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 <trace/events/net.h>
132 #include <trace/events/skb.h>
133 #include <linux/pci.h>
134 #include <linux/inetdevice.h>
135 #include <linux/cpu_rmap.h>
136 #include <linux/if_tunnel.h>
137 #include <linux/if_pppox.h>
138 #include <linux/ppp_defs.h>
139 #include <linux/net_tstamp.h>
141 #include "net-sysfs.h"
143 /* Instead of increasing this, you should create a hash table. */
144 #define MAX_GRO_SKBS 8
146 /* This should be increased if a protocol with a bigger head is added. */
147 #define GRO_MAX_HEAD (MAX_HEADER + 128)
150 * The list of packet types we will receive (as opposed to discard)
151 * and the routines to invoke.
153 * Why 16. Because with 16 the only overlap we get on a hash of the
154 * low nibble of the protocol value is RARP/SNAP/X.25.
156 * NOTE: That is no longer true with the addition of VLAN tags. Not
157 * sure which should go first, but I bet it won't make much
158 * difference if we are running VLANs. The good news is that
159 * this protocol won't be in the list unless compiled in, so
160 * the average user (w/out VLANs) will not be adversely affected.
177 #define PTYPE_HASH_SIZE (16)
178 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
180 static DEFINE_SPINLOCK(ptype_lock);
181 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
182 static struct list_head ptype_all __read_mostly; /* Taps */
185 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
188 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
190 * Writers must hold the rtnl semaphore while they loop through the
191 * dev_base_head list, and hold dev_base_lock for writing when they do the
192 * actual updates. This allows pure readers to access the list even
193 * while a writer is preparing to update it.
195 * To put it another way, dev_base_lock is held for writing only to
196 * protect against pure readers; the rtnl semaphore provides the
197 * protection against other writers.
199 * See, for example usages, register_netdevice() and
200 * unregister_netdevice(), which must be called with the rtnl
203 DEFINE_RWLOCK(dev_base_lock);
204 EXPORT_SYMBOL(dev_base_lock);
206 static inline void dev_base_seq_inc(struct net *net)
208 while (++net->dev_base_seq == 0);
211 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
213 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
214 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
217 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
219 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
222 static inline void rps_lock(struct softnet_data *sd)
225 spin_lock(&sd->input_pkt_queue.lock);
229 static inline void rps_unlock(struct softnet_data *sd)
232 spin_unlock(&sd->input_pkt_queue.lock);
236 /* Device list insertion */
237 static int list_netdevice(struct net_device *dev)
239 struct net *net = dev_net(dev);
243 write_lock_bh(&dev_base_lock);
244 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
245 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
246 hlist_add_head_rcu(&dev->index_hlist,
247 dev_index_hash(net, dev->ifindex));
248 write_unlock_bh(&dev_base_lock);
250 dev_base_seq_inc(net);
255 /* Device list removal
256 * caller must respect a RCU grace period before freeing/reusing dev
258 static void unlist_netdevice(struct net_device *dev)
262 /* Unlink dev from the device chain */
263 write_lock_bh(&dev_base_lock);
264 list_del_rcu(&dev->dev_list);
265 hlist_del_rcu(&dev->name_hlist);
266 hlist_del_rcu(&dev->index_hlist);
267 write_unlock_bh(&dev_base_lock);
269 dev_base_seq_inc(dev_net(dev));
276 static RAW_NOTIFIER_HEAD(netdev_chain);
279 * Device drivers call our routines to queue packets here. We empty the
280 * queue in the local softnet handler.
283 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
284 EXPORT_PER_CPU_SYMBOL(softnet_data);
286 #ifdef CONFIG_LOCKDEP
288 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
289 * according to dev->type
291 static const unsigned short netdev_lock_type[] =
292 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
293 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
294 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
295 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
296 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
297 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
298 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
299 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
300 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
301 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
302 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
303 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
304 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
305 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
306 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
307 ARPHRD_VOID, ARPHRD_NONE};
309 static const char *const netdev_lock_name[] =
310 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
311 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
312 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
313 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
314 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
315 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
316 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
317 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
318 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
319 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
320 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
321 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
322 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
323 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
324 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
325 "_xmit_VOID", "_xmit_NONE"};
327 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
328 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
330 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
334 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
335 if (netdev_lock_type[i] == dev_type)
337 /* the last key is used by default */
338 return ARRAY_SIZE(netdev_lock_type) - 1;
341 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
342 unsigned short dev_type)
346 i = netdev_lock_pos(dev_type);
347 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
348 netdev_lock_name[i]);
351 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
355 i = netdev_lock_pos(dev->type);
356 lockdep_set_class_and_name(&dev->addr_list_lock,
357 &netdev_addr_lock_key[i],
358 netdev_lock_name[i]);
361 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
362 unsigned short dev_type)
365 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
370 /*******************************************************************************
372 Protocol management and registration routines
374 *******************************************************************************/
377 * Add a protocol ID to the list. Now that the input handler is
378 * smarter we can dispense with all the messy stuff that used to be
381 * BEWARE!!! Protocol handlers, mangling input packets,
382 * MUST BE last in hash buckets and checking protocol handlers
383 * MUST start from promiscuous ptype_all chain in net_bh.
384 * It is true now, do not change it.
385 * Explanation follows: if protocol handler, mangling packet, will
386 * be the first on list, it is not able to sense, that packet
387 * is cloned and should be copied-on-write, so that it will
388 * change it and subsequent readers will get broken packet.
392 static inline struct list_head *ptype_head(const struct packet_type *pt)
394 if (pt->type == htons(ETH_P_ALL))
397 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
401 * dev_add_pack - add packet handler
402 * @pt: packet type declaration
404 * Add a protocol handler to the networking stack. The passed &packet_type
405 * is linked into kernel lists and may not be freed until it has been
406 * removed from the kernel lists.
408 * This call does not sleep therefore it can not
409 * guarantee all CPU's that are in middle of receiving packets
410 * will see the new packet type (until the next received packet).
413 void dev_add_pack(struct packet_type *pt)
415 struct list_head *head = ptype_head(pt);
417 spin_lock(&ptype_lock);
418 list_add_rcu(&pt->list, head);
419 spin_unlock(&ptype_lock);
421 EXPORT_SYMBOL(dev_add_pack);
424 * __dev_remove_pack - remove packet handler
425 * @pt: packet type declaration
427 * Remove a protocol handler that was previously added to the kernel
428 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
429 * from the kernel lists and can be freed or reused once this function
432 * The packet type might still be in use by receivers
433 * and must not be freed until after all the CPU's have gone
434 * through a quiescent state.
436 void __dev_remove_pack(struct packet_type *pt)
438 struct list_head *head = ptype_head(pt);
439 struct packet_type *pt1;
441 spin_lock(&ptype_lock);
443 list_for_each_entry(pt1, head, list) {
445 list_del_rcu(&pt->list);
450 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
452 spin_unlock(&ptype_lock);
454 EXPORT_SYMBOL(__dev_remove_pack);
457 * dev_remove_pack - remove packet handler
458 * @pt: packet type declaration
460 * Remove a protocol handler that was previously added to the kernel
461 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
462 * from the kernel lists and can be freed or reused once this function
465 * This call sleeps to guarantee that no CPU is looking at the packet
468 void dev_remove_pack(struct packet_type *pt)
470 __dev_remove_pack(pt);
474 EXPORT_SYMBOL(dev_remove_pack);
476 /******************************************************************************
478 Device Boot-time Settings Routines
480 *******************************************************************************/
482 /* Boot time configuration table */
483 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
486 * netdev_boot_setup_add - add new setup entry
487 * @name: name of the device
488 * @map: configured settings for the device
490 * Adds new setup entry to the dev_boot_setup list. The function
491 * returns 0 on error and 1 on success. This is a generic routine to
494 static int netdev_boot_setup_add(char *name, struct ifmap *map)
496 struct netdev_boot_setup *s;
500 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
501 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
502 memset(s[i].name, 0, sizeof(s[i].name));
503 strlcpy(s[i].name, name, IFNAMSIZ);
504 memcpy(&s[i].map, map, sizeof(s[i].map));
509 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
513 * netdev_boot_setup_check - check boot time settings
514 * @dev: the netdevice
516 * Check boot time settings for the device.
517 * The found settings are set for the device to be used
518 * later in the device probing.
519 * Returns 0 if no settings found, 1 if they are.
521 int netdev_boot_setup_check(struct net_device *dev)
523 struct netdev_boot_setup *s = dev_boot_setup;
526 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
527 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
528 !strcmp(dev->name, s[i].name)) {
529 dev->irq = s[i].map.irq;
530 dev->base_addr = s[i].map.base_addr;
531 dev->mem_start = s[i].map.mem_start;
532 dev->mem_end = s[i].map.mem_end;
538 EXPORT_SYMBOL(netdev_boot_setup_check);
542 * netdev_boot_base - get address from boot time settings
543 * @prefix: prefix for network device
544 * @unit: id for network device
546 * Check boot time settings for the base address of device.
547 * The found settings are set for the device to be used
548 * later in the device probing.
549 * Returns 0 if no settings found.
551 unsigned long netdev_boot_base(const char *prefix, int unit)
553 const struct netdev_boot_setup *s = dev_boot_setup;
557 sprintf(name, "%s%d", prefix, unit);
560 * If device already registered then return base of 1
561 * to indicate not to probe for this interface
563 if (__dev_get_by_name(&init_net, name))
566 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
567 if (!strcmp(name, s[i].name))
568 return s[i].map.base_addr;
573 * Saves at boot time configured settings for any netdevice.
575 int __init netdev_boot_setup(char *str)
580 str = get_options(str, ARRAY_SIZE(ints), ints);
585 memset(&map, 0, sizeof(map));
589 map.base_addr = ints[2];
591 map.mem_start = ints[3];
593 map.mem_end = ints[4];
595 /* Add new entry to the list */
596 return netdev_boot_setup_add(str, &map);
599 __setup("netdev=", netdev_boot_setup);
601 /*******************************************************************************
603 Device Interface Subroutines
605 *******************************************************************************/
608 * __dev_get_by_name - find a device by its name
609 * @net: the applicable net namespace
610 * @name: name to find
612 * Find an interface by name. Must be called under RTNL semaphore
613 * or @dev_base_lock. If the name is found a pointer to the device
614 * is returned. If the name is not found then %NULL is returned. The
615 * reference counters are not incremented so the caller must be
616 * careful with locks.
619 struct net_device *__dev_get_by_name(struct net *net, const char *name)
621 struct hlist_node *p;
622 struct net_device *dev;
623 struct hlist_head *head = dev_name_hash(net, name);
625 hlist_for_each_entry(dev, p, head, name_hlist)
626 if (!strncmp(dev->name, name, IFNAMSIZ))
631 EXPORT_SYMBOL(__dev_get_by_name);
634 * dev_get_by_name_rcu - find a device by its name
635 * @net: the applicable net namespace
636 * @name: name to find
638 * Find an interface by name.
639 * If the name is found a pointer to the device is returned.
640 * If the name is not found then %NULL is returned.
641 * The reference counters are not incremented so the caller must be
642 * careful with locks. The caller must hold RCU lock.
645 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
647 struct hlist_node *p;
648 struct net_device *dev;
649 struct hlist_head *head = dev_name_hash(net, name);
651 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
652 if (!strncmp(dev->name, name, IFNAMSIZ))
657 EXPORT_SYMBOL(dev_get_by_name_rcu);
660 * dev_get_by_name - find a device by its name
661 * @net: the applicable net namespace
662 * @name: name to find
664 * Find an interface by name. This can be called from any
665 * context and does its own locking. The returned handle has
666 * the usage count incremented and the caller must use dev_put() to
667 * release it when it is no longer needed. %NULL is returned if no
668 * matching device is found.
671 struct net_device *dev_get_by_name(struct net *net, const char *name)
673 struct net_device *dev;
676 dev = dev_get_by_name_rcu(net, name);
682 EXPORT_SYMBOL(dev_get_by_name);
685 * __dev_get_by_index - find a device by its ifindex
686 * @net: the applicable net namespace
687 * @ifindex: index of device
689 * Search for an interface by index. Returns %NULL if the device
690 * is not found or a pointer to the device. The device has not
691 * had its reference counter increased so the caller must be careful
692 * about locking. The caller must hold either the RTNL semaphore
696 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
698 struct hlist_node *p;
699 struct net_device *dev;
700 struct hlist_head *head = dev_index_hash(net, ifindex);
702 hlist_for_each_entry(dev, p, head, index_hlist)
703 if (dev->ifindex == ifindex)
708 EXPORT_SYMBOL(__dev_get_by_index);
711 * dev_get_by_index_rcu - find a device by its ifindex
712 * @net: the applicable net namespace
713 * @ifindex: index of device
715 * Search for an interface by index. Returns %NULL if the device
716 * is not found or a pointer to the device. The device has not
717 * had its reference counter increased so the caller must be careful
718 * about locking. The caller must hold RCU lock.
721 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
723 struct hlist_node *p;
724 struct net_device *dev;
725 struct hlist_head *head = dev_index_hash(net, ifindex);
727 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
728 if (dev->ifindex == ifindex)
733 EXPORT_SYMBOL(dev_get_by_index_rcu);
737 * dev_get_by_index - find a device by its ifindex
738 * @net: the applicable net namespace
739 * @ifindex: index of device
741 * Search for an interface by index. Returns NULL if the device
742 * is not found or a pointer to the device. The device returned has
743 * had a reference added and the pointer is safe until the user calls
744 * dev_put to indicate they have finished with it.
747 struct net_device *dev_get_by_index(struct net *net, int ifindex)
749 struct net_device *dev;
752 dev = dev_get_by_index_rcu(net, ifindex);
758 EXPORT_SYMBOL(dev_get_by_index);
761 * dev_getbyhwaddr_rcu - find a device by its hardware address
762 * @net: the applicable net namespace
763 * @type: media type of device
764 * @ha: hardware address
766 * Search for an interface by MAC address. Returns NULL if the device
767 * is not found or a pointer to the device.
768 * The caller must hold RCU or RTNL.
769 * The returned device has not had its ref count increased
770 * and the caller must therefore be careful about locking
774 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
777 struct net_device *dev;
779 for_each_netdev_rcu(net, dev)
780 if (dev->type == type &&
781 !memcmp(dev->dev_addr, ha, dev->addr_len))
786 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
788 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
790 struct net_device *dev;
793 for_each_netdev(net, dev)
794 if (dev->type == type)
799 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
801 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
803 struct net_device *dev, *ret = NULL;
806 for_each_netdev_rcu(net, dev)
807 if (dev->type == type) {
815 EXPORT_SYMBOL(dev_getfirstbyhwtype);
818 * dev_get_by_flags_rcu - find any device with given flags
819 * @net: the applicable net namespace
820 * @if_flags: IFF_* values
821 * @mask: bitmask of bits in if_flags to check
823 * Search for any interface with the given flags. Returns NULL if a device
824 * is not found or a pointer to the device. Must be called inside
825 * rcu_read_lock(), and result refcount is unchanged.
828 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
831 struct net_device *dev, *ret;
834 for_each_netdev_rcu(net, dev) {
835 if (((dev->flags ^ if_flags) & mask) == 0) {
842 EXPORT_SYMBOL(dev_get_by_flags_rcu);
845 * dev_valid_name - check if name is okay for network device
848 * Network device names need to be valid file names to
849 * to allow sysfs to work. We also disallow any kind of
852 int dev_valid_name(const char *name)
856 if (strlen(name) >= IFNAMSIZ)
858 if (!strcmp(name, ".") || !strcmp(name, ".."))
862 if (*name == '/' || *name == ':' || isspace(*name))
868 EXPORT_SYMBOL(dev_valid_name);
871 * __dev_alloc_name - allocate a name for a device
872 * @net: network namespace to allocate the device name in
873 * @name: name format string
874 * @buf: scratch buffer and result name string
876 * Passed a format string - eg "lt%d" it will try and find a suitable
877 * id. It scans list of devices to build up a free map, then chooses
878 * the first empty slot. The caller must hold the dev_base or rtnl lock
879 * while allocating the name and adding the device in order to avoid
881 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
882 * Returns the number of the unit assigned or a negative errno code.
885 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
889 const int max_netdevices = 8*PAGE_SIZE;
890 unsigned long *inuse;
891 struct net_device *d;
893 p = strnchr(name, IFNAMSIZ-1, '%');
896 * Verify the string as this thing may have come from
897 * the user. There must be either one "%d" and no other "%"
900 if (p[1] != 'd' || strchr(p + 2, '%'))
903 /* Use one page as a bit array of possible slots */
904 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
908 for_each_netdev(net, d) {
909 if (!sscanf(d->name, name, &i))
911 if (i < 0 || i >= max_netdevices)
914 /* avoid cases where sscanf is not exact inverse of printf */
915 snprintf(buf, IFNAMSIZ, name, i);
916 if (!strncmp(buf, d->name, IFNAMSIZ))
920 i = find_first_zero_bit(inuse, max_netdevices);
921 free_page((unsigned long) inuse);
925 snprintf(buf, IFNAMSIZ, name, i);
926 if (!__dev_get_by_name(net, buf))
929 /* It is possible to run out of possible slots
930 * when the name is long and there isn't enough space left
931 * for the digits, or if all bits are used.
