2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/skbuff.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/pkt_sched.h>
29 #include <linux/spinlock.h>
30 #include <linux/slab.h>
31 #include <linux/timer.h>
33 #include <linux/ipv6.h>
34 #include <linux/if_arp.h>
35 #include <linux/if_ether.h>
36 #include <linux/if_bonding.h>
37 #include <linux/if_vlan.h>
42 #include <asm/byteorder.h>
48 #ifndef __long_aligned
49 #define __long_aligned __attribute__((aligned((sizeof(long)))))
51 static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
52 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
54 static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
55 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
57 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
64 u8 padding[ETH_ZLEN - ETH_HLEN];
69 __be16 prot_addr_space;
73 u8 mac_src[ETH_ALEN]; /* sender hardware address */
74 __be32 ip_src; /* sender IP address */
75 u8 mac_dst[ETH_ALEN]; /* target hardware address */
76 __be32 ip_dst; /* target IP address */
80 static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
82 return (struct arp_pkt *)skb_network_header(skb);
85 /* Forward declaration */
86 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
87 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
88 static void rlb_src_unlink(struct bonding *bond, u32 index);
89 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
92 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
97 for (i = 0; i < hash_size; i++) {
98 hash ^= hash_start[i];
104 /*********************** tlb specific functions ***************************/
106 static inline void _lock_tx_hashtbl_bh(struct bonding *bond)
108 spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
111 static inline void _unlock_tx_hashtbl_bh(struct bonding *bond)
113 spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
116 static inline void _lock_tx_hashtbl(struct bonding *bond)
118 spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
121 static inline void _unlock_tx_hashtbl(struct bonding *bond)
123 spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
126 /* Caller must hold tx_hashtbl lock */
127 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
130 entry->load_history = 1 + entry->tx_bytes /
131 BOND_TLB_REBALANCE_INTERVAL;
135 entry->tx_slave = NULL;
136 entry->next = TLB_NULL_INDEX;
137 entry->prev = TLB_NULL_INDEX;
140 static inline void tlb_init_slave(struct slave *slave)
142 SLAVE_TLB_INFO(slave).load = 0;
143 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
146 /* Caller must hold bond lock for read, BH disabled */
147 static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
150 struct tlb_client_info *tx_hash_table;
153 /* clear slave from tx_hashtbl */
154 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
156 /* skip this if we've already freed the tx hash table */
158 index = SLAVE_TLB_INFO(slave).head;
159 while (index != TLB_NULL_INDEX) {
160 u32 next_index = tx_hash_table[index].next;
161 tlb_init_table_entry(&tx_hash_table[index], save_load);
166 tlb_init_slave(slave);
169 /* Caller must hold bond lock for read */
170 static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
173 _lock_tx_hashtbl_bh(bond);
174 __tlb_clear_slave(bond, slave, save_load);
175 _unlock_tx_hashtbl_bh(bond);
178 /* Must be called before starting the monitor timer */
179 static int tlb_initialize(struct bonding *bond)
181 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
182 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
183 struct tlb_client_info *new_hashtbl;
186 new_hashtbl = kzalloc(size, GFP_KERNEL);
190 _lock_tx_hashtbl_bh(bond);
192 bond_info->tx_hashtbl = new_hashtbl;
194 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
195 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
198 _unlock_tx_hashtbl_bh(bond);
203 /* Must be called only after all slaves have been released */
204 static void tlb_deinitialize(struct bonding *bond)
206 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
208 _lock_tx_hashtbl_bh(bond);
210 kfree(bond_info->tx_hashtbl);
211 bond_info->tx_hashtbl = NULL;
213 _unlock_tx_hashtbl_bh(bond);
216 static long long compute_gap(struct slave *slave)
218 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
219 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
222 /* Caller must hold bond lock for read */
223 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
225 struct slave *slave, *least_loaded;
226 struct list_head *iter;
232 /* Find the slave with the largest gap */
233 bond_for_each_slave(bond, slave, iter) {
234 if (SLAVE_IS_OK(slave)) {
235 long long gap = compute_gap(slave);
238 least_loaded = slave;
247 static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
250 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
251 struct tlb_client_info *hash_table;
252 struct slave *assigned_slave;
254 hash_table = bond_info->tx_hashtbl;
255 assigned_slave = hash_table[hash_index].tx_slave;
256 if (!assigned_slave) {
257 assigned_slave = tlb_get_least_loaded_slave(bond);
259 if (assigned_slave) {
260 struct tlb_slave_info *slave_info =
261 &(SLAVE_TLB_INFO(assigned_slave));
262 u32 next_index = slave_info->head;
264 hash_table[hash_index].tx_slave = assigned_slave;
265 hash_table[hash_index].next = next_index;
266 hash_table[hash_index].prev = TLB_NULL_INDEX;
268 if (next_index != TLB_NULL_INDEX) {
269 hash_table[next_index].prev = hash_index;
272 slave_info->head = hash_index;
274 hash_table[hash_index].load_history;
278 if (assigned_slave) {
279 hash_table[hash_index].tx_bytes += skb_len;
282 return assigned_slave;
285 /* Caller must hold bond lock for read */
286 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
289 struct slave *tx_slave;
291 * We don't need to disable softirq here, becase
292 * tlb_choose_channel() is only called by bond_alb_xmit()
293 * which already has softirq disabled.
