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Linux/drivers/net/bonding/bond_main.c

  1 /*
  2  * originally based on the dummy device.
  3  *
  4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
  5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
  6  *
  7  * bonding.c: an Ethernet Bonding driver
  8  *
  9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
 10  *      Cisco 5500
 11  *      Sun Trunking (Solaris)
 12  *      Alteon AceDirector Trunks
 13  *      Linux Bonding
 14  *      and probably many L2 switches ...
 15  *
 16  * How it works:
 17  *    ifconfig bond0 ipaddress netmask up
 18  *      will setup a network device, with an ip address.  No mac address
 19  *      will be assigned at this time.  The hw mac address will come from
 20  *      the first slave bonded to the channel.  All slaves will then use
 21  *      this hw mac address.
 22  *
 23  *    ifconfig bond0 down
 24  *         will release all slaves, marking them as down.
 25  *
 26  *    ifenslave bond0 eth0
 27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
 28  *      a: be used as initial mac address
 29  *      b: if a hw mac address already is there, eth0's hw mac address
 30  *         will then be set from bond0.
 31  *
 32  */
 33 
 34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 35 
 36 #include <linux/kernel.h>
 37 #include <linux/module.h>
 38 #include <linux/types.h>
 39 #include <linux/fcntl.h>
 40 #include <linux/interrupt.h>
 41 #include <linux/ptrace.h>
 42 #include <linux/ioport.h>
 43 #include <linux/in.h>
 44 #include <net/ip.h>
 45 #include <linux/ip.h>
 46 #include <linux/tcp.h>
 47 #include <linux/udp.h>
 48 #include <linux/slab.h>
 49 #include <linux/string.h>
 50 #include <linux/init.h>
 51 #include <linux/timer.h>
 52 #include <linux/socket.h>
 53 #include <linux/ctype.h>
 54 #include <linux/inet.h>
 55 #include <linux/bitops.h>
 56 #include <linux/io.h>
 57 #include <asm/dma.h>
 58 #include <linux/uaccess.h>
 59 #include <linux/errno.h>
 60 #include <linux/netdevice.h>
 61 #include <linux/inetdevice.h>
 62 #include <linux/igmp.h>
 63 #include <linux/etherdevice.h>
 64 #include <linux/skbuff.h>
 65 #include <net/sock.h>
 66 #include <linux/rtnetlink.h>
 67 #include <linux/smp.h>
 68 #include <linux/if_ether.h>
 69 #include <net/arp.h>
 70 #include <linux/mii.h>
 71 #include <linux/ethtool.h>
 72 #include <linux/if_vlan.h>
 73 #include <linux/if_bonding.h>
 74 #include <linux/jiffies.h>
 75 #include <linux/preempt.h>
 76 #include <net/route.h>
 77 #include <net/net_namespace.h>
 78 #include <net/netns/generic.h>
 79 #include <net/pkt_sched.h>
 80 #include <linux/rculist.h>
 81 #include <net/flow_keys.h>
 82 #include "bonding.h"
 83 #include "bond_3ad.h"
 84 #include "bond_alb.h"
 85 
 86 /*---------------------------- Module parameters ----------------------------*/
 87 
 88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
 89 
 90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
 91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
 92 static int num_peer_notif = 1;
 93 static int miimon;
 94 static int updelay;
 95 static int downdelay;
 96 static int use_carrier  = 1;
 97 static char *mode;
 98 static char *primary;
 99 static char *primary_reselect;
100 static char *lacp_rate;
101 static int min_links;
102 static char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *arp_all_targets;
108 static char *fail_over_mac;
109 static int all_slaves_active;
110 static struct bond_params bonding_defaults;
111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
112 static int packets_per_slave = 1;
113 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
114 
115 module_param(max_bonds, int, 0);
116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
117 module_param(tx_queues, int, 0);
118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
119 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
120 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
121                                "failover event (alias of num_unsol_na)");
122 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
123 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
124                                "failover event (alias of num_grat_arp)");
125 module_param(miimon, int, 0);
126 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
127 module_param(updelay, int, 0);
128 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
129 module_param(downdelay, int, 0);
130 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
131                             "in milliseconds");
132 module_param(use_carrier, int, 0);
133 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
134                               "0 for off, 1 for on (default)");
135 module_param(mode, charp, 0);
136 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
137                        "1 for active-backup, 2 for balance-xor, "
138                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
139                        "6 for balance-alb");
140 module_param(primary, charp, 0);
141 MODULE_PARM_DESC(primary, "Primary network device to use");
142 module_param(primary_reselect, charp, 0);
143 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
144                                    "once it comes up; "
145                                    "0 for always (default), "
146                                    "1 for only if speed of primary is "
147                                    "better, "
148                                    "2 for only on active slave "
149                                    "failure");
150 module_param(lacp_rate, charp, 0);
151 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
152                             "0 for slow, 1 for fast");
153 module_param(ad_select, charp, 0);
154 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
155                             "0 for stable (default), 1 for bandwidth, "
156                             "2 for count");
157 module_param(min_links, int, 0);
158 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
159 
160 module_param(xmit_hash_policy, charp, 0);
161 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
162                                    "0 for layer 2 (default), 1 for layer 3+4, "
163                                    "2 for layer 2+3, 3 for encap layer 2+3, "
164                                    "4 for encap layer 3+4");
165 module_param(arp_interval, int, 0);
166 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
167 module_param_array(arp_ip_target, charp, NULL, 0);
168 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
169 module_param(arp_validate, charp, 0);
170 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
171                                "0 for none (default), 1 for active, "
172                                "2 for backup, 3 for all");
173 module_param(arp_all_targets, charp, 0);
174 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
175 module_param(fail_over_mac, charp, 0);
176 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
177                                 "the same MAC; 0 for none (default), "
178                                 "1 for active, 2 for follow");
179 module_param(all_slaves_active, int, 0);
180 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
181                                      "by setting active flag for all slaves; "
182                                      "0 for never (default), 1 for always.");
183 module_param(resend_igmp, int, 0);
184 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
185                               "link failure");
186 module_param(packets_per_slave, int, 0);
187 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
188                                     "mode; 0 for a random slave, 1 packet per "
189                                     "slave (default), >1 packets per slave.");
190 module_param(lp_interval, uint, 0);
191 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
192                               "the bonding driver sends learning packets to "
193                               "each slaves peer switch. The default is 1.");
194 
195 /*----------------------------- Global variables ----------------------------*/
196 
197 #ifdef CONFIG_NET_POLL_CONTROLLER
198 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
199 #endif
200 
201 int bond_net_id __read_mostly;
202 
203 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
204 static int arp_ip_count;
205 static int bond_mode    = BOND_MODE_ROUNDROBIN;
206 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
207 static int lacp_fast;
208 
209 /*-------------------------- Forward declarations ---------------------------*/
210 
211 static int bond_init(struct net_device *bond_dev);
212 static void bond_uninit(struct net_device *bond_dev);
213 
214 /*---------------------------- General routines -----------------------------*/
215 
216 const char *bond_mode_name(int mode)
217 {
218         static const char *names[] = {
219                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
220                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
221                 [BOND_MODE_XOR] = "load balancing (xor)",
222                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
223                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
224                 [BOND_MODE_TLB] = "transmit load balancing",
225                 [BOND_MODE_ALB] = "adaptive load balancing",
226         };
227 
228         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
229                 return "unknown";
230 
231         return names[mode];
232 }
233 
234 /*---------------------------------- VLAN -----------------------------------*/
235 
236 /**
237  * bond_dev_queue_xmit - Prepare skb for xmit.
238  *
239  * @bond: bond device that got this skb for tx.
240  * @skb: hw accel VLAN tagged skb to transmit
241  * @slave_dev: slave that is supposed to xmit this skbuff
242  */
243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
244                         struct net_device *slave_dev)
245 {
246         skb->dev = slave_dev;
247 
248         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
249                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
250         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
251 
252         if (unlikely(netpoll_tx_running(bond->dev)))
253                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
254         else
255                 dev_queue_xmit(skb);
256 }
257 
258 /*
259  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
260  * We don't protect the slave list iteration with a lock because:
261  * a. This operation is performed in IOCTL context,
262  * b. The operation is protected by the RTNL semaphore in the 8021q code,
263  * c. Holding a lock with BH disabled while directly calling a base driver
264  *    entry point is generally a BAD idea.
265  *
266  * The design of synchronization/protection for this operation in the 8021q
267  * module is good for one or more VLAN devices over a single physical device
268  * and cannot be extended for a teaming solution like bonding, so there is a
269  * potential race condition here where a net device from the vlan group might
270  * be referenced (either by a base driver or the 8021q code) while it is being
271  * removed from the system. However, it turns out we're not making matters
272  * worse, and if it works for regular VLAN usage it will work here too.
273 */
274 
275 /**
276  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
277  * @bond_dev: bonding net device that got called
278  * @vid: vlan id being added
279  */
280 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
281                                 __be16 proto, u16 vid)
282 {
283         struct bonding *bond = netdev_priv(bond_dev);
284         struct slave *slave, *rollback_slave;
285         struct list_head *iter;
286         int res;
287 
288         bond_for_each_slave(bond, slave, iter) {
289                 res = vlan_vid_add(slave->dev, proto, vid);
290                 if (res)
291                         goto unwind;
292         }
293 
294         return 0;
295 
296 unwind:
297         /* unwind to the slave that failed */
298         bond_for_each_slave(bond, rollback_slave, iter) {
299                 if (rollback_slave == slave)
300                         break;
301 
302                 vlan_vid_del(rollback_slave->dev, proto, vid);
303         }
304 
305         return res;
306 }
307 
308 /**
309  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
310  * @bond_dev: bonding net device that got called
311  * @vid: vlan id being removed
312  */
313 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
314                                  __be16 proto, u16 vid)
315 {
316         struct bonding *bond = netdev_priv(bond_dev);
317         struct list_head *iter;
318         struct slave *slave;
319 
320         bond_for_each_slave(bond, slave, iter)
321                 vlan_vid_del(slave->dev, proto, vid);
322 
323         if (bond_is_lb(bond))
324                 bond_alb_clear_vlan(bond, vid);
325 
326         return 0;
327 }
328 
329 /*------------------------------- Link status -------------------------------*/
330 
331 /*
332  * Set the carrier state for the master according to the state of its
333  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
334  * do special 802.3ad magic.
335  *
336  * Returns zero if carrier state does not change, nonzero if it does.
337  */
338 static int bond_set_carrier(struct bonding *bond)
339 {
340         struct list_head *iter;
341         struct slave *slave;
342 
343         if (!bond_has_slaves(bond))
344                 goto down;
345 
346         if (bond->params.mode == BOND_MODE_8023AD)
347                 return bond_3ad_set_carrier(bond);
348 
349         bond_for_each_slave(bond, slave, iter) {
350                 if (slave->link == BOND_LINK_UP) {
351                         if (!netif_carrier_ok(bond->dev)) {
352                                 netif_carrier_on(bond->dev);
353                                 return 1;
354                         }
355                         return 0;
356                 }
357         }
358 
359 down:
360         if (netif_carrier_ok(bond->dev)) {
361                 netif_carrier_off(bond->dev);
362                 return 1;
363         }
364         return 0;
365 }
366 
367 /*
368  * Get link speed and duplex from the slave's base driver
369  * using ethtool. If for some reason the call fails or the
370  * values are invalid, set speed and duplex to -1,
371  * and return.
372  */
373 static void bond_update_speed_duplex(struct slave *slave)
374 {
375         struct net_device *slave_dev = slave->dev;
376         struct ethtool_cmd ecmd;
377         u32 slave_speed;
378         int res;
379 
380         slave->speed = SPEED_UNKNOWN;
381         slave->duplex = DUPLEX_UNKNOWN;
382 
383         res = __ethtool_get_settings(slave_dev, &ecmd);
384         if (res < 0)
385                 return;
386 
387         slave_speed = ethtool_cmd_speed(&ecmd);
388         if (slave_speed == 0 || slave_speed == ((__u32) -1))
389                 return;
390 
391         switch (ecmd.duplex) {
392         case DUPLEX_FULL:
393         case DUPLEX_HALF:
394                 break;
395         default:
396                 return;
397         }
398 
399         slave->speed = slave_speed;
400         slave->duplex = ecmd.duplex;
401 
402         return;
403 }
404 
405 const char *bond_slave_link_status(s8 link)
406 {
407         switch (link) {
408         case BOND_LINK_UP:
409                 return "up";
410         case BOND_LINK_FAIL:
411                 return "going down";
412         case BOND_LINK_DOWN:
413                 return "down";
414         case BOND_LINK_BACK:
415                 return "going back";
416         default:
417                 return "unknown";
418         }
419 }
420 
421 /*
422  * if <dev> supports MII link status reporting, check its link status.
423  *
424  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425  * depending upon the setting of the use_carrier parameter.
426  *
427  * Return either BMSR_LSTATUS, meaning that the link is up (or we
428  * can't tell and just pretend it is), or 0, meaning that the link is
429  * down.
430  *
431  * If reporting is non-zero, instead of faking link up, return -1 if
432  * both ETHTOOL and MII ioctls fail (meaning the device does not
433  * support them).  If use_carrier is set, return whatever it says.
434  * It'd be nice if there was a good way to tell if a driver supports
435  * netif_carrier, but there really isn't.
436  */
437 static int bond_check_dev_link(struct bonding *bond,
438                                struct net_device *slave_dev, int reporting)
439 {
440         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441         int (*ioctl)(struct net_device *, struct ifreq *, int);
442         struct ifreq ifr;
443         struct mii_ioctl_data *mii;
444 
445         if (!reporting && !netif_running(slave_dev))
446                 return 0;
447 
448         if (bond->params.use_carrier)
449                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
450 
451         /* Try to get link status using Ethtool first. */
452         if (slave_dev->ethtool_ops->get_link)
453                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
454                         BMSR_LSTATUS : 0;
455 
456         /* Ethtool can't be used, fallback to MII ioctls. */
457         ioctl = slave_ops->ndo_do_ioctl;
458         if (ioctl) {
459                 /* TODO: set pointer to correct ioctl on a per team member */
460                 /*       bases to make this more efficient. that is, once  */
461                 /*       we determine the correct ioctl, we will always    */
462                 /*       call it and not the others for that team          */
463                 /*       member.                                           */
464 
465                 /*
466                  * We cannot assume that SIOCGMIIPHY will also read a
467                  * register; not all network drivers (e.g., e100)
468                  * support that.
469                  */
470 
471                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
473                 mii = if_mii(&ifr);
474                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
475                         mii->reg_num = MII_BMSR;
476                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
477                                 return mii->val_out & BMSR_LSTATUS;
478                 }
479         }
480 
481         /*
482          * If reporting, report that either there's no dev->do_ioctl,
483          * or both SIOCGMIIREG and get_link failed (meaning that we
484          * cannot report link status).  If not reporting, pretend
485          * we're ok.
486          */
487         return reporting ? -1 : BMSR_LSTATUS;
488 }
489 
490 /*----------------------------- Multicast list ------------------------------*/
491 
492 /*
493  * Push the promiscuity flag down to appropriate slaves
494  */
495 static int bond_set_promiscuity(struct bonding *bond, int inc)
496 {
497         struct list_head *iter;
498         int err = 0;
499 
500         if (USES_PRIMARY(bond->params.mode)) {
501                 /* write lock already acquired */
502                 if (bond->curr_active_slave) {
503                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
504                                                   inc);
505                 }
506         } else {
507                 struct slave *slave;
508 
509                 bond_for_each_slave(bond, slave, iter) {
510                         err = dev_set_promiscuity(slave->dev, inc);
511                         if (err)
512                                 return err;
513                 }
514         }
515         return err;
516 }
517 
518 /*
519  * Push the allmulti flag down to all slaves
520  */
521 static int bond_set_allmulti(struct bonding *bond, int inc)
522 {
523         struct list_head *iter;
524         int err = 0;
525 
526         if (USES_PRIMARY(bond->params.mode)) {
527                 /* write lock already acquired */
528                 if (bond->curr_active_slave) {
529                         err = dev_set_allmulti(bond->curr_active_slave->dev,
530                                                inc);
531                 }
532         } else {
533                 struct slave *slave;
534 
535                 bond_for_each_slave(bond, slave, iter) {
536                         err = dev_set_allmulti(slave->dev, inc);
537                         if (err)
538                                 return err;
539                 }
540         }
541         return err;
542 }
543 
544 /*
545  * Retrieve the list of registered multicast addresses for the bonding
546  * device and retransmit an IGMP JOIN request to the current active
547  * slave.
548  */
549 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
550 {
551         struct bonding *bond = container_of(work, struct bonding,
552                                             mcast_work.work);
553 
554         if (!rtnl_trylock()) {
555                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
556                 return;
557         }
558         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
559 
560         if (bond->igmp_retrans > 1) {
561                 bond->igmp_retrans--;
562                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
563         }
564         rtnl_unlock();
565 }
566 
567 /* Flush bond's hardware addresses from slave
568  */
569 static void bond_hw_addr_flush(struct net_device *bond_dev,
570                                struct net_device *slave_dev)
571 {
572         struct bonding *bond = netdev_priv(bond_dev);
573 
574         dev_uc_unsync(slave_dev, bond_dev);
575         dev_mc_unsync(slave_dev, bond_dev);
576 
577         if (bond->params.mode == BOND_MODE_8023AD) {
578                 /* del lacpdu mc addr from mc list */
579                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
580 
581                 dev_mc_del(slave_dev, lacpdu_multicast);
582         }
583 }
584 
585 /*--------------------------- Active slave change ---------------------------*/
586 
587 /* Update the hardware address list and promisc/allmulti for the new and
588  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
589  * slaves up date at all times; only the USES_PRIMARY modes need to call
590  * this function to swap these settings during a failover.
