1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
6 #include <linux/skbuff.h>
7 #include <linux/netdevice.h>
8 #include <linux/etherdevice.h>
9 #include <linux/pkt_sched.h>
10 #include <linux/spinlock.h>
11 #include <linux/slab.h>
12 #include <linux/timer.h>
14 #include <linux/ipv6.h>
15 #include <linux/if_arp.h>
16 #include <linux/if_ether.h>
17 #include <linux/if_bonding.h>
18 #include <linux/if_vlan.h>
22 #include <net/ndisc.h>
23 #include <asm/byteorder.h>
24 #include <net/bonding.h>
25 #include <net/bond_alb.h>
27 static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
28 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
30 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
37 u8 padding[ETH_ZLEN - ETH_HLEN];
42 __be16 prot_addr_space;
46 u8 mac_src[ETH_ALEN]; /* sender hardware address */
47 __be32 ip_src; /* sender IP address */
48 u8 mac_dst[ETH_ALEN]; /* target hardware address */
49 __be32 ip_dst; /* target IP address */
53 /* Forward declaration */
54 static void alb_send_learning_packets(struct slave *slave, const u8 mac_addr[],
56 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
57 static void rlb_src_unlink(struct bonding *bond, u32 index);
58 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
61 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
66 for (i = 0; i < hash_size; i++)
67 hash ^= hash_start[i];
72 /*********************** tlb specific functions ***************************/
74 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
77 entry->load_history = 1 + entry->tx_bytes /
78 BOND_TLB_REBALANCE_INTERVAL;
82 entry->tx_slave = NULL;
83 entry->next = TLB_NULL_INDEX;
84 entry->prev = TLB_NULL_INDEX;
87 static inline void tlb_init_slave(struct slave *slave)
89 SLAVE_TLB_INFO(slave).load = 0;
90 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
93 static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
96 struct tlb_client_info *tx_hash_table;
99 /* clear slave from tx_hashtbl */
100 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
102 /* skip this if we've already freed the tx hash table */
104 index = SLAVE_TLB_INFO(slave).head;
105 while (index != TLB_NULL_INDEX) {
106 u32 next_index = tx_hash_table[index].next;
108 tlb_init_table_entry(&tx_hash_table[index], save_load);
113 tlb_init_slave(slave);
116 static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
119 spin_lock_bh(&bond->mode_lock);
120 __tlb_clear_slave(bond, slave, save_load);
121 spin_unlock_bh(&bond->mode_lock);
124 /* Must be called before starting the monitor timer */
125 static int tlb_initialize(struct bonding *bond)
127 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
128 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
129 struct tlb_client_info *new_hashtbl;
132 new_hashtbl = kzalloc(size, GFP_KERNEL);
136 spin_lock_bh(&bond->mode_lock);
138 bond_info->tx_hashtbl = new_hashtbl;
140 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
141 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
143 spin_unlock_bh(&bond->mode_lock);
148 /* Must be called only after all slaves have been released */
149 static void tlb_deinitialize(struct bonding *bond)
151 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
153 spin_lock_bh(&bond->mode_lock);
155 kfree(bond_info->tx_hashtbl);
156 bond_info->tx_hashtbl = NULL;
158 spin_unlock_bh(&bond->mode_lock);
161 static long long compute_gap(struct slave *slave)
163 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
164 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
167 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
169 struct slave *slave, *least_loaded;
170 struct list_head *iter;
176 /* Find the slave with the largest gap */
177 bond_for_each_slave_rcu(bond, slave, iter) {
178 if (bond_slave_can_tx(slave)) {
179 long long gap = compute_gap(slave);
182 least_loaded = slave;
191 static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
194 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
195 struct tlb_client_info *hash_table;
196 struct slave *assigned_slave;
198 hash_table = bond_info->tx_hashtbl;
199 assigned_slave = hash_table[hash_index].tx_slave;
200 if (!assigned_slave) {
201 assigned_slave = tlb_get_least_loaded_slave(bond);
203 if (assigned_slave) {
204 struct tlb_slave_info *slave_info =
205 &(SLAVE_TLB_INFO(assigned_slave));
206 u32 next_index = slave_info->head;
208 hash_table[hash_index].tx_slave = assigned_slave;
209 hash_table[hash_index].next = next_index;
210 hash_table[hash_index].prev = TLB_NULL_INDEX;
212 if (next_index != TLB_NULL_INDEX)
213 hash_table[next_index].prev = hash_index;
215 slave_info->head = hash_index;
217 hash_table[hash_index].load_history;
222 hash_table[hash_index].tx_bytes += skb_len;
224 return assigned_slave;
227 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
230 struct slave *tx_slave;
232 /* We don't need to disable softirq here, because
233 * tlb_choose_channel() is only called by bond_alb_xmit()
234 * which already has softirq disabled.
236 spin_lock(&bond->mode_lock);
237 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
238 spin_unlock(&bond->mode_lock);
243 /*********************** rlb specific functions ***************************/
245 /* when an ARP REPLY is received from a client update its info
248 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
250 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
251 struct rlb_client_info *client_info;
254 spin_lock_bh(&bond->mode_lock);
256 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
257 client_info = &(bond_info->rx_hashtbl[hash_index]);
259 if ((client_info->assigned) &&
260 (client_info->ip_src == arp->ip_dst) &&
261 (client_info->ip_dst == arp->ip_src) &&
262 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
263 /* update the clients MAC address */
264 ether_addr_copy(client_info->mac_dst, arp->mac_src);
265 client_info->ntt = 1;
266 bond_info->rx_ntt = 1;
269 spin_unlock_bh(&bond->mode_lock);
272 static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
275 struct arp_pkt *arp, _arp;
277 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
280 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
284 /* We received an ARP from arp->ip_src.