295 _lock_tx_hashtbl(bond);
296 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
297 _unlock_tx_hashtbl(bond);
301 /*********************** rlb specific functions ***************************/
302 static inline void _lock_rx_hashtbl_bh(struct bonding *bond)
304 spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
307 static inline void _unlock_rx_hashtbl_bh(struct bonding *bond)
309 spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
312 static inline void _lock_rx_hashtbl(struct bonding *bond)
314 spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
317 static inline void _unlock_rx_hashtbl(struct bonding *bond)
319 spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
322 /* when an ARP REPLY is received from a client update its info
325 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
327 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
328 struct rlb_client_info *client_info;
331 _lock_rx_hashtbl_bh(bond);
333 hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
334 client_info = &(bond_info->rx_hashtbl[hash_index]);
336 if ((client_info->assigned) &&
337 (client_info->ip_src == arp->ip_dst) &&
338 (client_info->ip_dst == arp->ip_src) &&
339 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
340 /* update the clients MAC address */
341 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
342 client_info->ntt = 1;
343 bond_info->rx_ntt = 1;
346 _unlock_rx_hashtbl_bh(bond);
349 static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
352 struct arp_pkt *arp, _arp;
354 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
357 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
361 /* We received an ARP from arp->ip_src.
362 * We might have used this IP address previously (on the bonding host
363 * itself or on a system that is bridged together with the bond).
364 * However, if arp->mac_src is different than what is stored in
365 * rx_hashtbl, some other host is now using the IP and we must prevent
366 * sending out client updates with this IP address and the old MAC
368 * Clean up all hash table entries that have this address as ip_src but
369 * have a different mac_src.
371 rlb_purge_src_ip(bond, arp);
373 if (arp->op_code == htons(ARPOP_REPLY)) {
374 /* update rx hash table for this ARP */
375 rlb_update_entry_from_arp(bond, arp);
376 pr_debug("Server received an ARP Reply from client\n");
379 return RX_HANDLER_ANOTHER;
382 /* Caller must hold bond lock for read */
383 static struct slave *rlb_next_rx_slave(struct bonding *bond)
385 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
386 struct slave *before = NULL, *rx_slave = NULL, *slave;
387 struct list_head *iter;
390 bond_for_each_slave(bond, slave, iter) {
391 if (!SLAVE_IS_OK(slave))
394 if (!before || before->speed < slave->speed)
397 if (!rx_slave || rx_slave->speed < slave->speed)
400 if (slave == bond_info->rx_slave)
403 /* we didn't find anything after the current or we have something
404 * better before and up to the current slave
406 if (!rx_slave || (before && rx_slave->speed < before->speed))
410 bond_info->rx_slave = rx_slave;
415 /* teach the switch the mac of a disabled slave
416 * on the primary for fault tolerance
418 * Caller must hold bond->curr_slave_lock for write or bond lock for write
420 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
422 if (!bond->curr_active_slave) {
426 if (!bond->alb_info.primary_is_promisc) {
427 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
428 bond->alb_info.primary_is_promisc = 1;
430 bond->alb_info.primary_is_promisc = 0;
433 bond->alb_info.rlb_promisc_timeout_counter = 0;
435 alb_send_learning_packets(bond->curr_active_slave, addr);
438 /* slave being removed should not be active at this point
440 * Caller must hold bond lock for read
442 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
444 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
445 struct rlb_client_info *rx_hash_table;
446 u32 index, next_index;
448 /* clear slave from rx_hashtbl */
449 _lock_rx_hashtbl_bh(bond);
451 rx_hash_table = bond_info->rx_hashtbl;
452 index = bond_info->rx_hashtbl_used_head;
453 for (; index != RLB_NULL_INDEX; index = next_index) {
454 next_index = rx_hash_table[index].used_next;
455 if (rx_hash_table[index].slave == slave) {
456 struct slave *assigned_slave = rlb_next_rx_slave(bond);
458 if (assigned_slave) {
459 rx_hash_table[index].slave = assigned_slave;
460 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
462 bond_info->rx_hashtbl[index].ntt = 1;
463 bond_info->rx_ntt = 1;
464 /* A slave has been removed from the
465 * table because it is either disabled
466 * or being released. We must retry the
467 * update to avoid clients from not
468 * being updated & disconnecting when
471 bond_info->rlb_update_retry_counter =
474 } else { /* there is no active slave */
475 rx_hash_table[index].slave = NULL;
480 _unlock_rx_hashtbl_bh(bond);
482 write_lock_bh(&bond->curr_slave_lock);
484 if (slave != bond->curr_active_slave) {
485 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
488 write_unlock_bh(&bond->curr_slave_lock);
491 static void rlb_update_client(struct rlb_client_info *client_info)
495 if (!client_info->slave) {
499 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
502 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
504 client_info->slave->dev,
506 client_info->mac_dst,
507 client_info->slave->dev->dev_addr,
508 client_info->mac_dst);
510 pr_err("%s: Error: failed to create an ARP packet\n",
511 client_info->slave->bond->dev->name);
515 skb->dev = client_info->slave->dev;
517 if (client_info->vlan_id) {
518 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id);
520 pr_err("%s: Error: failed to insert VLAN tag\n",
521 client_info->slave->bond->dev->name);
530 /* sends ARP REPLIES that update the clients that need updating */
531 static void rlb_update_rx_clients(struct bonding *bond)
533 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
534 struct rlb_client_info *client_info;
537 _lock_rx_hashtbl_bh(bond);
539 hash_index = bond_info->rx_hashtbl_used_head;
540 for (; hash_index != RLB_NULL_INDEX;
541 hash_index = client_info->used_next) {
542 client_info = &(bond_info->rx_hashtbl[hash_index]);
543 if (client_info->ntt) {
544 rlb_update_client(client_info);
545 if (bond_info->rlb_update_retry_counter == 0) {
546 client_info->ntt = 0;
551 /* do not update the entries again until this counter is zero so that
552 * not to confuse the clients.
