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"
136 #include <linux/ftrace_event.h>
139 /* Instead of increasing this, you should create a hash table. */
140 #define MAX_GRO_SKBS 8
142 /* This should be increased if a protocol with a bigger head is added. */
143 #define GRO_MAX_HEAD (MAX_HEADER + 128)
145 static DEFINE_SPINLOCK(ptype_lock
);
146 static DEFINE_SPINLOCK(offload_lock
);
147 struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
148 struct list_head ptype_all __read_mostly
; /* Taps */
149 static struct list_head offload_base __read_mostly
;
152 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
155 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
157 * Writers must hold the rtnl semaphore while they loop through the
158 * dev_base_head list, and hold dev_base_lock for writing when they do the
159 * actual updates. This allows pure readers to access the list even
160 * while a writer is preparing to update it.
162 * To put it another way, dev_base_lock is held for writing only to
163 * protect against pure readers; the rtnl semaphore provides the
164 * protection against other writers.
166 * See, for example usages, register_netdevice() and
167 * unregister_netdevice(), which must be called with the rtnl
170 DEFINE_RWLOCK(dev_base_lock
);
171 EXPORT_SYMBOL(dev_base_lock
);
173 seqcount_t devnet_rename_seq
;
175 static inline void dev_base_seq_inc(struct net
*net
)
177 while (++net
->dev_base_seq
== 0);
180 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
182 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
184 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
187 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
189 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
192 static inline void rps_lock(struct softnet_data
*sd
)
195 spin_lock(&sd
->input_pkt_queue
.lock
);
199 static inline void rps_unlock(struct softnet_data
*sd
)
202 spin_unlock(&sd
->input_pkt_queue
.lock
);
206 /* Device list insertion */
207 static void list_netdevice(struct net_device
*dev
)
209 struct net
*net
= dev_net(dev
);
213 write_lock_bh(&dev_base_lock
);
214 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
215 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
216 hlist_add_head_rcu(&dev
->index_hlist
,
217 dev_index_hash(net
, dev
->ifindex
));
218 write_unlock_bh(&dev_base_lock
);
220 dev_base_seq_inc(net
);
223 /* Device list removal
224 * caller must respect a RCU grace period before freeing/reusing dev
226 static void unlist_netdevice(struct net_device
*dev
)
230 /* Unlink dev from the device chain */
231 write_lock_bh(&dev_base_lock
);
232 list_del_rcu(&dev
->dev_list
);
233 hlist_del_rcu(&dev
->name_hlist
);
234 hlist_del_rcu(&dev
->index_hlist
);
235 write_unlock_bh(&dev_base_lock
);
237 dev_base_seq_inc(dev_net(dev
));
244 static RAW_NOTIFIER_HEAD(netdev_chain
);
247 * Device drivers call our routines to queue packets here. We empty the
248 * queue in the local softnet handler.
251 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
252 EXPORT_PER_CPU_SYMBOL(softnet_data
);
254 #ifdef CONFIG_LOCKDEP
256 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
257 * according to dev->type
259 static const unsigned short netdev_lock_type
[] =
260 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
261 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
262 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
263 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
264 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
265 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
266 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
267 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
268 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
269 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
270 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
271 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
272 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
273 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
274 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
276 static const char *const netdev_lock_name
[] =
277 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
278 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
279 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
280 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
281 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
282 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
283 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
284 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
285 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
286 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
287 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
288 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
289 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
290 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
291 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
293 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
294 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
296 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
300 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
301 if (netdev_lock_type
[i
] == dev_type
)
303 /* the last key is used by default */
304 return ARRAY_SIZE(netdev_lock_type
) - 1;
307 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
308 unsigned short dev_type
)
312 i
= netdev_lock_pos(dev_type
);
313 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
314 netdev_lock_name
[i
]);
317 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
321 i
= netdev_lock_pos(dev
->type
);
322 lockdep_set_class_and_name(&dev
->addr_list_lock
,
323 &netdev_addr_lock_key
[i
],
324 netdev_lock_name
[i
]);
327 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
328 unsigned short dev_type
)
331 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
336 /*******************************************************************************
338 Protocol management and registration routines
340 *******************************************************************************/
343 * Add a protocol ID to the list. Now that the input handler is
344 * smarter we can dispense with all the messy stuff that used to be
347 * BEWARE!!! Protocol handlers, mangling input packets,
348 * MUST BE last in hash buckets and checking protocol handlers
349 * MUST start from promiscuous ptype_all chain in net_bh.
350 * It is true now, do not change it.
351 * Explanation follows: if protocol handler, mangling packet, will
352 * be the first on list, it is not able to sense, that packet
353 * is cloned and should be copied-on-write, so that it will
354 * change it and subsequent readers will get broken packet.
358 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
360 if (pt
->type
== htons(ETH_P_ALL
))
363 return &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
367 * dev_add_pack - add packet handler
368 * @pt: packet type declaration
370 * Add a protocol handler to the networking stack. The passed &packet_type
371 * is linked into kernel lists and may not be freed until it has been
372 * removed from the kernel lists.
374 * This call does not sleep therefore it can not
375 * guarantee all CPU's that are in middle of receiving packets
376 * will see the new packet type (until the next received packet).
379 void dev_add_pack(struct packet_type
*pt
)
381 struct list_head
*head
= ptype_head(pt
);
383 spin_lock(&ptype_lock
);
384 list_add_rcu(&pt
->list
, head
);
385 spin_unlock(&ptype_lock
);
387 EXPORT_SYMBOL(dev_add_pack
);
390 * __dev_remove_pack - remove packet handler
391 * @pt: packet type declaration
393 * Remove a protocol handler that was previously added to the kernel
394 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
395 * from the kernel lists and can be freed or reused once this function
398 * The packet type might still be in use by receivers
399 * and must not be freed until after all the CPU's have gone
400 * through a quiescent state.
402 void __dev_remove_pack(struct packet_type
*pt
)
404 struct list_head
*head
= ptype_head(pt
);
405 struct packet_type
*pt1
;
407 spin_lock(&ptype_lock
);
409 list_for_each_entry(pt1
, head
, list
) {
411 list_del_rcu(&pt
->list
);
416 pr_warn("dev_remove_pack: %p not found\n", pt
);
418 spin_unlock(&ptype_lock
);
420 EXPORT_SYMBOL(__dev_remove_pack
);
423 * dev_remove_pack - remove packet handler
424 * @pt: packet type declaration
426 * Remove a protocol handler that was previously added to the kernel
427 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
428 * from the kernel lists and can be freed or reused once this function
431 * This call sleeps to guarantee that no CPU is looking at the packet
434 void dev_remove_pack(struct packet_type
*pt
)
436 __dev_remove_pack(pt
);
440 EXPORT_SYMBOL(dev_remove_pack
);
444 * dev_add_offload - register offload handlers
445 * @po: protocol offload declaration
447 * Add protocol offload handlers to the networking stack. The passed
448 * &proto_offload is linked into kernel lists and may not be freed until
449 * it has been removed from the kernel lists.
451 * This call does not sleep therefore it can not
452 * guarantee all CPU's that are in middle of receiving packets
453 * will see the new offload handlers (until the next received packet).
455 void dev_add_offload(struct packet_offload
*po
)
457 struct list_head
*head
= &offload_base
;
459 spin_lock(&offload_lock
);
460 list_add_rcu(&po
->list
, head
);
461 spin_unlock(&offload_lock
);
463 EXPORT_SYMBOL(dev_add_offload
);
466 * __dev_remove_offload - remove offload handler
467 * @po: packet offload declaration
469 * Remove a protocol offload handler that was previously added to the
470 * kernel offload handlers by dev_add_offload(). The passed &offload_type
471 * is removed from the kernel lists and can be freed or reused once this
474 * The packet type might still be in use by receivers
475 * and must not be freed until after all the CPU's have gone
476 * through a quiescent state.
478 void __dev_remove_offload(struct packet_offload
*po
)
480 struct list_head
*head
= &offload_base
;
481 struct packet_offload
*po1
;
483 spin_lock(&offload_lock
);
485 list_for_each_entry(po1
, head
, list
) {
487 list_del_rcu(&po
->list
);
492 pr_warn("dev_remove_offload: %p not found\n", po
);
494 spin_unlock(&offload_lock
);
496 EXPORT_SYMBOL(__dev_remove_offload
);
499 * dev_remove_offload - remove packet offload handler
500 * @po: packet offload declaration
502 * Remove a packet offload handler that was previously added to the kernel
503 * offload handlers by dev_add_offload(). The passed &offload_type is
504 * removed from the kernel lists and can be freed or reused once this
507 * This call sleeps to guarantee that no CPU is looking at the packet
510 void dev_remove_offload(struct packet_offload
*po
)
512 __dev_remove_offload(po
);
516 EXPORT_SYMBOL(dev_remove_offload
);
518 /******************************************************************************
520 Device Boot-time Settings Routines
522 *******************************************************************************/
524 /* Boot time configuration table */
525 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
528 * netdev_boot_setup_add - add new setup entry
529 * @name: name of the device
530 * @map: configured settings for the device
532 * Adds new setup entry to the dev_boot_setup list. The function
533 * returns 0 on error and 1 on success. This is a generic routine to
536 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
538 struct netdev_boot_setup
*s
;
542 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
543 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
544 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
545 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
546 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
551 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
555 * netdev_boot_setup_check - check boot time settings
556 * @dev: the netdevice
558 * Check boot time settings for the device.
559 * The found settings are set for the device to be used
560 * later in the device probing.
561 * Returns 0 if no settings found, 1 if they are.
563 int netdev_boot_setup_check(struct net_device
*dev
)
565 struct netdev_boot_setup
*s
= dev_boot_setup
;
568 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
569 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
570 !strcmp(dev
->name
, s
[i
].name
)) {
571 dev
->irq
= s
[i
].map
.irq
;
572 dev
->base_addr
= s
[i
].map
.base_addr
;
573 dev
->mem_start
= s
[i
].map
.mem_start
;
574 dev
->mem_end
= s
[i
].map
.mem_end
;
580 EXPORT_SYMBOL(netdev_boot_setup_check
);
584 * netdev_boot_base - get address from boot time settings
585 * @prefix: prefix for network device
586 * @unit: id for network device
588 * Check boot time settings for the base address of device.
589 * The found settings are set for the device to be used
590 * later in the device probing.
591 * Returns 0 if no settings found.
593 unsigned long netdev_boot_base(const char *prefix
, int unit
)
595 const struct netdev_boot_setup
*s
= dev_boot_setup
;
599 sprintf(name
, "%s%d", prefix
, unit
);
602 * If device already registered then return base of 1
603 * to indicate not to probe for this interface
605 if (__dev_get_by_name(&init_net
, name
))
608 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
609 if (!strcmp(name
, s
[i
].name
))
610 return s
[i
].map
.base_addr
;
615 * Saves at boot time configured settings for any netdevice.
617 int __init
netdev_boot_setup(char *str
)
622 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
627 memset(&map
, 0, sizeof(map
));
631 map
.base_addr
= ints
[2];
633 map
.mem_start
= ints
[3];
635 map
.mem_end
= ints
[4];
637 /* Add new entry to the list */
638 return netdev_boot_setup_add(str
, &map
);
641 __setup("netdev=", netdev_boot_setup
);
643 /*******************************************************************************
645 Device Interface Subroutines
647 *******************************************************************************/
650 * __dev_get_by_name - find a device by its name
651 * @net: the applicable net namespace
652 * @name: name to find
654 * Find an interface by name. Must be called under RTNL semaphore
655 * or @dev_base_lock. If the name is found a pointer to the device
656 * is returned. If the name is not found then %NULL is returned. The
657 * reference counters are not incremented so the caller must be
658 * careful with locks.
661 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
663 struct net_device
*dev
;
664 struct hlist_head
*head
= dev_name_hash(net
, name
);
666 hlist_for_each_entry(dev
, head
, name_hlist
)
667 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
672 EXPORT_SYMBOL(__dev_get_by_name
);
675 * dev_get_by_name_rcu - find a device by its name
676 * @net: the applicable net namespace
677 * @name: name to find
679 * Find an interface by name.
680 * If the name is found a pointer to the device is returned.
681 * If the name is not found then %NULL is returned.
682 * The reference counters are not incremented so the caller must be
683 * careful with locks. The caller must hold RCU lock.
686 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
688 struct net_device
*dev
;
689 struct hlist_head
*head
= dev_name_hash(net
, name
);
691 hlist_for_each_entry_rcu(dev
, head
, name_hlist
)
692 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
697 EXPORT_SYMBOL(dev_get_by_name_rcu
);
700 * dev_get_by_name - find a device by its name
701 * @net: the applicable net namespace
702 * @name: name to find
704 * Find an interface by name. This can be called from any
705 * context and does its own locking. The returned handle has
706 * the usage count incremented and the caller must use dev_put() to
707 * release it when it is no longer needed. %NULL is returned if no
708 * matching device is found.
711 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
713 struct net_device
*dev
;
716 dev
= dev_get_by_name_rcu(net
, name
);
722 EXPORT_SYMBOL(dev_get_by_name
);
725 * __dev_get_by_index - find a device by its ifindex
726 * @net: the applicable net namespace
727 * @ifindex: index of device
729 * Search for an interface by index. Returns %NULL if the device
730 * is not found or a pointer to the device. The device has not
731 * had its reference counter increased so the caller must be careful
732 * about locking. The caller must hold either the RTNL semaphore
736 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
738 struct net_device
*dev
;
739 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
741 hlist_for_each_entry(dev
, head
, index_hlist
)
742 if (dev
->ifindex
== ifindex
)
747 EXPORT_SYMBOL(__dev_get_by_index
);
750 * dev_get_by_index_rcu - find a device by its ifindex
751 * @net: the applicable net namespace
752 * @ifindex: index of device
754 * Search for an interface by index. Returns %NULL if the device
755 * is not found or a pointer to the device. The device has not
756 * had its reference counter increased so the caller must be careful
757 * about locking. The caller must hold RCU lock.
760 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
762 struct net_device
*dev
;
763 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
765 hlist_for_each_entry_rcu(dev
, head
, index_hlist
)
766 if (dev
->ifindex
== ifindex
)
771 EXPORT_SYMBOL(dev_get_by_index_rcu
);
775 * dev_get_by_index - find a device by its ifindex
776 * @net: the applicable net namespace
777 * @ifindex: index of device
779 * Search for an interface by index. Returns NULL if the device
780 * is not found or a pointer to the device. The device returned has
781 * had a reference added and the pointer is safe until the user calls
782 * dev_put to indicate they have finished with it.
785 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
787 struct net_device
*dev
;
790 dev
= dev_get_by_index_rcu(net
, ifindex
);
796 EXPORT_SYMBOL(dev_get_by_index
);
799 * netdev_get_name - get a netdevice name, knowing its ifindex.
800 * @net: network namespace
801 * @name: a pointer to the buffer where the name will be stored.
802 * @ifindex: the ifindex of the interface to get the name from.
804 * The use of raw_seqcount_begin() and cond_resched() before
805 * retrying is required as we want to give the writers a chance
806 * to complete when CONFIG_PREEMPT is not set.
808 int netdev_get_name(struct net
*net
, char *name
, int ifindex
)
810 struct net_device
*dev
;
814 seq
= raw_seqcount_begin(&devnet_rename_seq
);
816 dev
= dev_get_by_index_rcu(net
, ifindex
);
822 strcpy(name
, dev
->name
);
824 if (read_seqcount_retry(&devnet_rename_seq
, seq
)) {
833 * dev_getbyhwaddr_rcu - find a device by its hardware address
834 * @net: the applicable net namespace
835 * @type: media type of device
836 * @ha: hardware address
838 * Search for an interface by MAC address. Returns NULL if the device
839 * is not found or a pointer to the device.
840 * The caller must hold RCU or RTNL.
841 * The returned device has not had its ref count increased
842 * and the caller must therefore be careful about locking
846 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
849 struct net_device
*dev
;
851 for_each_netdev_rcu(net
, dev
)
852 if (dev
->type
== type
&&
853 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
858 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
860 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
862 struct net_device
*dev
;
865 for_each_netdev(net
, dev
)
866 if (dev
->type
== type
)
871 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
873 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
875 struct net_device
*dev
, *ret
= NULL
;
878 for_each_netdev_rcu(net
, dev
)
879 if (dev
->type
== type
) {
887 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
890 * dev_get_by_flags_rcu - find any device with given flags
891 * @net: the applicable net namespace
892 * @if_flags: IFF_* values
893 * @mask: bitmask of bits in if_flags to check
895 * Search for any interface with the given flags. Returns NULL if a device
896 * is not found or a pointer to the device. Must be called inside
897 * rcu_read_lock(), and result refcount is unchanged.
