2 * NET3 Protocol independent device support routines.
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.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
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>
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
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
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
51 * Rudi Cilibrasi : Pass the right thing to
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
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
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
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.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>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/stat.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <net/xfrm.h>
105 #include <linux/highmem.h>
106 #include <linux/init.h>
107 #include <linux/module.h>
108 #include <linux/netpoll.h>
109 #include <linux/rcupdate.h>
110 #include <linux/delay.h>
111 #include <net/iw_handler.h>
112 #include <asm/current.h>
113 #include <linux/audit.h>
114 #include <linux/dmaengine.h>
115 #include <linux/err.h>
116 #include <linux/ctype.h>
117 #include <linux/if_arp.h>
118 #include <linux/if_vlan.h>
119 #include <linux/ip.h>
121 #include <linux/ipv6.h>
122 #include <linux/in.h>
123 #include <linux/jhash.h>
124 #include <linux/random.h>
125 #include <trace/events/napi.h>
126 #include <trace/events/net.h>
127 #include <trace/events/skb.h>
128 #include <linux/pci.h>
129 #include <linux/inetdevice.h>
130 #include <linux/cpu_rmap.h>
131 #include <linux/static_key.h>
133 #include "net-sysfs.h"
135 /* Instead of increasing this, you should create a hash table. */
136 #define MAX_GRO_SKBS 8
138 /* This should be increased if a protocol with a bigger head is added. */
139 #define GRO_MAX_HEAD (MAX_HEADER + 128)
141 static DEFINE_SPINLOCK(ptype_lock
);
142 static DEFINE_SPINLOCK(offload_lock
);
143 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
144 struct list_head ptype_all __read_mostly
; /* Taps */
145 static struct list_head offload_base __read_mostly
;
148 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
151 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
153 * Writers must hold the rtnl semaphore while they loop through the
154 * dev_base_head list, and hold dev_base_lock for writing when they do the
155 * actual updates. This allows pure readers to access the list even
156 * while a writer is preparing to update it.
158 * To put it another way, dev_base_lock is held for writing only to
159 * protect against pure readers; the rtnl semaphore provides the
160 * protection against other writers.
162 * See, for example usages, register_netdevice() and
163 * unregister_netdevice(), which must be called with the rtnl
166 DEFINE_RWLOCK(dev_base_lock
);
167 EXPORT_SYMBOL(dev_base_lock
);
169 seqcount_t devnet_rename_seq
;
171 static inline void dev_base_seq_inc(struct net
*net
)
173 while (++net
->dev_base_seq
== 0);
176 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
178 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
180 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
183 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
185 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
188 static inline void rps_lock(struct softnet_data
*sd
)
191 spin_lock(&sd
->input_pkt_queue
.lock
);
195 static inline void rps_unlock(struct softnet_data
*sd
)
198 spin_unlock(&sd
->input_pkt_queue
.lock
);
202 /* Device list insertion */
203 static int list_netdevice(struct net_device
*dev
)
205 struct net
*net
= dev_net(dev
);
209 write_lock_bh(&dev_base_lock
);
210 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
211 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
212 hlist_add_head_rcu(&dev
->index_hlist
,
213 dev_index_hash(net
, dev
->ifindex
));
214 write_unlock_bh(&dev_base_lock
);
216 dev_base_seq_inc(net
);
221 /* Device list removal
222 * caller must respect a RCU grace period before freeing/reusing dev
224 static void unlist_netdevice(struct net_device
*dev
)
228 /* Unlink dev from the device chain */
229 write_lock_bh(&dev_base_lock
);
230 list_del_rcu(&dev
->dev_list
);
231 hlist_del_rcu(&dev
->name_hlist
);
232 hlist_del_rcu(&dev
->index_hlist
);
233 write_unlock_bh(&dev_base_lock
);
235 dev_base_seq_inc(dev_net(dev
));
242 static RAW_NOTIFIER_HEAD(netdev_chain
);
245 * Device drivers call our routines to queue packets here. We empty the
246 * queue in the local softnet handler.
249 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
250 EXPORT_PER_CPU_SYMBOL(softnet_data
);
252 #ifdef CONFIG_LOCKDEP
254 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
255 * according to dev->type
257 static const unsigned short netdev_lock_type
[] =
258 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
259 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
260 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
261 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
262 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
263 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
264 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
265 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
266 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
267 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
268 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
269 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
270 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
271 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
272 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
274 static const char *const netdev_lock_name
[] =
275 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
276 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
277 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
278 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
279 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
280 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
281 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
282 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
283 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
284 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
285 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
286 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
287 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
288 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
289 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
291 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
292 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
294 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
298 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
299 if (netdev_lock_type
[i
] == dev_type
)
301 /* the last key is used by default */
302 return ARRAY_SIZE(netdev_lock_type
) - 1;
305 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
306 unsigned short dev_type
)
310 i
= netdev_lock_pos(dev_type
);
311 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
312 netdev_lock_name
[i
]);
315 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
319 i
= netdev_lock_pos(dev
->type
);
320 lockdep_set_class_and_name(&dev
->addr_list_lock
,
321 &netdev_addr_lock_key
[i
],
322 netdev_lock_name
[i
]);
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
326 unsigned short dev_type
)
329 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
334 /*******************************************************************************
336 Protocol management and registration routines
338 *******************************************************************************/
341 * Add a protocol ID to the list. Now that the input handler is
342 * smarter we can dispense with all the messy stuff that used to be
345 * BEWARE!!! Protocol handlers, mangling input packets,
346 * MUST BE last in hash buckets and checking protocol handlers
347 * MUST start from promiscuous ptype_all chain in net_bh.
348 * It is true now, do not change it.
349 * Explanation follows: if protocol handler, mangling packet, will
350 * be the first on list, it is not able to sense, that packet
351 * is cloned and should be copied-on-write, so that it will
352 * change it and subsequent readers will get broken packet.
356 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
358 if (pt
->type
== htons(ETH_P_ALL
))
361 return &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
365 * dev_add_pack - add packet handler
366 * @pt: packet type declaration
368 * Add a protocol handler to the networking stack. The passed &packet_type
369 * is linked into kernel lists and may not be freed until it has been
370 * removed from the kernel lists.
372 * This call does not sleep therefore it can not
373 * guarantee all CPU's that are in middle of receiving packets
374 * will see the new packet type (until the next received packet).
377 void dev_add_pack(struct packet_type
*pt
)
379 struct list_head
*head
= ptype_head(pt
);
381 spin_lock(&ptype_lock
);
382 list_add_rcu(&pt
->list
, head
);
383 spin_unlock(&ptype_lock
);
385 EXPORT_SYMBOL(dev_add_pack
);
388 * __dev_remove_pack - remove packet handler
389 * @pt: packet type declaration
391 * Remove a protocol handler that was previously added to the kernel
392 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
393 * from the kernel lists and can be freed or reused once this function
396 * The packet type might still be in use by receivers
397 * and must not be freed until after all the CPU's have gone
398 * through a quiescent state.
400 void __dev_remove_pack(struct packet_type
*pt
)
402 struct list_head
*head
= ptype_head(pt
);
403 struct packet_type
*pt1
;
405 spin_lock(&ptype_lock
);
407 list_for_each_entry(pt1
, head
, list
) {
409 list_del_rcu(&pt
->list
);
414 pr_warn("dev_remove_pack: %p not found\n", pt
);
416 spin_unlock(&ptype_lock
);
418 EXPORT_SYMBOL(__dev_remove_pack
);
421 * dev_remove_pack - remove packet handler
422 * @pt: packet type declaration
424 * Remove a protocol handler that was previously added to the kernel
425 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
426 * from the kernel lists and can be freed or reused once this function
429 * This call sleeps to guarantee that no CPU is looking at the packet
432 void dev_remove_pack(struct packet_type
*pt
)
434 __dev_remove_pack(pt
);
438 EXPORT_SYMBOL(dev_remove_pack
);
442 * dev_add_offload - register offload handlers
443 * @po: protocol offload declaration
445 * Add protocol offload handlers to the networking stack. The passed
446 * &proto_offload is linked into kernel lists and may not be freed until
447 * it has been removed from the kernel lists.
449 * This call does not sleep therefore it can not
450 * guarantee all CPU's that are in middle of receiving packets
451 * will see the new offload handlers (until the next received packet).
453 void dev_add_offload(struct packet_offload
*po
)
455 struct list_head
*head
= &offload_base
;
457 spin_lock(&offload_lock
);
458 list_add_rcu(&po
->list
, head
);
459 spin_unlock(&offload_lock
);
461 EXPORT_SYMBOL(dev_add_offload
);
464 * __dev_remove_offload - remove offload handler
465 * @po: packet offload declaration
467 * Remove a protocol offload handler that was previously added to the
468 * kernel offload handlers by dev_add_offload(). The passed &offload_type
469 * is removed from the kernel lists and can be freed or reused once this
472 * The packet type might still be in use by receivers
473 * and must not be freed until after all the CPU's have gone
474 * through a quiescent state.
476 void __dev_remove_offload(struct packet_offload
*po
)
478 struct list_head
*head
= &offload_base
;
479 struct packet_offload
*po1
;
481 spin_lock(&offload_lock
);
483 list_for_each_entry(po1
, head
, list
) {
485 list_del_rcu(&po
->list
);
490 pr_warn("dev_remove_offload: %p not found\n", po
);
492 spin_unlock(&offload_lock
);
494 EXPORT_SYMBOL(__dev_remove_offload
);
497 * dev_remove_offload - remove packet offload handler
498 * @po: packet offload declaration
500 * Remove a packet offload handler that was previously added to the kernel
501 * offload handlers by dev_add_offload(). The passed &offload_type is
502 * removed from the kernel lists and can be freed or reused once this
505 * This call sleeps to guarantee that no CPU is looking at the packet
508 void dev_remove_offload(struct packet_offload
*po
)
510 __dev_remove_offload(po
);
514 EXPORT_SYMBOL(dev_remove_offload
);
516 /******************************************************************************
518 Device Boot-time Settings Routines
520 *******************************************************************************/
522 /* Boot time configuration table */
523 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
526 * netdev_boot_setup_add - add new setup entry
527 * @name: name of the device
528 * @map: configured settings for the device
530 * Adds new setup entry to the dev_boot_setup list. The function
531 * returns 0 on error and 1 on success. This is a generic routine to
534 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
536 struct netdev_boot_setup
*s
;
540 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
541 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
542 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
543 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
544 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
549 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
553 * netdev_boot_setup_check - check boot time settings
554 * @dev: the netdevice
556 * Check boot time settings for the device.
557 * The found settings are set for the device to be used
558 * later in the device probing.
559 * Returns 0 if no settings found, 1 if they are.
561 int netdev_boot_setup_check(struct net_device
*dev
)
563 struct netdev_boot_setup
*s
= dev_boot_setup
;
566 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
567 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
568 !strcmp(dev
->name
, s
[i
].name
)) {
569 dev
->irq
= s
[i
].map
.irq
;
570 dev
->base_addr
= s
[i
].map
.base_addr
;
571 dev
->mem_start
= s
[i
].map
.mem_start
;
572 dev
->mem_end
= s
[i
].map
.mem_end
;
578 EXPORT_SYMBOL(netdev_boot_setup_check
);
582 * netdev_boot_base - get address from boot time settings
583 * @prefix: prefix for network device
584 * @unit: id for network device
586 * Check boot time settings for the base address of device.
587 * The found settings are set for the device to be used
588 * later in the device probing.
589 * Returns 0 if no settings found.
591 unsigned long netdev_boot_base(const char *prefix
, int unit
)
593 const struct netdev_boot_setup
*s
= dev_boot_setup
;
597 sprintf(name
, "%s%d", prefix
, unit
);
600 * If device already registered then return base of 1
601 * to indicate not to probe for this interface
603 if (__dev_get_by_name(&init_net
, name
))
606 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
607 if (!strcmp(name
, s
[i
].name
))
608 return s
[i
].map
.base_addr
;
613 * Saves at boot time configured settings for any netdevice.
615 int __init
netdev_boot_setup(char *str
)
620 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
625 memset(&map
, 0, sizeof(map
));
629 map
.base_addr
= ints
[2];
631 map
.mem_start
= ints
[3];
633 map
.mem_end
= ints
[4];
635 /* Add new entry to the list */
636 return netdev_boot_setup_add(str
, &map
);
639 __setup("netdev=", netdev_boot_setup
);
641 /*******************************************************************************
643 Device Interface Subroutines
645 *******************************************************************************/
648 * __dev_get_by_name - find a device by its name
649 * @net: the applicable net namespace
650 * @name: name to find
652 * Find an interface by name. Must be called under RTNL semaphore
653 * or @dev_base_lock. If the name is found a pointer to the device
654 * is returned. If the name is not found then %NULL is returned. The
655 * reference counters are not incremented so the caller must be
656 * careful with locks.
659 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
661 struct net_device
*dev
;
662 struct hlist_head
*head
= dev_name_hash(net
, name
);
664 hlist_for_each_entry(dev
, head
, name_hlist
)
665 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
670 EXPORT_SYMBOL(__dev_get_by_name
);
673 * dev_get_by_name_rcu - find a device by its name
674 * @net: the applicable net namespace
675 * @name: name to find
677 * Find an interface by name.
678 * If the name is found a pointer to the device is returned.
679 * If the name is not found then %NULL is returned.
680 * The reference counters are not incremented so the caller must be
681 * careful with locks. The caller must hold RCU lock.
684 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
686 struct net_device
*dev
;
687 struct hlist_head
*head
= dev_name_hash(net
, name
);
689 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
690 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
695 EXPORT_SYMBOL(dev_get_by_name_rcu
);
698 * dev_get_by_name - find a device by its name
699 * @net: the applicable net namespace
700 * @name: name to find
702 * Find an interface by name. This can be called from any
703 * context and does its own locking. The returned handle has
704 * the usage count incremented and the caller must use dev_put() to
705 * release it when it is no longer needed. %NULL is returned if no
706 * matching device is found.
709 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
711 struct net_device
*dev
;
714 dev
= dev_get_by_name_rcu(net
, name
);
720 EXPORT_SYMBOL(dev_get_by_name
);
723 * __dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns %NULL if the device
728 * is not found or a pointer to the device. The device has not
729 * had its reference counter increased so the caller must be careful
730 * about locking. The caller must hold either the RTNL semaphore
734 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
736 struct net_device
*dev
;
737 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
739 hlist_for_each_entry(dev
, head
, index_hlist
)
740 if (dev
->ifindex
== ifindex
)
745 EXPORT_SYMBOL(__dev_get_by_index
);
748 * dev_get_by_index_rcu - find a device by its ifindex
749 * @net: the applicable net namespace
750 * @ifindex: index of device
752 * Search for an interface by index. Returns %NULL if the device
753 * is not found or a pointer to the device. The device has not
754 * had its reference counter increased so the caller must be careful
755 * about locking. The caller must hold RCU lock.
758 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
760 struct net_device
*dev
;
761 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
763 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
764 if (dev
->ifindex
== ifindex
)
769 EXPORT_SYMBOL(dev_get_by_index_rcu
);
773 * dev_get_by_index - find a device by its ifindex
774 * @net: the applicable net namespace
775 * @ifindex: index of device
777 * Search for an interface by index. Returns NULL if the device
778 * is not found or a pointer to the device. The device returned has
779 * had a reference added and the pointer is safe until the user calls
780 * dev_put to indicate they have finished with it.
783 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
785 struct net_device
*dev
;
788 dev
= dev_get_by_index_rcu(net
, ifindex
);
794 EXPORT_SYMBOL(dev_get_by_index
);
797 * dev_getbyhwaddr_rcu - find a device by its hardware address
798 * @net: the applicable net namespace
799 * @type: media type of device
800 * @ha: hardware address
802 * Search for an interface by MAC address. Returns NULL if the device
803 * is not found or a pointer to the device.
804 * The caller must hold RCU or RTNL.