591  */
592 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
593                               struct slave *old_active)
594 {
595         ASSERT_RTNL();
596 
597         if (old_active) {
598                 if (bond->dev->flags & IFF_PROMISC)
599                         dev_set_promiscuity(old_active->dev, -1);
600 
601                 if (bond->dev->flags & IFF_ALLMULTI)
602                         dev_set_allmulti(old_active->dev, -1);
603 
604                 bond_hw_addr_flush(bond->dev, old_active->dev);
605         }
606 
607         if (new_active) {
608                 /* FIXME: Signal errors upstream. */
609                 if (bond->dev->flags & IFF_PROMISC)
610                         dev_set_promiscuity(new_active->dev, 1);
611 
612                 if (bond->dev->flags & IFF_ALLMULTI)
613                         dev_set_allmulti(new_active->dev, 1);
614 
615                 netif_addr_lock_bh(bond->dev);
616                 dev_uc_sync(new_active->dev, bond->dev);
617                 dev_mc_sync(new_active->dev, bond->dev);
618                 netif_addr_unlock_bh(bond->dev);
619         }
620 }
621 
622 /**
623  * bond_set_dev_addr - clone slave's address to bond
624  * @bond_dev: bond net device
625  * @slave_dev: slave net device
626  *
627  * Should be called with RTNL held.
628  */
629 static void bond_set_dev_addr(struct net_device *bond_dev,
630                               struct net_device *slave_dev)
631 {
632         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
633                  bond_dev, slave_dev, slave_dev->addr_len);
634         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
635         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
636         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
637 }
638 
639 /*
640  * bond_do_fail_over_mac
641  *
642  * Perform special MAC address swapping for fail_over_mac settings
643  *
644  * Called with RTNL, curr_slave_lock for write_bh.
645  */
646 static void bond_do_fail_over_mac(struct bonding *bond,
647                                   struct slave *new_active,
648                                   struct slave *old_active)
649         __releases(&bond->curr_slave_lock)
650         __acquires(&bond->curr_slave_lock)
651 {
652         u8 tmp_mac[ETH_ALEN];
653         struct sockaddr saddr;
654         int rv;
655 
656         switch (bond->params.fail_over_mac) {
657         case BOND_FOM_ACTIVE:
658                 if (new_active) {
659                         write_unlock_bh(&bond->curr_slave_lock);
660                         bond_set_dev_addr(bond->dev, new_active->dev);
661                         write_lock_bh(&bond->curr_slave_lock);
662                 }
663                 break;
664         case BOND_FOM_FOLLOW:
665                 /*
666                  * if new_active && old_active, swap them
667                  * if just old_active, do nothing (going to no active slave)
668                  * if just new_active, set new_active to bond's MAC
669                  */
670                 if (!new_active)
671                         return;
672 
673                 write_unlock_bh(&bond->curr_slave_lock);
674 
675                 if (old_active) {
676                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
677                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
678                                ETH_ALEN);
679                         saddr.sa_family = new_active->dev->type;
680                 } else {
681                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
682                         saddr.sa_family = bond->dev->type;
683                 }
684 
685                 rv = dev_set_mac_address(new_active->dev, &saddr);
686                 if (rv) {
687                         pr_err("%s: Error %d setting MAC of slave %s\n",
688                                bond->dev->name, -rv, new_active->dev->name);
689                         goto out;
690                 }
691 
692                 if (!old_active)
693                         goto out;
694 
695                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
696                 saddr.sa_family = old_active->dev->type;
697 
698                 rv = dev_set_mac_address(old_active->dev, &saddr);
699                 if (rv)
700                         pr_err("%s: Error %d setting MAC of slave %s\n",
701                                bond->dev->name, -rv, new_active->dev->name);
702 out:
703                 write_lock_bh(&bond->curr_slave_lock);
704                 break;
705         default:
706                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
707                        bond->dev->name, bond->params.fail_over_mac);
708                 break;
709         }
710 
711 }
712 
713 static bool bond_should_change_active(struct bonding *bond)
714 {
715         struct slave *prim = bond->primary_slave;
716         struct slave *curr = bond->curr_active_slave;
717 
718         if (!prim || !curr || curr->link != BOND_LINK_UP)
719                 return true;
720         if (bond->force_primary) {
721                 bond->force_primary = false;
722                 return true;
723         }
724         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
725             (prim->speed < curr->speed ||
726              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
727                 return false;
728         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
729                 return false;
730         return true;
731 }
732 
733 /**
734  * find_best_interface - select the best available slave to be the active one
735  * @bond: our bonding struct
736  */
737 static struct slave *bond_find_best_slave(struct bonding *bond)
738 {
739         struct slave *slave, *bestslave = NULL;
740         struct list_head *iter;
741         int mintime = bond->params.updelay;
742 
743         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
744             bond_should_change_active(bond))
745                 return bond->primary_slave;
746 
747         bond_for_each_slave(bond, slave, iter) {
748                 if (slave->link == BOND_LINK_UP)
749                         return slave;
750                 if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
751                     slave->delay < mintime) {
752                         mintime = slave->delay;
753                         bestslave = slave;
754                 }
755         }
756 
757         return bestslave;
758 }
759 
760 static bool bond_should_notify_peers(struct bonding *bond)
761 {
762         struct slave *slave;
763 
764         rcu_read_lock();
765         slave = rcu_dereference(bond->curr_active_slave);
766         rcu_read_unlock();
767 
768         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
769                  bond->dev->name, slave ? slave->dev->name : "NULL");
770 
771         if (!slave || !bond->send_peer_notif ||
772             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
773                 return false;
774 
775         return true;
776 }
777 
778 /**
779  * change_active_interface - change the active slave into the specified one
780  * @bond: our bonding struct
781  * @new: the new slave to make the active one
782  *
783  * Set the new slave to the bond's settings and unset them on the old
784  * curr_active_slave.
785  * Setting include flags, mc-list, promiscuity, allmulti, etc.
786  *
787  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
788  * because it is apparently the best available slave we have, even though its
789  * updelay hasn't timed out yet.
790  *
791  * If new_active is not NULL, caller must hold curr_slave_lock for write_bh.
792  */
793 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
794 {
795         struct slave *old_active = bond->curr_active_slave;
796 
797         if (old_active == new_active)
798                 return;
799 
800         if (new_active) {
801                 new_active->jiffies = jiffies;
802 
803                 if (new_active->link == BOND_LINK_BACK) {
804                         if (USES_PRIMARY(bond->params.mode)) {
805                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
806                                         bond->dev->name, new_active->dev->name,
807                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
808                         }
809 
810                         new_active->delay = 0;
811                         new_active->link = BOND_LINK_UP;
812 
813                         if (bond->params.mode == BOND_MODE_8023AD)
814                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
815 
816                         if (bond_is_lb(bond))
817                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
818                 } else {
819                         if (USES_PRIMARY(bond->params.mode)) {
820                                 pr_info("%s: making interface %s the new active one.\n",
821                                         bond->dev->name, new_active->dev->name);
822                         }
823                 }
824         }
825 
826         if (USES_PRIMARY(bond->params.mode))
827                 bond_hw_addr_swap(bond, new_active, old_active);
828 
829         if (bond_is_lb(bond)) {
830                 bond_alb_handle_active_change(bond, new_active);
831                 if (old_active)
832                         bond_set_slave_inactive_flags(old_active,
833                                                       BOND_SLAVE_NOTIFY_NOW);
834                 if (new_active)
835                         bond_set_slave_active_flags(new_active,
836                                                     BOND_SLAVE_NOTIFY_NOW);
837         } else {
838                 rcu_assign_pointer(bond->curr_active_slave, new_active);
839         }
840 
841         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
842                 if (old_active)
843                         bond_set_slave_inactive_flags(old_active,
844                                                       BOND_SLAVE_NOTIFY_NOW);
845 
846                 if (new_active) {
847                         bool should_notify_peers = false;
848 
849                         bond_set_slave_active_flags(new_active,
850                                                     BOND_SLAVE_NOTIFY_NOW);
851 
852                         if (bond->params.fail_over_mac)
853                                 bond_do_fail_over_mac(bond, new_active,
854                                                       old_active);
855 
856                         if (netif_running(bond->dev)) {
857                                 bond->send_peer_notif =
858                                         bond->params.num_peer_notif;
859                                 should_notify_peers =
860                                         bond_should_notify_peers(bond);
861                         }
862 
863                         write_unlock_bh(&bond->curr_slave_lock);
864 
865                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
866                         if (should_notify_peers)
867                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
868                                                          bond->dev);
869 
870                         write_lock_bh(&bond->curr_slave_lock);
871                 }
872         }
873 
874         /* resend IGMP joins since active slave has changed or
875          * all were sent on curr_active_slave.
876          * resend only if bond is brought up with the affected
877          * bonding modes and the retransmission is enabled */
878         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
879             ((USES_PRIMARY(bond->params.mode) && new_active) ||
880              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
881                 bond->igmp_retrans = bond->params.resend_igmp;
882                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
883         }
884 }
885 
886 /**
887  * bond_select_active_slave - select a new active slave, if needed
888  * @bond: our bonding struct
889  *
890  * This functions should be called when one of the following occurs:
891  * - The old curr_active_slave has been released or lost its link.
892  * - The primary_slave has got its link back.
893  * - A slave has got its link back and there's no old curr_active_slave.
894  *
895  * Caller must hold curr_slave_lock for write_bh.
896  */
897 void bond_select_active_slave(struct bonding *bond)
898 {
899         struct slave *best_slave;
900         int rv;
901 
902         best_slave = bond_find_best_slave(bond);
903         if (best_slave != bond->curr_active_slave) {
904                 bond_change_active_slave(bond, best_slave);
905                 rv = bond_set_carrier(bond);
906                 if (!rv)
907                         return;
908 
909                 if (netif_carrier_ok(bond->dev)) {
910                         pr_info("%s: first active interface up!\n",
911                                 bond->dev->name);
912                 } else {
913                         pr_info("%s: now running without any active interface !\n",
914                                 bond->dev->name);
915                 }
916         }
917 }
918 
919 #ifdef CONFIG_NET_POLL_CONTROLLER
920 static inline int slave_enable_netpoll(struct slave *slave)
921 {
922         struct netpoll *np;
923         int err = 0;
924 
925         np = kzalloc(sizeof(*np), GFP_ATOMIC);
926         err = -ENOMEM;
927         if (!np)
928                 goto out;
929 
930         err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
931         if (err) {
932                 kfree(np);
933                 goto out;
934         }
935         slave->np = np;
936 out:
937         return err;
938 }
939 static inline void slave_disable_netpoll(struct slave *slave)
940 {
941         struct netpoll *np = slave->np;
942 
943         if (!np)
944                 return;
945 
946         slave->np = NULL;
947         __netpoll_free_async(np);
948 }
949 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
950 {
951         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
952                 return false;
953         if (!slave_dev->netdev_ops->ndo_poll_controller)
954                 return false;
955         return true;
956 }
957 
958 static void bond_poll_controller(struct net_device *bond_dev)
959 {
960 }
961 
962 static void bond_netpoll_cleanup(struct net_device *bond_dev)
963 {
964         struct bonding *bond = netdev_priv(bond_dev);
965         struct list_head *iter;
966         struct slave *slave;
967 
968         bond_for_each_slave(bond, slave, iter)
969                 if (IS_UP(slave->dev))
970                         slave_disable_netpoll(slave);
971 }
972 
973 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
974 {
975         struct bonding *bond = netdev_priv(dev);
976         struct list_head *iter;
977         struct slave *slave;
978         int err = 0;
979 
980         bond_for_each_slave(bond, slave, iter) {
981                 err = slave_enable_netpoll(slave);
982                 if (err) {
983                         bond_netpoll_cleanup(dev);
984                         break;
985                 }
986         }
987         return err;
988 }
989 #else
990 static inline int slave_enable_netpoll(struct slave *slave)
991 {
992         return 0;
993 }
994 static inline void slave_disable_netpoll(struct slave *slave)
995 {
996 }
997 static void bond_netpoll_cleanup(struct net_device *bond_dev)
998 {
999 }
1000 #endif
1001 
1002 /*---------------------------------- IOCTL ----------------------------------*/
1003 
1004 static netdev_features_t bond_fix_features(struct net_device *dev,
1005                                            netdev_features_t features)
1006 {
1007         struct bonding *bond = netdev_priv(dev);
1008         struct list_head *iter;
1009         netdev_features_t mask;
1010         struct slave *slave;
1011 
1012         if (!bond_has_slaves(bond)) {
1013                 /* Disable adding VLANs to empty bond. But why? --mq */
1014                 features |= NETIF_F_VLAN_CHALLENGED;
1015                 return features;
1016         }
1017 
1018         mask = features;
1019         features &= ~NETIF_F_ONE_FOR_ALL;
1020         features |= NETIF_F_ALL_FOR_ALL;
1021 
1022         bond_for_each_slave(bond, slave, iter) {
1023                 features = netdev_increment_features(features,
1024                                                      slave->dev->features,
1025                                                      mask);
1026         }
1027         features = netdev_add_tso_features(features, mask);
1028 
1029         return features;
1030 }
1031 
1032 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1033                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1034                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1035 
1036 static void bond_compute_features(struct bonding *bond)
1037 {
1038         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1039         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1040         struct net_device *bond_dev = bond->dev;
1041         struct list_head *iter;
1042         struct slave *slave;
1043         unsigned short max_hard_header_len = ETH_HLEN;
1044         unsigned int gso_max_size = GSO_MAX_SIZE;
1045         u16 gso_max_segs = GSO_MAX_SEGS;
1046 
1047         if (!bond_has_slaves(bond))
1048                 goto done;
1049 
1050         bond_for_each_slave(bond, slave, iter) {
1051                 vlan_features = netdev_increment_features(vlan_features,
1052                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1053 
1054                 dst_release_flag &= slave->dev->priv_flags;
1055                 if (slave->dev->hard_header_len > max_hard_header_len)
1056                         max_hard_header_len = slave->dev->hard_header_len;
1057 
1058                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1059                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1060         }
1061 
1062 done:
1063         bond_dev->vlan_features = vlan_features;
1064         bond_dev->hard_header_len = max_hard_header_len;
1065         bond_dev->gso_max_segs = gso_max_segs;
1066         netif_set_gso_max_size(bond_dev, gso_max_size);
1067 
1068         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1069         bond_dev->priv_flags = flags | dst_release_flag;
1070 
1071         netdev_change_features(bond_dev);
1072 }
1073 
1074 static void bond_setup_by_slave(struct net_device *bond_dev,
1075                                 struct net_device *slave_dev)
1076 {
1077         bond_dev->header_ops        = slave_dev->header_ops;
1078 
1079         bond_dev->type              = slave_dev->type;
1080         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1081         bond_dev->addr_len          = slave_dev->addr_len;
1082 
1083         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1084                 slave_dev->addr_len);
1085 }
1086 
1087 /* On bonding slaves other than the currently active slave, suppress
1088  * duplicates except for alb non-mcast/bcast.
1089  */
1090 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1091                                             struct slave *slave,
1092                                             struct bonding *bond)
1093 {
1094         if (bond_is_slave_inactive(slave)) {
1095                 if (bond->params.mode == BOND_MODE_ALB &&
1096                     skb->pkt_type != PACKET_BROADCAST &&
1097                     skb->pkt_type != PACKET_MULTICAST)
1098                         return false;
1099                 return true;
1100         }
1101         return false;
1102 }
1103 
1104 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1105 {
1106         struct sk_buff *skb = *pskb;
1107         struct slave *slave;
1108         struct bonding *bond;
1109         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1110                           struct slave *);
1111         int ret = RX_HANDLER_ANOTHER;
1112 
1113         skb = skb_share_check(skb, GFP_ATOMIC);
1114         if (unlikely(!skb))
1115                 return RX_HANDLER_CONSUMED;
1116 
1117         *pskb = skb;
1118 
1119         slave = bond_slave_get_rcu(skb->dev);
1120         bond = slave->bond;
1121 
1122         if (bond->params.arp_interval)
1123                 slave->dev->last_rx = jiffies;
1124 
1125         recv_probe = ACCESS_ONCE(bond->recv_probe);
1126         if (recv_probe) {
1127                 ret = recv_probe(skb, bond, slave);
1128                 if (ret == RX_HANDLER_CONSUMED) {
1129                         consume_skb(skb);
1130                         return ret;
1131                 }
1132         }
1133 
1134         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1135                 return RX_HANDLER_EXACT;
1136         }
1137 
1138         skb->dev = bond->dev;
1139 
1140         if (bond->params.mode == BOND_MODE_ALB &&
1141             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1142             skb->pkt_type == PACKET_HOST) {
1143 
1144                 if (unlikely(skb_cow_head(skb,
1145                                           skb->data - skb_mac_header(skb)))) {
1146                         kfree_skb(skb);
1147                         return RX_HANDLER_CONSUMED;
1148                 }
1149                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1150         }
1151 
1152         return ret;
1153 }
1154 
1155 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1156                                       struct net_device *slave_dev,
1157                                       struct slave *slave)
1158 {
1159         int err;
1160 
1161         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1162         if (err)
1163                 return err;
1164         slave_dev->flags |= IFF_SLAVE;
1165         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1166         return 0;
1167 }
1168 
1169 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1170                                   struct net_device *slave_dev)
1171 {
1172         netdev_upper_dev_unlink(slave_dev, bond_dev);
1173         slave_dev->flags &= ~IFF_SLAVE;
1174         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1175 }
1176 
1177 /* enslave device <slave> to bond device <master> */
1178 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1179 {
1180         struct bonding *bond = netdev_priv(bond_dev);
1181         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1182         struct slave *new_slave = NULL, *prev_slave;
1183         struct sockaddr addr;
1184         int link_reporting;
1185         int res = 0, i;
1186 
1187         if (!bond->params.use_carrier &&
1188             slave_dev->ethtool_ops->get_link == NULL &&
1189             slave_ops->ndo_do_ioctl == NULL) {
1190                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1191                            bond_dev->name, slave_dev->name);
1192         }
1193 
1194         /* already enslaved */
1195         if (slave_dev->flags & IFF_SLAVE) {
1196                 pr_debug("Error, Device was already enslaved\n");
1197                 return -EBUSY;
1198         }
1199 
1200         if (bond_dev == slave_dev) {
1201                 pr_err("%s: cannot enslave bond to itself.\n", bond_dev->name);
1202                 return -EPERM;
1203         }
1204 
1205         /* vlan challenged mutual exclusion */
1206         /* no need to lock since we're protected by rtnl_lock */
1207         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1208                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1209                 if (vlan_uses_dev(bond_dev)) {
1210                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1211                                bond_dev->name, slave_dev->name, bond_dev->name);
1212                         return -EPERM;
1213                 } else {
1214                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1215                                    bond_dev->name, slave_dev->name,
1216                                    slave_dev->name, bond_dev->name);
1217                 }
1218         } else {
1219                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1220         }
1221 
1222         /*
1223          * Old ifenslave binaries are no longer supported.  These can
1224          * be identified with moderate accuracy by the state of the slave:
1225          * the current ifenslave will set the interface down prior to
1226          * enslaving it; the old ifenslave will not.