937 * dev_alloc_name - allocate a name for a device
939 * @name: name format string
941 * Passed a format string - eg "lt%d" it will try and find a suitable
942 * id. It scans list of devices to build up a free map, then chooses
943 * the first empty slot. The caller must hold the dev_base or rtnl lock
944 * while allocating the name and adding the device in order to avoid
946 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
947 * Returns the number of the unit assigned or a negative errno code.
950 int dev_alloc_name(struct net_device *dev, const char *name)
956 BUG_ON(!dev_net(dev));
958 ret = __dev_alloc_name(net, name, buf);
960 strlcpy(dev->name, buf, IFNAMSIZ);
963 EXPORT_SYMBOL(dev_alloc_name);
965 static int dev_get_valid_name(struct net_device *dev, const char *name)
969 BUG_ON(!dev_net(dev));
972 if (!dev_valid_name(name))
975 if (strchr(name, '%'))
976 return dev_alloc_name(dev, name);
977 else if (__dev_get_by_name(net, name))
979 else if (dev->name != name)
980 strlcpy(dev->name, name, IFNAMSIZ);
986 * dev_change_name - change name of a device
988 * @newname: name (or format string) must be at least IFNAMSIZ
990 * Change name of a device, can pass format strings "eth%d".
993 int dev_change_name(struct net_device *dev, const char *newname)
995 char oldname[IFNAMSIZ];
1001 BUG_ON(!dev_net(dev));
1004 if (dev->flags & IFF_UP)
1007 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1010 memcpy(oldname, dev->name, IFNAMSIZ);
1012 err = dev_get_valid_name(dev, newname);
1017 ret = device_rename(&dev->dev, dev->name);
1019 memcpy(dev->name, oldname, IFNAMSIZ);
1023 write_lock_bh(&dev_base_lock);
1024 hlist_del_rcu(&dev->name_hlist);
1025 write_unlock_bh(&dev_base_lock);
1029 write_lock_bh(&dev_base_lock);
1030 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1031 write_unlock_bh(&dev_base_lock);
1033 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1034 ret = notifier_to_errno(ret);
1037 /* err >= 0 after dev_alloc_name() or stores the first errno */
1040 memcpy(dev->name, oldname, IFNAMSIZ);
1044 "%s: name change rollback failed: %d.\n",
1053 * dev_set_alias - change ifalias of a device
1055 * @alias: name up to IFALIASZ
1056 * @len: limit of bytes to copy from info
1058 * Set ifalias for a device,
1060 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1066 if (len >= IFALIASZ)
1071 kfree(dev->ifalias);
1072 dev->ifalias = NULL;
1077 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1080 dev->ifalias = new_ifalias;
1082 strlcpy(dev->ifalias, alias, len+1);
1088 * netdev_features_change - device changes features
1089 * @dev: device to cause notification
1091 * Called to indicate a device has changed features.
1093 void netdev_features_change(struct net_device *dev)
1095 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1097 EXPORT_SYMBOL(netdev_features_change);
1100 * netdev_state_change - device changes state
1101 * @dev: device to cause notification
1103 * Called to indicate a device has changed state. This function calls
1104 * the notifier chains for netdev_chain and sends a NEWLINK message
1105 * to the routing socket.
1107 void netdev_state_change(struct net_device *dev)
1109 if (dev->flags & IFF_UP) {
1110 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1111 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1114 EXPORT_SYMBOL(netdev_state_change);
1116 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1118 return call_netdevice_notifiers(event, dev);
1120 EXPORT_SYMBOL(netdev_bonding_change);
1123 * dev_load - load a network module
1124 * @net: the applicable net namespace
1125 * @name: name of interface
1127 * If a network interface is not present and the process has suitable
1128 * privileges this function loads the module. If module loading is not
1129 * available in this kernel then it becomes a nop.
1132 void dev_load(struct net *net, const char *name)
1134 struct net_device *dev;
1138 dev = dev_get_by_name_rcu(net, name);
1142 if (no_module && capable(CAP_NET_ADMIN))
1143 no_module = request_module("netdev-%s", name);
1144 if (no_module && capable(CAP_SYS_MODULE)) {
1145 if (!request_module("%s", name))
1146 pr_err("Loading kernel module for a network device "
1147 "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s "
1151 EXPORT_SYMBOL(dev_load);
1153 static int __dev_open(struct net_device *dev)
1155 const struct net_device_ops *ops = dev->netdev_ops;
1160 if (!netif_device_present(dev))
1163 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1164 ret = notifier_to_errno(ret);
1168 set_bit(__LINK_STATE_START, &dev->state);
1170 if (ops->ndo_validate_addr)
1171 ret = ops->ndo_validate_addr(dev);
1173 if (!ret && ops->ndo_open)
1174 ret = ops->ndo_open(dev);
1177 clear_bit(__LINK_STATE_START, &dev->state);
1179 dev->flags |= IFF_UP;
1180 net_dmaengine_get();
1181 dev_set_rx_mode(dev);
1183 add_device_randomness(dev->dev_addr, dev->addr_len);
1190 * dev_open - prepare an interface for use.
1191 * @dev: device to open
1193 * Takes a device from down to up state. The device's private open
1194 * function is invoked and then the multicast lists are loaded. Finally
1195 * the device is moved into the up state and a %NETDEV_UP message is
1196 * sent to the netdev notifier chain.
1198 * Calling this function on an active interface is a nop. On a failure
1199 * a negative errno code is returned.
1201 int dev_open(struct net_device *dev)
1205 if (dev->flags & IFF_UP)
1208 ret = __dev_open(dev);
1212 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1213 call_netdevice_notifiers(NETDEV_UP, dev);
1217 EXPORT_SYMBOL(dev_open);
1219 static int __dev_close_many(struct list_head *head)
1221 struct net_device *dev;
1226 list_for_each_entry(dev, head, unreg_list) {
1227 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1229 clear_bit(__LINK_STATE_START, &dev->state);
1231 /* Synchronize to scheduled poll. We cannot touch poll list, it
1232 * can be even on different cpu. So just clear netif_running().
1234 * dev->stop() will invoke napi_disable() on all of it's
1235 * napi_struct instances on this device.
1237 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1240 dev_deactivate_many(head);
1242 list_for_each_entry(dev, head, unreg_list) {
1243 const struct net_device_ops *ops = dev->netdev_ops;
1246 * Call the device specific close. This cannot fail.
1247 * Only if device is UP
1249 * We allow it to be called even after a DETACH hot-plug
1255 dev->flags &= ~IFF_UP;
1256 net_dmaengine_put();
1262 static int __dev_close(struct net_device *dev)
1267 list_add(&dev->unreg_list, &single);
1268 retval = __dev_close_many(&single);
1273 static int dev_close_many(struct list_head *head)
1275 struct net_device *dev, *tmp;
1276 LIST_HEAD(tmp_list);
1278 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1279 if (!(dev->flags & IFF_UP))
1280 list_move(&dev->unreg_list, &tmp_list);
1282 __dev_close_many(head);
1284 list_for_each_entry(dev, head, unreg_list) {
1285 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1286 call_netdevice_notifiers(NETDEV_DOWN, dev);
1289 /* rollback_registered_many needs the complete original list */
1290 list_splice(&tmp_list, head);
1295 * dev_close - shutdown an interface.
1296 * @dev: device to shutdown
1298 * This function moves an active device into down state. A
1299 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1300 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1303 int dev_close(struct net_device *dev)
1305 if (dev->flags & IFF_UP) {
1308 list_add(&dev->unreg_list, &single);
1309 dev_close_many(&single);
1314 EXPORT_SYMBOL(dev_close);
1318 * dev_disable_lro - disable Large Receive Offload on a device
1321 * Disable Large Receive Offload (LRO) on a net device. Must be
1322 * called under RTNL. This is needed if received packets may be
1323 * forwarded to another interface.
1325 void dev_disable_lro(struct net_device *dev)
1330 * If we're trying to disable lro on a vlan device
1331 * use the underlying physical device instead
1333 if (is_vlan_dev(dev))
1334 dev = vlan_dev_real_dev(dev);
1336 if (dev->ethtool_ops && dev->ethtool_ops->get_flags)
1337 flags = dev->ethtool_ops->get_flags(dev);
1339 flags = ethtool_op_get_flags(dev);
1341 if (!(flags & ETH_FLAG_LRO))
1344 __ethtool_set_flags(dev, flags & ~ETH_FLAG_LRO);
1345 if (unlikely(dev->features & NETIF_F_LRO))
1346 netdev_WARN(dev, "failed to disable LRO!\n");
1348 EXPORT_SYMBOL(dev_disable_lro);
1351 static int dev_boot_phase = 1;
1354 * register_netdevice_notifier - register a network notifier block
1357 * Register a notifier to be called when network device events occur.
1358 * The notifier passed is linked into the kernel structures and must
1359 * not be reused until it has been unregistered. A negative errno code
1360 * is returned on a failure.
1362 * When registered all registration and up events are replayed
1363 * to the new notifier to allow device to have a race free
1364 * view of the network device list.
1367 int register_netdevice_notifier(struct notifier_block *nb)
1369 struct net_device *dev;
1370 struct net_device *last;
1375 err = raw_notifier_chain_register(&netdev_chain, nb);
1381 for_each_netdev(net, dev) {
1382 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1383 err = notifier_to_errno(err);
1387 if (!(dev->flags & IFF_UP))
1390 nb->notifier_call(nb, NETDEV_UP, dev);
1401 for_each_netdev(net, dev) {
1405 if (dev->flags & IFF_UP) {
1406 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1407 nb->notifier_call(nb, NETDEV_DOWN, dev);
1409 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1410 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1415 raw_notifier_chain_unregister(&netdev_chain, nb);
1418 EXPORT_SYMBOL(register_netdevice_notifier);
1421 * unregister_netdevice_notifier - unregister a network notifier block
1424 * Unregister a notifier previously registered by
1425 * register_netdevice_notifier(). The notifier is unlinked into the
1426 * kernel structures and may then be reused. A negative errno code
1427 * is returned on a failure.
1429 * After unregistering unregister and down device events are synthesized
1430 * for all devices on the device list to the removed notifier to remove
1431 * the need for special case cleanup code.
1434 int unregister_netdevice_notifier(struct notifier_block *nb)
1436 struct net_device *dev;
1441 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1446 for_each_netdev(net, dev) {
1447 if (dev->flags & IFF_UP) {
1448 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1449 nb->notifier_call(nb, NETDEV_DOWN, dev);
1451 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1452 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1459 EXPORT_SYMBOL(unregister_netdevice_notifier);
1462 * call_netdevice_notifiers - call all network notifier blocks
1463 * @val: value passed unmodified to notifier function
1464 * @dev: net_device pointer passed unmodified to notifier function
1466 * Call all network notifier blocks. Parameters and return value
1467 * are as for raw_notifier_call_chain().
1470 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1473 return raw_notifier_call_chain(&netdev_chain, val, dev);
1475 EXPORT_SYMBOL(call_netdevice_notifiers);
1477 /* When > 0 there are consumers of rx skb time stamps */
1478 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1480 void net_enable_timestamp(void)
1482 atomic_inc(&netstamp_needed);
1484 EXPORT_SYMBOL(net_enable_timestamp);
1486 void net_disable_timestamp(void)
1488 atomic_dec(&netstamp_needed);
1490 EXPORT_SYMBOL(net_disable_timestamp);
1492 static inline void net_timestamp_set(struct sk_buff *skb)
1494 if (atomic_read(&netstamp_needed))
1495 __net_timestamp(skb);
1497 skb->tstamp.tv64 = 0;
1500 static inline void net_timestamp_check(struct sk_buff *skb)
1502 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1503 __net_timestamp(skb);
1506 static int net_hwtstamp_validate(struct ifreq *ifr)
1508 struct hwtstamp_config cfg;
1509 enum hwtstamp_tx_types tx_type;
1510 enum hwtstamp_rx_filters rx_filter;
1511 int tx_type_valid = 0;
1512 int rx_filter_valid = 0;
1514 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1517 if (cfg.flags) /* reserved for future extensions */
1520 tx_type = cfg.tx_type;
1521 rx_filter = cfg.rx_filter;
1524 case HWTSTAMP_TX_OFF:
1525 case HWTSTAMP_TX_ON:
1526 case HWTSTAMP_TX_ONESTEP_SYNC:
1531 switch (rx_filter) {
1532 case HWTSTAMP_FILTER_NONE:
1533 case HWTSTAMP_FILTER_ALL:
1534 case HWTSTAMP_FILTER_SOME:
1535 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1536 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1537 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1538 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1539 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1540 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1541 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1542 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1543 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1544 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1545 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1546 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1547 rx_filter_valid = 1;
1551 if (!tx_type_valid || !rx_filter_valid)
1557 static inline bool is_skb_forwardable(struct net_device *dev,
1558 struct sk_buff *skb)
1562 if (!(dev->flags & IFF_UP))
1565 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1566 if (skb->len <= len)
1569 /* if TSO is enabled, we don't care about the length as the packet
1570 * could be forwarded without being segmented before
1572 if (skb_is_gso(skb))
1579 * dev_forward_skb - loopback an skb to another netif
1581 * @dev: destination network device
1582 * @skb: buffer to forward
1585 * NET_RX_SUCCESS (no congestion)
1586 * NET_RX_DROP (packet was dropped, but freed)
1588 * dev_forward_skb can be used for injecting an skb from the
1589 * start_xmit function of one device into the receive queue
1590 * of another device.
1592 * The receiving device may be in another namespace, so
1593 * we have to clear all information in the skb that could
1594 * impact namespace isolation.
1596 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1598 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1599 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1600 atomic_long_inc(&dev->rx_dropped);
1609 if (unlikely(!is_skb_forwardable(dev, skb))) {
1610 atomic_long_inc(&dev->rx_dropped);
1616 skb->tstamp.tv64 = 0;
1617 skb->pkt_type = PACKET_HOST;
1618 skb->protocol = eth_type_trans(skb, dev);
1619 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1623 nf_reset_trace(skb);
1624 return netif_rx(skb);
1626 EXPORT_SYMBOL_GPL(dev_forward_skb);
1628 static inline int deliver_skb(struct sk_buff *skb,
1629 struct packet_type *pt_prev,
1630 struct net_device *orig_dev)
1632 atomic_inc(&skb->users);
1633 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1636 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1638 if (!ptype->af_packet_priv || !skb->sk)
1641 if (ptype->id_match)
1642 return ptype->id_match(ptype, skb->sk);
1643 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1650 * Support routine. Sends outgoing frames to any network
1651 * taps currently in use.
1654 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1656 struct packet_type *ptype;
1657 struct sk_buff *skb2 = NULL;
1658 struct packet_type *pt_prev = NULL;
1661 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1662 /* Never send packets back to the socket
1663 * they originated from - MvS (miquels@drinkel.ow.org)
1665 if ((ptype->dev == dev || !ptype->dev) &&
1666 (!skb_loop_sk(ptype, skb))) {
1668 deliver_skb(skb2, pt_prev, skb->dev);
1673 skb2 = skb_clone(skb, GFP_ATOMIC);
1677 net_timestamp_set(skb2);
1679 /* skb->nh should be correctly
1680 set by sender, so that the second statement is
1681 just protection against buggy protocols.
1683 skb_reset_mac_header(skb2);
1685 if (skb_network_header(skb2) < skb2->data ||
1686 skb2->network_header > skb2->tail) {
1687 if (net_ratelimit())
1688 printk(KERN_CRIT "protocol %04x is "
1690 ntohs(skb2->protocol),
1692 skb_reset_network_header(skb2);
1695 skb2->transport_header = skb2->network_header;
1696 skb2->pkt_type = PACKET_OUTGOING;
1701 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1705 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1706 * @dev: Network device
1707 * @txq: number of queues available
1709 * If real_num_tx_queues is changed the tc mappings may no longer be
1710 * valid. To resolve this verify the tc mapping remains valid and if
1711 * not NULL the mapping. With no priorities mapping to this
1712 * offset/count pair it will no longer be used. In the worst case TC0
1713 * is invalid nothing can be done so disable priority mappings. If is
1714 * expected that drivers will fix this mapping if they can before
1715 * calling netif_set_real_num_tx_queues.
