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> |
| 104 | #include <linux/if_bridge.h> |
Patrick McHardy | b863ceb | 2007-07-14 18:55:06 -0700 | [diff] [blame] | 105 | #include <linux/if_macvlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #include <net/dst.h> |
| 107 | #include <net/pkt_sched.h> |
| 108 | #include <net/checksum.h> |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 109 | #include <net/xfrm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | #include <linux/highmem.h> |
| 111 | #include <linux/init.h> |
| 112 | #include <linux/kmod.h> |
| 113 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #include <linux/netpoll.h> |
| 115 | #include <linux/rcupdate.h> |
| 116 | #include <linux/delay.h> |
Johannes Berg | 295f4a1 | 2007-04-26 20:43:56 -0700 | [diff] [blame] | 117 | #include <net/wext.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #include <net/iw_handler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | #include <asm/current.h> |
Steve Grubb | 5bdb988 | 2005-12-03 08:39:35 -0500 | [diff] [blame] | 120 | #include <linux/audit.h> |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 121 | #include <linux/dmaengine.h> |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 122 | #include <linux/err.h> |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 123 | #include <linux/ctype.h> |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 124 | #include <linux/if_arp.h> |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 125 | #include <linux/if_vlan.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 126 | #include <linux/ip.h> |
Alexander Duyck | ad55dca | 2008-09-20 22:05:50 -0700 | [diff] [blame] | 127 | #include <net/ip.h> |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 128 | #include <linux/ipv6.h> |
| 129 | #include <linux/in.h> |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 130 | #include <linux/jhash.h> |
| 131 | #include <linux/random.h> |
David S. Miller | 9cbc1cb | 2009-06-15 03:02:23 -0700 | [diff] [blame] | 132 | #include <trace/events/napi.h> |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 133 | #include <linux/pci.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Pavel Emelyanov | 342709e | 2007-10-23 21:14:45 -0700 | [diff] [blame] | 135 | #include "net-sysfs.h" |
| 136 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 137 | /* Instead of increasing this, you should create a hash table. */ |
| 138 | #define MAX_GRO_SKBS 8 |
| 139 | |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 140 | /* This should be increased if a protocol with a bigger head is added. */ |
| 141 | #define GRO_MAX_HEAD (MAX_HEADER + 128) |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* |
| 144 | * The list of packet types we will receive (as opposed to discard) |
| 145 | * and the routines to invoke. |
| 146 | * |
| 147 | * Why 16. Because with 16 the only overlap we get on a hash of the |
| 148 | * low nibble of the protocol value is RARP/SNAP/X.25. |
| 149 | * |
| 150 | * NOTE: That is no longer true with the addition of VLAN tags. Not |
| 151 | * sure which should go first, but I bet it won't make much |
| 152 | * difference if we are running VLANs. The good news is that |
| 153 | * this protocol won't be in the list unless compiled in, so |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 154 | * the average user (w/out VLANs) will not be adversely affected. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | * --BLG |
| 156 | * |
| 157 | * 0800 IP |
| 158 | * 8100 802.1Q VLAN |
| 159 | * 0001 802.3 |
| 160 | * 0002 AX.25 |
| 161 | * 0004 802.2 |
| 162 | * 8035 RARP |
| 163 | * 0005 SNAP |
| 164 | * 0805 X.25 |
| 165 | * 0806 ARP |
| 166 | * 8137 IPX |
| 167 | * 0009 Localtalk |
| 168 | * 86DD IPv6 |
| 169 | */ |
| 170 | |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 171 | #define PTYPE_HASH_SIZE (16) |
| 172 | #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) |
| 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | static DEFINE_SPINLOCK(ptype_lock); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 175 | static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 176 | static struct list_head ptype_all __read_mostly; /* Taps */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | /* |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 179 | * 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] | 180 | * semaphore. |
| 181 | * |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 182 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | * |
| 184 | * Writers must hold the rtnl semaphore while they loop through the |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 185 | * 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] | 186 | * actual updates. This allows pure readers to access the list even |
| 187 | * while a writer is preparing to update it. |
| 188 | * |
| 189 | * To put it another way, dev_base_lock is held for writing only to |
| 190 | * protect against pure readers; the rtnl semaphore provides the |
| 191 | * protection against other writers. |
| 192 | * |
| 193 | * See, for example usages, register_netdevice() and |
| 194 | * unregister_netdevice(), which must be called with the rtnl |
| 195 | * semaphore held. |
| 196 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | DEFINE_RWLOCK(dev_base_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | EXPORT_SYMBOL(dev_base_lock); |
| 199 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 200 | 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] | 201 | { |
| 202 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
stephen hemminger | 08e9897 | 2009-11-10 07:20:34 +0000 | [diff] [blame] | 203 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 206 | 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] | 207 | { |
Eric Dumazet | 7c28bd0 | 2009-10-24 06:13:17 -0700 | [diff] [blame] | 208 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 211 | static inline void rps_lock(struct softnet_data *sd) |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 212 | { |
| 213 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 214 | spin_lock(&sd->input_pkt_queue.lock); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 215 | #endif |
| 216 | } |
| 217 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 218 | static inline void rps_unlock(struct softnet_data *sd) |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 219 | { |
| 220 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 221 | spin_unlock(&sd->input_pkt_queue.lock); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 222 | #endif |
| 223 | } |
| 224 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 225 | /* Device list insertion */ |
| 226 | static int list_netdevice(struct net_device *dev) |
| 227 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 228 | struct net *net = dev_net(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 229 | |
| 230 | ASSERT_RTNL(); |
| 231 | |
| 232 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 233 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 234 | 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] | 235 | hlist_add_head_rcu(&dev->index_hlist, |
| 236 | dev_index_hash(net, dev->ifindex)); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 237 | write_unlock_bh(&dev_base_lock); |
| 238 | return 0; |
| 239 | } |
| 240 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 241 | /* Device list removal |
| 242 | * caller must respect a RCU grace period before freeing/reusing dev |
| 243 | */ |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 244 | static void unlist_netdevice(struct net_device *dev) |
| 245 | { |
| 246 | ASSERT_RTNL(); |
| 247 | |
| 248 | /* Unlink dev from the device chain */ |
| 249 | write_lock_bh(&dev_base_lock); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 250 | list_del_rcu(&dev->dev_list); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 251 | hlist_del_rcu(&dev->name_hlist); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 252 | hlist_del_rcu(&dev->index_hlist); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 253 | write_unlock_bh(&dev_base_lock); |
| 254 | } |
| 255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | /* |
| 257 | * Our notifier list |
| 258 | */ |
| 259 | |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 260 | static RAW_NOTIFIER_HEAD(netdev_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | /* |
| 263 | * Device drivers call our routines to queue packets here. We empty the |
| 264 | * queue in the local softnet handler. |
| 265 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 266 | |
Eric Dumazet | 9958da0 | 2010-04-17 04:17:02 +0000 | [diff] [blame] | 267 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 268 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 270 | #ifdef CONFIG_LOCKDEP |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 271 | /* |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 272 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 273 | * according to dev->type |
| 274 | */ |
| 275 | static const unsigned short netdev_lock_type[] = |
| 276 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, |
| 277 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
| 278 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, |
| 279 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, |
| 280 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, |
| 281 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, |
| 282 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, |
| 283 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, |
| 284 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, |
| 285 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, |
| 286 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, |
| 287 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, |
| 288 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 289 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, |
Dmitry Eremin-Solenikov | 929122cd | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 290 | ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 291 | ARPHRD_VOID, ARPHRD_NONE}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 292 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 293 | static const char *const netdev_lock_name[] = |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 294 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
| 295 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", |
| 296 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", |
| 297 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", |
| 298 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", |
| 299 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", |
| 300 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", |
| 301 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", |
| 302 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", |
| 303 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", |
| 304 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", |
| 305 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", |
| 306 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", |
Rémi Denis-Courmont | 2d91d78 | 2008-12-17 15:47:29 -0800 | [diff] [blame] | 307 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", |
Dmitry Eremin-Solenikov | 929122cd | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 308 | "_xmit_PHONET_PIPE", "_xmit_IEEE802154", |
Sergey Lapin | fcb94e4 | 2009-06-08 12:18:47 +0000 | [diff] [blame] | 309 | "_xmit_VOID", "_xmit_NONE"}; |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 310 | |
| 311 | 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] | 312 | 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] | 313 | |
| 314 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) |
| 315 | { |
| 316 | int i; |
| 317 | |
| 318 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) |
| 319 | if (netdev_lock_type[i] == dev_type) |
| 320 | return i; |
| 321 | /* the last key is used by default */ |
| 322 | return ARRAY_SIZE(netdev_lock_type) - 1; |
| 323 | } |
| 324 | |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 325 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 326 | unsigned short dev_type) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 327 | { |
| 328 | int i; |
| 329 | |
| 330 | i = netdev_lock_pos(dev_type); |
| 331 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], |
| 332 | netdev_lock_name[i]); |
| 333 | } |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 334 | |
| 335 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
| 336 | { |
| 337 | int i; |
| 338 | |
| 339 | i = netdev_lock_pos(dev->type); |
| 340 | lockdep_set_class_and_name(&dev->addr_list_lock, |
| 341 | &netdev_addr_lock_key[i], |
| 342 | netdev_lock_name[i]); |
| 343 | } |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 344 | #else |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 345 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
| 346 | unsigned short dev_type) |
| 347 | { |
| 348 | } |
| 349 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
Jarek Poplawski | 723e98b | 2007-05-15 22:46:18 -0700 | [diff] [blame] | 350 | { |
| 351 | } |
| 352 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | /******************************************************************************* |
| 355 | |
| 356 | Protocol management and registration routines |
| 357 | |
| 358 | *******************************************************************************/ |
| 359 | |
| 360 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | * Add a protocol ID to the list. Now that the input handler is |
| 362 | * smarter we can dispense with all the messy stuff that used to be |
| 363 | * here. |
| 364 | * |
| 365 | * BEWARE!!! Protocol handlers, mangling input packets, |
| 366 | * MUST BE last in hash buckets and checking protocol handlers |
| 367 | * MUST start from promiscuous ptype_all chain in net_bh. |
| 368 | * It is true now, do not change it. |
| 369 | * Explanation follows: if protocol handler, mangling packet, will |
| 370 | * be the first on list, it is not able to sense, that packet |
| 371 | * is cloned and should be copied-on-write, so that it will |
| 372 | * change it and subsequent readers will get broken packet. |
| 373 | * --ANK (980803) |
| 374 | */ |
| 375 | |
| 376 | /** |
| 377 | * dev_add_pack - add packet handler |
| 378 | * @pt: packet type declaration |
| 379 | * |
| 380 | * Add a protocol handler to the networking stack. The passed &packet_type |
| 381 | * is linked into kernel lists and may not be freed until it has been |
| 382 | * removed from the kernel lists. |
| 383 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 384 | * This call does not sleep therefore it can not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | * guarantee all CPU's that are in middle of receiving packets |
| 386 | * will see the new packet type (until the next received packet). |
| 387 | */ |
| 388 | |
| 389 | void dev_add_pack(struct packet_type *pt) |
| 390 | { |
| 391 | int hash; |
| 392 | |
| 393 | spin_lock_bh(&ptype_lock); |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 394 | if (pt->type == htons(ETH_P_ALL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | list_add_rcu(&pt->list, &ptype_all); |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 396 | else { |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 397 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | list_add_rcu(&pt->list, &ptype_base[hash]); |
| 399 | } |
| 400 | spin_unlock_bh(&ptype_lock); |
| 401 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 402 | EXPORT_SYMBOL(dev_add_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | /** |
| 405 | * __dev_remove_pack - remove packet handler |
| 406 | * @pt: packet type declaration |
| 407 | * |
| 408 | * Remove a protocol handler that was previously added to the kernel |
| 409 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 410 | * 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] | 411 | * returns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | * |
| 413 | * The packet type might still be in use by receivers |
| 414 | * and must not be freed until after all the CPU's have gone |
| 415 | * through a quiescent state. |
| 416 | */ |
| 417 | void __dev_remove_pack(struct packet_type *pt) |
| 418 | { |
| 419 | struct list_head *head; |
| 420 | struct packet_type *pt1; |
| 421 | |
| 422 | spin_lock_bh(&ptype_lock); |
| 423 | |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 424 | if (pt->type == htons(ETH_P_ALL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | head = &ptype_all; |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 426 | else |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 427 | head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | list_for_each_entry(pt1, head, list) { |
| 430 | if (pt == pt1) { |
| 431 | list_del_rcu(&pt->list); |
| 432 | goto out; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); |
| 437 | out: |
| 438 | spin_unlock_bh(&ptype_lock); |
| 439 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 440 | EXPORT_SYMBOL(__dev_remove_pack); |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /** |
| 443 | * dev_remove_pack - remove packet handler |
| 444 | * @pt: packet type declaration |
| 445 | * |
| 446 | * Remove a protocol handler that was previously added to the kernel |
| 447 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed |
| 448 | * from the kernel lists and can be freed or reused once this function |
| 449 | * returns. |
| 450 | * |
| 451 | * This call sleeps to guarantee that no CPU is looking at the packet |
| 452 | * type after return. |
| 453 | */ |
| 454 | void dev_remove_pack(struct packet_type *pt) |
| 455 | { |
| 456 | __dev_remove_pack(pt); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | synchronize_net(); |
| 459 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 460 | EXPORT_SYMBOL(dev_remove_pack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
| 462 | /****************************************************************************** |
| 463 | |
| 464 | Device Boot-time Settings Routines |
| 465 | |
| 466 | *******************************************************************************/ |
| 467 | |
| 468 | /* Boot time configuration table */ |
| 469 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; |
| 470 | |
| 471 | /** |
| 472 | * netdev_boot_setup_add - add new setup entry |
| 473 | * @name: name of the device |
| 474 | * @map: configured settings for the device |
| 475 | * |
| 476 | * Adds new setup entry to the dev_boot_setup list. The function |
| 477 | * returns 0 on error and 1 on success. This is a generic routine to |
| 478 | * all netdevices. |
| 479 | */ |
| 480 | static int netdev_boot_setup_add(char *name, struct ifmap *map) |
| 481 | { |
| 482 | struct netdev_boot_setup *s; |
| 483 | int i; |
| 484 | |
| 485 | s = dev_boot_setup; |
| 486 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 487 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { |
| 488 | memset(s[i].name, 0, sizeof(s[i].name)); |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 489 | strlcpy(s[i].name, name, IFNAMSIZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
| 491 | break; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; |
| 496 | } |
| 497 | |
| 498 | /** |
| 499 | * netdev_boot_setup_check - check boot time settings |
| 500 | * @dev: the netdevice |
| 501 | * |
| 502 | * Check boot time settings for the device. |
| 503 | * The found settings are set for the device to be used |
| 504 | * later in the device probing. |
| 505 | * Returns 0 if no settings found, 1 if they are. |
| 506 | */ |
| 507 | int netdev_boot_setup_check(struct net_device *dev) |
| 508 | { |
| 509 | struct netdev_boot_setup *s = dev_boot_setup; |
| 510 | int i; |
| 511 | |
| 512 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { |
| 513 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && |
Wang Chen | 93b3cff | 2008-07-01 19:57:19 -0700 | [diff] [blame] | 514 | !strcmp(dev->name, s[i].name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | dev->irq = s[i].map.irq; |
| 516 | dev->base_addr = s[i].map.base_addr; |
| 517 | dev->mem_start = s[i].map.mem_start; |
| 518 | dev->mem_end = s[i].map.mem_end; |
| 519 | return 1; |
| 520 | } |
| 521 | } |
| 522 | return 0; |
| 523 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 524 | EXPORT_SYMBOL(netdev_boot_setup_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | |
| 527 | /** |
| 528 | * netdev_boot_base - get address from boot time settings |
| 529 | * @prefix: prefix for network device |
| 530 | * @unit: id for network device |
| 531 | * |
| 532 | * Check boot time settings for the base address of device. |
| 533 | * The found settings are set for the device to be used |
| 534 | * later in the device probing. |
| 535 | * Returns 0 if no settings found. |
| 536 | */ |
| 537 | unsigned long netdev_boot_base(const char *prefix, int unit) |
| 538 | { |
| 539 | const struct netdev_boot_setup *s = dev_boot_setup; |
| 540 | char name[IFNAMSIZ]; |
| 541 | int i; |
| 542 | |
| 543 | sprintf(name, "%s%d", prefix, unit); |
| 544 | |
| 545 | /* |
| 546 | * If device already registered then return base of 1 |
| 547 | * to indicate not to probe for this interface |
| 548 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 549 | if (__dev_get_by_name(&init_net, name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | return 1; |
| 551 | |
| 552 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) |
| 553 | if (!strcmp(name, s[i].name)) |
| 554 | return s[i].map.base_addr; |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Saves at boot time configured settings for any netdevice. |
| 560 | */ |
| 561 | int __init netdev_boot_setup(char *str) |
| 562 | { |
| 563 | int ints[5]; |
| 564 | struct ifmap map; |
| 565 | |
| 566 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 567 | if (!str || !*str) |
| 568 | return 0; |
| 569 | |
| 570 | /* Save settings */ |
| 571 | memset(&map, 0, sizeof(map)); |
| 572 | if (ints[0] > 0) |
| 573 | map.irq = ints[1]; |
| 574 | if (ints[0] > 1) |
| 575 | map.base_addr = ints[2]; |
| 576 | if (ints[0] > 2) |
| 577 | map.mem_start = ints[3]; |
| 578 | if (ints[0] > 3) |
| 579 | map.mem_end = ints[4]; |
| 580 | |
| 581 | /* Add new entry to the list */ |
| 582 | return netdev_boot_setup_add(str, &map); |
| 583 | } |
| 584 | |
| 585 | __setup("netdev=", netdev_boot_setup); |
| 586 | |
| 587 | /******************************************************************************* |
| 588 | |
| 589 | Device Interface Subroutines |
| 590 | |
| 591 | *******************************************************************************/ |
| 592 | |
| 593 | /** |
| 594 | * __dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 595 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | * @name: name to find |
| 597 | * |
| 598 | * Find an interface by name. Must be called under RTNL semaphore |
| 599 | * or @dev_base_lock. If the name is found a pointer to the device |
| 600 | * is returned. If the name is not found then %NULL is returned. The |
| 601 | * reference counters are not incremented so the caller must be |
| 602 | * careful with locks. |
| 603 | */ |
| 604 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 605 | 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] | 606 | { |
| 607 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 608 | struct net_device *dev; |
| 609 | struct hlist_head *head = dev_name_hash(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 611 | hlist_for_each_entry(dev, p, head, name_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 613 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | return NULL; |
| 616 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 617 | EXPORT_SYMBOL(__dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | /** |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 620 | * dev_get_by_name_rcu - find a device by its name |
| 621 | * @net: the applicable net namespace |
| 622 | * @name: name to find |
| 623 | * |
| 624 | * Find an interface by name. |
| 625 | * If the name is found a pointer to the device is returned. |
| 626 | * If the name is not found then %NULL is returned. |
| 627 | * The reference counters are not incremented so the caller must be |
| 628 | * careful with locks. The caller must hold RCU lock. |
| 629 | */ |
| 630 | |
| 631 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) |
| 632 | { |
| 633 | struct hlist_node *p; |
| 634 | struct net_device *dev; |
| 635 | struct hlist_head *head = dev_name_hash(net, name); |
| 636 | |
| 637 | hlist_for_each_entry_rcu(dev, p, head, name_hlist) |
| 638 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
| 639 | return dev; |
| 640 | |
| 641 | return NULL; |
| 642 | } |
| 643 | EXPORT_SYMBOL(dev_get_by_name_rcu); |
| 644 | |
| 645 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | * dev_get_by_name - find a device by its name |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 647 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | * @name: name to find |
| 649 | * |
| 650 | * Find an interface by name. This can be called from any |
| 651 | * context and does its own locking. The returned handle has |
| 652 | * the usage count incremented and the caller must use dev_put() to |
| 653 | * release it when it is no longer needed. %NULL is returned if no |
| 654 | * matching device is found. |
| 655 | */ |
| 656 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 657 | 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] | 658 | { |
| 659 | struct net_device *dev; |
| 660 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 661 | rcu_read_lock(); |
| 662 | dev = dev_get_by_name_rcu(net, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | if (dev) |
| 664 | dev_hold(dev); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 665 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | return dev; |
| 667 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 668 | EXPORT_SYMBOL(dev_get_by_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
| 670 | /** |
| 671 | * __dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 672 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | * @ifindex: index of device |
| 674 | * |
| 675 | * Search for an interface by index. Returns %NULL if the device |
| 676 | * is not found or a pointer to the device. The device has not |
| 677 | * had its reference counter increased so the caller must be careful |
| 678 | * about locking. The caller must hold either the RTNL semaphore |
| 679 | * or @dev_base_lock. |
| 680 | */ |
| 681 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 682 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
| 684 | struct hlist_node *p; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 685 | struct net_device *dev; |
| 686 | struct hlist_head *head = dev_index_hash(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 688 | hlist_for_each_entry(dev, p, head, index_hlist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | if (dev->ifindex == ifindex) |
| 690 | return dev; |
Eric Dumazet | 0bd8d53 | 2009-10-30 01:40:11 -0700 | [diff] [blame] | 691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | return NULL; |
| 693 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 694 | EXPORT_SYMBOL(__dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 696 | /** |
| 697 | * dev_get_by_index_rcu - find a device by its ifindex |
| 698 | * @net: the applicable net namespace |
| 699 | * @ifindex: index of device |
| 700 | * |
| 701 | * Search for an interface by index. Returns %NULL if the device |
| 702 | * is not found or a pointer to the device. The device has not |
| 703 | * had its reference counter increased so the caller must be careful |
| 704 | * about locking. The caller must hold RCU lock. |
| 705 | */ |
| 706 | |
| 707 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) |
| 708 | { |
| 709 | struct hlist_node *p; |
| 710 | struct net_device *dev; |
| 711 | struct hlist_head *head = dev_index_hash(net, ifindex); |
| 712 | |
| 713 | hlist_for_each_entry_rcu(dev, p, head, index_hlist) |
| 714 | if (dev->ifindex == ifindex) |
| 715 | return dev; |
| 716 | |
| 717 | return NULL; |
| 718 | } |
| 719 | EXPORT_SYMBOL(dev_get_by_index_rcu); |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
| 722 | /** |
| 723 | * dev_get_by_index - find a device by its ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 724 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | * @ifindex: index of device |
| 726 | * |
| 727 | * Search for an interface by index. Returns NULL if the device |
| 728 | * is not found or a pointer to the device. The device returned has |
| 729 | * had a reference added and the pointer is safe until the user calls |
| 730 | * dev_put to indicate they have finished with it. |
| 731 | */ |
| 732 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 733 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
| 735 | struct net_device *dev; |
| 736 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 737 | rcu_read_lock(); |
| 738 | dev = dev_get_by_index_rcu(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | if (dev) |
| 740 | dev_hold(dev); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 741 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | return dev; |
| 743 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 744 | EXPORT_SYMBOL(dev_get_by_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | /** |
| 747 | * dev_getbyhwaddr - find a device by its hardware address |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 748 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | * @type: media type of device |
| 750 | * @ha: hardware address |
| 751 | * |
| 752 | * Search for an interface by MAC address. Returns NULL if the device |
| 753 | * is not found or a pointer to the device. The caller must hold the |
| 754 | * rtnl semaphore. The returned device has not had its ref count increased |
| 755 | * and the caller must therefore be careful about locking |
| 756 | * |
| 757 | * BUGS: |
| 758 | * If the API was consistent this would be __dev_get_by_hwaddr |
| 759 | */ |
| 760 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 761 | struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | { |
| 763 | struct net_device *dev; |
| 764 | |
| 765 | ASSERT_RTNL(); |
| 766 | |
Denis V. Lunev | 81103a5 | 2007-12-12 10:47:38 -0800 | [diff] [blame] | 767 | for_each_netdev(net, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | if (dev->type == type && |
| 769 | !memcmp(dev->dev_addr, ha, dev->addr_len)) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 770 | return dev; |
| 771 | |
| 772 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
Jochen Friedrich | cf309e3 | 2005-09-22 04:44:55 -0300 | [diff] [blame] | 774 | EXPORT_SYMBOL(dev_getbyhwaddr); |
| 775 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 776 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 777 | { |
| 778 | struct net_device *dev; |
| 779 | |
| 780 | ASSERT_RTNL(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 781 | for_each_netdev(net, dev) |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 782 | if (dev->type == type) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 783 | return dev; |
| 784 | |
| 785 | return NULL; |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 786 | } |
Patrick McHardy | 4e9cac2 | 2007-05-03 03:28:13 -0700 | [diff] [blame] | 787 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
| 788 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 789 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 791 | struct net_device *dev, *ret = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
Eric Dumazet | 99fe3c3 | 2010-03-18 11:27:25 +0000 | [diff] [blame] | 793 | rcu_read_lock(); |
| 794 | for_each_netdev_rcu(net, dev) |
| 795 | if (dev->type == type) { |
| 796 | dev_hold(dev); |
| 797 | ret = dev; |
| 798 | break; |
| 799 | } |
| 800 | rcu_read_unlock(); |
| 801 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
| 804 | |
| 805 | /** |
| 806 | * dev_get_by_flags - find any device with given flags |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 807 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | * @if_flags: IFF_* values |
| 809 | * @mask: bitmask of bits in if_flags to check |
| 810 | * |
| 811 | * Search for any interface with the given flags. Returns NULL if a device |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 812 | * is not found or a pointer to the device. The device returned has |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | * had a reference added and the pointer is safe until the user calls |
| 814 | * dev_put to indicate they have finished with it. |
| 815 | */ |
| 816 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 817 | struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags, |
| 818 | unsigned short mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 820 | struct net_device *dev, *ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 822 | ret = NULL; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 823 | rcu_read_lock(); |
| 824 | for_each_netdev_rcu(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | if (((dev->flags ^ if_flags) & mask) == 0) { |
| 826 | dev_hold(dev); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 827 | ret = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | break; |
| 829 | } |
| 830 | } |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 831 | rcu_read_unlock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 832 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 834 | EXPORT_SYMBOL(dev_get_by_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
| 836 | /** |
| 837 | * dev_valid_name - check if name is okay for network device |
| 838 | * @name: name string |
| 839 | * |
| 840 | * Network device names need to be valid file names to |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 841 | * to allow sysfs to work. We also disallow any kind of |
| 842 | * whitespace. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | */ |
Mitch Williams | c2373ee | 2005-11-09 10:34:45 -0800 | [diff] [blame] | 844 | int dev_valid_name(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | { |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 846 | if (*name == '\0') |
| 847 | return 0; |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 848 | if (strlen(name) >= IFNAMSIZ) |
| 849 | return 0; |
David S. Miller | c7fa9d1 | 2006-08-15 16:34:13 -0700 | [diff] [blame] | 850 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
| 851 | return 0; |
| 852 | |
| 853 | while (*name) { |