1227          */
1228         if ((slave_dev->flags & IFF_UP)) {
1229                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1230                        slave_dev->name);
1231                 res = -EPERM;
1232                 goto err_undo_flags;
1233         }
1234 
1235         /* set bonding device ether type by slave - bonding netdevices are
1236          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1237          * there is a need to override some of the type dependent attribs/funcs.
1238          *
1239          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1240          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1241          */
1242         if (!bond_has_slaves(bond)) {
1243                 if (bond_dev->type != slave_dev->type) {
1244                         pr_debug("%s: change device type from %d to %d\n",
1245                                  bond_dev->name,
1246                                  bond_dev->type, slave_dev->type);
1247 
1248                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1249                                                        bond_dev);
1250                         res = notifier_to_errno(res);
1251                         if (res) {
1252                                 pr_err("%s: refused to change device type\n",
1253                                        bond_dev->name);
1254                                 res = -EBUSY;
1255                                 goto err_undo_flags;
1256                         }
1257 
1258                         /* Flush unicast and multicast addresses */
1259                         dev_uc_flush(bond_dev);
1260                         dev_mc_flush(bond_dev);
1261 
1262                         if (slave_dev->type != ARPHRD_ETHER)
1263                                 bond_setup_by_slave(bond_dev, slave_dev);
1264                         else {
1265                                 ether_setup(bond_dev);
1266                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1267                         }
1268 
1269                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1270                                                  bond_dev);
1271                 }
1272         } else if (bond_dev->type != slave_dev->type) {
1273                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1274                        slave_dev->name,
1275                        slave_dev->type, bond_dev->type);
1276                 res = -EINVAL;
1277                 goto err_undo_flags;
1278         }
1279 
1280         if (slave_ops->ndo_set_mac_address == NULL) {
1281                 if (!bond_has_slaves(bond)) {
1282                         pr_warn("%s: Warning: The first slave device specified does not support setting the MAC address.\n",
1283                                 bond_dev->name);
1284                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1285                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1286                                 pr_warn("%s: Setting fail_over_mac to active for active-backup mode.\n",
1287                                         bond_dev->name);
1288                         }
1289                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1290                         pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1291                                bond_dev->name);
1292                         res = -EOPNOTSUPP;
1293                         goto err_undo_flags;
1294                 }
1295         }
1296 
1297         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1298 
1299         /* If this is the first slave, then we need to set the master's hardware
1300          * address to be the same as the slave's. */
1301         if (!bond_has_slaves(bond) &&
1302             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1303                 bond_set_dev_addr(bond->dev, slave_dev);
1304 
1305         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1306         if (!new_slave) {
1307                 res = -ENOMEM;
1308                 goto err_undo_flags;
1309         }
1310         /*
1311          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1312          * is set via sysfs or module option if desired.
1313          */
1314         new_slave->queue_id = 0;
1315 
1316         /* Save slave's original mtu and then set it to match the bond */
1317         new_slave->original_mtu = slave_dev->mtu;
1318         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1319         if (res) {
1320                 pr_debug("Error %d calling dev_set_mtu\n", res);
1321                 goto err_free;
1322         }
1323 
1324         /*
1325          * Save slave's original ("permanent") mac address for modes
1326          * that need it, and for restoring it upon release, and then
1327          * set it to the master's address
1328          */
1329         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1330 
1331         if (!bond->params.fail_over_mac ||
1332             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1333                 /*
1334                  * Set slave to master's mac address.  The application already
1335                  * set the master's mac address to that of the first slave
1336                  */
1337                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1338                 addr.sa_family = slave_dev->type;
1339                 res = dev_set_mac_address(slave_dev, &addr);
1340                 if (res) {
1341                         pr_debug("Error %d calling set_mac_address\n", res);
1342                         goto err_restore_mtu;
1343                 }
1344         }
1345 
1346         /* open the slave since the application closed it */
1347         res = dev_open(slave_dev);
1348         if (res) {
1349                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1350                 goto err_restore_mac;
1351         }
1352 
1353         new_slave->bond = bond;
1354         new_slave->dev = slave_dev;
1355         slave_dev->priv_flags |= IFF_BONDING;
1356 
1357         if (bond_is_lb(bond)) {
1358                 /* bond_alb_init_slave() must be called before all other stages since
1359                  * it might fail and we do not want to have to undo everything
1360                  */
1361                 res = bond_alb_init_slave(bond, new_slave);
1362                 if (res)
1363                         goto err_close;
1364         }
1365 
1366         /* If the mode USES_PRIMARY, then the following is handled by
1367          * bond_change_active_slave().
1368          */
1369         if (!USES_PRIMARY(bond->params.mode)) {
1370                 /* set promiscuity level to new slave */
1371                 if (bond_dev->flags & IFF_PROMISC) {
1372                         res = dev_set_promiscuity(slave_dev, 1);
1373                         if (res)
1374                                 goto err_close;
1375                 }
1376 
1377                 /* set allmulti level to new slave */
1378                 if (bond_dev->flags & IFF_ALLMULTI) {
1379                         res = dev_set_allmulti(slave_dev, 1);
1380                         if (res)
1381                                 goto err_close;
1382                 }
1383 
1384                 netif_addr_lock_bh(bond_dev);
1385 
1386                 dev_mc_sync_multiple(slave_dev, bond_dev);
1387                 dev_uc_sync_multiple(slave_dev, bond_dev);
1388 
1389                 netif_addr_unlock_bh(bond_dev);
1390         }
1391 
1392         if (bond->params.mode == BOND_MODE_8023AD) {
1393                 /* add lacpdu mc addr to mc list */
1394                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1395 
1396                 dev_mc_add(slave_dev, lacpdu_multicast);
1397         }
1398 
1399         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1400         if (res) {
1401                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1402                        bond_dev->name, slave_dev->name);
1403                 goto err_close;
1404         }
1405 
1406         prev_slave = bond_last_slave(bond);
1407 
1408         new_slave->delay = 0;
1409         new_slave->link_failure_count = 0;
1410 
1411         bond_update_speed_duplex(new_slave);
1412 
1413         new_slave->last_arp_rx = jiffies -
1414                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1415         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1416                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1417 
1418         if (bond->params.miimon && !bond->params.use_carrier) {
1419                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1420 
1421                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1422                         /*
1423                          * miimon is set but a bonded network driver
1424                          * does not support ETHTOOL/MII and
1425                          * arp_interval is not set.  Note: if
1426                          * use_carrier is enabled, we will never go
1427                          * here (because netif_carrier is always
1428                          * supported); thus, we don't need to change
1429                          * the messages for netif_carrier.
1430                          */
1431                         pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1432                                bond_dev->name, slave_dev->name);
1433                 } else if (link_reporting == -1) {
1434                         /* unable get link status using mii/ethtool */
1435                         pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1436                                    bond_dev->name, slave_dev->name);
1437                 }
1438         }
1439 
1440         /* check for initial state */
1441         if (bond->params.miimon) {
1442                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1443                         if (bond->params.updelay) {
1444                                 new_slave->link = BOND_LINK_BACK;
1445                                 new_slave->delay = bond->params.updelay;
1446                         } else {
1447                                 new_slave->link = BOND_LINK_UP;
1448                         }
1449                 } else {
1450                         new_slave->link = BOND_LINK_DOWN;
1451                 }
1452         } else if (bond->params.arp_interval) {
1453                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1454                         BOND_LINK_UP : BOND_LINK_DOWN);
1455         } else {
1456                 new_slave->link = BOND_LINK_UP;
1457         }
1458 
1459         if (new_slave->link != BOND_LINK_DOWN)
1460                 new_slave->jiffies = jiffies;
1461         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1462                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1463                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1464 
1465         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1466                 /* if there is a primary slave, remember it */
1467                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1468                         bond->primary_slave = new_slave;
1469                         bond->force_primary = true;
1470                 }
1471         }
1472 
1473         switch (bond->params.mode) {
1474         case BOND_MODE_ACTIVEBACKUP:
1475                 bond_set_slave_inactive_flags(new_slave,
1476                                               BOND_SLAVE_NOTIFY_NOW);
1477                 break;
1478         case BOND_MODE_8023AD:
1479                 /* in 802.3ad mode, the internal mechanism
1480                  * will activate the slaves in the selected
1481                  * aggregator
1482                  */
1483                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1484                 /* if this is the first slave */
1485                 if (!prev_slave) {
1486                         SLAVE_AD_INFO(new_slave).id = 1;
1487                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1488                          * can be called only after the mac address of the bond is set
1489                          */
1490                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1491                 } else {
1492                         SLAVE_AD_INFO(new_slave).id =
1493                                 SLAVE_AD_INFO(prev_slave).id + 1;
1494                 }
1495 
1496                 bond_3ad_bind_slave(new_slave);
1497                 break;
1498         case BOND_MODE_TLB:
1499         case BOND_MODE_ALB:
1500                 bond_set_active_slave(new_slave);
1501                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1502                 break;
1503         default:
1504                 pr_debug("This slave is always active in trunk mode\n");
1505 
1506                 /* always active in trunk mode */
1507                 bond_set_active_slave(new_slave);
1508 
1509                 /* In trunking mode there is little meaning to curr_active_slave
1510                  * anyway (it holds no special properties of the bond device),
1511                  * so we can change it without calling change_active_interface()
1512                  */
1513                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1514                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1515 
1516                 break;
1517         } /* switch(bond_mode) */
1518 
1519 #ifdef CONFIG_NET_POLL_CONTROLLER
1520         slave_dev->npinfo = bond->dev->npinfo;
1521         if (slave_dev->npinfo) {
1522                 if (slave_enable_netpoll(new_slave)) {
1523                         pr_info("Error, %s: master_dev is using netpoll, "
1524                                  "but new slave device does not support netpoll.\n",
1525                                  bond_dev->name);
1526                         res = -EBUSY;
1527                         goto err_detach;
1528                 }
1529         }
1530 #endif
1531 
1532         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1533                                          new_slave);
1534         if (res) {
1535                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1536                 goto err_detach;
1537         }
1538 
1539         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1540         if (res) {
1541                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1542                 goto err_unregister;
1543         }
1544 
1545         res = bond_sysfs_slave_add(new_slave);
1546         if (res) {
1547                 pr_debug("Error %d calling bond_sysfs_slave_add\n", res);
1548                 goto err_upper_unlink;
1549         }
1550 
1551         bond->slave_cnt++;
1552         bond_compute_features(bond);
1553         bond_set_carrier(bond);
1554 
1555         if (USES_PRIMARY(bond->params.mode)) {
1556                 block_netpoll_tx();
1557                 write_lock_bh(&bond->curr_slave_lock);
1558                 bond_select_active_slave(bond);
1559                 write_unlock_bh(&bond->curr_slave_lock);
1560                 unblock_netpoll_tx();
1561         }
1562 
1563         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1564                 bond_dev->name, slave_dev->name,
1565                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1566                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1567 
1568         /* enslave is successful */
1569         return 0;
1570 
1571 /* Undo stages on error */
1572 err_upper_unlink:
1573         bond_upper_dev_unlink(bond_dev, slave_dev);
1574 
1575 err_unregister:
1576         netdev_rx_handler_unregister(slave_dev);
1577 
1578 err_detach:
1579         if (!USES_PRIMARY(bond->params.mode))
1580                 bond_hw_addr_flush(bond_dev, slave_dev);
1581 
1582         vlan_vids_del_by_dev(slave_dev, bond_dev);
1583         if (bond->primary_slave == new_slave)
1584                 bond->primary_slave = NULL;
1585         if (bond->curr_active_slave == new_slave) {
1586                 block_netpoll_tx();
1587                 write_lock_bh(&bond->curr_slave_lock);
1588                 bond_change_active_slave(bond, NULL);
1589                 bond_select_active_slave(bond);
1590                 write_unlock_bh(&bond->curr_slave_lock);
1591                 unblock_netpoll_tx();
1592         }
1593         slave_disable_netpoll(new_slave);
1594 
1595 err_close:
1596         slave_dev->priv_flags &= ~IFF_BONDING;
1597         dev_close(slave_dev);
1598 
1599 err_restore_mac:
1600         if (!bond->params.fail_over_mac ||
1601             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1602                 /* XXX TODO - fom follow mode needs to change master's
1603                  * MAC if this slave's MAC is in use by the bond, or at
1604                  * least print a warning.
1605                  */
1606                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1607                 addr.sa_family = slave_dev->type;
1608                 dev_set_mac_address(slave_dev, &addr);
1609         }
1610 
1611 err_restore_mtu:
1612         dev_set_mtu(slave_dev, new_slave->original_mtu);
1613 
1614 err_free:
1615         kfree(new_slave);
1616 
1617 err_undo_flags:
1618         /* Enslave of first slave has failed and we need to fix master's mac */
1619         if (!bond_has_slaves(bond) &&
1620             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1621                 eth_hw_addr_random(bond_dev);
1622 
1623         return res;
1624 }
1625 
1626 /*
1627  * Try to release the slave device <slave> from the bond device <master>
1628  * It is legal to access curr_active_slave without a lock because all the function
1629  * is write-locked. If "all" is true it means that the function is being called
1630  * while destroying a bond interface and all slaves are being released.
1631  *
1632  * The rules for slave state should be:
1633  *   for Active/Backup:
1634  *     Active stays on all backups go down
1635  *   for Bonded connections:
1636  *     The first up interface should be left on and all others downed.
1637  */
1638 static int __bond_release_one(struct net_device *bond_dev,
1639                               struct net_device *slave_dev,
1640                               bool all)
1641 {
1642         struct bonding *bond = netdev_priv(bond_dev);
1643         struct slave *slave, *oldcurrent;
1644         struct sockaddr addr;
1645         int old_flags = bond_dev->flags;
1646         netdev_features_t old_features = bond_dev->features;
1647 
1648         /* slave is not a slave or master is not master of this slave */
1649         if (!(slave_dev->flags & IFF_SLAVE) ||
1650             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1651                 pr_err("%s: Error: cannot release %s.\n",
1652                        bond_dev->name, slave_dev->name);
1653                 return -EINVAL;
1654         }
1655 
1656         block_netpoll_tx();
1657 
1658         slave = bond_get_slave_by_dev(bond, slave_dev);
1659         if (!slave) {
1660                 /* not a slave of this bond */
1661                 pr_info("%s: %s not enslaved\n",
1662                         bond_dev->name, slave_dev->name);
1663                 unblock_netpoll_tx();
1664                 return -EINVAL;
1665         }
1666 
1667         bond_sysfs_slave_del(slave);
1668 
1669         bond_upper_dev_unlink(bond_dev, slave_dev);
1670         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1671          * for this slave anymore.
1672          */
1673         netdev_rx_handler_unregister(slave_dev);
1674         write_lock_bh(&bond->lock);
1675 
1676         /* Inform AD package of unbinding of slave. */
1677         if (bond->params.mode == BOND_MODE_8023AD)
1678                 bond_3ad_unbind_slave(slave);
1679 
1680         write_unlock_bh(&bond->lock);
1681 
1682         pr_info("%s: releasing %s interface %s\n",
1683                 bond_dev->name,
1684                 bond_is_active_slave(slave) ? "active" : "backup",
1685                 slave_dev->name);
1686 
1687         oldcurrent = bond->curr_active_slave;
1688 
1689         bond->current_arp_slave = NULL;
1690 
1691         if (!all && (!bond->params.fail_over_mac ||
1692                      bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
1693                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1694                     bond_has_slaves(bond))
1695                         pr_warn("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1696                                    bond_dev->name, slave_dev->name,
1697                                    slave->perm_hwaddr,
1698                                    bond_dev->name, slave_dev->name);
1699         }
1700 
1701         if (bond->primary_slave == slave)
1702                 bond->primary_slave = NULL;
1703 
1704         if (oldcurrent == slave) {
1705                 write_lock_bh(&bond->curr_slave_lock);
1706                 bond_change_active_slave(bond, NULL);
1707                 write_unlock_bh(&bond->curr_slave_lock);
1708         }
1709 
1710         if (bond_is_lb(bond)) {
1711                 /* Must be called only after the slave has been
1712                  * detached from the list and the curr_active_slave
1713                  * has been cleared (if our_slave == old_current),
1714                  * but before a new active slave is selected.
1715                  */
1716                 bond_alb_deinit_slave(bond, slave);
1717         }
1718 
1719         if (all) {
1720                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1721         } else if (oldcurrent == slave) {
1722                 /*
1723                  * Note that we hold RTNL over this sequence, so there
1724                  * is no concern that another slave add/remove event
1725                  * will interfere.