805 * The returned device has not had its ref count increased
806 * and the caller must therefore be careful about locking
810 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
813 struct net_device
*dev
;
815 for_each_netdev_rcu(net
, dev
)
816 if (dev
->type
== type
&&
817 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
822 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
824 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
826 struct net_device
*dev
;
829 for_each_netdev(net
, dev
)
830 if (dev
->type
== type
)
835 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
837 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
839 struct net_device
*dev
, *ret
= NULL
;
842 for_each_netdev_rcu(net
, dev
)
843 if (dev
->type
== type
) {
851 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
854 * dev_get_by_flags_rcu - find any device with given flags
855 * @net: the applicable net namespace
856 * @if_flags: IFF_* values
857 * @mask: bitmask of bits in if_flags to check
859 * Search for any interface with the given flags. Returns NULL if a device
860 * is not found or a pointer to the device. Must be called inside
861 * rcu_read_lock(), and result refcount is unchanged.
864 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
867 struct net_device
*dev
, *ret
;
870 for_each_netdev_rcu(net
, dev
) {
871 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
878 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
881 * dev_valid_name - check if name is okay for network device
884 * Network device names need to be valid file names to
885 * to allow sysfs to work. We also disallow any kind of
888 bool dev_valid_name(const char *name
)
892 if (strlen(name
) >= IFNAMSIZ
)
894 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
898 if (*name
== '/' || isspace(*name
))
904 EXPORT_SYMBOL(dev_valid_name
);
907 * __dev_alloc_name - allocate a name for a device
908 * @net: network namespace to allocate the device name in
909 * @name: name format string
910 * @buf: scratch buffer and result name string
912 * Passed a format string - eg "lt%d" it will try and find a suitable
913 * id. It scans list of devices to build up a free map, then chooses
914 * the first empty slot. The caller must hold the dev_base or rtnl lock
915 * while allocating the name and adding the device in order to avoid
917 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
918 * Returns the number of the unit assigned or a negative errno code.
921 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
925 const int max_netdevices
= 8*PAGE_SIZE
;
926 unsigned long *inuse
;
927 struct net_device
*d
;
929 p
= strnchr(name
, IFNAMSIZ
-1, '%');
932 * Verify the string as this thing may have come from
933 * the user. There must be either one "%d" and no other "%"
936 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
939 /* Use one page as a bit array of possible slots */
940 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
944 for_each_netdev(net
, d
) {
945 if (!sscanf(d
->name
, name
, &i
))
947 if (i
< 0 || i
>= max_netdevices
)
950 /* avoid cases where sscanf is not exact inverse of printf */
951 snprintf(buf
, IFNAMSIZ
, name
, i
);
952 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
956 i
= find_first_zero_bit(inuse
, max_netdevices
);
957 free_page((unsigned long) inuse
);
961 snprintf(buf
, IFNAMSIZ
, name
, i
);
962 if (!__dev_get_by_name(net
, buf
))
965 /* It is possible to run out of possible slots
966 * when the name is long and there isn't enough space left
967 * for the digits, or if all bits are used.
973 * dev_alloc_name - allocate a name for a device
975 * @name: name format string
977 * Passed a format string - eg "lt%d" it will try and find a suitable
978 * id. It scans list of devices to build up a free map, then chooses
979 * the first empty slot. The caller must hold the dev_base or rtnl lock
980 * while allocating the name and adding the device in order to avoid
982 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
983 * Returns the number of the unit assigned or a negative errno code.
986 int dev_alloc_name(struct net_device
*dev
, const char *name
)
992 BUG_ON(!dev_net(dev
));
994 ret
= __dev_alloc_name(net
, name
, buf
);
996 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
999 EXPORT_SYMBOL(dev_alloc_name
);
1001 static int dev_alloc_name_ns(struct net
*net
,
1002 struct net_device
*dev
,
1008 ret
= __dev_alloc_name(net
, name
, buf
);
1010 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1014 static int dev_get_valid_name(struct net
*net
,
1015 struct net_device
*dev
,
1020 if (!dev_valid_name(name
))
1023 if (strchr(name
, '%'))
1024 return dev_alloc_name_ns(net
, dev
, name
);
1025 else if (__dev_get_by_name(net
, name
))
1027 else if (dev
->name
!= name
)
1028 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1034 * dev_change_name - change name of a device
1036 * @newname: name (or format string) must be at least IFNAMSIZ
1038 * Change name of a device, can pass format strings "eth%d".
1041 int dev_change_name(struct net_device
*dev
, const char *newname
)
1043 char oldname
[IFNAMSIZ
];
1049 BUG_ON(!dev_net(dev
));
1052 if (dev
->flags
& IFF_UP
)
1055 write_seqcount_begin(&devnet_rename_seq
);
1057 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1058 write_seqcount_end(&devnet_rename_seq
);
1062 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1064 err
= dev_get_valid_name(net
, dev
, newname
);
1066 write_seqcount_end(&devnet_rename_seq
);
1071 ret
= device_rename(&dev
->dev
, dev
->name
);
1073 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1074 write_seqcount_end(&devnet_rename_seq
);
1078 write_seqcount_end(&devnet_rename_seq
);
1080 write_lock_bh(&dev_base_lock
);
1081 hlist_del_rcu(&dev
->name_hlist
);
1082 write_unlock_bh(&dev_base_lock
);
1086 write_lock_bh(&dev_base_lock
);
1087 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1088 write_unlock_bh(&dev_base_lock
);
1090 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1091 ret
= notifier_to_errno(ret
);
1094 /* err >= 0 after dev_alloc_name() or stores the first errno */
1097 write_seqcount_begin(&devnet_rename_seq
);
1098 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1101 pr_err("%s: name change rollback failed: %d\n",
1110 * dev_set_alias - change ifalias of a device
1112 * @alias: name up to IFALIASZ
1113 * @len: limit of bytes to copy from info
1115 * Set ifalias for a device,
1117 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1123 if (len
>= IFALIASZ
)
1127 kfree(dev
->ifalias
);
1128 dev
->ifalias
= NULL
;
1132 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1135 dev
->ifalias
= new_ifalias
;
1137 strlcpy(dev
->ifalias
, alias
, len
+1);
1143 * netdev_features_change - device changes features
1144 * @dev: device to cause notification
1146 * Called to indicate a device has changed features.
1148 void netdev_features_change(struct net_device
*dev
)
1150 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1152 EXPORT_SYMBOL(netdev_features_change
);
1155 * netdev_state_change - device changes state
1156 * @dev: device to cause notification
1158 * Called to indicate a device has changed state. This function calls
1159 * the notifier chains for netdev_chain and sends a NEWLINK message
1160 * to the routing socket.
1162 void netdev_state_change(struct net_device
*dev
)
1164 if (dev
->flags
& IFF_UP
) {
1165 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1166 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1169 EXPORT_SYMBOL(netdev_state_change
);
1172 * netdev_notify_peers - notify network peers about existence of @dev
1173 * @dev: network device
1175 * Generate traffic such that interested network peers are aware of
1176 * @dev, such as by generating a gratuitous ARP. This may be used when
1177 * a device wants to inform the rest of the network about some sort of
1178 * reconfiguration such as a failover event or virtual machine
1181 void netdev_notify_peers(struct net_device
*dev
)
1184 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1187 EXPORT_SYMBOL(netdev_notify_peers
);
1189 static int __dev_open(struct net_device
*dev
)
1191 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1196 if (!netif_device_present(dev
))
1199 /* Block netpoll from trying to do any rx path servicing.
1200 * If we don't do this there is a chance ndo_poll_controller
1201 * or ndo_poll may be running while we open the device
1203 ret
= netpoll_rx_disable(dev
);
1207 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1208 ret
= notifier_to_errno(ret
);
1212 set_bit(__LINK_STATE_START
, &dev
->state
);
1214 if (ops
->ndo_validate_addr
)
1215 ret
= ops
->ndo_validate_addr(dev
);
1217 if (!ret
&& ops
->ndo_open
)
1218 ret
= ops
->ndo_open(dev
);
1220 netpoll_rx_enable(dev
);
1223 clear_bit(__LINK_STATE_START
, &dev
->state
);
1225 dev
->flags
|= IFF_UP
;
1226 net_dmaengine_get();
1227 dev_set_rx_mode(dev
);
1229 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1236 * dev_open - prepare an interface for use.
1237 * @dev: device to open
1239 * Takes a device from down to up state. The device's private open
1240 * function is invoked and then the multicast lists are loaded. Finally
1241 * the device is moved into the up state and a %NETDEV_UP message is
1242 * sent to the netdev notifier chain.
1244 * Calling this function on an active interface is a nop. On a failure
1245 * a negative errno code is returned.
1247 int dev_open(struct net_device
*dev
)
1251 if (dev
->flags
& IFF_UP
)
1254 ret
= __dev_open(dev
);
1258 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1259 call_netdevice_notifiers(NETDEV_UP
, dev
);
1263 EXPORT_SYMBOL(dev_open
);
1265 static int __dev_close_many(struct list_head
*head
)
1267 struct net_device
*dev
;
1272 list_for_each_entry(dev
, head
, unreg_list
) {
1273 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1275 clear_bit(__LINK_STATE_START
, &dev
->state
);
1277 /* Synchronize to scheduled poll. We cannot touch poll list, it
1278 * can be even on different cpu. So just clear netif_running().
1280 * dev->stop() will invoke napi_disable() on all of it's
1281 * napi_struct instances on this device.
1283 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1286 dev_deactivate_many(head
);
1288 list_for_each_entry(dev
, head
, unreg_list
) {
1289 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1292 * Call the device specific close. This cannot fail.
1293 * Only if device is UP
1295 * We allow it to be called even after a DETACH hot-plug
1301 dev
->flags
&= ~IFF_UP
;
1302 net_dmaengine_put();
1308 static int __dev_close(struct net_device
*dev
)
1313 /* Temporarily disable netpoll until the interface is down */
1314 retval
= netpoll_rx_disable(dev
);
1318 list_add(&dev
->unreg_list
, &single
);
1319 retval
= __dev_close_many(&single
);
1322 netpoll_rx_enable(dev
);
1326 static int dev_close_many(struct list_head
*head
)
1328 struct net_device
*dev
, *tmp
;
1329 LIST_HEAD(tmp_list
);
1331 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
)
1332 if (!(dev
->flags
& IFF_UP
))
1333 list_move(&dev
->unreg_list
, &tmp_list
);
1335 __dev_close_many(head
);
1337 list_for_each_entry(dev
, head
, unreg_list
) {
1338 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1339 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1342 /* rollback_registered_many needs the complete original list */
1343 list_splice(&tmp_list
, head
);
1348 * dev_close - shutdown an interface.
1349 * @dev: device to shutdown
1351 * This function moves an active device into down state. A
1352 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1353 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1356 int dev_close(struct net_device
*dev
)
1359 if (dev
->flags
& IFF_UP
) {
1362 /* Block netpoll rx while the interface is going down */
1363 ret
= netpoll_rx_disable(dev
);
1367 list_add(&dev
->unreg_list
, &single
);
1368 dev_close_many(&single
);
1371 netpoll_rx_enable(dev
);
1375 EXPORT_SYMBOL(dev_close
);
1379 * dev_disable_lro - disable Large Receive Offload on a device
1382 * Disable Large Receive Offload (LRO) on a net device. Must be
1383 * called under RTNL. This is needed if received packets may be
1384 * forwarded to another interface.
1386 void dev_disable_lro(struct net_device
*dev
)
1389 * If we're trying to disable lro on a vlan device
1390 * use the underlying physical device instead
1392 if (is_vlan_dev(dev
))
1393 dev
= vlan_dev_real_dev(dev
);
1395 dev
->wanted_features
&= ~NETIF_F_LRO
;
1396 netdev_update_features(dev
);
1398 if (unlikely(dev
->features
& NETIF_F_LRO
))
1399 netdev_WARN(dev
, "failed to disable LRO!\n");
1401 EXPORT_SYMBOL(dev_disable_lro
);
1404 static int dev_boot_phase
= 1;
1407 * register_netdevice_notifier - register a network notifier block
1410 * Register a notifier to be called when network device events occur.
1411 * The notifier passed is linked into the kernel structures and must
1412 * not be reused until it has been unregistered. A negative errno code
1413 * is returned on a failure.
1415 * When registered all registration and up events are replayed
1416 * to the new notifier to allow device to have a race free
1417 * view of the network device list.
1420 int register_netdevice_notifier(struct notifier_block
*nb
)
1422 struct net_device
*dev
;
1423 struct net_device
*last
;
1428 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1434 for_each_netdev(net
, dev
) {
1435 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1436 err
= notifier_to_errno(err
);
1440 if (!(dev
->flags
& IFF_UP
))
1443 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1454 for_each_netdev(net
, dev
) {
1458 if (dev
->flags
& IFF_UP
) {
1459 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1460 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1462 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1467 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1470 EXPORT_SYMBOL(register_netdevice_notifier
);
1473 * unregister_netdevice_notifier - unregister a network notifier block
1476 * Unregister a notifier previously registered by
1477 * register_netdevice_notifier(). The notifier is unlinked into the
1478 * kernel structures and may then be reused. A negative errno code
1479 * is returned on a failure.
1481 * After unregistering unregister and down device events are synthesized
1482 * for all devices on the device list to the removed notifier to remove
1483 * the need for special case cleanup code.
1486 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1488 struct net_device
*dev
;
1493 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1498 for_each_netdev(net
, dev
) {
1499 if (dev
->flags
& IFF_UP
) {
1500 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1501 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1503 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1510 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1513 * call_netdevice_notifiers - call all network notifier blocks
1514 * @val: value passed unmodified to notifier function
1515 * @dev: net_device pointer passed unmodified to notifier function
1517 * Call all network notifier blocks. Parameters and return value
1518 * are as for raw_notifier_call_chain().
1521 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1524 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1526 EXPORT_SYMBOL(call_netdevice_notifiers
);
1528 static struct static_key netstamp_needed __read_mostly
;
1529 #ifdef HAVE_JUMP_LABEL
1530 /* We are not allowed to call static_key_slow_dec() from irq context
1531 * If net_disable_timestamp() is called from irq context, defer the
1532 * static_key_slow_dec() calls.
1534 static atomic_t netstamp_needed_deferred
;
1537 void net_enable_timestamp(void)
1539 #ifdef HAVE_JUMP_LABEL
1540 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1544 static_key_slow_dec(&netstamp_needed
);
1548 static_key_slow_inc(&netstamp_needed
);
1550 EXPORT_SYMBOL(net_enable_timestamp
);
1552 void net_disable_timestamp(void)
1554 #ifdef HAVE_JUMP_LABEL
1555 if (in_interrupt()) {
1556 atomic_inc(&netstamp_needed_deferred
);
1560 static_key_slow_dec(&netstamp_needed
);
1562 EXPORT_SYMBOL(net_disable_timestamp
);
1564 static inline void net_timestamp_set(struct sk_buff
*skb
)
1566 skb
->tstamp
.tv64
= 0;
1567 if (static_key_false(&netstamp_needed
))
1568 __net_timestamp(skb
);
1571 #define net_timestamp_check(COND, SKB) \
1572 if (static_key_false(&netstamp_needed)) { \
1573 if ((COND) && !(SKB)->tstamp.tv64) \
1574 __net_timestamp(SKB); \
1577 static inline bool is_skb_forwardable(struct net_device *dev,
1578 struct sk_buff
*skb
)
1582 if (!(dev
->flags
& IFF_UP
))
1585 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1586 if (skb
->len
<= len
)
1589 /* if TSO is enabled, we don't care about the length as the packet
1590 * could be forwarded without being segmented before
1592 if (skb_is_gso(skb
))
1599 * dev_forward_skb - loopback an skb to another netif
1601 * @dev: destination network device
1602 * @skb: buffer to forward
1605 * NET_RX_SUCCESS (no congestion)
1606 * NET_RX_DROP (packet was dropped, but freed)
1608 * dev_forward_skb can be used for injecting an skb from the
1609 * start_xmit function of one device into the receive queue
1610 * of another device.
1612 * The receiving device may be in another namespace, so
1613 * we have to clear all information in the skb that could
1614 * impact namespace isolation.