1717 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1720 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1722 /* If TC0 is invalidated disable TC mapping */
1723 if (tc->offset + tc->count > txq) {
1724 pr_warning("Number of in use tx queues changed "
1725 "invalidating tc mappings. Priority "
1726 "traffic classification disabled!\n");
1731 /* Invalidated prio to tc mappings set to TC0 */
1732 for (i = 1; i < TC_BITMASK + 1; i++) {
1733 int q = netdev_get_prio_tc_map(dev, i);
1735 tc = &dev->tc_to_txq[q];
1736 if (tc->offset + tc->count > txq) {
1737 pr_warning("Number of in use tx queues "
1738 "changed. Priority %i to tc "
1739 "mapping %i is no longer valid "
1740 "setting map to 0\n",
1742 netdev_set_prio_tc_map(dev, i, 0);
1748 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1749 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1751 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1755 if (txq < 1 || txq > dev->num_tx_queues)
1758 if (dev->reg_state == NETREG_REGISTERED ||
1759 dev->reg_state == NETREG_UNREGISTERING) {
1762 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1768 netif_setup_tc(dev, txq);
1770 if (txq < dev->real_num_tx_queues)
1771 qdisc_reset_all_tx_gt(dev, txq);
1774 dev->real_num_tx_queues = txq;
1777 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1781 * netif_set_real_num_rx_queues - set actual number of RX queues used
1782 * @dev: Network device
1783 * @rxq: Actual number of RX queues
1785 * This must be called either with the rtnl_lock held or before
1786 * registration of the net device. Returns 0 on success, or a
1787 * negative error code. If called before registration, it always
1790 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1794 if (rxq < 1 || rxq > dev->num_rx_queues)
1797 if (dev->reg_state == NETREG_REGISTERED) {
1800 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1806 dev->real_num_rx_queues = rxq;
1809 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1812 static inline void __netif_reschedule(struct Qdisc *q)
1814 struct softnet_data *sd;
1815 unsigned long flags;
1817 local_irq_save(flags);
1818 sd = &__get_cpu_var(softnet_data);
1819 q->next_sched = NULL;
1820 *sd->output_queue_tailp = q;
1821 sd->output_queue_tailp = &q->next_sched;
1822 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1823 local_irq_restore(flags);
1826 void __netif_schedule(struct Qdisc *q)
1828 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1829 __netif_reschedule(q);
1831 EXPORT_SYMBOL(__netif_schedule);
1833 void dev_kfree_skb_irq(struct sk_buff *skb)
1835 if (atomic_dec_and_test(&skb->users)) {
1836 struct softnet_data *sd;
1837 unsigned long flags;
1839 local_irq_save(flags);
1840 sd = &__get_cpu_var(softnet_data);
1841 skb->next = sd->completion_queue;
1842 sd->completion_queue = skb;
1843 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1844 local_irq_restore(flags);
1847 EXPORT_SYMBOL(dev_kfree_skb_irq);
1849 void dev_kfree_skb_any(struct sk_buff *skb)
1851 if (in_irq() || irqs_disabled())
1852 dev_kfree_skb_irq(skb);
1856 EXPORT_SYMBOL(dev_kfree_skb_any);
1860 * netif_device_detach - mark device as removed
1861 * @dev: network device
1863 * Mark device as removed from system and therefore no longer available.
1865 void netif_device_detach(struct net_device *dev)
1867 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1868 netif_running(dev)) {
1869 netif_tx_stop_all_queues(dev);
1872 EXPORT_SYMBOL(netif_device_detach);
1875 * netif_device_attach - mark device as attached
1876 * @dev: network device
1878 * Mark device as attached from system and restart if needed.
1880 void netif_device_attach(struct net_device *dev)
1882 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1883 netif_running(dev)) {
1884 netif_tx_wake_all_queues(dev);
1885 __netdev_watchdog_up(dev);
1888 EXPORT_SYMBOL(netif_device_attach);
1891 * Invalidate hardware checksum when packet is to be mangled, and
1892 * complete checksum manually on outgoing path.
1894 int skb_checksum_help(struct sk_buff *skb)
1897 int ret = 0, offset;
1899 if (skb->ip_summed == CHECKSUM_COMPLETE)
1900 goto out_set_summed;
1902 if (unlikely(skb_shinfo(skb)->gso_size)) {
1903 /* Let GSO fix up the checksum. */
1904 goto out_set_summed;
1907 offset = skb_checksum_start_offset(skb);
1908 BUG_ON(offset >= skb_headlen(skb));
1909 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1911 offset += skb->csum_offset;
1912 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1914 if (skb_cloned(skb) &&
1915 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1916 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1921 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1923 skb->ip_summed = CHECKSUM_NONE;
1927 EXPORT_SYMBOL(skb_checksum_help);
1930 * skb_gso_segment - Perform segmentation on skb.
1931 * @skb: buffer to segment
1932 * @features: features for the output path (see dev->features)
1934 * This function segments the given skb and returns a list of segments.
1936 * It may return NULL if the skb requires no segmentation. This is
1937 * only possible when GSO is used for verifying header integrity.
1939 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1941 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1942 struct packet_type *ptype;
1943 __be16 type = skb->protocol;
1944 int vlan_depth = ETH_HLEN;
1947 while (type == htons(ETH_P_8021Q)) {
1948 struct vlan_hdr *vh;
1950 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1951 return ERR_PTR(-EINVAL);
1953 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1954 type = vh->h_vlan_encapsulated_proto;
1955 vlan_depth += VLAN_HLEN;
1958 skb_reset_mac_header(skb);
1959 skb->mac_len = skb->network_header - skb->mac_header;
1960 __skb_pull(skb, skb->mac_len);
1962 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1963 struct net_device *dev = skb->dev;
1964 struct ethtool_drvinfo info = {};
1966 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1967 dev->ethtool_ops->get_drvinfo(dev, &info);
1969 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1970 info.driver, dev ? dev->features : 0L,
1971 skb->sk ? skb->sk->sk_route_caps : 0L,
1972 skb->len, skb->data_len, skb->ip_summed);
1974 if (skb_header_cloned(skb) &&
1975 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1976 return ERR_PTR(err);
1980 list_for_each_entry_rcu(ptype,
1981 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1982 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1983 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1984 err = ptype->gso_send_check(skb);
1985 segs = ERR_PTR(err);
1986 if (err || skb_gso_ok(skb, features))
1988 __skb_push(skb, (skb->data -
1989 skb_network_header(skb)));
1991 segs = ptype->gso_segment(skb, features);
1997 __skb_push(skb, skb->data - skb_mac_header(skb));
2001 EXPORT_SYMBOL(skb_gso_segment);
2003 /* Take action when hardware reception checksum errors are detected. */
2005 void netdev_rx_csum_fault(struct net_device *dev)
2007 if (net_ratelimit()) {
2008 printk(KERN_ERR "%s: hw csum failure.\n",
2009 dev ? dev->name : "<unknown>");
2013 EXPORT_SYMBOL(netdev_rx_csum_fault);
2016 /* Actually, we should eliminate this check as soon as we know, that:
2017 * 1. IOMMU is present and allows to map all the memory.
2018 * 2. No high memory really exists on this machine.
2021 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2023 #ifdef CONFIG_HIGHMEM
2025 if (!(dev->features & NETIF_F_HIGHDMA)) {
2026 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2027 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2028 if (PageHighMem(skb_frag_page(frag)))
2033 if (PCI_DMA_BUS_IS_PHYS) {
2034 struct device *pdev = dev->dev.parent;
2038 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2039 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2040 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2041 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2050 void (*destructor)(struct sk_buff *skb);
2053 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2055 static void dev_gso_skb_destructor(struct sk_buff *skb)
2057 struct dev_gso_cb *cb;
2060 struct sk_buff *nskb = skb->next;
2062 skb->next = nskb->next;
2065 } while (skb->next);
2067 cb = DEV_GSO_CB(skb);
2069 cb->destructor(skb);
2073 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2074 * @skb: buffer to segment
2075 * @features: device features as applicable to this skb
2077 * This function segments the given skb and stores the list of segments
2080 static int dev_gso_segment(struct sk_buff *skb, int features)
2082 struct sk_buff *segs;
2084 segs = skb_gso_segment(skb, features);
2086 /* Verifying header integrity only. */
2091 return PTR_ERR(segs);
2094 DEV_GSO_CB(skb)->destructor = skb->destructor;
2095 skb->destructor = dev_gso_skb_destructor;
2100 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2102 return ((features & NETIF_F_GEN_CSUM) ||
2103 ((features & NETIF_F_V4_CSUM) &&
2104 protocol == htons(ETH_P_IP)) ||
2105 ((features & NETIF_F_V6_CSUM) &&
2106 protocol == htons(ETH_P_IPV6)) ||
2107 ((features & NETIF_F_FCOE_CRC) &&
2108 protocol == htons(ETH_P_FCOE)));
2111 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2113 if (skb->ip_summed != CHECKSUM_NONE &&
2114 !can_checksum_protocol(features, protocol)) {
2115 features &= ~NETIF_F_ALL_CSUM;
2116 features &= ~NETIF_F_SG;
2117 } else if (illegal_highdma(skb->dev, skb)) {
2118 features &= ~NETIF_F_SG;
2124 u32 netif_skb_features(struct sk_buff *skb)
2126 __be16 protocol = skb->protocol;
2127 u32 features = skb->dev->features;
2129 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2130 features &= ~NETIF_F_GSO_MASK;
2132 if (!vlan_tx_tag_present(skb)) {
2133 if (unlikely(protocol == htons(ETH_P_8021Q))) {
2134 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2135 protocol = veh->h_vlan_encapsulated_proto;
2137 return harmonize_features(skb, protocol, features);
2141 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2143 if (protocol != htons(ETH_P_8021Q)) {
2144 return harmonize_features(skb, protocol, features);
2146 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2147 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2148 return harmonize_features(skb, protocol, features);
2151 EXPORT_SYMBOL(netif_skb_features);
2154 * Returns true if either:
2155 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2156 * 2. skb is fragmented and the device does not support SG, or if
2157 * at least one of fragments is in highmem and device does not
2158 * support DMA from it.
2160 static inline int skb_needs_linearize(struct sk_buff *skb,
2163 return skb_is_nonlinear(skb) &&
2164 ((skb_has_frag_list(skb) &&
2165 !(features & NETIF_F_FRAGLIST)) ||
2166 (skb_shinfo(skb)->nr_frags &&
2167 !(features & NETIF_F_SG)));
2170 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2171 struct netdev_queue *txq)
2173 const struct net_device_ops *ops = dev->netdev_ops;
2174 int rc = NETDEV_TX_OK;
2175 unsigned int skb_len;
2177 if (likely(!skb->next)) {
2181 * If device doesn't need skb->dst, release it right now while
2182 * its hot in this cpu cache
2184 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2187 if (!list_empty(&ptype_all))
2188 dev_queue_xmit_nit(skb, dev);
2190 features = netif_skb_features(skb);
2192 if (vlan_tx_tag_present(skb) &&
2193 !(features & NETIF_F_HW_VLAN_TX)) {
2194 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2201 if (netif_needs_gso(skb, features)) {
2202 if (unlikely(dev_gso_segment(skb, features)))
2207 if (skb_needs_linearize(skb, features) &&
2208 __skb_linearize(skb))
2211 /* If packet is not checksummed and device does not
2212 * support checksumming for this protocol, complete
2213 * checksumming here.
2215 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2216 skb_set_transport_header(skb,
2217 skb_checksum_start_offset(skb));
2218 if (!(features & NETIF_F_ALL_CSUM) &&
2219 skb_checksum_help(skb))
2225 rc = ops->ndo_start_xmit(skb, dev);
2226 trace_net_dev_xmit(skb, rc, dev, skb_len);
2227 if (rc == NETDEV_TX_OK)
2228 txq_trans_update(txq);
2234 struct sk_buff *nskb = skb->next;
2236 skb->next = nskb->next;
2240 * If device doesn't need nskb->dst, release it right now while
2241 * its hot in this cpu cache
2243 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2246 skb_len = nskb->len;
2247 rc = ops->ndo_start_xmit(nskb, dev);
2248 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2249 if (unlikely(rc != NETDEV_TX_OK)) {
2250 if (rc & ~NETDEV_TX_MASK)
2251 goto out_kfree_gso_skb;
2252 nskb->next = skb->next;
2256 txq_trans_update(txq);
2257 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2258 return NETDEV_TX_BUSY;
2259 } while (skb->next);
2262 if (likely(skb->next == NULL))
2263 skb->destructor = DEV_GSO_CB(skb)->destructor;
2270 static u32 hashrnd __read_mostly;
2273 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2274 * to be used as a distribution range.
2276 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2277 unsigned int num_tx_queues)
2281 u16 qcount = num_tx_queues;
2283 if (skb_rx_queue_recorded(skb)) {
2284 hash = skb_get_rx_queue(skb);
2285 while (unlikely(hash >= num_tx_queues))
2286 hash -= num_tx_queues;
2291 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2292 qoffset = dev->tc_to_txq[tc].offset;
2293 qcount = dev->tc_to_txq[tc].count;
2296 if (skb->sk && skb->sk->sk_hash)
2297 hash = skb->sk->sk_hash;
2299 hash = (__force u16) skb->protocol;
2300 hash = jhash_1word(hash, hashrnd);
2302 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2304 EXPORT_SYMBOL(__skb_tx_hash);
2306 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2308 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2309 if (net_ratelimit()) {
2310 pr_warning("%s selects TX queue %d, but "
2311 "real number of TX queues is %d\n",
2312 dev->name, queue_index, dev->real_num_tx_queues);
2319 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2322 struct xps_dev_maps *dev_maps;
2323 struct xps_map *map;
2324 int queue_index = -1;
2327 dev_maps = rcu_dereference(dev->xps_maps);
2329 map = rcu_dereference(
2330 dev_maps->cpu_map[raw_smp_processor_id()]);
2333 queue_index = map->queues[0];
2336 if (skb->sk && skb->sk->sk_hash)
2337 hash = skb->sk->sk_hash;
2339 hash = (__force u16) skb->protocol ^
2341 hash = jhash_1word(hash, hashrnd);
2342 queue_index = map->queues[
2343 ((u64)hash * map->len) >> 32];
2345 if (unlikely(queue_index >= dev->real_num_tx_queues))
2357 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2358 struct sk_buff *skb)
2361 const struct net_device_ops *ops = dev->netdev_ops;
2363 if (dev->real_num_tx_queues == 1)
2365 else if (ops->ndo_select_queue) {
2366 queue_index = ops->ndo_select_queue(dev, skb);
2367 queue_index = dev_cap_txqueue(dev, queue_index);
2369 struct sock *sk = skb->sk;
2370 queue_index = sk_tx_queue_get(sk);
2372 if (queue_index < 0 || skb->ooo_okay ||
2373 queue_index >= dev->real_num_tx_queues) {
2374 int old_index = queue_index;
2376 queue_index = get_xps_queue(dev, skb);
2377 if (queue_index < 0)
2378 queue_index = skb_tx_hash(dev, skb);
2380 if (queue_index != old_index && sk) {
2381 struct dst_entry *dst =
2382 rcu_dereference_check(sk->sk_dst_cache, 1);
2384 if (dst && skb_dst(skb) == dst)
2385 sk_tx_queue_set(sk, queue_index);
2390 skb_set_queue_mapping(skb, queue_index);
2391 return netdev_get_tx_queue(dev, queue_index);
2394 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2395 struct net_device *dev,
2396 struct netdev_queue *txq)
2398 spinlock_t *root_lock = qdisc_lock(q);
2402 qdisc_skb_cb(skb)->pkt_len = skb->len;
2403 qdisc_calculate_pkt_len(skb, q);
2405 * Heuristic to force contended enqueues to serialize on a
2406 * separate lock before trying to get qdisc main lock.
2407 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2408 * and dequeue packets faster.
2410 contended = qdisc_is_running(q);
2411 if (unlikely(contended))
2412 spin_lock(&q->busylock);
2414 spin_lock(root_lock);
2415 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2418 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2419 qdisc_run_begin(q)) {
2421 * This is a work-conserving queue; there are no old skbs
2422 * waiting to be sent out; and the qdisc is not running -
2423 * xmit the skb directly.
2425 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2428 qdisc_bstats_update(q, skb);
2430 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2431 if (unlikely(contended)) {
2432 spin_unlock(&q->busylock);
2439 rc = NET_XMIT_SUCCESS;
2442 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2443 if (qdisc_run_begin(q)) {
2444 if (unlikely(contended)) {
2445 spin_unlock(&q->busylock);
2451 spin_unlock(root_lock);
2452 if (unlikely(contended))
2453 spin_unlock(&q->busylock);
2457 static DEFINE_PER_CPU(int, xmit_recursion);
2458 #define RECURSION_LIMIT 10
2461 * dev_queue_xmit - transmit a buffer
2462 * @skb: buffer to transmit
2464 * Queue a buffer for transmission to a network device. The caller must
2465 * have set the device and priority and built the buffer before calling
2466 * this function. The function can be called from an interrupt.
2468 * A negative errno code is returned on a failure. A success does not
2469 * guarantee the frame will be transmitted as it may be dropped due
2470 * to congestion or traffic shaping.
2472 * -----------------------------------------------------------------------------------
2473 * I notice this method can also return errors from the queue disciplines,
2474 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2477 * Regardless of the return value, the skb is consumed, so it is currently
2478 * difficult to retry a send to this method. (You can bump the ref count
2479 * before sending to hold a reference for retry if you are careful.)
2481 * When calling this method, interrupts MUST be enabled. This is because
2482 * the BH enable code must have IRQs enabled so that it will not deadlock.
2485 int dev_queue_xmit(struct sk_buff *skb)
2487 struct net_device *dev = skb->dev;
2488 struct netdev_queue *txq;
2492 /* Disable soft irqs for various locks below. Also
2493 * stops preemption for RCU.
2497 txq = dev_pick_tx(dev, skb);
2498 q = rcu_dereference_bh(txq->qdisc);
2500 #ifdef CONFIG_NET_CLS_ACT
2501 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2503 trace_net_dev_queue(skb);
2505 rc = __dev_xmit_skb(skb, q, dev, txq);
2509 /* The device has no queue. Common case for software devices:
2510 loopback, all the sorts of tunnels...
