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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/skbuff.h>
24#include <linux/netdevice.h>
25#include <linux/etherdevice.h>
26#include <linux/pkt_sched.h>
27#include <linux/spinlock.h>
28#include <linux/slab.h>
29#include <linux/timer.h>
30#include <linux/ip.h>
31#include <linux/ipv6.h>
32#include <linux/if_arp.h>
33#include <linux/if_ether.h>
34#include <linux/if_bonding.h>
35#include <linux/if_vlan.h>
36#include <linux/in.h>
37#include <net/ipx.h>
38#include <net/arp.h>
Vlad Yasevich2d1ea192008-08-28 15:38:41 -040039#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <asm/byteorder.h>
41#include "bonding.h"
42#include "bond_alb.h"
43
44
45#define ALB_TIMER_TICKS_PER_SEC 10 /* should be a divisor of HZ */
46#define BOND_TLB_REBALANCE_INTERVAL 10 /* In seconds, periodic re-balancing.
47 * Used for division - never set
48 * to zero !!!
49 */
50#define BOND_ALB_LP_INTERVAL 1 /* In seconds, periodic send of
51 * learning packets to the switch
52 */
53
54#define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \
55 * ALB_TIMER_TICKS_PER_SEC)
56
57#define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \
58 * ALB_TIMER_TICKS_PER_SEC)
59
60#define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table.
61 * Note that this value MUST NOT be smaller
62 * because the key hash table is BYTE wide !
63 */
64
65
66#define TLB_NULL_INDEX 0xffffffff
67#define MAX_LP_BURST 3
68
69/* rlb defs */
70#define RLB_HASH_TABLE_SIZE 256
71#define RLB_NULL_INDEX 0xffffffff
72#define RLB_UPDATE_DELAY 2*ALB_TIMER_TICKS_PER_SEC /* 2 seconds */
73#define RLB_ARP_BURST_SIZE 2
74#define RLB_UPDATE_RETRY 3 /* 3-ticks - must be smaller than the rlb
75 * rebalance interval (5 min).
76 */
77/* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is
78 * promiscuous after failover
79 */
80#define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC
81
82static const u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
Vlad Yasevich2d1ea192008-08-28 15:38:41 -040083static const u8 mac_v6_allmcast[ETH_ALEN] = {0x33,0x33,0x00,0x00,0x00,0x01};
Linus Torvalds1da177e2005-04-16 15:20:36 -070084static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
85
86#pragma pack(1)
87struct learning_pkt {
88 u8 mac_dst[ETH_ALEN];
89 u8 mac_src[ETH_ALEN];
Al Virod3bb52b2007-08-22 20:06:58 -040090 __be16 type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 u8 padding[ETH_ZLEN - ETH_HLEN];
92};
93
94struct arp_pkt {
Al Virod3bb52b2007-08-22 20:06:58 -040095 __be16 hw_addr_space;
96 __be16 prot_addr_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 u8 hw_addr_len;
98 u8 prot_addr_len;
Al Virod3bb52b2007-08-22 20:06:58 -040099 __be16 op_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 u8 mac_src[ETH_ALEN]; /* sender hardware address */
Al Virod3bb52b2007-08-22 20:06:58 -0400101 __be32 ip_src; /* sender IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 u8 mac_dst[ETH_ALEN]; /* target hardware address */
Al Virod3bb52b2007-08-22 20:06:58 -0400103 __be32 ip_dst; /* target IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104};
105#pragma pack()
106
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -0300107static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
108{
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700109 return (struct arp_pkt *)skb_network_header(skb);
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -0300110}
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112/* Forward declaration */
113static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
114
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700115static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
117 int i;
118 u8 hash = 0;
119
120 for (i = 0; i < hash_size; i++) {
121 hash ^= hash_start[i];
122 }
123
124 return hash;
125}
126
127/*********************** tlb specific functions ***************************/
128
129static inline void _lock_tx_hashtbl(struct bonding *bond)
130{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700131 spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
134static inline void _unlock_tx_hashtbl(struct bonding *bond)
135{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700136 spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
139/* Caller must hold tx_hashtbl lock */
140static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
141{
142 if (save_load) {
143 entry->load_history = 1 + entry->tx_bytes /
144 BOND_TLB_REBALANCE_INTERVAL;
145 entry->tx_bytes = 0;
146 }
147
148 entry->tx_slave = NULL;
149 entry->next = TLB_NULL_INDEX;
150 entry->prev = TLB_NULL_INDEX;
151}
152
153static inline void tlb_init_slave(struct slave *slave)
154{
155 SLAVE_TLB_INFO(slave).load = 0;
156 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
157}
158
159/* Caller must hold bond lock for read */
160static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
161{
162 struct tlb_client_info *tx_hash_table;
163 u32 index;
164
165 _lock_tx_hashtbl(bond);
166
167 /* clear slave from tx_hashtbl */
168 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
169
Andy Gospodarekce39a802008-10-30 17:41:16 -0700170 /* skip this if we've already freed the tx hash table */
171 if (tx_hash_table) {
172 index = SLAVE_TLB_INFO(slave).head;
173 while (index != TLB_NULL_INDEX) {
174 u32 next_index = tx_hash_table[index].next;
175 tlb_init_table_entry(&tx_hash_table[index], save_load);
176 index = next_index;
177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 tlb_init_slave(slave);
Jay Vosburgh5af47b22006-01-09 12:14:00 -0800181
182 _unlock_tx_hashtbl(bond);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
185/* Must be called before starting the monitor timer */
186static int tlb_initialize(struct bonding *bond)
187{
188 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
189 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
Mitch Williams0d206a32005-11-09 10:35:30 -0800190 struct tlb_client_info *new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 int i;
192
193 spin_lock_init(&(bond_info->tx_hashtbl_lock));
194
Joe Jin243cb4e2007-02-06 14:16:40 -0800195 new_hashtbl = kzalloc(size, GFP_KERNEL);
Mitch Williams0d206a32005-11-09 10:35:30 -0800196 if (!new_hashtbl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -0800198 ": %s: Error: Failed to allocate TLB hash table\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 return -1;
201 }
Mitch Williams0d206a32005-11-09 10:35:30 -0800202 _lock_tx_hashtbl(bond);
203
204 bond_info->tx_hashtbl = new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
207 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
208 }
209
210 _unlock_tx_hashtbl(bond);
211
212 return 0;
213}
214
215/* Must be called only after all slaves have been released */
216static void tlb_deinitialize(struct bonding *bond)
217{
218 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
219
220 _lock_tx_hashtbl(bond);
221
222 kfree(bond_info->tx_hashtbl);
223 bond_info->tx_hashtbl = NULL;