| 854 | if (*name == '/' || isspace(*name)) |
| 855 | return 0; |
| 856 | name++; |
| 857 | } |
| 858 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 860 | EXPORT_SYMBOL(dev_valid_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
| 862 | /** |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 863 | * __dev_alloc_name - allocate a name for a device |
| 864 | * @net: network namespace to allocate the device name in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | * @name: name format string |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 866 | * @buf: scratch buffer and result name string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | * |
| 868 | * 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] | 869 | * id. It scans list of devices to build up a free map, then chooses |
| 870 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 871 | * while allocating the name and adding the device in order to avoid |
| 872 | * duplicates. |
| 873 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 874 | * Returns the number of the unit assigned or a negative errno code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | */ |
| 876 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 877 | 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] | 878 | { |
| 879 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | const char *p; |
| 881 | const int max_netdevices = 8*PAGE_SIZE; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 882 | unsigned long *inuse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | struct net_device *d; |
| 884 | |
| 885 | p = strnchr(name, IFNAMSIZ-1, '%'); |
| 886 | if (p) { |
| 887 | /* |
| 888 | * Verify the string as this thing may have come from |
| 889 | * the user. There must be either one "%d" and no other "%" |
| 890 | * characters. |
| 891 | */ |
| 892 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 893 | return -EINVAL; |
| 894 | |
| 895 | /* Use one page as a bit array of possible slots */ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 896 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (!inuse) |
| 898 | return -ENOMEM; |
| 899 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 900 | for_each_netdev(net, d) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | if (!sscanf(d->name, name, &i)) |
| 902 | continue; |
| 903 | if (i < 0 || i >= max_netdevices) |
| 904 | continue; |
| 905 | |
| 906 | /* avoid cases where sscanf is not exact inverse of printf */ |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 907 | snprintf(buf, IFNAMSIZ, name, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
| 909 | set_bit(i, inuse); |
| 910 | } |
| 911 | |
| 912 | i = find_first_zero_bit(inuse, max_netdevices); |
| 913 | free_page((unsigned long) inuse); |
| 914 | } |
| 915 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 916 | if (buf != name) |
| 917 | snprintf(buf, IFNAMSIZ, name, i); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 918 | if (!__dev_get_by_name(net, buf)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | /* It is possible to run out of possible slots |
| 922 | * when the name is long and there isn't enough space left |
| 923 | * for the digits, or if all bits are used. |
| 924 | */ |
| 925 | return -ENFILE; |
| 926 | } |
| 927 | |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 928 | /** |
| 929 | * dev_alloc_name - allocate a name for a device |
| 930 | * @dev: device |
| 931 | * @name: name format string |
| 932 | * |
| 933 | * Passed a format string - eg "lt%d" it will try and find a suitable |
| 934 | * id. It scans list of devices to build up a free map, then chooses |
| 935 | * the first empty slot. The caller must hold the dev_base or rtnl lock |
| 936 | * while allocating the name and adding the device in order to avoid |
| 937 | * duplicates. |
| 938 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
| 939 | * Returns the number of the unit assigned or a negative errno code. |
| 940 | */ |
| 941 | |
| 942 | int dev_alloc_name(struct net_device *dev, const char *name) |
| 943 | { |
| 944 | char buf[IFNAMSIZ]; |
| 945 | struct net *net; |
| 946 | int ret; |
| 947 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 948 | BUG_ON(!dev_net(dev)); |
| 949 | net = dev_net(dev); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 950 | ret = __dev_alloc_name(net, name, buf); |
| 951 | if (ret >= 0) |
| 952 | strlcpy(dev->name, buf, IFNAMSIZ); |
| 953 | return ret; |
| 954 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 955 | EXPORT_SYMBOL(dev_alloc_name); |
Eric W. Biederman | b267b17 | 2007-09-12 13:48:45 +0200 | [diff] [blame] | 956 | |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 957 | static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt) |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 958 | { |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 959 | struct net *net; |
| 960 | |
| 961 | BUG_ON(!dev_net(dev)); |
| 962 | net = dev_net(dev); |
| 963 | |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 964 | if (!dev_valid_name(name)) |
| 965 | return -EINVAL; |
| 966 | |
| 967 | if (fmt && strchr(name, '%')) |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 968 | return dev_alloc_name(dev, name); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 969 | else if (__dev_get_by_name(net, name)) |
| 970 | return -EEXIST; |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 971 | else if (dev->name != name) |
| 972 | strlcpy(dev->name, name, IFNAMSIZ); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 973 | |
| 974 | return 0; |
| 975 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
| 977 | /** |
| 978 | * dev_change_name - change name of a device |
| 979 | * @dev: device |
| 980 | * @newname: name (or format string) must be at least IFNAMSIZ |
| 981 | * |
| 982 | * Change name of a device, can pass format strings "eth%d". |
| 983 | * for wildcarding. |
| 984 | */ |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 985 | int dev_change_name(struct net_device *dev, const char *newname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 987 | char oldname[IFNAMSIZ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | int err = 0; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 989 | int ret; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 990 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
| 992 | ASSERT_RTNL(); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 993 | BUG_ON(!dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 995 | net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | if (dev->flags & IFF_UP) |
| 997 | return -EBUSY; |
| 998 | |
Stephen Hemminger | c8d90dc | 2007-10-26 03:53:42 -0700 | [diff] [blame] | 999 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) |
| 1000 | return 0; |
| 1001 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1002 | memcpy(oldname, dev->name, IFNAMSIZ); |
| 1003 | |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 1004 | err = dev_get_valid_name(dev, newname, 1); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 1005 | if (err < 0) |
| 1006 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1008 | rollback: |
Eric W. Biederman | a1b3f59 | 2010-05-04 17:36:49 -0700 | [diff] [blame] | 1009 | ret = device_rename(&dev->dev, dev->name); |
| 1010 | if (ret) { |
| 1011 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1012 | return ret; |
Stephen Hemminger | dcc9977 | 2008-05-14 22:33:38 -0700 | [diff] [blame] | 1013 | } |
Herbert Xu | 7f988ea | 2007-07-30 16:35:46 -0700 | [diff] [blame] | 1014 | |
| 1015 | write_lock_bh(&dev_base_lock); |
Eric W. Biederman | 9274982 | 2007-04-03 00:07:30 -0600 | [diff] [blame] | 1016 | hlist_del(&dev->name_hlist); |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1017 | write_unlock_bh(&dev_base_lock); |
| 1018 | |
| 1019 | synchronize_rcu(); |
| 1020 | |
| 1021 | write_lock_bh(&dev_base_lock); |
| 1022 | 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] | 1023 | write_unlock_bh(&dev_base_lock); |
| 1024 | |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1025 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1026 | ret = notifier_to_errno(ret); |
| 1027 | |
| 1028 | if (ret) { |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1029 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
| 1030 | if (err >= 0) { |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1031 | err = ret; |
| 1032 | memcpy(dev->name, oldname, IFNAMSIZ); |
| 1033 | goto rollback; |
Eric Dumazet | 91e9c07b | 2009-11-15 23:30:24 +0000 | [diff] [blame] | 1034 | } else { |
| 1035 | printk(KERN_ERR |
| 1036 | "%s: name change rollback failed: %d.\n", |
| 1037 | dev->name, ret); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1038 | } |
| 1039 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | |
| 1041 | return err; |
| 1042 | } |
| 1043 | |
| 1044 | /** |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1045 | * dev_set_alias - change ifalias of a device |
| 1046 | * @dev: device |
| 1047 | * @alias: name up to IFALIASZ |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 1048 | * @len: limit of bytes to copy from info |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1049 | * |
| 1050 | * Set ifalias for a device, |
| 1051 | */ |
| 1052 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) |
| 1053 | { |
| 1054 | ASSERT_RTNL(); |
| 1055 | |
| 1056 | if (len >= IFALIASZ) |
| 1057 | return -EINVAL; |
| 1058 | |
Oliver Hartkopp | 96ca4a2 | 2008-09-23 21:23:19 -0700 | [diff] [blame] | 1059 | if (!len) { |
| 1060 | if (dev->ifalias) { |
| 1061 | kfree(dev->ifalias); |
| 1062 | dev->ifalias = NULL; |
| 1063 | } |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1067 | dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
Stephen Hemminger | 0b815a1 | 2008-09-22 21:28:11 -0700 | [diff] [blame] | 1068 | if (!dev->ifalias) |
| 1069 | return -ENOMEM; |
| 1070 | |
| 1071 | strlcpy(dev->ifalias, alias, len+1); |
| 1072 | return len; |
| 1073 | } |
| 1074 | |
| 1075 | |
| 1076 | /** |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 1077 | * netdev_features_change - device changes features |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1078 | * @dev: device to cause notification |
| 1079 | * |
| 1080 | * Called to indicate a device has changed features. |
| 1081 | */ |
| 1082 | void netdev_features_change(struct net_device *dev) |
| 1083 | { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1084 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
Stephen Hemminger | d8a33ac | 2005-05-29 14:13:47 -0700 | [diff] [blame] | 1085 | } |
| 1086 | EXPORT_SYMBOL(netdev_features_change); |
| 1087 | |
| 1088 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | * netdev_state_change - device changes state |
| 1090 | * @dev: device to cause notification |
| 1091 | * |
| 1092 | * Called to indicate a device has changed state. This function calls |
| 1093 | * the notifier chains for netdev_chain and sends a NEWLINK message |
| 1094 | * to the routing socket. |
| 1095 | */ |
| 1096 | void netdev_state_change(struct net_device *dev) |
| 1097 | { |
| 1098 | if (dev->flags & IFF_UP) { |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1099 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
| 1101 | } |
| 1102 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1103 | EXPORT_SYMBOL(netdev_state_change); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | |
Jiri Pirko | 3ca5b40 | 2010-03-10 10:29:35 +0000 | [diff] [blame] | 1105 | int netdev_bonding_change(struct net_device *dev, unsigned long event) |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1106 | { |
Jiri Pirko | 3ca5b40 | 2010-03-10 10:29:35 +0000 | [diff] [blame] | 1107 | return call_netdevice_notifiers(event, dev); |
Or Gerlitz | c1da4ac | 2008-06-13 18:12:00 -0700 | [diff] [blame] | 1108 | } |
| 1109 | EXPORT_SYMBOL(netdev_bonding_change); |
| 1110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | /** |
| 1112 | * dev_load - load a network module |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1113 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | * @name: name of interface |
| 1115 | * |
| 1116 | * If a network interface is not present and the process has suitable |
| 1117 | * privileges this function loads the module. If module loading is not |
| 1118 | * available in this kernel then it becomes a nop. |
| 1119 | */ |
| 1120 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1121 | void dev_load(struct net *net, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1123 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
Eric Dumazet | 72c9528 | 2009-10-30 07:11:27 +0000 | [diff] [blame] | 1125 | rcu_read_lock(); |
| 1126 | dev = dev_get_by_name_rcu(net, name); |
| 1127 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | |
Eric Paris | a8f80e8 | 2009-08-13 09:44:51 -0400 | [diff] [blame] | 1129 | if (!dev && capable(CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | request_module("%s", name); |
| 1131 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1132 | EXPORT_SYMBOL(dev_load); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1134 | static int __dev_open(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1136 | const struct net_device_ops *ops = dev->netdev_ops; |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1137 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1139 | ASSERT_RTNL(); |
| 1140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | * Is it even present? |
| 1143 | */ |
| 1144 | if (!netif_device_present(dev)) |
| 1145 | return -ENODEV; |
| 1146 | |
Johannes Berg | 3b8bcfd | 2009-05-30 01:39:53 +0200 | [diff] [blame] | 1147 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
| 1148 | ret = notifier_to_errno(ret); |
| 1149 | if (ret) |
| 1150 | return ret; |
| 1151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | /* |
| 1153 | * Call device private open method |
| 1154 | */ |
| 1155 | set_bit(__LINK_STATE_START, &dev->state); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1156 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1157 | if (ops->ndo_validate_addr) |
| 1158 | ret = ops->ndo_validate_addr(dev); |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1159 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1160 | if (!ret && ops->ndo_open) |
| 1161 | ret = ops->ndo_open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1163 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | * If it went open OK then: |
| 1165 | */ |
| 1166 | |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1167 | if (ret) |
| 1168 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1169 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | /* |
| 1171 | * Set the flags. |
| 1172 | */ |
| 1173 | dev->flags |= IFF_UP; |
| 1174 | |
| 1175 | /* |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1176 | * Enable NET_DMA |
| 1177 | */ |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1178 | net_dmaengine_get(); |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1179 | |
| 1180 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | * Initialize multicasting status |
| 1182 | */ |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 1183 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
| 1185 | /* |
| 1186 | * Wakeup transmit queue engine |
| 1187 | */ |
| 1188 | dev_activate(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | } |
Jeff Garzik | bada339 | 2007-10-23 20:19:37 -0700 | [diff] [blame] | 1190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | return ret; |
| 1192 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1193 | |
| 1194 | /** |
| 1195 | * dev_open - prepare an interface for use. |
| 1196 | * @dev: device to open |
| 1197 | * |
| 1198 | * Takes a device from down to up state. The device's private open |
| 1199 | * function is invoked and then the multicast lists are loaded. Finally |
| 1200 | * the device is moved into the up state and a %NETDEV_UP message is |
| 1201 | * sent to the netdev notifier chain. |
| 1202 | * |
| 1203 | * Calling this function on an active interface is a nop. On a failure |
| 1204 | * a negative errno code is returned. |
| 1205 | */ |
| 1206 | int dev_open(struct net_device *dev) |
| 1207 | { |
| 1208 | int ret; |
| 1209 | |
| 1210 | /* |
| 1211 | * Is it already up? |
| 1212 | */ |
| 1213 | if (dev->flags & IFF_UP) |
| 1214 | return 0; |
| 1215 | |
| 1216 | /* |
| 1217 | * Open device |
| 1218 | */ |
| 1219 | ret = __dev_open(dev); |
| 1220 | if (ret < 0) |
| 1221 | return ret; |
| 1222 | |
| 1223 | /* |
| 1224 | * ... and announce new interface. |
| 1225 | */ |
| 1226 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1227 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 1228 | |
| 1229 | return ret; |
| 1230 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1231 | EXPORT_SYMBOL(dev_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1233 | static int __dev_close(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1235 | const struct net_device_ops *ops = dev->netdev_ops; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1236 | |
Ben Hutchings | e46b66b | 2008-05-08 02:53:17 -0700 | [diff] [blame] | 1237 | ASSERT_RTNL(); |
David S. Miller | 9d5010d | 2007-09-12 14:33:25 +0200 | [diff] [blame] | 1238 | might_sleep(); |
| 1239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | /* |
| 1241 | * Tell people we are going down, so that they can |
| 1242 | * prepare to death, when device is still operating. |
| 1243 | */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 1244 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | clear_bit(__LINK_STATE_START, &dev->state); |
| 1247 | |
| 1248 | /* Synchronize to scheduled poll. We cannot touch poll list, |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1249 | * it can be even on different cpu. So just clear netif_running(). |
| 1250 | * |
| 1251 | * dev->stop() will invoke napi_disable() on all of it's |
| 1252 | * napi_struct instances on this device. |
| 1253 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
Matti Linnanvuori | d8b2a4d | 2008-02-12 23:10:11 -0800 | [diff] [blame] | 1256 | dev_deactivate(dev); |
| 1257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | /* |
| 1259 | * Call the device specific close. This cannot fail. |
| 1260 | * Only if device is UP |
| 1261 | * |
| 1262 | * We allow it to be called even after a DETACH hot-plug |
| 1263 | * event. |
| 1264 | */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 1265 | if (ops->ndo_stop) |
| 1266 | ops->ndo_stop(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | |
| 1268 | /* |
| 1269 | * Device is now down. |
| 1270 | */ |
| 1271 | |
| 1272 | dev->flags &= ~IFF_UP; |
| 1273 | |
| 1274 | /* |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1275 | * Shutdown NET_DMA |
| 1276 | */ |
David S. Miller | b4bd07c | 2009-02-06 22:06:43 -0800 | [diff] [blame] | 1277 | net_dmaengine_put(); |
Dan Williams | 649274d | 2009-01-11 00:20:39 -0800 | [diff] [blame] | 1278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | return 0; |
| 1280 | } |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 1281 | |
| 1282 | /** |
| 1283 | * dev_close - shutdown an interface. |
| 1284 | * @dev: device to shutdown |
| 1285 | * |
| 1286 | * This function moves an active device into down state. A |
| 1287 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device |
| 1288 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier |
| 1289 | * chain. |
| 1290 | */ |
| 1291 | int dev_close(struct net_device *dev) |
| 1292 | { |
| 1293 | if (!(dev->flags & IFF_UP)) |
| 1294 | return 0; |
| 1295 | |
| 1296 | __dev_close(dev); |
| 1297 | |
| 1298 | /* |
| 1299 | * Tell people we are down |
| 1300 | */ |
| 1301 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| 1302 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 1303 | |
| 1304 | return 0; |
| 1305 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1306 | EXPORT_SYMBOL(dev_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | |
| 1308 | |
Ben Hutchings | 0187bdf | 2008-06-19 16:15:47 -0700 | [diff] [blame] | 1309 | /** |
| 1310 | * dev_disable_lro - disable Large Receive Offload on a device |
| 1311 | * @dev: device |
| 1312 | * |
| 1313 | * Disable Large Receive Offload (LRO) on a net device. Must be |
| 1314 | * called under RTNL. This is needed if received packets may be |
| 1315 | * forwarded to another interface. |
| 1316 | */ |
| 1317 | void dev_disable_lro(struct net_device *dev) |
| 1318 | { |
| 1319 | if (dev->ethtool_ops && dev->ethtool_ops->get_flags && |
| 1320 | dev->ethtool_ops->set_flags) { |
| 1321 | u32 flags = dev->ethtool_ops->get_flags(dev); |
| 1322 | if (flags & ETH_FLAG_LRO) { |
| 1323 | flags &= ~ETH_FLAG_LRO; |
| 1324 | dev->ethtool_ops->set_flags(dev, flags); |
| 1325 | } |
| 1326 | } |
| 1327 | WARN_ON(dev->features & NETIF_F_LRO); |
| 1328 | } |
| 1329 | EXPORT_SYMBOL(dev_disable_lro); |
| 1330 | |
| 1331 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1332 | static int dev_boot_phase = 1; |
| 1333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | /* |
| 1335 | * Device change register/unregister. These are not inline or static |
| 1336 | * as we export them to the world. |
| 1337 | */ |
| 1338 | |
| 1339 | /** |
| 1340 | * register_netdevice_notifier - register a network notifier block |
| 1341 | * @nb: notifier |
| 1342 | * |
| 1343 | * Register a notifier to be called when network device events occur. |
| 1344 | * The notifier passed is linked into the kernel structures and must |
| 1345 | * not be reused until it has been unregistered. A negative errno code |
| 1346 | * is returned on a failure. |
| 1347 | * |
| 1348 | * When registered all registration and up events are replayed |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1349 | * to the new notifier to allow device to have a race free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | * view of the network device list. |
| 1351 | */ |
| 1352 | |
| 1353 | int register_netdevice_notifier(struct notifier_block *nb) |
| 1354 | { |
| 1355 | struct net_device *dev; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1356 | struct net_device *last; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1357 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | int err; |
| 1359 | |
| 1360 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1361 | err = raw_notifier_chain_register(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1362 | if (err) |
| 1363 | goto unlock; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1364 | if (dev_boot_phase) |
| 1365 | goto unlock; |
| 1366 | for_each_net(net) { |
| 1367 | for_each_netdev(net, dev) { |
| 1368 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); |
| 1369 | err = notifier_to_errno(err); |
| 1370 | if (err) |
| 1371 | goto rollback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1373 | if (!(dev->flags & IFF_UP)) |
| 1374 | continue; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1375 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1376 | nb->notifier_call(nb, NETDEV_UP, dev); |
| 1377 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1379 | |
| 1380 | unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | rtnl_unlock(); |
| 1382 | return err; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1383 | |
| 1384 | rollback: |
| 1385 | last = dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1386 | for_each_net(net) { |
| 1387 | for_each_netdev(net, dev) { |
| 1388 | if (dev == last) |
| 1389 | break; |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1390 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1391 | if (dev->flags & IFF_UP) { |
| 1392 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); |
| 1393 | nb->notifier_call(nb, NETDEV_DOWN, dev); |
| 1394 | } |
| 1395 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 1396 | nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1397 | } |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1398 | } |
Pavel Emelyanov | c67625a | 2007-11-14 15:53:16 -0800 | [diff] [blame] | 1399 | |
| 1400 | raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 1401 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1403 | EXPORT_SYMBOL(register_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | |
| 1405 | /** |
| 1406 | * unregister_netdevice_notifier - unregister a network notifier block |
| 1407 | * @nb: notifier |
| 1408 | * |
| 1409 | * Unregister a notifier previously registered by |
| 1410 | * register_netdevice_notifier(). The notifier is unlinked into the |
| 1411 | * kernel structures and may then be reused. A negative errno code |
| 1412 | * is returned on a failure. |
| 1413 | */ |
| 1414 | |
| 1415 | int unregister_netdevice_notifier(struct notifier_block *nb) |
| 1416 | { |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1417 | int err; |
| 1418 | |
| 1419 | rtnl_lock(); |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1420 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
Herbert Xu | 9f51495 | 2006-03-25 01:24:25 -0800 | [diff] [blame] | 1421 | rtnl_unlock(); |
| 1422 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1424 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | |
| 1426 | /** |
| 1427 | * call_netdevice_notifiers - call all network notifier blocks |
| 1428 | * @val: value passed unmodified to notifier function |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1429 | * @dev: net_device pointer passed unmodified to notifier function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | * |
| 1431 | * Call all network notifier blocks. Parameters and return value |
Alan Stern | f07d5b9 | 2006-05-09 15:23:03 -0700 | [diff] [blame] | 1432 | * are as for raw_notifier_call_chain(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | */ |
| 1434 | |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1435 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | { |
Jiri Pirko | ab93047 | 2010-04-20 01:45:37 -0700 | [diff] [blame] | 1437 | ASSERT_RTNL(); |
Eric W. Biederman | ad7379d | 2007-09-16 15:33:32 -0700 | [diff] [blame] | 1438 | return raw_notifier_call_chain(&netdev_chain, val, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | } |
| 1440 | |
| 1441 | /* When > 0 there are consumers of rx skb time stamps */ |
| 1442 | static atomic_t netstamp_needed = ATOMIC_INIT(0); |
| 1443 | |
| 1444 | void net_enable_timestamp(void) |
| 1445 | { |
| 1446 | atomic_inc(&netstamp_needed); |
| 1447 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1448 | EXPORT_SYMBOL(net_enable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
| 1450 | void net_disable_timestamp(void) |
| 1451 | { |
| 1452 | atomic_dec(&netstamp_needed); |
| 1453 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1454 | EXPORT_SYMBOL(net_disable_timestamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1456 | static inline void net_timestamp_set(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | { |
| 1458 | if (atomic_read(&netstamp_needed)) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1459 | __net_timestamp(skb); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1460 | else |
| 1461 | skb->tstamp.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | } |
| 1463 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1464 | static inline void net_timestamp_check(struct sk_buff *skb) |
| 1465 | { |
| 1466 | if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed)) |
| 1467 | __net_timestamp(skb); |
| 1468 | } |
| 1469 | |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1470 | /** |
| 1471 | * dev_forward_skb - loopback an skb to another netif |
| 1472 | * |
| 1473 | * @dev: destination network device |
| 1474 | * @skb: buffer to forward |
| 1475 | * |
| 1476 | * return values: |
| 1477 | * NET_RX_SUCCESS (no congestion) |
Eric Dumazet | 6ec8256 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1478 | * NET_RX_DROP (packet was dropped, but freed) |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1479 | * |
| 1480 | * dev_forward_skb can be used for injecting an skb from the |
| 1481 | * start_xmit function of one device into the receive queue |
| 1482 | * of another device. |
| 1483 | * |
| 1484 | * The receiving device may be in another namespace, so |
| 1485 | * we have to clear all information in the skb that could |
| 1486 | * impact namespace isolation. |
| 1487 | */ |
| 1488 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
| 1489 | { |
| 1490 | skb_orphan(skb); |
| 1491 | |
Eric Dumazet | 6ec8256 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1492 | if (!(dev->flags & IFF_UP) || |
| 1493 | (skb->len > (dev->mtu + dev->hard_header_len))) { |
| 1494 | kfree_skb(skb); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1495 | return NET_RX_DROP; |
Eric Dumazet | 6ec8256 | 2010-05-06 00:53:53 -0700 | [diff] [blame] | 1496 | } |
Arnd Bergmann | 8a83a00 | 2010-01-30 12:23:03 +0000 | [diff] [blame] | 1497 | skb_set_dev(skb, dev); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1498 | skb->tstamp.tv64 = 0; |
| 1499 | skb->pkt_type = PACKET_HOST; |
| 1500 | skb->protocol = eth_type_trans(skb, dev); |
Arnd Bergmann | 4454096 | 2009-11-26 06:07:08 +0000 | [diff] [blame] | 1501 | return netif_rx(skb); |
| 1502 | } |
| 1503 | EXPORT_SYMBOL_GPL(dev_forward_skb); |
| 1504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | /* |
| 1506 | * Support routine. Sends outgoing frames to any network |
| 1507 | * taps currently in use. |
| 1508 | */ |
| 1509 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1510 | 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] | 1511 | { |
| 1512 | struct packet_type *ptype; |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1513 | |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 1514 | #ifdef CONFIG_NET_CLS_ACT |
| 1515 | if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS))) |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1516 | net_timestamp_set(skb); |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 1517 | #else |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 1518 | net_timestamp_set(skb); |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 1519 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | |
| 1521 | rcu_read_lock(); |
| 1522 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 1523 | /* Never send packets back to the socket |
| 1524 | * they originated from - MvS (miquels@drinkel.ow.org) |
| 1525 | */ |
| 1526 | if ((ptype->dev == dev || !ptype->dev) && |
| 1527 | (ptype->af_packet_priv == NULL || |
| 1528 | (struct sock *)ptype->af_packet_priv != skb->sk)) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1529 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | if (!skb2) |
| 1531 | break; |
| 1532 | |
| 1533 | /* skb->nh should be correctly |
| 1534 | set by sender, so that the second statement is |
| 1535 | just protection against buggy protocols. |
| 1536 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1537 | skb_reset_mac_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1539 | if (skb_network_header(skb2) < skb2->data || |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1540 | skb2->network_header > skb2->tail) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | if (net_ratelimit()) |
| 1542 | printk(KERN_CRIT "protocol %04x is " |
| 1543 | "buggy, dev %s\n", |
| 1544 | skb2->protocol, dev->name); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1545 | skb_reset_network_header(skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | } |
| 1547 | |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1548 | skb2->transport_header = skb2->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | skb2->pkt_type = PACKET_OUTGOING; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 1550 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | } |
| 1552 | } |
| 1553 | rcu_read_unlock(); |
| 1554 | } |
| 1555 | |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1556 | |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1557 | static inline void __netif_reschedule(struct Qdisc *q) |
| 1558 | { |
| 1559 | struct softnet_data *sd; |
| 1560 | unsigned long flags; |
| 1561 | |
| 1562 | local_irq_save(flags); |
| 1563 | sd = &__get_cpu_var(softnet_data); |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 1564 | q->next_sched = NULL; |
| 1565 | *sd->output_queue_tailp = q; |
| 1566 | sd->output_queue_tailp = &q->next_sched; |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1567 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1568 | local_irq_restore(flags); |
| 1569 | } |
| 1570 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 1571 | void __netif_schedule(struct Qdisc *q) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1572 | { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 1573 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) |
| 1574 | __netif_reschedule(q); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1575 | } |
| 1576 | EXPORT_SYMBOL(__netif_schedule); |
| 1577 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1578 | void dev_kfree_skb_irq(struct sk_buff *skb) |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1579 | { |
Eric Dumazet | 15e83ed | 2010-05-19 23:16:03 +0000 | [diff] [blame] | 1580 | if (!skb->destructor) |
| 1581 | dev_kfree_skb(skb); |
| 1582 | else if (atomic_dec_and_test(&skb->users)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1583 | struct softnet_data *sd; |
| 1584 | unsigned long flags; |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1585 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1586 | local_irq_save(flags); |
| 1587 | sd = &__get_cpu_var(softnet_data); |
| 1588 | skb->next = sd->completion_queue; |
| 1589 | sd->completion_queue = skb; |
| 1590 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 1591 | local_irq_restore(flags); |
| 1592 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1593 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1594 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1595 | |
| 1596 | void dev_kfree_skb_any(struct sk_buff *skb) |
| 1597 | { |
| 1598 | if (in_irq() || irqs_disabled()) |
| 1599 | dev_kfree_skb_irq(skb); |
| 1600 | else |
| 1601 | dev_kfree_skb(skb); |
| 1602 | } |
| 1603 | EXPORT_SYMBOL(dev_kfree_skb_any); |
| 1604 | |
| 1605 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1606 | /** |
| 1607 | * netif_device_detach - mark device as removed |
| 1608 | * @dev: network device |
| 1609 | * |
| 1610 | * Mark device as removed from system and therefore no longer available. |
| 1611 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1612 | void netif_device_detach(struct net_device *dev) |
| 1613 | { |
| 1614 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1615 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1616 | netif_tx_stop_all_queues(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1617 | } |
