2 * originally based on the dummy device.
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
7 * bonding.c: an Ethernet Bonding driver
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
14 * and probably many L2 switches ...
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.
24 * will release all slaves, marking them as down.
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.
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
44 #include <linux/tcp.h>
45 #include <linux/udp.h>
46 #include <linux/slab.h>
47 #include <linux/string.h>
48 #include <linux/init.h>
49 #include <linux/timer.h>
50 #include <linux/socket.h>
51 #include <linux/ctype.h>
52 #include <linux/inet.h>
53 #include <linux/bitops.h>
56 #include <linux/uaccess.h>
57 #include <linux/errno.h>
58 #include <linux/netdevice.h>
59 #include <linux/inetdevice.h>
60 #include <linux/igmp.h>
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
64 #include <linux/rtnetlink.h>
65 #include <linux/smp.h>
66 #include <linux/if_ether.h>
68 #include <linux/mii.h>
69 #include <linux/ethtool.h>
70 #include <linux/if_vlan.h>
71 #include <linux/if_bonding.h>
72 #include <linux/jiffies.h>
73 #include <linux/preempt.h>
74 #include <net/route.h>
75 #include <net/net_namespace.h>
76 #include <net/netns/generic.h>
77 #include <net/pkt_sched.h>
78 #include <linux/rculist.h>
79 #include <net/flow_keys.h>
80 #include <net/switchdev.h>
81 #include <net/bonding.h>
82 #include <net/bond_3ad.h>
83 #include <net/bond_alb.h>
85 #include "bonding_priv.h"
87 /*---------------------------- Module parameters ----------------------------*/
89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
91 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
92 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
93 static int num_peer_notif = 1;
97 static int use_carrier = 1;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *arp_all_targets;
109 static char *fail_over_mac;
110 static int all_slaves_active;
111 static struct bond_params bonding_defaults;
112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
113 static int packets_per_slave = 1;
114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
116 module_param(max_bonds, int, 0);
117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
118 module_param(tx_queues, int, 0);
119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
122 "failover event (alias of num_unsol_na)");
123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
125 "failover event (alias of num_grat_arp)");
126 module_param(miimon, int, 0);
127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
128 module_param(updelay, int, 0);
129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
130 module_param(downdelay, int, 0);
131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
133 module_param(use_carrier, int, 0);
134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
135 "0 for off, 1 for on (default)");
136 module_param(mode, charp, 0);
137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
138 "1 for active-backup, 2 for balance-xor, "
139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
140 "6 for balance-alb");
141 module_param(primary, charp, 0);
142 MODULE_PARM_DESC(primary, "Primary network device to use");
143 module_param(primary_reselect, charp, 0);
144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
146 "0 for always (default), "
147 "1 for only if speed of primary is "
149 "2 for only on active slave "
151 module_param(lacp_rate, charp, 0);
152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
153 "0 for slow, 1 for fast");
154 module_param(ad_select, charp, 0);
155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
156 "0 for stable (default), 1 for bandwidth, "
158 module_param(min_links, int, 0);
159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
161 module_param(xmit_hash_policy, charp, 0);
162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
163 "0 for layer 2 (default), 1 for layer 3+4, "
164 "2 for layer 2+3, 3 for encap layer 2+3, "
165 "4 for encap layer 3+4");
166 module_param(arp_interval, int, 0);
167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
168 module_param_array(arp_ip_target, charp, NULL, 0);
169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
170 module_param(arp_validate, charp, 0);
171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
172 "0 for none (default), 1 for active, "
173 "2 for backup, 3 for all");
174 module_param(arp_all_targets, charp, 0);
175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
176 module_param(fail_over_mac, charp, 0);
177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
178 "the same MAC; 0 for none (default), "
179 "1 for active, 2 for follow");
180 module_param(all_slaves_active, int, 0);
181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
182 "by setting active flag for all slaves; "
183 "0 for never (default), 1 for always.");
184 module_param(resend_igmp, int, 0);
185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
187 module_param(packets_per_slave, int, 0);
188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
189 "mode; 0 for a random slave, 1 packet per "
190 "slave (default), >1 packets per slave.");
191 module_param(lp_interval, uint, 0);
192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
193 "the bonding driver sends learning packets to "
194 "each slaves peer switch. The default is 1.");
196 /*----------------------------- Global variables ----------------------------*/
198 #ifdef CONFIG_NET_POLL_CONTROLLER
199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
202 int bond_net_id __read_mostly;
204 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
205 static int arp_ip_count;
206 static int bond_mode = BOND_MODE_ROUNDROBIN;
207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
208 static int lacp_fast;
210 /*-------------------------- Forward declarations ---------------------------*/
212 static int bond_init(struct net_device *bond_dev);
213 static void bond_uninit(struct net_device *bond_dev);
214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
215 struct rtnl_link_stats64 *stats);
216 static void bond_slave_arr_handler(struct work_struct *work);
218 /*---------------------------- General routines -----------------------------*/
220 const char *bond_mode_name(int mode)
222 static const char *names[] = {
223 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
224 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
225 [BOND_MODE_XOR] = "load balancing (xor)",
226 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
227 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
228 [BOND_MODE_TLB] = "transmit load balancing",
229 [BOND_MODE_ALB] = "adaptive load balancing",
232 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
238 /*---------------------------------- VLAN -----------------------------------*/
241 * bond_dev_queue_xmit - Prepare skb for xmit.
243 * @bond: bond device that got this skb for tx.
244 * @skb: hw accel VLAN tagged skb to transmit
245 * @slave_dev: slave that is supposed to xmit this skbuff
247 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
248 struct net_device *slave_dev)
250 skb->dev = slave_dev;
252 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
253 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
254 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
256 if (unlikely(netpoll_tx_running(bond->dev)))
257 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
262 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
263 * We don't protect the slave list iteration with a lock because:
264 * a. This operation is performed in IOCTL context,
265 * b. The operation is protected by the RTNL semaphore in the 8021q code,
266 * c. Holding a lock with BH disabled while directly calling a base driver
267 * entry point is generally a BAD idea.
269 * The design of synchronization/protection for this operation in the 8021q
270 * module is good for one or more VLAN devices over a single physical device
271 * and cannot be extended for a teaming solution like bonding, so there is a
272 * potential race condition here where a net device from the vlan group might
273 * be referenced (either by a base driver or the 8021q code) while it is being
274 * removed from the system. However, it turns out we're not making matters
275 * worse, and if it works for regular VLAN usage it will work here too.
279 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
280 * @bond_dev: bonding net device that got called
281 * @vid: vlan id being added
283 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
284 __be16 proto, u16 vid)
286 struct bonding *bond = netdev_priv(bond_dev);
287 struct slave *slave, *rollback_slave;
288 struct list_head *iter;
291 bond_for_each_slave(bond, slave, iter) {
292 res = vlan_vid_add(slave->dev, proto, vid);
300 /* unwind to the slave that failed */
301 bond_for_each_slave(bond, rollback_slave, iter) {
302 if (rollback_slave == slave)
305 vlan_vid_del(rollback_slave->dev, proto, vid);
312 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
313 * @bond_dev: bonding net device that got called
314 * @vid: vlan id being removed
316 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
317 __be16 proto, u16 vid)
319 struct bonding *bond = netdev_priv(bond_dev);
320 struct list_head *iter;
323 bond_for_each_slave(bond, slave, iter)
324 vlan_vid_del(slave->dev, proto, vid);
326 if (bond_is_lb(bond))
327 bond_alb_clear_vlan(bond, vid);
332 /*------------------------------- Link status -------------------------------*/
334 /* Set the carrier state for the master according to the state of its
335 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
336 * do special 802.3ad magic.
338 * Returns zero if carrier state does not change, nonzero if it does.
340 int bond_set_carrier(struct bonding *bond)
342 struct list_head *iter;
345 if (!bond_has_slaves(bond))
348 if (BOND_MODE(bond) == BOND_MODE_8023AD)
349 return bond_3ad_set_carrier(bond);
351 bond_for_each_slave(bond, slave, iter) {
352 if (slave->link == BOND_LINK_UP) {
353 if (!netif_carrier_ok(bond->dev)) {
354 netif_carrier_on(bond->dev);
362 if (netif_carrier_ok(bond->dev)) {
363 netif_carrier_off(bond->dev);
369 /* Get link speed and duplex from the slave's base driver
370 * using ethtool. If for some reason the call fails or the
371 * values are invalid, set speed and duplex to -1,
374 static void bond_update_speed_duplex(struct slave *slave)
376 struct net_device *slave_dev = slave->dev;
377 struct ethtool_cmd ecmd;
381 slave->speed = SPEED_UNKNOWN;
382 slave->duplex = DUPLEX_UNKNOWN;
384 res = __ethtool_get_settings(slave_dev, &ecmd);
388 slave_speed = ethtool_cmd_speed(&ecmd);
389 if (slave_speed == 0 || slave_speed == ((__u32) -1))
392 switch (ecmd.duplex) {
400 slave->speed = slave_speed;
401 slave->duplex = ecmd.duplex;
406 const char *bond_slave_link_status(s8 link)
422 /* if <dev> supports MII link status reporting, check its link status.
424 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425 * depending upon the setting of the use_carrier parameter.
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
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.
437 static int bond_check_dev_link(struct bonding *bond,
438 struct net_device *slave_dev, int reporting)
440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441 int (*ioctl)(struct net_device *, struct ifreq *, int);
443 struct mii_ioctl_data *mii;
445 if (!reporting && !netif_running(slave_dev))
448 if (bond->params.use_carrier)
449 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
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) ?
456 /* Ethtool can't be used, fallback to MII ioctls. */
457 ioctl = slave_ops->ndo_do_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
466 /* We cannot assume that SIOCGMIIPHY will also read a
467 * register; not all network drivers (e.g., e100)
471 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
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;
481 /* If reporting, report that either there's no dev->do_ioctl,
482 * or both SIOCGMIIREG and get_link failed (meaning that we
483 * cannot report link status). If not reporting, pretend
486 return reporting ? -1 : BMSR_LSTATUS;
489 /*----------------------------- Multicast list ------------------------------*/
491 /* Push the promiscuity flag down to appropriate slaves */
492 static int bond_set_promiscuity(struct bonding *bond, int inc)
494 struct list_head *iter;
497 if (bond_uses_primary(bond)) {
498 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
501 err = dev_set_promiscuity(curr_active->dev, inc);
505 bond_for_each_slave(bond, slave, iter) {
506 err = dev_set_promiscuity(slave->dev, inc);
514 /* Push the allmulti flag down to all slaves */
515 static int bond_set_allmulti(struct bonding *bond, int inc)
517 struct list_head *iter;
520 if (bond_uses_primary(bond)) {
521 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
524 err = dev_set_allmulti(curr_active->dev, inc);
528 bond_for_each_slave(bond, slave, iter) {
529 err = dev_set_allmulti(slave->dev, inc);
537 /* Retrieve the list of registered multicast addresses for the bonding
538 * device and retransmit an IGMP JOIN request to the current active
541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
543 struct bonding *bond = container_of(work, struct bonding,
546 if (!rtnl_trylock()) {
547 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
550 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
552 if (bond->igmp_retrans > 1) {
553 bond->igmp_retrans--;
554 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
559 /* Flush bond's hardware addresses from slave */
560 static void bond_hw_addr_flush(struct net_device *bond_dev,
561 struct net_device *slave_dev)
563 struct bonding *bond = netdev_priv(bond_dev);
565 dev_uc_unsync(slave_dev, bond_dev);
566 dev_mc_unsync(slave_dev, bond_dev);
568 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
569 /* del lacpdu mc addr from mc list */
570 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
572 dev_mc_del(slave_dev, lacpdu_multicast);
576 /*--------------------------- Active slave change ---------------------------*/
578 /* Update the hardware address list and promisc/allmulti for the new and
579 * old active slaves (if any). Modes that are not using primary keep all
580 * slaves up date at all times; only the modes that use primary need to call
581 * this function to swap these settings during a failover.
583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
584 struct slave *old_active)
587 if (bond->dev->flags & IFF_PROMISC)
588 dev_set_promiscuity(old_active->dev, -1);
590 if (bond->dev->flags & IFF_ALLMULTI)
591 dev_set_allmulti(old_active->dev, -1);
593 bond_hw_addr_flush(bond->dev, old_active->dev);
597 /* FIXME: Signal errors upstream. */
598 if (bond->dev->flags & IFF_PROMISC)
599 dev_set_promiscuity(new_active->dev, 1);
601 if (bond->dev->flags & IFF_ALLMULTI)
602 dev_set_allmulti(new_active->dev, 1);
604 netif_addr_lock_bh(bond->dev);
605 dev_uc_sync(new_active->dev, bond->dev);
606 dev_mc_sync(new_active->dev, bond->dev);
607 netif_addr_unlock_bh(bond->dev);
612 * bond_set_dev_addr - clone slave's address to bond
613 * @bond_dev: bond net device
614 * @slave_dev: slave net device
616 * Should be called with RTNL held.