224
225 _unlock_tx_hashtbl(bond);
226}
227
228/* Caller must hold bond lock for read */
229static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
230{
231 struct slave *slave, *least_loaded;
232 s64 max_gap;
233 int i, found = 0;
234
235 /* Find the first enabled slave */
236 bond_for_each_slave(bond, slave, i) {
237 if (SLAVE_IS_OK(slave)) {
238 found = 1;
239 break;
240 }
241 }
242
243 if (!found) {
244 return NULL;
245 }
246
247 least_loaded = slave;
248 max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */
249 (s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
250
251 /* Find the slave with the largest gap */
252 bond_for_each_slave_from(bond, slave, i, least_loaded) {
253 if (SLAVE_IS_OK(slave)) {
254 s64 gap = (s64)(slave->speed << 20) -
255 (s64)(SLAVE_TLB_INFO(slave).load << 3);
256 if (max_gap < gap) {
257 least_loaded = slave;
258 max_gap = gap;
259 }
260 }
261 }
262
263 return least_loaded;
264}
265
266/* Caller must hold bond lock for read */
267static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
268{
269 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
270 struct tlb_client_info *hash_table;
271 struct slave *assigned_slave;
272
273 _lock_tx_hashtbl(bond);
274
275 hash_table = bond_info->tx_hashtbl;
276 assigned_slave = hash_table[hash_index].tx_slave;
277 if (!assigned_slave) {
278 assigned_slave = tlb_get_least_loaded_slave(bond);
279
280 if (assigned_slave) {
281 struct tlb_slave_info *slave_info =
282 &(SLAVE_TLB_INFO(assigned_slave));
283 u32 next_index = slave_info->head;
284
285 hash_table[hash_index].tx_slave = assigned_slave;
286 hash_table[hash_index].next = next_index;
287 hash_table[hash_index].prev = TLB_NULL_INDEX;
288
289 if (next_index != TLB_NULL_INDEX) {
290 hash_table[next_index].prev = hash_index;
291 }
292
293 slave_info->head = hash_index;
294 slave_info->load +=
295 hash_table[hash_index].load_history;
296 }
297 }
298
299 if (assigned_slave) {
300 hash_table[hash_index].tx_bytes += skb_len;
301 }
302
303 _unlock_tx_hashtbl(bond);
304
305 return assigned_slave;
306}
307
308/*********************** rlb specific functions ***************************/
309static inline void _lock_rx_hashtbl(struct bonding *bond)
310{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700311 spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
314static inline void _unlock_rx_hashtbl(struct bonding *bond)
315{
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700316 spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
319/* when an ARP REPLY is received from a client update its info
320 * in the rx_hashtbl
321 */
322static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
323{
324 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
325 struct rlb_client_info *client_info;
326 u32 hash_index;
327
328 _lock_rx_hashtbl(bond);
329
330 hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
331 client_info = &(bond_info->rx_hashtbl[hash_index]);
332
333 if ((client_info->assigned) &&
334 (client_info->ip_src == arp->ip_dst) &&
335 (client_info->ip_dst == arp->ip_src)) {
336 /* update the clients MAC address */
337 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
338 client_info->ntt = 1;
339 bond_info->rx_ntt = 1;
340 }
341
342 _unlock_rx_hashtbl(bond);
343}
344
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700345static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
Jay Vosburgh6146b1a2008-11-04 17:51:15 -0800347 struct bonding *bond;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 struct arp_pkt *arp = (struct arp_pkt *)skb->data;
349 int res = NET_RX_DROP;
350
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900351 if (dev_net(bond_dev) != &init_net)
Eric W. Biedermane730c152007-09-17 11:53:39 -0700352 goto out;
353
Jay Vosburgh6146b1a2008-11-04 17:51:15 -0800354 while (bond_dev->priv_flags & IFF_802_1Q_VLAN)
355 bond_dev = vlan_dev_real_dev(bond_dev);
356
357 if (!(bond_dev->priv_flags & IFF_BONDING) ||
358 !(bond_dev->flags & IFF_MASTER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 if (!arp) {
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800362 pr_debug("Packet has no ARP data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 goto out;
364 }
365
366 if (skb->len < sizeof(struct arp_pkt)) {
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800367 pr_debug("Packet is too small to be an ARP\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 goto out;
369 }
370
371 if (arp->op_code == htons(ARPOP_REPLY)) {
372 /* update rx hash table for this ARP */
Jay Vosburgh6146b1a2008-11-04 17:51:15 -0800373 printk("rar: update orig %s bond_dev %s\n", orig_dev->name,
374 bond_dev->name);
Wang Chen454d7c92008-11-12 23:37:49 -0800375 bond = netdev_priv(bond_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 rlb_update_entry_from_arp(bond, arp);
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800377 pr_debug("Server received an ARP Reply from client\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 }
379
380 res = NET_RX_SUCCESS;
381
382out:
383 dev_kfree_skb(skb);
384
385 return res;
386}
387
388/* Caller must hold bond lock for read */
389static struct slave *rlb_next_rx_slave(struct bonding *bond)
390{
391 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
392 struct slave *rx_slave, *slave, *start_at;
393 int i = 0;
394
395 if (bond_info->next_rx_slave) {
396 start_at = bond_info->next_rx_slave;
397 } else {
398 start_at = bond->first_slave;
399 }
400
401 rx_slave = NULL;
402
403 bond_for_each_slave_from(bond, slave, i, start_at) {
404 if (SLAVE_IS_OK(slave)) {
405 if (!rx_slave) {
406 rx_slave = slave;
407 } else if (slave->speed > rx_slave->speed) {
408 rx_slave = slave;
409 }
410 }
411 }
412
413 if (rx_slave) {
414 bond_info->next_rx_slave = rx_slave->next;
415 }
416
417 return rx_slave;
418}
419
420/* teach the switch the mac of a disabled slave
421 * on the primary for fault tolerance
422 *
423 * Caller must hold bond->curr_slave_lock for write or bond lock for write
424 */
425static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
426{
427 if (!bond->curr_active_slave) {
428 return;
429 }
430
431 if (!bond->alb_info.primary_is_promisc) {
Wang Chen7e1a1ac2008-07-14 20:51:36 -0700432 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
433 bond->alb_info.primary_is_promisc = 1;
434 else
435 bond->alb_info.primary_is_promisc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 }
437
438 bond->alb_info.rlb_promisc_timeout_counter = 0;
439
440 alb_send_learning_packets(bond->curr_active_slave, addr);
441}
442
443/* slave being removed should not be active at this point
444 *
445 * Caller must hold bond lock for read
446 */
447static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
448{
449 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
450 struct rlb_client_info *rx_hash_table;
451 u32 index, next_index;
452
453 /* clear slave from rx_hashtbl */
454 _lock_rx_hashtbl(bond);
455
456 rx_hash_table = bond_info->rx_hashtbl;
457 index = bond_info->rx_hashtbl_head;
