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 <net/busy_poll.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/stat.h>
103 #include <net/dst_metadata.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/module.h>
110 #include <linux/netpoll.h>
111 #include <linux/rcupdate.h>
112 #include <linux/delay.h>
113 #include <net/iw_handler.h>
114 #include <asm/current.h>
115 #include <linux/audit.h>
116 #include <linux/dmaengine.h>
117 #include <linux/err.h>
118 #include <linux/ctype.h>
119 #include <linux/if_arp.h>
120 #include <linux/if_vlan.h>
121 #include <linux/ip.h>
123 #include <net/mpls.h>
124 #include <linux/ipv6.h>
125 #include <linux/in.h>
126 #include <linux/jhash.h>
127 #include <linux/random.h>
128 #include <trace/events/napi.h>
129 #include <trace/events/net.h>
130 #include <trace/events/skb.h>
131 #include <linux/pci.h>
132 #include <linux/inetdevice.h>
133 #include <linux/cpu_rmap.h>
134 #include <linux/static_key.h>
135 #include <linux/hashtable.h>
136 #include <linux/vmalloc.h>
137 #include <linux/if_macvlan.h>
138 #include <linux/errqueue.h>
139 #include <linux/hrtimer.h>
140 #include <linux/netfilter_ingress.h>
141 #include <linux/sctp.h>
143 #include "net-sysfs.h"
145 /* Instead of increasing this, you should create a hash table. */
146 #define MAX_GRO_SKBS 8
148 /* This should be increased if a protocol with a bigger head is added. */
149 #define GRO_MAX_HEAD (MAX_HEADER + 128)
151 static DEFINE_SPINLOCK(ptype_lock
);
152 static DEFINE_SPINLOCK(offload_lock
);
153 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
154 struct list_head ptype_all __read_mostly
; /* Taps */
155 static struct list_head offload_base __read_mostly
;
157 static int netif_rx_internal(struct sk_buff
*skb
);
158 static int call_netdevice_notifiers_info(unsigned long val
,
159 struct net_device
*dev
,
160 struct netdev_notifier_info
*info
);
163 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
166 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
168 * Writers must hold the rtnl semaphore while they loop through the
169 * dev_base_head list, and hold dev_base_lock for writing when they do the
170 * actual updates. This allows pure readers to access the list even
171 * while a writer is preparing to update it.
173 * To put it another way, dev_base_lock is held for writing only to
174 * protect against pure readers; the rtnl semaphore provides the
175 * protection against other writers.
177 * See, for example usages, register_netdevice() and
178 * unregister_netdevice(), which must be called with the rtnl
181 DEFINE_RWLOCK(dev_base_lock
);
182 EXPORT_SYMBOL(dev_base_lock
);
184 /* protects napi_hash addition/deletion and napi_gen_id */
185 static DEFINE_SPINLOCK(napi_hash_lock
);
187 static unsigned int napi_gen_id
= NR_CPUS
;
188 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash
, 8);
190 static seqcount_t devnet_rename_seq
;
192 static inline void dev_base_seq_inc(struct net
*net
)
194 while (++net
->dev_base_seq
== 0);
197 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
199 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
201 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
204 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
206 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
209 static inline void rps_lock(struct softnet_data
*sd
)
212 spin_lock(&sd
->input_pkt_queue
.lock
);
216 static inline void rps_unlock(struct softnet_data
*sd
)
219 spin_unlock(&sd
->input_pkt_queue
.lock
);
223 /* Device list insertion */
224 static void list_netdevice(struct net_device
*dev
)
226 struct net
*net
= dev_net(dev
);
230 write_lock_bh(&dev_base_lock
);
231 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
232 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
233 hlist_add_head_rcu(&dev
->index_hlist
,
234 dev_index_hash(net
, dev
->ifindex
));
235 write_unlock_bh(&dev_base_lock
);
237 dev_base_seq_inc(net
);
240 /* Device list removal
241 * caller must respect a RCU grace period before freeing/reusing dev
243 static void unlist_netdevice(struct net_device
*dev
)
247 /* Unlink dev from the device chain */
248 write_lock_bh(&dev_base_lock
);
249 list_del_rcu(&dev
->dev_list
);
250 hlist_del_rcu(&dev
->name_hlist
);
251 hlist_del_rcu(&dev
->index_hlist
);
252 write_unlock_bh(&dev_base_lock
);
254 dev_base_seq_inc(dev_net(dev
));
261 static RAW_NOTIFIER_HEAD(netdev_chain
);
264 * Device drivers call our routines to queue packets here. We empty the
265 * queue in the local softnet handler.
268 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
269 EXPORT_PER_CPU_SYMBOL(softnet_data
);
271 #ifdef CONFIG_LOCKDEP
273 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
274 * according to dev->type
276 static const unsigned short netdev_lock_type
[] =
277 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
278 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
279 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
280 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
281 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
282 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
283 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
284 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
285 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
286 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
287 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
288 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
289 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
290 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
291 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
293 static const char *const netdev_lock_name
[] =
294 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
295 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
296 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
297 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
298 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
299 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
300 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
301 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
302 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
303 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
304 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
305 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
306 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
307 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
308 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
310 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
311 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
313 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
317 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
318 if (netdev_lock_type
[i
] == dev_type
)
320 /* the last key is used by default */
321 return ARRAY_SIZE(netdev_lock_type
) - 1;
324 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
325 unsigned short dev_type
)
329 i
= netdev_lock_pos(dev_type
);
330 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
331 netdev_lock_name
[i
]);
334 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
338 i
= netdev_lock_pos(dev
->type
);
339 lockdep_set_class_and_name(&dev
->addr_list_lock
,
340 &netdev_addr_lock_key
[i
],
341 netdev_lock_name
[i
]);
344 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
345 unsigned short dev_type
)
348 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
353 /*******************************************************************************
355 Protocol management and registration routines
357 *******************************************************************************/
360 * Add a protocol ID to the list. Now that the input handler is
361 * smarter we can dispense with all the messy stuff that used to be
364 * BEWARE!!! Protocol handlers, mangling input packets,
365 * MUST BE last in hash buckets and checking protocol handlers
366 * MUST start from promiscuous ptype_all chain in net_bh.
367 * It is true now, do not change it.
368 * Explanation follows: if protocol handler, mangling packet, will
369 * be the first on list, it is not able to sense, that packet
370 * is cloned and should be copied-on-write, so that it will
371 * change it and subsequent readers will get broken packet.
375 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
377 if (pt
->type
== htons(ETH_P_ALL
))
378 return pt
->dev
? &pt
->dev
->ptype_all
: &ptype_all
;
380 return pt
->dev
? &pt
->dev
->ptype_specific
:
381 &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
385 * dev_add_pack - add packet handler
386 * @pt: packet type declaration
388 * Add a protocol handler to the networking stack. The passed &packet_type
389 * is linked into kernel lists and may not be freed until it has been
390 * removed from the kernel lists.
392 * This call does not sleep therefore it can not
393 * guarantee all CPU's that are in middle of receiving packets
394 * will see the new packet type (until the next received packet).
397 void dev_add_pack(struct packet_type
*pt
)
399 struct list_head
*head
= ptype_head(pt
);
401 spin_lock(&ptype_lock
);
402 list_add_rcu(&pt
->list
, head
);
403 spin_unlock(&ptype_lock
);
405 EXPORT_SYMBOL(dev_add_pack
);
408 * __dev_remove_pack - remove packet handler
409 * @pt: packet type declaration
411 * Remove a protocol handler that was previously added to the kernel
412 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
413 * from the kernel lists and can be freed or reused once this function
416 * The packet type might still be in use by receivers
417 * and must not be freed until after all the CPU's have gone
418 * through a quiescent state.
420 void __dev_remove_pack(struct packet_type
*pt
)
422 struct list_head
*head
= ptype_head(pt
);
423 struct packet_type
*pt1
;
425 spin_lock(&ptype_lock
);
427 list_for_each_entry(pt1
, head
, list
) {
429 list_del_rcu(&pt
->list
);
434 pr_warn("dev_remove_pack: %p not found\n", pt
);
436 spin_unlock(&ptype_lock
);
438 EXPORT_SYMBOL(__dev_remove_pack
);
441 * dev_remove_pack - remove packet handler
442 * @pt: packet type declaration
444 * Remove a protocol handler that was previously added to the kernel
445 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
446 * from the kernel lists and can be freed or reused once this function
449 * This call sleeps to guarantee that no CPU is looking at the packet
452 void dev_remove_pack(struct packet_type
*pt
)
454 __dev_remove_pack(pt
);
458 EXPORT_SYMBOL(dev_remove_pack
);
462 * dev_add_offload - register offload handlers
463 * @po: protocol offload declaration
465 * Add protocol offload handlers to the networking stack. The passed
466 * &proto_offload is linked into kernel lists and may not be freed until
467 * it has been removed from the kernel lists.
469 * This call does not sleep therefore it can not
470 * guarantee all CPU's that are in middle of receiving packets
471 * will see the new offload handlers (until the next received packet).
473 void dev_add_offload(struct packet_offload
*po
)
475 struct packet_offload
*elem
;
477 spin_lock(&offload_lock
);
478 list_for_each_entry(elem
, &offload_base
, list
) {
479 if (po
->priority
< elem
->priority
)
482 list_add_rcu(&po
->list
, elem
->list
.prev
);
483 spin_unlock(&offload_lock
);
485 EXPORT_SYMBOL(dev_add_offload
);
488 * __dev_remove_offload - remove offload handler
489 * @po: packet offload declaration
491 * Remove a protocol offload handler that was previously added to the
492 * kernel offload handlers by dev_add_offload(). The passed &offload_type
493 * is removed from the kernel lists and can be freed or reused once this
496 * The packet type might still be in use by receivers
497 * and must not be freed until after all the CPU's have gone
498 * through a quiescent state.
500 static void __dev_remove_offload(struct packet_offload
*po
)
502 struct list_head
*head
= &offload_base
;
503 struct packet_offload
*po1
;
505 spin_lock(&offload_lock
);
507 list_for_each_entry(po1
, head
, list
) {
509 list_del_rcu(&po
->list
);
514 pr_warn("dev_remove_offload: %p not found\n", po
);
516 spin_unlock(&offload_lock
);
520 * dev_remove_offload - remove packet offload handler
521 * @po: packet offload declaration
523 * Remove a packet offload handler that was previously added to the kernel
524 * offload handlers by dev_add_offload(). The passed &offload_type is
525 * removed from the kernel lists and can be freed or reused once this
528 * This call sleeps to guarantee that no CPU is looking at the packet
531 void dev_remove_offload(struct packet_offload
*po
)
533 __dev_remove_offload(po
);
537 EXPORT_SYMBOL(dev_remove_offload
);
539 /******************************************************************************
541 Device Boot-time Settings Routines
543 *******************************************************************************/
545 /* Boot time configuration table */
546 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
549 * netdev_boot_setup_add - add new setup entry
550 * @name: name of the device
551 * @map: configured settings for the device
553 * Adds new setup entry to the dev_boot_setup list. The function
554 * returns 0 on error and 1 on success. This is a generic routine to
557 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
559 struct netdev_boot_setup
*s
;
563 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
564 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
565 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
566 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
567 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
572 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
576 * netdev_boot_setup_check - check boot time settings
577 * @dev: the netdevice
579 * Check boot time settings for the device.
580 * The found settings are set for the device to be used
581 * later in the device probing.
582 * Returns 0 if no settings found, 1 if they are.
584 int netdev_boot_setup_check(struct net_device
*dev
)
586 struct netdev_boot_setup
*s
= dev_boot_setup
;
589 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
590 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
591 !strcmp(dev
->name
, s
[i
].name
)) {
592 dev
->irq
= s
[i
].map
.irq
;
593 dev
->base_addr
= s
[i
].map
.base_addr
;
594 dev
->mem_start
= s
[i
].map
.mem_start
;
595 dev
->mem_end
= s
[i
].map
.mem_end
;
601 EXPORT_SYMBOL(netdev_boot_setup_check
);
605 * netdev_boot_base - get address from boot time settings
606 * @prefix: prefix for network device
607 * @unit: id for network device
609 * Check boot time settings for the base address of device.
610 * The found settings are set for the device to be used
611 * later in the device probing.
612 * Returns 0 if no settings found.
614 unsigned long netdev_boot_base(const char *prefix
, int unit
)
616 const struct netdev_boot_setup
*s
= dev_boot_setup
;
620 sprintf(name
, "%s%d", prefix
, unit
);
623 * If device already registered then return base of 1
624 * to indicate not to probe for this interface
626 if (__dev_get_by_name(&init_net
, name
))
629 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
630 if (!strcmp(name
, s
[i
].name
))
631 return s
[i
].map
.base_addr
;
636 * Saves at boot time configured settings for any netdevice.
638 int __init
netdev_boot_setup(char *str
)
643 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
648 memset(&map
, 0, sizeof(map
));
652 map
.base_addr
= ints
[2];
654 map
.mem_start
= ints
[3];
656 map
.mem_end
= ints
[4];
658 /* Add new entry to the list */
659 return netdev_boot_setup_add(str
, &map
);
662 __setup("netdev=", netdev_boot_setup
);
664 /*******************************************************************************
666 Device Interface Subroutines
668 *******************************************************************************/
671 * dev_get_iflink - get 'iflink' value of a interface
672 * @dev: targeted interface
674 * Indicates the ifindex the interface is linked to.
675 * Physical interfaces have the same 'ifindex' and 'iflink' values.
678 int dev_get_iflink(const struct net_device
*dev
)
680 if (dev
->netdev_ops
&& dev
->netdev_ops
->ndo_get_iflink
)
681 return dev
->netdev_ops
->ndo_get_iflink(dev
);
685 EXPORT_SYMBOL(dev_get_iflink
);
688 * dev_fill_metadata_dst - Retrieve tunnel egress information.
689 * @dev: targeted interface
692 * For better visibility of tunnel traffic OVS needs to retrieve
693 * egress tunnel information for a packet. Following API allows
694 * user to get this info.
696 int dev_fill_metadata_dst(struct net_device
*dev
, struct sk_buff
*skb
)
698 struct ip_tunnel_info
*info
;
700 if (!dev
->netdev_ops
|| !dev
->netdev_ops
->ndo_fill_metadata_dst
)
703 info
= skb_tunnel_info_unclone(skb
);
706 if (unlikely(!(info
->mode
& IP_TUNNEL_INFO_TX
)))
709 return dev
->netdev_ops
->ndo_fill_metadata_dst(dev
, skb
);
711 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst
);
714 * __dev_get_by_name - find a device by its name
715 * @net: the applicable net namespace
716 * @name: name to find
718 * Find an interface by name. Must be called under RTNL semaphore
719 * or @dev_base_lock. If the name is found a pointer to the device
720 * is returned. If the name is not found then %NULL is returned. The
721 * reference counters are not incremented so the caller must be
722 * careful with locks.
725 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
727 struct net_device
*dev
;
728 struct hlist_head
*head
= dev_name_hash(net
, name
);
730 hlist_for_each_entry(dev
, head
, name_hlist
)
731 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
736 EXPORT_SYMBOL(__dev_get_by_name
);
739 * dev_get_by_name_rcu - find a device by its name
740 * @net: the applicable net namespace
741 * @name: name to find
743 * Find an interface by name.
744 * If the name is found a pointer to the device is returned.
745 * If the name is not found then %NULL is returned.
746 * The reference counters are not incremented so the caller must be
747 * careful with locks. The caller must hold RCU lock.
750 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
752 struct net_device
*dev
;
753 struct hlist_head
*head
= dev_name_hash(net
, name
);
755 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
756 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
761 EXPORT_SYMBOL(dev_get_by_name_rcu
);
764 * dev_get_by_name - find a device by its name
765 * @net: the applicable net namespace
766 * @name: name to find
768 * Find an interface by name. This can be called from any
769 * context and does its own locking. The returned handle has
770 * the usage count incremented and the caller must use dev_put() to
771 * release it when it is no longer needed. %NULL is returned if no
772 * matching device is found.
775 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
777 struct net_device
*dev
;
780 dev
= dev_get_by_name_rcu(net
, name
);
786 EXPORT_SYMBOL(dev_get_by_name
);
789 * __dev_get_by_index - find a device by its ifindex
790 * @net: the applicable net namespace
791 * @ifindex: index of device
793 * Search for an interface by index. Returns %NULL if the device
794 * is not found or a pointer to the device. The device has not
795 * had its reference counter increased so the caller must be careful
796 * about locking. The caller must hold either the RTNL semaphore
800 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
802 struct net_device
*dev
;
803 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
805 hlist_for_each_entry(dev
, head
, index_hlist
)
806 if (dev
->ifindex
== ifindex
)
811 EXPORT_SYMBOL(__dev_get_by_index
);
814 * dev_get_by_index_rcu - find a device by its ifindex
815 * @net: the applicable net namespace
816 * @ifindex: index of device
818 * Search for an interface by index. Returns %NULL if the device
819 * is not found or a pointer to the device. The device has not
820 * had its reference counter increased so the caller must be careful
821 * about locking. The caller must hold RCU lock.
824 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
826 struct net_device
*dev
;
827 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
829 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
830 if (dev
->ifindex
== ifindex
)
835 EXPORT_SYMBOL(dev_get_by_index_rcu
);
839 * dev_get_by_index - find a device by its ifindex
840 * @net: the applicable net namespace
841 * @ifindex: index of device
843 * Search for an interface by index. Returns NULL if the device
844 * is not found or a pointer to the device. The device returned has
845 * had a reference added and the pointer is safe until the user calls
846 * dev_put to indicate they have finished with it.
849 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
851 struct net_device
*dev
;
854 dev
= dev_get_by_index_rcu(net
, ifindex
);
860 EXPORT_SYMBOL(dev_get_by_index
);
863 * netdev_get_name - get a netdevice name, knowing its ifindex.
864 * @net: network namespace
865 * @name: a pointer to the buffer where the name will be stored.
866 * @ifindex: the ifindex of the interface to get the name from.
868 * The use of raw_seqcount_begin() and cond_resched() before
869 * retrying is required as we want to give the writers a chance
870 * to complete when CONFIG_PREEMPT is not set.
872 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
874 struct net_device
*dev
;
878 seq
= raw_seqcount_begin(&devnet_rename_seq
);
880 dev
= dev_get_by_index_rcu(net
, ifindex
);
886 strcpy(name
, dev
->name
);
888 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
897 * dev_getbyhwaddr_rcu - find a device by its hardware address
898 * @net: the applicable net namespace
899 * @type: media type of device
900 * @ha: hardware address
902 * Search for an interface by MAC address. Returns NULL if the device
903 * is not found or a pointer to the device.
904 * The caller must hold RCU or RTNL.
905 * The returned device has not had its ref count increased
906 * and the caller must therefore be careful about locking
910 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
913 struct net_device
*dev
;
915 for_each_netdev_rcu(net
, dev
)
916 if (dev
->type
== type
&&
917 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
922 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
924 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
926 struct net_device
*dev
;
929 for_each_netdev(net
, dev
)
930 if (dev
->type
== type
)
935 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
937 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
939 struct net_device
*dev
, *ret
= NULL
;
942 for_each_netdev_rcu(net
, dev
)
943 if (dev
->type
== type
) {
951 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
954 * __dev_get_by_flags - find any device with given flags
955 * @net: the applicable net namespace
956 * @if_flags: IFF_* values
957 * @mask: bitmask of bits in if_flags to check
959 * Search for any interface with the given flags. Returns NULL if a device
960 * is not found or a pointer to the device. Must be called inside
961 * rtnl_lock(), and result refcount is unchanged.
964 struct net_device
*__dev_get_by_flags(struct net
*net
, unsigned short if_flags
,
967 struct net_device
*dev
, *ret
;
972 for_each_netdev(net
, dev
) {
973 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
980 EXPORT_SYMBOL(__dev_get_by_flags
);
983 * dev_valid_name - check if name is okay for network device
986 * Network device names need to be valid file names to
987 * to allow sysfs to work. We also disallow any kind of
990 bool dev_valid_name(const char *name
)
994 if (strlen(name
) >= IFNAMSIZ
)
996 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
1000 if (*name
== '/' || *name
== ':' || isspace(*name
))
1006 EXPORT_SYMBOL(dev_valid_name
);
1009 * __dev_alloc_name - allocate a name for a device
1010 * @net: network namespace to allocate the device name in
1011 * @name: name format string
1012 * @buf: scratch buffer and result name string
1014 * Passed a format string - eg "lt%d" it will try and find a suitable
1015 * id. It scans list of devices to build up a free map, then chooses
1016 * the first empty slot. The caller must hold the dev_base or rtnl lock
1017 * while allocating the name and adding the device in order to avoid
1019 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1020 * Returns the number of the unit assigned or a negative errno code.
1023 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
1027 const int max_netdevices
= 8*PAGE_SIZE
;
1028 unsigned long *inuse
;
1029 struct net_device
*d
;
1031 p
= strnchr(name
, IFNAMSIZ
-1, '%');
1034 * Verify the string as this thing may have come from
1035 * the user. There must be either one "%d" and no other "%"
1038 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
1041 /* Use one page as a bit array of possible slots */
1042 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
1046 for_each_netdev(net
, d
) {
1047 if (!sscanf(d
->name
, name
, &i
))
1049 if (i
< 0 || i
>= max_netdevices
)
1052 /* avoid cases where sscanf is not exact inverse of printf */
1053 snprintf(buf
, IFNAMSIZ
, name
, i
);
1054 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
1058 i
= find_first_zero_bit(inuse
, max_netdevices
);
1059 free_page((unsigned long) inuse
);
1063 snprintf(buf
, IFNAMSIZ
, name
, i
);
1064 if (!__dev_get_by_name(net
, buf
))
1067 /* It is possible to run out of possible slots
1068 * when the name is long and there isn't enough space left
1069 * for the digits, or if all bits are used.
1075 * dev_alloc_name - allocate a name for a device
1077 * @name: name format string
1079 * Passed a format string - eg "lt%d" it will try and find a suitable
1080 * id. It scans list of devices to build up a free map, then chooses
1081 * the first empty slot. The caller must hold the dev_base or rtnl lock
1082 * while allocating the name and adding the device in order to avoid
1084 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1085 * Returns the number of the unit assigned or a negative errno code.
1088 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1094 BUG_ON(!dev_net(dev
));
1096 ret
= __dev_alloc_name(net
, name
, buf
);
1098 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1101 EXPORT_SYMBOL(dev_alloc_name
);
1103 static int dev_alloc_name_ns(struct net
*net
,
1104 struct net_device
*dev
,
1110 ret
= __dev_alloc_name(net
, name
, buf
);
1112 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1116 static int dev_get_valid_name(struct net
*net
,
1117 struct net_device
*dev
,
1122 if (!dev_valid_name(name
))
1125 if (strchr(name
, '%'))
1126 return dev_alloc_name_ns(net
, dev
, name
);
1127 else if (__dev_get_by_name(net
, name
))
1129 else if (dev
->name
!= name
)
1130 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1136 * dev_change_name - change name of a device
1138 * @newname: name (or format string) must be at least IFNAMSIZ
1140 * Change name of a device, can pass format strings "eth%d".