1616 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1618 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1619 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1620 atomic_long_inc(&dev
->rx_dropped
);
1628 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1629 atomic_long_inc(&dev
->rx_dropped
);
1636 skb
->tstamp
.tv64
= 0;
1637 skb
->pkt_type
= PACKET_HOST
;
1638 skb
->protocol
= eth_type_trans(skb
, dev
);
1642 nf_reset_trace(skb
);
1643 return netif_rx(skb
);
1645 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1647 static inline int deliver_skb(struct sk_buff
*skb
,
1648 struct packet_type
*pt_prev
,
1649 struct net_device
*orig_dev
)
1651 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1653 atomic_inc(&skb
->users
);
1654 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1657 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1659 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1662 if (ptype
->id_match
)
1663 return ptype
->id_match(ptype
, skb
->sk
);
1664 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1671 * Support routine. Sends outgoing frames to any network
1672 * taps currently in use.
1675 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1677 struct packet_type
*ptype
;
1678 struct sk_buff
*skb2
= NULL
;
1679 struct packet_type
*pt_prev
= NULL
;
1682 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1683 /* Never send packets back to the socket
1684 * they originated from - MvS (miquels@drinkel.ow.org)
1686 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1687 (!skb_loop_sk(ptype
, skb
))) {
1689 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1694 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1698 net_timestamp_set(skb2
);
1700 /* skb->nh should be correctly
1701 set by sender, so that the second statement is
1702 just protection against buggy protocols.
1704 skb_reset_mac_header(skb2
);
1706 if (skb_network_header(skb2
) < skb2
->data
||
1707 skb2
->network_header
> skb2
->tail
) {
1708 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1709 ntohs(skb2
->protocol
),
1711 skb_reset_network_header(skb2
);
1714 skb2
->transport_header
= skb2
->network_header
;
1715 skb2
->pkt_type
= PACKET_OUTGOING
;
1720 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1725 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1726 * @dev: Network device
1727 * @txq: number of queues available
1729 * If real_num_tx_queues is changed the tc mappings may no longer be
1730 * valid. To resolve this verify the tc mapping remains valid and if
1731 * not NULL the mapping. With no priorities mapping to this
1732 * offset/count pair it will no longer be used. In the worst case TC0
1733 * is invalid nothing can be done so disable priority mappings. If is
1734 * expected that drivers will fix this mapping if they can before
1735 * calling netif_set_real_num_tx_queues.
1737 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1740 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1742 /* If TC0 is invalidated disable TC mapping */
1743 if (tc
->offset
+ tc
->count
> txq
) {
1744 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1749 /* Invalidated prio to tc mappings set to TC0 */
1750 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1751 int q
= netdev_get_prio_tc_map(dev
, i
);
1753 tc
= &dev
->tc_to_txq
[q
];
1754 if (tc
->offset
+ tc
->count
> txq
) {
1755 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1757 netdev_set_prio_tc_map(dev
, i
, 0);
1763 static DEFINE_MUTEX(xps_map_mutex
);
1764 #define xmap_dereference(P) \
1765 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1767 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1770 struct xps_map
*map
= NULL
;
1774 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1776 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1777 if (map
->queues
[pos
] == index
) {
1779 map
->queues
[pos
] = map
->queues
[--map
->len
];
1781 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1782 kfree_rcu(map
, rcu
);
1792 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1794 struct xps_dev_maps
*dev_maps
;
1796 bool active
= false;
1798 mutex_lock(&xps_map_mutex
);
1799 dev_maps
= xmap_dereference(dev
->xps_maps
);
1804 for_each_possible_cpu(cpu
) {
1805 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1806 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1809 if (i
== dev
->num_tx_queues
)
1814 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1815 kfree_rcu(dev_maps
, rcu
);
1818 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1819 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1823 mutex_unlock(&xps_map_mutex
);
1826 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1829 struct xps_map
*new_map
;
1830 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1833 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1834 if (map
->queues
[pos
] != index
)
1839 /* Need to add queue to this CPU's existing map */
1841 if (pos
< map
->alloc_len
)
1844 alloc_len
= map
->alloc_len
* 2;
1847 /* Need to allocate new map to store queue on this CPU's map */
1848 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1853 for (i
= 0; i
< pos
; i
++)
1854 new_map
->queues
[i
] = map
->queues
[i
];
1855 new_map
->alloc_len
= alloc_len
;
1861 int netif_set_xps_queue(struct net_device
*dev
, struct cpumask
*mask
, u16 index
)
1863 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1864 struct xps_map
*map
, *new_map
;
1865 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1866 int cpu
, numa_node_id
= -2;
1867 bool active
= false;
1869 mutex_lock(&xps_map_mutex
);
1871 dev_maps
= xmap_dereference(dev
->xps_maps
);
1873 /* allocate memory for queue storage */
1874 for_each_online_cpu(cpu
) {
1875 if (!cpumask_test_cpu(cpu
, mask
))
1879 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
1880 if (!new_dev_maps
) {
1881 mutex_unlock(&xps_map_mutex
);
1885 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1888 map
= expand_xps_map(map
, cpu
, index
);
1892 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1896 goto out_no_new_maps
;
1898 for_each_possible_cpu(cpu
) {
1899 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
1900 /* add queue to CPU maps */
1903 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1904 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
1907 if (pos
== map
->len
)
1908 map
->queues
[map
->len
++] = index
;
1910 if (numa_node_id
== -2)
1911 numa_node_id
= cpu_to_node(cpu
);
1912 else if (numa_node_id
!= cpu_to_node(cpu
))
1915 } else if (dev_maps
) {
1916 /* fill in the new device map from the old device map */
1917 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1918 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1923 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
1925 /* Cleanup old maps */
1927 for_each_possible_cpu(cpu
) {
1928 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1929 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1930 if (map
&& map
!= new_map
)
1931 kfree_rcu(map
, rcu
);
1934 kfree_rcu(dev_maps
, rcu
);
1937 dev_maps
= new_dev_maps
;
1941 /* update Tx queue numa node */
1942 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
1943 (numa_node_id
>= 0) ? numa_node_id
:
1949 /* removes queue from unused CPUs */
1950 for_each_possible_cpu(cpu
) {
1951 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
1954 if (remove_xps_queue(dev_maps
, cpu
, index
))
1958 /* free map if not active */
1960 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1961 kfree_rcu(dev_maps
, rcu
);
1965 mutex_unlock(&xps_map_mutex
);
1969 /* remove any maps that we added */
1970 for_each_possible_cpu(cpu
) {
1971 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1972 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1974 if (new_map
&& new_map
!= map
)
1978 mutex_unlock(&xps_map_mutex
);
1980 kfree(new_dev_maps
);
1983 EXPORT_SYMBOL(netif_set_xps_queue
);
1987 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1988 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1990 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
1994 if (txq
< 1 || txq
> dev
->num_tx_queues
)
1997 if (dev
->reg_state
== NETREG_REGISTERED
||
1998 dev
->reg_state
== NETREG_UNREGISTERING
) {
2001 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2007 netif_setup_tc(dev
, txq
);
2009 if (txq
< dev
->real_num_tx_queues
) {
2010 qdisc_reset_all_tx_gt(dev
, txq
);
2012 netif_reset_xps_queues_gt(dev
, txq
);
2017 dev
->real_num_tx_queues
= txq
;
2020 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2024 * netif_set_real_num_rx_queues - set actual number of RX queues used
2025 * @dev: Network device
2026 * @rxq: Actual number of RX queues
2028 * This must be called either with the rtnl_lock held or before
2029 * registration of the net device. Returns 0 on success, or a
2030 * negative error code. If called before registration, it always
2033 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2037 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2040 if (dev
->reg_state
== NETREG_REGISTERED
) {
2043 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2049 dev
->real_num_rx_queues
= rxq
;
2052 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2056 * netif_get_num_default_rss_queues - default number of RSS queues
2058 * This routine should set an upper limit on the number of RSS queues
2059 * used by default by multiqueue devices.
2061 int netif_get_num_default_rss_queues(void)
2063 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2065 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2067 static inline void __netif_reschedule(struct Qdisc
*q
)
2069 struct softnet_data
*sd
;
2070 unsigned long flags
;
2072 local_irq_save(flags
);
2073 sd
= &__get_cpu_var(softnet_data
);
2074 q
->next_sched
= NULL
;
2075 *sd
->output_queue_tailp
= q
;
2076 sd
->output_queue_tailp
= &q
->next_sched
;
2077 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2078 local_irq_restore(flags
);
2081 void __netif_schedule(struct Qdisc
*q
)
2083 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2084 __netif_reschedule(q
);
2086 EXPORT_SYMBOL(__netif_schedule
);
2088 void dev_kfree_skb_irq(struct sk_buff
*skb
)
2090 if (atomic_dec_and_test(&skb
->users
)) {
2091 struct softnet_data
*sd
;
2092 unsigned long flags
;
2094 local_irq_save(flags
);
2095 sd
= &__get_cpu_var(softnet_data
);
2096 skb
->next
= sd
->completion_queue
;
2097 sd
->completion_queue
= skb
;
2098 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2099 local_irq_restore(flags
);
2102 EXPORT_SYMBOL(dev_kfree_skb_irq
);
2104 void dev_kfree_skb_any(struct sk_buff
*skb
)
2106 if (in_irq() || irqs_disabled())
2107 dev_kfree_skb_irq(skb
);
2111 EXPORT_SYMBOL(dev_kfree_skb_any
);
2115 * netif_device_detach - mark device as removed
2116 * @dev: network device
2118 * Mark device as removed from system and therefore no longer available.
2120 void netif_device_detach(struct net_device
*dev
)
2122 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2123 netif_running(dev
)) {
2124 netif_tx_stop_all_queues(dev
);
2127 EXPORT_SYMBOL(netif_device_detach
);
2130 * netif_device_attach - mark device as attached
2131 * @dev: network device
2133 * Mark device as attached from system and restart if needed.
2135 void netif_device_attach(struct net_device
*dev
)
2137 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2138 netif_running(dev
)) {
2139 netif_tx_wake_all_queues(dev
);
2140 __netdev_watchdog_up(dev
);
2143 EXPORT_SYMBOL(netif_device_attach
);
2145 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2147 static const netdev_features_t null_features
= 0;
2148 struct net_device
*dev
= skb
->dev
;
2149 const char *driver
= "";
2151 if (dev
&& dev
->dev
.parent
)
2152 driver
= dev_driver_string(dev
->dev
.parent
);
2154 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2155 "gso_type=%d ip_summed=%d\n",
2156 driver
, dev
? &dev
->features
: &null_features
,
2157 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2158 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2159 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2163 * Invalidate hardware checksum when packet is to be mangled, and
2164 * complete checksum manually on outgoing path.
2166 int skb_checksum_help(struct sk_buff
*skb
)
2169 int ret
= 0, offset
;
2171 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2172 goto out_set_summed
;
2174 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2175 skb_warn_bad_offload(skb
);
2179 /* Before computing a checksum, we should make sure no frag could
2180 * be modified by an external entity : checksum could be wrong.
2182 if (skb_has_shared_frag(skb
)) {
2183 ret
= __skb_linearize(skb
);
2188 offset
= skb_checksum_start_offset(skb
);
2189 BUG_ON(offset
>= skb_headlen(skb
));
2190 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2192 offset
+= skb
->csum_offset
;
2193 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2195 if (skb_cloned(skb
) &&
2196 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2197 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2202 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2204 skb
->ip_summed
= CHECKSUM_NONE
;
2208 EXPORT_SYMBOL(skb_checksum_help
);
2210 __be16
skb_network_protocol(struct sk_buff
*skb
)
2212 __be16 type
= skb
->protocol
;
2213 int vlan_depth
= ETH_HLEN
;
2215 while (type
== htons(ETH_P_8021Q
)) {
2216 struct vlan_hdr
*vh
;
2218 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
2221 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2222 type
= vh
->h_vlan_encapsulated_proto
;
2223 vlan_depth
+= VLAN_HLEN
;
2230 * skb_mac_gso_segment - mac layer segmentation handler.
2231 * @skb: buffer to segment
2232 * @features: features for the output path (see dev->features)
2234 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2235 netdev_features_t features
)
2237 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2238 struct packet_offload
*ptype
;
2239 __be16 type
= skb_network_protocol(skb
);
2241 if (unlikely(!type
))
2242 return ERR_PTR(-EINVAL
);
2244 __skb_pull(skb
, skb
->mac_len
);
2247 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2248 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2249 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2252 err
= ptype
->callbacks
.gso_send_check(skb
);
2253 segs
= ERR_PTR(err
);
2254 if (err
|| skb_gso_ok(skb
, features
))
2256 __skb_push(skb
, (skb
->data
-
2257 skb_network_header(skb
)));
2259 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2265 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2269 EXPORT_SYMBOL(skb_mac_gso_segment
);
2272 /* openvswitch calls this on rx path, so we need a different check.
2274 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2277 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2279 return skb
->ip_summed
== CHECKSUM_NONE
;
2283 * __skb_gso_segment - Perform segmentation on skb.
2284 * @skb: buffer to segment
2285 * @features: features for the output path (see dev->features)
2286 * @tx_path: whether it is called in TX path
2288 * This function segments the given skb and returns a list of segments.
2290 * It may return NULL if the skb requires no segmentation. This is
2291 * only possible when GSO is used for verifying header integrity.
2293 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2294 netdev_features_t features
, bool tx_path
)
2296 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2299 skb_warn_bad_offload(skb
);
2301 if (skb_header_cloned(skb
) &&
2302 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2303 return ERR_PTR(err
);
2306 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2307 skb_reset_mac_header(skb
);
2308 skb_reset_mac_len(skb
);
2310 return skb_mac_gso_segment(skb
, features
);
2312 EXPORT_SYMBOL(__skb_gso_segment
);
2314 /* Take action when hardware reception checksum errors are detected. */
2316 void netdev_rx_csum_fault(struct net_device
*dev
)
2318 if (net_ratelimit()) {
2319 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2323 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2326 /* Actually, we should eliminate this check as soon as we know, that:
2327 * 1. IOMMU is present and allows to map all the memory.
2328 * 2. No high memory really exists on this machine.
2331 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2333 #ifdef CONFIG_HIGHMEM
2335 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2336 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2337 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2338 if (PageHighMem(skb_frag_page(frag
)))
2343 if (PCI_DMA_BUS_IS_PHYS
) {
2344 struct device
*pdev
= dev
->dev
.parent
;
2348 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2349 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2350 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2351 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2360 void (*destructor
)(struct sk_buff
*skb
);
2363 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2365 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2367 struct dev_gso_cb
*cb
;
2370 struct sk_buff
*nskb
= skb
->next
;
2372 skb
->next
= nskb
->next
;
2375 } while (skb
->next
);
2377 cb
= DEV_GSO_CB(skb
);
2379 cb
->destructor(skb
);
2383 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2384 * @skb: buffer to segment
2385 * @features: device features as applicable to this skb
2387 * This function segments the given skb and stores the list of segments
2390 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2392 struct sk_buff
*segs
;
2394 segs
= skb_gso_segment(skb
, features
);
2396 /* Verifying header integrity only. */
2401 return PTR_ERR(segs
);
2404 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2405 skb
->destructor
= dev_gso_skb_destructor
;
2410 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2411 __be16 protocol
, netdev_features_t features
)
2413 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2414 !can_checksum_protocol(features
, protocol
)) {
2415 features
&= ~NETIF_F_ALL_CSUM
;
2416 } else if (illegal_highdma(skb
->dev
, skb
)) {
2417 features
&= ~NETIF_F_SG
;
2423 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2425 __be16 protocol
= skb
->protocol
;
2426 netdev_features_t features
= skb
->dev
->features
;
2428 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2429 features
&= ~NETIF_F_GSO_MASK
;
2431 if (protocol
== htons(ETH_P_8021Q
)) {
2432 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2433 protocol
= veh
->h_vlan_encapsulated_proto
;
2434 } else if (!vlan_tx_tag_present(skb
)) {
2435 return harmonize_features(skb
, protocol
, features
);
2438 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_CTAG_TX
);
2440 if (protocol
!= htons(ETH_P_8021Q
)) {
2441 return harmonize_features(skb
, protocol
, features
);
2443 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2444 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_CTAG_TX
;
2445 return harmonize_features(skb
, protocol
, features
);
2448 EXPORT_SYMBOL(netif_skb_features
);
2451 * Returns true if either:
2452 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2453 * 2. skb is fragmented and the device does not support SG.
