen | bb72882 | 2012-11-28 21:55:25 +0000 | [diff] [blame] | 3903 | static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3904 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3905 | switch (ret) { |
| 3906 | case GRO_NORMAL: |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3907 | if (netif_receive_skb(skb)) |
| 3908 | ret = GRO_DROP; |
| 3909 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3910 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3911 | case GRO_DROP: |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3912 | kfree_skb(skb); |
| 3913 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3914 | |
Eric Dumazet | daa8654 | 2012-04-19 07:07:40 +0000 | [diff] [blame] | 3915 | case GRO_MERGED_FREE: |
Eric Dumazet | d7e8883 | 2012-04-30 08:10:34 +0000 | [diff] [blame] | 3916 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
| 3917 | kmem_cache_free(skbuff_head_cache, skb); |
| 3918 | else |
| 3919 | __kfree_skb(skb); |
Eric Dumazet | daa8654 | 2012-04-19 07:07:40 +0000 | [diff] [blame] | 3920 | break; |
| 3921 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3922 | case GRO_HELD: |
| 3923 | case GRO_MERGED: |
| 3924 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3925 | } |
| 3926 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3927 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3928 | } |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3929 | |
Eric Dumazet | ca07e43 | 2012-10-06 22:28:06 +0000 | [diff] [blame] | 3930 | static void skb_gro_reset_offset(struct sk_buff *skb) |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3931 | { |
Eric Dumazet | ca07e43 | 2012-10-06 22:28:06 +0000 | [diff] [blame] | 3932 | const struct skb_shared_info *pinfo = skb_shinfo(skb); |
| 3933 | const skb_frag_t *frag0 = &pinfo->frags[0]; |
| 3934 | |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3935 | NAPI_GRO_CB(skb)->data_offset = 0; |
| 3936 | NAPI_GRO_CB(skb)->frag0 = NULL; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3937 | NAPI_GRO_CB(skb)->frag0_len = 0; |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3938 | |
Simon Horman | ced14f6 | 2013-05-28 20:34:25 +0000 | [diff] [blame] | 3939 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && |
Eric Dumazet | ca07e43 | 2012-10-06 22:28:06 +0000 | [diff] [blame] | 3940 | pinfo->nr_frags && |
| 3941 | !PageHighMem(skb_frag_page(frag0))) { |
| 3942 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); |
| 3943 | NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0); |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3944 | } |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3945 | } |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3946 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3947 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3948 | { |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3949 | skb_gro_reset_offset(skb); |
| 3950 | |
Eric Dumazet | 89c5fa3 | 2012-12-10 13:28:16 +0000 | [diff] [blame] | 3951 | return napi_skb_finish(dev_gro_receive(napi, skb), skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3952 | } |
| 3953 | EXPORT_SYMBOL(napi_gro_receive); |
| 3954 | |
stephen hemminger | d0c2b0d | 2010-10-19 07:12:10 +0000 | [diff] [blame] | 3955 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3956 | { |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3957 | __skb_pull(skb, skb_headlen(skb)); |
Eric Dumazet | 2a2a459 | 2012-03-21 06:58:03 +0000 | [diff] [blame] | 3958 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
| 3959 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); |
Jesse Gross | 3701e51 | 2010-10-20 13:56:06 +0000 | [diff] [blame] | 3960 | skb->vlan_tci = 0; |
Herbert Xu | 66c46d7 | 2011-01-29 20:44:54 -0800 | [diff] [blame] | 3961 | skb->dev = napi->dev; |
Andy Gospodarek | 6d152e2 | 2011-02-02 14:53:25 -0800 | [diff] [blame] | 3962 | skb->skb_iif = 0; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3963 | |
| 3964 | napi->skb = skb; |
| 3965 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3966 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3967 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3968 | { |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3969 | struct sk_buff *skb = napi->skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3970 | |
| 3971 | if (!skb) { |
Eric Dumazet | 89d71a6 | 2009-10-13 05:34:20 +0000 | [diff] [blame] | 3972 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
| 3973 | if (skb) |
| 3974 | napi->skb = skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3975 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3976 | return skb; |
| 3977 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3978 | EXPORT_SYMBOL(napi_get_frags); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3979 | |
Rami Rosen | bb72882 | 2012-11-28 21:55:25 +0000 | [diff] [blame] | 3980 | static gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3981 | gro_result_t ret) |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3982 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3983 | switch (ret) { |
| 3984 | case GRO_NORMAL: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3985 | case GRO_HELD: |
Ajit Khaparde | e76b69c | 2010-02-16 20:25:43 +0000 | [diff] [blame] | 3986 | skb->protocol = eth_type_trans(skb, skb->dev); |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3987 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3988 | if (ret == GRO_HELD) |
| 3989 | skb_gro_pull(skb, -ETH_HLEN); |
| 3990 | else if (netif_receive_skb(skb)) |
| 3991 | ret = GRO_DROP; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3992 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3993 | |
| 3994 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3995 | case GRO_MERGED_FREE: |
| 3996 | napi_reuse_skb(napi, skb); |
| 3997 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3998 | |
| 3999 | case GRO_MERGED: |
| 4000 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 4001 | } |
| 4002 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 4003 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 4004 | } |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 4005 | |
Eric Dumazet | 4adb9c4 | 2012-05-18 20:49:06 +0000 | [diff] [blame] | 4006 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 4007 | { |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 4008 | struct sk_buff *skb = napi->skb; |
| 4009 | struct ethhdr *eth; |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 4010 | unsigned int hlen; |
| 4011 | unsigned int off; |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 4012 | |
| 4013 | napi->skb = NULL; |
| 4014 | |
| 4015 | skb_reset_mac_header(skb); |
| 4016 | skb_gro_reset_offset(skb); |
| 4017 | |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 4018 | off = skb_gro_offset(skb); |
| 4019 | hlen = off + sizeof(*eth); |
| 4020 | eth = skb_gro_header_fast(skb, off); |
| 4021 | if (skb_gro_header_hard(skb, hlen)) { |
| 4022 | eth = skb_gro_header_slow(skb, hlen, off); |
| 4023 | if (unlikely(!eth)) { |
| 4024 | napi_reuse_skb(napi, skb); |
| 4025 | skb = NULL; |
| 4026 | goto out; |
| 4027 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 4028 | } |
| 4029 | |
| 4030 | skb_gro_pull(skb, sizeof(*eth)); |
| 4031 | |
| 4032 | /* |
| 4033 | * This works because the only protocols we care about don't require |
| 4034 | * special handling. We'll fix it up properly at the end. |
| 4035 | */ |
| 4036 | skb->protocol = eth->h_proto; |
| 4037 | |
| 4038 | out: |
| 4039 | return skb; |
| 4040 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 4041 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 4042 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 4043 | { |
| 4044 | struct sk_buff *skb = napi_frags_skb(napi); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 4045 | |
| 4046 | if (!skb) |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 4047 | return GRO_DROP; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 4048 | |
Eric Dumazet | 89c5fa3 | 2012-12-10 13:28:16 +0000 | [diff] [blame] | 4049 | return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 4050 | } |
| 4051 | EXPORT_SYMBOL(napi_gro_frags); |
| 4052 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 4053 | /* |
| 4054 | * net_rps_action sends any pending IPI's for rps. |
| 4055 | * Note: called with local irq disabled, but exits with local irq enabled. |
| 4056 | */ |
| 4057 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) |
| 4058 | { |
| 4059 | #ifdef CONFIG_RPS |
| 4060 | struct softnet_data *remsd = sd->rps_ipi_list; |
| 4061 | |
| 4062 | if (remsd) { |
| 4063 | sd->rps_ipi_list = NULL; |
| 4064 | |
| 4065 | local_irq_enable(); |
| 4066 | |
| 4067 | /* Send pending IPI's to kick RPS processing on remote cpus. */ |
| 4068 | while (remsd) { |
| 4069 | struct softnet_data *next = remsd->rps_ipi_next; |
| 4070 | |
| 4071 | if (cpu_online(remsd->cpu)) |
| 4072 | __smp_call_function_single(remsd->cpu, |
| 4073 | &remsd->csd, 0); |
| 4074 | remsd = next; |
| 4075 | } |
| 4076 | } else |
| 4077 | #endif |
| 4078 | local_irq_enable(); |
| 4079 | } |
| 4080 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4081 | static int process_backlog(struct napi_struct *napi, int quota) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4082 | { |
| 4083 | int work = 0; |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 4084 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4085 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 4086 | #ifdef CONFIG_RPS |
| 4087 | /* Check if we have pending ipi, its better to send them now, |
| 4088 | * not waiting net_rx_action() end. |
| 4089 | */ |
| 4090 | if (sd->rps_ipi_list) { |
| 4091 | local_irq_disable(); |
| 4092 | net_rps_action_and_irq_enable(sd); |
| 4093 | } |
| 4094 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4095 | napi->weight = weight_p; |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4096 | local_irq_disable(); |
| 4097 | while (work < quota) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4098 | struct sk_buff *skb; |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4099 | unsigned int qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4100 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4101 | while ((skb = __skb_dequeue(&sd->process_queue))) { |
Eric Dumazet | e400827 | 2010-04-05 15:42:39 -0700 | [diff] [blame] | 4102 | local_irq_enable(); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4103 | __netif_receive_skb(skb); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4104 | local_irq_disable(); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 4105 | input_queue_head_incr(sd); |
| 4106 | if (++work >= quota) { |
| 4107 | local_irq_enable(); |
| 4108 | return work; |
| 4109 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4110 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4111 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4112 | rps_lock(sd); |
| 4113 | qlen = skb_queue_len(&sd->input_pkt_queue); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 4114 | if (qlen) |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4115 | skb_queue_splice_tail_init(&sd->input_pkt_queue, |
| 4116 | &sd->process_queue); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 4117 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4118 | if (qlen < quota - work) { |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 4119 | /* |
| 4120 | * Inline a custom version of __napi_complete(). |
| 4121 | * only current cpu owns and manipulates this napi, |
| 4122 | * and NAPI_STATE_SCHED is the only possible flag set on backlog. |
| 4123 | * we can use a plain write instead of clear_bit(), |
| 4124 | * and we dont need an smp_mb() memory barrier. |
| 4125 | */ |
| 4126 | list_del(&napi->poll_list); |
| 4127 | napi->state = 0; |
| 4128 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 4129 | quota = work + qlen; |
| 4130 | } |
| 4131 | rps_unlock(sd); |
| 4132 | } |
| 4133 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4134 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4135 | return work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4136 | } |
| 4137 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4138 | /** |
| 4139 | * __napi_schedule - schedule for receive |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 4140 | * @n: entry to schedule |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4141 | * |
| 4142 | * The entry's receive function will be scheduled to run |
| 4143 | */ |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 4144 | void __napi_schedule(struct napi_struct *n) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4145 | { |
| 4146 | unsigned long flags; |
| 4147 | |
| 4148 | local_irq_save(flags); |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 4149 | ____napi_schedule(&__get_cpu_var(softnet_data), n); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4150 | local_irq_restore(flags); |
| 4151 | } |
| 4152 | EXPORT_SYMBOL(__napi_schedule); |
| 4153 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4154 | void __napi_complete(struct napi_struct *n) |
| 4155 | { |
| 4156 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); |
| 4157 | BUG_ON(n->gro_list); |
| 4158 | |
| 4159 | list_del(&n->poll_list); |
| 4160 | smp_mb__before_clear_bit(); |
| 4161 | clear_bit(NAPI_STATE_SCHED, &n->state); |
| 4162 | } |
| 4163 | EXPORT_SYMBOL(__napi_complete); |
| 4164 | |
| 4165 | void napi_complete(struct napi_struct *n) |
| 4166 | { |
| 4167 | unsigned long flags; |
| 4168 | |
| 4169 | /* |
| 4170 | * don't let napi dequeue from the cpu poll list |
| 4171 | * just in case its running on a different cpu |
| 4172 | */ |
| 4173 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) |
| 4174 | return; |
| 4175 | |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 4176 | napi_gro_flush(n, false); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4177 | local_irq_save(flags); |
| 4178 | __napi_complete(n); |
| 4179 | local_irq_restore(flags); |
| 4180 | } |
| 4181 | EXPORT_SYMBOL(napi_complete); |
| 4182 | |
Eliezer Tamir | af12fa6 | 2013-06-10 11:39:41 +0300 | [diff] [blame] | 4183 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
| 4184 | struct napi_struct *napi_by_id(unsigned int napi_id) |
| 4185 | { |
| 4186 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); |
| 4187 | struct napi_struct *napi; |
| 4188 | |
| 4189 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) |
| 4190 | if (napi->napi_id == napi_id) |
| 4191 | return napi; |
| 4192 | |
| 4193 | return NULL; |
| 4194 | } |
| 4195 | EXPORT_SYMBOL_GPL(napi_by_id); |
| 4196 | |
| 4197 | void napi_hash_add(struct napi_struct *napi) |
| 4198 | { |
| 4199 | if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) { |
| 4200 | |
| 4201 | spin_lock(&napi_hash_lock); |
| 4202 | |
| 4203 | /* 0 is not a valid id, we also skip an id that is taken |
| 4204 | * we expect both events to be extremely rare |
| 4205 | */ |
| 4206 | napi->napi_id = 0; |
| 4207 | while (!napi->napi_id) { |
| 4208 | napi->napi_id = ++napi_gen_id; |
| 4209 | if (napi_by_id(napi->napi_id)) |
| 4210 | napi->napi_id = 0; |
| 4211 | } |
| 4212 | |
| 4213 | hlist_add_head_rcu(&napi->napi_hash_node, |
| 4214 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); |
| 4215 | |
| 4216 | spin_unlock(&napi_hash_lock); |
| 4217 | } |
| 4218 | } |
| 4219 | EXPORT_SYMBOL_GPL(napi_hash_add); |
| 4220 | |
| 4221 | /* Warning : caller is responsible to make sure rcu grace period |
| 4222 | * is respected before freeing memory containing @napi |
| 4223 | */ |
| 4224 | void napi_hash_del(struct napi_struct *napi) |
| 4225 | { |
| 4226 | spin_lock(&napi_hash_lock); |
| 4227 | |
| 4228 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) |
| 4229 | hlist_del_rcu(&napi->napi_hash_node); |
| 4230 | |
| 4231 | spin_unlock(&napi_hash_lock); |
| 4232 | } |
| 4233 | EXPORT_SYMBOL_GPL(napi_hash_del); |
| 4234 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4235 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
| 4236 | int (*poll)(struct napi_struct *, int), int weight) |
| 4237 | { |
| 4238 | INIT_LIST_HEAD(&napi->poll_list); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 4239 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4240 | napi->gro_list = NULL; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 4241 | napi->skb = NULL; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4242 | napi->poll = poll; |
Eric Dumazet | 82dc3c6 | 2013-03-05 15:57:22 +0000 | [diff] [blame] | 4243 | if (weight > NAPI_POLL_WEIGHT) |
| 4244 | pr_err_once("netif_napi_add() called with weight %d on device %s\n", |
| 4245 | weight, dev->name); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4246 | napi->weight = weight; |
| 4247 | list_add(&napi->dev_list, &dev->napi_list); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4248 | napi->dev = dev; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 4249 | #ifdef CONFIG_NETPOLL |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4250 | spin_lock_init(&napi->poll_lock); |
| 4251 | napi->poll_owner = -1; |
| 4252 | #endif |
| 4253 | set_bit(NAPI_STATE_SCHED, &napi->state); |
| 4254 | } |
| 4255 | EXPORT_SYMBOL(netif_napi_add); |
| 4256 | |
| 4257 | void netif_napi_del(struct napi_struct *napi) |
| 4258 | { |
| 4259 | struct sk_buff *skb, *next; |
| 4260 | |
Peter P Waskiewicz Jr | d7b0663 | 2008-12-26 01:35:35 -0800 | [diff] [blame] | 4261 | list_del_init(&napi->dev_list); |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 4262 | napi_free_frags(napi); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4263 | |
| 4264 | for (skb = napi->gro_list; skb; skb = next) { |
| 4265 | next = skb->next; |
| 4266 | skb->next = NULL; |
| 4267 | kfree_skb(skb); |
| 4268 | } |
| 4269 | |