285 * We might have used this IP address previously (on the bonding host
286 * itself or on a system that is bridged together with the bond).
287 * However, if arp->mac_src is different than what is stored in
288 * rx_hashtbl, some other host is now using the IP and we must prevent
289 * sending out client updates with this IP address and the old MAC
291 * Clean up all hash table entries that have this address as ip_src but
292 * have a different mac_src.
294 rlb_purge_src_ip(bond, arp);
296 if (arp->op_code == htons(ARPOP_REPLY)) {
297 /* update rx hash table for this ARP */
298 rlb_update_entry_from_arp(bond, arp);
299 slave_dbg(bond->dev, slave->dev, "Server received an ARP Reply from client\n");
302 return RX_HANDLER_ANOTHER;
305 /* Caller must hold rcu_read_lock() */
306 static struct slave *__rlb_next_rx_slave(struct bonding *bond)
308 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
309 struct slave *before = NULL, *rx_slave = NULL, *slave;
310 struct list_head *iter;
313 bond_for_each_slave_rcu(bond, slave, iter) {
314 if (!bond_slave_can_tx(slave))
317 if (!before || before->speed < slave->speed)
320 if (!rx_slave || rx_slave->speed < slave->speed)
323 if (slave == bond_info->rx_slave)
326 /* we didn't find anything after the current or we have something
327 * better before and up to the current slave
329 if (!rx_slave || (before && rx_slave->speed < before->speed))
333 bond_info->rx_slave = rx_slave;
338 /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
339 static struct slave *rlb_next_rx_slave(struct bonding *bond)
341 struct slave *rx_slave;
346 rx_slave = __rlb_next_rx_slave(bond);
352 /* teach the switch the mac of a disabled slave
353 * on the primary for fault tolerance
355 * Caller must hold RTNL
357 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond,
360 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
365 if (!bond->alb_info.primary_is_promisc) {
366 if (!dev_set_promiscuity(curr_active->dev, 1))
367 bond->alb_info.primary_is_promisc = 1;
369 bond->alb_info.primary_is_promisc = 0;
372 bond->alb_info.rlb_promisc_timeout_counter = 0;
374 alb_send_learning_packets(curr_active, addr, true);
377 /* slave being removed should not be active at this point
379 * Caller must hold rtnl.
381 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
383 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
384 struct rlb_client_info *rx_hash_table;
385 u32 index, next_index;
387 /* clear slave from rx_hashtbl */
388 spin_lock_bh(&bond->mode_lock);
390 rx_hash_table = bond_info->rx_hashtbl;
391 index = bond_info->rx_hashtbl_used_head;
392 for (; index != RLB_NULL_INDEX; index = next_index) {
393 next_index = rx_hash_table[index].used_next;
394 if (rx_hash_table[index].slave == slave) {
395 struct slave *assigned_slave = rlb_next_rx_slave(bond);
397 if (assigned_slave) {
398 rx_hash_table[index].slave = assigned_slave;
399 if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) {
400 bond_info->rx_hashtbl[index].ntt = 1;
401 bond_info->rx_ntt = 1;
402 /* A slave has been removed from the
403 * table because it is either disabled
404 * or being released. We must retry the
405 * update to avoid clients from not
406 * being updated & disconnecting when
409 bond_info->rlb_update_retry_counter =
412 } else { /* there is no active slave */
413 rx_hash_table[index].slave = NULL;
418 spin_unlock_bh(&bond->mode_lock);
420 if (slave != rtnl_dereference(bond->curr_active_slave))
421 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
424 static void rlb_update_client(struct rlb_client_info *client_info)
428 if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
431 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
434 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
436 client_info->slave->dev,
438 client_info->mac_dst,
439 client_info->slave->dev->dev_addr,
440 client_info->mac_dst);
442 slave_err(client_info->slave->bond->dev,
443 client_info->slave->dev,
444 "failed to create an ARP packet\n");
448 skb->dev = client_info->slave->dev;
450 if (client_info->vlan_id) {
451 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
452 client_info->vlan_id);
459 /* sends ARP REPLIES that update the clients that need updating */
460 static void rlb_update_rx_clients(struct bonding *bond)
462 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
463 struct rlb_client_info *client_info;
466 spin_lock_bh(&bond->mode_lock);
468 hash_index = bond_info->rx_hashtbl_used_head;
469 for (; hash_index != RLB_NULL_INDEX;
470 hash_index = client_info->used_next) {
471 client_info = &(bond_info->rx_hashtbl[hash_index]);
472 if (client_info->ntt) {
473 rlb_update_client(client_info);
474 if (bond_info->rlb_update_retry_counter == 0)
475 client_info->ntt = 0;
479 /* do not update the entries again until this counter is zero so that
480 * not to confuse the clients.
