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)
1064 if (len >= IFALIASZ)
1069 kfree(dev->ifalias);
1070 dev->ifalias = NULL;
1075 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1079 strlcpy(dev->ifalias, alias, len+1);
1085 * netdev_features_change - device changes features
1086 * @dev: device to cause notification
1088 * Called to indicate a device has changed features.
1090 void netdev_features_change(struct net_device *dev)
1092 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1094 EXPORT_SYMBOL(netdev_features_change);
1097 * netdev_state_change - device changes state
1098 * @dev: device to cause notification
1100 * Called to indicate a device has changed state. This function calls
1101 * the notifier chains for netdev_chain and sends a NEWLINK message
1102 * to the routing socket.
1104 void netdev_state_change(struct net_device *dev)
1106 if (dev->flags & IFF_UP) {
1107 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1108 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1111 EXPORT_SYMBOL(netdev_state_change);
1113 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1115 return call_netdevice_notifiers(event, dev);
1117 EXPORT_SYMBOL(netdev_bonding_change);
1120 * dev_load - load a network module
1121 * @net: the applicable net namespace
1122 * @name: name of interface
1124 * If a network interface is not present and the process has suitable
1125 * privileges this function loads the module. If module loading is not
1126 * available in this kernel then it becomes a nop.
1129 void dev_load(struct net *net, const char *name)
1131 struct net_device *dev;
1135 dev = dev_get_by_name_rcu(net, name);
1139 if (no_module && capable(CAP_NET_ADMIN))
1140 no_module = request_module("netdev-%s", name);
1141 if (no_module && capable(CAP_SYS_MODULE)) {
1142 if (!request_module("%s", name))
1143 pr_err("Loading kernel module for a network device "
1144 "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s "
1148 EXPORT_SYMBOL(dev_load);
1150 static int __dev_open(struct net_device *dev)
1152 const struct net_device_ops *ops = dev->netdev_ops;
1157 if (!netif_device_present(dev))
1160 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1161 ret = notifier_to_errno(ret);
1165 set_bit(__LINK_STATE_START, &dev->state);
1167 if (ops->ndo_validate_addr)
1168 ret = ops->ndo_validate_addr(dev);
1170 if (!ret && ops->ndo_open)
1171 ret = ops->ndo_open(dev);
1174 clear_bit(__LINK_STATE_START, &dev->state);
1176 dev->flags |= IFF_UP;
1177 net_dmaengine_get();
1178 dev_set_rx_mode(dev);
1180 add_device_randomness(dev->dev_addr, dev->addr_len);
1187 * dev_open - prepare an interface for use.
1188 * @dev: device to open
1190 * Takes a device from down to up state. The device's private open
1191 * function is invoked and then the multicast lists are loaded. Finally
1192 * the device is moved into the up state and a %NETDEV_UP message is
1193 * sent to the netdev notifier chain.
1195 * Calling this function on an active interface is a nop. On a failure
1196 * a negative errno code is returned.
1198 int dev_open(struct net_device *dev)
1202 if (dev->flags & IFF_UP)
1205 ret = __dev_open(dev);
1209 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1210 call_netdevice_notifiers(NETDEV_UP, dev);
1214 EXPORT_SYMBOL(dev_open);
1216 static int __dev_close_many(struct list_head *head)
1218 struct net_device *dev;
1223 list_for_each_entry(dev, head, unreg_list) {
1224 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1226 clear_bit(__LINK_STATE_START, &dev->state);
1228 /* Synchronize to scheduled poll. We cannot touch poll list, it
1229 * can be even on different cpu. So just clear netif_running().
1231 * dev->stop() will invoke napi_disable() on all of it's
1232 * napi_struct instances on this device.
1234 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1237 dev_deactivate_many(head);
1239 list_for_each_entry(dev, head, unreg_list) {
1240 const struct net_device_ops *ops = dev->netdev_ops;
1243 * Call the device specific close. This cannot fail.
1244 * Only if device is UP
1246 * We allow it to be called even after a DETACH hot-plug
1252 dev->flags &= ~IFF_UP;
1253 net_dmaengine_put();
1259 static int __dev_close(struct net_device *dev)
1264 list_add(&dev->unreg_list, &single);
1265 retval = __dev_close_many(&single);
1270 static int dev_close_many(struct list_head *head)
1272 struct net_device *dev, *tmp;
1273 LIST_HEAD(tmp_list);
1275 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1276 if (!(dev->flags & IFF_UP))
1277 list_move(&dev->unreg_list, &tmp_list);
1279 __dev_close_many(head);
1281 list_for_each_entry(dev, head, unreg_list) {
1282 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1283 call_netdevice_notifiers(NETDEV_DOWN, dev);
1286 /* rollback_registered_many needs the complete original list */
1287 list_splice(&tmp_list, head);
1292 * dev_close - shutdown an interface.
1293 * @dev: device to shutdown
1295 * This function moves an active device into down state. A
1296 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1297 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1300 int dev_close(struct net_device *dev)
1302 if (dev->flags & IFF_UP) {
1305 list_add(&dev->unreg_list, &single);
1306 dev_close_many(&single);
1311 EXPORT_SYMBOL(dev_close);
1315 * dev_disable_lro - disable Large Receive Offload on a device
1318 * Disable Large Receive Offload (LRO) on a net device. Must be
1319 * called under RTNL. This is needed if received packets may be
1320 * forwarded to another interface.
1322 void dev_disable_lro(struct net_device *dev)
1327 * If we're trying to disable lro on a vlan device
1328 * use the underlying physical device instead
1330 if (is_vlan_dev(dev))
1331 dev = vlan_dev_real_dev(dev);
1333 if (dev->ethtool_ops && dev->ethtool_ops->get_flags)
1334 flags = dev->ethtool_ops->get_flags(dev);
1336 flags = ethtool_op_get_flags(dev);
1338 if (!(flags & ETH_FLAG_LRO))
1341 __ethtool_set_flags(dev, flags & ~ETH_FLAG_LRO);
1342 if (unlikely(dev->features & NETIF_F_LRO))
1343 netdev_WARN(dev, "failed to disable LRO!\n");
1345 EXPORT_SYMBOL(dev_disable_lro);
1348 static int dev_boot_phase = 1;
1351 * register_netdevice_notifier - register a network notifier block
1354 * Register a notifier to be called when network device events occur.
1355 * The notifier passed is linked into the kernel structures and must
1356 * not be reused until it has been unregistered. A negative errno code
1357 * is returned on a failure.
1359 * When registered all registration and up events are replayed
1360 * to the new notifier to allow device to have a race free
1361 * view of the network device list.
1364 int register_netdevice_notifier(struct notifier_block *nb)
1366 struct net_device *dev;
1367 struct net_device *last;
1372 err = raw_notifier_chain_register(&netdev_chain, nb);
1378 for_each_netdev(net, dev) {
1379 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1380 err = notifier_to_errno(err);
1384 if (!(dev->flags & IFF_UP))
1387 nb->notifier_call(nb, NETDEV_UP, dev);
1398 for_each_netdev(net, dev) {
1402 if (dev->flags & IFF_UP) {
1403 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1404 nb->notifier_call(nb, NETDEV_DOWN, dev);
1406 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1407 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1412 raw_notifier_chain_unregister(&netdev_chain, nb);
1415 EXPORT_SYMBOL(register_netdevice_notifier);
1418 * unregister_netdevice_notifier - unregister a network notifier block
1421 * Unregister a notifier previously registered by
1422 * register_netdevice_notifier(). The notifier is unlinked into the
1423 * kernel structures and may then be reused. A negative errno code
1424 * is returned on a failure.
1426 * After unregistering unregister and down device events are synthesized
1427 * for all devices on the device list to the removed notifier to remove
1428 * the need for special case cleanup code.
1431 int unregister_netdevice_notifier(struct notifier_block *nb)
1433 struct net_device *dev;
1438 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1443 for_each_netdev(net, dev) {
1444 if (dev->flags & IFF_UP) {
1445 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1446 nb->notifier_call(nb, NETDEV_DOWN, dev);
1448 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1449 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1456 EXPORT_SYMBOL(unregister_netdevice_notifier);
1459 * call_netdevice_notifiers - call all network notifier blocks
1460 * @val: value passed unmodified to notifier function
1461 * @dev: net_device pointer passed unmodified to notifier function
1463 * Call all network notifier blocks. Parameters and return value
1464 * are as for raw_notifier_call_chain().
1467 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1470 return raw_notifier_call_chain(&netdev_chain, val, dev);
1472 EXPORT_SYMBOL(call_netdevice_notifiers);
1474 /* When > 0 there are consumers of rx skb time stamps */
1475 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1477 void net_enable_timestamp(void)
1479 atomic_inc(&netstamp_needed);
1481 EXPORT_SYMBOL(net_enable_timestamp);
1483 void net_disable_timestamp(void)
1485 atomic_dec(&netstamp_needed);
1487 EXPORT_SYMBOL(net_disable_timestamp);
1489 static inline void net_timestamp_set(struct sk_buff *skb)
1491 if (atomic_read(&netstamp_needed))
1492 __net_timestamp(skb);
1494 skb->tstamp.tv64 = 0;
1497 static inline void net_timestamp_check(struct sk_buff *skb)
1499 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1500 __net_timestamp(skb);
1503 static int net_hwtstamp_validate(struct ifreq *ifr)
1505 struct hwtstamp_config cfg;
1506 enum hwtstamp_tx_types tx_type;
1507 enum hwtstamp_rx_filters rx_filter;
1508 int tx_type_valid = 0;
1509 int rx_filter_valid = 0;
1511 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1514 if (cfg.flags) /* reserved for future extensions */
1517 tx_type = cfg.tx_type;
1518 rx_filter = cfg.rx_filter;
1521 case HWTSTAMP_TX_OFF:
1522 case HWTSTAMP_TX_ON:
1523 case HWTSTAMP_TX_ONESTEP_SYNC:
1528 switch (rx_filter) {
1529 case HWTSTAMP_FILTER_NONE:
1530 case HWTSTAMP_FILTER_ALL:
1531 case HWTSTAMP_FILTER_SOME:
1532 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1533 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1534 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1535 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1536 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1537 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1538 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1539 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1540 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1541 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1542 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1543 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1544 rx_filter_valid = 1;
1548 if (!tx_type_valid || !rx_filter_valid)
1554 static inline bool is_skb_forwardable(struct net_device *dev,
1555 struct sk_buff *skb)
1559 if (!(dev->flags & IFF_UP))
1562 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1563 if (skb->len <= len)
1566 /* if TSO is enabled, we don't care about the length as the packet
1567 * could be forwarded without being segmented before
1569 if (skb_is_gso(skb))
1576 * dev_forward_skb - loopback an skb to another netif
1578 * @dev: destination network device
1579 * @skb: buffer to forward
1582 * NET_RX_SUCCESS (no congestion)
1583 * NET_RX_DROP (packet was dropped, but freed)
1585 * dev_forward_skb can be used for injecting an skb from the
1586 * start_xmit function of one device into the receive queue
1587 * of another device.
1589 * The receiving device may be in another namespace, so
1590 * we have to clear all information in the skb that could
1591 * impact namespace isolation.
1593 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1595 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1596 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1597 atomic_long_inc(&dev->rx_dropped);
1606 if (unlikely(!is_skb_forwardable(dev, skb))) {
1607 atomic_long_inc(&dev->rx_dropped);
1613 skb->tstamp.tv64 = 0;
1614 skb->pkt_type = PACKET_HOST;
1615 skb->protocol = eth_type_trans(skb, dev);
1619 return netif_rx(skb);
1621 EXPORT_SYMBOL_GPL(dev_forward_skb);
1623 static inline int deliver_skb(struct sk_buff *skb,
1624 struct packet_type *pt_prev,
1625 struct net_device *orig_dev)
1627 atomic_inc(&skb->users);
1628 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1632 * Support routine. Sends outgoing frames to any network
1633 * taps currently in use.
1636 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1638 struct packet_type *ptype;
1639 struct sk_buff *skb2 = NULL;
1640 struct packet_type *pt_prev = NULL;
1643 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1644 /* Never send packets back to the socket
1645 * they originated from - MvS (miquels@drinkel.ow.org)
1647 if ((ptype->dev == dev || !ptype->dev) &&
1648 (ptype->af_packet_priv == NULL ||
1649 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1651 deliver_skb(skb2, pt_prev, skb->dev);
1656 skb2 = skb_clone(skb, GFP_ATOMIC);
1660 net_timestamp_set(skb2);
1662 /* skb->nh should be correctly
1663 set by sender, so that the second statement is
1664 just protection against buggy protocols.
1666 skb_reset_mac_header(skb2);
1668 if (skb_network_header(skb2) < skb2->data ||
1669 skb2->network_header > skb2->tail) {
1670 if (net_ratelimit())
1671 printk(KERN_CRIT "protocol %04x is "
1673 ntohs(skb2->protocol),
1675 skb_reset_network_header(skb2);
1678 skb2->transport_header = skb2->network_header;
1679 skb2->pkt_type = PACKET_OUTGOING;
1684 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1688 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1689 * @dev: Network device
1690 * @txq: number of queues available
1692 * If real_num_tx_queues is changed the tc mappings may no longer be
1693 * valid. To resolve this verify the tc mapping remains valid and if
1694 * not NULL the mapping. With no priorities mapping to this
1695 * offset/count pair it will no longer be used. In the worst case TC0
1696 * is invalid nothing can be done so disable priority mappings. If is
1697 * expected that drivers will fix this mapping if they can before
1698 * calling netif_set_real_num_tx_queues.
