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> |
| 76 | #include <asm/system.h> |
| 77 | #include <linux/bitops.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 78 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | #include <linux/cpu.h> |
| 80 | #include <linux/types.h> |
| 81 | #include <linux/kernel.h> |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 82 | #include <linux/hash.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 83 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include <linux/sched.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 85 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #include <linux/string.h> |
| 87 | #include <linux/mm.h> |
| 88 | #include <linux/socket.h> |
| 89 | #include <linux/sockios.h> |
| 90 | #include <linux/errno.h> |
| 91 | #include <linux/interrupt.h> |
| 92 | #include <linux/if_ether.h> |
| 93 | #include <linux/netdevice.h> |
| 94 | #include <linux/etherdevice.h> |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 95 | #include <linux/ethtool.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #include <linux/notifier.h> |
| 97 | #include <linux/skbuff.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 98 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #include <net/sock.h> |
| 100 | #include <linux/rtnetlink.h> |
| 101 | #include <linux/proc_fs.h> |
| 102 | #include <linux/seq_file.h> |
| 103 | #include <linux/stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #include <net/dst.h> |
| 105 | #include <net/pkt_sched.h> |
| 106 | #include <net/checksum.h> |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 107 | #include <net/xfrm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #include <linux/highmem.h> |
| 109 | #include <linux/init.h> |
| 110 | #include <linux/kmod.h> |
| 111 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | #include <linux/netpoll.h> |
| 113 | #include <linux/rcupdate.h> |
| 114 | #include <linux/delay.h> |
Johannes Berg | 295f4a1 | 2007-04-26 20:43:56 -0700 | [diff] [blame] | 115 | #include <net/wext.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #include <net/iw_handler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | #include <asm/current.h> |
Steve Grubb | 5bdb988 | 2005-12-03 08:39:35 -0500 | [diff] [blame] | 118 | #include <linux/audit.h> |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 119 | #include <linux/dmaengine.h> |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 120 | #include <linux/err.h> |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 121 | #include <linux/ctype.h> |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 122 | #include <linux/if_arp.h> |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 123 | #include <linux/if_vlan.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 124 | #include <linux/ip.h> |
Alexander Duyck | ad55dca | 2008-09-20 22:05:50 -0700 | [diff] [blame] | 125 | #include <net/ip.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 126 | #include <linux/ipv6.h> |
| 127 | #include <linux/in.h> |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 128 | #include <linux/jhash.h> |
| 129 | #include <linux/random.h> |
David S. Miller | 9cbc1cb | 2009-06-15 03:02:23 -0700 | [diff] [blame] | 130 | #include <trace/events/napi.h> |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 131 | #include <trace/events/net.h> |
Koki Sanagi | 07dc22e | 2010-08-23 18:46:12 +0900 | [diff] [blame] | 132 | #include <trace/events/skb.h> |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 133 | #include <linux/pci.h> |
Stephen Rothwell | caeda9b | 2010-09-16 21:39:16 -0700 | [diff] [blame] | 134 | #include <linux/inetdevice.h> |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 135 | #include <linux/cpu_rmap.h> |
Tom Herbert | e971b722 | 2011-08-14 19:46:12 +0000 | [diff] [blame] | 136 | #include <linux/if_tunnel.h> |
Changli Gao | ae1511b | 2011-08-18 23:23:47 -0700 | [diff] [blame] | 137 | #include <linux/if_pppox.h> |
Changli Gao | 5dd17e0 | 2011-09-20 22:36:07 +0000 | [diff] [blame] | 138 | #include <linux/ppp_defs.h> |
Richard Cochran | 4dc360c | 2011-10-19 17:00:35 -0400 | [diff] [blame] | 139 | #include <linux/net_tstamp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Pavel Emelyanov | 342709e | 2007-10-23 21:14:45 -0700 | [diff] [blame] | 141 | #include "net-sysfs.h" |
| 142 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 143 | /* Instead of increasing this, you should create a hash table. */ |
| 144 | #define MAX_GRO_SKBS 8 |
| 145 | |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 146 | /* This should be increased if a protocol with a bigger head is added. */ |
| 147 | #define GRO_MAX_HEAD (MAX_HEADER + 128) |
| 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | /* |
| 150 | * The list of packet types we will receive (as opposed to discard) |
| 151 | * and the routines to invoke. |
| 152 | * |
| 153 | * Why 16. Because with 16 the only overlap we get on a hash of the |
| 154 | * low nibble of the protocol value is RARP/SNAP/X.25. |
| 155 | * |
| 156 | * NOTE: That is no longer true with the addition of VLAN tags. Not |
| 157 | * sure which should go first, but I bet it won't make much |
| 158 | * difference if we are running VLANs. The good news is that |
| 159 | * this protocol won't be in the list unless compiled in, so |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 160 | * the average user (w/out VLANs) will not be adversely affected. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | * --BLG |
| 162 | * |
| 163 | * 0800 IP |
| 164 | * 8100 802.1Q VLAN |
| 165 | * 0001 802.3 |
| 166 | * 0002 AX.25 |
| 167 | * 0004 802.2 |
| 168 | * 8035 RARP |
| 169 | * 0005 SNAP |
| 170 | * 0805 X.25 |
| 171 | * 0806 ARP |
| 172 | * 8137 IPX |
| 173 | * 0009 Localtalk |
| 174 | * 86DD IPv6 |
| 175 | */ |
| 176 | |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 177 | #define PTYPE_HASH_SIZE (16) |
| 178 | #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | static DEFINE_SPINLOCK(ptype_lock); |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 181 | static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 182 | static struct list_head ptype_all __read_mostly; /* Taps */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | /* |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 185 | * 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] | 186 | * semaphore. |
| 187 | * |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 188 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | * |
| 190 | * Writers must hold the rtnl semaphore while they loop through the |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 191 | * 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] | 192 | * actual updates. This allows pure readers to access the list even |
| 193 | * while a writer is preparing to update it. |
| 194 | * |
| 195 | * To put it another way, dev_base_lock is held for writing only to |
| 196 | * protect against pure readers; the rtnl semaphore provides the |
| 197 | * protection against other writers. |
| 198 | * |
| 199 | * See, for example usages, register_netdevice() and |
| 200 | * unregister_netdevice(), which must be called with the rtnl |
| 201 | * semaphore held. |
| 202 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | DEFINE_RWLOCK(dev_base_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | EXPORT_SYMBOL(dev_base_lock); |
| 205 | |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 206 | static inline void dev_base_seq_inc(struct net *net) |
| 207 | { |
| 208 | while (++net->dev_base_seq == 0); |
| 209 | } |
| 210 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 211 | 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] | 212 | { |
| 213 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 214 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 217 | 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] | 218 | { |
Eric Dumazet | 7c28bd0 | 2009-10-24 06:13:17 -0700 | [diff] [blame] | 219 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 222 | static inline void rps_lock(struct softnet_data *sd) |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 223 | { |
| 224 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 225 | spin_lock(&sd->input_pkt_queue.lock); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 226 | #endif |
| 227 | } |
| 228 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 229 | static inline void rps_unlock(struct softnet_data *sd) |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 230 | { |
| 231 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 232 | spin_unlock(&sd->input_pkt_queue.lock); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 233 | #endif |
| 234 | } |
| 235 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 236 | /* Device list insertion */ |
| 237 | static int list_netdevice(struct net_device *dev) |
| 238 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 239 | struct net *net = dev_net(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 240 | |
| 241 | ASSERT_RTNL(); |
| 242 | |
| 243 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 244 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 245 | 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] | 246 | hlist_add_head_rcu(&dev->index_hlist, |
| 247 | dev_index_hash(net, dev->ifindex)); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 248 | write_unlock_bh(&dev_base_lock); |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 249 | |
| 250 | dev_base_seq_inc(net); |
| 251 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 252 | return 0; |
| 253 | } |
| 254 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 255 | /* Device list removal |
| 256 | * caller must respect a RCU grace period before freeing/reusing dev |
| 257 | */ |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 258 | static void unlist_netdevice(struct net_device *dev) |
| 259 | { |
| 260 | ASSERT_RTNL(); |
| 261 | |
| 262 | /* Unlink dev from the device chain */ |
| 263 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 264 | list_del_rcu(&dev->dev_list); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 265 | hlist_del_rcu(&dev->name_hlist); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 266 | hlist_del_rcu(&dev->index_hlist); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 267 | write_unlock_bh(&dev_base_lock); |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 268 | |
| 269 | dev_base_seq_inc(dev_net(dev)); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 270 | } |
| 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | /* |
| 273 | * Our notifier list |
| 274 | */ |
| 275 | |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 276 | static RAW_NOTIFIER_HEAD(netdev_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
| 278 | /* |
| 279 | * Device drivers call our routines to queue packets here. We empty the |
| 280 | * queue in the local softnet handler. |
| 281 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 282 | |
Eric Dumazet | 9958da0 | 2010-04-17 04:17:02 +0000 | [diff] [blame] | 283 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 284 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 286 | #ifdef CONFIG_LOCKDEP |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 287 | /* |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 288 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 289 | * according to dev->type |
| 290 | */ |
| 291 | static const unsigned short netdev_lock_type[] = |
| 292 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, |
| 293 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
| 294 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, |
| 295 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, |
| 296 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, |
| 297 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, |
| 298 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, |
| 299 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, |
| 300 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, |
| 301 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, |
| 302 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, |
| 303 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, |
| 304 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 305 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, |
Dmitry Eremin-Solenikov | 929122c | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 306 | ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 307 | ARPHRD_VOID, ARPHRD_NONE}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 308 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 309 | static const char *const netdev_lock_name[] = |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 310 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
| 311 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", |
| 312 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", |
| 313 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", |
| 314 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", |
| 315 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", |
| 316 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", |
| 317 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", |
| 318 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", |
| 319 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", |
| 320 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", |
| 321 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", |
| 322 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 323 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", |
Dmitry Eremin-Solenikov | 929122c | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 324 | "_xmit_PHONET_PIPE", "_xmit_IEEE802154", |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 325 | "_xmit_VOID", "_xmit_NONE"}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 326 | |
| 327 | 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] | 328 | 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] | 329 | |
| 330 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) |
| 331 | { |
| 332 | int i; |
| 333 | |
| 334 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) |
| 335 | if (netdev_lock_type[i] == dev_type) |
| 336 | return i; |
| 337 | /* the last key is used by default */ |
| 338 | return ARRAY_SIZE(netdev_lock_type) - 1; |
| 339 | } |
| 340 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 341 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 342 | unsigned short dev_type) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 343 | { |
| 344 | int i; |
| 345 | |
| 346 | i = netdev_lock_pos(dev_type); |
| 347 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], |
| 348 | netdev_lock_name[i]); |
| 349 | } |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 350 | |
| 351 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
| 352 | { |
| 353 | int i; |
| 354 | |
| 355 | i = netdev_lock_pos(dev->type); |
| 356 | lockdep_set_class_and_name(&dev->addr_list_lock, |
| 357 | &netdev_addr_lock_key[i], |
| 358 | netdev_lock_name[i]); |
| 359 | } |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 360 | #else |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 361 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 362 | unsigned short dev_type) |
| 363 | { |
| 364 | } |
| 365 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 366 | { |
| 367 | } |
| 368 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | /******************************************************************************* |
| 371 | |
| 372 | Protocol management and registration routines |
| 373 | |
| 374 | *******************************************************************************/ |
| 375 | |
| 376 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | * Add a protocol ID to the list. Now that the input handler is |
| 378 | * smarter we can dispense with all the messy stuff that used to be |
| 379 | * here. |
| 380 | * |
| 381 | * BEWARE!!! Protocol handlers, mangling input packets, |
| 382 | * MUST BE last in hash buckets and checking protocol handlers |
| 383 | * MUST start from promiscuous ptype_all chain in net_bh. |
| 384 | * It is true now, do not change it. |
| 385 | * Explanation follows: if protocol handler, mangling packet, will |
| 386 | * be the first on list, it is not able to sense, that packet |
| 387 | * is cloned and should be copied-on-write, so that it will |
| 388 | * change it and subsequent readers will get broken packet. |
| 389 | * --ANK (980803) |
| 390 | */ |
| 391 | |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 392 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
| 393 | { |
| 394 | if (pt->type == htons(ETH_P_ALL)) |
| 395 | return &ptype_all; |
| 396 | else |
| 397 | return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
| 398 | } |
| 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | /** |
| 401 | * dev_add_pack - add packet handler |
| 402 | * @pt: packet type declaration |
| 403 | * |
| 404 | * Add a protocol handler to the networking stack. The passed &packet_type |
| 405 | * is linked into kernel lists and may not be freed until it has been |
| 406 | * removed from the kernel lists. |
| 407 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 408 | * This call does not sleep therefore it can not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | * guarantee all CPU's that are in middle of receiving packets |
| 410 | * will see the new packet type (until the next received packet). |
| 411 | */ |
| 412 | |
| 413 | void dev_add_pack(struct packet_type *pt) |
| 414 | { |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 415 | struct list_head *head = ptype_head(pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 417 | spin_lock(&ptype_lock); |
| 418 | list_add_rcu(&pt->list, head); |
| 419 | spin_unlock(&ptype_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 421 | EXPORT_SYMBOL(dev_add_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | /** |
| 424 | * __dev_remove_pack - remove packet handler |
| 425 | * @pt: packet type declaration |
| 426 | * |
| 427 | * Remove a protocol handler that was previously added to the kernel |
| 428 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 429 | * 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] | 430 | * returns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | * |
| 432 | * The packet type might still be in use by receivers |
| 433 | * and must not be freed until after all the CPU's have gone |
| 434 | * through a quiescent state. |
| 435 | */ |
| 436 | void __dev_remove_pack(struct packet_type *pt) |
| 437 | { |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 438 | struct list_head *head = ptype_head(pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | struct packet_type *pt1; |
| 440 | |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 441 | spin_lock(&ptype_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
| 443 | list_for_each_entry(pt1, head, list) { |
| 444 | if (pt == pt1) { |
| 445 | list_del_rcu(&pt->list); |
| 446 | goto out; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); |
| 451 | out: |
Eric Dumazet | c07b68e | 2010-09-02 03:53:46 +0000 | [diff] [blame] | 452 | spin_unlock(&ptype_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 454 | EXPORT_SYMBOL(__dev_remove_pack); |
| 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | /** |
| 457 | * dev_remove_pack - remove packet handler |
| 458 | * @pt: packet type declaration |
| 459 | * |
| 460 | * Remove a protocol handler that was previously added to the kernel |
| 461 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 462 | * from the kernel lists and can be freed or reused once this function |
| 463 | * returns. |
| 464 | * |
| 465 | * This call sleeps to guarantee that no CPU is looking at the packet |
| 466 | * type after return. |
| 467 | */ |
| 468 | void dev_remove_pack(struct packet_type *pt) |
| 469 | { |
| 470 | __dev_remove_pack(pt); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | synchronize_net(); |
| 473 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 474 | EXPORT_SYMBOL(dev_remove_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | /****************************************************************************** |
| 477 | |
| 478 | Device Boot-time Settings Routines |
| 479 | |
| 480 | *******************************************************************************/ |
| 481 | |
| 482 | /* Boot time configuration table */ |
| 483 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; |
| 484 | |
| 485 | /** |
| 486 | * netdev_boot_setup_add - add new setup entry |
| 487 | * @name: name of the device |
| 488 | * @map: configured settings for the device |
| 489 | * |
| 490 | * Adds new setup entry to the dev_boot_setup list. The function |
| 491 | * returns 0 on error and 1 on success. This is a generic routine to |
| 492 | * all netdevices. |
| 493 | */ |
| 494 | static int netdev_boot_setup_add(char *name, struct ifmap *map) |
| 495 | { |
| 496 | struct netdev_boot_setup *s; |
| 497 | int i; |
| 498 | |
| 499 | s = dev_boot_setup; |
| 500 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 501 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { |
| 502 | memset(s[i].name, 0, sizeof(s[i].name)); |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 503 | strlcpy(s[i].name, name, IFNAMSIZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
| 505 | break; |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; |
| 510 | } |
| 511 | |
| 512 | /** |
| 513 | * netdev_boot_setup_check - check boot time settings |
| 514 | * @dev: the netdevice |
| 515 | * |
| 516 | * Check boot time settings for the device. |
| 517 | * The found settings are set for the device to be used |
| 518 | * later in the device probing. |
| 519 | * Returns 0 if no settings found, 1 if they are. |
| 520 | */ |
| 521 | int netdev_boot_setup_check(struct net_device *dev) |
| 522 | { |
| 523 | struct netdev_boot_setup *s = dev_boot_setup; |
| 524 | int i; |
| 525 | |
| 526 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 527 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 528 | !strcmp(dev->name, s[i].name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | dev->irq = s[i].map.irq; |
| 530 | dev->base_addr = s[i].map.base_addr; |
| 531 | dev->mem_start = s[i].map.mem_start; |
| 532 | dev->mem_end = s[i].map.mem_end; |
| 533 | return 1; |
| 534 | } |
| 535 | } |
| 536 | return 0; |
| 537 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 538 | EXPORT_SYMBOL(netdev_boot_setup_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
| 540 | |
| 541 | /** |
| 542 | * netdev_boot_base - get address from boot time settings |
| 543 | * @prefix: prefix for network device |
| 544 | * @unit: id for network device |
| 545 | * |
| 546 | * Check boot time settings for the base address of device. |
| 547 | * The found settings are set for the device to be used |
| 548 | * later in the device probing. |
| 549 | * Returns 0 if no settings found. |
| 550 | */ |
| 551 | unsigned long netdev_boot_base(const char *prefix, int unit) |
| 552 | { |
| 553 | const struct netdev_boot_setup *s = dev_boot_setup; |
| 554 | char name[IFNAMSIZ]; |
| 555 | int i; |
| 556 | |
| 557 | sprintf(name, "%s%d", prefix, unit); |
| 558 | |
| 559 | /* |
| 560 | * If device already registered then return base of 1 |
| 561 | * to indicate not to probe for this interface |
| 562 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 563 | if (__dev_get_by_name(&init_net, name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | return 1; |
| 565 | |
| 566 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) |
| 567 | if (!strcmp(name, s[i].name)) |
| 568 | return s[i].map.base_addr; |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Saves at boot time configured settings for any netdevice. |
| 574 | */ |
| 575 | int __init netdev_boot_setup(char *str) |
| 576 | { |
| 577 | int ints[5]; |
| 578 | struct ifmap map; |
| 579 | |
| 580 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 581 | if (!str || !*str) |
| 582 | return 0; |
| 583 | |
| 584 | /* Save settings */ |
| 585 | memset(&map, 0, sizeof(map)); |
| 586 | if (ints[0] > 0) |
| 587 | map.irq = ints[1]; |
| 588 | if (ints[0] > 1) |
| 589 | map.base_addr = ints[2]; |
| 590 | if (ints[0] > 2) |
| 591 | map.mem_start = ints[3]; |
| 592 | if (ints[0] > 3) |
| 593 | map.mem_end = ints[4]; |
| 594 | |
| 595 | /* Add new entry to the list */ |
| 596 | return netdev_boot_setup_add(str, &map); |
| 597 | } |
| 598 | |
| 599 | __setup("netdev=", netdev_boot_setup); |
| 600 | |
| 601 | /******************************************************************************* |
| 602 | |
| 603 | Device Interface Subroutines |
| 604 | |
| 605 | *******************************************************************************/ |
| 606 | |
| 607 | /** |
| 608 | * __dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 609 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | * @name: name to find |
| 611 | * |
| 612 | * Find an interface by name. Must be called under RTNL semaphore |
| 613 | * or @dev_base_lock. If the name is found a pointer to the device |
| 614 | * is returned. If the name is not found then %NULL is returned. The |
| 615 | * reference counters are not incremented so the caller must be |
| 616 | * careful with locks. |
| 617 | */ |
| 618 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 619 | 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] | 620 | { |
| 621 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 622 | struct net_device *dev; |
| 623 | struct hlist_head *head = dev_name_hash(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 625 | hlist_for_each_entry(dev, p, head, name_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 627 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | return NULL; |
| 630 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 631 | EXPORT_SYMBOL(__dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | /** |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 634 | * dev_get_by_name_rcu - find a device by its name |
| 635 | * @net: the applicable net namespace |
| 636 | * @name: name to find |
| 637 | * |
| 638 | * Find an interface by name. |
| 639 | * If the name is found a pointer to the device is returned. |
| 640 | * If the name is not found then %NULL is returned. |
| 641 | * The reference counters are not incremented so the caller must be |
| 642 | * careful with locks. The caller must hold RCU lock. |
| 643 | */ |
| 644 | |
| 645 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) |
| 646 | { |
| 647 | struct hlist_node *p; |
| 648 | struct net_device *dev; |
| 649 | struct hlist_head *head = dev_name_hash(net, name); |
| 650 | |
| 651 | hlist_for_each_entry_rcu(dev, p, head, name_hlist) |
| 652 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 653 | return dev; |
| 654 | |
| 655 | return NULL; |
| 656 | } |
| 657 | EXPORT_SYMBOL(dev_get_by_name_rcu); |
| 658 | |
| 659 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | * dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 661 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | * @name: name to find |
| 663 | * |
| 664 | * Find an interface by name. This can be called from any |
| 665 | * context and does its own locking. The returned handle has |
| 666 | * the usage count incremented and the caller must use dev_put() to |
| 667 | * release it when it is no longer needed. %NULL is returned if no |
| 668 | * matching device is found. |
| 669 | */ |
| 670 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 671 | 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] | 672 | { |
| 673 | struct net_device *dev; |
| 674 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 675 | rcu_read_lock(); |
| 676 | dev = dev_get_by_name_rcu(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | if (dev) |
| 678 | dev_hold(dev); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 679 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | return dev; |
| 681 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 682 | EXPORT_SYMBOL(dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
| 684 | /** |
| 685 | * __dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 686 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | * @ifindex: index of device |
| 688 | * |
| 689 | * Search for an interface by index. Returns %NULL if the device |
| 690 | * is not found or a pointer to the device. The device has not |
| 691 | * had its reference counter increased so the caller must be careful |
| 692 | * about locking. The caller must hold either the RTNL semaphore |
| 693 | * or @dev_base_lock. |
| 694 | */ |
| 695 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 696 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | { |
| 698 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 699 | struct net_device *dev; |
| 700 | struct hlist_head *head = dev_index_hash(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 702 | hlist_for_each_entry(dev, p, head, index_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | if (dev->ifindex == ifindex) |
| 704 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | return NULL; |
| 707 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 708 | EXPORT_SYMBOL(__dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 710 | /** |
| 711 | * dev_get_by_index_rcu - find a device by its ifindex |
| 712 | * @net: the applicable net namespace |
| 713 | * @ifindex: index of device |
| 714 | * |
| 715 | * Search for an interface by index. Returns %NULL if the device |
| 716 | * is not found or a pointer to the device. The device has not |
| 717 | * had its reference counter increased so the caller must be careful |
| 718 | * about locking. The caller must hold RCU lock. |
| 719 | */ |
| 720 | |
| 721 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) |
| 722 | { |
| 723 | struct hlist_node *p; |
| 724 | struct net_device *dev; |
| 725 | struct hlist_head *head = dev_index_hash(net, ifindex); |
| 726 | |
| 727 | hlist_for_each_entry_rcu(dev, p, head, index_hlist) |
| 728 | if (dev->ifindex == ifindex) |
| 729 | return dev; |
| 730 | |
| 731 | return NULL; |
| 732 | } |
| 733 | EXPORT_SYMBOL(dev_get_by_index_rcu); |
| 734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
| 736 | /** |
| 737 | * dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 738 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | * @ifindex: index of device |
| 740 | * |
| 741 | * Search for an interface by index. Returns NULL if the device |
| 742 | * is not found or a pointer to the device. The device returned has |
| 743 | * had a reference added and the pointer is safe until the user calls |
| 744 | * dev_put to indicate they have finished with it. |
| 745 | */ |
| 746 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 747 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | { |
| 749 | struct net_device *dev; |
| 750 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 751 | rcu_read_lock(); |
| 752 | dev = dev_get_by_index_rcu(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | if (dev) |
| 754 | dev_hold(dev); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 755 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | return dev; |
| 757 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 758 | EXPORT_SYMBOL(dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
| 760 | /** |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 761 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 762 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | * @type: media type of device |
| 764 | * @ha: hardware address |
| 765 | * |
| 766 | * Search for an interface by MAC address. Returns NULL if the device |
Eric Dumazet | c506653 | 2011-01-24 13:16:16 -0800 | [diff] [blame] | 767 | * is not found or a pointer to the device. |
| 768 | * The caller must hold RCU or RTNL. |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 769 | * The returned device has not had its ref count increased |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | * and the caller must therefore be careful about locking |
| 771 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | */ |
| 773 | |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 774 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
| 775 | const char *ha) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | { |
| 777 | struct net_device *dev; |
| 778 | |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 779 | for_each_netdev_rcu(net, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | if (dev->type == type && |
| 781 | !memcmp(dev->dev_addr, ha, dev->addr_len)) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 782 | return dev; |
| 783 | |
| 784 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 786 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
Jochen Friedrich | cf309e3 | 2005-09-22 04:44:55 -0300 | [diff] [blame] | 787 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 788 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 789 | { |
| 790 | struct net_device *dev; |
| 791 | |
| 792 | ASSERT_RTNL(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 793 | for_each_netdev(net, dev) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 794 | if (dev->type == type) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 795 | return dev; |
| 796 | |
| 797 | return NULL; |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 798 | } |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 799 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
| 800 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 801 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 803 | struct net_device *dev, *ret = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 805 | rcu_read_lock(); |
| 806 | for_each_netdev_rcu(net, dev) |
| 807 | if (dev->type == type) { |
| 808 | dev_hold(dev); |
| 809 | ret = dev; |
| 810 | break; |
| 811 | } |
| 812 | rcu_read_unlock(); |
| 813 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
| 816 | |
| 817 | /** |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 818 | * dev_get_by_flags_rcu - find any device with given flags |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 819 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | * @if_flags: IFF_* values |
| 821 | * @mask: bitmask of bits in if_flags to check |
| 822 | * |
| 823 | * 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] | 824 | * is not found or a pointer to the device. Must be called inside |
| 825 | * rcu_read_lock(), and result refcount is unchanged. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | */ |
| 827 | |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 828 | 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] | 829 | unsigned short mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 831 | struct net_device *dev, *ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 833 | ret = NULL; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 834 | for_each_netdev_rcu(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | if (((dev->flags ^ if_flags) & mask) == 0) { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 836 | ret = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | break; |
| 838 | } |
| 839 | } |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 840 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | } |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 842 | EXPORT_SYMBOL(dev_get_by_flags_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
| 844 | /** |
| 845 | * dev_valid_name - check if name is okay for network device |
| 846 | * @name: name string |
| 847 | * |
| 848 | * Network device names need to be valid file names to |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 849 | * to allow sysfs to work. We also disallow any kind of |
| 850 | * whitespace. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | */ |
Mitch Williams | c2373ee | 2005-11-09 10:34:45 -0800 | [diff] [blame] | 852 | int dev_valid_name(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | { |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 854 | if (*name == '\0') |
| 855 | return 0; |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 856 | if (strlen(name) >= IFNAMSIZ) |
| 857 | return 0; |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 858 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
| 859 | return 0; |
| 860 | |
| 861 | while (*name) { |
| 862 | if (*name == '/' || isspace(*name)) |
| 863 | return 0; |
| 864 | name++; |
| 865 | } |
| 866 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 868 | EXPORT_SYMBOL(dev_valid_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | /** |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 871 | * __dev_alloc_name - allocate a name for a device |
| 872 | * @net: network namespace to allocate the device name in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | * @name: name format string |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 874 | * @buf: scratch buffer and result name string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | * |
| 876 | * 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] | 877 | * id. It scans list of devices to build up a free map, then chooses |
| 878 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 879 | * while allocating the name and adding the device in order to avoid |
| 880 | * duplicates. |
| 881 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 882 | * Returns the number of the unit assigned or a negative errno code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | */ |
| 884 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 885 | 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] | 886 | { |
| 887 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | const char *p; |
| 889 | const int max_netdevices = 8*PAGE_SIZE; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 890 | unsigned long *inuse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | struct net_device *d; |
| 892 | |
| 893 | p = strnchr(name, IFNAMSIZ-1, '%'); |
| 894 | if (p) { |
| 895 | /* |
| 896 | * Verify the string as this thing may have come from |
| 897 | * the user. There must be either one "%d" and no other "%" |
| 898 | * characters. |
| 899 | */ |
| 900 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 901 | return -EINVAL; |
| 902 | |
| 903 | /* Use one page as a bit array of possible slots */ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 904 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | if (!inuse) |
| 906 | return -ENOMEM; |
| 907 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 908 | for_each_netdev(net, d) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | if (!sscanf(d->name, name, &i)) |
| 910 | continue; |
| 911 | if (i < 0 || i >= max_netdevices) |
| 912 | continue; |
| 913 | |
| 914 | /* avoid cases where sscanf is not exact inverse of printf */ |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 915 | snprintf(buf, IFNAMSIZ, name, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
| 917 | set_bit(i, inuse); |
| 918 | } |
| 919 | |
| 920 | i = find_first_zero_bit(inuse, max_netdevices); |
| 921 | free_page((unsigned long) inuse); |
| 922 | } |
| 923 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 924 | if (buf != name) |
| 925 | snprintf(buf, IFNAMSIZ, name, i); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 926 | if (!__dev_get_by_name(net, buf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | |
| 929 | /* It is possible to run out of possible slots |
| 930 | * when the name is long and there isn't enough space left |
| 931 | * for the digits, or if all bits are used. |
| 932 | */ |
| 933 | return -ENFILE; |
| 934 | } |
| 935 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 936 | /** |
| 937 | * dev_alloc_name - allocate a name for a device |
| 938 | * @dev: device |
| 939 | * @name: name format string |
| 940 | * |
| 941 | * Passed a format string - eg "lt%d" it will try and find a suitable |
| 942 | * id. It scans list of devices to build up a free map, then chooses |
| 943 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 944 | * while allocating the name and adding the device in order to avoid |
| 945 | * duplicates. |
