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 == '/' || 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);
1622 nf_reset_trace(skb);
1623 return netif_rx(skb);
1625 EXPORT_SYMBOL_GPL(dev_forward_skb);
1627 static inline int deliver_skb(struct sk_buff *skb,
1628 struct packet_type *pt_prev,
1629 struct net_device *orig_dev)
1631 atomic_inc(&skb->users);
1632 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1635 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1637 if (!ptype->af_packet_priv || !skb->sk)
1640 if (ptype->id_match)
1641 return ptype->id_match(ptype, skb->sk);
1642 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1649 * Support routine. Sends outgoing frames to any network
1650 * taps currently in use.
1653 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1655 struct packet_type *ptype;
1656 struct sk_buff *skb2 = NULL;
1657 struct packet_type *pt_prev = NULL;
1660 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1661 /* Never send packets back to the socket
1662 * they originated from - MvS (miquels@drinkel.ow.org)
1664 if ((ptype->dev == dev || !ptype->dev) &&
1665 (!skb_loop_sk(ptype, skb))) {
1667 deliver_skb(skb2, pt_prev, skb->dev);
1672 skb2 = skb_clone(skb, GFP_ATOMIC);
1676 net_timestamp_set(skb2);
1678 /* skb->nh should be correctly
1679 set by sender, so that the second statement is
1680 just protection against buggy protocols.
1682 skb_reset_mac_header(skb2);
1684 if (skb_network_header(skb2) < skb2->data ||
1685 skb2->network_header > skb2->tail) {
1686 if (net_ratelimit())
1687 printk(KERN_CRIT "protocol %04x is "
1689 ntohs(skb2->protocol),
1691 skb_reset_network_header(skb2);
1694 skb2->transport_header = skb2->network_header;
1695 skb2->pkt_type = PACKET_OUTGOING;
1700 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1704 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1705 * @dev: Network device
1706 * @txq: number of queues available
1708 * If real_num_tx_queues is changed the tc mappings may no longer be
1709 * valid. To resolve this verify the tc mapping remains valid and if
1710 * not NULL the mapping. With no priorities mapping to this
1711 * offset/count pair it will no longer be used. In the worst case TC0
1712 * is invalid nothing can be done so disable priority mappings. If is
1713 * expected that drivers will fix this mapping if they can before
1714 * calling netif_set_real_num_tx_queues.
1716 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1719 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1721 /* If TC0 is invalidated disable TC mapping */
1722 if (tc->offset + tc->count > txq) {
1723 pr_warning("Number of in use tx queues changed "
1724 "invalidating tc mappings. Priority "
1725 "traffic classification disabled!\n");
1730 /* Invalidated prio to tc mappings set to TC0 */
1731 for (i = 1; i < TC_BITMASK + 1; i++) {
1732 int q = netdev_get_prio_tc_map(dev, i);
1734 tc = &dev->tc_to_txq[q];
1735 if (tc->offset + tc->count > txq) {
1736 pr_warning("Number of in use tx queues "
1737 "changed. Priority %i to tc "
1738 "mapping %i is no longer valid "
1739 "setting map to 0\n",
1741 netdev_set_prio_tc_map(dev, i, 0);
1747 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1748 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1750 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1754 if (txq < 1 || txq > dev->num_tx_queues)
1757 if (dev->reg_state == NETREG_REGISTERED ||
1758 dev->reg_state == NETREG_UNREGISTERING) {
1761 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1767 netif_setup_tc(dev, txq);
1769 if (txq < dev->real_num_tx_queues)
1770 qdisc_reset_all_tx_gt(dev, txq);
1773 dev->real_num_tx_queues = txq;
1776 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1780 * netif_set_real_num_rx_queues - set actual number of RX queues used
1781 * @dev: Network device
1782 * @rxq: Actual number of RX queues
1784 * This must be called either with the rtnl_lock held or before
1785 * registration of the net device. Returns 0 on success, or a
1786 * negative error code. If called before registration, it always
1789 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1793 if (rxq < 1 || rxq > dev->num_rx_queues)
1796 if (dev->reg_state == NETREG_REGISTERED) {
1799 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1805 dev->real_num_rx_queues = rxq;
1808 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1811 static inline void __netif_reschedule(struct Qdisc *q)
1813 struct softnet_data *sd;
1814 unsigned long flags;
1816 local_irq_save(flags);
1817 sd = &__get_cpu_var(softnet_data);
1818 q->next_sched = NULL;
1819 *sd->output_queue_tailp = q;
1820 sd->output_queue_tailp = &q->next_sched;
1821 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1822 local_irq_restore(flags);
1825 void __netif_schedule(struct Qdisc *q)
1827 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1828 __netif_reschedule(q);
1830 EXPORT_SYMBOL(__netif_schedule);
1832 void dev_kfree_skb_irq(struct sk_buff *skb)
1834 if (atomic_dec_and_test(&skb->users)) {
1835 struct softnet_data *sd;
1836 unsigned long flags;
1838 local_irq_save(flags);
1839 sd = &__get_cpu_var(softnet_data);
1840 skb->next = sd->completion_queue;
1841 sd->completion_queue = skb;
1842 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1843 local_irq_restore(flags);
1846 EXPORT_SYMBOL(dev_kfree_skb_irq);
1848 void dev_kfree_skb_any(struct sk_buff *skb)
1850 if (in_irq() || irqs_disabled())
1851 dev_kfree_skb_irq(skb);
1855 EXPORT_SYMBOL(dev_kfree_skb_any);
1859 * netif_device_detach - mark device as removed
1860 * @dev: network device
1862 * Mark device as removed from system and therefore no longer available.
1864 void netif_device_detach(struct net_device *dev)
1866 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1867 netif_running(dev)) {
1868 netif_tx_stop_all_queues(dev);
1871 EXPORT_SYMBOL(netif_device_detach);
1874 * netif_device_attach - mark device as attached
1875 * @dev: network device
1877 * Mark device as attached from system and restart if needed.
1879 void netif_device_attach(struct net_device *dev)
1881 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1882 netif_running(dev)) {
1883 netif_tx_wake_all_queues(dev);
1884 __netdev_watchdog_up(dev);
1887 EXPORT_SYMBOL(netif_device_attach);
1890 * Invalidate hardware checksum when packet is to be mangled, and
1891 * complete checksum manually on outgoing path.
1893 int skb_checksum_help(struct sk_buff *skb)
1896 int ret = 0, offset;
1898 if (skb->ip_summed == CHECKSUM_COMPLETE)
1899 goto out_set_summed;
1901 if (unlikely(skb_shinfo(skb)->gso_size)) {
1902 /* Let GSO fix up the checksum. */
1903 goto out_set_summed;
1906 offset = skb_checksum_start_offset(skb);
1907 BUG_ON(offset >= skb_headlen(skb));
1908 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1910 offset += skb->csum_offset;
1911 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1913 if (skb_cloned(skb) &&
1914 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1915 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1920 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1922 skb->ip_summed = CHECKSUM_NONE;
1926 EXPORT_SYMBOL(skb_checksum_help);
1929 * skb_gso_segment - Perform segmentation on skb.
1930 * @skb: buffer to segment
1931 * @features: features for the output path (see dev->features)
1933 * This function segments the given skb and returns a list of segments.
1935 * It may return NULL if the skb requires no segmentation. This is
1936 * only possible when GSO is used for verifying header integrity.
1938 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1940 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1941 struct packet_type *ptype;
1942 __be16 type = skb->protocol;
1943 int vlan_depth = ETH_HLEN;
1946 while (type == htons(ETH_P_8021Q)) {
1947 struct vlan_hdr *vh;
1949 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1950 return ERR_PTR(-EINVAL);
1952 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1953 type = vh->h_vlan_encapsulated_proto;
1954 vlan_depth += VLAN_HLEN;
1957 skb_reset_mac_header(skb);
1958 skb->mac_len = skb->network_header - skb->mac_header;
1959 __skb_pull(skb, skb->mac_len);
1961 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1962 struct net_device *dev = skb->dev;
1963 struct ethtool_drvinfo info = {};
1965 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1966 dev->ethtool_ops->get_drvinfo(dev, &info);
1968 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1969 info.driver, dev ? dev->features : 0L,
1970 skb->sk ? skb->sk->sk_route_caps : 0L,
1971 skb->len, skb->data_len, skb->ip_summed);
1973 if (skb_header_cloned(skb) &&
1974 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1975 return ERR_PTR(err);
1979 list_for_each_entry_rcu(ptype,
1980 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1981 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1982 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1983 err = ptype->gso_send_check(skb);
1984 segs = ERR_PTR(err);
1985 if (err || skb_gso_ok(skb, features))
1987 __skb_push(skb, (skb->data -
1988 skb_network_header(skb)));
1990 segs = ptype->gso_segment(skb, features);
1996 __skb_push(skb, skb->data - skb_mac_header(skb));
2000 EXPORT_SYMBOL(skb_gso_segment);
2002 /* Take action when hardware reception checksum errors are detected. */
2004 void netdev_rx_csum_fault(struct net_device *dev)
2006 if (net_ratelimit()) {
2007 printk(KERN_ERR "%s: hw csum failure.\n",
2008 dev ? dev->name : "<unknown>");
2012 EXPORT_SYMBOL(netdev_rx_csum_fault);
2015 /* Actually, we should eliminate this check as soon as we know, that:
2016 * 1. IOMMU is present and allows to map all the memory.
2017 * 2. No high memory really exists on this machine.
2020 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2022 #ifdef CONFIG_HIGHMEM
2024 if (!(dev->features & NETIF_F_HIGHDMA)) {
2025 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2026 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2027 if (PageHighMem(skb_frag_page(frag)))
2032 if (PCI_DMA_BUS_IS_PHYS) {
2033 struct device *pdev = dev->dev.parent;
2037 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2038 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2039 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2040 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2049 void (*destructor)(struct sk_buff *skb);
2052 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2054 static void dev_gso_skb_destructor(struct sk_buff *skb)
2056 struct dev_gso_cb *cb;
2059 struct sk_buff *nskb = skb->next;
2061 skb->next = nskb->next;
2064 } while (skb->next);
2066 cb = DEV_GSO_CB(skb);
2068 cb->destructor(skb);
2072 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2073 * @skb: buffer to segment
2074 * @features: device features as applicable to this skb
2076 * This function segments the given skb and stores the list of segments
2079 static int dev_gso_segment(struct sk_buff *skb, int features)
2081 struct sk_buff *segs;
2083 segs = skb_gso_segment(skb, features);
2085 /* Verifying header integrity only. */
2090 return PTR_ERR(segs);
2093 DEV_GSO_CB(skb)->destructor = skb->destructor;
2094 skb->destructor = dev_gso_skb_destructor;
2099 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2101 return ((features & NETIF_F_GEN_CSUM) ||
2102 ((features & NETIF_F_V4_CSUM) &&
2103 protocol == htons(ETH_P_IP)) ||
2104 ((features & NETIF_F_V6_CSUM) &&
2105 protocol == htons(ETH_P_IPV6)) ||
2106 ((features & NETIF_F_FCOE_CRC) &&
2107 protocol == htons(ETH_P_FCOE)));
2110 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2112 if (skb->ip_summed != CHECKSUM_NONE &&
2113 !can_checksum_protocol(features, protocol)) {
2114 features &= ~NETIF_F_ALL_CSUM;
2115 features &= ~NETIF_F_SG;
2116 } else if (illegal_highdma(skb->dev, skb)) {
2117 features &= ~NETIF_F_SG;
2123 u32 netif_skb_features(struct sk_buff *skb)
2125 __be16 protocol = skb->protocol;
2126 u32 features = skb->dev->features;
2128 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2129 features &= ~NETIF_F_GSO_MASK;
2131 if (protocol == htons(ETH_P_8021Q)) {
2132 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2133 protocol = veh->h_vlan_encapsulated_proto;
2134 } else if (!vlan_tx_tag_present(skb)) {
2135 return harmonize_features(skb, protocol, features);
2138 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2140 if (protocol != htons(ETH_P_8021Q)) {
2141 return harmonize_features(skb, protocol, features);
2143 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2144 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2145 return harmonize_features(skb, protocol, features);
2148 EXPORT_SYMBOL(netif_skb_features);
2151 * Returns true if either:
2152 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2153 * 2. skb is fragmented and the device does not support SG, or if
2154 * at least one of fragments is in highmem and device does not
2155 * support DMA from it.
2157 static inline int skb_needs_linearize(struct sk_buff *skb,
2160 return skb_is_nonlinear(skb) &&
2161 ((skb_has_frag_list(skb) &&
2162 !(features & NETIF_F_FRAGLIST)) ||
2163 (skb_shinfo(skb)->nr_frags &&
2164 !(features & NETIF_F_SG)));
2167 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2168 struct netdev_queue *txq)
2170 const struct net_device_ops *ops = dev->netdev_ops;
2171 int rc = NETDEV_TX_OK;
2172 unsigned int skb_len;
2174 if (likely(!skb->next)) {
2178 * If device doesn't need skb->dst, release it right now while
2179 * its hot in this cpu cache
2181 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2184 if (!list_empty(&ptype_all))
2185 dev_queue_xmit_nit(skb, dev);
2187 features = netif_skb_features(skb);
2189 if (vlan_tx_tag_present(skb) &&
2190 !(features & NETIF_F_HW_VLAN_TX)) {
2191 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2198 if (netif_needs_gso(skb, features)) {
2199 if (unlikely(dev_gso_segment(skb, features)))
2204 if (skb_needs_linearize(skb, features) &&
2205 __skb_linearize(skb))
2208 /* If packet is not checksummed and device does not
2209 * support checksumming for this protocol, complete
2210 * checksumming here.
