bonding: use the correct size for _simple_hash()
[linux-3.10.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         spin_lock_init(&(bond_info->tx_hashtbl_lock));
167
168         new_hashtbl = kzalloc(size, GFP_KERNEL);
169         if (!new_hashtbl) {
170                 pr_err("%s: Error: Failed to allocate TLB hash table\n",
171                        bond->dev->name);
172                 return -1;
173         }
174         _lock_tx_hashtbl(bond);
175
176         bond_info->tx_hashtbl = new_hashtbl;
177
178         for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
179                 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
180         }
181
182         _unlock_tx_hashtbl(bond);
183
184         return 0;
185 }
186
187 /* Must be called only after all slaves have been released */
188 static void tlb_deinitialize(struct bonding *bond)
189 {
190         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
191
192         _lock_tx_hashtbl(bond);
193
194         kfree(bond_info->tx_hashtbl);
195         bond_info->tx_hashtbl = NULL;
196
197         _unlock_tx_hashtbl(bond);
198 }
199
200 static long long compute_gap(struct slave *slave)
201 {
202         return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
203                (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
204 }
205
206 /* Caller must hold bond lock for read */
207 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
208 {
209         struct slave *slave, *least_loaded;
210         long long max_gap;
211         int i;
212
213         least_loaded = NULL;
214         max_gap = LLONG_MIN;
215
216         /* Find the slave with the largest gap */
217         bond_for_each_slave(bond, slave, i) {
218                 if (SLAVE_IS_OK(slave)) {
219                         long long gap = compute_gap(slave);
220
221                         if (max_gap < gap) {
222                                 least_loaded = slave;
223                                 max_gap = gap;
224                         }
225                 }
226         }
227
228         return least_loaded;
229 }
230
231 /* Caller must hold bond lock for read */
232 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
233 {
234         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
235         struct tlb_client_info *hash_table;
236         struct slave *assigned_slave;
237
238         _lock_tx_hashtbl(bond);
239
240         hash_table = bond_info->tx_hashtbl;
241         assigned_slave = hash_table[hash_index].tx_slave;
242         if (!assigned_slave) {
243                 assigned_slave = tlb_get_least_loaded_slave(bond);
244
245                 if (assigned_slave) {
246                         struct tlb_slave_info *slave_info =
247                                 &(SLAVE_TLB_INFO(assigned_slave));
248                         u32 next_index = slave_info->head;
249
250                         hash_table[hash_index].tx_slave = assigned_slave;
251                         hash_table[hash_index].next = next_index;
252                         hash_table[hash_index].prev = TLB_NULL_INDEX;
253
254                         if (next_index != TLB_NULL_INDEX) {
255                                 hash_table[next_index].prev = hash_index;
256                         }
257
258                         slave_info->head = hash_index;
259                         slave_info->load +=
260                                 hash_table[hash_index].load_history;
261                 }
262         }
263
264         if (assigned_slave) {
265                 hash_table[hash_index].tx_bytes += skb_len;
266         }
267
268         _unlock_tx_hashtbl(bond);
269
270         return assigned_slave;
271 }
272
273 /*********************** rlb specific functions ***************************/
274 static inline void _lock_rx_hashtbl(struct bonding *bond)
275 {
276         spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
277 }
278
279 static inline void _unlock_rx_hashtbl(struct bonding *bond)
280 {
281         spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
282 }
283
284 /* when an ARP REPLY is received from a client update its info
285  * in the rx_hashtbl
286  */
287 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
288 {
289         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
290         struct rlb_client_info *client_info;
291         u32 hash_index;
292
293         _lock_rx_hashtbl(bond);
294
295         hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
296         client_info = &(bond_info->rx_hashtbl[hash_index]);
297
298         if ((client_info->assigned) &&
299             (client_info->ip_src == arp->ip_dst) &&
300             (client_info->ip_dst == arp->ip_src) &&
301             (compare_ether_addr_64bits(client_info->mac_dst, arp->mac_src))) {
302                 /* update the clients MAC address */
303                 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
304                 client_info->ntt = 1;
305                 bond_info->rx_ntt = 1;
306         }
307
308         _unlock_rx_hashtbl(bond);
309 }
310
311 static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev)
312 {