1700 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1703 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1705 /* If TC0 is invalidated disable TC mapping */
1706 if (tc->offset + tc->count > txq) {
1707 pr_warning("Number of in use tx queues changed "
1708 "invalidating tc mappings. Priority "
1709 "traffic classification disabled!\n");
1714 /* Invalidated prio to tc mappings set to TC0 */
1715 for (i = 1; i < TC_BITMASK + 1; i++) {
1716 int q = netdev_get_prio_tc_map(dev, i);
1718 tc = &dev->tc_to_txq[q];
1719 if (tc->offset + tc->count > txq) {
1720 pr_warning("Number of in use tx queues "
1721 "changed. Priority %i to tc "
1722 "mapping %i is no longer valid "
1723 "setting map to 0\n",
1725 netdev_set_prio_tc_map(dev, i, 0);
1731 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1732 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1734 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1738 if (txq < 1 || txq > dev->num_tx_queues)
1741 if (dev->reg_state == NETREG_REGISTERED ||
1742 dev->reg_state == NETREG_UNREGISTERING) {
1745 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1751 netif_setup_tc(dev, txq);
1753 if (txq < dev->real_num_tx_queues)
1754 qdisc_reset_all_tx_gt(dev, txq);
1757 dev->real_num_tx_queues = txq;
1760 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1764 * netif_set_real_num_rx_queues - set actual number of RX queues used
1765 * @dev: Network device
1766 * @rxq: Actual number of RX queues
1768 * This must be called either with the rtnl_lock held or before
1769 * registration of the net device. Returns 0 on success, or a
1770 * negative error code. If called before registration, it always
1773 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1777 if (rxq < 1 || rxq > dev->num_rx_queues)
1780 if (dev->reg_state == NETREG_REGISTERED) {
1783 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1789 dev->real_num_rx_queues = rxq;
1792 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1795 static inline void __netif_reschedule(struct Qdisc *q)
1797 struct softnet_data *sd;
1798 unsigned long flags;
1800 local_irq_save(flags);
1801 sd = &__get_cpu_var(softnet_data);
1802 q->next_sched = NULL;
1803 *sd->output_queue_tailp = q;
1804 sd->output_queue_tailp = &q->next_sched;
1805 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1806 local_irq_restore(flags);
1809 void __netif_schedule(struct Qdisc *q)
1811 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1812 __netif_reschedule(q);
1814 EXPORT_SYMBOL(__netif_schedule);
1816 void dev_kfree_skb_irq(struct sk_buff *skb)
1818 if (atomic_dec_and_test(&skb->users)) {
1819 struct softnet_data *sd;
1820 unsigned long flags;
1822 local_irq_save(flags);
1823 sd = &__get_cpu_var(softnet_data);
1824 skb->next = sd->completion_queue;
1825 sd->completion_queue = skb;
1826 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1827 local_irq_restore(flags);
1830 EXPORT_SYMBOL(dev_kfree_skb_irq);
1832 void dev_kfree_skb_any(struct sk_buff *skb)
1834 if (in_irq() || irqs_disabled())
1835 dev_kfree_skb_irq(skb);
1839 EXPORT_SYMBOL(dev_kfree_skb_any);
1843 * netif_device_detach - mark device as removed
1844 * @dev: network device
1846 * Mark device as removed from system and therefore no longer available.
1848 void netif_device_detach(struct net_device *dev)
1850 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1851 netif_running(dev)) {
1852 netif_tx_stop_all_queues(dev);
1855 EXPORT_SYMBOL(netif_device_detach);
1858 * netif_device_attach - mark device as attached
1859 * @dev: network device
1861 * Mark device as attached from system and restart if needed.
1863 void netif_device_attach(struct net_device *dev)
1865 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1866 netif_running(dev)) {
1867 netif_tx_wake_all_queues(dev);
1868 __netdev_watchdog_up(dev);
1871 EXPORT_SYMBOL(netif_device_attach);
1874 * Invalidate hardware checksum when packet is to be mangled, and
1875 * complete checksum manually on outgoing path.
1877 int skb_checksum_help(struct sk_buff *skb)
1880 int ret = 0, offset;
1882 if (skb->ip_summed == CHECKSUM_COMPLETE)
1883 goto out_set_summed;
1885 if (unlikely(skb_shinfo(skb)->gso_size)) {
1886 /* Let GSO fix up the checksum. */
1887 goto out_set_summed;
1890 offset = skb_checksum_start_offset(skb);
1891 BUG_ON(offset >= skb_headlen(skb));
1892 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1894 offset += skb->csum_offset;
1895 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1897 if (skb_cloned(skb) &&
1898 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1899 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1904 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1906 skb->ip_summed = CHECKSUM_NONE;
1910 EXPORT_SYMBOL(skb_checksum_help);
1913 * skb_gso_segment - Perform segmentation on skb.
1914 * @skb: buffer to segment
1915 * @features: features for the output path (see dev->features)
1917 * This function segments the given skb and returns a list of segments.
1919 * It may return NULL if the skb requires no segmentation. This is
1920 * only possible when GSO is used for verifying header integrity.
1922 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1924 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1925 struct packet_type *ptype;
1926 __be16 type = skb->protocol;
1927 int vlan_depth = ETH_HLEN;
1930 while (type == htons(ETH_P_8021Q)) {
1931 struct vlan_hdr *vh;
1933 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1934 return ERR_PTR(-EINVAL);
1936 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1937 type = vh->h_vlan_encapsulated_proto;
1938 vlan_depth += VLAN_HLEN;
1941 skb_reset_mac_header(skb);
1942 skb->mac_len = skb->network_header - skb->mac_header;
1943 __skb_pull(skb, skb->mac_len);
1945 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1946 struct net_device *dev = skb->dev;
1947 struct ethtool_drvinfo info = {};
1949 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1950 dev->ethtool_ops->get_drvinfo(dev, &info);
1952 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1953 info.driver, dev ? dev->features : 0L,
1954 skb->sk ? skb->sk->sk_route_caps : 0L,
1955 skb->len, skb->data_len, skb->ip_summed);
1957 if (skb_header_cloned(skb) &&
1958 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1959 return ERR_PTR(err);
1963 list_for_each_entry_rcu(ptype,
1964 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1965 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1966 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1967 err = ptype->gso_send_check(skb);
1968 segs = ERR_PTR(err);
1969 if (err || skb_gso_ok(skb, features))
1971 __skb_push(skb, (skb->data -
1972 skb_network_header(skb)));
1974 segs = ptype->gso_segment(skb, features);
1980 __skb_push(skb, skb->data - skb_mac_header(skb));
1984 EXPORT_SYMBOL(skb_gso_segment);
1986 /* Take action when hardware reception checksum errors are detected. */
1988 void netdev_rx_csum_fault(struct net_device *dev)
1990 if (net_ratelimit()) {
1991 printk(KERN_ERR "%s: hw csum failure.\n",
1992 dev ? dev->name : "<unknown>");
1996 EXPORT_SYMBOL(netdev_rx_csum_fault);
1999 /* Actually, we should eliminate this check as soon as we know, that:
2000 * 1. IOMMU is present and allows to map all the memory.
2001 * 2. No high memory really exists on this machine.
2004 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2006 #ifdef CONFIG_HIGHMEM
2008 if (!(dev->features & NETIF_F_HIGHDMA)) {
2009 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2010 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2011 if (PageHighMem(skb_frag_page(frag)))
2016 if (PCI_DMA_BUS_IS_PHYS) {
2017 struct device *pdev = dev->dev.parent;
2021 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2022 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2023 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2024 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2033 void (*destructor)(struct sk_buff *skb);
2036 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2038 static void dev_gso_skb_destructor(struct sk_buff *skb)
2040 struct dev_gso_cb *cb;
2043 struct sk_buff *nskb = skb->next;
2045 skb->next = nskb->next;
2048 } while (skb->next);
2050 cb = DEV_GSO_CB(skb);
2052 cb->destructor(skb);
2056 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2057 * @skb: buffer to segment
2058 * @features: device features as applicable to this skb
2060 * This function segments the given skb and stores the list of segments
2063 static int dev_gso_segment(struct sk_buff *skb, int features)
2065 struct sk_buff *segs;
2067 segs = skb_gso_segment(skb, features);
2069 /* Verifying header integrity only. */
2074 return PTR_ERR(segs);
2077 DEV_GSO_CB(skb)->destructor = skb->destructor;
2078 skb->destructor = dev_gso_skb_destructor;
2083 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2085 return ((features & NETIF_F_GEN_CSUM) ||
2086 ((features & NETIF_F_V4_CSUM) &&
2087 protocol == htons(ETH_P_IP)) ||
2088 ((features & NETIF_F_V6_CSUM) &&
2089 protocol == htons(ETH_P_IPV6)) ||
2090 ((features & NETIF_F_FCOE_CRC) &&
2091 protocol == htons(ETH_P_FCOE)));
2094 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2096 if (!can_checksum_protocol(features, protocol)) {
2097 features &= ~NETIF_F_ALL_CSUM;
2098 features &= ~NETIF_F_SG;
2099 } else if (illegal_highdma(skb->dev, skb)) {
2100 features &= ~NETIF_F_SG;
2106 u32 netif_skb_features(struct sk_buff *skb)
2108 __be16 protocol = skb->protocol;
2109 u32 features = skb->dev->features;
2111 if (protocol == htons(ETH_P_8021Q)) {
2112 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2113 protocol = veh->h_vlan_encapsulated_proto;
2114 } else if (!vlan_tx_tag_present(skb)) {
2115 return harmonize_features(skb, protocol, features);
2118 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2120 if (protocol != htons(ETH_P_8021Q)) {
2121 return harmonize_features(skb, protocol, features);
2123 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2124 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2125 return harmonize_features(skb, protocol, features);
2128 EXPORT_SYMBOL(netif_skb_features);
2131 * Returns true if either:
2132 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2133 * 2. skb is fragmented and the device does not support SG, or if
2134 * at least one of fragments is in highmem and device does not
2135 * support DMA from it.
2137 static inline int skb_needs_linearize(struct sk_buff *skb,
2140 return skb_is_nonlinear(skb) &&
2141 ((skb_has_frag_list(skb) &&
2142 !(features & NETIF_F_FRAGLIST)) ||
2143 (skb_shinfo(skb)->nr_frags &&
2144 !(features & NETIF_F_SG)));
2147 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2148 struct netdev_queue *txq)
2150 const struct net_device_ops *ops = dev->netdev_ops;
2151 int rc = NETDEV_TX_OK;
2152 unsigned int skb_len;
2154 if (likely(!skb->next)) {
2158 * If device doesn't need skb->dst, release it right now while
2159 * its hot in this cpu cache
2161 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2164 if (!list_empty(&ptype_all))
2165 dev_queue_xmit_nit(skb, dev);
2167 features = netif_skb_features(skb);
2169 if (vlan_tx_tag_present(skb) &&
2170 !(features & NETIF_F_HW_VLAN_TX)) {
2171 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2178 if (netif_needs_gso(skb, features)) {
2179 if (unlikely(dev_gso_segment(skb, features)))
2184 if (skb_needs_linearize(skb, features) &&
2185 __skb_linearize(skb))
2188 /* If packet is not checksummed and device does not
2189 * support checksumming for this protocol, complete
2190 * checksumming here.
2192 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2193 skb_set_transport_header(skb,
2194 skb_checksum_start_offset(skb));
2195 if (!(features & NETIF_F_ALL_CSUM) &&
2196 skb_checksum_help(skb))
2202 rc = ops->ndo_start_xmit(skb, dev);
2203 trace_net_dev_xmit(skb, rc, dev, skb_len);
2204 if (rc == NETDEV_TX_OK)
2205 txq_trans_update(txq);
2211 struct sk_buff *nskb = skb->next;
2213 skb->next = nskb->next;
2217 * If device doesn't need nskb->dst, release it right now while
2218 * its hot in this cpu cache
2220 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2223 skb_len = nskb->len;
2224 rc = ops->ndo_start_xmit(nskb, dev);
2225 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2226 if (unlikely(rc != NETDEV_TX_OK)) {
2227 if (rc & ~NETDEV_TX_MASK)
2228 goto out_kfree_gso_skb;
2229 nskb->next = skb->next;
2233 txq_trans_update(txq);
2234 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2235 return NETDEV_TX_BUSY;
2236 } while (skb->next);
2239 if (likely(skb->next == NULL))
2240 skb->destructor = DEV_GSO_CB(skb)->destructor;
2247 static u32 hashrnd __read_mostly;
2250 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2251 * to be used as a distribution range.
2253 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2254 unsigned int num_tx_queues)
2258 u16 qcount = num_tx_queues;
2260 if (skb_rx_queue_recorded(skb)) {
2261 hash = skb_get_rx_queue(skb);
2262 while (unlikely(hash >= num_tx_queues))
2263 hash -= num_tx_queues;
2268 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2269 qoffset = dev->tc_to_txq[tc].offset;
2270 qcount = dev->tc_to_txq[tc].count;
2273 if (skb->sk && skb->sk->sk_hash)
2274 hash = skb->sk->sk_hash;
2276 hash = (__force u16) skb->protocol;
2277 hash = jhash_1word(hash, hashrnd);
2279 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2281 EXPORT_SYMBOL(__skb_tx_hash);
2283 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2285 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2286 if (net_ratelimit()) {
2287 pr_warning("%s selects TX queue %d, but "
2288 "real number of TX queues is %d\n",
2289 dev->name, queue_index, dev->real_num_tx_queues);
2296 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2299 struct xps_dev_maps *dev_maps;
2300 struct xps_map *map;
2301 int queue_index = -1;
2304 dev_maps = rcu_dereference(dev->xps_maps);
2306 map = rcu_dereference(
2307 dev_maps->cpu_map[raw_smp_processor_id()]);
2310 queue_index = map->queues[0];
2313 if (skb->sk && skb->sk->sk_hash)
2314 hash = skb->sk->sk_hash;
2316 hash = (__force u16) skb->protocol ^
2318 hash = jhash_1word(hash, hashrnd);
2319 queue_index = map->queues[
2320 ((u64)hash * map->len) >> 32];
2322 if (unlikely(queue_index >= dev->real_num_tx_queues))
2334 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2335 struct sk_buff *skb)
2338 const struct net_device_ops *ops = dev->netdev_ops;
2340 if (dev->real_num_tx_queues == 1)
2342 else if (ops->ndo_select_queue) {
2343 queue_index = ops->ndo_select_queue(dev, skb);
2344 queue_index = dev_cap_txqueue(dev, queue_index);
2346 struct sock *sk = skb->sk;
2347 queue_index = sk_tx_queue_get(sk);
2349 if (queue_index < 0 || skb->ooo_okay ||
2350 queue_index >= dev->real_num_tx_queues) {
2351 int old_index = queue_index;
2353 queue_index = get_xps_queue(dev, skb);
2354 if (queue_index < 0)
2355 queue_index = skb_tx_hash(dev, skb);
2357 if (queue_index != old_index && sk) {
2358 struct dst_entry *dst =
2359 rcu_dereference_check(sk->sk_dst_cache, 1);
2361 if (dst && skb_dst(skb) == dst)
2362 sk_tx_queue_set(sk, queue_index);
2367 skb_set_queue_mapping(skb, queue_index);
2368 return netdev_get_tx_queue(dev, queue_index);
2371 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2372 struct net_device *dev,
2373 struct netdev_queue *txq)
2375 spinlock_t *root_lock = qdisc_lock(q);
2379 qdisc_skb_cb(skb)->pkt_len = skb->len;
2380 qdisc_calculate_pkt_len(skb, q);
2382 * Heuristic to force contended enqueues to serialize on a
2383 * separate lock before trying to get qdisc main lock.
2384 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2385 * and dequeue packets faster.
2387 contended = qdisc_is_running(q);
2388 if (unlikely(contended))
2389 spin_lock(&q->busylock);
2391 spin_lock(root_lock);
2392 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2395 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2396 qdisc_run_begin(q)) {
2398 * This is a work-conserving queue; there are no old skbs
2399 * waiting to be sent out; and the qdisc is not running -
2400 * xmit the skb directly.
