2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/stat.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <net/xfrm.h>
105 #include <linux/highmem.h>
106 #include <linux/init.h>
107 #include <linux/module.h>
108 #include <linux/netpoll.h>
109 #include <linux/rcupdate.h>
110 #include <linux/delay.h>
111 #include <net/iw_handler.h>
112 #include <asm/current.h>
113 #include <linux/audit.h>
114 #include <linux/dmaengine.h>
115 #include <linux/err.h>
116 #include <linux/ctype.h>
117 #include <linux/if_arp.h>
118 #include <linux/if_vlan.h>
119 #include <linux/ip.h>
121 #include <linux/ipv6.h>
122 #include <linux/in.h>
123 #include <linux/jhash.h>
124 #include <linux/random.h>
125 #include <trace/events/napi.h>
126 #include <trace/events/net.h>
127 #include <trace/events/skb.h>
128 #include <linux/pci.h>
129 #include <linux/inetdevice.h>
130 #include <linux/cpu_rmap.h>
131 #include <linux/static_key.h>
133 #include "net-sysfs.h"
135 /* Instead of increasing this, you should create a hash table. */
136 #define MAX_GRO_SKBS 8
138 /* This should be increased if a protocol with a bigger head is added. */
139 #define GRO_MAX_HEAD (MAX_HEADER + 128)
141 static DEFINE_SPINLOCK(ptype_lock
);
142 static DEFINE_SPINLOCK(offload_lock
);
143 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
144 struct list_head ptype_all __read_mostly
; /* Taps */
145 static struct list_head offload_base __read_mostly
;
148 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
151 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
153 * Writers must hold the rtnl semaphore while they loop through the
154 * dev_base_head list, and hold dev_base_lock for writing when they do the
155 * actual updates. This allows pure readers to access the list even
156 * while a writer is preparing to update it.
158 * To put it another way, dev_base_lock is held for writing only to
159 * protect against pure readers; the rtnl semaphore provides the
160 * protection against other writers.
162 * See, for example usages, register_netdevice() and
163 * unregister_netdevice(), which must be called with the rtnl
166 DEFINE_RWLOCK(dev_base_lock
);
167 EXPORT_SYMBOL(dev_base_lock
);
169 seqcount_t devnet_rename_seq
;
171 static inline void dev_base_seq_inc(struct net
*net
)
173 while (++net
->dev_base_seq
== 0);
176 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
178 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
180 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
183 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
185 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
188 static inline void rps_lock(struct softnet_data
*sd
)
191 spin_lock(&sd
->input_pkt_queue
.lock
);
195 static inline void rps_unlock(struct softnet_data
*sd
)
198 spin_unlock(&sd
->input_pkt_queue
.lock
);
202 /* Device list insertion */
203 static int list_netdevice(struct net_device
*dev
)
205 struct net
*net
= dev_net(dev
);
209 write_lock_bh(&dev_base_lock
);
210 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
211 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
212 hlist_add_head_rcu(&dev
->index_hlist
,
213 dev_index_hash(net
, dev
->ifindex
));
214 write_unlock_bh(&dev_base_lock
);
216 dev_base_seq_inc(net
);
221 /* Device list removal
222 * caller must respect a RCU grace period before freeing/reusing dev
224 static void unlist_netdevice(struct net_device
*dev
)
228 /* Unlink dev from the device chain */
229 write_lock_bh(&dev_base_lock
);
230 list_del_rcu(&dev
->dev_list
);
231 hlist_del_rcu(&dev
->name_hlist
);
232 hlist_del_rcu(&dev
->index_hlist
);
233 write_unlock_bh(&dev_base_lock
);
235 dev_base_seq_inc(dev_net(dev
));
242 static RAW_NOTIFIER_HEAD(netdev_chain
);
245 * Device drivers call our routines to queue packets here. We empty the
246 * queue in the local softnet handler.
249 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
250 EXPORT_PER_CPU_SYMBOL(softnet_data
);
252 #ifdef CONFIG_LOCKDEP
254 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
255 * according to dev->type
257 static const unsigned short netdev_lock_type
[] =
258 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
259 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
260 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
261 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
262 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
263 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
264 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
265 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
266 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
267 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
268 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
269 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
270 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
271 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
272 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
274 static const char *const netdev_lock_name
[] =
275 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
276 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
277 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
278 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
279 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
280 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
281 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
282 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
283 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
284 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
285 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
286 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
287 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
288 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
289 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
291 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
292 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
294 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
298 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
299 if (netdev_lock_type
[i
] == dev_type
)
301 /* the last key is used by default */
302 return ARRAY_SIZE(netdev_lock_type
) - 1;
305 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
306 unsigned short dev_type
)
310 i
= netdev_lock_pos(dev_type
);
311 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
312 netdev_lock_name
[i
]);
315 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
319 i
= netdev_lock_pos(dev
->type
);
320 lockdep_set_class_and_name(&dev
->addr_list_lock
,
321 &netdev_addr_lock_key
[i
],
322 netdev_lock_name
[i
]);
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
326 unsigned short dev_type
)
329 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
334 /*******************************************************************************
336 Protocol management and registration routines
338 *******************************************************************************/
341 * Add a protocol ID to the list. Now that the input handler is
342 * smarter we can dispense with all the messy stuff that used to be
345 * BEWARE!!! Protocol handlers, mangling input packets,
346 * MUST BE last in hash buckets and checking protocol handlers
347 * MUST start from promiscuous ptype_all chain in net_bh.
348 * It is true now, do not change it.
349 * Explanation follows: if protocol handler, mangling packet, will
350 * be the first on list, it is not able to sense, that packet
351 * is cloned and should be copied-on-write, so that it will
352 * change it and subsequent readers will get broken packet.
356 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
358 if (pt
->type
== htons(ETH_P_ALL
))
361 return &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
365 * dev_add_pack - add packet handler
366 * @pt: packet type declaration
368 * Add a protocol handler to the networking stack. The passed &packet_type
369 * is linked into kernel lists and may not be freed until it has been
370 * removed from the kernel lists.
372 * This call does not sleep therefore it can not
373 * guarantee all CPU's that are in middle of receiving packets
374 * will see the new packet type (until the next received packet).
377 void dev_add_pack(struct packet_type
*pt
)
379 struct list_head
*head
= ptype_head(pt
);
381 spin_lock(&ptype_lock
);
382 list_add_rcu(&pt
->list
, head
);
383 spin_unlock(&ptype_lock
);
385 EXPORT_SYMBOL(dev_add_pack
);
388 * __dev_remove_pack - remove packet handler
389 * @pt: packet type declaration
391 * Remove a protocol handler that was previously added to the kernel
392 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
393 * from the kernel lists and can be freed or reused once this function
396 * The packet type might still be in use by receivers
397 * and must not be freed until after all the CPU's have gone
398 * through a quiescent state.
400 void __dev_remove_pack(struct packet_type
*pt
)
402 struct list_head
*head
= ptype_head(pt
);
403 struct packet_type
*pt1
;
405 spin_lock(&ptype_lock
);
407 list_for_each_entry(pt1
, head
, list
) {
409 list_del_rcu(&pt
->list
);
414 pr_warn("dev_remove_pack: %p not found\n", pt
);
416 spin_unlock(&ptype_lock
);
418 EXPORT_SYMBOL(__dev_remove_pack
);
421 * dev_remove_pack - remove packet handler
422 * @pt: packet type declaration
424 * Remove a protocol handler that was previously added to the kernel
425 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
426 * from the kernel lists and can be freed or reused once this function
429 * This call sleeps to guarantee that no CPU is looking at the packet
432 void dev_remove_pack(struct packet_type
*pt
)
434 __dev_remove_pack(pt
);
438 EXPORT_SYMBOL(dev_remove_pack
);
442 * dev_add_offload - register offload handlers
443 * @po: protocol offload declaration
445 * Add protocol offload handlers to the networking stack. The passed
446 * &proto_offload is linked into kernel lists and may not be freed until
447 * it has been removed from the kernel lists.
449 * This call does not sleep therefore it can not
450 * guarantee all CPU's that are in middle of receiving packets
451 * will see the new offload handlers (until the next received packet).
453 void dev_add_offload(struct packet_offload
*po
)
455 struct list_head
*head
= &offload_base
;
457 spin_lock(&offload_lock
);
458 list_add_rcu(&po
->list
, head
);
459 spin_unlock(&offload_lock
);
461 EXPORT_SYMBOL(dev_add_offload
);
464 * __dev_remove_offload - remove offload handler
465 * @po: packet offload declaration
467 * Remove a protocol offload handler that was previously added to the
468 * kernel offload handlers by dev_add_offload(). The passed &offload_type
469 * is removed from the kernel lists and can be freed or reused once this
472 * The packet type might still be in use by receivers
473 * and must not be freed until after all the CPU's have gone
474 * through a quiescent state.
476 void __dev_remove_offload(struct packet_offload
*po
)
478 struct list_head
*head
= &offload_base
;
479 struct packet_offload
*po1
;
481 spin_lock(&offload_lock
);
483 list_for_each_entry(po1
, head
, list
) {
485 list_del_rcu(&po
->list
);
490 pr_warn("dev_remove_offload: %p not found\n", po
);
492 spin_unlock(&offload_lock
);
494 EXPORT_SYMBOL(__dev_remove_offload
);
497 * dev_remove_offload - remove packet offload handler
498 * @po: packet offload declaration
500 * Remove a packet offload handler that was previously added to the kernel
501 * offload handlers by dev_add_offload(). The passed &offload_type is
502 * removed from the kernel lists and can be freed or reused once this
505 * This call sleeps to guarantee that no CPU is looking at the packet
508 void dev_remove_offload(struct packet_offload
*po
)
510 __dev_remove_offload(po
);
514 EXPORT_SYMBOL(dev_remove_offload
);
516 /******************************************************************************
518 Device Boot-time Settings Routines
520 *******************************************************************************/
522 /* Boot time configuration table */
523 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
526 * netdev_boot_setup_add - add new setup entry
527 * @name: name of the device
528 * @map: configured settings for the device
530 * Adds new setup entry to the dev_boot_setup list. The function
531 * returns 0 on error and 1 on success. This is a generic routine to
534 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
536 struct netdev_boot_setup
*s
;
540 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
541 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
542 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
543 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
544 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
549 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
553 * netdev_boot_setup_check - check boot time settings
554 * @dev: the netdevice
556 * Check boot time settings for the device.
557 * The found settings are set for the device to be used
558 * later in the device probing.
559 * Returns 0 if no settings found, 1 if they are.
561 int netdev_boot_setup_check(struct net_device
*dev
)
563 struct netdev_boot_setup
*s
= dev_boot_setup
;
566 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
567 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
568 !strcmp(dev
->name
, s
[i
].name
)) {
569 dev
->irq
= s
[i
].map
.irq
;
570 dev
->base_addr
= s
[i
].map
.base_addr
;
571 dev
->mem_start
= s
[i
].map
.mem_start
;
572 dev
->mem_end
= s
[i
].map
.mem_end
;
578 EXPORT_SYMBOL(netdev_boot_setup_check
);
582 * netdev_boot_base - get address from boot time settings
583 * @prefix: prefix for network device
584 * @unit: id for network device
586 * Check boot time settings for the base address of device.
587 * The found settings are set for the device to be used
588 * later in the device probing.
589 * Returns 0 if no settings found.
591 unsigned long netdev_boot_base(const char *prefix
, int unit
)
593 const struct netdev_boot_setup
*s
= dev_boot_setup
;
597 sprintf(name
, "%s%d", prefix
, unit
);
600 * If device already registered then return base of 1
601 * to indicate not to probe for this interface
603 if (__dev_get_by_name(&init_net
, name
))
606 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
607 if (!strcmp(name
, s
[i
].name
))
608 return s
[i
].map
.base_addr
;
613 * Saves at boot time configured settings for any netdevice.
615 int __init
netdev_boot_setup(char *str
)
620 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
625 memset(&map
, 0, sizeof(map
));
629 map
.base_addr
= ints
[2];
631 map
.mem_start
= ints
[3];
633 map
.mem_end
= ints
[4];
635 /* Add new entry to the list */
636 return netdev_boot_setup_add(str
, &map
);
639 __setup("netdev=", netdev_boot_setup
);
641 /*******************************************************************************
643 Device Interface Subroutines
645 *******************************************************************************/
648 * __dev_get_by_name - find a device by its name
649 * @net: the applicable net namespace
650 * @name: name to find
652 * Find an interface by name. Must be called under RTNL semaphore
653 * or @dev_base_lock. If the name is found a pointer to the device
654 * is returned. If the name is not found then %NULL is returned. The
655 * reference counters are not incremented so the caller must be
656 * careful with locks.
659 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
661 struct net_device
*dev
;
662 struct hlist_head
*head
= dev_name_hash(net
, name
);
664 hlist_for_each_entry(dev
, head
, name_hlist
)
665 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
670 EXPORT_SYMBOL(__dev_get_by_name
);
673 * dev_get_by_name_rcu - find a device by its name
674 * @net: the applicable net namespace
675 * @name: name to find
677 * Find an interface by name.
678 * If the name is found a pointer to the device is returned.
679 * If the name is not found then %NULL is returned.
680 * The reference counters are not incremented so the caller must be
681 * careful with locks. The caller must hold RCU lock.
684 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
686 struct net_device
*dev
;
687 struct hlist_head
*head
= dev_name_hash(net
, name
);
689 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
690 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
695 EXPORT_SYMBOL(dev_get_by_name_rcu
);
698 * dev_get_by_name - find a device by its name
699 * @net: the applicable net namespace
700 * @name: name to find
702 * Find an interface by name. This can be called from any
703 * context and does its own locking. The returned handle has
704 * the usage count incremented and the caller must use dev_put() to
705 * release it when it is no longer needed. %NULL is returned if no
706 * matching device is found.
709 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
711 struct net_device
*dev
;
714 dev
= dev_get_by_name_rcu(net
, name
);
720 EXPORT_SYMBOL(dev_get_by_name
);
723 * __dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns %NULL if the device
728 * is not found or a pointer to the device. The device has not
729 * had its reference counter increased so the caller must be careful
730 * about locking. The caller must hold either the RTNL semaphore
734 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
736 struct net_device
*dev
;
737 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
739 hlist_for_each_entry(dev
, head
, index_hlist
)
740 if (dev
->ifindex
== ifindex
)
745 EXPORT_SYMBOL(__dev_get_by_index
);
748 * dev_get_by_index_rcu - find a device by its ifindex
749 * @net: the applicable net namespace
750 * @ifindex: index of device
752 * Search for an interface by index. Returns %NULL if the device
753 * is not found or a pointer to the device. The device has not
754 * had its reference counter increased so the caller must be careful
755 * about locking. The caller must hold RCU lock.
758 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
760 struct net_device
*dev
;
761 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
763 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
764 if (dev
->ifindex
== ifindex
)
769 EXPORT_SYMBOL(dev_get_by_index_rcu
);
773 * dev_get_by_index - find a device by its ifindex
774 * @net: the applicable net namespace
775 * @ifindex: index of device
777 * Search for an interface by index. Returns NULL if the device
778 * is not found or a pointer to the device. The device returned has
779 * had a reference added and the pointer is safe until the user calls
780 * dev_put to indicate they have finished with it.
783 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
785 struct net_device
*dev
;
788 dev
= dev_get_by_index_rcu(net
, ifindex
);
794 EXPORT_SYMBOL(dev_get_by_index
);
797 * dev_getbyhwaddr_rcu - find a device by its hardware address
798 * @net: the applicable net namespace
799 * @type: media type of device
800 * @ha: hardware address
802 * Search for an interface by MAC address. Returns NULL if the device
803 * is not found or a pointer to the device.
804 * The caller must hold RCU or RTNL.
805 * The returned device has not had its ref count increased
806 * and the caller must therefore be careful about locking
810 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
813 struct net_device
*dev
;
815 for_each_netdev_rcu(net
, dev
)
816 if (dev
->type
== type
&&
817 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
822 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
824 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
826 struct net_device
*dev
;
829 for_each_netdev(net
, dev
)
830 if (dev
->type
== type
)
835 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
837 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
839 struct net_device
*dev
, *ret
= NULL
;
842 for_each_netdev_rcu(net
, dev
)
843 if (dev
->type
== type
) {
851 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
854 * dev_get_by_flags_rcu - find any device with given flags
855 * @net: the applicable net namespace
856 * @if_flags: IFF_* values
857 * @mask: bitmask of bits in if_flags to check
859 * Search for any interface with the given flags. Returns NULL if a device
860 * is not found or a pointer to the device. Must be called inside
861 * rcu_read_lock(), and result refcount is unchanged.