313         struct bonding *bond;
314         struct arp_pkt *arp = (struct arp_pkt *)skb->data;
315         int res = NET_RX_DROP;
316
317         while (bond_dev->priv_flags & IFF_802_1Q_VLAN)
318                 bond_dev = vlan_dev_real_dev(bond_dev);
319
320         if (!(bond_dev->priv_flags & IFF_BONDING) ||
321             !(bond_dev->flags & IFF_MASTER))
322                 goto out;
323
324         if (!arp) {
325                 pr_debug("Packet has no ARP data\n");
326                 goto out;
327         }
328
329         skb = skb_share_check(skb, GFP_ATOMIC);
330         if (!skb)
331                 goto out;
332
333         if (!pskb_may_pull(skb, arp_hdr_len(bond_dev)))
334                 goto out;
335
336         if (skb->len < sizeof(struct arp_pkt)) {
337                 pr_debug("Packet is too small to be an ARP\n");
338                 goto out;
339         }
340
341         if (arp->op_code == htons(ARPOP_REPLY)) {
342                 /* update rx hash table for this ARP */
343                 bond = netdev_priv(bond_dev);
344                 rlb_update_entry_from_arp(bond, arp);
345                 pr_debug("Server received an ARP Reply from client\n");
346         }
347
348         res = NET_RX_SUCCESS;
349
350 out:
351         dev_kfree_skb(skb);
352
353         return res;
354 }
355
356 /* Caller must hold bond lock for read */
357 static struct slave *rlb_next_rx_slave(struct bonding *bond)
358 {
359         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
360         struct slave *rx_slave, *slave, *start_at;
361         int i = 0;
362
363         if (bond_info->next_rx_slave) {
364                 start_at = bond_info->next_rx_slave;
365         } else {
366                 start_at = bond->first_slave;
367         }
368
369         rx_slave = NULL;
370
371         bond_for_each_slave_from(bond, slave, i, start_at) {
372                 if (SLAVE_IS_OK(slave)) {
373                         if (!rx_slave) {
374                                 rx_slave = slave;
375                         } else if (slave->speed > rx_slave->speed) {
376                                 rx_slave = slave;
377                         }
378                 }
379         }
380
381         if (rx_slave) {
382                 bond_info->next_rx_slave = rx_slave->next;
383         }
384
385         return rx_slave;
386 }
387
388 /* teach the switch the mac of a disabled slave
389  * on the primary for fault tolerance
390  *
391  * Caller must hold bond->curr_slave_lock for write or bond lock for write
392  */
393 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
394 {
395         if (!bond->curr_active_slave) {
396                 return;
397         }
398
399         if (!bond->alb_info.primary_is_promisc) {
400                 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
401                         bond->alb_info.primary_is_promisc = 1;
402                 else
403                         bond->alb_info.primary_is_promisc = 0;
404         }
405
406         bond->alb_info.rlb_promisc_timeout_counter = 0;
407
408         alb_send_learning_packets(bond->curr_active_slave, addr);
409 }
410
411 /* slave being removed should not be active at this point
412  *
413  * Caller must hold bond lock for read
414  */
415 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
416 {
417         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
418         struct rlb_client_info *rx_hash_table;
419         u32 index, next_index;
420
421         /* clear slave from rx_hashtbl */
422         _lock_rx_hashtbl(bond);
423
424         rx_hash_table = bond_info->rx_hashtbl;
425         index = bond_info->rx_hashtbl_head;
426         for (; index != RLB_NULL_INDEX; index = next_index) {
427                 next_index = rx_hash_table[index].next;
428                 if (rx_hash_table[index].slave == slave) {
429                         struct slave *assigned_slave = rlb_next_rx_slave(bond);
430
431                         if (assigned_slave) {
432                                 rx_hash_table[index].slave = assigned_slave;
433                                 if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst,
434                                                               mac_bcast)) {
435                                         bond_info->rx_hashtbl[index].ntt = 1;
436                                         bond_info->rx_ntt = 1;
437                                         /* A slave has been removed from the
438                                          * table because it is either disabled
439                                          * or being released. We must retry the
440                                          * update to avoid clients from not
441                                          * being updated & disconnecting when
442                                          * there is stress
443                                          */
444                                         bond_info->rlb_update_retry_counter =
445                                                 RLB_UPDATE_RETRY;
446                                 }
447                         } else {  /* there is no active slave */