1143 int dev_change_name(struct net_device
*dev
, const char *newname
)
1145 unsigned char old_assign_type
;
1146 char oldname
[IFNAMSIZ
];
1152 BUG_ON(!dev_net(dev
));
1155 if (dev
->flags
& IFF_UP
)
1158 write_seqcount_begin(&devnet_rename_seq
);
1160 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1161 write_seqcount_end(&devnet_rename_seq
);
1165 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1167 err
= dev_get_valid_name(net
, dev
, newname
);
1169 write_seqcount_end(&devnet_rename_seq
);
1173 if (oldname
[0] && !strchr(oldname
, '%'))
1174 netdev_info(dev
, "renamed from %s\n", oldname
);
1176 old_assign_type
= dev
->name_assign_type
;
1177 dev
->name_assign_type
= NET_NAME_RENAMED
;
1180 ret
= device_rename(&dev
->dev
, dev
->name
);
1182 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1183 dev
->name_assign_type
= old_assign_type
;
1184 write_seqcount_end(&devnet_rename_seq
);
1188 write_seqcount_end(&devnet_rename_seq
);
1190 netdev_adjacent_rename_links(dev
, oldname
);
1192 write_lock_bh(&dev_base_lock
);
1193 hlist_del_rcu(&dev
->name_hlist
);
1194 write_unlock_bh(&dev_base_lock
);
1198 write_lock_bh(&dev_base_lock
);
1199 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1200 write_unlock_bh(&dev_base_lock
);
1202 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1203 ret
= notifier_to_errno(ret
);
1206 /* err >= 0 after dev_alloc_name() or stores the first errno */
1209 write_seqcount_begin(&devnet_rename_seq
);
1210 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1211 memcpy(oldname
, newname
, IFNAMSIZ
);
1212 dev
->name_assign_type
= old_assign_type
;
1213 old_assign_type
= NET_NAME_RENAMED
;
1216 pr_err("%s: name change rollback failed: %d\n",
1225 * dev_set_alias - change ifalias of a device
1227 * @alias: name up to IFALIASZ
1228 * @len: limit of bytes to copy from info
1230 * Set ifalias for a device,
1232 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1238 if (len
>= IFALIASZ
)
1242 kfree(dev
->ifalias
);
1243 dev
->ifalias
= NULL
;
1247 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1250 dev
->ifalias
= new_ifalias
;
1252 strlcpy(dev
->ifalias
, alias
, len
+1);
1258 * netdev_features_change - device changes features
1259 * @dev: device to cause notification
1261 * Called to indicate a device has changed features.
1263 void netdev_features_change(struct net_device
*dev
)
1265 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1267 EXPORT_SYMBOL(netdev_features_change
);
1270 * netdev_state_change - device changes state
1271 * @dev: device to cause notification
1273 * Called to indicate a device has changed state. This function calls
1274 * the notifier chains for netdev_chain and sends a NEWLINK message
1275 * to the routing socket.
1277 void netdev_state_change(struct net_device
*dev
)
1279 if (dev
->flags
& IFF_UP
) {
1280 struct netdev_notifier_change_info change_info
;
1282 change_info
.flags_changed
= 0;
1283 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
1285 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0, GFP_KERNEL
);
1288 EXPORT_SYMBOL(netdev_state_change
);
1291 * netdev_notify_peers - notify network peers about existence of @dev
1292 * @dev: network device
1294 * Generate traffic such that interested network peers are aware of
1295 * @dev, such as by generating a gratuitous ARP. This may be used when
1296 * a device wants to inform the rest of the network about some sort of
1297 * reconfiguration such as a failover event or virtual machine
1300 void netdev_notify_peers(struct net_device
*dev
)
1303 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1306 EXPORT_SYMBOL(netdev_notify_peers
);
1308 static int __dev_open(struct net_device
*dev
)
1310 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1315 if (!netif_device_present(dev
))
1318 /* Block netpoll from trying to do any rx path servicing.
1319 * If we don't do this there is a chance ndo_poll_controller
1320 * or ndo_poll may be running while we open the device
1322 netpoll_poll_disable(dev
);
1324 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1325 ret
= notifier_to_errno(ret
);
1329 set_bit(__LINK_STATE_START
, &dev
->state
);
1331 if (ops
->ndo_validate_addr
)
1332 ret
= ops
->ndo_validate_addr(dev
);
1334 if (!ret
&& ops
->ndo_open
)
1335 ret
= ops
->ndo_open(dev
);
1337 netpoll_poll_enable(dev
);
1340 clear_bit(__LINK_STATE_START
, &dev
->state
);
1342 dev
->flags
|= IFF_UP
;
1343 dev_set_rx_mode(dev
);
1345 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1352 * dev_open - prepare an interface for use.
1353 * @dev: device to open
1355 * Takes a device from down to up state. The device's private open
1356 * function is invoked and then the multicast lists are loaded. Finally
1357 * the device is moved into the up state and a %NETDEV_UP message is
1358 * sent to the netdev notifier chain.
1360 * Calling this function on an active interface is a nop. On a failure
1361 * a negative errno code is returned.
1363 int dev_open(struct net_device
*dev
)
1367 if (dev
->flags
& IFF_UP
)
1370 ret
= __dev_open(dev
);
1374 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1375 call_netdevice_notifiers(NETDEV_UP
, dev
);
1379 EXPORT_SYMBOL(dev_open
);
1381 static int __dev_close_many(struct list_head
*head
)
1383 struct net_device
*dev
;
1388 list_for_each_entry(dev
, head
, close_list
) {
1389 /* Temporarily disable netpoll until the interface is down */
1390 netpoll_poll_disable(dev
);
1392 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1394 clear_bit(__LINK_STATE_START
, &dev
->state
);
1396 /* Synchronize to scheduled poll. We cannot touch poll list, it
1397 * can be even on different cpu. So just clear netif_running().
1399 * dev->stop() will invoke napi_disable() on all of it's
1400 * napi_struct instances on this device.
1402 smp_mb__after_atomic(); /* Commit netif_running(). */
1405 dev_deactivate_many(head
);
1407 list_for_each_entry(dev
, head
, close_list
) {
1408 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1411 * Call the device specific close. This cannot fail.
1412 * Only if device is UP
1414 * We allow it to be called even after a DETACH hot-plug
1420 dev
->flags
&= ~IFF_UP
;
1421 netpoll_poll_enable(dev
);
1427 static int __dev_close(struct net_device
*dev
)
1432 list_add(&dev
->close_list
, &single
);
1433 retval
= __dev_close_many(&single
);
1439 int dev_close_many(struct list_head
*head
, bool unlink
)
1441 struct net_device
*dev
, *tmp
;
1443 /* Remove the devices that don't need to be closed */
1444 list_for_each_entry_safe(dev
, tmp
, head
, close_list
)
1445 if (!(dev
->flags
& IFF_UP
))
1446 list_del_init(&dev
->close_list
);
1448 __dev_close_many(head
);
1450 list_for_each_entry_safe(dev
, tmp
, head
, close_list
) {
1451 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
, GFP_KERNEL
);
1452 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1454 list_del_init(&dev
->close_list
);
1459 EXPORT_SYMBOL(dev_close_many
);
1462 * dev_close - shutdown an interface.
1463 * @dev: device to shutdown
1465 * This function moves an active device into down state. A
1466 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1467 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1470 int dev_close(struct net_device
*dev
)
1472 if (dev
->flags
& IFF_UP
) {
1475 list_add(&dev
->close_list
, &single
);
1476 dev_close_many(&single
, true);
1481 EXPORT_SYMBOL(dev_close
);
1485 * dev_disable_lro - disable Large Receive Offload on a device
1488 * Disable Large Receive Offload (LRO) on a net device. Must be
1489 * called under RTNL. This is needed if received packets may be
1490 * forwarded to another interface.
1492 void dev_disable_lro(struct net_device
*dev
)
1494 struct net_device
*lower_dev
;
1495 struct list_head
*iter
;
1497 dev
->wanted_features
&= ~NETIF_F_LRO
;
1498 netdev_update_features(dev
);
1500 if (unlikely(dev
->features
& NETIF_F_LRO
))
1501 netdev_WARN(dev
, "failed to disable LRO!\n");
1503 netdev_for_each_lower_dev(dev
, lower_dev
, iter
)
1504 dev_disable_lro(lower_dev
);
1506 EXPORT_SYMBOL(dev_disable_lro
);
1508 static int call_netdevice_notifier(struct notifier_block
*nb
, unsigned long val
,
1509 struct net_device
*dev
)
1511 struct netdev_notifier_info info
;
1513 netdev_notifier_info_init(&info
, dev
);
1514 return nb
->notifier_call(nb
, val
, &info
);
1517 static int dev_boot_phase
= 1;
1520 * register_netdevice_notifier - register a network notifier block
1523 * Register a notifier to be called when network device events occur.
1524 * The notifier passed is linked into the kernel structures and must
1525 * not be reused until it has been unregistered. A negative errno code
1526 * is returned on a failure.
1528 * When registered all registration and up events are replayed
1529 * to the new notifier to allow device to have a race free
1530 * view of the network device list.
1533 int register_netdevice_notifier(struct notifier_block
*nb
)
1535 struct net_device
*dev
;
1536 struct net_device
*last
;
1541 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1547 for_each_netdev(net
, dev
) {
1548 err
= call_netdevice_notifier(nb
, NETDEV_REGISTER
, dev
);
1549 err
= notifier_to_errno(err
);
1553 if (!(dev
->flags
& IFF_UP
))
1556 call_netdevice_notifier(nb
, NETDEV_UP
, dev
);
1567 for_each_netdev(net
, dev
) {
1571 if (dev
->flags
& IFF_UP
) {
1572 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1574 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1576 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1581 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1584 EXPORT_SYMBOL(register_netdevice_notifier
);
1587 * unregister_netdevice_notifier - unregister a network notifier block
1590 * Unregister a notifier previously registered by
1591 * register_netdevice_notifier(). The notifier is unlinked into the
1592 * kernel structures and may then be reused. A negative errno code
1593 * is returned on a failure.
1595 * After unregistering unregister and down device events are synthesized
1596 * for all devices on the device list to the removed notifier to remove
1597 * the need for special case cleanup code.
1600 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1602 struct net_device
*dev
;
1607 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1612 for_each_netdev(net
, dev
) {
1613 if (dev
->flags
& IFF_UP
) {
1614 call_netdevice_notifier(nb
, NETDEV_GOING_DOWN
,
1616 call_netdevice_notifier(nb
, NETDEV_DOWN
, dev
);
1618 call_netdevice_notifier(nb
, NETDEV_UNREGISTER
, dev
);
1625 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1628 * call_netdevice_notifiers_info - call all network notifier blocks
1629 * @val: value passed unmodified to notifier function
1630 * @dev: net_device pointer passed unmodified to notifier function
1631 * @info: notifier information data
1633 * Call all network notifier blocks. Parameters and return value
1634 * are as for raw_notifier_call_chain().
1637 static int call_netdevice_notifiers_info(unsigned long val
,
1638 struct net_device
*dev
,
1639 struct netdev_notifier_info
*info
)
1642 netdev_notifier_info_init(info
, dev
);
1643 return raw_notifier_call_chain(&netdev_chain
, val
, info
);
1647 * call_netdevice_notifiers - call all network notifier blocks
1648 * @val: value passed unmodified to notifier function
1649 * @dev: net_device pointer passed unmodified to notifier function
1651 * Call all network notifier blocks. Parameters and return value
1652 * are as for raw_notifier_call_chain().
1655 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1657 struct netdev_notifier_info info
;
1659 return call_netdevice_notifiers_info(val
, dev
, &info
);
1661 EXPORT_SYMBOL(call_netdevice_notifiers
);
1663 #ifdef CONFIG_NET_INGRESS
1664 static struct static_key ingress_needed __read_mostly
;
1666 void net_inc_ingress_queue(void)
1668 static_key_slow_inc(&ingress_needed
);
1670 EXPORT_SYMBOL_GPL(net_inc_ingress_queue
);
1672 void net_dec_ingress_queue(void)
1674 static_key_slow_dec(&ingress_needed
);
1676 EXPORT_SYMBOL_GPL(net_dec_ingress_queue
);
1679 #ifdef CONFIG_NET_EGRESS
1680 static struct static_key egress_needed __read_mostly
;
1682 void net_inc_egress_queue(void)
1684 static_key_slow_inc(&egress_needed
);
1686 EXPORT_SYMBOL_GPL(net_inc_egress_queue
);
1688 void net_dec_egress_queue(void)
1690 static_key_slow_dec(&egress_needed
);
1692 EXPORT_SYMBOL_GPL(net_dec_egress_queue
);
1695 static struct static_key netstamp_needed __read_mostly
;
1696 #ifdef HAVE_JUMP_LABEL
1697 /* We are not allowed to call static_key_slow_dec() from irq context
1698 * If net_disable_timestamp() is called from irq context, defer the
1699 * static_key_slow_dec() calls.
1701 static atomic_t netstamp_needed_deferred
;
1704 void net_enable_timestamp(void)
1706 #ifdef HAVE_JUMP_LABEL
1707 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1711 static_key_slow_dec(&netstamp_needed
);
1715 static_key_slow_inc(&netstamp_needed
);
1717 EXPORT_SYMBOL(net_enable_timestamp
);
1719 void net_disable_timestamp(void)
1721 #ifdef HAVE_JUMP_LABEL
1722 if (in_interrupt()) {
1723 atomic_inc(&netstamp_needed_deferred
);
1727 static_key_slow_dec(&netstamp_needed
);
1729 EXPORT_SYMBOL(net_disable_timestamp
);
1731 static inline void net_timestamp_set(struct sk_buff
*skb
)
1733 skb
->tstamp
.tv64
= 0;
1734 if (static_key_false(&netstamp_needed
))
1735 __net_timestamp(skb
);
1738 #define net_timestamp_check(COND, SKB) \
1739 if (static_key_false(&netstamp_needed)) { \
1740 if ((COND) && !(SKB)->tstamp.tv64) \
1741 __net_timestamp(SKB); \
1744 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1748 if (!(dev
->flags
& IFF_UP
))
1751 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1752 if (skb
->len
<= len
)
1755 /* if TSO is enabled, we don't care about the length as the packet
1756 * could be forwarded without being segmented before
1758 if (skb_is_gso(skb
))
1763 EXPORT_SYMBOL_GPL(is_skb_forwardable
);
1765 int __dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1767 if (skb_orphan_frags(skb
, GFP_ATOMIC
) ||
1768 unlikely(!is_skb_forwardable(dev
, skb
))) {
1769 atomic_long_inc(&dev
->rx_dropped
);
1774 skb_scrub_packet(skb
, true);
1776 skb
->protocol
= eth_type_trans(skb
, dev
);
1777 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
1781 EXPORT_SYMBOL_GPL(__dev_forward_skb
);
1784 * dev_forward_skb - loopback an skb to another netif
1786 * @dev: destination network device
1787 * @skb: buffer to forward
1790 * NET_RX_SUCCESS (no congestion)
1791 * NET_RX_DROP (packet was dropped, but freed)
1793 * dev_forward_skb can be used for injecting an skb from the
1794 * start_xmit function of one device into the receive queue
1795 * of another device.
1797 * The receiving device may be in another namespace, so
1798 * we have to clear all information in the skb that could
1799 * impact namespace isolation.
1801 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1803 return __dev_forward_skb(dev
, skb
) ?: netif_rx_internal(skb
);
1805 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1807 static inline int deliver_skb(struct sk_buff
*skb
,
1808 struct packet_type
*pt_prev
,
1809 struct net_device
*orig_dev
)
1811 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1813 atomic_inc(&skb
->users
);
1814 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1817 static inline void deliver_ptype_list_skb(struct sk_buff
*skb
,
1818 struct packet_type
**pt
,
1819 struct net_device
*orig_dev
,
1821 struct list_head
*ptype_list
)
1823 struct packet_type
*ptype
, *pt_prev
= *pt
;
1825 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1826 if (ptype
->type
!= type
)
1829 deliver_skb(skb
, pt_prev
, orig_dev
);
1835 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1837 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1840 if (ptype
->id_match
)
1841 return ptype
->id_match(ptype
, skb
->sk
);
1842 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1849 * Support routine. Sends outgoing frames to any network
1850 * taps currently in use.
1853 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1855 struct packet_type
*ptype
;
1856 struct sk_buff
*skb2
= NULL
;
1857 struct packet_type
*pt_prev
= NULL
;
1858 struct list_head
*ptype_list
= &ptype_all
;
1862 list_for_each_entry_rcu(ptype
, ptype_list
, list
) {
1863 /* Never send packets back to the socket
1864 * they originated from - MvS (miquels@drinkel.ow.org)
1866 if (skb_loop_sk(ptype
, skb
))
1870 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1875 /* need to clone skb, done only once */
1876 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1880 net_timestamp_set(skb2
);
1882 /* skb->nh should be correctly
1883 * set by sender, so that the second statement is
1884 * just protection against buggy protocols.
1886 skb_reset_mac_header(skb2
);
1888 if (skb_network_header(skb2
) < skb2
->data
||
1889 skb_network_header(skb2
) > skb_tail_pointer(skb2
)) {
1890 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1891 ntohs(skb2
->protocol
),
1893 skb_reset_network_header(skb2
);
1896 skb2
->transport_header
= skb2
->network_header
;
1897 skb2
->pkt_type
= PACKET_OUTGOING
;
1901 if (ptype_list
== &ptype_all
) {
1902 ptype_list
= &dev
->ptype_all
;
1907 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1912 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1913 * @dev: Network device
1914 * @txq: number of queues available
1916 * If real_num_tx_queues is changed the tc mappings may no longer be
1917 * valid. To resolve this verify the tc mapping remains valid and if
1918 * not NULL the mapping. With no priorities mapping to this
1919 * offset/count pair it will no longer be used. In the worst case TC0
1920 * is invalid nothing can be done so disable priority mappings. If is
1921 * expected that drivers will fix this mapping if they can before
1922 * calling netif_set_real_num_tx_queues.
1924 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1927 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1929 /* If TC0 is invalidated disable TC mapping */
1930 if (tc
->offset
+ tc
->count
> txq
) {
1931 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1936 /* Invalidated prio to tc mappings set to TC0 */
1937 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1938 int q
= netdev_get_prio_tc_map(dev
, i
);
1940 tc
= &dev
->tc_to_txq
[q
];
1941 if (tc
->offset
+ tc
->count
> txq
) {
1942 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1944 netdev_set_prio_tc_map(dev
, i
, 0);
1950 static DEFINE_MUTEX(xps_map_mutex
);
1951 #define xmap_dereference(P) \
1952 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1954 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1957 struct xps_map
*map
= NULL
;
1961 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1963 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1964 if (map
->queues
[pos
] == index
) {
1966 map
->queues
[pos
] = map
->queues
[--map
->len
];
1968 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1969 kfree_rcu(map
, rcu
);
1979 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1981 struct xps_dev_maps
*dev_maps
;
1983 bool active
= false;
1985 mutex_lock(&xps_map_mutex
);
1986 dev_maps
= xmap_dereference(dev
->xps_maps
);
1991 for_each_possible_cpu(cpu
) {
1992 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1993 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1996 if (i
== dev
->num_tx_queues
)
2001 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2002 kfree_rcu(dev_maps
, rcu
);
2005 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
2006 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
2010 mutex_unlock(&xps_map_mutex
);
2013 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
2016 struct xps_map
*new_map
;
2017 int alloc_len
= XPS_MIN_MAP_ALLOC
;
2020 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
2021 if (map
->queues
[pos
] != index
)
2026 /* Need to add queue to this CPU's existing map */
2028 if (pos
< map
->alloc_len
)
2031 alloc_len
= map
->alloc_len
* 2;
2034 /* Need to allocate new map to store queue on this CPU's map */
2035 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
2040 for (i
= 0; i
< pos
; i
++)
2041 new_map
->queues
[i
] = map
->queues
[i
];
2042 new_map
->alloc_len
= alloc_len
;
2048 int netif_set_xps_queue(struct net_device
*dev
, const struct cpumask
*mask
,
2051 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
2052 struct xps_map
*map
, *new_map
;
2053 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
2054 int cpu
, numa_node_id
= -2;
2055 bool active
= false;
2057 mutex_lock(&xps_map_mutex
);
2059 dev_maps
= xmap_dereference(dev
->xps_maps
);
2061 /* allocate memory for queue storage */
2062 for_each_online_cpu(cpu
) {
2063 if (!cpumask_test_cpu(cpu
, mask
))
2067 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
2068 if (!new_dev_maps
) {
2069 mutex_unlock(&xps_map_mutex
);
2073 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2076 map
= expand_xps_map(map
, cpu
, index
);
2080 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2084 goto out_no_new_maps
;
2086 for_each_possible_cpu(cpu
) {
2087 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
2088 /* add queue to CPU maps */
2091 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2092 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
2095 if (pos
== map
->len
)
2096 map
->queues
[map
->len
++] = index
;
2098 if (numa_node_id
== -2)
2099 numa_node_id
= cpu_to_node(cpu
);
2100 else if (numa_node_id
!= cpu_to_node(cpu
))
2103 } else if (dev_maps
) {
2104 /* fill in the new device map from the old device map */
2105 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2106 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
2111 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
2113 /* Cleanup old maps */
2115 for_each_possible_cpu(cpu
) {
2116 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2117 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
2118 if (map
&& map
!= new_map
)
2119 kfree_rcu(map
, rcu
);
2122 kfree_rcu(dev_maps
, rcu
);
2125 dev_maps
= new_dev_maps
;
2129 /* update Tx queue numa node */
2130 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
2131 (numa_node_id
>= 0) ? numa_node_id
:
2137 /* removes queue from unused CPUs */
2138 for_each_possible_cpu(cpu
) {
2139 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
2142 if (remove_xps_queue(dev_maps
, cpu
, index
))
2146 /* free map if not active */
2148 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
2149 kfree_rcu(dev_maps
, rcu
);
2153 mutex_unlock(&xps_map_mutex
);
2157 /* remove any maps that we added */
2158 for_each_possible_cpu(cpu
) {
2159 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2160 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2162 if (new_map
&& new_map
!= map
)
2166 mutex_unlock(&xps_map_mutex
);
2168 kfree(new_dev_maps
);
2171 EXPORT_SYMBOL(netif_set_xps_queue
);
2175 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2176 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2178 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2182 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2185 if (dev
->reg_state
== NETREG_REGISTERED
||
2186 dev
->reg_state
== NETREG_UNREGISTERING
) {
2189 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2195 netif_setup_tc(dev
, txq
);
2197 if (txq
< dev
->real_num_tx_queues
) {
2198 qdisc_reset_all_tx_gt(dev
, txq
);
2200 netif_reset_xps_queues_gt(dev
, txq
);
2205 dev
->real_num_tx_queues
= txq
;
2208 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2212 * netif_set_real_num_rx_queues - set actual number of RX queues used
2213 * @dev: Network device
2214 * @rxq: Actual number of RX queues
2216 * This must be called either with the rtnl_lock held or before
2217 * registration of the net device. Returns 0 on success, or a
2218 * negative error code. If called before registration, it always
2221 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2225 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2228 if (dev
->reg_state
== NETREG_REGISTERED
) {
2231 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2237 dev
->real_num_rx_queues
= rxq
;
2240 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2244 * netif_get_num_default_rss_queues - default number of RSS queues
2246 * This routine should set an upper limit on the number of RSS queues
2247 * used by default by multiqueue devices.
2249 int netif_get_num_default_rss_queues(void)
2251 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2253 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2255 static inline void __netif_reschedule(struct Qdisc
*q
)
2257 struct softnet_data
*sd
;
2258 unsigned long flags
;
2260 local_irq_save(flags
);
2261 sd
= this_cpu_ptr(&softnet_data
);
2262 q
->next_sched
= NULL
;
2263 *sd
->output_queue_tailp
= q
;
2264 sd
->output_queue_tailp
= &q
->next_sched
;
2265 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2266 local_irq_restore(flags
);
2269 void __netif_schedule(struct Qdisc
*q
)
2271 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2272 __netif_reschedule(q
);
2274 EXPORT_SYMBOL(__netif_schedule
);
2276 struct dev_kfree_skb_cb
{
2277 enum skb_free_reason reason
;
2280 static struct dev_kfree_skb_cb
*get_kfree_skb_cb(const struct sk_buff
*skb
)
2282 return (struct dev_kfree_skb_cb
*)skb
->cb
;
2285 void netif_schedule_queue(struct netdev_queue
*txq
)
2288 if (!(txq
->state
& QUEUE_STATE_ANY_XOFF
)) {
2289 struct Qdisc
*q
= rcu_dereference(txq
->qdisc
);
2291 __netif_schedule(q
);
2295 EXPORT_SYMBOL(netif_schedule_queue
);
2298 * netif_wake_subqueue - allow sending packets on subqueue
2299 * @dev: network device
2300 * @queue_index: sub queue index
2302 * Resume individual transmit queue of a device with multiple transmit queues.
