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_dissector.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->name=%s slave_dev->addr_len=%d\n",
622 bond_dev, slave_dev, slave_dev->name, 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 struct slave *bond_choose_primary_or_current(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 || prim->link != BOND_LINK_UP) {
718 if (!curr || curr->link != BOND_LINK_UP)
723 if (bond->force_primary) {
724 bond->force_primary = false;
728 if (!curr || curr->link != BOND_LINK_UP)
731 /* At this point, prim and curr are both up */
732 switch (bond->params.primary_reselect) {
733 case BOND_PRI_RESELECT_ALWAYS:
735 case BOND_PRI_RESELECT_BETTER:
736 if (prim->speed < curr->speed)
738 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
741 case BOND_PRI_RESELECT_FAILURE:
744 netdev_err(bond->dev, "impossible primary_reselect %d\n",
745 bond->params.primary_reselect);
751 * bond_find_best_slave - select the best available slave to be the active one
752 * @bond: our bonding struct
754 static struct slave *bond_find_best_slave(struct bonding *bond)
756 struct slave *slave, *bestslave = NULL;
757 struct list_head *iter;
758 int mintime = bond->params.updelay;
760 slave = bond_choose_primary_or_current(bond);
764 bond_for_each_slave(bond, slave, iter) {
765 if (slave->link == BOND_LINK_UP)
767 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
768 slave->delay < mintime) {
769 mintime = slave->delay;
777 static bool bond_should_notify_peers(struct bonding *bond)
782 slave = rcu_dereference(bond->curr_active_slave);
785 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
786 slave ? slave->dev->name : "NULL");
788 if (!slave || !bond->send_peer_notif ||
789 !netif_carrier_ok(bond->dev) ||
790 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
797 * change_active_interface - change the active slave into the specified one
798 * @bond: our bonding struct
799 * @new: the new slave to make the active one
801 * Set the new slave to the bond's settings and unset them on the old
803 * Setting include flags, mc-list, promiscuity, allmulti, etc.
805 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
806 * because it is apparently the best available slave we have, even though its
807 * updelay hasn't timed out yet.
809 * Caller must hold RTNL.
811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
813 struct slave *old_active;
817 old_active = rtnl_dereference(bond->curr_active_slave);
819 if (old_active == new_active)
823 new_active->last_link_up = jiffies;
825 if (new_active->link == BOND_LINK_BACK) {
826 if (bond_uses_primary(bond)) {
827 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
828 new_active->dev->name,
829 (bond->params.updelay - new_active->delay) * bond->params.miimon);
832 new_active->delay = 0;
833 bond_set_slave_link_state(new_active, BOND_LINK_UP,
834 BOND_SLAVE_NOTIFY_NOW);
836 if (BOND_MODE(bond) == BOND_MODE_8023AD)
837 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
839 if (bond_is_lb(bond))
840 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
842 if (bond_uses_primary(bond)) {
843 netdev_info(bond->dev, "making interface %s the new active one\n",
844 new_active->dev->name);
849 if (bond_uses_primary(bond))
850 bond_hw_addr_swap(bond, new_active, old_active);
852 if (bond_is_lb(bond)) {
853 bond_alb_handle_active_change(bond, new_active);
855 bond_set_slave_inactive_flags(old_active,
856 BOND_SLAVE_NOTIFY_NOW);
858 bond_set_slave_active_flags(new_active,
859 BOND_SLAVE_NOTIFY_NOW);
861 rcu_assign_pointer(bond->curr_active_slave, new_active);
864 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
866 bond_set_slave_inactive_flags(old_active,
867 BOND_SLAVE_NOTIFY_NOW);
870 bool should_notify_peers = false;
872 bond_set_slave_active_flags(new_active,
873 BOND_SLAVE_NOTIFY_NOW);
875 if (bond->params.fail_over_mac)
876 bond_do_fail_over_mac(bond, new_active,
879 if (netif_running(bond->dev)) {
880 bond->send_peer_notif =
881 bond->params.num_peer_notif;
882 should_notify_peers =
883 bond_should_notify_peers(bond);
886 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
887 if (should_notify_peers)
888 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
893 /* resend IGMP joins since active slave has changed or
894 * all were sent on curr_active_slave.
895 * resend only if bond is brought up with the affected
896 * bonding modes and the retransmission is enabled
898 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
899 ((bond_uses_primary(bond) && new_active) ||
900 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
901 bond->igmp_retrans = bond->params.resend_igmp;
902 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
907 * bond_select_active_slave - select a new active slave, if needed
908 * @bond: our bonding struct
910 * This functions should be called when one of the following occurs:
911 * - The old curr_active_slave has been released or lost its link.
912 * - The primary_slave has got its link back.
913 * - A slave has got its link back and there's no old curr_active_slave.
915 * Caller must hold RTNL.
917 void bond_select_active_slave(struct bonding *bond)
919 struct slave *best_slave;
924 best_slave = bond_find_best_slave(bond);
925 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
926 bond_change_active_slave(bond, best_slave);
927 rv = bond_set_carrier(bond);
931 if (netif_carrier_ok(bond->dev))
932 netdev_info(bond->dev, "first active interface up!\n");
934 netdev_info(bond->dev, "now running without any active interface!\n");
938 #ifdef CONFIG_NET_POLL_CONTROLLER
939 static inline int slave_enable_netpoll(struct slave *slave)
944 np = kzalloc(sizeof(*np), GFP_KERNEL);
949 err = __netpoll_setup(np, slave->dev);
958 static inline void slave_disable_netpoll(struct slave *slave)
960 struct netpoll *np = slave->np;
966 __netpoll_free_async(np);
969 static void bond_poll_controller(struct net_device *bond_dev)
971 struct bonding *bond = netdev_priv(bond_dev);
972 struct slave *slave = NULL;
973 struct list_head *iter;
974 struct ad_info ad_info;
975 struct netpoll_info *ni;
976 const struct net_device_ops *ops;
978 if (BOND_MODE(bond) == BOND_MODE_8023AD)
979 if (bond_3ad_get_active_agg_info(bond, &ad_info))
982 bond_for_each_slave_rcu(bond, slave, iter) {
983 ops = slave->dev->netdev_ops;
984 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
987 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
988 struct aggregator *agg =
989 SLAVE_AD_INFO(slave)->port.aggregator;
992 agg->aggregator_identifier != ad_info.aggregator_id)
996 ni = rcu_dereference_bh(slave->dev->npinfo);
997 if (down_trylock(&ni->dev_lock))
999 ops->ndo_poll_controller(slave->dev);
1004 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1006 struct bonding *bond = netdev_priv(bond_dev);
1007 struct list_head *iter;
1008 struct slave *slave;
1010 bond_for_each_slave(bond, slave, iter)
1011 if (bond_slave_is_up(slave))
1012 slave_disable_netpoll(slave);
1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1017 struct bonding *bond = netdev_priv(dev);
1018 struct list_head *iter;
1019 struct slave *slave;
1022 bond_for_each_slave(bond, slave, iter) {
1023 err = slave_enable_netpoll(slave);
1025 bond_netpoll_cleanup(dev);
1032 static inline int slave_enable_netpoll(struct slave *slave)
1036 static inline void slave_disable_netpoll(struct slave *slave)
1039 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1044 /*---------------------------------- IOCTL ----------------------------------*/
1046 static netdev_features_t bond_fix_features(struct net_device *dev,
1047 netdev_features_t features)
1049 struct bonding *bond = netdev_priv(dev);
1050 struct list_head *iter;
1051 netdev_features_t mask;
1052 struct slave *slave;
1056 features &= ~NETIF_F_ONE_FOR_ALL;
1057 features |= NETIF_F_ALL_FOR_ALL;
1059 bond_for_each_slave(bond, slave, iter) {
1060 features = netdev_increment_features(features,
1061 slave->dev->features,
1064 features = netdev_add_tso_features(features, mask);
1069 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1070 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1071 NETIF_F_HIGHDMA | NETIF_F_LRO)
1073 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1076 static void bond_compute_features(struct bonding *bond)
1078 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1079 IFF_XMIT_DST_RELEASE_PERM;
1080 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1081 netdev_features_t enc_features = BOND_ENC_FEATURES;
1082 struct net_device *bond_dev = bond->dev;
1083 struct list_head *iter;
1084 struct slave *slave;
1085 unsigned short max_hard_header_len = ETH_HLEN;
1086 unsigned int gso_max_size = GSO_MAX_SIZE;
1087 u16 gso_max_segs = GSO_MAX_SEGS;
1089 if (!bond_has_slaves(bond))
1091 vlan_features &= NETIF_F_ALL_FOR_ALL;
1093 bond_for_each_slave(bond, slave, iter) {
1094 vlan_features = netdev_increment_features(vlan_features,
1095 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1097 enc_features = netdev_increment_features(enc_features,
1098 slave->dev->hw_enc_features,
1100 dst_release_flag &= slave->dev->priv_flags;
1101 if (slave->dev->hard_header_len > max_hard_header_len)
1102 max_hard_header_len = slave->dev->hard_header_len;
1104 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1105 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1109 bond_dev->vlan_features = vlan_features;
1110 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1111 bond_dev->hard_header_len = max_hard_header_len;
1112 bond_dev->gso_max_segs = gso_max_segs;
1113 netif_set_gso_max_size(bond_dev, gso_max_size);
1115 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1116 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1117 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1118 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1120 netdev_change_features(bond_dev);
1123 static void bond_setup_by_slave(struct net_device *bond_dev,
1124 struct net_device *slave_dev)
1126 bond_dev->header_ops = slave_dev->header_ops;
1128 bond_dev->type = slave_dev->type;
1129 bond_dev->hard_header_len = slave_dev->hard_header_len;
1130 bond_dev->addr_len = slave_dev->addr_len;
1132 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1133 slave_dev->addr_len);
1136 /* On bonding slaves other than the currently active slave, suppress
1137 * duplicates except for alb non-mcast/bcast.