900 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
903 struct net_device
*dev
, *ret
;
906 for_each_netdev_rcu(net
, dev
) {
907 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
914 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
917 * dev_valid_name - check if name is okay for network device
920 * Network device names need to be valid file names to
921 * to allow sysfs to work. We also disallow any kind of
924 bool dev_valid_name(const char *name
)
928 if (strlen(name
) >= IFNAMSIZ
)
930 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
934 if (*name
== '/' || isspace(*name
))
940 EXPORT_SYMBOL(dev_valid_name
);
943 * __dev_alloc_name - allocate a name for a device
944 * @net: network namespace to allocate the device name in
945 * @name: name format string
946 * @buf: scratch buffer and result name string
948 * Passed a format string - eg "lt%d" it will try and find a suitable
949 * id. It scans list of devices to build up a free map, then chooses
950 * the first empty slot. The caller must hold the dev_base or rtnl lock
951 * while allocating the name and adding the device in order to avoid
953 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
954 * Returns the number of the unit assigned or a negative errno code.
957 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
961 const int max_netdevices
= 8*PAGE_SIZE
;
962 unsigned long *inuse
;
963 struct net_device
*d
;
965 p
= strnchr(name
, IFNAMSIZ
-1, '%');
968 * Verify the string as this thing may have come from
969 * the user. There must be either one "%d" and no other "%"
972 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
975 /* Use one page as a bit array of possible slots */
976 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
980 for_each_netdev(net
, d
) {
981 if (!sscanf(d
->name
, name
, &i
))
983 if (i
< 0 || i
>= max_netdevices
)
986 /* avoid cases where sscanf is not exact inverse of printf */
987 snprintf(buf
, IFNAMSIZ
, name
, i
);
988 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
992 i
= find_first_zero_bit(inuse
, max_netdevices
);
993 free_page((unsigned long) inuse
);
997 snprintf(buf
, IFNAMSIZ
, name
, i
);
998 if (!__dev_get_by_name(net
, buf
))
1001 /* It is possible to run out of possible slots
1002 * when the name is long and there isn't enough space left
1003 * for the digits, or if all bits are used.
1009 * dev_alloc_name - allocate a name for a device
1011 * @name: name format string
1013 * Passed a format string - eg "lt%d" it will try and find a suitable
1014 * id. It scans list of devices to build up a free map, then chooses
1015 * the first empty slot. The caller must hold the dev_base or rtnl lock
1016 * while allocating the name and adding the device in order to avoid
1018 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1019 * Returns the number of the unit assigned or a negative errno code.
1022 int dev_alloc_name(struct net_device
*dev
, const char *name
)
1028 BUG_ON(!dev_net(dev
));
1030 ret
= __dev_alloc_name(net
, name
, buf
);
1032 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1035 EXPORT_SYMBOL(dev_alloc_name
);
1037 static int dev_alloc_name_ns(struct net
*net
,
1038 struct net_device
*dev
,
1044 ret
= __dev_alloc_name(net
, name
, buf
);
1046 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
1050 static int dev_get_valid_name(struct net
*net
,
1051 struct net_device
*dev
,
1056 if (!dev_valid_name(name
))
1059 if (strchr(name
, '%'))
1060 return dev_alloc_name_ns(net
, dev
, name
);
1061 else if (__dev_get_by_name(net
, name
))
1063 else if (dev
->name
!= name
)
1064 strlcpy(dev
->name
, name
, IFNAMSIZ
);
1070 * dev_change_name - change name of a device
1072 * @newname: name (or format string) must be at least IFNAMSIZ
1074 * Change name of a device, can pass format strings "eth%d".
1077 int dev_change_name(struct net_device
*dev
, const char *newname
)
1079 char oldname
[IFNAMSIZ
];
1085 BUG_ON(!dev_net(dev
));
1088 if (dev
->flags
& IFF_UP
)
1091 write_seqcount_begin(&devnet_rename_seq
);
1093 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0) {
1094 write_seqcount_end(&devnet_rename_seq
);
1098 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1100 err
= dev_get_valid_name(net
, dev
, newname
);
1102 write_seqcount_end(&devnet_rename_seq
);
1107 ret
= device_rename(&dev
->dev
, dev
->name
);
1109 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1110 write_seqcount_end(&devnet_rename_seq
);
1114 write_seqcount_end(&devnet_rename_seq
);
1116 write_lock_bh(&dev_base_lock
);
1117 hlist_del_rcu(&dev
->name_hlist
);
1118 write_unlock_bh(&dev_base_lock
);
1122 write_lock_bh(&dev_base_lock
);
1123 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1124 write_unlock_bh(&dev_base_lock
);
1126 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1127 ret
= notifier_to_errno(ret
);
1130 /* err >= 0 after dev_alloc_name() or stores the first errno */
1133 write_seqcount_begin(&devnet_rename_seq
);
1134 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1137 pr_err("%s: name change rollback failed: %d\n",
1146 * dev_set_alias - change ifalias of a device
1148 * @alias: name up to IFALIASZ
1149 * @len: limit of bytes to copy from info
1151 * Set ifalias for a device,
1153 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1159 if (len
>= IFALIASZ
)
1163 kfree(dev
->ifalias
);
1164 dev
->ifalias
= NULL
;
1168 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1171 dev
->ifalias
= new_ifalias
;
1173 strlcpy(dev
->ifalias
, alias
, len
+1);
1179 * netdev_features_change - device changes features
1180 * @dev: device to cause notification
1182 * Called to indicate a device has changed features.
1184 void netdev_features_change(struct net_device
*dev
)
1186 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1188 EXPORT_SYMBOL(netdev_features_change
);
1191 * netdev_state_change - device changes state
1192 * @dev: device to cause notification
1194 * Called to indicate a device has changed state. This function calls
1195 * the notifier chains for netdev_chain and sends a NEWLINK message
1196 * to the routing socket.
1198 void netdev_state_change(struct net_device
*dev
)
1200 if (dev
->flags
& IFF_UP
) {
1201 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1202 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1205 EXPORT_SYMBOL(netdev_state_change
);
1208 * netdev_notify_peers - notify network peers about existence of @dev
1209 * @dev: network device
1211 * Generate traffic such that interested network peers are aware of
1212 * @dev, such as by generating a gratuitous ARP. This may be used when
1213 * a device wants to inform the rest of the network about some sort of
1214 * reconfiguration such as a failover event or virtual machine
1217 void netdev_notify_peers(struct net_device
*dev
)
1220 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1223 EXPORT_SYMBOL(netdev_notify_peers
);
1225 static int __dev_open(struct net_device
*dev
)
1227 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1232 if (!netif_device_present(dev
))
1235 /* Block netpoll from trying to do any rx path servicing.
1236 * If we don't do this there is a chance ndo_poll_controller
1237 * or ndo_poll may be running while we open the device
1239 ret
= netpoll_rx_disable(dev
);
1243 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1244 ret
= notifier_to_errno(ret
);
1248 set_bit(__LINK_STATE_START
, &dev
->state
);
1250 if (ops
->ndo_validate_addr
)
1251 ret
= ops
->ndo_validate_addr(dev
);
1253 if (!ret
&& ops
->ndo_open
)
1254 ret
= ops
->ndo_open(dev
);
1256 netpoll_rx_enable(dev
);
1259 clear_bit(__LINK_STATE_START
, &dev
->state
);
1261 dev
->flags
|= IFF_UP
;
1262 net_dmaengine_get();
1263 dev_set_rx_mode(dev
);
1265 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1272 * dev_open - prepare an interface for use.
1273 * @dev: device to open
1275 * Takes a device from down to up state. The device's private open
1276 * function is invoked and then the multicast lists are loaded. Finally
1277 * the device is moved into the up state and a %NETDEV_UP message is
1278 * sent to the netdev notifier chain.
1280 * Calling this function on an active interface is a nop. On a failure
1281 * a negative errno code is returned.
1283 int dev_open(struct net_device
*dev
)
1287 if (dev
->flags
& IFF_UP
)
1290 ret
= __dev_open(dev
);
1294 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1295 call_netdevice_notifiers(NETDEV_UP
, dev
);
1299 EXPORT_SYMBOL(dev_open
);
1301 static int __dev_close_many(struct list_head
*head
)
1303 struct net_device
*dev
;
1308 list_for_each_entry(dev
, head
, unreg_list
) {
1309 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1311 clear_bit(__LINK_STATE_START
, &dev
->state
);
1313 /* Synchronize to scheduled poll. We cannot touch poll list, it
1314 * can be even on different cpu. So just clear netif_running().
1316 * dev->stop() will invoke napi_disable() on all of it's
1317 * napi_struct instances on this device.
1319 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1322 dev_deactivate_many(head
);
1324 list_for_each_entry(dev
, head
, unreg_list
) {
1325 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1328 * Call the device specific close. This cannot fail.
1329 * Only if device is UP
1331 * We allow it to be called even after a DETACH hot-plug
1337 dev
->flags
&= ~IFF_UP
;
1338 net_dmaengine_put();
1344 static int __dev_close(struct net_device
*dev
)
1349 /* Temporarily disable netpoll until the interface is down */
1350 retval
= netpoll_rx_disable(dev
);
1354 list_add(&dev
->unreg_list
, &single
);
1355 retval
= __dev_close_many(&single
);
1358 netpoll_rx_enable(dev
);
1362 static int dev_close_many(struct list_head
*head
)
1364 struct net_device
*dev
, *tmp
;
1365 LIST_HEAD(tmp_list
);
1367 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
)
1368 if (!(dev
->flags
& IFF_UP
))
1369 list_move(&dev
->unreg_list
, &tmp_list
);
1371 __dev_close_many(head
);
1373 list_for_each_entry(dev
, head
, unreg_list
) {
1374 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1375 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1378 /* rollback_registered_many needs the complete original list */
1379 list_splice(&tmp_list
, head
);
1384 * dev_close - shutdown an interface.
1385 * @dev: device to shutdown
1387 * This function moves an active device into down state. A
1388 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1389 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1392 int dev_close(struct net_device
*dev
)
1395 if (dev
->flags
& IFF_UP
) {
1398 /* Block netpoll rx while the interface is going down */
1399 ret
= netpoll_rx_disable(dev
);
1403 list_add(&dev
->unreg_list
, &single
);
1404 dev_close_many(&single
);
1407 netpoll_rx_enable(dev
);
1411 EXPORT_SYMBOL(dev_close
);
1415 * dev_disable_lro - disable Large Receive Offload on a device
1418 * Disable Large Receive Offload (LRO) on a net device. Must be
1419 * called under RTNL. This is needed if received packets may be
1420 * forwarded to another interface.
1422 void dev_disable_lro(struct net_device
*dev
)
1425 * If we're trying to disable lro on a vlan device
1426 * use the underlying physical device instead
1428 if (is_vlan_dev(dev
))
1429 dev
= vlan_dev_real_dev(dev
);
1431 dev
->wanted_features
&= ~NETIF_F_LRO
;
1432 netdev_update_features(dev
);
1434 if (unlikely(dev
->features
& NETIF_F_LRO
))
1435 netdev_WARN(dev
, "failed to disable LRO!\n");
1437 EXPORT_SYMBOL(dev_disable_lro
);
1440 static int dev_boot_phase
= 1;
1443 * register_netdevice_notifier - register a network notifier block
1446 * Register a notifier to be called when network device events occur.
1447 * The notifier passed is linked into the kernel structures and must
1448 * not be reused until it has been unregistered. A negative errno code
1449 * is returned on a failure.
1451 * When registered all registration and up events are replayed
1452 * to the new notifier to allow device to have a race free
1453 * view of the network device list.
1456 int register_netdevice_notifier(struct notifier_block
*nb
)
1458 struct net_device
*dev
;
1459 struct net_device
*last
;
1464 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1470 for_each_netdev(net
, dev
) {
1471 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1472 err
= notifier_to_errno(err
);
1476 if (!(dev
->flags
& IFF_UP
))
1479 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1490 for_each_netdev(net
, dev
) {
1494 if (dev
->flags
& IFF_UP
) {
1495 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1496 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1498 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1503 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1506 EXPORT_SYMBOL(register_netdevice_notifier
);
1509 * unregister_netdevice_notifier - unregister a network notifier block
1512 * Unregister a notifier previously registered by
1513 * register_netdevice_notifier(). The notifier is unlinked into the
1514 * kernel structures and may then be reused. A negative errno code
1515 * is returned on a failure.
1517 * After unregistering unregister and down device events are synthesized
1518 * for all devices on the device list to the removed notifier to remove
1519 * the need for special case cleanup code.
1522 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1524 struct net_device
*dev
;
1529 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1534 for_each_netdev(net
, dev
) {
1535 if (dev
->flags
& IFF_UP
) {
1536 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1537 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1539 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1546 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1549 * call_netdevice_notifiers - call all network notifier blocks
1550 * @val: value passed unmodified to notifier function
1551 * @dev: net_device pointer passed unmodified to notifier function
1553 * Call all network notifier blocks. Parameters and return value
1554 * are as for raw_notifier_call_chain().
1557 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1560 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1562 EXPORT_SYMBOL(call_netdevice_notifiers
);
1564 static struct static_key netstamp_needed __read_mostly
;
1565 #ifdef HAVE_JUMP_LABEL
1566 /* We are not allowed to call static_key_slow_dec() from irq context
1567 * If net_disable_timestamp() is called from irq context, defer the
1568 * static_key_slow_dec() calls.
1570 static atomic_t netstamp_needed_deferred
;
1573 void net_enable_timestamp(void)
1575 #ifdef HAVE_JUMP_LABEL
1576 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1580 static_key_slow_dec(&netstamp_needed
);
1584 static_key_slow_inc(&netstamp_needed
);
1586 EXPORT_SYMBOL(net_enable_timestamp
);
1588 void net_disable_timestamp(void)
1590 #ifdef HAVE_JUMP_LABEL
1591 if (in_interrupt()) {
1592 atomic_inc(&netstamp_needed_deferred
);
1596 static_key_slow_dec(&netstamp_needed
);
1598 EXPORT_SYMBOL(net_disable_timestamp
);
1600 static inline void net_timestamp_set(struct sk_buff
*skb
)
1602 skb
->tstamp
.tv64
= 0;
1603 if (static_key_false(&netstamp_needed
))
1604 __net_timestamp(skb
);
1607 #define net_timestamp_check(COND, SKB) \
1608 if (static_key_false(&netstamp_needed)) { \
1609 if ((COND) && !(SKB)->tstamp.tv64) \
1610 __net_timestamp(SKB); \
1613 static inline bool is_skb_forwardable(struct net_device *dev,
1614 struct sk_buff
*skb
)
1618 if (!(dev
->flags
& IFF_UP
))
1621 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1622 if (skb
->len
<= len
)
1625 /* if TSO is enabled, we don't care about the length as the packet
1626 * could be forwarded without being segmented before
1628 if (skb_is_gso(skb
))
1635 * dev_forward_skb - loopback an skb to another netif
1637 * @dev: destination network device
1638 * @skb: buffer to forward
1641 * NET_RX_SUCCESS (no congestion)
1642 * NET_RX_DROP (packet was dropped, but freed)
1644 * dev_forward_skb can be used for injecting an skb from the
1645 * start_xmit function of one device into the receive queue
1646 * of another device.
1648 * The receiving device may be in another namespace, so
1649 * we have to clear all information in the skb that could
1650 * impact namespace isolation.
1652 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1654 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1655 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1656 atomic_long_inc(&dev
->rx_dropped
);
1664 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1665 atomic_long_inc(&dev
->rx_dropped
);
1672 skb
->tstamp
.tv64
= 0;
1673 skb
->pkt_type
= PACKET_HOST
;
1674 skb
->protocol
= eth_type_trans(skb
, dev
);
1678 nf_reset_trace(skb
);
1679 return netif_rx(skb
);
1681 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1683 static inline int deliver_skb(struct sk_buff
*skb
,
1684 struct packet_type
*pt_prev
,
1685 struct net_device
*orig_dev
)
1687 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1689 atomic_inc(&skb
->users
);
1690 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1693 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1695 if (!ptype
->af_packet_priv
|| !skb
->sk
)
1698 if (ptype
->id_match
)
1699 return ptype
->id_match(ptype
, skb
->sk
);
1700 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1707 * Support routine. Sends outgoing frames to any network
1708 * taps currently in use.
1711 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1713 struct packet_type
*ptype
;
1714 struct sk_buff
*skb2
= NULL
;
1715 struct packet_type
*pt_prev
= NULL
;
1718 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1719 /* Never send packets back to the socket
1720 * they originated from - MvS (miquels@drinkel.ow.org)
1722 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1723 (!skb_loop_sk(ptype
, skb
))) {
1725 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1730 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1734 net_timestamp_set(skb2
);
1736 /* skb->nh should be correctly
1737 set by sender, so that the second statement is
1738 just protection against buggy protocols.
1740 skb_reset_mac_header(skb2
);
1742 if (skb_network_header(skb2
) < skb2
->data
||
1743 skb2
->network_header
> skb2
->tail
) {
1744 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1745 ntohs(skb2
->protocol
),
1747 skb_reset_network_header(skb2
);
1750 skb2
->transport_header
= skb2
->network_header
;
1751 skb2
->pkt_type
= PACKET_OUTGOING
;
1756 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1761 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1762 * @dev: Network device
1763 * @txq: number of queues available
1765 * If real_num_tx_queues is changed the tc mappings may no longer be
1766 * valid. To resolve this verify the tc mapping remains valid and if
1767 * not NULL the mapping. With no priorities mapping to this
1768 * offset/count pair it will no longer be used. In the worst case TC0
1769 * is invalid nothing can be done so disable priority mappings. If is
1770 * expected that drivers will fix this mapping if they can before
1771 * calling netif_set_real_num_tx_queues.
