]> git.openfabrics.org - ~shefty/rdma-dev.git/blob - drivers/net/bonding/bond_alb.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[~shefty/rdma-dev.git] / drivers / net / bonding / bond_alb.c
1 /*
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  *
21  */
22
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/skbuff.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/pkt_sched.h>
29 #include <linux/spinlock.h>
30 #include <linux/slab.h>
31 #include <linux/timer.h>
32 #include <linux/ip.h>
33 #include <linux/ipv6.h>
34 #include <linux/if_arp.h>
35 #include <linux/if_ether.h>
36 #include <linux/if_bonding.h>
37 #include <linux/if_vlan.h>
38 #include <linux/in.h>
39 #include <net/ipx.h>
40 #include <net/arp.h>
41 #include <net/ipv6.h>
42 #include <asm/byteorder.h>
43 #include "bonding.h"
44 #include "bond_alb.h"
45
46
47
48 #ifndef __long_aligned
49 #define __long_aligned __attribute__((aligned((sizeof(long)))))
50 #endif
51 static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
52         0xff, 0xff, 0xff, 0xff, 0xff, 0xff
53 };
54 static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
55         0x33, 0x33, 0x00, 0x00, 0x00, 0x01
56 };
57 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
58
59 #pragma pack(1)
60 struct learning_pkt {
61         u8 mac_dst[ETH_ALEN];
62         u8 mac_src[ETH_ALEN];
63         __be16 type;
64         u8 padding[ETH_ZLEN - ETH_HLEN];
65 };
66
67 struct arp_pkt {
68         __be16  hw_addr_space;
69         __be16  prot_addr_space;
70         u8      hw_addr_len;
71         u8      prot_addr_len;
72         __be16  op_code;
73         u8      mac_src[ETH_ALEN];      /* sender hardware address */
74         __be32  ip_src;                 /* sender IP address */
75         u8      mac_dst[ETH_ALEN];      /* target hardware address */
76         __be32  ip_dst;                 /* target IP address */
77 };
78 #pragma pack()
79
80 static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
81 {
82         return (struct arp_pkt *)skb_network_header(skb);
83 }
84
85 /* Forward declaration */
86 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
87
88 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
89 {
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
102 static inline void _lock_tx_hashtbl(struct bonding *bond)
103 {
104         spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
105 }
106
107 static inline void _unlock_tx_hashtbl(struct bonding *bond)
108 {
109         spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
110 }
111
112 /* Caller must hold tx_hashtbl lock */
113 static 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
126 static 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 */
133 static 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
143         /* 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                 }
151         }
152
153         tlb_init_slave(slave);
154
155         _unlock_tx_hashtbl(bond);
156 }
157
158 /* Must be called before starting the monitor timer */
159 static 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);
163         struct tlb_client_info *new_hashtbl;
164         int i;
165
166         new_hashtbl = kzalloc(size, GFP_KERNEL);
167         if (!new_hashtbl) {
168                 pr_err("%s: Error: Failed to allocate TLB hash table\n",
169                        bond->dev->name);
170                 return -1;
171         }
172         _lock_tx_hashtbl(bond);
173
174         bond_info->tx_hashtbl = new_hashtbl;
175
176         for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
177                 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
178         }
179
180         _unlock_tx_hashtbl(bond);
181
182         return 0;
183 }
184
185 /* Must be called only after all slaves have been released */
186 static 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
198 static 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
204 /* Caller must hold bond lock for read */
205 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
206 {
207         struct slave *slave, *least_loaded;
208         long long max_gap;
209         int i;
210
211         least_loaded = NULL;
212         max_gap = LLONG_MIN;
213
214         /* Find the slave with the largest gap */
215         bond_for_each_slave(bond, slave, i) {
216                 if (SLAVE_IS_OK(slave)) {
217                         long long gap = compute_gap(slave);
218
219                         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 */
230 static 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 ***************************/
272 static inline void _lock_rx_hashtbl(struct bonding *bond)
273 {
274         spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
275 }
276
277 static inline void _unlock_rx_hashtbl(struct bonding *bond)
278 {
279         spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
280 }
281
282 /* when an ARP REPLY is received from a client update its info
283  * in the rx_hashtbl
284  */
285 static 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) &&
298             (client_info->ip_dst == arp->ip_src) &&
299             (compare_ether_addr_64bits(client_info->mac_dst, arp->mac_src))) {
300                 /* 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
309 static void rlb_arp_recv(struct sk_buff *skb, struct bonding *bond,
310                          struct slave *slave)
311 {
312         struct arp_pkt *arp;
313
314         if (skb->protocol != cpu_to_be16(ETH_P_ARP))
315                 return;
316
317         arp = (struct arp_pkt *) skb->data;
318         if (!arp) {
319                 pr_debug("Packet has no ARP data\n");
320                 return;
321         }
322
323         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
324                 return;
325
326         if (skb->len < sizeof(struct arp_pkt)) {
327                 pr_debug("Packet is too small to be an ARP\n");
328                 return;
329         }
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);
334                 pr_debug("Server received an ARP Reply from client\n");
335         }
336 }
337
338 /* Caller must hold bond lock for read */
339 static 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  */
375 static 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) {
382                 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;
386         }
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  */
397 static 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;