| 1618 | } |
| 1619 | EXPORT_SYMBOL(netif_device_detach); |
| 1620 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1621 | /** |
| 1622 | * netif_device_attach - mark device as attached |
| 1623 | * @dev: network device |
| 1624 | * |
| 1625 | * Mark device as attached from system and restart if needed. |
| 1626 | */ |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1627 | void netif_device_attach(struct net_device *dev) |
| 1628 | { |
| 1629 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && |
| 1630 | netif_running(dev)) { |
Alexander Duyck | d543103 | 2009-04-08 13:15:22 +0000 | [diff] [blame] | 1631 | netif_tx_wake_all_queues(dev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1632 | __netdev_watchdog_up(dev); |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1633 | } |
| 1634 | } |
| 1635 | EXPORT_SYMBOL(netif_device_attach); |
| 1636 | |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 1637 | static bool can_checksum_protocol(unsigned long features, __be16 protocol) |
| 1638 | { |
| 1639 | return ((features & NETIF_F_GEN_CSUM) || |
| 1640 | ((features & NETIF_F_IP_CSUM) && |
| 1641 | protocol == htons(ETH_P_IP)) || |
| 1642 | ((features & NETIF_F_IPV6_CSUM) && |
Yi Zou | 1c8dbcf | 2009-02-27 14:06:54 -0800 | [diff] [blame] | 1643 | protocol == htons(ETH_P_IPV6)) || |
| 1644 | ((features & NETIF_F_FCOE_CRC) && |
| 1645 | protocol == htons(ETH_P_FCOE))); |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 1646 | } |
| 1647 | |
| 1648 | static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb) |
| 1649 | { |
| 1650 | if (can_checksum_protocol(dev->features, skb->protocol)) |
| 1651 | return true; |
| 1652 | |
| 1653 | if (skb->protocol == htons(ETH_P_8021Q)) { |
| 1654 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
| 1655 | if (can_checksum_protocol(dev->features & dev->vlan_features, |
| 1656 | veh->h_vlan_encapsulated_proto)) |
| 1657 | return true; |
| 1658 | } |
| 1659 | |
| 1660 | return false; |
| 1661 | } |
Denis Vlasenko | 5607943 | 2006-03-29 15:57:29 -0800 | [diff] [blame] | 1662 | |
Arnd Bergmann | 8a83a00 | 2010-01-30 12:23:03 +0000 | [diff] [blame] | 1663 | /** |
| 1664 | * skb_dev_set -- assign a new device to a buffer |
| 1665 | * @skb: buffer for the new device |
| 1666 | * @dev: network device |
| 1667 | * |
| 1668 | * If an skb is owned by a device already, we have to reset |
| 1669 | * all data private to the namespace a device belongs to |
| 1670 | * before assigning it a new device. |
| 1671 | */ |
| 1672 | #ifdef CONFIG_NET_NS |
| 1673 | void skb_set_dev(struct sk_buff *skb, struct net_device *dev) |
| 1674 | { |
| 1675 | skb_dst_drop(skb); |
| 1676 | if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) { |
| 1677 | secpath_reset(skb); |
| 1678 | nf_reset(skb); |
| 1679 | skb_init_secmark(skb); |
| 1680 | skb->mark = 0; |
| 1681 | skb->priority = 0; |
| 1682 | skb->nf_trace = 0; |
| 1683 | skb->ipvs_property = 0; |
| 1684 | #ifdef CONFIG_NET_SCHED |
| 1685 | skb->tc_index = 0; |
| 1686 | #endif |
| 1687 | } |
| 1688 | skb->dev = dev; |
| 1689 | } |
| 1690 | EXPORT_SYMBOL(skb_set_dev); |
| 1691 | #endif /* CONFIG_NET_NS */ |
| 1692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | /* |
| 1694 | * Invalidate hardware checksum when packet is to be mangled, and |
| 1695 | * complete checksum manually on outgoing path. |
| 1696 | */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1697 | int skb_checksum_help(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | { |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 1699 | __wsum csum; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 1700 | int ret = 0, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1702 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1703 | goto out_set_summed; |
| 1704 | |
| 1705 | if (unlikely(skb_shinfo(skb)->gso_size)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1706 | /* Let GSO fix up the checksum. */ |
| 1707 | goto out_set_summed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | } |
| 1709 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1710 | offset = skb->csum_start - skb_headroom(skb); |
| 1711 | BUG_ON(offset >= skb_headlen(skb)); |
| 1712 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 1713 | |
| 1714 | offset += skb->csum_offset; |
| 1715 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); |
| 1716 | |
| 1717 | if (skb_cloned(skb) && |
| 1718 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
| 1720 | if (ret) |
| 1721 | goto out; |
| 1722 | } |
| 1723 | |
Herbert Xu | a030847 | 2007-10-15 01:47:15 -0700 | [diff] [blame] | 1724 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1725 | out_set_summed: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | skb->ip_summed = CHECKSUM_NONE; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1727 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | return ret; |
| 1729 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1730 | EXPORT_SYMBOL(skb_checksum_help); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1732 | /** |
| 1733 | * skb_gso_segment - Perform segmentation on skb. |
| 1734 | * @skb: buffer to segment |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1735 | * @features: features for the output path (see dev->features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1736 | * |
| 1737 | * This function segments the given skb and returns a list of segments. |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1738 | * |
| 1739 | * It may return NULL if the skb requires no segmentation. This is |
| 1740 | * only possible when GSO is used for verifying header integrity. |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1741 | */ |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1742 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1743 | { |
| 1744 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); |
| 1745 | struct packet_type *ptype; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 1746 | __be16 type = skb->protocol; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1747 | int err; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1748 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1749 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1750 | skb->mac_len = skb->network_header - skb->mac_header; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1751 | __skb_pull(skb, skb->mac_len); |
| 1752 | |
Herbert Xu | 67fd1a7 | 2009-01-19 16:26:44 -0800 | [diff] [blame] | 1753 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
| 1754 | struct net_device *dev = skb->dev; |
| 1755 | struct ethtool_drvinfo info = {}; |
| 1756 | |
| 1757 | if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo) |
| 1758 | dev->ethtool_ops->get_drvinfo(dev, &info); |
| 1759 | |
| 1760 | WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d " |
| 1761 | "ip_summed=%d", |
| 1762 | info.driver, dev ? dev->features : 0L, |
| 1763 | skb->sk ? skb->sk->sk_route_caps : 0L, |
| 1764 | skb->len, skb->data_len, skb->ip_summed); |
| 1765 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1766 | if (skb_header_cloned(skb) && |
| 1767 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) |
| 1768 | return ERR_PTR(err); |
| 1769 | } |
| 1770 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1771 | rcu_read_lock(); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 1772 | list_for_each_entry_rcu(ptype, |
| 1773 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1774 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1775 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1776 | err = ptype->gso_send_check(skb); |
| 1777 | segs = ERR_PTR(err); |
| 1778 | if (err || skb_gso_ok(skb, features)) |
| 1779 | break; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1780 | __skb_push(skb, (skb->data - |
| 1781 | skb_network_header(skb))); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1782 | } |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1783 | segs = ptype->gso_segment(skb, features); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1784 | break; |
| 1785 | } |
| 1786 | } |
| 1787 | rcu_read_unlock(); |
| 1788 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1789 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1790 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1791 | return segs; |
| 1792 | } |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1793 | EXPORT_SYMBOL(skb_gso_segment); |
| 1794 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1795 | /* Take action when hardware reception checksum errors are detected. */ |
| 1796 | #ifdef CONFIG_BUG |
| 1797 | void netdev_rx_csum_fault(struct net_device *dev) |
| 1798 | { |
| 1799 | if (net_ratelimit()) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1800 | printk(KERN_ERR "%s: hw csum failure.\n", |
Stephen Hemminger | 246a421 | 2005-12-08 15:21:39 -0800 | [diff] [blame] | 1801 | dev ? dev->name : "<unknown>"); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1802 | dump_stack(); |
| 1803 | } |
| 1804 | } |
| 1805 | EXPORT_SYMBOL(netdev_rx_csum_fault); |
| 1806 | #endif |
| 1807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | /* Actually, we should eliminate this check as soon as we know, that: |
| 1809 | * 1. IOMMU is present and allows to map all the memory. |
| 1810 | * 2. No high memory really exists on this machine. |
| 1811 | */ |
| 1812 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 1813 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | { |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 1815 | #ifdef CONFIG_HIGHMEM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | int i; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 1817 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
| 1818 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) |
| 1819 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) |
| 1820 | return 1; |
| 1821 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 1823 | if (PCI_DMA_BUS_IS_PHYS) { |
| 1824 | struct device *pdev = dev->dev.parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | |
Eric Dumazet | 9092c65 | 2010-04-02 13:34:49 -0700 | [diff] [blame] | 1826 | if (!pdev) |
| 1827 | return 0; |
FUJITA Tomonori | 5acbbd4 | 2010-03-30 22:35:50 +0000 | [diff] [blame] | 1828 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 1829 | dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page); |
| 1830 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
| 1831 | return 1; |
| 1832 | } |
| 1833 | } |
Herbert Xu | 3d3a853 | 2006-06-27 13:33:10 -0700 | [diff] [blame] | 1834 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | return 0; |
| 1836 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1838 | struct dev_gso_cb { |
| 1839 | void (*destructor)(struct sk_buff *skb); |
| 1840 | }; |
| 1841 | |
| 1842 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) |
| 1843 | |
| 1844 | static void dev_gso_skb_destructor(struct sk_buff *skb) |
| 1845 | { |
| 1846 | struct dev_gso_cb *cb; |
| 1847 | |
| 1848 | do { |
| 1849 | struct sk_buff *nskb = skb->next; |
| 1850 | |
| 1851 | skb->next = nskb->next; |
| 1852 | nskb->next = NULL; |
| 1853 | kfree_skb(nskb); |
| 1854 | } while (skb->next); |
| 1855 | |
| 1856 | cb = DEV_GSO_CB(skb); |
| 1857 | if (cb->destructor) |
| 1858 | cb->destructor(skb); |
| 1859 | } |
| 1860 | |
| 1861 | /** |
| 1862 | * dev_gso_segment - Perform emulated hardware segmentation on skb. |
| 1863 | * @skb: buffer to segment |
| 1864 | * |
| 1865 | * This function segments the given skb and stores the list of segments |
| 1866 | * in skb->next. |
| 1867 | */ |
| 1868 | static int dev_gso_segment(struct sk_buff *skb) |
| 1869 | { |
| 1870 | struct net_device *dev = skb->dev; |
| 1871 | struct sk_buff *segs; |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1872 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
| 1873 | NETIF_F_SG : 0); |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1874 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1875 | segs = skb_gso_segment(skb, features); |
| 1876 | |
| 1877 | /* Verifying header integrity only. */ |
| 1878 | if (!segs) |
| 1879 | return 0; |
| 1880 | |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 1881 | if (IS_ERR(segs)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1882 | return PTR_ERR(segs); |
| 1883 | |
| 1884 | skb->next = segs; |
| 1885 | DEV_GSO_CB(skb)->destructor = skb->destructor; |
| 1886 | skb->destructor = dev_gso_skb_destructor; |
| 1887 | |
| 1888 | return 0; |
| 1889 | } |
| 1890 | |
Eric Dumazet | fc6055a | 2010-04-16 12:18:22 +0000 | [diff] [blame] | 1891 | /* |
| 1892 | * Try to orphan skb early, right before transmission by the device. |
| 1893 | * We cannot orphan skb if tx timestamp is requested, since |
| 1894 | * drivers need to call skb_tstamp_tx() to send the timestamp. |
| 1895 | */ |
| 1896 | static inline void skb_orphan_try(struct sk_buff *skb) |
| 1897 | { |
| 1898 | if (!skb_tx(skb)->flags) |
| 1899 | skb_orphan(skb); |
| 1900 | } |
| 1901 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1902 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
| 1903 | struct netdev_queue *txq) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1904 | { |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1905 | const struct net_device_ops *ops = dev->netdev_ops; |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1906 | int rc = NETDEV_TX_OK; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1907 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1908 | if (likely(!skb->next)) { |
Stephen Hemminger | 9be9a6b | 2007-04-20 17:02:45 -0700 | [diff] [blame] | 1909 | if (!list_empty(&ptype_all)) |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1910 | dev_queue_xmit_nit(skb, dev); |
| 1911 | |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 1912 | /* |
| 1913 | * If device doesnt need skb->dst, release it right now while |
| 1914 | * its hot in this cpu cache |
| 1915 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1916 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 1917 | skb_dst_drop(skb); |
| 1918 | |
Eric Dumazet | fc6055a | 2010-04-16 12:18:22 +0000 | [diff] [blame] | 1919 | skb_orphan_try(skb); |
David S. Miller | 9ccb897 | 2010-04-22 01:02:07 -0700 | [diff] [blame] | 1920 | |
| 1921 | if (netif_needs_gso(dev, skb)) { |
| 1922 | if (unlikely(dev_gso_segment(skb))) |
| 1923 | goto out_kfree_skb; |
| 1924 | if (skb->next) |
| 1925 | goto gso; |
| 1926 | } |
| 1927 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1928 | rc = ops->ndo_start_xmit(skb, dev); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 1929 | if (rc == NETDEV_TX_OK) |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 1930 | txq_trans_update(txq); |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1931 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1932 | } |
| 1933 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1934 | gso: |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1935 | do { |
| 1936 | struct sk_buff *nskb = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1937 | |
| 1938 | skb->next = nskb->next; |
| 1939 | nskb->next = NULL; |
Krishna Kumar | 068a2de | 2009-12-09 20:59:58 +0000 | [diff] [blame] | 1940 | |
| 1941 | /* |
| 1942 | * If device doesnt need nskb->dst, release it right now while |
| 1943 | * its hot in this cpu cache |
| 1944 | */ |
| 1945 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
| 1946 | skb_dst_drop(nskb); |
| 1947 | |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1948 | rc = ops->ndo_start_xmit(nskb, dev); |
Patrick McHardy | ec634fe | 2009-07-05 19:23:38 -0700 | [diff] [blame] | 1949 | if (unlikely(rc != NETDEV_TX_OK)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1950 | if (rc & ~NETDEV_TX_MASK) |
| 1951 | goto out_kfree_gso_skb; |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 1952 | nskb->next = skb->next; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1953 | skb->next = nskb; |
| 1954 | return rc; |
| 1955 | } |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 1956 | txq_trans_update(txq); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 1957 | if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) |
Michael Chan | f54d9e8 | 2006-06-25 23:57:04 -0700 | [diff] [blame] | 1958 | return NETDEV_TX_BUSY; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1959 | } while (skb->next); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1960 | |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1961 | out_kfree_gso_skb: |
| 1962 | if (likely(skb->next == NULL)) |
| 1963 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1964 | out_kfree_skb: |
| 1965 | kfree_skb(skb); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 1966 | return rc; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 1967 | } |
| 1968 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 1969 | static u32 hashrnd __read_mostly; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1970 | |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 1971 | u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb) |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1972 | { |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1973 | u32 hash; |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1974 | |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 1975 | if (skb_rx_queue_recorded(skb)) { |
| 1976 | hash = skb_get_rx_queue(skb); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 1977 | while (unlikely(hash >= dev->real_num_tx_queues)) |
David S. Miller | 513de11 | 2009-05-03 14:43:10 -0700 | [diff] [blame] | 1978 | hash -= dev->real_num_tx_queues; |
| 1979 | return hash; |
| 1980 | } |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 1981 | |
| 1982 | if (skb->sk && skb->sk->sk_hash) |
David S. Miller | 7019298 | 2009-01-27 16:34:47 -0800 | [diff] [blame] | 1983 | hash = skb->sk->sk_hash; |
Eric Dumazet | ec581f6 | 2009-05-01 09:05:06 -0700 | [diff] [blame] | 1984 | else |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 1985 | hash = (__force u16) skb->protocol; |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 1986 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 1987 | hash = jhash_1word(hash, hashrnd); |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 1988 | |
David S. Miller | b6b2fed | 2008-07-21 09:48:06 -0700 | [diff] [blame] | 1989 | return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1990 | } |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 1991 | EXPORT_SYMBOL(skb_tx_hash); |
David S. Miller | 8f0f222 | 2008-07-15 03:47:03 -0700 | [diff] [blame] | 1992 | |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 1993 | static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index) |
| 1994 | { |
| 1995 | if (unlikely(queue_index >= dev->real_num_tx_queues)) { |
| 1996 | if (net_ratelimit()) { |
Eric Dumazet | 7a161ea | 2010-04-08 21:26:13 +0000 | [diff] [blame] | 1997 | pr_warning("%s selects TX queue %d, but " |
| 1998 | "real number of TX queues is %d\n", |
| 1999 | dev->name, queue_index, dev->real_num_tx_queues); |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 2000 | } |
| 2001 | return 0; |
| 2002 | } |
| 2003 | return queue_index; |
| 2004 | } |
| 2005 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 2006 | static struct netdev_queue *dev_pick_tx(struct net_device *dev, |
| 2007 | struct sk_buff *skb) |
| 2008 | { |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2009 | u16 queue_index; |
| 2010 | struct sock *sk = skb->sk; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2011 | |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2012 | if (sk_tx_queue_recorded(sk)) { |
| 2013 | queue_index = sk_tx_queue_get(sk); |
| 2014 | } else { |
| 2015 | const struct net_device_ops *ops = dev->netdev_ops; |
| 2016 | |
| 2017 | if (ops->ndo_select_queue) { |
| 2018 | queue_index = ops->ndo_select_queue(dev, skb); |
Eric Dumazet | ed04642 | 2009-11-13 21:54:04 +0000 | [diff] [blame] | 2019 | queue_index = dev_cap_txqueue(dev, queue_index); |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2020 | } else { |
| 2021 | queue_index = 0; |
| 2022 | if (dev->real_num_tx_queues > 1) |
| 2023 | queue_index = skb_tx_hash(dev, skb); |
| 2024 | |
Eric Dumazet | 8728c54 | 2010-04-11 21:18:17 +0000 | [diff] [blame] | 2025 | if (sk) { |
David S. Miller | 87eb367 | 2010-04-21 01:14:25 -0700 | [diff] [blame] | 2026 | struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1); |
Eric Dumazet | 8728c54 | 2010-04-11 21:18:17 +0000 | [diff] [blame] | 2027 | |
| 2028 | if (dst && skb_dst(skb) == dst) |
| 2029 | sk_tx_queue_set(sk, queue_index); |
| 2030 | } |
Krishna Kumar | a4ee3ce | 2009-10-19 23:50:07 +0000 | [diff] [blame] | 2031 | } |
| 2032 | } |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 2033 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2034 | skb_set_queue_mapping(skb, queue_index); |
| 2035 | return netdev_get_tx_queue(dev, queue_index); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 2036 | } |
| 2037 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2038 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
| 2039 | struct net_device *dev, |
| 2040 | struct netdev_queue *txq) |
| 2041 | { |
| 2042 | spinlock_t *root_lock = qdisc_lock(q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2043 | bool contended = qdisc_is_running(q); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2044 | int rc; |
| 2045 | |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2046 | /* |
| 2047 | * Heuristic to force contended enqueues to serialize on a |
| 2048 | * separate lock before trying to get qdisc main lock. |
| 2049 | * This permits __QDISC_STATE_RUNNING owner to get the lock more often |
| 2050 | * and dequeue packets faster. |
| 2051 | */ |
| 2052 | if (unlikely(contended)) |
| 2053 | spin_lock(&q->busylock); |
| 2054 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2055 | spin_lock(root_lock); |
| 2056 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { |
| 2057 | kfree_skb(skb); |
| 2058 | rc = NET_XMIT_DROP; |
| 2059 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 2060 | qdisc_run_begin(q)) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2061 | /* |
| 2062 | * This is a work-conserving queue; there are no old skbs |
| 2063 | * waiting to be sent out; and the qdisc is not running - |
| 2064 | * xmit the skb directly. |
| 2065 | */ |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 2066 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE)) |
| 2067 | skb_dst_force(skb); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2068 | __qdisc_update_bstats(q, skb->len); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2069 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) { |
| 2070 | if (unlikely(contended)) { |
| 2071 | spin_unlock(&q->busylock); |
| 2072 | contended = false; |
| 2073 | } |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2074 | __qdisc_run(q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2075 | } else |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 2076 | qdisc_run_end(q); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2077 | |
| 2078 | rc = NET_XMIT_SUCCESS; |
| 2079 | } else { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 2080 | skb_dst_force(skb); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2081 | rc = qdisc_enqueue_root(skb, q); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2082 | if (qdisc_run_begin(q)) { |
| 2083 | if (unlikely(contended)) { |
| 2084 | spin_unlock(&q->busylock); |
| 2085 | contended = false; |
| 2086 | } |
| 2087 | __qdisc_run(q); |
| 2088 | } |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2089 | } |
| 2090 | spin_unlock(root_lock); |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 2091 | if (unlikely(contended)) |
| 2092 | spin_unlock(&q->busylock); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2093 | return rc; |
| 2094 | } |
| 2095 | |
Krishna Kumar | 4b25846 | 2010-01-21 01:26:29 -0800 | [diff] [blame] | 2096 | /* |
| 2097 | * Returns true if either: |
| 2098 | * 1. skb has frag_list and the device doesn't support FRAGLIST, or |
| 2099 | * 2. skb is fragmented and the device does not support SG, or if |
| 2100 | * at least one of fragments is in highmem and device does not |
| 2101 | * support DMA from it. |
| 2102 | */ |
| 2103 | static inline int skb_needs_linearize(struct sk_buff *skb, |
| 2104 | struct net_device *dev) |
| 2105 | { |
| 2106 | return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) || |
| 2107 | (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) || |
| 2108 | illegal_highdma(dev, skb))); |
| 2109 | } |
| 2110 | |
Dave Jones | d29f749 | 2008-07-22 14:09:06 -0700 | [diff] [blame] | 2111 | /** |
| 2112 | * dev_queue_xmit - transmit a buffer |
| 2113 | * @skb: buffer to transmit |
| 2114 | * |
| 2115 | * Queue a buffer for transmission to a network device. The caller must |
| 2116 | * have set the device and priority and built the buffer before calling |
| 2117 | * this function. The function can be called from an interrupt. |
| 2118 | * |
| 2119 | * A negative errno code is returned on a failure. A success does not |
| 2120 | * guarantee the frame will be transmitted as it may be dropped due |
| 2121 | * to congestion or traffic shaping. |
| 2122 | * |
| 2123 | * ----------------------------------------------------------------------------------- |
| 2124 | * I notice this method can also return errors from the queue disciplines, |
| 2125 | * including NET_XMIT_DROP, which is a positive value. So, errors can also |
| 2126 | * be positive. |
| 2127 | * |
| 2128 | * Regardless of the return value, the skb is consumed, so it is currently |
| 2129 | * difficult to retry a send to this method. (You can bump the ref count |
| 2130 | * before sending to hold a reference for retry if you are careful.) |
| 2131 | * |
| 2132 | * When calling this method, interrupts MUST be enabled. This is because |
| 2133 | * the BH enable code must have IRQs enabled so that it will not deadlock. |
| 2134 | * --BLG |
| 2135 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | int dev_queue_xmit(struct sk_buff *skb) |
| 2137 | { |
| 2138 | struct net_device *dev = skb->dev; |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 2139 | struct netdev_queue *txq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | struct Qdisc *q; |
| 2141 | int rc = -ENOMEM; |
| 2142 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2143 | /* GSO will handle the following emulations directly. */ |
| 2144 | if (netif_needs_gso(dev, skb)) |
| 2145 | goto gso; |
| 2146 | |
Krishna Kumar | 4b25846 | 2010-01-21 01:26:29 -0800 | [diff] [blame] | 2147 | /* Convert a paged skb to linear, if required */ |
| 2148 | if (skb_needs_linearize(skb, dev) && __skb_linearize(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | goto out_kfree_skb; |
| 2150 | |
| 2151 | /* If packet is not checksummed and device does not support |
| 2152 | * checksumming for this protocol, complete checksumming here. |
| 2153 | */ |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 2154 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 2155 | skb_set_transport_header(skb, skb->csum_start - |
| 2156 | skb_headroom(skb)); |
Ben Hutchings | 6de329e | 2008-06-16 17:02:28 -0700 | [diff] [blame] | 2157 | if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb)) |
| 2158 | goto out_kfree_skb; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 2159 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 2161 | gso: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2162 | /* Disable soft irqs for various locks below. Also |
| 2163 | * stops preemption for RCU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2165 | rcu_read_lock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | |
David S. Miller | eae792b | 2008-07-15 03:03:33 -0700 | [diff] [blame] | 2167 | txq = dev_pick_tx(dev, skb); |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 2168 | q = rcu_dereference_bh(txq->qdisc); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | #ifdef CONFIG_NET_CLS_ACT |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2171 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | #endif |
| 2173 | if (q->enqueue) { |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 2174 | rc = __dev_xmit_skb(skb, q, dev, txq); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2175 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | } |
| 2177 | |
| 2178 | /* The device has no queue. Common case for software devices: |
| 2179 | loopback, all the sorts of tunnels... |
| 2180 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 2181 | Really, it is unlikely that netif_tx_lock protection is necessary |
| 2182 | here. (f.e. loopback and IP tunnels are clean ignoring statistics |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | counters.) |
| 2184 | However, it is possible, that they rely on protection |
| 2185 | made by us here. |
| 2186 | |
| 2187 | Check this and shot the lock. It is not prone from deadlocks. |
| 2188 | Either shot noqueue qdisc, it is even simpler 8) |
| 2189 | */ |
| 2190 | if (dev->flags & IFF_UP) { |
| 2191 | int cpu = smp_processor_id(); /* ok because BHs are off */ |
| 2192 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2193 | if (txq->xmit_lock_owner != cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2195 | HARD_TX_LOCK(dev, txq, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 2197 | if (!netif_tx_queue_stopped(txq)) { |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 2198 | rc = dev_hard_start_xmit(skb, dev, txq); |
| 2199 | if (dev_xmit_complete(rc)) { |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2200 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | goto out; |
| 2202 | } |
| 2203 | } |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 2204 | HARD_TX_UNLOCK(dev, txq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | if (net_ratelimit()) |
| 2206 | printk(KERN_CRIT "Virtual device %s asks to " |
| 2207 | "queue packet!\n", dev->name); |
| 2208 | } else { |
| 2209 | /* Recursion is detected! It is possible, |
| 2210 | * unfortunately */ |
| 2211 | if (net_ratelimit()) |
| 2212 | printk(KERN_CRIT "Dead loop on virtual device " |
| 2213 | "%s, fix it urgently!\n", dev->name); |
| 2214 | } |
| 2215 | } |
| 2216 | |
| 2217 | rc = -ENETDOWN; |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2218 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | |
| 2220 | out_kfree_skb: |
| 2221 | kfree_skb(skb); |
| 2222 | return rc; |
| 2223 | out: |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 2224 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | return rc; |
| 2226 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2227 | EXPORT_SYMBOL(dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | |
| 2229 | |
| 2230 | /*======================================================================= |
| 2231 | Receiver routines |
| 2232 | =======================================================================*/ |
| 2233 | |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2234 | int netdev_max_backlog __read_mostly = 1000; |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2235 | int netdev_tstamp_prequeue __read_mostly = 1; |
Stephen Hemminger | 6b2bedc | 2007-03-12 14:33:50 -0700 | [diff] [blame] | 2236 | int netdev_budget __read_mostly = 300; |
| 2237 | int weight_p __read_mostly = 64; /* old backlog weight */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 2239 | /* Called with irq disabled */ |
| 2240 | static inline void ____napi_schedule(struct softnet_data *sd, |
| 2241 | struct napi_struct *napi) |
| 2242 | { |
| 2243 | list_add_tail(&napi->poll_list, &sd->poll_list); |
| 2244 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 2245 | } |
| 2246 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2247 | #ifdef CONFIG_RPS |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2248 | |
| 2249 | /* One global table that all flow-based protocols share. */ |
Eric Dumazet | 8770acf | 2010-04-17 00:54:36 -0700 | [diff] [blame] | 2250 | struct rps_sock_flow_table *rps_sock_flow_table __read_mostly; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2251 | EXPORT_SYMBOL(rps_sock_flow_table); |
| 2252 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2253 | /* |
| 2254 | * get_rps_cpu is called from netif_receive_skb and returns the target |
| 2255 | * 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] | 2256 | * rcu_read_lock must be held on entry. |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2257 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2258 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
| 2259 | struct rps_dev_flow **rflowp) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2260 | { |
| 2261 | struct ipv6hdr *ip6; |
| 2262 | struct iphdr *ip; |
| 2263 | struct netdev_rx_queue *rxqueue; |
| 2264 | struct rps_map *map; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2265 | struct rps_dev_flow_table *flow_table; |
| 2266 | struct rps_sock_flow_table *sock_flow_table; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2267 | int cpu = -1; |
| 2268 | u8 ip_proto; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2269 | u16 tcpu; |
Changli Gao | 8c52d50 | 2010-04-24 22:50:10 -0700 | [diff] [blame] | 2270 | u32 addr1, addr2, ihl; |
| 2271 | union { |
| 2272 | u32 v32; |
| 2273 | u16 v16[2]; |
| 2274 | } ports; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2275 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2276 | if (skb_rx_queue_recorded(skb)) { |
| 2277 | u16 index = skb_get_rx_queue(skb); |
| 2278 | if (unlikely(index >= dev->num_rx_queues)) { |
| 2279 | if (net_ratelimit()) { |
Eric Dumazet | 7a161ea | 2010-04-08 21:26:13 +0000 | [diff] [blame] | 2280 | pr_warning("%s received packet on queue " |
| 2281 | "%u, but number of RX queues is %u\n", |
| 2282 | dev->name, index, dev->num_rx_queues); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2283 | } |
| 2284 | goto done; |
| 2285 | } |
| 2286 | rxqueue = dev->_rx + index; |
| 2287 | } else |
| 2288 | rxqueue = dev->_rx; |
| 2289 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2290 | if (!rxqueue->rps_map && !rxqueue->rps_flow_table) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2291 | goto done; |
| 2292 | |
| 2293 | if (skb->rxhash) |
| 2294 | goto got_hash; /* Skip hash computation on packet header */ |
| 2295 | |
| 2296 | switch (skb->protocol) { |
| 2297 | case __constant_htons(ETH_P_IP): |
| 2298 | if (!pskb_may_pull(skb, sizeof(*ip))) |
| 2299 | goto done; |
| 2300 | |
| 2301 | ip = (struct iphdr *) skb->data; |
| 2302 | ip_proto = ip->protocol; |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 2303 | addr1 = (__force u32) ip->saddr; |