618 static void bond_set_dev_addr(struct net_device *bond_dev,
619 struct net_device *slave_dev)
621 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
622 bond_dev, slave_dev, slave_dev->addr_len);
623 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
624 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
625 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
628 static struct slave *bond_get_old_active(struct bonding *bond,
629 struct slave *new_active)
632 struct list_head *iter;
634 bond_for_each_slave(bond, slave, iter) {
635 if (slave == new_active)
638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
645 /* bond_do_fail_over_mac
647 * Perform special MAC address swapping for fail_over_mac settings
651 static void bond_do_fail_over_mac(struct bonding *bond,
652 struct slave *new_active,
653 struct slave *old_active)
655 u8 tmp_mac[ETH_ALEN];
656 struct sockaddr saddr;
659 switch (bond->params.fail_over_mac) {
660 case BOND_FOM_ACTIVE:
662 bond_set_dev_addr(bond->dev, new_active->dev);
664 case BOND_FOM_FOLLOW:
665 /* if new_active && old_active, swap them
666 * if just old_active, do nothing (going to no active slave)
667 * if just new_active, set new_active to bond's MAC
673 old_active = bond_get_old_active(bond, new_active);
676 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
677 ether_addr_copy(saddr.sa_data,
678 old_active->dev->dev_addr);
679 saddr.sa_family = new_active->dev->type;
681 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
682 saddr.sa_family = bond->dev->type;
685 rv = dev_set_mac_address(new_active->dev, &saddr);
687 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
688 -rv, new_active->dev->name);
695 ether_addr_copy(saddr.sa_data, tmp_mac);
696 saddr.sa_family = old_active->dev->type;
698 rv = dev_set_mac_address(old_active->dev, &saddr);
700 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
701 -rv, new_active->dev->name);
705 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
706 bond->params.fail_over_mac);
712 static bool bond_should_change_active(struct bonding *bond)
714 struct slave *prim = rtnl_dereference(bond->primary_slave);
715 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
717 if (!prim || !curr || curr->link != BOND_LINK_UP)
719 if (bond->force_primary) {
720 bond->force_primary = false;
723 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
724 (prim->speed < curr->speed ||
725 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
727 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
733 * find_best_interface - select the best available slave to be the active one
734 * @bond: our bonding struct
736 static struct slave *bond_find_best_slave(struct bonding *bond)
738 struct slave *slave, *bestslave = NULL, *primary;
739 struct list_head *iter;
740 int mintime = bond->params.updelay;
742 primary = rtnl_dereference(bond->primary_slave);
743 if (primary && primary->link == BOND_LINK_UP &&
744 bond_should_change_active(bond))
747 bond_for_each_slave(bond, slave, iter) {
748 if (slave->link == BOND_LINK_UP)
750 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
751 slave->delay < mintime) {
752 mintime = slave->delay;
760 static bool bond_should_notify_peers(struct bonding *bond)
765 slave = rcu_dereference(bond->curr_active_slave);
768 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
769 slave ? slave->dev->name : "NULL");
771 if (!slave || !bond->send_peer_notif ||
772 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
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
783 * Set the new slave to the bond's settings and unset them on the old
785 * Setting include flags, mc-list, promiscuity, allmulti, etc.
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.
791 * Caller must hold RTNL.
793 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
795 struct slave *old_active;
799 old_active = rtnl_dereference(bond->curr_active_slave);
801 if (old_active == new_active)
805 new_active->last_link_up = jiffies;
807 if (new_active->link == BOND_LINK_BACK) {
808 if (bond_uses_primary(bond)) {
809 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
810 new_active->dev->name,
811 (bond->params.updelay - new_active->delay) * bond->params.miimon);
814 new_active->delay = 0;
815 bond_set_slave_link_state(new_active, BOND_LINK_UP);
817 if (BOND_MODE(bond) == BOND_MODE_8023AD)
818 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
820 if (bond_is_lb(bond))
821 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
823 if (bond_uses_primary(bond)) {
824 netdev_info(bond->dev, "making interface %s the new active one\n",
825 new_active->dev->name);
830 if (bond_uses_primary(bond))
831 bond_hw_addr_swap(bond, new_active, old_active);
833 if (bond_is_lb(bond)) {
834 bond_alb_handle_active_change(bond, new_active);
836 bond_set_slave_inactive_flags(old_active,
837 BOND_SLAVE_NOTIFY_NOW);
839 bond_set_slave_active_flags(new_active,
840 BOND_SLAVE_NOTIFY_NOW);
842 rcu_assign_pointer(bond->curr_active_slave, new_active);
845 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
847 bond_set_slave_inactive_flags(old_active,
848 BOND_SLAVE_NOTIFY_NOW);
851 bool should_notify_peers = false;
853 bond_set_slave_active_flags(new_active,
854 BOND_SLAVE_NOTIFY_NOW);
856 if (bond->params.fail_over_mac)
857 bond_do_fail_over_mac(bond, new_active,
860 if (netif_running(bond->dev)) {
861 bond->send_peer_notif =
862 bond->params.num_peer_notif;
863 should_notify_peers =
864 bond_should_notify_peers(bond);
867 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
868 if (should_notify_peers)
869 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
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
879 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
880 ((bond_uses_primary(bond) && new_active) ||
881 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
882 bond->igmp_retrans = bond->params.resend_igmp;
883 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
888 * bond_select_active_slave - select a new active slave, if needed
889 * @bond: our bonding struct
891 * This functions should be called when one of the following occurs:
892 * - The old curr_active_slave has been released or lost its link.
893 * - The primary_slave has got its link back.
894 * - A slave has got its link back and there's no old curr_active_slave.
896 * Caller must hold RTNL.
898 void bond_select_active_slave(struct bonding *bond)
900 struct slave *best_slave;
905 best_slave = bond_find_best_slave(bond);
906 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
907 bond_change_active_slave(bond, best_slave);
908 rv = bond_set_carrier(bond);
912 if (netif_carrier_ok(bond->dev)) {
913 netdev_info(bond->dev, "first active interface up!\n");
915 netdev_info(bond->dev, "now running without any active interface!\n");
920 #ifdef CONFIG_NET_POLL_CONTROLLER
921 static inline int slave_enable_netpoll(struct slave *slave)
926 np = kzalloc(sizeof(*np), GFP_KERNEL);
931 err = __netpoll_setup(np, slave->dev);
940 static inline void slave_disable_netpoll(struct slave *slave)
942 struct netpoll *np = slave->np;
948 __netpoll_free_async(np);
951 static void bond_poll_controller(struct net_device *bond_dev)
953 struct bonding *bond = netdev_priv(bond_dev);
954 struct slave *slave = NULL;
955 struct list_head *iter;
956 struct ad_info ad_info;
957 struct netpoll_info *ni;
958 const struct net_device_ops *ops;
960 if (BOND_MODE(bond) == BOND_MODE_8023AD)
961 if (bond_3ad_get_active_agg_info(bond, &ad_info))
965 bond_for_each_slave_rcu(bond, slave, iter) {
966 ops = slave->dev->netdev_ops;
967 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
970 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
971 struct aggregator *agg =
972 SLAVE_AD_INFO(slave)->port.aggregator;
975 agg->aggregator_identifier != ad_info.aggregator_id)
979 ni = rcu_dereference_bh(slave->dev->npinfo);
980 if (down_trylock(&ni->dev_lock))
982 ops->ndo_poll_controller(slave->dev);
985 rcu_read_unlock_bh();
988 static void bond_netpoll_cleanup(struct net_device *bond_dev)
990 struct bonding *bond = netdev_priv(bond_dev);
991 struct list_head *iter;
994 bond_for_each_slave(bond, slave, iter)
995 if (bond_slave_is_up(slave))
996 slave_disable_netpoll(slave);
999 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1001 struct bonding *bond = netdev_priv(dev);
1002 struct list_head *iter;
1003 struct slave *slave;
1006 bond_for_each_slave(bond, slave, iter) {
1007 err = slave_enable_netpoll(slave);
1009 bond_netpoll_cleanup(dev);
1016 static inline int slave_enable_netpoll(struct slave *slave)
1020 static inline void slave_disable_netpoll(struct slave *slave)
1023 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1028 /*---------------------------------- IOCTL ----------------------------------*/
1030 static netdev_features_t bond_fix_features(struct net_device *dev,
1031 netdev_features_t features)
1033 struct bonding *bond = netdev_priv(dev);
1034 struct list_head *iter;
1035 netdev_features_t mask;
1036 struct slave *slave;
1038 /* If any slave has the offload feature flag set,
1039 * set the offload flag on the bond.
1041 mask = features | NETIF_F_HW_SWITCH_OFFLOAD;
1043 features &= ~NETIF_F_ONE_FOR_ALL;
1044 features |= NETIF_F_ALL_FOR_ALL;
1046 bond_for_each_slave(bond, slave, iter) {
1047 features = netdev_increment_features(features,
1048 slave->dev->features,
1051 features = netdev_add_tso_features(features, mask);
1056 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1057 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1058 NETIF_F_HIGHDMA | NETIF_F_LRO)
1060 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1063 static void bond_compute_features(struct bonding *bond)
1065 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1066 IFF_XMIT_DST_RELEASE_PERM;
1067 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1068 netdev_features_t enc_features = BOND_ENC_FEATURES;
1069 struct net_device *bond_dev = bond->dev;
1070 struct list_head *iter;
1071 struct slave *slave;
1072 unsigned short max_hard_header_len = ETH_HLEN;
1073 unsigned int gso_max_size = GSO_MAX_SIZE;
1074 u16 gso_max_segs = GSO_MAX_SEGS;
1076 if (!bond_has_slaves(bond))
1078 vlan_features &= NETIF_F_ALL_FOR_ALL;
1080 bond_for_each_slave(bond, slave, iter) {
1081 vlan_features = netdev_increment_features(vlan_features,
1082 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1084 enc_features = netdev_increment_features(enc_features,
1085 slave->dev->hw_enc_features,
1087 dst_release_flag &= slave->dev->priv_flags;
1088 if (slave->dev->hard_header_len > max_hard_header_len)
1089 max_hard_header_len = slave->dev->hard_header_len;
1091 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1092 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1096 bond_dev->vlan_features = vlan_features;
1097 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1098 bond_dev->hard_header_len = max_hard_header_len;
1099 bond_dev->gso_max_segs = gso_max_segs;
1100 netif_set_gso_max_size(bond_dev, gso_max_size);
1102 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1103 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1104 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1105 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1107 netdev_change_features(bond_dev);
1110 static void bond_setup_by_slave(struct net_device *bond_dev,
1111 struct net_device *slave_dev)
1113 bond_dev->header_ops = slave_dev->header_ops;
1115 bond_dev->type = slave_dev->type;
1116 bond_dev->hard_header_len = slave_dev->hard_header_len;
1117 bond_dev->addr_len = slave_dev->addr_len;
1119 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1120 slave_dev->addr_len);
1123 /* On bonding slaves other than the currently active slave, suppress
1124 * duplicates except for alb non-mcast/bcast.
1126 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1127 struct slave *slave,
1128 struct bonding *bond)
1130 if (bond_is_slave_inactive(slave)) {
1131 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1132 skb->pkt_type != PACKET_BROADCAST &&
1133 skb->pkt_type != PACKET_MULTICAST)
1140 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1142 struct sk_buff *skb = *pskb;
1143 struct slave *slave;
1144 struct bonding *bond;
1145 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1147 int ret = RX_HANDLER_ANOTHER;
1149 skb = skb_share_check(skb, GFP_ATOMIC);
1151 return RX_HANDLER_CONSUMED;
1155 slave = bond_slave_get_rcu(skb->dev);
1158 recv_probe = ACCESS_ONCE(bond->recv_probe);
1160 ret = recv_probe(skb, bond, slave);
1161 if (ret == RX_HANDLER_CONSUMED) {
1167 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1168 return RX_HANDLER_EXACT;
1171 skb->dev = bond->dev;
1173 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1174 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1175 skb->pkt_type == PACKET_HOST) {
1177 if (unlikely(skb_cow_head(skb,
1178 skb->data - skb_mac_header(skb)))) {
1180 return RX_HANDLER_CONSUMED;
1182 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1188 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1189 struct net_device *slave_dev,
1190 struct slave *slave)
1194 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1197 slave_dev->flags |= IFF_SLAVE;
1198 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1202 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1203 struct net_device *slave_dev)
1205 netdev_upper_dev_unlink(slave_dev, bond_dev);
1206 slave_dev->flags &= ~IFF_SLAVE;
1207 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1210 static struct slave *bond_alloc_slave(struct bonding *bond)
1212 struct slave *slave = NULL;
1214 slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1218 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1219 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1221 if (!SLAVE_AD_INFO(slave)) {
1229 static void bond_free_slave(struct slave *slave)
1231 struct bonding *bond = bond_get_bond_by_slave(slave);
1233 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1234 kfree(SLAVE_AD_INFO(slave));
1239 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1241 info->bond_mode = BOND_MODE(bond);
1242 info->miimon = bond->params.miimon;
1243 info->num_slaves = bond->slave_cnt;
1246 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1248 strcpy(info->slave_name, slave->dev->name);
1249 info->link = slave->link;
1250 info->state = bond_slave_state(slave);
1251 info->link_failure_count = slave->link_failure_count;
1254 static void bond_netdev_notify(struct net_device *dev,
1255 struct netdev_bonding_info *info)
1258 netdev_bonding_info_change(dev, info);
1262 static void bond_netdev_notify_work(struct work_struct *_work)
1264 struct netdev_notify_work *w =
1265 container_of(_work, struct netdev_notify_work, work.work);
1267 bond_netdev_notify(w->dev, &w->bonding_info);
1272 void bond_queue_slave_event(struct slave *slave)
1274 struct bonding *bond = slave->bond;
1275 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1280 dev_hold(slave->dev);
1281 nnw->dev = slave->dev;
1282 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1283 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1284 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1286 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1289 /* enslave device <slave> to bond device <master> */
1290 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1292 struct bonding *bond = netdev_priv(bond_dev);
1293 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1294 struct slave *new_slave = NULL, *prev_slave;
1295 struct sockaddr addr;
1299 if (!bond->params.use_carrier &&
1300 slave_dev->ethtool_ops->get_link == NULL &&
1301 slave_ops->ndo_do_ioctl == NULL) {
1302 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1306 /* already enslaved */
1307 if (slave_dev->flags & IFF_SLAVE) {
1308 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1312 if (bond_dev == slave_dev) {
1313 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1317 /* vlan challenged mutual exclusion */
1318 /* no need to lock since we're protected by rtnl_lock */
1319 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1320 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1322 if (vlan_uses_dev(bond_dev)) {
1323 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1324 slave_dev->name, bond_dev->name);
1327 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1328 slave_dev->name, slave_dev->name,
1332 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1336 /* Old ifenslave binaries are no longer supported. These can
1337 * be identified with moderate accuracy by the state of the slave:
1338 * the current ifenslave will set the interface down prior to
1339 * enslaving it; the old ifenslave will not.
