fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / net / bonding / bond_alb.c
blobaea2217c56ebeb327f1dd81dbbcdb45a716eeedf
1 /*
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
12 * for more details.
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 BONDING_DEBUG 1
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>
32 #include <linux/ip.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>
38 #include <linux/in.h>
39 #include <net/ipx.h>
40 #include <net/arp.h>
41 #include <asm/byteorder.h>
42 #include "bonding.h"
43 #include "bond_alb.h"
46 #define ALB_TIMER_TICKS_PER_SEC 10 /* should be a divisor of HZ */
47 #define BOND_TLB_REBALANCE_INTERVAL 10 /* In seconds, periodic re-balancing.
48 * Used for division - never set
49 * to zero !!!
51 #define BOND_ALB_LP_INTERVAL 1 /* In seconds, periodic send of
52 * learning packets to the switch
55 #define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \
56 * ALB_TIMER_TICKS_PER_SEC)
58 #define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \
59 * ALB_TIMER_TICKS_PER_SEC)
61 #define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table.
62 * Note that this value MUST NOT be smaller
63 * because the key hash table is BYTE wide !
67 #define TLB_NULL_INDEX 0xffffffff
68 #define MAX_LP_BURST 3
70 /* rlb defs */
71 #define RLB_HASH_TABLE_SIZE 256
72 #define RLB_NULL_INDEX 0xffffffff
73 #define RLB_UPDATE_DELAY 2*ALB_TIMER_TICKS_PER_SEC /* 2 seconds */
74 #define RLB_ARP_BURST_SIZE 2
75 #define RLB_UPDATE_RETRY 3 /* 3-ticks - must be smaller than the rlb
76 * rebalance interval (5 min).
78 /* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is
79 * promiscuous after failover
81 #define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC
83 static const u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
84 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
86 #pragma pack(1)
87 struct learning_pkt {
88 u8 mac_dst[ETH_ALEN];
89 u8 mac_src[ETH_ALEN];
90 __be16 type;
91 u8 padding[ETH_ZLEN - ETH_HLEN];
94 struct arp_pkt {
95 __be16 hw_addr_space;
96 __be16 prot_addr_space;
97 u8 hw_addr_len;
98 u8 prot_addr_len;
99 __be16 op_code;
100 u8 mac_src[ETH_ALEN]; /* sender hardware address */
101 __be32 ip_src; /* sender IP address */
102 u8 mac_dst[ETH_ALEN]; /* target hardware address */
103 __be32 ip_dst; /* target IP address */
105 #pragma pack()
107 static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
109 return (struct arp_pkt *)skb_network_header(skb);
112 /* Forward declaration */
113 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
115 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
117 int i;
118 u8 hash = 0;
120 for (i = 0; i < hash_size; i++) {
121 hash ^= hash_start[i];
124 return hash;
127 /*********************** tlb specific functions ***************************/
129 static inline void _lock_tx_hashtbl(struct bonding *bond)
131 spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
134 static inline void _unlock_tx_hashtbl(struct bonding *bond)
136 spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
139 /* Caller must hold tx_hashtbl lock */
140 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
142 if (save_load) {
143 entry->load_history = 1 + entry->tx_bytes /
144 BOND_TLB_REBALANCE_INTERVAL;
145 entry->tx_bytes = 0;
148 entry->tx_slave = NULL;
149 entry->next = TLB_NULL_INDEX;
150 entry->prev = TLB_NULL_INDEX;
153 static inline void tlb_init_slave(struct slave *slave)
155 SLAVE_TLB_INFO(slave).load = 0;
156 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
159 /* Caller must hold bond lock for read */
160 static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
162 struct tlb_client_info *tx_hash_table;
163 u32 index;
165 _lock_tx_hashtbl(bond);
167 /* clear slave from tx_hashtbl */
168 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
170 index = SLAVE_TLB_INFO(slave).head;
171 while (index != TLB_NULL_INDEX) {
172 u32 next_index = tx_hash_table[index].next;
173 tlb_init_table_entry(&tx_hash_table[index], save_load);
174 index = next_index;
177 tlb_init_slave(slave);
179 _unlock_tx_hashtbl(bond);
182 /* Must be called before starting the monitor timer */
183 static int tlb_initialize(struct bonding *bond)
185 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
186 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
187 struct tlb_client_info *new_hashtbl;
188 int i;
190 spin_lock_init(&(bond_info->tx_hashtbl_lock));
192 new_hashtbl = kzalloc(size, GFP_KERNEL);
193 if (!new_hashtbl) {
194 printk(KERN_ERR DRV_NAME
195 ": %s: Error: Failed to allocate TLB hash table\n",
196 bond->dev->name);
197 return -1;
199 _lock_tx_hashtbl(bond);
201 bond_info->tx_hashtbl = new_hashtbl;
203 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
204 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
207 _unlock_tx_hashtbl(bond);
209 return 0;
212 /* Must be called only after all slaves have been released */
213 static void tlb_deinitialize(struct bonding *bond)
215 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
217 _lock_tx_hashtbl(bond);
219 kfree(bond_info->tx_hashtbl);
220 bond_info->tx_hashtbl = NULL;
222 _unlock_tx_hashtbl(bond);
225 /* Caller must hold bond lock for read */
226 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
228 struct slave *slave, *least_loaded;
229 s64 max_gap;
230 int i, found = 0;
232 /* Find the first enabled slave */
233 bond_for_each_slave(bond, slave, i) {
234 if (SLAVE_IS_OK(slave)) {
235 found = 1;
236 break;
240 if (!found) {