| 2304 | addr2 = (__force u32) ip->daddr; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2305 | ihl = ip->ihl; |
| 2306 | break; |
| 2307 | case __constant_htons(ETH_P_IPV6): |
| 2308 | if (!pskb_may_pull(skb, sizeof(*ip6))) |
| 2309 | goto done; |
| 2310 | |
| 2311 | ip6 = (struct ipv6hdr *) skb->data; |
| 2312 | ip_proto = ip6->nexthdr; |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 2313 | addr1 = (__force u32) ip6->saddr.s6_addr32[3]; |
| 2314 | addr2 = (__force u32) ip6->daddr.s6_addr32[3]; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2315 | ihl = (40 >> 2); |
| 2316 | break; |
| 2317 | default: |
| 2318 | goto done; |
| 2319 | } |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2320 | switch (ip_proto) { |
| 2321 | case IPPROTO_TCP: |
| 2322 | case IPPROTO_UDP: |
| 2323 | case IPPROTO_DCCP: |
| 2324 | case IPPROTO_ESP: |
| 2325 | case IPPROTO_AH: |
| 2326 | case IPPROTO_SCTP: |
| 2327 | case IPPROTO_UDPLITE: |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 2328 | if (pskb_may_pull(skb, (ihl * 4) + 4)) { |
Changli Gao | 8c52d50 | 2010-04-24 22:50:10 -0700 | [diff] [blame] | 2329 | ports.v32 = * (__force u32 *) (skb->data + (ihl * 4)); |
| 2330 | if (ports.v16[1] < ports.v16[0]) |
| 2331 | swap(ports.v16[0], ports.v16[1]); |
| 2332 | break; |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 2333 | } |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2334 | default: |
Changli Gao | 8c52d50 | 2010-04-24 22:50:10 -0700 | [diff] [blame] | 2335 | ports.v32 = 0; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2336 | break; |
| 2337 | } |
| 2338 | |
Eric Dumazet | b249dcb | 2010-04-19 21:56:38 +0000 | [diff] [blame] | 2339 | /* get a consistent hash (same value on both flow directions) */ |
| 2340 | if (addr2 < addr1) |
| 2341 | swap(addr1, addr2); |
Changli Gao | 8c52d50 | 2010-04-24 22:50:10 -0700 | [diff] [blame] | 2342 | skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2343 | if (!skb->rxhash) |
| 2344 | skb->rxhash = 1; |
| 2345 | |
| 2346 | got_hash: |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2347 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
| 2348 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
| 2349 | if (flow_table && sock_flow_table) { |
| 2350 | u16 next_cpu; |
| 2351 | struct rps_dev_flow *rflow; |
| 2352 | |
| 2353 | rflow = &flow_table->flows[skb->rxhash & flow_table->mask]; |
| 2354 | tcpu = rflow->cpu; |
| 2355 | |
| 2356 | next_cpu = sock_flow_table->ents[skb->rxhash & |
| 2357 | sock_flow_table->mask]; |
| 2358 | |
| 2359 | /* |
| 2360 | * If the desired CPU (where last recvmsg was done) is |
| 2361 | * different from current CPU (one in the rx-queue flow |
| 2362 | * table entry), switch if one of the following holds: |
| 2363 | * - Current CPU is unset (equal to RPS_NO_CPU). |
| 2364 | * - Current CPU is offline. |
| 2365 | * - The current CPU's queue tail has advanced beyond the |
| 2366 | * last packet that was enqueued using this table entry. |
| 2367 | * This guarantees that all previous packets for the flow |
| 2368 | * have been dequeued, thus preserving in order delivery. |
| 2369 | */ |
| 2370 | if (unlikely(tcpu != next_cpu) && |
| 2371 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || |
| 2372 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
| 2373 | rflow->last_qtail)) >= 0)) { |
| 2374 | tcpu = rflow->cpu = next_cpu; |
| 2375 | if (tcpu != RPS_NO_CPU) |
| 2376 | rflow->last_qtail = per_cpu(softnet_data, |
| 2377 | tcpu).input_queue_head; |
| 2378 | } |
| 2379 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
| 2380 | *rflowp = rflow; |
| 2381 | cpu = tcpu; |
| 2382 | goto done; |
| 2383 | } |
| 2384 | } |
| 2385 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2386 | map = rcu_dereference(rxqueue->rps_map); |
| 2387 | if (map) { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2388 | tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32]; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2389 | |
| 2390 | if (cpu_online(tcpu)) { |
| 2391 | cpu = tcpu; |
| 2392 | goto done; |
| 2393 | } |
| 2394 | } |
| 2395 | |
| 2396 | done: |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2397 | return cpu; |
| 2398 | } |
| 2399 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2400 | /* Called from hardirq (IPI) context */ |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2401 | static void rps_trigger_softirq(void *data) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2402 | { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2403 | struct softnet_data *sd = data; |
| 2404 | |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 2405 | ____napi_schedule(sd, &sd->backlog); |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 2406 | sd->received_rps++; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2407 | } |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2408 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2409 | #endif /* CONFIG_RPS */ |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2410 | |
| 2411 | /* |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2412 | * Check if this softnet_data structure is another cpu one |
| 2413 | * If yes, queue it to our IPI list and return 1 |
| 2414 | * If no, return 0 |
| 2415 | */ |
| 2416 | static int rps_ipi_queued(struct softnet_data *sd) |
| 2417 | { |
| 2418 | #ifdef CONFIG_RPS |
| 2419 | struct softnet_data *mysd = &__get_cpu_var(softnet_data); |
| 2420 | |
| 2421 | if (sd != mysd) { |
| 2422 | sd->rps_ipi_next = mysd->rps_ipi_list; |
| 2423 | mysd->rps_ipi_list = sd; |
| 2424 | |
| 2425 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 2426 | return 1; |
| 2427 | } |
| 2428 | #endif /* CONFIG_RPS */ |
| 2429 | return 0; |
| 2430 | } |
| 2431 | |
| 2432 | /* |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2433 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog |
| 2434 | * queue (may be a remote CPU queue). |
| 2435 | */ |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2436 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
| 2437 | unsigned int *qtail) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2438 | { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2439 | struct softnet_data *sd; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2440 | unsigned long flags; |
| 2441 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2442 | sd = &per_cpu(softnet_data, cpu); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2443 | |
| 2444 | local_irq_save(flags); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2445 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2446 | rps_lock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 2447 | if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) { |
| 2448 | if (skb_queue_len(&sd->input_pkt_queue)) { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2449 | enqueue: |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2450 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 2451 | input_queue_tail_incr_save(sd, qtail); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2452 | rps_unlock(sd); |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2453 | local_irq_restore(flags); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2454 | return NET_RX_SUCCESS; |
| 2455 | } |
| 2456 | |
Eric Dumazet | ebda37c2 | 2010-05-06 23:51:21 +0000 | [diff] [blame] | 2457 | /* Schedule NAPI for backlog device |
| 2458 | * We can use non atomic operation since we own the queue lock |
| 2459 | */ |
| 2460 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2461 | if (!rps_ipi_queued(sd)) |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 2462 | ____napi_schedule(sd, &sd->backlog); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2463 | } |
| 2464 | goto enqueue; |
| 2465 | } |
| 2466 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 2467 | sd->dropped++; |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2468 | rps_unlock(sd); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2469 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2470 | local_irq_restore(flags); |
| 2471 | |
| 2472 | kfree_skb(skb); |
| 2473 | return NET_RX_DROP; |
| 2474 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | /** |
| 2477 | * netif_rx - post buffer to the network code |
| 2478 | * @skb: buffer to post |
| 2479 | * |
| 2480 | * This function receives a packet from a device driver and queues it for |
| 2481 | * the upper (protocol) levels to process. It always succeeds. The buffer |
| 2482 | * may be dropped during processing for congestion control or by the |
| 2483 | * protocol layers. |
| 2484 | * |
| 2485 | * return values: |
| 2486 | * NET_RX_SUCCESS (no congestion) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | * NET_RX_DROP (packet was dropped) |
| 2488 | * |
| 2489 | */ |
| 2490 | |
| 2491 | int netif_rx(struct sk_buff *skb) |
| 2492 | { |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2493 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2494 | |
| 2495 | /* if netpoll wants it, pretend we never saw it */ |
| 2496 | if (netpoll_rx(skb)) |
| 2497 | return NET_RX_DROP; |
| 2498 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2499 | if (netdev_tstamp_prequeue) |
| 2500 | net_timestamp_check(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2502 | #ifdef CONFIG_RPS |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2503 | { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2504 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2505 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2506 | |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2507 | rcu_read_lock(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2508 | |
| 2509 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2510 | if (cpu < 0) |
| 2511 | cpu = smp_processor_id(); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2512 | |
| 2513 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 2514 | |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2515 | rcu_read_unlock(); |
| 2516 | } |
| 2517 | #else |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2518 | { |
| 2519 | unsigned int qtail; |
| 2520 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
| 2521 | put_cpu(); |
| 2522 | } |
Eric Dumazet | b0e28f1 | 2010-04-15 00:14:07 -0700 | [diff] [blame] | 2523 | #endif |
| 2524 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2525 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2526 | EXPORT_SYMBOL(netif_rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | |
| 2528 | int netif_rx_ni(struct sk_buff *skb) |
| 2529 | { |
| 2530 | int err; |
| 2531 | |
| 2532 | preempt_disable(); |
| 2533 | err = netif_rx(skb); |
| 2534 | if (local_softirq_pending()) |
| 2535 | do_softirq(); |
| 2536 | preempt_enable(); |
| 2537 | |
| 2538 | return err; |
| 2539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | EXPORT_SYMBOL(netif_rx_ni); |
| 2541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | static void net_tx_action(struct softirq_action *h) |
| 2543 | { |
| 2544 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
| 2545 | |
| 2546 | if (sd->completion_queue) { |
| 2547 | struct sk_buff *clist; |
| 2548 | |
| 2549 | local_irq_disable(); |
| 2550 | clist = sd->completion_queue; |
| 2551 | sd->completion_queue = NULL; |
| 2552 | local_irq_enable(); |
| 2553 | |
| 2554 | while (clist) { |
| 2555 | struct sk_buff *skb = clist; |
| 2556 | clist = clist->next; |
| 2557 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 2558 | WARN_ON(atomic_read(&skb->users)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | __kfree_skb(skb); |
| 2560 | } |
| 2561 | } |
| 2562 | |
| 2563 | if (sd->output_queue) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2564 | struct Qdisc *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | |
| 2566 | local_irq_disable(); |
| 2567 | head = sd->output_queue; |
| 2568 | sd->output_queue = NULL; |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 2569 | sd->output_queue_tailp = &sd->output_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2570 | local_irq_enable(); |
| 2571 | |
| 2572 | while (head) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2573 | struct Qdisc *q = head; |
| 2574 | spinlock_t *root_lock; |
| 2575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | head = head->next_sched; |
| 2577 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 2578 | root_lock = qdisc_lock(q); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2579 | if (spin_trylock(root_lock)) { |
Jarek Poplawski | def82a1 | 2008-08-17 21:54:43 -0700 | [diff] [blame] | 2580 | smp_mb__before_clear_bit(); |
| 2581 | clear_bit(__QDISC_STATE_SCHED, |
| 2582 | &q->state); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 2583 | qdisc_run(q); |
| 2584 | spin_unlock(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2585 | } else { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 2586 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 2587 | &q->state)) { |
David S. Miller | 195648b | 2008-08-19 04:00:36 -0700 | [diff] [blame] | 2588 | __netif_reschedule(q); |
Jarek Poplawski | e8a83e1 | 2008-09-07 18:41:21 -0700 | [diff] [blame] | 2589 | } else { |
| 2590 | smp_mb__before_clear_bit(); |
| 2591 | clear_bit(__QDISC_STATE_SCHED, |
| 2592 | &q->state); |
| 2593 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2594 | } |
| 2595 | } |
| 2596 | } |
| 2597 | } |
| 2598 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 2599 | static inline int deliver_skb(struct sk_buff *skb, |
| 2600 | struct packet_type *pt_prev, |
| 2601 | struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2602 | { |
| 2603 | atomic_inc(&skb->users); |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2604 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2605 | } |
| 2606 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 2607 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
| 2608 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2609 | /* This hook is defined here for ATM LANE */ |
| 2610 | int (*br_fdb_test_addr_hook)(struct net_device *dev, |
| 2611 | unsigned char *addr) __read_mostly; |
Stephen Hemminger | 4fb019a | 2009-09-11 11:50:08 -0700 | [diff] [blame] | 2612 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
Michał Mirosław | da67829 | 2009-06-05 05:35:28 +0000 | [diff] [blame] | 2613 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | #ifdef CONFIG_NET_CLS_ACT |
| 2616 | /* TODO: Maybe we should just force sch_ingress to be compiled in |
| 2617 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions |
| 2618 | * a compare and 2 stores extra right now if we dont have it on |
| 2619 | * but have CONFIG_NET_CLS_ACT |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2620 | * NOTE: This doesnt stop any functionality; if you dont have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | * the ingress scheduler, you just cant add policies on ingress. |
| 2622 | * |
| 2623 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2624 | static int ing_filter(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2625 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2626 | struct net_device *dev = skb->dev; |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2627 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 2628 | struct netdev_queue *rxq; |
| 2629 | int result = TC_ACT_OK; |
| 2630 | struct Qdisc *q; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2631 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2632 | if (MAX_RED_LOOP < ttl++) { |
| 2633 | printk(KERN_WARNING |
| 2634 | "Redir loop detected Dropping packet (%d->%d)\n", |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 2635 | skb->skb_iif, dev->ifindex); |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2636 | return TC_ACT_SHOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2637 | } |
| 2638 | |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2639 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
| 2640 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); |
| 2641 | |
David S. Miller | 555353c | 2008-07-08 17:33:13 -0700 | [diff] [blame] | 2642 | rxq = &dev->rx_queue; |
| 2643 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2644 | q = rxq->qdisc; |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 2645 | if (q != &noop_qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2646 | spin_lock(qdisc_lock(q)); |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 2647 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
| 2648 | result = qdisc_enqueue_root(skb, q); |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 2649 | spin_unlock(qdisc_lock(q)); |
| 2650 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2652 | return result; |
| 2653 | } |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2654 | |
| 2655 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
| 2656 | struct packet_type **pt_prev, |
| 2657 | int *ret, struct net_device *orig_dev) |
| 2658 | { |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 2659 | if (skb->dev->rx_queue.qdisc == &noop_qdisc) |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2660 | goto out; |
| 2661 | |
| 2662 | if (*pt_prev) { |
| 2663 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
| 2664 | *pt_prev = NULL; |
| 2665 | } else { |
| 2666 | /* Huh? Why does turning on AF_PACKET affect this? */ |
| 2667 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); |
| 2668 | } |
| 2669 | |
| 2670 | switch (ing_filter(skb)) { |
| 2671 | case TC_ACT_SHOT: |
| 2672 | case TC_ACT_STOLEN: |
| 2673 | kfree_skb(skb); |
| 2674 | return NULL; |
| 2675 | } |
| 2676 | |
| 2677 | out: |
| 2678 | skb->tc_verd = 0; |
| 2679 | return skb; |
| 2680 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2681 | #endif |
| 2682 | |
Patrick McHardy | bc1d041 | 2008-07-14 22:49:30 -0700 | [diff] [blame] | 2683 | /* |
| 2684 | * netif_nit_deliver - deliver received packets to network taps |
| 2685 | * @skb: buffer |
| 2686 | * |
| 2687 | * This function is used to deliver incoming packets to network |
| 2688 | * taps. It should be used when the normal netif_receive_skb path |
| 2689 | * is bypassed, for example because of VLAN acceleration. |
| 2690 | */ |
| 2691 | void netif_nit_deliver(struct sk_buff *skb) |
| 2692 | { |
| 2693 | struct packet_type *ptype; |
| 2694 | |
| 2695 | if (list_empty(&ptype_all)) |
| 2696 | return; |
| 2697 | |
| 2698 | skb_reset_network_header(skb); |
| 2699 | skb_reset_transport_header(skb); |
| 2700 | skb->mac_len = skb->network_header - skb->mac_header; |
| 2701 | |
| 2702 | rcu_read_lock(); |
| 2703 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
| 2704 | if (!ptype->dev || ptype->dev == skb->dev) |
| 2705 | deliver_skb(skb, ptype, skb->dev); |
| 2706 | } |
| 2707 | rcu_read_unlock(); |
| 2708 | } |
| 2709 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 2710 | /** |
| 2711 | * netdev_rx_handler_register - register receive handler |
| 2712 | * @dev: device to register a handler for |
| 2713 | * @rx_handler: receive handler to register |
| 2714 | * |
| 2715 | * Register a receive hander for a device. This handler will then be |
| 2716 | * called from __netif_receive_skb. A negative errno code is returned |
| 2717 | * on a failure. |
| 2718 | * |
| 2719 | * The caller must hold the rtnl_mutex. |
| 2720 | */ |
| 2721 | int netdev_rx_handler_register(struct net_device *dev, |
| 2722 | rx_handler_func_t *rx_handler) |
| 2723 | { |
| 2724 | ASSERT_RTNL(); |
| 2725 | |
| 2726 | if (dev->rx_handler) |
| 2727 | return -EBUSY; |
| 2728 | |
| 2729 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
| 2730 | |
| 2731 | return 0; |
| 2732 | } |
| 2733 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); |
| 2734 | |
| 2735 | /** |
| 2736 | * netdev_rx_handler_unregister - unregister receive handler |
| 2737 | * @dev: device to unregister a handler from |
| 2738 | * |
| 2739 | * Unregister a receive hander from a device. |
| 2740 | * |
| 2741 | * The caller must hold the rtnl_mutex. |
| 2742 | */ |
| 2743 | void netdev_rx_handler_unregister(struct net_device *dev) |
| 2744 | { |
| 2745 | |
| 2746 | ASSERT_RTNL(); |
| 2747 | rcu_assign_pointer(dev->rx_handler, NULL); |
| 2748 | } |
| 2749 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); |
| 2750 | |
Eric Dumazet | acbbc07 | 2010-04-11 06:56:11 +0000 | [diff] [blame] | 2751 | static inline void skb_bond_set_mac_by_master(struct sk_buff *skb, |
| 2752 | struct net_device *master) |
| 2753 | { |
| 2754 | if (skb->pkt_type == PACKET_HOST) { |
| 2755 | u16 *dest = (u16 *) eth_hdr(skb)->h_dest; |
| 2756 | |
| 2757 | memcpy(dest, master->dev_addr, ETH_ALEN); |
| 2758 | } |
| 2759 | } |
| 2760 | |
| 2761 | /* On bonding slaves other than the currently active slave, suppress |
| 2762 | * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and |
| 2763 | * ARP on active-backup slaves with arp_validate enabled. |
| 2764 | */ |
| 2765 | int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master) |
| 2766 | { |
| 2767 | struct net_device *dev = skb->dev; |
| 2768 | |
| 2769 | if (master->priv_flags & IFF_MASTER_ARPMON) |
| 2770 | dev->last_rx = jiffies; |
| 2771 | |
| 2772 | if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) { |
| 2773 | /* Do address unmangle. The local destination address |
| 2774 | * will be always the one master has. Provides the right |
| 2775 | * functionality in a bridge. |
| 2776 | */ |
| 2777 | skb_bond_set_mac_by_master(skb, master); |
| 2778 | } |
| 2779 | |
| 2780 | if (dev->priv_flags & IFF_SLAVE_INACTIVE) { |
| 2781 | if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && |
| 2782 | skb->protocol == __cpu_to_be16(ETH_P_ARP)) |
| 2783 | return 0; |
| 2784 | |
| 2785 | if (master->priv_flags & IFF_MASTER_ALB) { |
| 2786 | if (skb->pkt_type != PACKET_BROADCAST && |
| 2787 | skb->pkt_type != PACKET_MULTICAST) |
| 2788 | return 0; |
| 2789 | } |
| 2790 | if (master->priv_flags & IFF_MASTER_8023AD && |
| 2791 | skb->protocol == __cpu_to_be16(ETH_P_SLOW)) |
| 2792 | return 0; |
| 2793 | |
| 2794 | return 1; |
| 2795 | } |
| 2796 | return 0; |
| 2797 | } |
| 2798 | EXPORT_SYMBOL(__skb_bond_should_drop); |
| 2799 | |
Eric Dumazet | 10f744d | 2010-03-28 23:07:20 -0700 | [diff] [blame] | 2800 | static int __netif_receive_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | { |
| 2802 | struct packet_type *ptype, *pt_prev; |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 2803 | rx_handler_func_t *rx_handler; |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2804 | struct net_device *orig_dev; |
Eric Dumazet | 0641e4f | 2010-03-18 21:16:45 -0700 | [diff] [blame] | 2805 | struct net_device *master; |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2806 | struct net_device *null_or_orig; |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2807 | struct net_device *null_or_bond; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2808 | int ret = NET_RX_DROP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 2809 | __be16 type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2810 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2811 | if (!netdev_tstamp_prequeue) |
| 2812 | net_timestamp_check(skb); |
Eric Dumazet | 81bbb3d | 2009-09-30 16:42:42 -0700 | [diff] [blame] | 2813 | |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 2814 | if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb)) |
Patrick McHardy | 9b22ea5 | 2008-11-04 14:49:57 -0800 | [diff] [blame] | 2815 | return NET_RX_SUCCESS; |
| 2816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | /* if we've gotten here through NAPI, check netpoll */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2818 | if (netpoll_receive_skb(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2819 | return NET_RX_DROP; |
| 2820 | |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 2821 | if (!skb->skb_iif) |
| 2822 | skb->skb_iif = skb->dev->ifindex; |
David S. Miller | 86e65da | 2005-08-09 19:36:29 -0700 | [diff] [blame] | 2823 | |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2824 | null_or_orig = NULL; |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 2825 | orig_dev = skb->dev; |
Eric Dumazet | 0641e4f | 2010-03-18 21:16:45 -0700 | [diff] [blame] | 2826 | master = ACCESS_ONCE(orig_dev->master); |
| 2827 | if (master) { |
| 2828 | if (skb_bond_should_drop(skb, master)) |
Joe Eykholt | 0d7a368 | 2008-07-02 18:22:01 -0700 | [diff] [blame] | 2829 | null_or_orig = orig_dev; /* deliver only exact match */ |
| 2830 | else |
Eric Dumazet | 0641e4f | 2010-03-18 21:16:45 -0700 | [diff] [blame] | 2831 | skb->dev = master; |
Joe Eykholt | cc9bd5c | 2008-07-02 18:22:00 -0700 | [diff] [blame] | 2832 | } |
Jay Vosburgh | 8f903c7 | 2006-02-21 16:36:44 -0800 | [diff] [blame] | 2833 | |
Eric Dumazet | 27f39c73e | 2010-05-19 22:07:23 +0000 | [diff] [blame] | 2834 | __this_cpu_inc(softnet_data.processed); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2835 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 2836 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 2837 | skb->mac_len = skb->network_header - skb->mac_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2838 | |
| 2839 | pt_prev = NULL; |
| 2840 | |
| 2841 | rcu_read_lock(); |
| 2842 | |
| 2843 | #ifdef CONFIG_NET_CLS_ACT |
| 2844 | if (skb->tc_verd & TC_NCLS) { |
| 2845 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); |
| 2846 | goto ncls; |
| 2847 | } |
| 2848 | #endif |
| 2849 | |
| 2850 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
Joe Eykholt | f982307 | 2008-07-02 18:22:02 -0700 | [diff] [blame] | 2851 | if (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
| 2852 | ptype->dev == orig_dev) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2853 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2854 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2855 | pt_prev = ptype; |
| 2856 | } |
| 2857 | } |
| 2858 | |
| 2859 | #ifdef CONFIG_NET_CLS_ACT |
Herbert Xu | f697c3e | 2007-10-14 00:38:47 -0700 | [diff] [blame] | 2860 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
| 2861 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2862 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2863 | ncls: |
| 2864 | #endif |
| 2865 | |
Jiri Pirko | ab95bfe | 2010-06-01 21:52:08 +0000 | [diff] [blame] | 2866 | /* Handle special case of bridge or macvlan */ |
| 2867 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
| 2868 | if (rx_handler) { |
| 2869 | if (pt_prev) { |
| 2870 | ret = deliver_skb(skb, pt_prev, orig_dev); |
| 2871 | pt_prev = NULL; |
| 2872 | } |
| 2873 | skb = rx_handler(skb); |
| 2874 | if (!skb) |
| 2875 | goto out; |
| 2876 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2877 | |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2878 | /* |
| 2879 | * Make sure frames received on VLAN interfaces stacked on |
| 2880 | * bonding interfaces still make their way to any base bonding |
| 2881 | * device that may have registered for a specific ptype. The |
| 2882 | * handler may have to adjust skb->dev and orig_dev. |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2883 | */ |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2884 | null_or_bond = NULL; |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2885 | if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) && |
| 2886 | (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) { |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2887 | null_or_bond = vlan_dev_real_dev(skb->dev); |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2888 | } |
| 2889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2890 | type = skb->protocol; |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 2891 | list_for_each_entry_rcu(ptype, |
| 2892 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { |
Andy Gospodarek | 1f3c880 | 2009-12-14 10:48:58 +0000 | [diff] [blame] | 2893 | if (ptype->type == type && (ptype->dev == null_or_orig || |
Andy Gospodarek | ca8d9ea | 2010-01-06 12:56:37 +0000 | [diff] [blame] | 2894 | ptype->dev == skb->dev || ptype->dev == orig_dev || |
| 2895 | ptype->dev == null_or_bond)) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2896 | if (pt_prev) |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2897 | ret = deliver_skb(skb, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2898 | pt_prev = ptype; |
| 2899 | } |
| 2900 | } |
| 2901 | |
| 2902 | if (pt_prev) { |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 2903 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | } else { |
| 2905 | kfree_skb(skb); |
| 2906 | /* Jamal, now you will not able to escape explaining |
| 2907 | * me how you were going to use this. :-) |
| 2908 | */ |
| 2909 | ret = NET_RX_DROP; |
| 2910 | } |
| 2911 | |
| 2912 | out: |
| 2913 | rcu_read_unlock(); |
| 2914 | return ret; |
| 2915 | } |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2916 | |
| 2917 | /** |
| 2918 | * netif_receive_skb - process receive buffer from network |
| 2919 | * @skb: buffer to process |
| 2920 | * |
| 2921 | * netif_receive_skb() is the main receive data processing function. |
| 2922 | * It always succeeds. The buffer may be dropped during processing |
| 2923 | * for congestion control or by the protocol layers. |
| 2924 | * |
| 2925 | * This function may only be called from softirq context and interrupts |
| 2926 | * should be enabled. |
| 2927 | * |
| 2928 | * Return values (usually ignored): |
| 2929 | * NET_RX_SUCCESS: no congestion |
| 2930 | * NET_RX_DROP: packet was dropped |
| 2931 | */ |
| 2932 | int netif_receive_skb(struct sk_buff *skb) |
| 2933 | { |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2934 | if (netdev_tstamp_prequeue) |
| 2935 | net_timestamp_check(skb); |
| 2936 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 2937 | #ifdef CONFIG_RPS |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2938 | { |
| 2939 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
| 2940 | int cpu, ret; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2941 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2942 | rcu_read_lock(); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2943 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2944 | cpu = get_rps_cpu(skb->dev, skb, &rflow); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2945 | |
Eric Dumazet | 3b098e2 | 2010-05-15 23:57:10 -0700 | [diff] [blame] | 2946 | if (cpu >= 0) { |
| 2947 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
| 2948 | rcu_read_unlock(); |
| 2949 | } else { |
| 2950 | rcu_read_unlock(); |
| 2951 | ret = __netif_receive_skb(skb); |
| 2952 | } |
| 2953 | |
| 2954 | return ret; |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 2955 | } |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 2956 | #else |
| 2957 | return __netif_receive_skb(skb); |
| 2958 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 2959 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 2960 | EXPORT_SYMBOL(netif_receive_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2961 | |
Eric Dumazet | 8875127 | 2010-04-19 05:07:33 +0000 | [diff] [blame] | 2962 | /* Network device is going away, flush any packets still pending |
| 2963 | * Called with irqs disabled. |
| 2964 | */ |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2965 | static void flush_backlog(void *arg) |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2966 | { |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 2967 | struct net_device *dev = arg; |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2968 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2969 | struct sk_buff *skb, *tmp; |
| 2970 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2971 | rps_lock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 2972 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2973 | if (skb->dev == dev) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2974 | __skb_unlink(skb, &sd->input_pkt_queue); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2975 | kfree_skb(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 2976 | input_queue_head_incr(sd); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2977 | } |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 2978 | } |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 2979 | rps_unlock(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 2980 | |
| 2981 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { |
| 2982 | if (skb->dev == dev) { |
| 2983 | __skb_unlink(skb, &sd->process_queue); |
| 2984 | kfree_skb(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 2985 | input_queue_head_incr(sd); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 2986 | } |
| 2987 | } |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 2988 | } |
| 2989 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2990 | static int napi_gro_complete(struct sk_buff *skb) |
| 2991 | { |
| 2992 | struct packet_type *ptype; |
| 2993 | __be16 type = skb->protocol; |
| 2994 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
| 2995 | int err = -ENOENT; |
| 2996 | |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 2997 | if (NAPI_GRO_CB(skb)->count == 1) { |
| 2998 | skb_shinfo(skb)->gso_size = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 2999 | goto out; |
Herbert Xu | fc59f9a | 2009-04-14 15:11:06 -0700 | [diff] [blame] | 3000 | } |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3001 | |
| 3002 | rcu_read_lock(); |
| 3003 | list_for_each_entry_rcu(ptype, head, list) { |
| 3004 | if (ptype->type != type || ptype->dev || !ptype->gro_complete) |
| 3005 | continue; |
| 3006 | |
| 3007 | err = ptype->gro_complete(skb); |
| 3008 | break; |
| 3009 | } |
| 3010 | rcu_read_unlock(); |
| 3011 | |
| 3012 | if (err) { |
| 3013 | WARN_ON(&ptype->list == head); |
| 3014 | kfree_skb(skb); |
| 3015 | return NET_RX_SUCCESS; |
| 3016 | } |
| 3017 | |
| 3018 | out: |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3019 | return netif_receive_skb(skb); |
| 3020 | } |
| 3021 | |
David S. Miller | 11380a4 | 2010-01-19 13:46:10 -0800 | [diff] [blame] | 3022 | static void napi_gro_flush(struct napi_struct *napi) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3023 | { |
| 3024 | struct sk_buff *skb, *next; |
| 3025 | |
| 3026 | for (skb = napi->gro_list; skb; skb = next) { |
| 3027 | next = skb->next; |
| 3028 | skb->next = NULL; |
| 3029 | napi_gro_complete(skb); |
| 3030 | } |
| 3031 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3032 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3033 | napi->gro_list = NULL; |
| 3034 | } |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3035 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3036 | 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] | 3037 | { |
| 3038 | struct sk_buff **pp = NULL; |
| 3039 | struct packet_type *ptype; |