2212 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2213 skb_set_transport_header(skb,
2214 skb_checksum_start_offset(skb));
2215 if (!(features & NETIF_F_ALL_CSUM) &&
2216 skb_checksum_help(skb))
2222 rc = ops->ndo_start_xmit(skb, dev);
2223 trace_net_dev_xmit(skb, rc, dev, skb_len);
2224 if (rc == NETDEV_TX_OK)
2225 txq_trans_update(txq);
2231 struct sk_buff *nskb = skb->next;
2233 skb->next = nskb->next;
2237 * If device doesn't need nskb->dst, release it right now while
2238 * its hot in this cpu cache
2240 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2243 skb_len = nskb->len;
2244 rc = ops->ndo_start_xmit(nskb, dev);
2245 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2246 if (unlikely(rc != NETDEV_TX_OK)) {
2247 if (rc & ~NETDEV_TX_MASK)
2248 goto out_kfree_gso_skb;
2249 nskb->next = skb->next;
2253 txq_trans_update(txq);
2254 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2255 return NETDEV_TX_BUSY;
2256 } while (skb->next);
2259 if (likely(skb->next == NULL))
2260 skb->destructor = DEV_GSO_CB(skb)->destructor;
2267 static u32 hashrnd __read_mostly;
2270 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2271 * to be used as a distribution range.
2273 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2274 unsigned int num_tx_queues)
2278 u16 qcount = num_tx_queues;
2280 if (skb_rx_queue_recorded(skb)) {
2281 hash = skb_get_rx_queue(skb);
2282 while (unlikely(hash >= num_tx_queues))
2283 hash -= num_tx_queues;
2288 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2289 qoffset = dev->tc_to_txq[tc].offset;
2290 qcount = dev->tc_to_txq[tc].count;
2293 if (skb->sk && skb->sk->sk_hash)
2294 hash = skb->sk->sk_hash;
2296 hash = (__force u16) skb->protocol;
2297 hash = jhash_1word(hash, hashrnd);
2299 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2301 EXPORT_SYMBOL(__skb_tx_hash);
2303 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2305 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2306 if (net_ratelimit()) {
2307 pr_warning("%s selects TX queue %d, but "
2308 "real number of TX queues is %d\n",
2309 dev->name, queue_index, dev->real_num_tx_queues);
2316 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2319 struct xps_dev_maps *dev_maps;
2320 struct xps_map *map;
2321 int queue_index = -1;
2324 dev_maps = rcu_dereference(dev->xps_maps);
2326 map = rcu_dereference(
2327 dev_maps->cpu_map[raw_smp_processor_id()]);
2330 queue_index = map->queues[0];
2333 if (skb->sk && skb->sk->sk_hash)
2334 hash = skb->sk->sk_hash;
2336 hash = (__force u16) skb->protocol ^
2338 hash = jhash_1word(hash, hashrnd);
2339 queue_index = map->queues[
2340 ((u64)hash * map->len) >> 32];
2342 if (unlikely(queue_index >= dev->real_num_tx_queues))
2354 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2355 struct sk_buff *skb)
2358 const struct net_device_ops *ops = dev->netdev_ops;
2360 if (dev->real_num_tx_queues == 1)
2362 else if (ops->ndo_select_queue) {
2363 queue_index = ops->ndo_select_queue(dev, skb);
2364 queue_index = dev_cap_txqueue(dev, queue_index);
2366 struct sock *sk = skb->sk;
2367 queue_index = sk_tx_queue_get(sk);
2369 if (queue_index < 0 || skb->ooo_okay ||
2370 queue_index >= dev->real_num_tx_queues) {
2371 int old_index = queue_index;
2373 queue_index = get_xps_queue(dev, skb);
2374 if (queue_index < 0)
2375 queue_index = skb_tx_hash(dev, skb);
2377 if (queue_index != old_index && sk) {
2378 struct dst_entry *dst =
2379 rcu_dereference_check(sk->sk_dst_cache, 1);
2381 if (dst && skb_dst(skb) == dst)
2382 sk_tx_queue_set(sk, queue_index);
2387 skb_set_queue_mapping(skb, queue_index);
2388 return netdev_get_tx_queue(dev, queue_index);
2391 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2392 struct net_device *dev,
2393 struct netdev_queue *txq)
2395 spinlock_t *root_lock = qdisc_lock(q);
2399 qdisc_skb_cb(skb)->pkt_len = skb->len;
2400 qdisc_calculate_pkt_len(skb, q);
2402 * Heuristic to force contended enqueues to serialize on a
2403 * separate lock before trying to get qdisc main lock.
2404 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2405 * and dequeue packets faster.
2407 contended = qdisc_is_running(q);
2408 if (unlikely(contended))
2409 spin_lock(&q->busylock);
2411 spin_lock(root_lock);
2412 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2415 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2416 qdisc_run_begin(q)) {
2418 * This is a work-conserving queue; there are no old skbs
2419 * waiting to be sent out; and the qdisc is not running -
2420 * xmit the skb directly.
2422 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2425 qdisc_bstats_update(q, skb);
2427 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2428 if (unlikely(contended)) {
2429 spin_unlock(&q->busylock);
2436 rc = NET_XMIT_SUCCESS;
2439 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2440 if (qdisc_run_begin(q)) {
2441 if (unlikely(contended)) {
2442 spin_unlock(&q->busylock);
2448 spin_unlock(root_lock);
2449 if (unlikely(contended))
2450 spin_unlock(&q->busylock);
2454 static DEFINE_PER_CPU(int, xmit_recursion);
2455 #define RECURSION_LIMIT 10
2458 * dev_queue_xmit - transmit a buffer
2459 * @skb: buffer to transmit
2461 * Queue a buffer for transmission to a network device. The caller must
2462 * have set the device and priority and built the buffer before calling
2463 * this function. The function can be called from an interrupt.
2465 * A negative errno code is returned on a failure. A success does not
2466 * guarantee the frame will be transmitted as it may be dropped due
2467 * to congestion or traffic shaping.
2469 * -----------------------------------------------------------------------------------
2470 * I notice this method can also return errors from the queue disciplines,
2471 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2474 * Regardless of the return value, the skb is consumed, so it is currently
2475 * difficult to retry a send to this method. (You can bump the ref count
2476 * before sending to hold a reference for retry if you are careful.)
2478 * When calling this method, interrupts MUST be enabled. This is because
2479 * the BH enable code must have IRQs enabled so that it will not deadlock.
2482 int dev_queue_xmit(struct sk_buff *skb)
2484 struct net_device *dev = skb->dev;
2485 struct netdev_queue *txq;
2489 /* Disable soft irqs for various locks below. Also
2490 * stops preemption for RCU.
2494 txq = dev_pick_tx(dev, skb);
2495 q = rcu_dereference_bh(txq->qdisc);
2497 #ifdef CONFIG_NET_CLS_ACT
2498 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2500 trace_net_dev_queue(skb);
2502 rc = __dev_xmit_skb(skb, q, dev, txq);
2506 /* The device has no queue. Common case for software devices:
2507 loopback, all the sorts of tunnels...
2509 Really, it is unlikely that netif_tx_lock protection is necessary
2510 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2512 However, it is possible, that they rely on protection
2515 Check this and shot the lock. It is not prone from deadlocks.
2516 Either shot noqueue qdisc, it is even simpler 8)
2518 if (dev->flags & IFF_UP) {
2519 int cpu = smp_processor_id(); /* ok because BHs are off */
2521 if (txq->xmit_lock_owner != cpu) {
2523 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2524 goto recursion_alert;
2526 HARD_TX_LOCK(dev, txq, cpu);
2528 if (!netif_tx_queue_stopped(txq)) {
2529 __this_cpu_inc(xmit_recursion);
2530 rc = dev_hard_start_xmit(skb, dev, txq);
2531 __this_cpu_dec(xmit_recursion);
2532 if (dev_xmit_complete(rc)) {
2533 HARD_TX_UNLOCK(dev, txq);
2537 HARD_TX_UNLOCK(dev, txq);
2538 if (net_ratelimit())
2539 printk(KERN_CRIT "Virtual device %s asks to "
2540 "queue packet!\n", dev->name);
2542 /* Recursion is detected! It is possible,
2546 if (net_ratelimit())
2547 printk(KERN_CRIT "Dead loop on virtual device "
2548 "%s, fix it urgently!\n", dev->name);
2553 rcu_read_unlock_bh();
2558 rcu_read_unlock_bh();
2561 EXPORT_SYMBOL(dev_queue_xmit);
2564 /*=======================================================================
2566 =======================================================================*/
2568 int netdev_max_backlog __read_mostly = 1000;
2569 int netdev_tstamp_prequeue __read_mostly = 1;
2570 int netdev_budget __read_mostly = 300;
2571 int weight_p __read_mostly = 64; /* old backlog weight */
2573 /* Called with irq disabled */
2574 static inline void ____napi_schedule(struct softnet_data *sd,
2575 struct napi_struct *napi)
2577 list_add_tail(&napi->poll_list, &sd->poll_list);
2578 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2582 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2583 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2584 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2585 * if hash is a canonical 4-tuple hash over transport ports.
2587 void __skb_get_rxhash(struct sk_buff *skb)
2589 int nhoff, hash = 0, poff;
2590 const struct ipv6hdr *ip6;
2591 const struct iphdr *ip;
2592 const struct vlan_hdr *vlan;
2601 nhoff = skb_network_offset(skb);
2602 proto = skb->protocol;
2606 case __constant_htons(ETH_P_IP):
2608 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2611 ip = (const struct iphdr *) (skb->data + nhoff);
2612 if (ip_is_fragment(ip))
2615 ip_proto = ip->protocol;
2616 addr1 = (__force u32) ip->saddr;
2617 addr2 = (__force u32) ip->daddr;
2618 nhoff += ip->ihl * 4;
2620 case __constant_htons(ETH_P_IPV6):
2622 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2625 ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
2626 ip_proto = ip6->nexthdr;
2627 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2628 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2631 case __constant_htons(ETH_P_8021Q):
2632 if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
2634 vlan = (const struct vlan_hdr *) (skb->data + nhoff);
2635 proto = vlan->h_vlan_encapsulated_proto;
2636 nhoff += sizeof(*vlan);
2638 case __constant_htons(ETH_P_PPP_SES):
2639 if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
2641 proto = *((__be16 *) (skb->data + nhoff +
2642 sizeof(struct pppoe_hdr)));
2643 nhoff += PPPOE_SES_HLEN;
2645 case __constant_htons(PPP_IP):
2647 case __constant_htons(PPP_IPV6):
2658 if (pskb_may_pull(skb, nhoff + 16)) {
2659 u8 *h = skb->data + nhoff;
2660 __be16 flags = *(__be16 *)h;
2663 * Only look inside GRE if version zero and no
2666 if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
2667 proto = *(__be16 *)(h + 2);
2669 if (flags & GRE_CSUM)
2671 if (flags & GRE_KEY)
2673 if (flags & GRE_SEQ)
2686 poff = proto_ports_offset(ip_proto);
2689 if (pskb_may_pull(skb, nhoff + 4)) {
2690 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2695 /* get a consistent hash (same value on both flow directions) */
2696 if (addr2 < addr1 ||
2698 ports.v16[1] < ports.v16[0])) {
2700 swap(ports.v16[0], ports.v16[1]);
2702 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2709 EXPORT_SYMBOL(__skb_get_rxhash);
2713 /* One global table that all flow-based protocols share. */
2714 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2715 EXPORT_SYMBOL(rps_sock_flow_table);
2717 static struct rps_dev_flow *
2718 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2719 struct rps_dev_flow *rflow, u16 next_cpu)
2721 if (next_cpu != RPS_NO_CPU) {
2722 #ifdef CONFIG_RFS_ACCEL
2723 struct netdev_rx_queue *rxqueue;
2724 struct rps_dev_flow_table *flow_table;
2725 struct rps_dev_flow *old_rflow;
2730 /* Should we steer this flow to a different hardware queue? */
2731 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2732 !(dev->features & NETIF_F_NTUPLE))
2734 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2735 if (rxq_index == skb_get_rx_queue(skb))
2738 rxqueue = dev->_rx + rxq_index;
2739 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2742 flow_id = skb->rxhash & flow_table->mask;
2743 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2744 rxq_index, flow_id);
2748 rflow = &flow_table->flows[flow_id];
2750 if (old_rflow->filter == rflow->filter)
2751 old_rflow->filter = RPS_NO_FILTER;
2755 per_cpu(softnet_data, next_cpu).input_queue_head;
2758 rflow->cpu = next_cpu;
2763 * get_rps_cpu is called from netif_receive_skb and returns the target
2764 * CPU from the RPS map of the receiving queue for a given skb.
2765 * rcu_read_lock must be held on entry.
