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
, "802.3ad 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
);
217 static bool bond_time_in_interval(struct bonding
*bond
, unsigned long last_act
,
220 /*---------------------------- General routines -----------------------------*/
222 const char *bond_mode_name(int mode
)
224 static const char *names
[] = {
225 [BOND_MODE_ROUNDROBIN
] = "load balancing (round-robin)",
226 [BOND_MODE_ACTIVEBACKUP
] = "fault-tolerance (active-backup)",
227 [BOND_MODE_XOR
] = "load balancing (xor)",
228 [BOND_MODE_BROADCAST
] = "fault-tolerance (broadcast)",
229 [BOND_MODE_8023AD
] = "IEEE 802.3ad Dynamic link aggregation",
230 [BOND_MODE_TLB
] = "transmit load balancing",
231 [BOND_MODE_ALB
] = "adaptive load balancing",
234 if (mode
< BOND_MODE_ROUNDROBIN
|| mode
> BOND_MODE_ALB
)
240 /*---------------------------------- VLAN -----------------------------------*/
243 * bond_dev_queue_xmit - Prepare skb for xmit.
245 * @bond: bond device that got this skb for tx.
246 * @skb: hw accel VLAN tagged skb to transmit
247 * @slave_dev: slave that is supposed to xmit this skbuff
249 void bond_dev_queue_xmit(struct bonding
*bond
, struct sk_buff
*skb
,
250 struct net_device
*slave_dev
)
252 skb
->dev
= slave_dev
;
254 BUILD_BUG_ON(sizeof(skb
->queue_mapping
) !=
255 sizeof(qdisc_skb_cb(skb
)->slave_dev_queue_mapping
));
256 skb
->queue_mapping
= qdisc_skb_cb(skb
)->slave_dev_queue_mapping
;
258 if (unlikely(netpoll_tx_running(bond
->dev
)))
259 bond_netpoll_send_skb(bond_get_slave_by_dev(bond
, slave_dev
), skb
);
264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
265 * We don't protect the slave list iteration with a lock because:
266 * a. This operation is performed in IOCTL context,
267 * b. The operation is protected by the RTNL semaphore in the 8021q code,
268 * c. Holding a lock with BH disabled while directly calling a base driver
269 * entry point is generally a BAD idea.
271 * The design of synchronization/protection for this operation in the 8021q
272 * module is good for one or more VLAN devices over a single physical device
273 * and cannot be extended for a teaming solution like bonding, so there is a
274 * potential race condition here where a net device from the vlan group might
275 * be referenced (either by a base driver or the 8021q code) while it is being
276 * removed from the system. However, it turns out we're not making matters
277 * worse, and if it works for regular VLAN usage it will work here too.
281 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
282 * @bond_dev: bonding net device that got called
283 * @vid: vlan id being added
285 static int bond_vlan_rx_add_vid(struct net_device
*bond_dev
,
286 __be16 proto
, u16 vid
)
288 struct bonding
*bond
= netdev_priv(bond_dev
);
289 struct slave
*slave
, *rollback_slave
;
290 struct list_head
*iter
;
293 bond_for_each_slave(bond
, slave
, iter
) {
294 res
= vlan_vid_add(slave
->dev
, proto
, vid
);
302 /* unwind to the slave that failed */
303 bond_for_each_slave(bond
, rollback_slave
, iter
) {
304 if (rollback_slave
== slave
)
307 vlan_vid_del(rollback_slave
->dev
, proto
, vid
);
314 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
315 * @bond_dev: bonding net device that got called
316 * @vid: vlan id being removed
318 static int bond_vlan_rx_kill_vid(struct net_device
*bond_dev
,
319 __be16 proto
, u16 vid
)
321 struct bonding
*bond
= netdev_priv(bond_dev
);
322 struct list_head
*iter
;
325 bond_for_each_slave(bond
, slave
, iter
)
326 vlan_vid_del(slave
->dev
, proto
, vid
);
328 if (bond_is_lb(bond
))
329 bond_alb_clear_vlan(bond
, vid
);
334 /*------------------------------- Link status -------------------------------*/
336 /* Set the carrier state for the master according to the state of its
337 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
338 * do special 802.3ad magic.
340 * Returns zero if carrier state does not change, nonzero if it does.
342 int bond_set_carrier(struct bonding
*bond
)
344 struct list_head
*iter
;
347 if (!bond_has_slaves(bond
))
350 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
351 return bond_3ad_set_carrier(bond
);
353 bond_for_each_slave(bond
, slave
, iter
) {
354 if (slave
->link
== BOND_LINK_UP
) {
355 if (!netif_carrier_ok(bond
->dev
)) {
356 netif_carrier_on(bond
->dev
);
364 if (netif_carrier_ok(bond
->dev
)) {
365 netif_carrier_off(bond
->dev
);
371 /* Get link speed and duplex from the slave's base driver
372 * using ethtool. If for some reason the call fails or the
373 * values are invalid, set speed and duplex to -1,
374 * and return. Return 1 if speed or duplex settings are
375 * UNKNOWN; 0 otherwise.
377 static int bond_update_speed_duplex(struct slave
*slave
)
379 struct net_device
*slave_dev
= slave
->dev
;
380 struct ethtool_link_ksettings ecmd
;
383 slave
->speed
= SPEED_UNKNOWN
;
384 slave
->duplex
= DUPLEX_UNKNOWN
;
386 res
= __ethtool_get_link_ksettings(slave_dev
, &ecmd
);
388 slave
->link
= BOND_LINK_DOWN
;
391 if (ecmd
.base
.speed
== 0 || ecmd
.base
.speed
== ((__u32
)-1)) {
392 slave
->link
= BOND_LINK_DOWN
;
395 switch (ecmd
.base
.duplex
) {
400 slave
->link
= BOND_LINK_DOWN
;
404 slave
->speed
= ecmd
.base
.speed
;
405 slave
->duplex
= ecmd
.base
.duplex
;
410 const char *bond_slave_link_status(s8 link
)
426 /* if <dev> supports MII link status reporting, check its link status.
428 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
429 * depending upon the setting of the use_carrier parameter.
431 * Return either BMSR_LSTATUS, meaning that the link is up (or we
432 * can't tell and just pretend it is), or 0, meaning that the link is
435 * If reporting is non-zero, instead of faking link up, return -1 if
436 * both ETHTOOL and MII ioctls fail (meaning the device does not
437 * support them). If use_carrier is set, return whatever it says.
438 * It'd be nice if there was a good way to tell if a driver supports
439 * netif_carrier, but there really isn't.
441 static int bond_check_dev_link(struct bonding
*bond
,
442 struct net_device
*slave_dev
, int reporting
)
444 const struct net_device_ops
*slave_ops
= slave_dev
->netdev_ops
;
445 int (*ioctl
)(struct net_device
*, struct ifreq
*, int);
447 struct mii_ioctl_data
*mii
;
449 if (!reporting
&& !netif_running(slave_dev
))
452 if (bond
->params
.use_carrier
)
453 return netif_carrier_ok(slave_dev
) ? BMSR_LSTATUS
: 0;
455 /* Try to get link status using Ethtool first. */
456 if (slave_dev
->ethtool_ops
->get_link
)
457 return slave_dev
->ethtool_ops
->get_link(slave_dev
) ?
460 /* Ethtool can't be used, fallback to MII ioctls. */
461 ioctl
= slave_ops
->ndo_do_ioctl
;
463 /* TODO: set pointer to correct ioctl on a per team member
464 * bases to make this more efficient. that is, once
465 * we determine the correct ioctl, we will always
466 * call it and not the others for that team
470 /* We cannot assume that SIOCGMIIPHY will also read a
471 * register; not all network drivers (e.g., e100)
475 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
476 strncpy(ifr
.ifr_name
, slave_dev
->name
, IFNAMSIZ
);
478 if (ioctl(slave_dev
, &ifr
, SIOCGMIIPHY
) == 0) {
479 mii
->reg_num
= MII_BMSR
;
480 if (ioctl(slave_dev
, &ifr
, SIOCGMIIREG
) == 0)
481 return mii
->val_out
& BMSR_LSTATUS
;
485 /* If reporting, report that either there's no dev->do_ioctl,
486 * or both SIOCGMIIREG and get_link failed (meaning that we
487 * cannot report link status). If not reporting, pretend
490 return reporting
? -1 : BMSR_LSTATUS
;
493 /*----------------------------- Multicast list ------------------------------*/
495 /* Push the promiscuity flag down to appropriate slaves */
496 static int bond_set_promiscuity(struct bonding
*bond
, int inc
)
498 struct list_head
*iter
;
501 if (bond_uses_primary(bond
)) {
502 struct slave
*curr_active
= rtnl_dereference(bond
->curr_active_slave
);
505 err
= dev_set_promiscuity(curr_active
->dev
, inc
);
509 bond_for_each_slave(bond
, slave
, iter
) {
510 err
= dev_set_promiscuity(slave
->dev
, inc
);
518 /* Push the allmulti flag down to all slaves */
519 static int bond_set_allmulti(struct bonding
*bond
, int inc
)
521 struct list_head
*iter
;
524 if (bond_uses_primary(bond
)) {
525 struct slave
*curr_active
= rtnl_dereference(bond
->curr_active_slave
);
528 err
= dev_set_allmulti(curr_active
->dev
, inc
);
532 bond_for_each_slave(bond
, slave
, iter
) {
533 err
= dev_set_allmulti(slave
->dev
, inc
);
541 /* Retrieve the list of registered multicast addresses for the bonding
542 * device and retransmit an IGMP JOIN request to the current active
545 static void bond_resend_igmp_join_requests_delayed(struct work_struct
*work
)
547 struct bonding
*bond
= container_of(work
, struct bonding
,
550 if (!rtnl_trylock()) {
551 queue_delayed_work(bond
->wq
, &bond
->mcast_work
, 1);
554 call_netdevice_notifiers(NETDEV_RESEND_IGMP
, bond
->dev
);
556 if (bond
->igmp_retrans
> 1) {
557 bond
->igmp_retrans
--;
558 queue_delayed_work(bond
->wq
, &bond
->mcast_work
, HZ
/5);
563 /* Flush bond's hardware addresses from slave */
564 static void bond_hw_addr_flush(struct net_device
*bond_dev
,
565 struct net_device
*slave_dev
)
567 struct bonding
*bond
= netdev_priv(bond_dev
);
569 dev_uc_unsync(slave_dev
, bond_dev
);
570 dev_mc_unsync(slave_dev
, bond_dev
);
572 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
573 /* del lacpdu mc addr from mc list */
574 u8 lacpdu_multicast
[ETH_ALEN
] = MULTICAST_LACPDU_ADDR
;
576 dev_mc_del(slave_dev
, lacpdu_multicast
);
580 /*--------------------------- Active slave change ---------------------------*/
582 /* Update the hardware address list and promisc/allmulti for the new and
583 * old active slaves (if any). Modes that are not using primary keep all
584 * slaves up date at all times; only the modes that use primary need to call
585 * this function to swap these settings during a failover.
587 static void bond_hw_addr_swap(struct bonding
*bond
, struct slave
*new_active
,
588 struct slave
*old_active
)
591 if (bond
->dev
->flags
& IFF_PROMISC
)
592 dev_set_promiscuity(old_active
->dev
, -1);
594 if (bond
->dev
->flags
& IFF_ALLMULTI
)
595 dev_set_allmulti(old_active
->dev
, -1);
597 bond_hw_addr_flush(bond
->dev
, old_active
->dev
);
601 /* FIXME: Signal errors upstream. */
602 if (bond
->dev
->flags
& IFF_PROMISC
)
603 dev_set_promiscuity(new_active
->dev
, 1);
605 if (bond
->dev
->flags
& IFF_ALLMULTI
)
606 dev_set_allmulti(new_active
->dev
, 1);
608 netif_addr_lock_bh(bond
->dev
);
609 dev_uc_sync(new_active
->dev
, bond
->dev
);
610 dev_mc_sync(new_active
->dev
, bond
->dev
);
611 netif_addr_unlock_bh(bond
->dev
);
616 * bond_set_dev_addr - clone slave's address to bond
617 * @bond_dev: bond net device
618 * @slave_dev: slave net device
620 * Should be called with RTNL held.
622 static void bond_set_dev_addr(struct net_device
*bond_dev
,
623 struct net_device
*slave_dev
)
625 netdev_dbg(bond_dev
, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
626 bond_dev
, slave_dev
, slave_dev
->name
, slave_dev
->addr_len
);
627 memcpy(bond_dev
->dev_addr
, slave_dev
->dev_addr
, slave_dev
->addr_len
);
628 bond_dev
->addr_assign_type
= NET_ADDR_STOLEN
;
629 call_netdevice_notifiers(NETDEV_CHANGEADDR
, bond_dev
);
632 static struct slave
*bond_get_old_active(struct bonding
*bond
,
633 struct slave
*new_active
)
636 struct list_head
*iter
;
638 bond_for_each_slave(bond
, slave
, iter
) {
639 if (slave
== new_active
)
642 if (ether_addr_equal(bond
->dev
->dev_addr
, slave
->dev
->dev_addr
))
649 /* bond_do_fail_over_mac
651 * Perform special MAC address swapping for fail_over_mac settings
655 static void bond_do_fail_over_mac(struct bonding
*bond
,
656 struct slave
*new_active
,
657 struct slave
*old_active
)
659 u8 tmp_mac
[ETH_ALEN
];
660 struct sockaddr saddr
;
663 switch (bond
->params
.fail_over_mac
) {
664 case BOND_FOM_ACTIVE
:
666 bond_set_dev_addr(bond
->dev
, new_active
->dev
);
668 case BOND_FOM_FOLLOW
:
669 /* if new_active && old_active, swap them
670 * if just old_active, do nothing (going to no active slave)
671 * if just new_active, set new_active to bond's MAC
677 old_active
= bond_get_old_active(bond
, new_active
);
680 ether_addr_copy(tmp_mac
, new_active
->dev
->dev_addr
);
681 ether_addr_copy(saddr
.sa_data
,
682 old_active
->dev
->dev_addr
);
683 saddr
.sa_family
= new_active
->dev
->type
;
685 ether_addr_copy(saddr
.sa_data
, bond
->dev
->dev_addr
);
686 saddr
.sa_family
= bond
->dev
->type
;
689 rv
= dev_set_mac_address(new_active
->dev
, &saddr
);
691 netdev_err(bond
->dev
, "Error %d setting MAC of slave %s\n",
692 -rv
, new_active
->dev
->name
);
699 ether_addr_copy(saddr
.sa_data
, tmp_mac
);
700 saddr
.sa_family
= old_active
->dev
->type
;
702 rv
= dev_set_mac_address(old_active
->dev
, &saddr
);
704 netdev_err(bond
->dev
, "Error %d setting MAC of slave %s\n",
705 -rv
, new_active
->dev
->name
);
709 netdev_err(bond
->dev
, "bond_do_fail_over_mac impossible: bad policy %d\n",
710 bond
->params
.fail_over_mac
);
716 static struct slave
*bond_choose_primary_or_current(struct bonding
*bond
)
718 struct slave
*prim
= rtnl_dereference(bond
->primary_slave
);
719 struct slave
*curr
= rtnl_dereference(bond
->curr_active_slave
);
721 if (!prim
|| prim
->link
!= BOND_LINK_UP
) {
722 if (!curr
|| curr
->link
!= BOND_LINK_UP
)
727 if (bond
->force_primary
) {
728 bond
->force_primary
= false;
732 if (!curr
|| curr
->link
!= BOND_LINK_UP
)
735 /* At this point, prim and curr are both up */
736 switch (bond
->params
.primary_reselect
) {
737 case BOND_PRI_RESELECT_ALWAYS
:
739 case BOND_PRI_RESELECT_BETTER
:
740 if (prim
->speed
< curr
->speed
)
742 if (prim
->speed
== curr
->speed
&& prim
->duplex
<= curr
->duplex
)
745 case BOND_PRI_RESELECT_FAILURE
:
748 netdev_err(bond
->dev
, "impossible primary_reselect %d\n",
749 bond
->params
.primary_reselect
);
755 * bond_find_best_slave - select the best available slave to be the active one
756 * @bond: our bonding struct
758 static struct slave
*bond_find_best_slave(struct bonding
*bond
)
760 struct slave
*slave
, *bestslave
= NULL
;
761 struct list_head
*iter
;
762 int mintime
= bond
->params
.updelay
;
764 slave
= bond_choose_primary_or_current(bond
);
768 bond_for_each_slave(bond
, slave
, iter
) {
769 if (slave
->link
== BOND_LINK_UP
)
771 if (slave
->link
== BOND_LINK_BACK
&& bond_slave_is_up(slave
) &&
772 slave
->delay
< mintime
) {
773 mintime
= slave
->delay
;
781 static bool bond_should_notify_peers(struct bonding
*bond
)
786 slave
= rcu_dereference(bond
->curr_active_slave
);
789 netdev_dbg(bond
->dev
, "bond_should_notify_peers: slave %s\n",
790 slave
? slave
->dev
->name
: "NULL");
792 if (!slave
|| !bond
->send_peer_notif
||
793 !netif_carrier_ok(bond
->dev
) ||
794 test_bit(__LINK_STATE_LINKWATCH_PENDING
, &slave
->dev
->state
))
801 * change_active_interface - change the active slave into the specified one
802 * @bond: our bonding struct
803 * @new: the new slave to make the active one
805 * Set the new slave to the bond's settings and unset them on the old
807 * Setting include flags, mc-list, promiscuity, allmulti, etc.
809 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
810 * because it is apparently the best available slave we have, even though its
811 * updelay hasn't timed out yet.
813 * Caller must hold RTNL.