1341 if ((slave_dev->flags & IFF_UP)) {
1342 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1345 goto err_undo_flags;
1348 /* set bonding device ether type by slave - bonding netdevices are
1349 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1350 * there is a need to override some of the type dependent attribs/funcs.
1352 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1353 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1355 if (!bond_has_slaves(bond)) {
1356 if (bond_dev->type != slave_dev->type) {
1357 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1358 bond_dev->type, slave_dev->type);
1360 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1362 res = notifier_to_errno(res);
1364 netdev_err(bond_dev, "refused to change device type\n");
1366 goto err_undo_flags;
1369 /* Flush unicast and multicast addresses */
1370 dev_uc_flush(bond_dev);
1371 dev_mc_flush(bond_dev);
1373 if (slave_dev->type != ARPHRD_ETHER)
1374 bond_setup_by_slave(bond_dev, slave_dev);
1376 ether_setup(bond_dev);
1377 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1380 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1383 } else if (bond_dev->type != slave_dev->type) {
1384 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1385 slave_dev->name, slave_dev->type, bond_dev->type);
1387 goto err_undo_flags;
1390 if (slave_ops->ndo_set_mac_address == NULL) {
1391 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1392 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1393 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1394 if (!bond_has_slaves(bond)) {
1395 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1396 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1398 netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1400 goto err_undo_flags;
1405 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1407 /* If this is the first slave, then we need to set the master's hardware
1408 * address to be the same as the slave's.
1410 if (!bond_has_slaves(bond) &&
1411 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1412 bond_set_dev_addr(bond->dev, slave_dev);
1414 new_slave = bond_alloc_slave(bond);
1417 goto err_undo_flags;
1420 new_slave->bond = bond;
1421 new_slave->dev = slave_dev;
1422 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1423 * is set via sysfs or module option if desired.
1425 new_slave->queue_id = 0;
1427 /* Save slave's original mtu and then set it to match the bond */
1428 new_slave->original_mtu = slave_dev->mtu;
1429 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1431 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1435 /* Save slave's original ("permanent") mac address for modes
1436 * that need it, and for restoring it upon release, and then
1437 * set it to the master's address
1439 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1441 if (!bond->params.fail_over_mac ||
1442 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1443 /* Set slave to master's mac address. The application already
1444 * set the master's mac address to that of the first slave
1446 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1447 addr.sa_family = slave_dev->type;
1448 res = dev_set_mac_address(slave_dev, &addr);
1450 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1451 goto err_restore_mtu;
1455 /* open the slave since the application closed it */
1456 res = dev_open(slave_dev);
1458 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1459 goto err_restore_mac;
1462 slave_dev->priv_flags |= IFF_BONDING;
1463 /* initialize slave stats */
1464 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1466 if (bond_is_lb(bond)) {
1467 /* bond_alb_init_slave() must be called before all other stages since
1468 * it might fail and we do not want to have to undo everything
1470 res = bond_alb_init_slave(bond, new_slave);
1475 /* If the mode uses primary, then the following is handled by
1476 * bond_change_active_slave().
1478 if (!bond_uses_primary(bond)) {
1479 /* set promiscuity level to new slave */
1480 if (bond_dev->flags & IFF_PROMISC) {
1481 res = dev_set_promiscuity(slave_dev, 1);
1486 /* set allmulti level to new slave */
1487 if (bond_dev->flags & IFF_ALLMULTI) {
1488 res = dev_set_allmulti(slave_dev, 1);
1493 netif_addr_lock_bh(bond_dev);
1495 dev_mc_sync_multiple(slave_dev, bond_dev);
1496 dev_uc_sync_multiple(slave_dev, bond_dev);
1498 netif_addr_unlock_bh(bond_dev);
1501 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1502 /* add lacpdu mc addr to mc list */
1503 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1505 dev_mc_add(slave_dev, lacpdu_multicast);
1508 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1510 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1515 prev_slave = bond_last_slave(bond);
1517 new_slave->delay = 0;
1518 new_slave->link_failure_count = 0;
1520 bond_update_speed_duplex(new_slave);
1522 new_slave->last_rx = jiffies -
1523 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1524 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1525 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1527 if (bond->params.miimon && !bond->params.use_carrier) {
1528 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1530 if ((link_reporting == -1) && !bond->params.arp_interval) {
1531 /* miimon is set but a bonded network driver
1532 * does not support ETHTOOL/MII and
1533 * arp_interval is not set. Note: if
1534 * use_carrier is enabled, we will never go
1535 * here (because netif_carrier is always
1536 * supported); thus, we don't need to change
1537 * the messages for netif_carrier.
1539 netdev_warn(bond_dev, "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",
1541 } else if (link_reporting == -1) {
1542 /* unable get link status using mii/ethtool */
1543 netdev_warn(bond_dev, "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",
1548 /* check for initial state */
1549 if (bond->params.miimon) {
1550 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1551 if (bond->params.updelay) {
1552 bond_set_slave_link_state(new_slave,
1554 new_slave->delay = bond->params.updelay;
1556 bond_set_slave_link_state(new_slave,
1560 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
1562 } else if (bond->params.arp_interval) {
1563 bond_set_slave_link_state(new_slave,
1564 (netif_carrier_ok(slave_dev) ?
1565 BOND_LINK_UP : BOND_LINK_DOWN));
1567 bond_set_slave_link_state(new_slave, BOND_LINK_UP);
1570 if (new_slave->link != BOND_LINK_DOWN)
1571 new_slave->last_link_up = jiffies;
1572 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1573 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1574 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1576 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1577 /* if there is a primary slave, remember it */
1578 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1579 rcu_assign_pointer(bond->primary_slave, new_slave);
1580 bond->force_primary = true;
1584 switch (BOND_MODE(bond)) {
1585 case BOND_MODE_ACTIVEBACKUP:
1586 bond_set_slave_inactive_flags(new_slave,
1587 BOND_SLAVE_NOTIFY_NOW);
1589 case BOND_MODE_8023AD:
1590 /* in 802.3ad mode, the internal mechanism
1591 * will activate the slaves in the selected
1594 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1595 /* if this is the first slave */
1597 SLAVE_AD_INFO(new_slave)->id = 1;
1598 /* Initialize AD with the number of times that the AD timer is called in 1 second
1599 * can be called only after the mac address of the bond is set
1601 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1603 SLAVE_AD_INFO(new_slave)->id =
1604 SLAVE_AD_INFO(prev_slave)->id + 1;
1607 bond_3ad_bind_slave(new_slave);
1611 bond_set_active_slave(new_slave);
1612 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1615 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1617 /* always active in trunk mode */
1618 bond_set_active_slave(new_slave);
1620 /* In trunking mode there is little meaning to curr_active_slave
1621 * anyway (it holds no special properties of the bond device),
1622 * so we can change it without calling change_active_interface()
1624 if (!rcu_access_pointer(bond->curr_active_slave) &&
1625 new_slave->link == BOND_LINK_UP)
1626 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1629 } /* switch(bond_mode) */
1631 #ifdef CONFIG_NET_POLL_CONTROLLER
1632 slave_dev->npinfo = bond->dev->npinfo;
1633 if (slave_dev->npinfo) {
1634 if (slave_enable_netpoll(new_slave)) {
1635 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1642 if (!(bond_dev->features & NETIF_F_LRO))
1643 dev_disable_lro(slave_dev);
1645 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1648 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1652 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1654 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1655 goto err_unregister;
1658 res = bond_sysfs_slave_add(new_slave);
1660 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1661 goto err_upper_unlink;
1665 bond_compute_features(bond);
1666 bond_set_carrier(bond);
1668 if (bond_uses_primary(bond)) {
1670 bond_select_active_slave(bond);
1671 unblock_netpoll_tx();
1674 if (bond_mode_uses_xmit_hash(bond))
1675 bond_update_slave_arr(bond, NULL);
1677 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1679 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1680 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1682 /* enslave is successful */
1683 bond_queue_slave_event(new_slave);
1686 /* Undo stages on error */
1688 bond_upper_dev_unlink(bond_dev, slave_dev);
1691 netdev_rx_handler_unregister(slave_dev);
1694 if (!bond_uses_primary(bond))
1695 bond_hw_addr_flush(bond_dev, slave_dev);
1697 vlan_vids_del_by_dev(slave_dev, bond_dev);
1698 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1699 RCU_INIT_POINTER(bond->primary_slave, NULL);
1700 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1702 bond_change_active_slave(bond, NULL);
1703 bond_select_active_slave(bond);
1704 unblock_netpoll_tx();
1706 /* either primary_slave or curr_active_slave might've changed */
1708 slave_disable_netpoll(new_slave);
1711 slave_dev->priv_flags &= ~IFF_BONDING;
1712 dev_close(slave_dev);
1715 if (!bond->params.fail_over_mac ||
1716 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1717 /* XXX TODO - fom follow mode needs to change master's
1718 * MAC if this slave's MAC is in use by the bond, or at
1719 * least print a warning.
1721 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1722 addr.sa_family = slave_dev->type;
1723 dev_set_mac_address(slave_dev, &addr);
1727 dev_set_mtu(slave_dev, new_slave->original_mtu);
1730 bond_free_slave(new_slave);
1733 /* Enslave of first slave has failed and we need to fix master's mac */
1734 if (!bond_has_slaves(bond) &&
1735 ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1736 eth_hw_addr_random(bond_dev);
1741 /* Try to release the slave device <slave> from the bond device <master>
1742 * It is legal to access curr_active_slave without a lock because all the function
1743 * is RTNL-locked. If "all" is true it means that the function is being called
1744 * while destroying a bond interface and all slaves are being released.
1746 * The rules for slave state should be:
1747 * for Active/Backup:
1748 * Active stays on all backups go down
1749 * for Bonded connections:
1750 * The first up interface should be left on and all others downed.
1752 static int __bond_release_one(struct net_device *bond_dev,
1753 struct net_device *slave_dev,
1756 struct bonding *bond = netdev_priv(bond_dev);
1757 struct slave *slave, *oldcurrent;
1758 struct sockaddr addr;
1759 int old_flags = bond_dev->flags;
1760 netdev_features_t old_features = bond_dev->features;
1762 /* slave is not a slave or master is not master of this slave */
1763 if (!(slave_dev->flags & IFF_SLAVE) ||
1764 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1765 netdev_dbg(bond_dev, "cannot release %s\n",
1772 slave = bond_get_slave_by_dev(bond, slave_dev);
1774 /* not a slave of this bond */
1775 netdev_info(bond_dev, "%s not enslaved\n",
1777 unblock_netpoll_tx();
1781 bond_sysfs_slave_del(slave);
1783 /* recompute stats just before removing the slave */
1784 bond_get_stats(bond->dev, &bond->bond_stats);
1786 bond_upper_dev_unlink(bond_dev, slave_dev);
1787 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1788 * for this slave anymore.
1790 netdev_rx_handler_unregister(slave_dev);
1792 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1793 bond_3ad_unbind_slave(slave);
1795 if (bond_mode_uses_xmit_hash(bond))
1796 bond_update_slave_arr(bond, slave);
1798 netdev_info(bond_dev, "Releasing %s interface %s\n",
1799 bond_is_active_slave(slave) ? "active" : "backup",
1802 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1804 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1806 if (!all && (!bond->params.fail_over_mac ||
1807 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1808 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1809 bond_has_slaves(bond))
1810 netdev_warn(bond_dev, "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",
1811 slave_dev->name, slave->perm_hwaddr,
1812 bond_dev->name, slave_dev->name);
1815 if (rtnl_dereference(bond->primary_slave) == slave)
1816 RCU_INIT_POINTER(bond->primary_slave, NULL);
1818 if (oldcurrent == slave)
1819 bond_change_active_slave(bond, NULL);
1821 if (bond_is_lb(bond)) {
1822 /* Must be called only after the slave has been
1823 * detached from the list and the curr_active_slave
1824 * has been cleared (if our_slave == old_current),
1825 * but before a new active slave is selected.