2512 Really, it is unlikely that netif_tx_lock protection is necessary
2513 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2515 However, it is possible, that they rely on protection
2518 Check this and shot the lock. It is not prone from deadlocks.
2519 Either shot noqueue qdisc, it is even simpler 8)
2521 if (dev->flags & IFF_UP) {
2522 int cpu = smp_processor_id(); /* ok because BHs are off */
2524 if (txq->xmit_lock_owner != cpu) {
2526 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2527 goto recursion_alert;
2529 HARD_TX_LOCK(dev, txq, cpu);
2531 if (!netif_tx_queue_stopped(txq)) {
2532 __this_cpu_inc(xmit_recursion);
2533 rc = dev_hard_start_xmit(skb, dev, txq);
2534 __this_cpu_dec(xmit_recursion);
2535 if (dev_xmit_complete(rc)) {
2536 HARD_TX_UNLOCK(dev, txq);
2540 HARD_TX_UNLOCK(dev, txq);
2541 if (net_ratelimit())
2542 printk(KERN_CRIT "Virtual device %s asks to "
2543 "queue packet!\n", dev->name);
2545 /* Recursion is detected! It is possible,
2549 if (net_ratelimit())
2550 printk(KERN_CRIT "Dead loop on virtual device "
2551 "%s, fix it urgently!\n", dev->name);
2556 rcu_read_unlock_bh();
2561 rcu_read_unlock_bh();
2564 EXPORT_SYMBOL(dev_queue_xmit);
2567 /*=======================================================================
2569 =======================================================================*/
2571 int netdev_max_backlog __read_mostly = 1000;
2572 int netdev_tstamp_prequeue __read_mostly = 1;
2573 int netdev_budget __read_mostly = 300;
2574 int weight_p __read_mostly = 64; /* old backlog weight */
2576 /* Called with irq disabled */
2577 static inline void ____napi_schedule(struct softnet_data *sd,
2578 struct napi_struct *napi)
2580 list_add_tail(&napi->poll_list, &sd->poll_list);
2581 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2585 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2586 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2587 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2588 * if hash is a canonical 4-tuple hash over transport ports.
2590 void __skb_get_rxhash(struct sk_buff *skb)
2592 int nhoff, hash = 0, poff;
2593 const struct ipv6hdr *ip6;
2594 const struct iphdr *ip;
2595 const struct vlan_hdr *vlan;
2604 nhoff = skb_network_offset(skb);
2605 proto = skb->protocol;
2609 case __constant_htons(ETH_P_IP):
2611 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2614 ip = (const struct iphdr *) (skb->data + nhoff);
2617 if (ip_is_fragment(ip))
2620 ip_proto = ip->protocol;
2621 addr1 = (__force u32) ip->saddr;
2622 addr2 = (__force u32) ip->daddr;
2623 nhoff += ip->ihl * 4;
2625 case __constant_htons(ETH_P_IPV6):
2627 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2630 ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
2631 ip_proto = ip6->nexthdr;
2632 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2633 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2636 case __constant_htons(ETH_P_8021Q):
2637 if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
2639 vlan = (const struct vlan_hdr *) (skb->data + nhoff);
2640 proto = vlan->h_vlan_encapsulated_proto;
2641 nhoff += sizeof(*vlan);
2643 case __constant_htons(ETH_P_PPP_SES):
2644 if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
2646 proto = *((__be16 *) (skb->data + nhoff +
2647 sizeof(struct pppoe_hdr)));
2648 nhoff += PPPOE_SES_HLEN;
2650 case __constant_htons(PPP_IP):
2652 case __constant_htons(PPP_IPV6):
2663 if (pskb_may_pull(skb, nhoff + 16)) {
2664 u8 *h = skb->data + nhoff;
2665 __be16 flags = *(__be16 *)h;
2668 * Only look inside GRE if version zero and no
2671 if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
2672 proto = *(__be16 *)(h + 2);
2674 if (flags & GRE_CSUM)
2676 if (flags & GRE_KEY)
2678 if (flags & GRE_SEQ)
2691 poff = proto_ports_offset(ip_proto);
2694 if (pskb_may_pull(skb, nhoff + 4)) {
2695 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2700 /* get a consistent hash (same value on both flow directions) */
2701 if (addr2 < addr1 ||
2703 ports.v16[1] < ports.v16[0])) {
2705 swap(ports.v16[0], ports.v16[1]);
2707 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2714 EXPORT_SYMBOL(__skb_get_rxhash);
2718 /* One global table that all flow-based protocols share. */
2719 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2720 EXPORT_SYMBOL(rps_sock_flow_table);
2722 static struct rps_dev_flow *
2723 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2724 struct rps_dev_flow *rflow, u16 next_cpu)
2726 if (next_cpu != RPS_NO_CPU) {
2727 #ifdef CONFIG_RFS_ACCEL
2728 struct netdev_rx_queue *rxqueue;
2729 struct rps_dev_flow_table *flow_table;
2730 struct rps_dev_flow *old_rflow;
2735 /* Should we steer this flow to a different hardware queue? */
2736 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2737 !(dev->features & NETIF_F_NTUPLE))
2739 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2740 if (rxq_index == skb_get_rx_queue(skb))
2743 rxqueue = dev->_rx + rxq_index;
2744 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2747 flow_id = skb->rxhash & flow_table->mask;
2748 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2749 rxq_index, flow_id);
2753 rflow = &flow_table->flows[flow_id];
2755 if (old_rflow->filter == rflow->filter)
2756 old_rflow->filter = RPS_NO_FILTER;
2760 per_cpu(softnet_data, next_cpu).input_queue_head;
2763 rflow->cpu = next_cpu;
2768 * get_rps_cpu is called from netif_receive_skb and returns the target
2769 * CPU from the RPS map of the receiving queue for a given skb.
2770 * rcu_read_lock must be held on entry.
2772 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2773 struct rps_dev_flow **rflowp)
2775 struct netdev_rx_queue *rxqueue;
2776 struct rps_map *map;
2777 struct rps_dev_flow_table *flow_table;
2778 struct rps_sock_flow_table *sock_flow_table;
2782 if (skb_rx_queue_recorded(skb)) {
2783 u16 index = skb_get_rx_queue(skb);
2784 if (unlikely(index >= dev->real_num_rx_queues)) {
2785 WARN_ONCE(dev->real_num_rx_queues > 1,
2786 "%s received packet on queue %u, but number "
2787 "of RX queues is %u\n",
2788 dev->name, index, dev->real_num_rx_queues);
2791 rxqueue = dev->_rx + index;
2795 map = rcu_dereference(rxqueue->rps_map);
2797 if (map->len == 1 &&
2798 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2799 tcpu = map->cpus[0];
2800 if (cpu_online(tcpu))
2804 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2808 skb_reset_network_header(skb);
2809 if (!skb_get_rxhash(skb))
2812 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2813 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2814 if (flow_table && sock_flow_table) {
2816 struct rps_dev_flow *rflow;
2818 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2821 next_cpu = sock_flow_table->ents[skb->rxhash &
2822 sock_flow_table->mask];
2825 * If the desired CPU (where last recvmsg was done) is
2826 * different from current CPU (one in the rx-queue flow
2827 * table entry), switch if one of the following holds:
2828 * - Current CPU is unset (equal to RPS_NO_CPU).
2829 * - Current CPU is offline.
2830 * - The current CPU's queue tail has advanced beyond the
2831 * last packet that was enqueued using this table entry.
2832 * This guarantees that all previous packets for the flow
2833 * have been dequeued, thus preserving in order delivery.
2835 if (unlikely(tcpu != next_cpu) &&
2836 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2837 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2838 rflow->last_qtail)) >= 0)) {
2840 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2843 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2851 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2853 if (cpu_online(tcpu)) {
2863 #ifdef CONFIG_RFS_ACCEL
2866 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2867 * @dev: Device on which the filter was set
2868 * @rxq_index: RX queue index
2869 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2870 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2872 * Drivers that implement ndo_rx_flow_steer() should periodically call
2873 * this function for each installed filter and remove the filters for
2874 * which it returns %true.
2876 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2877 u32 flow_id, u16 filter_id)
2879 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2880 struct rps_dev_flow_table *flow_table;
2881 struct rps_dev_flow *rflow;
2886 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2887 if (flow_table && flow_id <= flow_table->mask) {
2888 rflow = &flow_table->flows[flow_id];
2889 cpu = ACCESS_ONCE(rflow->cpu);
2890 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2891 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2892 rflow->last_qtail) <
2893 (int)(10 * flow_table->mask)))
2899 EXPORT_SYMBOL(rps_may_expire_flow);
2901 #endif /* CONFIG_RFS_ACCEL */
2903 /* Called from hardirq (IPI) context */
2904 static void rps_trigger_softirq(void *data)
2906 struct softnet_data *sd = data;
2908 ____napi_schedule(sd, &sd->backlog);
2912 #endif /* CONFIG_RPS */
2915 * Check if this softnet_data structure is another cpu one
2916 * If yes, queue it to our IPI list and return 1
2919 static int rps_ipi_queued(struct softnet_data *sd)
2922 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2925 sd->rps_ipi_next = mysd->rps_ipi_list;
2926 mysd->rps_ipi_list = sd;
2928 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2931 #endif /* CONFIG_RPS */
2936 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2937 * queue (may be a remote CPU queue).
2939 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2940 unsigned int *qtail)
2942 struct softnet_data *sd;
2943 unsigned long flags;
2945 sd = &per_cpu(softnet_data, cpu);
2947 local_irq_save(flags);
2950 if (!netif_running(skb->dev))
2952 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2953 if (skb_queue_len(&sd->input_pkt_queue)) {
2955 __skb_queue_tail(&sd->input_pkt_queue, skb);
2956 input_queue_tail_incr_save(sd, qtail);
2958 local_irq_restore(flags);
2959 return NET_RX_SUCCESS;
2962 /* Schedule NAPI for backlog device
2963 * We can use non atomic operation since we own the queue lock
2965 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2966 if (!rps_ipi_queued(sd))
2967 ____napi_schedule(sd, &sd->backlog);
2976 local_irq_restore(flags);
2978 atomic_long_inc(&skb->dev->rx_dropped);
2984 * netif_rx - post buffer to the network code
2985 * @skb: buffer to post
2987 * This function receives a packet from a device driver and queues it for
2988 * the upper (protocol) levels to process. It always succeeds. The buffer
2989 * may be dropped during processing for congestion control or by the
2993 * NET_RX_SUCCESS (no congestion)
2994 * NET_RX_DROP (packet was dropped)
2998 int netif_rx(struct sk_buff *skb)
3002 /* if netpoll wants it, pretend we never saw it */
3003 if (netpoll_rx(skb))
3006 if (netdev_tstamp_prequeue)
3007 net_timestamp_check(skb);
3009 trace_netif_rx(skb);
3012 struct rps_dev_flow voidflow, *rflow = &voidflow;
3018 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3020 cpu = smp_processor_id();
3022 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3030 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3036 EXPORT_SYMBOL(netif_rx);
3038 int netif_rx_ni(struct sk_buff *skb)
3043 err = netif_rx(skb);
3044 if (local_softirq_pending())
3050 EXPORT_SYMBOL(netif_rx_ni);
3052 static void net_tx_action(struct softirq_action *h)
3054 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3056 if (sd->completion_queue) {
3057 struct sk_buff *clist;
3059 local_irq_disable();
3060 clist = sd->completion_queue;
3061 sd->completion_queue = NULL;
3065 struct sk_buff *skb = clist;
3066 clist = clist->next;
3068 WARN_ON(atomic_read(&skb->users));
3069 trace_kfree_skb(skb, net_tx_action);
3074 if (sd->output_queue) {
3077 local_irq_disable();
3078 head = sd->output_queue;
3079 sd->output_queue = NULL;
3080 sd->output_queue_tailp = &sd->output_queue;
3084 struct Qdisc *q = head;
3085 spinlock_t *root_lock;
3087 head = head->next_sched;
3089 root_lock = qdisc_lock(q);
3090 if (spin_trylock(root_lock)) {
3091 smp_mb__before_clear_bit();
3092 clear_bit(__QDISC_STATE_SCHED,
3095 spin_unlock(root_lock);
3097 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3099 __netif_reschedule(q);
3101 smp_mb__before_clear_bit();
3102 clear_bit(__QDISC_STATE_SCHED,
3110 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3111 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3112 /* This hook is defined here for ATM LANE */
3113 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3114 unsigned char *addr) __read_mostly;
3115 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3118 #ifdef CONFIG_NET_CLS_ACT
3119 /* TODO: Maybe we should just force sch_ingress to be compiled in
3120 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3121 * a compare and 2 stores extra right now if we dont have it on
3122 * but have CONFIG_NET_CLS_ACT
3123 * NOTE: This doesn't stop any functionality; if you dont have
3124 * the ingress scheduler, you just can't add policies on ingress.
3127 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3129 struct net_device *dev = skb->dev;
3130 u32 ttl = G_TC_RTTL(skb->tc_verd);
3131 int result = TC_ACT_OK;
3134 if (unlikely(MAX_RED_LOOP < ttl++)) {
3135 if (net_ratelimit())
3136 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3137 skb->skb_iif, dev->ifindex);
3141 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3142 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3145 if (q != &noop_qdisc) {
3146 spin_lock(qdisc_lock(q));
3147 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3148 result = qdisc_enqueue_root(skb, q);
3149 spin_unlock(qdisc_lock(q));
3155 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3156 struct packet_type **pt_prev,
3157 int *ret, struct net_device *orig_dev)
3159 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3161 if (!rxq || rxq->qdisc == &noop_qdisc)
3165 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3169 switch (ing_filter(skb, rxq)) {
3183 * netdev_rx_handler_register - register receive handler
3184 * @dev: device to register a handler for
3185 * @rx_handler: receive handler to register
3186 * @rx_handler_data: data pointer that is used by rx handler
3188 * Register a receive hander for a device. This handler will then be
3189 * called from __netif_receive_skb. A negative errno code is returned
3192 * The caller must hold the rtnl_mutex.
3194 * For a general description of rx_handler, see enum rx_handler_result.
3196 int netdev_rx_handler_register(struct net_device *dev,
3197 rx_handler_func_t *rx_handler,
3198 void *rx_handler_data)
3202 if (dev->rx_handler)
3205 /* Note: rx_handler_data must be set before rx_handler */
3206 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3207 rcu_assign_pointer(dev->rx_handler, rx_handler);
3211 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3214 * netdev_rx_handler_unregister - unregister receive handler
3215 * @dev: device to unregister a handler from
3217 * Unregister a receive hander from a device.
3219 * The caller must hold the rtnl_mutex.
3221 void netdev_rx_handler_unregister(struct net_device *dev)
3225 RCU_INIT_POINTER(dev->rx_handler, NULL);
3226 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3227 * section has a guarantee to see a non NULL rx_handler_data
3231 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3233 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3235 static int __netif_receive_skb(struct sk_buff *skb)
3237 struct packet_type *ptype, *pt_prev;
3238 rx_handler_func_t *rx_handler;
3239 struct net_device *orig_dev;
3240 struct net_device *null_or_dev;
3241 bool deliver_exact = false;
3242 int ret = NET_RX_DROP;
3245 if (!netdev_tstamp_prequeue)
3246 net_timestamp_check(skb);
3248 trace_netif_receive_skb(skb);
3250 /* if we've gotten here through NAPI, check netpoll */
3251 if (netpoll_receive_skb(skb))
3255 skb->skb_iif = skb->dev->ifindex;
3256 orig_dev = skb->dev;
3258 skb_reset_network_header(skb);
3259 skb_reset_transport_header(skb);
3260 skb_reset_mac_len(skb);
3266 __this_cpu_inc(softnet_data.processed);
3268 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3269 skb = vlan_untag(skb);
3274 #ifdef CONFIG_NET_CLS_ACT
3275 if (skb->tc_verd & TC_NCLS) {
3276 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3281 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3282 if (!ptype->dev || ptype->dev == skb->dev) {
3284 ret = deliver_skb(skb, pt_prev, orig_dev);
3289 #ifdef CONFIG_NET_CLS_ACT
3290 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3296 if (vlan_tx_tag_present(skb)) {
3298 ret = deliver_skb(skb, pt_prev, orig_dev);
3301 if (vlan_do_receive(&skb))
3303 else if (unlikely(!skb))
3307 rx_handler = rcu_dereference(skb->dev->rx_handler);
3310 ret = deliver_skb(skb, pt_prev, orig_dev);
3313 switch (rx_handler(&skb)) {
3314 case RX_HANDLER_CONSUMED:
3315 ret = NET_RX_SUCCESS;
3317 case RX_HANDLER_ANOTHER:
3319 case RX_HANDLER_EXACT:
3320 deliver_exact = true;
3321 case RX_HANDLER_PASS:
3328 if (vlan_tx_nonzero_tag_present(skb))
3329 skb->pkt_type = PACKET_OTHERHOST;
3331 /* deliver only exact match when indicated */
3332 null_or_dev = deliver_exact ? skb->dev : NULL;
3334 type = skb->protocol;
3335 list_for_each_entry_rcu(ptype,
3336 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3337 if (ptype->type == type &&
3338 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3339 ptype->dev == orig_dev)) {
3341 ret = deliver_skb(skb, pt_prev, orig_dev);
3347 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3349 atomic_long_inc(&skb->dev->rx_dropped);
3351 /* Jamal, now you will not able to escape explaining
3352 * me how you were going to use this. :-)
3362 * netif_receive_skb - process receive buffer from network
3363 * @skb: buffer to process
3365 * netif_receive_skb() is the main receive data processing function.