| 946 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 947 | * Returns the number of the unit assigned or a negative errno code. |
| 948 | */ |
| 949 | |
| 950 | int dev_alloc_name(struct net_device *dev, const char *name) |
| 951 | { |
| 952 | char buf[IFNAMSIZ]; |
| 953 | struct net *net; |
| 954 | int ret; |
| 955 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 956 | BUG_ON(!dev_net(dev)); |
| 957 | net = dev_net(dev); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 958 | ret = __dev_alloc_name(net, name, buf); |
| 959 | if (ret >= 0) |
| 960 | strlcpy(dev->name, buf, IFNAMSIZ); |
| 961 | return ret; |
| 962 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 963 | EXPORT_SYMBOL(dev_alloc_name); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 964 | |
Jiri Pirko | 1c5cae8 | 2011-04-30 01:21:32 +0000 | [diff] [blame] | 965 | static int dev_get_valid_name(struct net_device *dev, const char *name) |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 966 | { |
Daniel Lezcano | 8ce6ceb | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 967 | struct net *net; |
| 968 | |
| 969 | BUG_ON(!dev_net(dev)); |
| 970 | net = dev_net(dev); |
| 971 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 972 | if (!dev_valid_name(name)) |
| 973 | return -EINVAL; |
| 974 | |
Jiri Pirko | 1c5cae8 | 2011-04-30 01:21:32 +0000 | [diff] [blame] | 975 | if (strchr(name, '%')) |
Daniel Lezcano | 8ce6ceb | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 976 | return dev_alloc_name(dev, name); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 977 | else if (__dev_get_by_name(net, name)) |
| 978 | return -EEXIST; |
Daniel Lezcano | 8ce6ceb | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 979 | else if (dev->name != name) |
| 980 | strlcpy(dev->name, name, IFNAMSIZ); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 981 | |
| 982 | return 0; |
| 983 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
| 985 | /** |
| 986 | * dev_change_name - change name of a device |
| 987 | * @dev: device |
| 988 | * @newname: name (or format string) must be at least IFNAMSIZ |
| 989 | * |
| 990 | * Change name of a device, can pass format strings "eth%d". |
| 991 | * for wildcarding. |
| 992 | */ |
Stephen Hemminger | cf04a4c | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 993 | int dev_change_name(struct net_device *dev, const char *newname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 995 | char oldname[IFNAMSIZ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | int err = 0; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 997 | int ret; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 998 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
| 1000 | ASSERT_RTNL(); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1001 | BUG_ON(!dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1003 | net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | if (dev->flags & IFF_UP) |
| 1005 | return -EBUSY; |
| 1006 | |
Stephen Hemminger | c8d90dc | 2007-10-26 03:53:42 -0700 | [diff] [blame] | 1007 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) |
| 1008 | return 0; |
| 1009 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1010 | memcpy(oldname, dev->name, IFNAMSIZ); |
| 1011 | |
Jiri Pirko | 1c5cae8 | 2011-04-30 01:21:32 +0000 | [diff] [blame] | 1012 | err = dev_get_valid_name(dev, newname); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1013 | if (err < 0) |
| 1014 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1016 | rollback: |
Eric W. Biederman | a1b3f59 | 2010-05-04 17:36:49 -0700 | [diff] [blame] | 1017 | ret = device_rename(&dev->dev, dev->name); |
| 1018 | if (ret) { |
| 1019 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1020 | return ret; |
Stephen Hemminger | dcc9977 | 2008-05-14 22:33:38 -0700 | [diff] [blame] | 1021 | } |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 1022 | |
| 1023 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | 372b231 | 2011-05-17 13:56:59 -0400 | [diff] [blame] | 1024 | hlist_del_rcu(&dev->name_hlist); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1025 | write_unlock_bh(&dev_base_lock); |
| 1026 | |
| 1027 | synchronize_rcu(); |
| 1028 | |
| 1029 | write_lock_bh(&dev_base_lock); |
| 1030 | 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] | 1031 | write_unlock_bh(&dev_base_lock); |
| 1032 | |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1033 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1034 | ret = notifier_to_errno(ret); |
| 1035 | |
| 1036 | if (ret) { |
Eric Dumazet | 91e9c07 | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1037 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
| 1038 | if (err >= 0) { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1039 | err = ret; |
| 1040 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1041 | goto rollback; |
Eric Dumazet | 91e9c07 | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1042 | } else { |
| 1043 | printk(KERN_ERR |
| 1044 | "%s: name change rollback failed: %d.\n", |
| 1045 | dev->name, ret); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1046 | } |
| 1047 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | |
| 1049 | return err; |
| 1050 | } |
| 1051 | |
| 1052 | /** |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1053 | * dev_set_alias - change ifalias of a device |
| 1054 | * @dev: device |
| 1055 | * @alias: name up to IFALIASZ |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 1056 | * @len: limit of bytes to copy from info |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1057 | * |
| 1058 | * Set ifalias for a device, |
| 1059 | */ |
| 1060 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) |
| 1061 | { |
| 1062 | ASSERT_RTNL(); |
| 1063 | |
| 1064 | if (len >= IFALIASZ) |
| 1065 | return -EINVAL; |
| 1066 | |
Oliver Hartkopp | 96ca4a2 | 2008-09-23 21:23:19 -0700 | [diff] [blame] | 1067 | if (!len) { |
| 1068 | if (dev->ifalias) { |
| 1069 | kfree(dev->ifalias); |
| 1070 | dev->ifalias = NULL; |
| 1071 | } |
| 1072 | return 0; |
| 1073 | } |
| 1074 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1075 | dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1076 | if (!dev->ifalias) |
| 1077 | return -ENOMEM; |
| 1078 | |
| 1079 | strlcpy(dev->ifalias, alias, len+1); |
| 1080 | return len; |
| 1081 | } |
| 1082 | |
| 1083 | |
| 1084 | /** |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 1085 | * netdev_features_change - device changes features |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1086 | * @dev: device to cause notification |
| 1087 | * |
| 1088 | * Called to indicate a device has changed features. |
| 1089 | */ |
| 1090 | void netdev_features_change(struct net_device *dev) |
| 1091 | { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1092 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1093 | } |
| 1094 | EXPORT_SYMBOL(netdev_features_change); |
| 1095 | |
| 1096 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | * netdev_state_change - device changes state |
| 1098 | * @dev: device to cause notification |
| 1099 | * |
| 1100 | * Called to indicate a device has changed state. This function calls |
| 1101 | * the notifier chains for netdev_chain and sends a NEWLINK message |
| 1102 | * to the routing socket. |
| 1103 | */ |
| 1104 | void netdev_state_change(struct net_device *dev) |
| 1105 | { |
| 1106 | if (dev->flags & IFF_UP) { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1107 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
| 1109 | } |
| 1110 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1111 | EXPORT_SYMBOL(netdev_state_change); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Jiri Pirko | 3ca5b40 | 2010-03-10 10:29:35 +0000 | [diff] [blame] | 1113 | int netdev_bonding_change(struct net_device *dev, unsigned long event) |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1114 | { |
Jiri Pirko | 3ca5b40 | 2010-03-10 10:29:35 +0000 | [diff] [blame] | 1115 | return call_netdevice_notifiers(event, dev); |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1116 | } |
| 1117 | EXPORT_SYMBOL(netdev_bonding_change); |
| 1118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | /** |
| 1120 | * dev_load - load a network module |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1121 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | * @name: name of interface |
| 1123 | * |
| 1124 | * If a network interface is not present and the process has suitable |
| 1125 | * privileges this function loads the module. If module loading is not |
| 1126 | * available in this kernel then it becomes a nop. |
| 1127 | */ |
| 1128 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1129 | void dev_load(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1131 | struct net_device *dev; |
Vasiliy Kulikov | 8909c9a | 2011-03-02 00:33:13 +0300 | [diff] [blame] | 1132 | int no_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1134 | rcu_read_lock(); |
| 1135 | dev = dev_get_by_name_rcu(net, name); |
| 1136 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | |
Vasiliy Kulikov | 8909c9a | 2011-03-02 00:33:13 +0300 | [diff] [blame] | 1138 | no_module = !dev; |
| 1139 | if (no_module && capable(CAP_NET_ADMIN)) |
| 1140 | no_module = request_module("netdev-%s", name); |
| 1141 | if (no_module && capable(CAP_SYS_MODULE)) { |
| 1142 | if (!request_module("%s", name)) |
| 1143 | pr_err("Loading kernel module for a network device " |
| 1144 | "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s " |
| 1145 | "instead\n", name); |
| 1146 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1148 | EXPORT_SYMBOL(dev_load); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1150 | static int __dev_open(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1152 | const struct net_device_ops *ops = dev->netdev_ops; |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1153 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1155 | ASSERT_RTNL(); |
| 1156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | if (!netif_device_present(dev)) |
| 1158 | return -ENODEV; |
| 1159 | |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1160 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
| 1161 | ret = notifier_to_errno(ret); |
| 1162 | if (ret) |
| 1163 | return ret; |
| 1164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | set_bit(__LINK_STATE_START, &dev->state); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1166 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1167 | if (ops->ndo_validate_addr) |
| 1168 | ret = ops->ndo_validate_addr(dev); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1169 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1170 | if (!ret && ops->ndo_open) |
| 1171 | ret = ops->ndo_open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1173 | if (ret) |
| 1174 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1175 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | dev->flags |= IFF_UP; |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1177 | net_dmaengine_get(); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 1178 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | dev_activate(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | } |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | return ret; |
| 1183 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1184 | |
| 1185 | /** |
| 1186 | * dev_open - prepare an interface for use. |
| 1187 | * @dev: device to open |
| 1188 | * |
| 1189 | * Takes a device from down to up state. The device's private open |
| 1190 | * function is invoked and then the multicast lists are loaded. Finally |
| 1191 | * the device is moved into the up state and a %NETDEV_UP message is |
| 1192 | * sent to the netdev notifier chain. |
| 1193 | * |
| 1194 | * Calling this function on an active interface is a nop. On a failure |
| 1195 | * a negative errno code is returned. |
| 1196 | */ |
| 1197 | int dev_open(struct net_device *dev) |
| 1198 | { |
| 1199 | int ret; |
| 1200 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1201 | if (dev->flags & IFF_UP) |
| 1202 | return 0; |
| 1203 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1204 | ret = __dev_open(dev); |
| 1205 | if (ret < 0) |
| 1206 | return ret; |
| 1207 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1208 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1209 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 1210 | |
| 1211 | return ret; |
| 1212 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1213 | EXPORT_SYMBOL(dev_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1215 | static int __dev_close_many(struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1217 | struct net_device *dev; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1218 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1219 | ASSERT_RTNL(); |
David S. Miller | 9d5010d | 2007-09-12 14:33:25 +0200 | [diff] [blame] | 1220 | might_sleep(); |
| 1221 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1222 | list_for_each_entry(dev, head, unreg_list) { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1223 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1225 | clear_bit(__LINK_STATE_START, &dev->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1227 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
| 1228 | * can be even on different cpu. So just clear netif_running(). |
| 1229 | * |
| 1230 | * dev->stop() will invoke napi_disable() on all of it's |
| 1231 | * napi_struct instances on this device. |
| 1232 | */ |
| 1233 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ |
| 1234 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1236 | dev_deactivate_many(head); |
| 1237 | |
| 1238 | list_for_each_entry(dev, head, unreg_list) { |
| 1239 | const struct net_device_ops *ops = dev->netdev_ops; |
| 1240 | |
| 1241 | /* |
| 1242 | * Call the device specific close. This cannot fail. |
| 1243 | * Only if device is UP |
| 1244 | * |
| 1245 | * We allow it to be called even after a DETACH hot-plug |
| 1246 | * event. |
| 1247 | */ |
| 1248 | if (ops->ndo_stop) |
| 1249 | ops->ndo_stop(dev); |
| 1250 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1251 | dev->flags &= ~IFF_UP; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1252 | net_dmaengine_put(); |
| 1253 | } |
| 1254 | |
| 1255 | return 0; |
| 1256 | } |
| 1257 | |
| 1258 | static int __dev_close(struct net_device *dev) |
| 1259 | { |
Linus Torvalds | f87e6f4 | 2011-02-17 22:54:38 +0000 | [diff] [blame] | 1260 | int retval; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1261 | LIST_HEAD(single); |
| 1262 | |
| 1263 | list_add(&dev->unreg_list, &single); |
Linus Torvalds | f87e6f4 | 2011-02-17 22:54:38 +0000 | [diff] [blame] | 1264 | retval = __dev_close_many(&single); |
| 1265 | list_del(&single); |
| 1266 | return retval; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1267 | } |
| 1268 | |
Eric Dumazet | 3fbd875 | 2011-01-19 21:23:22 +0000 | [diff] [blame] | 1269 | static int dev_close_many(struct list_head *head) |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1270 | { |
| 1271 | struct net_device *dev, *tmp; |
| 1272 | LIST_HEAD(tmp_list); |
| 1273 | |
| 1274 | list_for_each_entry_safe(dev, tmp, head, unreg_list) |
| 1275 | if (!(dev->flags & IFF_UP)) |
| 1276 | list_move(&dev->unreg_list, &tmp_list); |
| 1277 | |
| 1278 | __dev_close_many(head); |
Matti Linnanvuori | d8b2a4d | 2008-02-12 23:10:11 -0800 | [diff] [blame] | 1279 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1280 | list_for_each_entry(dev, head, unreg_list) { |
| 1281 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1282 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 1283 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 1285 | /* rollback_registered_many needs the complete original list */ |
| 1286 | list_splice(&tmp_list, head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | return 0; |
| 1288 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1289 | |
| 1290 | /** |
| 1291 | * dev_close - shutdown an interface. |
| 1292 | * @dev: device to shutdown |
| 1293 | * |
| 1294 | * This function moves an active device into down state. A |
| 1295 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device |
| 1296 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier |
| 1297 | * chain. |
| 1298 | */ |
| 1299 | int dev_close(struct net_device *dev) |
| 1300 | { |
Eric Dumazet | e14a599 | 2011-05-10 12:26:06 -0700 | [diff] [blame] | 1301 | if (dev->flags & IFF_UP) { |
| 1302 | LIST_HEAD(single); |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1303 | |
Eric Dumazet | e14a599 | 2011-05-10 12:26:06 -0700 | [diff] [blame] | 1304 | list_add(&dev->unreg_list, &single); |
| 1305 | dev_close_many(&single); |
| 1306 | list_del(&single); |
| 1307 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1308 | return 0; |
| 1309 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1310 | EXPORT_SYMBOL(dev_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
| 1312 | |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1313 | /** |
| 1314 | * dev_disable_lro - disable Large Receive Offload on a device |
| 1315 | * @dev: device |
| 1316 | * |
| 1317 | * Disable Large Receive Offload (LRO) on a net device. Must be |
| 1318 | * called under RTNL. This is needed if received packets may be |
| 1319 | * forwarded to another interface. |
| 1320 | */ |
| 1321 | void dev_disable_lro(struct net_device *dev) |
| 1322 | { |
Michał Mirosław | 2766051 | 2011-03-18 16:56:34 +0000 | [diff] [blame] | 1323 | u32 flags; |
| 1324 | |
Neil Horman | f11970e | 2011-05-24 08:31:09 +0000 | [diff] [blame] | 1325 | /* |
| 1326 | * If we're trying to disable lro on a vlan device |
| 1327 | * use the underlying physical device instead |
| 1328 | */ |
| 1329 | if (is_vlan_dev(dev)) |
| 1330 | dev = vlan_dev_real_dev(dev); |
| 1331 | |
Michał Mirosław | 2766051 | 2011-03-18 16:56:34 +0000 | [diff] [blame] | 1332 | if (dev->ethtool_ops && dev->ethtool_ops->get_flags) |
| 1333 | flags = dev->ethtool_ops->get_flags(dev); |
| 1334 | else |
| 1335 | flags = ethtool_op_get_flags(dev); |
| 1336 | |
| 1337 | if (!(flags & ETH_FLAG_LRO)) |
| 1338 | return; |
| 1339 | |
| 1340 | __ethtool_set_flags(dev, flags & ~ETH_FLAG_LRO); |
Michał Mirosław | 22d5969 | 2011-04-21 12:42:15 +0000 | [diff] [blame] | 1341 | if (unlikely(dev->features & NETIF_F_LRO)) |
| 1342 | netdev_WARN(dev, "failed to disable LRO!\n"); |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1343 | } |
| 1344 | EXPORT_SYMBOL(dev_disable_lro); |
| 1345 | |
| 1346 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1347 | static int dev_boot_phase = 1; |
| 1348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | /** |
| 1350 | * register_netdevice_notifier - register a network notifier block |
| 1351 | * @nb: notifier |
| 1352 | * |
| 1353 | * Register a notifier to be called when network device events occur. |
| 1354 | * The notifier passed is linked into the kernel structures and must |
| 1355 | * not be reused until it has been unregistered. A negative errno code |
| 1356 | * is returned on a failure. |
| 1357 | * |
| 1358 | * When registered all registration and up events are replayed |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1359 | * to the new notifier to allow device to have a race free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | * view of the network device list. |
| 1361 | */ |
| 1362 | |
| 1363 | int register_netdevice_notifier(struct notifier_block *nb) |
| 1364 | { |
| 1365 | struct net_device *dev; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1366 | struct net_device *last; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1367 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | int err; |
| 1369 | |
| 1370 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1371 | err = raw_notifier_chain_register(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1372 | if (err) |
| 1373 | goto unlock; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1374 | if (dev_boot_phase) |
| 1375 | goto unlock; |
| 1376 | for_each_net(net) { |
| 1377 | for_each_netdev(net, dev) { |
| 1378 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); |
| 1379 | err = notifier_to_errno(err); |
| 1380 | if (err) |
| 1381 | goto rollback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1383 | if (!(dev->flags & IFF_UP)) |
| 1384 | continue; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1385 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1386 | nb->notifier_call(nb, NETDEV_UP, dev); |
| 1387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1389 | |
| 1390 | unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | rtnl_unlock(); |
| 1392 | return err; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1393 | |
| 1394 | rollback: |
| 1395 | last = dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1396 | for_each_net(net) { |
| 1397 | for_each_netdev(net, dev) { |
| 1398 | if (dev == last) |
| 1399 | break; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1400 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1401 | if (dev->flags & IFF_UP) { |
| 1402 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); |
| 1403 | nb->notifier_call(nb, NETDEV_DOWN, dev); |
| 1404 | } |
| 1405 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 1406 | nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1407 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1408 | } |
Pavel Emelyanov | c67625a | 2007-11-14 15:53:16 -0800 | [diff] [blame] | 1409 | |
| 1410 | raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1411 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1413 | EXPORT_SYMBOL(register_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | |
| 1415 | /** |
| 1416 | * unregister_netdevice_notifier - unregister a network notifier block |
| 1417 | * @nb: notifier |
| 1418 | * |
| 1419 | * Unregister a notifier previously registered by |
| 1420 | * register_netdevice_notifier(). The notifier is unlinked into the |
| 1421 | * kernel structures and may then be reused. A negative errno code |
| 1422 | * is returned on a failure. |
| 1423 | */ |
| 1424 | |
| 1425 | int unregister_netdevice_notifier(struct notifier_block *nb) |
| 1426 | { |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1427 | int err; |
| 1428 | |
| 1429 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1430 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1431 | rtnl_unlock(); |
| 1432 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1434 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
| 1436 | /** |
| 1437 | * call_netdevice_notifiers - call all network notifier blocks |
| 1438 | * @val: value passed unmodified to notifier function |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1439 | * @dev: net_device pointer passed unmodified to notifier function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | * |
| 1441 | * Call all network notifier blocks. Parameters and return value |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1442 | * are as for raw_notifier_call_chain(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | */ |
| 1444 | |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1445 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | { |
Jiri Pirko | ab93047 | 2010-04-20 01:45:37 -0700 | [diff] [blame] | 1447 | ASSERT_RTNL(); |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1448 | return raw_notifier_call_chain(&netdev_chain, val, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | } |
stephen hemminger | edf947f | 2011-03-24 13:24:01 +0000 | [diff] [blame] | 1450 | EXPORT_SYMBOL(call_netdevice_notifiers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | |
| 1452 | /* When > 0 there are consumers of rx skb time stamps */ |
| 1453 | static atomic_t netstamp_needed = ATOMIC_INIT(0); |
| 1454 | |
| 1455 | void net_enable_timestamp(void) |
| 1456 | { |
| 1457 | atomic_inc(&netstamp_needed); |
| 1458 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1459 | EXPORT_SYMBOL(net_enable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | |
| 1461 | void net_disable_timestamp(void) |
| 1462 | { |
| 1463 | atomic_dec(&netstamp_needed); |
| 1464 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1465 | EXPORT_SYMBOL(net_disable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1467 | static inline void net_timestamp_set(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | { |
| 1469 | if (atomic_read(&netstamp_needed)) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1470 | __net_timestamp(skb); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1471 | else |
| 1472 | skb->tstamp.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1475 | static inline void net_timestamp_check(struct sk_buff *skb) |
| 1476 | { |
| 1477 | if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed)) |
| 1478 | __net_timestamp(skb); |
| 1479 | } |
| 1480 | |
Richard Cochran | 4dc360c | 2011-10-19 17:00:35 -0400 | [diff] [blame] | 1481 | static int net_hwtstamp_validate(struct ifreq *ifr) |
| 1482 | { |
| 1483 | struct hwtstamp_config cfg; |
| 1484 | enum hwtstamp_tx_types tx_type; |
| 1485 | enum hwtstamp_rx_filters rx_filter; |
| 1486 | int tx_type_valid = 0; |
| 1487 | int rx_filter_valid = 0; |
| 1488 | |
| 1489 | if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) |
| 1490 | return -EFAULT; |
| 1491 | |
| 1492 | if (cfg.flags) /* reserved for future extensions */ |
| 1493 | return -EINVAL; |
| 1494 | |
| 1495 | tx_type = cfg.tx_type; |
| 1496 | rx_filter = cfg.rx_filter; |
| 1497 | |
| 1498 | switch (tx_type) { |
| 1499 | case HWTSTAMP_TX_OFF: |
| 1500 | case HWTSTAMP_TX_ON: |
| 1501 | case HWTSTAMP_TX_ONESTEP_SYNC: |
| 1502 | tx_type_valid = 1; |
| 1503 | break; |
| 1504 | } |
| 1505 | |
| 1506 | switch (rx_filter) { |
| 1507 | case HWTSTAMP_FILTER_NONE: |
| 1508 | case HWTSTAMP_FILTER_ALL: |
| 1509 | case HWTSTAMP_FILTER_SOME: |
| 1510 | case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: |
| 1511 | case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: |
| 1512 | case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: |
| 1513 | case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: |
| 1514 | case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: |
| 1515 | case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: |
| 1516 | case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: |
| 1517 | case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: |
| 1518 | case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: |
| 1519 | case HWTSTAMP_FILTER_PTP_V2_EVENT: |
| 1520 | case HWTSTAMP_FILTER_PTP_V2_SYNC: |
| 1521 | case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: |
| 1522 | rx_filter_valid = 1; |
| 1523 | break; |
| 1524 | } |
| 1525 | |
| 1526 | if (!tx_type_valid || !rx_filter_valid) |
| 1527 | return -ERANGE; |
| 1528 | |
| 1529 | return 0; |
| 1530 | } |
| 1531 | |
Daniel Lezcano | 79b569f | 2011-03-30 02:42:17 -0700 | [diff] [blame] | 1532 | static inline bool is_skb_forwardable(struct net_device *dev, |
| 1533 | struct sk_buff *skb) |
| 1534 | { |
| 1535 | unsigned int len; |
| 1536 | |
| 1537 | if (!(dev->flags & IFF_UP)) |
| 1538 | return false; |
| 1539 | |
| 1540 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; |
| 1541 | if (skb->len <= len) |
| 1542 | return true; |
| 1543 | |
| 1544 | /* if TSO is enabled, we don't care about the length as the packet |
| 1545 | * could be forwarded without being segmented before |
| 1546 | */ |
| 1547 | if (skb_is_gso(skb)) |
| 1548 | return true; |
| 1549 | |
| 1550 | return false; |
| 1551 | } |
| 1552 | |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1553 | /** |
| 1554 | * dev_forward_skb - loopback an skb to another netif |
| 1555 | * |
| 1556 | * @dev: destination network device |
| 1557 | * @skb: buffer to forward |
| 1558 | * |
| 1559 | * return values: |
| 1560 | * NET_RX_SUCCESS (no congestion) |
Eric Dumazet | 6ec82562 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1561 | * NET_RX_DROP (packet was dropped, but freed) |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1562 | * |
| 1563 | * dev_forward_skb can be used for injecting an skb from the |
| 1564 | * start_xmit function of one device into the receive queue |
| 1565 | * of another device. |
| 1566 | * |
| 1567 | * The receiving device may be in another namespace, so |
| 1568 | * we have to clear all information in the skb that could |
| 1569 | * impact namespace isolation. |
| 1570 | */ |
| 1571 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
| 1572 | { |
Michael S. Tsirkin | 48c8301 | 2011-08-31 08:03:29 +0000 | [diff] [blame] | 1573 | if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { |
| 1574 | if (skb_copy_ubufs(skb, GFP_ATOMIC)) { |
| 1575 | atomic_long_inc(&dev->rx_dropped); |
| 1576 | kfree_skb(skb); |
| 1577 | return NET_RX_DROP; |
| 1578 | } |
| 1579 | } |
| 1580 | |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1581 | skb_orphan(skb); |
Ben Greear | c736eef | 2010-07-22 09:54:47 +0000 | [diff] [blame] | 1582 | nf_reset(skb); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1583 | |
Daniel Lezcano | 79b569f | 2011-03-30 02:42:17 -0700 | [diff] [blame] | 1584 | if (unlikely(!is_skb_forwardable(dev, skb))) { |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 1585 | atomic_long_inc(&dev->rx_dropped); |
Eric Dumazet | 6ec82562 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1586 | kfree_skb(skb); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1587 | return NET_RX_DROP; |
Eric Dumazet | 6ec82562 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1588 | } |
Arnd Bergmann | 8a83a00 | 2010-01-30 12:23:03 +0000 | [diff] [blame] | 1589 | skb_set_dev(skb, dev); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1590 | skb->tstamp.tv64 = 0; |
| 1591 | skb->pkt_type = PACKET_HOST; |
| 1592 | skb->protocol = eth_type_trans(skb, dev); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1593 | return netif_rx(skb); |
| 1594 | } |
| 1595 | EXPORT_SYMBOL_GPL(dev_forward_skb); |
| 1596 | |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1597 | static inline int deliver_skb(struct sk_buff *skb, |
| 1598 | struct packet_type *pt_prev, |
| 1599 | struct net_device *orig_dev) |
| 1600 | { |
| 1601 | atomic_inc(&skb->users); |
| 1602 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
| 1603 | } |
| 1604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | /* |
| 1606 | * Support routine. Sends outgoing frames to any network |
| 1607 | * taps currently in use. |
| 1608 | */ |
| 1609 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1610 | 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] | 1611 | { |
| 1612 | struct packet_type *ptype; |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1613 | struct sk_buff *skb2 = NULL; |
| 1614 | struct packet_type *pt_prev = NULL; |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | rcu_read_lock(); |
| 1617 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 1618 | /* Never send packets back to the socket |
| 1619 | * they originated from - MvS (miquels@drinkel.ow.org) |
| 1620 | */ |
| 1621 | if ((ptype->dev == dev || !ptype->dev) && |
| 1622 | (ptype->af_packet_priv == NULL || |
| 1623 | (struct sock *)ptype->af_packet_priv != skb->sk)) { |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1624 | if (pt_prev) { |
| 1625 | deliver_skb(skb2, pt_prev, skb->dev); |
| 1626 | pt_prev = ptype; |
| 1627 | continue; |
| 1628 | } |
| 1629 | |
| 1630 | skb2 = skb_clone(skb, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | if (!skb2) |
| 1632 | break; |
| 1633 | |
Eric Dumazet | 7097818 | 2010-12-20 21:22:51 +0000 | [diff] [blame] | 1634 | net_timestamp_set(skb2); |
| 1635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | /* skb->nh should be correctly |
| 1637 | set by sender, so that the second statement is |
| 1638 | just protection against buggy protocols. |
| 1639 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1640 | skb_reset_mac_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1642 | if (skb_network_header(skb2) < skb2->data || |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1643 | skb2->network_header > skb2->tail) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | if (net_ratelimit()) |
| 1645 | printk(KERN_CRIT "protocol %04x is " |
| 1646 | "buggy, dev %s\n", |
Sebastian Andrzej Siewior | 70777d0 | 2010-06-30 10:39:19 -0700 | [diff] [blame] | 1647 | ntohs(skb2->protocol), |
| 1648 | dev->name); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1649 | skb_reset_network_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | } |
| 1651 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1652 | skb2->transport_header = skb2->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | skb2->pkt_type = PACKET_OUTGOING; |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1654 | pt_prev = ptype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | } |
| 1656 | } |
Changli Gao | 71d9dec | 2010-12-15 19:57:25 +0000 | [diff] [blame] | 1657 | if (pt_prev) |
| 1658 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | rcu_read_unlock(); |
| 1660 | } |
| 1661 | |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 1662 | /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change |
| 1663 | * @dev: Network device |
| 1664 | * @txq: number of queues available |
| 1665 | * |
| 1666 | * If real_num_tx_queues is changed the tc mappings may no longer be |
| 1667 | * valid. To resolve this verify the tc mapping remains valid and if |
| 1668 | * not NULL the mapping. With no priorities mapping to this |
| 1669 | * offset/count pair it will no longer be used. In the worst case TC0 |
| 1670 | * is invalid nothing can be done so disable priority mappings. If is |
| 1671 | * expected that drivers will fix this mapping if they can before |
| 1672 | * calling netif_set_real_num_tx_queues. |
| 1673 | */ |
Eric Dumazet | bb134d2 | 2011-01-20 19:18:08 +0000 | [diff] [blame] | 1674 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 1675 | { |
| 1676 | int i; |
| 1677 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; |
| 1678 | |
| 1679 | /* If TC0 is invalidated disable TC mapping */ |
| 1680 | if (tc->offset + tc->count > txq) { |
| 1681 | pr_warning("Number of in use tx queues changed " |
| 1682 | "invalidating tc mappings. Priority " |
| 1683 | "traffic classification disabled!\n"); |
| 1684 | dev->num_tc = 0; |
| 1685 | return; |
| 1686 | } |
| 1687 | |
| 1688 | /* Invalidated prio to tc mappings set to TC0 */ |
| 1689 | for (i = 1; i < TC_BITMASK + 1; i++) { |
| 1690 | int q = netdev_get_prio_tc_map(dev, i); |
| 1691 | |
| 1692 | tc = &dev->tc_to_txq[q]; |
| 1693 | if (tc->offset + tc->count > txq) { |
| 1694 | pr_warning("Number of in use tx queues " |
| 1695 | "changed. Priority %i to tc " |
| 1696 | "mapping %i is no longer valid " |
| 1697 | "setting map to 0\n", |
| 1698 | i, q); |
| 1699 | netdev_set_prio_tc_map(dev, i, 0); |
| 1700 | } |
| 1701 | } |
| 1702 | } |
| 1703 | |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 1704 | /* |
| 1705 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues |
| 1706 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. |
| 1707 | */ |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 1708 | 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] | 1709 | { |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 1710 | int rc; |
| 1711 | |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 1712 | if (txq < 1 || txq > dev->num_tx_queues) |
| 1713 | return -EINVAL; |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 1714 | |
Ben Hutchings | 5c56580 | 2011-02-15 19:39:21 +0000 | [diff] [blame] | 1715 | if (dev->reg_state == NETREG_REGISTERED || |
| 1716 | dev->reg_state == NETREG_UNREGISTERING) { |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 1717 | ASSERT_RTNL(); |
| 1718 | |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 1719 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
| 1720 | txq); |
Tom Herbert | bf26414 | 2010-11-26 08:36:09 +0000 | [diff] [blame] | 1721 | if (rc) |
| 1722 | return rc; |
| 1723 | |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 1724 | if (dev->num_tc) |
| 1725 | netif_setup_tc(dev, txq); |
| 1726 | |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 1727 | if (txq < dev->real_num_tx_queues) |
| 1728 | qdisc_reset_all_tx_gt(dev, txq); |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 1729 | } |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 1730 | |
| 1731 | dev->real_num_tx_queues = txq; |
| 1732 | return 0; |
John Fastabend | f0796d5 | 2010-07-01 13:21:57 +0000 | [diff] [blame] | 1733 | } |
| 1734 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1735 | |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 1736 | #ifdef CONFIG_RPS |
| 1737 | /** |
| 1738 | * netif_set_real_num_rx_queues - set actual number of RX queues used |
| 1739 | * @dev: Network device |
| 1740 | * @rxq: Actual number of RX queues |
| 1741 | * |
| 1742 | * This must be called either with the rtnl_lock held or before |
| 1743 | * registration of the net device. Returns 0 on success, or a |
Ben Hutchings | 4e7f795 | 2010-10-08 10:33:39 -0700 | [diff] [blame] | 1744 | * negative error code. If called before registration, it always |
| 1745 | * succeeds. |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 1746 | */ |
| 1747 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) |
| 1748 | { |
| 1749 | int rc; |
| 1750 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 1751 | if (rxq < 1 || rxq > dev->num_rx_queues) |
| 1752 | return -EINVAL; |
| 1753 | |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 1754 | if (dev->reg_state == NETREG_REGISTERED) { |
| 1755 | ASSERT_RTNL(); |
| 1756 | |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 1757 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
| 1758 | rxq); |
| 1759 | if (rc) |
| 1760 | return rc; |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 1761 | } |
| 1762 | |
| 1763 | dev->real_num_rx_queues = rxq; |
| 1764 | return 0; |
| 1765 | } |
| 1766 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); |
| 1767 | #endif |
| 1768 | |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1769 | static inline void __netif_reschedule(struct Qdisc *q) |
| 1770 | { |
| 1771 | struct softnet_data *sd; |
| 1772 | unsigned long flags; |
| 1773 | |
| 1774 | local_irq_save(flags); |
| 1775 | sd = &__get_cpu_var(softnet_data); |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 1776 | q->next_sched = NULL; |
| 1777 | *sd->output_queue_tailp = q; |
| 1778 | sd->output_queue_tailp = &q->next_sched; |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1779 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1780 | local_irq_restore(flags); |
| 1781 | } |
| 1782 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 1783 | void __netif_schedule(struct Qdisc *q) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1784 | { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1785 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) |
| 1786 | __netif_reschedule(q); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1787 | } |
| 1788 | EXPORT_SYMBOL(__netif_schedule); |
| 1789 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1790 | void dev_kfree_skb_irq(struct sk_buff *skb) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1791 | { |
David S. Miller | 3578b0c | 2010-08-03 00:24:04 -0700 | [diff] [blame] | 1792 | if (atomic_dec_and_test(&skb->users)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1793 | struct softnet_data *sd; |
| 1794 | unsigned long flags; |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1795 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1796 | local_irq_save(flags); |
| 1797 | sd = &__get_cpu_var(softnet_data); |
| 1798 | skb->next = sd->completion_queue; |
| 1799 | sd->completion_queue = skb; |
| 1800 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1801 | local_irq_restore(flags); |
| 1802 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1803 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1804 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1805 | |
| 1806 | void dev_kfree_skb_any(struct sk_buff *skb) |
| 1807 | { |
| 1808 | if (in_irq() || irqs_disabled()) |
| 1809 | dev_kfree_skb_irq(skb); |
| 1810 | else |
| 1811 | dev_kfree_skb(skb); |
| 1812 | } |
| 1813 | EXPORT_SYMBOL(dev_kfree_skb_any); |
| 1814 | |