554 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
556 _unlock_rx_hashtbl_bh(bond);
559 /* The slave was assigned a new mac address - update the clients */
560 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
562 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
563 struct rlb_client_info *client_info;
567 _lock_rx_hashtbl_bh(bond);
569 hash_index = bond_info->rx_hashtbl_used_head;
570 for (; hash_index != RLB_NULL_INDEX;
571 hash_index = client_info->used_next) {
572 client_info = &(bond_info->rx_hashtbl[hash_index]);
574 if ((client_info->slave == slave) &&
575 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
576 client_info->ntt = 1;
581 // update the team's flag only after the whole iteration
583 bond_info->rx_ntt = 1;
585 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
588 _unlock_rx_hashtbl_bh(bond);
591 /* mark all clients using src_ip to be updated */
592 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
594 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
595 struct rlb_client_info *client_info;
598 _lock_rx_hashtbl(bond);
600 hash_index = bond_info->rx_hashtbl_used_head;
601 for (; hash_index != RLB_NULL_INDEX;
602 hash_index = client_info->used_next) {
603 client_info = &(bond_info->rx_hashtbl[hash_index]);
605 if (!client_info->slave) {
606 pr_err("%s: Error: found a client with no channel in the client's hash table\n",
610 /*update all clients using this src_ip, that are not assigned
611 * to the team's address (curr_active_slave) and have a known
612 * unicast mac address.
614 if ((client_info->ip_src == src_ip) &&
615 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
616 bond->dev->dev_addr) &&
617 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
618 client_info->ntt = 1;
619 bond_info->rx_ntt = 1;
623 _unlock_rx_hashtbl(bond);
626 /* Caller must hold both bond and ptr locks for read */
627 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
629 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
630 struct arp_pkt *arp = arp_pkt(skb);
631 struct slave *assigned_slave;
632 struct rlb_client_info *client_info;
635 _lock_rx_hashtbl(bond);
637 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
638 client_info = &(bond_info->rx_hashtbl[hash_index]);
640 if (client_info->assigned) {
641 if ((client_info->ip_src == arp->ip_src) &&
642 (client_info->ip_dst == arp->ip_dst)) {
643 /* the entry is already assigned to this client */
644 if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
645 /* update mac address from arp */
646 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
648 memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN);
650 assigned_slave = client_info->slave;
651 if (assigned_slave) {
652 _unlock_rx_hashtbl(bond);
653 return assigned_slave;
656 /* the entry is already assigned to some other client,
657 * move the old client to primary (curr_active_slave) so
658 * that the new client can be assigned to this entry.
660 if (bond->curr_active_slave &&
661 client_info->slave != bond->curr_active_slave) {
662 client_info->slave = bond->curr_active_slave;
663 rlb_update_client(client_info);
667 /* assign a new slave */
668 assigned_slave = rlb_next_rx_slave(bond);
670 if (assigned_slave) {
671 if (!(client_info->assigned &&
672 client_info->ip_src == arp->ip_src)) {
673 /* ip_src is going to be updated,
674 * fix the src hash list
676 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
677 sizeof(arp->ip_src));
678 rlb_src_unlink(bond, hash_index);
679 rlb_src_link(bond, hash_src, hash_index);
682 client_info->ip_src = arp->ip_src;
683 client_info->ip_dst = arp->ip_dst;
684 /* arp->mac_dst is broadcast for arp reqeusts.
685 * will be updated with clients actual unicast mac address
686 * upon receiving an arp reply.
