blob: 106b88a04738fb25fa5bd850537653beaa5b4aa5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
3 *
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.
8 *
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.
13 *
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.
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 */
22
Joe Perchesa4aee5c2009-12-13 20:06:07 -080023#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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>
Vlad Yasevich2d1ea192008-08-28 15:38:41 -040041#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <asm/byteorder.h>
43#include "bonding.h"
44#include "bond_alb.h"
45
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Eric Dumazet885a1362009-09-01 06:31:18 +000048#ifndef __long_aligned
49#define __long_aligned __attribute__((aligned((sizeof(long)))))
50#endif
51static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
52 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
53};
54static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
55 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
56};
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
58
59#pragma pack(1)
60struct learning_pkt {
61 u8 mac_dst[ETH_ALEN];
62 u8 mac_src[ETH_ALEN];
Al Virod3bb52b2007-08-22 20:06:58 -040063 __be16 type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 u8 padding[ETH_ZLEN - ETH_HLEN];
65};
66
67struct arp_pkt {
Al Virod3bb52b2007-08-22 20:06:58 -040068 __be16 hw_addr_space;
69 __be16 prot_addr_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 u8 hw_addr_len;
71 u8 prot_addr_len;
Al Virod3bb52b2007-08-22 20:06:58 -040072 __be16 op_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 u8 mac_src[ETH_ALEN]; /* sender hardware address */
Al Virod3bb52b2007-08-22 20:06:58 -040074 __be32 ip_src; /* sender IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 u8 mac_dst[ETH_ALEN]; /* target hardware address */
Al Virod3bb52b2007-08-22 20:06:58 -040076 __be32 ip_dst; /* target IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077};
78#pragma pack()
79
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -030080static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
81{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -070082 return (struct arp_pkt *)skb_network_header(skb);
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -030083}
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085/* Forward declaration */
86static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
87
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070088static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
90 int i;
91 u8 hash = 0;
92
93 for (i = 0; i < hash_size; i++) {
94 hash ^= hash_start[i];
95 }
96
97 return hash;
98}
99
100/*********************** tlb specific functions ***************************/
101
102static inline void _lock_tx_hashtbl(struct bonding *bond)
103{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700104 spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
107static inline void _unlock_tx_hashtbl(struct bonding *bond)
108{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700109 spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
112/* Caller must hold tx_hashtbl lock */
113static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
114{
115 if (save_load) {
116 entry->load_history = 1 + entry->tx_bytes /
117 BOND_TLB_REBALANCE_INTERVAL;
118 entry->tx_bytes = 0;
119 }
120
121 entry->tx_slave = NULL;
122 entry->next = TLB_NULL_INDEX;
123 entry->prev = TLB_NULL_INDEX;
124}
125
126static inline void tlb_init_slave(struct slave *slave)
127{
128 SLAVE_TLB_INFO(slave).load = 0;
129 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
130}
131
132/* Caller must hold bond lock for read */
133static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
134{
135 struct tlb_client_info *tx_hash_table;
136 u32 index;
137
138 _lock_tx_hashtbl(bond);
139
140 /* clear slave from tx_hashtbl */
141 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
142
Andy Gospodarekce39a802008-10-30 17:41:16 -0700143 /* skip this if we've already freed the tx hash table */
144 if (tx_hash_table) {
145 index = SLAVE_TLB_INFO(slave).head;
146 while (index != TLB_NULL_INDEX) {
147 u32 next_index = tx_hash_table[index].next;
148 tlb_init_table_entry(&tx_hash_table[index], save_load);
149 index = next_index;
150 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 tlb_init_slave(slave);
Jay Vosburgh5af47b22006-01-09 12:14:00 -0800154
155 _unlock_tx_hashtbl(bond);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
158/* Must be called before starting the monitor timer */
159static int tlb_initialize(struct bonding *bond)
160{
161 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
162 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
Mitch Williams0d206a32005-11-09 10:35:30 -0800163 struct tlb_client_info *new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 int i;
165
Joe Jin243cb4e2007-02-06 14:16:40 -0800166 new_hashtbl = kzalloc(size, GFP_KERNEL);
Mitch Williams0d206a32005-11-09 10:35:30 -0800167 if (!new_hashtbl) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -0800168 pr_err("%s: Error: Failed to allocate TLB hash table\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return -1;
171 }
Mitch Williams0d206a32005-11-09 10:35:30 -0800172 _lock_tx_hashtbl(bond);
173
174 bond_info->tx_hashtbl = new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
Peter Pan(潘卫平)38dbaf02011-04-08 03:40:19 +0000177 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179
180 _unlock_tx_hashtbl(bond);
181
182 return 0;
183}
184
185/* Must be called only after all slaves have been released */
186static void tlb_deinitialize(struct bonding *bond)
187{
188 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
189
190 _lock_tx_hashtbl(bond);
191
192 kfree(bond_info->tx_hashtbl);
193 bond_info->tx_hashtbl = NULL;
194
195 _unlock_tx_hashtbl(bond);
196}
197
Jiri Pirko097811b2010-05-19 03:26:39 +0000198static long long compute_gap(struct slave *slave)
199{
200 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
201 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
202}
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204/* Caller must hold bond lock for read */
205static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
206{
207 struct slave *slave, *least_loaded;
Jiri Pirko097811b2010-05-19 03:26:39 +0000208 long long max_gap;
209 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Jiri Pirko097811b2010-05-19 03:26:39 +0000211 least_loaded = NULL;
212 max_gap = LLONG_MIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 /* Find the slave with the largest gap */
Jiri Pirko097811b2010-05-19 03:26:39 +0000215 bond_for_each_slave(bond, slave, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (SLAVE_IS_OK(slave)) {
Jiri Pirko097811b2010-05-19 03:26:39 +0000217 long long gap = compute_gap(slave);
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 if (max_gap < gap) {
220 least_loaded = slave;
221 max_gap = gap;
222 }
223 }
224 }
225
226 return least_loaded;
227}
228
229/* Caller must hold bond lock for read */
230static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
231{
232 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
233 struct tlb_client_info *hash_table;
234 struct slave *assigned_slave;
235
236 _lock_tx_hashtbl(bond);
237
238 hash_table = bond_info->tx_hashtbl;
239 assigned_slave = hash_table[hash_index].tx_slave;
240 if (!assigned_slave) {
241 assigned_slave = tlb_get_least_loaded_slave(bond);
242
243 if (assigned_slave) {
244 struct tlb_slave_info *slave_info =
245 &(SLAVE_TLB_INFO(assigned_slave));
246 u32 next_index = slave_info->head;
247
248 hash_table[hash_index].tx_slave = assigned_slave;
249 hash_table[hash_index].next = next_index;
250 hash_table[hash_index].prev = TLB_NULL_INDEX;
251
252 if (next_index != TLB_NULL_INDEX) {
253 hash_table[next_index].prev = hash_index;
254 }
255
256 slave_info->head = hash_index;
257 slave_info->load +=
258 hash_table[hash_index].load_history;
259 }
260 }
261
262 if (assigned_slave) {
263 hash_table[hash_index].tx_bytes += skb_len;
264 }
265
266 _unlock_tx_hashtbl(bond);
267
268 return assigned_slave;
269}
270