1773 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1776 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1778 /* If TC0 is invalidated disable TC mapping */
1779 if (tc
->offset
+ tc
->count
> txq
) {
1780 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1785 /* Invalidated prio to tc mappings set to TC0 */
1786 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1787 int q
= netdev_get_prio_tc_map(dev
, i
);
1789 tc
= &dev
->tc_to_txq
[q
];
1790 if (tc
->offset
+ tc
->count
> txq
) {
1791 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1793 netdev_set_prio_tc_map(dev
, i
, 0);
1799 static DEFINE_MUTEX(xps_map_mutex
);
1800 #define xmap_dereference(P) \
1801 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1803 static struct xps_map
*remove_xps_queue(struct xps_dev_maps
*dev_maps
,
1806 struct xps_map
*map
= NULL
;
1810 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1812 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1813 if (map
->queues
[pos
] == index
) {
1815 map
->queues
[pos
] = map
->queues
[--map
->len
];
1817 RCU_INIT_POINTER(dev_maps
->cpu_map
[cpu
], NULL
);
1818 kfree_rcu(map
, rcu
);
1828 static void netif_reset_xps_queues_gt(struct net_device
*dev
, u16 index
)
1830 struct xps_dev_maps
*dev_maps
;
1832 bool active
= false;
1834 mutex_lock(&xps_map_mutex
);
1835 dev_maps
= xmap_dereference(dev
->xps_maps
);
1840 for_each_possible_cpu(cpu
) {
1841 for (i
= index
; i
< dev
->num_tx_queues
; i
++) {
1842 if (!remove_xps_queue(dev_maps
, cpu
, i
))
1845 if (i
== dev
->num_tx_queues
)
1850 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1851 kfree_rcu(dev_maps
, rcu
);
1854 for (i
= index
; i
< dev
->num_tx_queues
; i
++)
1855 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, i
),
1859 mutex_unlock(&xps_map_mutex
);
1862 static struct xps_map
*expand_xps_map(struct xps_map
*map
,
1865 struct xps_map
*new_map
;
1866 int alloc_len
= XPS_MIN_MAP_ALLOC
;
1869 for (pos
= 0; map
&& pos
< map
->len
; pos
++) {
1870 if (map
->queues
[pos
] != index
)
1875 /* Need to add queue to this CPU's existing map */
1877 if (pos
< map
->alloc_len
)
1880 alloc_len
= map
->alloc_len
* 2;
1883 /* Need to allocate new map to store queue on this CPU's map */
1884 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
), GFP_KERNEL
,
1889 for (i
= 0; i
< pos
; i
++)
1890 new_map
->queues
[i
] = map
->queues
[i
];
1891 new_map
->alloc_len
= alloc_len
;
1897 int netif_set_xps_queue(struct net_device
*dev
, struct cpumask
*mask
, u16 index
)
1899 struct xps_dev_maps
*dev_maps
, *new_dev_maps
= NULL
;
1900 struct xps_map
*map
, *new_map
;
1901 int maps_sz
= max_t(unsigned int, XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
);
1902 int cpu
, numa_node_id
= -2;
1903 bool active
= false;
1905 mutex_lock(&xps_map_mutex
);
1907 dev_maps
= xmap_dereference(dev
->xps_maps
);
1909 /* allocate memory for queue storage */
1910 for_each_online_cpu(cpu
) {
1911 if (!cpumask_test_cpu(cpu
, mask
))
1915 new_dev_maps
= kzalloc(maps_sz
, GFP_KERNEL
);
1916 if (!new_dev_maps
) {
1917 mutex_unlock(&xps_map_mutex
);
1921 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
1924 map
= expand_xps_map(map
, cpu
, index
);
1928 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1932 goto out_no_new_maps
;
1934 for_each_possible_cpu(cpu
) {
1935 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
)) {
1936 /* add queue to CPU maps */
1939 map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1940 while ((pos
< map
->len
) && (map
->queues
[pos
] != index
))
1943 if (pos
== map
->len
)
1944 map
->queues
[map
->len
++] = index
;
1946 if (numa_node_id
== -2)
1947 numa_node_id
= cpu_to_node(cpu
);
1948 else if (numa_node_id
!= cpu_to_node(cpu
))
1951 } else if (dev_maps
) {
1952 /* fill in the new device map from the old device map */
1953 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1954 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], map
);
1959 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
1961 /* Cleanup old maps */
1963 for_each_possible_cpu(cpu
) {
1964 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
1965 map
= xmap_dereference(dev_maps
->cpu_map
[cpu
]);
1966 if (map
&& map
!= new_map
)
1967 kfree_rcu(map
, rcu
);
1970 kfree_rcu(dev_maps
, rcu
);
1973 dev_maps
= new_dev_maps
;
1977 /* update Tx queue numa node */
1978 netdev_queue_numa_node_write(netdev_get_tx_queue(dev
, index
),
1979 (numa_node_id
>= 0) ? numa_node_id
:
1985 /* removes queue from unused CPUs */
1986 for_each_possible_cpu(cpu
) {
1987 if (cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
))
1990 if (remove_xps_queue(dev_maps
, cpu
, index
))
1994 /* free map if not active */
1996 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1997 kfree_rcu(dev_maps
, rcu
);
2001 mutex_unlock(&xps_map_mutex
);
2005 /* remove any maps that we added */
2006 for_each_possible_cpu(cpu
) {
2007 new_map
= xmap_dereference(new_dev_maps
->cpu_map
[cpu
]);
2008 map
= dev_maps
? xmap_dereference(dev_maps
->cpu_map
[cpu
]) :
2010 if (new_map
&& new_map
!= map
)
2014 mutex_unlock(&xps_map_mutex
);
2016 kfree(new_dev_maps
);
2019 EXPORT_SYMBOL(netif_set_xps_queue
);
2023 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2024 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2026 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
2030 if (txq
< 1 || txq
> dev
->num_tx_queues
)
2033 if (dev
->reg_state
== NETREG_REGISTERED
||
2034 dev
->reg_state
== NETREG_UNREGISTERING
) {
2037 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
2043 netif_setup_tc(dev
, txq
);
2045 if (txq
< dev
->real_num_tx_queues
) {
2046 qdisc_reset_all_tx_gt(dev
, txq
);
2048 netif_reset_xps_queues_gt(dev
, txq
);
2053 dev
->real_num_tx_queues
= txq
;
2056 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
2060 * netif_set_real_num_rx_queues - set actual number of RX queues used
2061 * @dev: Network device
2062 * @rxq: Actual number of RX queues
2064 * This must be called either with the rtnl_lock held or before
2065 * registration of the net device. Returns 0 on success, or a
2066 * negative error code. If called before registration, it always
2069 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
2073 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
2076 if (dev
->reg_state
== NETREG_REGISTERED
) {
2079 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
2085 dev
->real_num_rx_queues
= rxq
;
2088 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
2092 * netif_get_num_default_rss_queues - default number of RSS queues
2094 * This routine should set an upper limit on the number of RSS queues
2095 * used by default by multiqueue devices.
2097 int netif_get_num_default_rss_queues(void)
2099 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
2101 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
2103 static inline void __netif_reschedule(struct Qdisc
*q
)
2105 struct softnet_data
*sd
;
2106 unsigned long flags
;
2108 local_irq_save(flags
);
2109 sd
= &__get_cpu_var(softnet_data
);
2110 q
->next_sched
= NULL
;
2111 *sd
->output_queue_tailp
= q
;
2112 sd
->output_queue_tailp
= &q
->next_sched
;
2113 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2114 local_irq_restore(flags
);
2117 void __netif_schedule(struct Qdisc
*q
)
2119 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
2120 __netif_reschedule(q
);
2122 EXPORT_SYMBOL(__netif_schedule
);
2124 void dev_kfree_skb_irq(struct sk_buff
*skb
)
2126 if (atomic_dec_and_test(&skb
->users
)) {
2127 struct softnet_data
*sd
;
2128 unsigned long flags
;
2130 local_irq_save(flags
);
2131 sd
= &__get_cpu_var(softnet_data
);
2132 skb
->next
= sd
->completion_queue
;
2133 sd
->completion_queue
= skb
;
2134 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
2135 local_irq_restore(flags
);
2138 EXPORT_SYMBOL(dev_kfree_skb_irq
);
2140 void dev_kfree_skb_any(struct sk_buff
*skb
)
2142 if (in_irq() || irqs_disabled())
2143 dev_kfree_skb_irq(skb
);
2147 EXPORT_SYMBOL(dev_kfree_skb_any
);
2151 * netif_device_detach - mark device as removed
2152 * @dev: network device
2154 * Mark device as removed from system and therefore no longer available.
2156 void netif_device_detach(struct net_device
*dev
)
2158 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2159 netif_running(dev
)) {
2160 netif_tx_stop_all_queues(dev
);
2163 EXPORT_SYMBOL(netif_device_detach
);
2166 * netif_device_attach - mark device as attached
2167 * @dev: network device
2169 * Mark device as attached from system and restart if needed.
2171 void netif_device_attach(struct net_device
*dev
)
2173 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
2174 netif_running(dev
)) {
2175 netif_tx_wake_all_queues(dev
);
2176 __netdev_watchdog_up(dev
);
2179 EXPORT_SYMBOL(netif_device_attach
);
2181 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
2183 static const netdev_features_t null_features
= 0;
2184 struct net_device
*dev
= skb
->dev
;
2185 const char *driver
= "";
2187 if (!net_ratelimit())
2190 if (dev
&& dev
->dev
.parent
)
2191 driver
= dev_driver_string(dev
->dev
.parent
);
2193 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2194 "gso_type=%d ip_summed=%d\n",
2195 driver
, dev
? &dev
->features
: &null_features
,
2196 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
2197 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
2198 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
2202 * Invalidate hardware checksum when packet is to be mangled, and
2203 * complete checksum manually on outgoing path.
2205 int skb_checksum_help(struct sk_buff
*skb
)
2208 int ret
= 0, offset
;
2210 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
2211 goto out_set_summed
;
2213 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
2214 skb_warn_bad_offload(skb
);
2218 /* Before computing a checksum, we should make sure no frag could
2219 * be modified by an external entity : checksum could be wrong.
2221 if (skb_has_shared_frag(skb
)) {
2222 ret
= __skb_linearize(skb
);
2227 offset
= skb_checksum_start_offset(skb
);
2228 BUG_ON(offset
>= skb_headlen(skb
));
2229 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
2231 offset
+= skb
->csum_offset
;
2232 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
2234 if (skb_cloned(skb
) &&
2235 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
2236 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
2241 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
2243 skb
->ip_summed
= CHECKSUM_NONE
;
2247 EXPORT_SYMBOL(skb_checksum_help
);
2249 __be16
skb_network_protocol(struct sk_buff
*skb
)
2251 __be16 type
= skb
->protocol
;
2252 int vlan_depth
= ETH_HLEN
;
2254 /* Tunnel gso handlers can set protocol to ethernet. */
2255 if (type
== htons(ETH_P_TEB
)) {
2258 if (unlikely(!pskb_may_pull(skb
, sizeof(struct ethhdr
))))
2261 eth
= (struct ethhdr
*)skb_mac_header(skb
);
2262 type
= eth
->h_proto
;
2265 while (type
== htons(ETH_P_8021Q
) || type
== htons(ETH_P_8021AD
)) {
2266 struct vlan_hdr
*vh
;
2268 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
2271 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2272 type
= vh
->h_vlan_encapsulated_proto
;
2273 vlan_depth
+= VLAN_HLEN
;
2280 * skb_mac_gso_segment - mac layer segmentation handler.
2281 * @skb: buffer to segment
2282 * @features: features for the output path (see dev->features)
2284 struct sk_buff
*skb_mac_gso_segment(struct sk_buff
*skb
,
2285 netdev_features_t features
)
2287 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
2288 struct packet_offload
*ptype
;
2289 __be16 type
= skb_network_protocol(skb
);
2291 if (unlikely(!type
))
2292 return ERR_PTR(-EINVAL
);
2294 __skb_pull(skb
, skb
->mac_len
);
2297 list_for_each_entry_rcu(ptype
, &offload_base
, list
) {
2298 if (ptype
->type
== type
&& ptype
->callbacks
.gso_segment
) {
2299 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2302 err
= ptype
->callbacks
.gso_send_check(skb
);
2303 segs
= ERR_PTR(err
);
2304 if (err
|| skb_gso_ok(skb
, features
))
2306 __skb_push(skb
, (skb
->data
-
2307 skb_network_header(skb
)));
2309 segs
= ptype
->callbacks
.gso_segment(skb
, features
);
2315 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2319 EXPORT_SYMBOL(skb_mac_gso_segment
);
2322 /* openvswitch calls this on rx path, so we need a different check.
2324 static inline bool skb_needs_check(struct sk_buff
*skb
, bool tx_path
)
2327 return skb
->ip_summed
!= CHECKSUM_PARTIAL
;
2329 return skb
->ip_summed
== CHECKSUM_NONE
;
2333 * __skb_gso_segment - Perform segmentation on skb.
2334 * @skb: buffer to segment
2335 * @features: features for the output path (see dev->features)
2336 * @tx_path: whether it is called in TX path
2338 * This function segments the given skb and returns a list of segments.
2340 * It may return NULL if the skb requires no segmentation. This is
2341 * only possible when GSO is used for verifying header integrity.
2343 struct sk_buff
*__skb_gso_segment(struct sk_buff
*skb
,
2344 netdev_features_t features
, bool tx_path
)
2346 if (unlikely(skb_needs_check(skb
, tx_path
))) {
2349 skb_warn_bad_offload(skb
);
2351 if (skb_header_cloned(skb
) &&
2352 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2353 return ERR_PTR(err
);
2356 SKB_GSO_CB(skb
)->mac_offset
= skb_headroom(skb
);
2357 skb_reset_mac_header(skb
);
2358 skb_reset_mac_len(skb
);
2360 return skb_mac_gso_segment(skb
, features
);
2362 EXPORT_SYMBOL(__skb_gso_segment
);
2364 /* Take action when hardware reception checksum errors are detected. */
2366 void netdev_rx_csum_fault(struct net_device
*dev
)
2368 if (net_ratelimit()) {
2369 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2373 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2376 /* Actually, we should eliminate this check as soon as we know, that:
2377 * 1. IOMMU is present and allows to map all the memory.
2378 * 2. No high memory really exists on this machine.
2381 static int illegal_highdma(const struct net_device
*dev
, struct sk_buff
*skb
)
2383 #ifdef CONFIG_HIGHMEM
2385 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2386 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2387 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2388 if (PageHighMem(skb_frag_page(frag
)))
2393 if (PCI_DMA_BUS_IS_PHYS
) {
2394 struct device
*pdev
= dev
->dev
.parent
;
2398 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2399 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2400 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2401 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2410 void (*destructor
)(struct sk_buff
*skb
);
2413 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2415 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2417 struct dev_gso_cb
*cb
;
2420 struct sk_buff
*nskb
= skb
->next
;
2422 skb
->next
= nskb
->next
;
2425 } while (skb
->next
);
2427 cb
= DEV_GSO_CB(skb
);
2429 cb
->destructor(skb
);
2433 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2434 * @skb: buffer to segment
2435 * @features: device features as applicable to this skb
2437 * This function segments the given skb and stores the list of segments
2440 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2442 struct sk_buff
*segs
;
2444 segs
= skb_gso_segment(skb
, features
);
2446 /* Verifying header integrity only. */
2451 return PTR_ERR(segs
);
2454 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2455 skb
->destructor
= dev_gso_skb_destructor
;
2460 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2462 const struct net_device
*dev
,
2463 netdev_features_t features
)
2465 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2466 !can_checksum_protocol(features
, protocol
)) {
2467 features
&= ~NETIF_F_ALL_CSUM
;
2468 } else if (illegal_highdma(dev
, skb
)) {
2469 features
&= ~NETIF_F_SG
;
2475 netdev_features_t
netif_skb_dev_features(struct sk_buff
*skb
,
2476 const struct net_device
*dev
)
2478 __be16 protocol
= skb
->protocol
;
2479 netdev_features_t features
= dev
->features
;
2481 if (skb_shinfo(skb
)->gso_segs
> dev
->gso_max_segs
)
2482 features
&= ~NETIF_F_GSO_MASK
;
2484 if (protocol
== htons(ETH_P_8021Q
) || protocol
== htons(ETH_P_8021AD
)) {
2485 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2486 protocol
= veh
->h_vlan_encapsulated_proto
;
2487 } else if (!vlan_tx_tag_present(skb
)) {
2488 return harmonize_features(skb
, protocol
, dev
, features
);
2491 features
&= (dev
->vlan_features
| NETIF_F_HW_VLAN_CTAG_TX
|
2492 NETIF_F_HW_VLAN_STAG_TX
);
2494 if (protocol
!= htons(ETH_P_8021Q
) && protocol
!= htons(ETH_P_8021AD
)) {
2495 return harmonize_features(skb
, protocol
, dev
, features
);
2497 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2498 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_CTAG_TX
|
2499 NETIF_F_HW_VLAN_STAG_TX
;
2500 return harmonize_features(skb
, protocol
, dev
, features
);
2503 return harmonize_features(skb
, protocol
, dev
, features
);
2505 EXPORT_SYMBOL(netif_skb_dev_features
);
2508 * Returns true if either:
2509 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2510 * 2. skb is fragmented and the device does not support SG.
