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 <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <linux/pci.h>
133 #include "net-sysfs.h"
135 /* Instead of increasing this, you should create a hash table. */
136 #define MAX_GRO_SKBS 8
138 /* This should be increased if a protocol with a bigger head is added. */
139 #define GRO_MAX_HEAD (MAX_HEADER + 128)
142 * The list of packet types we will receive (as opposed to discard)
143 * and the routines to invoke.
145 * Why 16. Because with 16 the only overlap we get on a hash of the
146 * low nibble of the protocol value is RARP/SNAP/X.25.
148 * NOTE: That is no longer true with the addition of VLAN tags. Not
149 * sure which should go first, but I bet it won't make much
150 * difference if we are running VLANs. The good news is that
151 * this protocol won't be in the list unless compiled in, so
152 * the average user (w/out VLANs) will not be adversely affected.
169 #define PTYPE_HASH_SIZE (16)
170 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
172 static DEFINE_SPINLOCK(ptype_lock
);
173 static struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
174 static struct list_head ptype_all __read_mostly
; /* Taps */
177 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
180 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
182 * Writers must hold the rtnl semaphore while they loop through the
183 * dev_base_head list, and hold dev_base_lock for writing when they do the
184 * actual updates. This allows pure readers to access the list even
185 * while a writer is preparing to update it.
187 * To put it another way, dev_base_lock is held for writing only to
188 * protect against pure readers; the rtnl semaphore provides the
189 * protection against other writers.
191 * See, for example usages, register_netdevice() and
192 * unregister_netdevice(), which must be called with the rtnl
195 DEFINE_RWLOCK(dev_base_lock
);
196 EXPORT_SYMBOL(dev_base_lock
);
198 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
200 unsigned hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
201 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
204 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
206 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
209 static inline void rps_lock(struct softnet_data
*sd
)
212 spin_lock(&sd
->input_pkt_queue
.lock
);
216 static inline void rps_unlock(struct softnet_data
*sd
)
219 spin_unlock(&sd
->input_pkt_queue
.lock
);
223 /* Device list insertion */
224 static int list_netdevice(struct net_device
*dev
)
226 struct net
*net
= dev_net(dev
);
230 write_lock_bh(&dev_base_lock
);
231 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
232 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
233 hlist_add_head_rcu(&dev
->index_hlist
,
234 dev_index_hash(net
, dev
->ifindex
));
235 write_unlock_bh(&dev_base_lock
);
239 /* Device list removal
240 * caller must respect a RCU grace period before freeing/reusing dev
242 static void unlist_netdevice(struct net_device
*dev
)
246 /* Unlink dev from the device chain */
247 write_lock_bh(&dev_base_lock
);
248 list_del_rcu(&dev
->dev_list
);
249 hlist_del_rcu(&dev
->name_hlist
);
250 hlist_del_rcu(&dev
->index_hlist
);
251 write_unlock_bh(&dev_base_lock
);
258 static RAW_NOTIFIER_HEAD(netdev_chain
);
261 * Device drivers call our routines to queue packets here. We empty the
262 * queue in the local softnet handler.
265 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
266 EXPORT_PER_CPU_SYMBOL(softnet_data
);
268 #ifdef CONFIG_LOCKDEP
270 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
271 * according to dev->type
273 static const unsigned short netdev_lock_type
[] =
274 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
275 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
276 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
277 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
278 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
279 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
280 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
281 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
282 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
283 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
284 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
285 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
286 ARPHRD_FCFABRIC
, ARPHRD_IEEE802_TR
, ARPHRD_IEEE80211
,
287 ARPHRD_IEEE80211_PRISM
, ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
,
288 ARPHRD_PHONET_PIPE
, ARPHRD_IEEE802154
,
289 ARPHRD_VOID
, ARPHRD_NONE
};
291 static const char *const netdev_lock_name
[] =
292 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
293 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
294 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
295 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
296 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
297 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
298 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
299 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
300 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
301 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
302 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
303 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
304 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
305 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
306 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
307 "_xmit_VOID", "_xmit_NONE"};
309 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
310 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
312 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
316 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
317 if (netdev_lock_type
[i
] == dev_type
)
319 /* the last key is used by default */
320 return ARRAY_SIZE(netdev_lock_type
) - 1;
323 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
324 unsigned short dev_type
)
328 i
= netdev_lock_pos(dev_type
);
329 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
330 netdev_lock_name
[i
]);
333 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
337 i
= netdev_lock_pos(dev
->type
);
338 lockdep_set_class_and_name(&dev
->addr_list_lock
,
339 &netdev_addr_lock_key
[i
],
340 netdev_lock_name
[i
]);
343 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
344 unsigned short dev_type
)
347 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
352 /*******************************************************************************
354 Protocol management and registration routines
356 *******************************************************************************/
359 * Add a protocol ID to the list. Now that the input handler is
360 * smarter we can dispense with all the messy stuff that used to be
363 * BEWARE!!! Protocol handlers, mangling input packets,
364 * MUST BE last in hash buckets and checking protocol handlers
365 * MUST start from promiscuous ptype_all chain in net_bh.
366 * It is true now, do not change it.
367 * Explanation follows: if protocol handler, mangling packet, will
368 * be the first on list, it is not able to sense, that packet
369 * is cloned and should be copied-on-write, so that it will
370 * change it and subsequent readers will get broken packet.
375 * dev_add_pack - add packet handler
376 * @pt: packet type declaration
378 * Add a protocol handler to the networking stack. The passed &packet_type
379 * is linked into kernel lists and may not be freed until it has been
380 * removed from the kernel lists.
382 * This call does not sleep therefore it can not
383 * guarantee all CPU's that are in middle of receiving packets
384 * will see the new packet type (until the next received packet).
387 void dev_add_pack(struct packet_type
*pt
)
391 spin_lock_bh(&ptype_lock
);
392 if (pt
->type
== htons(ETH_P_ALL
))
393 list_add_rcu(&pt
->list
, &ptype_all
);
395 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
396 list_add_rcu(&pt
->list
, &ptype_base
[hash
]);
398 spin_unlock_bh(&ptype_lock
);
400 EXPORT_SYMBOL(dev_add_pack
);
403 * __dev_remove_pack - remove packet handler
404 * @pt: packet type declaration
406 * Remove a protocol handler that was previously added to the kernel
407 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
408 * from the kernel lists and can be freed or reused once this function
411 * The packet type might still be in use by receivers
412 * and must not be freed until after all the CPU's have gone
413 * through a quiescent state.
415 void __dev_remove_pack(struct packet_type
*pt
)
417 struct list_head
*head
;
418 struct packet_type
*pt1
;
420 spin_lock_bh(&ptype_lock
);
422 if (pt
->type
== htons(ETH_P_ALL
))
425 head
= &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
427 list_for_each_entry(pt1
, head
, list
) {
429 list_del_rcu(&pt
->list
);
434 printk(KERN_WARNING
"dev_remove_pack: %p not found.\n", pt
);
436 spin_unlock_bh(&ptype_lock
);
438 EXPORT_SYMBOL(__dev_remove_pack
);
441 * dev_remove_pack - remove packet handler
442 * @pt: packet type declaration
444 * Remove a protocol handler that was previously added to the kernel
445 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
446 * from the kernel lists and can be freed or reused once this function
449 * This call sleeps to guarantee that no CPU is looking at the packet
452 void dev_remove_pack(struct packet_type
*pt
)
454 __dev_remove_pack(pt
);
458 EXPORT_SYMBOL(dev_remove_pack
);
460 /******************************************************************************
462 Device Boot-time Settings Routines
464 *******************************************************************************/
466 /* Boot time configuration table */
467 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
470 * netdev_boot_setup_add - add new setup entry
471 * @name: name of the device
472 * @map: configured settings for the device
474 * Adds new setup entry to the dev_boot_setup list. The function
475 * returns 0 on error and 1 on success. This is a generic routine to
478 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
480 struct netdev_boot_setup
*s
;
484 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
485 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
486 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
487 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
488 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
493 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
497 * netdev_boot_setup_check - check boot time settings
498 * @dev: the netdevice
500 * Check boot time settings for the device.
501 * The found settings are set for the device to be used
502 * later in the device probing.
503 * Returns 0 if no settings found, 1 if they are.
505 int netdev_boot_setup_check(struct net_device
*dev
)
507 struct netdev_boot_setup
*s
= dev_boot_setup
;
510 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
511 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
512 !strcmp(dev
->name
, s
[i
].name
)) {
513 dev
->irq
= s
[i
].map
.irq
;
514 dev
->base_addr
= s
[i
].map
.base_addr
;
515 dev
->mem_start
= s
[i
].map
.mem_start
;
516 dev
->mem_end
= s
[i
].map
.mem_end
;
522 EXPORT_SYMBOL(netdev_boot_setup_check
);
526 * netdev_boot_base - get address from boot time settings
527 * @prefix: prefix for network device
528 * @unit: id for network device
530 * Check boot time settings for the base address of device.
531 * The found settings are set for the device to be used
532 * later in the device probing.
533 * Returns 0 if no settings found.
535 unsigned long netdev_boot_base(const char *prefix
, int unit
)
537 const struct netdev_boot_setup
*s
= dev_boot_setup
;
541 sprintf(name
, "%s%d", prefix
, unit
);
544 * If device already registered then return base of 1
545 * to indicate not to probe for this interface
547 if (__dev_get_by_name(&init_net
, name
))
550 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
551 if (!strcmp(name
, s
[i
].name
))
552 return s
[i
].map
.base_addr
;
557 * Saves at boot time configured settings for any netdevice.
559 int __init
netdev_boot_setup(char *str
)
564 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
569 memset(&map
, 0, sizeof(map
));
573 map
.base_addr
= ints
[2];
575 map
.mem_start
= ints
[3];
577 map
.mem_end
= ints
[4];
579 /* Add new entry to the list */
580 return netdev_boot_setup_add(str
, &map
);
583 __setup("netdev=", netdev_boot_setup
);
585 /*******************************************************************************
587 Device Interface Subroutines
589 *******************************************************************************/
592 * __dev_get_by_name - find a device by its name
593 * @net: the applicable net namespace
594 * @name: name to find
596 * Find an interface by name. Must be called under RTNL semaphore
597 * or @dev_base_lock. If the name is found a pointer to the device
598 * is returned. If the name is not found then %NULL is returned. The
599 * reference counters are not incremented so the caller must be
600 * careful with locks.
603 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
605 struct hlist_node
*p
;
606 struct net_device
*dev
;
607 struct hlist_head
*head
= dev_name_hash(net
, name
);
609 hlist_for_each_entry(dev
, p
, head
, name_hlist
)
610 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
615 EXPORT_SYMBOL(__dev_get_by_name
);
618 * dev_get_by_name_rcu - find a device by its name
619 * @net: the applicable net namespace
620 * @name: name to find
622 * Find an interface by name.
623 * If the name is found a pointer to the device is returned.
624 * If the name is not found then %NULL is returned.
625 * The reference counters are not incremented so the caller must be
626 * careful with locks. The caller must hold RCU lock.
629 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
631 struct hlist_node
*p
;
632 struct net_device
*dev
;
633 struct hlist_head
*head
= dev_name_hash(net
, name
);
635 hlist_for_each_entry_rcu(dev
, p
, head
, name_hlist
)
636 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
641 EXPORT_SYMBOL(dev_get_by_name_rcu
);
644 * dev_get_by_name - find a device by its name
645 * @net: the applicable net namespace
646 * @name: name to find
648 * Find an interface by name. This can be called from any
649 * context and does its own locking. The returned handle has
650 * the usage count incremented and the caller must use dev_put() to
651 * release it when it is no longer needed. %NULL is returned if no
652 * matching device is found.
655 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
657 struct net_device
*dev
;
660 dev
= dev_get_by_name_rcu(net
, name
);
666 EXPORT_SYMBOL(dev_get_by_name
);
669 * __dev_get_by_index - find a device by its ifindex
670 * @net: the applicable net namespace
671 * @ifindex: index of device
673 * Search for an interface by index. Returns %NULL if the device
674 * is not found or a pointer to the device. The device has not
675 * had its reference counter increased so the caller must be careful
676 * about locking. The caller must hold either the RTNL semaphore
680 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
682 struct hlist_node
*p
;
683 struct net_device
*dev
;
684 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
686 hlist_for_each_entry(dev
, p
, head
, index_hlist
)
687 if (dev
->ifindex
== ifindex
)
692 EXPORT_SYMBOL(__dev_get_by_index
);
695 * dev_get_by_index_rcu - find a device by its ifindex
696 * @net: the applicable net namespace
697 * @ifindex: index of device
699 * Search for an interface by index. Returns %NULL if the device
700 * is not found or a pointer to the device. The device has not
701 * had its reference counter increased so the caller must be careful
702 * about locking. The caller must hold RCU lock.
705 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
707 struct hlist_node
*p
;
708 struct net_device
*dev
;
709 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
711 hlist_for_each_entry_rcu(dev
, p
, head
, index_hlist
)
712 if (dev
->ifindex
== ifindex
)
717 EXPORT_SYMBOL(dev_get_by_index_rcu
);
721 * dev_get_by_index - find a device by its ifindex
722 * @net: the applicable net namespace
723 * @ifindex: index of device
725 * Search for an interface by index. Returns NULL if the device
726 * is not found or a pointer to the device. The device returned has
727 * had a reference added and the pointer is safe until the user calls
728 * dev_put to indicate they have finished with it.
731 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
733 struct net_device
*dev
;
736 dev
= dev_get_by_index_rcu(net
, ifindex
);
742 EXPORT_SYMBOL(dev_get_by_index
);
745 * dev_getbyhwaddr - find a device by its hardware address
746 * @net: the applicable net namespace
747 * @type: media type of device
748 * @ha: hardware address
750 * Search for an interface by MAC address. Returns NULL if the device
751 * is not found or a pointer to the device. The caller must hold the
752 * rtnl semaphore. The returned device has not had its ref count increased
753 * and the caller must therefore be careful about locking
756 * If the API was consistent this would be __dev_get_by_hwaddr
759 struct net_device
*dev_getbyhwaddr(struct net
*net
, unsigned short type
, char *ha
)
761 struct net_device
*dev
;
765 for_each_netdev(net
, dev
)
766 if (dev
->type
== type
&&
767 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
772 EXPORT_SYMBOL(dev_getbyhwaddr
);
774 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
776 struct net_device
*dev
;
779 for_each_netdev(net
, dev
)
780 if (dev
->type
== type
)
785 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
787 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
789 struct net_device
*dev
, *ret
= NULL
;
792 for_each_netdev_rcu(net
, dev
)
793 if (dev
->type
== type
) {
801 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
804 * dev_get_by_flags_rcu - find any device with given flags
805 * @net: the applicable net namespace
806 * @if_flags: IFF_* values
807 * @mask: bitmask of bits in if_flags to check
809 * Search for any interface with the given flags. Returns NULL if a device
810 * is not found or a pointer to the device. Must be called inside
811 * rcu_read_lock(), and result refcount is unchanged.
814 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
817 struct net_device
*dev
, *ret
;
820 for_each_netdev_rcu(net
, dev
) {
821 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
828 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
831 * dev_valid_name - check if name is okay for network device
834 * Network device names need to be valid file names to
835 * to allow sysfs to work. We also disallow any kind of
838 int dev_valid_name(const char *name
)
842 if (strlen(name
) >= IFNAMSIZ
)
844 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
848 if (*name
== '/' || isspace(*name
))
854 EXPORT_SYMBOL(dev_valid_name
);
857 * __dev_alloc_name - allocate a name for a device
858 * @net: network namespace to allocate the device name in
859 * @name: name format string
860 * @buf: scratch buffer and result name string
862 * Passed a format string - eg "lt%d" it will try and find a suitable
863 * id. It scans list of devices to build up a free map, then chooses
864 * the first empty slot. The caller must hold the dev_base or rtnl lock
865 * while allocating the name and adding the device in order to avoid
867 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
868 * Returns the number of the unit assigned or a negative errno code.
871 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
875 const int max_netdevices
= 8*PAGE_SIZE
;
876 unsigned long *inuse
;
877 struct net_device
*d
;
879 p
= strnchr(name
, IFNAMSIZ
-1, '%');
882 * Verify the string as this thing may have come from
883 * the user. There must be either one "%d" and no other "%"
886 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
889 /* Use one page as a bit array of possible slots */
890 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
894 for_each_netdev(net
, d
) {
895 if (!sscanf(d
->name
, name
, &i
))
897 if (i
< 0 || i
>= max_netdevices
)
900 /* avoid cases where sscanf is not exact inverse of printf */
901 snprintf(buf
, IFNAMSIZ
, name
, i
);
902 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
906 i
= find_first_zero_bit(inuse
, max_netdevices
);
907 free_page((unsigned long) inuse
);
911 snprintf(buf
, IFNAMSIZ
, name
, i
);
912 if (!__dev_get_by_name(net
, buf
))
915 /* It is possible to run out of possible slots
916 * when the name is long and there isn't enough space left
917 * for the digits, or if all bits are used.