482 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
484 spin_unlock_bh(&bond->mode_lock);
487 /* The slave was assigned a new mac address - update the clients */
488 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
490 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
491 struct rlb_client_info *client_info;
495 spin_lock_bh(&bond->mode_lock);
497 hash_index = bond_info->rx_hashtbl_used_head;
498 for (; hash_index != RLB_NULL_INDEX;
499 hash_index = client_info->used_next) {
500 client_info = &(bond_info->rx_hashtbl[hash_index]);
502 if ((client_info->slave == slave) &&
503 is_valid_ether_addr(client_info->mac_dst)) {
504 client_info->ntt = 1;
509 /* update the team's flag only after the whole iteration */
511 bond_info->rx_ntt = 1;
512 /* fasten the change */
513 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
516 spin_unlock_bh(&bond->mode_lock);
519 /* mark all clients using src_ip to be updated */
520 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
522 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
523 struct rlb_client_info *client_info;
526 spin_lock(&bond->mode_lock);
528 hash_index = bond_info->rx_hashtbl_used_head;
529 for (; hash_index != RLB_NULL_INDEX;
530 hash_index = client_info->used_next) {
531 client_info = &(bond_info->rx_hashtbl[hash_index]);
533 if (!client_info->slave) {
534 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
537 /* update all clients using this src_ip, that are not assigned
538 * to the team's address (curr_active_slave) and have a known
539 * unicast mac address.
541 if ((client_info->ip_src == src_ip) &&
542 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
543 bond->dev->dev_addr) &&
544 is_valid_ether_addr(client_info->mac_dst)) {
545 client_info->ntt = 1;
546 bond_info->rx_ntt = 1;
550 spin_unlock(&bond->mode_lock);
553 static struct slave *rlb_choose_channel(struct sk_buff *skb,
554 struct bonding *bond,
555 const struct arp_pkt *arp)
557 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
558 struct slave *assigned_slave, *curr_active_slave;
559 struct rlb_client_info *client_info;
562 spin_lock(&bond->mode_lock);
564 curr_active_slave = rcu_dereference(bond->curr_active_slave);
566 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
567 client_info = &(bond_info->rx_hashtbl[hash_index]);
569 if (client_info->assigned) {
570 if ((client_info->ip_src == arp->ip_src) &&
571 (client_info->ip_dst == arp->ip_dst)) {
572 /* the entry is already assigned to this client */
573 if (!is_broadcast_ether_addr(arp->mac_dst)) {
574 /* update mac address from arp */
575 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
577 ether_addr_copy(client_info->mac_src, arp->mac_src);
579 assigned_slave = client_info->slave;
580 if (assigned_slave) {
581 spin_unlock(&bond->mode_lock);
582 return assigned_slave;
585 /* the entry is already assigned to some other client,
586 * move the old client to primary (curr_active_slave) so
587 * that the new client can be assigned to this entry.
589 if (curr_active_slave &&
590 client_info->slave != curr_active_slave) {
591 client_info->slave = curr_active_slave;
592 rlb_update_client(client_info);
596 /* assign a new slave */
597 assigned_slave = __rlb_next_rx_slave(bond);
599 if (assigned_slave) {
600 if (!(client_info->assigned &&
601 client_info->ip_src == arp->ip_src)) {
602 /* ip_src is going to be updated,
603 * fix the src hash list
605 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
606 sizeof(arp->ip_src));
607 rlb_src_unlink(bond, hash_index);
608 rlb_src_link(bond, hash_src, hash_index);
611 client_info->ip_src = arp->ip_src;
612 client_info->ip_dst = arp->ip_dst;
613 /* arp->mac_dst is broadcast for arp requests.
614 * will be updated with clients actual unicast mac address
615 * upon receiving an arp reply.
617 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
618 ether_addr_copy(client_info->mac_src, arp->mac_src);
619 client_info->slave = assigned_slave;
621 if (is_valid_ether_addr(client_info->mac_dst)) {
622 client_info->ntt = 1;
623 bond->alb_info.rx_ntt = 1;
625 client_info->ntt = 0;
628 if (vlan_get_tag(skb, &client_info->vlan_id))
629 client_info->vlan_id = 0;
631 if (!client_info->assigned) {
632 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
634 bond_info->rx_hashtbl_used_head = hash_index;
635 client_info->used_next = prev_tbl_head;
636 if (prev_tbl_head != RLB_NULL_INDEX) {
637 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
640 client_info->assigned = 1;
644 spin_unlock(&bond->mode_lock);
646 return assigned_slave;
649 /* chooses (and returns) transmit channel for arp reply
650 * does not choose channel for other arp types since they are
651 * sent on the curr_active_slave
653 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
655 struct slave *tx_slave = NULL;
658 if (!pskb_network_may_pull(skb, sizeof(*arp)))
660 arp = (struct arp_pkt *)skb_network_header(skb);
662 /* Don't modify or load balance ARPs that do not originate locally
663 * (e.g.,arrive via a bridge).
665 if (!bond_slave_has_mac_rx(bond, arp->mac_src))
668 if (arp->op_code == htons(ARPOP_REPLY)) {
669 /* the arp must be sent on the selected rx channel */
670 tx_slave = rlb_choose_channel(skb, bond, arp);
672 bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
673 tx_slave->dev->addr_len);
674 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n",
675 tx_slave ? tx_slave->dev->name : "NULL");
676 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
677 /* Create an entry in the rx_hashtbl for this client as a
679 * When the arp reply is received the entry will be updated
680 * with the correct unicast address of the client.
682 tx_slave = rlb_choose_channel(skb, bond, arp);
684 /* The ARP reply packets must be delayed so that
685 * they can cancel out the influence of the ARP request.
687 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
689 /* arp requests are broadcast and are sent on the primary
690 * the arp request will collapse all clients on the subnet to
691 * the primary slave. We must register these clients to be
692 * updated with their assigned mac.