458 for (; index != RLB_NULL_INDEX; index = next_index) {
459 next_index = rx_hash_table[index].next;
460 if (rx_hash_table[index].slave == slave) {
461 struct slave *assigned_slave = rlb_next_rx_slave(bond);
462
463 if (assigned_slave) {
464 rx_hash_table[index].slave = assigned_slave;
465 if (memcmp(rx_hash_table[index].mac_dst,
466 mac_bcast, ETH_ALEN)) {
467 bond_info->rx_hashtbl[index].ntt = 1;
468 bond_info->rx_ntt = 1;
469 /* A slave has been removed from the
470 * table because it is either disabled
471 * or being released. We must retry the
472 * update to avoid clients from not
473 * being updated & disconnecting when
474 * there is stress
475 */
476 bond_info->rlb_update_retry_counter =
477 RLB_UPDATE_RETRY;
478 }
479 } else { /* there is no active slave */
480 rx_hash_table[index].slave = NULL;
481 }
482 }
483 }
484
485 _unlock_rx_hashtbl(bond);
486
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700487 write_lock_bh(&bond->curr_slave_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 if (slave != bond->curr_active_slave) {
490 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
491 }
492
Jay Vosburgh6603a6f2007-10-17 17:37:50 -0700493 write_unlock_bh(&bond->curr_slave_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
496static void rlb_update_client(struct rlb_client_info *client_info)
497{
498 int i;
499
500 if (!client_info->slave) {
501 return;
502 }
503
504 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
505 struct sk_buff *skb;
506
507 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
508 client_info->ip_dst,
509 client_info->slave->dev,
510 client_info->ip_src,
511 client_info->mac_dst,
512 client_info->slave->dev->dev_addr,
513 client_info->mac_dst);
514 if (!skb) {
515 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -0800516 ": %s: Error: failed to create an ARP packet\n",
517 client_info->slave->dev->master->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 continue;
519 }
520
521 skb->dev = client_info->slave->dev;
522
523 if (client_info->tag) {
524 skb = vlan_put_tag(skb, client_info->vlan_id);
525 if (!skb) {
526 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -0800527 ": %s: Error: failed to insert VLAN tag\n",
528 client_info->slave->dev->master->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 continue;
530 }
531 }
532
533 arp_xmit(skb);
534 }
535}
536
537/* sends ARP REPLIES that update the clients that need updating */
538static void rlb_update_rx_clients(struct bonding *bond)
539{
540 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
541 struct rlb_client_info *client_info;
542 u32 hash_index;
543
544 _lock_rx_hashtbl(bond);
545
546 hash_index = bond_info->rx_hashtbl_head;
547 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
548 client_info = &(bond_info->rx_hashtbl[hash_index]);
549 if (client_info->ntt) {
550 rlb_update_client(client_info);
551 if (bond_info->rlb_update_retry_counter == 0) {
552 client_info->ntt = 0;
553 }
554 }
555 }
556
557 /* do not update the entries again untill this counter is zero so that
558 * not to confuse the clients.
559 */
560 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
561
562 _unlock_rx_hashtbl(bond);
563}
564
565/* The slave was assigned a new mac address - update the clients */
566static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
567{
568 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
569 struct rlb_client_info *client_info;
570 int ntt = 0;
571 u32 hash_index;
572
573 _lock_rx_hashtbl(bond);
574
575 hash_index = bond_info->rx_hashtbl_head;
576 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
577 client_info = &(bond_info->rx_hashtbl[hash_index]);
578
579 if ((client_info->slave == slave) &&
580 memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
581 client_info->ntt = 1;
582 ntt = 1;
583 }
584 }
585
586 // update the team's flag only after the whole iteration
587 if (ntt) {
588 bond_info->rx_ntt = 1;
589 //fasten the change
590 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
591 }
592
593 _unlock_rx_hashtbl(bond);
594}
595
596/* mark all clients using src_ip to be updated */
Al Virod3bb52b2007-08-22 20:06:58 -0400597static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598{
599 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
600 struct rlb_client_info *client_info;
601 u32 hash_index;
602
603 _lock_rx_hashtbl(bond);
604
605 hash_index = bond_info->rx_hashtbl_head;
606 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
607 client_info = &(bond_info->rx_hashtbl[hash_index]);
608
609 if (!client_info->slave) {
610 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -0800611 ": %s: Error: found a client with no channel in "
612 "the client's hash table\n",
613 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 continue;
615 }
616 /*update all clients using this src_ip, that are not assigned
617 * to the team's address (curr_active_slave) and have a known
618 * unicast mac address.
619 */
620 if ((client_info->ip_src == src_ip) &&
621 memcmp(client_info->slave->dev->dev_addr,
622 bond->dev->dev_addr, ETH_ALEN) &&
623 memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
624 client_info->ntt = 1;
625 bond_info->rx_ntt = 1;
626 }
627 }
628
629 _unlock_rx_hashtbl(bond);
630}
631
632/* Caller must hold both bond and ptr locks for read */
633static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
634{
635 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -0300636 struct arp_pkt *arp = arp_pkt(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 struct slave *assigned_slave;
638 struct rlb_client_info *client_info;
639 u32 hash_index = 0;
640
641 _lock_rx_hashtbl(bond);
642
643 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src));
644 client_info = &(bond_info->rx_hashtbl[hash_index]);
645
646 if (client_info->assigned) {
647 if ((client_info->ip_src == arp->ip_src) &&
648 (client_info->ip_dst == arp->ip_dst)) {
649 /* the entry is already assigned to this client */
650 if (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) {
651 /* update mac address from arp */
652 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
653 }
654
655 assigned_slave = client_info->slave;
656 if (assigned_slave) {
657 _unlock_rx_hashtbl(bond);
658 return assigned_slave;
659 }
660 } else {
661 /* the entry is already assigned to some other client,
662 * move the old client to primary (curr_active_slave) so
663 * that the new client can be assigned to this entry.
664 */
665 if (bond->curr_active_slave &&
666 client_info->slave != bond->curr_active_slave) {
667 client_info->slave = bond->curr_active_slave;
668 rlb_update_client(client_info);
669 }
670 }
671 }
672 /* assign a new slave */
673 assigned_slave = rlb_next_rx_slave(bond);
674
675 if (assigned_slave) {
676 client_info->ip_src = arp->ip_src;
677 client_info->ip_dst = arp->ip_dst;
678 /* arp->mac_dst is broadcast for arp reqeusts.
679 * will be updated with clients actual unicast mac address
680 * upon receiving an arp reply.