2455 static inline int skb_needs_linearize(struct sk_buff
*skb
,
2458 return skb_is_nonlinear(skb
) &&
2459 ((skb_has_frag_list(skb
) &&
2460 !(features
& NETIF_F_FRAGLIST
)) ||
2461 (skb_shinfo(skb
)->nr_frags
&&
2462 !(features
& NETIF_F_SG
)));
2465 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2466 struct netdev_queue
*txq
)
2468 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2469 int rc
= NETDEV_TX_OK
;
2470 unsigned int skb_len
;
2472 if (likely(!skb
->next
)) {
2473 netdev_features_t features
;
2476 * If device doesn't need skb->dst, release it right now while
2477 * its hot in this cpu cache
2479 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2482 features
= netif_skb_features(skb
);
2484 if (vlan_tx_tag_present(skb
) &&
2485 !(features
& NETIF_F_HW_VLAN_CTAG_TX
)) {
2486 skb
= __vlan_put_tag(skb
, vlan_tx_tag_get(skb
));
2493 /* If encapsulation offload request, verify we are testing
2494 * hardware encapsulation features instead of standard
2495 * features for the netdev
2497 if (skb
->encapsulation
)
2498 features
&= dev
->hw_enc_features
;
2500 if (netif_needs_gso(skb
, features
)) {
2501 if (unlikely(dev_gso_segment(skb
, features
)))
2506 if (skb_needs_linearize(skb
, features
) &&
2507 __skb_linearize(skb
))
2510 /* If packet is not checksummed and device does not
2511 * support checksumming for this protocol, complete
2512 * checksumming here.
2514 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2515 if (skb
->encapsulation
)
2516 skb_set_inner_transport_header(skb
,
2517 skb_checksum_start_offset(skb
));
2519 skb_set_transport_header(skb
,
2520 skb_checksum_start_offset(skb
));
2521 if (!(features
& NETIF_F_ALL_CSUM
) &&
2522 skb_checksum_help(skb
))
2527 if (!list_empty(&ptype_all
))
2528 dev_queue_xmit_nit(skb
, dev
);
2531 rc
= ops
->ndo_start_xmit(skb
, dev
);
2532 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2533 if (rc
== NETDEV_TX_OK
)
2534 txq_trans_update(txq
);
2540 struct sk_buff
*nskb
= skb
->next
;
2542 skb
->next
= nskb
->next
;
2546 * If device doesn't need nskb->dst, release it right now while
2547 * its hot in this cpu cache
2549 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2552 if (!list_empty(&ptype_all
))
2553 dev_queue_xmit_nit(nskb
, dev
);
2555 skb_len
= nskb
->len
;
2556 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2557 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2558 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2559 if (rc
& ~NETDEV_TX_MASK
)
2560 goto out_kfree_gso_skb
;
2561 nskb
->next
= skb
->next
;
2565 txq_trans_update(txq
);
2566 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2567 return NETDEV_TX_BUSY
;
2568 } while (skb
->next
);
2571 if (likely(skb
->next
== NULL
))
2572 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2579 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2581 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2583 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2585 /* To get more precise estimation of bytes sent on wire,
2586 * we add to pkt_len the headers size of all segments
2588 if (shinfo
->gso_size
) {
2589 unsigned int hdr_len
;
2590 u16 gso_segs
= shinfo
->gso_segs
;
2592 /* mac layer + network layer */
2593 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2595 /* + transport layer */
2596 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2597 hdr_len
+= tcp_hdrlen(skb
);
2599 hdr_len
+= sizeof(struct udphdr
);
2601 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2602 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2605 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2609 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2610 struct net_device
*dev
,
2611 struct netdev_queue
*txq
)
2613 spinlock_t
*root_lock
= qdisc_lock(q
);
2617 qdisc_pkt_len_init(skb
);
2618 qdisc_calculate_pkt_len(skb
, q
);
2620 * Heuristic to force contended enqueues to serialize on a
2621 * separate lock before trying to get qdisc main lock.
2622 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2623 * and dequeue packets faster.
2625 contended
= qdisc_is_running(q
);
2626 if (unlikely(contended
))
2627 spin_lock(&q
->busylock
);
2629 spin_lock(root_lock
);
2630 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2633 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2634 qdisc_run_begin(q
)) {
2636 * This is a work-conserving queue; there are no old skbs
2637 * waiting to be sent out; and the qdisc is not running -
2638 * xmit the skb directly.
2640 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2643 qdisc_bstats_update(q
, skb
);
2645 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2646 if (unlikely(contended
)) {
2647 spin_unlock(&q
->busylock
);
2654 rc
= NET_XMIT_SUCCESS
;
2657 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2658 if (qdisc_run_begin(q
)) {
2659 if (unlikely(contended
)) {
2660 spin_unlock(&q
->busylock
);
2666 spin_unlock(root_lock
);
2667 if (unlikely(contended
))
2668 spin_unlock(&q
->busylock
);
2672 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2673 static void skb_update_prio(struct sk_buff
*skb
)
2675 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2677 if (!skb
->priority
&& skb
->sk
&& map
) {
2678 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2680 if (prioidx
< map
->priomap_len
)
2681 skb
->priority
= map
->priomap
[prioidx
];
2685 #define skb_update_prio(skb)
2688 static DEFINE_PER_CPU(int, xmit_recursion
);
2689 #define RECURSION_LIMIT 10
2692 * dev_loopback_xmit - loop back @skb
2693 * @skb: buffer to transmit
2695 int dev_loopback_xmit(struct sk_buff
*skb
)
2697 skb_reset_mac_header(skb
);
2698 __skb_pull(skb
, skb_network_offset(skb
));
2699 skb
->pkt_type
= PACKET_LOOPBACK
;
2700 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2701 WARN_ON(!skb_dst(skb
));
2706 EXPORT_SYMBOL(dev_loopback_xmit
);
2709 * dev_queue_xmit - transmit a buffer
2710 * @skb: buffer to transmit
2712 * Queue a buffer for transmission to a network device. The caller must
2713 * have set the device and priority and built the buffer before calling
2714 * this function. The function can be called from an interrupt.
2716 * A negative errno code is returned on a failure. A success does not
2717 * guarantee the frame will be transmitted as it may be dropped due
2718 * to congestion or traffic shaping.
2720 * -----------------------------------------------------------------------------------
2721 * I notice this method can also return errors from the queue disciplines,
2722 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2725 * Regardless of the return value, the skb is consumed, so it is currently
2726 * difficult to retry a send to this method. (You can bump the ref count
2727 * before sending to hold a reference for retry if you are careful.)
2729 * When calling this method, interrupts MUST be enabled. This is because
2730 * the BH enable code must have IRQs enabled so that it will not deadlock.
2733 int dev_queue_xmit(struct sk_buff
*skb
)
2735 struct net_device
*dev
= skb
->dev
;
2736 struct netdev_queue
*txq
;
2740 skb_reset_mac_header(skb
);
2742 /* Disable soft irqs for various locks below. Also
2743 * stops preemption for RCU.
2747 skb_update_prio(skb
);
2749 txq
= netdev_pick_tx(dev
, skb
);
2750 q
= rcu_dereference_bh(txq
->qdisc
);
2752 #ifdef CONFIG_NET_CLS_ACT
2753 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2755 trace_net_dev_queue(skb
);
2757 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2761 /* The device has no queue. Common case for software devices:
2762 loopback, all the sorts of tunnels...
2764 Really, it is unlikely that netif_tx_lock protection is necessary
2765 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2767 However, it is possible, that they rely on protection
2770 Check this and shot the lock. It is not prone from deadlocks.
2771 Either shot noqueue qdisc, it is even simpler 8)
2773 if (dev
->flags
& IFF_UP
) {
2774 int cpu
= smp_processor_id(); /* ok because BHs are off */
2776 if (txq
->xmit_lock_owner
!= cpu
) {
2778 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2779 goto recursion_alert
;
2781 HARD_TX_LOCK(dev
, txq
, cpu
);
2783 if (!netif_xmit_stopped(txq
)) {
2784 __this_cpu_inc(xmit_recursion
);
2785 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2786 __this_cpu_dec(xmit_recursion
);
2787 if (dev_xmit_complete(rc
)) {
2788 HARD_TX_UNLOCK(dev
, txq
);
2792 HARD_TX_UNLOCK(dev
, txq
);
2793 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2796 /* Recursion is detected! It is possible,
2800 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2806 rcu_read_unlock_bh();
2811 rcu_read_unlock_bh();
2814 EXPORT_SYMBOL(dev_queue_xmit
);
2817 /*=======================================================================
2819 =======================================================================*/
2821 int netdev_max_backlog __read_mostly
= 1000;
2822 EXPORT_SYMBOL(netdev_max_backlog
);
2824 int netdev_tstamp_prequeue __read_mostly
= 1;
2825 int netdev_budget __read_mostly
= 300;
2826 int weight_p __read_mostly
= 64; /* old backlog weight */
2828 /* Called with irq disabled */
2829 static inline void ____napi_schedule(struct softnet_data
*sd
,
2830 struct napi_struct
*napi
)
2832 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2833 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2838 /* One global table that all flow-based protocols share. */
2839 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2840 EXPORT_SYMBOL(rps_sock_flow_table
);
2842 struct static_key rps_needed __read_mostly
;
2844 static struct rps_dev_flow
*
2845 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2846 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2848 if (next_cpu
!= RPS_NO_CPU
) {
2849 #ifdef CONFIG_RFS_ACCEL
2850 struct netdev_rx_queue
*rxqueue
;
2851 struct rps_dev_flow_table
*flow_table
;
2852 struct rps_dev_flow
*old_rflow
;
2857 /* Should we steer this flow to a different hardware queue? */
2858 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2859 !(dev
->features
& NETIF_F_NTUPLE
))
2861 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2862 if (rxq_index
== skb_get_rx_queue(skb
))
2865 rxqueue
= dev
->_rx
+ rxq_index
;
2866 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2869 flow_id
= skb
->rxhash
& flow_table
->mask
;
2870 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2871 rxq_index
, flow_id
);
2875 rflow
= &flow_table
->flows
[flow_id
];
2877 if (old_rflow
->filter
== rflow
->filter
)
2878 old_rflow
->filter
= RPS_NO_FILTER
;
2882 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2885 rflow
->cpu
= next_cpu
;
2890 * get_rps_cpu is called from netif_receive_skb and returns the target
2891 * CPU from the RPS map of the receiving queue for a given skb.
2892 * rcu_read_lock must be held on entry.
2894 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2895 struct rps_dev_flow
**rflowp
)
2897 struct netdev_rx_queue
*rxqueue
;
2898 struct rps_map
*map
;
2899 struct rps_dev_flow_table
*flow_table
;
2900 struct rps_sock_flow_table
*sock_flow_table
;
2904 if (skb_rx_queue_recorded(skb
)) {
2905 u16 index
= skb_get_rx_queue(skb
);
2906 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2907 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2908 "%s received packet on queue %u, but number "
2909 "of RX queues is %u\n",
2910 dev
->name
, index
, dev
->real_num_rx_queues
);
2913 rxqueue
= dev
->_rx
+ index
;
2917 map
= rcu_dereference(rxqueue
->rps_map
);
2919 if (map
->len
== 1 &&
2920 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2921 tcpu
= map
->cpus
[0];
2922 if (cpu_online(tcpu
))
2926 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2930 skb_reset_network_header(skb
);
2931 if (!skb_get_rxhash(skb
))
2934 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2935 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
2936 if (flow_table
&& sock_flow_table
) {
2938 struct rps_dev_flow
*rflow
;
2940 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
2943 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
2944 sock_flow_table
->mask
];
2947 * If the desired CPU (where last recvmsg was done) is
2948 * different from current CPU (one in the rx-queue flow
2949 * table entry), switch if one of the following holds:
2950 * - Current CPU is unset (equal to RPS_NO_CPU).
2951 * - Current CPU is offline.
2952 * - The current CPU's queue tail has advanced beyond the
2953 * last packet that was enqueued using this table entry.
2954 * This guarantees that all previous packets for the flow
2955 * have been dequeued, thus preserving in order delivery.
2957 if (unlikely(tcpu
!= next_cpu
) &&
2958 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
2959 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
2960 rflow
->last_qtail
)) >= 0)) {
2962 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
2965 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
2973 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
2975 if (cpu_online(tcpu
)) {
2985 #ifdef CONFIG_RFS_ACCEL
2988 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2989 * @dev: Device on which the filter was set
2990 * @rxq_index: RX queue index
2991 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2992 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2994 * Drivers that implement ndo_rx_flow_steer() should periodically call
2995 * this function for each installed filter and remove the filters for
2996 * which it returns %true.
2998 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
2999 u32 flow_id
, u16 filter_id
)
3001 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3002 struct rps_dev_flow_table
*flow_table
;
3003 struct rps_dev_flow
*rflow
;
3008 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3009 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3010 rflow
= &flow_table
->flows
[flow_id
];
3011 cpu
= ACCESS_ONCE(rflow
->cpu
);
3012 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
3013 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3014 rflow
->last_qtail
) <
3015 (int)(10 * flow_table
->mask
)))
3021 EXPORT_SYMBOL(rps_may_expire_flow
);
3023 #endif /* CONFIG_RFS_ACCEL */
3025 /* Called from hardirq (IPI) context */
3026 static void rps_trigger_softirq(void *data
)
3028 struct softnet_data
*sd
= data
;
3030 ____napi_schedule(sd
, &sd
->backlog
);
3034 #endif /* CONFIG_RPS */
3037 * Check if this softnet_data structure is another cpu one
3038 * If yes, queue it to our IPI list and return 1
3041 static int rps_ipi_queued(struct softnet_data
*sd
)
3044 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
3047 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3048 mysd
->rps_ipi_list
= sd
;
3050 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3053 #endif /* CONFIG_RPS */
3058 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3059 * queue (may be a remote CPU queue).
3061 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3062 unsigned int *qtail
)
3064 struct softnet_data
*sd
;
3065 unsigned long flags
;
3067 sd
= &per_cpu(softnet_data
, cpu
);
3069 local_irq_save(flags
);
3072 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
3073 if (skb_queue_len(&sd
->input_pkt_queue
)) {
3075 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3076 input_queue_tail_incr_save(sd
, qtail
);
3078 local_irq_restore(flags
);
3079 return NET_RX_SUCCESS
;
3082 /* Schedule NAPI for backlog device
3083 * We can use non atomic operation since we own the queue lock
3085 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3086 if (!rps_ipi_queued(sd
))
3087 ____napi_schedule(sd
, &sd
->backlog
);
3095 local_irq_restore(flags
);
3097 atomic_long_inc(&skb
->dev
->rx_dropped
);
3103 * netif_rx - post buffer to the network code
3104 * @skb: buffer to post
3106 * This function receives a packet from a device driver and queues it for
3107 * the upper (protocol) levels to process. It always succeeds. The buffer
3108 * may be dropped during processing for congestion control or by the
3112 * NET_RX_SUCCESS (no congestion)
3113 * NET_RX_DROP (packet was dropped)
3117 int netif_rx(struct sk_buff
*skb
)
3121 /* if netpoll wants it, pretend we never saw it */
3122 if (netpoll_rx(skb
))
3125 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3127 trace_netif_rx(skb
);
3129 if (static_key_false(&rps_needed
)) {
3130 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3136 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3138 cpu
= smp_processor_id();
3140 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3148 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3153 EXPORT_SYMBOL(netif_rx
);
3155 int netif_rx_ni(struct sk_buff
*skb
)
3160 err
= netif_rx(skb
);
3161 if (local_softirq_pending())
3167 EXPORT_SYMBOL(netif_rx_ni
);
3169 static void net_tx_action(struct softirq_action
*h
)
3171 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3173 if (sd
->completion_queue
) {
3174 struct sk_buff
*clist
;
3176 local_irq_disable();
3177 clist
= sd
->completion_queue
;
3178 sd
->completion_queue
= NULL
;
3182 struct sk_buff
*skb
= clist
;
3183 clist
= clist
->next
;
3185 WARN_ON(atomic_read(&skb
->users
));
3186 trace_kfree_skb(skb
, net_tx_action
);
3191 if (sd
->output_queue
) {
3194 local_irq_disable();
3195 head
= sd
->output_queue
;
3196 sd
->output_queue
= NULL
;
3197 sd
->output_queue_tailp
= &sd
->output_queue
;
3201 struct Qdisc
*q
= head
;
3202 spinlock_t
*root_lock
;
3204 head
= head
->next_sched
;
3206 root_lock
= qdisc_lock(q
);
3207 if (spin_trylock(root_lock
)) {
3208 smp_mb__before_clear_bit();
3209 clear_bit(__QDISC_STATE_SCHED
,
3212 spin_unlock(root_lock
);
3214 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3216 __netif_reschedule(q
);
3218 smp_mb__before_clear_bit();
3219 clear_bit(__QDISC_STATE_SCHED
,
3227 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3228 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3229 /* This hook is defined here for ATM LANE */
3230 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3231 unsigned char *addr
) __read_mostly
;
3232 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3235 #ifdef CONFIG_NET_CLS_ACT
3236 /* TODO: Maybe we should just force sch_ingress to be compiled in
3237 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3238 * a compare and 2 stores extra right now if we dont have it on
3239 * but have CONFIG_NET_CLS_ACT
3240 * NOTE: This doesn't stop any functionality; if you dont have
3241 * the ingress scheduler, you just can't add policies on ingress.