241 return NULL;
244 least_loaded = slave;
245 max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */
246 (s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
248 /* Find the slave with the largest gap */
249 bond_for_each_slave_from(bond, slave, i, least_loaded) {
250 if (SLAVE_IS_OK(slave)) {
251 s64 gap = (s64)(slave->speed << 20) -
252 (s64)(SLAVE_TLB_INFO(slave).load << 3);
253 if (max_gap < gap) {
254 least_loaded = slave;
255 max_gap = gap;
260 return least_loaded;
263 /* Caller must hold bond lock for read */
264 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
266 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
267 struct tlb_client_info *hash_table;
268 struct slave *assigned_slave;
270 _lock_tx_hashtbl(bond);
272 hash_table = bond_info->tx_hashtbl;
273 assigned_slave = hash_table[hash_index].tx_slave;
274 if (!assigned_slave) {
275 assigned_slave = tlb_get_least_loaded_slave(bond);
277 if (assigned_slave) {
278 struct tlb_slave_info *slave_info =
279 &(SLAVE_TLB_INFO(assigned_slave));
280 u32 next_index = slave_info->head;
282 hash_table[hash_index].tx_slave = assigned_slave;
283 hash_table[hash_index].next = next_index;
284 hash_table[hash_index].prev = TLB_NULL_INDEX;
286 if (next_index != TLB_NULL_INDEX) {
287 hash_table[next_index].prev = hash_index;
290 slave_info->head = hash_index;
291 slave_info->load +=
292 hash_table[hash_index].load_history;
296 if (assigned_slave) {
297 hash_table[hash_index].tx_bytes += skb_len;
300 _unlock_tx_hashtbl(bond);
302 return assigned_slave;
305 /*********************** rlb specific functions ***************************/
306 static inline void _lock_rx_hashtbl(struct bonding *bond)
308 spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
311 static inline void _unlock_rx_hashtbl(struct bonding *bond)
313 spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
316 /* when an ARP REPLY is received from a client update its info
317 * in the rx_hashtbl
319 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
321 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
322 struct rlb_client_info *client_info;
323 u32 hash_index;
325 _lock_rx_hashtbl(bond);
327 hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
328 client_info = &(bond_info->rx_hashtbl[hash_index]);
330 if ((client_info->assigned) &&
331 (client_info->ip_src == arp->ip_dst) &&
332 (client_info->ip_dst == arp->ip_src)) {
333 /* update the clients MAC address */
334 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
335 client_info->ntt = 1;
336 bond_info->rx_ntt = 1;
339 _unlock_rx_hashtbl(bond);
342 static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev)
344 struct bonding *bond = bond_dev->priv;
345 struct arp_pkt *arp = (struct arp_pkt *)skb->data;
346 int res = NET_RX_DROP;
348 if (bond_dev->nd_net != &init_net)
349 goto out;
351 if (!(bond_dev->flags & IFF_MASTER))
352 goto out;
354 if (!arp) {
355 dprintk("Packet has no ARP data\n");
356 goto out;
359 if (skb->len < sizeof(struct arp_pkt)) {
360 dprintk("Packet is too small to be an ARP\n");
361 goto out;
364 if (arp->op_code == htons(ARPOP_REPLY)) {
365 /* update rx hash table for this ARP */
366 rlb_update_entry_from_arp(bond, arp);
367 dprintk("Server received an ARP Reply from client\n");
370 res = NET_RX_SUCCESS;
372 out:
373 dev_kfree_skb(skb);
375 return res;
378 /* Caller must hold bond lock for read */
379 static struct slave *rlb_next_rx_slave(struct bonding *bond)
381 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
382 struct slave *rx_slave, *slave, *start_at;
383 int i = 0;
385 if (bond_info->next_rx_slave) {
386 start_at = bond_info->next_rx_slave;
387 } else {
388 start_at = bond->first_slave;
391 rx_slave = NULL;
393 bond_for_each_slave_from(bond, slave, i, start_at) {
394 if (SLAVE_IS_OK(slave)) {
395 if (!rx_slave) {
396 rx_slave = slave;
397 } else if (slave->speed > rx_slave->speed) {
398 rx_slave = slave;
403 if (rx_slave) {
404 bond_info->next_rx_slave = rx_slave->next;
407 return rx_slave;
410 /* teach the switch the mac of a disabled slave
411 * on the primary for fault tolerance
413 * Caller must hold bond->curr_slave_lock for write or bond lock for write
415 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
417 if (!bond->curr_active_slave) {
418 return;
421 if (!bond->alb_info.primary_is_promisc) {
422 bond->alb_info.primary_is_promisc = 1;
423 dev_set_promiscuity(bond->curr_active_slave->dev, 1);
426 bond->alb_info.rlb_promisc_timeout_counter = 0;
428 alb_send_learning_packets(bond->curr_active_slave, addr);
431 /* slave being removed should not be active at this point
433 * Caller must hold bond lock for read
435 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
437 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
438 struct rlb_client_info *rx_hash_table;
439 u32 index, next_index;
441 /* clear slave from rx_hashtbl */
442 _lock_rx_hashtbl(bond);
444 rx_hash_table = bond_info->rx_hashtbl;
445 index = bond_info->rx_hashtbl_head;
446 for (; index != RLB_NULL_INDEX; index = next_index) {
447 next_index = rx_hash_table[index].next;
448 if (rx_hash_table[index].slave == slave) {
449 struct slave *assigned_slave = rlb_next_rx_slave(bond);
451 if (assigned_slave) {
452 rx_hash_table[index].slave = assigned_slave;
453 if (memcmp(rx_hash_table[index].mac_dst,
454 mac_bcast, ETH_ALEN)) {
455 bond_info->rx_hashtbl[index].ntt = 1;
456 bond_info->rx_ntt = 1;
457 /* A slave has been removed from the
458 * table because it is either disabled
459 * or being released. We must retry the