815 void bond_change_active_slave(struct bonding
*bond
, struct slave
*new_active
)
817 struct slave
*old_active
;
821 old_active
= rtnl_dereference(bond
->curr_active_slave
);
823 if (old_active
== new_active
)
827 new_active
->last_link_up
= jiffies
;
829 if (new_active
->link
== BOND_LINK_BACK
) {
830 if (bond_uses_primary(bond
)) {
831 netdev_info(bond
->dev
, "making interface %s the new active one %d ms earlier\n",
832 new_active
->dev
->name
,
833 (bond
->params
.updelay
- new_active
->delay
) * bond
->params
.miimon
);
836 new_active
->delay
= 0;
837 bond_set_slave_link_state(new_active
, BOND_LINK_UP
,
838 BOND_SLAVE_NOTIFY_NOW
);
840 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
841 bond_3ad_handle_link_change(new_active
, BOND_LINK_UP
);
843 if (bond_is_lb(bond
))
844 bond_alb_handle_link_change(bond
, new_active
, BOND_LINK_UP
);
846 if (bond_uses_primary(bond
)) {
847 netdev_info(bond
->dev
, "making interface %s the new active one\n",
848 new_active
->dev
->name
);
853 if (bond_uses_primary(bond
))
854 bond_hw_addr_swap(bond
, new_active
, old_active
);
856 if (bond_is_lb(bond
)) {
857 bond_alb_handle_active_change(bond
, new_active
);
859 bond_set_slave_inactive_flags(old_active
,
860 BOND_SLAVE_NOTIFY_NOW
);
862 bond_set_slave_active_flags(new_active
,
863 BOND_SLAVE_NOTIFY_NOW
);
865 rcu_assign_pointer(bond
->curr_active_slave
, new_active
);
868 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
) {
870 bond_set_slave_inactive_flags(old_active
,
871 BOND_SLAVE_NOTIFY_NOW
);
874 bool should_notify_peers
= false;
876 bond_set_slave_active_flags(new_active
,
877 BOND_SLAVE_NOTIFY_NOW
);
879 if (bond
->params
.fail_over_mac
)
880 bond_do_fail_over_mac(bond
, new_active
,
883 if (netif_running(bond
->dev
)) {
884 bond
->send_peer_notif
=
885 bond
->params
.num_peer_notif
;
886 should_notify_peers
=
887 bond_should_notify_peers(bond
);
890 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER
, bond
->dev
);
891 if (should_notify_peers
)
892 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
,
897 /* resend IGMP joins since active slave has changed or
898 * all were sent on curr_active_slave.
899 * resend only if bond is brought up with the affected
900 * bonding modes and the retransmission is enabled
902 if (netif_running(bond
->dev
) && (bond
->params
.resend_igmp
> 0) &&
903 ((bond_uses_primary(bond
) && new_active
) ||
904 BOND_MODE(bond
) == BOND_MODE_ROUNDROBIN
)) {
905 bond
->igmp_retrans
= bond
->params
.resend_igmp
;
906 queue_delayed_work(bond
->wq
, &bond
->mcast_work
, 1);
911 * bond_select_active_slave - select a new active slave, if needed
912 * @bond: our bonding struct
914 * This functions should be called when one of the following occurs:
915 * - The old curr_active_slave has been released or lost its link.
916 * - The primary_slave has got its link back.
917 * - A slave has got its link back and there's no old curr_active_slave.
919 * Caller must hold RTNL.
921 void bond_select_active_slave(struct bonding
*bond
)
923 struct slave
*best_slave
;
928 best_slave
= bond_find_best_slave(bond
);
929 if (best_slave
!= rtnl_dereference(bond
->curr_active_slave
)) {
930 bond_change_active_slave(bond
, best_slave
);
931 rv
= bond_set_carrier(bond
);
935 if (netif_carrier_ok(bond
->dev
))
936 netdev_info(bond
->dev
, "first active interface up!\n");
938 netdev_info(bond
->dev
, "now running without any active interface!\n");
942 #ifdef CONFIG_NET_POLL_CONTROLLER
943 static inline int slave_enable_netpoll(struct slave
*slave
)
948 np
= kzalloc(sizeof(*np
), GFP_KERNEL
);
953 err
= __netpoll_setup(np
, slave
->dev
);
962 static inline void slave_disable_netpoll(struct slave
*slave
)
964 struct netpoll
*np
= slave
->np
;
970 __netpoll_free_async(np
);
973 static void bond_poll_controller(struct net_device
*bond_dev
)
975 struct bonding
*bond
= netdev_priv(bond_dev
);
976 struct slave
*slave
= NULL
;
977 struct list_head
*iter
;
978 struct ad_info ad_info
;
979 struct netpoll_info
*ni
;
980 const struct net_device_ops
*ops
;
982 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
983 if (bond_3ad_get_active_agg_info(bond
, &ad_info
))
986 bond_for_each_slave_rcu(bond
, slave
, iter
) {
987 ops
= slave
->dev
->netdev_ops
;
988 if (!bond_slave_is_up(slave
) || !ops
->ndo_poll_controller
)
991 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
992 struct aggregator
*agg
=
993 SLAVE_AD_INFO(slave
)->port
.aggregator
;
996 agg
->aggregator_identifier
!= ad_info
.aggregator_id
)
1000 ni
= rcu_dereference_bh(slave
->dev
->npinfo
);
1001 if (down_trylock(&ni
->dev_lock
))
1003 ops
->ndo_poll_controller(slave
->dev
);
1008 static void bond_netpoll_cleanup(struct net_device
*bond_dev
)
1010 struct bonding
*bond
= netdev_priv(bond_dev
);
1011 struct list_head
*iter
;
1012 struct slave
*slave
;
1014 bond_for_each_slave(bond
, slave
, iter
)
1015 if (bond_slave_is_up(slave
))
1016 slave_disable_netpoll(slave
);
1019 static int bond_netpoll_setup(struct net_device
*dev
, struct netpoll_info
*ni
)
1021 struct bonding
*bond
= netdev_priv(dev
);
1022 struct list_head
*iter
;
1023 struct slave
*slave
;
1026 bond_for_each_slave(bond
, slave
, iter
) {
1027 err
= slave_enable_netpoll(slave
);
1029 bond_netpoll_cleanup(dev
);
1036 static inline int slave_enable_netpoll(struct slave
*slave
)
1040 static inline void slave_disable_netpoll(struct slave
*slave
)
1043 static void bond_netpoll_cleanup(struct net_device
*bond_dev
)
1048 /*---------------------------------- IOCTL ----------------------------------*/
1050 static netdev_features_t
bond_fix_features(struct net_device
*dev
,
1051 netdev_features_t features
)
1053 struct bonding
*bond
= netdev_priv(dev
);
1054 struct list_head
*iter
;
1055 netdev_features_t mask
;
1056 struct slave
*slave
;
1060 features
&= ~NETIF_F_ONE_FOR_ALL
;
1061 features
|= NETIF_F_ALL_FOR_ALL
;
1063 bond_for_each_slave(bond
, slave
, iter
) {
1064 features
= netdev_increment_features(features
,
1065 slave
->dev
->features
,
1068 features
= netdev_add_tso_features(features
, mask
);
1073 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1075 NETIF_F_HIGHDMA | NETIF_F_LRO)
1077 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1078 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1080 static void bond_compute_features(struct bonding
*bond
)
1082 unsigned int dst_release_flag
= IFF_XMIT_DST_RELEASE
|
1083 IFF_XMIT_DST_RELEASE_PERM
;
1084 netdev_features_t vlan_features
= BOND_VLAN_FEATURES
;
1085 netdev_features_t enc_features
= BOND_ENC_FEATURES
;
1086 struct net_device
*bond_dev
= bond
->dev
;
1087 struct list_head
*iter
;
1088 struct slave
*slave
;
1089 unsigned short max_hard_header_len
= ETH_HLEN
;
1090 unsigned int gso_max_size
= GSO_MAX_SIZE
;
1091 u16 gso_max_segs
= GSO_MAX_SEGS
;
1093 if (!bond_has_slaves(bond
))
1095 vlan_features
&= NETIF_F_ALL_FOR_ALL
;
1097 bond_for_each_slave(bond
, slave
, iter
) {
1098 vlan_features
= netdev_increment_features(vlan_features
,
1099 slave
->dev
->vlan_features
, BOND_VLAN_FEATURES
);
1101 enc_features
= netdev_increment_features(enc_features
,
1102 slave
->dev
->hw_enc_features
,
1104 dst_release_flag
&= slave
->dev
->priv_flags
;
1105 if (slave
->dev
->hard_header_len
> max_hard_header_len
)
1106 max_hard_header_len
= slave
->dev
->hard_header_len
;
1108 gso_max_size
= min(gso_max_size
, slave
->dev
->gso_max_size
);
1109 gso_max_segs
= min(gso_max_segs
, slave
->dev
->gso_max_segs
);
1113 bond_dev
->vlan_features
= vlan_features
;
1114 bond_dev
->hw_enc_features
= enc_features
| NETIF_F_GSO_ENCAP_ALL
;
1115 bond_dev
->hard_header_len
= max_hard_header_len
;
1116 bond_dev
->gso_max_segs
= gso_max_segs
;
1117 netif_set_gso_max_size(bond_dev
, gso_max_size
);
1119 bond_dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1120 if ((bond_dev
->priv_flags
& IFF_XMIT_DST_RELEASE_PERM
) &&
1121 dst_release_flag
== (IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
))
1122 bond_dev
->priv_flags
|= IFF_XMIT_DST_RELEASE
;
1124 netdev_change_features(bond_dev
);
1127 static void bond_setup_by_slave(struct net_device
*bond_dev
,
1128 struct net_device
*slave_dev
)
1130 bond_dev
->header_ops
= slave_dev
->header_ops
;
1132 bond_dev
->type
= slave_dev
->type
;
1133 bond_dev
->hard_header_len
= slave_dev
->hard_header_len
;
1134 bond_dev
->addr_len
= slave_dev
->addr_len
;
1136 memcpy(bond_dev
->broadcast
, slave_dev
->broadcast
,
1137 slave_dev
->addr_len
);
1140 /* On bonding slaves other than the currently active slave, suppress
1141 * duplicates except for alb non-mcast/bcast.
1143 static bool bond_should_deliver_exact_match(struct sk_buff
*skb
,
1144 struct slave
*slave
,
1145 struct bonding
*bond
)
1147 if (bond_is_slave_inactive(slave
)) {
1148 if (BOND_MODE(bond
) == BOND_MODE_ALB
&&
1149 skb
->pkt_type
!= PACKET_BROADCAST
&&
1150 skb
->pkt_type
!= PACKET_MULTICAST
)
1157 static rx_handler_result_t
bond_handle_frame(struct sk_buff
**pskb
)
1159 struct sk_buff
*skb
= *pskb
;
1160 struct slave
*slave
;
1161 struct bonding
*bond
;
1162 int (*recv_probe
)(const struct sk_buff
*, struct bonding
*,
1164 int ret
= RX_HANDLER_ANOTHER
;
1166 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1168 return RX_HANDLER_CONSUMED
;
1172 slave
= bond_slave_get_rcu(skb
->dev
);
1175 recv_probe
= ACCESS_ONCE(bond
->recv_probe
);
1177 ret
= recv_probe(skb
, bond
, slave
);
1178 if (ret
== RX_HANDLER_CONSUMED
) {
1184 if (bond_should_deliver_exact_match(skb
, slave
, bond
))
1185 return RX_HANDLER_EXACT
;
1187 skb
->dev
= bond
->dev
;
1189 if (BOND_MODE(bond
) == BOND_MODE_ALB
&&
1190 bond
->dev
->priv_flags
& IFF_BRIDGE_PORT
&&
1191 skb
->pkt_type
== PACKET_HOST
) {
1193 if (unlikely(skb_cow_head(skb
,
1194 skb
->data
- skb_mac_header(skb
)))) {
1196 return RX_HANDLER_CONSUMED
;
1198 ether_addr_copy(eth_hdr(skb
)->h_dest
, bond
->dev
->dev_addr
);
1204 static enum netdev_lag_tx_type
bond_lag_tx_type(struct bonding
*bond
)
1206 switch (BOND_MODE(bond
)) {
1207 case BOND_MODE_ROUNDROBIN
:
1208 return NETDEV_LAG_TX_TYPE_ROUNDROBIN
;
1209 case BOND_MODE_ACTIVEBACKUP
:
1210 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP
;
1211 case BOND_MODE_BROADCAST
:
1212 return NETDEV_LAG_TX_TYPE_BROADCAST
;
1214 case BOND_MODE_8023AD
:
1215 return NETDEV_LAG_TX_TYPE_HASH
;
1217 return NETDEV_LAG_TX_TYPE_UNKNOWN
;
1221 static int bond_master_upper_dev_link(struct bonding
*bond
, struct slave
*slave
)
1223 struct netdev_lag_upper_info lag_upper_info
;
1226 lag_upper_info
.tx_type
= bond_lag_tx_type(bond
);
1227 err
= netdev_master_upper_dev_link(slave
->dev
, bond
->dev
, slave
,
1231 rtmsg_ifinfo(RTM_NEWLINK
, slave
->dev
, IFF_SLAVE
, GFP_KERNEL
);
1235 static void bond_upper_dev_unlink(struct bonding
*bond
, struct slave
*slave
)
1237 netdev_upper_dev_unlink(slave
->dev
, bond
->dev
);
1238 slave
->dev
->flags
&= ~IFF_SLAVE
;
1239 rtmsg_ifinfo(RTM_NEWLINK
, slave
->dev
, IFF_SLAVE
, GFP_KERNEL
);
1242 static struct slave
*bond_alloc_slave(struct bonding
*bond
)
1244 struct slave
*slave
= NULL
;
1246 slave
= kzalloc(sizeof(*slave
), GFP_KERNEL
);
1250 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
1251 SLAVE_AD_INFO(slave
) = kzalloc(sizeof(struct ad_slave_info
),
1253 if (!SLAVE_AD_INFO(slave
)) {
1261 static void bond_free_slave(struct slave
*slave
)
1263 struct bonding
*bond
= bond_get_bond_by_slave(slave
);
1265 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
1266 kfree(SLAVE_AD_INFO(slave
));
1271 static void bond_fill_ifbond(struct bonding
*bond
, struct ifbond
*info
)
1273 info
->bond_mode
= BOND_MODE(bond
);
1274 info
->miimon
= bond
->params
.miimon
;
1275 info
->num_slaves
= bond
->slave_cnt
;
1278 static void bond_fill_ifslave(struct slave
*slave
, struct ifslave
*info
)
1280 strcpy(info
->slave_name
, slave
->dev
->name
);
1281 info
->link
= slave
->link
;
1282 info
->state
= bond_slave_state(slave
);
1283 info
->link_failure_count
= slave
->link_failure_count
;
1286 static void bond_netdev_notify(struct net_device
*dev
,
1287 struct netdev_bonding_info
*info
)
1290 netdev_bonding_info_change(dev
, info
);
1294 static void bond_netdev_notify_work(struct work_struct
*_work
)
1296 struct netdev_notify_work
*w
=
1297 container_of(_work
, struct netdev_notify_work
, work
.work
);
1299 bond_netdev_notify(w
->dev
, &w
->bonding_info
);
1304 void bond_queue_slave_event(struct slave
*slave
)
1306 struct bonding
*bond
= slave
->bond
;
1307 struct netdev_notify_work
*nnw
= kzalloc(sizeof(*nnw
), GFP_ATOMIC
);
1312 dev_hold(slave
->dev
);
1313 nnw
->dev
= slave
->dev
;
1314 bond_fill_ifslave(slave
, &nnw
->bonding_info
.slave
);
1315 bond_fill_ifbond(bond
, &nnw
->bonding_info
.master
);
1316 INIT_DELAYED_WORK(&nnw
->work
, bond_netdev_notify_work
);
1318 queue_delayed_work(slave
->bond
->wq
, &nnw
->work
, 0);
1321 void bond_lower_state_changed(struct slave
*slave
)
1323 struct netdev_lag_lower_state_info info
;
1325 info
.link_up
= slave
->link
== BOND_LINK_UP
||
1326 slave
->link
== BOND_LINK_FAIL
;
1327 info
.tx_enabled
= bond_is_active_slave(slave
);
1328 netdev_lower_state_changed(slave
->dev
, &info
);
1331 /* enslave device <slave> to bond device <master> */
1332 int bond_enslave(struct net_device
*bond_dev
, struct net_device
*slave_dev
)
1334 struct bonding
*bond
= netdev_priv(bond_dev
);
1335 const struct net_device_ops
*slave_ops
= slave_dev
->netdev_ops
;
1336 struct slave
*new_slave
= NULL
, *prev_slave
;
1337 struct sockaddr addr
;
1341 if (!bond
->params
.use_carrier
&&
1342 slave_dev
->ethtool_ops
->get_link
== NULL
&&
1343 slave_ops
->ndo_do_ioctl
== NULL
) {
1344 netdev_warn(bond_dev
, "no link monitoring support for %s\n",
1348 /* already in-use? */
1349 if (netdev_is_rx_handler_busy(slave_dev
)) {
1350 netdev_err(bond_dev
,
1351 "Error: Device is in use and cannot be enslaved\n");
1355 if (bond_dev
== slave_dev
) {
1356 netdev_err(bond_dev
, "cannot enslave bond to itself.\n");
1360 /* vlan challenged mutual exclusion */
1361 /* no need to lock since we're protected by rtnl_lock */
1362 if (slave_dev
->features
& NETIF_F_VLAN_CHALLENGED
) {
1363 netdev_dbg(bond_dev
, "%s is NETIF_F_VLAN_CHALLENGED\n",
1365 if (vlan_uses_dev(bond_dev
)) {
1366 netdev_err(bond_dev
, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1367 slave_dev
->name
, bond_dev
->name
);
1370 netdev_warn(bond_dev
, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1371 slave_dev
->name
, slave_dev
->name
,
1375 netdev_dbg(bond_dev
, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1379 /* Old ifenslave binaries are no longer supported. These can
1380 * be identified with moderate accuracy by the state of the slave:
1381 * the current ifenslave will set the interface down prior to
1382 * enslaving it; the old ifenslave will not.
1384 if (slave_dev
->flags
& IFF_UP
) {
1385 netdev_err(bond_dev
, "%s is up - this may be due to an out of date ifenslave\n",
1390 /* set bonding device ether type by slave - bonding netdevices are
1391 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1392 * there is a need to override some of the type dependent attribs/funcs.