1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1140 struct slave *slave,
1141 struct bonding *bond)
1143 if (bond_is_slave_inactive(slave)) {
1144 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1145 skb->pkt_type != PACKET_BROADCAST &&
1146 skb->pkt_type != PACKET_MULTICAST)
1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1155 struct sk_buff *skb = *pskb;
1156 struct slave *slave;
1157 struct bonding *bond;
1158 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1160 int ret = RX_HANDLER_ANOTHER;
1162 skb = skb_share_check(skb, GFP_ATOMIC);
1164 return RX_HANDLER_CONSUMED;
1168 slave = bond_slave_get_rcu(skb->dev);
1171 recv_probe = ACCESS_ONCE(bond->recv_probe);
1173 ret = recv_probe(skb, bond, slave);
1174 if (ret == RX_HANDLER_CONSUMED) {
1180 if (bond_should_deliver_exact_match(skb, slave, bond))
1181 return RX_HANDLER_EXACT;
1183 skb->dev = bond->dev;
1185 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1186 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1187 skb->pkt_type == PACKET_HOST) {
1189 if (unlikely(skb_cow_head(skb,
1190 skb->data - skb_mac_header(skb)))) {
1192 return RX_HANDLER_CONSUMED;
1194 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1200 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1202 switch (BOND_MODE(bond)) {
1203 case BOND_MODE_ROUNDROBIN:
1204 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1205 case BOND_MODE_ACTIVEBACKUP:
1206 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1207 case BOND_MODE_BROADCAST:
1208 return NETDEV_LAG_TX_TYPE_BROADCAST;
1210 case BOND_MODE_8023AD:
1211 return NETDEV_LAG_TX_TYPE_HASH;
1213 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1217 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1219 struct netdev_lag_upper_info lag_upper_info;
1222 lag_upper_info.tx_type = bond_lag_tx_type(bond);
1223 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1227 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1233 netdev_upper_dev_unlink(slave->dev, bond->dev);
1234 slave->dev->flags &= ~IFF_SLAVE;
1235 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1238 static struct slave *bond_alloc_slave(struct bonding *bond)
1240 struct slave *slave = NULL;
1242 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1246 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1247 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1249 if (!SLAVE_AD_INFO(slave)) {
1257 static void bond_free_slave(struct slave *slave)
1259 struct bonding *bond = bond_get_bond_by_slave(slave);
1261 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1262 kfree(SLAVE_AD_INFO(slave));
1267 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1269 info->bond_mode = BOND_MODE(bond);
1270 info->miimon = bond->params.miimon;
1271 info->num_slaves = bond->slave_cnt;
1274 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1276 strcpy(info->slave_name, slave->dev->name);
1277 info->link = slave->link;
1278 info->state = bond_slave_state(slave);
1279 info->link_failure_count = slave->link_failure_count;
1282 static void bond_netdev_notify(struct net_device *dev,
1283 struct netdev_bonding_info *info)
1286 netdev_bonding_info_change(dev, info);
1290 static void bond_netdev_notify_work(struct work_struct *_work)
1292 struct netdev_notify_work *w =
1293 container_of(_work, struct netdev_notify_work, work.work);
1295 bond_netdev_notify(w->dev, &w->bonding_info);
1300 void bond_queue_slave_event(struct slave *slave)
1302 struct bonding *bond = slave->bond;
1303 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1308 dev_hold(slave->dev);
1309 nnw->dev = slave->dev;
1310 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1311 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1312 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1314 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1317 void bond_lower_state_changed(struct slave *slave)
1319 struct netdev_lag_lower_state_info info;
1321 info.link_up = slave->link == BOND_LINK_UP ||
1322 slave->link == BOND_LINK_FAIL;
1323 info.tx_enabled = bond_is_active_slave(slave);
1324 netdev_lower_state_changed(slave->dev, &info);
1327 /* enslave device <slave> to bond device <master> */
1328 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1330 struct bonding *bond = netdev_priv(bond_dev);
1331 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1332 struct slave *new_slave = NULL, *prev_slave;
1333 struct sockaddr addr;
1337 if (!bond->params.use_carrier &&
1338 slave_dev->ethtool_ops->get_link == NULL &&
1339 slave_ops->ndo_do_ioctl == NULL) {
1340 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1344 /* already enslaved */
1345 if (slave_dev->flags & IFF_SLAVE) {
1346 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1350 if (bond_dev == slave_dev) {
1351 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1355 /* vlan challenged mutual exclusion */
1356 /* no need to lock since we're protected by rtnl_lock */
1357 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1358 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1360 if (vlan_uses_dev(bond_dev)) {
1361 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1362 slave_dev->name, bond_dev->name);
1365 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1366 slave_dev->name, slave_dev->name,
1370 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1374 /* Old ifenslave binaries are no longer supported. These can
1375 * be identified with moderate accuracy by the state of the slave:
1376 * the current ifenslave will set the interface down prior to
1377 * enslaving it; the old ifenslave will not.
1379 if (slave_dev->flags & IFF_UP) {
1380 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1383 goto err_undo_flags;
1386 /* set bonding device ether type by slave - bonding netdevices are
1387 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1388 * there is a need to override some of the type dependent attribs/funcs.
1390 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1391 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1393 if (!bond_has_slaves(bond)) {
1394 if (bond_dev->type != slave_dev->type) {
1395 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1396 bond_dev->type, slave_dev->type);
1398 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1400 res = notifier_to_errno(res);
1402 netdev_err(bond_dev, "refused to change device type\n");
1404 goto err_undo_flags;
1407 /* Flush unicast and multicast addresses */
1408 dev_uc_flush(bond_dev);
1409 dev_mc_flush(bond_dev);
1411 if (slave_dev->type != ARPHRD_ETHER)
1412 bond_setup_by_slave(bond_dev, slave_dev);
1414 ether_setup(bond_dev);
1415 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1418 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1421 } else if (bond_dev->type != slave_dev->type) {
1422 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1423 slave_dev->name, slave_dev->type, bond_dev->type);
1425 goto err_undo_flags;
1428 if (slave_ops->ndo_set_mac_address == NULL) {
1429 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1430 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1431 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1432 if (!bond_has_slaves(bond)) {
1433 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1434 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1436 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");
1438 goto err_undo_flags;
1443 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1445 /* If this is the first slave, then we need to set the master's hardware
1446 * address to be the same as the slave's.
1448 if (!bond_has_slaves(bond) &&
1449 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1450 bond_set_dev_addr(bond->dev, slave_dev);
1452 new_slave = bond_alloc_slave(bond);
1455 goto err_undo_flags;
1458 new_slave->bond = bond;
1459 new_slave->dev = slave_dev;
1460 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1461 * is set via sysfs or module option if desired.
1463 new_slave->queue_id = 0;
1465 /* Save slave's original mtu and then set it to match the bond */
1466 new_slave->original_mtu = slave_dev->mtu;
1467 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1469 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1473 /* Save slave's original ("permanent") mac address for modes
1474 * that need it, and for restoring it upon release, and then
1475 * set it to the master's address
1477 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1479 if (!bond->params.fail_over_mac ||
1480 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1481 /* Set slave to master's mac address. The application already
1482 * set the master's mac address to that of the first slave
1484 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1485 addr.sa_family = slave_dev->type;
1486 res = dev_set_mac_address(slave_dev, &addr);
1488 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1489 goto err_restore_mtu;
1493 /* set slave flag before open to prevent IPv6 addrconf */
1494 slave_dev->flags |= IFF_SLAVE;
1496 /* open the slave since the application closed it */
1497 res = dev_open(slave_dev);
1499 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1500 goto err_restore_mac;
1503 slave_dev->priv_flags |= IFF_BONDING;
1504 /* initialize slave stats */
1505 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1507 if (bond_is_lb(bond)) {
1508 /* bond_alb_init_slave() must be called before all other stages since
1509 * it might fail and we do not want to have to undo everything
1511 res = bond_alb_init_slave(bond, new_slave);
1516 /* If the mode uses primary, then the following is handled by
1517 * bond_change_active_slave().
1519 if (!bond_uses_primary(bond)) {
1520 /* set promiscuity level to new slave */
1521 if (bond_dev->flags & IFF_PROMISC) {
1522 res = dev_set_promiscuity(slave_dev, 1);
1527 /* set allmulti level to new slave */
1528 if (bond_dev->flags & IFF_ALLMULTI) {
1529 res = dev_set_allmulti(slave_dev, 1);
1534 netif_addr_lock_bh(bond_dev);
1536 dev_mc_sync_multiple(slave_dev, bond_dev);
1537 dev_uc_sync_multiple(slave_dev, bond_dev);
1539 netif_addr_unlock_bh(bond_dev);
1542 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1543 /* add lacpdu mc addr to mc list */
1544 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1546 dev_mc_add(slave_dev, lacpdu_multicast);
1549 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1551 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1556 prev_slave = bond_last_slave(bond);
1558 new_slave->delay = 0;
1559 new_slave->link_failure_count = 0;
1561 bond_update_speed_duplex(new_slave);
1563 new_slave->last_rx = jiffies -
1564 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1565 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1566 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1568 if (bond->params.miimon && !bond->params.use_carrier) {
1569 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1571 if ((link_reporting == -1) && !bond->params.arp_interval) {
1572 /* miimon is set but a bonded network driver
1573 * does not support ETHTOOL/MII and
1574 * arp_interval is not set. Note: if
1575 * use_carrier is enabled, we will never go
1576 * here (because netif_carrier is always
1577 * supported); thus, we don't need to change
1578 * the messages for netif_carrier.
1580 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",
1582 } else if (link_reporting == -1) {
1583 /* unable get link status using mii/ethtool */
1584 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",
1589 /* check for initial state */
1590 if (bond->params.miimon) {
1591 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1592 if (bond->params.updelay) {
1593 bond_set_slave_link_state(new_slave,
1595 BOND_SLAVE_NOTIFY_NOW);
1596 new_slave->delay = bond->params.updelay;
1598 bond_set_slave_link_state(new_slave,
1600 BOND_SLAVE_NOTIFY_NOW);
1603 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1604 BOND_SLAVE_NOTIFY_NOW);
1606 } else if (bond->params.arp_interval) {
1607 bond_set_slave_link_state(new_slave,
1608 (netif_carrier_ok(slave_dev) ?
1609 BOND_LINK_UP : BOND_LINK_DOWN),
1610 BOND_SLAVE_NOTIFY_NOW);
1612 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1613 BOND_SLAVE_NOTIFY_NOW);
1616 if (new_slave->link != BOND_LINK_DOWN)
1617 new_slave->last_link_up = jiffies;
1618 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1619 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1620 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1622 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1623 /* if there is a primary slave, remember it */
1624 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1625 rcu_assign_pointer(bond->primary_slave, new_slave);
1626 bond->force_primary = true;
1630 switch (BOND_MODE(bond)) {
1631 case BOND_MODE_ACTIVEBACKUP:
1632 bond_set_slave_inactive_flags(new_slave,
1633 BOND_SLAVE_NOTIFY_NOW);
1635 case BOND_MODE_8023AD:
1636 /* in 802.3ad mode, the internal mechanism
1637 * will activate the slaves in the selected
1640 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1641 /* if this is the first slave */
1643 SLAVE_AD_INFO(new_slave)->id = 1;
1644 /* Initialize AD with the number of times that the AD timer is called in 1 second
1645 * can be called only after the mac address of the bond is set
1647 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1649 SLAVE_AD_INFO(new_slave)->id =
1650 SLAVE_AD_INFO(prev_slave)->id + 1;
1653 bond_3ad_bind_slave(new_slave);
1657 bond_set_active_slave(new_slave);
1658 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1661 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1663 /* always active in trunk mode */
1664 bond_set_active_slave(new_slave);
1666 /* In trunking mode there is little meaning to curr_active_slave
1667 * anyway (it holds no special properties of the bond device),
1668 * so we can change it without calling change_active_interface()
1670 if (!rcu_access_pointer(bond->curr_active_slave) &&
1671 new_slave->link == BOND_LINK_UP)
1672 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1675 } /* switch(bond_mode) */
1677 #ifdef CONFIG_NET_POLL_CONTROLLER
1678 slave_dev->npinfo = bond->dev->npinfo;
1679 if (slave_dev->npinfo) {
1680 if (slave_enable_netpoll(new_slave)) {
1681 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1688 if (!(bond_dev->features & NETIF_F_LRO))
1689 dev_disable_lro(slave_dev);
1691 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1694 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1698 res = bond_master_upper_dev_link(bond, new_slave);
1700 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1701 goto err_unregister;
1704 res = bond_sysfs_slave_add(new_slave);
1706 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1707 goto err_upper_unlink;
1711 bond_compute_features(bond);
1712 bond_set_carrier(bond);
1714 if (bond_uses_primary(bond)) {
1716 bond_select_active_slave(bond);
1717 unblock_netpoll_tx();
1720 if (bond_mode_uses_xmit_hash(bond))
1721 bond_update_slave_arr(bond, NULL);
1723 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1725 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1726 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1728 /* enslave is successful */
1729 bond_queue_slave_event(new_slave);
1732 /* Undo stages on error */
1734 bond_upper_dev_unlink(bond, new_slave);
1737 netdev_rx_handler_unregister(slave_dev);
1740 if (!bond_uses_primary(bond))
1741 bond_hw_addr_flush(bond_dev, slave_dev);
1743 vlan_vids_del_by_dev(slave_dev, bond_dev);
1744 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1745 RCU_INIT_POINTER(bond->primary_slave, NULL);
1746 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1748 bond_change_active_slave(bond, NULL);
1749 bond_select_active_slave(bond);
1750 unblock_netpoll_tx();
1752 /* either primary_slave or curr_active_slave might've changed */
1754 slave_disable_netpoll(new_slave);
1757 slave_dev->priv_flags &= ~IFF_BONDING;
1758 dev_close(slave_dev);
1761 slave_dev->flags &= ~IFF_SLAVE;
1762 if (!bond->params.fail_over_mac ||
1763 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1764 /* XXX TODO - fom follow mode needs to change master's
1765 * MAC if this slave's MAC is in use by the bond, or at
1766 * least print a warning.