3244 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3246 struct net_device
*dev
= skb
->dev
;
3247 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3248 int result
= TC_ACT_OK
;
3251 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3252 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3253 skb
->skb_iif
, dev
->ifindex
);
3257 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3258 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3261 if (q
!= &noop_qdisc
) {
3262 spin_lock(qdisc_lock(q
));
3263 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3264 result
= qdisc_enqueue_root(skb
, q
);
3265 spin_unlock(qdisc_lock(q
));
3271 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3272 struct packet_type
**pt_prev
,
3273 int *ret
, struct net_device
*orig_dev
)
3275 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3277 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3281 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3285 switch (ing_filter(skb
, rxq
)) {
3299 * netdev_rx_handler_register - register receive handler
3300 * @dev: device to register a handler for
3301 * @rx_handler: receive handler to register
3302 * @rx_handler_data: data pointer that is used by rx handler
3304 * Register a receive hander for a device. This handler will then be
3305 * called from __netif_receive_skb. A negative errno code is returned
3308 * The caller must hold the rtnl_mutex.
3310 * For a general description of rx_handler, see enum rx_handler_result.
3312 int netdev_rx_handler_register(struct net_device
*dev
,
3313 rx_handler_func_t
*rx_handler
,
3314 void *rx_handler_data
)
3318 if (dev
->rx_handler
)
3321 /* Note: rx_handler_data must be set before rx_handler */
3322 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3323 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3327 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3330 * netdev_rx_handler_unregister - unregister receive handler
3331 * @dev: device to unregister a handler from
3333 * Unregister a receive handler from a device.
3335 * The caller must hold the rtnl_mutex.
3337 void netdev_rx_handler_unregister(struct net_device
*dev
)
3341 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3342 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3343 * section has a guarantee to see a non NULL rx_handler_data
3347 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3349 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3352 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3353 * the special handling of PFMEMALLOC skbs.
3355 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3357 switch (skb
->protocol
) {
3358 case __constant_htons(ETH_P_ARP
):
3359 case __constant_htons(ETH_P_IP
):
3360 case __constant_htons(ETH_P_IPV6
):
3361 case __constant_htons(ETH_P_8021Q
):
3368 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3370 struct packet_type
*ptype
, *pt_prev
;
3371 rx_handler_func_t
*rx_handler
;
3372 struct net_device
*orig_dev
;
3373 struct net_device
*null_or_dev
;
3374 bool deliver_exact
= false;
3375 int ret
= NET_RX_DROP
;
3378 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3380 trace_netif_receive_skb(skb
);
3382 /* if we've gotten here through NAPI, check netpoll */
3383 if (netpoll_receive_skb(skb
))
3386 orig_dev
= skb
->dev
;
3388 skb_reset_network_header(skb
);
3389 if (!skb_transport_header_was_set(skb
))
3390 skb_reset_transport_header(skb
);
3391 skb_reset_mac_len(skb
);
3398 skb
->skb_iif
= skb
->dev
->ifindex
;
3400 __this_cpu_inc(softnet_data
.processed
);
3402 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
)) {
3403 skb
= vlan_untag(skb
);
3408 #ifdef CONFIG_NET_CLS_ACT
3409 if (skb
->tc_verd
& TC_NCLS
) {
3410 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3418 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3419 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3421 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3427 #ifdef CONFIG_NET_CLS_ACT
3428 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3434 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3437 if (vlan_tx_tag_present(skb
)) {
3439 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3442 if (vlan_do_receive(&skb
))
3444 else if (unlikely(!skb
))
3448 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3451 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3454 switch (rx_handler(&skb
)) {
3455 case RX_HANDLER_CONSUMED
:
3456 ret
= NET_RX_SUCCESS
;
3458 case RX_HANDLER_ANOTHER
:
3460 case RX_HANDLER_EXACT
:
3461 deliver_exact
= true;
3462 case RX_HANDLER_PASS
:
3469 if (vlan_tx_nonzero_tag_present(skb
))
3470 skb
->pkt_type
= PACKET_OTHERHOST
;
3472 /* deliver only exact match when indicated */
3473 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3475 type
= skb
->protocol
;
3476 list_for_each_entry_rcu(ptype
,
3477 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3478 if (ptype
->type
== type
&&
3479 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3480 ptype
->dev
== orig_dev
)) {
3482 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3488 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3491 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3494 atomic_long_inc(&skb
->dev
->rx_dropped
);
3496 /* Jamal, now you will not able to escape explaining
3497 * me how you were going to use this. :-)
3508 static int __netif_receive_skb(struct sk_buff
*skb
)
3512 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3513 unsigned long pflags
= current
->flags
;
3516 * PFMEMALLOC skbs are special, they should
3517 * - be delivered to SOCK_MEMALLOC sockets only
3518 * - stay away from userspace
3519 * - have bounded memory usage
3521 * Use PF_MEMALLOC as this saves us from propagating the allocation
3522 * context down to all allocation sites.
3524 current
->flags
|= PF_MEMALLOC
;
3525 ret
= __netif_receive_skb_core(skb
, true);
3526 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3528 ret
= __netif_receive_skb_core(skb
, false);
3534 * netif_receive_skb - process receive buffer from network
3535 * @skb: buffer to process
3537 * netif_receive_skb() is the main receive data processing function.
3538 * It always succeeds. The buffer may be dropped during processing
3539 * for congestion control or by the protocol layers.
3541 * This function may only be called from softirq context and interrupts
3542 * should be enabled.
3544 * Return values (usually ignored):
3545 * NET_RX_SUCCESS: no congestion
3546 * NET_RX_DROP: packet was dropped
3548 int netif_receive_skb(struct sk_buff
*skb
)
3550 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3552 if (skb_defer_rx_timestamp(skb
))
3553 return NET_RX_SUCCESS
;
3556 if (static_key_false(&rps_needed
)) {
3557 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3562 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3565 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3572 return __netif_receive_skb(skb
);
3574 EXPORT_SYMBOL(netif_receive_skb
);
3576 /* Network device is going away, flush any packets still pending
3577 * Called with irqs disabled.
3579 static void flush_backlog(void *arg
)
3581 struct net_device
*dev
= arg
;
3582 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3583 struct sk_buff
*skb
, *tmp
;
3586 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3587 if (skb
->dev
== dev
) {
3588 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3590 input_queue_head_incr(sd
);
3595 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3596 if (skb
->dev
== dev
) {
3597 __skb_unlink(skb
, &sd
->process_queue
);
3599 input_queue_head_incr(sd
);
3604 static int napi_gro_complete(struct sk_buff
*skb
)
3606 struct packet_offload
*ptype
;
3607 __be16 type
= skb
->protocol
;
3608 struct list_head
*head
= &offload_base
;
3611 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
3613 if (NAPI_GRO_CB(skb
)->count
== 1) {
3614 skb_shinfo(skb
)->gso_size
= 0;
3619 list_for_each_entry_rcu(ptype
, head
, list
) {
3620 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3623 err
= ptype
->callbacks
.gro_complete(skb
);
3629 WARN_ON(&ptype
->list
== head
);
3631 return NET_RX_SUCCESS
;
3635 return netif_receive_skb(skb
);
3638 /* napi->gro_list contains packets ordered by age.
3639 * youngest packets at the head of it.
3640 * Complete skbs in reverse order to reduce latencies.
3642 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3644 struct sk_buff
*skb
, *prev
= NULL
;
3646 /* scan list and build reverse chain */
3647 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3652 for (skb
= prev
; skb
; skb
= prev
) {
3655 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3659 napi_gro_complete(skb
);
3663 napi
->gro_list
= NULL
;
3665 EXPORT_SYMBOL(napi_gro_flush
);
3667 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
3670 unsigned int maclen
= skb
->dev
->hard_header_len
;
3672 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3673 unsigned long diffs
;
3675 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3676 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3677 if (maclen
== ETH_HLEN
)
3678 diffs
|= compare_ether_header(skb_mac_header(p
),
3679 skb_gro_mac_header(skb
));
3681 diffs
= memcmp(skb_mac_header(p
),
3682 skb_gro_mac_header(skb
),
3684 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3685 NAPI_GRO_CB(p
)->flush
= 0;
3689 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3691 struct sk_buff
**pp
= NULL
;
3692 struct packet_offload
*ptype
;
3693 __be16 type
= skb
->protocol
;
3694 struct list_head
*head
= &offload_base
;
3696 enum gro_result ret
;
3698 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3701 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3704 gro_list_prepare(napi
, skb
);
3707 list_for_each_entry_rcu(ptype
, head
, list
) {
3708 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3711 skb_set_network_header(skb
, skb_gro_offset(skb
));
3712 skb_reset_mac_len(skb
);
3713 NAPI_GRO_CB(skb
)->same_flow
= 0;
3714 NAPI_GRO_CB(skb
)->flush
= 0;
3715 NAPI_GRO_CB(skb
)->free
= 0;
3717 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
3722 if (&ptype
->list
== head
)
3725 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3726 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3729 struct sk_buff
*nskb
= *pp
;
3733 napi_gro_complete(nskb
);
3740 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3744 NAPI_GRO_CB(skb
)->count
= 1;
3745 NAPI_GRO_CB(skb
)->age
= jiffies
;
3746 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3747 skb
->next
= napi
->gro_list
;
3748 napi
->gro_list
= skb
;
3752 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3753 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3755 BUG_ON(skb
->end
- skb
->tail
< grow
);
3757 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3760 skb
->data_len
-= grow
;
3762 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3763 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3765 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3766 skb_frag_unref(skb
, 0);
3767 memmove(skb_shinfo(skb
)->frags
,
3768 skb_shinfo(skb
)->frags
+ 1,
3769 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3782 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3786 if (netif_receive_skb(skb
))
3794 case GRO_MERGED_FREE
:
3795 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3796 kmem_cache_free(skbuff_head_cache
, skb
);
3809 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3811 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3812 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3814 NAPI_GRO_CB(skb
)->data_offset
= 0;
3815 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3816 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3818 if (skb
->mac_header
== skb
->tail
&&
3820 !PageHighMem(skb_frag_page(frag0
))) {
3821 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3822 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3826 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3828 skb_gro_reset_offset(skb
);
3830 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
3832 EXPORT_SYMBOL(napi_gro_receive
);
3834 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3836 __skb_pull(skb
, skb_headlen(skb
));
3837 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3838 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3840 skb
->dev
= napi
->dev
;
3846 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3848 struct sk_buff
*skb
= napi
->skb
;
3851 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3857 EXPORT_SYMBOL(napi_get_frags
);
3859 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3865 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3867 if (ret
== GRO_HELD
)
3868 skb_gro_pull(skb
, -ETH_HLEN
);
3869 else if (netif_receive_skb(skb
))
3874 case GRO_MERGED_FREE
:
3875 napi_reuse_skb(napi
, skb
);
3885 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3887 struct sk_buff
*skb
= napi
->skb
;
3894 skb_reset_mac_header(skb
);
3895 skb_gro_reset_offset(skb
);
3897 off
= skb_gro_offset(skb
);
3898 hlen
= off
+ sizeof(*eth
);
3899 eth
= skb_gro_header_fast(skb
, off
);
3900 if (skb_gro_header_hard(skb
, hlen
)) {
3901 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3902 if (unlikely(!eth
)) {
3903 napi_reuse_skb(napi
, skb
);
3909 skb_gro_pull(skb
, sizeof(*eth
));
3912 * This works because the only protocols we care about don't require
3913 * special handling. We'll fix it up properly at the end.
3915 skb
->protocol
= eth
->h_proto
;
3921 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
3923 struct sk_buff
*skb
= napi_frags_skb(napi
);
3928 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
3930 EXPORT_SYMBOL(napi_gro_frags
);
3933 * net_rps_action sends any pending IPI's for rps.
3934 * Note: called with local irq disabled, but exits with local irq enabled.
3936 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
3939 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
3942 sd
->rps_ipi_list
= NULL
;
3946 /* Send pending IPI's to kick RPS processing on remote cpus. */
3948 struct softnet_data
*next
= remsd
->rps_ipi_next
;
3950 if (cpu_online(remsd
->cpu
))
3951 __smp_call_function_single(remsd
->cpu
,
3960 static int process_backlog(struct napi_struct
*napi
, int quota
)
3963 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
3966 /* Check if we have pending ipi, its better to send them now,
3967 * not waiting net_rx_action() end.
3969 if (sd
->rps_ipi_list
) {
3970 local_irq_disable();
3971 net_rps_action_and_irq_enable(sd
);
3974 napi
->weight
= weight_p
;
3975 local_irq_disable();
3976 while (work
< quota
) {
3977 struct sk_buff
*skb
;
3980 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
3982 __netif_receive_skb(skb
);
3983 local_irq_disable();
3984 input_queue_head_incr(sd
);
3985 if (++work
>= quota
) {
3992 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3994 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
3995 &sd
->process_queue
);
3997 if (qlen
< quota
- work
) {
3999 * Inline a custom version of __napi_complete().
4000 * only current cpu owns and manipulates this napi,
4001 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
4002 * we can use a plain write instead of clear_bit(),
4003 * and we dont need an smp_mb() memory barrier.
4005 list_del(&napi
->poll_list
);
4008 quota
= work
+ qlen
;
4018 * __napi_schedule - schedule for receive
4019 * @n: entry to schedule
4021 * The entry's receive function will be scheduled to run
4023 void __napi_schedule(struct napi_struct
*n
)
4025 unsigned long flags
;
4027 local_irq_save(flags
);
4028 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
4029 local_irq_restore(flags
);
4031 EXPORT_SYMBOL(__napi_schedule
);
4033 void __napi_complete(struct napi_struct
*n
)
4035 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4036 BUG_ON(n
->gro_list
);
4038 list_del(&n
->poll_list
);
4039 smp_mb__before_clear_bit();
4040 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4042 EXPORT_SYMBOL(__napi_complete
);
4044 void napi_complete(struct napi_struct
*n
)
4046 unsigned long flags
;
4049 * don't let napi dequeue from the cpu poll list
4050 * just in case its running on a different cpu
4052 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4055 napi_gro_flush(n
, false);
4056 local_irq_save(flags
);
4058 local_irq_restore(flags
);
4060 EXPORT_SYMBOL(napi_complete
);
4062 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4063 int (*poll
)(struct napi_struct
*, int), int weight
)
4065 INIT_LIST_HEAD(&napi
->poll_list
);
4066 napi
->gro_count
= 0;
4067 napi
->gro_list
= NULL
;
4070 if (weight
> NAPI_POLL_WEIGHT
)
4071 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4073 napi
->weight
= weight
;
4074 list_add(&napi
->dev_list
, &dev
->napi_list
);
4076 #ifdef CONFIG_NETPOLL
4077 spin_lock_init(&napi
->poll_lock
);
4078 napi
->poll_owner
= -1;
4080 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4082 EXPORT_SYMBOL(netif_napi_add
);
4084 void netif_napi_del(struct napi_struct
*napi
)
4086 struct sk_buff
*skb
, *next
;
4088 list_del_init(&napi
->dev_list
);
4089 napi_free_frags(napi
);
4091 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
4097 napi
->gro_list
= NULL
;
4098 napi
->gro_count
= 0;
4100 EXPORT_SYMBOL(netif_napi_del
);
4102 static void net_rx_action(struct softirq_action
*h
)
4104 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
4105 unsigned long time_limit
= jiffies
+ 2;
4106 int budget
= netdev_budget
;
4109 local_irq_disable();
4111 while (!list_empty(&sd
->poll_list
)) {
4112 struct napi_struct
*n
;
4115 /* If softirq window is exhuasted then punt.