923 * dev_alloc_name - allocate a name for a device
925 * @name: name format string
927 * Passed a format string - eg "lt%d" it will try and find a suitable
928 * id. It scans list of devices to build up a free map, then chooses
929 * the first empty slot. The caller must hold the dev_base or rtnl lock
930 * while allocating the name and adding the device in order to avoid
932 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
933 * Returns the number of the unit assigned or a negative errno code.
936 int dev_alloc_name(struct net_device
*dev
, const char *name
)
942 BUG_ON(!dev_net(dev
));
944 ret
= __dev_alloc_name(net
, name
, buf
);
946 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
949 EXPORT_SYMBOL(dev_alloc_name
);
951 static int dev_get_valid_name(struct net_device
*dev
, const char *name
, bool fmt
)
955 BUG_ON(!dev_net(dev
));
958 if (!dev_valid_name(name
))
961 if (fmt
&& strchr(name
, '%'))
962 return dev_alloc_name(dev
, name
);
963 else if (__dev_get_by_name(net
, name
))
965 else if (dev
->name
!= name
)
966 strlcpy(dev
->name
, name
, IFNAMSIZ
);
972 * dev_change_name - change name of a device
974 * @newname: name (or format string) must be at least IFNAMSIZ
976 * Change name of a device, can pass format strings "eth%d".
979 int dev_change_name(struct net_device
*dev
, const char *newname
)
981 char oldname
[IFNAMSIZ
];
987 BUG_ON(!dev_net(dev
));
990 if (dev
->flags
& IFF_UP
)
993 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0)
996 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
998 err
= dev_get_valid_name(dev
, newname
, 1);
1003 ret
= device_rename(&dev
->dev
, dev
->name
);
1005 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1009 write_lock_bh(&dev_base_lock
);
1010 hlist_del(&dev
->name_hlist
);
1011 write_unlock_bh(&dev_base_lock
);
1015 write_lock_bh(&dev_base_lock
);
1016 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1017 write_unlock_bh(&dev_base_lock
);
1019 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1020 ret
= notifier_to_errno(ret
);
1023 /* err >= 0 after dev_alloc_name() or stores the first errno */
1026 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1030 "%s: name change rollback failed: %d.\n",
1039 * dev_set_alias - change ifalias of a device
1041 * @alias: name up to IFALIASZ
1042 * @len: limit of bytes to copy from info
1044 * Set ifalias for a device,
1046 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1050 if (len
>= IFALIASZ
)
1055 kfree(dev
->ifalias
);
1056 dev
->ifalias
= NULL
;
1061 dev
->ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1065 strlcpy(dev
->ifalias
, alias
, len
+1);
1071 * netdev_features_change - device changes features
1072 * @dev: device to cause notification
1074 * Called to indicate a device has changed features.
1076 void netdev_features_change(struct net_device
*dev
)
1078 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1080 EXPORT_SYMBOL(netdev_features_change
);
1083 * netdev_state_change - device changes state
1084 * @dev: device to cause notification
1086 * Called to indicate a device has changed state. This function calls
1087 * the notifier chains for netdev_chain and sends a NEWLINK message
1088 * to the routing socket.
1090 void netdev_state_change(struct net_device
*dev
)
1092 if (dev
->flags
& IFF_UP
) {
1093 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1094 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1097 EXPORT_SYMBOL(netdev_state_change
);
1099 int netdev_bonding_change(struct net_device
*dev
, unsigned long event
)
1101 return call_netdevice_notifiers(event
, dev
);
1103 EXPORT_SYMBOL(netdev_bonding_change
);
1106 * dev_load - load a network module
1107 * @net: the applicable net namespace
1108 * @name: name of interface
1110 * If a network interface is not present and the process has suitable
1111 * privileges this function loads the module. If module loading is not
1112 * available in this kernel then it becomes a nop.
1115 void dev_load(struct net
*net
, const char *name
)
1117 struct net_device
*dev
;
1120 dev
= dev_get_by_name_rcu(net
, name
);
1123 if (!dev
&& capable(CAP_NET_ADMIN
))
1124 request_module("%s", name
);
1126 EXPORT_SYMBOL(dev_load
);
1128 static int __dev_open(struct net_device
*dev
)
1130 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1136 * Is it even present?
1138 if (!netif_device_present(dev
))
1141 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1142 ret
= notifier_to_errno(ret
);
1147 * Call device private open method
1149 set_bit(__LINK_STATE_START
, &dev
->state
);
1151 if (ops
->ndo_validate_addr
)
1152 ret
= ops
->ndo_validate_addr(dev
);
1154 if (!ret
&& ops
->ndo_open
)
1155 ret
= ops
->ndo_open(dev
);
1158 * If it went open OK then:
1162 clear_bit(__LINK_STATE_START
, &dev
->state
);
1167 dev
->flags
|= IFF_UP
;
1172 net_dmaengine_get();
1175 * Initialize multicasting status
1177 dev_set_rx_mode(dev
);
1180 * Wakeup transmit queue engine
1189 * dev_open - prepare an interface for use.
1190 * @dev: device to open
1192 * Takes a device from down to up state. The device's private open
1193 * function is invoked and then the multicast lists are loaded. Finally
1194 * the device is moved into the up state and a %NETDEV_UP message is
1195 * sent to the netdev notifier chain.
1197 * Calling this function on an active interface is a nop. On a failure
1198 * a negative errno code is returned.
1200 int dev_open(struct net_device
*dev
)
1207 if (dev
->flags
& IFF_UP
)
1213 ret
= __dev_open(dev
);
1218 * ... and announce new interface.
1220 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1221 call_netdevice_notifiers(NETDEV_UP
, dev
);
1225 EXPORT_SYMBOL(dev_open
);
1227 static int __dev_close(struct net_device
*dev
)
1229 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1235 * Tell people we are going down, so that they can
1236 * prepare to death, when device is still operating.
1238 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1240 clear_bit(__LINK_STATE_START
, &dev
->state
);
1242 /* Synchronize to scheduled poll. We cannot touch poll list,
1243 * it can be even on different cpu. So just clear netif_running().
1245 * dev->stop() will invoke napi_disable() on all of it's
1246 * napi_struct instances on this device.
1248 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1250 dev_deactivate(dev
);
1253 * Call the device specific close. This cannot fail.
1254 * Only if device is UP
1256 * We allow it to be called even after a DETACH hot-plug
1263 * Device is now down.
1266 dev
->flags
&= ~IFF_UP
;
1271 net_dmaengine_put();
1277 * dev_close - shutdown an interface.
1278 * @dev: device to shutdown
1280 * This function moves an active device into down state. A
1281 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1282 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1285 int dev_close(struct net_device
*dev
)
1287 if (!(dev
->flags
& IFF_UP
))
1293 * Tell people we are down
1295 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1296 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1300 EXPORT_SYMBOL(dev_close
);
1304 * dev_disable_lro - disable Large Receive Offload on a device
1307 * Disable Large Receive Offload (LRO) on a net device. Must be
1308 * called under RTNL. This is needed if received packets may be
1309 * forwarded to another interface.
1311 void dev_disable_lro(struct net_device
*dev
)
1313 if (dev
->ethtool_ops
&& dev
->ethtool_ops
->get_flags
&&
1314 dev
->ethtool_ops
->set_flags
) {
1315 u32 flags
= dev
->ethtool_ops
->get_flags(dev
);
1316 if (flags
& ETH_FLAG_LRO
) {
1317 flags
&= ~ETH_FLAG_LRO
;
1318 dev
->ethtool_ops
->set_flags(dev
, flags
);
1321 WARN_ON(dev
->features
& NETIF_F_LRO
);
1323 EXPORT_SYMBOL(dev_disable_lro
);
1326 static int dev_boot_phase
= 1;
1329 * Device change register/unregister. These are not inline or static
1330 * as we export them to the world.
1334 * register_netdevice_notifier - register a network notifier block
1337 * Register a notifier to be called when network device events occur.
1338 * The notifier passed is linked into the kernel structures and must
1339 * not be reused until it has been unregistered. A negative errno code
1340 * is returned on a failure.
1342 * When registered all registration and up events are replayed
1343 * to the new notifier to allow device to have a race free
1344 * view of the network device list.
1347 int register_netdevice_notifier(struct notifier_block
*nb
)
1349 struct net_device
*dev
;
1350 struct net_device
*last
;
1355 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1361 for_each_netdev(net
, dev
) {
1362 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1363 err
= notifier_to_errno(err
);
1367 if (!(dev
->flags
& IFF_UP
))
1370 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1381 for_each_netdev(net
, dev
) {
1385 if (dev
->flags
& IFF_UP
) {
1386 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1387 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1389 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1390 nb
->notifier_call(nb
, NETDEV_UNREGISTER_BATCH
, dev
);
1394 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1397 EXPORT_SYMBOL(register_netdevice_notifier
);
1400 * unregister_netdevice_notifier - unregister a network notifier block
1403 * Unregister a notifier previously registered by
1404 * register_netdevice_notifier(). The notifier is unlinked into the
1405 * kernel structures and may then be reused. A negative errno code
1406 * is returned on a failure.
1409 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1414 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1418 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1421 * call_netdevice_notifiers - call all network notifier blocks
1422 * @val: value passed unmodified to notifier function
1423 * @dev: net_device pointer passed unmodified to notifier function
1425 * Call all network notifier blocks. Parameters and return value
1426 * are as for raw_notifier_call_chain().
1429 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1432 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1435 /* When > 0 there are consumers of rx skb time stamps */
1436 static atomic_t netstamp_needed
= ATOMIC_INIT(0);
1438 void net_enable_timestamp(void)
1440 atomic_inc(&netstamp_needed
);
1442 EXPORT_SYMBOL(net_enable_timestamp
);
1444 void net_disable_timestamp(void)
1446 atomic_dec(&netstamp_needed
);
1448 EXPORT_SYMBOL(net_disable_timestamp
);
1450 static inline void net_timestamp_set(struct sk_buff
*skb
)
1452 if (atomic_read(&netstamp_needed
))
1453 __net_timestamp(skb
);
1455 skb
->tstamp
.tv64
= 0;
1458 static inline void net_timestamp_check(struct sk_buff
*skb
)
1460 if (!skb
->tstamp
.tv64
&& atomic_read(&netstamp_needed
))
1461 __net_timestamp(skb
);
1465 * dev_forward_skb - loopback an skb to another netif
1467 * @dev: destination network device
1468 * @skb: buffer to forward
1471 * NET_RX_SUCCESS (no congestion)
1472 * NET_RX_DROP (packet was dropped, but freed)
1474 * dev_forward_skb can be used for injecting an skb from the
1475 * start_xmit function of one device into the receive queue
1476 * of another device.
1478 * The receiving device may be in another namespace, so
1479 * we have to clear all information in the skb that could
1480 * impact namespace isolation.
1482 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1487 if (!(dev
->flags
& IFF_UP
) ||
1488 (skb
->len
> (dev
->mtu
+ dev
->hard_header_len
))) {
1492 skb_set_dev(skb
, dev
);
1493 skb
->tstamp
.tv64
= 0;
1494 skb
->pkt_type
= PACKET_HOST
;
1495 skb
->protocol
= eth_type_trans(skb
, dev
);
1496 return netif_rx(skb
);
1498 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1501 * Support routine. Sends outgoing frames to any network
1502 * taps currently in use.
1505 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1507 struct packet_type
*ptype
;
1509 #ifdef CONFIG_NET_CLS_ACT
1510 if (!(skb
->tstamp
.tv64
&& (G_TC_FROM(skb
->tc_verd
) & AT_INGRESS
)))
1511 net_timestamp_set(skb
);
1513 net_timestamp_set(skb
);
1517 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1518 /* Never send packets back to the socket
1519 * they originated from - MvS (miquels@drinkel.ow.org)
1521 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1522 (ptype
->af_packet_priv
== NULL
||
1523 (struct sock
*)ptype
->af_packet_priv
!= skb
->sk
)) {
1524 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
1528 /* skb->nh should be correctly
1529 set by sender, so that the second statement is
1530 just protection against buggy protocols.
1532 skb_reset_mac_header(skb2
);
1534 if (skb_network_header(skb2
) < skb2
->data
||
1535 skb2
->network_header
> skb2
->tail
) {
1536 if (net_ratelimit())
1537 printk(KERN_CRIT
"protocol %04x is "
1539 ntohs(skb2
->protocol
),
1541 skb_reset_network_header(skb2
);
1544 skb2
->transport_header
= skb2
->network_header
;
1545 skb2
->pkt_type
= PACKET_OUTGOING
;
1546 ptype
->func(skb2
, skb
->dev
, ptype
, skb
->dev
);
1553 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1554 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1556 void netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
1558 unsigned int real_num
= dev
->real_num_tx_queues
;
1560 if (unlikely(txq
> dev
->num_tx_queues
))
1562 else if (txq
> real_num
)
1563 dev
->real_num_tx_queues
= txq
;
1564 else if (txq
< real_num
) {
1565 dev
->real_num_tx_queues
= txq
;
1566 qdisc_reset_all_tx_gt(dev
, txq
);
1569 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
1571 static inline void __netif_reschedule(struct Qdisc
*q
)
1573 struct softnet_data
*sd
;
1574 unsigned long flags
;
1576 local_irq_save(flags
);
1577 sd
= &__get_cpu_var(softnet_data
);
1578 q
->next_sched
= NULL
;
1579 *sd
->output_queue_tailp
= q
;
1580 sd
->output_queue_tailp
= &q
->next_sched
;
1581 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1582 local_irq_restore(flags
);
1585 void __netif_schedule(struct Qdisc
*q
)
1587 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
1588 __netif_reschedule(q
);
1590 EXPORT_SYMBOL(__netif_schedule
);
1592 void dev_kfree_skb_irq(struct sk_buff
*skb
)
1594 if (atomic_dec_and_test(&skb
->users
)) {
1595 struct softnet_data
*sd
;
1596 unsigned long flags
;
1598 local_irq_save(flags
);
1599 sd
= &__get_cpu_var(softnet_data
);
1600 skb
->next
= sd
->completion_queue
;
1601 sd
->completion_queue
= skb
;
1602 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1603 local_irq_restore(flags
);
1606 EXPORT_SYMBOL(dev_kfree_skb_irq
);
1608 void dev_kfree_skb_any(struct sk_buff
*skb
)
1610 if (in_irq() || irqs_disabled())
1611 dev_kfree_skb_irq(skb
);
1615 EXPORT_SYMBOL(dev_kfree_skb_any
);
1619 * netif_device_detach - mark device as removed
1620 * @dev: network device
1622 * Mark device as removed from system and therefore no longer available.
1624 void netif_device_detach(struct net_device
*dev
)
1626 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1627 netif_running(dev
)) {
1628 netif_tx_stop_all_queues(dev
);
1631 EXPORT_SYMBOL(netif_device_detach
);
1634 * netif_device_attach - mark device as attached
1635 * @dev: network device
1637 * Mark device as attached from system and restart if needed.
1639 void netif_device_attach(struct net_device
*dev
)
1641 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1642 netif_running(dev
)) {
1643 netif_tx_wake_all_queues(dev
);
1644 __netdev_watchdog_up(dev
);
1647 EXPORT_SYMBOL(netif_device_attach
);
1649 static bool can_checksum_protocol(unsigned long features
, __be16 protocol
)
1651 return ((features
& NETIF_F_GEN_CSUM
) ||
1652 ((features
& NETIF_F_IP_CSUM
) &&
1653 protocol
== htons(ETH_P_IP
)) ||
1654 ((features
& NETIF_F_IPV6_CSUM
) &&
1655 protocol
== htons(ETH_P_IPV6
)) ||
1656 ((features
& NETIF_F_FCOE_CRC
) &&
1657 protocol
== htons(ETH_P_FCOE
)));
1660 static bool dev_can_checksum(struct net_device
*dev
, struct sk_buff
*skb
)
1662 if (can_checksum_protocol(dev
->features
, skb
->protocol
))
1665 if (skb
->protocol
== htons(ETH_P_8021Q
)) {
1666 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
1667 if (can_checksum_protocol(dev
->features
& dev
->vlan_features
,
1668 veh
->h_vlan_encapsulated_proto
))
1676 * skb_dev_set -- assign a new device to a buffer
1677 * @skb: buffer for the new device
1678 * @dev: network device
1680 * If an skb is owned by a device already, we have to reset
1681 * all data private to the namespace a device belongs to
1682 * before assigning it a new device.
1684 #ifdef CONFIG_NET_NS
1685 void skb_set_dev(struct sk_buff
*skb
, struct net_device
*dev
)
1688 if (skb
->dev
&& !net_eq(dev_net(skb
->dev
), dev_net(dev
))) {
1691 skb_init_secmark(skb
);
1695 skb
->ipvs_property
= 0;
1696 #ifdef CONFIG_NET_SCHED
1702 EXPORT_SYMBOL(skb_set_dev
);
1703 #endif /* CONFIG_NET_NS */
1706 * Invalidate hardware checksum when packet is to be mangled, and
1707 * complete checksum manually on outgoing path.