| 1815 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1816 | /** |
| 1817 | * netif_device_detach - mark device as removed |
| 1818 | * @dev: network device |
| 1819 | * |
| 1820 | * Mark device as removed from system and therefore no longer available. |
| 1821 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1822 | void netif_device_detach(struct net_device *dev) |
| 1823 | { |
| 1824 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1825 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1826 | netif_tx_stop_all_queues(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1827 | } |
| 1828 | } |
| 1829 | EXPORT_SYMBOL(netif_device_detach); |
| 1830 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1831 | /** |
| 1832 | * netif_device_attach - mark device as attached |
| 1833 | * @dev: network device |
| 1834 | * |
| 1835 | * Mark device as attached from system and restart if needed. |
| 1836 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1837 | void netif_device_attach(struct net_device *dev) |
| 1838 | { |
| 1839 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1840 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1841 | netif_tx_wake_all_queues(dev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1842 | __netdev_watchdog_up(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1843 | } |
| 1844 | } |
| 1845 | EXPORT_SYMBOL(netif_device_attach); |
| 1846 | |
Arnd Bergmann | 8a83a00 | 2010-01-30 12:23:03 +0000 | [diff] [blame] | 1847 | /** |
| 1848 | * skb_dev_set -- assign a new device to a buffer |
| 1849 | * @skb: buffer for the new device |
| 1850 | * @dev: network device |
| 1851 | * |
| 1852 | * If an skb is owned by a device already, we have to reset |
| 1853 | * all data private to the namespace a device belongs to |
| 1854 | * before assigning it a new device. |
| 1855 | */ |
| 1856 | #ifdef CONFIG_NET_NS |
| 1857 | void skb_set_dev(struct sk_buff *skb, struct net_device *dev) |
| 1858 | { |
| 1859 | skb_dst_drop(skb); |
| 1860 | if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) { |
| 1861 | secpath_reset(skb); |
| 1862 | nf_reset(skb); |
| 1863 | skb_init_secmark(skb); |
| 1864 | skb->mark = 0; |
| 1865 | skb->priority = 0; |
| 1866 | skb->nf_trace = 0; |
| 1867 | skb->ipvs_property = 0; |
| 1868 | #ifdef CONFIG_NET_SCHED |
| 1869 | skb->tc_index = 0; |
| 1870 | #endif |
| 1871 | } |
| 1872 | skb->dev = dev; |
| 1873 | } |
| 1874 | EXPORT_SYMBOL(skb_set_dev); |
| 1875 | #endif /* CONFIG_NET_NS */ |
| 1876 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | /* |
| 1878 | * Invalidate hardware checksum when packet is to be mangled, and |
| 1879 | * complete checksum manually on outgoing path. |
| 1880 | */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1881 | int skb_checksum_help(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | { |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 1883 | __wsum csum; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 1884 | int ret = 0, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1886 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1887 | goto out_set_summed; |
| 1888 | |
| 1889 | if (unlikely(skb_shinfo(skb)->gso_size)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1890 | /* Let GSO fix up the checksum. */ |
| 1891 | goto out_set_summed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | } |
| 1893 | |
Michał Mirosław | 55508d6 | 2010-12-14 15:24:08 +0000 | [diff] [blame] | 1894 | offset = skb_checksum_start_offset(skb); |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1895 | BUG_ON(offset >= skb_headlen(skb)); |
| 1896 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 1897 | |
| 1898 | offset += skb->csum_offset; |
| 1899 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); |
| 1900 | |
| 1901 | if (skb_cloned(skb) && |
| 1902 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
| 1904 | if (ret) |
| 1905 | goto out; |
| 1906 | } |
| 1907 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1908 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1909 | out_set_summed: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | skb->ip_summed = CHECKSUM_NONE; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1911 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | return ret; |
| 1913 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1914 | EXPORT_SYMBOL(skb_checksum_help); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1915 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1916 | /** |
| 1917 | * skb_gso_segment - Perform segmentation on skb. |
| 1918 | * @skb: buffer to segment |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1919 | * @features: features for the output path (see dev->features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1920 | * |
| 1921 | * This function segments the given skb and returns a list of segments. |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1922 | * |
| 1923 | * It may return NULL if the skb requires no segmentation. This is |
| 1924 | * only possible when GSO is used for verifying header integrity. |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1925 | */ |
Michał Mirosław | 04ed3e7 | 2011-01-24 15:32:47 -0800 | [diff] [blame] | 1926 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1927 | { |
| 1928 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); |
| 1929 | struct packet_type *ptype; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 1930 | __be16 type = skb->protocol; |
Jesse Gross | c8d5bcd | 2010-10-29 12:14:54 +0000 | [diff] [blame] | 1931 | int vlan_depth = ETH_HLEN; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1932 | int err; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1933 | |
Jesse Gross | c8d5bcd | 2010-10-29 12:14:54 +0000 | [diff] [blame] | 1934 | while (type == htons(ETH_P_8021Q)) { |
| 1935 | struct vlan_hdr *vh; |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 1936 | |
Jesse Gross | c8d5bcd | 2010-10-29 12:14:54 +0000 | [diff] [blame] | 1937 | if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN))) |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 1938 | return ERR_PTR(-EINVAL); |
| 1939 | |
Jesse Gross | c8d5bcd | 2010-10-29 12:14:54 +0000 | [diff] [blame] | 1940 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); |
| 1941 | type = vh->h_vlan_encapsulated_proto; |
| 1942 | vlan_depth += VLAN_HLEN; |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 1943 | } |
| 1944 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1945 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1946 | skb->mac_len = skb->network_header - skb->mac_header; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1947 | __skb_pull(skb, skb->mac_len); |
| 1948 | |
Herbert Xu | 67fd1a7 | 2009-01-19 16:26:44 -0800 | [diff] [blame] | 1949 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
| 1950 | struct net_device *dev = skb->dev; |
| 1951 | struct ethtool_drvinfo info = {}; |
| 1952 | |
| 1953 | if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo) |
| 1954 | dev->ethtool_ops->get_drvinfo(dev, &info); |
| 1955 | |
Joe Perches | b194a36 | 2010-10-30 11:08:52 +0000 | [diff] [blame] | 1956 | WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n", |
Herbert Xu | 67fd1a7 | 2009-01-19 16:26:44 -0800 | [diff] [blame] | 1957 | info.driver, dev ? dev->features : 0L, |
| 1958 | skb->sk ? skb->sk->sk_route_caps : 0L, |
| 1959 | skb->len, skb->data_len, skb->ip_summed); |
| 1960 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1961 | if (skb_header_cloned(skb) && |
| 1962 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) |
| 1963 | return ERR_PTR(err); |
| 1964 | } |
| 1965 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1966 | rcu_read_lock(); |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 1967 | list_for_each_entry_rcu(ptype, |
| 1968 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1969 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1970 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1971 | err = ptype->gso_send_check(skb); |
| 1972 | segs = ERR_PTR(err); |
| 1973 | if (err || skb_gso_ok(skb, features)) |
| 1974 | break; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1975 | __skb_push(skb, (skb->data - |
| 1976 | skb_network_header(skb))); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1977 | } |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1978 | segs = ptype->gso_segment(skb, features); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1979 | break; |
| 1980 | } |
| 1981 | } |
| 1982 | rcu_read_unlock(); |
| 1983 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1984 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1985 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1986 | return segs; |
| 1987 | } |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1988 | EXPORT_SYMBOL(skb_gso_segment); |
| 1989 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1990 | /* Take action when hardware reception checksum errors are detected. */ |
| 1991 | #ifdef CONFIG_BUG |
| 1992 | void netdev_rx_csum_fault(struct net_device *dev) |
| 1993 | { |
| 1994 | if (net_ratelimit()) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1995 | printk(KERN_ERR "%s: hw csum failure.\n", |
Stephen Hemminger | 246a421 | 2005-12-08 15:21:39 -0800 | [diff] [blame] | 1996 | dev ? dev->name : "<unknown>"); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1997 | dump_stack(); |
| 1998 | } |
| 1999 | } |
| 2000 | EXPORT_SYMBOL(netdev_rx_csum_fault); |
| 2001 | #endif |
| 2002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | /* Actually, we should eliminate this check as soon as we know, that: |
| 2004 | * 1. IOMMU is present and allows to map all the memory. |
| 2005 | * 2. No high memory really exists on this machine. |
| 2006 | */ |
| 2007 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 2008 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | { |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 2010 | #ifdef CONFIG_HIGHMEM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | int i; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2012 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 2013 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 2014 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| 2015 | if (PageHighMem(skb_frag_page(frag))) |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2016 | return 1; |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 2017 | } |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2018 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2020 | if (PCI_DMA_BUS_IS_PHYS) { |
| 2021 | struct device *pdev = dev->dev.parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 2023 | if (!pdev) |
| 2024 | return 0; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2025 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 2026 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| 2027 | dma_addr_t addr = page_to_phys(skb_frag_page(frag)); |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 2028 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
| 2029 | return 1; |
| 2030 | } |
| 2031 | } |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 2032 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | return 0; |
| 2034 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2036 | struct dev_gso_cb { |
| 2037 | void (*destructor)(struct sk_buff *skb); |
| 2038 | }; |
| 2039 | |
| 2040 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) |
| 2041 | |
| 2042 | static void dev_gso_skb_destructor(struct sk_buff *skb) |
| 2043 | { |
| 2044 | struct dev_gso_cb *cb; |
| 2045 | |
| 2046 | do { |
| 2047 | struct sk_buff *nskb = skb->next; |
| 2048 | |
| 2049 | skb->next = nskb->next; |
| 2050 | nskb->next = NULL; |
| 2051 | kfree_skb(nskb); |
| 2052 | } while (skb->next); |
| 2053 | |
| 2054 | cb = DEV_GSO_CB(skb); |
| 2055 | if (cb->destructor) |
| 2056 | cb->destructor(skb); |
| 2057 | } |
| 2058 | |
| 2059 | /** |
| 2060 | * dev_gso_segment - Perform emulated hardware segmentation on skb. |
| 2061 | * @skb: buffer to segment |
Jesse Gross | 91ecb63 | 2011-01-09 06:23:33 +0000 | [diff] [blame] | 2062 | * @features: device features as applicable to this skb |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2063 | * |
| 2064 | * This function segments the given skb and stores the list of segments |
| 2065 | * in skb->next. |
| 2066 | */ |
Jesse Gross | 91ecb63 | 2011-01-09 06:23:33 +0000 | [diff] [blame] | 2067 | static int dev_gso_segment(struct sk_buff *skb, int features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2068 | { |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2069 | struct sk_buff *segs; |
| 2070 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2071 | segs = skb_gso_segment(skb, features); |
| 2072 | |
| 2073 | /* Verifying header integrity only. */ |
| 2074 | if (!segs) |
| 2075 | return 0; |
| 2076 | |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 2077 | if (IS_ERR(segs)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2078 | return PTR_ERR(segs); |
| 2079 | |
| 2080 | skb->next = segs; |
| 2081 | DEV_GSO_CB(skb)->destructor = skb->destructor; |
| 2082 | skb->destructor = dev_gso_skb_destructor; |
| 2083 | |
| 2084 | return 0; |
| 2085 | } |
| 2086 | |
Eric Dumazet | fc6055a | 2010-04-16 12:18:22 +0000 | [diff] [blame] | 2087 | /* |
| 2088 | * Try to orphan skb early, right before transmission by the device. |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 2089 | * We cannot orphan skb if tx timestamp is requested or the sk-reference |
| 2090 | * is needed on driver level for other reasons, e.g. see net/can/raw.c |
Eric Dumazet | fc6055a | 2010-04-16 12:18:22 +0000 | [diff] [blame] | 2091 | */ |
| 2092 | static inline void skb_orphan_try(struct sk_buff *skb) |
| 2093 | { |
Eric Dumazet | 87fd308 | 2010-07-13 05:24:20 +0000 | [diff] [blame] | 2094 | struct sock *sk = skb->sk; |
| 2095 | |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 2096 | if (sk && !skb_shinfo(skb)->tx_flags) { |
Eric Dumazet | 87fd308 | 2010-07-13 05:24:20 +0000 | [diff] [blame] | 2097 | /* skb_tx_hash() wont be able to get sk. |
| 2098 | * We copy sk_hash into skb->rxhash |
| 2099 | */ |
| 2100 | if (!skb->rxhash) |
| 2101 | skb->rxhash = sk->sk_hash; |
Eric Dumazet | fc6055a | 2010-04-16 12:18:22 +0000 | [diff] [blame] | 2102 | skb_orphan(skb); |
Eric Dumazet | 87fd308 | 2010-07-13 05:24:20 +0000 | [diff] [blame] | 2103 | } |
Eric Dumazet | fc6055a | 2010-04-16 12:18:22 +0000 | [diff] [blame] | 2104 | } |
| 2105 | |
Jesse Gross | 0363466 | 2011-01-09 06:23:35 +0000 | [diff] [blame] | 2106 | static bool can_checksum_protocol(unsigned long features, __be16 protocol) |
| 2107 | { |
| 2108 | return ((features & NETIF_F_GEN_CSUM) || |
| 2109 | ((features & NETIF_F_V4_CSUM) && |
| 2110 | protocol == htons(ETH_P_IP)) || |
| 2111 | ((features & NETIF_F_V6_CSUM) && |
| 2112 | protocol == htons(ETH_P_IPV6)) || |
| 2113 | ((features & NETIF_F_FCOE_CRC) && |
| 2114 | protocol == htons(ETH_P_FCOE))); |
| 2115 | } |
| 2116 | |
Michał Mirosław | 04ed3e7 | 2011-01-24 15:32:47 -0800 | [diff] [blame] | 2117 | static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features) |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2118 | { |
Eric Dumazet | d402786 | 2011-01-19 00:51:36 +0000 | [diff] [blame] | 2119 | if (!can_checksum_protocol(features, protocol)) { |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2120 | features &= ~NETIF_F_ALL_CSUM; |
| 2121 | features &= ~NETIF_F_SG; |
| 2122 | } else if (illegal_highdma(skb->dev, skb)) { |
| 2123 | features &= ~NETIF_F_SG; |
| 2124 | } |
| 2125 | |
| 2126 | return features; |
| 2127 | } |
| 2128 | |
Michał Mirosław | 04ed3e7 | 2011-01-24 15:32:47 -0800 | [diff] [blame] | 2129 | u32 netif_skb_features(struct sk_buff *skb) |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2130 | { |
| 2131 | __be16 protocol = skb->protocol; |
Michał Mirosław | 04ed3e7 | 2011-01-24 15:32:47 -0800 | [diff] [blame] | 2132 | u32 features = skb->dev->features; |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2133 | |
| 2134 | if (protocol == htons(ETH_P_8021Q)) { |
| 2135 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
| 2136 | protocol = veh->h_vlan_encapsulated_proto; |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2137 | } else if (!vlan_tx_tag_present(skb)) { |
| 2138 | return harmonize_features(skb, protocol, features); |
| 2139 | } |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2140 | |
Jesse Gross | 6ee400a | 2011-01-17 20:46:00 +0000 | [diff] [blame] | 2141 | features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX); |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2142 | |
| 2143 | if (protocol != htons(ETH_P_8021Q)) { |
| 2144 | return harmonize_features(skb, protocol, features); |
| 2145 | } else { |
| 2146 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | |
Jesse Gross | 6ee400a | 2011-01-17 20:46:00 +0000 | [diff] [blame] | 2147 | NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX; |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2148 | return harmonize_features(skb, protocol, features); |
| 2149 | } |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2150 | } |
Jesse Gross | f01a523 | 2011-01-09 06:23:31 +0000 | [diff] [blame] | 2151 | EXPORT_SYMBOL(netif_skb_features); |
Jesse Gross | 58e998c | 2010-10-29 12:14:55 +0000 | [diff] [blame] | 2152 | |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2153 | /* |
| 2154 | * Returns true if either: |
| 2155 | * 1. skb has frag_list and the device doesn't support FRAGLIST, or |
| 2156 | * 2. skb is fragmented and the device does not support SG, or if |
| 2157 | * at least one of fragments is in highmem and device does not |
| 2158 | * support DMA from it. |
| 2159 | */ |
| 2160 | static inline int skb_needs_linearize(struct sk_buff *skb, |
Jesse Gross | 02932ce | 2011-01-09 06:23:34 +0000 | [diff] [blame] | 2161 | int features) |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2162 | { |
Jesse Gross | 02932ce | 2011-01-09 06:23:34 +0000 | [diff] [blame] | 2163 | return skb_is_nonlinear(skb) && |
| 2164 | ((skb_has_frag_list(skb) && |
| 2165 | !(features & NETIF_F_FRAGLIST)) || |
Jesse Gross | e1e78db | 2010-10-29 12:14:53 +0000 | [diff] [blame] | 2166 | (skb_shinfo(skb)->nr_frags && |
Jesse Gross | 02932ce | 2011-01-09 06:23:34 +0000 | [diff] [blame] | 2167 | !(features & NETIF_F_SG))); |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2168 | } |
| 2169 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2170 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
| 2171 | struct netdev_queue *txq) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2172 | { |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 2173 | const struct net_device_ops *ops = dev->netdev_ops; |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2174 | int rc = NETDEV_TX_OK; |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2175 | unsigned int skb_len; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 2176 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2177 | if (likely(!skb->next)) { |
Michał Mirosław | 04ed3e7 | 2011-01-24 15:32:47 -0800 | [diff] [blame] | 2178 | u32 features; |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 2179 | |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 2180 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2181 | * If device doesn't need skb->dst, release it right now while |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 2182 | * its hot in this cpu cache |
| 2183 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 2184 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 2185 | skb_dst_drop(skb); |
| 2186 | |
Eric Dumazet | 15c2d75f | 2010-12-07 00:30:37 +0000 | [diff] [blame] | 2187 | if (!list_empty(&ptype_all)) |
| 2188 | dev_queue_xmit_nit(skb, dev); |
| 2189 | |
Eric Dumazet | fc6055a | 2010-04-16 12:18:22 +0000 | [diff] [blame] | 2190 | skb_orphan_try(skb); |
David S. Miller | 9ccb897 | 2010-04-22 01:02:07 -0700 | [diff] [blame] | 2191 | |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 2192 | features = netif_skb_features(skb); |
| 2193 | |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 2194 | if (vlan_tx_tag_present(skb) && |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 2195 | !(features & NETIF_F_HW_VLAN_TX)) { |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 2196 | skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb)); |
| 2197 | if (unlikely(!skb)) |
| 2198 | goto out; |
| 2199 | |
| 2200 | skb->vlan_tci = 0; |
| 2201 | } |
| 2202 | |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 2203 | if (netif_needs_gso(skb, features)) { |
Jesse Gross | 91ecb63 | 2011-01-09 06:23:33 +0000 | [diff] [blame] | 2204 | if (unlikely(dev_gso_segment(skb, features))) |
David S. Miller | 9ccb897 | 2010-04-22 01:02:07 -0700 | [diff] [blame] | 2205 | goto out_kfree_skb; |
| 2206 | if (skb->next) |
| 2207 | goto gso; |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2208 | } else { |
Jesse Gross | 02932ce | 2011-01-09 06:23:34 +0000 | [diff] [blame] | 2209 | if (skb_needs_linearize(skb, features) && |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2210 | __skb_linearize(skb)) |
| 2211 | goto out_kfree_skb; |
| 2212 | |
| 2213 | /* If packet is not checksummed and device does not |
| 2214 | * support checksumming for this protocol, complete |
| 2215 | * checksumming here. |
| 2216 | */ |
| 2217 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Michał Mirosław | 55508d6 | 2010-12-14 15:24:08 +0000 | [diff] [blame] | 2218 | skb_set_transport_header(skb, |
| 2219 | skb_checksum_start_offset(skb)); |
Jesse Gross | 0363466 | 2011-01-09 06:23:35 +0000 | [diff] [blame] | 2220 | if (!(features & NETIF_F_ALL_CSUM) && |
John Fastabend | 6afff0c | 2010-06-16 14:18:12 +0000 | [diff] [blame] | 2221 | skb_checksum_help(skb)) |
| 2222 | goto out_kfree_skb; |
| 2223 | } |
David S. Miller | 9ccb897 | 2010-04-22 01:02:07 -0700 | [diff] [blame] | 2224 | } |
| 2225 | |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2226 | skb_len = skb->len; |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 2227 | rc = ops->ndo_start_xmit(skb, dev); |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2228 | trace_net_dev_xmit(skb, rc, dev, skb_len); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 2229 | if (rc == NETDEV_TX_OK) |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 2230 | txq_trans_update(txq); |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 2231 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2232 | } |
| 2233 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2234 | gso: |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2235 | do { |
| 2236 | struct sk_buff *nskb = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2237 | |
| 2238 | skb->next = nskb->next; |
| 2239 | nskb->next = NULL; |
Krishna Kumar | 068a2de | 2009-12-09 20:59:58 +0000 | [diff] [blame] | 2240 | |
| 2241 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2242 | * If device doesn't need nskb->dst, release it right now while |
Krishna Kumar | 068a2de | 2009-12-09 20:59:58 +0000 | [diff] [blame] | 2243 | * its hot in this cpu cache |
| 2244 | */ |
| 2245 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 2246 | skb_dst_drop(nskb); |
| 2247 | |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2248 | skb_len = nskb->len; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 2249 | rc = ops->ndo_start_xmit(nskb, dev); |
Koki Sanagi | ec764bf | 2011-05-30 21:48:34 +0000 | [diff] [blame] | 2250 | trace_net_dev_xmit(nskb, rc, dev, skb_len); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 2251 | if (unlikely(rc != NETDEV_TX_OK)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2252 | if (rc & ~NETDEV_TX_MASK) |
| 2253 | goto out_kfree_gso_skb; |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 2254 | nskb->next = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2255 | skb->next = nskb; |
| 2256 | return rc; |
| 2257 | } |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 2258 | txq_trans_update(txq); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2259 | if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 2260 | return NETDEV_TX_BUSY; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2261 | } while (skb->next); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2262 | |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2263 | out_kfree_gso_skb: |
| 2264 | if (likely(skb->next == NULL)) |
| 2265 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2266 | out_kfree_skb: |
| 2267 | kfree_skb(skb); |
Jesse Gross | 7b9c609 | 2010-10-20 13:56:04 +0000 | [diff] [blame] | 2268 | out: |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2269 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2270 | } |
| 2271 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2272 | static u32 hashrnd __read_mostly; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 2273 | |
Vladislav Zolotarov | a3d22a6 | 2010-12-13 06:27:10 +0000 | [diff] [blame] | 2274 | /* |
| 2275 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number |
| 2276 | * to be used as a distribution range. |
| 2277 | */ |
| 2278 | u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb, |
| 2279 | unsigned int num_tx_queues) |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 2280 | { |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 2281 | u32 hash; |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 2282 | u16 qoffset = 0; |
| 2283 | u16 qcount = num_tx_queues; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 2284 | |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 2285 | if (skb_rx_queue_recorded(skb)) { |
| 2286 | hash = skb_get_rx_queue(skb); |
Vladislav Zolotarov | a3d22a6 | 2010-12-13 06:27:10 +0000 | [diff] [blame] | 2287 | while (unlikely(hash >= num_tx_queues)) |
| 2288 | hash -= num_tx_queues; |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 2289 | return hash; |
| 2290 | } |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 2291 | |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 2292 | if (dev->num_tc) { |
| 2293 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); |
| 2294 | qoffset = dev->tc_to_txq[tc].offset; |
| 2295 | qcount = dev->tc_to_txq[tc].count; |
| 2296 | } |
| 2297 | |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 2298 | if (skb->sk && skb->sk->sk_hash) |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 2299 | hash = skb->sk->sk_hash; |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 2300 | else |
Eric Dumazet | 87fd308 | 2010-07-13 05:24:20 +0000 | [diff] [blame] | 2301 | hash = (__force u16) skb->protocol ^ skb->rxhash; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2302 | hash = jhash_1word(hash, hashrnd); |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 2303 | |
John Fastabend | 4f57c08 | 2011-01-17 08:06:04 +0000 | [diff] [blame] | 2304 | return (u16) (((u64) hash * qcount) >> 32) + qoffset; |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 2305 | } |
Vladislav Zolotarov | a3d22a6 | 2010-12-13 06:27:10 +0000 | [diff] [blame] | 2306 | EXPORT_SYMBOL(__skb_tx_hash); |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 2307 | |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 2308 | static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index) |
| 2309 | { |
| 2310 | if (unlikely(queue_index >= dev->real_num_tx_queues)) { |
| 2311 | if (net_ratelimit()) { |
Eric Dumazet | 7a161ea | 2010-04-08 21:26:13 +0000 | [diff] [blame] | 2312 | pr_warning("%s selects TX queue %d, but " |
| 2313 | "real number of TX queues is %d\n", |
| 2314 | dev->name, queue_index, dev->real_num_tx_queues); |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 2315 | } |
| 2316 | return 0; |
| 2317 | } |
| 2318 | return queue_index; |
| 2319 | } |
| 2320 | |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 2321 | static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb) |
| 2322 | { |
Tom Herbert | bf26414 | 2010-11-26 08:36:09 +0000 | [diff] [blame] | 2323 | #ifdef CONFIG_XPS |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 2324 | struct xps_dev_maps *dev_maps; |
| 2325 | struct xps_map *map; |
| 2326 | int queue_index = -1; |
| 2327 | |
| 2328 | rcu_read_lock(); |
| 2329 | dev_maps = rcu_dereference(dev->xps_maps); |
| 2330 | if (dev_maps) { |
| 2331 | map = rcu_dereference( |
| 2332 | dev_maps->cpu_map[raw_smp_processor_id()]); |
| 2333 | if (map) { |
| 2334 | if (map->len == 1) |
| 2335 | queue_index = map->queues[0]; |
| 2336 | else { |
| 2337 | u32 hash; |
| 2338 | if (skb->sk && skb->sk->sk_hash) |
| 2339 | hash = skb->sk->sk_hash; |
| 2340 | else |
| 2341 | hash = (__force u16) skb->protocol ^ |
| 2342 | skb->rxhash; |
| 2343 | hash = jhash_1word(hash, hashrnd); |
| 2344 | queue_index = map->queues[ |
| 2345 | ((u64)hash * map->len) >> 32]; |
| 2346 | } |
| 2347 | if (unlikely(queue_index >= dev->real_num_tx_queues)) |
| 2348 | queue_index = -1; |
| 2349 | } |
| 2350 | } |
| 2351 | rcu_read_unlock(); |
| 2352 | |
| 2353 | return queue_index; |
| 2354 | #else |
| 2355 | return -1; |
| 2356 | #endif |
| 2357 | } |
| 2358 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 2359 | static struct netdev_queue *dev_pick_tx(struct net_device *dev, |
| 2360 | struct sk_buff *skb) |
| 2361 | { |
Tom Herbert | b0f77d0 | 2010-07-14 20:50:29 -0700 | [diff] [blame] | 2362 | int queue_index; |
Helmut Schaa | deabc77 | 2010-09-03 02:39:56 +0000 | [diff] [blame] | 2363 | const struct net_device_ops *ops = dev->netdev_ops; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2364 | |
Tom Herbert | 3853b58 | 2010-11-21 13:17:29 +0000 | [diff] [blame] | 2365 | if (dev->real_num_tx_queues == 1) |
| 2366 | queue_index = 0; |
| 2367 | else if (ops->ndo_select_queue) { |
Helmut Schaa | deabc77 | 2010-09-03 02:39:56 +0000 | [diff] [blame] | 2368 | queue_index = ops->ndo_select_queue(dev, skb); |
| 2369 | queue_index = dev_cap_txqueue(dev, queue_index); |
| 2370 | } else { |
| 2371 | struct sock *sk = skb->sk; |
| 2372 | queue_index = sk_tx_queue_get(sk); |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2373 | |
Tom Herbert | 3853b58 | 2010-11-21 13:17:29 +0000 | [diff] [blame] | 2374 | if (queue_index < 0 || skb->ooo_okay || |
| 2375 | queue_index >= dev->real_num_tx_queues) { |
| 2376 | int old_index = queue_index; |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2377 | |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 2378 | queue_index = get_xps_queue(dev, skb); |
| 2379 | if (queue_index < 0) |
| 2380 | queue_index = skb_tx_hash(dev, skb); |
Tom Herbert | 3853b58 | 2010-11-21 13:17:29 +0000 | [diff] [blame] | 2381 | |
| 2382 | if (queue_index != old_index && sk) { |
| 2383 | struct dst_entry *dst = |
| 2384 | rcu_dereference_check(sk->sk_dst_cache, 1); |
Eric Dumazet | 8728c54 | 2010-04-11 21:18:17 +0000 | [diff] [blame] | 2385 | |
| 2386 | if (dst && skb_dst(skb) == dst) |
| 2387 | sk_tx_queue_set(sk, queue_index); |
| 2388 | } |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2389 | } |
| 2390 | } |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 2391 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2392 | skb_set_queue_mapping(skb, queue_index); |
| 2393 | return netdev_get_tx_queue(dev, queue_index); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 2394 | } |
| 2395 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2396 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
| 2397 | struct net_device *dev, |
| 2398 | struct netdev_queue *txq) |
| 2399 | { |
| 2400 | spinlock_t *root_lock = qdisc_lock(q); |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2401 | bool contended; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2402 | int rc; |
| 2403 | |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2404 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
| 2405 | qdisc_calculate_pkt_len(skb, q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2406 | /* |
| 2407 | * Heuristic to force contended enqueues to serialize on a |
| 2408 | * separate lock before trying to get qdisc main lock. |
| 2409 | * This permits __QDISC_STATE_RUNNING owner to get the lock more often |
| 2410 | * and dequeue packets faster. |
| 2411 | */ |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2412 | contended = qdisc_is_running(q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2413 | if (unlikely(contended)) |
| 2414 | spin_lock(&q->busylock); |
| 2415 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2416 | spin_lock(root_lock); |
| 2417 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { |
| 2418 | kfree_skb(skb); |
| 2419 | rc = NET_XMIT_DROP; |
| 2420 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 2421 | qdisc_run_begin(q)) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2422 | /* |
| 2423 | * This is a work-conserving queue; there are no old skbs |
| 2424 | * waiting to be sent out; and the qdisc is not running - |
| 2425 | * xmit the skb directly. |
| 2426 | */ |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 2427 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE)) |
| 2428 | skb_dst_force(skb); |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 2429 | |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 2430 | qdisc_bstats_update(q, skb); |
| 2431 | |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2432 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) { |
| 2433 | if (unlikely(contended)) { |
| 2434 | spin_unlock(&q->busylock); |
| 2435 | contended = false; |
| 2436 | } |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2437 | __qdisc_run(q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2438 | } else |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 2439 | qdisc_run_end(q); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2440 | |
| 2441 | rc = NET_XMIT_SUCCESS; |
| 2442 | } else { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 2443 | skb_dst_force(skb); |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 2444 | rc = q->enqueue(skb, q) & NET_XMIT_MASK; |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2445 | if (qdisc_run_begin(q)) { |
| 2446 | if (unlikely(contended)) { |
| 2447 | spin_unlock(&q->busylock); |
| 2448 | contended = false; |
| 2449 | } |
| 2450 | __qdisc_run(q); |
| 2451 | } |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2452 | } |
| 2453 | spin_unlock(root_lock); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2454 | if (unlikely(contended)) |
| 2455 | spin_unlock(&q->busylock); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2456 | return rc; |
| 2457 | } |
| 2458 | |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2459 | static DEFINE_PER_CPU(int, xmit_recursion); |
David S. Miller | 11a766c | 2010-10-25 12:51:55 -0700 | [diff] [blame] | 2460 | #define RECURSION_LIMIT 10 |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2461 | |
Dave Jones | d29f749 | 2008-07-22 14:09:06 -0700 | [diff] [blame] | 2462 | /** |
| 2463 | * dev_queue_xmit - transmit a buffer |
| 2464 | * @skb: buffer to transmit |
| 2465 | * |
| 2466 | * Queue a buffer for transmission to a network device. The caller must |
| 2467 | * have set the device and priority and built the buffer before calling |
| 2468 | * this function. The function can be called from an interrupt. |
| 2469 | * |
| 2470 | * A negative errno code is returned on a failure. A success does not |
| 2471 | * guarantee the frame will be transmitted as it may be dropped due |
| 2472 | * to congestion or traffic shaping. |
| 2473 | * |
| 2474 | * ----------------------------------------------------------------------------------- |
| 2475 | * I notice this method can also return errors from the queue disciplines, |
| 2476 | * including NET_XMIT_DROP, which is a positive value. So, errors can also |
| 2477 | * be positive. |
| 2478 | * |
| 2479 | * Regardless of the return value, the skb is consumed, so it is currently |
| 2480 | * difficult to retry a send to this method. (You can bump the ref count |
| 2481 | * before sending to hold a reference for retry if you are careful.) |
| 2482 | * |
| 2483 | * When calling this method, interrupts MUST be enabled. This is because |
| 2484 | * the BH enable code must have IRQs enabled so that it will not deadlock. |
| 2485 | * --BLG |
| 2486 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | int dev_queue_xmit(struct sk_buff *skb) |
| 2488 | { |
| 2489 | struct net_device *dev = skb->dev; |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 2490 | struct netdev_queue *txq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | struct Qdisc *q; |
| 2492 | int rc = -ENOMEM; |
| 2493 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2494 | /* Disable soft irqs for various locks below. Also |
| 2495 | * stops preemption for RCU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2497 | rcu_read_lock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2498 | |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 2499 | txq = dev_pick_tx(dev, skb); |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 2500 | q = rcu_dereference_bh(txq->qdisc); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | #ifdef CONFIG_NET_CLS_ACT |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2503 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | #endif |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 2505 | trace_net_dev_queue(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2506 | if (q->enqueue) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2507 | rc = __dev_xmit_skb(skb, q, dev, txq); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2508 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | } |
| 2510 | |
| 2511 | /* The device has no queue. Common case for software devices: |
| 2512 | loopback, all the sorts of tunnels... |
| 2513 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 2514 | Really, it is unlikely that netif_tx_lock protection is necessary |
| 2515 | here. (f.e. loopback and IP tunnels are clean ignoring statistics |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2516 | counters.) |
| 2517 | However, it is possible, that they rely on protection |
| 2518 | made by us here. |
| 2519 | |
| 2520 | Check this and shot the lock. It is not prone from deadlocks. |
| 2521 | Either shot noqueue qdisc, it is even simpler 8) |
| 2522 | */ |
| 2523 | if (dev->flags & IFF_UP) { |
| 2524 | int cpu = smp_processor_id(); /* ok because BHs are off */ |
| 2525 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2526 | if (txq->xmit_lock_owner != cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2528 | if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) |
| 2529 | goto recursion_alert; |
| 2530 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2531 | HARD_TX_LOCK(dev, txq, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2532 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2533 | if (!netif_tx_queue_stopped(txq)) { |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2534 | __this_cpu_inc(xmit_recursion); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2535 | rc = dev_hard_start_xmit(skb, dev, txq); |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2536 | __this_cpu_dec(xmit_recursion); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2537 | if (dev_xmit_complete(rc)) { |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2538 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | goto out; |
| 2540 | } |
| 2541 | } |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2542 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2543 | if (net_ratelimit()) |
| 2544 | printk(KERN_CRIT "Virtual device %s asks to " |
| 2545 | "queue packet!\n", dev->name); |
| 2546 | } else { |
| 2547 | /* Recursion is detected! It is possible, |
Eric Dumazet | 745e20f | 2010-09-29 13:23:09 -0700 | [diff] [blame] | 2548 | * unfortunately |
| 2549 | */ |
| 2550 | recursion_alert: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | if (net_ratelimit()) |
| 2552 | printk(KERN_CRIT "Dead loop on virtual device " |
| 2553 | "%s, fix it urgently!\n", dev->name); |
| 2554 | } |
| 2555 | } |
| 2556 | |
| 2557 | rc = -ENETDOWN; |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2558 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2560 | kfree_skb(skb); |
| 2561 | return rc; |
| 2562 | out: |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2563 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2564 | return rc; |
