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Commit | Line | Data |
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1da177e4 LT |
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 | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
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> | |
1da177e4 | 76 | #include <linux/bitops.h> |
4fc268d2 | 77 | #include <linux/capability.h> |
1da177e4 LT |
78 | #include <linux/cpu.h> |
79 | #include <linux/types.h> | |
80 | #include <linux/kernel.h> | |
08e9897d | 81 | #include <linux/hash.h> |
5a0e3ad6 | 82 | #include <linux/slab.h> |
1da177e4 | 83 | #include <linux/sched.h> |
4a3e2f71 | 84 | #include <linux/mutex.h> |
1da177e4 LT |
85 | #include <linux/string.h> |
86 | #include <linux/mm.h> | |
87 | #include <linux/socket.h> | |
88 | #include <linux/sockios.h> | |
89 | #include <linux/errno.h> | |
90 | #include <linux/interrupt.h> | |
91 | #include <linux/if_ether.h> | |
92 | #include <linux/netdevice.h> | |
93 | #include <linux/etherdevice.h> | |
0187bdfb | 94 | #include <linux/ethtool.h> |
1da177e4 LT |
95 | #include <linux/notifier.h> |
96 | #include <linux/skbuff.h> | |
457c4cbc | 97 | #include <net/net_namespace.h> |
1da177e4 LT |
98 | #include <net/sock.h> |
99 | #include <linux/rtnetlink.h> | |
1da177e4 | 100 | #include <linux/stat.h> |
1da177e4 LT |
101 | #include <net/dst.h> |
102 | #include <net/pkt_sched.h> | |
103 | #include <net/checksum.h> | |
44540960 | 104 | #include <net/xfrm.h> |
1da177e4 LT |
105 | #include <linux/highmem.h> |
106 | #include <linux/init.h> | |
1da177e4 | 107 | #include <linux/module.h> |
1da177e4 LT |
108 | #include <linux/netpoll.h> |
109 | #include <linux/rcupdate.h> | |
110 | #include <linux/delay.h> | |
1da177e4 | 111 | #include <net/iw_handler.h> |
1da177e4 | 112 | #include <asm/current.h> |
5bdb9886 | 113 | #include <linux/audit.h> |
db217334 | 114 | #include <linux/dmaengine.h> |
f6a78bfc | 115 | #include <linux/err.h> |
c7fa9d18 | 116 | #include <linux/ctype.h> |
723e98b7 | 117 | #include <linux/if_arp.h> |
6de329e2 | 118 | #include <linux/if_vlan.h> |
8f0f2223 | 119 | #include <linux/ip.h> |
ad55dcaf | 120 | #include <net/ip.h> |
25cd9ba0 | 121 | #include <net/mpls.h> |
8f0f2223 DM |
122 | #include <linux/ipv6.h> |
123 | #include <linux/in.h> | |
b6b2fed1 DM |
124 | #include <linux/jhash.h> |
125 | #include <linux/random.h> | |
9cbc1cb8 | 126 | #include <trace/events/napi.h> |
cf66ba58 | 127 | #include <trace/events/net.h> |
07dc22e7 | 128 | #include <trace/events/skb.h> |
5acbbd42 | 129 | #include <linux/pci.h> |
caeda9b9 | 130 | #include <linux/inetdevice.h> |
c445477d | 131 | #include <linux/cpu_rmap.h> |
c5905afb | 132 | #include <linux/static_key.h> |
af12fa6e | 133 | #include <linux/hashtable.h> |
60877a32 | 134 | #include <linux/vmalloc.h> |
529d0489 | 135 | #include <linux/if_macvlan.h> |
e7fd2885 | 136 | #include <linux/errqueue.h> |
1da177e4 | 137 | |
342709ef PE |
138 | #include "net-sysfs.h" |
139 | ||
d565b0a1 HX |
140 | /* Instead of increasing this, you should create a hash table. */ |
141 | #define MAX_GRO_SKBS 8 | |
142 | ||
5d38a079 HX |
143 | /* This should be increased if a protocol with a bigger head is added. */ |
144 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
145 | ||
1da177e4 | 146 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 147 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
148 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
149 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 150 | static struct list_head offload_base __read_mostly; |
1da177e4 | 151 | |
ae78dbfa | 152 | static int netif_rx_internal(struct sk_buff *skb); |
54951194 LP |
153 | static int call_netdevice_notifiers_info(unsigned long val, |
154 | struct net_device *dev, | |
155 | struct netdev_notifier_info *info); | |
ae78dbfa | 156 | |
1da177e4 | 157 | /* |
7562f876 | 158 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
159 | * semaphore. |
160 | * | |
c6d14c84 | 161 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
162 | * |
163 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 164 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
165 | * actual updates. This allows pure readers to access the list even |
166 | * while a writer is preparing to update it. | |
167 | * | |
168 | * To put it another way, dev_base_lock is held for writing only to | |
169 | * protect against pure readers; the rtnl semaphore provides the | |
170 | * protection against other writers. | |
171 | * | |
172 | * See, for example usages, register_netdevice() and | |
173 | * unregister_netdevice(), which must be called with the rtnl | |
174 | * semaphore held. | |
175 | */ | |
1da177e4 | 176 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
177 | EXPORT_SYMBOL(dev_base_lock); |
178 | ||
af12fa6e ET |
179 | /* protects napi_hash addition/deletion and napi_gen_id */ |
180 | static DEFINE_SPINLOCK(napi_hash_lock); | |
181 | ||
182 | static unsigned int napi_gen_id; | |
183 | static DEFINE_HASHTABLE(napi_hash, 8); | |
184 | ||
18afa4b0 | 185 | static seqcount_t devnet_rename_seq; |
c91f6df2 | 186 | |
4e985ada TG |
187 | static inline void dev_base_seq_inc(struct net *net) |
188 | { | |
189 | while (++net->dev_base_seq == 0); | |
190 | } | |
191 | ||
881d966b | 192 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 193 | { |
95c96174 ED |
194 | unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
195 | ||
08e9897d | 196 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
197 | } |
198 | ||
881d966b | 199 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 200 | { |
7c28bd0b | 201 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
202 | } |
203 | ||
e36fa2f7 | 204 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
205 | { |
206 | #ifdef CONFIG_RPS | |
e36fa2f7 | 207 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
208 | #endif |
209 | } | |
210 | ||
e36fa2f7 | 211 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
212 | { |
213 | #ifdef CONFIG_RPS | |
e36fa2f7 | 214 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
215 | #endif |
216 | } | |
217 | ||
ce286d32 | 218 | /* Device list insertion */ |
53759be9 | 219 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 220 | { |
c346dca1 | 221 | struct net *net = dev_net(dev); |
ce286d32 EB |
222 | |
223 | ASSERT_RTNL(); | |
224 | ||
225 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 226 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 227 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
228 | hlist_add_head_rcu(&dev->index_hlist, |
229 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 230 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
231 | |
232 | dev_base_seq_inc(net); | |
ce286d32 EB |
233 | } |
234 | ||
fb699dfd ED |
235 | /* Device list removal |
236 | * caller must respect a RCU grace period before freeing/reusing dev | |
237 | */ | |
ce286d32 EB |
238 | static void unlist_netdevice(struct net_device *dev) |
239 | { | |
240 | ASSERT_RTNL(); | |
241 | ||
242 | /* Unlink dev from the device chain */ | |
243 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 244 | list_del_rcu(&dev->dev_list); |
72c9528b | 245 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 246 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 247 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
248 | |
249 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
250 | } |
251 | ||
1da177e4 LT |
252 | /* |
253 | * Our notifier list | |
254 | */ | |
255 | ||
f07d5b94 | 256 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
257 | |
258 | /* | |
259 | * Device drivers call our routines to queue packets here. We empty the | |
260 | * queue in the local softnet handler. | |
261 | */ | |
bea3348e | 262 | |
9958da05 | 263 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 264 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 265 | |
cf508b12 | 266 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 267 | /* |
c773e847 | 268 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
269 | * according to dev->type |
270 | */ | |
271 | static const unsigned short netdev_lock_type[] = | |
272 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
273 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
274 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
275 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
276 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
277 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
278 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
279 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
280 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
281 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
282 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
283 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
211ed865 PG |
284 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
285 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
286 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
723e98b7 | 287 | |
36cbd3dc | 288 | static const char *const netdev_lock_name[] = |
723e98b7 JP |
289 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
290 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
291 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
292 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
293 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
294 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
295 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
296 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
297 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
298 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
299 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
300 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
211ed865 PG |
301 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", |
302 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
303 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
723e98b7 JP |
304 | |
305 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 306 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
307 | |
308 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
309 | { | |
310 | int i; | |
311 | ||
312 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
313 | if (netdev_lock_type[i] == dev_type) | |
314 | return i; | |
315 | /* the last key is used by default */ | |
316 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
317 | } | |
318 | ||
cf508b12 DM |
319 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
320 | unsigned short dev_type) | |
723e98b7 JP |
321 | { |
322 | int i; | |
323 | ||
324 | i = netdev_lock_pos(dev_type); | |
325 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
326 | netdev_lock_name[i]); | |
327 | } | |
cf508b12 DM |
328 | |
329 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
330 | { | |
331 | int i; | |
332 | ||
333 | i = netdev_lock_pos(dev->type); | |
334 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
335 | &netdev_addr_lock_key[i], | |
336 | netdev_lock_name[i]); | |
337 | } | |
723e98b7 | 338 | #else |
cf508b12 DM |
339 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
340 | unsigned short dev_type) | |
341 | { | |
342 | } | |
343 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
344 | { |
345 | } | |
346 | #endif | |
1da177e4 LT |
347 | |
348 | /******************************************************************************* | |
349 | ||
350 | Protocol management and registration routines | |
351 | ||
352 | *******************************************************************************/ | |
353 | ||
1da177e4 LT |
354 | /* |
355 | * Add a protocol ID to the list. Now that the input handler is | |
356 | * smarter we can dispense with all the messy stuff that used to be | |
357 | * here. | |
358 | * | |
359 | * BEWARE!!! Protocol handlers, mangling input packets, | |
360 | * MUST BE last in hash buckets and checking protocol handlers | |
361 | * MUST start from promiscuous ptype_all chain in net_bh. | |
362 | * It is true now, do not change it. | |
363 | * Explanation follows: if protocol handler, mangling packet, will | |
364 | * be the first on list, it is not able to sense, that packet | |
365 | * is cloned and should be copied-on-write, so that it will | |
366 | * change it and subsequent readers will get broken packet. | |
367 | * --ANK (980803) | |
368 | */ | |
369 | ||
c07b68e8 ED |
370 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
371 | { | |
372 | if (pt->type == htons(ETH_P_ALL)) | |
373 | return &ptype_all; | |
374 | else | |
375 | return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
376 | } | |
377 | ||
1da177e4 LT |
378 | /** |
379 | * dev_add_pack - add packet handler | |
380 | * @pt: packet type declaration | |
381 | * | |
382 | * Add a protocol handler to the networking stack. The passed &packet_type | |
383 | * is linked into kernel lists and may not be freed until it has been | |
384 | * removed from the kernel lists. | |
385 | * | |
4ec93edb | 386 | * This call does not sleep therefore it can not |
1da177e4 LT |
387 | * guarantee all CPU's that are in middle of receiving packets |
388 | * will see the new packet type (until the next received packet). | |
389 | */ | |
390 | ||
391 | void dev_add_pack(struct packet_type *pt) | |
392 | { | |
c07b68e8 | 393 | struct list_head *head = ptype_head(pt); |
1da177e4 | 394 | |
c07b68e8 ED |
395 | spin_lock(&ptype_lock); |
396 | list_add_rcu(&pt->list, head); | |
397 | spin_unlock(&ptype_lock); | |
1da177e4 | 398 | } |
d1b19dff | 399 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 400 | |
1da177e4 LT |
401 | /** |
402 | * __dev_remove_pack - remove packet handler | |
403 | * @pt: packet type declaration | |
404 | * | |
405 | * Remove a protocol handler that was previously added to the kernel | |
406 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
407 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 408 | * returns. |
1da177e4 LT |
409 | * |
410 | * The packet type might still be in use by receivers | |
411 | * and must not be freed until after all the CPU's have gone | |
412 | * through a quiescent state. | |
413 | */ | |
414 | void __dev_remove_pack(struct packet_type *pt) | |
415 | { | |
c07b68e8 | 416 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
417 | struct packet_type *pt1; |
418 | ||
c07b68e8 | 419 | spin_lock(&ptype_lock); |
1da177e4 LT |
420 | |
421 | list_for_each_entry(pt1, head, list) { | |
422 | if (pt == pt1) { | |
423 | list_del_rcu(&pt->list); | |
424 | goto out; | |
425 | } | |
426 | } | |
427 | ||
7b6cd1ce | 428 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 429 | out: |
c07b68e8 | 430 | spin_unlock(&ptype_lock); |
1da177e4 | 431 | } |
d1b19dff ED |
432 | EXPORT_SYMBOL(__dev_remove_pack); |
433 | ||
1da177e4 LT |
434 | /** |
435 | * dev_remove_pack - remove packet handler | |
436 | * @pt: packet type declaration | |
437 | * | |
438 | * Remove a protocol handler that was previously added to the kernel | |
439 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
440 | * from the kernel lists and can be freed or reused once this function | |
441 | * returns. | |
442 | * | |
443 | * This call sleeps to guarantee that no CPU is looking at the packet | |
444 | * type after return. | |
445 | */ | |
446 | void dev_remove_pack(struct packet_type *pt) | |
447 | { | |
448 | __dev_remove_pack(pt); | |
4ec93edb | 449 | |
1da177e4 LT |
450 | synchronize_net(); |
451 | } | |
d1b19dff | 452 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 453 | |
62532da9 VY |
454 | |
455 | /** | |
456 | * dev_add_offload - register offload handlers | |
457 | * @po: protocol offload declaration | |
458 | * | |
459 | * Add protocol offload handlers to the networking stack. The passed | |
460 | * &proto_offload is linked into kernel lists and may not be freed until | |
461 | * it has been removed from the kernel lists. | |
462 | * | |
463 | * This call does not sleep therefore it can not | |
464 | * guarantee all CPU's that are in middle of receiving packets | |
465 | * will see the new offload handlers (until the next received packet). | |
466 | */ | |
467 | void dev_add_offload(struct packet_offload *po) | |
468 | { | |
469 | struct list_head *head = &offload_base; | |
470 | ||
471 | spin_lock(&offload_lock); | |
472 | list_add_rcu(&po->list, head); | |
473 | spin_unlock(&offload_lock); | |
474 | } | |
475 | EXPORT_SYMBOL(dev_add_offload); | |
476 | ||
477 | /** | |
478 | * __dev_remove_offload - remove offload handler | |
479 | * @po: packet offload declaration | |
480 | * | |
481 | * Remove a protocol offload handler that was previously added to the | |
482 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
483 | * is removed from the kernel lists and can be freed or reused once this | |
484 | * function returns. | |
485 | * | |
486 | * The packet type might still be in use by receivers | |
487 | * and must not be freed until after all the CPU's have gone | |
488 | * through a quiescent state. | |
489 | */ | |
1d143d9f | 490 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
491 | { |
492 | struct list_head *head = &offload_base; | |
493 | struct packet_offload *po1; | |
494 | ||
c53aa505 | 495 | spin_lock(&offload_lock); |
62532da9 VY |
496 | |
497 | list_for_each_entry(po1, head, list) { | |
498 | if (po == po1) { | |
499 | list_del_rcu(&po->list); | |
500 | goto out; | |
501 | } | |
502 | } | |
503 | ||
504 | pr_warn("dev_remove_offload: %p not found\n", po); | |
505 | out: | |
c53aa505 | 506 | spin_unlock(&offload_lock); |
62532da9 | 507 | } |
62532da9 VY |
508 | |
509 | /** | |
510 | * dev_remove_offload - remove packet offload handler | |
511 | * @po: packet offload declaration | |
512 | * | |
513 | * Remove a packet offload handler that was previously added to the kernel | |
514 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
515 | * removed from the kernel lists and can be freed or reused once this | |
516 | * function returns. | |
517 | * | |
518 | * This call sleeps to guarantee that no CPU is looking at the packet | |
519 | * type after return. | |
520 | */ | |
521 | void dev_remove_offload(struct packet_offload *po) | |
522 | { | |
523 | __dev_remove_offload(po); | |
524 | ||
525 | synchronize_net(); | |
526 | } | |
527 | EXPORT_SYMBOL(dev_remove_offload); | |
528 | ||
1da177e4 LT |
529 | /****************************************************************************** |
530 | ||
531 | Device Boot-time Settings Routines | |
532 | ||
533 | *******************************************************************************/ | |
534 | ||
535 | /* Boot time configuration table */ | |
536 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
537 | ||
538 | /** | |
539 | * netdev_boot_setup_add - add new setup entry | |
540 | * @name: name of the device | |
541 | * @map: configured settings for the device | |
542 | * | |
543 | * Adds new setup entry to the dev_boot_setup list. The function | |
544 | * returns 0 on error and 1 on success. This is a generic routine to | |
545 | * all netdevices. | |
546 | */ | |
547 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
548 | { | |
549 | struct netdev_boot_setup *s; | |
550 | int i; | |
551 | ||
552 | s = dev_boot_setup; | |
553 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
554 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
555 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 556 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
557 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
558 | break; | |
559 | } | |
560 | } | |
561 | ||
562 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
563 | } | |
564 | ||
565 | /** | |
566 | * netdev_boot_setup_check - check boot time settings | |
567 | * @dev: the netdevice | |
568 | * | |
569 | * Check boot time settings for the device. | |
570 | * The found settings are set for the device to be used | |
571 | * later in the device probing. | |
572 | * Returns 0 if no settings found, 1 if they are. | |
573 | */ | |
574 | int netdev_boot_setup_check(struct net_device *dev) | |
575 | { | |
576 | struct netdev_boot_setup *s = dev_boot_setup; | |
577 | int i; | |
578 | ||
579 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
580 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 581 | !strcmp(dev->name, s[i].name)) { |
1da177e4 LT |
582 | dev->irq = s[i].map.irq; |
583 | dev->base_addr = s[i].map.base_addr; | |
584 | dev->mem_start = s[i].map.mem_start; | |
585 | dev->mem_end = s[i].map.mem_end; | |
586 | return 1; | |
587 | } | |
588 | } | |
589 | return 0; | |
590 | } | |
d1b19dff | 591 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
592 | |
593 | ||
594 | /** | |
595 | * netdev_boot_base - get address from boot time settings | |
596 | * @prefix: prefix for network device | |
597 | * @unit: id for network device | |
598 | * | |
599 | * Check boot time settings for the base address of device. | |
600 | * The found settings are set for the device to be used | |
601 | * later in the device probing. | |
602 | * Returns 0 if no settings found. | |
603 | */ | |
604 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
605 | { | |
606 | const struct netdev_boot_setup *s = dev_boot_setup; | |
607 | char name[IFNAMSIZ]; | |
608 | int i; | |
609 | ||
610 | sprintf(name, "%s%d", prefix, unit); | |
611 | ||
612 | /* | |
613 | * If device already registered then return base of 1 | |
614 | * to indicate not to probe for this interface | |
615 | */ | |
881d966b | 616 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
617 | return 1; |
618 | ||
619 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
620 | if (!strcmp(name, s[i].name)) | |
621 | return s[i].map.base_addr; | |
622 | return 0; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Saves at boot time configured settings for any netdevice. | |
627 | */ | |
628 | int __init netdev_boot_setup(char *str) | |
629 | { | |
630 | int ints[5]; | |
631 | struct ifmap map; | |
632 | ||
633 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
634 | if (!str || !*str) | |
635 | return 0; | |
636 | ||
637 | /* Save settings */ | |
638 | memset(&map, 0, sizeof(map)); | |
639 | if (ints[0] > 0) | |
640 | map.irq = ints[1]; | |
641 | if (ints[0] > 1) | |
642 | map.base_addr = ints[2]; | |
643 | if (ints[0] > 2) | |
644 | map.mem_start = ints[3]; | |
645 | if (ints[0] > 3) | |
646 | map.mem_end = ints[4]; | |
647 | ||
648 | /* Add new entry to the list */ | |
649 | return netdev_boot_setup_add(str, &map); | |
650 | } | |
651 | ||
652 | __setup("netdev=", netdev_boot_setup); | |
653 | ||
654 | /******************************************************************************* | |
655 | ||
656 | Device Interface Subroutines | |
657 | ||
658 | *******************************************************************************/ | |
659 | ||
660 | /** | |
661 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 662 | * @net: the applicable net namespace |
1da177e4 LT |
663 | * @name: name to find |
664 | * | |
665 | * Find an interface by name. Must be called under RTNL semaphore | |
666 | * or @dev_base_lock. If the name is found a pointer to the device | |
667 | * is returned. If the name is not found then %NULL is returned. The | |
668 | * reference counters are not incremented so the caller must be | |
669 | * careful with locks. | |
670 | */ | |
671 | ||
881d966b | 672 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 673 | { |
0bd8d536 ED |
674 | struct net_device *dev; |
675 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 676 | |
b67bfe0d | 677 | hlist_for_each_entry(dev, head, name_hlist) |
1da177e4 LT |
678 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
679 | return dev; | |
0bd8d536 | 680 | |
1da177e4 LT |
681 | return NULL; |
682 | } | |
d1b19dff | 683 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 684 | |
72c9528b ED |
685 | /** |
686 | * dev_get_by_name_rcu - find a device by its name | |
687 | * @net: the applicable net namespace | |
688 | * @name: name to find | |
689 | * | |
690 | * Find an interface by name. | |
691 | * If the name is found a pointer to the device is returned. | |
692 | * If the name is not found then %NULL is returned. | |
693 | * The reference counters are not incremented so the caller must be | |
694 | * careful with locks. The caller must hold RCU lock. | |
695 | */ | |
696 | ||
697 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
698 | { | |
72c9528b ED |
699 | struct net_device *dev; |
700 | struct hlist_head *head = dev_name_hash(net, name); | |
701 | ||
b67bfe0d | 702 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
72c9528b ED |
703 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
704 | return dev; | |
705 | ||
706 | return NULL; | |
707 | } | |
708 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
709 | ||
1da177e4 LT |
710 | /** |
711 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 712 | * @net: the applicable net namespace |
1da177e4 LT |
713 | * @name: name to find |
714 | * | |
715 | * Find an interface by name. This can be called from any | |
716 | * context and does its own locking. The returned handle has | |
717 | * the usage count incremented and the caller must use dev_put() to | |
718 | * release it when it is no longer needed. %NULL is returned if no | |
719 | * matching device is found. | |
720 | */ | |
721 | ||
881d966b | 722 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
723 | { |
724 | struct net_device *dev; | |
725 | ||
72c9528b ED |
726 | rcu_read_lock(); |
727 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
728 | if (dev) |
729 | dev_hold(dev); | |
72c9528b | 730 | rcu_read_unlock(); |
1da177e4 LT |
731 | return dev; |
732 | } | |
d1b19dff | 733 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
734 | |
735 | /** | |
736 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 737 | * @net: the applicable net namespace |
1da177e4 LT |
738 | * @ifindex: index of device |
739 | * | |
740 | * Search for an interface by index. Returns %NULL if the device | |
741 | * is not found or a pointer to the device. The device has not | |
742 | * had its reference counter increased so the caller must be careful | |
743 | * about locking. The caller must hold either the RTNL semaphore | |
744 | * or @dev_base_lock. | |
745 | */ | |
746 | ||
881d966b | 747 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 748 | { |
0bd8d536 ED |
749 | struct net_device *dev; |
750 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 751 | |
b67bfe0d | 752 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
753 | if (dev->ifindex == ifindex) |
754 | return dev; | |
0bd8d536 | 755 | |
1da177e4 LT |
756 | return NULL; |
757 | } | |
d1b19dff | 758 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 759 | |
fb699dfd ED |
760 | /** |
761 | * dev_get_by_index_rcu - find a device by its ifindex | |
762 | * @net: the applicable net namespace | |
763 | * @ifindex: index of device | |
764 | * | |
765 | * Search for an interface by index. Returns %NULL if the device | |
766 | * is not found or a pointer to the device. The device has not | |
767 | * had its reference counter increased so the caller must be careful | |
768 | * about locking. The caller must hold RCU lock. | |
769 | */ | |
770 | ||
771 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
772 | { | |
fb699dfd ED |
773 | struct net_device *dev; |
774 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
775 | ||
b67bfe0d | 776 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
777 | if (dev->ifindex == ifindex) |
778 | return dev; | |
779 | ||
780 | return NULL; | |
781 | } | |
782 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
783 | ||
1da177e4 LT |
784 | |
785 | /** | |
786 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 787 | * @net: the applicable net namespace |
1da177e4 LT |
788 | * @ifindex: index of device |
789 | * | |
790 | * Search for an interface by index. Returns NULL if the device | |
791 | * is not found or a pointer to the device. The device returned has | |
792 | * had a reference added and the pointer is safe until the user calls | |
793 | * dev_put to indicate they have finished with it. | |
794 | */ | |
795 | ||
881d966b | 796 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
797 | { |
798 | struct net_device *dev; | |
799 | ||
fb699dfd ED |
800 | rcu_read_lock(); |
801 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
802 | if (dev) |
803 | dev_hold(dev); | |
fb699dfd | 804 | rcu_read_unlock(); |
1da177e4 LT |
805 | return dev; |
806 | } | |
d1b19dff | 807 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 808 | |
5dbe7c17 NS |
809 | /** |
810 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
811 | * @net: network namespace | |
812 | * @name: a pointer to the buffer where the name will be stored. | |
813 | * @ifindex: the ifindex of the interface to get the name from. | |
814 | * | |
815 | * The use of raw_seqcount_begin() and cond_resched() before | |
816 | * retrying is required as we want to give the writers a chance | |
817 | * to complete when CONFIG_PREEMPT is not set. | |
818 | */ | |
819 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
820 | { | |
821 | struct net_device *dev; | |
822 | unsigned int seq; | |
823 | ||
824 | retry: | |
825 | seq = raw_seqcount_begin(&devnet_rename_seq); | |
826 | rcu_read_lock(); | |
827 | dev = dev_get_by_index_rcu(net, ifindex); | |
828 | if (!dev) { | |
829 | rcu_read_unlock(); | |
830 | return -ENODEV; | |
831 | } | |
832 | ||
833 | strcpy(name, dev->name); | |
834 | rcu_read_unlock(); | |
835 | if (read_seqcount_retry(&devnet_rename_seq, seq)) { | |
836 | cond_resched(); | |
837 | goto retry; | |
838 | } | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
1da177e4 | 843 | /** |
941666c2 | 844 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 845 | * @net: the applicable net namespace |
1da177e4 LT |
846 | * @type: media type of device |
847 | * @ha: hardware address | |
848 | * | |
849 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
850 | * is not found or a pointer to the device. |
851 | * The caller must hold RCU or RTNL. | |
941666c2 | 852 | * The returned device has not had its ref count increased |
1da177e4 LT |
853 | * and the caller must therefore be careful about locking |
854 | * | |
1da177e4 LT |
855 | */ |
856 | ||
941666c2 ED |
857 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
858 | const char *ha) | |
1da177e4 LT |
859 | { |
860 | struct net_device *dev; | |
861 | ||
941666c2 | 862 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
863 | if (dev->type == type && |
864 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
865 | return dev; |
866 | ||
867 | return NULL; | |
1da177e4 | 868 | } |
941666c2 | 869 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 870 | |
881d966b | 871 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
872 | { |
873 | struct net_device *dev; | |
874 | ||
4e9cac2b | 875 | ASSERT_RTNL(); |
881d966b | 876 | for_each_netdev(net, dev) |
4e9cac2b | 877 | if (dev->type == type) |
7562f876 PE |
878 | return dev; |
879 | ||
880 | return NULL; | |
4e9cac2b | 881 | } |
4e9cac2b PM |
882 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
883 | ||
881d966b | 884 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 885 | { |
99fe3c39 | 886 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 887 | |
99fe3c39 ED |
888 | rcu_read_lock(); |
889 | for_each_netdev_rcu(net, dev) | |
890 | if (dev->type == type) { | |
891 | dev_hold(dev); | |
892 | ret = dev; | |
893 | break; | |
894 | } | |
895 | rcu_read_unlock(); | |
896 | return ret; | |
1da177e4 | 897 | } |
1da177e4 LT |
898 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
899 | ||
900 | /** | |
6c555490 | 901 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 902 | * @net: the applicable net namespace |
1da177e4 LT |
903 | * @if_flags: IFF_* values |
904 | * @mask: bitmask of bits in if_flags to check | |
905 | * | |
906 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 907 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 908 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
909 | */ |
910 | ||
6c555490 WC |
911 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
912 | unsigned short mask) | |
1da177e4 | 913 | { |
7562f876 | 914 | struct net_device *dev, *ret; |
1da177e4 | 915 | |
6c555490 WC |
916 | ASSERT_RTNL(); |
917 | ||
7562f876 | 918 | ret = NULL; |
6c555490 | 919 | for_each_netdev(net, dev) { |
1da177e4 | 920 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 921 | ret = dev; |
1da177e4 LT |
922 | break; |
923 | } | |
924 | } | |
7562f876 | 925 | return ret; |
1da177e4 | 926 | } |
6c555490 | 927 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
928 | |
929 | /** | |
930 | * dev_valid_name - check if name is okay for network device | |
931 | * @name: name string | |
932 | * | |
933 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
934 | * to allow sysfs to work. We also disallow any kind of |
935 | * whitespace. | |
1da177e4 | 936 | */ |
95f050bf | 937 | bool dev_valid_name(const char *name) |
1da177e4 | 938 | { |
c7fa9d18 | 939 | if (*name == '\0') |
95f050bf | 940 | return false; |
b6fe17d6 | 941 | if (strlen(name) >= IFNAMSIZ) |
95f050bf | 942 | return false; |
c7fa9d18 | 943 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 944 | return false; |
c7fa9d18 DM |
945 | |
946 | while (*name) { | |
947 | if (*name == '/' || isspace(*name)) | |
95f050bf | 948 | return false; |
c7fa9d18 DM |
949 | name++; |
950 | } | |
95f050bf | 951 | return true; |
1da177e4 | 952 | } |
d1b19dff | 953 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
954 | |
955 | /** | |
b267b179 EB |
956 | * __dev_alloc_name - allocate a name for a device |
957 | * @net: network namespace to allocate the device name in | |
1da177e4 | 958 | * @name: name format string |
b267b179 | 959 | * @buf: scratch buffer and result name string |
1da177e4 LT |