448                                 rx_hash_table[index].slave = NULL;
449                         }
450                 }
451         }
452
453         _unlock_rx_hashtbl(bond);
454
455         write_lock_bh(&bond->curr_slave_lock);
456
457         if (slave != bond->curr_active_slave) {
458                 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
459         }
460
461         write_unlock_bh(&bond->curr_slave_lock);
462 }
463
464 static void rlb_update_client(struct rlb_client_info *client_info)
465 {
466         int i;
467
468         if (!client_info->slave) {
469                 return;
470         }
471
472         for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
473                 struct sk_buff *skb;
474
475                 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
476                                  client_info->ip_dst,
477                                  client_info->slave->dev,
478                                  client_info->ip_src,
479                                  client_info->mac_dst,
480                                  client_info->slave->dev->dev_addr,
481                                  client_info->mac_dst);
482                 if (!skb) {
483                         pr_err("%s: Error: failed to create an ARP packet\n",
484                                client_info->slave->dev->master->name);
485                         continue;
486                 }
487
488                 skb->dev = client_info->slave->dev;
489
490                 if (client_info->tag) {
491                         skb = vlan_put_tag(skb, client_info->vlan_id);
492                         if (!skb) {
493                                 pr_err("%s: Error: failed to insert VLAN tag\n",
494                                        client_info->slave->dev->master->name);
495                                 continue;
496                         }
497                 }
498
499                 arp_xmit(skb);
500         }
501 }
502
503 /* sends ARP REPLIES that update the clients that need updating */
504 static void rlb_update_rx_clients(struct bonding *bond)
505 {
506         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
507         struct rlb_client_info *client_info;
508         u32 hash_index;
509
510         _lock_rx_hashtbl(bond);
511
512         hash_index = bond_info->rx_hashtbl_head;
513         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
514                 client_info = &(bond_info->rx_hashtbl[hash_index]);
515                 if (client_info->ntt) {
516                         rlb_update_client(client_info);
517                         if (bond_info->rlb_update_retry_counter == 0) {
518                                 client_info->ntt = 0;
519                         }
520                 }
521         }
522
523         /* do not update the entries again until this counter is zero so that
524          * not to confuse the clients.
525          */
526         bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
527
528         _unlock_rx_hashtbl(bond);
529 }
530
531 /* The slave was assigned a new mac address - update the clients */
532 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
533 {
534         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
535         struct rlb_client_info *client_info;
536         int ntt = 0;
537         u32 hash_index;
538
539         _lock_rx_hashtbl(bond);
540
541         hash_index = bond_info->rx_hashtbl_head;
542         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
543                 client_info = &(bond_info->rx_hashtbl[hash_index]);
544
545                 if ((client_info->slave == slave) &&
546                     compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
547                         client_info->ntt = 1;
548                         ntt = 1;
549                 }
550         }
551
552         // update the team's flag only after the whole iteration
553         if (ntt) {
554                 bond_info->rx_ntt = 1;
555                 //fasten the change
556                 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
557         }
558
559         _unlock_rx_hashtbl(bond);
560 }
561
562 /* mark all clients using src_ip to be updated */
563 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
564 {
565         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
566         struct rlb_client_info *client_info;
567         u32 hash_index;
568
569         _lock_rx_hashtbl(bond);
570
571         hash_index = bond_info->rx_hashtbl_head;
572         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
573                 client_info = &(bond_info->rx_hashtbl[hash_index]);
574
575                 if (!client_info->slave) {
576                         pr_err("%s: Error: found a client with no channel in the client's hash table\n",
577                                bond->dev->name);
578                         continue;
579                 }
580                 /*update all clients using this src_ip, that are not assigned
581                  * to the team's address (curr_active_slave) and have a known
582                  * unicast mac address.