1768 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1769 addr.sa_family = slave_dev->type;
1770 dev_set_mac_address(slave_dev, &addr);
1774 dev_set_mtu(slave_dev, new_slave->original_mtu);
1777 bond_free_slave(new_slave);
1780 /* Enslave of first slave has failed and we need to fix master's mac */
1781 if (!bond_has_slaves(bond)) {
1782 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1783 slave_dev->dev_addr))
1784 eth_hw_addr_random(bond_dev);
1785 if (bond_dev->type != ARPHRD_ETHER) {
1786 dev_close(bond_dev);
1787 ether_setup(bond_dev);
1788 bond_dev->flags |= IFF_MASTER;
1789 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1796 /* Try to release the slave device <slave> from the bond device <master>
1797 * It is legal to access curr_active_slave without a lock because all the function
1798 * is RTNL-locked. If "all" is true it means that the function is being called
1799 * while destroying a bond interface and all slaves are being released.
1801 * The rules for slave state should be:
1802 * for Active/Backup:
1803 * Active stays on all backups go down
1804 * for Bonded connections:
1805 * The first up interface should be left on and all others downed.
1807 static int __bond_release_one(struct net_device *bond_dev,
1808 struct net_device *slave_dev,
1811 struct bonding *bond = netdev_priv(bond_dev);
1812 struct slave *slave, *oldcurrent;
1813 struct sockaddr addr;
1814 int old_flags = bond_dev->flags;
1815 netdev_features_t old_features = bond_dev->features;
1817 /* slave is not a slave or master is not master of this slave */
1818 if (!(slave_dev->flags & IFF_SLAVE) ||
1819 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1820 netdev_dbg(bond_dev, "cannot release %s\n",
1827 slave = bond_get_slave_by_dev(bond, slave_dev);
1829 /* not a slave of this bond */
1830 netdev_info(bond_dev, "%s not enslaved\n",
1832 unblock_netpoll_tx();
1836 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1838 bond_sysfs_slave_del(slave);
1840 /* recompute stats just before removing the slave */
1841 bond_get_stats(bond->dev, &bond->bond_stats);
1843 bond_upper_dev_unlink(bond, slave);
1844 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1845 * for this slave anymore.
1847 netdev_rx_handler_unregister(slave_dev);
1849 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1850 bond_3ad_unbind_slave(slave);
1852 if (bond_mode_uses_xmit_hash(bond))
1853 bond_update_slave_arr(bond, slave);
1855 netdev_info(bond_dev, "Releasing %s interface %s\n",
1856 bond_is_active_slave(slave) ? "active" : "backup",
1859 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1861 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1863 if (!all && (!bond->params.fail_over_mac ||
1864 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1865 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1866 bond_has_slaves(bond))
1867 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",
1868 slave_dev->name, slave->perm_hwaddr,
1869 bond_dev->name, slave_dev->name);
1872 if (rtnl_dereference(bond->primary_slave) == slave)
1873 RCU_INIT_POINTER(bond->primary_slave, NULL);
1875 if (oldcurrent == slave)
1876 bond_change_active_slave(bond, NULL);
1878 if (bond_is_lb(bond)) {
1879 /* Must be called only after the slave has been
1880 * detached from the list and the curr_active_slave
1881 * has been cleared (if our_slave == old_current),
1882 * but before a new active slave is selected.
1884 bond_alb_deinit_slave(bond, slave);
1888 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1889 } else if (oldcurrent == slave) {
1890 /* Note that we hold RTNL over this sequence, so there
1891 * is no concern that another slave add/remove event
1894 bond_select_active_slave(bond);
1897 if (!bond_has_slaves(bond)) {
1898 bond_set_carrier(bond);
1899 eth_hw_addr_random(bond_dev);
1902 unblock_netpoll_tx();
1906 if (!bond_has_slaves(bond)) {
1907 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1908 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1911 bond_compute_features(bond);
1912 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1913 (old_features & NETIF_F_VLAN_CHALLENGED))
1914 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1915 slave_dev->name, bond_dev->name);
1917 vlan_vids_del_by_dev(slave_dev, bond_dev);
1919 /* If the mode uses primary, then this case was handled above by
1920 * bond_change_active_slave(..., NULL)
1922 if (!bond_uses_primary(bond)) {
1923 /* unset promiscuity level from slave
1924 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1925 * of the IFF_PROMISC flag in the bond_dev, but we need the
1926 * value of that flag before that change, as that was the value
1927 * when this slave was attached, so we cache at the start of the
1928 * function and use it here. Same goes for ALLMULTI below
1930 if (old_flags & IFF_PROMISC)
1931 dev_set_promiscuity(slave_dev, -1);
1933 /* unset allmulti level from slave */
1934 if (old_flags & IFF_ALLMULTI)
1935 dev_set_allmulti(slave_dev, -1);
1937 bond_hw_addr_flush(bond_dev, slave_dev);
1940 slave_disable_netpoll(slave);
1942 /* close slave before restoring its mac address */
1943 dev_close(slave_dev);
1945 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1946 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1947 /* restore original ("permanent") mac address */
1948 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1949 addr.sa_family = slave_dev->type;
1950 dev_set_mac_address(slave_dev, &addr);
1953 dev_set_mtu(slave_dev, slave->original_mtu);
1955 slave_dev->priv_flags &= ~IFF_BONDING;
1957 bond_free_slave(slave);
1962 /* A wrapper used because of ndo_del_link */
1963 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1965 return __bond_release_one(bond_dev, slave_dev, false);
1968 /* First release a slave and then destroy the bond if no more slaves are left.
1969 * Must be under rtnl_lock when this function is called.
1971 static int bond_release_and_destroy(struct net_device *bond_dev,
1972 struct net_device *slave_dev)
1974 struct bonding *bond = netdev_priv(bond_dev);
1977 ret = bond_release(bond_dev, slave_dev);
1978 if (ret == 0 && !bond_has_slaves(bond)) {
1979 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1980 netdev_info(bond_dev, "Destroying bond %s\n",
1982 bond_remove_proc_entry(bond);
1983 unregister_netdevice(bond_dev);
1988 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1990 struct bonding *bond = netdev_priv(bond_dev);
1991 bond_fill_ifbond(bond, info);
1995 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1997 struct bonding *bond = netdev_priv(bond_dev);
1998 struct list_head *iter;
1999 int i = 0, res = -ENODEV;
2000 struct slave *slave;
2002 bond_for_each_slave(bond, slave, iter) {
2003 if (i++ == (int)info->slave_id) {
2005 bond_fill_ifslave(slave, info);
2013 /*-------------------------------- Monitoring -------------------------------*/
2015 /* called with rcu_read_lock() */
2016 static int bond_miimon_inspect(struct bonding *bond)
2018 int link_state, commit = 0;
2019 struct list_head *iter;
2020 struct slave *slave;
2021 bool ignore_updelay;
2023 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2025 bond_for_each_slave_rcu(bond, slave, iter) {
2026 slave->new_link = BOND_LINK_NOCHANGE;
2028 link_state = bond_check_dev_link(bond, slave->dev, 0);
2030 switch (slave->link) {
2035 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2036 BOND_SLAVE_NOTIFY_LATER);
2037 slave->delay = bond->params.downdelay;
2039 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2041 BOND_MODE_ACTIVEBACKUP) ?
2042 (bond_is_active_slave(slave) ?
2043 "active " : "backup ") : "",
2045 bond->params.downdelay * bond->params.miimon);
2048 case BOND_LINK_FAIL:
2050 /* recovered before downdelay expired */
2051 bond_set_slave_link_state(slave, BOND_LINK_UP,
2052 BOND_SLAVE_NOTIFY_LATER);
2053 slave->last_link_up = jiffies;
2054 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2055 (bond->params.downdelay - slave->delay) *
2056 bond->params.miimon,
2061 if (slave->delay <= 0) {
2062 slave->new_link = BOND_LINK_DOWN;
2070 case BOND_LINK_DOWN:
2074 bond_set_slave_link_state(slave, BOND_LINK_BACK,
2075 BOND_SLAVE_NOTIFY_LATER);
2076 slave->delay = bond->params.updelay;
2079 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2081 ignore_updelay ? 0 :
2082 bond->params.updelay *
2083 bond->params.miimon);
2086 case BOND_LINK_BACK:
2088 bond_set_slave_link_state(slave,
2090 BOND_SLAVE_NOTIFY_LATER);
2091 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2092 (bond->params.updelay - slave->delay) *
2093 bond->params.miimon,
2102 if (slave->delay <= 0) {
2103 slave->new_link = BOND_LINK_UP;
2105 ignore_updelay = false;
2117 static void bond_miimon_commit(struct bonding *bond)
2119 struct list_head *iter;
2120 struct slave *slave, *primary;
2122 bond_for_each_slave(bond, slave, iter) {
2123 switch (slave->new_link) {
2124 case BOND_LINK_NOCHANGE:
2128 bond_set_slave_link_state(slave, BOND_LINK_UP,
2129 BOND_SLAVE_NOTIFY_NOW);
2130 slave->last_link_up = jiffies;
2132 primary = rtnl_dereference(bond->primary_slave);
2133 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2134 /* prevent it from being the active one */
2135 bond_set_backup_slave(slave);
2136 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2137 /* make it immediately active */
2138 bond_set_active_slave(slave);
2139 } else if (slave != primary) {
2140 /* prevent it from being the active one */
2141 bond_set_backup_slave(slave);
2144 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2146 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2147 slave->duplex ? "full" : "half");
2149 /* notify ad that the link status has changed */
2150 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2151 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2153 if (bond_is_lb(bond))
2154 bond_alb_handle_link_change(bond, slave,
2157 if (BOND_MODE(bond) == BOND_MODE_XOR)
2158 bond_update_slave_arr(bond, NULL);
2160 if (!bond->curr_active_slave || slave == primary)
2165 case BOND_LINK_DOWN:
2166 if (slave->link_failure_count < UINT_MAX)
2167 slave->link_failure_count++;
2169 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2170 BOND_SLAVE_NOTIFY_NOW);
2172 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2173 BOND_MODE(bond) == BOND_MODE_8023AD)
2174 bond_set_slave_inactive_flags(slave,
2175 BOND_SLAVE_NOTIFY_NOW);
2177 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2180 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2181 bond_3ad_handle_link_change(slave,
2184 if (bond_is_lb(bond))
2185 bond_alb_handle_link_change(bond, slave,
2188 if (BOND_MODE(bond) == BOND_MODE_XOR)
2189 bond_update_slave_arr(bond, NULL);
2191 if (slave == rcu_access_pointer(bond->curr_active_slave))
2197 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2198 slave->new_link, slave->dev->name);
2199 slave->new_link = BOND_LINK_NOCHANGE;
2206 bond_select_active_slave(bond);
2207 unblock_netpoll_tx();
2210 bond_set_carrier(bond);
2215 * Really a wrapper that splits the mii monitor into two phases: an
2216 * inspection, then (if inspection indicates something needs to be done)
2217 * an acquisition of appropriate locks followed by a commit phase to
2218 * implement whatever link state changes are indicated.
2220 static void bond_mii_monitor(struct work_struct *work)
2222 struct bonding *bond = container_of(work, struct bonding,
2224 bool should_notify_peers = false;
2225 unsigned long delay;
2227 delay = msecs_to_jiffies(bond->params.miimon);
2229 if (!bond_has_slaves(bond))
2234 should_notify_peers = bond_should_notify_peers(bond);
2236 if (bond_miimon_inspect(bond)) {
2239 /* Race avoidance with bond_close cancel of workqueue */
2240 if (!rtnl_trylock()) {
2242 should_notify_peers = false;
2246 bond_miimon_commit(bond);
2248 rtnl_unlock(); /* might sleep, hold no other locks */
2253 if (bond->params.miimon)
2254 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2256 if (should_notify_peers) {
2257 if (!rtnl_trylock())
2259 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2264 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2266 struct net_device *upper;
2267 struct list_head *iter;
2270 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2274 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2275 if (ip == bond_confirm_addr(upper, 0, ip)) {
2285 /* We go to the (large) trouble of VLAN tagging ARP frames because
2286 * switches in VLAN mode (especially if ports are configured as
2287 * "native" to a VLAN) might not pass non-tagged frames.