2304 void netif_wake_subqueue(struct net_device
*dev
, u16 queue_index
)
2306 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
2308 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &txq
->state
)) {
2312 q
= rcu_dereference(txq
->qdisc
);
2313 __netif_schedule(q
);
2317 EXPORT_SYMBOL(netif_wake_subqueue
);
2319 void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
2321 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF
, &dev_queue
->state
)) {
2325 q
= rcu_dereference(dev_queue
->qdisc
);
2326 __netif_schedule(q
);
2330 EXPORT_SYMBOL(netif_tx_wake_queue
);
2332 void __dev_kfree_skb_irq(struct sk_buff
*skb
, enum skb_free_reason reason
)
2334 unsigned long flags
;
2336 if (likely(atomic_read(&skb
->users
) == 1)) {
2338 atomic_set(&skb
->users
, 0);
2339 } else if (likely(!atomic_dec_and_test(&skb
->users
))) {
2342 get_kfree_skb_cb(skb
)->reason
= reason
;
2343 local_irq_save(flags
);
2344 skb
->next
= __this_cpu_read(softnet_data
.completion_queue
);
2345 __this_cpu_write(softnet_data
.completion_queue
, skb
);
2346 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2347 local_irq_restore(flags
);
2349 EXPORT_SYMBOL(__dev_kfree_skb_irq
);
2351 void __dev_kfree_skb_any(struct sk_buff
*skb
, enum skb_free_reason reason
)
2353 if (in_irq() || irqs_disabled())
2354 __dev_kfree_skb_irq(skb
, reason
);
2358 EXPORT_SYMBOL(__dev_kfree_skb_any
);
2362 * netif_device_detach - mark device as removed
2363 * @dev: network device
2365 * Mark device as removed from system and therefore no longer available.
2367 void netif_device_detach(struct net_device
*dev
)
2369 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2370 netif_running(dev
)) {
2371 netif_tx_stop_all_queues(dev
);
2374 EXPORT_SYMBOL(netif_device_detach
);
2377 * netif_device_attach - mark device as attached
2378 * @dev: network device
2380 * Mark device as attached from system and restart if needed.
2382 void netif_device_attach(struct net_device
*dev
)
2384 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2385 netif_running(dev
)) {
2386 netif_tx_wake_all_queues(dev
);
2387 __netdev_watchdog_up(dev
);
2390 EXPORT_SYMBOL(netif_device_attach
);
2393 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2394 * to be used as a distribution range.
2396 u16
__skb_tx_hash(const struct net_device
*dev
, struct sk_buff
*skb
,
2397 unsigned int num_tx_queues
)
2401 u16 qcount
= num_tx_queues
;
2403 if (skb_rx_queue_recorded(skb
)) {
2404 hash
= skb_get_rx_queue(skb
);
2405 while (unlikely(hash
>= num_tx_queues
))
2406 hash
-= num_tx_queues
;
2411 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2412 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2413 qcount
= dev
->tc_to_txq
[tc
].count
;
2416 return (u16
) reciprocal_scale(skb_get_hash(skb
), qcount
) + qoffset
;
2418 EXPORT_SYMBOL(__skb_tx_hash
);
2420 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2422 static const netdev_features_t null_features
= 0;
2423 struct net_device
*dev
= skb
->dev
;
2424 const char *name
= "";
2426 if (!net_ratelimit())
2430 if (dev
->dev
.parent
)
2431 name
= dev_driver_string(dev
->dev
.parent
);
2433 name
= netdev_name(dev
);
2435 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2436 "gso_type=%d ip_summed=%d\n",
2437 name
, dev
? &dev
->features
: &null_features
,
2438 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2439 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2440 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2444 * Invalidate hardware checksum when packet is to be mangled, and
2445 * complete checksum manually on outgoing path.
2447 int skb_checksum_help(struct sk_buff
*skb
)
2450 int ret
= 0, offset
;
2452 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2453 goto out_set_summed
;
2455 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2456 skb_warn_bad_offload(skb
);
2460 /* Before computing a checksum, we should make sure no frag could
2461 * be modified by an external entity : checksum could be wrong.
2463 if (skb_has_shared_frag(skb
)) {
2464 ret
= __skb_linearize(skb
);
2469 offset
= skb_checksum_start_offset(skb
);
2470 BUG_ON(offset
>= skb_headlen(skb
));
2471 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2473 offset
+= skb
->csum_offset
;
2474 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2476 if (skb_cloned(skb
) &&
2477 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2478 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2483 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2485 skb
->ip_summed
= CHECKSUM_NONE
;
2489 EXPORT_SYMBOL(skb_checksum_help
);
2491 /* skb_csum_offload_check - Driver helper function to determine if a device
2492 * with limited checksum offload capabilities is able to offload the checksum
2493 * for a given packet.
2496 * skb - sk_buff for the packet in question
2497 * spec - contains the description of what device can offload
2498 * csum_encapped - returns true if the checksum being offloaded is
2499 * encpasulated. That is it is checksum for the transport header
2500 * in the inner headers.
2501 * checksum_help - when set indicates that helper function should
2502 * call skb_checksum_help if offload checks fail
2505 * true: Packet has passed the checksum checks and should be offloadable to
2506 * the device (a driver may still need to check for additional
2507 * restrictions of its device)
2508 * false: Checksum is not offloadable. If checksum_help was set then
2509 * skb_checksum_help was called to resolve checksum for non-GSO
2510 * packets and when IP protocol is not SCTP
2512 bool __skb_csum_offload_chk(struct sk_buff
*skb
,
2513 const struct skb_csum_offl_spec
*spec
,
2514 bool *csum_encapped
,
2518 struct ipv6hdr
*ipv6
;
2523 if (skb
->protocol
== htons(ETH_P_8021Q
) ||
2524 skb
->protocol
== htons(ETH_P_8021AD
)) {
2525 if (!spec
->vlan_okay
)
2529 /* We check whether the checksum refers to a transport layer checksum in
2530 * the outermost header or an encapsulated transport layer checksum that
2531 * corresponds to the inner headers of the skb. If the checksum is for
2532 * something else in the packet we need help.
2534 if (skb_checksum_start_offset(skb
) == skb_transport_offset(skb
)) {
2535 /* Non-encapsulated checksum */
2536 protocol
= eproto_to_ipproto(vlan_get_protocol(skb
));
2537 nhdr
= skb_network_header(skb
);
2538 *csum_encapped
= false;
2539 if (spec
->no_not_encapped
)
2541 } else if (skb
->encapsulation
&& spec
->encap_okay
&&
2542 skb_checksum_start_offset(skb
) ==
2543 skb_inner_transport_offset(skb
)) {
2544 /* Encapsulated checksum */
2545 *csum_encapped
= true;
2546 switch (skb
->inner_protocol_type
) {
2547 case ENCAP_TYPE_ETHER
:
2548 protocol
= eproto_to_ipproto(skb
->inner_protocol
);
2550 case ENCAP_TYPE_IPPROTO
:
2551 protocol
= skb
->inner_protocol
;
2554 nhdr
= skb_inner_network_header(skb
);
2561 if (!spec
->ipv4_okay
)
2564 ip_proto
= iph
->protocol
;
2565 if (iph
->ihl
!= 5 && !spec
->ip_options_okay
)
2569 if (!spec
->ipv6_okay
)
2571 if (spec
->no_encapped_ipv6
&& *csum_encapped
)
2574 nhdr
+= sizeof(*ipv6
);
2575 ip_proto
= ipv6
->nexthdr
;
2584 if (!spec
->tcp_okay
||
2585 skb
->csum_offset
!= offsetof(struct tcphdr
, check
))
2589 if (!spec
->udp_okay
||
2590 skb
->csum_offset
!= offsetof(struct udphdr
, check
))
2594 if (!spec
->sctp_okay
||
2595 skb
->csum_offset
!= offsetof(struct sctphdr
, checksum
))
2599 case NEXTHDR_ROUTING
:
2600 case NEXTHDR_DEST
: {
2603 if (protocol
!= IPPROTO_IPV6
|| !spec
->ext_hdrs_okay
)
2606 ip_proto
= opthdr
[0];
2607 nhdr
+= (opthdr
[1] + 1) << 3;
2609 goto ip_proto_again
;
2615 /* Passed the tests for offloading checksum */
2619 if (csum_help
&& !skb_shinfo(skb
)->gso_size
)
2620 skb_checksum_help(skb
);
2624 EXPORT_SYMBOL(__skb_csum_offload_chk
);
2626 __be16
skb_network_protocol(struct sk_buff
*skb
, int *depth
)
2628 __be16 type
= skb
->protocol
;
2630 /* Tunnel gso handlers can set protocol to ethernet. */
2631 if (type
== htons(ETH_P_TEB
)) {
2634 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2637 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2638 type
= eth
->h_proto
;
2641 return __vlan_get_protocol(skb
, type
, depth
);
2645 * skb_mac_gso_segment - mac layer segmentation handler.
2646 * @skb: buffer to segment
2647 * @features: features for the output path (see dev->features)
2649 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2650 netdev_features_t features
)
2652 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2653 struct packet_offload
*ptype
;
2654 int vlan_depth
= skb
->mac_len
;
2655 __be16 type
= skb_network_protocol(skb
, &vlan_depth
);
2657 if (unlikely(!type
))
2658 return ERR_PTR(-EINVAL
);
2660 __skb_pull(skb
, vlan_depth
);
2663 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2664 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2665 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2671 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2675 EXPORT_SYMBOL(skb_mac_gso_segment
);
2678 /* openvswitch calls this on rx path, so we need a different check.
2680 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2683 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2685 return skb
->ip_summed
== CHECKSUM_NONE
;
2689 * __skb_gso_segment - Perform segmentation on skb.
2690 * @skb: buffer to segment
2691 * @features: features for the output path (see dev->features)
2692 * @tx_path: whether it is called in TX path
2694 * This function segments the given skb and returns a list of segments.
2696 * It may return NULL if the skb requires no segmentation. This is
2697 * only possible when GSO is used for verifying header integrity.
2699 * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb.
2701 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2702 netdev_features_t features
, bool tx_path
)
2704 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2707 skb_warn_bad_offload(skb
);
2709 err
= skb_cow_head(skb
, 0);
2711 return ERR_PTR(err
);
2714 /* Only report GSO partial support if it will enable us to
2715 * support segmentation on this frame without needing additional
2718 if (features
& NETIF_F_GSO_PARTIAL
) {
2719 netdev_features_t partial_features
= NETIF_F_GSO_ROBUST
;
2720 struct net_device
*dev
= skb
->dev
;
2722 partial_features
|= dev
->features
& dev
->gso_partial_features
;
2723 if (!skb_gso_ok(skb
, features
| partial_features
))
2724 features
&= ~NETIF_F_GSO_PARTIAL
;
2727 BUILD_BUG_ON(SKB_SGO_CB_OFFSET
+
2728 sizeof(*SKB_GSO_CB(skb
)) > sizeof(skb
->cb
));
2730 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2731 SKB_GSO_CB(skb
)->encap_level
= 0;
2733 skb_reset_mac_header(skb
);
2734 skb_reset_mac_len(skb
);
2736 return skb_mac_gso_segment(skb
, features
);
2738 EXPORT_SYMBOL(__skb_gso_segment
);
2740 /* Take action when hardware reception checksum errors are detected. */
2742 void netdev_rx_csum_fault(struct net_device
*dev
)
2744 if (net_ratelimit()) {
2745 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2749 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2752 /* Actually, we should eliminate this check as soon as we know, that:
2753 * 1. IOMMU is present and allows to map all the memory.
2754 * 2. No high memory really exists on this machine.
2757 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2759 #ifdef CONFIG_HIGHMEM
2761 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2762 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2763 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2764 if (PageHighMem(skb_frag_page(frag
)))
2769 if (PCI_DMA_BUS_IS_PHYS
) {
2770 struct device
*pdev
= dev
->dev
.parent
;
2774 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2775 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2776 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2777 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2785 /* If MPLS offload request, verify we are testing hardware MPLS features
2786 * instead of standard features for the netdev.
2788 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2789 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2790 netdev_features_t features
,
2793 if (eth_p_mpls(type
))
2794 features
&= skb
->dev
->mpls_features
;
2799 static netdev_features_t
net_mpls_features(struct sk_buff
*skb
,
2800 netdev_features_t features
,
2807 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2808 netdev_features_t features
)
2813 type
= skb_network_protocol(skb
, &tmp
);
2814 features
= net_mpls_features(skb
, features
, type
);
2816 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2817 !can_checksum_protocol(features
, type
)) {
2818 features
&= ~NETIF_F_CSUM_MASK
;
2819 } else if (illegal_highdma(skb
->dev
, skb
)) {
2820 features
&= ~NETIF_F_SG
;
2826 netdev_features_t
passthru_features_check(struct sk_buff
*skb
,
2827 struct net_device
*dev
,
2828 netdev_features_t features
)
2832 EXPORT_SYMBOL(passthru_features_check
);
2834 static netdev_features_t
dflt_features_check(const struct sk_buff
*skb
,
2835 struct net_device
*dev
,
2836 netdev_features_t features
)
2838 return vlan_features_check(skb
, features
);
2841 static netdev_features_t
gso_features_check(const struct sk_buff
*skb
,
2842 struct net_device
*dev
,
2843 netdev_features_t features
)
2845 u16 gso_segs
= skb_shinfo(skb
)->gso_segs
;
2847 if (gso_segs
> dev
->gso_max_segs
)
2848 return features
& ~NETIF_F_GSO_MASK
;
2850 /* Support for GSO partial features requires software
2851 * intervention before we can actually process the packets
2852 * so we need to strip support for any partial features now
2853 * and we can pull them back in after we have partially
2854 * segmented the frame.
2856 if (!(skb_shinfo(skb
)->gso_type
& SKB_GSO_PARTIAL
))
2857 features
&= ~dev
->gso_partial_features
;
2859 /* Make sure to clear the IPv4 ID mangling feature if the
2860 * IPv4 header has the potential to be fragmented.
2862 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
) {
2863 struct iphdr
*iph
= skb
->encapsulation
?
2864 inner_ip_hdr(skb
) : ip_hdr(skb
);
2866 if (!(iph
->frag_off
& htons(IP_DF
)))
2867 features
&= ~NETIF_F_TSO_MANGLEID
;
2873 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2875 struct net_device
*dev
= skb
->dev
;
2876 netdev_features_t features
= dev
->features
;
2878 if (skb_is_gso(skb
))
2879 features
= gso_features_check(skb
, dev
, features
);
2881 /* If encapsulation offload request, verify we are testing
2882 * hardware encapsulation features instead of standard
2883 * features for the netdev
2885 if (skb
->encapsulation
)
2886 features
&= dev
->hw_enc_features
;
2888 if (skb_vlan_tagged(skb
))
2889 features
= netdev_intersect_features(features
,
2890 dev
->vlan_features
|
2891 NETIF_F_HW_VLAN_CTAG_TX
|
2892 NETIF_F_HW_VLAN_STAG_TX
);
2894 if (dev
->netdev_ops
->ndo_features_check
)
2895 features
&= dev
->netdev_ops
->ndo_features_check(skb
, dev
,
2898 features
&= dflt_features_check(skb
, dev
, features
);
2900 return harmonize_features(skb
, features
);
2902 EXPORT_SYMBOL(netif_skb_features
);
2904 static int xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
2905 struct netdev_queue
*txq
, bool more
)
2910 if (!list_empty(&ptype_all
) || !list_empty(&dev
->ptype_all
))
2911 dev_queue_xmit_nit(skb
, dev
);
2914 trace_net_dev_start_xmit(skb
, dev
);
2915 rc
= netdev_start_xmit(skb
, dev
, txq
, more
);
2916 trace_net_dev_xmit(skb
, rc
, dev
, len
);
2921 struct sk_buff
*dev_hard_start_xmit(struct sk_buff
*first
, struct net_device
*dev
,
2922 struct netdev_queue
*txq
, int *ret
)
2924 struct sk_buff
*skb
= first
;
2925 int rc
= NETDEV_TX_OK
;
2928 struct sk_buff
*next
= skb
->next
;
2931 rc
= xmit_one(skb
, dev
, txq
, next
!= NULL
);
2932 if (unlikely(!dev_xmit_complete(rc
))) {
2938 if (netif_xmit_stopped(txq
) && skb
) {
2939 rc
= NETDEV_TX_BUSY
;
2949 static struct sk_buff
*validate_xmit_vlan(struct sk_buff
*skb
,
2950 netdev_features_t features
)
2952 if (skb_vlan_tag_present(skb
) &&
2953 !vlan_hw_offload_capable(features
, skb
->vlan_proto
))
2954 skb
= __vlan_hwaccel_push_inside(skb
);
2958 static struct sk_buff
*validate_xmit_skb(struct sk_buff
*skb
, struct net_device
*dev
)
2960 netdev_features_t features
;
2965 features
= netif_skb_features(skb
);
2966 skb
= validate_xmit_vlan(skb
, features
);
2970 if (netif_needs_gso(skb
, features
)) {
2971 struct sk_buff
*segs
;
2973 segs
= skb_gso_segment(skb
, features
);
2981 if (skb_needs_linearize(skb
, features
) &&
2982 __skb_linearize(skb
))
2985 /* If packet is not checksummed and device does not
2986 * support checksumming for this protocol, complete
2987 * checksumming here.
2989 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2990 if (skb
->encapsulation
)
2991 skb_set_inner_transport_header(skb
,
2992 skb_checksum_start_offset(skb
));
2994 skb_set_transport_header(skb
,
2995 skb_checksum_start_offset(skb
));
2996 if (!(features
& NETIF_F_CSUM_MASK
) &&
2997 skb_checksum_help(skb
))
3010 struct sk_buff
*validate_xmit_skb_list(struct sk_buff
*skb
, struct net_device
*dev
)
3012 struct sk_buff
*next
, *head
= NULL
, *tail
;
3014 for (; skb
!= NULL
; skb
= next
) {
3018 /* in case skb wont be segmented, point to itself */
3021 skb
= validate_xmit_skb(skb
, dev
);
3029 /* If skb was segmented, skb->prev points to
3030 * the last segment. If not, it still contains skb.
3037 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
3039 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
3041 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
3043 /* To get more precise estimation of bytes sent on wire,
3044 * we add to pkt_len the headers size of all segments
3046 if (shinfo
->gso_size
) {
3047 unsigned int hdr_len
;
3048 u16 gso_segs
= shinfo
->gso_segs
;
3050 /* mac layer + network layer */
3051 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
3053 /* + transport layer */
3054 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
3055 hdr_len
+= tcp_hdrlen(skb
);
3057 hdr_len
+= sizeof(struct udphdr
);
3059 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
3060 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
3063 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
3067 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
3068 struct net_device
*dev
,
3069 struct netdev_queue
*txq
)
3071 spinlock_t
*root_lock
= qdisc_lock(q
);
3075 qdisc_calculate_pkt_len(skb
, q
);
3077 * Heuristic to force contended enqueues to serialize on a
3078 * separate lock before trying to get qdisc main lock.
3079 * This permits __QDISC___STATE_RUNNING owner to get the lock more
3080 * often and dequeue packets faster.
3082 contended
= qdisc_is_running(q
);
3083 if (unlikely(contended
))
3084 spin_lock(&q
->busylock
);
3086 spin_lock(root_lock
);
3087 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
3090 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
3091 qdisc_run_begin(q
)) {
3093 * This is a work-conserving queue; there are no old skbs
3094 * waiting to be sent out; and the qdisc is not running -
3095 * xmit the skb directly.
3098 qdisc_bstats_update(q
, skb
);
3100 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
, true)) {
3101 if (unlikely(contended
)) {
3102 spin_unlock(&q
->busylock
);
3109 rc
= NET_XMIT_SUCCESS
;
3111 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
3112 if (qdisc_run_begin(q
)) {
3113 if (unlikely(contended
)) {
3114 spin_unlock(&q
->busylock
);
3120 spin_unlock(root_lock
);
3121 if (unlikely(contended
))
3122 spin_unlock(&q
->busylock
);
3126 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
3127 static void skb_update_prio(struct sk_buff
*skb
)
3129 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
3131 if (!skb
->priority
&& skb
->sk
&& map
) {
3132 unsigned int prioidx
=
3133 sock_cgroup_prioidx(&skb
->sk
->sk_cgrp_data
);
3135 if (prioidx
< map
->priomap_len
)
3136 skb
->priority
= map
->priomap
[prioidx
];
3140 #define skb_update_prio(skb)
3143 DEFINE_PER_CPU(int, xmit_recursion
);
3144 EXPORT_SYMBOL(xmit_recursion
);
3146 #define RECURSION_LIMIT 10
3149 * dev_loopback_xmit - loop back @skb
3150 * @net: network namespace this loopback is happening in
3151 * @sk: sk needed to be a netfilter okfn
3152 * @skb: buffer to transmit
3154 int dev_loopback_xmit(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
3156 skb_reset_mac_header(skb
);
3157 __skb_pull(skb
, skb_network_offset(skb
));
3158 skb
->pkt_type
= PACKET_LOOPBACK
;
3159 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
3160 WARN_ON(!skb_dst(skb
));
3165 EXPORT_SYMBOL(dev_loopback_xmit
);
3167 #ifdef CONFIG_NET_EGRESS
3168 static struct sk_buff
*
3169 sch_handle_egress(struct sk_buff
*skb
, int *ret
, struct net_device
*dev
)
3171 struct tcf_proto
*cl
= rcu_dereference_bh(dev
->egress_cl_list
);
3172 struct tcf_result cl_res
;
3177 /* skb->tc_verd and qdisc_skb_cb(skb)->pkt_len were already set
3178 * earlier by the caller.
3180 qdisc_bstats_cpu_update(cl
->q
, skb
);
3182 switch (tc_classify(skb
, cl
, &cl_res
, false)) {
3184 case TC_ACT_RECLASSIFY
:
3185 skb
->tc_index
= TC_H_MIN(cl_res
.classid
);
3188 qdisc_qstats_cpu_drop(cl
->q
);
3189 *ret
= NET_XMIT_DROP
;
3193 *ret
= NET_XMIT_SUCCESS
;
3197 case TC_ACT_REDIRECT
:
3198 /* No need to push/pop skb's mac_header here on egress! */
3199 skb_do_redirect(skb
);
3200 *ret
= NET_XMIT_SUCCESS
;
3208 #endif /* CONFIG_NET_EGRESS */
3210 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
3213 struct xps_dev_maps
*dev_maps
;
3214 struct xps_map
*map
;
3215 int queue_index
= -1;
3218 dev_maps
= rcu_dereference(dev
->xps_maps
);
3220 map
= rcu_dereference(
3221 dev_maps
->cpu_map
[skb
->sender_cpu
- 1]);
3224 queue_index
= map
->queues
[0];
3226 queue_index
= map
->queues
[reciprocal_scale(skb_get_hash(skb
),
3228 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
3240 static u16
__netdev_pick_tx(struct net_device
*dev
, struct sk_buff
*skb
)
3242 struct sock
*sk
= skb
->sk
;
3243 int queue_index
= sk_tx_queue_get(sk
);
3245 if (queue_index
< 0 || skb
->ooo_okay
||
3246 queue_index
>= dev
->real_num_tx_queues
) {
3247 int new_index
= get_xps_queue(dev
, skb
);
3249 new_index
= skb_tx_hash(dev
, skb
);
3251 if (queue_index
!= new_index
&& sk
&&
3253 rcu_access_pointer(sk
->sk_dst_cache
))
3254 sk_tx_queue_set(sk
, new_index
);
3256 queue_index
= new_index
;
3262 struct netdev_queue
*netdev_pick_tx(struct net_device
*dev
,
3263 struct sk_buff
*skb
,
3266 int queue_index
= 0;
3269 u32 sender_cpu
= skb
->sender_cpu
- 1;
3271 if (sender_cpu
>= (u32
)NR_CPUS
)
3272 skb
->sender_cpu
= raw_smp_processor_id() + 1;
3275 if (dev
->real_num_tx_queues
!= 1) {
3276 const struct net_device_ops
*ops
= dev
->netdev_ops
;
3277 if (ops
->ndo_select_queue
)
3278 queue_index
= ops
->ndo_select_queue(dev
, skb
, accel_priv
,
3281 queue_index
= __netdev_pick_tx(dev
, skb
);
3284 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
3287 skb_set_queue_mapping(skb
, queue_index
);
3288 return netdev_get_tx_queue(dev
, queue_index
);
3292 * __dev_queue_xmit - transmit a buffer
3293 * @skb: buffer to transmit
3294 * @accel_priv: private data used for L2 forwarding offload
3296 * Queue a buffer for transmission to a network device. The caller must
3297 * have set the device and priority and built the buffer before calling
3298 * this function. The function can be called from an interrupt.