2402 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2405 qdisc_bstats_update(q, skb);
2407 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2408 if (unlikely(contended)) {
2409 spin_unlock(&q->busylock);
2416 rc = NET_XMIT_SUCCESS;
2419 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2420 if (qdisc_run_begin(q)) {
2421 if (unlikely(contended)) {
2422 spin_unlock(&q->busylock);
2428 spin_unlock(root_lock);
2429 if (unlikely(contended))
2430 spin_unlock(&q->busylock);
2434 static DEFINE_PER_CPU(int, xmit_recursion);
2435 #define RECURSION_LIMIT 10
2438 * dev_queue_xmit - transmit a buffer
2439 * @skb: buffer to transmit
2441 * Queue a buffer for transmission to a network device. The caller must
2442 * have set the device and priority and built the buffer before calling
2443 * this function. The function can be called from an interrupt.
2445 * A negative errno code is returned on a failure. A success does not
2446 * guarantee the frame will be transmitted as it may be dropped due
2447 * to congestion or traffic shaping.
2449 * -----------------------------------------------------------------------------------
2450 * I notice this method can also return errors from the queue disciplines,
2451 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2454 * Regardless of the return value, the skb is consumed, so it is currently
2455 * difficult to retry a send to this method. (You can bump the ref count
2456 * before sending to hold a reference for retry if you are careful.)
2458 * When calling this method, interrupts MUST be enabled. This is because
2459 * the BH enable code must have IRQs enabled so that it will not deadlock.
2462 int dev_queue_xmit(struct sk_buff *skb)
2464 struct net_device *dev = skb->dev;
2465 struct netdev_queue *txq;
2469 /* Disable soft irqs for various locks below. Also
2470 * stops preemption for RCU.
2474 txq = dev_pick_tx(dev, skb);
2475 q = rcu_dereference_bh(txq->qdisc);
2477 #ifdef CONFIG_NET_CLS_ACT
2478 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2480 trace_net_dev_queue(skb);
2482 rc = __dev_xmit_skb(skb, q, dev, txq);
2486 /* The device has no queue. Common case for software devices:
2487 loopback, all the sorts of tunnels...
2489 Really, it is unlikely that netif_tx_lock protection is necessary
2490 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2492 However, it is possible, that they rely on protection
2495 Check this and shot the lock. It is not prone from deadlocks.
2496 Either shot noqueue qdisc, it is even simpler 8)
2498 if (dev->flags & IFF_UP) {
2499 int cpu = smp_processor_id(); /* ok because BHs are off */
2501 if (txq->xmit_lock_owner != cpu) {
2503 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2504 goto recursion_alert;
2506 HARD_TX_LOCK(dev, txq, cpu);
2508 if (!netif_tx_queue_stopped(txq)) {
2509 __this_cpu_inc(xmit_recursion);
2510 rc = dev_hard_start_xmit(skb, dev, txq);
2511 __this_cpu_dec(xmit_recursion);
2512 if (dev_xmit_complete(rc)) {
2513 HARD_TX_UNLOCK(dev, txq);
2517 HARD_TX_UNLOCK(dev, txq);
2518 if (net_ratelimit())
2519 printk(KERN_CRIT "Virtual device %s asks to "
2520 "queue packet!\n", dev->name);
2522 /* Recursion is detected! It is possible,
2526 if (net_ratelimit())
2527 printk(KERN_CRIT "Dead loop on virtual device "
2528 "%s, fix it urgently!\n", dev->name);
2533 rcu_read_unlock_bh();
2538 rcu_read_unlock_bh();
2541 EXPORT_SYMBOL(dev_queue_xmit);
2544 /*=======================================================================
2546 =======================================================================*/
2548 int netdev_max_backlog __read_mostly = 1000;
2549 int netdev_tstamp_prequeue __read_mostly = 1;
2550 int netdev_budget __read_mostly = 300;
2551 int weight_p __read_mostly = 64; /* old backlog weight */
2553 /* Called with irq disabled */
2554 static inline void ____napi_schedule(struct softnet_data *sd,
2555 struct napi_struct *napi)
2557 list_add_tail(&napi->poll_list, &sd->poll_list);
2558 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2562 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2563 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2564 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2565 * if hash is a canonical 4-tuple hash over transport ports.
2567 void __skb_get_rxhash(struct sk_buff *skb)
2569 int nhoff, hash = 0, poff;
2570 const struct ipv6hdr *ip6;
2571 const struct iphdr *ip;
2572 const struct vlan_hdr *vlan;
2581 nhoff = skb_network_offset(skb);
2582 proto = skb->protocol;
2586 case __constant_htons(ETH_P_IP):
2588 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2591 ip = (const struct iphdr *) (skb->data + nhoff);
2592 if (ip_is_fragment(ip))
2595 ip_proto = ip->protocol;
2596 addr1 = (__force u32) ip->saddr;
2597 addr2 = (__force u32) ip->daddr;
2598 nhoff += ip->ihl * 4;
2600 case __constant_htons(ETH_P_IPV6):
2602 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2605 ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
2606 ip_proto = ip6->nexthdr;
2607 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2608 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2611 case __constant_htons(ETH_P_8021Q):
2612 if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
2614 vlan = (const struct vlan_hdr *) (skb->data + nhoff);
2615 proto = vlan->h_vlan_encapsulated_proto;
2616 nhoff += sizeof(*vlan);
2618 case __constant_htons(ETH_P_PPP_SES):
2619 if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
2621 proto = *((__be16 *) (skb->data + nhoff +
2622 sizeof(struct pppoe_hdr)));
2623 nhoff += PPPOE_SES_HLEN;
2625 case __constant_htons(PPP_IP):
2627 case __constant_htons(PPP_IPV6):
2638 if (pskb_may_pull(skb, nhoff + 16)) {
2639 u8 *h = skb->data + nhoff;
2640 __be16 flags = *(__be16 *)h;
2643 * Only look inside GRE if version zero and no
2646 if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
2647 proto = *(__be16 *)(h + 2);
2649 if (flags & GRE_CSUM)
2651 if (flags & GRE_KEY)
2653 if (flags & GRE_SEQ)
2666 poff = proto_ports_offset(ip_proto);
2669 if (pskb_may_pull(skb, nhoff + 4)) {
2670 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2671 if (ports.v16[1] < ports.v16[0])
2672 swap(ports.v16[0], ports.v16[1]);
2677 /* get a consistent hash (same value on both flow directions) */
2681 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2688 EXPORT_SYMBOL(__skb_get_rxhash);
2692 /* One global table that all flow-based protocols share. */
2693 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2694 EXPORT_SYMBOL(rps_sock_flow_table);
2696 static struct rps_dev_flow *
2697 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2698 struct rps_dev_flow *rflow, u16 next_cpu)
2700 if (next_cpu != RPS_NO_CPU) {
2701 #ifdef CONFIG_RFS_ACCEL
2702 struct netdev_rx_queue *rxqueue;
2703 struct rps_dev_flow_table *flow_table;
2704 struct rps_dev_flow *old_rflow;
2709 /* Should we steer this flow to a different hardware queue? */
2710 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2711 !(dev->features & NETIF_F_NTUPLE))
2713 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2714 if (rxq_index == skb_get_rx_queue(skb))
2717 rxqueue = dev->_rx + rxq_index;
2718 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2721 flow_id = skb->rxhash & flow_table->mask;
2722 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2723 rxq_index, flow_id);
2727 rflow = &flow_table->flows[flow_id];
2729 if (old_rflow->filter == rflow->filter)
2730 old_rflow->filter = RPS_NO_FILTER;
2734 per_cpu(softnet_data, next_cpu).input_queue_head;
2737 rflow->cpu = next_cpu;
2742 * get_rps_cpu is called from netif_receive_skb and returns the target
2743 * CPU from the RPS map of the receiving queue for a given skb.
2744 * rcu_read_lock must be held on entry.
2746 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2747 struct rps_dev_flow **rflowp)
2749 struct netdev_rx_queue *rxqueue;
2750 struct rps_map *map;
2751 struct rps_dev_flow_table *flow_table;
2752 struct rps_sock_flow_table *sock_flow_table;
2756 if (skb_rx_queue_recorded(skb)) {
2757 u16 index = skb_get_rx_queue(skb);
2758 if (unlikely(index >= dev->real_num_rx_queues)) {
2759 WARN_ONCE(dev->real_num_rx_queues > 1,
2760 "%s received packet on queue %u, but number "
2761 "of RX queues is %u\n",
2762 dev->name, index, dev->real_num_rx_queues);
2765 rxqueue = dev->_rx + index;
2769 map = rcu_dereference(rxqueue->rps_map);
2771 if (map->len == 1 &&
2772 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2773 tcpu = map->cpus[0];
2774 if (cpu_online(tcpu))
2778 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2782 skb_reset_network_header(skb);
2783 if (!skb_get_rxhash(skb))
2786 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2787 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2788 if (flow_table && sock_flow_table) {
2790 struct rps_dev_flow *rflow;
2792 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2795 next_cpu = sock_flow_table->ents[skb->rxhash &
2796 sock_flow_table->mask];
2799 * If the desired CPU (where last recvmsg was done) is
2800 * different from current CPU (one in the rx-queue flow
2801 * table entry), switch if one of the following holds:
2802 * - Current CPU is unset (equal to RPS_NO_CPU).
2803 * - Current CPU is offline.
2804 * - The current CPU's queue tail has advanced beyond the
2805 * last packet that was enqueued using this table entry.
2806 * This guarantees that all previous packets for the flow
2807 * have been dequeued, thus preserving in order delivery.
2809 if (unlikely(tcpu != next_cpu) &&
2810 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2811 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2812 rflow->last_qtail)) >= 0))
2813 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2815 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2823 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2825 if (cpu_online(tcpu)) {
2835 #ifdef CONFIG_RFS_ACCEL
2838 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2839 * @dev: Device on which the filter was set
2840 * @rxq_index: RX queue index
2841 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2842 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2844 * Drivers that implement ndo_rx_flow_steer() should periodically call
2845 * this function for each installed filter and remove the filters for
2846 * which it returns %true.
2848 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2849 u32 flow_id, u16 filter_id)
2851 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2852 struct rps_dev_flow_table *flow_table;
2853 struct rps_dev_flow *rflow;
2858 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2859 if (flow_table && flow_id <= flow_table->mask) {
2860 rflow = &flow_table->flows[flow_id];
2861 cpu = ACCESS_ONCE(rflow->cpu);
2862 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2863 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2864 rflow->last_qtail) <
2865 (int)(10 * flow_table->mask)))
2871 EXPORT_SYMBOL(rps_may_expire_flow);
2873 #endif /* CONFIG_RFS_ACCEL */
2875 /* Called from hardirq (IPI) context */
2876 static void rps_trigger_softirq(void *data)
2878 struct softnet_data *sd = data;
2880 ____napi_schedule(sd, &sd->backlog);
2884 #endif /* CONFIG_RPS */
2887 * Check if this softnet_data structure is another cpu one
2888 * If yes, queue it to our IPI list and return 1
2891 static int rps_ipi_queued(struct softnet_data *sd)
2894 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2897 sd->rps_ipi_next = mysd->rps_ipi_list;
2898 mysd->rps_ipi_list = sd;
2900 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2903 #endif /* CONFIG_RPS */
2908 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2909 * queue (may be a remote CPU queue).
2911 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2912 unsigned int *qtail)
2914 struct softnet_data *sd;
2915 unsigned long flags;
2917 sd = &per_cpu(softnet_data, cpu);
2919 local_irq_save(flags);
2922 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2923 if (skb_queue_len(&sd->input_pkt_queue)) {
2925 __skb_queue_tail(&sd->input_pkt_queue, skb);
2926 input_queue_tail_incr_save(sd, qtail);
2928 local_irq_restore(flags);
2929 return NET_RX_SUCCESS;
2932 /* Schedule NAPI for backlog device
2933 * We can use non atomic operation since we own the queue lock
2935 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2936 if (!rps_ipi_queued(sd))
2937 ____napi_schedule(sd, &sd->backlog);
2945 local_irq_restore(flags);
2947 atomic_long_inc(&skb->dev->rx_dropped);
2953 * netif_rx - post buffer to the network code
2954 * @skb: buffer to post
2956 * This function receives a packet from a device driver and queues it for
2957 * the upper (protocol) levels to process. It always succeeds. The buffer
2958 * may be dropped during processing for congestion control or by the
2962 * NET_RX_SUCCESS (no congestion)
2963 * NET_RX_DROP (packet was dropped)
2967 int netif_rx(struct sk_buff *skb)
2971 /* if netpoll wants it, pretend we never saw it */
2972 if (netpoll_rx(skb))
2975 if (netdev_tstamp_prequeue)
2976 net_timestamp_check(skb);
2978 trace_netif_rx(skb);
2981 struct rps_dev_flow voidflow, *rflow = &voidflow;
2987 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2989 cpu = smp_processor_id();
2991 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2999 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3005 EXPORT_SYMBOL(netif_rx);
3007 int netif_rx_ni(struct sk_buff *skb)
3012 err = netif_rx(skb);
3013 if (local_softirq_pending())
3019 EXPORT_SYMBOL(netif_rx_ni);
3021 static void net_tx_action(struct softirq_action *h)
3023 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3025 if (sd->completion_queue) {
3026 struct sk_buff *clist;
3028 local_irq_disable();
3029 clist = sd->completion_queue;
3030 sd->completion_queue = NULL;
3034 struct sk_buff *skb = clist;
3035 clist = clist->next;
3037 WARN_ON(atomic_read(&skb->users));
3038 trace_kfree_skb(skb, net_tx_action);
3043 if (sd->output_queue) {
3046 local_irq_disable();
3047 head = sd->output_queue;
3048 sd->output_queue = NULL;
3049 sd->output_queue_tailp = &sd->output_queue;
3053 struct Qdisc *q = head;
3054 spinlock_t *root_lock;
3056 head = head->next_sched;
3058 root_lock = qdisc_lock(q);
3059 if (spin_trylock(root_lock)) {
3060 smp_mb__before_clear_bit();
3061 clear_bit(__QDISC_STATE_SCHED,
3064 spin_unlock(root_lock);
3066 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3068 __netif_reschedule(q);
3070 smp_mb__before_clear_bit();
3071 clear_bit(__QDISC_STATE_SCHED,
3079 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3080 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3081 /* This hook is defined here for ATM LANE */
3082 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3083 unsigned char *addr) __read_mostly;
3084 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3087 #ifdef CONFIG_NET_CLS_ACT
3088 /* TODO: Maybe we should just force sch_ingress to be compiled in
3089 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3090 * a compare and 2 stores extra right now if we dont have it on
3091 * but have CONFIG_NET_CLS_ACT
3092 * NOTE: This doesn't stop any functionality; if you dont have
3093 * the ingress scheduler, you just can't add policies on ingress.