2289 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2290 __be32 dest_ip, __be32 src_ip,
2291 struct bond_vlan_tag *tags)
2293 struct sk_buff *skb;
2294 struct bond_vlan_tag *outer_tag = tags;
2296 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2297 arp_op, slave_dev->name, &dest_ip, &src_ip);
2299 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2300 NULL, slave_dev->dev_addr, NULL);
2303 net_err_ratelimited("ARP packet allocation failed\n");
2307 if (!tags || tags->vlan_proto == VLAN_N_VID)
2312 /* Go through all the tags backwards and add them to the packet */
2313 while (tags->vlan_proto != VLAN_N_VID) {
2314 if (!tags->vlan_id) {
2319 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2320 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2321 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2324 net_err_ratelimited("failed to insert inner VLAN tag\n");
2330 /* Set the outer tag */
2331 if (outer_tag->vlan_id) {
2332 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2333 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2334 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2335 outer_tag->vlan_id);
2342 /* Validate the device path between the @start_dev and the @end_dev.
2343 * The path is valid if the @end_dev is reachable through device
2345 * When the path is validated, collect any vlan information in the
2348 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2349 struct net_device *end_dev,
2352 struct bond_vlan_tag *tags;
2353 struct net_device *upper;
2354 struct list_head *iter;
2356 if (start_dev == end_dev) {
2357 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2359 return ERR_PTR(-ENOMEM);
2360 tags[level].vlan_proto = VLAN_N_VID;
2364 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2365 tags = bond_verify_device_path(upper, end_dev, level + 1);
2366 if (IS_ERR_OR_NULL(tags)) {
2371 if (is_vlan_dev(upper)) {
2372 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2373 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2382 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2385 struct bond_vlan_tag *tags;
2386 __be32 *targets = bond->params.arp_targets, addr;
2389 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2390 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2393 /* Find out through which dev should the packet go */
2394 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2397 /* there's no route to target - try to send arp
2398 * probe to generate any traffic (arp_validate=0)
2400 if (bond->params.arp_validate)
2401 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2404 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2409 /* bond device itself */
2410 if (rt->dst.dev == bond->dev)
2414 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2417 if (!IS_ERR_OR_NULL(tags))
2420 /* Not our device - skip */
2421 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2422 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2428 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2430 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2436 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2440 if (!sip || !bond_has_this_ip(bond, tip)) {
2441 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2446 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2448 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2452 slave->last_rx = jiffies;
2453 slave->target_last_arp_rx[i] = jiffies;
2456 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2457 struct slave *slave)
2459 struct arphdr *arp = (struct arphdr *)skb->data;
2460 struct slave *curr_active_slave;
2461 unsigned char *arp_ptr;
2463 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2465 if (!slave_do_arp_validate(bond, slave)) {
2466 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2467 !slave_do_arp_validate_only(bond))
2468 slave->last_rx = jiffies;
2469 return RX_HANDLER_ANOTHER;
2470 } else if (!is_arp) {
2471 return RX_HANDLER_ANOTHER;
2474 alen = arp_hdr_len(bond->dev);
2476 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2479 if (alen > skb_headlen(skb)) {
2480 arp = kmalloc(alen, GFP_ATOMIC);
2483 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2487 if (arp->ar_hln != bond->dev->addr_len ||
2488 skb->pkt_type == PACKET_OTHERHOST ||
2489 skb->pkt_type == PACKET_LOOPBACK ||
2490 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2491 arp->ar_pro != htons(ETH_P_IP) ||
2495 arp_ptr = (unsigned char *)(arp + 1);
2496 arp_ptr += bond->dev->addr_len;
2497 memcpy(&sip, arp_ptr, 4);
2498 arp_ptr += 4 + bond->dev->addr_len;
2499 memcpy(&tip, arp_ptr, 4);
2501 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2502 slave->dev->name, bond_slave_state(slave),
2503 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2506 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2508 /* Backup slaves won't see the ARP reply, but do come through
2509 * here for each ARP probe (so we swap the sip/tip to validate
2510 * the probe). In a "redundant switch, common router" type of
2511 * configuration, the ARP probe will (hopefully) travel from
2512 * the active, through one switch, the router, then the other
2513 * switch before reaching the backup.
2515 * We 'trust' the arp requests if there is an active slave and
2516 * it received valid arp reply(s) after it became active. This
2517 * is done to avoid endless looping when we can't reach the
2518 * arp_ip_target and fool ourselves with our own arp requests.
2521 if (bond_is_active_slave(slave))
2522 bond_validate_arp(bond, slave, sip, tip);
2523 else if (curr_active_slave &&
2524 time_after(slave_last_rx(bond, curr_active_slave),
2525 curr_active_slave->last_link_up))
2526 bond_validate_arp(bond, slave, tip, sip);
2529 if (arp != (struct arphdr *)skb->data)
2531 return RX_HANDLER_ANOTHER;
2534 /* function to verify if we're in the arp_interval timeslice, returns true if
2535 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2536 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2538 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2541 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2543 return time_in_range(jiffies,
2544 last_act - delta_in_ticks,
2545 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2548 /* This function is called regularly to monitor each slave's link
2549 * ensuring that traffic is being sent and received when arp monitoring
2550 * is used in load-balancing mode. if the adapter has been dormant, then an
2551 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2552 * arp monitoring in active backup mode.
2554 static void bond_loadbalance_arp_mon(struct work_struct *work)
2556 struct bonding *bond = container_of(work, struct bonding,
2558 struct slave *slave, *oldcurrent;
2559 struct list_head *iter;
2560 int do_failover = 0, slave_state_changed = 0;
2562 if (!bond_has_slaves(bond))
2567 oldcurrent = rcu_dereference(bond->curr_active_slave);
2568 /* see if any of the previous devices are up now (i.e. they have
2569 * xmt and rcv traffic). the curr_active_slave does not come into
2570 * the picture unless it is null. also, slave->last_link_up is not
2571 * needed here because we send an arp on each slave and give a slave
2572 * as long as it needs to get the tx/rx within the delta.
2573 * TODO: what about up/down delay in arp mode? it wasn't here before
2576 bond_for_each_slave_rcu(bond, slave, iter) {
2577 unsigned long trans_start = dev_trans_start(slave->dev);
2579 if (slave->link != BOND_LINK_UP) {
2580 if (bond_time_in_interval(bond, trans_start, 1) &&
2581 bond_time_in_interval(bond, slave->last_rx, 1)) {
2583 slave->link = BOND_LINK_UP;
2584 slave_state_changed = 1;
2586 /* primary_slave has no meaning in round-robin
2587 * mode. the window of a slave being up and
2588 * curr_active_slave being null after enslaving
2592 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2596 netdev_info(bond->dev, "interface %s is now up\n",
2601 /* slave->link == BOND_LINK_UP */
2603 /* not all switches will respond to an arp request
2604 * when the source ip is 0, so don't take the link down
2605 * if we don't know our ip yet
2607 if (!bond_time_in_interval(bond, trans_start, 2) ||
2608 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2610 slave->link = BOND_LINK_DOWN;
2611 slave_state_changed = 1;
2613 if (slave->link_failure_count < UINT_MAX)
2614 slave->link_failure_count++;
2616 netdev_info(bond->dev, "interface %s is now down\n",
2619 if (slave == oldcurrent)
2624 /* note: if switch is in round-robin mode, all links
2625 * must tx arp to ensure all links rx an arp - otherwise
2626 * links may oscillate or not come up at all; if switch is
2627 * in something like xor mode, there is nothing we can
2628 * do - all replies will be rx'ed on same link causing slaves
2629 * to be unstable during low/no traffic periods
2631 if (bond_slave_is_up(slave))
2632 bond_arp_send_all(bond, slave);
2637 if (do_failover || slave_state_changed) {
2638 if (!rtnl_trylock())
2641 if (slave_state_changed) {
2642 bond_slave_state_change(bond);
2643 if (BOND_MODE(bond) == BOND_MODE_XOR)
2644 bond_update_slave_arr(bond, NULL);
2648 bond_select_active_slave(bond);
2649 unblock_netpoll_tx();
2655 if (bond->params.arp_interval)
2656 queue_delayed_work(bond->wq, &bond->arp_work,
2657 msecs_to_jiffies(bond->params.arp_interval));
2660 /* Called to inspect slaves for active-backup mode ARP monitor link state
2661 * changes. Sets new_link in slaves to specify what action should take
2662 * place for the slave. Returns 0 if no changes are found, >0 if changes
2663 * to link states must be committed.
2665 * Called with rcu_read_lock held.
2667 static int bond_ab_arp_inspect(struct bonding *bond)
2669 unsigned long trans_start, last_rx;
2670 struct list_head *iter;
2671 struct slave *slave;
2674 bond_for_each_slave_rcu(bond, slave, iter) {
2675 slave->new_link = BOND_LINK_NOCHANGE;
2676 last_rx = slave_last_rx(bond, slave);
2678 if (slave->link != BOND_LINK_UP) {
2679 if (bond_time_in_interval(bond, last_rx, 1)) {
2680 slave->new_link = BOND_LINK_UP;
2686 /* Give slaves 2*delta after being enslaved or made
2687 * active. This avoids bouncing, as the last receive
2688 * times need a full ARP monitor cycle to be updated.
2690 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2693 /* Backup slave is down if:
2694 * - No current_arp_slave AND
2695 * - more than 3*delta since last receive AND
2696 * - the bond has an IP address
2698 * Note: a non-null current_arp_slave indicates
2699 * the curr_active_slave went down and we are
2700 * searching for a new one; under this condition
2701 * we only take the curr_active_slave down - this
2702 * gives each slave a chance to tx/rx traffic
2703 * before being taken out
2705 if (!bond_is_active_slave(slave) &&
2706 !rcu_access_pointer(bond->current_arp_slave) &&
2707 !bond_time_in_interval(bond, last_rx, 3)) {
2708 slave->new_link = BOND_LINK_DOWN;
2712 /* Active slave is down if:
2713 * - more than 2*delta since transmitting OR
2714 * - (more than 2*delta since receive AND
2715 * the bond has an IP address)
2717 trans_start = dev_trans_start(slave->dev);
2718 if (bond_is_active_slave(slave) &&
2719 (!bond_time_in_interval(bond, trans_start, 2) ||
2720 !bond_time_in_interval(bond, last_rx, 2))) {
2721 slave->new_link = BOND_LINK_DOWN;
2729 /* Called to commit link state changes noted by inspection step of
2730 * active-backup mode ARP monitor.
2732 * Called with RTNL hold.
2734 static void bond_ab_arp_commit(struct bonding *bond)
2736 unsigned long trans_start;
2737 struct list_head *iter;
2738 struct slave *slave;
2740 bond_for_each_slave(bond, slave, iter) {
2741 switch (slave->new_link) {
2742 case BOND_LINK_NOCHANGE:
2746 trans_start = dev_trans_start(slave->dev);
2747 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2748 (!rtnl_dereference(bond->curr_active_slave) &&
2749 bond_time_in_interval(bond, trans_start, 1))) {
2750 struct slave *current_arp_slave;
2752 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2753 bond_set_slave_link_state(slave, BOND_LINK_UP,
2754 BOND_SLAVE_NOTIFY_NOW);
2755 if (current_arp_slave) {
2756 bond_set_slave_inactive_flags(
2758 BOND_SLAVE_NOTIFY_NOW);
2759 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2762 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2765 if (!rtnl_dereference(bond->curr_active_slave) ||
2766 slave == rtnl_dereference(bond->primary_slave))
2773 case BOND_LINK_DOWN:
2774 if (slave->link_failure_count < UINT_MAX)
2775 slave->link_failure_count++;
2777 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2778 BOND_SLAVE_NOTIFY_NOW);
2779 bond_set_slave_inactive_flags(slave,
2780 BOND_SLAVE_NOTIFY_NOW);
2782 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2785 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2786 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2793 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2794 slave->new_link, slave->dev->name);
2800 bond_select_active_slave(bond);
2801 unblock_netpoll_tx();
2804 bond_set_carrier(bond);
2807 /* Send ARP probes for active-backup mode ARP monitor.