864 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
867 struct net_device
*dev
, *ret
;
870 for_each_netdev_rcu(net
, dev
) {
871 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
878 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
881 * dev_valid_name - check if name is okay for network device
884 * Network device names need to be valid file names to
885 * to allow sysfs to work. We also disallow any kind of
888 bool dev_valid_name(const char *name
)
892 if (strlen(name
) >= IFNAMSIZ
)
894 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
898 if (*name
== '/' || isspace(*name
))
904 EXPORT_SYMBOL(dev_valid_name
);
907 * __dev_alloc_name - allocate a name for a device
908 * @net: network namespace to allocate the device name in
909 * @name: name format string
910 * @buf: scratch buffer and result name string
912 * Passed a format string - eg "lt%d" it will try and find a suitable
913 * id. It scans list of devices to build up a free map, then chooses
914 * the first empty slot. The caller must hold the dev_base or rtnl lock
915 * while allocating the name and adding the device in order to avoid
917 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
918 * Returns the number of the unit assigned or a negative errno code.
921 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
925 const int max_netdevices
= 8*PAGE_SIZE
;
926 unsigned long *inuse
;
927 struct net_device
*d
;
929 p
= strnchr(name
, IFNAMSIZ
-1, '%');
932 * Verify the string as this thing may have come from
933 * the user. There must be either one "%d" and no other "%"
936 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
939 /* Use one page as a bit array of possible slots */
940 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
944 for_each_netdev(net
, d
) {
945 if (!sscanf(d
->name
, name
, &i
))
947 if (i
< 0 || i
>= max_netdevices
)
950 /* avoid cases where sscanf is not exact inverse of printf */
951 snprintf(buf
, IFNAMSIZ
, name
, i
);
952 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
956 i
= find_first_zero_bit(inuse
, max_netdevices
);
957 free_page((unsigned long) inuse
);
961 snprintf(buf
, IFNAMSIZ
, name
, i
);
962 if (!__dev_get_by_name(net
, buf
))
965 /* It is possible to run out of possible slots
966 * when the name is long and there isn't enough space left
967 * for the digits, or if all bits are used.
973 * dev_alloc_name - allocate a name for a device
975 * @name: name format string
977 * Passed a format string - eg "lt%d" it will try and find a suitable
978 * id. It scans list of devices to build up a free map, then chooses
979 * the first empty slot. The caller must hold the dev_base or rtnl lock
980 * while allocating the name and adding the device in order to avoid
982 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
983 * Returns the number of the unit assigned or a negative errno code.
986 int dev_alloc_name(struct net_device
*dev
, const char *name
)
992 BUG_ON(!dev_net(dev
));
994 ret
= __dev_alloc_name(net
, name
, buf
);
996 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
999 EXPORT_SYMBOL(dev_alloc_name
);
1001 static int dev_alloc_name_ns(struct net
*net
,
1002 struct net_device
*dev
,
1008 ret
= __dev_alloc_name(net
, name
, buf
);
1010 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1014 static int dev_get_valid_name(struct net
*net
,
1015 struct net_device
*dev
,
1020 if (!dev_valid_name(name
))
1023 if (strchr(name
, '%'))
1024 return dev_alloc_name_ns(net
, dev
, name
);
1025 else if (__dev_get_by_name(net
, name
))
1027 else if (dev
->name
!= name
)
1028 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1034 * dev_change_name - change name of a device
1036 * @newname: name (or format string) must be at least IFNAMSIZ
1038 * Change name of a device, can pass format strings "eth%d".
1041 int dev_change_name(struct net_device
*dev
, const char *newname
)
1043 char oldname
[IFNAMSIZ
];
1049 BUG_ON(!dev_net(dev
));
1052 if (dev
->flags
& IFF_UP
)
1055 write_seqcount_begin(&devnet_rename_seq
);
1057 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1058 write_seqcount_end(&devnet_rename_seq
);
1062 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1064 err
= dev_get_valid_name(net
, dev
, newname
);
1066 write_seqcount_end(&devnet_rename_seq
);
1071 ret
= device_rename(&dev
->dev
, dev
->name
);
1073 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1074 write_seqcount_end(&devnet_rename_seq
);
1078 write_seqcount_end(&devnet_rename_seq
);
1080 write_lock_bh(&dev_base_lock
);
1081 hlist_del_rcu(&dev
->name_hlist
);
1082 write_unlock_bh(&dev_base_lock
);
1086 write_lock_bh(&dev_base_lock
);
1087 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1088 write_unlock_bh(&dev_base_lock
);
1090 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1091 ret
= notifier_to_errno(ret
);
1094 /* err >= 0 after dev_alloc_name() or stores the first errno */
1097 write_seqcount_begin(&devnet_rename_seq
);
1098 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1101 pr_err("%s: name change rollback failed: %d\n",
1110 * dev_set_alias - change ifalias of a device
1112 * @alias: name up to IFALIASZ
1113 * @len: limit of bytes to copy from info
1115 * Set ifalias for a device,
1117 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1123 if (len
>= IFALIASZ
)
1127 kfree(dev
->ifalias
);
1128 dev
->ifalias
= NULL
;
1132 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1135 dev
->ifalias
= new_ifalias
;
1137 strlcpy(dev
->ifalias
, alias
, len
+1);
1143 * netdev_features_change - device changes features
1144 * @dev: device to cause notification
1146 * Called to indicate a device has changed features.
1148 void netdev_features_change(struct net_device
*dev
)
1150 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1152 EXPORT_SYMBOL(netdev_features_change
);
1155 * netdev_state_change - device changes state
1156 * @dev: device to cause notification
1158 * Called to indicate a device has changed state. This function calls
1159 * the notifier chains for netdev_chain and sends a NEWLINK message
1160 * to the routing socket.
1162 void netdev_state_change(struct net_device
*dev
)
1164 if (dev
->flags
& IFF_UP
) {
1165 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1166 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1169 EXPORT_SYMBOL(netdev_state_change
);
1172 * netdev_notify_peers - notify network peers about existence of @dev
1173 * @dev: network device
1175 * Generate traffic such that interested network peers are aware of
1176 * @dev, such as by generating a gratuitous ARP. This may be used when
1177 * a device wants to inform the rest of the network about some sort of
1178 * reconfiguration such as a failover event or virtual machine
1181 void netdev_notify_peers(struct net_device
*dev
)
1184 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1187 EXPORT_SYMBOL(netdev_notify_peers
);
1189 static int __dev_open(struct net_device
*dev
)
1191 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1196 if (!netif_device_present(dev
))
1199 /* Block netpoll from trying to do any rx path servicing.
1200 * If we don't do this there is a chance ndo_poll_controller
1201 * or ndo_poll may be running while we open the device
1203 ret
= netpoll_rx_disable(dev
);
1207 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1208 ret
= notifier_to_errno(ret
);
1212 set_bit(__LINK_STATE_START
, &dev
->state
);
1214 if (ops
->ndo_validate_addr
)
1215 ret
= ops
->ndo_validate_addr(dev
);
1217 if (!ret
&& ops
->ndo_open
)
1218 ret
= ops
->ndo_open(dev
);
1220 netpoll_rx_enable(dev
);
1223 clear_bit(__LINK_STATE_START
, &dev
->state
);
1225 dev
->flags
|= IFF_UP
;
1226 net_dmaengine_get();
1227 dev_set_rx_mode(dev
);
1229 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1236 * dev_open - prepare an interface for use.
1237 * @dev: device to open
1239 * Takes a device from down to up state. The device's private open
1240 * function is invoked and then the multicast lists are loaded. Finally
1241 * the device is moved into the up state and a %NETDEV_UP message is
1242 * sent to the netdev notifier chain.
1244 * Calling this function on an active interface is a nop. On a failure
1245 * a negative errno code is returned.
1247 int dev_open(struct net_device
*dev
)
1251 if (dev
->flags
& IFF_UP
)
1254 ret
= __dev_open(dev
);
1258 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1259 call_netdevice_notifiers(NETDEV_UP
, dev
);
1263 EXPORT_SYMBOL(dev_open
);
1265 static int __dev_close_many(struct list_head
*head
)
1267 struct net_device
*dev
;
1272 list_for_each_entry(dev
, head
, unreg_list
) {
1273 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1275 clear_bit(__LINK_STATE_START
, &dev
->state
);
1277 /* Synchronize to scheduled poll. We cannot touch poll list, it
1278 * can be even on different cpu. So just clear netif_running().
1280 * dev->stop() will invoke napi_disable() on all of it's
1281 * napi_struct instances on this device.
1283 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1286 dev_deactivate_many(head
);
1288 list_for_each_entry(dev
, head
, unreg_list
) {
1289 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1292 * Call the device specific close. This cannot fail.
1293 * Only if device is UP
1295 * We allow it to be called even after a DETACH hot-plug
1301 dev
->flags
&= ~IFF_UP
;
1302 net_dmaengine_put();
1308 static int __dev_close(struct net_device
*dev
)
1313 /* Temporarily disable netpoll until the interface is down */
1314 retval
= netpoll_rx_disable(dev
);
1318 list_add(&dev
->unreg_list
, &single
);
1319 retval
= __dev_close_many(&single
);
1322 netpoll_rx_enable(dev
);
1326 static int dev_close_many(struct list_head
*head
)
1328 struct net_device
*dev
, *tmp
;
1329 LIST_HEAD(tmp_list
);
1331 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
)
1332 if (!(dev
->flags
& IFF_UP
))
1333 list_move(&dev
->unreg_list
, &tmp_list
);
1335 __dev_close_many(head
);
1337 list_for_each_entry(dev
, head
, unreg_list
) {
1338 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1339 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1342 /* rollback_registered_many needs the complete original list */
1343 list_splice(&tmp_list
, head
);
1348 * dev_close - shutdown an interface.
1349 * @dev: device to shutdown
1351 * This function moves an active device into down state. A
1352 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1353 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1356 int dev_close(struct net_device
*dev
)
1359 if (dev
->flags
& IFF_UP
) {
1362 /* Block netpoll rx while the interface is going down */
1363 ret
= netpoll_rx_disable(dev
);
1367 list_add(&dev
->unreg_list
, &single
);
1368 dev_close_many(&single
);
1371 netpoll_rx_enable(dev
);
1375 EXPORT_SYMBOL(dev_close
);
1379 * dev_disable_lro - disable Large Receive Offload on a device
1382 * Disable Large Receive Offload (LRO) on a net device. Must be
1383 * called under RTNL. This is needed if received packets may be
1384 * forwarded to another interface.
1386 void dev_disable_lro(struct net_device
*dev
)
1389 * If we're trying to disable lro on a vlan device
1390 * use the underlying physical device instead
1392 if (is_vlan_dev(dev
))
1393 dev
= vlan_dev_real_dev(dev
);
1395 dev
->wanted_features
&= ~NETIF_F_LRO
;
1396 netdev_update_features(dev
);
1398 if (unlikely(dev
->features
& NETIF_F_LRO
))
1399 netdev_WARN(dev
, "failed to disable LRO!\n");
1401 EXPORT_SYMBOL(dev_disable_lro
);
1404 static int dev_boot_phase
= 1;
1407 * register_netdevice_notifier - register a network notifier block
1410 * Register a notifier to be called when network device events occur.
1411 * The notifier passed is linked into the kernel structures and must
1412 * not be reused until it has been unregistered. A negative errno code
1413 * is returned on a failure.
1415 * When registered all registration and up events are replayed
1416 * to the new notifier to allow device to have a race free
1417 * view of the network device list.
1420 int register_netdevice_notifier(struct notifier_block
*nb
)
1422 struct net_device
*dev
;
1423 struct net_device
*last
;
1428 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1434 for_each_netdev(net
, dev
) {
1435 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1436 err
= notifier_to_errno(err
);
1440 if (!(dev
->flags
& IFF_UP
))
1443 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1454 for_each_netdev(net
, dev
) {
1458 if (dev
->flags
& IFF_UP
) {
1459 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1460 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1462 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1467 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1470 EXPORT_SYMBOL(register_netdevice_notifier
);
1473 * unregister_netdevice_notifier - unregister a network notifier block
1476 * Unregister a notifier previously registered by
1477 * register_netdevice_notifier(). The notifier is unlinked into the
1478 * kernel structures and may then be reused. A negative errno code
1479 * is returned on a failure.
1481 * After unregistering unregister and down device events are synthesized
1482 * for all devices on the device list to the removed notifier to remove
1483 * the need for special case cleanup code.
1486 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1488 struct net_device
*dev
;
1493 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1498 for_each_netdev(net
, dev
) {
1499 if (dev
->flags
& IFF_UP
) {
1500 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1501 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1503 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1510 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1513 * call_netdevice_notifiers - call all network notifier blocks
1514 * @val: value passed unmodified to notifier function
1515 * @dev: net_device pointer passed unmodified to notifier function
1517 * Call all network notifier blocks. Parameters and return value
1518 * are as for raw_notifier_call_chain().
1521 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1524 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1526 EXPORT_SYMBOL(call_netdevice_notifiers
);
1528 static struct static_key netstamp_needed __read_mostly
;
1529 #ifdef HAVE_JUMP_LABEL
1530 /* We are not allowed to call static_key_slow_dec() from irq context
1531 * If net_disable_timestamp() is called from irq context, defer the
1532 * static_key_slow_dec() calls.
1534 static atomic_t netstamp_needed_deferred
;
1537 void net_enable_timestamp(void)
1539 #ifdef HAVE_JUMP_LABEL
1540 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1544 static_key_slow_dec(&netstamp_needed
);
1548 WARN_ON(in_interrupt());
1549 static_key_slow_inc(&netstamp_needed
);
1551 EXPORT_SYMBOL(net_enable_timestamp
);
1553 void net_disable_timestamp(void)
1555 #ifdef HAVE_JUMP_LABEL
1556 if (in_interrupt()) {
1557 atomic_inc(&netstamp_needed_deferred
);
1561 static_key_slow_dec(&netstamp_needed
);
1563 EXPORT_SYMBOL(net_disable_timestamp
);
1565 static inline void net_timestamp_set(struct sk_buff
*skb
)
1567 skb
->tstamp
.tv64
= 0;
1568 if (static_key_false(&netstamp_needed
))
1569 __net_timestamp(skb
);
1572 #define net_timestamp_check(COND, SKB) \
1573 if (static_key_false(&netstamp_needed)) { \
1574 if ((COND) && !(SKB)->tstamp.tv64) \
1575 __net_timestamp(SKB); \
1578 static inline bool is_skb_forwardable(struct net_device *dev,
1579 struct sk_buff
*skb
)
1583 if (!(dev
->flags
& IFF_UP
))
1586 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1587 if (skb
->len
<= len
)
1590 /* if TSO is enabled, we don't care about the length as the packet
1591 * could be forwarded without being segmented before
1593 if (skb_is_gso(skb
))
1600 * dev_forward_skb - loopback an skb to another netif
1602 * @dev: destination network device
1603 * @skb: buffer to forward
1606 * NET_RX_SUCCESS (no congestion)
1607 * NET_RX_DROP (packet was dropped, but freed)
1609 * dev_forward_skb can be used for injecting an skb from the
1610 * start_xmit function of one device into the receive queue
1611 * of another device.
1613 * The receiving device may be in another namespace, so
1614 * we have to clear all information in the skb that could
1615 * impact namespace isolation.
1617 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1619 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1620 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1621 atomic_long_inc(&dev
->rx_dropped
);
1630 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1631 atomic_long_inc(&dev
->rx_dropped
);
1638 skb
->tstamp
.tv64
= 0;
1639 skb
->pkt_type
= PACKET_HOST
;
1640 skb
->protocol
= eth_type_trans(skb
, dev
);
1644 return netif_rx(skb
);
1646 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1648 static inline int deliver_skb(struct sk_buff
*skb
,
1649 struct packet_type
*pt_prev
,
1650 struct net_device
*orig_dev
)
1652 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1654 atomic_inc(&skb
->users
);
1655 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1658 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1660 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1663 if (ptype
->id_match
)
1664 return ptype
->id_match(ptype
, skb
->sk
);
1665 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1672 * Support routine. Sends outgoing frames to any network
1673 * taps currently in use.