2767 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2768 struct rps_dev_flow **rflowp)
2770 struct netdev_rx_queue *rxqueue;
2771 struct rps_map *map;
2772 struct rps_dev_flow_table *flow_table;
2773 struct rps_sock_flow_table *sock_flow_table;
2777 if (skb_rx_queue_recorded(skb)) {
2778 u16 index = skb_get_rx_queue(skb);
2779 if (unlikely(index >= dev->real_num_rx_queues)) {
2780 WARN_ONCE(dev->real_num_rx_queues > 1,
2781 "%s received packet on queue %u, but number "
2782 "of RX queues is %u\n",
2783 dev->name, index, dev->real_num_rx_queues);
2786 rxqueue = dev->_rx + index;
2790 map = rcu_dereference(rxqueue->rps_map);
2792 if (map->len == 1 &&
2793 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2794 tcpu = map->cpus[0];
2795 if (cpu_online(tcpu))
2799 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2803 skb_reset_network_header(skb);
2804 if (!skb_get_rxhash(skb))
2807 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2808 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2809 if (flow_table && sock_flow_table) {
2811 struct rps_dev_flow *rflow;
2813 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2816 next_cpu = sock_flow_table->ents[skb->rxhash &
2817 sock_flow_table->mask];
2820 * If the desired CPU (where last recvmsg was done) is
2821 * different from current CPU (one in the rx-queue flow
2822 * table entry), switch if one of the following holds:
2823 * - Current CPU is unset (equal to RPS_NO_CPU).
2824 * - Current CPU is offline.
2825 * - The current CPU's queue tail has advanced beyond the
2826 * last packet that was enqueued using this table entry.
2827 * This guarantees that all previous packets for the flow
2828 * have been dequeued, thus preserving in order delivery.
2830 if (unlikely(tcpu != next_cpu) &&
2831 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2832 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2833 rflow->last_qtail)) >= 0)) {
2835 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2838 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2846 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2848 if (cpu_online(tcpu)) {
2858 #ifdef CONFIG_RFS_ACCEL
2861 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2862 * @dev: Device on which the filter was set
2863 * @rxq_index: RX queue index
2864 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2865 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2867 * Drivers that implement ndo_rx_flow_steer() should periodically call
2868 * this function for each installed filter and remove the filters for
2869 * which it returns %true.
2871 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2872 u32 flow_id, u16 filter_id)
2874 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2875 struct rps_dev_flow_table *flow_table;
2876 struct rps_dev_flow *rflow;
2881 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2882 if (flow_table && flow_id <= flow_table->mask) {
2883 rflow = &flow_table->flows[flow_id];
2884 cpu = ACCESS_ONCE(rflow->cpu);
2885 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2886 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2887 rflow->last_qtail) <
2888 (int)(10 * flow_table->mask)))
2894 EXPORT_SYMBOL(rps_may_expire_flow);
2896 #endif /* CONFIG_RFS_ACCEL */
2898 /* Called from hardirq (IPI) context */
2899 static void rps_trigger_softirq(void *data)
2901 struct softnet_data *sd = data;
2903 ____napi_schedule(sd, &sd->backlog);
2907 #endif /* CONFIG_RPS */
2910 * Check if this softnet_data structure is another cpu one
2911 * If yes, queue it to our IPI list and return 1
2914 static int rps_ipi_queued(struct softnet_data *sd)
2917 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2920 sd->rps_ipi_next = mysd->rps_ipi_list;
2921 mysd->rps_ipi_list = sd;
2923 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2926 #endif /* CONFIG_RPS */
2931 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2932 * queue (may be a remote CPU queue).
2934 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2935 unsigned int *qtail)
2937 struct softnet_data *sd;
2938 unsigned long flags;
2940 sd = &per_cpu(softnet_data, cpu);
2942 local_irq_save(flags);
2945 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2946 if (skb_queue_len(&sd->input_pkt_queue)) {
2948 __skb_queue_tail(&sd->input_pkt_queue, skb);
2949 input_queue_tail_incr_save(sd, qtail);
2951 local_irq_restore(flags);
2952 return NET_RX_SUCCESS;
2955 /* Schedule NAPI for backlog device
2956 * We can use non atomic operation since we own the queue lock
2958 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2959 if (!rps_ipi_queued(sd))
2960 ____napi_schedule(sd, &sd->backlog);
2968 local_irq_restore(flags);
2970 atomic_long_inc(&skb->dev->rx_dropped);
2976 * netif_rx - post buffer to the network code
2977 * @skb: buffer to post
2979 * This function receives a packet from a device driver and queues it for
2980 * the upper (protocol) levels to process. It always succeeds. The buffer
2981 * may be dropped during processing for congestion control or by the
2985 * NET_RX_SUCCESS (no congestion)
2986 * NET_RX_DROP (packet was dropped)
2990 int netif_rx(struct sk_buff *skb)
2994 /* if netpoll wants it, pretend we never saw it */
2995 if (netpoll_rx(skb))
2998 if (netdev_tstamp_prequeue)
2999 net_timestamp_check(skb);
3001 trace_netif_rx(skb);
3004 struct rps_dev_flow voidflow, *rflow = &voidflow;
3010 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3012 cpu = smp_processor_id();
3014 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3022 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3028 EXPORT_SYMBOL(netif_rx);
3030 int netif_rx_ni(struct sk_buff *skb)
3035 err = netif_rx(skb);
3036 if (local_softirq_pending())
3042 EXPORT_SYMBOL(netif_rx_ni);
3044 static void net_tx_action(struct softirq_action *h)
3046 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3048 if (sd->completion_queue) {
3049 struct sk_buff *clist;
3051 local_irq_disable();
3052 clist = sd->completion_queue;
3053 sd->completion_queue = NULL;
3057 struct sk_buff *skb = clist;
3058 clist = clist->next;
3060 WARN_ON(atomic_read(&skb->users));
3061 trace_kfree_skb(skb, net_tx_action);
3066 if (sd->output_queue) {
3069 local_irq_disable();
3070 head = sd->output_queue;
3071 sd->output_queue = NULL;
3072 sd->output_queue_tailp = &sd->output_queue;
3076 struct Qdisc *q = head;
3077 spinlock_t *root_lock;
3079 head = head->next_sched;
3081 root_lock = qdisc_lock(q);
3082 if (spin_trylock(root_lock)) {
3083 smp_mb__before_clear_bit();
3084 clear_bit(__QDISC_STATE_SCHED,
3087 spin_unlock(root_lock);
3089 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3091 __netif_reschedule(q);
3093 smp_mb__before_clear_bit();
3094 clear_bit(__QDISC_STATE_SCHED,
3102 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3103 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3104 /* This hook is defined here for ATM LANE */
3105 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3106 unsigned char *addr) __read_mostly;
3107 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3110 #ifdef CONFIG_NET_CLS_ACT
3111 /* TODO: Maybe we should just force sch_ingress to be compiled in
3112 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3113 * a compare and 2 stores extra right now if we dont have it on
3114 * but have CONFIG_NET_CLS_ACT
3115 * NOTE: This doesn't stop any functionality; if you dont have
3116 * the ingress scheduler, you just can't add policies on ingress.
3119 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3121 struct net_device *dev = skb->dev;
3122 u32 ttl = G_TC_RTTL(skb->tc_verd);
3123 int result = TC_ACT_OK;
3126 if (unlikely(MAX_RED_LOOP < ttl++)) {
3127 if (net_ratelimit())
3128 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3129 skb->skb_iif, dev->ifindex);
3133 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3134 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3137 if (q != &noop_qdisc) {
3138 spin_lock(qdisc_lock(q));
3139 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3140 result = qdisc_enqueue_root(skb, q);
3141 spin_unlock(qdisc_lock(q));
3147 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3148 struct packet_type **pt_prev,
3149 int *ret, struct net_device *orig_dev)
3151 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3153 if (!rxq || rxq->qdisc == &noop_qdisc)
3157 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3161 switch (ing_filter(skb, rxq)) {
3175 * netdev_rx_handler_register - register receive handler
3176 * @dev: device to register a handler for
3177 * @rx_handler: receive handler to register
3178 * @rx_handler_data: data pointer that is used by rx handler
3180 * Register a receive hander for a device. This handler will then be
3181 * called from __netif_receive_skb. A negative errno code is returned
3184 * The caller must hold the rtnl_mutex.
3186 * For a general description of rx_handler, see enum rx_handler_result.
3188 int netdev_rx_handler_register(struct net_device *dev,
3189 rx_handler_func_t *rx_handler,
3190 void *rx_handler_data)
3194 if (dev->rx_handler)
3197 /* Note: rx_handler_data must be set before rx_handler */
3198 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3199 rcu_assign_pointer(dev->rx_handler, rx_handler);
3203 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3206 * netdev_rx_handler_unregister - unregister receive handler
3207 * @dev: device to unregister a handler from
3209 * Unregister a receive hander from a device.
3211 * The caller must hold the rtnl_mutex.
3213 void netdev_rx_handler_unregister(struct net_device *dev)
3217 RCU_INIT_POINTER(dev->rx_handler, NULL);
3218 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3219 * section has a guarantee to see a non NULL rx_handler_data
3223 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3225 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3227 static int __netif_receive_skb(struct sk_buff *skb)
3229 struct packet_type *ptype, *pt_prev;
3230 rx_handler_func_t *rx_handler;
3231 struct net_device *orig_dev;
3232 struct net_device *null_or_dev;
3233 bool deliver_exact = false;
3234 int ret = NET_RX_DROP;
3237 if (!netdev_tstamp_prequeue)
3238 net_timestamp_check(skb);
3240 trace_netif_receive_skb(skb);
3242 /* if we've gotten here through NAPI, check netpoll */
3243 if (netpoll_receive_skb(skb))
3247 skb->skb_iif = skb->dev->ifindex;
3248 orig_dev = skb->dev;
3250 skb_reset_network_header(skb);
3251 skb_reset_transport_header(skb);
3252 skb_reset_mac_len(skb);
3260 __this_cpu_inc(softnet_data.processed);
3262 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3263 skb = vlan_untag(skb);
3268 #ifdef CONFIG_NET_CLS_ACT
3269 if (skb->tc_verd & TC_NCLS) {
3270 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3275 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3276 if (!ptype->dev || ptype->dev == skb->dev) {
3278 ret = deliver_skb(skb, pt_prev, orig_dev);
3283 #ifdef CONFIG_NET_CLS_ACT
3284 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3290 if (vlan_tx_tag_present(skb)) {
3292 ret = deliver_skb(skb, pt_prev, orig_dev);
3295 if (vlan_do_receive(&skb))
3297 else if (unlikely(!skb))
3301 rx_handler = rcu_dereference(skb->dev->rx_handler);
3304 ret = deliver_skb(skb, pt_prev, orig_dev);
3307 switch (rx_handler(&skb)) {
3308 case RX_HANDLER_CONSUMED:
3309 ret = NET_RX_SUCCESS;
3311 case RX_HANDLER_ANOTHER:
3313 case RX_HANDLER_EXACT:
3314 deliver_exact = true;
3315 case RX_HANDLER_PASS:
3322 if (vlan_tx_nonzero_tag_present(skb))
3323 skb->pkt_type = PACKET_OTHERHOST;
3325 /* deliver only exact match when indicated */
3326 null_or_dev = deliver_exact ? skb->dev : NULL;
3328 type = skb->protocol;
3329 list_for_each_entry_rcu(ptype,
3330 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3331 if (ptype->type == type &&
3332 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3333 ptype->dev == orig_dev)) {
3335 ret = deliver_skb(skb, pt_prev, orig_dev);
3341 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3343 atomic_long_inc(&skb->dev->rx_dropped);
3345 /* Jamal, now you will not able to escape explaining
3346 * me how you were going to use this. :-)
3357 * netif_receive_skb - process receive buffer from network
3358 * @skb: buffer to process
3360 * netif_receive_skb() is the main receive data processing function.
3361 * It always succeeds. The buffer may be dropped during processing
3362 * for congestion control or by the protocol layers.
3364 * This function may only be called from softirq context and interrupts
3365 * should be enabled.
3367 * Return values (usually ignored):
3368 * NET_RX_SUCCESS: no congestion
3369 * NET_RX_DROP: packet was dropped
3371 int netif_receive_skb(struct sk_buff *skb)
3373 if (netdev_tstamp_prequeue)
3374 net_timestamp_check(skb);
3376 if (skb_defer_rx_timestamp(skb))
3377 return NET_RX_SUCCESS;
3381 struct rps_dev_flow voidflow, *rflow = &voidflow;
3386 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3389 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3393 ret = __netif_receive_skb(skb);
3399 return __netif_receive_skb(skb);
3402 EXPORT_SYMBOL(netif_receive_skb);
3404 /* Network device is going away, flush any packets still pending
3405 * Called with irqs disabled.