3096 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3098 struct net_device *dev = skb->dev;
3099 u32 ttl = G_TC_RTTL(skb->tc_verd);
3100 int result = TC_ACT_OK;
3103 if (unlikely(MAX_RED_LOOP < ttl++)) {
3104 if (net_ratelimit())
3105 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3106 skb->skb_iif, dev->ifindex);
3110 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3111 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3114 if (q != &noop_qdisc) {
3115 spin_lock(qdisc_lock(q));
3116 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3117 result = qdisc_enqueue_root(skb, q);
3118 spin_unlock(qdisc_lock(q));
3124 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3125 struct packet_type **pt_prev,
3126 int *ret, struct net_device *orig_dev)
3128 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3130 if (!rxq || rxq->qdisc == &noop_qdisc)
3134 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3138 switch (ing_filter(skb, rxq)) {
3152 * netdev_rx_handler_register - register receive handler
3153 * @dev: device to register a handler for
3154 * @rx_handler: receive handler to register
3155 * @rx_handler_data: data pointer that is used by rx handler
3157 * Register a receive hander for a device. This handler will then be
3158 * called from __netif_receive_skb. A negative errno code is returned
3161 * The caller must hold the rtnl_mutex.
3163 * For a general description of rx_handler, see enum rx_handler_result.
3165 int netdev_rx_handler_register(struct net_device *dev,
3166 rx_handler_func_t *rx_handler,
3167 void *rx_handler_data)
3171 if (dev->rx_handler)
3174 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3175 rcu_assign_pointer(dev->rx_handler, rx_handler);
3179 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3182 * netdev_rx_handler_unregister - unregister receive handler
3183 * @dev: device to unregister a handler from
3185 * Unregister a receive hander from a device.
3187 * The caller must hold the rtnl_mutex.
3189 void netdev_rx_handler_unregister(struct net_device *dev)
3193 RCU_INIT_POINTER(dev->rx_handler, NULL);
3194 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3196 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3198 static int __netif_receive_skb(struct sk_buff *skb)
3200 struct packet_type *ptype, *pt_prev;
3201 rx_handler_func_t *rx_handler;
3202 struct net_device *orig_dev;
3203 struct net_device *null_or_dev;
3204 bool deliver_exact = false;
3205 int ret = NET_RX_DROP;
3208 if (!netdev_tstamp_prequeue)
3209 net_timestamp_check(skb);
3211 trace_netif_receive_skb(skb);
3213 /* if we've gotten here through NAPI, check netpoll */
3214 if (netpoll_receive_skb(skb))
3218 skb->skb_iif = skb->dev->ifindex;
3219 orig_dev = skb->dev;
3221 skb_reset_network_header(skb);
3222 skb_reset_transport_header(skb);
3223 skb_reset_mac_len(skb);
3231 __this_cpu_inc(softnet_data.processed);
3233 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3234 skb = vlan_untag(skb);
3239 #ifdef CONFIG_NET_CLS_ACT
3240 if (skb->tc_verd & TC_NCLS) {
3241 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3246 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3247 if (!ptype->dev || ptype->dev == skb->dev) {
3249 ret = deliver_skb(skb, pt_prev, orig_dev);
3254 #ifdef CONFIG_NET_CLS_ACT
3255 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3261 rx_handler = rcu_dereference(skb->dev->rx_handler);
3262 if (vlan_tx_tag_present(skb)) {
3264 ret = deliver_skb(skb, pt_prev, orig_dev);
3267 if (vlan_do_receive(&skb, !rx_handler))
3269 else if (unlikely(!skb))
3275 ret = deliver_skb(skb, pt_prev, orig_dev);
3278 switch (rx_handler(&skb)) {
3279 case RX_HANDLER_CONSUMED:
3281 case RX_HANDLER_ANOTHER:
3283 case RX_HANDLER_EXACT:
3284 deliver_exact = true;
3285 case RX_HANDLER_PASS:
3292 /* deliver only exact match when indicated */
3293 null_or_dev = deliver_exact ? skb->dev : NULL;
3295 type = skb->protocol;
3296 list_for_each_entry_rcu(ptype,
3297 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3298 if (ptype->type == type &&
3299 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3300 ptype->dev == orig_dev)) {
3302 ret = deliver_skb(skb, pt_prev, orig_dev);
3308 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3310 atomic_long_inc(&skb->dev->rx_dropped);
3312 /* Jamal, now you will not able to escape explaining
3313 * me how you were going to use this. :-)
3324 * netif_receive_skb - process receive buffer from network
3325 * @skb: buffer to process
3327 * netif_receive_skb() is the main receive data processing function.
3328 * It always succeeds. The buffer may be dropped during processing
3329 * for congestion control or by the protocol layers.
3331 * This function may only be called from softirq context and interrupts
3332 * should be enabled.
3334 * Return values (usually ignored):
3335 * NET_RX_SUCCESS: no congestion
3336 * NET_RX_DROP: packet was dropped
3338 int netif_receive_skb(struct sk_buff *skb)
3340 if (netdev_tstamp_prequeue)
3341 net_timestamp_check(skb);
3343 if (skb_defer_rx_timestamp(skb))
3344 return NET_RX_SUCCESS;
3348 struct rps_dev_flow voidflow, *rflow = &voidflow;
3353 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3356 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3360 ret = __netif_receive_skb(skb);
3366 return __netif_receive_skb(skb);
3369 EXPORT_SYMBOL(netif_receive_skb);
3371 /* Network device is going away, flush any packets still pending
3372 * Called with irqs disabled.
3374 static void flush_backlog(void *arg)
3376 struct net_device *dev = arg;
3377 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3378 struct sk_buff *skb, *tmp;
3381 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3382 if (skb->dev == dev) {
3383 __skb_unlink(skb, &sd->input_pkt_queue);
3385 input_queue_head_incr(sd);
3390 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3391 if (skb->dev == dev) {
3392 __skb_unlink(skb, &sd->process_queue);
3394 input_queue_head_incr(sd);
3399 static int napi_gro_complete(struct sk_buff *skb)
3401 struct packet_type *ptype;
3402 __be16 type = skb->protocol;
3403 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3406 if (NAPI_GRO_CB(skb)->count == 1) {
3407 skb_shinfo(skb)->gso_size = 0;
3412 list_for_each_entry_rcu(ptype, head, list) {
3413 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3416 err = ptype->gro_complete(skb);
3422 WARN_ON(&ptype->list == head);
3424 return NET_RX_SUCCESS;
3428 return netif_receive_skb(skb);
3431 inline void napi_gro_flush(struct napi_struct *napi)
3433 struct sk_buff *skb, *next;
3435 for (skb = napi->gro_list; skb; skb = next) {
3438 napi_gro_complete(skb);
3441 napi->gro_count = 0;
3442 napi->gro_list = NULL;
3444 EXPORT_SYMBOL(napi_gro_flush);
3446 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3448 struct sk_buff **pp = NULL;
3449 struct packet_type *ptype;
3450 __be16 type = skb->protocol;
3451 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3454 enum gro_result ret;
3456 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3459 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3463 list_for_each_entry_rcu(ptype, head, list) {
3464 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3467 skb_set_network_header(skb, skb_gro_offset(skb));
3468 mac_len = skb->network_header - skb->mac_header;
3469 skb->mac_len = mac_len;
3470 NAPI_GRO_CB(skb)->same_flow = 0;
3471 NAPI_GRO_CB(skb)->flush = 0;
3472 NAPI_GRO_CB(skb)->free = 0;
3474 pp = ptype->gro_receive(&napi->gro_list, skb);
3479 if (&ptype->list == head)
3482 same_flow = NAPI_GRO_CB(skb)->same_flow;
3483 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3486 struct sk_buff *nskb = *pp;
3490 napi_gro_complete(nskb);
3497 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3501 NAPI_GRO_CB(skb)->count = 1;
3502 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3503 skb->next = napi->gro_list;
3504 napi->gro_list = skb;
3508 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3509 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3511 BUG_ON(skb->end - skb->tail < grow);
3513 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3516 skb->data_len -= grow;
3518 skb_shinfo(skb)->frags[0].page_offset += grow;
3519 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3521 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3522 skb_frag_unref(skb, 0);
3523 memmove(skb_shinfo(skb)->frags,
3524 skb_shinfo(skb)->frags + 1,
3525 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3536 EXPORT_SYMBOL(dev_gro_receive);
3538 static inline gro_result_t
3539 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3542 unsigned int maclen = skb->dev->hard_header_len;
3544 for (p = napi->gro_list; p; p = p->next) {
3545 unsigned long diffs;
3547 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3548 diffs |= p->vlan_tci ^ skb->vlan_tci;
3549 if (maclen == ETH_HLEN)
3550 diffs |= compare_ether_header(skb_mac_header(p),
3551 skb_gro_mac_header(skb));
3553 diffs = memcmp(skb_mac_header(p),
3554 skb_gro_mac_header(skb),
3556 NAPI_GRO_CB(p)->same_flow = !diffs;
3557 NAPI_GRO_CB(p)->flush = 0;
3560 return dev_gro_receive(napi, skb);
3563 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3567 if (netif_receive_skb(skb))
3572 case GRO_MERGED_FREE:
3583 EXPORT_SYMBOL(napi_skb_finish);
3585 void skb_gro_reset_offset(struct sk_buff *skb)
3587 NAPI_GRO_CB(skb)->data_offset = 0;
3588 NAPI_GRO_CB(skb)->frag0 = NULL;
3589 NAPI_GRO_CB(skb)->frag0_len = 0;
3591 if (skb->mac_header == skb->tail &&
3592 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3593 NAPI_GRO_CB(skb)->frag0 =
3594 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3595 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3598 EXPORT_SYMBOL(skb_gro_reset_offset);
3600 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3602 skb_gro_reset_offset(skb);
3604 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3606 EXPORT_SYMBOL(napi_gro_receive);
3608 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3610 __skb_pull(skb, skb_headlen(skb));
3611 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3612 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3614 skb->dev = napi->dev;
3620 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3622 struct sk_buff *skb = napi->skb;
3625 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3631 EXPORT_SYMBOL(napi_get_frags);
3633 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3639 skb->protocol = eth_type_trans(skb, skb->dev);
3641 if (ret == GRO_HELD)
3642 skb_gro_pull(skb, -ETH_HLEN);
3643 else if (netif_receive_skb(skb))
3648 case GRO_MERGED_FREE:
3649 napi_reuse_skb(napi, skb);
3658 EXPORT_SYMBOL(napi_frags_finish);
3660 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3662 struct sk_buff *skb = napi->skb;
3669 skb_reset_mac_header(skb);
3670 skb_gro_reset_offset(skb);
3672 off = skb_gro_offset(skb);
3673 hlen = off + sizeof(*eth);
3674 eth = skb_gro_header_fast(skb, off);
3675 if (skb_gro_header_hard(skb, hlen)) {
3676 eth = skb_gro_header_slow(skb, hlen, off);
3677 if (unlikely(!eth)) {
3678 napi_reuse_skb(napi, skb);
3684 skb_gro_pull(skb, sizeof(*eth));
3687 * This works because the only protocols we care about don't require
3688 * special handling. We'll fix it up properly at the end.
3690 skb->protocol = eth->h_proto;
3695 EXPORT_SYMBOL(napi_frags_skb);
3697 gro_result_t napi_gro_frags(struct napi_struct *napi)
3699 struct sk_buff *skb = napi_frags_skb(napi);
3704 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3706 EXPORT_SYMBOL(napi_gro_frags);
3709 * net_rps_action sends any pending IPI's for rps.
3710 * Note: called with local irq disabled, but exits with local irq enabled.
3712 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3715 struct softnet_data *remsd = sd->rps_ipi_list;
3718 sd->rps_ipi_list = NULL;
3722 /* Send pending IPI's to kick RPS processing on remote cpus. */
3724 struct softnet_data *next = remsd->rps_ipi_next;
3726 if (cpu_online(remsd->cpu))
3727 __smp_call_function_single(remsd->cpu,
3736 static int process_backlog(struct napi_struct *napi, int quota)
3739 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3742 /* Check if we have pending ipi, its better to send them now,
3743 * not waiting net_rx_action() end.
3745 if (sd->rps_ipi_list) {
3746 local_irq_disable();
3747 net_rps_action_and_irq_enable(sd);
3750 napi->weight = weight_p;
3751 local_irq_disable();
3752 while (work < quota) {
3753 struct sk_buff *skb;
3756 while ((skb = __skb_dequeue(&sd->process_queue))) {
3758 __netif_receive_skb(skb);
3759 local_irq_disable();
3760 input_queue_head_incr(sd);
3761 if (++work >= quota) {
3768 qlen = skb_queue_len(&sd->input_pkt_queue);
3770 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3771 &sd->process_queue);
3773 if (qlen < quota - work) {
3775 * Inline a custom version of __napi_complete().
3776 * only current cpu owns and manipulates this napi,
3777 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3778 * we can use a plain write instead of clear_bit(),
3779 * and we dont need an smp_mb() memory barrier.
3781 list_del(&napi->poll_list);
3784 quota = work + qlen;
3794 * __napi_schedule - schedule for receive
3795 * @n: entry to schedule
3797 * The entry's receive function will be scheduled to run
3799 void __napi_schedule(struct napi_struct *n)
3801 unsigned long flags;
3803 local_irq_save(flags);
3804 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3805 local_irq_restore(flags);
3807 EXPORT_SYMBOL(__napi_schedule);
3809 void __napi_complete(struct napi_struct *n)
3811 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3812 BUG_ON(n->gro_list);
3814 list_del(&n->poll_list);
3815 smp_mb__before_clear_bit();
3816 clear_bit(NAPI_STATE_SCHED, &n->state);
3818 EXPORT_SYMBOL(__napi_complete);
3820 void napi_complete(struct napi_struct *n)
3822 unsigned long flags;
3825 * don't let napi dequeue from the cpu poll list
3826 * just in case its running on a different cpu
3828 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3832 local_irq_save(flags);
3834 local_irq_restore(flags);
3836 EXPORT_SYMBOL(napi_complete);
3838 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3839 int (*poll)(struct napi_struct *, int), int weight)
3841 INIT_LIST_HEAD(&napi->poll_list);
3842 napi->gro_count = 0;
3843 napi->gro_list = NULL;
3846 napi->weight = weight;
3847 list_add(&napi->dev_list, &dev->napi_list);
3849 #ifdef CONFIG_NETPOLL
3850 spin_lock_init(&napi->poll_lock);
3851 napi->poll_owner = -1;
3853 set_bit(NAPI_STATE_SCHED, &napi->state);
3855 EXPORT_SYMBOL(netif_napi_add);
3857 void netif_napi_del(struct napi_struct *napi)
3859 struct sk_buff *skb, *next;
3861 list_del_init(&napi->dev_list);
3862 napi_free_frags(napi);
3864 for (skb = napi->gro_list; skb; skb = next) {
3870 napi->gro_list = NULL;
3871 napi->gro_count = 0;
3873 EXPORT_SYMBOL(netif_napi_del);
3875 static void net_rx_action(struct softirq_action *h)
3877 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3878 unsigned long time_limit = jiffies + 2;
3879 int budget = netdev_budget;
3882 local_irq_disable();
3884 while (!list_empty(&sd->poll_list)) {
3885 struct napi_struct *n;
3888 /* If softirq window is exhuasted then punt.