| 2565 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2566 | EXPORT_SYMBOL(dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2567 | |
| 2568 | |
| 2569 | /*======================================================================= |
| 2570 | Receiver routines |
| 2571 | =======================================================================*/ |
| 2572 | |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2573 | int netdev_max_backlog __read_mostly = 1000; |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2574 | int netdev_tstamp_prequeue __read_mostly = 1; |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2575 | int netdev_budget __read_mostly = 300; |
| 2576 | int weight_p __read_mostly = 64; /* old backlog weight */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 2578 | /* Called with irq disabled */ |
| 2579 | static inline void ____napi_schedule(struct softnet_data *sd, |
| 2580 | struct napi_struct *napi) |
| 2581 | { |
| 2582 | list_add_tail(&napi->poll_list, &sd->poll_list); |
| 2583 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 2584 | } |
| 2585 | |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2586 | /* |
| 2587 | * __skb_get_rxhash: calculate a flow hash based on src/dst addresses |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 2588 | * and src/dst port numbers. Sets rxhash in skb to non-zero hash value |
| 2589 | * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb |
| 2590 | * if hash is a canonical 4-tuple hash over transport ports. |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2591 | */ |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 2592 | void __skb_get_rxhash(struct sk_buff *skb) |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2593 | { |
Changli Gao | 12fcdef | 2010-08-17 19:04:32 +0000 | [diff] [blame] | 2594 | int nhoff, hash = 0, poff; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 2595 | const struct ipv6hdr *ip6; |
| 2596 | const struct iphdr *ip; |
Changli Gao | 1ff1986 | 2011-08-18 22:07:54 -0700 | [diff] [blame] | 2597 | const struct vlan_hdr *vlan; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2598 | u8 ip_proto; |
Tom Herbert | 792df22 | 2011-08-14 19:45:04 +0000 | [diff] [blame] | 2599 | u32 addr1, addr2; |
| 2600 | u16 proto; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2601 | union { |
| 2602 | u32 v32; |
| 2603 | u16 v16[2]; |
| 2604 | } ports; |
| 2605 | |
| 2606 | nhoff = skb_network_offset(skb); |
Tom Herbert | 792df22 | 2011-08-14 19:45:04 +0000 | [diff] [blame] | 2607 | proto = skb->protocol; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2608 | |
Tom Herbert | e971b722 | 2011-08-14 19:46:12 +0000 | [diff] [blame] | 2609 | again: |
Tom Herbert | 792df22 | 2011-08-14 19:45:04 +0000 | [diff] [blame] | 2610 | switch (proto) { |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2611 | case __constant_htons(ETH_P_IP): |
Changli Gao | 5dd17e0 | 2011-09-20 22:36:07 +0000 | [diff] [blame] | 2612 | ip: |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2613 | if (!pskb_may_pull(skb, sizeof(*ip) + nhoff)) |
| 2614 | goto done; |
| 2615 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 2616 | ip = (const struct iphdr *) (skb->data + nhoff); |
Paul Gortmaker | 56f8a75 | 2011-06-21 20:33:34 -0700 | [diff] [blame] | 2617 | if (ip_is_fragment(ip)) |
Changli Gao | dbe5775 | 2010-08-17 19:01:38 +0000 | [diff] [blame] | 2618 | ip_proto = 0; |
| 2619 | else |
| 2620 | ip_proto = ip->protocol; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2621 | addr1 = (__force u32) ip->saddr; |
| 2622 | addr2 = (__force u32) ip->daddr; |
Tom Herbert | 792df22 | 2011-08-14 19:45:04 +0000 | [diff] [blame] | 2623 | nhoff += ip->ihl * 4; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2624 | break; |
| 2625 | case __constant_htons(ETH_P_IPV6): |
Changli Gao | 5dd17e0 | 2011-09-20 22:36:07 +0000 | [diff] [blame] | 2626 | ipv6: |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2627 | if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff)) |
| 2628 | goto done; |
| 2629 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 2630 | ip6 = (const struct ipv6hdr *) (skb->data + nhoff); |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2631 | ip_proto = ip6->nexthdr; |
| 2632 | addr1 = (__force u32) ip6->saddr.s6_addr32[3]; |
| 2633 | addr2 = (__force u32) ip6->daddr.s6_addr32[3]; |
Tom Herbert | 792df22 | 2011-08-14 19:45:04 +0000 | [diff] [blame] | 2634 | nhoff += 40; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2635 | break; |
Changli Gao | 1ff1986 | 2011-08-18 22:07:54 -0700 | [diff] [blame] | 2636 | case __constant_htons(ETH_P_8021Q): |
| 2637 | if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff)) |
| 2638 | goto done; |
| 2639 | vlan = (const struct vlan_hdr *) (skb->data + nhoff); |
| 2640 | proto = vlan->h_vlan_encapsulated_proto; |
| 2641 | nhoff += sizeof(*vlan); |
| 2642 | goto again; |
Changli Gao | ae1511b | 2011-08-18 23:23:47 -0700 | [diff] [blame] | 2643 | case __constant_htons(ETH_P_PPP_SES): |
| 2644 | if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff)) |
| 2645 | goto done; |
| 2646 | proto = *((__be16 *) (skb->data + nhoff + |
| 2647 | sizeof(struct pppoe_hdr))); |
| 2648 | nhoff += PPPOE_SES_HLEN; |
Changli Gao | 5dd17e0 | 2011-09-20 22:36:07 +0000 | [diff] [blame] | 2649 | switch (proto) { |
| 2650 | case __constant_htons(PPP_IP): |
| 2651 | goto ip; |
| 2652 | case __constant_htons(PPP_IPV6): |
| 2653 | goto ipv6; |
| 2654 | default: |
| 2655 | goto done; |
| 2656 | } |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2657 | default: |
| 2658 | goto done; |
| 2659 | } |
| 2660 | |
Tom Herbert | e971b722 | 2011-08-14 19:46:12 +0000 | [diff] [blame] | 2661 | switch (ip_proto) { |
Tom Herbert | c6865cb | 2011-08-14 19:46:29 +0000 | [diff] [blame] | 2662 | case IPPROTO_GRE: |
| 2663 | if (pskb_may_pull(skb, nhoff + 16)) { |
| 2664 | u8 *h = skb->data + nhoff; |
| 2665 | __be16 flags = *(__be16 *)h; |
| 2666 | |
| 2667 | /* |
| 2668 | * Only look inside GRE if version zero and no |
| 2669 | * routing |
| 2670 | */ |
| 2671 | if (!(flags & (GRE_VERSION|GRE_ROUTING))) { |
| 2672 | proto = *(__be16 *)(h + 2); |
| 2673 | nhoff += 4; |
| 2674 | if (flags & GRE_CSUM) |
| 2675 | nhoff += 4; |
| 2676 | if (flags & GRE_KEY) |
| 2677 | nhoff += 4; |
| 2678 | if (flags & GRE_SEQ) |
| 2679 | nhoff += 4; |
| 2680 | goto again; |
| 2681 | } |
| 2682 | } |
| 2683 | break; |
Eric Dumazet | ec5efe7 | 2011-08-24 10:41:19 +0000 | [diff] [blame] | 2684 | case IPPROTO_IPIP: |
| 2685 | goto again; |
Tom Herbert | e971b722 | 2011-08-14 19:46:12 +0000 | [diff] [blame] | 2686 | default: |
| 2687 | break; |
| 2688 | } |
| 2689 | |
Changli Gao | 12fcdef | 2010-08-17 19:04:32 +0000 | [diff] [blame] | 2690 | ports.v32 = 0; |
| 2691 | poff = proto_ports_offset(ip_proto); |
| 2692 | if (poff >= 0) { |
Tom Herbert | 792df22 | 2011-08-14 19:45:04 +0000 | [diff] [blame] | 2693 | nhoff += poff; |
Changli Gao | 12fcdef | 2010-08-17 19:04:32 +0000 | [diff] [blame] | 2694 | if (pskb_may_pull(skb, nhoff + 4)) { |
| 2695 | ports.v32 = * (__force u32 *) (skb->data + nhoff); |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2696 | if (ports.v16[1] < ports.v16[0]) |
| 2697 | swap(ports.v16[0], ports.v16[1]); |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 2698 | skb->l4_rxhash = 1; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2699 | } |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2700 | } |
| 2701 | |
| 2702 | /* get a consistent hash (same value on both flow directions) */ |
| 2703 | if (addr2 < addr1) |
| 2704 | swap(addr1, addr2); |
| 2705 | |
| 2706 | hash = jhash_3words(addr1, addr2, ports.v32, hashrnd); |
| 2707 | if (!hash) |
| 2708 | hash = 1; |
| 2709 | |
| 2710 | done: |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 2711 | skb->rxhash = hash; |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2712 | } |
| 2713 | EXPORT_SYMBOL(__skb_get_rxhash); |
| 2714 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2715 | #ifdef CONFIG_RPS |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2716 | |
| 2717 | /* One global table that all flow-based protocols share. */ |
Eric Dumazet | 6e3f7fa | 2010-10-25 03:02:02 +0000 | [diff] [blame] | 2718 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2719 | EXPORT_SYMBOL(rps_sock_flow_table); |
| 2720 | |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2721 | static struct rps_dev_flow * |
| 2722 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
| 2723 | struct rps_dev_flow *rflow, u16 next_cpu) |
| 2724 | { |
Ben Hutchings | 09994d1 | 2011-10-03 04:42:46 +0000 | [diff] [blame] | 2725 | if (next_cpu != RPS_NO_CPU) { |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2726 | #ifdef CONFIG_RFS_ACCEL |
| 2727 | struct netdev_rx_queue *rxqueue; |
| 2728 | struct rps_dev_flow_table *flow_table; |
| 2729 | struct rps_dev_flow *old_rflow; |
| 2730 | u32 flow_id; |
| 2731 | u16 rxq_index; |
| 2732 | int rc; |
| 2733 | |
| 2734 | /* Should we steer this flow to a different hardware queue? */ |
Ben Hutchings | 69a19ee | 2011-02-15 20:32:04 +0000 | [diff] [blame] | 2735 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
| 2736 | !(dev->features & NETIF_F_NTUPLE)) |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2737 | goto out; |
| 2738 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); |
| 2739 | if (rxq_index == skb_get_rx_queue(skb)) |
| 2740 | goto out; |
| 2741 | |
| 2742 | rxqueue = dev->_rx + rxq_index; |
| 2743 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 2744 | if (!flow_table) |
| 2745 | goto out; |
| 2746 | flow_id = skb->rxhash & flow_table->mask; |
| 2747 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
| 2748 | rxq_index, flow_id); |
| 2749 | if (rc < 0) |
| 2750 | goto out; |
| 2751 | old_rflow = rflow; |
| 2752 | rflow = &flow_table->flows[flow_id]; |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2753 | rflow->filter = rc; |
| 2754 | if (old_rflow->filter == rflow->filter) |
| 2755 | old_rflow->filter = RPS_NO_FILTER; |
| 2756 | out: |
| 2757 | #endif |
| 2758 | rflow->last_qtail = |
Ben Hutchings | 09994d1 | 2011-10-03 04:42:46 +0000 | [diff] [blame] | 2759 | per_cpu(softnet_data, next_cpu).input_queue_head; |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2760 | } |
| 2761 | |
Ben Hutchings | 09994d1 | 2011-10-03 04:42:46 +0000 | [diff] [blame] | 2762 | rflow->cpu = next_cpu; |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2763 | return rflow; |
| 2764 | } |
| 2765 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2766 | /* |
| 2767 | * get_rps_cpu is called from netif_receive_skb and returns the target |
| 2768 | * 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] | 2769 | * rcu_read_lock must be held on entry. |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2770 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2771 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
| 2772 | struct rps_dev_flow **rflowp) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2773 | { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2774 | struct netdev_rx_queue *rxqueue; |
Eric Dumazet | 6e3f7fa | 2010-10-25 03:02:02 +0000 | [diff] [blame] | 2775 | struct rps_map *map; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2776 | struct rps_dev_flow_table *flow_table; |
| 2777 | struct rps_sock_flow_table *sock_flow_table; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2778 | int cpu = -1; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2779 | u16 tcpu; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2780 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2781 | if (skb_rx_queue_recorded(skb)) { |
| 2782 | u16 index = skb_get_rx_queue(skb); |
Ben Hutchings | 62fe0b4 | 2010-09-27 08:24:33 +0000 | [diff] [blame] | 2783 | if (unlikely(index >= dev->real_num_rx_queues)) { |
| 2784 | WARN_ONCE(dev->real_num_rx_queues > 1, |
| 2785 | "%s received packet on queue %u, but number " |
| 2786 | "of RX queues is %u\n", |
| 2787 | dev->name, index, dev->real_num_rx_queues); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2788 | goto done; |
| 2789 | } |
| 2790 | rxqueue = dev->_rx + index; |
| 2791 | } else |
| 2792 | rxqueue = dev->_rx; |
| 2793 | |
Eric Dumazet | 6e3f7fa | 2010-10-25 03:02:02 +0000 | [diff] [blame] | 2794 | map = rcu_dereference(rxqueue->rps_map); |
| 2795 | if (map) { |
Tom Herbert | 8587523 | 2011-01-31 16:23:42 -0800 | [diff] [blame] | 2796 | if (map->len == 1 && |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 2797 | !rcu_access_pointer(rxqueue->rps_flow_table)) { |
Changli Gao | 6febfca | 2010-09-03 23:12:37 +0000 | [diff] [blame] | 2798 | tcpu = map->cpus[0]; |
| 2799 | if (cpu_online(tcpu)) |
| 2800 | cpu = tcpu; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2801 | goto done; |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 2802 | } |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 2803 | } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2804 | goto done; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2805 | } |
| 2806 | |
Changli Gao | 2d47b45 | 2010-08-17 19:00:56 +0000 | [diff] [blame] | 2807 | skb_reset_network_header(skb); |
Krishna Kumar | bfb564e | 2010-08-04 06:15:52 +0000 | [diff] [blame] | 2808 | if (!skb_get_rxhash(skb)) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2809 | goto done; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2810 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2811 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 2812 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
| 2813 | if (flow_table && sock_flow_table) { |
| 2814 | u16 next_cpu; |
| 2815 | struct rps_dev_flow *rflow; |
| 2816 | |
| 2817 | rflow = &flow_table->flows[skb->rxhash & flow_table->mask]; |
| 2818 | tcpu = rflow->cpu; |
| 2819 | |
| 2820 | next_cpu = sock_flow_table->ents[skb->rxhash & |
| 2821 | sock_flow_table->mask]; |
| 2822 | |
| 2823 | /* |
| 2824 | * If the desired CPU (where last recvmsg was done) is |
| 2825 | * different from current CPU (one in the rx-queue flow |
| 2826 | * table entry), switch if one of the following holds: |
| 2827 | * - Current CPU is unset (equal to RPS_NO_CPU). |
| 2828 | * - Current CPU is offline. |
| 2829 | * - The current CPU's queue tail has advanced beyond the |
| 2830 | * last packet that was enqueued using this table entry. |
| 2831 | * This guarantees that all previous packets for the flow |
| 2832 | * have been dequeued, thus preserving in order delivery. |
| 2833 | */ |
| 2834 | if (unlikely(tcpu != next_cpu) && |
| 2835 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || |
| 2836 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2837 | rflow->last_qtail)) >= 0)) |
| 2838 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
| 2839 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2840 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
| 2841 | *rflowp = rflow; |
| 2842 | cpu = tcpu; |
| 2843 | goto done; |
| 2844 | } |
| 2845 | } |
| 2846 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2847 | if (map) { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2848 | tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32]; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2849 | |
| 2850 | if (cpu_online(tcpu)) { |
| 2851 | cpu = tcpu; |
| 2852 | goto done; |
| 2853 | } |
| 2854 | } |
| 2855 | |
| 2856 | done: |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2857 | return cpu; |
| 2858 | } |
| 2859 | |
Ben Hutchings | c445477 | 2011-01-19 11:03:53 +0000 | [diff] [blame] | 2860 | #ifdef CONFIG_RFS_ACCEL |
| 2861 | |
| 2862 | /** |
| 2863 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed |
| 2864 | * @dev: Device on which the filter was set |
| 2865 | * @rxq_index: RX queue index |
| 2866 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() |
| 2867 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() |
| 2868 | * |
| 2869 | * Drivers that implement ndo_rx_flow_steer() should periodically call |
| 2870 | * this function for each installed filter and remove the filters for |
| 2871 | * which it returns %true. |
| 2872 | */ |
| 2873 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, |
| 2874 | u32 flow_id, u16 filter_id) |
| 2875 | { |
| 2876 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; |
| 2877 | struct rps_dev_flow_table *flow_table; |
| 2878 | struct rps_dev_flow *rflow; |
| 2879 | bool expire = true; |
| 2880 | int cpu; |
| 2881 | |
| 2882 | rcu_read_lock(); |
| 2883 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 2884 | if (flow_table && flow_id <= flow_table->mask) { |
| 2885 | rflow = &flow_table->flows[flow_id]; |
| 2886 | cpu = ACCESS_ONCE(rflow->cpu); |
| 2887 | if (rflow->filter == filter_id && cpu != RPS_NO_CPU && |
| 2888 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
| 2889 | rflow->last_qtail) < |
| 2890 | (int)(10 * flow_table->mask))) |
| 2891 | expire = false; |
| 2892 | } |
| 2893 | rcu_read_unlock(); |
| 2894 | return expire; |
| 2895 | } |
| 2896 | EXPORT_SYMBOL(rps_may_expire_flow); |
| 2897 | |
| 2898 | #endif /* CONFIG_RFS_ACCEL */ |
| 2899 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2900 | /* Called from hardirq (IPI) context */ |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2901 | static void rps_trigger_softirq(void *data) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2902 | { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2903 | struct softnet_data *sd = data; |
| 2904 | |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 2905 | ____napi_schedule(sd, &sd->backlog); |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 2906 | sd->received_rps++; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2907 | } |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2908 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2909 | #endif /* CONFIG_RPS */ |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2910 | |
| 2911 | /* |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2912 | * Check if this softnet_data structure is another cpu one |
| 2913 | * If yes, queue it to our IPI list and return 1 |
| 2914 | * If no, return 0 |
| 2915 | */ |
| 2916 | static int rps_ipi_queued(struct softnet_data *sd) |
| 2917 | { |
| 2918 | #ifdef CONFIG_RPS |
| 2919 | struct softnet_data *mysd = &__get_cpu_var(softnet_data); |
| 2920 | |
| 2921 | if (sd != mysd) { |
| 2922 | sd->rps_ipi_next = mysd->rps_ipi_list; |
| 2923 | mysd->rps_ipi_list = sd; |
| 2924 | |
| 2925 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 2926 | return 1; |
| 2927 | } |
| 2928 | #endif /* CONFIG_RPS */ |
| 2929 | return 0; |
| 2930 | } |
| 2931 | |
| 2932 | /* |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2933 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog |
| 2934 | * queue (may be a remote CPU queue). |
| 2935 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2936 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
| 2937 | unsigned int *qtail) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2938 | { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2939 | struct softnet_data *sd; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2940 | unsigned long flags; |
| 2941 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2942 | sd = &per_cpu(softnet_data, cpu); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2943 | |
| 2944 | local_irq_save(flags); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2945 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2946 | rps_lock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 2947 | if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) { |
| 2948 | if (skb_queue_len(&sd->input_pkt_queue)) { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2949 | enqueue: |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2950 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 2951 | input_queue_tail_incr_save(sd, qtail); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2952 | rps_unlock(sd); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2953 | local_irq_restore(flags); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2954 | return NET_RX_SUCCESS; |
| 2955 | } |
| 2956 | |
Eric Dumazet | ebda37c | 2010-05-06 23:51:21 +0000 | [diff] [blame] | 2957 | /* Schedule NAPI for backlog device |
| 2958 | * We can use non atomic operation since we own the queue lock |
| 2959 | */ |
| 2960 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2961 | if (!rps_ipi_queued(sd)) |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 2962 | ____napi_schedule(sd, &sd->backlog); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2963 | } |
| 2964 | goto enqueue; |
| 2965 | } |
| 2966 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 2967 | sd->dropped++; |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2968 | rps_unlock(sd); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2969 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2970 | local_irq_restore(flags); |
| 2971 | |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 2972 | atomic_long_inc(&skb->dev->rx_dropped); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2973 | kfree_skb(skb); |
| 2974 | return NET_RX_DROP; |
| 2975 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2977 | /** |
| 2978 | * netif_rx - post buffer to the network code |
| 2979 | * @skb: buffer to post |
| 2980 | * |
| 2981 | * This function receives a packet from a device driver and queues it for |
| 2982 | * the upper (protocol) levels to process. It always succeeds. The buffer |
| 2983 | * may be dropped during processing for congestion control or by the |
| 2984 | * protocol layers. |
| 2985 | * |
| 2986 | * return values: |
| 2987 | * NET_RX_SUCCESS (no congestion) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2988 | * NET_RX_DROP (packet was dropped) |
| 2989 | * |
| 2990 | */ |
| 2991 | |
| 2992 | int netif_rx(struct sk_buff *skb) |
| 2993 | { |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2994 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2995 | |
| 2996 | /* if netpoll wants it, pretend we never saw it */ |
| 2997 | if (netpoll_rx(skb)) |
| 2998 | return NET_RX_DROP; |
| 2999 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3000 | if (netdev_tstamp_prequeue) |
| 3001 | net_timestamp_check(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3002 | |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 3003 | trace_netif_rx(skb); |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 3004 | #ifdef CONFIG_RPS |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3005 | { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3006 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3007 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | |
Changli Gao | cece194 | 2010-08-07 20:35:43 -0700 | [diff] [blame] | 3009 | preempt_disable(); |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3010 | rcu_read_lock(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3011 | |
| 3012 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3013 | if (cpu < 0) |
| 3014 | cpu = smp_processor_id(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3015 | |
| 3016 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 3017 | |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3018 | rcu_read_unlock(); |
Changli Gao | cece194 | 2010-08-07 20:35:43 -0700 | [diff] [blame] | 3019 | preempt_enable(); |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3020 | } |
| 3021 | #else |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3022 | { |
| 3023 | unsigned int qtail; |
| 3024 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
| 3025 | put_cpu(); |
| 3026 | } |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 3027 | #endif |
| 3028 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3030 | EXPORT_SYMBOL(netif_rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3031 | |
| 3032 | int netif_rx_ni(struct sk_buff *skb) |
| 3033 | { |
| 3034 | int err; |
| 3035 | |
| 3036 | preempt_disable(); |
| 3037 | err = netif_rx(skb); |
| 3038 | if (local_softirq_pending()) |
| 3039 | do_softirq(); |
| 3040 | preempt_enable(); |
| 3041 | |
| 3042 | return err; |
| 3043 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3044 | EXPORT_SYMBOL(netif_rx_ni); |
| 3045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | static void net_tx_action(struct softirq_action *h) |
| 3047 | { |
| 3048 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
| 3049 | |
| 3050 | if (sd->completion_queue) { |
| 3051 | struct sk_buff *clist; |
| 3052 | |
| 3053 | local_irq_disable(); |
| 3054 | clist = sd->completion_queue; |
| 3055 | sd->completion_queue = NULL; |
| 3056 | local_irq_enable(); |
| 3057 | |
| 3058 | while (clist) { |
| 3059 | struct sk_buff *skb = clist; |
| 3060 | clist = clist->next; |
| 3061 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 3062 | WARN_ON(atomic_read(&skb->users)); |
Koki Sanagi | 07dc22e | 2010-08-23 18:46:12 +0900 | [diff] [blame] | 3063 | trace_kfree_skb(skb, net_tx_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3064 | __kfree_skb(skb); |
| 3065 | } |
| 3066 | } |
| 3067 | |
| 3068 | if (sd->output_queue) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3069 | struct Qdisc *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3070 | |
| 3071 | local_irq_disable(); |
| 3072 | head = sd->output_queue; |
| 3073 | sd->output_queue = NULL; |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 3074 | sd->output_queue_tailp = &sd->output_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3075 | local_irq_enable(); |
| 3076 | |
| 3077 | while (head) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3078 | struct Qdisc *q = head; |
| 3079 | spinlock_t *root_lock; |
| 3080 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3081 | head = head->next_sched; |
| 3082 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 3083 | root_lock = qdisc_lock(q); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3084 | if (spin_trylock(root_lock)) { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 3085 | smp_mb__before_clear_bit(); |
| 3086 | clear_bit(__QDISC_STATE_SCHED, |
| 3087 | &q->state); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 3088 | qdisc_run(q); |
| 3089 | spin_unlock(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3090 | } else { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 3091 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 3092 | &q->state)) { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 3093 | __netif_reschedule(q); |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 3094 | } else { |
| 3095 | smp_mb__before_clear_bit(); |
| 3096 | clear_bit(__QDISC_STATE_SCHED, |
| 3097 | &q->state); |
| 3098 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3099 | } |
| 3100 | } |
| 3101 | } |
| 3102 | } |
| 3103 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3104 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
| 3105 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 3106 | /* This hook is defined here for ATM LANE */ |
| 3107 | int (*br_fdb_test_addr_hook)(struct net_device *dev, |
| 3108 | unsigned char *addr) __read_mostly; |
Stephen Hemminger | 4fb019a | 2009-09-11 11:50:08 -0700 | [diff] [blame] | 3109 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 3110 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3112 | #ifdef CONFIG_NET_CLS_ACT |
| 3113 | /* TODO: Maybe we should just force sch_ingress to be compiled in |
| 3114 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions |
| 3115 | * a compare and 2 stores extra right now if we dont have it on |
| 3116 | * but have CONFIG_NET_CLS_ACT |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3117 | * NOTE: This doesn't stop any functionality; if you dont have |
| 3118 | * the ingress scheduler, you just can't add policies on ingress. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3119 | * |
| 3120 | */ |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 3121 | static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3122 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3123 | struct net_device *dev = skb->dev; |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3124 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 3125 | int result = TC_ACT_OK; |
| 3126 | struct Qdisc *q; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3127 | |
Stephen Hemminger | de38483 | 2010-08-01 00:33:23 -0700 | [diff] [blame] | 3128 | if (unlikely(MAX_RED_LOOP < ttl++)) { |
| 3129 | if (net_ratelimit()) |
| 3130 | pr_warning( "Redir loop detected Dropping packet (%d->%d)\n", |
| 3131 | skb->skb_iif, dev->ifindex); |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3132 | return TC_ACT_SHOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3133 | } |
| 3134 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3135 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
| 3136 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); |
| 3137 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 3138 | q = rxq->qdisc; |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 3139 | if (q != &noop_qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 3140 | spin_lock(qdisc_lock(q)); |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 3141 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
| 3142 | result = qdisc_enqueue_root(skb, q); |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 3143 | spin_unlock(qdisc_lock(q)); |
| 3144 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3146 | return result; |
| 3147 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3148 | |
| 3149 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
| 3150 | struct packet_type **pt_prev, |
| 3151 | int *ret, struct net_device *orig_dev) |
| 3152 | { |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 3153 | struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue); |
| 3154 | |
| 3155 | if (!rxq || rxq->qdisc == &noop_qdisc) |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3156 | goto out; |
| 3157 | |
| 3158 | if (*pt_prev) { |
| 3159 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
| 3160 | *pt_prev = NULL; |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3161 | } |
| 3162 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 3163 | switch (ing_filter(skb, rxq)) { |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3164 | case TC_ACT_SHOT: |
| 3165 | case TC_ACT_STOLEN: |
| 3166 | kfree_skb(skb); |
| 3167 | return NULL; |
| 3168 | } |
| 3169 | |
| 3170 | out: |
| 3171 | skb->tc_verd = 0; |
| 3172 | return skb; |
| 3173 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3174 | #endif |
| 3175 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3176 | /** |
| 3177 | * netdev_rx_handler_register - register receive handler |
| 3178 | * @dev: device to register a handler for |
| 3179 | * @rx_handler: receive handler to register |
Jiri Pirko | 93e2c32 | 2010-06-10 03:34:59 +0000 | [diff] [blame] | 3180 | * @rx_handler_data: data pointer that is used by rx handler |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3181 | * |
| 3182 | * Register a receive hander for a device. This handler will then be |
| 3183 | * called from __netif_receive_skb. A negative errno code is returned |
| 3184 | * on a failure. |
| 3185 | * |
| 3186 | * The caller must hold the rtnl_mutex. |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3187 | * |
| 3188 | * For a general description of rx_handler, see enum rx_handler_result. |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3189 | */ |
| 3190 | int netdev_rx_handler_register(struct net_device *dev, |
Jiri Pirko | 93e2c32 | 2010-06-10 03:34:59 +0000 | [diff] [blame] | 3191 | rx_handler_func_t *rx_handler, |
| 3192 | void *rx_handler_data) |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3193 | { |
| 3194 | ASSERT_RTNL(); |
| 3195 | |
| 3196 | if (dev->rx_handler) |
| 3197 | return -EBUSY; |
| 3198 | |
Jiri Pirko | 93e2c32 | 2010-06-10 03:34:59 +0000 | [diff] [blame] | 3199 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3200 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
| 3201 | |
| 3202 | return 0; |
| 3203 | } |
| 3204 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); |
| 3205 | |
| 3206 | /** |
| 3207 | * netdev_rx_handler_unregister - unregister receive handler |
| 3208 | * @dev: device to unregister a handler from |
| 3209 | * |
| 3210 | * Unregister a receive hander from a device. |
| 3211 | * |
| 3212 | * The caller must hold the rtnl_mutex. |
| 3213 | */ |
| 3214 | void netdev_rx_handler_unregister(struct net_device *dev) |
| 3215 | { |
| 3216 | |
| 3217 | ASSERT_RTNL(); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 3218 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
| 3219 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3220 | } |
| 3221 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); |
| 3222 | |
Eric Dumazet | 10f744d | 2010-03-28 23:07:20 -0700 | [diff] [blame] | 3223 | static int __netif_receive_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3224 | { |
| 3225 | struct packet_type *ptype, *pt_prev; |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3226 | rx_handler_func_t *rx_handler; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 3227 | struct net_device *orig_dev; |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3228 | struct net_device *null_or_dev; |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3229 | bool deliver_exact = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3230 | int ret = NET_RX_DROP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 3231 | __be16 type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3232 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3233 | if (!netdev_tstamp_prequeue) |
| 3234 | net_timestamp_check(skb); |
Eric Dumazet | 81bbb3d | 2009-09-30 16:42:42 -0700 | [diff] [blame] | 3235 | |
Koki Sanagi | cf66ba5 | 2010-08-23 18:45:02 +0900 | [diff] [blame] | 3236 | trace_netif_receive_skb(skb); |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 3237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3238 | /* if we've gotten here through NAPI, check netpoll */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3239 | if (netpoll_receive_skb(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3240 | return NET_RX_DROP; |
| 3241 | |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 3242 | if (!skb->skb_iif) |
| 3243 | skb->skb_iif = skb->dev->ifindex; |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 3244 | orig_dev = skb->dev; |
Jiri Pirko | 1765a57 | 2011-02-12 06:48:36 +0000 | [diff] [blame] | 3245 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 3246 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 3247 | skb_reset_transport_header(skb); |
Jiri Pirko | 0b5c9db | 2011-06-10 06:56:58 +0000 | [diff] [blame] | 3248 | skb_reset_mac_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3249 | |
| 3250 | pt_prev = NULL; |
| 3251 | |
| 3252 | rcu_read_lock(); |
| 3253 | |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3254 | another_round: |
| 3255 | |
| 3256 | __this_cpu_inc(softnet_data.processed); |
| 3257 | |
Jiri Pirko | bcc6d47 | 2011-04-07 19:48:33 +0000 | [diff] [blame] | 3258 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) { |
| 3259 | skb = vlan_untag(skb); |
| 3260 | if (unlikely(!skb)) |
| 3261 | goto out; |
| 3262 | } |
| 3263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3264 | #ifdef CONFIG_NET_CLS_ACT |
| 3265 | if (skb->tc_verd & TC_NCLS) { |
| 3266 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); |
| 3267 | goto ncls; |
| 3268 | } |
| 3269 | #endif |
| 3270 | |
| 3271 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3272 | if (!ptype->dev || ptype->dev == skb->dev) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3273 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 3274 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3275 | pt_prev = ptype; |
| 3276 | } |
| 3277 | } |
| 3278 | |
| 3279 | #ifdef CONFIG_NET_CLS_ACT |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 3280 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
| 3281 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3282 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3283 | ncls: |
| 3284 | #endif |
| 3285 | |
Eric Dumazet | 6a32e4f | 2011-10-29 06:13:39 +0000 | [diff] [blame] | 3286 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
John Fastabend | 2425717 | 2011-10-10 09:16:41 +0000 | [diff] [blame] | 3287 | if (vlan_tx_tag_present(skb)) { |
| 3288 | if (pt_prev) { |
| 3289 | ret = deliver_skb(skb, pt_prev, orig_dev); |
| 3290 | pt_prev = NULL; |
| 3291 | } |
Eric Dumazet | 6a32e4f | 2011-10-29 06:13:39 +0000 | [diff] [blame] | 3292 | if (vlan_do_receive(&skb, !rx_handler)) |
John Fastabend | 2425717 | 2011-10-10 09:16:41 +0000 | [diff] [blame] | 3293 | goto another_round; |
| 3294 | else if (unlikely(!skb)) |
| 3295 | goto out; |
| 3296 | } |
| 3297 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3298 | if (rx_handler) { |
| 3299 | if (pt_prev) { |
| 3300 | ret = deliver_skb(skb, pt_prev, orig_dev); |
| 3301 | pt_prev = NULL; |
| 3302 | } |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3303 | switch (rx_handler(&skb)) { |
| 3304 | case RX_HANDLER_CONSUMED: |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3305 | goto out; |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3306 | case RX_HANDLER_ANOTHER: |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3307 | goto another_round; |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3308 | case RX_HANDLER_EXACT: |
| 3309 | deliver_exact = true; |
| 3310 | case RX_HANDLER_PASS: |
| 3311 | break; |
| 3312 | default: |
| 3313 | BUG(); |
| 3314 | } |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 3315 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3316 | |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3317 | /* deliver only exact match when indicated */ |
Jiri Pirko | 8a4eb57 | 2011-03-12 03:14:39 +0000 | [diff] [blame] | 3318 | null_or_dev = deliver_exact ? skb->dev : NULL; |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 3319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3320 | type = skb->protocol; |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3321 | list_for_each_entry_rcu(ptype, |
| 3322 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
David S. Miller | 63d8ea7 | 2011-02-28 10:48:59 -0800 | [diff] [blame] | 3323 | if (ptype->type == type && |
Jiri Pirko | e3f48d3 | 2011-02-28 20:26:31 +0000 | [diff] [blame] | 3324 | (ptype->dev == null_or_dev || ptype->dev == skb->dev || |
| 3325 | ptype->dev == orig_dev)) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3326 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 3327 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3328 | pt_prev = ptype; |
| 3329 | } |
| 3330 | } |
| 3331 | |
| 3332 | if (pt_prev) { |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 3333 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3334 | } else { |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 3335 | atomic_long_inc(&skb->dev->rx_dropped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3336 | kfree_skb(skb); |
| 3337 | /* Jamal, now you will not able to escape explaining |
| 3338 | * me how you were going to use this. :-) |
| 3339 | */ |
| 3340 | ret = NET_RX_DROP; |
| 3341 | } |
| 3342 | |
| 3343 | out: |
| 3344 | rcu_read_unlock(); |
| 3345 | return ret; |
| 3346 | } |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3347 | |
| 3348 | /** |
| 3349 | * netif_receive_skb - process receive buffer from network |
| 3350 | * @skb: buffer to process |
| 3351 | * |
| 3352 | * netif_receive_skb() is the main receive data processing function. |
| 3353 | * It always succeeds. The buffer may be dropped during processing |
| 3354 | * for congestion control or by the protocol layers. |
| 3355 | * |
| 3356 | * This function may only be called from softirq context and interrupts |
| 3357 | * should be enabled. |
| 3358 | * |
| 3359 | * Return values (usually ignored): |
| 3360 | * NET_RX_SUCCESS: no congestion |
| 3361 | * NET_RX_DROP: packet was dropped |
| 3362 | */ |
| 3363 | int netif_receive_skb(struct sk_buff *skb) |
| 3364 | { |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3365 | if (netdev_tstamp_prequeue) |
| 3366 | net_timestamp_check(skb); |
| 3367 | |