3407 static void flush_backlog(void *arg)
3409 struct net_device *dev = arg;
3410 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3411 struct sk_buff *skb, *tmp;
3414 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3415 if (skb->dev == dev) {
3416 __skb_unlink(skb, &sd->input_pkt_queue);
3418 input_queue_head_incr(sd);
3423 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3424 if (skb->dev == dev) {
3425 __skb_unlink(skb, &sd->process_queue);
3427 input_queue_head_incr(sd);
3432 static int napi_gro_complete(struct sk_buff *skb)
3434 struct packet_type *ptype;
3435 __be16 type = skb->protocol;
3436 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3439 if (NAPI_GRO_CB(skb)->count == 1) {
3440 skb_shinfo(skb)->gso_size = 0;
3445 list_for_each_entry_rcu(ptype, head, list) {
3446 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3449 err = ptype->gro_complete(skb);
3455 WARN_ON(&ptype->list == head);
3457 return NET_RX_SUCCESS;
3461 return netif_receive_skb(skb);
3464 inline void napi_gro_flush(struct napi_struct *napi)
3466 struct sk_buff *skb, *next;
3468 for (skb = napi->gro_list; skb; skb = next) {
3471 napi_gro_complete(skb);
3474 napi->gro_count = 0;
3475 napi->gro_list = NULL;
3477 EXPORT_SYMBOL(napi_gro_flush);
3479 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3481 struct sk_buff **pp = NULL;
3482 struct packet_type *ptype;
3483 __be16 type = skb->protocol;
3484 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3487 enum gro_result ret;
3489 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3492 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3496 list_for_each_entry_rcu(ptype, head, list) {
3497 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3500 skb_set_network_header(skb, skb_gro_offset(skb));
3501 mac_len = skb->network_header - skb->mac_header;
3502 skb->mac_len = mac_len;
3503 NAPI_GRO_CB(skb)->same_flow = 0;
3504 NAPI_GRO_CB(skb)->flush = 0;
3505 NAPI_GRO_CB(skb)->free = 0;
3507 pp = ptype->gro_receive(&napi->gro_list, skb);
3512 if (&ptype->list == head)
3515 same_flow = NAPI_GRO_CB(skb)->same_flow;
3516 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3519 struct sk_buff *nskb = *pp;
3523 napi_gro_complete(nskb);
3530 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3534 NAPI_GRO_CB(skb)->count = 1;
3535 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3536 skb->next = napi->gro_list;
3537 napi->gro_list = skb;
3541 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3542 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3544 BUG_ON(skb->end - skb->tail < grow);
3546 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3549 skb->data_len -= grow;
3551 skb_shinfo(skb)->frags[0].page_offset += grow;
3552 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3554 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3555 skb_frag_unref(skb, 0);
3556 memmove(skb_shinfo(skb)->frags,
3557 skb_shinfo(skb)->frags + 1,
3558 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3569 EXPORT_SYMBOL(dev_gro_receive);
3571 static inline gro_result_t
3572 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3575 unsigned int maclen = skb->dev->hard_header_len;
3577 for (p = napi->gro_list; p; p = p->next) {
3578 unsigned long diffs;
3580 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3581 diffs |= p->vlan_tci ^ skb->vlan_tci;
3582 if (maclen == ETH_HLEN)
3583 diffs |= compare_ether_header(skb_mac_header(p),
3584 skb_gro_mac_header(skb));
3586 diffs = memcmp(skb_mac_header(p),
3587 skb_gro_mac_header(skb),
3589 NAPI_GRO_CB(p)->same_flow = !diffs;
3590 NAPI_GRO_CB(p)->flush = 0;
3593 return dev_gro_receive(napi, skb);
3596 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3600 if (netif_receive_skb(skb))
3605 case GRO_MERGED_FREE:
3616 EXPORT_SYMBOL(napi_skb_finish);
3618 void skb_gro_reset_offset(struct sk_buff *skb)
3620 NAPI_GRO_CB(skb)->data_offset = 0;
3621 NAPI_GRO_CB(skb)->frag0 = NULL;
3622 NAPI_GRO_CB(skb)->frag0_len = 0;
3624 if (skb->mac_header == skb->tail &&
3625 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3626 NAPI_GRO_CB(skb)->frag0 =
3627 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3628 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3631 EXPORT_SYMBOL(skb_gro_reset_offset);
3633 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3635 skb_gro_reset_offset(skb);
3637 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3639 EXPORT_SYMBOL(napi_gro_receive);
3641 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3643 __skb_pull(skb, skb_headlen(skb));
3644 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3645 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3647 skb->dev = napi->dev;
3653 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3655 struct sk_buff *skb = napi->skb;
3658 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3664 EXPORT_SYMBOL(napi_get_frags);
3666 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3672 skb->protocol = eth_type_trans(skb, skb->dev);
3674 if (ret == GRO_HELD)
3675 skb_gro_pull(skb, -ETH_HLEN);
3676 else if (netif_receive_skb(skb))
3681 case GRO_MERGED_FREE:
3682 napi_reuse_skb(napi, skb);
3691 EXPORT_SYMBOL(napi_frags_finish);
3693 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3695 struct sk_buff *skb = napi->skb;
3702 skb_reset_mac_header(skb);
3703 skb_gro_reset_offset(skb);
3705 off = skb_gro_offset(skb);
3706 hlen = off + sizeof(*eth);
3707 eth = skb_gro_header_fast(skb, off);
3708 if (skb_gro_header_hard(skb, hlen)) {
3709 eth = skb_gro_header_slow(skb, hlen, off);
3710 if (unlikely(!eth)) {
3711 napi_reuse_skb(napi, skb);
3717 skb_gro_pull(skb, sizeof(*eth));
3720 * This works because the only protocols we care about don't require
3721 * special handling. We'll fix it up properly at the end.
3723 skb->protocol = eth->h_proto;
3728 EXPORT_SYMBOL(napi_frags_skb);
3730 gro_result_t napi_gro_frags(struct napi_struct *napi)
3732 struct sk_buff *skb = napi_frags_skb(napi);
3737 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3739 EXPORT_SYMBOL(napi_gro_frags);
3742 * net_rps_action sends any pending IPI's for rps.
3743 * Note: called with local irq disabled, but exits with local irq enabled.
3745 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3748 struct softnet_data *remsd = sd->rps_ipi_list;
3751 sd->rps_ipi_list = NULL;
3755 /* Send pending IPI's to kick RPS processing on remote cpus. */
3757 struct softnet_data *next = remsd->rps_ipi_next;
3759 if (cpu_online(remsd->cpu))
3760 __smp_call_function_single(remsd->cpu,
3769 static int process_backlog(struct napi_struct *napi, int quota)
3772 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3775 /* Check if we have pending ipi, its better to send them now,
3776 * not waiting net_rx_action() end.
3778 if (sd->rps_ipi_list) {
3779 local_irq_disable();
3780 net_rps_action_and_irq_enable(sd);
3783 napi->weight = weight_p;
3784 local_irq_disable();
3785 while (work < quota) {
3786 struct sk_buff *skb;
3789 while ((skb = __skb_dequeue(&sd->process_queue))) {
3791 __netif_receive_skb(skb);
3792 local_irq_disable();
3793 input_queue_head_incr(sd);
3794 if (++work >= quota) {
3801 qlen = skb_queue_len(&sd->input_pkt_queue);
3803 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3804 &sd->process_queue);
3806 if (qlen < quota - work) {
3808 * Inline a custom version of __napi_complete().
3809 * only current cpu owns and manipulates this napi,
3810 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3811 * we can use a plain write instead of clear_bit(),
3812 * and we dont need an smp_mb() memory barrier.
3814 list_del(&napi->poll_list);
3817 quota = work + qlen;
3827 * __napi_schedule - schedule for receive
3828 * @n: entry to schedule
3830 * The entry's receive function will be scheduled to run
3832 void __napi_schedule(struct napi_struct *n)
3834 unsigned long flags;
3836 local_irq_save(flags);
3837 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3838 local_irq_restore(flags);
3840 EXPORT_SYMBOL(__napi_schedule);
3842 void __napi_complete(struct napi_struct *n)
3844 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3845 BUG_ON(n->gro_list);
3847 list_del(&n->poll_list);
3848 smp_mb__before_clear_bit();
3849 clear_bit(NAPI_STATE_SCHED, &n->state);
3851 EXPORT_SYMBOL(__napi_complete);
3853 void napi_complete(struct napi_struct *n)
3855 unsigned long flags;
3858 * don't let napi dequeue from the cpu poll list
3859 * just in case its running on a different cpu
3861 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3865 local_irq_save(flags);
3867 local_irq_restore(flags);
3869 EXPORT_SYMBOL(napi_complete);
3871 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3872 int (*poll)(struct napi_struct *, int), int weight)
3874 INIT_LIST_HEAD(&napi->poll_list);
3875 napi->gro_count = 0;
3876 napi->gro_list = NULL;
3879 napi->weight = weight;
3880 list_add(&napi->dev_list, &dev->napi_list);
3882 #ifdef CONFIG_NETPOLL
3883 spin_lock_init(&napi->poll_lock);
3884 napi->poll_owner = -1;
3886 set_bit(NAPI_STATE_SCHED, &napi->state);
3888 EXPORT_SYMBOL(netif_napi_add);
3890 void netif_napi_del(struct napi_struct *napi)
3892 struct sk_buff *skb, *next;
3894 list_del_init(&napi->dev_list);
3895 napi_free_frags(napi);
3897 for (skb = napi->gro_list; skb; skb = next) {
3903 napi->gro_list = NULL;
3904 napi->gro_count = 0;
3906 EXPORT_SYMBOL(netif_napi_del);
3908 static void net_rx_action(struct softirq_action *h)
3910 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3911 unsigned long time_limit = jiffies + 2;
3912 int budget = netdev_budget;
3915 local_irq_disable();
3917 while (!list_empty(&sd->poll_list)) {
3918 struct napi_struct *n;
3921 /* If softirq window is exhuasted then punt.
3922 * Allow this to run for 2 jiffies since which will allow
3923 * an average latency of 1.5/HZ.
3925 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3930 /* Even though interrupts have been re-enabled, this
3931 * access is safe because interrupts can only add new
3932 * entries to the tail of this list, and only ->poll()
3933 * calls can remove this head entry from the list.
3935 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3937 have = netpoll_poll_lock(n);
3941 /* This NAPI_STATE_SCHED test is for avoiding a race
3942 * with netpoll's poll_napi(). Only the entity which
3943 * obtains the lock and sees NAPI_STATE_SCHED set will
3944 * actually make the ->poll() call. Therefore we avoid
3945 * accidentally calling ->poll() when NAPI is not scheduled.
3948 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3949 work = n->poll(n, weight);
3953 WARN_ON_ONCE(work > weight);
3957 local_irq_disable();
3959 /* Drivers must not modify the NAPI state if they
3960 * consume the entire weight. In such cases this code
3961 * still "owns" the NAPI instance and therefore can
3962 * move the instance around on the list at-will.
3964 if (unlikely(work == weight)) {
3965 if (unlikely(napi_disable_pending(n))) {
3968 local_irq_disable();
3970 list_move_tail(&n->poll_list, &sd->poll_list);
3973 netpoll_poll_unlock(have);
3976 net_rps_action_and_irq_enable(sd);
3978 #ifdef CONFIG_NET_DMA
3980 * There may not be any more sk_buffs coming right now, so push
3981 * any pending DMA copies to hardware
3983 dma_issue_pending_all();
3990 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3994 static gifconf_func_t *gifconf_list[NPROTO];
3997 * register_gifconf - register a SIOCGIF handler
3998 * @family: Address family
3999 * @gifconf: Function handler
4001 * Register protocol dependent address dumping routines. The handler
4002 * that is passed must not be freed or reused until it has been replaced
4003 * by another handler.
4005 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
4007 if (family >= NPROTO)
4009 gifconf_list[family] = gifconf;
4012 EXPORT_SYMBOL(register_gifconf);
4016 * Map an interface index to its name (SIOCGIFNAME)
4020 * We need this ioctl for efficient implementation of the
4021 * if_indextoname() function required by the IPv6 API. Without
4022 * it, we would have to search all the interfaces to find a
4026 static int dev_ifname(struct net *net, struct ifreq __user *arg)
4028 struct net_device *dev;
4032 * Fetch the caller's info block.
4035 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4039 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4045 strcpy(ifr.ifr_name, dev->name);
4048 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4054 * Perform a SIOCGIFCONF call. This structure will change
4055 * size eventually, and there is nothing I can do about it.
4056 * Thus we will need a 'compatibility mode'.
4059 static int dev_ifconf(struct net *net, char __user *arg)
4062 struct net_device *dev;
4069 * Fetch the caller's info block.
4072 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4079 * Loop over the interfaces, and write an info block for each.
4083 for_each_netdev(net, dev) {
4084 for (i = 0; i < NPROTO; i++) {
4085 if (gifconf_list[i]) {
4088 done = gifconf_list[i](dev, NULL, 0);
4090 done = gifconf_list[i](dev, pos + total,
4100 * All done. Write the updated control block back to the caller.
4102 ifc.ifc_len = total;
4105 * Both BSD and Solaris return 0 here, so we do too.