960 | * |
961 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
962 | * id. It scans list of devices to build up a free map, then chooses |
963 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
964 | * while allocating the name and adding the device in order to avoid | |
965 | * duplicates. | |
966 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
967 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
968 | */ |
969 | ||
b267b179 | 970 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
971 | { |
972 | int i = 0; | |
1da177e4 LT |
973 | const char *p; |
974 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 975 | unsigned long *inuse; |
1da177e4 LT |
976 | struct net_device *d; |
977 | ||
978 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
979 | if (p) { | |
980 | /* | |
981 | * Verify the string as this thing may have come from | |
982 | * the user. There must be either one "%d" and no other "%" | |
983 | * characters. | |
984 | */ | |
985 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
986 | return -EINVAL; | |
987 | ||
988 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 989 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
990 | if (!inuse) |
991 | return -ENOMEM; | |
992 | ||
881d966b | 993 | for_each_netdev(net, d) { |
1da177e4 LT |
994 | if (!sscanf(d->name, name, &i)) |
995 | continue; | |
996 | if (i < 0 || i >= max_netdevices) | |
997 | continue; | |
998 | ||
999 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 1000 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
1001 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
1002 | set_bit(i, inuse); | |
1003 | } | |
1004 | ||
1005 | i = find_first_zero_bit(inuse, max_netdevices); | |
1006 | free_page((unsigned long) inuse); | |
1007 | } | |
1008 | ||
d9031024 OP |
1009 | if (buf != name) |
1010 | snprintf(buf, IFNAMSIZ, name, i); | |
b267b179 | 1011 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1012 | return i; |
1da177e4 LT |
1013 | |
1014 | /* It is possible to run out of possible slots | |
1015 | * when the name is long and there isn't enough space left | |
1016 | * for the digits, or if all bits are used. | |
1017 | */ | |
1018 | return -ENFILE; | |
1019 | } | |
1020 | ||
b267b179 EB |
1021 | /** |
1022 | * dev_alloc_name - allocate a name for a device | |
1023 | * @dev: device | |
1024 | * @name: name format string | |
1025 | * | |
1026 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1027 | * id. It scans list of devices to build up a free map, then chooses | |
1028 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1029 | * while allocating the name and adding the device in order to avoid | |
1030 | * duplicates. | |
1031 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1032 | * Returns the number of the unit assigned or a negative errno code. | |
1033 | */ | |
1034 | ||
1035 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1036 | { | |
1037 | char buf[IFNAMSIZ]; | |
1038 | struct net *net; | |
1039 | int ret; | |
1040 | ||
c346dca1 YH |
1041 | BUG_ON(!dev_net(dev)); |
1042 | net = dev_net(dev); | |
b267b179 EB |
1043 | ret = __dev_alloc_name(net, name, buf); |
1044 | if (ret >= 0) | |
1045 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1046 | return ret; | |
1047 | } | |
d1b19dff | 1048 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1049 | |
828de4f6 G |
1050 | static int dev_alloc_name_ns(struct net *net, |
1051 | struct net_device *dev, | |
1052 | const char *name) | |
d9031024 | 1053 | { |
828de4f6 G |
1054 | char buf[IFNAMSIZ]; |
1055 | int ret; | |
8ce6cebc | 1056 | |
828de4f6 G |
1057 | ret = __dev_alloc_name(net, name, buf); |
1058 | if (ret >= 0) | |
1059 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1060 | return ret; | |
1061 | } | |
1062 | ||
1063 | static int dev_get_valid_name(struct net *net, | |
1064 | struct net_device *dev, | |
1065 | const char *name) | |
1066 | { | |
1067 | BUG_ON(!net); | |
8ce6cebc | 1068 | |
d9031024 OP |
1069 | if (!dev_valid_name(name)) |
1070 | return -EINVAL; | |
1071 | ||
1c5cae81 | 1072 | if (strchr(name, '%')) |
828de4f6 | 1073 | return dev_alloc_name_ns(net, dev, name); |
d9031024 OP |
1074 | else if (__dev_get_by_name(net, name)) |
1075 | return -EEXIST; | |
8ce6cebc DL |
1076 | else if (dev->name != name) |
1077 | strlcpy(dev->name, name, IFNAMSIZ); | |
d9031024 OP |
1078 | |
1079 | return 0; | |
1080 | } | |
1da177e4 LT |
1081 | |
1082 | /** | |
1083 | * dev_change_name - change name of a device | |
1084 | * @dev: device | |
1085 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1086 | * | |
1087 | * Change name of a device, can pass format strings "eth%d". | |
1088 | * for wildcarding. | |
1089 | */ | |
cf04a4c7 | 1090 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1091 | { |
238fa362 | 1092 | unsigned char old_assign_type; |
fcc5a03a | 1093 | char oldname[IFNAMSIZ]; |
1da177e4 | 1094 | int err = 0; |
fcc5a03a | 1095 | int ret; |
881d966b | 1096 | struct net *net; |
1da177e4 LT |
1097 | |
1098 | ASSERT_RTNL(); | |
c346dca1 | 1099 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1100 | |
c346dca1 | 1101 | net = dev_net(dev); |
1da177e4 LT |
1102 | if (dev->flags & IFF_UP) |
1103 | return -EBUSY; | |
1104 | ||
30e6c9fa | 1105 | write_seqcount_begin(&devnet_rename_seq); |
c91f6df2 BH |
1106 | |
1107 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
30e6c9fa | 1108 | write_seqcount_end(&devnet_rename_seq); |
c8d90dca | 1109 | return 0; |
c91f6df2 | 1110 | } |
c8d90dca | 1111 | |
fcc5a03a HX |
1112 | memcpy(oldname, dev->name, IFNAMSIZ); |
1113 | ||
828de4f6 | 1114 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1115 | if (err < 0) { |
30e6c9fa | 1116 | write_seqcount_end(&devnet_rename_seq); |
d9031024 | 1117 | return err; |
c91f6df2 | 1118 | } |
1da177e4 | 1119 | |
6fe82a39 VF |
1120 | if (oldname[0] && !strchr(oldname, '%')) |
1121 | netdev_info(dev, "renamed from %s\n", oldname); | |
1122 | ||
238fa362 TG |
1123 | old_assign_type = dev->name_assign_type; |
1124 | dev->name_assign_type = NET_NAME_RENAMED; | |
1125 | ||
fcc5a03a | 1126 | rollback: |
a1b3f594 EB |
1127 | ret = device_rename(&dev->dev, dev->name); |
1128 | if (ret) { | |
1129 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1130 | dev->name_assign_type = old_assign_type; |
30e6c9fa | 1131 | write_seqcount_end(&devnet_rename_seq); |
a1b3f594 | 1132 | return ret; |
dcc99773 | 1133 | } |
7f988eab | 1134 | |
30e6c9fa | 1135 | write_seqcount_end(&devnet_rename_seq); |
c91f6df2 | 1136 | |
5bb025fa VF |
1137 | netdev_adjacent_rename_links(dev, oldname); |
1138 | ||
7f988eab | 1139 | write_lock_bh(&dev_base_lock); |
372b2312 | 1140 | hlist_del_rcu(&dev->name_hlist); |
72c9528b ED |
1141 | write_unlock_bh(&dev_base_lock); |
1142 | ||
1143 | synchronize_rcu(); | |
1144 | ||
1145 | write_lock_bh(&dev_base_lock); | |
1146 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1147 | write_unlock_bh(&dev_base_lock); |
1148 | ||
056925ab | 1149 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1150 | ret = notifier_to_errno(ret); |
1151 | ||
1152 | if (ret) { | |
91e9c07b ED |
1153 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1154 | if (err >= 0) { | |
fcc5a03a | 1155 | err = ret; |
30e6c9fa | 1156 | write_seqcount_begin(&devnet_rename_seq); |
fcc5a03a | 1157 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1158 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1159 | dev->name_assign_type = old_assign_type; |
1160 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1161 | goto rollback; |
91e9c07b | 1162 | } else { |
7b6cd1ce | 1163 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1164 | dev->name, ret); |
fcc5a03a HX |
1165 | } |
1166 | } | |
1da177e4 LT |
1167 | |
1168 | return err; | |
1169 | } | |
1170 | ||
0b815a1a SH |
1171 | /** |
1172 | * dev_set_alias - change ifalias of a device | |
1173 | * @dev: device | |
1174 | * @alias: name up to IFALIASZ | |
f0db275a | 1175 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1176 | * |
1177 | * Set ifalias for a device, | |
1178 | */ | |
1179 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1180 | { | |
7364e445 AK |
1181 | char *new_ifalias; |
1182 | ||
0b815a1a SH |
1183 | ASSERT_RTNL(); |
1184 | ||
1185 | if (len >= IFALIASZ) | |
1186 | return -EINVAL; | |
1187 | ||
96ca4a2c | 1188 | if (!len) { |
388dfc2d SK |
1189 | kfree(dev->ifalias); |
1190 | dev->ifalias = NULL; | |
96ca4a2c OH |
1191 | return 0; |
1192 | } | |
1193 | ||
7364e445 AK |
1194 | new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
1195 | if (!new_ifalias) | |
0b815a1a | 1196 | return -ENOMEM; |
7364e445 | 1197 | dev->ifalias = new_ifalias; |
0b815a1a SH |
1198 | |
1199 | strlcpy(dev->ifalias, alias, len+1); | |
1200 | return len; | |
1201 | } | |
1202 | ||
1203 | ||
d8a33ac4 | 1204 | /** |
3041a069 | 1205 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1206 | * @dev: device to cause notification |
1207 | * | |
1208 | * Called to indicate a device has changed features. | |
1209 | */ | |
1210 | void netdev_features_change(struct net_device *dev) | |
1211 | { | |
056925ab | 1212 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1213 | } |
1214 | EXPORT_SYMBOL(netdev_features_change); | |
1215 | ||
1da177e4 LT |
1216 | /** |
1217 | * netdev_state_change - device changes state | |
1218 | * @dev: device to cause notification | |
1219 | * | |
1220 | * Called to indicate a device has changed state. This function calls | |
1221 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1222 | * to the routing socket. | |
1223 | */ | |
1224 | void netdev_state_change(struct net_device *dev) | |
1225 | { | |
1226 | if (dev->flags & IFF_UP) { | |
54951194 LP |
1227 | struct netdev_notifier_change_info change_info; |
1228 | ||
1229 | change_info.flags_changed = 0; | |
1230 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
1231 | &change_info.info); | |
7f294054 | 1232 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1233 | } |
1234 | } | |
d1b19dff | 1235 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1236 | |
ee89bab1 AW |
1237 | /** |
1238 | * netdev_notify_peers - notify network peers about existence of @dev | |
1239 | * @dev: network device | |
1240 | * | |
1241 | * Generate traffic such that interested network peers are aware of | |
1242 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1243 | * a device wants to inform the rest of the network about some sort of | |
1244 | * reconfiguration such as a failover event or virtual machine | |
1245 | * migration. | |
1246 | */ | |
1247 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1248 | { |
ee89bab1 AW |
1249 | rtnl_lock(); |
1250 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
1251 | rtnl_unlock(); | |
c1da4ac7 | 1252 | } |
ee89bab1 | 1253 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1254 | |
bd380811 | 1255 | static int __dev_open(struct net_device *dev) |
1da177e4 | 1256 | { |
d314774c | 1257 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1258 | int ret; |
1da177e4 | 1259 | |
e46b66bc BH |
1260 | ASSERT_RTNL(); |
1261 | ||
1da177e4 LT |
1262 | if (!netif_device_present(dev)) |
1263 | return -ENODEV; | |
1264 | ||
ca99ca14 NH |
1265 | /* Block netpoll from trying to do any rx path servicing. |
1266 | * If we don't do this there is a chance ndo_poll_controller | |
1267 | * or ndo_poll may be running while we open the device | |
1268 | */ | |
66b5552f | 1269 | netpoll_poll_disable(dev); |
ca99ca14 | 1270 | |
3b8bcfd5 JB |
1271 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1272 | ret = notifier_to_errno(ret); | |
1273 | if (ret) | |
1274 | return ret; | |
1275 | ||
1da177e4 | 1276 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1277 | |
d314774c SH |
1278 | if (ops->ndo_validate_addr) |
1279 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1280 | |
d314774c SH |
1281 | if (!ret && ops->ndo_open) |
1282 | ret = ops->ndo_open(dev); | |
1da177e4 | 1283 | |
66b5552f | 1284 | netpoll_poll_enable(dev); |
ca99ca14 | 1285 | |
bada339b JG |
1286 | if (ret) |
1287 | clear_bit(__LINK_STATE_START, &dev->state); | |
1288 | else { | |
1da177e4 | 1289 | dev->flags |= IFF_UP; |
4417da66 | 1290 | dev_set_rx_mode(dev); |
1da177e4 | 1291 | dev_activate(dev); |
7bf23575 | 1292 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1293 | } |
bada339b | 1294 | |
1da177e4 LT |
1295 | return ret; |
1296 | } | |
1297 | ||
1298 | /** | |
bd380811 PM |
1299 | * dev_open - prepare an interface for use. |
1300 | * @dev: device to open | |
1da177e4 | 1301 | * |
bd380811 PM |
1302 | * Takes a device from down to up state. The device's private open |
1303 | * function is invoked and then the multicast lists are loaded. Finally | |
1304 | * the device is moved into the up state and a %NETDEV_UP message is | |
1305 | * sent to the netdev notifier chain. | |
1306 | * | |
1307 | * Calling this function on an active interface is a nop. On a failure | |
1308 | * a negative errno code is returned. | |
1da177e4 | 1309 | */ |
bd380811 PM |
1310 | int dev_open(struct net_device *dev) |
1311 | { | |
1312 | int ret; | |
1313 | ||
bd380811 PM |
1314 | if (dev->flags & IFF_UP) |
1315 | return 0; | |
1316 | ||
bd380811 PM |
1317 | ret = __dev_open(dev); |
1318 | if (ret < 0) | |
1319 | return ret; | |
1320 | ||
7f294054 | 1321 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1322 | call_netdevice_notifiers(NETDEV_UP, dev); |
1323 | ||
1324 | return ret; | |
1325 | } | |
1326 | EXPORT_SYMBOL(dev_open); | |
1327 | ||
44345724 | 1328 | static int __dev_close_many(struct list_head *head) |
1da177e4 | 1329 | { |
44345724 | 1330 | struct net_device *dev; |
e46b66bc | 1331 | |
bd380811 | 1332 | ASSERT_RTNL(); |
9d5010db DM |
1333 | might_sleep(); |
1334 | ||
5cde2829 | 1335 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1336 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1337 | netpoll_poll_disable(dev); |
3f4df206 | 1338 | |
44345724 | 1339 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1340 | |
44345724 | 1341 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1342 | |
44345724 OP |
1343 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1344 | * can be even on different cpu. So just clear netif_running(). | |
1345 | * | |
1346 | * dev->stop() will invoke napi_disable() on all of it's | |
1347 | * napi_struct instances on this device. | |
1348 | */ | |
4e857c58 | 1349 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1350 | } |
1da177e4 | 1351 | |
44345724 | 1352 | dev_deactivate_many(head); |
d8b2a4d2 | 1353 | |
5cde2829 | 1354 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1355 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1356 | |
44345724 OP |
1357 | /* |
1358 | * Call the device specific close. This cannot fail. | |
1359 | * Only if device is UP | |
1360 | * | |
1361 | * We allow it to be called even after a DETACH hot-plug | |
1362 | * event. | |
1363 | */ | |
1364 | if (ops->ndo_stop) | |
1365 | ops->ndo_stop(dev); | |
1366 | ||
44345724 | 1367 | dev->flags &= ~IFF_UP; |
66b5552f | 1368 | netpoll_poll_enable(dev); |
44345724 OP |
1369 | } |
1370 | ||
1371 | return 0; | |
1372 | } | |
1373 | ||
1374 | static int __dev_close(struct net_device *dev) | |
1375 | { | |
f87e6f47 | 1376 | int retval; |
44345724 OP |
1377 | LIST_HEAD(single); |
1378 | ||
5cde2829 | 1379 | list_add(&dev->close_list, &single); |
f87e6f47 LT |
1380 | retval = __dev_close_many(&single); |
1381 | list_del(&single); | |
ca99ca14 | 1382 | |
f87e6f47 | 1383 | return retval; |
44345724 OP |
1384 | } |
1385 | ||
3fbd8758 | 1386 | static int dev_close_many(struct list_head *head) |
44345724 OP |
1387 | { |
1388 | struct net_device *dev, *tmp; | |
1da177e4 | 1389 | |
5cde2829 EB |
1390 | /* Remove the devices that don't need to be closed */ |
1391 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1392 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1393 | list_del_init(&dev->close_list); |
44345724 OP |
1394 | |
1395 | __dev_close_many(head); | |
1da177e4 | 1396 | |
5cde2829 | 1397 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1398 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1399 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
5cde2829 | 1400 | list_del_init(&dev->close_list); |
44345724 | 1401 | } |
bd380811 PM |
1402 | |
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | /** | |
1407 | * dev_close - shutdown an interface. | |
1408 | * @dev: device to shutdown | |
1409 | * | |
1410 | * This function moves an active device into down state. A | |
1411 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1412 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1413 | * chain. | |
1414 | */ | |
1415 | int dev_close(struct net_device *dev) | |
1416 | { | |
e14a5993 ED |
1417 | if (dev->flags & IFF_UP) { |
1418 | LIST_HEAD(single); | |
1da177e4 | 1419 | |
5cde2829 | 1420 | list_add(&dev->close_list, &single); |
e14a5993 ED |
1421 | dev_close_many(&single); |
1422 | list_del(&single); | |
1423 | } | |
da6e378b | 1424 | return 0; |
1da177e4 | 1425 | } |
d1b19dff | 1426 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1427 | |
1428 | ||
0187bdfb BH |
1429 | /** |
1430 | * dev_disable_lro - disable Large Receive Offload on a device | |
1431 | * @dev: device | |
1432 | * | |
1433 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1434 | * called under RTNL. This is needed if received packets may be | |
1435 | * forwarded to another interface. | |
1436 | */ | |
1437 | void dev_disable_lro(struct net_device *dev) | |
1438 | { | |
f11970e3 NH |
1439 | /* |
1440 | * If we're trying to disable lro on a vlan device | |
1441 | * use the underlying physical device instead | |
1442 | */ | |
1443 | if (is_vlan_dev(dev)) | |
1444 | dev = vlan_dev_real_dev(dev); | |
1445 | ||
529d0489 MK |
1446 | /* the same for macvlan devices */ |
1447 | if (netif_is_macvlan(dev)) | |
1448 | dev = macvlan_dev_real_dev(dev); | |
1449 | ||
bc5787c6 MM |
1450 | dev->wanted_features &= ~NETIF_F_LRO; |
1451 | netdev_update_features(dev); | |
27660515 | 1452 | |
22d5969f MM |
1453 | if (unlikely(dev->features & NETIF_F_LRO)) |
1454 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
0187bdfb BH |
1455 | } |
1456 | EXPORT_SYMBOL(dev_disable_lro); | |
1457 | ||
351638e7 JP |
1458 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1459 | struct net_device *dev) | |
1460 | { | |
1461 | struct netdev_notifier_info info; | |
1462 | ||
1463 | netdev_notifier_info_init(&info, dev); | |
1464 | return nb->notifier_call(nb, val, &info); | |
1465 | } | |
0187bdfb | 1466 | |
881d966b EB |
1467 | static int dev_boot_phase = 1; |
1468 | ||
1da177e4 LT |
1469 | /** |
1470 | * register_netdevice_notifier - register a network notifier block | |
1471 | * @nb: notifier | |
1472 | * | |
1473 | * Register a notifier to be called when network device events occur. | |
1474 | * The notifier passed is linked into the kernel structures and must | |
1475 | * not be reused until it has been unregistered. A negative errno code | |
1476 | * is returned on a failure. | |
1477 | * | |
1478 | * When registered all registration and up events are replayed | |
4ec93edb | 1479 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1480 | * view of the network device list. |
1481 | */ | |
1482 | ||
1483 | int register_netdevice_notifier(struct notifier_block *nb) | |
1484 | { | |
1485 | struct net_device *dev; | |
fcc5a03a | 1486 | struct net_device *last; |
881d966b | 1487 | struct net *net; |
1da177e4 LT |
1488 | int err; |
1489 | ||
1490 | rtnl_lock(); | |
f07d5b94 | 1491 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1492 | if (err) |
1493 | goto unlock; | |
881d966b EB |
1494 | if (dev_boot_phase) |
1495 | goto unlock; | |
1496 | for_each_net(net) { | |
1497 | for_each_netdev(net, dev) { | |
351638e7 | 1498 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
881d966b EB |
1499 | err = notifier_to_errno(err); |
1500 | if (err) | |
1501 | goto rollback; | |
1502 | ||
1503 | if (!(dev->flags & IFF_UP)) | |
1504 | continue; | |
1da177e4 | 1505 | |
351638e7 | 1506 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
881d966b | 1507 | } |
1da177e4 | 1508 | } |
fcc5a03a HX |
1509 | |
1510 | unlock: | |
1da177e4 LT |
1511 | rtnl_unlock(); |
1512 | return err; | |
fcc5a03a HX |
1513 | |
1514 | rollback: | |
1515 | last = dev; | |
881d966b EB |
1516 | for_each_net(net) { |
1517 | for_each_netdev(net, dev) { | |
1518 | if (dev == last) | |
8f891489 | 1519 | goto outroll; |
fcc5a03a | 1520 | |
881d966b | 1521 | if (dev->flags & IFF_UP) { |
351638e7 JP |
1522 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1523 | dev); | |
1524 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
881d966b | 1525 | } |
351638e7 | 1526 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
fcc5a03a | 1527 | } |
fcc5a03a | 1528 | } |
c67625a1 | 1529 | |
8f891489 | 1530 | outroll: |
c67625a1 | 1531 | raw_notifier_chain_unregister(&netdev_chain, nb); |
fcc5a03a | 1532 | goto unlock; |
1da177e4 | 1533 | } |
d1b19dff | 1534 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1535 | |
1536 | /** | |
1537 | * unregister_netdevice_notifier - unregister a network notifier block | |
1538 | * @nb: notifier | |
1539 | * | |
1540 | * Unregister a notifier previously registered by | |
1541 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1542 | * kernel structures and may then be reused. A negative errno code | |
1543 | * is returned on a failure. | |
7d3d43da EB |
1544 | * |
1545 | * After unregistering unregister and down device events are synthesized | |
1546 | * for all devices on the device list to the removed notifier to remove | |
1547 | * the need for special case cleanup code. | |
1da177e4 LT |
1548 | */ |
1549 | ||
1550 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1551 | { | |
7d3d43da EB |
1552 | struct net_device *dev; |
1553 | struct net *net; | |
9f514950 HX |
1554 | int err; |
1555 | ||
1556 | rtnl_lock(); | |
f07d5b94 | 1557 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1558 | if (err) |
1559 | goto unlock; | |
1560 | ||
1561 | for_each_net(net) { | |
1562 | for_each_netdev(net, dev) { | |
1563 | if (dev->flags & IFF_UP) { | |
351638e7 JP |
1564 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1565 | dev); | |
1566 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
7d3d43da | 1567 | } |
351638e7 | 1568 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
7d3d43da EB |
1569 | } |
1570 | } | |
1571 | unlock: | |
9f514950 HX |
1572 | rtnl_unlock(); |
1573 | return err; | |
1da177e4 | 1574 | } |
d1b19dff | 1575 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1576 | |
351638e7 JP |
1577 | /** |
1578 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1579 | * @val: value passed unmodified to notifier function | |
1580 | * @dev: net_device pointer passed unmodified to notifier function | |
1581 | * @info: notifier information data | |
1582 | * | |
1583 | * Call all network notifier blocks. Parameters and return value | |
1584 | * are as for raw_notifier_call_chain(). | |
1585 | */ | |
1586 | ||
1d143d9f | 1587 | static int call_netdevice_notifiers_info(unsigned long val, |
1588 | struct net_device *dev, | |
1589 | struct netdev_notifier_info *info) | |
351638e7 JP |
1590 | { |
1591 | ASSERT_RTNL(); | |
1592 | netdev_notifier_info_init(info, dev); | |
1593 | return raw_notifier_call_chain(&netdev_chain, val, info); | |
1594 | } | |
351638e7 | 1595 | |
1da177e4 LT |
1596 | /** |
1597 | * call_netdevice_notifiers - call all network notifier blocks | |
1598 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1599 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1600 | * |
1601 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1602 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1603 | */ |
1604 | ||
ad7379d4 | 1605 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1606 | { |
351638e7 JP |
1607 | struct netdev_notifier_info info; |
1608 | ||
1609 | return call_netdevice_notifiers_info(val, dev, &info); | |
1da177e4 | 1610 | } |
edf947f1 | 1611 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 1612 | |
c5905afb | 1613 | static struct static_key netstamp_needed __read_mostly; |
b90e5794 | 1614 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 1615 | /* We are not allowed to call static_key_slow_dec() from irq context |
b90e5794 | 1616 | * If net_disable_timestamp() is called from irq context, defer the |
c5905afb | 1617 | * static_key_slow_dec() calls. |
b90e5794 ED |
1618 | */ |
1619 | static atomic_t netstamp_needed_deferred; | |
1620 | #endif | |
1da177e4 LT |
1621 | |
1622 | void net_enable_timestamp(void) | |
1623 | { | |
b90e5794 ED |
1624 | #ifdef HAVE_JUMP_LABEL |
1625 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); | |
1626 | ||
1627 | if (deferred) { | |
1628 | while (--deferred) | |
c5905afb | 1629 | static_key_slow_dec(&netstamp_needed); |
b90e5794 ED |
1630 | return; |
1631 | } | |
1632 | #endif | |
c5905afb | 1633 | static_key_slow_inc(&netstamp_needed); |
1da177e4 | 1634 | } |
d1b19dff | 1635 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1636 | |
1637 | void net_disable_timestamp(void) | |
1638 | { | |
b90e5794 ED |
1639 | #ifdef HAVE_JUMP_LABEL |
1640 | if (in_interrupt()) { | |
1641 | atomic_inc(&netstamp_needed_deferred); | |
1642 | return; | |
1643 | } | |
1644 | #endif | |
c5905afb | 1645 | static_key_slow_dec(&netstamp_needed); |
1da177e4 | 1646 | } |
d1b19dff | 1647 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1648 | |
3b098e2d | 1649 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 1650 | { |
588f0330 | 1651 | skb->tstamp.tv64 = 0; |
c5905afb | 1652 | if (static_key_false(&netstamp_needed)) |
a61bbcf2 | 1653 | __net_timestamp(skb); |
1da177e4 LT |
1654 | } |
1655 | ||
588f0330 | 1656 | #define net_timestamp_check(COND, SKB) \ |
c5905afb | 1657 | if (static_key_false(&netstamp_needed)) { \ |
588f0330 ED |
1658 | if ((COND) && !(SKB)->tstamp.tv64) \ |
1659 | __net_timestamp(SKB); \ | |
1660 | } \ | |
3b098e2d | 1661 | |
1ee481fb | 1662 | bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb) |
79b569f0 DL |
1663 | { |
1664 | unsigned int len; | |
1665 | ||
1666 | if (!(dev->flags & IFF_UP)) | |
1667 | return false; | |
1668 | ||
1669 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
1670 | if (skb->len <= len) | |
1671 | return true; | |
1672 | ||
1673 | /* if TSO is enabled, we don't care about the length as the packet | |
1674 | * could be forwarded without being segmented before | |
1675 | */ | |
1676 | if (skb_is_gso(skb)) | |
1677 | return true; | |
1678 | ||
1679 | return false; | |
1680 | } | |
1ee481fb | 1681 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 1682 | |
a0265d28 HX |
1683 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
1684 | { | |
1685 | if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { | |
1686 | if (skb_copy_ubufs(skb, GFP_ATOMIC)) { | |
1687 | atomic_long_inc(&dev->rx_dropped); | |
1688 | kfree_skb(skb); | |
1689 | return NET_RX_DROP; | |
1690 | } | |
1691 | } | |
1692 | ||
1693 | if (unlikely(!is_skb_forwardable(dev, skb))) { | |
1694 | atomic_long_inc(&dev->rx_dropped); | |
1695 | kfree_skb(skb); | |
1696 | return NET_RX_DROP; | |
1697 | } | |
1698 | ||
1699 | skb_scrub_packet(skb, true); | |
1700 | skb->protocol = eth_type_trans(skb, dev); | |
1701 | ||
1702 | return 0; | |
1703 | } | |
1704 | EXPORT_SYMBOL_GPL(__dev_forward_skb); | |
1705 | ||
44540960 AB |
1706 | /** |
1707 | * dev_forward_skb - loopback an skb to another netif | |
1708 | * | |
1709 | * @dev: destination network device | |
1710 | * @skb: buffer to forward | |
1711 | * | |
1712 | * return values: | |
1713 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1714 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1715 | * |
1716 | * dev_forward_skb can be used for injecting an skb from the | |
1717 | * start_xmit function of one device into the receive queue | |
1718 | * of another device. | |
1719 | * | |
1720 | * The receiving device may be in another namespace, so | |
1721 | * we have to clear all information in the skb that could | |
1722 | * impact namespace isolation. | |
1723 | */ | |
1724 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1725 | { | |
a0265d28 | 1726 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
1727 | } |
1728 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1729 | ||
71d9dec2 CG |
1730 | static inline int deliver_skb(struct sk_buff *skb, |
1731 | struct packet_type *pt_prev, | |
1732 | struct net_device *orig_dev) | |
1733 | { | |
1080e512 MT |
1734 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
1735 | return -ENOMEM; | |
71d9dec2 CG |
1736 | atomic_inc(&skb->users); |
1737 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1738 | } | |
1739 | ||
c0de08d0 EL |
1740 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
1741 | { | |
a3d744e9 | 1742 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
1743 | return false; |
1744 | ||
1745 | if (ptype->id_match) | |
1746 | return ptype->id_match(ptype, skb->sk); | |
1747 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
1748 | return true; | |
1749 | ||
1750 | return false; | |
1751 | } | |
1752 | ||
1da177e4 LT |
1753 | /* |
1754 | * Support routine. Sends outgoing frames to any network | |
1755 | * taps currently in use. | |
1756 | */ | |
1757 | ||
f6a78bfc | 1758 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1759 | { |
1760 | struct packet_type *ptype; | |
71d9dec2 CG |
1761 | struct sk_buff *skb2 = NULL; |
1762 | struct packet_type *pt_prev = NULL; | |
a61bbcf2 | 1763 | |
1da177e4 LT |
1764 | rcu_read_lock(); |
1765 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1766 | /* Never send packets back to the socket | |
1767 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1768 | */ | |
1769 | if ((ptype->dev == dev || !ptype->dev) && | |
c0de08d0 | 1770 | (!skb_loop_sk(ptype, skb))) { |
71d9dec2 CG |
1771 | if (pt_prev) { |
1772 | deliver_skb(skb2, pt_prev, skb->dev); | |
1773 | pt_prev = ptype; | |
1774 | continue; | |
1775 | } | |
1776 | ||
1777 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1da177e4 LT |
1778 | if (!skb2) |
1779 | break; | |
1780 | ||
70978182 ED |
1781 | net_timestamp_set(skb2); |
1782 | ||
1da177e4 LT |
1783 | /* skb->nh should be correctly |
1784 | set by sender, so that the second statement is | |
1785 | just protection against buggy protocols. | |
1786 | */ | |
459a98ed | 1787 | skb_reset_mac_header(skb2); |
1da177e4 | 1788 | |
d56f90a7 | 1789 | if (skb_network_header(skb2) < skb2->data || |
ced14f68 | 1790 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { |
e87cc472 JP |
1791 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", |
1792 | ntohs(skb2->protocol), | |
1793 | dev->name); | |
c1d2bbe1 | 1794 | skb_reset_network_header(skb2); |
1da177e4 LT |
1795 | } |
1796 | ||
b0e380b1 | 1797 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1798 | skb2->pkt_type = PACKET_OUTGOING; |
71d9dec2 | 1799 | pt_prev = ptype; |
1da177e4 LT |
1800 | } |
1801 | } | |
71d9dec2 CG |
1802 | if (pt_prev) |
1803 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
1da177e4 LT |
1804 | rcu_read_unlock(); |
1805 | } | |
1806 | ||
2c53040f BH |
1807 | /** |
1808 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
1809 | * @dev: Network device |
1810 | * @txq: number of queues available | |
1811 | * | |
1812 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
1813 | * valid. To resolve this verify the tc mapping remains valid and if | |
1814 | * not NULL the mapping. With no priorities mapping to this | |
1815 | * offset/count pair it will no longer be used. In the worst case TC0 | |
1816 | * is invalid nothing can be done so disable priority mappings. If is | |
1817 | * expected that drivers will fix this mapping if they can before | |
1818 | * calling netif_set_real_num_tx_queues. | |
1819 | */ | |
bb134d22 | 1820 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
1821 | { |
1822 | int i; | |
1823 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
1824 | ||
1825 | /* If TC0 is invalidated disable TC mapping */ | |
1826 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 1827 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
1828 | dev->num_tc = 0; |
1829 | return; | |
1830 | } | |
1831 | ||
1832 | /* Invalidated prio to tc mappings set to TC0 */ | |
1833 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
1834 | int q = netdev_get_prio_tc_map(dev, i); | |
1835 | ||
1836 | tc = &dev->tc_to_txq[q]; | |
1837 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
1838 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
1839 | i, q); | |
4f57c087 JF |
1840 | netdev_set_prio_tc_map(dev, i, 0); |
1841 | } | |
1842 | } | |
1843 | } | |
1844 | ||
537c00de AD |
1845 | #ifdef CONFIG_XPS |
1846 | static DEFINE_MUTEX(xps_map_mutex); | |
1847 | #define xmap_dereference(P) \ | |
1848 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
1849 | ||
10cdc3f3 AD |
1850 | static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps, |
1851 | int cpu, u16 index) | |
537c00de | 1852 | { |
10cdc3f3 AD |
1853 | struct xps_map *map = NULL; |
1854 | int pos; | |
537c00de | 1855 | |
10cdc3f3 AD |
1856 | if (dev_maps) |
1857 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
537c00de | 1858 | |
10cdc3f3 AD |
1859 | for (pos = 0; map && pos < map->len; pos++) { |
1860 | if (map->queues[pos] == index) { | |
537c00de AD |
1861 | if (map->len > 1) { |
1862 | map->queues[pos] = map->queues[--map->len]; | |
1863 | } else { | |
10cdc3f3 | 1864 | RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL); |
537c00de AD |
1865 | kfree_rcu(map, rcu); |
1866 | map = NULL; | |
1867 | } | |
10cdc3f3 | 1868 | break; |
537c00de | 1869 | } |
537c00de AD |
1870 | } |
1871 | ||
10cdc3f3 AD |
1872 | return map; |
1873 | } | |
1874 | ||
024e9679 | 1875 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
10cdc3f3 AD |
1876 | { |
1877 | struct xps_dev_maps *dev_maps; | |
024e9679 | 1878 | int cpu, i; |
10cdc3f3 AD |
1879 | bool active = false; |