| 4270 | napi->gro_list = NULL; |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 4271 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 4272 | } |
| 4273 | EXPORT_SYMBOL(netif_napi_del); |
| 4274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4275 | static void net_rx_action(struct softirq_action *h) |
| 4276 | { |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 4277 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 4278 | unsigned long time_limit = jiffies + 2; |
Stephen Hemminger | 51b0bde | 2005-06-23 20:14:40 -0700 | [diff] [blame] | 4279 | int budget = netdev_budget; |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 4280 | void *have; |
| 4281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4282 | local_irq_disable(); |
| 4283 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 4284 | while (!list_empty(&sd->poll_list)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4285 | struct napi_struct *n; |
| 4286 | int work, weight; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4287 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4288 | /* If softirq window is exhuasted then punt. |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 4289 | * Allow this to run for 2 jiffies since which will allow |
| 4290 | * an average latency of 1.5/HZ. |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4291 | */ |
Eric Dumazet | d1f41b6 | 2013-03-05 07:15:13 +0000 | [diff] [blame] | 4292 | if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4293 | goto softnet_break; |
| 4294 | |
| 4295 | local_irq_enable(); |
| 4296 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4297 | /* Even though interrupts have been re-enabled, this |
| 4298 | * access is safe because interrupts can only add new |
| 4299 | * entries to the tail of this list, and only ->poll() |
| 4300 | * calls can remove this head entry from the list. |
| 4301 | */ |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 4302 | n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4303 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4304 | have = netpoll_poll_lock(n); |
| 4305 | |
| 4306 | weight = n->weight; |
| 4307 | |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 4308 | /* This NAPI_STATE_SCHED test is for avoiding a race |
| 4309 | * with netpoll's poll_napi(). Only the entity which |
| 4310 | * obtains the lock and sees NAPI_STATE_SCHED set will |
| 4311 | * actually make the ->poll() call. Therefore we avoid |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4312 | * accidentally calling ->poll() when NAPI is not scheduled. |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 4313 | */ |
| 4314 | work = 0; |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 4315 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 4316 | work = n->poll(n, weight); |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 4317 | trace_napi_poll(n); |
| 4318 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4319 | |
| 4320 | WARN_ON_ONCE(work > weight); |
| 4321 | |
| 4322 | budget -= work; |
| 4323 | |
| 4324 | local_irq_disable(); |
| 4325 | |
| 4326 | /* Drivers must not modify the NAPI state if they |
| 4327 | * consume the entire weight. In such cases this code |
| 4328 | * still "owns" the NAPI instance and therefore can |
| 4329 | * move the instance around on the list at-will. |
| 4330 | */ |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 4331 | if (unlikely(work == weight)) { |
Herbert Xu | ff780cd | 2009-06-26 19:27:04 -0700 | [diff] [blame] | 4332 | if (unlikely(napi_disable_pending(n))) { |
| 4333 | local_irq_enable(); |
| 4334 | napi_complete(n); |
| 4335 | local_irq_disable(); |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 4336 | } else { |
| 4337 | if (n->gro_list) { |
| 4338 | /* flush too old packets |
| 4339 | * If HZ < 1000, flush all packets. |
| 4340 | */ |
| 4341 | local_irq_enable(); |
| 4342 | napi_gro_flush(n, HZ >= 1000); |
| 4343 | local_irq_disable(); |
| 4344 | } |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 4345 | list_move_tail(&n->poll_list, &sd->poll_list); |
Eric Dumazet | 2e71a6f | 2012-10-06 08:08:49 +0000 | [diff] [blame] | 4346 | } |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 4347 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4348 | |
| 4349 | netpoll_poll_unlock(have); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4350 | } |
| 4351 | out: |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 4352 | net_rps_action_and_irq_enable(sd); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 4353 | |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 4354 | #ifdef CONFIG_NET_DMA |
| 4355 | /* |
| 4356 | * There may not be any more sk_buffs coming right now, so push |
| 4357 | * any pending DMA copies to hardware |
| 4358 | */ |
Dan Williams | 2ba0562 | 2009-01-06 11:38:14 -0700 | [diff] [blame] | 4359 | dma_issue_pending_all(); |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 4360 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 4361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4362 | return; |
| 4363 | |
| 4364 | softnet_break: |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4365 | sd->time_squeeze++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4366 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 4367 | goto out; |
| 4368 | } |
| 4369 | |
Veaceslav Falico | aa9d856 | 2013-08-28 23:25:04 +0200 | [diff] [blame] | 4370 | struct netdev_adjacent { |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4371 | struct net_device *dev; |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4372 | |
| 4373 | /* upper master flag, there can only be one master device per list */ |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4374 | bool master; |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4375 | |
| 4376 | /* indicates that this dev is our first-level lower/upper device */ |
| 4377 | bool neighbour; |
| 4378 | |
| 4379 | /* counter for the number of times this device was added to us */ |
| 4380 | u16 ref_nr; |
| 4381 | |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4382 | struct list_head list; |
| 4383 | struct rcu_head rcu; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4384 | }; |
| 4385 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4386 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev, |
| 4387 | struct net_device *adj_dev, |
| 4388 | bool upper) |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4389 | { |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4390 | struct netdev_adjacent *adj; |
| 4391 | struct list_head *dev_list; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4392 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4393 | dev_list = upper ? &dev->upper_dev_list : &dev->lower_dev_list; |
| 4394 | |
| 4395 | list_for_each_entry(adj, dev_list, list) { |
| 4396 | if (adj->dev == adj_dev) |
| 4397 | return adj; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4398 | } |
| 4399 | return NULL; |
| 4400 | } |
| 4401 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4402 | static inline struct netdev_adjacent *__netdev_find_upper(struct net_device *dev, |
| 4403 | struct net_device *udev) |
| 4404 | { |
| 4405 | return __netdev_find_adj(dev, udev, true); |
| 4406 | } |
| 4407 | |
| 4408 | static inline struct netdev_adjacent *__netdev_find_lower(struct net_device *dev, |
| 4409 | struct net_device *ldev) |
| 4410 | { |
| 4411 | return __netdev_find_adj(dev, ldev, false); |
| 4412 | } |
| 4413 | |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4414 | /** |
| 4415 | * netdev_has_upper_dev - Check if device is linked to an upper device |
| 4416 | * @dev: device |
| 4417 | * @upper_dev: upper device to check |
| 4418 | * |
| 4419 | * Find out if a device is linked to specified upper device and return true |
| 4420 | * in case it is. Note that this checks only immediate upper device, |
| 4421 | * not through a complete stack of devices. The caller must hold the RTNL lock. |
| 4422 | */ |
| 4423 | bool netdev_has_upper_dev(struct net_device *dev, |
| 4424 | struct net_device *upper_dev) |
| 4425 | { |
| 4426 | ASSERT_RTNL(); |
| 4427 | |
| 4428 | return __netdev_find_upper(dev, upper_dev); |
| 4429 | } |
| 4430 | EXPORT_SYMBOL(netdev_has_upper_dev); |
| 4431 | |
| 4432 | /** |
| 4433 | * netdev_has_any_upper_dev - Check if device is linked to some device |
| 4434 | * @dev: device |
| 4435 | * |
| 4436 | * Find out if a device is linked to an upper device and return true in case |
| 4437 | * it is. The caller must hold the RTNL lock. |
| 4438 | */ |
| 4439 | bool netdev_has_any_upper_dev(struct net_device *dev) |
| 4440 | { |
| 4441 | ASSERT_RTNL(); |
| 4442 | |
| 4443 | return !list_empty(&dev->upper_dev_list); |
| 4444 | } |
| 4445 | EXPORT_SYMBOL(netdev_has_any_upper_dev); |
| 4446 | |
| 4447 | /** |
| 4448 | * netdev_master_upper_dev_get - Get master upper device |
| 4449 | * @dev: device |
| 4450 | * |
| 4451 | * Find a master upper device and return pointer to it or NULL in case |
| 4452 | * it's not there. The caller must hold the RTNL lock. |
| 4453 | */ |
| 4454 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) |
| 4455 | { |
Veaceslav Falico | aa9d856 | 2013-08-28 23:25:04 +0200 | [diff] [blame] | 4456 | struct netdev_adjacent *upper; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4457 | |
| 4458 | ASSERT_RTNL(); |
| 4459 | |
| 4460 | if (list_empty(&dev->upper_dev_list)) |
| 4461 | return NULL; |
| 4462 | |
| 4463 | upper = list_first_entry(&dev->upper_dev_list, |
Veaceslav Falico | aa9d856 | 2013-08-28 23:25:04 +0200 | [diff] [blame] | 4464 | struct netdev_adjacent, list); |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4465 | if (likely(upper->master)) |
| 4466 | return upper->dev; |
| 4467 | return NULL; |
| 4468 | } |
| 4469 | EXPORT_SYMBOL(netdev_master_upper_dev_get); |
| 4470 | |
Veaceslav Falico | 48311f4 | 2013-08-28 23:25:07 +0200 | [diff] [blame] | 4471 | /* netdev_upper_get_next_dev_rcu - Get the next dev from upper list |
| 4472 | * @dev: device |
| 4473 | * @iter: list_head ** of the current position |
| 4474 | * |
| 4475 | * Gets the next device from the dev's upper list, starting from iter |
| 4476 | * position. The caller must hold RCU read lock. |
| 4477 | */ |
| 4478 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, |
| 4479 | struct list_head **iter) |
| 4480 | { |
| 4481 | struct netdev_adjacent *upper; |
| 4482 | |
| 4483 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 4484 | |
| 4485 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); |
| 4486 | |
| 4487 | if (&upper->list == &dev->upper_dev_list) |
| 4488 | return NULL; |
| 4489 | |
| 4490 | *iter = &upper->list; |
| 4491 | |
| 4492 | return upper->dev; |
| 4493 | } |
| 4494 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); |
| 4495 | |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4496 | /** |
| 4497 | * netdev_master_upper_dev_get_rcu - Get master upper device |
| 4498 | * @dev: device |
| 4499 | * |
| 4500 | * Find a master upper device and return pointer to it or NULL in case |
| 4501 | * it's not there. The caller must hold the RCU read lock. |
| 4502 | */ |
| 4503 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) |
| 4504 | { |
Veaceslav Falico | aa9d856 | 2013-08-28 23:25:04 +0200 | [diff] [blame] | 4505 | struct netdev_adjacent *upper; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4506 | |
| 4507 | upper = list_first_or_null_rcu(&dev->upper_dev_list, |
Veaceslav Falico | aa9d856 | 2013-08-28 23:25:04 +0200 | [diff] [blame] | 4508 | struct netdev_adjacent, list); |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4509 | if (upper && likely(upper->master)) |
| 4510 | return upper->dev; |
| 4511 | return NULL; |
| 4512 | } |
| 4513 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); |
| 4514 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4515 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
| 4516 | struct net_device *adj_dev, |
| 4517 | bool neighbour, bool master, |
| 4518 | bool upper) |
| 4519 | { |
| 4520 | struct netdev_adjacent *adj; |
| 4521 | |
| 4522 | adj = __netdev_find_adj(dev, adj_dev, upper); |
| 4523 | |
| 4524 | if (adj) { |
| 4525 | BUG_ON(neighbour); |
| 4526 | adj->ref_nr++; |
| 4527 | return 0; |
| 4528 | } |
| 4529 | |
| 4530 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); |
| 4531 | if (!adj) |
| 4532 | return -ENOMEM; |
| 4533 | |
| 4534 | adj->dev = adj_dev; |
| 4535 | adj->master = master; |
| 4536 | adj->neighbour = neighbour; |
| 4537 | adj->ref_nr = 1; |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4538 | |
| 4539 | dev_hold(adj_dev); |
| 4540 | pr_debug("dev_hold for %s, because of %s link added from %s to %s\n", |
| 4541 | adj_dev->name, upper ? "upper" : "lower", dev->name, |
| 4542 | adj_dev->name); |
| 4543 | |
| 4544 | if (!upper) { |
| 4545 | list_add_tail_rcu(&adj->list, &dev->lower_dev_list); |
| 4546 | return 0; |
| 4547 | } |
| 4548 | |
| 4549 | /* Ensure that master upper link is always the first item in list. */ |
| 4550 | if (master) |
| 4551 | list_add_rcu(&adj->list, &dev->upper_dev_list); |
| 4552 | else |
| 4553 | list_add_tail_rcu(&adj->list, &dev->upper_dev_list); |
| 4554 | |
| 4555 | return 0; |
| 4556 | } |
| 4557 | |
| 4558 | static inline int __netdev_upper_dev_insert(struct net_device *dev, |
| 4559 | struct net_device *udev, |
| 4560 | bool master, bool neighbour) |
| 4561 | { |
| 4562 | return __netdev_adjacent_dev_insert(dev, udev, neighbour, master, |
| 4563 | true); |
| 4564 | } |
| 4565 | |
| 4566 | static inline int __netdev_lower_dev_insert(struct net_device *dev, |
| 4567 | struct net_device *ldev, |
| 4568 | bool neighbour) |
| 4569 | { |
| 4570 | return __netdev_adjacent_dev_insert(dev, ldev, neighbour, false, |
| 4571 | false); |
| 4572 | } |
| 4573 | |
| 4574 | void __netdev_adjacent_dev_remove(struct net_device *dev, |
| 4575 | struct net_device *adj_dev, bool upper) |
| 4576 | { |
| 4577 | struct netdev_adjacent *adj; |
| 4578 | |
| 4579 | if (upper) |
| 4580 | adj = __netdev_find_upper(dev, adj_dev); |
| 4581 | else |
| 4582 | adj = __netdev_find_lower(dev, adj_dev); |
| 4583 | |
| 4584 | if (!adj) |
| 4585 | BUG(); |
| 4586 | |
| 4587 | if (adj->ref_nr > 1) { |
| 4588 | adj->ref_nr--; |
| 4589 | return; |
| 4590 | } |
| 4591 | |
| 4592 | list_del_rcu(&adj->list); |
| 4593 | pr_debug("dev_put for %s, because of %s link removed from %s to %s\n", |
| 4594 | adj_dev->name, upper ? "upper" : "lower", dev->name, |
| 4595 | adj_dev->name); |
| 4596 | dev_put(adj_dev); |
| 4597 | kfree_rcu(adj, rcu); |
| 4598 | } |
| 4599 | |
| 4600 | static inline void __netdev_upper_dev_remove(struct net_device *dev, |
| 4601 | struct net_device *udev) |
| 4602 | { |
| 4603 | return __netdev_adjacent_dev_remove(dev, udev, true); |
| 4604 | } |
| 4605 | |
| 4606 | static inline void __netdev_lower_dev_remove(struct net_device *dev, |
| 4607 | struct net_device *ldev) |
| 4608 | { |
| 4609 | return __netdev_adjacent_dev_remove(dev, ldev, false); |
| 4610 | } |
| 4611 | |
| 4612 | int __netdev_adjacent_dev_insert_link(struct net_device *dev, |
| 4613 | struct net_device *upper_dev, |
| 4614 | bool master, bool neighbour) |
| 4615 | { |
| 4616 | int ret; |
| 4617 | |
| 4618 | ret = __netdev_upper_dev_insert(dev, upper_dev, master, neighbour); |
| 4619 | if (ret) |
| 4620 | return ret; |
| 4621 | |
| 4622 | ret = __netdev_lower_dev_insert(upper_dev, dev, neighbour); |
| 4623 | if (ret) { |
| 4624 | __netdev_upper_dev_remove(dev, upper_dev); |
| 4625 | return ret; |
| 4626 | } |
| 4627 | |
| 4628 | return 0; |
| 4629 | } |
| 4630 | |
| 4631 | static inline int __netdev_adjacent_dev_link(struct net_device *dev, |
| 4632 | struct net_device *udev) |
| 4633 | { |
| 4634 | return __netdev_adjacent_dev_insert_link(dev, udev, false, false); |
| 4635 | } |
| 4636 | |
| 4637 | static inline int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
| 4638 | struct net_device *udev, |
| 4639 | bool master) |
| 4640 | { |
| 4641 | return __netdev_adjacent_dev_insert_link(dev, udev, master, true); |
| 4642 | } |
| 4643 | |
| 4644 | void __netdev_adjacent_dev_unlink(struct net_device *dev, |
| 4645 | struct net_device *upper_dev) |
| 4646 | { |
| 4647 | __netdev_upper_dev_remove(dev, upper_dev); |
| 4648 | __netdev_lower_dev_remove(upper_dev, dev); |
| 4649 | } |
| 4650 | |
| 4651 | |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4652 | static int __netdev_upper_dev_link(struct net_device *dev, |
| 4653 | struct net_device *upper_dev, bool master) |
| 4654 | { |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4655 | struct netdev_adjacent *i, *j, *to_i, *to_j; |
| 4656 | int ret = 0; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4657 | |
| 4658 | ASSERT_RTNL(); |
| 4659 | |
| 4660 | if (dev == upper_dev) |
| 4661 | return -EBUSY; |
| 4662 | |
| 4663 | /* To prevent loops, check if dev is not upper device to upper_dev. */ |
Veaceslav Falico | 620f318 | 2013-08-28 23:25:06 +0200 | [diff] [blame] | 4664 | if (__netdev_find_upper(upper_dev, dev)) |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4665 | return -EBUSY; |
| 4666 | |
| 4667 | if (__netdev_find_upper(dev, upper_dev)) |
| 4668 | return -EEXIST; |
| 4669 | |
| 4670 | if (master && netdev_master_upper_dev_get(dev)) |
| 4671 | return -EBUSY; |
| 4672 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4673 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, master); |
| 4674 | if (ret) |
| 4675 | return ret; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4676 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4677 | /* Now that we linked these devs, make all the upper_dev's |
| 4678 | * upper_dev_list visible to every dev's lower_dev_list and vice |
| 4679 | * versa, and don't forget the devices itself. All of these |
| 4680 | * links are non-neighbours. |
| 4681 | */ |
| 4682 | list_for_each_entry(i, &upper_dev->upper_dev_list, list) { |