2512 static inline int skb_needs_linearize(struct sk_buff
*skb
,
2513 netdev_features_t features
)
2515 return skb_is_nonlinear(skb
) &&
2516 ((skb_has_frag_list(skb
) &&
2517 !(features
& NETIF_F_FRAGLIST
)) ||
2518 (skb_shinfo(skb
)->nr_frags
&&
2519 !(features
& NETIF_F_SG
)));
2522 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2523 struct netdev_queue
*txq
)
2525 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2526 int rc
= NETDEV_TX_OK
;
2527 unsigned int skb_len
;
2529 if (likely(!skb
->next
)) {
2530 netdev_features_t features
;
2533 * If device doesn't need skb->dst, release it right now while
2534 * its hot in this cpu cache
2536 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2539 features
= netif_skb_features(skb
);
2541 if (vlan_tx_tag_present(skb
) &&
2542 !vlan_hw_offload_capable(features
, skb
->vlan_proto
)) {
2543 skb
= __vlan_put_tag(skb
, skb
->vlan_proto
,
2544 vlan_tx_tag_get(skb
));
2551 /* If encapsulation offload request, verify we are testing
2552 * hardware encapsulation features instead of standard
2553 * features for the netdev
2555 if (skb
->encapsulation
)
2556 features
&= dev
->hw_enc_features
;
2558 if (netif_needs_gso(skb
, features
)) {
2559 if (unlikely(dev_gso_segment(skb
, features
)))
2564 if (skb_needs_linearize(skb
, features
) &&
2565 __skb_linearize(skb
))
2568 /* If packet is not checksummed and device does not
2569 * support checksumming for this protocol, complete
2570 * checksumming here.
2572 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2573 if (skb
->encapsulation
)
2574 skb_set_inner_transport_header(skb
,
2575 skb_checksum_start_offset(skb
));
2577 skb_set_transport_header(skb
,
2578 skb_checksum_start_offset(skb
));
2579 if (!(features
& NETIF_F_ALL_CSUM
) &&
2580 skb_checksum_help(skb
))
2585 if (!list_empty(&ptype_all
))
2586 dev_queue_xmit_nit(skb
, dev
);
2589 rc
= ops
->ndo_start_xmit(skb
, dev
);
2590 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2591 if (rc
== NETDEV_TX_OK
)
2592 txq_trans_update(txq
);
2598 struct sk_buff
*nskb
= skb
->next
;
2600 skb
->next
= nskb
->next
;
2603 if (!list_empty(&ptype_all
))
2604 dev_queue_xmit_nit(nskb
, dev
);
2606 skb_len
= nskb
->len
;
2607 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2608 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2609 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2610 if (rc
& ~NETDEV_TX_MASK
)
2611 goto out_kfree_gso_skb
;
2612 nskb
->next
= skb
->next
;
2616 txq_trans_update(txq
);
2617 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2618 return NETDEV_TX_BUSY
;
2619 } while (skb
->next
);
2622 if (likely(skb
->next
== NULL
)) {
2623 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2633 static void qdisc_pkt_len_init(struct sk_buff
*skb
)
2635 const struct skb_shared_info
*shinfo
= skb_shinfo(skb
);
2637 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2639 /* To get more precise estimation of bytes sent on wire,
2640 * we add to pkt_len the headers size of all segments
2642 if (shinfo
->gso_size
) {
2643 unsigned int hdr_len
;
2644 u16 gso_segs
= shinfo
->gso_segs
;
2646 /* mac layer + network layer */
2647 hdr_len
= skb_transport_header(skb
) - skb_mac_header(skb
);
2649 /* + transport layer */
2650 if (likely(shinfo
->gso_type
& (SKB_GSO_TCPV4
| SKB_GSO_TCPV6
)))
2651 hdr_len
+= tcp_hdrlen(skb
);
2653 hdr_len
+= sizeof(struct udphdr
);
2655 if (shinfo
->gso_type
& SKB_GSO_DODGY
)
2656 gso_segs
= DIV_ROUND_UP(skb
->len
- hdr_len
,
2659 qdisc_skb_cb(skb
)->pkt_len
+= (gso_segs
- 1) * hdr_len
;
2663 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2664 struct net_device
*dev
,
2665 struct netdev_queue
*txq
)
2667 spinlock_t
*root_lock
= qdisc_lock(q
);
2671 qdisc_pkt_len_init(skb
);
2672 qdisc_calculate_pkt_len(skb
, q
);
2674 * Heuristic to force contended enqueues to serialize on a
2675 * separate lock before trying to get qdisc main lock.
2676 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2677 * and dequeue packets faster.
2679 contended
= qdisc_is_running(q
);
2680 if (unlikely(contended
))
2681 spin_lock(&q
->busylock
);
2683 spin_lock(root_lock
);
2684 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2685 printk(KERN_WARNING
"[mtk_net]__dev_xmit_skb drop skb_len = %d \n", skb
->len
);
2688 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2689 qdisc_run_begin(q
)) {
2691 * This is a work-conserving queue; there are no old skbs
2692 * waiting to be sent out; and the qdisc is not running -
2693 * xmit the skb directly.
2695 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2698 qdisc_bstats_update(q
, skb
);
2700 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2701 if (unlikely(contended
)) {
2702 spin_unlock(&q
->busylock
);
2709 rc
= NET_XMIT_SUCCESS
;
2712 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2713 if (qdisc_run_begin(q
)) {
2714 if (unlikely(contended
)) {
2715 spin_unlock(&q
->busylock
);
2721 spin_unlock(root_lock
);
2722 if (unlikely(contended
))
2723 spin_unlock(&q
->busylock
);
2727 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2728 static void skb_update_prio(struct sk_buff
*skb
)
2730 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2732 if (!skb
->priority
&& skb
->sk
&& map
) {
2733 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2735 if (prioidx
< map
->priomap_len
)
2736 skb
->priority
= map
->priomap
[prioidx
];
2740 #define skb_update_prio(skb)
2743 static DEFINE_PER_CPU(int, xmit_recursion
);
2744 #define RECURSION_LIMIT 10
2747 * dev_loopback_xmit - loop back @skb
2748 * @skb: buffer to transmit
2750 int dev_loopback_xmit(struct sk_buff
*skb
)
2752 skb_reset_mac_header(skb
);
2753 __skb_pull(skb
, skb_network_offset(skb
));
2754 skb
->pkt_type
= PACKET_LOOPBACK
;
2755 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2756 WARN_ON(!skb_dst(skb
));
2761 EXPORT_SYMBOL(dev_loopback_xmit
);
2764 * dev_queue_xmit - transmit a buffer
2765 * @skb: buffer to transmit
2767 * Queue a buffer for transmission to a network device. The caller must
2768 * have set the device and priority and built the buffer before calling
2769 * this function. The function can be called from an interrupt.
2771 * A negative errno code is returned on a failure. A success does not
2772 * guarantee the frame will be transmitted as it may be dropped due
2773 * to congestion or traffic shaping.
2775 * -----------------------------------------------------------------------------------
2776 * I notice this method can also return errors from the queue disciplines,
2777 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2780 * Regardless of the return value, the skb is consumed, so it is currently
2781 * difficult to retry a send to this method. (You can bump the ref count
2782 * before sending to hold a reference for retry if you are careful.)
2784 * When calling this method, interrupts MUST be enabled. This is because
2785 * the BH enable code must have IRQs enabled so that it will not deadlock.
2788 int dev_queue_xmit(struct sk_buff
*skb
)
2790 struct net_device
*dev
= skb
->dev
;
2791 struct netdev_queue
*txq
;
2795 skb_reset_mac_header(skb
);
2799 if (unlikely((sysctl_met_is_enable
== 1) && (sysctl_udp_met_port
> 0)
2800 && (ip_hdr(skb
)->protocol
== IPPROTO_UDP
) && skb
->sk
)) {
2802 if (sysctl_udp_met_port
== ntohs((inet_sk(skb
->sk
))->inet_sport
)) {
2803 struct udphdr
* udp_iphdr
= udp_hdr(skb
);
2804 if (udp_iphdr
&& (ntohs(udp_iphdr
->len
) >= 12)) {
2805 __u16
* seq_id
= (__u16
*)((char *)udp_iphdr
+ 10);
2806 udp_event_trace_printk("F|%d|%s|%d\n", current
->pid
, *seq_id
);
2813 /* Disable soft irqs for various locks below. Also
2814 * stops preemption for RCU.
2818 skb_update_prio(skb
);
2820 txq
= netdev_pick_tx(dev
, skb
);
2821 q
= rcu_dereference_bh(txq
->qdisc
);
2823 #ifdef CONFIG_NET_CLS_ACT
2824 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2826 trace_net_dev_queue(skb
);
2828 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2832 /* The device has no queue. Common case for software devices:
2833 loopback, all the sorts of tunnels...
2835 Really, it is unlikely that netif_tx_lock protection is necessary
2836 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2838 However, it is possible, that they rely on protection
2841 Check this and shot the lock. It is not prone from deadlocks.
2842 Either shot noqueue qdisc, it is even simpler 8)
2844 if (dev
->flags
& IFF_UP
) {
2845 int cpu
= smp_processor_id(); /* ok because BHs are off */
2847 if (txq
->xmit_lock_owner
!= cpu
) {
2849 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2850 goto recursion_alert
;
2852 HARD_TX_LOCK(dev
, txq
, cpu
);
2854 if (!netif_xmit_stopped(txq
)) {
2855 __this_cpu_inc(xmit_recursion
);
2856 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2857 __this_cpu_dec(xmit_recursion
);
2858 if (dev_xmit_complete(rc
)) {
2859 HARD_TX_UNLOCK(dev
, txq
);
2863 HARD_TX_UNLOCK(dev
, txq
);
2864 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2867 /* Recursion is detected! It is possible,
2871 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2877 rcu_read_unlock_bh();
2882 rcu_read_unlock_bh();
2885 EXPORT_SYMBOL(dev_queue_xmit
);
2888 /*=======================================================================
2890 =======================================================================*/
2892 int netdev_max_backlog __read_mostly
= 1000;
2893 EXPORT_SYMBOL(netdev_max_backlog
);
2895 int netdev_tstamp_prequeue __read_mostly
= 1;
2896 int netdev_budget __read_mostly
= 300;
2897 int weight_p __read_mostly
= 64; /* old backlog weight */
2899 /* Called with irq disabled */
2900 static inline void ____napi_schedule(struct softnet_data
*sd
,
2901 struct napi_struct
*napi
)
2903 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2904 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2909 /* One global table that all flow-based protocols share. */
2910 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2911 EXPORT_SYMBOL(rps_sock_flow_table
);
2913 struct static_key rps_needed __read_mostly
;
2915 static struct rps_dev_flow
*
2916 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2917 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2919 if (next_cpu
!= RPS_NO_CPU
) {
2920 #ifdef CONFIG_RFS_ACCEL
2921 struct netdev_rx_queue
*rxqueue
;
2922 struct rps_dev_flow_table
*flow_table
;
2923 struct rps_dev_flow
*old_rflow
;
2928 /* Should we steer this flow to a different hardware queue? */
2929 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2930 !(dev
->features
& NETIF_F_NTUPLE
))
2932 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2933 if (rxq_index
== skb_get_rx_queue(skb
))
2936 rxqueue
= dev
->_rx
+ rxq_index
;
2937 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2940 flow_id
= skb
->rxhash
& flow_table
->mask
;
2941 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2942 rxq_index
, flow_id
);
2946 rflow
= &flow_table
->flows
[flow_id
];
2948 if (old_rflow
->filter
== rflow
->filter
)
2949 old_rflow
->filter
= RPS_NO_FILTER
;
2953 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2956 rflow
->cpu
= next_cpu
;
2961 * get_rps_cpu is called from netif_receive_skb and returns the target
2962 * CPU from the RPS map of the receiving queue for a given skb.
2963 * rcu_read_lock must be held on entry.
2965 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2966 struct rps_dev_flow
**rflowp
)
2968 struct netdev_rx_queue
*rxqueue
;
2969 struct rps_map
*map
;
2970 struct rps_dev_flow_table
*flow_table
;
2971 struct rps_sock_flow_table
*sock_flow_table
;
2975 if (skb_rx_queue_recorded(skb
)) {
2976 u16 index
= skb_get_rx_queue(skb
);
2977 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2978 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2979 "%s received packet on queue %u, but number "
2980 "of RX queues is %u\n",
2981 dev
->name
, index
, dev
->real_num_rx_queues
);
2984 rxqueue
= dev
->_rx
+ index
;
2988 map
= rcu_dereference(rxqueue
->rps_map
);
2990 if (map
->len
== 1 &&
2991 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2992 tcpu
= map
->cpus
[0];
2993 if (cpu_online(tcpu
))
2997 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
3001 skb_reset_network_header(skb
);
3002 if (!skb_get_rxhash(skb
))
3005 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3006 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
3007 if (flow_table
&& sock_flow_table
) {
3009 struct rps_dev_flow
*rflow
;
3011 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
3014 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
3015 sock_flow_table
->mask
];
3018 * If the desired CPU (where last recvmsg was done) is
3019 * different from current CPU (one in the rx-queue flow
3020 * table entry), switch if one of the following holds:
3021 * - Current CPU is unset (equal to RPS_NO_CPU).
3022 * - Current CPU is offline.
3023 * - The current CPU's queue tail has advanced beyond the
3024 * last packet that was enqueued using this table entry.
3025 * This guarantees that all previous packets for the flow
3026 * have been dequeued, thus preserving in order delivery.
3028 if (unlikely(tcpu
!= next_cpu
) &&
3029 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
3030 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
3031 rflow
->last_qtail
)) >= 0)) {
3033 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
3036 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
3044 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
3046 if (cpu_online(tcpu
)) {
3056 #ifdef CONFIG_RFS_ACCEL
3059 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3060 * @dev: Device on which the filter was set
3061 * @rxq_index: RX queue index
3062 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3063 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3065 * Drivers that implement ndo_rx_flow_steer() should periodically call
3066 * this function for each installed filter and remove the filters for
3067 * which it returns %true.
3069 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
3070 u32 flow_id
, u16 filter_id
)
3072 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
3073 struct rps_dev_flow_table
*flow_table
;
3074 struct rps_dev_flow
*rflow
;
3079 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
3080 if (flow_table
&& flow_id
<= flow_table
->mask
) {
3081 rflow
= &flow_table
->flows
[flow_id
];
3082 cpu
= ACCESS_ONCE(rflow
->cpu
);
3083 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
3084 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
3085 rflow
->last_qtail
) <
3086 (int)(10 * flow_table
->mask
)))
3092 EXPORT_SYMBOL(rps_may_expire_flow
);
3094 #endif /* CONFIG_RFS_ACCEL */
3096 /* Called from hardirq (IPI) context */
3097 static void rps_trigger_softirq(void *data
)
3099 struct softnet_data
*sd
= data
;
3101 ____napi_schedule(sd
, &sd
->backlog
);
3105 #endif /* CONFIG_RPS */
3108 * Check if this softnet_data structure is another cpu one
3109 * If yes, queue it to our IPI list and return 1
3112 static int rps_ipi_queued(struct softnet_data
*sd
)
3115 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
3118 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
3119 mysd
->rps_ipi_list
= sd
;
3121 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3124 #endif /* CONFIG_RPS */
3129 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3130 * queue (may be a remote CPU queue).