1676 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1678 struct packet_type
*ptype
;
1679 struct sk_buff
*skb2
= NULL
;
1680 struct packet_type
*pt_prev
= NULL
;
1683 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1684 /* Never send packets back to the socket
1685 * they originated from - MvS (miquels@drinkel.ow.org)
1687 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1688 (!skb_loop_sk(ptype
, skb
))) {
1690 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1695 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1699 net_timestamp_set(skb2
);
1701 /* skb->nh should be correctly
1702 set by sender, so that the second statement is
1703 just protection against buggy protocols.
1705 skb_reset_mac_header(skb2
);
1707 if (skb_network_header(skb2
) < skb2
->data
||
1708 skb2
->network_header
> skb2
->tail
) {
1709 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1710 ntohs(skb2
->protocol
),
1712 skb_reset_network_header(skb2
);
1715 skb2
->transport_header
= skb2
->network_header
;
1716 skb2
->pkt_type
= PACKET_OUTGOING
;
1721 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1726 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1727 * @dev: Network device
1728 * @txq: number of queues available
1730 * If real_num_tx_queues is changed the tc mappings may no longer be
1731 * valid. To resolve this verify the tc mapping remains valid and if
1732 * not NULL the mapping. With no priorities mapping to this
1733 * offset/count pair it will no longer be used. In the worst case TC0
1734 * is invalid nothing can be done so disable priority mappings. If is
1735 * expected that drivers will fix this mapping if they can before
1736 * calling netif_set_real_num_tx_queues.
1738 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1741 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1743 /* If TC0 is invalidated disable TC mapping */
1744 if (tc
->offset
+ tc
->count
> txq
) {
1745 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1750 /* Invalidated prio to tc mappings set to TC0 */
1751 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1752 int q
= netdev_get_prio_tc_map(dev
, i
);
1754 tc
= &dev
->tc_to_txq
[q
];
1755 if (tc
->offset
+ tc
->count
> txq
) {
1756 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1758 netdev_set_prio_tc_map(dev
, i
, 0);
1764 static DEFINE_MUTEX(xps_map_mutex
);
1765 #define xmap_dereference(P) \
1766 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1768 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1771 struct xps_map
*map
= NULL
;
1775 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1777 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1778 if (map
->queues
[pos
] == index
) {
1780 map
->queues
[pos
] = map
->queues
[--map
->len
];
1782 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1783 kfree_rcu(map
, rcu
);
1793 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1795 struct xps_dev_maps
*dev_maps
;
1797 bool active
= false;
1799 mutex_lock(&xps_map_mutex
);
1800 dev_maps
= xmap_dereference(dev
->xps_maps
);
1805 for_each_possible_cpu(cpu
) {
1806 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1807 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1810 if (i
== dev
->num_tx_queues
)
1815 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1816 kfree_rcu(dev_maps
, rcu
);
1819 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1820 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1824 mutex_unlock(&xps_map_mutex
);
1827 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1830 struct xps_map
*new_map
;
1831 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1834 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1835 if (map
->queues
[pos
] != index
)
1840 /* Need to add queue to this CPU's existing map */
1842 if (pos
< map
->alloc_len
)
1845 alloc_len
= map
->alloc_len
* 2;
1848 /* Need to allocate new map to store queue on this CPU's map */
1849 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1854 for (i
= 0; i
< pos
; i
++)
1855 new_map
->queues
[i
] = map
->queues
[i
];
1856 new_map
->alloc_len
= alloc_len
;
1862 int netif_set_xps_queue(struct net_device
*dev
, struct cpumask
*mask
, u16 index
)
1864 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1865 struct xps_map
*map
, *new_map
;
1866 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1867 int cpu
, numa_node_id
= -2;
1868 bool active
= false;
1870 mutex_lock(&xps_map_mutex
);
1872 dev_maps
= xmap_dereference(dev
->xps_maps
);
1874 /* allocate memory for queue storage */
1875 for_each_online_cpu(cpu
) {
1876 if (!cpumask_test_cpu(cpu
, mask
))
1880 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
1881 if (!new_dev_maps
) {
1882 mutex_unlock(&xps_map_mutex
);
1886 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1889 map
= expand_xps_map(map
, cpu
, index
);
1893 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1897 goto out_no_new_maps
;
1899 for_each_possible_cpu(cpu
) {
1900 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
1901 /* add queue to CPU maps */
1904 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1905 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
1908 if (pos
== map
->len
)
1909 map
->queues
[map
->len
++] = index
;
1911 if (numa_node_id
== -2)
1912 numa_node_id
= cpu_to_node(cpu
);
1913 else if (numa_node_id
!= cpu_to_node(cpu
))
1916 } else if (dev_maps
) {
1917 /* fill in the new device map from the old device map */
1918 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1919 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1924 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
1926 /* Cleanup old maps */
1928 for_each_possible_cpu(cpu
) {
1929 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1930 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1931 if (map
&& map
!= new_map
)
1932 kfree_rcu(map
, rcu
);
1935 kfree_rcu(dev_maps
, rcu
);
1938 dev_maps
= new_dev_maps
;
1942 /* update Tx queue numa node */
1943 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
1944 (numa_node_id
>= 0) ? numa_node_id
:
1950 /* removes queue from unused CPUs */
1951 for_each_possible_cpu(cpu
) {
1952 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
1955 if (remove_xps_queue(dev_maps
, cpu
, index
))
1959 /* free map if not active */
1961 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1962 kfree_rcu(dev_maps
, rcu
);
1966 mutex_unlock(&xps_map_mutex
);
1970 /* remove any maps that we added */
1971 for_each_possible_cpu(cpu
) {
1972 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1973 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1975 if (new_map
&& new_map
!= map
)
1979 mutex_unlock(&xps_map_mutex
);
1981 kfree(new_dev_maps
);
1984 EXPORT_SYMBOL(netif_set_xps_queue
);
1988 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1989 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1991 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
1995 if (txq
< 1 || txq
> dev
->num_tx_queues
)
1998 if (dev
->reg_state
== NETREG_REGISTERED
||
1999 dev
->reg_state
== NETREG_UNREGISTERING
) {
2002 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2008 netif_setup_tc(dev
, txq
);
2010 if (txq
< dev
->real_num_tx_queues
) {
2011 qdisc_reset_all_tx_gt(dev
, txq
);
2013 netif_reset_xps_queues_gt(dev
, txq
);
2018 dev
->real_num_tx_queues
= txq
;
2021 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2025 * netif_set_real_num_rx_queues - set actual number of RX queues used
2026 * @dev: Network device
2027 * @rxq: Actual number of RX queues
2029 * This must be called either with the rtnl_lock held or before
2030 * registration of the net device. Returns 0 on success, or a
2031 * negative error code. If called before registration, it always
2034 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2038 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2041 if (dev
->reg_state
== NETREG_REGISTERED
) {
2044 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2050 dev
->real_num_rx_queues
= rxq
;
2053 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2057 * netif_get_num_default_rss_queues - default number of RSS queues
2059 * This routine should set an upper limit on the number of RSS queues
2060 * used by default by multiqueue devices.
2062 int netif_get_num_default_rss_queues(void)
2064 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2066 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2068 static inline void __netif_reschedule(struct Qdisc
*q
)
2070 struct softnet_data
*sd
;
2071 unsigned long flags
;
2073 local_irq_save(flags
);
2074 sd
= &__get_cpu_var(softnet_data
);
2075 q
->next_sched
= NULL
;
2076 *sd
->output_queue_tailp
= q
;
2077 sd
->output_queue_tailp
= &q
->next_sched
;
2078 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2079 local_irq_restore(flags
);
2082 void __netif_schedule(struct Qdisc
*q
)
2084 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2085 __netif_reschedule(q
);
2087 EXPORT_SYMBOL(__netif_schedule
);
2089 void dev_kfree_skb_irq(struct sk_buff
*skb
)
2091 if (atomic_dec_and_test(&skb
->users
)) {
2092 struct softnet_data
*sd
;
2093 unsigned long flags
;
2095 local_irq_save(flags
);
2096 sd
= &__get_cpu_var(softnet_data
);
2097 skb
->next
= sd
->completion_queue
;
2098 sd
->completion_queue
= skb
;
2099 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2100 local_irq_restore(flags
);
2103 EXPORT_SYMBOL(dev_kfree_skb_irq
);
2105 void dev_kfree_skb_any(struct sk_buff
*skb
)
2107 if (in_irq() || irqs_disabled())
2108 dev_kfree_skb_irq(skb
);
2112 EXPORT_SYMBOL(dev_kfree_skb_any
);
2116 * netif_device_detach - mark device as removed
2117 * @dev: network device
2119 * Mark device as removed from system and therefore no longer available.
2121 void netif_device_detach(struct net_device
*dev
)
2123 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2124 netif_running(dev
)) {
2125 netif_tx_stop_all_queues(dev
);
2128 EXPORT_SYMBOL(netif_device_detach
);
2131 * netif_device_attach - mark device as attached
2132 * @dev: network device
2134 * Mark device as attached from system and restart if needed.
2136 void netif_device_attach(struct net_device
*dev
)
2138 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2139 netif_running(dev
)) {
2140 netif_tx_wake_all_queues(dev
);
2141 __netdev_watchdog_up(dev
);
2144 EXPORT_SYMBOL(netif_device_attach
);
2146 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2148 static const netdev_features_t null_features
= 0;
2149 struct net_device
*dev
= skb
->dev
;
2150 const char *driver
= "";
2152 if (dev
&& dev
->dev
.parent
)
2153 driver
= dev_driver_string(dev
->dev
.parent
);
2155 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2156 "gso_type=%d ip_summed=%d\n",
2157 driver
, dev
? &dev
->features
: &null_features
,
2158 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2159 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2160 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2164 * Invalidate hardware checksum when packet is to be mangled, and
2165 * complete checksum manually on outgoing path.
2167 int skb_checksum_help(struct sk_buff
*skb
)
2170 int ret
= 0, offset
;
2172 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2173 goto out_set_summed
;
2175 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2176 skb_warn_bad_offload(skb
);
2180 /* Before computing a checksum, we should make sure no frag could
2181 * be modified by an external entity : checksum could be wrong.
2183 if (skb_has_shared_frag(skb
)) {
2184 ret
= __skb_linearize(skb
);
2189 offset
= skb_checksum_start_offset(skb
);
2190 BUG_ON(offset
>= skb_headlen(skb
));
2191 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2193 offset
+= skb
->csum_offset
;
2194 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2196 if (skb_cloned(skb
) &&
2197 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2198 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2203 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2205 skb
->ip_summed
= CHECKSUM_NONE
;
2209 EXPORT_SYMBOL(skb_checksum_help
);
2212 * skb_mac_gso_segment - mac layer segmentation handler.
2213 * @skb: buffer to segment
2214 * @features: features for the output path (see dev->features)
2216 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2217 netdev_features_t features
)
2219 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2220 struct packet_offload
*ptype
;
2221 __be16 type
= skb
->protocol
;
2223 while (type
== htons(ETH_P_8021Q
)) {
2224 int vlan_depth
= ETH_HLEN
;
2225 struct vlan_hdr
*vh
;
2227 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
2228 return ERR_PTR(-EINVAL
);
2230 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2231 type
= vh
->h_vlan_encapsulated_proto
;
2232 vlan_depth
+= VLAN_HLEN
;
2235 __skb_pull(skb
, skb
->mac_len
);
2238 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2239 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2240 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2243 err
= ptype
->callbacks
.gso_send_check(skb
);
2244 segs
= ERR_PTR(err
);
2245 if (err
|| skb_gso_ok(skb
, features
))
2247 __skb_push(skb
, (skb
->data
-
2248 skb_network_header(skb
)));
2250 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2256 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2260 EXPORT_SYMBOL(skb_mac_gso_segment
);
2263 /* openvswitch calls this on rx path, so we need a different check.
2265 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2268 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2270 return skb
->ip_summed
== CHECKSUM_NONE
;
2274 * __skb_gso_segment - Perform segmentation on skb.
2275 * @skb: buffer to segment
2276 * @features: features for the output path (see dev->features)
2277 * @tx_path: whether it is called in TX path
2279 * This function segments the given skb and returns a list of segments.
2281 * It may return NULL if the skb requires no segmentation. This is
2282 * only possible when GSO is used for verifying header integrity.
2284 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2285 netdev_features_t features
, bool tx_path
)
2287 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2290 skb_warn_bad_offload(skb
);
2292 if (skb_header_cloned(skb
) &&
2293 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2294 return ERR_PTR(err
);
2297 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2298 skb_reset_mac_header(skb
);
2299 skb_reset_mac_len(skb
);
2301 return skb_mac_gso_segment(skb
, features
);
2303 EXPORT_SYMBOL(__skb_gso_segment
);
2305 /* Take action when hardware reception checksum errors are detected. */
2307 void netdev_rx_csum_fault(struct net_device
*dev
)
2309 if (net_ratelimit()) {
2310 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2314 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2317 /* Actually, we should eliminate this check as soon as we know, that:
2318 * 1. IOMMU is present and allows to map all the memory.
2319 * 2. No high memory really exists on this machine.
2322 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2324 #ifdef CONFIG_HIGHMEM
2326 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2327 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2328 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2329 if (PageHighMem(skb_frag_page(frag
)))
2334 if (PCI_DMA_BUS_IS_PHYS
) {
2335 struct device
*pdev
= dev
->dev
.parent
;
2339 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2340 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2341 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2342 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2351 void (*destructor
)(struct sk_buff
*skb
);
2354 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2356 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2358 struct dev_gso_cb
*cb
;
2361 struct sk_buff
*nskb
= skb
->next
;
2363 skb
->next
= nskb
->next
;
2366 } while (skb
->next
);
2368 cb
= DEV_GSO_CB(skb
);
2370 cb
->destructor(skb
);
2374 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2375 * @skb: buffer to segment
2376 * @features: device features as applicable to this skb
2378 * This function segments the given skb and stores the list of segments
2381 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2383 struct sk_buff
*segs
;
2385 segs
= skb_gso_segment(skb
, features
);
2387 /* Verifying header integrity only. */
2392 return PTR_ERR(segs
);
2395 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2396 skb
->destructor
= dev_gso_skb_destructor
;
2401 static bool can_checksum_protocol(netdev_features_t features
, __be16 protocol
)
2403 return ((features
& NETIF_F_GEN_CSUM
) ||
2404 ((features
& NETIF_F_V4_CSUM
) &&
2405 protocol
== htons(ETH_P_IP
)) ||
2406 ((features
& NETIF_F_V6_CSUM
) &&
2407 protocol
== htons(ETH_P_IPV6
)) ||
2408 ((features
& NETIF_F_FCOE_CRC
) &&
2409 protocol
== htons(ETH_P_FCOE
)));
2412 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2413 __be16 protocol
, netdev_features_t features
)
2415 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2416 !can_checksum_protocol(features
, protocol
)) {
2417 features
&= ~NETIF_F_ALL_CSUM
;
2418 features
&= ~NETIF_F_SG
;
2419 } else if (illegal_highdma(skb
->dev
, skb
)) {
2420 features
&= ~NETIF_F_SG
;
2426 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2428 __be16 protocol
= skb
->protocol
;
2429 netdev_features_t features
= skb
->dev
->features
;
2431 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2432 features
&= ~NETIF_F_GSO_MASK
;
2434 if (protocol
== htons(ETH_P_8021Q
)) {
2435 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2436 protocol
= veh
->h_vlan_encapsulated_proto
;
2437 } else if (!vlan_tx_tag_present(skb
)) {
2438 return harmonize_features(skb
, protocol
, features
);
2441 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_TX
);
2443 if (protocol
!= htons(ETH_P_8021Q
)) {
2444 return harmonize_features(skb
, protocol
, features
);
2446 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2447 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_TX
;
2448 return harmonize_features(skb
, protocol
, features
);
2451 EXPORT_SYMBOL(netif_skb_features
);
2454 * Returns true if either:
2455 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2456 * 2. skb is fragmented and the device does not support SG.