694 rlb_req_update_subnet_clients(bond, arp->ip_src);
695 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n",
696 tx_slave ? tx_slave->dev->name : "NULL");
702 static void rlb_rebalance(struct bonding *bond)
704 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
705 struct slave *assigned_slave;
706 struct rlb_client_info *client_info;
710 spin_lock_bh(&bond->mode_lock);
713 hash_index = bond_info->rx_hashtbl_used_head;
714 for (; hash_index != RLB_NULL_INDEX;
715 hash_index = client_info->used_next) {
716 client_info = &(bond_info->rx_hashtbl[hash_index]);
717 assigned_slave = __rlb_next_rx_slave(bond);
718 if (assigned_slave && (client_info->slave != assigned_slave)) {
719 client_info->slave = assigned_slave;
720 if (!is_zero_ether_addr(client_info->mac_dst)) {
721 client_info->ntt = 1;
727 /* update the team's flag only after the whole iteration */
729 bond_info->rx_ntt = 1;
730 spin_unlock_bh(&bond->mode_lock);
733 /* Caller must hold mode_lock */
734 static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
736 entry->used_next = RLB_NULL_INDEX;
737 entry->used_prev = RLB_NULL_INDEX;
742 static void rlb_init_table_entry_src(struct rlb_client_info *entry)
744 entry->src_first = RLB_NULL_INDEX;
745 entry->src_prev = RLB_NULL_INDEX;
746 entry->src_next = RLB_NULL_INDEX;
749 static void rlb_init_table_entry(struct rlb_client_info *entry)
751 memset(entry, 0, sizeof(struct rlb_client_info));
752 rlb_init_table_entry_dst(entry);
753 rlb_init_table_entry_src(entry);
756 static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
758 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
759 u32 next_index = bond_info->rx_hashtbl[index].used_next;
760 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
762 if (index == bond_info->rx_hashtbl_used_head)
763 bond_info->rx_hashtbl_used_head = next_index;
764 if (prev_index != RLB_NULL_INDEX)
765 bond_info->rx_hashtbl[prev_index].used_next = next_index;
766 if (next_index != RLB_NULL_INDEX)
767 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
770 /* unlink a rlb hash table entry from the src list */
771 static void rlb_src_unlink(struct bonding *bond, u32 index)
773 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
774 u32 next_index = bond_info->rx_hashtbl[index].src_next;
775 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
777 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
778 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
780 if (next_index != RLB_NULL_INDEX)
781 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
783 if (prev_index == RLB_NULL_INDEX)
786 /* is prev_index pointing to the head of this list? */
787 if (bond_info->rx_hashtbl[prev_index].src_first == index)
788 bond_info->rx_hashtbl[prev_index].src_first = next_index;
790 bond_info->rx_hashtbl[prev_index].src_next = next_index;
794 static void rlb_delete_table_entry(struct bonding *bond, u32 index)
796 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
797 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
799 rlb_delete_table_entry_dst(bond, index);
800 rlb_init_table_entry_dst(entry);
802 rlb_src_unlink(bond, index);
805 /* add the rx_hashtbl[ip_dst_hash] entry to the list
806 * of entries with identical ip_src_hash
808 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
810 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
813 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
814 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
815 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
816 if (next != RLB_NULL_INDEX)
817 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
818 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
821 /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
822 * not match arp->mac_src
824 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
826 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
827 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
830 spin_lock_bh(&bond->mode_lock);
832 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
833 while (index != RLB_NULL_INDEX) {
834 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
835 u32 next_index = entry->src_next;
837 if (entry->ip_src == arp->ip_src &&
838 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
839 rlb_delete_table_entry(bond, index);
842 spin_unlock_bh(&bond->mode_lock);
845 static int rlb_initialize(struct bonding *bond)
847 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
848 struct rlb_client_info *new_hashtbl;
849 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
852 new_hashtbl = kmalloc(size, GFP_KERNEL);
856 spin_lock_bh(&bond->mode_lock);
858 bond_info->rx_hashtbl = new_hashtbl;
860 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
862 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
863 rlb_init_table_entry(bond_info->rx_hashtbl + i);
865 spin_unlock_bh(&bond->mode_lock);
867 /* register to receive ARPs */
868 bond->recv_probe = rlb_arp_recv;
873 static void rlb_deinitialize(struct bonding *bond)
875 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
877 spin_lock_bh(&bond->mode_lock);
879 kfree(bond_info->rx_hashtbl);
880 bond_info->rx_hashtbl = NULL;
881 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
883 spin_unlock_bh(&bond->mode_lock);
886 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
888 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
891 spin_lock_bh(&bond->mode_lock);
893 curr_index = bond_info->rx_hashtbl_used_head;
894 while (curr_index != RLB_NULL_INDEX) {
895 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
896 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
898 if (curr->vlan_id == vlan_id)
899 rlb_delete_table_entry(bond, curr_index);
901 curr_index = next_index;
904 spin_unlock_bh(&bond->mode_lock);
907 /*********************** tlb/rlb shared functions *********************/
909 static void alb_send_lp_vid(struct slave *slave, const u8 mac_addr[],
910 __be16 vlan_proto, u16 vid)
912 struct learning_pkt pkt;
914 int size = sizeof(struct learning_pkt);
916 memset(&pkt, 0, size);
917 ether_addr_copy(pkt.mac_dst, mac_addr);
918 ether_addr_copy(pkt.mac_src, mac_addr);
919 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
921 skb = dev_alloc_skb(size);
925 skb_put_data(skb, &pkt, size);
927 skb_reset_mac_header(skb);
928 skb->network_header = skb->mac_header + ETH_HLEN;
929 skb->protocol = pkt.type;
930 skb->priority = TC_PRIO_CONTROL;
931 skb->dev = slave->dev;
933 slave_dbg(slave->bond->dev, slave->dev,
934 "Send learning packet: mac %pM vlan %d\n", mac_addr, vid);
937 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
942 struct alb_walk_data {
943 struct bonding *bond;
949 static int alb_upper_dev_walk(struct net_device *upper,
950 struct netdev_nested_priv *priv)
952 struct alb_walk_data *data = (struct alb_walk_data *)priv->data;
953 bool strict_match = data->strict_match;
954 const u8 *mac_addr = data->mac_addr;
955 struct bonding *bond = data->bond;
956 struct slave *slave = data->slave;
957 struct bond_vlan_tag *tags;
959 if (is_vlan_dev(upper) &&
960 bond->dev->lower_level == upper->lower_level - 1) {
961 if (upper->addr_assign_type == NET_ADDR_STOLEN) {
962 alb_send_lp_vid(slave, mac_addr,
963 vlan_dev_vlan_proto(upper),
964 vlan_dev_vlan_id(upper));
966 alb_send_lp_vid(slave, upper->dev_addr,
967 vlan_dev_vlan_proto(upper),
968 vlan_dev_vlan_id(upper));
972 /* If this is a macvlan device, then only send updates
973 * when strict_match is turned off.