Richard Cochran | c1f19b5 | 2010-07-17 08:49:36 +0000 | [diff] [blame] | 3368 | if (skb_defer_rx_timestamp(skb)) |
| 3369 | return NET_RX_SUCCESS; |
| 3370 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 3371 | #ifdef CONFIG_RPS |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3372 | { |
| 3373 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
| 3374 | int cpu, ret; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3375 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3376 | rcu_read_lock(); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3377 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3378 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3379 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 3380 | if (cpu >= 0) { |
| 3381 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 3382 | rcu_read_unlock(); |
| 3383 | } else { |
| 3384 | rcu_read_unlock(); |
| 3385 | ret = __netif_receive_skb(skb); |
| 3386 | } |
| 3387 | |
| 3388 | return ret; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 3389 | } |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 3390 | #else |
| 3391 | return __netif_receive_skb(skb); |
| 3392 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3393 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3394 | EXPORT_SYMBOL(netif_receive_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3395 | |
Eric Dumazet | 8875127 | 2010-04-19 05:07:33 +0000 | [diff] [blame] | 3396 | /* Network device is going away, flush any packets still pending |
| 3397 | * Called with irqs disabled. |
| 3398 | */ |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 3399 | static void flush_backlog(void *arg) |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3400 | { |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 3401 | struct net_device *dev = arg; |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3402 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3403 | struct sk_buff *skb, *tmp; |
| 3404 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3405 | rps_lock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3406 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3407 | if (skb->dev == dev) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3408 | __skb_unlink(skb, &sd->input_pkt_queue); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3409 | kfree_skb(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3410 | input_queue_head_incr(sd); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3411 | } |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3412 | } |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 3413 | rps_unlock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3414 | |
| 3415 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { |
| 3416 | if (skb->dev == dev) { |
| 3417 | __skb_unlink(skb, &sd->process_queue); |
| 3418 | kfree_skb(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3419 | input_queue_head_incr(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3420 | } |
| 3421 | } |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 3422 | } |
| 3423 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3424 | static int napi_gro_complete(struct sk_buff *skb) |
| 3425 | { |
| 3426 | struct packet_type *ptype; |
| 3427 | __be16 type = skb->protocol; |
| 3428 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
| 3429 | int err = -ENOENT; |
| 3430 | |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 3431 | if (NAPI_GRO_CB(skb)->count == 1) { |
| 3432 | skb_shinfo(skb)->gso_size = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3433 | goto out; |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 3434 | } |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3435 | |
| 3436 | rcu_read_lock(); |
| 3437 | list_for_each_entry_rcu(ptype, head, list) { |
| 3438 | if (ptype->type != type || ptype->dev || !ptype->gro_complete) |
| 3439 | continue; |
| 3440 | |
| 3441 | err = ptype->gro_complete(skb); |
| 3442 | break; |
| 3443 | } |
| 3444 | rcu_read_unlock(); |
| 3445 | |
| 3446 | if (err) { |
| 3447 | WARN_ON(&ptype->list == head); |
| 3448 | kfree_skb(skb); |
| 3449 | return NET_RX_SUCCESS; |
| 3450 | } |
| 3451 | |
| 3452 | out: |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3453 | return netif_receive_skb(skb); |
| 3454 | } |
| 3455 | |
Eric Dumazet | 86cac58 | 2010-08-31 18:25:32 +0000 | [diff] [blame] | 3456 | inline void napi_gro_flush(struct napi_struct *napi) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3457 | { |
| 3458 | struct sk_buff *skb, *next; |
| 3459 | |
| 3460 | for (skb = napi->gro_list; skb; skb = next) { |
| 3461 | next = skb->next; |
| 3462 | skb->next = NULL; |
| 3463 | napi_gro_complete(skb); |
| 3464 | } |
| 3465 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3466 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3467 | napi->gro_list = NULL; |
| 3468 | } |
Eric Dumazet | 86cac58 | 2010-08-31 18:25:32 +0000 | [diff] [blame] | 3469 | EXPORT_SYMBOL(napi_gro_flush); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3470 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3471 | 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] | 3472 | { |
| 3473 | struct sk_buff **pp = NULL; |
| 3474 | struct packet_type *ptype; |
| 3475 | __be16 type = skb->protocol; |
| 3476 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
Herbert Xu | 0da2afd | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3477 | int same_flow; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3478 | int mac_len; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3479 | enum gro_result ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3480 | |
Jarek Poplawski | ce9e76c | 2010-08-05 01:19:11 +0000 | [diff] [blame] | 3481 | if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb)) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3482 | goto normal; |
| 3483 | |
David S. Miller | 21dc330 | 2010-08-23 00:13:46 -0700 | [diff] [blame] | 3484 | if (skb_is_gso(skb) || skb_has_frag_list(skb)) |
Herbert Xu | f17f5c9 | 2009-01-14 14:36:12 -0800 | [diff] [blame] | 3485 | goto normal; |
| 3486 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3487 | rcu_read_lock(); |
| 3488 | list_for_each_entry_rcu(ptype, head, list) { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3489 | if (ptype->type != type || ptype->dev || !ptype->gro_receive) |
| 3490 | continue; |
| 3491 | |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3492 | skb_set_network_header(skb, skb_gro_offset(skb)); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3493 | mac_len = skb->network_header - skb->mac_header; |
| 3494 | skb->mac_len = mac_len; |
| 3495 | NAPI_GRO_CB(skb)->same_flow = 0; |
| 3496 | NAPI_GRO_CB(skb)->flush = 0; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3497 | NAPI_GRO_CB(skb)->free = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3498 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3499 | pp = ptype->gro_receive(&napi->gro_list, skb); |
| 3500 | break; |
| 3501 | } |
| 3502 | rcu_read_unlock(); |
| 3503 | |
| 3504 | if (&ptype->list == head) |
| 3505 | goto normal; |
| 3506 | |
Herbert Xu | 0da2afd | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3507 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3508 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
Herbert Xu | 0da2afd | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3509 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3510 | if (pp) { |
| 3511 | struct sk_buff *nskb = *pp; |
| 3512 | |
| 3513 | *pp = nskb->next; |
| 3514 | nskb->next = NULL; |
| 3515 | napi_gro_complete(nskb); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3516 | napi->gro_count--; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3517 | } |
| 3518 | |
Herbert Xu | 0da2afd | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3519 | if (same_flow) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3520 | goto ok; |
| 3521 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3522 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3523 | goto normal; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3524 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3525 | napi->gro_count++; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3526 | NAPI_GRO_CB(skb)->count = 1; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3527 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3528 | skb->next = napi->gro_list; |
| 3529 | napi->gro_list = skb; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3530 | ret = GRO_HELD; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3531 | |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3532 | pull: |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3533 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
| 3534 | int grow = skb_gro_offset(skb) - skb_headlen(skb); |
| 3535 | |
| 3536 | BUG_ON(skb->end - skb->tail < grow); |
| 3537 | |
| 3538 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); |
| 3539 | |
| 3540 | skb->tail += grow; |
| 3541 | skb->data_len -= grow; |
| 3542 | |
| 3543 | skb_shinfo(skb)->frags[0].page_offset += grow; |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 3544 | skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow); |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3545 | |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 3546 | if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) { |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 3547 | skb_frag_unref(skb, 0); |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3548 | memmove(skb_shinfo(skb)->frags, |
| 3549 | skb_shinfo(skb)->frags + 1, |
Jarek Poplawski | e5093ae | 2010-08-11 02:02:10 +0000 | [diff] [blame] | 3550 | --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t)); |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3551 | } |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3552 | } |
| 3553 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3554 | ok: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3555 | return ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3556 | |
| 3557 | normal: |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3558 | ret = GRO_NORMAL; |
| 3559 | goto pull; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3560 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3561 | EXPORT_SYMBOL(dev_gro_receive); |
| 3562 | |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 3563 | static inline gro_result_t |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3564 | __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3565 | { |
| 3566 | struct sk_buff *p; |
| 3567 | |
| 3568 | for (p = napi->gro_list; p; p = p->next) { |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 3569 | unsigned long diffs; |
| 3570 | |
| 3571 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
Jesse Gross | 3701e51 | 2010-10-20 13:56:06 +0000 | [diff] [blame] | 3572 | diffs |= p->vlan_tci ^ skb->vlan_tci; |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 3573 | diffs |= compare_ether_header(skb_mac_header(p), |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 3574 | skb_gro_mac_header(skb)); |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 3575 | NAPI_GRO_CB(p)->same_flow = !diffs; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3576 | NAPI_GRO_CB(p)->flush = 0; |
| 3577 | } |
| 3578 | |
| 3579 | return dev_gro_receive(napi, skb); |
| 3580 | } |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3581 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3582 | 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] | 3583 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3584 | switch (ret) { |
| 3585 | case GRO_NORMAL: |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3586 | if (netif_receive_skb(skb)) |
| 3587 | ret = GRO_DROP; |
| 3588 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3589 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3590 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3591 | case GRO_MERGED_FREE: |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3592 | kfree_skb(skb); |
| 3593 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3594 | |
| 3595 | case GRO_HELD: |
| 3596 | case GRO_MERGED: |
| 3597 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3598 | } |
| 3599 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3600 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3601 | } |
| 3602 | EXPORT_SYMBOL(napi_skb_finish); |
| 3603 | |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3604 | void skb_gro_reset_offset(struct sk_buff *skb) |
| 3605 | { |
| 3606 | NAPI_GRO_CB(skb)->data_offset = 0; |
| 3607 | NAPI_GRO_CB(skb)->frag0 = NULL; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3608 | NAPI_GRO_CB(skb)->frag0_len = 0; |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3609 | |
Herbert Xu | 78d3fd0 | 2009-05-26 18:50:23 +0000 | [diff] [blame] | 3610 | if (skb->mac_header == skb->tail && |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 3611 | !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) { |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3612 | NAPI_GRO_CB(skb)->frag0 = |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 3613 | skb_frag_address(&skb_shinfo(skb)->frags[0]); |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 3614 | NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]); |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3615 | } |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3616 | } |
| 3617 | EXPORT_SYMBOL(skb_gro_reset_offset); |
| 3618 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3619 | 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] | 3620 | { |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3621 | skb_gro_reset_offset(skb); |
| 3622 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3623 | return napi_skb_finish(__napi_gro_receive(napi, skb), skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3624 | } |
| 3625 | EXPORT_SYMBOL(napi_gro_receive); |
| 3626 | |
stephen hemminger | d0c2b0d | 2010-10-19 07:12:10 +0000 | [diff] [blame] | 3627 | 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] | 3628 | { |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3629 | __skb_pull(skb, skb_headlen(skb)); |
| 3630 | skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); |
Jesse Gross | 3701e51 | 2010-10-20 13:56:06 +0000 | [diff] [blame] | 3631 | skb->vlan_tci = 0; |
Herbert Xu | 66c46d7 | 2011-01-29 20:44:54 -0800 | [diff] [blame] | 3632 | skb->dev = napi->dev; |
Andy Gospodarek | 6d152e2 | 2011-02-02 14:53:25 -0800 | [diff] [blame] | 3633 | skb->skb_iif = 0; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3634 | |
| 3635 | napi->skb = skb; |
| 3636 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3637 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3638 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3639 | { |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3640 | struct sk_buff *skb = napi->skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3641 | |
| 3642 | if (!skb) { |
Eric Dumazet | 89d71a6 | 2009-10-13 05:34:20 +0000 | [diff] [blame] | 3643 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
| 3644 | if (skb) |
| 3645 | napi->skb = skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3646 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3647 | return skb; |
| 3648 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3649 | EXPORT_SYMBOL(napi_get_frags); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3650 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3651 | gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
| 3652 | gro_result_t ret) |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3653 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3654 | switch (ret) { |
| 3655 | case GRO_NORMAL: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3656 | case GRO_HELD: |
Ajit Khaparde | e76b69c | 2010-02-16 20:25:43 +0000 | [diff] [blame] | 3657 | skb->protocol = eth_type_trans(skb, skb->dev); |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3658 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3659 | if (ret == GRO_HELD) |
| 3660 | skb_gro_pull(skb, -ETH_HLEN); |
| 3661 | else if (netif_receive_skb(skb)) |
| 3662 | ret = GRO_DROP; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3663 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3664 | |
| 3665 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3666 | case GRO_MERGED_FREE: |
| 3667 | napi_reuse_skb(napi, skb); |
| 3668 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3669 | |
| 3670 | case GRO_MERGED: |
| 3671 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3672 | } |
| 3673 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3674 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3675 | } |
| 3676 | EXPORT_SYMBOL(napi_frags_finish); |
| 3677 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3678 | struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3679 | { |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3680 | struct sk_buff *skb = napi->skb; |
| 3681 | struct ethhdr *eth; |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 3682 | unsigned int hlen; |
| 3683 | unsigned int off; |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3684 | |
| 3685 | napi->skb = NULL; |
| 3686 | |
| 3687 | skb_reset_mac_header(skb); |
| 3688 | skb_gro_reset_offset(skb); |
| 3689 | |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 3690 | off = skb_gro_offset(skb); |
| 3691 | hlen = off + sizeof(*eth); |
| 3692 | eth = skb_gro_header_fast(skb, off); |
| 3693 | if (skb_gro_header_hard(skb, hlen)) { |
| 3694 | eth = skb_gro_header_slow(skb, hlen, off); |
| 3695 | if (unlikely(!eth)) { |
| 3696 | napi_reuse_skb(napi, skb); |
| 3697 | skb = NULL; |
| 3698 | goto out; |
| 3699 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3700 | } |
| 3701 | |
| 3702 | skb_gro_pull(skb, sizeof(*eth)); |
| 3703 | |
| 3704 | /* |
| 3705 | * This works because the only protocols we care about don't require |
| 3706 | * special handling. We'll fix it up properly at the end. |
| 3707 | */ |
| 3708 | skb->protocol = eth->h_proto; |
| 3709 | |
| 3710 | out: |
| 3711 | return skb; |
| 3712 | } |
| 3713 | EXPORT_SYMBOL(napi_frags_skb); |
| 3714 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3715 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3716 | { |
| 3717 | struct sk_buff *skb = napi_frags_skb(napi); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3718 | |
| 3719 | if (!skb) |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3720 | return GRO_DROP; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3721 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3722 | return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb)); |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3723 | } |
| 3724 | EXPORT_SYMBOL(napi_gro_frags); |
| 3725 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3726 | /* |
| 3727 | * net_rps_action sends any pending IPI's for rps. |
| 3728 | * Note: called with local irq disabled, but exits with local irq enabled. |
| 3729 | */ |
| 3730 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) |
| 3731 | { |
| 3732 | #ifdef CONFIG_RPS |
| 3733 | struct softnet_data *remsd = sd->rps_ipi_list; |
| 3734 | |
| 3735 | if (remsd) { |
| 3736 | sd->rps_ipi_list = NULL; |
| 3737 | |
| 3738 | local_irq_enable(); |
| 3739 | |
| 3740 | /* Send pending IPI's to kick RPS processing on remote cpus. */ |
| 3741 | while (remsd) { |
| 3742 | struct softnet_data *next = remsd->rps_ipi_next; |
| 3743 | |
| 3744 | if (cpu_online(remsd->cpu)) |
| 3745 | __smp_call_function_single(remsd->cpu, |
| 3746 | &remsd->csd, 0); |
| 3747 | remsd = next; |
| 3748 | } |
| 3749 | } else |
| 3750 | #endif |
| 3751 | local_irq_enable(); |
| 3752 | } |
| 3753 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3754 | static int process_backlog(struct napi_struct *napi, int quota) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3755 | { |
| 3756 | int work = 0; |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3757 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3758 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3759 | #ifdef CONFIG_RPS |
| 3760 | /* Check if we have pending ipi, its better to send them now, |
| 3761 | * not waiting net_rx_action() end. |
| 3762 | */ |
| 3763 | if (sd->rps_ipi_list) { |
| 3764 | local_irq_disable(); |
| 3765 | net_rps_action_and_irq_enable(sd); |
| 3766 | } |
| 3767 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3768 | napi->weight = weight_p; |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3769 | local_irq_disable(); |
| 3770 | while (work < quota) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3771 | struct sk_buff *skb; |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3772 | unsigned int qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3773 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3774 | while ((skb = __skb_dequeue(&sd->process_queue))) { |
Eric Dumazet | e400827 | 2010-04-05 15:42:39 -0700 | [diff] [blame] | 3775 | local_irq_enable(); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3776 | __netif_receive_skb(skb); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3777 | local_irq_disable(); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3778 | input_queue_head_incr(sd); |
| 3779 | if (++work >= quota) { |
| 3780 | local_irq_enable(); |
| 3781 | return work; |
| 3782 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3783 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3784 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3785 | rps_lock(sd); |
| 3786 | qlen = skb_queue_len(&sd->input_pkt_queue); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3787 | if (qlen) |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3788 | skb_queue_splice_tail_init(&sd->input_pkt_queue, |
| 3789 | &sd->process_queue); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3790 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3791 | if (qlen < quota - work) { |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3792 | /* |
| 3793 | * Inline a custom version of __napi_complete(). |
| 3794 | * only current cpu owns and manipulates this napi, |
| 3795 | * and NAPI_STATE_SCHED is the only possible flag set on backlog. |
| 3796 | * we can use a plain write instead of clear_bit(), |
| 3797 | * and we dont need an smp_mb() memory barrier. |
| 3798 | */ |
| 3799 | list_del(&napi->poll_list); |
| 3800 | napi->state = 0; |
| 3801 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3802 | quota = work + qlen; |
| 3803 | } |
| 3804 | rps_unlock(sd); |
| 3805 | } |
| 3806 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3807 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3808 | return work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3809 | } |
| 3810 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3811 | /** |
| 3812 | * __napi_schedule - schedule for receive |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 3813 | * @n: entry to schedule |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3814 | * |
| 3815 | * The entry's receive function will be scheduled to run |
| 3816 | */ |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 3817 | void __napi_schedule(struct napi_struct *n) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3818 | { |
| 3819 | unsigned long flags; |
| 3820 | |
| 3821 | local_irq_save(flags); |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3822 | ____napi_schedule(&__get_cpu_var(softnet_data), n); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3823 | local_irq_restore(flags); |
| 3824 | } |
| 3825 | EXPORT_SYMBOL(__napi_schedule); |
| 3826 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3827 | void __napi_complete(struct napi_struct *n) |
| 3828 | { |
| 3829 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); |
| 3830 | BUG_ON(n->gro_list); |
| 3831 | |
| 3832 | list_del(&n->poll_list); |
| 3833 | smp_mb__before_clear_bit(); |
| 3834 | clear_bit(NAPI_STATE_SCHED, &n->state); |
| 3835 | } |
| 3836 | EXPORT_SYMBOL(__napi_complete); |
| 3837 | |
| 3838 | void napi_complete(struct napi_struct *n) |
| 3839 | { |
| 3840 | unsigned long flags; |
| 3841 | |
| 3842 | /* |
| 3843 | * don't let napi dequeue from the cpu poll list |
| 3844 | * just in case its running on a different cpu |
| 3845 | */ |
| 3846 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) |
| 3847 | return; |
| 3848 | |
| 3849 | napi_gro_flush(n); |
| 3850 | local_irq_save(flags); |
| 3851 | __napi_complete(n); |
| 3852 | local_irq_restore(flags); |
| 3853 | } |
| 3854 | EXPORT_SYMBOL(napi_complete); |
| 3855 | |
| 3856 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
| 3857 | int (*poll)(struct napi_struct *, int), int weight) |
| 3858 | { |
| 3859 | INIT_LIST_HEAD(&napi->poll_list); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3860 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3861 | napi->gro_list = NULL; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3862 | napi->skb = NULL; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3863 | napi->poll = poll; |
| 3864 | napi->weight = weight; |
| 3865 | list_add(&napi->dev_list, &dev->napi_list); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3866 | napi->dev = dev; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3867 | #ifdef CONFIG_NETPOLL |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3868 | spin_lock_init(&napi->poll_lock); |
| 3869 | napi->poll_owner = -1; |
| 3870 | #endif |
| 3871 | set_bit(NAPI_STATE_SCHED, &napi->state); |
| 3872 | } |
| 3873 | EXPORT_SYMBOL(netif_napi_add); |
| 3874 | |
| 3875 | void netif_napi_del(struct napi_struct *napi) |
| 3876 | { |
| 3877 | struct sk_buff *skb, *next; |
| 3878 | |
Peter P Waskiewicz Jr | d7b0663 | 2008-12-26 01:35:35 -0800 | [diff] [blame] | 3879 | list_del_init(&napi->dev_list); |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3880 | napi_free_frags(napi); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3881 | |
| 3882 | for (skb = napi->gro_list; skb; skb = next) { |
| 3883 | next = skb->next; |
| 3884 | skb->next = NULL; |
| 3885 | kfree_skb(skb); |
| 3886 | } |
| 3887 | |
| 3888 | napi->gro_list = NULL; |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3889 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3890 | } |
| 3891 | EXPORT_SYMBOL(netif_napi_del); |
| 3892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3893 | static void net_rx_action(struct softirq_action *h) |
| 3894 | { |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3895 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3896 | unsigned long time_limit = jiffies + 2; |
Stephen Hemminger | 51b0bde | 2005-06-23 20:14:40 -0700 | [diff] [blame] | 3897 | int budget = netdev_budget; |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 3898 | void *have; |
| 3899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3900 | local_irq_disable(); |
| 3901 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3902 | while (!list_empty(&sd->poll_list)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3903 | struct napi_struct *n; |
| 3904 | int work, weight; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3905 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3906 | /* If softirq window is exhuasted then punt. |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3907 | * Allow this to run for 2 jiffies since which will allow |
| 3908 | * an average latency of 1.5/HZ. |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3909 | */ |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3910 | if (unlikely(budget <= 0 || time_after(jiffies, time_limit))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3911 | goto softnet_break; |
| 3912 | |
| 3913 | local_irq_enable(); |
| 3914 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3915 | /* Even though interrupts have been re-enabled, this |
| 3916 | * access is safe because interrupts can only add new |
| 3917 | * entries to the tail of this list, and only ->poll() |
| 3918 | * calls can remove this head entry from the list. |
| 3919 | */ |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3920 | n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3921 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3922 | have = netpoll_poll_lock(n); |
| 3923 | |
| 3924 | weight = n->weight; |
| 3925 | |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 3926 | /* This NAPI_STATE_SCHED test is for avoiding a race |
| 3927 | * with netpoll's poll_napi(). Only the entity which |
| 3928 | * obtains the lock and sees NAPI_STATE_SCHED set will |
| 3929 | * actually make the ->poll() call. Therefore we avoid |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3930 | * accidentally calling ->poll() when NAPI is not scheduled. |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 3931 | */ |
| 3932 | work = 0; |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 3933 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 3934 | work = n->poll(n, weight); |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 3935 | trace_napi_poll(n); |
| 3936 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3937 | |
| 3938 | WARN_ON_ONCE(work > weight); |
| 3939 | |
| 3940 | budget -= work; |
| 3941 | |
| 3942 | local_irq_disable(); |
| 3943 | |
| 3944 | /* Drivers must not modify the NAPI state if they |
| 3945 | * consume the entire weight. In such cases this code |
| 3946 | * still "owns" the NAPI instance and therefore can |
| 3947 | * move the instance around on the list at-will. |
| 3948 | */ |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 3949 | if (unlikely(work == weight)) { |
Herbert Xu | ff780cd | 2009-06-26 19:27:04 -0700 | [diff] [blame] | 3950 | if (unlikely(napi_disable_pending(n))) { |
| 3951 | local_irq_enable(); |
| 3952 | napi_complete(n); |
| 3953 | local_irq_disable(); |
| 3954 | } else |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3955 | list_move_tail(&n->poll_list, &sd->poll_list); |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 3956 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3957 | |
| 3958 | netpoll_poll_unlock(have); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3959 | } |
| 3960 | out: |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3961 | net_rps_action_and_irq_enable(sd); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3962 | |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 3963 | #ifdef CONFIG_NET_DMA |
| 3964 | /* |
| 3965 | * There may not be any more sk_buffs coming right now, so push |
| 3966 | * any pending DMA copies to hardware |
| 3967 | */ |
Dan Williams | 2ba0562 | 2009-01-06 11:38:14 -0700 | [diff] [blame] | 3968 | dma_issue_pending_all(); |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 3969 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3971 | return; |
| 3972 | |
| 3973 | softnet_break: |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3974 | sd->time_squeeze++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3975 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 3976 | goto out; |
| 3977 | } |
| 3978 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3979 | static gifconf_func_t *gifconf_list[NPROTO]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3980 | |
| 3981 | /** |
| 3982 | * register_gifconf - register a SIOCGIF handler |
| 3983 | * @family: Address family |
| 3984 | * @gifconf: Function handler |
| 3985 | * |
| 3986 | * Register protocol dependent address dumping routines. The handler |
| 3987 | * that is passed must not be freed or reused until it has been replaced |
| 3988 | * by another handler. |
| 3989 | */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3990 | int register_gifconf(unsigned int family, gifconf_func_t *gifconf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3991 | { |
| 3992 | if (family >= NPROTO) |
| 3993 | return -EINVAL; |
| 3994 | gifconf_list[family] = gifconf; |
| 3995 | return 0; |
| 3996 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3997 | EXPORT_SYMBOL(register_gifconf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3998 | |
| 3999 | |
| 4000 | /* |
| 4001 | * Map an interface index to its name (SIOCGIFNAME) |
| 4002 | */ |
| 4003 | |
| 4004 | /* |
| 4005 | * We need this ioctl for efficient implementation of the |
| 4006 | * if_indextoname() function required by the IPv6 API. Without |
| 4007 | * it, we would have to search all the interfaces to find a |
| 4008 | * match. --pb |
| 4009 | */ |
| 4010 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4011 | static int dev_ifname(struct net *net, struct ifreq __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4012 | { |
| 4013 | struct net_device *dev; |
| 4014 | struct ifreq ifr; |
| 4015 | |
| 4016 | /* |
| 4017 | * Fetch the caller's info block. |
| 4018 | */ |
| 4019 | |
| 4020 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 4021 | return -EFAULT; |
| 4022 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 4023 | rcu_read_lock(); |
| 4024 | dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4025 | if (!dev) { |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 4026 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4027 | return -ENODEV; |
| 4028 | } |
| 4029 | |
| 4030 | strcpy(ifr.ifr_name, dev->name); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 4031 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4032 | |
| 4033 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) |
| 4034 | return -EFAULT; |
| 4035 | return 0; |
| 4036 | } |
| 4037 | |
| 4038 | /* |
| 4039 | * Perform a SIOCGIFCONF call. This structure will change |
| 4040 | * size eventually, and there is nothing I can do about it. |
| 4041 | * Thus we will need a 'compatibility mode'. |
| 4042 | */ |
| 4043 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4044 | static int dev_ifconf(struct net *net, char __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4045 | { |
| 4046 | struct ifconf ifc; |
| 4047 | struct net_device *dev; |
| 4048 | char __user *pos; |
| 4049 | int len; |
| 4050 | int total; |
| 4051 | int i; |
| 4052 | |
| 4053 | /* |
| 4054 | * Fetch the caller's info block. |
| 4055 | */ |
| 4056 | |
| 4057 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) |
| 4058 | return -EFAULT; |
| 4059 | |
| 4060 | pos = ifc.ifc_buf; |
| 4061 | len = ifc.ifc_len; |
| 4062 | |
| 4063 | /* |
| 4064 | * Loop over the interfaces, and write an info block for each. |
| 4065 | */ |
| 4066 | |
| 4067 | total = 0; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4068 | for_each_netdev(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4069 | for (i = 0; i < NPROTO; i++) { |
| 4070 | if (gifconf_list[i]) { |
| 4071 | int done; |
| 4072 | if (!pos) |
| 4073 | done = gifconf_list[i](dev, NULL, 0); |
| 4074 | else |
| 4075 | done = gifconf_list[i](dev, pos + total, |
| 4076 | len - total); |
| 4077 | if (done < 0) |
| 4078 | return -EFAULT; |
| 4079 | total += done; |
| 4080 | } |
| 4081 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 4082 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4083 | |
| 4084 | /* |
| 4085 | * All done. Write the updated control block back to the caller. |
| 4086 | */ |
| 4087 | ifc.ifc_len = total; |
| 4088 | |
| 4089 | /* |
| 4090 | * Both BSD and Solaris return 0 here, so we do too. |
| 4091 | */ |
| 4092 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; |
| 4093 | } |
| 4094 | |
| 4095 | #ifdef CONFIG_PROC_FS |
Mihai Maruseac | f04565d | 2011-10-20 20:45:10 +0000 | [diff] [blame] | 4096 | |
| 4097 | #define BUCKET_SPACE (32 - NETDEV_HASHBITS) |
| 4098 | |
| 4099 | struct dev_iter_state { |
| 4100 | struct seq_net_private p; |
| 4101 | unsigned int pos; /* bucket << BUCKET_SPACE + offset */ |
| 4102 | }; |
| 4103 | |
| 4104 | #define get_bucket(x) ((x) >> BUCKET_SPACE) |
| 4105 | #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1)) |
| 4106 | #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o)) |
| 4107 | |
| 4108 | static inline struct net_device *dev_from_same_bucket(struct seq_file *seq) |
| 4109 | { |
| 4110 | struct dev_iter_state *state = seq->private; |
| 4111 | struct net *net = seq_file_net(seq); |
| 4112 | struct net_device *dev; |
| 4113 | struct hlist_node *p; |
| 4114 | struct hlist_head *h; |
| 4115 | unsigned int count, bucket, offset; |
| 4116 | |
| 4117 | bucket = get_bucket(state->pos); |
| 4118 | offset = get_offset(state->pos); |
| 4119 | h = &net->dev_name_head[bucket]; |
| 4120 | count = 0; |
| 4121 | hlist_for_each_entry_rcu(dev, p, h, name_hlist) { |
| 4122 | if (count++ == offset) { |
| 4123 | state->pos = set_bucket_offset(bucket, count); |
| 4124 | return dev; |
| 4125 | } |
| 4126 | } |
| 4127 | |
| 4128 | return NULL; |
| 4129 | } |
| 4130 | |
| 4131 | static inline struct net_device *dev_from_new_bucket(struct seq_file *seq) |
| 4132 | { |
| 4133 | struct dev_iter_state *state = seq->private; |
| 4134 | struct net_device *dev; |
| 4135 | unsigned int bucket; |
| 4136 | |
| 4137 | bucket = get_bucket(state->pos); |
| 4138 | do { |
| 4139 | dev = dev_from_same_bucket(seq); |
| 4140 | if (dev) |
| 4141 | return dev; |
| 4142 | |
| 4143 | bucket++; |
| 4144 | state->pos = set_bucket_offset(bucket, 0); |
| 4145 | } while (bucket < NETDEV_HASHENTRIES); |
| 4146 | |
| 4147 | return NULL; |
| 4148 | } |
| 4149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4150 | /* |
| 4151 | * This is invoked by the /proc filesystem handler to display a device |
| 4152 | * in detail. |
| 4153 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4154 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 4155 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4156 | { |
Mihai Maruseac | f04565d | 2011-10-20 20:45:10 +0000 | [diff] [blame] | 4157 | struct dev_iter_state *state = seq->private; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 4158 | |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 4159 | rcu_read_lock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 4160 | if (!*pos) |
| 4161 | return SEQ_START_TOKEN; |
| 4162 | |
Mihai Maruseac | f04565d | 2011-10-20 20:45:10 +0000 | [diff] [blame] | 4163 | /* check for end of the hash */ |
| 4164 | if (state->pos == 0 && *pos > 1) |
| 4165 | return NULL; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 4166 | |
Mihai Maruseac | f04565d | 2011-10-20 20:45:10 +0000 | [diff] [blame] | 4167 | return dev_from_new_bucket(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4168 | } |
| 4169 | |
| 4170 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 4171 | { |
Mihai Maruseac | f04565d | 2011-10-20 20:45:10 +0000 | [diff] [blame] | 4172 | struct net_device *dev; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 4173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4174 | ++*pos; |
Mihai Maruseac | f04565d | 2011-10-20 20:45:10 +0000 | [diff] [blame] | 4175 | |
| 4176 | if (v == SEQ_START_TOKEN) |
| 4177 | return dev_from_new_bucket(seq); |
| 4178 | |
| 4179 | dev = dev_from_same_bucket(seq); |
| 4180 | if (dev) |
| 4181 | return dev; |
| 4182 | |
| 4183 | return dev_from_new_bucket(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4184 | } |
| 4185 | |
| 4186 | void dev_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 4187 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4188 | { |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 4189 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4190 | } |
| 4191 | |
| 4192 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) |
| 4193 | { |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 4194 | struct rtnl_link_stats64 temp; |
| 4195 | const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4196 | |
Ben Hutchings | be1f3c2 | 2010-06-08 07:19:54 +0000 | [diff] [blame] | 4197 | seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu " |
| 4198 | "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n", |
Rusty Russell | 5a1b589 | 2007-04-28 21:04:03 -0700 | [diff] [blame] | 4199 | dev->name, stats->rx_bytes, stats->rx_packets, |
| 4200 | stats->rx_errors, |
| 4201 | stats->rx_dropped + stats->rx_missed_errors, |
| 4202 | stats->rx_fifo_errors, |
| 4203 | stats->rx_length_errors + stats->rx_over_errors + |
| 4204 | stats->rx_crc_errors + stats->rx_frame_errors, |
| 4205 | stats->rx_compressed, stats->multicast, |
| 4206 | stats->tx_bytes, stats->tx_packets, |