| 4683 | list_for_each_entry(j, &dev->lower_dev_list, list) { |
| 4684 | ret = __netdev_adjacent_dev_link(i->dev, j->dev); |
| 4685 | if (ret) |
| 4686 | goto rollback_mesh; |
| 4687 | } |
| 4688 | } |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4689 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4690 | /* add dev to every upper_dev's upper device */ |
| 4691 | list_for_each_entry(i, &upper_dev->upper_dev_list, list) { |
| 4692 | ret = __netdev_adjacent_dev_link(dev, i->dev); |
| 4693 | if (ret) |
| 4694 | goto rollback_upper_mesh; |
| 4695 | } |
| 4696 | |
| 4697 | /* add upper_dev to every dev's lower device */ |
| 4698 | list_for_each_entry(i, &dev->lower_dev_list, list) { |
| 4699 | ret = __netdev_adjacent_dev_link(i->dev, upper_dev); |
| 4700 | if (ret) |
| 4701 | goto rollback_lower_mesh; |
| 4702 | } |
| 4703 | |
Jiri Pirko | 42e52bf | 2013-05-25 04:12:10 +0000 | [diff] [blame] | 4704 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4705 | return 0; |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4706 | |
| 4707 | rollback_lower_mesh: |
| 4708 | to_i = i; |
| 4709 | list_for_each_entry(i, &dev->lower_dev_list, list) { |
| 4710 | if (i == to_i) |
| 4711 | break; |
| 4712 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); |
| 4713 | } |
| 4714 | |
| 4715 | i = NULL; |
| 4716 | |
| 4717 | rollback_upper_mesh: |
| 4718 | to_i = i; |
| 4719 | list_for_each_entry(i, &upper_dev->upper_dev_list, list) { |
| 4720 | if (i == to_i) |
| 4721 | break; |
| 4722 | __netdev_adjacent_dev_unlink(dev, i->dev); |
| 4723 | } |
| 4724 | |
| 4725 | i = j = NULL; |
| 4726 | |
| 4727 | rollback_mesh: |
| 4728 | to_i = i; |
| 4729 | to_j = j; |
| 4730 | list_for_each_entry(i, &dev->lower_dev_list, list) { |
| 4731 | list_for_each_entry(j, &upper_dev->upper_dev_list, list) { |
| 4732 | if (i == to_i && j == to_j) |
| 4733 | break; |
| 4734 | __netdev_adjacent_dev_unlink(i->dev, j->dev); |
| 4735 | } |
| 4736 | if (i == to_i) |
| 4737 | break; |
| 4738 | } |
| 4739 | |
| 4740 | __netdev_adjacent_dev_unlink(dev, upper_dev); |
| 4741 | |
| 4742 | return ret; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4743 | } |
| 4744 | |
| 4745 | /** |
| 4746 | * netdev_upper_dev_link - Add a link to the upper device |
| 4747 | * @dev: device |
| 4748 | * @upper_dev: new upper device |
| 4749 | * |
| 4750 | * Adds a link to device which is upper to this one. The caller must hold |
| 4751 | * the RTNL lock. On a failure a negative errno code is returned. |
| 4752 | * On success the reference counts are adjusted and the function |
| 4753 | * returns zero. |
| 4754 | */ |
| 4755 | int netdev_upper_dev_link(struct net_device *dev, |
| 4756 | struct net_device *upper_dev) |
| 4757 | { |
| 4758 | return __netdev_upper_dev_link(dev, upper_dev, false); |
| 4759 | } |
| 4760 | EXPORT_SYMBOL(netdev_upper_dev_link); |
| 4761 | |
| 4762 | /** |
| 4763 | * netdev_master_upper_dev_link - Add a master link to the upper device |
| 4764 | * @dev: device |
| 4765 | * @upper_dev: new upper device |
| 4766 | * |
| 4767 | * Adds a link to device which is upper to this one. In this case, only |
| 4768 | * one master upper device can be linked, although other non-master devices |
| 4769 | * might be linked as well. The caller must hold the RTNL lock. |
| 4770 | * On a failure a negative errno code is returned. On success the reference |
| 4771 | * counts are adjusted and the function returns zero. |
| 4772 | */ |
| 4773 | int netdev_master_upper_dev_link(struct net_device *dev, |
| 4774 | struct net_device *upper_dev) |
| 4775 | { |
| 4776 | return __netdev_upper_dev_link(dev, upper_dev, true); |
| 4777 | } |
| 4778 | EXPORT_SYMBOL(netdev_master_upper_dev_link); |
| 4779 | |
| 4780 | /** |
| 4781 | * netdev_upper_dev_unlink - Removes a link to upper device |
| 4782 | * @dev: device |
| 4783 | * @upper_dev: new upper device |
| 4784 | * |
| 4785 | * Removes a link to device which is upper to this one. The caller must hold |
| 4786 | * the RTNL lock. |
| 4787 | */ |
| 4788 | void netdev_upper_dev_unlink(struct net_device *dev, |
| 4789 | struct net_device *upper_dev) |
| 4790 | { |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4791 | struct netdev_adjacent *i, *j; |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4792 | ASSERT_RTNL(); |
| 4793 | |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 4794 | __netdev_adjacent_dev_unlink(dev, upper_dev); |
| 4795 | |
| 4796 | /* Here is the tricky part. We must remove all dev's lower |
| 4797 | * devices from all upper_dev's upper devices and vice |
| 4798 | * versa, to maintain the graph relationship. |
| 4799 | */ |
| 4800 | list_for_each_entry(i, &dev->lower_dev_list, list) |
| 4801 | list_for_each_entry(j, &upper_dev->upper_dev_list, list) |
| 4802 | __netdev_adjacent_dev_unlink(i->dev, j->dev); |
| 4803 | |
| 4804 | /* remove also the devices itself from lower/upper device |
| 4805 | * list |
| 4806 | */ |
| 4807 | list_for_each_entry(i, &dev->lower_dev_list, list) |
| 4808 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); |
| 4809 | |
| 4810 | list_for_each_entry(i, &upper_dev->upper_dev_list, list) |
| 4811 | __netdev_adjacent_dev_unlink(dev, i->dev); |
| 4812 | |
Jiri Pirko | 42e52bf | 2013-05-25 04:12:10 +0000 | [diff] [blame] | 4813 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 4814 | } |
| 4815 | EXPORT_SYMBOL(netdev_upper_dev_unlink); |
| 4816 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4817 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
| 4818 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4819 | const struct net_device_ops *ops = dev->netdev_ops; |
| 4820 | |
| 4821 | if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags) |
| 4822 | ops->ndo_change_rx_flags(dev, flags); |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4823 | } |
| 4824 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4825 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4826 | { |
Eric Dumazet | b536db9 | 2011-11-30 21:42:26 +0000 | [diff] [blame] | 4827 | unsigned int old_flags = dev->flags; |
Eric W. Biederman | d04a48b | 2012-05-23 17:01:57 -0600 | [diff] [blame] | 4828 | kuid_t uid; |
| 4829 | kgid_t gid; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4830 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4831 | ASSERT_RTNL(); |
| 4832 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4833 | dev->flags |= IFF_PROMISC; |
| 4834 | dev->promiscuity += inc; |
| 4835 | if (dev->promiscuity == 0) { |
| 4836 | /* |
| 4837 | * Avoid overflow. |
| 4838 | * If inc causes overflow, untouch promisc and return error. |
| 4839 | */ |
| 4840 | if (inc < 0) |
| 4841 | dev->flags &= ~IFF_PROMISC; |
| 4842 | else { |
| 4843 | dev->promiscuity -= inc; |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 4844 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
| 4845 | dev->name); |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4846 | return -EOVERFLOW; |
| 4847 | } |
| 4848 | } |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4849 | if (dev->flags != old_flags) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 4850 | pr_info("device %s %s promiscuous mode\n", |
| 4851 | dev->name, |
| 4852 | dev->flags & IFF_PROMISC ? "entered" : "left"); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4853 | if (audit_enabled) { |
| 4854 | current_uid_gid(&uid, &gid); |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 4855 | audit_log(current->audit_context, GFP_ATOMIC, |
| 4856 | AUDIT_ANOM_PROMISCUOUS, |
| 4857 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", |
| 4858 | dev->name, (dev->flags & IFF_PROMISC), |
| 4859 | (old_flags & IFF_PROMISC), |
Eric W. Biederman | e1760bd | 2012-09-10 22:39:43 -0700 | [diff] [blame] | 4860 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
Eric W. Biederman | d04a48b | 2012-05-23 17:01:57 -0600 | [diff] [blame] | 4861 | from_kuid(&init_user_ns, uid), |
| 4862 | from_kgid(&init_user_ns, gid), |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 4863 | audit_get_sessionid(current)); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4864 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4865 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4866 | dev_change_rx_flags(dev, IFF_PROMISC); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4867 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4868 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4869 | } |
| 4870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4871 | /** |
| 4872 | * dev_set_promiscuity - update promiscuity count on a device |
| 4873 | * @dev: device |
| 4874 | * @inc: modifier |
| 4875 | * |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 4876 | * Add or remove promiscuity from a device. While the count in the device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4877 | * remains above zero the interface remains promiscuous. Once it hits zero |
| 4878 | * the device reverts back to normal filtering operation. A negative inc |
| 4879 | * value is used to drop promiscuity on the device. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4880 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4881 | */ |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4882 | int dev_set_promiscuity(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4883 | { |
Eric Dumazet | b536db9 | 2011-11-30 21:42:26 +0000 | [diff] [blame] | 4884 | unsigned int old_flags = dev->flags; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4885 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4886 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4887 | err = __dev_set_promiscuity(dev, inc); |
Patrick McHardy | 4b5a698 | 2008-07-06 15:49:08 -0700 | [diff] [blame] | 4888 | if (err < 0) |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4889 | return err; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4890 | if (dev->flags != old_flags) |
| 4891 | dev_set_rx_mode(dev); |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4892 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4893 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4894 | EXPORT_SYMBOL(dev_set_promiscuity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4895 | |
| 4896 | /** |
| 4897 | * dev_set_allmulti - update allmulti count on a device |
| 4898 | * @dev: device |
| 4899 | * @inc: modifier |
| 4900 | * |
| 4901 | * Add or remove reception of all multicast frames to a device. While the |
| 4902 | * count in the device remains above zero the interface remains listening |
| 4903 | * to all interfaces. Once it hits zero the device reverts back to normal |
| 4904 | * filtering operation. A negative @inc value is used to drop the counter |
| 4905 | * when releasing a resource needing all multicasts. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4906 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4907 | */ |
| 4908 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4909 | int dev_set_allmulti(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4910 | { |
Eric Dumazet | b536db9 | 2011-11-30 21:42:26 +0000 | [diff] [blame] | 4911 | unsigned int old_flags = dev->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4912 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4913 | ASSERT_RTNL(); |
| 4914 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4915 | dev->flags |= IFF_ALLMULTI; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4916 | dev->allmulti += inc; |
| 4917 | if (dev->allmulti == 0) { |
| 4918 | /* |
| 4919 | * Avoid overflow. |
| 4920 | * If inc causes overflow, untouch allmulti and return error. |
| 4921 | */ |
| 4922 | if (inc < 0) |
| 4923 | dev->flags &= ~IFF_ALLMULTI; |
| 4924 | else { |
| 4925 | dev->allmulti -= inc; |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 4926 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
| 4927 | dev->name); |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4928 | return -EOVERFLOW; |
| 4929 | } |
| 4930 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4931 | if (dev->flags ^ old_flags) { |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4932 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4933 | dev_set_rx_mode(dev); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4934 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4935 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4936 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4937 | EXPORT_SYMBOL(dev_set_allmulti); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4938 | |
| 4939 | /* |
| 4940 | * Upload unicast and multicast address lists to device and |
| 4941 | * configure RX filtering. When the device doesn't support unicast |
Joe Perches | 53ccaae | 2007-12-20 14:02:06 -0800 | [diff] [blame] | 4942 | * filtering it is put in promiscuous mode while unicast addresses |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4943 | * are present. |
| 4944 | */ |
| 4945 | void __dev_set_rx_mode(struct net_device *dev) |
| 4946 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4947 | const struct net_device_ops *ops = dev->netdev_ops; |
| 4948 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4949 | /* dev_open will call this function so the list will stay sane. */ |
| 4950 | if (!(dev->flags&IFF_UP)) |
| 4951 | return; |
| 4952 | |
| 4953 | if (!netif_device_present(dev)) |
YOSHIFUJI Hideaki | 40b77c9 | 2007-07-19 10:43:23 +0900 | [diff] [blame] | 4954 | return; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4955 | |
Jiri Pirko | 0178934 | 2011-08-16 06:29:00 +0000 | [diff] [blame] | 4956 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4957 | /* Unicast addresses changes may only happen under the rtnl, |
| 4958 | * therefore calling __dev_set_promiscuity here is safe. |
| 4959 | */ |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4960 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4961 | __dev_set_promiscuity(dev, 1); |
Joe Perches | 2d348d1 | 2011-07-25 16:17:35 -0700 | [diff] [blame] | 4962 | dev->uc_promisc = true; |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4963 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4964 | __dev_set_promiscuity(dev, -1); |
Joe Perches | 2d348d1 | 2011-07-25 16:17:35 -0700 | [diff] [blame] | 4965 | dev->uc_promisc = false; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4966 | } |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4967 | } |
Jiri Pirko | 0178934 | 2011-08-16 06:29:00 +0000 | [diff] [blame] | 4968 | |
| 4969 | if (ops->ndo_set_rx_mode) |
| 4970 | ops->ndo_set_rx_mode(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4971 | } |
| 4972 | |
| 4973 | void dev_set_rx_mode(struct net_device *dev) |
| 4974 | { |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4975 | netif_addr_lock_bh(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4976 | __dev_set_rx_mode(dev); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4977 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4978 | } |
| 4979 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4980 | /** |
| 4981 | * dev_get_flags - get flags reported to userspace |
| 4982 | * @dev: device |
| 4983 | * |
| 4984 | * Get the combination of flag bits exported through APIs to userspace. |
| 4985 | */ |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 4986 | unsigned int dev_get_flags(const struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4987 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 4988 | unsigned int flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4989 | |
| 4990 | flags = (dev->flags & ~(IFF_PROMISC | |
| 4991 | IFF_ALLMULTI | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4992 | IFF_RUNNING | |
| 4993 | IFF_LOWER_UP | |
| 4994 | IFF_DORMANT)) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4995 | (dev->gflags & (IFF_PROMISC | |
| 4996 | IFF_ALLMULTI)); |
| 4997 | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4998 | if (netif_running(dev)) { |
| 4999 | if (netif_oper_up(dev)) |
| 5000 | flags |= IFF_RUNNING; |
| 5001 | if (netif_carrier_ok(dev)) |
| 5002 | flags |= IFF_LOWER_UP; |
| 5003 | if (netif_dormant(dev)) |
| 5004 | flags |= IFF_DORMANT; |
| 5005 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5006 | |
| 5007 | return flags; |
| 5008 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5009 | EXPORT_SYMBOL(dev_get_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5010 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5011 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5012 | { |
Eric Dumazet | b536db9 | 2011-11-30 21:42:26 +0000 | [diff] [blame] | 5013 | unsigned int old_flags = dev->flags; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5014 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5015 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 5016 | ASSERT_RTNL(); |
| 5017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5018 | /* |
| 5019 | * Set the flags on our device. |
| 5020 | */ |
| 5021 | |
| 5022 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | |
| 5023 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | |
| 5024 | IFF_AUTOMEDIA)) | |
| 5025 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | |
| 5026 | IFF_ALLMULTI)); |
| 5027 | |
| 5028 | /* |
| 5029 | * Load in the correct multicast list now the flags have changed. |
| 5030 | */ |
| 5031 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 5032 | if ((old_flags ^ flags) & IFF_MULTICAST) |
| 5033 | dev_change_rx_flags(dev, IFF_MULTICAST); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 5034 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 5035 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5036 | |
| 5037 | /* |
| 5038 | * Have we downed the interface. We handle IFF_UP ourselves |
| 5039 | * according to user attempts to set it, rather than blindly |
| 5040 | * setting it. |
| 5041 | */ |
| 5042 | |
| 5043 | ret = 0; |