4116 * Allow this to run for 2 jiffies since which will allow
4117 * an average latency of 1.5/HZ.
4119 if (unlikely(budget
<= 0 || time_after_eq(jiffies
, time_limit
)))
4124 /* Even though interrupts have been re-enabled, this
4125 * access is safe because interrupts can only add new
4126 * entries to the tail of this list, and only ->poll()
4127 * calls can remove this head entry from the list.
4129 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
4131 have
= netpoll_poll_lock(n
);
4135 /* This NAPI_STATE_SCHED test is for avoiding a race
4136 * with netpoll's poll_napi(). Only the entity which
4137 * obtains the lock and sees NAPI_STATE_SCHED set will
4138 * actually make the ->poll() call. Therefore we avoid
4139 * accidentally calling ->poll() when NAPI is not scheduled.
4142 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4143 work
= n
->poll(n
, weight
);
4147 WARN_ON_ONCE(work
> weight
);
4151 local_irq_disable();
4153 /* Drivers must not modify the NAPI state if they
4154 * consume the entire weight. In such cases this code
4155 * still "owns" the NAPI instance and therefore can
4156 * move the instance around on the list at-will.
4158 if (unlikely(work
== weight
)) {
4159 if (unlikely(napi_disable_pending(n
))) {
4162 local_irq_disable();
4165 /* flush too old packets
4166 * If HZ < 1000, flush all packets.
4169 napi_gro_flush(n
, HZ
>= 1000);
4170 local_irq_disable();
4172 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4176 netpoll_poll_unlock(have
);
4179 net_rps_action_and_irq_enable(sd
);
4181 #ifdef CONFIG_NET_DMA
4183 * There may not be any more sk_buffs coming right now, so push
4184 * any pending DMA copies to hardware
4186 dma_issue_pending_all();
4193 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4197 struct netdev_upper
{
4198 struct net_device
*dev
;
4200 struct list_head list
;
4201 struct rcu_head rcu
;
4202 struct list_head search_list
;
4205 static void __append_search_uppers(struct list_head
*search_list
,
4206 struct net_device
*dev
)
4208 struct netdev_upper
*upper
;
4210 list_for_each_entry(upper
, &dev
->upper_dev_list
, list
) {
4211 /* check if this upper is not already in search list */
4212 if (list_empty(&upper
->search_list
))
4213 list_add_tail(&upper
->search_list
, search_list
);
4217 static bool __netdev_search_upper_dev(struct net_device
*dev
,
4218 struct net_device
*upper_dev
)
4220 LIST_HEAD(search_list
);
4221 struct netdev_upper
*upper
;
4222 struct netdev_upper
*tmp
;
4225 __append_search_uppers(&search_list
, dev
);
4226 list_for_each_entry(upper
, &search_list
, search_list
) {
4227 if (upper
->dev
== upper_dev
) {
4231 __append_search_uppers(&search_list
, upper
->dev
);
4233 list_for_each_entry_safe(upper
, tmp
, &search_list
, search_list
)
4234 INIT_LIST_HEAD(&upper
->search_list
);
4238 static struct netdev_upper
*__netdev_find_upper(struct net_device
*dev
,
4239 struct net_device
*upper_dev
)
4241 struct netdev_upper
*upper
;
4243 list_for_each_entry(upper
, &dev
->upper_dev_list
, list
) {
4244 if (upper
->dev
== upper_dev
)
4251 * netdev_has_upper_dev - Check if device is linked to an upper device
4253 * @upper_dev: upper device to check
4255 * Find out if a device is linked to specified upper device and return true
4256 * in case it is. Note that this checks only immediate upper device,
4257 * not through a complete stack of devices. The caller must hold the RTNL lock.
4259 bool netdev_has_upper_dev(struct net_device
*dev
,
4260 struct net_device
*upper_dev
)
4264 return __netdev_find_upper(dev
, upper_dev
);
4266 EXPORT_SYMBOL(netdev_has_upper_dev
);
4269 * netdev_has_any_upper_dev - Check if device is linked to some device
4272 * Find out if a device is linked to an upper device and return true in case
4273 * it is. The caller must hold the RTNL lock.
4275 bool netdev_has_any_upper_dev(struct net_device
*dev
)
4279 return !list_empty(&dev
->upper_dev_list
);
4281 EXPORT_SYMBOL(netdev_has_any_upper_dev
);
4284 * netdev_master_upper_dev_get - Get master upper device
4287 * Find a master upper device and return pointer to it or NULL in case
4288 * it's not there. The caller must hold the RTNL lock.
4290 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4292 struct netdev_upper
*upper
;
4296 if (list_empty(&dev
->upper_dev_list
))
4299 upper
= list_first_entry(&dev
->upper_dev_list
,
4300 struct netdev_upper
, list
);
4301 if (likely(upper
->master
))
4305 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4308 * netdev_master_upper_dev_get_rcu - Get master upper device
4311 * Find a master upper device and return pointer to it or NULL in case
4312 * it's not there. The caller must hold the RCU read lock.
4314 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4316 struct netdev_upper
*upper
;
4318 upper
= list_first_or_null_rcu(&dev
->upper_dev_list
,
4319 struct netdev_upper
, list
);
4320 if (upper
&& likely(upper
->master
))
4324 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4326 static int __netdev_upper_dev_link(struct net_device
*dev
,
4327 struct net_device
*upper_dev
, bool master
)
4329 struct netdev_upper
*upper
;
4333 if (dev
== upper_dev
)
4336 /* To prevent loops, check if dev is not upper device to upper_dev. */
4337 if (__netdev_search_upper_dev(upper_dev
, dev
))
4340 if (__netdev_find_upper(dev
, upper_dev
))
4343 if (master
&& netdev_master_upper_dev_get(dev
))
4346 upper
= kmalloc(sizeof(*upper
), GFP_KERNEL
);
4350 upper
->dev
= upper_dev
;
4351 upper
->master
= master
;
4352 INIT_LIST_HEAD(&upper
->search_list
);
4354 /* Ensure that master upper link is always the first item in list. */
4356 list_add_rcu(&upper
->list
, &dev
->upper_dev_list
);
4358 list_add_tail_rcu(&upper
->list
, &dev
->upper_dev_list
);
4359 dev_hold(upper_dev
);
4365 * netdev_upper_dev_link - Add a link to the upper device
4367 * @upper_dev: new upper device
4369 * Adds a link to device which is upper to this one. The caller must hold
4370 * the RTNL lock. On a failure a negative errno code is returned.
4371 * On success the reference counts are adjusted and the function
4374 int netdev_upper_dev_link(struct net_device
*dev
,
4375 struct net_device
*upper_dev
)
4377 return __netdev_upper_dev_link(dev
, upper_dev
, false);
4379 EXPORT_SYMBOL(netdev_upper_dev_link
);
4382 * netdev_master_upper_dev_link - Add a master link to the upper device
4384 * @upper_dev: new upper device
4386 * Adds a link to device which is upper to this one. In this case, only
4387 * one master upper device can be linked, although other non-master devices
4388 * might be linked as well. The caller must hold the RTNL lock.
4389 * On a failure a negative errno code is returned. On success the reference
4390 * counts are adjusted and the function returns zero.
4392 int netdev_master_upper_dev_link(struct net_device
*dev
,
4393 struct net_device
*upper_dev
)
4395 return __netdev_upper_dev_link(dev
, upper_dev
, true);
4397 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
4400 * netdev_upper_dev_unlink - Removes a link to upper device
4402 * @upper_dev: new upper device
4404 * Removes a link to device which is upper to this one. The caller must hold
4407 void netdev_upper_dev_unlink(struct net_device
*dev
,
4408 struct net_device
*upper_dev
)
4410 struct netdev_upper
*upper
;
4414 upper
= __netdev_find_upper(dev
, upper_dev
);
4417 list_del_rcu(&upper
->list
);
4419 kfree_rcu(upper
, rcu
);
4421 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
4423 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4425 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4427 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
4428 ops
->ndo_change_rx_flags(dev
, flags
);
4431 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4433 unsigned int old_flags
= dev
->flags
;
4439 dev
->flags
|= IFF_PROMISC
;
4440 dev
->promiscuity
+= inc
;
4441 if (dev
->promiscuity
== 0) {
4444 * If inc causes overflow, untouch promisc and return error.
4447 dev
->flags
&= ~IFF_PROMISC
;
4449 dev
->promiscuity
-= inc
;
4450 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4455 if (dev
->flags
!= old_flags
) {
4456 pr_info("device %s %s promiscuous mode\n",
4458 dev
->flags
& IFF_PROMISC
? "entered" : "left");
4459 if (audit_enabled
) {
4460 current_uid_gid(&uid
, &gid
);
4461 audit_log(current
->audit_context
, GFP_ATOMIC
,
4462 AUDIT_ANOM_PROMISCUOUS
,
4463 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4464 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4465 (old_flags
& IFF_PROMISC
),
4466 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
4467 from_kuid(&init_user_ns
, uid
),
4468 from_kgid(&init_user_ns
, gid
),
4469 audit_get_sessionid(current
));
4472 dev_change_rx_flags(dev
, IFF_PROMISC
);
4478 * dev_set_promiscuity - update promiscuity count on a device
4482 * Add or remove promiscuity from a device. While the count in the device
4483 * remains above zero the interface remains promiscuous. Once it hits zero
4484 * the device reverts back to normal filtering operation. A negative inc
4485 * value is used to drop promiscuity on the device.
4486 * Return 0 if successful or a negative errno code on error.
4488 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4490 unsigned int old_flags
= dev
->flags
;
4493 err
= __dev_set_promiscuity(dev
, inc
);
4496 if (dev
->flags
!= old_flags
)
4497 dev_set_rx_mode(dev
);
4500 EXPORT_SYMBOL(dev_set_promiscuity
);
4503 * dev_set_allmulti - update allmulti count on a device
4507 * Add or remove reception of all multicast frames to a device. While the
4508 * count in the device remains above zero the interface remains listening
4509 * to all interfaces. Once it hits zero the device reverts back to normal
4510 * filtering operation. A negative @inc value is used to drop the counter
4511 * when releasing a resource needing all multicasts.
4512 * Return 0 if successful or a negative errno code on error.
4515 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4517 unsigned int old_flags
= dev
->flags
;
4521 dev
->flags
|= IFF_ALLMULTI
;
4522 dev
->allmulti
+= inc
;
4523 if (dev
->allmulti
== 0) {
4526 * If inc causes overflow, untouch allmulti and return error.
4529 dev
->flags
&= ~IFF_ALLMULTI
;
4531 dev
->allmulti
-= inc
;
4532 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4537 if (dev
->flags
^ old_flags
) {
4538 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4539 dev_set_rx_mode(dev
);
4543 EXPORT_SYMBOL(dev_set_allmulti
);
4546 * Upload unicast and multicast address lists to device and
4547 * configure RX filtering. When the device doesn't support unicast
4548 * filtering it is put in promiscuous mode while unicast addresses
4551 void __dev_set_rx_mode(struct net_device
*dev
)
4553 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4555 /* dev_open will call this function so the list will stay sane. */
4556 if (!(dev
->flags
&IFF_UP
))
4559 if (!netif_device_present(dev
))
4562 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
4563 /* Unicast addresses changes may only happen under the rtnl,
4564 * therefore calling __dev_set_promiscuity here is safe.
4566 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4567 __dev_set_promiscuity(dev
, 1);
4568 dev
->uc_promisc
= true;
4569 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4570 __dev_set_promiscuity(dev
, -1);
4571 dev
->uc_promisc
= false;
4575 if (ops
->ndo_set_rx_mode
)
4576 ops
->ndo_set_rx_mode(dev
);
4579 void dev_set_rx_mode(struct net_device
*dev
)
4581 netif_addr_lock_bh(dev
);
4582 __dev_set_rx_mode(dev
);
4583 netif_addr_unlock_bh(dev
);
4587 * dev_get_flags - get flags reported to userspace
4590 * Get the combination of flag bits exported through APIs to userspace.
4592 unsigned int dev_get_flags(const struct net_device
*dev
)
4596 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4601 (dev
->gflags
& (IFF_PROMISC
|
4604 if (netif_running(dev
)) {
4605 if (netif_oper_up(dev
))
4606 flags
|= IFF_RUNNING
;
4607 if (netif_carrier_ok(dev
))
4608 flags
|= IFF_LOWER_UP
;
4609 if (netif_dormant(dev
))
4610 flags
|= IFF_DORMANT
;
4615 EXPORT_SYMBOL(dev_get_flags
);
4617 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4619 unsigned int old_flags
= dev
->flags
;
4625 * Set the flags on our device.
4628 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4629 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4631 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4635 * Load in the correct multicast list now the flags have changed.
4638 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4639 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4641 dev_set_rx_mode(dev
);
4644 * Have we downed the interface. We handle IFF_UP ourselves
4645 * according to user attempts to set it, rather than blindly
4650 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4651 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4654 dev_set_rx_mode(dev
);
4657 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4658 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4660 dev
->gflags
^= IFF_PROMISC
;
4661 dev_set_promiscuity(dev
, inc
);
4664 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4665 is important. Some (broken) drivers set IFF_PROMISC, when
4666 IFF_ALLMULTI is requested not asking us and not reporting.
4668 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4669 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4671 dev
->gflags
^= IFF_ALLMULTI
;
4672 dev_set_allmulti(dev
, inc
);
4678 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4680 unsigned int changes
= dev
->flags
^ old_flags
;
4682 if (changes
& IFF_UP
) {
4683 if (dev
->flags
& IFF_UP
)
4684 call_netdevice_notifiers(NETDEV_UP
, dev
);
4686 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4689 if (dev
->flags
& IFF_UP
&&
4690 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4691 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4695 * dev_change_flags - change device settings
4697 * @flags: device state flags
4699 * Change settings on device based state flags. The flags are
4700 * in the userspace exported format.
4702 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4705 unsigned int changes
, old_flags
= dev
->flags
;
4707 ret
= __dev_change_flags(dev
, flags
);
4711 changes
= old_flags
^ dev
->flags
;
4713 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4715 __dev_notify_flags(dev
, old_flags
);
4718 EXPORT_SYMBOL(dev_change_flags
);
4721 * dev_set_mtu - Change maximum transfer unit
4723 * @new_mtu: new transfer unit
4725 * Change the maximum transfer size of the network device.
4727 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4729 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4732 if (new_mtu
== dev
->mtu
)
4735 /* MTU must be positive. */
4739 if (!netif_device_present(dev
))
4743 if (ops
->ndo_change_mtu
)
4744 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4749 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4752 EXPORT_SYMBOL(dev_set_mtu
);
4755 * dev_set_group - Change group this device belongs to
4757 * @new_group: group this device should belong to
4759 void dev_set_group(struct net_device
*dev
, int new_group
)
4761 dev
->group
= new_group
;
4763 EXPORT_SYMBOL(dev_set_group
);
4766 * dev_set_mac_address - Change Media Access Control Address
4770 * Change the hardware (MAC) address of the device
4772 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4774 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4777 if (!ops
->ndo_set_mac_address
)
4779 if (sa
->sa_family
!= dev
->type
)
4781 if (!netif_device_present(dev
))
4783 err
= ops
->ndo_set_mac_address(dev
, sa
);
4786 dev
->addr_assign_type
= NET_ADDR_SET
;
4787 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4788 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
4791 EXPORT_SYMBOL(dev_set_mac_address
);
4794 * dev_change_carrier - Change device carrier
4796 * @new_carrier: new value
4798 * Change device carrier
4800 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
4802 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4804 if (!ops
->ndo_change_carrier
)
4806 if (!netif_device_present(dev
))
4808 return ops
->ndo_change_carrier(dev
, new_carrier
);
4810 EXPORT_SYMBOL(dev_change_carrier
);
4813 * dev_new_index - allocate an ifindex
4814 * @net: the applicable net namespace
4816 * Returns a suitable unique value for a new device interface
4817 * number. The caller must hold the rtnl semaphore or the
4818 * dev_base_lock to be sure it remains unique.