4107 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4110 #ifdef CONFIG_PROC_FS
4112 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4114 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4115 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4116 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4118 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4120 struct net *net = seq_file_net(seq);
4121 struct net_device *dev;
4122 struct hlist_node *p;
4123 struct hlist_head *h;
4124 unsigned int count = 0, offset = get_offset(*pos);
4126 h = &net->dev_name_head[get_bucket(*pos)];
4127 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4128 if (++count == offset)
4135 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4137 struct net_device *dev;
4138 unsigned int bucket;
4141 dev = dev_from_same_bucket(seq, pos);
4145 bucket = get_bucket(*pos) + 1;
4146 *pos = set_bucket_offset(bucket, 1);
4147 } while (bucket < NETDEV_HASHENTRIES);
4153 * This is invoked by the /proc filesystem handler to display a device
4156 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4161 return SEQ_START_TOKEN;
4163 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4166 return dev_from_bucket(seq, pos);
4169 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4172 return dev_from_bucket(seq, pos);
4175 void dev_seq_stop(struct seq_file *seq, void *v)
4181 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4183 struct rtnl_link_stats64 temp;
4184 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4186 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4187 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4188 dev->name, stats->rx_bytes, stats->rx_packets,
4190 stats->rx_dropped + stats->rx_missed_errors,
4191 stats->rx_fifo_errors,
4192 stats->rx_length_errors + stats->rx_over_errors +
4193 stats->rx_crc_errors + stats->rx_frame_errors,
4194 stats->rx_compressed, stats->multicast,
4195 stats->tx_bytes, stats->tx_packets,
4196 stats->tx_errors, stats->tx_dropped,
4197 stats->tx_fifo_errors, stats->collisions,
4198 stats->tx_carrier_errors +
4199 stats->tx_aborted_errors +
4200 stats->tx_window_errors +
4201 stats->tx_heartbeat_errors,
4202 stats->tx_compressed);
4206 * Called from the PROCfs module. This now uses the new arbitrary sized
4207 * /proc/net interface to create /proc/net/dev
4209 static int dev_seq_show(struct seq_file *seq, void *v)
4211 if (v == SEQ_START_TOKEN)
4212 seq_puts(seq, "Inter-| Receive "
4214 " face |bytes packets errs drop fifo frame "
4215 "compressed multicast|bytes packets errs "
4216 "drop fifo colls carrier compressed\n");
4218 dev_seq_printf_stats(seq, v);
4222 static struct softnet_data *softnet_get_online(loff_t *pos)
4224 struct softnet_data *sd = NULL;
4226 while (*pos < nr_cpu_ids)
4227 if (cpu_online(*pos)) {
4228 sd = &per_cpu(softnet_data, *pos);
4235 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4237 return softnet_get_online(pos);
4240 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4243 return softnet_get_online(pos);
4246 static void softnet_seq_stop(struct seq_file *seq, void *v)
4250 static int softnet_seq_show(struct seq_file *seq, void *v)
4252 struct softnet_data *sd = v;
4254 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4255 sd->processed, sd->dropped, sd->time_squeeze, 0,
4256 0, 0, 0, 0, /* was fastroute */
4257 sd->cpu_collision, sd->received_rps);
4261 static const struct seq_operations dev_seq_ops = {
4262 .start = dev_seq_start,
4263 .next = dev_seq_next,
4264 .stop = dev_seq_stop,
4265 .show = dev_seq_show,
4268 static int dev_seq_open(struct inode *inode, struct file *file)
4270 return seq_open_net(inode, file, &dev_seq_ops,
4271 sizeof(struct seq_net_private));
4274 static const struct file_operations dev_seq_fops = {
4275 .owner = THIS_MODULE,
4276 .open = dev_seq_open,
4278 .llseek = seq_lseek,
4279 .release = seq_release_net,
4282 static const struct seq_operations softnet_seq_ops = {
4283 .start = softnet_seq_start,
4284 .next = softnet_seq_next,
4285 .stop = softnet_seq_stop,
4286 .show = softnet_seq_show,
4289 static int softnet_seq_open(struct inode *inode, struct file *file)
4291 return seq_open(file, &softnet_seq_ops);
4294 static const struct file_operations softnet_seq_fops = {
4295 .owner = THIS_MODULE,
4296 .open = softnet_seq_open,
4298 .llseek = seq_lseek,
4299 .release = seq_release,
4302 static void *ptype_get_idx(loff_t pos)
4304 struct packet_type *pt = NULL;
4308 list_for_each_entry_rcu(pt, &ptype_all, list) {
4314 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4315 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4324 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4328 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4331 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4333 struct packet_type *pt;
4334 struct list_head *nxt;
4338 if (v == SEQ_START_TOKEN)
4339 return ptype_get_idx(0);
4342 nxt = pt->list.next;
4343 if (pt->type == htons(ETH_P_ALL)) {
4344 if (nxt != &ptype_all)
4347 nxt = ptype_base[0].next;
4349 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4351 while (nxt == &ptype_base[hash]) {
4352 if (++hash >= PTYPE_HASH_SIZE)
4354 nxt = ptype_base[hash].next;
4357 return list_entry(nxt, struct packet_type, list);
4360 static void ptype_seq_stop(struct seq_file *seq, void *v)
4366 static int ptype_seq_show(struct seq_file *seq, void *v)
4368 struct packet_type *pt = v;
4370 if (v == SEQ_START_TOKEN)
4371 seq_puts(seq, "Type Device Function\n");
4372 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4373 if (pt->type == htons(ETH_P_ALL))
4374 seq_puts(seq, "ALL ");
4376 seq_printf(seq, "%04x", ntohs(pt->type));
4378 seq_printf(seq, " %-8s %pF\n",
4379 pt->dev ? pt->dev->name : "", pt->func);
4385 static const struct seq_operations ptype_seq_ops = {
4386 .start = ptype_seq_start,
4387 .next = ptype_seq_next,
4388 .stop = ptype_seq_stop,
4389 .show = ptype_seq_show,
4392 static int ptype_seq_open(struct inode *inode, struct file *file)
4394 return seq_open_net(inode, file, &ptype_seq_ops,
4395 sizeof(struct seq_net_private));
4398 static const struct file_operations ptype_seq_fops = {
4399 .owner = THIS_MODULE,
4400 .open = ptype_seq_open,
4402 .llseek = seq_lseek,
4403 .release = seq_release_net,
4407 static int __net_init dev_proc_net_init(struct net *net)
4411 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4413 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4415 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4418 if (wext_proc_init(net))
4424 proc_net_remove(net, "ptype");
4426 proc_net_remove(net, "softnet_stat");
4428 proc_net_remove(net, "dev");
4432 static void __net_exit dev_proc_net_exit(struct net *net)
4434 wext_proc_exit(net);
4436 proc_net_remove(net, "ptype");
4437 proc_net_remove(net, "softnet_stat");
4438 proc_net_remove(net, "dev");
4441 static struct pernet_operations __net_initdata dev_proc_ops = {
4442 .init = dev_proc_net_init,
4443 .exit = dev_proc_net_exit,
4446 static int __init dev_proc_init(void)
4448 return register_pernet_subsys(&dev_proc_ops);
4451 #define dev_proc_init() 0
4452 #endif /* CONFIG_PROC_FS */
4456 * netdev_set_master - set up master pointer
4457 * @slave: slave device
4458 * @master: new master device
4460 * Changes the master device of the slave. Pass %NULL to break the
4461 * bonding. The caller must hold the RTNL semaphore. On a failure
4462 * a negative errno code is returned. On success the reference counts
4463 * are adjusted and the function returns zero.
4465 int netdev_set_master(struct net_device *slave, struct net_device *master)
4467 struct net_device *old = slave->master;
4477 slave->master = master;
4483 EXPORT_SYMBOL(netdev_set_master);
4486 * netdev_set_bond_master - set up bonding master/slave pair
4487 * @slave: slave device
4488 * @master: new master device
4490 * Changes the master device of the slave. Pass %NULL to break the
4491 * bonding. The caller must hold the RTNL semaphore. On a failure
4492 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4493 * to the routing socket and the function returns zero.
4495 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4501 err = netdev_set_master(slave, master);
4505 slave->flags |= IFF_SLAVE;
4507 slave->flags &= ~IFF_SLAVE;
4509 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4512 EXPORT_SYMBOL(netdev_set_bond_master);
4514 static void dev_change_rx_flags(struct net_device *dev, int flags)
4516 const struct net_device_ops *ops = dev->netdev_ops;
4518 if (ops->ndo_change_rx_flags)
4519 ops->ndo_change_rx_flags(dev, flags);
4522 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4524 unsigned short old_flags = dev->flags;
4530 dev->flags |= IFF_PROMISC;
4531 dev->promiscuity += inc;
4532 if (dev->promiscuity == 0) {
4535 * If inc causes overflow, untouch promisc and return error.
4538 dev->flags &= ~IFF_PROMISC;
4540 dev->promiscuity -= inc;
4541 printk(KERN_WARNING "%s: promiscuity touches roof, "
4542 "set promiscuity failed, promiscuity feature "
4543 "of device might be broken.\n", dev->name);
4547 if (dev->flags != old_flags) {
4548 printk(KERN_INFO "device %s %s promiscuous mode\n",
4549 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4551 if (audit_enabled) {
4552 current_uid_gid(&uid, &gid);
4553 audit_log(current->audit_context, GFP_ATOMIC,
4554 AUDIT_ANOM_PROMISCUOUS,
4555 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4556 dev->name, (dev->flags & IFF_PROMISC),
4557 (old_flags & IFF_PROMISC),
4558 audit_get_loginuid(current),
4560 audit_get_sessionid(current));
4563 dev_change_rx_flags(dev, IFF_PROMISC);
4569 * dev_set_promiscuity - update promiscuity count on a device
4573 * Add or remove promiscuity from a device. While the count in the device
4574 * remains above zero the interface remains promiscuous. Once it hits zero
4575 * the device reverts back to normal filtering operation. A negative inc
4576 * value is used to drop promiscuity on the device.
4577 * Return 0 if successful or a negative errno code on error.
4579 int dev_set_promiscuity(struct net_device *dev, int inc)
4581 unsigned short old_flags = dev->flags;
4584 err = __dev_set_promiscuity(dev, inc);
4587 if (dev->flags != old_flags)
4588 dev_set_rx_mode(dev);
4591 EXPORT_SYMBOL(dev_set_promiscuity);
4594 * dev_set_allmulti - update allmulti count on a device
4598 * Add or remove reception of all multicast frames to a device. While the
4599 * count in the device remains above zero the interface remains listening
4600 * to all interfaces. Once it hits zero the device reverts back to normal
4601 * filtering operation. A negative @inc value is used to drop the counter
4602 * when releasing a resource needing all multicasts.
4603 * Return 0 if successful or a negative errno code on error.
4606 int dev_set_allmulti(struct net_device *dev, int inc)
4608 unsigned short old_flags = dev->flags;
4612 dev->flags |= IFF_ALLMULTI;
4613 dev->allmulti += inc;
4614 if (dev->allmulti == 0) {
4617 * If inc causes overflow, untouch allmulti and return error.
4620 dev->flags &= ~IFF_ALLMULTI;
4622 dev->allmulti -= inc;
4623 printk(KERN_WARNING "%s: allmulti touches roof, "
4624 "set allmulti failed, allmulti feature of "
4625 "device might be broken.\n", dev->name);
4629 if (dev->flags ^ old_flags) {
4630 dev_change_rx_flags(dev, IFF_ALLMULTI);
4631 dev_set_rx_mode(dev);
4635 EXPORT_SYMBOL(dev_set_allmulti);
4638 * Upload unicast and multicast address lists to device and
4639 * configure RX filtering. When the device doesn't support unicast
4640 * filtering it is put in promiscuous mode while unicast addresses
4643 void __dev_set_rx_mode(struct net_device *dev)
4645 const struct net_device_ops *ops = dev->netdev_ops;
4647 /* dev_open will call this function so the list will stay sane. */
4648 if (!(dev->flags&IFF_UP))
4651 if (!netif_device_present(dev))
4654 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4655 /* Unicast addresses changes may only happen under the rtnl,
4656 * therefore calling __dev_set_promiscuity here is safe.
4658 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4659 __dev_set_promiscuity(dev, 1);
4660 dev->uc_promisc = true;
4661 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4662 __dev_set_promiscuity(dev, -1);
4663 dev->uc_promisc = false;
4667 if (ops->ndo_set_rx_mode)
4668 ops->ndo_set_rx_mode(dev);
4671 void dev_set_rx_mode(struct net_device *dev)
4673 netif_addr_lock_bh(dev);
4674 __dev_set_rx_mode(dev);
4675 netif_addr_unlock_bh(dev);
4679 * dev_get_flags - get flags reported to userspace
4682 * Get the combination of flag bits exported through APIs to userspace.
4684 unsigned dev_get_flags(const struct net_device *dev)
4688 flags = (dev->flags & ~(IFF_PROMISC |
4693 (dev->gflags & (IFF_PROMISC |
4696 if (netif_running(dev)) {
4697 if (netif_oper_up(dev))
4698 flags |= IFF_RUNNING;
4699 if (netif_carrier_ok(dev))
4700 flags |= IFF_LOWER_UP;
4701 if (netif_dormant(dev))
4702 flags |= IFF_DORMANT;
4707 EXPORT_SYMBOL(dev_get_flags);
4709 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4711 int old_flags = dev->flags;
4717 * Set the flags on our device.
4720 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4721 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4723 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4727 * Load in the correct multicast list now the flags have changed.
4730 if ((old_flags ^ flags) & IFF_MULTICAST)
4731 dev_change_rx_flags(dev, IFF_MULTICAST);
4733 dev_set_rx_mode(dev);
4736 * Have we downed the interface. We handle IFF_UP ourselves
4737 * according to user attempts to set it, rather than blindly
4742 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4743 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4746 dev_set_rx_mode(dev);
4749 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4750 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4752 dev->gflags ^= IFF_PROMISC;
4753 dev_set_promiscuity(dev, inc);
4756 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4757 is important. Some (broken) drivers set IFF_PROMISC, when
4758 IFF_ALLMULTI is requested not asking us and not reporting.
4760 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4761 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4763 dev->gflags ^= IFF_ALLMULTI;
4764 dev_set_allmulti(dev, inc);
4770 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4772 unsigned int changes = dev->flags ^ old_flags;
4774 if (changes & IFF_UP) {
4775 if (dev->flags & IFF_UP)
4776 call_netdevice_notifiers(NETDEV_UP, dev);
4778 call_netdevice_notifiers(NETDEV_DOWN, dev);
4781 if (dev->flags & IFF_UP &&
4782 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4783 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4787 * dev_change_flags - change device settings
4789 * @flags: device state flags
4791 * Change settings on device based state flags. The flags are
4792 * in the userspace exported format.