1709 int skb_checksum_help(struct sk_buff
*skb
)
1712 int ret
= 0, offset
;
1714 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1715 goto out_set_summed
;
1717 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
1718 /* Let GSO fix up the checksum. */
1719 goto out_set_summed
;
1722 offset
= skb
->csum_start
- skb_headroom(skb
);
1723 BUG_ON(offset
>= skb_headlen(skb
));
1724 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1726 offset
+= skb
->csum_offset
;
1727 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
1729 if (skb_cloned(skb
) &&
1730 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
1731 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
1736 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1738 skb
->ip_summed
= CHECKSUM_NONE
;
1742 EXPORT_SYMBOL(skb_checksum_help
);
1745 * skb_gso_segment - Perform segmentation on skb.
1746 * @skb: buffer to segment
1747 * @features: features for the output path (see dev->features)
1749 * This function segments the given skb and returns a list of segments.
1751 * It may return NULL if the skb requires no segmentation. This is
1752 * only possible when GSO is used for verifying header integrity.
1754 struct sk_buff
*skb_gso_segment(struct sk_buff
*skb
, int features
)
1756 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
1757 struct packet_type
*ptype
;
1758 __be16 type
= skb
->protocol
;
1761 skb_reset_mac_header(skb
);
1762 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
1763 __skb_pull(skb
, skb
->mac_len
);
1765 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
1766 struct net_device
*dev
= skb
->dev
;
1767 struct ethtool_drvinfo info
= {};
1769 if (dev
&& dev
->ethtool_ops
&& dev
->ethtool_ops
->get_drvinfo
)
1770 dev
->ethtool_ops
->get_drvinfo(dev
, &info
);
1772 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1774 info
.driver
, dev
? dev
->features
: 0L,
1775 skb
->sk
? skb
->sk
->sk_route_caps
: 0L,
1776 skb
->len
, skb
->data_len
, skb
->ip_summed
);
1778 if (skb_header_cloned(skb
) &&
1779 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
1780 return ERR_PTR(err
);
1784 list_for_each_entry_rcu(ptype
,
1785 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
1786 if (ptype
->type
== type
&& !ptype
->dev
&& ptype
->gso_segment
) {
1787 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
1788 err
= ptype
->gso_send_check(skb
);
1789 segs
= ERR_PTR(err
);
1790 if (err
|| skb_gso_ok(skb
, features
))
1792 __skb_push(skb
, (skb
->data
-
1793 skb_network_header(skb
)));
1795 segs
= ptype
->gso_segment(skb
, features
);
1801 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1805 EXPORT_SYMBOL(skb_gso_segment
);
1807 /* Take action when hardware reception checksum errors are detected. */
1809 void netdev_rx_csum_fault(struct net_device
*dev
)
1811 if (net_ratelimit()) {
1812 printk(KERN_ERR
"%s: hw csum failure.\n",
1813 dev
? dev
->name
: "<unknown>");
1817 EXPORT_SYMBOL(netdev_rx_csum_fault
);
1820 /* Actually, we should eliminate this check as soon as we know, that:
1821 * 1. IOMMU is present and allows to map all the memory.
1822 * 2. No high memory really exists on this machine.
1825 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
1827 #ifdef CONFIG_HIGHMEM
1829 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
1830 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++)
1831 if (PageHighMem(skb_shinfo(skb
)->frags
[i
].page
))
1835 if (PCI_DMA_BUS_IS_PHYS
) {
1836 struct device
*pdev
= dev
->dev
.parent
;
1840 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
1841 dma_addr_t addr
= page_to_phys(skb_shinfo(skb
)->frags
[i
].page
);
1842 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
1851 void (*destructor
)(struct sk_buff
*skb
);
1854 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1856 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
1858 struct dev_gso_cb
*cb
;
1861 struct sk_buff
*nskb
= skb
->next
;
1863 skb
->next
= nskb
->next
;
1866 } while (skb
->next
);
1868 cb
= DEV_GSO_CB(skb
);
1870 cb
->destructor(skb
);
1874 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1875 * @skb: buffer to segment
1877 * This function segments the given skb and stores the list of segments
1880 static int dev_gso_segment(struct sk_buff
*skb
)
1882 struct net_device
*dev
= skb
->dev
;
1883 struct sk_buff
*segs
;
1884 int features
= dev
->features
& ~(illegal_highdma(dev
, skb
) ?
1887 segs
= skb_gso_segment(skb
, features
);
1889 /* Verifying header integrity only. */
1894 return PTR_ERR(segs
);
1897 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
1898 skb
->destructor
= dev_gso_skb_destructor
;
1904 * Try to orphan skb early, right before transmission by the device.
1905 * We cannot orphan skb if tx timestamp is requested or the sk-reference
1906 * is needed on driver level for other reasons, e.g. see net/can/raw.c
1908 static inline void skb_orphan_try(struct sk_buff
*skb
)
1910 struct sock
*sk
= skb
->sk
;
1912 if (sk
&& !skb_shinfo(skb
)->tx_flags
) {
1913 /* skb_tx_hash() wont be able to get sk.
1914 * We copy sk_hash into skb->rxhash
1917 skb
->rxhash
= sk
->sk_hash
;
1923 * Returns true if either:
1924 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
1925 * 2. skb is fragmented and the device does not support SG, or if
1926 * at least one of fragments is in highmem and device does not
1927 * support DMA from it.
1929 static inline int skb_needs_linearize(struct sk_buff
*skb
,
1930 struct net_device
*dev
)
1932 return skb_is_nonlinear(skb
) &&
1933 ((skb_has_frag_list(skb
) && !(dev
->features
& NETIF_F_FRAGLIST
)) ||
1934 (skb_shinfo(skb
)->nr_frags
&& (!(dev
->features
& NETIF_F_SG
) ||
1935 illegal_highdma(dev
, skb
))));
1938 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
1939 struct netdev_queue
*txq
)
1941 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1942 int rc
= NETDEV_TX_OK
;
1944 if (likely(!skb
->next
)) {
1945 if (!list_empty(&ptype_all
))
1946 dev_queue_xmit_nit(skb
, dev
);
1949 * If device doesnt need skb->dst, release it right now while
1950 * its hot in this cpu cache
1952 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
1955 skb_orphan_try(skb
);
1957 if (netif_needs_gso(dev
, skb
)) {
1958 if (unlikely(dev_gso_segment(skb
)))
1963 if (skb_needs_linearize(skb
, dev
) &&
1964 __skb_linearize(skb
))
1967 /* If packet is not checksummed and device does not
1968 * support checksumming for this protocol, complete
1969 * checksumming here.
1971 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
1972 skb_set_transport_header(skb
, skb
->csum_start
-
1974 if (!dev_can_checksum(dev
, skb
) &&
1975 skb_checksum_help(skb
))
1980 rc
= ops
->ndo_start_xmit(skb
, dev
);
1981 if (rc
== NETDEV_TX_OK
)
1982 txq_trans_update(txq
);
1988 struct sk_buff
*nskb
= skb
->next
;
1990 skb
->next
= nskb
->next
;
1994 * If device doesnt need nskb->dst, release it right now while
1995 * its hot in this cpu cache
1997 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2000 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2001 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2002 if (rc
& ~NETDEV_TX_MASK
)
2003 goto out_kfree_gso_skb
;
2004 nskb
->next
= skb
->next
;
2008 txq_trans_update(txq
);
2009 if (unlikely(netif_tx_queue_stopped(txq
) && skb
->next
))
2010 return NETDEV_TX_BUSY
;
2011 } while (skb
->next
);
2014 if (likely(skb
->next
== NULL
))
2015 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2021 static u32 hashrnd __read_mostly
;
2023 u16
skb_tx_hash(const struct net_device
*dev
, const struct sk_buff
*skb
)
2027 if (skb_rx_queue_recorded(skb
)) {
2028 hash
= skb_get_rx_queue(skb
);
2029 while (unlikely(hash
>= dev
->real_num_tx_queues
))
2030 hash
-= dev
->real_num_tx_queues
;
2034 if (skb
->sk
&& skb
->sk
->sk_hash
)
2035 hash
= skb
->sk
->sk_hash
;
2037 hash
= (__force u16
) skb
->protocol
^ skb
->rxhash
;
2038 hash
= jhash_1word(hash
, hashrnd
);
2040 return (u16
) (((u64
) hash
* dev
->real_num_tx_queues
) >> 32);
2042 EXPORT_SYMBOL(skb_tx_hash
);
2044 static inline u16
dev_cap_txqueue(struct net_device
*dev
, u16 queue_index
)
2046 if (unlikely(queue_index
>= dev
->real_num_tx_queues
)) {
2047 if (net_ratelimit()) {
2048 pr_warning("%s selects TX queue %d, but "
2049 "real number of TX queues is %d\n",
2050 dev
->name
, queue_index
, dev
->real_num_tx_queues
);
2057 static struct netdev_queue
*dev_pick_tx(struct net_device
*dev
,
2058 struct sk_buff
*skb
)
2061 struct sock
*sk
= skb
->sk
;
2063 queue_index
= sk_tx_queue_get(sk
);
2064 if (queue_index
< 0) {
2065 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2067 if (ops
->ndo_select_queue
) {
2068 queue_index
= ops
->ndo_select_queue(dev
, skb
);
2069 queue_index
= dev_cap_txqueue(dev
, queue_index
);
2072 if (dev
->real_num_tx_queues
> 1)
2073 queue_index
= skb_tx_hash(dev
, skb
);
2076 struct dst_entry
*dst
= rcu_dereference_check(sk
->sk_dst_cache
, 1);
2078 if (dst
&& skb_dst(skb
) == dst
)
2079 sk_tx_queue_set(sk
, queue_index
);
2084 skb_set_queue_mapping(skb
, queue_index
);
2085 return netdev_get_tx_queue(dev
, queue_index
);
2088 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2089 struct net_device
*dev
,
2090 struct netdev_queue
*txq
)
2092 spinlock_t
*root_lock
= qdisc_lock(q
);
2093 bool contended
= qdisc_is_running(q
);
2097 * Heuristic to force contended enqueues to serialize on a
2098 * separate lock before trying to get qdisc main lock.
2099 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2100 * and dequeue packets faster.
2102 if (unlikely(contended
))
2103 spin_lock(&q
->busylock
);
2105 spin_lock(root_lock
);
2106 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2109 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2110 qdisc_run_begin(q
)) {
2112 * This is a work-conserving queue; there are no old skbs
2113 * waiting to be sent out; and the qdisc is not running -
2114 * xmit the skb directly.
2116 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2118 __qdisc_update_bstats(q
, skb
->len
);
2119 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2120 if (unlikely(contended
)) {
2121 spin_unlock(&q
->busylock
);
2128 rc
= NET_XMIT_SUCCESS
;
2131 rc
= qdisc_enqueue_root(skb
, q
);
2132 if (qdisc_run_begin(q
)) {
2133 if (unlikely(contended
)) {
2134 spin_unlock(&q
->busylock
);
2140 spin_unlock(root_lock
);
2141 if (unlikely(contended
))
2142 spin_unlock(&q
->busylock
);
2147 * dev_queue_xmit - transmit a buffer
2148 * @skb: buffer to transmit
2150 * Queue a buffer for transmission to a network device. The caller must
2151 * have set the device and priority and built the buffer before calling
2152 * this function. The function can be called from an interrupt.
2154 * A negative errno code is returned on a failure. A success does not
2155 * guarantee the frame will be transmitted as it may be dropped due
2156 * to congestion or traffic shaping.
2158 * -----------------------------------------------------------------------------------
2159 * I notice this method can also return errors from the queue disciplines,
2160 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2163 * Regardless of the return value, the skb is consumed, so it is currently
2164 * difficult to retry a send to this method. (You can bump the ref count
2165 * before sending to hold a reference for retry if you are careful.)
2167 * When calling this method, interrupts MUST be enabled. This is because
2168 * the BH enable code must have IRQs enabled so that it will not deadlock.
2171 int dev_queue_xmit(struct sk_buff
*skb
)
2173 struct net_device
*dev
= skb
->dev
;
2174 struct netdev_queue
*txq
;
2178 /* Disable soft irqs for various locks below. Also
2179 * stops preemption for RCU.
2183 txq
= dev_pick_tx(dev
, skb
);
2184 q
= rcu_dereference_bh(txq
->qdisc
);
2186 #ifdef CONFIG_NET_CLS_ACT
2187 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2190 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2194 /* The device has no queue. Common case for software devices:
2195 loopback, all the sorts of tunnels...
2197 Really, it is unlikely that netif_tx_lock protection is necessary
2198 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2200 However, it is possible, that they rely on protection
2203 Check this and shot the lock. It is not prone from deadlocks.
2204 Either shot noqueue qdisc, it is even simpler 8)
2206 if (dev
->flags
& IFF_UP
) {
2207 int cpu
= smp_processor_id(); /* ok because BHs are off */
2209 if (txq
->xmit_lock_owner
!= cpu
) {
2211 HARD_TX_LOCK(dev
, txq
, cpu
);
2213 if (!netif_tx_queue_stopped(txq
)) {
2214 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2215 if (dev_xmit_complete(rc
)) {
2216 HARD_TX_UNLOCK(dev
, txq
);
2220 HARD_TX_UNLOCK(dev
, txq
);
2221 if (net_ratelimit())
2222 printk(KERN_CRIT
"Virtual device %s asks to "
2223 "queue packet!\n", dev
->name
);
2225 /* Recursion is detected! It is possible,
2227 if (net_ratelimit())
2228 printk(KERN_CRIT
"Dead loop on virtual device "
2229 "%s, fix it urgently!\n", dev
->name
);
2234 rcu_read_unlock_bh();
2239 rcu_read_unlock_bh();
2242 EXPORT_SYMBOL(dev_queue_xmit
);
2245 /*=======================================================================
2247 =======================================================================*/
2249 int netdev_max_backlog __read_mostly
= 1000;
2250 int netdev_tstamp_prequeue __read_mostly
= 1;
2251 int netdev_budget __read_mostly
= 300;
2252 int weight_p __read_mostly
= 64; /* old backlog weight */
2254 /* Called with irq disabled */
2255 static inline void ____napi_schedule(struct softnet_data
*sd
,
2256 struct napi_struct
*napi
)
2258 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2259 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2263 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2264 * and src/dst port numbers. Returns a non-zero hash number on success
2267 __u32
__skb_get_rxhash(struct sk_buff
*skb
)
2269 int nhoff
, hash
= 0, poff
;
2270 struct ipv6hdr
*ip6
;
2273 u32 addr1
, addr2
, ihl
;
2279 nhoff
= skb_network_offset(skb
);
2281 switch (skb
->protocol
) {
2282 case __constant_htons(ETH_P_IP
):
2283 if (!pskb_may_pull(skb
, sizeof(*ip
) + nhoff
))
2286 ip
= (struct iphdr
*) (skb
->data
+ nhoff
);
2287 if (ip
->frag_off
& htons(IP_MF
| IP_OFFSET
))
2290 ip_proto
= ip
->protocol
;
2291 addr1
= (__force u32
) ip
->saddr
;
2292 addr2
= (__force u32
) ip
->daddr
;
2295 case __constant_htons(ETH_P_IPV6
):
2296 if (!pskb_may_pull(skb
, sizeof(*ip6
) + nhoff
))
2299 ip6
= (struct ipv6hdr
*) (skb
->data
+ nhoff
);
2300 ip_proto
= ip6
->nexthdr
;
2301 addr1
= (__force u32
) ip6
->saddr
.s6_addr32
[3];
2302 addr2
= (__force u32
) ip6
->daddr
.s6_addr32
[3];
2310 poff
= proto_ports_offset(ip_proto
);
2312 nhoff
+= ihl
* 4 + poff
;
2313 if (pskb_may_pull(skb
, nhoff
+ 4)) {
2314 ports
.v32
= * (__force u32
*) (skb
->data
+ nhoff
);
2315 if (ports
.v16
[1] < ports
.v16
[0])
2316 swap(ports
.v16
[0], ports
.v16
[1]);
2320 /* get a consistent hash (same value on both flow directions) */
2324 hash
= jhash_3words(addr1
, addr2
, ports
.v32
, hashrnd
);
2331 EXPORT_SYMBOL(__skb_get_rxhash
);
2335 /* One global table that all flow-based protocols share. */
2336 struct rps_sock_flow_table
*rps_sock_flow_table __read_mostly
;
2337 EXPORT_SYMBOL(rps_sock_flow_table
);
2340 * get_rps_cpu is called from netif_receive_skb and returns the target
2341 * CPU from the RPS map of the receiving queue for a given skb.
2342 * rcu_read_lock must be held on entry.