1394 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1395 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1397 if (!bond_has_slaves(bond
)) {
1398 if (bond_dev
->type
!= slave_dev
->type
) {
1399 netdev_dbg(bond_dev
, "change device type from %d to %d\n",
1400 bond_dev
->type
, slave_dev
->type
);
1402 res
= call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE
,
1404 res
= notifier_to_errno(res
);
1406 netdev_err(bond_dev
, "refused to change device type\n");
1410 /* Flush unicast and multicast addresses */
1411 dev_uc_flush(bond_dev
);
1412 dev_mc_flush(bond_dev
);
1414 if (slave_dev
->type
!= ARPHRD_ETHER
)
1415 bond_setup_by_slave(bond_dev
, slave_dev
);
1417 ether_setup(bond_dev
);
1418 bond_dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
1421 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE
,
1424 } else if (bond_dev
->type
!= slave_dev
->type
) {
1425 netdev_err(bond_dev
, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1426 slave_dev
->name
, slave_dev
->type
, bond_dev
->type
);
1430 if (slave_dev
->type
== ARPHRD_INFINIBAND
&&
1431 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1432 netdev_warn(bond_dev
, "Type (%d) supports only active-backup mode\n",
1435 goto err_undo_flags
;
1438 if (!slave_ops
->ndo_set_mac_address
||
1439 slave_dev
->type
== ARPHRD_INFINIBAND
) {
1440 netdev_warn(bond_dev
, "The slave device specified does not support setting the MAC address\n");
1441 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
&&
1442 bond
->params
.fail_over_mac
!= BOND_FOM_ACTIVE
) {
1443 if (!bond_has_slaves(bond
)) {
1444 bond
->params
.fail_over_mac
= BOND_FOM_ACTIVE
;
1445 netdev_warn(bond_dev
, "Setting fail_over_mac to active for active-backup mode\n");
1447 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");
1449 goto err_undo_flags
;
1454 call_netdevice_notifiers(NETDEV_JOIN
, slave_dev
);
1456 /* If this is the first slave, then we need to set the master's hardware
1457 * address to be the same as the slave's.
1459 if (!bond_has_slaves(bond
) &&
1460 bond
->dev
->addr_assign_type
== NET_ADDR_RANDOM
)
1461 bond_set_dev_addr(bond
->dev
, slave_dev
);
1463 new_slave
= bond_alloc_slave(bond
);
1466 goto err_undo_flags
;
1469 new_slave
->bond
= bond
;
1470 new_slave
->dev
= slave_dev
;
1471 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1472 * is set via sysfs or module option if desired.
1474 new_slave
->queue_id
= 0;
1476 /* Save slave's original mtu and then set it to match the bond */
1477 new_slave
->original_mtu
= slave_dev
->mtu
;
1478 res
= dev_set_mtu(slave_dev
, bond
->dev
->mtu
);
1480 netdev_dbg(bond_dev
, "Error %d calling dev_set_mtu\n", res
);
1484 /* Save slave's original ("permanent") mac address for modes
1485 * that need it, and for restoring it upon release, and then
1486 * set it to the master's address
1488 ether_addr_copy(new_slave
->perm_hwaddr
, slave_dev
->dev_addr
);
1490 if (!bond
->params
.fail_over_mac
||
1491 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1492 /* Set slave to master's mac address. The application already
1493 * set the master's mac address to that of the first slave
1495 memcpy(addr
.sa_data
, bond_dev
->dev_addr
, bond_dev
->addr_len
);
1496 addr
.sa_family
= slave_dev
->type
;
1497 res
= dev_set_mac_address(slave_dev
, &addr
);
1499 netdev_dbg(bond_dev
, "Error %d calling set_mac_address\n", res
);
1500 goto err_restore_mtu
;
1504 /* set slave flag before open to prevent IPv6 addrconf */
1505 slave_dev
->flags
|= IFF_SLAVE
;
1507 /* open the slave since the application closed it */
1508 res
= dev_open(slave_dev
);
1510 netdev_dbg(bond_dev
, "Opening slave %s failed\n", slave_dev
->name
);
1511 goto err_restore_mac
;
1514 slave_dev
->priv_flags
|= IFF_BONDING
;
1515 /* initialize slave stats */
1516 dev_get_stats(new_slave
->dev
, &new_slave
->slave_stats
);
1518 if (bond_is_lb(bond
)) {
1519 /* bond_alb_init_slave() must be called before all other stages since
1520 * it might fail and we do not want to have to undo everything
1522 res
= bond_alb_init_slave(bond
, new_slave
);
1527 res
= vlan_vids_add_by_dev(slave_dev
, bond_dev
);
1529 netdev_err(bond_dev
, "Couldn't add bond vlan ids to %s\n",
1534 prev_slave
= bond_last_slave(bond
);
1536 new_slave
->delay
= 0;
1537 new_slave
->link_failure_count
= 0;
1539 bond_update_speed_duplex(new_slave
);
1541 new_slave
->last_rx
= jiffies
-
1542 (msecs_to_jiffies(bond
->params
.arp_interval
) + 1);
1543 for (i
= 0; i
< BOND_MAX_ARP_TARGETS
; i
++)
1544 new_slave
->target_last_arp_rx
[i
] = new_slave
->last_rx
;
1546 if (bond
->params
.miimon
&& !bond
->params
.use_carrier
) {
1547 link_reporting
= bond_check_dev_link(bond
, slave_dev
, 1);
1549 if ((link_reporting
== -1) && !bond
->params
.arp_interval
) {
1550 /* miimon is set but a bonded network driver
1551 * does not support ETHTOOL/MII and
1552 * arp_interval is not set. Note: if
1553 * use_carrier is enabled, we will never go
1554 * here (because netif_carrier is always
1555 * supported); thus, we don't need to change
1556 * the messages for netif_carrier.
1558 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",
1560 } else if (link_reporting
== -1) {
1561 /* unable get link status using mii/ethtool */
1562 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",
1567 /* check for initial state */
1568 new_slave
->link
= BOND_LINK_NOCHANGE
;
1569 if (bond
->params
.miimon
) {
1570 if (bond_check_dev_link(bond
, slave_dev
, 0) == BMSR_LSTATUS
) {
1571 if (bond
->params
.updelay
) {
1572 bond_set_slave_link_state(new_slave
,
1574 BOND_SLAVE_NOTIFY_NOW
);
1575 new_slave
->delay
= bond
->params
.updelay
;
1577 bond_set_slave_link_state(new_slave
,
1579 BOND_SLAVE_NOTIFY_NOW
);
1582 bond_set_slave_link_state(new_slave
, BOND_LINK_DOWN
,
1583 BOND_SLAVE_NOTIFY_NOW
);
1585 } else if (bond
->params
.arp_interval
) {
1586 bond_set_slave_link_state(new_slave
,
1587 (netif_carrier_ok(slave_dev
) ?
1588 BOND_LINK_UP
: BOND_LINK_DOWN
),
1589 BOND_SLAVE_NOTIFY_NOW
);
1591 bond_set_slave_link_state(new_slave
, BOND_LINK_UP
,
1592 BOND_SLAVE_NOTIFY_NOW
);
1595 if (new_slave
->link
!= BOND_LINK_DOWN
)
1596 new_slave
->last_link_up
= jiffies
;
1597 netdev_dbg(bond_dev
, "Initial state of slave_dev is BOND_LINK_%s\n",
1598 new_slave
->link
== BOND_LINK_DOWN
? "DOWN" :
1599 (new_slave
->link
== BOND_LINK_UP
? "UP" : "BACK"));
1601 if (bond_uses_primary(bond
) && bond
->params
.primary
[0]) {
1602 /* if there is a primary slave, remember it */
1603 if (strcmp(bond
->params
.primary
, new_slave
->dev
->name
) == 0) {
1604 rcu_assign_pointer(bond
->primary_slave
, new_slave
);
1605 bond
->force_primary
= true;
1609 switch (BOND_MODE(bond
)) {
1610 case BOND_MODE_ACTIVEBACKUP
:
1611 bond_set_slave_inactive_flags(new_slave
,
1612 BOND_SLAVE_NOTIFY_NOW
);
1614 case BOND_MODE_8023AD
:
1615 /* in 802.3ad mode, the internal mechanism
1616 * will activate the slaves in the selected
1619 bond_set_slave_inactive_flags(new_slave
, BOND_SLAVE_NOTIFY_NOW
);
1620 /* if this is the first slave */
1622 SLAVE_AD_INFO(new_slave
)->id
= 1;
1623 /* Initialize AD with the number of times that the AD timer is called in 1 second
1624 * can be called only after the mac address of the bond is set
1626 bond_3ad_initialize(bond
, 1000/AD_TIMER_INTERVAL
);
1628 SLAVE_AD_INFO(new_slave
)->id
=
1629 SLAVE_AD_INFO(prev_slave
)->id
+ 1;
1632 bond_3ad_bind_slave(new_slave
);
1636 bond_set_active_slave(new_slave
);
1637 bond_set_slave_inactive_flags(new_slave
, BOND_SLAVE_NOTIFY_NOW
);
1640 netdev_dbg(bond_dev
, "This slave is always active in trunk mode\n");
1642 /* always active in trunk mode */
1643 bond_set_active_slave(new_slave
);
1645 /* In trunking mode there is little meaning to curr_active_slave
1646 * anyway (it holds no special properties of the bond device),
1647 * so we can change it without calling change_active_interface()
1649 if (!rcu_access_pointer(bond
->curr_active_slave
) &&
1650 new_slave
->link
== BOND_LINK_UP
)
1651 rcu_assign_pointer(bond
->curr_active_slave
, new_slave
);
1654 } /* switch(bond_mode) */
1656 #ifdef CONFIG_NET_POLL_CONTROLLER
1657 if (bond
->dev
->npinfo
) {
1658 if (slave_enable_netpoll(new_slave
)) {
1659 netdev_info(bond_dev
, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1666 if (!(bond_dev
->features
& NETIF_F_LRO
))
1667 dev_disable_lro(slave_dev
);
1669 res
= netdev_rx_handler_register(slave_dev
, bond_handle_frame
,
1672 netdev_dbg(bond_dev
, "Error %d calling netdev_rx_handler_register\n", res
);
1676 res
= bond_master_upper_dev_link(bond
, new_slave
);
1678 netdev_dbg(bond_dev
, "Error %d calling bond_master_upper_dev_link\n", res
);
1679 goto err_unregister
;
1682 res
= bond_sysfs_slave_add(new_slave
);
1684 netdev_dbg(bond_dev
, "Error %d calling bond_sysfs_slave_add\n", res
);
1685 goto err_upper_unlink
;
1688 /* If the mode uses primary, then the following is handled by
1689 * bond_change_active_slave().
1691 if (!bond_uses_primary(bond
)) {
1692 /* set promiscuity level to new slave */
1693 if (bond_dev
->flags
& IFF_PROMISC
) {
1694 res
= dev_set_promiscuity(slave_dev
, 1);
1699 /* set allmulti level to new slave */
1700 if (bond_dev
->flags
& IFF_ALLMULTI
) {
1701 res
= dev_set_allmulti(slave_dev
, 1);
1703 if (bond_dev
->flags
& IFF_PROMISC
)
1704 dev_set_promiscuity(slave_dev
, -1);
1709 netif_addr_lock_bh(bond_dev
);
1710 dev_mc_sync_multiple(slave_dev
, bond_dev
);
1711 dev_uc_sync_multiple(slave_dev
, bond_dev
);
1712 netif_addr_unlock_bh(bond_dev
);
1714 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
1715 /* add lacpdu mc addr to mc list */
1716 u8 lacpdu_multicast
[ETH_ALEN
] = MULTICAST_LACPDU_ADDR
;
1718 dev_mc_add(slave_dev
, lacpdu_multicast
);
1723 bond_compute_features(bond
);
1724 bond_set_carrier(bond
);
1726 if (bond_uses_primary(bond
)) {
1728 bond_select_active_slave(bond
);
1729 unblock_netpoll_tx();
1732 if (bond_mode_uses_xmit_hash(bond
))
1733 bond_update_slave_arr(bond
, NULL
);
1735 netdev_info(bond_dev
, "Enslaving %s as %s interface with %s link\n",
1737 bond_is_active_slave(new_slave
) ? "an active" : "a backup",
1738 new_slave
->link
!= BOND_LINK_DOWN
? "an up" : "a down");
1740 /* enslave is successful */
1741 bond_queue_slave_event(new_slave
);
1744 /* Undo stages on error */
1746 bond_sysfs_slave_del(new_slave
);
1749 bond_upper_dev_unlink(bond
, new_slave
);
1752 netdev_rx_handler_unregister(slave_dev
);
1755 vlan_vids_del_by_dev(slave_dev
, bond_dev
);
1756 if (rcu_access_pointer(bond
->primary_slave
) == new_slave
)
1757 RCU_INIT_POINTER(bond
->primary_slave
, NULL
);
1758 if (rcu_access_pointer(bond
->curr_active_slave
) == new_slave
) {
1760 bond_change_active_slave(bond
, NULL
);
1761 bond_select_active_slave(bond
);
1762 unblock_netpoll_tx();
1764 /* either primary_slave or curr_active_slave might've changed */
1766 slave_disable_netpoll(new_slave
);
1769 slave_dev
->priv_flags
&= ~IFF_BONDING
;
1770 dev_close(slave_dev
);
1773 slave_dev
->flags
&= ~IFF_SLAVE
;
1774 if (!bond
->params
.fail_over_mac
||
1775 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1776 /* XXX TODO - fom follow mode needs to change master's
1777 * MAC if this slave's MAC is in use by the bond, or at
1778 * least print a warning.
1780 ether_addr_copy(addr
.sa_data
, new_slave
->perm_hwaddr
);
1781 addr
.sa_family
= slave_dev
->type
;
1782 dev_set_mac_address(slave_dev
, &addr
);
1786 dev_set_mtu(slave_dev
, new_slave
->original_mtu
);
1789 bond_free_slave(new_slave
);
1792 /* Enslave of first slave has failed and we need to fix master's mac */
1793 if (!bond_has_slaves(bond
)) {
1794 if (ether_addr_equal_64bits(bond_dev
->dev_addr
,
1795 slave_dev
->dev_addr
))
1796 eth_hw_addr_random(bond_dev
);
1797 if (bond_dev
->type
!= ARPHRD_ETHER
) {
1798 dev_close(bond_dev
);
1799 ether_setup(bond_dev
);
1800 bond_dev
->flags
|= IFF_MASTER
;
1801 bond_dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
1808 /* Try to release the slave device <slave> from the bond device <master>
1809 * It is legal to access curr_active_slave without a lock because all the function
1810 * is RTNL-locked. If "all" is true it means that the function is being called
1811 * while destroying a bond interface and all slaves are being released.
1813 * The rules for slave state should be:
1814 * for Active/Backup:
1815 * Active stays on all backups go down
1816 * for Bonded connections:
1817 * The first up interface should be left on and all others downed.
1819 static int __bond_release_one(struct net_device
*bond_dev
,
1820 struct net_device
*slave_dev
,
1823 struct bonding
*bond
= netdev_priv(bond_dev
);
1824 struct slave
*slave
, *oldcurrent
;
1825 struct sockaddr addr
;
1826 int old_flags
= bond_dev
->flags
;
1827 netdev_features_t old_features
= bond_dev
->features
;
1829 /* slave is not a slave or master is not master of this slave */
1830 if (!(slave_dev
->flags
& IFF_SLAVE
) ||
1831 !netdev_has_upper_dev(slave_dev
, bond_dev
)) {
1832 netdev_dbg(bond_dev
, "cannot release %s\n",
1839 slave
= bond_get_slave_by_dev(bond
, slave_dev
);
1841 /* not a slave of this bond */
1842 netdev_info(bond_dev
, "%s not enslaved\n",
1844 unblock_netpoll_tx();
1848 bond_set_slave_inactive_flags(slave
, BOND_SLAVE_NOTIFY_NOW
);
1850 bond_sysfs_slave_del(slave
);
1852 /* recompute stats just before removing the slave */
1853 bond_get_stats(bond
->dev
, &bond
->bond_stats
);
1855 bond_upper_dev_unlink(bond
, slave
);
1856 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1857 * for this slave anymore.
1859 netdev_rx_handler_unregister(slave_dev
);
1861 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
1862 bond_3ad_unbind_slave(slave
);
1864 if (bond_mode_uses_xmit_hash(bond
))
1865 bond_update_slave_arr(bond
, slave
);
1867 netdev_info(bond_dev
, "Releasing %s interface %s\n",
1868 bond_is_active_slave(slave
) ? "active" : "backup",
1871 oldcurrent
= rcu_access_pointer(bond
->curr_active_slave
);
1873 RCU_INIT_POINTER(bond
->current_arp_slave
, NULL
);
1875 if (!all
&& (!bond
->params
.fail_over_mac
||
1876 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
)) {
1877 if (ether_addr_equal_64bits(bond_dev
->dev_addr
, slave
->perm_hwaddr
) &&
1878 bond_has_slaves(bond
))
1879 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",
1880 slave_dev
->name
, slave
->perm_hwaddr
,
1881 bond_dev
->name
, slave_dev
->name
);
1884 if (rtnl_dereference(bond
->primary_slave
) == slave
)
1885 RCU_INIT_POINTER(bond
->primary_slave
, NULL
);
1887 if (oldcurrent
== slave
)
1888 bond_change_active_slave(bond
, NULL
);
1890 if (bond_is_lb(bond
)) {
1891 /* Must be called only after the slave has been
1892 * detached from the list and the curr_active_slave
1893 * has been cleared (if our_slave == old_current),
1894 * but before a new active slave is selected.