4794 int dev_change_flags(struct net_device *dev, unsigned flags)
4797 int old_flags = dev->flags;
4799 ret = __dev_change_flags(dev, flags);
4803 changes = old_flags ^ dev->flags;
4805 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4807 __dev_notify_flags(dev, old_flags);
4810 EXPORT_SYMBOL(dev_change_flags);
4813 * dev_set_mtu - Change maximum transfer unit
4815 * @new_mtu: new transfer unit
4817 * Change the maximum transfer size of the network device.
4819 int dev_set_mtu(struct net_device *dev, int new_mtu)
4821 const struct net_device_ops *ops = dev->netdev_ops;
4824 if (new_mtu == dev->mtu)
4827 /* MTU must be positive. */
4831 if (!netif_device_present(dev))
4835 if (ops->ndo_change_mtu)
4836 err = ops->ndo_change_mtu(dev, new_mtu);
4840 if (!err && dev->flags & IFF_UP)
4841 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4844 EXPORT_SYMBOL(dev_set_mtu);
4847 * dev_set_group - Change group this device belongs to
4849 * @new_group: group this device should belong to
4851 void dev_set_group(struct net_device *dev, int new_group)
4853 dev->group = new_group;
4855 EXPORT_SYMBOL(dev_set_group);
4858 * dev_set_mac_address - Change Media Access Control Address
4862 * Change the hardware (MAC) address of the device
4864 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4866 const struct net_device_ops *ops = dev->netdev_ops;
4869 if (!ops->ndo_set_mac_address)
4871 if (sa->sa_family != dev->type)
4873 if (!netif_device_present(dev))
4875 err = ops->ndo_set_mac_address(dev, sa);
4877 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4878 add_device_randomness(dev->dev_addr, dev->addr_len);
4881 EXPORT_SYMBOL(dev_set_mac_address);
4884 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4886 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4889 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4895 case SIOCGIFFLAGS: /* Get interface flags */
4896 ifr->ifr_flags = (short) dev_get_flags(dev);
4899 case SIOCGIFMETRIC: /* Get the metric on the interface
4900 (currently unused) */
4901 ifr->ifr_metric = 0;
4904 case SIOCGIFMTU: /* Get the MTU of a device */
4905 ifr->ifr_mtu = dev->mtu;
4910 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4912 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4913 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4914 ifr->ifr_hwaddr.sa_family = dev->type;
4922 ifr->ifr_map.mem_start = dev->mem_start;
4923 ifr->ifr_map.mem_end = dev->mem_end;
4924 ifr->ifr_map.base_addr = dev->base_addr;
4925 ifr->ifr_map.irq = dev->irq;
4926 ifr->ifr_map.dma = dev->dma;
4927 ifr->ifr_map.port = dev->if_port;
4931 ifr->ifr_ifindex = dev->ifindex;
4935 ifr->ifr_qlen = dev->tx_queue_len;
4939 /* dev_ioctl() should ensure this case
4951 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4953 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4956 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4957 const struct net_device_ops *ops;
4962 ops = dev->netdev_ops;
4965 case SIOCSIFFLAGS: /* Set interface flags */
4966 return dev_change_flags(dev, ifr->ifr_flags);
4968 case SIOCSIFMETRIC: /* Set the metric on the interface
4969 (currently unused) */
4972 case SIOCSIFMTU: /* Set the MTU of a device */
4973 return dev_set_mtu(dev, ifr->ifr_mtu);
4976 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4978 case SIOCSIFHWBROADCAST:
4979 if (ifr->ifr_hwaddr.sa_family != dev->type)
4981 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4982 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4983 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4987 if (ops->ndo_set_config) {
4988 if (!netif_device_present(dev))
4990 return ops->ndo_set_config(dev, &ifr->ifr_map);
4995 if (!ops->ndo_set_rx_mode ||
4996 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4998 if (!netif_device_present(dev))
5000 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
5003 if (!ops->ndo_set_rx_mode ||
5004 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5006 if (!netif_device_present(dev))
5008 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
5011 if (ifr->ifr_qlen < 0)
5013 dev->tx_queue_len = ifr->ifr_qlen;
5017 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
5018 return dev_change_name(dev, ifr->ifr_newname);
5021 err = net_hwtstamp_validate(ifr);
5027 * Unknown or private ioctl
5030 if ((cmd >= SIOCDEVPRIVATE &&
5031 cmd <= SIOCDEVPRIVATE + 15) ||
5032 cmd == SIOCBONDENSLAVE ||
5033 cmd == SIOCBONDRELEASE ||
5034 cmd == SIOCBONDSETHWADDR ||
5035 cmd == SIOCBONDSLAVEINFOQUERY ||
5036 cmd == SIOCBONDINFOQUERY ||
5037 cmd == SIOCBONDCHANGEACTIVE ||
5038 cmd == SIOCGMIIPHY ||
5039 cmd == SIOCGMIIREG ||
5040 cmd == SIOCSMIIREG ||
5041 cmd == SIOCBRADDIF ||
5042 cmd == SIOCBRDELIF ||
5043 cmd == SIOCSHWTSTAMP ||
5044 cmd == SIOCWANDEV) {
5046 if (ops->ndo_do_ioctl) {
5047 if (netif_device_present(dev))
5048 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5060 * This function handles all "interface"-type I/O control requests. The actual
5061 * 'doing' part of this is dev_ifsioc above.
5065 * dev_ioctl - network device ioctl
5066 * @net: the applicable net namespace
5067 * @cmd: command to issue
5068 * @arg: pointer to a struct ifreq in user space
5070 * Issue ioctl functions to devices. This is normally called by the
5071 * user space syscall interfaces but can sometimes be useful for
5072 * other purposes. The return value is the return from the syscall if
5073 * positive or a negative errno code on error.
5076 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5082 /* One special case: SIOCGIFCONF takes ifconf argument
5083 and requires shared lock, because it sleeps writing
5087 if (cmd == SIOCGIFCONF) {
5089 ret = dev_ifconf(net, (char __user *) arg);
5093 if (cmd == SIOCGIFNAME)
5094 return dev_ifname(net, (struct ifreq __user *)arg);
5096 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5099 ifr.ifr_name[IFNAMSIZ-1] = 0;
5101 colon = strchr(ifr.ifr_name, ':');
5106 * See which interface the caller is talking about.
5111 * These ioctl calls:
5112 * - can be done by all.
5113 * - atomic and do not require locking.
5124 dev_load(net, ifr.ifr_name);
5126 ret = dev_ifsioc_locked(net, &ifr, cmd);
5131 if (copy_to_user(arg, &ifr,
5132 sizeof(struct ifreq)))
5138 dev_load(net, ifr.ifr_name);
5140 ret = dev_ethtool(net, &ifr);
5145 if (copy_to_user(arg, &ifr,
5146 sizeof(struct ifreq)))
5152 * These ioctl calls:
5153 * - require superuser power.
5154 * - require strict serialization.
5160 if (!capable(CAP_NET_ADMIN))
5162 dev_load(net, ifr.ifr_name);
5164 ret = dev_ifsioc(net, &ifr, cmd);
5169 if (copy_to_user(arg, &ifr,
5170 sizeof(struct ifreq)))
5176 * These ioctl calls:
5177 * - require superuser power.
5178 * - require strict serialization.
5179 * - do not return a value
5189 case SIOCSIFHWBROADCAST:
5192 case SIOCBONDENSLAVE:
5193 case SIOCBONDRELEASE:
5194 case SIOCBONDSETHWADDR:
5195 case SIOCBONDCHANGEACTIVE:
5199 if (!capable(CAP_NET_ADMIN))
5202 case SIOCBONDSLAVEINFOQUERY:
5203 case SIOCBONDINFOQUERY:
5204 dev_load(net, ifr.ifr_name);
5206 ret = dev_ifsioc(net, &ifr, cmd);
5211 /* Get the per device memory space. We can add this but
5212 * currently do not support it */
5214 /* Set the per device memory buffer space.
5215 * Not applicable in our case */
5220 * Unknown or private ioctl.
5223 if (cmd == SIOCWANDEV ||
5224 (cmd >= SIOCDEVPRIVATE &&
5225 cmd <= SIOCDEVPRIVATE + 15)) {
5226 dev_load(net, ifr.ifr_name);
5228 ret = dev_ifsioc(net, &ifr, cmd);
5230 if (!ret && copy_to_user(arg, &ifr,
5231 sizeof(struct ifreq)))
5235 /* Take care of Wireless Extensions */
5236 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5237 return wext_handle_ioctl(net, &ifr, cmd, arg);
5244 * dev_new_index - allocate an ifindex
5245 * @net: the applicable net namespace
5247 * Returns a suitable unique value for a new device interface
5248 * number. The caller must hold the rtnl semaphore or the
5249 * dev_base_lock to be sure it remains unique.
5251 static int dev_new_index(struct net *net)
5257 if (!__dev_get_by_index(net, ifindex))
5262 /* Delayed registration/unregisteration */
5263 static LIST_HEAD(net_todo_list);
5265 static void net_set_todo(struct net_device *dev)
5267 list_add_tail(&dev->todo_list, &net_todo_list);
5270 static void rollback_registered_many(struct list_head *head)
5272 struct net_device *dev, *tmp;
5274 BUG_ON(dev_boot_phase);
5277 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5278 /* Some devices call without registering
5279 * for initialization unwind. Remove those
5280 * devices and proceed with the remaining.
5282 if (dev->reg_state == NETREG_UNINITIALIZED) {
5283 pr_debug("unregister_netdevice: device %s/%p never "
5284 "was registered\n", dev->name, dev);
5287 list_del(&dev->unreg_list);
5290 dev->dismantle = true;
5291 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5294 /* If device is running, close it first. */
5295 dev_close_many(head);
5297 list_for_each_entry(dev, head, unreg_list) {
5298 /* And unlink it from device chain. */
5299 unlist_netdevice(dev);
5301 dev->reg_state = NETREG_UNREGISTERING;
5306 list_for_each_entry(dev, head, unreg_list) {
5307 /* Shutdown queueing discipline. */
5311 /* Notify protocols, that we are about to destroy
5312 this device. They should clean all the things.
5314 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5316 if (!dev->rtnl_link_ops ||
5317 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5318 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5321 * Flush the unicast and multicast chains
5326 if (dev->netdev_ops->ndo_uninit)
5327 dev->netdev_ops->ndo_uninit(dev);
5329 /* Notifier chain MUST detach us from master device. */
5330 WARN_ON(dev->master);
5332 /* Remove entries from kobject tree */
5333 netdev_unregister_kobject(dev);
5336 /* Process any work delayed until the end of the batch */
5337 dev = list_first_entry(head, struct net_device, unreg_list);
5338 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5342 list_for_each_entry(dev, head, unreg_list)
5346 static void rollback_registered(struct net_device *dev)
5350 list_add(&dev->unreg_list, &single);
5351 rollback_registered_many(&single);
5355 static u32 netdev_fix_features(struct net_device *dev, u32 features)
5357 /* Fix illegal checksum combinations */
5358 if ((features & NETIF_F_HW_CSUM) &&
5359 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5360 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5361 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5364 if ((features & NETIF_F_NO_CSUM) &&
5365 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5366 netdev_warn(dev, "mixed no checksumming and other settings.\n");
5367 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5370 /* Fix illegal SG+CSUM combinations. */
5371 if ((features & NETIF_F_SG) &&
5372 !(features & NETIF_F_ALL_CSUM)) {
5374 "Dropping NETIF_F_SG since no checksum feature.\n");
5375 features &= ~NETIF_F_SG;
5378 /* TSO requires that SG is present as well. */
5379 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5380 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5381 features &= ~NETIF_F_ALL_TSO;
5384 /* TSO ECN requires that TSO is present as well. */
5385 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5386 features &= ~NETIF_F_TSO_ECN;
5388 /* Software GSO depends on SG. */
5389 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5390 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5391 features &= ~NETIF_F_GSO;
5394 /* UFO needs SG and checksumming */
5395 if (features & NETIF_F_UFO) {
5396 /* maybe split UFO into V4 and V6? */
5397 if (!((features & NETIF_F_GEN_CSUM) ||
5398 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5399 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5401 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5402 features &= ~NETIF_F_UFO;
5405 if (!(features & NETIF_F_SG)) {
5407 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5408 features &= ~NETIF_F_UFO;
5415 int __netdev_update_features(struct net_device *dev)
5422 features = netdev_get_wanted_features(dev);
5424 if (dev->netdev_ops->ndo_fix_features)
5425 features = dev->netdev_ops->ndo_fix_features(dev, features);
5427 /* driver might be less strict about feature dependencies */
5428 features = netdev_fix_features(dev, features);
5430 if (dev->features == features)
5433 netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n",
5434 dev->features, features);
5436 if (dev->netdev_ops->ndo_set_features)
5437 err = dev->netdev_ops->ndo_set_features(dev, features);
5439 if (unlikely(err < 0)) {
5441 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5442 err, features, dev->features);
5447 dev->features = features;
5453 * netdev_update_features - recalculate device features
5454 * @dev: the device to check
5456 * Recalculate dev->features set and send notifications if it
5457 * has changed. Should be called after driver or hardware dependent
5458 * conditions might have changed that influence the features.