681 */
682 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
683 client_info->slave = assigned_slave;
684
685 if (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
686 client_info->ntt = 1;
687 bond->alb_info.rx_ntt = 1;
688 } else {
689 client_info->ntt = 0;
690 }
691
692 if (!list_empty(&bond->vlan_list)) {
Jay Vosburgh966bc6f2008-03-21 22:29:34 -0700693 if (!vlan_get_tag(skb, &client_info->vlan_id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 client_info->tag = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 }
696
697 if (!client_info->assigned) {
698 u32 prev_tbl_head = bond_info->rx_hashtbl_head;
699 bond_info->rx_hashtbl_head = hash_index;
700 client_info->next = prev_tbl_head;
701 if (prev_tbl_head != RLB_NULL_INDEX) {
702 bond_info->rx_hashtbl[prev_tbl_head].prev =
703 hash_index;
704 }
705 client_info->assigned = 1;
706 }
707 }
708
709 _unlock_rx_hashtbl(bond);
710
711 return assigned_slave;
712}
713
714/* chooses (and returns) transmit channel for arp reply
715 * does not choose channel for other arp types since they are
716 * sent on the curr_active_slave
717 */
718static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
719{
Arnaldo Carvalho de Meloa16aeb32007-03-10 16:07:19 -0300720 struct arp_pkt *arp = arp_pkt(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 struct slave *tx_slave = NULL;
722
Brian Haleyf14c4e42008-09-02 10:08:08 -0400723 if (arp->op_code == htons(ARPOP_REPLY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 /* the arp must be sent on the selected
725 * rx channel
726 */
727 tx_slave = rlb_choose_channel(skb, bond);
728 if (tx_slave) {
729 memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
730 }
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800731 pr_debug("Server sent ARP Reply packet\n");
Brian Haleyf14c4e42008-09-02 10:08:08 -0400732 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 /* Create an entry in the rx_hashtbl for this client as a
734 * place holder.
735 * When the arp reply is received the entry will be updated
736 * with the correct unicast address of the client.
737 */
738 rlb_choose_channel(skb, bond);
739
740 /* The ARP relpy packets must be delayed so that
741 * they can cancel out the influence of the ARP request.
742 */
743 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
744
745 /* arp requests are broadcast and are sent on the primary
746 * the arp request will collapse all clients on the subnet to
747 * the primary slave. We must register these clients to be
748 * updated with their assigned mac.
749 */
750 rlb_req_update_subnet_clients(bond, arp->ip_src);
Holger Eitzenberger5a03cdb2008-12-09 23:09:22 -0800751 pr_debug("Server sent ARP Request packet\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
753
754 return tx_slave;
755}
756
757/* Caller must hold bond lock for read */
758static void rlb_rebalance(struct bonding *bond)
759{
760 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
761 struct slave *assigned_slave;
762 struct rlb_client_info *client_info;
763 int ntt;
764 u32 hash_index;
765
766 _lock_rx_hashtbl(bond);
767
768 ntt = 0;
769 hash_index = bond_info->rx_hashtbl_head;
770 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
771 client_info = &(bond_info->rx_hashtbl[hash_index]);
772 assigned_slave = rlb_next_rx_slave(bond);
773 if (assigned_slave && (client_info->slave != assigned_slave)) {
774 client_info->slave = assigned_slave;
775 client_info->ntt = 1;
776 ntt = 1;
777 }
778 }
779
780 /* update the team's flag only after the whole iteration */
781 if (ntt) {
782 bond_info->rx_ntt = 1;
783 }
784 _unlock_rx_hashtbl(bond);
785}
786
787/* Caller must hold rx_hashtbl lock */
788static void rlb_init_table_entry(struct rlb_client_info *entry)
789{
790 memset(entry, 0, sizeof(struct rlb_client_info));
791 entry->next = RLB_NULL_INDEX;
792 entry->prev = RLB_NULL_INDEX;
793}
794
795static int rlb_initialize(struct bonding *bond)
796{
797 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
798 struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type);
Mitch Williams0d206a32005-11-09 10:35:30 -0800799 struct rlb_client_info *new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
801 int i;
802
803 spin_lock_init(&(bond_info->rx_hashtbl_lock));
804
Mitch Williams0d206a32005-11-09 10:35:30 -0800805 new_hashtbl = kmalloc(size, GFP_KERNEL);
806 if (!new_hashtbl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -0800808 ": %s: Error: Failed to allocate RLB hash table\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 return -1;
811 }
Mitch Williams0d206a32005-11-09 10:35:30 -0800812 _lock_rx_hashtbl(bond);
813
814 bond_info->rx_hashtbl = new_hashtbl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
816 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
817
818 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
819 rlb_init_table_entry(bond_info->rx_hashtbl + i);
820 }
821
822 _unlock_rx_hashtbl(bond);
823
824 /*initialize packet type*/
Harvey Harrison09640e62009-02-01 00:45:17 -0800825 pk_type->type = cpu_to_be16(ETH_P_ARP);
Jay Vosburgh6146b1a2008-11-04 17:51:15 -0800826 pk_type->dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 pk_type->func = rlb_arp_recv;
828
829 /* register to receive ARPs */
830 dev_add_pack(pk_type);
831
832 return 0;
833}
834
835static void rlb_deinitialize(struct bonding *bond)
836{
837 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
838
839 dev_remove_pack(&(bond_info->rlb_pkt_type));
840
841 _lock_rx_hashtbl(bond);
842
843 kfree(bond_info->rx_hashtbl);
844 bond_info->rx_hashtbl = NULL;
845 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
846
847 _unlock_rx_hashtbl(bond);
848}
849
850static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
851{
852 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
853 u32 curr_index;
854
855 _lock_rx_hashtbl(bond);
856
857 curr_index = bond_info->rx_hashtbl_head;
858 while (curr_index != RLB_NULL_INDEX) {
859 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
860 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
861 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
862
863 if (curr->tag && (curr->vlan_id == vlan_id)) {
864 if (curr_index == bond_info->rx_hashtbl_head) {
865 bond_info->rx_hashtbl_head = next_index;
866 }
867 if (prev_index != RLB_NULL_INDEX) {
868 bond_info->rx_hashtbl[prev_index].next = next_index;
869 }
870 if (next_index != RLB_NULL_INDEX) {
871 bond_info->rx_hashtbl[next_index].prev = prev_index;
872 }
873
874 rlb_init_table_entry(curr);
875 }
876
877 curr_index = next_index;
878 }
879
880 _unlock_rx_hashtbl(bond);
881}
882
883/*********************** tlb/rlb shared functions *********************/
884
885static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
886{
887 struct bonding *bond = bond_get_bond_by_slave(slave);
888 struct learning_pkt pkt;
889 int size = sizeof(struct learning_pkt);
890 int i;
891
892 memset(&pkt, 0, size);
893 memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
894 memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
Harvey Harrison09640e62009-02-01 00:45:17 -0800895 pkt.type = cpu_to_be16(ETH_P_LOOP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
897 for (i = 0; i < MAX_LP_BURST; i++) {
898 struct sk_buff *skb;
899 char *data;
900
901 skb = dev_alloc_skb(size);
902 if (!skb) {
903 return;
904 }
905
906 data = skb_put(skb, size);
907 memcpy(data, &pkt, size);
908
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700909 skb_reset_mac_header(skb);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700910 skb->network_header = skb->mac_header + ETH_HLEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 skb->protocol = pkt.type;
912 skb->priority = TC_PRIO_CONTROL;
913 skb->dev = slave->dev;
914
915 if (!list_empty(&bond->vlan_list)) {
916 struct vlan_entry *vlan;
917
918 vlan = bond_next_vlan(bond,
919 bond->alb_info.current_alb_vlan);
920
921 bond->alb_info.current_alb_vlan = vlan;
922 if (!vlan) {
923 kfree_skb(skb);
924 continue;
925 }
926
927 skb = vlan_put_tag(skb, vlan->vlan_id);
928 if (!skb) {
929 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -0800930 ": %s: Error: failed to insert VLAN tag\n",
931 bond->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 continue;
933 }
934 }
935
936 dev_queue_xmit(skb);
937 }
938}
939
940/* hw is a boolean parameter that determines whether we should try and
941 * set the hw address of the device as well as the hw address of the
942 * net_device
943 */
944static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
945{
946 struct net_device *dev = slave->dev;
947 struct sockaddr s_addr;
948
949 if (!hw) {
950 memcpy(dev->dev_addr, addr, dev->addr_len);
951 return 0;
952 }
953
954 /* for rlb each slave must have a unique hw mac addresses so that */
955 /* each slave will receive packets destined to a different mac */
956 memcpy(s_addr.sa_data, addr, dev->addr_len);
957 s_addr.sa_family = dev->type;
958 if (dev_set_mac_address(dev, &s_addr)) {
959 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -0800960 ": %s: Error: dev_set_mac_address of dev %s failed! ALB "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 "mode requires that the base driver support setting "
962 "the hw address also when the network device's "
963 "interface is open\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -0800964 dev->master->name, dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 return -EOPNOTSUPP;
966 }
967 return 0;
968}
969
Jay Vosburgh059fe7a2007-10-17 17:37:49 -0700970/*
971 * Swap MAC addresses between two slaves.