3300 * A negative errno code is returned on a failure. A success does not
3301 * guarantee the frame will be transmitted as it may be dropped due
3302 * to congestion or traffic shaping.
3304 * -----------------------------------------------------------------------------------
3305 * I notice this method can also return errors from the queue disciplines,
3306 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3309 * Regardless of the return value, the skb is consumed, so it is currently
3310 * difficult to retry a send to this method. (You can bump the ref count
3311 * before sending to hold a reference for retry if you are careful.)
3313 * When calling this method, interrupts MUST be enabled. This is because
3314 * the BH enable code must have IRQs enabled so that it will not deadlock.
3317 static int __dev_queue_xmit(struct sk_buff
*skb
, void *accel_priv
)
3319 struct net_device
*dev
= skb
->dev
;
3320 struct netdev_queue
*txq
;
3324 skb_reset_mac_header(skb
);
3326 if (unlikely(skb_shinfo(skb
)->tx_flags
& SKBTX_SCHED_TSTAMP
))
3327 __skb_tstamp_tx(skb
, NULL
, skb
->sk
, SCM_TSTAMP_SCHED
);
3329 /* Disable soft irqs for various locks below. Also
3330 * stops preemption for RCU.
3334 skb_update_prio(skb
);
3336 qdisc_pkt_len_init(skb
);
3337 #ifdef CONFIG_NET_CLS_ACT
3338 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
3339 # ifdef CONFIG_NET_EGRESS
3340 if (static_key_false(&egress_needed
)) {
3341 skb
= sch_handle_egress(skb
, &rc
, dev
);
3347 /* If device/qdisc don't need skb->dst, release it right now while
3348 * its hot in this cpu cache.
3350 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
3355 #ifdef CONFIG_NET_SWITCHDEV
3356 /* Don't forward if offload device already forwarded */
3357 if (skb
->offload_fwd_mark
&&
3358 skb
->offload_fwd_mark
== dev
->offload_fwd_mark
) {
3360 rc
= NET_XMIT_SUCCESS
;
3365 txq
= netdev_pick_tx(dev
, skb
, accel_priv
);
3366 q
= rcu_dereference_bh(txq
->qdisc
);
3368 trace_net_dev_queue(skb
);
3370 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
3374 /* The device has no queue. Common case for software devices:
3375 loopback, all the sorts of tunnels...
3377 Really, it is unlikely that netif_tx_lock protection is necessary
3378 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3380 However, it is possible, that they rely on protection
3383 Check this and shot the lock. It is not prone from deadlocks.
3384 Either shot noqueue qdisc, it is even simpler 8)
3386 if (dev
->flags
& IFF_UP
) {
3387 int cpu
= smp_processor_id(); /* ok because BHs are off */
3389 if (txq
->xmit_lock_owner
!= cpu
) {
3391 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
3392 goto recursion_alert
;
3394 skb
= validate_xmit_skb(skb
, dev
);
3398 HARD_TX_LOCK(dev
, txq
, cpu
);
3400 if (!netif_xmit_stopped(txq
)) {
3401 __this_cpu_inc(xmit_recursion
);
3402 skb
= dev_hard_start_xmit(skb
, dev
, txq
, &rc
);
3403 __this_cpu_dec(xmit_recursion
);
3404 if (dev_xmit_complete(rc
)) {
3405 HARD_TX_UNLOCK(dev
, txq
);
3409 HARD_TX_UNLOCK(dev
, txq
);
3410 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3413 /* Recursion is detected! It is possible,
3417 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3424 rcu_read_unlock_bh();
3426 atomic_long_inc(&dev
->tx_dropped
);
3427 kfree_skb_list(skb
);
3430 rcu_read_unlock_bh();
3434 int dev_queue_xmit(struct sk_buff
*skb
)
3436 return __dev_queue_xmit(skb
, NULL
);
3438 EXPORT_SYMBOL(dev_queue_xmit
);
3440 int dev_queue_xmit_accel(struct sk_buff
*skb
, void *accel_priv
)
3442 return __dev_queue_xmit(skb
, accel_priv
);
3444 EXPORT_SYMBOL(dev_queue_xmit_accel
);
3447 /*=======================================================================
3449 =======================================================================*/
3451 int netdev_max_backlog __read_mostly
= 1000;
3452 EXPORT_SYMBOL(netdev_max_backlog
);
3454 int netdev_tstamp_prequeue __read_mostly
= 1;
3455 int netdev_budget __read_mostly
= 300;
3456 int weight_p __read_mostly
= 64; /* old backlog weight */
3458 /* Called with irq disabled */
3459 static inline void ____napi_schedule(struct softnet_data
*sd
,
3460 struct napi_struct
*napi
)
3462 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
3463 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3468 /* One global table that all flow-based protocols share. */
3469 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
3470 EXPORT_SYMBOL(rps_sock_flow_table
);
3471 u32 rps_cpu_mask __read_mostly
;
3472 EXPORT_SYMBOL(rps_cpu_mask
);
3474 struct static_key rps_needed __read_mostly
;
3476 static struct rps_dev_flow
*
3477 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3478 struct rps_dev_flow
*rflow
, u16 next_cpu
)
3480 if (next_cpu
< nr_cpu_ids
) {
3481 #ifdef CONFIG_RFS_ACCEL
3482 struct netdev_rx_queue
*rxqueue
;
3483 struct rps_dev_flow_table
*flow_table
;
3484 struct rps_dev_flow
*old_rflow
;
3489 /* Should we steer this flow to a different hardware queue? */
3490 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
3491 !(dev
->features
& NETIF_F_NTUPLE
))
3493 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
3494 if (rxq_index
== skb_get_rx_queue(skb
))
3497 rxqueue
= dev
->_rx
+ rxq_index
;
3498 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3501 flow_id
= skb_get_hash(skb
) & flow_table
->mask
;
3502 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
3503 rxq_index
, flow_id
);
3507 rflow
= &flow_table
->flows
[flow_id
];
3509 if (old_rflow
->filter
== rflow
->filter
)
3510 old_rflow
->filter
= RPS_NO_FILTER
;
3514 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
3517 rflow
->cpu
= next_cpu
;
3522 * get_rps_cpu is called from netif_receive_skb and returns the target
3523 * CPU from the RPS map of the receiving queue for a given skb.
3524 * rcu_read_lock must be held on entry.
3526 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
3527 struct rps_dev_flow
**rflowp
)
3529 const struct rps_sock_flow_table
*sock_flow_table
;
3530 struct netdev_rx_queue
*rxqueue
= dev
->_rx
;
3531 struct rps_dev_flow_table
*flow_table
;
3532 struct rps_map
*map
;
3537 if (skb_rx_queue_recorded(skb
)) {
3538 u16 index
= skb_get_rx_queue(skb
);
3540 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
3541 WARN_ONCE(dev
->real_num_rx_queues
> 1,
3542 "%s received packet on queue %u, but number "
3543 "of RX queues is %u\n",
3544 dev
->name
, index
, dev
->real_num_rx_queues
);
3550 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3552 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3553 map
= rcu_dereference(rxqueue
->rps_map
);
3554 if (!flow_table
&& !map
)
3557 skb_reset_network_header(skb
);
3558 hash
= skb_get_hash(skb
);
3562 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3563 if (flow_table
&& sock_flow_table
) {
3564 struct rps_dev_flow
*rflow
;
3568 /* First check into global flow table if there is a match */
3569 ident
= sock_flow_table
->ents
[hash
& sock_flow_table
->mask
];
3570 if ((ident
^ hash
) & ~rps_cpu_mask
)
3573 next_cpu
= ident
& rps_cpu_mask
;
3575 /* OK, now we know there is a match,
3576 * we can look at the local (per receive queue) flow table
3578 rflow
= &flow_table
->flows
[hash
& flow_table
->mask
];
3582 * If the desired CPU (where last recvmsg was done) is
3583 * different from current CPU (one in the rx-queue flow
3584 * table entry), switch if one of the following holds:
3585 * - Current CPU is unset (>= nr_cpu_ids).
3586 * - Current CPU is offline.
3587 * - The current CPU's queue tail has advanced beyond the
3588 * last packet that was enqueued using this table entry.
3589 * This guarantees that all previous packets for the flow
3590 * have been dequeued, thus preserving in order delivery.
3592 if (unlikely(tcpu
!= next_cpu
) &&
3593 (tcpu
>= nr_cpu_ids
|| !cpu_online(tcpu
) ||
3594 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3595 rflow
->last_qtail
)) >= 0)) {
3597 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3600 if (tcpu
< nr_cpu_ids
&& cpu_online(tcpu
)) {
3610 tcpu
= map
->cpus
[reciprocal_scale(hash
, map
->len
)];
3611 if (cpu_online(tcpu
)) {
3621 #ifdef CONFIG_RFS_ACCEL
3624 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3625 * @dev: Device on which the filter was set
3626 * @rxq_index: RX queue index
3627 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3628 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3630 * Drivers that implement ndo_rx_flow_steer() should periodically call
3631 * this function for each installed filter and remove the filters for
3632 * which it returns %true.
3634 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3635 u32 flow_id
, u16 filter_id
)
3637 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3638 struct rps_dev_flow_table
*flow_table
;
3639 struct rps_dev_flow
*rflow
;
3644 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3645 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3646 rflow
= &flow_table
->flows
[flow_id
];
3647 cpu
= ACCESS_ONCE(rflow
->cpu
);
3648 if (rflow
->filter
== filter_id
&& cpu
< nr_cpu_ids
&&
3649 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3650 rflow
->last_qtail
) <
3651 (int)(10 * flow_table
->mask
)))
3657 EXPORT_SYMBOL(rps_may_expire_flow
);
3659 #endif /* CONFIG_RFS_ACCEL */
3661 /* Called from hardirq (IPI) context */
3662 static void rps_trigger_softirq(void *data
)
3664 struct softnet_data
*sd
= data
;
3666 ____napi_schedule(sd
, &sd
->backlog
);
3670 #endif /* CONFIG_RPS */
3673 * Check if this softnet_data structure is another cpu one
3674 * If yes, queue it to our IPI list and return 1
3677 static int rps_ipi_queued(struct softnet_data
*sd
)
3680 struct softnet_data
*mysd
= this_cpu_ptr(&softnet_data
);
3683 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3684 mysd
->rps_ipi_list
= sd
;
3686 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3689 #endif /* CONFIG_RPS */
3693 #ifdef CONFIG_NET_FLOW_LIMIT
3694 int netdev_flow_limit_table_len __read_mostly
= (1 << 12);
3697 static bool skb_flow_limit(struct sk_buff
*skb
, unsigned int qlen
)
3699 #ifdef CONFIG_NET_FLOW_LIMIT
3700 struct sd_flow_limit
*fl
;
3701 struct softnet_data
*sd
;
3702 unsigned int old_flow
, new_flow
;
3704 if (qlen
< (netdev_max_backlog
>> 1))
3707 sd
= this_cpu_ptr(&softnet_data
);
3710 fl
= rcu_dereference(sd
->flow_limit
);
3712 new_flow
= skb_get_hash(skb
) & (fl
->num_buckets
- 1);
3713 old_flow
= fl
->history
[fl
->history_head
];
3714 fl
->history
[fl
->history_head
] = new_flow
;
3717 fl
->history_head
&= FLOW_LIMIT_HISTORY
- 1;
3719 if (likely(fl
->buckets
[old_flow
]))
3720 fl
->buckets
[old_flow
]--;
3722 if (++fl
->buckets
[new_flow
] > (FLOW_LIMIT_HISTORY
>> 1)) {
3734 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3735 * queue (may be a remote CPU queue).
3737 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3738 unsigned int *qtail
)
3740 struct softnet_data
*sd
;
3741 unsigned long flags
;
3744 sd
= &per_cpu(softnet_data
, cpu
);
3746 local_irq_save(flags
);
3749 if (!netif_running(skb
->dev
))
3751 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3752 if (qlen
<= netdev_max_backlog
&& !skb_flow_limit(skb
, qlen
)) {
3755 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3756 input_queue_tail_incr_save(sd
, qtail
);
3758 local_irq_restore(flags
);
3759 return NET_RX_SUCCESS
;
3762 /* Schedule NAPI for backlog device
3763 * We can use non atomic operation since we own the queue lock
3765 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3766 if (!rps_ipi_queued(sd
))
3767 ____napi_schedule(sd
, &sd
->backlog
);
3776 local_irq_restore(flags
);
3778 atomic_long_inc(&skb
->dev
->rx_dropped
);
3783 static int netif_rx_internal(struct sk_buff
*skb
)
3787 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3789 trace_netif_rx(skb
);
3791 if (static_key_false(&rps_needed
)) {
3792 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3798 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3800 cpu
= smp_processor_id();
3802 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3810 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3817 * netif_rx - post buffer to the network code
3818 * @skb: buffer to post
3820 * This function receives a packet from a device driver and queues it for
3821 * the upper (protocol) levels to process. It always succeeds. The buffer
3822 * may be dropped during processing for congestion control or by the
3826 * NET_RX_SUCCESS (no congestion)
3827 * NET_RX_DROP (packet was dropped)
3831 int netif_rx(struct sk_buff
*skb
)
3833 trace_netif_rx_entry(skb
);
3835 return netif_rx_internal(skb
);
3837 EXPORT_SYMBOL(netif_rx
);
3839 int netif_rx_ni(struct sk_buff
*skb
)
3843 trace_netif_rx_ni_entry(skb
);
3846 err
= netif_rx_internal(skb
);
3847 if (local_softirq_pending())
3853 EXPORT_SYMBOL(netif_rx_ni
);
3855 static void net_tx_action(struct softirq_action
*h
)
3857 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
3859 if (sd
->completion_queue
) {
3860 struct sk_buff
*clist
;
3862 local_irq_disable();
3863 clist
= sd
->completion_queue
;
3864 sd
->completion_queue
= NULL
;
3868 struct sk_buff
*skb
= clist
;
3869 clist
= clist
->next
;
3871 WARN_ON(atomic_read(&skb
->users
));
3872 if (likely(get_kfree_skb_cb(skb
)->reason
== SKB_REASON_CONSUMED
))
3873 trace_consume_skb(skb
);
3875 trace_kfree_skb(skb
, net_tx_action
);
3877 if (skb
->fclone
!= SKB_FCLONE_UNAVAILABLE
)
3880 __kfree_skb_defer(skb
);
3883 __kfree_skb_flush();
3886 if (sd
->output_queue
) {
3889 local_irq_disable();
3890 head
= sd
->output_queue
;
3891 sd
->output_queue
= NULL
;
3892 sd
->output_queue_tailp
= &sd
->output_queue
;
3896 struct Qdisc
*q
= head
;
3897 spinlock_t
*root_lock
;
3899 head
= head
->next_sched
;
3901 root_lock
= qdisc_lock(q
);
3902 if (spin_trylock(root_lock
)) {
3903 smp_mb__before_atomic();
3904 clear_bit(__QDISC_STATE_SCHED
,
3907 spin_unlock(root_lock
);
3909 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3911 __netif_reschedule(q
);
3913 smp_mb__before_atomic();
3914 clear_bit(__QDISC_STATE_SCHED
,
3922 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3923 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3924 /* This hook is defined here for ATM LANE */
3925 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3926 unsigned char *addr
) __read_mostly
;
3927 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3930 static inline struct sk_buff
*
3931 sch_handle_ingress(struct sk_buff
*skb
, struct packet_type
**pt_prev
, int *ret
,
3932 struct net_device
*orig_dev
)
3934 #ifdef CONFIG_NET_CLS_ACT
3935 struct tcf_proto
*cl
= rcu_dereference_bh(skb
->dev
->ingress_cl_list
);
3936 struct tcf_result cl_res
;
3938 /* If there's at least one ingress present somewhere (so
3939 * we get here via enabled static key), remaining devices
3940 * that are not configured with an ingress qdisc will bail
3946 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3950 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
3951 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3952 qdisc_bstats_cpu_update(cl
->q
, skb
);
3954 switch (tc_classify(skb
, cl
, &cl_res
, false)) {
3956 case TC_ACT_RECLASSIFY
:
3957 skb
->tc_index
= TC_H_MIN(cl_res
.classid
);
3960 qdisc_qstats_cpu_drop(cl
->q
);
3965 case TC_ACT_REDIRECT
:
3966 /* skb_mac_header check was done by cls/act_bpf, so
3967 * we can safely push the L2 header back before
3968 * redirecting to another netdev
3970 __skb_push(skb
, skb
->mac_len
);
3971 skb_do_redirect(skb
);
3976 #endif /* CONFIG_NET_CLS_ACT */
3981 * netdev_rx_handler_register - register receive handler
3982 * @dev: device to register a handler for
3983 * @rx_handler: receive handler to register
3984 * @rx_handler_data: data pointer that is used by rx handler
3986 * Register a receive handler for a device. This handler will then be
3987 * called from __netif_receive_skb. A negative errno code is returned
3990 * The caller must hold the rtnl_mutex.
3992 * For a general description of rx_handler, see enum rx_handler_result.
3994 int netdev_rx_handler_register(struct net_device
*dev
,
3995 rx_handler_func_t
*rx_handler
,
3996 void *rx_handler_data
)
4000 if (dev
->rx_handler
)
4003 /* Note: rx_handler_data must be set before rx_handler */
4004 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
4005 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
4009 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
4012 * netdev_rx_handler_unregister - unregister receive handler
4013 * @dev: device to unregister a handler from
4015 * Unregister a receive handler from a device.
4017 * The caller must hold the rtnl_mutex.
4019 void netdev_rx_handler_unregister(struct net_device
*dev
)
4023 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
4024 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
4025 * section has a guarantee to see a non NULL rx_handler_data
4029 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
4031 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
4034 * Limit the use of PFMEMALLOC reserves to those protocols that implement
4035 * the special handling of PFMEMALLOC skbs.
4037 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
4039 switch (skb
->protocol
) {
4040 case htons(ETH_P_ARP
):
4041 case htons(ETH_P_IP
):
4042 case htons(ETH_P_IPV6
):
4043 case htons(ETH_P_8021Q
):
4044 case htons(ETH_P_8021AD
):
4051 static inline int nf_ingress(struct sk_buff
*skb
, struct packet_type
**pt_prev
,
4052 int *ret
, struct net_device
*orig_dev
)
4054 #ifdef CONFIG_NETFILTER_INGRESS
4055 if (nf_hook_ingress_active(skb
)) {
4057 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
4061 return nf_hook_ingress(skb
);
4063 #endif /* CONFIG_NETFILTER_INGRESS */
4067 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
4069 struct packet_type
*ptype
, *pt_prev
;
4070 rx_handler_func_t
*rx_handler
;
4071 struct net_device
*orig_dev
;
4072 bool deliver_exact
= false;
4073 int ret
= NET_RX_DROP
;
4076 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
4078 trace_netif_receive_skb(skb
);
4080 orig_dev
= skb
->dev
;
4082 skb_reset_network_header(skb
);
4083 if (!skb_transport_header_was_set(skb
))
4084 skb_reset_transport_header(skb
);
4085 skb_reset_mac_len(skb
);
4090 skb
->skb_iif
= skb
->dev
->ifindex
;
4092 __this_cpu_inc(softnet_data
.processed
);
4094 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
4095 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
4096 skb
= skb_vlan_untag(skb
);
4101 #ifdef CONFIG_NET_CLS_ACT
4102 if (skb
->tc_verd
& TC_NCLS
) {
4103 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
4111 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
4113 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4117 list_for_each_entry_rcu(ptype
, &skb
->dev
->ptype_all
, list
) {
4119 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4124 #ifdef CONFIG_NET_INGRESS
4125 if (static_key_false(&ingress_needed
)) {
4126 skb
= sch_handle_ingress(skb
, &pt_prev
, &ret
, orig_dev
);
4130 if (nf_ingress(skb
, &pt_prev
, &ret
, orig_dev
) < 0)
4134 #ifdef CONFIG_NET_CLS_ACT
4138 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
4141 if (skb_vlan_tag_present(skb
)) {
4143 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4146 if (vlan_do_receive(&skb
))
4148 else if (unlikely(!skb
))
4152 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
4155 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
4158 switch (rx_handler(&skb
)) {
4159 case RX_HANDLER_CONSUMED
:
4160 ret
= NET_RX_SUCCESS
;
4162 case RX_HANDLER_ANOTHER
:
4164 case RX_HANDLER_EXACT
:
4165 deliver_exact
= true;
4166 case RX_HANDLER_PASS
:
4173 if (unlikely(skb_vlan_tag_present(skb
))) {
4174 if (skb_vlan_tag_get_id(skb
))
4175 skb
->pkt_type
= PACKET_OTHERHOST
;
4176 /* Note: we might in the future use prio bits
4177 * and set skb->priority like in vlan_do_receive()
4178 * For the time being, just ignore Priority Code Point
4183 type
= skb
->protocol
;
4185 /* deliver only exact match when indicated */
4186 if (likely(!deliver_exact
)) {
4187 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
4188 &ptype_base
[ntohs(type
) &
4192 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
4193 &orig_dev
->ptype_specific
);
4195 if (unlikely(skb
->dev
!= orig_dev
)) {
4196 deliver_ptype_list_skb(skb
, &pt_prev
, orig_dev
, type
,
4197 &skb
->dev
->ptype_specific
);
4201 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
4204 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
4208 atomic_long_inc(&skb
->dev
->rx_dropped
);
4210 atomic_long_inc(&skb
->dev
->rx_nohandler
);
4212 /* Jamal, now you will not able to escape explaining
4213 * me how you were going to use this. :-)
4222 static int __netif_receive_skb(struct sk_buff
*skb
)
4226 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
4227 unsigned long pflags
= current
->flags
;
4230 * PFMEMALLOC skbs are special, they should
4231 * - be delivered to SOCK_MEMALLOC sockets only
4232 * - stay away from userspace
4233 * - have bounded memory usage
4235 * Use PF_MEMALLOC as this saves us from propagating the allocation
4236 * context down to all allocation sites.
4238 current
->flags
|= PF_MEMALLOC
;
4239 ret
= __netif_receive_skb_core(skb
, true);
4240 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
4242 ret
= __netif_receive_skb_core(skb
, false);
4247 static int netif_receive_skb_internal(struct sk_buff
*skb
)
4251 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
4253 if (skb_defer_rx_timestamp(skb
))
4254 return NET_RX_SUCCESS
;
4259 if (static_key_false(&rps_needed
)) {
4260 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
4261 int cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
4264 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
4270 ret
= __netif_receive_skb(skb
);
4276 * netif_receive_skb - process receive buffer from network
4277 * @skb: buffer to process
4279 * netif_receive_skb() is the main receive data processing function.
4280 * It always succeeds. The buffer may be dropped during processing
4281 * for congestion control or by the protocol layers.
4283 * This function may only be called from softirq context and interrupts
4284 * should be enabled.
4286 * Return values (usually ignored):
4287 * NET_RX_SUCCESS: no congestion
4288 * NET_RX_DROP: packet was dropped
4290 int netif_receive_skb(struct sk_buff
*skb
)
4292 trace_netif_receive_skb_entry(skb
);
4294 return netif_receive_skb_internal(skb
);
4296 EXPORT_SYMBOL(netif_receive_skb
);
4298 /* Network device is going away, flush any packets still pending
4299 * Called with irqs disabled.