1880 | ||
1881 | mutex_lock(&xps_map_mutex); | |
1882 | dev_maps = xmap_dereference(dev->xps_maps); | |
1883 | ||
1884 | if (!dev_maps) | |
1885 | goto out_no_maps; | |
1886 | ||
1887 | for_each_possible_cpu(cpu) { | |
024e9679 AD |
1888 | for (i = index; i < dev->num_tx_queues; i++) { |
1889 | if (!remove_xps_queue(dev_maps, cpu, i)) | |
1890 | break; | |
1891 | } | |
1892 | if (i == dev->num_tx_queues) | |
10cdc3f3 AD |
1893 | active = true; |
1894 | } | |
1895 | ||
1896 | if (!active) { | |
537c00de AD |
1897 | RCU_INIT_POINTER(dev->xps_maps, NULL); |
1898 | kfree_rcu(dev_maps, rcu); | |
1899 | } | |
1900 | ||
024e9679 AD |
1901 | for (i = index; i < dev->num_tx_queues; i++) |
1902 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i), | |
1903 | NUMA_NO_NODE); | |
1904 | ||
537c00de AD |
1905 | out_no_maps: |
1906 | mutex_unlock(&xps_map_mutex); | |
1907 | } | |
1908 | ||
01c5f864 AD |
1909 | static struct xps_map *expand_xps_map(struct xps_map *map, |
1910 | int cpu, u16 index) | |
1911 | { | |
1912 | struct xps_map *new_map; | |
1913 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
1914 | int i, pos; | |
1915 | ||
1916 | for (pos = 0; map && pos < map->len; pos++) { | |
1917 | if (map->queues[pos] != index) | |
1918 | continue; | |
1919 | return map; | |
1920 | } | |
1921 | ||
1922 | /* Need to add queue to this CPU's existing map */ | |
1923 | if (map) { | |
1924 | if (pos < map->alloc_len) | |
1925 | return map; | |
1926 | ||
1927 | alloc_len = map->alloc_len * 2; | |
1928 | } | |
1929 | ||
1930 | /* Need to allocate new map to store queue on this CPU's map */ | |
1931 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
1932 | cpu_to_node(cpu)); | |
1933 | if (!new_map) | |
1934 | return NULL; | |
1935 | ||
1936 | for (i = 0; i < pos; i++) | |
1937 | new_map->queues[i] = map->queues[i]; | |
1938 | new_map->alloc_len = alloc_len; | |
1939 | new_map->len = pos; | |
1940 | ||
1941 | return new_map; | |
1942 | } | |
1943 | ||
3573540c MT |
1944 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, |
1945 | u16 index) | |
537c00de | 1946 | { |
01c5f864 | 1947 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
537c00de | 1948 | struct xps_map *map, *new_map; |
537c00de | 1949 | int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES); |
01c5f864 AD |
1950 | int cpu, numa_node_id = -2; |
1951 | bool active = false; | |
537c00de AD |
1952 | |
1953 | mutex_lock(&xps_map_mutex); | |
1954 | ||
1955 | dev_maps = xmap_dereference(dev->xps_maps); | |
1956 | ||
01c5f864 AD |
1957 | /* allocate memory for queue storage */ |
1958 | for_each_online_cpu(cpu) { | |
1959 | if (!cpumask_test_cpu(cpu, mask)) | |
1960 | continue; | |
1961 | ||
1962 | if (!new_dev_maps) | |
1963 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
1964 | if (!new_dev_maps) { |
1965 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 1966 | return -ENOMEM; |
2bb60cb9 | 1967 | } |
01c5f864 AD |
1968 | |
1969 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
1970 | NULL; | |
1971 | ||
1972 | map = expand_xps_map(map, cpu, index); | |
1973 | if (!map) | |
1974 | goto error; | |
1975 | ||
1976 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
1977 | } | |
1978 | ||
1979 | if (!new_dev_maps) | |
1980 | goto out_no_new_maps; | |
1981 | ||
537c00de | 1982 | for_each_possible_cpu(cpu) { |
01c5f864 AD |
1983 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) { |
1984 | /* add queue to CPU maps */ | |
1985 | int pos = 0; | |
1986 | ||
1987 | map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
1988 | while ((pos < map->len) && (map->queues[pos] != index)) | |
1989 | pos++; | |
1990 | ||
1991 | if (pos == map->len) | |
1992 | map->queues[map->len++] = index; | |
537c00de | 1993 | #ifdef CONFIG_NUMA |
537c00de AD |
1994 | if (numa_node_id == -2) |
1995 | numa_node_id = cpu_to_node(cpu); | |
1996 | else if (numa_node_id != cpu_to_node(cpu)) | |
1997 | numa_node_id = -1; | |
537c00de | 1998 | #endif |
01c5f864 AD |
1999 | } else if (dev_maps) { |
2000 | /* fill in the new device map from the old device map */ | |
2001 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
2002 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
537c00de | 2003 | } |
01c5f864 | 2004 | |
537c00de AD |
2005 | } |
2006 | ||
01c5f864 AD |
2007 | rcu_assign_pointer(dev->xps_maps, new_dev_maps); |
2008 | ||
537c00de | 2009 | /* Cleanup old maps */ |
01c5f864 AD |
2010 | if (dev_maps) { |
2011 | for_each_possible_cpu(cpu) { | |
2012 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2013 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
2014 | if (map && map != new_map) | |
2015 | kfree_rcu(map, rcu); | |
2016 | } | |
537c00de | 2017 | |
01c5f864 | 2018 | kfree_rcu(dev_maps, rcu); |
537c00de AD |
2019 | } |
2020 | ||
01c5f864 AD |
2021 | dev_maps = new_dev_maps; |
2022 | active = true; | |
537c00de | 2023 | |
01c5f864 AD |
2024 | out_no_new_maps: |
2025 | /* update Tx queue numa node */ | |
537c00de AD |
2026 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), |
2027 | (numa_node_id >= 0) ? numa_node_id : | |
2028 | NUMA_NO_NODE); | |
2029 | ||
01c5f864 AD |
2030 | if (!dev_maps) |
2031 | goto out_no_maps; | |
2032 | ||
2033 | /* removes queue from unused CPUs */ | |
2034 | for_each_possible_cpu(cpu) { | |
2035 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) | |
2036 | continue; | |
2037 | ||
2038 | if (remove_xps_queue(dev_maps, cpu, index)) | |
2039 | active = true; | |
2040 | } | |
2041 | ||
2042 | /* free map if not active */ | |
2043 | if (!active) { | |
2044 | RCU_INIT_POINTER(dev->xps_maps, NULL); | |
2045 | kfree_rcu(dev_maps, rcu); | |
2046 | } | |
2047 | ||
2048 | out_no_maps: | |
537c00de AD |
2049 | mutex_unlock(&xps_map_mutex); |
2050 | ||
2051 | return 0; | |
2052 | error: | |
01c5f864 AD |
2053 | /* remove any maps that we added */ |
2054 | for_each_possible_cpu(cpu) { | |
2055 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2056 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
2057 | NULL; | |
2058 | if (new_map && new_map != map) | |
2059 | kfree(new_map); | |
2060 | } | |
2061 | ||
537c00de AD |
2062 | mutex_unlock(&xps_map_mutex); |
2063 | ||
537c00de AD |
2064 | kfree(new_dev_maps); |
2065 | return -ENOMEM; | |
2066 | } | |
2067 | EXPORT_SYMBOL(netif_set_xps_queue); | |
2068 | ||
2069 | #endif | |
f0796d5c JF |
2070 | /* |
2071 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
2072 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. | |
2073 | */ | |
e6484930 | 2074 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2075 | { |
1d24eb48 TH |
2076 | int rc; |
2077 | ||
e6484930 TH |
2078 | if (txq < 1 || txq > dev->num_tx_queues) |
2079 | return -EINVAL; | |
f0796d5c | 2080 | |
5c56580b BH |
2081 | if (dev->reg_state == NETREG_REGISTERED || |
2082 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2083 | ASSERT_RTNL(); |
2084 | ||
1d24eb48 TH |
2085 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2086 | txq); | |
bf264145 TH |
2087 | if (rc) |
2088 | return rc; | |
2089 | ||
4f57c087 JF |
2090 | if (dev->num_tc) |
2091 | netif_setup_tc(dev, txq); | |
2092 | ||
024e9679 | 2093 | if (txq < dev->real_num_tx_queues) { |
e6484930 | 2094 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2095 | #ifdef CONFIG_XPS |
2096 | netif_reset_xps_queues_gt(dev, txq); | |
2097 | #endif | |
2098 | } | |
f0796d5c | 2099 | } |
e6484930 TH |
2100 | |
2101 | dev->real_num_tx_queues = txq; | |
2102 | return 0; | |
f0796d5c JF |
2103 | } |
2104 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2105 | |
a953be53 | 2106 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2107 | /** |
2108 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2109 | * @dev: Network device | |
2110 | * @rxq: Actual number of RX queues | |
2111 | * | |
2112 | * This must be called either with the rtnl_lock held or before | |
2113 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2114 | * negative error code. If called before registration, it always |
2115 | * succeeds. | |
62fe0b40 BH |
2116 | */ |
2117 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2118 | { | |
2119 | int rc; | |
2120 | ||
bd25fa7b TH |
2121 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2122 | return -EINVAL; | |
2123 | ||
62fe0b40 BH |
2124 | if (dev->reg_state == NETREG_REGISTERED) { |
2125 | ASSERT_RTNL(); | |
2126 | ||
62fe0b40 BH |
2127 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2128 | rxq); | |
2129 | if (rc) | |
2130 | return rc; | |
62fe0b40 BH |
2131 | } |
2132 | ||
2133 | dev->real_num_rx_queues = rxq; | |
2134 | return 0; | |
2135 | } | |
2136 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2137 | #endif | |
2138 | ||
2c53040f BH |
2139 | /** |
2140 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
2141 | * |
2142 | * This routine should set an upper limit on the number of RSS queues | |
2143 | * used by default by multiqueue devices. | |
2144 | */ | |
a55b138b | 2145 | int netif_get_num_default_rss_queues(void) |
16917b87 YM |
2146 | { |
2147 | return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
2148 | } | |
2149 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
2150 | ||
def82a1d | 2151 | static inline void __netif_reschedule(struct Qdisc *q) |
56079431 | 2152 | { |
def82a1d JP |
2153 | struct softnet_data *sd; |
2154 | unsigned long flags; | |
56079431 | 2155 | |
def82a1d | 2156 | local_irq_save(flags); |
903ceff7 | 2157 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
2158 | q->next_sched = NULL; |
2159 | *sd->output_queue_tailp = q; | |
2160 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
2161 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
2162 | local_irq_restore(flags); | |
2163 | } | |
2164 | ||
2165 | void __netif_schedule(struct Qdisc *q) | |
2166 | { | |
2167 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
2168 | __netif_reschedule(q); | |
56079431 DV |
2169 | } |
2170 | EXPORT_SYMBOL(__netif_schedule); | |
2171 | ||
e6247027 ED |
2172 | struct dev_kfree_skb_cb { |
2173 | enum skb_free_reason reason; | |
2174 | }; | |
2175 | ||
2176 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 2177 | { |
e6247027 ED |
2178 | return (struct dev_kfree_skb_cb *)skb->cb; |
2179 | } | |
2180 | ||
46e5da40 JF |
2181 | void netif_schedule_queue(struct netdev_queue *txq) |
2182 | { | |
2183 | rcu_read_lock(); | |
2184 | if (!(txq->state & QUEUE_STATE_ANY_XOFF)) { | |
2185 | struct Qdisc *q = rcu_dereference(txq->qdisc); | |
2186 | ||
2187 | __netif_schedule(q); | |
2188 | } | |
2189 | rcu_read_unlock(); | |
2190 | } | |
2191 | EXPORT_SYMBOL(netif_schedule_queue); | |
2192 | ||
2193 | /** | |
2194 | * netif_wake_subqueue - allow sending packets on subqueue | |
2195 | * @dev: network device | |
2196 | * @queue_index: sub queue index | |
2197 | * | |
2198 | * Resume individual transmit queue of a device with multiple transmit queues. | |
2199 | */ | |
2200 | void netif_wake_subqueue(struct net_device *dev, u16 queue_index) | |
2201 | { | |
2202 | struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index); | |
2203 | ||
2204 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state)) { | |
2205 | struct Qdisc *q; | |
2206 | ||
2207 | rcu_read_lock(); | |
2208 | q = rcu_dereference(txq->qdisc); | |
2209 | __netif_schedule(q); | |
2210 | rcu_read_unlock(); | |
2211 | } | |
2212 | } | |
2213 | EXPORT_SYMBOL(netif_wake_subqueue); | |
2214 | ||
2215 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) | |
2216 | { | |
2217 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
2218 | struct Qdisc *q; | |
2219 | ||
2220 | rcu_read_lock(); | |
2221 | q = rcu_dereference(dev_queue->qdisc); | |
2222 | __netif_schedule(q); | |
2223 | rcu_read_unlock(); | |
2224 | } | |
2225 | } | |
2226 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
2227 | ||
e6247027 | 2228 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 | 2229 | { |
e6247027 | 2230 | unsigned long flags; |
56079431 | 2231 | |
e6247027 ED |
2232 | if (likely(atomic_read(&skb->users) == 1)) { |
2233 | smp_rmb(); | |
2234 | atomic_set(&skb->users, 0); | |
2235 | } else if (likely(!atomic_dec_and_test(&skb->users))) { | |
2236 | return; | |
bea3348e | 2237 | } |
e6247027 ED |
2238 | get_kfree_skb_cb(skb)->reason = reason; |
2239 | local_irq_save(flags); | |
2240 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
2241 | __this_cpu_write(softnet_data.completion_queue, skb); | |
2242 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
2243 | local_irq_restore(flags); | |
56079431 | 2244 | } |
e6247027 | 2245 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 2246 | |
e6247027 | 2247 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
2248 | { |
2249 | if (in_irq() || irqs_disabled()) | |
e6247027 | 2250 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
2251 | else |
2252 | dev_kfree_skb(skb); | |
2253 | } | |
e6247027 | 2254 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
2255 | |
2256 | ||
bea3348e SH |
2257 | /** |
2258 | * netif_device_detach - mark device as removed | |
2259 | * @dev: network device | |
2260 | * | |
2261 | * Mark device as removed from system and therefore no longer available. | |
2262 | */ | |
56079431 DV |
2263 | void netif_device_detach(struct net_device *dev) |
2264 | { | |
2265 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2266 | netif_running(dev)) { | |
d543103a | 2267 | netif_tx_stop_all_queues(dev); |
56079431 DV |
2268 | } |
2269 | } | |
2270 | EXPORT_SYMBOL(netif_device_detach); | |
2271 | ||
bea3348e SH |
2272 | /** |
2273 | * netif_device_attach - mark device as attached | |
2274 | * @dev: network device | |
2275 | * | |
2276 | * Mark device as attached from system and restart if needed. | |
2277 | */ | |
56079431 DV |
2278 | void netif_device_attach(struct net_device *dev) |
2279 | { | |
2280 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2281 | netif_running(dev)) { | |
d543103a | 2282 | netif_tx_wake_all_queues(dev); |
4ec93edb | 2283 | __netdev_watchdog_up(dev); |
56079431 DV |
2284 | } |
2285 | } | |
2286 | EXPORT_SYMBOL(netif_device_attach); | |
2287 | ||
36c92474 BH |
2288 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
2289 | { | |
65e9d2fa | 2290 | static const netdev_features_t null_features = 0; |
36c92474 BH |
2291 | struct net_device *dev = skb->dev; |
2292 | const char *driver = ""; | |
2293 | ||
c846ad9b BG |
2294 | if (!net_ratelimit()) |
2295 | return; | |
2296 | ||
36c92474 BH |
2297 | if (dev && dev->dev.parent) |
2298 | driver = dev_driver_string(dev->dev.parent); | |
2299 | ||
2300 | WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d " | |
2301 | "gso_type=%d ip_summed=%d\n", | |
65e9d2fa MM |
2302 | driver, dev ? &dev->features : &null_features, |
2303 | skb->sk ? &skb->sk->sk_route_caps : &null_features, | |
36c92474 BH |
2304 | skb->len, skb->data_len, skb_shinfo(skb)->gso_size, |
2305 | skb_shinfo(skb)->gso_type, skb->ip_summed); | |
2306 | } | |
2307 | ||
1da177e4 LT |
2308 | /* |
2309 | * Invalidate hardware checksum when packet is to be mangled, and | |
2310 | * complete checksum manually on outgoing path. | |
2311 | */ | |
84fa7933 | 2312 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 2313 | { |
d3bc23e7 | 2314 | __wsum csum; |
663ead3b | 2315 | int ret = 0, offset; |
1da177e4 | 2316 | |
84fa7933 | 2317 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
2318 | goto out_set_summed; |
2319 | ||
2320 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
36c92474 BH |
2321 | skb_warn_bad_offload(skb); |
2322 | return -EINVAL; | |
1da177e4 LT |
2323 | } |
2324 | ||
cef401de ED |
2325 | /* Before computing a checksum, we should make sure no frag could |
2326 | * be modified by an external entity : checksum could be wrong. | |
2327 | */ | |
2328 | if (skb_has_shared_frag(skb)) { | |
2329 | ret = __skb_linearize(skb); | |
2330 | if (ret) | |
2331 | goto out; | |
2332 | } | |
2333 | ||
55508d60 | 2334 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
2335 | BUG_ON(offset >= skb_headlen(skb)); |
2336 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2337 | ||
2338 | offset += skb->csum_offset; | |
2339 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
2340 | ||
2341 | if (skb_cloned(skb) && | |
2342 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
2343 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
2344 | if (ret) | |
2345 | goto out; | |
2346 | } | |
2347 | ||
a030847e | 2348 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
a430a43d | 2349 | out_set_summed: |
1da177e4 | 2350 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 2351 | out: |
1da177e4 LT |
2352 | return ret; |
2353 | } | |
d1b19dff | 2354 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 2355 | |
53d6471c | 2356 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 2357 | { |
4b9b1cdf | 2358 | unsigned int vlan_depth = skb->mac_len; |
252e3346 | 2359 | __be16 type = skb->protocol; |
f6a78bfc | 2360 | |
19acc327 PS |
2361 | /* Tunnel gso handlers can set protocol to ethernet. */ |
2362 | if (type == htons(ETH_P_TEB)) { | |
2363 | struct ethhdr *eth; | |
2364 | ||
2365 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
2366 | return 0; | |
2367 | ||
2368 | eth = (struct ethhdr *)skb_mac_header(skb); | |
2369 | type = eth->h_proto; | |
2370 | } | |
2371 | ||
4b9b1cdf NA |
2372 | /* if skb->protocol is 802.1Q/AD then the header should already be |
2373 | * present at mac_len - VLAN_HLEN (if mac_len > 0), or at | |
2374 | * ETH_HLEN otherwise | |
2375 | */ | |
2376 | if (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) { | |
2377 | if (vlan_depth) { | |
80019d31 | 2378 | if (WARN_ON(vlan_depth < VLAN_HLEN)) |
4b9b1cdf NA |
2379 | return 0; |
2380 | vlan_depth -= VLAN_HLEN; | |
2381 | } else { | |
2382 | vlan_depth = ETH_HLEN; | |
2383 | } | |
2384 | do { | |
2385 | struct vlan_hdr *vh; | |
2386 | ||
2387 | if (unlikely(!pskb_may_pull(skb, | |
2388 | vlan_depth + VLAN_HLEN))) | |
2389 | return 0; | |
2390 | ||
2391 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); | |
2392 | type = vh->h_vlan_encapsulated_proto; | |
2393 | vlan_depth += VLAN_HLEN; | |
2394 | } while (type == htons(ETH_P_8021Q) || | |
2395 | type == htons(ETH_P_8021AD)); | |
7b9c6090 JG |
2396 | } |
2397 | ||
53d6471c VY |
2398 | *depth = vlan_depth; |
2399 | ||
ec5f0615 PS |
2400 | return type; |
2401 | } | |
2402 | ||
2403 | /** | |
2404 | * skb_mac_gso_segment - mac layer segmentation handler. | |
2405 | * @skb: buffer to segment | |
2406 | * @features: features for the output path (see dev->features) | |
2407 | */ | |
2408 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
2409 | netdev_features_t features) | |
2410 | { | |
2411 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
2412 | struct packet_offload *ptype; | |
53d6471c VY |
2413 | int vlan_depth = skb->mac_len; |
2414 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
2415 | |
2416 | if (unlikely(!type)) | |
2417 | return ERR_PTR(-EINVAL); | |
2418 | ||
53d6471c | 2419 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
2420 | |
2421 | rcu_read_lock(); | |
22061d80 | 2422 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 2423 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
f191a1d1 | 2424 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
2425 | break; |
2426 | } | |
2427 | } | |
2428 | rcu_read_unlock(); | |
2429 | ||
98e399f8 | 2430 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 2431 | |
f6a78bfc HX |
2432 | return segs; |
2433 | } | |
05e8ef4a PS |
2434 | EXPORT_SYMBOL(skb_mac_gso_segment); |
2435 | ||
2436 | ||
2437 | /* openvswitch calls this on rx path, so we need a different check. | |
2438 | */ | |
2439 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
2440 | { | |
2441 | if (tx_path) | |
2442 | return skb->ip_summed != CHECKSUM_PARTIAL; | |
2443 | else | |
2444 | return skb->ip_summed == CHECKSUM_NONE; | |
2445 | } | |
2446 | ||
2447 | /** | |
2448 | * __skb_gso_segment - Perform segmentation on skb. | |
2449 | * @skb: buffer to segment | |
2450 | * @features: features for the output path (see dev->features) | |
2451 | * @tx_path: whether it is called in TX path | |
2452 | * | |
2453 | * This function segments the given skb and returns a list of segments. | |
2454 | * | |
2455 | * It may return NULL if the skb requires no segmentation. This is | |
2456 | * only possible when GSO is used for verifying header integrity. | |
2457 | */ | |
2458 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
2459 | netdev_features_t features, bool tx_path) | |
2460 | { | |
2461 | if (unlikely(skb_needs_check(skb, tx_path))) { | |
2462 | int err; | |
2463 | ||
2464 | skb_warn_bad_offload(skb); | |
2465 | ||
a40e0a66 | 2466 | err = skb_cow_head(skb, 0); |
2467 | if (err < 0) | |
05e8ef4a PS |
2468 | return ERR_PTR(err); |
2469 | } | |
2470 | ||
68c33163 | 2471 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
2472 | SKB_GSO_CB(skb)->encap_level = 0; |
2473 | ||
05e8ef4a PS |
2474 | skb_reset_mac_header(skb); |
2475 | skb_reset_mac_len(skb); | |
2476 | ||
2477 | return skb_mac_gso_segment(skb, features); | |
2478 | } | |
12b0004d | 2479 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 2480 | |
fb286bb2 HX |
2481 | /* Take action when hardware reception checksum errors are detected. */ |
2482 | #ifdef CONFIG_BUG | |
2483 | void netdev_rx_csum_fault(struct net_device *dev) | |
2484 | { | |
2485 | if (net_ratelimit()) { | |
7b6cd1ce | 2486 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
2487 | dump_stack(); |
2488 | } | |
2489 | } | |
2490 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
2491 | #endif | |
2492 | ||
1da177e4 LT |
2493 | /* Actually, we should eliminate this check as soon as we know, that: |
2494 | * 1. IOMMU is present and allows to map all the memory. | |
2495 | * 2. No high memory really exists on this machine. | |
2496 | */ | |
2497 | ||
c1e756bf | 2498 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 2499 | { |
3d3a8533 | 2500 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 2501 | int i; |
5acbbd42 | 2502 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
2503 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
2504 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
2505 | if (PageHighMem(skb_frag_page(frag))) | |
5acbbd42 | 2506 | return 1; |
ea2ab693 | 2507 | } |
5acbbd42 | 2508 | } |
1da177e4 | 2509 | |
5acbbd42 FT |
2510 | if (PCI_DMA_BUS_IS_PHYS) { |
2511 | struct device *pdev = dev->dev.parent; | |
1da177e4 | 2512 | |
9092c658 ED |
2513 | if (!pdev) |
2514 | return 0; | |
5acbbd42 | 2515 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
ea2ab693 IC |
2516 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
2517 | dma_addr_t addr = page_to_phys(skb_frag_page(frag)); | |
5acbbd42 FT |
2518 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
2519 | return 1; | |
2520 | } | |
2521 | } | |
3d3a8533 | 2522 | #endif |
1da177e4 LT |
2523 | return 0; |
2524 | } | |
1da177e4 | 2525 | |
3b392ddb SH |
2526 | /* If MPLS offload request, verify we are testing hardware MPLS features |
2527 | * instead of standard features for the netdev. | |
2528 | */ | |
2529 | #ifdef CONFIG_NET_MPLS_GSO | |
2530 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
2531 | netdev_features_t features, | |
2532 | __be16 type) | |
2533 | { | |
25cd9ba0 | 2534 | if (eth_p_mpls(type)) |
3b392ddb SH |
2535 | features &= skb->dev->mpls_features; |
2536 | ||
2537 | return features; | |
2538 | } | |
2539 | #else | |
2540 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
2541 | netdev_features_t features, | |
2542 | __be16 type) | |
2543 | { | |
2544 | return features; | |
2545 | } | |
2546 | #endif | |
2547 | ||
c8f44aff | 2548 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 2549 | netdev_features_t features) |
f01a5236 | 2550 | { |
53d6471c | 2551 | int tmp; |
3b392ddb SH |
2552 | __be16 type; |
2553 | ||
2554 | type = skb_network_protocol(skb, &tmp); | |
2555 | features = net_mpls_features(skb, features, type); | |
53d6471c | 2556 | |
c0d680e5 | 2557 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 2558 | !can_checksum_protocol(features, type)) { |
f01a5236 | 2559 | features &= ~NETIF_F_ALL_CSUM; |
c1e756bf | 2560 | } else if (illegal_highdma(skb->dev, skb)) { |
f01a5236 JG |
2561 | features &= ~NETIF_F_SG; |
2562 | } | |
2563 | ||
2564 | return features; | |
2565 | } | |
2566 | ||
c1e756bf | 2567 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 2568 | { |
fcbeb976 ED |
2569 | const struct net_device *dev = skb->dev; |
2570 | netdev_features_t features = dev->features; | |
2571 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
58e998c6 JG |
2572 | __be16 protocol = skb->protocol; |
2573 | ||
fcbeb976 | 2574 | if (gso_segs > dev->gso_max_segs || gso_segs < dev->gso_min_segs) |
30b678d8 BH |
2575 | features &= ~NETIF_F_GSO_MASK; |
2576 | ||
8ad227ff | 2577 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) { |
58e998c6 JG |
2578 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
2579 | protocol = veh->h_vlan_encapsulated_proto; | |
f01a5236 | 2580 | } else if (!vlan_tx_tag_present(skb)) { |
c1e756bf | 2581 | return harmonize_features(skb, features); |
f01a5236 | 2582 | } |
58e998c6 | 2583 | |
db115037 | 2584 | features = netdev_intersect_features(features, |
fcbeb976 | 2585 | dev->vlan_features | |
db115037 MK |
2586 | NETIF_F_HW_VLAN_CTAG_TX | |
2587 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 2588 | |
cdbaa0bb | 2589 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) |
db115037 MK |
2590 | features = netdev_intersect_features(features, |
2591 | NETIF_F_SG | | |
2592 | NETIF_F_HIGHDMA | | |
2593 | NETIF_F_FRAGLIST | | |
2594 | NETIF_F_GEN_CSUM | | |
2595 | NETIF_F_HW_VLAN_CTAG_TX | | |
2596 | NETIF_F_HW_VLAN_STAG_TX); | |
cdbaa0bb | 2597 | |
c1e756bf | 2598 | return harmonize_features(skb, features); |
58e998c6 | 2599 | } |
c1e756bf | 2600 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 2601 | |
2ea25513 | 2602 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 2603 | struct netdev_queue *txq, bool more) |
f6a78bfc | 2604 | { |
2ea25513 DM |
2605 | unsigned int len; |
2606 | int rc; | |
00829823 | 2607 | |
2ea25513 DM |
2608 | if (!list_empty(&ptype_all)) |
2609 | dev_queue_xmit_nit(skb, dev); | |
fc741216 | 2610 | |
2ea25513 DM |
2611 | len = skb->len; |
2612 | trace_net_dev_start_xmit(skb, dev); | |
95f6b3dd | 2613 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 2614 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 2615 | |
2ea25513 DM |
2616 | return rc; |
2617 | } | |
7b9c6090 | 2618 | |
8dcda22a DM |
2619 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
2620 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
2621 | { |
2622 | struct sk_buff *skb = first; | |
2623 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 2624 | |
7f2e870f DM |
2625 | while (skb) { |
2626 | struct sk_buff *next = skb->next; | |
fc70fb64 | 2627 | |
7f2e870f | 2628 | skb->next = NULL; |
95f6b3dd | 2629 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
2630 | if (unlikely(!dev_xmit_complete(rc))) { |
2631 | skb->next = next; | |
2632 | goto out; | |
2633 | } | |
6afff0ca | 2634 | |
7f2e870f DM |
2635 | skb = next; |
2636 | if (netif_xmit_stopped(txq) && skb) { | |
2637 | rc = NETDEV_TX_BUSY; | |
2638 | break; | |
9ccb8975 | 2639 | } |
7f2e870f | 2640 | } |
9ccb8975 | 2641 | |
7f2e870f DM |
2642 | out: |
2643 | *ret = rc; | |
2644 | return skb; | |
2645 | } | |
b40863c6 | 2646 | |
1ff0dc94 ED |
2647 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
2648 | netdev_features_t features) | |
f6a78bfc | 2649 | { |
eae3f88e DM |
2650 | if (vlan_tx_tag_present(skb) && |
2651 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { | |
2652 | skb = __vlan_put_tag(skb, skb->vlan_proto, | |
2653 | vlan_tx_tag_get(skb)); | |
2654 | if (skb) | |
2655 | skb->vlan_tci = 0; | |
f6a78bfc | 2656 | } |
eae3f88e DM |
2657 | return skb; |
2658 | } | |
f6a78bfc | 2659 | |
55a93b3e | 2660 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev) |
eae3f88e DM |
2661 | { |
2662 | netdev_features_t features; | |
f6a78bfc | 2663 | |
eae3f88e DM |
2664 | if (skb->next) |
2665 | return skb; | |
068a2de5 | 2666 | |
eae3f88e DM |
2667 | features = netif_skb_features(skb); |
2668 | skb = validate_xmit_vlan(skb, features); | |
2669 | if (unlikely(!skb)) | |
2670 | goto out_null; | |
7b9c6090 | 2671 | |
eae3f88e DM |
2672 | /* If encapsulation offload request, verify we are testing |
2673 | * hardware encapsulation features instead of standard | |
2674 | * features for the netdev | |
2675 | */ | |
2676 | if (skb->encapsulation) | |
2677 | features &= dev->hw_enc_features; | |
2678 | ||
04ffcb25 | 2679 | if (netif_needs_gso(dev, skb, features)) { |
ce93718f DM |
2680 | struct sk_buff *segs; |
2681 | ||
2682 | segs = skb_gso_segment(skb, features); | |
cecda693 | 2683 | if (IS_ERR(segs)) { |
ce93718f | 2684 | segs = NULL; |
cecda693 JW |
2685 | } else if (segs) { |
2686 | consume_skb(skb); | |
2687 | skb = segs; | |
f6a78bfc | 2688 | } |
eae3f88e DM |
2689 | } else { |
2690 | if (skb_needs_linearize(skb, features) && | |
2691 | __skb_linearize(skb)) | |
2692 | goto out_kfree_skb; | |
4ec93edb | 2693 | |
eae3f88e DM |
2694 | /* If packet is not checksummed and device does not |
2695 | * support checksumming for this protocol, complete | |
2696 | * checksumming here. | |
2697 | */ | |
2698 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
2699 | if (skb->encapsulation) | |
2700 | skb_set_inner_transport_header(skb, | |
2701 | skb_checksum_start_offset(skb)); | |
2702 | else | |
2703 | skb_set_transport_header(skb, | |
2704 | skb_checksum_start_offset(skb)); | |
2705 | if (!(features & NETIF_F_ALL_CSUM) && | |
2706 | skb_checksum_help(skb)) | |
2707 | goto out_kfree_skb; | |
7b9c6090 | 2708 | } |
0c772159 | 2709 | } |
7b9c6090 | 2710 | |
eae3f88e | 2711 | return skb; |
fc70fb64 | 2712 | |
f6a78bfc HX |
2713 | out_kfree_skb: |
2714 | kfree_skb(skb); | |
eae3f88e DM |
2715 | out_null: |
2716 | return NULL; | |
2717 | } | |
6afff0ca | 2718 | |
55a93b3e ED |
2719 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev) |
2720 | { | |
2721 | struct sk_buff *next, *head = NULL, *tail; | |
2722 | ||
bec3cfdc | 2723 | for (; skb != NULL; skb = next) { |
55a93b3e ED |
2724 | next = skb->next; |
2725 | skb->next = NULL; | |
bec3cfdc ED |
2726 | |
2727 | /* in case skb wont be segmented, point to itself */ | |
2728 | skb->prev = skb; | |
2729 | ||
55a93b3e | 2730 | skb = validate_xmit_skb(skb, dev); |
bec3cfdc ED |
2731 | if (!skb) |
2732 | continue; | |
55a93b3e | 2733 | |
bec3cfdc ED |
2734 | if (!head) |
2735 | head = skb; | |
2736 | else | |
2737 | tail->next = skb; | |
2738 | /* If skb was segmented, skb->prev points to | |
2739 | * the last segment. If not, it still contains skb. | |
2740 | */ | |
2741 | tail = skb->prev; | |
55a93b3e ED |
2742 | } |
2743 | return head; | |
f6a78bfc HX |
2744 | } |
2745 | ||
1def9238 ED |
2746 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
2747 | { | |
2748 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
2749 | ||
2750 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
2751 | ||
2752 | /* To get more precise estimation of bytes sent on wire, | |
2753 | * we add to pkt_len the headers size of all segments | |
2754 | */ | |
2755 | if (shinfo->gso_size) { | |
757b8b1d | 2756 | unsigned int hdr_len; |
15e5a030 | 2757 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 2758 | |
757b8b1d ED |
2759 | /* mac layer + network layer */ |
2760 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
2761 | ||
2762 | /* + transport layer */ | |
1def9238 ED |
2763 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) |
2764 | hdr_len += tcp_hdrlen(skb); | |
2765 | else | |
2766 | hdr_len += sizeof(struct udphdr); | |
15e5a030 JW |
2767 | |
2768 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
2769 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
2770 | shinfo->gso_size); | |
2771 | ||
2772 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
2773 | } |
2774 | } | |
2775 | ||
bbd8a0d3 KK |
2776 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
2777 | struct net_device *dev, | |
2778 | struct netdev_queue *txq) | |
2779 | { | |
2780 | spinlock_t *root_lock = qdisc_lock(q); | |
a2da570d | 2781 | bool contended; |
bbd8a0d3 KK |
2782 | int rc; |
2783 | ||
1def9238 | 2784 | qdisc_pkt_len_init(skb); |
a2da570d | 2785 | qdisc_calculate_pkt_len(skb, q); |
79640a4c ED |
2786 | /* |
2787 | * Heuristic to force contended enqueues to serialize on a | |
2788 | * separate lock before trying to get qdisc main lock. | |
9bf2b8c2 YX |
2789 | * This permits __QDISC___STATE_RUNNING owner to get the lock more |
2790 | * often and dequeue packets faster. | |
79640a4c | 2791 | */ |
a2da570d | 2792 | contended = qdisc_is_running(q); |
79640a4c ED |
2793 | if (unlikely(contended)) |
2794 | spin_lock(&q->busylock); | |
2795 | ||
bbd8a0d3 KK |
2796 | spin_lock(root_lock); |
2797 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
2798 | kfree_skb(skb); | |
2799 | rc = NET_XMIT_DROP; | |
2800 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 2801 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
2802 | /* |
2803 | * This is a work-conserving queue; there are no old skbs | |
2804 | * waiting to be sent out; and the qdisc is not running - | |
2805 | * xmit the skb directly. | |
2806 | */ | |
bfe0d029 | 2807 | |
bfe0d029 ED |
2808 | qdisc_bstats_update(q, skb); |
2809 | ||
55a93b3e | 2810 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
2811 | if (unlikely(contended)) { |
2812 | spin_unlock(&q->busylock); | |
2813 | contended = false; | |
2814 | } | |
bbd8a0d3 | 2815 | __qdisc_run(q); |
79640a4c | 2816 | } else |
bc135b23 | 2817 | qdisc_run_end(q); |
bbd8a0d3 KK |
2818 | |
2819 | rc = NET_XMIT_SUCCESS; | |
2820 | } else { | |
a2da570d | 2821 | rc = q->enqueue(skb, q) & NET_XMIT_MASK; |
79640a4c ED |
2822 | if (qdisc_run_begin(q)) { |
2823 | if (unlikely(contended)) { | |