583                  */
584                 if ((client_info->ip_src == src_ip) &&
585                     compare_ether_addr_64bits(client_info->slave->dev->dev_addr,
586                            bond->dev->dev_addr) &&
587                     compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
588                         client_info->ntt = 1;
589                         bond_info->rx_ntt = 1;
590                 }
591         }
592
593         _unlock_rx_hashtbl(bond);
594 }
595
596 /* Caller must hold both bond and ptr locks for read */
597 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
598 {
599         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
600         struct arp_pkt *arp = arp_pkt(skb);
601         struct slave *assigned_slave;
602         struct rlb_client_info *client_info;
603         u32 hash_index = 0;
604
605         _lock_rx_hashtbl(bond);
606
607         hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
608         client_info = &(bond_info->rx_hashtbl[hash_index]);
609
610         if (client_info->assigned) {
611                 if ((client_info->ip_src == arp->ip_src) &&
612                     (client_info->ip_dst == arp->ip_dst)) {
613                         /* the entry is already assigned to this client */
614                         if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) {
615                                 /* update mac address from arp */
616                                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
617                         }
618
619                         assigned_slave = client_info->slave;
620                         if (assigned_slave) {
621                                 _unlock_rx_hashtbl(bond);
622                                 return assigned_slave;
623                         }
624                 } else {
625                         /* the entry is already assigned to some other client,
626                          * move the old client to primary (curr_active_slave) so
627                          * that the new client can be assigned to this entry.
628                          */
629                         if (bond->curr_active_slave &&
630                             client_info->slave != bond->curr_active_slave) {
631                                 client_info->slave = bond->curr_active_slave;
632                                 rlb_update_client(client_info);
633                         }
634                 }
635         }
636         /* assign a new slave */
637         assigned_slave = rlb_next_rx_slave(bond);
638
639         if (assigned_slave) {
640                 client_info->ip_src = arp->ip_src;
641                 client_info->ip_dst = arp->ip_dst;
642                 /* arp->mac_dst is broadcast for arp reqeusts.
643                  * will be updated with clients actual unicast mac address
644                  * upon receiving an arp reply.
645                  */
646                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
647                 client_info->slave = assigned_slave;
648
649                 if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
650                         client_info->ntt = 1;
651                         bond->alb_info.rx_ntt = 1;
652                 } else {
653                         client_info->ntt = 0;
654                 }
655
656                 if (bond->vlgrp) {
657                         if (!vlan_get_tag(skb, &client_info->vlan_id))
658                                 client_info->tag = 1;
659                 }
660
661                 if (!client_info->assigned) {
662                         u32 prev_tbl_head = bond_info->rx_hashtbl_head;
663                         bond_info->rx_hashtbl_head = hash_index;
664                         client_info->next = prev_tbl_head;
665                         if (prev_tbl_head != RLB_NULL_INDEX) {
666                                 bond_info->rx_hashtbl[prev_tbl_head].prev =
667                                         hash_index;
668                         }
669                         client_info->assigned = 1;
670                 }
671         }
672
673         _unlock_rx_hashtbl(bond);
674
675         return assigned_slave;
676 }
677
678 /* chooses (and returns) transmit channel for arp reply
679  * does not choose channel for other arp types since they are
680  * sent on the curr_active_slave
681  */
682 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
683 {
684         struct arp_pkt *arp = arp_pkt(skb);
685         struct slave *tx_slave = NULL;
686
687         if (arp->op_code == htons(ARPOP_REPLY)) {
688                 /* the arp must be sent on the selected
689                 * rx channel
690                 */
691                 tx_slave = rlb_choose_channel(skb, bond);
692                 if (tx_slave) {
693                         memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
694                 }
695                 pr_debug("Server sent ARP Reply packet\n");
696         } else if (arp->op_code == htons(ARPOP_REQUEST)) {
697                 /* Create an entry in the rx_hashtbl for this client as a
698                  * place holder.
699                  * When the arp reply is received the entry will be updated
700                  * with the correct unicast address of the client.
701                  */
702                 rlb_choose_channel(skb, bond);
703
704                 /* The ARP relpy packets must be delayed so that
705                  * they can cancel out the influence of the ARP request.
706                  */
707                 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
708
709                 /* arp requests are broadcast and are sent on the primary
710                  * the arp request will collapse all clients on the subnet to
711                  * the primary slave. We must register these clients to be
712                  * updated with their assigned mac.