4301 static void flush_backlog(void *arg
)
4303 struct net_device
*dev
= arg
;
4304 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
4305 struct sk_buff
*skb
, *tmp
;
4308 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
4309 if (skb
->dev
== dev
) {
4310 __skb_unlink(skb
, &sd
->input_pkt_queue
);
4312 input_queue_head_incr(sd
);
4317 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
4318 if (skb
->dev
== dev
) {
4319 __skb_unlink(skb
, &sd
->process_queue
);
4321 input_queue_head_incr(sd
);
4326 static int napi_gro_complete(struct sk_buff
*skb
)
4328 struct packet_offload
*ptype
;
4329 __be16 type
= skb
->protocol
;
4330 struct list_head
*head
= &offload_base
;
4333 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
4335 if (NAPI_GRO_CB(skb
)->count
== 1) {
4336 skb_shinfo(skb
)->gso_size
= 0;
4341 list_for_each_entry_rcu(ptype
, head
, list
) {
4342 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4345 err
= ptype
->callbacks
.gro_complete(skb
, 0);
4351 WARN_ON(&ptype
->list
== head
);
4353 return NET_RX_SUCCESS
;
4357 return netif_receive_skb_internal(skb
);
4360 /* napi->gro_list contains packets ordered by age.
4361 * youngest packets at the head of it.
4362 * Complete skbs in reverse order to reduce latencies.
4364 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
4366 struct sk_buff
*skb
, *prev
= NULL
;
4368 /* scan list and build reverse chain */
4369 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
4374 for (skb
= prev
; skb
; skb
= prev
) {
4377 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
4381 napi_gro_complete(skb
);
4385 napi
->gro_list
= NULL
;
4387 EXPORT_SYMBOL(napi_gro_flush
);
4389 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
4392 unsigned int maclen
= skb
->dev
->hard_header_len
;
4393 u32 hash
= skb_get_hash_raw(skb
);
4395 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
4396 unsigned long diffs
;
4398 NAPI_GRO_CB(p
)->flush
= 0;
4400 if (hash
!= skb_get_hash_raw(p
)) {
4401 NAPI_GRO_CB(p
)->same_flow
= 0;
4405 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
4406 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
4407 diffs
|= skb_metadata_dst_cmp(p
, skb
);
4408 if (maclen
== ETH_HLEN
)
4409 diffs
|= compare_ether_header(skb_mac_header(p
),
4410 skb_mac_header(skb
));
4412 diffs
= memcmp(skb_mac_header(p
),
4413 skb_mac_header(skb
),
4415 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
4419 static void skb_gro_reset_offset(struct sk_buff
*skb
)
4421 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4422 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
4424 NAPI_GRO_CB(skb
)->data_offset
= 0;
4425 NAPI_GRO_CB(skb
)->frag0
= NULL
;
4426 NAPI_GRO_CB(skb
)->frag0_len
= 0;
4428 if (skb_mac_header(skb
) == skb_tail_pointer(skb
) &&
4430 !PageHighMem(skb_frag_page(frag0
))) {
4431 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
4432 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
4436 static void gro_pull_from_frag0(struct sk_buff
*skb
, int grow
)
4438 struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
4440 BUG_ON(skb
->end
- skb
->tail
< grow
);
4442 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
4444 skb
->data_len
-= grow
;
4447 pinfo
->frags
[0].page_offset
+= grow
;
4448 skb_frag_size_sub(&pinfo
->frags
[0], grow
);
4450 if (unlikely(!skb_frag_size(&pinfo
->frags
[0]))) {
4451 skb_frag_unref(skb
, 0);
4452 memmove(pinfo
->frags
, pinfo
->frags
+ 1,
4453 --pinfo
->nr_frags
* sizeof(pinfo
->frags
[0]));
4457 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4459 struct sk_buff
**pp
= NULL
;
4460 struct packet_offload
*ptype
;
4461 __be16 type
= skb
->protocol
;
4462 struct list_head
*head
= &offload_base
;
4464 enum gro_result ret
;
4467 if (!(skb
->dev
->features
& NETIF_F_GRO
))
4470 if (skb_is_gso(skb
) || skb_has_frag_list(skb
) || skb
->csum_bad
)
4473 gro_list_prepare(napi
, skb
);
4476 list_for_each_entry_rcu(ptype
, head
, list
) {
4477 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4480 skb_set_network_header(skb
, skb_gro_offset(skb
));
4481 skb_reset_mac_len(skb
);
4482 NAPI_GRO_CB(skb
)->same_flow
= 0;
4483 NAPI_GRO_CB(skb
)->flush
= 0;
4484 NAPI_GRO_CB(skb
)->free
= 0;
4485 NAPI_GRO_CB(skb
)->encap_mark
= 0;
4486 NAPI_GRO_CB(skb
)->is_fou
= 0;
4487 NAPI_GRO_CB(skb
)->is_atomic
= 1;
4488 NAPI_GRO_CB(skb
)->gro_remcsum_start
= 0;
4490 /* Setup for GRO checksum validation */
4491 switch (skb
->ip_summed
) {
4492 case CHECKSUM_COMPLETE
:
4493 NAPI_GRO_CB(skb
)->csum
= skb
->csum
;
4494 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4495 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4497 case CHECKSUM_UNNECESSARY
:
4498 NAPI_GRO_CB(skb
)->csum_cnt
= skb
->csum_level
+ 1;
4499 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4502 NAPI_GRO_CB(skb
)->csum_cnt
= 0;
4503 NAPI_GRO_CB(skb
)->csum_valid
= 0;
4506 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
4511 if (&ptype
->list
== head
)
4514 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
4515 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
4518 struct sk_buff
*nskb
= *pp
;
4522 napi_gro_complete(nskb
);
4529 if (NAPI_GRO_CB(skb
)->flush
)
4532 if (unlikely(napi
->gro_count
>= MAX_GRO_SKBS
)) {
4533 struct sk_buff
*nskb
= napi
->gro_list
;
4535 /* locate the end of the list to select the 'oldest' flow */
4536 while (nskb
->next
) {
4542 napi_gro_complete(nskb
);
4546 NAPI_GRO_CB(skb
)->count
= 1;
4547 NAPI_GRO_CB(skb
)->age
= jiffies
;
4548 NAPI_GRO_CB(skb
)->last
= skb
;
4549 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
4550 skb
->next
= napi
->gro_list
;
4551 napi
->gro_list
= skb
;
4555 grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
4557 gro_pull_from_frag0(skb
, grow
);
4566 struct packet_offload
*gro_find_receive_by_type(__be16 type
)
4568 struct list_head
*offload_head
= &offload_base
;
4569 struct packet_offload
*ptype
;
4571 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4572 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
4578 EXPORT_SYMBOL(gro_find_receive_by_type
);
4580 struct packet_offload
*gro_find_complete_by_type(__be16 type
)
4582 struct list_head
*offload_head
= &offload_base
;
4583 struct packet_offload
*ptype
;
4585 list_for_each_entry_rcu(ptype
, offload_head
, list
) {
4586 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
4592 EXPORT_SYMBOL(gro_find_complete_by_type
);
4594 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
4598 if (netif_receive_skb_internal(skb
))
4606 case GRO_MERGED_FREE
:
4607 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
) {
4609 kmem_cache_free(skbuff_head_cache
, skb
);
4623 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
4625 skb_mark_napi_id(skb
, napi
);
4626 trace_napi_gro_receive_entry(skb
);
4628 skb_gro_reset_offset(skb
);
4630 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
4632 EXPORT_SYMBOL(napi_gro_receive
);
4634 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
4636 if (unlikely(skb
->pfmemalloc
)) {
4640 __skb_pull(skb
, skb_headlen(skb
));
4641 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4642 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
4644 skb
->dev
= napi
->dev
;
4646 skb
->encapsulation
= 0;
4647 skb_shinfo(skb
)->gso_type
= 0;
4648 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
4653 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
4655 struct sk_buff
*skb
= napi
->skb
;
4658 skb
= napi_alloc_skb(napi
, GRO_MAX_HEAD
);
4661 skb_mark_napi_id(skb
, napi
);
4666 EXPORT_SYMBOL(napi_get_frags
);
4668 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
4669 struct sk_buff
*skb
,
4675 __skb_push(skb
, ETH_HLEN
);
4676 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
4677 if (ret
== GRO_NORMAL
&& netif_receive_skb_internal(skb
))
4682 case GRO_MERGED_FREE
:
4683 napi_reuse_skb(napi
, skb
);
4693 /* Upper GRO stack assumes network header starts at gro_offset=0
4694 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4695 * We copy ethernet header into skb->data to have a common layout.
4697 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
4699 struct sk_buff
*skb
= napi
->skb
;
4700 const struct ethhdr
*eth
;
4701 unsigned int hlen
= sizeof(*eth
);
4705 skb_reset_mac_header(skb
);
4706 skb_gro_reset_offset(skb
);
4708 eth
= skb_gro_header_fast(skb
, 0);
4709 if (unlikely(skb_gro_header_hard(skb
, hlen
))) {
4710 eth
= skb_gro_header_slow(skb
, hlen
, 0);
4711 if (unlikely(!eth
)) {
4712 net_warn_ratelimited("%s: dropping impossible skb from %s\n",
4713 __func__
, napi
->dev
->name
);
4714 napi_reuse_skb(napi
, skb
);
4718 gro_pull_from_frag0(skb
, hlen
);
4719 NAPI_GRO_CB(skb
)->frag0
+= hlen
;
4720 NAPI_GRO_CB(skb
)->frag0_len
-= hlen
;
4722 __skb_pull(skb
, hlen
);
4725 * This works because the only protocols we care about don't require
4727 * We'll fix it up properly in napi_frags_finish()
4729 skb
->protocol
= eth
->h_proto
;
4734 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4736 struct sk_buff
*skb
= napi_frags_skb(napi
);
4741 trace_napi_gro_frags_entry(skb
);
4743 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4745 EXPORT_SYMBOL(napi_gro_frags
);
4747 /* Compute the checksum from gro_offset and return the folded value
4748 * after adding in any pseudo checksum.
4750 __sum16
__skb_gro_checksum_complete(struct sk_buff
*skb
)
4755 wsum
= skb_checksum(skb
, skb_gro_offset(skb
), skb_gro_len(skb
), 0);
4757 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4758 sum
= csum_fold(csum_add(NAPI_GRO_CB(skb
)->csum
, wsum
));
4760 if (unlikely(skb
->ip_summed
== CHECKSUM_COMPLETE
) &&
4761 !skb
->csum_complete_sw
)
4762 netdev_rx_csum_fault(skb
->dev
);
4765 NAPI_GRO_CB(skb
)->csum
= wsum
;
4766 NAPI_GRO_CB(skb
)->csum_valid
= 1;
4770 EXPORT_SYMBOL(__skb_gro_checksum_complete
);
4773 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4774 * Note: called with local irq disabled, but exits with local irq enabled.
4776 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4779 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4782 sd
->rps_ipi_list
= NULL
;
4786 /* Send pending IPI's to kick RPS processing on remote cpus. */
4788 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4790 if (cpu_online(remsd
->cpu
))
4791 smp_call_function_single_async(remsd
->cpu
,
4800 static bool sd_has_rps_ipi_waiting(struct softnet_data
*sd
)
4803 return sd
->rps_ipi_list
!= NULL
;
4809 static int process_backlog(struct napi_struct
*napi
, int quota
)
4812 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4814 /* Check if we have pending ipi, its better to send them now,
4815 * not waiting net_rx_action() end.
4817 if (sd_has_rps_ipi_waiting(sd
)) {
4818 local_irq_disable();
4819 net_rps_action_and_irq_enable(sd
);
4822 napi
->weight
= weight_p
;
4823 local_irq_disable();
4825 struct sk_buff
*skb
;
4827 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4830 __netif_receive_skb(skb
);
4832 local_irq_disable();
4833 input_queue_head_incr(sd
);
4834 if (++work
>= quota
) {
4841 if (skb_queue_empty(&sd
->input_pkt_queue
)) {
4843 * Inline a custom version of __napi_complete().
4844 * only current cpu owns and manipulates this napi,
4845 * and NAPI_STATE_SCHED is the only possible flag set
4847 * We can use a plain write instead of clear_bit(),
4848 * and we dont need an smp_mb() memory barrier.
4856 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4857 &sd
->process_queue
);
4866 * __napi_schedule - schedule for receive
4867 * @n: entry to schedule
4869 * The entry's receive function will be scheduled to run.
4870 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4872 void __napi_schedule(struct napi_struct
*n
)
4874 unsigned long flags
;
4876 local_irq_save(flags
);
4877 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4878 local_irq_restore(flags
);
4880 EXPORT_SYMBOL(__napi_schedule
);
4883 * __napi_schedule_irqoff - schedule for receive
4884 * @n: entry to schedule
4886 * Variant of __napi_schedule() assuming hard irqs are masked
4888 void __napi_schedule_irqoff(struct napi_struct
*n
)
4890 ____napi_schedule(this_cpu_ptr(&softnet_data
), n
);
4892 EXPORT_SYMBOL(__napi_schedule_irqoff
);
4894 void __napi_complete(struct napi_struct
*n
)
4896 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4898 list_del_init(&n
->poll_list
);
4899 smp_mb__before_atomic();
4900 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4902 EXPORT_SYMBOL(__napi_complete
);
4904 void napi_complete_done(struct napi_struct
*n
, int work_done
)
4906 unsigned long flags
;
4909 * don't let napi dequeue from the cpu poll list
4910 * just in case its running on a different cpu
4912 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4916 unsigned long timeout
= 0;
4919 timeout
= n
->dev
->gro_flush_timeout
;
4922 hrtimer_start(&n
->timer
, ns_to_ktime(timeout
),
4923 HRTIMER_MODE_REL_PINNED
);
4925 napi_gro_flush(n
, false);
4927 if (likely(list_empty(&n
->poll_list
))) {
4928 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED
, &n
->state
));
4930 /* If n->poll_list is not empty, we need to mask irqs */
4931 local_irq_save(flags
);
4933 local_irq_restore(flags
);
4936 EXPORT_SYMBOL(napi_complete_done
);
4938 /* must be called under rcu_read_lock(), as we dont take a reference */
4939 static struct napi_struct
*napi_by_id(unsigned int napi_id
)
4941 unsigned int hash
= napi_id
% HASH_SIZE(napi_hash
);
4942 struct napi_struct
*napi
;
4944 hlist_for_each_entry_rcu(napi
, &napi_hash
[hash
], napi_hash_node
)
4945 if (napi
->napi_id
== napi_id
)
4951 #if defined(CONFIG_NET_RX_BUSY_POLL)
4952 #define BUSY_POLL_BUDGET 8
4953 bool sk_busy_loop(struct sock
*sk
, int nonblock
)
4955 unsigned long end_time
= !nonblock
? sk_busy_loop_end_time(sk
) : 0;
4956 int (*busy_poll
)(struct napi_struct
*dev
);
4957 struct napi_struct
*napi
;
4962 napi
= napi_by_id(sk
->sk_napi_id
);
4966 /* Note: ndo_busy_poll method is optional in linux-4.5 */
4967 busy_poll
= napi
->dev
->netdev_ops
->ndo_busy_poll
;
4973 rc
= busy_poll(napi
);
4974 } else if (napi_schedule_prep(napi
)) {
4975 void *have
= netpoll_poll_lock(napi
);
4977 if (test_bit(NAPI_STATE_SCHED
, &napi
->state
)) {
4978 rc
= napi
->poll(napi
, BUSY_POLL_BUDGET
);
4979 trace_napi_poll(napi
);
4980 if (rc
== BUSY_POLL_BUDGET
) {
4981 napi_complete_done(napi
, rc
);
4982 napi_schedule(napi
);
4985 netpoll_poll_unlock(have
);
4988 NET_ADD_STATS_BH(sock_net(sk
),
4989 LINUX_MIB_BUSYPOLLRXPACKETS
, rc
);
4992 if (rc
== LL_FLUSH_FAILED
)
4993 break; /* permanent failure */
4996 } while (!nonblock
&& skb_queue_empty(&sk
->sk_receive_queue
) &&
4997 !need_resched() && !busy_loop_timeout(end_time
));
4999 rc
= !skb_queue_empty(&sk
->sk_receive_queue
);
5004 EXPORT_SYMBOL(sk_busy_loop
);
5006 #endif /* CONFIG_NET_RX_BUSY_POLL */
5008 void napi_hash_add(struct napi_struct
*napi
)
5010 if (test_bit(NAPI_STATE_NO_BUSY_POLL
, &napi
->state
) ||
5011 test_and_set_bit(NAPI_STATE_HASHED
, &napi
->state
))
5014 spin_lock(&napi_hash_lock
);
5016 /* 0..NR_CPUS+1 range is reserved for sender_cpu use */
5018 if (unlikely(++napi_gen_id
< NR_CPUS
+ 1))
5019 napi_gen_id
= NR_CPUS
+ 1;
5020 } while (napi_by_id(napi_gen_id
));
5021 napi
->napi_id
= napi_gen_id
;
5023 hlist_add_head_rcu(&napi
->napi_hash_node
,
5024 &napi_hash
[napi
->napi_id
% HASH_SIZE(napi_hash
)]);
5026 spin_unlock(&napi_hash_lock
);
5028 EXPORT_SYMBOL_GPL(napi_hash_add
);
5030 /* Warning : caller is responsible to make sure rcu grace period
5031 * is respected before freeing memory containing @napi
5033 bool napi_hash_del(struct napi_struct
*napi
)
5035 bool rcu_sync_needed
= false;
5037 spin_lock(&napi_hash_lock
);
5039 if (test_and_clear_bit(NAPI_STATE_HASHED
, &napi
->state
)) {
5040 rcu_sync_needed
= true;
5041 hlist_del_rcu(&napi
->napi_hash_node
);
5043 spin_unlock(&napi_hash_lock
);
5044 return rcu_sync_needed
;
5046 EXPORT_SYMBOL_GPL(napi_hash_del
);
5048 static enum hrtimer_restart
napi_watchdog(struct hrtimer
*timer
)
5050 struct napi_struct
*napi
;
5052 napi
= container_of(timer
, struct napi_struct
, timer
);
5054 napi_schedule(napi
);
5056 return HRTIMER_NORESTART
;
5059 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
5060 int (*poll
)(struct napi_struct
*, int), int weight
)
5062 INIT_LIST_HEAD(&napi
->poll_list
);
5063 hrtimer_init(&napi
->timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_REL_PINNED
);
5064 napi
->timer
.function
= napi_watchdog
;
5065 napi
->gro_count
= 0;
5066 napi
->gro_list
= NULL
;
5069 if (weight
> NAPI_POLL_WEIGHT
)
5070 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
5072 napi
->weight
= weight
;
5073 list_add(&napi
->dev_list
, &dev
->napi_list
);
5075 #ifdef CONFIG_NETPOLL
5076 spin_lock_init(&napi
->poll_lock
);
5077 napi
->poll_owner
= -1;
5079 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
5080 napi_hash_add(napi
);
5082 EXPORT_SYMBOL(netif_napi_add
);
5084 void napi_disable(struct napi_struct
*n
)
5087 set_bit(NAPI_STATE_DISABLE
, &n
->state
);
5089 while (test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
))
5091 while (test_and_set_bit(NAPI_STATE_NPSVC
, &n
->state
))
5094 hrtimer_cancel(&n
->timer
);
5096 clear_bit(NAPI_STATE_DISABLE
, &n
->state
);
5098 EXPORT_SYMBOL(napi_disable
);
5100 /* Must be called in process context */
5101 void netif_napi_del(struct napi_struct
*napi
)
5104 if (napi_hash_del(napi
))
5106 list_del_init(&napi
->dev_list
);
5107 napi_free_frags(napi
);
5109 kfree_skb_list(napi
->gro_list
);
5110 napi
->gro_list
= NULL
;
5111 napi
->gro_count
= 0;
5113 EXPORT_SYMBOL(netif_napi_del
);
5115 static int napi_poll(struct napi_struct
*n
, struct list_head
*repoll
)
5120 list_del_init(&n
->poll_list
);
5122 have
= netpoll_poll_lock(n
);
5126 /* This NAPI_STATE_SCHED test is for avoiding a race
5127 * with netpoll's poll_napi(). Only the entity which
5128 * obtains the lock and sees NAPI_STATE_SCHED set will
5129 * actually make the ->poll() call. Therefore we avoid
5130 * accidentally calling ->poll() when NAPI is not scheduled.
5133 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
5134 work
= n
->poll(n
, weight
);
5138 WARN_ON_ONCE(work
> weight
);
5140 if (likely(work
< weight
))
5143 /* Drivers must not modify the NAPI state if they
5144 * consume the entire weight. In such cases this code
5145 * still "owns" the NAPI instance and therefore can
5146 * move the instance around on the list at-will.
5148 if (unlikely(napi_disable_pending(n
))) {
5154 /* flush too old packets
5155 * If HZ < 1000, flush all packets.
5157 napi_gro_flush(n
, HZ
>= 1000);
5160 /* Some drivers may have called napi_schedule
5161 * prior to exhausting their budget.
5163 if (unlikely(!list_empty(&n
->poll_list
))) {
5164 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
5165 n
->dev
? n
->dev
->name
: "backlog");
5169 list_add_tail(&n
->poll_list
, repoll
);
5172 netpoll_poll_unlock(have
);
5177 static void net_rx_action(struct softirq_action
*h
)
5179 struct softnet_data
*sd
= this_cpu_ptr(&softnet_data
);
5180 unsigned long time_limit
= jiffies
+ 2;
5181 int budget
= netdev_budget
;
5185 local_irq_disable();
5186 list_splice_init(&sd
->poll_list
, &list
);
5190 struct napi_struct
*n
;
5192 if (list_empty(&list
)) {
5193 if (!sd_has_rps_ipi_waiting(sd
) && list_empty(&repoll
))
5198 n
= list_first_entry(&list
, struct napi_struct
, poll_list
);
5199 budget
-= napi_poll(n
, &repoll
);
5201 /* If softirq window is exhausted then punt.
5202 * Allow this to run for 2 jiffies since which will allow
5203 * an average latency of 1.5/HZ.
5205 if (unlikely(budget
<= 0 ||
5206 time_after_eq(jiffies
, time_limit
))) {
5212 __kfree_skb_flush();
5213 local_irq_disable();
5215 list_splice_tail_init(&sd
->poll_list
, &list
);
5216 list_splice_tail(&repoll
, &list
);
5217 list_splice(&list
, &sd
->poll_list
);
5218 if (!list_empty(&sd
->poll_list
))
5219 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
5221 net_rps_action_and_irq_enable(sd
);
5224 struct netdev_adjacent
{
5225 struct net_device
*dev
;
5227 /* upper master flag, there can only be one master device per list */
5230 /* counter for the number of times this device was added to us */
5233 /* private field for the users */
5236 struct list_head list
;
5237 struct rcu_head rcu
;
5240 static struct netdev_adjacent
*__netdev_find_adj(struct net_device
*adj_dev
,
5241 struct list_head
*adj_list
)
5243 struct netdev_adjacent
*adj
;
5245 list_for_each_entry(adj
, adj_list
, list
) {
5246 if (adj
->dev
== adj_dev
)
5253 * netdev_has_upper_dev - Check if device is linked to an upper device
5255 * @upper_dev: upper device to check
5257 * Find out if a device is linked to specified upper device and return true
5258 * in case it is. Note that this checks only immediate upper device,
5259 * not through a complete stack of devices. The caller must hold the RTNL lock.
5261 bool netdev_has_upper_dev(struct net_device
*dev
,
5262 struct net_device
*upper_dev
)
5266 return __netdev_find_adj(upper_dev
, &dev
->all_adj_list
.upper
);
5268 EXPORT_SYMBOL(netdev_has_upper_dev
);
5271 * netdev_has_any_upper_dev - Check if device is linked to some device
5274 * Find out if a device is linked to an upper device and return true in case
5275 * it is. The caller must hold the RTNL lock.
5277 static bool netdev_has_any_upper_dev(struct net_device
*dev
)
5281 return !list_empty(&dev
->all_adj_list
.upper
);
5285 * netdev_master_upper_dev_get - Get master upper device
5288 * Find a master upper device and return pointer to it or NULL in case
5289 * it's not there. The caller must hold the RTNL lock.