2824 | spin_unlock(&q->busylock); | |
2825 | contended = false; | |
2826 | } | |
2827 | __qdisc_run(q); | |
2828 | } | |
bbd8a0d3 KK |
2829 | } |
2830 | spin_unlock(root_lock); | |
79640a4c ED |
2831 | if (unlikely(contended)) |
2832 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
2833 | return rc; |
2834 | } | |
2835 | ||
86f8515f | 2836 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
2837 | static void skb_update_prio(struct sk_buff *skb) |
2838 | { | |
6977a79d | 2839 | struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap); |
5bc1421e | 2840 | |
91c68ce2 ED |
2841 | if (!skb->priority && skb->sk && map) { |
2842 | unsigned int prioidx = skb->sk->sk_cgrp_prioidx; | |
2843 | ||
2844 | if (prioidx < map->priomap_len) | |
2845 | skb->priority = map->priomap[prioidx]; | |
2846 | } | |
5bc1421e NH |
2847 | } |
2848 | #else | |
2849 | #define skb_update_prio(skb) | |
2850 | #endif | |
2851 | ||
745e20f1 | 2852 | static DEFINE_PER_CPU(int, xmit_recursion); |
11a766ce | 2853 | #define RECURSION_LIMIT 10 |
745e20f1 | 2854 | |
95603e22 MM |
2855 | /** |
2856 | * dev_loopback_xmit - loop back @skb | |
2857 | * @skb: buffer to transmit | |
2858 | */ | |
2859 | int dev_loopback_xmit(struct sk_buff *skb) | |
2860 | { | |
2861 | skb_reset_mac_header(skb); | |
2862 | __skb_pull(skb, skb_network_offset(skb)); | |
2863 | skb->pkt_type = PACKET_LOOPBACK; | |
2864 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2865 | WARN_ON(!skb_dst(skb)); | |
2866 | skb_dst_force(skb); | |
2867 | netif_rx_ni(skb); | |
2868 | return 0; | |
2869 | } | |
2870 | EXPORT_SYMBOL(dev_loopback_xmit); | |
2871 | ||
d29f749e | 2872 | /** |
9d08dd3d | 2873 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 2874 | * @skb: buffer to transmit |
9d08dd3d | 2875 | * @accel_priv: private data used for L2 forwarding offload |
d29f749e DJ |
2876 | * |
2877 | * Queue a buffer for transmission to a network device. The caller must | |
2878 | * have set the device and priority and built the buffer before calling | |
2879 | * this function. The function can be called from an interrupt. | |
2880 | * | |
2881 | * A negative errno code is returned on a failure. A success does not | |
2882 | * guarantee the frame will be transmitted as it may be dropped due | |
2883 | * to congestion or traffic shaping. | |
2884 | * | |
2885 | * ----------------------------------------------------------------------------------- | |
2886 | * I notice this method can also return errors from the queue disciplines, | |
2887 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
2888 | * be positive. | |
2889 | * | |
2890 | * Regardless of the return value, the skb is consumed, so it is currently | |
2891 | * difficult to retry a send to this method. (You can bump the ref count | |
2892 | * before sending to hold a reference for retry if you are careful.) | |
2893 | * | |
2894 | * When calling this method, interrupts MUST be enabled. This is because | |
2895 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
2896 | * --BLG | |
2897 | */ | |
0a59f3a9 | 2898 | static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) |
1da177e4 LT |
2899 | { |
2900 | struct net_device *dev = skb->dev; | |
dc2b4847 | 2901 | struct netdev_queue *txq; |
1da177e4 LT |
2902 | struct Qdisc *q; |
2903 | int rc = -ENOMEM; | |
2904 | ||
6d1ccff6 ED |
2905 | skb_reset_mac_header(skb); |
2906 | ||
e7fd2885 WB |
2907 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
2908 | __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); | |
2909 | ||
4ec93edb YH |
2910 | /* Disable soft irqs for various locks below. Also |
2911 | * stops preemption for RCU. | |
1da177e4 | 2912 | */ |
4ec93edb | 2913 | rcu_read_lock_bh(); |
1da177e4 | 2914 | |
5bc1421e NH |
2915 | skb_update_prio(skb); |
2916 | ||
02875878 ED |
2917 | /* If device/qdisc don't need skb->dst, release it right now while |
2918 | * its hot in this cpu cache. | |
2919 | */ | |
2920 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
2921 | skb_dst_drop(skb); | |
2922 | else | |
2923 | skb_dst_force(skb); | |
2924 | ||
f663dd9a | 2925 | txq = netdev_pick_tx(dev, skb, accel_priv); |
a898def2 | 2926 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 2927 | |
1da177e4 | 2928 | #ifdef CONFIG_NET_CLS_ACT |
d1b19dff | 2929 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
1da177e4 | 2930 | #endif |
cf66ba58 | 2931 | trace_net_dev_queue(skb); |
1da177e4 | 2932 | if (q->enqueue) { |
bbd8a0d3 | 2933 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 2934 | goto out; |
1da177e4 LT |
2935 | } |
2936 | ||
2937 | /* The device has no queue. Common case for software devices: | |
2938 | loopback, all the sorts of tunnels... | |
2939 | ||
932ff279 HX |
2940 | Really, it is unlikely that netif_tx_lock protection is necessary |
2941 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
2942 | counters.) |
2943 | However, it is possible, that they rely on protection | |
2944 | made by us here. | |
2945 | ||
2946 | Check this and shot the lock. It is not prone from deadlocks. | |
2947 | Either shot noqueue qdisc, it is even simpler 8) | |
2948 | */ | |
2949 | if (dev->flags & IFF_UP) { | |
2950 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
2951 | ||
c773e847 | 2952 | if (txq->xmit_lock_owner != cpu) { |
1da177e4 | 2953 | |
745e20f1 ED |
2954 | if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) |
2955 | goto recursion_alert; | |
2956 | ||
1f59533f JDB |
2957 | skb = validate_xmit_skb(skb, dev); |
2958 | if (!skb) | |
2959 | goto drop; | |
2960 | ||
c773e847 | 2961 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 2962 | |
73466498 | 2963 | if (!netif_xmit_stopped(txq)) { |
745e20f1 | 2964 | __this_cpu_inc(xmit_recursion); |
ce93718f | 2965 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
745e20f1 | 2966 | __this_cpu_dec(xmit_recursion); |
572a9d7b | 2967 | if (dev_xmit_complete(rc)) { |
c773e847 | 2968 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
2969 | goto out; |
2970 | } | |
2971 | } | |
c773e847 | 2972 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
2973 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
2974 | dev->name); | |
1da177e4 LT |
2975 | } else { |
2976 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
2977 | * unfortunately |
2978 | */ | |
2979 | recursion_alert: | |
e87cc472 JP |
2980 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
2981 | dev->name); | |
1da177e4 LT |
2982 | } |
2983 | } | |
2984 | ||
2985 | rc = -ENETDOWN; | |
1f59533f | 2986 | drop: |
d4828d85 | 2987 | rcu_read_unlock_bh(); |
1da177e4 | 2988 | |
015f0688 | 2989 | atomic_long_inc(&dev->tx_dropped); |
1f59533f | 2990 | kfree_skb_list(skb); |
1da177e4 LT |
2991 | return rc; |
2992 | out: | |
d4828d85 | 2993 | rcu_read_unlock_bh(); |
1da177e4 LT |
2994 | return rc; |
2995 | } | |
f663dd9a JW |
2996 | |
2997 | int dev_queue_xmit(struct sk_buff *skb) | |
2998 | { | |
2999 | return __dev_queue_xmit(skb, NULL); | |
3000 | } | |
d1b19dff | 3001 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 | 3002 | |
f663dd9a JW |
3003 | int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv) |
3004 | { | |
3005 | return __dev_queue_xmit(skb, accel_priv); | |
3006 | } | |
3007 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
3008 | ||
1da177e4 LT |
3009 | |
3010 | /*======================================================================= | |
3011 | Receiver routines | |
3012 | =======================================================================*/ | |
3013 | ||
6b2bedc3 | 3014 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
3015 | EXPORT_SYMBOL(netdev_max_backlog); |
3016 | ||
3b098e2d | 3017 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 SH |
3018 | int netdev_budget __read_mostly = 300; |
3019 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 | 3020 | |
eecfd7c4 ED |
3021 | /* Called with irq disabled */ |
3022 | static inline void ____napi_schedule(struct softnet_data *sd, | |
3023 | struct napi_struct *napi) | |
3024 | { | |
3025 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
3026 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3027 | } | |
3028 | ||
bfb564e7 KK |
3029 | #ifdef CONFIG_RPS |
3030 | ||
3031 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 3032 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 KK |
3033 | EXPORT_SYMBOL(rps_sock_flow_table); |
3034 | ||
c5905afb | 3035 | struct static_key rps_needed __read_mostly; |
adc9300e | 3036 | |
c445477d BH |
3037 | static struct rps_dev_flow * |
3038 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3039 | struct rps_dev_flow *rflow, u16 next_cpu) | |
3040 | { | |
09994d1b | 3041 | if (next_cpu != RPS_NO_CPU) { |
c445477d BH |
3042 | #ifdef CONFIG_RFS_ACCEL |
3043 | struct netdev_rx_queue *rxqueue; | |
3044 | struct rps_dev_flow_table *flow_table; | |
3045 | struct rps_dev_flow *old_rflow; | |
3046 | u32 flow_id; | |
3047 | u16 rxq_index; | |
3048 | int rc; | |
3049 | ||
3050 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
3051 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
3052 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
3053 | goto out; |
3054 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
3055 | if (rxq_index == skb_get_rx_queue(skb)) | |
3056 | goto out; | |
3057 | ||
3058 | rxqueue = dev->_rx + rxq_index; | |
3059 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3060 | if (!flow_table) | |
3061 | goto out; | |
61b905da | 3062 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
3063 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
3064 | rxq_index, flow_id); | |
3065 | if (rc < 0) | |
3066 | goto out; | |
3067 | old_rflow = rflow; | |
3068 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
3069 | rflow->filter = rc; |
3070 | if (old_rflow->filter == rflow->filter) | |
3071 | old_rflow->filter = RPS_NO_FILTER; | |
3072 | out: | |
3073 | #endif | |
3074 | rflow->last_qtail = | |
09994d1b | 3075 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
3076 | } |
3077 | ||
09994d1b | 3078 | rflow->cpu = next_cpu; |
c445477d BH |
3079 | return rflow; |
3080 | } | |
3081 | ||
bfb564e7 KK |
3082 | /* |
3083 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
3084 | * CPU from the RPS map of the receiving queue for a given skb. | |
3085 | * rcu_read_lock must be held on entry. | |
3086 | */ | |
3087 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3088 | struct rps_dev_flow **rflowp) | |
3089 | { | |
3090 | struct netdev_rx_queue *rxqueue; | |
6e3f7faf | 3091 | struct rps_map *map; |
bfb564e7 KK |
3092 | struct rps_dev_flow_table *flow_table; |
3093 | struct rps_sock_flow_table *sock_flow_table; | |
3094 | int cpu = -1; | |
3095 | u16 tcpu; | |
61b905da | 3096 | u32 hash; |
bfb564e7 KK |
3097 | |
3098 | if (skb_rx_queue_recorded(skb)) { | |
3099 | u16 index = skb_get_rx_queue(skb); | |
62fe0b40 BH |
3100 | if (unlikely(index >= dev->real_num_rx_queues)) { |
3101 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
3102 | "%s received packet on queue %u, but number " | |
3103 | "of RX queues is %u\n", | |
3104 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
3105 | goto done; |
3106 | } | |
3107 | rxqueue = dev->_rx + index; | |
3108 | } else | |
3109 | rxqueue = dev->_rx; | |
3110 | ||
6e3f7faf ED |
3111 | map = rcu_dereference(rxqueue->rps_map); |
3112 | if (map) { | |
85875236 | 3113 | if (map->len == 1 && |
33d480ce | 3114 | !rcu_access_pointer(rxqueue->rps_flow_table)) { |
6febfca9 CG |
3115 | tcpu = map->cpus[0]; |
3116 | if (cpu_online(tcpu)) | |
3117 | cpu = tcpu; | |
3118 | goto done; | |
3119 | } | |
33d480ce | 3120 | } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) { |
bfb564e7 | 3121 | goto done; |
6febfca9 | 3122 | } |
bfb564e7 | 3123 | |
2d47b459 | 3124 | skb_reset_network_header(skb); |
61b905da TH |
3125 | hash = skb_get_hash(skb); |
3126 | if (!hash) | |
bfb564e7 KK |
3127 | goto done; |
3128 | ||
fec5e652 TH |
3129 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
3130 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
3131 | if (flow_table && sock_flow_table) { | |
3132 | u16 next_cpu; | |
3133 | struct rps_dev_flow *rflow; | |
3134 | ||
61b905da | 3135 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
3136 | tcpu = rflow->cpu; |
3137 | ||
61b905da | 3138 | next_cpu = sock_flow_table->ents[hash & sock_flow_table->mask]; |
fec5e652 TH |
3139 | |
3140 | /* | |
3141 | * If the desired CPU (where last recvmsg was done) is | |
3142 | * different from current CPU (one in the rx-queue flow | |
3143 | * table entry), switch if one of the following holds: | |
3144 | * - Current CPU is unset (equal to RPS_NO_CPU). | |
3145 | * - Current CPU is offline. | |
3146 | * - The current CPU's queue tail has advanced beyond the | |
3147 | * last packet that was enqueued using this table entry. | |
3148 | * This guarantees that all previous packets for the flow | |
3149 | * have been dequeued, thus preserving in order delivery. | |
3150 | */ | |
3151 | if (unlikely(tcpu != next_cpu) && | |
3152 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || | |
3153 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - | |
baefa31d TH |
3154 | rflow->last_qtail)) >= 0)) { |
3155 | tcpu = next_cpu; | |
c445477d | 3156 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 3157 | } |
c445477d | 3158 | |
fec5e652 TH |
3159 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
3160 | *rflowp = rflow; | |
3161 | cpu = tcpu; | |
3162 | goto done; | |
3163 | } | |
3164 | } | |
3165 | ||
0a9627f2 | 3166 | if (map) { |
8fc54f68 | 3167 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
3168 | if (cpu_online(tcpu)) { |
3169 | cpu = tcpu; | |
3170 | goto done; | |
3171 | } | |
3172 | } | |
3173 | ||
3174 | done: | |
0a9627f2 TH |
3175 | return cpu; |
3176 | } | |
3177 | ||
c445477d BH |
3178 | #ifdef CONFIG_RFS_ACCEL |
3179 | ||
3180 | /** | |
3181 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
3182 | * @dev: Device on which the filter was set | |
3183 | * @rxq_index: RX queue index | |
3184 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
3185 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
3186 | * | |
3187 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
3188 | * this function for each installed filter and remove the filters for | |
3189 | * which it returns %true. | |
3190 | */ | |
3191 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
3192 | u32 flow_id, u16 filter_id) | |
3193 | { | |
3194 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
3195 | struct rps_dev_flow_table *flow_table; | |
3196 | struct rps_dev_flow *rflow; | |
3197 | bool expire = true; | |
3198 | int cpu; | |
3199 | ||
3200 | rcu_read_lock(); | |
3201 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3202 | if (flow_table && flow_id <= flow_table->mask) { | |
3203 | rflow = &flow_table->flows[flow_id]; | |
3204 | cpu = ACCESS_ONCE(rflow->cpu); | |
3205 | if (rflow->filter == filter_id && cpu != RPS_NO_CPU && | |
3206 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - | |
3207 | rflow->last_qtail) < | |
3208 | (int)(10 * flow_table->mask))) | |
3209 | expire = false; | |
3210 | } | |
3211 | rcu_read_unlock(); | |
3212 | return expire; | |
3213 | } | |
3214 | EXPORT_SYMBOL(rps_may_expire_flow); | |
3215 | ||
3216 | #endif /* CONFIG_RFS_ACCEL */ | |
3217 | ||
0a9627f2 | 3218 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 3219 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 3220 | { |
e36fa2f7 ED |
3221 | struct softnet_data *sd = data; |
3222 | ||
eecfd7c4 | 3223 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 3224 | sd->received_rps++; |
0a9627f2 | 3225 | } |
e36fa2f7 | 3226 | |
fec5e652 | 3227 | #endif /* CONFIG_RPS */ |
0a9627f2 | 3228 | |
e36fa2f7 ED |
3229 | /* |
3230 | * Check if this softnet_data structure is another cpu one | |
3231 | * If yes, queue it to our IPI list and return 1 | |
3232 | * If no, return 0 | |
3233 | */ | |
3234 | static int rps_ipi_queued(struct softnet_data *sd) | |
3235 | { | |
3236 | #ifdef CONFIG_RPS | |
903ceff7 | 3237 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 ED |
3238 | |
3239 | if (sd != mysd) { | |
3240 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
3241 | mysd->rps_ipi_list = sd; | |
3242 | ||
3243 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3244 | return 1; | |
3245 | } | |
3246 | #endif /* CONFIG_RPS */ | |
3247 | return 0; | |
3248 | } | |
3249 | ||
99bbc707 WB |
3250 | #ifdef CONFIG_NET_FLOW_LIMIT |
3251 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
3252 | #endif | |
3253 | ||
3254 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
3255 | { | |
3256 | #ifdef CONFIG_NET_FLOW_LIMIT | |
3257 | struct sd_flow_limit *fl; | |
3258 | struct softnet_data *sd; | |
3259 | unsigned int old_flow, new_flow; | |
3260 | ||
3261 | if (qlen < (netdev_max_backlog >> 1)) | |
3262 | return false; | |
3263 | ||
903ceff7 | 3264 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
3265 | |
3266 | rcu_read_lock(); | |
3267 | fl = rcu_dereference(sd->flow_limit); | |
3268 | if (fl) { | |
3958afa1 | 3269 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
3270 | old_flow = fl->history[fl->history_head]; |
3271 | fl->history[fl->history_head] = new_flow; | |
3272 | ||
3273 | fl->history_head++; | |
3274 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
3275 | ||
3276 | if (likely(fl->buckets[old_flow])) | |
3277 | fl->buckets[old_flow]--; | |
3278 | ||
3279 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
3280 | fl->count++; | |
3281 | rcu_read_unlock(); | |
3282 | return true; | |
3283 | } | |
3284 | } | |
3285 | rcu_read_unlock(); | |
3286 | #endif | |
3287 | return false; | |
3288 | } | |
3289 | ||
0a9627f2 TH |
3290 | /* |
3291 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
3292 | * queue (may be a remote CPU queue). | |
3293 | */ | |
fec5e652 TH |
3294 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
3295 | unsigned int *qtail) | |
0a9627f2 | 3296 | { |
e36fa2f7 | 3297 | struct softnet_data *sd; |
0a9627f2 | 3298 | unsigned long flags; |
99bbc707 | 3299 | unsigned int qlen; |
0a9627f2 | 3300 | |
e36fa2f7 | 3301 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
3302 | |
3303 | local_irq_save(flags); | |
0a9627f2 | 3304 | |
e36fa2f7 | 3305 | rps_lock(sd); |
99bbc707 WB |
3306 | qlen = skb_queue_len(&sd->input_pkt_queue); |
3307 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
6e7676c1 | 3308 | if (skb_queue_len(&sd->input_pkt_queue)) { |
0a9627f2 | 3309 | enqueue: |
e36fa2f7 | 3310 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 3311 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 3312 | rps_unlock(sd); |
152102c7 | 3313 | local_irq_restore(flags); |
0a9627f2 TH |
3314 | return NET_RX_SUCCESS; |
3315 | } | |
3316 | ||
ebda37c2 ED |
3317 | /* Schedule NAPI for backlog device |
3318 | * We can use non atomic operation since we own the queue lock | |
3319 | */ | |
3320 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 3321 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 3322 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
3323 | } |
3324 | goto enqueue; | |
3325 | } | |
3326 | ||
dee42870 | 3327 | sd->dropped++; |
e36fa2f7 | 3328 | rps_unlock(sd); |
0a9627f2 | 3329 | |
0a9627f2 TH |
3330 | local_irq_restore(flags); |
3331 | ||
caf586e5 | 3332 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
3333 | kfree_skb(skb); |
3334 | return NET_RX_DROP; | |
3335 | } | |
1da177e4 | 3336 | |
ae78dbfa | 3337 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 3338 | { |
b0e28f1e | 3339 | int ret; |
1da177e4 | 3340 | |
588f0330 | 3341 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 3342 | |
cf66ba58 | 3343 | trace_netif_rx(skb); |
df334545 | 3344 | #ifdef CONFIG_RPS |
c5905afb | 3345 | if (static_key_false(&rps_needed)) { |
fec5e652 | 3346 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
3347 | int cpu; |
3348 | ||
cece1945 | 3349 | preempt_disable(); |
b0e28f1e | 3350 | rcu_read_lock(); |
fec5e652 TH |
3351 | |
3352 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
3353 | if (cpu < 0) |
3354 | cpu = smp_processor_id(); | |
fec5e652 TH |
3355 | |
3356 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3357 | ||
b0e28f1e | 3358 | rcu_read_unlock(); |
cece1945 | 3359 | preempt_enable(); |
adc9300e ED |
3360 | } else |
3361 | #endif | |
fec5e652 TH |
3362 | { |
3363 | unsigned int qtail; | |
3364 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); | |
3365 | put_cpu(); | |
3366 | } | |
b0e28f1e | 3367 | return ret; |
1da177e4 | 3368 | } |
ae78dbfa BH |
3369 | |
3370 | /** | |
3371 | * netif_rx - post buffer to the network code | |
3372 | * @skb: buffer to post | |
3373 | * | |
3374 | * This function receives a packet from a device driver and queues it for | |
3375 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
3376 | * may be dropped during processing for congestion control or by the | |
3377 | * protocol layers. | |
3378 | * | |
3379 | * return values: | |
3380 | * NET_RX_SUCCESS (no congestion) | |
3381 | * NET_RX_DROP (packet was dropped) | |
3382 | * | |
3383 | */ | |
3384 | ||
3385 | int netif_rx(struct sk_buff *skb) | |
3386 | { | |
3387 | trace_netif_rx_entry(skb); | |
3388 | ||
3389 | return netif_rx_internal(skb); | |
3390 | } | |
d1b19dff | 3391 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
3392 | |
3393 | int netif_rx_ni(struct sk_buff *skb) | |
3394 | { | |
3395 | int err; | |
3396 | ||
ae78dbfa BH |
3397 | trace_netif_rx_ni_entry(skb); |
3398 | ||
1da177e4 | 3399 | preempt_disable(); |
ae78dbfa | 3400 | err = netif_rx_internal(skb); |
1da177e4 LT |
3401 | if (local_softirq_pending()) |
3402 | do_softirq(); | |
3403 | preempt_enable(); | |
3404 | ||
3405 | return err; | |
3406 | } | |
1da177e4 LT |
3407 | EXPORT_SYMBOL(netif_rx_ni); |
3408 | ||
1da177e4 LT |
3409 | static void net_tx_action(struct softirq_action *h) |
3410 | { | |
903ceff7 | 3411 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
3412 | |
3413 | if (sd->completion_queue) { | |
3414 | struct sk_buff *clist; | |
3415 | ||
3416 | local_irq_disable(); | |
3417 | clist = sd->completion_queue; | |
3418 | sd->completion_queue = NULL; | |
3419 | local_irq_enable(); | |
3420 | ||
3421 | while (clist) { | |
3422 | struct sk_buff *skb = clist; | |
3423 | clist = clist->next; | |
3424 | ||
547b792c | 3425 | WARN_ON(atomic_read(&skb->users)); |
e6247027 ED |
3426 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
3427 | trace_consume_skb(skb); | |
3428 | else | |
3429 | trace_kfree_skb(skb, net_tx_action); | |
1da177e4 LT |
3430 | __kfree_skb(skb); |
3431 | } | |
3432 | } | |
3433 | ||
3434 | if (sd->output_queue) { | |
37437bb2 | 3435 | struct Qdisc *head; |
1da177e4 LT |
3436 | |
3437 | local_irq_disable(); | |
3438 | head = sd->output_queue; | |
3439 | sd->output_queue = NULL; | |
a9cbd588 | 3440 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
3441 | local_irq_enable(); |
3442 | ||
3443 | while (head) { | |
37437bb2 DM |
3444 | struct Qdisc *q = head; |
3445 | spinlock_t *root_lock; | |
3446 | ||
1da177e4 LT |
3447 | head = head->next_sched; |
3448 | ||
5fb66229 | 3449 | root_lock = qdisc_lock(q); |
37437bb2 | 3450 | if (spin_trylock(root_lock)) { |
4e857c58 | 3451 | smp_mb__before_atomic(); |
def82a1d JP |
3452 | clear_bit(__QDISC_STATE_SCHED, |
3453 | &q->state); | |
37437bb2 DM |
3454 | qdisc_run(q); |
3455 | spin_unlock(root_lock); | |
1da177e4 | 3456 | } else { |
195648bb | 3457 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
e8a83e10 | 3458 | &q->state)) { |
195648bb | 3459 | __netif_reschedule(q); |
e8a83e10 | 3460 | } else { |
4e857c58 | 3461 | smp_mb__before_atomic(); |
e8a83e10 JP |
3462 | clear_bit(__QDISC_STATE_SCHED, |
3463 | &q->state); | |
3464 | } | |
1da177e4 LT |
3465 | } |
3466 | } | |
3467 | } | |
3468 | } | |
3469 | ||
ab95bfe0 JP |
3470 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
3471 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) | |
da678292 MM |
3472 | /* This hook is defined here for ATM LANE */ |
3473 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
3474 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 3475 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 3476 | #endif |
1da177e4 | 3477 | |
1da177e4 LT |
3478 | #ifdef CONFIG_NET_CLS_ACT |
3479 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
3480 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
3481 | * a compare and 2 stores extra right now if we dont have it on | |
3482 | * but have CONFIG_NET_CLS_ACT | |
25985edc LDM |
3483 | * NOTE: This doesn't stop any functionality; if you dont have |
3484 | * the ingress scheduler, you just can't add policies on ingress. | |
1da177e4 LT |
3485 | * |
3486 | */ | |
24824a09 | 3487 | static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq) |
1da177e4 | 3488 | { |
1da177e4 | 3489 | struct net_device *dev = skb->dev; |
f697c3e8 | 3490 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
555353cf DM |
3491 | int result = TC_ACT_OK; |
3492 | struct Qdisc *q; | |
4ec93edb | 3493 | |
de384830 | 3494 | if (unlikely(MAX_RED_LOOP < ttl++)) { |
e87cc472 JP |
3495 | net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n", |
3496 | skb->skb_iif, dev->ifindex); | |
f697c3e8 HX |
3497 | return TC_ACT_SHOT; |
3498 | } | |
1da177e4 | 3499 | |
f697c3e8 HX |
3500 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
3501 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); | |
1da177e4 | 3502 | |
46e5da40 | 3503 | q = rcu_dereference(rxq->qdisc); |
8d50b53d | 3504 | if (q != &noop_qdisc) { |
83874000 | 3505 | spin_lock(qdisc_lock(q)); |
a9312ae8 DM |
3506 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
3507 | result = qdisc_enqueue_root(skb, q); | |
83874000 DM |
3508 | spin_unlock(qdisc_lock(q)); |
3509 | } | |
f697c3e8 HX |
3510 | |
3511 | return result; | |
3512 | } | |
86e65da9 | 3513 | |
f697c3e8 HX |
3514 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
3515 | struct packet_type **pt_prev, | |
3516 | int *ret, struct net_device *orig_dev) | |
3517 | { | |
24824a09 ED |
3518 | struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue); |
3519 | ||
46e5da40 | 3520 | if (!rxq || rcu_access_pointer(rxq->qdisc) == &noop_qdisc) |
f697c3e8 | 3521 | goto out; |
1da177e4 | 3522 | |
f697c3e8 HX |
3523 | if (*pt_prev) { |
3524 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
3525 | *pt_prev = NULL; | |
1da177e4 LT |
3526 | } |
3527 | ||
24824a09 | 3528 | switch (ing_filter(skb, rxq)) { |
f697c3e8 HX |
3529 | case TC_ACT_SHOT: |
3530 | case TC_ACT_STOLEN: | |
3531 | kfree_skb(skb); | |
3532 | return NULL; | |
3533 | } | |
3534 | ||
3535 | out: | |
3536 | skb->tc_verd = 0; | |
3537 | return skb; | |
1da177e4 LT |
3538 | } |
3539 | #endif | |
3540 | ||
ab95bfe0 JP |
3541 | /** |
3542 | * netdev_rx_handler_register - register receive handler | |
3543 | * @dev: device to register a handler for | |
3544 | * @rx_handler: receive handler to register | |
93e2c32b | 3545 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 3546 | * |
e227867f | 3547 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
3548 | * called from __netif_receive_skb. A negative errno code is returned |
3549 | * on a failure. | |
3550 | * | |
3551 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
3552 | * |
3553 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
3554 | */ |
3555 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
3556 | rx_handler_func_t *rx_handler, |
3557 | void *rx_handler_data) | |
ab95bfe0 JP |
3558 | { |
3559 | ASSERT_RTNL(); | |
3560 | ||
3561 | if (dev->rx_handler) | |
3562 | return -EBUSY; | |
3563 | ||
00cfec37 | 3564 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 3565 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
3566 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
3567 | ||
3568 | return 0; | |
3569 | } | |
3570 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
3571 | ||
3572 | /** | |
3573 | * netdev_rx_handler_unregister - unregister receive handler | |
3574 | * @dev: device to unregister a handler from | |
3575 | * | |
166ec369 | 3576 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
3577 | * |
3578 | * The caller must hold the rtnl_mutex. | |
3579 | */ | |
3580 | void netdev_rx_handler_unregister(struct net_device *dev) | |
3581 | { | |
3582 | ||
3583 | ASSERT_RTNL(); | |
a9b3cd7f | 3584 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
3585 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
3586 | * section has a guarantee to see a non NULL rx_handler_data | |
3587 | * as well. | |
3588 | */ | |
3589 | synchronize_net(); | |
a9b3cd7f | 3590 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
3591 | } |
3592 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
3593 | ||
b4b9e355 MG |
3594 | /* |
3595 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
3596 | * the special handling of PFMEMALLOC skbs. | |
3597 | */ | |
3598 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
3599 | { | |
3600 | switch (skb->protocol) { | |
2b8837ae JP |
3601 | case htons(ETH_P_ARP): |
3602 | case htons(ETH_P_IP): | |
3603 | case htons(ETH_P_IPV6): | |
3604 | case htons(ETH_P_8021Q): | |
3605 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
3606 | return true; |
3607 | default: | |
3608 | return false; | |
3609 | } | |
3610 | } | |
3611 | ||
9754e293 | 3612 | static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) |
1da177e4 LT |
3613 | { |
3614 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 3615 | rx_handler_func_t *rx_handler; |
f2ccd8fa | 3616 | struct net_device *orig_dev; |
63d8ea7f | 3617 | struct net_device *null_or_dev; |
8a4eb573 | 3618 | bool deliver_exact = false; |
1da177e4 | 3619 | int ret = NET_RX_DROP; |
252e3346 | 3620 | __be16 type; |
1da177e4 | 3621 | |
588f0330 | 3622 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 3623 | |
cf66ba58 | 3624 | trace_netif_receive_skb(skb); |
9b22ea56 | 3625 | |
cc9bd5ce | 3626 | orig_dev = skb->dev; |
8f903c70 | 3627 | |
c1d2bbe1 | 3628 | skb_reset_network_header(skb); |
fda55eca ED |
3629 | if (!skb_transport_header_was_set(skb)) |
3630 | skb_reset_transport_header(skb); | |
0b5c9db1 | 3631 | skb_reset_mac_len(skb); |
1da177e4 LT |
3632 | |
3633 | pt_prev = NULL; | |
3634 | ||
3635 | rcu_read_lock(); | |
3636 | ||
63d8ea7f | 3637 | another_round: |
b6858177 | 3638 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
3639 | |
3640 | __this_cpu_inc(softnet_data.processed); | |
3641 | ||
8ad227ff PM |
3642 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
3643 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
0d5501c1 | 3644 | skb = skb_vlan_untag(skb); |
bcc6d479 | 3645 | if (unlikely(!skb)) |
b4b9e355 | 3646 | goto unlock; |
bcc6d479 JP |
3647 | } |
3648 | ||
1da177e4 LT |
3649 | #ifdef CONFIG_NET_CLS_ACT |
3650 | if (skb->tc_verd & TC_NCLS) { | |
3651 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
3652 | goto ncls; | |
3653 | } | |
3654 | #endif | |
3655 | ||
9754e293 | 3656 | if (pfmemalloc) |
b4b9e355 MG |
3657 | goto skip_taps; |
3658 | ||
1da177e4 | 3659 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
63d8ea7f | 3660 | if (!ptype->dev || ptype->dev == skb->dev) { |
4ec93edb | 3661 | if (pt_prev) |
f2ccd8fa | 3662 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3663 | pt_prev = ptype; |
3664 | } | |
3665 | } | |
3666 | ||
b4b9e355 | 3667 | skip_taps: |
1da177e4 | 3668 | #ifdef CONFIG_NET_CLS_ACT |
f697c3e8 HX |
3669 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
3670 | if (!skb) | |
b4b9e355 | 3671 | goto unlock; |
1da177e4 LT |
3672 | ncls: |
3673 | #endif | |
3674 | ||
9754e293 | 3675 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
3676 | goto drop; |
3677 | ||
2425717b JF |
3678 | if (vlan_tx_tag_present(skb)) { |
3679 | if (pt_prev) { | |
3680 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3681 | pt_prev = NULL; | |
3682 | } | |
48cc32d3 | 3683 | if (vlan_do_receive(&skb)) |
2425717b JF |
3684 | goto another_round; |
3685 | else if (unlikely(!skb)) | |
b4b9e355 | 3686 | goto unlock; |
2425717b JF |
3687 | } |
3688 | ||
48cc32d3 | 3689 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
3690 | if (rx_handler) { |
3691 | if (pt_prev) { | |
3692 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3693 | pt_prev = NULL; | |
3694 | } | |
8a4eb573 JP |
3695 | switch (rx_handler(&skb)) { |
3696 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 3697 | ret = NET_RX_SUCCESS; |
b4b9e355 | 3698 | goto unlock; |
8a4eb573 | 3699 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 3700 | goto another_round; |
8a4eb573 JP |
3701 | case RX_HANDLER_EXACT: |
3702 | deliver_exact = true; | |
3703 | case RX_HANDLER_PASS: | |
3704 | break; | |
3705 | default: | |
3706 | BUG(); | |
3707 | } | |
ab95bfe0 | 3708 | } |
1da177e4 | 3709 | |
d4b812de ED |
3710 | if (unlikely(vlan_tx_tag_present(skb))) { |
3711 | if (vlan_tx_tag_get_id(skb)) | |
3712 | skb->pkt_type = PACKET_OTHERHOST; | |
3713 | /* Note: we might in the future use prio bits | |
3714 | * and set skb->priority like in vlan_do_receive() | |
3715 | * For the time being, just ignore Priority Code Point | |
3716 | */ | |
3717 | skb->vlan_tci = 0; | |
3718 | } | |
48cc32d3 | 3719 | |
63d8ea7f | 3720 | /* deliver only exact match when indicated */ |
8a4eb573 | 3721 | null_or_dev = deliver_exact ? skb->dev : NULL; |
1f3c8804 | 3722 | |
1da177e4 | 3723 | type = skb->protocol; |
82d8a867 PE |
3724 | list_for_each_entry_rcu(ptype, |
3725 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
63d8ea7f | 3726 | if (ptype->type == type && |
e3f48d37 JP |
3727 | (ptype->dev == null_or_dev || ptype->dev == skb->dev || |
3728 | ptype->dev == orig_dev)) { | |
4ec93edb | 3729 | if (pt_prev) |
f2ccd8fa | 3730 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3731 | pt_prev = ptype; |
3732 | } | |
3733 | } | |
3734 | ||
3735 | if (pt_prev) { | |
1080e512 | 3736 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
0e698bf6 | 3737 | goto drop; |