| 4207 | stats->tx_errors, stats->tx_dropped, |
| 4208 | stats->tx_fifo_errors, stats->collisions, |
| 4209 | stats->tx_carrier_errors + |
| 4210 | stats->tx_aborted_errors + |
| 4211 | stats->tx_window_errors + |
| 4212 | stats->tx_heartbeat_errors, |
| 4213 | stats->tx_compressed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4214 | } |
| 4215 | |
| 4216 | /* |
| 4217 | * Called from the PROCfs module. This now uses the new arbitrary sized |
| 4218 | * /proc/net interface to create /proc/net/dev |
| 4219 | */ |
| 4220 | static int dev_seq_show(struct seq_file *seq, void *v) |
| 4221 | { |
| 4222 | if (v == SEQ_START_TOKEN) |
| 4223 | seq_puts(seq, "Inter-| Receive " |
| 4224 | " | Transmit\n" |
| 4225 | " face |bytes packets errs drop fifo frame " |
| 4226 | "compressed multicast|bytes packets errs " |
| 4227 | "drop fifo colls carrier compressed\n"); |
| 4228 | else |
| 4229 | dev_seq_printf_stats(seq, v); |
| 4230 | return 0; |
| 4231 | } |
| 4232 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4233 | static struct softnet_data *softnet_get_online(loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4234 | { |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4235 | struct softnet_data *sd = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4236 | |
Mike Travis | 0c0b0ac | 2008-05-02 16:43:08 -0700 | [diff] [blame] | 4237 | while (*pos < nr_cpu_ids) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 4238 | if (cpu_online(*pos)) { |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4239 | sd = &per_cpu(softnet_data, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4240 | break; |
| 4241 | } else |
| 4242 | ++*pos; |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4243 | return sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4244 | } |
| 4245 | |
| 4246 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) |
| 4247 | { |
| 4248 | return softnet_get_online(pos); |
| 4249 | } |
| 4250 | |
| 4251 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 4252 | { |
| 4253 | ++*pos; |
| 4254 | return softnet_get_online(pos); |
| 4255 | } |
| 4256 | |
| 4257 | static void softnet_seq_stop(struct seq_file *seq, void *v) |
| 4258 | { |
| 4259 | } |
| 4260 | |
| 4261 | static int softnet_seq_show(struct seq_file *seq, void *v) |
| 4262 | { |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4263 | struct softnet_data *sd = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4264 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 4265 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4266 | sd->processed, sd->dropped, sd->time_squeeze, 0, |
Stephen Hemminger | c1ebcdb | 2005-06-23 20:08:59 -0700 | [diff] [blame] | 4267 | 0, 0, 0, 0, /* was fastroute */ |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 4268 | sd->cpu_collision, sd->received_rps); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4269 | return 0; |
| 4270 | } |
| 4271 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 4272 | static const struct seq_operations dev_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4273 | .start = dev_seq_start, |
| 4274 | .next = dev_seq_next, |
| 4275 | .stop = dev_seq_stop, |
| 4276 | .show = dev_seq_show, |
| 4277 | }; |
| 4278 | |
| 4279 | static int dev_seq_open(struct inode *inode, struct file *file) |
| 4280 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4281 | return seq_open_net(inode, file, &dev_seq_ops, |
Mihai Maruseac | f04565d | 2011-10-20 20:45:10 +0000 | [diff] [blame] | 4282 | sizeof(struct dev_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4283 | } |
| 4284 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 4285 | static const struct file_operations dev_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4286 | .owner = THIS_MODULE, |
| 4287 | .open = dev_seq_open, |
| 4288 | .read = seq_read, |
| 4289 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4290 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4291 | }; |
| 4292 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 4293 | static const struct seq_operations softnet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4294 | .start = softnet_seq_start, |
| 4295 | .next = softnet_seq_next, |
| 4296 | .stop = softnet_seq_stop, |
| 4297 | .show = softnet_seq_show, |
| 4298 | }; |
| 4299 | |
| 4300 | static int softnet_seq_open(struct inode *inode, struct file *file) |
| 4301 | { |
| 4302 | return seq_open(file, &softnet_seq_ops); |
| 4303 | } |
| 4304 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 4305 | static const struct file_operations softnet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4306 | .owner = THIS_MODULE, |
| 4307 | .open = softnet_seq_open, |
| 4308 | .read = seq_read, |
| 4309 | .llseek = seq_lseek, |
| 4310 | .release = seq_release, |
| 4311 | }; |
| 4312 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4313 | static void *ptype_get_idx(loff_t pos) |
| 4314 | { |
| 4315 | struct packet_type *pt = NULL; |
| 4316 | loff_t i = 0; |
| 4317 | int t; |
| 4318 | |
| 4319 | list_for_each_entry_rcu(pt, &ptype_all, list) { |
| 4320 | if (i == pos) |
| 4321 | return pt; |
| 4322 | ++i; |
| 4323 | } |
| 4324 | |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 4325 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4326 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
| 4327 | if (i == pos) |
| 4328 | return pt; |
| 4329 | ++i; |
| 4330 | } |
| 4331 | } |
| 4332 | return NULL; |
| 4333 | } |
| 4334 | |
| 4335 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 4336 | __acquires(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4337 | { |
| 4338 | rcu_read_lock(); |
| 4339 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; |
| 4340 | } |
| 4341 | |
| 4342 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 4343 | { |
| 4344 | struct packet_type *pt; |
| 4345 | struct list_head *nxt; |
| 4346 | int hash; |
| 4347 | |
| 4348 | ++*pos; |
| 4349 | if (v == SEQ_START_TOKEN) |
| 4350 | return ptype_get_idx(0); |
| 4351 | |
| 4352 | pt = v; |
| 4353 | nxt = pt->list.next; |
| 4354 | if (pt->type == htons(ETH_P_ALL)) { |
| 4355 | if (nxt != &ptype_all) |
| 4356 | goto found; |
| 4357 | hash = 0; |
| 4358 | nxt = ptype_base[0].next; |
| 4359 | } else |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 4360 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4361 | |
| 4362 | while (nxt == &ptype_base[hash]) { |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 4363 | if (++hash >= PTYPE_HASH_SIZE) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4364 | return NULL; |
| 4365 | nxt = ptype_base[hash].next; |
| 4366 | } |
| 4367 | found: |
| 4368 | return list_entry(nxt, struct packet_type, list); |
| 4369 | } |
| 4370 | |
| 4371 | static void ptype_seq_stop(struct seq_file *seq, void *v) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 4372 | __releases(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4373 | { |
| 4374 | rcu_read_unlock(); |
| 4375 | } |
| 4376 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4377 | static int ptype_seq_show(struct seq_file *seq, void *v) |
| 4378 | { |
| 4379 | struct packet_type *pt = v; |
| 4380 | |
| 4381 | if (v == SEQ_START_TOKEN) |
| 4382 | seq_puts(seq, "Type Device Function\n"); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 4383 | else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4384 | if (pt->type == htons(ETH_P_ALL)) |
| 4385 | seq_puts(seq, "ALL "); |
| 4386 | else |
| 4387 | seq_printf(seq, "%04x", ntohs(pt->type)); |
| 4388 | |
Alexey Dobriyan | 908cd2d | 2008-11-16 19:50:35 -0800 | [diff] [blame] | 4389 | seq_printf(seq, " %-8s %pF\n", |
| 4390 | pt->dev ? pt->dev->name : "", pt->func); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4391 | } |
| 4392 | |
| 4393 | return 0; |
| 4394 | } |
| 4395 | |
| 4396 | static const struct seq_operations ptype_seq_ops = { |
| 4397 | .start = ptype_seq_start, |
| 4398 | .next = ptype_seq_next, |
| 4399 | .stop = ptype_seq_stop, |
| 4400 | .show = ptype_seq_show, |
| 4401 | }; |
| 4402 | |
| 4403 | static int ptype_seq_open(struct inode *inode, struct file *file) |
| 4404 | { |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 4405 | return seq_open_net(inode, file, &ptype_seq_ops, |
| 4406 | sizeof(struct seq_net_private)); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4407 | } |
| 4408 | |
| 4409 | static const struct file_operations ptype_seq_fops = { |
| 4410 | .owner = THIS_MODULE, |
| 4411 | .open = ptype_seq_open, |
| 4412 | .read = seq_read, |
| 4413 | .llseek = seq_lseek, |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 4414 | .release = seq_release_net, |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4415 | }; |
| 4416 | |
| 4417 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 4418 | static int __net_init dev_proc_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4419 | { |
| 4420 | int rc = -ENOMEM; |
| 4421 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4422 | if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4423 | goto out; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4424 | if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4425 | goto out_dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4426 | if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops)) |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 4427 | goto out_softnet; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 4428 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4429 | if (wext_proc_init(net)) |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 4430 | goto out_ptype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4431 | rc = 0; |
| 4432 | out: |
| 4433 | return rc; |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 4434 | out_ptype: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4435 | proc_net_remove(net, "ptype"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4436 | out_softnet: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4437 | proc_net_remove(net, "softnet_stat"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4438 | out_dev: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4439 | proc_net_remove(net, "dev"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4440 | goto out; |
| 4441 | } |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4442 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 4443 | static void __net_exit dev_proc_net_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4444 | { |
| 4445 | wext_proc_exit(net); |
| 4446 | |
| 4447 | proc_net_remove(net, "ptype"); |
| 4448 | proc_net_remove(net, "softnet_stat"); |
| 4449 | proc_net_remove(net, "dev"); |
| 4450 | } |
| 4451 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 4452 | static struct pernet_operations __net_initdata dev_proc_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4453 | .init = dev_proc_net_init, |
| 4454 | .exit = dev_proc_net_exit, |
| 4455 | }; |
| 4456 | |
| 4457 | static int __init dev_proc_init(void) |
| 4458 | { |
| 4459 | return register_pernet_subsys(&dev_proc_ops); |
| 4460 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4461 | #else |
| 4462 | #define dev_proc_init() 0 |
| 4463 | #endif /* CONFIG_PROC_FS */ |
| 4464 | |
| 4465 | |
| 4466 | /** |
Jiri Pirko | 1765a57 | 2011-02-12 06:48:36 +0000 | [diff] [blame] | 4467 | * netdev_set_master - set up master pointer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4468 | * @slave: slave device |
| 4469 | * @master: new master device |
| 4470 | * |
| 4471 | * Changes the master device of the slave. Pass %NULL to break the |
| 4472 | * bonding. The caller must hold the RTNL semaphore. On a failure |
| 4473 | * a negative errno code is returned. On success the reference counts |
Jiri Pirko | 1765a57 | 2011-02-12 06:48:36 +0000 | [diff] [blame] | 4474 | * are adjusted and the function returns zero. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4475 | */ |
| 4476 | int netdev_set_master(struct net_device *slave, struct net_device *master) |
| 4477 | { |
| 4478 | struct net_device *old = slave->master; |
| 4479 | |
| 4480 | ASSERT_RTNL(); |
| 4481 | |
| 4482 | if (master) { |
| 4483 | if (old) |
| 4484 | return -EBUSY; |
| 4485 | dev_hold(master); |
| 4486 | } |
| 4487 | |
| 4488 | slave->master = master; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 4489 | |
Eric Dumazet | 6df427f | 2011-05-19 19:37:40 +0000 | [diff] [blame] | 4490 | if (old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4491 | dev_put(old); |
Jiri Pirko | 1765a57 | 2011-02-12 06:48:36 +0000 | [diff] [blame] | 4492 | return 0; |
| 4493 | } |
| 4494 | EXPORT_SYMBOL(netdev_set_master); |
| 4495 | |
| 4496 | /** |
| 4497 | * netdev_set_bond_master - set up bonding master/slave pair |
| 4498 | * @slave: slave device |
| 4499 | * @master: new master device |
| 4500 | * |
| 4501 | * Changes the master device of the slave. Pass %NULL to break the |
| 4502 | * bonding. The caller must hold the RTNL semaphore. On a failure |
| 4503 | * a negative errno code is returned. On success %RTM_NEWLINK is sent |
| 4504 | * to the routing socket and the function returns zero. |
| 4505 | */ |
| 4506 | int netdev_set_bond_master(struct net_device *slave, struct net_device *master) |
| 4507 | { |
| 4508 | int err; |
| 4509 | |
| 4510 | ASSERT_RTNL(); |
| 4511 | |
| 4512 | err = netdev_set_master(slave, master); |
| 4513 | if (err) |
| 4514 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4515 | if (master) |
| 4516 | slave->flags |= IFF_SLAVE; |
| 4517 | else |
| 4518 | slave->flags &= ~IFF_SLAVE; |
| 4519 | |
| 4520 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); |
| 4521 | return 0; |
| 4522 | } |
Jiri Pirko | 1765a57 | 2011-02-12 06:48:36 +0000 | [diff] [blame] | 4523 | EXPORT_SYMBOL(netdev_set_bond_master); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4524 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4525 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
| 4526 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4527 | const struct net_device_ops *ops = dev->netdev_ops; |
| 4528 | |
| 4529 | if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags) |
| 4530 | ops->ndo_change_rx_flags(dev, flags); |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4531 | } |
| 4532 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4533 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4534 | { |
| 4535 | unsigned short old_flags = dev->flags; |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4536 | uid_t uid; |
| 4537 | gid_t gid; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4538 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4539 | ASSERT_RTNL(); |
| 4540 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4541 | dev->flags |= IFF_PROMISC; |
| 4542 | dev->promiscuity += inc; |
| 4543 | if (dev->promiscuity == 0) { |
| 4544 | /* |
| 4545 | * Avoid overflow. |
| 4546 | * If inc causes overflow, untouch promisc and return error. |
| 4547 | */ |
| 4548 | if (inc < 0) |
| 4549 | dev->flags &= ~IFF_PROMISC; |
| 4550 | else { |
| 4551 | dev->promiscuity -= inc; |
| 4552 | printk(KERN_WARNING "%s: promiscuity touches roof, " |
| 4553 | "set promiscuity failed, promiscuity feature " |
| 4554 | "of device might be broken.\n", dev->name); |
| 4555 | return -EOVERFLOW; |
| 4556 | } |
| 4557 | } |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4558 | if (dev->flags != old_flags) { |
| 4559 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
| 4560 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : |
| 4561 | "left"); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4562 | if (audit_enabled) { |
| 4563 | current_uid_gid(&uid, &gid); |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 4564 | audit_log(current->audit_context, GFP_ATOMIC, |
| 4565 | AUDIT_ANOM_PROMISCUOUS, |
| 4566 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", |
| 4567 | dev->name, (dev->flags & IFF_PROMISC), |
| 4568 | (old_flags & IFF_PROMISC), |
| 4569 | audit_get_loginuid(current), |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4570 | uid, gid, |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 4571 | audit_get_sessionid(current)); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4572 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4573 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4574 | dev_change_rx_flags(dev, IFF_PROMISC); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4575 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4576 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4577 | } |
| 4578 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4579 | /** |
| 4580 | * dev_set_promiscuity - update promiscuity count on a device |
| 4581 | * @dev: device |
| 4582 | * @inc: modifier |
| 4583 | * |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 4584 | * 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] | 4585 | * remains above zero the interface remains promiscuous. Once it hits zero |
| 4586 | * the device reverts back to normal filtering operation. A negative inc |
| 4587 | * value is used to drop promiscuity on the device. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4588 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4589 | */ |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4590 | int dev_set_promiscuity(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4591 | { |
| 4592 | unsigned short old_flags = dev->flags; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4593 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4594 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4595 | err = __dev_set_promiscuity(dev, inc); |
Patrick McHardy | 4b5a698 | 2008-07-06 15:49:08 -0700 | [diff] [blame] | 4596 | if (err < 0) |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4597 | return err; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4598 | if (dev->flags != old_flags) |
| 4599 | dev_set_rx_mode(dev); |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4600 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4601 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4602 | EXPORT_SYMBOL(dev_set_promiscuity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4603 | |
| 4604 | /** |
| 4605 | * dev_set_allmulti - update allmulti count on a device |
| 4606 | * @dev: device |
| 4607 | * @inc: modifier |
| 4608 | * |
| 4609 | * Add or remove reception of all multicast frames to a device. While the |
| 4610 | * count in the device remains above zero the interface remains listening |
| 4611 | * to all interfaces. Once it hits zero the device reverts back to normal |
| 4612 | * filtering operation. A negative @inc value is used to drop the counter |
| 4613 | * when releasing a resource needing all multicasts. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4614 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4615 | */ |
| 4616 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4617 | int dev_set_allmulti(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4618 | { |
| 4619 | unsigned short old_flags = dev->flags; |
| 4620 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4621 | ASSERT_RTNL(); |
| 4622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4623 | dev->flags |= IFF_ALLMULTI; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4624 | dev->allmulti += inc; |
| 4625 | if (dev->allmulti == 0) { |
| 4626 | /* |
| 4627 | * Avoid overflow. |
| 4628 | * If inc causes overflow, untouch allmulti and return error. |
| 4629 | */ |
| 4630 | if (inc < 0) |
| 4631 | dev->flags &= ~IFF_ALLMULTI; |
| 4632 | else { |
| 4633 | dev->allmulti -= inc; |
| 4634 | printk(KERN_WARNING "%s: allmulti touches roof, " |
| 4635 | "set allmulti failed, allmulti feature of " |
| 4636 | "device might be broken.\n", dev->name); |
| 4637 | return -EOVERFLOW; |
| 4638 | } |
| 4639 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4640 | if (dev->flags ^ old_flags) { |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4641 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4642 | dev_set_rx_mode(dev); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4643 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4644 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4645 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4646 | EXPORT_SYMBOL(dev_set_allmulti); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4647 | |
| 4648 | /* |
| 4649 | * Upload unicast and multicast address lists to device and |
| 4650 | * configure RX filtering. When the device doesn't support unicast |
Joe Perches | 53ccaae | 2007-12-20 14:02:06 -0800 | [diff] [blame] | 4651 | * filtering it is put in promiscuous mode while unicast addresses |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4652 | * are present. |
| 4653 | */ |
| 4654 | void __dev_set_rx_mode(struct net_device *dev) |
| 4655 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4656 | const struct net_device_ops *ops = dev->netdev_ops; |
| 4657 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4658 | /* dev_open will call this function so the list will stay sane. */ |
| 4659 | if (!(dev->flags&IFF_UP)) |
| 4660 | return; |
| 4661 | |
| 4662 | if (!netif_device_present(dev)) |
YOSHIFUJI Hideaki | 40b77c9 | 2007-07-19 10:43:23 +0900 | [diff] [blame] | 4663 | return; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4664 | |
Jiri Pirko | 0178934 | 2011-08-16 06:29:00 +0000 | [diff] [blame] | 4665 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4666 | /* Unicast addresses changes may only happen under the rtnl, |
| 4667 | * therefore calling __dev_set_promiscuity here is safe. |
| 4668 | */ |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4669 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4670 | __dev_set_promiscuity(dev, 1); |
Joe Perches | 2d348d1 | 2011-07-25 16:17:35 -0700 | [diff] [blame] | 4671 | dev->uc_promisc = true; |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4672 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4673 | __dev_set_promiscuity(dev, -1); |
Joe Perches | 2d348d1 | 2011-07-25 16:17:35 -0700 | [diff] [blame] | 4674 | dev->uc_promisc = false; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4675 | } |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4676 | } |
Jiri Pirko | 0178934 | 2011-08-16 06:29:00 +0000 | [diff] [blame] | 4677 | |
| 4678 | if (ops->ndo_set_rx_mode) |
| 4679 | ops->ndo_set_rx_mode(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4680 | } |
| 4681 | |
| 4682 | void dev_set_rx_mode(struct net_device *dev) |
| 4683 | { |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4684 | netif_addr_lock_bh(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4685 | __dev_set_rx_mode(dev); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4686 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4687 | } |
| 4688 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4689 | /** |
| 4690 | * dev_get_flags - get flags reported to userspace |
| 4691 | * @dev: device |
| 4692 | * |
| 4693 | * Get the combination of flag bits exported through APIs to userspace. |
| 4694 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4695 | unsigned dev_get_flags(const struct net_device *dev) |
| 4696 | { |
| 4697 | unsigned flags; |
| 4698 | |
| 4699 | flags = (dev->flags & ~(IFF_PROMISC | |
| 4700 | IFF_ALLMULTI | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4701 | IFF_RUNNING | |
| 4702 | IFF_LOWER_UP | |
| 4703 | IFF_DORMANT)) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4704 | (dev->gflags & (IFF_PROMISC | |
| 4705 | IFF_ALLMULTI)); |
| 4706 | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4707 | if (netif_running(dev)) { |
| 4708 | if (netif_oper_up(dev)) |
| 4709 | flags |= IFF_RUNNING; |
| 4710 | if (netif_carrier_ok(dev)) |
| 4711 | flags |= IFF_LOWER_UP; |
| 4712 | if (netif_dormant(dev)) |
| 4713 | flags |= IFF_DORMANT; |
| 4714 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4715 | |
| 4716 | return flags; |
| 4717 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4718 | EXPORT_SYMBOL(dev_get_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4719 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4720 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4721 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4722 | int old_flags = dev->flags; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4723 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4724 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4725 | ASSERT_RTNL(); |
| 4726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4727 | /* |
| 4728 | * Set the flags on our device. |
| 4729 | */ |
| 4730 | |
| 4731 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | |
| 4732 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | |
| 4733 | IFF_AUTOMEDIA)) | |
| 4734 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | |
| 4735 | IFF_ALLMULTI)); |
| 4736 | |
| 4737 | /* |
| 4738 | * Load in the correct multicast list now the flags have changed. |
| 4739 | */ |
| 4740 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4741 | if ((old_flags ^ flags) & IFF_MULTICAST) |
| 4742 | dev_change_rx_flags(dev, IFF_MULTICAST); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4743 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4744 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4745 | |
| 4746 | /* |
| 4747 | * Have we downed the interface. We handle IFF_UP ourselves |
| 4748 | * according to user attempts to set it, rather than blindly |
| 4749 | * setting it. |
| 4750 | */ |
| 4751 | |
| 4752 | ret = 0; |
| 4753 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4754 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4755 | |
| 4756 | if (!ret) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4757 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4758 | } |
| 4759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4760 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4761 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
| 4762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4763 | dev->gflags ^= IFF_PROMISC; |
| 4764 | dev_set_promiscuity(dev, inc); |
| 4765 | } |
| 4766 | |
| 4767 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI |
| 4768 | is important. Some (broken) drivers set IFF_PROMISC, when |
| 4769 | IFF_ALLMULTI is requested not asking us and not reporting. |
| 4770 | */ |
| 4771 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4772 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
| 4773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4774 | dev->gflags ^= IFF_ALLMULTI; |
| 4775 | dev_set_allmulti(dev, inc); |
| 4776 | } |
| 4777 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4778 | return ret; |
| 4779 | } |
| 4780 | |
| 4781 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags) |
| 4782 | { |
| 4783 | unsigned int changes = dev->flags ^ old_flags; |
| 4784 | |
| 4785 | if (changes & IFF_UP) { |
| 4786 | if (dev->flags & IFF_UP) |
| 4787 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 4788 | else |
| 4789 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 4790 | } |
| 4791 | |
| 4792 | if (dev->flags & IFF_UP && |
| 4793 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) |
| 4794 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
| 4795 | } |
| 4796 | |
| 4797 | /** |
| 4798 | * dev_change_flags - change device settings |
| 4799 | * @dev: device |
| 4800 | * @flags: device state flags |
| 4801 | * |
| 4802 | * Change settings on device based state flags. The flags are |
| 4803 | * in the userspace exported format. |
| 4804 | */ |
| 4805 | int dev_change_flags(struct net_device *dev, unsigned flags) |
| 4806 | { |
| 4807 | int ret, changes; |
| 4808 | int old_flags = dev->flags; |
| 4809 | |
| 4810 | ret = __dev_change_flags(dev, flags); |
| 4811 | if (ret < 0) |
| 4812 | return ret; |
| 4813 | |
| 4814 | changes = old_flags ^ dev->flags; |
Thomas Graf | 7c355f5 | 2007-06-05 16:03:03 -0700 | [diff] [blame] | 4815 | if (changes) |
| 4816 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4817 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4818 | __dev_notify_flags(dev, old_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4819 | return ret; |
| 4820 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4821 | EXPORT_SYMBOL(dev_change_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4822 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4823 | /** |
| 4824 | * dev_set_mtu - Change maximum transfer unit |
| 4825 | * @dev: device |
| 4826 | * @new_mtu: new transfer unit |
| 4827 | * |
| 4828 | * Change the maximum transfer size of the network device. |
| 4829 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4830 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
| 4831 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4832 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4833 | int err; |
| 4834 | |
| 4835 | if (new_mtu == dev->mtu) |
| 4836 | return 0; |
| 4837 | |
| 4838 | /* MTU must be positive. */ |
| 4839 | if (new_mtu < 0) |
| 4840 | return -EINVAL; |
| 4841 | |
| 4842 | if (!netif_device_present(dev)) |
| 4843 | return -ENODEV; |
| 4844 | |
| 4845 | err = 0; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4846 | if (ops->ndo_change_mtu) |
| 4847 | err = ops->ndo_change_mtu(dev, new_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4848 | else |
| 4849 | dev->mtu = new_mtu; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4851 | if (!err && dev->flags & IFF_UP) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4852 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4853 | return err; |
| 4854 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4855 | EXPORT_SYMBOL(dev_set_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4856 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4857 | /** |
Vlad Dogaru | cbda10f | 2011-01-13 23:38:30 +0000 | [diff] [blame] | 4858 | * dev_set_group - Change group this device belongs to |
| 4859 | * @dev: device |
| 4860 | * @new_group: group this device should belong to |
| 4861 | */ |
| 4862 | void dev_set_group(struct net_device *dev, int new_group) |
| 4863 | { |
| 4864 | dev->group = new_group; |
| 4865 | } |
| 4866 | EXPORT_SYMBOL(dev_set_group); |
| 4867 | |
| 4868 | /** |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4869 | * dev_set_mac_address - Change Media Access Control Address |
| 4870 | * @dev: device |
| 4871 | * @sa: new address |
| 4872 | * |
| 4873 | * Change the hardware (MAC) address of the device |
| 4874 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4875 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
| 4876 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4877 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4878 | int err; |
| 4879 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4880 | if (!ops->ndo_set_mac_address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4881 | return -EOPNOTSUPP; |
| 4882 | if (sa->sa_family != dev->type) |
| 4883 | return -EINVAL; |
| 4884 | if (!netif_device_present(dev)) |
| 4885 | return -ENODEV; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4886 | err = ops->ndo_set_mac_address(dev, sa); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4887 | if (!err) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4888 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4889 | return err; |
| 4890 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4891 | EXPORT_SYMBOL(dev_set_mac_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4892 | |
| 4893 | /* |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4894 | * Perform the SIOCxIFxxx calls, inside rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4895 | */ |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4896 | static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4897 | { |
| 4898 | int err; |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4899 | struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4900 | |
| 4901 | if (!dev) |
| 4902 | return -ENODEV; |
| 4903 | |
| 4904 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4905 | case SIOCGIFFLAGS: /* Get interface flags */ |
| 4906 | ifr->ifr_flags = (short) dev_get_flags(dev); |
| 4907 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4908 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4909 | case SIOCGIFMETRIC: /* Get the metric on the interface |
| 4910 | (currently unused) */ |
| 4911 | ifr->ifr_metric = 0; |
| 4912 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4913 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4914 | case SIOCGIFMTU: /* Get the MTU of a device */ |
| 4915 | ifr->ifr_mtu = dev->mtu; |
| 4916 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4917 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4918 | case SIOCGIFHWADDR: |
| 4919 | if (!dev->addr_len) |
| 4920 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); |
| 4921 | else |
| 4922 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, |
| 4923 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4924 | ifr->ifr_hwaddr.sa_family = dev->type; |
| 4925 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4926 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4927 | case SIOCGIFSLAVE: |
| 4928 | err = -EINVAL; |
| 4929 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4930 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4931 | case SIOCGIFMAP: |
| 4932 | ifr->ifr_map.mem_start = dev->mem_start; |
| 4933 | ifr->ifr_map.mem_end = dev->mem_end; |
| 4934 | ifr->ifr_map.base_addr = dev->base_addr; |
| 4935 | ifr->ifr_map.irq = dev->irq; |
| 4936 | ifr->ifr_map.dma = dev->dma; |
| 4937 | ifr->ifr_map.port = dev->if_port; |
| 4938 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4939 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4940 | case SIOCGIFINDEX: |
| 4941 | ifr->ifr_ifindex = dev->ifindex; |
| 4942 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4943 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4944 | case SIOCGIFTXQLEN: |
| 4945 | ifr->ifr_qlen = dev->tx_queue_len; |
| 4946 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4947 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4948 | default: |
| 4949 | /* dev_ioctl() should ensure this case |
| 4950 | * is never reached |
| 4951 | */ |
| 4952 | WARN_ON(1); |
Lifeng Sun | 41c31f3 | 2011-04-27 22:04:51 +0000 | [diff] [blame] | 4953 | err = -ENOTTY; |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4954 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4955 | |
| 4956 | } |
| 4957 | return err; |
| 4958 | } |
| 4959 | |
| 4960 | /* |
| 4961 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() |
| 4962 | */ |
| 4963 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) |
| 4964 | { |
| 4965 | int err; |
| 4966 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4967 | const struct net_device_ops *ops; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4968 | |
| 4969 | if (!dev) |
| 4970 | return -ENODEV; |
| 4971 | |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4972 | ops = dev->netdev_ops; |
| 4973 | |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4974 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4975 | case SIOCSIFFLAGS: /* Set interface flags */ |
| 4976 | return dev_change_flags(dev, ifr->ifr_flags); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4977 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4978 | case SIOCSIFMETRIC: /* Set the metric on the interface |
| 4979 | (currently unused) */ |
| 4980 | return -EOPNOTSUPP; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4981 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4982 | case SIOCSIFMTU: /* Set the MTU of a device */ |
| 4983 | return dev_set_mtu(dev, ifr->ifr_mtu); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4984 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4985 | case SIOCSIFHWADDR: |
| 4986 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4987 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4988 | case SIOCSIFHWBROADCAST: |
| 4989 | if (ifr->ifr_hwaddr.sa_family != dev->type) |
| 4990 | return -EINVAL; |
| 4991 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, |
| 4992 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4993 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 4994 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4995 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4996 | case SIOCSIFMAP: |
| 4997 | if (ops->ndo_set_config) { |
| 4998 | if (!netif_device_present(dev)) |
| 4999 | return -ENODEV; |
| 5000 | return ops->ndo_set_config(dev, &ifr->ifr_map); |
| 5001 | } |
| 5002 | return -EOPNOTSUPP; |
| 5003 | |
| 5004 | case SIOCADDMULTI: |
Jiri Pirko | b81693d | 2011-08-16 06:29:02 +0000 | [diff] [blame] | 5005 | if (!ops->ndo_set_rx_mode || |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5006 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 5007 | return -EINVAL; |
| 5008 | if (!netif_device_present(dev)) |
| 5009 | return -ENODEV; |
Jiri Pirko | 22bedad | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5010 | return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5011 | |
| 5012 | case SIOCDELMULTI: |
Jiri Pirko | b81693d | 2011-08-16 06:29:02 +0000 | [diff] [blame] | 5013 | if (!ops->ndo_set_rx_mode || |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5014 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 5015 | return -EINVAL; |
| 5016 | if (!netif_device_present(dev)) |
| 5017 | return -ENODEV; |
Jiri Pirko | 22bedad | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5018 | return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5019 | |
| 5020 | case SIOCSIFTXQLEN: |
| 5021 | if (ifr->ifr_qlen < 0) |
| 5022 | return -EINVAL; |
| 5023 | dev->tx_queue_len = ifr->ifr_qlen; |
| 5024 | return 0; |
| 5025 | |
| 5026 | case SIOCSIFNAME: |
| 5027 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; |
| 5028 | return dev_change_name(dev, ifr->ifr_newname); |
| 5029 | |
Richard Cochran | 4dc360c | 2011-10-19 17:00:35 -0400 | [diff] [blame] | 5030 | case SIOCSHWTSTAMP: |
| 5031 | err = net_hwtstamp_validate(ifr); |
| 5032 | if (err) |
| 5033 | return err; |
| 5034 | /* fall through */ |
| 5035 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5036 | /* |
| 5037 | * Unknown or private ioctl |
| 5038 | */ |
| 5039 | default: |
| 5040 | if ((cmd >= SIOCDEVPRIVATE && |
| 5041 | cmd <= SIOCDEVPRIVATE + 15) || |
| 5042 | cmd == SIOCBONDENSLAVE || |
| 5043 | cmd == SIOCBONDRELEASE || |
| 5044 | cmd == SIOCBONDSETHWADDR || |
| 5045 | cmd == SIOCBONDSLAVEINFOQUERY || |
| 5046 | cmd == SIOCBONDINFOQUERY || |
| 5047 | cmd == SIOCBONDCHANGEACTIVE || |
| 5048 | cmd == SIOCGMIIPHY || |
| 5049 | cmd == SIOCGMIIREG || |
| 5050 | cmd == SIOCSMIIREG || |
| 5051 | cmd == SIOCBRADDIF || |
| 5052 | cmd == SIOCBRDELIF || |
| 5053 | cmd == SIOCSHWTSTAMP || |
| 5054 | cmd == SIOCWANDEV) { |
| 5055 | err = -EOPNOTSUPP; |
| 5056 | if (ops->ndo_do_ioctl) { |
| 5057 | if (netif_device_present(dev)) |
| 5058 | err = ops->ndo_do_ioctl(dev, ifr, cmd); |
| 5059 | else |
| 5060 | err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5061 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5062 | } else |
| 5063 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5064 | |
| 5065 | } |
| 5066 | return err; |
| 5067 | } |
| 5068 | |
| 5069 | /* |
| 5070 | * This function handles all "interface"-type I/O control requests. The actual |
| 5071 | * 'doing' part of this is dev_ifsioc above. |
| 5072 | */ |
| 5073 | |
| 5074 | /** |
| 5075 | * dev_ioctl - network device ioctl |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 5076 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5077 | * @cmd: command to issue |
| 5078 | * @arg: pointer to a struct ifreq in user space |
| 5079 | * |
| 5080 | * Issue ioctl functions to devices. This is normally called by the |
| 5081 | * user space syscall interfaces but can sometimes be useful for |
| 5082 | * other purposes. The return value is the return from the syscall if |
| 5083 | * positive or a negative errno code on error. |
| 5084 | */ |
| 5085 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5086 | int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5087 | { |
| 5088 | struct ifreq ifr; |
| 5089 | int ret; |
| 5090 | char *colon; |
| 5091 | |
| 5092 | /* One special case: SIOCGIFCONF takes ifconf argument |