1726                  */
1727                 write_lock_bh(&bond->curr_slave_lock);
1728 
1729                 bond_select_active_slave(bond);
1730 
1731                 write_unlock_bh(&bond->curr_slave_lock);
1732         }
1733 
1734         if (!bond_has_slaves(bond)) {
1735                 bond_set_carrier(bond);
1736                 eth_hw_addr_random(bond_dev);
1737 
1738                 if (vlan_uses_dev(bond_dev)) {
1739                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1740                                    bond_dev->name, bond_dev->name);
1741                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1742                                    bond_dev->name);
1743                 }
1744         }
1745 
1746         unblock_netpoll_tx();
1747         synchronize_rcu();
1748         bond->slave_cnt--;
1749 
1750         if (!bond_has_slaves(bond)) {
1751                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1752                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1753         }
1754 
1755         bond_compute_features(bond);
1756         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1757             (old_features & NETIF_F_VLAN_CHALLENGED))
1758                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1759                         bond_dev->name, slave_dev->name, bond_dev->name);
1760 
1761         /* must do this from outside any spinlocks */
1762         vlan_vids_del_by_dev(slave_dev, bond_dev);
1763 
1764         /* If the mode USES_PRIMARY, then this cases was handled above by
1765          * bond_change_active_slave(..., NULL)
1766          */
1767         if (!USES_PRIMARY(bond->params.mode)) {
1768                 /* unset promiscuity level from slave
1769                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1770                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1771                  * value of that flag before that change, as that was the value
1772                  * when this slave was attached, so we cache at the start of the
1773                  * function and use it here. Same goes for ALLMULTI below
1774                  */
1775                 if (old_flags & IFF_PROMISC)
1776                         dev_set_promiscuity(slave_dev, -1);
1777 
1778                 /* unset allmulti level from slave */
1779                 if (old_flags & IFF_ALLMULTI)
1780                         dev_set_allmulti(slave_dev, -1);
1781 
1782                 bond_hw_addr_flush(bond_dev, slave_dev);
1783         }
1784 
1785         slave_disable_netpoll(slave);
1786 
1787         /* close slave before restoring its mac address */
1788         dev_close(slave_dev);
1789 
1790         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1791             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1792                 /* restore original ("permanent") mac address */
1793                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1794                 addr.sa_family = slave_dev->type;
1795                 dev_set_mac_address(slave_dev, &addr);
1796         }
1797 
1798         dev_set_mtu(slave_dev, slave->original_mtu);
1799 
1800         slave_dev->priv_flags &= ~IFF_BONDING;
1801 
1802         kfree(slave);
1803 
1804         return 0;  /* deletion OK */
1805 }
1806 
1807 /* A wrapper used because of ndo_del_link */
1808 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1809 {
1810         return __bond_release_one(bond_dev, slave_dev, false);
1811 }
1812 
1813 /*
1814 * First release a slave and then destroy the bond if no more slaves are left.
1815 * Must be under rtnl_lock when this function is called.
1816 */
1817 static int  bond_release_and_destroy(struct net_device *bond_dev,
1818                                      struct net_device *slave_dev)
1819 {
1820         struct bonding *bond = netdev_priv(bond_dev);
1821         int ret;
1822 
1823         ret = bond_release(bond_dev, slave_dev);
1824         if (ret == 0 && !bond_has_slaves(bond)) {
1825                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1826                 pr_info("%s: destroying bond %s.\n",
1827                         bond_dev->name, bond_dev->name);
1828                 unregister_netdevice(bond_dev);
1829         }
1830         return ret;
1831 }
1832 
1833 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1834 {
1835         struct bonding *bond = netdev_priv(bond_dev);
1836 
1837         info->bond_mode = bond->params.mode;
1838         info->miimon = bond->params.miimon;
1839 
1840         read_lock(&bond->lock);
1841         info->num_slaves = bond->slave_cnt;
1842         read_unlock(&bond->lock);
1843 
1844         return 0;
1845 }
1846 
1847 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1848 {
1849         struct bonding *bond = netdev_priv(bond_dev);
1850         struct list_head *iter;
1851         int i = 0, res = -ENODEV;
1852         struct slave *slave;
1853 
1854         read_lock(&bond->lock);
1855         bond_for_each_slave(bond, slave, iter) {
1856                 if (i++ == (int)info->slave_id) {
1857                         res = 0;
1858                         strcpy(info->slave_name, slave->dev->name);
1859                         info->link = slave->link;
1860                         info->state = bond_slave_state(slave);
1861                         info->link_failure_count = slave->link_failure_count;
1862                         break;
1863                 }
1864         }
1865         read_unlock(&bond->lock);
1866 
1867         return res;
1868 }
1869 
1870 /*-------------------------------- Monitoring -------------------------------*/
1871 
1872 
1873 static int bond_miimon_inspect(struct bonding *bond)
1874 {
1875         int link_state, commit = 0;
1876         struct list_head *iter;
1877         struct slave *slave;
1878         bool ignore_updelay;
1879 
1880         ignore_updelay = !bond->curr_active_slave ? true : false;
1881 
1882         bond_for_each_slave_rcu(bond, slave, iter) {
1883                 slave->new_link = BOND_LINK_NOCHANGE;
1884 
1885                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1886 
1887                 switch (slave->link) {
1888                 case BOND_LINK_UP:
1889                         if (link_state)
1890                                 continue;
1891 
1892                         slave->link = BOND_LINK_FAIL;
1893                         slave->delay = bond->params.downdelay;
1894                         if (slave->delay) {
1895                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
1896                                         bond->dev->name,
1897                                         (bond->params.mode ==
1898                                          BOND_MODE_ACTIVEBACKUP) ?
1899                                         (bond_is_active_slave(slave) ?
1900                                          "active " : "backup ") : "",
1901                                         slave->dev->name,
1902                                         bond->params.downdelay * bond->params.miimon);
1903                         }
1904                         /*FALLTHRU*/
1905                 case BOND_LINK_FAIL:
1906                         if (link_state) {
1907                                 /*
1908                                  * recovered before downdelay expired
1909                                  */
1910                                 slave->link = BOND_LINK_UP;
1911                                 slave->jiffies = jiffies;
1912                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
1913                                         bond->dev->name,
1914                                         (bond->params.downdelay - slave->delay) *
1915                                         bond->params.miimon,
1916                                         slave->dev->name);
1917                                 continue;
1918                         }
1919 
1920                         if (slave->delay <= 0) {
1921                                 slave->new_link = BOND_LINK_DOWN;
1922                                 commit++;
1923                                 continue;
1924                         }
1925 
1926                         slave->delay--;
1927                         break;
1928 
1929                 case BOND_LINK_DOWN:
1930                         if (!link_state)
1931                                 continue;
1932 
1933                         slave->link = BOND_LINK_BACK;
1934                         slave->delay = bond->params.updelay;
1935 
1936                         if (slave->delay) {
1937                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
1938                                         bond->dev->name, slave->dev->name,
1939                                         ignore_updelay ? 0 :
1940                                         bond->params.updelay *
1941                                         bond->params.miimon);
1942                         }
1943                         /*FALLTHRU*/
1944                 case BOND_LINK_BACK:
1945                         if (!link_state) {
1946                                 slave->link = BOND_LINK_DOWN;
1947                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
1948                                         bond->dev->name,
1949                                         (bond->params.updelay - slave->delay) *
1950                                         bond->params.miimon,
1951                                         slave->dev->name);
1952 
1953                                 continue;
1954                         }
1955 
1956                         if (ignore_updelay)
1957                                 slave->delay = 0;
1958 
1959                         if (slave->delay <= 0) {
1960                                 slave->new_link = BOND_LINK_UP;
1961                                 commit++;
1962                                 ignore_updelay = false;
1963                                 continue;
1964                         }
1965 
1966                         slave->delay--;
1967                         break;
1968                 }
1969         }
1970 
1971         return commit;
1972 }
1973 
1974 static void bond_miimon_commit(struct bonding *bond)
1975 {
1976         struct list_head *iter;
1977         struct slave *slave;
1978 
1979         bond_for_each_slave(bond, slave, iter) {
1980                 switch (slave->new_link) {
1981                 case BOND_LINK_NOCHANGE:
1982                         continue;
1983 
1984                 case BOND_LINK_UP:
1985                         slave->link = BOND_LINK_UP;
1986                         slave->jiffies = jiffies;
1987 
1988                         if (bond->params.mode == BOND_MODE_8023AD) {
1989                                 /* prevent it from being the active one */
1990                                 bond_set_backup_slave(slave);
1991                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1992                                 /* make it immediately active */
1993                                 bond_set_active_slave(slave);
1994                         } else if (slave != bond->primary_slave) {
1995                                 /* prevent it from being the active one */
1996                                 bond_set_backup_slave(slave);
1997                         }
1998 
1999                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2000                                 bond->dev->name, slave->dev->name,
2001                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2002                                 slave->duplex ? "full" : "half");
2003 
2004                         /* notify ad that the link status has changed */
2005                         if (bond->params.mode == BOND_MODE_8023AD)
2006                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2007 
2008                         if (bond_is_lb(bond))
2009                                 bond_alb_handle_link_change(bond, slave,
2010                                                             BOND_LINK_UP);
2011 
2012                         if (!bond->curr_active_slave ||
2013                             (slave == bond->primary_slave))
2014                                 goto do_failover;
2015 
2016                         continue;
2017 
2018                 case BOND_LINK_DOWN:
2019                         if (slave->link_failure_count < UINT_MAX)
2020                                 slave->link_failure_count++;
2021 
2022                         slave->link = BOND_LINK_DOWN;
2023 
2024                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2025                             bond->params.mode == BOND_MODE_8023AD)
2026                                 bond_set_slave_inactive_flags(slave,
2027                                                               BOND_SLAVE_NOTIFY_NOW);
2028 
2029                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2030                                 bond->dev->name, slave->dev->name);
2031 
2032                         if (bond->params.mode == BOND_MODE_8023AD)
2033                                 bond_3ad_handle_link_change(slave,
2034                                                             BOND_LINK_DOWN);
2035 
2036                         if (bond_is_lb(bond))
2037                                 bond_alb_handle_link_change(bond, slave,
2038                                                             BOND_LINK_DOWN);
2039 
2040                         if (slave == bond->curr_active_slave)
2041                                 goto do_failover;
2042 
2043                         continue;
2044 
2045                 default:
2046                         pr_err("%s: invalid new link %d on slave %s\n",
2047                                bond->dev->name, slave->new_link,
2048                                slave->dev->name);
2049                         slave->new_link = BOND_LINK_NOCHANGE;
2050 
2051                         continue;
2052                 }
2053 
2054 do_failover:
2055                 ASSERT_RTNL();
2056                 block_netpoll_tx();
2057                 write_lock_bh(&bond->curr_slave_lock);
2058                 bond_select_active_slave(bond);
2059                 write_unlock_bh(&bond->curr_slave_lock);
2060                 unblock_netpoll_tx();
2061         }
2062 
2063         bond_set_carrier(bond);
2064 }
2065 
2066 /*
2067  * bond_mii_monitor
2068  *
2069  * Really a wrapper that splits the mii monitor into two phases: an
2070  * inspection, then (if inspection indicates something needs to be done)
2071  * an acquisition of appropriate locks followed by a commit phase to
2072  * implement whatever link state changes are indicated.
2073  */
2074 static void bond_mii_monitor(struct work_struct *work)
2075 {
2076         struct bonding *bond = container_of(work, struct bonding,
2077                                             mii_work.work);
2078         bool should_notify_peers = false;
2079         unsigned long delay;
2080 
2081         delay = msecs_to_jiffies(bond->params.miimon);
2082 
2083         if (!bond_has_slaves(bond))
2084                 goto re_arm;
2085 
2086         rcu_read_lock();
2087 
2088         should_notify_peers = bond_should_notify_peers(bond);
2089 
2090         if (bond_miimon_inspect(bond)) {
2091                 rcu_read_unlock();
2092 
2093                 /* Race avoidance with bond_close cancel of workqueue */
2094                 if (!rtnl_trylock()) {
2095                         delay = 1;
2096                         should_notify_peers = false;
2097                         goto re_arm;
2098                 }
2099 
2100                 bond_miimon_commit(bond);
2101 
2102                 rtnl_unlock();  /* might sleep, hold no other locks */
2103         } else
2104                 rcu_read_unlock();
2105 
2106 re_arm:
2107         if (bond->params.miimon)
2108                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2109 
2110         if (should_notify_peers) {
2111                 if (!rtnl_trylock())
2112                         return;
2113                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2114                 rtnl_unlock();
2115         }
2116 }
2117 
2118 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2119 {
2120         struct net_device *upper;
2121         struct list_head *iter;
2122         bool ret = false;
2123 
2124         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2125                 return true;
2126 
2127         rcu_read_lock();
2128         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2129                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2130                         ret = true;
2131                         break;
2132                 }
2133         }
2134         rcu_read_unlock();
2135 
2136         return ret;
2137 }
2138 
2139 /*
2140  * We go to the (large) trouble of VLAN tagging ARP frames because
2141  * switches in VLAN mode (especially if ports are configured as
2142  * "native" to a VLAN) might not pass non-tagged frames.
2143  */
2144 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2145 {
2146         struct sk_buff *skb;
2147 
2148         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2149                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2150 
2151         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2152                          NULL, slave_dev->dev_addr, NULL);
2153 
2154         if (!skb) {
2155                 pr_err("ARP packet allocation failed\n");
2156                 return;
2157         }
2158         if (vlan_id) {
2159                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2160                 if (!skb) {
2161                         pr_err("failed to insert VLAN tag\n");
2162                         return;
2163                 }
2164         }
2165         arp_xmit(skb);
2166 }
2167 
2168 
2169 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2170 {
2171         struct net_device *upper, *vlan_upper;
2172         struct list_head *iter, *vlan_iter;
2173         struct rtable *rt;
2174         __be32 *targets = bond->params.arp_targets, addr;
2175         int i, vlan_id;
2176 
2177         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2178                 pr_debug("basa: target %pI4\n", &targets[i]);
2179 
2180                 /* Find out through which dev should the packet go */
2181                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2182                                      RTO_ONLINK, 0);
2183                 if (IS_ERR(rt)) {
2184                         pr_debug("%s: no route to arp_ip_target %pI4\n",
2185                                  bond->dev->name, &targets[i]);
2186                         continue;
2187                 }
2188 
2189                 vlan_id = 0;
2190 
2191                 /* bond device itself */
2192                 if (rt->dst.dev == bond->dev)
2193                         goto found;
2194 
2195                 rcu_read_lock();
2196                 /* first we search only for vlan devices. for every vlan
2197                  * found we verify its upper dev list, searching for the
2198                  * rt->dst.dev. If found we save the tag of the vlan and
2199                  * proceed to send the packet.
2200                  *
2201                  * TODO: QinQ?
2202                  */
2203                 netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
2204                                                   vlan_iter) {
2205                         if (!is_vlan_dev(vlan_upper))
2206                                 continue;
2207                         netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
2208                                                           iter) {
2209                                 if (upper == rt->dst.dev) {
2210                                         vlan_id = vlan_dev_vlan_id(vlan_upper);
2211                                         rcu_read_unlock();
2212                                         goto found;
2213                                 }
2214                         }
2215                 }
2216 
2217                 /* if the device we're looking for is not on top of any of
2218                  * our upper vlans, then just search for any dev that
2219                  * matches, and in case it's a vlan - save the id
2220                  */
2221                 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2222                         if (upper == rt->dst.dev) {
2223                                 /* if it's a vlan - get its VID */
2224                                 if (is_vlan_dev(upper))
2225                                         vlan_id = vlan_dev_vlan_id(upper);
2226 
2227                                 rcu_read_unlock();
2228                                 goto found;
2229                         }
2230                 }
2231                 rcu_read_unlock();
2232 
2233                 /* Not our device - skip */
2234                 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2235                          bond->dev->name, &targets[i],
2236                          rt->dst.dev ? rt->dst.dev->name : "NULL");
2237 
2238                 ip_rt_put(rt);
2239                 continue;
2240 
2241 found:
2242                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2243                 ip_rt_put(rt);
2244                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2245                               addr, vlan_id);
2246         }
2247 }
2248 
2249 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2250 {
2251         int i;
2252 
2253         if (!sip || !bond_has_this_ip(bond, tip)) {
2254                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2255                 return;
2256         }
2257 
2258         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2259         if (i == -1) {
2260                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2261                 return;
2262         }
2263         slave->last_arp_rx = jiffies;
2264         slave->target_last_arp_rx[i] = jiffies;
2265 }
2266 
2267 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2268                  struct slave *slave)
2269 {
2270         struct arphdr *arp = (struct arphdr *)skb->data;
2271         unsigned char *arp_ptr;
2272         __be32 sip, tip;
2273         int alen;
2274 
2275         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2276                 return RX_HANDLER_ANOTHER;
2277 
2278         read_lock(&bond->lock);
2279 
2280         if (!slave_do_arp_validate(bond, slave))
2281                 goto out_unlock;
2282 
2283         alen = arp_hdr_len(bond->dev);
2284 
2285         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2286                  bond->dev->name, skb->dev->name);
2287 
2288         if (alen > skb_headlen(skb)) {
2289                 arp = kmalloc(alen, GFP_ATOMIC);
2290                 if (!arp)
2291                         goto out_unlock;
2292                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2293                         goto out_unlock;
2294         }
2295 
2296         if (arp->ar_hln != bond->dev->addr_len ||
2297             skb->pkt_type == PACKET_OTHERHOST ||
2298             skb->pkt_type == PACKET_LOOPBACK ||
2299             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2300             arp->ar_pro != htons(ETH_P_IP) ||
2301             arp->ar_pln != 4)
2302                 goto out_unlock;
2303 
2304         arp_ptr = (unsigned char *)(arp + 1);
2305         arp_ptr += bond->dev->addr_len;
2306         memcpy(&sip, arp_ptr, 4);
2307         arp_ptr += 4 + bond->dev->addr_len;
2308         memcpy(&tip, arp_ptr, 4);
2309 
2310         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2311                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2312                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2313                  &sip, &tip);
2314 
2315         /*
2316          * Backup slaves won't see the ARP reply, but do come through
2317          * here for each ARP probe (so we swap the sip/tip to validate
2318          * the probe).  In a "redundant switch, common router" type of
2319          * configuration, the ARP probe will (hopefully) travel from
2320          * the active, through one switch, the router, then the other
2321          * switch before reaching the backup.
2322          *
2323          * We 'trust' the arp requests if there is an active slave and
2324          * it received valid arp reply(s) after it became active. This
2325          * is done to avoid endless looping when we can't reach the
2326          * arp_ip_target and fool ourselves with our own arp requests.