688 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
689 memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN);
690 client_info->slave = assigned_slave;
692 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
693 client_info->ntt = 1;
694 bond->alb_info.rx_ntt = 1;
696 client_info->ntt = 0;
699 if (!vlan_get_tag(skb, &client_info->vlan_id))
700 client_info->vlan_id = 0;
702 if (!client_info->assigned) {
703 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
704 bond_info->rx_hashtbl_used_head = hash_index;
705 client_info->used_next = prev_tbl_head;
706 if (prev_tbl_head != RLB_NULL_INDEX) {
707 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
710 client_info->assigned = 1;
714 _unlock_rx_hashtbl(bond);
716 return assigned_slave;
719 /* chooses (and returns) transmit channel for arp reply
720 * does not choose channel for other arp types since they are
721 * sent on the curr_active_slave
723 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
725 struct arp_pkt *arp = arp_pkt(skb);
726 struct slave *tx_slave = NULL;
728 /* Don't modify or load balance ARPs that do not originate locally
729 * (e.g.,arrive via a bridge).
731 if (!bond_slave_has_mac(bond, arp->mac_src))
734 if (arp->op_code == htons(ARPOP_REPLY)) {
735 /* the arp must be sent on the selected
738 tx_slave = rlb_choose_channel(skb, bond);
740 memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
742 pr_debug("Server sent ARP Reply packet\n");
743 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
744 /* Create an entry in the rx_hashtbl for this client as a
746 * When the arp reply is received the entry will be updated
747 * with the correct unicast address of the client.
749 rlb_choose_channel(skb, bond);
751 /* The ARP reply packets must be delayed so that
752 * they can cancel out the influence of the ARP request.
754 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
756 /* arp requests are broadcast and are sent on the primary
757 * the arp request will collapse all clients on the subnet to
758 * the primary slave. We must register these clients to be
759 * updated with their assigned mac.
761 rlb_req_update_subnet_clients(bond, arp->ip_src);
762 pr_debug("Server sent ARP Request packet\n");
768 /* Caller must hold bond lock for read */
769 static void rlb_rebalance(struct bonding *bond)
771 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
772 struct slave *assigned_slave;
773 struct rlb_client_info *client_info;
777 _lock_rx_hashtbl_bh(bond);
780 hash_index = bond_info->rx_hashtbl_used_head;
781 for (; hash_index != RLB_NULL_INDEX;
782 hash_index = client_info->used_next) {
783 client_info = &(bond_info->rx_hashtbl[hash_index]);
784 assigned_slave = rlb_next_rx_slave(bond);
785 if (assigned_slave && (client_info->slave != assigned_slave)) {
786 client_info->slave = assigned_slave;
787 client_info->ntt = 1;
792 /* update the team's flag only after the whole iteration */
794 bond_info->rx_ntt = 1;
796 _unlock_rx_hashtbl_bh(bond);
799 /* Caller must hold rx_hashtbl lock */
800 static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
802 entry->used_next = RLB_NULL_INDEX;
803 entry->used_prev = RLB_NULL_INDEX;
808 static void rlb_init_table_entry_src(struct rlb_client_info *entry)
810 entry->src_first = RLB_NULL_INDEX;
811 entry->src_prev = RLB_NULL_INDEX;
812 entry->src_next = RLB_NULL_INDEX;
815 static void rlb_init_table_entry(struct rlb_client_info *entry)
817 memset(entry, 0, sizeof(struct rlb_client_info));
818 rlb_init_table_entry_dst(entry);
819 rlb_init_table_entry_src(entry);
822 static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
824 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
825 u32 next_index = bond_info->rx_hashtbl[index].used_next;
826 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
828 if (index == bond_info->rx_hashtbl_used_head)
829 bond_info->rx_hashtbl_used_head = next_index;
830 if (prev_index != RLB_NULL_INDEX)
831 bond_info->rx_hashtbl[prev_index].used_next = next_index;
832 if (next_index != RLB_NULL_INDEX)
833 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
836 /* unlink a rlb hash table entry from the src list */
837 static void rlb_src_unlink(struct bonding *bond, u32 index)
839 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
840 u32 next_index = bond_info->rx_hashtbl[index].src_next;
841 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
843 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
844 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
846 if (next_index != RLB_NULL_INDEX)
847 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
849 if (prev_index == RLB_NULL_INDEX)
852 /* is prev_index pointing to the head of this list? */
853 if (bond_info->rx_hashtbl[prev_index].src_first == index)
854 bond_info->rx_hashtbl[prev_index].src_first = next_index;
856 bond_info->rx_hashtbl[prev_index].src_next = next_index;
860 static void rlb_delete_table_entry(struct bonding *bond, u32 index)
862 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
863 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
865 rlb_delete_table_entry_dst(bond, index);
866 rlb_init_table_entry_dst(entry);
868 rlb_src_unlink(bond, index);
871 /* add the rx_hashtbl[ip_dst_hash] entry to the list
872 * of entries with identical ip_src_hash
874 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
876 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
879 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
880 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
881 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
882 if (next != RLB_NULL_INDEX)
883 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