975 if (netif_is_macvlan(upper) && !strict_match) {
976 tags = bond_verify_device_path(bond->dev, upper, 0);
977 if (IS_ERR_OR_NULL(tags))
979 alb_send_lp_vid(slave, upper->dev_addr,
980 tags[0].vlan_proto, tags[0].vlan_id);
987 static void alb_send_learning_packets(struct slave *slave, const u8 mac_addr[],
990 struct bonding *bond = bond_get_bond_by_slave(slave);
991 struct netdev_nested_priv priv;
992 struct alb_walk_data data = {
993 .strict_match = strict_match,
994 .mac_addr = mac_addr,
999 priv.data = (void *)&data;
1001 alb_send_lp_vid(slave, mac_addr, 0, 0);
1003 /* loop through all devices and see if we need to send a packet
1007 netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &priv);
1011 static int alb_set_slave_mac_addr(struct slave *slave, const u8 addr[],
1014 struct net_device *dev = slave->dev;
1015 struct sockaddr_storage ss;
1017 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1018 __dev_addr_set(dev, addr, len);
1022 /* for rlb each slave must have a unique hw mac addresses so that
1023 * each slave will receive packets destined to a different mac
1025 memcpy(ss.__data, addr, len);
1026 ss.ss_family = dev->type;
1027 if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) {
1028 slave_err(slave->bond->dev, dev, "dev_set_mac_address on slave failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n");
1034 /* Swap MAC addresses between two slaves.
1036 * Called with RTNL held, and no other locks.
1038 static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1040 u8 tmp_mac_addr[MAX_ADDR_LEN];
1042 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1043 slave1->dev->addr_len);
1044 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1045 slave2->dev->addr_len);
1046 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1047 slave1->dev->addr_len);
1051 /* Send learning packets after MAC address swap.
1053 * Called with RTNL and no other locks
1055 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1056 struct slave *slave2)
1058 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1059 struct slave *disabled_slave = NULL;
1063 /* fasten the change in the switch */
1064 if (bond_slave_can_tx(slave1)) {
1065 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1066 if (bond->alb_info.rlb_enabled) {
1067 /* inform the clients that the mac address
1070 rlb_req_update_slave_clients(bond, slave1);
1073 disabled_slave = slave1;
1076 if (bond_slave_can_tx(slave2)) {
1077 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1078 if (bond->alb_info.rlb_enabled) {
1079 /* inform the clients that the mac address
1082 rlb_req_update_slave_clients(bond, slave2);
1085 disabled_slave = slave2;
1088 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1089 /* A disabled slave was assigned an active mac addr */
1090 rlb_teach_disabled_mac_on_primary(bond,
1091 disabled_slave->dev->dev_addr);
1096 * alb_change_hw_addr_on_detach
1097 * @bond: bonding we're working on
1098 * @slave: the slave that was just detached
1100 * We assume that @slave was already detached from the slave list.
1102 * If @slave's permanent hw address is different both from its current
1103 * address and from @bond's address, then somewhere in the bond there's
1104 * a slave that has @slave's permanet address as its current address.
1105 * We'll make sure that slave no longer uses @slave's permanent address.
1107 * Caller must hold RTNL and no other locks
1109 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1113 struct slave *found_slave;
1115 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1116 slave->dev->dev_addr);
1117 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1118 bond->dev->dev_addr);
1120 if (perm_curr_diff && perm_bond_diff) {
1121 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1124 alb_swap_mac_addr(slave, found_slave);
1125 alb_fasten_mac_swap(bond, slave, found_slave);
1131 * alb_handle_addr_collision_on_attach
1132 * @bond: bonding we're working on
1133 * @slave: the slave that was just attached
1135 * checks uniqueness of slave's mac address and handles the case the
1136 * new slave uses the bonds mac address.
1138 * If the permanent hw address of @slave is @bond's hw address, we need to
1139 * find a different hw address to give @slave, that isn't in use by any other
1140 * slave in the bond. This address must be, of course, one of the permanent
1141 * addresses of the other slaves.
1143 * We go over the slave list, and for each slave there we compare its
1144 * permanent hw address with the current address of all the other slaves.