2809 * Called with rcu_read_lock held.
2811 static bool bond_ab_arp_probe(struct bonding *bond)
2813 struct slave *slave, *before = NULL, *new_slave = NULL,
2814 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2815 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2816 struct list_head *iter;
2818 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2820 if (curr_arp_slave && curr_active_slave)
2821 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2822 curr_arp_slave->dev->name,
2823 curr_active_slave->dev->name);
2825 if (curr_active_slave) {
2826 bond_arp_send_all(bond, curr_active_slave);
2827 return should_notify_rtnl;
2830 /* if we don't have a curr_active_slave, search for the next available
2831 * backup slave from the current_arp_slave and make it the candidate
2832 * for becoming the curr_active_slave
2835 if (!curr_arp_slave) {
2836 curr_arp_slave = bond_first_slave_rcu(bond);
2837 if (!curr_arp_slave)
2838 return should_notify_rtnl;
2841 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2843 bond_for_each_slave_rcu(bond, slave, iter) {
2844 if (!found && !before && bond_slave_is_up(slave))
2847 if (found && !new_slave && bond_slave_is_up(slave))
2849 /* if the link state is up at this point, we
2850 * mark it down - this can happen if we have
2851 * simultaneous link failures and
2852 * reselect_active_interface doesn't make this
2853 * one the current slave so it is still marked
2854 * up when it is actually down
2856 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2857 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2858 BOND_SLAVE_NOTIFY_LATER);
2859 if (slave->link_failure_count < UINT_MAX)
2860 slave->link_failure_count++;
2862 bond_set_slave_inactive_flags(slave,
2863 BOND_SLAVE_NOTIFY_LATER);
2865 netdev_info(bond->dev, "backup interface %s is now down\n",
2868 if (slave == curr_arp_slave)
2872 if (!new_slave && before)
2878 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2879 BOND_SLAVE_NOTIFY_LATER);
2880 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2881 bond_arp_send_all(bond, new_slave);
2882 new_slave->last_link_up = jiffies;
2883 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2886 bond_for_each_slave_rcu(bond, slave, iter) {
2887 if (slave->should_notify || slave->should_notify_link) {
2888 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2892 return should_notify_rtnl;
2895 static void bond_activebackup_arp_mon(struct work_struct *work)
2897 struct bonding *bond = container_of(work, struct bonding,
2899 bool should_notify_peers = false;
2900 bool should_notify_rtnl = false;
2903 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2905 if (!bond_has_slaves(bond))
2910 should_notify_peers = bond_should_notify_peers(bond);
2912 if (bond_ab_arp_inspect(bond)) {
2915 /* Race avoidance with bond_close flush of workqueue */
2916 if (!rtnl_trylock()) {
2918 should_notify_peers = false;
2922 bond_ab_arp_commit(bond);
2928 should_notify_rtnl = bond_ab_arp_probe(bond);
2932 if (bond->params.arp_interval)
2933 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2935 if (should_notify_peers || should_notify_rtnl) {
2936 if (!rtnl_trylock())
2939 if (should_notify_peers)
2940 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2942 if (should_notify_rtnl) {
2943 bond_slave_state_notify(bond);
2944 bond_slave_link_notify(bond);
2951 /*-------------------------- netdev event handling --------------------------*/
2953 /* Change device name */
2954 static int bond_event_changename(struct bonding *bond)
2956 bond_remove_proc_entry(bond);
2957 bond_create_proc_entry(bond);
2959 bond_debug_reregister(bond);
2964 static int bond_master_netdev_event(unsigned long event,
2965 struct net_device *bond_dev)
2967 struct bonding *event_bond = netdev_priv(bond_dev);
2970 case NETDEV_CHANGENAME:
2971 return bond_event_changename(event_bond);
2972 case NETDEV_UNREGISTER:
2973 bond_remove_proc_entry(event_bond);
2975 case NETDEV_REGISTER:
2976 bond_create_proc_entry(event_bond);
2978 case NETDEV_NOTIFY_PEERS:
2979 if (event_bond->send_peer_notif)
2980 event_bond->send_peer_notif--;
2989 static int bond_slave_netdev_event(unsigned long event,
2990 struct net_device *slave_dev)
2992 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2993 struct bonding *bond;
2994 struct net_device *bond_dev;
2996 /* A netdev event can be generated while enslaving a device
2997 * before netdev_rx_handler_register is called in which case
2998 * slave will be NULL
3002 bond_dev = slave->bond->dev;
3004 primary = rtnl_dereference(bond->primary_slave);
3007 case NETDEV_UNREGISTER:
3008 if (bond_dev->type != ARPHRD_ETHER)
3009 bond_release_and_destroy(bond_dev, slave_dev);
3011 bond_release(bond_dev, slave_dev);
3015 bond_update_speed_duplex(slave);
3016 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3017 bond_3ad_adapter_speed_duplex_changed(slave);
3020 /* Refresh slave-array if applicable!
3021 * If the setup does not use miimon or arpmon (mode-specific!),
3022 * then these events will not cause the slave-array to be
3023 * refreshed. This will cause xmit to use a slave that is not
3024 * usable. Avoid such situation by refeshing the array at these
3025 * events. If these (miimon/arpmon) parameters are configured
3026 * then array gets refreshed twice and that should be fine!
3028 if (bond_mode_uses_xmit_hash(bond))
3029 bond_update_slave_arr(bond, NULL);
3031 case NETDEV_CHANGEMTU:
3032 /* TODO: Should slaves be allowed to
3033 * independently alter their MTU? For
3034 * an active-backup bond, slaves need
3035 * not be the same type of device, so
3036 * MTUs may vary. For other modes,
3037 * slaves arguably should have the
3038 * same MTUs. To do this, we'd need to
3039 * take over the slave's change_mtu
3040 * function for the duration of their
3044 case NETDEV_CHANGENAME:
3045 /* we don't care if we don't have primary set */
3046 if (!bond_uses_primary(bond) ||
3047 !bond->params.primary[0])
3050 if (slave == primary) {
3051 /* slave's name changed - he's no longer primary */
3052 RCU_INIT_POINTER(bond->primary_slave, NULL);
3053 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3054 /* we have a new primary slave */
3055 rcu_assign_pointer(bond->primary_slave, slave);
3056 } else { /* we didn't change primary - exit */
3060 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3061 primary ? slave_dev->name : "none");
3064 bond_select_active_slave(bond);
3065 unblock_netpoll_tx();
3067 case NETDEV_FEAT_CHANGE:
3068 bond_compute_features(bond);
3070 case NETDEV_RESEND_IGMP:
3071 /* Propagate to master device */
3072 call_netdevice_notifiers(event, slave->bond->dev);
3081 /* bond_netdev_event: handle netdev notifier chain events.
3083 * This function receives events for the netdev chain. The caller (an
3084 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3085 * locks for us to safely manipulate the slave devices (RTNL lock,
3088 static int bond_netdev_event(struct notifier_block *this,
3089 unsigned long event, void *ptr)
3091 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3093 netdev_dbg(event_dev, "event: %lx\n", event);
3095 if (!(event_dev->priv_flags & IFF_BONDING))
3098 if (event_dev->flags & IFF_MASTER) {
3099 netdev_dbg(event_dev, "IFF_MASTER\n");
3100 return bond_master_netdev_event(event, event_dev);
3103 if (event_dev->flags & IFF_SLAVE) {
3104 netdev_dbg(event_dev, "IFF_SLAVE\n");
3105 return bond_slave_netdev_event(event, event_dev);
3111 static struct notifier_block bond_netdev_notifier = {
3112 .notifier_call = bond_netdev_event,
3115 /*---------------------------- Hashing Policies -----------------------------*/
3117 /* L2 hash helper */
3118 static inline u32 bond_eth_hash(struct sk_buff *skb)
3120 struct ethhdr *ep, hdr_tmp;
3122 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3124 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3128 /* Extract the appropriate headers based on bond's xmit policy */
3129 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3130 struct flow_keys *fk)
3132 const struct ipv6hdr *iph6;
3133 const struct iphdr *iph;
3134 int noff, proto = -1;
3136 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3137 return skb_flow_dissect_flow_keys(skb, fk, 0);
3139 fk->ports.ports = 0;
3140 noff = skb_network_offset(skb);
3141 if (skb->protocol == htons(ETH_P_IP)) {
3142 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3145 iph_to_flow_copy_v4addrs(fk, iph);
3146 noff += iph->ihl << 2;
3147 if (!ip_is_fragment(iph))
3148 proto = iph->protocol;
3149 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3150 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3152 iph6 = ipv6_hdr(skb);
3153 iph_to_flow_copy_v6addrs(fk, iph6);
3154 noff += sizeof(*iph6);
3155 proto = iph6->nexthdr;
3159 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3160 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3166 * bond_xmit_hash - generate a hash value based on the xmit policy
3167 * @bond: bonding device
3168 * @skb: buffer to use for headers
3170 * This function will extract the necessary headers from the skb buffer and use
3171 * them to generate a hash based on the xmit_policy set in the bonding device
3173 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3175 struct flow_keys flow;
3178 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3182 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3183 !bond_flow_dissect(bond, skb, &flow))
3184 return bond_eth_hash(skb);
3186 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3187 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3188 hash = bond_eth_hash(skb);
3190 hash = (__force u32)flow.ports.ports;
3191 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3192 (__force u32)flow_get_u32_src(&flow);
3193 hash ^= (hash >> 16);
3194 hash ^= (hash >> 8);
3199 /*-------------------------- Device entry points ----------------------------*/
3201 static void bond_work_init_all(struct bonding *bond)
3203 INIT_DELAYED_WORK(&bond->mcast_work,
3204 bond_resend_igmp_join_requests_delayed);
3205 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3206 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3207 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3208 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3210 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3211 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3212 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3215 static void bond_work_cancel_all(struct bonding *bond)
3217 cancel_delayed_work_sync(&bond->mii_work);
3218 cancel_delayed_work_sync(&bond->arp_work);
3219 cancel_delayed_work_sync(&bond->alb_work);
3220 cancel_delayed_work_sync(&bond->ad_work);
3221 cancel_delayed_work_sync(&bond->mcast_work);
3222 cancel_delayed_work_sync(&bond->slave_arr_work);
3225 static int bond_open(struct net_device *bond_dev)
3227 struct bonding *bond = netdev_priv(bond_dev);
3228 struct list_head *iter;
3229 struct slave *slave;
3231 /* reset slave->backup and slave->inactive */
3232 if (bond_has_slaves(bond)) {
3233 bond_for_each_slave(bond, slave, iter) {
3234 if (bond_uses_primary(bond) &&
3235 slave != rcu_access_pointer(bond->curr_active_slave)) {
3236 bond_set_slave_inactive_flags(slave,
3237 BOND_SLAVE_NOTIFY_NOW);
3238 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3239 bond_set_slave_active_flags(slave,
3240 BOND_SLAVE_NOTIFY_NOW);
3245 bond_work_init_all(bond);
3247 if (bond_is_lb(bond)) {
3248 /* bond_alb_initialize must be called before the timer
3251 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3253 if (bond->params.tlb_dynamic_lb)
3254 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3257 if (bond->params.miimon) /* link check interval, in milliseconds. */
3258 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3260 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3261 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3262 bond->recv_probe = bond_arp_rcv;
3265 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3266 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3267 /* register to receive LACPDUs */
3268 bond->recv_probe = bond_3ad_lacpdu_recv;
3269 bond_3ad_initiate_agg_selection(bond, 1);
3272 if (bond_mode_uses_xmit_hash(bond))
3273 bond_update_slave_arr(bond, NULL);
3278 static int bond_close(struct net_device *bond_dev)
3280 struct bonding *bond = netdev_priv(bond_dev);
3282 bond_work_cancel_all(bond);
3283 bond->send_peer_notif = 0;
3284 if (bond_is_lb(bond))
3285 bond_alb_deinitialize(bond);
3286 bond->recv_probe = NULL;
3291 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3292 struct rtnl_link_stats64 *stats)
3294 struct bonding *bond = netdev_priv(bond_dev);
3295 struct rtnl_link_stats64 temp;
3296 struct list_head *iter;
3297 struct slave *slave;
3299 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3301 bond_for_each_slave(bond, slave, iter) {
3302 const struct rtnl_link_stats64 *sstats =
3303 dev_get_stats(slave->dev, &temp);
3304 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3306 stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
3307 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3308 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3309 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3310 stats->rx_nohandler += sstats->rx_nohandler - pstats->rx_nohandler;
3312 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3313 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3314 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3315 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3317 stats->multicast += sstats->multicast - pstats->multicast;
3318 stats->collisions += sstats->collisions - pstats->collisions;
3320 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3321 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3322 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3323 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3324 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3325 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3327 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3328 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3329 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3330 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3331 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3333 /* save off the slave stats for the next run */
3334 memcpy(pstats, sstats, sizeof(*sstats));
3336 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3341 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3343 struct bonding *bond = netdev_priv(bond_dev);
3344 struct net_device *slave_dev = NULL;
3345 struct ifbond k_binfo;
3346 struct ifbond __user *u_binfo = NULL;
3347 struct ifslave k_sinfo;
3348 struct ifslave __user *u_sinfo = NULL;
3349 struct mii_ioctl_data *mii = NULL;
3350 struct bond_opt_value newval;
3354 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3365 /* We do this again just in case we were called by SIOCGMIIREG
3366 * instead of SIOCGMIIPHY.