2327          */
2328         if (bond_is_active_slave(slave))
2329                 bond_validate_arp(bond, slave, sip, tip);
2330         else if (bond->curr_active_slave &&
2331                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2332                             bond->curr_active_slave->jiffies))
2333                 bond_validate_arp(bond, slave, tip, sip);
2334 
2335 out_unlock:
2336         read_unlock(&bond->lock);
2337         if (arp != (struct arphdr *)skb->data)
2338                 kfree(arp);
2339         return RX_HANDLER_ANOTHER;
2340 }
2341 
2342 /* function to verify if we're in the arp_interval timeslice, returns true if
2343  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2344  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2345  */
2346 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2347                                   int mod)
2348 {
2349         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2350 
2351         return time_in_range(jiffies,
2352                              last_act - delta_in_ticks,
2353                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2354 }
2355 
2356 /*
2357  * this function is called regularly to monitor each slave's link
2358  * ensuring that traffic is being sent and received when arp monitoring
2359  * is used in load-balancing mode. if the adapter has been dormant, then an
2360  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2361  * arp monitoring in active backup mode.
2362  */
2363 static void bond_loadbalance_arp_mon(struct work_struct *work)
2364 {
2365         struct bonding *bond = container_of(work, struct bonding,
2366                                             arp_work.work);
2367         struct slave *slave, *oldcurrent;
2368         struct list_head *iter;
2369         int do_failover = 0, slave_state_changed = 0;
2370 
2371         if (!bond_has_slaves(bond))
2372                 goto re_arm;
2373 
2374         rcu_read_lock();
2375 
2376         oldcurrent = ACCESS_ONCE(bond->curr_active_slave);
2377         /* see if any of the previous devices are up now (i.e. they have
2378          * xmt and rcv traffic). the curr_active_slave does not come into
2379          * the picture unless it is null. also, slave->jiffies is not needed
2380          * here because we send an arp on each slave and give a slave as
2381          * long as it needs to get the tx/rx within the delta.
2382          * TODO: what about up/down delay in arp mode? it wasn't here before
2383          *       so it can wait
2384          */
2385         bond_for_each_slave_rcu(bond, slave, iter) {
2386                 unsigned long trans_start = dev_trans_start(slave->dev);
2387 
2388                 if (slave->link != BOND_LINK_UP) {
2389                         if (bond_time_in_interval(bond, trans_start, 1) &&
2390                             bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2391 
2392                                 slave->link  = BOND_LINK_UP;
2393                                 slave_state_changed = 1;
2394 
2395                                 /* primary_slave has no meaning in round-robin
2396                                  * mode. the window of a slave being up and
2397                                  * curr_active_slave being null after enslaving
2398                                  * is closed.
2399                                  */
2400                                 if (!oldcurrent) {
2401                                         pr_info("%s: link status definitely up for interface %s, ",
2402                                                 bond->dev->name,
2403                                                 slave->dev->name);
2404                                         do_failover = 1;
2405                                 } else {
2406                                         pr_info("%s: interface %s is now up\n",
2407                                                 bond->dev->name,
2408                                                 slave->dev->name);
2409                                 }
2410                         }
2411                 } else {
2412                         /* slave->link == BOND_LINK_UP */
2413 
2414                         /* not all switches will respond to an arp request
2415                          * when the source ip is 0, so don't take the link down
2416                          * if we don't know our ip yet
2417                          */
2418                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2419                             !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2420 
2421                                 slave->link  = BOND_LINK_DOWN;
2422                                 slave_state_changed = 1;
2423 
2424                                 if (slave->link_failure_count < UINT_MAX)
2425                                         slave->link_failure_count++;
2426 
2427                                 pr_info("%s: interface %s is now down.\n",
2428                                         bond->dev->name,
2429                                         slave->dev->name);
2430 
2431                                 if (slave == oldcurrent)
2432                                         do_failover = 1;
2433                         }
2434                 }
2435 
2436                 /* note: if switch is in round-robin mode, all links
2437                  * must tx arp to ensure all links rx an arp - otherwise
2438                  * links may oscillate or not come up at all; if switch is
2439                  * in something like xor mode, there is nothing we can
2440                  * do - all replies will be rx'ed on same link causing slaves
2441                  * to be unstable during low/no traffic periods
2442                  */
2443                 if (IS_UP(slave->dev))
2444                         bond_arp_send_all(bond, slave);
2445         }
2446 
2447         rcu_read_unlock();
2448 
2449         if (do_failover || slave_state_changed) {
2450                 if (!rtnl_trylock())
2451                         goto re_arm;
2452 
2453                 if (slave_state_changed) {
2454                         bond_slave_state_change(bond);
2455                 } else if (do_failover) {
2456                         /* the bond_select_active_slave must hold RTNL
2457                          * and curr_slave_lock for write.
2458                          */
2459                         block_netpoll_tx();
2460                         write_lock_bh(&bond->curr_slave_lock);
2461 
2462                         bond_select_active_slave(bond);
2463 
2464                         write_unlock_bh(&bond->curr_slave_lock);
2465                         unblock_netpoll_tx();
2466                 }
2467                 rtnl_unlock();
2468         }
2469 
2470 re_arm:
2471         if (bond->params.arp_interval)
2472                 queue_delayed_work(bond->wq, &bond->arp_work,
2473                                    msecs_to_jiffies(bond->params.arp_interval));
2474 }
2475 
2476 /*
2477  * Called to inspect slaves for active-backup mode ARP monitor link state
2478  * changes.  Sets new_link in slaves to specify what action should take
2479  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2480  * to link states must be committed.
2481  *
2482  * Called with rcu_read_lock hold.
2483  */
2484 static int bond_ab_arp_inspect(struct bonding *bond)
2485 {
2486         unsigned long trans_start, last_rx;
2487         struct list_head *iter;
2488         struct slave *slave;
2489         int commit = 0;
2490 
2491         bond_for_each_slave_rcu(bond, slave, iter) {
2492                 slave->new_link = BOND_LINK_NOCHANGE;
2493                 last_rx = slave_last_rx(bond, slave);
2494 
2495                 if (slave->link != BOND_LINK_UP) {
2496                         if (bond_time_in_interval(bond, last_rx, 1)) {
2497                                 slave->new_link = BOND_LINK_UP;
2498                                 commit++;
2499                         }
2500                         continue;
2501                 }
2502 
2503                 /*
2504                  * Give slaves 2*delta after being enslaved or made
2505                  * active.  This avoids bouncing, as the last receive
2506                  * times need a full ARP monitor cycle to be updated.
2507                  */
2508                 if (bond_time_in_interval(bond, slave->jiffies, 2))
2509                         continue;
2510 
2511                 /*
2512                  * Backup slave is down if:
2513                  * - No current_arp_slave AND
2514                  * - more than 3*delta since last receive AND
2515                  * - the bond has an IP address
2516                  *
2517                  * Note: a non-null current_arp_slave indicates
2518                  * the curr_active_slave went down and we are
2519                  * searching for a new one; under this condition
2520                  * we only take the curr_active_slave down - this
2521                  * gives each slave a chance to tx/rx traffic
2522                  * before being taken out
2523                  */
2524                 if (!bond_is_active_slave(slave) &&
2525                     !bond->current_arp_slave &&
2526                     !bond_time_in_interval(bond, last_rx, 3)) {
2527                         slave->new_link = BOND_LINK_DOWN;
2528                         commit++;
2529                 }
2530 
2531                 /*
2532                  * Active slave is down if:
2533                  * - more than 2*delta since transmitting OR
2534                  * - (more than 2*delta since receive AND
2535                  *    the bond has an IP address)
2536                  */
2537                 trans_start = dev_trans_start(slave->dev);
2538                 if (bond_is_active_slave(slave) &&
2539                     (!bond_time_in_interval(bond, trans_start, 2) ||
2540                      !bond_time_in_interval(bond, last_rx, 2))) {
2541                         slave->new_link = BOND_LINK_DOWN;
2542                         commit++;
2543                 }
2544         }
2545 
2546         return commit;
2547 }
2548 
2549 /*
2550  * Called to commit link state changes noted by inspection step of
2551  * active-backup mode ARP monitor.
2552  *
2553  * Called with RTNL hold.
2554  */
2555 static void bond_ab_arp_commit(struct bonding *bond)
2556 {
2557         unsigned long trans_start;
2558         struct list_head *iter;
2559         struct slave *slave;
2560 
2561         bond_for_each_slave(bond, slave, iter) {
2562                 switch (slave->new_link) {
2563                 case BOND_LINK_NOCHANGE:
2564                         continue;
2565 
2566                 case BOND_LINK_UP:
2567                         trans_start = dev_trans_start(slave->dev);
2568                         if (bond->curr_active_slave != slave ||
2569                             (!bond->curr_active_slave &&
2570                              bond_time_in_interval(bond, trans_start, 1))) {
2571                                 slave->link = BOND_LINK_UP;
2572                                 if (bond->current_arp_slave) {
2573                                         bond_set_slave_inactive_flags(
2574                                                 bond->current_arp_slave,
2575                                                 BOND_SLAVE_NOTIFY_NOW);
2576                                         bond->current_arp_slave = NULL;
2577                                 }
2578 
2579                                 pr_info("%s: link status definitely up for interface %s.\n",
2580                                         bond->dev->name, slave->dev->name);
2581 
2582                                 if (!bond->curr_active_slave ||
2583                                     (slave == bond->primary_slave))
2584                                         goto do_failover;
2585 
2586                         }
2587 
2588                         continue;
2589 
2590                 case BOND_LINK_DOWN:
2591                         if (slave->link_failure_count < UINT_MAX)
2592                                 slave->link_failure_count++;
2593 
2594                         slave->link = BOND_LINK_DOWN;
2595                         bond_set_slave_inactive_flags(slave,
2596                                                       BOND_SLAVE_NOTIFY_NOW);
2597 
2598                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2599                                 bond->dev->name, slave->dev->name);
2600 
2601                         if (slave == bond->curr_active_slave) {
2602                                 bond->current_arp_slave = NULL;
2603                                 goto do_failover;
2604                         }
2605 
2606                         continue;
2607 
2608                 default:
2609                         pr_err("%s: impossible: new_link %d on slave %s\n",
2610                                bond->dev->name, slave->new_link,
2611                                slave->dev->name);
2612                         continue;
2613                 }
2614 
2615 do_failover:
2616                 ASSERT_RTNL();
2617                 block_netpoll_tx();
2618                 write_lock_bh(&bond->curr_slave_lock);
2619                 bond_select_active_slave(bond);
2620                 write_unlock_bh(&bond->curr_slave_lock);
2621                 unblock_netpoll_tx();
2622         }
2623 
2624         bond_set_carrier(bond);
2625 }
2626 
2627 /*
2628  * Send ARP probes for active-backup mode ARP monitor.
2629  *
2630  * Called with rcu_read_lock hold.
2631  */
2632 static bool bond_ab_arp_probe(struct bonding *bond)
2633 {
2634         struct slave *slave, *before = NULL, *new_slave = NULL,
2635                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2636                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2637         struct list_head *iter;
2638         bool found = false;
2639         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2640 
2641         if (curr_arp_slave && curr_active_slave)
2642                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2643                         curr_arp_slave->dev->name,
2644                         curr_active_slave->dev->name);
2645 
2646         if (curr_active_slave) {
2647                 bond_arp_send_all(bond, curr_active_slave);
2648                 return should_notify_rtnl;
2649         }
2650 
2651         /* if we don't have a curr_active_slave, search for the next available
2652          * backup slave from the current_arp_slave and make it the candidate
2653          * for becoming the curr_active_slave
2654          */
2655 
2656         if (!curr_arp_slave) {
2657                 curr_arp_slave = bond_first_slave_rcu(bond);
2658                 if (!curr_arp_slave)
2659                         return should_notify_rtnl;
2660         }
2661 
2662         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2663 
2664         bond_for_each_slave_rcu(bond, slave, iter) {
2665                 if (!found && !before && IS_UP(slave->dev))
2666                         before = slave;
2667 
2668                 if (found && !new_slave && IS_UP(slave->dev))
2669                         new_slave = slave;
2670                 /* if the link state is up at this point, we
2671                  * mark it down - this can happen if we have
2672                  * simultaneous link failures and
2673                  * reselect_active_interface doesn't make this
2674                  * one the current slave so it is still marked
2675                  * up when it is actually down
2676                  */
2677                 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2678                         slave->link = BOND_LINK_DOWN;
2679                         if (slave->link_failure_count < UINT_MAX)
2680                                 slave->link_failure_count++;
2681 
2682                         bond_set_slave_inactive_flags(slave,
2683                                                       BOND_SLAVE_NOTIFY_LATER);
2684 
2685                         pr_info("%s: backup interface %s is now down.\n",
2686                                 bond->dev->name, slave->dev->name);
2687                 }
2688                 if (slave == curr_arp_slave)
2689                         found = true;
2690         }
2691 
2692         if (!new_slave && before)
2693                 new_slave = before;
2694 
2695         if (!new_slave)
2696                 goto check_state;
2697 
2698         new_slave->link = BOND_LINK_BACK;
2699         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2700         bond_arp_send_all(bond, new_slave);
2701         new_slave->jiffies = jiffies;
2702         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2703 
2704 check_state:
2705         bond_for_each_slave_rcu(bond, slave, iter) {
2706                 if (slave->should_notify) {
2707                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2708                         break;
2709                 }
2710         }
2711         return should_notify_rtnl;
2712 }
2713 
2714 static void bond_activebackup_arp_mon(struct work_struct *work)
2715 {
2716         struct bonding *bond = container_of(work, struct bonding,
2717                                             arp_work.work);
2718         bool should_notify_peers = false;
2719         bool should_notify_rtnl = false;
2720         int delta_in_ticks;
2721 
2722         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2723 
2724         if (!bond_has_slaves(bond))
2725                 goto re_arm;
2726 
2727         rcu_read_lock();
2728 
2729         should_notify_peers = bond_should_notify_peers(bond);
2730 
2731         if (bond_ab_arp_inspect(bond)) {
2732                 rcu_read_unlock();
2733 
2734                 /* Race avoidance with bond_close flush of workqueue */
2735                 if (!rtnl_trylock()) {
2736                         delta_in_ticks = 1;
2737                         should_notify_peers = false;
2738                         goto re_arm;
2739                 }
2740 
2741                 bond_ab_arp_commit(bond);
2742 
2743                 rtnl_unlock();
2744                 rcu_read_lock();
2745         }
2746 
2747         should_notify_rtnl = bond_ab_arp_probe(bond);
2748         rcu_read_unlock();
2749 
2750 re_arm:
2751         if (bond->params.arp_interval)
2752                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2753 
2754         if (should_notify_peers || should_notify_rtnl) {
2755                 if (!rtnl_trylock())
2756                         return;
2757 
2758                 if (should_notify_peers)
2759                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2760                                                  bond->dev);
2761                 if (should_notify_rtnl)
2762                         bond_slave_state_notify(bond);
2763 
2764                 rtnl_unlock();
2765         }
2766 }
2767 
2768 /*-------------------------- netdev event handling --------------------------*/
2769 
2770 /*
2771  * Change device name
2772  */
2773 static int bond_event_changename(struct bonding *bond)
2774 {
2775         bond_remove_proc_entry(bond);
2776         bond_create_proc_entry(bond);
2777 
2778         bond_debug_reregister(bond);
2779 
2780         return NOTIFY_DONE;
2781 }
2782 
2783 static int bond_master_netdev_event(unsigned long event,
2784                                     struct net_device *bond_dev)
2785 {
2786         struct bonding *event_bond = netdev_priv(bond_dev);
2787 
2788         switch (event) {
2789         case NETDEV_CHANGENAME:
2790                 return bond_event_changename(event_bond);
2791         case NETDEV_UNREGISTER:
2792                 bond_remove_proc_entry(event_bond);
2793                 break;
2794         case NETDEV_REGISTER:
2795                 bond_create_proc_entry(event_bond);
2796                 break;
2797         case NETDEV_NOTIFY_PEERS:
2798                 if (event_bond->send_peer_notif)
2799                         event_bond->send_peer_notif--;
2800                 break;
2801         default:
2802                 break;
2803         }
2804 
2805         return NOTIFY_DONE;
2806 }
2807 
2808 static int bond_slave_netdev_event(unsigned long event,
2809                                    struct net_device *slave_dev)
2810 {
2811         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2812         struct bonding *bond;
2813         struct net_device *bond_dev;
2814         u32 old_speed;
2815         u8 old_duplex;
2816 
2817         /* A netdev event can be generated while enslaving a device
2818          * before netdev_rx_handler_register is called in which case
2819          * slave will be NULL
2820          */
2821         if (!slave)
2822                 return NOTIFY_DONE;
2823         bond_dev = slave->bond->dev;
2824         bond = slave->bond;
2825 
2826         switch (event) {
2827         case NETDEV_UNREGISTER:
2828                 if (bond_dev->type != ARPHRD_ETHER)
2829                         bond_release_and_destroy(bond_dev, slave_dev);
2830                 else
2831                         bond_release(bond_dev, slave_dev);
2832                 break;
2833         case NETDEV_UP:
2834         case NETDEV_CHANGE:
2835                 old_speed = slave->speed;
2836                 old_duplex = slave->duplex;
2837 
2838                 bond_update_speed_duplex(slave);
2839 
2840                 if (bond->params.mode == BOND_MODE_8023AD) {
2841                         if (old_speed != slave->speed)
2842                                 bond_3ad_adapter_speed_changed(slave);
2843                         if (old_duplex != slave->duplex)
2844                                 bond_3ad_adapter_duplex_changed(slave);
2845                 }
2846                 break;
2847         case NETDEV_DOWN:
2848                 /*
2849                  * ... Or is it this?
2850                  */
2851                 break;
2852         case NETDEV_CHANGEMTU:
2853                 /*
2854                  * TODO: Should slaves be allowed to
2855                  * independently alter their MTU?  For
2856                  * an active-backup bond, slaves need
2857                  * not be the same type of device, so
2858                  * MTUs may vary.  For other modes,
2859                  * slaves arguably should have the
2860                  * same MTUs. To do this, we'd need to
2861                  * take over the slave's change_mtu
2862                  * function for the duration of their
2863                  * servitude.