460 * update to avoid clients from not
461 * being updated & disconnecting when
462 * there is stress
464 bond_info->rlb_update_retry_counter =
465 RLB_UPDATE_RETRY;
467 } else { /* there is no active slave */
468 rx_hash_table[index].slave = NULL;
473 _unlock_rx_hashtbl(bond);
475 write_lock(&bond->curr_slave_lock);
477 if (slave != bond->curr_active_slave) {
478 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
481 write_unlock(&bond->curr_slave_lock);
484 static void rlb_update_client(struct rlb_client_info *client_info)
486 int i;
488 if (!client_info->slave) {
489 return;
492 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
493 struct sk_buff *skb;
495 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
496 client_info->ip_dst,
497 client_info->slave->dev,
498 client_info->ip_src,
499 client_info->mac_dst,
500 client_info->slave->dev->dev_addr,
501 client_info->mac_dst);
502 if (!skb) {
503 printk(KERN_ERR DRV_NAME
504 ": %s: Error: failed to create an ARP packet\n",
505 client_info->slave->dev->master->name);
506 continue;
509 skb->dev = client_info->slave->dev;
511 if (client_info->tag) {
512 skb = vlan_put_tag(skb, client_info->vlan_id);
513 if (!skb) {
514 printk(KERN_ERR DRV_NAME
515 ": %s: Error: failed to insert VLAN tag\n",
516 client_info->slave->dev->master->name);
517 continue;
521 arp_xmit(skb);
525 /* sends ARP REPLIES that update the clients that need updating */
526 static void rlb_update_rx_clients(struct bonding *bond)
528 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
529 struct rlb_client_info *client_info;
530 u32 hash_index;
532 _lock_rx_hashtbl(bond);
534 hash_index = bond_info->rx_hashtbl_head;
535 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
536 client_info = &(bond_info->rx_hashtbl[hash_index]);
537 if (client_info->ntt) {
538 rlb_update_client(client_info);
539 if (bond_info->rlb_update_retry_counter == 0) {
540 client_info->ntt = 0;
545 /* do not update the entries again untill this counter is zero so that
546 * not to confuse the clients.
548 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
550 _unlock_rx_hashtbl(bond);
553 /* The slave was assigned a new mac address - update the clients */
554 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
556 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
557 struct rlb_client_info *client_info;
558 int ntt = 0;
559 u32 hash_index;
561 _lock_rx_hashtbl(bond);
563 hash_index = bond_info->rx_hashtbl_head;
564 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
565 client_info = &(bond_info->rx_hashtbl[hash_index]);
567 if ((client_info->slave == slave) &&
568 memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
569 client_info->ntt = 1;
570 ntt = 1;
574 // update the team's flag only after the whole iteration
575 if (ntt) {
576 bond_info->rx_ntt = 1;
577 //fasten the change
578 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
581 _unlock_rx_hashtbl(bond);
584 /* mark all clients using src_ip to be updated */
585 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
587 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
588 struct rlb_client_info *client_info;
589 u32 hash_index;
591 _lock_rx_hashtbl(bond);
593 hash_index = bond_info->rx_hashtbl_head;
594 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
595 client_info = &(bond_info->rx_hashtbl[hash_index]);
597 if (!client_info->slave) {
598 printk(KERN_ERR DRV_NAME
599 ": %s: Error: found a client with no channel in "
600 "the client's hash table\n",
601 bond->dev->name);
602 continue;
604 /*update all clients using this src_ip, that are not assigned
605 * to the team's address (curr_active_slave) and have a known
606 * unicast mac address.
608 if ((client_info->ip_src == src_ip) &&
609 memcmp(client_info->slave->dev->dev_addr,
610 bond->dev->dev_addr, ETH_ALEN) &&
611 memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
612 client_info->ntt = 1;
613 bond_info->rx_ntt = 1;
617 _unlock_rx_hashtbl(bond);
620 /* Caller must hold both bond and ptr locks for read */
621 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
623 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
624 struct arp_pkt *arp = arp_pkt(skb);
625 struct slave *assigned_slave;
626 struct rlb_client_info *client_info;
627 u32 hash_index = 0;
629 _lock_rx_hashtbl(bond);
631 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src));
632 client_info = &(bond_info->rx_hashtbl[hash_index]);
634 if (client_info->assigned) {
635 if ((client_info->ip_src == arp->ip_src) &&
636 (client_info->ip_dst == arp->ip_dst)) {
637 /* the entry is already assigned to this client */
638 if (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) {
639 /* update mac address from arp */
640 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
643 assigned_slave = client_info->slave;
644 if (assigned_slave) {
645 _unlock_rx_hashtbl(bond);
646 return assigned_slave;
648 } else {
649 /* the entry is already assigned to some other client,
650 * move the old client to primary (curr_active_slave) so
651 * that the new client can be assigned to this entry.
653 if (bond->curr_active_slave &&
654 client_info->slave != bond->curr_active_slave) {
655 client_info->slave = bond->curr_active_slave;
656 rlb_update_client(client_info);
660 /* assign a new slave */
661 assigned_slave = rlb_next_rx_slave(bond);
663 if (assigned_slave) {
664 client_info->ip_src = arp->ip_src;
665 client_info->ip_dst = arp->ip_dst;
666 /* arp->mac_dst is broadcast for arp reqeusts.