713                  */
714                 rlb_req_update_subnet_clients(bond, arp->ip_src);
715                 pr_debug("Server sent ARP Request packet\n");
716         }
717
718         return tx_slave;
719 }
720
721 /* Caller must hold bond lock for read */
722 static void rlb_rebalance(struct bonding *bond)
723 {
724         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
725         struct slave *assigned_slave;
726         struct rlb_client_info *client_info;
727         int ntt;
728         u32 hash_index;
729
730         _lock_rx_hashtbl(bond);
731
732         ntt = 0;
733         hash_index = bond_info->rx_hashtbl_head;
734         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
735                 client_info = &(bond_info->rx_hashtbl[hash_index]);
736                 assigned_slave = rlb_next_rx_slave(bond);
737                 if (assigned_slave && (client_info->slave != assigned_slave)) {
738                         client_info->slave = assigned_slave;
739                         client_info->ntt = 1;
740                         ntt = 1;
741                 }
742         }
743
744         /* update the team's flag only after the whole iteration */
745         if (ntt) {
746                 bond_info->rx_ntt = 1;
747         }
748         _unlock_rx_hashtbl(bond);
749 }
750
751 /* Caller must hold rx_hashtbl lock */
752 static void rlb_init_table_entry(struct rlb_client_info *entry)
753 {
754         memset(entry, 0, sizeof(struct rlb_client_info));
755         entry->next = RLB_NULL_INDEX;
756         entry->prev = RLB_NULL_INDEX;
757 }
758
759 static int rlb_initialize(struct bonding *bond)
760 {
761         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
762         struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type);
763         struct rlb_client_info  *new_hashtbl;
764         int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
765         int i;
766
767         spin_lock_init(&(bond_info->rx_hashtbl_lock));
768
769         new_hashtbl = kmalloc(size, GFP_KERNEL);
770         if (!new_hashtbl) {
771                 pr_err("%s: Error: Failed to allocate RLB hash table\n",
772                        bond->dev->name);
773                 return -1;
774         }
775         _lock_rx_hashtbl(bond);
776
777         bond_info->rx_hashtbl = new_hashtbl;
778
779         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
780
781         for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
782                 rlb_init_table_entry(bond_info->rx_hashtbl + i);
783         }
784
785         _unlock_rx_hashtbl(bond);
786
787         /*initialize packet type*/
788         pk_type->type = cpu_to_be16(ETH_P_ARP);
789         pk_type->dev = bond->dev;
790         pk_type->func = rlb_arp_recv;
791
792         /* register to receive ARPs */
793         dev_add_pack(pk_type);
794
795         return 0;
796 }
797
798 static void rlb_deinitialize(struct bonding *bond)
799 {
800         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
801
802         dev_remove_pack(&(bond_info->rlb_pkt_type));
803
804         _lock_rx_hashtbl(bond);
805
806         kfree(bond_info->rx_hashtbl);
807         bond_info->rx_hashtbl = NULL;
808         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
809
810         _unlock_rx_hashtbl(bond);
811 }
812
813 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
814 {
815         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
816         u32 curr_index;
817
818         _lock_rx_hashtbl(bond);
819
820         curr_index = bond_info->rx_hashtbl_head;
821         while (curr_index != RLB_NULL_INDEX) {
822                 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
823                 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
824                 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
825
826                 if (curr->tag && (curr->vlan_id == vlan_id)) {
827                         if (curr_index == bond_info->rx_hashtbl_head) {
828                                 bond_info->rx_hashtbl_head = next_index;
829                         }
830                         if (prev_index != RLB_NULL_INDEX) {
831                                 bond_info->rx_hashtbl[prev_index].next = next_index;
832                         }
833                         if (next_index != RLB_NULL_INDEX) {
834                                 bond_info->rx_hashtbl[next_index].prev = prev_index;
835                         }
836
837                         rlb_init_table_entry(curr);
838                 }
839
840                 curr_index = next_index;
841         }
842
843         _unlock_rx_hashtbl(bond);
844 }
845
846 /*********************** tlb/rlb shared functions *********************/
847
848 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
849 {
850         struct bonding *bond = bond_get_bond_by_slave(slave);
851         struct learning_pkt pkt;
852         int size = sizeof(struct learning_pkt);
853         int i;
854
855         memset(&pkt, 0, size);
856         memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
857         memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
858         pkt.type = cpu_to_be16(ETH_P_LOOP);
859
860         for (i = 0; i < MAX_LP_BURST; i++) {
861                 struct sk_buff *skb;
862                 char *data;
863
864                 skb = dev_alloc_skb(size);
865                 if (!skb) {
866                         return;
867                 }
868
869                 data = skb_put(skb, size);
870                 memcpy(data, &pkt, size);
871
872                 skb_reset_mac_header(skb);
873                 skb->network_header = skb->mac_header + ETH_HLEN;
874                 skb->protocol = pkt.type;
875                 skb->priority = TC_PRIO_CONTROL;
876                 skb->dev = slave->dev;
877
878                 if (bond->vlgrp) {
879                         struct vlan_entry *vlan;
880
881                         vlan = bond_next_vlan(bond,
882                                               bond->alb_info.current_alb_vlan);