1827 bond_alb_deinit_slave(bond, slave);
1831 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1832 } else if (oldcurrent == slave) {
1833 /* Note that we hold RTNL over this sequence, so there
1834 * is no concern that another slave add/remove event
1837 bond_select_active_slave(bond);
1840 if (!bond_has_slaves(bond)) {
1841 bond_set_carrier(bond);
1842 eth_hw_addr_random(bond_dev);
1845 unblock_netpoll_tx();
1849 if (!bond_has_slaves(bond)) {
1850 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1851 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1854 bond_compute_features(bond);
1855 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1856 (old_features & NETIF_F_VLAN_CHALLENGED))
1857 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1858 slave_dev->name, bond_dev->name);
1860 vlan_vids_del_by_dev(slave_dev, bond_dev);
1862 /* If the mode uses primary, then this case was handled above by
1863 * bond_change_active_slave(..., NULL)
1865 if (!bond_uses_primary(bond)) {
1866 /* unset promiscuity level from slave
1867 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1868 * of the IFF_PROMISC flag in the bond_dev, but we need the
1869 * value of that flag before that change, as that was the value
1870 * when this slave was attached, so we cache at the start of the
1871 * function and use it here. Same goes for ALLMULTI below
1873 if (old_flags & IFF_PROMISC)
1874 dev_set_promiscuity(slave_dev, -1);
1876 /* unset allmulti level from slave */
1877 if (old_flags & IFF_ALLMULTI)
1878 dev_set_allmulti(slave_dev, -1);
1880 bond_hw_addr_flush(bond_dev, slave_dev);
1883 slave_disable_netpoll(slave);
1885 /* close slave before restoring its mac address */
1886 dev_close(slave_dev);
1888 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1889 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1890 /* restore original ("permanent") mac address */
1891 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1892 addr.sa_family = slave_dev->type;
1893 dev_set_mac_address(slave_dev, &addr);
1896 dev_set_mtu(slave_dev, slave->original_mtu);
1898 slave_dev->priv_flags &= ~IFF_BONDING;
1900 bond_free_slave(slave);
1905 /* A wrapper used because of ndo_del_link */
1906 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1908 return __bond_release_one(bond_dev, slave_dev, false);
1911 /* First release a slave and then destroy the bond if no more slaves are left.
1912 * Must be under rtnl_lock when this function is called.
1914 static int bond_release_and_destroy(struct net_device *bond_dev,
1915 struct net_device *slave_dev)
1917 struct bonding *bond = netdev_priv(bond_dev);
1920 ret = bond_release(bond_dev, slave_dev);
1921 if (ret == 0 && !bond_has_slaves(bond)) {
1922 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1923 netdev_info(bond_dev, "Destroying bond %s\n",
1925 bond_remove_proc_entry(bond);
1926 unregister_netdevice(bond_dev);
1931 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1933 struct bonding *bond = netdev_priv(bond_dev);
1934 bond_fill_ifbond(bond, info);
1938 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1940 struct bonding *bond = netdev_priv(bond_dev);
1941 struct list_head *iter;
1942 int i = 0, res = -ENODEV;
1943 struct slave *slave;
1945 bond_for_each_slave(bond, slave, iter) {
1946 if (i++ == (int)info->slave_id) {
1948 bond_fill_ifslave(slave, info);
1956 /*-------------------------------- Monitoring -------------------------------*/
1958 /* called with rcu_read_lock() */
1959 static int bond_miimon_inspect(struct bonding *bond)
1961 int link_state, commit = 0;
1962 struct list_head *iter;
1963 struct slave *slave;
1964 bool ignore_updelay;
1966 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1968 bond_for_each_slave_rcu(bond, slave, iter) {
1969 slave->new_link = BOND_LINK_NOCHANGE;
1971 link_state = bond_check_dev_link(bond, slave->dev, 0);
1973 switch (slave->link) {
1978 bond_set_slave_link_state(slave, BOND_LINK_FAIL);
1979 slave->delay = bond->params.downdelay;
1981 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1983 BOND_MODE_ACTIVEBACKUP) ?
1984 (bond_is_active_slave(slave) ?
1985 "active " : "backup ") : "",
1987 bond->params.downdelay * bond->params.miimon);
1990 case BOND_LINK_FAIL:
1992 /* recovered before downdelay expired */
1993 bond_set_slave_link_state(slave, BOND_LINK_UP);
1994 slave->last_link_up = jiffies;
1995 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1996 (bond->params.downdelay - slave->delay) *
1997 bond->params.miimon,
2002 if (slave->delay <= 0) {
2003 slave->new_link = BOND_LINK_DOWN;
2011 case BOND_LINK_DOWN:
2015 bond_set_slave_link_state(slave, BOND_LINK_BACK);
2016 slave->delay = bond->params.updelay;
2019 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2021 ignore_updelay ? 0 :
2022 bond->params.updelay *
2023 bond->params.miimon);
2026 case BOND_LINK_BACK:
2028 bond_set_slave_link_state(slave,
2030 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2031 (bond->params.updelay - slave->delay) *
2032 bond->params.miimon,
2041 if (slave->delay <= 0) {
2042 slave->new_link = BOND_LINK_UP;
2044 ignore_updelay = false;
2056 static void bond_miimon_commit(struct bonding *bond)
2058 struct list_head *iter;
2059 struct slave *slave, *primary;
2061 bond_for_each_slave(bond, slave, iter) {
2062 switch (slave->new_link) {
2063 case BOND_LINK_NOCHANGE:
2067 bond_set_slave_link_state(slave, BOND_LINK_UP);
2068 slave->last_link_up = jiffies;
2070 primary = rtnl_dereference(bond->primary_slave);
2071 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2072 /* prevent it from being the active one */
2073 bond_set_backup_slave(slave);
2074 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2075 /* make it immediately active */
2076 bond_set_active_slave(slave);
2077 } else if (slave != primary) {
2078 /* prevent it from being the active one */
2079 bond_set_backup_slave(slave);
2082 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2084 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2085 slave->duplex ? "full" : "half");
2087 /* notify ad that the link status has changed */
2088 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2089 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2091 if (bond_is_lb(bond))
2092 bond_alb_handle_link_change(bond, slave,
2095 if (BOND_MODE(bond) == BOND_MODE_XOR)
2096 bond_update_slave_arr(bond, NULL);
2098 if (!bond->curr_active_slave || slave == primary)
2103 case BOND_LINK_DOWN:
2104 if (slave->link_failure_count < UINT_MAX)
2105 slave->link_failure_count++;
2107 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2109 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2110 BOND_MODE(bond) == BOND_MODE_8023AD)
2111 bond_set_slave_inactive_flags(slave,
2112 BOND_SLAVE_NOTIFY_NOW);
2114 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2117 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2118 bond_3ad_handle_link_change(slave,
2121 if (bond_is_lb(bond))
2122 bond_alb_handle_link_change(bond, slave,
2125 if (BOND_MODE(bond) == BOND_MODE_XOR)
2126 bond_update_slave_arr(bond, NULL);
2128 if (slave == rcu_access_pointer(bond->curr_active_slave))
2134 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2135 slave->new_link, slave->dev->name);
2136 slave->new_link = BOND_LINK_NOCHANGE;
2143 bond_select_active_slave(bond);
2144 unblock_netpoll_tx();
2147 bond_set_carrier(bond);
2152 * Really a wrapper that splits the mii monitor into two phases: an
2153 * inspection, then (if inspection indicates something needs to be done)
2154 * an acquisition of appropriate locks followed by a commit phase to
2155 * implement whatever link state changes are indicated.
2157 static void bond_mii_monitor(struct work_struct *work)
2159 struct bonding *bond = container_of(work, struct bonding,
2161 bool should_notify_peers = false;
2162 unsigned long delay;
2164 delay = msecs_to_jiffies(bond->params.miimon);
2166 if (!bond_has_slaves(bond))
2171 should_notify_peers = bond_should_notify_peers(bond);
2173 if (bond_miimon_inspect(bond)) {
2176 /* Race avoidance with bond_close cancel of workqueue */
2177 if (!rtnl_trylock()) {
2179 should_notify_peers = false;
2183 bond_miimon_commit(bond);
2185 rtnl_unlock(); /* might sleep, hold no other locks */
2190 if (bond->params.miimon)
2191 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2193 if (should_notify_peers) {
2194 if (!rtnl_trylock())
2196 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2201 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2203 struct net_device *upper;
2204 struct list_head *iter;
2207 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2211 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2212 if (ip == bond_confirm_addr(upper, 0, ip)) {
2222 /* We go to the (large) trouble of VLAN tagging ARP frames because
2223 * switches in VLAN mode (especially if ports are configured as
2224 * "native" to a VLAN) might not pass non-tagged frames.
2226 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2227 __be32 dest_ip, __be32 src_ip,
2228 struct bond_vlan_tag *tags)
2230 struct sk_buff *skb;
2231 struct bond_vlan_tag *outer_tag = tags;
2233 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2234 arp_op, slave_dev->name, &dest_ip, &src_ip);
2236 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2237 NULL, slave_dev->dev_addr, NULL);
2240 net_err_ratelimited("ARP packet allocation failed\n");
2244 if (!tags || tags->vlan_proto == VLAN_N_VID)
2249 /* Go through all the tags backwards and add them to the packet */
2250 while (tags->vlan_proto != VLAN_N_VID) {
2251 if (!tags->vlan_id) {
2256 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2257 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2258 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2261 net_err_ratelimited("failed to insert inner VLAN tag\n");
2267 /* Set the outer tag */
2268 if (outer_tag->vlan_id) {
2269 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2270 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2271 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2272 outer_tag->vlan_id);
2279 /* Validate the device path between the @start_dev and the @end_dev.
2280 * The path is valid if the @end_dev is reachable through device
2282 * When the path is validated, collect any vlan information in the
2285 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2286 struct net_device *end_dev,
2289 struct bond_vlan_tag *tags;
2290 struct net_device *upper;
2291 struct list_head *iter;
2293 if (start_dev == end_dev) {
2294 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2296 return ERR_PTR(-ENOMEM);
2297 tags[level].vlan_proto = VLAN_N_VID;
2301 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2302 tags = bond_verify_device_path(upper, end_dev, level + 1);
2303 if (IS_ERR_OR_NULL(tags)) {
2308 if (is_vlan_dev(upper)) {
2309 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2310 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2319 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2322 struct bond_vlan_tag *tags;
2323 __be32 *targets = bond->params.arp_targets, addr;
2326 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2327 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2330 /* Find out through which dev should the packet go */
2331 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2334 /* there's no route to target - try to send arp
2335 * probe to generate any traffic (arp_validate=0)
2337 if (bond->params.arp_validate)
2338 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2341 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2346 /* bond device itself */
2347 if (rt->dst.dev == bond->dev)
2351 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2354 if (!IS_ERR_OR_NULL(tags))
2357 /* Not our device - skip */
2358 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2359 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2365 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2367 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2373 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2377 if (!sip || !bond_has_this_ip(bond, tip)) {
2378 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2383 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2385 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2389 slave->last_rx = jiffies;
2390 slave->target_last_arp_rx[i] = jiffies;
2393 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2394 struct slave *slave)
2396 struct arphdr *arp = (struct arphdr *)skb->data;
2397 struct slave *curr_active_slave;
2398 unsigned char *arp_ptr;
2400 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2402 if (!slave_do_arp_validate(bond, slave)) {
2403 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2404 !slave_do_arp_validate_only(bond))
2405 slave->last_rx = jiffies;
2406 return RX_HANDLER_ANOTHER;
2407 } else if (!is_arp) {
2408 return RX_HANDLER_ANOTHER;
2411 alen = arp_hdr_len(bond->dev);
2413 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2416 if (alen > skb_headlen(skb)) {
2417 arp = kmalloc(alen, GFP_ATOMIC);
2420 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2424 if (arp->ar_hln != bond->dev->addr_len ||
2425 skb->pkt_type == PACKET_OTHERHOST ||
2426 skb->pkt_type == PACKET_LOOPBACK ||
2427 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2428 arp->ar_pro != htons(ETH_P_IP) ||
2432 arp_ptr = (unsigned char *)(arp + 1);
2433 arp_ptr += bond->dev->addr_len;
2434 memcpy(&sip, arp_ptr, 4);
2435 arp_ptr += 4 + bond->dev->addr_len;
2436 memcpy(&tip, arp_ptr, 4);
2438 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2439 slave->dev->name, bond_slave_state(slave),
2440 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2443 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2445 /* Backup slaves won't see the ARP reply, but do come through
2446 * here for each ARP probe (so we swap the sip/tip to validate
2447 * the probe). In a "redundant switch, common router" type of
2448 * configuration, the ARP probe will (hopefully) travel from
2449 * the active, through one switch, the router, then the other
2450 * switch before reaching the backup.
2452 * We 'trust' the arp requests if there is an active slave and
2453 * it received valid arp reply(s) after it became active. This
2454 * is done to avoid endless looping when we can't reach the
2455 * arp_ip_target and fool ourselves with our own arp requests.
2458 if (bond_is_active_slave(slave))
2459 bond_validate_arp(bond, slave, sip, tip);
2460 else if (curr_active_slave &&
2461 time_after(slave_last_rx(bond, curr_active_slave),
2462 curr_active_slave->last_link_up))
2463 bond_validate_arp(bond, slave, tip, sip);
2466 if (arp != (struct arphdr *)skb->data)
2468 return RX_HANDLER_ANOTHER;
2471 /* function to verify if we're in the arp_interval timeslice, returns true if
2472 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2473 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2475 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2478 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2480 return time_in_range(jiffies,
2481 last_act - delta_in_ticks,
2482 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2485 /* This function is called regularly to monitor each slave's link
2486 * ensuring that traffic is being sent and received when arp monitoring
2487 * is used in load-balancing mode. if the adapter has been dormant, then an
2488 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2489 * arp monitoring in active backup mode.