415                                 if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst,
416                                                               mac_bcast)) {
417                                         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
437         write_lock_bh(&bond->curr_slave_lock);
438
439         if (slave != bond->curr_active_slave) {
440                 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
441         }
442
443         write_unlock_bh(&bond->curr_slave_lock);
444 }
445
446 static 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) {
465                         pr_err("%s: Error: failed to create an ARP packet\n",
466                                client_info->slave->dev->master->name);
467                         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) {
475                                 pr_err("%s: Error: failed to insert VLAN tag\n",
476                                        client_info->slave->dev->master->name);
477                                 continue;
478                         }
479                 }
480
481                 arp_xmit(skb);
482         }
483 }
484
485 /* sends ARP REPLIES that update the clients that need updating */
486 static 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
505         /* do not update the entries again until this counter is zero so that
506          * 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 */
514 static 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) &&
528                     compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
529                         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 */
545 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
546 {
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) {
558                         pr_err("%s: Error: found a client with no channel in the client's hash table\n",
559                                bond->dev->name);
560                         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) &&
567                     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)) {
570                         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 */
579 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
580 {
581         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
582         struct arp_pkt *arp = arp_pkt(skb);
583         struct slave *assigned_slave;
584         struct rlb_client_info *client_info;
585         u32 hash_index = 0;
586
587         _lock_rx_hashtbl(bond);
588
589         hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
590         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 */
596                         if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) {
597                                 /* 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
631                 if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
632                         client_info->ntt = 1;
633                         bond->alb_info.rx_ntt = 1;
634                 } else {
635                         client_info->ntt = 0;
636                 }
637
638                 if (bond_vlan_used(bond)) {
639                         if (!vlan_get_tag(skb, &client_info->vlan_id))
640                                 client_info->tag = 1;
641                 }
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  */
664 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
665 {
666         struct arp_pkt *arp = arp_pkt(skb);
667         struct slave *tx_slave = NULL;
668
669         if (arp->op_code == htons(ARPOP_REPLY)) {
670                 /* 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                 }
677                 pr_debug("Server sent ARP Reply packet\n");
678         } else if (arp->op_code == htons(ARPOP_REQUEST)) {
679                 /* 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
686                 /* The ARP reply packets must be delayed so that
687                  * 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);
697                 pr_debug("Server sent ARP Request packet\n");
698         }
699
700         return tx_slave;
701 }
702
703 /* Caller must hold bond lock for read */
704 static 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 */
734 static 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
741 static int rlb_initialize(struct bonding *bond)
742 {
743         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
744         struct rlb_client_info  *new_hashtbl;
745         int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
746         int i;
747
748         new_hashtbl = kmalloc(size, GFP_KERNEL);
749         if (!new_hashtbl) {
750                 pr_err("%s: Error: Failed to allocate RLB hash table\n",
751                        bond->dev->name);
752                 return -1;
753         }
754         _lock_rx_hashtbl(bond);
755
756         bond_info->rx_hashtbl = new_hashtbl;
757
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
766         /* register to receive ARPs */
767         bond->recv_probe = rlb_arp_recv;
768
769         return 0;
770 }
771
772 static void rlb_deinitialize(struct bonding *bond)
773 {
774         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
775
776         _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
785 static 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
820 static 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);
830         pkt.type = cpu_to_be16(ETH_P_LOOP);
831
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
844                 skb_reset_mac_header(skb);
845                 skb->network_header = skb->mac_header + ETH_HLEN;
846                 skb->protocol = pkt.type;
847                 skb->priority = TC_PRIO_CONTROL;
848                 skb->dev = slave->dev;
849
850                 if (bond_vlan_used(bond)) {
851                         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) {
864                                 pr_err("%s: Error: failed to insert VLAN tag\n",
865                                        bond->dev->name);
866                                 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  */
878 static 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)) {
893                 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",
895                        dev->master->name, dev->name);
896                 return -EOPNOTSUPP;
897         }
898         return 0;
899 }
900
901 /*
902  * Swap MAC addresses between two slaves.