| 3040 | __be16 type = skb->protocol; |
| 3041 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3042 | int same_flow; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3043 | int mac_len; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3044 | enum gro_result ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3045 | |
| 3046 | if (!(skb->dev->features & NETIF_F_GRO)) |
| 3047 | goto normal; |
| 3048 | |
David S. Miller | 4cf704f | 2009-06-09 00:18:51 -0700 | [diff] [blame] | 3049 | if (skb_is_gso(skb) || skb_has_frags(skb)) |
Herbert Xu | f17f5c9 | 2009-01-14 14:36:12 -0800 | [diff] [blame] | 3050 | goto normal; |
| 3051 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3052 | rcu_read_lock(); |
| 3053 | list_for_each_entry_rcu(ptype, head, list) { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3054 | if (ptype->type != type || ptype->dev || !ptype->gro_receive) |
| 3055 | continue; |
| 3056 | |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3057 | skb_set_network_header(skb, skb_gro_offset(skb)); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3058 | mac_len = skb->network_header - skb->mac_header; |
| 3059 | skb->mac_len = mac_len; |
| 3060 | NAPI_GRO_CB(skb)->same_flow = 0; |
| 3061 | NAPI_GRO_CB(skb)->flush = 0; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3062 | NAPI_GRO_CB(skb)->free = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3063 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3064 | pp = ptype->gro_receive(&napi->gro_list, skb); |
| 3065 | break; |
| 3066 | } |
| 3067 | rcu_read_unlock(); |
| 3068 | |
| 3069 | if (&ptype->list == head) |
| 3070 | goto normal; |
| 3071 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3072 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3073 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3074 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3075 | if (pp) { |
| 3076 | struct sk_buff *nskb = *pp; |
| 3077 | |
| 3078 | *pp = nskb->next; |
| 3079 | nskb->next = NULL; |
| 3080 | napi_gro_complete(nskb); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3081 | napi->gro_count--; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3082 | } |
| 3083 | |
Herbert Xu | 0da2afd5 | 2008-12-26 14:57:42 -0800 | [diff] [blame] | 3084 | if (same_flow) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3085 | goto ok; |
| 3086 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3087 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3088 | goto normal; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3089 | |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3090 | napi->gro_count++; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3091 | NAPI_GRO_CB(skb)->count = 1; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3092 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3093 | skb->next = napi->gro_list; |
| 3094 | napi->gro_list = skb; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3095 | ret = GRO_HELD; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3096 | |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3097 | pull: |
Herbert Xu | cb18978 | 2009-05-26 18:50:31 +0000 | [diff] [blame] | 3098 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
| 3099 | int grow = skb_gro_offset(skb) - skb_headlen(skb); |
| 3100 | |
| 3101 | BUG_ON(skb->end - skb->tail < grow); |
| 3102 | |
| 3103 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); |
| 3104 | |
| 3105 | skb->tail += grow; |
| 3106 | skb->data_len -= grow; |
| 3107 | |
| 3108 | skb_shinfo(skb)->frags[0].page_offset += grow; |
| 3109 | skb_shinfo(skb)->frags[0].size -= grow; |
| 3110 | |
| 3111 | if (unlikely(!skb_shinfo(skb)->frags[0].size)) { |
| 3112 | put_page(skb_shinfo(skb)->frags[0].page); |
| 3113 | memmove(skb_shinfo(skb)->frags, |
| 3114 | skb_shinfo(skb)->frags + 1, |
| 3115 | --skb_shinfo(skb)->nr_frags); |
| 3116 | } |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3117 | } |
| 3118 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3119 | ok: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3120 | return ret; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3121 | |
| 3122 | normal: |
Herbert Xu | ad0f990 | 2009-02-01 01:24:55 -0800 | [diff] [blame] | 3123 | ret = GRO_NORMAL; |
| 3124 | goto pull; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3125 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3126 | EXPORT_SYMBOL(dev_gro_receive); |
| 3127 | |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3128 | static gro_result_t |
| 3129 | __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3130 | { |
| 3131 | struct sk_buff *p; |
| 3132 | |
Herbert Xu | d1c76af | 2009-03-16 10:50:02 -0700 | [diff] [blame] | 3133 | if (netpoll_rx_on(skb)) |
| 3134 | return GRO_NORMAL; |
| 3135 | |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3136 | for (p = napi->gro_list; p; p = p->next) { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 3137 | NAPI_GRO_CB(p)->same_flow = |
| 3138 | (p->dev == skb->dev) && |
| 3139 | !compare_ether_header(skb_mac_header(p), |
| 3140 | skb_gro_mac_header(skb)); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3141 | NAPI_GRO_CB(p)->flush = 0; |
| 3142 | } |
| 3143 | |
| 3144 | return dev_gro_receive(napi, skb); |
| 3145 | } |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3146 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3147 | 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] | 3148 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3149 | switch (ret) { |
| 3150 | case GRO_NORMAL: |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3151 | if (netif_receive_skb(skb)) |
| 3152 | ret = GRO_DROP; |
| 3153 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3154 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3155 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3156 | case GRO_MERGED_FREE: |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3157 | kfree_skb(skb); |
| 3158 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3159 | |
| 3160 | case GRO_HELD: |
| 3161 | case GRO_MERGED: |
| 3162 | break; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3163 | } |
| 3164 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3165 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3166 | } |
| 3167 | EXPORT_SYMBOL(napi_skb_finish); |
| 3168 | |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3169 | void skb_gro_reset_offset(struct sk_buff *skb) |
| 3170 | { |
| 3171 | NAPI_GRO_CB(skb)->data_offset = 0; |
| 3172 | NAPI_GRO_CB(skb)->frag0 = NULL; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3173 | NAPI_GRO_CB(skb)->frag0_len = 0; |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3174 | |
Herbert Xu | 78d3fd0 | 2009-05-26 18:50:23 +0000 | [diff] [blame] | 3175 | if (skb->mac_header == skb->tail && |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3176 | !PageHighMem(skb_shinfo(skb)->frags[0].page)) { |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3177 | NAPI_GRO_CB(skb)->frag0 = |
| 3178 | page_address(skb_shinfo(skb)->frags[0].page) + |
| 3179 | skb_shinfo(skb)->frags[0].page_offset; |
Herbert Xu | 7489594 | 2009-05-26 18:50:27 +0000 | [diff] [blame] | 3180 | NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size; |
| 3181 | } |
Herbert Xu | 78a478d | 2009-05-26 18:50:21 +0000 | [diff] [blame] | 3182 | } |
| 3183 | EXPORT_SYMBOL(skb_gro_reset_offset); |
| 3184 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3185 | 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] | 3186 | { |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3187 | skb_gro_reset_offset(skb); |
| 3188 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3189 | return napi_skb_finish(__napi_gro_receive(napi, skb), skb); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3190 | } |
| 3191 | EXPORT_SYMBOL(napi_gro_receive); |
| 3192 | |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3193 | void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
| 3194 | { |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3195 | __skb_pull(skb, skb_headlen(skb)); |
| 3196 | skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); |
| 3197 | |
| 3198 | napi->skb = skb; |
| 3199 | } |
| 3200 | EXPORT_SYMBOL(napi_reuse_skb); |
| 3201 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3202 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3203 | { |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3204 | struct sk_buff *skb = napi->skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3205 | |
| 3206 | if (!skb) { |
Eric Dumazet | 89d71a6 | 2009-10-13 05:34:20 +0000 | [diff] [blame] | 3207 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
| 3208 | if (skb) |
| 3209 | napi->skb = skb; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3210 | } |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3211 | return skb; |
| 3212 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3213 | EXPORT_SYMBOL(napi_get_frags); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3214 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3215 | gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
| 3216 | gro_result_t ret) |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3217 | { |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3218 | switch (ret) { |
| 3219 | case GRO_NORMAL: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3220 | case GRO_HELD: |
Ajit Khaparde | e76b69c | 2010-02-16 20:25:43 +0000 | [diff] [blame] | 3221 | skb->protocol = eth_type_trans(skb, skb->dev); |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3222 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3223 | if (ret == GRO_HELD) |
| 3224 | skb_gro_pull(skb, -ETH_HLEN); |
| 3225 | else if (netif_receive_skb(skb)) |
| 3226 | ret = GRO_DROP; |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 3227 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3228 | |
| 3229 | case GRO_DROP: |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3230 | case GRO_MERGED_FREE: |
| 3231 | napi_reuse_skb(napi, skb); |
| 3232 | break; |
Ben Hutchings | 5b252f0 | 2009-10-29 07:17:09 +0000 | [diff] [blame] | 3233 | |
| 3234 | case GRO_MERGED: |
| 3235 | break; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3236 | } |
| 3237 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3238 | return ret; |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3239 | } |
| 3240 | EXPORT_SYMBOL(napi_frags_finish); |
| 3241 | |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3242 | struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3243 | { |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3244 | struct sk_buff *skb = napi->skb; |
| 3245 | struct ethhdr *eth; |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 3246 | unsigned int hlen; |
| 3247 | unsigned int off; |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3248 | |
| 3249 | napi->skb = NULL; |
| 3250 | |
| 3251 | skb_reset_mac_header(skb); |
| 3252 | skb_gro_reset_offset(skb); |
| 3253 | |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 3254 | off = skb_gro_offset(skb); |
| 3255 | hlen = off + sizeof(*eth); |
| 3256 | eth = skb_gro_header_fast(skb, off); |
| 3257 | if (skb_gro_header_hard(skb, hlen)) { |
| 3258 | eth = skb_gro_header_slow(skb, hlen, off); |
| 3259 | if (unlikely(!eth)) { |
| 3260 | napi_reuse_skb(napi, skb); |
| 3261 | skb = NULL; |
| 3262 | goto out; |
| 3263 | } |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3264 | } |
| 3265 | |
| 3266 | skb_gro_pull(skb, sizeof(*eth)); |
| 3267 | |
| 3268 | /* |
| 3269 | * This works because the only protocols we care about don't require |
| 3270 | * special handling. We'll fix it up properly at the end. |
| 3271 | */ |
| 3272 | skb->protocol = eth->h_proto; |
| 3273 | |
| 3274 | out: |
| 3275 | return skb; |
| 3276 | } |
| 3277 | EXPORT_SYMBOL(napi_frags_skb); |
| 3278 | |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3279 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3280 | { |
| 3281 | struct sk_buff *skb = napi_frags_skb(napi); |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3282 | |
| 3283 | if (!skb) |
Ben Hutchings | c7c4b3b | 2009-10-29 21:36:53 -0700 | [diff] [blame] | 3284 | return GRO_DROP; |
Herbert Xu | 96e93ea | 2009-01-06 10:49:34 -0800 | [diff] [blame] | 3285 | |
Herbert Xu | 5d0d9be | 2009-01-29 14:19:48 +0000 | [diff] [blame] | 3286 | return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb)); |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3287 | } |
| 3288 | EXPORT_SYMBOL(napi_gro_frags); |
| 3289 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3290 | /* |
| 3291 | * net_rps_action sends any pending IPI's for rps. |
| 3292 | * Note: called with local irq disabled, but exits with local irq enabled. |
| 3293 | */ |
| 3294 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) |
| 3295 | { |
| 3296 | #ifdef CONFIG_RPS |
| 3297 | struct softnet_data *remsd = sd->rps_ipi_list; |
| 3298 | |
| 3299 | if (remsd) { |
| 3300 | sd->rps_ipi_list = NULL; |
| 3301 | |
| 3302 | local_irq_enable(); |
| 3303 | |
| 3304 | /* Send pending IPI's to kick RPS processing on remote cpus. */ |
| 3305 | while (remsd) { |
| 3306 | struct softnet_data *next = remsd->rps_ipi_next; |
| 3307 | |
| 3308 | if (cpu_online(remsd->cpu)) |
| 3309 | __smp_call_function_single(remsd->cpu, |
| 3310 | &remsd->csd, 0); |
| 3311 | remsd = next; |
| 3312 | } |
| 3313 | } else |
| 3314 | #endif |
| 3315 | local_irq_enable(); |
| 3316 | } |
| 3317 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3318 | static int process_backlog(struct napi_struct *napi, int quota) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3319 | { |
| 3320 | int work = 0; |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3321 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3322 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3323 | #ifdef CONFIG_RPS |
| 3324 | /* Check if we have pending ipi, its better to send them now, |
| 3325 | * not waiting net_rx_action() end. |
| 3326 | */ |
| 3327 | if (sd->rps_ipi_list) { |
| 3328 | local_irq_disable(); |
| 3329 | net_rps_action_and_irq_enable(sd); |
| 3330 | } |
| 3331 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3332 | napi->weight = weight_p; |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3333 | local_irq_disable(); |
| 3334 | while (work < quota) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3335 | struct sk_buff *skb; |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3336 | unsigned int qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3337 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3338 | while ((skb = __skb_dequeue(&sd->process_queue))) { |
Eric Dumazet | e400827 | 2010-04-05 15:42:39 -0700 | [diff] [blame] | 3339 | local_irq_enable(); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3340 | __netif_receive_skb(skb); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3341 | local_irq_disable(); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3342 | input_queue_head_incr(sd); |
| 3343 | if (++work >= quota) { |
| 3344 | local_irq_enable(); |
| 3345 | return work; |
| 3346 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3347 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3348 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3349 | rps_lock(sd); |
| 3350 | qlen = skb_queue_len(&sd->input_pkt_queue); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3351 | if (qlen) |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3352 | skb_queue_splice_tail_init(&sd->input_pkt_queue, |
| 3353 | &sd->process_queue); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 3354 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3355 | if (qlen < quota - work) { |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3356 | /* |
| 3357 | * Inline a custom version of __napi_complete(). |
| 3358 | * only current cpu owns and manipulates this napi, |
| 3359 | * and NAPI_STATE_SCHED is the only possible flag set on backlog. |
| 3360 | * we can use a plain write instead of clear_bit(), |
| 3361 | * and we dont need an smp_mb() memory barrier. |
| 3362 | */ |
| 3363 | list_del(&napi->poll_list); |
| 3364 | napi->state = 0; |
| 3365 | |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 3366 | quota = work + qlen; |
| 3367 | } |
| 3368 | rps_unlock(sd); |
| 3369 | } |
| 3370 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3371 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3372 | return work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3373 | } |
| 3374 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3375 | /** |
| 3376 | * __napi_schedule - schedule for receive |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 3377 | * @n: entry to schedule |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3378 | * |
| 3379 | * The entry's receive function will be scheduled to run |
| 3380 | */ |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 3381 | void __napi_schedule(struct napi_struct *n) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3382 | { |
| 3383 | unsigned long flags; |
| 3384 | |
| 3385 | local_irq_save(flags); |
Eric Dumazet | eecfd7c | 2010-05-06 22:07:48 -0700 | [diff] [blame] | 3386 | ____napi_schedule(&__get_cpu_var(softnet_data), n); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3387 | local_irq_restore(flags); |
| 3388 | } |
| 3389 | EXPORT_SYMBOL(__napi_schedule); |
| 3390 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3391 | void __napi_complete(struct napi_struct *n) |
| 3392 | { |
| 3393 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); |
| 3394 | BUG_ON(n->gro_list); |
| 3395 | |
| 3396 | list_del(&n->poll_list); |
| 3397 | smp_mb__before_clear_bit(); |
| 3398 | clear_bit(NAPI_STATE_SCHED, &n->state); |
| 3399 | } |
| 3400 | EXPORT_SYMBOL(__napi_complete); |
| 3401 | |
| 3402 | void napi_complete(struct napi_struct *n) |
| 3403 | { |
| 3404 | unsigned long flags; |
| 3405 | |
| 3406 | /* |
| 3407 | * don't let napi dequeue from the cpu poll list |
| 3408 | * just in case its running on a different cpu |
| 3409 | */ |
| 3410 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) |
| 3411 | return; |
| 3412 | |
| 3413 | napi_gro_flush(n); |
| 3414 | local_irq_save(flags); |
| 3415 | __napi_complete(n); |
| 3416 | local_irq_restore(flags); |
| 3417 | } |
| 3418 | EXPORT_SYMBOL(napi_complete); |
| 3419 | |
| 3420 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
| 3421 | int (*poll)(struct napi_struct *, int), int weight) |
| 3422 | { |
| 3423 | INIT_LIST_HEAD(&napi->poll_list); |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3424 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3425 | napi->gro_list = NULL; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3426 | napi->skb = NULL; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3427 | napi->poll = poll; |
| 3428 | napi->weight = weight; |
| 3429 | list_add(&napi->dev_list, &dev->napi_list); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3430 | napi->dev = dev; |
Herbert Xu | 5d38a07 | 2009-01-04 16:13:40 -0800 | [diff] [blame] | 3431 | #ifdef CONFIG_NETPOLL |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3432 | spin_lock_init(&napi->poll_lock); |
| 3433 | napi->poll_owner = -1; |
| 3434 | #endif |
| 3435 | set_bit(NAPI_STATE_SCHED, &napi->state); |
| 3436 | } |
| 3437 | EXPORT_SYMBOL(netif_napi_add); |
| 3438 | |
| 3439 | void netif_napi_del(struct napi_struct *napi) |
| 3440 | { |
| 3441 | struct sk_buff *skb, *next; |
| 3442 | |
Peter P Waskiewicz Jr | d7b0663 | 2008-12-26 01:35:35 -0800 | [diff] [blame] | 3443 | list_del_init(&napi->dev_list); |
Herbert Xu | 76620aa | 2009-04-16 02:02:07 -0700 | [diff] [blame] | 3444 | napi_free_frags(napi); |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3445 | |
| 3446 | for (skb = napi->gro_list; skb; skb = next) { |
| 3447 | next = skb->next; |
| 3448 | skb->next = NULL; |
| 3449 | kfree_skb(skb); |
| 3450 | } |
| 3451 | |
| 3452 | napi->gro_list = NULL; |
Herbert Xu | 4ae5544 | 2009-02-08 18:00:36 +0000 | [diff] [blame] | 3453 | napi->gro_count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 3454 | } |
| 3455 | EXPORT_SYMBOL(netif_napi_del); |
| 3456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3457 | static void net_rx_action(struct softirq_action *h) |
| 3458 | { |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3459 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3460 | unsigned long time_limit = jiffies + 2; |
Stephen Hemminger | 51b0bde | 2005-06-23 20:14:40 -0700 | [diff] [blame] | 3461 | int budget = netdev_budget; |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 3462 | void *have; |
| 3463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3464 | local_irq_disable(); |
| 3465 | |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3466 | while (!list_empty(&sd->poll_list)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3467 | struct napi_struct *n; |
| 3468 | int work, weight; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3469 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3470 | /* If softirq window is exhuasted then punt. |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3471 | * Allow this to run for 2 jiffies since which will allow |
| 3472 | * an average latency of 1.5/HZ. |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3473 | */ |
Stephen Hemminger | 24f8b23 | 2008-11-03 17:14:38 -0800 | [diff] [blame] | 3474 | if (unlikely(budget <= 0 || time_after(jiffies, time_limit))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3475 | goto softnet_break; |
| 3476 | |
| 3477 | local_irq_enable(); |
| 3478 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3479 | /* Even though interrupts have been re-enabled, this |
| 3480 | * access is safe because interrupts can only add new |
| 3481 | * entries to the tail of this list, and only ->poll() |
| 3482 | * calls can remove this head entry from the list. |
| 3483 | */ |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3484 | n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3485 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3486 | have = netpoll_poll_lock(n); |
| 3487 | |
| 3488 | weight = n->weight; |
| 3489 | |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 3490 | /* This NAPI_STATE_SCHED test is for avoiding a race |
| 3491 | * with netpoll's poll_napi(). Only the entity which |
| 3492 | * obtains the lock and sees NAPI_STATE_SCHED set will |
| 3493 | * actually make the ->poll() call. Therefore we avoid |
| 3494 | * accidently calling ->poll() when NAPI is not scheduled. |
| 3495 | */ |
| 3496 | work = 0; |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 3497 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 3498 | work = n->poll(n, weight); |
Neil Horman | 4ea7e38 | 2009-05-21 07:36:08 +0000 | [diff] [blame] | 3499 | trace_napi_poll(n); |
| 3500 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3501 | |
| 3502 | WARN_ON_ONCE(work > weight); |
| 3503 | |
| 3504 | budget -= work; |
| 3505 | |
| 3506 | local_irq_disable(); |
| 3507 | |
| 3508 | /* Drivers must not modify the NAPI state if they |
| 3509 | * consume the entire weight. In such cases this code |
| 3510 | * still "owns" the NAPI instance and therefore can |
| 3511 | * move the instance around on the list at-will. |
| 3512 | */ |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 3513 | if (unlikely(work == weight)) { |
Herbert Xu | ff780cd | 2009-06-26 19:27:04 -0700 | [diff] [blame] | 3514 | if (unlikely(napi_disable_pending(n))) { |
| 3515 | local_irq_enable(); |
| 3516 | napi_complete(n); |
| 3517 | local_irq_disable(); |
| 3518 | } else |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3519 | list_move_tail(&n->poll_list, &sd->poll_list); |
David S. Miller | fed17f3 | 2008-01-07 21:00:40 -0800 | [diff] [blame] | 3520 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3521 | |
| 3522 | netpoll_poll_unlock(have); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3523 | } |
| 3524 | out: |
Eric Dumazet | e326bed | 2010-04-22 00:22:45 -0700 | [diff] [blame] | 3525 | net_rps_action_and_irq_enable(sd); |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3526 | |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 3527 | #ifdef CONFIG_NET_DMA |
| 3528 | /* |
| 3529 | * There may not be any more sk_buffs coming right now, so push |
| 3530 | * any pending DMA copies to hardware |
| 3531 | */ |
Dan Williams | 2ba0562 | 2009-01-06 11:38:14 -0700 | [diff] [blame] | 3532 | dma_issue_pending_all(); |
Chris Leech | db21733 | 2006-06-17 21:24:58 -0700 | [diff] [blame] | 3533 | #endif |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3535 | return; |
| 3536 | |
| 3537 | softnet_break: |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3538 | sd->time_squeeze++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3539 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| 3540 | goto out; |
| 3541 | } |
| 3542 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3543 | static gifconf_func_t *gifconf_list[NPROTO]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3544 | |
| 3545 | /** |
| 3546 | * register_gifconf - register a SIOCGIF handler |
| 3547 | * @family: Address family |
| 3548 | * @gifconf: Function handler |
| 3549 | * |
| 3550 | * Register protocol dependent address dumping routines. The handler |
| 3551 | * that is passed must not be freed or reused until it has been replaced |
| 3552 | * by another handler. |
| 3553 | */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3554 | int register_gifconf(unsigned int family, gifconf_func_t *gifconf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3555 | { |
| 3556 | if (family >= NPROTO) |
| 3557 | return -EINVAL; |
| 3558 | gifconf_list[family] = gifconf; |
| 3559 | return 0; |
| 3560 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 3561 | EXPORT_SYMBOL(register_gifconf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3562 | |
| 3563 | |
| 3564 | /* |
| 3565 | * Map an interface index to its name (SIOCGIFNAME) |
| 3566 | */ |
| 3567 | |
| 3568 | /* |
| 3569 | * We need this ioctl for efficient implementation of the |
| 3570 | * if_indextoname() function required by the IPv6 API. Without |
| 3571 | * it, we would have to search all the interfaces to find a |
| 3572 | * match. --pb |
| 3573 | */ |
| 3574 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3575 | static int dev_ifname(struct net *net, struct ifreq __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3576 | { |
| 3577 | struct net_device *dev; |
| 3578 | struct ifreq ifr; |
| 3579 | |
| 3580 | /* |
| 3581 | * Fetch the caller's info block. |
| 3582 | */ |
| 3583 | |
| 3584 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 3585 | return -EFAULT; |
| 3586 | |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3587 | rcu_read_lock(); |
| 3588 | dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3589 | if (!dev) { |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3590 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3591 | return -ENODEV; |
| 3592 | } |
| 3593 | |
| 3594 | strcpy(ifr.ifr_name, dev->name); |
Eric Dumazet | fb699dfd | 2009-10-19 19:18:49 +0000 | [diff] [blame] | 3595 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3596 | |
| 3597 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) |
| 3598 | return -EFAULT; |
| 3599 | return 0; |
| 3600 | } |
| 3601 | |
| 3602 | /* |
| 3603 | * Perform a SIOCGIFCONF call. This structure will change |
| 3604 | * size eventually, and there is nothing I can do about it. |
| 3605 | * Thus we will need a 'compatibility mode'. |
| 3606 | */ |
| 3607 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3608 | static int dev_ifconf(struct net *net, char __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3609 | { |
| 3610 | struct ifconf ifc; |
| 3611 | struct net_device *dev; |
| 3612 | char __user *pos; |
| 3613 | int len; |
| 3614 | int total; |
| 3615 | int i; |
| 3616 | |
| 3617 | /* |
| 3618 | * Fetch the caller's info block. |
| 3619 | */ |
| 3620 | |
| 3621 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) |
| 3622 | return -EFAULT; |
| 3623 | |
| 3624 | pos = ifc.ifc_buf; |
| 3625 | len = ifc.ifc_len; |
| 3626 | |
| 3627 | /* |
| 3628 | * Loop over the interfaces, and write an info block for each. |
| 3629 | */ |
| 3630 | |
| 3631 | total = 0; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3632 | for_each_netdev(net, dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3633 | for (i = 0; i < NPROTO; i++) { |
| 3634 | if (gifconf_list[i]) { |
| 3635 | int done; |
| 3636 | if (!pos) |
| 3637 | done = gifconf_list[i](dev, NULL, 0); |
| 3638 | else |
| 3639 | done = gifconf_list[i](dev, pos + total, |
| 3640 | len - total); |
| 3641 | if (done < 0) |
| 3642 | return -EFAULT; |
| 3643 | total += done; |
| 3644 | } |
| 3645 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3646 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3647 | |
| 3648 | /* |
| 3649 | * All done. Write the updated control block back to the caller. |
| 3650 | */ |
| 3651 | ifc.ifc_len = total; |
| 3652 | |
| 3653 | /* |
| 3654 | * Both BSD and Solaris return 0 here, so we do too. |
| 3655 | */ |
| 3656 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; |
| 3657 | } |
| 3658 | |
| 3659 | #ifdef CONFIG_PROC_FS |
| 3660 | /* |
| 3661 | * This is invoked by the /proc filesystem handler to display a device |
| 3662 | * in detail. |
| 3663 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3664 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3665 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3666 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3667 | struct net *net = seq_file_net(seq); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3668 | loff_t off; |
| 3669 | struct net_device *dev; |
| 3670 | |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3671 | rcu_read_lock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3672 | if (!*pos) |
| 3673 | return SEQ_START_TOKEN; |
| 3674 | |
| 3675 | off = 1; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3676 | for_each_netdev_rcu(net, dev) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 3677 | if (off++ == *pos) |
| 3678 | return dev; |
| 3679 | |
| 3680 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3681 | } |
| 3682 | |
| 3683 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3684 | { |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3685 | struct net_device *dev = (v == SEQ_START_TOKEN) ? |
| 3686 | first_net_device(seq_file_net(seq)) : |
| 3687 | next_net_device((struct net_device *)v); |
| 3688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3689 | ++*pos; |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3690 | return rcu_dereference(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3691 | } |
| 3692 | |
| 3693 | void dev_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3694 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3695 | { |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 3696 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3697 | } |
| 3698 | |
| 3699 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) |
| 3700 | { |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 3701 | const struct net_device_stats *stats = dev_get_stats(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3702 | |
Jesper Dangaard Brouer | 2d13baf | 2010-01-05 05:50:52 +0000 | [diff] [blame] | 3703 | seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
Rusty Russell | 5a1b589 | 2007-04-28 21:04:03 -0700 | [diff] [blame] | 3704 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", |
| 3705 | dev->name, stats->rx_bytes, stats->rx_packets, |
| 3706 | stats->rx_errors, |
| 3707 | stats->rx_dropped + stats->rx_missed_errors, |
| 3708 | stats->rx_fifo_errors, |
| 3709 | stats->rx_length_errors + stats->rx_over_errors + |
| 3710 | stats->rx_crc_errors + stats->rx_frame_errors, |
| 3711 | stats->rx_compressed, stats->multicast, |
| 3712 | stats->tx_bytes, stats->tx_packets, |
| 3713 | stats->tx_errors, stats->tx_dropped, |
| 3714 | stats->tx_fifo_errors, stats->collisions, |
| 3715 | stats->tx_carrier_errors + |
| 3716 | stats->tx_aborted_errors + |
| 3717 | stats->tx_window_errors + |
| 3718 | stats->tx_heartbeat_errors, |
| 3719 | stats->tx_compressed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3720 | } |
| 3721 | |
| 3722 | /* |
| 3723 | * Called from the PROCfs module. This now uses the new arbitrary sized |
| 3724 | * /proc/net interface to create /proc/net/dev |
| 3725 | */ |
| 3726 | static int dev_seq_show(struct seq_file *seq, void *v) |
| 3727 | { |
| 3728 | if (v == SEQ_START_TOKEN) |
| 3729 | seq_puts(seq, "Inter-| Receive " |
| 3730 | " | Transmit\n" |
| 3731 | " face |bytes packets errs drop fifo frame " |
| 3732 | "compressed multicast|bytes packets errs " |
| 3733 | "drop fifo colls carrier compressed\n"); |
| 3734 | else |
| 3735 | dev_seq_printf_stats(seq, v); |
| 3736 | return 0; |
| 3737 | } |
| 3738 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3739 | static struct softnet_data *softnet_get_online(loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3740 | { |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3741 | struct softnet_data *sd = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3742 | |
Mike Travis | 0c0b0ac | 2008-05-02 16:43:08 -0700 | [diff] [blame] | 3743 | while (*pos < nr_cpu_ids) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3744 | if (cpu_online(*pos)) { |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3745 | sd = &per_cpu(softnet_data, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3746 | break; |
| 3747 | } else |
| 3748 | ++*pos; |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3749 | return sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3750 | } |
| 3751 | |
| 3752 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) |
| 3753 | { |
| 3754 | return softnet_get_online(pos); |
| 3755 | } |
| 3756 | |
| 3757 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3758 | { |
| 3759 | ++*pos; |
| 3760 | return softnet_get_online(pos); |
| 3761 | } |
| 3762 | |
| 3763 | static void softnet_seq_stop(struct seq_file *seq, void *v) |
| 3764 | { |
| 3765 | } |
| 3766 | |
| 3767 | static int softnet_seq_show(struct seq_file *seq, void *v) |
| 3768 | { |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3769 | struct softnet_data *sd = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3770 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 3771 | 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] | 3772 | sd->processed, sd->dropped, sd->time_squeeze, 0, |
Stephen Hemminger | c1ebcdb | 2005-06-23 20:08:59 -0700 | [diff] [blame] | 3773 | 0, 0, 0, 0, /* was fastroute */ |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 3774 | sd->cpu_collision, sd->received_rps); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3775 | return 0; |