2344 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2345 struct rps_dev_flow
**rflowp
)
2347 struct netdev_rx_queue
*rxqueue
;
2348 struct rps_map
*map
;
2349 struct rps_dev_flow_table
*flow_table
;
2350 struct rps_sock_flow_table
*sock_flow_table
;
2354 if (skb_rx_queue_recorded(skb
)) {
2355 u16 index
= skb_get_rx_queue(skb
);
2356 if (unlikely(index
>= dev
->num_rx_queues
)) {
2357 WARN_ONCE(dev
->num_rx_queues
> 1, "%s received packet "
2358 "on queue %u, but number of RX queues is %u\n",
2359 dev
->name
, index
, dev
->num_rx_queues
);
2362 rxqueue
= dev
->_rx
+ index
;
2366 if (!rxqueue
->rps_map
&& !rxqueue
->rps_flow_table
)
2369 skb_reset_network_header(skb
);
2370 if (!skb_get_rxhash(skb
))
2373 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2374 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
2375 if (flow_table
&& sock_flow_table
) {
2377 struct rps_dev_flow
*rflow
;
2379 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
2382 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
2383 sock_flow_table
->mask
];
2386 * If the desired CPU (where last recvmsg was done) is
2387 * different from current CPU (one in the rx-queue flow
2388 * table entry), switch if one of the following holds:
2389 * - Current CPU is unset (equal to RPS_NO_CPU).
2390 * - Current CPU is offline.
2391 * - The current CPU's queue tail has advanced beyond the
2392 * last packet that was enqueued using this table entry.
2393 * This guarantees that all previous packets for the flow
2394 * have been dequeued, thus preserving in order delivery.
2396 if (unlikely(tcpu
!= next_cpu
) &&
2397 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
2398 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
2399 rflow
->last_qtail
)) >= 0)) {
2400 tcpu
= rflow
->cpu
= next_cpu
;
2401 if (tcpu
!= RPS_NO_CPU
)
2402 rflow
->last_qtail
= per_cpu(softnet_data
,
2403 tcpu
).input_queue_head
;
2405 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
2412 map
= rcu_dereference(rxqueue
->rps_map
);
2414 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
2416 if (cpu_online(tcpu
)) {
2426 /* Called from hardirq (IPI) context */
2427 static void rps_trigger_softirq(void *data
)
2429 struct softnet_data
*sd
= data
;
2431 ____napi_schedule(sd
, &sd
->backlog
);
2435 #endif /* CONFIG_RPS */
2438 * Check if this softnet_data structure is another cpu one
2439 * If yes, queue it to our IPI list and return 1
2442 static int rps_ipi_queued(struct softnet_data
*sd
)
2445 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
2448 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
2449 mysd
->rps_ipi_list
= sd
;
2451 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2454 #endif /* CONFIG_RPS */
2459 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2460 * queue (may be a remote CPU queue).
2462 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
2463 unsigned int *qtail
)
2465 struct softnet_data
*sd
;
2466 unsigned long flags
;
2468 sd
= &per_cpu(softnet_data
, cpu
);
2470 local_irq_save(flags
);
2473 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
2474 if (skb_queue_len(&sd
->input_pkt_queue
)) {
2476 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
2477 input_queue_tail_incr_save(sd
, qtail
);
2479 local_irq_restore(flags
);
2480 return NET_RX_SUCCESS
;
2483 /* Schedule NAPI for backlog device
2484 * We can use non atomic operation since we own the queue lock
2486 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
2487 if (!rps_ipi_queued(sd
))
2488 ____napi_schedule(sd
, &sd
->backlog
);
2496 local_irq_restore(flags
);
2503 * netif_rx - post buffer to the network code
2504 * @skb: buffer to post
2506 * This function receives a packet from a device driver and queues it for
2507 * the upper (protocol) levels to process. It always succeeds. The buffer
2508 * may be dropped during processing for congestion control or by the
2512 * NET_RX_SUCCESS (no congestion)
2513 * NET_RX_DROP (packet was dropped)
2517 int netif_rx(struct sk_buff
*skb
)
2521 /* if netpoll wants it, pretend we never saw it */
2522 if (netpoll_rx(skb
))
2525 if (netdev_tstamp_prequeue
)
2526 net_timestamp_check(skb
);
2530 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
2536 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
2538 cpu
= smp_processor_id();
2540 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
2548 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
2554 EXPORT_SYMBOL(netif_rx
);
2556 int netif_rx_ni(struct sk_buff
*skb
)
2561 err
= netif_rx(skb
);
2562 if (local_softirq_pending())
2568 EXPORT_SYMBOL(netif_rx_ni
);
2570 static void net_tx_action(struct softirq_action
*h
)
2572 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
2574 if (sd
->completion_queue
) {
2575 struct sk_buff
*clist
;
2577 local_irq_disable();
2578 clist
= sd
->completion_queue
;
2579 sd
->completion_queue
= NULL
;
2583 struct sk_buff
*skb
= clist
;
2584 clist
= clist
->next
;
2586 WARN_ON(atomic_read(&skb
->users
));
2591 if (sd
->output_queue
) {
2594 local_irq_disable();
2595 head
= sd
->output_queue
;
2596 sd
->output_queue
= NULL
;
2597 sd
->output_queue_tailp
= &sd
->output_queue
;
2601 struct Qdisc
*q
= head
;
2602 spinlock_t
*root_lock
;
2604 head
= head
->next_sched
;
2606 root_lock
= qdisc_lock(q
);
2607 if (spin_trylock(root_lock
)) {
2608 smp_mb__before_clear_bit();
2609 clear_bit(__QDISC_STATE_SCHED
,
2612 spin_unlock(root_lock
);
2614 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
2616 __netif_reschedule(q
);
2618 smp_mb__before_clear_bit();
2619 clear_bit(__QDISC_STATE_SCHED
,
2627 static inline int deliver_skb(struct sk_buff
*skb
,
2628 struct packet_type
*pt_prev
,
2629 struct net_device
*orig_dev
)
2631 atomic_inc(&skb
->users
);
2632 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
2635 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2636 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2637 /* This hook is defined here for ATM LANE */
2638 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
2639 unsigned char *addr
) __read_mostly
;
2640 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
2643 #ifdef CONFIG_NET_CLS_ACT
2644 /* TODO: Maybe we should just force sch_ingress to be compiled in
2645 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2646 * a compare and 2 stores extra right now if we dont have it on
2647 * but have CONFIG_NET_CLS_ACT
2648 * NOTE: This doesnt stop any functionality; if you dont have
2649 * the ingress scheduler, you just cant add policies on ingress.
2652 static int ing_filter(struct sk_buff
*skb
)
2654 struct net_device
*dev
= skb
->dev
;
2655 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
2656 struct netdev_queue
*rxq
;
2657 int result
= TC_ACT_OK
;
2660 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
2661 if (net_ratelimit())
2662 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
2663 skb
->skb_iif
, dev
->ifindex
);
2667 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
2668 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
2670 rxq
= &dev
->rx_queue
;
2673 if (q
!= &noop_qdisc
) {
2674 spin_lock(qdisc_lock(q
));
2675 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
2676 result
= qdisc_enqueue_root(skb
, q
);
2677 spin_unlock(qdisc_lock(q
));
2683 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
2684 struct packet_type
**pt_prev
,
2685 int *ret
, struct net_device
*orig_dev
)
2687 if (skb
->dev
->rx_queue
.qdisc
== &noop_qdisc
)
2691 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
2695 switch (ing_filter(skb
)) {
2709 * netif_nit_deliver - deliver received packets to network taps
2712 * This function is used to deliver incoming packets to network
2713 * taps. It should be used when the normal netif_receive_skb path
2714 * is bypassed, for example because of VLAN acceleration.
2716 void netif_nit_deliver(struct sk_buff
*skb
)
2718 struct packet_type
*ptype
;
2720 if (list_empty(&ptype_all
))
2723 skb_reset_network_header(skb
);
2724 skb_reset_transport_header(skb
);
2725 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
2728 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
2729 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
)
2730 deliver_skb(skb
, ptype
, skb
->dev
);
2736 * netdev_rx_handler_register - register receive handler
2737 * @dev: device to register a handler for
2738 * @rx_handler: receive handler to register
2739 * @rx_handler_data: data pointer that is used by rx handler
2741 * Register a receive hander for a device. This handler will then be
2742 * called from __netif_receive_skb. A negative errno code is returned
2745 * The caller must hold the rtnl_mutex.
2747 int netdev_rx_handler_register(struct net_device
*dev
,
2748 rx_handler_func_t
*rx_handler
,
2749 void *rx_handler_data
)
2753 if (dev
->rx_handler
)
2756 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
2757 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
2761 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
2764 * netdev_rx_handler_unregister - unregister receive handler
2765 * @dev: device to unregister a handler from
2767 * Unregister a receive hander from a device.
2769 * The caller must hold the rtnl_mutex.
2771 void netdev_rx_handler_unregister(struct net_device
*dev
)
2775 rcu_assign_pointer(dev
->rx_handler
, NULL
);
2776 rcu_assign_pointer(dev
->rx_handler_data
, NULL
);
2778 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
2780 static inline void skb_bond_set_mac_by_master(struct sk_buff
*skb
,
2781 struct net_device
*master
)
2783 if (skb
->pkt_type
== PACKET_HOST
) {
2784 u16
*dest
= (u16
*) eth_hdr(skb
)->h_dest
;
2786 memcpy(dest
, master
->dev_addr
, ETH_ALEN
);
2790 /* On bonding slaves other than the currently active slave, suppress
2791 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2792 * ARP on active-backup slaves with arp_validate enabled.
2794 int __skb_bond_should_drop(struct sk_buff
*skb
, struct net_device
*master
)
2796 struct net_device
*dev
= skb
->dev
;
2798 if (master
->priv_flags
& IFF_MASTER_ARPMON
)
2799 dev
->last_rx
= jiffies
;
2801 if ((master
->priv_flags
& IFF_MASTER_ALB
) &&
2802 (master
->priv_flags
& IFF_BRIDGE_PORT
)) {
2803 /* Do address unmangle. The local destination address
2804 * will be always the one master has. Provides the right
2805 * functionality in a bridge.
2807 skb_bond_set_mac_by_master(skb
, master
);
2810 if (dev
->priv_flags
& IFF_SLAVE_INACTIVE
) {
2811 if ((dev
->priv_flags
& IFF_SLAVE_NEEDARP
) &&
2812 skb
->protocol
== __cpu_to_be16(ETH_P_ARP
))
2815 if (master
->priv_flags
& IFF_MASTER_ALB
) {
2816 if (skb
->pkt_type
!= PACKET_BROADCAST
&&
2817 skb
->pkt_type
!= PACKET_MULTICAST
)
2820 if (master
->priv_flags
& IFF_MASTER_8023AD
&&
2821 skb
->protocol
== __cpu_to_be16(ETH_P_SLOW
))
2828 EXPORT_SYMBOL(__skb_bond_should_drop
);
2830 static int __netif_receive_skb(struct sk_buff
*skb
)
2832 struct packet_type
*ptype
, *pt_prev
;
2833 rx_handler_func_t
*rx_handler
;
2834 struct net_device
*orig_dev
;
2835 struct net_device
*master
;
2836 struct net_device
*null_or_orig
;
2837 struct net_device
*orig_or_bond
;
2838 int ret
= NET_RX_DROP
;
2841 if (!netdev_tstamp_prequeue
)
2842 net_timestamp_check(skb
);
2844 if (vlan_tx_tag_present(skb
))
2845 vlan_hwaccel_do_receive(skb
);
2847 /* if we've gotten here through NAPI, check netpoll */
2848 if (netpoll_receive_skb(skb
))
2852 skb
->skb_iif
= skb
->dev
->ifindex
;
2855 * bonding note: skbs received on inactive slaves should only
2856 * be delivered to pkt handlers that are exact matches. Also
2857 * the deliver_no_wcard flag will be set. If packet handlers
2858 * are sensitive to duplicate packets these skbs will need to
2859 * be dropped at the handler. The vlan accel path may have
2860 * already set the deliver_no_wcard flag.
2862 null_or_orig
= NULL
;
2863 orig_dev
= skb
->dev
;
2864 master
= ACCESS_ONCE(orig_dev
->master
);
2865 if (skb
->deliver_no_wcard
)
2866 null_or_orig
= orig_dev
;
2868 if (skb_bond_should_drop(skb
, master
)) {
2869 skb
->deliver_no_wcard
= 1;
2870 null_or_orig
= orig_dev
; /* deliver only exact match */
2875 __this_cpu_inc(softnet_data
.processed
);
2876 skb_reset_network_header(skb
);
2877 skb_reset_transport_header(skb
);
2878 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
2884 #ifdef CONFIG_NET_CLS_ACT
2885 if (skb
->tc_verd
& TC_NCLS
) {
2886 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
2891 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
2892 if (ptype
->dev
== null_or_orig
|| ptype
->dev
== skb
->dev
||
2893 ptype
->dev
== orig_dev
) {
2895 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
2900 #ifdef CONFIG_NET_CLS_ACT
2901 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
2907 /* Handle special case of bridge or macvlan */
2908 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
2911 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
2914 skb
= rx_handler(skb
);
2920 * Make sure frames received on VLAN interfaces stacked on
2921 * bonding interfaces still make their way to any base bonding
2922 * device that may have registered for a specific ptype. The
2923 * handler may have to adjust skb->dev and orig_dev.
2925 orig_or_bond
= orig_dev
;
2926 if ((skb
->dev
->priv_flags
& IFF_802_1Q_VLAN
) &&
2927 (vlan_dev_real_dev(skb
->dev
)->priv_flags
& IFF_BONDING
)) {
2928 orig_or_bond
= vlan_dev_real_dev(skb
->dev
);
2931 type
= skb
->protocol
;
2932 list_for_each_entry_rcu(ptype
,
2933 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
2934 if (ptype
->type
== type
&& (ptype
->dev
== null_or_orig
||
2935 ptype
->dev
== skb
->dev
|| ptype
->dev
== orig_dev
||
2936 ptype
->dev
== orig_or_bond
)) {
2938 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
2944 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
2947 /* Jamal, now you will not able to escape explaining
2948 * me how you were going to use this. :-)
2959 * netif_receive_skb - process receive buffer from network
2960 * @skb: buffer to process
2962 * netif_receive_skb() is the main receive data processing function.
2963 * It always succeeds. The buffer may be dropped during processing
2964 * for congestion control or by the protocol layers.
2966 * This function may only be called from softirq context and interrupts
2967 * should be enabled.
2969 * Return values (usually ignored):
2970 * NET_RX_SUCCESS: no congestion
2971 * NET_RX_DROP: packet was dropped
2973 int netif_receive_skb(struct sk_buff
*skb
)
2975 if (netdev_tstamp_prequeue
)
2976 net_timestamp_check(skb
);
2978 if (skb_defer_rx_timestamp(skb
))
2979 return NET_RX_SUCCESS
;
2983 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
2988 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
2991 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
2995 ret
= __netif_receive_skb(skb
);
3001 return __netif_receive_skb(skb
);
3004 EXPORT_SYMBOL(netif_receive_skb
);
3006 /* Network device is going away, flush any packets still pending
3007 * Called with irqs disabled.