1896 bond_alb_deinit_slave(bond
, slave
);
1900 RCU_INIT_POINTER(bond
->curr_active_slave
, NULL
);
1901 } else if (oldcurrent
== slave
) {
1902 /* Note that we hold RTNL over this sequence, so there
1903 * is no concern that another slave add/remove event
1906 bond_select_active_slave(bond
);
1909 if (!bond_has_slaves(bond
)) {
1910 bond_set_carrier(bond
);
1911 eth_hw_addr_random(bond_dev
);
1914 unblock_netpoll_tx();
1918 if (!bond_has_slaves(bond
)) {
1919 call_netdevice_notifiers(NETDEV_CHANGEADDR
, bond
->dev
);
1920 call_netdevice_notifiers(NETDEV_RELEASE
, bond
->dev
);
1923 bond_compute_features(bond
);
1924 if (!(bond_dev
->features
& NETIF_F_VLAN_CHALLENGED
) &&
1925 (old_features
& NETIF_F_VLAN_CHALLENGED
))
1926 netdev_info(bond_dev
, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1927 slave_dev
->name
, bond_dev
->name
);
1929 vlan_vids_del_by_dev(slave_dev
, bond_dev
);
1931 /* If the mode uses primary, then this case was handled above by
1932 * bond_change_active_slave(..., NULL)
1934 if (!bond_uses_primary(bond
)) {
1935 /* unset promiscuity level from slave
1936 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1937 * of the IFF_PROMISC flag in the bond_dev, but we need the
1938 * value of that flag before that change, as that was the value
1939 * when this slave was attached, so we cache at the start of the
1940 * function and use it here. Same goes for ALLMULTI below
1942 if (old_flags
& IFF_PROMISC
)
1943 dev_set_promiscuity(slave_dev
, -1);
1945 /* unset allmulti level from slave */
1946 if (old_flags
& IFF_ALLMULTI
)
1947 dev_set_allmulti(slave_dev
, -1);
1949 bond_hw_addr_flush(bond_dev
, slave_dev
);
1952 slave_disable_netpoll(slave
);
1954 /* close slave before restoring its mac address */
1955 dev_close(slave_dev
);
1957 if (bond
->params
.fail_over_mac
!= BOND_FOM_ACTIVE
||
1958 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1959 /* restore original ("permanent") mac address */
1960 ether_addr_copy(addr
.sa_data
, slave
->perm_hwaddr
);
1961 addr
.sa_family
= slave_dev
->type
;
1962 dev_set_mac_address(slave_dev
, &addr
);
1965 dev_set_mtu(slave_dev
, slave
->original_mtu
);
1967 slave_dev
->priv_flags
&= ~IFF_BONDING
;
1969 bond_free_slave(slave
);
1974 /* A wrapper used because of ndo_del_link */
1975 int bond_release(struct net_device
*bond_dev
, struct net_device
*slave_dev
)
1977 return __bond_release_one(bond_dev
, slave_dev
, false);
1980 /* First release a slave and then destroy the bond if no more slaves are left.
1981 * Must be under rtnl_lock when this function is called.
1983 static int bond_release_and_destroy(struct net_device
*bond_dev
,
1984 struct net_device
*slave_dev
)
1986 struct bonding
*bond
= netdev_priv(bond_dev
);
1989 ret
= bond_release(bond_dev
, slave_dev
);
1990 if (ret
== 0 && !bond_has_slaves(bond
)) {
1991 bond_dev
->priv_flags
|= IFF_DISABLE_NETPOLL
;
1992 netdev_info(bond_dev
, "Destroying bond %s\n",
1994 bond_remove_proc_entry(bond
);
1995 unregister_netdevice(bond_dev
);
2000 static int bond_info_query(struct net_device
*bond_dev
, struct ifbond
*info
)
2002 struct bonding
*bond
= netdev_priv(bond_dev
);
2003 bond_fill_ifbond(bond
, info
);
2007 static int bond_slave_info_query(struct net_device
*bond_dev
, struct ifslave
*info
)
2009 struct bonding
*bond
= netdev_priv(bond_dev
);
2010 struct list_head
*iter
;
2011 int i
= 0, res
= -ENODEV
;
2012 struct slave
*slave
;
2014 bond_for_each_slave(bond
, slave
, iter
) {
2015 if (i
++ == (int)info
->slave_id
) {
2017 bond_fill_ifslave(slave
, info
);
2025 /*-------------------------------- Monitoring -------------------------------*/
2027 /* called with rcu_read_lock() */
2028 static int bond_miimon_inspect(struct bonding
*bond
)
2030 int link_state
, commit
= 0;
2031 struct list_head
*iter
;
2032 struct slave
*slave
;
2033 bool ignore_updelay
;
2035 ignore_updelay
= !rcu_dereference(bond
->curr_active_slave
);
2037 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2038 slave
->new_link
= BOND_LINK_NOCHANGE
;
2040 link_state
= bond_check_dev_link(bond
, slave
->dev
, 0);
2042 switch (slave
->link
) {
2047 bond_set_slave_link_state(slave
, BOND_LINK_FAIL
,
2048 BOND_SLAVE_NOTIFY_LATER
);
2049 slave
->delay
= bond
->params
.downdelay
;
2051 netdev_info(bond
->dev
, "link status down for %sinterface %s, disabling it in %d ms\n",
2053 BOND_MODE_ACTIVEBACKUP
) ?
2054 (bond_is_active_slave(slave
) ?
2055 "active " : "backup ") : "",
2057 bond
->params
.downdelay
* bond
->params
.miimon
);
2060 case BOND_LINK_FAIL
:
2062 /* recovered before downdelay expired */
2063 bond_set_slave_link_state(slave
, BOND_LINK_UP
,
2064 BOND_SLAVE_NOTIFY_LATER
);
2065 slave
->last_link_up
= jiffies
;
2066 netdev_info(bond
->dev
, "link status up again after %d ms for interface %s\n",
2067 (bond
->params
.downdelay
- slave
->delay
) *
2068 bond
->params
.miimon
,
2074 if (slave
->delay
<= 0) {
2075 slave
->new_link
= BOND_LINK_DOWN
;
2083 case BOND_LINK_DOWN
:
2087 bond_set_slave_link_state(slave
, BOND_LINK_BACK
,
2088 BOND_SLAVE_NOTIFY_LATER
);
2089 slave
->delay
= bond
->params
.updelay
;
2092 netdev_info(bond
->dev
, "link status up for interface %s, enabling it in %d ms\n",
2094 ignore_updelay
? 0 :
2095 bond
->params
.updelay
*
2096 bond
->params
.miimon
);
2099 case BOND_LINK_BACK
:
2101 bond_set_slave_link_state(slave
,
2103 BOND_SLAVE_NOTIFY_LATER
);
2104 netdev_info(bond
->dev
, "link status down again after %d ms for interface %s\n",
2105 (bond
->params
.updelay
- slave
->delay
) *
2106 bond
->params
.miimon
,
2115 if (slave
->delay
<= 0) {
2116 slave
->new_link
= BOND_LINK_UP
;
2118 ignore_updelay
= false;
2130 static void bond_miimon_commit(struct bonding
*bond
)
2132 struct list_head
*iter
;
2133 struct slave
*slave
, *primary
;
2135 bond_for_each_slave(bond
, slave
, iter
) {
2136 switch (slave
->new_link
) {
2137 case BOND_LINK_NOCHANGE
:
2141 bond_update_speed_duplex(slave
);
2142 bond_set_slave_link_state(slave
, BOND_LINK_UP
,
2143 BOND_SLAVE_NOTIFY_NOW
);
2144 slave
->last_link_up
= jiffies
;
2146 primary
= rtnl_dereference(bond
->primary_slave
);
2147 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
2148 /* prevent it from being the active one */
2149 bond_set_backup_slave(slave
);
2150 } else if (BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
2151 /* make it immediately active */
2152 bond_set_active_slave(slave
);
2153 } else if (slave
!= primary
) {
2154 /* prevent it from being the active one */
2155 bond_set_backup_slave(slave
);
2158 netdev_info(bond
->dev
, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2160 slave
->speed
== SPEED_UNKNOWN
? 0 : slave
->speed
,
2161 slave
->duplex
? "full" : "half");
2163 /* notify ad that the link status has changed */
2164 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
2165 bond_3ad_handle_link_change(slave
, BOND_LINK_UP
);
2167 if (bond_is_lb(bond
))
2168 bond_alb_handle_link_change(bond
, slave
,
2171 if (BOND_MODE(bond
) == BOND_MODE_XOR
)
2172 bond_update_slave_arr(bond
, NULL
);
2174 if (!bond
->curr_active_slave
|| slave
== primary
)
2179 case BOND_LINK_DOWN
:
2180 if (slave
->link_failure_count
< UINT_MAX
)
2181 slave
->link_failure_count
++;
2183 bond_set_slave_link_state(slave
, BOND_LINK_DOWN
,
2184 BOND_SLAVE_NOTIFY_NOW
);
2186 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
||
2187 BOND_MODE(bond
) == BOND_MODE_8023AD
)
2188 bond_set_slave_inactive_flags(slave
,
2189 BOND_SLAVE_NOTIFY_NOW
);
2191 netdev_info(bond
->dev
, "link status definitely down for interface %s, disabling it\n",
2194 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
2195 bond_3ad_handle_link_change(slave
,
2198 if (bond_is_lb(bond
))
2199 bond_alb_handle_link_change(bond
, slave
,
2202 if (BOND_MODE(bond
) == BOND_MODE_XOR
)
2203 bond_update_slave_arr(bond
, NULL
);
2205 if (slave
== rcu_access_pointer(bond
->curr_active_slave
))
2211 netdev_err(bond
->dev
, "invalid new link %d on slave %s\n",
2212 slave
->new_link
, slave
->dev
->name
);
2213 slave
->new_link
= BOND_LINK_NOCHANGE
;
2220 bond_select_active_slave(bond
);
2221 unblock_netpoll_tx();
2224 bond_set_carrier(bond
);
2229 * Really a wrapper that splits the mii monitor into two phases: an
2230 * inspection, then (if inspection indicates something needs to be done)
2231 * an acquisition of appropriate locks followed by a commit phase to
2232 * implement whatever link state changes are indicated.
2234 static void bond_mii_monitor(struct work_struct
*work
)
2236 struct bonding
*bond
= container_of(work
, struct bonding
,
2238 bool should_notify_peers
= false;
2239 unsigned long delay
;
2241 delay
= msecs_to_jiffies(bond
->params
.miimon
);
2243 if (!bond_has_slaves(bond
))
2248 should_notify_peers
= bond_should_notify_peers(bond
);
2250 if (bond_miimon_inspect(bond
)) {
2253 /* Race avoidance with bond_close cancel of workqueue */
2254 if (!rtnl_trylock()) {
2256 should_notify_peers
= false;
2260 bond_miimon_commit(bond
);
2262 rtnl_unlock(); /* might sleep, hold no other locks */
2267 if (bond
->params
.miimon
)
2268 queue_delayed_work(bond
->wq
, &bond
->mii_work
, delay
);
2270 if (should_notify_peers
) {
2271 if (!rtnl_trylock())
2273 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, bond
->dev
);
2278 static bool bond_has_this_ip(struct bonding
*bond
, __be32 ip
)
2280 struct net_device
*upper
;
2281 struct list_head
*iter
;
2284 if (ip
== bond_confirm_addr(bond
->dev
, 0, ip
))
2288 netdev_for_each_all_upper_dev_rcu(bond
->dev
, upper
, iter
) {
2289 if (ip
== bond_confirm_addr(upper
, 0, ip
)) {
2299 /* We go to the (large) trouble of VLAN tagging ARP frames because
2300 * switches in VLAN mode (especially if ports are configured as
2301 * "native" to a VLAN) might not pass non-tagged frames.
2303 static void bond_arp_send(struct net_device
*slave_dev
, int arp_op
,
2304 __be32 dest_ip
, __be32 src_ip
,
2305 struct bond_vlan_tag
*tags
)
2307 struct sk_buff
*skb
;
2308 struct bond_vlan_tag
*outer_tag
= tags
;
2310 netdev_dbg(slave_dev
, "arp %d on slave %s: dst %pI4 src %pI4\n",
2311 arp_op
, slave_dev
->name
, &dest_ip
, &src_ip
);
2313 skb
= arp_create(arp_op
, ETH_P_ARP
, dest_ip
, slave_dev
, src_ip
,
2314 NULL
, slave_dev
->dev_addr
, NULL
);
2317 net_err_ratelimited("ARP packet allocation failed\n");
2321 if (!tags
|| tags
->vlan_proto
== VLAN_N_VID
)
2326 /* Go through all the tags backwards and add them to the packet */
2327 while (tags
->vlan_proto
!= VLAN_N_VID
) {
2328 if (!tags
->vlan_id
) {
2333 netdev_dbg(slave_dev
, "inner tag: proto %X vid %X\n",
2334 ntohs(outer_tag
->vlan_proto
), tags
->vlan_id
);
2335 skb
= vlan_insert_tag_set_proto(skb
, tags
->vlan_proto
,
2338 net_err_ratelimited("failed to insert inner VLAN tag\n");
2344 /* Set the outer tag */
2345 if (outer_tag
->vlan_id
) {
2346 netdev_dbg(slave_dev
, "outer tag: proto %X vid %X\n",
2347 ntohs(outer_tag
->vlan_proto
), outer_tag
->vlan_id
);
2348 __vlan_hwaccel_put_tag(skb
, outer_tag
->vlan_proto
,
2349 outer_tag
->vlan_id
);
2356 /* Validate the device path between the @start_dev and the @end_dev.
2357 * The path is valid if the @end_dev is reachable through device
2359 * When the path is validated, collect any vlan information in the
2362 struct bond_vlan_tag
*bond_verify_device_path(struct net_device
*start_dev
,
2363 struct net_device
*end_dev
,
2366 struct bond_vlan_tag
*tags
;
2367 struct net_device
*upper
;
2368 struct list_head
*iter
;
2370 if (start_dev
== end_dev
) {
2371 tags
= kzalloc(sizeof(*tags
) * (level
+ 1), GFP_ATOMIC
);
2373 return ERR_PTR(-ENOMEM
);
2374 tags
[level
].vlan_proto
= VLAN_N_VID
;
2378 netdev_for_each_upper_dev_rcu(start_dev
, upper
, iter
) {
2379 tags
= bond_verify_device_path(upper
, end_dev
, level
+ 1);
2380 if (IS_ERR_OR_NULL(tags
)) {
2385 if (is_vlan_dev(upper
)) {
2386 tags
[level
].vlan_proto
= vlan_dev_vlan_proto(upper
);
2387 tags
[level
].vlan_id
= vlan_dev_vlan_id(upper
);
2396 static void bond_arp_send_all(struct bonding
*bond
, struct slave
*slave
)
2399 struct bond_vlan_tag
*tags
;
2400 __be32
*targets
= bond
->params
.arp_targets
, addr
;
2403 for (i
= 0; i
< BOND_MAX_ARP_TARGETS
&& targets
[i
]; i
++) {
2404 netdev_dbg(bond
->dev
, "basa: target %pI4\n", &targets
[i
]);
2407 /* Find out through which dev should the packet go */
2408 rt
= ip_route_output(dev_net(bond
->dev
), targets
[i
], 0,
2411 /* there's no route to target - try to send arp
2412 * probe to generate any traffic (arp_validate=0)
2414 if (bond
->params
.arp_validate
)
2415 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2418 bond_arp_send(slave
->dev
, ARPOP_REQUEST
, targets
[i
],
2423 /* bond device itself */
2424 if (rt
->dst
.dev
== bond
->dev
)
2428 tags
= bond_verify_device_path(bond
->dev
, rt
->dst
.dev
, 0);
2431 if (!IS_ERR_OR_NULL(tags
))
2434 /* Not our device - skip */
2435 netdev_dbg(bond
->dev
, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2436 &targets
[i
], rt
->dst
.dev
? rt
->dst
.dev
->name
: "NULL");
2442 addr
= bond_confirm_addr(rt
->dst
.dev
, targets
[i
], 0);
2444 bond_arp_send(slave
->dev
, ARPOP_REQUEST
, targets
[i
],
2450 static void bond_validate_arp(struct bonding
*bond
, struct slave
*slave
, __be32 sip
, __be32 tip
)
2454 if (!sip
|| !bond_has_this_ip(bond
, tip
)) {
2455 netdev_dbg(bond
->dev
, "bva: sip %pI4 tip %pI4 not found\n",
2460 i
= bond_get_targets_ip(bond
->params
.arp_targets
, sip
);
2462 netdev_dbg(bond
->dev
, "bva: sip %pI4 not found in targets\n",
2466 slave
->last_rx
= jiffies
;
2467 slave
->target_last_arp_rx
[i
] = jiffies
;
2470 int bond_arp_rcv(const struct sk_buff
*skb
, struct bonding
*bond
,
2471 struct slave
*slave
)
2473 struct arphdr
*arp
= (struct arphdr
*)skb
->data
;
2474 struct slave
*curr_active_slave
, *curr_arp_slave
;
2475 unsigned char *arp_ptr
;
2477 int alen
, is_arp
= skb
->protocol
== __cpu_to_be16(ETH_P_ARP
);
2479 if (!slave_do_arp_validate(bond
, slave
)) {
2480 if ((slave_do_arp_validate_only(bond
) && is_arp
) ||
2481 !slave_do_arp_validate_only(bond
))
2482 slave
->last_rx
= jiffies
;
2483 return RX_HANDLER_ANOTHER
;
2484 } else if (!is_arp
) {
2485 return RX_HANDLER_ANOTHER
;
2488 alen
= arp_hdr_len(bond
->dev
);
2490 netdev_dbg(bond
->dev
, "bond_arp_rcv: skb->dev %s\n",
2493 if (alen
> skb_headlen(skb
)) {
2494 arp
= kmalloc(alen
, GFP_ATOMIC
);
2497 if (skb_copy_bits(skb
, 0, arp
, alen
) < 0)
2501 if (arp
->ar_hln
!= bond
->dev
->addr_len
||
2502 skb
->pkt_type
== PACKET_OTHERHOST
||
2503 skb
->pkt_type
== PACKET_LOOPBACK
||
2504 arp
->ar_hrd
!= htons(ARPHRD_ETHER
) ||
2505 arp
->ar_pro
!= htons(ETH_P_IP
) ||
2509 arp_ptr
= (unsigned char *)(arp
+ 1);
2510 arp_ptr
+= bond
->dev
->addr_len
;
2511 memcpy(&sip
, arp_ptr
, 4);
2512 arp_ptr
+= 4 + bond
->dev
->addr_len
;
2513 memcpy(&tip
, arp_ptr
, 4);
2515 netdev_dbg(bond
->dev
, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2516 slave
->dev
->name
, bond_slave_state(slave
),
2517 bond
->params
.arp_validate
, slave_do_arp_validate(bond
, slave
),
2520 curr_active_slave
= rcu_dereference(bond
->curr_active_slave
);
2521 curr_arp_slave
= rcu_dereference(bond
->current_arp_slave
);
2523 /* We 'trust' the received ARP enough to validate it if:
2525 * (a) the slave receiving the ARP is active (which includes the
2526 * current ARP slave, if any), or
2528 * (b) the receiving slave isn't active, but there is a currently
2529 * active slave and it received valid arp reply(s) after it became
2530 * the currently active slave, or
2532 * (c) there is an ARP slave that sent an ARP during the prior ARP
2533 * interval, and we receive an ARP reply on any slave. We accept
2534 * these because switch FDB update delays may deliver the ARP
2535 * reply to a slave other than the sender of the ARP request.