271/*********************** rlb specific functions ***************************/
272static inline void _lock_rx_hashtbl(struct bonding *bond)
273{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700274 spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
277static inline void _unlock_rx_hashtbl(struct bonding *bond)
278{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700279 spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
282/* when an ARP REPLY is received from a client update its info
283 * in the rx_hashtbl
284 */
285static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
286{
287 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
288 struct rlb_client_info *client_info;
289 u32 hash_index;
290
291 _lock_rx_hashtbl(bond);
292
293 hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
294 client_info = &(bond_info->rx_hashtbl[hash_index]);
295
296 if ((client_info->assigned) &&
297 (client_info->ip_src == arp->ip_dst) &&
Flavio Leitner42d782a2010-06-29 08:24:39 +0000298 (client_info->ip_dst == arp->ip_src) &&
299 (compare_ether_addr_64bits(client_info->mac_dst, arp->mac_src))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 /* update the clients MAC address */
301 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
302 client_info->ntt = 1;
303 bond_info->rx_ntt = 1;
304 }
305
306 _unlock_rx_hashtbl(bond);
307}
308
Jiri Pirko3aba8912011-04-19 03:48:16 +0000309static void rlb_arp_recv(struct sk_buff *skb, struct bonding *bond,
310 struct slave *slave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Jiri Pirko3aba8912011-04-19 03:48:16 +0000312 struct arp_pkt *arp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Jiri Pirko3aba8912011-04-19 03:48:16 +0000314 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
315 return;
Jay Vosburgh6146b1a2008-11-04 17:51:15 -0800316
Jiri Pirko3aba8912011-04-19 03:48:16 +0000317 arp = (struct arp_pkt *) skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 if (!arp) {
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800319 pr_debug("Packet has no ARP data\n");
Jiri Pirko3aba8912011-04-19 03:48:16 +0000320 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 }
322
Jiri Pirko3aba8912011-04-19 03:48:16 +0000323 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
324 return;
Andy Gospodarekab128112010-09-10 11:43:20 +0000325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 if (skb->len < sizeof(struct arp_pkt)) {
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800327 pr_debug("Packet is too small to be an ARP\n");
Jiri Pirko3aba8912011-04-19 03:48:16 +0000328 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 }
330
331 if (arp->op_code == htons(ARPOP_REPLY)) {
332 /* update rx hash table for this ARP */
333 rlb_update_entry_from_arp(bond, arp);
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800334 pr_debug("Server received an ARP Reply from client\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336}
337
338/* Caller must hold bond lock for read */
339static struct slave *rlb_next_rx_slave(struct bonding *bond)
340{
341 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
342 struct slave *rx_slave, *slave, *start_at;
343 int i = 0;
344
345 if (bond_info->next_rx_slave) {
346 start_at = bond_info->next_rx_slave;
347 } else {
348 start_at = bond->first_slave;
349 }
350
351 rx_slave = NULL;
352
353 bond_for_each_slave_from(bond, slave, i, start_at) {
354 if (SLAVE_IS_OK(slave)) {
355 if (!rx_slave) {
356 rx_slave = slave;
357 } else if (slave->speed > rx_slave->speed) {
358 rx_slave = slave;
359 }
360 }
361 }
362
363 if (rx_slave) {
364 bond_info->next_rx_slave = rx_slave->next;
365 }
366
367 return rx_slave;
368}
369
370/* teach the switch the mac of a disabled slave
371 * on the primary for fault tolerance
372 *
373 * Caller must hold bond->curr_slave_lock for write or bond lock for write
374 */
375static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
376{
377 if (!bond->curr_active_slave) {
378 return;
379 }
380
381 if (!bond->alb_info.primary_is_promisc) {
Wang Chen7e1a1ac2008-07-14 20:51:36 -0700382 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
383 bond->alb_info.primary_is_promisc = 1;
384 else
385 bond->alb_info.primary_is_promisc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 }
387
388 bond->alb_info.rlb_promisc_timeout_counter = 0;
389
390 alb_send_learning_packets(bond->curr_active_slave, addr);
391}
392
393/* slave being removed should not be active at this point
394 *
395 * Caller must hold bond lock for read
396 */
397static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
398{
399 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
400 struct rlb_client_info *rx_hash_table;
401 u32 index, next_index;
402
403 /* clear slave from rx_hashtbl */
404 _lock_rx_hashtbl(bond);
405
406 rx_hash_table = bond_info->rx_hashtbl;
407 index = bond_info->rx_hashtbl_head;
408 for (; index != RLB_NULL_INDEX; index = next_index) {
409 next_index = rx_hash_table[index].next;
410 if (rx_hash_table[index].slave == slave) {
411 struct slave *assigned_slave = rlb_next_rx_slave(bond);
412
413 if (assigned_slave) {
414 rx_hash_table[index].slave = assigned_slave;
Eric Dumazet885a1362009-09-01 06:31:18 +0000415 if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst,
416 mac_bcast)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 bond_info->rx_hashtbl[index].ntt = 1;
418 bond_info->rx_ntt = 1;
419 /* A slave has been removed from the
420 * table because it is either disabled
421 * or being released. We must retry the
422 * update to avoid clients from not
423 * being updated & disconnecting when
424 * there is stress
425 */
426 bond_info->rlb_update_retry_counter =
427 RLB_UPDATE_RETRY;
428 }
429 } else { /* there is no active slave */
430 rx_hash_table[index].slave = NULL;
431 }
432 }
433 }
434
435 _unlock_rx_hashtbl(bond);
436
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700437 write_lock_bh(&bond->curr_slave_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 if (slave != bond->curr_active_slave) {
440 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
441 }
442
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700443 write_unlock_bh(&bond->curr_slave_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444}
445
446static void rlb_update_client(struct rlb_client_info *client_info)
447{
448 int i;
449
450 if (!client_info->slave) {
451 return;
452 }
453
454 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
455 struct sk_buff *skb;
456
457 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
458 client_info->ip_dst,
459 client_info->slave->dev,
460 client_info->ip_src,
461 client_info->mac_dst,
462 client_info->slave->dev->dev_addr,
463 client_info->mac_dst);
464 if (!skb) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -0800465 pr_err("%s: Error: failed to create an ARP packet\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -0800466 client_info->slave->dev->master->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 continue;
468 }
469
470 skb->dev = client_info->slave->dev;
471
472 if (client_info->tag) {
473 skb = vlan_put_tag(skb, client_info->vlan_id);
474 if (!skb) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -0800475 pr_err("%s: Error: failed to insert VLAN tag\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -0800476 client_info->slave->dev->master->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 continue;
478 }
479 }
480
481 arp_xmit(skb);
482 }
483}
484
485/* sends ARP REPLIES that update the clients that need updating */
486static void rlb_update_rx_clients(struct bonding *bond)
487{
488 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
489 struct rlb_client_info *client_info;
490 u32 hash_index;
491
492 _lock_rx_hashtbl(bond);
493
494 hash_index = bond_info->rx_hashtbl_head;
495 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
496 client_info = &(bond_info->rx_hashtbl[hash_index]);
497 if (client_info->ntt) {
498 rlb_update_client(client_info);
499 if (bond_info->rlb_update_retry_counter == 0) {
500 client_info->ntt = 0;
501 }
502 }
503 }
504
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +0200505 /* do not update the entries again until this counter is zero so that
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 * not to confuse the clients.