903  *
904  * Called with RTNL held, and no other locks.
905  *
906  */
907
908 static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
909 {
910         u8 tmp_mac_addr[ETH_ALEN];
911
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
916 }
917
918 /*
919  * Send learning packets after MAC address swap.
920  *
921  * Called with RTNL and no other locks
922  */
923 static 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
929         ASSERT_RTNL();
930
931         /* 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  *
975  * Caller must hold RTNL and no other locks
976  */
977 static 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
982         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);
986
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) {
992                         if (!compare_ether_addr_64bits(slave->perm_hwaddr,
993                                                        tmp_slave->dev->dev_addr)) {
994                                 found = 1;
995                                 break;
996                         }
997                 }
998
999                 if (found) {
1000                         /* locking: needs RTNL and nothing else */
1001                         alb_swap_mac_addr(bond, slave, tmp_slave);
1002                         alb_fasten_mac_swap(bond, slave, tmp_slave);
1003                 }
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
1017  * slave in the bond. This address must be, of course, one of the permanent
1018  * 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  */
1032 static 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          */
1047         if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1048                 bond_for_each_slave(bond, tmp_slave1, i) {
1049                         if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1050                                                        slave->dev->dev_addr)) {
1051                                 found = 1;
1052                                 break;
1053                         }
1054                 }
1055
1056                 if (!found)
1057                         return 0;
1058
1059                 /* 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);
1063         }
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) {
1073                         if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr,
1074                                                        tmp_slave2->dev->dev_addr)) {
1075                                 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) {
1089                         if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1090                                                        bond->dev->dev_addr)) {
1091
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
1101                 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1102                            bond->dev->name, slave->dev->name,
1103                            free_mac_slave->dev->name);
1104
1105         } else if (has_bond_addr) {
1106                 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",
1107                        bond->dev->name, slave->dev->name);
1108                 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  */
1128 static 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) {
1141                 /* 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
1149                 if (res)
1150                         goto unwind;
1151         }
1152
1153         return 0;
1154
1155 unwind:
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
1172 int 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                 }
1189         } else {
1190                 bond->alb_info.rlb_enabled = 0;
1191         }
1192
1193         return 0;
1194 }
1195
1196 void 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
1207 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1208 {
1209         struct bonding *bond = netdev_priv(bond_dev);
1210         struct ethhdr *eth_data;
1211         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1212         struct slave *tx_slave = NULL;
1213         static const __be32 ip_bcast = htonl(0xffffffff);
1214         int hash_size = 0;
1215         int do_tx_balance = 1;
1216         u32 hash_index = 0;
1217         const u8 *hash_start = NULL;
1218         int res = 1;
1219         struct ipv6hdr *ip6hdr;
1220
1221         skb_reset_mac_header(skb);
1222         eth_data = eth_hdr(skb);
1223
1224         /* make sure that the curr_active_slave do not change during tx
1225          */
1226         read_lock(&bond->curr_slave_lock);
1227
1228         switch (ntohs(skb->protocol)) {
1229         case ETH_P_IP: {
1230                 const struct iphdr *iph = ip_hdr(skb);
1231
1232                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) ||
1233                     (iph->daddr == ip_bcast) ||
1234                     (iph->protocol == IPPROTO_IGMP)) {
1235                         do_tx_balance = 0;
1236                         break;
1237                 }
1238                 hash_start = (char *)&(iph->daddr);
1239                 hash_size = sizeof(iph->daddr);
1240         }
1241                 break;
1242         case ETH_P_IPV6:
1243                 /* IPv6 doesn't really use broadcast mac address, but leave
1244                  * that here just in case.