3372 if (mii->reg_num == 1) {
3374 if (netif_carrier_ok(bond->dev))
3375 mii->val_out = BMSR_LSTATUS;
3379 case BOND_INFO_QUERY_OLD:
3380 case SIOCBONDINFOQUERY:
3381 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3383 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3386 res = bond_info_query(bond_dev, &k_binfo);
3388 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3392 case BOND_SLAVE_INFO_QUERY_OLD:
3393 case SIOCBONDSLAVEINFOQUERY:
3394 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3396 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3399 res = bond_slave_info_query(bond_dev, &k_sinfo);
3401 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3409 net = dev_net(bond_dev);
3411 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3414 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3416 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3421 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3423 case BOND_ENSLAVE_OLD:
3424 case SIOCBONDENSLAVE:
3425 res = bond_enslave(bond_dev, slave_dev);
3427 case BOND_RELEASE_OLD:
3428 case SIOCBONDRELEASE:
3429 res = bond_release(bond_dev, slave_dev);
3431 case BOND_SETHWADDR_OLD:
3432 case SIOCBONDSETHWADDR:
3433 bond_set_dev_addr(bond_dev, slave_dev);
3436 case BOND_CHANGE_ACTIVE_OLD:
3437 case SIOCBONDCHANGEACTIVE:
3438 bond_opt_initstr(&newval, slave_dev->name);
3439 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3448 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3450 struct bonding *bond = netdev_priv(bond_dev);
3452 if (change & IFF_PROMISC)
3453 bond_set_promiscuity(bond,
3454 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3456 if (change & IFF_ALLMULTI)
3457 bond_set_allmulti(bond,
3458 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3461 static void bond_set_rx_mode(struct net_device *bond_dev)
3463 struct bonding *bond = netdev_priv(bond_dev);
3464 struct list_head *iter;
3465 struct slave *slave;
3468 if (bond_uses_primary(bond)) {
3469 slave = rcu_dereference(bond->curr_active_slave);
3471 dev_uc_sync(slave->dev, bond_dev);
3472 dev_mc_sync(slave->dev, bond_dev);
3475 bond_for_each_slave_rcu(bond, slave, iter) {
3476 dev_uc_sync_multiple(slave->dev, bond_dev);
3477 dev_mc_sync_multiple(slave->dev, bond_dev);
3483 static int bond_neigh_init(struct neighbour *n)
3485 struct bonding *bond = netdev_priv(n->dev);
3486 const struct net_device_ops *slave_ops;
3487 struct neigh_parms parms;
3488 struct slave *slave;
3491 slave = bond_first_slave(bond);
3494 slave_ops = slave->dev->netdev_ops;
3495 if (!slave_ops->ndo_neigh_setup)
3498 parms.neigh_setup = NULL;
3499 parms.neigh_cleanup = NULL;
3500 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3504 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3505 * after the last slave has been detached. Assumes that all slaves
3506 * utilize the same neigh_cleanup (true at this writing as only user
3509 n->parms->neigh_cleanup = parms.neigh_cleanup;
3511 if (!parms.neigh_setup)
3514 return parms.neigh_setup(n);
3517 /* The bonding ndo_neigh_setup is called at init time beofre any
3518 * slave exists. So we must declare proxy setup function which will
3519 * be used at run time to resolve the actual slave neigh param setup.
3521 * It's also called by master devices (such as vlans) to setup their
3522 * underlying devices. In that case - do nothing, we're already set up from
3525 static int bond_neigh_setup(struct net_device *dev,
3526 struct neigh_parms *parms)
3528 /* modify only our neigh_parms */
3529 if (parms->dev == dev)
3530 parms->neigh_setup = bond_neigh_init;
3535 /* Change the MTU of all of a master's slaves to match the master */
3536 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3538 struct bonding *bond = netdev_priv(bond_dev);
3539 struct slave *slave, *rollback_slave;
3540 struct list_head *iter;
3543 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3545 bond_for_each_slave(bond, slave, iter) {
3546 netdev_dbg(bond_dev, "s %p c_m %p\n",
3547 slave, slave->dev->netdev_ops->ndo_change_mtu);
3549 res = dev_set_mtu(slave->dev, new_mtu);
3552 /* If we failed to set the slave's mtu to the new value
3553 * we must abort the operation even in ACTIVE_BACKUP
3554 * mode, because if we allow the backup slaves to have
3555 * different mtu values than the active slave we'll
3556 * need to change their mtu when doing a failover. That
3557 * means changing their mtu from timer context, which
3558 * is probably not a good idea.
3560 netdev_dbg(bond_dev, "err %d %s\n", res,
3566 bond_dev->mtu = new_mtu;
3571 /* unwind from head to the slave that failed */
3572 bond_for_each_slave(bond, rollback_slave, iter) {
3575 if (rollback_slave == slave)
3578 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3580 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3581 tmp_res, rollback_slave->dev->name);
3588 /* Change HW address
3590 * Note that many devices must be down to change the HW address, and
3591 * downing the master releases all slaves. We can make bonds full of
3592 * bonding devices to test this, however.
3594 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3596 struct bonding *bond = netdev_priv(bond_dev);
3597 struct slave *slave, *rollback_slave;
3598 struct sockaddr *sa = addr, tmp_sa;
3599 struct list_head *iter;
3602 if (BOND_MODE(bond) == BOND_MODE_ALB)
3603 return bond_alb_set_mac_address(bond_dev, addr);
3606 netdev_dbg(bond_dev, "bond=%p\n", bond);
3608 /* If fail_over_mac is enabled, do nothing and return success.
3609 * Returning an error causes ifenslave to fail.
3611 if (bond->params.fail_over_mac &&
3612 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3615 if (!is_valid_ether_addr(sa->sa_data))
3616 return -EADDRNOTAVAIL;
3618 bond_for_each_slave(bond, slave, iter) {
3619 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3620 res = dev_set_mac_address(slave->dev, addr);
3622 /* TODO: consider downing the slave
3624 * User should expect communications
3625 * breakage anyway until ARP finish
3628 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3634 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3638 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3639 tmp_sa.sa_family = bond_dev->type;
3641 /* unwind from head to the slave that failed */
3642 bond_for_each_slave(bond, rollback_slave, iter) {
3645 if (rollback_slave == slave)
3648 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3650 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3651 tmp_res, rollback_slave->dev->name);
3659 * bond_xmit_slave_id - transmit skb through slave with slave_id
3660 * @bond: bonding device that is transmitting
3661 * @skb: buffer to transmit
3662 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3664 * This function tries to transmit through slave with slave_id but in case
3665 * it fails, it tries to find the first available slave for transmission.
3666 * The skb is consumed in all cases, thus the function is void.
3668 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3670 struct list_head *iter;
3671 struct slave *slave;
3674 /* Here we start from the slave with slave_id */
3675 bond_for_each_slave_rcu(bond, slave, iter) {
3677 if (bond_slave_can_tx(slave)) {
3678 bond_dev_queue_xmit(bond, skb, slave->dev);
3684 /* Here we start from the first slave up to slave_id */
3686 bond_for_each_slave_rcu(bond, slave, iter) {
3689 if (bond_slave_can_tx(slave)) {
3690 bond_dev_queue_xmit(bond, skb, slave->dev);
3694 /* no slave that can tx has been found */
3695 bond_tx_drop(bond->dev, skb);
3699 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3700 * @bond: bonding device to use
3702 * Based on the value of the bonding device's packets_per_slave parameter
3703 * this function generates a slave id, which is usually used as the next
3704 * slave to transmit through.
3706 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3709 struct reciprocal_value reciprocal_packets_per_slave;
3710 int packets_per_slave = bond->params.packets_per_slave;
3712 switch (packets_per_slave) {
3714 slave_id = prandom_u32();
3717 slave_id = bond->rr_tx_counter;
3720 reciprocal_packets_per_slave =
3721 bond->params.reciprocal_packets_per_slave;
3722 slave_id = reciprocal_divide(bond->rr_tx_counter,
3723 reciprocal_packets_per_slave);
3726 bond->rr_tx_counter++;
3731 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3733 struct bonding *bond = netdev_priv(bond_dev);
3734 struct iphdr *iph = ip_hdr(skb);
3735 struct slave *slave;
3738 /* Start with the curr_active_slave that joined the bond as the
3739 * default for sending IGMP traffic. For failover purposes one
3740 * needs to maintain some consistency for the interface that will
3741 * send the join/membership reports. The curr_active_slave found
3742 * will send all of this type of traffic.
3744 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3745 slave = rcu_dereference(bond->curr_active_slave);
3747 bond_dev_queue_xmit(bond, skb, slave->dev);
3749 bond_xmit_slave_id(bond, skb, 0);
3751 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3753 if (likely(slave_cnt)) {
3754 slave_id = bond_rr_gen_slave_id(bond);
3755 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3757 bond_tx_drop(bond_dev, skb);
3761 return NETDEV_TX_OK;
3764 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3765 * the bond has a usable interface.
3767 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3769 struct bonding *bond = netdev_priv(bond_dev);
3770 struct slave *slave;
3772 slave = rcu_dereference(bond->curr_active_slave);
3774 bond_dev_queue_xmit(bond, skb, slave->dev);
3776 bond_tx_drop(bond_dev, skb);
3778 return NETDEV_TX_OK;
3781 /* Use this to update slave_array when (a) it's not appropriate to update
3782 * slave_array right away (note that update_slave_array() may sleep)
3783 * and / or (b) RTNL is not held.
3785 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3787 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3790 /* Slave array work handler. Holds only RTNL */
3791 static void bond_slave_arr_handler(struct work_struct *work)
3793 struct bonding *bond = container_of(work, struct bonding,
3794 slave_arr_work.work);
3797 if (!rtnl_trylock())
3800 ret = bond_update_slave_arr(bond, NULL);
3803 pr_warn_ratelimited("Failed to update slave array from WT\n");
3809 bond_slave_arr_work_rearm(bond, 1);
3812 /* Build the usable slaves array in control path for modes that use xmit-hash
3813 * to determine the slave interface -
3814 * (a) BOND_MODE_8023AD
3816 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3818 * The caller is expected to hold RTNL only and NO other lock!