2537 * Note: for (b), backup slaves are receiving the broadcast ARP
2538 * request, not a reply. This request passes from the sending
2539 * slave through the L2 switch(es) to the receiving slave. Since
2540 * this is checking the request, sip/tip are swapped for
2543 * This is done to avoid endless looping when we can't reach the
2544 * arp_ip_target and fool ourselves with our own arp requests.
2546 if (bond_is_active_slave(slave
))
2547 bond_validate_arp(bond
, slave
, sip
, tip
);
2548 else if (curr_active_slave
&&
2549 time_after(slave_last_rx(bond
, curr_active_slave
),
2550 curr_active_slave
->last_link_up
))
2551 bond_validate_arp(bond
, slave
, tip
, sip
);
2552 else if (curr_arp_slave
&& (arp
->ar_op
== htons(ARPOP_REPLY
)) &&
2553 bond_time_in_interval(bond
,
2554 dev_trans_start(curr_arp_slave
->dev
), 1))
2555 bond_validate_arp(bond
, slave
, sip
, tip
);
2558 if (arp
!= (struct arphdr
*)skb
->data
)
2560 return RX_HANDLER_ANOTHER
;
2563 /* function to verify if we're in the arp_interval timeslice, returns true if
2564 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2565 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2567 static bool bond_time_in_interval(struct bonding
*bond
, unsigned long last_act
,
2570 int delta_in_ticks
= msecs_to_jiffies(bond
->params
.arp_interval
);
2572 return time_in_range(jiffies
,
2573 last_act
- delta_in_ticks
,
2574 last_act
+ mod
* delta_in_ticks
+ delta_in_ticks
/2);
2577 /* This function is called regularly to monitor each slave's link
2578 * ensuring that traffic is being sent and received when arp monitoring
2579 * is used in load-balancing mode. if the adapter has been dormant, then an
2580 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2581 * arp monitoring in active backup mode.
2583 static void bond_loadbalance_arp_mon(struct work_struct
*work
)
2585 struct bonding
*bond
= container_of(work
, struct bonding
,
2587 struct slave
*slave
, *oldcurrent
;
2588 struct list_head
*iter
;
2589 int do_failover
= 0, slave_state_changed
= 0;
2591 if (!bond_has_slaves(bond
))
2596 oldcurrent
= rcu_dereference(bond
->curr_active_slave
);
2597 /* see if any of the previous devices are up now (i.e. they have
2598 * xmt and rcv traffic). the curr_active_slave does not come into
2599 * the picture unless it is null. also, slave->last_link_up is not
2600 * needed here because we send an arp on each slave and give a slave
2601 * as long as it needs to get the tx/rx within the delta.
2602 * TODO: what about up/down delay in arp mode? it wasn't here before
2605 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2606 unsigned long trans_start
= dev_trans_start(slave
->dev
);
2608 slave
->new_link
= BOND_LINK_NOCHANGE
;
2610 if (slave
->link
!= BOND_LINK_UP
) {
2611 if (bond_time_in_interval(bond
, trans_start
, 1) &&
2612 bond_time_in_interval(bond
, slave
->last_rx
, 1)) {
2614 slave
->new_link
= BOND_LINK_UP
;
2615 slave_state_changed
= 1;
2617 /* primary_slave has no meaning in round-robin
2618 * mode. the window of a slave being up and
2619 * curr_active_slave being null after enslaving
2623 netdev_info(bond
->dev
, "link status definitely up for interface %s\n",
2627 netdev_info(bond
->dev
, "interface %s is now up\n",
2632 /* slave->link == BOND_LINK_UP */
2634 /* not all switches will respond to an arp request
2635 * when the source ip is 0, so don't take the link down
2636 * if we don't know our ip yet
2638 if (!bond_time_in_interval(bond
, trans_start
, 2) ||
2639 !bond_time_in_interval(bond
, slave
->last_rx
, 2)) {
2641 slave
->new_link
= BOND_LINK_DOWN
;
2642 slave_state_changed
= 1;
2644 if (slave
->link_failure_count
< UINT_MAX
)
2645 slave
->link_failure_count
++;
2647 netdev_info(bond
->dev
, "interface %s is now down\n",
2650 if (slave
== oldcurrent
)
2655 /* note: if switch is in round-robin mode, all links
2656 * must tx arp to ensure all links rx an arp - otherwise
2657 * links may oscillate or not come up at all; if switch is
2658 * in something like xor mode, there is nothing we can
2659 * do - all replies will be rx'ed on same link causing slaves
2660 * to be unstable during low/no traffic periods
2662 if (bond_slave_is_up(slave
))
2663 bond_arp_send_all(bond
, slave
);
2668 if (do_failover
|| slave_state_changed
) {
2669 if (!rtnl_trylock())
2672 bond_for_each_slave(bond
, slave
, iter
) {
2673 if (slave
->new_link
!= BOND_LINK_NOCHANGE
)
2674 slave
->link
= slave
->new_link
;
2677 if (slave_state_changed
) {
2678 bond_slave_state_change(bond
);
2679 if (BOND_MODE(bond
) == BOND_MODE_XOR
)
2680 bond_update_slave_arr(bond
, NULL
);
2684 bond_select_active_slave(bond
);
2685 unblock_netpoll_tx();
2691 if (bond
->params
.arp_interval
)
2692 queue_delayed_work(bond
->wq
, &bond
->arp_work
,
2693 msecs_to_jiffies(bond
->params
.arp_interval
));
2696 /* Called to inspect slaves for active-backup mode ARP monitor link state
2697 * changes. Sets new_link in slaves to specify what action should take
2698 * place for the slave. Returns 0 if no changes are found, >0 if changes
2699 * to link states must be committed.
2701 * Called with rcu_read_lock held.
2703 static int bond_ab_arp_inspect(struct bonding
*bond
)
2705 unsigned long trans_start
, last_rx
;
2706 struct list_head
*iter
;
2707 struct slave
*slave
;
2710 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2711 slave
->new_link
= BOND_LINK_NOCHANGE
;
2712 last_rx
= slave_last_rx(bond
, slave
);
2714 if (slave
->link
!= BOND_LINK_UP
) {
2715 if (bond_time_in_interval(bond
, last_rx
, 1)) {
2716 slave
->new_link
= BOND_LINK_UP
;
2722 /* Give slaves 2*delta after being enslaved or made
2723 * active. This avoids bouncing, as the last receive
2724 * times need a full ARP monitor cycle to be updated.
2726 if (bond_time_in_interval(bond
, slave
->last_link_up
, 2))
2729 /* Backup slave is down if:
2730 * - No current_arp_slave AND
2731 * - more than 3*delta since last receive AND
2732 * - the bond has an IP address
2734 * Note: a non-null current_arp_slave indicates
2735 * the curr_active_slave went down and we are
2736 * searching for a new one; under this condition
2737 * we only take the curr_active_slave down - this
2738 * gives each slave a chance to tx/rx traffic
2739 * before being taken out
2741 if (!bond_is_active_slave(slave
) &&
2742 !rcu_access_pointer(bond
->current_arp_slave
) &&
2743 !bond_time_in_interval(bond
, last_rx
, 3)) {
2744 slave
->new_link
= BOND_LINK_DOWN
;
2748 /* Active slave is down if:
2749 * - more than 2*delta since transmitting OR
2750 * - (more than 2*delta since receive AND
2751 * the bond has an IP address)
2753 trans_start
= dev_trans_start(slave
->dev
);
2754 if (bond_is_active_slave(slave
) &&
2755 (!bond_time_in_interval(bond
, trans_start
, 2) ||
2756 !bond_time_in_interval(bond
, last_rx
, 2))) {
2757 slave
->new_link
= BOND_LINK_DOWN
;
2765 /* Called to commit link state changes noted by inspection step of
2766 * active-backup mode ARP monitor.
2768 * Called with RTNL hold.
2770 static void bond_ab_arp_commit(struct bonding
*bond
)
2772 unsigned long trans_start
;
2773 struct list_head
*iter
;
2774 struct slave
*slave
;
2776 bond_for_each_slave(bond
, slave
, iter
) {
2777 switch (slave
->new_link
) {
2778 case BOND_LINK_NOCHANGE
:
2782 trans_start
= dev_trans_start(slave
->dev
);
2783 if (rtnl_dereference(bond
->curr_active_slave
) != slave
||
2784 (!rtnl_dereference(bond
->curr_active_slave
) &&
2785 bond_time_in_interval(bond
, trans_start
, 1))) {
2786 struct slave
*current_arp_slave
;
2788 current_arp_slave
= rtnl_dereference(bond
->current_arp_slave
);
2789 bond_set_slave_link_state(slave
, BOND_LINK_UP
,
2790 BOND_SLAVE_NOTIFY_NOW
);
2791 if (current_arp_slave
) {
2792 bond_set_slave_inactive_flags(
2794 BOND_SLAVE_NOTIFY_NOW
);
2795 RCU_INIT_POINTER(bond
->current_arp_slave
, NULL
);
2798 netdev_info(bond
->dev
, "link status definitely up for interface %s\n",
2801 if (!rtnl_dereference(bond
->curr_active_slave
) ||
2802 slave
== rtnl_dereference(bond
->primary_slave
))
2809 case BOND_LINK_DOWN
:
2810 if (slave
->link_failure_count
< UINT_MAX
)
2811 slave
->link_failure_count
++;
2813 bond_set_slave_link_state(slave
, BOND_LINK_DOWN
,
2814 BOND_SLAVE_NOTIFY_NOW
);
2815 bond_set_slave_inactive_flags(slave
,
2816 BOND_SLAVE_NOTIFY_NOW
);
2818 netdev_info(bond
->dev
, "link status definitely down for interface %s, disabling it\n",
2821 if (slave
== rtnl_dereference(bond
->curr_active_slave
)) {
2822 RCU_INIT_POINTER(bond
->current_arp_slave
, NULL
);
2829 netdev_err(bond
->dev
, "impossible: new_link %d on slave %s\n",
2830 slave
->new_link
, slave
->dev
->name
);
2836 bond_select_active_slave(bond
);
2837 unblock_netpoll_tx();
2840 bond_set_carrier(bond
);
2843 /* Send ARP probes for active-backup mode ARP monitor.
2845 * Called with rcu_read_lock held.
2847 static bool bond_ab_arp_probe(struct bonding
*bond
)
2849 struct slave
*slave
, *before
= NULL
, *new_slave
= NULL
,
2850 *curr_arp_slave
= rcu_dereference(bond
->current_arp_slave
),
2851 *curr_active_slave
= rcu_dereference(bond
->curr_active_slave
);
2852 struct list_head
*iter
;
2854 bool should_notify_rtnl
= BOND_SLAVE_NOTIFY_LATER
;
2856 if (curr_arp_slave
&& curr_active_slave
)
2857 netdev_info(bond
->dev
, "PROBE: c_arp %s && cas %s BAD\n",
2858 curr_arp_slave
->dev
->name
,
2859 curr_active_slave
->dev
->name
);
2861 if (curr_active_slave
) {
2862 bond_arp_send_all(bond
, curr_active_slave
);
2863 return should_notify_rtnl
;
2866 /* if we don't have a curr_active_slave, search for the next available
2867 * backup slave from the current_arp_slave and make it the candidate
2868 * for becoming the curr_active_slave
2871 if (!curr_arp_slave
) {
2872 curr_arp_slave
= bond_first_slave_rcu(bond
);
2873 if (!curr_arp_slave
)
2874 return should_notify_rtnl
;
2877 bond_set_slave_inactive_flags(curr_arp_slave
, BOND_SLAVE_NOTIFY_LATER
);
2879 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2880 if (!found
&& !before
&& bond_slave_is_up(slave
))
2883 if (found
&& !new_slave
&& bond_slave_is_up(slave
))
2885 /* if the link state is up at this point, we
2886 * mark it down - this can happen if we have
2887 * simultaneous link failures and
2888 * reselect_active_interface doesn't make this
2889 * one the current slave so it is still marked
2890 * up when it is actually down
2892 if (!bond_slave_is_up(slave
) && slave
->link
== BOND_LINK_UP
) {
2893 bond_set_slave_link_state(slave
, BOND_LINK_DOWN
,
2894 BOND_SLAVE_NOTIFY_LATER
);
2895 if (slave
->link_failure_count
< UINT_MAX
)
2896 slave
->link_failure_count
++;
2898 bond_set_slave_inactive_flags(slave
,
2899 BOND_SLAVE_NOTIFY_LATER
);
2901 netdev_info(bond
->dev
, "backup interface %s is now down\n",
2904 if (slave
== curr_arp_slave
)
2908 if (!new_slave
&& before
)
2914 bond_set_slave_link_state(new_slave
, BOND_LINK_BACK
,
2915 BOND_SLAVE_NOTIFY_LATER
);
2916 bond_set_slave_active_flags(new_slave
, BOND_SLAVE_NOTIFY_LATER
);
2917 bond_arp_send_all(bond
, new_slave
);
2918 new_slave
->last_link_up
= jiffies
;
2919 rcu_assign_pointer(bond
->current_arp_slave
, new_slave
);
2922 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2923 if (slave
->should_notify
|| slave
->should_notify_link
) {
2924 should_notify_rtnl
= BOND_SLAVE_NOTIFY_NOW
;
2928 return should_notify_rtnl
;
2931 static void bond_activebackup_arp_mon(struct work_struct
*work
)
2933 struct bonding
*bond
= container_of(work
, struct bonding
,
2935 bool should_notify_peers
= false;
2936 bool should_notify_rtnl
= false;
2939 delta_in_ticks
= msecs_to_jiffies(bond
->params
.arp_interval
);
2941 if (!bond_has_slaves(bond
))
2946 should_notify_peers
= bond_should_notify_peers(bond
);
2948 if (bond_ab_arp_inspect(bond
)) {
2951 /* Race avoidance with bond_close flush of workqueue */
2952 if (!rtnl_trylock()) {
2954 should_notify_peers
= false;
2958 bond_ab_arp_commit(bond
);
2964 should_notify_rtnl
= bond_ab_arp_probe(bond
);
2968 if (bond
->params
.arp_interval
)
2969 queue_delayed_work(bond
->wq
, &bond
->arp_work
, delta_in_ticks
);
2971 if (should_notify_peers
|| should_notify_rtnl
) {
2972 if (!rtnl_trylock())
2975 if (should_notify_peers
)
2976 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
,
2978 if (should_notify_rtnl
) {
2979 bond_slave_state_notify(bond
);
2980 bond_slave_link_notify(bond
);
2987 /*-------------------------- netdev event handling --------------------------*/
2989 /* Change device name */
2990 static int bond_event_changename(struct bonding
*bond
)
2992 bond_remove_proc_entry(bond
);
2993 bond_create_proc_entry(bond
);
2995 bond_debug_reregister(bond
);
3000 static int bond_master_netdev_event(unsigned long event
,
3001 struct net_device
*bond_dev
)
3003 struct bonding
*event_bond
= netdev_priv(bond_dev
);
3006 case NETDEV_CHANGENAME
:
3007 return bond_event_changename(event_bond
);
3008 case NETDEV_UNREGISTER
:
3009 bond_remove_proc_entry(event_bond
);
3011 case NETDEV_REGISTER
:
3012 bond_create_proc_entry(event_bond
);
3014 case NETDEV_NOTIFY_PEERS
:
3015 if (event_bond
->send_peer_notif
)
3016 event_bond
->send_peer_notif
--;
3025 static int bond_slave_netdev_event(unsigned long event
,
3026 struct net_device
*slave_dev
)
3028 struct slave
*slave
= bond_slave_get_rtnl(slave_dev
), *primary
;
3029 struct bonding
*bond
;
3030 struct net_device
*bond_dev
;
3032 /* A netdev event can be generated while enslaving a device
3033 * before netdev_rx_handler_register is called in which case
3034 * slave will be NULL
3038 bond_dev
= slave
->bond
->dev
;
3040 primary
= rtnl_dereference(bond
->primary_slave
);
3043 case NETDEV_UNREGISTER
:
3044 if (bond_dev
->type
!= ARPHRD_ETHER
)
3045 bond_release_and_destroy(bond_dev
, slave_dev
);
3047 bond_release(bond_dev
, slave_dev
);
3051 bond_update_speed_duplex(slave
);
3052 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
3053 bond_3ad_adapter_speed_duplex_changed(slave
);
3056 /* Refresh slave-array if applicable!
3057 * If the setup does not use miimon or arpmon (mode-specific!),
3058 * then these events will not cause the slave-array to be
3059 * refreshed. This will cause xmit to use a slave that is not
3060 * usable. Avoid such situation by refeshing the array at these
3061 * events. If these (miimon/arpmon) parameters are configured
3062 * then array gets refreshed twice and that should be fine!