3009 static void flush_backlog(void *arg
)
3011 struct net_device
*dev
= arg
;
3012 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3013 struct sk_buff
*skb
, *tmp
;
3016 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3017 if (skb
->dev
== dev
) {
3018 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3020 input_queue_head_incr(sd
);
3025 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3026 if (skb
->dev
== dev
) {
3027 __skb_unlink(skb
, &sd
->process_queue
);
3029 input_queue_head_incr(sd
);
3034 static int napi_gro_complete(struct sk_buff
*skb
)
3036 struct packet_type
*ptype
;
3037 __be16 type
= skb
->protocol
;
3038 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3041 if (NAPI_GRO_CB(skb
)->count
== 1) {
3042 skb_shinfo(skb
)->gso_size
= 0;
3047 list_for_each_entry_rcu(ptype
, head
, list
) {
3048 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_complete
)
3051 err
= ptype
->gro_complete(skb
);
3057 WARN_ON(&ptype
->list
== head
);
3059 return NET_RX_SUCCESS
;
3063 return netif_receive_skb(skb
);
3066 static void napi_gro_flush(struct napi_struct
*napi
)
3068 struct sk_buff
*skb
, *next
;
3070 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3073 napi_gro_complete(skb
);
3076 napi
->gro_count
= 0;
3077 napi
->gro_list
= NULL
;
3080 enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3082 struct sk_buff
**pp
= NULL
;
3083 struct packet_type
*ptype
;
3084 __be16 type
= skb
->protocol
;
3085 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3088 enum gro_result ret
;
3090 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3093 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3097 list_for_each_entry_rcu(ptype
, head
, list
) {
3098 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_receive
)
3101 skb_set_network_header(skb
, skb_gro_offset(skb
));
3102 mac_len
= skb
->network_header
- skb
->mac_header
;
3103 skb
->mac_len
= mac_len
;
3104 NAPI_GRO_CB(skb
)->same_flow
= 0;
3105 NAPI_GRO_CB(skb
)->flush
= 0;
3106 NAPI_GRO_CB(skb
)->free
= 0;
3108 pp
= ptype
->gro_receive(&napi
->gro_list
, skb
);
3113 if (&ptype
->list
== head
)
3116 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3117 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3120 struct sk_buff
*nskb
= *pp
;
3124 napi_gro_complete(nskb
);
3131 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3135 NAPI_GRO_CB(skb
)->count
= 1;
3136 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3137 skb
->next
= napi
->gro_list
;
3138 napi
->gro_list
= skb
;
3142 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3143 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3145 BUG_ON(skb
->end
- skb
->tail
< grow
);
3147 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3150 skb
->data_len
-= grow
;
3152 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3153 skb_shinfo(skb
)->frags
[0].size
-= grow
;
3155 if (unlikely(!skb_shinfo(skb
)->frags
[0].size
)) {
3156 put_page(skb_shinfo(skb
)->frags
[0].page
);
3157 memmove(skb_shinfo(skb
)->frags
,
3158 skb_shinfo(skb
)->frags
+ 1,
3159 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3170 EXPORT_SYMBOL(dev_gro_receive
);
3173 __napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3177 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3178 NAPI_GRO_CB(p
)->same_flow
=
3179 (p
->dev
== skb
->dev
) &&
3180 !compare_ether_header(skb_mac_header(p
),
3181 skb_gro_mac_header(skb
));
3182 NAPI_GRO_CB(p
)->flush
= 0;
3185 return dev_gro_receive(napi
, skb
);
3188 gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3192 if (netif_receive_skb(skb
))
3197 case GRO_MERGED_FREE
:
3208 EXPORT_SYMBOL(napi_skb_finish
);
3210 void skb_gro_reset_offset(struct sk_buff
*skb
)
3212 NAPI_GRO_CB(skb
)->data_offset
= 0;
3213 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3214 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3216 if (skb
->mac_header
== skb
->tail
&&
3217 !PageHighMem(skb_shinfo(skb
)->frags
[0].page
)) {
3218 NAPI_GRO_CB(skb
)->frag0
=
3219 page_address(skb_shinfo(skb
)->frags
[0].page
) +
3220 skb_shinfo(skb
)->frags
[0].page_offset
;
3221 NAPI_GRO_CB(skb
)->frag0_len
= skb_shinfo(skb
)->frags
[0].size
;
3224 EXPORT_SYMBOL(skb_gro_reset_offset
);
3226 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3228 skb_gro_reset_offset(skb
);
3230 return napi_skb_finish(__napi_gro_receive(napi
, skb
), skb
);
3232 EXPORT_SYMBOL(napi_gro_receive
);
3234 void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3236 __skb_pull(skb
, skb_headlen(skb
));
3237 skb_reserve(skb
, NET_IP_ALIGN
- skb_headroom(skb
));
3241 EXPORT_SYMBOL(napi_reuse_skb
);
3243 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3245 struct sk_buff
*skb
= napi
->skb
;
3248 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3254 EXPORT_SYMBOL(napi_get_frags
);
3256 gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3262 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3264 if (ret
== GRO_HELD
)
3265 skb_gro_pull(skb
, -ETH_HLEN
);
3266 else if (netif_receive_skb(skb
))
3271 case GRO_MERGED_FREE
:
3272 napi_reuse_skb(napi
, skb
);
3281 EXPORT_SYMBOL(napi_frags_finish
);
3283 struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3285 struct sk_buff
*skb
= napi
->skb
;
3292 skb_reset_mac_header(skb
);
3293 skb_gro_reset_offset(skb
);
3295 off
= skb_gro_offset(skb
);
3296 hlen
= off
+ sizeof(*eth
);
3297 eth
= skb_gro_header_fast(skb
, off
);
3298 if (skb_gro_header_hard(skb
, hlen
)) {
3299 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3300 if (unlikely(!eth
)) {
3301 napi_reuse_skb(napi
, skb
);
3307 skb_gro_pull(skb
, sizeof(*eth
));
3310 * This works because the only protocols we care about don't require
3311 * special handling. We'll fix it up properly at the end.
3313 skb
->protocol
= eth
->h_proto
;
3318 EXPORT_SYMBOL(napi_frags_skb
);
3320 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
3322 struct sk_buff
*skb
= napi_frags_skb(napi
);
3327 return napi_frags_finish(napi
, skb
, __napi_gro_receive(napi
, skb
));
3329 EXPORT_SYMBOL(napi_gro_frags
);
3332 * net_rps_action sends any pending IPI's for rps.
3333 * Note: called with local irq disabled, but exits with local irq enabled.
3335 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
3338 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
3341 sd
->rps_ipi_list
= NULL
;
3345 /* Send pending IPI's to kick RPS processing on remote cpus. */
3347 struct softnet_data
*next
= remsd
->rps_ipi_next
;
3349 if (cpu_online(remsd
->cpu
))
3350 __smp_call_function_single(remsd
->cpu
,
3359 static int process_backlog(struct napi_struct
*napi
, int quota
)
3362 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
3365 /* Check if we have pending ipi, its better to send them now,
3366 * not waiting net_rx_action() end.
3368 if (sd
->rps_ipi_list
) {
3369 local_irq_disable();
3370 net_rps_action_and_irq_enable(sd
);
3373 napi
->weight
= weight_p
;
3374 local_irq_disable();
3375 while (work
< quota
) {
3376 struct sk_buff
*skb
;
3379 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
3381 __netif_receive_skb(skb
);
3382 local_irq_disable();
3383 input_queue_head_incr(sd
);
3384 if (++work
>= quota
) {
3391 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3393 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
3394 &sd
->process_queue
);
3396 if (qlen
< quota
- work
) {
3398 * Inline a custom version of __napi_complete().
3399 * only current cpu owns and manipulates this napi,
3400 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3401 * we can use a plain write instead of clear_bit(),
3402 * and we dont need an smp_mb() memory barrier.
3404 list_del(&napi
->poll_list
);
3407 quota
= work
+ qlen
;
3417 * __napi_schedule - schedule for receive
3418 * @n: entry to schedule
3420 * The entry's receive function will be scheduled to run
3422 void __napi_schedule(struct napi_struct
*n
)
3424 unsigned long flags
;
3426 local_irq_save(flags
);
3427 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
3428 local_irq_restore(flags
);
3430 EXPORT_SYMBOL(__napi_schedule
);
3432 void __napi_complete(struct napi_struct
*n
)
3434 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
3435 BUG_ON(n
->gro_list
);
3437 list_del(&n
->poll_list
);
3438 smp_mb__before_clear_bit();
3439 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
3441 EXPORT_SYMBOL(__napi_complete
);
3443 void napi_complete(struct napi_struct
*n
)
3445 unsigned long flags
;
3448 * don't let napi dequeue from the cpu poll list
3449 * just in case its running on a different cpu
3451 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
3455 local_irq_save(flags
);
3457 local_irq_restore(flags
);
3459 EXPORT_SYMBOL(napi_complete
);
3461 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
3462 int (*poll
)(struct napi_struct
*, int), int weight
)
3464 INIT_LIST_HEAD(&napi
->poll_list
);
3465 napi
->gro_count
= 0;
3466 napi
->gro_list
= NULL
;
3469 napi
->weight
= weight
;
3470 list_add(&napi
->dev_list
, &dev
->napi_list
);
3472 #ifdef CONFIG_NETPOLL
3473 spin_lock_init(&napi
->poll_lock
);
3474 napi
->poll_owner
= -1;
3476 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
3478 EXPORT_SYMBOL(netif_napi_add
);
3480 void netif_napi_del(struct napi_struct
*napi
)
3482 struct sk_buff
*skb
, *next
;
3484 list_del_init(&napi
->dev_list
);
3485 napi_free_frags(napi
);
3487 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3493 napi
->gro_list
= NULL
;
3494 napi
->gro_count
= 0;
3496 EXPORT_SYMBOL(netif_napi_del
);
3498 static void net_rx_action(struct softirq_action
*h
)
3500 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3501 unsigned long time_limit
= jiffies
+ 2;
3502 int budget
= netdev_budget
;
3505 local_irq_disable();
3507 while (!list_empty(&sd
->poll_list
)) {
3508 struct napi_struct
*n
;
3511 /* If softirq window is exhuasted then punt.
3512 * Allow this to run for 2 jiffies since which will allow
3513 * an average latency of 1.5/HZ.
3515 if (unlikely(budget
<= 0 || time_after(jiffies
, time_limit
)))
3520 /* Even though interrupts have been re-enabled, this
3521 * access is safe because interrupts can only add new
3522 * entries to the tail of this list, and only ->poll()
3523 * calls can remove this head entry from the list.
3525 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
3527 have
= netpoll_poll_lock(n
);
3531 /* This NAPI_STATE_SCHED test is for avoiding a race
3532 * with netpoll's poll_napi(). Only the entity which
3533 * obtains the lock and sees NAPI_STATE_SCHED set will
3534 * actually make the ->poll() call. Therefore we avoid
3535 * accidently calling ->poll() when NAPI is not scheduled.
3538 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
3539 work
= n
->poll(n
, weight
);
3543 WARN_ON_ONCE(work
> weight
);
3547 local_irq_disable();
3549 /* Drivers must not modify the NAPI state if they
3550 * consume the entire weight. In such cases this code
3551 * still "owns" the NAPI instance and therefore can
3552 * move the instance around on the list at-will.
3554 if (unlikely(work
== weight
)) {
3555 if (unlikely(napi_disable_pending(n
))) {
3558 local_irq_disable();
3560 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
3563 netpoll_poll_unlock(have
);
3566 net_rps_action_and_irq_enable(sd
);
3568 #ifdef CONFIG_NET_DMA
3570 * There may not be any more sk_buffs coming right now, so push
3571 * any pending DMA copies to hardware
3573 dma_issue_pending_all();
3580 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3584 static gifconf_func_t
*gifconf_list
[NPROTO
];
3587 * register_gifconf - register a SIOCGIF handler
3588 * @family: Address family
3589 * @gifconf: Function handler
3591 * Register protocol dependent address dumping routines. The handler
3592 * that is passed must not be freed or reused until it has been replaced
3593 * by another handler.
3595 int register_gifconf(unsigned int family
, gifconf_func_t
*gifconf
)
3597 if (family
>= NPROTO
)
3599 gifconf_list
[family
] = gifconf
;
3602 EXPORT_SYMBOL(register_gifconf
);
3606 * Map an interface index to its name (SIOCGIFNAME)
3610 * We need this ioctl for efficient implementation of the
3611 * if_indextoname() function required by the IPv6 API. Without
3612 * it, we would have to search all the interfaces to find a
3616 static int dev_ifname(struct net
*net
, struct ifreq __user
*arg
)
3618 struct net_device
*dev
;
3622 * Fetch the caller's info block.
3625 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
3629 dev
= dev_get_by_index_rcu(net
, ifr
.ifr_ifindex
);
3635 strcpy(ifr
.ifr_name
, dev
->name
);
3638 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
3644 * Perform a SIOCGIFCONF call. This structure will change
3645 * size eventually, and there is nothing I can do about it.
3646 * Thus we will need a 'compatibility mode'.
3649 static int dev_ifconf(struct net
*net
, char __user
*arg
)
3652 struct net_device
*dev
;
3659 * Fetch the caller's info block.
3662 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
3669 * Loop over the interfaces, and write an info block for each.
3673 for_each_netdev(net
, dev
) {
3674 for (i
= 0; i
< NPROTO
; i
++) {
3675 if (gifconf_list
[i
]) {
3678 done
= gifconf_list
[i
](dev
, NULL
, 0);
3680 done
= gifconf_list
[i
](dev
, pos
+ total
,
3690 * All done. Write the updated control block back to the caller.
3692 ifc
.ifc_len
= total
;
3695 * Both BSD and Solaris return 0 here, so we do too.
3697 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
3700 #ifdef CONFIG_PROC_FS
3702 * This is invoked by the /proc filesystem handler to display a device
3705 void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3708 struct net
*net
= seq_file_net(seq
);
3710 struct net_device
*dev
;
3714 return SEQ_START_TOKEN
;
3717 for_each_netdev_rcu(net
, dev
)
3724 void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3726 struct net_device
*dev
= (v
== SEQ_START_TOKEN
) ?
3727 first_net_device(seq_file_net(seq
)) :
3728 next_net_device((struct net_device
*)v
);
3731 return rcu_dereference(dev
);
3734 void dev_seq_stop(struct seq_file
*seq
, void *v
)
3740 static void dev_seq_printf_stats(struct seq_file
*seq
, struct net_device
*dev
)
3742 struct rtnl_link_stats64 temp
;
3743 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
3745 seq_printf(seq
, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
3746 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
3747 dev
->name
, stats
->rx_bytes
, stats
->rx_packets
,
3749 stats
->rx_dropped
+ stats
->rx_missed_errors
,
3750 stats
->rx_fifo_errors
,
3751 stats
->rx_length_errors
+ stats
->rx_over_errors
+
3752 stats
->rx_crc_errors
+ stats
->rx_frame_errors
,
3753 stats
->rx_compressed
, stats
->multicast
,
3754 stats
->tx_bytes
, stats
->tx_packets
,
3755 stats
->tx_errors
, stats
->tx_dropped
,
3756 stats
->tx_fifo_errors
, stats
->collisions
,
3757 stats
->tx_carrier_errors
+
3758 stats
->tx_aborted_errors
+
3759 stats
->tx_window_errors
+
3760 stats
->tx_heartbeat_errors
,
3761 stats
->tx_compressed
);
3765 * Called from the PROCfs module. This now uses the new arbitrary sized
3766 * /proc/net interface to create /proc/net/dev
3768 static int dev_seq_show(struct seq_file
*seq
, void *v
)
3770 if (v
== SEQ_START_TOKEN
)
3771 seq_puts(seq
, "Inter-| Receive "
3773 " face |bytes packets errs drop fifo frame "
3774 "compressed multicast|bytes packets errs "
3775 "drop fifo colls carrier compressed\n");
3777 dev_seq_printf_stats(seq
, v
);
3781 static struct softnet_data
*softnet_get_online(loff_t
*pos
)
3783 struct softnet_data
*sd
= NULL
;
3785 while (*pos
< nr_cpu_ids
)
3786 if (cpu_online(*pos
)) {
3787 sd
= &per_cpu(softnet_data
, *pos
);
3794 static void *softnet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3796 return softnet_get_online(pos
);
3799 static void *softnet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3802 return softnet_get_online(pos
);
3805 static void softnet_seq_stop(struct seq_file
*seq
, void *v
)
3809 static int softnet_seq_show(struct seq_file
*seq
, void *v
)
3811 struct softnet_data
*sd
= v
;
3813 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3814 sd
->processed
, sd
->dropped
, sd
->time_squeeze
, 0,
3815 0, 0, 0, 0, /* was fastroute */
3816 sd
->cpu_collision
, sd
->received_rps
);
3820 static const struct seq_operations dev_seq_ops
= {
3821 .start
= dev_seq_start
,
3822 .next
= dev_seq_next
,
3823 .stop
= dev_seq_stop
,
3824 .show
= dev_seq_show
,
3827 static int dev_seq_open(struct inode
*inode
, struct file
*file
)
3829 return seq_open_net(inode
, file
, &dev_seq_ops
,
3830 sizeof(struct seq_net_private
));
3833 static const struct file_operations dev_seq_fops
= {
3834 .owner
= THIS_MODULE
,
3835 .open
= dev_seq_open
,
3837 .llseek
= seq_lseek
,
3838 .release
= seq_release_net
,
3841 static const struct seq_operations softnet_seq_ops
= {
3842 .start
= softnet_seq_start
,
3843 .next
= softnet_seq_next
,
3844 .stop
= softnet_seq_stop
,
3845 .show
= softnet_seq_show
,
3848 static int softnet_seq_open(struct inode
*inode
, struct file
*file
)
3850 return seq_open(file
, &softnet_seq_ops
);
3853 static const struct file_operations softnet_seq_fops
= {
3854 .owner
= THIS_MODULE
,
3855 .open
= softnet_seq_open
,
3857 .llseek
= seq_lseek
,
3858 .release
= seq_release
,
3861 static void *ptype_get_idx(loff_t pos
)
3863 struct packet_type
*pt
= NULL
;
3867 list_for_each_entry_rcu(pt
, &ptype_all
, list
) {
3873 for (t
= 0; t
< PTYPE_HASH_SIZE
; t
++) {
3874 list_for_each_entry_rcu(pt
, &ptype_base
[t
], list
) {
3883 static void *ptype_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3887 return *pos
? ptype_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
3890 static void *ptype_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3892 struct packet_type
*pt
;
3893 struct list_head
*nxt
;
3897 if (v
== SEQ_START_TOKEN
)
3898 return ptype_get_idx(0);
3901 nxt
= pt
->list
.next
;
3902 if (pt
->type
== htons(ETH_P_ALL
)) {
3903 if (nxt
!= &ptype_all
)
3906 nxt
= ptype_base
[0].next
;
3908 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
3910 while (nxt
== &ptype_base
[hash
]) {
3911 if (++hash
>= PTYPE_HASH_SIZE
)
3913 nxt
= ptype_base
[hash
].next
;
3916 return list_entry(nxt
, struct packet_type
, list
);
3919 static void ptype_seq_stop(struct seq_file
*seq
, void *v
)
3925 static int ptype_seq_show(struct seq_file
*seq
, void *v
)
3927 struct packet_type
*pt
= v
;
3929 if (v
== SEQ_START_TOKEN
)
3930 seq_puts(seq
, "Type Device Function\n");
3931 else if (pt
->dev
== NULL
|| dev_net(pt
->dev
) == seq_file_net(seq
)) {
3932 if (pt
->type
== htons(ETH_P_ALL
))
3933 seq_puts(seq
, "ALL ");
3935 seq_printf(seq
, "%04x", ntohs(pt
->type
));
3937 seq_printf(seq
, " %-8s %pF\n",
3938 pt
->dev
? pt
->dev
->name
: "", pt
->func
);
3944 static const struct seq_operations ptype_seq_ops
= {
3945 .start
= ptype_seq_start
,
3946 .next
= ptype_seq_next
,
3947 .stop
= ptype_seq_stop
,
3948 .show
= ptype_seq_show
,
3951 static int ptype_seq_open(struct inode
*inode
, struct file
*file
)
3953 return seq_open_net(inode
, file
, &ptype_seq_ops
,
3954 sizeof(struct seq_net_private
));
3957 static const struct file_operations ptype_seq_fops
= {
3958 .owner
= THIS_MODULE
,
3959 .open
= ptype_seq_open
,
3961 .llseek
= seq_lseek
,
3962 .release
= seq_release_net
,
3966 static int __net_init
dev_proc_net_init(struct net
*net
)
3970 if (!proc_net_fops_create(net
, "dev", S_IRUGO
, &dev_seq_fops
))
3972 if (!proc_net_fops_create(net
, "softnet_stat", S_IRUGO
, &softnet_seq_fops
))
3974 if (!proc_net_fops_create(net
, "ptype", S_IRUGO
, &ptype_seq_fops
))
3977 if (wext_proc_init(net
))
3983 proc_net_remove(net
, "ptype");
3985 proc_net_remove(net
, "softnet_stat");
3987 proc_net_remove(net
, "dev");
3991 static void __net_exit
dev_proc_net_exit(struct net
*net
)
3993 wext_proc_exit(net
);
3995 proc_net_remove(net
, "ptype");
3996 proc_net_remove(net
, "softnet_stat");
3997 proc_net_remove(net
, "dev");
4000 static struct pernet_operations __net_initdata dev_proc_ops
= {
4001 .init
= dev_proc_net_init
,
4002 .exit
= dev_proc_net_exit
,
4005 static int __init
dev_proc_init(void)
4007 return register_pernet_subsys(&dev_proc_ops
);
4010 #define dev_proc_init() 0
4011 #endif /* CONFIG_PROC_FS */
4015 * netdev_set_master - set up master/slave pair
4016 * @slave: slave device
4017 * @master: new master device
4019 * Changes the master device of the slave. Pass %NULL to break the
4020 * bonding. The caller must hold the RTNL semaphore. On a failure
4021 * a negative errno code is returned. On success the reference counts
4022 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
4023 * function returns zero.