1080e512 MT |
3738 | else |
3739 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1da177e4 | 3740 | } else { |
b4b9e355 | 3741 | drop: |
caf586e5 | 3742 | atomic_long_inc(&skb->dev->rx_dropped); |
1da177e4 LT |
3743 | kfree_skb(skb); |
3744 | /* Jamal, now you will not able to escape explaining | |
3745 | * me how you were going to use this. :-) | |
3746 | */ | |
3747 | ret = NET_RX_DROP; | |
3748 | } | |
3749 | ||
b4b9e355 | 3750 | unlock: |
1da177e4 | 3751 | rcu_read_unlock(); |
9754e293 DM |
3752 | return ret; |
3753 | } | |
3754 | ||
3755 | static int __netif_receive_skb(struct sk_buff *skb) | |
3756 | { | |
3757 | int ret; | |
3758 | ||
3759 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
3760 | unsigned long pflags = current->flags; | |
3761 | ||
3762 | /* | |
3763 | * PFMEMALLOC skbs are special, they should | |
3764 | * - be delivered to SOCK_MEMALLOC sockets only | |
3765 | * - stay away from userspace | |
3766 | * - have bounded memory usage | |
3767 | * | |
3768 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
3769 | * context down to all allocation sites. | |
3770 | */ | |
3771 | current->flags |= PF_MEMALLOC; | |
3772 | ret = __netif_receive_skb_core(skb, true); | |
3773 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
3774 | } else | |
3775 | ret = __netif_receive_skb_core(skb, false); | |
3776 | ||
1da177e4 LT |
3777 | return ret; |
3778 | } | |
0a9627f2 | 3779 | |
ae78dbfa | 3780 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 3781 | { |
588f0330 | 3782 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 3783 | |
c1f19b51 RC |
3784 | if (skb_defer_rx_timestamp(skb)) |
3785 | return NET_RX_SUCCESS; | |
3786 | ||
df334545 | 3787 | #ifdef CONFIG_RPS |
c5905afb | 3788 | if (static_key_false(&rps_needed)) { |
3b098e2d ED |
3789 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
3790 | int cpu, ret; | |
fec5e652 | 3791 | |
3b098e2d ED |
3792 | rcu_read_lock(); |
3793 | ||
3794 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
0a9627f2 | 3795 | |
3b098e2d ED |
3796 | if (cpu >= 0) { |
3797 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3798 | rcu_read_unlock(); | |
adc9300e | 3799 | return ret; |
3b098e2d | 3800 | } |
adc9300e | 3801 | rcu_read_unlock(); |
fec5e652 | 3802 | } |
1e94d72f | 3803 | #endif |
adc9300e | 3804 | return __netif_receive_skb(skb); |
0a9627f2 | 3805 | } |
ae78dbfa BH |
3806 | |
3807 | /** | |
3808 | * netif_receive_skb - process receive buffer from network | |
3809 | * @skb: buffer to process | |
3810 | * | |
3811 | * netif_receive_skb() is the main receive data processing function. | |
3812 | * It always succeeds. The buffer may be dropped during processing | |
3813 | * for congestion control or by the protocol layers. | |
3814 | * | |
3815 | * This function may only be called from softirq context and interrupts | |
3816 | * should be enabled. | |
3817 | * | |
3818 | * Return values (usually ignored): | |
3819 | * NET_RX_SUCCESS: no congestion | |
3820 | * NET_RX_DROP: packet was dropped | |
3821 | */ | |
3822 | int netif_receive_skb(struct sk_buff *skb) | |
3823 | { | |
3824 | trace_netif_receive_skb_entry(skb); | |
3825 | ||
3826 | return netif_receive_skb_internal(skb); | |
3827 | } | |
d1b19dff | 3828 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 3829 | |
88751275 ED |
3830 | /* Network device is going away, flush any packets still pending |
3831 | * Called with irqs disabled. | |
3832 | */ | |
152102c7 | 3833 | static void flush_backlog(void *arg) |
6e583ce5 | 3834 | { |
152102c7 | 3835 | struct net_device *dev = arg; |
903ceff7 | 3836 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
6e583ce5 SH |
3837 | struct sk_buff *skb, *tmp; |
3838 | ||
e36fa2f7 | 3839 | rps_lock(sd); |
6e7676c1 | 3840 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
6e583ce5 | 3841 | if (skb->dev == dev) { |
e36fa2f7 | 3842 | __skb_unlink(skb, &sd->input_pkt_queue); |
6e583ce5 | 3843 | kfree_skb(skb); |
76cc8b13 | 3844 | input_queue_head_incr(sd); |
6e583ce5 | 3845 | } |
6e7676c1 | 3846 | } |
e36fa2f7 | 3847 | rps_unlock(sd); |
6e7676c1 CG |
3848 | |
3849 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
3850 | if (skb->dev == dev) { | |
3851 | __skb_unlink(skb, &sd->process_queue); | |
3852 | kfree_skb(skb); | |
76cc8b13 | 3853 | input_queue_head_incr(sd); |
6e7676c1 CG |
3854 | } |
3855 | } | |
6e583ce5 SH |
3856 | } |
3857 | ||
d565b0a1 HX |
3858 | static int napi_gro_complete(struct sk_buff *skb) |
3859 | { | |
22061d80 | 3860 | struct packet_offload *ptype; |
d565b0a1 | 3861 | __be16 type = skb->protocol; |
22061d80 | 3862 | struct list_head *head = &offload_base; |
d565b0a1 HX |
3863 | int err = -ENOENT; |
3864 | ||
c3c7c254 ED |
3865 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
3866 | ||
fc59f9a3 HX |
3867 | if (NAPI_GRO_CB(skb)->count == 1) { |
3868 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 3869 | goto out; |
fc59f9a3 | 3870 | } |
d565b0a1 HX |
3871 | |
3872 | rcu_read_lock(); | |
3873 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 3874 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
3875 | continue; |
3876 | ||
299603e8 | 3877 | err = ptype->callbacks.gro_complete(skb, 0); |
d565b0a1 HX |
3878 | break; |
3879 | } | |
3880 | rcu_read_unlock(); | |
3881 | ||
3882 | if (err) { | |
3883 | WARN_ON(&ptype->list == head); | |
3884 | kfree_skb(skb); | |
3885 | return NET_RX_SUCCESS; | |
3886 | } | |
3887 | ||
3888 | out: | |
ae78dbfa | 3889 | return netif_receive_skb_internal(skb); |
d565b0a1 HX |
3890 | } |
3891 | ||
2e71a6f8 ED |
3892 | /* napi->gro_list contains packets ordered by age. |
3893 | * youngest packets at the head of it. | |
3894 | * Complete skbs in reverse order to reduce latencies. | |
3895 | */ | |
3896 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
d565b0a1 | 3897 | { |
2e71a6f8 | 3898 | struct sk_buff *skb, *prev = NULL; |
d565b0a1 | 3899 | |
2e71a6f8 ED |
3900 | /* scan list and build reverse chain */ |
3901 | for (skb = napi->gro_list; skb != NULL; skb = skb->next) { | |
3902 | skb->prev = prev; | |
3903 | prev = skb; | |
3904 | } | |
3905 | ||
3906 | for (skb = prev; skb; skb = prev) { | |
d565b0a1 | 3907 | skb->next = NULL; |
2e71a6f8 ED |
3908 | |
3909 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) | |
3910 | return; | |
3911 | ||
3912 | prev = skb->prev; | |
d565b0a1 | 3913 | napi_gro_complete(skb); |
2e71a6f8 | 3914 | napi->gro_count--; |
d565b0a1 HX |
3915 | } |
3916 | ||
3917 | napi->gro_list = NULL; | |
3918 | } | |
86cac58b | 3919 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 3920 | |
89c5fa33 ED |
3921 | static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb) |
3922 | { | |
3923 | struct sk_buff *p; | |
3924 | unsigned int maclen = skb->dev->hard_header_len; | |
0b4cec8c | 3925 | u32 hash = skb_get_hash_raw(skb); |
89c5fa33 ED |
3926 | |
3927 | for (p = napi->gro_list; p; p = p->next) { | |
3928 | unsigned long diffs; | |
3929 | ||
0b4cec8c TH |
3930 | NAPI_GRO_CB(p)->flush = 0; |
3931 | ||
3932 | if (hash != skb_get_hash_raw(p)) { | |
3933 | NAPI_GRO_CB(p)->same_flow = 0; | |
3934 | continue; | |
3935 | } | |
3936 | ||
89c5fa33 ED |
3937 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
3938 | diffs |= p->vlan_tci ^ skb->vlan_tci; | |
3939 | if (maclen == ETH_HLEN) | |
3940 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 3941 | skb_mac_header(skb)); |
89c5fa33 ED |
3942 | else if (!diffs) |
3943 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 3944 | skb_mac_header(skb), |
89c5fa33 ED |
3945 | maclen); |
3946 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
89c5fa33 ED |
3947 | } |
3948 | } | |
3949 | ||
299603e8 JC |
3950 | static void skb_gro_reset_offset(struct sk_buff *skb) |
3951 | { | |
3952 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
3953 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
3954 | ||
3955 | NAPI_GRO_CB(skb)->data_offset = 0; | |
3956 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
3957 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
3958 | ||
3959 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && | |
3960 | pinfo->nr_frags && | |
3961 | !PageHighMem(skb_frag_page(frag0))) { | |
3962 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); | |
3963 | NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0); | |
89c5fa33 ED |
3964 | } |
3965 | } | |
3966 | ||
a50e233c ED |
3967 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
3968 | { | |
3969 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
3970 | ||
3971 | BUG_ON(skb->end - skb->tail < grow); | |
3972 | ||
3973 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
3974 | ||
3975 | skb->data_len -= grow; | |
3976 | skb->tail += grow; | |
3977 | ||
3978 | pinfo->frags[0].page_offset += grow; | |
3979 | skb_frag_size_sub(&pinfo->frags[0], grow); | |
3980 | ||
3981 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
3982 | skb_frag_unref(skb, 0); | |
3983 | memmove(pinfo->frags, pinfo->frags + 1, | |
3984 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
3985 | } | |
3986 | } | |
3987 | ||
bb728820 | 3988 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 HX |
3989 | { |
3990 | struct sk_buff **pp = NULL; | |
22061d80 | 3991 | struct packet_offload *ptype; |
d565b0a1 | 3992 | __be16 type = skb->protocol; |
22061d80 | 3993 | struct list_head *head = &offload_base; |
0da2afd5 | 3994 | int same_flow; |
5b252f0c | 3995 | enum gro_result ret; |
a50e233c | 3996 | int grow; |
d565b0a1 | 3997 | |
9c62a68d | 3998 | if (!(skb->dev->features & NETIF_F_GRO)) |
d565b0a1 HX |
3999 | goto normal; |
4000 | ||
5a212329 | 4001 | if (skb_is_gso(skb) || skb_has_frag_list(skb) || skb->csum_bad) |
f17f5c91 HX |
4002 | goto normal; |
4003 | ||
89c5fa33 ED |
4004 | gro_list_prepare(napi, skb); |
4005 | ||
d565b0a1 HX |
4006 | rcu_read_lock(); |
4007 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 4008 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
4009 | continue; |
4010 | ||
86911732 | 4011 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 4012 | skb_reset_mac_len(skb); |
d565b0a1 HX |
4013 | NAPI_GRO_CB(skb)->same_flow = 0; |
4014 | NAPI_GRO_CB(skb)->flush = 0; | |
5d38a079 | 4015 | NAPI_GRO_CB(skb)->free = 0; |
b582ef09 | 4016 | NAPI_GRO_CB(skb)->udp_mark = 0; |
d565b0a1 | 4017 | |
662880f4 TH |
4018 | /* Setup for GRO checksum validation */ |
4019 | switch (skb->ip_summed) { | |
4020 | case CHECKSUM_COMPLETE: | |
4021 | NAPI_GRO_CB(skb)->csum = skb->csum; | |
4022 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
4023 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
4024 | break; | |
4025 | case CHECKSUM_UNNECESSARY: | |
4026 | NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1; | |
4027 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
4028 | break; | |
4029 | default: | |
4030 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
4031 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
4032 | } | |
d565b0a1 | 4033 | |
f191a1d1 | 4034 | pp = ptype->callbacks.gro_receive(&napi->gro_list, skb); |
d565b0a1 HX |
4035 | break; |
4036 | } | |
4037 | rcu_read_unlock(); | |
4038 | ||
4039 | if (&ptype->list == head) | |
4040 | goto normal; | |
4041 | ||
0da2afd5 | 4042 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 4043 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 4044 | |
d565b0a1 HX |
4045 | if (pp) { |
4046 | struct sk_buff *nskb = *pp; | |
4047 | ||
4048 | *pp = nskb->next; | |
4049 | nskb->next = NULL; | |
4050 | napi_gro_complete(nskb); | |
4ae5544f | 4051 | napi->gro_count--; |
d565b0a1 HX |
4052 | } |
4053 | ||
0da2afd5 | 4054 | if (same_flow) |
d565b0a1 HX |
4055 | goto ok; |
4056 | ||
600adc18 | 4057 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 4058 | goto normal; |
d565b0a1 | 4059 | |
600adc18 ED |
4060 | if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) { |
4061 | struct sk_buff *nskb = napi->gro_list; | |
4062 | ||
4063 | /* locate the end of the list to select the 'oldest' flow */ | |
4064 | while (nskb->next) { | |
4065 | pp = &nskb->next; | |
4066 | nskb = *pp; | |
4067 | } | |
4068 | *pp = NULL; | |
4069 | nskb->next = NULL; | |
4070 | napi_gro_complete(nskb); | |
4071 | } else { | |
4072 | napi->gro_count++; | |
4073 | } | |
d565b0a1 | 4074 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 4075 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 4076 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 4077 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
d565b0a1 HX |
4078 | skb->next = napi->gro_list; |
4079 | napi->gro_list = skb; | |
5d0d9be8 | 4080 | ret = GRO_HELD; |
d565b0a1 | 4081 | |
ad0f9904 | 4082 | pull: |
a50e233c ED |
4083 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
4084 | if (grow > 0) | |
4085 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 4086 | ok: |
5d0d9be8 | 4087 | return ret; |
d565b0a1 HX |
4088 | |
4089 | normal: | |
ad0f9904 HX |
4090 | ret = GRO_NORMAL; |
4091 | goto pull; | |
5d38a079 | 4092 | } |
96e93eab | 4093 | |
bf5a755f JC |
4094 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
4095 | { | |
4096 | struct list_head *offload_head = &offload_base; | |
4097 | struct packet_offload *ptype; | |
4098 | ||
4099 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4100 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
4101 | continue; | |
4102 | return ptype; | |
4103 | } | |
4104 | return NULL; | |
4105 | } | |
e27a2f83 | 4106 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
4107 | |
4108 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
4109 | { | |
4110 | struct list_head *offload_head = &offload_base; | |
4111 | struct packet_offload *ptype; | |
4112 | ||
4113 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4114 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
4115 | continue; | |
4116 | return ptype; | |
4117 | } | |
4118 | return NULL; | |
4119 | } | |
e27a2f83 | 4120 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 4121 | |
bb728820 | 4122 | static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 4123 | { |
5d0d9be8 HX |
4124 | switch (ret) { |
4125 | case GRO_NORMAL: | |
ae78dbfa | 4126 | if (netif_receive_skb_internal(skb)) |
c7c4b3b6 BH |
4127 | ret = GRO_DROP; |
4128 | break; | |
5d38a079 | 4129 | |
5d0d9be8 | 4130 | case GRO_DROP: |
5d38a079 HX |
4131 | kfree_skb(skb); |
4132 | break; | |
5b252f0c | 4133 | |
daa86548 | 4134 | case GRO_MERGED_FREE: |
d7e8883c ED |
4135 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
4136 | kmem_cache_free(skbuff_head_cache, skb); | |
4137 | else | |
4138 | __kfree_skb(skb); | |
daa86548 ED |
4139 | break; |
4140 | ||
5b252f0c BH |
4141 | case GRO_HELD: |
4142 | case GRO_MERGED: | |
4143 | break; | |
5d38a079 HX |
4144 | } |
4145 | ||
c7c4b3b6 | 4146 | return ret; |
5d0d9be8 | 4147 | } |
5d0d9be8 | 4148 | |
c7c4b3b6 | 4149 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 4150 | { |
ae78dbfa | 4151 | trace_napi_gro_receive_entry(skb); |
86911732 | 4152 | |
a50e233c ED |
4153 | skb_gro_reset_offset(skb); |
4154 | ||
89c5fa33 | 4155 | return napi_skb_finish(dev_gro_receive(napi, skb), skb); |
d565b0a1 HX |
4156 | } |
4157 | EXPORT_SYMBOL(napi_gro_receive); | |
4158 | ||
d0c2b0d2 | 4159 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 4160 | { |
93a35f59 ED |
4161 | if (unlikely(skb->pfmemalloc)) { |
4162 | consume_skb(skb); | |
4163 | return; | |
4164 | } | |
96e93eab | 4165 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
4166 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
4167 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
3701e513 | 4168 | skb->vlan_tci = 0; |
66c46d74 | 4169 | skb->dev = napi->dev; |
6d152e23 | 4170 | skb->skb_iif = 0; |
c3caf119 JC |
4171 | skb->encapsulation = 0; |
4172 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 4173 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
96e93eab HX |
4174 | |
4175 | napi->skb = skb; | |
4176 | } | |
96e93eab | 4177 | |
76620aaf | 4178 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 4179 | { |
5d38a079 | 4180 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
4181 | |
4182 | if (!skb) { | |
89d71a66 | 4183 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
84b9cd63 | 4184 | napi->skb = skb; |
80595d59 | 4185 | } |
96e93eab HX |
4186 | return skb; |
4187 | } | |
76620aaf | 4188 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 4189 | |
a50e233c ED |
4190 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
4191 | struct sk_buff *skb, | |
4192 | gro_result_t ret) | |
96e93eab | 4193 | { |
5d0d9be8 HX |
4194 | switch (ret) { |
4195 | case GRO_NORMAL: | |
a50e233c ED |
4196 | case GRO_HELD: |
4197 | __skb_push(skb, ETH_HLEN); | |
4198 | skb->protocol = eth_type_trans(skb, skb->dev); | |
4199 | if (ret == GRO_NORMAL && netif_receive_skb_internal(skb)) | |
c7c4b3b6 | 4200 | ret = GRO_DROP; |
86911732 | 4201 | break; |
5d38a079 | 4202 | |
5d0d9be8 | 4203 | case GRO_DROP: |
5d0d9be8 HX |
4204 | case GRO_MERGED_FREE: |
4205 | napi_reuse_skb(napi, skb); | |
4206 | break; | |
5b252f0c BH |
4207 | |
4208 | case GRO_MERGED: | |
4209 | break; | |
5d0d9be8 | 4210 | } |
5d38a079 | 4211 | |
c7c4b3b6 | 4212 | return ret; |
5d38a079 | 4213 | } |
5d0d9be8 | 4214 | |
a50e233c ED |
4215 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
4216 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
4217 | * We copy ethernet header into skb->data to have a common layout. | |
4218 | */ | |
4adb9c4a | 4219 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
4220 | { |
4221 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
4222 | const struct ethhdr *eth; |
4223 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
4224 | |
4225 | napi->skb = NULL; | |
4226 | ||
a50e233c ED |
4227 | skb_reset_mac_header(skb); |
4228 | skb_gro_reset_offset(skb); | |
4229 | ||
4230 | eth = skb_gro_header_fast(skb, 0); | |
4231 | if (unlikely(skb_gro_header_hard(skb, hlen))) { | |
4232 | eth = skb_gro_header_slow(skb, hlen, 0); | |
4233 | if (unlikely(!eth)) { | |
4234 | napi_reuse_skb(napi, skb); | |
4235 | return NULL; | |
4236 | } | |
4237 | } else { | |
4238 | gro_pull_from_frag0(skb, hlen); | |
4239 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
4240 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 4241 | } |
a50e233c ED |
4242 | __skb_pull(skb, hlen); |
4243 | ||
4244 | /* | |
4245 | * This works because the only protocols we care about don't require | |
4246 | * special handling. | |
4247 | * We'll fix it up properly in napi_frags_finish() | |
4248 | */ | |
4249 | skb->protocol = eth->h_proto; | |
76620aaf | 4250 | |
76620aaf HX |
4251 | return skb; |
4252 | } | |
76620aaf | 4253 | |
c7c4b3b6 | 4254 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 4255 | { |
76620aaf | 4256 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
4257 | |
4258 | if (!skb) | |
c7c4b3b6 | 4259 | return GRO_DROP; |
5d0d9be8 | 4260 | |
ae78dbfa BH |
4261 | trace_napi_gro_frags_entry(skb); |
4262 | ||
89c5fa33 | 4263 | return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
5d0d9be8 | 4264 | } |
5d38a079 HX |
4265 | EXPORT_SYMBOL(napi_gro_frags); |
4266 | ||
573e8fca TH |
4267 | /* Compute the checksum from gro_offset and return the folded value |
4268 | * after adding in any pseudo checksum. | |
4269 | */ | |
4270 | __sum16 __skb_gro_checksum_complete(struct sk_buff *skb) | |
4271 | { | |
4272 | __wsum wsum; | |
4273 | __sum16 sum; | |
4274 | ||
4275 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0); | |
4276 | ||
4277 | /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */ | |
4278 | sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum)); | |
4279 | if (likely(!sum)) { | |
4280 | if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && | |
4281 | !skb->csum_complete_sw) | |
4282 | netdev_rx_csum_fault(skb->dev); | |
4283 | } | |
4284 | ||
4285 | NAPI_GRO_CB(skb)->csum = wsum; | |
4286 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
4287 | ||
4288 | return sum; | |
4289 | } | |
4290 | EXPORT_SYMBOL(__skb_gro_checksum_complete); | |
4291 | ||
e326bed2 | 4292 | /* |
855abcf0 | 4293 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
4294 | * Note: called with local irq disabled, but exits with local irq enabled. |
4295 | */ | |
4296 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
4297 | { | |
4298 | #ifdef CONFIG_RPS | |
4299 | struct softnet_data *remsd = sd->rps_ipi_list; | |
4300 | ||
4301 | if (remsd) { | |
4302 | sd->rps_ipi_list = NULL; | |
4303 | ||
4304 | local_irq_enable(); | |
4305 | ||
4306 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
4307 | while (remsd) { | |
4308 | struct softnet_data *next = remsd->rps_ipi_next; | |
4309 | ||
4310 | if (cpu_online(remsd->cpu)) | |
c46fff2a | 4311 | smp_call_function_single_async(remsd->cpu, |
fce8ad15 | 4312 | &remsd->csd); |
e326bed2 ED |
4313 | remsd = next; |
4314 | } | |
4315 | } else | |
4316 | #endif | |
4317 | local_irq_enable(); | |
4318 | } | |
4319 | ||
d75b1ade ED |
4320 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
4321 | { | |
4322 | #ifdef CONFIG_RPS | |
4323 | return sd->rps_ipi_list != NULL; | |
4324 | #else | |
4325 | return false; | |
4326 | #endif | |
4327 | } | |
4328 | ||
bea3348e | 4329 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 LT |
4330 | { |
4331 | int work = 0; | |
eecfd7c4 | 4332 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
1da177e4 | 4333 | |
e326bed2 ED |
4334 | /* Check if we have pending ipi, its better to send them now, |
4335 | * not waiting net_rx_action() end. | |
4336 | */ | |
d75b1ade | 4337 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
4338 | local_irq_disable(); |
4339 | net_rps_action_and_irq_enable(sd); | |
4340 | } | |
d75b1ade | 4341 | |
bea3348e | 4342 | napi->weight = weight_p; |
6e7676c1 | 4343 | local_irq_disable(); |
11ef7a89 | 4344 | while (1) { |
1da177e4 | 4345 | struct sk_buff *skb; |
6e7676c1 CG |
4346 | |
4347 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
4348 | local_irq_enable(); | |
4349 | __netif_receive_skb(skb); | |
6e7676c1 | 4350 | local_irq_disable(); |
76cc8b13 TH |
4351 | input_queue_head_incr(sd); |
4352 | if (++work >= quota) { | |
4353 | local_irq_enable(); | |
4354 | return work; | |
4355 | } | |
6e7676c1 | 4356 | } |
1da177e4 | 4357 | |
e36fa2f7 | 4358 | rps_lock(sd); |
11ef7a89 | 4359 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
4360 | /* |
4361 | * Inline a custom version of __napi_complete(). | |
4362 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
4363 | * and NAPI_STATE_SCHED is the only possible flag set |
4364 | * on backlog. | |
4365 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
4366 | * and we dont need an smp_mb() memory barrier. |
4367 | */ | |
eecfd7c4 | 4368 | napi->state = 0; |
11ef7a89 | 4369 | rps_unlock(sd); |
eecfd7c4 | 4370 | |
11ef7a89 | 4371 | break; |
bea3348e | 4372 | } |
11ef7a89 TH |
4373 | |
4374 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
4375 | &sd->process_queue); | |
e36fa2f7 | 4376 | rps_unlock(sd); |
6e7676c1 CG |
4377 | } |
4378 | local_irq_enable(); | |
1da177e4 | 4379 | |
bea3348e SH |
4380 | return work; |
4381 | } | |
1da177e4 | 4382 | |
bea3348e SH |
4383 | /** |
4384 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 4385 | * @n: entry to schedule |
bea3348e | 4386 | * |
bc9ad166 ED |
4387 | * The entry's receive function will be scheduled to run. |
4388 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 4389 | */ |
b5606c2d | 4390 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
4391 | { |
4392 | unsigned long flags; | |
1da177e4 | 4393 | |
bea3348e | 4394 | local_irq_save(flags); |
903ceff7 | 4395 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 4396 | local_irq_restore(flags); |
1da177e4 | 4397 | } |
bea3348e SH |
4398 | EXPORT_SYMBOL(__napi_schedule); |
4399 | ||
bc9ad166 ED |
4400 | /** |
4401 | * __napi_schedule_irqoff - schedule for receive | |
4402 | * @n: entry to schedule | |
4403 | * | |
4404 | * Variant of __napi_schedule() assuming hard irqs are masked | |
4405 | */ | |
4406 | void __napi_schedule_irqoff(struct napi_struct *n) | |
4407 | { | |
4408 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
4409 | } | |
4410 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
4411 | ||
d565b0a1 HX |
4412 | void __napi_complete(struct napi_struct *n) |
4413 | { | |
4414 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); | |
4415 | BUG_ON(n->gro_list); | |
4416 | ||
d75b1ade | 4417 | list_del_init(&n->poll_list); |
4e857c58 | 4418 | smp_mb__before_atomic(); |
d565b0a1 HX |
4419 | clear_bit(NAPI_STATE_SCHED, &n->state); |
4420 | } | |
4421 | EXPORT_SYMBOL(__napi_complete); | |
4422 | ||
4423 | void napi_complete(struct napi_struct *n) | |
4424 | { | |
4425 | unsigned long flags; | |
4426 | ||
4427 | /* | |
4428 | * don't let napi dequeue from the cpu poll list | |
4429 | * just in case its running on a different cpu | |
4430 | */ | |
4431 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) | |
4432 | return; | |
4433 | ||
2e71a6f8 | 4434 | napi_gro_flush(n, false); |
d75b1ade ED |
4435 | |
4436 | if (likely(list_empty(&n->poll_list))) { | |
4437 | WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED, &n->state)); | |
4438 | } else { | |
4439 | /* If n->poll_list is not empty, we need to mask irqs */ | |
4440 | local_irq_save(flags); | |
4441 | __napi_complete(n); | |
4442 | local_irq_restore(flags); | |
4443 | } | |
d565b0a1 HX |
4444 | } |
4445 | EXPORT_SYMBOL(napi_complete); | |
4446 | ||
af12fa6e ET |
4447 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
4448 | struct napi_struct *napi_by_id(unsigned int napi_id) | |
4449 | { | |
4450 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
4451 | struct napi_struct *napi; | |
4452 | ||
4453 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
4454 | if (napi->napi_id == napi_id) | |
4455 | return napi; | |
4456 | ||
4457 | return NULL; | |
4458 | } | |
4459 | EXPORT_SYMBOL_GPL(napi_by_id); | |
4460 | ||
4461 | void napi_hash_add(struct napi_struct *napi) | |
4462 | { | |
4463 | if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) { | |
4464 | ||
4465 | spin_lock(&napi_hash_lock); | |
4466 | ||
4467 | /* 0 is not a valid id, we also skip an id that is taken | |
4468 | * we expect both events to be extremely rare | |
4469 | */ | |
4470 | napi->napi_id = 0; | |
4471 | while (!napi->napi_id) { | |
4472 | napi->napi_id = ++napi_gen_id; | |
4473 | if (napi_by_id(napi->napi_id)) | |
4474 | napi->napi_id = 0; | |
4475 | } | |
4476 | ||
4477 | hlist_add_head_rcu(&napi->napi_hash_node, | |
4478 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
4479 | ||
4480 | spin_unlock(&napi_hash_lock); | |
4481 | } | |
4482 | } | |
4483 | EXPORT_SYMBOL_GPL(napi_hash_add); | |
4484 | ||
4485 | /* Warning : caller is responsible to make sure rcu grace period | |
4486 | * is respected before freeing memory containing @napi | |
4487 | */ | |
4488 | void napi_hash_del(struct napi_struct *napi) | |
4489 | { | |
4490 | spin_lock(&napi_hash_lock); | |
4491 | ||
4492 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) | |
4493 | hlist_del_rcu(&napi->napi_hash_node); | |
4494 | ||
4495 | spin_unlock(&napi_hash_lock); | |
4496 | } | |
4497 | EXPORT_SYMBOL_GPL(napi_hash_del); | |
4498 | ||
d565b0a1 HX |
4499 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
4500 | int (*poll)(struct napi_struct *, int), int weight) | |
4501 | { | |
4502 | INIT_LIST_HEAD(&napi->poll_list); | |
4ae5544f | 4503 | napi->gro_count = 0; |
d565b0a1 | 4504 | napi->gro_list = NULL; |
5d38a079 | 4505 | napi->skb = NULL; |
d565b0a1 | 4506 | napi->poll = poll; |
82dc3c63 ED |
4507 | if (weight > NAPI_POLL_WEIGHT) |
4508 | pr_err_once("netif_napi_add() called with weight %d on device %s\n", | |
4509 | weight, dev->name); | |
d565b0a1 HX |
4510 | napi->weight = weight; |
4511 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 4512 | napi->dev = dev; |
5d38a079 | 4513 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
4514 | spin_lock_init(&napi->poll_lock); |
4515 | napi->poll_owner = -1; | |
4516 | #endif | |
4517 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
4518 | } | |
4519 | EXPORT_SYMBOL(netif_napi_add); | |
4520 | ||
4521 | void netif_napi_del(struct napi_struct *napi) | |
4522 | { | |
d7b06636 | 4523 | list_del_init(&napi->dev_list); |
76620aaf | 4524 | napi_free_frags(napi); |
d565b0a1 | 4525 | |
289dccbe | 4526 | kfree_skb_list(napi->gro_list); |
d565b0a1 | 4527 | napi->gro_list = NULL; |
4ae5544f | 4528 | napi->gro_count = 0; |
d565b0a1 HX |
4529 | } |
4530 | EXPORT_SYMBOL(netif_napi_del); | |
4531 | ||
1da177e4 LT |
4532 | static void net_rx_action(struct softirq_action *h) |
4533 | { | |
903ceff7 | 4534 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
24f8b238 | 4535 | unsigned long time_limit = jiffies + 2; |
51b0bded | 4536 | int budget = netdev_budget; |
d75b1ade ED |
4537 | LIST_HEAD(list); |
4538 | LIST_HEAD(repoll); | |
53fb95d3 MM |
4539 | void *have; |
4540 | ||
1da177e4 | 4541 | local_irq_disable(); |
d75b1ade ED |
4542 | list_splice_init(&sd->poll_list, &list); |
4543 | local_irq_enable(); | |
1da177e4 | 4544 | |
d75b1ade | 4545 | while (!list_empty(&list)) { |
bea3348e SH |
4546 | struct napi_struct *n; |
4547 | int work, weight; | |
1da177e4 | 4548 | |
d75b1ade | 4549 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
4550 | * Allow this to run for 2 jiffies since which will allow |
4551 | * an average latency of 1.5/HZ. | |
bea3348e | 4552 | */ |
d1f41b67 | 4553 | if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit))) |
1da177e4 LT |
4554 | goto softnet_break; |
4555 | ||
1da177e4 | 4556 | |
d75b1ade ED |
4557 | n = list_first_entry(&list, struct napi_struct, poll_list); |
4558 | list_del_init(&n->poll_list); | |
1da177e4 | 4559 | |
bea3348e SH |
4560 | have = netpoll_poll_lock(n); |
4561 | ||
4562 | weight = n->weight; | |
4563 | ||
0a7606c1 DM |
4564 | /* This NAPI_STATE_SCHED test is for avoiding a race |
4565 | * with netpoll's poll_napi(). Only the entity which | |
4566 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
4567 | * actually make the ->poll() call. Therefore we avoid | |
25985edc | 4568 | * accidentally calling ->poll() when NAPI is not scheduled. |
0a7606c1 DM |
4569 | */ |
4570 | work = 0; | |
4ea7e386 | 4571 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
0a7606c1 | 4572 | work = n->poll(n, weight); |
4ea7e386 NH |
4573 | trace_napi_poll(n); |
4574 | } | |
bea3348e SH |
4575 | |
4576 | WARN_ON_ONCE(work > weight); | |
4577 | ||
4578 | budget -= work; | |
4579 | ||
bea3348e SH |
4580 | /* Drivers must not modify the NAPI state if they |
4581 | * consume the entire weight. In such cases this code | |
4582 | * still "owns" the NAPI instance and therefore can | |
4583 | * move the instance around on the list at-will. | |
4584 | */ | |
fed17f30 | 4585 | if (unlikely(work == weight)) { |
ff780cd8 | 4586 | if (unlikely(napi_disable_pending(n))) { |
ff780cd8 | 4587 | napi_complete(n); |
2e71a6f8 ED |
4588 | } else { |
4589 | if (n->gro_list) { | |
4590 | /* flush too old packets | |
4591 | * If HZ < 1000, flush all packets. | |
4592 | */ | |
2e71a6f8 | 4593 | napi_gro_flush(n, HZ >= 1000); |
2e71a6f8 | 4594 | } |
d75b1ade | 4595 | list_add_tail(&n->poll_list, &repoll); |
2e71a6f8 | 4596 | } |
fed17f30 | 4597 | } |
bea3348e SH |
4598 | |
4599 | netpoll_poll_unlock(have); | |
1da177e4 | 4600 | } |
d75b1ade ED |
4601 | |
4602 | if (!sd_has_rps_ipi_waiting(sd) && | |
4603 | list_empty(&list) && | |
4604 | list_empty(&repoll)) | |
4605 | return; | |
1da177e4 | 4606 | out: |
d75b1ade ED |
4607 | local_irq_disable(); |
4608 | ||
4609 | list_splice_tail_init(&sd->poll_list, &list); | |
4610 | list_splice_tail(&repoll, &list); | |
4611 | list_splice(&list, &sd->poll_list); | |
4612 | if (!list_empty(&sd->poll_list)) | |
4613 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4614 | ||
e326bed2 | 4615 | net_rps_action_and_irq_enable(sd); |
0a9627f2 | 4616 | |
1da177e4 LT |
4617 | return; |
4618 | ||
4619 | softnet_break: | |
dee42870 | 4620 | sd->time_squeeze++; |
1da177e4 LT |
4621 | goto out; |
4622 | } | |
4623 | ||
aa9d8560 | 4624 | struct netdev_adjacent { |
9ff162a8 | 4625 | struct net_device *dev; |
5d261913 VF |
4626 | |
4627 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 4628 | bool master; |
5d261913 | 4629 | |
5d261913 VF |
4630 | /* counter for the number of times this device was added to us */ |
4631 | u16 ref_nr; | |
4632 | ||
402dae96 VF |
4633 | /* private field for the users */ |
4634 | void *private; | |
4635 | ||
9ff162a8 JP |
4636 | struct list_head list; |
4637 | struct rcu_head rcu; | |
9ff162a8 JP |
4638 | }; |
4639 | ||
5d261913 VF |
4640 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev, |
4641 | struct net_device *adj_dev, | |
2f268f12 | 4642 | struct list_head *adj_list) |
9ff162a8 | 4643 | { |
5d261913 | 4644 | struct netdev_adjacent *adj; |
5d261913 | 4645 | |
2f268f12 | 4646 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
4647 | if (adj->dev == adj_dev) |
4648 | return adj; | |
9ff162a8 JP |
4649 | } |
4650 | return NULL; | |
4651 | } | |
4652 | ||
4653 | /** | |
4654 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
4655 | * @dev: device | |
4656 | * @upper_dev: upper device to check | |
4657 | * | |
4658 | * Find out if a device is linked to specified upper device and return true | |
4659 | * in case it is. Note that this checks only immediate upper device, | |
4660 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
4661 | */ | |
4662 | bool netdev_has_upper_dev(struct net_device *dev, | |
4663 | struct net_device *upper_dev) | |
4664 | { | |
4665 | ASSERT_RTNL(); | |
4666 | ||
2f268f12 | 4667 | return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper); |
9ff162a8 JP |
4668 | } |
4669 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
4670 | ||
4671 | /** | |
4672 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
4673 | * @dev: device | |
4674 | * | |