972 *
973 * Called with RTNL held, and no other locks.
974 *
975 */
976
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
978{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 u8 tmp_mac_addr[ETH_ALEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
981 memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
982 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
983 alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
984
Jay Vosburgh059fe7a2007-10-17 17:37:49 -0700985}
986
987/*
988 * Send learning packets after MAC address swap.
989 *
Jay Vosburgh25433312008-01-17 16:24:59 -0800990 * Called with RTNL and no other locks
Jay Vosburgh059fe7a2007-10-17 17:37:49 -0700991 */
992static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
993 struct slave *slave2)
994{
995 int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
996 struct slave *disabled_slave = NULL;
997
Jay Vosburgh25433312008-01-17 16:24:59 -0800998 ASSERT_RTNL();
999
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 /* fasten the change in the switch */
1001 if (SLAVE_IS_OK(slave1)) {
1002 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
1003 if (bond->alb_info.rlb_enabled) {
1004 /* inform the clients that the mac address
1005 * has changed
1006 */
1007 rlb_req_update_slave_clients(bond, slave1);
1008 }
1009 } else {
1010 disabled_slave = slave1;
1011 }
1012
1013 if (SLAVE_IS_OK(slave2)) {
1014 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
1015 if (bond->alb_info.rlb_enabled) {
1016 /* inform the clients that the mac address
1017 * has changed
1018 */
1019 rlb_req_update_slave_clients(bond, slave2);
1020 }
1021 } else {
1022 disabled_slave = slave2;
1023 }
1024
1025 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1026 /* A disabled slave was assigned an active mac addr */
1027 rlb_teach_disabled_mac_on_primary(bond,
1028 disabled_slave->dev->dev_addr);
1029 }
1030}
1031
1032/**
1033 * alb_change_hw_addr_on_detach
1034 * @bond: bonding we're working on
1035 * @slave: the slave that was just detached
1036 *
1037 * We assume that @slave was already detached from the slave list.
1038 *
1039 * If @slave's permanent hw address is different both from its current
1040 * address and from @bond's address, then somewhere in the bond there's
1041 * a slave that has @slave's permanet address as its current address.
1042 * We'll make sure that that slave no longer uses @slave's permanent address.
1043 *
Jay Vosburgh25433312008-01-17 16:24:59 -08001044 * Caller must hold RTNL and no other locks
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 */
1046static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1047{
1048 int perm_curr_diff;
1049 int perm_bond_diff;
1050
1051 perm_curr_diff = memcmp(slave->perm_hwaddr,
1052 slave->dev->dev_addr,
1053 ETH_ALEN);
1054 perm_bond_diff = memcmp(slave->perm_hwaddr,
1055 bond->dev->dev_addr,
1056 ETH_ALEN);
1057
1058 if (perm_curr_diff && perm_bond_diff) {
1059 struct slave *tmp_slave;
1060 int i, found = 0;
1061
1062 bond_for_each_slave(bond, tmp_slave, i) {
1063 if (!memcmp(slave->perm_hwaddr,
1064 tmp_slave->dev->dev_addr,
1065 ETH_ALEN)) {
1066 found = 1;
1067 break;
1068 }
1069 }
1070
1071 if (found) {
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001072 /* locking: needs RTNL and nothing else */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 alb_swap_mac_addr(bond, slave, tmp_slave);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001074 alb_fasten_mac_swap(bond, slave, tmp_slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 }
1076 }
1077}
1078
1079/**
1080 * alb_handle_addr_collision_on_attach
1081 * @bond: bonding we're working on
1082 * @slave: the slave that was just attached
1083 *
1084 * checks uniqueness of slave's mac address and handles the case the
1085 * new slave uses the bonds mac address.
1086 *
1087 * If the permanent hw address of @slave is @bond's hw address, we need to
1088 * find a different hw address to give @slave, that isn't in use by any other
1089 * slave in the bond. This address must be, of course, one of the premanent
1090 * addresses of the other slaves.
1091 *
1092 * We go over the slave list, and for each slave there we compare its
1093 * permanent hw address with the current address of all the other slaves.
1094 * If no match was found, then we've found a slave with a permanent address
1095 * that isn't used by any other slave in the bond, so we can assign it to
1096 * @slave.
1097 *
1098 * assumption: this function is called before @slave is attached to the
1099 * bond slave list.
1100 *
1101 * caller must hold the bond lock for write since the mac addresses are compared
1102 * and may be swapped.
1103 */
1104static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1105{
1106 struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1107 struct slave *has_bond_addr = bond->curr_active_slave;
1108 int i, j, found = 0;
1109
1110 if (bond->slave_cnt == 0) {
1111 /* this is the first slave */
1112 return 0;
1113 }
1114
1115 /* if slave's mac address differs from bond's mac address
1116 * check uniqueness of slave's mac address against the other
1117 * slaves in the bond.