3132 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
3133 unsigned int *qtail
)
3135 struct softnet_data
*sd
;
3136 unsigned long flags
;
3138 sd
= &per_cpu(softnet_data
, cpu
);
3140 local_irq_save(flags
);
3143 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
3144 if (skb_queue_len(&sd
->input_pkt_queue
)) {
3146 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
3147 input_queue_tail_incr_save(sd
, qtail
);
3149 local_irq_restore(flags
);
3150 return NET_RX_SUCCESS
;
3153 /* Schedule NAPI for backlog device
3154 * We can use non atomic operation since we own the queue lock
3156 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
3157 if (!rps_ipi_queued(sd
))
3158 ____napi_schedule(sd
, &sd
->backlog
);
3166 local_irq_restore(flags
);
3168 atomic_long_inc(&skb
->dev
->rx_dropped
);
3174 * netif_rx - post buffer to the network code
3175 * @skb: buffer to post
3177 * This function receives a packet from a device driver and queues it for
3178 * the upper (protocol) levels to process. It always succeeds. The buffer
3179 * may be dropped during processing for congestion control or by the
3183 * NET_RX_SUCCESS (no congestion)
3184 * NET_RX_DROP (packet was dropped)
3188 int netif_rx(struct sk_buff
*skb
)
3192 /* if netpoll wants it, pretend we never saw it */
3193 if (netpoll_rx(skb
))
3196 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3198 trace_netif_rx(skb
);
3200 if (static_key_false(&rps_needed
)) {
3201 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3207 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3209 cpu
= smp_processor_id();
3211 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3219 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3224 EXPORT_SYMBOL(netif_rx
);
3226 int netif_rx_ni(struct sk_buff
*skb
)
3231 err
= netif_rx(skb
);
3232 if (local_softirq_pending())
3238 EXPORT_SYMBOL(netif_rx_ni
);
3240 static void net_tx_action(struct softirq_action
*h
)
3242 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3244 if (sd
->completion_queue
) {
3245 struct sk_buff
*clist
;
3247 local_irq_disable();
3248 clist
= sd
->completion_queue
;
3249 sd
->completion_queue
= NULL
;
3253 struct sk_buff
*skb
= clist
;
3254 clist
= clist
->next
;
3256 WARN_ON(atomic_read(&skb
->users
));
3257 trace_kfree_skb(skb
, net_tx_action
);
3262 if (sd
->output_queue
) {
3265 local_irq_disable();
3266 head
= sd
->output_queue
;
3267 sd
->output_queue
= NULL
;
3268 sd
->output_queue_tailp
= &sd
->output_queue
;
3272 struct Qdisc
*q
= head
;
3273 spinlock_t
*root_lock
;
3275 head
= head
->next_sched
;
3277 root_lock
= qdisc_lock(q
);
3278 if (spin_trylock(root_lock
)) {
3279 smp_mb__before_clear_bit();
3280 clear_bit(__QDISC_STATE_SCHED
,
3283 spin_unlock(root_lock
);
3285 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3287 __netif_reschedule(q
);
3289 smp_mb__before_clear_bit();
3290 clear_bit(__QDISC_STATE_SCHED
,
3298 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3299 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3300 /* This hook is defined here for ATM LANE */
3301 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3302 unsigned char *addr
) __read_mostly
;
3303 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3306 #ifdef CONFIG_NET_CLS_ACT
3307 /* TODO: Maybe we should just force sch_ingress to be compiled in
3308 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3309 * a compare and 2 stores extra right now if we dont have it on
3310 * but have CONFIG_NET_CLS_ACT
3311 * NOTE: This doesn't stop any functionality; if you dont have
3312 * the ingress scheduler, you just can't add policies on ingress.
3315 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3317 struct net_device
*dev
= skb
->dev
;
3318 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3319 int result
= TC_ACT_OK
;
3322 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3323 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3324 skb
->skb_iif
, dev
->ifindex
);
3328 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3329 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3332 if (q
!= &noop_qdisc
) {
3333 spin_lock(qdisc_lock(q
));
3334 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3335 result
= qdisc_enqueue_root(skb
, q
);
3336 spin_unlock(qdisc_lock(q
));
3342 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3343 struct packet_type
**pt_prev
,
3344 int *ret
, struct net_device
*orig_dev
)
3346 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3348 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3352 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3356 switch (ing_filter(skb
, rxq
)) {
3370 * netdev_rx_handler_register - register receive handler
3371 * @dev: device to register a handler for
3372 * @rx_handler: receive handler to register
3373 * @rx_handler_data: data pointer that is used by rx handler
3375 * Register a receive hander for a device. This handler will then be
3376 * called from __netif_receive_skb. A negative errno code is returned
3379 * The caller must hold the rtnl_mutex.
3381 * For a general description of rx_handler, see enum rx_handler_result.
3383 int netdev_rx_handler_register(struct net_device
*dev
,
3384 rx_handler_func_t
*rx_handler
,
3385 void *rx_handler_data
)
3389 if (dev
->rx_handler
)
3392 /* Note: rx_handler_data must be set before rx_handler */
3393 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3394 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3398 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3401 * netdev_rx_handler_unregister - unregister receive handler
3402 * @dev: device to unregister a handler from
3404 * Unregister a receive handler from a device.
3406 * The caller must hold the rtnl_mutex.
3408 void netdev_rx_handler_unregister(struct net_device
*dev
)
3412 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3413 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3414 * section has a guarantee to see a non NULL rx_handler_data
3418 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3420 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3423 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3424 * the special handling of PFMEMALLOC skbs.
3426 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3428 switch (skb
->protocol
) {
3429 case __constant_htons(ETH_P_ARP
):
3430 case __constant_htons(ETH_P_IP
):
3431 case __constant_htons(ETH_P_IPV6
):
3432 case __constant_htons(ETH_P_8021Q
):
3433 case __constant_htons(ETH_P_8021AD
):
3440 static int __netif_receive_skb_core(struct sk_buff
*skb
, bool pfmemalloc
)
3442 struct packet_type
*ptype
, *pt_prev
;
3443 rx_handler_func_t
*rx_handler
;
3444 struct net_device
*orig_dev
;
3445 struct net_device
*null_or_dev
;
3446 bool deliver_exact
= false;
3447 int ret
= NET_RX_DROP
;
3450 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3452 trace_netif_receive_skb(skb
);
3454 /* if we've gotten here through NAPI, check netpoll */
3455 if (netpoll_receive_skb(skb
))
3458 orig_dev
= skb
->dev
;
3460 skb_reset_network_header(skb
);
3461 if (!skb_transport_header_was_set(skb
))
3462 skb_reset_transport_header(skb
);
3463 skb_reset_mac_len(skb
);
3470 skb
->skb_iif
= skb
->dev
->ifindex
;
3472 __this_cpu_inc(softnet_data
.processed
);
3474 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
) ||
3475 skb
->protocol
== cpu_to_be16(ETH_P_8021AD
)) {
3476 skb
= vlan_untag(skb
);
3481 #ifdef CONFIG_NET_CLS_ACT
3482 if (skb
->tc_verd
& TC_NCLS
) {
3483 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3491 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3492 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3494 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3500 #ifdef CONFIG_NET_CLS_ACT
3501 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3507 if (pfmemalloc
&& !skb_pfmemalloc_protocol(skb
))
3510 if (vlan_tx_tag_present(skb
)) {
3512 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3515 if (vlan_do_receive(&skb
))
3517 else if (unlikely(!skb
))
3521 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3524 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3527 switch (rx_handler(&skb
)) {
3528 case RX_HANDLER_CONSUMED
:
3529 ret
= NET_RX_SUCCESS
;
3531 case RX_HANDLER_ANOTHER
:
3533 case RX_HANDLER_EXACT
:
3534 deliver_exact
= true;
3535 case RX_HANDLER_PASS
:
3542 if (unlikely(vlan_tx_tag_present(skb
))) {
3543 if (vlan_tx_tag_get_id(skb
))
3544 skb
->pkt_type
= PACKET_OTHERHOST
;
3545 /* Note: we might in the future use prio bits
3546 * and set skb->priority like in vlan_do_receive()
3547 * For the time being, just ignore Priority Code Point
3552 /* deliver only exact match when indicated */
3553 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3555 type
= skb
->protocol
;
3556 list_for_each_entry_rcu(ptype
,
3557 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3558 if (ptype
->type
== type
&&
3559 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3560 ptype
->dev
== orig_dev
)) {
3562 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3568 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3571 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3574 atomic_long_inc(&skb
->dev
->rx_dropped
);
3576 /* Jamal, now you will not able to escape explaining
3577 * me how you were going to use this. :-)
3588 static int __netif_receive_skb(struct sk_buff
*skb
)
3592 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)) {
3593 unsigned long pflags
= current
->flags
;
3596 * PFMEMALLOC skbs are special, they should
3597 * - be delivered to SOCK_MEMALLOC sockets only
3598 * - stay away from userspace
3599 * - have bounded memory usage
3601 * Use PF_MEMALLOC as this saves us from propagating the allocation
3602 * context down to all allocation sites.
3604 current
->flags
|= PF_MEMALLOC
;
3605 ret
= __netif_receive_skb_core(skb
, true);
3606 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3608 ret
= __netif_receive_skb_core(skb
, false);
3614 * netif_receive_skb - process receive buffer from network
3615 * @skb: buffer to process
3617 * netif_receive_skb() is the main receive data processing function.
3618 * It always succeeds. The buffer may be dropped during processing
3619 * for congestion control or by the protocol layers.
3621 * This function may only be called from softirq context and interrupts
3622 * should be enabled.
3624 * Return values (usually ignored):
3625 * NET_RX_SUCCESS: no congestion
3626 * NET_RX_DROP: packet was dropped
3628 int netif_receive_skb(struct sk_buff
*skb
)
3630 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3632 if (skb_defer_rx_timestamp(skb
))
3633 return NET_RX_SUCCESS
;
3636 if (static_key_false(&rps_needed
)) {
3637 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3642 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3645 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3652 return __netif_receive_skb(skb
);
3654 EXPORT_SYMBOL(netif_receive_skb
);
3656 /* Network device is going away, flush any packets still pending
3657 * Called with irqs disabled.
3659 static void flush_backlog(void *arg
)
3661 struct net_device
*dev
= arg
;
3662 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3663 struct sk_buff
*skb
, *tmp
;
3666 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3667 if (skb
->dev
== dev
) {
3668 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3670 input_queue_head_incr(sd
);
3675 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3676 if (skb
->dev
== dev
) {
3677 __skb_unlink(skb
, &sd
->process_queue
);
3679 input_queue_head_incr(sd
);
3684 static int napi_gro_complete(struct sk_buff
*skb
)
3686 struct packet_offload
*ptype
;
3687 __be16 type
= skb
->protocol
;
3688 struct list_head
*head
= &offload_base
;
3691 BUILD_BUG_ON(sizeof(struct napi_gro_cb
) > sizeof(skb
->cb
));
3693 if (NAPI_GRO_CB(skb
)->count
== 1) {
3694 skb_shinfo(skb
)->gso_size
= 0;
3699 list_for_each_entry_rcu(ptype
, head
, list
) {
3700 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_complete
)
3703 err
= ptype
->callbacks
.gro_complete(skb
);
3709 WARN_ON(&ptype
->list
== head
);
3711 return NET_RX_SUCCESS
;
3715 return netif_receive_skb(skb
);
3718 /* napi->gro_list contains packets ordered by age.
3719 * youngest packets at the head of it.
3720 * Complete skbs in reverse order to reduce latencies.
3722 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3724 struct sk_buff
*skb
, *prev
= NULL
;
3726 /* scan list and build reverse chain */
3727 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3732 for (skb
= prev
; skb
; skb
= prev
) {
3735 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3739 napi_gro_complete(skb
);
3743 napi
->gro_list
= NULL
;
3745 EXPORT_SYMBOL(napi_gro_flush
);
3747 static void gro_list_prepare(struct napi_struct
*napi
, struct sk_buff
*skb
)
3750 unsigned int maclen
= skb
->dev
->hard_header_len
;
3752 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3753 unsigned long diffs
;
3755 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3756 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3757 if (maclen
== ETH_HLEN
)
3758 diffs
|= compare_ether_header(skb_mac_header(p
),
3759 skb_gro_mac_header(skb
));
3761 diffs
= memcmp(skb_mac_header(p
),
3762 skb_gro_mac_header(skb
),
3764 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3765 NAPI_GRO_CB(p
)->flush
= 0;
3769 static enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3771 struct sk_buff
**pp
= NULL
;
3772 struct packet_offload
*ptype
;
3773 __be16 type
= skb
->protocol
;
3774 struct list_head
*head
= &offload_base
;
3776 enum gro_result ret
;
3778 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3781 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3784 gro_list_prepare(napi
, skb
);
3787 list_for_each_entry_rcu(ptype
, head
, list
) {
3788 if (ptype
->type
!= type
|| !ptype
->callbacks
.gro_receive
)
3791 skb_set_network_header(skb
, skb_gro_offset(skb
));
3792 skb_reset_mac_len(skb
);
3793 NAPI_GRO_CB(skb
)->same_flow
= 0;
3794 NAPI_GRO_CB(skb
)->flush
= 0;
3795 NAPI_GRO_CB(skb
)->free
= 0;
3797 pp
= ptype
->callbacks
.gro_receive(&napi
->gro_list
, skb
);
3802 if (&ptype
->list
== head
)
3805 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3806 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3809 struct sk_buff
*nskb
= *pp
;
3813 napi_gro_complete(nskb
);
3820 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3824 NAPI_GRO_CB(skb
)->count
= 1;
3825 NAPI_GRO_CB(skb
)->age
= jiffies
;
3826 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3827 skb
->next
= napi
->gro_list
;
3828 napi
->gro_list
= skb
;
3832 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3833 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3835 BUG_ON(skb
->end
- skb
->tail
< grow
);
3837 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3840 skb
->data_len
-= grow
;
3842 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3843 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3845 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3846 skb_frag_unref(skb
, 0);
3847 memmove(skb_shinfo(skb
)->frags
,
3848 skb_shinfo(skb
)->frags
+ 1,
3849 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3862 static gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3866 if (netif_receive_skb(skb
))
3874 case GRO_MERGED_FREE
:
3875 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3876 kmem_cache_free(skbuff_head_cache
, skb
);
3889 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3891 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3892 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3894 NAPI_GRO_CB(skb
)->data_offset
= 0;
3895 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3896 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3898 if (skb
->mac_header
== skb
->tail
&&
3900 !PageHighMem(skb_frag_page(frag0
))) {
3901 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3902 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3906 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3908 skb_gro_reset_offset(skb
);
3910 return napi_skb_finish(dev_gro_receive(napi
, skb
), skb
);
3912 EXPORT_SYMBOL(napi_gro_receive
);
3914 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3916 __skb_pull(skb
, skb_headlen(skb
));
3917 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3918 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3920 skb
->dev
= napi
->dev
;
3922 skb
->truesize
= SKB_TRUESIZE(skb_end_offset(skb
));
3927 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3929 struct sk_buff
*skb
= napi
->skb
;
3932 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3938 EXPORT_SYMBOL(napi_get_frags
);
3940 static gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3946 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3948 if (ret
== GRO_HELD
)
3949 skb_gro_pull(skb
, -ETH_HLEN
);
3950 else if (netif_receive_skb(skb
))
3955 case GRO_MERGED_FREE
:
3956 napi_reuse_skb(napi
, skb
);
3966 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3968 struct sk_buff
*skb
= napi
->skb
;
3975 skb_reset_mac_header(skb
);
3976 skb_gro_reset_offset(skb
);
3978 off
= skb_gro_offset(skb
);
3979 hlen
= off
+ sizeof(*eth
);
3980 eth
= skb_gro_header_fast(skb
, off
);
3981 if (skb_gro_header_hard(skb
, hlen
)) {
3982 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3983 if (unlikely(!eth
)) {
3984 napi_reuse_skb(napi
, skb
);
3990 skb_gro_pull(skb
, sizeof(*eth
));
3993 * This works because the only protocols we care about don't require
3994 * special handling. We'll fix it up properly at the end.
3996 skb
->protocol
= eth
->h_proto
;
4002 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
4004 struct sk_buff
*skb
= napi_frags_skb(napi
);
4009 return napi_frags_finish(napi
, skb
, dev_gro_receive(napi
, skb
));
4011 EXPORT_SYMBOL(napi_gro_frags
);
4014 * net_rps_action sends any pending IPI's for rps.
4015 * Note: called with local irq disabled, but exits with local irq enabled.
4017 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
4020 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
4023 sd
->rps_ipi_list
= NULL
;
4027 /* Send pending IPI's to kick RPS processing on remote cpus. */
4029 struct softnet_data
*next
= remsd
->rps_ipi_next
;
4031 if (cpu_online(remsd
->cpu
))
4032 __smp_call_function_single(remsd
->cpu
,
4041 static int process_backlog(struct napi_struct
*napi
, int quota
)
4044 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
4047 /* Check if we have pending ipi, its better to send them now,
4048 * not waiting net_rx_action() end.
4050 if (sd
->rps_ipi_list
) {
4051 local_irq_disable();
4052 net_rps_action_and_irq_enable(sd
);
4055 napi
->weight
= weight_p
;
4056 local_irq_disable();
4057 while (work
< quota
) {
4058 struct sk_buff
*skb
;
4061 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
4063 __netif_receive_skb(skb
);
4064 local_irq_disable();
4065 input_queue_head_incr(sd
);
4066 if (++work
>= quota
) {
4073 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
4075 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
4076 &sd
->process_queue
);
4078 if (qlen
< quota
- work
) {
4080 * Inline a custom version of __napi_complete().
4081 * only current cpu owns and manipulates this napi,
4082 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
4083 * we can use a plain write instead of clear_bit(),
4084 * and we dont need an smp_mb() memory barrier.