3366 * It always succeeds. The buffer may be dropped during processing
3367 * for congestion control or by the protocol layers.
3369 * This function may only be called from softirq context and interrupts
3370 * should be enabled.
3372 * Return values (usually ignored):
3373 * NET_RX_SUCCESS: no congestion
3374 * NET_RX_DROP: packet was dropped
3376 int netif_receive_skb(struct sk_buff *skb)
3380 if (netdev_tstamp_prequeue)
3381 net_timestamp_check(skb);
3383 if (skb_defer_rx_timestamp(skb))
3384 return NET_RX_SUCCESS;
3390 struct rps_dev_flow voidflow, *rflow = &voidflow;
3391 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
3394 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3400 ret = __netif_receive_skb(skb);
3404 EXPORT_SYMBOL(netif_receive_skb);
3406 /* Network device is going away, flush any packets still pending
3407 * Called with irqs disabled.
3409 static void flush_backlog(void *arg)
3411 struct net_device *dev = arg;
3412 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3413 struct sk_buff *skb, *tmp;
3416 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3417 if (skb->dev == dev) {
3418 __skb_unlink(skb, &sd->input_pkt_queue);
3420 input_queue_head_incr(sd);
3425 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3426 if (skb->dev == dev) {
3427 __skb_unlink(skb, &sd->process_queue);
3429 input_queue_head_incr(sd);
3434 static int napi_gro_complete(struct sk_buff *skb)
3436 struct packet_type *ptype;
3437 __be16 type = skb->protocol;
3438 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3441 if (NAPI_GRO_CB(skb)->count == 1) {
3442 skb_shinfo(skb)->gso_size = 0;
3447 list_for_each_entry_rcu(ptype, head, list) {
3448 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3451 err = ptype->gro_complete(skb);
3457 WARN_ON(&ptype->list == head);
3459 return NET_RX_SUCCESS;
3463 return netif_receive_skb(skb);
3466 inline void napi_gro_flush(struct napi_struct *napi)
3468 struct sk_buff *skb, *next;
3470 for (skb = napi->gro_list; skb; skb = next) {
3473 napi_gro_complete(skb);
3476 napi->gro_count = 0;
3477 napi->gro_list = NULL;
3479 EXPORT_SYMBOL(napi_gro_flush);
3481 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3483 struct sk_buff **pp = NULL;
3484 struct packet_type *ptype;
3485 __be16 type = skb->protocol;
3486 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3489 enum gro_result ret;
3491 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3494 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3498 list_for_each_entry_rcu(ptype, head, list) {
3499 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3502 skb_set_network_header(skb, skb_gro_offset(skb));
3503 mac_len = skb->network_header - skb->mac_header;
3504 skb->mac_len = mac_len;
3505 NAPI_GRO_CB(skb)->same_flow = 0;
3506 NAPI_GRO_CB(skb)->flush = 0;
3507 NAPI_GRO_CB(skb)->free = 0;
3509 pp = ptype->gro_receive(&napi->gro_list, skb);
3514 if (&ptype->list == head)
3517 same_flow = NAPI_GRO_CB(skb)->same_flow;
3518 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3521 struct sk_buff *nskb = *pp;
3525 napi_gro_complete(nskb);
3532 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3536 NAPI_GRO_CB(skb)->count = 1;
3537 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3538 skb->next = napi->gro_list;
3539 napi->gro_list = skb;
3543 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3544 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3546 BUG_ON(skb->end - skb->tail < grow);
3548 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3551 skb->data_len -= grow;
3553 skb_shinfo(skb)->frags[0].page_offset += grow;
3554 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3556 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3557 skb_frag_unref(skb, 0);
3558 memmove(skb_shinfo(skb)->frags,
3559 skb_shinfo(skb)->frags + 1,
3560 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3571 EXPORT_SYMBOL(dev_gro_receive);
3573 static inline gro_result_t
3574 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3577 unsigned int maclen = skb->dev->hard_header_len;
3579 for (p = napi->gro_list; p; p = p->next) {
3580 unsigned long diffs;
3582 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3583 diffs |= p->vlan_tci ^ skb->vlan_tci;
3584 if (maclen == ETH_HLEN)
3585 diffs |= compare_ether_header(skb_mac_header(p),
3586 skb_gro_mac_header(skb));
3588 diffs = memcmp(skb_mac_header(p),
3589 skb_gro_mac_header(skb),
3591 NAPI_GRO_CB(p)->same_flow = !diffs;
3592 NAPI_GRO_CB(p)->flush = 0;
3595 return dev_gro_receive(napi, skb);
3598 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3602 if (netif_receive_skb(skb))
3607 case GRO_MERGED_FREE:
3618 EXPORT_SYMBOL(napi_skb_finish);
3620 void skb_gro_reset_offset(struct sk_buff *skb)
3622 NAPI_GRO_CB(skb)->data_offset = 0;
3623 NAPI_GRO_CB(skb)->frag0 = NULL;
3624 NAPI_GRO_CB(skb)->frag0_len = 0;
3626 if (skb->mac_header == skb->tail &&
3627 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3628 NAPI_GRO_CB(skb)->frag0 =
3629 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3630 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3633 EXPORT_SYMBOL(skb_gro_reset_offset);
3635 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3637 skb_gro_reset_offset(skb);
3639 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3641 EXPORT_SYMBOL(napi_gro_receive);
3643 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3645 __skb_pull(skb, skb_headlen(skb));
3646 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3647 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3649 skb->dev = napi->dev;
3651 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
3656 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3658 struct sk_buff *skb = napi->skb;
3661 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3667 EXPORT_SYMBOL(napi_get_frags);
3669 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3675 skb->protocol = eth_type_trans(skb, skb->dev);
3677 if (ret == GRO_HELD)
3678 skb_gro_pull(skb, -ETH_HLEN);
3679 else if (netif_receive_skb(skb))
3684 case GRO_MERGED_FREE:
3685 napi_reuse_skb(napi, skb);
3694 EXPORT_SYMBOL(napi_frags_finish);
3696 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3698 struct sk_buff *skb = napi->skb;
3705 skb_reset_mac_header(skb);
3706 skb_gro_reset_offset(skb);
3708 off = skb_gro_offset(skb);
3709 hlen = off + sizeof(*eth);
3710 eth = skb_gro_header_fast(skb, off);
3711 if (skb_gro_header_hard(skb, hlen)) {
3712 eth = skb_gro_header_slow(skb, hlen, off);
3713 if (unlikely(!eth)) {
3714 napi_reuse_skb(napi, skb);
3720 skb_gro_pull(skb, sizeof(*eth));
3723 * This works because the only protocols we care about don't require
3724 * special handling. We'll fix it up properly at the end.
3726 skb->protocol = eth->h_proto;
3731 EXPORT_SYMBOL(napi_frags_skb);
3733 gro_result_t napi_gro_frags(struct napi_struct *napi)
3735 struct sk_buff *skb = napi_frags_skb(napi);
3740 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3742 EXPORT_SYMBOL(napi_gro_frags);
3745 * net_rps_action sends any pending IPI's for rps.
3746 * Note: called with local irq disabled, but exits with local irq enabled.
3748 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3751 struct softnet_data *remsd = sd->rps_ipi_list;
3754 sd->rps_ipi_list = NULL;
3758 /* Send pending IPI's to kick RPS processing on remote cpus. */
3760 struct softnet_data *next = remsd->rps_ipi_next;
3762 if (cpu_online(remsd->cpu))
3763 __smp_call_function_single(remsd->cpu,
3772 static int process_backlog(struct napi_struct *napi, int quota)
3775 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3778 /* Check if we have pending ipi, its better to send them now,
3779 * not waiting net_rx_action() end.
3781 if (sd->rps_ipi_list) {
3782 local_irq_disable();
3783 net_rps_action_and_irq_enable(sd);
3786 napi->weight = weight_p;
3787 local_irq_disable();
3788 while (work < quota) {
3789 struct sk_buff *skb;
3792 while ((skb = __skb_dequeue(&sd->process_queue))) {
3795 __netif_receive_skb(skb);
3797 local_irq_disable();
3798 input_queue_head_incr(sd);
3799 if (++work >= quota) {
3806 qlen = skb_queue_len(&sd->input_pkt_queue);
3808 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3809 &sd->process_queue);
3811 if (qlen < quota - work) {
3813 * Inline a custom version of __napi_complete().
3814 * only current cpu owns and manipulates this napi,
3815 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3816 * we can use a plain write instead of clear_bit(),
3817 * and we dont need an smp_mb() memory barrier.
3819 list_del(&napi->poll_list);
3822 quota = work + qlen;
3832 * __napi_schedule - schedule for receive
3833 * @n: entry to schedule
3835 * The entry's receive function will be scheduled to run
3837 void __napi_schedule(struct napi_struct *n)
3839 unsigned long flags;
3841 local_irq_save(flags);
3842 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3843 local_irq_restore(flags);
3845 EXPORT_SYMBOL(__napi_schedule);
3847 void __napi_complete(struct napi_struct *n)
3849 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3850 BUG_ON(n->gro_list);
3852 list_del(&n->poll_list);
3853 smp_mb__before_clear_bit();
3854 clear_bit(NAPI_STATE_SCHED, &n->state);
3856 EXPORT_SYMBOL(__napi_complete);
3858 void napi_complete(struct napi_struct *n)
3860 unsigned long flags;
3863 * don't let napi dequeue from the cpu poll list
3864 * just in case its running on a different cpu
3866 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3870 local_irq_save(flags);
3872 local_irq_restore(flags);
3874 EXPORT_SYMBOL(napi_complete);
3876 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3877 int (*poll)(struct napi_struct *, int), int weight)
3879 INIT_LIST_HEAD(&napi->poll_list);
3880 napi->gro_count = 0;
3881 napi->gro_list = NULL;
3884 napi->weight = weight;
3885 list_add(&napi->dev_list, &dev->napi_list);
3887 #ifdef CONFIG_NETPOLL
3888 spin_lock_init(&napi->poll_lock);
3889 napi->poll_owner = -1;
3891 set_bit(NAPI_STATE_SCHED, &napi->state);
3893 EXPORT_SYMBOL(netif_napi_add);
3895 void netif_napi_del(struct napi_struct *napi)
3897 struct sk_buff *skb, *next;
3899 list_del_init(&napi->dev_list);
3900 napi_free_frags(napi);
3902 for (skb = napi->gro_list; skb; skb = next) {
3908 napi->gro_list = NULL;
3909 napi->gro_count = 0;
3911 EXPORT_SYMBOL(netif_napi_del);
3913 static void net_rx_action(struct softirq_action *h)
3915 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3916 unsigned long time_limit = jiffies + 2;
3917 int budget = netdev_budget;
3920 local_irq_disable();
3922 while (!list_empty(&sd->poll_list)) {
3923 struct napi_struct *n;
3926 /* If softirq window is exhuasted then punt.
3927 * Allow this to run for 2 jiffies since which will allow
3928 * an average latency of 1.5/HZ.
3930 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3935 /* Even though interrupts have been re-enabled, this
3936 * access is safe because interrupts can only add new
3937 * entries to the tail of this list, and only ->poll()
3938 * calls can remove this head entry from the list.
3940 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3942 have = netpoll_poll_lock(n);
3946 /* This NAPI_STATE_SCHED test is for avoiding a race
3947 * with netpoll's poll_napi(). Only the entity which
3948 * obtains the lock and sees NAPI_STATE_SCHED set will
3949 * actually make the ->poll() call. Therefore we avoid
3950 * accidentally calling ->poll() when NAPI is not scheduled.
3953 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3954 work = n->poll(n, weight);
3958 WARN_ON_ONCE(work > weight);
3962 local_irq_disable();
3964 /* Drivers must not modify the NAPI state if they
3965 * consume the entire weight. In such cases this code
3966 * still "owns" the NAPI instance and therefore can
3967 * move the instance around on the list at-will.
3969 if (unlikely(work == weight)) {
3970 if (unlikely(napi_disable_pending(n))) {
3973 local_irq_disable();
3975 list_move_tail(&n->poll_list, &sd->poll_list);
3978 netpoll_poll_unlock(have);
3981 net_rps_action_and_irq_enable(sd);
3983 #ifdef CONFIG_NET_DMA
3985 * There may not be any more sk_buffs coming right now, so push
3986 * any pending DMA copies to hardware
3988 dma_issue_pending_all();
3995 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3999 static gifconf_func_t *gifconf_list[NPROTO];
4002 * register_gifconf - register a SIOCGIF handler
4003 * @family: Address family
4004 * @gifconf: Function handler
4006 * Register protocol dependent address dumping routines. The handler
4007 * that is passed must not be freed or reused until it has been replaced
4008 * by another handler.
4010 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
4012 if (family >= NPROTO)
4014 gifconf_list[family] = gifconf;
4017 EXPORT_SYMBOL(register_gifconf);
4021 * Map an interface index to its name (SIOCGIFNAME)
4025 * We need this ioctl for efficient implementation of the
4026 * if_indextoname() function required by the IPv6 API. Without
4027 * it, we would have to search all the interfaces to find a
4031 static int dev_ifname(struct net *net, struct ifreq __user *arg)
4033 struct net_device *dev;
4037 * Fetch the caller's info block.
4040 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4044 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4050 strcpy(ifr.ifr_name, dev->name);
4053 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4059 * Perform a SIOCGIFCONF call. This structure will change
4060 * size eventually, and there is nothing I can do about it.
4061 * Thus we will need a 'compatibility mode'.
4064 static int dev_ifconf(struct net *net, char __user *arg)
4067 struct net_device *dev;
4074 * Fetch the caller's info block.
4077 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4084 * Loop over the interfaces, and write an info block for each.
4088 for_each_netdev(net, dev) {
4089 for (i = 0; i < NPROTO; i++) {
4090 if (gifconf_list[i]) {
4093 done = gifconf_list[i](dev, NULL, 0);
4095 done = gifconf_list[i](dev, pos + total,
4105 * All done. Write the updated control block back to the caller.
4107 ifc.ifc_len = total;
4110 * Both BSD and Solaris return 0 here, so we do too.