884 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
887 /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
888 * not match arp->mac_src */
889 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
891 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
892 u32 ip_src_hash = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
895 _lock_rx_hashtbl_bh(bond);
897 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
898 while (index != RLB_NULL_INDEX) {
899 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
900 u32 next_index = entry->src_next;
901 if (entry->ip_src == arp->ip_src &&
902 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
903 rlb_delete_table_entry(bond, index);
906 _unlock_rx_hashtbl_bh(bond);
909 static int rlb_initialize(struct bonding *bond)
911 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
912 struct rlb_client_info *new_hashtbl;
913 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
916 new_hashtbl = kmalloc(size, GFP_KERNEL);
920 _lock_rx_hashtbl_bh(bond);
922 bond_info->rx_hashtbl = new_hashtbl;
924 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
926 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
927 rlb_init_table_entry(bond_info->rx_hashtbl + i);
930 _unlock_rx_hashtbl_bh(bond);
932 /* register to receive ARPs */
933 bond->recv_probe = rlb_arp_recv;
938 static void rlb_deinitialize(struct bonding *bond)
940 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
942 _lock_rx_hashtbl_bh(bond);
944 kfree(bond_info->rx_hashtbl);
945 bond_info->rx_hashtbl = NULL;
946 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
948 _unlock_rx_hashtbl_bh(bond);
951 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
953 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
956 _lock_rx_hashtbl_bh(bond);
958 curr_index = bond_info->rx_hashtbl_used_head;
959 while (curr_index != RLB_NULL_INDEX) {
960 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
961 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
963 if (curr->vlan_id == vlan_id)
964 rlb_delete_table_entry(bond, curr_index);
966 curr_index = next_index;
969 _unlock_rx_hashtbl_bh(bond);
972 /*********************** tlb/rlb shared functions *********************/
974 static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
977 struct learning_pkt pkt;
979 int size = sizeof(struct learning_pkt);
982 memset(&pkt, 0, size);
983 memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
984 memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
985 pkt.type = cpu_to_be16(ETH_P_LOOP);
987 skb = dev_alloc_skb(size);
991 data = skb_put(skb, size);
992 memcpy(data, &pkt, size);
994 skb_reset_mac_header(skb);
995 skb->network_header = skb->mac_header + ETH_HLEN;
996 skb->protocol = pkt.type;
997 skb->priority = TC_PRIO_CONTROL;
998 skb->dev = slave->dev;
1001 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vid);
1003 pr_err("%s: Error: failed to insert VLAN tag\n",
1004 slave->bond->dev->name);
1009 dev_queue_xmit(skb);
1013 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
1015 struct bonding *bond = bond_get_bond_by_slave(slave);
1016 struct net_device *upper;
1017 struct list_head *iter;
1020 alb_send_lp_vid(slave, mac_addr, 0);
1022 /* loop through vlans and send one packet for each */
1024 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
1025 if (upper->priv_flags & IFF_802_1Q_VLAN)
1026 alb_send_lp_vid(slave, mac_addr,
1027 vlan_dev_vlan_id(upper));
1032 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
1034 struct net_device *dev = slave->dev;
1035 struct sockaddr s_addr;
1037 if (slave->bond->params.mode == BOND_MODE_TLB) {
1038 memcpy(dev->dev_addr, addr, dev->addr_len);
1042 /* for rlb each slave must have a unique hw mac addresses so that */
1043 /* each slave will receive packets destined to a different mac */
1044 memcpy(s_addr.sa_data, addr, dev->addr_len);
1045 s_addr.sa_family = dev->type;
1046 if (dev_set_mac_address(dev, &s_addr)) {
1047 pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
1048 "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
1049 slave->bond->dev->name, dev->name);
1056 * Swap MAC addresses between two slaves.
1058 * Called with RTNL held, and no other locks.
1062 static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1064 u8 tmp_mac_addr[ETH_ALEN];
1066 memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
1067 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
1068 alb_set_slave_mac_addr(slave2, tmp_mac_addr);
1073 * Send learning packets after MAC address swap.
1075 * Called with RTNL and no other locks
1077 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1078 struct slave *slave2)
1080 int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
1081 struct slave *disabled_slave = NULL;
1085 /* fasten the change in the switch */
1086 if (SLAVE_IS_OK(slave1)) {
1087 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
1088 if (bond->alb_info.rlb_enabled) {
1089 /* inform the clients that the mac address
1092 rlb_req_update_slave_clients(bond, slave1);
1095 disabled_slave = slave1;
1098 if (SLAVE_IS_OK(slave2)) {
1099 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
1100 if (bond->alb_info.rlb_enabled) {
1101 /* inform the clients that the mac address
1104 rlb_req_update_slave_clients(bond, slave2);
1107 disabled_slave = slave2;
1110 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1111 /* A disabled slave was assigned an active mac addr */
1112 rlb_teach_disabled_mac_on_primary(bond,
1113 disabled_slave->dev->dev_addr);
1118 * alb_change_hw_addr_on_detach
1119 * @bond: bonding we're working on
1120 * @slave: the slave that was just detached
1122 * We assume that @slave was already detached from the slave list.