667 * will be updated with clients actual unicast mac address
668 * upon receiving an arp reply.
670 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
671 client_info->slave = assigned_slave;
673 if (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
674 client_info->ntt = 1;
675 bond->alb_info.rx_ntt = 1;
676 } else {
677 client_info->ntt = 0;
680 if (!list_empty(&bond->vlan_list)) {
681 unsigned short vlan_id;
682 int res = vlan_get_tag(skb, &vlan_id);
683 if (!res) {
684 client_info->tag = 1;
685 client_info->vlan_id = vlan_id;
689 if (!client_info->assigned) {
690 u32 prev_tbl_head = bond_info->rx_hashtbl_head;
691 bond_info->rx_hashtbl_head = hash_index;
692 client_info->next = prev_tbl_head;
693 if (prev_tbl_head != RLB_NULL_INDEX) {
694 bond_info->rx_hashtbl[prev_tbl_head].prev =
695 hash_index;
697 client_info->assigned = 1;
701 _unlock_rx_hashtbl(bond);
703 return assigned_slave;
706 /* chooses (and returns) transmit channel for arp reply
707 * does not choose channel for other arp types since they are
708 * sent on the curr_active_slave
710 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
712 struct arp_pkt *arp = arp_pkt(skb);
713 struct slave *tx_slave = NULL;
715 if (arp->op_code == __constant_htons(ARPOP_REPLY)) {
716 /* the arp must be sent on the selected
717 * rx channel
719 tx_slave = rlb_choose_channel(skb, bond);
720 if (tx_slave) {
721 memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
723 dprintk("Server sent ARP Reply packet\n");
724 } else if (arp->op_code == __constant_htons(ARPOP_REQUEST)) {
725 /* Create an entry in the rx_hashtbl for this client as a
726 * place holder.
727 * When the arp reply is received the entry will be updated
728 * with the correct unicast address of the client.
730 rlb_choose_channel(skb, bond);
732 /* The ARP relpy packets must be delayed so that
733 * they can cancel out the influence of the ARP request.
735 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
737 /* arp requests are broadcast and are sent on the primary
738 * the arp request will collapse all clients on the subnet to
739 * the primary slave. We must register these clients to be
740 * updated with their assigned mac.
742 rlb_req_update_subnet_clients(bond, arp->ip_src);
743 dprintk("Server sent ARP Request packet\n");
746 return tx_slave;
749 /* Caller must hold bond lock for read */
750 static void rlb_rebalance(struct bonding *bond)
752 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
753 struct slave *assigned_slave;
754 struct rlb_client_info *client_info;
755 int ntt;
756 u32 hash_index;
758 _lock_rx_hashtbl(bond);
760 ntt = 0;
761 hash_index = bond_info->rx_hashtbl_head;
762 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
763 client_info = &(bond_info->rx_hashtbl[hash_index]);
764 assigned_slave = rlb_next_rx_slave(bond);
765 if (assigned_slave && (client_info->slave != assigned_slave)) {
766 client_info->slave = assigned_slave;
767 client_info->ntt = 1;
768 ntt = 1;
772 /* update the team's flag only after the whole iteration */
773 if (ntt) {
774 bond_info->rx_ntt = 1;
776 _unlock_rx_hashtbl(bond);
779 /* Caller must hold rx_hashtbl lock */
780 static void rlb_init_table_entry(struct rlb_client_info *entry)
782 memset(entry, 0, sizeof(struct rlb_client_info));
783 entry->next = RLB_NULL_INDEX;
784 entry->prev = RLB_NULL_INDEX;
787 static int rlb_initialize(struct bonding *bond)
789 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
790 struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type);
791 struct rlb_client_info *new_hashtbl;
792 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
793 int i;
795 spin_lock_init(&(bond_info->rx_hashtbl_lock));
797 new_hashtbl = kmalloc(size, GFP_KERNEL);
798 if (!new_hashtbl) {
799 printk(KERN_ERR DRV_NAME
800 ": %s: Error: Failed to allocate RLB hash table\n",
801 bond->dev->name);
802 return -1;
804 _lock_rx_hashtbl(bond);
806 bond_info->rx_hashtbl = new_hashtbl;
808 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
810 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
811 rlb_init_table_entry(bond_info->rx_hashtbl + i);
814 _unlock_rx_hashtbl(bond);
816 /*initialize packet type*/
817 pk_type->type = __constant_htons(ETH_P_ARP);
818 pk_type->dev = bond->dev;
819 pk_type->func = rlb_arp_recv;
821 /* register to receive ARPs */
822 dev_add_pack(pk_type);
824 return 0;
827 static void rlb_deinitialize(struct bonding *bond)
829 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
831 dev_remove_pack(&(bond_info->rlb_pkt_type));
833 _lock_rx_hashtbl(bond);
835 kfree(bond_info->rx_hashtbl);
836 bond_info->rx_hashtbl = NULL;
837 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
839 _unlock_rx_hashtbl(bond);
842 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
844 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
845 u32 curr_index;
847 _lock_rx_hashtbl(bond);
849 curr_index = bond_info->rx_hashtbl_head;
850 while (curr_index != RLB_NULL_INDEX) {
851 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
852 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
853 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
855 if (curr->tag && (curr->vlan_id == vlan_id)) {
856 if (curr_index == bond_info->rx_hashtbl_head) {