1145 * If no match was found, then we've found a slave with a permanent address
1146 * that isn't used by any other slave in the bond, so we can assign it to
1149 * assumption: this function is called before @slave is attached to the
1152 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1154 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1155 struct slave *tmp_slave1, *free_mac_slave = NULL;
1156 struct list_head *iter;
1158 if (!bond_has_slaves(bond)) {
1159 /* this is the first slave */
1163 /* if slave's mac address differs from bond's mac address
1164 * check uniqueness of slave's mac address against the other
1165 * slaves in the bond.
1167 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1168 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1171 /* Try setting slave mac to bond address and fall-through
1172 * to code handling that situation below...
1174 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1175 bond->dev->addr_len);
1178 /* The slave's address is equal to the address of the bond.
1179 * Search for a spare address in the bond for this slave.
1181 bond_for_each_slave(bond, tmp_slave1, iter) {
1182 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1183 /* no slave has tmp_slave1's perm addr
1186 free_mac_slave = tmp_slave1;
1190 if (!has_bond_addr) {
1191 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1192 bond->dev->dev_addr)) {
1194 has_bond_addr = tmp_slave1;
1199 if (free_mac_slave) {
1200 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1201 free_mac_slave->dev->addr_len);
1203 slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n",
1204 free_mac_slave->dev->name);
1206 } else if (has_bond_addr) {
1207 slave_err(bond->dev, slave->dev, "the slave hw address 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");
1215 * alb_set_mac_address
1216 * @bond: bonding we're working on
1217 * @addr: MAC address to set
1219 * In TLB mode all slaves are configured to the bond's hw address, but set
1220 * their dev_addr field to different addresses (based on their permanent hw
1223 * For each slave, this function sets the interface to the new address and then
1224 * changes its dev_addr field to its previous value.
1226 * Unwinding assumes bond's mac address has not yet changed.
1228 static int alb_set_mac_address(struct bonding *bond, void *addr)
1230 struct slave *slave, *rollback_slave;
1231 struct list_head *iter;
1232 struct sockaddr_storage ss;
1233 char tmp_addr[MAX_ADDR_LEN];
1236 if (bond->alb_info.rlb_enabled)
1239 bond_for_each_slave(bond, slave, iter) {
1240 /* save net_device's current hw address */
1241 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1242 slave->dev->addr_len);
1244 res = dev_set_mac_address(slave->dev, addr, NULL);
1246 /* restore net_device's hw address */
1247 dev_addr_set(slave->dev, tmp_addr);
1256 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1257 ss.ss_family = bond->dev->type;
1259 /* unwind from head to the slave that failed */
1260 bond_for_each_slave(bond, rollback_slave, iter) {
1261 if (rollback_slave == slave)
1263 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1264 rollback_slave->dev->addr_len);
1265 dev_set_mac_address(rollback_slave->dev,
1266 (struct sockaddr *)&ss, NULL);
1267 dev_addr_set(rollback_slave->dev, tmp_addr);
1273 /* determine if the packet is NA or NS */
1274 static bool alb_determine_nd(struct sk_buff *skb, struct bonding *bond)
1276 struct ipv6hdr *ip6hdr;
1277 struct icmp6hdr *hdr;
1279 if (!pskb_network_may_pull(skb, sizeof(*ip6hdr)))
1282 ip6hdr = ipv6_hdr(skb);
1283 if (ip6hdr->nexthdr != IPPROTO_ICMPV6)
1286 if (!pskb_network_may_pull(skb, sizeof(*ip6hdr) + sizeof(*hdr)))
1289 hdr = icmp6_hdr(skb);
1290 return hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
1291 hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION;
1294 /************************ exported alb functions ************************/
1296 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1300 res = tlb_initialize(bond);
1305 res = rlb_initialize(bond);
1307 tlb_deinitialize(bond);
1310 bond->alb_info.rlb_enabled = 1;
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);
1328 static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1329 struct slave *tx_slave)
1331 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1332 struct ethhdr *eth_data = eth_hdr(skb);
1335 /* unbalanced or unassigned, send through primary */
1336 tx_slave = rcu_dereference(bond->curr_active_slave);
1337 if (bond->params.tlb_dynamic_lb)
1338 bond_info->unbalanced_load += skb->len;
1341 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1342 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1343 ether_addr_copy(eth_data->h_source,
1344 tx_slave->dev->dev_addr);
1347 return bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1350 if (tx_slave && bond->params.tlb_dynamic_lb) {
1351 spin_lock(&bond->mode_lock);
1352 __tlb_clear_slave(bond, tx_slave, 0);
1353 spin_unlock(&bond->mode_lock);
1356 /* no suitable interface, frame not sent */
1357 return bond_tx_drop(bond->dev, skb);
1360 struct slave *bond_xmit_tlb_slave_get(struct bonding *bond,
1361 struct sk_buff *skb)
1363 struct slave *tx_slave = NULL;
1364 struct ethhdr *eth_data;
1367 skb_reset_mac_header(skb);
1368 eth_data = eth_hdr(skb);
1370 /* Do not TX balance any multicast or broadcast */
1371 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1372 switch (skb->protocol) {
1373 case htons(ETH_P_IPV6):
1374 if (alb_determine_nd(skb, bond))
1377 case htons(ETH_P_IP):
1378 hash_index = bond_xmit_hash(bond, skb);
1379 if (bond->params.tlb_dynamic_lb) {
1380 tx_slave = tlb_choose_channel(bond,
1384 struct bond_up_slave *slaves;
1387 slaves = rcu_dereference(bond->usable_slaves);
1388 count = slaves ? READ_ONCE(slaves->count) : 0;
1390 tx_slave = slaves->arr[hash_index %
1399 netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1401 struct bonding *bond = netdev_priv(bond_dev);
1402 struct slave *tx_slave;
1404 tx_slave = bond_xmit_tlb_slave_get(bond, skb);
1405 return bond_do_alb_xmit(skb, bond, tx_slave);
1408 struct slave *bond_xmit_alb_slave_get(struct bonding *bond,
1409 struct sk_buff *skb)
1411 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1412 static const __be32 ip_bcast = htonl(0xffffffff);
1413 struct slave *tx_slave = NULL;
1414 const u8 *hash_start = NULL;
1415 bool do_tx_balance = true;
1416 struct ethhdr *eth_data;
1420 skb_reset_mac_header(skb);
1421 eth_data = eth_hdr(skb);
1423 switch (ntohs(skb->protocol)) {
1425 const struct iphdr *iph;
1427 if (is_broadcast_ether_addr(eth_data->h_dest) ||
1428 !pskb_network_may_pull(skb, sizeof(*iph))) {
1429 do_tx_balance = false;
1433 if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) {
1434 do_tx_balance = false;
1437 hash_start = (char *)&(iph->daddr);
1438 hash_size = sizeof(iph->daddr);
1442 const struct ipv6hdr *ip6hdr;
1444 /* IPv6 doesn't really use broadcast mac address, but leave
1445 * that here just in case.