4675 | * Find out if a device is linked to an upper device and return true in case | |
4676 | * it is. The caller must hold the RTNL lock. | |
4677 | */ | |
1d143d9f | 4678 | static bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
4679 | { |
4680 | ASSERT_RTNL(); | |
4681 | ||
2f268f12 | 4682 | return !list_empty(&dev->all_adj_list.upper); |
9ff162a8 | 4683 | } |
9ff162a8 JP |
4684 | |
4685 | /** | |
4686 | * netdev_master_upper_dev_get - Get master upper device | |
4687 | * @dev: device | |
4688 | * | |
4689 | * Find a master upper device and return pointer to it or NULL in case | |
4690 | * it's not there. The caller must hold the RTNL lock. | |
4691 | */ | |
4692 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
4693 | { | |
aa9d8560 | 4694 | struct netdev_adjacent *upper; |
9ff162a8 JP |
4695 | |
4696 | ASSERT_RTNL(); | |
4697 | ||
2f268f12 | 4698 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
4699 | return NULL; |
4700 | ||
2f268f12 | 4701 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 4702 | struct netdev_adjacent, list); |
9ff162a8 JP |
4703 | if (likely(upper->master)) |
4704 | return upper->dev; | |
4705 | return NULL; | |
4706 | } | |
4707 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
4708 | ||
b6ccba4c VF |
4709 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
4710 | { | |
4711 | struct netdev_adjacent *adj; | |
4712 | ||
4713 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
4714 | ||
4715 | return adj->private; | |
4716 | } | |
4717 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
4718 | ||
44a40855 VY |
4719 | /** |
4720 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
4721 | * @dev: device | |
4722 | * @iter: list_head ** of the current position | |
4723 | * | |
4724 | * Gets the next device from the dev's upper list, starting from iter | |
4725 | * position. The caller must hold RCU read lock. | |
4726 | */ | |
4727 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
4728 | struct list_head **iter) | |
4729 | { | |
4730 | struct netdev_adjacent *upper; | |
4731 | ||
4732 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
4733 | ||
4734 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4735 | ||
4736 | if (&upper->list == &dev->adj_list.upper) | |
4737 | return NULL; | |
4738 | ||
4739 | *iter = &upper->list; | |
4740 | ||
4741 | return upper->dev; | |
4742 | } | |
4743 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
4744 | ||
31088a11 VF |
4745 | /** |
4746 | * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list | |
48311f46 VF |
4747 | * @dev: device |
4748 | * @iter: list_head ** of the current position | |
4749 | * | |
4750 | * Gets the next device from the dev's upper list, starting from iter | |
4751 | * position. The caller must hold RCU read lock. | |
4752 | */ | |
2f268f12 VF |
4753 | struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, |
4754 | struct list_head **iter) | |
48311f46 VF |
4755 | { |
4756 | struct netdev_adjacent *upper; | |
4757 | ||
85328240 | 4758 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
48311f46 VF |
4759 | |
4760 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4761 | ||
2f268f12 | 4762 | if (&upper->list == &dev->all_adj_list.upper) |
48311f46 VF |
4763 | return NULL; |
4764 | ||
4765 | *iter = &upper->list; | |
4766 | ||
4767 | return upper->dev; | |
4768 | } | |
2f268f12 | 4769 | EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu); |
48311f46 | 4770 | |
31088a11 VF |
4771 | /** |
4772 | * netdev_lower_get_next_private - Get the next ->private from the | |
4773 | * lower neighbour list | |
4774 | * @dev: device | |
4775 | * @iter: list_head ** of the current position | |
4776 | * | |
4777 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4778 | * list, starting from iter position. The caller must hold either hold the | |
4779 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
4780 | * list will remain unchainged. | |
4781 | */ | |
4782 | void *netdev_lower_get_next_private(struct net_device *dev, | |
4783 | struct list_head **iter) | |
4784 | { | |
4785 | struct netdev_adjacent *lower; | |
4786 | ||
4787 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
4788 | ||
4789 | if (&lower->list == &dev->adj_list.lower) | |
4790 | return NULL; | |
4791 | ||
6859e7df | 4792 | *iter = lower->list.next; |
31088a11 VF |
4793 | |
4794 | return lower->private; | |
4795 | } | |
4796 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
4797 | ||
4798 | /** | |
4799 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
4800 | * lower neighbour list, RCU | |
4801 | * variant | |
4802 | * @dev: device | |
4803 | * @iter: list_head ** of the current position | |
4804 | * | |
4805 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4806 | * list, starting from iter position. The caller must hold RCU read lock. | |
4807 | */ | |
4808 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
4809 | struct list_head **iter) | |
4810 | { | |
4811 | struct netdev_adjacent *lower; | |
4812 | ||
4813 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
4814 | ||
4815 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4816 | ||
4817 | if (&lower->list == &dev->adj_list.lower) | |
4818 | return NULL; | |
4819 | ||
6859e7df | 4820 | *iter = &lower->list; |
31088a11 VF |
4821 | |
4822 | return lower->private; | |
4823 | } | |
4824 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
4825 | ||
4085ebe8 VY |
4826 | /** |
4827 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
4828 | * list | |
4829 | * @dev: device | |
4830 | * @iter: list_head ** of the current position | |
4831 | * | |
4832 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
4833 | * list, starting from iter position. The caller must hold RTNL lock or | |
4834 | * its own locking that guarantees that the neighbour lower | |
4835 | * list will remain unchainged. | |
4836 | */ | |
4837 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
4838 | { | |
4839 | struct netdev_adjacent *lower; | |
4840 | ||
4841 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); | |
4842 | ||
4843 | if (&lower->list == &dev->adj_list.lower) | |
4844 | return NULL; | |
4845 | ||
4846 | *iter = &lower->list; | |
4847 | ||
4848 | return lower->dev; | |
4849 | } | |
4850 | EXPORT_SYMBOL(netdev_lower_get_next); | |
4851 | ||
e001bfad | 4852 | /** |
4853 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
4854 | * lower neighbour list, RCU | |
4855 | * variant | |
4856 | * @dev: device | |
4857 | * | |
4858 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
4859 | * list. The caller must hold RCU read lock. | |
4860 | */ | |
4861 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
4862 | { | |
4863 | struct netdev_adjacent *lower; | |
4864 | ||
4865 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
4866 | struct netdev_adjacent, list); | |
4867 | if (lower) | |
4868 | return lower->private; | |
4869 | return NULL; | |
4870 | } | |
4871 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
4872 | ||
9ff162a8 JP |
4873 | /** |
4874 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
4875 | * @dev: device | |
4876 | * | |
4877 | * Find a master upper device and return pointer to it or NULL in case | |
4878 | * it's not there. The caller must hold the RCU read lock. | |
4879 | */ | |
4880 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
4881 | { | |
aa9d8560 | 4882 | struct netdev_adjacent *upper; |
9ff162a8 | 4883 | |
2f268f12 | 4884 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 4885 | struct netdev_adjacent, list); |
9ff162a8 JP |
4886 | if (upper && likely(upper->master)) |
4887 | return upper->dev; | |
4888 | return NULL; | |
4889 | } | |
4890 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
4891 | ||
0a59f3a9 | 4892 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
4893 | struct net_device *adj_dev, |
4894 | struct list_head *dev_list) | |
4895 | { | |
4896 | char linkname[IFNAMSIZ+7]; | |
4897 | sprintf(linkname, dev_list == &dev->adj_list.upper ? | |
4898 | "upper_%s" : "lower_%s", adj_dev->name); | |
4899 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
4900 | linkname); | |
4901 | } | |
0a59f3a9 | 4902 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
4903 | char *name, |
4904 | struct list_head *dev_list) | |
4905 | { | |
4906 | char linkname[IFNAMSIZ+7]; | |
4907 | sprintf(linkname, dev_list == &dev->adj_list.upper ? | |
4908 | "upper_%s" : "lower_%s", name); | |
4909 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
4910 | } | |
4911 | ||
7ce64c79 AF |
4912 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
4913 | struct net_device *adj_dev, | |
4914 | struct list_head *dev_list) | |
4915 | { | |
4916 | return (dev_list == &dev->adj_list.upper || | |
4917 | dev_list == &dev->adj_list.lower) && | |
4918 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
4919 | } | |
3ee32707 | 4920 | |
5d261913 VF |
4921 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
4922 | struct net_device *adj_dev, | |
7863c054 | 4923 | struct list_head *dev_list, |
402dae96 | 4924 | void *private, bool master) |
5d261913 VF |
4925 | { |
4926 | struct netdev_adjacent *adj; | |
842d67a7 | 4927 | int ret; |
5d261913 | 4928 | |
7863c054 | 4929 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 VF |
4930 | |
4931 | if (adj) { | |
5d261913 VF |
4932 | adj->ref_nr++; |
4933 | return 0; | |
4934 | } | |
4935 | ||
4936 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
4937 | if (!adj) | |
4938 | return -ENOMEM; | |
4939 | ||
4940 | adj->dev = adj_dev; | |
4941 | adj->master = master; | |
5d261913 | 4942 | adj->ref_nr = 1; |
402dae96 | 4943 | adj->private = private; |
5d261913 | 4944 | dev_hold(adj_dev); |
2f268f12 VF |
4945 | |
4946 | pr_debug("dev_hold for %s, because of link added from %s to %s\n", | |
4947 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 | 4948 | |
7ce64c79 | 4949 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 4950 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
4951 | if (ret) |
4952 | goto free_adj; | |
4953 | } | |
4954 | ||
7863c054 | 4955 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
4956 | if (master) { |
4957 | ret = sysfs_create_link(&(dev->dev.kobj), | |
4958 | &(adj_dev->dev.kobj), "master"); | |
4959 | if (ret) | |
5831d66e | 4960 | goto remove_symlinks; |
842d67a7 | 4961 | |
7863c054 | 4962 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 4963 | } else { |
7863c054 | 4964 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 4965 | } |
5d261913 VF |
4966 | |
4967 | return 0; | |
842d67a7 | 4968 | |
5831d66e | 4969 | remove_symlinks: |
7ce64c79 | 4970 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 4971 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 VF |
4972 | free_adj: |
4973 | kfree(adj); | |
974daef7 | 4974 | dev_put(adj_dev); |
842d67a7 VF |
4975 | |
4976 | return ret; | |
5d261913 VF |
4977 | } |
4978 | ||
1d143d9f | 4979 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
4980 | struct net_device *adj_dev, | |
4981 | struct list_head *dev_list) | |
5d261913 VF |
4982 | { |
4983 | struct netdev_adjacent *adj; | |
4984 | ||
7863c054 | 4985 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 | 4986 | |
2f268f12 VF |
4987 | if (!adj) { |
4988 | pr_err("tried to remove device %s from %s\n", | |
4989 | dev->name, adj_dev->name); | |
5d261913 | 4990 | BUG(); |
2f268f12 | 4991 | } |
5d261913 VF |
4992 | |
4993 | if (adj->ref_nr > 1) { | |
2f268f12 VF |
4994 | pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name, |
4995 | adj->ref_nr-1); | |
5d261913 VF |
4996 | adj->ref_nr--; |
4997 | return; | |
4998 | } | |
4999 | ||
842d67a7 VF |
5000 | if (adj->master) |
5001 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
5002 | ||
7ce64c79 | 5003 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 5004 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 5005 | |
5d261913 | 5006 | list_del_rcu(&adj->list); |
2f268f12 VF |
5007 | pr_debug("dev_put for %s, because link removed from %s to %s\n", |
5008 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 VF |
5009 | dev_put(adj_dev); |
5010 | kfree_rcu(adj, rcu); | |
5011 | } | |
5012 | ||
1d143d9f | 5013 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
5014 | struct net_device *upper_dev, | |
5015 | struct list_head *up_list, | |
5016 | struct list_head *down_list, | |
5017 | void *private, bool master) | |
5d261913 VF |
5018 | { |
5019 | int ret; | |
5020 | ||
402dae96 VF |
5021 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private, |
5022 | master); | |
5d261913 VF |
5023 | if (ret) |
5024 | return ret; | |
5025 | ||
402dae96 VF |
5026 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private, |
5027 | false); | |
5d261913 | 5028 | if (ret) { |
2f268f12 | 5029 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
5d261913 VF |
5030 | return ret; |
5031 | } | |
5032 | ||
5033 | return 0; | |
5034 | } | |
5035 | ||
1d143d9f | 5036 | static int __netdev_adjacent_dev_link(struct net_device *dev, |
5037 | struct net_device *upper_dev) | |
5d261913 | 5038 | { |
2f268f12 VF |
5039 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
5040 | &dev->all_adj_list.upper, | |
5041 | &upper_dev->all_adj_list.lower, | |
402dae96 | 5042 | NULL, false); |
5d261913 VF |
5043 | } |
5044 | ||
1d143d9f | 5045 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
5046 | struct net_device *upper_dev, | |
5047 | struct list_head *up_list, | |
5048 | struct list_head *down_list) | |
5d261913 | 5049 | { |
2f268f12 VF |
5050 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
5051 | __netdev_adjacent_dev_remove(upper_dev, dev, down_list); | |
5d261913 VF |
5052 | } |
5053 | ||
1d143d9f | 5054 | static void __netdev_adjacent_dev_unlink(struct net_device *dev, |
5055 | struct net_device *upper_dev) | |
5d261913 | 5056 | { |
2f268f12 VF |
5057 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, |
5058 | &dev->all_adj_list.upper, | |
5059 | &upper_dev->all_adj_list.lower); | |
5060 | } | |
5061 | ||
1d143d9f | 5062 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
5063 | struct net_device *upper_dev, | |
5064 | void *private, bool master) | |
2f268f12 VF |
5065 | { |
5066 | int ret = __netdev_adjacent_dev_link(dev, upper_dev); | |
5067 | ||
5068 | if (ret) | |
5069 | return ret; | |
5070 | ||
5071 | ret = __netdev_adjacent_dev_link_lists(dev, upper_dev, | |
5072 | &dev->adj_list.upper, | |
5073 | &upper_dev->adj_list.lower, | |
402dae96 | 5074 | private, master); |
2f268f12 VF |
5075 | if (ret) { |
5076 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
5077 | return ret; | |
5078 | } | |
5079 | ||
5080 | return 0; | |
5d261913 VF |
5081 | } |
5082 | ||
1d143d9f | 5083 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
5084 | struct net_device *upper_dev) | |
2f268f12 VF |
5085 | { |
5086 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
5087 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, | |
5088 | &dev->adj_list.upper, | |
5089 | &upper_dev->adj_list.lower); | |
5090 | } | |
5d261913 | 5091 | |
9ff162a8 | 5092 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 VF |
5093 | struct net_device *upper_dev, bool master, |
5094 | void *private) | |
9ff162a8 | 5095 | { |
5d261913 VF |
5096 | struct netdev_adjacent *i, *j, *to_i, *to_j; |
5097 | int ret = 0; | |
9ff162a8 JP |
5098 | |
5099 | ASSERT_RTNL(); | |
5100 | ||
5101 | if (dev == upper_dev) | |
5102 | return -EBUSY; | |
5103 | ||
5104 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
2f268f12 | 5105 | if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper)) |
9ff162a8 JP |
5106 | return -EBUSY; |
5107 | ||
2f268f12 | 5108 | if (__netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper)) |
9ff162a8 JP |
5109 | return -EEXIST; |
5110 | ||
5111 | if (master && netdev_master_upper_dev_get(dev)) | |
5112 | return -EBUSY; | |
5113 | ||
402dae96 VF |
5114 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private, |
5115 | master); | |
5d261913 VF |
5116 | if (ret) |
5117 | return ret; | |
9ff162a8 | 5118 | |
5d261913 | 5119 | /* Now that we linked these devs, make all the upper_dev's |
2f268f12 | 5120 | * all_adj_list.upper visible to every dev's all_adj_list.lower an |
5d261913 VF |
5121 | * versa, and don't forget the devices itself. All of these |
5122 | * links are non-neighbours. | |
5123 | */ | |
2f268f12 VF |
5124 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5125 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
5126 | pr_debug("Interlinking %s with %s, non-neighbour\n", | |
5127 | i->dev->name, j->dev->name); | |
5d261913 VF |
5128 | ret = __netdev_adjacent_dev_link(i->dev, j->dev); |
5129 | if (ret) | |
5130 | goto rollback_mesh; | |
5131 | } | |
5132 | } | |
5133 | ||
5134 | /* add dev to every upper_dev's upper device */ | |
2f268f12 VF |
5135 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
5136 | pr_debug("linking %s's upper device %s with %s\n", | |
5137 | upper_dev->name, i->dev->name, dev->name); | |
5d261913 VF |
5138 | ret = __netdev_adjacent_dev_link(dev, i->dev); |
5139 | if (ret) | |
5140 | goto rollback_upper_mesh; | |
5141 | } | |
5142 | ||
5143 | /* add upper_dev to every dev's lower device */ | |
2f268f12 VF |
5144 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5145 | pr_debug("linking %s's lower device %s with %s\n", dev->name, | |
5146 | i->dev->name, upper_dev->name); | |
5d261913 VF |
5147 | ret = __netdev_adjacent_dev_link(i->dev, upper_dev); |
5148 | if (ret) | |
5149 | goto rollback_lower_mesh; | |
5150 | } | |
9ff162a8 | 5151 | |
42e52bf9 | 5152 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 | 5153 | return 0; |
5d261913 VF |
5154 | |
5155 | rollback_lower_mesh: | |
5156 | to_i = i; | |
2f268f12 | 5157 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5d261913 VF |
5158 | if (i == to_i) |
5159 | break; | |
5160 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); | |
5161 | } | |
5162 | ||
5163 | i = NULL; | |
5164 | ||
5165 | rollback_upper_mesh: | |
5166 | to_i = i; | |
2f268f12 | 5167 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
5d261913 VF |
5168 | if (i == to_i) |
5169 | break; | |
5170 | __netdev_adjacent_dev_unlink(dev, i->dev); | |
5171 | } | |
5172 | ||
5173 | i = j = NULL; | |
5174 | ||
5175 | rollback_mesh: | |
5176 | to_i = i; | |
5177 | to_j = j; | |
2f268f12 VF |
5178 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5179 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
5d261913 VF |
5180 | if (i == to_i && j == to_j) |
5181 | break; | |
5182 | __netdev_adjacent_dev_unlink(i->dev, j->dev); | |
5183 | } | |
5184 | if (i == to_i) | |
5185 | break; | |
5186 | } | |
5187 | ||
2f268f12 | 5188 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
5189 | |
5190 | return ret; | |
9ff162a8 JP |
5191 | } |
5192 | ||
5193 | /** | |
5194 | * netdev_upper_dev_link - Add a link to the upper device | |
5195 | * @dev: device | |
5196 | * @upper_dev: new upper device | |
5197 | * | |
5198 | * Adds a link to device which is upper to this one. The caller must hold | |
5199 | * the RTNL lock. On a failure a negative errno code is returned. | |
5200 | * On success the reference counts are adjusted and the function | |
5201 | * returns zero. | |
5202 | */ | |
5203 | int netdev_upper_dev_link(struct net_device *dev, | |
5204 | struct net_device *upper_dev) | |
5205 | { | |
402dae96 | 5206 | return __netdev_upper_dev_link(dev, upper_dev, false, NULL); |
9ff162a8 JP |
5207 | } |
5208 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
5209 | ||
5210 | /** | |
5211 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
5212 | * @dev: device | |
5213 | * @upper_dev: new upper device | |
5214 | * | |
5215 | * Adds a link to device which is upper to this one. In this case, only | |
5216 | * one master upper device can be linked, although other non-master devices | |
5217 | * might be linked as well. The caller must hold the RTNL lock. | |
5218 | * On a failure a negative errno code is returned. On success the reference | |
5219 | * counts are adjusted and the function returns zero. | |
5220 | */ | |
5221 | int netdev_master_upper_dev_link(struct net_device *dev, | |
5222 | struct net_device *upper_dev) | |
5223 | { | |
402dae96 | 5224 | return __netdev_upper_dev_link(dev, upper_dev, true, NULL); |
9ff162a8 JP |
5225 | } |
5226 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
5227 | ||
402dae96 VF |
5228 | int netdev_master_upper_dev_link_private(struct net_device *dev, |
5229 | struct net_device *upper_dev, | |
5230 | void *private) | |
5231 | { | |
5232 | return __netdev_upper_dev_link(dev, upper_dev, true, private); | |
5233 | } | |
5234 | EXPORT_SYMBOL(netdev_master_upper_dev_link_private); | |
5235 | ||
9ff162a8 JP |
5236 | /** |
5237 | * netdev_upper_dev_unlink - Removes a link to upper device | |
5238 | * @dev: device | |
5239 | * @upper_dev: new upper device | |
5240 | * | |
5241 | * Removes a link to device which is upper to this one. The caller must hold | |
5242 | * the RTNL lock. | |
5243 | */ | |
5244 | void netdev_upper_dev_unlink(struct net_device *dev, | |
5245 | struct net_device *upper_dev) | |
5246 | { | |
5d261913 | 5247 | struct netdev_adjacent *i, *j; |
9ff162a8 JP |
5248 | ASSERT_RTNL(); |
5249 | ||
2f268f12 | 5250 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
5251 | |
5252 | /* Here is the tricky part. We must remove all dev's lower | |
5253 | * devices from all upper_dev's upper devices and vice | |
5254 | * versa, to maintain the graph relationship. | |
5255 | */ | |
2f268f12 VF |
5256 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
5257 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) | |
5d261913 VF |
5258 | __netdev_adjacent_dev_unlink(i->dev, j->dev); |
5259 | ||
5260 | /* remove also the devices itself from lower/upper device | |
5261 | * list | |
5262 | */ | |
2f268f12 | 5263 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
5d261913 VF |
5264 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); |
5265 | ||
2f268f12 | 5266 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) |
5d261913 VF |
5267 | __netdev_adjacent_dev_unlink(dev, i->dev); |
5268 | ||
42e52bf9 | 5269 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 JP |
5270 | } |
5271 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
5272 | ||
4c75431a AF |
5273 | void netdev_adjacent_add_links(struct net_device *dev) |
5274 | { | |
5275 | struct netdev_adjacent *iter; | |
5276 | ||
5277 | struct net *net = dev_net(dev); | |
5278 | ||
5279 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
5280 | if (!net_eq(net,dev_net(iter->dev))) | |
5281 | continue; | |
5282 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5283 | &iter->dev->adj_list.lower); | |
5284 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
5285 | &dev->adj_list.upper); | |
5286 | } | |
5287 | ||
5288 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
5289 | if (!net_eq(net,dev_net(iter->dev))) | |
5290 | continue; | |
5291 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5292 | &iter->dev->adj_list.upper); | |
5293 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
5294 | &dev->adj_list.lower); | |
5295 | } | |
5296 | } | |
5297 | ||
5298 | void netdev_adjacent_del_links(struct net_device *dev) | |
5299 | { | |
5300 | struct netdev_adjacent *iter; | |
5301 | ||
5302 | struct net *net = dev_net(dev); | |
5303 | ||
5304 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
5305 | if (!net_eq(net,dev_net(iter->dev))) | |
5306 | continue; | |
5307 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
5308 | &iter->dev->adj_list.lower); | |
5309 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
5310 | &dev->adj_list.upper); | |
5311 | } | |
5312 | ||
5313 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
5314 | if (!net_eq(net,dev_net(iter->dev))) | |
5315 | continue; | |
5316 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
5317 | &iter->dev->adj_list.upper); | |
5318 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
5319 | &dev->adj_list.lower); | |
5320 | } | |
5321 | } | |
5322 | ||
5bb025fa | 5323 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 5324 | { |
5bb025fa | 5325 | struct netdev_adjacent *iter; |
402dae96 | 5326 | |
4c75431a AF |
5327 | struct net *net = dev_net(dev); |
5328 | ||
5bb025fa | 5329 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
4c75431a AF |
5330 | if (!net_eq(net,dev_net(iter->dev))) |
5331 | continue; | |
5bb025fa VF |
5332 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
5333 | &iter->dev->adj_list.lower); | |
5334 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5335 | &iter->dev->adj_list.lower); | |
5336 | } | |
402dae96 | 5337 | |
5bb025fa | 5338 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
4c75431a AF |
5339 | if (!net_eq(net,dev_net(iter->dev))) |
5340 | continue; | |
5bb025fa VF |
5341 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
5342 | &iter->dev->adj_list.upper); | |
5343 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
5344 | &iter->dev->adj_list.upper); | |
5345 | } | |
402dae96 | 5346 | } |
402dae96 VF |
5347 | |
5348 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
5349 | struct net_device *lower_dev) | |
5350 | { | |
5351 | struct netdev_adjacent *lower; | |
5352 | ||
5353 | if (!lower_dev) | |
5354 | return NULL; | |
5355 | lower = __netdev_find_adj(dev, lower_dev, &dev->adj_list.lower); | |
5356 | if (!lower) | |
5357 | return NULL; | |
5358 | ||
5359 | return lower->private; | |
5360 | } | |
5361 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
5362 | ||
4085ebe8 VY |
5363 | |
5364 | int dev_get_nest_level(struct net_device *dev, | |
5365 | bool (*type_check)(struct net_device *dev)) | |
5366 | { | |
5367 | struct net_device *lower = NULL; | |
5368 | struct list_head *iter; | |
5369 | int max_nest = -1; | |
5370 | int nest; | |
5371 | ||
5372 | ASSERT_RTNL(); | |
5373 | ||
5374 | netdev_for_each_lower_dev(dev, lower, iter) { | |
5375 | nest = dev_get_nest_level(lower, type_check); | |
5376 | if (max_nest < nest) | |
5377 | max_nest = nest; | |
5378 | } | |
5379 | ||
5380 | if (type_check(dev)) | |
5381 | max_nest++; | |
5382 | ||
5383 | return max_nest; | |
5384 | } | |
5385 | EXPORT_SYMBOL(dev_get_nest_level); | |
5386 | ||
b6c40d68 PM |
5387 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
5388 | { | |
d314774c SH |
5389 | const struct net_device_ops *ops = dev->netdev_ops; |
5390 | ||
d2615bf4 | 5391 | if (ops->ndo_change_rx_flags) |
d314774c | 5392 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
5393 | } |
5394 | ||
991fb3f7 | 5395 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 5396 | { |
b536db93 | 5397 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
5398 | kuid_t uid; |
5399 | kgid_t gid; | |
1da177e4 | 5400 | |
24023451 PM |
5401 | ASSERT_RTNL(); |
5402 | ||
dad9b335 WC |
5403 | dev->flags |= IFF_PROMISC; |
5404 | dev->promiscuity += inc; | |
5405 | if (dev->promiscuity == 0) { | |
5406 | /* | |
5407 | * Avoid overflow. | |
5408 | * If inc causes overflow, untouch promisc and return error. | |
5409 | */ | |
5410 | if (inc < 0) | |
5411 | dev->flags &= ~IFF_PROMISC; | |
5412 | else { | |
5413 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
5414 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
5415 | dev->name); | |
dad9b335 WC |
5416 | return -EOVERFLOW; |
5417 | } | |
5418 | } | |
52609c0b | 5419 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
5420 | pr_info("device %s %s promiscuous mode\n", |
5421 | dev->name, | |
5422 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
5423 | if (audit_enabled) { |
5424 | current_uid_gid(&uid, &gid); | |
7759db82 KHK |
5425 | audit_log(current->audit_context, GFP_ATOMIC, |
5426 | AUDIT_ANOM_PROMISCUOUS, | |
5427 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
5428 | dev->name, (dev->flags & IFF_PROMISC), | |
5429 | (old_flags & IFF_PROMISC), | |
e1760bd5 | 5430 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
d04a48b0 EB |
5431 | from_kuid(&init_user_ns, uid), |
5432 | from_kgid(&init_user_ns, gid), | |
7759db82 | 5433 | audit_get_sessionid(current)); |
8192b0c4 | 5434 | } |
24023451 | 5435 | |
b6c40d68 | 5436 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 5437 | } |
991fb3f7 ND |
5438 | if (notify) |
5439 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 5440 | return 0; |
1da177e4 LT |
5441 | } |
5442 | ||
4417da66 PM |
5443 | /** |
5444 | * dev_set_promiscuity - update promiscuity count on a device | |
5445 | * @dev: device | |
5446 | * @inc: modifier | |
5447 | * | |
5448 | * Add or remove promiscuity from a device. While the count in the device | |
5449 | * remains above zero the interface remains promiscuous. Once it hits zero | |
5450 | * the device reverts back to normal filtering operation. A negative inc | |
5451 | * value is used to drop promiscuity on the device. | |
dad9b335 | 5452 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 5453 | */ |
dad9b335 | 5454 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 5455 | { |
b536db93 | 5456 | unsigned int old_flags = dev->flags; |
dad9b335 | 5457 | int err; |
4417da66 | 5458 | |
991fb3f7 | 5459 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 5460 | if (err < 0) |
dad9b335 | 5461 | return err; |
4417da66 PM |
5462 | if (dev->flags != old_flags) |
5463 | dev_set_rx_mode(dev); | |
dad9b335 | 5464 | return err; |
4417da66 | 5465 | } |
d1b19dff | 5466 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 5467 | |
991fb3f7 | 5468 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 5469 | { |
991fb3f7 | 5470 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 5471 | |
24023451 PM |
5472 | ASSERT_RTNL(); |
5473 | ||
1da177e4 | 5474 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
5475 | dev->allmulti += inc; |
5476 | if (dev->allmulti == 0) { | |
5477 | /* | |
5478 | * Avoid overflow. | |
5479 | * If inc causes overflow, untouch allmulti and return error. | |
5480 | */ | |
5481 | if (inc < 0) | |
5482 | dev->flags &= ~IFF_ALLMULTI; | |
5483 | else { | |
5484 | dev->allmulti -= inc; | |
7b6cd1ce JP |
5485 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
5486 | dev->name); | |
dad9b335 WC |
5487 | return -EOVERFLOW; |
5488 | } | |
5489 | } | |
24023451 | 5490 | if (dev->flags ^ old_flags) { |
b6c40d68 | 5491 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 5492 | dev_set_rx_mode(dev); |
991fb3f7 ND |
5493 | if (notify) |
5494 | __dev_notify_flags(dev, old_flags, | |
5495 | dev->gflags ^ old_gflags); | |
24023451 | 5496 | } |
dad9b335 | 5497 | return 0; |
4417da66 | 5498 | } |
991fb3f7 ND |
5499 | |
5500 | /** | |
5501 | * dev_set_allmulti - update allmulti count on a device | |
5502 | * @dev: device | |
5503 | * @inc: modifier | |
5504 | * | |
5505 | * Add or remove reception of all multicast frames to a device. While the | |
5506 | * count in the device remains above zero the interface remains listening | |
5507 | * to all interfaces. Once it hits zero the device reverts back to normal | |
5508 | * filtering operation. A negative @inc value is used to drop the counter | |
5509 | * when releasing a resource needing all multicasts. | |
5510 | * Return 0 if successful or a negative errno code on error. | |
5511 | */ | |
5512 | ||
5513 | int dev_set_allmulti(struct net_device *dev, int inc) | |
5514 | { | |
5515 | return __dev_set_allmulti(dev, inc, true); | |
5516 | } | |
d1b19dff | 5517 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
5518 | |
5519 | /* | |
5520 | * Upload unicast and multicast address lists to device and | |
5521 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 5522 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
5523 | * are present. |
5524 | */ | |
5525 | void __dev_set_rx_mode(struct net_device *dev) | |
5526 | { | |
d314774c SH |
5527 | const struct net_device_ops *ops = dev->netdev_ops; |
5528 | ||
4417da66 PM |
5529 | /* dev_open will call this function so the list will stay sane. */ |
5530 | if (!(dev->flags&IFF_UP)) | |
5531 | return; | |
5532 | ||
5533 | if (!netif_device_present(dev)) | |
40b77c94 | 5534 | return; |
4417da66 | 5535 | |
01789349 | 5536 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
5537 | /* Unicast addresses changes may only happen under the rtnl, |
5538 | * therefore calling __dev_set_promiscuity here is safe. | |
5539 | */ | |
32e7bfc4 | 5540 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 5541 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 5542 | dev->uc_promisc = true; |
32e7bfc4 | 5543 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 5544 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 5545 | dev->uc_promisc = false; |
4417da66 | 5546 | } |
4417da66 | 5547 | } |
01789349 JP |
5548 | |
5549 | if (ops->ndo_set_rx_mode) | |
5550 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
5551 | } |
5552 | ||
5553 | void dev_set_rx_mode(struct net_device *dev) | |
5554 | { | |
b9e40857 | 5555 | netif_addr_lock_bh(dev); |
4417da66 | 5556 | __dev_set_rx_mode(dev); |
b9e40857 | 5557 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
5558 | } |
5559 | ||
f0db275a SH |
5560 | /** |
5561 | * dev_get_flags - get flags reported to userspace | |
5562 | * @dev: device | |
5563 | * | |
5564 | * Get the combination of flag bits exported through APIs to userspace. | |
5565 | */ | |
95c96174 | 5566 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 5567 | { |
95c96174 | 5568 | unsigned int flags; |
1da177e4 LT |
5569 | |
5570 | flags = (dev->flags & ~(IFF_PROMISC | | |
5571 | IFF_ALLMULTI | | |
b00055aa SR |
5572 | IFF_RUNNING | |
5573 | IFF_LOWER_UP | | |
5574 | IFF_DORMANT)) | | |
1da177e4 LT |
5575 | (dev->gflags & (IFF_PROMISC | |
5576 | IFF_ALLMULTI)); | |
5577 | ||
b00055aa SR |
5578 | if (netif_running(dev)) { |
5579 | if (netif_oper_up(dev)) | |
5580 | flags |= IFF_RUNNING; | |
5581 | if (netif_carrier_ok(dev)) | |
5582 | flags |= IFF_LOWER_UP; | |
5583 | if (netif_dormant(dev)) | |
5584 | flags |= IFF_DORMANT; | |
5585 | } | |
1da177e4 LT |
5586 | |