1124 * If @slave's permanent hw address is different both from its current
1125 * address and from @bond's address, then somewhere in the bond there's
1126 * a slave that has @slave's permanet address as its current address.
1127 * We'll make sure that that slave no longer uses @slave's permanent address.
1129 * Caller must hold RTNL and no other locks
1131 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1135 struct slave *found_slave;
1137 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1138 slave->dev->dev_addr);
1139 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1140 bond->dev->dev_addr);
1142 if (perm_curr_diff && perm_bond_diff) {
1143 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1146 /* locking: needs RTNL and nothing else */
1147 alb_swap_mac_addr(slave, found_slave);
1148 alb_fasten_mac_swap(bond, slave, found_slave);
1154 * alb_handle_addr_collision_on_attach
1155 * @bond: bonding we're working on
1156 * @slave: the slave that was just attached
1158 * checks uniqueness of slave's mac address and handles the case the
1159 * new slave uses the bonds mac address.
1161 * If the permanent hw address of @slave is @bond's hw address, we need to
1162 * find a different hw address to give @slave, that isn't in use by any other
1163 * slave in the bond. This address must be, of course, one of the permanent
1164 * addresses of the other slaves.
1166 * We go over the slave list, and for each slave there we compare its
1167 * permanent hw address with the current address of all the other slaves.
1168 * If no match was found, then we've found a slave with a permanent address
1169 * that isn't used by any other slave in the bond, so we can assign it to
1172 * assumption: this function is called before @slave is attached to the
1175 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1177 struct slave *has_bond_addr = bond->curr_active_slave;
1178 struct slave *tmp_slave1, *free_mac_slave = NULL;
1179 struct list_head *iter;
1181 if (!bond_has_slaves(bond)) {
1182 /* this is the first slave */
1186 /* if slave's mac address differs from bond's mac address
1187 * check uniqueness of slave's mac address against the other
1188 * slaves in the bond.
1190 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1191 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1194 /* Try setting slave mac to bond address and fall-through
1195 to code handling that situation below... */
1196 alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
1199 /* The slave's address is equal to the address of the bond.
1200 * Search for a spare address in the bond for this slave.
1202 bond_for_each_slave(bond, tmp_slave1, iter) {
1203 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1204 /* no slave has tmp_slave1's perm addr
1207 free_mac_slave = tmp_slave1;
1211 if (!has_bond_addr) {
1212 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1213 bond->dev->dev_addr)) {
1215 has_bond_addr = tmp_slave1;
1220 if (free_mac_slave) {
1221 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
1223 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1224 bond->dev->name, slave->dev->name,
1225 free_mac_slave->dev->name);
1227 } else if (has_bond_addr) {
1228 pr_err("%s: Error: the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n",
1229 bond->dev->name, slave->dev->name);
1237 * alb_set_mac_address
1241 * In TLB mode all slaves are configured to the bond's hw address, but set
1242 * their dev_addr field to different addresses (based on their permanent hw
1245 * For each slave, this function sets the interface to the new address and then
1246 * changes its dev_addr field to its previous value.
1248 * Unwinding assumes bond's mac address has not yet changed.
1250 static int alb_set_mac_address(struct bonding *bond, void *addr)
1252 struct slave *slave, *rollback_slave;
1253 struct list_head *iter;
1255 char tmp_addr[ETH_ALEN];
1258 if (bond->alb_info.rlb_enabled)
1261 bond_for_each_slave(bond, slave, iter) {
1262 /* save net_device's current hw address */
1263 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1265 res = dev_set_mac_address(slave->dev, addr);
1267 /* restore net_device's hw address */
1268 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1277 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1278 sa.sa_family = bond->dev->type;
1280 /* unwind from head to the slave that failed */
1281 bond_for_each_slave(bond, rollback_slave, iter) {
1282 if (rollback_slave == slave)
1284 memcpy(tmp_addr, rollback_slave->dev->dev_addr, ETH_ALEN);
1285 dev_set_mac_address(rollback_slave->dev, &sa);
1286 memcpy(rollback_slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1292 /************************ exported alb funcions ************************/
1294 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1298 res = tlb_initialize(bond);
1304 bond->alb_info.rlb_enabled = 1;
1305 /* initialize rlb */
1306 res = rlb_initialize(bond);
1308 tlb_deinitialize(bond);
1312 bond->alb_info.rlb_enabled = 0;
1318 void bond_alb_deinitialize(struct bonding *bond)
1320 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1322 tlb_deinitialize(bond);
1324 if (bond_info->rlb_enabled) {
1325 rlb_deinitialize(bond);
1329 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1331 struct bonding *bond = netdev_priv(bond_dev);
1332 struct ethhdr *eth_data;
1333 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1334 struct slave *tx_slave = NULL;
1335 static const __be32 ip_bcast = htonl(0xffffffff);
1337 int do_tx_balance = 1;
1339 const u8 *hash_start = NULL;
1341 struct ipv6hdr *ip6hdr;
1343 skb_reset_mac_header(skb);
1344 eth_data = eth_hdr(skb);
1346 /* make sure that the curr_active_slave do not change during tx
1348 read_lock(&bond->lock);
1349 read_lock(&bond->curr_slave_lock);
1351 switch (ntohs(skb->protocol)) {
1353 const struct iphdr *iph = ip_hdr(skb);
1355 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1356 (iph->daddr == ip_bcast) ||
1357 (iph->protocol == IPPROTO_IGMP)) {
1361 hash_start = (char *)&(iph->daddr);
1362 hash_size = sizeof(iph->daddr);
1366 /* IPv6 doesn't really use broadcast mac address, but leave
1367 * that here just in case.