5291 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
5293 struct netdev_adjacent
*upper
;
5297 if (list_empty(&dev
->adj_list
.upper
))
5300 upper
= list_first_entry(&dev
->adj_list
.upper
,
5301 struct netdev_adjacent
, list
);
5302 if (likely(upper
->master
))
5306 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
5308 void *netdev_adjacent_get_private(struct list_head
*adj_list
)
5310 struct netdev_adjacent
*adj
;
5312 adj
= list_entry(adj_list
, struct netdev_adjacent
, list
);
5314 return adj
->private;
5316 EXPORT_SYMBOL(netdev_adjacent_get_private
);
5319 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
5321 * @iter: list_head ** of the current position
5323 * Gets the next device from the dev's upper list, starting from iter
5324 * position. The caller must hold RCU read lock.
5326 struct net_device
*netdev_upper_get_next_dev_rcu(struct net_device
*dev
,
5327 struct list_head
**iter
)
5329 struct netdev_adjacent
*upper
;
5331 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5333 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5335 if (&upper
->list
== &dev
->adj_list
.upper
)
5338 *iter
= &upper
->list
;
5342 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu
);
5345 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
5347 * @iter: list_head ** of the current position
5349 * Gets the next device from the dev's upper list, starting from iter
5350 * position. The caller must hold RCU read lock.
5352 struct net_device
*netdev_all_upper_get_next_dev_rcu(struct net_device
*dev
,
5353 struct list_head
**iter
)
5355 struct netdev_adjacent
*upper
;
5357 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5359 upper
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5361 if (&upper
->list
== &dev
->all_adj_list
.upper
)
5364 *iter
= &upper
->list
;
5368 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu
);
5371 * netdev_lower_get_next_private - Get the next ->private from the
5372 * lower neighbour list
5374 * @iter: list_head ** of the current position
5376 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5377 * list, starting from iter position. The caller must hold either hold the
5378 * RTNL lock or its own locking that guarantees that the neighbour lower
5379 * list will remain unchanged.
5381 void *netdev_lower_get_next_private(struct net_device
*dev
,
5382 struct list_head
**iter
)
5384 struct netdev_adjacent
*lower
;
5386 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
5388 if (&lower
->list
== &dev
->adj_list
.lower
)
5391 *iter
= lower
->list
.next
;
5393 return lower
->private;
5395 EXPORT_SYMBOL(netdev_lower_get_next_private
);
5398 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5399 * lower neighbour list, RCU
5402 * @iter: list_head ** of the current position
5404 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5405 * list, starting from iter position. The caller must hold RCU read lock.
5407 void *netdev_lower_get_next_private_rcu(struct net_device
*dev
,
5408 struct list_head
**iter
)
5410 struct netdev_adjacent
*lower
;
5412 WARN_ON_ONCE(!rcu_read_lock_held());
5414 lower
= list_entry_rcu((*iter
)->next
, struct netdev_adjacent
, list
);
5416 if (&lower
->list
== &dev
->adj_list
.lower
)
5419 *iter
= &lower
->list
;
5421 return lower
->private;
5423 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu
);
5426 * netdev_lower_get_next - Get the next device from the lower neighbour
5429 * @iter: list_head ** of the current position
5431 * Gets the next netdev_adjacent from the dev's lower neighbour
5432 * list, starting from iter position. The caller must hold RTNL lock or
5433 * its own locking that guarantees that the neighbour lower
5434 * list will remain unchanged.
5436 void *netdev_lower_get_next(struct net_device
*dev
, struct list_head
**iter
)
5438 struct netdev_adjacent
*lower
;
5440 lower
= list_entry(*iter
, struct netdev_adjacent
, list
);
5442 if (&lower
->list
== &dev
->adj_list
.lower
)
5445 *iter
= lower
->list
.next
;
5449 EXPORT_SYMBOL(netdev_lower_get_next
);
5452 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5453 * lower neighbour list, RCU
5457 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5458 * list. The caller must hold RCU read lock.
5460 void *netdev_lower_get_first_private_rcu(struct net_device
*dev
)
5462 struct netdev_adjacent
*lower
;
5464 lower
= list_first_or_null_rcu(&dev
->adj_list
.lower
,
5465 struct netdev_adjacent
, list
);
5467 return lower
->private;
5470 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu
);
5473 * netdev_master_upper_dev_get_rcu - Get master upper device
5476 * Find a master upper device and return pointer to it or NULL in case
5477 * it's not there. The caller must hold the RCU read lock.
5479 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
5481 struct netdev_adjacent
*upper
;
5483 upper
= list_first_or_null_rcu(&dev
->adj_list
.upper
,
5484 struct netdev_adjacent
, list
);
5485 if (upper
&& likely(upper
->master
))
5489 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
5491 static int netdev_adjacent_sysfs_add(struct net_device
*dev
,
5492 struct net_device
*adj_dev
,
5493 struct list_head
*dev_list
)
5495 char linkname
[IFNAMSIZ
+7];
5496 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5497 "upper_%s" : "lower_%s", adj_dev
->name
);
5498 return sysfs_create_link(&(dev
->dev
.kobj
), &(adj_dev
->dev
.kobj
),
5501 static void netdev_adjacent_sysfs_del(struct net_device
*dev
,
5503 struct list_head
*dev_list
)
5505 char linkname
[IFNAMSIZ
+7];
5506 sprintf(linkname
, dev_list
== &dev
->adj_list
.upper
?
5507 "upper_%s" : "lower_%s", name
);
5508 sysfs_remove_link(&(dev
->dev
.kobj
), linkname
);
5511 static inline bool netdev_adjacent_is_neigh_list(struct net_device
*dev
,
5512 struct net_device
*adj_dev
,
5513 struct list_head
*dev_list
)
5515 return (dev_list
== &dev
->adj_list
.upper
||
5516 dev_list
== &dev
->adj_list
.lower
) &&
5517 net_eq(dev_net(dev
), dev_net(adj_dev
));
5520 static int __netdev_adjacent_dev_insert(struct net_device
*dev
,
5521 struct net_device
*adj_dev
,
5522 struct list_head
*dev_list
,
5523 void *private, bool master
)
5525 struct netdev_adjacent
*adj
;
5528 adj
= __netdev_find_adj(adj_dev
, dev_list
);
5535 adj
= kmalloc(sizeof(*adj
), GFP_KERNEL
);
5540 adj
->master
= master
;
5542 adj
->private = private;
5545 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5546 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5548 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
)) {
5549 ret
= netdev_adjacent_sysfs_add(dev
, adj_dev
, dev_list
);
5554 /* Ensure that master link is always the first item in list. */
5556 ret
= sysfs_create_link(&(dev
->dev
.kobj
),
5557 &(adj_dev
->dev
.kobj
), "master");
5559 goto remove_symlinks
;
5561 list_add_rcu(&adj
->list
, dev_list
);
5563 list_add_tail_rcu(&adj
->list
, dev_list
);
5569 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5570 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5578 static void __netdev_adjacent_dev_remove(struct net_device
*dev
,
5579 struct net_device
*adj_dev
,
5580 struct list_head
*dev_list
)
5582 struct netdev_adjacent
*adj
;
5584 adj
= __netdev_find_adj(adj_dev
, dev_list
);
5587 pr_err("tried to remove device %s from %s\n",
5588 dev
->name
, adj_dev
->name
);
5592 if (adj
->ref_nr
> 1) {
5593 pr_debug("%s to %s ref_nr-- = %d\n", dev
->name
, adj_dev
->name
,
5600 sysfs_remove_link(&(dev
->dev
.kobj
), "master");
5602 if (netdev_adjacent_is_neigh_list(dev
, adj_dev
, dev_list
))
5603 netdev_adjacent_sysfs_del(dev
, adj_dev
->name
, dev_list
);
5605 list_del_rcu(&adj
->list
);
5606 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5607 adj_dev
->name
, dev
->name
, adj_dev
->name
);
5609 kfree_rcu(adj
, rcu
);
5612 static int __netdev_adjacent_dev_link_lists(struct net_device
*dev
,
5613 struct net_device
*upper_dev
,
5614 struct list_head
*up_list
,
5615 struct list_head
*down_list
,
5616 void *private, bool master
)
5620 ret
= __netdev_adjacent_dev_insert(dev
, upper_dev
, up_list
, private,
5625 ret
= __netdev_adjacent_dev_insert(upper_dev
, dev
, down_list
, private,
5628 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5635 static int __netdev_adjacent_dev_link(struct net_device
*dev
,
5636 struct net_device
*upper_dev
)
5638 return __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5639 &dev
->all_adj_list
.upper
,
5640 &upper_dev
->all_adj_list
.lower
,
5644 static void __netdev_adjacent_dev_unlink_lists(struct net_device
*dev
,
5645 struct net_device
*upper_dev
,
5646 struct list_head
*up_list
,
5647 struct list_head
*down_list
)
5649 __netdev_adjacent_dev_remove(dev
, upper_dev
, up_list
);
5650 __netdev_adjacent_dev_remove(upper_dev
, dev
, down_list
);
5653 static void __netdev_adjacent_dev_unlink(struct net_device
*dev
,
5654 struct net_device
*upper_dev
)
5656 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5657 &dev
->all_adj_list
.upper
,
5658 &upper_dev
->all_adj_list
.lower
);
5661 static int __netdev_adjacent_dev_link_neighbour(struct net_device
*dev
,
5662 struct net_device
*upper_dev
,
5663 void *private, bool master
)
5665 int ret
= __netdev_adjacent_dev_link(dev
, upper_dev
);
5670 ret
= __netdev_adjacent_dev_link_lists(dev
, upper_dev
,
5671 &dev
->adj_list
.upper
,
5672 &upper_dev
->adj_list
.lower
,
5675 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5682 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device
*dev
,
5683 struct net_device
*upper_dev
)
5685 __netdev_adjacent_dev_unlink(dev
, upper_dev
);
5686 __netdev_adjacent_dev_unlink_lists(dev
, upper_dev
,
5687 &dev
->adj_list
.upper
,
5688 &upper_dev
->adj_list
.lower
);
5691 static int __netdev_upper_dev_link(struct net_device
*dev
,
5692 struct net_device
*upper_dev
, bool master
,
5693 void *upper_priv
, void *upper_info
)
5695 struct netdev_notifier_changeupper_info changeupper_info
;
5696 struct netdev_adjacent
*i
, *j
, *to_i
, *to_j
;
5701 if (dev
== upper_dev
)
5704 /* To prevent loops, check if dev is not upper device to upper_dev. */
5705 if (__netdev_find_adj(dev
, &upper_dev
->all_adj_list
.upper
))
5708 if (__netdev_find_adj(upper_dev
, &dev
->adj_list
.upper
))
5711 if (master
&& netdev_master_upper_dev_get(dev
))
5714 changeupper_info
.upper_dev
= upper_dev
;
5715 changeupper_info
.master
= master
;
5716 changeupper_info
.linking
= true;
5717 changeupper_info
.upper_info
= upper_info
;
5719 ret
= call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
, dev
,
5720 &changeupper_info
.info
);
5721 ret
= notifier_to_errno(ret
);
5725 ret
= __netdev_adjacent_dev_link_neighbour(dev
, upper_dev
, upper_priv
,
5730 /* Now that we linked these devs, make all the upper_dev's
5731 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5732 * versa, and don't forget the devices itself. All of these
5733 * links are non-neighbours.
5735 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5736 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5737 pr_debug("Interlinking %s with %s, non-neighbour\n",
5738 i
->dev
->name
, j
->dev
->name
);
5739 ret
= __netdev_adjacent_dev_link(i
->dev
, j
->dev
);
5745 /* add dev to every upper_dev's upper device */
5746 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5747 pr_debug("linking %s's upper device %s with %s\n",
5748 upper_dev
->name
, i
->dev
->name
, dev
->name
);
5749 ret
= __netdev_adjacent_dev_link(dev
, i
->dev
);
5751 goto rollback_upper_mesh
;
5754 /* add upper_dev to every dev's lower device */
5755 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5756 pr_debug("linking %s's lower device %s with %s\n", dev
->name
,
5757 i
->dev
->name
, upper_dev
->name
);
5758 ret
= __netdev_adjacent_dev_link(i
->dev
, upper_dev
);
5760 goto rollback_lower_mesh
;
5763 ret
= call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5764 &changeupper_info
.info
);
5765 ret
= notifier_to_errno(ret
);
5767 goto rollback_lower_mesh
;
5771 rollback_lower_mesh
:
5773 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5776 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5781 rollback_upper_mesh
:
5783 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
) {
5786 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5794 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
) {
5795 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
) {
5796 if (i
== to_i
&& j
== to_j
)
5798 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5804 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5810 * netdev_upper_dev_link - Add a link to the upper device
5812 * @upper_dev: new upper device
5814 * Adds a link to device which is upper to this one. The caller must hold
5815 * the RTNL lock. On a failure a negative errno code is returned.
5816 * On success the reference counts are adjusted and the function
5819 int netdev_upper_dev_link(struct net_device
*dev
,
5820 struct net_device
*upper_dev
)
5822 return __netdev_upper_dev_link(dev
, upper_dev
, false, NULL
, NULL
);
5824 EXPORT_SYMBOL(netdev_upper_dev_link
);
5827 * netdev_master_upper_dev_link - Add a master link to the upper device
5829 * @upper_dev: new upper device
5830 * @upper_priv: upper device private
5831 * @upper_info: upper info to be passed down via notifier
5833 * Adds a link to device which is upper to this one. In this case, only
5834 * one master upper device can be linked, although other non-master devices
5835 * might be linked as well. The caller must hold the RTNL lock.
5836 * On a failure a negative errno code is returned. On success the reference
5837 * counts are adjusted and the function returns zero.
5839 int netdev_master_upper_dev_link(struct net_device
*dev
,
5840 struct net_device
*upper_dev
,
5841 void *upper_priv
, void *upper_info
)
5843 return __netdev_upper_dev_link(dev
, upper_dev
, true,
5844 upper_priv
, upper_info
);
5846 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
5849 * netdev_upper_dev_unlink - Removes a link to upper device
5851 * @upper_dev: new upper device
5853 * Removes a link to device which is upper to this one. The caller must hold
5856 void netdev_upper_dev_unlink(struct net_device
*dev
,
5857 struct net_device
*upper_dev
)
5859 struct netdev_notifier_changeupper_info changeupper_info
;
5860 struct netdev_adjacent
*i
, *j
;
5863 changeupper_info
.upper_dev
= upper_dev
;
5864 changeupper_info
.master
= netdev_master_upper_dev_get(dev
) == upper_dev
;
5865 changeupper_info
.linking
= false;
5867 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER
, dev
,
5868 &changeupper_info
.info
);
5870 __netdev_adjacent_dev_unlink_neighbour(dev
, upper_dev
);
5872 /* Here is the tricky part. We must remove all dev's lower
5873 * devices from all upper_dev's upper devices and vice
5874 * versa, to maintain the graph relationship.
5876 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5877 list_for_each_entry(j
, &upper_dev
->all_adj_list
.upper
, list
)
5878 __netdev_adjacent_dev_unlink(i
->dev
, j
->dev
);
5880 /* remove also the devices itself from lower/upper device
5883 list_for_each_entry(i
, &dev
->all_adj_list
.lower
, list
)
5884 __netdev_adjacent_dev_unlink(i
->dev
, upper_dev
);
5886 list_for_each_entry(i
, &upper_dev
->all_adj_list
.upper
, list
)
5887 __netdev_adjacent_dev_unlink(dev
, i
->dev
);
5889 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER
, dev
,
5890 &changeupper_info
.info
);
5892 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
5895 * netdev_bonding_info_change - Dispatch event about slave change
5897 * @bonding_info: info to dispatch
5899 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5900 * The caller must hold the RTNL lock.
5902 void netdev_bonding_info_change(struct net_device
*dev
,
5903 struct netdev_bonding_info
*bonding_info
)
5905 struct netdev_notifier_bonding_info info
;
5907 memcpy(&info
.bonding_info
, bonding_info
,
5908 sizeof(struct netdev_bonding_info
));
5909 call_netdevice_notifiers_info(NETDEV_BONDING_INFO
, dev
,
5912 EXPORT_SYMBOL(netdev_bonding_info_change
);
5914 static void netdev_adjacent_add_links(struct net_device
*dev
)
5916 struct netdev_adjacent
*iter
;
5918 struct net
*net
= dev_net(dev
);
5920 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5921 if (!net_eq(net
,dev_net(iter
->dev
)))
5923 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5924 &iter
->dev
->adj_list
.lower
);
5925 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5926 &dev
->adj_list
.upper
);
5929 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5930 if (!net_eq(net
,dev_net(iter
->dev
)))
5932 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5933 &iter
->dev
->adj_list
.upper
);
5934 netdev_adjacent_sysfs_add(dev
, iter
->dev
,
5935 &dev
->adj_list
.lower
);
5939 static void netdev_adjacent_del_links(struct net_device
*dev
)
5941 struct netdev_adjacent
*iter
;
5943 struct net
*net
= dev_net(dev
);
5945 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5946 if (!net_eq(net
,dev_net(iter
->dev
)))
5948 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5949 &iter
->dev
->adj_list
.lower
);
5950 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5951 &dev
->adj_list
.upper
);
5954 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5955 if (!net_eq(net
,dev_net(iter
->dev
)))
5957 netdev_adjacent_sysfs_del(iter
->dev
, dev
->name
,
5958 &iter
->dev
->adj_list
.upper
);
5959 netdev_adjacent_sysfs_del(dev
, iter
->dev
->name
,
5960 &dev
->adj_list
.lower
);
5964 void netdev_adjacent_rename_links(struct net_device
*dev
, char *oldname
)
5966 struct netdev_adjacent
*iter
;
5968 struct net
*net
= dev_net(dev
);
5970 list_for_each_entry(iter
, &dev
->adj_list
.upper
, list
) {
5971 if (!net_eq(net
,dev_net(iter
->dev
)))
5973 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5974 &iter
->dev
->adj_list
.lower
);
5975 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5976 &iter
->dev
->adj_list
.lower
);
5979 list_for_each_entry(iter
, &dev
->adj_list
.lower
, list
) {
5980 if (!net_eq(net
,dev_net(iter
->dev
)))
5982 netdev_adjacent_sysfs_del(iter
->dev
, oldname
,
5983 &iter
->dev
->adj_list
.upper
);
5984 netdev_adjacent_sysfs_add(iter
->dev
, dev
,
5985 &iter
->dev
->adj_list
.upper
);
5989 void *netdev_lower_dev_get_private(struct net_device
*dev
,
5990 struct net_device
*lower_dev
)
5992 struct netdev_adjacent
*lower
;
5996 lower
= __netdev_find_adj(lower_dev
, &dev
->adj_list
.lower
);
6000 return lower
->private;
6002 EXPORT_SYMBOL(netdev_lower_dev_get_private
);
6005 int dev_get_nest_level(struct net_device
*dev
,
6006 bool (*type_check
)(const struct net_device
*dev
))
6008 struct net_device
*lower
= NULL
;
6009 struct list_head
*iter
;
6015 netdev_for_each_lower_dev(dev
, lower
, iter
) {
6016 nest
= dev_get_nest_level(lower
, type_check
);
6017 if (max_nest
< nest
)
6021 if (type_check(dev
))
6026 EXPORT_SYMBOL(dev_get_nest_level
);
6029 * netdev_lower_change - Dispatch event about lower device state change
6030 * @lower_dev: device
6031 * @lower_state_info: state to dispatch
6033 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
6034 * The caller must hold the RTNL lock.
6036 void netdev_lower_state_changed(struct net_device
*lower_dev
,
6037 void *lower_state_info
)
6039 struct netdev_notifier_changelowerstate_info changelowerstate_info
;
6042 changelowerstate_info
.lower_state_info
= lower_state_info
;
6043 call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE
, lower_dev
,
6044 &changelowerstate_info
.info
);
6046 EXPORT_SYMBOL(netdev_lower_state_changed
);
6048 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
6050 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6052 if (ops
->ndo_change_rx_flags
)
6053 ops
->ndo_change_rx_flags(dev
, flags
);
6056 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
, bool notify
)
6058 unsigned int old_flags
= dev
->flags
;
6064 dev
->flags
|= IFF_PROMISC
;
6065 dev
->promiscuity
+= inc
;
6066 if (dev
->promiscuity
== 0) {
6069 * If inc causes overflow, untouch promisc and return error.
6072 dev
->flags
&= ~IFF_PROMISC
;
6074 dev
->promiscuity
-= inc
;
6075 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
6080 if (dev
->flags
!= old_flags
) {
6081 pr_info("device %s %s promiscuous mode\n",
6083 dev
->flags
& IFF_PROMISC
? "entered" : "left");
6084 if (audit_enabled
) {
6085 current_uid_gid(&uid
, &gid
);
6086 audit_log(current
->audit_context
, GFP_ATOMIC
,
6087 AUDIT_ANOM_PROMISCUOUS
,
6088 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
6089 dev
->name
, (dev
->flags
& IFF_PROMISC
),
6090 (old_flags
& IFF_PROMISC
),
6091 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
6092 from_kuid(&init_user_ns
, uid
),
6093 from_kgid(&init_user_ns
, gid
),
6094 audit_get_sessionid(current
));
6097 dev_change_rx_flags(dev
, IFF_PROMISC
);
6100 __dev_notify_flags(dev
, old_flags
, IFF_PROMISC
);
6105 * dev_set_promiscuity - update promiscuity count on a device
6109 * Add or remove promiscuity from a device. While the count in the device
6110 * remains above zero the interface remains promiscuous. Once it hits zero
6111 * the device reverts back to normal filtering operation. A negative inc
6112 * value is used to drop promiscuity on the device.
6113 * Return 0 if successful or a negative errno code on error.
6115 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
6117 unsigned int old_flags
= dev
->flags
;
6120 err
= __dev_set_promiscuity(dev
, inc
, true);
6123 if (dev
->flags
!= old_flags
)
6124 dev_set_rx_mode(dev
);
6127 EXPORT_SYMBOL(dev_set_promiscuity
);
6129 static int __dev_set_allmulti(struct net_device
*dev
, int inc
, bool notify
)
6131 unsigned int old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
6135 dev
->flags
|= IFF_ALLMULTI
;
6136 dev
->allmulti
+= inc
;
6137 if (dev
->allmulti
== 0) {
6140 * If inc causes overflow, untouch allmulti and return error.
6143 dev
->flags
&= ~IFF_ALLMULTI
;
6145 dev
->allmulti
-= inc
;
6146 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
6151 if (dev
->flags
^ old_flags
) {
6152 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
6153 dev_set_rx_mode(dev
);
6155 __dev_notify_flags(dev
, old_flags
,
6156 dev
->gflags
^ old_gflags
);
6162 * dev_set_allmulti - update allmulti count on a device
6166 * Add or remove reception of all multicast frames to a device. While the
6167 * count in the device remains above zero the interface remains listening
6168 * to all interfaces. Once it hits zero the device reverts back to normal
6169 * filtering operation. A negative @inc value is used to drop the counter
6170 * when releasing a resource needing all multicasts.
6171 * Return 0 if successful or a negative errno code on error.
6174 int dev_set_allmulti(struct net_device
*dev
, int inc
)
6176 return __dev_set_allmulti(dev
, inc
, true);
6178 EXPORT_SYMBOL(dev_set_allmulti
);
6181 * Upload unicast and multicast address lists to device and
6182 * configure RX filtering. When the device doesn't support unicast
6183 * filtering it is put in promiscuous mode while unicast addresses
6186 void __dev_set_rx_mode(struct net_device
*dev
)
6188 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6190 /* dev_open will call this function so the list will stay sane. */
6191 if (!(dev
->flags
&IFF_UP
))
6194 if (!netif_device_present(dev
))
6197 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
6198 /* Unicast addresses changes may only happen under the rtnl,
6199 * therefore calling __dev_set_promiscuity here is safe.