| 3776 | } |
| 3777 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 3778 | static const struct seq_operations dev_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3779 | .start = dev_seq_start, |
| 3780 | .next = dev_seq_next, |
| 3781 | .stop = dev_seq_stop, |
| 3782 | .show = dev_seq_show, |
| 3783 | }; |
| 3784 | |
| 3785 | static int dev_seq_open(struct inode *inode, struct file *file) |
| 3786 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3787 | return seq_open_net(inode, file, &dev_seq_ops, |
| 3788 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3789 | } |
| 3790 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 3791 | static const struct file_operations dev_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3792 | .owner = THIS_MODULE, |
| 3793 | .open = dev_seq_open, |
| 3794 | .read = seq_read, |
| 3795 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3796 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3797 | }; |
| 3798 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 3799 | static const struct seq_operations softnet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3800 | .start = softnet_seq_start, |
| 3801 | .next = softnet_seq_next, |
| 3802 | .stop = softnet_seq_stop, |
| 3803 | .show = softnet_seq_show, |
| 3804 | }; |
| 3805 | |
| 3806 | static int softnet_seq_open(struct inode *inode, struct file *file) |
| 3807 | { |
| 3808 | return seq_open(file, &softnet_seq_ops); |
| 3809 | } |
| 3810 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 3811 | static const struct file_operations softnet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3812 | .owner = THIS_MODULE, |
| 3813 | .open = softnet_seq_open, |
| 3814 | .read = seq_read, |
| 3815 | .llseek = seq_lseek, |
| 3816 | .release = seq_release, |
| 3817 | }; |
| 3818 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3819 | static void *ptype_get_idx(loff_t pos) |
| 3820 | { |
| 3821 | struct packet_type *pt = NULL; |
| 3822 | loff_t i = 0; |
| 3823 | int t; |
| 3824 | |
| 3825 | list_for_each_entry_rcu(pt, &ptype_all, list) { |
| 3826 | if (i == pos) |
| 3827 | return pt; |
| 3828 | ++i; |
| 3829 | } |
| 3830 | |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3831 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3832 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
| 3833 | if (i == pos) |
| 3834 | return pt; |
| 3835 | ++i; |
| 3836 | } |
| 3837 | } |
| 3838 | return NULL; |
| 3839 | } |
| 3840 | |
| 3841 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 3842 | __acquires(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3843 | { |
| 3844 | rcu_read_lock(); |
| 3845 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; |
| 3846 | } |
| 3847 | |
| 3848 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 3849 | { |
| 3850 | struct packet_type *pt; |
| 3851 | struct list_head *nxt; |
| 3852 | int hash; |
| 3853 | |
| 3854 | ++*pos; |
| 3855 | if (v == SEQ_START_TOKEN) |
| 3856 | return ptype_get_idx(0); |
| 3857 | |
| 3858 | pt = v; |
| 3859 | nxt = pt->list.next; |
| 3860 | if (pt->type == htons(ETH_P_ALL)) { |
| 3861 | if (nxt != &ptype_all) |
| 3862 | goto found; |
| 3863 | hash = 0; |
| 3864 | nxt = ptype_base[0].next; |
| 3865 | } else |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3866 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3867 | |
| 3868 | while (nxt == &ptype_base[hash]) { |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 3869 | if (++hash >= PTYPE_HASH_SIZE) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3870 | return NULL; |
| 3871 | nxt = ptype_base[hash].next; |
| 3872 | } |
| 3873 | found: |
| 3874 | return list_entry(nxt, struct packet_type, list); |
| 3875 | } |
| 3876 | |
| 3877 | static void ptype_seq_stop(struct seq_file *seq, void *v) |
Stephen Hemminger | 72348a4 | 2008-01-21 02:27:29 -0800 | [diff] [blame] | 3878 | __releases(RCU) |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3879 | { |
| 3880 | rcu_read_unlock(); |
| 3881 | } |
| 3882 | |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3883 | static int ptype_seq_show(struct seq_file *seq, void *v) |
| 3884 | { |
| 3885 | struct packet_type *pt = v; |
| 3886 | |
| 3887 | if (v == SEQ_START_TOKEN) |
| 3888 | seq_puts(seq, "Type Device Function\n"); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 3889 | 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] | 3890 | if (pt->type == htons(ETH_P_ALL)) |
| 3891 | seq_puts(seq, "ALL "); |
| 3892 | else |
| 3893 | seq_printf(seq, "%04x", ntohs(pt->type)); |
| 3894 | |
Alexey Dobriyan | 908cd2d | 2008-11-16 19:50:35 -0800 | [diff] [blame] | 3895 | seq_printf(seq, " %-8s %pF\n", |
| 3896 | pt->dev ? pt->dev->name : "", pt->func); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3897 | } |
| 3898 | |
| 3899 | return 0; |
| 3900 | } |
| 3901 | |
| 3902 | static const struct seq_operations ptype_seq_ops = { |
| 3903 | .start = ptype_seq_start, |
| 3904 | .next = ptype_seq_next, |
| 3905 | .stop = ptype_seq_stop, |
| 3906 | .show = ptype_seq_show, |
| 3907 | }; |
| 3908 | |
| 3909 | static int ptype_seq_open(struct inode *inode, struct file *file) |
| 3910 | { |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 3911 | return seq_open_net(inode, file, &ptype_seq_ops, |
| 3912 | sizeof(struct seq_net_private)); |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3913 | } |
| 3914 | |
| 3915 | static const struct file_operations ptype_seq_fops = { |
| 3916 | .owner = THIS_MODULE, |
| 3917 | .open = ptype_seq_open, |
| 3918 | .read = seq_read, |
| 3919 | .llseek = seq_lseek, |
Pavel Emelyanov | 2feb27d | 2008-03-24 14:57:45 -0700 | [diff] [blame] | 3920 | .release = seq_release_net, |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3921 | }; |
| 3922 | |
| 3923 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3924 | static int __net_init dev_proc_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3925 | { |
| 3926 | int rc = -ENOMEM; |
| 3927 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3928 | if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3929 | goto out; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3930 | 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] | 3931 | goto out_dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3932 | 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] | 3933 | goto out_softnet; |
Stephen Hemminger | 0e1256f | 2007-03-12 14:35:37 -0700 | [diff] [blame] | 3934 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3935 | if (wext_proc_init(net)) |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 3936 | goto out_ptype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3937 | rc = 0; |
| 3938 | out: |
| 3939 | return rc; |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 3940 | out_ptype: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3941 | proc_net_remove(net, "ptype"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3942 | out_softnet: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3943 | proc_net_remove(net, "softnet_stat"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3944 | out_dev: |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3945 | proc_net_remove(net, "dev"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3946 | goto out; |
| 3947 | } |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3948 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3949 | static void __net_exit dev_proc_net_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3950 | { |
| 3951 | wext_proc_exit(net); |
| 3952 | |
| 3953 | proc_net_remove(net, "ptype"); |
| 3954 | proc_net_remove(net, "softnet_stat"); |
| 3955 | proc_net_remove(net, "dev"); |
| 3956 | } |
| 3957 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 3958 | static struct pernet_operations __net_initdata dev_proc_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 3959 | .init = dev_proc_net_init, |
| 3960 | .exit = dev_proc_net_exit, |
| 3961 | }; |
| 3962 | |
| 3963 | static int __init dev_proc_init(void) |
| 3964 | { |
| 3965 | return register_pernet_subsys(&dev_proc_ops); |
| 3966 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3967 | #else |
| 3968 | #define dev_proc_init() 0 |
| 3969 | #endif /* CONFIG_PROC_FS */ |
| 3970 | |
| 3971 | |
| 3972 | /** |
| 3973 | * netdev_set_master - set up master/slave pair |
| 3974 | * @slave: slave device |
| 3975 | * @master: new master device |
| 3976 | * |
| 3977 | * Changes the master device of the slave. Pass %NULL to break the |
| 3978 | * bonding. The caller must hold the RTNL semaphore. On a failure |
| 3979 | * a negative errno code is returned. On success the reference counts |
| 3980 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the |
| 3981 | * function returns zero. |
| 3982 | */ |
| 3983 | int netdev_set_master(struct net_device *slave, struct net_device *master) |
| 3984 | { |
| 3985 | struct net_device *old = slave->master; |
| 3986 | |
| 3987 | ASSERT_RTNL(); |
| 3988 | |
| 3989 | if (master) { |
| 3990 | if (old) |
| 3991 | return -EBUSY; |
| 3992 | dev_hold(master); |
| 3993 | } |
| 3994 | |
| 3995 | slave->master = master; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 3996 | |
Eric Dumazet | 283f2fe | 2010-03-18 13:37:40 +0000 | [diff] [blame] | 3997 | if (old) { |
| 3998 | synchronize_net(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3999 | dev_put(old); |
Eric Dumazet | 283f2fe | 2010-03-18 13:37:40 +0000 | [diff] [blame] | 4000 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4001 | if (master) |
| 4002 | slave->flags |= IFF_SLAVE; |
| 4003 | else |
| 4004 | slave->flags &= ~IFF_SLAVE; |
| 4005 | |
| 4006 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); |
| 4007 | return 0; |
| 4008 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4009 | EXPORT_SYMBOL(netdev_set_master); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4010 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4011 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
| 4012 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4013 | const struct net_device_ops *ops = dev->netdev_ops; |
| 4014 | |
| 4015 | if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags) |
| 4016 | ops->ndo_change_rx_flags(dev, flags); |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4017 | } |
| 4018 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4019 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4020 | { |
| 4021 | unsigned short old_flags = dev->flags; |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4022 | uid_t uid; |
| 4023 | gid_t gid; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4024 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4025 | ASSERT_RTNL(); |
| 4026 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4027 | dev->flags |= IFF_PROMISC; |
| 4028 | dev->promiscuity += inc; |
| 4029 | if (dev->promiscuity == 0) { |
| 4030 | /* |
| 4031 | * Avoid overflow. |
| 4032 | * If inc causes overflow, untouch promisc and return error. |
| 4033 | */ |
| 4034 | if (inc < 0) |
| 4035 | dev->flags &= ~IFF_PROMISC; |
| 4036 | else { |
| 4037 | dev->promiscuity -= inc; |
| 4038 | printk(KERN_WARNING "%s: promiscuity touches roof, " |
| 4039 | "set promiscuity failed, promiscuity feature " |
| 4040 | "of device might be broken.\n", dev->name); |
| 4041 | return -EOVERFLOW; |
| 4042 | } |
| 4043 | } |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4044 | if (dev->flags != old_flags) { |
| 4045 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
| 4046 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : |
| 4047 | "left"); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4048 | if (audit_enabled) { |
| 4049 | current_uid_gid(&uid, &gid); |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 4050 | audit_log(current->audit_context, GFP_ATOMIC, |
| 4051 | AUDIT_ANOM_PROMISCUOUS, |
| 4052 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", |
| 4053 | dev->name, (dev->flags & IFF_PROMISC), |
| 4054 | (old_flags & IFF_PROMISC), |
| 4055 | audit_get_loginuid(current), |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4056 | uid, gid, |
Klaus Heinrich Kiwi | 7759db8 | 2008-01-23 22:57:45 -0500 | [diff] [blame] | 4057 | audit_get_sessionid(current)); |
David Howells | 8192b0c | 2008-11-14 10:39:10 +1100 | [diff] [blame] | 4058 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4059 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4060 | dev_change_rx_flags(dev, IFF_PROMISC); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4061 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4062 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4063 | } |
| 4064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4065 | /** |
| 4066 | * dev_set_promiscuity - update promiscuity count on a device |
| 4067 | * @dev: device |
| 4068 | * @inc: modifier |
| 4069 | * |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 4070 | * 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] | 4071 | * remains above zero the interface remains promiscuous. Once it hits zero |
| 4072 | * the device reverts back to normal filtering operation. A negative inc |
| 4073 | * value is used to drop promiscuity on the device. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4074 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4075 | */ |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4076 | int dev_set_promiscuity(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4077 | { |
| 4078 | unsigned short old_flags = dev->flags; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4079 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4080 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4081 | err = __dev_set_promiscuity(dev, inc); |
Patrick McHardy | 4b5a698 | 2008-07-06 15:49:08 -0700 | [diff] [blame] | 4082 | if (err < 0) |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4083 | return err; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4084 | if (dev->flags != old_flags) |
| 4085 | dev_set_rx_mode(dev); |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4086 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4087 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4088 | EXPORT_SYMBOL(dev_set_promiscuity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4089 | |
| 4090 | /** |
| 4091 | * dev_set_allmulti - update allmulti count on a device |
| 4092 | * @dev: device |
| 4093 | * @inc: modifier |
| 4094 | * |
| 4095 | * Add or remove reception of all multicast frames to a device. While the |
| 4096 | * count in the device remains above zero the interface remains listening |
| 4097 | * to all interfaces. Once it hits zero the device reverts back to normal |
| 4098 | * filtering operation. A negative @inc value is used to drop the counter |
| 4099 | * when releasing a resource needing all multicasts. |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4100 | * Return 0 if successful or a negative errno code on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4101 | */ |
| 4102 | |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4103 | int dev_set_allmulti(struct net_device *dev, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4104 | { |
| 4105 | unsigned short old_flags = dev->flags; |
| 4106 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4107 | ASSERT_RTNL(); |
| 4108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4109 | dev->flags |= IFF_ALLMULTI; |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4110 | dev->allmulti += inc; |
| 4111 | if (dev->allmulti == 0) { |
| 4112 | /* |
| 4113 | * Avoid overflow. |
| 4114 | * If inc causes overflow, untouch allmulti and return error. |
| 4115 | */ |
| 4116 | if (inc < 0) |
| 4117 | dev->flags &= ~IFF_ALLMULTI; |
| 4118 | else { |
| 4119 | dev->allmulti -= inc; |
| 4120 | printk(KERN_WARNING "%s: allmulti touches roof, " |
| 4121 | "set allmulti failed, allmulti feature of " |
| 4122 | "device might be broken.\n", dev->name); |
| 4123 | return -EOVERFLOW; |
| 4124 | } |
| 4125 | } |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4126 | if (dev->flags ^ old_flags) { |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4127 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4128 | dev_set_rx_mode(dev); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4129 | } |
Wang Chen | dad9b33 | 2008-06-18 01:48:28 -0700 | [diff] [blame] | 4130 | return 0; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4131 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4132 | EXPORT_SYMBOL(dev_set_allmulti); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4133 | |
| 4134 | /* |
| 4135 | * Upload unicast and multicast address lists to device and |
| 4136 | * configure RX filtering. When the device doesn't support unicast |
Joe Perches | 53ccaae | 2007-12-20 14:02:06 -0800 | [diff] [blame] | 4137 | * filtering it is put in promiscuous mode while unicast addresses |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4138 | * are present. |
| 4139 | */ |
| 4140 | void __dev_set_rx_mode(struct net_device *dev) |
| 4141 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4142 | const struct net_device_ops *ops = dev->netdev_ops; |
| 4143 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4144 | /* dev_open will call this function so the list will stay sane. */ |
| 4145 | if (!(dev->flags&IFF_UP)) |
| 4146 | return; |
| 4147 | |
| 4148 | if (!netif_device_present(dev)) |
YOSHIFUJI Hideaki | 40b77c9 | 2007-07-19 10:43:23 +0900 | [diff] [blame] | 4149 | return; |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4150 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4151 | if (ops->ndo_set_rx_mode) |
| 4152 | ops->ndo_set_rx_mode(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4153 | else { |
| 4154 | /* Unicast addresses changes may only happen under the rtnl, |
| 4155 | * therefore calling __dev_set_promiscuity here is safe. |
| 4156 | */ |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4157 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4158 | __dev_set_promiscuity(dev, 1); |
| 4159 | dev->uc_promisc = 1; |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 4160 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4161 | __dev_set_promiscuity(dev, -1); |
| 4162 | dev->uc_promisc = 0; |
| 4163 | } |
| 4164 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4165 | if (ops->ndo_set_multicast_list) |
| 4166 | ops->ndo_set_multicast_list(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4167 | } |
| 4168 | } |
| 4169 | |
| 4170 | void dev_set_rx_mode(struct net_device *dev) |
| 4171 | { |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4172 | netif_addr_lock_bh(dev); |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4173 | __dev_set_rx_mode(dev); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 4174 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4175 | } |
| 4176 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4177 | /** |
| 4178 | * dev_get_flags - get flags reported to userspace |
| 4179 | * @dev: device |
| 4180 | * |
| 4181 | * Get the combination of flag bits exported through APIs to userspace. |
| 4182 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4183 | unsigned dev_get_flags(const struct net_device *dev) |
| 4184 | { |
| 4185 | unsigned flags; |
| 4186 | |
| 4187 | flags = (dev->flags & ~(IFF_PROMISC | |
| 4188 | IFF_ALLMULTI | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4189 | IFF_RUNNING | |
| 4190 | IFF_LOWER_UP | |
| 4191 | IFF_DORMANT)) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4192 | (dev->gflags & (IFF_PROMISC | |
| 4193 | IFF_ALLMULTI)); |
| 4194 | |
Stefan Rompf | b00055a | 2006-03-20 17:09:11 -0800 | [diff] [blame] | 4195 | if (netif_running(dev)) { |
| 4196 | if (netif_oper_up(dev)) |
| 4197 | flags |= IFF_RUNNING; |
| 4198 | if (netif_carrier_ok(dev)) |
| 4199 | flags |= IFF_LOWER_UP; |
| 4200 | if (netif_dormant(dev)) |
| 4201 | flags |= IFF_DORMANT; |
| 4202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4203 | |
| 4204 | return flags; |
| 4205 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4206 | EXPORT_SYMBOL(dev_get_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4207 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4208 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4209 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4210 | int old_flags = dev->flags; |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4211 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4212 | |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4213 | ASSERT_RTNL(); |
| 4214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4215 | /* |
| 4216 | * Set the flags on our device. |
| 4217 | */ |
| 4218 | |
| 4219 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | |
| 4220 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | |
| 4221 | IFF_AUTOMEDIA)) | |
| 4222 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | |
| 4223 | IFF_ALLMULTI)); |
| 4224 | |
| 4225 | /* |
| 4226 | * Load in the correct multicast list now the flags have changed. |
| 4227 | */ |
| 4228 | |
Patrick McHardy | b6c40d6 | 2008-10-07 15:26:48 -0700 | [diff] [blame] | 4229 | if ((old_flags ^ flags) & IFF_MULTICAST) |
| 4230 | dev_change_rx_flags(dev, IFF_MULTICAST); |
Patrick McHardy | 2402345 | 2007-07-14 18:51:31 -0700 | [diff] [blame] | 4231 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4232 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4233 | |
| 4234 | /* |
| 4235 | * Have we downed the interface. We handle IFF_UP ourselves |
| 4236 | * according to user attempts to set it, rather than blindly |
| 4237 | * setting it. |
| 4238 | */ |
| 4239 | |
| 4240 | ret = 0; |
| 4241 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4242 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4243 | |
| 4244 | if (!ret) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 4245 | dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4246 | } |
| 4247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4248 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4249 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
| 4250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4251 | dev->gflags ^= IFF_PROMISC; |
| 4252 | dev_set_promiscuity(dev, inc); |
| 4253 | } |
| 4254 | |
| 4255 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI |
| 4256 | is important. Some (broken) drivers set IFF_PROMISC, when |
| 4257 | IFF_ALLMULTI is requested not asking us and not reporting. |
| 4258 | */ |
| 4259 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4260 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
| 4261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4262 | dev->gflags ^= IFF_ALLMULTI; |
| 4263 | dev_set_allmulti(dev, inc); |
| 4264 | } |
| 4265 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4266 | return ret; |
| 4267 | } |
| 4268 | |
| 4269 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags) |
| 4270 | { |
| 4271 | unsigned int changes = dev->flags ^ old_flags; |
| 4272 | |
| 4273 | if (changes & IFF_UP) { |
| 4274 | if (dev->flags & IFF_UP) |
| 4275 | call_netdevice_notifiers(NETDEV_UP, dev); |
| 4276 | else |
| 4277 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
| 4278 | } |
| 4279 | |
| 4280 | if (dev->flags & IFF_UP && |
| 4281 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) |
| 4282 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
| 4283 | } |
| 4284 | |
| 4285 | /** |
| 4286 | * dev_change_flags - change device settings |
| 4287 | * @dev: device |
| 4288 | * @flags: device state flags |
| 4289 | * |
| 4290 | * Change settings on device based state flags. The flags are |
| 4291 | * in the userspace exported format. |
| 4292 | */ |
| 4293 | int dev_change_flags(struct net_device *dev, unsigned flags) |
| 4294 | { |
| 4295 | int ret, changes; |
| 4296 | int old_flags = dev->flags; |
| 4297 | |
| 4298 | ret = __dev_change_flags(dev, flags); |
| 4299 | if (ret < 0) |
| 4300 | return ret; |
| 4301 | |
| 4302 | changes = old_flags ^ dev->flags; |
Thomas Graf | 7c355f5 | 2007-06-05 16:03:03 -0700 | [diff] [blame] | 4303 | if (changes) |
| 4304 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4305 | |
Patrick McHardy | bd38081 | 2010-02-26 06:34:53 +0000 | [diff] [blame] | 4306 | __dev_notify_flags(dev, old_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4307 | return ret; |
| 4308 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4309 | EXPORT_SYMBOL(dev_change_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4310 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4311 | /** |
| 4312 | * dev_set_mtu - Change maximum transfer unit |
| 4313 | * @dev: device |
| 4314 | * @new_mtu: new transfer unit |
| 4315 | * |
| 4316 | * Change the maximum transfer size of the network device. |
| 4317 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4318 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
| 4319 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4320 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4321 | int err; |
| 4322 | |
| 4323 | if (new_mtu == dev->mtu) |
| 4324 | return 0; |
| 4325 | |
| 4326 | /* MTU must be positive. */ |
| 4327 | if (new_mtu < 0) |
| 4328 | return -EINVAL; |
| 4329 | |
| 4330 | if (!netif_device_present(dev)) |
| 4331 | return -ENODEV; |
| 4332 | |
| 4333 | err = 0; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4334 | if (ops->ndo_change_mtu) |
| 4335 | err = ops->ndo_change_mtu(dev, new_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4336 | else |
| 4337 | dev->mtu = new_mtu; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4339 | if (!err && dev->flags & IFF_UP) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4340 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4341 | return err; |
| 4342 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4343 | EXPORT_SYMBOL(dev_set_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4344 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 4345 | /** |
| 4346 | * dev_set_mac_address - Change Media Access Control Address |
| 4347 | * @dev: device |
| 4348 | * @sa: new address |
| 4349 | * |
| 4350 | * Change the hardware (MAC) address of the device |
| 4351 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4352 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
| 4353 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4354 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4355 | int err; |
| 4356 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4357 | if (!ops->ndo_set_mac_address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4358 | return -EOPNOTSUPP; |
| 4359 | if (sa->sa_family != dev->type) |
| 4360 | return -EINVAL; |
| 4361 | if (!netif_device_present(dev)) |
| 4362 | return -ENODEV; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4363 | err = ops->ndo_set_mac_address(dev, sa); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4364 | if (!err) |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 4365 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4366 | return err; |
| 4367 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4368 | EXPORT_SYMBOL(dev_set_mac_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4369 | |
| 4370 | /* |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4371 | * Perform the SIOCxIFxxx calls, inside rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4372 | */ |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4373 | 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] | 4374 | { |
| 4375 | int err; |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4376 | 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] | 4377 | |
| 4378 | if (!dev) |
| 4379 | return -ENODEV; |
| 4380 | |
| 4381 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4382 | case SIOCGIFFLAGS: /* Get interface flags */ |
| 4383 | ifr->ifr_flags = (short) dev_get_flags(dev); |
| 4384 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4385 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4386 | case SIOCGIFMETRIC: /* Get the metric on the interface |
| 4387 | (currently unused) */ |
| 4388 | ifr->ifr_metric = 0; |
| 4389 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4390 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4391 | case SIOCGIFMTU: /* Get the MTU of a device */ |
| 4392 | ifr->ifr_mtu = dev->mtu; |
| 4393 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4394 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4395 | case SIOCGIFHWADDR: |
| 4396 | if (!dev->addr_len) |
| 4397 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); |
| 4398 | else |
| 4399 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, |
| 4400 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4401 | ifr->ifr_hwaddr.sa_family = dev->type; |
| 4402 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4403 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4404 | case SIOCGIFSLAVE: |
| 4405 | err = -EINVAL; |
| 4406 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4407 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4408 | case SIOCGIFMAP: |
| 4409 | ifr->ifr_map.mem_start = dev->mem_start; |
| 4410 | ifr->ifr_map.mem_end = dev->mem_end; |
| 4411 | ifr->ifr_map.base_addr = dev->base_addr; |
| 4412 | ifr->ifr_map.irq = dev->irq; |
| 4413 | ifr->ifr_map.dma = dev->dma; |
| 4414 | ifr->ifr_map.port = dev->if_port; |
| 4415 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4416 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4417 | case SIOCGIFINDEX: |
| 4418 | ifr->ifr_ifindex = dev->ifindex; |
| 4419 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4420 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4421 | case SIOCGIFTXQLEN: |
| 4422 | ifr->ifr_qlen = dev->tx_queue_len; |
| 4423 | return 0; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4424 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4425 | default: |
| 4426 | /* dev_ioctl() should ensure this case |
| 4427 | * is never reached |
| 4428 | */ |
| 4429 | WARN_ON(1); |
| 4430 | err = -EINVAL; |
| 4431 | break; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4432 | |
| 4433 | } |
| 4434 | return err; |
| 4435 | } |
| 4436 | |
| 4437 | /* |
| 4438 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() |
| 4439 | */ |
| 4440 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) |
| 4441 | { |
| 4442 | int err; |
| 4443 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4444 | const struct net_device_ops *ops; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4445 | |
| 4446 | if (!dev) |
| 4447 | return -ENODEV; |
| 4448 | |
Jarek Poplawski | 5f2f6da | 2008-12-22 19:35:28 -0800 | [diff] [blame] | 4449 | ops = dev->netdev_ops; |
| 4450 | |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4451 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4452 | case SIOCSIFFLAGS: /* Set interface flags */ |
| 4453 | return dev_change_flags(dev, ifr->ifr_flags); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4454 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4455 | case SIOCSIFMETRIC: /* Set the metric on the interface |
| 4456 | (currently unused) */ |
| 4457 | return -EOPNOTSUPP; |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4458 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4459 | case SIOCSIFMTU: /* Set the MTU of a device */ |
| 4460 | return dev_set_mtu(dev, ifr->ifr_mtu); |
Jeff Garzik | 14e3e07 | 2007-10-08 00:06:32 -0700 | [diff] [blame] | 4461 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4462 | case SIOCSIFHWADDR: |
| 4463 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4464 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4465 | case SIOCSIFHWBROADCAST: |
| 4466 | if (ifr->ifr_hwaddr.sa_family != dev->type) |
| 4467 | return -EINVAL; |
| 4468 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, |
| 4469 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); |
| 4470 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 4471 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4472 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4473 | case SIOCSIFMAP: |
| 4474 | if (ops->ndo_set_config) { |
| 4475 | if (!netif_device_present(dev)) |
| 4476 | return -ENODEV; |
| 4477 | return ops->ndo_set_config(dev, &ifr->ifr_map); |
| 4478 | } |
| 4479 | return -EOPNOTSUPP; |
| 4480 | |
| 4481 | case SIOCADDMULTI: |
| 4482 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || |
| 4483 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 4484 | return -EINVAL; |
| 4485 | if (!netif_device_present(dev)) |
| 4486 | return -ENODEV; |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 4487 | return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4488 | |
| 4489 | case SIOCDELMULTI: |
| 4490 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || |
| 4491 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
| 4492 | return -EINVAL; |
| 4493 | if (!netif_device_present(dev)) |
| 4494 | return -ENODEV; |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 4495 | return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4496 | |
| 4497 | case SIOCSIFTXQLEN: |
| 4498 | if (ifr->ifr_qlen < 0) |
| 4499 | return -EINVAL; |
| 4500 | dev->tx_queue_len = ifr->ifr_qlen; |
| 4501 | return 0; |
| 4502 | |
| 4503 | case SIOCSIFNAME: |
| 4504 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; |
| 4505 | return dev_change_name(dev, ifr->ifr_newname); |
| 4506 | |
| 4507 | /* |
| 4508 | * Unknown or private ioctl |
| 4509 | */ |
| 4510 | default: |
| 4511 | if ((cmd >= SIOCDEVPRIVATE && |
| 4512 | cmd <= SIOCDEVPRIVATE + 15) || |
| 4513 | cmd == SIOCBONDENSLAVE || |
| 4514 | cmd == SIOCBONDRELEASE || |
| 4515 | cmd == SIOCBONDSETHWADDR || |
| 4516 | cmd == SIOCBONDSLAVEINFOQUERY || |
| 4517 | cmd == SIOCBONDINFOQUERY || |
| 4518 | cmd == SIOCBONDCHANGEACTIVE || |
| 4519 | cmd == SIOCGMIIPHY || |
| 4520 | cmd == SIOCGMIIREG || |
| 4521 | cmd == SIOCSMIIREG || |
| 4522 | cmd == SIOCBRADDIF || |
| 4523 | cmd == SIOCBRDELIF || |
| 4524 | cmd == SIOCSHWTSTAMP || |
| 4525 | cmd == SIOCWANDEV) { |
| 4526 | err = -EOPNOTSUPP; |
| 4527 | if (ops->ndo_do_ioctl) { |
| 4528 | if (netif_device_present(dev)) |
| 4529 | err = ops->ndo_do_ioctl(dev, ifr, cmd); |
| 4530 | else |
| 4531 | err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4532 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4533 | } else |
| 4534 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4535 | |
| 4536 | } |
| 4537 | return err; |
| 4538 | } |
| 4539 | |
| 4540 | /* |
| 4541 | * This function handles all "interface"-type I/O control requests. The actual |
| 4542 | * 'doing' part of this is dev_ifsioc above. |
| 4543 | */ |
| 4544 | |
| 4545 | /** |
| 4546 | * dev_ioctl - network device ioctl |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 4547 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4548 | * @cmd: command to issue |