1369 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1374 /* IPv6 uses all-nodes multicast as an equivalent to
1375 * broadcasts in IPv4.
1377 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1382 /* Additianally, DAD probes should not be tx-balanced as that
1383 * will lead to false positives for duplicate addresses and
1384 * prevent address configuration from working.
1386 ip6hdr = ipv6_hdr(skb);
1387 if (ipv6_addr_any(&ip6hdr->saddr)) {
1392 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1393 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1396 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1397 /* something is wrong with this packet */
1402 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1403 /* The only protocol worth balancing in
1404 * this family since it has an "ARP" like
1411 hash_start = (char*)eth_data->h_dest;
1412 hash_size = ETH_ALEN;
1416 if (bond_info->rlb_enabled) {
1417 tx_slave = rlb_arp_xmit(skb, bond);
1425 if (do_tx_balance) {
1426 hash_index = _simple_hash(hash_start, hash_size);
1427 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1431 /* unbalanced or unassigned, send through primary */
1432 tx_slave = bond->curr_active_slave;
1433 bond_info->unbalanced_load += skb->len;
1436 if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1437 if (tx_slave != bond->curr_active_slave) {
1438 memcpy(eth_data->h_source,
1439 tx_slave->dev->dev_addr,
1443 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1446 _lock_tx_hashtbl(bond);
1447 __tlb_clear_slave(bond, tx_slave, 0);
1448 _unlock_tx_hashtbl(bond);
1452 read_unlock(&bond->curr_slave_lock);
1453 read_unlock(&bond->lock);
1455 /* no suitable interface, frame not sent */
1459 return NETDEV_TX_OK;
1462 void bond_alb_monitor(struct work_struct *work)
1464 struct bonding *bond = container_of(work, struct bonding,
1466 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1467 struct list_head *iter;
1468 struct slave *slave;
1470 read_lock(&bond->lock);
1472 if (!bond_has_slaves(bond)) {
1473 bond_info->tx_rebalance_counter = 0;
1474 bond_info->lp_counter = 0;
1478 bond_info->tx_rebalance_counter++;
1479 bond_info->lp_counter++;
1481 /* send learning packets */
1482 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1483 /* change of curr_active_slave involves swapping of mac addresses.
1484 * in order to avoid this swapping from happening while
1485 * sending the learning packets, the curr_slave_lock must be held for
1488 read_lock(&bond->curr_slave_lock);
1490 bond_for_each_slave(bond, slave, iter)
1491 alb_send_learning_packets(slave, slave->dev->dev_addr);
1493 read_unlock(&bond->curr_slave_lock);
1495 bond_info->lp_counter = 0;
1498 /* rebalance tx traffic */
1499 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1501 read_lock(&bond->curr_slave_lock);
1503 bond_for_each_slave(bond, slave, iter) {
1504 tlb_clear_slave(bond, slave, 1);
1505 if (slave == bond->curr_active_slave) {
1506 SLAVE_TLB_INFO(slave).load =
1507 bond_info->unbalanced_load /
1508 BOND_TLB_REBALANCE_INTERVAL;
1509 bond_info->unbalanced_load = 0;
1513 read_unlock(&bond->curr_slave_lock);
1515 bond_info->tx_rebalance_counter = 0;
1518 /* handle rlb stuff */
1519 if (bond_info->rlb_enabled) {
1520 if (bond_info->primary_is_promisc &&
1521 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1524 * dev_set_promiscuity requires rtnl and
1525 * nothing else. Avoid race with bond_close.
1527 read_unlock(&bond->lock);
1528 if (!rtnl_trylock()) {
1529 read_lock(&bond->lock);
1533 bond_info->rlb_promisc_timeout_counter = 0;
1535 /* If the primary was set to promiscuous mode
1536 * because a slave was disabled then
1537 * it can now leave promiscuous mode.