2458 static inline int skb_needs_linearize(struct sk_buff
*skb
,
2461 return skb_is_nonlinear(skb
) &&
2462 ((skb_has_frag_list(skb
) &&
2463 !(features
& NETIF_F_FRAGLIST
)) ||
2464 (skb_shinfo(skb
)->nr_frags
&&
2465 !(features
& NETIF_F_SG
)));
2468 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2469 struct netdev_queue
*txq
)
2471 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2472 int rc
= NETDEV_TX_OK
;
2473 unsigned int skb_len
;
2475 if (likely(!skb
->next
)) {
2476 netdev_features_t features
;
2479 * If device doesn't need skb->dst, release it right now while
2480 * its hot in this cpu cache
2482 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2485 features
= netif_skb_features(skb
);
2487 if (vlan_tx_tag_present(skb
) &&
2488 !(features
& NETIF_F_HW_VLAN_TX
)) {
2489 skb
= __vlan_put_tag(skb
, vlan_tx_tag_get(skb
));
2496 /* If encapsulation offload request, verify we are testing
2497 * hardware encapsulation features instead of standard
2498 * features for the netdev
2500 if (skb
->encapsulation
)
2501 features
&= dev
->hw_enc_features
;
2503 if (netif_needs_gso(skb
, features
)) {
2504 if (unlikely(dev_gso_segment(skb
, features
)))
2509 if (skb_needs_linearize(skb
, features
) &&
2510 __skb_linearize(skb
))
2513 /* If packet is not checksummed and device does not
2514 * support checksumming for this protocol, complete
2515 * checksumming here.
2517 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2518 if (skb
->encapsulation
)
2519 skb_set_inner_transport_header(skb
,
2520 skb_checksum_start_offset(skb
));
2522 skb_set_transport_header(skb
,
2523 skb_checksum_start_offset(skb
));
2524 if (!(features
& NETIF_F_ALL_CSUM
) &&
2525 skb_checksum_help(skb
))
2530 if (!list_empty(&ptype_all
))
2531 dev_queue_xmit_nit(skb
, dev
);
2534 rc
= ops
->ndo_start_xmit(skb
, dev
);
2535 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2536 if (rc
== NETDEV_TX_OK
)
2537 txq_trans_update(txq
);
2543 struct sk_buff
*nskb
= skb
->next
;
2545 skb
->next
= nskb
->next
;
2549 * If device doesn't need nskb->dst, release it right now while
2550 * its hot in this cpu cache
2552 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2555 if (!list_empty(&ptype_all
))
2556 dev_queue_xmit_nit(nskb
, dev
);
2558 skb_len
= nskb
->len
;
2559 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2560 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2561 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2562 if (rc
& ~NETDEV_TX_MASK
)
2563 goto out_kfree_gso_skb
;
2564 nskb
->next
= skb
->next
;
2568 txq_trans_update(txq
);
2569 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2570 return NETDEV_TX_BUSY
;
2571 } while (skb
->next
);
2574 if (likely(skb
->next
== NULL
))
2575 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2582 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2584 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2586 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2588 /* To get more precise estimation of bytes sent on wire,
2589 * we add to pkt_len the headers size of all segments
2591 if (shinfo
->gso_size
) {
2592 unsigned int hdr_len
;
2594 /* mac layer + network layer */
2595 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2597 /* + transport layer */
2598 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2599 hdr_len
+= tcp_hdrlen(skb
);
2601 hdr_len
+= sizeof(struct udphdr
);
2602 qdisc_skb_cb(skb
)->pkt_len
+= (shinfo
->gso_segs
- 1) * hdr_len
;
2606 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2607 struct net_device
*dev
,
2608 struct netdev_queue
*txq
)
2610 spinlock_t
*root_lock
= qdisc_lock(q
);
2614 qdisc_pkt_len_init(skb
);
2615 qdisc_calculate_pkt_len(skb
, q
);
2617 * Heuristic to force contended enqueues to serialize on a
2618 * separate lock before trying to get qdisc main lock.
2619 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2620 * and dequeue packets faster.
2622 contended
= qdisc_is_running(q
);
2623 if (unlikely(contended
))
2624 spin_lock(&q
->busylock
);
2626 spin_lock(root_lock
);
2627 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2630 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2631 qdisc_run_begin(q
)) {
2633 * This is a work-conserving queue; there are no old skbs
2634 * waiting to be sent out; and the qdisc is not running -
2635 * xmit the skb directly.
2637 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2640 qdisc_bstats_update(q
, skb
);
2642 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2643 if (unlikely(contended
)) {
2644 spin_unlock(&q
->busylock
);
2651 rc
= NET_XMIT_SUCCESS
;
2654 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2655 if (qdisc_run_begin(q
)) {
2656 if (unlikely(contended
)) {
2657 spin_unlock(&q
->busylock
);
2663 spin_unlock(root_lock
);
2664 if (unlikely(contended
))
2665 spin_unlock(&q
->busylock
);
2669 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2670 static void skb_update_prio(struct sk_buff
*skb
)
2672 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2674 if (!skb
->priority
&& skb
->sk
&& map
) {
2675 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2677 if (prioidx
< map
->priomap_len
)
2678 skb
->priority
= map
->priomap
[prioidx
];
2682 #define skb_update_prio(skb)
2685 static DEFINE_PER_CPU(int, xmit_recursion
);
2686 #define RECURSION_LIMIT 10
2689 * dev_loopback_xmit - loop back @skb
2690 * @skb: buffer to transmit
2692 int dev_loopback_xmit(struct sk_buff
*skb
)
2694 skb_reset_mac_header(skb
);
2695 __skb_pull(skb
, skb_network_offset(skb
));
2696 skb
->pkt_type
= PACKET_LOOPBACK
;
2697 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2698 WARN_ON(!skb_dst(skb
));
2703 EXPORT_SYMBOL(dev_loopback_xmit
);
2706 * dev_queue_xmit - transmit a buffer
2707 * @skb: buffer to transmit
2709 * Queue a buffer for transmission to a network device. The caller must
2710 * have set the device and priority and built the buffer before calling
2711 * this function. The function can be called from an interrupt.
2713 * A negative errno code is returned on a failure. A success does not
2714 * guarantee the frame will be transmitted as it may be dropped due
2715 * to congestion or traffic shaping.
2717 * -----------------------------------------------------------------------------------
2718 * I notice this method can also return errors from the queue disciplines,
2719 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2722 * Regardless of the return value, the skb is consumed, so it is currently
2723 * difficult to retry a send to this method. (You can bump the ref count
2724 * before sending to hold a reference for retry if you are careful.)
2726 * When calling this method, interrupts MUST be enabled. This is because
2727 * the BH enable code must have IRQs enabled so that it will not deadlock.
2730 int dev_queue_xmit(struct sk_buff
*skb
)
2732 struct net_device
*dev
= skb
->dev
;
2733 struct netdev_queue
*txq
;
2737 skb_reset_mac_header(skb
);
2739 /* Disable soft irqs for various locks below. Also
2740 * stops preemption for RCU.
2744 skb_update_prio(skb
);
2746 txq
= netdev_pick_tx(dev
, skb
);
2747 q
= rcu_dereference_bh(txq
->qdisc
);
2749 #ifdef CONFIG_NET_CLS_ACT
2750 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2752 trace_net_dev_queue(skb
);
2754 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2758 /* The device has no queue. Common case for software devices:
2759 loopback, all the sorts of tunnels...
2761 Really, it is unlikely that netif_tx_lock protection is necessary
2762 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2764 However, it is possible, that they rely on protection
2767 Check this and shot the lock. It is not prone from deadlocks.
2768 Either shot noqueue qdisc, it is even simpler 8)
2770 if (dev
->flags
& IFF_UP
) {
2771 int cpu
= smp_processor_id(); /* ok because BHs are off */
2773 if (txq
->xmit_lock_owner
!= cpu
) {
2775 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2776 goto recursion_alert
;
2778 HARD_TX_LOCK(dev
, txq
, cpu
);
2780 if (!netif_xmit_stopped(txq
)) {
2781 __this_cpu_inc(xmit_recursion
);
2782 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2783 __this_cpu_dec(xmit_recursion
);
2784 if (dev_xmit_complete(rc
)) {
2785 HARD_TX_UNLOCK(dev
, txq
);
2789 HARD_TX_UNLOCK(dev
, txq
);
2790 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2793 /* Recursion is detected! It is possible,
2797 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2803 rcu_read_unlock_bh();
2808 rcu_read_unlock_bh();
2811 EXPORT_SYMBOL(dev_queue_xmit
);
2814 /*=======================================================================
2816 =======================================================================*/
2818 int netdev_max_backlog __read_mostly
= 1000;
2819 EXPORT_SYMBOL(netdev_max_backlog
);
2821 int netdev_tstamp_prequeue __read_mostly
= 1;
2822 int netdev_budget __read_mostly
= 300;
2823 int weight_p __read_mostly
= 64; /* old backlog weight */
2825 /* Called with irq disabled */
2826 static inline void ____napi_schedule(struct softnet_data
*sd
,
2827 struct napi_struct
*napi
)
2829 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2830 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2835 /* One global table that all flow-based protocols share. */
2836 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2837 EXPORT_SYMBOL(rps_sock_flow_table
);
2839 struct static_key rps_needed __read_mostly
;
2841 static struct rps_dev_flow
*
2842 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2843 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2845 if (next_cpu
!= RPS_NO_CPU
) {
2846 #ifdef CONFIG_RFS_ACCEL
2847 struct netdev_rx_queue
*rxqueue
;
2848 struct rps_dev_flow_table
*flow_table
;
2849 struct rps_dev_flow
*old_rflow
;
2854 /* Should we steer this flow to a different hardware queue? */
2855 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2856 !(dev
->features
& NETIF_F_NTUPLE
))
2858 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2859 if (rxq_index
== skb_get_rx_queue(skb
))
2862 rxqueue
= dev
->_rx
+ rxq_index
;
2863 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2866 flow_id
= skb
->rxhash
& flow_table
->mask
;
2867 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2868 rxq_index
, flow_id
);
2872 rflow
= &flow_table
->flows
[flow_id
];
2874 if (old_rflow
->filter
== rflow
->filter
)
2875 old_rflow
->filter
= RPS_NO_FILTER
;
2879 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2882 rflow
->cpu
= next_cpu
;
2887 * get_rps_cpu is called from netif_receive_skb and returns the target
2888 * CPU from the RPS map of the receiving queue for a given skb.
2889 * rcu_read_lock must be held on entry.
2891 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2892 struct rps_dev_flow
**rflowp
)
2894 struct netdev_rx_queue
*rxqueue
;
2895 struct rps_map
*map
;
2896 struct rps_dev_flow_table
*flow_table
;
2897 struct rps_sock_flow_table
*sock_flow_table
;
2901 if (skb_rx_queue_recorded(skb
)) {
2902 u16 index
= skb_get_rx_queue(skb
);
2903 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2904 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2905 "%s received packet on queue %u, but number "
2906 "of RX queues is %u\n",
2907 dev
->name
, index
, dev
->real_num_rx_queues
);
2910 rxqueue
= dev
->_rx
+ index
;
2914 map
= rcu_dereference(rxqueue
->rps_map
);
2916 if (map
->len
== 1 &&
2917 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2918 tcpu
= map
->cpus
[0];
2919 if (cpu_online(tcpu
))
2923 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2927 skb_reset_network_header(skb
);
2928 if (!skb_get_rxhash(skb
))
2931 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2932 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
2933 if (flow_table
&& sock_flow_table
) {
2935 struct rps_dev_flow
*rflow
;
2937 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
2940 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
2941 sock_flow_table
->mask
];
2944 * If the desired CPU (where last recvmsg was done) is
2945 * different from current CPU (one in the rx-queue flow
2946 * table entry), switch if one of the following holds:
2947 * - Current CPU is unset (equal to RPS_NO_CPU).
2948 * - Current CPU is offline.
2949 * - The current CPU's queue tail has advanced beyond the
2950 * last packet that was enqueued using this table entry.
2951 * This guarantees that all previous packets for the flow
2952 * have been dequeued, thus preserving in order delivery.
2954 if (unlikely(tcpu
!= next_cpu
) &&
2955 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
2956 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
2957 rflow
->last_qtail
)) >= 0)) {
2959 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
2962 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
2970 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
2972 if (cpu_online(tcpu
)) {
2982 #ifdef CONFIG_RFS_ACCEL
2985 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2986 * @dev: Device on which the filter was set
2987 * @rxq_index: RX queue index
2988 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2989 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2991 * Drivers that implement ndo_rx_flow_steer() should periodically call
2992 * this function for each installed filter and remove the filters for
2993 * which it returns %true.
2995 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
2996 u32 flow_id
, u16 filter_id
)
2998 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
2999 struct rps_dev_flow_table
*flow_table
;
3000 struct rps_dev_flow
*rflow
;
3005 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3006 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3007 rflow
= &flow_table
->flows
[flow_id
];
3008 cpu
= ACCESS_ONCE(rflow
->cpu
);
3009 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
3010 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3011 rflow
->last_qtail
) <
3012 (int)(10 * flow_table
->mask
)))
3018 EXPORT_SYMBOL(rps_may_expire_flow
);
3020 #endif /* CONFIG_RFS_ACCEL */
3022 /* Called from hardirq (IPI) context */
3023 static void rps_trigger_softirq(void *data
)
3025 struct softnet_data
*sd
= data
;
3027 ____napi_schedule(sd
, &sd
->backlog
);
3031 #endif /* CONFIG_RPS */
3034 * Check if this softnet_data structure is another cpu one
3035 * If yes, queue it to our IPI list and return 1
3038 static int rps_ipi_queued(struct softnet_data
*sd
)
3041 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
3044 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3045 mysd
->rps_ipi_list
= sd
;
3047 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3050 #endif /* CONFIG_RPS */
3055 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3056 * queue (may be a remote CPU queue).
3058 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3059 unsigned int *qtail
)
3061 struct softnet_data
*sd
;
3062 unsigned long flags
;
3064 sd
= &per_cpu(softnet_data
, cpu
);
3066 local_irq_save(flags
);
3069 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
3070 if (skb_queue_len(&sd
->input_pkt_queue
)) {
3072 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3073 input_queue_tail_incr_save(sd
, qtail
);
3075 local_irq_restore(flags
);
3076 return NET_RX_SUCCESS
;
3079 /* Schedule NAPI for backlog device
3080 * We can use non atomic operation since we own the queue lock
3082 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3083 if (!rps_ipi_queued(sd
))
3084 ____napi_schedule(sd
, &sd
->backlog
);
3092 local_irq_restore(flags
);
3094 atomic_long_inc(&skb
->dev
->rx_dropped
);
3100 * netif_rx - post buffer to the network code
3101 * @skb: buffer to post
3103 * This function receives a packet from a device driver and queues it for
3104 * the upper (protocol) levels to process. It always succeeds. The buffer
3105 * may be dropped during processing for congestion control or by the
3109 * NET_RX_SUCCESS (no congestion)
3110 * NET_RX_DROP (packet was dropped)
3114 int netif_rx(struct sk_buff
*skb
)
3118 /* if netpoll wants it, pretend we never saw it */
3119 if (netpoll_rx(skb
))
3122 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3124 trace_netif_rx(skb
);
3126 if (static_key_false(&rps_needed
)) {
3127 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3133 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3135 cpu
= smp_processor_id();
3137 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3145 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3150 EXPORT_SYMBOL(netif_rx
);
3152 int netif_rx_ni(struct sk_buff
*skb
)
3157 err
= netif_rx(skb
);
3158 if (local_softirq_pending())
3164 EXPORT_SYMBOL(netif_rx_ni
);
3166 static void net_tx_action(struct softirq_action
*h
)
3168 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3170 if (sd
->completion_queue
) {
3171 struct sk_buff
*clist
;
3173 local_irq_disable();
3174 clist
= sd
->completion_queue
;
3175 sd
->completion_queue
= NULL
;
3179 struct sk_buff
*skb
= clist
;
3180 clist
= clist
->next
;
3182 WARN_ON(atomic_read(&skb
->users
));
3183 trace_kfree_skb(skb
, net_tx_action
);
3188 if (sd
->output_queue
) {
3191 local_irq_disable();
3192 head
= sd
->output_queue
;
3193 sd
->output_queue
= NULL
;
3194 sd
->output_queue_tailp
= &sd
->output_queue
;
3198 struct Qdisc
*q
= head
;
3199 spinlock_t
*root_lock
;
3201 head
= head
->next_sched
;
3203 root_lock
= qdisc_lock(q
);
3204 if (spin_trylock(root_lock
)) {
3205 smp_mb__before_clear_bit();
3206 clear_bit(__QDISC_STATE_SCHED
,
3209 spin_unlock(root_lock
);
3211 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3213 __netif_reschedule(q
);
3215 smp_mb__before_clear_bit();
3216 clear_bit(__QDISC_STATE_SCHED
,
3224 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3225 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3226 /* This hook is defined here for ATM LANE */
3227 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3228 unsigned char *addr
) __read_mostly
;
3229 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3232 #ifdef CONFIG_NET_CLS_ACT
3233 /* TODO: Maybe we should just force sch_ingress to be compiled in
3234 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3235 * a compare and 2 stores extra right now if we dont have it on
3236 * but have CONFIG_NET_CLS_ACT
3237 * NOTE: This doesn't stop any functionality; if you dont have
3238 * the ingress scheduler, you just can't add policies on ingress.