4112 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4115 #ifdef CONFIG_PROC_FS
4117 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4119 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4120 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4121 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4123 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4125 struct net *net = seq_file_net(seq);
4126 struct net_device *dev;
4127 struct hlist_node *p;
4128 struct hlist_head *h;
4129 unsigned int count = 0, offset = get_offset(*pos);
4131 h = &net->dev_name_head[get_bucket(*pos)];
4132 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4133 if (++count == offset)
4140 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4142 struct net_device *dev;
4143 unsigned int bucket;
4146 dev = dev_from_same_bucket(seq, pos);
4150 bucket = get_bucket(*pos) + 1;
4151 *pos = set_bucket_offset(bucket, 1);
4152 } while (bucket < NETDEV_HASHENTRIES);
4158 * This is invoked by the /proc filesystem handler to display a device
4161 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4166 return SEQ_START_TOKEN;
4168 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4171 return dev_from_bucket(seq, pos);
4174 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4177 return dev_from_bucket(seq, pos);
4180 void dev_seq_stop(struct seq_file *seq, void *v)
4186 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4188 struct rtnl_link_stats64 temp;
4189 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4191 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4192 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4193 dev->name, stats->rx_bytes, stats->rx_packets,
4195 stats->rx_dropped + stats->rx_missed_errors,
4196 stats->rx_fifo_errors,
4197 stats->rx_length_errors + stats->rx_over_errors +
4198 stats->rx_crc_errors + stats->rx_frame_errors,
4199 stats->rx_compressed, stats->multicast,
4200 stats->tx_bytes, stats->tx_packets,
4201 stats->tx_errors, stats->tx_dropped,
4202 stats->tx_fifo_errors, stats->collisions,
4203 stats->tx_carrier_errors +
4204 stats->tx_aborted_errors +
4205 stats->tx_window_errors +
4206 stats->tx_heartbeat_errors,
4207 stats->tx_compressed);
4211 * Called from the PROCfs module. This now uses the new arbitrary sized
4212 * /proc/net interface to create /proc/net/dev
4214 static int dev_seq_show(struct seq_file *seq, void *v)
4216 if (v == SEQ_START_TOKEN)
4217 seq_puts(seq, "Inter-| Receive "
4219 " face |bytes packets errs drop fifo frame "
4220 "compressed multicast|bytes packets errs "
4221 "drop fifo colls carrier compressed\n");
4223 dev_seq_printf_stats(seq, v);
4227 static struct softnet_data *softnet_get_online(loff_t *pos)
4229 struct softnet_data *sd = NULL;
4231 while (*pos < nr_cpu_ids)
4232 if (cpu_online(*pos)) {
4233 sd = &per_cpu(softnet_data, *pos);
4240 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4242 return softnet_get_online(pos);
4245 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4248 return softnet_get_online(pos);
4251 static void softnet_seq_stop(struct seq_file *seq, void *v)
4255 static int softnet_seq_show(struct seq_file *seq, void *v)
4257 struct softnet_data *sd = v;
4259 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4260 sd->processed, sd->dropped, sd->time_squeeze, 0,
4261 0, 0, 0, 0, /* was fastroute */
4262 sd->cpu_collision, sd->received_rps);
4266 static const struct seq_operations dev_seq_ops = {
4267 .start = dev_seq_start,
4268 .next = dev_seq_next,
4269 .stop = dev_seq_stop,
4270 .show = dev_seq_show,
4273 static int dev_seq_open(struct inode *inode, struct file *file)
4275 return seq_open_net(inode, file, &dev_seq_ops,
4276 sizeof(struct seq_net_private));
4279 static const struct file_operations dev_seq_fops = {
4280 .owner = THIS_MODULE,
4281 .open = dev_seq_open,
4283 .llseek = seq_lseek,
4284 .release = seq_release_net,
4287 static const struct seq_operations softnet_seq_ops = {
4288 .start = softnet_seq_start,
4289 .next = softnet_seq_next,
4290 .stop = softnet_seq_stop,
4291 .show = softnet_seq_show,
4294 static int softnet_seq_open(struct inode *inode, struct file *file)
4296 return seq_open(file, &softnet_seq_ops);
4299 static const struct file_operations softnet_seq_fops = {
4300 .owner = THIS_MODULE,
4301 .open = softnet_seq_open,
4303 .llseek = seq_lseek,
4304 .release = seq_release,
4307 static void *ptype_get_idx(loff_t pos)
4309 struct packet_type *pt = NULL;
4313 list_for_each_entry_rcu(pt, &ptype_all, list) {
4319 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4320 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4329 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4333 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4336 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4338 struct packet_type *pt;
4339 struct list_head *nxt;
4343 if (v == SEQ_START_TOKEN)
4344 return ptype_get_idx(0);
4347 nxt = pt->list.next;
4348 if (pt->type == htons(ETH_P_ALL)) {
4349 if (nxt != &ptype_all)
4352 nxt = ptype_base[0].next;
4354 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4356 while (nxt == &ptype_base[hash]) {
4357 if (++hash >= PTYPE_HASH_SIZE)
4359 nxt = ptype_base[hash].next;
4362 return list_entry(nxt, struct packet_type, list);
4365 static void ptype_seq_stop(struct seq_file *seq, void *v)
4371 static int ptype_seq_show(struct seq_file *seq, void *v)
4373 struct packet_type *pt = v;
4375 if (v == SEQ_START_TOKEN)
4376 seq_puts(seq, "Type Device Function\n");
4377 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4378 if (pt->type == htons(ETH_P_ALL))
4379 seq_puts(seq, "ALL ");
4381 seq_printf(seq, "%04x", ntohs(pt->type));
4383 seq_printf(seq, " %-8s %pF\n",
4384 pt->dev ? pt->dev->name : "", pt->func);
4390 static const struct seq_operations ptype_seq_ops = {
4391 .start = ptype_seq_start,
4392 .next = ptype_seq_next,
4393 .stop = ptype_seq_stop,
4394 .show = ptype_seq_show,
4397 static int ptype_seq_open(struct inode *inode, struct file *file)
4399 return seq_open_net(inode, file, &ptype_seq_ops,
4400 sizeof(struct seq_net_private));
4403 static const struct file_operations ptype_seq_fops = {
4404 .owner = THIS_MODULE,
4405 .open = ptype_seq_open,
4407 .llseek = seq_lseek,
4408 .release = seq_release_net,
4412 static int __net_init dev_proc_net_init(struct net *net)
4416 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4418 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4420 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4423 if (wext_proc_init(net))
4429 proc_net_remove(net, "ptype");
4431 proc_net_remove(net, "softnet_stat");
4433 proc_net_remove(net, "dev");
4437 static void __net_exit dev_proc_net_exit(struct net *net)
4439 wext_proc_exit(net);
4441 proc_net_remove(net, "ptype");
4442 proc_net_remove(net, "softnet_stat");
4443 proc_net_remove(net, "dev");
4446 static struct pernet_operations __net_initdata dev_proc_ops = {
4447 .init = dev_proc_net_init,
4448 .exit = dev_proc_net_exit,
4451 static int __init dev_proc_init(void)
4453 return register_pernet_subsys(&dev_proc_ops);
4456 #define dev_proc_init() 0
4457 #endif /* CONFIG_PROC_FS */
4461 * netdev_set_master - set up master pointer
4462 * @slave: slave device
4463 * @master: new master device
4465 * Changes the master device of the slave. Pass %NULL to break the
4466 * bonding. The caller must hold the RTNL semaphore. On a failure
4467 * a negative errno code is returned. On success the reference counts
4468 * are adjusted and the function returns zero.
4470 int netdev_set_master(struct net_device *slave, struct net_device *master)
4472 struct net_device *old = slave->master;
4482 slave->master = master;
4488 EXPORT_SYMBOL(netdev_set_master);
4491 * netdev_set_bond_master - set up bonding master/slave pair
4492 * @slave: slave device
4493 * @master: new master device
4495 * Changes the master device of the slave. Pass %NULL to break the
4496 * bonding. The caller must hold the RTNL semaphore. On a failure
4497 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4498 * to the routing socket and the function returns zero.
4500 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4506 err = netdev_set_master(slave, master);
4510 slave->flags |= IFF_SLAVE;
4512 slave->flags &= ~IFF_SLAVE;
4514 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4517 EXPORT_SYMBOL(netdev_set_bond_master);
4519 static void dev_change_rx_flags(struct net_device *dev, int flags)
4521 const struct net_device_ops *ops = dev->netdev_ops;
4523 if (ops->ndo_change_rx_flags)
4524 ops->ndo_change_rx_flags(dev, flags);
4527 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4529 unsigned short old_flags = dev->flags;
4535 dev->flags |= IFF_PROMISC;
4536 dev->promiscuity += inc;
4537 if (dev->promiscuity == 0) {
4540 * If inc causes overflow, untouch promisc and return error.
4543 dev->flags &= ~IFF_PROMISC;
4545 dev->promiscuity -= inc;
4546 printk(KERN_WARNING "%s: promiscuity touches roof, "
4547 "set promiscuity failed, promiscuity feature "
4548 "of device might be broken.\n", dev->name);
4552 if (dev->flags != old_flags) {
4553 printk(KERN_INFO "device %s %s promiscuous mode\n",
4554 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4556 if (audit_enabled) {
4557 current_uid_gid(&uid, &gid);
4558 audit_log(current->audit_context, GFP_ATOMIC,
4559 AUDIT_ANOM_PROMISCUOUS,
4560 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4561 dev->name, (dev->flags & IFF_PROMISC),
4562 (old_flags & IFF_PROMISC),
4563 audit_get_loginuid(current),
4565 audit_get_sessionid(current));
4568 dev_change_rx_flags(dev, IFF_PROMISC);
4574 * dev_set_promiscuity - update promiscuity count on a device
4578 * Add or remove promiscuity from a device. While the count in the device
4579 * remains above zero the interface remains promiscuous. Once it hits zero
4580 * the device reverts back to normal filtering operation. A negative inc
4581 * value is used to drop promiscuity on the device.
4582 * Return 0 if successful or a negative errno code on error.
4584 int dev_set_promiscuity(struct net_device *dev, int inc)
4586 unsigned short old_flags = dev->flags;
4589 err = __dev_set_promiscuity(dev, inc);
4592 if (dev->flags != old_flags)
4593 dev_set_rx_mode(dev);
4596 EXPORT_SYMBOL(dev_set_promiscuity);
4599 * dev_set_allmulti - update allmulti count on a device
4603 * Add or remove reception of all multicast frames to a device. While the
4604 * count in the device remains above zero the interface remains listening
4605 * to all interfaces. Once it hits zero the device reverts back to normal
4606 * filtering operation. A negative @inc value is used to drop the counter
4607 * when releasing a resource needing all multicasts.
4608 * Return 0 if successful or a negative errno code on error.
4611 int dev_set_allmulti(struct net_device *dev, int inc)
4613 unsigned short old_flags = dev->flags;
4617 dev->flags |= IFF_ALLMULTI;
4618 dev->allmulti += inc;
4619 if (dev->allmulti == 0) {
4622 * If inc causes overflow, untouch allmulti and return error.
4625 dev->flags &= ~IFF_ALLMULTI;
4627 dev->allmulti -= inc;
4628 printk(KERN_WARNING "%s: allmulti touches roof, "
4629 "set allmulti failed, allmulti feature of "
4630 "device might be broken.\n", dev->name);
4634 if (dev->flags ^ old_flags) {
4635 dev_change_rx_flags(dev, IFF_ALLMULTI);
4636 dev_set_rx_mode(dev);
4640 EXPORT_SYMBOL(dev_set_allmulti);
4643 * Upload unicast and multicast address lists to device and
4644 * configure RX filtering. When the device doesn't support unicast
4645 * filtering it is put in promiscuous mode while unicast addresses
4648 void __dev_set_rx_mode(struct net_device *dev)
4650 const struct net_device_ops *ops = dev->netdev_ops;
4652 /* dev_open will call this function so the list will stay sane. */
4653 if (!(dev->flags&IFF_UP))
4656 if (!netif_device_present(dev))
4659 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4660 /* Unicast addresses changes may only happen under the rtnl,
4661 * therefore calling __dev_set_promiscuity here is safe.
4663 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4664 __dev_set_promiscuity(dev, 1);
4665 dev->uc_promisc = true;
4666 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4667 __dev_set_promiscuity(dev, -1);
4668 dev->uc_promisc = false;
4672 if (ops->ndo_set_rx_mode)
4673 ops->ndo_set_rx_mode(dev);
4676 void dev_set_rx_mode(struct net_device *dev)
4678 netif_addr_lock_bh(dev);
4679 __dev_set_rx_mode(dev);
4680 netif_addr_unlock_bh(dev);
4684 * dev_get_flags - get flags reported to userspace
4687 * Get the combination of flag bits exported through APIs to userspace.
4689 unsigned dev_get_flags(const struct net_device *dev)
4693 flags = (dev->flags & ~(IFF_PROMISC |
4698 (dev->gflags & (IFF_PROMISC |
4701 if (netif_running(dev)) {
4702 if (netif_oper_up(dev))
4703 flags |= IFF_RUNNING;
4704 if (netif_carrier_ok(dev))
4705 flags |= IFF_LOWER_UP;
4706 if (netif_dormant(dev))
4707 flags |= IFF_DORMANT;
4712 EXPORT_SYMBOL(dev_get_flags);
4714 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4716 int old_flags = dev->flags;
4722 * Set the flags on our device.
4725 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4726 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4728 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4732 * Load in the correct multicast list now the flags have changed.
4735 if ((old_flags ^ flags) & IFF_MULTICAST)
4736 dev_change_rx_flags(dev, IFF_MULTICAST);
4738 dev_set_rx_mode(dev);
4741 * Have we downed the interface. We handle IFF_UP ourselves
4742 * according to user attempts to set it, rather than blindly
4747 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4748 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4751 dev_set_rx_mode(dev);
4754 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4755 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4757 dev->gflags ^= IFF_PROMISC;
4758 dev_set_promiscuity(dev, inc);
4761 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4762 is important. Some (broken) drivers set IFF_PROMISC, when
4763 IFF_ALLMULTI is requested not asking us and not reporting.
4765 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4766 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4768 dev->gflags ^= IFF_ALLMULTI;
4769 dev_set_allmulti(dev, inc);
4775 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4777 unsigned int changes = dev->flags ^ old_flags;
4779 if (changes & IFF_UP) {
4780 if (dev->flags & IFF_UP)
4781 call_netdevice_notifiers(NETDEV_UP, dev);
4783 call_netdevice_notifiers(NETDEV_DOWN, dev);
4786 if (dev->flags & IFF_UP &&
4787 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4788 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4792 * dev_change_flags - change device settings
4794 * @flags: device state flags
4796 * Change settings on device based state flags. The flags are
4797 * in the userspace exported format.
4799 int dev_change_flags(struct net_device *dev, unsigned flags)
4802 int old_flags = dev->flags;
4804 ret = __dev_change_flags(dev, flags);
4808 changes = old_flags ^ dev->flags;
4810 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4812 __dev_notify_flags(dev, old_flags);
4815 EXPORT_SYMBOL(dev_change_flags);
4818 * dev_set_mtu - Change maximum transfer unit
4820 * @new_mtu: new transfer unit
4822 * Change the maximum transfer size of the network device.
4824 int dev_set_mtu(struct net_device *dev, int new_mtu)
4826 const struct net_device_ops *ops = dev->netdev_ops;
4829 if (new_mtu == dev->mtu)
4832 /* MTU must be positive. */
4836 if (!netif_device_present(dev))
4840 if (ops->ndo_change_mtu)
4841 err = ops->ndo_change_mtu(dev, new_mtu);
4845 if (!err && dev->flags & IFF_UP)
4846 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4849 EXPORT_SYMBOL(dev_set_mtu);
4852 * dev_set_group - Change group this device belongs to
4854 * @new_group: group this device should belong to
4856 void dev_set_group(struct net_device *dev, int new_group)
4858 dev->group = new_group;
4860 EXPORT_SYMBOL(dev_set_group);
4863 * dev_set_mac_address - Change Media Access Control Address
4867 * Change the hardware (MAC) address of the device
4869 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4871 const struct net_device_ops *ops = dev->netdev_ops;
4874 if (!ops->ndo_set_mac_address)
4876 if (sa->sa_family != dev->type)
4878 if (!netif_device_present(dev))
4880 err = ops->ndo_set_mac_address(dev, sa);
4882 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4883 add_device_randomness(dev->dev_addr, dev->addr_len);
4886 EXPORT_SYMBOL(dev_set_mac_address);
4889 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4891 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4894 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4900 case SIOCGIFFLAGS: /* Get interface flags */
4901 ifr->ifr_flags = (short) dev_get_flags(dev);
4904 case SIOCGIFMETRIC: /* Get the metric on the interface
4905 (currently unused) */
4906 ifr->ifr_metric = 0;
4909 case SIOCGIFMTU: /* Get the MTU of a device */
4910 ifr->ifr_mtu = dev->mtu;
4915 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4917 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4918 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4919 ifr->ifr_hwaddr.sa_family = dev->type;
4927 ifr->ifr_map.mem_start = dev->mem_start;
4928 ifr->ifr_map.mem_end = dev->mem_end;
4929 ifr->ifr_map.base_addr = dev->base_addr;
4930 ifr->ifr_map.irq = dev->irq;
4931 ifr->ifr_map.dma = dev->dma;
4932 ifr->ifr_map.port = dev->if_port;
4936 ifr->ifr_ifindex = dev->ifindex;
4940 ifr->ifr_qlen = dev->tx_queue_len;
4944 /* dev_ioctl() should ensure this case
4956 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4958 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4961 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4962 const struct net_device_ops *ops;
4967 ops = dev->netdev_ops;
4970 case SIOCSIFFLAGS: /* Set interface flags */
4971 return dev_change_flags(dev, ifr->ifr_flags);
4973 case SIOCSIFMETRIC: /* Set the metric on the interface
4974 (currently unused) */
4977 case SIOCSIFMTU: /* Set the MTU of a device */
4978 return dev_set_mtu(dev, ifr->ifr_mtu);
4981 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4983 case SIOCSIFHWBROADCAST:
4984 if (ifr->ifr_hwaddr.sa_family != dev->type)
4986 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4987 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4988 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4992 if (ops->ndo_set_config) {
4993 if (!netif_device_present(dev))
4995 return ops->ndo_set_config(dev, &ifr->ifr_map);
5000 if (!ops->ndo_set_rx_mode ||
5001 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5003 if (!netif_device_present(dev))
5005 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
5008 if (!ops->ndo_set_rx_mode ||
5009 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5011 if (!netif_device_present(dev))
5013 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
5016 if (ifr->ifr_qlen < 0)
5018 dev->tx_queue_len = ifr->ifr_qlen;
5022 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
5023 return dev_change_name(dev, ifr->ifr_newname);
5026 err = net_hwtstamp_validate(ifr);
5032 * Unknown or private ioctl
5035 if ((cmd >= SIOCDEVPRIVATE &&
5036 cmd <= SIOCDEVPRIVATE + 15) ||
5037 cmd == SIOCBONDENSLAVE ||
5038 cmd == SIOCBONDRELEASE ||
5039 cmd == SIOCBONDSETHWADDR ||
5040 cmd == SIOCBONDSLAVEINFOQUERY ||
5041 cmd == SIOCBONDINFOQUERY ||
5042 cmd == SIOCBONDCHANGEACTIVE ||
5043 cmd == SIOCGMIIPHY ||
5044 cmd == SIOCGMIIREG ||
5045 cmd == SIOCSMIIREG ||
5046 cmd == SIOCBRADDIF ||
5047 cmd == SIOCBRDELIF ||
5048 cmd == SIOCSHWTSTAMP ||
5049 cmd == SIOCWANDEV) {
5051 if (ops->ndo_do_ioctl) {
5052 if (netif_device_present(dev))
5053 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5065 * This function handles all "interface"-type I/O control requests. The actual
5066 * 'doing' part of this is dev_ifsioc above.
5070 * dev_ioctl - network device ioctl
5071 * @net: the applicable net namespace
5072 * @cmd: command to issue
5073 * @arg: pointer to a struct ifreq in user space
5075 * Issue ioctl functions to devices. This is normally called by the
5076 * user space syscall interfaces but can sometimes be useful for
5077 * other purposes. The return value is the return from the syscall if
5078 * positive or a negative errno code on error.