2864                  */
2865                 break;
2866         case NETDEV_CHANGENAME:
2867                 /* we don't care if we don't have primary set */
2868                 if (!USES_PRIMARY(bond->params.mode) ||
2869                     !bond->params.primary[0])
2870                         break;
2871 
2872                 if (slave == bond->primary_slave) {
2873                         /* slave's name changed - he's no longer primary */
2874                         bond->primary_slave = NULL;
2875                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2876                         /* we have a new primary slave */
2877                         bond->primary_slave = slave;
2878                 } else { /* we didn't change primary - exit */
2879                         break;
2880                 }
2881 
2882                 pr_info("%s: Primary slave changed to %s, reselecting active slave.\n",
2883                         bond->dev->name, bond->primary_slave ? slave_dev->name :
2884                                                                "none");
2885 
2886                 block_netpoll_tx();
2887                 write_lock_bh(&bond->curr_slave_lock);
2888                 bond_select_active_slave(bond);
2889                 write_unlock_bh(&bond->curr_slave_lock);
2890                 unblock_netpoll_tx();
2891                 break;
2892         case NETDEV_FEAT_CHANGE:
2893                 bond_compute_features(bond);
2894                 break;
2895         case NETDEV_RESEND_IGMP:
2896                 /* Propagate to master device */
2897                 call_netdevice_notifiers(event, slave->bond->dev);
2898                 break;
2899         default:
2900                 break;
2901         }
2902 
2903         return NOTIFY_DONE;
2904 }
2905 
2906 /*
2907  * bond_netdev_event: handle netdev notifier chain events.
2908  *
2909  * This function receives events for the netdev chain.  The caller (an
2910  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2911  * locks for us to safely manipulate the slave devices (RTNL lock,
2912  * dev_probe_lock).
2913  */
2914 static int bond_netdev_event(struct notifier_block *this,
2915                              unsigned long event, void *ptr)
2916 {
2917         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2918 
2919         pr_debug("event_dev: %s, event: %lx\n",
2920                  event_dev ? event_dev->name : "None",
2921                  event);
2922 
2923         if (!(event_dev->priv_flags & IFF_BONDING))
2924                 return NOTIFY_DONE;
2925 
2926         if (event_dev->flags & IFF_MASTER) {
2927                 pr_debug("IFF_MASTER\n");
2928                 return bond_master_netdev_event(event, event_dev);
2929         }
2930 
2931         if (event_dev->flags & IFF_SLAVE) {
2932                 pr_debug("IFF_SLAVE\n");
2933                 return bond_slave_netdev_event(event, event_dev);
2934         }
2935 
2936         return NOTIFY_DONE;
2937 }
2938 
2939 static struct notifier_block bond_netdev_notifier = {
2940         .notifier_call = bond_netdev_event,
2941 };
2942 
2943 /*---------------------------- Hashing Policies -----------------------------*/
2944 
2945 /* L2 hash helper */
2946 static inline u32 bond_eth_hash(struct sk_buff *skb)
2947 {
2948         struct ethhdr *data = (struct ethhdr *)skb->data;
2949 
2950         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
2951                 return data->h_dest[5] ^ data->h_source[5];
2952 
2953         return 0;
2954 }
2955 
2956 /* Extract the appropriate headers based on bond's xmit policy */
2957 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2958                               struct flow_keys *fk)
2959 {
2960         const struct ipv6hdr *iph6;
2961         const struct iphdr *iph;
2962         int noff, proto = -1;
2963 
2964         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2965                 return skb_flow_dissect(skb, fk);
2966 
2967         fk->ports = 0;
2968         noff = skb_network_offset(skb);
2969         if (skb->protocol == htons(ETH_P_IP)) {
2970                 if (!pskb_may_pull(skb, noff + sizeof(*iph)))
2971                         return false;
2972                 iph = ip_hdr(skb);
2973                 fk->src = iph->saddr;
2974                 fk->dst = iph->daddr;
2975                 noff += iph->ihl << 2;
2976                 if (!ip_is_fragment(iph))
2977                         proto = iph->protocol;
2978         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2979                 if (!pskb_may_pull(skb, noff + sizeof(*iph6)))
2980                         return false;
2981                 iph6 = ipv6_hdr(skb);
2982                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2983                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2984                 noff += sizeof(*iph6);
2985                 proto = iph6->nexthdr;
2986         } else {
2987                 return false;
2988         }
2989         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
2990                 fk->ports = skb_flow_get_ports(skb, noff, proto);
2991 
2992         return true;
2993 }
2994 
2995 /**
2996  * bond_xmit_hash - generate a hash value based on the xmit policy
2997  * @bond: bonding device
2998  * @skb: buffer to use for headers
2999  * @count: modulo value
3000  *
3001  * This function will extract the necessary headers from the skb buffer and use
3002  * them to generate a hash based on the xmit_policy set in the bonding device
3003  * which will be reduced modulo count before returning.
3004  */
3005 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
3006 {
3007         struct flow_keys flow;
3008         u32 hash;
3009 
3010         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3011             !bond_flow_dissect(bond, skb, &flow))
3012                 return bond_eth_hash(skb) % count;
3013 
3014         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3015             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3016                 hash = bond_eth_hash(skb);
3017         else
3018                 hash = (__force u32)flow.ports;
3019         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3020         hash ^= (hash >> 16);
3021         hash ^= (hash >> 8);
3022 
3023         return hash % count;
3024 }
3025 
3026 /*-------------------------- Device entry points ----------------------------*/
3027 
3028 static void bond_work_init_all(struct bonding *bond)
3029 {
3030         INIT_DELAYED_WORK(&bond->mcast_work,
3031                           bond_resend_igmp_join_requests_delayed);
3032         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3033         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3034         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3035                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3036         else
3037                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3038         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3039 }
3040 
3041 static void bond_work_cancel_all(struct bonding *bond)
3042 {
3043         cancel_delayed_work_sync(&bond->mii_work);
3044         cancel_delayed_work_sync(&bond->arp_work);
3045         cancel_delayed_work_sync(&bond->alb_work);
3046         cancel_delayed_work_sync(&bond->ad_work);
3047         cancel_delayed_work_sync(&bond->mcast_work);
3048 }
3049 
3050 static int bond_open(struct net_device *bond_dev)
3051 {
3052         struct bonding *bond = netdev_priv(bond_dev);
3053         struct list_head *iter;
3054         struct slave *slave;
3055 
3056         /* reset slave->backup and slave->inactive */
3057         read_lock(&bond->lock);
3058         if (bond_has_slaves(bond)) {
3059                 read_lock(&bond->curr_slave_lock);
3060                 bond_for_each_slave(bond, slave, iter) {
3061                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3062                                 && (slave != bond->curr_active_slave)) {
3063                                 bond_set_slave_inactive_flags(slave,
3064                                                               BOND_SLAVE_NOTIFY_NOW);
3065                         } else {
3066                                 bond_set_slave_active_flags(slave,
3067                                                             BOND_SLAVE_NOTIFY_NOW);
3068                         }
3069                 }
3070                 read_unlock(&bond->curr_slave_lock);
3071         }
3072         read_unlock(&bond->lock);
3073 
3074         bond_work_init_all(bond);
3075 
3076         if (bond_is_lb(bond)) {
3077                 /* bond_alb_initialize must be called before the timer
3078                  * is started.
3079                  */
3080                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3081                         return -ENOMEM;
3082                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3083         }
3084 
3085         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3086                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3087 
3088         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3089                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3090                 if (bond->params.arp_validate)
3091                         bond->recv_probe = bond_arp_rcv;
3092         }
3093 
3094         if (bond->params.mode == BOND_MODE_8023AD) {
3095                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3096                 /* register to receive LACPDUs */
3097                 bond->recv_probe = bond_3ad_lacpdu_recv;
3098                 bond_3ad_initiate_agg_selection(bond, 1);
3099         }
3100 
3101         return 0;
3102 }
3103 
3104 static int bond_close(struct net_device *bond_dev)
3105 {
3106         struct bonding *bond = netdev_priv(bond_dev);
3107 
3108         bond_work_cancel_all(bond);
3109         bond->send_peer_notif = 0;
3110         if (bond_is_lb(bond))
3111                 bond_alb_deinitialize(bond);
3112         bond->recv_probe = NULL;
3113 
3114         return 0;
3115 }
3116 
3117 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3118                                                 struct rtnl_link_stats64 *stats)
3119 {
3120         struct bonding *bond = netdev_priv(bond_dev);
3121         struct rtnl_link_stats64 temp;
3122         struct list_head *iter;
3123         struct slave *slave;
3124 
3125         memset(stats, 0, sizeof(*stats));
3126 
3127         read_lock_bh(&bond->lock);
3128         bond_for_each_slave(bond, slave, iter) {
3129                 const struct rtnl_link_stats64 *sstats =
3130                         dev_get_stats(slave->dev, &temp);
3131 
3132                 stats->rx_packets += sstats->rx_packets;
3133                 stats->rx_bytes += sstats->rx_bytes;
3134                 stats->rx_errors += sstats->rx_errors;
3135                 stats->rx_dropped += sstats->rx_dropped;
3136 
3137                 stats->tx_packets += sstats->tx_packets;
3138                 stats->tx_bytes += sstats->tx_bytes;
3139                 stats->tx_errors += sstats->tx_errors;
3140                 stats->tx_dropped += sstats->tx_dropped;
3141 
3142                 stats->multicast += sstats->multicast;
3143                 stats->collisions += sstats->collisions;
3144 
3145                 stats->rx_length_errors += sstats->rx_length_errors;
3146                 stats->rx_over_errors += sstats->rx_over_errors;
3147                 stats->rx_crc_errors += sstats->rx_crc_errors;
3148                 stats->rx_frame_errors += sstats->rx_frame_errors;
3149                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3150                 stats->rx_missed_errors += sstats->rx_missed_errors;
3151 
3152                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3153                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3154                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3155                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3156                 stats->tx_window_errors += sstats->tx_window_errors;
3157         }
3158         read_unlock_bh(&bond->lock);
3159 
3160         return stats;
3161 }
3162 
3163 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3164 {
3165         struct bonding *bond = netdev_priv(bond_dev);
3166         struct net_device *slave_dev = NULL;
3167         struct ifbond k_binfo;
3168         struct ifbond __user *u_binfo = NULL;
3169         struct ifslave k_sinfo;
3170         struct ifslave __user *u_sinfo = NULL;
3171         struct mii_ioctl_data *mii = NULL;
3172         struct bond_opt_value newval;
3173         struct net *net;
3174         int res = 0;
3175 
3176         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3177 
3178         switch (cmd) {
3179         case SIOCGMIIPHY:
3180                 mii = if_mii(ifr);
3181                 if (!mii)
3182                         return -EINVAL;
3183 
3184                 mii->phy_id = 0;
3185                 /* Fall Through */
3186         case SIOCGMIIREG:
3187                 /*
3188                  * We do this again just in case we were called by SIOCGMIIREG
3189                  * instead of SIOCGMIIPHY.
3190                  */
3191                 mii = if_mii(ifr);
3192                 if (!mii)
3193                         return -EINVAL;
3194 
3195 
3196                 if (mii->reg_num == 1) {
3197                         mii->val_out = 0;
3198                         read_lock(&bond->lock);
3199                         read_lock(&bond->curr_slave_lock);
3200                         if (netif_carrier_ok(bond->dev))
3201                                 mii->val_out = BMSR_LSTATUS;
3202 
3203                         read_unlock(&bond->curr_slave_lock);
3204                         read_unlock(&bond->lock);
3205                 }
3206 
3207                 return 0;
3208         case BOND_INFO_QUERY_OLD:
3209         case SIOCBONDINFOQUERY:
3210                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3211 
3212                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3213                         return -EFAULT;
3214 
3215                 res = bond_info_query(bond_dev, &k_binfo);
3216                 if (res == 0 &&
3217                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3218                         return -EFAULT;
3219 
3220                 return res;
3221         case BOND_SLAVE_INFO_QUERY_OLD:
3222         case SIOCBONDSLAVEINFOQUERY:
3223                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3224 
3225                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3226                         return -EFAULT;
3227 
3228                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3229                 if (res == 0 &&
3230                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3231                         return -EFAULT;
3232 
3233                 return res;
3234         default:
3235                 /* Go on */
3236                 break;
3237         }
3238 
3239         net = dev_net(bond_dev);
3240 
3241         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3242                 return -EPERM;
3243 
3244         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3245 
3246         pr_debug("slave_dev=%p:\n", slave_dev);
3247 
3248         if (!slave_dev)
3249                 return -ENODEV;
3250 
3251         pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3252         switch (cmd) {
3253         case BOND_ENSLAVE_OLD:
3254         case SIOCBONDENSLAVE:
3255                 res = bond_enslave(bond_dev, slave_dev);
3256                 break;
3257         case BOND_RELEASE_OLD:
3258         case SIOCBONDRELEASE:
3259                 res = bond_release(bond_dev, slave_dev);
3260                 break;
3261         case BOND_SETHWADDR_OLD:
3262         case SIOCBONDSETHWADDR:
3263                 bond_set_dev_addr(bond_dev, slave_dev);
3264                 res = 0;
3265                 break;
3266         case BOND_CHANGE_ACTIVE_OLD:
3267         case SIOCBONDCHANGEACTIVE:
3268                 bond_opt_initstr(&newval, slave_dev->name);
3269                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3270                 break;
3271         default:
3272                 res = -EOPNOTSUPP;
3273         }
3274 
3275         return res;
3276 }
3277 
3278 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3279 {
3280         struct bonding *bond = netdev_priv(bond_dev);
3281 
3282         if (change & IFF_PROMISC)
3283                 bond_set_promiscuity(bond,
3284                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3285 
3286         if (change & IFF_ALLMULTI)
3287                 bond_set_allmulti(bond,
3288                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3289 }
3290 
3291 static void bond_set_rx_mode(struct net_device *bond_dev)
3292 {
3293         struct bonding *bond = netdev_priv(bond_dev);
3294         struct list_head *iter;
3295         struct slave *slave;
3296 
3297 
3298         rcu_read_lock();
3299         if (USES_PRIMARY(bond->params.mode)) {
3300                 slave = rcu_dereference(bond->curr_active_slave);
3301                 if (slave) {
3302                         dev_uc_sync(slave->dev, bond_dev);
3303                         dev_mc_sync(slave->dev, bond_dev);
3304                 }
3305         } else {
3306                 bond_for_each_slave_rcu(bond, slave, iter) {
3307                         dev_uc_sync_multiple(slave->dev, bond_dev);
3308                         dev_mc_sync_multiple(slave->dev, bond_dev);
3309                 }
3310         }
3311         rcu_read_unlock();
3312 }
3313 
3314 static int bond_neigh_init(struct neighbour *n)
3315 {
3316         struct bonding *bond = netdev_priv(n->dev);
3317         const struct net_device_ops *slave_ops;
3318         struct neigh_parms parms;
3319         struct slave *slave;
3320         int ret;
3321 
3322         slave = bond_first_slave(bond);
3323         if (!slave)
3324                 return 0;
3325         slave_ops = slave->dev->netdev_ops;
3326         if (!slave_ops->ndo_neigh_setup)
3327                 return 0;
3328 
3329         parms.neigh_setup = NULL;
3330         parms.neigh_cleanup = NULL;
3331         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3332         if (ret)
3333                 return ret;
3334 
3335         /*
3336          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3337          * after the last slave has been detached.  Assumes that all slaves
3338          * utilize the same neigh_cleanup (true at this writing as only user
3339          * is ipoib).
3340          */
3341         n->parms->neigh_cleanup = parms.neigh_cleanup;
3342 
3343         if (!parms.neigh_setup)
3344                 return 0;
3345 
3346         return parms.neigh_setup(n);
3347 }
3348 
3349 /*
3350  * The bonding ndo_neigh_setup is called at init time beofre any
3351  * slave exists. So we must declare proxy setup function which will
3352  * be used at run time to resolve the actual slave neigh param setup.
3353  *
3354  * It's also called by master devices (such as vlans) to setup their
3355  * underlying devices. In that case - do nothing, we're already set up from
3356  * our init.
3357  */
3358 static int bond_neigh_setup(struct net_device *dev,
3359                             struct neigh_parms *parms)
3360 {
3361         /* modify only our neigh_parms */
3362         if (parms->dev == dev)
3363                 parms->neigh_setup = bond_neigh_init;
3364 
3365         return 0;
3366 }
3367 
3368 /*
3369  * Change the MTU of all of a master's slaves to match the master
3370  */
3371 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3372 {
3373         struct bonding *bond = netdev_priv(bond_dev);
3374         struct slave *slave, *rollback_slave;
3375         struct list_head *iter;
3376         int res = 0;
3377 
3378         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3379                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3380 
3381         /* Can't hold bond->lock with bh disabled here since
3382          * some base drivers panic. On the other hand we can't
3383          * hold bond->lock without bh disabled because we'll
3384          * deadlock. The only solution is to rely on the fact
3385          * that we're under rtnl_lock here, and the slaves
3386          * list won't change. This doesn't solve the problem
3387          * of setting the slave's MTU while it is
3388          * transmitting, but the assumption is that the base
3389          * driver can handle that.
3390          *
3391          * TODO: figure out a way to safely iterate the slaves
3392          * list, but without holding a lock around the actual
3393          * call to the base driver.
3394          */
3395 
3396         bond_for_each_slave(bond, slave, iter) {
3397                 pr_debug("s %p c_m %p\n",
3398                          slave,
3399                          slave->dev->netdev_ops->ndo_change_mtu);
3400 
3401                 res = dev_set_mtu(slave->dev, new_mtu);
3402 
3403                 if (res) {
3404                         /* If we failed to set the slave's mtu to the new value
3405                          * we must abort the operation even in ACTIVE_BACKUP
3406                          * mode, because if we allow the backup slaves to have
3407                          * different mtu values than the active slave we'll
3408                          * need to change their mtu when doing a failover. That
3409                          * means changing their mtu from timer context, which
3410                          * is probably not a good idea.