| 5044 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5045 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5046 | |
| 5047 | if (!ret) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 5048 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5049 | } |
| 5050 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5051 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5052 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
| 5053 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5054 | dev->gflags ^= IFF_PROMISC; |
| 5055 | dev_set_promiscuity(dev, inc); |
| 5056 | } |
| 5057 | |
| 5058 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI |
| 5059 | is important. Some (broken) drivers set IFF_PROMISC, when |
| 5060 | IFF_ALLMULTI is requested not asking us and not reporting. |
| 5061 | */ |
| 5062 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5063 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
| 5064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5065 | dev->gflags ^= IFF_ALLMULTI; |
| 5066 | dev_set_allmulti(dev, inc); |
| 5067 | } |
| 5068 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5069 | return ret; |
| 5070 | } |
| 5071 | |
| 5072 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags) |
| 5073 | { |
| 5074 | unsigned int changes = dev->flags ^ old_flags; |
| 5075 | |
| 5076 | if (changes & IFF_UP) { |
| 5077 | if (dev->flags & IFF_UP) |
| 5078 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 5079 | else |
| 5080 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 5081 | } |
| 5082 | |
| 5083 | if (dev->flags & IFF_UP && |
Jiri Pirko | be9efd3 | 2013-05-28 01:30:22 +0000 | [diff] [blame] | 5084 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
| 5085 | struct netdev_notifier_change_info change_info; |
| 5086 | |
| 5087 | change_info.flags_changed = changes; |
| 5088 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, |
| 5089 | &change_info.info); |
| 5090 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5091 | } |
| 5092 | |
| 5093 | /** |
| 5094 | * dev_change_flags - change device settings |
| 5095 | * @dev: device |
| 5096 | * @flags: device state flags |
| 5097 | * |
| 5098 | * Change settings on device based state flags. The flags are |
| 5099 | * in the userspace exported format. |
| 5100 | */ |
Eric Dumazet | b536db9 | 2011-11-30 21:42:26 +0000 | [diff] [blame] | 5101 | int dev_change_flags(struct net_device *dev, unsigned int flags) |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5102 | { |
Eric Dumazet | b536db9 | 2011-11-30 21:42:26 +0000 | [diff] [blame] | 5103 | int ret; |
| 5104 | unsigned int changes, old_flags = dev->flags; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5105 | |
| 5106 | ret = __dev_change_flags(dev, flags); |
| 5107 | if (ret < 0) |
| 5108 | return ret; |
| 5109 | |
| 5110 | changes = old_flags ^ dev->flags; |
Thomas Graf | 7c355f5 | 2007-06-05 16:03:03 -0700 | [diff] [blame] | 5111 | if (changes) |
| 5112 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5113 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 5114 | __dev_notify_flags(dev, old_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5115 | return ret; |
| 5116 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5117 | EXPORT_SYMBOL(dev_change_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5118 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5119 | /** |
| 5120 | * dev_set_mtu - Change maximum transfer unit |
| 5121 | * @dev: device |
| 5122 | * @new_mtu: new transfer unit |
| 5123 | * |
| 5124 | * Change the maximum transfer size of the network device. |
| 5125 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5126 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
| 5127 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5128 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5129 | int err; |
| 5130 | |
| 5131 | if (new_mtu == dev->mtu) |
| 5132 | return 0; |
| 5133 | |
| 5134 | /* MTU must be positive. */ |
| 5135 | if (new_mtu < 0) |
| 5136 | return -EINVAL; |
| 5137 | |
| 5138 | if (!netif_device_present(dev)) |
| 5139 | return -ENODEV; |
| 5140 | |
| 5141 | err = 0; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5142 | if (ops->ndo_change_mtu) |
| 5143 | err = ops->ndo_change_mtu(dev, new_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5144 | else |
| 5145 | dev->mtu = new_mtu; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5146 | |
Jiri Pirko | e3d8fab | 2012-12-03 01:16:32 +0000 | [diff] [blame] | 5147 | if (!err) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5148 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5149 | return err; |
| 5150 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5151 | EXPORT_SYMBOL(dev_set_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5152 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5153 | /** |
Vlad Dogaru | cbda10f | 2011-01-13 23:38:30 +0000 | [diff] [blame] | 5154 | * dev_set_group - Change group this device belongs to |
| 5155 | * @dev: device |
| 5156 | * @new_group: group this device should belong to |
| 5157 | */ |
| 5158 | void dev_set_group(struct net_device *dev, int new_group) |
| 5159 | { |
| 5160 | dev->group = new_group; |
| 5161 | } |
| 5162 | EXPORT_SYMBOL(dev_set_group); |
| 5163 | |
| 5164 | /** |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5165 | * dev_set_mac_address - Change Media Access Control Address |
| 5166 | * @dev: device |
| 5167 | * @sa: new address |
| 5168 | * |
| 5169 | * Change the hardware (MAC) address of the device |
| 5170 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5171 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
| 5172 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5173 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5174 | int err; |
| 5175 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5176 | if (!ops->ndo_set_mac_address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5177 | return -EOPNOTSUPP; |
| 5178 | if (sa->sa_family != dev->type) |
| 5179 | return -EINVAL; |
| 5180 | if (!netif_device_present(dev)) |
| 5181 | return -ENODEV; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5182 | err = ops->ndo_set_mac_address(dev, sa); |
Jiri Pirko | f652151 | 2013-01-01 03:30:14 +0000 | [diff] [blame] | 5183 | if (err) |
| 5184 | return err; |
Jiri Pirko | fbdeca2 | 2013-01-01 03:30:16 +0000 | [diff] [blame] | 5185 | dev->addr_assign_type = NET_ADDR_SET; |
Jiri Pirko | f652151 | 2013-01-01 03:30:14 +0000 | [diff] [blame] | 5186 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
Theodore Ts'o | 7bf2357 | 2012-07-04 21:23:25 -0400 | [diff] [blame] | 5187 | add_device_randomness(dev->dev_addr, dev->addr_len); |
Jiri Pirko | f652151 | 2013-01-01 03:30:14 +0000 | [diff] [blame] | 5188 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5189 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5190 | EXPORT_SYMBOL(dev_set_mac_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5191 | |
Jiri Pirko | 4bf84c3 | 2012-12-27 23:49:37 +0000 | [diff] [blame] | 5192 | /** |
| 5193 | * dev_change_carrier - Change device carrier |
| 5194 | * @dev: device |
Randy Dunlap | 691b3b7 | 2013-03-04 12:32:43 +0000 | [diff] [blame] | 5195 | * @new_carrier: new value |
Jiri Pirko | 4bf84c3 | 2012-12-27 23:49:37 +0000 | [diff] [blame] | 5196 | * |
| 5197 | * Change device carrier |
| 5198 | */ |
| 5199 | int dev_change_carrier(struct net_device *dev, bool new_carrier) |
| 5200 | { |
| 5201 | const struct net_device_ops *ops = dev->netdev_ops; |
| 5202 | |
| 5203 | if (!ops->ndo_change_carrier) |
| 5204 | return -EOPNOTSUPP; |
| 5205 | if (!netif_device_present(dev)) |
| 5206 | return -ENODEV; |
| 5207 | return ops->ndo_change_carrier(dev, new_carrier); |
| 5208 | } |
| 5209 | EXPORT_SYMBOL(dev_change_carrier); |
| 5210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5211 | /** |
Jiri Pirko | 66b52b0 | 2013-07-29 18:16:49 +0200 | [diff] [blame] | 5212 | * dev_get_phys_port_id - Get device physical port ID |
| 5213 | * @dev: device |
| 5214 | * @ppid: port ID |
| 5215 | * |
| 5216 | * Get device physical port ID |
| 5217 | */ |
| 5218 | int dev_get_phys_port_id(struct net_device *dev, |
| 5219 | struct netdev_phys_port_id *ppid) |
| 5220 | { |
| 5221 | const struct net_device_ops *ops = dev->netdev_ops; |
| 5222 | |
| 5223 | if (!ops->ndo_get_phys_port_id) |
| 5224 | return -EOPNOTSUPP; |
| 5225 | return ops->ndo_get_phys_port_id(dev, ppid); |
| 5226 | } |
| 5227 | EXPORT_SYMBOL(dev_get_phys_port_id); |
| 5228 | |
| 5229 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5230 | * dev_new_index - allocate an ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 5231 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5232 | * |
| 5233 | * Returns a suitable unique value for a new device interface |
| 5234 | * number. The caller must hold the rtnl semaphore or the |
| 5235 | * dev_base_lock to be sure it remains unique. |
| 5236 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5237 | static int dev_new_index(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5238 | { |
Pavel Emelyanov | aa79e66 | 2012-08-08 21:53:19 +0000 | [diff] [blame] | 5239 | int ifindex = net->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5240 | for (;;) { |
| 5241 | if (++ifindex <= 0) |
| 5242 | ifindex = 1; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5243 | if (!__dev_get_by_index(net, ifindex)) |
Pavel Emelyanov | aa79e66 | 2012-08-08 21:53:19 +0000 | [diff] [blame] | 5244 | return net->ifindex = ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5245 | } |
| 5246 | } |
| 5247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5248 | /* Delayed registration/unregisteration */ |
Denis Cheng | 3b5b34f | 2007-12-07 00:49:17 -0800 | [diff] [blame] | 5249 | static LIST_HEAD(net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5250 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 5251 | static void net_set_todo(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5252 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5253 | list_add_tail(&dev->todo_list, &net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5254 | } |
| 5255 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5256 | static void rollback_registered_many(struct list_head *head) |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5257 | { |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5258 | struct net_device *dev, *tmp; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5259 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5260 | BUG_ON(dev_boot_phase); |
| 5261 | ASSERT_RTNL(); |
| 5262 | |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5263 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5264 | /* Some devices call without registering |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5265 | * for initialization unwind. Remove those |
| 5266 | * devices and proceed with the remaining. |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5267 | */ |
| 5268 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 5269 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
| 5270 | dev->name, dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5271 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5272 | WARN_ON(1); |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5273 | list_del(&dev->unreg_list); |
| 5274 | continue; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5275 | } |
Eric Dumazet | 449f454 | 2011-05-19 12:24:16 +0000 | [diff] [blame] | 5276 | dev->dismantle = true; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5277 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 5278 | } |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5279 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 5280 | /* If device is running, close it first. */ |
| 5281 | dev_close_many(head); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5282 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 5283 | list_for_each_entry(dev, head, unreg_list) { |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5284 | /* And unlink it from device chain. */ |
| 5285 | unlist_netdevice(dev); |
| 5286 | |
| 5287 | dev->reg_state = NETREG_UNREGISTERING; |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5288 | } |
| 5289 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5290 | synchronize_net(); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5291 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5292 | list_for_each_entry(dev, head, unreg_list) { |
| 5293 | /* Shutdown queueing discipline. */ |
| 5294 | dev_shutdown(dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5295 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5296 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5297 | /* Notify protocols, that we are about to destroy |
| 5298 | this device. They should clean all the things. |
| 5299 | */ |
| 5300 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
| 5301 | |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 5302 | if (!dev->rtnl_link_ops || |
| 5303 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 5304 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); |
| 5305 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5306 | /* |
| 5307 | * Flush the unicast and multicast chains |
| 5308 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 5309 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5310 | dev_mc_flush(dev); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5311 | |
| 5312 | if (dev->netdev_ops->ndo_uninit) |
| 5313 | dev->netdev_ops->ndo_uninit(dev); |
| 5314 | |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 5315 | /* Notifier chain MUST detach us all upper devices. */ |
| 5316 | WARN_ON(netdev_has_any_upper_dev(dev)); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5317 | |
| 5318 | /* Remove entries from kobject tree */ |
| 5319 | netdev_unregister_kobject(dev); |
Alexander Duyck | 024e967 | 2013-01-10 08:57:46 +0000 | [diff] [blame] | 5320 | #ifdef CONFIG_XPS |
| 5321 | /* Remove XPS queueing entries */ |
| 5322 | netif_reset_xps_queues_gt(dev, 0); |
| 5323 | #endif |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5324 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5325 | |
Eric W. Biederman | 850a545 | 2011-10-13 22:25:23 +0000 | [diff] [blame] | 5326 | synchronize_net(); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5327 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5328 | list_for_each_entry(dev, head, unreg_list) |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5329 | dev_put(dev); |
| 5330 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5331 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5332 | static void rollback_registered(struct net_device *dev) |
| 5333 | { |
| 5334 | LIST_HEAD(single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5335 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5336 | list_add(&dev->unreg_list, &single); |
| 5337 | rollback_registered_many(&single); |
Eric Dumazet | ceaaec9 | 2011-02-17 22:59:19 +0000 | [diff] [blame] | 5338 | list_del(&single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5339 | } |
| 5340 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 5341 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
| 5342 | netdev_features_t features) |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5343 | { |
Michał Mirosław | 57422dc | 2011-01-22 12:14:12 +0000 | [diff] [blame] | 5344 | /* Fix illegal checksum combinations */ |
| 5345 | if ((features & NETIF_F_HW_CSUM) && |
| 5346 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5347 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
Michał Mirosław | 57422dc | 2011-01-22 12:14:12 +0000 | [diff] [blame] | 5348 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
| 5349 | } |
| 5350 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5351 | /* TSO requires that SG is present as well. */ |
Ben Hutchings | ea2d368 | 2011-04-12 14:38:37 +0000 | [diff] [blame] | 5352 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5353 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
Ben Hutchings | ea2d368 | 2011-04-12 14:38:37 +0000 | [diff] [blame] | 5354 | features &= ~NETIF_F_ALL_TSO; |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5355 | } |
| 5356 | |
Pravin B Shelar | ec5f061 | 2013-03-07 09:28:01 +0000 | [diff] [blame] | 5357 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
| 5358 | !(features & NETIF_F_IP_CSUM)) { |
| 5359 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); |
| 5360 | features &= ~NETIF_F_TSO; |
| 5361 | features &= ~NETIF_F_TSO_ECN; |
| 5362 | } |
| 5363 | |
| 5364 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && |
| 5365 | !(features & NETIF_F_IPV6_CSUM)) { |
| 5366 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); |
| 5367 | features &= ~NETIF_F_TSO6; |
| 5368 | } |
| 5369 | |
Ben Hutchings | 31d8b9e | 2011-04-12 14:47:15 +0000 | [diff] [blame] | 5370 | /* TSO ECN requires that TSO is present as well. */ |
| 5371 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) |
| 5372 | features &= ~NETIF_F_TSO_ECN; |
| 5373 | |
Michał Mirosław | 212b573 | 2011-02-15 16:59:16 +0000 | [diff] [blame] | 5374 | /* Software GSO depends on SG. */ |
| 5375 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5376 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
Michał Mirosław | 212b573 | 2011-02-15 16:59:16 +0000 | [diff] [blame] | 5377 | features &= ~NETIF_F_GSO; |
| 5378 | } |
| 5379 | |
Michał Mirosław | acd1130 | 2011-01-24 15:45:15 -0800 | [diff] [blame] | 5380 | /* UFO needs SG and checksumming */ |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5381 | if (features & NETIF_F_UFO) { |
Michał Mirosław | 7903264 | 2010-11-30 06:38:00 +0000 | [diff] [blame] | 5382 | /* maybe split UFO into V4 and V6? */ |
| 5383 | if (!((features & NETIF_F_GEN_CSUM) || |