3889 * Allow this to run for 2 jiffies since which will allow
3890 * an average latency of 1.5/HZ.
3892 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3897 /* Even though interrupts have been re-enabled, this
3898 * access is safe because interrupts can only add new
3899 * entries to the tail of this list, and only ->poll()
3900 * calls can remove this head entry from the list.
3902 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3904 have = netpoll_poll_lock(n);
3908 /* This NAPI_STATE_SCHED test is for avoiding a race
3909 * with netpoll's poll_napi(). Only the entity which
3910 * obtains the lock and sees NAPI_STATE_SCHED set will
3911 * actually make the ->poll() call. Therefore we avoid
3912 * accidentally calling ->poll() when NAPI is not scheduled.
3915 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3916 work = n->poll(n, weight);
3920 WARN_ON_ONCE(work > weight);
3924 local_irq_disable();
3926 /* Drivers must not modify the NAPI state if they
3927 * consume the entire weight. In such cases this code
3928 * still "owns" the NAPI instance and therefore can
3929 * move the instance around on the list at-will.
3931 if (unlikely(work == weight)) {
3932 if (unlikely(napi_disable_pending(n))) {
3935 local_irq_disable();
3937 list_move_tail(&n->poll_list, &sd->poll_list);
3940 netpoll_poll_unlock(have);
3943 net_rps_action_and_irq_enable(sd);
3945 #ifdef CONFIG_NET_DMA
3947 * There may not be any more sk_buffs coming right now, so push
3948 * any pending DMA copies to hardware
3950 dma_issue_pending_all();
3957 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3961 static gifconf_func_t *gifconf_list[NPROTO];
3964 * register_gifconf - register a SIOCGIF handler
3965 * @family: Address family
3966 * @gifconf: Function handler
3968 * Register protocol dependent address dumping routines. The handler
3969 * that is passed must not be freed or reused until it has been replaced
3970 * by another handler.
3972 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3974 if (family >= NPROTO)
3976 gifconf_list[family] = gifconf;
3979 EXPORT_SYMBOL(register_gifconf);
3983 * Map an interface index to its name (SIOCGIFNAME)
3987 * We need this ioctl for efficient implementation of the
3988 * if_indextoname() function required by the IPv6 API. Without
3989 * it, we would have to search all the interfaces to find a
3993 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3995 struct net_device *dev;
3999 * Fetch the caller's info block.
4002 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4006 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4012 strcpy(ifr.ifr_name, dev->name);
4015 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4021 * Perform a SIOCGIFCONF call. This structure will change
4022 * size eventually, and there is nothing I can do about it.
4023 * Thus we will need a 'compatibility mode'.
4026 static int dev_ifconf(struct net *net, char __user *arg)
4029 struct net_device *dev;
4036 * Fetch the caller's info block.
4039 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4046 * Loop over the interfaces, and write an info block for each.
4050 for_each_netdev(net, dev) {
4051 for (i = 0; i < NPROTO; i++) {
4052 if (gifconf_list[i]) {
4055 done = gifconf_list[i](dev, NULL, 0);
4057 done = gifconf_list[i](dev, pos + total,
4067 * All done. Write the updated control block back to the caller.
4069 ifc.ifc_len = total;
4072 * Both BSD and Solaris return 0 here, so we do too.
4074 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4077 #ifdef CONFIG_PROC_FS
4079 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4081 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4082 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4083 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4085 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4087 struct net *net = seq_file_net(seq);
4088 struct net_device *dev;
4089 struct hlist_node *p;
4090 struct hlist_head *h;
4091 unsigned int count = 0, offset = get_offset(*pos);
4093 h = &net->dev_name_head[get_bucket(*pos)];
4094 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4095 if (++count == offset)
4102 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4104 struct net_device *dev;
4105 unsigned int bucket;
4108 dev = dev_from_same_bucket(seq, pos);
4112 bucket = get_bucket(*pos) + 1;
4113 *pos = set_bucket_offset(bucket, 1);
4114 } while (bucket < NETDEV_HASHENTRIES);
4120 * This is invoked by the /proc filesystem handler to display a device
4123 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4128 return SEQ_START_TOKEN;
4130 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4133 return dev_from_bucket(seq, pos);
4136 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4139 return dev_from_bucket(seq, pos);
4142 void dev_seq_stop(struct seq_file *seq, void *v)
4148 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4150 struct rtnl_link_stats64 temp;
4151 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4153 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4154 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4155 dev->name, stats->rx_bytes, stats->rx_packets,
4157 stats->rx_dropped + stats->rx_missed_errors,
4158 stats->rx_fifo_errors,
4159 stats->rx_length_errors + stats->rx_over_errors +
4160 stats->rx_crc_errors + stats->rx_frame_errors,
4161 stats->rx_compressed, stats->multicast,
4162 stats->tx_bytes, stats->tx_packets,
4163 stats->tx_errors, stats->tx_dropped,
4164 stats->tx_fifo_errors, stats->collisions,
4165 stats->tx_carrier_errors +
4166 stats->tx_aborted_errors +
4167 stats->tx_window_errors +
4168 stats->tx_heartbeat_errors,
4169 stats->tx_compressed);
4173 * Called from the PROCfs module. This now uses the new arbitrary sized
4174 * /proc/net interface to create /proc/net/dev
4176 static int dev_seq_show(struct seq_file *seq, void *v)
4178 if (v == SEQ_START_TOKEN)
4179 seq_puts(seq, "Inter-| Receive "
4181 " face |bytes packets errs drop fifo frame "
4182 "compressed multicast|bytes packets errs "
4183 "drop fifo colls carrier compressed\n");
4185 dev_seq_printf_stats(seq, v);
4189 static struct softnet_data *softnet_get_online(loff_t *pos)
4191 struct softnet_data *sd = NULL;
4193 while (*pos < nr_cpu_ids)
4194 if (cpu_online(*pos)) {
4195 sd = &per_cpu(softnet_data, *pos);
4202 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4204 return softnet_get_online(pos);
4207 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4210 return softnet_get_online(pos);
4213 static void softnet_seq_stop(struct seq_file *seq, void *v)
4217 static int softnet_seq_show(struct seq_file *seq, void *v)
4219 struct softnet_data *sd = v;
4221 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4222 sd->processed, sd->dropped, sd->time_squeeze, 0,
4223 0, 0, 0, 0, /* was fastroute */
4224 sd->cpu_collision, sd->received_rps);
4228 static const struct seq_operations dev_seq_ops = {
4229 .start = dev_seq_start,
4230 .next = dev_seq_next,
4231 .stop = dev_seq_stop,
4232 .show = dev_seq_show,
4235 static int dev_seq_open(struct inode *inode, struct file *file)
4237 return seq_open_net(inode, file, &dev_seq_ops,
4238 sizeof(struct seq_net_private));
4241 static const struct file_operations dev_seq_fops = {
4242 .owner = THIS_MODULE,
4243 .open = dev_seq_open,
4245 .llseek = seq_lseek,
4246 .release = seq_release_net,
4249 static const struct seq_operations softnet_seq_ops = {
4250 .start = softnet_seq_start,
4251 .next = softnet_seq_next,
4252 .stop = softnet_seq_stop,
4253 .show = softnet_seq_show,
4256 static int softnet_seq_open(struct inode *inode, struct file *file)
4258 return seq_open(file, &softnet_seq_ops);
4261 static const struct file_operations softnet_seq_fops = {
4262 .owner = THIS_MODULE,
4263 .open = softnet_seq_open,
4265 .llseek = seq_lseek,
4266 .release = seq_release,
4269 static void *ptype_get_idx(loff_t pos)
4271 struct packet_type *pt = NULL;
4275 list_for_each_entry_rcu(pt, &ptype_all, list) {
4281 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4282 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4291 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4295 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4298 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4300 struct packet_type *pt;
4301 struct list_head *nxt;
4305 if (v == SEQ_START_TOKEN)
4306 return ptype_get_idx(0);
4309 nxt = pt->list.next;
4310 if (pt->type == htons(ETH_P_ALL)) {
4311 if (nxt != &ptype_all)
4314 nxt = ptype_base[0].next;
4316 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4318 while (nxt == &ptype_base[hash]) {
4319 if (++hash >= PTYPE_HASH_SIZE)
4321 nxt = ptype_base[hash].next;
4324 return list_entry(nxt, struct packet_type, list);
4327 static void ptype_seq_stop(struct seq_file *seq, void *v)
4333 static int ptype_seq_show(struct seq_file *seq, void *v)
4335 struct packet_type *pt = v;
4337 if (v == SEQ_START_TOKEN)
4338 seq_puts(seq, "Type Device Function\n");
4339 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4340 if (pt->type == htons(ETH_P_ALL))
4341 seq_puts(seq, "ALL ");
4343 seq_printf(seq, "%04x", ntohs(pt->type));
4345 seq_printf(seq, " %-8s %pF\n",
4346 pt->dev ? pt->dev->name : "", pt->func);
4352 static const struct seq_operations ptype_seq_ops = {
4353 .start = ptype_seq_start,
4354 .next = ptype_seq_next,
4355 .stop = ptype_seq_stop,
4356 .show = ptype_seq_show,
4359 static int ptype_seq_open(struct inode *inode, struct file *file)
4361 return seq_open_net(inode, file, &ptype_seq_ops,
4362 sizeof(struct seq_net_private));
4365 static const struct file_operations ptype_seq_fops = {
4366 .owner = THIS_MODULE,
4367 .open = ptype_seq_open,
4369 .llseek = seq_lseek,
4370 .release = seq_release_net,
4374 static int __net_init dev_proc_net_init(struct net *net)
4378 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4380 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4382 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4385 if (wext_proc_init(net))
4391 proc_net_remove(net, "ptype");
4393 proc_net_remove(net, "softnet_stat");
4395 proc_net_remove(net, "dev");
4399 static void __net_exit dev_proc_net_exit(struct net *net)
4401 wext_proc_exit(net);
4403 proc_net_remove(net, "ptype");
4404 proc_net_remove(net, "softnet_stat");
4405 proc_net_remove(net, "dev");
4408 static struct pernet_operations __net_initdata dev_proc_ops = {
4409 .init = dev_proc_net_init,
4410 .exit = dev_proc_net_exit,
4413 static int __init dev_proc_init(void)
4415 return register_pernet_subsys(&dev_proc_ops);
4418 #define dev_proc_init() 0
4419 #endif /* CONFIG_PROC_FS */
4423 * netdev_set_master - set up master pointer
4424 * @slave: slave device
4425 * @master: new master device
4427 * Changes the master device of the slave. Pass %NULL to break the
4428 * bonding. The caller must hold the RTNL semaphore. On a failure
4429 * a negative errno code is returned. On success the reference counts
4430 * are adjusted and the function returns zero.
4432 int netdev_set_master(struct net_device *slave, struct net_device *master)
4434 struct net_device *old = slave->master;
4444 slave->master = master;
4450 EXPORT_SYMBOL(netdev_set_master);
4453 * netdev_set_bond_master - set up bonding master/slave pair
4454 * @slave: slave device
4455 * @master: new master device
4457 * Changes the master device of the slave. Pass %NULL to break the
4458 * bonding. The caller must hold the RTNL semaphore. On a failure
4459 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4460 * to the routing socket and the function returns zero.
4462 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4468 err = netdev_set_master(slave, master);
4472 slave->flags |= IFF_SLAVE;
4474 slave->flags &= ~IFF_SLAVE;
4476 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4479 EXPORT_SYMBOL(netdev_set_bond_master);
4481 static void dev_change_rx_flags(struct net_device *dev, int flags)
4483 const struct net_device_ops *ops = dev->netdev_ops;
4485 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4486 ops->ndo_change_rx_flags(dev, flags);
4489 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4491 unsigned short old_flags = dev->flags;
4497 dev->flags |= IFF_PROMISC;
4498 dev->promiscuity += inc;
4499 if (dev->promiscuity == 0) {
4502 * If inc causes overflow, untouch promisc and return error.
4505 dev->flags &= ~IFF_PROMISC;
4507 dev->promiscuity -= inc;
4508 printk(KERN_WARNING "%s: promiscuity touches roof, "
4509 "set promiscuity failed, promiscuity feature "
4510 "of device might be broken.\n", dev->name);
4514 if (dev->flags != old_flags) {
4515 printk(KERN_INFO "device %s %s promiscuous mode\n",
4516 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4518 if (audit_enabled) {
4519 current_uid_gid(&uid, &gid);
4520 audit_log(current->audit_context, GFP_ATOMIC,
4521 AUDIT_ANOM_PROMISCUOUS,
4522 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4523 dev->name, (dev->flags & IFF_PROMISC),
4524 (old_flags & IFF_PROMISC),
4525 audit_get_loginuid(current),
4527 audit_get_sessionid(current));
4530 dev_change_rx_flags(dev, IFF_PROMISC);
4536 * dev_set_promiscuity - update promiscuity count on a device
4540 * Add or remove promiscuity from a device. While the count in the device
4541 * remains above zero the interface remains promiscuous. Once it hits zero
4542 * the device reverts back to normal filtering operation. A negative inc
4543 * value is used to drop promiscuity on the device.
4544 * Return 0 if successful or a negative errno code on error.
4546 int dev_set_promiscuity(struct net_device *dev, int inc)
4548 unsigned short old_flags = dev->flags;
4551 err = __dev_set_promiscuity(dev, inc);
4554 if (dev->flags != old_flags)
4555 dev_set_rx_mode(dev);
4558 EXPORT_SYMBOL(dev_set_promiscuity);
4561 * dev_set_allmulti - update allmulti count on a device
4565 * Add or remove reception of all multicast frames to a device. While the
4566 * count in the device remains above zero the interface remains listening
4567 * to all interfaces. Once it hits zero the device reverts back to normal
4568 * filtering operation. A negative @inc value is used to drop the counter
4569 * when releasing a resource needing all multicasts.
4570 * Return 0 if successful or a negative errno code on error.