3241 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3243 struct net_device
*dev
= skb
->dev
;
3244 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3245 int result
= TC_ACT_OK
;
3248 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3249 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3250 skb
->skb_iif
, dev
->ifindex
);
3254 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3255 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3258 if (q
!= &noop_qdisc
) {
3259 spin_lock(qdisc_lock(q
));
3260 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3261 result
= qdisc_enqueue_root(skb
, q
);
3262 spin_unlock(qdisc_lock(q
));
3268 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3269 struct packet_type
**pt_prev
,
3270 int *ret
, struct net_device
*orig_dev
)
3272 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3274 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3278 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3282 switch (ing_filter(skb
, rxq
)) {
3296 * netdev_rx_handler_register - register receive handler
3297 * @dev: device to register a handler for
3298 * @rx_handler: receive handler to register
3299 * @rx_handler_data: data pointer that is used by rx handler
3301 * Register a receive hander for a device. This handler will then be
3302 * called from __netif_receive_skb. A negative errno code is returned
3305 * The caller must hold the rtnl_mutex.
3307 * For a general description of rx_handler, see enum rx_handler_result.
3309 int netdev_rx_handler_register(struct net_device
*dev
,
3310 rx_handler_func_t
*rx_handler
,
3311 void *rx_handler_data
)
3315 if (dev
->rx_handler
)
3318 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3319 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3323 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3326 * netdev_rx_handler_unregister - unregister receive handler
3327 * @dev: device to unregister a handler from
3329 * Unregister a receive hander from a device.
3331 * The caller must hold the rtnl_mutex.
3333 void netdev_rx_handler_unregister(struct net_device
*dev
)
3337 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3338 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3340 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3343 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3344 * the special handling of PFMEMALLOC skbs.
3346 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3348 switch (skb
->protocol
) {
3349 case __constant_htons(ETH_P_ARP
):
3350 case __constant_htons(ETH_P_IP
):
3351 case __constant_htons(ETH_P_IPV6
):
3352 case __constant_htons(ETH_P_8021Q
):
3359 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3361 struct packet_type
*ptype
, *pt_prev
;
3362 rx_handler_func_t
*rx_handler
;
3363 struct net_device
*orig_dev
;
3364 struct net_device
*null_or_dev
;
3365 bool deliver_exact
= false;
3366 int ret
= NET_RX_DROP
;
3369 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3371 trace_netif_receive_skb(skb
);
3373 /* if we've gotten here through NAPI, check netpoll */
3374 if (netpoll_receive_skb(skb
))
3377 orig_dev
= skb
->dev
;
3379 skb_reset_network_header(skb
);
3380 if (!skb_transport_header_was_set(skb
))
3381 skb_reset_transport_header(skb
);
3382 skb_reset_mac_len(skb
);
3389 skb
->skb_iif
= skb
->dev
->ifindex
;
3391 __this_cpu_inc(softnet_data
.processed
);
3393 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
)) {
3394 skb
= vlan_untag(skb
);
3399 #ifdef CONFIG_NET_CLS_ACT
3400 if (skb
->tc_verd
& TC_NCLS
) {
3401 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3409 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3410 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3412 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3418 #ifdef CONFIG_NET_CLS_ACT
3419 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3425 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3428 if (vlan_tx_tag_present(skb
)) {
3430 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3433 if (vlan_do_receive(&skb
))
3435 else if (unlikely(!skb
))
3439 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3442 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3445 switch (rx_handler(&skb
)) {
3446 case RX_HANDLER_CONSUMED
:
3448 case RX_HANDLER_ANOTHER
:
3450 case RX_HANDLER_EXACT
:
3451 deliver_exact
= true;
3452 case RX_HANDLER_PASS
:
3459 if (vlan_tx_nonzero_tag_present(skb
))
3460 skb
->pkt_type
= PACKET_OTHERHOST
;
3462 /* deliver only exact match when indicated */
3463 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3465 type
= skb
->protocol
;
3466 list_for_each_entry_rcu(ptype
,
3467 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3468 if (ptype
->type
== type
&&
3469 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3470 ptype
->dev
== orig_dev
)) {
3472 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3478 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3481 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3484 atomic_long_inc(&skb
->dev
->rx_dropped
);
3486 /* Jamal, now you will not able to escape explaining
3487 * me how you were going to use this. :-)
3498 static int __netif_receive_skb(struct sk_buff
*skb
)
3502 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3503 unsigned long pflags
= current
->flags
;
3506 * PFMEMALLOC skbs are special, they should
3507 * - be delivered to SOCK_MEMALLOC sockets only
3508 * - stay away from userspace
3509 * - have bounded memory usage
3511 * Use PF_MEMALLOC as this saves us from propagating the allocation
3512 * context down to all allocation sites.
3514 current
->flags
|= PF_MEMALLOC
;
3515 ret
= __netif_receive_skb_core(skb
, true);
3516 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3518 ret
= __netif_receive_skb_core(skb
, false);
3524 * netif_receive_skb - process receive buffer from network
3525 * @skb: buffer to process
3527 * netif_receive_skb() is the main receive data processing function.
3528 * It always succeeds. The buffer may be dropped during processing
3529 * for congestion control or by the protocol layers.
3531 * This function may only be called from softirq context and interrupts
3532 * should be enabled.
3534 * Return values (usually ignored):
3535 * NET_RX_SUCCESS: no congestion
3536 * NET_RX_DROP: packet was dropped
3538 int netif_receive_skb(struct sk_buff
*skb
)
3540 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3542 if (skb_defer_rx_timestamp(skb
))
3543 return NET_RX_SUCCESS
;
3546 if (static_key_false(&rps_needed
)) {
3547 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3552 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3555 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3562 return __netif_receive_skb(skb
);
3564 EXPORT_SYMBOL(netif_receive_skb
);
3566 /* Network device is going away, flush any packets still pending
3567 * Called with irqs disabled.
3569 static void flush_backlog(void *arg
)
3571 struct net_device
*dev
= arg
;
3572 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3573 struct sk_buff
*skb
, *tmp
;
3576 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3577 if (skb
->dev
== dev
) {
3578 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3580 input_queue_head_incr(sd
);
3585 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3586 if (skb
->dev
== dev
) {
3587 __skb_unlink(skb
, &sd
->process_queue
);
3589 input_queue_head_incr(sd
);
3594 static int napi_gro_complete(struct sk_buff
*skb
)
3596 struct packet_offload
*ptype
;
3597 __be16 type
= skb
->protocol
;
3598 struct list_head
*head
= &offload_base
;
3601 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
3603 if (NAPI_GRO_CB(skb
)->count
== 1) {
3604 skb_shinfo(skb
)->gso_size
= 0;
3609 list_for_each_entry_rcu(ptype
, head
, list
) {
3610 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3613 err
= ptype
->callbacks
.gro_complete(skb
);
3619 WARN_ON(&ptype
->list
== head
);
3621 return NET_RX_SUCCESS
;
3625 return netif_receive_skb(skb
);
3628 /* napi->gro_list contains packets ordered by age.
3629 * youngest packets at the head of it.
3630 * Complete skbs in reverse order to reduce latencies.
3632 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3634 struct sk_buff
*skb
, *prev
= NULL
;
3636 /* scan list and build reverse chain */
3637 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3642 for (skb
= prev
; skb
; skb
= prev
) {
3645 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3649 napi_gro_complete(skb
);
3653 napi
->gro_list
= NULL
;
3655 EXPORT_SYMBOL(napi_gro_flush
);
3657 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
3660 unsigned int maclen
= skb
->dev
->hard_header_len
;
3662 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3663 unsigned long diffs
;
3665 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3666 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3667 if (maclen
== ETH_HLEN
)
3668 diffs
|= compare_ether_header(skb_mac_header(p
),
3669 skb_gro_mac_header(skb
));
3671 diffs
= memcmp(skb_mac_header(p
),
3672 skb_gro_mac_header(skb
),
3674 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3675 NAPI_GRO_CB(p
)->flush
= 0;
3679 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3681 struct sk_buff
**pp
= NULL
;
3682 struct packet_offload
*ptype
;
3683 __be16 type
= skb
->protocol
;
3684 struct list_head
*head
= &offload_base
;
3686 enum gro_result ret
;
3688 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3691 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3694 gro_list_prepare(napi
, skb
);
3697 list_for_each_entry_rcu(ptype
, head
, list
) {
3698 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3701 skb_set_network_header(skb
, skb_gro_offset(skb
));
3702 skb_reset_mac_len(skb
);
3703 NAPI_GRO_CB(skb
)->same_flow
= 0;
3704 NAPI_GRO_CB(skb
)->flush
= 0;
3705 NAPI_GRO_CB(skb
)->free
= 0;
3707 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
3712 if (&ptype
->list
== head
)
3715 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3716 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3719 struct sk_buff
*nskb
= *pp
;
3723 napi_gro_complete(nskb
);
3730 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3734 NAPI_GRO_CB(skb
)->count
= 1;
3735 NAPI_GRO_CB(skb
)->age
= jiffies
;
3736 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3737 skb
->next
= napi
->gro_list
;
3738 napi
->gro_list
= skb
;
3742 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3743 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3745 BUG_ON(skb
->end
- skb
->tail
< grow
);
3747 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3750 skb
->data_len
-= grow
;
3752 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3753 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3755 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3756 skb_frag_unref(skb
, 0);
3757 memmove(skb_shinfo(skb
)->frags
,
3758 skb_shinfo(skb
)->frags
+ 1,
3759 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3772 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3776 if (netif_receive_skb(skb
))
3784 case GRO_MERGED_FREE
:
3785 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3786 kmem_cache_free(skbuff_head_cache
, skb
);
3799 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3801 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3802 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3804 NAPI_GRO_CB(skb
)->data_offset
= 0;
3805 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3806 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3808 if (skb
->mac_header
== skb
->tail
&&
3810 !PageHighMem(skb_frag_page(frag0
))) {
3811 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3812 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3816 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3818 skb_gro_reset_offset(skb
);
3820 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
3822 EXPORT_SYMBOL(napi_gro_receive
);
3824 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3826 __skb_pull(skb
, skb_headlen(skb
));
3827 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3828 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3830 skb
->dev
= napi
->dev
;
3836 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3838 struct sk_buff
*skb
= napi
->skb
;
3841 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3847 EXPORT_SYMBOL(napi_get_frags
);
3849 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3855 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3857 if (ret
== GRO_HELD
)
3858 skb_gro_pull(skb
, -ETH_HLEN
);
3859 else if (netif_receive_skb(skb
))
3864 case GRO_MERGED_FREE
:
3865 napi_reuse_skb(napi
, skb
);
3875 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3877 struct sk_buff
*skb
= napi
->skb
;
3884 skb_reset_mac_header(skb
);
3885 skb_gro_reset_offset(skb
);
3887 off
= skb_gro_offset(skb
);
3888 hlen
= off
+ sizeof(*eth
);
3889 eth
= skb_gro_header_fast(skb
, off
);
3890 if (skb_gro_header_hard(skb
, hlen
)) {
3891 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3892 if (unlikely(!eth
)) {
3893 napi_reuse_skb(napi
, skb
);
3899 skb_gro_pull(skb
, sizeof(*eth
));
3902 * This works because the only protocols we care about don't require
3903 * special handling. We'll fix it up properly at the end.
3905 skb
->protocol
= eth
->h_proto
;
3911 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
3913 struct sk_buff
*skb
= napi_frags_skb(napi
);
3918 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
3920 EXPORT_SYMBOL(napi_gro_frags
);
3923 * net_rps_action sends any pending IPI's for rps.
3924 * Note: called with local irq disabled, but exits with local irq enabled.
3926 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
3929 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
3932 sd
->rps_ipi_list
= NULL
;
3936 /* Send pending IPI's to kick RPS processing on remote cpus. */
3938 struct softnet_data
*next
= remsd
->rps_ipi_next
;
3940 if (cpu_online(remsd
->cpu
))
3941 __smp_call_function_single(remsd
->cpu
,
3950 static int process_backlog(struct napi_struct
*napi
, int quota
)
3953 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
3956 /* Check if we have pending ipi, its better to send them now,
3957 * not waiting net_rx_action() end.
3959 if (sd
->rps_ipi_list
) {
3960 local_irq_disable();
3961 net_rps_action_and_irq_enable(sd
);
3964 napi
->weight
= weight_p
;
3965 local_irq_disable();
3966 while (work
< quota
) {
3967 struct sk_buff
*skb
;
3970 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
3972 __netif_receive_skb(skb
);
3973 local_irq_disable();
3974 input_queue_head_incr(sd
);
3975 if (++work
>= quota
) {
3982 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3984 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
3985 &sd
->process_queue
);
3987 if (qlen
< quota
- work
) {
3989 * Inline a custom version of __napi_complete().
3990 * only current cpu owns and manipulates this napi,
3991 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3992 * we can use a plain write instead of clear_bit(),
3993 * and we dont need an smp_mb() memory barrier.
3995 list_del(&napi
->poll_list
);
3998 quota
= work
+ qlen
;
4008 * __napi_schedule - schedule for receive
4009 * @n: entry to schedule
4011 * The entry's receive function will be scheduled to run
4013 void __napi_schedule(struct napi_struct
*n
)
4015 unsigned long flags
;
4017 local_irq_save(flags
);
4018 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
4019 local_irq_restore(flags
);
4021 EXPORT_SYMBOL(__napi_schedule
);
4023 void __napi_complete(struct napi_struct
*n
)
4025 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4026 BUG_ON(n
->gro_list
);
4028 list_del(&n
->poll_list
);
4029 smp_mb__before_clear_bit();
4030 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4032 EXPORT_SYMBOL(__napi_complete
);
4034 void napi_complete(struct napi_struct
*n
)
4036 unsigned long flags
;
4039 * don't let napi dequeue from the cpu poll list
4040 * just in case its running on a different cpu
4042 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4045 napi_gro_flush(n
, false);
4046 local_irq_save(flags
);
4048 local_irq_restore(flags
);
4050 EXPORT_SYMBOL(napi_complete
);
4052 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4053 int (*poll
)(struct napi_struct
*, int), int weight
)
4055 INIT_LIST_HEAD(&napi
->poll_list
);
4056 napi
->gro_count
= 0;
4057 napi
->gro_list
= NULL
;
4060 napi
->weight
= weight
;
4061 list_add(&napi
->dev_list
, &dev
->napi_list
);
4063 #ifdef CONFIG_NETPOLL
4064 spin_lock_init(&napi
->poll_lock
);
4065 napi
->poll_owner
= -1;
4067 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4069 EXPORT_SYMBOL(netif_napi_add
);
4071 void netif_napi_del(struct napi_struct
*napi
)
4073 struct sk_buff
*skb
, *next
;
4075 list_del_init(&napi
->dev_list
);
4076 napi_free_frags(napi
);
4078 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
4084 napi
->gro_list
= NULL
;
4085 napi
->gro_count
= 0;
4087 EXPORT_SYMBOL(netif_napi_del
);
4089 static void net_rx_action(struct softirq_action
*h
)
4091 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
4092 unsigned long time_limit
= jiffies
+ 2;
4093 int budget
= netdev_budget
;
4096 local_irq_disable();
4098 while (!list_empty(&sd
->poll_list
)) {
4099 struct napi_struct
*n
;
4102 /* If softirq window is exhuasted then punt.