4086 list_del(&napi
->poll_list
);
4089 quota
= work
+ qlen
;
4099 * __napi_schedule - schedule for receive
4100 * @n: entry to schedule
4102 * The entry's receive function will be scheduled to run
4104 void __napi_schedule(struct napi_struct
*n
)
4106 unsigned long flags
;
4108 local_irq_save(flags
);
4109 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
4110 local_irq_restore(flags
);
4112 EXPORT_SYMBOL(__napi_schedule
);
4114 void __napi_complete(struct napi_struct
*n
)
4116 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
4117 BUG_ON(n
->gro_list
);
4119 list_del(&n
->poll_list
);
4120 smp_mb__before_clear_bit();
4121 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
4123 EXPORT_SYMBOL(__napi_complete
);
4125 void napi_complete(struct napi_struct
*n
)
4127 unsigned long flags
;
4130 * don't let napi dequeue from the cpu poll list
4131 * just in case its running on a different cpu
4133 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
4136 napi_gro_flush(n
, false);
4137 local_irq_save(flags
);
4139 local_irq_restore(flags
);
4141 EXPORT_SYMBOL(napi_complete
);
4143 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
4144 int (*poll
)(struct napi_struct
*, int), int weight
)
4146 INIT_LIST_HEAD(&napi
->poll_list
);
4147 napi
->gro_count
= 0;
4148 napi
->gro_list
= NULL
;
4151 if (weight
> NAPI_POLL_WEIGHT
)
4152 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4154 napi
->weight
= weight
;
4155 list_add(&napi
->dev_list
, &dev
->napi_list
);
4157 #ifdef CONFIG_NETPOLL
4158 spin_lock_init(&napi
->poll_lock
);
4159 napi
->poll_owner
= -1;
4161 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
4163 EXPORT_SYMBOL(netif_napi_add
);
4165 void netif_napi_del(struct napi_struct
*napi
)
4167 struct sk_buff
*skb
, *next
;
4169 list_del_init(&napi
->dev_list
);
4170 napi_free_frags(napi
);
4172 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
4178 napi
->gro_list
= NULL
;
4179 napi
->gro_count
= 0;
4181 EXPORT_SYMBOL(netif_napi_del
);
4183 static void net_rx_action(struct softirq_action
*h
)
4185 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
4186 unsigned long time_limit
= jiffies
+ 2;
4187 int budget
= netdev_budget
;
4190 local_irq_disable();
4192 while (!list_empty(&sd
->poll_list
)) {
4193 struct napi_struct
*n
;
4196 /* If softirq window is exhuasted then punt.
4197 * Allow this to run for 2 jiffies since which will allow
4198 * an average latency of 1.5/HZ.
4200 if (unlikely(budget
<= 0 || time_after_eq(jiffies
, time_limit
)))
4205 /* Even though interrupts have been re-enabled, this
4206 * access is safe because interrupts can only add new
4207 * entries to the tail of this list, and only ->poll()
4208 * calls can remove this head entry from the list.
4210 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
4212 have
= netpoll_poll_lock(n
);
4216 /* This NAPI_STATE_SCHED test is for avoiding a race
4217 * with netpoll's poll_napi(). Only the entity which
4218 * obtains the lock and sees NAPI_STATE_SCHED set will
4219 * actually make the ->poll() call. Therefore we avoid
4220 * accidentally calling ->poll() when NAPI is not scheduled.
4223 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
4224 work
= n
->poll(n
, weight
);
4228 WARN_ON_ONCE(work
> weight
);
4232 local_irq_disable();
4234 /* Drivers must not modify the NAPI state if they
4235 * consume the entire weight. In such cases this code
4236 * still "owns" the NAPI instance and therefore can
4237 * move the instance around on the list at-will.
4239 if (unlikely(work
== weight
)) {
4240 if (unlikely(napi_disable_pending(n
))) {
4243 local_irq_disable();
4246 /* flush too old packets
4247 * If HZ < 1000, flush all packets.
4250 napi_gro_flush(n
, HZ
>= 1000);
4251 local_irq_disable();
4253 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4257 netpoll_poll_unlock(have
);
4260 net_rps_action_and_irq_enable(sd
);
4262 #ifdef CONFIG_NET_DMA
4264 * There may not be any more sk_buffs coming right now, so push
4265 * any pending DMA copies to hardware
4267 dma_issue_pending_all();
4274 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4278 struct netdev_upper
{
4279 struct net_device
*dev
;
4281 struct list_head list
;
4282 struct rcu_head rcu
;
4283 struct list_head search_list
;
4286 static void __append_search_uppers(struct list_head
*search_list
,
4287 struct net_device
*dev
)
4289 struct netdev_upper
*upper
;
4291 list_for_each_entry(upper
, &dev
->upper_dev_list
, list
) {
4292 /* check if this upper is not already in search list */
4293 if (list_empty(&upper
->search_list
))
4294 list_add_tail(&upper
->search_list
, search_list
);
4298 static bool __netdev_search_upper_dev(struct net_device
*dev
,
4299 struct net_device
*upper_dev
)
4301 LIST_HEAD(search_list
);
4302 struct netdev_upper
*upper
;
4303 struct netdev_upper
*tmp
;
4306 __append_search_uppers(&search_list
, dev
);
4307 list_for_each_entry(upper
, &search_list
, search_list
) {
4308 if (upper
->dev
== upper_dev
) {
4312 __append_search_uppers(&search_list
, upper
->dev
);
4314 list_for_each_entry_safe(upper
, tmp
, &search_list
, search_list
)
4315 INIT_LIST_HEAD(&upper
->search_list
);
4319 static struct netdev_upper
*__netdev_find_upper(struct net_device
*dev
,
4320 struct net_device
*upper_dev
)
4322 struct netdev_upper
*upper
;
4324 list_for_each_entry(upper
, &dev
->upper_dev_list
, list
) {
4325 if (upper
->dev
== upper_dev
)
4332 * netdev_has_upper_dev - Check if device is linked to an upper device
4334 * @upper_dev: upper device to check
4336 * Find out if a device is linked to specified upper device and return true
4337 * in case it is. Note that this checks only immediate upper device,
4338 * not through a complete stack of devices. The caller must hold the RTNL lock.
4340 bool netdev_has_upper_dev(struct net_device
*dev
,
4341 struct net_device
*upper_dev
)
4345 return __netdev_find_upper(dev
, upper_dev
);
4347 EXPORT_SYMBOL(netdev_has_upper_dev
);
4350 * netdev_has_any_upper_dev - Check if device is linked to some device
4353 * Find out if a device is linked to an upper device and return true in case
4354 * it is. The caller must hold the RTNL lock.
4356 bool netdev_has_any_upper_dev(struct net_device
*dev
)
4360 return !list_empty(&dev
->upper_dev_list
);
4362 EXPORT_SYMBOL(netdev_has_any_upper_dev
);
4365 * netdev_master_upper_dev_get - Get master upper device
4368 * Find a master upper device and return pointer to it or NULL in case
4369 * it's not there. The caller must hold the RTNL lock.
4371 struct net_device
*netdev_master_upper_dev_get(struct net_device
*dev
)
4373 struct netdev_upper
*upper
;
4377 if (list_empty(&dev
->upper_dev_list
))
4380 upper
= list_first_entry(&dev
->upper_dev_list
,
4381 struct netdev_upper
, list
);
4382 if (likely(upper
->master
))
4386 EXPORT_SYMBOL(netdev_master_upper_dev_get
);
4389 * netdev_master_upper_dev_get_rcu - Get master upper device
4392 * Find a master upper device and return pointer to it or NULL in case
4393 * it's not there. The caller must hold the RCU read lock.
4395 struct net_device
*netdev_master_upper_dev_get_rcu(struct net_device
*dev
)
4397 struct netdev_upper
*upper
;
4399 upper
= list_first_or_null_rcu(&dev
->upper_dev_list
,
4400 struct netdev_upper
, list
);
4401 if (upper
&& likely(upper
->master
))
4405 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu
);
4407 static int __netdev_upper_dev_link(struct net_device
*dev
,
4408 struct net_device
*upper_dev
, bool master
)
4410 struct netdev_upper
*upper
;
4414 if (dev
== upper_dev
)
4417 /* To prevent loops, check if dev is not upper device to upper_dev. */
4418 if (__netdev_search_upper_dev(upper_dev
, dev
))
4421 if (__netdev_find_upper(dev
, upper_dev
))
4424 if (master
&& netdev_master_upper_dev_get(dev
))
4427 upper
= kmalloc(sizeof(*upper
), GFP_KERNEL
);
4431 upper
->dev
= upper_dev
;
4432 upper
->master
= master
;
4433 INIT_LIST_HEAD(&upper
->search_list
);
4435 /* Ensure that master upper link is always the first item in list. */
4437 list_add_rcu(&upper
->list
, &dev
->upper_dev_list
);
4439 list_add_tail_rcu(&upper
->list
, &dev
->upper_dev_list
);
4440 dev_hold(upper_dev
);
4446 * netdev_upper_dev_link - Add a link to the upper device
4448 * @upper_dev: new upper device
4450 * Adds a link to device which is upper to this one. The caller must hold
4451 * the RTNL lock. On a failure a negative errno code is returned.
4452 * On success the reference counts are adjusted and the function
4455 int netdev_upper_dev_link(struct net_device
*dev
,
4456 struct net_device
*upper_dev
)
4458 return __netdev_upper_dev_link(dev
, upper_dev
, false);
4460 EXPORT_SYMBOL(netdev_upper_dev_link
);
4463 * netdev_master_upper_dev_link - Add a master link to the upper device
4465 * @upper_dev: new upper device
4467 * Adds a link to device which is upper to this one. In this case, only
4468 * one master upper device can be linked, although other non-master devices
4469 * might be linked as well. The caller must hold the RTNL lock.
4470 * On a failure a negative errno code is returned. On success the reference
4471 * counts are adjusted and the function returns zero.
4473 int netdev_master_upper_dev_link(struct net_device
*dev
,
4474 struct net_device
*upper_dev
)
4476 return __netdev_upper_dev_link(dev
, upper_dev
, true);
4478 EXPORT_SYMBOL(netdev_master_upper_dev_link
);
4481 * netdev_upper_dev_unlink - Removes a link to upper device
4483 * @upper_dev: new upper device
4485 * Removes a link to device which is upper to this one. The caller must hold
4488 void netdev_upper_dev_unlink(struct net_device
*dev
,
4489 struct net_device
*upper_dev
)
4491 struct netdev_upper
*upper
;
4495 upper
= __netdev_find_upper(dev
, upper_dev
);
4498 list_del_rcu(&upper
->list
);
4500 kfree_rcu(upper
, rcu
);
4502 EXPORT_SYMBOL(netdev_upper_dev_unlink
);
4504 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4506 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4508 if (ops
->ndo_change_rx_flags
)
4509 ops
->ndo_change_rx_flags(dev
, flags
);
4512 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4514 unsigned int old_flags
= dev
->flags
;
4520 dev
->flags
|= IFF_PROMISC
;
4521 dev
->promiscuity
+= inc
;
4522 if (dev
->promiscuity
== 0) {
4525 * If inc causes overflow, untouch promisc and return error.
4528 dev
->flags
&= ~IFF_PROMISC
;
4530 dev
->promiscuity
-= inc
;
4531 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4536 if (dev
->flags
!= old_flags
) {
4537 pr_info("device %s %s promiscuous mode\n",
4539 dev
->flags
& IFF_PROMISC
? "entered" : "left");
4540 if (audit_enabled
) {
4541 current_uid_gid(&uid
, &gid
);
4542 audit_log(current
->audit_context
, GFP_ATOMIC
,
4543 AUDIT_ANOM_PROMISCUOUS
,
4544 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4545 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4546 (old_flags
& IFF_PROMISC
),
4547 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
4548 from_kuid(&init_user_ns
, uid
),
4549 from_kgid(&init_user_ns
, gid
),
4550 audit_get_sessionid(current
));
4553 dev_change_rx_flags(dev
, IFF_PROMISC
);
4559 * dev_set_promiscuity - update promiscuity count on a device
4563 * Add or remove promiscuity from a device. While the count in the device
4564 * remains above zero the interface remains promiscuous. Once it hits zero
4565 * the device reverts back to normal filtering operation. A negative inc
4566 * value is used to drop promiscuity on the device.
4567 * Return 0 if successful or a negative errno code on error.
4569 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4571 unsigned int old_flags
= dev
->flags
;
4574 err
= __dev_set_promiscuity(dev
, inc
);
4577 if (dev
->flags
!= old_flags
)
4578 dev_set_rx_mode(dev
);
4581 EXPORT_SYMBOL(dev_set_promiscuity
);
4584 * dev_set_allmulti - update allmulti count on a device
4588 * Add or remove reception of all multicast frames to a device. While the
4589 * count in the device remains above zero the interface remains listening
4590 * to all interfaces. Once it hits zero the device reverts back to normal
4591 * filtering operation. A negative @inc value is used to drop the counter
4592 * when releasing a resource needing all multicasts.
4593 * Return 0 if successful or a negative errno code on error.
4596 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4598 unsigned int old_flags
= dev
->flags
;
4602 dev
->flags
|= IFF_ALLMULTI
;
4603 dev
->allmulti
+= inc
;
4604 if (dev
->allmulti
== 0) {
4607 * If inc causes overflow, untouch allmulti and return error.
4610 dev
->flags
&= ~IFF_ALLMULTI
;
4612 dev
->allmulti
-= inc
;
4613 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4618 if (dev
->flags
^ old_flags
) {
4619 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4620 dev_set_rx_mode(dev
);
4624 EXPORT_SYMBOL(dev_set_allmulti
);
4627 * Upload unicast and multicast address lists to device and
4628 * configure RX filtering. When the device doesn't support unicast
4629 * filtering it is put in promiscuous mode while unicast addresses
4632 void __dev_set_rx_mode(struct net_device
*dev
)
4634 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4636 /* dev_open will call this function so the list will stay sane. */
4637 if (!(dev
->flags
&IFF_UP
))
4640 if (!netif_device_present(dev
))
4643 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
4644 /* Unicast addresses changes may only happen under the rtnl,
4645 * therefore calling __dev_set_promiscuity here is safe.
4647 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4648 __dev_set_promiscuity(dev
, 1);
4649 dev
->uc_promisc
= true;
4650 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4651 __dev_set_promiscuity(dev
, -1);
4652 dev
->uc_promisc
= false;
4656 if (ops
->ndo_set_rx_mode
)
4657 ops
->ndo_set_rx_mode(dev
);
4659 EXPORT_SYMBOL(__dev_set_rx_mode
);
4661 void dev_set_rx_mode(struct net_device
*dev
)
4663 netif_addr_lock_bh(dev
);
4664 __dev_set_rx_mode(dev
);
4665 netif_addr_unlock_bh(dev
);
4669 * dev_get_flags - get flags reported to userspace
4672 * Get the combination of flag bits exported through APIs to userspace.
4674 unsigned int dev_get_flags(const struct net_device
*dev
)
4678 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4683 (dev
->gflags
& (IFF_PROMISC
|
4686 if (netif_running(dev
)) {
4687 if (netif_oper_up(dev
))
4688 flags
|= IFF_RUNNING
;
4689 if (netif_carrier_ok(dev
))
4690 flags
|= IFF_LOWER_UP
;
4691 if (netif_dormant(dev
))
4692 flags
|= IFF_DORMANT
;
4697 EXPORT_SYMBOL(dev_get_flags
);
4699 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4701 unsigned int old_flags
= dev
->flags
;
4707 * Set the flags on our device.
4710 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4711 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4713 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4717 * Load in the correct multicast list now the flags have changed.
4720 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4721 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4723 dev_set_rx_mode(dev
);
4726 * Have we downed the interface. We handle IFF_UP ourselves
4727 * according to user attempts to set it, rather than blindly
4732 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4733 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4736 dev_set_rx_mode(dev
);
4739 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4740 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4742 dev
->gflags
^= IFF_PROMISC
;
4743 dev_set_promiscuity(dev
, inc
);
4746 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4747 is important. Some (broken) drivers set IFF_PROMISC, when
4748 IFF_ALLMULTI is requested not asking us and not reporting.
4750 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4751 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4753 dev
->gflags
^= IFF_ALLMULTI
;
4754 dev_set_allmulti(dev
, inc
);
4760 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4762 unsigned int changes
= dev
->flags
^ old_flags
;
4764 if (changes
& IFF_UP
) {
4765 if (dev
->flags
& IFF_UP
)
4766 call_netdevice_notifiers(NETDEV_UP
, dev
);
4768 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4771 if (dev
->flags
& IFF_UP
&&
4772 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4773 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4777 * dev_change_flags - change device settings
4779 * @flags: device state flags
4781 * Change settings on device based state flags. The flags are
4782 * in the userspace exported format.
4784 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4787 unsigned int changes
, old_flags
= dev
->flags
;
4789 ret
= __dev_change_flags(dev
, flags
);
4793 changes
= old_flags
^ dev
->flags
;
4795 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4797 __dev_notify_flags(dev
, old_flags
);
4800 EXPORT_SYMBOL(dev_change_flags
);
4803 * dev_set_mtu - Change maximum transfer unit
4805 * @new_mtu: new transfer unit
4807 * Change the maximum transfer size of the network device.