883
884                         bond->alb_info.current_alb_vlan = vlan;
885                         if (!vlan) {
886                                 kfree_skb(skb);
887                                 continue;
888                         }
889
890                         skb = vlan_put_tag(skb, vlan->vlan_id);
891                         if (!skb) {
892                                 pr_err("%s: Error: failed to insert VLAN tag\n",
893                                        bond->dev->name);
894                                 continue;
895                         }
896                 }
897
898                 dev_queue_xmit(skb);
899         }
900 }
901
902 /* hw is a boolean parameter that determines whether we should try and
903  * set the hw address of the device as well as the hw address of the
904  * net_device
905  */
906 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
907 {
908         struct net_device *dev = slave->dev;
909         struct sockaddr s_addr;
910
911         if (!hw) {
912                 memcpy(dev->dev_addr, addr, dev->addr_len);
913                 return 0;
914         }
915
916         /* for rlb each slave must have a unique hw mac addresses so that */
917         /* each slave will receive packets destined to a different mac */
918         memcpy(s_addr.sa_data, addr, dev->addr_len);
919         s_addr.sa_family = dev->type;
920         if (dev_set_mac_address(dev, &s_addr)) {
921                 pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
922                        "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
923                        dev->master->name, dev->name);
924                 return -EOPNOTSUPP;
925         }
926         return 0;
927 }
928
929 /*
930  * Swap MAC addresses between two slaves.
931  *
932  * Called with RTNL held, and no other locks.
933  *
934  */
935
936 static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
937 {
938         u8 tmp_mac_addr[ETH_ALEN];
939
940         memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
941         alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
942         alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
943
944 }
945
946 /*
947  * Send learning packets after MAC address swap.
948  *
949  * Called with RTNL and no other locks
950  */
951 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
952                                 struct slave *slave2)
953 {
954         int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
955         struct slave *disabled_slave = NULL;
956
957         ASSERT_RTNL();
958
959         /* fasten the change in the switch */
960         if (SLAVE_IS_OK(slave1)) {
961                 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
962                 if (bond->alb_info.rlb_enabled) {
963                         /* inform the clients that the mac address
964                          * has changed
965                          */
966                         rlb_req_update_slave_clients(bond, slave1);
967                 }
968         } else {
969                 disabled_slave = slave1;
970         }
971
972         if (SLAVE_IS_OK(slave2)) {
973                 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
974                 if (bond->alb_info.rlb_enabled) {
975                         /* inform the clients that the mac address
976                          * has changed
977                          */
978                         rlb_req_update_slave_clients(bond, slave2);
979                 }
980         } else {
981                 disabled_slave = slave2;
982         }
983
984         if (bond->alb_info.rlb_enabled && slaves_state_differ) {
985                 /* A disabled slave was assigned an active mac addr */
986                 rlb_teach_disabled_mac_on_primary(bond,
987                                                   disabled_slave->dev->dev_addr);
988         }
989 }
990
991 /**
992  * alb_change_hw_addr_on_detach
993  * @bond: bonding we're working on
994  * @slave: the slave that was just detached
995  *
996  * We assume that @slave was already detached from the slave list.
997  *
998  * If @slave's permanent hw address is different both from its current
999  * address and from @bond's address, then somewhere in the bond there's
1000  * a slave that has @slave's permanet address as its current address.
1001  * We'll make sure that that slave no longer uses @slave's permanent address.
1002  *
1003  * Caller must hold RTNL and no other locks
1004  */
1005 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1006 {
1007         int perm_curr_diff;
1008         int perm_bond_diff;
1009
1010         perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
1011                                                    slave->dev->dev_addr);
1012         perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
1013                                                    bond->dev->dev_addr);
1014
1015         if (perm_curr_diff && perm_bond_diff) {
1016                 struct slave *tmp_slave;
1017                 int i, found = 0;
1018
1019                 bond_for_each_slave(bond, tmp_slave, i) {
1020                         if (!compare_ether_addr_64bits(slave->perm_hwaddr,
1021                                                        tmp_slave->dev->dev_addr)) {
1022                                 found = 1;
1023                                 break;
1024                         }
1025                 }
1026
1027                 if (found) {
1028                         /* locking: needs RTNL and nothing else */
1029                         alb_swap_mac_addr(bond, slave, tmp_slave);
1030                         alb_fasten_mac_swap(bond, slave, tmp_slave);
1031                 }
1032         }
1033 }
1034
1035 /**
1036  * alb_handle_addr_collision_on_attach
1037  * @bond: bonding we're working on
1038  * @slave: the slave that was just attached
1039  *
1040  * checks uniqueness of slave's mac address and handles the case the
1041  * new slave uses the bonds mac address.