507 */
508 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
509
510 _unlock_rx_hashtbl(bond);
511}
512
513/* The slave was assigned a new mac address - update the clients */
514static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
515{
516 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
517 struct rlb_client_info *client_info;
518 int ntt = 0;
519 u32 hash_index;
520
521 _lock_rx_hashtbl(bond);
522
523 hash_index = bond_info->rx_hashtbl_head;
524 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
525 client_info = &(bond_info->rx_hashtbl[hash_index]);
526
527 if ((client_info->slave == slave) &&
Eric Dumazet885a1362009-09-01 06:31:18 +0000528 compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 client_info->ntt = 1;
530 ntt = 1;
531 }
532 }
533
534 // update the team's flag only after the whole iteration
535 if (ntt) {
536 bond_info->rx_ntt = 1;
537 //fasten the change
538 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
539 }
540
541 _unlock_rx_hashtbl(bond);
542}
543
544/* mark all clients using src_ip to be updated */
Al Virod3bb52b2007-08-22 20:06:58 -0400545static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
547 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
548 struct rlb_client_info *client_info;
549 u32 hash_index;
550
551 _lock_rx_hashtbl(bond);
552
553 hash_index = bond_info->rx_hashtbl_head;
554 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
555 client_info = &(bond_info->rx_hashtbl[hash_index]);
556
557 if (!client_info->slave) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -0800558 pr_err("%s: Error: found a client with no channel in the client's hash table\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -0800559 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 continue;
561 }
562 /*update all clients using this src_ip, that are not assigned
563 * to the team's address (curr_active_slave) and have a known
564 * unicast mac address.
565 */
566 if ((client_info->ip_src == src_ip) &&
Eric Dumazet885a1362009-09-01 06:31:18 +0000567 compare_ether_addr_64bits(client_info->slave->dev->dev_addr,
568 bond->dev->dev_addr) &&
569 compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 client_info->ntt = 1;
571 bond_info->rx_ntt = 1;
572 }
573 }
574
575 _unlock_rx_hashtbl(bond);
576}
577
578/* Caller must hold both bond and ptr locks for read */
579static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
580{
581 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -0300582 struct arp_pkt *arp = arp_pkt(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 struct slave *assigned_slave;
584 struct rlb_client_info *client_info;
585 u32 hash_index = 0;
586
587 _lock_rx_hashtbl(bond);
588
Amerigo Wange364a342011-02-27 23:34:28 +0000589 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 client_info = &(bond_info->rx_hashtbl[hash_index]);
591
592 if (client_info->assigned) {
593 if ((client_info->ip_src == arp->ip_src) &&
594 (client_info->ip_dst == arp->ip_dst)) {
595 /* the entry is already assigned to this client */
Eric Dumazet885a1362009-09-01 06:31:18 +0000596 if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 /* update mac address from arp */
598 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
599 }
600
601 assigned_slave = client_info->slave;
602 if (assigned_slave) {
603 _unlock_rx_hashtbl(bond);
604 return assigned_slave;
605 }
606 } else {
607 /* the entry is already assigned to some other client,
608 * move the old client to primary (curr_active_slave) so
609 * that the new client can be assigned to this entry.
610 */
611 if (bond->curr_active_slave &&
612 client_info->slave != bond->curr_active_slave) {
613 client_info->slave = bond->curr_active_slave;
614 rlb_update_client(client_info);
615 }
616 }
617 }
618 /* assign a new slave */
619 assigned_slave = rlb_next_rx_slave(bond);
620
621 if (assigned_slave) {
622 client_info->ip_src = arp->ip_src;
623 client_info->ip_dst = arp->ip_dst;
624 /* arp->mac_dst is broadcast for arp reqeusts.
625 * will be updated with clients actual unicast mac address
626 * upon receiving an arp reply.
627 */
628 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
629 client_info->slave = assigned_slave;
630
Eric Dumazet885a1362009-09-01 06:31:18 +0000631 if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 client_info->ntt = 1;
633 bond->alb_info.rx_ntt = 1;
634 } else {
635 client_info->ntt = 0;
636 }
637
Jiri Pirkocc0e4072011-07-20 04:54:46 +0000638 if (bond_vlan_used(bond)) {
Jay Vosburgh966bc6f2008-03-21 22:29:34 -0700639 if (!vlan_get_tag(skb, &client_info->vlan_id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 client_info->tag = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 }
642
643 if (!client_info->assigned) {
644 u32 prev_tbl_head = bond_info->rx_hashtbl_head;
645 bond_info->rx_hashtbl_head = hash_index;
646 client_info->next = prev_tbl_head;
647 if (prev_tbl_head != RLB_NULL_INDEX) {
648 bond_info->rx_hashtbl[prev_tbl_head].prev =
649 hash_index;
650 }
651 client_info->assigned = 1;
652 }
653 }
654
655 _unlock_rx_hashtbl(bond);
656
657 return assigned_slave;
658}
659
660/* chooses (and returns) transmit channel for arp reply
661 * does not choose channel for other arp types since they are
662 * sent on the curr_active_slave
663 */
664static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
665{
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -0300666 struct arp_pkt *arp = arp_pkt(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 struct slave *tx_slave = NULL;
668
Brian Haleyf14c4e42008-09-02 10:08:08 -0400669 if (arp->op_code == htons(ARPOP_REPLY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 /* the arp must be sent on the selected
671 * rx channel
672 */
673 tx_slave = rlb_choose_channel(skb, bond);
674 if (tx_slave) {
675 memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
676 }
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800677 pr_debug("Server sent ARP Reply packet\n");
Brian Haleyf14c4e42008-09-02 10:08:08 -0400678 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 /* Create an entry in the rx_hashtbl for this client as a
680 * place holder.