1447 if (is_broadcast_ether_addr(eth_data->h_dest)) {
1448 do_tx_balance = false;
1452 /* IPv6 uses all-nodes multicast as an equivalent to
1453 * broadcasts in IPv4.
1455 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1456 do_tx_balance = false;
1460 if (alb_determine_nd(skb, bond)) {
1461 do_tx_balance = false;
1465 /* The IPv6 header is pulled by alb_determine_nd */
1466 /* Additionally, DAD probes should not be tx-balanced as that
1467 * will lead to false positives for duplicate addresses and
1468 * prevent address configuration from working.
1470 ip6hdr = ipv6_hdr(skb);
1471 if (ipv6_addr_any(&ip6hdr->saddr)) {
1472 do_tx_balance = false;
1476 hash_start = (char *)&ip6hdr->daddr;
1477 hash_size = sizeof(ip6hdr->daddr);
1481 do_tx_balance = false;
1482 if (bond_info->rlb_enabled)
1483 tx_slave = rlb_arp_xmit(skb, bond);
1486 do_tx_balance = false;
1490 if (do_tx_balance) {
1491 if (bond->params.tlb_dynamic_lb) {
1492 hash_index = _simple_hash(hash_start, hash_size);
1493 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1496 * do_tx_balance means we are free to select the tx_slave
1497 * So we do exactly what tlb would do for hash selection
1500 struct bond_up_slave *slaves;
1503 slaves = rcu_dereference(bond->usable_slaves);
1504 count = slaves ? READ_ONCE(slaves->count) : 0;
1506 tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
1513 netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1515 struct bonding *bond = netdev_priv(bond_dev);
1516 struct slave *tx_slave = NULL;
1518 tx_slave = bond_xmit_alb_slave_get(bond, skb);
1519 return bond_do_alb_xmit(skb, bond, tx_slave);
1522 void bond_alb_monitor(struct work_struct *work)
1524 struct bonding *bond = container_of(work, struct bonding,
1526 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1527 struct list_head *iter;
1528 struct slave *slave;
1530 if (!bond_has_slaves(bond)) {
1531 atomic_set(&bond_info->tx_rebalance_counter, 0);
1532 bond_info->lp_counter = 0;
1538 atomic_inc(&bond_info->tx_rebalance_counter);
1539 bond_info->lp_counter++;
1541 /* send learning packets */
1542 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1545 bond_for_each_slave_rcu(bond, slave, iter) {
1546 /* If updating current_active, use all currently
1547 * user mac addresses (!strict_match). Otherwise, only
1548 * use mac of the slave device.
1549 * In RLB mode, we always use strict matches.
1551 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1552 bond_info->rlb_enabled);
1553 alb_send_learning_packets(slave, slave->dev->dev_addr,
1556 bond_info->lp_counter = 0;
1559 /* rebalance tx traffic */
1560 if (atomic_read(&bond_info->tx_rebalance_counter) >= BOND_TLB_REBALANCE_TICKS) {
1561 bond_for_each_slave_rcu(bond, slave, iter) {
1562 tlb_clear_slave(bond, slave, 1);
1563 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1564 SLAVE_TLB_INFO(slave).load =
1565 bond_info->unbalanced_load /
1566 BOND_TLB_REBALANCE_INTERVAL;
1567 bond_info->unbalanced_load = 0;
1570 atomic_set(&bond_info->tx_rebalance_counter, 0);
1573 if (bond_info->rlb_enabled) {
1574 if (bond_info->primary_is_promisc &&
1575 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1577 /* dev_set_promiscuity requires rtnl and
1578 * nothing else. Avoid race with bond_close.
1581 if (!rtnl_trylock())
1584 bond_info->rlb_promisc_timeout_counter = 0;
1586 /* If the primary was set to promiscuous mode
1587 * because a slave was disabled then
1588 * it can now leave promiscuous mode.