1539 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1540 bond_info->primary_is_promisc = 0;
1543 read_lock(&bond->lock);
1546 if (bond_info->rlb_rebalance) {
1547 bond_info->rlb_rebalance = 0;
1548 rlb_rebalance(bond);
1551 /* check if clients need updating */
1552 if (bond_info->rx_ntt) {
1553 if (bond_info->rlb_update_delay_counter) {
1554 --bond_info->rlb_update_delay_counter;
1556 rlb_update_rx_clients(bond);
1557 if (bond_info->rlb_update_retry_counter) {
1558 --bond_info->rlb_update_retry_counter;
1560 bond_info->rx_ntt = 0;
1567 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1569 read_unlock(&bond->lock);
1572 /* assumption: called before the slave is attached to the bond
1573 * and not locked by the bond lock
1575 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1579 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
1584 res = alb_handle_addr_collision_on_attach(bond, slave);
1589 tlb_init_slave(slave);
1591 /* order a rebalance ASAP */
1592 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1594 if (bond->alb_info.rlb_enabled) {
1595 bond->alb_info.rlb_rebalance = 1;
1602 * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1605 * Caller must hold RTNL and no other locks
1607 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1609 if (bond_has_slaves(bond))
1610 alb_change_hw_addr_on_detach(bond, slave);
1612 tlb_clear_slave(bond, slave, 0);
1614 if (bond->alb_info.rlb_enabled) {
1615 bond->alb_info.rx_slave = NULL;
1616 rlb_clear_slave(bond, slave);
1620 /* Caller must hold bond lock for read */
1621 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1623 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1625 if (link == BOND_LINK_DOWN) {
1626 tlb_clear_slave(bond, slave, 0);
1627 if (bond->alb_info.rlb_enabled) {
1628 rlb_clear_slave(bond, slave);
1630 } else if (link == BOND_LINK_UP) {
1631 /* order a rebalance ASAP */
1632 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1633 if (bond->alb_info.rlb_enabled) {
1634 bond->alb_info.rlb_rebalance = 1;
1635 /* If the updelay module parameter is smaller than the
1636 * forwarding delay of the switch the rebalance will
1637 * not work because the rebalance arp replies will
1638 * not be forwarded to the clients..
1645 * bond_alb_handle_active_change - assign new curr_active_slave
1646 * @bond: our bonding struct
1647 * @new_slave: new slave to assign
1649 * Set the bond->curr_active_slave to @new_slave and handle
1650 * mac address swapping and promiscuity changes as needed.
1652 * If new_slave is NULL, caller must hold curr_slave_lock or
1653 * bond->lock for write.
1655 * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1656 * read and curr_slave_lock for write. Processing here may sleep, so
1657 * no other locks may be held.
1659 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1660 __releases(&bond->curr_slave_lock)
1661 __releases(&bond->lock)
1662 __acquires(&bond->lock)
1663 __acquires(&bond->curr_slave_lock)
1665 struct slave *swap_slave;
1667 if (bond->curr_active_slave == new_slave)
1670 if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1671 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1672 bond->alb_info.primary_is_promisc = 0;
1673 bond->alb_info.rlb_promisc_timeout_counter = 0;
1676 swap_slave = bond->curr_active_slave;
1677 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1679 if (!new_slave || !bond_has_slaves(bond))
1682 /* set the new curr_active_slave to the bonds mac address
1683 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1686 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1689 * Arrange for swap_slave and new_slave to temporarily be
1690 * ignored so we can mess with their MAC addresses without
1691 * fear of interference from transmit activity.
1694 tlb_clear_slave(bond, swap_slave, 1);
1695 tlb_clear_slave(bond, new_slave, 1);
1697 write_unlock_bh(&bond->curr_slave_lock);
1698 read_unlock(&bond->lock);
1702 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1704 /* swap mac address */
1705 alb_swap_mac_addr(swap_slave, new_slave);
1706 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1707 read_lock(&bond->lock);
1709 /* set the new_slave to the bond mac address */
1710 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
1711 read_lock(&bond->lock);
1712 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1715 write_lock_bh(&bond->curr_slave_lock);
1721 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1722 __acquires(&bond->lock)
1723 __releases(&bond->lock)
1725 struct bonding *bond = netdev_priv(bond_dev);
1726 struct sockaddr *sa = addr;
1727 struct slave *swap_slave;
1730 if (!is_valid_ether_addr(sa->sa_data)) {
1731 return -EADDRNOTAVAIL;
1734 res = alb_set_mac_address(bond, addr);
1739 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1741 /* If there is no curr_active_slave there is nothing else to do.
1742 * Otherwise we'll need to pass the new address to it and handle
1745 if (!bond->curr_active_slave) {
1749 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1752 alb_swap_mac_addr(swap_slave, bond->curr_active_slave);
1753 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1755 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr);
1757 read_lock(&bond->lock);
1758 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1759 if (bond->alb_info.rlb_enabled) {
1760 /* inform clients mac address has changed */
1761 rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1763 read_unlock(&bond->lock);
1769 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1771 if (bond->alb_info.rlb_enabled) {
1772 rlb_clear_vlan(bond, vlan_id);