4573 int dev_set_allmulti(struct net_device *dev, int inc)
4575 unsigned short old_flags = dev->flags;
4579 dev->flags |= IFF_ALLMULTI;
4580 dev->allmulti += inc;
4581 if (dev->allmulti == 0) {
4584 * If inc causes overflow, untouch allmulti and return error.
4587 dev->flags &= ~IFF_ALLMULTI;
4589 dev->allmulti -= inc;
4590 printk(KERN_WARNING "%s: allmulti touches roof, "
4591 "set allmulti failed, allmulti feature of "
4592 "device might be broken.\n", dev->name);
4596 if (dev->flags ^ old_flags) {
4597 dev_change_rx_flags(dev, IFF_ALLMULTI);
4598 dev_set_rx_mode(dev);
4602 EXPORT_SYMBOL(dev_set_allmulti);
4605 * Upload unicast and multicast address lists to device and
4606 * configure RX filtering. When the device doesn't support unicast
4607 * filtering it is put in promiscuous mode while unicast addresses
4610 void __dev_set_rx_mode(struct net_device *dev)
4612 const struct net_device_ops *ops = dev->netdev_ops;
4614 /* dev_open will call this function so the list will stay sane. */
4615 if (!(dev->flags&IFF_UP))
4618 if (!netif_device_present(dev))
4621 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4622 /* Unicast addresses changes may only happen under the rtnl,
4623 * therefore calling __dev_set_promiscuity here is safe.
4625 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4626 __dev_set_promiscuity(dev, 1);
4627 dev->uc_promisc = true;
4628 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4629 __dev_set_promiscuity(dev, -1);
4630 dev->uc_promisc = false;
4634 if (ops->ndo_set_rx_mode)
4635 ops->ndo_set_rx_mode(dev);
4638 void dev_set_rx_mode(struct net_device *dev)
4640 netif_addr_lock_bh(dev);
4641 __dev_set_rx_mode(dev);
4642 netif_addr_unlock_bh(dev);
4646 * dev_get_flags - get flags reported to userspace
4649 * Get the combination of flag bits exported through APIs to userspace.
4651 unsigned dev_get_flags(const struct net_device *dev)
4655 flags = (dev->flags & ~(IFF_PROMISC |
4660 (dev->gflags & (IFF_PROMISC |
4663 if (netif_running(dev)) {
4664 if (netif_oper_up(dev))
4665 flags |= IFF_RUNNING;
4666 if (netif_carrier_ok(dev))
4667 flags |= IFF_LOWER_UP;
4668 if (netif_dormant(dev))
4669 flags |= IFF_DORMANT;
4674 EXPORT_SYMBOL(dev_get_flags);
4676 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4678 int old_flags = dev->flags;
4684 * Set the flags on our device.
4687 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4688 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4690 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4694 * Load in the correct multicast list now the flags have changed.
4697 if ((old_flags ^ flags) & IFF_MULTICAST)
4698 dev_change_rx_flags(dev, IFF_MULTICAST);
4700 dev_set_rx_mode(dev);
4703 * Have we downed the interface. We handle IFF_UP ourselves
4704 * according to user attempts to set it, rather than blindly
4709 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4710 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4713 dev_set_rx_mode(dev);
4716 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4717 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4719 dev->gflags ^= IFF_PROMISC;
4720 dev_set_promiscuity(dev, inc);
4723 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4724 is important. Some (broken) drivers set IFF_PROMISC, when
4725 IFF_ALLMULTI is requested not asking us and not reporting.
4727 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4728 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4730 dev->gflags ^= IFF_ALLMULTI;
4731 dev_set_allmulti(dev, inc);
4737 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4739 unsigned int changes = dev->flags ^ old_flags;
4741 if (changes & IFF_UP) {
4742 if (dev->flags & IFF_UP)
4743 call_netdevice_notifiers(NETDEV_UP, dev);
4745 call_netdevice_notifiers(NETDEV_DOWN, dev);
4748 if (dev->flags & IFF_UP &&
4749 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4750 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4754 * dev_change_flags - change device settings
4756 * @flags: device state flags
4758 * Change settings on device based state flags. The flags are
4759 * in the userspace exported format.
4761 int dev_change_flags(struct net_device *dev, unsigned flags)
4764 int old_flags = dev->flags;
4766 ret = __dev_change_flags(dev, flags);
4770 changes = old_flags ^ dev->flags;
4772 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4774 __dev_notify_flags(dev, old_flags);
4777 EXPORT_SYMBOL(dev_change_flags);
4780 * dev_set_mtu - Change maximum transfer unit
4782 * @new_mtu: new transfer unit
4784 * Change the maximum transfer size of the network device.
4786 int dev_set_mtu(struct net_device *dev, int new_mtu)
4788 const struct net_device_ops *ops = dev->netdev_ops;
4791 if (new_mtu == dev->mtu)
4794 /* MTU must be positive. */
4798 if (!netif_device_present(dev))
4802 if (ops->ndo_change_mtu)
4803 err = ops->ndo_change_mtu(dev, new_mtu);
4807 if (!err && dev->flags & IFF_UP)
4808 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4811 EXPORT_SYMBOL(dev_set_mtu);
4814 * dev_set_group - Change group this device belongs to
4816 * @new_group: group this device should belong to
4818 void dev_set_group(struct net_device *dev, int new_group)
4820 dev->group = new_group;
4822 EXPORT_SYMBOL(dev_set_group);
4825 * dev_set_mac_address - Change Media Access Control Address
4829 * Change the hardware (MAC) address of the device
4831 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4833 const struct net_device_ops *ops = dev->netdev_ops;
4836 if (!ops->ndo_set_mac_address)
4838 if (sa->sa_family != dev->type)
4840 if (!netif_device_present(dev))
4842 err = ops->ndo_set_mac_address(dev, sa);
4844 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4845 add_device_randomness(dev->dev_addr, dev->addr_len);
4848 EXPORT_SYMBOL(dev_set_mac_address);
4851 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4853 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4856 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4862 case SIOCGIFFLAGS: /* Get interface flags */
4863 ifr->ifr_flags = (short) dev_get_flags(dev);
4866 case SIOCGIFMETRIC: /* Get the metric on the interface
4867 (currently unused) */
4868 ifr->ifr_metric = 0;
4871 case SIOCGIFMTU: /* Get the MTU of a device */
4872 ifr->ifr_mtu = dev->mtu;
4877 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4879 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4880 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4881 ifr->ifr_hwaddr.sa_family = dev->type;
4889 ifr->ifr_map.mem_start = dev->mem_start;
4890 ifr->ifr_map.mem_end = dev->mem_end;
4891 ifr->ifr_map.base_addr = dev->base_addr;
4892 ifr->ifr_map.irq = dev->irq;
4893 ifr->ifr_map.dma = dev->dma;
4894 ifr->ifr_map.port = dev->if_port;
4898 ifr->ifr_ifindex = dev->ifindex;
4902 ifr->ifr_qlen = dev->tx_queue_len;
4906 /* dev_ioctl() should ensure this case
4918 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4920 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4923 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4924 const struct net_device_ops *ops;
4929 ops = dev->netdev_ops;
4932 case SIOCSIFFLAGS: /* Set interface flags */
4933 return dev_change_flags(dev, ifr->ifr_flags);
4935 case SIOCSIFMETRIC: /* Set the metric on the interface
4936 (currently unused) */
4939 case SIOCSIFMTU: /* Set the MTU of a device */
4940 return dev_set_mtu(dev, ifr->ifr_mtu);
4943 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4945 case SIOCSIFHWBROADCAST:
4946 if (ifr->ifr_hwaddr.sa_family != dev->type)
4948 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4949 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4950 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4954 if (ops->ndo_set_config) {
4955 if (!netif_device_present(dev))
4957 return ops->ndo_set_config(dev, &ifr->ifr_map);
4962 if (!ops->ndo_set_rx_mode ||
4963 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4965 if (!netif_device_present(dev))
4967 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4970 if (!ops->ndo_set_rx_mode ||
4971 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4973 if (!netif_device_present(dev))
4975 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4978 if (ifr->ifr_qlen < 0)
4980 dev->tx_queue_len = ifr->ifr_qlen;
4984 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4985 return dev_change_name(dev, ifr->ifr_newname);
4988 err = net_hwtstamp_validate(ifr);
4994 * Unknown or private ioctl
4997 if ((cmd >= SIOCDEVPRIVATE &&
4998 cmd <= SIOCDEVPRIVATE + 15) ||
4999 cmd == SIOCBONDENSLAVE ||
5000 cmd == SIOCBONDRELEASE ||
5001 cmd == SIOCBONDSETHWADDR ||
5002 cmd == SIOCBONDSLAVEINFOQUERY ||
5003 cmd == SIOCBONDINFOQUERY ||
5004 cmd == SIOCBONDCHANGEACTIVE ||
5005 cmd == SIOCGMIIPHY ||
5006 cmd == SIOCGMIIREG ||
5007 cmd == SIOCSMIIREG ||
5008 cmd == SIOCBRADDIF ||
5009 cmd == SIOCBRDELIF ||
5010 cmd == SIOCSHWTSTAMP ||
5011 cmd == SIOCWANDEV) {
5013 if (ops->ndo_do_ioctl) {
5014 if (netif_device_present(dev))
5015 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5027 * This function handles all "interface"-type I/O control requests. The actual
5028 * 'doing' part of this is dev_ifsioc above.
5032 * dev_ioctl - network device ioctl
5033 * @net: the applicable net namespace
5034 * @cmd: command to issue
5035 * @arg: pointer to a struct ifreq in user space
5037 * Issue ioctl functions to devices. This is normally called by the
5038 * user space syscall interfaces but can sometimes be useful for
5039 * other purposes. The return value is the return from the syscall if
5040 * positive or a negative errno code on error.
5043 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5049 /* One special case: SIOCGIFCONF takes ifconf argument
5050 and requires shared lock, because it sleeps writing
5054 if (cmd == SIOCGIFCONF) {
5056 ret = dev_ifconf(net, (char __user *) arg);
5060 if (cmd == SIOCGIFNAME)
5061 return dev_ifname(net, (struct ifreq __user *)arg);
5063 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5066 ifr.ifr_name[IFNAMSIZ-1] = 0;
5068 colon = strchr(ifr.ifr_name, ':');
5073 * See which interface the caller is talking about.
5078 * These ioctl calls:
5079 * - can be done by all.
5080 * - atomic and do not require locking.
5091 dev_load(net, ifr.ifr_name);
5093 ret = dev_ifsioc_locked(net, &ifr, cmd);
5098 if (copy_to_user(arg, &ifr,
5099 sizeof(struct ifreq)))
5105 dev_load(net, ifr.ifr_name);
5107 ret = dev_ethtool(net, &ifr);
5112 if (copy_to_user(arg, &ifr,
5113 sizeof(struct ifreq)))
5119 * These ioctl calls:
5120 * - require superuser power.
5121 * - require strict serialization.
5127 if (!capable(CAP_NET_ADMIN))
5129 dev_load(net, ifr.ifr_name);
5131 ret = dev_ifsioc(net, &ifr, cmd);
5136 if (copy_to_user(arg, &ifr,
5137 sizeof(struct ifreq)))
5143 * These ioctl calls:
5144 * - require superuser power.
5145 * - require strict serialization.
5146 * - do not return a value
5156 case SIOCSIFHWBROADCAST:
5159 case SIOCBONDENSLAVE:
5160 case SIOCBONDRELEASE:
5161 case SIOCBONDSETHWADDR:
5162 case SIOCBONDCHANGEACTIVE:
5166 if (!capable(CAP_NET_ADMIN))
5169 case SIOCBONDSLAVEINFOQUERY:
5170 case SIOCBONDINFOQUERY:
5171 dev_load(net, ifr.ifr_name);
5173 ret = dev_ifsioc(net, &ifr, cmd);
5178 /* Get the per device memory space. We can add this but
5179 * currently do not support it */
5181 /* Set the per device memory buffer space.
5182 * Not applicable in our case */
5187 * Unknown or private ioctl.
5190 if (cmd == SIOCWANDEV ||
5191 (cmd >= SIOCDEVPRIVATE &&
5192 cmd <= SIOCDEVPRIVATE + 15)) {
5193 dev_load(net, ifr.ifr_name);
5195 ret = dev_ifsioc(net, &ifr, cmd);
5197 if (!ret && copy_to_user(arg, &ifr,
5198 sizeof(struct ifreq)))
5202 /* Take care of Wireless Extensions */
5203 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5204 return wext_handle_ioctl(net, &ifr, cmd, arg);
5211 * dev_new_index - allocate an ifindex
5212 * @net: the applicable net namespace
5214 * Returns a suitable unique value for a new device interface
5215 * number. The caller must hold the rtnl semaphore or the
5216 * dev_base_lock to be sure it remains unique.
5218 static int dev_new_index(struct net *net)
5224 if (!__dev_get_by_index(net, ifindex))
5229 /* Delayed registration/unregisteration */
5230 static LIST_HEAD(net_todo_list);
5232 static void net_set_todo(struct net_device *dev)
5234 list_add_tail(&dev->todo_list, &net_todo_list);
5237 static void rollback_registered_many(struct list_head *head)
5239 struct net_device *dev, *tmp;
5241 BUG_ON(dev_boot_phase);
5244 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5245 /* Some devices call without registering
5246 * for initialization unwind. Remove those
5247 * devices and proceed with the remaining.
5249 if (dev->reg_state == NETREG_UNINITIALIZED) {
5250 pr_debug("unregister_netdevice: device %s/%p never "
5251 "was registered\n", dev->name, dev);
5254 list_del(&dev->unreg_list);
5257 dev->dismantle = true;
5258 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5261 /* If device is running, close it first. */
5262 dev_close_many(head);
5264 list_for_each_entry(dev, head, unreg_list) {
5265 /* And unlink it from device chain. */
5266 unlist_netdevice(dev);
5268 dev->reg_state = NETREG_UNREGISTERING;
5273 list_for_each_entry(dev, head, unreg_list) {
5274 /* Shutdown queueing discipline. */
5278 /* Notify protocols, that we are about to destroy
5279 this device. They should clean all the things.