681 * When the arp reply is received the entry will be updated
682 * with the correct unicast address of the client.
683 */
684 rlb_choose_channel(skb, bond);
685
Peter Pan(潘卫平)77c8e2c2011-04-11 00:16:32 +0000686 /* The ARP reply packets must be delayed so that
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 * they can cancel out the influence of the ARP request.
688 */
689 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
690
691 /* arp requests are broadcast and are sent on the primary
692 * the arp request will collapse all clients on the subnet to
693 * the primary slave. We must register these clients to be
694 * updated with their assigned mac.
695 */
696 rlb_req_update_subnet_clients(bond, arp->ip_src);
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800697 pr_debug("Server sent ARP Request packet\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 }
699
700 return tx_slave;
701}
702
703/* Caller must hold bond lock for read */
704static void rlb_rebalance(struct bonding *bond)
705{
706 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
707 struct slave *assigned_slave;
708 struct rlb_client_info *client_info;
709 int ntt;
710 u32 hash_index;
711
712 _lock_rx_hashtbl(bond);
713
714 ntt = 0;
715 hash_index = bond_info->rx_hashtbl_head;
716 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
717 client_info = &(bond_info->rx_hashtbl[hash_index]);
718 assigned_slave = rlb_next_rx_slave(bond);
719 if (assigned_slave && (client_info->slave != assigned_slave)) {
720 client_info->slave = assigned_slave;
721 client_info->ntt = 1;
722 ntt = 1;
723 }
724 }
725
726 /* update the team's flag only after the whole iteration */
727 if (ntt) {
728 bond_info->rx_ntt = 1;
729 }
730 _unlock_rx_hashtbl(bond);
731}
732
733/* Caller must hold rx_hashtbl lock */
734static void rlb_init_table_entry(struct rlb_client_info *entry)
735{
736 memset(entry, 0, sizeof(struct rlb_client_info));
737 entry->next = RLB_NULL_INDEX;
738 entry->prev = RLB_NULL_INDEX;
739}
740
741static int rlb_initialize(struct bonding *bond)
742{
743 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
Mitch Williams0d206a32005-11-09 10:35:30 -0800744 struct rlb_client_info *new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
746 int i;
747
Mitch Williams0d206a32005-11-09 10:35:30 -0800748 new_hashtbl = kmalloc(size, GFP_KERNEL);
749 if (!new_hashtbl) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -0800750 pr_err("%s: Error: Failed to allocate RLB hash table\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 return -1;
753 }
Mitch Williams0d206a32005-11-09 10:35:30 -0800754 _lock_rx_hashtbl(bond);
755
756 bond_info->rx_hashtbl = new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
759
760 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
761 rlb_init_table_entry(bond_info->rx_hashtbl + i);
762 }
763
764 _unlock_rx_hashtbl(bond);
765
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 /* register to receive ARPs */
Jiri Pirko3aba8912011-04-19 03:48:16 +0000767 bond->recv_probe = rlb_arp_recv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
769 return 0;
770}
771
772static void rlb_deinitialize(struct bonding *bond)
773{
774 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 _lock_rx_hashtbl(bond);
777
778 kfree(bond_info->rx_hashtbl);
779 bond_info->rx_hashtbl = NULL;
780 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
781
782 _unlock_rx_hashtbl(bond);
783}
784
785static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
786{
787 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
788 u32 curr_index;
789
790 _lock_rx_hashtbl(bond);
791
792 curr_index = bond_info->rx_hashtbl_head;
793 while (curr_index != RLB_NULL_INDEX) {
794 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
795 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
796 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
797
798 if (curr->tag && (curr->vlan_id == vlan_id)) {
799 if (curr_index == bond_info->rx_hashtbl_head) {
800 bond_info->rx_hashtbl_head = next_index;
801 }
802 if (prev_index != RLB_NULL_INDEX) {
803 bond_info->rx_hashtbl[prev_index].next = next_index;
804 }
805 if (next_index != RLB_NULL_INDEX) {
806 bond_info->rx_hashtbl[next_index].prev = prev_index;
807 }
808
809 rlb_init_table_entry(curr);
810 }
811
812 curr_index = next_index;
813 }
814
815 _unlock_rx_hashtbl(bond);
816}
817
818/*********************** tlb/rlb shared functions *********************/
819
820static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
821{
822 struct bonding *bond = bond_get_bond_by_slave(slave);
823 struct learning_pkt pkt;
824 int size = sizeof(struct learning_pkt);
825 int i;
826
827 memset(&pkt, 0, size);
828 memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
829 memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
Harvey Harrison09640e62009-02-01 00:45:17 -0800830 pkt.type = cpu_to_be16(ETH_P_LOOP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 for (i = 0; i < MAX_LP_BURST; i++) {
833 struct sk_buff *skb;
834 char *data;
835
836 skb = dev_alloc_skb(size);
837 if (!skb) {
838 return;
839 }
840
841 data = skb_put(skb, size);
842 memcpy(data, &pkt, size);
843
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700844 skb_reset_mac_header(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700845 skb->network_header = skb->mac_header + ETH_HLEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 skb->protocol = pkt.type;
847 skb->priority = TC_PRIO_CONTROL;
848 skb->dev = slave->dev;
849
Jiri Pirkocc0e4072011-07-20 04:54:46 +0000850 if (bond_vlan_used(bond)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 struct vlan_entry *vlan;
852
853 vlan = bond_next_vlan(bond,
854 bond->alb_info.current_alb_vlan);
855
856 bond->alb_info.current_alb_vlan = vlan;
857 if (!vlan) {
858 kfree_skb(skb);
859 continue;
860 }
861
862 skb = vlan_put_tag(skb, vlan->vlan_id);
863 if (!skb) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -0800864 pr_err("%s: Error: failed to insert VLAN tag\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -0800865 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 continue;
867 }
868 }
869
870 dev_queue_xmit(skb);
871 }
872}
873
874/* hw is a boolean parameter that determines whether we should try and
875 * set the hw address of the device as well as the hw address of the
876 * net_device
877 */
878static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
879{
880 struct net_device *dev = slave->dev;
881 struct sockaddr s_addr;
882
883 if (!hw) {
884 memcpy(dev->dev_addr, addr, dev->addr_len);
885 return 0;
886 }
887
888 /* for rlb each slave must have a unique hw mac addresses so that */
889 /* each slave will receive packets destined to a different mac */
890 memcpy(s_addr.sa_data, addr, dev->addr_len);
891 s_addr.sa_family = dev->type;
892 if (dev_set_mac_address(dev, &s_addr)) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -0800893 pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
894 "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -0800895 dev->master->name, dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 return -EOPNOTSUPP;
897 }
898 return 0;
899}
900
Jay Vosburgh059fe7a2007-10-17 17:37:49 -0700901/*
902 * Swap MAC addresses between two slaves.