1118 */
1119 if (memcmp(slave->perm_hwaddr, bond->dev->dev_addr, ETH_ALEN)) {
1120 bond_for_each_slave(bond, tmp_slave1, i) {
1121 if (!memcmp(tmp_slave1->dev->dev_addr, slave->dev->dev_addr,
1122 ETH_ALEN)) {
1123 found = 1;
1124 break;
1125 }
1126 }
1127
John W. Linville6b38aef2005-07-28 15:00:15 -04001128 if (!found)
1129 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130
John W. Linville6b38aef2005-07-28 15:00:15 -04001131 /* Try setting slave mac to bond address and fall-through
1132 to code handling that situation below... */
1133 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1134 bond->alb_info.rlb_enabled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 }
1136
1137 /* The slave's address is equal to the address of the bond.
1138 * Search for a spare address in the bond for this slave.
1139 */
1140 free_mac_slave = NULL;
1141
1142 bond_for_each_slave(bond, tmp_slave1, i) {
1143 found = 0;
1144 bond_for_each_slave(bond, tmp_slave2, j) {
1145 if (!memcmp(tmp_slave1->perm_hwaddr,
1146 tmp_slave2->dev->dev_addr,
1147 ETH_ALEN)) {
1148 found = 1;
1149 break;
1150 }
1151 }
1152
1153 if (!found) {
1154 /* no slave has tmp_slave1's perm addr
1155 * as its curr addr
1156 */
1157 free_mac_slave = tmp_slave1;
1158 break;
1159 }
1160
1161 if (!has_bond_addr) {
1162 if (!memcmp(tmp_slave1->dev->dev_addr,
1163 bond->dev->dev_addr,
1164 ETH_ALEN)) {
1165
1166 has_bond_addr = tmp_slave1;
1167 }
1168 }
1169 }
1170
1171 if (free_mac_slave) {
1172 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1173 bond->alb_info.rlb_enabled);
1174
1175 printk(KERN_WARNING DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -08001176 ": %s: Warning: the hw address of slave %s is in use by "
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 "the bond; giving it the hw address of %s\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -08001178 bond->dev->name, slave->dev->name, free_mac_slave->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
1180 } else if (has_bond_addr) {
1181 printk(KERN_ERR DRV_NAME
Mitch Williams4e0952c2005-11-09 10:34:57 -08001182 ": %s: Error: the hw address of slave %s is in use by the "
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 "bond; couldn't find a slave with a free hw address to "
1184 "give it (this should not have happened)\n",
Mitch Williams4e0952c2005-11-09 10:34:57 -08001185 bond->dev->name, slave->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 return -EFAULT;
1187 }
1188
1189 return 0;
1190}
1191
1192/**
1193 * alb_set_mac_address
1194 * @bond:
1195 * @addr:
1196 *
1197 * In TLB mode all slaves are configured to the bond's hw address, but set
1198 * their dev_addr field to different addresses (based on their permanent hw
1199 * addresses).
1200 *
1201 * For each slave, this function sets the interface to the new address and then
1202 * changes its dev_addr field to its previous value.
1203 *
1204 * Unwinding assumes bond's mac address has not yet changed.
1205 */
1206static int alb_set_mac_address(struct bonding *bond, void *addr)
1207{
1208 struct sockaddr sa;
1209 struct slave *slave, *stop_at;
1210 char tmp_addr[ETH_ALEN];
1211 int res;
1212 int i;
1213
1214 if (bond->alb_info.rlb_enabled) {
1215 return 0;
1216 }
1217
1218 bond_for_each_slave(bond, slave, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 /* save net_device's current hw address */
1220 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1221
1222 res = dev_set_mac_address(slave->dev, addr);
1223
1224 /* restore net_device's hw address */
1225 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1226
Stephen Hemmingereb7cc592008-11-19 21:56:05 -08001227 if (res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 goto unwind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 }
1230
1231 return 0;
1232
1233unwind:
1234 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1235 sa.sa_family = bond->dev->type;
1236
1237 /* unwind from head to the slave that failed */
1238 stop_at = slave;
1239 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1240 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1241 dev_set_mac_address(slave->dev, &sa);
1242 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1243 }
1244
1245 return res;
1246}
1247
1248/************************ exported alb funcions ************************/
1249
1250int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1251{
1252 int res;
1253
1254 res = tlb_initialize(bond);
1255 if (res) {
1256 return res;
1257 }
1258
1259 if (rlb_enabled) {
1260 bond->alb_info.rlb_enabled = 1;
1261 /* initialize rlb */
1262 res = rlb_initialize(bond);
1263 if (res) {
1264 tlb_deinitialize(bond);
1265 return res;
1266 }
Mitch Williamsb76850a2005-11-09 10:35:35 -08001267 } else {
1268 bond->alb_info.rlb_enabled = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 }
1270
1271 return 0;
1272}
1273
1274void bond_alb_deinitialize(struct bonding *bond)
1275{
1276 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1277
1278 tlb_deinitialize(bond);
1279
1280 if (bond_info->rlb_enabled) {
1281 rlb_deinitialize(bond);
1282 }
1283}
1284
1285int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1286{
Wang Chen454d7c92008-11-12 23:37:49 -08001287 struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 struct ethhdr *eth_data;
1289 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1290 struct slave *tx_slave = NULL;
Al Virod3bb52b2007-08-22 20:06:58 -04001291 static const __be32 ip_bcast = htonl(0xffffffff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 int hash_size = 0;
1293 int do_tx_balance = 1;
1294 u32 hash_index = 0;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001295 const u8 *hash_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 int res = 1;
Vlad Yasevich2d1ea192008-08-28 15:38:41 -04001297 struct ipv6hdr *ip6hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001299 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 eth_data = eth_hdr(skb);
1301
1302 /* make sure that the curr_active_slave and the slaves list do
1303 * not change during tx
1304 */
1305 read_lock(&bond->lock);
1306 read_lock(&bond->curr_slave_lock);
1307
1308 if (!BOND_IS_OK(bond)) {
1309 goto out;
1310 }
1311
1312 switch (ntohs(skb->protocol)) {
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001313 case ETH_P_IP: {
1314 const struct iphdr *iph = ip_hdr(skb);
1315
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) ||
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001317 (iph->daddr == ip_bcast) ||
1318 (iph->protocol == IPPROTO_IGMP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 do_tx_balance = 0;
1320 break;
1321 }
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001322 hash_start = (char *)&(iph->daddr);
1323 hash_size = sizeof(iph->daddr);
1324 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 break;
1326 case ETH_P_IPV6:
Vlad Yasevich2d1ea192008-08-28 15:38:41 -04001327 /* IPv6 doesn't really use broadcast mac address, but leave
1328 * that here just in case.
1329 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {
1331 do_tx_balance = 0;
1332 break;
1333 }
1334
Vlad Yasevich2d1ea192008-08-28 15:38:41 -04001335 /* IPv6 uses all-nodes multicast as an equivalent to
1336 * broadcasts in IPv4.
1337 */
1338 if (memcmp(eth_data->h_dest, mac_v6_allmcast, ETH_ALEN) == 0) {
1339 do_tx_balance = 0;
1340 break;
1341 }
1342
1343 /* Additianally, DAD probes should not be tx-balanced as that
1344 * will lead to false positives for duplicate addresses and
1345 * prevent address configuration from working.