4025 int netdev_set_master(struct net_device
*slave
, struct net_device
*master
)
4027 struct net_device
*old
= slave
->master
;
4037 slave
->master
= master
;
4044 slave
->flags
|= IFF_SLAVE
;
4046 slave
->flags
&= ~IFF_SLAVE
;
4048 rtmsg_ifinfo(RTM_NEWLINK
, slave
, IFF_SLAVE
);
4051 EXPORT_SYMBOL(netdev_set_master
);
4053 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4055 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4057 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
4058 ops
->ndo_change_rx_flags(dev
, flags
);
4061 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4063 unsigned short old_flags
= dev
->flags
;
4069 dev
->flags
|= IFF_PROMISC
;
4070 dev
->promiscuity
+= inc
;
4071 if (dev
->promiscuity
== 0) {
4074 * If inc causes overflow, untouch promisc and return error.
4077 dev
->flags
&= ~IFF_PROMISC
;
4079 dev
->promiscuity
-= inc
;
4080 printk(KERN_WARNING
"%s: promiscuity touches roof, "
4081 "set promiscuity failed, promiscuity feature "
4082 "of device might be broken.\n", dev
->name
);
4086 if (dev
->flags
!= old_flags
) {
4087 printk(KERN_INFO
"device %s %s promiscuous mode\n",
4088 dev
->name
, (dev
->flags
& IFF_PROMISC
) ? "entered" :
4090 if (audit_enabled
) {
4091 current_uid_gid(&uid
, &gid
);
4092 audit_log(current
->audit_context
, GFP_ATOMIC
,
4093 AUDIT_ANOM_PROMISCUOUS
,
4094 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4095 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4096 (old_flags
& IFF_PROMISC
),
4097 audit_get_loginuid(current
),
4099 audit_get_sessionid(current
));
4102 dev_change_rx_flags(dev
, IFF_PROMISC
);
4108 * dev_set_promiscuity - update promiscuity count on a device
4112 * Add or remove promiscuity from a device. While the count in the device
4113 * remains above zero the interface remains promiscuous. Once it hits zero
4114 * the device reverts back to normal filtering operation. A negative inc
4115 * value is used to drop promiscuity on the device.
4116 * Return 0 if successful or a negative errno code on error.
4118 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4120 unsigned short old_flags
= dev
->flags
;
4123 err
= __dev_set_promiscuity(dev
, inc
);
4126 if (dev
->flags
!= old_flags
)
4127 dev_set_rx_mode(dev
);
4130 EXPORT_SYMBOL(dev_set_promiscuity
);
4133 * dev_set_allmulti - update allmulti count on a device
4137 * Add or remove reception of all multicast frames to a device. While the
4138 * count in the device remains above zero the interface remains listening
4139 * to all interfaces. Once it hits zero the device reverts back to normal
4140 * filtering operation. A negative @inc value is used to drop the counter
4141 * when releasing a resource needing all multicasts.
4142 * Return 0 if successful or a negative errno code on error.
4145 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4147 unsigned short old_flags
= dev
->flags
;
4151 dev
->flags
|= IFF_ALLMULTI
;
4152 dev
->allmulti
+= inc
;
4153 if (dev
->allmulti
== 0) {
4156 * If inc causes overflow, untouch allmulti and return error.
4159 dev
->flags
&= ~IFF_ALLMULTI
;
4161 dev
->allmulti
-= inc
;
4162 printk(KERN_WARNING
"%s: allmulti touches roof, "
4163 "set allmulti failed, allmulti feature of "
4164 "device might be broken.\n", dev
->name
);
4168 if (dev
->flags
^ old_flags
) {
4169 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4170 dev_set_rx_mode(dev
);
4174 EXPORT_SYMBOL(dev_set_allmulti
);
4177 * Upload unicast and multicast address lists to device and
4178 * configure RX filtering. When the device doesn't support unicast
4179 * filtering it is put in promiscuous mode while unicast addresses
4182 void __dev_set_rx_mode(struct net_device
*dev
)
4184 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4186 /* dev_open will call this function so the list will stay sane. */
4187 if (!(dev
->flags
&IFF_UP
))
4190 if (!netif_device_present(dev
))
4193 if (ops
->ndo_set_rx_mode
)
4194 ops
->ndo_set_rx_mode(dev
);
4196 /* Unicast addresses changes may only happen under the rtnl,
4197 * therefore calling __dev_set_promiscuity here is safe.
4199 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4200 __dev_set_promiscuity(dev
, 1);
4201 dev
->uc_promisc
= 1;
4202 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4203 __dev_set_promiscuity(dev
, -1);
4204 dev
->uc_promisc
= 0;
4207 if (ops
->ndo_set_multicast_list
)
4208 ops
->ndo_set_multicast_list(dev
);
4212 void dev_set_rx_mode(struct net_device
*dev
)
4214 netif_addr_lock_bh(dev
);
4215 __dev_set_rx_mode(dev
);
4216 netif_addr_unlock_bh(dev
);
4220 * dev_get_flags - get flags reported to userspace
4223 * Get the combination of flag bits exported through APIs to userspace.
4225 unsigned dev_get_flags(const struct net_device
*dev
)
4229 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4234 (dev
->gflags
& (IFF_PROMISC
|
4237 if (netif_running(dev
)) {
4238 if (netif_oper_up(dev
))
4239 flags
|= IFF_RUNNING
;
4240 if (netif_carrier_ok(dev
))
4241 flags
|= IFF_LOWER_UP
;
4242 if (netif_dormant(dev
))
4243 flags
|= IFF_DORMANT
;
4248 EXPORT_SYMBOL(dev_get_flags
);
4250 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4252 int old_flags
= dev
->flags
;
4258 * Set the flags on our device.
4261 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4262 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4264 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4268 * Load in the correct multicast list now the flags have changed.
4271 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4272 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4274 dev_set_rx_mode(dev
);
4277 * Have we downed the interface. We handle IFF_UP ourselves
4278 * according to user attempts to set it, rather than blindly
4283 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4284 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4287 dev_set_rx_mode(dev
);
4290 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4291 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4293 dev
->gflags
^= IFF_PROMISC
;
4294 dev_set_promiscuity(dev
, inc
);
4297 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4298 is important. Some (broken) drivers set IFF_PROMISC, when
4299 IFF_ALLMULTI is requested not asking us and not reporting.
4301 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4302 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4304 dev
->gflags
^= IFF_ALLMULTI
;
4305 dev_set_allmulti(dev
, inc
);
4311 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4313 unsigned int changes
= dev
->flags
^ old_flags
;
4315 if (changes
& IFF_UP
) {
4316 if (dev
->flags
& IFF_UP
)
4317 call_netdevice_notifiers(NETDEV_UP
, dev
);
4319 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4322 if (dev
->flags
& IFF_UP
&&
4323 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4324 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4328 * dev_change_flags - change device settings
4330 * @flags: device state flags
4332 * Change settings on device based state flags. The flags are
4333 * in the userspace exported format.
4335 int dev_change_flags(struct net_device
*dev
, unsigned flags
)
4338 int old_flags
= dev
->flags
;
4340 ret
= __dev_change_flags(dev
, flags
);
4344 changes
= old_flags
^ dev
->flags
;
4346 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4348 __dev_notify_flags(dev
, old_flags
);
4351 EXPORT_SYMBOL(dev_change_flags
);
4354 * dev_set_mtu - Change maximum transfer unit
4356 * @new_mtu: new transfer unit
4358 * Change the maximum transfer size of the network device.
4360 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4362 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4365 if (new_mtu
== dev
->mtu
)
4368 /* MTU must be positive. */
4372 if (!netif_device_present(dev
))
4376 if (ops
->ndo_change_mtu
)
4377 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4381 if (!err
&& dev
->flags
& IFF_UP
)
4382 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4385 EXPORT_SYMBOL(dev_set_mtu
);
4388 * dev_set_mac_address - Change Media Access Control Address
4392 * Change the hardware (MAC) address of the device
4394 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4396 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4399 if (!ops
->ndo_set_mac_address
)
4401 if (sa
->sa_family
!= dev
->type
)
4403 if (!netif_device_present(dev
))
4405 err
= ops
->ndo_set_mac_address(dev
, sa
);
4407 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4410 EXPORT_SYMBOL(dev_set_mac_address
);
4413 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4415 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4418 struct net_device
*dev
= dev_get_by_name_rcu(net
, ifr
->ifr_name
);
4424 case SIOCGIFFLAGS
: /* Get interface flags */
4425 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
4428 case SIOCGIFMETRIC
: /* Get the metric on the interface
4429 (currently unused) */
4430 ifr
->ifr_metric
= 0;
4433 case SIOCGIFMTU
: /* Get the MTU of a device */
4434 ifr
->ifr_mtu
= dev
->mtu
;
4439 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
4441 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
4442 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4443 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
4451 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
4452 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
4453 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
4454 ifr
->ifr_map
.irq
= dev
->irq
;
4455 ifr
->ifr_map
.dma
= dev
->dma
;
4456 ifr
->ifr_map
.port
= dev
->if_port
;
4460 ifr
->ifr_ifindex
= dev
->ifindex
;
4464 ifr
->ifr_qlen
= dev
->tx_queue_len
;
4468 /* dev_ioctl() should ensure this case
4480 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4482 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4485 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
4486 const struct net_device_ops
*ops
;
4491 ops
= dev
->netdev_ops
;
4494 case SIOCSIFFLAGS
: /* Set interface flags */
4495 return dev_change_flags(dev
, ifr
->ifr_flags
);
4497 case SIOCSIFMETRIC
: /* Set the metric on the interface
4498 (currently unused) */
4501 case SIOCSIFMTU
: /* Set the MTU of a device */
4502 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
4505 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
4507 case SIOCSIFHWBROADCAST
:
4508 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
4510 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
4511 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4512 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4516 if (ops
->ndo_set_config
) {
4517 if (!netif_device_present(dev
))
4519 return ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
4524 if ((!ops
->ndo_set_multicast_list
&& !ops
->ndo_set_rx_mode
) ||
4525 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4527 if (!netif_device_present(dev
))
4529 return dev_mc_add_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4532 if ((!ops
->ndo_set_multicast_list
&& !ops
->ndo_set_rx_mode
) ||
4533 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4535 if (!netif_device_present(dev
))
4537 return dev_mc_del_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4540 if (ifr
->ifr_qlen
< 0)
4542 dev
->tx_queue_len
= ifr
->ifr_qlen
;
4546 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
4547 return dev_change_name(dev
, ifr
->ifr_newname
);
4550 * Unknown or private ioctl
4553 if ((cmd
>= SIOCDEVPRIVATE
&&
4554 cmd
<= SIOCDEVPRIVATE
+ 15) ||
4555 cmd
== SIOCBONDENSLAVE
||
4556 cmd
== SIOCBONDRELEASE
||
4557 cmd
== SIOCBONDSETHWADDR
||
4558 cmd
== SIOCBONDSLAVEINFOQUERY
||
4559 cmd
== SIOCBONDINFOQUERY
||
4560 cmd
== SIOCBONDCHANGEACTIVE
||
4561 cmd
== SIOCGMIIPHY
||
4562 cmd
== SIOCGMIIREG
||
4563 cmd
== SIOCSMIIREG
||
4564 cmd
== SIOCBRADDIF
||
4565 cmd
== SIOCBRDELIF
||
4566 cmd
== SIOCSHWTSTAMP
||
4567 cmd
== SIOCWANDEV
) {
4569 if (ops
->ndo_do_ioctl
) {
4570 if (netif_device_present(dev
))
4571 err
= ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
4583 * This function handles all "interface"-type I/O control requests. The actual
4584 * 'doing' part of this is dev_ifsioc above.
4588 * dev_ioctl - network device ioctl
4589 * @net: the applicable net namespace
4590 * @cmd: command to issue
4591 * @arg: pointer to a struct ifreq in user space
4593 * Issue ioctl functions to devices. This is normally called by the
4594 * user space syscall interfaces but can sometimes be useful for
4595 * other purposes. The return value is the return from the syscall if
4596 * positive or a negative errno code on error.
4599 int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
4605 /* One special case: SIOCGIFCONF takes ifconf argument
4606 and requires shared lock, because it sleeps writing
4610 if (cmd
== SIOCGIFCONF
) {
4612 ret
= dev_ifconf(net
, (char __user
*) arg
);
4616 if (cmd
== SIOCGIFNAME
)
4617 return dev_ifname(net
, (struct ifreq __user
*)arg
);
4619 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
4622 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
4624 colon
= strchr(ifr
.ifr_name
, ':');
4629 * See which interface the caller is talking about.
4634 * These ioctl calls:
4635 * - can be done by all.
4636 * - atomic and do not require locking.
4647 dev_load(net
, ifr
.ifr_name
);
4649 ret
= dev_ifsioc_locked(net
, &ifr
, cmd
);
4654 if (copy_to_user(arg
, &ifr
,
4655 sizeof(struct ifreq
)))
4661 dev_load(net
, ifr
.ifr_name
);
4663 ret
= dev_ethtool(net
, &ifr
);
4668 if (copy_to_user(arg
, &ifr
,
4669 sizeof(struct ifreq
)))
4675 * These ioctl calls:
4676 * - require superuser power.
4677 * - require strict serialization.
4683 if (!capable(CAP_NET_ADMIN
))
4685 dev_load(net
, ifr
.ifr_name
);
4687 ret
= dev_ifsioc(net
, &ifr
, cmd
);
4692 if (copy_to_user(arg
, &ifr
,
4693 sizeof(struct ifreq
)))
4699 * These ioctl calls:
4700 * - require superuser power.