| 5384 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) |
| 5385 | == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5386 | netdev_dbg(dev, |
Michał Mirosław | acd1130 | 2011-01-24 15:45:15 -0800 | [diff] [blame] | 5387 | "Dropping NETIF_F_UFO since no checksum offload features.\n"); |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5388 | features &= ~NETIF_F_UFO; |
| 5389 | } |
| 5390 | |
| 5391 | if (!(features & NETIF_F_SG)) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5392 | netdev_dbg(dev, |
Michał Mirosław | acd1130 | 2011-01-24 15:45:15 -0800 | [diff] [blame] | 5393 | "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n"); |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5394 | features &= ~NETIF_F_UFO; |
| 5395 | } |
| 5396 | } |
| 5397 | |
| 5398 | return features; |
| 5399 | } |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5400 | |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5401 | int __netdev_update_features(struct net_device *dev) |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5402 | { |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 5403 | netdev_features_t features; |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5404 | int err = 0; |
| 5405 | |
Michał Mirosław | 8726748 | 2011-04-12 09:56:38 +0000 | [diff] [blame] | 5406 | ASSERT_RTNL(); |
| 5407 | |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5408 | features = netdev_get_wanted_features(dev); |
| 5409 | |
| 5410 | if (dev->netdev_ops->ndo_fix_features) |
| 5411 | features = dev->netdev_ops->ndo_fix_features(dev, features); |
| 5412 | |
| 5413 | /* driver might be less strict about feature dependencies */ |
| 5414 | features = netdev_fix_features(dev, features); |
| 5415 | |
| 5416 | if (dev->features == features) |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5417 | return 0; |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5418 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 5419 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
| 5420 | &dev->features, &features); |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5421 | |
| 5422 | if (dev->netdev_ops->ndo_set_features) |
| 5423 | err = dev->netdev_ops->ndo_set_features(dev, features); |
| 5424 | |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5425 | if (unlikely(err < 0)) { |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5426 | netdev_err(dev, |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 5427 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
| 5428 | err, &features, &dev->features); |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5429 | return -1; |
| 5430 | } |
| 5431 | |
| 5432 | if (!err) |
| 5433 | dev->features = features; |
| 5434 | |
| 5435 | return 1; |
| 5436 | } |
| 5437 | |
Michał Mirosław | afe12cc | 2011-05-07 03:22:17 +0000 | [diff] [blame] | 5438 | /** |
| 5439 | * netdev_update_features - recalculate device features |
| 5440 | * @dev: the device to check |
| 5441 | * |
| 5442 | * Recalculate dev->features set and send notifications if it |
| 5443 | * has changed. Should be called after driver or hardware dependent |
| 5444 | * conditions might have changed that influence the features. |
| 5445 | */ |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5446 | void netdev_update_features(struct net_device *dev) |
| 5447 | { |
| 5448 | if (__netdev_update_features(dev)) |
| 5449 | netdev_features_change(dev); |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5450 | } |
| 5451 | EXPORT_SYMBOL(netdev_update_features); |
| 5452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5453 | /** |
Michał Mirosław | afe12cc | 2011-05-07 03:22:17 +0000 | [diff] [blame] | 5454 | * netdev_change_features - recalculate device features |
| 5455 | * @dev: the device to check |
| 5456 | * |
| 5457 | * Recalculate dev->features set and send notifications even |
| 5458 | * if they have not changed. Should be called instead of |
| 5459 | * netdev_update_features() if also dev->vlan_features might |
| 5460 | * have changed to allow the changes to be propagated to stacked |
| 5461 | * VLAN devices. |
| 5462 | */ |
| 5463 | void netdev_change_features(struct net_device *dev) |
| 5464 | { |
| 5465 | __netdev_update_features(dev); |
| 5466 | netdev_features_change(dev); |
| 5467 | } |
| 5468 | EXPORT_SYMBOL(netdev_change_features); |
| 5469 | |
| 5470 | /** |
Patrick Mullaney | fc4a748 | 2009-12-03 15:59:22 -0800 | [diff] [blame] | 5471 | * netif_stacked_transfer_operstate - transfer operstate |
| 5472 | * @rootdev: the root or lower level device to transfer state from |
| 5473 | * @dev: the device to transfer operstate to |
| 5474 | * |
| 5475 | * Transfer operational state from root to device. This is normally |
| 5476 | * called when a stacking relationship exists between the root |
| 5477 | * device and the device(a leaf device). |
| 5478 | */ |
| 5479 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, |
| 5480 | struct net_device *dev) |
| 5481 | { |
| 5482 | if (rootdev->operstate == IF_OPER_DORMANT) |
| 5483 | netif_dormant_on(dev); |
| 5484 | else |
| 5485 | netif_dormant_off(dev); |
| 5486 | |
| 5487 | if (netif_carrier_ok(rootdev)) { |
| 5488 | if (!netif_carrier_ok(dev)) |
| 5489 | netif_carrier_on(dev); |
| 5490 | } else { |
| 5491 | if (netif_carrier_ok(dev)) |
| 5492 | netif_carrier_off(dev); |
| 5493 | } |
| 5494 | } |
| 5495 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); |
| 5496 | |
Tom Herbert | bf26414 | 2010-11-26 08:36:09 +0000 | [diff] [blame] | 5497 | #ifdef CONFIG_RPS |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5498 | static int netif_alloc_rx_queues(struct net_device *dev) |
| 5499 | { |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5500 | unsigned int i, count = dev->num_rx_queues; |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5501 | struct netdev_rx_queue *rx; |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5502 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5503 | BUG_ON(count < 1); |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5504 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5505 | rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
Joe Perches | 62b5942 | 2013-02-04 16:48:16 +0000 | [diff] [blame] | 5506 | if (!rx) |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5507 | return -ENOMEM; |
Joe Perches | 62b5942 | 2013-02-04 16:48:16 +0000 | [diff] [blame] | 5508 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5509 | dev->_rx = rx; |
| 5510 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5511 | for (i = 0; i < count; i++) |
Tom Herbert | fe82224 | 2010-11-09 10:47:38 +0000 | [diff] [blame] | 5512 | rx[i].dev = dev; |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5513 | return 0; |
| 5514 | } |
Tom Herbert | bf26414 | 2010-11-26 08:36:09 +0000 | [diff] [blame] | 5515 | #endif |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5516 | |
Changli Gao | aa94210 | 2010-12-04 02:31:41 +0000 | [diff] [blame] | 5517 | static void netdev_init_one_queue(struct net_device *dev, |
| 5518 | struct netdev_queue *queue, void *_unused) |
| 5519 | { |
| 5520 | /* Initialize queue lock */ |
| 5521 | spin_lock_init(&queue->_xmit_lock); |
| 5522 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); |
| 5523 | queue->xmit_lock_owner = -1; |
Changli Gao | b236da6 | 2010-12-14 03:09:15 +0000 | [diff] [blame] | 5524 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
Changli Gao | aa94210 | 2010-12-04 02:31:41 +0000 | [diff] [blame] | 5525 | queue->dev = dev; |
Tom Herbert | 114cf58 | 2011-11-28 16:33:09 +0000 | [diff] [blame] | 5526 | #ifdef CONFIG_BQL |
| 5527 | dql_init(&queue->dql, HZ); |
| 5528 | #endif |
Changli Gao | aa94210 | 2010-12-04 02:31:41 +0000 | [diff] [blame] | 5529 | } |
| 5530 | |
Eric Dumazet | 60877a3 | 2013-06-20 01:15:51 -0700 | [diff] [blame] | 5531 | static void netif_free_tx_queues(struct net_device *dev) |
| 5532 | { |
| 5533 | if (is_vmalloc_addr(dev->_tx)) |
| 5534 | vfree(dev->_tx); |
| 5535 | else |
| 5536 | kfree(dev->_tx); |
| 5537 | } |
| 5538 | |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5539 | static int netif_alloc_netdev_queues(struct net_device *dev) |
| 5540 | { |
| 5541 | unsigned int count = dev->num_tx_queues; |
| 5542 | struct netdev_queue *tx; |
Eric Dumazet | 60877a3 | 2013-06-20 01:15:51 -0700 | [diff] [blame] | 5543 | size_t sz = count * sizeof(*tx); |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5544 | |
Eric Dumazet | 60877a3 | 2013-06-20 01:15:51 -0700 | [diff] [blame] | 5545 | BUG_ON(count < 1 || count > 0xffff); |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5546 | |
Eric Dumazet | 60877a3 | 2013-06-20 01:15:51 -0700 | [diff] [blame] | 5547 | tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
| 5548 | if (!tx) { |
| 5549 | tx = vzalloc(sz); |
| 5550 | if (!tx) |
| 5551 | return -ENOMEM; |
| 5552 | } |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5553 | dev->_tx = tx; |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 5554 | |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5555 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
| 5556 | spin_lock_init(&dev->tx_global_lock); |
Changli Gao | aa94210 | 2010-12-04 02:31:41 +0000 | [diff] [blame] | 5557 | |
| 5558 | return 0; |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5559 | } |
| 5560 | |
Patrick Mullaney | fc4a748 | 2009-12-03 15:59:22 -0800 | [diff] [blame] | 5561 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5562 | * register_netdevice - register a network device |
| 5563 | * @dev: device to register |
| 5564 | * |
| 5565 | * Take a completed network device structure and add it to the kernel |
| 5566 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 5567 | * chain. 0 is returned on success. A negative errno code is returned |
| 5568 | * on a failure to set up the device, or if the name is a duplicate. |
| 5569 | * |
| 5570 | * Callers must hold the rtnl semaphore. You may want |
| 5571 | * register_netdev() instead of this. |
| 5572 | * |
| 5573 | * BUGS: |
| 5574 | * The locking appears insufficient to guarantee two parallel registers |
| 5575 | * will not get the same name. |
| 5576 | */ |
| 5577 | |
| 5578 | int register_netdevice(struct net_device *dev) |
| 5579 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5580 | int ret; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5581 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5582 | |
| 5583 | BUG_ON(dev_boot_phase); |
| 5584 | ASSERT_RTNL(); |
| 5585 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5586 | might_sleep(); |
| 5587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5588 | /* When net_device's are persistent, this will be fatal. */ |
| 5589 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5590 | BUG_ON(!net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5591 | |
David S. Miller | f1f28aa | 2008-07-15 00:08:33 -0700 | [diff] [blame] | 5592 | spin_lock_init(&dev->addr_list_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 5593 | netdev_set_addr_lockdep_class(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5595 | dev->iflink = -1; |
| 5596 | |
Gao feng | 828de4f | 2012-09-13 20:58:27 +0000 | [diff] [blame] | 5597 | ret = dev_get_valid_name(net, dev, dev->name); |
Peter Pan(潘卫平) | 0696c3a | 2011-05-12 15:46:56 +0000 | [diff] [blame] | 5598 | if (ret < 0) |
| 5599 | goto out; |
| 5600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5601 | /* Init, if this function is available */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5602 | if (dev->netdev_ops->ndo_init) { |
| 5603 | ret = dev->netdev_ops->ndo_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5604 | if (ret) { |
| 5605 | if (ret > 0) |
| 5606 | ret = -EIO; |
Adrian Bunk | 90833aa | 2006-11-13 16:02:22 -0800 | [diff] [blame] | 5607 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5608 | } |
| 5609 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5610 | |
Patrick McHardy | f646968 | 2013-04-19 02:04:27 +0000 | [diff] [blame] | 5611 | if (((dev->hw_features | dev->features) & |
| 5612 | NETIF_F_HW_VLAN_CTAG_FILTER) && |
Michał Mirosław | d2ed273 | 2013-01-29 15:14:16 +0000 | [diff] [blame] | 5613 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
| 5614 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { |
| 5615 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); |
| 5616 | ret = -EINVAL; |
| 5617 | goto err_uninit; |
| 5618 | } |
| 5619 | |
Pavel Emelyanov | 9c7dafb | 2012-08-08 21:52:46 +0000 | [diff] [blame] | 5620 | ret = -EBUSY; |
| 5621 | if (!dev->ifindex) |
| 5622 | dev->ifindex = dev_new_index(net); |
| 5623 | else if (__dev_get_by_index(net, dev->ifindex)) |
| 5624 | goto err_uninit; |
| 5625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5626 | if (dev->iflink == -1) |
| 5627 | dev->iflink = dev->ifindex; |
| 5628 | |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5629 | /* Transfer changeable features to wanted_features and enable |
| 5630 | * software offloads (GSO and GRO). |
| 5631 | */ |
| 5632 | dev->hw_features |= NETIF_F_SOFT_FEATURES; |
Michał Mirosław | 14d1232 | 2011-02-22 16:52:28 +0000 | [diff] [blame] | 5633 | dev->features |= NETIF_F_SOFT_FEATURES; |
| 5634 | dev->wanted_features = dev->features & dev->hw_features; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5635 | |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 5636 | /* Turn on no cache copy if HW is doing checksum */ |
Michał Mirosław | 34324dc | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 5637 | if (!(dev->flags & IFF_LOOPBACK)) { |
| 5638 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
| 5639 | if (dev->features & NETIF_F_ALL_CSUM) { |
| 5640 | dev->wanted_features |= NETIF_F_NOCACHE_COPY; |
| 5641 | dev->features |= NETIF_F_NOCACHE_COPY; |
| 5642 | } |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 5643 | } |
| 5644 | |
Michał Mirosław | 1180e7d | 2011-07-14 14:41:11 -0700 | [diff] [blame] | 5645 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
Brandon Philips | 16c3ea7 | 2010-09-15 09:24:24 +0000 | [diff] [blame] | 5646 | */ |
Michał Mirosław | 1180e7d | 2011-07-14 14:41:11 -0700 | [diff] [blame] | 5647 | dev->vlan_features |= NETIF_F_HIGHDMA; |
Brandon Philips | 16c3ea7 | 2010-09-15 09:24:24 +0000 | [diff] [blame] | 5648 | |
Pravin B Shelar | ee57967 | 2013-03-07 09:28:08 +0000 | [diff] [blame] | 5649 | /* Make NETIF_F_SG inheritable to tunnel devices. |
| 5650 | */ |
| 5651 | dev->hw_enc_features |= NETIF_F_SG; |
| 5652 | |
Simon Horman | 0d89d20 | 2013-05-23 21:02:52 +0000 | [diff] [blame] | 5653 | /* Make NETIF_F_SG inheritable to MPLS. |
| 5654 | */ |
| 5655 | dev->mpls_features |= NETIF_F_SG; |
| 5656 | |
Johannes Berg | 7ffbe3f | 2009-10-02 05:15:27 +0000 | [diff] [blame] | 5657 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
| 5658 | ret = notifier_to_errno(ret); |
| 5659 | if (ret) |
| 5660 | goto err_uninit; |
| 5661 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5662 | ret = netdev_register_kobject(dev); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5663 | if (ret) |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5664 | goto err_uninit; |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5665 | dev->reg_state = NETREG_REGISTERED; |
| 5666 | |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5667 | __netdev_update_features(dev); |
Michał Mirosław | 8e9b59b | 2011-02-22 16:52:28 +0000 | [diff] [blame] | 5668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5669 | /* |
| 5670 | * Default initial state at registry is that the |
| 5671 | * device is present. |
| 5672 | */ |
| 5673 | |
| 5674 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5675 | |
Ben Hutchings | 8f4cccb | 2012-08-20 22:16:51 +0100 | [diff] [blame] | 5676 | linkwatch_init_dev(dev); |
| 5677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5678 | dev_init_scheduler(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5679 | dev_hold(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5680 | list_netdevice(dev); |
Theodore Ts'o | 7bf2357 | 2012-07-04 21:23:25 -0400 | [diff] [blame] | 5681 | add_device_randomness(dev->dev_addr, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5682 | |
Jiri Pirko | 948b337 | 2013-01-08 01:38:25 +0000 | [diff] [blame] | 5683 | /* If the device has permanent device address, driver should |
| 5684 | * set dev_addr and also addr_assign_type should be set to |
| 5685 | * NET_ADDR_PERM (default value). |
| 5686 | */ |
| 5687 | if (dev->addr_assign_type == NET_ADDR_PERM) |
| 5688 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); |
| 5689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5690 | /* Notify protocols, that a new device appeared. */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5691 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 5692 | ret = notifier_to_errno(ret); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5693 | if (ret) { |
| 5694 | rollback_registered(dev); |
| 5695 | dev->reg_state = NETREG_UNREGISTERED; |
| 5696 | } |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 5697 | /* |
| 5698 | * Prevent userspace races by waiting until the network |
| 5699 | * device is fully setup before sending notifications. |
| 5700 | */ |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 5701 | if (!dev->rtnl_link_ops || |
| 5702 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 5703 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5704 | |
| 5705 | out: |
| 5706 | return ret; |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5707 | |
| 5708 | err_uninit: |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5709 | if (dev->netdev_ops->ndo_uninit) |
| 5710 | dev->netdev_ops->ndo_uninit(dev); |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5711 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5712 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5713 | EXPORT_SYMBOL(register_netdevice); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5714 | |