903 *
904 * Called with RTNL held, and no other locks.
905 *
906 */
907
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
909{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 u8 tmp_mac_addr[ETH_ALEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
912 memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
913 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
914 alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
915
Jay Vosburgh059fe7a2007-10-17 17:37:49 -0700916}
917
918/*
919 * Send learning packets after MAC address swap.
920 *
Jay Vosburgh25433312008-01-17 16:24:59 -0800921 * Called with RTNL and no other locks
Jay Vosburgh059fe7a2007-10-17 17:37:49 -0700922 */
923static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
924 struct slave *slave2)
925{
926 int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
927 struct slave *disabled_slave = NULL;
928
Jay Vosburgh25433312008-01-17 16:24:59 -0800929 ASSERT_RTNL();
930
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 /* fasten the change in the switch */
932 if (SLAVE_IS_OK(slave1)) {
933 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
934 if (bond->alb_info.rlb_enabled) {
935 /* inform the clients that the mac address
936 * has changed
937 */
938 rlb_req_update_slave_clients(bond, slave1);
939 }
940 } else {
941 disabled_slave = slave1;
942 }
943
944 if (SLAVE_IS_OK(slave2)) {
945 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
946 if (bond->alb_info.rlb_enabled) {
947 /* inform the clients that the mac address
948 * has changed
949 */
950 rlb_req_update_slave_clients(bond, slave2);
951 }
952 } else {
953 disabled_slave = slave2;
954 }
955
956 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
957 /* A disabled slave was assigned an active mac addr */
958 rlb_teach_disabled_mac_on_primary(bond,
959 disabled_slave->dev->dev_addr);
960 }
961}
962
963/**
964 * alb_change_hw_addr_on_detach
965 * @bond: bonding we're working on
966 * @slave: the slave that was just detached
967 *
968 * We assume that @slave was already detached from the slave list.
969 *
970 * If @slave's permanent hw address is different both from its current
971 * address and from @bond's address, then somewhere in the bond there's
972 * a slave that has @slave's permanet address as its current address.
973 * We'll make sure that that slave no longer uses @slave's permanent address.
974 *
Jay Vosburgh25433312008-01-17 16:24:59 -0800975 * Caller must hold RTNL and no other locks
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 */
977static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
978{
979 int perm_curr_diff;
980 int perm_bond_diff;
981
Eric Dumazet885a1362009-09-01 06:31:18 +0000982 perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
983 slave->dev->dev_addr);
984 perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
985 bond->dev->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986
987 if (perm_curr_diff && perm_bond_diff) {
988 struct slave *tmp_slave;
989 int i, found = 0;
990
991 bond_for_each_slave(bond, tmp_slave, i) {
Eric Dumazet885a1362009-09-01 06:31:18 +0000992 if (!compare_ether_addr_64bits(slave->perm_hwaddr,
993 tmp_slave->dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 found = 1;
995 break;
996 }
997 }
998
999 if (found) {
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001000 /* locking: needs RTNL and nothing else */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 alb_swap_mac_addr(bond, slave, tmp_slave);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001002 alb_fasten_mac_swap(bond, slave, tmp_slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 }
1004 }
1005}
1006
1007/**
1008 * alb_handle_addr_collision_on_attach
1009 * @bond: bonding we're working on
1010 * @slave: the slave that was just attached
1011 *
1012 * checks uniqueness of slave's mac address and handles the case the
1013 * new slave uses the bonds mac address.
1014 *
1015 * If the permanent hw address of @slave is @bond's hw address, we need to
1016 * find a different hw address to give @slave, that isn't in use by any other
Peter Pan(潘卫平)77c8e2c2011-04-11 00:16:32 +00001017 * slave in the bond. This address must be, of course, one of the permanent
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 * addresses of the other slaves.
1019 *
1020 * We go over the slave list, and for each slave there we compare its
1021 * permanent hw address with the current address of all the other slaves.
1022 * If no match was found, then we've found a slave with a permanent address
1023 * that isn't used by any other slave in the bond, so we can assign it to
1024 * @slave.
1025 *
1026 * assumption: this function is called before @slave is attached to the
1027 * bond slave list.
1028 *
1029 * caller must hold the bond lock for write since the mac addresses are compared
1030 * and may be swapped.
1031 */
1032static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1033{
1034 struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1035 struct slave *has_bond_addr = bond->curr_active_slave;
1036 int i, j, found = 0;
1037
1038 if (bond->slave_cnt == 0) {
1039 /* this is the first slave */
1040 return 0;
1041 }
1042
1043 /* if slave's mac address differs from bond's mac address
1044 * check uniqueness of slave's mac address against the other
1045 * slaves in the bond.
1046 */
Eric Dumazet885a1362009-09-01 06:31:18 +00001047 if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 bond_for_each_slave(bond, tmp_slave1, i) {
Eric Dumazet885a1362009-09-01 06:31:18 +00001049 if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1050 slave->dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 found = 1;
1052 break;
1053 }
1054 }
1055
John W. Linville6b38aef2005-07-28 15:00:15 -04001056 if (!found)
1057 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058
John W. Linville6b38aef2005-07-28 15:00:15 -04001059 /* Try setting slave mac to bond address and fall-through
1060 to code handling that situation below... */
1061 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1062 bond->alb_info.rlb_enabled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 }
1064
1065 /* The slave's address is equal to the address of the bond.
1066 * Search for a spare address in the bond for this slave.