1042  *
1043  * If the permanent hw address of @slave is @bond's hw address, we need to
1044  * find a different hw address to give @slave, that isn't in use by any other
1045  * slave in the bond. This address must be, of course, one of the premanent
1046  * addresses of the other slaves.
1047  *
1048  * We go over the slave list, and for each slave there we compare its
1049  * permanent hw address with the current address of all the other slaves.
1050  * If no match was found, then we've found a slave with a permanent address
1051  * that isn't used by any other slave in the bond, so we can assign it to
1052  * @slave.
1053  *
1054  * assumption: this function is called before @slave is attached to the
1055  *             bond slave list.
1056  *
1057  * caller must hold the bond lock for write since the mac addresses are compared
1058  * and may be swapped.
1059  */
1060 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1061 {
1062         struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1063         struct slave *has_bond_addr = bond->curr_active_slave;
1064         int i, j, found = 0;
1065
1066         if (bond->slave_cnt == 0) {
1067                 /* this is the first slave */
1068                 return 0;
1069         }
1070
1071         /* if slave's mac address differs from bond's mac address
1072          * check uniqueness of slave's mac address against the other
1073          * slaves in the bond.
1074          */
1075         if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1076                 bond_for_each_slave(bond, tmp_slave1, i) {
1077                         if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1078                                                        slave->dev->dev_addr)) {
1079                                 found = 1;
1080                                 break;
1081                         }
1082                 }
1083
1084                 if (!found)
1085                         return 0;
1086
1087                 /* Try setting slave mac to bond address and fall-through
1088                    to code handling that situation below... */
1089                 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1090                                        bond->alb_info.rlb_enabled);
1091         }
1092
1093         /* The slave's address is equal to the address of the bond.
1094          * Search for a spare address in the bond for this slave.
1095          */
1096         free_mac_slave = NULL;
1097
1098         bond_for_each_slave(bond, tmp_slave1, i) {
1099                 found = 0;
1100                 bond_for_each_slave(bond, tmp_slave2, j) {
1101                         if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr,
1102                                                        tmp_slave2->dev->dev_addr)) {
1103                                 found = 1;
1104                                 break;
1105                         }
1106                 }
1107
1108                 if (!found) {
1109                         /* no slave has tmp_slave1's perm addr
1110                          * as its curr addr
1111                          */
1112                         free_mac_slave = tmp_slave1;
1113                         break;
1114                 }
1115
1116                 if (!has_bond_addr) {
1117                         if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1118                                                        bond->dev->dev_addr)) {
1119
1120                                 has_bond_addr = tmp_slave1;
1121                         }
1122                 }
1123         }
1124
1125         if (free_mac_slave) {
1126                 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1127                                        bond->alb_info.rlb_enabled);
1128
1129                 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1130                            bond->dev->name, slave->dev->name,
1131                            free_mac_slave->dev->name);
1132
1133         } else if (has_bond_addr) {
1134                 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",
1135                        bond->dev->name, slave->dev->name);
1136                 return -EFAULT;
1137         }
1138
1139         return 0;
1140 }
1141
1142 /**
1143  * alb_set_mac_address
1144  * @bond:
1145  * @addr:
1146  *
1147  * In TLB mode all slaves are configured to the bond's hw address, but set
1148  * their dev_addr field to different addresses (based on their permanent hw
1149  * addresses).
1150  *
1151  * For each slave, this function sets the interface to the new address and then
1152  * changes its dev_addr field to its previous value.
1153  *
1154  * Unwinding assumes bond's mac address has not yet changed.