4701 * - require strict serialization.
4702 * - do not return a value
4712 case SIOCSIFHWBROADCAST
:
4715 case SIOCBONDENSLAVE
:
4716 case SIOCBONDRELEASE
:
4717 case SIOCBONDSETHWADDR
:
4718 case SIOCBONDCHANGEACTIVE
:
4722 if (!capable(CAP_NET_ADMIN
))
4725 case SIOCBONDSLAVEINFOQUERY
:
4726 case SIOCBONDINFOQUERY
:
4727 dev_load(net
, ifr
.ifr_name
);
4729 ret
= dev_ifsioc(net
, &ifr
, cmd
);
4734 /* Get the per device memory space. We can add this but
4735 * currently do not support it */
4737 /* Set the per device memory buffer space.
4738 * Not applicable in our case */
4743 * Unknown or private ioctl.
4746 if (cmd
== SIOCWANDEV
||
4747 (cmd
>= SIOCDEVPRIVATE
&&
4748 cmd
<= SIOCDEVPRIVATE
+ 15)) {
4749 dev_load(net
, ifr
.ifr_name
);
4751 ret
= dev_ifsioc(net
, &ifr
, cmd
);
4753 if (!ret
&& copy_to_user(arg
, &ifr
,
4754 sizeof(struct ifreq
)))
4758 /* Take care of Wireless Extensions */
4759 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
)
4760 return wext_handle_ioctl(net
, &ifr
, cmd
, arg
);
4767 * dev_new_index - allocate an ifindex
4768 * @net: the applicable net namespace
4770 * Returns a suitable unique value for a new device interface
4771 * number. The caller must hold the rtnl semaphore or the
4772 * dev_base_lock to be sure it remains unique.
4774 static int dev_new_index(struct net
*net
)
4780 if (!__dev_get_by_index(net
, ifindex
))
4785 /* Delayed registration/unregisteration */
4786 static LIST_HEAD(net_todo_list
);
4788 static void net_set_todo(struct net_device
*dev
)
4790 list_add_tail(&dev
->todo_list
, &net_todo_list
);
4793 static void rollback_registered_many(struct list_head
*head
)
4795 struct net_device
*dev
, *tmp
;
4797 BUG_ON(dev_boot_phase
);
4800 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
4801 /* Some devices call without registering
4802 * for initialization unwind. Remove those
4803 * devices and proceed with the remaining.
4805 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
4806 pr_debug("unregister_netdevice: device %s/%p never "
4807 "was registered\n", dev
->name
, dev
);
4810 list_del(&dev
->unreg_list
);
4814 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
4816 /* If device is running, close it first. */
4819 /* And unlink it from device chain. */
4820 unlist_netdevice(dev
);
4822 dev
->reg_state
= NETREG_UNREGISTERING
;
4827 list_for_each_entry(dev
, head
, unreg_list
) {
4828 /* Shutdown queueing discipline. */
4832 /* Notify protocols, that we are about to destroy
4833 this device. They should clean all the things.
4835 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
4837 if (!dev
->rtnl_link_ops
||
4838 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
4839 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
4842 * Flush the unicast and multicast chains
4847 if (dev
->netdev_ops
->ndo_uninit
)
4848 dev
->netdev_ops
->ndo_uninit(dev
);
4850 /* Notifier chain MUST detach us from master device. */
4851 WARN_ON(dev
->master
);
4853 /* Remove entries from kobject tree */
4854 netdev_unregister_kobject(dev
);
4857 /* Process any work delayed until the end of the batch */
4858 dev
= list_first_entry(head
, struct net_device
, unreg_list
);
4859 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
4863 list_for_each_entry(dev
, head
, unreg_list
)
4867 static void rollback_registered(struct net_device
*dev
)
4871 list_add(&dev
->unreg_list
, &single
);
4872 rollback_registered_many(&single
);
4875 static void __netdev_init_queue_locks_one(struct net_device
*dev
,
4876 struct netdev_queue
*dev_queue
,
4879 spin_lock_init(&dev_queue
->_xmit_lock
);
4880 netdev_set_xmit_lockdep_class(&dev_queue
->_xmit_lock
, dev
->type
);
4881 dev_queue
->xmit_lock_owner
= -1;
4884 static void netdev_init_queue_locks(struct net_device
*dev
)
4886 netdev_for_each_tx_queue(dev
, __netdev_init_queue_locks_one
, NULL
);
4887 __netdev_init_queue_locks_one(dev
, &dev
->rx_queue
, NULL
);
4890 unsigned long netdev_fix_features(unsigned long features
, const char *name
)
4892 /* Fix illegal SG+CSUM combinations. */
4893 if ((features
& NETIF_F_SG
) &&
4894 !(features
& NETIF_F_ALL_CSUM
)) {
4896 printk(KERN_NOTICE
"%s: Dropping NETIF_F_SG since no "
4897 "checksum feature.\n", name
);
4898 features
&= ~NETIF_F_SG
;
4901 /* TSO requires that SG is present as well. */
4902 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_SG
)) {
4904 printk(KERN_NOTICE
"%s: Dropping NETIF_F_TSO since no "
4905 "SG feature.\n", name
);
4906 features
&= ~NETIF_F_TSO
;
4909 if (features
& NETIF_F_UFO
) {
4910 if (!(features
& NETIF_F_GEN_CSUM
)) {
4912 printk(KERN_ERR
"%s: Dropping NETIF_F_UFO "
4913 "since no NETIF_F_HW_CSUM feature.\n",
4915 features
&= ~NETIF_F_UFO
;
4918 if (!(features
& NETIF_F_SG
)) {
4920 printk(KERN_ERR
"%s: Dropping NETIF_F_UFO "
4921 "since no NETIF_F_SG feature.\n", name
);
4922 features
&= ~NETIF_F_UFO
;
4928 EXPORT_SYMBOL(netdev_fix_features
);
4931 * netif_stacked_transfer_operstate - transfer operstate
4932 * @rootdev: the root or lower level device to transfer state from
4933 * @dev: the device to transfer operstate to
4935 * Transfer operational state from root to device. This is normally
4936 * called when a stacking relationship exists between the root
4937 * device and the device(a leaf device).
4939 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
4940 struct net_device
*dev
)
4942 if (rootdev
->operstate
== IF_OPER_DORMANT
)
4943 netif_dormant_on(dev
);
4945 netif_dormant_off(dev
);
4947 if (netif_carrier_ok(rootdev
)) {
4948 if (!netif_carrier_ok(dev
))
4949 netif_carrier_on(dev
);
4951 if (netif_carrier_ok(dev
))
4952 netif_carrier_off(dev
);
4955 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
4958 * register_netdevice - register a network device
4959 * @dev: device to register
4961 * Take a completed network device structure and add it to the kernel
4962 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4963 * chain. 0 is returned on success. A negative errno code is returned
4964 * on a failure to set up the device, or if the name is a duplicate.
4966 * Callers must hold the rtnl semaphore. You may want
4967 * register_netdev() instead of this.
4970 * The locking appears insufficient to guarantee two parallel registers
4971 * will not get the same name.
4974 int register_netdevice(struct net_device
*dev
)
4977 struct net
*net
= dev_net(dev
);
4979 BUG_ON(dev_boot_phase
);
4984 /* When net_device's are persistent, this will be fatal. */
4985 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
4988 spin_lock_init(&dev
->addr_list_lock
);
4989 netdev_set_addr_lockdep_class(dev
);
4990 netdev_init_queue_locks(dev
);
4995 if (!dev
->num_rx_queues
) {
4997 * Allocate a single RX queue if driver never called
5001 dev
->_rx
= kzalloc(sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5007 dev
->_rx
->first
= dev
->_rx
;
5008 atomic_set(&dev
->_rx
->count
, 1);
5009 dev
->num_rx_queues
= 1;
5012 /* Init, if this function is available */
5013 if (dev
->netdev_ops
->ndo_init
) {
5014 ret
= dev
->netdev_ops
->ndo_init(dev
);
5022 ret
= dev_get_valid_name(dev
, dev
->name
, 0);
5026 dev
->ifindex
= dev_new_index(net
);
5027 if (dev
->iflink
== -1)
5028 dev
->iflink
= dev
->ifindex
;
5030 /* Fix illegal checksum combinations */
5031 if ((dev
->features
& NETIF_F_HW_CSUM
) &&
5032 (dev
->features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5033 printk(KERN_NOTICE
"%s: mixed HW and IP checksum settings.\n",
5035 dev
->features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5038 if ((dev
->features
& NETIF_F_NO_CSUM
) &&
5039 (dev
->features
& (NETIF_F_HW_CSUM
|NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5040 printk(KERN_NOTICE
"%s: mixed no checksumming and other settings.\n",
5042 dev
->features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
|NETIF_F_HW_CSUM
);
5045 dev
->features
= netdev_fix_features(dev
->features
, dev
->name
);
5047 /* Enable software GSO if SG is supported. */
5048 if (dev
->features
& NETIF_F_SG
)
5049 dev
->features
|= NETIF_F_GSO
;
5051 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5052 ret
= notifier_to_errno(ret
);
5056 ret
= netdev_register_kobject(dev
);
5059 dev
->reg_state
= NETREG_REGISTERED
;
5062 * Default initial state at registry is that the
5063 * device is present.
5066 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5068 dev_init_scheduler(dev
);
5070 list_netdevice(dev
);
5072 /* Notify protocols, that a new device appeared. */
5073 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5074 ret
= notifier_to_errno(ret
);
5076 rollback_registered(dev
);
5077 dev
->reg_state
= NETREG_UNREGISTERED
;
5080 * Prevent userspace races by waiting until the network
5081 * device is fully setup before sending notifications.
5083 if (!dev
->rtnl_link_ops
||
5084 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5085 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5091 if (dev
->netdev_ops
->ndo_uninit
)
5092 dev
->netdev_ops
->ndo_uninit(dev
);
5095 EXPORT_SYMBOL(register_netdevice
);
5098 * init_dummy_netdev - init a dummy network device for NAPI
5099 * @dev: device to init
5101 * This takes a network device structure and initialize the minimum
5102 * amount of fields so it can be used to schedule NAPI polls without
5103 * registering a full blown interface. This is to be used by drivers
5104 * that need to tie several hardware interfaces to a single NAPI
5105 * poll scheduler due to HW limitations.
5107 int init_dummy_netdev(struct net_device
*dev
)
5109 /* Clear everything. Note we don't initialize spinlocks
5110 * are they aren't supposed to be taken by any of the
5111 * NAPI code and this dummy netdev is supposed to be
5112 * only ever used for NAPI polls
5114 memset(dev
, 0, sizeof(struct net_device
));
5116 /* make sure we BUG if trying to hit standard
5117 * register/unregister code path
5119 dev
->reg_state
= NETREG_DUMMY
;
5121 /* initialize the ref count */
5122 atomic_set(&dev
->refcnt
, 1);
5124 /* NAPI wants this */
5125 INIT_LIST_HEAD(&dev
->napi_list
);
5127 /* a dummy interface is started by default */
5128 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5129 set_bit(__LINK_STATE_START
, &dev
->state
);
5133 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5137 * register_netdev - register a network device
5138 * @dev: device to register
5140 * Take a completed network device structure and add it to the kernel
5141 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5142 * chain. 0 is returned on success. A negative errno code is returned
5143 * on a failure to set up the device, or if the name is a duplicate.
5145 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5146 * and expands the device name if you passed a format string to
5149 int register_netdev(struct net_device
*dev
)
5156 * If the name is a format string the caller wants us to do a
5159 if (strchr(dev
->name
, '%')) {
5160 err
= dev_alloc_name(dev
, dev
->name
);
5165 err
= register_netdevice(dev
);
5170 EXPORT_SYMBOL(register_netdev
);
5173 * netdev_wait_allrefs - wait until all references are gone.
5175 * This is called when unregistering network devices.
5177 * Any protocol or device that holds a reference should register
5178 * for netdevice notification, and cleanup and put back the
5179 * reference if they receive an UNREGISTER event.
5180 * We can get stuck here if buggy protocols don't correctly
5183 static void netdev_wait_allrefs(struct net_device
*dev
)
5185 unsigned long rebroadcast_time
, warning_time
;
5187 linkwatch_forget_dev(dev
);
5189 rebroadcast_time
= warning_time
= jiffies
;
5190 while (atomic_read(&dev
->refcnt
) != 0) {
5191 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5194 /* Rebroadcast unregister notification */
5195 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5196 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5197 * should have already handle it the first time */
5199 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5201 /* We must not have linkwatch events
5202 * pending on unregister. If this
5203 * happens, we simply run the queue
5204 * unscheduled, resulting in a noop
5207 linkwatch_run_queue();
5212 rebroadcast_time
= jiffies
;
5217 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5218 printk(KERN_EMERG
"unregister_netdevice: "
5219 "waiting for %s to become free. Usage "
5221 dev
->name
, atomic_read(&dev
->refcnt
));
5222 warning_time
= jiffies
;
5231 * register_netdevice(x1);
5232 * register_netdevice(x2);
5234 * unregister_netdevice(y1);
5235 * unregister_netdevice(y2);
5241 * We are invoked by rtnl_unlock().
5242 * This allows us to deal with problems:
5243 * 1) We can delete sysfs objects which invoke hotplug
5244 * without deadlocking with linkwatch via keventd.
5245 * 2) Since we run with the RTNL semaphore not held, we can sleep
5246 * safely in order to wait for the netdev refcnt to drop to zero.
5248 * We must not return until all unregister events added during
5249 * the interval the lock was held have been completed.
5251 void netdev_run_todo(void)
5253 struct list_head list
;
5255 /* Snapshot list, allow later requests */
5256 list_replace_init(&net_todo_list
, &list
);
5260 while (!list_empty(&list
)) {
5261 struct net_device
*dev
5262 = list_first_entry(&list
, struct net_device
, todo_list
);
5263 list_del(&dev
->todo_list
);
5265 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5266 printk(KERN_ERR
"network todo '%s' but state %d\n",
5267 dev
->name
, dev
->reg_state
);
5272 dev
->reg_state
= NETREG_UNREGISTERED
;
5274 on_each_cpu(flush_backlog
, dev
, 1);
5276 netdev_wait_allrefs(dev
);
5279 BUG_ON(atomic_read(&dev
->refcnt
));
5280 WARN_ON(dev
->ip_ptr
);
5281 WARN_ON(dev
->ip6_ptr
);
5282 WARN_ON(dev
->dn_ptr
);
5284 if (dev
->destructor
)
5285 dev
->destructor(dev
);
5287 /* Free network device */
5288 kobject_put(&dev
->dev
.kobj
);
5293 * dev_txq_stats_fold - fold tx_queues stats
5294 * @dev: device to get statistics from
5295 * @stats: struct rtnl_link_stats64 to hold results
5297 void dev_txq_stats_fold(const struct net_device
*dev
,
5298 struct rtnl_link_stats64
*stats
)
5300 u64 tx_bytes
= 0, tx_packets
= 0, tx_dropped
= 0;
5302 struct netdev_queue
*txq
;
5304 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
5305 txq
= netdev_get_tx_queue(dev
, i
);
5306 spin_lock_bh(&txq
->_xmit_lock
);
5307 tx_bytes
+= txq
->tx_bytes
;
5308 tx_packets
+= txq
->tx_packets
;
5309 tx_dropped
+= txq
->tx_dropped
;
5310 spin_unlock_bh(&txq
->_xmit_lock
);
5312 if (tx_bytes
|| tx_packets
|| tx_dropped
) {
5313 stats
->tx_bytes
= tx_bytes
;
5314 stats
->tx_packets
= tx_packets
;
5315 stats
->tx_dropped
= tx_dropped
;
5318 EXPORT_SYMBOL(dev_txq_stats_fold
);
5320 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5321 * fields in the same order, with only the type differing.
5323 static void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5324 const struct net_device_stats
*netdev_stats
)
5326 #if BITS_PER_LONG == 64
5327 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5328 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5330 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5331 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5332 u64
*dst
= (u64
*)stats64
;
5334 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5335 sizeof(*stats64
) / sizeof(u64
));
5336 for (i
= 0; i
< n
; i
++)
5342 * dev_get_stats - get network device statistics
5343 * @dev: device to get statistics from
5344 * @storage: place to store stats
5346 * Get network statistics from device. Return @storage.
5347 * The device driver may provide its own method by setting
5348 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5349 * otherwise the internal statistics structure is used.