857 bond_info->rx_hashtbl_head = next_index;
859 if (prev_index != RLB_NULL_INDEX) {
860 bond_info->rx_hashtbl[prev_index].next = next_index;
862 if (next_index != RLB_NULL_INDEX) {
863 bond_info->rx_hashtbl[next_index].prev = prev_index;
866 rlb_init_table_entry(curr);
869 curr_index = next_index;
872 _unlock_rx_hashtbl(bond);
875 /*********************** tlb/rlb shared functions *********************/
877 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
879 struct bonding *bond = bond_get_bond_by_slave(slave);
880 struct learning_pkt pkt;
881 int size = sizeof(struct learning_pkt);
882 int i;
884 memset(&pkt, 0, size);
885 memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
886 memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
887 pkt.type = __constant_htons(ETH_P_LOOP);
889 for (i = 0; i < MAX_LP_BURST; i++) {
890 struct sk_buff *skb;
891 char *data;
893 skb = dev_alloc_skb(size);
894 if (!skb) {
895 return;
898 data = skb_put(skb, size);
899 memcpy(data, &pkt, size);
901 skb_reset_mac_header(skb);
902 skb->network_header = skb->mac_header + ETH_HLEN;
903 skb->protocol = pkt.type;
904 skb->priority = TC_PRIO_CONTROL;
905 skb->dev = slave->dev;
907 if (!list_empty(&bond->vlan_list)) {
908 struct vlan_entry *vlan;
910 vlan = bond_next_vlan(bond,
911 bond->alb_info.current_alb_vlan);
913 bond->alb_info.current_alb_vlan = vlan;
914 if (!vlan) {
915 kfree_skb(skb);
916 continue;
919 skb = vlan_put_tag(skb, vlan->vlan_id);
920 if (!skb) {
921 printk(KERN_ERR DRV_NAME
922 ": %s: Error: failed to insert VLAN tag\n",
923 bond->dev->name);
924 continue;
928 dev_queue_xmit(skb);
932 /* hw is a boolean parameter that determines whether we should try and
933 * set the hw address of the device as well as the hw address of the
934 * net_device
936 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
938 struct net_device *dev = slave->dev;
939 struct sockaddr s_addr;
941 if (!hw) {
942 memcpy(dev->dev_addr, addr, dev->addr_len);
943 return 0;
946 /* for rlb each slave must have a unique hw mac addresses so that */
947 /* each slave will receive packets destined to a different mac */
948 memcpy(s_addr.sa_data, addr, dev->addr_len);
949 s_addr.sa_family = dev->type;
950 if (dev_set_mac_address(dev, &s_addr)) {
951 printk(KERN_ERR DRV_NAME
952 ": %s: Error: dev_set_mac_address of dev %s failed! ALB "
953 "mode requires that the base driver support setting "
954 "the hw address also when the network device's "
955 "interface is open\n",
956 dev->master->name, dev->name);
957 return -EOPNOTSUPP;
959 return 0;
962 /* Caller must hold bond lock for write or curr_slave_lock for write*/
963 static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
965 struct slave *disabled_slave = NULL;
966 u8 tmp_mac_addr[ETH_ALEN];
967 int slaves_state_differ;
969 slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
971 memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
972 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
973 alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
975 /* fasten the change in the switch */
976 if (SLAVE_IS_OK(slave1)) {
977 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
978 if (bond->alb_info.rlb_enabled) {
979 /* inform the clients that the mac address
980 * has changed
982 rlb_req_update_slave_clients(bond, slave1);
984 } else {
985 disabled_slave = slave1;
988 if (SLAVE_IS_OK(slave2)) {
989 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
990 if (bond->alb_info.rlb_enabled) {
991 /* inform the clients that the mac address
992 * has changed
994 rlb_req_update_slave_clients(bond, slave2);
996 } else {
997 disabled_slave = slave2;
1000 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1001 /* A disabled slave was assigned an active mac addr */
1002 rlb_teach_disabled_mac_on_primary(bond,
1003 disabled_slave->dev->dev_addr);
1008 * alb_change_hw_addr_on_detach
1009 * @bond: bonding we're working on
1010 * @slave: the slave that was just detached
1012 * We assume that @slave was already detached from the slave list.
1014 * If @slave's permanent hw address is different both from its current
1015 * address and from @bond's address, then somewhere in the bond there's
1016 * a slave that has @slave's permanet address as its current address.
1017 * We'll make sure that that slave no longer uses @slave's permanent address.
1019 * Caller must hold bond lock
1021 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1023 int perm_curr_diff;
1024 int perm_bond_diff;
1026 perm_curr_diff = memcmp(slave->perm_hwaddr,
1027 slave->dev->dev_addr,
1028 ETH_ALEN);
1029 perm_bond_diff = memcmp(slave->perm_hwaddr,
1030 bond->dev->dev_addr,
1031 ETH_ALEN);
1033 if (perm_curr_diff && perm_bond_diff) {
1034 struct slave *tmp_slave;
1035 int i, found = 0;
1037 bond_for_each_slave(bond, tmp_slave, i) {
1038 if (!memcmp(slave->perm_hwaddr,
1039 tmp_slave->dev->dev_addr,
1040 ETH_ALEN)) {
1041 found = 1;
1042 break;
1046 if (found) {
1047 alb_swap_mac_addr(bond, slave, tmp_slave);
1053 * alb_handle_addr_collision_on_attach
1054 * @bond: bonding we're working on
1055 * @slave: the slave that was just attached
1057 * checks uniqueness of slave's mac address and handles the case the
1058 * new slave uses the bonds mac address.