2491 static void bond_loadbalance_arp_mon(struct work_struct *work)
2493 struct bonding *bond = container_of(work, struct bonding,
2495 struct slave *slave, *oldcurrent;
2496 struct list_head *iter;
2497 int do_failover = 0, slave_state_changed = 0;
2499 if (!bond_has_slaves(bond))
2504 oldcurrent = rcu_dereference(bond->curr_active_slave);
2505 /* see if any of the previous devices are up now (i.e. they have
2506 * xmt and rcv traffic). the curr_active_slave does not come into
2507 * the picture unless it is null. also, slave->last_link_up is not
2508 * needed here because we send an arp on each slave and give a slave
2509 * as long as it needs to get the tx/rx within the delta.
2510 * TODO: what about up/down delay in arp mode? it wasn't here before
2513 bond_for_each_slave_rcu(bond, slave, iter) {
2514 unsigned long trans_start = dev_trans_start(slave->dev);
2516 if (slave->link != BOND_LINK_UP) {
2517 if (bond_time_in_interval(bond, trans_start, 1) &&
2518 bond_time_in_interval(bond, slave->last_rx, 1)) {
2520 slave->link = BOND_LINK_UP;
2521 slave_state_changed = 1;
2523 /* primary_slave has no meaning in round-robin
2524 * mode. the window of a slave being up and
2525 * curr_active_slave being null after enslaving
2529 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2533 netdev_info(bond->dev, "interface %s is now up\n",
2538 /* slave->link == BOND_LINK_UP */
2540 /* not all switches will respond to an arp request
2541 * when the source ip is 0, so don't take the link down
2542 * if we don't know our ip yet
2544 if (!bond_time_in_interval(bond, trans_start, 2) ||
2545 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2547 slave->link = BOND_LINK_DOWN;
2548 slave_state_changed = 1;
2550 if (slave->link_failure_count < UINT_MAX)
2551 slave->link_failure_count++;
2553 netdev_info(bond->dev, "interface %s is now down\n",
2556 if (slave == oldcurrent)
2561 /* note: if switch is in round-robin mode, all links
2562 * must tx arp to ensure all links rx an arp - otherwise
2563 * links may oscillate or not come up at all; if switch is
2564 * in something like xor mode, there is nothing we can
2565 * do - all replies will be rx'ed on same link causing slaves
2566 * to be unstable during low/no traffic periods
2568 if (bond_slave_is_up(slave))
2569 bond_arp_send_all(bond, slave);
2574 if (do_failover || slave_state_changed) {
2575 if (!rtnl_trylock())
2578 if (slave_state_changed) {
2579 bond_slave_state_change(bond);
2580 if (BOND_MODE(bond) == BOND_MODE_XOR)
2581 bond_update_slave_arr(bond, NULL);
2585 bond_select_active_slave(bond);
2586 unblock_netpoll_tx();
2592 if (bond->params.arp_interval)
2593 queue_delayed_work(bond->wq, &bond->arp_work,
2594 msecs_to_jiffies(bond->params.arp_interval));
2597 /* Called to inspect slaves for active-backup mode ARP monitor link state
2598 * changes. Sets new_link in slaves to specify what action should take
2599 * place for the slave. Returns 0 if no changes are found, >0 if changes
2600 * to link states must be committed.
2602 * Called with rcu_read_lock held.
2604 static int bond_ab_arp_inspect(struct bonding *bond)
2606 unsigned long trans_start, last_rx;
2607 struct list_head *iter;
2608 struct slave *slave;
2611 bond_for_each_slave_rcu(bond, slave, iter) {
2612 slave->new_link = BOND_LINK_NOCHANGE;
2613 last_rx = slave_last_rx(bond, slave);
2615 if (slave->link != BOND_LINK_UP) {
2616 if (bond_time_in_interval(bond, last_rx, 1)) {
2617 slave->new_link = BOND_LINK_UP;
2623 /* Give slaves 2*delta after being enslaved or made
2624 * active. This avoids bouncing, as the last receive
2625 * times need a full ARP monitor cycle to be updated.
2627 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2630 /* Backup slave is down if:
2631 * - No current_arp_slave AND
2632 * - more than 3*delta since last receive AND
2633 * - the bond has an IP address
2635 * Note: a non-null current_arp_slave indicates
2636 * the curr_active_slave went down and we are
2637 * searching for a new one; under this condition
2638 * we only take the curr_active_slave down - this
2639 * gives each slave a chance to tx/rx traffic
2640 * before being taken out
2642 if (!bond_is_active_slave(slave) &&
2643 !rcu_access_pointer(bond->current_arp_slave) &&
2644 !bond_time_in_interval(bond, last_rx, 3)) {
2645 slave->new_link = BOND_LINK_DOWN;
2649 /* Active slave is down if:
2650 * - more than 2*delta since transmitting OR
2651 * - (more than 2*delta since receive AND
2652 * the bond has an IP address)
2654 trans_start = dev_trans_start(slave->dev);
2655 if (bond_is_active_slave(slave) &&
2656 (!bond_time_in_interval(bond, trans_start, 2) ||
2657 !bond_time_in_interval(bond, last_rx, 2))) {
2658 slave->new_link = BOND_LINK_DOWN;
2666 /* Called to commit link state changes noted by inspection step of
2667 * active-backup mode ARP monitor.
2669 * Called with RTNL hold.
2671 static void bond_ab_arp_commit(struct bonding *bond)
2673 unsigned long trans_start;
2674 struct list_head *iter;
2675 struct slave *slave;
2677 bond_for_each_slave(bond, slave, iter) {
2678 switch (slave->new_link) {
2679 case BOND_LINK_NOCHANGE:
2683 trans_start = dev_trans_start(slave->dev);
2684 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2685 (!rtnl_dereference(bond->curr_active_slave) &&
2686 bond_time_in_interval(bond, trans_start, 1))) {
2687 struct slave *current_arp_slave;
2689 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2690 bond_set_slave_link_state(slave, BOND_LINK_UP);
2691 if (current_arp_slave) {
2692 bond_set_slave_inactive_flags(
2694 BOND_SLAVE_NOTIFY_NOW);
2695 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2698 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2701 if (!rtnl_dereference(bond->curr_active_slave) ||
2702 slave == rtnl_dereference(bond->primary_slave))
2709 case BOND_LINK_DOWN:
2710 if (slave->link_failure_count < UINT_MAX)
2711 slave->link_failure_count++;
2713 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2714 bond_set_slave_inactive_flags(slave,
2715 BOND_SLAVE_NOTIFY_NOW);
2717 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2720 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2721 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2728 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2729 slave->new_link, slave->dev->name);
2735 bond_select_active_slave(bond);
2736 unblock_netpoll_tx();
2739 bond_set_carrier(bond);
2742 /* Send ARP probes for active-backup mode ARP monitor.
2744 * Called with rcu_read_lock held.
2746 static bool bond_ab_arp_probe(struct bonding *bond)
2748 struct slave *slave, *before = NULL, *new_slave = NULL,
2749 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2750 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2751 struct list_head *iter;
2753 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2755 if (curr_arp_slave && curr_active_slave)
2756 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2757 curr_arp_slave->dev->name,
2758 curr_active_slave->dev->name);
2760 if (curr_active_slave) {
2761 bond_arp_send_all(bond, curr_active_slave);
2762 return should_notify_rtnl;
2765 /* if we don't have a curr_active_slave, search for the next available
2766 * backup slave from the current_arp_slave and make it the candidate
2767 * for becoming the curr_active_slave
2770 if (!curr_arp_slave) {
2771 curr_arp_slave = bond_first_slave_rcu(bond);
2772 if (!curr_arp_slave)
2773 return should_notify_rtnl;
2776 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2778 bond_for_each_slave_rcu(bond, slave, iter) {
2779 if (!found && !before && bond_slave_is_up(slave))
2782 if (found && !new_slave && bond_slave_is_up(slave))
2784 /* if the link state is up at this point, we
2785 * mark it down - this can happen if we have
2786 * simultaneous link failures and
2787 * reselect_active_interface doesn't make this
2788 * one the current slave so it is still marked
2789 * up when it is actually down
2791 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2792 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2793 if (slave->link_failure_count < UINT_MAX)
2794 slave->link_failure_count++;
2796 bond_set_slave_inactive_flags(slave,
2797 BOND_SLAVE_NOTIFY_LATER);
2799 netdev_info(bond->dev, "backup interface %s is now down\n",
2802 if (slave == curr_arp_slave)
2806 if (!new_slave && before)
2812 bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
2813 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2814 bond_arp_send_all(bond, new_slave);
2815 new_slave->last_link_up = jiffies;
2816 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2819 bond_for_each_slave_rcu(bond, slave, iter) {
2820 if (slave->should_notify) {
2821 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2825 return should_notify_rtnl;
2828 static void bond_activebackup_arp_mon(struct work_struct *work)
2830 struct bonding *bond = container_of(work, struct bonding,
2832 bool should_notify_peers = false;
2833 bool should_notify_rtnl = false;
2836 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2838 if (!bond_has_slaves(bond))
2843 should_notify_peers = bond_should_notify_peers(bond);
2845 if (bond_ab_arp_inspect(bond)) {
2848 /* Race avoidance with bond_close flush of workqueue */
2849 if (!rtnl_trylock()) {
2851 should_notify_peers = false;
2855 bond_ab_arp_commit(bond);
2861 should_notify_rtnl = bond_ab_arp_probe(bond);
2865 if (bond->params.arp_interval)
2866 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2868 if (should_notify_peers || should_notify_rtnl) {
2869 if (!rtnl_trylock())
2872 if (should_notify_peers)
2873 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2875 if (should_notify_rtnl)
2876 bond_slave_state_notify(bond);
2882 /*-------------------------- netdev event handling --------------------------*/
2884 /* Change device name */
2885 static int bond_event_changename(struct bonding *bond)
2887 bond_remove_proc_entry(bond);
2888 bond_create_proc_entry(bond);
2890 bond_debug_reregister(bond);
2895 static int bond_master_netdev_event(unsigned long event,
2896 struct net_device *bond_dev)
2898 struct bonding *event_bond = netdev_priv(bond_dev);
2901 case NETDEV_CHANGENAME:
2902 return bond_event_changename(event_bond);
2903 case NETDEV_UNREGISTER:
2904 bond_remove_proc_entry(event_bond);
2906 case NETDEV_REGISTER:
2907 bond_create_proc_entry(event_bond);
2909 case NETDEV_NOTIFY_PEERS:
2910 if (event_bond->send_peer_notif)
2911 event_bond->send_peer_notif--;
2920 static int bond_slave_netdev_event(unsigned long event,
2921 struct net_device *slave_dev)
2923 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2924 struct bonding *bond;
2925 struct net_device *bond_dev;
2929 /* A netdev event can be generated while enslaving a device
2930 * before netdev_rx_handler_register is called in which case
2931 * slave will be NULL
2935 bond_dev = slave->bond->dev;
2937 primary = rtnl_dereference(bond->primary_slave);
2940 case NETDEV_UNREGISTER:
2941 if (bond_dev->type != ARPHRD_ETHER)
2942 bond_release_and_destroy(bond_dev, slave_dev);
2944 bond_release(bond_dev, slave_dev);
2948 old_speed = slave->speed;
2949 old_duplex = slave->duplex;
2951 bond_update_speed_duplex(slave);
2953 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2954 if (old_speed != slave->speed)
2955 bond_3ad_adapter_speed_changed(slave);
2956 if (old_duplex != slave->duplex)
2957 bond_3ad_adapter_duplex_changed(slave);
2961 /* Refresh slave-array if applicable!
2962 * If the setup does not use miimon or arpmon (mode-specific!),
2963 * then these events will not cause the slave-array to be
2964 * refreshed. This will cause xmit to use a slave that is not
2965 * usable. Avoid such situation by refeshing the array at these
2966 * events. If these (miimon/arpmon) parameters are configured
2967 * then array gets refreshed twice and that should be fine!
2969 if (bond_mode_uses_xmit_hash(bond))
2970 bond_update_slave_arr(bond, NULL);
2972 case NETDEV_CHANGEMTU:
2973 /* TODO: Should slaves be allowed to
2974 * independently alter their MTU? For
2975 * an active-backup bond, slaves need
2976 * not be the same type of device, so
2977 * MTUs may vary. For other modes,
2978 * slaves arguably should have the
2979 * same MTUs. To do this, we'd need to
2980 * take over the slave's change_mtu
2981 * function for the duration of their
2985 case NETDEV_CHANGENAME:
2986 /* we don't care if we don't have primary set */
2987 if (!bond_uses_primary(bond) ||
2988 !bond->params.primary[0])
2991 if (slave == primary) {
2992 /* slave's name changed - he's no longer primary */
2993 RCU_INIT_POINTER(bond->primary_slave, NULL);
2994 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2995 /* we have a new primary slave */
2996 rcu_assign_pointer(bond->primary_slave, slave);
2997 } else { /* we didn't change primary - exit */
3001 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3002 primary ? slave_dev->name : "none");
3005 bond_select_active_slave(bond);
3006 unblock_netpoll_tx();
3008 case NETDEV_FEAT_CHANGE:
3009 bond_compute_features(bond);
3011 case NETDEV_RESEND_IGMP:
3012 /* Propagate to master device */
3013 call_netdevice_notifiers(event, slave->bond->dev);
3022 /* bond_netdev_event: handle netdev notifier chain events.