3820 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3822 struct slave *slave;
3823 struct list_head *iter;
3824 struct bond_up_slave *new_arr, *old_arr;
3828 #ifdef CONFIG_LOCKDEP
3829 WARN_ON(lockdep_is_held(&bond->mode_lock));
3832 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3836 pr_err("Failed to build slave-array.\n");
3839 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3840 struct ad_info ad_info;
3842 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3843 pr_debug("bond_3ad_get_active_agg_info failed\n");
3844 kfree_rcu(new_arr, rcu);
3845 /* No active aggragator means it's not safe to use
3846 * the previous array.
3848 old_arr = rtnl_dereference(bond->slave_arr);
3850 RCU_INIT_POINTER(bond->slave_arr, NULL);
3851 kfree_rcu(old_arr, rcu);
3855 agg_id = ad_info.aggregator_id;
3857 bond_for_each_slave(bond, slave, iter) {
3858 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3859 struct aggregator *agg;
3861 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3862 if (!agg || agg->aggregator_identifier != agg_id)
3865 if (!bond_slave_can_tx(slave))
3867 if (skipslave == slave)
3869 new_arr->arr[new_arr->count++] = slave;
3872 old_arr = rtnl_dereference(bond->slave_arr);
3873 rcu_assign_pointer(bond->slave_arr, new_arr);
3875 kfree_rcu(old_arr, rcu);
3877 if (ret != 0 && skipslave) {
3880 /* Rare situation where caller has asked to skip a specific
3881 * slave but allocation failed (most likely!). BTW this is
3882 * only possible when the call is initiated from
3883 * __bond_release_one(). In this situation; overwrite the
3884 * skipslave entry in the array with the last entry from the
3885 * array to avoid a situation where the xmit path may choose
3886 * this to-be-skipped slave to send a packet out.
3888 old_arr = rtnl_dereference(bond->slave_arr);
3889 for (idx = 0; idx < old_arr->count; idx++) {
3890 if (skipslave == old_arr->arr[idx]) {
3892 old_arr->arr[old_arr->count-1];
3901 /* Use this Xmit function for 3AD as well as XOR modes. The current
3902 * usable slave array is formed in the control path. The xmit function
3903 * just calculates hash and sends the packet out.
3905 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3907 struct bonding *bond = netdev_priv(dev);
3908 struct slave *slave;
3909 struct bond_up_slave *slaves;
3912 slaves = rcu_dereference(bond->slave_arr);
3913 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3914 if (likely(count)) {
3915 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3916 bond_dev_queue_xmit(bond, skb, slave->dev);
3918 bond_tx_drop(dev, skb);
3921 return NETDEV_TX_OK;
3924 /* in broadcast mode, we send everything to all usable interfaces. */
3925 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3927 struct bonding *bond = netdev_priv(bond_dev);
3928 struct slave *slave = NULL;
3929 struct list_head *iter;
3931 bond_for_each_slave_rcu(bond, slave, iter) {
3932 if (bond_is_last_slave(bond, slave))
3934 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3935 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3938 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3939 bond_dev->name, __func__);
3942 bond_dev_queue_xmit(bond, skb2, slave->dev);
3945 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3946 bond_dev_queue_xmit(bond, skb, slave->dev);
3948 bond_tx_drop(bond_dev, skb);
3950 return NETDEV_TX_OK;
3953 /*------------------------- Device initialization ---------------------------*/
3955 /* Lookup the slave that corresponds to a qid */
3956 static inline int bond_slave_override(struct bonding *bond,
3957 struct sk_buff *skb)
3959 struct slave *slave = NULL;
3960 struct list_head *iter;
3962 if (!skb->queue_mapping)
3965 /* Find out if any slaves have the same mapping as this skb. */
3966 bond_for_each_slave_rcu(bond, slave, iter) {
3967 if (slave->queue_id == skb->queue_mapping) {
3968 if (bond_slave_is_up(slave) &&
3969 slave->link == BOND_LINK_UP) {
3970 bond_dev_queue_xmit(bond, skb, slave->dev);
3973 /* If the slave isn't UP, use default transmit policy. */
3982 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3983 void *accel_priv, select_queue_fallback_t fallback)
3985 /* This helper function exists to help dev_pick_tx get the correct
3986 * destination queue. Using a helper function skips a call to
3987 * skb_tx_hash and will put the skbs in the queue we expect on their
3988 * way down to the bonding driver.
3990 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3992 /* Save the original txq to restore before passing to the driver */
3993 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3995 if (unlikely(txq >= dev->real_num_tx_queues)) {
3997 txq -= dev->real_num_tx_queues;
3998 } while (txq >= dev->real_num_tx_queues);
4003 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4005 struct bonding *bond = netdev_priv(dev);
4007 if (bond_should_override_tx_queue(bond) &&
4008 !bond_slave_override(bond, skb))
4009 return NETDEV_TX_OK;
4011 switch (BOND_MODE(bond)) {
4012 case BOND_MODE_ROUNDROBIN:
4013 return bond_xmit_roundrobin(skb, dev);
4014 case BOND_MODE_ACTIVEBACKUP:
4015 return bond_xmit_activebackup(skb, dev);
4016 case BOND_MODE_8023AD:
4018 return bond_3ad_xor_xmit(skb, dev);
4019 case BOND_MODE_BROADCAST:
4020 return bond_xmit_broadcast(skb, dev);
4022 return bond_alb_xmit(skb, dev);
4024 return bond_tlb_xmit(skb, dev);
4026 /* Should never happen, mode already checked */
4027 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4029 bond_tx_drop(dev, skb);
4030 return NETDEV_TX_OK;
4034 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4036 struct bonding *bond = netdev_priv(dev);
4037 netdev_tx_t ret = NETDEV_TX_OK;
4039 /* If we risk deadlock from transmitting this in the
4040 * netpoll path, tell netpoll to queue the frame for later tx
4042 if (unlikely(is_netpoll_tx_blocked(dev)))
4043 return NETDEV_TX_BUSY;
4046 if (bond_has_slaves(bond))
4047 ret = __bond_start_xmit(skb, dev);
4049 bond_tx_drop(dev, skb);
4055 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4056 struct ethtool_cmd *ecmd)
4058 struct bonding *bond = netdev_priv(bond_dev);
4059 unsigned long speed = 0;
4060 struct list_head *iter;
4061 struct slave *slave;
4063 ecmd->duplex = DUPLEX_UNKNOWN;
4064 ecmd->port = PORT_OTHER;
4066 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4067 * do not need to check mode. Though link speed might not represent
4068 * the true receive or transmit bandwidth (not all modes are symmetric)
4069 * this is an accurate maximum.
4071 bond_for_each_slave(bond, slave, iter) {
4072 if (bond_slave_can_tx(slave)) {
4073 if (slave->speed != SPEED_UNKNOWN)
4074 speed += slave->speed;
4075 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4076 slave->duplex != DUPLEX_UNKNOWN)
4077 ecmd->duplex = slave->duplex;
4080 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4085 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4086 struct ethtool_drvinfo *drvinfo)
4088 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4089 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4090 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4094 static const struct ethtool_ops bond_ethtool_ops = {
4095 .get_drvinfo = bond_ethtool_get_drvinfo,
4096 .get_settings = bond_ethtool_get_settings,
4097 .get_link = ethtool_op_get_link,
4100 static const struct net_device_ops bond_netdev_ops = {
4101 .ndo_init = bond_init,
4102 .ndo_uninit = bond_uninit,
4103 .ndo_open = bond_open,
4104 .ndo_stop = bond_close,
4105 .ndo_start_xmit = bond_start_xmit,
4106 .ndo_select_queue = bond_select_queue,
4107 .ndo_get_stats64 = bond_get_stats,
4108 .ndo_do_ioctl = bond_do_ioctl,
4109 .ndo_change_rx_flags = bond_change_rx_flags,
4110 .ndo_set_rx_mode = bond_set_rx_mode,
4111 .ndo_change_mtu = bond_change_mtu,
4112 .ndo_set_mac_address = bond_set_mac_address,
4113 .ndo_neigh_setup = bond_neigh_setup,
4114 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4115 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4116 #ifdef CONFIG_NET_POLL_CONTROLLER
4117 .ndo_netpoll_setup = bond_netpoll_setup,
4118 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4119 .ndo_poll_controller = bond_poll_controller,
4121 .ndo_add_slave = bond_enslave,
4122 .ndo_del_slave = bond_release,
4123 .ndo_fix_features = bond_fix_features,
4124 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4125 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4126 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4127 .ndo_fdb_add = switchdev_port_fdb_add,
4128 .ndo_fdb_del = switchdev_port_fdb_del,
4129 .ndo_fdb_dump = switchdev_port_fdb_dump,
4130 .ndo_features_check = passthru_features_check,
4133 static const struct device_type bond_type = {
4137 static void bond_destructor(struct net_device *bond_dev)
4139 struct bonding *bond = netdev_priv(bond_dev);
4141 destroy_workqueue(bond->wq);
4142 free_netdev(bond_dev);
4145 void bond_setup(struct net_device *bond_dev)
4147 struct bonding *bond = netdev_priv(bond_dev);
4149 spin_lock_init(&bond->mode_lock);
4150 bond->params = bonding_defaults;
4152 /* Initialize pointers */
4153 bond->dev = bond_dev;
4155 /* Initialize the device entry points */
4156 ether_setup(bond_dev);
4157 bond_dev->netdev_ops = &bond_netdev_ops;
4158 bond_dev->ethtool_ops = &bond_ethtool_ops;
4160 bond_dev->destructor = bond_destructor;
4162 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4164 /* Initialize the device options */
4165 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4166 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4167 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4169 /* don't acquire bond device's netif_tx_lock when transmitting */
4170 bond_dev->features |= NETIF_F_LLTX;
4172 /* By default, we declare the bond to be fully
4173 * VLAN hardware accelerated capable. Special
4174 * care is taken in the various xmit functions
4175 * when there are slaves that are not hw accel
4179 /* Don't allow bond devices to change network namespaces. */
4180 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4182 bond_dev->hw_features = BOND_VLAN_FEATURES |
4183 NETIF_F_HW_VLAN_CTAG_TX |
4184 NETIF_F_HW_VLAN_CTAG_RX |
4185 NETIF_F_HW_VLAN_CTAG_FILTER;
4187 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4188 bond_dev->features |= bond_dev->hw_features;
4191 /* Destroy a bonding device.
4192 * Must be under rtnl_lock when this function is called.