1067 */
1068 free_mac_slave = NULL;
1069
1070 bond_for_each_slave(bond, tmp_slave1, i) {
1071 found = 0;
1072 bond_for_each_slave(bond, tmp_slave2, j) {
Eric Dumazet885a1362009-09-01 06:31:18 +00001073 if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr,
1074 tmp_slave2->dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 found = 1;
1076 break;
1077 }
1078 }
1079
1080 if (!found) {
1081 /* no slave has tmp_slave1's perm addr
1082 * as its curr addr
1083 */
1084 free_mac_slave = tmp_slave1;
1085 break;
1086 }
1087
1088 if (!has_bond_addr) {
Eric Dumazet885a1362009-09-01 06:31:18 +00001089 if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1090 bond->dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
1092 has_bond_addr = tmp_slave1;
1093 }
1094 }
1095 }
1096
1097 if (free_mac_slave) {
1098 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1099 bond->alb_info.rlb_enabled);
1100
Joe Perchesa4aee5c2009-12-13 20:06:07 -08001101 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
Jiri Pirkoe5e2a8f2009-08-13 04:11:52 +00001102 bond->dev->name, slave->dev->name,
1103 free_mac_slave->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104
1105 } else if (has_bond_addr) {
Joe Perchesa4aee5c2009-12-13 20:06:07 -08001106 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",
Mitch Williams4e0952c2005-11-09 10:34:57 -08001107 bond->dev->name, slave->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 return -EFAULT;
1109 }
1110
1111 return 0;
1112}
1113
1114/**
1115 * alb_set_mac_address
1116 * @bond:
1117 * @addr:
1118 *
1119 * In TLB mode all slaves are configured to the bond's hw address, but set
1120 * their dev_addr field to different addresses (based on their permanent hw
1121 * addresses).
1122 *
1123 * For each slave, this function sets the interface to the new address and then
1124 * changes its dev_addr field to its previous value.
1125 *
1126 * Unwinding assumes bond's mac address has not yet changed.
1127 */
1128static int alb_set_mac_address(struct bonding *bond, void *addr)
1129{
1130 struct sockaddr sa;
1131 struct slave *slave, *stop_at;
1132 char tmp_addr[ETH_ALEN];
1133 int res;
1134 int i;
1135
1136 if (bond->alb_info.rlb_enabled) {
1137 return 0;
1138 }
1139
1140 bond_for_each_slave(bond, slave, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 /* save net_device's current hw address */
1142 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1143
1144 res = dev_set_mac_address(slave->dev, addr);
1145
1146 /* restore net_device's hw address */
1147 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1148
Stephen Hemmingereb7cc592008-11-19 21:56:05 -08001149 if (res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 goto unwind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 }
1152
1153 return 0;
1154
1155unwind:
1156 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1157 sa.sa_family = bond->dev->type;
1158
1159 /* unwind from head to the slave that failed */
1160 stop_at = slave;
1161 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1162 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1163 dev_set_mac_address(slave->dev, &sa);
1164 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1165 }
1166
1167 return res;
1168}
1169
1170/************************ exported alb funcions ************************/
1171
1172int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1173{
1174 int res;
1175
1176 res = tlb_initialize(bond);
1177 if (res) {
1178 return res;
1179 }
1180
1181 if (rlb_enabled) {
1182 bond->alb_info.rlb_enabled = 1;
1183 /* initialize rlb */
1184 res = rlb_initialize(bond);
1185 if (res) {
1186 tlb_deinitialize(bond);
1187 return res;
1188 }
Mitch Williamsb76850a2005-11-09 10:35:35 -08001189 } else {
1190 bond->alb_info.rlb_enabled = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 }
1192
1193 return 0;
1194}
1195
1196void bond_alb_deinitialize(struct bonding *bond)
1197{
1198 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1199
1200 tlb_deinitialize(bond);
1201
1202 if (bond_info->rlb_enabled) {
1203 rlb_deinitialize(bond);
1204 }
1205}
1206
1207int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1208{
Wang Chen454d7c92008-11-12 23:37:49 -08001209 struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 struct ethhdr *eth_data;
1211 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1212 struct slave *tx_slave = NULL;
Al Virod3bb52b2007-08-22 20:06:58 -04001213 static const __be32 ip_bcast = htonl(0xffffffff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 int hash_size = 0;
1215 int do_tx_balance = 1;
1216 u32 hash_index = 0;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001217 const u8 *hash_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 int res = 1;
Vlad Yasevich2d1ea192008-08-28 15:38:41 -04001219 struct ipv6hdr *ip6hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001221 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 eth_data = eth_hdr(skb);
1223
Michał Mirosław0693e882011-05-07 01:48:02 +00001224 /* make sure that the curr_active_slave do not change during tx
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 read_lock(&bond->curr_slave_lock);
1227
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 switch (ntohs(skb->protocol)) {
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001229 case ETH_P_IP: {
1230 const struct iphdr *iph = ip_hdr(skb);
1231
Eric Dumazet885a1362009-09-01 06:31:18 +00001232 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) ||
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001233 (iph->daddr == ip_bcast) ||
1234 (iph->protocol == IPPROTO_IGMP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 do_tx_balance = 0;
1236 break;
1237 }
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001238 hash_start = (char *)&(iph->daddr);
1239 hash_size = sizeof(iph->daddr);
1240 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 break;
1242 case ETH_P_IPV6:
Vlad Yasevich2d1ea192008-08-28 15:38:41 -04001243 /* IPv6 doesn't really use broadcast mac address, but leave
1244 * that here just in case.
1245 */
Eric Dumazet885a1362009-09-01 06:31:18 +00001246 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 do_tx_balance = 0;
1248 break;
1249 }
1250
Vlad Yasevich2d1ea192008-08-28 15:38:41 -04001251 /* IPv6 uses all-nodes multicast as an equivalent to
1252 * broadcasts in IPv4.
1253 */
Eric Dumazet885a1362009-09-01 06:31:18 +00001254 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) {
Vlad Yasevich2d1ea192008-08-28 15:38:41 -04001255 do_tx_balance = 0;
1256 break;
1257 }
1258
1259 /* Additianally, DAD probes should not be tx-balanced as that
1260 * will lead to false positives for duplicate addresses and
1261 * prevent address configuration from working.