5281 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5283 if (!dev->rtnl_link_ops ||
5284 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5285 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5288 * Flush the unicast and multicast chains
5293 if (dev->netdev_ops->ndo_uninit)
5294 dev->netdev_ops->ndo_uninit(dev);
5296 /* Notifier chain MUST detach us from master device. */
5297 WARN_ON(dev->master);
5299 /* Remove entries from kobject tree */
5300 netdev_unregister_kobject(dev);
5303 /* Process any work delayed until the end of the batch */
5304 dev = list_first_entry(head, struct net_device, unreg_list);
5305 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5309 list_for_each_entry(dev, head, unreg_list)
5313 static void rollback_registered(struct net_device *dev)
5317 list_add(&dev->unreg_list, &single);
5318 rollback_registered_many(&single);
5322 static u32 netdev_fix_features(struct net_device *dev, u32 features)
5324 /* Fix illegal checksum combinations */
5325 if ((features & NETIF_F_HW_CSUM) &&
5326 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5327 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5328 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5331 if ((features & NETIF_F_NO_CSUM) &&
5332 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5333 netdev_warn(dev, "mixed no checksumming and other settings.\n");
5334 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5337 /* Fix illegal SG+CSUM combinations. */
5338 if ((features & NETIF_F_SG) &&
5339 !(features & NETIF_F_ALL_CSUM)) {
5341 "Dropping NETIF_F_SG since no checksum feature.\n");
5342 features &= ~NETIF_F_SG;
5345 /* TSO requires that SG is present as well. */
5346 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5347 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5348 features &= ~NETIF_F_ALL_TSO;
5351 /* TSO ECN requires that TSO is present as well. */
5352 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5353 features &= ~NETIF_F_TSO_ECN;
5355 /* Software GSO depends on SG. */
5356 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5357 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5358 features &= ~NETIF_F_GSO;
5361 /* UFO needs SG and checksumming */
5362 if (features & NETIF_F_UFO) {
5363 /* maybe split UFO into V4 and V6? */
5364 if (!((features & NETIF_F_GEN_CSUM) ||
5365 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5366 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5368 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5369 features &= ~NETIF_F_UFO;
5372 if (!(features & NETIF_F_SG)) {
5374 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5375 features &= ~NETIF_F_UFO;
5382 int __netdev_update_features(struct net_device *dev)
5389 features = netdev_get_wanted_features(dev);
5391 if (dev->netdev_ops->ndo_fix_features)
5392 features = dev->netdev_ops->ndo_fix_features(dev, features);
5394 /* driver might be less strict about feature dependencies */
5395 features = netdev_fix_features(dev, features);
5397 if (dev->features == features)
5400 netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n",
5401 dev->features, features);
5403 if (dev->netdev_ops->ndo_set_features)
5404 err = dev->netdev_ops->ndo_set_features(dev, features);
5406 if (unlikely(err < 0)) {
5408 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5409 err, features, dev->features);
5414 dev->features = features;
5420 * netdev_update_features - recalculate device features
5421 * @dev: the device to check
5423 * Recalculate dev->features set and send notifications if it
5424 * has changed. Should be called after driver or hardware dependent
5425 * conditions might have changed that influence the features.
5427 void netdev_update_features(struct net_device *dev)
5429 if (__netdev_update_features(dev))
5430 netdev_features_change(dev);
5432 EXPORT_SYMBOL(netdev_update_features);
5435 * netdev_change_features - recalculate device features
5436 * @dev: the device to check
5438 * Recalculate dev->features set and send notifications even
5439 * if they have not changed. Should be called instead of
5440 * netdev_update_features() if also dev->vlan_features might
5441 * have changed to allow the changes to be propagated to stacked
5444 void netdev_change_features(struct net_device *dev)
5446 __netdev_update_features(dev);
5447 netdev_features_change(dev);
5449 EXPORT_SYMBOL(netdev_change_features);
5452 * netif_stacked_transfer_operstate - transfer operstate
5453 * @rootdev: the root or lower level device to transfer state from
5454 * @dev: the device to transfer operstate to
5456 * Transfer operational state from root to device. This is normally
5457 * called when a stacking relationship exists between the root
5458 * device and the device(a leaf device).
5460 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5461 struct net_device *dev)
5463 if (rootdev->operstate == IF_OPER_DORMANT)
5464 netif_dormant_on(dev);
5466 netif_dormant_off(dev);
5468 if (netif_carrier_ok(rootdev)) {
5469 if (!netif_carrier_ok(dev))
5470 netif_carrier_on(dev);
5472 if (netif_carrier_ok(dev))
5473 netif_carrier_off(dev);
5476 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5479 static int netif_alloc_rx_queues(struct net_device *dev)
5481 unsigned int i, count = dev->num_rx_queues;
5482 struct netdev_rx_queue *rx;
5486 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5488 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5493 for (i = 0; i < count; i++)
5499 static void netdev_init_one_queue(struct net_device *dev,
5500 struct netdev_queue *queue, void *_unused)
5502 /* Initialize queue lock */
5503 spin_lock_init(&queue->_xmit_lock);
5504 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5505 queue->xmit_lock_owner = -1;
5506 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5510 static int netif_alloc_netdev_queues(struct net_device *dev)
5512 unsigned int count = dev->num_tx_queues;
5513 struct netdev_queue *tx;
5517 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5519 pr_err("netdev: Unable to allocate %u tx queues.\n",
5525 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5526 spin_lock_init(&dev->tx_global_lock);
5532 * register_netdevice - register a network device
5533 * @dev: device to register
5535 * Take a completed network device structure and add it to the kernel
5536 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5537 * chain. 0 is returned on success. A negative errno code is returned
5538 * on a failure to set up the device, or if the name is a duplicate.
5540 * Callers must hold the rtnl semaphore. You may want
5541 * register_netdev() instead of this.
5544 * The locking appears insufficient to guarantee two parallel registers
5545 * will not get the same name.
5548 int register_netdevice(struct net_device *dev)
5551 struct net *net = dev_net(dev);
5553 BUG_ON(dev_boot_phase);
5558 /* When net_device's are persistent, this will be fatal. */
5559 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5562 spin_lock_init(&dev->addr_list_lock);
5563 netdev_set_addr_lockdep_class(dev);
5567 ret = dev_get_valid_name(dev, dev->name);
5571 /* Init, if this function is available */
5572 if (dev->netdev_ops->ndo_init) {
5573 ret = dev->netdev_ops->ndo_init(dev);
5581 dev->ifindex = dev_new_index(net);
5582 if (dev->iflink == -1)
5583 dev->iflink = dev->ifindex;
5585 /* Transfer changeable features to wanted_features and enable
5586 * software offloads (GSO and GRO).
5588 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5589 dev->features |= NETIF_F_SOFT_FEATURES;
5590 dev->wanted_features = dev->features & dev->hw_features;
5592 /* Turn on no cache copy if HW is doing checksum */
5593 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5594 if ((dev->features & NETIF_F_ALL_CSUM) &&
5595 !(dev->features & NETIF_F_NO_CSUM)) {
5596 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5597 dev->features |= NETIF_F_NOCACHE_COPY;
5600 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5602 dev->vlan_features |= NETIF_F_HIGHDMA;
5604 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5605 ret = notifier_to_errno(ret);
5609 ret = netdev_register_kobject(dev);
5612 dev->reg_state = NETREG_REGISTERED;
5614 __netdev_update_features(dev);
5617 * Default initial state at registry is that the
5618 * device is present.
5621 set_bit(__LINK_STATE_PRESENT, &dev->state);
5623 dev_init_scheduler(dev);
5625 list_netdevice(dev);
5626 add_device_randomness(dev->dev_addr, dev->addr_len);
5628 /* Notify protocols, that a new device appeared. */
5629 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5630 ret = notifier_to_errno(ret);
5632 rollback_registered(dev);
5633 dev->reg_state = NETREG_UNREGISTERED;
5636 * Prevent userspace races by waiting until the network
5637 * device is fully setup before sending notifications.
5639 if (!dev->rtnl_link_ops ||
5640 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5641 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5647 if (dev->netdev_ops->ndo_uninit)
5648 dev->netdev_ops->ndo_uninit(dev);
5651 EXPORT_SYMBOL(register_netdevice);
5654 * init_dummy_netdev - init a dummy network device for NAPI
5655 * @dev: device to init
5657 * This takes a network device structure and initialize the minimum
5658 * amount of fields so it can be used to schedule NAPI polls without
5659 * registering a full blown interface. This is to be used by drivers
5660 * that need to tie several hardware interfaces to a single NAPI
5661 * poll scheduler due to HW limitations.
5663 int init_dummy_netdev(struct net_device *dev)
5665 /* Clear everything. Note we don't initialize spinlocks
5666 * are they aren't supposed to be taken by any of the
5667 * NAPI code and this dummy netdev is supposed to be
5668 * only ever used for NAPI polls
5670 memset(dev, 0, sizeof(struct net_device));
5672 /* make sure we BUG if trying to hit standard
5673 * register/unregister code path
5675 dev->reg_state = NETREG_DUMMY;
5677 /* NAPI wants this */
5678 INIT_LIST_HEAD(&dev->napi_list);
5680 /* a dummy interface is started by default */
5681 set_bit(__LINK_STATE_PRESENT, &dev->state);
5682 set_bit(__LINK_STATE_START, &dev->state);
5684 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5685 * because users of this 'device' dont need to change
5691 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5695 * register_netdev - register a network device
5696 * @dev: device to register
5698 * Take a completed network device structure and add it to the kernel
5699 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5700 * chain. 0 is returned on success. A negative errno code is returned
5701 * on a failure to set up the device, or if the name is a duplicate.
5703 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5704 * and expands the device name if you passed a format string to
5707 int register_netdev(struct net_device *dev)
5712 err = register_netdevice(dev);
5716 EXPORT_SYMBOL(register_netdev);
5718 int netdev_refcnt_read(const struct net_device *dev)
5722 for_each_possible_cpu(i)
5723 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5726 EXPORT_SYMBOL(netdev_refcnt_read);
5729 * netdev_wait_allrefs - wait until all references are gone.
5731 * This is called when unregistering network devices.
5733 * Any protocol or device that holds a reference should register
5734 * for netdevice notification, and cleanup and put back the
5735 * reference if they receive an UNREGISTER event.
5736 * We can get stuck here if buggy protocols don't correctly
5739 static void netdev_wait_allrefs(struct net_device *dev)
5741 unsigned long rebroadcast_time, warning_time;
5744 linkwatch_forget_dev(dev);
5746 rebroadcast_time = warning_time = jiffies;
5747 refcnt = netdev_refcnt_read(dev);
5749 while (refcnt != 0) {
5750 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5753 /* Rebroadcast unregister notification */
5754 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5755 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5756 * should have already handle it the first time */
5758 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5760 /* We must not have linkwatch events
5761 * pending on unregister. If this
5762 * happens, we simply run the queue
5763 * unscheduled, resulting in a noop
5766 linkwatch_run_queue();
5771 rebroadcast_time = jiffies;
5776 refcnt = netdev_refcnt_read(dev);
5778 if (time_after(jiffies, warning_time + 10 * HZ)) {
5779 printk(KERN_EMERG "unregister_netdevice: "
5780 "waiting for %s to become free. Usage "
5783 warning_time = jiffies;
5792 * register_netdevice(x1);
5793 * register_netdevice(x2);
5795 * unregister_netdevice(y1);
5796 * unregister_netdevice(y2);
5802 * We are invoked by rtnl_unlock().
5803 * This allows us to deal with problems:
5804 * 1) We can delete sysfs objects which invoke hotplug
5805 * without deadlocking with linkwatch via keventd.
5806 * 2) Since we run with the RTNL semaphore not held, we can sleep
5807 * safely in order to wait for the netdev refcnt to drop to zero.
5809 * We must not return until all unregister events added during
5810 * the interval the lock was held have been completed.
5812 void netdev_run_todo(void)
5814 struct list_head list;
5816 /* Snapshot list, allow later requests */
5817 list_replace_init(&net_todo_list, &list);
5821 /* Wait for rcu callbacks to finish before attempting to drain
5822 * the device list. This usually avoids a 250ms wait.
5824 if (!list_empty(&list))
5827 while (!list_empty(&list)) {
5828 struct net_device *dev
5829 = list_first_entry(&list, struct net_device, todo_list);
5830 list_del(&dev->todo_list);
5832 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5833 printk(KERN_ERR "network todo '%s' but state %d\n",
5834 dev->name, dev->reg_state);
5839 dev->reg_state = NETREG_UNREGISTERED;
5841 on_each_cpu(flush_backlog, dev, 1);
5843 netdev_wait_allrefs(dev);
5846 BUG_ON(netdev_refcnt_read(dev));
5847 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5848 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5849 WARN_ON(dev->dn_ptr);
5851 if (dev->destructor)
5852 dev->destructor(dev);
5854 /* Free network device */
5855 kobject_put(&dev->dev.kobj);
5859 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5860 * fields in the same order, with only the type differing.
5862 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5863 const struct net_device_stats *netdev_stats)
5865 #if BITS_PER_LONG == 64
5866 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5867 memcpy(stats64, netdev_stats, sizeof(*stats64));
5869 size_t i, n = sizeof(*stats64) / sizeof(u64);
5870 const unsigned long *src = (const unsigned long *)netdev_stats;
5871 u64 *dst = (u64 *)stats64;
5873 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5874 sizeof(*stats64) / sizeof(u64));
5875 for (i = 0; i < n; i++)
5881 * dev_get_stats - get network device statistics
5882 * @dev: device to get statistics from
5883 * @storage: place to store stats
5885 * Get network statistics from device. Return @storage.
5886 * The device driver may provide its own method by setting
5887 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5888 * otherwise the internal statistics structure is used.
5890 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5891 struct rtnl_link_stats64 *storage)
5893 const struct net_device_ops *ops = dev->netdev_ops;
5895 if (ops->ndo_get_stats64) {
5896 memset(storage, 0, sizeof(*storage));
5897 ops->ndo_get_stats64(dev, storage);
5898 } else if (ops->ndo_get_stats) {
5899 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5901 netdev_stats_to_stats64(storage, &dev->stats);
5903 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5906 EXPORT_SYMBOL(dev_get_stats);
5908 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5910 struct netdev_queue *queue = dev_ingress_queue(dev);
5912 #ifdef CONFIG_NET_CLS_ACT
5915 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5918 netdev_init_one_queue(dev, queue, NULL);
5919 queue->qdisc = &noop_qdisc;
5920 queue->qdisc_sleeping = &noop_qdisc;
5921 rcu_assign_pointer(dev->ingress_queue, queue);
5927 * alloc_netdev_mqs - allocate network device
5928 * @sizeof_priv: size of private data to allocate space for
5929 * @name: device name format string
5930 * @setup: callback to initialize device
5931 * @txqs: the number of TX subqueues to allocate
5932 * @rxqs: the number of RX subqueues to allocate
5934 * Allocates a struct net_device with private data area for driver use
5935 * and performs basic initialization. Also allocates subquue structs
5936 * for each queue on the device.