| 5715 | /** |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 5716 | * init_dummy_netdev - init a dummy network device for NAPI |
| 5717 | * @dev: device to init |
| 5718 | * |
| 5719 | * This takes a network device structure and initialize the minimum |
| 5720 | * amount of fields so it can be used to schedule NAPI polls without |
| 5721 | * registering a full blown interface. This is to be used by drivers |
| 5722 | * that need to tie several hardware interfaces to a single NAPI |
| 5723 | * poll scheduler due to HW limitations. |
| 5724 | */ |
| 5725 | int init_dummy_netdev(struct net_device *dev) |
| 5726 | { |
| 5727 | /* Clear everything. Note we don't initialize spinlocks |
| 5728 | * are they aren't supposed to be taken by any of the |
| 5729 | * NAPI code and this dummy netdev is supposed to be |
| 5730 | * only ever used for NAPI polls |
| 5731 | */ |
| 5732 | memset(dev, 0, sizeof(struct net_device)); |
| 5733 | |
| 5734 | /* make sure we BUG if trying to hit standard |
| 5735 | * register/unregister code path |
| 5736 | */ |
| 5737 | dev->reg_state = NETREG_DUMMY; |
| 5738 | |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 5739 | /* NAPI wants this */ |
| 5740 | INIT_LIST_HEAD(&dev->napi_list); |
| 5741 | |
| 5742 | /* a dummy interface is started by default */ |
| 5743 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5744 | set_bit(__LINK_STATE_START, &dev->state); |
| 5745 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5746 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
| 5747 | * because users of this 'device' dont need to change |
| 5748 | * its refcount. |
| 5749 | */ |
| 5750 | |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 5751 | return 0; |
| 5752 | } |
| 5753 | EXPORT_SYMBOL_GPL(init_dummy_netdev); |
| 5754 | |
| 5755 | |
| 5756 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5757 | * register_netdev - register a network device |
| 5758 | * @dev: device to register |
| 5759 | * |
| 5760 | * Take a completed network device structure and add it to the kernel |
| 5761 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 5762 | * chain. 0 is returned on success. A negative errno code is returned |
| 5763 | * on a failure to set up the device, or if the name is a duplicate. |
| 5764 | * |
Borislav Petkov | 38b4da3 | 2007-04-20 22:14:10 -0700 | [diff] [blame] | 5765 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5766 | * and expands the device name if you passed a format string to |
| 5767 | * alloc_netdev. |
| 5768 | */ |
| 5769 | int register_netdev(struct net_device *dev) |
| 5770 | { |
| 5771 | int err; |
| 5772 | |
| 5773 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5774 | err = register_netdevice(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5775 | rtnl_unlock(); |
| 5776 | return err; |
| 5777 | } |
| 5778 | EXPORT_SYMBOL(register_netdev); |
| 5779 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5780 | int netdev_refcnt_read(const struct net_device *dev) |
| 5781 | { |
| 5782 | int i, refcnt = 0; |
| 5783 | |
| 5784 | for_each_possible_cpu(i) |
| 5785 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); |
| 5786 | return refcnt; |
| 5787 | } |
| 5788 | EXPORT_SYMBOL(netdev_refcnt_read); |
| 5789 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 5790 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5791 | * netdev_wait_allrefs - wait until all references are gone. |
Randy Dunlap | 3de7a37 | 2012-08-18 14:36:44 +0000 | [diff] [blame] | 5792 | * @dev: target net_device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5793 | * |
| 5794 | * This is called when unregistering network devices. |
| 5795 | * |
| 5796 | * Any protocol or device that holds a reference should register |
| 5797 | * for netdevice notification, and cleanup and put back the |
| 5798 | * reference if they receive an UNREGISTER event. |
| 5799 | * We can get stuck here if buggy protocols don't correctly |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5800 | * call dev_put. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5801 | */ |
| 5802 | static void netdev_wait_allrefs(struct net_device *dev) |
| 5803 | { |
| 5804 | unsigned long rebroadcast_time, warning_time; |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5805 | int refcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5806 | |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 5807 | linkwatch_forget_dev(dev); |
| 5808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5809 | rebroadcast_time = warning_time = jiffies; |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5810 | refcnt = netdev_refcnt_read(dev); |
| 5811 | |
| 5812 | while (refcnt != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5813 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5814 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5815 | |
| 5816 | /* Rebroadcast unregister notification */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5817 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5818 | |
Eric Dumazet | 748e2d9 | 2012-08-22 21:50:59 +0000 | [diff] [blame] | 5819 | __rtnl_unlock(); |
Eric Dumazet | 0115e8e | 2012-08-22 17:19:46 +0000 | [diff] [blame] | 5820 | rcu_barrier(); |
Eric Dumazet | 748e2d9 | 2012-08-22 21:50:59 +0000 | [diff] [blame] | 5821 | rtnl_lock(); |
| 5822 | |
Eric Dumazet | 0115e8e | 2012-08-22 17:19:46 +0000 | [diff] [blame] | 5823 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5824 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
| 5825 | &dev->state)) { |
| 5826 | /* We must not have linkwatch events |
| 5827 | * pending on unregister. If this |
| 5828 | * happens, we simply run the queue |
| 5829 | * unscheduled, resulting in a noop |
| 5830 | * for this device. |
| 5831 | */ |
| 5832 | linkwatch_run_queue(); |
| 5833 | } |
| 5834 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5835 | __rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5836 | |
| 5837 | rebroadcast_time = jiffies; |
| 5838 | } |
| 5839 | |
| 5840 | msleep(250); |
| 5841 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5842 | refcnt = netdev_refcnt_read(dev); |
| 5843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5844 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 5845 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
| 5846 | dev->name, refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5847 | warning_time = jiffies; |
| 5848 | } |
| 5849 | } |
| 5850 | } |
| 5851 | |
| 5852 | /* The sequence is: |
| 5853 | * |
| 5854 | * rtnl_lock(); |
| 5855 | * ... |
| 5856 | * register_netdevice(x1); |
| 5857 | * register_netdevice(x2); |
| 5858 | * ... |
| 5859 | * unregister_netdevice(y1); |
| 5860 | * unregister_netdevice(y2); |
| 5861 | * ... |
| 5862 | * rtnl_unlock(); |
| 5863 | * free_netdev(y1); |
| 5864 | * free_netdev(y2); |
| 5865 | * |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5866 | * We are invoked by rtnl_unlock(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5867 | * This allows us to deal with problems: |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5868 | * 1) We can delete sysfs objects which invoke hotplug |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5869 | * without deadlocking with linkwatch via keventd. |
| 5870 | * 2) Since we run with the RTNL semaphore not held, we can sleep |
| 5871 | * safely in order to wait for the netdev refcnt to drop to zero. |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5872 | * |
| 5873 | * We must not return until all unregister events added during |
| 5874 | * the interval the lock was held have been completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5875 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5876 | void netdev_run_todo(void) |
| 5877 | { |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5878 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5880 | /* Snapshot list, allow later requests */ |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5881 | list_replace_init(&net_todo_list, &list); |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5882 | |
| 5883 | __rtnl_unlock(); |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5884 | |
Eric Dumazet | 0115e8e | 2012-08-22 17:19:46 +0000 | [diff] [blame] | 5885 | |
| 5886 | /* Wait for rcu callbacks to finish before next phase */ |
Eric W. Biederman | 850a545 | 2011-10-13 22:25:23 +0000 | [diff] [blame] | 5887 | if (!list_empty(&list)) |
| 5888 | rcu_barrier(); |
| 5889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5890 | while (!list_empty(&list)) { |
| 5891 | struct net_device *dev |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 5892 | = list_first_entry(&list, struct net_device, todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5893 | list_del(&dev->todo_list); |
| 5894 | |
Eric Dumazet | 748e2d9 | 2012-08-22 21:50:59 +0000 | [diff] [blame] | 5895 | rtnl_lock(); |
Eric Dumazet | 0115e8e | 2012-08-22 17:19:46 +0000 | [diff] [blame] | 5896 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
Eric Dumazet | 748e2d9 | 2012-08-22 21:50:59 +0000 | [diff] [blame] | 5897 | __rtnl_unlock(); |
Eric Dumazet | 0115e8e | 2012-08-22 17:19:46 +0000 | [diff] [blame] | 5898 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5899 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 5900 | pr_err("network todo '%s' but state %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5901 | dev->name, dev->reg_state); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5902 | dump_stack(); |
| 5903 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5904 | } |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5905 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5906 | dev->reg_state = NETREG_UNREGISTERED; |
| 5907 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 5908 | on_each_cpu(flush_backlog, dev, 1); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 5909 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5910 | netdev_wait_allrefs(dev); |
| 5911 | |
| 5912 | /* paranoia */ |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5913 | BUG_ON(netdev_refcnt_read(dev)); |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 5914 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
| 5915 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 5916 | WARN_ON(dev->dn_ptr); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5917 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5918 | if (dev->destructor) |
| 5919 | dev->destructor(dev); |
Stephen Hemminger | 9093bbb | 2007-05-19 15:39:25 -0700 | [diff] [blame] | 5920 | |
| 5921 | /* Free network device */ |
| 5922 | kobject_put(&dev->dev.kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5923 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5924 | } |
| 5925 | |
Ben Hutchings | 3cfde79 | 2010-07-09 09:11:52 +0000 | [diff] [blame] | 5926 | /* Convert net_device_stats to rtnl_link_stats64. They have the same |
| 5927 | * fields in the same order, with only the type differing. |
| 5928 | */ |
Eric Dumazet | 77a1abf | 2012-03-05 04:50:09 +0000 | [diff] [blame] | 5929 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
| 5930 | const struct net_device_stats *netdev_stats) |
Ben Hutchings | 3cfde79 | 2010-07-09 09:11:52 +0000 | [diff] [blame] | 5931 | { |
| 5932 | #if BITS_PER_LONG == 64 |
Eric Dumazet | 77a1abf | 2012-03-05 04:50:09 +0000 | [diff] [blame] | 5933 | BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats)); |
| 5934 | memcpy(stats64, netdev_stats, sizeof(*stats64)); |
Ben Hutchings | 3cfde79 | 2010-07-09 09:11:52 +0000 | [diff] [blame] | 5935 | #else |
| 5936 | size_t i, n = sizeof(*stats64) / sizeof(u64); |
| 5937 | const unsigned long *src = (const unsigned long *)netdev_stats; |
| 5938 | u64 *dst = (u64 *)stats64; |
| 5939 | |
| 5940 | BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) != |
| 5941 | sizeof(*stats64) / sizeof(u64)); |
| 5942 | for (i = 0; i < n; i++) |
| 5943 | dst[i] = src[i]; |
| 5944 | #endif |
| 5945 | } |
Eric Dumazet | 77a1abf | 2012-03-05 04:50:09 +0000 | [diff] [blame] | 5946 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
Ben Hutchings | 3cfde79 | 2010-07-09 09:11:52 +0000 | [diff] [blame] | 5947 | |
Eric Dumazet | d83345a | 2009-11-16 03:36:51 +0000 | [diff] [blame] | 5948 | /** |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5949 | * dev_get_stats - get network device statistics |
| 5950 | * @dev: device to get statistics from |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5951 | * @storage: place to store stats |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5952 | * |
Ben Hutchings | d775351 | 2010-07-09 09:12:41 +0000 | [diff] [blame] | 5953 | * Get network statistics from device. Return @storage. |
| 5954 | * The device driver may provide its own method by setting |
| 5955 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; |
| 5956 | * otherwise the internal statistics structure is used. |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5957 | */ |
Ben Hutchings | d775351 | 2010-07-09 09:12:41 +0000 | [diff] [blame] | 5958 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
| 5959 | struct rtnl_link_stats64 *storage) |
Eric Dumazet | 7004bf2 | 2009-05-18 00:34:33 +0000 | [diff] [blame] | 5960 | { |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5961 | const struct net_device_ops *ops = dev->netdev_ops; |
| 5962 | |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5963 | if (ops->ndo_get_stats64) { |
| 5964 | memset(storage, 0, sizeof(*storage)); |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 5965 | ops->ndo_get_stats64(dev, storage); |
| 5966 | } else if (ops->ndo_get_stats) { |
Ben Hutchings | 3cfde79 | 2010-07-09 09:11:52 +0000 | [diff] [blame] | 5967 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 5968 | } else { |
| 5969 | netdev_stats_to_stats64(storage, &dev->stats); |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5970 | } |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 5971 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5972 | return storage; |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5973 | } |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5974 | EXPORT_SYMBOL(dev_get_stats); |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5975 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5976 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5977 | { |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5978 | struct netdev_queue *queue = dev_ingress_queue(dev); |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5979 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5980 | #ifdef CONFIG_NET_CLS_ACT |
| 5981 | if (queue) |
| 5982 | return queue; |
| 5983 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); |
| 5984 | if (!queue) |
| 5985 | return NULL; |
| 5986 | netdev_init_one_queue(dev, queue, NULL); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5987 | queue->qdisc = &noop_qdisc; |
| 5988 | queue->qdisc_sleeping = &noop_qdisc; |
| 5989 | rcu_assign_pointer(dev->ingress_queue, queue); |
| 5990 | #endif |
| 5991 | return queue; |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5992 | } |
| 5993 | |
Eric Dumazet | 2c60db0 | 2012-09-16 09:17:26 +0000 | [diff] [blame] | 5994 | static const struct ethtool_ops default_ethtool_ops; |
| 5995 | |
Stanislaw Gruszka | d07d750 | 2013-01-10 23:19:10 +0000 | [diff] [blame] | 5996 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
| 5997 | const struct ethtool_ops *ops) |
| 5998 | { |
| 5999 | if (dev->ethtool_ops == &default_ethtool_ops) |
| 6000 | dev->ethtool_ops = ops; |
| 6001 | } |
| 6002 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); |
| 6003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6004 | /** |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6005 | * alloc_netdev_mqs - allocate network device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6006 | * @sizeof_priv: size of private data to allocate space for |
| 6007 | * @name: device name format string |
| 6008 | * @setup: callback to initialize device |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6009 | * @txqs: the number of TX subqueues to allocate |
| 6010 | * @rxqs: the number of RX subqueues to allocate |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6011 | * |
| 6012 | * Allocates a struct net_device with private data area for driver use |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 6013 | * and performs basic initialization. Also allocates subquue structs |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6014 | * for each queue on the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6015 | */ |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6016 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
| 6017 | void (*setup)(struct net_device *), |
| 6018 | unsigned int txqs, unsigned int rxqs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6019 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6020 | struct net_device *dev; |
Stephen Hemminger | 7943986 | 2008-07-21 13:28:44 -0700 | [diff] [blame] | 6021 | size_t alloc_size; |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 6022 | struct net_device *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6023 | |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 6024 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
| 6025 | |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6026 | if (txqs < 1) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 6027 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
Tom Herbert | 55513fb | 2010-10-18 17:55:58 +0000 | [diff] [blame] | 6028 | return NULL; |
| 6029 | } |
| 6030 | |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6031 | #ifdef CONFIG_RPS |