| 4549 | * @arg: pointer to a struct ifreq in user space |
| 4550 | * |
| 4551 | * Issue ioctl functions to devices. This is normally called by the |
| 4552 | * user space syscall interfaces but can sometimes be useful for |
| 4553 | * other purposes. The return value is the return from the syscall if |
| 4554 | * positive or a negative errno code on error. |
| 4555 | */ |
| 4556 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4557 | int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4558 | { |
| 4559 | struct ifreq ifr; |
| 4560 | int ret; |
| 4561 | char *colon; |
| 4562 | |
| 4563 | /* One special case: SIOCGIFCONF takes ifconf argument |
| 4564 | and requires shared lock, because it sleeps writing |
| 4565 | to user space. |
| 4566 | */ |
| 4567 | |
| 4568 | if (cmd == SIOCGIFCONF) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 4569 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4570 | ret = dev_ifconf(net, (char __user *) arg); |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 4571 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4572 | return ret; |
| 4573 | } |
| 4574 | if (cmd == SIOCGIFNAME) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4575 | return dev_ifname(net, (struct ifreq __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4576 | |
| 4577 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| 4578 | return -EFAULT; |
| 4579 | |
| 4580 | ifr.ifr_name[IFNAMSIZ-1] = 0; |
| 4581 | |
| 4582 | colon = strchr(ifr.ifr_name, ':'); |
| 4583 | if (colon) |
| 4584 | *colon = 0; |
| 4585 | |
| 4586 | /* |
| 4587 | * See which interface the caller is talking about. |
| 4588 | */ |
| 4589 | |
| 4590 | switch (cmd) { |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4591 | /* |
| 4592 | * These ioctl calls: |
| 4593 | * - can be done by all. |
| 4594 | * - atomic and do not require locking. |
| 4595 | * - return a value |
| 4596 | */ |
| 4597 | case SIOCGIFFLAGS: |
| 4598 | case SIOCGIFMETRIC: |
| 4599 | case SIOCGIFMTU: |
| 4600 | case SIOCGIFHWADDR: |
| 4601 | case SIOCGIFSLAVE: |
| 4602 | case SIOCGIFMAP: |
| 4603 | case SIOCGIFINDEX: |
| 4604 | case SIOCGIFTXQLEN: |
| 4605 | dev_load(net, ifr.ifr_name); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4606 | rcu_read_lock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4607 | ret = dev_ifsioc_locked(net, &ifr, cmd); |
Eric Dumazet | 3710bec | 2009-11-01 19:42:09 +0000 | [diff] [blame] | 4608 | rcu_read_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4609 | if (!ret) { |
| 4610 | if (colon) |
| 4611 | *colon = ':'; |
| 4612 | if (copy_to_user(arg, &ifr, |
| 4613 | sizeof(struct ifreq))) |
| 4614 | ret = -EFAULT; |
| 4615 | } |
| 4616 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4617 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4618 | case SIOCETHTOOL: |
| 4619 | dev_load(net, ifr.ifr_name); |
| 4620 | rtnl_lock(); |
| 4621 | ret = dev_ethtool(net, &ifr); |
| 4622 | rtnl_unlock(); |
| 4623 | if (!ret) { |
| 4624 | if (colon) |
| 4625 | *colon = ':'; |
| 4626 | if (copy_to_user(arg, &ifr, |
| 4627 | sizeof(struct ifreq))) |
| 4628 | ret = -EFAULT; |
| 4629 | } |
| 4630 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4631 | |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4632 | /* |
| 4633 | * These ioctl calls: |
| 4634 | * - require superuser power. |
| 4635 | * - require strict serialization. |
| 4636 | * - return a value |
| 4637 | */ |
| 4638 | case SIOCGMIIPHY: |
| 4639 | case SIOCGMIIREG: |
| 4640 | case SIOCSIFNAME: |
| 4641 | if (!capable(CAP_NET_ADMIN)) |
| 4642 | return -EPERM; |
| 4643 | dev_load(net, ifr.ifr_name); |
| 4644 | rtnl_lock(); |
| 4645 | ret = dev_ifsioc(net, &ifr, cmd); |
| 4646 | rtnl_unlock(); |
| 4647 | if (!ret) { |
| 4648 | if (colon) |
| 4649 | *colon = ':'; |
| 4650 | if (copy_to_user(arg, &ifr, |
| 4651 | sizeof(struct ifreq))) |
| 4652 | ret = -EFAULT; |
| 4653 | } |
| 4654 | return ret; |
| 4655 | |
| 4656 | /* |
| 4657 | * These ioctl calls: |
| 4658 | * - require superuser power. |
| 4659 | * - require strict serialization. |
| 4660 | * - do not return a value |
| 4661 | */ |
| 4662 | case SIOCSIFFLAGS: |
| 4663 | case SIOCSIFMETRIC: |
| 4664 | case SIOCSIFMTU: |
| 4665 | case SIOCSIFMAP: |
| 4666 | case SIOCSIFHWADDR: |
| 4667 | case SIOCSIFSLAVE: |
| 4668 | case SIOCADDMULTI: |
| 4669 | case SIOCDELMULTI: |
| 4670 | case SIOCSIFHWBROADCAST: |
| 4671 | case SIOCSIFTXQLEN: |
| 4672 | case SIOCSMIIREG: |
| 4673 | case SIOCBONDENSLAVE: |
| 4674 | case SIOCBONDRELEASE: |
| 4675 | case SIOCBONDSETHWADDR: |
| 4676 | case SIOCBONDCHANGEACTIVE: |
| 4677 | case SIOCBRADDIF: |
| 4678 | case SIOCBRDELIF: |
| 4679 | case SIOCSHWTSTAMP: |
| 4680 | if (!capable(CAP_NET_ADMIN)) |
| 4681 | return -EPERM; |
| 4682 | /* fall through */ |
| 4683 | case SIOCBONDSLAVEINFOQUERY: |
| 4684 | case SIOCBONDINFOQUERY: |
| 4685 | dev_load(net, ifr.ifr_name); |
| 4686 | rtnl_lock(); |
| 4687 | ret = dev_ifsioc(net, &ifr, cmd); |
| 4688 | rtnl_unlock(); |
| 4689 | return ret; |
| 4690 | |
| 4691 | case SIOCGIFMEM: |
| 4692 | /* Get the per device memory space. We can add this but |
| 4693 | * currently do not support it */ |
| 4694 | case SIOCSIFMEM: |
| 4695 | /* Set the per device memory buffer space. |
| 4696 | * Not applicable in our case */ |
| 4697 | case SIOCSIFLINK: |
| 4698 | return -EINVAL; |
| 4699 | |
| 4700 | /* |
| 4701 | * Unknown or private ioctl. |
| 4702 | */ |
| 4703 | default: |
| 4704 | if (cmd == SIOCWANDEV || |
| 4705 | (cmd >= SIOCDEVPRIVATE && |
| 4706 | cmd <= SIOCDEVPRIVATE + 15)) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4707 | dev_load(net, ifr.ifr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4708 | rtnl_lock(); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4709 | ret = dev_ifsioc(net, &ifr, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4710 | rtnl_unlock(); |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4711 | if (!ret && copy_to_user(arg, &ifr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4712 | sizeof(struct ifreq))) |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4713 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4714 | return ret; |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 4715 | } |
| 4716 | /* Take care of Wireless Extensions */ |
| 4717 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) |
| 4718 | return wext_handle_ioctl(net, &ifr, cmd, arg); |
| 4719 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4720 | } |
| 4721 | } |
| 4722 | |
| 4723 | |
| 4724 | /** |
| 4725 | * dev_new_index - allocate an ifindex |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 4726 | * @net: the applicable net namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4727 | * |
| 4728 | * Returns a suitable unique value for a new device interface |
| 4729 | * number. The caller must hold the rtnl semaphore or the |
| 4730 | * dev_base_lock to be sure it remains unique. |
| 4731 | */ |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4732 | static int dev_new_index(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4733 | { |
| 4734 | static int ifindex; |
| 4735 | for (;;) { |
| 4736 | if (++ifindex <= 0) |
| 4737 | ifindex = 1; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4738 | if (!__dev_get_by_index(net, ifindex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4739 | return ifindex; |
| 4740 | } |
| 4741 | } |
| 4742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4743 | /* Delayed registration/unregisteration */ |
Denis Cheng | 3b5b34f | 2007-12-07 00:49:17 -0800 | [diff] [blame] | 4744 | static LIST_HEAD(net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4745 | |
Stephen Hemminger | 6f05f62 | 2007-03-08 20:46:03 -0800 | [diff] [blame] | 4746 | static void net_set_todo(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4747 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4748 | list_add_tail(&dev->todo_list, &net_todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4749 | } |
| 4750 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4751 | static void rollback_registered_many(struct list_head *head) |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4752 | { |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4753 | struct net_device *dev, *tmp; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4754 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4755 | BUG_ON(dev_boot_phase); |
| 4756 | ASSERT_RTNL(); |
| 4757 | |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4758 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4759 | /* Some devices call without registering |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4760 | * for initialization unwind. Remove those |
| 4761 | * devices and proceed with the remaining. |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4762 | */ |
| 4763 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 4764 | pr_debug("unregister_netdevice: device %s/%p never " |
| 4765 | "was registered\n", dev->name, dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4766 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4767 | WARN_ON(1); |
Krishna Kumar | e93737b | 2009-12-08 22:26:02 +0000 | [diff] [blame] | 4768 | list_del(&dev->unreg_list); |
| 4769 | continue; |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4770 | } |
| 4771 | |
| 4772 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
| 4773 | |
| 4774 | /* If device is running, close it first. */ |
| 4775 | dev_close(dev); |
| 4776 | |
| 4777 | /* And unlink it from device chain. */ |
| 4778 | unlist_netdevice(dev); |
| 4779 | |
| 4780 | dev->reg_state = NETREG_UNREGISTERING; |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4781 | } |
| 4782 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4783 | synchronize_net(); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4784 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4785 | list_for_each_entry(dev, head, unreg_list) { |
| 4786 | /* Shutdown queueing discipline. */ |
| 4787 | dev_shutdown(dev); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4788 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4789 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4790 | /* Notify protocols, that we are about to destroy |
| 4791 | this device. They should clean all the things. |
| 4792 | */ |
| 4793 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
| 4794 | |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 4795 | if (!dev->rtnl_link_ops || |
| 4796 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 4797 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); |
| 4798 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4799 | /* |
| 4800 | * Flush the unicast and multicast chains |
| 4801 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 4802 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 4803 | dev_mc_flush(dev); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4804 | |
| 4805 | if (dev->netdev_ops->ndo_uninit) |
| 4806 | dev->netdev_ops->ndo_uninit(dev); |
| 4807 | |
| 4808 | /* Notifier chain MUST detach us from master device. */ |
| 4809 | WARN_ON(dev->master); |
| 4810 | |
| 4811 | /* Remove entries from kobject tree */ |
| 4812 | netdev_unregister_kobject(dev); |
| 4813 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4814 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 4815 | /* Process any work delayed until the end of the batch */ |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 4816 | dev = list_first_entry(head, struct net_device, unreg_list); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 4817 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
| 4818 | |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4819 | synchronize_net(); |
| 4820 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 4821 | list_for_each_entry(dev, head, unreg_list) |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4822 | dev_put(dev); |
| 4823 | } |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4824 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4825 | static void rollback_registered(struct net_device *dev) |
| 4826 | { |
| 4827 | LIST_HEAD(single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4828 | |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 4829 | list_add(&dev->unreg_list, &single); |
| 4830 | rollback_registered_many(&single); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 4831 | } |
| 4832 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 4833 | static void __netdev_init_queue_locks_one(struct net_device *dev, |
| 4834 | struct netdev_queue *dev_queue, |
| 4835 | void *_unused) |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4836 | { |
| 4837 | spin_lock_init(&dev_queue->_xmit_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 4838 | netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4839 | dev_queue->xmit_lock_owner = -1; |
| 4840 | } |
| 4841 | |
| 4842 | static void netdev_init_queue_locks(struct net_device *dev) |
| 4843 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 4844 | netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL); |
| 4845 | __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4846 | } |
| 4847 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 4848 | unsigned long netdev_fix_features(unsigned long features, const char *name) |
| 4849 | { |
| 4850 | /* Fix illegal SG+CSUM combinations. */ |
| 4851 | if ((features & NETIF_F_SG) && |
| 4852 | !(features & NETIF_F_ALL_CSUM)) { |
| 4853 | if (name) |
| 4854 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no " |
| 4855 | "checksum feature.\n", name); |
| 4856 | features &= ~NETIF_F_SG; |
| 4857 | } |
| 4858 | |
| 4859 | /* TSO requires that SG is present as well. */ |
| 4860 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) { |
| 4861 | if (name) |
| 4862 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no " |
| 4863 | "SG feature.\n", name); |
| 4864 | features &= ~NETIF_F_TSO; |
| 4865 | } |
| 4866 | |
| 4867 | if (features & NETIF_F_UFO) { |
| 4868 | if (!(features & NETIF_F_GEN_CSUM)) { |
| 4869 | if (name) |
| 4870 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " |
| 4871 | "since no NETIF_F_HW_CSUM feature.\n", |
| 4872 | name); |
| 4873 | features &= ~NETIF_F_UFO; |
| 4874 | } |
| 4875 | |
| 4876 | if (!(features & NETIF_F_SG)) { |
| 4877 | if (name) |
| 4878 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " |
| 4879 | "since no NETIF_F_SG feature.\n", name); |
| 4880 | features &= ~NETIF_F_UFO; |
| 4881 | } |
| 4882 | } |
| 4883 | |
| 4884 | return features; |
| 4885 | } |
| 4886 | EXPORT_SYMBOL(netdev_fix_features); |
| 4887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4888 | /** |
Patrick Mullaney | fc4a748 | 2009-12-03 15:59:22 -0800 | [diff] [blame] | 4889 | * netif_stacked_transfer_operstate - transfer operstate |
| 4890 | * @rootdev: the root or lower level device to transfer state from |
| 4891 | * @dev: the device to transfer operstate to |
| 4892 | * |
| 4893 | * Transfer operational state from root to device. This is normally |
| 4894 | * called when a stacking relationship exists between the root |
| 4895 | * device and the device(a leaf device). |
| 4896 | */ |
| 4897 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, |
| 4898 | struct net_device *dev) |
| 4899 | { |
| 4900 | if (rootdev->operstate == IF_OPER_DORMANT) |
| 4901 | netif_dormant_on(dev); |
| 4902 | else |
| 4903 | netif_dormant_off(dev); |
| 4904 | |
| 4905 | if (netif_carrier_ok(rootdev)) { |
| 4906 | if (!netif_carrier_ok(dev)) |
| 4907 | netif_carrier_on(dev); |
| 4908 | } else { |
| 4909 | if (netif_carrier_ok(dev)) |
| 4910 | netif_carrier_off(dev); |
| 4911 | } |
| 4912 | } |
| 4913 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); |
| 4914 | |
| 4915 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4916 | * register_netdevice - register a network device |
| 4917 | * @dev: device to register |
| 4918 | * |
| 4919 | * Take a completed network device structure and add it to the kernel |
| 4920 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 4921 | * chain. 0 is returned on success. A negative errno code is returned |
| 4922 | * on a failure to set up the device, or if the name is a duplicate. |
| 4923 | * |
| 4924 | * Callers must hold the rtnl semaphore. You may want |
| 4925 | * register_netdev() instead of this. |
| 4926 | * |
| 4927 | * BUGS: |
| 4928 | * The locking appears insufficient to guarantee two parallel registers |
| 4929 | * will not get the same name. |
| 4930 | */ |
| 4931 | |
| 4932 | int register_netdevice(struct net_device *dev) |
| 4933 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4934 | int ret; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4935 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4936 | |
| 4937 | BUG_ON(dev_boot_phase); |
| 4938 | ASSERT_RTNL(); |
| 4939 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 4940 | might_sleep(); |
| 4941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4942 | /* When net_device's are persistent, this will be fatal. */ |
| 4943 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4944 | BUG_ON(!net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4945 | |
David S. Miller | f1f28aa | 2008-07-15 00:08:33 -0700 | [diff] [blame] | 4946 | spin_lock_init(&dev->addr_list_lock); |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 4947 | netdev_set_addr_lockdep_class(dev); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 4948 | netdev_init_queue_locks(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4950 | dev->iflink = -1; |
| 4951 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 4952 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 4953 | if (!dev->num_rx_queues) { |
| 4954 | /* |
| 4955 | * Allocate a single RX queue if driver never called |
| 4956 | * alloc_netdev_mq |
| 4957 | */ |
| 4958 | |
| 4959 | dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL); |
| 4960 | if (!dev->_rx) { |
| 4961 | ret = -ENOMEM; |
| 4962 | goto out; |
| 4963 | } |
| 4964 | |
| 4965 | dev->_rx->first = dev->_rx; |
| 4966 | atomic_set(&dev->_rx->count, 1); |
| 4967 | dev->num_rx_queues = 1; |
| 4968 | } |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 4969 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4970 | /* Init, if this function is available */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 4971 | if (dev->netdev_ops->ndo_init) { |
| 4972 | ret = dev->netdev_ops->ndo_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4973 | if (ret) { |
| 4974 | if (ret > 0) |
| 4975 | ret = -EIO; |
Adrian Bunk | 90833aa | 2006-11-13 16:02:22 -0800 | [diff] [blame] | 4976 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4977 | } |
| 4978 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 4979 | |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 4980 | ret = dev_get_valid_name(dev, dev->name, 0); |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 4981 | if (ret) |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 4982 | goto err_uninit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4983 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 4984 | dev->ifindex = dev_new_index(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4985 | if (dev->iflink == -1) |
| 4986 | dev->iflink = dev->ifindex; |
| 4987 | |
Stephen Hemminger | d212f87 | 2007-06-27 00:47:37 -0700 | [diff] [blame] | 4988 | /* Fix illegal checksum combinations */ |
| 4989 | if ((dev->features & NETIF_F_HW_CSUM) && |
| 4990 | (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
| 4991 | printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", |
| 4992 | dev->name); |
| 4993 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
| 4994 | } |
| 4995 | |
| 4996 | if ((dev->features & NETIF_F_NO_CSUM) && |
| 4997 | (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
| 4998 | printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", |
| 4999 | dev->name); |
| 5000 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); |
| 5001 | } |
| 5002 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5003 | dev->features = netdev_fix_features(dev->features, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5004 | |
Lennert Buytenhek | e5a4a72 | 2008-08-03 01:23:10 -0700 | [diff] [blame] | 5005 | /* Enable software GSO if SG is supported. */ |
| 5006 | if (dev->features & NETIF_F_SG) |
| 5007 | dev->features |= NETIF_F_GSO; |
| 5008 | |
Johannes Berg | 7ffbe3f | 2009-10-02 05:15:27 +0000 | [diff] [blame] | 5009 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
| 5010 | ret = notifier_to_errno(ret); |
| 5011 | if (ret) |
| 5012 | goto err_uninit; |
| 5013 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5014 | ret = netdev_register_kobject(dev); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5015 | if (ret) |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5016 | goto err_uninit; |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5017 | dev->reg_state = NETREG_REGISTERED; |
| 5018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5019 | /* |
| 5020 | * Default initial state at registry is that the |
| 5021 | * device is present. |
| 5022 | */ |
| 5023 | |
| 5024 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5026 | dev_init_scheduler(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5027 | dev_hold(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5028 | list_netdevice(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5029 | |
| 5030 | /* Notify protocols, that a new device appeared. */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5031 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
Herbert Xu | fcc5a03 | 2007-07-30 17:03:38 -0700 | [diff] [blame] | 5032 | ret = notifier_to_errno(ret); |
Daniel Lezcano | 93ee31f | 2007-10-30 15:38:18 -0700 | [diff] [blame] | 5033 | if (ret) { |
| 5034 | rollback_registered(dev); |
| 5035 | dev->reg_state = NETREG_UNREGISTERED; |
| 5036 | } |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 5037 | /* |
| 5038 | * Prevent userspace races by waiting until the network |
| 5039 | * device is fully setup before sending notifications. |
| 5040 | */ |
Patrick McHardy | a283576 | 2010-02-26 06:34:51 +0000 | [diff] [blame] | 5041 | if (!dev->rtnl_link_ops || |
| 5042 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
| 5043 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5044 | |
| 5045 | out: |
| 5046 | return ret; |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5047 | |
| 5048 | err_uninit: |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 5049 | if (dev->netdev_ops->ndo_uninit) |
| 5050 | dev->netdev_ops->ndo_uninit(dev); |
Herbert Xu | 7ce1b0e | 2007-07-30 16:29:40 -0700 | [diff] [blame] | 5051 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5052 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5053 | EXPORT_SYMBOL(register_netdevice); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5054 | |
| 5055 | /** |
Benjamin Herrenschmidt | 937f1ba | 2009-01-14 21:05:05 -0800 | [diff] [blame] | 5056 | * init_dummy_netdev - init a dummy network device for NAPI |
| 5057 | * @dev: device to init |
| 5058 | * |
| 5059 | * This takes a network device structure and initialize the minimum |
| 5060 | * amount of fields so it can be used to schedule NAPI polls without |
| 5061 | * registering a full blown interface. This is to be used by drivers |
| 5062 | * that need to tie several hardware interfaces to a single NAPI |
| 5063 | * poll scheduler due to HW limitations. |
| 5064 | */ |
| 5065 | int init_dummy_netdev(struct net_device *dev) |
| 5066 | { |
| 5067 | /* Clear everything. Note we don't initialize spinlocks |
| 5068 | * are they aren't supposed to be taken by any of the |
| 5069 | * NAPI code and this dummy netdev is supposed to be |
| 5070 | * only ever used for NAPI polls |
| 5071 | */ |
| 5072 | memset(dev, 0, sizeof(struct net_device)); |
| 5073 | |
| 5074 | /* make sure we BUG if trying to hit standard |
| 5075 | * register/unregister code path |
| 5076 | */ |
| 5077 | dev->reg_state = NETREG_DUMMY; |
| 5078 | |
| 5079 | /* initialize the ref count */ |
| 5080 | atomic_set(&dev->refcnt, 1); |
| 5081 | |
| 5082 | /* NAPI wants this */ |
| 5083 | INIT_LIST_HEAD(&dev->napi_list); |
| 5084 | |
| 5085 | /* a dummy interface is started by default */ |
| 5086 | set_bit(__LINK_STATE_PRESENT, &dev->state); |
| 5087 | set_bit(__LINK_STATE_START, &dev->state); |
| 5088 | |
| 5089 | return 0; |
| 5090 | } |
| 5091 | EXPORT_SYMBOL_GPL(init_dummy_netdev); |
| 5092 | |
| 5093 | |
| 5094 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5095 | * register_netdev - register a network device |
| 5096 | * @dev: device to register |
| 5097 | * |
| 5098 | * Take a completed network device structure and add it to the kernel |
| 5099 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
| 5100 | * chain. 0 is returned on success. A negative errno code is returned |
| 5101 | * on a failure to set up the device, or if the name is a duplicate. |
| 5102 | * |
Borislav Petkov | 38b4da3 | 2007-04-20 22:14:10 -0700 | [diff] [blame] | 5103 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5104 | * and expands the device name if you passed a format string to |
| 5105 | * alloc_netdev. |
| 5106 | */ |
| 5107 | int register_netdev(struct net_device *dev) |
| 5108 | { |
| 5109 | int err; |
| 5110 | |
| 5111 | rtnl_lock(); |
| 5112 | |
| 5113 | /* |
| 5114 | * If the name is a format string the caller wants us to do a |
| 5115 | * name allocation. |
| 5116 | */ |
| 5117 | if (strchr(dev->name, '%')) { |
| 5118 | err = dev_alloc_name(dev, dev->name); |
| 5119 | if (err < 0) |
| 5120 | goto out; |
| 5121 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5123 | err = register_netdevice(dev); |
| 5124 | out: |
| 5125 | rtnl_unlock(); |
| 5126 | return err; |
| 5127 | } |
| 5128 | EXPORT_SYMBOL(register_netdev); |
| 5129 | |
| 5130 | /* |
| 5131 | * netdev_wait_allrefs - wait until all references are gone. |
| 5132 | * |
| 5133 | * This is called when unregistering network devices. |
| 5134 | * |
| 5135 | * Any protocol or device that holds a reference should register |
| 5136 | * for netdevice notification, and cleanup and put back the |
| 5137 | * reference if they receive an UNREGISTER event. |
| 5138 | * We can get stuck here if buggy protocols don't correctly |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5139 | * call dev_put. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5140 | */ |
| 5141 | static void netdev_wait_allrefs(struct net_device *dev) |
| 5142 | { |
| 5143 | unsigned long rebroadcast_time, warning_time; |
| 5144 | |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 5145 | linkwatch_forget_dev(dev); |
| 5146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5147 | rebroadcast_time = warning_time = jiffies; |
| 5148 | while (atomic_read(&dev->refcnt) != 0) { |
| 5149 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5150 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5151 | |
| 5152 | /* Rebroadcast unregister notification */ |
Pavel Emelyanov | 056925a | 2007-09-16 15:42:43 -0700 | [diff] [blame] | 5153 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5154 | /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users |
Octavian Purdila | 395264d | 2009-11-16 13:49:35 +0000 | [diff] [blame] | 5155 | * should have already handle it the first time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5156 | |
| 5157 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
| 5158 | &dev->state)) { |
| 5159 | /* We must not have linkwatch events |
| 5160 | * pending on unregister. If this |
| 5161 | * happens, we simply run the queue |
| 5162 | * unscheduled, resulting in a noop |
| 5163 | * for this device. |
| 5164 | */ |
| 5165 | linkwatch_run_queue(); |
| 5166 | } |
| 5167 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 5168 | __rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5169 | |
| 5170 | rebroadcast_time = jiffies; |
| 5171 | } |
| 5172 | |
| 5173 | msleep(250); |
| 5174 | |
| 5175 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
| 5176 | printk(KERN_EMERG "unregister_netdevice: " |
| 5177 | "waiting for %s to become free. Usage " |
| 5178 | "count = %d\n", |
| 5179 | dev->name, atomic_read(&dev->refcnt)); |
| 5180 | warning_time = jiffies; |
| 5181 | } |
| 5182 | } |
| 5183 | } |
| 5184 | |
| 5185 | /* The sequence is: |
| 5186 | * |
| 5187 | * rtnl_lock(); |
| 5188 | * ... |
| 5189 | * register_netdevice(x1); |
| 5190 | * register_netdevice(x2); |
| 5191 | * ... |
| 5192 | * unregister_netdevice(y1); |
| 5193 | * unregister_netdevice(y2); |
| 5194 | * ... |
| 5195 | * rtnl_unlock(); |
| 5196 | * free_netdev(y1); |
| 5197 | * free_netdev(y2); |
| 5198 | * |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5199 | * We are invoked by rtnl_unlock(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5200 | * This allows us to deal with problems: |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5201 | * 1) We can delete sysfs objects which invoke hotplug |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5202 | * without deadlocking with linkwatch via keventd. |
| 5203 | * 2) Since we run with the RTNL semaphore not held, we can sleep |
| 5204 | * 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] | 5205 | * |
| 5206 | * We must not return until all unregister events added during |
| 5207 | * the interval the lock was held have been completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5208 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5209 | void netdev_run_todo(void) |
| 5210 | { |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5211 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5213 | /* Snapshot list, allow later requests */ |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5214 | list_replace_init(&net_todo_list, &list); |
Herbert Xu | 58ec3b4 | 2008-10-07 15:50:03 -0700 | [diff] [blame] | 5215 | |
| 5216 | __rtnl_unlock(); |
Oleg Nesterov | 626ab0e | 2006-06-23 02:05:55 -0700 | [diff] [blame] | 5217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5218 | while (!list_empty(&list)) { |
| 5219 | struct net_device *dev |
stephen hemminger | e5e26d7 | 2010-02-24 14:01:38 +0000 | [diff] [blame] | 5220 | = list_first_entry(&list, struct net_device, todo_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5221 | list_del(&dev->todo_list); |
| 5222 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5223 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5224 | printk(KERN_ERR "network todo '%s' but state %d\n", |
| 5225 | dev->name, dev->reg_state); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5226 | dump_stack(); |
| 5227 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5228 | } |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5229 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5230 | dev->reg_state = NETREG_UNREGISTERED; |
| 5231 | |
Changli Gao | 152102c | 2010-03-30 20:16:22 +0000 | [diff] [blame] | 5232 | on_each_cpu(flush_backlog, dev, 1); |
Stephen Hemminger | 6e583ce | 2008-08-03 21:29:57 -0700 | [diff] [blame] | 5233 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5234 | netdev_wait_allrefs(dev); |
| 5235 | |
| 5236 | /* paranoia */ |
| 5237 | BUG_ON(atomic_read(&dev->refcnt)); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 5238 | WARN_ON(dev->ip_ptr); |
| 5239 | WARN_ON(dev->ip6_ptr); |
| 5240 | WARN_ON(dev->dn_ptr); |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5241 | |
Stephen Hemminger | b17a7c1 | 2006-05-10 13:21:17 -0700 | [diff] [blame] | 5242 | if (dev->destructor) |
| 5243 | dev->destructor(dev); |
Stephen Hemminger | 9093bbb | 2007-05-19 15:39:25 -0700 | [diff] [blame] | 5244 | |
| 5245 | /* Free network device */ |
| 5246 | kobject_put(&dev->dev.kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5248 | } |
| 5249 | |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5250 | /** |
Eric Dumazet | d83345a | 2009-11-16 03:36:51 +0000 | [diff] [blame] | 5251 | * dev_txq_stats_fold - fold tx_queues stats |
| 5252 | * @dev: device to get statistics from |
| 5253 | * @stats: struct net_device_stats to hold results |
| 5254 | */ |
| 5255 | void dev_txq_stats_fold(const struct net_device *dev, |
| 5256 | struct net_device_stats *stats) |
| 5257 | { |
| 5258 | unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0; |
| 5259 | unsigned int i; |
| 5260 | struct netdev_queue *txq; |
| 5261 | |
| 5262 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 5263 | txq = netdev_get_tx_queue(dev, i); |
| 5264 | tx_bytes += txq->tx_bytes; |
| 5265 | tx_packets += txq->tx_packets; |
| 5266 | tx_dropped += txq->tx_dropped; |
| 5267 | } |
| 5268 | if (tx_bytes || tx_packets || tx_dropped) { |
| 5269 | stats->tx_bytes = tx_bytes; |
| 5270 | stats->tx_packets = tx_packets; |
| 5271 | stats->tx_dropped = tx_dropped; |
| 5272 | } |
| 5273 | } |
| 5274 | EXPORT_SYMBOL(dev_txq_stats_fold); |
| 5275 | |
| 5276 | /** |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5277 | * dev_get_stats - get network device statistics |
| 5278 | * @dev: device to get statistics from |
| 5279 | * |
| 5280 | * Get network statistics from device. The device driver may provide |
| 5281 | * its own method by setting dev->netdev_ops->get_stats; otherwise |
| 5282 | * the internal statistics structure is used. |
| 5283 | */ |
| 5284 | const struct net_device_stats *dev_get_stats(struct net_device *dev) |
Eric Dumazet | 7004bf2 | 2009-05-18 00:34:33 +0000 | [diff] [blame] | 5285 | { |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5286 | const struct net_device_ops *ops = dev->netdev_ops; |
| 5287 | |
| 5288 | if (ops->ndo_get_stats) |
| 5289 | return ops->ndo_get_stats(dev); |
Eric Dumazet | 7004bf2 | 2009-05-18 00:34:33 +0000 | [diff] [blame] | 5290 | |
Eric Dumazet | d83345a | 2009-11-16 03:36:51 +0000 | [diff] [blame] | 5291 | dev_txq_stats_fold(dev, &dev->stats); |
| 5292 | return &dev->stats; |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5293 | } |
Stephen Hemminger | eeda3fd | 2008-11-19 21:40:23 -0800 | [diff] [blame] | 5294 | EXPORT_SYMBOL(dev_get_stats); |
Rusty Russell | c45d286 | 2007-03-28 14:29:08 -0700 | [diff] [blame] | 5295 | |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5296 | static void netdev_init_one_queue(struct net_device *dev, |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5297 | struct netdev_queue *queue, |
| 5298 | void *_unused) |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5299 | { |
David S. Miller | dc2b484 | 2008-07-08 17:18:23 -0700 | [diff] [blame] | 5300 | queue->dev = dev; |
| 5301 | } |
| 5302 | |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5303 | static void netdev_init_queues(struct net_device *dev) |