1346 */
1347 ip6hdr = ipv6_hdr(skb);
1348 if (ipv6_addr_any(&ip6hdr->saddr)) {
1349 do_tx_balance = 0;
1350 break;
1351 }
1352
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -07001353 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1354 hash_size = sizeof(ipv6_hdr(skb)->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 break;
1356 case ETH_P_IPX:
Al Virod3bb52b2007-08-22 20:06:58 -04001357 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 /* something is wrong with this packet */
1359 do_tx_balance = 0;
1360 break;
1361 }
1362
1363 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1364 /* The only protocol worth balancing in
1365 * this family since it has an "ARP" like
1366 * mechanism
1367 */
1368 do_tx_balance = 0;
1369 break;
1370 }
1371
1372 hash_start = (char*)eth_data->h_dest;
1373 hash_size = ETH_ALEN;
1374 break;
1375 case ETH_P_ARP:
1376 do_tx_balance = 0;
1377 if (bond_info->rlb_enabled) {
1378 tx_slave = rlb_arp_xmit(skb, bond);
1379 }
1380 break;
1381 default:
1382 do_tx_balance = 0;
1383 break;
1384 }
1385
1386 if (do_tx_balance) {
1387 hash_index = _simple_hash(hash_start, hash_size);
1388 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1389 }
1390
1391 if (!tx_slave) {
1392 /* unbalanced or unassigned, send through primary */
1393 tx_slave = bond->curr_active_slave;
1394 bond_info->unbalanced_load += skb->len;
1395 }
1396
1397 if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1398 if (tx_slave != bond->curr_active_slave) {
1399 memcpy(eth_data->h_source,
1400 tx_slave->dev->dev_addr,
1401 ETH_ALEN);
1402 }
1403
1404 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1405 } else {
1406 if (tx_slave) {
1407 tlb_clear_slave(bond, tx_slave, 0);
1408 }
1409 }
1410
1411out:
1412 if (res) {
1413 /* no suitable interface, frame not sent */
1414 dev_kfree_skb(skb);
1415 }
1416 read_unlock(&bond->curr_slave_lock);
1417 read_unlock(&bond->lock);
1418 return 0;
1419}
1420
Jay Vosburgh1b76b312007-10-17 17:37:45 -07001421void bond_alb_monitor(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422{
Jay Vosburgh1b76b312007-10-17 17:37:45 -07001423 struct bonding *bond = container_of(work, struct bonding,
1424 alb_work.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1426 struct slave *slave;
1427 int i;
1428
1429 read_lock(&bond->lock);
1430
1431 if (bond->kill_timers) {
1432 goto out;
1433 }
1434
1435 if (bond->slave_cnt == 0) {
1436 bond_info->tx_rebalance_counter = 0;
1437 bond_info->lp_counter = 0;
1438 goto re_arm;
1439 }
1440
1441 bond_info->tx_rebalance_counter++;
1442 bond_info->lp_counter++;
1443
1444 /* send learning packets */
1445 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1446 /* change of curr_active_slave involves swapping of mac addresses.
1447 * in order to avoid this swapping from happening while
1448 * sending the learning packets, the curr_slave_lock must be held for
1449 * read.
1450 */
1451 read_lock(&bond->curr_slave_lock);
1452
1453 bond_for_each_slave(bond, slave, i) {
Mitch Williamse944ef72005-11-09 10:36:50 -08001454 alb_send_learning_packets(slave, slave->dev->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 }
1456
1457 read_unlock(&bond->curr_slave_lock);
1458
1459 bond_info->lp_counter = 0;
1460 }
1461
1462 /* rebalance tx traffic */
1463 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1464
1465 read_lock(&bond->curr_slave_lock);
1466
1467 bond_for_each_slave(bond, slave, i) {
1468 tlb_clear_slave(bond, slave, 1);
1469 if (slave == bond->curr_active_slave) {
1470 SLAVE_TLB_INFO(slave).load =
1471 bond_info->unbalanced_load /
1472 BOND_TLB_REBALANCE_INTERVAL;
1473 bond_info->unbalanced_load = 0;
1474 }
1475 }
1476
1477 read_unlock(&bond->curr_slave_lock);
1478
1479 bond_info->tx_rebalance_counter = 0;
1480 }
1481
1482 /* handle rlb stuff */
1483 if (bond_info->rlb_enabled) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484 if (bond_info->primary_is_promisc &&
1485 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1486
Jay Vosburghd0e81b72007-10-17 17:37:51 -07001487 /*
1488 * dev_set_promiscuity requires rtnl and
1489 * nothing else.
1490 */
1491 read_unlock(&bond->lock);
1492 rtnl_lock();
1493
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 bond_info->rlb_promisc_timeout_counter = 0;
1495
1496 /* If the primary was set to promiscuous mode
1497 * because a slave was disabled then
1498 * it can now leave promiscuous mode.
1499 */
1500 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1501 bond_info->primary_is_promisc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502
Jay Vosburghd0e81b72007-10-17 17:37:51 -07001503 rtnl_unlock();
1504 read_lock(&bond->lock);
1505 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
1507 if (bond_info->rlb_rebalance) {
1508 bond_info->rlb_rebalance = 0;
1509 rlb_rebalance(bond);
1510 }
1511
1512 /* check if clients need updating */
1513 if (bond_info->rx_ntt) {
1514 if (bond_info->rlb_update_delay_counter) {
1515 --bond_info->rlb_update_delay_counter;
1516 } else {
1517 rlb_update_rx_clients(bond);
1518 if (bond_info->rlb_update_retry_counter) {
1519 --bond_info->rlb_update_retry_counter;
1520 } else {
1521 bond_info->rx_ntt = 0;
1522 }
1523 }
1524 }
1525 }
1526
1527re_arm:
Jay Vosburgh1b76b312007-10-17 17:37:45 -07001528 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529out:
1530 read_unlock(&bond->lock);
1531}
1532
1533/* assumption: called before the slave is attached to the bond
1534 * and not locked by the bond lock
1535 */
1536int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1537{
1538 int res;
1539
1540 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1541 bond->alb_info.rlb_enabled);
1542 if (res) {
1543 return res;
1544 }
1545
1546 /* caller must hold the bond lock for write since the mac addresses
1547 * are compared and may be swapped.
1548 */
Jay Vosburgh6603a6f2007-10-17 17:37:50 -07001549 read_lock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550
1551 res = alb_handle_addr_collision_on_attach(bond, slave);
1552
Jay Vosburgh6603a6f2007-10-17 17:37:50 -07001553 read_unlock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554
1555 if (res) {
1556 return res;
1557 }
1558
1559 tlb_init_slave(slave);
1560
1561 /* order a rebalance ASAP */
1562 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1563
1564 if (bond->alb_info.rlb_enabled) {
1565 bond->alb_info.rlb_rebalance = 1;
1566 }
1567
1568 return 0;
1569}
1570
Jay Vosburgh25433312008-01-17 16:24:59 -08001571/*
1572 * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1573 * if necessary.