5460 void netdev_update_features(struct net_device *dev)
5462 if (__netdev_update_features(dev))
5463 netdev_features_change(dev);
5465 EXPORT_SYMBOL(netdev_update_features);
5468 * netdev_change_features - recalculate device features
5469 * @dev: the device to check
5471 * Recalculate dev->features set and send notifications even
5472 * if they have not changed. Should be called instead of
5473 * netdev_update_features() if also dev->vlan_features might
5474 * have changed to allow the changes to be propagated to stacked
5477 void netdev_change_features(struct net_device *dev)
5479 __netdev_update_features(dev);
5480 netdev_features_change(dev);
5482 EXPORT_SYMBOL(netdev_change_features);
5485 * netif_stacked_transfer_operstate - transfer operstate
5486 * @rootdev: the root or lower level device to transfer state from
5487 * @dev: the device to transfer operstate to
5489 * Transfer operational state from root to device. This is normally
5490 * called when a stacking relationship exists between the root
5491 * device and the device(a leaf device).
5493 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5494 struct net_device *dev)
5496 if (rootdev->operstate == IF_OPER_DORMANT)
5497 netif_dormant_on(dev);
5499 netif_dormant_off(dev);
5501 if (netif_carrier_ok(rootdev)) {
5502 if (!netif_carrier_ok(dev))
5503 netif_carrier_on(dev);
5505 if (netif_carrier_ok(dev))
5506 netif_carrier_off(dev);
5509 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5512 static int netif_alloc_rx_queues(struct net_device *dev)
5514 unsigned int i, count = dev->num_rx_queues;
5515 struct netdev_rx_queue *rx;
5519 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5521 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5526 for (i = 0; i < count; i++)
5532 static void netdev_init_one_queue(struct net_device *dev,
5533 struct netdev_queue *queue, void *_unused)
5535 /* Initialize queue lock */
5536 spin_lock_init(&queue->_xmit_lock);
5537 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5538 queue->xmit_lock_owner = -1;
5539 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5543 static int netif_alloc_netdev_queues(struct net_device *dev)
5545 unsigned int count = dev->num_tx_queues;
5546 struct netdev_queue *tx;
5550 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5552 pr_err("netdev: Unable to allocate %u tx queues.\n",
5558 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5559 spin_lock_init(&dev->tx_global_lock);
5565 * register_netdevice - register a network device
5566 * @dev: device to register
5568 * Take a completed network device structure and add it to the kernel
5569 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5570 * chain. 0 is returned on success. A negative errno code is returned
5571 * on a failure to set up the device, or if the name is a duplicate.
5573 * Callers must hold the rtnl semaphore. You may want
5574 * register_netdev() instead of this.
5577 * The locking appears insufficient to guarantee two parallel registers
5578 * will not get the same name.
5581 int register_netdevice(struct net_device *dev)
5584 struct net *net = dev_net(dev);
5586 BUG_ON(dev_boot_phase);
5591 /* When net_device's are persistent, this will be fatal. */
5592 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5595 spin_lock_init(&dev->addr_list_lock);
5596 netdev_set_addr_lockdep_class(dev);
5600 ret = dev_get_valid_name(dev, dev->name);
5604 /* Init, if this function is available */
5605 if (dev->netdev_ops->ndo_init) {
5606 ret = dev->netdev_ops->ndo_init(dev);
5614 dev->ifindex = dev_new_index(net);
5615 if (dev->iflink == -1)
5616 dev->iflink = dev->ifindex;
5618 /* Transfer changeable features to wanted_features and enable
5619 * software offloads (GSO and GRO).
5621 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5622 dev->features |= NETIF_F_SOFT_FEATURES;
5623 dev->wanted_features = dev->features & dev->hw_features;
5625 /* Turn on no cache copy if HW is doing checksum */
5626 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5627 if ((dev->features & NETIF_F_ALL_CSUM) &&
5628 !(dev->features & NETIF_F_NO_CSUM)) {
5629 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5630 dev->features |= NETIF_F_NOCACHE_COPY;
5633 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5635 dev->vlan_features |= NETIF_F_HIGHDMA;
5637 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5638 ret = notifier_to_errno(ret);
5642 ret = netdev_register_kobject(dev);
5645 dev->reg_state = NETREG_REGISTERED;
5647 __netdev_update_features(dev);
5650 * Default initial state at registry is that the
5651 * device is present.
5654 set_bit(__LINK_STATE_PRESENT, &dev->state);
5656 dev_init_scheduler(dev);
5658 list_netdevice(dev);
5659 add_device_randomness(dev->dev_addr, dev->addr_len);
5661 /* Notify protocols, that a new device appeared. */
5662 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5663 ret = notifier_to_errno(ret);
5665 rollback_registered(dev);
5666 dev->reg_state = NETREG_UNREGISTERED;
5669 * Prevent userspace races by waiting until the network
5670 * device is fully setup before sending notifications.
5672 if (!dev->rtnl_link_ops ||
5673 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5674 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5680 if (dev->netdev_ops->ndo_uninit)
5681 dev->netdev_ops->ndo_uninit(dev);
5684 EXPORT_SYMBOL(register_netdevice);
5687 * init_dummy_netdev - init a dummy network device for NAPI
5688 * @dev: device to init
5690 * This takes a network device structure and initialize the minimum
5691 * amount of fields so it can be used to schedule NAPI polls without
5692 * registering a full blown interface. This is to be used by drivers
5693 * that need to tie several hardware interfaces to a single NAPI
5694 * poll scheduler due to HW limitations.
5696 int init_dummy_netdev(struct net_device *dev)
5698 /* Clear everything. Note we don't initialize spinlocks
5699 * are they aren't supposed to be taken by any of the
5700 * NAPI code and this dummy netdev is supposed to be
5701 * only ever used for NAPI polls
5703 memset(dev, 0, sizeof(struct net_device));
5705 /* make sure we BUG if trying to hit standard
5706 * register/unregister code path
5708 dev->reg_state = NETREG_DUMMY;
5710 /* NAPI wants this */
5711 INIT_LIST_HEAD(&dev->napi_list);
5713 /* a dummy interface is started by default */
5714 set_bit(__LINK_STATE_PRESENT, &dev->state);
5715 set_bit(__LINK_STATE_START, &dev->state);
5717 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5718 * because users of this 'device' dont need to change
5724 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5728 * register_netdev - register a network device
5729 * @dev: device to register
5731 * Take a completed network device structure and add it to the kernel
5732 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5733 * chain. 0 is returned on success. A negative errno code is returned
5734 * on a failure to set up the device, or if the name is a duplicate.
5736 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5737 * and expands the device name if you passed a format string to
5740 int register_netdev(struct net_device *dev)
5745 err = register_netdevice(dev);
5749 EXPORT_SYMBOL(register_netdev);
5751 int netdev_refcnt_read(const struct net_device *dev)
5755 for_each_possible_cpu(i)
5756 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5759 EXPORT_SYMBOL(netdev_refcnt_read);
5762 * netdev_wait_allrefs - wait until all references are gone.
5764 * This is called when unregistering network devices.
5766 * Any protocol or device that holds a reference should register
5767 * for netdevice notification, and cleanup and put back the
5768 * reference if they receive an UNREGISTER event.
5769 * We can get stuck here if buggy protocols don't correctly
5772 static void netdev_wait_allrefs(struct net_device *dev)
5774 unsigned long rebroadcast_time, warning_time;
5777 linkwatch_forget_dev(dev);
5779 rebroadcast_time = warning_time = jiffies;
5780 refcnt = netdev_refcnt_read(dev);
5782 while (refcnt != 0) {
5783 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5786 /* Rebroadcast unregister notification */
5787 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5788 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5789 * should have already handle it the first time */
5791 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5793 /* We must not have linkwatch events
5794 * pending on unregister. If this
5795 * happens, we simply run the queue
5796 * unscheduled, resulting in a noop
5799 linkwatch_run_queue();
5804 rebroadcast_time = jiffies;
5809 refcnt = netdev_refcnt_read(dev);
5811 if (time_after(jiffies, warning_time + 10 * HZ)) {
5812 printk(KERN_EMERG "unregister_netdevice: "
5813 "waiting for %s to become free. Usage "
5816 warning_time = jiffies;
5825 * register_netdevice(x1);
5826 * register_netdevice(x2);
5828 * unregister_netdevice(y1);
5829 * unregister_netdevice(y2);
5835 * We are invoked by rtnl_unlock().
5836 * This allows us to deal with problems:
5837 * 1) We can delete sysfs objects which invoke hotplug
5838 * without deadlocking with linkwatch via keventd.
5839 * 2) Since we run with the RTNL semaphore not held, we can sleep
5840 * safely in order to wait for the netdev refcnt to drop to zero.
5842 * We must not return until all unregister events added during
5843 * the interval the lock was held have been completed.
5845 void netdev_run_todo(void)
5847 struct list_head list;
5849 /* Snapshot list, allow later requests */
5850 list_replace_init(&net_todo_list, &list);
5854 /* Wait for rcu callbacks to finish before attempting to drain
5855 * the device list. This usually avoids a 250ms wait.
5857 if (!list_empty(&list))
5860 while (!list_empty(&list)) {
5861 struct net_device *dev
5862 = list_first_entry(&list, struct net_device, todo_list);
5863 list_del(&dev->todo_list);
5865 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5866 printk(KERN_ERR "network todo '%s' but state %d\n",
5867 dev->name, dev->reg_state);
5872 dev->reg_state = NETREG_UNREGISTERED;
5874 on_each_cpu(flush_backlog, dev, 1);
5876 netdev_wait_allrefs(dev);
5879 BUG_ON(netdev_refcnt_read(dev));
5880 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5881 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5882 WARN_ON(dev->dn_ptr);
5884 if (dev->destructor)
5885 dev->destructor(dev);
5887 /* Free network device */
5888 kobject_put(&dev->dev.kobj);
5892 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5893 * fields in the same order, with only the type differing.
5895 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5896 const struct net_device_stats *netdev_stats)
5898 #if BITS_PER_LONG == 64
5899 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5900 memcpy(stats64, netdev_stats, sizeof(*stats64));
5902 size_t i, n = sizeof(*stats64) / sizeof(u64);
5903 const unsigned long *src = (const unsigned long *)netdev_stats;
5904 u64 *dst = (u64 *)stats64;
5906 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5907 sizeof(*stats64) / sizeof(u64));
5908 for (i = 0; i < n; i++)
5914 * dev_get_stats - get network device statistics
5915 * @dev: device to get statistics from
5916 * @storage: place to store stats
5918 * Get network statistics from device. Return @storage.
5919 * The device driver may provide its own method by setting
5920 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5921 * otherwise the internal statistics structure is used.
5923 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5924 struct rtnl_link_stats64 *storage)
5926 const struct net_device_ops *ops = dev->netdev_ops;
5928 if (ops->ndo_get_stats64) {
5929 memset(storage, 0, sizeof(*storage));
5930 ops->ndo_get_stats64(dev, storage);
5931 } else if (ops->ndo_get_stats) {
5932 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5934 netdev_stats_to_stats64(storage, &dev->stats);
5936 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5939 EXPORT_SYMBOL(dev_get_stats);
5941 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5943 struct netdev_queue *queue = dev_ingress_queue(dev);
5945 #ifdef CONFIG_NET_CLS_ACT
5948 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5951 netdev_init_one_queue(dev, queue, NULL);
5952 queue->qdisc = &noop_qdisc;
5953 queue->qdisc_sleeping = &noop_qdisc;
5954 rcu_assign_pointer(dev->ingress_queue, queue);
5960 * alloc_netdev_mqs - allocate network device
5961 * @sizeof_priv: size of private data to allocate space for
5962 * @name: device name format string
5963 * @setup: callback to initialize device
5964 * @txqs: the number of TX subqueues to allocate
5965 * @rxqs: the number of RX subqueues to allocate
5967 * Allocates a struct net_device with private data area for driver use
5968 * and performs basic initialization. Also allocates subquue structs
5969 * for each queue on the device.
5971 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5972 void (*setup)(struct net_device *),
5973 unsigned int txqs, unsigned int rxqs)
5975 struct net_device *dev;
5977 struct net_device *p;
5979 BUG_ON(strlen(name) >= sizeof(dev->name));
5982 pr_err("alloc_netdev: Unable to allocate device "
5983 "with zero queues.\n");
5989 pr_err("alloc_netdev: Unable to allocate device "
5990 "with zero RX queues.\n");
5995 alloc_size = sizeof(struct net_device);
5997 /* ensure 32-byte alignment of private area */
5998 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5999 alloc_size += sizeof_priv;
6001 /* ensure 32-byte alignment of whole construct */
6002 alloc_size += NETDEV_ALIGN - 1;
6004 p = kzalloc(alloc_size, GFP_KERNEL);
6006 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
6010 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6011 dev->padded = (char *)dev - (char *)p;
6013 dev->pcpu_refcnt = alloc_percpu(int);
6014 if (!dev->pcpu_refcnt)
6017 if (dev_addr_init(dev))
6023 dev_net_set(dev, &init_net);
6025 dev->gso_max_size = GSO_MAX_SIZE;
6026 dev->gso_max_segs = GSO_MAX_SEGS;
6028 INIT_LIST_HEAD(&dev->napi_list);
6029 INIT_LIST_HEAD(&dev->unreg_list);
6030 INIT_LIST_HEAD(&dev->link_watch_list);
6031 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6034 dev->num_tx_queues = txqs;
6035 dev->real_num_tx_queues = txqs;
6036 if (netif_alloc_netdev_queues(dev))
6040 dev->num_rx_queues = rxqs;
6041 dev->real_num_rx_queues = rxqs;
6042 if (netif_alloc_rx_queues(dev))
6046 strcpy(dev->name, name);
6047 dev->group = INIT_NETDEV_GROUP;
6055 free_percpu(dev->pcpu_refcnt);
6065 EXPORT_SYMBOL(alloc_netdev_mqs);
6068 * free_netdev - free network device
6071 * This function does the last stage of destroying an allocated device
6072 * interface. The reference to the device object is released.