3064 if (bond_mode_uses_xmit_hash(bond
))
3065 bond_update_slave_arr(bond
, NULL
);
3067 case NETDEV_CHANGEMTU
:
3068 /* TODO: Should slaves be allowed to
3069 * independently alter their MTU? For
3070 * an active-backup bond, slaves need
3071 * not be the same type of device, so
3072 * MTUs may vary. For other modes,
3073 * slaves arguably should have the
3074 * same MTUs. To do this, we'd need to
3075 * take over the slave's change_mtu
3076 * function for the duration of their
3080 case NETDEV_CHANGENAME
:
3081 /* we don't care if we don't have primary set */
3082 if (!bond_uses_primary(bond
) ||
3083 !bond
->params
.primary
[0])
3086 if (slave
== primary
) {
3087 /* slave's name changed - he's no longer primary */
3088 RCU_INIT_POINTER(bond
->primary_slave
, NULL
);
3089 } else if (!strcmp(slave_dev
->name
, bond
->params
.primary
)) {
3090 /* we have a new primary slave */
3091 rcu_assign_pointer(bond
->primary_slave
, slave
);
3092 } else { /* we didn't change primary - exit */
3096 netdev_info(bond
->dev
, "Primary slave changed to %s, reselecting active slave\n",
3097 primary
? slave_dev
->name
: "none");
3100 bond_select_active_slave(bond
);
3101 unblock_netpoll_tx();
3103 case NETDEV_FEAT_CHANGE
:
3104 bond_compute_features(bond
);
3106 case NETDEV_RESEND_IGMP
:
3107 /* Propagate to master device */
3108 call_netdevice_notifiers(event
, slave
->bond
->dev
);
3117 /* bond_netdev_event: handle netdev notifier chain events.
3119 * This function receives events for the netdev chain. The caller (an
3120 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3121 * locks for us to safely manipulate the slave devices (RTNL lock,
3124 static int bond_netdev_event(struct notifier_block
*this,
3125 unsigned long event
, void *ptr
)
3127 struct net_device
*event_dev
= netdev_notifier_info_to_dev(ptr
);
3129 netdev_dbg(event_dev
, "event: %lx\n", event
);
3131 if (!(event_dev
->priv_flags
& IFF_BONDING
))
3134 if (event_dev
->flags
& IFF_MASTER
) {
3135 netdev_dbg(event_dev
, "IFF_MASTER\n");
3136 return bond_master_netdev_event(event
, event_dev
);
3139 if (event_dev
->flags
& IFF_SLAVE
) {
3140 netdev_dbg(event_dev
, "IFF_SLAVE\n");
3141 return bond_slave_netdev_event(event
, event_dev
);
3147 static struct notifier_block bond_netdev_notifier
= {
3148 .notifier_call
= bond_netdev_event
,
3151 /*---------------------------- Hashing Policies -----------------------------*/
3153 /* L2 hash helper */
3154 static inline u32
bond_eth_hash(struct sk_buff
*skb
)
3156 struct ethhdr
*ep
, hdr_tmp
;
3158 ep
= skb_header_pointer(skb
, 0, sizeof(hdr_tmp
), &hdr_tmp
);
3160 return ep
->h_dest
[5] ^ ep
->h_source
[5] ^ ep
->h_proto
;
3164 /* Extract the appropriate headers based on bond's xmit policy */
3165 static bool bond_flow_dissect(struct bonding
*bond
, struct sk_buff
*skb
,
3166 struct flow_keys
*fk
)
3168 const struct ipv6hdr
*iph6
;
3169 const struct iphdr
*iph
;
3170 int noff
, proto
= -1;
3172 if (bond
->params
.xmit_policy
> BOND_XMIT_POLICY_LAYER23
)
3173 return skb_flow_dissect_flow_keys(skb
, fk
, 0);
3175 fk
->ports
.ports
= 0;
3176 noff
= skb_network_offset(skb
);
3177 if (skb
->protocol
== htons(ETH_P_IP
)) {
3178 if (unlikely(!pskb_may_pull(skb
, noff
+ sizeof(*iph
))))
3181 iph_to_flow_copy_v4addrs(fk
, iph
);
3182 noff
+= iph
->ihl
<< 2;
3183 if (!ip_is_fragment(iph
))
3184 proto
= iph
->protocol
;
3185 } else if (skb
->protocol
== htons(ETH_P_IPV6
)) {
3186 if (unlikely(!pskb_may_pull(skb
, noff
+ sizeof(*iph6
))))
3188 iph6
= ipv6_hdr(skb
);
3189 iph_to_flow_copy_v6addrs(fk
, iph6
);
3190 noff
+= sizeof(*iph6
);
3191 proto
= iph6
->nexthdr
;
3195 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_LAYER34
&& proto
>= 0)
3196 fk
->ports
.ports
= skb_flow_get_ports(skb
, noff
, proto
);
3202 * bond_xmit_hash - generate a hash value based on the xmit policy
3203 * @bond: bonding device
3204 * @skb: buffer to use for headers
3206 * This function will extract the necessary headers from the skb buffer and use
3207 * them to generate a hash based on the xmit_policy set in the bonding device
3209 u32
bond_xmit_hash(struct bonding
*bond
, struct sk_buff
*skb
)
3211 struct flow_keys flow
;
3214 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_ENCAP34
&&
3218 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_LAYER2
||
3219 !bond_flow_dissect(bond
, skb
, &flow
))
3220 return bond_eth_hash(skb
);
3222 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_LAYER23
||
3223 bond
->params
.xmit_policy
== BOND_XMIT_POLICY_ENCAP23
)
3224 hash
= bond_eth_hash(skb
);
3226 hash
= (__force u32
)flow
.ports
.ports
;
3227 hash
^= (__force u32
)flow_get_u32_dst(&flow
) ^
3228 (__force u32
)flow_get_u32_src(&flow
);
3229 hash
^= (hash
>> 16);
3230 hash
^= (hash
>> 8);
3235 /*-------------------------- Device entry points ----------------------------*/
3237 static void bond_work_init_all(struct bonding
*bond
)
3239 INIT_DELAYED_WORK(&bond
->mcast_work
,
3240 bond_resend_igmp_join_requests_delayed
);
3241 INIT_DELAYED_WORK(&bond
->alb_work
, bond_alb_monitor
);
3242 INIT_DELAYED_WORK(&bond
->mii_work
, bond_mii_monitor
);
3243 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
)
3244 INIT_DELAYED_WORK(&bond
->arp_work
, bond_activebackup_arp_mon
);
3246 INIT_DELAYED_WORK(&bond
->arp_work
, bond_loadbalance_arp_mon
);
3247 INIT_DELAYED_WORK(&bond
->ad_work
, bond_3ad_state_machine_handler
);
3248 INIT_DELAYED_WORK(&bond
->slave_arr_work
, bond_slave_arr_handler
);
3251 static void bond_work_cancel_all(struct bonding
*bond
)
3253 cancel_delayed_work_sync(&bond
->mii_work
);
3254 cancel_delayed_work_sync(&bond
->arp_work
);
3255 cancel_delayed_work_sync(&bond
->alb_work
);
3256 cancel_delayed_work_sync(&bond
->ad_work
);
3257 cancel_delayed_work_sync(&bond
->mcast_work
);
3258 cancel_delayed_work_sync(&bond
->slave_arr_work
);
3261 static int bond_open(struct net_device
*bond_dev
)
3263 struct bonding
*bond
= netdev_priv(bond_dev
);
3264 struct list_head
*iter
;
3265 struct slave
*slave
;
3267 /* reset slave->backup and slave->inactive */
3268 if (bond_has_slaves(bond
)) {
3269 bond_for_each_slave(bond
, slave
, iter
) {
3270 if (bond_uses_primary(bond
) &&
3271 slave
!= rcu_access_pointer(bond
->curr_active_slave
)) {
3272 bond_set_slave_inactive_flags(slave
,
3273 BOND_SLAVE_NOTIFY_NOW
);
3274 } else if (BOND_MODE(bond
) != BOND_MODE_8023AD
) {
3275 bond_set_slave_active_flags(slave
,
3276 BOND_SLAVE_NOTIFY_NOW
);
3281 bond_work_init_all(bond
);
3283 if (bond_is_lb(bond
)) {
3284 /* bond_alb_initialize must be called before the timer
3287 if (bond_alb_initialize(bond
, (BOND_MODE(bond
) == BOND_MODE_ALB
)))
3289 if (bond
->params
.tlb_dynamic_lb
)
3290 queue_delayed_work(bond
->wq
, &bond
->alb_work
, 0);
3293 if (bond
->params
.miimon
) /* link check interval, in milliseconds. */
3294 queue_delayed_work(bond
->wq
, &bond
->mii_work
, 0);
3296 if (bond
->params
.arp_interval
) { /* arp interval, in milliseconds. */
3297 queue_delayed_work(bond
->wq
, &bond
->arp_work
, 0);
3298 bond
->recv_probe
= bond_arp_rcv
;
3301 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
3302 queue_delayed_work(bond
->wq
, &bond
->ad_work
, 0);
3303 /* register to receive LACPDUs */
3304 bond
->recv_probe
= bond_3ad_lacpdu_recv
;
3305 bond_3ad_initiate_agg_selection(bond
, 1);
3308 if (bond_mode_uses_xmit_hash(bond
))
3309 bond_update_slave_arr(bond
, NULL
);
3314 static int bond_close(struct net_device
*bond_dev
)
3316 struct bonding
*bond
= netdev_priv(bond_dev
);
3318 bond_work_cancel_all(bond
);
3319 bond
->send_peer_notif
= 0;
3320 if (bond_is_lb(bond
))
3321 bond_alb_deinitialize(bond
);
3322 bond
->recv_probe
= NULL
;
3327 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3328 * that some drivers can provide 32bit values only.
3330 static void bond_fold_stats(struct rtnl_link_stats64
*_res
,
3331 const struct rtnl_link_stats64
*_new
,
3332 const struct rtnl_link_stats64
*_old
)
3334 const u64
*new = (const u64
*)_new
;
3335 const u64
*old
= (const u64
*)_old
;
3336 u64
*res
= (u64
*)_res
;
3339 for (i
= 0; i
< sizeof(*_res
) / sizeof(u64
); i
++) {
3342 s64 delta
= nv
- ov
;
3344 /* detects if this particular field is 32bit only */
3345 if (((nv
| ov
) >> 32) == 0)
3346 delta
= (s64
)(s32
)((u32
)nv
- (u32
)ov
);
3348 /* filter anomalies, some drivers reset their stats
3349 * at down/up events.
3356 static struct rtnl_link_stats64
*bond_get_stats(struct net_device
*bond_dev
,
3357 struct rtnl_link_stats64
*stats
)
3359 struct bonding
*bond
= netdev_priv(bond_dev
);
3360 struct rtnl_link_stats64 temp
;
3361 struct list_head
*iter
;
3362 struct slave
*slave
;
3364 spin_lock(&bond
->stats_lock
);
3365 memcpy(stats
, &bond
->bond_stats
, sizeof(*stats
));
3368 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3369 const struct rtnl_link_stats64
*new =
3370 dev_get_stats(slave
->dev
, &temp
);
3372 bond_fold_stats(stats
, new, &slave
->slave_stats
);
3374 /* save off the slave stats for the next run */
3375 memcpy(&slave
->slave_stats
, new, sizeof(*new));
3379 memcpy(&bond
->bond_stats
, stats
, sizeof(*stats
));
3380 spin_unlock(&bond
->stats_lock
);
3385 static int bond_do_ioctl(struct net_device
*bond_dev
, struct ifreq
*ifr
, int cmd
)
3387 struct bonding
*bond
= netdev_priv(bond_dev
);
3388 struct net_device
*slave_dev
= NULL
;
3389 struct ifbond k_binfo
;
3390 struct ifbond __user
*u_binfo
= NULL
;
3391 struct ifslave k_sinfo
;
3392 struct ifslave __user
*u_sinfo
= NULL
;
3393 struct mii_ioctl_data
*mii
= NULL
;
3394 struct bond_opt_value newval
;
3398 netdev_dbg(bond_dev
, "bond_ioctl: cmd=%d\n", cmd
);
3409 /* We do this again just in case we were called by SIOCGMIIREG
3410 * instead of SIOCGMIIPHY.
3416 if (mii
->reg_num
== 1) {
3418 if (netif_carrier_ok(bond
->dev
))
3419 mii
->val_out
= BMSR_LSTATUS
;
3423 case BOND_INFO_QUERY_OLD
:
3424 case SIOCBONDINFOQUERY
:
3425 u_binfo
= (struct ifbond __user
*)ifr
->ifr_data
;
3427 if (copy_from_user(&k_binfo
, u_binfo
, sizeof(ifbond
)))
3430 res
= bond_info_query(bond_dev
, &k_binfo
);
3432 copy_to_user(u_binfo
, &k_binfo
, sizeof(ifbond
)))
3436 case BOND_SLAVE_INFO_QUERY_OLD
:
3437 case SIOCBONDSLAVEINFOQUERY
:
3438 u_sinfo
= (struct ifslave __user
*)ifr
->ifr_data
;
3440 if (copy_from_user(&k_sinfo
, u_sinfo
, sizeof(ifslave
)))
3443 res
= bond_slave_info_query(bond_dev
, &k_sinfo
);
3445 copy_to_user(u_sinfo
, &k_sinfo
, sizeof(ifslave
)))
3453 net
= dev_net(bond_dev
);
3455 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
3458 slave_dev
= __dev_get_by_name(net
, ifr
->ifr_slave
);
3460 netdev_dbg(bond_dev
, "slave_dev=%p:\n", slave_dev
);
3465 netdev_dbg(bond_dev
, "slave_dev->name=%s:\n", slave_dev
->name
);
3467 case BOND_ENSLAVE_OLD
:
3468 case SIOCBONDENSLAVE
:
3469 res
= bond_enslave(bond_dev
, slave_dev
);
3471 case BOND_RELEASE_OLD
:
3472 case SIOCBONDRELEASE
:
3473 res
= bond_release(bond_dev
, slave_dev
);
3475 case BOND_SETHWADDR_OLD
:
3476 case SIOCBONDSETHWADDR
:
3477 bond_set_dev_addr(bond_dev
, slave_dev
);
3480 case BOND_CHANGE_ACTIVE_OLD
:
3481 case SIOCBONDCHANGEACTIVE
:
3482 bond_opt_initstr(&newval
, slave_dev
->name
);
3483 res
= __bond_opt_set(bond
, BOND_OPT_ACTIVE_SLAVE
, &newval
);
3492 static void bond_change_rx_flags(struct net_device
*bond_dev
, int change
)
3494 struct bonding
*bond
= netdev_priv(bond_dev
);
3496 if (change
& IFF_PROMISC
)
3497 bond_set_promiscuity(bond
,
3498 bond_dev
->flags
& IFF_PROMISC
? 1 : -1);
3500 if (change
& IFF_ALLMULTI
)
3501 bond_set_allmulti(bond
,
3502 bond_dev
->flags
& IFF_ALLMULTI
? 1 : -1);
3505 static void bond_set_rx_mode(struct net_device
*bond_dev
)
3507 struct bonding
*bond
= netdev_priv(bond_dev
);
3508 struct list_head
*iter
;
3509 struct slave
*slave
;
3512 if (bond_uses_primary(bond
)) {
3513 slave
= rcu_dereference(bond
->curr_active_slave
);
3515 dev_uc_sync(slave
->dev
, bond_dev
);
3516 dev_mc_sync(slave
->dev
, bond_dev
);
3519 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3520 dev_uc_sync_multiple(slave
->dev
, bond_dev
);
3521 dev_mc_sync_multiple(slave
->dev
, bond_dev
);
3527 static int bond_neigh_init(struct neighbour
*n
)
3529 struct bonding
*bond
= netdev_priv(n
->dev
);
3530 const struct net_device_ops
*slave_ops
;
3531 struct neigh_parms parms
;
3532 struct slave
*slave
;
3535 slave
= bond_first_slave(bond
);
3538 slave_ops
= slave
->dev
->netdev_ops
;
3539 if (!slave_ops
->ndo_neigh_setup
)
3542 parms
.neigh_setup
= NULL
;
3543 parms
.neigh_cleanup
= NULL
;
3544 ret
= slave_ops
->ndo_neigh_setup(slave
->dev
, &parms
);
3548 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3549 * after the last slave has been detached. Assumes that all slaves
3550 * utilize the same neigh_cleanup (true at this writing as only user
3553 n
->parms
->neigh_cleanup
= parms
.neigh_cleanup
;
3555 if (!parms
.neigh_setup
)
3558 return parms
.neigh_setup(n
);
3561 /* The bonding ndo_neigh_setup is called at init time beofre any
3562 * slave exists. So we must declare proxy setup function which will
3563 * be used at run time to resolve the actual slave neigh param setup.
3565 * It's also called by master devices (such as vlans) to setup their
3566 * underlying devices. In that case - do nothing, we're already set up from
3569 static int bond_neigh_setup(struct net_device
*dev
,
3570 struct neigh_parms
*parms
)
3572 /* modify only our neigh_parms */
3573 if (parms
->dev
== dev
)
3574 parms
->neigh_setup
= bond_neigh_init
;
3579 /* Change the MTU of all of a master's slaves to match the master */
3580 static int bond_change_mtu(struct net_device
*bond_dev
, int new_mtu
)
3582 struct bonding
*bond
= netdev_priv(bond_dev
);
3583 struct slave
*slave
, *rollback_slave
;
3584 struct list_head
*iter
;
3587 netdev_dbg(bond_dev
, "bond=%p, new_mtu=%d\n", bond
, new_mtu
);
3589 bond_for_each_slave(bond
, slave
, iter
) {
3590 netdev_dbg(bond_dev
, "s %p c_m %p\n",
3591 slave
, slave
->dev
->netdev_ops
->ndo_change_mtu
);
3593 res
= dev_set_mtu(slave
->dev
, new_mtu
);
3596 /* If we failed to set the slave's mtu to the new value
3597 * we must abort the operation even in ACTIVE_BACKUP
3598 * mode, because if we allow the backup slaves to have
3599 * different mtu values than the active slave we'll
3600 * need to change their mtu when doing a failover. That
3601 * means changing their mtu from timer context, which
3602 * is probably not a good idea.
3604 netdev_dbg(bond_dev
, "err %d %s\n", res
,
3610 bond_dev
->mtu
= new_mtu
;
3615 /* unwind from head to the slave that failed */
3616 bond_for_each_slave(bond
, rollback_slave
, iter
) {
3619 if (rollback_slave
== slave
)
3622 tmp_res
= dev_set_mtu(rollback_slave
->dev
, bond_dev
->mtu
);
3624 netdev_dbg(bond_dev
, "unwind err %d dev %s\n",
3625 tmp_res
, rollback_slave
->dev
->name
);
3632 /* Change HW address
3634 * Note that many devices must be down to change the HW address, and
3635 * downing the master releases all slaves. We can make bonds full of
3636 * bonding devices to test this, however.