| 5093 | and requires shared lock, because it sleeps writing |
| 5094 | to user space. |
| 5095 | */ |
| 5096 | |
| 5097 | if (cmd == SIOCGIFCONF) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5098 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5099 | ret = dev_ifconf(net, (char __user *) arg); |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5100 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5101 | return ret; |
| 5102 | } |
| 5103 | if (cmd == SIOCGIFNAME) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5104 | return dev_ifname(net, (struct ifreq __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5105 | |
| 5106 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 5107 | return -EFAULT; |
| 5108 | |
| 5109 | ifr.ifr_name[IFNAMSIZ-1] = 0; |
| 5110 | |
| 5111 | colon = strchr(ifr.ifr_name, ':'); |
| 5112 | if (colon) |
| 5113 | *colon = 0; |
| 5114 | |
| 5115 | /* |
| 5116 | * See which interface the caller is talking about. |
| 5117 | */ |
| 5118 | |
| 5119 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5120 | /* |
| 5121 | * These ioctl calls: |
| 5122 | * - can be done by all. |
| 5123 | * - atomic and do not require locking. |
| 5124 | * - return a value |
| 5125 | */ |
| 5126 | case SIOCGIFFLAGS: |
| 5127 | case SIOCGIFMETRIC: |
| 5128 | case SIOCGIFMTU: |
| 5129 | case SIOCGIFHWADDR: |
| 5130 | case SIOCGIFSLAVE: |
| 5131 | case SIOCGIFMAP: |
| 5132 | case SIOCGIFINDEX: |
| 5133 | case SIOCGIFTXQLEN: |
| 5134 | dev_load(net, ifr.ifr_name); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 5135 | rcu_read_lock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5136 | ret = dev_ifsioc_locked(net, &ifr, cmd); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 5137 | rcu_read_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5138 | if (!ret) { |
| 5139 | if (colon) |
| 5140 | *colon = ':'; |
| 5141 | if (copy_to_user(arg, &ifr, |
| 5142 | sizeof(struct ifreq))) |
| 5143 | ret = -EFAULT; |
| 5144 | } |
| 5145 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5146 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5147 | case SIOCETHTOOL: |
| 5148 | dev_load(net, ifr.ifr_name); |
| 5149 | rtnl_lock(); |
| 5150 | ret = dev_ethtool(net, &ifr); |
| 5151 | rtnl_unlock(); |
| 5152 | if (!ret) { |
| 5153 | if (colon) |
| 5154 | *colon = ':'; |
| 5155 | if (copy_to_user(arg, &ifr, |
| 5156 | sizeof(struct ifreq))) |
| 5157 | ret = -EFAULT; |
| 5158 | } |
| 5159 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5160 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5161 | /* |
| 5162 | * These ioctl calls: |
| 5163 | * - require superuser power. |
| 5164 | * - require strict serialization. |
| 5165 | * - return a value |
| 5166 | */ |
| 5167 | case SIOCGMIIPHY: |
| 5168 | case SIOCGMIIREG: |
| 5169 | case SIOCSIFNAME: |
| 5170 | if (!capable(CAP_NET_ADMIN)) |
| 5171 | return -EPERM; |
| 5172 | dev_load(net, ifr.ifr_name); |
| 5173 | rtnl_lock(); |
| 5174 | ret = dev_ifsioc(net, &ifr, cmd); |
| 5175 | rtnl_unlock(); |
| 5176 | if (!ret) { |
| 5177 | if (colon) |
| 5178 | *colon = ':'; |
| 5179 | if (copy_to_user(arg, &ifr, |
| 5180 | sizeof(struct ifreq))) |
| 5181 | ret = -EFAULT; |
| 5182 | } |
| 5183 | return ret; |
| 5184 | |
| 5185 | /* |
| 5186 | * These ioctl calls: |
| 5187 | * - require superuser power. |
| 5188 | * - require strict serialization. |
| 5189 | * - do not return a value |
| 5190 | */ |
| 5191 | case SIOCSIFFLAGS: |
| 5192 | case SIOCSIFMETRIC: |
| 5193 | case SIOCSIFMTU: |
| 5194 | case SIOCSIFMAP: |
| 5195 | case SIOCSIFHWADDR: |
| 5196 | case SIOCSIFSLAVE: |
| 5197 | case SIOCADDMULTI: |
| 5198 | case SIOCDELMULTI: |
| 5199 | case SIOCSIFHWBROADCAST: |
| 5200 | case SIOCSIFTXQLEN: |
| 5201 | case SIOCSMIIREG: |
| 5202 | case SIOCBONDENSLAVE: |
| 5203 | case SIOCBONDRELEASE: |
| 5204 | case SIOCBONDSETHWADDR: |
| 5205 | case SIOCBONDCHANGEACTIVE: |
| 5206 | case SIOCBRADDIF: |
| 5207 | case SIOCBRDELIF: |
| 5208 | case SIOCSHWTSTAMP: |
| 5209 | if (!capable(CAP_NET_ADMIN)) |
| 5210 | return -EPERM; |
| 5211 | /* fall through */ |
| 5212 | case SIOCBONDSLAVEINFOQUERY: |
| 5213 | case SIOCBONDINFOQUERY: |
| 5214 | dev_load(net, ifr.ifr_name); |
| 5215 | rtnl_lock(); |
| 5216 | ret = dev_ifsioc(net, &ifr, cmd); |
| 5217 | rtnl_unlock(); |
| 5218 | return ret; |
| 5219 | |
| 5220 | case SIOCGIFMEM: |
| 5221 | /* Get the per device memory space. We can add this but |
| 5222 | * currently do not support it */ |
| 5223 | case SIOCSIFMEM: |
| 5224 | /* Set the per device memory buffer space. |
| 5225 | * Not applicable in our case */ |
| 5226 | case SIOCSIFLINK: |
Lifeng Sun | 41c31f3 | 2011-04-27 22:04:51 +0000 | [diff] [blame] | 5227 | return -ENOTTY; |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5228 | |
| 5229 | /* |
| 5230 | * Unknown or private ioctl. |
| 5231 | */ |
| 5232 | default: |
| 5233 | if (cmd == SIOCWANDEV || |
| 5234 | (cmd >= SIOCDEVPRIVATE && |
| 5235 | cmd <= SIOCDEVPRIVATE + 15)) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5236 | dev_load(net, ifr.ifr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5237 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5238 | ret = dev_ifsioc(net, &ifr, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5239 | rtnl_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5240 | if (!ret && copy_to_user(arg, &ifr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5241 | sizeof(struct ifreq))) |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5242 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5243 | return ret; |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5244 | } |
| 5245 | /* Take care of Wireless Extensions */ |
| 5246 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) |
| 5247 | return wext_handle_ioctl(net, &ifr, cmd, arg); |
Lifeng Sun | 41c31f3 | 2011-04-27 22:04:51 +0000 | [diff] [blame] | 5248 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5249 | } |
| 5250 | } |
| 5251 | |
| 5252 | |
| 5253 | /** |
| 5254 | * dev_new_index - allocate an ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 5255 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5256 | * |
| 5257 | * Returns a suitable unique value for a new device interface |
| 5258 | * number. The caller must hold the rtnl semaphore or the |
| 5259 | * dev_base_lock to be sure it remains unique. |
| 5260 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5261 | static int dev_new_index(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5262 | { |
| 5263 | static int ifindex; |
| 5264 | for (;;) { |
| 5265 | if (++ifindex <= 0) |
| 5266 | ifindex = 1; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5267 | if (!__dev_get_by_index(net, ifindex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5268 | return ifindex; |
| 5269 | } |
| 5270 | } |
| 5271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5272 | /* Delayed registration/unregisteration */ |
Denis Cheng | 3b5b34f | 2007-12-07 00:49:17 -0800 | [diff] [blame] | 5273 | static LIST_HEAD(net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5274 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 5275 | static void net_set_todo(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5276 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5277 | list_add_tail(&dev->todo_list, &net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5278 | } |
| 5279 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5280 | static void rollback_registered_many(struct list_head *head) |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5281 | { |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5282 | struct net_device *dev, *tmp; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5283 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5284 | BUG_ON(dev_boot_phase); |
| 5285 | ASSERT_RTNL(); |
| 5286 | |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5287 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5288 | /* Some devices call without registering |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5289 | * for initialization unwind. Remove those |
| 5290 | * devices and proceed with the remaining. |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5291 | */ |
| 5292 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 5293 | pr_debug("unregister_netdevice: device %s/%p never " |
| 5294 | "was registered\n", dev->name, dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5295 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5296 | WARN_ON(1); |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 5297 | list_del(&dev->unreg_list); |
| 5298 | continue; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5299 | } |
Eric Dumazet | 449f454 | 2011-05-19 12:24:16 +0000 | [diff] [blame] | 5300 | dev->dismantle = true; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5301 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 5302 | } |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5303 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 5304 | /* If device is running, close it first. */ |
| 5305 | dev_close_many(head); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5306 | |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 5307 | list_for_each_entry(dev, head, unreg_list) { |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5308 | /* And unlink it from device chain. */ |
| 5309 | unlist_netdevice(dev); |
| 5310 | |
| 5311 | dev->reg_state = NETREG_UNREGISTERING; |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5312 | } |
| 5313 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5314 | synchronize_net(); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5315 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5316 | list_for_each_entry(dev, head, unreg_list) { |
| 5317 | /* Shutdown queueing discipline. */ |
| 5318 | dev_shutdown(dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5319 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5320 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5321 | /* Notify protocols, that we are about to destroy |
| 5322 | this device. They should clean all the things. |
| 5323 | */ |
| 5324 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
| 5325 | |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 5326 | if (!dev->rtnl_link_ops || |
| 5327 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 5328 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); |
| 5329 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5330 | /* |
| 5331 | * Flush the unicast and multicast chains |
| 5332 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 5333 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5334 | dev_mc_flush(dev); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5335 | |
| 5336 | if (dev->netdev_ops->ndo_uninit) |
| 5337 | dev->netdev_ops->ndo_uninit(dev); |
| 5338 | |
| 5339 | /* Notifier chain MUST detach us from master device. */ |
| 5340 | WARN_ON(dev->master); |
| 5341 | |
| 5342 | /* Remove entries from kobject tree */ |
| 5343 | netdev_unregister_kobject(dev); |
| 5344 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5345 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5346 | /* Process any work delayed until the end of the batch */ |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 5347 | dev = list_first_entry(head, struct net_device, unreg_list); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5348 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
| 5349 | |
Eric W. Biederman | 850a545 | 2011-10-13 22:25:23 +0000 | [diff] [blame] | 5350 | synchronize_net(); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5351 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5352 | list_for_each_entry(dev, head, unreg_list) |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5353 | dev_put(dev); |
| 5354 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5355 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5356 | static void rollback_registered(struct net_device *dev) |
| 5357 | { |
| 5358 | LIST_HEAD(single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5359 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5360 | list_add(&dev->unreg_list, &single); |
| 5361 | rollback_registered_many(&single); |
Eric Dumazet | ceaaec9 | 2011-02-17 22:59:19 +0000 | [diff] [blame] | 5362 | list_del(&single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5363 | } |
| 5364 | |
Michał Mirosław | fec30c3 | 2011-07-13 14:10:30 +0000 | [diff] [blame] | 5365 | static u32 netdev_fix_features(struct net_device *dev, u32 features) |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5366 | { |
Michał Mirosław | 57422dc | 2011-01-22 12:14:12 +0000 | [diff] [blame] | 5367 | /* Fix illegal checksum combinations */ |
| 5368 | if ((features & NETIF_F_HW_CSUM) && |
| 5369 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5370 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
Michał Mirosław | 57422dc | 2011-01-22 12:14:12 +0000 | [diff] [blame] | 5371 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
| 5372 | } |
| 5373 | |
| 5374 | if ((features & NETIF_F_NO_CSUM) && |
| 5375 | (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5376 | netdev_warn(dev, "mixed no checksumming and other settings.\n"); |
Michał Mirosław | 57422dc | 2011-01-22 12:14:12 +0000 | [diff] [blame] | 5377 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); |
| 5378 | } |
| 5379 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5380 | /* Fix illegal SG+CSUM combinations. */ |
| 5381 | if ((features & NETIF_F_SG) && |
| 5382 | !(features & NETIF_F_ALL_CSUM)) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5383 | netdev_dbg(dev, |
| 5384 | "Dropping NETIF_F_SG since no checksum feature.\n"); |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5385 | features &= ~NETIF_F_SG; |
| 5386 | } |
| 5387 | |
| 5388 | /* TSO requires that SG is present as well. */ |
Ben Hutchings | ea2d368 | 2011-04-12 14:38:37 +0000 | [diff] [blame] | 5389 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5390 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
Ben Hutchings | ea2d368 | 2011-04-12 14:38:37 +0000 | [diff] [blame] | 5391 | features &= ~NETIF_F_ALL_TSO; |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5392 | } |
| 5393 | |
Ben Hutchings | 31d8b9e | 2011-04-12 14:47:15 +0000 | [diff] [blame] | 5394 | /* TSO ECN requires that TSO is present as well. */ |
| 5395 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) |
| 5396 | features &= ~NETIF_F_TSO_ECN; |
| 5397 | |
Michał Mirosław | 212b573 | 2011-02-15 16:59:16 +0000 | [diff] [blame] | 5398 | /* Software GSO depends on SG. */ |
| 5399 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5400 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
Michał Mirosław | 212b573 | 2011-02-15 16:59:16 +0000 | [diff] [blame] | 5401 | features &= ~NETIF_F_GSO; |
| 5402 | } |
| 5403 | |
Michał Mirosław | acd1130 | 2011-01-24 15:45:15 -0800 | [diff] [blame] | 5404 | /* UFO needs SG and checksumming */ |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5405 | if (features & NETIF_F_UFO) { |
Michał Mirosław | 7903264 | 2010-11-30 06:38:00 +0000 | [diff] [blame] | 5406 | /* maybe split UFO into V4 and V6? */ |
| 5407 | if (!((features & NETIF_F_GEN_CSUM) || |
| 5408 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) |
| 5409 | == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5410 | netdev_dbg(dev, |
Michał Mirosław | acd1130 | 2011-01-24 15:45:15 -0800 | [diff] [blame] | 5411 | "Dropping NETIF_F_UFO since no checksum offload features.\n"); |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5412 | features &= ~NETIF_F_UFO; |
| 5413 | } |
| 5414 | |
| 5415 | if (!(features & NETIF_F_SG)) { |
Michał Mirosław | 6f404e4 | 2011-05-16 15:14:21 -0400 | [diff] [blame] | 5416 | netdev_dbg(dev, |
Michał Mirosław | acd1130 | 2011-01-24 15:45:15 -0800 | [diff] [blame] | 5417 | "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n"); |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5418 | features &= ~NETIF_F_UFO; |
| 5419 | } |
| 5420 | } |
| 5421 | |
| 5422 | return features; |
| 5423 | } |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5424 | |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5425 | int __netdev_update_features(struct net_device *dev) |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5426 | { |
| 5427 | u32 features; |
| 5428 | int err = 0; |
| 5429 | |
Michał Mirosław | 8726748 | 2011-04-12 09:56:38 +0000 | [diff] [blame] | 5430 | ASSERT_RTNL(); |
| 5431 | |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5432 | features = netdev_get_wanted_features(dev); |
| 5433 | |
| 5434 | if (dev->netdev_ops->ndo_fix_features) |
| 5435 | features = dev->netdev_ops->ndo_fix_features(dev, features); |
| 5436 | |
| 5437 | /* driver might be less strict about feature dependencies */ |
| 5438 | features = netdev_fix_features(dev, features); |
| 5439 | |
| 5440 | if (dev->features == features) |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5441 | return 0; |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5442 | |
Michael S. Tsirkin | 604ae14 | 2011-05-16 10:37:39 +0000 | [diff] [blame] | 5443 | netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n", |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5444 | dev->features, features); |
| 5445 | |
| 5446 | if (dev->netdev_ops->ndo_set_features) |
| 5447 | err = dev->netdev_ops->ndo_set_features(dev, features); |
| 5448 | |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5449 | if (unlikely(err < 0)) { |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5450 | netdev_err(dev, |
| 5451 | "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n", |
| 5452 | err, features, dev->features); |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5453 | return -1; |
| 5454 | } |
| 5455 | |
| 5456 | if (!err) |
| 5457 | dev->features = features; |
| 5458 | |
| 5459 | return 1; |
| 5460 | } |
| 5461 | |
Michał Mirosław | afe12cc | 2011-05-07 03:22:17 +0000 | [diff] [blame] | 5462 | /** |
| 5463 | * netdev_update_features - recalculate device features |
| 5464 | * @dev: the device to check |
| 5465 | * |
| 5466 | * Recalculate dev->features set and send notifications if it |
| 5467 | * has changed. Should be called after driver or hardware dependent |
| 5468 | * conditions might have changed that influence the features. |
| 5469 | */ |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5470 | void netdev_update_features(struct net_device *dev) |
| 5471 | { |
| 5472 | if (__netdev_update_features(dev)) |
| 5473 | netdev_features_change(dev); |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5474 | } |
| 5475 | EXPORT_SYMBOL(netdev_update_features); |
| 5476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5477 | /** |
Michał Mirosław | afe12cc | 2011-05-07 03:22:17 +0000 | [diff] [blame] | 5478 | * netdev_change_features - recalculate device features |
| 5479 | * @dev: the device to check |
| 5480 | * |
| 5481 | * Recalculate dev->features set and send notifications even |
| 5482 | * if they have not changed. Should be called instead of |
| 5483 | * netdev_update_features() if also dev->vlan_features might |
| 5484 | * have changed to allow the changes to be propagated to stacked |
| 5485 | * VLAN devices. |
| 5486 | */ |
| 5487 | void netdev_change_features(struct net_device *dev) |
| 5488 | { |
| 5489 | __netdev_update_features(dev); |
| 5490 | netdev_features_change(dev); |
| 5491 | } |
| 5492 | EXPORT_SYMBOL(netdev_change_features); |
| 5493 | |
| 5494 | /** |
Patrick Mullaney | fc4a748 | 2009-12-03 15:59:22 -0800 | [diff] [blame] | 5495 | * netif_stacked_transfer_operstate - transfer operstate |
| 5496 | * @rootdev: the root or lower level device to transfer state from |
| 5497 | * @dev: the device to transfer operstate to |
| 5498 | * |
| 5499 | * Transfer operational state from root to device. This is normally |
| 5500 | * called when a stacking relationship exists between the root |
| 5501 | * device and the device(a leaf device). |
| 5502 | */ |
| 5503 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, |
| 5504 | struct net_device *dev) |
| 5505 | { |
| 5506 | if (rootdev->operstate == IF_OPER_DORMANT) |
| 5507 | netif_dormant_on(dev); |
| 5508 | else |
| 5509 | netif_dormant_off(dev); |
| 5510 | |
| 5511 | if (netif_carrier_ok(rootdev)) { |
| 5512 | if (!netif_carrier_ok(dev)) |
| 5513 | netif_carrier_on(dev); |
| 5514 | } else { |
| 5515 | if (netif_carrier_ok(dev)) |
| 5516 | netif_carrier_off(dev); |
| 5517 | } |
| 5518 | } |
| 5519 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); |
| 5520 | |
Tom Herbert | bf26414 | 2010-11-26 08:36:09 +0000 | [diff] [blame] | 5521 | #ifdef CONFIG_RPS |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5522 | static int netif_alloc_rx_queues(struct net_device *dev) |
| 5523 | { |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5524 | unsigned int i, count = dev->num_rx_queues; |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5525 | struct netdev_rx_queue *rx; |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5526 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5527 | BUG_ON(count < 1); |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5528 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5529 | rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
| 5530 | if (!rx) { |
| 5531 | pr_err("netdev: Unable to allocate %u rx queues.\n", count); |
| 5532 | return -ENOMEM; |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5533 | } |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5534 | dev->_rx = rx; |
| 5535 | |
Tom Herbert | bd25fa7 | 2010-10-18 18:00:16 +0000 | [diff] [blame] | 5536 | for (i = 0; i < count; i++) |
Tom Herbert | fe82224 | 2010-11-09 10:47:38 +0000 | [diff] [blame] | 5537 | rx[i].dev = dev; |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5538 | return 0; |
| 5539 | } |
Tom Herbert | bf26414 | 2010-11-26 08:36:09 +0000 | [diff] [blame] | 5540 | #endif |
Eric Dumazet | 1b4bf46 | 2010-09-23 17:26:35 +0000 | [diff] [blame] | 5541 | |
Changli Gao | aa94210 | 2010-12-04 02:31:41 +0000 | [diff] [blame] | 5542 | static void netdev_init_one_queue(struct net_device *dev, |
| 5543 | struct netdev_queue *queue, void *_unused) |
| 5544 | { |
| 5545 | /* Initialize queue lock */ |
| 5546 | spin_lock_init(&queue->_xmit_lock); |
| 5547 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); |
| 5548 | queue->xmit_lock_owner = -1; |
Changli Gao | b236da6 | 2010-12-14 03:09:15 +0000 | [diff] [blame] | 5549 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
Changli Gao | aa94210 | 2010-12-04 02:31:41 +0000 | [diff] [blame] | 5550 | queue->dev = dev; |
| 5551 | } |
| 5552 | |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5553 | static int netif_alloc_netdev_queues(struct net_device *dev) |
| 5554 | { |
| 5555 | unsigned int count = dev->num_tx_queues; |
| 5556 | struct netdev_queue *tx; |
| 5557 | |
| 5558 | BUG_ON(count < 1); |
| 5559 | |
| 5560 | tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL); |
| 5561 | if (!tx) { |
| 5562 | pr_err("netdev: Unable to allocate %u tx queues.\n", |
| 5563 | count); |
| 5564 | return -ENOMEM; |
| 5565 | } |
| 5566 | dev->_tx = tx; |
Tom Herbert | 1d24eb4 | 2010-11-21 13:17:27 +0000 | [diff] [blame] | 5567 | |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5568 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
| 5569 | spin_lock_init(&dev->tx_global_lock); |
Changli Gao | aa94210 | 2010-12-04 02:31:41 +0000 | [diff] [blame] | 5570 | |
| 5571 | return 0; |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 5572 | } |
| 5573 | |
Patrick Mullaney | fc4a748 | 2009-12-03 15:59:22 -0800 | [diff] [blame] | 5574 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5575 | * register_netdevice - register a network device |
| 5576 | * @dev: device to register |
| 5577 | * |
| 5578 | * Take a completed network device structure and add it to the kernel |
| 5579 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 5580 | * chain. 0 is returned on success. A negative errno code is returned |
| 5581 | * on a failure to set up the device, or if the name is a duplicate. |
| 5582 | * |
| 5583 | * Callers must hold the rtnl semaphore. You may want |
| 5584 | * register_netdev() instead of this. |
| 5585 | * |
| 5586 | * BUGS: |
| 5587 | * The locking appears insufficient to guarantee two parallel registers |
| 5588 | * will not get the same name. |
| 5589 | */ |
| 5590 | |
| 5591 | int register_netdevice(struct net_device *dev) |
| 5592 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5593 | int ret; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5594 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5595 | |
| 5596 | BUG_ON(dev_boot_phase); |
| 5597 | ASSERT_RTNL(); |
| 5598 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5599 | might_sleep(); |
| 5600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5601 | /* When net_device's are persistent, this will be fatal. */ |
| 5602 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5603 | BUG_ON(!net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5604 | |
David S. Miller | f1f28aa | 2008-07-15 00:08:33 -0700 | [diff] [blame] | 5605 | spin_lock_init(&dev->addr_list_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 5606 | netdev_set_addr_lockdep_class(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5608 | dev->iflink = -1; |
| 5609 | |
Peter Pan(潘卫平) | 0696c3a | 2011-05-12 15:46:56 +0000 | [diff] [blame] | 5610 | ret = dev_get_valid_name(dev, dev->name); |
| 5611 | if (ret < 0) |
| 5612 | goto out; |
| 5613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5614 | /* Init, if this function is available */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5615 | if (dev->netdev_ops->ndo_init) { |
| 5616 | ret = dev->netdev_ops->ndo_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5617 | if (ret) { |
| 5618 | if (ret > 0) |
| 5619 | ret = -EIO; |
Adrian Bunk | 90833aa | 2006-11-13 16:02:22 -0800 | [diff] [blame] | 5620 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5621 | } |
| 5622 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5623 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5624 | dev->ifindex = dev_new_index(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5625 | if (dev->iflink == -1) |
| 5626 | dev->iflink = dev->ifindex; |
| 5627 | |
Michał Mirosław | 5455c69 | 2011-02-15 16:59:17 +0000 | [diff] [blame] | 5628 | /* Transfer changeable features to wanted_features and enable |
| 5629 | * software offloads (GSO and GRO). |
| 5630 | */ |
| 5631 | dev->hw_features |= NETIF_F_SOFT_FEATURES; |
Michał Mirosław | 14d1232 | 2011-02-22 16:52:28 +0000 | [diff] [blame] | 5632 | dev->features |= NETIF_F_SOFT_FEATURES; |
| 5633 | dev->wanted_features = dev->features & dev->hw_features; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5634 | |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 5635 | /* Turn on no cache copy if HW is doing checksum */ |
| 5636 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
| 5637 | if ((dev->features & NETIF_F_ALL_CSUM) && |
| 5638 | !(dev->features & NETIF_F_NO_CSUM)) { |
| 5639 | dev->wanted_features |= NETIF_F_NOCACHE_COPY; |
| 5640 | dev->features |= NETIF_F_NOCACHE_COPY; |
| 5641 | } |
| 5642 | |
Michał Mirosław | 1180e7d | 2011-07-14 14:41:11 -0700 | [diff] [blame] | 5643 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
Brandon Philips | 16c3ea7 | 2010-09-15 09:24:24 +0000 | [diff] [blame] | 5644 | */ |
Michał Mirosław | 1180e7d | 2011-07-14 14:41:11 -0700 | [diff] [blame] | 5645 | dev->vlan_features |= NETIF_F_HIGHDMA; |
Brandon Philips | 16c3ea7 | 2010-09-15 09:24:24 +0000 | [diff] [blame] | 5646 | |
Johannes Berg | 7ffbe3f | 2009-10-02 05:15:27 +0000 | [diff] [blame] | 5647 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
| 5648 | ret = notifier_to_errno(ret); |
| 5649 | if (ret) |
| 5650 | goto err_uninit; |
| 5651 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5652 | ret = netdev_register_kobject(dev); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5653 | if (ret) |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5654 | goto err_uninit; |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5655 | dev->reg_state = NETREG_REGISTERED; |
| 5656 | |
Michał Mirosław | 6cb6a27 | 2011-04-02 22:48:47 -0700 | [diff] [blame] | 5657 | __netdev_update_features(dev); |
Michał Mirosław | 8e9b59b | 2011-02-22 16:52:28 +0000 | [diff] [blame] | 5658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5659 | /* |
| 5660 | * Default initial state at registry is that the |
| 5661 | * device is present. |
| 5662 | */ |
| 5663 | |
| 5664 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5666 | dev_init_scheduler(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5667 | dev_hold(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5668 | list_netdevice(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5669 | |
| 5670 | /* Notify protocols, that a new device appeared. */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5671 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 5672 | ret = notifier_to_errno(ret); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5673 | if (ret) { |
| 5674 | rollback_registered(dev); |
| 5675 | dev->reg_state = NETREG_UNREGISTERED; |
| 5676 | } |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 5677 | /* |
| 5678 | * Prevent userspace races by waiting until the network |
| 5679 | * device is fully setup before sending notifications. |
| 5680 | */ |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 5681 | if (!dev->rtnl_link_ops || |
| 5682 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 5683 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5684 | |
| 5685 | out: |
| 5686 | return ret; |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5687 | |
| 5688 | err_uninit: |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5689 | if (dev->netdev_ops->ndo_uninit) |
| 5690 | dev->netdev_ops->ndo_uninit(dev); |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5691 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5692 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5693 | EXPORT_SYMBOL(register_netdevice); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5694 | |
| 5695 | /** |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 5696 | * init_dummy_netdev - init a dummy network device for NAPI |
| 5697 | * @dev: device to init |
| 5698 | * |
| 5699 | * This takes a network device structure and initialize the minimum |
| 5700 | * amount of fields so it can be used to schedule NAPI polls without |
| 5701 | * registering a full blown interface. This is to be used by drivers |
| 5702 | * that need to tie several hardware interfaces to a single NAPI |
| 5703 | * poll scheduler due to HW limitations. |
| 5704 | */ |
| 5705 | int init_dummy_netdev(struct net_device *dev) |
| 5706 | { |
| 5707 | /* Clear everything. Note we don't initialize spinlocks |
| 5708 | * are they aren't supposed to be taken by any of the |
| 5709 | * NAPI code and this dummy netdev is supposed to be |
| 5710 | * only ever used for NAPI polls |
| 5711 | */ |
| 5712 | memset(dev, 0, sizeof(struct net_device)); |
| 5713 | |
| 5714 | /* make sure we BUG if trying to hit standard |
| 5715 | * register/unregister code path |
| 5716 | */ |
| 5717 | dev->reg_state = NETREG_DUMMY; |
| 5718 | |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 5719 | /* NAPI wants this */ |
| 5720 | INIT_LIST_HEAD(&dev->napi_list); |
| 5721 | |
| 5722 | /* a dummy interface is started by default */ |
| 5723 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5724 | set_bit(__LINK_STATE_START, &dev->state); |
| 5725 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5726 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
| 5727 | * because users of this 'device' dont need to change |
| 5728 | * its refcount. |
| 5729 | */ |
| 5730 | |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 5731 | return 0; |
| 5732 | } |
| 5733 | EXPORT_SYMBOL_GPL(init_dummy_netdev); |
| 5734 | |
| 5735 | |
| 5736 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5737 | * register_netdev - register a network device |
| 5738 | * @dev: device to register |
| 5739 | * |
| 5740 | * Take a completed network device structure and add it to the kernel |
| 5741 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 5742 | * chain. 0 is returned on success. A negative errno code is returned |
| 5743 | * on a failure to set up the device, or if the name is a duplicate. |
| 5744 | * |
Borislav Petkov | 38b4da3 | 2007-04-20 22:14:10 -0700 | [diff] [blame] | 5745 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5746 | * and expands the device name if you passed a format string to |
| 5747 | * alloc_netdev. |
| 5748 | */ |
| 5749 | int register_netdev(struct net_device *dev) |
| 5750 | { |
| 5751 | int err; |
| 5752 | |
| 5753 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5754 | err = register_netdevice(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5755 | rtnl_unlock(); |
| 5756 | return err; |
| 5757 | } |
| 5758 | EXPORT_SYMBOL(register_netdev); |
| 5759 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5760 | int netdev_refcnt_read(const struct net_device *dev) |
| 5761 | { |
| 5762 | int i, refcnt = 0; |
| 5763 | |
| 5764 | for_each_possible_cpu(i) |
| 5765 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); |
| 5766 | return refcnt; |
| 5767 | } |
| 5768 | EXPORT_SYMBOL(netdev_refcnt_read); |
| 5769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5770 | /* |
| 5771 | * netdev_wait_allrefs - wait until all references are gone. |
| 5772 | * |
| 5773 | * This is called when unregistering network devices. |
| 5774 | * |
| 5775 | * Any protocol or device that holds a reference should register |
| 5776 | * for netdevice notification, and cleanup and put back the |
| 5777 | * reference if they receive an UNREGISTER event. |
| 5778 | * We can get stuck here if buggy protocols don't correctly |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5779 | * call dev_put. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5780 | */ |
| 5781 | static void netdev_wait_allrefs(struct net_device *dev) |
| 5782 | { |
| 5783 | unsigned long rebroadcast_time, warning_time; |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5784 | int refcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5785 | |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 5786 | linkwatch_forget_dev(dev); |
| 5787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5788 | rebroadcast_time = warning_time = jiffies; |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5789 | refcnt = netdev_refcnt_read(dev); |
| 5790 | |
| 5791 | while (refcnt != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5792 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5793 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5794 | |
| 5795 | /* Rebroadcast unregister notification */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5796 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5797 | /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users |
Octavian Purdila | 395264d | 2009-11-16 13:49:35 +0000 | [diff] [blame] | 5798 | * should have already handle it the first time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5799 | |
| 5800 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
| 5801 | &dev->state)) { |
| 5802 | /* We must not have linkwatch events |
| 5803 | * pending on unregister. If this |
| 5804 | * happens, we simply run the queue |
| 5805 | * unscheduled, resulting in a noop |
| 5806 | * for this device. |
| 5807 | */ |
| 5808 | linkwatch_run_queue(); |
| 5809 | } |
| 5810 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5811 | __rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5812 | |
| 5813 | rebroadcast_time = jiffies; |
| 5814 | } |
| 5815 | |
| 5816 | msleep(250); |
| 5817 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5818 | refcnt = netdev_refcnt_read(dev); |
| 5819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5820 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
| 5821 | printk(KERN_EMERG "unregister_netdevice: " |
| 5822 | "waiting for %s to become free. Usage " |
| 5823 | "count = %d\n", |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5824 | dev->name, refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5825 | warning_time = jiffies; |
| 5826 | } |
| 5827 | } |
| 5828 | } |
| 5829 | |
| 5830 | /* The sequence is: |
| 5831 | * |
| 5832 | * rtnl_lock(); |
| 5833 | * ... |
| 5834 | * register_netdevice(x1); |
| 5835 | * register_netdevice(x2); |
| 5836 | * ... |
| 5837 | * unregister_netdevice(y1); |
| 5838 | * unregister_netdevice(y2); |
| 5839 | * ... |
| 5840 | * rtnl_unlock(); |
| 5841 | * free_netdev(y1); |
| 5842 | * free_netdev(y2); |
| 5843 | * |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5844 | * We are invoked by rtnl_unlock(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5845 | * This allows us to deal with problems: |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5846 | * 1) We can delete sysfs objects which invoke hotplug |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5847 | * without deadlocking with linkwatch via keventd. |
| 5848 | * 2) Since we run with the RTNL semaphore not held, we can sleep |
| 5849 | * 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] | 5850 | * |
| 5851 | * We must not return until all unregister events added during |
| 5852 | * the interval the lock was held have been completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5853 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5854 | void netdev_run_todo(void) |
| 5855 | { |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5856 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5858 | /* Snapshot list, allow later requests */ |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5859 | list_replace_init(&net_todo_list, &list); |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5860 | |
| 5861 | __rtnl_unlock(); |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5862 | |
Eric W. Biederman | 850a545 | 2011-10-13 22:25:23 +0000 | [diff] [blame] | 5863 | /* Wait for rcu callbacks to finish before attempting to drain |
| 5864 | * the device list. This usually avoids a 250ms wait. |
| 5865 | */ |
| 5866 | if (!list_empty(&list)) |
| 5867 | rcu_barrier(); |
| 5868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5869 | while (!list_empty(&list)) { |
| 5870 | struct net_device *dev |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 5871 | = list_first_entry(&list, struct net_device, todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5872 | list_del(&dev->todo_list); |
| 5873 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5874 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5875 | printk(KERN_ERR "network todo '%s' but state %d\n", |
| 5876 | dev->name, dev->reg_state); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5877 | dump_stack(); |
| 5878 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5879 | } |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5880 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5881 | dev->reg_state = NETREG_UNREGISTERED; |
| 5882 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 5883 | on_each_cpu(flush_backlog, dev, 1); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 5884 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5885 | netdev_wait_allrefs(dev); |
| 5886 | |
| 5887 | /* paranoia */ |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 5888 | BUG_ON(netdev_refcnt_read(dev)); |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 5889 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
| 5890 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 5891 | WARN_ON(dev->dn_ptr); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5892 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5893 | if (dev->destructor) |
| 5894 | dev->destructor(dev); |
Stephen Hemminger | 9093bbb | 2007-05-19 15:39:25 -0700 | [diff] [blame] | 5895 | |
| 5896 | /* Free network device */ |
| 5897 | kobject_put(&dev->dev.kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5898 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5899 | } |
| 5900 | |
Ben Hutchings | 3cfde79 | 2010-07-09 09:11:52 +0000 | [diff] [blame] | 5901 | /* Convert net_device_stats to rtnl_link_stats64. They have the same |