1574 *
1575 * Caller must hold RTNL and no other locks
1576 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1578{
1579 if (bond->slave_cnt > 1) {
1580 alb_change_hw_addr_on_detach(bond, slave);
1581 }
1582
1583 tlb_clear_slave(bond, slave, 0);
1584
1585 if (bond->alb_info.rlb_enabled) {
1586 bond->alb_info.next_rx_slave = NULL;
1587 rlb_clear_slave(bond, slave);
1588 }
1589}
1590
1591/* Caller must hold bond lock for read */
1592void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1593{
1594 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1595
1596 if (link == BOND_LINK_DOWN) {
1597 tlb_clear_slave(bond, slave, 0);
1598 if (bond->alb_info.rlb_enabled) {
1599 rlb_clear_slave(bond, slave);
1600 }
1601 } else if (link == BOND_LINK_UP) {
1602 /* order a rebalance ASAP */
1603 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1604 if (bond->alb_info.rlb_enabled) {
1605 bond->alb_info.rlb_rebalance = 1;
1606 /* If the updelay module parameter is smaller than the
1607 * forwarding delay of the switch the rebalance will
1608 * not work because the rebalance arp replies will
1609 * not be forwarded to the clients..
1610 */
1611 }
1612 }
1613}
1614
1615/**
1616 * bond_alb_handle_active_change - assign new curr_active_slave
1617 * @bond: our bonding struct
1618 * @new_slave: new slave to assign
1619 *
1620 * Set the bond->curr_active_slave to @new_slave and handle
1621 * mac address swapping and promiscuity changes as needed.
1622 *
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001623 * If new_slave is NULL, caller must hold curr_slave_lock or
1624 * bond->lock for write.
1625 *
1626 * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1627 * read and curr_slave_lock for write. Processing here may sleep, so
1628 * no other locks may be held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 */
1630void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
Hannes Eder1f78d9f2009-02-14 11:15:33 +00001631 __releases(&bond->curr_slave_lock)
1632 __releases(&bond->lock)
1633 __acquires(&bond->lock)
1634 __acquires(&bond->curr_slave_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635{
1636 struct slave *swap_slave;
1637 int i;
1638
1639 if (bond->curr_active_slave == new_slave) {
1640 return;
1641 }
1642
1643 if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1644 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1645 bond->alb_info.primary_is_promisc = 0;
1646 bond->alb_info.rlb_promisc_timeout_counter = 0;
1647 }
1648
1649 swap_slave = bond->curr_active_slave;
1650 bond->curr_active_slave = new_slave;
1651
1652 if (!new_slave || (bond->slave_cnt == 0)) {
1653 return;
1654 }
1655
1656 /* set the new curr_active_slave to the bonds mac address
1657 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1658 */
1659 if (!swap_slave) {
1660 struct slave *tmp_slave;
1661 /* find slave that is holding the bond's mac address */
1662 bond_for_each_slave(bond, tmp_slave, i) {
1663 if (!memcmp(tmp_slave->dev->dev_addr,
1664 bond->dev->dev_addr, ETH_ALEN)) {
1665 swap_slave = tmp_slave;
1666 break;
1667 }
1668 }
1669 }
1670
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001671 /*
1672 * Arrange for swap_slave and new_slave to temporarily be
1673 * ignored so we can mess with their MAC addresses without
1674 * fear of interference from transmit activity.
1675 */
1676 if (swap_slave) {
1677 tlb_clear_slave(bond, swap_slave, 1);
1678 }
1679 tlb_clear_slave(bond, new_slave, 1);
1680
1681 write_unlock_bh(&bond->curr_slave_lock);
1682 read_unlock(&bond->lock);
1683
Jay Vosburghe0138a62008-01-17 16:24:58 -08001684 ASSERT_RTNL();
1685
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1687 if (swap_slave) {
1688 /* swap mac address */
1689 alb_swap_mac_addr(bond, swap_slave, new_slave);
1690 } else {
1691 /* set the new_slave to the bond mac address */
1692 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1693 bond->alb_info.rlb_enabled);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001694 }
1695
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001696 if (swap_slave) {
1697 alb_fasten_mac_swap(bond, swap_slave, new_slave);
Jay Vosburgh25433312008-01-17 16:24:59 -08001698 read_lock(&bond->lock);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001699 } else {
Jay Vosburgh25433312008-01-17 16:24:59 -08001700 read_lock(&bond->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1702 }
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001703
1704 write_lock_bh(&bond->curr_slave_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705}
1706
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001707/*
1708 * Called with RTNL
1709 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
Hannes Eder1f78d9f2009-02-14 11:15:33 +00001711 __releases(&bond->curr_slave_lock)
1712 __releases(&bond->lock)
1713 __acquires(&bond->lock)
1714 __acquires(&bond->curr_slave_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715{
Wang Chen454d7c92008-11-12 23:37:49 -08001716 struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 struct sockaddr *sa = addr;
1718 struct slave *slave, *swap_slave;
1719 int res;
1720 int i;
1721
1722 if (!is_valid_ether_addr(sa->sa_data)) {
1723 return -EADDRNOTAVAIL;
1724 }
1725
1726 res = alb_set_mac_address(bond, addr);
1727 if (res) {
1728 return res;
1729 }
1730
1731 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1732
1733 /* If there is no curr_active_slave there is nothing else to do.
1734 * Otherwise we'll need to pass the new address to it and handle
1735 * duplications.
1736 */
1737 if (!bond->curr_active_slave) {
1738 return 0;
1739 }
1740
1741 swap_slave = NULL;
1742
1743 bond_for_each_slave(bond, slave, i) {
1744 if (!memcmp(slave->dev->dev_addr, bond_dev->dev_addr, ETH_ALEN)) {
1745 swap_slave = slave;
1746 break;
1747 }
1748 }
1749
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001750 write_unlock_bh(&bond->curr_slave_lock);
1751 read_unlock(&bond->lock);
1752
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 if (swap_slave) {
1754 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001755 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 } else {
1757 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
1758 bond->alb_info.rlb_enabled);
1759
1760 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1761 if (bond->alb_info.rlb_enabled) {
1762 /* inform clients mac address has changed */
1763 rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1764 }
1765 }
1766
Jay Vosburgh059fe7a2007-10-17 17:37:49 -07001767 read_lock(&bond->lock);
1768 write_lock_bh(&bond->curr_slave_lock);
1769
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 return 0;
1771}
1772
1773void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1774{
1775 if (bond->alb_info.current_alb_vlan &&
1776 (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1777 bond->alb_info.current_alb_vlan = NULL;
1778 }
1779
1780 if (bond->alb_info.rlb_enabled) {
1781 rlb_clear_vlan(bond, vlan_id);
1782 }
1783}
1784