1262 */
1263 ip6hdr = ipv6_hdr(skb);
1264 if (ipv6_addr_any(&ip6hdr->saddr)) {
1265 do_tx_balance = 0;
1266 break;
1267 }
1268
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001269 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1270 hash_size = sizeof(ipv6_hdr(skb)->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 break;
1272 case ETH_P_IPX:
Al Virod3bb52b2007-08-22 20:06:58 -04001273 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 /* something is wrong with this packet */
1275 do_tx_balance = 0;
1276 break;
1277 }
1278
1279 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1280 /* The only protocol worth balancing in
1281 * this family since it has an "ARP" like
1282 * mechanism
1283 */
1284 do_tx_balance = 0;
1285 break;
1286 }
1287
1288 hash_start = (char*)eth_data->h_dest;
1289 hash_size = ETH_ALEN;
1290 break;
1291 case ETH_P_ARP:
1292 do_tx_balance = 0;
1293 if (bond_info->rlb_enabled) {
1294 tx_slave = rlb_arp_xmit(skb, bond);
1295 }
1296 break;
1297 default:
1298 do_tx_balance = 0;
1299 break;
1300 }
1301
1302 if (do_tx_balance) {
1303 hash_index = _simple_hash(hash_start, hash_size);
1304 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1305 }
1306
1307 if (!tx_slave) {
1308 /* unbalanced or unassigned, send through primary */
1309 tx_slave = bond->curr_active_slave;
1310 bond_info->unbalanced_load += skb->len;
1311 }
1312
1313 if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1314 if (tx_slave != bond->curr_active_slave) {
1315 memcpy(eth_data->h_source,
1316 tx_slave->dev->dev_addr,
1317 ETH_ALEN);
1318 }
1319
1320 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1321 } else {
1322 if (tx_slave) {
1323 tlb_clear_slave(bond, tx_slave, 0);
1324 }
1325 }
1326
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 if (res) {
1328 /* no suitable interface, frame not sent */
1329 dev_kfree_skb(skb);
1330 }
1331 read_unlock(&bond->curr_slave_lock);
Michał Mirosław0693e882011-05-07 01:48:02 +00001332
Patrick McHardyec634fe2009-07-05 19:23:38 -07001333 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334}
1335
Jay Vosburgh1b76b312007-10-17 17:37:45 -07001336void bond_alb_monitor(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337{
Jay Vosburgh1b76b312007-10-17 17:37:45 -07001338 struct bonding *bond = container_of(work, struct bonding,
1339 alb_work.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1341 struct slave *slave;
1342 int i;
1343
1344 read_lock(&bond->lock);
1345
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 if (bond->slave_cnt == 0) {
1347 bond_info->tx_rebalance_counter = 0;
1348 bond_info->lp_counter = 0;
1349 goto re_arm;
1350 }
1351
1352 bond_info->tx_rebalance_counter++;
1353 bond_info->lp_counter++;
1354
1355 /* send learning packets */
1356 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1357 /* change of curr_active_slave involves swapping of mac addresses.
1358 * in order to avoid this swapping from happening while
1359 * sending the learning packets, the curr_slave_lock must be held for
1360 * read.
1361 */
1362 read_lock(&bond->curr_slave_lock);
1363
1364 bond_for_each_slave(bond, slave, i) {
Mitch Williamse944ef72005-11-09 10:36:50 -08001365 alb_send_learning_packets(slave, slave->dev->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 }
1367
1368 read_unlock(&bond->curr_slave_lock);
1369
1370 bond_info->lp_counter = 0;
1371 }
1372
1373 /* rebalance tx traffic */
1374 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1375
1376 read_lock(&bond->curr_slave_lock);
1377
1378 bond_for_each_slave(bond, slave, i) {
1379 tlb_clear_slave(bond, slave, 1);
1380 if (slave == bond->curr_active_slave) {
1381 SLAVE_TLB_INFO(slave).load =
1382 bond_info->unbalanced_load /
1383 BOND_TLB_REBALANCE_INTERVAL;
1384 bond_info->unbalanced_load = 0;
1385 }
1386 }
1387
1388 read_unlock(&bond->curr_slave_lock);
1389
1390 bond_info->tx_rebalance_counter = 0;
1391 }
1392
1393 /* handle rlb stuff */
1394 if (bond_info->rlb_enabled) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 if (bond_info->primary_is_promisc &&
1396 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1397
Jay Vosburghd0e81b72007-10-17 17:37:51 -07001398 /*
1399 * dev_set_promiscuity requires rtnl and
Jay Vosburghe6d265e2011-10-28 15:42:50 +00001400 * nothing else. Avoid race with bond_close.
Jay Vosburghd0e81b72007-10-17 17:37:51 -07001401 */
1402 read_unlock(&bond->lock);
Jay Vosburghe6d265e2011-10-28 15:42:50 +00001403 if (!rtnl_trylock()) {
1404 read_lock(&bond->lock);
1405 goto re_arm;
1406 }
Jay Vosburghd0e81b72007-10-17 17:37:51 -07001407
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 bond_info->rlb_promisc_timeout_counter = 0;
1409
1410 /* If the primary was set to promiscuous mode
1411 * because a slave was disabled then
1412 * it can now leave promiscuous mode.
1413 */
1414 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1415 bond_info->primary_is_promisc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
Jay Vosburghd0e81b72007-10-17 17:37:51 -07001417 rtnl_unlock();
1418 read_lock(&bond->lock);
1419 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420
1421 if (bond_info->rlb_rebalance) {
1422 bond_info->rlb_rebalance = 0;
1423 rlb_rebalance(bond);
1424 }
1425
1426 /* check if clients need updating */
1427 if (bond_info->rx_ntt) {
1428 if (bond_info->rlb_update_delay_counter) {
1429 --bond_info->rlb_update_delay_counter;
1430 } else {
1431 rlb_update_rx_clients(bond);
1432 if (bond_info->rlb_update_retry_counter) {
1433 --bond_info->rlb_update_retry_counter;
1434 } else {
1435 bond_info->rx_ntt = 0;
1436 }
1437 }
1438 }
1439 }
1440
1441re_arm:
Jay Vosburghe6d265e2011-10-28 15:42:50 +00001442 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1443
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 read_unlock(&bond->lock);
1445}
1446
1447/* assumption: called before the slave is attached to the bond
1448 * and not locked by the bond lock
1449 */
1450int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1451{
1452 int res;
1453
1454 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1455 bond->alb_info.rlb_enabled);
1456 if (res) {
1457 return res;
1458 }
1459
1460 /* caller must hold the bond lock for write since the mac addresses
1461 * are compared and may be swapped.
1462 */
Jay Vosburgh6603a6f2007-10-17 17:37:50 -07001463 read_lock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
1465 res = alb_handle_addr_collision_on_attach(bond, slave);
1466
Jay Vosburgh6603a6f2007-10-17 17:37:50 -07001467 read_unlock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468
1469 if (res) {
1470 return res;
1471 }
1472
1473 tlb_init_slave(slave);
1474
1475 /* order a rebalance ASAP */
1476 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1477
1478 if (bond->alb_info.rlb_enabled) {
1479 bond->alb_info.rlb_rebalance = 1;
1480 }
1481
1482 return 0;
1483}
1484
Jay Vosburgh25433312008-01-17 16:24:59 -08001485/*
1486 * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1487 * if necessary.