1245                  */
1246                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) {
1247                         do_tx_balance = 0;
1248                         break;
1249                 }
1250
1251                 /* IPv6 uses all-nodes multicast as an equivalent to
1252                  * broadcasts in IPv4.
1253                  */
1254                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1255                         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
1269                 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1270                 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1271                 break;
1272         case ETH_P_IPX:
1273                 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1274                         /* 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
1327         if (res) {
1328                 /* no suitable interface, frame not sent */
1329                 dev_kfree_skb(skb);
1330         }
1331         read_unlock(&bond->curr_slave_lock);
1332
1333         return NETDEV_TX_OK;
1334 }
1335
1336 void bond_alb_monitor(struct work_struct *work)
1337 {
1338         struct bonding *bond = container_of(work, struct bonding,
1339                                             alb_work.work);
1340         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1341         struct slave *slave;
1342         int i;
1343
1344         read_lock(&bond->lock);
1345
1346         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) {
1365                         alb_send_learning_packets(slave, slave->dev->dev_addr);
1366                 }
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) {
1395                 if (bond_info->primary_is_promisc &&
1396                     (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1397
1398                         /*
1399                          * dev_set_promiscuity requires rtnl and
1400                          * nothing else.  Avoid race with bond_close.
1401                          */
1402                         read_unlock(&bond->lock);
1403                         if (!rtnl_trylock()) {
1404                                 read_lock(&bond->lock);
1405                                 goto re_arm;
1406                         }
1407
1408                         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;
1416
1417                         rtnl_unlock();
1418                         read_lock(&bond->lock);
1419                 }
1420
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
1441 re_arm:
1442         queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1443
1444         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  */
1450 int 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          */
1463         read_lock(&bond->lock);
1464
1465         res = alb_handle_addr_collision_on_attach(bond, slave);
1466
1467         read_unlock(&bond->lock);
1468
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
1485 /*
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  */
1491 void 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 */
1506 void 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  *
1537  * 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.
1543  */
1544 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1545         __releases(&bond->curr_slave_lock)
1546         __releases(&bond->lock)
1547         __acquires(&bond->lock)
1548         __acquires(&bond->curr_slave_lock)
1549 {
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) {
1577                         if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr,
1578                                                        bond->dev->dev_addr)) {
1579                                 swap_slave = tmp_slave;
1580                                 break;
1581                         }
1582                 }
1583         }
1584
1585         /*
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
1598         ASSERT_RTNL();
1599
1600         /* 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);
1608         }
1609
1610         if (swap_slave) {
1611                 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1612                 read_lock(&bond->lock);
1613         } else {
1614                 read_lock(&bond->lock);
1615                 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1616         }
1617
1618         write_lock_bh(&bond->curr_slave_lock);
1619 }
1620
1621 /*
1622  * Called with RTNL
1623  */
1624 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1625         __acquires(&bond->lock)
1626         __releases(&bond->lock)
1627 {
1628         struct bonding *bond = netdev_priv(bond_dev);
1629         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) {
1656                 if (!compare_ether_addr_64bits(slave->dev->dev_addr,
1657                                                bond_dev->dev_addr)) {
1658                         swap_slave = slave;
1659                         break;
1660                 }
1661         }
1662
1663         if (swap_slave) {
1664                 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
1665                 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1666         } else {
1667                 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
1668                                        bond->alb_info.rlb_enabled);
1669
1670                 read_lock(&bond->lock);
1671                 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                 }
1676                 read_unlock(&bond->lock);
1677         }
1678
1679         return 0;
1680 }
1681
1682 void 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