3024 * This function receives events for the netdev chain. The caller (an
3025 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3026 * locks for us to safely manipulate the slave devices (RTNL lock,
3029 static int bond_netdev_event(struct notifier_block *this,
3030 unsigned long event, void *ptr)
3032 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3034 netdev_dbg(event_dev, "event: %lx\n", event);
3036 if (!(event_dev->priv_flags & IFF_BONDING))
3039 if (event_dev->flags & IFF_MASTER) {
3040 netdev_dbg(event_dev, "IFF_MASTER\n");
3041 return bond_master_netdev_event(event, event_dev);
3044 if (event_dev->flags & IFF_SLAVE) {
3045 netdev_dbg(event_dev, "IFF_SLAVE\n");
3046 return bond_slave_netdev_event(event, event_dev);
3052 static struct notifier_block bond_netdev_notifier = {
3053 .notifier_call = bond_netdev_event,
3056 /*---------------------------- Hashing Policies -----------------------------*/
3058 /* L2 hash helper */
3059 static inline u32 bond_eth_hash(struct sk_buff *skb)
3061 struct ethhdr *ep, hdr_tmp;
3063 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3065 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3069 /* Extract the appropriate headers based on bond's xmit policy */
3070 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3071 struct flow_keys *fk)
3073 const struct ipv6hdr *iph6;
3074 const struct iphdr *iph;
3075 int noff, proto = -1;
3077 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3078 return skb_flow_dissect(skb, fk);
3081 noff = skb_network_offset(skb);
3082 if (skb->protocol == htons(ETH_P_IP)) {
3083 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3086 fk->src = iph->saddr;
3087 fk->dst = iph->daddr;
3088 noff += iph->ihl << 2;
3089 if (!ip_is_fragment(iph))
3090 proto = iph->protocol;
3091 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3092 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3094 iph6 = ipv6_hdr(skb);
3095 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
3096 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
3097 noff += sizeof(*iph6);
3098 proto = iph6->nexthdr;
3102 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3103 fk->ports = skb_flow_get_ports(skb, noff, proto);
3109 * bond_xmit_hash - generate a hash value based on the xmit policy
3110 * @bond: bonding device
3111 * @skb: buffer to use for headers
3113 * This function will extract the necessary headers from the skb buffer and use
3114 * them to generate a hash based on the xmit_policy set in the bonding device
3116 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3118 struct flow_keys flow;
3121 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3122 !bond_flow_dissect(bond, skb, &flow))
3123 return bond_eth_hash(skb);
3125 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3126 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3127 hash = bond_eth_hash(skb);
3129 hash = (__force u32)flow.ports;
3130 hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3131 hash ^= (hash >> 16);
3132 hash ^= (hash >> 8);
3137 /*-------------------------- Device entry points ----------------------------*/
3139 static void bond_work_init_all(struct bonding *bond)
3141 INIT_DELAYED_WORK(&bond->mcast_work,
3142 bond_resend_igmp_join_requests_delayed);
3143 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3144 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3145 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3146 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3148 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3149 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3150 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3153 static void bond_work_cancel_all(struct bonding *bond)
3155 cancel_delayed_work_sync(&bond->mii_work);
3156 cancel_delayed_work_sync(&bond->arp_work);
3157 cancel_delayed_work_sync(&bond->alb_work);
3158 cancel_delayed_work_sync(&bond->ad_work);
3159 cancel_delayed_work_sync(&bond->mcast_work);
3160 cancel_delayed_work_sync(&bond->slave_arr_work);
3163 static int bond_open(struct net_device *bond_dev)
3165 struct bonding *bond = netdev_priv(bond_dev);
3166 struct list_head *iter;
3167 struct slave *slave;
3169 /* reset slave->backup and slave->inactive */
3170 if (bond_has_slaves(bond)) {
3171 bond_for_each_slave(bond, slave, iter) {
3172 if (bond_uses_primary(bond) &&
3173 slave != rcu_access_pointer(bond->curr_active_slave)) {
3174 bond_set_slave_inactive_flags(slave,
3175 BOND_SLAVE_NOTIFY_NOW);
3176 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3177 bond_set_slave_active_flags(slave,
3178 BOND_SLAVE_NOTIFY_NOW);
3183 bond_work_init_all(bond);
3185 if (bond_is_lb(bond)) {
3186 /* bond_alb_initialize must be called before the timer
3189 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3191 if (bond->params.tlb_dynamic_lb)
3192 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3195 if (bond->params.miimon) /* link check interval, in milliseconds. */
3196 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3198 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3199 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3200 bond->recv_probe = bond_arp_rcv;
3203 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3204 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3205 /* register to receive LACPDUs */
3206 bond->recv_probe = bond_3ad_lacpdu_recv;
3207 bond_3ad_initiate_agg_selection(bond, 1);
3210 if (bond_mode_uses_xmit_hash(bond))
3211 bond_update_slave_arr(bond, NULL);
3216 static int bond_close(struct net_device *bond_dev)
3218 struct bonding *bond = netdev_priv(bond_dev);
3220 bond_work_cancel_all(bond);
3221 bond->send_peer_notif = 0;
3222 if (bond_is_lb(bond))
3223 bond_alb_deinitialize(bond);
3224 bond->recv_probe = NULL;
3229 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3230 struct rtnl_link_stats64 *stats)
3232 struct bonding *bond = netdev_priv(bond_dev);
3233 struct rtnl_link_stats64 temp;
3234 struct list_head *iter;
3235 struct slave *slave;
3237 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3239 bond_for_each_slave(bond, slave, iter) {
3240 const struct rtnl_link_stats64 *sstats =
3241 dev_get_stats(slave->dev, &temp);
3242 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3244 stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
3245 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3246 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3247 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3249 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3250 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3251 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3252 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3254 stats->multicast += sstats->multicast - pstats->multicast;
3255 stats->collisions += sstats->collisions - pstats->collisions;
3257 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3258 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3259 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3260 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3261 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3262 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3264 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3265 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3266 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3267 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3268 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3270 /* save off the slave stats for the next run */
3271 memcpy(pstats, sstats, sizeof(*sstats));
3273 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3278 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3280 struct bonding *bond = netdev_priv(bond_dev);
3281 struct net_device *slave_dev = NULL;
3282 struct ifbond k_binfo;
3283 struct ifbond __user *u_binfo = NULL;
3284 struct ifslave k_sinfo;
3285 struct ifslave __user *u_sinfo = NULL;
3286 struct mii_ioctl_data *mii = NULL;
3287 struct bond_opt_value newval;
3291 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3302 /* We do this again just in case we were called by SIOCGMIIREG
3303 * instead of SIOCGMIIPHY.
3309 if (mii->reg_num == 1) {
3311 if (netif_carrier_ok(bond->dev))
3312 mii->val_out = BMSR_LSTATUS;
3316 case BOND_INFO_QUERY_OLD:
3317 case SIOCBONDINFOQUERY:
3318 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3320 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3323 res = bond_info_query(bond_dev, &k_binfo);
3325 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3329 case BOND_SLAVE_INFO_QUERY_OLD:
3330 case SIOCBONDSLAVEINFOQUERY:
3331 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3333 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3336 res = bond_slave_info_query(bond_dev, &k_sinfo);
3338 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3346 net = dev_net(bond_dev);
3348 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3351 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3353 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3358 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3360 case BOND_ENSLAVE_OLD:
3361 case SIOCBONDENSLAVE:
3362 res = bond_enslave(bond_dev, slave_dev);
3364 case BOND_RELEASE_OLD:
3365 case SIOCBONDRELEASE:
3366 res = bond_release(bond_dev, slave_dev);
3368 case BOND_SETHWADDR_OLD:
3369 case SIOCBONDSETHWADDR:
3370 bond_set_dev_addr(bond_dev, slave_dev);
3373 case BOND_CHANGE_ACTIVE_OLD:
3374 case SIOCBONDCHANGEACTIVE:
3375 bond_opt_initstr(&newval, slave_dev->name);
3376 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3385 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3387 struct bonding *bond = netdev_priv(bond_dev);
3389 if (change & IFF_PROMISC)
3390 bond_set_promiscuity(bond,
3391 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3393 if (change & IFF_ALLMULTI)
3394 bond_set_allmulti(bond,
3395 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3398 static void bond_set_rx_mode(struct net_device *bond_dev)
3400 struct bonding *bond = netdev_priv(bond_dev);
3401 struct list_head *iter;
3402 struct slave *slave;
3405 if (bond_uses_primary(bond)) {
3406 slave = rcu_dereference(bond->curr_active_slave);
3408 dev_uc_sync(slave->dev, bond_dev);
3409 dev_mc_sync(slave->dev, bond_dev);
3412 bond_for_each_slave_rcu(bond, slave, iter) {
3413 dev_uc_sync_multiple(slave->dev, bond_dev);
3414 dev_mc_sync_multiple(slave->dev, bond_dev);
3420 static int bond_neigh_init(struct neighbour *n)
3422 struct bonding *bond = netdev_priv(n->dev);
3423 const struct net_device_ops *slave_ops;
3424 struct neigh_parms parms;
3425 struct slave *slave;
3428 slave = bond_first_slave(bond);
3431 slave_ops = slave->dev->netdev_ops;
3432 if (!slave_ops->ndo_neigh_setup)
3435 parms.neigh_setup = NULL;
3436 parms.neigh_cleanup = NULL;
3437 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3441 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3442 * after the last slave has been detached. Assumes that all slaves
3443 * utilize the same neigh_cleanup (true at this writing as only user
3446 n->parms->neigh_cleanup = parms.neigh_cleanup;
3448 if (!parms.neigh_setup)
3451 return parms.neigh_setup(n);
3454 /* The bonding ndo_neigh_setup is called at init time beofre any
3455 * slave exists. So we must declare proxy setup function which will
3456 * be used at run time to resolve the actual slave neigh param setup.
3458 * It's also called by master devices (such as vlans) to setup their
3459 * underlying devices. In that case - do nothing, we're already set up from
3462 static int bond_neigh_setup(struct net_device *dev,
3463 struct neigh_parms *parms)
3465 /* modify only our neigh_parms */
3466 if (parms->dev == dev)
3467 parms->neigh_setup = bond_neigh_init;
3472 /* Change the MTU of all of a master's slaves to match the master */
3473 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3475 struct bonding *bond = netdev_priv(bond_dev);
3476 struct slave *slave, *rollback_slave;
3477 struct list_head *iter;
3480 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3482 bond_for_each_slave(bond, slave, iter) {
3483 netdev_dbg(bond_dev, "s %p c_m %p\n",
3484 slave, slave->dev->netdev_ops->ndo_change_mtu);
3486 res = dev_set_mtu(slave->dev, new_mtu);
3489 /* If we failed to set the slave's mtu to the new value
3490 * we must abort the operation even in ACTIVE_BACKUP
3491 * mode, because if we allow the backup slaves to have
3492 * different mtu values than the active slave we'll
3493 * need to change their mtu when doing a failover. That
3494 * means changing their mtu from timer context, which
3495 * is probably not a good idea.
3497 netdev_dbg(bond_dev, "err %d %s\n", res,
3503 bond_dev->mtu = new_mtu;
3508 /* unwind from head to the slave that failed */
3509 bond_for_each_slave(bond, rollback_slave, iter) {
3512 if (rollback_slave == slave)
3515 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3517 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3518 tmp_res, rollback_slave->dev->name);
3525 /* Change HW address
3527 * Note that many devices must be down to change the HW address, and
3528 * downing the master releases all slaves. We can make bonds full of
3529 * bonding devices to test this, however.
3531 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3533 struct bonding *bond = netdev_priv(bond_dev);
3534 struct slave *slave, *rollback_slave;
3535 struct sockaddr *sa = addr, tmp_sa;
3536 struct list_head *iter;
3539 if (BOND_MODE(bond) == BOND_MODE_ALB)
3540 return bond_alb_set_mac_address(bond_dev, addr);
3543 netdev_dbg(bond_dev, "bond=%p\n", bond);
3545 /* If fail_over_mac is enabled, do nothing and return success.
3546 * Returning an error causes ifenslave to fail.
3548 if (bond->params.fail_over_mac &&
3549 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3552 if (!is_valid_ether_addr(sa->sa_data))
3553 return -EADDRNOTAVAIL;
3555 bond_for_each_slave(bond, slave, iter) {
3556 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3557 res = dev_set_mac_address(slave->dev, addr);
3559 /* TODO: consider downing the slave
3561 * User should expect communications
3562 * breakage anyway until ARP finish
3565 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3571 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3575 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3576 tmp_sa.sa_family = bond_dev->type;
3578 /* unwind from head to the slave that failed */
3579 bond_for_each_slave(bond, rollback_slave, iter) {
3582 if (rollback_slave == slave)
3585 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3587 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3588 tmp_res, rollback_slave->dev->name);
3596 * bond_xmit_slave_id - transmit skb through slave with slave_id
3597 * @bond: bonding device that is transmitting
3598 * @skb: buffer to transmit
3599 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3601 * This function tries to transmit through slave with slave_id but in case
3602 * it fails, it tries to find the first available slave for transmission.