| 6032 | if (rxqs < 1) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 6033 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6034 | return NULL; |
| 6035 | } |
| 6036 | #endif |
| 6037 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 6038 | alloc_size = sizeof(struct net_device); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 6039 | if (sizeof_priv) { |
| 6040 | /* ensure 32-byte alignment of private area */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 6041 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 6042 | alloc_size += sizeof_priv; |
| 6043 | } |
| 6044 | /* ensure 32-byte alignment of whole construct */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 6045 | alloc_size += NETDEV_ALIGN - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6046 | |
Paolo 'Blaisorblade' Giarrusso | 31380de | 2006-04-06 22:38:28 -0700 | [diff] [blame] | 6047 | p = kzalloc(alloc_size, GFP_KERNEL); |
Joe Perches | 62b5942 | 2013-02-04 16:48:16 +0000 | [diff] [blame] | 6048 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6049 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6050 | |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 6051 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6052 | dev->padded = (char *)dev - (char *)p; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6053 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6054 | dev->pcpu_refcnt = alloc_percpu(int); |
| 6055 | if (!dev->pcpu_refcnt) |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 6056 | goto free_p; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6058 | if (dev_addr_init(dev)) |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6059 | goto free_pcpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6060 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 6061 | dev_mc_init(dev); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 6062 | dev_uc_init(dev); |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 6063 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 6064 | dev_net_set(dev, &init_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6065 | |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 6066 | dev->gso_max_size = GSO_MAX_SIZE; |
Ben Hutchings | 30b678d | 2012-07-30 15:57:00 +0000 | [diff] [blame] | 6067 | dev->gso_max_segs = GSO_MAX_SEGS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6068 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 6069 | INIT_LIST_HEAD(&dev->napi_list); |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 6070 | INIT_LIST_HEAD(&dev->unreg_list); |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 6071 | INIT_LIST_HEAD(&dev->link_watch_list); |
Jiri Pirko | 9ff162a | 2013-01-03 22:48:49 +0000 | [diff] [blame] | 6072 | INIT_LIST_HEAD(&dev->upper_dev_list); |
Veaceslav Falico | 5d26191 | 2013-08-28 23:25:05 +0200 | [diff] [blame] | 6073 | INIT_LIST_HEAD(&dev->lower_dev_list); |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 6074 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6075 | setup(dev); |
David S. Miller | 8d3bdbd | 2011-02-08 15:02:50 -0800 | [diff] [blame] | 6076 | |
| 6077 | dev->num_tx_queues = txqs; |
| 6078 | dev->real_num_tx_queues = txqs; |
| 6079 | if (netif_alloc_netdev_queues(dev)) |
| 6080 | goto free_all; |
| 6081 | |
| 6082 | #ifdef CONFIG_RPS |
| 6083 | dev->num_rx_queues = rxqs; |
| 6084 | dev->real_num_rx_queues = rxqs; |
| 6085 | if (netif_alloc_rx_queues(dev)) |
| 6086 | goto free_all; |
| 6087 | #endif |
| 6088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6089 | strcpy(dev->name, name); |
Vlad Dogaru | cbda10f | 2011-01-13 23:38:30 +0000 | [diff] [blame] | 6090 | dev->group = INIT_NETDEV_GROUP; |
Eric Dumazet | 2c60db0 | 2012-09-16 09:17:26 +0000 | [diff] [blame] | 6091 | if (!dev->ethtool_ops) |
| 6092 | dev->ethtool_ops = &default_ethtool_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6093 | return dev; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6094 | |
David S. Miller | 8d3bdbd | 2011-02-08 15:02:50 -0800 | [diff] [blame] | 6095 | free_all: |
| 6096 | free_netdev(dev); |
| 6097 | return NULL; |
| 6098 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6099 | free_pcpu: |
| 6100 | free_percpu(dev->pcpu_refcnt); |
Eric Dumazet | 60877a3 | 2013-06-20 01:15:51 -0700 | [diff] [blame] | 6101 | netif_free_tx_queues(dev); |
Tom Herbert | fe82224 | 2010-11-09 10:47:38 +0000 | [diff] [blame] | 6102 | #ifdef CONFIG_RPS |
| 6103 | kfree(dev->_rx); |
| 6104 | #endif |
| 6105 | |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6106 | free_p: |
| 6107 | kfree(p); |
| 6108 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6109 | } |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6110 | EXPORT_SYMBOL(alloc_netdev_mqs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6111 | |
| 6112 | /** |
| 6113 | * free_netdev - free network device |
| 6114 | * @dev: device |
| 6115 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 6116 | * This function does the last stage of destroying an allocated device |
| 6117 | * interface. The reference to the device object is released. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6118 | * If this is the last reference then it will be freed. |
| 6119 | */ |
| 6120 | void free_netdev(struct net_device *dev) |
| 6121 | { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 6122 | struct napi_struct *p, *n; |
| 6123 | |
Denis V. Lunev | f3005d7 | 2008-04-16 02:02:18 -0700 | [diff] [blame] | 6124 | release_net(dev_net(dev)); |
| 6125 | |
Eric Dumazet | 60877a3 | 2013-06-20 01:15:51 -0700 | [diff] [blame] | 6126 | netif_free_tx_queues(dev); |
Tom Herbert | fe82224 | 2010-11-09 10:47:38 +0000 | [diff] [blame] | 6127 | #ifdef CONFIG_RPS |
| 6128 | kfree(dev->_rx); |
| 6129 | #endif |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 6130 | |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 6131 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 6132 | |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 6133 | /* Flush device addresses */ |
| 6134 | dev_addr_flush(dev); |
| 6135 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 6136 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
| 6137 | netif_napi_del(p); |
| 6138 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6139 | free_percpu(dev->pcpu_refcnt); |
| 6140 | dev->pcpu_refcnt = NULL; |
| 6141 | |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 6142 | /* Compatibility with error handling in drivers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6143 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 6144 | kfree((char *)dev - dev->padded); |
| 6145 | return; |
| 6146 | } |
| 6147 | |
| 6148 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); |
| 6149 | dev->reg_state = NETREG_RELEASED; |
| 6150 | |
Greg Kroah-Hartman | 43cb76d | 2002-04-09 12:14:34 -0700 | [diff] [blame] | 6151 | /* will free via device release */ |
| 6152 | put_device(&dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6153 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 6154 | EXPORT_SYMBOL(free_netdev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 6155 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 6156 | /** |
| 6157 | * synchronize_net - Synchronize with packet receive processing |
| 6158 | * |
| 6159 | * Wait for packets currently being received to be done. |
| 6160 | * Does not block later packets from starting. |
| 6161 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 6162 | void synchronize_net(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6163 | { |
| 6164 | might_sleep(); |
Eric Dumazet | be3fc41 | 2011-05-23 23:07:32 +0000 | [diff] [blame] | 6165 | if (rtnl_is_locked()) |
| 6166 | synchronize_rcu_expedited(); |
| 6167 | else |
| 6168 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6169 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 6170 | EXPORT_SYMBOL(synchronize_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6171 | |
| 6172 | /** |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6173 | * unregister_netdevice_queue - remove device from the kernel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6174 | * @dev: device |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6175 | * @head: list |
Jaswinder Singh Rajput | 6ebfbc0 | 2009-11-22 20:43:13 -0800 | [diff] [blame] | 6176 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6177 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 6178 | * from the kernel tables. |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6179 | * If head not NULL, device is queued to be unregistered later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6180 | * |
| 6181 | * Callers must hold the rtnl semaphore. You may want |
| 6182 | * unregister_netdev() instead of this. |
| 6183 | */ |
| 6184 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6185 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6186 | { |
Herbert Xu | a662071 | 2007-12-12 19:21:56 -0800 | [diff] [blame] | 6187 | ASSERT_RTNL(); |
| 6188 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6189 | if (head) { |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 6190 | list_move_tail(&dev->unreg_list, head); |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6191 | } else { |
| 6192 | rollback_registered(dev); |
| 6193 | /* Finish processing unregister after unlock */ |
| 6194 | net_set_todo(dev); |
| 6195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6196 | } |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6197 | EXPORT_SYMBOL(unregister_netdevice_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6198 | |
| 6199 | /** |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 6200 | * unregister_netdevice_many - unregister many devices |
| 6201 | * @head: list of devices |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 6202 | */ |
| 6203 | void unregister_netdevice_many(struct list_head *head) |
| 6204 | { |
| 6205 | struct net_device *dev; |
| 6206 | |
| 6207 | if (!list_empty(head)) { |
| 6208 | rollback_registered_many(head); |
| 6209 | list_for_each_entry(dev, head, unreg_list) |
| 6210 | net_set_todo(dev); |
| 6211 | } |
| 6212 | } |
Eric Dumazet | 63c8099 | 2009-10-27 07:06:49 +0000 | [diff] [blame] | 6213 | EXPORT_SYMBOL(unregister_netdevice_many); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 6214 | |
| 6215 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6216 | * unregister_netdev - remove device from the kernel |
| 6217 | * @dev: device |
| 6218 | * |
| 6219 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 6220 | * from the kernel tables. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6221 | * |
| 6222 | * This is just a wrapper for unregister_netdevice that takes |
| 6223 | * the rtnl semaphore. In general you want to use this and not |
| 6224 | * unregister_netdevice. |
| 6225 | */ |
| 6226 | void unregister_netdev(struct net_device *dev) |
| 6227 | { |
| 6228 | rtnl_lock(); |
| 6229 | unregister_netdevice(dev); |
| 6230 | rtnl_unlock(); |
| 6231 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6232 | EXPORT_SYMBOL(unregister_netdev); |
| 6233 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6234 | /** |
| 6235 | * dev_change_net_namespace - move device to different nethost namespace |
| 6236 | * @dev: device |
| 6237 | * @net: network namespace |
| 6238 | * @pat: If not NULL name pattern to try if the current device name |
| 6239 | * is already taken in the destination network namespace. |
| 6240 | * |
| 6241 | * This function shuts down a device interface and moves it |
| 6242 | * to a new network namespace. On success 0 is returned, on |
| 6243 | * a failure a netagive errno code is returned. |
| 6244 | * |
| 6245 | * Callers must hold the rtnl semaphore. |
| 6246 | */ |
| 6247 | |
| 6248 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) |
| 6249 | { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6250 | int err; |
| 6251 | |
| 6252 | ASSERT_RTNL(); |
| 6253 | |
| 6254 | /* Don't allow namespace local devices to be moved. */ |
| 6255 | err = -EINVAL; |
| 6256 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 6257 | goto out; |
| 6258 | |
| 6259 | /* Ensure the device has been registrered */ |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6260 | if (dev->reg_state != NETREG_REGISTERED) |
| 6261 | goto out; |
| 6262 | |
| 6263 | /* Get out if there is nothing todo */ |
| 6264 | err = 0; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 6265 | if (net_eq(dev_net(dev), net)) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6266 | goto out; |
| 6267 | |
| 6268 | /* Pick the destination device name, and ensure |
| 6269 | * we can use it in the destination network namespace. |
| 6270 | */ |
| 6271 | err = -EEXIST; |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 6272 | if (__dev_get_by_name(net, dev->name)) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6273 | /* We get here if we can't use the current device name */ |
| 6274 | if (!pat) |
| 6275 | goto out; |
Gao feng | 828de4f | 2012-09-13 20:58:27 +0000 | [diff] [blame] | 6276 | if (dev_get_valid_name(net, dev, pat) < 0) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6277 | goto out; |
| 6278 | } |
| 6279 | |
| 6280 | /* |
| 6281 | * And now a mini version of register_netdevice unregister_netdevice. |
| 6282 | */ |
| 6283 | |
| 6284 | /* If device is running close it first. */ |
Pavel Emelyanov | 9b77265 | 2007-10-10 02:49:09 -0700 | [diff] [blame] | 6285 | dev_close(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6286 | |
| 6287 | /* And unlink it from device chain */ |
| 6288 | err = -ENODEV; |
| 6289 | unlist_netdevice(dev); |
| 6290 | |
| 6291 | synchronize_net(); |
| 6292 | |
| 6293 | /* Shutdown queueing discipline. */ |
| 6294 | dev_shutdown(dev); |
| 6295 | |
| 6296 | /* Notify protocols, that we are about to destroy |
| 6297 | this device. They should clean all the things. |
David Lamparter | 3b27e10 | 2010-09-17 03:22:19 +0000 | [diff] [blame] | 6298 | |
| 6299 | Note that dev->reg_state stays at NETREG_REGISTERED. |
| 6300 | This is wanted because this way 8021q and macvlan know |
| 6301 | the device is just moving and can keep their slaves up. |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6302 | */ |
| 6303 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Gao feng | 6549dd4 | 2012-08-23 15:36:55 +0000 | [diff] [blame] | 6304 | rcu_barrier(); |
| 6305 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
Eric W. Biederman | d2237d3 | 2011-10-21 06:24:20 +0000 | [diff] [blame] | 6306 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6307 | |
| 6308 | /* |
| 6309 | * Flush the unicast and multicast chains |
| 6310 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 6311 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 6312 | dev_mc_flush(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6313 | |
Serge Hallyn | 4e66ae2 | 2012-12-03 16:17:12 +0000 | [diff] [blame] | 6314 | /* Send a netdev-removed uevent to the old namespace */ |
| 6315 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); |
| 6316 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6317 | /* Actually switch the network namespace */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 6318 | dev_net_set(dev, net); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6319 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6320 | /* If there is an ifindex conflict assign a new one */ |
| 6321 | if (__dev_get_by_index(net, dev->ifindex)) { |
| 6322 | int iflink = (dev->iflink == dev->ifindex); |
| 6323 | dev->ifindex = dev_new_index(net); |
| 6324 | if (iflink) |
| 6325 | dev->iflink = dev->ifindex; |
| 6326 | } |
| 6327 | |
Serge Hallyn | 4e66ae2 | 2012-12-03 16:17:12 +0000 | [diff] [blame] | 6328 | /* Send a netdev-add uevent to the new namespace */ |
| 6329 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); |
| 6330 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 6331 | /* Fixup kobjects */ |
Eric W. Biederman | a1b3f59 | 2010-05-04 17:36:49 -0700 | [diff] [blame] | 6332 | err = device_rename(&dev->dev, dev->name); |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 6333 | WARN_ON(err); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6334 | |
| 6335 | /* Add the device back in the hashes */ |
| 6336 | list_netdevice(dev); |
| 6337 | |
| 6338 | /* Notify protocols, that a new device appeared. */ |
| 6339 | call_netdevice_notifiers(NETDEV_REGISTER, dev); |
| 6340 | |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 6341 | /* |
| 6342 | * Prevent userspace races by waiting until the network |
| 6343 | * device is fully setup before sending notifications. |
| 6344 | */ |
| 6345 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
| 6346 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6347 | synchronize_net(); |
| 6348 | err = 0; |
| 6349 | out: |
| 6350 | return err; |
| 6351 | } |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 6352 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6354 | static int dev_cpu_callback(struct notifier_block *nfb, |
| 6355 | unsigned long action, |
| 6356 | void *ocpu) |
| 6357 | { |
| 6358 | struct sk_buff **list_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6359 | struct sk_buff *skb; |
| 6360 | unsigned int cpu, oldcpu = (unsigned long)ocpu; |
| 6361 | struct softnet_data *sd, *oldsd; |
| 6362 | |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 6363 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6364 | return NOTIFY_OK; |
| 6365 | |
| 6366 | local_irq_disable(); |
| 6367 | cpu = smp_processor_id(); |
| 6368 | sd = &per_cpu(softnet_data, cpu); |
| 6369 | oldsd = &per_cpu(softnet_data, oldcpu); |
| 6370 | |
| 6371 | /* Find end of our completion_queue. */ |
| 6372 | list_skb = &sd->completion_queue; |
| 6373 | while (*list_skb) |
| 6374 | list_skb = &(*list_skb)->next; |
| 6375 | /* Append completion queue from offline CPU. */ |