1488 *
1489 * Caller must hold RTNL and no other locks
1490 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1492{
1493 if (bond->slave_cnt > 1) {
1494 alb_change_hw_addr_on_detach(bond, slave);
1495 }
1496
1497 tlb_clear_slave(bond, slave, 0);
1498
1499 if (bond->alb_info.rlb_enabled) {
1500 bond->alb_info.next_rx_slave = NULL;
1501 rlb_clear_slave(bond, slave);
1502 }
1503}
1504
1505/* Caller must hold bond lock for read */
1506void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1507{
1508 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1509
1510 if (link == BOND_LINK_DOWN) {
1511 tlb_clear_slave(bond, slave, 0);
1512 if (bond->alb_info.rlb_enabled) {
1513 rlb_clear_slave(bond, slave);
1514 }
1515 } else if (link == BOND_LINK_UP) {
1516 /* order a rebalance ASAP */
1517 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1518 if (bond->alb_info.rlb_enabled) {
1519 bond->alb_info.rlb_rebalance = 1;
1520 /* If the updelay module parameter is smaller than the
1521 * forwarding delay of the switch the rebalance will
1522 * not work because the rebalance arp replies will
1523 * not be forwarded to the clients..
1524 */
1525 }
1526 }
1527}
1528
1529/**
1530 * bond_alb_handle_active_change - assign new curr_active_slave
1531 * @bond: our bonding struct
1532 * @new_slave: new slave to assign
1533 *
1534 * Set the bond->curr_active_slave to @new_slave and handle
1535 * mac address swapping and promiscuity changes as needed.
1536 *
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001537 * If new_slave is NULL, caller must hold curr_slave_lock or
1538 * bond->lock for write.
1539 *
1540 * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1541 * read and curr_slave_lock for write. Processing here may sleep, so
1542 * no other locks may be held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 */
1544void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
Hannes Eder1f78d9f2009-02-14 11:15:33 +00001545 __releases(&bond->curr_slave_lock)
1546 __releases(&bond->lock)
1547 __acquires(&bond->lock)
1548 __acquires(&bond->curr_slave_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549{
1550 struct slave *swap_slave;
1551 int i;
1552
1553 if (bond->curr_active_slave == new_slave) {
1554 return;
1555 }
1556
1557 if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1558 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1559 bond->alb_info.primary_is_promisc = 0;
1560 bond->alb_info.rlb_promisc_timeout_counter = 0;
1561 }
1562
1563 swap_slave = bond->curr_active_slave;
1564 bond->curr_active_slave = new_slave;
1565
1566 if (!new_slave || (bond->slave_cnt == 0)) {
1567 return;
1568 }
1569
1570 /* set the new curr_active_slave to the bonds mac address
1571 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1572 */
1573 if (!swap_slave) {
1574 struct slave *tmp_slave;
1575 /* find slave that is holding the bond's mac address */
1576 bond_for_each_slave(bond, tmp_slave, i) {
Eric Dumazet885a1362009-09-01 06:31:18 +00001577 if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr,
1578 bond->dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 swap_slave = tmp_slave;
1580 break;
1581 }
1582 }
1583 }
1584
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001585 /*
1586 * Arrange for swap_slave and new_slave to temporarily be
1587 * ignored so we can mess with their MAC addresses without
1588 * fear of interference from transmit activity.
1589 */
1590 if (swap_slave) {
1591 tlb_clear_slave(bond, swap_slave, 1);
1592 }
1593 tlb_clear_slave(bond, new_slave, 1);
1594
1595 write_unlock_bh(&bond->curr_slave_lock);
1596 read_unlock(&bond->lock);
1597
Jay Vosburghe0138a62008-01-17 16:24:58 -08001598 ASSERT_RTNL();
1599
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1601 if (swap_slave) {
1602 /* swap mac address */
1603 alb_swap_mac_addr(bond, swap_slave, new_slave);
1604 } else {
1605 /* set the new_slave to the bond mac address */
1606 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1607 bond->alb_info.rlb_enabled);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001608 }
1609
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001610 if (swap_slave) {
1611 alb_fasten_mac_swap(bond, swap_slave, new_slave);
Jay Vosburgh25433312008-01-17 16:24:59 -08001612 read_lock(&bond->lock);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001613 } else {
Jay Vosburgh25433312008-01-17 16:24:59 -08001614 read_lock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1616 }
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001617
1618 write_lock_bh(&bond->curr_slave_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619}
1620
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001621/*
1622 * Called with RTNL
1623 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
Hannes Eder1f78d9f2009-02-14 11:15:33 +00001625 __acquires(&bond->lock)
Jay Vosburgh815bcc22009-05-04 09:03:37 +00001626 __releases(&bond->lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627{
Wang Chen454d7c92008-11-12 23:37:49 -08001628 struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 struct sockaddr *sa = addr;
1630 struct slave *slave, *swap_slave;
1631 int res;
1632 int i;
1633
1634 if (!is_valid_ether_addr(sa->sa_data)) {
1635 return -EADDRNOTAVAIL;
1636 }
1637
1638 res = alb_set_mac_address(bond, addr);
1639 if (res) {
1640 return res;
1641 }
1642
1643 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1644
1645 /* If there is no curr_active_slave there is nothing else to do.
1646 * Otherwise we'll need to pass the new address to it and handle
1647 * duplications.
1648 */
1649 if (!bond->curr_active_slave) {
1650 return 0;
1651 }
1652
1653 swap_slave = NULL;
1654
1655 bond_for_each_slave(bond, slave, i) {
Eric Dumazet885a1362009-09-01 06:31:18 +00001656 if (!compare_ether_addr_64bits(slave->dev->dev_addr,
1657 bond_dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 swap_slave = slave;
1659 break;
1660 }
1661 }
1662
1663 if (swap_slave) {
1664 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001665 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 } else {
1667 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
1668 bond->alb_info.rlb_enabled);
1669
Jay Vosburgh815bcc22009-05-04 09:03:37 +00001670 read_lock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1672 if (bond->alb_info.rlb_enabled) {
1673 /* inform clients mac address has changed */
1674 rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1675 }
Jay Vosburgh815bcc22009-05-04 09:03:37 +00001676 read_unlock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 }
1678
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 return 0;
1680}
1681
1682void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1683{
1684 if (bond->alb_info.current_alb_vlan &&
1685 (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1686 bond->alb_info.current_alb_vlan = NULL;
1687 }
1688
1689 if (bond->alb_info.rlb_enabled) {
1690 rlb_clear_vlan(bond, vlan_id);
1691 }
1692}
1693