1060 * If the permanent hw address of @slave is @bond's hw address, we need to
1061 * find a different hw address to give @slave, that isn't in use by any other
1062 * slave in the bond. This address must be, of course, one of the premanent
1063 * addresses of the other slaves.
1065 * We go over the slave list, and for each slave there we compare its
1066 * permanent hw address with the current address of all the other slaves.
1067 * If no match was found, then we've found a slave with a permanent address
1068 * that isn't used by any other slave in the bond, so we can assign it to
1069 * @slave.
1071 * assumption: this function is called before @slave is attached to the
1072 * bond slave list.
1074 * caller must hold the bond lock for write since the mac addresses are compared
1075 * and may be swapped.
1077 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1079 struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1080 struct slave *has_bond_addr = bond->curr_active_slave;
1081 int i, j, found = 0;
1083 if (bond->slave_cnt == 0) {
1084 /* this is the first slave */
1085 return 0;
1088 /* if slave's mac address differs from bond's mac address
1089 * check uniqueness of slave's mac address against the other
1090 * slaves in the bond.
1092 if (memcmp(slave->perm_hwaddr, bond->dev->dev_addr, ETH_ALEN)) {
1093 bond_for_each_slave(bond, tmp_slave1, i) {
1094 if (!memcmp(tmp_slave1->dev->dev_addr, slave->dev->dev_addr,
1095 ETH_ALEN)) {
1096 found = 1;
1097 break;
1101 if (!found)
1102 return 0;
1104 /* Try setting slave mac to bond address and fall-through
1105 to code handling that situation below... */
1106 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1107 bond->alb_info.rlb_enabled);
1110 /* The slave's address is equal to the address of the bond.
1111 * Search for a spare address in the bond for this slave.
1113 free_mac_slave = NULL;
1115 bond_for_each_slave(bond, tmp_slave1, i) {
1116 found = 0;
1117 bond_for_each_slave(bond, tmp_slave2, j) {
1118 if (!memcmp(tmp_slave1->perm_hwaddr,
1119 tmp_slave2->dev->dev_addr,
1120 ETH_ALEN)) {
1121 found = 1;
1122 break;
1126 if (!found) {
1127 /* no slave has tmp_slave1's perm addr
1128 * as its curr addr
1130 free_mac_slave = tmp_slave1;
1131 break;
1134 if (!has_bond_addr) {
1135 if (!memcmp(tmp_slave1->dev->dev_addr,
1136 bond->dev->dev_addr,
1137 ETH_ALEN)) {
1139 has_bond_addr = tmp_slave1;
1144 if (free_mac_slave) {
1145 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1146 bond->alb_info.rlb_enabled);
1148 printk(KERN_WARNING DRV_NAME
1149 ": %s: Warning: the hw address of slave %s is in use by "
1150 "the bond; giving it the hw address of %s\n",
1151 bond->dev->name, slave->dev->name, free_mac_slave->dev->name);
1153 } else if (has_bond_addr) {
1154 printk(KERN_ERR DRV_NAME
1155 ": %s: Error: the hw address of slave %s is in use by the "
1156 "bond; couldn't find a slave with a free hw address to "
1157 "give it (this should not have happened)\n",
1158 bond->dev->name, slave->dev->name);
1159 return -EFAULT;
1162 return 0;
1166 * alb_set_mac_address
1167 * @bond:
1168 * @addr:
1170 * In TLB mode all slaves are configured to the bond's hw address, but set
1171 * their dev_addr field to different addresses (based on their permanent hw
1172 * addresses).
1174 * For each slave, this function sets the interface to the new address and then
1175 * changes its dev_addr field to its previous value.
1177 * Unwinding assumes bond's mac address has not yet changed.
1179 static int alb_set_mac_address(struct bonding *bond, void *addr)
1181 struct sockaddr sa;
1182 struct slave *slave, *stop_at;
1183 char tmp_addr[ETH_ALEN];
1184 int res;
1185 int i;
1187 if (bond->alb_info.rlb_enabled) {
1188 return 0;
1191 bond_for_each_slave(bond, slave, i) {
1192 if (slave->dev->set_mac_address == NULL) {
1193 res = -EOPNOTSUPP;
1194 goto unwind;
1197 /* save net_device's current hw address */
1198 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1200 res = dev_set_mac_address(slave->dev, addr);
1202 /* restore net_device's hw address */
1203 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1205 if (res) {
1206 goto unwind;
1210 return 0;
1212 unwind:
1213 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1214 sa.sa_family = bond->dev->type;
1216 /* unwind from head to the slave that failed */
1217 stop_at = slave;
1218 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1219 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1220 dev_set_mac_address(slave->dev, &sa);
1221 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1224 return res;
1227 /************************ exported alb funcions ************************/
1229 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1231 int res;
1233 res = tlb_initialize(bond);
1234 if (res) {
1235 return res;
1238 if (rlb_enabled) {
1239 bond->alb_info.rlb_enabled = 1;
1240 /* initialize rlb */
1241 res = rlb_initialize(bond);
1242 if (res) {
1243 tlb_deinitialize(bond);
1244 return res;
1246 } else {