| 6376 | *list_skb = oldsd->completion_queue; |
| 6377 | oldsd->completion_queue = NULL; |
| 6378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6379 | /* Append output queue from offline CPU. */ |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 6380 | if (oldsd->output_queue) { |
| 6381 | *sd->output_queue_tailp = oldsd->output_queue; |
| 6382 | sd->output_queue_tailp = oldsd->output_queue_tailp; |
| 6383 | oldsd->output_queue = NULL; |
| 6384 | oldsd->output_queue_tailp = &oldsd->output_queue; |
| 6385 | } |
Heiko Carstens | 264524d | 2011-06-06 20:50:03 +0000 | [diff] [blame] | 6386 | /* Append NAPI poll list from offline CPU. */ |
| 6387 | if (!list_empty(&oldsd->poll_list)) { |
| 6388 | list_splice_init(&oldsd->poll_list, &sd->poll_list); |
| 6389 | raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 6390 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6391 | |
| 6392 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 6393 | local_irq_enable(); |
| 6394 | |
| 6395 | /* Process offline CPU's input_pkt_queue */ |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 6396 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
| 6397 | netif_rx(skb); |
| 6398 | input_queue_head_incr(oldsd); |
| 6399 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 6400 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6401 | netif_rx(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 6402 | input_queue_head_incr(oldsd); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 6403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6404 | |
| 6405 | return NOTIFY_OK; |
| 6406 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6407 | |
| 6408 | |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6409 | /** |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 6410 | * netdev_increment_features - increment feature set by one |
| 6411 | * @all: current feature set |
| 6412 | * @one: new feature set |
| 6413 | * @mask: mask feature set |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6414 | * |
| 6415 | * Computes a new feature set after adding a device with feature set |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 6416 | * @one to the master device with current feature set @all. Will not |
| 6417 | * enable anything that is off in @mask. Returns the new feature set. |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6418 | */ |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 6419 | netdev_features_t netdev_increment_features(netdev_features_t all, |
| 6420 | netdev_features_t one, netdev_features_t mask) |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6421 | { |
Michał Mirosław | 1742f18 | 2011-04-22 06:31:16 +0000 | [diff] [blame] | 6422 | if (mask & NETIF_F_GEN_CSUM) |
| 6423 | mask |= NETIF_F_ALL_CSUM; |
| 6424 | mask |= NETIF_F_VLAN_CHALLENGED; |
| 6425 | |
| 6426 | all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask; |
| 6427 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
| 6428 | |
Michał Mirosław | 1742f18 | 2011-04-22 06:31:16 +0000 | [diff] [blame] | 6429 | /* If one device supports hw checksumming, set for all. */ |
| 6430 | if (all & NETIF_F_GEN_CSUM) |
| 6431 | all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM); |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6432 | |
| 6433 | return all; |
| 6434 | } |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 6435 | EXPORT_SYMBOL(netdev_increment_features); |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6436 | |
Baruch Siach | 430f03c | 2013-06-02 20:43:55 +0000 | [diff] [blame] | 6437 | static struct hlist_head * __net_init netdev_create_hash(void) |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6438 | { |
| 6439 | int i; |
| 6440 | struct hlist_head *hash; |
| 6441 | |
| 6442 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); |
| 6443 | if (hash != NULL) |
| 6444 | for (i = 0; i < NETDEV_HASHENTRIES; i++) |
| 6445 | INIT_HLIST_HEAD(&hash[i]); |
| 6446 | |
| 6447 | return hash; |
| 6448 | } |
| 6449 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6450 | /* Initialize per network namespace state */ |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 6451 | static int __net_init netdev_init(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6452 | { |
Rustad, Mark D | 734b654 | 2012-07-18 09:06:07 +0000 | [diff] [blame] | 6453 | if (net != &init_net) |
| 6454 | INIT_LIST_HEAD(&net->dev_base_head); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6455 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6456 | net->dev_name_head = netdev_create_hash(); |
| 6457 | if (net->dev_name_head == NULL) |
| 6458 | goto err_name; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6459 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6460 | net->dev_index_head = netdev_create_hash(); |
| 6461 | if (net->dev_index_head == NULL) |
| 6462 | goto err_idx; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6463 | |
| 6464 | return 0; |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6465 | |
| 6466 | err_idx: |
| 6467 | kfree(net->dev_name_head); |
| 6468 | err_name: |
| 6469 | return -ENOMEM; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6470 | } |
| 6471 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 6472 | /** |
| 6473 | * netdev_drivername - network driver for the device |
| 6474 | * @dev: network device |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 6475 | * |
| 6476 | * Determine network driver for device. |
| 6477 | */ |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6478 | const char *netdev_drivername(const struct net_device *dev) |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6479 | { |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 6480 | const struct device_driver *driver; |
| 6481 | const struct device *parent; |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6482 | const char *empty = ""; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6483 | |
| 6484 | parent = dev->dev.parent; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6485 | if (!parent) |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6486 | return empty; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6487 | |
| 6488 | driver = parent->driver; |
| 6489 | if (driver && driver->name) |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6490 | return driver->name; |
| 6491 | return empty; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6492 | } |
| 6493 | |
Joe Perches | b004ff4 | 2012-09-12 20:12:19 -0700 | [diff] [blame] | 6494 | static int __netdev_printk(const char *level, const struct net_device *dev, |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6495 | struct va_format *vaf) |
| 6496 | { |
| 6497 | int r; |
| 6498 | |
Joe Perches | b004ff4 | 2012-09-12 20:12:19 -0700 | [diff] [blame] | 6499 | if (dev && dev->dev.parent) { |
Joe Perches | 666f355 | 2012-09-12 20:14:11 -0700 | [diff] [blame] | 6500 | r = dev_printk_emit(level[1] - '0', |
| 6501 | dev->dev.parent, |
| 6502 | "%s %s %s: %pV", |
| 6503 | dev_driver_string(dev->dev.parent), |
| 6504 | dev_name(dev->dev.parent), |
| 6505 | netdev_name(dev), vaf); |
Joe Perches | b004ff4 | 2012-09-12 20:12:19 -0700 | [diff] [blame] | 6506 | } else if (dev) { |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6507 | r = printk("%s%s: %pV", level, netdev_name(dev), vaf); |
Joe Perches | b004ff4 | 2012-09-12 20:12:19 -0700 | [diff] [blame] | 6508 | } else { |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6509 | r = printk("%s(NULL net_device): %pV", level, vaf); |
Joe Perches | b004ff4 | 2012-09-12 20:12:19 -0700 | [diff] [blame] | 6510 | } |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6511 | |
| 6512 | return r; |
| 6513 | } |
| 6514 | |
| 6515 | int netdev_printk(const char *level, const struct net_device *dev, |
| 6516 | const char *format, ...) |
| 6517 | { |
| 6518 | struct va_format vaf; |
| 6519 | va_list args; |
| 6520 | int r; |
| 6521 | |
| 6522 | va_start(args, format); |
| 6523 | |
| 6524 | vaf.fmt = format; |
| 6525 | vaf.va = &args; |
| 6526 | |
| 6527 | r = __netdev_printk(level, dev, &vaf); |
Joe Perches | b004ff4 | 2012-09-12 20:12:19 -0700 | [diff] [blame] | 6528 | |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6529 | va_end(args); |
| 6530 | |
| 6531 | return r; |
| 6532 | } |
| 6533 | EXPORT_SYMBOL(netdev_printk); |
| 6534 | |
| 6535 | #define define_netdev_printk_level(func, level) \ |
| 6536 | int func(const struct net_device *dev, const char *fmt, ...) \ |
| 6537 | { \ |
| 6538 | int r; \ |
| 6539 | struct va_format vaf; \ |
| 6540 | va_list args; \ |
| 6541 | \ |
| 6542 | va_start(args, fmt); \ |
| 6543 | \ |
| 6544 | vaf.fmt = fmt; \ |
| 6545 | vaf.va = &args; \ |
| 6546 | \ |
| 6547 | r = __netdev_printk(level, dev, &vaf); \ |
Joe Perches | b004ff4 | 2012-09-12 20:12:19 -0700 | [diff] [blame] | 6548 | \ |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6549 | va_end(args); \ |
| 6550 | \ |
| 6551 | return r; \ |
| 6552 | } \ |
| 6553 | EXPORT_SYMBOL(func); |
| 6554 | |
| 6555 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); |
| 6556 | define_netdev_printk_level(netdev_alert, KERN_ALERT); |
| 6557 | define_netdev_printk_level(netdev_crit, KERN_CRIT); |
| 6558 | define_netdev_printk_level(netdev_err, KERN_ERR); |
| 6559 | define_netdev_printk_level(netdev_warn, KERN_WARNING); |
| 6560 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); |
| 6561 | define_netdev_printk_level(netdev_info, KERN_INFO); |
| 6562 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 6563 | static void __net_exit netdev_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6564 | { |
| 6565 | kfree(net->dev_name_head); |
| 6566 | kfree(net->dev_index_head); |
| 6567 | } |
| 6568 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 6569 | static struct pernet_operations __net_initdata netdev_net_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6570 | .init = netdev_init, |
| 6571 | .exit = netdev_exit, |
| 6572 | }; |
| 6573 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 6574 | static void __net_exit default_device_exit(struct net *net) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6575 | { |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6576 | struct net_device *dev, *aux; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6577 | /* |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6578 | * Push all migratable network devices back to the |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6579 | * initial network namespace |
| 6580 | */ |
| 6581 | rtnl_lock(); |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6582 | for_each_netdev_safe(net, dev, aux) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6583 | int err; |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 6584 | char fb_name[IFNAMSIZ]; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6585 | |
| 6586 | /* Ignore unmoveable devices (i.e. loopback) */ |
| 6587 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 6588 | continue; |
| 6589 | |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6590 | /* Leave virtual devices for the generic cleanup */ |
| 6591 | if (dev->rtnl_link_ops) |
| 6592 | continue; |
Eric W. Biederman | d0c082c | 2008-11-05 15:59:38 -0800 | [diff] [blame] | 6593 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 6594 | /* Push remaining network devices to init_net */ |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 6595 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
| 6596 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6597 | if (err) { |
Joe Perches | 7b6cd1c | 2012-02-01 10:54:43 +0000 | [diff] [blame] | 6598 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
| 6599 | __func__, dev->name, err); |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 6600 | BUG(); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6601 | } |
| 6602 | } |
| 6603 | rtnl_unlock(); |
| 6604 | } |
| 6605 | |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6606 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
| 6607 | { |
| 6608 | /* At exit all network devices most be removed from a network |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 6609 | * namespace. Do this in the reverse order of registration. |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6610 | * Do this across as many network namespaces as possible to |
| 6611 | * improve batching efficiency. |
| 6612 | */ |
| 6613 | struct net_device *dev; |
| 6614 | struct net *net; |
| 6615 | LIST_HEAD(dev_kill_list); |
| 6616 | |
| 6617 | rtnl_lock(); |
| 6618 | list_for_each_entry(net, net_list, exit_list) { |
| 6619 | for_each_netdev_reverse(net, dev) { |
| 6620 | if (dev->rtnl_link_ops) |
| 6621 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
| 6622 | else |
| 6623 | unregister_netdevice_queue(dev, &dev_kill_list); |
| 6624 | } |
| 6625 | } |
| 6626 | unregister_netdevice_many(&dev_kill_list); |
Eric Dumazet | ceaaec9 | 2011-02-17 22:59:19 +0000 | [diff] [blame] | 6627 | list_del(&dev_kill_list); |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6628 | rtnl_unlock(); |
| 6629 | } |
| 6630 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 6631 | static struct pernet_operations __net_initdata default_device_ops = { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6632 | .exit = default_device_exit, |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6633 | .exit_batch = default_device_exit_batch, |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6634 | }; |
| 6635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6636 | /* |
| 6637 | * Initialize the DEV module. At boot time this walks the device list and |
| 6638 | * unhooks any devices that fail to initialise (normally hardware not |
| 6639 | * present) and leaves us with a valid list of present and active devices. |
| 6640 | * |
| 6641 | */ |
| 6642 | |
| 6643 | /* |
| 6644 | * This is called single threaded during boot, so no need |
| 6645 | * to take the rtnl semaphore. |
| 6646 | */ |
| 6647 | static int __init net_dev_init(void) |
| 6648 | { |
| 6649 | int i, rc = -ENOMEM; |
| 6650 | |
| 6651 | BUG_ON(!dev_boot_phase); |
| 6652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6653 | if (dev_proc_init()) |
| 6654 | goto out; |
| 6655 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 6656 | if (netdev_kobject_init()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6657 | goto out; |
| 6658 | |
| 6659 | INIT_LIST_HEAD(&ptype_all); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 6660 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6661 | INIT_LIST_HEAD(&ptype_base[i]); |
| 6662 | |
Vlad Yasevich | 62532da | 2012-11-15 08:49:10 +0000 | [diff] [blame] | 6663 | INIT_LIST_HEAD(&offload_base); |
| 6664 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6665 | if (register_pernet_subsys(&netdev_net_ops)) |
| 6666 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6667 | |
| 6668 | /* |
| 6669 | * Initialise the packet receive queues. |
| 6670 | */ |
| 6671 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 6672 | for_each_possible_cpu(i) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6673 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6674 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 6675 | memset(sd, 0, sizeof(*sd)); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6676 | skb_queue_head_init(&sd->input_pkt_queue); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 6677 | skb_queue_head_init(&sd->process_queue); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6678 | sd->completion_queue = NULL; |
| 6679 | INIT_LIST_HEAD(&sd->poll_list); |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 6680 | sd->output_queue = NULL; |
| 6681 | sd->output_queue_tailp = &sd->output_queue; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 6682 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6683 | sd->csd.func = rps_trigger_softirq; |
| 6684 | sd->csd.info = sd; |
| 6685 | sd->csd.flags = 0; |
| 6686 | sd->cpu = i; |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 6687 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 6688 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6689 | sd->backlog.poll = process_backlog; |
| 6690 | sd->backlog.weight = weight_p; |
| 6691 | sd->backlog.gro_list = NULL; |
| 6692 | sd->backlog.gro_count = 0; |
Willem de Bruijn | 99bbc70 | 2013-05-20 04:02:32 +0000 | [diff] [blame] | 6693 | |
| 6694 | #ifdef CONFIG_NET_FLOW_LIMIT |
| 6695 | sd->flow_limit = NULL; |
| 6696 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6697 | } |
| 6698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6699 | dev_boot_phase = 0; |
| 6700 | |
Eric W. Biederman | 505d4f7 | 2008-11-07 22:54:20 -0800 | [diff] [blame] | 6701 | /* The loopback device is special if any other network devices |
| 6702 | * is present in a network namespace the loopback device must |
| 6703 | * be present. Since we now dynamically allocate and free the |
| 6704 | * loopback device ensure this invariant is maintained by |
| 6705 | * keeping the loopback device as the first device on the |
| 6706 | * list of network devices. Ensuring the loopback devices |
| 6707 | * is the first device that appears and the last network device |
| 6708 | * that disappears. |
| 6709 | */ |
| 6710 | if (register_pernet_device(&loopback_net_ops)) |
| 6711 | goto out; |
| 6712 | |
| 6713 | if (register_pernet_device(&default_device_ops)) |
| 6714 | goto out; |
| 6715 | |
Carlos R. Mafra | 962cf36 | 2008-05-15 11:15:37 -0300 | [diff] [blame] | 6716 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
| 6717 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6718 | |
| 6719 | hotcpu_notifier(dev_cpu_callback, 0); |
| 6720 | dst_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6721 | rc = 0; |
| 6722 | out: |
| 6723 | return rc; |
| 6724 | } |
| 6725 | |
| 6726 | subsys_initcall(net_dev_init); |