4103 * Allow this to run for 2 jiffies since which will allow
4104 * an average latency of 1.5/HZ.
4106 if (unlikely(budget
<= 0 || time_after(jiffies
, time_limit
)))
4111 /* Even though interrupts have been re-enabled, this
4112 * access is safe because interrupts can only add new
4113 * entries to the tail of this list, and only ->poll()
4114 * calls can remove this head entry from the list.
4116 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
4118 have
= netpoll_poll_lock(n
);
4122 /* This NAPI_STATE_SCHED test is for avoiding a race
4123 * with netpoll's poll_napi(). Only the entity which
4124 * obtains the lock and sees NAPI_STATE_SCHED set will
4125 * actually make the ->poll() call. Therefore we avoid
4126 * accidentally calling ->poll() when NAPI is not scheduled.
4129 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4130 work
= n
->poll(n
, weight
);
4134 WARN_ON_ONCE(work
> weight
);
4138 local_irq_disable();
4140 /* Drivers must not modify the NAPI state if they
4141 * consume the entire weight. In such cases this code
4142 * still "owns" the NAPI instance and therefore can
4143 * move the instance around on the list at-will.
4145 if (unlikely(work
== weight
)) {
4146 if (unlikely(napi_disable_pending(n
))) {
4149 local_irq_disable();
4152 /* flush too old packets
4153 * If HZ < 1000, flush all packets.
4156 napi_gro_flush(n
, HZ
>= 1000);
4157 local_irq_disable();
4159 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4163 netpoll_poll_unlock(have
);
4166 net_rps_action_and_irq_enable(sd
);
4168 #ifdef CONFIG_NET_DMA
4170 * There may not be any more sk_buffs coming right now, so push
4171 * any pending DMA copies to hardware
4173 dma_issue_pending_all();
4180 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4184 struct netdev_upper
{
4185 struct net_device
*dev
;
4187 struct list_head list
;
4188 struct rcu_head rcu
;
4189 struct list_head search_list
;
4192 static void __append_search_uppers(struct list_head
*search_list
,
4193 struct net_device
*dev
)
4195 struct netdev_upper
*upper
;
4197 list_for_each_entry(upper
, &dev
->upper_dev_list
, list
) {
4198 /* check if this upper is not already in search list */
4199 if (list_empty(&upper
->search_list
))
4200 list_add_tail(&upper
->search_list
, search_list
);
4204 static bool __netdev_search_upper_dev(struct net_device
*dev
,
4205 struct net_device
*upper_dev
)
4207 LIST_HEAD(search_list
);
4208 struct netdev_upper
*upper
;
4209 struct netdev_upper
*tmp
;
4212 __append_search_uppers(&search_list
, dev
);
4213 list_for_each_entry(upper
, &search_list
, search_list
) {
4214 if (upper
->dev
== upper_dev
) {
4218 __append_search_uppers(&search_list
, upper
->dev
);
4220 list_for_each_entry_safe(upper
, tmp
, &search_list
, search_list
)
4221 INIT_LIST_HEAD(&upper
->search_list
);
4225 static struct netdev_upper
*__netdev_find_upper(struct net_device
*dev
,
4226 struct net_device
*upper_dev
)
4228 struct netdev_upper
*upper
;
4230 list_for_each_entry(upper
, &dev
->upper_dev_list
, list
) {
4231 if (upper
->dev
== upper_dev
)
4238 * netdev_has_upper_dev - Check if device is linked to an upper device
4240 * @upper_dev: upper device to check
4242 * Find out if a device is linked to specified upper device and return true
4243 * in case it is. Note that this checks only immediate upper device,
4244 * not through a complete stack of devices. The caller must hold the RTNL lock.
4246 bool netdev_has_upper_dev(struct net_device
*dev
,
4247 struct net_device
*upper_dev
)
4251 return __netdev_find_upper(dev
, upper_dev
);
4253 EXPORT_SYMBOL(netdev_has_upper_dev
);
4256 * netdev_has_any_upper_dev - Check if device is linked to some device
4259 * Find out if a device is linked to an upper device and return true in case
4260 * it is. The caller must hold the RTNL lock.
4262 bool netdev_has_any_upper_dev(struct net_device
*dev
)
4266 return !list_empty(&dev
->upper_dev_list
);
4268 EXPORT_SYMBOL(netdev_has_any_upper_dev
);
4271 * netdev_master_upper_dev_get - Get master upper device
4274 * Find a master upper device and return pointer to it or NULL in case
4275 * it's not there. The caller must hold the RTNL lock.
4277 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4279 struct netdev_upper
*upper
;
4283 if (list_empty(&dev
->upper_dev_list
))
4286 upper
= list_first_entry(&dev
->upper_dev_list
,
4287 struct netdev_upper
, list
);
4288 if (likely(upper
->master
))
4292 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4295 * netdev_master_upper_dev_get_rcu - Get master upper device
4298 * Find a master upper device and return pointer to it or NULL in case
4299 * it's not there. The caller must hold the RCU read lock.
4301 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4303 struct netdev_upper
*upper
;
4305 upper
= list_first_or_null_rcu(&dev
->upper_dev_list
,
4306 struct netdev_upper
, list
);
4307 if (upper
&& likely(upper
->master
))
4311 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4313 static int __netdev_upper_dev_link(struct net_device
*dev
,
4314 struct net_device
*upper_dev
, bool master
)
4316 struct netdev_upper
*upper
;
4320 if (dev
== upper_dev
)
4323 /* To prevent loops, check if dev is not upper device to upper_dev. */
4324 if (__netdev_search_upper_dev(upper_dev
, dev
))
4327 if (__netdev_find_upper(dev
, upper_dev
))
4330 if (master
&& netdev_master_upper_dev_get(dev
))
4333 upper
= kmalloc(sizeof(*upper
), GFP_KERNEL
);
4337 upper
->dev
= upper_dev
;
4338 upper
->master
= master
;
4339 INIT_LIST_HEAD(&upper
->search_list
);
4341 /* Ensure that master upper link is always the first item in list. */
4343 list_add_rcu(&upper
->list
, &dev
->upper_dev_list
);
4345 list_add_tail_rcu(&upper
->list
, &dev
->upper_dev_list
);
4346 dev_hold(upper_dev
);
4352 * netdev_upper_dev_link - Add a link to the upper device
4354 * @upper_dev: new upper device
4356 * Adds a link to device which is upper to this one. The caller must hold
4357 * the RTNL lock. On a failure a negative errno code is returned.
4358 * On success the reference counts are adjusted and the function
4361 int netdev_upper_dev_link(struct net_device
*dev
,
4362 struct net_device
*upper_dev
)
4364 return __netdev_upper_dev_link(dev
, upper_dev
, false);
4366 EXPORT_SYMBOL(netdev_upper_dev_link
);
4369 * netdev_master_upper_dev_link - Add a master link to the upper device
4371 * @upper_dev: new upper device
4373 * Adds a link to device which is upper to this one. In this case, only
4374 * one master upper device can be linked, although other non-master devices
4375 * might be linked as well. The caller must hold the RTNL lock.
4376 * On a failure a negative errno code is returned. On success the reference
4377 * counts are adjusted and the function returns zero.
4379 int netdev_master_upper_dev_link(struct net_device
*dev
,
4380 struct net_device
*upper_dev
)
4382 return __netdev_upper_dev_link(dev
, upper_dev
, true);
4384 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
4387 * netdev_upper_dev_unlink - Removes a link to upper device
4389 * @upper_dev: new upper device
4391 * Removes a link to device which is upper to this one. The caller must hold
4394 void netdev_upper_dev_unlink(struct net_device
*dev
,
4395 struct net_device
*upper_dev
)
4397 struct netdev_upper
*upper
;
4401 upper
= __netdev_find_upper(dev
, upper_dev
);
4404 list_del_rcu(&upper
->list
);
4406 kfree_rcu(upper
, rcu
);
4408 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
4410 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4412 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4414 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
4415 ops
->ndo_change_rx_flags(dev
, flags
);
4418 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4420 unsigned int old_flags
= dev
->flags
;
4426 dev
->flags
|= IFF_PROMISC
;
4427 dev
->promiscuity
+= inc
;
4428 if (dev
->promiscuity
== 0) {
4431 * If inc causes overflow, untouch promisc and return error.
4434 dev
->flags
&= ~IFF_PROMISC
;
4436 dev
->promiscuity
-= inc
;
4437 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4442 if (dev
->flags
!= old_flags
) {
4443 pr_info("device %s %s promiscuous mode\n",
4445 dev
->flags
& IFF_PROMISC
? "entered" : "left");
4446 if (audit_enabled
) {
4447 current_uid_gid(&uid
, &gid
);
4448 audit_log(current
->audit_context
, GFP_ATOMIC
,
4449 AUDIT_ANOM_PROMISCUOUS
,
4450 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4451 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4452 (old_flags
& IFF_PROMISC
),
4453 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
4454 from_kuid(&init_user_ns
, uid
),
4455 from_kgid(&init_user_ns
, gid
),
4456 audit_get_sessionid(current
));
4459 dev_change_rx_flags(dev
, IFF_PROMISC
);
4465 * dev_set_promiscuity - update promiscuity count on a device
4469 * Add or remove promiscuity from a device. While the count in the device
4470 * remains above zero the interface remains promiscuous. Once it hits zero
4471 * the device reverts back to normal filtering operation. A negative inc
4472 * value is used to drop promiscuity on the device.
4473 * Return 0 if successful or a negative errno code on error.
4475 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4477 unsigned int old_flags
= dev
->flags
;
4480 err
= __dev_set_promiscuity(dev
, inc
);
4483 if (dev
->flags
!= old_flags
)
4484 dev_set_rx_mode(dev
);
4487 EXPORT_SYMBOL(dev_set_promiscuity
);
4490 * dev_set_allmulti - update allmulti count on a device
4494 * Add or remove reception of all multicast frames to a device. While the
4495 * count in the device remains above zero the interface remains listening
4496 * to all interfaces. Once it hits zero the device reverts back to normal
4497 * filtering operation. A negative @inc value is used to drop the counter
4498 * when releasing a resource needing all multicasts.
4499 * Return 0 if successful or a negative errno code on error.
4502 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4504 unsigned int old_flags
= dev
->flags
;
4508 dev
->flags
|= IFF_ALLMULTI
;
4509 dev
->allmulti
+= inc
;
4510 if (dev
->allmulti
== 0) {
4513 * If inc causes overflow, untouch allmulti and return error.
4516 dev
->flags
&= ~IFF_ALLMULTI
;
4518 dev
->allmulti
-= inc
;
4519 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4524 if (dev
->flags
^ old_flags
) {
4525 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4526 dev_set_rx_mode(dev
);
4530 EXPORT_SYMBOL(dev_set_allmulti
);
4533 * Upload unicast and multicast address lists to device and
4534 * configure RX filtering. When the device doesn't support unicast
4535 * filtering it is put in promiscuous mode while unicast addresses
4538 void __dev_set_rx_mode(struct net_device
*dev
)
4540 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4542 /* dev_open will call this function so the list will stay sane. */
4543 if (!(dev
->flags
&IFF_UP
))
4546 if (!netif_device_present(dev
))
4549 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
4550 /* Unicast addresses changes may only happen under the rtnl,
4551 * therefore calling __dev_set_promiscuity here is safe.
4553 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4554 __dev_set_promiscuity(dev
, 1);
4555 dev
->uc_promisc
= true;
4556 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4557 __dev_set_promiscuity(dev
, -1);
4558 dev
->uc_promisc
= false;
4562 if (ops
->ndo_set_rx_mode
)
4563 ops
->ndo_set_rx_mode(dev
);
4566 void dev_set_rx_mode(struct net_device
*dev
)
4568 netif_addr_lock_bh(dev
);
4569 __dev_set_rx_mode(dev
);
4570 netif_addr_unlock_bh(dev
);
4574 * dev_get_flags - get flags reported to userspace
4577 * Get the combination of flag bits exported through APIs to userspace.
4579 unsigned int dev_get_flags(const struct net_device
*dev
)
4583 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4588 (dev
->gflags
& (IFF_PROMISC
|
4591 if (netif_running(dev
)) {
4592 if (netif_oper_up(dev
))
4593 flags
|= IFF_RUNNING
;
4594 if (netif_carrier_ok(dev
))
4595 flags
|= IFF_LOWER_UP
;
4596 if (netif_dormant(dev
))
4597 flags
|= IFF_DORMANT
;
4602 EXPORT_SYMBOL(dev_get_flags
);
4604 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4606 unsigned int old_flags
= dev
->flags
;
4612 * Set the flags on our device.
4615 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4616 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4618 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4622 * Load in the correct multicast list now the flags have changed.
4625 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4626 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4628 dev_set_rx_mode(dev
);
4631 * Have we downed the interface. We handle IFF_UP ourselves
4632 * according to user attempts to set it, rather than blindly
4637 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4638 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4641 dev_set_rx_mode(dev
);
4644 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4645 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4647 dev
->gflags
^= IFF_PROMISC
;
4648 dev_set_promiscuity(dev
, inc
);
4651 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4652 is important. Some (broken) drivers set IFF_PROMISC, when
4653 IFF_ALLMULTI is requested not asking us and not reporting.
4655 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4656 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4658 dev
->gflags
^= IFF_ALLMULTI
;
4659 dev_set_allmulti(dev
, inc
);
4665 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4667 unsigned int changes
= dev
->flags
^ old_flags
;
4669 if (changes
& IFF_UP
) {
4670 if (dev
->flags
& IFF_UP
)
4671 call_netdevice_notifiers(NETDEV_UP
, dev
);
4673 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4676 if (dev
->flags
& IFF_UP
&&
4677 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4678 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4682 * dev_change_flags - change device settings
4684 * @flags: device state flags
4686 * Change settings on device based state flags. The flags are
4687 * in the userspace exported format.
4689 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4692 unsigned int changes
, old_flags
= dev
->flags
;
4694 ret
= __dev_change_flags(dev
, flags
);
4698 changes
= old_flags
^ dev
->flags
;
4700 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4702 __dev_notify_flags(dev
, old_flags
);
4705 EXPORT_SYMBOL(dev_change_flags
);
4708 * dev_set_mtu - Change maximum transfer unit
4710 * @new_mtu: new transfer unit
4712 * Change the maximum transfer size of the network device.
4714 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4716 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4719 if (new_mtu
== dev
->mtu
)
4722 /* MTU must be positive. */
4726 if (!netif_device_present(dev
))
4730 if (ops
->ndo_change_mtu
)
4731 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4736 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4739 EXPORT_SYMBOL(dev_set_mtu
);
4742 * dev_set_group - Change group this device belongs to
4744 * @new_group: group this device should belong to
4746 void dev_set_group(struct net_device
*dev
, int new_group
)
4748 dev
->group
= new_group
;
4750 EXPORT_SYMBOL(dev_set_group
);
4753 * dev_set_mac_address - Change Media Access Control Address
4757 * Change the hardware (MAC) address of the device
4759 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4761 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4764 if (!ops
->ndo_set_mac_address
)
4766 if (sa
->sa_family
!= dev
->type
)
4768 if (!netif_device_present(dev
))
4770 err
= ops
->ndo_set_mac_address(dev
, sa
);
4773 dev
->addr_assign_type
= NET_ADDR_SET
;
4774 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4775 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
4778 EXPORT_SYMBOL(dev_set_mac_address
);
4781 * dev_change_carrier - Change device carrier
4783 * @new_carries: new value
4785 * Change device carrier
4787 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
4789 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4791 if (!ops
->ndo_change_carrier
)
4793 if (!netif_device_present(dev
))
4795 return ops
->ndo_change_carrier(dev
, new_carrier
);
4797 EXPORT_SYMBOL(dev_change_carrier
);
4800 * dev_new_index - allocate an ifindex
4801 * @net: the applicable net namespace
4803 * Returns a suitable unique value for a new device interface
4804 * number. The caller must hold the rtnl semaphore or the
4805 * dev_base_lock to be sure it remains unique.