3603 * The skb is consumed in all cases, thus the function is void.
3605 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3607 struct list_head *iter;
3608 struct slave *slave;
3611 /* Here we start from the slave with slave_id */
3612 bond_for_each_slave_rcu(bond, slave, iter) {
3614 if (bond_slave_can_tx(slave)) {
3615 bond_dev_queue_xmit(bond, skb, slave->dev);
3621 /* Here we start from the first slave up to slave_id */
3623 bond_for_each_slave_rcu(bond, slave, iter) {
3626 if (bond_slave_can_tx(slave)) {
3627 bond_dev_queue_xmit(bond, skb, slave->dev);
3631 /* no slave that can tx has been found */
3632 bond_tx_drop(bond->dev, skb);
3636 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3637 * @bond: bonding device to use
3639 * Based on the value of the bonding device's packets_per_slave parameter
3640 * this function generates a slave id, which is usually used as the next
3641 * slave to transmit through.
3643 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3646 struct reciprocal_value reciprocal_packets_per_slave;
3647 int packets_per_slave = bond->params.packets_per_slave;
3649 switch (packets_per_slave) {
3651 slave_id = prandom_u32();
3654 slave_id = bond->rr_tx_counter;
3657 reciprocal_packets_per_slave =
3658 bond->params.reciprocal_packets_per_slave;
3659 slave_id = reciprocal_divide(bond->rr_tx_counter,
3660 reciprocal_packets_per_slave);
3663 bond->rr_tx_counter++;
3668 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3670 struct bonding *bond = netdev_priv(bond_dev);
3671 struct iphdr *iph = ip_hdr(skb);
3672 struct slave *slave;
3675 /* Start with the curr_active_slave that joined the bond as the
3676 * default for sending IGMP traffic. For failover purposes one
3677 * needs to maintain some consistency for the interface that will
3678 * send the join/membership reports. The curr_active_slave found
3679 * will send all of this type of traffic.
3681 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3682 slave = rcu_dereference(bond->curr_active_slave);
3684 bond_dev_queue_xmit(bond, skb, slave->dev);
3686 bond_xmit_slave_id(bond, skb, 0);
3688 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3690 if (likely(slave_cnt)) {
3691 slave_id = bond_rr_gen_slave_id(bond);
3692 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3694 bond_tx_drop(bond_dev, skb);
3698 return NETDEV_TX_OK;
3701 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3702 * the bond has a usable interface.
3704 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3706 struct bonding *bond = netdev_priv(bond_dev);
3707 struct slave *slave;
3709 slave = rcu_dereference(bond->curr_active_slave);
3711 bond_dev_queue_xmit(bond, skb, slave->dev);
3713 bond_tx_drop(bond_dev, skb);
3715 return NETDEV_TX_OK;
3718 /* Use this to update slave_array when (a) it's not appropriate to update
3719 * slave_array right away (note that update_slave_array() may sleep)
3720 * and / or (b) RTNL is not held.
3722 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3724 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3727 /* Slave array work handler. Holds only RTNL */
3728 static void bond_slave_arr_handler(struct work_struct *work)
3730 struct bonding *bond = container_of(work, struct bonding,
3731 slave_arr_work.work);
3734 if (!rtnl_trylock())
3737 ret = bond_update_slave_arr(bond, NULL);
3740 pr_warn_ratelimited("Failed to update slave array from WT\n");
3746 bond_slave_arr_work_rearm(bond, 1);
3749 /* Build the usable slaves array in control path for modes that use xmit-hash
3750 * to determine the slave interface -
3751 * (a) BOND_MODE_8023AD
3753 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3755 * The caller is expected to hold RTNL only and NO other lock!
3757 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3759 struct slave *slave;
3760 struct list_head *iter;
3761 struct bond_up_slave *new_arr, *old_arr;
3766 #ifdef CONFIG_LOCKDEP
3767 WARN_ON(lockdep_is_held(&bond->mode_lock));
3770 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3774 pr_err("Failed to build slave-array.\n");
3777 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3778 struct ad_info ad_info;
3780 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3781 pr_debug("bond_3ad_get_active_agg_info failed\n");
3782 kfree_rcu(new_arr, rcu);
3783 /* No active aggragator means it's not safe to use
3784 * the previous array.
3786 old_arr = rtnl_dereference(bond->slave_arr);
3788 RCU_INIT_POINTER(bond->slave_arr, NULL);
3789 kfree_rcu(old_arr, rcu);
3793 slaves_in_agg = ad_info.ports;
3794 agg_id = ad_info.aggregator_id;
3796 bond_for_each_slave(bond, slave, iter) {
3797 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3798 struct aggregator *agg;
3800 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3801 if (!agg || agg->aggregator_identifier != agg_id)
3804 if (!bond_slave_can_tx(slave))
3806 if (skipslave == slave)
3808 new_arr->arr[new_arr->count++] = slave;
3811 old_arr = rtnl_dereference(bond->slave_arr);
3812 rcu_assign_pointer(bond->slave_arr, new_arr);
3814 kfree_rcu(old_arr, rcu);
3816 if (ret != 0 && skipslave) {
3819 /* Rare situation where caller has asked to skip a specific
3820 * slave but allocation failed (most likely!). BTW this is
3821 * only possible when the call is initiated from
3822 * __bond_release_one(). In this situation; overwrite the
3823 * skipslave entry in the array with the last entry from the
3824 * array to avoid a situation where the xmit path may choose
3825 * this to-be-skipped slave to send a packet out.
3827 old_arr = rtnl_dereference(bond->slave_arr);
3828 for (idx = 0; idx < old_arr->count; idx++) {
3829 if (skipslave == old_arr->arr[idx]) {
3831 old_arr->arr[old_arr->count-1];
3840 /* Use this Xmit function for 3AD as well as XOR modes. The current
3841 * usable slave array is formed in the control path. The xmit function
3842 * just calculates hash and sends the packet out.
3844 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3846 struct bonding *bond = netdev_priv(dev);
3847 struct slave *slave;
3848 struct bond_up_slave *slaves;
3851 slaves = rcu_dereference(bond->slave_arr);
3852 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3853 if (likely(count)) {
3854 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3855 bond_dev_queue_xmit(bond, skb, slave->dev);
3857 bond_tx_drop(dev, skb);
3860 return NETDEV_TX_OK;
3863 /* in broadcast mode, we send everything to all usable interfaces. */
3864 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3866 struct bonding *bond = netdev_priv(bond_dev);
3867 struct slave *slave = NULL;
3868 struct list_head *iter;
3870 bond_for_each_slave_rcu(bond, slave, iter) {
3871 if (bond_is_last_slave(bond, slave))
3873 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3874 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3877 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3878 bond_dev->name, __func__);
3881 bond_dev_queue_xmit(bond, skb2, slave->dev);
3884 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3885 bond_dev_queue_xmit(bond, skb, slave->dev);
3887 bond_tx_drop(bond_dev, skb);
3889 return NETDEV_TX_OK;
3892 /*------------------------- Device initialization ---------------------------*/
3894 /* Lookup the slave that corresponds to a qid */
3895 static inline int bond_slave_override(struct bonding *bond,
3896 struct sk_buff *skb)
3898 struct slave *slave = NULL;
3899 struct list_head *iter;
3901 if (!skb->queue_mapping)
3904 /* Find out if any slaves have the same mapping as this skb. */
3905 bond_for_each_slave_rcu(bond, slave, iter) {
3906 if (slave->queue_id == skb->queue_mapping) {
3907 if (bond_slave_is_up(slave) &&
3908 slave->link == BOND_LINK_UP) {
3909 bond_dev_queue_xmit(bond, skb, slave->dev);
3912 /* If the slave isn't UP, use default transmit policy. */
3921 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3922 void *accel_priv, select_queue_fallback_t fallback)
3924 /* This helper function exists to help dev_pick_tx get the correct
3925 * destination queue. Using a helper function skips a call to
3926 * skb_tx_hash and will put the skbs in the queue we expect on their
3927 * way down to the bonding driver.
3929 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3931 /* Save the original txq to restore before passing to the driver */
3932 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3934 if (unlikely(txq >= dev->real_num_tx_queues)) {
3936 txq -= dev->real_num_tx_queues;
3937 } while (txq >= dev->real_num_tx_queues);
3942 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3944 struct bonding *bond = netdev_priv(dev);
3946 if (bond_should_override_tx_queue(bond) &&
3947 !bond_slave_override(bond, skb))
3948 return NETDEV_TX_OK;
3950 switch (BOND_MODE(bond)) {
3951 case BOND_MODE_ROUNDROBIN:
3952 return bond_xmit_roundrobin(skb, dev);
3953 case BOND_MODE_ACTIVEBACKUP:
3954 return bond_xmit_activebackup(skb, dev);
3955 case BOND_MODE_8023AD:
3957 return bond_3ad_xor_xmit(skb, dev);
3958 case BOND_MODE_BROADCAST:
3959 return bond_xmit_broadcast(skb, dev);
3961 return bond_alb_xmit(skb, dev);
3963 return bond_tlb_xmit(skb, dev);
3965 /* Should never happen, mode already checked */
3966 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3968 bond_tx_drop(dev, skb);
3969 return NETDEV_TX_OK;
3973 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3975 struct bonding *bond = netdev_priv(dev);
3976 netdev_tx_t ret = NETDEV_TX_OK;
3978 /* If we risk deadlock from transmitting this in the
3979 * netpoll path, tell netpoll to queue the frame for later tx
3981 if (unlikely(is_netpoll_tx_blocked(dev)))
3982 return NETDEV_TX_BUSY;
3985 if (bond_has_slaves(bond))
3986 ret = __bond_start_xmit(skb, dev);
3988 bond_tx_drop(dev, skb);
3994 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3995 struct ethtool_cmd *ecmd)
3997 struct bonding *bond = netdev_priv(bond_dev);
3998 unsigned long speed = 0;
3999 struct list_head *iter;
4000 struct slave *slave;
4002 ecmd->duplex = DUPLEX_UNKNOWN;
4003 ecmd->port = PORT_OTHER;
4005 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4006 * do not need to check mode. Though link speed might not represent
4007 * the true receive or transmit bandwidth (not all modes are symmetric)
4008 * this is an accurate maximum.
4010 bond_for_each_slave(bond, slave, iter) {
4011 if (bond_slave_can_tx(slave)) {
4012 if (slave->speed != SPEED_UNKNOWN)
4013 speed += slave->speed;
4014 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4015 slave->duplex != DUPLEX_UNKNOWN)
4016 ecmd->duplex = slave->duplex;
4019 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4024 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4025 struct ethtool_drvinfo *drvinfo)
4027 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4028 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4029 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4033 static const struct ethtool_ops bond_ethtool_ops = {
4034 .get_drvinfo = bond_ethtool_get_drvinfo,
4035 .get_settings = bond_ethtool_get_settings,
4036 .get_link = ethtool_op_get_link,
4039 static const struct net_device_ops bond_netdev_ops = {
4040 .ndo_init = bond_init,
4041 .ndo_uninit = bond_uninit,
4042 .ndo_open = bond_open,
4043 .ndo_stop = bond_close,
4044 .ndo_start_xmit = bond_start_xmit,
4045 .ndo_select_queue = bond_select_queue,
4046 .ndo_get_stats64 = bond_get_stats,
4047 .ndo_do_ioctl = bond_do_ioctl,
4048 .ndo_change_rx_flags = bond_change_rx_flags,
4049 .ndo_set_rx_mode = bond_set_rx_mode,
4050 .ndo_change_mtu = bond_change_mtu,
4051 .ndo_set_mac_address = bond_set_mac_address,
4052 .ndo_neigh_setup = bond_neigh_setup,
4053 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4054 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4055 #ifdef CONFIG_NET_POLL_CONTROLLER
4056 .ndo_netpoll_setup = bond_netpoll_setup,
4057 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4058 .ndo_poll_controller = bond_poll_controller,
4060 .ndo_add_slave = bond_enslave,
4061 .ndo_del_slave = bond_release,
4062 .ndo_fix_features = bond_fix_features,
4063 .ndo_bridge_setlink = ndo_dflt_netdev_switch_port_bridge_setlink,
4064 .ndo_bridge_dellink = ndo_dflt_netdev_switch_port_bridge_dellink,
4065 .ndo_features_check = passthru_features_check,
4068 static const struct device_type bond_type = {
4072 static void bond_destructor(struct net_device *bond_dev)
4074 struct bonding *bond = netdev_priv(bond_dev);
4076 destroy_workqueue(bond->wq);
4077 free_netdev(bond_dev);
4080 void bond_setup(struct net_device *bond_dev)
4082 struct bonding *bond = netdev_priv(bond_dev);
4084 spin_lock_init(&bond->mode_lock);
4085 bond->params = bonding_defaults;
4087 /* Initialize pointers */
4088 bond->dev = bond_dev;
4090 /* Initialize the device entry points */
4091 ether_setup(bond_dev);
4092 bond_dev->netdev_ops = &bond_netdev_ops;
4093 bond_dev->ethtool_ops = &bond_ethtool_ops;
4095 bond_dev->destructor = bond_destructor;
4097 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4099 /* Initialize the device options */
4100 bond_dev->tx_queue_len = 0;
4101 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4102 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
4103 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4105 /* don't acquire bond device's netif_tx_lock when transmitting */
4106 bond_dev->features |= NETIF_F_LLTX;
4108 /* By default, we declare the bond to be fully
4109 * VLAN hardware accelerated capable. Special
4110 * care is taken in the various xmit functions
4111 * when there are slaves that are not hw accel
4115 /* Don't allow bond devices to change network namespaces. */
4116 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4118 bond_dev->hw_features = BOND_VLAN_FEATURES |
4119 NETIF_F_HW_VLAN_CTAG_TX |
4120 NETIF_F_HW_VLAN_CTAG_RX |
4121 NETIF_F_HW_VLAN_CTAG_FILTER;
4123 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4124 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4125 bond_dev->features |= bond_dev->hw_features;
4128 /* Destroy a bonding device.