6201 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
6202 __dev_set_promiscuity(dev
, 1, false);
6203 dev
->uc_promisc
= true;
6204 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
6205 __dev_set_promiscuity(dev
, -1, false);
6206 dev
->uc_promisc
= false;
6210 if (ops
->ndo_set_rx_mode
)
6211 ops
->ndo_set_rx_mode(dev
);
6214 void dev_set_rx_mode(struct net_device
*dev
)
6216 netif_addr_lock_bh(dev
);
6217 __dev_set_rx_mode(dev
);
6218 netif_addr_unlock_bh(dev
);
6222 * dev_get_flags - get flags reported to userspace
6225 * Get the combination of flag bits exported through APIs to userspace.
6227 unsigned int dev_get_flags(const struct net_device
*dev
)
6231 flags
= (dev
->flags
& ~(IFF_PROMISC
|
6236 (dev
->gflags
& (IFF_PROMISC
|
6239 if (netif_running(dev
)) {
6240 if (netif_oper_up(dev
))
6241 flags
|= IFF_RUNNING
;
6242 if (netif_carrier_ok(dev
))
6243 flags
|= IFF_LOWER_UP
;
6244 if (netif_dormant(dev
))
6245 flags
|= IFF_DORMANT
;
6250 EXPORT_SYMBOL(dev_get_flags
);
6252 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
6254 unsigned int old_flags
= dev
->flags
;
6260 * Set the flags on our device.
6263 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
6264 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
6266 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
6270 * Load in the correct multicast list now the flags have changed.
6273 if ((old_flags
^ flags
) & IFF_MULTICAST
)
6274 dev_change_rx_flags(dev
, IFF_MULTICAST
);
6276 dev_set_rx_mode(dev
);
6279 * Have we downed the interface. We handle IFF_UP ourselves
6280 * according to user attempts to set it, rather than blindly
6285 if ((old_flags
^ flags
) & IFF_UP
)
6286 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
6288 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
6289 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
6290 unsigned int old_flags
= dev
->flags
;
6292 dev
->gflags
^= IFF_PROMISC
;
6294 if (__dev_set_promiscuity(dev
, inc
, false) >= 0)
6295 if (dev
->flags
!= old_flags
)
6296 dev_set_rx_mode(dev
);
6299 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
6300 is important. Some (broken) drivers set IFF_PROMISC, when
6301 IFF_ALLMULTI is requested not asking us and not reporting.
6303 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
6304 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
6306 dev
->gflags
^= IFF_ALLMULTI
;
6307 __dev_set_allmulti(dev
, inc
, false);
6313 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
,
6314 unsigned int gchanges
)
6316 unsigned int changes
= dev
->flags
^ old_flags
;
6319 rtmsg_ifinfo(RTM_NEWLINK
, dev
, gchanges
, GFP_ATOMIC
);
6321 if (changes
& IFF_UP
) {
6322 if (dev
->flags
& IFF_UP
)
6323 call_netdevice_notifiers(NETDEV_UP
, dev
);
6325 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
6328 if (dev
->flags
& IFF_UP
&&
6329 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
))) {
6330 struct netdev_notifier_change_info change_info
;
6332 change_info
.flags_changed
= changes
;
6333 call_netdevice_notifiers_info(NETDEV_CHANGE
, dev
,
6339 * dev_change_flags - change device settings
6341 * @flags: device state flags
6343 * Change settings on device based state flags. The flags are
6344 * in the userspace exported format.
6346 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
6349 unsigned int changes
, old_flags
= dev
->flags
, old_gflags
= dev
->gflags
;
6351 ret
= __dev_change_flags(dev
, flags
);
6355 changes
= (old_flags
^ dev
->flags
) | (old_gflags
^ dev
->gflags
);
6356 __dev_notify_flags(dev
, old_flags
, changes
);
6359 EXPORT_SYMBOL(dev_change_flags
);
6361 static int __dev_set_mtu(struct net_device
*dev
, int new_mtu
)
6363 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6365 if (ops
->ndo_change_mtu
)
6366 return ops
->ndo_change_mtu(dev
, new_mtu
);
6373 * dev_set_mtu - Change maximum transfer unit
6375 * @new_mtu: new transfer unit
6377 * Change the maximum transfer size of the network device.
6379 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
6383 if (new_mtu
== dev
->mtu
)
6386 /* MTU must be positive. */
6390 if (!netif_device_present(dev
))
6393 err
= call_netdevice_notifiers(NETDEV_PRECHANGEMTU
, dev
);
6394 err
= notifier_to_errno(err
);
6398 orig_mtu
= dev
->mtu
;
6399 err
= __dev_set_mtu(dev
, new_mtu
);
6402 err
= call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6403 err
= notifier_to_errno(err
);
6405 /* setting mtu back and notifying everyone again,
6406 * so that they have a chance to revert changes.
6408 __dev_set_mtu(dev
, orig_mtu
);
6409 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
6414 EXPORT_SYMBOL(dev_set_mtu
);
6417 * dev_set_group - Change group this device belongs to
6419 * @new_group: group this device should belong to
6421 void dev_set_group(struct net_device
*dev
, int new_group
)
6423 dev
->group
= new_group
;
6425 EXPORT_SYMBOL(dev_set_group
);
6428 * dev_set_mac_address - Change Media Access Control Address
6432 * Change the hardware (MAC) address of the device
6434 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
6436 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6439 if (!ops
->ndo_set_mac_address
)
6441 if (sa
->sa_family
!= dev
->type
)
6443 if (!netif_device_present(dev
))
6445 err
= ops
->ndo_set_mac_address(dev
, sa
);
6448 dev
->addr_assign_type
= NET_ADDR_SET
;
6449 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
6450 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
6453 EXPORT_SYMBOL(dev_set_mac_address
);
6456 * dev_change_carrier - Change device carrier
6458 * @new_carrier: new value
6460 * Change device carrier
6462 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
6464 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6466 if (!ops
->ndo_change_carrier
)
6468 if (!netif_device_present(dev
))
6470 return ops
->ndo_change_carrier(dev
, new_carrier
);
6472 EXPORT_SYMBOL(dev_change_carrier
);
6475 * dev_get_phys_port_id - Get device physical port ID
6479 * Get device physical port ID
6481 int dev_get_phys_port_id(struct net_device
*dev
,
6482 struct netdev_phys_item_id
*ppid
)
6484 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6486 if (!ops
->ndo_get_phys_port_id
)
6488 return ops
->ndo_get_phys_port_id(dev
, ppid
);
6490 EXPORT_SYMBOL(dev_get_phys_port_id
);
6493 * dev_get_phys_port_name - Get device physical port name
6496 * @len: limit of bytes to copy to name
6498 * Get device physical port name
6500 int dev_get_phys_port_name(struct net_device
*dev
,
6501 char *name
, size_t len
)
6503 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6505 if (!ops
->ndo_get_phys_port_name
)
6507 return ops
->ndo_get_phys_port_name(dev
, name
, len
);
6509 EXPORT_SYMBOL(dev_get_phys_port_name
);
6512 * dev_change_proto_down - update protocol port state information
6514 * @proto_down: new value
6516 * This info can be used by switch drivers to set the phys state of the
6519 int dev_change_proto_down(struct net_device
*dev
, bool proto_down
)
6521 const struct net_device_ops
*ops
= dev
->netdev_ops
;
6523 if (!ops
->ndo_change_proto_down
)
6525 if (!netif_device_present(dev
))
6527 return ops
->ndo_change_proto_down(dev
, proto_down
);
6529 EXPORT_SYMBOL(dev_change_proto_down
);
6532 * dev_new_index - allocate an ifindex
6533 * @net: the applicable net namespace
6535 * Returns a suitable unique value for a new device interface
6536 * number. The caller must hold the rtnl semaphore or the
6537 * dev_base_lock to be sure it remains unique.
6539 static int dev_new_index(struct net
*net
)
6541 int ifindex
= net
->ifindex
;
6545 if (!__dev_get_by_index(net
, ifindex
))
6546 return net
->ifindex
= ifindex
;
6550 /* Delayed registration/unregisteration */
6551 static LIST_HEAD(net_todo_list
);
6552 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq
);
6554 static void net_set_todo(struct net_device
*dev
)
6556 list_add_tail(&dev
->todo_list
, &net_todo_list
);
6557 dev_net(dev
)->dev_unreg_count
++;
6560 static void rollback_registered_many(struct list_head
*head
)
6562 struct net_device
*dev
, *tmp
;
6563 LIST_HEAD(close_head
);
6565 BUG_ON(dev_boot_phase
);
6568 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
6569 /* Some devices call without registering
6570 * for initialization unwind. Remove those
6571 * devices and proceed with the remaining.
6573 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6574 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6578 list_del(&dev
->unreg_list
);
6581 dev
->dismantle
= true;
6582 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
6585 /* If device is running, close it first. */
6586 list_for_each_entry(dev
, head
, unreg_list
)
6587 list_add_tail(&dev
->close_list
, &close_head
);
6588 dev_close_many(&close_head
, true);
6590 list_for_each_entry(dev
, head
, unreg_list
) {
6591 /* And unlink it from device chain. */
6592 unlist_netdevice(dev
);
6594 dev
->reg_state
= NETREG_UNREGISTERING
;
6595 on_each_cpu(flush_backlog
, dev
, 1);
6600 list_for_each_entry(dev
, head
, unreg_list
) {
6601 struct sk_buff
*skb
= NULL
;
6603 /* Shutdown queueing discipline. */
6607 /* Notify protocols, that we are about to destroy
6608 this device. They should clean all the things.
6610 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6612 if (!dev
->rtnl_link_ops
||
6613 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
6614 skb
= rtmsg_ifinfo_build_skb(RTM_DELLINK
, dev
, ~0U,
6618 * Flush the unicast and multicast chains
6623 if (dev
->netdev_ops
->ndo_uninit
)
6624 dev
->netdev_ops
->ndo_uninit(dev
);
6627 rtmsg_ifinfo_send(skb
, dev
, GFP_KERNEL
);
6629 /* Notifier chain MUST detach us all upper devices. */
6630 WARN_ON(netdev_has_any_upper_dev(dev
));
6632 /* Remove entries from kobject tree */
6633 netdev_unregister_kobject(dev
);
6635 /* Remove XPS queueing entries */
6636 netif_reset_xps_queues_gt(dev
, 0);
6642 list_for_each_entry(dev
, head
, unreg_list
)
6646 static void rollback_registered(struct net_device
*dev
)
6650 list_add(&dev
->unreg_list
, &single
);
6651 rollback_registered_many(&single
);
6655 static netdev_features_t
netdev_sync_upper_features(struct net_device
*lower
,
6656 struct net_device
*upper
, netdev_features_t features
)
6658 netdev_features_t upper_disables
= NETIF_F_UPPER_DISABLES
;
6659 netdev_features_t feature
;
6662 for_each_netdev_feature(&upper_disables
, feature_bit
) {
6663 feature
= __NETIF_F_BIT(feature_bit
);
6664 if (!(upper
->wanted_features
& feature
)
6665 && (features
& feature
)) {
6666 netdev_dbg(lower
, "Dropping feature %pNF, upper dev %s has it off.\n",
6667 &feature
, upper
->name
);
6668 features
&= ~feature
;
6675 static void netdev_sync_lower_features(struct net_device
*upper
,
6676 struct net_device
*lower
, netdev_features_t features
)
6678 netdev_features_t upper_disables
= NETIF_F_UPPER_DISABLES
;
6679 netdev_features_t feature
;
6682 for_each_netdev_feature(&upper_disables
, feature_bit
) {
6683 feature
= __NETIF_F_BIT(feature_bit
);
6684 if (!(features
& feature
) && (lower
->features
& feature
)) {
6685 netdev_dbg(upper
, "Disabling feature %pNF on lower dev %s.\n",
6686 &feature
, lower
->name
);
6687 lower
->wanted_features
&= ~feature
;
6688 netdev_update_features(lower
);
6690 if (unlikely(lower
->features
& feature
))
6691 netdev_WARN(upper
, "failed to disable %pNF on %s!\n",
6692 &feature
, lower
->name
);
6697 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
6698 netdev_features_t features
)
6700 /* Fix illegal checksum combinations */
6701 if ((features
& NETIF_F_HW_CSUM
) &&
6702 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
6703 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
6704 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
6707 /* TSO requires that SG is present as well. */
6708 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
6709 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
6710 features
&= ~NETIF_F_ALL_TSO
;
6713 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
6714 !(features
& NETIF_F_IP_CSUM
)) {
6715 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
6716 features
&= ~NETIF_F_TSO
;
6717 features
&= ~NETIF_F_TSO_ECN
;
6720 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
6721 !(features
& NETIF_F_IPV6_CSUM
)) {
6722 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
6723 features
&= ~NETIF_F_TSO6
;
6726 /* TSO ECN requires that TSO is present as well. */
6727 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
6728 features
&= ~NETIF_F_TSO_ECN
;
6730 /* Software GSO depends on SG. */
6731 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
6732 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
6733 features
&= ~NETIF_F_GSO
;
6736 /* UFO needs SG and checksumming */
6737 if (features
& NETIF_F_UFO
) {
6738 /* maybe split UFO into V4 and V6? */
6739 if (!(features
& NETIF_F_HW_CSUM
) &&
6740 ((features
& (NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
)) !=
6741 (NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
))) {
6743 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6744 features
&= ~NETIF_F_UFO
;
6747 if (!(features
& NETIF_F_SG
)) {
6749 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6750 features
&= ~NETIF_F_UFO
;
6754 /* GSO partial features require GSO partial be set */
6755 if ((features
& dev
->gso_partial_features
) &&
6756 !(features
& NETIF_F_GSO_PARTIAL
)) {
6758 "Dropping partially supported GSO features since no GSO partial.\n");
6759 features
&= ~dev
->gso_partial_features
;
6762 #ifdef CONFIG_NET_RX_BUSY_POLL
6763 if (dev
->netdev_ops
->ndo_busy_poll
)
6764 features
|= NETIF_F_BUSY_POLL
;
6767 features
&= ~NETIF_F_BUSY_POLL
;
6772 int __netdev_update_features(struct net_device
*dev
)
6774 struct net_device
*upper
, *lower
;
6775 netdev_features_t features
;
6776 struct list_head
*iter
;
6781 features
= netdev_get_wanted_features(dev
);
6783 if (dev
->netdev_ops
->ndo_fix_features
)
6784 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
6786 /* driver might be less strict about feature dependencies */
6787 features
= netdev_fix_features(dev
, features
);
6789 /* some features can't be enabled if they're off an an upper device */
6790 netdev_for_each_upper_dev_rcu(dev
, upper
, iter
)
6791 features
= netdev_sync_upper_features(dev
, upper
, features
);
6793 if (dev
->features
== features
)
6796 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
6797 &dev
->features
, &features
);
6799 if (dev
->netdev_ops
->ndo_set_features
)
6800 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
6804 if (unlikely(err
< 0)) {
6806 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6807 err
, &features
, &dev
->features
);
6808 /* return non-0 since some features might have changed and
6809 * it's better to fire a spurious notification than miss it
6815 /* some features must be disabled on lower devices when disabled
6816 * on an upper device (think: bonding master or bridge)
6818 netdev_for_each_lower_dev(dev
, lower
, iter
)
6819 netdev_sync_lower_features(dev
, lower
, features
);
6822 dev
->features
= features
;
6824 return err
< 0 ? 0 : 1;
6828 * netdev_update_features - recalculate device features
6829 * @dev: the device to check
6831 * Recalculate dev->features set and send notifications if it
6832 * has changed. Should be called after driver or hardware dependent
6833 * conditions might have changed that influence the features.
6835 void netdev_update_features(struct net_device
*dev
)
6837 if (__netdev_update_features(dev
))
6838 netdev_features_change(dev
);
6840 EXPORT_SYMBOL(netdev_update_features
);
6843 * netdev_change_features - recalculate device features
6844 * @dev: the device to check
6846 * Recalculate dev->features set and send notifications even
6847 * if they have not changed. Should be called instead of
6848 * netdev_update_features() if also dev->vlan_features might
6849 * have changed to allow the changes to be propagated to stacked
6852 void netdev_change_features(struct net_device
*dev
)
6854 __netdev_update_features(dev
);
6855 netdev_features_change(dev
);
6857 EXPORT_SYMBOL(netdev_change_features
);
6860 * netif_stacked_transfer_operstate - transfer operstate
6861 * @rootdev: the root or lower level device to transfer state from
6862 * @dev: the device to transfer operstate to
6864 * Transfer operational state from root to device. This is normally
6865 * called when a stacking relationship exists between the root
6866 * device and the device(a leaf device).
6868 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
6869 struct net_device
*dev
)
6871 if (rootdev
->operstate
== IF_OPER_DORMANT
)
6872 netif_dormant_on(dev
);
6874 netif_dormant_off(dev
);
6876 if (netif_carrier_ok(rootdev
)) {
6877 if (!netif_carrier_ok(dev
))
6878 netif_carrier_on(dev
);
6880 if (netif_carrier_ok(dev
))
6881 netif_carrier_off(dev
);
6884 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
6887 static int netif_alloc_rx_queues(struct net_device
*dev
)
6889 unsigned int i
, count
= dev
->num_rx_queues
;
6890 struct netdev_rx_queue
*rx
;
6891 size_t sz
= count
* sizeof(*rx
);
6895 rx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6903 for (i
= 0; i
< count
; i
++)
6909 static void netdev_init_one_queue(struct net_device
*dev
,
6910 struct netdev_queue
*queue
, void *_unused
)
6912 /* Initialize queue lock */
6913 spin_lock_init(&queue
->_xmit_lock
);
6914 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
6915 queue
->xmit_lock_owner
= -1;
6916 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
6919 dql_init(&queue
->dql
, HZ
);
6923 static void netif_free_tx_queues(struct net_device
*dev
)
6928 static int netif_alloc_netdev_queues(struct net_device
*dev
)
6930 unsigned int count
= dev
->num_tx_queues
;
6931 struct netdev_queue
*tx
;
6932 size_t sz
= count
* sizeof(*tx
);
6934 if (count
< 1 || count
> 0xffff)
6937 tx
= kzalloc(sz
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
6945 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
6946 spin_lock_init(&dev
->tx_global_lock
);
6951 void netif_tx_stop_all_queues(struct net_device
*dev
)
6955 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
6956 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
6957 netif_tx_stop_queue(txq
);
6960 EXPORT_SYMBOL(netif_tx_stop_all_queues
);
6963 * register_netdevice - register a network device
6964 * @dev: device to register
6966 * Take a completed network device structure and add it to the kernel
6967 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6968 * chain. 0 is returned on success. A negative errno code is returned
6969 * on a failure to set up the device, or if the name is a duplicate.
6971 * Callers must hold the rtnl semaphore. You may want
6972 * register_netdev() instead of this.
6975 * The locking appears insufficient to guarantee two parallel registers
6976 * will not get the same name.
6979 int register_netdevice(struct net_device
*dev
)
6982 struct net
*net
= dev_net(dev
);
6984 BUG_ON(dev_boot_phase
);
6989 /* When net_device's are persistent, this will be fatal. */
6990 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
6993 spin_lock_init(&dev
->addr_list_lock
);
6994 netdev_set_addr_lockdep_class(dev
);
6996 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
7000 /* Init, if this function is available */
7001 if (dev
->netdev_ops
->ndo_init
) {
7002 ret
= dev
->netdev_ops
->ndo_init(dev
);
7010 if (((dev
->hw_features
| dev
->features
) &
7011 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
7012 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
7013 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
7014 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
7021 dev
->ifindex
= dev_new_index(net
);
7022 else if (__dev_get_by_index(net
, dev
->ifindex
))
7025 /* Transfer changeable features to wanted_features and enable
7026 * software offloads (GSO and GRO).
7028 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
7029 dev
->features
|= NETIF_F_SOFT_FEATURES
;
7030 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
7032 if (!(dev
->flags
& IFF_LOOPBACK
))
7033 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
7035 if (dev
->hw_features
& NETIF_F_TSO
)
7036 dev
->hw_features
|= NETIF_F_TSO_MANGLEID
;
7038 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
7040 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
7042 /* Make NETIF_F_SG inheritable to tunnel devices.
7044 dev
->hw_enc_features
|= NETIF_F_SG
| NETIF_F_GSO_PARTIAL
;
7046 /* Make NETIF_F_SG inheritable to MPLS.
7048 dev
->mpls_features
|= NETIF_F_SG
;
7050 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
7051 ret
= notifier_to_errno(ret
);
7055 ret
= netdev_register_kobject(dev
);
7058 dev
->reg_state
= NETREG_REGISTERED
;
7060 __netdev_update_features(dev
);
7063 * Default initial state at registry is that the
7064 * device is present.
7067 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
7069 linkwatch_init_dev(dev
);
7071 dev_init_scheduler(dev
);
7073 list_netdevice(dev
);
7074 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
7076 /* If the device has permanent device address, driver should
7077 * set dev_addr and also addr_assign_type should be set to
7078 * NET_ADDR_PERM (default value).
7080 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
7081 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
7083 /* Notify protocols, that a new device appeared. */
7084 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
7085 ret
= notifier_to_errno(ret
);
7087 rollback_registered(dev
);
7088 dev
->reg_state
= NETREG_UNREGISTERED
;
7091 * Prevent userspace races by waiting until the network
7092 * device is fully setup before sending notifications.
7094 if (!dev
->rtnl_link_ops
||
7095 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
7096 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
7102 if (dev
->netdev_ops
->ndo_uninit
)
7103 dev
->netdev_ops
->ndo_uninit(dev
);
7106 EXPORT_SYMBOL(register_netdevice
);
7109 * init_dummy_netdev - init a dummy network device for NAPI
7110 * @dev: device to init
7112 * This takes a network device structure and initialize the minimum
7113 * amount of fields so it can be used to schedule NAPI polls without
7114 * registering a full blown interface. This is to be used by drivers
7115 * that need to tie several hardware interfaces to a single NAPI
7116 * poll scheduler due to HW limitations.
7118 int init_dummy_netdev(struct net_device
*dev
)
7120 /* Clear everything. Note we don't initialize spinlocks
7121 * are they aren't supposed to be taken by any of the
7122 * NAPI code and this dummy netdev is supposed to be
7123 * only ever used for NAPI polls
7125 memset(dev
, 0, sizeof(struct net_device
));
7127 /* make sure we BUG if trying to hit standard
7128 * register/unregister code path
7130 dev
->reg_state
= NETREG_DUMMY
;
7132 /* NAPI wants this */
7133 INIT_LIST_HEAD(&dev
->napi_list
);
7135 /* a dummy interface is started by default */
7136 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
7137 set_bit(__LINK_STATE_START
, &dev
->state
);
7139 /* Note : We dont allocate pcpu_refcnt for dummy devices,
7140 * because users of this 'device' dont need to change
7146 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
7150 * register_netdev - register a network device
7151 * @dev: device to register
7153 * Take a completed network device structure and add it to the kernel
7154 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
7155 * chain. 0 is returned on success. A negative errno code is returned
7156 * on a failure to set up the device, or if the name is a duplicate.
7158 * This is a wrapper around register_netdevice that takes the rtnl semaphore
7159 * and expands the device name if you passed a format string to
7162 int register_netdev(struct net_device
*dev
)
7167 err
= register_netdevice(dev
);
7171 EXPORT_SYMBOL(register_netdev
);
7173 int netdev_refcnt_read(const struct net_device
*dev
)
7177 for_each_possible_cpu(i
)
7178 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
7181 EXPORT_SYMBOL(netdev_refcnt_read
);
7184 * netdev_wait_allrefs - wait until all references are gone.
7185 * @dev: target net_device
7187 * This is called when unregistering network devices.
7189 * Any protocol or device that holds a reference should register
7190 * for netdevice notification, and cleanup and put back the
7191 * reference if they receive an UNREGISTER event.
7192 * We can get stuck here if buggy protocols don't correctly
7195 static void netdev_wait_allrefs(struct net_device
*dev
)
7197 unsigned long rebroadcast_time
, warning_time
;
7200 linkwatch_forget_dev(dev
);
7202 rebroadcast_time
= warning_time
= jiffies
;
7203 refcnt
= netdev_refcnt_read(dev
);
7205 while (refcnt
!= 0) {
7206 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
7209 /* Rebroadcast unregister notification */
7210 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7216 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7217 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
7219 /* We must not have linkwatch events
7220 * pending on unregister. If this
7221 * happens, we simply run the queue
7222 * unscheduled, resulting in a noop
7225 linkwatch_run_queue();
7230 rebroadcast_time
= jiffies
;
7235 refcnt
= netdev_refcnt_read(dev
);
7237 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
7238 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
7240 warning_time
= jiffies
;
7249 * register_netdevice(x1);
7250 * register_netdevice(x2);
7252 * unregister_netdevice(y1);
7253 * unregister_netdevice(y2);
7259 * We are invoked by rtnl_unlock().