5938 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5939 void (*setup)(struct net_device *),
5940 unsigned int txqs, unsigned int rxqs)
5942 struct net_device *dev;
5944 struct net_device *p;
5946 BUG_ON(strlen(name) >= sizeof(dev->name));
5949 pr_err("alloc_netdev: Unable to allocate device "
5950 "with zero queues.\n");
5956 pr_err("alloc_netdev: Unable to allocate device "
5957 "with zero RX queues.\n");
5962 alloc_size = sizeof(struct net_device);
5964 /* ensure 32-byte alignment of private area */
5965 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5966 alloc_size += sizeof_priv;
5968 /* ensure 32-byte alignment of whole construct */
5969 alloc_size += NETDEV_ALIGN - 1;
5971 p = kzalloc(alloc_size, GFP_KERNEL);
5973 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5977 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5978 dev->padded = (char *)dev - (char *)p;
5980 dev->pcpu_refcnt = alloc_percpu(int);
5981 if (!dev->pcpu_refcnt)
5984 if (dev_addr_init(dev))
5990 dev_net_set(dev, &init_net);
5992 dev->gso_max_size = GSO_MAX_SIZE;
5994 INIT_LIST_HEAD(&dev->napi_list);
5995 INIT_LIST_HEAD(&dev->unreg_list);
5996 INIT_LIST_HEAD(&dev->link_watch_list);
5997 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6000 dev->num_tx_queues = txqs;
6001 dev->real_num_tx_queues = txqs;
6002 if (netif_alloc_netdev_queues(dev))
6006 dev->num_rx_queues = rxqs;
6007 dev->real_num_rx_queues = rxqs;
6008 if (netif_alloc_rx_queues(dev))
6012 strcpy(dev->name, name);
6013 dev->group = INIT_NETDEV_GROUP;
6021 free_percpu(dev->pcpu_refcnt);
6031 EXPORT_SYMBOL(alloc_netdev_mqs);
6034 * free_netdev - free network device
6037 * This function does the last stage of destroying an allocated device
6038 * interface. The reference to the device object is released.
6039 * If this is the last reference then it will be freed.
6041 void free_netdev(struct net_device *dev)
6043 struct napi_struct *p, *n;
6045 release_net(dev_net(dev));
6052 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6054 /* Flush device addresses */
6055 dev_addr_flush(dev);
6057 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6060 free_percpu(dev->pcpu_refcnt);
6061 dev->pcpu_refcnt = NULL;
6063 /* Compatibility with error handling in drivers */
6064 if (dev->reg_state == NETREG_UNINITIALIZED) {
6065 kfree((char *)dev - dev->padded);
6069 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6070 dev->reg_state = NETREG_RELEASED;
6072 /* will free via device release */
6073 put_device(&dev->dev);
6075 EXPORT_SYMBOL(free_netdev);
6078 * synchronize_net - Synchronize with packet receive processing
6080 * Wait for packets currently being received to be done.
6081 * Does not block later packets from starting.
6083 void synchronize_net(void)
6086 if (rtnl_is_locked())
6087 synchronize_rcu_expedited();
6091 EXPORT_SYMBOL(synchronize_net);
6094 * unregister_netdevice_queue - remove device from the kernel
6098 * This function shuts down a device interface and removes it
6099 * from the kernel tables.
6100 * If head not NULL, device is queued to be unregistered later.
6102 * Callers must hold the rtnl semaphore. You may want
6103 * unregister_netdev() instead of this.
6106 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6111 list_move_tail(&dev->unreg_list, head);
6113 rollback_registered(dev);
6114 /* Finish processing unregister after unlock */
6118 EXPORT_SYMBOL(unregister_netdevice_queue);
6121 * unregister_netdevice_many - unregister many devices
6122 * @head: list of devices
6124 void unregister_netdevice_many(struct list_head *head)
6126 struct net_device *dev;
6128 if (!list_empty(head)) {
6129 rollback_registered_many(head);
6130 list_for_each_entry(dev, head, unreg_list)
6134 EXPORT_SYMBOL(unregister_netdevice_many);
6137 * unregister_netdev - remove device from the kernel
6140 * This function shuts down a device interface and removes it
6141 * from the kernel tables.
6143 * This is just a wrapper for unregister_netdevice that takes
6144 * the rtnl semaphore. In general you want to use this and not
6145 * unregister_netdevice.
6147 void unregister_netdev(struct net_device *dev)
6150 unregister_netdevice(dev);
6153 EXPORT_SYMBOL(unregister_netdev);
6156 * dev_change_net_namespace - move device to different nethost namespace
6158 * @net: network namespace
6159 * @pat: If not NULL name pattern to try if the current device name
6160 * is already taken in the destination network namespace.
6162 * This function shuts down a device interface and moves it
6163 * to a new network namespace. On success 0 is returned, on
6164 * a failure a netagive errno code is returned.
6166 * Callers must hold the rtnl semaphore.
6169 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6175 /* Don't allow namespace local devices to be moved. */
6177 if (dev->features & NETIF_F_NETNS_LOCAL)
6180 /* Ensure the device has been registrered */
6182 if (dev->reg_state != NETREG_REGISTERED)
6185 /* Get out if there is nothing todo */
6187 if (net_eq(dev_net(dev), net))
6190 /* Pick the destination device name, and ensure
6191 * we can use it in the destination network namespace.
6194 if (__dev_get_by_name(net, dev->name)) {
6195 /* We get here if we can't use the current device name */
6198 if (dev_get_valid_name(dev, pat) < 0)
6203 * And now a mini version of register_netdevice unregister_netdevice.
6206 /* If device is running close it first. */
6209 /* And unlink it from device chain */
6211 unlist_netdevice(dev);
6215 /* Shutdown queueing discipline. */
6218 /* Notify protocols, that we are about to destroy
6219 this device. They should clean all the things.
6221 Note that dev->reg_state stays at NETREG_REGISTERED.
6222 This is wanted because this way 8021q and macvlan know
6223 the device is just moving and can keep their slaves up.
6225 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6226 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6227 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6230 * Flush the unicast and multicast chains
6235 /* Actually switch the network namespace */
6236 dev_net_set(dev, net);
6238 /* If there is an ifindex conflict assign a new one */
6239 if (__dev_get_by_index(net, dev->ifindex)) {
6240 int iflink = (dev->iflink == dev->ifindex);
6241 dev->ifindex = dev_new_index(net);
6243 dev->iflink = dev->ifindex;
6246 /* Fixup kobjects */
6247 err = device_rename(&dev->dev, dev->name);
6250 /* Add the device back in the hashes */
6251 list_netdevice(dev);
6253 /* Notify protocols, that a new device appeared. */
6254 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6257 * Prevent userspace races by waiting until the network
6258 * device is fully setup before sending notifications.
6260 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6267 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6269 static int dev_cpu_callback(struct notifier_block *nfb,
6270 unsigned long action,
6273 struct sk_buff **list_skb;
6274 struct sk_buff *skb;
6275 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6276 struct softnet_data *sd, *oldsd;
6278 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6281 local_irq_disable();
6282 cpu = smp_processor_id();
6283 sd = &per_cpu(softnet_data, cpu);
6284 oldsd = &per_cpu(softnet_data, oldcpu);
6286 /* Find end of our completion_queue. */
6287 list_skb = &sd->completion_queue;
6289 list_skb = &(*list_skb)->next;
6290 /* Append completion queue from offline CPU. */
6291 *list_skb = oldsd->completion_queue;
6292 oldsd->completion_queue = NULL;
6294 /* Append output queue from offline CPU. */
6295 if (oldsd->output_queue) {
6296 *sd->output_queue_tailp = oldsd->output_queue;
6297 sd->output_queue_tailp = oldsd->output_queue_tailp;
6298 oldsd->output_queue = NULL;
6299 oldsd->output_queue_tailp = &oldsd->output_queue;
6301 /* Append NAPI poll list from offline CPU. */
6302 if (!list_empty(&oldsd->poll_list)) {
6303 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6304 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6307 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6310 /* Process offline CPU's input_pkt_queue */
6311 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6313 input_queue_head_incr(oldsd);
6315 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6317 input_queue_head_incr(oldsd);
6325 * netdev_increment_features - increment feature set by one
6326 * @all: current feature set
6327 * @one: new feature set
6328 * @mask: mask feature set
6330 * Computes a new feature set after adding a device with feature set
6331 * @one to the master device with current feature set @all. Will not
6332 * enable anything that is off in @mask. Returns the new feature set.
6334 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6336 if (mask & NETIF_F_GEN_CSUM)
6337 mask |= NETIF_F_ALL_CSUM;
6338 mask |= NETIF_F_VLAN_CHALLENGED;
6340 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6341 all &= one | ~NETIF_F_ALL_FOR_ALL;
6343 /* If device needs checksumming, downgrade to it. */
6344 if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
6345 all &= ~NETIF_F_NO_CSUM;
6347 /* If one device supports hw checksumming, set for all. */
6348 if (all & NETIF_F_GEN_CSUM)
6349 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6353 EXPORT_SYMBOL(netdev_increment_features);
6355 static struct hlist_head *netdev_create_hash(void)
6358 struct hlist_head *hash;
6360 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6362 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6363 INIT_HLIST_HEAD(&hash[i]);
6368 /* Initialize per network namespace state */
6369 static int __net_init netdev_init(struct net *net)
6371 INIT_LIST_HEAD(&net->dev_base_head);
6373 net->dev_name_head = netdev_create_hash();
6374 if (net->dev_name_head == NULL)
6377 net->dev_index_head = netdev_create_hash();
6378 if (net->dev_index_head == NULL)
6384 kfree(net->dev_name_head);
6390 * netdev_drivername - network driver for the device
6391 * @dev: network device
6393 * Determine network driver for device.
6395 const char *netdev_drivername(const struct net_device *dev)
6397 const struct device_driver *driver;
6398 const struct device *parent;
6399 const char *empty = "";
6401 parent = dev->dev.parent;
6405 driver = parent->driver;
6406 if (driver && driver->name)
6407 return driver->name;
6411 int __netdev_printk(const char *level, const struct net_device *dev,
6412 struct va_format *vaf)
6416 if (dev && dev->dev.parent)
6417 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6418 netdev_name(dev), vaf);
6420 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6422 r = printk("%s(NULL net_device): %pV", level, vaf);
6426 EXPORT_SYMBOL(__netdev_printk);
6428 int netdev_printk(const char *level, const struct net_device *dev,
6429 const char *format, ...)
6431 struct va_format vaf;
6435 va_start(args, format);
6440 r = __netdev_printk(level, dev, &vaf);
6445 EXPORT_SYMBOL(netdev_printk);
6447 #define define_netdev_printk_level(func, level) \
6448 int func(const struct net_device *dev, const char *fmt, ...) \
6451 struct va_format vaf; \
6454 va_start(args, fmt); \
6459 r = __netdev_printk(level, dev, &vaf); \
6464 EXPORT_SYMBOL(func);
6466 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6467 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6468 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6469 define_netdev_printk_level(netdev_err, KERN_ERR);
6470 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6471 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6472 define_netdev_printk_level(netdev_info, KERN_INFO);
6474 static void __net_exit netdev_exit(struct net *net)
6476 kfree(net->dev_name_head);
6477 kfree(net->dev_index_head);
6480 static struct pernet_operations __net_initdata netdev_net_ops = {
6481 .init = netdev_init,
6482 .exit = netdev_exit,
6485 static void __net_exit default_device_exit(struct net *net)
6487 struct net_device *dev, *aux;
6489 * Push all migratable network devices back to the
6490 * initial network namespace
6493 for_each_netdev_safe(net, dev, aux) {
6495 char fb_name[IFNAMSIZ];
6497 /* Ignore unmoveable devices (i.e. loopback) */
6498 if (dev->features & NETIF_F_NETNS_LOCAL)
6501 /* Leave virtual devices for the generic cleanup */
6502 if (dev->rtnl_link_ops)
6505 /* Push remaining network devices to init_net */
6506 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6507 err = dev_change_net_namespace(dev, &init_net, fb_name);
6509 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6510 __func__, dev->name, err);
6517 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6519 /* At exit all network devices most be removed from a network
6520 * namespace. Do this in the reverse order of registration.
6521 * Do this across as many network namespaces as possible to
6522 * improve batching efficiency.
6524 struct net_device *dev;
6526 LIST_HEAD(dev_kill_list);
6529 list_for_each_entry(net, net_list, exit_list) {
6530 for_each_netdev_reverse(net, dev) {
6531 if (dev->rtnl_link_ops)
6532 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6534 unregister_netdevice_queue(dev, &dev_kill_list);
6537 unregister_netdevice_many(&dev_kill_list);
6538 list_del(&dev_kill_list);
6542 static struct pernet_operations __net_initdata default_device_ops = {
6543 .exit = default_device_exit,
6544 .exit_batch = default_device_exit_batch,
6548 * Initialize the DEV module. At boot time this walks the device list and
6549 * unhooks any devices that fail to initialise (normally hardware not
6550 * present) and leaves us with a valid list of present and active devices.
6555 * This is called single threaded during boot, so no need
6556 * to take the rtnl semaphore.
6558 static int __init net_dev_init(void)
6560 int i, rc = -ENOMEM;
6562 BUG_ON(!dev_boot_phase);
6564 if (dev_proc_init())
6567 if (netdev_kobject_init())
6570 INIT_LIST_HEAD(&ptype_all);
6571 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6572 INIT_LIST_HEAD(&ptype_base[i]);
6574 if (register_pernet_subsys(&netdev_net_ops))
6578 * Initialise the packet receive queues.
6581 for_each_possible_cpu(i) {
6582 struct softnet_data *sd = &per_cpu(softnet_data, i);
6584 memset(sd, 0, sizeof(*sd));
6585 skb_queue_head_init(&sd->input_pkt_queue);
6586 skb_queue_head_init(&sd->process_queue);
6587 sd->completion_queue = NULL;
6588 INIT_LIST_HEAD(&sd->poll_list);
6589 sd->output_queue = NULL;
6590 sd->output_queue_tailp = &sd->output_queue;
6592 sd->csd.func = rps_trigger_softirq;
6598 sd->backlog.poll = process_backlog;
6599 sd->backlog.weight = weight_p;
6600 sd->backlog.gro_list = NULL;
6601 sd->backlog.gro_count = 0;
6606 /* The loopback device is special if any other network devices
6607 * is present in a network namespace the loopback device must
6608 * be present. Since we now dynamically allocate and free the
6609 * loopback device ensure this invariant is maintained by
6610 * keeping the loopback device as the first device on the
6611 * list of network devices. Ensuring the loopback devices
6612 * is the first device that appears and the last network device
6615 if (register_pernet_device(&loopback_net_ops))
6618 if (register_pernet_device(&default_device_ops))
6621 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6622 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6624 hotcpu_notifier(dev_cpu_callback, 0);
6632 subsys_initcall(net_dev_init);
6634 static int __init initialize_hashrnd(void)
6636 get_random_bytes(&hashrnd, sizeof(hashrnd));
6640 late_initcall_sync(initialize_hashrnd);