5081 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5087 /* One special case: SIOCGIFCONF takes ifconf argument
5088 and requires shared lock, because it sleeps writing
5092 if (cmd == SIOCGIFCONF) {
5094 ret = dev_ifconf(net, (char __user *) arg);
5098 if (cmd == SIOCGIFNAME)
5099 return dev_ifname(net, (struct ifreq __user *)arg);
5101 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5104 ifr.ifr_name[IFNAMSIZ-1] = 0;
5106 colon = strchr(ifr.ifr_name, ':');
5111 * See which interface the caller is talking about.
5116 * These ioctl calls:
5117 * - can be done by all.
5118 * - atomic and do not require locking.
5129 dev_load(net, ifr.ifr_name);
5131 ret = dev_ifsioc_locked(net, &ifr, cmd);
5136 if (copy_to_user(arg, &ifr,
5137 sizeof(struct ifreq)))
5143 dev_load(net, ifr.ifr_name);
5145 ret = dev_ethtool(net, &ifr);
5150 if (copy_to_user(arg, &ifr,
5151 sizeof(struct ifreq)))
5157 * These ioctl calls:
5158 * - require superuser power.
5159 * - require strict serialization.
5165 if (!capable(CAP_NET_ADMIN))
5167 dev_load(net, ifr.ifr_name);
5169 ret = dev_ifsioc(net, &ifr, cmd);
5174 if (copy_to_user(arg, &ifr,
5175 sizeof(struct ifreq)))
5181 * These ioctl calls:
5182 * - require superuser power.
5183 * - require strict serialization.
5184 * - do not return a value
5194 case SIOCSIFHWBROADCAST:
5197 case SIOCBONDENSLAVE:
5198 case SIOCBONDRELEASE:
5199 case SIOCBONDSETHWADDR:
5200 case SIOCBONDCHANGEACTIVE:
5204 if (!capable(CAP_NET_ADMIN))
5207 case SIOCBONDSLAVEINFOQUERY:
5208 case SIOCBONDINFOQUERY:
5209 dev_load(net, ifr.ifr_name);
5211 ret = dev_ifsioc(net, &ifr, cmd);
5216 /* Get the per device memory space. We can add this but
5217 * currently do not support it */
5219 /* Set the per device memory buffer space.
5220 * Not applicable in our case */
5225 * Unknown or private ioctl.
5228 if (cmd == SIOCWANDEV ||
5229 (cmd >= SIOCDEVPRIVATE &&
5230 cmd <= SIOCDEVPRIVATE + 15)) {
5231 dev_load(net, ifr.ifr_name);
5233 ret = dev_ifsioc(net, &ifr, cmd);
5235 if (!ret && copy_to_user(arg, &ifr,
5236 sizeof(struct ifreq)))
5240 /* Take care of Wireless Extensions */
5241 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5242 return wext_handle_ioctl(net, &ifr, cmd, arg);
5249 * dev_new_index - allocate an ifindex
5250 * @net: the applicable net namespace
5252 * Returns a suitable unique value for a new device interface
5253 * number. The caller must hold the rtnl semaphore or the
5254 * dev_base_lock to be sure it remains unique.
5256 static int dev_new_index(struct net *net)
5262 if (!__dev_get_by_index(net, ifindex))
5267 /* Delayed registration/unregisteration */
5268 static LIST_HEAD(net_todo_list);
5270 static void net_set_todo(struct net_device *dev)
5272 list_add_tail(&dev->todo_list, &net_todo_list);
5275 static void rollback_registered_many(struct list_head *head)
5277 struct net_device *dev, *tmp;
5279 BUG_ON(dev_boot_phase);
5282 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5283 /* Some devices call without registering
5284 * for initialization unwind. Remove those
5285 * devices and proceed with the remaining.
5287 if (dev->reg_state == NETREG_UNINITIALIZED) {
5288 pr_debug("unregister_netdevice: device %s/%p never "
5289 "was registered\n", dev->name, dev);
5292 list_del(&dev->unreg_list);
5295 dev->dismantle = true;
5296 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5299 /* If device is running, close it first. */
5300 dev_close_many(head);
5302 list_for_each_entry(dev, head, unreg_list) {
5303 /* And unlink it from device chain. */
5304 unlist_netdevice(dev);
5306 dev->reg_state = NETREG_UNREGISTERING;
5307 on_each_cpu(flush_backlog, dev, 1);
5312 list_for_each_entry(dev, head, unreg_list) {
5313 /* Shutdown queueing discipline. */
5317 /* Notify protocols, that we are about to destroy
5318 this device. They should clean all the things.
5320 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5322 if (!dev->rtnl_link_ops ||
5323 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5324 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5327 * Flush the unicast and multicast chains
5332 if (dev->netdev_ops->ndo_uninit)
5333 dev->netdev_ops->ndo_uninit(dev);
5335 /* Notifier chain MUST detach us from master device. */
5336 WARN_ON(dev->master);
5338 /* Remove entries from kobject tree */
5339 netdev_unregister_kobject(dev);
5342 /* Process any work delayed until the end of the batch */
5343 dev = list_first_entry(head, struct net_device, unreg_list);
5344 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5348 list_for_each_entry(dev, head, unreg_list)
5352 static void rollback_registered(struct net_device *dev)
5356 list_add(&dev->unreg_list, &single);
5357 rollback_registered_many(&single);
5361 static u32 netdev_fix_features(struct net_device *dev, u32 features)
5363 /* Fix illegal checksum combinations */
5364 if ((features & NETIF_F_HW_CSUM) &&
5365 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5366 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5367 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5370 if ((features & NETIF_F_NO_CSUM) &&
5371 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5372 netdev_warn(dev, "mixed no checksumming and other settings.\n");
5373 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5376 /* Fix illegal SG+CSUM combinations. */
5377 if ((features & NETIF_F_SG) &&
5378 !(features & NETIF_F_ALL_CSUM)) {
5380 "Dropping NETIF_F_SG since no checksum feature.\n");
5381 features &= ~NETIF_F_SG;
5384 /* TSO requires that SG is present as well. */
5385 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5386 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5387 features &= ~NETIF_F_ALL_TSO;
5390 /* TSO ECN requires that TSO is present as well. */
5391 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5392 features &= ~NETIF_F_TSO_ECN;
5394 /* Software GSO depends on SG. */
5395 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5396 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5397 features &= ~NETIF_F_GSO;
5400 /* UFO needs SG and checksumming */
5401 if (features & NETIF_F_UFO) {
5402 /* maybe split UFO into V4 and V6? */
5403 if (!((features & NETIF_F_GEN_CSUM) ||
5404 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5405 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5407 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5408 features &= ~NETIF_F_UFO;
5411 if (!(features & NETIF_F_SG)) {
5413 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5414 features &= ~NETIF_F_UFO;
5421 int __netdev_update_features(struct net_device *dev)
5428 features = netdev_get_wanted_features(dev);
5430 if (dev->netdev_ops->ndo_fix_features)
5431 features = dev->netdev_ops->ndo_fix_features(dev, features);
5433 /* driver might be less strict about feature dependencies */
5434 features = netdev_fix_features(dev, features);
5436 if (dev->features == features)
5439 netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n",
5440 dev->features, features);
5442 if (dev->netdev_ops->ndo_set_features)
5443 err = dev->netdev_ops->ndo_set_features(dev, features);
5445 if (unlikely(err < 0)) {
5447 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5448 err, features, dev->features);
5453 dev->features = features;
5459 * netdev_update_features - recalculate device features
5460 * @dev: the device to check
5462 * Recalculate dev->features set and send notifications if it
5463 * has changed. Should be called after driver or hardware dependent
5464 * conditions might have changed that influence the features.
5466 void netdev_update_features(struct net_device *dev)
5468 if (__netdev_update_features(dev))
5469 netdev_features_change(dev);
5471 EXPORT_SYMBOL(netdev_update_features);
5474 * netdev_change_features - recalculate device features
5475 * @dev: the device to check
5477 * Recalculate dev->features set and send notifications even
5478 * if they have not changed. Should be called instead of
5479 * netdev_update_features() if also dev->vlan_features might
5480 * have changed to allow the changes to be propagated to stacked
5483 void netdev_change_features(struct net_device *dev)
5485 __netdev_update_features(dev);
5486 netdev_features_change(dev);
5488 EXPORT_SYMBOL(netdev_change_features);
5491 * netif_stacked_transfer_operstate - transfer operstate
5492 * @rootdev: the root or lower level device to transfer state from
5493 * @dev: the device to transfer operstate to
5495 * Transfer operational state from root to device. This is normally
5496 * called when a stacking relationship exists between the root
5497 * device and the device(a leaf device).
5499 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5500 struct net_device *dev)
5502 if (rootdev->operstate == IF_OPER_DORMANT)
5503 netif_dormant_on(dev);
5505 netif_dormant_off(dev);
5507 if (netif_carrier_ok(rootdev)) {
5508 if (!netif_carrier_ok(dev))
5509 netif_carrier_on(dev);
5511 if (netif_carrier_ok(dev))
5512 netif_carrier_off(dev);
5515 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5518 static int netif_alloc_rx_queues(struct net_device *dev)
5520 unsigned int i, count = dev->num_rx_queues;
5521 struct netdev_rx_queue *rx;
5525 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5527 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5532 for (i = 0; i < count; i++)
5538 static void netdev_init_one_queue(struct net_device *dev,
5539 struct netdev_queue *queue, void *_unused)
5541 /* Initialize queue lock */
5542 spin_lock_init(&queue->_xmit_lock);
5543 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5544 queue->xmit_lock_owner = -1;
5545 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5549 static int netif_alloc_netdev_queues(struct net_device *dev)
5551 unsigned int count = dev->num_tx_queues;
5552 struct netdev_queue *tx;
5556 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5558 pr_err("netdev: Unable to allocate %u tx queues.\n",
5564 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5565 spin_lock_init(&dev->tx_global_lock);
5571 * register_netdevice - register a network device
5572 * @dev: device to register
5574 * Take a completed network device structure and add it to the kernel
5575 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5576 * chain. 0 is returned on success. A negative errno code is returned
5577 * on a failure to set up the device, or if the name is a duplicate.
5579 * Callers must hold the rtnl semaphore. You may want
5580 * register_netdev() instead of this.
5583 * The locking appears insufficient to guarantee two parallel registers
5584 * will not get the same name.
5587 int register_netdevice(struct net_device *dev)
5590 struct net *net = dev_net(dev);
5592 BUG_ON(dev_boot_phase);
5597 /* When net_device's are persistent, this will be fatal. */
5598 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5601 spin_lock_init(&dev->addr_list_lock);
5602 netdev_set_addr_lockdep_class(dev);
5606 ret = dev_get_valid_name(dev, dev->name);
5610 /* Init, if this function is available */
5611 if (dev->netdev_ops->ndo_init) {
5612 ret = dev->netdev_ops->ndo_init(dev);
5620 dev->ifindex = dev_new_index(net);
5621 if (dev->iflink == -1)
5622 dev->iflink = dev->ifindex;
5624 /* Transfer changeable features to wanted_features and enable
5625 * software offloads (GSO and GRO).
5627 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5628 dev->features |= NETIF_F_SOFT_FEATURES;
5629 dev->wanted_features = dev->features & dev->hw_features;
5631 /* Turn on no cache copy if HW is doing checksum */
5632 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5633 if ((dev->features & NETIF_F_ALL_CSUM) &&
5634 !(dev->features & NETIF_F_NO_CSUM)) {
5635 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5636 dev->features |= NETIF_F_NOCACHE_COPY;
5639 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5641 dev->vlan_features |= NETIF_F_HIGHDMA;
5643 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5644 ret = notifier_to_errno(ret);
5648 ret = netdev_register_kobject(dev);
5651 dev->reg_state = NETREG_REGISTERED;
5653 __netdev_update_features(dev);
5656 * Default initial state at registry is that the
5657 * device is present.
5660 set_bit(__LINK_STATE_PRESENT, &dev->state);
5662 dev_init_scheduler(dev);
5664 list_netdevice(dev);
5665 add_device_randomness(dev->dev_addr, dev->addr_len);
5667 /* Notify protocols, that a new device appeared. */
5668 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5669 ret = notifier_to_errno(ret);
5671 rollback_registered(dev);
5672 dev->reg_state = NETREG_UNREGISTERED;
5675 * Prevent userspace races by waiting until the network
5676 * device is fully setup before sending notifications.
5678 if (!dev->rtnl_link_ops ||
5679 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5680 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5686 if (dev->netdev_ops->ndo_uninit)
5687 dev->netdev_ops->ndo_uninit(dev);
5690 EXPORT_SYMBOL(register_netdevice);
5693 * init_dummy_netdev - init a dummy network device for NAPI
5694 * @dev: device to init
5696 * This takes a network device structure and initialize the minimum
5697 * amount of fields so it can be used to schedule NAPI polls without
5698 * registering a full blown interface. This is to be used by drivers
5699 * that need to tie several hardware interfaces to a single NAPI
5700 * poll scheduler due to HW limitations.
5702 int init_dummy_netdev(struct net_device *dev)
5704 /* Clear everything. Note we don't initialize spinlocks
5705 * are they aren't supposed to be taken by any of the
5706 * NAPI code and this dummy netdev is supposed to be
5707 * only ever used for NAPI polls
5709 memset(dev, 0, sizeof(struct net_device));
5711 /* make sure we BUG if trying to hit standard
5712 * register/unregister code path
5714 dev->reg_state = NETREG_DUMMY;
5716 /* NAPI wants this */
5717 INIT_LIST_HEAD(&dev->napi_list);
5719 /* a dummy interface is started by default */
5720 set_bit(__LINK_STATE_PRESENT, &dev->state);
5721 set_bit(__LINK_STATE_START, &dev->state);
5723 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5724 * because users of this 'device' dont need to change
5730 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5734 * register_netdev - register a network device
5735 * @dev: device to register
5737 * Take a completed network device structure and add it to the kernel
5738 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5739 * chain. 0 is returned on success. A negative errno code is returned
5740 * on a failure to set up the device, or if the name is a duplicate.
5742 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5743 * and expands the device name if you passed a format string to
5746 int register_netdev(struct net_device *dev)
5751 err = register_netdevice(dev);
5755 EXPORT_SYMBOL(register_netdev);
5757 int netdev_refcnt_read(const struct net_device *dev)
5761 for_each_possible_cpu(i)
5762 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5765 EXPORT_SYMBOL(netdev_refcnt_read);
5768 * netdev_wait_allrefs - wait until all references are gone.
5770 * This is called when unregistering network devices.
5772 * Any protocol or device that holds a reference should register
5773 * for netdevice notification, and cleanup and put back the
5774 * reference if they receive an UNREGISTER event.
5775 * We can get stuck here if buggy protocols don't correctly
5778 static void netdev_wait_allrefs(struct net_device *dev)
5780 unsigned long rebroadcast_time, warning_time;
5783 linkwatch_forget_dev(dev);
5785 rebroadcast_time = warning_time = jiffies;
5786 refcnt = netdev_refcnt_read(dev);
5788 while (refcnt != 0) {
5789 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5792 /* Rebroadcast unregister notification */
5793 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5794 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5795 * should have already handle it the first time */
5797 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5799 /* We must not have linkwatch events
5800 * pending on unregister. If this
5801 * happens, we simply run the queue
5802 * unscheduled, resulting in a noop
5805 linkwatch_run_queue();
5810 rebroadcast_time = jiffies;
5815 refcnt = netdev_refcnt_read(dev);
5817 if (time_after(jiffies, warning_time + 10 * HZ)) {
5818 printk(KERN_EMERG "unregister_netdevice: "
5819 "waiting for %s to become free. Usage "
5822 warning_time = jiffies;
5831 * register_netdevice(x1);
5832 * register_netdevice(x2);
5834 * unregister_netdevice(y1);
5835 * unregister_netdevice(y2);
5841 * We are invoked by rtnl_unlock().
5842 * This allows us to deal with problems:
5843 * 1) We can delete sysfs objects which invoke hotplug
5844 * without deadlocking with linkwatch via keventd.
5845 * 2) Since we run with the RTNL semaphore not held, we can sleep
5846 * safely in order to wait for the netdev refcnt to drop to zero.
5848 * We must not return until all unregister events added during
5849 * the interval the lock was held have been completed.
5851 void netdev_run_todo(void)
5853 struct list_head list;
5855 /* Snapshot list, allow later requests */
5856 list_replace_init(&net_todo_list, &list);
5860 /* Wait for rcu callbacks to finish before attempting to drain
5861 * the device list. This usually avoids a 250ms wait.
5863 if (!list_empty(&list))
5866 while (!list_empty(&list)) {
5867 struct net_device *dev
5868 = list_first_entry(&list, struct net_device, todo_list);
5869 list_del(&dev->todo_list);
5871 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5872 printk(KERN_ERR "network todo '%s' but state %d\n",
5873 dev->name, dev->reg_state);
5878 dev->reg_state = NETREG_UNREGISTERED;
5880 netdev_wait_allrefs(dev);
5883 BUG_ON(netdev_refcnt_read(dev));
5884 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5885 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5886 WARN_ON(dev->dn_ptr);
5888 if (dev->destructor)
5889 dev->destructor(dev);
5891 /* Free network device */
5892 kobject_put(&dev->dev.kobj);
5896 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5897 * fields in the same order, with only the type differing.