4809 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4811 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4814 if (new_mtu
== dev
->mtu
)
4817 /* MTU must be positive. */
4821 if (!netif_device_present(dev
))
4825 if (ops
->ndo_change_mtu
)
4826 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4831 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4834 EXPORT_SYMBOL(dev_set_mtu
);
4837 * dev_set_group - Change group this device belongs to
4839 * @new_group: group this device should belong to
4841 void dev_set_group(struct net_device
*dev
, int new_group
)
4843 dev
->group
= new_group
;
4845 EXPORT_SYMBOL(dev_set_group
);
4848 * dev_set_mac_address - Change Media Access Control Address
4852 * Change the hardware (MAC) address of the device
4854 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4856 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4859 if (!ops
->ndo_set_mac_address
)
4861 if (sa
->sa_family
!= dev
->type
)
4863 if (!netif_device_present(dev
))
4865 err
= ops
->ndo_set_mac_address(dev
, sa
);
4868 dev
->addr_assign_type
= NET_ADDR_SET
;
4869 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4870 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
4873 EXPORT_SYMBOL(dev_set_mac_address
);
4876 * dev_change_carrier - Change device carrier
4878 * @new_carrier: new value
4880 * Change device carrier
4882 int dev_change_carrier(struct net_device
*dev
, bool new_carrier
)
4884 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4886 if (!ops
->ndo_change_carrier
)
4888 if (!netif_device_present(dev
))
4890 return ops
->ndo_change_carrier(dev
, new_carrier
);
4892 EXPORT_SYMBOL(dev_change_carrier
);
4895 * dev_new_index - allocate an ifindex
4896 * @net: the applicable net namespace
4898 * Returns a suitable unique value for a new device interface
4899 * number. The caller must hold the rtnl semaphore or the
4900 * dev_base_lock to be sure it remains unique.
4902 static int dev_new_index(struct net
*net
)
4904 int ifindex
= net
->ifindex
;
4908 if (!__dev_get_by_index(net
, ifindex
))
4909 return net
->ifindex
= ifindex
;
4913 /* Delayed registration/unregisteration */
4914 static LIST_HEAD(net_todo_list
);
4916 static void net_set_todo(struct net_device
*dev
)
4918 list_add_tail(&dev
->todo_list
, &net_todo_list
);
4921 static void rollback_registered_many(struct list_head
*head
)
4923 struct net_device
*dev
, *tmp
;
4925 BUG_ON(dev_boot_phase
);
4928 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
4929 /* Some devices call without registering
4930 * for initialization unwind. Remove those
4931 * devices and proceed with the remaining.
4933 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
4934 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
4938 list_del(&dev
->unreg_list
);
4941 dev
->dismantle
= true;
4942 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
4945 /* If device is running, close it first. */
4946 dev_close_many(head
);
4948 list_for_each_entry(dev
, head
, unreg_list
) {
4949 /* And unlink it from device chain. */
4950 unlist_netdevice(dev
);
4952 dev
->reg_state
= NETREG_UNREGISTERING
;
4957 list_for_each_entry(dev
, head
, unreg_list
) {
4958 /* Shutdown queueing discipline. */
4962 /* Notify protocols, that we are about to destroy
4963 this device. They should clean all the things.
4965 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
4967 if (!dev
->rtnl_link_ops
||
4968 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
4969 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
4972 * Flush the unicast and multicast chains
4977 if (dev
->netdev_ops
->ndo_uninit
)
4978 dev
->netdev_ops
->ndo_uninit(dev
);
4980 /* Notifier chain MUST detach us all upper devices. */
4981 WARN_ON(netdev_has_any_upper_dev(dev
));
4983 /* Remove entries from kobject tree */
4984 netdev_unregister_kobject(dev
);
4986 /* Remove XPS queueing entries */
4987 netif_reset_xps_queues_gt(dev
, 0);
4993 list_for_each_entry(dev
, head
, unreg_list
)
4997 static void rollback_registered(struct net_device
*dev
)
5001 list_add(&dev
->unreg_list
, &single
);
5002 rollback_registered_many(&single
);
5006 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5007 netdev_features_t features
)
5009 /* Fix illegal checksum combinations */
5010 if ((features
& NETIF_F_HW_CSUM
) &&
5011 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5012 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5013 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5016 /* TSO requires that SG is present as well. */
5017 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5018 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5019 features
&= ~NETIF_F_ALL_TSO
;
5022 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_HW_CSUM
) &&
5023 !(features
& NETIF_F_IP_CSUM
)) {
5024 netdev_dbg(dev
, "Dropping TSO features since no CSUM feature.\n");
5025 features
&= ~NETIF_F_TSO
;
5026 features
&= ~NETIF_F_TSO_ECN
;
5029 if ((features
& NETIF_F_TSO6
) && !(features
& NETIF_F_HW_CSUM
) &&
5030 !(features
& NETIF_F_IPV6_CSUM
)) {
5031 netdev_dbg(dev
, "Dropping TSO6 features since no CSUM feature.\n");
5032 features
&= ~NETIF_F_TSO6
;
5035 /* TSO ECN requires that TSO is present as well. */
5036 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5037 features
&= ~NETIF_F_TSO_ECN
;
5039 /* Software GSO depends on SG. */
5040 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5041 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5042 features
&= ~NETIF_F_GSO
;
5045 /* UFO needs SG and checksumming */
5046 if (features
& NETIF_F_UFO
) {
5047 /* maybe split UFO into V4 and V6? */
5048 if (!((features
& NETIF_F_GEN_CSUM
) ||
5049 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5050 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5052 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5053 features
&= ~NETIF_F_UFO
;
5056 if (!(features
& NETIF_F_SG
)) {
5058 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5059 features
&= ~NETIF_F_UFO
;
5066 int __netdev_update_features(struct net_device
*dev
)
5068 netdev_features_t features
;
5073 features
= netdev_get_wanted_features(dev
);
5075 if (dev
->netdev_ops
->ndo_fix_features
)
5076 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5078 /* driver might be less strict about feature dependencies */
5079 features
= netdev_fix_features(dev
, features
);
5081 if (dev
->features
== features
)
5084 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5085 &dev
->features
, &features
);
5087 if (dev
->netdev_ops
->ndo_set_features
)
5088 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5090 if (unlikely(err
< 0)) {
5092 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5093 err
, &features
, &dev
->features
);
5098 dev
->features
= features
;
5104 * netdev_update_features - recalculate device features
5105 * @dev: the device to check
5107 * Recalculate dev->features set and send notifications if it
5108 * has changed. Should be called after driver or hardware dependent
5109 * conditions might have changed that influence the features.
5111 void netdev_update_features(struct net_device
*dev
)
5113 if (__netdev_update_features(dev
))
5114 netdev_features_change(dev
);
5116 EXPORT_SYMBOL(netdev_update_features
);
5119 * netdev_change_features - recalculate device features
5120 * @dev: the device to check
5122 * Recalculate dev->features set and send notifications even
5123 * if they have not changed. Should be called instead of
5124 * netdev_update_features() if also dev->vlan_features might
5125 * have changed to allow the changes to be propagated to stacked
5128 void netdev_change_features(struct net_device
*dev
)
5130 __netdev_update_features(dev
);
5131 netdev_features_change(dev
);
5133 EXPORT_SYMBOL(netdev_change_features
);
5136 * netif_stacked_transfer_operstate - transfer operstate
5137 * @rootdev: the root or lower level device to transfer state from
5138 * @dev: the device to transfer operstate to
5140 * Transfer operational state from root to device. This is normally
5141 * called when a stacking relationship exists between the root
5142 * device and the device(a leaf device).
5144 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5145 struct net_device
*dev
)
5147 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5148 netif_dormant_on(dev
);
5150 netif_dormant_off(dev
);
5152 if (netif_carrier_ok(rootdev
)) {
5153 if (!netif_carrier_ok(dev
))
5154 netif_carrier_on(dev
);
5156 if (netif_carrier_ok(dev
))
5157 netif_carrier_off(dev
);
5160 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5163 static int netif_alloc_rx_queues(struct net_device
*dev
)
5165 unsigned int i
, count
= dev
->num_rx_queues
;
5166 struct netdev_rx_queue
*rx
;
5170 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5176 for (i
= 0; i
< count
; i
++)
5182 static void netdev_init_one_queue(struct net_device
*dev
,
5183 struct netdev_queue
*queue
, void *_unused
)
5185 /* Initialize queue lock */
5186 spin_lock_init(&queue
->_xmit_lock
);
5187 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5188 queue
->xmit_lock_owner
= -1;
5189 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5192 dql_init(&queue
->dql
, HZ
);
5196 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5198 unsigned int count
= dev
->num_tx_queues
;
5199 struct netdev_queue
*tx
;
5203 tx
= kcalloc(count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5209 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5210 spin_lock_init(&dev
->tx_global_lock
);
5216 * register_netdevice - register a network device
5217 * @dev: device to register
5219 * Take a completed network device structure and add it to the kernel
5220 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5221 * chain. 0 is returned on success. A negative errno code is returned
5222 * on a failure to set up the device, or if the name is a duplicate.
5224 * Callers must hold the rtnl semaphore. You may want
5225 * register_netdev() instead of this.
5228 * The locking appears insufficient to guarantee two parallel registers
5229 * will not get the same name.
5232 int register_netdevice(struct net_device
*dev
)
5235 struct net
*net
= dev_net(dev
);
5237 BUG_ON(dev_boot_phase
);
5242 /* When net_device's are persistent, this will be fatal. */
5243 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5246 spin_lock_init(&dev
->addr_list_lock
);
5247 netdev_set_addr_lockdep_class(dev
);
5251 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
5255 /* Init, if this function is available */
5256 if (dev
->netdev_ops
->ndo_init
) {
5257 ret
= dev
->netdev_ops
->ndo_init(dev
);
5265 if (((dev
->hw_features
| dev
->features
) &
5266 NETIF_F_HW_VLAN_CTAG_FILTER
) &&
5267 (!dev
->netdev_ops
->ndo_vlan_rx_add_vid
||
5268 !dev
->netdev_ops
->ndo_vlan_rx_kill_vid
)) {
5269 netdev_WARN(dev
, "Buggy VLAN acceleration in driver!\n");
5276 dev
->ifindex
= dev_new_index(net
);
5277 else if (__dev_get_by_index(net
, dev
->ifindex
))
5280 if (dev
->iflink
== -1)
5281 dev
->iflink
= dev
->ifindex
;
5283 /* Transfer changeable features to wanted_features and enable
5284 * software offloads (GSO and GRO).
5286 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5287 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5288 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5290 /* Turn on no cache copy if HW is doing checksum */
5291 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5292 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5293 if (dev
->features
& NETIF_F_ALL_CSUM
) {
5294 dev
->wanted_features
|= NETIF_F_NOCACHE_COPY
;
5295 dev
->features
|= NETIF_F_NOCACHE_COPY
;
5299 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5301 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5303 /* Make NETIF_F_SG inheritable to tunnel devices.
5305 dev
->hw_enc_features
|= NETIF_F_SG
;
5307 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5308 ret
= notifier_to_errno(ret
);
5312 ret
= netdev_register_kobject(dev
);
5315 dev
->reg_state
= NETREG_REGISTERED
;
5317 __netdev_update_features(dev
);
5320 * Default initial state at registry is that the
5321 * device is present.
5324 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5326 linkwatch_init_dev(dev
);
5328 dev_init_scheduler(dev
);
5330 list_netdevice(dev
);
5331 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5333 /* If the device has permanent device address, driver should
5334 * set dev_addr and also addr_assign_type should be set to
5335 * NET_ADDR_PERM (default value).
5337 if (dev
->addr_assign_type
== NET_ADDR_PERM
)
5338 memcpy(dev
->perm_addr
, dev
->dev_addr
, dev
->addr_len
);
5340 /* Notify protocols, that a new device appeared. */
5341 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5342 ret
= notifier_to_errno(ret
);
5344 rollback_registered(dev
);
5345 dev
->reg_state
= NETREG_UNREGISTERED
;
5348 * Prevent userspace races by waiting until the network
5349 * device is fully setup before sending notifications.
5351 if (!dev
->rtnl_link_ops
||
5352 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5353 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5359 if (dev
->netdev_ops
->ndo_uninit
)
5360 dev
->netdev_ops
->ndo_uninit(dev
);
5363 EXPORT_SYMBOL(register_netdevice
);
5366 * init_dummy_netdev - init a dummy network device for NAPI
5367 * @dev: device to init
5369 * This takes a network device structure and initialize the minimum
5370 * amount of fields so it can be used to schedule NAPI polls without
5371 * registering a full blown interface. This is to be used by drivers
5372 * that need to tie several hardware interfaces to a single NAPI
5373 * poll scheduler due to HW limitations.
5375 int init_dummy_netdev(struct net_device
*dev
)
5377 /* Clear everything. Note we don't initialize spinlocks
5378 * are they aren't supposed to be taken by any of the
5379 * NAPI code and this dummy netdev is supposed to be
5380 * only ever used for NAPI polls
5382 memset(dev
, 0, sizeof(struct net_device
));
5384 /* make sure we BUG if trying to hit standard
5385 * register/unregister code path
5387 dev
->reg_state
= NETREG_DUMMY
;
5389 /* NAPI wants this */
5390 INIT_LIST_HEAD(&dev
->napi_list
);
5392 /* a dummy interface is started by default */
5393 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5394 set_bit(__LINK_STATE_START
, &dev
->state
);
5396 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5397 * because users of this 'device' dont need to change
5403 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5407 * register_netdev - register a network device
5408 * @dev: device to register
5410 * Take a completed network device structure and add it to the kernel
5411 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5412 * chain. 0 is returned on success. A negative errno code is returned
5413 * on a failure to set up the device, or if the name is a duplicate.
5415 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5416 * and expands the device name if you passed a format string to
5419 int register_netdev(struct net_device
*dev
)
5424 err
= register_netdevice(dev
);
5428 EXPORT_SYMBOL(register_netdev
);
5430 int netdev_refcnt_read(const struct net_device
*dev
)
5434 for_each_possible_cpu(i
)
5435 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5438 EXPORT_SYMBOL(netdev_refcnt_read
);
5441 * netdev_wait_allrefs - wait until all references are gone.
5442 * @dev: target net_device
5444 * This is called when unregistering network devices.
5446 * Any protocol or device that holds a reference should register
5447 * for netdevice notification, and cleanup and put back the
5448 * reference if they receive an UNREGISTER event.
5449 * We can get stuck here if buggy protocols don't correctly
5452 static void netdev_wait_allrefs(struct net_device
*dev
)
5454 unsigned long rebroadcast_time
, warning_time
;
5457 linkwatch_forget_dev(dev
);
5459 rebroadcast_time
= warning_time
= jiffies
;
5460 refcnt
= netdev_refcnt_read(dev
);
5462 while (refcnt
!= 0) {
5463 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5466 /* Rebroadcast unregister notification */
5467 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5473 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5474 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5476 /* We must not have linkwatch events
5477 * pending on unregister. If this
5478 * happens, we simply run the queue
5479 * unscheduled, resulting in a noop
5482 linkwatch_run_queue();
5487 rebroadcast_time
= jiffies
;
5492 refcnt
= netdev_refcnt_read(dev
);
5494 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5495 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5497 warning_time
= jiffies
;
5506 * register_netdevice(x1);
5507 * register_netdevice(x2);
5509 * unregister_netdevice(y1);
5510 * unregister_netdevice(y2);
5516 * We are invoked by rtnl_unlock().
5517 * This allows us to deal with problems:
5518 * 1) We can delete sysfs objects which invoke hotplug
5519 * without deadlocking with linkwatch via keventd.
5520 * 2) Since we run with the RTNL semaphore not held, we can sleep
5521 * safely in order to wait for the netdev refcnt to drop to zero.
5523 * We must not return until all unregister events added during
5524 * the interval the lock was held have been completed.
5526 void netdev_run_todo(void)
5528 struct list_head list
;
5530 /* Snapshot list, allow later requests */
5531 list_replace_init(&net_todo_list
, &list
);
5536 /* Wait for rcu callbacks to finish before next phase */
5537 if (!list_empty(&list
))
5540 while (!list_empty(&list
)) {
5541 struct net_device
*dev
5542 = list_first_entry(&list
, struct net_device
, todo_list
);
5543 list_del(&dev
->todo_list
);
5546 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5549 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5550 pr_err("network todo '%s' but state %d\n",
5551 dev
->name
, dev
->reg_state
);
5556 dev
->reg_state
= NETREG_UNREGISTERED
;
5558 on_each_cpu(flush_backlog
, dev
, 1);
5560 netdev_wait_allrefs(dev
);
5563 BUG_ON(netdev_refcnt_read(dev
));
5564 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
5565 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
5566 WARN_ON(dev
->dn_ptr
);
5568 if (dev
->destructor
)
5569 dev
->destructor(dev
);
5571 /* Free network device */
5572 kobject_put(&dev
->dev
.kobj
);
5576 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5577 * fields in the same order, with only the type differing.
5579 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5580 const struct net_device_stats
*netdev_stats
)
5582 #if BITS_PER_LONG == 64
5583 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5584 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5586 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5587 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5588 u64
*dst
= (u64
*)stats64
;
5590 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5591 sizeof(*stats64
) / sizeof(u64
));
5592 for (i
= 0; i
< n
; i
++)
5596 EXPORT_SYMBOL(netdev_stats_to_stats64
);
5599 * dev_get_stats - get network device statistics
5600 * @dev: device to get statistics from
5601 * @storage: place to store stats
5603 * Get network statistics from device. Return @storage.