5351 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5352 struct rtnl_link_stats64
*storage
)
5354 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5356 if (ops
->ndo_get_stats64
) {
5357 memset(storage
, 0, sizeof(*storage
));
5358 return ops
->ndo_get_stats64(dev
, storage
);
5360 if (ops
->ndo_get_stats
) {
5361 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5364 netdev_stats_to_stats64(storage
, &dev
->stats
);
5365 dev_txq_stats_fold(dev
, storage
);
5368 EXPORT_SYMBOL(dev_get_stats
);
5370 static void netdev_init_one_queue(struct net_device
*dev
,
5371 struct netdev_queue
*queue
,
5377 static void netdev_init_queues(struct net_device
*dev
)
5379 netdev_init_one_queue(dev
, &dev
->rx_queue
, NULL
);
5380 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5381 spin_lock_init(&dev
->tx_global_lock
);
5385 * alloc_netdev_mq - allocate network device
5386 * @sizeof_priv: size of private data to allocate space for
5387 * @name: device name format string
5388 * @setup: callback to initialize device
5389 * @queue_count: the number of subqueues to allocate
5391 * Allocates a struct net_device with private data area for driver use
5392 * and performs basic initialization. Also allocates subquue structs
5393 * for each queue on the device at the end of the netdevice.
5395 struct net_device
*alloc_netdev_mq(int sizeof_priv
, const char *name
,
5396 void (*setup
)(struct net_device
*), unsigned int queue_count
)
5398 struct netdev_queue
*tx
;
5399 struct net_device
*dev
;
5401 struct net_device
*p
;
5403 struct netdev_rx_queue
*rx
;
5407 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5409 alloc_size
= sizeof(struct net_device
);
5411 /* ensure 32-byte alignment of private area */
5412 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5413 alloc_size
+= sizeof_priv
;
5415 /* ensure 32-byte alignment of whole construct */
5416 alloc_size
+= NETDEV_ALIGN
- 1;
5418 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5420 printk(KERN_ERR
"alloc_netdev: Unable to allocate device.\n");
5424 tx
= kcalloc(queue_count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5426 printk(KERN_ERR
"alloc_netdev: Unable to allocate "
5432 rx
= kcalloc(queue_count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5434 printk(KERN_ERR
"alloc_netdev: Unable to allocate "
5439 atomic_set(&rx
->count
, queue_count
);
5442 * Set a pointer to first element in the array which holds the
5445 for (i
= 0; i
< queue_count
; i
++)
5449 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5450 dev
->padded
= (char *)dev
- (char *)p
;
5452 if (dev_addr_init(dev
))
5458 dev_net_set(dev
, &init_net
);
5461 dev
->num_tx_queues
= queue_count
;
5462 dev
->real_num_tx_queues
= queue_count
;
5466 dev
->num_rx_queues
= queue_count
;
5469 dev
->gso_max_size
= GSO_MAX_SIZE
;
5471 netdev_init_queues(dev
);
5473 INIT_LIST_HEAD(&dev
->ethtool_ntuple_list
.list
);
5474 dev
->ethtool_ntuple_list
.count
= 0;
5475 INIT_LIST_HEAD(&dev
->napi_list
);
5476 INIT_LIST_HEAD(&dev
->unreg_list
);
5477 INIT_LIST_HEAD(&dev
->link_watch_list
);
5478 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
5480 strcpy(dev
->name
, name
);
5493 EXPORT_SYMBOL(alloc_netdev_mq
);
5496 * free_netdev - free network device
5499 * This function does the last stage of destroying an allocated device
5500 * interface. The reference to the device object is released.
5501 * If this is the last reference then it will be freed.
5503 void free_netdev(struct net_device
*dev
)
5505 struct napi_struct
*p
, *n
;
5507 release_net(dev_net(dev
));
5511 /* Flush device addresses */
5512 dev_addr_flush(dev
);
5514 /* Clear ethtool n-tuple list */
5515 ethtool_ntuple_flush(dev
);
5517 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
5520 /* Compatibility with error handling in drivers */
5521 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5522 kfree((char *)dev
- dev
->padded
);
5526 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
5527 dev
->reg_state
= NETREG_RELEASED
;
5529 /* will free via device release */
5530 put_device(&dev
->dev
);
5532 EXPORT_SYMBOL(free_netdev
);
5535 * synchronize_net - Synchronize with packet receive processing
5537 * Wait for packets currently being received to be done.
5538 * Does not block later packets from starting.
5540 void synchronize_net(void)
5545 EXPORT_SYMBOL(synchronize_net
);
5548 * unregister_netdevice_queue - remove device from the kernel
5552 * This function shuts down a device interface and removes it
5553 * from the kernel tables.
5554 * If head not NULL, device is queued to be unregistered later.
5556 * Callers must hold the rtnl semaphore. You may want
5557 * unregister_netdev() instead of this.
5560 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
5565 list_move_tail(&dev
->unreg_list
, head
);
5567 rollback_registered(dev
);
5568 /* Finish processing unregister after unlock */
5572 EXPORT_SYMBOL(unregister_netdevice_queue
);
5575 * unregister_netdevice_many - unregister many devices
5576 * @head: list of devices
5578 void unregister_netdevice_many(struct list_head
*head
)
5580 struct net_device
*dev
;
5582 if (!list_empty(head
)) {
5583 rollback_registered_many(head
);
5584 list_for_each_entry(dev
, head
, unreg_list
)
5588 EXPORT_SYMBOL(unregister_netdevice_many
);
5591 * unregister_netdev - remove device from the kernel
5594 * This function shuts down a device interface and removes it
5595 * from the kernel tables.
5597 * This is just a wrapper for unregister_netdevice that takes
5598 * the rtnl semaphore. In general you want to use this and not
5599 * unregister_netdevice.
5601 void unregister_netdev(struct net_device
*dev
)
5604 unregister_netdevice(dev
);
5607 EXPORT_SYMBOL(unregister_netdev
);
5610 * dev_change_net_namespace - move device to different nethost namespace
5612 * @net: network namespace
5613 * @pat: If not NULL name pattern to try if the current device name
5614 * is already taken in the destination network namespace.
5616 * This function shuts down a device interface and moves it
5617 * to a new network namespace. On success 0 is returned, on
5618 * a failure a netagive errno code is returned.
5620 * Callers must hold the rtnl semaphore.
5623 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
5629 /* Don't allow namespace local devices to be moved. */
5631 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
5634 /* Ensure the device has been registrered */
5636 if (dev
->reg_state
!= NETREG_REGISTERED
)
5639 /* Get out if there is nothing todo */
5641 if (net_eq(dev_net(dev
), net
))
5644 /* Pick the destination device name, and ensure
5645 * we can use it in the destination network namespace.
5648 if (__dev_get_by_name(net
, dev
->name
)) {
5649 /* We get here if we can't use the current device name */
5652 if (dev_get_valid_name(dev
, pat
, 1))
5657 * And now a mini version of register_netdevice unregister_netdevice.
5660 /* If device is running close it first. */
5663 /* And unlink it from device chain */
5665 unlist_netdevice(dev
);
5669 /* Shutdown queueing discipline. */
5672 /* Notify protocols, that we are about to destroy
5673 this device. They should clean all the things.
5675 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5676 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
5679 * Flush the unicast and multicast chains
5684 /* Actually switch the network namespace */
5685 dev_net_set(dev
, net
);
5687 /* If there is an ifindex conflict assign a new one */
5688 if (__dev_get_by_index(net
, dev
->ifindex
)) {
5689 int iflink
= (dev
->iflink
== dev
->ifindex
);
5690 dev
->ifindex
= dev_new_index(net
);
5692 dev
->iflink
= dev
->ifindex
;
5695 /* Fixup kobjects */
5696 err
= device_rename(&dev
->dev
, dev
->name
);
5699 /* Add the device back in the hashes */
5700 list_netdevice(dev
);
5702 /* Notify protocols, that a new device appeared. */
5703 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5706 * Prevent userspace races by waiting until the network
5707 * device is fully setup before sending notifications.
5709 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5716 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
5718 static int dev_cpu_callback(struct notifier_block
*nfb
,
5719 unsigned long action
,
5722 struct sk_buff
**list_skb
;
5723 struct sk_buff
*skb
;
5724 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
5725 struct softnet_data
*sd
, *oldsd
;
5727 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
5730 local_irq_disable();
5731 cpu
= smp_processor_id();
5732 sd
= &per_cpu(softnet_data
, cpu
);
5733 oldsd
= &per_cpu(softnet_data
, oldcpu
);
5735 /* Find end of our completion_queue. */
5736 list_skb
= &sd
->completion_queue
;
5738 list_skb
= &(*list_skb
)->next
;
5739 /* Append completion queue from offline CPU. */
5740 *list_skb
= oldsd
->completion_queue
;
5741 oldsd
->completion_queue
= NULL
;
5743 /* Append output queue from offline CPU. */
5744 if (oldsd
->output_queue
) {
5745 *sd
->output_queue_tailp
= oldsd
->output_queue
;
5746 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
5747 oldsd
->output_queue
= NULL
;
5748 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
5751 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
5754 /* Process offline CPU's input_pkt_queue */
5755 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
5757 input_queue_head_incr(oldsd
);
5759 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
5761 input_queue_head_incr(oldsd
);
5769 * netdev_increment_features - increment feature set by one
5770 * @all: current feature set
5771 * @one: new feature set
5772 * @mask: mask feature set
5774 * Computes a new feature set after adding a device with feature set
5775 * @one to the master device with current feature set @all. Will not
5776 * enable anything that is off in @mask. Returns the new feature set.
5778 unsigned long netdev_increment_features(unsigned long all
, unsigned long one
,
5781 /* If device needs checksumming, downgrade to it. */
5782 if (all
& NETIF_F_NO_CSUM
&& !(one
& NETIF_F_NO_CSUM
))
5783 all
^= NETIF_F_NO_CSUM
| (one
& NETIF_F_ALL_CSUM
);
5784 else if (mask
& NETIF_F_ALL_CSUM
) {
5785 /* If one device supports v4/v6 checksumming, set for all. */
5786 if (one
& (NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
) &&
5787 !(all
& NETIF_F_GEN_CSUM
)) {
5788 all
&= ~NETIF_F_ALL_CSUM
;
5789 all
|= one
& (NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
);
5792 /* If one device supports hw checksumming, set for all. */
5793 if (one
& NETIF_F_GEN_CSUM
&& !(all
& NETIF_F_GEN_CSUM
)) {
5794 all
&= ~NETIF_F_ALL_CSUM
;
5795 all
|= NETIF_F_HW_CSUM
;
5799 one
|= NETIF_F_ALL_CSUM
;
5801 one
|= all
& NETIF_F_ONE_FOR_ALL
;
5802 all
&= one
| NETIF_F_LLTX
| NETIF_F_GSO
| NETIF_F_UFO
;
5803 all
|= one
& mask
& NETIF_F_ONE_FOR_ALL
;
5807 EXPORT_SYMBOL(netdev_increment_features
);
5809 static struct hlist_head
*netdev_create_hash(void)
5812 struct hlist_head
*hash
;
5814 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
5816 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
5817 INIT_HLIST_HEAD(&hash
[i
]);
5822 /* Initialize per network namespace state */
5823 static int __net_init
netdev_init(struct net
*net
)
5825 INIT_LIST_HEAD(&net
->dev_base_head
);
5827 net
->dev_name_head
= netdev_create_hash();
5828 if (net
->dev_name_head
== NULL
)
5831 net
->dev_index_head
= netdev_create_hash();
5832 if (net
->dev_index_head
== NULL
)
5838 kfree(net
->dev_name_head
);
5844 * netdev_drivername - network driver for the device
5845 * @dev: network device
5846 * @buffer: buffer for resulting name
5847 * @len: size of buffer
5849 * Determine network driver for device.
5851 char *netdev_drivername(const struct net_device
*dev
, char *buffer
, int len
)
5853 const struct device_driver
*driver
;
5854 const struct device
*parent
;
5856 if (len
<= 0 || !buffer
)
5860 parent
= dev
->dev
.parent
;
5865 driver
= parent
->driver
;
5866 if (driver
&& driver
->name
)
5867 strlcpy(buffer
, driver
->name
, len
);
5871 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
5872 struct va_format
*vaf
)
5876 if (dev
&& dev
->dev
.parent
)
5877 r
= dev_printk(level
, dev
->dev
.parent
, "%s: %pV",
5878 netdev_name(dev
), vaf
);
5880 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
5882 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
5887 int netdev_printk(const char *level
, const struct net_device
*dev
,
5888 const char *format
, ...)
5890 struct va_format vaf
;
5894 va_start(args
, format
);
5899 r
= __netdev_printk(level
, dev
, &vaf
);
5904 EXPORT_SYMBOL(netdev_printk
);
5906 #define define_netdev_printk_level(func, level) \
5907 int func(const struct net_device *dev, const char *fmt, ...) \
5910 struct va_format vaf; \
5913 va_start(args, fmt); \
5918 r = __netdev_printk(level, dev, &vaf); \
5923 EXPORT_SYMBOL(func);
5925 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
5926 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
5927 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
5928 define_netdev_printk_level(netdev_err
, KERN_ERR
);
5929 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
5930 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
5931 define_netdev_printk_level(netdev_info
, KERN_INFO
);
5933 static void __net_exit
netdev_exit(struct net
*net
)
5935 kfree(net
->dev_name_head
);
5936 kfree(net
->dev_index_head
);
5939 static struct pernet_operations __net_initdata netdev_net_ops
= {
5940 .init
= netdev_init
,
5941 .exit
= netdev_exit
,
5944 static void __net_exit
default_device_exit(struct net
*net
)
5946 struct net_device
*dev
, *aux
;
5948 * Push all migratable network devices back to the
5949 * initial network namespace
5952 for_each_netdev_safe(net
, dev
, aux
) {
5954 char fb_name
[IFNAMSIZ
];
5956 /* Ignore unmoveable devices (i.e. loopback) */
5957 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
5960 /* Leave virtual devices for the generic cleanup */
5961 if (dev
->rtnl_link_ops
)
5964 /* Push remaing network devices to init_net */
5965 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
5966 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
5968 printk(KERN_EMERG
"%s: failed to move %s to init_net: %d\n",
5969 __func__
, dev
->name
, err
);
5976 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
5978 /* At exit all network devices most be removed from a network
5979 * namespace. Do this in the reverse order of registeration.
5980 * Do this across as many network namespaces as possible to
5981 * improve batching efficiency.
5983 struct net_device
*dev
;
5985 LIST_HEAD(dev_kill_list
);
5988 list_for_each_entry(net
, net_list
, exit_list
) {
5989 for_each_netdev_reverse(net
, dev
) {
5990 if (dev
->rtnl_link_ops
)
5991 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
5993 unregister_netdevice_queue(dev
, &dev_kill_list
);
5996 unregister_netdevice_many(&dev_kill_list
);
6000 static struct pernet_operations __net_initdata default_device_ops
= {
6001 .exit
= default_device_exit
,
6002 .exit_batch
= default_device_exit_batch
,
6006 * Initialize the DEV module. At boot time this walks the device list and
6007 * unhooks any devices that fail to initialise (normally hardware not
6008 * present) and leaves us with a valid list of present and active devices.
6013 * This is called single threaded during boot, so no need
6014 * to take the rtnl semaphore.
6016 static int __init
net_dev_init(void)
6018 int i
, rc
= -ENOMEM
;
6020 BUG_ON(!dev_boot_phase
);
6022 if (dev_proc_init())
6025 if (netdev_kobject_init())
6028 INIT_LIST_HEAD(&ptype_all
);
6029 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6030 INIT_LIST_HEAD(&ptype_base
[i
]);
6032 if (register_pernet_subsys(&netdev_net_ops
))
6036 * Initialise the packet receive queues.
6039 for_each_possible_cpu(i
) {
6040 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6042 memset(sd
, 0, sizeof(*sd
));
6043 skb_queue_head_init(&sd
->input_pkt_queue
);
6044 skb_queue_head_init(&sd
->process_queue
);
6045 sd
->completion_queue
= NULL
;
6046 INIT_LIST_HEAD(&sd
->poll_list
);
6047 sd
->output_queue
= NULL
;
6048 sd
->output_queue_tailp
= &sd
->output_queue
;
6050 sd
->csd
.func
= rps_trigger_softirq
;
6056 sd
->backlog
.poll
= process_backlog
;
6057 sd
->backlog
.weight
= weight_p
;
6058 sd
->backlog
.gro_list
= NULL
;
6059 sd
->backlog
.gro_count
= 0;
6064 /* The loopback device is special if any other network devices
6065 * is present in a network namespace the loopback device must
6066 * be present. Since we now dynamically allocate and free the
6067 * loopback device ensure this invariant is maintained by
6068 * keeping the loopback device as the first device on the
6069 * list of network devices. Ensuring the loopback devices
6070 * is the first device that appears and the last network device
6073 if (register_pernet_device(&loopback_net_ops
))
6076 if (register_pernet_device(&default_device_ops
))
6079 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6080 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6082 hotcpu_notifier(dev_cpu_callback
, 0);
6090 subsys_initcall(net_dev_init
);
6092 static int __init
initialize_hashrnd(void)
6094 get_random_bytes(&hashrnd
, sizeof(hashrnd
));
6098 late_initcall_sync(initialize_hashrnd
);