| 5902 | * fields in the same order, with only the type differing. |
| 5903 | */ |
| 5904 | static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
| 5905 | const struct net_device_stats *netdev_stats) |
| 5906 | { |
| 5907 | #if BITS_PER_LONG == 64 |
| 5908 | BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats)); |
| 5909 | memcpy(stats64, netdev_stats, sizeof(*stats64)); |
| 5910 | #else |
| 5911 | size_t i, n = sizeof(*stats64) / sizeof(u64); |
| 5912 | const unsigned long *src = (const unsigned long *)netdev_stats; |
| 5913 | u64 *dst = (u64 *)stats64; |
| 5914 | |
| 5915 | BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) != |
| 5916 | sizeof(*stats64) / sizeof(u64)); |
| 5917 | for (i = 0; i < n; i++) |
| 5918 | dst[i] = src[i]; |
| 5919 | #endif |
| 5920 | } |
| 5921 | |
Eric Dumazet | d83345a | 2009-11-16 03:36:51 +0000 | [diff] [blame] | 5922 | /** |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5923 | * dev_get_stats - get network device statistics |
| 5924 | * @dev: device to get statistics from |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5925 | * @storage: place to store stats |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5926 | * |
Ben Hutchings | d775351 | 2010-07-09 09:12:41 +0000 | [diff] [blame] | 5927 | * Get network statistics from device. Return @storage. |
| 5928 | * The device driver may provide its own method by setting |
| 5929 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; |
| 5930 | * otherwise the internal statistics structure is used. |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5931 | */ |
Ben Hutchings | d775351 | 2010-07-09 09:12:41 +0000 | [diff] [blame] | 5932 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
| 5933 | struct rtnl_link_stats64 *storage) |
Eric Dumazet | 7004bf2 | 2009-05-18 00:34:33 +0000 | [diff] [blame] | 5934 | { |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5935 | const struct net_device_ops *ops = dev->netdev_ops; |
| 5936 | |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5937 | if (ops->ndo_get_stats64) { |
| 5938 | memset(storage, 0, sizeof(*storage)); |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 5939 | ops->ndo_get_stats64(dev, storage); |
| 5940 | } else if (ops->ndo_get_stats) { |
Ben Hutchings | 3cfde79 | 2010-07-09 09:11:52 +0000 | [diff] [blame] | 5941 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 5942 | } else { |
| 5943 | netdev_stats_to_stats64(storage, &dev->stats); |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5944 | } |
Eric Dumazet | caf586e | 2010-09-30 21:06:55 +0000 | [diff] [blame] | 5945 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
Eric Dumazet | 2817273 | 2010-07-07 14:58:56 -0700 | [diff] [blame] | 5946 | return storage; |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5947 | } |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5948 | EXPORT_SYMBOL(dev_get_stats); |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5949 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5950 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5951 | { |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5952 | struct netdev_queue *queue = dev_ingress_queue(dev); |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5953 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5954 | #ifdef CONFIG_NET_CLS_ACT |
| 5955 | if (queue) |
| 5956 | return queue; |
| 5957 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); |
| 5958 | if (!queue) |
| 5959 | return NULL; |
| 5960 | netdev_init_one_queue(dev, queue, NULL); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 5961 | queue->qdisc = &noop_qdisc; |
| 5962 | queue->qdisc_sleeping = &noop_qdisc; |
| 5963 | rcu_assign_pointer(dev->ingress_queue, queue); |
| 5964 | #endif |
| 5965 | return queue; |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5966 | } |
| 5967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5968 | /** |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 5969 | * alloc_netdev_mqs - allocate network device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5970 | * @sizeof_priv: size of private data to allocate space for |
| 5971 | * @name: device name format string |
| 5972 | * @setup: callback to initialize device |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 5973 | * @txqs: the number of TX subqueues to allocate |
| 5974 | * @rxqs: the number of RX subqueues to allocate |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5975 | * |
| 5976 | * 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] | 5977 | * and performs basic initialization. Also allocates subquue structs |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 5978 | * for each queue on the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5979 | */ |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 5980 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
| 5981 | void (*setup)(struct net_device *), |
| 5982 | unsigned int txqs, unsigned int rxqs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5983 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5984 | struct net_device *dev; |
Stephen Hemminger | 7943986 | 2008-07-21 13:28:44 -0700 | [diff] [blame] | 5985 | size_t alloc_size; |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5986 | struct net_device *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5987 | |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 5988 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
| 5989 | |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 5990 | if (txqs < 1) { |
Tom Herbert | 55513fb | 2010-10-18 17:55:58 +0000 | [diff] [blame] | 5991 | pr_err("alloc_netdev: Unable to allocate device " |
| 5992 | "with zero queues.\n"); |
| 5993 | return NULL; |
| 5994 | } |
| 5995 | |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 5996 | #ifdef CONFIG_RPS |
| 5997 | if (rxqs < 1) { |
| 5998 | pr_err("alloc_netdev: Unable to allocate device " |
| 5999 | "with zero RX queues.\n"); |
| 6000 | return NULL; |
| 6001 | } |
| 6002 | #endif |
| 6003 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 6004 | alloc_size = sizeof(struct net_device); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 6005 | if (sizeof_priv) { |
| 6006 | /* ensure 32-byte alignment of private area */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 6007 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 6008 | alloc_size += sizeof_priv; |
| 6009 | } |
| 6010 | /* ensure 32-byte alignment of whole construct */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 6011 | alloc_size += NETDEV_ALIGN - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6012 | |
Paolo 'Blaisorblade' Giarrusso | 31380de | 2006-04-06 22:38:28 -0700 | [diff] [blame] | 6013 | p = kzalloc(alloc_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6014 | if (!p) { |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 6015 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6016 | return NULL; |
| 6017 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6018 | |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 6019 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6020 | dev->padded = (char *)dev - (char *)p; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6021 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6022 | dev->pcpu_refcnt = alloc_percpu(int); |
| 6023 | if (!dev->pcpu_refcnt) |
Tom Herbert | e648493 | 2010-10-18 18:04:39 +0000 | [diff] [blame] | 6024 | goto free_p; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6026 | if (dev_addr_init(dev)) |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6027 | goto free_pcpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6028 | |
Jiri Pirko | 22bedad | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 6029 | dev_mc_init(dev); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 6030 | dev_uc_init(dev); |
Jiri Pirko | ccffad2 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 6031 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 6032 | dev_net_set(dev, &init_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6033 | |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 6034 | dev->gso_max_size = GSO_MAX_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6035 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 6036 | INIT_LIST_HEAD(&dev->napi_list); |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 6037 | INIT_LIST_HEAD(&dev->unreg_list); |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 6038 | INIT_LIST_HEAD(&dev->link_watch_list); |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 6039 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6040 | setup(dev); |
David S. Miller | 8d3bdbd | 2011-02-08 15:02:50 -0800 | [diff] [blame] | 6041 | |
| 6042 | dev->num_tx_queues = txqs; |
| 6043 | dev->real_num_tx_queues = txqs; |
| 6044 | if (netif_alloc_netdev_queues(dev)) |
| 6045 | goto free_all; |
| 6046 | |
| 6047 | #ifdef CONFIG_RPS |
| 6048 | dev->num_rx_queues = rxqs; |
| 6049 | dev->real_num_rx_queues = rxqs; |
| 6050 | if (netif_alloc_rx_queues(dev)) |
| 6051 | goto free_all; |
| 6052 | #endif |
| 6053 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6054 | strcpy(dev->name, name); |
Vlad Dogaru | cbda10f | 2011-01-13 23:38:30 +0000 | [diff] [blame] | 6055 | dev->group = INIT_NETDEV_GROUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6056 | return dev; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6057 | |
David S. Miller | 8d3bdbd | 2011-02-08 15:02:50 -0800 | [diff] [blame] | 6058 | free_all: |
| 6059 | free_netdev(dev); |
| 6060 | return NULL; |
| 6061 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6062 | free_pcpu: |
| 6063 | free_percpu(dev->pcpu_refcnt); |
Tom Herbert | ed9af2e | 2010-11-09 10:47:30 +0000 | [diff] [blame] | 6064 | kfree(dev->_tx); |
Tom Herbert | fe82224 | 2010-11-09 10:47:38 +0000 | [diff] [blame] | 6065 | #ifdef CONFIG_RPS |
| 6066 | kfree(dev->_rx); |
| 6067 | #endif |
| 6068 | |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 6069 | free_p: |
| 6070 | kfree(p); |
| 6071 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6072 | } |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 6073 | EXPORT_SYMBOL(alloc_netdev_mqs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6074 | |
| 6075 | /** |
| 6076 | * free_netdev - free network device |
| 6077 | * @dev: device |
| 6078 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 6079 | * This function does the last stage of destroying an allocated device |
| 6080 | * interface. The reference to the device object is released. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6081 | * If this is the last reference then it will be freed. |
| 6082 | */ |
| 6083 | void free_netdev(struct net_device *dev) |
| 6084 | { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 6085 | struct napi_struct *p, *n; |
| 6086 | |
Denis V. Lunev | f3005d7 | 2008-04-16 02:02:18 -0700 | [diff] [blame] | 6087 | release_net(dev_net(dev)); |
| 6088 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 6089 | kfree(dev->_tx); |
Tom Herbert | fe82224 | 2010-11-09 10:47:38 +0000 | [diff] [blame] | 6090 | #ifdef CONFIG_RPS |
| 6091 | kfree(dev->_rx); |
| 6092 | #endif |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 6093 | |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 6094 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 6095 | |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 6096 | /* Flush device addresses */ |
| 6097 | dev_addr_flush(dev); |
| 6098 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 6099 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
| 6100 | netif_napi_del(p); |
| 6101 | |
Eric Dumazet | 29b4433 | 2010-10-11 10:22:12 +0000 | [diff] [blame] | 6102 | free_percpu(dev->pcpu_refcnt); |
| 6103 | dev->pcpu_refcnt = NULL; |
| 6104 | |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 6105 | /* Compatibility with error handling in drivers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6106 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 6107 | kfree((char *)dev - dev->padded); |
| 6108 | return; |
| 6109 | } |
| 6110 | |
| 6111 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); |
| 6112 | dev->reg_state = NETREG_RELEASED; |
| 6113 | |
Greg Kroah-Hartman | 43cb76d | 2002-04-09 12:14:34 -0700 | [diff] [blame] | 6114 | /* will free via device release */ |
| 6115 | put_device(&dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6116 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 6117 | EXPORT_SYMBOL(free_netdev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 6118 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 6119 | /** |
| 6120 | * synchronize_net - Synchronize with packet receive processing |
| 6121 | * |
| 6122 | * Wait for packets currently being received to be done. |
| 6123 | * Does not block later packets from starting. |
| 6124 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 6125 | void synchronize_net(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6126 | { |
| 6127 | might_sleep(); |
Eric Dumazet | be3fc41 | 2011-05-23 23:07:32 +0000 | [diff] [blame] | 6128 | if (rtnl_is_locked()) |
| 6129 | synchronize_rcu_expedited(); |
| 6130 | else |
| 6131 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6132 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 6133 | EXPORT_SYMBOL(synchronize_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6134 | |
| 6135 | /** |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6136 | * unregister_netdevice_queue - remove device from the kernel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6137 | * @dev: device |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6138 | * @head: list |
Jaswinder Singh Rajput | 6ebfbc0 | 2009-11-22 20:43:13 -0800 | [diff] [blame] | 6139 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6140 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 6141 | * from the kernel tables. |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6142 | * If head not NULL, device is queued to be unregistered later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6143 | * |
| 6144 | * Callers must hold the rtnl semaphore. You may want |
| 6145 | * unregister_netdev() instead of this. |
| 6146 | */ |
| 6147 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6148 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6149 | { |
Herbert Xu | a662071 | 2007-12-12 19:21:56 -0800 | [diff] [blame] | 6150 | ASSERT_RTNL(); |
| 6151 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6152 | if (head) { |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 6153 | list_move_tail(&dev->unreg_list, head); |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6154 | } else { |
| 6155 | rollback_registered(dev); |
| 6156 | /* Finish processing unregister after unlock */ |
| 6157 | net_set_todo(dev); |
| 6158 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6159 | } |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 6160 | EXPORT_SYMBOL(unregister_netdevice_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6161 | |
| 6162 | /** |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 6163 | * unregister_netdevice_many - unregister many devices |
| 6164 | * @head: list of devices |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 6165 | */ |
| 6166 | void unregister_netdevice_many(struct list_head *head) |
| 6167 | { |
| 6168 | struct net_device *dev; |
| 6169 | |
| 6170 | if (!list_empty(head)) { |
| 6171 | rollback_registered_many(head); |
| 6172 | list_for_each_entry(dev, head, unreg_list) |
| 6173 | net_set_todo(dev); |
| 6174 | } |
| 6175 | } |
Eric Dumazet | 63c8099 | 2009-10-27 07:06:49 +0000 | [diff] [blame] | 6176 | EXPORT_SYMBOL(unregister_netdevice_many); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 6177 | |
| 6178 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6179 | * unregister_netdev - remove device from the kernel |
| 6180 | * @dev: device |
| 6181 | * |
| 6182 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 6183 | * from the kernel tables. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6184 | * |
| 6185 | * This is just a wrapper for unregister_netdevice that takes |
| 6186 | * the rtnl semaphore. In general you want to use this and not |
| 6187 | * unregister_netdevice. |
| 6188 | */ |
| 6189 | void unregister_netdev(struct net_device *dev) |
| 6190 | { |
| 6191 | rtnl_lock(); |
| 6192 | unregister_netdevice(dev); |
| 6193 | rtnl_unlock(); |
| 6194 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6195 | EXPORT_SYMBOL(unregister_netdev); |
| 6196 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6197 | /** |
| 6198 | * dev_change_net_namespace - move device to different nethost namespace |
| 6199 | * @dev: device |
| 6200 | * @net: network namespace |
| 6201 | * @pat: If not NULL name pattern to try if the current device name |
| 6202 | * is already taken in the destination network namespace. |
| 6203 | * |
| 6204 | * This function shuts down a device interface and moves it |
| 6205 | * to a new network namespace. On success 0 is returned, on |
| 6206 | * a failure a netagive errno code is returned. |
| 6207 | * |
| 6208 | * Callers must hold the rtnl semaphore. |
| 6209 | */ |
| 6210 | |
| 6211 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) |
| 6212 | { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6213 | int err; |
| 6214 | |
| 6215 | ASSERT_RTNL(); |
| 6216 | |
| 6217 | /* Don't allow namespace local devices to be moved. */ |
| 6218 | err = -EINVAL; |
| 6219 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 6220 | goto out; |
| 6221 | |
| 6222 | /* Ensure the device has been registrered */ |
| 6223 | err = -EINVAL; |
| 6224 | if (dev->reg_state != NETREG_REGISTERED) |
| 6225 | goto out; |
| 6226 | |
| 6227 | /* Get out if there is nothing todo */ |
| 6228 | err = 0; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 6229 | if (net_eq(dev_net(dev), net)) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6230 | goto out; |
| 6231 | |
| 6232 | /* Pick the destination device name, and ensure |
| 6233 | * we can use it in the destination network namespace. |
| 6234 | */ |
| 6235 | err = -EEXIST; |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 6236 | if (__dev_get_by_name(net, dev->name)) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6237 | /* We get here if we can't use the current device name */ |
| 6238 | if (!pat) |
| 6239 | goto out; |
Jiri Pirko | 1c5cae8 | 2011-04-30 01:21:32 +0000 | [diff] [blame] | 6240 | if (dev_get_valid_name(dev, pat) < 0) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6241 | goto out; |
| 6242 | } |
| 6243 | |
| 6244 | /* |
| 6245 | * And now a mini version of register_netdevice unregister_netdevice. |
| 6246 | */ |
| 6247 | |
| 6248 | /* If device is running close it first. */ |
Pavel Emelyanov | 9b77265 | 2007-10-10 02:49:09 -0700 | [diff] [blame] | 6249 | dev_close(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6250 | |
| 6251 | /* And unlink it from device chain */ |
| 6252 | err = -ENODEV; |
| 6253 | unlist_netdevice(dev); |
| 6254 | |
| 6255 | synchronize_net(); |
| 6256 | |
| 6257 | /* Shutdown queueing discipline. */ |
| 6258 | dev_shutdown(dev); |
| 6259 | |
| 6260 | /* Notify protocols, that we are about to destroy |
| 6261 | this device. They should clean all the things. |
David Lamparter | 3b27e10 | 2010-09-17 03:22:19 +0000 | [diff] [blame] | 6262 | |
| 6263 | Note that dev->reg_state stays at NETREG_REGISTERED. |
| 6264 | This is wanted because this way 8021q and macvlan know |
| 6265 | the device is just moving and can keep their slaves up. |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6266 | */ |
| 6267 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 6268 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
Eric W. Biederman | d2237d3 | 2011-10-21 06:24:20 +0000 | [diff] [blame] | 6269 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6270 | |
| 6271 | /* |
| 6272 | * Flush the unicast and multicast chains |
| 6273 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 6274 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 6275 | dev_mc_flush(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6276 | |
| 6277 | /* Actually switch the network namespace */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 6278 | dev_net_set(dev, net); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6279 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6280 | /* If there is an ifindex conflict assign a new one */ |
| 6281 | if (__dev_get_by_index(net, dev->ifindex)) { |
| 6282 | int iflink = (dev->iflink == dev->ifindex); |
| 6283 | dev->ifindex = dev_new_index(net); |
| 6284 | if (iflink) |
| 6285 | dev->iflink = dev->ifindex; |
| 6286 | } |
| 6287 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 6288 | /* Fixup kobjects */ |
Eric W. Biederman | a1b3f59 | 2010-05-04 17:36:49 -0700 | [diff] [blame] | 6289 | err = device_rename(&dev->dev, dev->name); |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 6290 | WARN_ON(err); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6291 | |
| 6292 | /* Add the device back in the hashes */ |
| 6293 | list_netdevice(dev); |
| 6294 | |
| 6295 | /* Notify protocols, that a new device appeared. */ |
| 6296 | call_netdevice_notifiers(NETDEV_REGISTER, dev); |
| 6297 | |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 6298 | /* |
| 6299 | * Prevent userspace races by waiting until the network |
| 6300 | * device is fully setup before sending notifications. |
| 6301 | */ |
| 6302 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
| 6303 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6304 | synchronize_net(); |
| 6305 | err = 0; |
| 6306 | out: |
| 6307 | return err; |
| 6308 | } |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 6309 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6311 | static int dev_cpu_callback(struct notifier_block *nfb, |
| 6312 | unsigned long action, |
| 6313 | void *ocpu) |
| 6314 | { |
| 6315 | struct sk_buff **list_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6316 | struct sk_buff *skb; |
| 6317 | unsigned int cpu, oldcpu = (unsigned long)ocpu; |
| 6318 | struct softnet_data *sd, *oldsd; |
| 6319 | |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 6320 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6321 | return NOTIFY_OK; |
| 6322 | |
| 6323 | local_irq_disable(); |
| 6324 | cpu = smp_processor_id(); |
| 6325 | sd = &per_cpu(softnet_data, cpu); |
| 6326 | oldsd = &per_cpu(softnet_data, oldcpu); |
| 6327 | |
| 6328 | /* Find end of our completion_queue. */ |
| 6329 | list_skb = &sd->completion_queue; |
| 6330 | while (*list_skb) |
| 6331 | list_skb = &(*list_skb)->next; |
| 6332 | /* Append completion queue from offline CPU. */ |
| 6333 | *list_skb = oldsd->completion_queue; |
| 6334 | oldsd->completion_queue = NULL; |
| 6335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6336 | /* Append output queue from offline CPU. */ |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 6337 | if (oldsd->output_queue) { |
| 6338 | *sd->output_queue_tailp = oldsd->output_queue; |
| 6339 | sd->output_queue_tailp = oldsd->output_queue_tailp; |
| 6340 | oldsd->output_queue = NULL; |
| 6341 | oldsd->output_queue_tailp = &oldsd->output_queue; |
| 6342 | } |
Heiko Carstens | 264524d | 2011-06-06 20:50:03 +0000 | [diff] [blame] | 6343 | /* Append NAPI poll list from offline CPU. */ |
| 6344 | if (!list_empty(&oldsd->poll_list)) { |
| 6345 | list_splice_init(&oldsd->poll_list, &sd->poll_list); |
| 6346 | raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 6347 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6348 | |
| 6349 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 6350 | local_irq_enable(); |
| 6351 | |
| 6352 | /* Process offline CPU's input_pkt_queue */ |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 6353 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
| 6354 | netif_rx(skb); |
| 6355 | input_queue_head_incr(oldsd); |
| 6356 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 6357 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6358 | netif_rx(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 6359 | input_queue_head_incr(oldsd); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 6360 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6361 | |
| 6362 | return NOTIFY_OK; |
| 6363 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6364 | |
| 6365 | |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6366 | /** |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 6367 | * netdev_increment_features - increment feature set by one |
| 6368 | * @all: current feature set |
| 6369 | * @one: new feature set |
| 6370 | * @mask: mask feature set |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6371 | * |
| 6372 | * Computes a new feature set after adding a device with feature set |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 6373 | * @one to the master device with current feature set @all. Will not |
| 6374 | * enable anything that is off in @mask. Returns the new feature set. |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6375 | */ |
Michał Mirosław | 04ed3e7 | 2011-01-24 15:32:47 -0800 | [diff] [blame] | 6376 | u32 netdev_increment_features(u32 all, u32 one, u32 mask) |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6377 | { |
Michał Mirosław | 1742f18 | 2011-04-22 06:31:16 +0000 | [diff] [blame] | 6378 | if (mask & NETIF_F_GEN_CSUM) |
| 6379 | mask |= NETIF_F_ALL_CSUM; |
| 6380 | mask |= NETIF_F_VLAN_CHALLENGED; |
| 6381 | |
| 6382 | all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask; |
| 6383 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
| 6384 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 6385 | /* If device needs checksumming, downgrade to it. */ |
Michał Mirosław | 1742f18 | 2011-04-22 06:31:16 +0000 | [diff] [blame] | 6386 | if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM)) |
| 6387 | all &= ~NETIF_F_NO_CSUM; |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6388 | |
Michał Mirosław | 1742f18 | 2011-04-22 06:31:16 +0000 | [diff] [blame] | 6389 | /* If one device supports hw checksumming, set for all. */ |
| 6390 | if (all & NETIF_F_GEN_CSUM) |
| 6391 | all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM); |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6392 | |
| 6393 | return all; |
| 6394 | } |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 6395 | EXPORT_SYMBOL(netdev_increment_features); |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 6396 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6397 | static struct hlist_head *netdev_create_hash(void) |
| 6398 | { |
| 6399 | int i; |
| 6400 | struct hlist_head *hash; |
| 6401 | |
| 6402 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); |
| 6403 | if (hash != NULL) |
| 6404 | for (i = 0; i < NETDEV_HASHENTRIES; i++) |
| 6405 | INIT_HLIST_HEAD(&hash[i]); |
| 6406 | |
| 6407 | return hash; |
| 6408 | } |
| 6409 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6410 | /* Initialize per network namespace state */ |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 6411 | static int __net_init netdev_init(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6412 | { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6413 | INIT_LIST_HEAD(&net->dev_base_head); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6414 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6415 | net->dev_name_head = netdev_create_hash(); |
| 6416 | if (net->dev_name_head == NULL) |
| 6417 | goto err_name; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6418 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6419 | net->dev_index_head = netdev_create_hash(); |
| 6420 | if (net->dev_index_head == NULL) |
| 6421 | goto err_idx; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6422 | |
| 6423 | return 0; |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 6424 | |
| 6425 | err_idx: |
| 6426 | kfree(net->dev_name_head); |
| 6427 | err_name: |
| 6428 | return -ENOMEM; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6429 | } |
| 6430 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 6431 | /** |
| 6432 | * netdev_drivername - network driver for the device |
| 6433 | * @dev: network device |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 6434 | * |
| 6435 | * Determine network driver for device. |
| 6436 | */ |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6437 | const char *netdev_drivername(const struct net_device *dev) |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6438 | { |
Stephen Hemminger | cf04a4c | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 6439 | const struct device_driver *driver; |
| 6440 | const struct device *parent; |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6441 | const char *empty = ""; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6442 | |
| 6443 | parent = dev->dev.parent; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6444 | if (!parent) |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6445 | return empty; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6446 | |
| 6447 | driver = parent->driver; |
| 6448 | if (driver && driver->name) |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 6449 | return driver->name; |
| 6450 | return empty; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 6451 | } |
| 6452 | |
Jason Baron | ffa10cb | 2011-08-11 14:36:48 -0400 | [diff] [blame] | 6453 | int __netdev_printk(const char *level, const struct net_device *dev, |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6454 | struct va_format *vaf) |
| 6455 | { |
| 6456 | int r; |
| 6457 | |
| 6458 | if (dev && dev->dev.parent) |
| 6459 | r = dev_printk(level, dev->dev.parent, "%s: %pV", |
| 6460 | netdev_name(dev), vaf); |
| 6461 | else if (dev) |
| 6462 | r = printk("%s%s: %pV", level, netdev_name(dev), vaf); |
| 6463 | else |
| 6464 | r = printk("%s(NULL net_device): %pV", level, vaf); |
| 6465 | |
| 6466 | return r; |
| 6467 | } |
Jason Baron | ffa10cb | 2011-08-11 14:36:48 -0400 | [diff] [blame] | 6468 | EXPORT_SYMBOL(__netdev_printk); |
Joe Perches | 256df2f | 2010-06-27 01:02:35 +0000 | [diff] [blame] | 6469 | |
| 6470 | int netdev_printk(const char *level, const struct net_device *dev, |
| 6471 | const char *format, ...) |
| 6472 | { |
| 6473 | struct va_format vaf; |
| 6474 | va_list args; |
| 6475 | int r; |
| 6476 | |
| 6477 | va_start(args, format); |
| 6478 | |
| 6479 | vaf.fmt = format; |
| 6480 | vaf.va = &args; |
| 6481 | |
| 6482 | r = __netdev_printk(level, dev, &vaf); |
| 6483 | va_end(args); |
| 6484 | |
| 6485 | return r; |
| 6486 | } |
| 6487 | EXPORT_SYMBOL(netdev_printk); |
| 6488 | |
| 6489 | #define define_netdev_printk_level(func, level) \ |
| 6490 | int func(const struct net_device *dev, const char *fmt, ...) \ |
| 6491 | { \ |
| 6492 | int r; \ |
| 6493 | struct va_format vaf; \ |
| 6494 | va_list args; \ |
| 6495 | \ |
| 6496 | va_start(args, fmt); \ |
| 6497 | \ |
| 6498 | vaf.fmt = fmt; \ |
| 6499 | vaf.va = &args; \ |
| 6500 | \ |
| 6501 | r = __netdev_printk(level, dev, &vaf); \ |
| 6502 | va_end(args); \ |
| 6503 | \ |
| 6504 | return r; \ |
| 6505 | } \ |
| 6506 | EXPORT_SYMBOL(func); |
| 6507 | |
| 6508 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); |
| 6509 | define_netdev_printk_level(netdev_alert, KERN_ALERT); |
| 6510 | define_netdev_printk_level(netdev_crit, KERN_CRIT); |
| 6511 | define_netdev_printk_level(netdev_err, KERN_ERR); |
| 6512 | define_netdev_printk_level(netdev_warn, KERN_WARNING); |
| 6513 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); |
| 6514 | define_netdev_printk_level(netdev_info, KERN_INFO); |
| 6515 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 6516 | static void __net_exit netdev_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6517 | { |
| 6518 | kfree(net->dev_name_head); |
| 6519 | kfree(net->dev_index_head); |
| 6520 | } |
| 6521 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 6522 | static struct pernet_operations __net_initdata netdev_net_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6523 | .init = netdev_init, |
| 6524 | .exit = netdev_exit, |
| 6525 | }; |
| 6526 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 6527 | static void __net_exit default_device_exit(struct net *net) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6528 | { |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6529 | struct net_device *dev, *aux; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6530 | /* |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6531 | * Push all migratable network devices back to the |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6532 | * initial network namespace |
| 6533 | */ |
| 6534 | rtnl_lock(); |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6535 | for_each_netdev_safe(net, dev, aux) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6536 | int err; |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 6537 | char fb_name[IFNAMSIZ]; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6538 | |
| 6539 | /* Ignore unmoveable devices (i.e. loopback) */ |
| 6540 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 6541 | continue; |
| 6542 | |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 6543 | /* Leave virtual devices for the generic cleanup */ |
| 6544 | if (dev->rtnl_link_ops) |
| 6545 | continue; |
Eric W. Biederman | d0c082c | 2008-11-05 15:59:38 -0800 | [diff] [blame] | 6546 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 6547 | /* Push remaining network devices to init_net */ |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 6548 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
| 6549 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6550 | if (err) { |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 6551 | printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n", |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6552 | __func__, dev->name, err); |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 6553 | BUG(); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6554 | } |
| 6555 | } |
| 6556 | rtnl_unlock(); |
| 6557 | } |
| 6558 | |
Eric W. Biederman | 04dc7f6 | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6559 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
| 6560 | { |
| 6561 | /* At exit all network devices most be removed from a network |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 6562 | * namespace. Do this in the reverse order of registration. |
Eric W. Biederman | 04dc7f6 | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6563 | * Do this across as many network namespaces as possible to |
| 6564 | * improve batching efficiency. |
| 6565 | */ |
| 6566 | struct net_device *dev; |
| 6567 | struct net *net; |
| 6568 | LIST_HEAD(dev_kill_list); |
| 6569 | |
| 6570 | rtnl_lock(); |
| 6571 | list_for_each_entry(net, net_list, exit_list) { |
| 6572 | for_each_netdev_reverse(net, dev) { |
| 6573 | if (dev->rtnl_link_ops) |
| 6574 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
| 6575 | else |
| 6576 | unregister_netdevice_queue(dev, &dev_kill_list); |
| 6577 | } |
| 6578 | } |
| 6579 | unregister_netdevice_many(&dev_kill_list); |
Eric Dumazet | ceaaec9 | 2011-02-17 22:59:19 +0000 | [diff] [blame] | 6580 | list_del(&dev_kill_list); |
Eric W. Biederman | 04dc7f6 | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6581 | rtnl_unlock(); |
| 6582 | } |
| 6583 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 6584 | static struct pernet_operations __net_initdata default_device_ops = { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6585 | .exit = default_device_exit, |
Eric W. Biederman | 04dc7f6 | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 6586 | .exit_batch = default_device_exit_batch, |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 6587 | }; |
| 6588 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6589 | /* |
| 6590 | * Initialize the DEV module. At boot time this walks the device list and |
| 6591 | * unhooks any devices that fail to initialise (normally hardware not |
| 6592 | * present) and leaves us with a valid list of present and active devices. |
| 6593 | * |
| 6594 | */ |
| 6595 | |
| 6596 | /* |
| 6597 | * This is called single threaded during boot, so no need |
| 6598 | * to take the rtnl semaphore. |
| 6599 | */ |
| 6600 | static int __init net_dev_init(void) |
| 6601 | { |
| 6602 | int i, rc = -ENOMEM; |
| 6603 | |
| 6604 | BUG_ON(!dev_boot_phase); |
| 6605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6606 | if (dev_proc_init()) |
| 6607 | goto out; |
| 6608 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 6609 | if (netdev_kobject_init()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6610 | goto out; |
| 6611 | |
| 6612 | INIT_LIST_HEAD(&ptype_all); |
Pavel Emelyanov | 82d8a86 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 6613 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6614 | INIT_LIST_HEAD(&ptype_base[i]); |
| 6615 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 6616 | if (register_pernet_subsys(&netdev_net_ops)) |
| 6617 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6618 | |
| 6619 | /* |
| 6620 | * Initialise the packet receive queues. |
| 6621 | */ |
| 6622 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 6623 | for_each_possible_cpu(i) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6624 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6625 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 6626 | memset(sd, 0, sizeof(*sd)); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6627 | skb_queue_head_init(&sd->input_pkt_queue); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 6628 | skb_queue_head_init(&sd->process_queue); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6629 | sd->completion_queue = NULL; |
| 6630 | INIT_LIST_HEAD(&sd->poll_list); |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 6631 | sd->output_queue = NULL; |
| 6632 | sd->output_queue_tailp = &sd->output_queue; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 6633 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6634 | sd->csd.func = rps_trigger_softirq; |
| 6635 | sd->csd.info = sd; |
| 6636 | sd->csd.flags = 0; |
| 6637 | sd->cpu = i; |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 6638 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 6639 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 6640 | sd->backlog.poll = process_backlog; |
| 6641 | sd->backlog.weight = weight_p; |
| 6642 | sd->backlog.gro_list = NULL; |
| 6643 | sd->backlog.gro_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6644 | } |
| 6645 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6646 | dev_boot_phase = 0; |
| 6647 | |
Eric W. Biederman | 505d4f7 | 2008-11-07 22:54:20 -0800 | [diff] [blame] | 6648 | /* The loopback device is special if any other network devices |
| 6649 | * is present in a network namespace the loopback device must |
| 6650 | * be present. Since we now dynamically allocate and free the |
| 6651 | * loopback device ensure this invariant is maintained by |
| 6652 | * keeping the loopback device as the first device on the |
| 6653 | * list of network devices. Ensuring the loopback devices |
| 6654 | * is the first device that appears and the last network device |
| 6655 | * that disappears. |
| 6656 | */ |
| 6657 | if (register_pernet_device(&loopback_net_ops)) |
| 6658 | goto out; |
| 6659 | |
| 6660 | if (register_pernet_device(&default_device_ops)) |
| 6661 | goto out; |
| 6662 | |
Carlos R. Mafra | 962cf36 | 2008-05-15 11:15:37 -0300 | [diff] [blame] | 6663 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
| 6664 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6665 | |
| 6666 | hotcpu_notifier(dev_cpu_callback, 0); |
| 6667 | dst_init(); |
| 6668 | dev_mcast_init(); |
| 6669 | rc = 0; |
| 6670 | out: |
| 6671 | return rc; |
| 6672 | } |
| 6673 | |
| 6674 | subsys_initcall(net_dev_init); |
| 6675 | |
Krishna Kumar | e88721f | 2009-02-18 17:55:02 -0800 | [diff] [blame] | 6676 | static int __init initialize_hashrnd(void) |
| 6677 | { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 6678 | get_random_bytes(&hashrnd, sizeof(hashrnd)); |
Krishna Kumar | e88721f | 2009-02-18 17:55:02 -0800 | [diff] [blame] | 6679 | return 0; |
| 6680 | } |
| 6681 | |
| 6682 | late_initcall_sync(initialize_hashrnd); |
| 6683 | |