4807 static int dev_new_index(struct net
*net
)
4809 int ifindex
= net
->ifindex
;
4813 if (!__dev_get_by_index(net
, ifindex
))
4814 return net
->ifindex
= ifindex
;
4818 /* Delayed registration/unregisteration */
4819 static LIST_HEAD(net_todo_list
);
4821 static void net_set_todo(struct net_device
*dev
)
4823 list_add_tail(&dev
->todo_list
, &net_todo_list
);
4826 static void rollback_registered_many(struct list_head
*head
)
4828 struct net_device
*dev
, *tmp
;
4830 BUG_ON(dev_boot_phase
);
4833 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
4834 /* Some devices call without registering
4835 * for initialization unwind. Remove those
4836 * devices and proceed with the remaining.
4838 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
4839 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
4843 list_del(&dev
->unreg_list
);
4846 dev
->dismantle
= true;
4847 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
4850 /* If device is running, close it first. */
4851 dev_close_many(head
);
4853 list_for_each_entry(dev
, head
, unreg_list
) {
4854 /* And unlink it from device chain. */
4855 unlist_netdevice(dev
);
4857 dev
->reg_state
= NETREG_UNREGISTERING
;
4862 list_for_each_entry(dev
, head
, unreg_list
) {
4863 /* Shutdown queueing discipline. */
4867 /* Notify protocols, that we are about to destroy
4868 this device. They should clean all the things.
4870 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
4872 if (!dev
->rtnl_link_ops
||
4873 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
4874 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
4877 * Flush the unicast and multicast chains
4882 if (dev
->netdev_ops
->ndo_uninit
)
4883 dev
->netdev_ops
->ndo_uninit(dev
);
4885 /* Notifier chain MUST detach us all upper devices. */
4886 WARN_ON(netdev_has_any_upper_dev(dev
));
4888 /* Remove entries from kobject tree */
4889 netdev_unregister_kobject(dev
);
4891 /* Remove XPS queueing entries */
4892 netif_reset_xps_queues_gt(dev
, 0);
4898 list_for_each_entry(dev
, head
, unreg_list
)
4902 static void rollback_registered(struct net_device
*dev
)
4906 list_add(&dev
->unreg_list
, &single
);
4907 rollback_registered_many(&single
);
4911 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
4912 netdev_features_t features
)
4914 /* Fix illegal checksum combinations */
4915 if ((features
& NETIF_F_HW_CSUM
) &&
4916 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
4917 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
4918 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
4921 /* Fix illegal SG+CSUM combinations. */
4922 if ((features
& NETIF_F_SG
) &&
4923 !(features
& NETIF_F_ALL_CSUM
)) {
4925 "Dropping NETIF_F_SG since no checksum feature.\n");
4926 features
&= ~NETIF_F_SG
;
4929 /* TSO requires that SG is present as well. */
4930 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
4931 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
4932 features
&= ~NETIF_F_ALL_TSO
;
4935 /* TSO ECN requires that TSO is present as well. */
4936 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
4937 features
&= ~NETIF_F_TSO_ECN
;
4939 /* Software GSO depends on SG. */
4940 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
4941 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
4942 features
&= ~NETIF_F_GSO
;
4945 /* UFO needs SG and checksumming */
4946 if (features
& NETIF_F_UFO
) {
4947 /* maybe split UFO into V4 and V6? */
4948 if (!((features
& NETIF_F_GEN_CSUM
) ||
4949 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
4950 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
4952 "Dropping NETIF_F_UFO since no checksum offload features.\n");
4953 features
&= ~NETIF_F_UFO
;
4956 if (!(features
& NETIF_F_SG
)) {
4958 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
4959 features
&= ~NETIF_F_UFO
;
4966 int __netdev_update_features(struct net_device
*dev
)
4968 netdev_features_t features
;
4973 features
= netdev_get_wanted_features(dev
);
4975 if (dev
->netdev_ops
->ndo_fix_features
)
4976 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
4978 /* driver might be less strict about feature dependencies */
4979 features
= netdev_fix_features(dev
, features
);
4981 if (dev
->features
== features
)
4984 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
4985 &dev
->features
, &features
);
4987 if (dev
->netdev_ops
->ndo_set_features
)
4988 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
4990 if (unlikely(err
< 0)) {
4992 "set_features() failed (%d); wanted %pNF, left %pNF\n",
4993 err
, &features
, &dev
->features
);
4998 dev
->features
= features
;
5004 * netdev_update_features - recalculate device features
5005 * @dev: the device to check
5007 * Recalculate dev->features set and send notifications if it
5008 * has changed. Should be called after driver or hardware dependent
5009 * conditions might have changed that influence the features.
5011 void netdev_update_features(struct net_device
*dev
)
5013 if (__netdev_update_features(dev
))
5014 netdev_features_change(dev
);
5016 EXPORT_SYMBOL(netdev_update_features
);
5019 * netdev_change_features - recalculate device features
5020 * @dev: the device to check
5022 * Recalculate dev->features set and send notifications even
5023 * if they have not changed. Should be called instead of
5024 * netdev_update_features() if also dev->vlan_features might
5025 * have changed to allow the changes to be propagated to stacked
5028 void netdev_change_features(struct net_device
*dev
)
5030 __netdev_update_features(dev
);
5031 netdev_features_change(dev
);
5033 EXPORT_SYMBOL(netdev_change_features
);
5036 * netif_stacked_transfer_operstate - transfer operstate
5037 * @rootdev: the root or lower level device to transfer state from
5038 * @dev: the device to transfer operstate to
5040 * Transfer operational state from root to device. This is normally
5041 * called when a stacking relationship exists between the root
5042 * device and the device(a leaf device).
5044 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5045 struct net_device
*dev
)
5047 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5048 netif_dormant_on(dev
);
5050 netif_dormant_off(dev
);
5052 if (netif_carrier_ok(rootdev
)) {
5053 if (!netif_carrier_ok(dev
))
5054 netif_carrier_on(dev
);
5056 if (netif_carrier_ok(dev
))
5057 netif_carrier_off(dev
);
5060 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5063 static int netif_alloc_rx_queues(struct net_device
*dev
)
5065 unsigned int i
, count
= dev
->num_rx_queues
;
5066 struct netdev_rx_queue
*rx
;
5070 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5076 for (i
= 0; i
< count
; i
++)
5082 static void netdev_init_one_queue(struct net_device
*dev
,
5083 struct netdev_queue
*queue
, void *_unused
)
5085 /* Initialize queue lock */
5086 spin_lock_init(&queue
->_xmit_lock
);
5087 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5088 queue
->xmit_lock_owner
= -1;
5089 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5092 dql_init(&queue
->dql
, HZ
);
5096 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5098 unsigned int count
= dev
->num_tx_queues
;
5099 struct netdev_queue
*tx
;
5103 tx
= kcalloc(count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5109 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5110 spin_lock_init(&dev
->tx_global_lock
);
5116 * register_netdevice - register a network device
5117 * @dev: device to register
5119 * Take a completed network device structure and add it to the kernel
5120 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5121 * chain. 0 is returned on success. A negative errno code is returned
5122 * on a failure to set up the device, or if the name is a duplicate.
5124 * Callers must hold the rtnl semaphore. You may want
5125 * register_netdev() instead of this.
5128 * The locking appears insufficient to guarantee two parallel registers
5129 * will not get the same name.
5132 int register_netdevice(struct net_device
*dev
)
5135 struct net
*net
= dev_net(dev
);
5137 BUG_ON(dev_boot_phase
);
5142 /* When net_device's are persistent, this will be fatal. */
5143 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5146 spin_lock_init(&dev
->addr_list_lock
);
5147 netdev_set_addr_lockdep_class(dev
);
5151 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
5155 /* Init, if this function is available */
5156 if (dev
->netdev_ops
->ndo_init
) {
5157 ret
= dev
->netdev_ops
->ndo_init(dev
);
5165 if (((dev
->hw_features
| dev
->features
) & NETIF_F_HW_VLAN_FILTER
) &&
5166 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
5167 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
5168 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
5175 dev
->ifindex
= dev_new_index(net
);
5176 else if (__dev_get_by_index(net
, dev
->ifindex
))
5179 if (dev
->iflink
== -1)
5180 dev
->iflink
= dev
->ifindex
;
5182 /* Transfer changeable features to wanted_features and enable
5183 * software offloads (GSO and GRO).
5185 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5186 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5187 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5189 /* Turn on no cache copy if HW is doing checksum */
5190 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5191 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5192 if (dev
->features
& NETIF_F_ALL_CSUM
) {
5193 dev
->wanted_features
|= NETIF_F_NOCACHE_COPY
;
5194 dev
->features
|= NETIF_F_NOCACHE_COPY
;
5198 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5200 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5202 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5203 ret
= notifier_to_errno(ret
);
5207 ret
= netdev_register_kobject(dev
);
5210 dev
->reg_state
= NETREG_REGISTERED
;
5212 __netdev_update_features(dev
);
5215 * Default initial state at registry is that the
5216 * device is present.
5219 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5221 linkwatch_init_dev(dev
);
5223 dev_init_scheduler(dev
);
5225 list_netdevice(dev
);
5226 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5228 /* If the device has permanent device address, driver should
5229 * set dev_addr and also addr_assign_type should be set to
5230 * NET_ADDR_PERM (default value).
5232 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
5233 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
5235 /* Notify protocols, that a new device appeared. */
5236 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5237 ret
= notifier_to_errno(ret
);
5239 rollback_registered(dev
);
5240 dev
->reg_state
= NETREG_UNREGISTERED
;
5243 * Prevent userspace races by waiting until the network
5244 * device is fully setup before sending notifications.
5246 if (!dev
->rtnl_link_ops
||
5247 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5248 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5254 if (dev
->netdev_ops
->ndo_uninit
)
5255 dev
->netdev_ops
->ndo_uninit(dev
);
5258 EXPORT_SYMBOL(register_netdevice
);
5261 * init_dummy_netdev - init a dummy network device for NAPI
5262 * @dev: device to init
5264 * This takes a network device structure and initialize the minimum
5265 * amount of fields so it can be used to schedule NAPI polls without
5266 * registering a full blown interface. This is to be used by drivers
5267 * that need to tie several hardware interfaces to a single NAPI
5268 * poll scheduler due to HW limitations.
5270 int init_dummy_netdev(struct net_device
*dev
)
5272 /* Clear everything. Note we don't initialize spinlocks
5273 * are they aren't supposed to be taken by any of the
5274 * NAPI code and this dummy netdev is supposed to be
5275 * only ever used for NAPI polls
5277 memset(dev
, 0, sizeof(struct net_device
));
5279 /* make sure we BUG if trying to hit standard
5280 * register/unregister code path
5282 dev
->reg_state
= NETREG_DUMMY
;
5284 /* NAPI wants this */
5285 INIT_LIST_HEAD(&dev
->napi_list
);
5287 /* a dummy interface is started by default */
5288 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5289 set_bit(__LINK_STATE_START
, &dev
->state
);
5291 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5292 * because users of this 'device' dont need to change
5298 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5302 * register_netdev - register a network device
5303 * @dev: device to register
5305 * Take a completed network device structure and add it to the kernel
5306 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5307 * chain. 0 is returned on success. A negative errno code is returned
5308 * on a failure to set up the device, or if the name is a duplicate.
5310 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5311 * and expands the device name if you passed a format string to
5314 int register_netdev(struct net_device
*dev
)
5319 err
= register_netdevice(dev
);
5323 EXPORT_SYMBOL(register_netdev
);
5325 int netdev_refcnt_read(const struct net_device
*dev
)
5329 for_each_possible_cpu(i
)
5330 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5333 EXPORT_SYMBOL(netdev_refcnt_read
);
5336 * netdev_wait_allrefs - wait until all references are gone.
5337 * @dev: target net_device
5339 * This is called when unregistering network devices.
5341 * Any protocol or device that holds a reference should register
5342 * for netdevice notification, and cleanup and put back the
5343 * reference if they receive an UNREGISTER event.
5344 * We can get stuck here if buggy protocols don't correctly
5347 static void netdev_wait_allrefs(struct net_device
*dev
)
5349 unsigned long rebroadcast_time
, warning_time
;
5352 linkwatch_forget_dev(dev
);
5354 rebroadcast_time
= warning_time
= jiffies
;
5355 refcnt
= netdev_refcnt_read(dev
);
5357 while (refcnt
!= 0) {
5358 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5361 /* Rebroadcast unregister notification */
5362 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5368 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5369 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5371 /* We must not have linkwatch events
5372 * pending on unregister. If this
5373 * happens, we simply run the queue
5374 * unscheduled, resulting in a noop
5377 linkwatch_run_queue();
5382 rebroadcast_time
= jiffies
;
5387 refcnt
= netdev_refcnt_read(dev
);
5389 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5390 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5392 warning_time
= jiffies
;
5401 * register_netdevice(x1);
5402 * register_netdevice(x2);
5404 * unregister_netdevice(y1);
5405 * unregister_netdevice(y2);
5411 * We are invoked by rtnl_unlock().
5412 * This allows us to deal with problems:
5413 * 1) We can delete sysfs objects which invoke hotplug
5414 * without deadlocking with linkwatch via keventd.
5415 * 2) Since we run with the RTNL semaphore not held, we can sleep
5416 * safely in order to wait for the netdev refcnt to drop to zero.
5418 * We must not return until all unregister events added during
5419 * the interval the lock was held have been completed.
5421 void netdev_run_todo(void)
5423 struct list_head list
;
5425 /* Snapshot list, allow later requests */
5426 list_replace_init(&net_todo_list
, &list
);
5431 /* Wait for rcu callbacks to finish before next phase */
5432 if (!list_empty(&list
))
5435 while (!list_empty(&list
)) {
5436 struct net_device
*dev
5437 = list_first_entry(&list
, struct net_device
, todo_list
);
5438 list_del(&dev
->todo_list
);
5441 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5444 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5445 pr_err("network todo '%s' but state %d\n",
5446 dev
->name
, dev
->reg_state
);
5451 dev
->reg_state
= NETREG_UNREGISTERED
;
5453 on_each_cpu(flush_backlog
, dev
, 1);
5455 netdev_wait_allrefs(dev
);
5458 BUG_ON(netdev_refcnt_read(dev
));
5459 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
5460 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
5461 WARN_ON(dev
->dn_ptr
);
5463 if (dev
->destructor
)
5464 dev
->destructor(dev
);
5466 /* Free network device */
5467 kobject_put(&dev
->dev
.kobj
);
5471 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5472 * fields in the same order, with only the type differing.
5474 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5475 const struct net_device_stats
*netdev_stats
)
5477 #if BITS_PER_LONG == 64
5478 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5479 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5481 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5482 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5483 u64
*dst
= (u64
*)stats64
;
5485 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5486 sizeof(*stats64
) / sizeof(u64
));
5487 for (i
= 0; i
< n
; i
++)
5491 EXPORT_SYMBOL(netdev_stats_to_stats64
);
5494 * dev_get_stats - get network device statistics
5495 * @dev: device to get statistics from
5496 * @storage: place to store stats
5498 * Get network statistics from device. Return @storage.
5499 * The device driver may provide its own method by setting
5500 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5501 * otherwise the internal statistics structure is used.