5604 * The device driver may provide its own method by setting
5605 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5606 * otherwise the internal statistics structure is used.
5608 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5609 struct rtnl_link_stats64
*storage
)
5611 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5613 if (ops
->ndo_get_stats64
) {
5614 memset(storage
, 0, sizeof(*storage
));
5615 ops
->ndo_get_stats64(dev
, storage
);
5616 } else if (ops
->ndo_get_stats
) {
5617 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5619 netdev_stats_to_stats64(storage
, &dev
->stats
);
5621 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
5624 EXPORT_SYMBOL(dev_get_stats
);
5626 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
5628 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
5630 #ifdef CONFIG_NET_CLS_ACT
5633 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
5636 netdev_init_one_queue(dev
, queue
, NULL
);
5637 queue
->qdisc
= &noop_qdisc
;
5638 queue
->qdisc_sleeping
= &noop_qdisc
;
5639 rcu_assign_pointer(dev
->ingress_queue
, queue
);
5644 static const struct ethtool_ops default_ethtool_ops
;
5646 void netdev_set_default_ethtool_ops(struct net_device
*dev
,
5647 const struct ethtool_ops
*ops
)
5649 if (dev
->ethtool_ops
== &default_ethtool_ops
)
5650 dev
->ethtool_ops
= ops
;
5652 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops
);
5655 * alloc_netdev_mqs - allocate network device
5656 * @sizeof_priv: size of private data to allocate space for
5657 * @name: device name format string
5658 * @setup: callback to initialize device
5659 * @txqs: the number of TX subqueues to allocate
5660 * @rxqs: the number of RX subqueues to allocate
5662 * Allocates a struct net_device with private data area for driver use
5663 * and performs basic initialization. Also allocates subquue structs
5664 * for each queue on the device.
5666 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
5667 void (*setup
)(struct net_device
*),
5668 unsigned int txqs
, unsigned int rxqs
)
5670 struct net_device
*dev
;
5672 struct net_device
*p
;
5674 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5677 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5683 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5688 alloc_size
= sizeof(struct net_device
);
5690 /* ensure 32-byte alignment of private area */
5691 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5692 alloc_size
+= sizeof_priv
;
5694 /* ensure 32-byte alignment of whole construct */
5695 alloc_size
+= NETDEV_ALIGN
- 1;
5697 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5701 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5702 dev
->padded
= (char *)dev
- (char *)p
;
5704 dev
->pcpu_refcnt
= alloc_percpu(int);
5705 if (!dev
->pcpu_refcnt
)
5708 if (dev_addr_init(dev
))
5714 dev_net_set(dev
, &init_net
);
5716 dev
->gso_max_size
= GSO_MAX_SIZE
;
5717 dev
->gso_max_segs
= GSO_MAX_SEGS
;
5719 INIT_LIST_HEAD(&dev
->napi_list
);
5720 INIT_LIST_HEAD(&dev
->unreg_list
);
5721 INIT_LIST_HEAD(&dev
->link_watch_list
);
5722 INIT_LIST_HEAD(&dev
->upper_dev_list
);
5723 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
5726 dev
->num_tx_queues
= txqs
;
5727 dev
->real_num_tx_queues
= txqs
;
5728 if (netif_alloc_netdev_queues(dev
))
5732 dev
->num_rx_queues
= rxqs
;
5733 dev
->real_num_rx_queues
= rxqs
;
5734 if (netif_alloc_rx_queues(dev
))
5738 strcpy(dev
->name
, name
);
5739 dev
->group
= INIT_NETDEV_GROUP
;
5740 if (!dev
->ethtool_ops
)
5741 dev
->ethtool_ops
= &default_ethtool_ops
;
5749 free_percpu(dev
->pcpu_refcnt
);
5759 EXPORT_SYMBOL(alloc_netdev_mqs
);
5762 * free_netdev - free network device
5765 * This function does the last stage of destroying an allocated device
5766 * interface. The reference to the device object is released.
5767 * If this is the last reference then it will be freed.
5769 void free_netdev(struct net_device
*dev
)
5771 struct napi_struct
*p
, *n
;
5773 release_net(dev_net(dev
));
5780 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
5782 /* Flush device addresses */
5783 dev_addr_flush(dev
);
5785 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
5788 free_percpu(dev
->pcpu_refcnt
);
5789 dev
->pcpu_refcnt
= NULL
;
5791 /* Compatibility with error handling in drivers */
5792 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5793 kfree((char *)dev
- dev
->padded
);
5797 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
5798 dev
->reg_state
= NETREG_RELEASED
;
5800 /* will free via device release */
5801 put_device(&dev
->dev
);
5803 EXPORT_SYMBOL(free_netdev
);
5806 * synchronize_net - Synchronize with packet receive processing
5808 * Wait for packets currently being received to be done.
5809 * Does not block later packets from starting.
5811 void synchronize_net(void)
5814 if (rtnl_is_locked())
5815 synchronize_rcu_expedited();
5819 EXPORT_SYMBOL(synchronize_net
);
5822 * unregister_netdevice_queue - remove device from the kernel
5826 * This function shuts down a device interface and removes it
5827 * from the kernel tables.
5828 * If head not NULL, device is queued to be unregistered later.
5830 * Callers must hold the rtnl semaphore. You may want
5831 * unregister_netdev() instead of this.
5834 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
5839 list_move_tail(&dev
->unreg_list
, head
);
5841 rollback_registered(dev
);
5842 /* Finish processing unregister after unlock */
5846 EXPORT_SYMBOL(unregister_netdevice_queue
);
5849 * unregister_netdevice_many - unregister many devices
5850 * @head: list of devices
5852 * Note: As most callers use a stack allocated list_head,
5853 * we force a list_del() to make sure stack wont be corrupted later.
5855 void unregister_netdevice_many(struct list_head
*head
)
5857 struct net_device
*dev
;
5859 if (!list_empty(head
)) {
5860 rollback_registered_many(head
);
5861 list_for_each_entry(dev
, head
, unreg_list
)
5866 EXPORT_SYMBOL(unregister_netdevice_many
);
5869 * unregister_netdev - remove device from the kernel
5872 * This function shuts down a device interface and removes it
5873 * from the kernel tables.
5875 * This is just a wrapper for unregister_netdevice that takes
5876 * the rtnl semaphore. In general you want to use this and not
5877 * unregister_netdevice.
5879 void unregister_netdev(struct net_device
*dev
)
5882 unregister_netdevice(dev
);
5885 EXPORT_SYMBOL(unregister_netdev
);
5888 * dev_change_net_namespace - move device to different nethost namespace
5890 * @net: network namespace
5891 * @pat: If not NULL name pattern to try if the current device name
5892 * is already taken in the destination network namespace.
5894 * This function shuts down a device interface and moves it
5895 * to a new network namespace. On success 0 is returned, on
5896 * a failure a netagive errno code is returned.
5898 * Callers must hold the rtnl semaphore.
5901 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
5907 /* Don't allow namespace local devices to be moved. */
5909 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
5912 /* Ensure the device has been registrered */
5913 if (dev
->reg_state
!= NETREG_REGISTERED
)
5916 /* Get out if there is nothing todo */
5918 if (net_eq(dev_net(dev
), net
))
5921 /* Pick the destination device name, and ensure
5922 * we can use it in the destination network namespace.
5925 if (__dev_get_by_name(net
, dev
->name
)) {
5926 /* We get here if we can't use the current device name */
5929 if (dev_get_valid_name(net
, dev
, pat
) < 0)
5934 * And now a mini version of register_netdevice unregister_netdevice.
5937 /* If device is running close it first. */
5940 /* And unlink it from device chain */
5942 unlist_netdevice(dev
);
5946 /* Shutdown queueing discipline. */
5949 /* Notify protocols, that we are about to destroy
5950 this device. They should clean all the things.
5952 Note that dev->reg_state stays at NETREG_REGISTERED.
5953 This is wanted because this way 8021q and macvlan know
5954 the device is just moving and can keep their slaves up.
5956 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5958 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5959 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
5962 * Flush the unicast and multicast chains
5967 /* Send a netdev-removed uevent to the old namespace */
5968 kobject_uevent(&dev
->dev
.kobj
, KOBJ_REMOVE
);
5970 /* Actually switch the network namespace */
5971 dev_net_set(dev
, net
);
5973 /* If there is an ifindex conflict assign a new one */
5974 if (__dev_get_by_index(net
, dev
->ifindex
)) {
5975 int iflink
= (dev
->iflink
== dev
->ifindex
);
5976 dev
->ifindex
= dev_new_index(net
);
5978 dev
->iflink
= dev
->ifindex
;
5981 /* Send a netdev-add uevent to the new namespace */
5982 kobject_uevent(&dev
->dev
.kobj
, KOBJ_ADD
);
5984 /* Fixup kobjects */
5985 err
= device_rename(&dev
->dev
, dev
->name
);
5988 /* Add the device back in the hashes */
5989 list_netdevice(dev
);
5991 /* Notify protocols, that a new device appeared. */
5992 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5995 * Prevent userspace races by waiting until the network
5996 * device is fully setup before sending notifications.
5998 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
6005 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6007 static int dev_cpu_callback(struct notifier_block
*nfb
,
6008 unsigned long action
,
6011 struct sk_buff
**list_skb
;
6012 struct sk_buff
*skb
;
6013 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6014 struct softnet_data
*sd
, *oldsd
;
6016 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6019 local_irq_disable();
6020 cpu
= smp_processor_id();
6021 sd
= &per_cpu(softnet_data
, cpu
);
6022 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6024 /* Find end of our completion_queue. */
6025 list_skb
= &sd
->completion_queue
;
6027 list_skb
= &(*list_skb
)->next
;
6028 /* Append completion queue from offline CPU. */
6029 *list_skb
= oldsd
->completion_queue
;
6030 oldsd
->completion_queue
= NULL
;
6032 /* Append output queue from offline CPU. */
6033 if (oldsd
->output_queue
) {
6034 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6035 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6036 oldsd
->output_queue
= NULL
;
6037 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6039 /* Append NAPI poll list from offline CPU. */
6040 if (!list_empty(&oldsd
->poll_list
)) {
6041 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6042 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6045 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6048 /* Process offline CPU's input_pkt_queue */
6049 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6051 input_queue_head_incr(oldsd
);
6053 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6055 input_queue_head_incr(oldsd
);
6063 * netdev_increment_features - increment feature set by one
6064 * @all: current feature set
6065 * @one: new feature set
6066 * @mask: mask feature set
6068 * Computes a new feature set after adding a device with feature set
6069 * @one to the master device with current feature set @all. Will not
6070 * enable anything that is off in @mask. Returns the new feature set.
6072 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6073 netdev_features_t one
, netdev_features_t mask
)
6075 if (mask
& NETIF_F_GEN_CSUM
)
6076 mask
|= NETIF_F_ALL_CSUM
;
6077 mask
|= NETIF_F_VLAN_CHALLENGED
;
6079 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6080 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6082 /* If one device supports hw checksumming, set for all. */
6083 if (all
& NETIF_F_GEN_CSUM
)
6084 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6088 EXPORT_SYMBOL(netdev_increment_features
);
6090 static struct hlist_head
*netdev_create_hash(void)
6093 struct hlist_head
*hash
;
6095 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6097 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6098 INIT_HLIST_HEAD(&hash
[i
]);
6103 /* Initialize per network namespace state */
6104 static int __net_init
netdev_init(struct net
*net
)
6106 if (net
!= &init_net
)
6107 INIT_LIST_HEAD(&net
->dev_base_head
);
6109 net
->dev_name_head
= netdev_create_hash();
6110 if (net
->dev_name_head
== NULL
)
6113 net
->dev_index_head
= netdev_create_hash();
6114 if (net
->dev_index_head
== NULL
)
6120 kfree(net
->dev_name_head
);
6126 * netdev_drivername - network driver for the device
6127 * @dev: network device
6129 * Determine network driver for device.
6131 const char *netdev_drivername(const struct net_device
*dev
)
6133 const struct device_driver
*driver
;
6134 const struct device
*parent
;
6135 const char *empty
= "";
6137 parent
= dev
->dev
.parent
;
6141 driver
= parent
->driver
;
6142 if (driver
&& driver
->name
)
6143 return driver
->name
;
6147 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6148 struct va_format
*vaf
)
6152 if (dev
&& dev
->dev
.parent
) {
6153 r
= dev_printk_emit(level
[1] - '0',
6156 dev_driver_string(dev
->dev
.parent
),
6157 dev_name(dev
->dev
.parent
),
6158 netdev_name(dev
), vaf
);
6160 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6162 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6168 int netdev_printk(const char *level
, const struct net_device
*dev
,
6169 const char *format
, ...)
6171 struct va_format vaf
;
6175 va_start(args
, format
);
6180 r
= __netdev_printk(level
, dev
, &vaf
);
6186 EXPORT_SYMBOL(netdev_printk
);
6188 #define define_netdev_printk_level(func, level) \
6189 int func(const struct net_device *dev, const char *fmt, ...) \
6192 struct va_format vaf; \
6195 va_start(args, fmt); \
6200 r = __netdev_printk(level, dev, &vaf); \
6206 EXPORT_SYMBOL(func);
6208 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6209 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6210 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6211 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6212 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6213 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6214 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6216 static void __net_exit
netdev_exit(struct net
*net
)
6218 kfree(net
->dev_name_head
);
6219 kfree(net
->dev_index_head
);
6222 static struct pernet_operations __net_initdata netdev_net_ops
= {
6223 .init
= netdev_init
,
6224 .exit
= netdev_exit
,
6227 static void __net_exit
default_device_exit(struct net
*net
)
6229 struct net_device
*dev
, *aux
;
6231 * Push all migratable network devices back to the
6232 * initial network namespace
6235 for_each_netdev_safe(net
, dev
, aux
) {
6237 char fb_name
[IFNAMSIZ
];
6239 /* Ignore unmoveable devices (i.e. loopback) */
6240 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6243 /* Leave virtual devices for the generic cleanup */
6244 if (dev
->rtnl_link_ops
)
6247 /* Push remaining network devices to init_net */
6248 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6249 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6251 pr_emerg("%s: failed to move %s to init_net: %d\n",
6252 __func__
, dev
->name
, err
);
6259 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6261 /* At exit all network devices most be removed from a network
6262 * namespace. Do this in the reverse order of registration.
6263 * Do this across as many network namespaces as possible to
6264 * improve batching efficiency.
6266 struct net_device
*dev
;
6268 LIST_HEAD(dev_kill_list
);
6271 list_for_each_entry(net
, net_list
, exit_list
) {
6272 for_each_netdev_reverse(net
, dev
) {
6273 if (dev
->rtnl_link_ops
)
6274 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6276 unregister_netdevice_queue(dev
, &dev_kill_list
);
6279 unregister_netdevice_many(&dev_kill_list
);
6283 static struct pernet_operations __net_initdata default_device_ops
= {
6284 .exit
= default_device_exit
,
6285 .exit_batch
= default_device_exit_batch
,
6289 * Initialize the DEV module. At boot time this walks the device list and
6290 * unhooks any devices that fail to initialise (normally hardware not
6291 * present) and leaves us with a valid list of present and active devices.
6296 * This is called single threaded during boot, so no need
6297 * to take the rtnl semaphore.
6299 static int __init
net_dev_init(void)
6301 int i
, rc
= -ENOMEM
;
6303 BUG_ON(!dev_boot_phase
);
6305 if (dev_proc_init())
6308 if (netdev_kobject_init())
6311 INIT_LIST_HEAD(&ptype_all
);
6312 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6313 INIT_LIST_HEAD(&ptype_base
[i
]);
6315 INIT_LIST_HEAD(&offload_base
);
6317 if (register_pernet_subsys(&netdev_net_ops
))
6321 * Initialise the packet receive queues.
6324 for_each_possible_cpu(i
) {
6325 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6327 memset(sd
, 0, sizeof(*sd
));
6328 skb_queue_head_init(&sd
->input_pkt_queue
);
6329 skb_queue_head_init(&sd
->process_queue
);
6330 sd
->completion_queue
= NULL
;
6331 INIT_LIST_HEAD(&sd
->poll_list
);
6332 sd
->output_queue
= NULL
;
6333 sd
->output_queue_tailp
= &sd
->output_queue
;
6335 sd
->csd
.func
= rps_trigger_softirq
;
6341 sd
->backlog
.poll
= process_backlog
;
6342 sd
->backlog
.weight
= weight_p
;
6343 sd
->backlog
.gro_list
= NULL
;
6344 sd
->backlog
.gro_count
= 0;
6349 /* The loopback device is special if any other network devices
6350 * is present in a network namespace the loopback device must
6351 * be present. Since we now dynamically allocate and free the
6352 * loopback device ensure this invariant is maintained by
6353 * keeping the loopback device as the first device on the
6354 * list of network devices. Ensuring the loopback devices
6355 * is the first device that appears and the last network device
6358 if (register_pernet_device(&loopback_net_ops
))
6361 if (register_pernet_device(&default_device_ops
))
6364 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6365 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6367 hotcpu_notifier(dev_cpu_callback
, 0);
6374 subsys_initcall(net_dev_init
);