3411                          */
3412                         pr_debug("err %d %s\n", res, slave->dev->name);
3413                         goto unwind;
3414                 }
3415         }
3416 
3417         bond_dev->mtu = new_mtu;
3418 
3419         return 0;
3420 
3421 unwind:
3422         /* unwind from head to the slave that failed */
3423         bond_for_each_slave(bond, rollback_slave, iter) {
3424                 int tmp_res;
3425 
3426                 if (rollback_slave == slave)
3427                         break;
3428 
3429                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3430                 if (tmp_res) {
3431                         pr_debug("unwind err %d dev %s\n",
3432                                  tmp_res, rollback_slave->dev->name);
3433                 }
3434         }
3435 
3436         return res;
3437 }
3438 
3439 /*
3440  * Change HW address
3441  *
3442  * Note that many devices must be down to change the HW address, and
3443  * downing the master releases all slaves.  We can make bonds full of
3444  * bonding devices to test this, however.
3445  */
3446 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3447 {
3448         struct bonding *bond = netdev_priv(bond_dev);
3449         struct slave *slave, *rollback_slave;
3450         struct sockaddr *sa = addr, tmp_sa;
3451         struct list_head *iter;
3452         int res = 0;
3453 
3454         if (bond->params.mode == BOND_MODE_ALB)
3455                 return bond_alb_set_mac_address(bond_dev, addr);
3456 
3457 
3458         pr_debug("bond=%p, name=%s\n",
3459                  bond, bond_dev ? bond_dev->name : "None");
3460 
3461         /* If fail_over_mac is enabled, do nothing and return success.
3462          * Returning an error causes ifenslave to fail.
3463          */
3464         if (bond->params.fail_over_mac &&
3465             bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3466                 return 0;
3467 
3468         if (!is_valid_ether_addr(sa->sa_data))
3469                 return -EADDRNOTAVAIL;
3470 
3471         /* Can't hold bond->lock with bh disabled here since
3472          * some base drivers panic. On the other hand we can't
3473          * hold bond->lock without bh disabled because we'll
3474          * deadlock. The only solution is to rely on the fact
3475          * that we're under rtnl_lock here, and the slaves
3476          * list won't change. This doesn't solve the problem
3477          * of setting the slave's hw address while it is
3478          * transmitting, but the assumption is that the base
3479          * driver can handle that.
3480          *
3481          * TODO: figure out a way to safely iterate the slaves
3482          * list, but without holding a lock around the actual
3483          * call to the base driver.
3484          */
3485 
3486         bond_for_each_slave(bond, slave, iter) {
3487                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3488                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3489 
3490                 if (slave_ops->ndo_set_mac_address == NULL) {
3491                         res = -EOPNOTSUPP;
3492                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3493                         goto unwind;
3494                 }
3495 
3496                 res = dev_set_mac_address(slave->dev, addr);
3497                 if (res) {
3498                         /* TODO: consider downing the slave
3499                          * and retry ?
3500                          * User should expect communications
3501                          * breakage anyway until ARP finish
3502                          * updating, so...
3503                          */
3504                         pr_debug("err %d %s\n", res, slave->dev->name);
3505                         goto unwind;
3506                 }
3507         }
3508 
3509         /* success */
3510         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3511         return 0;
3512 
3513 unwind:
3514         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3515         tmp_sa.sa_family = bond_dev->type;
3516 
3517         /* unwind from head to the slave that failed */
3518         bond_for_each_slave(bond, rollback_slave, iter) {
3519                 int tmp_res;
3520 
3521                 if (rollback_slave == slave)
3522                         break;
3523 
3524                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3525                 if (tmp_res) {
3526                         pr_debug("unwind err %d dev %s\n",
3527                                  tmp_res, rollback_slave->dev->name);
3528                 }
3529         }
3530 
3531         return res;
3532 }
3533 
3534 /**
3535  * bond_xmit_slave_id - transmit skb through slave with slave_id
3536  * @bond: bonding device that is transmitting
3537  * @skb: buffer to transmit
3538  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3539  *
3540  * This function tries to transmit through slave with slave_id but in case
3541  * it fails, it tries to find the first available slave for transmission.
3542  * The skb is consumed in all cases, thus the function is void.
3543  */
3544 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3545 {
3546         struct list_head *iter;
3547         struct slave *slave;
3548         int i = slave_id;
3549 
3550         /* Here we start from the slave with slave_id */
3551         bond_for_each_slave_rcu(bond, slave, iter) {
3552                 if (--i < 0) {
3553                         if (slave_can_tx(slave)) {
3554                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3555                                 return;
3556                         }
3557                 }
3558         }
3559 
3560         /* Here we start from the first slave up to slave_id */
3561         i = slave_id;
3562         bond_for_each_slave_rcu(bond, slave, iter) {
3563                 if (--i < 0)
3564                         break;
3565                 if (slave_can_tx(slave)) {
3566                         bond_dev_queue_xmit(bond, skb, slave->dev);
3567                         return;
3568                 }
3569         }
3570         /* no slave that can tx has been found */
3571         kfree_skb(skb);
3572 }
3573 
3574 /**
3575  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3576  * @bond: bonding device to use
3577  *
3578  * Based on the value of the bonding device's packets_per_slave parameter
3579  * this function generates a slave id, which is usually used as the next
3580  * slave to transmit through.
3581  */
3582 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3583 {
3584         u32 slave_id;
3585         struct reciprocal_value reciprocal_packets_per_slave;
3586         int packets_per_slave = bond->params.packets_per_slave;
3587 
3588         switch (packets_per_slave) {
3589         case 0:
3590                 slave_id = prandom_u32();
3591                 break;
3592         case 1:
3593                 slave_id = bond->rr_tx_counter;
3594                 break;
3595         default:
3596                 reciprocal_packets_per_slave =
3597                         bond->params.reciprocal_packets_per_slave;
3598                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3599                                              reciprocal_packets_per_slave);
3600                 break;
3601         }
3602         bond->rr_tx_counter++;
3603 
3604         return slave_id;
3605 }
3606 
3607 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3608 {
3609         struct bonding *bond = netdev_priv(bond_dev);
3610         struct iphdr *iph = ip_hdr(skb);
3611         struct slave *slave;
3612         u32 slave_id;
3613 
3614         /* Start with the curr_active_slave that joined the bond as the
3615          * default for sending IGMP traffic.  For failover purposes one
3616          * needs to maintain some consistency for the interface that will
3617          * send the join/membership reports.  The curr_active_slave found
3618          * will send all of this type of traffic.
3619          */
3620         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3621                 slave = rcu_dereference(bond->curr_active_slave);
3622                 if (slave && slave_can_tx(slave))
3623                         bond_dev_queue_xmit(bond, skb, slave->dev);
3624                 else
3625                         bond_xmit_slave_id(bond, skb, 0);
3626         } else {
3627                 slave_id = bond_rr_gen_slave_id(bond);
3628                 bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
3629         }
3630 
3631         return NETDEV_TX_OK;
3632 }
3633 
3634 /*
3635  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3636  * the bond has a usable interface.
3637  */
3638 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3639 {
3640         struct bonding *bond = netdev_priv(bond_dev);
3641         struct slave *slave;
3642 
3643         slave = rcu_dereference(bond->curr_active_slave);
3644         if (slave)
3645                 bond_dev_queue_xmit(bond, skb, slave->dev);
3646         else
3647                 kfree_skb(skb);
3648 
3649         return NETDEV_TX_OK;
3650 }
3651 
3652 /* In bond_xmit_xor() , we determine the output device by using a pre-
3653  * determined xmit_hash_policy(), If the selected device is not enabled,
3654  * find the next active slave.
3655  */
3656 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3657 {
3658         struct bonding *bond = netdev_priv(bond_dev);
3659 
3660         bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
3661 
3662         return NETDEV_TX_OK;
3663 }
3664 
3665 /* in broadcast mode, we send everything to all usable interfaces. */
3666 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3667 {
3668         struct bonding *bond = netdev_priv(bond_dev);
3669         struct slave *slave = NULL;
3670         struct list_head *iter;
3671 
3672         bond_for_each_slave_rcu(bond, slave, iter) {
3673                 if (bond_is_last_slave(bond, slave))
3674                         break;
3675                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3676                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3677 
3678                         if (!skb2) {
3679                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3680                                        bond_dev->name);
3681                                 continue;
3682                         }
3683                         /* bond_dev_queue_xmit always returns 0 */
3684                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3685                 }
3686         }
3687         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3688                 bond_dev_queue_xmit(bond, skb, slave->dev);
3689         else
3690                 kfree_skb(skb);
3691 
3692         return NETDEV_TX_OK;
3693 }
3694 
3695 /*------------------------- Device initialization ---------------------------*/
3696 
3697 /*
3698  * Lookup the slave that corresponds to a qid
3699  */
3700 static inline int bond_slave_override(struct bonding *bond,
3701                                       struct sk_buff *skb)
3702 {
3703         struct slave *slave = NULL;
3704         struct list_head *iter;
3705 
3706         if (!skb->queue_mapping)
3707                 return 1;
3708 
3709         /* Find out if any slaves have the same mapping as this skb. */
3710         bond_for_each_slave_rcu(bond, slave, iter) {
3711                 if (slave->queue_id == skb->queue_mapping) {
3712                         if (slave_can_tx(slave)) {
3713                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3714                                 return 0;
3715                         }
3716                         /* If the slave isn't UP, use default transmit policy. */
3717                         break;
3718                 }
3719         }
3720 
3721         return 1;
3722 }
3723 
3724 
3725 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3726                              void *accel_priv, select_queue_fallback_t fallback)
3727 {
3728         /*
3729          * This helper function exists to help dev_pick_tx get the correct
3730          * destination queue.  Using a helper function skips a call to
3731          * skb_tx_hash and will put the skbs in the queue we expect on their
3732          * way down to the bonding driver.
3733          */
3734         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3735 
3736         /*
3737          * Save the original txq to restore before passing to the driver
3738          */
3739         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3740 
3741         if (unlikely(txq >= dev->real_num_tx_queues)) {
3742                 do {
3743                         txq -= dev->real_num_tx_queues;
3744                 } while (txq >= dev->real_num_tx_queues);
3745         }
3746         return txq;
3747 }
3748 
3749 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3750 {
3751         struct bonding *bond = netdev_priv(dev);
3752 
3753         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3754                 if (!bond_slave_override(bond, skb))
3755                         return NETDEV_TX_OK;
3756         }
3757 
3758         switch (bond->params.mode) {
3759         case BOND_MODE_ROUNDROBIN:
3760                 return bond_xmit_roundrobin(skb, dev);
3761         case BOND_MODE_ACTIVEBACKUP:
3762                 return bond_xmit_activebackup(skb, dev);
3763         case BOND_MODE_XOR:
3764                 return bond_xmit_xor(skb, dev);
3765         case BOND_MODE_BROADCAST:
3766                 return bond_xmit_broadcast(skb, dev);
3767         case BOND_MODE_8023AD:
3768                 return bond_3ad_xmit_xor(skb, dev);
3769         case BOND_MODE_ALB:
3770         case BOND_MODE_TLB:
3771                 return bond_alb_xmit(skb, dev);
3772         default:
3773                 /* Should never happen, mode already checked */
3774                 pr_err("%s: Error: Unknown bonding mode %d\n",
3775                        dev->name, bond->params.mode);
3776                 WARN_ON_ONCE(1);
3777                 kfree_skb(skb);
3778                 return NETDEV_TX_OK;
3779         }
3780 }
3781 
3782 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3783 {
3784         struct bonding *bond = netdev_priv(dev);
3785         netdev_tx_t ret = NETDEV_TX_OK;
3786 
3787         /*
3788          * If we risk deadlock from transmitting this in the
3789          * netpoll path, tell netpoll to queue the frame for later tx
3790          */
3791         if (is_netpoll_tx_blocked(dev))
3792                 return NETDEV_TX_BUSY;
3793 
3794         rcu_read_lock();
3795         if (bond_has_slaves(bond))
3796                 ret = __bond_start_xmit(skb, dev);
3797         else
3798                 kfree_skb(skb);
3799         rcu_read_unlock();
3800 
3801         return ret;
3802 }
3803 
3804 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3805                                      struct ethtool_cmd *ecmd)
3806 {
3807         struct bonding *bond = netdev_priv(bond_dev);
3808         unsigned long speed = 0;
3809         struct list_head *iter;
3810         struct slave *slave;
3811 
3812         ecmd->duplex = DUPLEX_UNKNOWN;
3813         ecmd->port = PORT_OTHER;
3814 
3815         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3816          * do not need to check mode.  Though link speed might not represent
3817          * the true receive or transmit bandwidth (not all modes are symmetric)
3818          * this is an accurate maximum.
3819          */
3820         read_lock(&bond->lock);
3821         bond_for_each_slave(bond, slave, iter) {
3822                 if (SLAVE_IS_OK(slave)) {
3823                         if (slave->speed != SPEED_UNKNOWN)
3824                                 speed += slave->speed;
3825                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3826                             slave->duplex != DUPLEX_UNKNOWN)
3827                                 ecmd->duplex = slave->duplex;
3828                 }
3829         }
3830         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3831         read_unlock(&bond->lock);
3832 
3833         return 0;
3834 }
3835 
3836 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3837                                      struct ethtool_drvinfo *drvinfo)
3838 {
3839         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3840         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3841         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3842                  BOND_ABI_VERSION);
3843 }
3844 
3845 static const struct ethtool_ops bond_ethtool_ops = {
3846         .get_drvinfo            = bond_ethtool_get_drvinfo,
3847         .get_settings           = bond_ethtool_get_settings,
3848         .get_link               = ethtool_op_get_link,
3849 };
3850 
3851 static const struct net_device_ops bond_netdev_ops = {
3852         .ndo_init               = bond_init,
3853         .ndo_uninit             = bond_uninit,
3854         .ndo_open               = bond_open,
3855         .ndo_stop               = bond_close,
3856         .ndo_start_xmit         = bond_start_xmit,
3857         .ndo_select_queue       = bond_select_queue,
3858         .ndo_get_stats64        = bond_get_stats,
3859         .ndo_do_ioctl           = bond_do_ioctl,
3860         .ndo_change_rx_flags    = bond_change_rx_flags,
3861         .ndo_set_rx_mode        = bond_set_rx_mode,
3862         .ndo_change_mtu         = bond_change_mtu,
3863         .ndo_set_mac_address    = bond_set_mac_address,
3864         .ndo_neigh_setup        = bond_neigh_setup,
3865         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3866         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3867 #ifdef CONFIG_NET_POLL_CONTROLLER
3868         .ndo_netpoll_setup      = bond_netpoll_setup,
3869         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3870         .ndo_poll_controller    = bond_poll_controller,
3871 #endif
3872         .ndo_add_slave          = bond_enslave,
3873         .ndo_del_slave          = bond_release,
3874         .ndo_fix_features       = bond_fix_features,
3875 };
3876 
3877 static const struct device_type bond_type = {
3878         .name = "bond",
3879 };
3880 
3881 static void bond_destructor(struct net_device *bond_dev)
3882 {
3883         struct bonding *bond = netdev_priv(bond_dev);
3884         if (bond->wq)
3885                 destroy_workqueue(bond->wq);
3886         free_netdev(bond_dev);
3887 }
3888 
3889 void bond_setup(struct net_device *bond_dev)
3890 {
3891         struct bonding *bond = netdev_priv(bond_dev);
3892 
3893         /* initialize rwlocks */
3894         rwlock_init(&bond->lock);
3895         rwlock_init(&bond->curr_slave_lock);
3896         bond->params = bonding_defaults;
3897 
3898         /* Initialize pointers */
3899         bond->dev = bond_dev;
3900 
3901         /* Initialize the device entry points */
3902         ether_setup(bond_dev);
3903         bond_dev->netdev_ops = &bond_netdev_ops;
3904         bond_dev->ethtool_ops = &bond_ethtool_ops;
3905 
3906         bond_dev->destructor = bond_destructor;
3907 
3908         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3909 
3910         /* Initialize the device options */
3911         bond_dev->tx_queue_len = 0;
3912         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3913         bond_dev->priv_flags |= IFF_BONDING;
3914         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3915 
3916         /* At first, we block adding VLANs. That's the only way to
3917          * prevent problems that occur when adding VLANs over an
3918          * empty bond. The block will be removed once non-challenged
3919          * slaves are enslaved.
3920          */
3921         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
3922 
3923         /* don't acquire bond device's netif_tx_lock when
3924          * transmitting */
3925         bond_dev->features |= NETIF_F_LLTX;
3926 
3927         /* By default, we declare the bond to be fully
3928          * VLAN hardware accelerated capable. Special
3929          * care is taken in the various xmit functions
3930          * when there are slaves that are not hw accel
3931          * capable
3932          */
3933 
3934         /* Don't allow bond devices to change network namespaces. */
3935         bond_dev->features |= NETIF_F_NETNS_LOCAL;
3936 
3937         bond_dev->hw_features = BOND_VLAN_FEATURES |
3938                                 NETIF_F_HW_VLAN_CTAG_TX |
3939                                 NETIF_F_HW_VLAN_CTAG_RX |
3940                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3941 
3942         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3943         bond_dev->features |= bond_dev->hw_features;
3944 }
3945 
3946 /*
3947 * Destroy a bonding device.
3948 * Must be under rtnl_lock when this function is called.