5503 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5504 struct rtnl_link_stats64
*storage
)
5506 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5508 if (ops
->ndo_get_stats64
) {
5509 memset(storage
, 0, sizeof(*storage
));
5510 ops
->ndo_get_stats64(dev
, storage
);
5511 } else if (ops
->ndo_get_stats
) {
5512 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5514 netdev_stats_to_stats64(storage
, &dev
->stats
);
5516 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
5519 EXPORT_SYMBOL(dev_get_stats
);
5521 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
5523 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
5525 #ifdef CONFIG_NET_CLS_ACT
5528 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
5531 netdev_init_one_queue(dev
, queue
, NULL
);
5532 queue
->qdisc
= &noop_qdisc
;
5533 queue
->qdisc_sleeping
= &noop_qdisc
;
5534 rcu_assign_pointer(dev
->ingress_queue
, queue
);
5539 static const struct ethtool_ops default_ethtool_ops
;
5541 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
5542 const struct ethtool_ops
*ops
)
5544 if (dev
->ethtool_ops
== &default_ethtool_ops
)
5545 dev
->ethtool_ops
= ops
;
5547 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
5550 * alloc_netdev_mqs - allocate network device
5551 * @sizeof_priv: size of private data to allocate space for
5552 * @name: device name format string
5553 * @setup: callback to initialize device
5554 * @txqs: the number of TX subqueues to allocate
5555 * @rxqs: the number of RX subqueues to allocate
5557 * Allocates a struct net_device with private data area for driver use
5558 * and performs basic initialization. Also allocates subquue structs
5559 * for each queue on the device.
5561 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
5562 void (*setup
)(struct net_device
*),
5563 unsigned int txqs
, unsigned int rxqs
)
5565 struct net_device
*dev
;
5567 struct net_device
*p
;
5569 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5572 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5578 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5583 alloc_size
= sizeof(struct net_device
);
5585 /* ensure 32-byte alignment of private area */
5586 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5587 alloc_size
+= sizeof_priv
;
5589 /* ensure 32-byte alignment of whole construct */
5590 alloc_size
+= NETDEV_ALIGN
- 1;
5592 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5596 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5597 dev
->padded
= (char *)dev
- (char *)p
;
5599 dev
->pcpu_refcnt
= alloc_percpu(int);
5600 if (!dev
->pcpu_refcnt
)
5603 if (dev_addr_init(dev
))
5609 dev_net_set(dev
, &init_net
);
5611 dev
->gso_max_size
= GSO_MAX_SIZE
;
5612 dev
->gso_max_segs
= GSO_MAX_SEGS
;
5614 INIT_LIST_HEAD(&dev
->napi_list
);
5615 INIT_LIST_HEAD(&dev
->unreg_list
);
5616 INIT_LIST_HEAD(&dev
->link_watch_list
);
5617 INIT_LIST_HEAD(&dev
->upper_dev_list
);
5618 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
5621 dev
->num_tx_queues
= txqs
;
5622 dev
->real_num_tx_queues
= txqs
;
5623 if (netif_alloc_netdev_queues(dev
))
5627 dev
->num_rx_queues
= rxqs
;
5628 dev
->real_num_rx_queues
= rxqs
;
5629 if (netif_alloc_rx_queues(dev
))
5633 strcpy(dev
->name
, name
);
5634 dev
->group
= INIT_NETDEV_GROUP
;
5635 if (!dev
->ethtool_ops
)
5636 dev
->ethtool_ops
= &default_ethtool_ops
;
5644 free_percpu(dev
->pcpu_refcnt
);
5654 EXPORT_SYMBOL(alloc_netdev_mqs
);
5657 * free_netdev - free network device
5660 * This function does the last stage of destroying an allocated device
5661 * interface. The reference to the device object is released.
5662 * If this is the last reference then it will be freed.
5664 void free_netdev(struct net_device
*dev
)
5666 struct napi_struct
*p
, *n
;
5668 release_net(dev_net(dev
));
5675 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
5677 /* Flush device addresses */
5678 dev_addr_flush(dev
);
5680 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
5683 free_percpu(dev
->pcpu_refcnt
);
5684 dev
->pcpu_refcnt
= NULL
;
5686 /* Compatibility with error handling in drivers */
5687 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5688 kfree((char *)dev
- dev
->padded
);
5692 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
5693 dev
->reg_state
= NETREG_RELEASED
;
5695 /* will free via device release */
5696 put_device(&dev
->dev
);
5698 EXPORT_SYMBOL(free_netdev
);
5701 * synchronize_net - Synchronize with packet receive processing
5703 * Wait for packets currently being received to be done.
5704 * Does not block later packets from starting.
5706 void synchronize_net(void)
5709 if (rtnl_is_locked())
5710 synchronize_rcu_expedited();
5714 EXPORT_SYMBOL(synchronize_net
);
5717 * unregister_netdevice_queue - remove device from the kernel
5721 * This function shuts down a device interface and removes it
5722 * from the kernel tables.
5723 * If head not NULL, device is queued to be unregistered later.
5725 * Callers must hold the rtnl semaphore. You may want
5726 * unregister_netdev() instead of this.
5729 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
5734 list_move_tail(&dev
->unreg_list
, head
);
5736 rollback_registered(dev
);
5737 /* Finish processing unregister after unlock */
5741 EXPORT_SYMBOL(unregister_netdevice_queue
);
5744 * unregister_netdevice_many - unregister many devices
5745 * @head: list of devices
5747 void unregister_netdevice_many(struct list_head
*head
)
5749 struct net_device
*dev
;
5751 if (!list_empty(head
)) {
5752 rollback_registered_many(head
);
5753 list_for_each_entry(dev
, head
, unreg_list
)
5757 EXPORT_SYMBOL(unregister_netdevice_many
);
5760 * unregister_netdev - remove device from the kernel
5763 * This function shuts down a device interface and removes it
5764 * from the kernel tables.
5766 * This is just a wrapper for unregister_netdevice that takes
5767 * the rtnl semaphore. In general you want to use this and not
5768 * unregister_netdevice.
5770 void unregister_netdev(struct net_device
*dev
)
5773 unregister_netdevice(dev
);
5776 EXPORT_SYMBOL(unregister_netdev
);
5779 * dev_change_net_namespace - move device to different nethost namespace
5781 * @net: network namespace
5782 * @pat: If not NULL name pattern to try if the current device name
5783 * is already taken in the destination network namespace.
5785 * This function shuts down a device interface and moves it
5786 * to a new network namespace. On success 0 is returned, on
5787 * a failure a netagive errno code is returned.
5789 * Callers must hold the rtnl semaphore.
5792 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
5798 /* Don't allow namespace local devices to be moved. */
5800 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
5803 /* Ensure the device has been registrered */
5804 if (dev
->reg_state
!= NETREG_REGISTERED
)
5807 /* Get out if there is nothing todo */
5809 if (net_eq(dev_net(dev
), net
))
5812 /* Pick the destination device name, and ensure
5813 * we can use it in the destination network namespace.
5816 if (__dev_get_by_name(net
, dev
->name
)) {
5817 /* We get here if we can't use the current device name */
5820 if (dev_get_valid_name(net
, dev
, pat
) < 0)
5825 * And now a mini version of register_netdevice unregister_netdevice.
5828 /* If device is running close it first. */
5831 /* And unlink it from device chain */
5833 unlist_netdevice(dev
);
5837 /* Shutdown queueing discipline. */
5840 /* Notify protocols, that we are about to destroy
5841 this device. They should clean all the things.
5843 Note that dev->reg_state stays at NETREG_REGISTERED.
5844 This is wanted because this way 8021q and macvlan know
5845 the device is just moving and can keep their slaves up.
5847 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5849 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5850 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
5853 * Flush the unicast and multicast chains
5858 /* Send a netdev-removed uevent to the old namespace */
5859 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
5861 /* Actually switch the network namespace */
5862 dev_net_set(dev
, net
);
5864 /* If there is an ifindex conflict assign a new one */
5865 if (__dev_get_by_index(net
, dev
->ifindex
)) {
5866 int iflink
= (dev
->iflink
== dev
->ifindex
);
5867 dev
->ifindex
= dev_new_index(net
);
5869 dev
->iflink
= dev
->ifindex
;
5872 /* Send a netdev-add uevent to the new namespace */
5873 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
5875 /* Fixup kobjects */
5876 err
= device_rename(&dev
->dev
, dev
->name
);
5879 /* Add the device back in the hashes */
5880 list_netdevice(dev
);
5882 /* Notify protocols, that a new device appeared. */
5883 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5886 * Prevent userspace races by waiting until the network
5887 * device is fully setup before sending notifications.
5889 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5896 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
5898 static int dev_cpu_callback(struct notifier_block
*nfb
,
5899 unsigned long action
,
5902 struct sk_buff
**list_skb
;
5903 struct sk_buff
*skb
;
5904 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
5905 struct softnet_data
*sd
, *oldsd
;
5907 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
5910 local_irq_disable();
5911 cpu
= smp_processor_id();
5912 sd
= &per_cpu(softnet_data
, cpu
);
5913 oldsd
= &per_cpu(softnet_data
, oldcpu
);
5915 /* Find end of our completion_queue. */
5916 list_skb
= &sd
->completion_queue
;
5918 list_skb
= &(*list_skb
)->next
;
5919 /* Append completion queue from offline CPU. */
5920 *list_skb
= oldsd
->completion_queue
;
5921 oldsd
->completion_queue
= NULL
;
5923 /* Append output queue from offline CPU. */
5924 if (oldsd
->output_queue
) {
5925 *sd
->output_queue_tailp
= oldsd
->output_queue
;
5926 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
5927 oldsd
->output_queue
= NULL
;
5928 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
5930 /* Append NAPI poll list from offline CPU. */
5931 if (!list_empty(&oldsd
->poll_list
)) {
5932 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
5933 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
5936 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
5939 /* Process offline CPU's input_pkt_queue */
5940 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
5942 input_queue_head_incr(oldsd
);
5944 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
5946 input_queue_head_incr(oldsd
);
5954 * netdev_increment_features - increment feature set by one
5955 * @all: current feature set
5956 * @one: new feature set
5957 * @mask: mask feature set
5959 * Computes a new feature set after adding a device with feature set
5960 * @one to the master device with current feature set @all. Will not
5961 * enable anything that is off in @mask. Returns the new feature set.
5963 netdev_features_t
netdev_increment_features(netdev_features_t all
,
5964 netdev_features_t one
, netdev_features_t mask
)
5966 if (mask
& NETIF_F_GEN_CSUM
)
5967 mask
|= NETIF_F_ALL_CSUM
;
5968 mask
|= NETIF_F_VLAN_CHALLENGED
;
5970 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
5971 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
5973 /* If one device supports hw checksumming, set for all. */
5974 if (all
& NETIF_F_GEN_CSUM
)
5975 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
5979 EXPORT_SYMBOL(netdev_increment_features
);
5981 static struct hlist_head
*netdev_create_hash(void)
5984 struct hlist_head
*hash
;
5986 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
5988 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
5989 INIT_HLIST_HEAD(&hash
[i
]);
5994 /* Initialize per network namespace state */
5995 static int __net_init
netdev_init(struct net
*net
)
5997 if (net
!= &init_net
)
5998 INIT_LIST_HEAD(&net
->dev_base_head
);
6000 net
->dev_name_head
= netdev_create_hash();
6001 if (net
->dev_name_head
== NULL
)
6004 net
->dev_index_head
= netdev_create_hash();
6005 if (net
->dev_index_head
== NULL
)
6011 kfree(net
->dev_name_head
);
6017 * netdev_drivername - network driver for the device
6018 * @dev: network device
6020 * Determine network driver for device.
6022 const char *netdev_drivername(const struct net_device
*dev
)
6024 const struct device_driver
*driver
;
6025 const struct device
*parent
;
6026 const char *empty
= "";
6028 parent
= dev
->dev
.parent
;
6032 driver
= parent
->driver
;
6033 if (driver
&& driver
->name
)
6034 return driver
->name
;
6038 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6039 struct va_format
*vaf
)
6043 if (dev
&& dev
->dev
.parent
) {
6044 r
= dev_printk_emit(level
[1] - '0',
6047 dev_driver_string(dev
->dev
.parent
),
6048 dev_name(dev
->dev
.parent
),
6049 netdev_name(dev
), vaf
);
6051 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6053 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6059 int netdev_printk(const char *level
, const struct net_device
*dev
,
6060 const char *format
, ...)
6062 struct va_format vaf
;
6066 va_start(args
, format
);
6071 r
= __netdev_printk(level
, dev
, &vaf
);
6077 EXPORT_SYMBOL(netdev_printk
);
6079 #define define_netdev_printk_level(func, level) \
6080 int func(const struct net_device *dev, const char *fmt, ...) \
6083 struct va_format vaf; \
6086 va_start(args, fmt); \
6091 r = __netdev_printk(level, dev, &vaf); \
6097 EXPORT_SYMBOL(func);
6099 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6100 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6101 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6102 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6103 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6104 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6105 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6107 static void __net_exit
netdev_exit(struct net
*net
)
6109 kfree(net
->dev_name_head
);
6110 kfree(net
->dev_index_head
);
6113 static struct pernet_operations __net_initdata netdev_net_ops
= {
6114 .init
= netdev_init
,
6115 .exit
= netdev_exit
,
6118 static void __net_exit
default_device_exit(struct net
*net
)
6120 struct net_device
*dev
, *aux
;
6122 * Push all migratable network devices back to the
6123 * initial network namespace
6126 for_each_netdev_safe(net
, dev
, aux
) {
6128 char fb_name
[IFNAMSIZ
];
6130 /* Ignore unmoveable devices (i.e. loopback) */
6131 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6134 /* Leave virtual devices for the generic cleanup */
6135 if (dev
->rtnl_link_ops
)
6138 /* Push remaining network devices to init_net */
6139 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6140 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6142 pr_emerg("%s: failed to move %s to init_net: %d\n",
6143 __func__
, dev
->name
, err
);
6150 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6152 /* At exit all network devices most be removed from a network
6153 * namespace. Do this in the reverse order of registration.
6154 * Do this across as many network namespaces as possible to
6155 * improve batching efficiency.
6157 struct net_device
*dev
;
6159 LIST_HEAD(dev_kill_list
);
6162 list_for_each_entry(net
, net_list
, exit_list
) {
6163 for_each_netdev_reverse(net
, dev
) {
6164 if (dev
->rtnl_link_ops
)
6165 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6167 unregister_netdevice_queue(dev
, &dev_kill_list
);
6170 unregister_netdevice_many(&dev_kill_list
);
6171 list_del(&dev_kill_list
);
6175 static struct pernet_operations __net_initdata default_device_ops
= {
6176 .exit
= default_device_exit
,
6177 .exit_batch
= default_device_exit_batch
,
6181 * Initialize the DEV module. At boot time this walks the device list and
6182 * unhooks any devices that fail to initialise (normally hardware not
6183 * present) and leaves us with a valid list of present and active devices.
6188 * This is called single threaded during boot, so no need
6189 * to take the rtnl semaphore.
6191 static int __init
net_dev_init(void)
6193 int i
, rc
= -ENOMEM
;
6195 BUG_ON(!dev_boot_phase
);
6197 if (dev_proc_init())
6200 if (netdev_kobject_init())
6203 INIT_LIST_HEAD(&ptype_all
);
6204 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6205 INIT_LIST_HEAD(&ptype_base
[i
]);
6207 INIT_LIST_HEAD(&offload_base
);
6209 if (register_pernet_subsys(&netdev_net_ops
))
6213 * Initialise the packet receive queues.
6216 for_each_possible_cpu(i
) {
6217 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6219 memset(sd
, 0, sizeof(*sd
));
6220 skb_queue_head_init(&sd
->input_pkt_queue
);
6221 skb_queue_head_init(&sd
->process_queue
);
6222 sd
->completion_queue
= NULL
;
6223 INIT_LIST_HEAD(&sd
->poll_list
);
6224 sd
->output_queue
= NULL
;
6225 sd
->output_queue_tailp
= &sd
->output_queue
;
6227 sd
->csd
.func
= rps_trigger_softirq
;
6233 sd
->backlog
.poll
= process_backlog
;
6234 sd
->backlog
.weight
= weight_p
;
6235 sd
->backlog
.gro_list
= NULL
;
6236 sd
->backlog
.gro_count
= 0;
6241 /* The loopback device is special if any other network devices
6242 * is present in a network namespace the loopback device must
6243 * be present. Since we now dynamically allocate and free the
6244 * loopback device ensure this invariant is maintained by
6245 * keeping the loopback device as the first device on the
6246 * list of network devices. Ensuring the loopback devices
6247 * is the first device that appears and the last network device
6250 if (register_pernet_device(&loopback_net_ops
))
6253 if (register_pernet_device(&default_device_ops
))
6256 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6257 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6259 hotcpu_notifier(dev_cpu_callback
, 0);
6266 subsys_initcall(net_dev_init
);