1247 bond->alb_info.rlb_enabled = 0;
1250 return 0;
1253 void bond_alb_deinitialize(struct bonding *bond)
1255 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1257 tlb_deinitialize(bond);
1259 if (bond_info->rlb_enabled) {
1260 rlb_deinitialize(bond);
1264 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1266 struct bonding *bond = bond_dev->priv;
1267 struct ethhdr *eth_data;
1268 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1269 struct slave *tx_slave = NULL;
1270 static const __be32 ip_bcast = htonl(0xffffffff);
1271 int hash_size = 0;
1272 int do_tx_balance = 1;
1273 u32 hash_index = 0;
1274 const u8 *hash_start = NULL;
1275 int res = 1;
1277 skb_reset_mac_header(skb);
1278 eth_data = eth_hdr(skb);
1280 /* make sure that the curr_active_slave and the slaves list do
1281 * not change during tx
1283 read_lock(&bond->lock);
1284 read_lock(&bond->curr_slave_lock);
1286 if (!BOND_IS_OK(bond)) {
1287 goto out;
1290 switch (ntohs(skb->protocol)) {
1291 case ETH_P_IP: {
1292 const struct iphdr *iph = ip_hdr(skb);
1294 if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) ||
1295 (iph->daddr == ip_bcast) ||
1296 (iph->protocol == IPPROTO_IGMP)) {
1297 do_tx_balance = 0;
1298 break;
1300 hash_start = (char *)&(iph->daddr);
1301 hash_size = sizeof(iph->daddr);
1303 break;
1304 case ETH_P_IPV6:
1305 if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {
1306 do_tx_balance = 0;
1307 break;
1310 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1311 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1312 break;
1313 case ETH_P_IPX:
1314 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1315 /* something is wrong with this packet */
1316 do_tx_balance = 0;
1317 break;
1320 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1321 /* The only protocol worth balancing in
1322 * this family since it has an "ARP" like
1323 * mechanism
1325 do_tx_balance = 0;
1326 break;
1329 hash_start = (char*)eth_data->h_dest;
1330 hash_size = ETH_ALEN;
1331 break;
1332 case ETH_P_ARP:
1333 do_tx_balance = 0;
1334 if (bond_info->rlb_enabled) {
1335 tx_slave = rlb_arp_xmit(skb, bond);
1337 break;
1338 default:
1339 do_tx_balance = 0;
1340 break;
1343 if (do_tx_balance) {
1344 hash_index = _simple_hash(hash_start, hash_size);
1345 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1348 if (!tx_slave) {
1349 /* unbalanced or unassigned, send through primary */
1350 tx_slave = bond->curr_active_slave;
1351 bond_info->unbalanced_load += skb->len;
1354 if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1355 if (tx_slave != bond->curr_active_slave) {
1356 memcpy(eth_data->h_source,
1357 tx_slave->dev->dev_addr,
1358 ETH_ALEN);
1361 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1362 } else {
1363 if (tx_slave) {
1364 tlb_clear_slave(bond, tx_slave, 0);
1368 out:
1369 if (res) {
1370 /* no suitable interface, frame not sent */
1371 dev_kfree_skb(skb);
1373 read_unlock(&bond->curr_slave_lock);
1374 read_unlock(&bond->lock);
1375 return 0;
1378 void bond_alb_monitor(struct bonding *bond)
1380 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1381 struct slave *slave;
1382 int i;
1384 read_lock(&bond->lock);
1386 if (bond->kill_timers) {
1387 goto out;
1390 if (bond->slave_cnt == 0) {
1391 bond_info->tx_rebalance_counter = 0;
1392 bond_info->lp_counter = 0;
1393 goto re_arm;
1396 bond_info->tx_rebalance_counter++;
1397 bond_info->lp_counter++;
1399 /* send learning packets */
1400 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1401 /* change of curr_active_slave involves swapping of mac addresses.
1402 * in order to avoid this swapping from happening while
1403 * sending the learning packets, the curr_slave_lock must be held for
1404 * read.
1406 read_lock(&bond->curr_slave_lock);
1408 bond_for_each_slave(bond, slave, i) {
1409 alb_send_learning_packets(slave, slave->dev->dev_addr);
1412 read_unlock(&bond->curr_slave_lock);
1414 bond_info->lp_counter = 0;
1417 /* rebalance tx traffic */
1418 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1420 read_lock(&bond->curr_slave_lock);
1422 bond_for_each_slave(bond, slave, i) {
1423 tlb_clear_slave(bond, slave, 1);
1424 if (slave == bond->curr_active_slave) {
1425 SLAVE_TLB_INFO(slave).load =
1426 bond_info->unbalanced_load /
1427 BOND_TLB_REBALANCE_INTERVAL;
1428 bond_info->unbalanced_load = 0;
1432 read_unlock(&bond->curr_slave_lock);
1434 bond_info->tx_rebalance_counter = 0;
1437 /* handle rlb stuff */
1438 if (bond_info->rlb_enabled) {
1439 /* the following code changes the promiscuity of the
1440 * the curr_active_slave. It needs to be locked with a
1441 * write lock to protect from other code that also
1442 * sets the promiscuity.
1444 write_lock_bh(&bond->curr_slave_lock);
1446 if (bond_info->primary_is_promisc &&
1447 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1449 bond_info->rlb_promisc_timeout_counter = 0;
1451 /* If the primary was set to promiscuous mode
1452 * because a slave was disabled then
1453 * it can now leave promiscuous mode.