| 5304 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5305 | netdev_init_one_queue(dev, &dev->rx_queue, NULL); |
| 5306 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 5307 | spin_lock_init(&dev->tx_global_lock); |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5308 | } |
| 5309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5310 | /** |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5311 | * alloc_netdev_mq - allocate network device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5312 | * @sizeof_priv: size of private data to allocate space for |
| 5313 | * @name: device name format string |
| 5314 | * @setup: callback to initialize device |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5315 | * @queue_count: the number of subqueues to allocate |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5316 | * |
| 5317 | * 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] | 5318 | * and performs basic initialization. Also allocates subquue structs |
| 5319 | * for each queue on the device at the end of the netdevice. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5320 | */ |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5321 | struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, |
| 5322 | void (*setup)(struct net_device *), unsigned int queue_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5323 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5324 | struct netdev_queue *tx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5325 | struct net_device *dev; |
Stephen Hemminger | 7943986 | 2008-07-21 13:28:44 -0700 | [diff] [blame] | 5326 | size_t alloc_size; |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5327 | struct net_device *p; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5328 | #ifdef CONFIG_RPS |
| 5329 | struct netdev_rx_queue *rx; |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5330 | int i; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5331 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5332 | |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 5333 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
| 5334 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 5335 | alloc_size = sizeof(struct net_device); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 5336 | if (sizeof_priv) { |
| 5337 | /* ensure 32-byte alignment of private area */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5338 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
Alexey Dobriyan | d1643d2 | 2008-04-18 15:43:32 -0700 | [diff] [blame] | 5339 | alloc_size += sizeof_priv; |
| 5340 | } |
| 5341 | /* ensure 32-byte alignment of whole construct */ |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5342 | alloc_size += NETDEV_ALIGN - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5343 | |
Paolo 'Blaisorblade' Giarrusso | 31380de | 2006-04-06 22:38:28 -0700 | [diff] [blame] | 5344 | p = kzalloc(alloc_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5345 | if (!p) { |
Stephen Hemminger | b6fe17d | 2006-08-29 17:06:13 -0700 | [diff] [blame] | 5346 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5347 | return NULL; |
| 5348 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5349 | |
Stephen Hemminger | 7943986 | 2008-07-21 13:28:44 -0700 | [diff] [blame] | 5350 | tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5351 | if (!tx) { |
| 5352 | printk(KERN_ERR "alloc_netdev: Unable to allocate " |
| 5353 | "tx qdiscs.\n"); |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5354 | goto free_p; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5355 | } |
| 5356 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5357 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5358 | rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
| 5359 | if (!rx) { |
| 5360 | printk(KERN_ERR "alloc_netdev: Unable to allocate " |
| 5361 | "rx queues.\n"); |
| 5362 | goto free_tx; |
| 5363 | } |
| 5364 | |
| 5365 | atomic_set(&rx->count, queue_count); |
| 5366 | |
| 5367 | /* |
| 5368 | * Set a pointer to first element in the array which holds the |
| 5369 | * reference count. |
| 5370 | */ |
| 5371 | for (i = 0; i < queue_count; i++) |
| 5372 | rx[i].first = rx; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5373 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5374 | |
Eric Dumazet | 1ce8e7b | 2009-05-27 04:42:37 +0000 | [diff] [blame] | 5375 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5376 | dev->padded = (char *)dev - (char *)p; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5377 | |
| 5378 | if (dev_addr_init(dev)) |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5379 | goto free_rx; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5380 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5381 | dev_mc_init(dev); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 5382 | dev_uc_init(dev); |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 5383 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 5384 | dev_net_set(dev, &init_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5385 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5386 | dev->_tx = tx; |
| 5387 | dev->num_tx_queues = queue_count; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 5388 | dev->real_num_tx_queues = queue_count; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5389 | |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5390 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5391 | dev->_rx = rx; |
| 5392 | dev->num_rx_queues = queue_count; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5393 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5394 | |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 5395 | dev->gso_max_size = GSO_MAX_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5396 | |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 5397 | netdev_init_queues(dev); |
| 5398 | |
Peter P Waskiewicz Jr | 15682bc | 2010-02-10 20:03:05 -0800 | [diff] [blame] | 5399 | INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list); |
| 5400 | dev->ethtool_ntuple_list.count = 0; |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5401 | INIT_LIST_HEAD(&dev->napi_list); |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 5402 | INIT_LIST_HEAD(&dev->unreg_list); |
Eric Dumazet | e014deb | 2009-11-17 05:59:21 +0000 | [diff] [blame] | 5403 | INIT_LIST_HEAD(&dev->link_watch_list); |
Eric Dumazet | 93f154b | 2009-05-18 22:19:19 -0700 | [diff] [blame] | 5404 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5405 | setup(dev); |
| 5406 | strcpy(dev->name, name); |
| 5407 | return dev; |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5408 | |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5409 | free_rx: |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5410 | #ifdef CONFIG_RPS |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5411 | kfree(rx); |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5412 | free_tx: |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5413 | #endif |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5414 | kfree(tx); |
Jiri Pirko | ab9c73c | 2009-05-08 13:30:17 +0000 | [diff] [blame] | 5415 | free_p: |
| 5416 | kfree(p); |
| 5417 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5418 | } |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 5419 | EXPORT_SYMBOL(alloc_netdev_mq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5420 | |
| 5421 | /** |
| 5422 | * free_netdev - free network device |
| 5423 | * @dev: device |
| 5424 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5425 | * This function does the last stage of destroying an allocated device |
| 5426 | * interface. The reference to the device object is released. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5427 | * If this is the last reference then it will be freed. |
| 5428 | */ |
| 5429 | void free_netdev(struct net_device *dev) |
| 5430 | { |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5431 | struct napi_struct *p, *n; |
| 5432 | |
Denis V. Lunev | f3005d7 | 2008-04-16 02:02:18 -0700 | [diff] [blame] | 5433 | release_net(dev_net(dev)); |
| 5434 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 5435 | kfree(dev->_tx); |
| 5436 | |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 5437 | /* Flush device addresses */ |
| 5438 | dev_addr_flush(dev); |
| 5439 | |
Peter P Waskiewicz Jr | 15682bc | 2010-02-10 20:03:05 -0800 | [diff] [blame] | 5440 | /* Clear ethtool n-tuple list */ |
| 5441 | ethtool_ntuple_flush(dev); |
| 5442 | |
Herbert Xu | d565b0a | 2008-12-15 23:38:52 -0800 | [diff] [blame] | 5443 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
| 5444 | netif_napi_del(p); |
| 5445 | |
Stephen Hemminger | 3041a06 | 2006-05-26 13:25:24 -0700 | [diff] [blame] | 5446 | /* Compatibility with error handling in drivers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5447 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 5448 | kfree((char *)dev - dev->padded); |
| 5449 | return; |
| 5450 | } |
| 5451 | |
| 5452 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); |
| 5453 | dev->reg_state = NETREG_RELEASED; |
| 5454 | |
Greg Kroah-Hartman | 43cb76d | 2002-04-09 12:14:34 -0700 | [diff] [blame] | 5455 | /* will free via device release */ |
| 5456 | put_device(&dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5457 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5458 | EXPORT_SYMBOL(free_netdev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5459 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5460 | /** |
| 5461 | * synchronize_net - Synchronize with packet receive processing |
| 5462 | * |
| 5463 | * Wait for packets currently being received to be done. |
| 5464 | * Does not block later packets from starting. |
| 5465 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5466 | void synchronize_net(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5467 | { |
| 5468 | might_sleep(); |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 5469 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5470 | } |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5471 | EXPORT_SYMBOL(synchronize_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5472 | |
| 5473 | /** |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5474 | * unregister_netdevice_queue - remove device from the kernel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5475 | * @dev: device |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5476 | * @head: list |
Jaswinder Singh Rajput | 6ebfbc0 | 2009-11-22 20:43:13 -0800 | [diff] [blame] | 5477 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5478 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 5479 | * from the kernel tables. |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5480 | * If head not NULL, device is queued to be unregistered later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5481 | * |
| 5482 | * Callers must hold the rtnl semaphore. You may want |
| 5483 | * unregister_netdev() instead of this. |
| 5484 | */ |
| 5485 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5486 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5487 | { |
Herbert Xu | a662071 | 2007-12-12 19:21:56 -0800 | [diff] [blame] | 5488 | ASSERT_RTNL(); |
| 5489 | |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5490 | if (head) { |
Eric W. Biederman | 9fdce09 | 2009-10-30 14:51:13 +0000 | [diff] [blame] | 5491 | list_move_tail(&dev->unreg_list, head); |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5492 | } else { |
| 5493 | rollback_registered(dev); |
| 5494 | /* Finish processing unregister after unlock */ |
| 5495 | net_set_todo(dev); |
| 5496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5497 | } |
Eric Dumazet | 44a0873 | 2009-10-27 07:03:04 +0000 | [diff] [blame] | 5498 | EXPORT_SYMBOL(unregister_netdevice_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5499 | |
| 5500 | /** |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5501 | * unregister_netdevice_many - unregister many devices |
| 5502 | * @head: list of devices |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5503 | */ |
| 5504 | void unregister_netdevice_many(struct list_head *head) |
| 5505 | { |
| 5506 | struct net_device *dev; |
| 5507 | |
| 5508 | if (!list_empty(head)) { |
| 5509 | rollback_registered_many(head); |
| 5510 | list_for_each_entry(dev, head, unreg_list) |
| 5511 | net_set_todo(dev); |
| 5512 | } |
| 5513 | } |
Eric Dumazet | 63c8099 | 2009-10-27 07:06:49 +0000 | [diff] [blame] | 5514 | EXPORT_SYMBOL(unregister_netdevice_many); |
Eric Dumazet | 9b5e383 | 2009-10-27 07:04:19 +0000 | [diff] [blame] | 5515 | |
| 5516 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5517 | * unregister_netdev - remove device from the kernel |
| 5518 | * @dev: device |
| 5519 | * |
| 5520 | * This function shuts down a device interface and removes it |
Wang Chen | d59b54b | 2007-12-11 02:28:03 -0800 | [diff] [blame] | 5521 | * from the kernel tables. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5522 | * |
| 5523 | * This is just a wrapper for unregister_netdevice that takes |
| 5524 | * the rtnl semaphore. In general you want to use this and not |
| 5525 | * unregister_netdevice. |
| 5526 | */ |
| 5527 | void unregister_netdev(struct net_device *dev) |
| 5528 | { |
| 5529 | rtnl_lock(); |
| 5530 | unregister_netdevice(dev); |
| 5531 | rtnl_unlock(); |
| 5532 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5533 | EXPORT_SYMBOL(unregister_netdev); |
| 5534 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5535 | /** |
| 5536 | * dev_change_net_namespace - move device to different nethost namespace |
| 5537 | * @dev: device |
| 5538 | * @net: network namespace |
| 5539 | * @pat: If not NULL name pattern to try if the current device name |
| 5540 | * is already taken in the destination network namespace. |
| 5541 | * |
| 5542 | * This function shuts down a device interface and moves it |
| 5543 | * to a new network namespace. On success 0 is returned, on |
| 5544 | * a failure a netagive errno code is returned. |
| 5545 | * |
| 5546 | * Callers must hold the rtnl semaphore. |
| 5547 | */ |
| 5548 | |
| 5549 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) |
| 5550 | { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5551 | int err; |
| 5552 | |
| 5553 | ASSERT_RTNL(); |
| 5554 | |
| 5555 | /* Don't allow namespace local devices to be moved. */ |
| 5556 | err = -EINVAL; |
| 5557 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 5558 | goto out; |
| 5559 | |
| 5560 | /* Ensure the device has been registrered */ |
| 5561 | err = -EINVAL; |
| 5562 | if (dev->reg_state != NETREG_REGISTERED) |
| 5563 | goto out; |
| 5564 | |
| 5565 | /* Get out if there is nothing todo */ |
| 5566 | err = 0; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 5567 | if (net_eq(dev_net(dev), net)) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5568 | goto out; |
| 5569 | |
| 5570 | /* Pick the destination device name, and ensure |
| 5571 | * we can use it in the destination network namespace. |
| 5572 | */ |
| 5573 | err = -EEXIST; |
Octavian Purdila | d903102 | 2009-11-18 02:36:59 +0000 | [diff] [blame] | 5574 | if (__dev_get_by_name(net, dev->name)) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5575 | /* We get here if we can't use the current device name */ |
| 5576 | if (!pat) |
| 5577 | goto out; |
Daniel Lezcano | 8ce6cebc | 2010-05-19 10:12:19 +0000 | [diff] [blame] | 5578 | if (dev_get_valid_name(dev, pat, 1)) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5579 | goto out; |
| 5580 | } |
| 5581 | |
| 5582 | /* |
| 5583 | * And now a mini version of register_netdevice unregister_netdevice. |
| 5584 | */ |
| 5585 | |
| 5586 | /* If device is running close it first. */ |
Pavel Emelyanov | 9b77265 | 2007-10-10 02:49:09 -0700 | [diff] [blame] | 5587 | dev_close(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5588 | |
| 5589 | /* And unlink it from device chain */ |
| 5590 | err = -ENODEV; |
| 5591 | unlist_netdevice(dev); |
| 5592 | |
| 5593 | synchronize_net(); |
| 5594 | |
| 5595 | /* Shutdown queueing discipline. */ |
| 5596 | dev_shutdown(dev); |
| 5597 | |
| 5598 | /* Notify protocols, that we are about to destroy |
| 5599 | this device. They should clean all the things. |
| 5600 | */ |
| 5601 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 5602 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5603 | |
| 5604 | /* |
| 5605 | * Flush the unicast and multicast chains |
| 5606 | */ |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 5607 | dev_uc_flush(dev); |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 5608 | dev_mc_flush(dev); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5609 | |
| 5610 | /* Actually switch the network namespace */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 5611 | dev_net_set(dev, net); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5612 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5613 | /* If there is an ifindex conflict assign a new one */ |
| 5614 | if (__dev_get_by_index(net, dev->ifindex)) { |
| 5615 | int iflink = (dev->iflink == dev->ifindex); |
| 5616 | dev->ifindex = dev_new_index(net); |
| 5617 | if (iflink) |
| 5618 | dev->iflink = dev->ifindex; |
| 5619 | } |
| 5620 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5621 | /* Fixup kobjects */ |
Eric W. Biederman | a1b3f59 | 2010-05-04 17:36:49 -0700 | [diff] [blame] | 5622 | err = device_rename(&dev->dev, dev->name); |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5623 | WARN_ON(err); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5624 | |
| 5625 | /* Add the device back in the hashes */ |
| 5626 | list_netdevice(dev); |
| 5627 | |
| 5628 | /* Notify protocols, that a new device appeared. */ |
| 5629 | call_netdevice_notifiers(NETDEV_REGISTER, dev); |
| 5630 | |
Eric W. Biederman | d90a909 | 2009-12-12 22:11:15 +0000 | [diff] [blame] | 5631 | /* |
| 5632 | * Prevent userspace races by waiting until the network |
| 5633 | * device is fully setup before sending notifications. |
| 5634 | */ |
| 5635 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); |
| 5636 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5637 | synchronize_net(); |
| 5638 | err = 0; |
| 5639 | out: |
| 5640 | return err; |
| 5641 | } |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 5642 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5644 | static int dev_cpu_callback(struct notifier_block *nfb, |
| 5645 | unsigned long action, |
| 5646 | void *ocpu) |
| 5647 | { |
| 5648 | struct sk_buff **list_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5649 | struct sk_buff *skb; |
| 5650 | unsigned int cpu, oldcpu = (unsigned long)ocpu; |
| 5651 | struct softnet_data *sd, *oldsd; |
| 5652 | |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 5653 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5654 | return NOTIFY_OK; |
| 5655 | |
| 5656 | local_irq_disable(); |
| 5657 | cpu = smp_processor_id(); |
| 5658 | sd = &per_cpu(softnet_data, cpu); |
| 5659 | oldsd = &per_cpu(softnet_data, oldcpu); |
| 5660 | |
| 5661 | /* Find end of our completion_queue. */ |
| 5662 | list_skb = &sd->completion_queue; |
| 5663 | while (*list_skb) |
| 5664 | list_skb = &(*list_skb)->next; |
| 5665 | /* Append completion queue from offline CPU. */ |
| 5666 | *list_skb = oldsd->completion_queue; |
| 5667 | oldsd->completion_queue = NULL; |
| 5668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5669 | /* Append output queue from offline CPU. */ |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 5670 | if (oldsd->output_queue) { |
| 5671 | *sd->output_queue_tailp = oldsd->output_queue; |
| 5672 | sd->output_queue_tailp = oldsd->output_queue_tailp; |
| 5673 | oldsd->output_queue = NULL; |
| 5674 | oldsd->output_queue_tailp = &oldsd->output_queue; |
| 5675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5676 | |
| 5677 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
| 5678 | local_irq_enable(); |
| 5679 | |
| 5680 | /* Process offline CPU's input_pkt_queue */ |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 5681 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
| 5682 | netif_rx(skb); |
| 5683 | input_queue_head_incr(oldsd); |
| 5684 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 5685 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5686 | netif_rx(skb); |
Tom Herbert | 76cc8b1 | 2010-05-20 18:37:59 +0000 | [diff] [blame] | 5687 | input_queue_head_incr(oldsd); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 5688 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5689 | |
| 5690 | return NOTIFY_OK; |
| 5691 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5692 | |
| 5693 | |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5694 | /** |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5695 | * netdev_increment_features - increment feature set by one |
| 5696 | * @all: current feature set |
| 5697 | * @one: new feature set |
| 5698 | * @mask: mask feature set |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5699 | * |
| 5700 | * Computes a new feature set after adding a device with feature set |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5701 | * @one to the master device with current feature set @all. Will not |
| 5702 | * enable anything that is off in @mask. Returns the new feature set. |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5703 | */ |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5704 | unsigned long netdev_increment_features(unsigned long all, unsigned long one, |
| 5705 | unsigned long mask) |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5706 | { |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5707 | /* If device needs checksumming, downgrade to it. */ |
Eric Dumazet | d1b19df | 2009-09-03 01:29:39 -0700 | [diff] [blame] | 5708 | if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM)) |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5709 | all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM); |
| 5710 | else if (mask & NETIF_F_ALL_CSUM) { |
| 5711 | /* If one device supports v4/v6 checksumming, set for all. */ |
| 5712 | if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) && |
| 5713 | !(all & NETIF_F_GEN_CSUM)) { |
| 5714 | all &= ~NETIF_F_ALL_CSUM; |
| 5715 | all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); |
| 5716 | } |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5717 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5718 | /* If one device supports hw checksumming, set for all. */ |
| 5719 | if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) { |
| 5720 | all &= ~NETIF_F_ALL_CSUM; |
| 5721 | all |= NETIF_F_HW_CSUM; |
| 5722 | } |
| 5723 | } |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5724 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5725 | one |= NETIF_F_ALL_CSUM; |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5726 | |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5727 | one |= all & NETIF_F_ONE_FOR_ALL; |
Sridhar Samudrala | d9f5950 | 2009-10-07 12:24:25 +0000 | [diff] [blame] | 5728 | all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO; |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5729 | all |= one & mask & NETIF_F_ONE_FOR_ALL; |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5730 | |
| 5731 | return all; |
| 5732 | } |
Herbert Xu | b63365a | 2008-10-23 01:11:29 -0700 | [diff] [blame] | 5733 | EXPORT_SYMBOL(netdev_increment_features); |
Herbert Xu | 7f353bf | 2007-08-10 15:47:58 -0700 | [diff] [blame] | 5734 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5735 | static struct hlist_head *netdev_create_hash(void) |
| 5736 | { |
| 5737 | int i; |
| 5738 | struct hlist_head *hash; |
| 5739 | |
| 5740 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); |
| 5741 | if (hash != NULL) |
| 5742 | for (i = 0; i < NETDEV_HASHENTRIES; i++) |
| 5743 | INIT_HLIST_HEAD(&hash[i]); |
| 5744 | |
| 5745 | return hash; |
| 5746 | } |
| 5747 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5748 | /* Initialize per network namespace state */ |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5749 | static int __net_init netdev_init(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5750 | { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5751 | INIT_LIST_HEAD(&net->dev_base_head); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5752 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5753 | net->dev_name_head = netdev_create_hash(); |
| 5754 | if (net->dev_name_head == NULL) |
| 5755 | goto err_name; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5756 | |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5757 | net->dev_index_head = netdev_create_hash(); |
| 5758 | if (net->dev_index_head == NULL) |
| 5759 | goto err_idx; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5760 | |
| 5761 | return 0; |
Pavel Emelyanov | 30d97d3 | 2007-09-16 15:40:33 -0700 | [diff] [blame] | 5762 | |
| 5763 | err_idx: |
| 5764 | kfree(net->dev_name_head); |
| 5765 | err_name: |
| 5766 | return -ENOMEM; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5767 | } |
| 5768 | |
Stephen Hemminger | f0db275 | 2008-09-30 02:23:58 -0700 | [diff] [blame] | 5769 | /** |
| 5770 | * netdev_drivername - network driver for the device |
| 5771 | * @dev: network device |
| 5772 | * @buffer: buffer for resulting name |
| 5773 | * @len: size of buffer |
| 5774 | * |
| 5775 | * Determine network driver for device. |
| 5776 | */ |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 5777 | char *netdev_drivername(const struct net_device *dev, char *buffer, int len) |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 5778 | { |
Stephen Hemminger | cf04a4c7 | 2008-09-30 02:22:14 -0700 | [diff] [blame] | 5779 | const struct device_driver *driver; |
| 5780 | const struct device *parent; |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 5781 | |
| 5782 | if (len <= 0 || !buffer) |
| 5783 | return buffer; |
| 5784 | buffer[0] = 0; |
| 5785 | |
| 5786 | parent = dev->dev.parent; |
| 5787 | |
| 5788 | if (!parent) |
| 5789 | return buffer; |
| 5790 | |
| 5791 | driver = parent->driver; |
| 5792 | if (driver && driver->name) |
| 5793 | strlcpy(buffer, driver->name, len); |
| 5794 | return buffer; |
| 5795 | } |
| 5796 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5797 | static void __net_exit netdev_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5798 | { |
| 5799 | kfree(net->dev_name_head); |
| 5800 | kfree(net->dev_index_head); |
| 5801 | } |
| 5802 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 5803 | static struct pernet_operations __net_initdata netdev_net_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5804 | .init = netdev_init, |
| 5805 | .exit = netdev_exit, |
| 5806 | }; |
| 5807 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 5808 | static void __net_exit default_device_exit(struct net *net) |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5809 | { |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5810 | struct net_device *dev, *aux; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5811 | /* |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5812 | * Push all migratable network devices back to the |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5813 | * initial network namespace |
| 5814 | */ |
| 5815 | rtnl_lock(); |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5816 | for_each_netdev_safe(net, dev, aux) { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5817 | int err; |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5818 | char fb_name[IFNAMSIZ]; |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5819 | |
| 5820 | /* Ignore unmoveable devices (i.e. loopback) */ |
| 5821 | if (dev->features & NETIF_F_NETNS_LOCAL) |
| 5822 | continue; |
| 5823 | |
Eric W. Biederman | e008b5f | 2009-11-29 22:25:30 +0000 | [diff] [blame] | 5824 | /* Leave virtual devices for the generic cleanup */ |
| 5825 | if (dev->rtnl_link_ops) |
| 5826 | continue; |
Eric W. Biederman | d0c082c | 2008-11-05 15:59:38 -0800 | [diff] [blame] | 5827 | |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5828 | /* Push remaing network devices to init_net */ |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5829 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
| 5830 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5831 | if (err) { |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5832 | 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] | 5833 | __func__, dev->name, err); |
Pavel Emelyanov | aca5139 | 2008-05-08 01:24:25 -0700 | [diff] [blame] | 5834 | BUG(); |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5835 | } |
| 5836 | } |
| 5837 | rtnl_unlock(); |
| 5838 | } |
| 5839 | |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 5840 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
| 5841 | { |
| 5842 | /* At exit all network devices most be removed from a network |
| 5843 | * namespace. Do this in the reverse order of registeration. |
| 5844 | * Do this across as many network namespaces as possible to |
| 5845 | * improve batching efficiency. |
| 5846 | */ |
| 5847 | struct net_device *dev; |
| 5848 | struct net *net; |
| 5849 | LIST_HEAD(dev_kill_list); |
| 5850 | |
| 5851 | rtnl_lock(); |
| 5852 | list_for_each_entry(net, net_list, exit_list) { |
| 5853 | for_each_netdev_reverse(net, dev) { |
| 5854 | if (dev->rtnl_link_ops) |
| 5855 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
| 5856 | else |
| 5857 | unregister_netdevice_queue(dev, &dev_kill_list); |
| 5858 | } |
| 5859 | } |
| 5860 | unregister_netdevice_many(&dev_kill_list); |
| 5861 | rtnl_unlock(); |
| 5862 | } |
| 5863 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 5864 | static struct pernet_operations __net_initdata default_device_ops = { |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5865 | .exit = default_device_exit, |
Eric W. Biederman | 04dc7f6b | 2009-12-03 02:29:04 +0000 | [diff] [blame] | 5866 | .exit_batch = default_device_exit_batch, |
Eric W. Biederman | ce286d3 | 2007-09-12 13:53:49 +0200 | [diff] [blame] | 5867 | }; |
| 5868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5869 | /* |
| 5870 | * Initialize the DEV module. At boot time this walks the device list and |
| 5871 | * unhooks any devices that fail to initialise (normally hardware not |
| 5872 | * present) and leaves us with a valid list of present and active devices. |
| 5873 | * |
| 5874 | */ |
| 5875 | |
| 5876 | /* |
| 5877 | * This is called single threaded during boot, so no need |
| 5878 | * to take the rtnl semaphore. |
| 5879 | */ |
| 5880 | static int __init net_dev_init(void) |
| 5881 | { |
| 5882 | int i, rc = -ENOMEM; |
| 5883 | |
| 5884 | BUG_ON(!dev_boot_phase); |
| 5885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5886 | if (dev_proc_init()) |
| 5887 | goto out; |
| 5888 | |
Eric W. Biederman | 8b41d18 | 2007-09-26 22:02:53 -0700 | [diff] [blame] | 5889 | if (netdev_kobject_init()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5890 | goto out; |
| 5891 | |
| 5892 | INIT_LIST_HEAD(&ptype_all); |
Pavel Emelyanov | 82d8a867 | 2007-11-26 20:12:58 +0800 | [diff] [blame] | 5893 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5894 | INIT_LIST_HEAD(&ptype_base[i]); |
| 5895 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 5896 | if (register_pernet_subsys(&netdev_net_ops)) |
| 5897 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5898 | |
| 5899 | /* |
| 5900 | * Initialise the packet receive queues. |
| 5901 | */ |
| 5902 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 5903 | for_each_possible_cpu(i) { |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 5904 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5905 | |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 5906 | memset(sd, 0, sizeof(*sd)); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 5907 | skb_queue_head_init(&sd->input_pkt_queue); |
Changli Gao | 6e7676c | 2010-04-27 15:07:33 -0700 | [diff] [blame] | 5908 | skb_queue_head_init(&sd->process_queue); |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 5909 | sd->completion_queue = NULL; |
| 5910 | INIT_LIST_HEAD(&sd->poll_list); |
Changli Gao | a9cbd58 | 2010-04-26 23:06:24 +0000 | [diff] [blame] | 5911 | sd->output_queue = NULL; |
| 5912 | sd->output_queue_tailp = &sd->output_queue; |
Eric Dumazet | df33454 | 2010-03-24 19:13:54 +0000 | [diff] [blame] | 5913 | #ifdef CONFIG_RPS |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 5914 | sd->csd.func = rps_trigger_softirq; |
| 5915 | sd->csd.info = sd; |
| 5916 | sd->csd.flags = 0; |
| 5917 | sd->cpu = i; |
Tom Herbert | 1e94d72 | 2010-03-18 17:45:44 -0700 | [diff] [blame] | 5918 | #endif |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5919 | |
Eric Dumazet | e36fa2f | 2010-04-19 21:17:14 +0000 | [diff] [blame] | 5920 | sd->backlog.poll = process_backlog; |
| 5921 | sd->backlog.weight = weight_p; |
| 5922 | sd->backlog.gro_list = NULL; |
| 5923 | sd->backlog.gro_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5924 | } |
| 5925 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5926 | dev_boot_phase = 0; |
| 5927 | |
Eric W. Biederman | 505d4f7 | 2008-11-07 22:54:20 -0800 | [diff] [blame] | 5928 | /* The loopback device is special if any other network devices |
| 5929 | * is present in a network namespace the loopback device must |
| 5930 | * be present. Since we now dynamically allocate and free the |
| 5931 | * loopback device ensure this invariant is maintained by |
| 5932 | * keeping the loopback device as the first device on the |
| 5933 | * list of network devices. Ensuring the loopback devices |
| 5934 | * is the first device that appears and the last network device |
| 5935 | * that disappears. |
| 5936 | */ |
| 5937 | if (register_pernet_device(&loopback_net_ops)) |
| 5938 | goto out; |
| 5939 | |
| 5940 | if (register_pernet_device(&default_device_ops)) |
| 5941 | goto out; |
| 5942 | |
Carlos R. Mafra | 962cf36 | 2008-05-15 11:15:37 -0300 | [diff] [blame] | 5943 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
| 5944 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5945 | |
| 5946 | hotcpu_notifier(dev_cpu_callback, 0); |
| 5947 | dst_init(); |
| 5948 | dev_mcast_init(); |
| 5949 | rc = 0; |
| 5950 | out: |
| 5951 | return rc; |
| 5952 | } |
| 5953 | |
| 5954 | subsys_initcall(net_dev_init); |
| 5955 | |
Krishna Kumar | e88721f | 2009-02-18 17:55:02 -0800 | [diff] [blame] | 5956 | static int __init initialize_hashrnd(void) |
| 5957 | { |
Tom Herbert | 0a9627f | 2010-03-16 08:03:29 +0000 | [diff] [blame] | 5958 | get_random_bytes(&hashrnd, sizeof(hashrnd)); |
Krishna Kumar | e88721f | 2009-02-18 17:55:02 -0800 | [diff] [blame] | 5959 | return 0; |
| 5960 | } |
| 5961 | |
| 5962 | late_initcall_sync(initialize_hashrnd); |
| 5963 | |