4194 static void bond_uninit(struct net_device *bond_dev)
4196 struct bonding *bond = netdev_priv(bond_dev);
4197 struct list_head *iter;
4198 struct slave *slave;
4199 struct bond_up_slave *arr;
4201 bond_netpoll_cleanup(bond_dev);
4203 /* Release the bonded slaves */
4204 bond_for_each_slave(bond, slave, iter)
4205 __bond_release_one(bond_dev, slave->dev, true);
4206 netdev_info(bond_dev, "Released all slaves\n");
4208 arr = rtnl_dereference(bond->slave_arr);
4210 RCU_INIT_POINTER(bond->slave_arr, NULL);
4211 kfree_rcu(arr, rcu);
4214 list_del(&bond->bond_list);
4216 bond_debug_unregister(bond);
4219 /*------------------------- Module initialization ---------------------------*/
4221 static int bond_check_params(struct bond_params *params)
4223 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4224 struct bond_opt_value newval;
4225 const struct bond_opt_value *valptr;
4226 int arp_all_targets_value;
4227 u16 ad_actor_sys_prio = 0;
4228 u16 ad_user_port_key = 0;
4230 /* Convert string parameters. */
4232 bond_opt_initstr(&newval, mode);
4233 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4235 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4238 bond_mode = valptr->value;
4241 if (xmit_hash_policy) {
4242 if ((bond_mode != BOND_MODE_XOR) &&
4243 (bond_mode != BOND_MODE_8023AD) &&
4244 (bond_mode != BOND_MODE_TLB)) {
4245 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4246 bond_mode_name(bond_mode));
4248 bond_opt_initstr(&newval, xmit_hash_policy);
4249 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4252 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4256 xmit_hashtype = valptr->value;
4261 if (bond_mode != BOND_MODE_8023AD) {
4262 pr_info("lacp_rate param is irrelevant in mode %s\n",
4263 bond_mode_name(bond_mode));
4265 bond_opt_initstr(&newval, lacp_rate);
4266 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4269 pr_err("Error: Invalid lacp rate \"%s\"\n",
4273 lacp_fast = valptr->value;
4278 bond_opt_initstr(&newval, ad_select);
4279 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4282 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4285 params->ad_select = valptr->value;
4286 if (bond_mode != BOND_MODE_8023AD)
4287 pr_warn("ad_select param only affects 802.3ad mode\n");
4289 params->ad_select = BOND_AD_STABLE;
4292 if (max_bonds < 0) {
4293 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4294 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4295 max_bonds = BOND_DEFAULT_MAX_BONDS;
4299 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4305 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4310 if (downdelay < 0) {
4311 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4312 downdelay, INT_MAX);
4316 if ((use_carrier != 0) && (use_carrier != 1)) {
4317 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4322 if (num_peer_notif < 0 || num_peer_notif > 255) {
4323 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4328 /* reset values for 802.3ad/TLB/ALB */
4329 if (!bond_mode_uses_arp(bond_mode)) {
4331 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");
4332 pr_warn("Forcing miimon to 100msec\n");
4333 miimon = BOND_DEFAULT_MIIMON;
4337 if (tx_queues < 1 || tx_queues > 255) {
4338 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4339 tx_queues, BOND_DEFAULT_TX_QUEUES);
4340 tx_queues = BOND_DEFAULT_TX_QUEUES;
4343 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4344 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4346 all_slaves_active = 0;
4349 if (resend_igmp < 0 || resend_igmp > 255) {
4350 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4351 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4352 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4355 bond_opt_initval(&newval, packets_per_slave);
4356 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4357 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4358 packets_per_slave, USHRT_MAX);
4359 packets_per_slave = 1;
4362 if (bond_mode == BOND_MODE_ALB) {
4363 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",
4368 if (updelay || downdelay) {
4369 /* just warn the user the up/down delay will have
4370 * no effect since miimon is zero...
4372 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",
4373 updelay, downdelay);
4376 /* don't allow arp monitoring */
4378 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4379 miimon, arp_interval);
4383 if ((updelay % miimon) != 0) {
4384 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4385 updelay, miimon, (updelay / miimon) * miimon);
4390 if ((downdelay % miimon) != 0) {
4391 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4393 (downdelay / miimon) * miimon);
4396 downdelay /= miimon;
4399 if (arp_interval < 0) {
4400 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4401 arp_interval, INT_MAX);
4405 for (arp_ip_count = 0, i = 0;
4406 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4409 /* not a complete check, but good enough to catch mistakes */
4410 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4411 !bond_is_ip_target_ok(ip)) {
4412 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4416 if (bond_get_targets_ip(arp_target, ip) == -1)
4417 arp_target[arp_ip_count++] = ip;
4419 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4424 if (arp_interval && !arp_ip_count) {
4425 /* don't allow arping if no arp_ip_target given... */
4426 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4432 if (!arp_interval) {
4433 pr_err("arp_validate requires arp_interval\n");
4437 bond_opt_initstr(&newval, arp_validate);
4438 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4441 pr_err("Error: invalid arp_validate \"%s\"\n",
4445 arp_validate_value = valptr->value;
4447 arp_validate_value = 0;
4450 arp_all_targets_value = 0;
4451 if (arp_all_targets) {
4452 bond_opt_initstr(&newval, arp_all_targets);
4453 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4456 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4458 arp_all_targets_value = 0;
4460 arp_all_targets_value = valptr->value;
4465 pr_info("MII link monitoring set to %d ms\n", miimon);
4466 } else if (arp_interval) {
4467 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4468 arp_validate_value);
4469 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4470 arp_interval, valptr->string, arp_ip_count);
4472 for (i = 0; i < arp_ip_count; i++)
4473 pr_cont(" %s", arp_ip_target[i]);
4477 } else if (max_bonds) {
4478 /* miimon and arp_interval not set, we need one so things
4479 * work as expected, see bonding.txt for details
4481 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");
4484 if (primary && !bond_mode_uses_primary(bond_mode)) {
4485 /* currently, using a primary only makes sense
4486 * in active backup, TLB or ALB modes
4488 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4489 primary, bond_mode_name(bond_mode));
4493 if (primary && primary_reselect) {
4494 bond_opt_initstr(&newval, primary_reselect);
4495 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4498 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4502 primary_reselect_value = valptr->value;
4504 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4507 if (fail_over_mac) {
4508 bond_opt_initstr(&newval, fail_over_mac);
4509 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4512 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4516 fail_over_mac_value = valptr->value;
4517 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4518 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4520 fail_over_mac_value = BOND_FOM_NONE;
4523 bond_opt_initstr(&newval, "default");
4524 valptr = bond_opt_parse(
4525 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4528 pr_err("Error: No ad_actor_sys_prio default value");
4531 ad_actor_sys_prio = valptr->value;
4533 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4536 pr_err("Error: No ad_user_port_key default value");
4539 ad_user_port_key = valptr->value;
4541 if (lp_interval == 0) {
4542 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4543 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4544 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4547 /* fill params struct with the proper values */
4548 params->mode = bond_mode;
4549 params->xmit_policy = xmit_hashtype;
4550 params->miimon = miimon;
4551 params->num_peer_notif = num_peer_notif;
4552 params->arp_interval = arp_interval;
4553 params->arp_validate = arp_validate_value;
4554 params->arp_all_targets = arp_all_targets_value;
4555 params->updelay = updelay;
4556 params->downdelay = downdelay;
4557 params->use_carrier = use_carrier;
4558 params->lacp_fast = lacp_fast;
4559 params->primary[0] = 0;
4560 params->primary_reselect = primary_reselect_value;
4561 params->fail_over_mac = fail_over_mac_value;
4562 params->tx_queues = tx_queues;
4563 params->all_slaves_active = all_slaves_active;
4564 params->resend_igmp = resend_igmp;
4565 params->min_links = min_links;
4566 params->lp_interval = lp_interval;
4567 params->packets_per_slave = packets_per_slave;
4568 params->tlb_dynamic_lb = 1; /* Default value */
4569 params->ad_actor_sys_prio = ad_actor_sys_prio;
4570 eth_zero_addr(params->ad_actor_system);
4571 params->ad_user_port_key = ad_user_port_key;
4572 if (packets_per_slave > 0) {
4573 params->reciprocal_packets_per_slave =
4574 reciprocal_value(packets_per_slave);
4576 /* reciprocal_packets_per_slave is unused if
4577 * packets_per_slave is 0 or 1, just initialize it
4579 params->reciprocal_packets_per_slave =
4580 (struct reciprocal_value) { 0 };
4584 strncpy(params->primary, primary, IFNAMSIZ);
4585 params->primary[IFNAMSIZ - 1] = 0;
4588 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4593 static struct lock_class_key bonding_netdev_xmit_lock_key;
4594 static struct lock_class_key bonding_netdev_addr_lock_key;
4595 static struct lock_class_key bonding_tx_busylock_key;
4597 static void bond_set_lockdep_class_one(struct net_device *dev,
4598 struct netdev_queue *txq,
4601 lockdep_set_class(&txq->_xmit_lock,
4602 &bonding_netdev_xmit_lock_key);
4605 static void bond_set_lockdep_class(struct net_device *dev)
4607 lockdep_set_class(&dev->addr_list_lock,
4608 &bonding_netdev_addr_lock_key);
4609 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4610 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4613 /* Called from registration process */
4614 static int bond_init(struct net_device *bond_dev)
4616 struct bonding *bond = netdev_priv(bond_dev);
4617 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4619 netdev_dbg(bond_dev, "Begin bond_init\n");
4621 bond->wq = create_singlethread_workqueue(bond_dev->name);
4625 bond_set_lockdep_class(bond_dev);
4627 list_add_tail(&bond->bond_list, &bn->dev_list);
4629 bond_prepare_sysfs_group(bond);
4631 bond_debug_register(bond);
4633 /* Ensure valid dev_addr */
4634 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4635 bond_dev->addr_assign_type == NET_ADDR_PERM)
4636 eth_hw_addr_random(bond_dev);
4641 unsigned int bond_get_num_tx_queues(void)
4646 /* Create a new bond based on the specified name and bonding parameters.
4647 * If name is NULL, obtain a suitable "bond%d" name for us.
4648 * Caller must NOT hold rtnl_lock; we need to release it here before we
4649 * set up our sysfs entries.
4651 int bond_create(struct net *net, const char *name)
4653 struct net_device *bond_dev;
4654 struct bonding *bond;
4655 struct alb_bond_info *bond_info;
4660 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4661 name ? name : "bond%d", NET_NAME_UNKNOWN,
4662 bond_setup, tx_queues);
4664 pr_err("%s: eek! can't alloc netdev!\n", name);
4670 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4671 * It is set to 0 by default which is wrong.
4673 bond = netdev_priv(bond_dev);
4674 bond_info = &(BOND_ALB_INFO(bond));
4675 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4677 dev_net_set(bond_dev, net);
4678 bond_dev->rtnl_link_ops = &bond_link_ops;
4680 res = register_netdevice(bond_dev);
4682 netif_carrier_off(bond_dev);
4686 bond_destructor(bond_dev);
4690 static int __net_init bond_net_init(struct net *net)
4692 struct bond_net *bn = net_generic(net, bond_net_id);
4695 INIT_LIST_HEAD(&bn->dev_list);
4697 bond_create_proc_dir(bn);
4698 bond_create_sysfs(bn);
4703 static void __net_exit bond_net_exit(struct net *net)
4705 struct bond_net *bn = net_generic(net, bond_net_id);
4706 struct bonding *bond, *tmp_bond;
4709 bond_destroy_sysfs(bn);
4711 /* Kill off any bonds created after unregistering bond rtnl ops */
4713 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4714 unregister_netdevice_queue(bond->dev, &list);
4715 unregister_netdevice_many(&list);
4718 bond_destroy_proc_dir(bn);
4721 static struct pernet_operations bond_net_ops = {
4722 .init = bond_net_init,
4723 .exit = bond_net_exit,
4725 .size = sizeof(struct bond_net),
4728 static int __init bonding_init(void)
4733 pr_info("%s", bond_version);
4735 res = bond_check_params(&bonding_defaults);
4739 res = register_pernet_subsys(&bond_net_ops);
4743 res = bond_netlink_init();
4747 bond_create_debugfs();
4749 for (i = 0; i < max_bonds; i++) {
4750 res = bond_create(&init_net, NULL);
4755 register_netdevice_notifier(&bond_netdev_notifier);
4759 bond_destroy_debugfs();
4760 bond_netlink_fini();
4762 unregister_pernet_subsys(&bond_net_ops);
4767 static void __exit bonding_exit(void)
4769 unregister_netdevice_notifier(&bond_netdev_notifier);
4771 bond_destroy_debugfs();
4773 bond_netlink_fini();
4774 unregister_pernet_subsys(&bond_net_ops);
4776 #ifdef CONFIG_NET_POLL_CONTROLLER
4777 /* Make sure we don't have an imbalance on our netpoll blocking */
4778 WARN_ON(atomic_read(&netpoll_block_tx));
4782 module_init(bonding_init);
4783 module_exit(bonding_exit);
4784 MODULE_LICENSE("GPL");
4785 MODULE_VERSION(DRV_VERSION);
4786 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4787 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");