3638 static int bond_set_mac_address(struct net_device
*bond_dev
, void *addr
)
3640 struct bonding
*bond
= netdev_priv(bond_dev
);
3641 struct slave
*slave
, *rollback_slave
;
3642 struct sockaddr
*sa
= addr
, tmp_sa
;
3643 struct list_head
*iter
;
3646 if (BOND_MODE(bond
) == BOND_MODE_ALB
)
3647 return bond_alb_set_mac_address(bond_dev
, addr
);
3650 netdev_dbg(bond_dev
, "bond=%p\n", bond
);
3652 /* If fail_over_mac is enabled, do nothing and return success.
3653 * Returning an error causes ifenslave to fail.
3655 if (bond
->params
.fail_over_mac
&&
3656 BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
)
3659 if (!is_valid_ether_addr(sa
->sa_data
))
3660 return -EADDRNOTAVAIL
;
3662 bond_for_each_slave(bond
, slave
, iter
) {
3663 netdev_dbg(bond_dev
, "slave %p %s\n", slave
, slave
->dev
->name
);
3664 res
= dev_set_mac_address(slave
->dev
, addr
);
3666 /* TODO: consider downing the slave
3668 * User should expect communications
3669 * breakage anyway until ARP finish
3672 netdev_dbg(bond_dev
, "err %d %s\n", res
, slave
->dev
->name
);
3678 memcpy(bond_dev
->dev_addr
, sa
->sa_data
, bond_dev
->addr_len
);
3682 memcpy(tmp_sa
.sa_data
, bond_dev
->dev_addr
, bond_dev
->addr_len
);
3683 tmp_sa
.sa_family
= bond_dev
->type
;
3685 /* unwind from head to the slave that failed */
3686 bond_for_each_slave(bond
, rollback_slave
, iter
) {
3689 if (rollback_slave
== slave
)
3692 tmp_res
= dev_set_mac_address(rollback_slave
->dev
, &tmp_sa
);
3694 netdev_dbg(bond_dev
, "unwind err %d dev %s\n",
3695 tmp_res
, rollback_slave
->dev
->name
);
3703 * bond_xmit_slave_id - transmit skb through slave with slave_id
3704 * @bond: bonding device that is transmitting
3705 * @skb: buffer to transmit
3706 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3708 * This function tries to transmit through slave with slave_id but in case
3709 * it fails, it tries to find the first available slave for transmission.
3710 * The skb is consumed in all cases, thus the function is void.
3712 static void bond_xmit_slave_id(struct bonding
*bond
, struct sk_buff
*skb
, int slave_id
)
3714 struct list_head
*iter
;
3715 struct slave
*slave
;
3718 /* Here we start from the slave with slave_id */
3719 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3721 if (bond_slave_can_tx(slave
)) {
3722 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3728 /* Here we start from the first slave up to slave_id */
3730 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3733 if (bond_slave_can_tx(slave
)) {
3734 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3738 /* no slave that can tx has been found */
3739 bond_tx_drop(bond
->dev
, skb
);
3743 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3744 * @bond: bonding device to use
3746 * Based on the value of the bonding device's packets_per_slave parameter
3747 * this function generates a slave id, which is usually used as the next
3748 * slave to transmit through.
3750 static u32
bond_rr_gen_slave_id(struct bonding
*bond
)
3753 struct reciprocal_value reciprocal_packets_per_slave
;
3754 int packets_per_slave
= bond
->params
.packets_per_slave
;
3756 switch (packets_per_slave
) {
3758 slave_id
= prandom_u32();
3761 slave_id
= bond
->rr_tx_counter
;
3764 reciprocal_packets_per_slave
=
3765 bond
->params
.reciprocal_packets_per_slave
;
3766 slave_id
= reciprocal_divide(bond
->rr_tx_counter
,
3767 reciprocal_packets_per_slave
);
3770 bond
->rr_tx_counter
++;
3775 static int bond_xmit_roundrobin(struct sk_buff
*skb
, struct net_device
*bond_dev
)
3777 struct bonding
*bond
= netdev_priv(bond_dev
);
3778 struct iphdr
*iph
= ip_hdr(skb
);
3779 struct slave
*slave
;
3782 /* Start with the curr_active_slave that joined the bond as the
3783 * default for sending IGMP traffic. For failover purposes one
3784 * needs to maintain some consistency for the interface that will
3785 * send the join/membership reports. The curr_active_slave found
3786 * will send all of this type of traffic.
3788 if (iph
->protocol
== IPPROTO_IGMP
&& skb
->protocol
== htons(ETH_P_IP
)) {
3789 slave
= rcu_dereference(bond
->curr_active_slave
);
3791 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3793 bond_xmit_slave_id(bond
, skb
, 0);
3795 int slave_cnt
= ACCESS_ONCE(bond
->slave_cnt
);
3797 if (likely(slave_cnt
)) {
3798 slave_id
= bond_rr_gen_slave_id(bond
);
3799 bond_xmit_slave_id(bond
, skb
, slave_id
% slave_cnt
);
3801 bond_tx_drop(bond_dev
, skb
);
3805 return NETDEV_TX_OK
;
3808 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3809 * the bond has a usable interface.
3811 static int bond_xmit_activebackup(struct sk_buff
*skb
, struct net_device
*bond_dev
)
3813 struct bonding
*bond
= netdev_priv(bond_dev
);
3814 struct slave
*slave
;
3816 slave
= rcu_dereference(bond
->curr_active_slave
);
3818 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3820 bond_tx_drop(bond_dev
, skb
);
3822 return NETDEV_TX_OK
;
3825 /* Use this to update slave_array when (a) it's not appropriate to update
3826 * slave_array right away (note that update_slave_array() may sleep)
3827 * and / or (b) RTNL is not held.
3829 void bond_slave_arr_work_rearm(struct bonding
*bond
, unsigned long delay
)
3831 queue_delayed_work(bond
->wq
, &bond
->slave_arr_work
, delay
);
3834 /* Slave array work handler. Holds only RTNL */
3835 static void bond_slave_arr_handler(struct work_struct
*work
)
3837 struct bonding
*bond
= container_of(work
, struct bonding
,
3838 slave_arr_work
.work
);
3841 if (!rtnl_trylock())
3844 ret
= bond_update_slave_arr(bond
, NULL
);
3847 pr_warn_ratelimited("Failed to update slave array from WT\n");
3853 bond_slave_arr_work_rearm(bond
, 1);
3856 /* Build the usable slaves array in control path for modes that use xmit-hash
3857 * to determine the slave interface -
3858 * (a) BOND_MODE_8023AD
3860 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3862 * The caller is expected to hold RTNL only and NO other lock!
3864 int bond_update_slave_arr(struct bonding
*bond
, struct slave
*skipslave
)
3866 struct slave
*slave
;
3867 struct list_head
*iter
;
3868 struct bond_up_slave
*new_arr
, *old_arr
;
3872 #ifdef CONFIG_LOCKDEP
3873 WARN_ON(lockdep_is_held(&bond
->mode_lock
));
3876 new_arr
= kzalloc(offsetof(struct bond_up_slave
, arr
[bond
->slave_cnt
]),
3880 pr_err("Failed to build slave-array.\n");
3883 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
3884 struct ad_info ad_info
;
3886 if (bond_3ad_get_active_agg_info(bond
, &ad_info
)) {
3887 pr_debug("bond_3ad_get_active_agg_info failed\n");
3888 kfree_rcu(new_arr
, rcu
);
3889 /* No active aggragator means it's not safe to use
3890 * the previous array.
3892 old_arr
= rtnl_dereference(bond
->slave_arr
);
3894 RCU_INIT_POINTER(bond
->slave_arr
, NULL
);
3895 kfree_rcu(old_arr
, rcu
);
3899 agg_id
= ad_info
.aggregator_id
;
3901 bond_for_each_slave(bond
, slave
, iter
) {
3902 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
3903 struct aggregator
*agg
;
3905 agg
= SLAVE_AD_INFO(slave
)->port
.aggregator
;
3906 if (!agg
|| agg
->aggregator_identifier
!= agg_id
)
3909 if (!bond_slave_can_tx(slave
))
3911 if (skipslave
== slave
)
3913 new_arr
->arr
[new_arr
->count
++] = slave
;
3916 old_arr
= rtnl_dereference(bond
->slave_arr
);
3917 rcu_assign_pointer(bond
->slave_arr
, new_arr
);
3919 kfree_rcu(old_arr
, rcu
);
3921 if (ret
!= 0 && skipslave
) {
3924 /* Rare situation where caller has asked to skip a specific
3925 * slave but allocation failed (most likely!). BTW this is
3926 * only possible when the call is initiated from
3927 * __bond_release_one(). In this situation; overwrite the
3928 * skipslave entry in the array with the last entry from the
3929 * array to avoid a situation where the xmit path may choose
3930 * this to-be-skipped slave to send a packet out.
3932 old_arr
= rtnl_dereference(bond
->slave_arr
);
3933 for (idx
= 0; idx
< old_arr
->count
; idx
++) {
3934 if (skipslave
== old_arr
->arr
[idx
]) {
3936 old_arr
->arr
[old_arr
->count
-1];
3945 /* Use this Xmit function for 3AD as well as XOR modes. The current
3946 * usable slave array is formed in the control path. The xmit function
3947 * just calculates hash and sends the packet out.
3949 static int bond_3ad_xor_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
3951 struct bonding
*bond
= netdev_priv(dev
);
3952 struct slave
*slave
;
3953 struct bond_up_slave
*slaves
;
3956 slaves
= rcu_dereference(bond
->slave_arr
);
3957 count
= slaves
? ACCESS_ONCE(slaves
->count
) : 0;
3958 if (likely(count
)) {
3959 slave
= slaves
->arr
[bond_xmit_hash(bond
, skb
) % count
];
3960 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3962 bond_tx_drop(dev
, skb
);
3965 return NETDEV_TX_OK
;
3968 /* in broadcast mode, we send everything to all usable interfaces. */
3969 static int bond_xmit_broadcast(struct sk_buff
*skb
, struct net_device
*bond_dev
)
3971 struct bonding
*bond
= netdev_priv(bond_dev
);
3972 struct slave
*slave
= NULL
;
3973 struct list_head
*iter
;
3975 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3976 if (bond_is_last_slave(bond
, slave
))
3978 if (bond_slave_is_up(slave
) && slave
->link
== BOND_LINK_UP
) {
3979 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
3982 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3983 bond_dev
->name
, __func__
);
3986 bond_dev_queue_xmit(bond
, skb2
, slave
->dev
);
3989 if (slave
&& bond_slave_is_up(slave
) && slave
->link
== BOND_LINK_UP
)
3990 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3992 bond_tx_drop(bond_dev
, skb
);
3994 return NETDEV_TX_OK
;
3997 /*------------------------- Device initialization ---------------------------*/
3999 /* Lookup the slave that corresponds to a qid */
4000 static inline int bond_slave_override(struct bonding
*bond
,
4001 struct sk_buff
*skb
)
4003 struct slave
*slave
= NULL
;
4004 struct list_head
*iter
;
4006 if (!skb
->queue_mapping
)
4009 /* Find out if any slaves have the same mapping as this skb. */
4010 bond_for_each_slave_rcu(bond
, slave
, iter
) {
4011 if (slave
->queue_id
== skb
->queue_mapping
) {
4012 if (bond_slave_is_up(slave
) &&
4013 slave
->link
== BOND_LINK_UP
) {
4014 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
4017 /* If the slave isn't UP, use default transmit policy. */
4026 static u16
bond_select_queue(struct net_device
*dev
, struct sk_buff
*skb
,
4027 void *accel_priv
, select_queue_fallback_t fallback
)
4029 /* This helper function exists to help dev_pick_tx get the correct
4030 * destination queue. Using a helper function skips a call to
4031 * skb_tx_hash and will put the skbs in the queue we expect on their
4032 * way down to the bonding driver.
4034 u16 txq
= skb_rx_queue_recorded(skb
) ? skb_get_rx_queue(skb
) : 0;
4036 /* Save the original txq to restore before passing to the driver */
4037 qdisc_skb_cb(skb
)->slave_dev_queue_mapping
= skb
->queue_mapping
;
4039 if (unlikely(txq
>= dev
->real_num_tx_queues
)) {
4041 txq
-= dev
->real_num_tx_queues
;
4042 } while (txq
>= dev
->real_num_tx_queues
);
4047 static netdev_tx_t
__bond_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
4049 struct bonding
*bond
= netdev_priv(dev
);
4051 if (bond_should_override_tx_queue(bond
) &&
4052 !bond_slave_override(bond
, skb
))
4053 return NETDEV_TX_OK
;
4055 switch (BOND_MODE(bond
)) {
4056 case BOND_MODE_ROUNDROBIN
:
4057 return bond_xmit_roundrobin(skb
, dev
);
4058 case BOND_MODE_ACTIVEBACKUP
:
4059 return bond_xmit_activebackup(skb
, dev
);
4060 case BOND_MODE_8023AD
:
4062 return bond_3ad_xor_xmit(skb
, dev
);
4063 case BOND_MODE_BROADCAST
:
4064 return bond_xmit_broadcast(skb
, dev
);
4066 return bond_alb_xmit(skb
, dev
);
4068 return bond_tlb_xmit(skb
, dev
);
4070 /* Should never happen, mode already checked */
4071 netdev_err(dev
, "Unknown bonding mode %d\n", BOND_MODE(bond
));
4073 bond_tx_drop(dev
, skb
);
4074 return NETDEV_TX_OK
;
4078 static netdev_tx_t
bond_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
4080 struct bonding
*bond
= netdev_priv(dev
);
4081 netdev_tx_t ret
= NETDEV_TX_OK
;
4083 /* If we risk deadlock from transmitting this in the
4084 * netpoll path, tell netpoll to queue the frame for later tx
4086 if (unlikely(is_netpoll_tx_blocked(dev
)))
4087 return NETDEV_TX_BUSY
;
4090 if (bond_has_slaves(bond
))
4091 ret
= __bond_start_xmit(skb
, dev
);
4093 bond_tx_drop(dev
, skb
);
4099 static int bond_ethtool_get_settings(struct net_device
*bond_dev
,
4100 struct ethtool_cmd
*ecmd
)
4102 struct bonding
*bond
= netdev_priv(bond_dev
);
4103 unsigned long speed
= 0;
4104 struct list_head
*iter
;
4105 struct slave
*slave
;
4107 ecmd
->duplex
= DUPLEX_UNKNOWN
;
4108 ecmd
->port
= PORT_OTHER
;
4110 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4111 * do not need to check mode. Though link speed might not represent
4112 * the true receive or transmit bandwidth (not all modes are symmetric)
4113 * this is an accurate maximum.
4115 bond_for_each_slave(bond
, slave
, iter
) {
4116 if (bond_slave_can_tx(slave
)) {
4117 if (slave
->speed
!= SPEED_UNKNOWN
)
4118 speed
+= slave
->speed
;
4119 if (ecmd
->duplex
== DUPLEX_UNKNOWN
&&
4120 slave
->duplex
!= DUPLEX_UNKNOWN
)
4121 ecmd
->duplex
= slave
->duplex
;
4124 ethtool_cmd_speed_set(ecmd
, speed
? : SPEED_UNKNOWN
);
4129 static void bond_ethtool_get_drvinfo(struct net_device
*bond_dev
,
4130 struct ethtool_drvinfo
*drvinfo
)
4132 strlcpy(drvinfo
->driver
, DRV_NAME
, sizeof(drvinfo
->driver
));
4133 strlcpy(drvinfo
->version
, DRV_VERSION
, sizeof(drvinfo
->version
));
4134 snprintf(drvinfo
->fw_version
, sizeof(drvinfo
->fw_version
), "%d",
4138 static const struct ethtool_ops bond_ethtool_ops
= {
4139 .get_drvinfo
= bond_ethtool_get_drvinfo
,
4140 .get_settings
= bond_ethtool_get_settings
,
4141 .get_link
= ethtool_op_get_link
,
4144 static const struct net_device_ops bond_netdev_ops
= {
4145 .ndo_init
= bond_init
,
4146 .ndo_uninit
= bond_uninit
,
4147 .ndo_open
= bond_open
,
4148 .ndo_stop
= bond_close
,
4149 .ndo_start_xmit
= bond_start_xmit
,
4150 .ndo_select_queue
= bond_select_queue
,
4151 .ndo_get_stats64
= bond_get_stats
,
4152 .ndo_do_ioctl
= bond_do_ioctl
,
4153 .ndo_change_rx_flags
= bond_change_rx_flags
,
4154 .ndo_set_rx_mode
= bond_set_rx_mode
,
4155 .ndo_change_mtu
= bond_change_mtu
,
4156 .ndo_set_mac_address
= bond_set_mac_address
,
4157 .ndo_neigh_setup
= bond_neigh_setup
,
4158 .ndo_vlan_rx_add_vid
= bond_vlan_rx_add_vid
,
4159 .ndo_vlan_rx_kill_vid
= bond_vlan_rx_kill_vid
,
4160 #ifdef CONFIG_NET_POLL_CONTROLLER
4161 .ndo_netpoll_setup
= bond_netpoll_setup
,
4162 .ndo_netpoll_cleanup
= bond_netpoll_cleanup
,
4163 .ndo_poll_controller
= bond_poll_controller
,
4165 .ndo_add_slave
= bond_enslave
,
4166 .ndo_del_slave
= bond_release
,
4167 .ndo_fix_features
= bond_fix_features
,
4168 .ndo_neigh_construct
= netdev_default_l2upper_neigh_construct
,
4169 .ndo_neigh_destroy
= netdev_default_l2upper_neigh_destroy
,
4170 .ndo_bridge_setlink
= switchdev_port_bridge_setlink
,
4171 .ndo_bridge_getlink
= switchdev_port_bridge_getlink
,
4172 .ndo_bridge_dellink
= switchdev_port_bridge_dellink
,
4173 .ndo_fdb_add
= switchdev_port_fdb_add
,
4174 .ndo_fdb_del
= switchdev_port_fdb_del
,
4175 .ndo_fdb_dump
= switchdev_port_fdb_dump
,
4176 .ndo_features_check
= passthru_features_check
,
4179 static const struct device_type bond_type
= {
4183 static void bond_destructor(struct net_device
*bond_dev
)
4185 struct bonding
*bond
= netdev_priv(bond_dev
);
4187 destroy_workqueue(bond
->wq
);
4188 free_netdev(bond_dev
);
4191 void bond_setup(struct net_device
*bond_dev
)
4193 struct bonding
*bond
= netdev_priv(bond_dev
);
4195 spin_lock_init(&bond
->mode_lock
);
4196 spin_lock_init(&bond
->stats_lock
);
4197 bond
->params
= bonding_defaults
;
4199 /* Initialize pointers */
4200 bond
->dev
= bond_dev
;
4202 /* Initialize the device entry points */
4203 ether_setup(bond_dev
);
4204 bond_dev
->netdev_ops
= &bond_netdev_ops
;
4205 bond_dev
->ethtool_ops
= &bond_ethtool_ops
;
4207 bond_dev
->destructor
= bond_destructor
;
4209 SET_NETDEV_DEVTYPE(bond_dev
, &bond_type
);
4211 /* Initialize the device options */
4212 bond_dev
->flags
|= IFF_MASTER
;
4213 bond_dev
->priv_flags
|= IFF_BONDING
| IFF_UNICAST_FLT
| IFF_NO_QUEUE
;
4214 bond_dev
->priv_flags
&= ~(IFF_XMIT_DST_RELEASE
| IFF_TX_SKB_SHARING
);
4216 /* don't acquire bond device's netif_tx_lock when transmitting */
4217 bond_dev
->features
|= NETIF_F_LLTX
;
4219 /* By default, we declare the bond to be fully
4220 * VLAN hardware accelerated capable. Special
4221 * care is taken in the various xmit functions
4222 * when there are slaves that are not hw accel
4226 /* Don't allow bond devices to change network namespaces. */
4227 bond_dev
->features
|= NETIF_F_NETNS_LOCAL
;
4229 bond_dev
->hw_features
= BOND_VLAN_FEATURES
|
4230 NETIF_F_HW_VLAN_CTAG_TX
|
4231 NETIF_F_HW_VLAN_CTAG_RX
|
4232 NETIF_F_HW_VLAN_CTAG_FILTER
;
4234 bond_dev
->hw_features
|= NETIF_F_GSO_ENCAP_ALL
;
4235 bond_dev
->features
|= bond_dev
->hw_features
;
4238 /* Destroy a bonding device.