3949 */
3950 static void bond_uninit(struct net_device *bond_dev)
3951 {
3952         struct bonding *bond = netdev_priv(bond_dev);
3953         struct list_head *iter;
3954         struct slave *slave;
3955 
3956         bond_netpoll_cleanup(bond_dev);
3957 
3958         /* Release the bonded slaves */
3959         bond_for_each_slave(bond, slave, iter)
3960                 __bond_release_one(bond_dev, slave->dev, true);
3961         pr_info("%s: released all slaves\n", bond_dev->name);
3962 
3963         list_del(&bond->bond_list);
3964 
3965         bond_debug_unregister(bond);
3966 }
3967 
3968 /*------------------------- Module initialization ---------------------------*/
3969 
3970 int bond_parm_tbl_lookup(int mode, const struct bond_parm_tbl *tbl)
3971 {
3972         int i;
3973 
3974         for (i = 0; tbl[i].modename; i++)
3975                 if (mode == tbl[i].mode)
3976                         return tbl[i].mode;
3977 
3978         return -1;
3979 }
3980 
3981 static int bond_parm_tbl_lookup_name(const char *modename,
3982                                      const struct bond_parm_tbl *tbl)
3983 {
3984         int i;
3985 
3986         for (i = 0; tbl[i].modename; i++)
3987                 if (strcmp(modename, tbl[i].modename) == 0)
3988                         return tbl[i].mode;
3989 
3990         return -1;
3991 }
3992 
3993 /*
3994  * Convert string input module parms.  Accept either the
3995  * number of the mode or its string name.  A bit complicated because
3996  * some mode names are substrings of other names, and calls from sysfs
3997  * may have whitespace in the name (trailing newlines, for example).
3998  */
3999 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4000 {
4001         int modeint;
4002         char *p, modestr[BOND_MAX_MODENAME_LEN + 1];
4003 
4004         for (p = (char *)buf; *p; p++)
4005                 if (!(isdigit(*p) || isspace(*p)))
4006                         break;
4007 
4008         if (*p && sscanf(buf, "%20s", modestr) != 0)
4009                 return bond_parm_tbl_lookup_name(modestr, tbl);
4010         else if (sscanf(buf, "%d", &modeint) != 0)
4011                 return bond_parm_tbl_lookup(modeint, tbl);
4012 
4013         return -1;
4014 }
4015 
4016 static int bond_check_params(struct bond_params *params)
4017 {
4018         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4019         struct bond_opt_value newval, *valptr;
4020         int arp_all_targets_value;
4021 
4022         /*
4023          * Convert string parameters.
4024          */
4025         if (mode) {
4026                 bond_opt_initstr(&newval, mode);
4027                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4028                 if (!valptr) {
4029                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4030                         return -EINVAL;
4031                 }
4032                 bond_mode = valptr->value;
4033         }
4034 
4035         if (xmit_hash_policy) {
4036                 if ((bond_mode != BOND_MODE_XOR) &&
4037                     (bond_mode != BOND_MODE_8023AD)) {
4038                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4039                                bond_mode_name(bond_mode));
4040                 } else {
4041                         bond_opt_initstr(&newval, xmit_hash_policy);
4042                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4043                                                 &newval);
4044                         if (!valptr) {
4045                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4046                                        xmit_hash_policy);
4047                                 return -EINVAL;
4048                         }
4049                         xmit_hashtype = valptr->value;
4050                 }
4051         }
4052 
4053         if (lacp_rate) {
4054                 if (bond_mode != BOND_MODE_8023AD) {
4055                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4056                                 bond_mode_name(bond_mode));
4057                 } else {
4058                         bond_opt_initstr(&newval, lacp_rate);
4059                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4060                                                 &newval);
4061                         if (!valptr) {
4062                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4063                                        lacp_rate);
4064                                 return -EINVAL;
4065                         }
4066                         lacp_fast = valptr->value;
4067                 }
4068         }
4069 
4070         if (ad_select) {
4071                 bond_opt_initstr(&newval, lacp_rate);
4072                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4073                                         &newval);
4074                 if (!valptr) {
4075                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4076                         return -EINVAL;
4077                 }
4078                 params->ad_select = valptr->value;
4079                 if (bond_mode != BOND_MODE_8023AD)
4080                         pr_warning("ad_select param only affects 802.3ad mode\n");
4081         } else {
4082                 params->ad_select = BOND_AD_STABLE;
4083         }
4084 
4085         if (max_bonds < 0) {
4086                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4087                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4088                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4089         }
4090 
4091         if (miimon < 0) {
4092                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4093                            miimon, INT_MAX);
4094                 miimon = 0;
4095         }
4096 
4097         if (updelay < 0) {
4098                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4099                            updelay, INT_MAX);
4100                 updelay = 0;
4101         }
4102 
4103         if (downdelay < 0) {
4104                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4105                            downdelay, INT_MAX);
4106                 downdelay = 0;
4107         }
4108 
4109         if ((use_carrier != 0) && (use_carrier != 1)) {
4110                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4111                            use_carrier);
4112                 use_carrier = 1;
4113         }
4114 
4115         if (num_peer_notif < 0 || num_peer_notif > 255) {
4116                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4117                            num_peer_notif);
4118                 num_peer_notif = 1;
4119         }
4120 
4121         /* reset values for 802.3ad/TLB/ALB */
4122         if (BOND_NO_USES_ARP(bond_mode)) {
4123                 if (!miimon) {
4124                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4125                         pr_warning("Forcing miimon to 100msec\n");
4126                         miimon = BOND_DEFAULT_MIIMON;
4127                 }
4128         }
4129 
4130         if (tx_queues < 1 || tx_queues > 255) {
4131                 pr_warning("Warning: tx_queues (%d) should be between "
4132                            "1 and 255, resetting to %d\n",
4133                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4134                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4135         }
4136 
4137         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4138                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4139                            "not of valid value (0/1), so it was set to "
4140                            "\n", all_slaves_active);
4141                 all_slaves_active = 0;
4142         }
4143 
4144         if (resend_igmp < 0 || resend_igmp > 255) {
4145                 pr_warning("Warning: resend_igmp (%d) should be between "
4146                            "0 and 255, resetting to %d\n",
4147                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4148                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4149         }
4150 
4151         bond_opt_initval(&newval, packets_per_slave);
4152         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4153                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4154                         packets_per_slave, USHRT_MAX);
4155                 packets_per_slave = 1;
4156         }
4157 
4158         if (bond_mode == BOND_MODE_ALB) {
4159                 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4160                           updelay);
4161         }
4162 
4163         if (!miimon) {
4164                 if (updelay || downdelay) {
4165                         /* just warn the user the up/down delay will have
4166                          * no effect since miimon is zero...
4167                          */
4168                         pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4169                                    updelay, downdelay);
4170                 }
4171         } else {
4172                 /* don't allow arp monitoring */
4173                 if (arp_interval) {
4174                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4175                                    miimon, arp_interval);
4176                         arp_interval = 0;
4177                 }
4178 
4179                 if ((updelay % miimon) != 0) {
4180                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4181                                    updelay, miimon,
4182                                    (updelay / miimon) * miimon);
4183                 }
4184 
4185                 updelay /= miimon;
4186 
4187                 if ((downdelay % miimon) != 0) {
4188                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4189                                    downdelay, miimon,
4190                                    (downdelay / miimon) * miimon);
4191                 }
4192 
4193                 downdelay /= miimon;
4194         }
4195 
4196         if (arp_interval < 0) {
4197                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to 0\n",
4198                            arp_interval, INT_MAX);
4199                 arp_interval = 0;
4200         }
4201 
4202         for (arp_ip_count = 0, i = 0;
4203              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4204                 /* not complete check, but should be good enough to
4205                    catch mistakes */
4206                 __be32 ip;
4207                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4208                     IS_IP_TARGET_UNUSABLE_ADDRESS(ip)) {
4209                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4210                                    arp_ip_target[i]);
4211                         arp_interval = 0;
4212                 } else {
4213                         if (bond_get_targets_ip(arp_target, ip) == -1)
4214                                 arp_target[arp_ip_count++] = ip;
4215                         else
4216                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4217                                            &ip);
4218                 }
4219         }
4220 
4221         if (arp_interval && !arp_ip_count) {
4222                 /* don't allow arping if no arp_ip_target given... */
4223                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4224                            arp_interval);
4225                 arp_interval = 0;
4226         }
4227 
4228         if (arp_validate) {
4229                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4230                         pr_err("arp_validate only supported in active-backup mode\n");
4231                         return -EINVAL;
4232                 }
4233                 if (!arp_interval) {
4234                         pr_err("arp_validate requires arp_interval\n");
4235                         return -EINVAL;
4236                 }
4237 
4238                 bond_opt_initstr(&newval, arp_validate);
4239                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4240                                         &newval);
4241                 if (!valptr) {
4242                         pr_err("Error: invalid arp_validate \"%s\"\n",
4243                                arp_validate);
4244                         return -EINVAL;
4245                 }
4246                 arp_validate_value = valptr->value;
4247         } else {
4248                 arp_validate_value = 0;
4249         }
4250 
4251         arp_all_targets_value = 0;
4252         if (arp_all_targets) {
4253                 bond_opt_initstr(&newval, arp_all_targets);
4254                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4255                                         &newval);
4256                 if (!valptr) {
4257                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4258                                arp_all_targets);
4259                         arp_all_targets_value = 0;
4260                 } else {
4261                         arp_all_targets_value = valptr->value;
4262                 }
4263         }
4264 
4265         if (miimon) {
4266                 pr_info("MII link monitoring set to %d ms\n", miimon);
4267         } else if (arp_interval) {
4268                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4269                                           arp_validate_value);
4270                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4271                         arp_interval, valptr->string, arp_ip_count);
4272 
4273                 for (i = 0; i < arp_ip_count; i++)
4274                         pr_info(" %s", arp_ip_target[i]);
4275 
4276                 pr_info("\n");
4277 
4278         } else if (max_bonds) {
4279                 /* miimon and arp_interval not set, we need one so things
4280                  * work as expected, see bonding.txt for details
4281                  */
4282                 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n");
4283         }
4284 
4285         if (primary && !USES_PRIMARY(bond_mode)) {
4286                 /* currently, using a primary only makes sense
4287                  * in active backup, TLB or ALB modes
4288                  */
4289                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4290                            primary, bond_mode_name(bond_mode));
4291                 primary = NULL;
4292         }
4293 
4294         if (primary && primary_reselect) {
4295                 bond_opt_initstr(&newval, primary_reselect);
4296                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4297                                         &newval);
4298                 if (!valptr) {
4299                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4300                                primary_reselect);
4301                         return -EINVAL;
4302                 }
4303                 primary_reselect_value = valptr->value;
4304         } else {
4305                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4306         }
4307 
4308         if (fail_over_mac) {
4309                 bond_opt_initstr(&newval, fail_over_mac);
4310                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4311                                         &newval);
4312                 if (!valptr) {
4313                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4314                                fail_over_mac);
4315                         return -EINVAL;
4316                 }
4317                 fail_over_mac_value = valptr->value;
4318                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4319                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4320         } else {
4321                 fail_over_mac_value = BOND_FOM_NONE;
4322         }
4323 
4324         if (lp_interval == 0) {
4325                 pr_warning("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4326                            INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4327                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4328         }
4329 
4330         /* fill params struct with the proper values */
4331         params->mode = bond_mode;
4332         params->xmit_policy = xmit_hashtype;
4333         params->miimon = miimon;
4334         params->num_peer_notif = num_peer_notif;
4335         params->arp_interval = arp_interval;
4336         params->arp_validate = arp_validate_value;
4337         params->arp_all_targets = arp_all_targets_value;
4338         params->updelay = updelay;
4339         params->downdelay = downdelay;
4340         params->use_carrier = use_carrier;
4341         params->lacp_fast = lacp_fast;
4342         params->primary[0] = 0;
4343         params->primary_reselect = primary_reselect_value;
4344         params->fail_over_mac = fail_over_mac_value;
4345         params->tx_queues = tx_queues;
4346         params->all_slaves_active = all_slaves_active;
4347         params->resend_igmp = resend_igmp;
4348         params->min_links = min_links;
4349         params->lp_interval = lp_interval;
4350         params->packets_per_slave = packets_per_slave;
4351         if (packets_per_slave > 0) {
4352                 params->reciprocal_packets_per_slave =
4353                         reciprocal_value(packets_per_slave);
4354         } else {
4355                 /* reciprocal_packets_per_slave is unused if
4356                  * packets_per_slave is 0 or 1, just initialize it
4357                  */
4358                 params->reciprocal_packets_per_slave =
4359                         (struct reciprocal_value) { 0 };
4360         }
4361 
4362         if (primary) {
4363                 strncpy(params->primary, primary, IFNAMSIZ);
4364                 params->primary[IFNAMSIZ - 1] = 0;
4365         }
4366 
4367         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4368 
4369         return 0;
4370 }
4371 
4372 static struct lock_class_key bonding_netdev_xmit_lock_key;
4373 static struct lock_class_key bonding_netdev_addr_lock_key;
4374 static struct lock_class_key bonding_tx_busylock_key;
4375 
4376 static void bond_set_lockdep_class_one(struct net_device *dev,
4377                                        struct netdev_queue *txq,
4378                                        void *_unused)
4379 {
4380         lockdep_set_class(&txq->_xmit_lock,
4381                           &bonding_netdev_xmit_lock_key);
4382 }
4383 
4384 static void bond_set_lockdep_class(struct net_device *dev)
4385 {
4386         lockdep_set_class(&dev->addr_list_lock,
4387                           &bonding_netdev_addr_lock_key);
4388         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4389         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4390 }
4391 
4392 /*
4393  * Called from registration process
4394  */
4395 static int bond_init(struct net_device *bond_dev)
4396 {
4397         struct bonding *bond = netdev_priv(bond_dev);
4398         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4399         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4400 
4401         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4402 
4403         /*
4404          * Initialize locks that may be required during
4405          * en/deslave operations.  All of the bond_open work
4406          * (of which this is part) should really be moved to
4407          * a phase prior to dev_open
4408          */
4409         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4410         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4411 
4412         bond->wq = create_singlethread_workqueue(bond_dev->name);
4413         if (!bond->wq)
4414                 return -ENOMEM;
4415 
4416         bond_set_lockdep_class(bond_dev);
4417 
4418         list_add_tail(&bond->bond_list, &bn->dev_list);
4419 
4420         bond_prepare_sysfs_group(bond);
4421 
4422         bond_debug_register(bond);
4423 
4424         /* Ensure valid dev_addr */
4425         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4426             bond_dev->addr_assign_type == NET_ADDR_PERM)
4427                 eth_hw_addr_random(bond_dev);
4428 
4429         return 0;
4430 }
4431 
4432 unsigned int bond_get_num_tx_queues(void)
4433 {
4434         return tx_queues;
4435 }
4436 
4437 /* Create a new bond based on the specified name and bonding parameters.
4438  * If name is NULL, obtain a suitable "bond%d" name for us.
4439  * Caller must NOT hold rtnl_lock; we need to release it here before we
4440  * set up our sysfs entries.
4441  */
4442 int bond_create(struct net *net, const char *name)
4443 {
4444         struct net_device *bond_dev;
4445         int res;
4446 
4447         rtnl_lock();
4448 
4449         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4450                                    name ? name : "bond%d",
4451                                    bond_setup, tx_queues);
4452         if (!bond_dev) {
4453                 pr_err("%s: eek! can't alloc netdev!\n", name);
4454                 rtnl_unlock();
4455                 return -ENOMEM;
4456         }
4457 
4458         dev_net_set(bond_dev, net);
4459         bond_dev->rtnl_link_ops = &bond_link_ops;
4460 
4461         res = register_netdevice(bond_dev);
4462 
4463         netif_carrier_off(bond_dev);
4464 
4465         rtnl_unlock();
4466         if (res < 0)
4467                 bond_destructor(bond_dev);
4468         return res;
4469 }
4470 
4471 static int __net_init bond_net_init(struct net *net)
4472 {
4473         struct bond_net *bn = net_generic(net, bond_net_id);
4474 
4475         bn->net = net;
4476         INIT_LIST_HEAD(&bn->dev_list);
4477 
4478         bond_create_proc_dir(bn);
4479         bond_create_sysfs(bn);
4480 
4481         return 0;
4482 }
4483 
4484 static void __net_exit bond_net_exit(struct net *net)
4485 {
4486         struct bond_net *bn = net_generic(net, bond_net_id);
4487         struct bonding *bond, *tmp_bond;
4488         LIST_HEAD(list);
4489 
4490         bond_destroy_sysfs(bn);
4491         bond_destroy_proc_dir(bn);
4492 
4493         /* Kill off any bonds created after unregistering bond rtnl ops */
4494         rtnl_lock();
4495         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4496                 unregister_netdevice_queue(bond->dev, &list);
4497         unregister_netdevice_many(&list);
4498         rtnl_unlock();
4499 }
4500 
4501 static struct pernet_operations bond_net_ops = {
4502         .init = bond_net_init,
4503         .exit = bond_net_exit,
4504         .id   = &bond_net_id,
4505         .size = sizeof(struct bond_net),
4506 };
4507 
4508 static int __init bonding_init(void)
4509 {
4510         int i;
4511         int res;
4512 
4513         pr_info("%s", bond_version);
4514 
4515         res = bond_check_params(&bonding_defaults);
4516         if (res)
4517                 goto out;
4518 
4519         res = register_pernet_subsys(&bond_net_ops);
4520         if (res)
4521                 goto out;
4522 
4523         res = bond_netlink_init();
4524         if (res)
4525                 goto err_link;
4526 
4527         bond_create_debugfs();
4528 
4529         for (i = 0; i < max_bonds; i++) {
4530                 res = bond_create(&init_net, NULL);
4531                 if (res)
4532                         goto err;
4533         }
4534 
4535         register_netdevice_notifier(&bond_netdev_notifier);
4536 out:
4537         return res;
4538 err:
4539         bond_netlink_fini();
4540 err_link:
4541         unregister_pernet_subsys(&bond_net_ops);
4542         goto out;
4543 
4544 }
4545 
4546 static void __exit bonding_exit(void)
4547 {
4548         unregister_netdevice_notifier(&bond_netdev_notifier);
4549 
4550         bond_destroy_debugfs();
4551 
4552         bond_netlink_fini();
4553         unregister_pernet_subsys(&bond_net_ops);
4554 
4555 #ifdef CONFIG_NET_POLL_CONTROLLER
4556         /*
4557          * Make sure we don't have an imbalance on our netpoll blocking
4558          */
4559         WARN_ON(atomic_read(&netpoll_block_tx));
4560 #endif
4561 }
4562 
4563 module_init(bonding_init);
4564 module_exit(bonding_exit);
4565 MODULE_LICENSE("GPL");
4566 MODULE_VERSION(DRV_VERSION);
4567 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4568 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4569 

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