5587 | return flags; | |
5588 | } | |
d1b19dff | 5589 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 5590 | |
bd380811 | 5591 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
1da177e4 | 5592 | { |
b536db93 | 5593 | unsigned int old_flags = dev->flags; |
bd380811 | 5594 | int ret; |
1da177e4 | 5595 | |
24023451 PM |
5596 | ASSERT_RTNL(); |
5597 | ||
1da177e4 LT |
5598 | /* |
5599 | * Set the flags on our device. | |
5600 | */ | |
5601 | ||
5602 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
5603 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
5604 | IFF_AUTOMEDIA)) | | |
5605 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
5606 | IFF_ALLMULTI)); | |
5607 | ||
5608 | /* | |
5609 | * Load in the correct multicast list now the flags have changed. | |
5610 | */ | |
5611 | ||
b6c40d68 PM |
5612 | if ((old_flags ^ flags) & IFF_MULTICAST) |
5613 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 5614 | |
4417da66 | 5615 | dev_set_rx_mode(dev); |
1da177e4 LT |
5616 | |
5617 | /* | |
5618 | * Have we downed the interface. We handle IFF_UP ourselves | |
5619 | * according to user attempts to set it, rather than blindly | |
5620 | * setting it. | |
5621 | */ | |
5622 | ||
5623 | ret = 0; | |
d215d10f | 5624 | if ((old_flags ^ flags) & IFF_UP) |
bd380811 | 5625 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
1da177e4 | 5626 | |
1da177e4 | 5627 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 5628 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 5629 | unsigned int old_flags = dev->flags; |
d1b19dff | 5630 | |
1da177e4 | 5631 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
5632 | |
5633 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
5634 | if (dev->flags != old_flags) | |
5635 | dev_set_rx_mode(dev); | |
1da177e4 LT |
5636 | } |
5637 | ||
5638 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
5639 | is important. Some (broken) drivers set IFF_PROMISC, when | |
5640 | IFF_ALLMULTI is requested not asking us and not reporting. | |
5641 | */ | |
5642 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
5643 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
5644 | ||
1da177e4 | 5645 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 5646 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
5647 | } |
5648 | ||
bd380811 PM |
5649 | return ret; |
5650 | } | |
5651 | ||
a528c219 ND |
5652 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
5653 | unsigned int gchanges) | |
bd380811 PM |
5654 | { |
5655 | unsigned int changes = dev->flags ^ old_flags; | |
5656 | ||
a528c219 | 5657 | if (gchanges) |
7f294054 | 5658 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 5659 | |
bd380811 PM |
5660 | if (changes & IFF_UP) { |
5661 | if (dev->flags & IFF_UP) | |
5662 | call_netdevice_notifiers(NETDEV_UP, dev); | |
5663 | else | |
5664 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
5665 | } | |
5666 | ||
5667 | if (dev->flags & IFF_UP && | |
be9efd36 JP |
5668 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
5669 | struct netdev_notifier_change_info change_info; | |
5670 | ||
5671 | change_info.flags_changed = changes; | |
5672 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
5673 | &change_info.info); | |
5674 | } | |
bd380811 PM |
5675 | } |
5676 | ||
5677 | /** | |
5678 | * dev_change_flags - change device settings | |
5679 | * @dev: device | |
5680 | * @flags: device state flags | |
5681 | * | |
5682 | * Change settings on device based state flags. The flags are | |
5683 | * in the userspace exported format. | |
5684 | */ | |
b536db93 | 5685 | int dev_change_flags(struct net_device *dev, unsigned int flags) |
bd380811 | 5686 | { |
b536db93 | 5687 | int ret; |
991fb3f7 | 5688 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 PM |
5689 | |
5690 | ret = __dev_change_flags(dev, flags); | |
5691 | if (ret < 0) | |
5692 | return ret; | |
5693 | ||
991fb3f7 | 5694 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 5695 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
5696 | return ret; |
5697 | } | |
d1b19dff | 5698 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 5699 | |
2315dc91 VF |
5700 | static int __dev_set_mtu(struct net_device *dev, int new_mtu) |
5701 | { | |
5702 | const struct net_device_ops *ops = dev->netdev_ops; | |
5703 | ||
5704 | if (ops->ndo_change_mtu) | |
5705 | return ops->ndo_change_mtu(dev, new_mtu); | |
5706 | ||
5707 | dev->mtu = new_mtu; | |
5708 | return 0; | |
5709 | } | |
5710 | ||
f0db275a SH |
5711 | /** |
5712 | * dev_set_mtu - Change maximum transfer unit | |
5713 | * @dev: device | |
5714 | * @new_mtu: new transfer unit | |
5715 | * | |
5716 | * Change the maximum transfer size of the network device. | |
5717 | */ | |
1da177e4 LT |
5718 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
5719 | { | |
2315dc91 | 5720 | int err, orig_mtu; |
1da177e4 LT |
5721 | |
5722 | if (new_mtu == dev->mtu) | |
5723 | return 0; | |
5724 | ||
5725 | /* MTU must be positive. */ | |
5726 | if (new_mtu < 0) | |
5727 | return -EINVAL; | |
5728 | ||
5729 | if (!netif_device_present(dev)) | |
5730 | return -ENODEV; | |
5731 | ||
1d486bfb VF |
5732 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
5733 | err = notifier_to_errno(err); | |
5734 | if (err) | |
5735 | return err; | |
d314774c | 5736 | |
2315dc91 VF |
5737 | orig_mtu = dev->mtu; |
5738 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 5739 | |
2315dc91 VF |
5740 | if (!err) { |
5741 | err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
5742 | err = notifier_to_errno(err); | |
5743 | if (err) { | |
5744 | /* setting mtu back and notifying everyone again, | |
5745 | * so that they have a chance to revert changes. | |
5746 | */ | |
5747 | __dev_set_mtu(dev, orig_mtu); | |
5748 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
5749 | } | |
5750 | } | |
1da177e4 LT |
5751 | return err; |
5752 | } | |
d1b19dff | 5753 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 5754 | |
cbda10fa VD |
5755 | /** |
5756 | * dev_set_group - Change group this device belongs to | |
5757 | * @dev: device | |
5758 | * @new_group: group this device should belong to | |
5759 | */ | |
5760 | void dev_set_group(struct net_device *dev, int new_group) | |
5761 | { | |
5762 | dev->group = new_group; | |
5763 | } | |
5764 | EXPORT_SYMBOL(dev_set_group); | |
5765 | ||
f0db275a SH |
5766 | /** |
5767 | * dev_set_mac_address - Change Media Access Control Address | |
5768 | * @dev: device | |
5769 | * @sa: new address | |
5770 | * | |
5771 | * Change the hardware (MAC) address of the device | |
5772 | */ | |
1da177e4 LT |
5773 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
5774 | { | |
d314774c | 5775 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
5776 | int err; |
5777 | ||
d314774c | 5778 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
5779 | return -EOPNOTSUPP; |
5780 | if (sa->sa_family != dev->type) | |
5781 | return -EINVAL; | |
5782 | if (!netif_device_present(dev)) | |
5783 | return -ENODEV; | |
d314774c | 5784 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
5785 | if (err) |
5786 | return err; | |
fbdeca2d | 5787 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 5788 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 5789 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 5790 | return 0; |
1da177e4 | 5791 | } |
d1b19dff | 5792 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 5793 | |
4bf84c35 JP |
5794 | /** |
5795 | * dev_change_carrier - Change device carrier | |
5796 | * @dev: device | |
691b3b7e | 5797 | * @new_carrier: new value |
4bf84c35 JP |
5798 | * |
5799 | * Change device carrier | |
5800 | */ | |
5801 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
5802 | { | |
5803 | const struct net_device_ops *ops = dev->netdev_ops; | |
5804 | ||
5805 | if (!ops->ndo_change_carrier) | |
5806 | return -EOPNOTSUPP; | |
5807 | if (!netif_device_present(dev)) | |
5808 | return -ENODEV; | |
5809 | return ops->ndo_change_carrier(dev, new_carrier); | |
5810 | } | |
5811 | EXPORT_SYMBOL(dev_change_carrier); | |
5812 | ||
66b52b0d JP |
5813 | /** |
5814 | * dev_get_phys_port_id - Get device physical port ID | |
5815 | * @dev: device | |
5816 | * @ppid: port ID | |
5817 | * | |
5818 | * Get device physical port ID | |
5819 | */ | |
5820 | int dev_get_phys_port_id(struct net_device *dev, | |
5821 | struct netdev_phys_port_id *ppid) | |
5822 | { | |
5823 | const struct net_device_ops *ops = dev->netdev_ops; | |
5824 | ||
5825 | if (!ops->ndo_get_phys_port_id) | |
5826 | return -EOPNOTSUPP; | |
5827 | return ops->ndo_get_phys_port_id(dev, ppid); | |
5828 | } | |
5829 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
5830 | ||
1da177e4 LT |
5831 | /** |
5832 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 5833 | * @net: the applicable net namespace |
1da177e4 LT |
5834 | * |
5835 | * Returns a suitable unique value for a new device interface | |
5836 | * number. The caller must hold the rtnl semaphore or the | |
5837 | * dev_base_lock to be sure it remains unique. | |
5838 | */ | |
881d966b | 5839 | static int dev_new_index(struct net *net) |
1da177e4 | 5840 | { |
aa79e66e | 5841 | int ifindex = net->ifindex; |
1da177e4 LT |
5842 | for (;;) { |
5843 | if (++ifindex <= 0) | |
5844 | ifindex = 1; | |
881d966b | 5845 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 5846 | return net->ifindex = ifindex; |
1da177e4 LT |
5847 | } |
5848 | } | |
5849 | ||
1da177e4 | 5850 | /* Delayed registration/unregisteration */ |
3b5b34fd | 5851 | static LIST_HEAD(net_todo_list); |
200b916f | 5852 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 5853 | |
6f05f629 | 5854 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 5855 | { |
1da177e4 | 5856 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 5857 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
5858 | } |
5859 | ||
9b5e383c | 5860 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 5861 | { |
e93737b0 | 5862 | struct net_device *dev, *tmp; |
5cde2829 | 5863 | LIST_HEAD(close_head); |
9b5e383c | 5864 | |
93ee31f1 DL |
5865 | BUG_ON(dev_boot_phase); |
5866 | ASSERT_RTNL(); | |
5867 | ||
e93737b0 | 5868 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 5869 | /* Some devices call without registering |
e93737b0 KK |
5870 | * for initialization unwind. Remove those |
5871 | * devices and proceed with the remaining. | |
9b5e383c ED |
5872 | */ |
5873 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
5874 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
5875 | dev->name, dev); | |
93ee31f1 | 5876 | |
9b5e383c | 5877 | WARN_ON(1); |
e93737b0 KK |
5878 | list_del(&dev->unreg_list); |
5879 | continue; | |
9b5e383c | 5880 | } |
449f4544 | 5881 | dev->dismantle = true; |
9b5e383c | 5882 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 5883 | } |
93ee31f1 | 5884 | |
44345724 | 5885 | /* If device is running, close it first. */ |
5cde2829 EB |
5886 | list_for_each_entry(dev, head, unreg_list) |
5887 | list_add_tail(&dev->close_list, &close_head); | |
5888 | dev_close_many(&close_head); | |
93ee31f1 | 5889 | |
44345724 | 5890 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
5891 | /* And unlink it from device chain. */ |
5892 | unlist_netdevice(dev); | |
93ee31f1 | 5893 | |
9b5e383c ED |
5894 | dev->reg_state = NETREG_UNREGISTERING; |
5895 | } | |
93ee31f1 DL |
5896 | |
5897 | synchronize_net(); | |
5898 | ||
9b5e383c ED |
5899 | list_for_each_entry(dev, head, unreg_list) { |
5900 | /* Shutdown queueing discipline. */ | |
5901 | dev_shutdown(dev); | |
93ee31f1 DL |
5902 | |
5903 | ||
9b5e383c ED |
5904 | /* Notify protocols, that we are about to destroy |
5905 | this device. They should clean all the things. | |
5906 | */ | |
5907 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
93ee31f1 | 5908 | |
9b5e383c ED |
5909 | /* |
5910 | * Flush the unicast and multicast chains | |
5911 | */ | |
a748ee24 | 5912 | dev_uc_flush(dev); |
22bedad3 | 5913 | dev_mc_flush(dev); |
93ee31f1 | 5914 | |
9b5e383c ED |
5915 | if (dev->netdev_ops->ndo_uninit) |
5916 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 5917 | |
56bfa7ee RP |
5918 | if (!dev->rtnl_link_ops || |
5919 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
5920 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); | |
5921 | ||
9ff162a8 JP |
5922 | /* Notifier chain MUST detach us all upper devices. */ |
5923 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
93ee31f1 | 5924 | |
9b5e383c ED |
5925 | /* Remove entries from kobject tree */ |
5926 | netdev_unregister_kobject(dev); | |
024e9679 AD |
5927 | #ifdef CONFIG_XPS |
5928 | /* Remove XPS queueing entries */ | |
5929 | netif_reset_xps_queues_gt(dev, 0); | |
5930 | #endif | |
9b5e383c | 5931 | } |
93ee31f1 | 5932 | |
850a545b | 5933 | synchronize_net(); |
395264d5 | 5934 | |
a5ee1551 | 5935 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
5936 | dev_put(dev); |
5937 | } | |
5938 | ||
5939 | static void rollback_registered(struct net_device *dev) | |
5940 | { | |
5941 | LIST_HEAD(single); | |
5942 | ||
5943 | list_add(&dev->unreg_list, &single); | |
5944 | rollback_registered_many(&single); | |
ceaaec98 | 5945 | list_del(&single); |
93ee31f1 DL |
5946 | } |
5947 | ||
c8f44aff MM |
5948 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
5949 | netdev_features_t features) | |
b63365a2 | 5950 | { |
57422dc5 MM |
5951 | /* Fix illegal checksum combinations */ |
5952 | if ((features & NETIF_F_HW_CSUM) && | |
5953 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 5954 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
5955 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
5956 | } | |
5957 | ||
b63365a2 | 5958 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 5959 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 5960 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 5961 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
5962 | } |
5963 | ||
ec5f0615 PS |
5964 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
5965 | !(features & NETIF_F_IP_CSUM)) { | |
5966 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
5967 | features &= ~NETIF_F_TSO; | |
5968 | features &= ~NETIF_F_TSO_ECN; | |
5969 | } | |
5970 | ||
5971 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
5972 | !(features & NETIF_F_IPV6_CSUM)) { | |
5973 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
5974 | features &= ~NETIF_F_TSO6; | |
5975 | } | |
5976 | ||
31d8b9e0 BH |
5977 | /* TSO ECN requires that TSO is present as well. */ |
5978 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
5979 | features &= ~NETIF_F_TSO_ECN; | |
5980 | ||
212b573f MM |
5981 | /* Software GSO depends on SG. */ |
5982 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 5983 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
5984 | features &= ~NETIF_F_GSO; |
5985 | } | |
5986 | ||
acd1130e | 5987 | /* UFO needs SG and checksumming */ |
b63365a2 | 5988 | if (features & NETIF_F_UFO) { |
79032644 MM |
5989 | /* maybe split UFO into V4 and V6? */ |
5990 | if (!((features & NETIF_F_GEN_CSUM) || | |
5991 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) | |
5992 | == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 5993 | netdev_dbg(dev, |
acd1130e | 5994 | "Dropping NETIF_F_UFO since no checksum offload features.\n"); |
b63365a2 HX |
5995 | features &= ~NETIF_F_UFO; |
5996 | } | |
5997 | ||
5998 | if (!(features & NETIF_F_SG)) { | |
6f404e44 | 5999 | netdev_dbg(dev, |
acd1130e | 6000 | "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n"); |
b63365a2 HX |
6001 | features &= ~NETIF_F_UFO; |
6002 | } | |
6003 | } | |
6004 | ||
d0290214 JP |
6005 | #ifdef CONFIG_NET_RX_BUSY_POLL |
6006 | if (dev->netdev_ops->ndo_busy_poll) | |
6007 | features |= NETIF_F_BUSY_POLL; | |
6008 | else | |
6009 | #endif | |
6010 | features &= ~NETIF_F_BUSY_POLL; | |
6011 | ||
b63365a2 HX |
6012 | return features; |
6013 | } | |
b63365a2 | 6014 | |
6cb6a27c | 6015 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 6016 | { |
c8f44aff | 6017 | netdev_features_t features; |
5455c699 MM |
6018 | int err = 0; |
6019 | ||
87267485 MM |
6020 | ASSERT_RTNL(); |
6021 | ||
5455c699 MM |
6022 | features = netdev_get_wanted_features(dev); |
6023 | ||
6024 | if (dev->netdev_ops->ndo_fix_features) | |
6025 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
6026 | ||
6027 | /* driver might be less strict about feature dependencies */ | |
6028 | features = netdev_fix_features(dev, features); | |
6029 | ||
6030 | if (dev->features == features) | |
6cb6a27c | 6031 | return 0; |
5455c699 | 6032 | |
c8f44aff MM |
6033 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
6034 | &dev->features, &features); | |
5455c699 MM |
6035 | |
6036 | if (dev->netdev_ops->ndo_set_features) | |
6037 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
6038 | ||
6cb6a27c | 6039 | if (unlikely(err < 0)) { |
5455c699 | 6040 | netdev_err(dev, |
c8f44aff MM |
6041 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
6042 | err, &features, &dev->features); | |
6cb6a27c MM |
6043 | return -1; |
6044 | } | |
6045 | ||
6046 | if (!err) | |
6047 | dev->features = features; | |
6048 | ||
6049 | return 1; | |
6050 | } | |
6051 | ||
afe12cc8 MM |
6052 | /** |
6053 | * netdev_update_features - recalculate device features | |
6054 | * @dev: the device to check | |
6055 | * | |
6056 | * Recalculate dev->features set and send notifications if it | |
6057 | * has changed. Should be called after driver or hardware dependent | |
6058 | * conditions might have changed that influence the features. | |
6059 | */ | |
6cb6a27c MM |
6060 | void netdev_update_features(struct net_device *dev) |
6061 | { | |
6062 | if (__netdev_update_features(dev)) | |
6063 | netdev_features_change(dev); | |
5455c699 MM |
6064 | } |
6065 | EXPORT_SYMBOL(netdev_update_features); | |
6066 | ||
afe12cc8 MM |
6067 | /** |
6068 | * netdev_change_features - recalculate device features | |
6069 | * @dev: the device to check | |
6070 | * | |
6071 | * Recalculate dev->features set and send notifications even | |
6072 | * if they have not changed. Should be called instead of | |
6073 | * netdev_update_features() if also dev->vlan_features might | |
6074 | * have changed to allow the changes to be propagated to stacked | |
6075 | * VLAN devices. | |
6076 | */ | |
6077 | void netdev_change_features(struct net_device *dev) | |
6078 | { | |
6079 | __netdev_update_features(dev); | |
6080 | netdev_features_change(dev); | |
6081 | } | |
6082 | EXPORT_SYMBOL(netdev_change_features); | |
6083 | ||
fc4a7489 PM |
6084 | /** |
6085 | * netif_stacked_transfer_operstate - transfer operstate | |
6086 | * @rootdev: the root or lower level device to transfer state from | |
6087 | * @dev: the device to transfer operstate to | |
6088 | * | |
6089 | * Transfer operational state from root to device. This is normally | |
6090 | * called when a stacking relationship exists between the root | |
6091 | * device and the device(a leaf device). | |
6092 | */ | |
6093 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
6094 | struct net_device *dev) | |
6095 | { | |
6096 | if (rootdev->operstate == IF_OPER_DORMANT) | |
6097 | netif_dormant_on(dev); | |
6098 | else | |
6099 | netif_dormant_off(dev); | |
6100 | ||
6101 | if (netif_carrier_ok(rootdev)) { | |
6102 | if (!netif_carrier_ok(dev)) | |
6103 | netif_carrier_on(dev); | |
6104 | } else { | |
6105 | if (netif_carrier_ok(dev)) | |
6106 | netif_carrier_off(dev); | |
6107 | } | |
6108 | } | |
6109 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
6110 | ||
a953be53 | 6111 | #ifdef CONFIG_SYSFS |
1b4bf461 ED |
6112 | static int netif_alloc_rx_queues(struct net_device *dev) |
6113 | { | |
1b4bf461 | 6114 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 6115 | struct netdev_rx_queue *rx; |
1b4bf461 | 6116 | |
bd25fa7b | 6117 | BUG_ON(count < 1); |
1b4bf461 | 6118 | |
bd25fa7b | 6119 | rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
62b5942a | 6120 | if (!rx) |
bd25fa7b | 6121 | return -ENOMEM; |
62b5942a | 6122 | |
bd25fa7b TH |
6123 | dev->_rx = rx; |
6124 | ||
bd25fa7b | 6125 | for (i = 0; i < count; i++) |
fe822240 | 6126 | rx[i].dev = dev; |
1b4bf461 ED |
6127 | return 0; |
6128 | } | |
bf264145 | 6129 | #endif |
1b4bf461 | 6130 | |
aa942104 CG |
6131 | static void netdev_init_one_queue(struct net_device *dev, |
6132 | struct netdev_queue *queue, void *_unused) | |
6133 | { | |
6134 | /* Initialize queue lock */ | |
6135 | spin_lock_init(&queue->_xmit_lock); | |
6136 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); | |
6137 | queue->xmit_lock_owner = -1; | |
b236da69 | 6138 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 6139 | queue->dev = dev; |
114cf580 TH |
6140 | #ifdef CONFIG_BQL |
6141 | dql_init(&queue->dql, HZ); | |
6142 | #endif | |
aa942104 CG |
6143 | } |
6144 | ||
60877a32 ED |
6145 | static void netif_free_tx_queues(struct net_device *dev) |
6146 | { | |
4cb28970 | 6147 | kvfree(dev->_tx); |
60877a32 ED |
6148 | } |
6149 | ||
e6484930 TH |
6150 | static int netif_alloc_netdev_queues(struct net_device *dev) |
6151 | { | |
6152 | unsigned int count = dev->num_tx_queues; | |
6153 | struct netdev_queue *tx; | |
60877a32 | 6154 | size_t sz = count * sizeof(*tx); |
e6484930 | 6155 | |
60877a32 | 6156 | BUG_ON(count < 1 || count > 0xffff); |
62b5942a | 6157 | |
60877a32 ED |
6158 | tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
6159 | if (!tx) { | |
6160 | tx = vzalloc(sz); | |
6161 | if (!tx) | |
6162 | return -ENOMEM; | |
6163 | } | |
e6484930 | 6164 | dev->_tx = tx; |
1d24eb48 | 6165 | |
e6484930 TH |
6166 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
6167 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
6168 | |
6169 | return 0; | |
e6484930 TH |
6170 | } |
6171 | ||
1da177e4 LT |
6172 | /** |
6173 | * register_netdevice - register a network device | |
6174 | * @dev: device to register | |
6175 | * | |
6176 | * Take a completed network device structure and add it to the kernel | |
6177 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
6178 | * chain. 0 is returned on success. A negative errno code is returned | |
6179 | * on a failure to set up the device, or if the name is a duplicate. | |
6180 | * | |
6181 | * Callers must hold the rtnl semaphore. You may want | |
6182 | * register_netdev() instead of this. | |
6183 | * | |
6184 | * BUGS: | |
6185 | * The locking appears insufficient to guarantee two parallel registers | |
6186 | * will not get the same name. | |
6187 | */ | |
6188 | ||
6189 | int register_netdevice(struct net_device *dev) | |
6190 | { | |
1da177e4 | 6191 | int ret; |
d314774c | 6192 | struct net *net = dev_net(dev); |
1da177e4 LT |
6193 | |
6194 | BUG_ON(dev_boot_phase); | |
6195 | ASSERT_RTNL(); | |
6196 | ||
b17a7c17 SH |
6197 | might_sleep(); |
6198 | ||
1da177e4 LT |
6199 | /* When net_device's are persistent, this will be fatal. */ |
6200 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 6201 | BUG_ON(!net); |
1da177e4 | 6202 | |
f1f28aa3 | 6203 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 6204 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 6205 | |
1da177e4 LT |
6206 | dev->iflink = -1; |
6207 | ||
828de4f6 | 6208 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
6209 | if (ret < 0) |
6210 | goto out; | |
6211 | ||
1da177e4 | 6212 | /* Init, if this function is available */ |
d314774c SH |
6213 | if (dev->netdev_ops->ndo_init) { |
6214 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
6215 | if (ret) { |
6216 | if (ret > 0) | |
6217 | ret = -EIO; | |
90833aa4 | 6218 | goto out; |
1da177e4 LT |
6219 | } |
6220 | } | |
4ec93edb | 6221 | |
f646968f PM |
6222 | if (((dev->hw_features | dev->features) & |
6223 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
6224 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
6225 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
6226 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
6227 | ret = -EINVAL; | |
6228 | goto err_uninit; | |
6229 | } | |
6230 | ||
9c7dafbf PE |
6231 | ret = -EBUSY; |
6232 | if (!dev->ifindex) | |
6233 | dev->ifindex = dev_new_index(net); | |
6234 | else if (__dev_get_by_index(net, dev->ifindex)) | |
6235 | goto err_uninit; | |
6236 | ||
1da177e4 LT |
6237 | if (dev->iflink == -1) |
6238 | dev->iflink = dev->ifindex; | |
6239 | ||
5455c699 MM |
6240 | /* Transfer changeable features to wanted_features and enable |
6241 | * software offloads (GSO and GRO). | |
6242 | */ | |
6243 | dev->hw_features |= NETIF_F_SOFT_FEATURES; | |
14d1232f MM |
6244 | dev->features |= NETIF_F_SOFT_FEATURES; |
6245 | dev->wanted_features = dev->features & dev->hw_features; | |
1da177e4 | 6246 | |
34324dc2 MM |
6247 | if (!(dev->flags & IFF_LOOPBACK)) { |
6248 | dev->hw_features |= NETIF_F_NOCACHE_COPY; | |
c6e1a0d1 TH |
6249 | } |
6250 | ||
1180e7d6 | 6251 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 6252 | */ |
1180e7d6 | 6253 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 6254 | |
ee579677 PS |
6255 | /* Make NETIF_F_SG inheritable to tunnel devices. |
6256 | */ | |
6257 | dev->hw_enc_features |= NETIF_F_SG; | |
6258 | ||
0d89d203 SH |
6259 | /* Make NETIF_F_SG inheritable to MPLS. |
6260 | */ | |
6261 | dev->mpls_features |= NETIF_F_SG; | |
6262 | ||
7ffbe3fd JB |
6263 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
6264 | ret = notifier_to_errno(ret); | |
6265 | if (ret) | |
6266 | goto err_uninit; | |
6267 | ||
8b41d188 | 6268 | ret = netdev_register_kobject(dev); |
b17a7c17 | 6269 | if (ret) |
7ce1b0ed | 6270 | goto err_uninit; |
b17a7c17 SH |
6271 | dev->reg_state = NETREG_REGISTERED; |
6272 | ||
6cb6a27c | 6273 | __netdev_update_features(dev); |
8e9b59b2 | 6274 | |
1da177e4 LT |
6275 | /* |
6276 | * Default initial state at registry is that the | |
6277 | * device is present. | |
6278 | */ | |
6279 | ||
6280 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
6281 | ||
8f4cccbb BH |
6282 | linkwatch_init_dev(dev); |
6283 | ||
1da177e4 | 6284 | dev_init_scheduler(dev); |
1da177e4 | 6285 | dev_hold(dev); |
ce286d32 | 6286 | list_netdevice(dev); |
7bf23575 | 6287 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 6288 | |
948b337e JP |
6289 | /* If the device has permanent device address, driver should |
6290 | * set dev_addr and also addr_assign_type should be set to | |
6291 | * NET_ADDR_PERM (default value). | |
6292 | */ | |
6293 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
6294 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
6295 | ||
1da177e4 | 6296 | /* Notify protocols, that a new device appeared. */ |
056925ab | 6297 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 6298 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
6299 | if (ret) { |
6300 | rollback_registered(dev); | |
6301 | dev->reg_state = NETREG_UNREGISTERED; | |
6302 | } | |
d90a909e EB |
6303 | /* |
6304 | * Prevent userspace races by waiting until the network | |
6305 | * device is fully setup before sending notifications. | |
6306 | */ | |
a2835763 PM |
6307 | if (!dev->rtnl_link_ops || |
6308 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 6309 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
6310 | |
6311 | out: | |
6312 | return ret; | |
7ce1b0ed HX |
6313 | |
6314 | err_uninit: | |
d314774c SH |
6315 | if (dev->netdev_ops->ndo_uninit) |
6316 | dev->netdev_ops->ndo_uninit(dev); | |
7ce1b0ed | 6317 | goto out; |
1da177e4 | 6318 | } |
d1b19dff | 6319 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 6320 | |
937f1ba5 BH |
6321 | /** |
6322 | * init_dummy_netdev - init a dummy network device for NAPI | |
6323 | * @dev: device to init | |
6324 | * | |
6325 | * This takes a network device structure and initialize the minimum | |
6326 | * amount of fields so it can be used to schedule NAPI polls without | |
6327 | * registering a full blown interface. This is to be used by drivers | |
6328 | * that need to tie several hardware interfaces to a single NAPI | |
6329 | * poll scheduler due to HW limitations. | |
6330 | */ | |
6331 | int init_dummy_netdev(struct net_device *dev) | |
6332 | { | |
6333 | /* Clear everything. Note we don't initialize spinlocks | |
6334 | * are they aren't supposed to be taken by any of the | |
6335 | * NAPI code and this dummy netdev is supposed to be | |
6336 | * only ever used for NAPI polls | |
6337 | */ | |
6338 | memset(dev, 0, sizeof(struct net_device)); | |
6339 | ||
6340 | /* make sure we BUG if trying to hit standard | |
6341 | * register/unregister code path | |
6342 | */ | |
6343 | dev->reg_state = NETREG_DUMMY; | |
6344 | ||
937f1ba5 BH |
6345 | /* NAPI wants this */ |
6346 | INIT_LIST_HEAD(&dev->napi_list); | |
6347 | ||
6348 | /* a dummy interface is started by default */ | |
6349 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
6350 | set_bit(__LINK_STATE_START, &dev->state); | |
6351 | ||
29b4433d ED |
6352 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
6353 | * because users of this 'device' dont need to change | |
6354 | * its refcount. | |
6355 | */ | |
6356 | ||
937f1ba5 BH |
6357 | return 0; |
6358 | } | |
6359 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
6360 | ||
6361 | ||
1da177e4 LT |
6362 | /** |
6363 | * register_netdev - register a network device | |
6364 | * @dev: device to register | |
6365 | * | |
6366 | * Take a completed network device structure and add it to the kernel | |
6367 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
6368 | * chain. 0 is returned on success. A negative errno code is returned | |
6369 | * on a failure to set up the device, or if the name is a duplicate. | |
6370 | * | |
38b4da38 | 6371 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
6372 | * and expands the device name if you passed a format string to |
6373 | * alloc_netdev. | |
6374 | */ | |
6375 | int register_netdev(struct net_device *dev) | |
6376 | { | |
6377 | int err; | |
6378 | ||
6379 | rtnl_lock(); | |
1da177e4 | 6380 | err = register_netdevice(dev); |
1da177e4 LT |
6381 | rtnl_unlock(); |
6382 | return err; | |
6383 | } | |
6384 | EXPORT_SYMBOL(register_netdev); | |
6385 | ||
29b4433d ED |
6386 | int netdev_refcnt_read(const struct net_device *dev) |
6387 | { | |
6388 | int i, refcnt = 0; | |
6389 | ||
6390 | for_each_possible_cpu(i) | |
6391 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
6392 | return refcnt; | |
6393 | } | |
6394 | EXPORT_SYMBOL(netdev_refcnt_read); | |
6395 | ||
2c53040f | 6396 | /** |
1da177e4 | 6397 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 6398 | * @dev: target net_device |
1da177e4 LT |
6399 | * |
6400 | * This is called when unregistering network devices. | |
6401 | * | |
6402 | * Any protocol or device that holds a reference should register | |
6403 | * for netdevice notification, and cleanup and put back the | |
6404 | * reference if they receive an UNREGISTER event. | |
6405 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 6406 | * call dev_put. |
1da177e4 LT |
6407 | */ |
6408 | static void netdev_wait_allrefs(struct net_device *dev) | |
6409 | { | |
6410 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 6411 | int refcnt; |
1da177e4 | 6412 | |
e014debe ED |
6413 | linkwatch_forget_dev(dev); |
6414 | ||
1da177e4 | 6415 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
6416 | refcnt = netdev_refcnt_read(dev); |
6417 | ||
6418 | while (refcnt != 0) { | |
1da177e4 | 6419 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 6420 | rtnl_lock(); |
1da177e4 LT |
6421 | |
6422 | /* Rebroadcast unregister notification */ | |
056925ab | 6423 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 6424 | |
748e2d93 | 6425 | __rtnl_unlock(); |
0115e8e3 | 6426 | rcu_barrier(); |
748e2d93 ED |
6427 | rtnl_lock(); |
6428 | ||
0115e8e3 | 6429 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
1da177e4 LT |
6430 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
6431 | &dev->state)) { | |
6432 | /* We must not have linkwatch events | |
6433 | * pending on unregister. If this | |
6434 | * happens, we simply run the queue | |
6435 | * unscheduled, resulting in a noop | |
6436 | * for this device. | |
6437 | */ | |
6438 | linkwatch_run_queue(); | |
6439 | } | |
6440 | ||
6756ae4b | 6441 | __rtnl_unlock(); |
1da177e4 LT |
6442 | |
6443 | rebroadcast_time = jiffies; | |
6444 | } | |
6445 | ||
6446 | msleep(250); | |
6447 | ||
29b4433d ED |
6448 | refcnt = netdev_refcnt_read(dev); |
6449 | ||
1da177e4 | 6450 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
6451 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
6452 | dev->name, refcnt); | |
1da177e4 LT |
6453 | warning_time = jiffies; |
6454 | } | |
6455 | } | |
6456 | } | |
6457 | ||
6458 | /* The sequence is: | |
6459 | * | |
6460 | * rtnl_lock(); | |
6461 | * ... | |
6462 | * register_netdevice(x1); | |
6463 | * register_netdevice(x2); | |
6464 | * ... | |
6465 | * unregister_netdevice(y1); | |
6466 | * unregister_netdevice(y2); | |
6467 | * ... | |
6468 | * rtnl_unlock(); | |
6469 | * free_netdev(y1); | |
6470 | * free_netdev(y2); | |
6471 | * | |
58ec3b4d | 6472 | * We are invoked by rtnl_unlock(). |
1da177e4 | 6473 | * This allows us to deal with problems: |
b17a7c17 | 6474 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
6475 | * without deadlocking with linkwatch via keventd. |
6476 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
6477 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
6478 | * |
6479 | * We must not return until all unregister events added during | |
6480 | * the interval the lock was held have been completed. | |
1da177e4 | 6481 | */ |
1da177e4 LT |
6482 | void netdev_run_todo(void) |
6483 | { | |
626ab0e6 | 6484 | struct list_head list; |
1da177e4 | 6485 | |
1da177e4 | 6486 | /* Snapshot list, allow later requests */ |
626ab0e6 | 6487 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
6488 | |
6489 | __rtnl_unlock(); | |
626ab0e6 | 6490 | |
0115e8e3 ED |
6491 | |
6492 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
6493 | if (!list_empty(&list)) |
6494 | rcu_barrier(); | |