4820 static int dev_new_index(struct net
*net
)
4822 int ifindex
= net
->ifindex
;
4826 if (!__dev_get_by_index(net
, ifindex
))
4827 return net
->ifindex
= ifindex
;
4831 /* Delayed registration/unregisteration */
4832 static LIST_HEAD(net_todo_list
);
4834 static void net_set_todo(struct net_device
*dev
)
4836 list_add_tail(&dev
->todo_list
, &net_todo_list
);
4839 static void rollback_registered_many(struct list_head
*head
)
4841 struct net_device
*dev
, *tmp
;
4843 BUG_ON(dev_boot_phase
);
4846 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
4847 /* Some devices call without registering
4848 * for initialization unwind. Remove those
4849 * devices and proceed with the remaining.
4851 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
4852 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
4856 list_del(&dev
->unreg_list
);
4859 dev
->dismantle
= true;
4860 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
4863 /* If device is running, close it first. */
4864 dev_close_many(head
);
4866 list_for_each_entry(dev
, head
, unreg_list
) {
4867 /* And unlink it from device chain. */
4868 unlist_netdevice(dev
);
4870 dev
->reg_state
= NETREG_UNREGISTERING
;
4875 list_for_each_entry(dev
, head
, unreg_list
) {
4876 /* Shutdown queueing discipline. */
4880 /* Notify protocols, that we are about to destroy
4881 this device. They should clean all the things.
4883 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
4885 if (!dev
->rtnl_link_ops
||
4886 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
4887 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
4890 * Flush the unicast and multicast chains
4895 if (dev
->netdev_ops
->ndo_uninit
)
4896 dev
->netdev_ops
->ndo_uninit(dev
);
4898 /* Notifier chain MUST detach us all upper devices. */
4899 WARN_ON(netdev_has_any_upper_dev(dev
));
4901 /* Remove entries from kobject tree */
4902 netdev_unregister_kobject(dev
);
4904 /* Remove XPS queueing entries */
4905 netif_reset_xps_queues_gt(dev
, 0);
4911 list_for_each_entry(dev
, head
, unreg_list
)
4915 static void rollback_registered(struct net_device
*dev
)
4919 list_add(&dev
->unreg_list
, &single
);
4920 rollback_registered_many(&single
);
4924 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
4925 netdev_features_t features
)
4927 /* Fix illegal checksum combinations */
4928 if ((features
& NETIF_F_HW_CSUM
) &&
4929 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
4930 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
4931 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
4934 /* TSO requires that SG is present as well. */
4935 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
4936 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
4937 features
&= ~NETIF_F_ALL_TSO
;
4940 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
4941 !(features
& NETIF_F_IP_CSUM
)) {
4942 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
4943 features
&= ~NETIF_F_TSO
;
4944 features
&= ~NETIF_F_TSO_ECN
;
4947 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
4948 !(features
& NETIF_F_IPV6_CSUM
)) {
4949 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
4950 features
&= ~NETIF_F_TSO6
;
4953 /* TSO ECN requires that TSO is present as well. */
4954 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
4955 features
&= ~NETIF_F_TSO_ECN
;
4957 /* Software GSO depends on SG. */
4958 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
4959 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
4960 features
&= ~NETIF_F_GSO
;
4963 /* UFO needs SG and checksumming */
4964 if (features
& NETIF_F_UFO
) {
4965 /* maybe split UFO into V4 and V6? */
4966 if (!((features
& NETIF_F_GEN_CSUM
) ||
4967 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
4968 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
4970 "Dropping NETIF_F_UFO since no checksum offload features.\n");
4971 features
&= ~NETIF_F_UFO
;
4974 if (!(features
& NETIF_F_SG
)) {
4976 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
4977 features
&= ~NETIF_F_UFO
;
4984 int __netdev_update_features(struct net_device
*dev
)
4986 netdev_features_t features
;
4991 features
= netdev_get_wanted_features(dev
);
4993 if (dev
->netdev_ops
->ndo_fix_features
)
4994 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
4996 /* driver might be less strict about feature dependencies */
4997 features
= netdev_fix_features(dev
, features
);
4999 if (dev
->features
== features
)
5002 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5003 &dev
->features
, &features
);
5005 if (dev
->netdev_ops
->ndo_set_features
)
5006 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5008 if (unlikely(err
< 0)) {
5010 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5011 err
, &features
, &dev
->features
);
5016 dev
->features
= features
;
5022 * netdev_update_features - recalculate device features
5023 * @dev: the device to check
5025 * Recalculate dev->features set and send notifications if it
5026 * has changed. Should be called after driver or hardware dependent
5027 * conditions might have changed that influence the features.
5029 void netdev_update_features(struct net_device
*dev
)
5031 if (__netdev_update_features(dev
))
5032 netdev_features_change(dev
);
5034 EXPORT_SYMBOL(netdev_update_features
);
5037 * netdev_change_features - recalculate device features
5038 * @dev: the device to check
5040 * Recalculate dev->features set and send notifications even
5041 * if they have not changed. Should be called instead of
5042 * netdev_update_features() if also dev->vlan_features might
5043 * have changed to allow the changes to be propagated to stacked
5046 void netdev_change_features(struct net_device
*dev
)
5048 __netdev_update_features(dev
);
5049 netdev_features_change(dev
);
5051 EXPORT_SYMBOL(netdev_change_features
);
5054 * netif_stacked_transfer_operstate - transfer operstate
5055 * @rootdev: the root or lower level device to transfer state from
5056 * @dev: the device to transfer operstate to
5058 * Transfer operational state from root to device. This is normally
5059 * called when a stacking relationship exists between the root
5060 * device and the device(a leaf device).
5062 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5063 struct net_device
*dev
)
5065 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5066 netif_dormant_on(dev
);
5068 netif_dormant_off(dev
);
5070 if (netif_carrier_ok(rootdev
)) {
5071 if (!netif_carrier_ok(dev
))
5072 netif_carrier_on(dev
);
5074 if (netif_carrier_ok(dev
))
5075 netif_carrier_off(dev
);
5078 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5081 static int netif_alloc_rx_queues(struct net_device
*dev
)
5083 unsigned int i
, count
= dev
->num_rx_queues
;
5084 struct netdev_rx_queue
*rx
;
5088 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5094 for (i
= 0; i
< count
; i
++)
5100 static void netdev_init_one_queue(struct net_device
*dev
,
5101 struct netdev_queue
*queue
, void *_unused
)
5103 /* Initialize queue lock */
5104 spin_lock_init(&queue
->_xmit_lock
);
5105 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5106 queue
->xmit_lock_owner
= -1;
5107 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5110 dql_init(&queue
->dql
, HZ
);
5114 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5116 unsigned int count
= dev
->num_tx_queues
;
5117 struct netdev_queue
*tx
;
5121 tx
= kcalloc(count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5127 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5128 spin_lock_init(&dev
->tx_global_lock
);
5134 * register_netdevice - register a network device
5135 * @dev: device to register
5137 * Take a completed network device structure and add it to the kernel
5138 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5139 * chain. 0 is returned on success. A negative errno code is returned
5140 * on a failure to set up the device, or if the name is a duplicate.
5142 * Callers must hold the rtnl semaphore. You may want
5143 * register_netdev() instead of this.
5146 * The locking appears insufficient to guarantee two parallel registers
5147 * will not get the same name.
5150 int register_netdevice(struct net_device
*dev
)
5153 struct net
*net
= dev_net(dev
);
5155 BUG_ON(dev_boot_phase
);
5160 /* When net_device's are persistent, this will be fatal. */
5161 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5164 spin_lock_init(&dev
->addr_list_lock
);
5165 netdev_set_addr_lockdep_class(dev
);
5169 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
5173 /* Init, if this function is available */
5174 if (dev
->netdev_ops
->ndo_init
) {
5175 ret
= dev
->netdev_ops
->ndo_init(dev
);
5183 if (((dev
->hw_features
| dev
->features
) &
5184 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
5185 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
5186 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
5187 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
5194 dev
->ifindex
= dev_new_index(net
);
5195 else if (__dev_get_by_index(net
, dev
->ifindex
))
5198 if (dev
->iflink
== -1)
5199 dev
->iflink
= dev
->ifindex
;
5201 /* Transfer changeable features to wanted_features and enable
5202 * software offloads (GSO and GRO).
5204 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5205 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5206 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5208 /* Turn on no cache copy if HW is doing checksum */
5209 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5210 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5211 if (dev
->features
& NETIF_F_ALL_CSUM
) {
5212 dev
->wanted_features
|= NETIF_F_NOCACHE_COPY
;
5213 dev
->features
|= NETIF_F_NOCACHE_COPY
;
5217 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5219 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5221 /* Make NETIF_F_SG inheritable to tunnel devices.
5223 dev
->hw_enc_features
|= NETIF_F_SG
;
5225 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5226 ret
= notifier_to_errno(ret
);
5230 ret
= netdev_register_kobject(dev
);
5233 dev
->reg_state
= NETREG_REGISTERED
;
5235 __netdev_update_features(dev
);
5238 * Default initial state at registry is that the
5239 * device is present.
5242 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5244 linkwatch_init_dev(dev
);
5246 dev_init_scheduler(dev
);
5248 list_netdevice(dev
);
5249 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5251 /* If the device has permanent device address, driver should
5252 * set dev_addr and also addr_assign_type should be set to
5253 * NET_ADDR_PERM (default value).
5255 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
5256 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
5258 /* Notify protocols, that a new device appeared. */
5259 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5260 ret
= notifier_to_errno(ret
);
5262 rollback_registered(dev
);
5263 dev
->reg_state
= NETREG_UNREGISTERED
;
5266 * Prevent userspace races by waiting until the network
5267 * device is fully setup before sending notifications.
5269 if (!dev
->rtnl_link_ops
||
5270 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5271 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5277 if (dev
->netdev_ops
->ndo_uninit
)
5278 dev
->netdev_ops
->ndo_uninit(dev
);
5281 EXPORT_SYMBOL(register_netdevice
);
5284 * init_dummy_netdev - init a dummy network device for NAPI
5285 * @dev: device to init
5287 * This takes a network device structure and initialize the minimum
5288 * amount of fields so it can be used to schedule NAPI polls without
5289 * registering a full blown interface. This is to be used by drivers
5290 * that need to tie several hardware interfaces to a single NAPI
5291 * poll scheduler due to HW limitations.
5293 int init_dummy_netdev(struct net_device
*dev
)
5295 /* Clear everything. Note we don't initialize spinlocks
5296 * are they aren't supposed to be taken by any of the
5297 * NAPI code and this dummy netdev is supposed to be
5298 * only ever used for NAPI polls
5300 memset(dev
, 0, sizeof(struct net_device
));
5302 /* make sure we BUG if trying to hit standard
5303 * register/unregister code path
5305 dev
->reg_state
= NETREG_DUMMY
;
5307 /* NAPI wants this */
5308 INIT_LIST_HEAD(&dev
->napi_list
);
5310 /* a dummy interface is started by default */
5311 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5312 set_bit(__LINK_STATE_START
, &dev
->state
);
5314 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5315 * because users of this 'device' dont need to change
5321 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5325 * register_netdev - register a network device
5326 * @dev: device to register
5328 * Take a completed network device structure and add it to the kernel
5329 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5330 * chain. 0 is returned on success. A negative errno code is returned
5331 * on a failure to set up the device, or if the name is a duplicate.
5333 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5334 * and expands the device name if you passed a format string to
5337 int register_netdev(struct net_device
*dev
)
5342 err
= register_netdevice(dev
);
5346 EXPORT_SYMBOL(register_netdev
);
5348 int netdev_refcnt_read(const struct net_device
*dev
)
5352 for_each_possible_cpu(i
)
5353 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5356 EXPORT_SYMBOL(netdev_refcnt_read
);
5359 * netdev_wait_allrefs - wait until all references are gone.
5360 * @dev: target net_device
5362 * This is called when unregistering network devices.
5364 * Any protocol or device that holds a reference should register
5365 * for netdevice notification, and cleanup and put back the
5366 * reference if they receive an UNREGISTER event.
5367 * We can get stuck here if buggy protocols don't correctly
5370 static void netdev_wait_allrefs(struct net_device
*dev
)
5372 unsigned long rebroadcast_time
, warning_time
;
5375 linkwatch_forget_dev(dev
);
5377 rebroadcast_time
= warning_time
= jiffies
;
5378 refcnt
= netdev_refcnt_read(dev
);
5380 while (refcnt
!= 0) {
5381 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5384 /* Rebroadcast unregister notification */
5385 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5391 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5392 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5394 /* We must not have linkwatch events
5395 * pending on unregister. If this
5396 * happens, we simply run the queue
5397 * unscheduled, resulting in a noop
5400 linkwatch_run_queue();
5405 rebroadcast_time
= jiffies
;
5410 refcnt
= netdev_refcnt_read(dev
);
5412 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5413 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5415 warning_time
= jiffies
;
5424 * register_netdevice(x1);
5425 * register_netdevice(x2);
5427 * unregister_netdevice(y1);
5428 * unregister_netdevice(y2);
5434 * We are invoked by rtnl_unlock().
5435 * This allows us to deal with problems:
5436 * 1) We can delete sysfs objects which invoke hotplug
5437 * without deadlocking with linkwatch via keventd.
5438 * 2) Since we run with the RTNL semaphore not held, we can sleep
5439 * safely in order to wait for the netdev refcnt to drop to zero.
5441 * We must not return until all unregister events added during
5442 * the interval the lock was held have been completed.
5444 void netdev_run_todo(void)
5446 struct list_head list
;
5448 /* Snapshot list, allow later requests */
5449 list_replace_init(&net_todo_list
, &list
);
5454 /* Wait for rcu callbacks to finish before next phase */
5455 if (!list_empty(&list
))
5458 while (!list_empty(&list
)) {
5459 struct net_device
*dev
5460 = list_first_entry(&list
, struct net_device
, todo_list
);
5461 list_del(&dev
->todo_list
);
5464 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5467 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5468 pr_err("network todo '%s' but state %d\n",
5469 dev
->name
, dev
->reg_state
);
5474 dev
->reg_state
= NETREG_UNREGISTERED
;
5476 on_each_cpu(flush_backlog
, dev
, 1);
5478 netdev_wait_allrefs(dev
);
5481 BUG_ON(netdev_refcnt_read(dev
));
5482 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
5483 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
5484 WARN_ON(dev
->dn_ptr
);
5486 if (dev
->destructor
)
5487 dev
->destructor(dev
);
5489 /* Free network device */
5490 kobject_put(&dev
->dev
.kobj
);
5494 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5495 * fields in the same order, with only the type differing.
5497 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5498 const struct net_device_stats
*netdev_stats
)
5500 #if BITS_PER_LONG == 64
5501 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5502 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5504 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5505 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5506 u64
*dst
= (u64
*)stats64
;
5508 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5509 sizeof(*stats64
) / sizeof(u64
));
5510 for (i
= 0; i
< n
; i
++)
5514 EXPORT_SYMBOL(netdev_stats_to_stats64
);
5517 * dev_get_stats - get network device statistics
5518 * @dev: device to get statistics from
5519 * @storage: place to store stats
5521 * Get network statistics from device. Return @storage.
5522 * The device driver may provide its own method by setting
5523 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5524 * otherwise the internal statistics structure is used.