4239 * Must be under rtnl_lock when this function is called.
4241 static void bond_uninit(struct net_device
*bond_dev
)
4243 struct bonding
*bond
= netdev_priv(bond_dev
);
4244 struct list_head
*iter
;
4245 struct slave
*slave
;
4246 struct bond_up_slave
*arr
;
4248 bond_netpoll_cleanup(bond_dev
);
4250 /* Release the bonded slaves */
4251 bond_for_each_slave(bond
, slave
, iter
)
4252 __bond_release_one(bond_dev
, slave
->dev
, true);
4253 netdev_info(bond_dev
, "Released all slaves\n");
4255 arr
= rtnl_dereference(bond
->slave_arr
);
4257 RCU_INIT_POINTER(bond
->slave_arr
, NULL
);
4258 kfree_rcu(arr
, rcu
);
4261 list_del(&bond
->bond_list
);
4263 bond_debug_unregister(bond
);
4266 /*------------------------- Module initialization ---------------------------*/
4268 static int bond_check_params(struct bond_params
*params
)
4270 int arp_validate_value
, fail_over_mac_value
, primary_reselect_value
, i
;
4271 struct bond_opt_value newval
;
4272 const struct bond_opt_value
*valptr
;
4273 int arp_all_targets_value
;
4274 u16 ad_actor_sys_prio
= 0;
4275 u16 ad_user_port_key
= 0;
4277 /* Convert string parameters. */
4279 bond_opt_initstr(&newval
, mode
);
4280 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_MODE
), &newval
);
4282 pr_err("Error: Invalid bonding mode \"%s\"\n", mode
);
4285 bond_mode
= valptr
->value
;
4288 if (xmit_hash_policy
) {
4289 if ((bond_mode
!= BOND_MODE_XOR
) &&
4290 (bond_mode
!= BOND_MODE_8023AD
) &&
4291 (bond_mode
!= BOND_MODE_TLB
)) {
4292 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4293 bond_mode_name(bond_mode
));
4295 bond_opt_initstr(&newval
, xmit_hash_policy
);
4296 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH
),
4299 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4303 xmit_hashtype
= valptr
->value
;
4308 if (bond_mode
!= BOND_MODE_8023AD
) {
4309 pr_info("lacp_rate param is irrelevant in mode %s\n",
4310 bond_mode_name(bond_mode
));
4312 bond_opt_initstr(&newval
, lacp_rate
);
4313 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE
),
4316 pr_err("Error: Invalid lacp rate \"%s\"\n",
4320 lacp_fast
= valptr
->value
;
4325 bond_opt_initstr(&newval
, ad_select
);
4326 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT
),
4329 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select
);
4332 params
->ad_select
= valptr
->value
;
4333 if (bond_mode
!= BOND_MODE_8023AD
)
4334 pr_warn("ad_select param only affects 802.3ad mode\n");
4336 params
->ad_select
= BOND_AD_STABLE
;
4339 if (max_bonds
< 0) {
4340 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4341 max_bonds
, 0, INT_MAX
, BOND_DEFAULT_MAX_BONDS
);
4342 max_bonds
= BOND_DEFAULT_MAX_BONDS
;
4346 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4352 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4357 if (downdelay
< 0) {
4358 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4359 downdelay
, INT_MAX
);
4363 if ((use_carrier
!= 0) && (use_carrier
!= 1)) {
4364 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4369 if (num_peer_notif
< 0 || num_peer_notif
> 255) {
4370 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4375 /* reset values for 802.3ad/TLB/ALB */
4376 if (!bond_mode_uses_arp(bond_mode
)) {
4378 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");
4379 pr_warn("Forcing miimon to 100msec\n");
4380 miimon
= BOND_DEFAULT_MIIMON
;
4384 if (tx_queues
< 1 || tx_queues
> 255) {
4385 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4386 tx_queues
, BOND_DEFAULT_TX_QUEUES
);
4387 tx_queues
= BOND_DEFAULT_TX_QUEUES
;
4390 if ((all_slaves_active
!= 0) && (all_slaves_active
!= 1)) {
4391 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4393 all_slaves_active
= 0;
4396 if (resend_igmp
< 0 || resend_igmp
> 255) {
4397 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4398 resend_igmp
, BOND_DEFAULT_RESEND_IGMP
);
4399 resend_igmp
= BOND_DEFAULT_RESEND_IGMP
;
4402 bond_opt_initval(&newval
, packets_per_slave
);
4403 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE
), &newval
)) {
4404 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4405 packets_per_slave
, USHRT_MAX
);
4406 packets_per_slave
= 1;
4409 if (bond_mode
== BOND_MODE_ALB
) {
4410 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",
4415 if (updelay
|| downdelay
) {
4416 /* just warn the user the up/down delay will have
4417 * no effect since miimon is zero...
4419 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",
4420 updelay
, downdelay
);
4423 /* don't allow arp monitoring */
4425 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4426 miimon
, arp_interval
);
4430 if ((updelay
% miimon
) != 0) {
4431 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4432 updelay
, miimon
, (updelay
/ miimon
) * miimon
);
4437 if ((downdelay
% miimon
) != 0) {
4438 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4440 (downdelay
/ miimon
) * miimon
);
4443 downdelay
/= miimon
;
4446 if (arp_interval
< 0) {
4447 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4448 arp_interval
, INT_MAX
);
4452 for (arp_ip_count
= 0, i
= 0;
4453 (arp_ip_count
< BOND_MAX_ARP_TARGETS
) && arp_ip_target
[i
]; i
++) {
4456 /* not a complete check, but good enough to catch mistakes */
4457 if (!in4_pton(arp_ip_target
[i
], -1, (u8
*)&ip
, -1, NULL
) ||
4458 !bond_is_ip_target_ok(ip
)) {
4459 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4463 if (bond_get_targets_ip(arp_target
, ip
) == -1)
4464 arp_target
[arp_ip_count
++] = ip
;
4466 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4471 if (arp_interval
&& !arp_ip_count
) {
4472 /* don't allow arping if no arp_ip_target given... */
4473 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4479 if (!arp_interval
) {
4480 pr_err("arp_validate requires arp_interval\n");
4484 bond_opt_initstr(&newval
, arp_validate
);
4485 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE
),
4488 pr_err("Error: invalid arp_validate \"%s\"\n",
4492 arp_validate_value
= valptr
->value
;
4494 arp_validate_value
= 0;
4497 arp_all_targets_value
= 0;
4498 if (arp_all_targets
) {
4499 bond_opt_initstr(&newval
, arp_all_targets
);
4500 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS
),
4503 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4505 arp_all_targets_value
= 0;
4507 arp_all_targets_value
= valptr
->value
;
4512 pr_info("MII link monitoring set to %d ms\n", miimon
);
4513 } else if (arp_interval
) {
4514 valptr
= bond_opt_get_val(BOND_OPT_ARP_VALIDATE
,
4515 arp_validate_value
);
4516 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4517 arp_interval
, valptr
->string
, arp_ip_count
);
4519 for (i
= 0; i
< arp_ip_count
; i
++)
4520 pr_cont(" %s", arp_ip_target
[i
]);
4524 } else if (max_bonds
) {
4525 /* miimon and arp_interval not set, we need one so things
4526 * work as expected, see bonding.txt for details
4528 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");
4531 if (primary
&& !bond_mode_uses_primary(bond_mode
)) {
4532 /* currently, using a primary only makes sense
4533 * in active backup, TLB or ALB modes
4535 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4536 primary
, bond_mode_name(bond_mode
));
4540 if (primary
&& primary_reselect
) {
4541 bond_opt_initstr(&newval
, primary_reselect
);
4542 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT
),
4545 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4549 primary_reselect_value
= valptr
->value
;
4551 primary_reselect_value
= BOND_PRI_RESELECT_ALWAYS
;
4554 if (fail_over_mac
) {
4555 bond_opt_initstr(&newval
, fail_over_mac
);
4556 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC
),
4559 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4563 fail_over_mac_value
= valptr
->value
;
4564 if (bond_mode
!= BOND_MODE_ACTIVEBACKUP
)
4565 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4567 fail_over_mac_value
= BOND_FOM_NONE
;
4570 bond_opt_initstr(&newval
, "default");
4571 valptr
= bond_opt_parse(
4572 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO
),
4575 pr_err("Error: No ad_actor_sys_prio default value");
4578 ad_actor_sys_prio
= valptr
->value
;
4580 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY
),
4583 pr_err("Error: No ad_user_port_key default value");
4586 ad_user_port_key
= valptr
->value
;
4588 if (lp_interval
== 0) {
4589 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4590 INT_MAX
, BOND_ALB_DEFAULT_LP_INTERVAL
);
4591 lp_interval
= BOND_ALB_DEFAULT_LP_INTERVAL
;
4594 /* fill params struct with the proper values */
4595 params
->mode
= bond_mode
;
4596 params
->xmit_policy
= xmit_hashtype
;
4597 params
->miimon
= miimon
;
4598 params
->num_peer_notif
= num_peer_notif
;
4599 params
->arp_interval
= arp_interval
;
4600 params
->arp_validate
= arp_validate_value
;
4601 params
->arp_all_targets
= arp_all_targets_value
;
4602 params
->updelay
= updelay
;
4603 params
->downdelay
= downdelay
;
4604 params
->use_carrier
= use_carrier
;
4605 params
->lacp_fast
= lacp_fast
;
4606 params
->primary
[0] = 0;
4607 params
->primary_reselect
= primary_reselect_value
;
4608 params
->fail_over_mac
= fail_over_mac_value
;
4609 params
->tx_queues
= tx_queues
;
4610 params
->all_slaves_active
= all_slaves_active
;
4611 params
->resend_igmp
= resend_igmp
;
4612 params
->min_links
= min_links
;
4613 params
->lp_interval
= lp_interval
;
4614 params
->packets_per_slave
= packets_per_slave
;
4615 params
->tlb_dynamic_lb
= 1; /* Default value */
4616 params
->ad_actor_sys_prio
= ad_actor_sys_prio
;
4617 eth_zero_addr(params
->ad_actor_system
);
4618 params
->ad_user_port_key
= ad_user_port_key
;
4619 if (packets_per_slave
> 0) {
4620 params
->reciprocal_packets_per_slave
=
4621 reciprocal_value(packets_per_slave
);
4623 /* reciprocal_packets_per_slave is unused if
4624 * packets_per_slave is 0 or 1, just initialize it
4626 params
->reciprocal_packets_per_slave
=
4627 (struct reciprocal_value
) { 0 };
4631 strncpy(params
->primary
, primary
, IFNAMSIZ
);
4632 params
->primary
[IFNAMSIZ
- 1] = 0;
4635 memcpy(params
->arp_targets
, arp_target
, sizeof(arp_target
));
4640 /* Called from registration process */
4641 static int bond_init(struct net_device
*bond_dev
)
4643 struct bonding
*bond
= netdev_priv(bond_dev
);
4644 struct bond_net
*bn
= net_generic(dev_net(bond_dev
), bond_net_id
);
4646 netdev_dbg(bond_dev
, "Begin bond_init\n");
4648 bond
->wq
= alloc_ordered_workqueue(bond_dev
->name
, WQ_MEM_RECLAIM
);
4652 netdev_lockdep_set_classes(bond_dev
);
4654 list_add_tail(&bond
->bond_list
, &bn
->dev_list
);
4656 bond_prepare_sysfs_group(bond
);
4658 bond_debug_register(bond
);
4660 /* Ensure valid dev_addr */
4661 if (is_zero_ether_addr(bond_dev
->dev_addr
) &&
4662 bond_dev
->addr_assign_type
== NET_ADDR_PERM
)
4663 eth_hw_addr_random(bond_dev
);
4668 unsigned int bond_get_num_tx_queues(void)
4673 /* Create a new bond based on the specified name and bonding parameters.
4674 * If name is NULL, obtain a suitable "bond%d" name for us.
4675 * Caller must NOT hold rtnl_lock; we need to release it here before we
4676 * set up our sysfs entries.
4678 int bond_create(struct net
*net
, const char *name
)
4680 struct net_device
*bond_dev
;
4681 struct bonding
*bond
;
4682 struct alb_bond_info
*bond_info
;
4687 bond_dev
= alloc_netdev_mq(sizeof(struct bonding
),
4688 name
? name
: "bond%d", NET_NAME_UNKNOWN
,
4689 bond_setup
, tx_queues
);
4691 pr_err("%s: eek! can't alloc netdev!\n", name
);
4697 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4698 * It is set to 0 by default which is wrong.
4700 bond
= netdev_priv(bond_dev
);
4701 bond_info
= &(BOND_ALB_INFO(bond
));
4702 bond_info
->rx_hashtbl_used_head
= RLB_NULL_INDEX
;
4704 dev_net_set(bond_dev
, net
);
4705 bond_dev
->rtnl_link_ops
= &bond_link_ops
;
4707 res
= register_netdevice(bond_dev
);
4709 netif_carrier_off(bond_dev
);
4713 bond_destructor(bond_dev
);
4717 static int __net_init
bond_net_init(struct net
*net
)
4719 struct bond_net
*bn
= net_generic(net
, bond_net_id
);
4722 INIT_LIST_HEAD(&bn
->dev_list
);
4724 bond_create_proc_dir(bn
);
4725 bond_create_sysfs(bn
);
4730 static void __net_exit
bond_net_exit(struct net
*net
)
4732 struct bond_net
*bn
= net_generic(net
, bond_net_id
);
4733 struct bonding
*bond
, *tmp_bond
;
4736 bond_destroy_sysfs(bn
);
4738 /* Kill off any bonds created after unregistering bond rtnl ops */
4740 list_for_each_entry_safe(bond
, tmp_bond
, &bn
->dev_list
, bond_list
)
4741 unregister_netdevice_queue(bond
->dev
, &list
);
4742 unregister_netdevice_many(&list
);
4745 bond_destroy_proc_dir(bn
);
4748 static struct pernet_operations bond_net_ops
= {
4749 .init
= bond_net_init
,
4750 .exit
= bond_net_exit
,
4752 .size
= sizeof(struct bond_net
),
4755 static int __init
bonding_init(void)
4760 pr_info("%s", bond_version
);
4762 res
= bond_check_params(&bonding_defaults
);
4766 res
= register_pernet_subsys(&bond_net_ops
);
4770 res
= bond_netlink_init();
4774 bond_create_debugfs();
4776 for (i
= 0; i
< max_bonds
; i
++) {
4777 res
= bond_create(&init_net
, NULL
);
4782 register_netdevice_notifier(&bond_netdev_notifier
);
4786 bond_destroy_debugfs();
4787 bond_netlink_fini();
4789 unregister_pernet_subsys(&bond_net_ops
);
4794 static void __exit
bonding_exit(void)
4796 unregister_netdevice_notifier(&bond_netdev_notifier
);
4798 bond_destroy_debugfs();
4800 bond_netlink_fini();
4801 unregister_pernet_subsys(&bond_net_ops
);
4803 #ifdef CONFIG_NET_POLL_CONTROLLER
4804 /* Make sure we don't have an imbalance on our netpoll blocking */
4805 WARN_ON(atomic_read(&netpoll_block_tx
));
4809 module_init(bonding_init
);
4810 module_exit(bonding_exit
);
4811 MODULE_LICENSE("GPL");
4812 MODULE_VERSION(DRV_VERSION
);
4813 MODULE_DESCRIPTION(DRV_DESCRIPTION
", v" DRV_VERSION
);
4814 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");