6495 | ||
1da177e4 LT |
6496 | while (!list_empty(&list)) { |
6497 | struct net_device *dev | |
e5e26d75 | 6498 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
6499 | list_del(&dev->todo_list); |
6500 | ||
748e2d93 | 6501 | rtnl_lock(); |
0115e8e3 | 6502 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
748e2d93 | 6503 | __rtnl_unlock(); |
0115e8e3 | 6504 | |
b17a7c17 | 6505 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 6506 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
6507 | dev->name, dev->reg_state); |
6508 | dump_stack(); | |
6509 | continue; | |
6510 | } | |
1da177e4 | 6511 | |
b17a7c17 | 6512 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 6513 | |
152102c7 | 6514 | on_each_cpu(flush_backlog, dev, 1); |
6e583ce5 | 6515 | |
b17a7c17 | 6516 | netdev_wait_allrefs(dev); |
1da177e4 | 6517 | |
b17a7c17 | 6518 | /* paranoia */ |
29b4433d | 6519 | BUG_ON(netdev_refcnt_read(dev)); |
33d480ce ED |
6520 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
6521 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
547b792c | 6522 | WARN_ON(dev->dn_ptr); |
1da177e4 | 6523 | |
b17a7c17 SH |
6524 | if (dev->destructor) |
6525 | dev->destructor(dev); | |
9093bbb2 | 6526 | |
50624c93 EB |
6527 | /* Report a network device has been unregistered */ |
6528 | rtnl_lock(); | |
6529 | dev_net(dev)->dev_unreg_count--; | |
6530 | __rtnl_unlock(); | |
6531 | wake_up(&netdev_unregistering_wq); | |
6532 | ||
9093bbb2 SH |
6533 | /* Free network device */ |
6534 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 6535 | } |
1da177e4 LT |
6536 | } |
6537 | ||
3cfde79c BH |
6538 | /* Convert net_device_stats to rtnl_link_stats64. They have the same |
6539 | * fields in the same order, with only the type differing. | |
6540 | */ | |
77a1abf5 ED |
6541 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
6542 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
6543 | { |
6544 | #if BITS_PER_LONG == 64 | |
77a1abf5 ED |
6545 | BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats)); |
6546 | memcpy(stats64, netdev_stats, sizeof(*stats64)); | |
3cfde79c BH |
6547 | #else |
6548 | size_t i, n = sizeof(*stats64) / sizeof(u64); | |
6549 | const unsigned long *src = (const unsigned long *)netdev_stats; | |
6550 | u64 *dst = (u64 *)stats64; | |
6551 | ||
6552 | BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) != | |
6553 | sizeof(*stats64) / sizeof(u64)); | |
6554 | for (i = 0; i < n; i++) | |
6555 | dst[i] = src[i]; | |
6556 | #endif | |
6557 | } | |
77a1abf5 | 6558 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 6559 | |
eeda3fd6 SH |
6560 | /** |
6561 | * dev_get_stats - get network device statistics | |
6562 | * @dev: device to get statistics from | |
28172739 | 6563 | * @storage: place to store stats |
eeda3fd6 | 6564 | * |
d7753516 BH |
6565 | * Get network statistics from device. Return @storage. |
6566 | * The device driver may provide its own method by setting | |
6567 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
6568 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 6569 | */ |
d7753516 BH |
6570 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
6571 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 6572 | { |
eeda3fd6 SH |
6573 | const struct net_device_ops *ops = dev->netdev_ops; |
6574 | ||
28172739 ED |
6575 | if (ops->ndo_get_stats64) { |
6576 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
6577 | ops->ndo_get_stats64(dev, storage); |
6578 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 6579 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
6580 | } else { |
6581 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 6582 | } |
caf586e5 | 6583 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
015f0688 | 6584 | storage->tx_dropped += atomic_long_read(&dev->tx_dropped); |
28172739 | 6585 | return storage; |
c45d286e | 6586 | } |
eeda3fd6 | 6587 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 6588 | |
24824a09 | 6589 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 6590 | { |
24824a09 | 6591 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 6592 | |
24824a09 ED |
6593 | #ifdef CONFIG_NET_CLS_ACT |
6594 | if (queue) | |
6595 | return queue; | |
6596 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
6597 | if (!queue) | |
6598 | return NULL; | |
6599 | netdev_init_one_queue(dev, queue, NULL); | |
24824a09 ED |
6600 | queue->qdisc = &noop_qdisc; |
6601 | queue->qdisc_sleeping = &noop_qdisc; | |
6602 | rcu_assign_pointer(dev->ingress_queue, queue); | |
6603 | #endif | |
6604 | return queue; | |
bb949fbd DM |
6605 | } |
6606 | ||
2c60db03 ED |
6607 | static const struct ethtool_ops default_ethtool_ops; |
6608 | ||
d07d7507 SG |
6609 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
6610 | const struct ethtool_ops *ops) | |
6611 | { | |
6612 | if (dev->ethtool_ops == &default_ethtool_ops) | |
6613 | dev->ethtool_ops = ops; | |
6614 | } | |
6615 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
6616 | ||
74d332c1 ED |
6617 | void netdev_freemem(struct net_device *dev) |
6618 | { | |
6619 | char *addr = (char *)dev - dev->padded; | |
6620 | ||
4cb28970 | 6621 | kvfree(addr); |
74d332c1 ED |
6622 | } |
6623 | ||
1da177e4 | 6624 | /** |
36909ea4 | 6625 | * alloc_netdev_mqs - allocate network device |
c835a677 TG |
6626 | * @sizeof_priv: size of private data to allocate space for |
6627 | * @name: device name format string | |
6628 | * @name_assign_type: origin of device name | |
6629 | * @setup: callback to initialize device | |
6630 | * @txqs: the number of TX subqueues to allocate | |
6631 | * @rxqs: the number of RX subqueues to allocate | |
1da177e4 LT |
6632 | * |
6633 | * Allocates a struct net_device with private data area for driver use | |
90e51adf | 6634 | * and performs basic initialization. Also allocates subqueue structs |
36909ea4 | 6635 | * for each queue on the device. |
1da177e4 | 6636 | */ |
36909ea4 | 6637 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 6638 | unsigned char name_assign_type, |
36909ea4 TH |
6639 | void (*setup)(struct net_device *), |
6640 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 6641 | { |
1da177e4 | 6642 | struct net_device *dev; |
7943986c | 6643 | size_t alloc_size; |
1ce8e7b5 | 6644 | struct net_device *p; |
1da177e4 | 6645 | |
b6fe17d6 SH |
6646 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
6647 | ||
36909ea4 | 6648 | if (txqs < 1) { |
7b6cd1ce | 6649 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
6650 | return NULL; |
6651 | } | |
6652 | ||
a953be53 | 6653 | #ifdef CONFIG_SYSFS |
36909ea4 | 6654 | if (rxqs < 1) { |
7b6cd1ce | 6655 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
6656 | return NULL; |
6657 | } | |
6658 | #endif | |
6659 | ||
fd2ea0a7 | 6660 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
6661 | if (sizeof_priv) { |
6662 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 6663 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
6664 | alloc_size += sizeof_priv; |
6665 | } | |
6666 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 6667 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 6668 | |
74d332c1 ED |
6669 | p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
6670 | if (!p) | |
6671 | p = vzalloc(alloc_size); | |
62b5942a | 6672 | if (!p) |
1da177e4 | 6673 | return NULL; |
1da177e4 | 6674 | |
1ce8e7b5 | 6675 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 6676 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 6677 | |
29b4433d ED |
6678 | dev->pcpu_refcnt = alloc_percpu(int); |
6679 | if (!dev->pcpu_refcnt) | |
74d332c1 | 6680 | goto free_dev; |
ab9c73cc | 6681 | |
ab9c73cc | 6682 | if (dev_addr_init(dev)) |
29b4433d | 6683 | goto free_pcpu; |
ab9c73cc | 6684 | |
22bedad3 | 6685 | dev_mc_init(dev); |
a748ee24 | 6686 | dev_uc_init(dev); |
ccffad25 | 6687 | |
c346dca1 | 6688 | dev_net_set(dev, &init_net); |
1da177e4 | 6689 | |
8d3bdbd5 | 6690 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 6691 | dev->gso_max_segs = GSO_MAX_SEGS; |
fcbeb976 | 6692 | dev->gso_min_segs = 0; |
8d3bdbd5 | 6693 | |
8d3bdbd5 DM |
6694 | INIT_LIST_HEAD(&dev->napi_list); |
6695 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 6696 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 6697 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
6698 | INIT_LIST_HEAD(&dev->adj_list.upper); |
6699 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
6700 | INIT_LIST_HEAD(&dev->all_adj_list.upper); | |
6701 | INIT_LIST_HEAD(&dev->all_adj_list.lower); | |
02875878 | 6702 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
6703 | setup(dev); |
6704 | ||
36909ea4 TH |
6705 | dev->num_tx_queues = txqs; |
6706 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 6707 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 6708 | goto free_all; |
e8a0464c | 6709 | |
a953be53 | 6710 | #ifdef CONFIG_SYSFS |
36909ea4 TH |
6711 | dev->num_rx_queues = rxqs; |
6712 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 6713 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 6714 | goto free_all; |
df334545 | 6715 | #endif |
0a9627f2 | 6716 | |
1da177e4 | 6717 | strcpy(dev->name, name); |
c835a677 | 6718 | dev->name_assign_type = name_assign_type; |
cbda10fa | 6719 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
6720 | if (!dev->ethtool_ops) |
6721 | dev->ethtool_ops = &default_ethtool_ops; | |
1da177e4 | 6722 | return dev; |
ab9c73cc | 6723 | |
8d3bdbd5 DM |
6724 | free_all: |
6725 | free_netdev(dev); | |
6726 | return NULL; | |
6727 | ||
29b4433d ED |
6728 | free_pcpu: |
6729 | free_percpu(dev->pcpu_refcnt); | |
74d332c1 ED |
6730 | free_dev: |
6731 | netdev_freemem(dev); | |
ab9c73cc | 6732 | return NULL; |
1da177e4 | 6733 | } |
36909ea4 | 6734 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
6735 | |
6736 | /** | |
6737 | * free_netdev - free network device | |
6738 | * @dev: device | |
6739 | * | |
4ec93edb YH |
6740 | * This function does the last stage of destroying an allocated device |
6741 | * interface. The reference to the device object is released. | |
1da177e4 LT |
6742 | * If this is the last reference then it will be freed. |
6743 | */ | |
6744 | void free_netdev(struct net_device *dev) | |
6745 | { | |
d565b0a1 HX |
6746 | struct napi_struct *p, *n; |
6747 | ||
f3005d7f DL |
6748 | release_net(dev_net(dev)); |
6749 | ||
60877a32 | 6750 | netif_free_tx_queues(dev); |
a953be53 | 6751 | #ifdef CONFIG_SYSFS |
fe822240 TH |
6752 | kfree(dev->_rx); |
6753 | #endif | |
e8a0464c | 6754 | |
33d480ce | 6755 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 6756 | |
f001fde5 JP |
6757 | /* Flush device addresses */ |
6758 | dev_addr_flush(dev); | |
6759 | ||
d565b0a1 HX |
6760 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
6761 | netif_napi_del(p); | |
6762 | ||
29b4433d ED |
6763 | free_percpu(dev->pcpu_refcnt); |
6764 | dev->pcpu_refcnt = NULL; | |
6765 | ||
3041a069 | 6766 | /* Compatibility with error handling in drivers */ |
1da177e4 | 6767 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 6768 | netdev_freemem(dev); |
1da177e4 LT |
6769 | return; |
6770 | } | |
6771 | ||
6772 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
6773 | dev->reg_state = NETREG_RELEASED; | |
6774 | ||
43cb76d9 GKH |
6775 | /* will free via device release */ |
6776 | put_device(&dev->dev); | |
1da177e4 | 6777 | } |
d1b19dff | 6778 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 6779 | |
f0db275a SH |
6780 | /** |
6781 | * synchronize_net - Synchronize with packet receive processing | |
6782 | * | |
6783 | * Wait for packets currently being received to be done. | |
6784 | * Does not block later packets from starting. | |
6785 | */ | |
4ec93edb | 6786 | void synchronize_net(void) |
1da177e4 LT |
6787 | { |
6788 | might_sleep(); | |
be3fc413 ED |
6789 | if (rtnl_is_locked()) |
6790 | synchronize_rcu_expedited(); | |
6791 | else | |
6792 | synchronize_rcu(); | |
1da177e4 | 6793 | } |
d1b19dff | 6794 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
6795 | |
6796 | /** | |
44a0873d | 6797 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 6798 | * @dev: device |
44a0873d | 6799 | * @head: list |
6ebfbc06 | 6800 | * |
1da177e4 | 6801 | * This function shuts down a device interface and removes it |
d59b54b1 | 6802 | * from the kernel tables. |
44a0873d | 6803 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
6804 | * |
6805 | * Callers must hold the rtnl semaphore. You may want | |
6806 | * unregister_netdev() instead of this. | |
6807 | */ | |
6808 | ||
44a0873d | 6809 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 6810 | { |
a6620712 HX |
6811 | ASSERT_RTNL(); |
6812 | ||
44a0873d | 6813 | if (head) { |
9fdce099 | 6814 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
6815 | } else { |
6816 | rollback_registered(dev); | |
6817 | /* Finish processing unregister after unlock */ | |
6818 | net_set_todo(dev); | |
6819 | } | |
1da177e4 | 6820 | } |
44a0873d | 6821 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 6822 | |
9b5e383c ED |
6823 | /** |
6824 | * unregister_netdevice_many - unregister many devices | |
6825 | * @head: list of devices | |
87757a91 ED |
6826 | * |
6827 | * Note: As most callers use a stack allocated list_head, | |
6828 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
6829 | */ |
6830 | void unregister_netdevice_many(struct list_head *head) | |
6831 | { | |
6832 | struct net_device *dev; | |
6833 | ||
6834 | if (!list_empty(head)) { | |
6835 | rollback_registered_many(head); | |
6836 | list_for_each_entry(dev, head, unreg_list) | |
6837 | net_set_todo(dev); | |
87757a91 | 6838 | list_del(head); |
9b5e383c ED |
6839 | } |
6840 | } | |
63c8099d | 6841 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 6842 | |
1da177e4 LT |
6843 | /** |
6844 | * unregister_netdev - remove device from the kernel | |
6845 | * @dev: device | |
6846 | * | |
6847 | * This function shuts down a device interface and removes it | |
d59b54b1 | 6848 | * from the kernel tables. |
1da177e4 LT |
6849 | * |
6850 | * This is just a wrapper for unregister_netdevice that takes | |
6851 | * the rtnl semaphore. In general you want to use this and not | |
6852 | * unregister_netdevice. | |
6853 | */ | |
6854 | void unregister_netdev(struct net_device *dev) | |
6855 | { | |
6856 | rtnl_lock(); | |
6857 | unregister_netdevice(dev); | |
6858 | rtnl_unlock(); | |
6859 | } | |
1da177e4 LT |
6860 | EXPORT_SYMBOL(unregister_netdev); |
6861 | ||
ce286d32 EB |
6862 | /** |
6863 | * dev_change_net_namespace - move device to different nethost namespace | |
6864 | * @dev: device | |
6865 | * @net: network namespace | |
6866 | * @pat: If not NULL name pattern to try if the current device name | |
6867 | * is already taken in the destination network namespace. | |
6868 | * | |
6869 | * This function shuts down a device interface and moves it | |
6870 | * to a new network namespace. On success 0 is returned, on | |
6871 | * a failure a netagive errno code is returned. | |
6872 | * | |
6873 | * Callers must hold the rtnl semaphore. | |
6874 | */ | |
6875 | ||
6876 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
6877 | { | |
ce286d32 EB |
6878 | int err; |
6879 | ||
6880 | ASSERT_RTNL(); | |
6881 | ||
6882 | /* Don't allow namespace local devices to be moved. */ | |
6883 | err = -EINVAL; | |
6884 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
6885 | goto out; | |
6886 | ||
6887 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
6888 | if (dev->reg_state != NETREG_REGISTERED) |
6889 | goto out; | |
6890 | ||
6891 | /* Get out if there is nothing todo */ | |
6892 | err = 0; | |
878628fb | 6893 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
6894 | goto out; |
6895 | ||
6896 | /* Pick the destination device name, and ensure | |
6897 | * we can use it in the destination network namespace. | |
6898 | */ | |
6899 | err = -EEXIST; | |
d9031024 | 6900 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
6901 | /* We get here if we can't use the current device name */ |
6902 | if (!pat) | |
6903 | goto out; | |
828de4f6 | 6904 | if (dev_get_valid_name(net, dev, pat) < 0) |
ce286d32 EB |
6905 | goto out; |
6906 | } | |
6907 | ||
6908 | /* | |
6909 | * And now a mini version of register_netdevice unregister_netdevice. | |
6910 | */ | |
6911 | ||
6912 | /* If device is running close it first. */ | |
9b772652 | 6913 | dev_close(dev); |
ce286d32 EB |
6914 | |
6915 | /* And unlink it from device chain */ | |
6916 | err = -ENODEV; | |
6917 | unlist_netdevice(dev); | |
6918 | ||
6919 | synchronize_net(); | |
6920 | ||
6921 | /* Shutdown queueing discipline. */ | |
6922 | dev_shutdown(dev); | |
6923 | ||
6924 | /* Notify protocols, that we are about to destroy | |
6925 | this device. They should clean all the things. | |
3b27e105 DL |
6926 | |
6927 | Note that dev->reg_state stays at NETREG_REGISTERED. | |
6928 | This is wanted because this way 8021q and macvlan know | |
6929 | the device is just moving and can keep their slaves up. | |
ce286d32 EB |
6930 | */ |
6931 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
6549dd43 G |
6932 | rcu_barrier(); |
6933 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); | |
7f294054 | 6934 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); |
ce286d32 EB |
6935 | |
6936 | /* | |
6937 | * Flush the unicast and multicast chains | |
6938 | */ | |
a748ee24 | 6939 | dev_uc_flush(dev); |
22bedad3 | 6940 | dev_mc_flush(dev); |
ce286d32 | 6941 | |
4e66ae2e SH |
6942 | /* Send a netdev-removed uevent to the old namespace */ |
6943 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 6944 | netdev_adjacent_del_links(dev); |
4e66ae2e | 6945 | |
ce286d32 | 6946 | /* Actually switch the network namespace */ |
c346dca1 | 6947 | dev_net_set(dev, net); |
ce286d32 | 6948 | |
ce286d32 EB |
6949 | /* If there is an ifindex conflict assign a new one */ |
6950 | if (__dev_get_by_index(net, dev->ifindex)) { | |
6951 | int iflink = (dev->iflink == dev->ifindex); | |
6952 | dev->ifindex = dev_new_index(net); | |
6953 | if (iflink) | |
6954 | dev->iflink = dev->ifindex; | |
6955 | } | |
6956 | ||
4e66ae2e SH |
6957 | /* Send a netdev-add uevent to the new namespace */ |
6958 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
4c75431a | 6959 | netdev_adjacent_add_links(dev); |
4e66ae2e | 6960 | |
8b41d188 | 6961 | /* Fixup kobjects */ |
a1b3f594 | 6962 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 6963 | WARN_ON(err); |
ce286d32 EB |
6964 | |
6965 | /* Add the device back in the hashes */ | |
6966 | list_netdevice(dev); | |
6967 | ||
6968 | /* Notify protocols, that a new device appeared. */ | |
6969 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
6970 | ||
d90a909e EB |
6971 | /* |
6972 | * Prevent userspace races by waiting until the network | |
6973 | * device is fully setup before sending notifications. | |
6974 | */ | |
7f294054 | 6975 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 6976 | |
ce286d32 EB |
6977 | synchronize_net(); |
6978 | err = 0; | |
6979 | out: | |
6980 | return err; | |
6981 | } | |
463d0183 | 6982 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 6983 | |
1da177e4 LT |
6984 | static int dev_cpu_callback(struct notifier_block *nfb, |
6985 | unsigned long action, | |
6986 | void *ocpu) | |
6987 | { | |
6988 | struct sk_buff **list_skb; | |
1da177e4 LT |
6989 | struct sk_buff *skb; |
6990 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
6991 | struct softnet_data *sd, *oldsd; | |
6992 | ||
8bb78442 | 6993 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
6994 | return NOTIFY_OK; |
6995 | ||
6996 | local_irq_disable(); | |
6997 | cpu = smp_processor_id(); | |
6998 | sd = &per_cpu(softnet_data, cpu); | |
6999 | oldsd = &per_cpu(softnet_data, oldcpu); | |
7000 | ||
7001 | /* Find end of our completion_queue. */ | |
7002 | list_skb = &sd->completion_queue; | |
7003 | while (*list_skb) | |
7004 | list_skb = &(*list_skb)->next; | |
7005 | /* Append completion queue from offline CPU. */ | |
7006 | *list_skb = oldsd->completion_queue; | |
7007 | oldsd->completion_queue = NULL; | |
7008 | ||
1da177e4 | 7009 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
7010 | if (oldsd->output_queue) { |
7011 | *sd->output_queue_tailp = oldsd->output_queue; | |
7012 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
7013 | oldsd->output_queue = NULL; | |
7014 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
7015 | } | |
264524d5 HC |
7016 | /* Append NAPI poll list from offline CPU. */ |
7017 | if (!list_empty(&oldsd->poll_list)) { | |
7018 | list_splice_init(&oldsd->poll_list, &sd->poll_list); | |
7019 | raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
7020 | } | |
1da177e4 LT |
7021 | |
7022 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
7023 | local_irq_enable(); | |
7024 | ||
7025 | /* Process offline CPU's input_pkt_queue */ | |
76cc8b13 | 7026 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
ae78dbfa | 7027 | netif_rx_internal(skb); |
76cc8b13 | 7028 | input_queue_head_incr(oldsd); |
fec5e652 | 7029 | } |
76cc8b13 | 7030 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
ae78dbfa | 7031 | netif_rx_internal(skb); |
76cc8b13 TH |
7032 | input_queue_head_incr(oldsd); |
7033 | } | |
1da177e4 LT |
7034 | |
7035 | return NOTIFY_OK; | |
7036 | } | |
1da177e4 LT |
7037 | |
7038 | ||
7f353bf2 | 7039 | /** |
b63365a2 HX |
7040 | * netdev_increment_features - increment feature set by one |
7041 | * @all: current feature set | |
7042 | * @one: new feature set | |
7043 | * @mask: mask feature set | |
7f353bf2 HX |
7044 | * |
7045 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
7046 | * @one to the master device with current feature set @all. Will not |
7047 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 7048 | */ |
c8f44aff MM |
7049 | netdev_features_t netdev_increment_features(netdev_features_t all, |
7050 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 7051 | { |
1742f183 MM |
7052 | if (mask & NETIF_F_GEN_CSUM) |
7053 | mask |= NETIF_F_ALL_CSUM; | |
7054 | mask |= NETIF_F_VLAN_CHALLENGED; | |
7f353bf2 | 7055 | |
1742f183 MM |
7056 | all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask; |
7057 | all &= one | ~NETIF_F_ALL_FOR_ALL; | |
c6e1a0d1 | 7058 | |
1742f183 MM |
7059 | /* If one device supports hw checksumming, set for all. */ |
7060 | if (all & NETIF_F_GEN_CSUM) | |
7061 | all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM); | |
7f353bf2 HX |
7062 | |
7063 | return all; | |
7064 | } | |
b63365a2 | 7065 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 7066 | |
430f03cd | 7067 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
7068 | { |
7069 | int i; | |
7070 | struct hlist_head *hash; | |
7071 | ||
7072 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
7073 | if (hash != NULL) | |
7074 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
7075 | INIT_HLIST_HEAD(&hash[i]); | |
7076 | ||
7077 | return hash; | |
7078 | } | |
7079 | ||
881d966b | 7080 | /* Initialize per network namespace state */ |
4665079c | 7081 | static int __net_init netdev_init(struct net *net) |
881d966b | 7082 | { |
734b6541 RM |
7083 | if (net != &init_net) |
7084 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 7085 | |
30d97d35 PE |
7086 | net->dev_name_head = netdev_create_hash(); |
7087 | if (net->dev_name_head == NULL) | |
7088 | goto err_name; | |
881d966b | 7089 | |
30d97d35 PE |
7090 | net->dev_index_head = netdev_create_hash(); |
7091 | if (net->dev_index_head == NULL) | |
7092 | goto err_idx; | |
881d966b EB |
7093 | |
7094 | return 0; | |
30d97d35 PE |
7095 | |
7096 | err_idx: | |
7097 | kfree(net->dev_name_head); | |
7098 | err_name: | |
7099 | return -ENOMEM; | |
881d966b EB |
7100 | } |
7101 | ||
f0db275a SH |
7102 | /** |
7103 | * netdev_drivername - network driver for the device | |
7104 | * @dev: network device | |
f0db275a SH |
7105 | * |
7106 | * Determine network driver for device. | |
7107 | */ | |
3019de12 | 7108 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 7109 | { |
cf04a4c7 SH |
7110 | const struct device_driver *driver; |
7111 | const struct device *parent; | |
3019de12 | 7112 | const char *empty = ""; |
6579e57b AV |
7113 | |
7114 | parent = dev->dev.parent; | |
6579e57b | 7115 | if (!parent) |
3019de12 | 7116 | return empty; |
6579e57b AV |
7117 | |
7118 | driver = parent->driver; | |
7119 | if (driver && driver->name) | |
3019de12 DM |
7120 | return driver->name; |
7121 | return empty; | |
6579e57b AV |
7122 | } |
7123 | ||
6ea754eb JP |
7124 | static void __netdev_printk(const char *level, const struct net_device *dev, |
7125 | struct va_format *vaf) | |
256df2f3 | 7126 | { |
b004ff49 | 7127 | if (dev && dev->dev.parent) { |
6ea754eb JP |
7128 | dev_printk_emit(level[1] - '0', |
7129 | dev->dev.parent, | |
7130 | "%s %s %s%s: %pV", | |
7131 | dev_driver_string(dev->dev.parent), | |
7132 | dev_name(dev->dev.parent), | |
7133 | netdev_name(dev), netdev_reg_state(dev), | |
7134 | vaf); | |
b004ff49 | 7135 | } else if (dev) { |
6ea754eb JP |
7136 | printk("%s%s%s: %pV", |
7137 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 7138 | } else { |
6ea754eb | 7139 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 7140 | } |
256df2f3 JP |
7141 | } |
7142 | ||
6ea754eb JP |
7143 | void netdev_printk(const char *level, const struct net_device *dev, |
7144 | const char *format, ...) | |
256df2f3 JP |
7145 | { |
7146 | struct va_format vaf; | |
7147 | va_list args; | |
256df2f3 JP |
7148 | |
7149 | va_start(args, format); | |
7150 | ||
7151 | vaf.fmt = format; | |
7152 | vaf.va = &args; | |
7153 | ||
6ea754eb | 7154 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 7155 | |
256df2f3 | 7156 | va_end(args); |
256df2f3 JP |
7157 | } |
7158 | EXPORT_SYMBOL(netdev_printk); | |
7159 | ||
7160 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 7161 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 7162 | { \ |
256df2f3 JP |
7163 | struct va_format vaf; \ |
7164 | va_list args; \ | |
7165 | \ | |
7166 | va_start(args, fmt); \ | |
7167 | \ | |
7168 | vaf.fmt = fmt; \ | |
7169 | vaf.va = &args; \ | |
7170 | \ | |
6ea754eb | 7171 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 7172 | \ |
256df2f3 | 7173 | va_end(args); \ |
256df2f3 JP |
7174 | } \ |
7175 | EXPORT_SYMBOL(func); | |
7176 | ||
7177 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
7178 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
7179 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
7180 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
7181 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
7182 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
7183 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
7184 | ||
4665079c | 7185 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
7186 | { |
7187 | kfree(net->dev_name_head); | |
7188 | kfree(net->dev_index_head); | |
7189 | } | |
7190 | ||
022cbae6 | 7191 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
7192 | .init = netdev_init, |
7193 | .exit = netdev_exit, | |
7194 | }; | |
7195 | ||
4665079c | 7196 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 7197 | { |
e008b5fc | 7198 | struct net_device *dev, *aux; |
ce286d32 | 7199 | /* |
e008b5fc | 7200 | * Push all migratable network devices back to the |
ce286d32 EB |
7201 | * initial network namespace |
7202 | */ | |
7203 | rtnl_lock(); | |
e008b5fc | 7204 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 7205 | int err; |
aca51397 | 7206 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
7207 | |
7208 | /* Ignore unmoveable devices (i.e. loopback) */ | |
7209 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
7210 | continue; | |
7211 | ||
e008b5fc EB |
7212 | /* Leave virtual devices for the generic cleanup */ |
7213 | if (dev->rtnl_link_ops) | |
7214 | continue; | |
d0c082ce | 7215 | |
25985edc | 7216 | /* Push remaining network devices to init_net */ |
aca51397 PE |
7217 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
7218 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 7219 | if (err) { |
7b6cd1ce JP |
7220 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
7221 | __func__, dev->name, err); | |
aca51397 | 7222 | BUG(); |
ce286d32 EB |
7223 | } |
7224 | } | |
7225 | rtnl_unlock(); | |
7226 | } | |
7227 | ||
50624c93 EB |
7228 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
7229 | { | |
7230 | /* Return with the rtnl_lock held when there are no network | |
7231 | * devices unregistering in any network namespace in net_list. | |
7232 | */ | |
7233 | struct net *net; | |
7234 | bool unregistering; | |
7235 | DEFINE_WAIT(wait); | |
7236 | ||
7237 | for (;;) { | |
7238 | prepare_to_wait(&netdev_unregistering_wq, &wait, | |
7239 | TASK_UNINTERRUPTIBLE); | |
7240 | unregistering = false; | |
7241 | rtnl_lock(); | |
7242 | list_for_each_entry(net, net_list, exit_list) { | |
7243 | if (net->dev_unreg_count > 0) { | |
7244 | unregistering = true; | |
7245 | break; | |
7246 | } | |
7247 | } | |
7248 | if (!unregistering) | |
7249 | break; | |
7250 | __rtnl_unlock(); | |
7251 | schedule(); | |
7252 | } | |
7253 | finish_wait(&netdev_unregistering_wq, &wait); | |
7254 | } | |
7255 | ||
04dc7f6b EB |
7256 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
7257 | { | |
7258 | /* At exit all network devices most be removed from a network | |
b595076a | 7259 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
7260 | * Do this across as many network namespaces as possible to |
7261 | * improve batching efficiency. | |
7262 | */ | |
7263 | struct net_device *dev; | |
7264 | struct net *net; | |
7265 | LIST_HEAD(dev_kill_list); | |
7266 | ||
50624c93 EB |
7267 | /* To prevent network device cleanup code from dereferencing |
7268 | * loopback devices or network devices that have been freed | |
7269 | * wait here for all pending unregistrations to complete, | |
7270 | * before unregistring the loopback device and allowing the | |
7271 | * network namespace be freed. | |
7272 | * | |
7273 | * The netdev todo list containing all network devices | |
7274 | * unregistrations that happen in default_device_exit_batch | |
7275 | * will run in the rtnl_unlock() at the end of | |
7276 | * default_device_exit_batch. | |
7277 | */ | |
7278 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
7279 | list_for_each_entry(net, net_list, exit_list) { |
7280 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 7281 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
7282 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
7283 | else | |
7284 | unregister_netdevice_queue(dev, &dev_kill_list); | |
7285 | } | |
7286 | } | |
7287 | unregister_netdevice_many(&dev_kill_list); | |
7288 | rtnl_unlock(); | |
7289 | } | |
7290 | ||
022cbae6 | 7291 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 7292 | .exit = default_device_exit, |
04dc7f6b | 7293 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
7294 | }; |
7295 | ||
1da177e4 LT |
7296 | /* |
7297 | * Initialize the DEV module. At boot time this walks the device list and | |
7298 | * unhooks any devices that fail to initialise (normally hardware not | |
7299 | * present) and leaves us with a valid list of present and active devices. | |
7300 | * | |
7301 | */ | |
7302 | ||
7303 | /* | |
7304 | * This is called single threaded during boot, so no need | |
7305 | * to take the rtnl semaphore. | |
7306 | */ | |
7307 | static int __init net_dev_init(void) | |
7308 | { | |
7309 | int i, rc = -ENOMEM; | |
7310 | ||
7311 | BUG_ON(!dev_boot_phase); | |
7312 | ||
1da177e4 LT |
7313 | if (dev_proc_init()) |
7314 | goto out; | |
7315 | ||
8b41d188 | 7316 | if (netdev_kobject_init()) |
1da177e4 LT |
7317 | goto out; |
7318 | ||
7319 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 7320 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
7321 | INIT_LIST_HEAD(&ptype_base[i]); |
7322 | ||
62532da9 VY |
7323 | INIT_LIST_HEAD(&offload_base); |
7324 | ||
881d966b EB |
7325 | if (register_pernet_subsys(&netdev_net_ops)) |
7326 | goto out; | |
1da177e4 LT |
7327 | |
7328 | /* | |
7329 | * Initialise the packet receive queues. | |
7330 | */ | |
7331 | ||
6f912042 | 7332 | for_each_possible_cpu(i) { |
e36fa2f7 | 7333 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 7334 | |
e36fa2f7 | 7335 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 7336 | skb_queue_head_init(&sd->process_queue); |
e36fa2f7 | 7337 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 7338 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 7339 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
7340 | sd->csd.func = rps_trigger_softirq; |
7341 | sd->csd.info = sd; | |
e36fa2f7 | 7342 | sd->cpu = i; |
1e94d72f | 7343 | #endif |
0a9627f2 | 7344 | |
e36fa2f7 ED |
7345 | sd->backlog.poll = process_backlog; |
7346 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
7347 | } |
7348 | ||
1da177e4 LT |
7349 | dev_boot_phase = 0; |
7350 | ||
505d4f73 EB |
7351 | /* The loopback device is special if any other network devices |
7352 | * is present in a network namespace the loopback device must | |
7353 | * be present. Since we now dynamically allocate and free the | |
7354 | * loopback device ensure this invariant is maintained by | |
7355 | * keeping the loopback device as the first device on the | |
7356 | * list of network devices. Ensuring the loopback devices | |
7357 | * is the first device that appears and the last network device | |
7358 | * that disappears. | |
7359 | */ | |
7360 | if (register_pernet_device(&loopback_net_ops)) | |
7361 | goto out; | |
7362 | ||
7363 | if (register_pernet_device(&default_device_ops)) | |
7364 | goto out; | |
7365 | ||
962cf36c CM |
7366 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
7367 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 LT |
7368 | |
7369 | hotcpu_notifier(dev_cpu_callback, 0); | |
7370 | dst_init(); | |
1da177e4 LT |
7371 | rc = 0; |
7372 | out: | |
7373 | return rc; | |
7374 | } | |
7375 | ||
7376 | subsys_initcall(net_dev_init); |