4129 * Must be under rtnl_lock when this function is called.
4131 static void bond_uninit(struct net_device *bond_dev)
4133 struct bonding *bond = netdev_priv(bond_dev);
4134 struct list_head *iter;
4135 struct slave *slave;
4136 struct bond_up_slave *arr;
4138 bond_netpoll_cleanup(bond_dev);
4140 /* Release the bonded slaves */
4141 bond_for_each_slave(bond, slave, iter)
4142 __bond_release_one(bond_dev, slave->dev, true);
4143 netdev_info(bond_dev, "Released all slaves\n");
4145 arr = rtnl_dereference(bond->slave_arr);
4147 RCU_INIT_POINTER(bond->slave_arr, NULL);
4148 kfree_rcu(arr, rcu);
4151 list_del(&bond->bond_list);
4153 bond_debug_unregister(bond);
4156 /*------------------------- Module initialization ---------------------------*/
4158 static int bond_check_params(struct bond_params *params)
4160 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4161 struct bond_opt_value newval;
4162 const struct bond_opt_value *valptr;
4163 int arp_all_targets_value;
4165 /* Convert string parameters. */
4167 bond_opt_initstr(&newval, mode);
4168 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4170 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4173 bond_mode = valptr->value;
4176 if (xmit_hash_policy) {
4177 if ((bond_mode != BOND_MODE_XOR) &&
4178 (bond_mode != BOND_MODE_8023AD) &&
4179 (bond_mode != BOND_MODE_TLB)) {
4180 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4181 bond_mode_name(bond_mode));
4183 bond_opt_initstr(&newval, xmit_hash_policy);
4184 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4187 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4191 xmit_hashtype = valptr->value;
4196 if (bond_mode != BOND_MODE_8023AD) {
4197 pr_info("lacp_rate param is irrelevant in mode %s\n",
4198 bond_mode_name(bond_mode));
4200 bond_opt_initstr(&newval, lacp_rate);
4201 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4204 pr_err("Error: Invalid lacp rate \"%s\"\n",
4208 lacp_fast = valptr->value;
4213 bond_opt_initstr(&newval, ad_select);
4214 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4217 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4220 params->ad_select = valptr->value;
4221 if (bond_mode != BOND_MODE_8023AD)
4222 pr_warn("ad_select param only affects 802.3ad mode\n");
4224 params->ad_select = BOND_AD_STABLE;
4227 if (max_bonds < 0) {
4228 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4229 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4230 max_bonds = BOND_DEFAULT_MAX_BONDS;
4234 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4240 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4245 if (downdelay < 0) {
4246 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4247 downdelay, INT_MAX);
4251 if ((use_carrier != 0) && (use_carrier != 1)) {
4252 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4257 if (num_peer_notif < 0 || num_peer_notif > 255) {
4258 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4263 /* reset values for 802.3ad/TLB/ALB */
4264 if (!bond_mode_uses_arp(bond_mode)) {
4266 pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4267 pr_warn("Forcing miimon to 100msec\n");
4268 miimon = BOND_DEFAULT_MIIMON;
4272 if (tx_queues < 1 || tx_queues > 255) {
4273 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4274 tx_queues, BOND_DEFAULT_TX_QUEUES);
4275 tx_queues = BOND_DEFAULT_TX_QUEUES;
4278 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4279 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4281 all_slaves_active = 0;
4284 if (resend_igmp < 0 || resend_igmp > 255) {
4285 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4286 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4287 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4290 bond_opt_initval(&newval, packets_per_slave);
4291 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4292 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4293 packets_per_slave, USHRT_MAX);
4294 packets_per_slave = 1;
4297 if (bond_mode == BOND_MODE_ALB) {
4298 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",
4303 if (updelay || downdelay) {
4304 /* just warn the user the up/down delay will have
4305 * no effect since miimon is zero...
4307 pr_warn("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",
4308 updelay, downdelay);
4311 /* don't allow arp monitoring */
4313 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4314 miimon, arp_interval);
4318 if ((updelay % miimon) != 0) {
4319 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4320 updelay, miimon, (updelay / miimon) * miimon);
4325 if ((downdelay % miimon) != 0) {
4326 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4328 (downdelay / miimon) * miimon);
4331 downdelay /= miimon;
4334 if (arp_interval < 0) {
4335 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4336 arp_interval, INT_MAX);
4340 for (arp_ip_count = 0, i = 0;
4341 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4344 /* not a complete check, but good enough to catch mistakes */
4345 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4346 !bond_is_ip_target_ok(ip)) {
4347 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4351 if (bond_get_targets_ip(arp_target, ip) == -1)
4352 arp_target[arp_ip_count++] = ip;
4354 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4359 if (arp_interval && !arp_ip_count) {
4360 /* don't allow arping if no arp_ip_target given... */
4361 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4367 if (!arp_interval) {
4368 pr_err("arp_validate requires arp_interval\n");
4372 bond_opt_initstr(&newval, arp_validate);
4373 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4376 pr_err("Error: invalid arp_validate \"%s\"\n",
4380 arp_validate_value = valptr->value;
4382 arp_validate_value = 0;
4385 arp_all_targets_value = 0;
4386 if (arp_all_targets) {
4387 bond_opt_initstr(&newval, arp_all_targets);
4388 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4391 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4393 arp_all_targets_value = 0;
4395 arp_all_targets_value = valptr->value;
4400 pr_info("MII link monitoring set to %d ms\n", miimon);
4401 } else if (arp_interval) {
4402 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4403 arp_validate_value);
4404 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4405 arp_interval, valptr->string, arp_ip_count);
4407 for (i = 0; i < arp_ip_count; i++)
4408 pr_cont(" %s", arp_ip_target[i]);
4412 } else if (max_bonds) {
4413 /* miimon and arp_interval not set, we need one so things
4414 * work as expected, see bonding.txt for details
4416 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");
4419 if (primary && !bond_mode_uses_primary(bond_mode)) {
4420 /* currently, using a primary only makes sense
4421 * in active backup, TLB or ALB modes
4423 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4424 primary, bond_mode_name(bond_mode));
4428 if (primary && primary_reselect) {
4429 bond_opt_initstr(&newval, primary_reselect);
4430 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4433 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4437 primary_reselect_value = valptr->value;
4439 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4442 if (fail_over_mac) {
4443 bond_opt_initstr(&newval, fail_over_mac);
4444 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4447 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4451 fail_over_mac_value = valptr->value;
4452 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4453 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4455 fail_over_mac_value = BOND_FOM_NONE;
4458 if (lp_interval == 0) {
4459 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4460 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4461 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4464 /* fill params struct with the proper values */
4465 params->mode = bond_mode;
4466 params->xmit_policy = xmit_hashtype;
4467 params->miimon = miimon;
4468 params->num_peer_notif = num_peer_notif;
4469 params->arp_interval = arp_interval;
4470 params->arp_validate = arp_validate_value;
4471 params->arp_all_targets = arp_all_targets_value;
4472 params->updelay = updelay;
4473 params->downdelay = downdelay;
4474 params->use_carrier = use_carrier;
4475 params->lacp_fast = lacp_fast;
4476 params->primary[0] = 0;
4477 params->primary_reselect = primary_reselect_value;
4478 params->fail_over_mac = fail_over_mac_value;
4479 params->tx_queues = tx_queues;
4480 params->all_slaves_active = all_slaves_active;
4481 params->resend_igmp = resend_igmp;
4482 params->min_links = min_links;
4483 params->lp_interval = lp_interval;
4484 params->packets_per_slave = packets_per_slave;
4485 params->tlb_dynamic_lb = 1; /* Default value */
4486 if (packets_per_slave > 0) {
4487 params->reciprocal_packets_per_slave =
4488 reciprocal_value(packets_per_slave);
4490 /* reciprocal_packets_per_slave is unused if
4491 * packets_per_slave is 0 or 1, just initialize it
4493 params->reciprocal_packets_per_slave =
4494 (struct reciprocal_value) { 0 };
4498 strncpy(params->primary, primary, IFNAMSIZ);
4499 params->primary[IFNAMSIZ - 1] = 0;
4502 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4507 static struct lock_class_key bonding_netdev_xmit_lock_key;
4508 static struct lock_class_key bonding_netdev_addr_lock_key;
4509 static struct lock_class_key bonding_tx_busylock_key;
4511 static void bond_set_lockdep_class_one(struct net_device *dev,
4512 struct netdev_queue *txq,
4515 lockdep_set_class(&txq->_xmit_lock,
4516 &bonding_netdev_xmit_lock_key);
4519 static void bond_set_lockdep_class(struct net_device *dev)
4521 lockdep_set_class(&dev->addr_list_lock,
4522 &bonding_netdev_addr_lock_key);
4523 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4524 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4527 /* Called from registration process */
4528 static int bond_init(struct net_device *bond_dev)
4530 struct bonding *bond = netdev_priv(bond_dev);
4531 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4533 netdev_dbg(bond_dev, "Begin bond_init\n");
4535 bond->wq = create_singlethread_workqueue(bond_dev->name);
4539 bond_set_lockdep_class(bond_dev);
4541 list_add_tail(&bond->bond_list, &bn->dev_list);
4543 bond_prepare_sysfs_group(bond);
4545 bond_debug_register(bond);
4547 /* Ensure valid dev_addr */
4548 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4549 bond_dev->addr_assign_type == NET_ADDR_PERM)
4550 eth_hw_addr_random(bond_dev);
4555 unsigned int bond_get_num_tx_queues(void)
4560 /* Create a new bond based on the specified name and bonding parameters.
4561 * If name is NULL, obtain a suitable "bond%d" name for us.
4562 * Caller must NOT hold rtnl_lock; we need to release it here before we
4563 * set up our sysfs entries.
4565 int bond_create(struct net *net, const char *name)
4567 struct net_device *bond_dev;
4568 struct bonding *bond;
4569 struct alb_bond_info *bond_info;
4574 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4575 name ? name : "bond%d", NET_NAME_UNKNOWN,
4576 bond_setup, tx_queues);
4578 pr_err("%s: eek! can't alloc netdev!\n", name);
4584 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4585 * It is set to 0 by default which is wrong.
4587 bond = netdev_priv(bond_dev);
4588 bond_info = &(BOND_ALB_INFO(bond));
4589 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4591 dev_net_set(bond_dev, net);
4592 bond_dev->rtnl_link_ops = &bond_link_ops;
4594 res = register_netdevice(bond_dev);
4596 netif_carrier_off(bond_dev);
4600 bond_destructor(bond_dev);
4604 static int __net_init bond_net_init(struct net *net)
4606 struct bond_net *bn = net_generic(net, bond_net_id);
4609 INIT_LIST_HEAD(&bn->dev_list);
4611 bond_create_proc_dir(bn);
4612 bond_create_sysfs(bn);
4617 static void __net_exit bond_net_exit(struct net *net)
4619 struct bond_net *bn = net_generic(net, bond_net_id);
4620 struct bonding *bond, *tmp_bond;
4623 bond_destroy_sysfs(bn);
4625 /* Kill off any bonds created after unregistering bond rtnl ops */
4627 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4628 unregister_netdevice_queue(bond->dev, &list);
4629 unregister_netdevice_many(&list);
4632 bond_destroy_proc_dir(bn);
4635 static struct pernet_operations bond_net_ops = {
4636 .init = bond_net_init,
4637 .exit = bond_net_exit,
4639 .size = sizeof(struct bond_net),
4642 static int __init bonding_init(void)
4647 pr_info("%s", bond_version);
4649 res = bond_check_params(&bonding_defaults);
4653 res = register_pernet_subsys(&bond_net_ops);
4657 res = bond_netlink_init();
4661 bond_create_debugfs();
4663 for (i = 0; i < max_bonds; i++) {
4664 res = bond_create(&init_net, NULL);
4669 register_netdevice_notifier(&bond_netdev_notifier);
4673 bond_destroy_debugfs();
4674 bond_netlink_fini();
4676 unregister_pernet_subsys(&bond_net_ops);
4681 static void __exit bonding_exit(void)
4683 unregister_netdevice_notifier(&bond_netdev_notifier);
4685 bond_destroy_debugfs();
4687 bond_netlink_fini();
4688 unregister_pernet_subsys(&bond_net_ops);
4690 #ifdef CONFIG_NET_POLL_CONTROLLER
4691 /* Make sure we don't have an imbalance on our netpoll blocking */
4692 WARN_ON(atomic_read(&netpoll_block_tx));
4696 module_init(bonding_init);
4697 module_exit(bonding_exit);
4698 MODULE_LICENSE("GPL");
4699 MODULE_VERSION(DRV_VERSION);
4700 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4701 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");