5526 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5527 struct rtnl_link_stats64
*storage
)
5529 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5531 if (ops
->ndo_get_stats64
) {
5532 memset(storage
, 0, sizeof(*storage
));
5533 ops
->ndo_get_stats64(dev
, storage
);
5534 } else if (ops
->ndo_get_stats
) {
5535 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5537 netdev_stats_to_stats64(storage
, &dev
->stats
);
5539 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
5542 EXPORT_SYMBOL(dev_get_stats
);
5544 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
5546 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
5548 #ifdef CONFIG_NET_CLS_ACT
5551 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
5554 netdev_init_one_queue(dev
, queue
, NULL
);
5555 queue
->qdisc
= &noop_qdisc
;
5556 queue
->qdisc_sleeping
= &noop_qdisc
;
5557 rcu_assign_pointer(dev
->ingress_queue
, queue
);
5562 static const struct ethtool_ops default_ethtool_ops
;
5564 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
5565 const struct ethtool_ops
*ops
)
5567 if (dev
->ethtool_ops
== &default_ethtool_ops
)
5568 dev
->ethtool_ops
= ops
;
5570 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
5573 * alloc_netdev_mqs - allocate network device
5574 * @sizeof_priv: size of private data to allocate space for
5575 * @name: device name format string
5576 * @setup: callback to initialize device
5577 * @txqs: the number of TX subqueues to allocate
5578 * @rxqs: the number of RX subqueues to allocate
5580 * Allocates a struct net_device with private data area for driver use
5581 * and performs basic initialization. Also allocates subquue structs
5582 * for each queue on the device.
5584 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
5585 void (*setup
)(struct net_device
*),
5586 unsigned int txqs
, unsigned int rxqs
)
5588 struct net_device
*dev
;
5590 struct net_device
*p
;
5592 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5595 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5601 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5606 alloc_size
= sizeof(struct net_device
);
5608 /* ensure 32-byte alignment of private area */
5609 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5610 alloc_size
+= sizeof_priv
;
5612 /* ensure 32-byte alignment of whole construct */
5613 alloc_size
+= NETDEV_ALIGN
- 1;
5615 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5619 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5620 dev
->padded
= (char *)dev
- (char *)p
;
5622 dev
->pcpu_refcnt
= alloc_percpu(int);
5623 if (!dev
->pcpu_refcnt
)
5626 if (dev_addr_init(dev
))
5632 dev_net_set(dev
, &init_net
);
5634 dev
->gso_max_size
= GSO_MAX_SIZE
;
5635 dev
->gso_max_segs
= GSO_MAX_SEGS
;
5637 INIT_LIST_HEAD(&dev
->napi_list
);
5638 INIT_LIST_HEAD(&dev
->unreg_list
);
5639 INIT_LIST_HEAD(&dev
->link_watch_list
);
5640 INIT_LIST_HEAD(&dev
->upper_dev_list
);
5641 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
5644 dev
->num_tx_queues
= txqs
;
5645 dev
->real_num_tx_queues
= txqs
;
5646 if (netif_alloc_netdev_queues(dev
))
5650 dev
->num_rx_queues
= rxqs
;
5651 dev
->real_num_rx_queues
= rxqs
;
5652 if (netif_alloc_rx_queues(dev
))
5656 strcpy(dev
->name
, name
);
5657 dev
->group
= INIT_NETDEV_GROUP
;
5658 if (!dev
->ethtool_ops
)
5659 dev
->ethtool_ops
= &default_ethtool_ops
;
5667 free_percpu(dev
->pcpu_refcnt
);
5677 EXPORT_SYMBOL(alloc_netdev_mqs
);
5680 * free_netdev - free network device
5683 * This function does the last stage of destroying an allocated device
5684 * interface. The reference to the device object is released.
5685 * If this is the last reference then it will be freed.
5687 void free_netdev(struct net_device
*dev
)
5689 struct napi_struct
*p
, *n
;
5691 release_net(dev_net(dev
));
5698 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
5700 /* Flush device addresses */
5701 dev_addr_flush(dev
);
5703 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
5706 free_percpu(dev
->pcpu_refcnt
);
5707 dev
->pcpu_refcnt
= NULL
;
5709 /* Compatibility with error handling in drivers */
5710 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5711 kfree((char *)dev
- dev
->padded
);
5715 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
5716 dev
->reg_state
= NETREG_RELEASED
;
5718 /* will free via device release */
5719 put_device(&dev
->dev
);
5721 EXPORT_SYMBOL(free_netdev
);
5724 * synchronize_net - Synchronize with packet receive processing
5726 * Wait for packets currently being received to be done.
5727 * Does not block later packets from starting.
5729 void synchronize_net(void)
5732 if (rtnl_is_locked())
5733 synchronize_rcu_expedited();
5737 EXPORT_SYMBOL(synchronize_net
);
5740 * unregister_netdevice_queue - remove device from the kernel
5744 * This function shuts down a device interface and removes it
5745 * from the kernel tables.
5746 * If head not NULL, device is queued to be unregistered later.
5748 * Callers must hold the rtnl semaphore. You may want
5749 * unregister_netdev() instead of this.
5752 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
5757 list_move_tail(&dev
->unreg_list
, head
);
5759 rollback_registered(dev
);
5760 /* Finish processing unregister after unlock */
5764 EXPORT_SYMBOL(unregister_netdevice_queue
);
5767 * unregister_netdevice_many - unregister many devices
5768 * @head: list of devices
5770 void unregister_netdevice_many(struct list_head
*head
)
5772 struct net_device
*dev
;
5774 if (!list_empty(head
)) {
5775 rollback_registered_many(head
);
5776 list_for_each_entry(dev
, head
, unreg_list
)
5780 EXPORT_SYMBOL(unregister_netdevice_many
);
5783 * unregister_netdev - remove device from the kernel
5786 * This function shuts down a device interface and removes it
5787 * from the kernel tables.
5789 * This is just a wrapper for unregister_netdevice that takes
5790 * the rtnl semaphore. In general you want to use this and not
5791 * unregister_netdevice.
5793 void unregister_netdev(struct net_device
*dev
)
5796 unregister_netdevice(dev
);
5799 EXPORT_SYMBOL(unregister_netdev
);
5802 * dev_change_net_namespace - move device to different nethost namespace
5804 * @net: network namespace
5805 * @pat: If not NULL name pattern to try if the current device name
5806 * is already taken in the destination network namespace.
5808 * This function shuts down a device interface and moves it
5809 * to a new network namespace. On success 0 is returned, on
5810 * a failure a netagive errno code is returned.
5812 * Callers must hold the rtnl semaphore.
5815 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
5821 /* Don't allow namespace local devices to be moved. */
5823 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
5826 /* Ensure the device has been registrered */
5827 if (dev
->reg_state
!= NETREG_REGISTERED
)
5830 /* Get out if there is nothing todo */
5832 if (net_eq(dev_net(dev
), net
))
5835 /* Pick the destination device name, and ensure
5836 * we can use it in the destination network namespace.
5839 if (__dev_get_by_name(net
, dev
->name
)) {
5840 /* We get here if we can't use the current device name */
5843 if (dev_get_valid_name(net
, dev
, pat
) < 0)
5848 * And now a mini version of register_netdevice unregister_netdevice.
5851 /* If device is running close it first. */
5854 /* And unlink it from device chain */
5856 unlist_netdevice(dev
);
5860 /* Shutdown queueing discipline. */
5863 /* Notify protocols, that we are about to destroy
5864 this device. They should clean all the things.
5866 Note that dev->reg_state stays at NETREG_REGISTERED.
5867 This is wanted because this way 8021q and macvlan know
5868 the device is just moving and can keep their slaves up.
5870 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5872 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5873 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
5876 * Flush the unicast and multicast chains
5881 /* Send a netdev-removed uevent to the old namespace */
5882 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
5884 /* Actually switch the network namespace */
5885 dev_net_set(dev
, net
);
5887 /* If there is an ifindex conflict assign a new one */
5888 if (__dev_get_by_index(net
, dev
->ifindex
)) {
5889 int iflink
= (dev
->iflink
== dev
->ifindex
);
5890 dev
->ifindex
= dev_new_index(net
);
5892 dev
->iflink
= dev
->ifindex
;
5895 /* Send a netdev-add uevent to the new namespace */
5896 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
5898 /* Fixup kobjects */
5899 err
= device_rename(&dev
->dev
, dev
->name
);
5902 /* Add the device back in the hashes */
5903 list_netdevice(dev
);
5905 /* Notify protocols, that a new device appeared. */
5906 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5909 * Prevent userspace races by waiting until the network
5910 * device is fully setup before sending notifications.
5912 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5919 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
5921 static int dev_cpu_callback(struct notifier_block
*nfb
,
5922 unsigned long action
,
5925 struct sk_buff
**list_skb
;
5926 struct sk_buff
*skb
;
5927 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
5928 struct softnet_data
*sd
, *oldsd
;
5930 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
5933 local_irq_disable();
5934 cpu
= smp_processor_id();
5935 sd
= &per_cpu(softnet_data
, cpu
);
5936 oldsd
= &per_cpu(softnet_data
, oldcpu
);
5938 /* Find end of our completion_queue. */
5939 list_skb
= &sd
->completion_queue
;
5941 list_skb
= &(*list_skb
)->next
;
5942 /* Append completion queue from offline CPU. */
5943 *list_skb
= oldsd
->completion_queue
;
5944 oldsd
->completion_queue
= NULL
;
5946 /* Append output queue from offline CPU. */
5947 if (oldsd
->output_queue
) {
5948 *sd
->output_queue_tailp
= oldsd
->output_queue
;
5949 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
5950 oldsd
->output_queue
= NULL
;
5951 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
5953 /* Append NAPI poll list from offline CPU. */
5954 if (!list_empty(&oldsd
->poll_list
)) {
5955 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
5956 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
5959 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
5962 /* Process offline CPU's input_pkt_queue */
5963 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
5965 input_queue_head_incr(oldsd
);
5967 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
5969 input_queue_head_incr(oldsd
);
5977 * netdev_increment_features - increment feature set by one
5978 * @all: current feature set
5979 * @one: new feature set
5980 * @mask: mask feature set
5982 * Computes a new feature set after adding a device with feature set
5983 * @one to the master device with current feature set @all. Will not
5984 * enable anything that is off in @mask. Returns the new feature set.
5986 netdev_features_t
netdev_increment_features(netdev_features_t all
,
5987 netdev_features_t one
, netdev_features_t mask
)
5989 if (mask
& NETIF_F_GEN_CSUM
)
5990 mask
|= NETIF_F_ALL_CSUM
;
5991 mask
|= NETIF_F_VLAN_CHALLENGED
;
5993 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
5994 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
5996 /* If one device supports hw checksumming, set for all. */
5997 if (all
& NETIF_F_GEN_CSUM
)
5998 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6002 EXPORT_SYMBOL(netdev_increment_features
);
6004 static struct hlist_head
*netdev_create_hash(void)
6007 struct hlist_head
*hash
;
6009 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6011 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6012 INIT_HLIST_HEAD(&hash
[i
]);
6017 /* Initialize per network namespace state */
6018 static int __net_init
netdev_init(struct net
*net
)
6020 if (net
!= &init_net
)
6021 INIT_LIST_HEAD(&net
->dev_base_head
);
6023 net
->dev_name_head
= netdev_create_hash();
6024 if (net
->dev_name_head
== NULL
)
6027 net
->dev_index_head
= netdev_create_hash();
6028 if (net
->dev_index_head
== NULL
)
6034 kfree(net
->dev_name_head
);
6040 * netdev_drivername - network driver for the device
6041 * @dev: network device
6043 * Determine network driver for device.
6045 const char *netdev_drivername(const struct net_device
*dev
)
6047 const struct device_driver
*driver
;
6048 const struct device
*parent
;
6049 const char *empty
= "";
6051 parent
= dev
->dev
.parent
;
6055 driver
= parent
->driver
;
6056 if (driver
&& driver
->name
)
6057 return driver
->name
;
6061 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6062 struct va_format
*vaf
)
6066 if (dev
&& dev
->dev
.parent
) {
6067 r
= dev_printk_emit(level
[1] - '0',
6070 dev_driver_string(dev
->dev
.parent
),
6071 dev_name(dev
->dev
.parent
),
6072 netdev_name(dev
), vaf
);
6074 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6076 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6082 int netdev_printk(const char *level
, const struct net_device
*dev
,
6083 const char *format
, ...)
6085 struct va_format vaf
;
6089 va_start(args
, format
);
6094 r
= __netdev_printk(level
, dev
, &vaf
);
6100 EXPORT_SYMBOL(netdev_printk
);
6102 #define define_netdev_printk_level(func, level) \
6103 int func(const struct net_device *dev, const char *fmt, ...) \
6106 struct va_format vaf; \
6109 va_start(args, fmt); \
6114 r = __netdev_printk(level, dev, &vaf); \
6120 EXPORT_SYMBOL(func);
6122 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6123 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6124 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6125 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6126 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6127 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6128 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6130 static void __net_exit
netdev_exit(struct net
*net
)
6132 kfree(net
->dev_name_head
);
6133 kfree(net
->dev_index_head
);
6136 static struct pernet_operations __net_initdata netdev_net_ops
= {
6137 .init
= netdev_init
,
6138 .exit
= netdev_exit
,
6141 static void __net_exit
default_device_exit(struct net
*net
)
6143 struct net_device
*dev
, *aux
;
6145 * Push all migratable network devices back to the
6146 * initial network namespace
6149 for_each_netdev_safe(net
, dev
, aux
) {
6151 char fb_name
[IFNAMSIZ
];
6153 /* Ignore unmoveable devices (i.e. loopback) */
6154 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6157 /* Leave virtual devices for the generic cleanup */
6158 if (dev
->rtnl_link_ops
)
6161 /* Push remaining network devices to init_net */
6162 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6163 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6165 pr_emerg("%s: failed to move %s to init_net: %d\n",
6166 __func__
, dev
->name
, err
);
6173 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6175 /* At exit all network devices most be removed from a network
6176 * namespace. Do this in the reverse order of registration.
6177 * Do this across as many network namespaces as possible to
6178 * improve batching efficiency.
6180 struct net_device
*dev
;
6182 LIST_HEAD(dev_kill_list
);
6185 list_for_each_entry(net
, net_list
, exit_list
) {
6186 for_each_netdev_reverse(net
, dev
) {
6187 if (dev
->rtnl_link_ops
)
6188 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6190 unregister_netdevice_queue(dev
, &dev_kill_list
);
6193 unregister_netdevice_many(&dev_kill_list
);
6194 list_del(&dev_kill_list
);
6198 static struct pernet_operations __net_initdata default_device_ops
= {
6199 .exit
= default_device_exit
,
6200 .exit_batch
= default_device_exit_batch
,
6204 * Initialize the DEV module. At boot time this walks the device list and
6205 * unhooks any devices that fail to initialise (normally hardware not
6206 * present) and leaves us with a valid list of present and active devices.
6211 * This is called single threaded during boot, so no need
6212 * to take the rtnl semaphore.
6214 static int __init
net_dev_init(void)
6216 int i
, rc
= -ENOMEM
;
6218 BUG_ON(!dev_boot_phase
);
6220 if (dev_proc_init())
6223 if (netdev_kobject_init())
6226 INIT_LIST_HEAD(&ptype_all
);
6227 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6228 INIT_LIST_HEAD(&ptype_base
[i
]);
6230 INIT_LIST_HEAD(&offload_base
);
6232 if (register_pernet_subsys(&netdev_net_ops
))
6236 * Initialise the packet receive queues.
6239 for_each_possible_cpu(i
) {
6240 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6242 memset(sd
, 0, sizeof(*sd
));
6243 skb_queue_head_init(&sd
->input_pkt_queue
);
6244 skb_queue_head_init(&sd
->process_queue
);
6245 sd
->completion_queue
= NULL
;
6246 INIT_LIST_HEAD(&sd
->poll_list
);
6247 sd
->output_queue
= NULL
;
6248 sd
->output_queue_tailp
= &sd
->output_queue
;
6250 sd
->csd
.func
= rps_trigger_softirq
;
6256 sd
->backlog
.poll
= process_backlog
;
6257 sd
->backlog
.weight
= weight_p
;
6258 sd
->backlog
.gro_list
= NULL
;
6259 sd
->backlog
.gro_count
= 0;
6264 /* The loopback device is special if any other network devices
6265 * is present in a network namespace the loopback device must
6266 * be present. Since we now dynamically allocate and free the
6267 * loopback device ensure this invariant is maintained by
6268 * keeping the loopback device as the first device on the
6269 * list of network devices. Ensuring the loopback devices
6270 * is the first device that appears and the last network device
6273 if (register_pernet_device(&loopback_net_ops
))
6276 if (register_pernet_device(&default_device_ops
))
6279 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6280 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6282 hotcpu_notifier(dev_cpu_callback
, 0);
6289 subsys_initcall(net_dev_init
);