7260 * This allows us to deal with problems:
7261 * 1) We can delete sysfs objects which invoke hotplug
7262 * without deadlocking with linkwatch via keventd.
7263 * 2) Since we run with the RTNL semaphore not held, we can sleep
7264 * safely in order to wait for the netdev refcnt to drop to zero.
7266 * We must not return until all unregister events added during
7267 * the interval the lock was held have been completed.
7269 void netdev_run_todo(void)
7271 struct list_head list
;
7273 /* Snapshot list, allow later requests */
7274 list_replace_init(&net_todo_list
, &list
);
7279 /* Wait for rcu callbacks to finish before next phase */
7280 if (!list_empty(&list
))
7283 while (!list_empty(&list
)) {
7284 struct net_device
*dev
7285 = list_first_entry(&list
, struct net_device
, todo_list
);
7286 list_del(&dev
->todo_list
);
7289 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7292 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
7293 pr_err("network todo '%s' but state %d\n",
7294 dev
->name
, dev
->reg_state
);
7299 dev
->reg_state
= NETREG_UNREGISTERED
;
7301 netdev_wait_allrefs(dev
);
7304 BUG_ON(netdev_refcnt_read(dev
));
7305 BUG_ON(!list_empty(&dev
->ptype_all
));
7306 BUG_ON(!list_empty(&dev
->ptype_specific
));
7307 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
7308 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
7309 WARN_ON(dev
->dn_ptr
);
7311 if (dev
->destructor
)
7312 dev
->destructor(dev
);
7314 /* Report a network device has been unregistered */
7316 dev_net(dev
)->dev_unreg_count
--;
7318 wake_up(&netdev_unregistering_wq
);
7320 /* Free network device */
7321 kobject_put(&dev
->dev
.kobj
);
7325 /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
7326 * all the same fields in the same order as net_device_stats, with only
7327 * the type differing, but rtnl_link_stats64 may have additional fields
7328 * at the end for newer counters.
7330 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
7331 const struct net_device_stats
*netdev_stats
)
7333 #if BITS_PER_LONG == 64
7334 BUILD_BUG_ON(sizeof(*stats64
) < sizeof(*netdev_stats
));
7335 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
7336 /* zero out counters that only exist in rtnl_link_stats64 */
7337 memset((char *)stats64
+ sizeof(*netdev_stats
), 0,
7338 sizeof(*stats64
) - sizeof(*netdev_stats
));
7340 size_t i
, n
= sizeof(*netdev_stats
) / sizeof(unsigned long);
7341 const unsigned long *src
= (const unsigned long *)netdev_stats
;
7342 u64
*dst
= (u64
*)stats64
;
7344 BUILD_BUG_ON(n
> sizeof(*stats64
) / sizeof(u64
));
7345 for (i
= 0; i
< n
; i
++)
7347 /* zero out counters that only exist in rtnl_link_stats64 */
7348 memset((char *)stats64
+ n
* sizeof(u64
), 0,
7349 sizeof(*stats64
) - n
* sizeof(u64
));
7352 EXPORT_SYMBOL(netdev_stats_to_stats64
);
7355 * dev_get_stats - get network device statistics
7356 * @dev: device to get statistics from
7357 * @storage: place to store stats
7359 * Get network statistics from device. Return @storage.
7360 * The device driver may provide its own method by setting
7361 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
7362 * otherwise the internal statistics structure is used.
7364 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
7365 struct rtnl_link_stats64
*storage
)
7367 const struct net_device_ops
*ops
= dev
->netdev_ops
;
7369 if (ops
->ndo_get_stats64
) {
7370 memset(storage
, 0, sizeof(*storage
));
7371 ops
->ndo_get_stats64(dev
, storage
);
7372 } else if (ops
->ndo_get_stats
) {
7373 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
7375 netdev_stats_to_stats64(storage
, &dev
->stats
);
7377 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
7378 storage
->tx_dropped
+= atomic_long_read(&dev
->tx_dropped
);
7379 storage
->rx_nohandler
+= atomic_long_read(&dev
->rx_nohandler
);
7382 EXPORT_SYMBOL(dev_get_stats
);
7384 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
7386 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
7388 #ifdef CONFIG_NET_CLS_ACT
7391 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
7394 netdev_init_one_queue(dev
, queue
, NULL
);
7395 RCU_INIT_POINTER(queue
->qdisc
, &noop_qdisc
);
7396 queue
->qdisc_sleeping
= &noop_qdisc
;
7397 rcu_assign_pointer(dev
->ingress_queue
, queue
);
7402 static const struct ethtool_ops default_ethtool_ops
;
7404 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
7405 const struct ethtool_ops
*ops
)
7407 if (dev
->ethtool_ops
== &default_ethtool_ops
)
7408 dev
->ethtool_ops
= ops
;
7410 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
7412 void netdev_freemem(struct net_device
*dev
)
7414 char *addr
= (char *)dev
- dev
->padded
;
7420 * alloc_netdev_mqs - allocate network device
7421 * @sizeof_priv: size of private data to allocate space for
7422 * @name: device name format string
7423 * @name_assign_type: origin of device name
7424 * @setup: callback to initialize device
7425 * @txqs: the number of TX subqueues to allocate
7426 * @rxqs: the number of RX subqueues to allocate
7428 * Allocates a struct net_device with private data area for driver use
7429 * and performs basic initialization. Also allocates subqueue structs
7430 * for each queue on the device.
7432 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
7433 unsigned char name_assign_type
,
7434 void (*setup
)(struct net_device
*),
7435 unsigned int txqs
, unsigned int rxqs
)
7437 struct net_device
*dev
;
7439 struct net_device
*p
;
7441 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
7444 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
7450 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
7455 alloc_size
= sizeof(struct net_device
);
7457 /* ensure 32-byte alignment of private area */
7458 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
7459 alloc_size
+= sizeof_priv
;
7461 /* ensure 32-byte alignment of whole construct */
7462 alloc_size
+= NETDEV_ALIGN
- 1;
7464 p
= kzalloc(alloc_size
, GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
7466 p
= vzalloc(alloc_size
);
7470 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
7471 dev
->padded
= (char *)dev
- (char *)p
;
7473 dev
->pcpu_refcnt
= alloc_percpu(int);
7474 if (!dev
->pcpu_refcnt
)
7477 if (dev_addr_init(dev
))
7483 dev_net_set(dev
, &init_net
);
7485 dev
->gso_max_size
= GSO_MAX_SIZE
;
7486 dev
->gso_max_segs
= GSO_MAX_SEGS
;
7488 INIT_LIST_HEAD(&dev
->napi_list
);
7489 INIT_LIST_HEAD(&dev
->unreg_list
);
7490 INIT_LIST_HEAD(&dev
->close_list
);
7491 INIT_LIST_HEAD(&dev
->link_watch_list
);
7492 INIT_LIST_HEAD(&dev
->adj_list
.upper
);
7493 INIT_LIST_HEAD(&dev
->adj_list
.lower
);
7494 INIT_LIST_HEAD(&dev
->all_adj_list
.upper
);
7495 INIT_LIST_HEAD(&dev
->all_adj_list
.lower
);
7496 INIT_LIST_HEAD(&dev
->ptype_all
);
7497 INIT_LIST_HEAD(&dev
->ptype_specific
);
7498 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
;
7501 if (!dev
->tx_queue_len
) {
7502 dev
->priv_flags
|= IFF_NO_QUEUE
;
7503 dev
->tx_queue_len
= 1;
7506 dev
->num_tx_queues
= txqs
;
7507 dev
->real_num_tx_queues
= txqs
;
7508 if (netif_alloc_netdev_queues(dev
))
7512 dev
->num_rx_queues
= rxqs
;
7513 dev
->real_num_rx_queues
= rxqs
;
7514 if (netif_alloc_rx_queues(dev
))
7518 strcpy(dev
->name
, name
);
7519 dev
->name_assign_type
= name_assign_type
;
7520 dev
->group
= INIT_NETDEV_GROUP
;
7521 if (!dev
->ethtool_ops
)
7522 dev
->ethtool_ops
= &default_ethtool_ops
;
7524 nf_hook_ingress_init(dev
);
7533 free_percpu(dev
->pcpu_refcnt
);
7535 netdev_freemem(dev
);
7538 EXPORT_SYMBOL(alloc_netdev_mqs
);
7541 * free_netdev - free network device
7544 * This function does the last stage of destroying an allocated device
7545 * interface. The reference to the device object is released.
7546 * If this is the last reference then it will be freed.
7547 * Must be called in process context.
7549 void free_netdev(struct net_device
*dev
)
7551 struct napi_struct
*p
, *n
;
7554 netif_free_tx_queues(dev
);
7559 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
7561 /* Flush device addresses */
7562 dev_addr_flush(dev
);
7564 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
7567 free_percpu(dev
->pcpu_refcnt
);
7568 dev
->pcpu_refcnt
= NULL
;
7570 /* Compatibility with error handling in drivers */
7571 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
7572 netdev_freemem(dev
);
7576 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
7577 dev
->reg_state
= NETREG_RELEASED
;
7579 /* will free via device release */
7580 put_device(&dev
->dev
);
7582 EXPORT_SYMBOL(free_netdev
);
7585 * synchronize_net - Synchronize with packet receive processing
7587 * Wait for packets currently being received to be done.
7588 * Does not block later packets from starting.
7590 void synchronize_net(void)
7593 if (rtnl_is_locked())
7594 synchronize_rcu_expedited();
7598 EXPORT_SYMBOL(synchronize_net
);
7601 * unregister_netdevice_queue - remove device from the kernel
7605 * This function shuts down a device interface and removes it
7606 * from the kernel tables.
7607 * If head not NULL, device is queued to be unregistered later.
7609 * Callers must hold the rtnl semaphore. You may want
7610 * unregister_netdev() instead of this.
7613 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
7618 list_move_tail(&dev
->unreg_list
, head
);
7620 rollback_registered(dev
);
7621 /* Finish processing unregister after unlock */
7625 EXPORT_SYMBOL(unregister_netdevice_queue
);
7628 * unregister_netdevice_many - unregister many devices
7629 * @head: list of devices
7631 * Note: As most callers use a stack allocated list_head,
7632 * we force a list_del() to make sure stack wont be corrupted later.
7634 void unregister_netdevice_many(struct list_head
*head
)
7636 struct net_device
*dev
;
7638 if (!list_empty(head
)) {
7639 rollback_registered_many(head
);
7640 list_for_each_entry(dev
, head
, unreg_list
)
7645 EXPORT_SYMBOL(unregister_netdevice_many
);
7648 * unregister_netdev - remove device from the kernel
7651 * This function shuts down a device interface and removes it
7652 * from the kernel tables.
7654 * This is just a wrapper for unregister_netdevice that takes
7655 * the rtnl semaphore. In general you want to use this and not
7656 * unregister_netdevice.
7658 void unregister_netdev(struct net_device
*dev
)
7661 unregister_netdevice(dev
);
7664 EXPORT_SYMBOL(unregister_netdev
);
7667 * dev_change_net_namespace - move device to different nethost namespace
7669 * @net: network namespace
7670 * @pat: If not NULL name pattern to try if the current device name
7671 * is already taken in the destination network namespace.
7673 * This function shuts down a device interface and moves it
7674 * to a new network namespace. On success 0 is returned, on
7675 * a failure a netagive errno code is returned.
7677 * Callers must hold the rtnl semaphore.
7680 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
7686 /* Don't allow namespace local devices to be moved. */
7688 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
7691 /* Ensure the device has been registrered */
7692 if (dev
->reg_state
!= NETREG_REGISTERED
)
7695 /* Get out if there is nothing todo */
7697 if (net_eq(dev_net(dev
), net
))
7700 /* Pick the destination device name, and ensure
7701 * we can use it in the destination network namespace.
7704 if (__dev_get_by_name(net
, dev
->name
)) {
7705 /* We get here if we can't use the current device name */
7708 if (dev_get_valid_name(net
, dev
, pat
) < 0)
7713 * And now a mini version of register_netdevice unregister_netdevice.
7716 /* If device is running close it first. */
7719 /* And unlink it from device chain */
7721 unlist_netdevice(dev
);
7725 /* Shutdown queueing discipline. */
7728 /* Notify protocols, that we are about to destroy
7729 this device. They should clean all the things.
7731 Note that dev->reg_state stays at NETREG_REGISTERED.
7732 This is wanted because this way 8021q and macvlan know
7733 the device is just moving and can keep their slaves up.
7735 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
7737 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
7738 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U, GFP_KERNEL
);
7741 * Flush the unicast and multicast chains
7746 /* Send a netdev-removed uevent to the old namespace */
7747 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
7748 netdev_adjacent_del_links(dev
);
7750 /* Actually switch the network namespace */
7751 dev_net_set(dev
, net
);
7753 /* If there is an ifindex conflict assign a new one */
7754 if (__dev_get_by_index(net
, dev
->ifindex
))
7755 dev
->ifindex
= dev_new_index(net
);
7757 /* Send a netdev-add uevent to the new namespace */
7758 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
7759 netdev_adjacent_add_links(dev
);
7761 /* Fixup kobjects */
7762 err
= device_rename(&dev
->dev
, dev
->name
);
7765 /* Add the device back in the hashes */
7766 list_netdevice(dev
);
7768 /* Notify protocols, that a new device appeared. */
7769 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
7772 * Prevent userspace races by waiting until the network
7773 * device is fully setup before sending notifications.
7775 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U, GFP_KERNEL
);
7782 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
7784 static int dev_cpu_callback(struct notifier_block
*nfb
,
7785 unsigned long action
,
7788 struct sk_buff
**list_skb
;
7789 struct sk_buff
*skb
;
7790 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
7791 struct softnet_data
*sd
, *oldsd
;
7793 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
7796 local_irq_disable();
7797 cpu
= smp_processor_id();
7798 sd
= &per_cpu(softnet_data
, cpu
);
7799 oldsd
= &per_cpu(softnet_data
, oldcpu
);
7801 /* Find end of our completion_queue. */
7802 list_skb
= &sd
->completion_queue
;
7804 list_skb
= &(*list_skb
)->next
;
7805 /* Append completion queue from offline CPU. */
7806 *list_skb
= oldsd
->completion_queue
;
7807 oldsd
->completion_queue
= NULL
;
7809 /* Append output queue from offline CPU. */
7810 if (oldsd
->output_queue
) {
7811 *sd
->output_queue_tailp
= oldsd
->output_queue
;
7812 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
7813 oldsd
->output_queue
= NULL
;
7814 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
7816 /* Append NAPI poll list from offline CPU, with one exception :
7817 * process_backlog() must be called by cpu owning percpu backlog.
7818 * We properly handle process_queue & input_pkt_queue later.
7820 while (!list_empty(&oldsd
->poll_list
)) {
7821 struct napi_struct
*napi
= list_first_entry(&oldsd
->poll_list
,
7825 list_del_init(&napi
->poll_list
);
7826 if (napi
->poll
== process_backlog
)
7829 ____napi_schedule(sd
, napi
);
7832 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
7835 /* Process offline CPU's input_pkt_queue */
7836 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
7838 input_queue_head_incr(oldsd
);
7840 while ((skb
= skb_dequeue(&oldsd
->input_pkt_queue
))) {
7842 input_queue_head_incr(oldsd
);
7850 * netdev_increment_features - increment feature set by one
7851 * @all: current feature set
7852 * @one: new feature set
7853 * @mask: mask feature set
7855 * Computes a new feature set after adding a device with feature set
7856 * @one to the master device with current feature set @all. Will not
7857 * enable anything that is off in @mask. Returns the new feature set.
7859 netdev_features_t
netdev_increment_features(netdev_features_t all
,
7860 netdev_features_t one
, netdev_features_t mask
)
7862 if (mask
& NETIF_F_HW_CSUM
)
7863 mask
|= NETIF_F_CSUM_MASK
;
7864 mask
|= NETIF_F_VLAN_CHALLENGED
;
7866 all
|= one
& (NETIF_F_ONE_FOR_ALL
| NETIF_F_CSUM_MASK
) & mask
;
7867 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
7869 /* If one device supports hw checksumming, set for all. */
7870 if (all
& NETIF_F_HW_CSUM
)
7871 all
&= ~(NETIF_F_CSUM_MASK
& ~NETIF_F_HW_CSUM
);
7875 EXPORT_SYMBOL(netdev_increment_features
);
7877 static struct hlist_head
* __net_init
netdev_create_hash(void)
7880 struct hlist_head
*hash
;
7882 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
7884 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
7885 INIT_HLIST_HEAD(&hash
[i
]);
7890 /* Initialize per network namespace state */
7891 static int __net_init
netdev_init(struct net
*net
)
7893 if (net
!= &init_net
)
7894 INIT_LIST_HEAD(&net
->dev_base_head
);
7896 net
->dev_name_head
= netdev_create_hash();
7897 if (net
->dev_name_head
== NULL
)
7900 net
->dev_index_head
= netdev_create_hash();
7901 if (net
->dev_index_head
== NULL
)
7907 kfree(net
->dev_name_head
);
7913 * netdev_drivername - network driver for the device
7914 * @dev: network device
7916 * Determine network driver for device.
7918 const char *netdev_drivername(const struct net_device
*dev
)
7920 const struct device_driver
*driver
;
7921 const struct device
*parent
;
7922 const char *empty
= "";
7924 parent
= dev
->dev
.parent
;
7928 driver
= parent
->driver
;
7929 if (driver
&& driver
->name
)
7930 return driver
->name
;
7934 static void __netdev_printk(const char *level
, const struct net_device
*dev
,
7935 struct va_format
*vaf
)
7937 if (dev
&& dev
->dev
.parent
) {
7938 dev_printk_emit(level
[1] - '0',
7941 dev_driver_string(dev
->dev
.parent
),
7942 dev_name(dev
->dev
.parent
),
7943 netdev_name(dev
), netdev_reg_state(dev
),
7946 printk("%s%s%s: %pV",
7947 level
, netdev_name(dev
), netdev_reg_state(dev
), vaf
);
7949 printk("%s(NULL net_device): %pV", level
, vaf
);
7953 void netdev_printk(const char *level
, const struct net_device
*dev
,
7954 const char *format
, ...)
7956 struct va_format vaf
;
7959 va_start(args
, format
);
7964 __netdev_printk(level
, dev
, &vaf
);
7968 EXPORT_SYMBOL(netdev_printk
);
7970 #define define_netdev_printk_level(func, level) \
7971 void func(const struct net_device *dev, const char *fmt, ...) \
7973 struct va_format vaf; \
7976 va_start(args, fmt); \
7981 __netdev_printk(level, dev, &vaf); \
7985 EXPORT_SYMBOL(func);
7987 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
7988 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
7989 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
7990 define_netdev_printk_level(netdev_err
, KERN_ERR
);
7991 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
7992 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
7993 define_netdev_printk_level(netdev_info
, KERN_INFO
);
7995 static void __net_exit
netdev_exit(struct net
*net
)
7997 kfree(net
->dev_name_head
);
7998 kfree(net
->dev_index_head
);
8001 static struct pernet_operations __net_initdata netdev_net_ops
= {
8002 .init
= netdev_init
,
8003 .exit
= netdev_exit
,
8006 static void __net_exit
default_device_exit(struct net
*net
)
8008 struct net_device
*dev
, *aux
;
8010 * Push all migratable network devices back to the
8011 * initial network namespace
8014 for_each_netdev_safe(net
, dev
, aux
) {
8016 char fb_name
[IFNAMSIZ
];
8018 /* Ignore unmoveable devices (i.e. loopback) */
8019 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
8022 /* Leave virtual devices for the generic cleanup */
8023 if (dev
->rtnl_link_ops
)
8026 /* Push remaining network devices to init_net */
8027 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
8028 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
8030 pr_emerg("%s: failed to move %s to init_net: %d\n",
8031 __func__
, dev
->name
, err
);
8038 static void __net_exit
rtnl_lock_unregistering(struct list_head
*net_list
)
8040 /* Return with the rtnl_lock held when there are no network
8041 * devices unregistering in any network namespace in net_list.
8045 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
8047 add_wait_queue(&netdev_unregistering_wq
, &wait
);
8049 unregistering
= false;
8051 list_for_each_entry(net
, net_list
, exit_list
) {
8052 if (net
->dev_unreg_count
> 0) {
8053 unregistering
= true;
8061 wait_woken(&wait
, TASK_UNINTERRUPTIBLE
, MAX_SCHEDULE_TIMEOUT
);
8063 remove_wait_queue(&netdev_unregistering_wq
, &wait
);
8066 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
8068 /* At exit all network devices most be removed from a network
8069 * namespace. Do this in the reverse order of registration.
8070 * Do this across as many network namespaces as possible to
8071 * improve batching efficiency.
8073 struct net_device
*dev
;
8075 LIST_HEAD(dev_kill_list
);
8077 /* To prevent network device cleanup code from dereferencing
8078 * loopback devices or network devices that have been freed
8079 * wait here for all pending unregistrations to complete,
8080 * before unregistring the loopback device and allowing the
8081 * network namespace be freed.
8083 * The netdev todo list containing all network devices
8084 * unregistrations that happen in default_device_exit_batch
8085 * will run in the rtnl_unlock() at the end of
8086 * default_device_exit_batch.
8088 rtnl_lock_unregistering(net_list
);
8089 list_for_each_entry(net
, net_list
, exit_list
) {
8090 for_each_netdev_reverse(net
, dev
) {
8091 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
)
8092 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
8094 unregister_netdevice_queue(dev
, &dev_kill_list
);
8097 unregister_netdevice_many(&dev_kill_list
);
8101 static struct pernet_operations __net_initdata default_device_ops
= {
8102 .exit
= default_device_exit
,
8103 .exit_batch
= default_device_exit_batch
,
8107 * Initialize the DEV module. At boot time this walks the device list and
8108 * unhooks any devices that fail to initialise (normally hardware not
8109 * present) and leaves us with a valid list of present and active devices.
8114 * This is called single threaded during boot, so no need
8115 * to take the rtnl semaphore.
8117 static int __init
net_dev_init(void)
8119 int i
, rc
= -ENOMEM
;
8121 BUG_ON(!dev_boot_phase
);
8123 if (dev_proc_init())
8126 if (netdev_kobject_init())
8129 INIT_LIST_HEAD(&ptype_all
);
8130 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
8131 INIT_LIST_HEAD(&ptype_base
[i
]);
8133 INIT_LIST_HEAD(&offload_base
);
8135 if (register_pernet_subsys(&netdev_net_ops
))
8139 * Initialise the packet receive queues.
8142 for_each_possible_cpu(i
) {
8143 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
8145 skb_queue_head_init(&sd
->input_pkt_queue
);
8146 skb_queue_head_init(&sd
->process_queue
);
8147 INIT_LIST_HEAD(&sd
->poll_list
);
8148 sd
->output_queue_tailp
= &sd
->output_queue
;
8150 sd
->csd
.func
= rps_trigger_softirq
;
8155 sd
->backlog
.poll
= process_backlog
;
8156 sd
->backlog
.weight
= weight_p
;
8161 /* The loopback device is special if any other network devices
8162 * is present in a network namespace the loopback device must
8163 * be present. Since we now dynamically allocate and free the
8164 * loopback device ensure this invariant is maintained by
8165 * keeping the loopback device as the first device on the
8166 * list of network devices. Ensuring the loopback devices
8167 * is the first device that appears and the last network device
8170 if (register_pernet_device(&loopback_net_ops
))
8173 if (register_pernet_device(&default_device_ops
))
8176 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
8177 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
8179 hotcpu_notifier(dev_cpu_callback
, 0);
8186 subsys_initcall(net_dev_init
);