6073 * If this is the last reference then it will be freed.
6075 void free_netdev(struct net_device *dev)
6077 struct napi_struct *p, *n;
6079 release_net(dev_net(dev));
6086 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6088 /* Flush device addresses */
6089 dev_addr_flush(dev);
6091 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6094 free_percpu(dev->pcpu_refcnt);
6095 dev->pcpu_refcnt = NULL;
6097 /* Compatibility with error handling in drivers */
6098 if (dev->reg_state == NETREG_UNINITIALIZED) {
6099 kfree((char *)dev - dev->padded);
6103 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6104 dev->reg_state = NETREG_RELEASED;
6106 /* will free via device release */
6107 put_device(&dev->dev);
6109 EXPORT_SYMBOL(free_netdev);
6112 * synchronize_net - Synchronize with packet receive processing
6114 * Wait for packets currently being received to be done.
6115 * Does not block later packets from starting.
6117 void synchronize_net(void)
6120 if (rtnl_is_locked())
6121 synchronize_rcu_expedited();
6125 EXPORT_SYMBOL(synchronize_net);
6128 * unregister_netdevice_queue - remove device from the kernel
6132 * This function shuts down a device interface and removes it
6133 * from the kernel tables.
6134 * If head not NULL, device is queued to be unregistered later.
6136 * Callers must hold the rtnl semaphore. You may want
6137 * unregister_netdev() instead of this.
6140 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6145 list_move_tail(&dev->unreg_list, head);
6147 rollback_registered(dev);
6148 /* Finish processing unregister after unlock */
6152 EXPORT_SYMBOL(unregister_netdevice_queue);
6155 * unregister_netdevice_many - unregister many devices
6156 * @head: list of devices
6158 void unregister_netdevice_many(struct list_head *head)
6160 struct net_device *dev;
6162 if (!list_empty(head)) {
6163 rollback_registered_many(head);
6164 list_for_each_entry(dev, head, unreg_list)
6168 EXPORT_SYMBOL(unregister_netdevice_many);
6171 * unregister_netdev - remove device from the kernel
6174 * This function shuts down a device interface and removes it
6175 * from the kernel tables.
6177 * This is just a wrapper for unregister_netdevice that takes
6178 * the rtnl semaphore. In general you want to use this and not
6179 * unregister_netdevice.
6181 void unregister_netdev(struct net_device *dev)
6184 unregister_netdevice(dev);
6187 EXPORT_SYMBOL(unregister_netdev);
6190 * dev_change_net_namespace - move device to different nethost namespace
6192 * @net: network namespace
6193 * @pat: If not NULL name pattern to try if the current device name
6194 * is already taken in the destination network namespace.
6196 * This function shuts down a device interface and moves it
6197 * to a new network namespace. On success 0 is returned, on
6198 * a failure a netagive errno code is returned.
6200 * Callers must hold the rtnl semaphore.
6203 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6209 /* Don't allow namespace local devices to be moved. */
6211 if (dev->features & NETIF_F_NETNS_LOCAL)
6214 /* Ensure the device has been registrered */
6216 if (dev->reg_state != NETREG_REGISTERED)
6219 /* Get out if there is nothing todo */
6221 if (net_eq(dev_net(dev), net))
6224 /* Pick the destination device name, and ensure
6225 * we can use it in the destination network namespace.
6228 if (__dev_get_by_name(net, dev->name)) {
6229 /* We get here if we can't use the current device name */
6232 if (dev_get_valid_name(dev, pat) < 0)
6237 * And now a mini version of register_netdevice unregister_netdevice.
6240 /* If device is running close it first. */
6243 /* And unlink it from device chain */
6245 unlist_netdevice(dev);
6249 /* Shutdown queueing discipline. */
6252 /* Notify protocols, that we are about to destroy
6253 this device. They should clean all the things.
6255 Note that dev->reg_state stays at NETREG_REGISTERED.
6256 This is wanted because this way 8021q and macvlan know
6257 the device is just moving and can keep their slaves up.
6259 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6260 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6261 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6264 * Flush the unicast and multicast chains
6269 /* Actually switch the network namespace */
6270 dev_net_set(dev, net);
6272 /* If there is an ifindex conflict assign a new one */
6273 if (__dev_get_by_index(net, dev->ifindex)) {
6274 int iflink = (dev->iflink == dev->ifindex);
6275 dev->ifindex = dev_new_index(net);
6277 dev->iflink = dev->ifindex;
6280 /* Fixup kobjects */
6281 err = device_rename(&dev->dev, dev->name);
6284 /* Add the device back in the hashes */
6285 list_netdevice(dev);
6287 /* Notify protocols, that a new device appeared. */
6288 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6291 * Prevent userspace races by waiting until the network
6292 * device is fully setup before sending notifications.
6294 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6301 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6303 static int dev_cpu_callback(struct notifier_block *nfb,
6304 unsigned long action,
6307 struct sk_buff **list_skb;
6308 struct sk_buff *skb;
6309 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6310 struct softnet_data *sd, *oldsd;
6312 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6315 local_irq_disable();
6316 cpu = smp_processor_id();
6317 sd = &per_cpu(softnet_data, cpu);
6318 oldsd = &per_cpu(softnet_data, oldcpu);
6320 /* Find end of our completion_queue. */
6321 list_skb = &sd->completion_queue;
6323 list_skb = &(*list_skb)->next;
6324 /* Append completion queue from offline CPU. */
6325 *list_skb = oldsd->completion_queue;
6326 oldsd->completion_queue = NULL;
6328 /* Append output queue from offline CPU. */
6329 if (oldsd->output_queue) {
6330 *sd->output_queue_tailp = oldsd->output_queue;
6331 sd->output_queue_tailp = oldsd->output_queue_tailp;
6332 oldsd->output_queue = NULL;
6333 oldsd->output_queue_tailp = &oldsd->output_queue;
6335 /* Append NAPI poll list from offline CPU. */
6336 if (!list_empty(&oldsd->poll_list)) {
6337 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6338 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6341 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6344 /* Process offline CPU's input_pkt_queue */
6345 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6347 input_queue_head_incr(oldsd);
6349 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6351 input_queue_head_incr(oldsd);
6359 * netdev_increment_features - increment feature set by one
6360 * @all: current feature set
6361 * @one: new feature set
6362 * @mask: mask feature set
6364 * Computes a new feature set after adding a device with feature set
6365 * @one to the master device with current feature set @all. Will not
6366 * enable anything that is off in @mask. Returns the new feature set.
6368 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6370 if (mask & NETIF_F_GEN_CSUM)
6371 mask |= NETIF_F_ALL_CSUM;
6372 mask |= NETIF_F_VLAN_CHALLENGED;
6374 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6375 all &= one | ~NETIF_F_ALL_FOR_ALL;
6377 /* If device needs checksumming, downgrade to it. */
6378 if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
6379 all &= ~NETIF_F_NO_CSUM;
6381 /* If one device supports hw checksumming, set for all. */
6382 if (all & NETIF_F_GEN_CSUM)
6383 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6387 EXPORT_SYMBOL(netdev_increment_features);
6389 static struct hlist_head *netdev_create_hash(void)
6392 struct hlist_head *hash;
6394 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6396 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6397 INIT_HLIST_HEAD(&hash[i]);
6402 /* Initialize per network namespace state */
6403 static int __net_init netdev_init(struct net *net)
6405 if (net != &init_net)
6406 INIT_LIST_HEAD(&net->dev_base_head);
6408 net->dev_name_head = netdev_create_hash();
6409 if (net->dev_name_head == NULL)
6412 net->dev_index_head = netdev_create_hash();
6413 if (net->dev_index_head == NULL)
6419 kfree(net->dev_name_head);
6425 * netdev_drivername - network driver for the device
6426 * @dev: network device
6428 * Determine network driver for device.
6430 const char *netdev_drivername(const struct net_device *dev)
6432 const struct device_driver *driver;
6433 const struct device *parent;
6434 const char *empty = "";
6436 parent = dev->dev.parent;
6440 driver = parent->driver;
6441 if (driver && driver->name)
6442 return driver->name;
6446 int __netdev_printk(const char *level, const struct net_device *dev,
6447 struct va_format *vaf)
6451 if (dev && dev->dev.parent)
6452 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6453 netdev_name(dev), vaf);
6455 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6457 r = printk("%s(NULL net_device): %pV", level, vaf);
6461 EXPORT_SYMBOL(__netdev_printk);
6463 int netdev_printk(const char *level, const struct net_device *dev,
6464 const char *format, ...)
6466 struct va_format vaf;
6470 va_start(args, format);
6475 r = __netdev_printk(level, dev, &vaf);
6480 EXPORT_SYMBOL(netdev_printk);
6482 #define define_netdev_printk_level(func, level) \
6483 int func(const struct net_device *dev, const char *fmt, ...) \
6486 struct va_format vaf; \
6489 va_start(args, fmt); \
6494 r = __netdev_printk(level, dev, &vaf); \
6499 EXPORT_SYMBOL(func);
6501 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6502 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6503 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6504 define_netdev_printk_level(netdev_err, KERN_ERR);
6505 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6506 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6507 define_netdev_printk_level(netdev_info, KERN_INFO);
6509 static void __net_exit netdev_exit(struct net *net)
6511 kfree(net->dev_name_head);
6512 kfree(net->dev_index_head);
6515 static struct pernet_operations __net_initdata netdev_net_ops = {
6516 .init = netdev_init,
6517 .exit = netdev_exit,
6520 static void __net_exit default_device_exit(struct net *net)
6522 struct net_device *dev, *aux;
6524 * Push all migratable network devices back to the
6525 * initial network namespace
6528 for_each_netdev_safe(net, dev, aux) {
6530 char fb_name[IFNAMSIZ];
6532 /* Ignore unmoveable devices (i.e. loopback) */
6533 if (dev->features & NETIF_F_NETNS_LOCAL)
6536 /* Leave virtual devices for the generic cleanup */
6537 if (dev->rtnl_link_ops)
6540 /* Push remaining network devices to init_net */
6541 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6542 err = dev_change_net_namespace(dev, &init_net, fb_name);
6544 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6545 __func__, dev->name, err);
6552 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6554 /* At exit all network devices most be removed from a network
6555 * namespace. Do this in the reverse order of registration.
6556 * Do this across as many network namespaces as possible to
6557 * improve batching efficiency.
6559 struct net_device *dev;
6561 LIST_HEAD(dev_kill_list);
6564 list_for_each_entry(net, net_list, exit_list) {
6565 for_each_netdev_reverse(net, dev) {
6566 if (dev->rtnl_link_ops)
6567 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6569 unregister_netdevice_queue(dev, &dev_kill_list);
6572 unregister_netdevice_many(&dev_kill_list);
6573 list_del(&dev_kill_list);
6577 static struct pernet_operations __net_initdata default_device_ops = {
6578 .exit = default_device_exit,
6579 .exit_batch = default_device_exit_batch,
6583 * Initialize the DEV module. At boot time this walks the device list and
6584 * unhooks any devices that fail to initialise (normally hardware not
6585 * present) and leaves us with a valid list of present and active devices.
6590 * This is called single threaded during boot, so no need
6591 * to take the rtnl semaphore.
6593 static int __init net_dev_init(void)
6595 int i, rc = -ENOMEM;
6597 BUG_ON(!dev_boot_phase);
6599 if (dev_proc_init())
6602 if (netdev_kobject_init())
6605 INIT_LIST_HEAD(&ptype_all);
6606 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6607 INIT_LIST_HEAD(&ptype_base[i]);
6609 if (register_pernet_subsys(&netdev_net_ops))
6613 * Initialise the packet receive queues.
6616 for_each_possible_cpu(i) {
6617 struct softnet_data *sd = &per_cpu(softnet_data, i);
6619 memset(sd, 0, sizeof(*sd));
6620 skb_queue_head_init(&sd->input_pkt_queue);
6621 skb_queue_head_init(&sd->process_queue);
6622 sd->completion_queue = NULL;
6623 INIT_LIST_HEAD(&sd->poll_list);
6624 sd->output_queue = NULL;
6625 sd->output_queue_tailp = &sd->output_queue;
6627 sd->csd.func = rps_trigger_softirq;
6633 sd->backlog.poll = process_backlog;
6634 sd->backlog.weight = weight_p;
6635 sd->backlog.gro_list = NULL;
6636 sd->backlog.gro_count = 0;
6641 /* The loopback device is special if any other network devices
6642 * is present in a network namespace the loopback device must
6643 * be present. Since we now dynamically allocate and free the
6644 * loopback device ensure this invariant is maintained by
6645 * keeping the loopback device as the first device on the
6646 * list of network devices. Ensuring the loopback devices
6647 * is the first device that appears and the last network device
6650 if (register_pernet_device(&loopback_net_ops))
6653 if (register_pernet_device(&default_device_ops))
6656 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6657 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6659 hotcpu_notifier(dev_cpu_callback, 0);
6667 subsys_initcall(net_dev_init);
6669 static int __init initialize_hashrnd(void)
6671 get_random_bytes(&hashrnd, sizeof(hashrnd));
6675 late_initcall_sync(initialize_hashrnd);