1590 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1592 bond_info->primary_is_promisc = 0;
1598 if (bond_info->rlb_rebalance) {
1599 bond_info->rlb_rebalance = 0;
1600 rlb_rebalance(bond);
1603 /* check if clients need updating */
1604 if (bond_info->rx_ntt) {
1605 if (bond_info->rlb_update_delay_counter) {
1606 --bond_info->rlb_update_delay_counter;
1608 rlb_update_rx_clients(bond);
1609 if (bond_info->rlb_update_retry_counter)
1610 --bond_info->rlb_update_retry_counter;
1612 bond_info->rx_ntt = 0;
1618 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1621 /* assumption: called before the slave is attached to the bond
1622 * and not locked by the bond lock
1624 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1628 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1629 slave->dev->addr_len);
1633 res = alb_handle_addr_collision_on_attach(bond, slave);
1637 tlb_init_slave(slave);
1639 /* order a rebalance ASAP */
1640 atomic_set(&bond->alb_info.tx_rebalance_counter,
1641 BOND_TLB_REBALANCE_TICKS);
1643 if (bond->alb_info.rlb_enabled)
1644 bond->alb_info.rlb_rebalance = 1;
1649 /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1652 * Caller must hold RTNL and no other locks
1654 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1656 if (bond_has_slaves(bond))
1657 alb_change_hw_addr_on_detach(bond, slave);
1659 tlb_clear_slave(bond, slave, 0);
1661 if (bond->alb_info.rlb_enabled) {
1662 bond->alb_info.rx_slave = NULL;
1663 rlb_clear_slave(bond, slave);
1668 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1670 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1672 if (link == BOND_LINK_DOWN) {
1673 tlb_clear_slave(bond, slave, 0);
1674 if (bond->alb_info.rlb_enabled)
1675 rlb_clear_slave(bond, slave);
1676 } else if (link == BOND_LINK_UP) {
1677 /* order a rebalance ASAP */
1678 atomic_set(&bond_info->tx_rebalance_counter,
1679 BOND_TLB_REBALANCE_TICKS);
1680 if (bond->alb_info.rlb_enabled) {
1681 bond->alb_info.rlb_rebalance = 1;
1682 /* If the updelay module parameter is smaller than the
1683 * forwarding delay of the switch the rebalance will
1684 * not work because the rebalance arp replies will
1685 * not be forwarded to the clients..
1690 if (bond_is_nondyn_tlb(bond)) {
1691 if (bond_update_slave_arr(bond, NULL))
1692 pr_err("Failed to build slave-array for TLB mode.\n");
1697 * bond_alb_handle_active_change - assign new curr_active_slave
1698 * @bond: our bonding struct
1699 * @new_slave: new slave to assign
1701 * Set the bond->curr_active_slave to @new_slave and handle
1702 * mac address swapping and promiscuity changes as needed.
1704 * Caller must hold RTNL
1706 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1708 struct slave *swap_slave;
1709 struct slave *curr_active;
1711 curr_active = rtnl_dereference(bond->curr_active_slave);
1712 if (curr_active == new_slave)
1715 if (curr_active && bond->alb_info.primary_is_promisc) {
1716 dev_set_promiscuity(curr_active->dev, -1);
1717 bond->alb_info.primary_is_promisc = 0;
1718 bond->alb_info.rlb_promisc_timeout_counter = 0;
1721 swap_slave = curr_active;
1722 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1724 if (!new_slave || !bond_has_slaves(bond))
1727 /* set the new curr_active_slave to the bonds mac address
1728 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1731 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1733 /* Arrange for swap_slave and new_slave to temporarily be
1734 * ignored so we can mess with their MAC addresses without
1735 * fear of interference from transmit activity.
1738 tlb_clear_slave(bond, swap_slave, 1);
1739 tlb_clear_slave(bond, new_slave, 1);
1741 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1742 * and thus filter bond->dev_addr's packets, so force bond's mac
1744 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1745 struct sockaddr_storage ss;
1746 u8 tmp_addr[MAX_ADDR_LEN];
1748 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1749 new_slave->dev->addr_len);
1751 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1752 bond->dev->addr_len);
1753 ss.ss_family = bond->dev->type;
1754 /* we don't care if it can't change its mac, best effort */
1755 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss,
1758 dev_addr_set(new_slave->dev, tmp_addr);
1761 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1763 /* swap mac address */
1764 alb_swap_mac_addr(swap_slave, new_slave);
1765 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1767 /* set the new_slave to the bond mac address */
1768 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1769 bond->dev->addr_len);
1770 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1775 /* Called with RTNL */
1776 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1778 struct bonding *bond = netdev_priv(bond_dev);
1779 struct sockaddr_storage *ss = addr;
1780 struct slave *curr_active;
1781 struct slave *swap_slave;
1784 if (!is_valid_ether_addr(ss->__data))
1785 return -EADDRNOTAVAIL;
1787 res = alb_set_mac_address(bond, addr);
1791 dev_addr_set(bond_dev, ss->__data);
1793 /* If there is no curr_active_slave there is nothing else to do.
1794 * Otherwise we'll need to pass the new address to it and handle
1797 curr_active = rtnl_dereference(bond->curr_active_slave);
1801 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1804 alb_swap_mac_addr(swap_slave, curr_active);
1805 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1807 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1808 bond_dev->addr_len);
1810 alb_send_learning_packets(curr_active,
1811 bond_dev->dev_addr, false);
1812 if (bond->alb_info.rlb_enabled) {
1813 /* inform clients mac address has changed */
1814 rlb_req_update_slave_clients(bond, curr_active);
1821 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1823 if (bond->alb_info.rlb_enabled)
1824 rlb_clear_vlan(bond, vlan_id);