5899 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5900 const struct net_device_stats *netdev_stats)
5902 #if BITS_PER_LONG == 64
5903 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5904 memcpy(stats64, netdev_stats, sizeof(*stats64));
5906 size_t i, n = sizeof(*stats64) / sizeof(u64);
5907 const unsigned long *src = (const unsigned long *)netdev_stats;
5908 u64 *dst = (u64 *)stats64;
5910 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5911 sizeof(*stats64) / sizeof(u64));
5912 for (i = 0; i < n; i++)
5918 * dev_get_stats - get network device statistics
5919 * @dev: device to get statistics from
5920 * @storage: place to store stats
5922 * Get network statistics from device. Return @storage.
5923 * The device driver may provide its own method by setting
5924 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5925 * otherwise the internal statistics structure is used.
5927 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5928 struct rtnl_link_stats64 *storage)
5930 const struct net_device_ops *ops = dev->netdev_ops;
5932 if (ops->ndo_get_stats64) {
5933 memset(storage, 0, sizeof(*storage));
5934 ops->ndo_get_stats64(dev, storage);
5935 } else if (ops->ndo_get_stats) {
5936 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5938 netdev_stats_to_stats64(storage, &dev->stats);
5940 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5943 EXPORT_SYMBOL(dev_get_stats);
5945 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5947 struct netdev_queue *queue = dev_ingress_queue(dev);
5949 #ifdef CONFIG_NET_CLS_ACT
5952 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5955 netdev_init_one_queue(dev, queue, NULL);
5956 queue->qdisc = &noop_qdisc;
5957 queue->qdisc_sleeping = &noop_qdisc;
5958 rcu_assign_pointer(dev->ingress_queue, queue);
5964 * alloc_netdev_mqs - allocate network device
5965 * @sizeof_priv: size of private data to allocate space for
5966 * @name: device name format string
5967 * @setup: callback to initialize device
5968 * @txqs: the number of TX subqueues to allocate
5969 * @rxqs: the number of RX subqueues to allocate
5971 * Allocates a struct net_device with private data area for driver use
5972 * and performs basic initialization. Also allocates subquue structs
5973 * for each queue on the device.
5975 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5976 void (*setup)(struct net_device *),
5977 unsigned int txqs, unsigned int rxqs)
5979 struct net_device *dev;
5981 struct net_device *p;
5983 BUG_ON(strlen(name) >= sizeof(dev->name));
5986 pr_err("alloc_netdev: Unable to allocate device "
5987 "with zero queues.\n");
5993 pr_err("alloc_netdev: Unable to allocate device "
5994 "with zero RX queues.\n");
5999 alloc_size = sizeof(struct net_device);
6001 /* ensure 32-byte alignment of private area */
6002 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
6003 alloc_size += sizeof_priv;
6005 /* ensure 32-byte alignment of whole construct */
6006 alloc_size += NETDEV_ALIGN - 1;
6008 p = kzalloc(alloc_size, GFP_KERNEL);
6010 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
6014 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6015 dev->padded = (char *)dev - (char *)p;
6017 dev->pcpu_refcnt = alloc_percpu(int);
6018 if (!dev->pcpu_refcnt)
6021 if (dev_addr_init(dev))
6027 dev_net_set(dev, &init_net);
6029 dev->gso_max_size = GSO_MAX_SIZE;
6030 dev->gso_max_segs = GSO_MAX_SEGS;
6032 INIT_LIST_HEAD(&dev->napi_list);
6033 INIT_LIST_HEAD(&dev->unreg_list);
6034 INIT_LIST_HEAD(&dev->link_watch_list);
6035 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6038 dev->num_tx_queues = txqs;
6039 dev->real_num_tx_queues = txqs;
6040 if (netif_alloc_netdev_queues(dev))
6044 dev->num_rx_queues = rxqs;
6045 dev->real_num_rx_queues = rxqs;
6046 if (netif_alloc_rx_queues(dev))
6050 strcpy(dev->name, name);
6051 dev->group = INIT_NETDEV_GROUP;
6059 free_percpu(dev->pcpu_refcnt);
6069 EXPORT_SYMBOL(alloc_netdev_mqs);
6072 * free_netdev - free network device
6075 * This function does the last stage of destroying an allocated device
6076 * interface. The reference to the device object is released.
6077 * If this is the last reference then it will be freed.
6079 void free_netdev(struct net_device *dev)
6081 struct napi_struct *p, *n;
6083 release_net(dev_net(dev));
6090 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6092 /* Flush device addresses */
6093 dev_addr_flush(dev);
6095 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6098 free_percpu(dev->pcpu_refcnt);
6099 dev->pcpu_refcnt = NULL;
6101 /* Compatibility with error handling in drivers */
6102 if (dev->reg_state == NETREG_UNINITIALIZED) {
6103 kfree((char *)dev - dev->padded);
6107 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6108 dev->reg_state = NETREG_RELEASED;
6110 /* will free via device release */
6111 put_device(&dev->dev);
6113 EXPORT_SYMBOL(free_netdev);
6116 * synchronize_net - Synchronize with packet receive processing
6118 * Wait for packets currently being received to be done.
6119 * Does not block later packets from starting.
6121 void synchronize_net(void)
6124 if (rtnl_is_locked())
6125 synchronize_rcu_expedited();
6129 EXPORT_SYMBOL(synchronize_net);
6132 * unregister_netdevice_queue - remove device from the kernel
6136 * This function shuts down a device interface and removes it
6137 * from the kernel tables.
6138 * If head not NULL, device is queued to be unregistered later.
6140 * Callers must hold the rtnl semaphore. You may want
6141 * unregister_netdev() instead of this.
6144 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6149 list_move_tail(&dev->unreg_list, head);
6151 rollback_registered(dev);
6152 /* Finish processing unregister after unlock */
6156 EXPORT_SYMBOL(unregister_netdevice_queue);
6159 * unregister_netdevice_many - unregister many devices
6160 * @head: list of devices
6162 void unregister_netdevice_many(struct list_head *head)
6164 struct net_device *dev;
6166 if (!list_empty(head)) {
6167 rollback_registered_many(head);
6168 list_for_each_entry(dev, head, unreg_list)
6172 EXPORT_SYMBOL(unregister_netdevice_many);
6175 * unregister_netdev - remove device from the kernel
6178 * This function shuts down a device interface and removes it
6179 * from the kernel tables.
6181 * This is just a wrapper for unregister_netdevice that takes
6182 * the rtnl semaphore. In general you want to use this and not
6183 * unregister_netdevice.
6185 void unregister_netdev(struct net_device *dev)
6188 unregister_netdevice(dev);
6191 EXPORT_SYMBOL(unregister_netdev);
6194 * dev_change_net_namespace - move device to different nethost namespace
6196 * @net: network namespace
6197 * @pat: If not NULL name pattern to try if the current device name
6198 * is already taken in the destination network namespace.
6200 * This function shuts down a device interface and moves it
6201 * to a new network namespace. On success 0 is returned, on
6202 * a failure a netagive errno code is returned.
6204 * Callers must hold the rtnl semaphore.
6207 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6213 /* Don't allow namespace local devices to be moved. */
6215 if (dev->features & NETIF_F_NETNS_LOCAL)
6218 /* Ensure the device has been registrered */
6220 if (dev->reg_state != NETREG_REGISTERED)
6223 /* Get out if there is nothing todo */
6225 if (net_eq(dev_net(dev), net))
6228 /* Pick the destination device name, and ensure
6229 * we can use it in the destination network namespace.
6232 if (__dev_get_by_name(net, dev->name)) {
6233 /* We get here if we can't use the current device name */
6236 if (dev_get_valid_name(dev, pat) < 0)
6241 * And now a mini version of register_netdevice unregister_netdevice.
6244 /* If device is running close it first. */
6247 /* And unlink it from device chain */
6249 unlist_netdevice(dev);
6253 /* Shutdown queueing discipline. */
6256 /* Notify protocols, that we are about to destroy
6257 this device. They should clean all the things.
6259 Note that dev->reg_state stays at NETREG_REGISTERED.
6260 This is wanted because this way 8021q and macvlan know
6261 the device is just moving and can keep their slaves up.
6263 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6264 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6265 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6268 * Flush the unicast and multicast chains
6273 /* Actually switch the network namespace */
6274 dev_net_set(dev, net);
6276 /* If there is an ifindex conflict assign a new one */
6277 if (__dev_get_by_index(net, dev->ifindex)) {
6278 int iflink = (dev->iflink == dev->ifindex);
6279 dev->ifindex = dev_new_index(net);
6281 dev->iflink = dev->ifindex;
6284 /* Fixup kobjects */
6285 err = device_rename(&dev->dev, dev->name);
6288 /* Add the device back in the hashes */
6289 list_netdevice(dev);
6291 /* Notify protocols, that a new device appeared. */
6292 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6295 * Prevent userspace races by waiting until the network
6296 * device is fully setup before sending notifications.
6298 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6305 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6307 static int dev_cpu_callback(struct notifier_block *nfb,
6308 unsigned long action,
6311 struct sk_buff **list_skb;
6312 struct sk_buff *skb;
6313 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6314 struct softnet_data *sd, *oldsd;
6316 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6319 local_irq_disable();
6320 cpu = smp_processor_id();
6321 sd = &per_cpu(softnet_data, cpu);
6322 oldsd = &per_cpu(softnet_data, oldcpu);
6324 /* Find end of our completion_queue. */
6325 list_skb = &sd->completion_queue;
6327 list_skb = &(*list_skb)->next;
6328 /* Append completion queue from offline CPU. */
6329 *list_skb = oldsd->completion_queue;
6330 oldsd->completion_queue = NULL;
6332 /* Append output queue from offline CPU. */
6333 if (oldsd->output_queue) {
6334 *sd->output_queue_tailp = oldsd->output_queue;
6335 sd->output_queue_tailp = oldsd->output_queue_tailp;
6336 oldsd->output_queue = NULL;
6337 oldsd->output_queue_tailp = &oldsd->output_queue;
6339 /* Append NAPI poll list from offline CPU, with one exception :
6340 * process_backlog() must be called by cpu owning percpu backlog.
6341 * We properly handle process_queue & input_pkt_queue later.
6343 while (!list_empty(&oldsd->poll_list)) {
6344 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
6348 list_del_init(&napi->poll_list);
6349 if (napi->poll == process_backlog)
6352 ____napi_schedule(sd, napi);
6355 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6358 /* Process offline CPU's input_pkt_queue */
6359 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6361 input_queue_head_incr(oldsd);
6363 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
6365 input_queue_head_incr(oldsd);
6373 * netdev_increment_features - increment feature set by one
6374 * @all: current feature set
6375 * @one: new feature set
6376 * @mask: mask feature set
6378 * Computes a new feature set after adding a device with feature set
6379 * @one to the master device with current feature set @all. Will not
6380 * enable anything that is off in @mask. Returns the new feature set.
6382 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6384 if (mask & NETIF_F_GEN_CSUM)
6385 mask |= NETIF_F_ALL_CSUM;
6386 mask |= NETIF_F_VLAN_CHALLENGED;
6388 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6389 all &= one | ~NETIF_F_ALL_FOR_ALL;
6391 /* If device needs checksumming, downgrade to it. */
6392 if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
6393 all &= ~NETIF_F_NO_CSUM;
6395 /* If one device supports hw checksumming, set for all. */
6396 if (all & NETIF_F_GEN_CSUM)
6397 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6401 EXPORT_SYMBOL(netdev_increment_features);
6403 static struct hlist_head *netdev_create_hash(void)
6406 struct hlist_head *hash;
6408 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6410 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6411 INIT_HLIST_HEAD(&hash[i]);
6416 /* Initialize per network namespace state */
6417 static int __net_init netdev_init(struct net *net)
6419 if (net != &init_net)
6420 INIT_LIST_HEAD(&net->dev_base_head);
6422 net->dev_name_head = netdev_create_hash();
6423 if (net->dev_name_head == NULL)
6426 net->dev_index_head = netdev_create_hash();
6427 if (net->dev_index_head == NULL)
6433 kfree(net->dev_name_head);
6439 * netdev_drivername - network driver for the device
6440 * @dev: network device
6442 * Determine network driver for device.
6444 const char *netdev_drivername(const struct net_device *dev)
6446 const struct device_driver *driver;
6447 const struct device *parent;
6448 const char *empty = "";
6450 parent = dev->dev.parent;
6454 driver = parent->driver;
6455 if (driver && driver->name)
6456 return driver->name;
6460 int __netdev_printk(const char *level, const struct net_device *dev,
6461 struct va_format *vaf)
6465 if (dev && dev->dev.parent)
6466 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6467 netdev_name(dev), vaf);
6469 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6471 r = printk("%s(NULL net_device): %pV", level, vaf);
6475 EXPORT_SYMBOL(__netdev_printk);
6477 int netdev_printk(const char *level, const struct net_device *dev,
6478 const char *format, ...)
6480 struct va_format vaf;
6484 va_start(args, format);
6489 r = __netdev_printk(level, dev, &vaf);
6494 EXPORT_SYMBOL(netdev_printk);
6496 #define define_netdev_printk_level(func, level) \
6497 int func(const struct net_device *dev, const char *fmt, ...) \
6500 struct va_format vaf; \
6503 va_start(args, fmt); \
6508 r = __netdev_printk(level, dev, &vaf); \
6513 EXPORT_SYMBOL(func);
6515 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6516 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6517 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6518 define_netdev_printk_level(netdev_err, KERN_ERR);
6519 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6520 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6521 define_netdev_printk_level(netdev_info, KERN_INFO);
6523 static void __net_exit netdev_exit(struct net *net)
6525 kfree(net->dev_name_head);
6526 kfree(net->dev_index_head);
6529 static struct pernet_operations __net_initdata netdev_net_ops = {
6530 .init = netdev_init,
6531 .exit = netdev_exit,
6534 static void __net_exit default_device_exit(struct net *net)
6536 struct net_device *dev, *aux;
6538 * Push all migratable network devices back to the
6539 * initial network namespace
6542 for_each_netdev_safe(net, dev, aux) {
6544 char fb_name[IFNAMSIZ];
6546 /* Ignore unmoveable devices (i.e. loopback) */
6547 if (dev->features & NETIF_F_NETNS_LOCAL)
6550 /* Leave virtual devices for the generic cleanup */
6551 if (dev->rtnl_link_ops)
6554 /* Push remaining network devices to init_net */
6555 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6556 err = dev_change_net_namespace(dev, &init_net, fb_name);
6558 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6559 __func__, dev->name, err);
6566 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6568 /* At exit all network devices most be removed from a network
6569 * namespace. Do this in the reverse order of registration.
6570 * Do this across as many network namespaces as possible to
6571 * improve batching efficiency.
6573 struct net_device *dev;
6575 LIST_HEAD(dev_kill_list);
6578 list_for_each_entry(net, net_list, exit_list) {
6579 for_each_netdev_reverse(net, dev) {
6580 if (dev->rtnl_link_ops)
6581 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6583 unregister_netdevice_queue(dev, &dev_kill_list);
6586 unregister_netdevice_many(&dev_kill_list);
6587 list_del(&dev_kill_list);
6591 static struct pernet_operations __net_initdata default_device_ops = {
6592 .exit = default_device_exit,
6593 .exit_batch = default_device_exit_batch,
6597 * Initialize the DEV module. At boot time this walks the device list and
6598 * unhooks any devices that fail to initialise (normally hardware not
6599 * present) and leaves us with a valid list of present and active devices.
6604 * This is called single threaded during boot, so no need
6605 * to take the rtnl semaphore.
6607 static int __init net_dev_init(void)
6609 int i, rc = -ENOMEM;
6611 BUG_ON(!dev_boot_phase);
6613 if (dev_proc_init())
6616 if (netdev_kobject_init())
6619 INIT_LIST_HEAD(&ptype_all);
6620 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6621 INIT_LIST_HEAD(&ptype_base[i]);
6623 if (register_pernet_subsys(&netdev_net_ops))
6627 * Initialise the packet receive queues.
6630 for_each_possible_cpu(i) {
6631 struct softnet_data *sd = &per_cpu(softnet_data, i);
6633 memset(sd, 0, sizeof(*sd));
6634 skb_queue_head_init(&sd->input_pkt_queue);
6635 skb_queue_head_init(&sd->process_queue);
6636 sd->completion_queue = NULL;
6637 INIT_LIST_HEAD(&sd->poll_list);
6638 sd->output_queue = NULL;
6639 sd->output_queue_tailp = &sd->output_queue;
6641 sd->csd.func = rps_trigger_softirq;
6647 sd->backlog.poll = process_backlog;
6648 sd->backlog.weight = weight_p;
6649 sd->backlog.gro_list = NULL;
6650 sd->backlog.gro_count = 0;
6655 /* The loopback device is special if any other network devices
6656 * is present in a network namespace the loopback device must
6657 * be present. Since we now dynamically allocate and free the
6658 * loopback device ensure this invariant is maintained by
6659 * keeping the loopback device as the first device on the
6660 * list of network devices. Ensuring the loopback devices
6661 * is the first device that appears and the last network device
6664 if (register_pernet_device(&loopback_net_ops))
6667 if (register_pernet_device(&default_device_ops))
6670 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6671 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6673 hotcpu_notifier(dev_cpu_callback, 0);
6681 subsys_initcall(net_dev_init);
6683 static int __init initialize_hashrnd(void)
6685 get_random_bytes(&hashrnd, sizeof(hashrnd));
6689 late_initcall_sync(initialize_hashrnd);