1455 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1456 bond_info->primary_is_promisc = 0;
1459 write_unlock_bh(&bond->curr_slave_lock);
1461 if (bond_info->rlb_rebalance) {
1462 bond_info->rlb_rebalance = 0;
1463 rlb_rebalance(bond);
1466 /* check if clients need updating */
1467 if (bond_info->rx_ntt) {
1468 if (bond_info->rlb_update_delay_counter) {
1469 --bond_info->rlb_update_delay_counter;
1470 } else {
1471 rlb_update_rx_clients(bond);
1472 if (bond_info->rlb_update_retry_counter) {
1473 --bond_info->rlb_update_retry_counter;
1474 } else {
1475 bond_info->rx_ntt = 0;
1481 re_arm:
1482 mod_timer(&(bond_info->alb_timer), jiffies + alb_delta_in_ticks);
1483 out:
1484 read_unlock(&bond->lock);
1487 /* assumption: called before the slave is attached to the bond
1488 * and not locked by the bond lock
1490 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1492 int res;
1494 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1495 bond->alb_info.rlb_enabled);
1496 if (res) {
1497 return res;
1500 /* caller must hold the bond lock for write since the mac addresses
1501 * are compared and may be swapped.
1503 write_lock_bh(&bond->lock);
1505 res = alb_handle_addr_collision_on_attach(bond, slave);
1507 write_unlock_bh(&bond->lock);
1509 if (res) {
1510 return res;
1513 tlb_init_slave(slave);
1515 /* order a rebalance ASAP */
1516 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1518 if (bond->alb_info.rlb_enabled) {
1519 bond->alb_info.rlb_rebalance = 1;
1522 return 0;
1525 /* Caller must hold bond lock for write */
1526 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1528 if (bond->slave_cnt > 1) {
1529 alb_change_hw_addr_on_detach(bond, slave);
1532 tlb_clear_slave(bond, slave, 0);
1534 if (bond->alb_info.rlb_enabled) {
1535 bond->alb_info.next_rx_slave = NULL;
1536 rlb_clear_slave(bond, slave);
1540 /* Caller must hold bond lock for read */
1541 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1543 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1545 if (link == BOND_LINK_DOWN) {
1546 tlb_clear_slave(bond, slave, 0);
1547 if (bond->alb_info.rlb_enabled) {
1548 rlb_clear_slave(bond, slave);
1550 } else if (link == BOND_LINK_UP) {
1551 /* order a rebalance ASAP */
1552 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1553 if (bond->alb_info.rlb_enabled) {
1554 bond->alb_info.rlb_rebalance = 1;
1555 /* If the updelay module parameter is smaller than the
1556 * forwarding delay of the switch the rebalance will
1557 * not work because the rebalance arp replies will
1558 * not be forwarded to the clients..
1565 * bond_alb_handle_active_change - assign new curr_active_slave
1566 * @bond: our bonding struct
1567 * @new_slave: new slave to assign
1569 * Set the bond->curr_active_slave to @new_slave and handle
1570 * mac address swapping and promiscuity changes as needed.
1572 * Caller must hold bond curr_slave_lock for write (or bond lock for write)
1574 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1576 struct slave *swap_slave;
1577 int i;
1579 if (bond->curr_active_slave == new_slave) {
1580 return;
1583 if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1584 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1585 bond->alb_info.primary_is_promisc = 0;
1586 bond->alb_info.rlb_promisc_timeout_counter = 0;
1589 swap_slave = bond->curr_active_slave;
1590 bond->curr_active_slave = new_slave;
1592 if (!new_slave || (bond->slave_cnt == 0)) {
1593 return;
1596 /* set the new curr_active_slave to the bonds mac address
1597 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1599 if (!swap_slave) {
1600 struct slave *tmp_slave;
1601 /* find slave that is holding the bond's mac address */
1602 bond_for_each_slave(bond, tmp_slave, i) {
1603 if (!memcmp(tmp_slave->dev->dev_addr,
1604 bond->dev->dev_addr, ETH_ALEN)) {
1605 swap_slave = tmp_slave;
1606 break;
1611 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1612 if (swap_slave) {
1613 /* swap mac address */
1614 alb_swap_mac_addr(bond, swap_slave, new_slave);
1615 } else {
1616 /* set the new_slave to the bond mac address */
1617 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1618 bond->alb_info.rlb_enabled);
1619 /* fasten bond mac on new current slave */
1620 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1624 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1626 struct bonding *bond = bond_dev->priv;
1627 struct sockaddr *sa = addr;
1628 struct slave *slave, *swap_slave;
1629 int res;
1630 int i;
1632 if (!is_valid_ether_addr(sa->sa_data)) {
1633 return -EADDRNOTAVAIL;
1636 res = alb_set_mac_address(bond, addr);
1637 if (res) {
1638 return res;
1641 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1643 /* If there is no curr_active_slave there is nothing else to do.
1644 * Otherwise we'll need to pass the new address to it and handle
1645 * duplications.
1647 if (!bond->curr_active_slave) {
1648 return 0;
1651 swap_slave = NULL;
1653 bond_for_each_slave(bond, slave, i) {
1654 if (!memcmp(slave->dev->dev_addr, bond_dev->dev_addr, ETH_ALEN)) {
1655 swap_slave = slave;
1656 break;
1660 if (swap_slave) {
1661 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
1662 } else {
1663 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
1664 bond->alb_info.rlb_enabled);
1666 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1667 if (bond->alb_info.rlb_enabled) {
1668 /* inform clients mac address has changed */
1669 rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1673 return 0;
1676 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1678 if (bond->alb_info.current_alb_vlan &&
1679 (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1680 bond->alb_info.current_alb_vlan = NULL;
1683 if (bond->alb_info.rlb_enabled) {
1684 rlb_clear_vlan(bond, vlan_id);