1155  */
1156 static int alb_set_mac_address(struct bonding *bond, void *addr)
1157 {
1158         struct sockaddr sa;
1159         struct slave *slave, *stop_at;
1160         char tmp_addr[ETH_ALEN];
1161         int res;
1162         int i;
1163
1164         if (bond->alb_info.rlb_enabled) {
1165                 return 0;
1166         }
1167
1168         bond_for_each_slave(bond, slave, i) {
1169                 /* save net_device's current hw address */
1170                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1171
1172                 res = dev_set_mac_address(slave->dev, addr);
1173
1174                 /* restore net_device's hw address */
1175                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1176
1177                 if (res)
1178                         goto unwind;
1179         }
1180
1181         return 0;
1182
1183 unwind:
1184         memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1185         sa.sa_family = bond->dev->type;
1186
1187         /* unwind from head to the slave that failed */
1188         stop_at = slave;
1189         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1190                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1191                 dev_set_mac_address(slave->dev, &sa);
1192                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1193         }
1194
1195         return res;
1196 }
1197
1198 /************************ exported alb funcions ************************/
1199
1200 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1201 {
1202         int res;
1203
1204         res = tlb_initialize(bond);
1205         if (res) {
1206                 return res;
1207         }
1208
1209         if (rlb_enabled) {
1210                 bond->alb_info.rlb_enabled = 1;
1211                 /* initialize rlb */
1212                 res = rlb_initialize(bond);
1213                 if (res) {
1214                         tlb_deinitialize(bond);
1215                         return res;
1216                 }
1217         } else {
1218                 bond->alb_info.rlb_enabled = 0;
1219         }
1220
1221         return 0;
1222 }
1223
1224 void bond_alb_deinitialize(struct bonding *bond)
1225 {
1226         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1227
1228         tlb_deinitialize(bond);
1229
1230         if (bond_info->rlb_enabled) {
1231                 rlb_deinitialize(bond);
1232         }
1233 }
1234
1235 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1236 {
1237         struct bonding *bond = netdev_priv(bond_dev);
1238         struct ethhdr *eth_data;
1239         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1240         struct slave *tx_slave = NULL;
1241         static const __be32 ip_bcast = htonl(0xffffffff);
1242         int hash_size = 0;
1243         int do_tx_balance = 1;
1244         u32 hash_index = 0;
1245         const u8 *hash_start = NULL;
1246         int res = 1;
1247         struct ipv6hdr *ip6hdr;
1248
1249         skb_reset_mac_header(skb);
1250         eth_data = eth_hdr(skb);
1251
1252         /* make sure that the curr_active_slave and the slaves list do
1253          * not change during tx
1254          */
1255         read_lock(&bond->lock);
1256         read_lock(&bond->curr_slave_lock);
1257
1258         if (!BOND_IS_OK(bond)) {
1259                 goto out;
1260         }
1261
1262         switch (ntohs(skb->protocol)) {
1263         case ETH_P_IP: {
1264                 const struct iphdr *iph = ip_hdr(skb);
1265
1266                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) ||
1267                     (iph->daddr == ip_bcast) ||
1268                     (iph->protocol == IPPROTO_IGMP)) {
1269                         do_tx_balance = 0;
1270                         break;
1271                 }
1272                 hash_start = (char *)&(iph->daddr);
1273                 hash_size = sizeof(iph->daddr);
1274         }
1275                 break;
1276         case ETH_P_IPV6:
1277                 /* IPv6 doesn't really use broadcast mac address, but leave
1278                  * that here just in case.
1279                  */
1280                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) {
1281                         do_tx_balance = 0;
1282                         break;
1283                 }
1284
1285                 /* IPv6 uses all-nodes multicast as an equivalent to
1286                  * broadcasts in IPv4.
1287                  */
1288                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1289                         do_tx_balance = 0;
1290                         break;
1291                 }
1292
1293                 /* Additianally, DAD probes should not be tx-balanced as that
1294                  * will lead to false positives for duplicate addresses and
1295                  * prevent address configuration from working.
1296                  */
1297                 ip6hdr = ipv6_hdr(skb);
1298                 if (ipv6_addr_any(&ip6hdr->saddr)) {
1299                         do_tx_balance = 0;
1300                         break;
1301                 }
1302
1303                 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1304                 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1305                 break;
1306         case ETH_P_IPX:
1307                 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1308                         /* something is wrong with this packet */
1309                         do_tx_balance = 0;
1310                         break;
1311                 }
1312
1313                 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1314                         /* The only protocol worth balancing in
1315                          * this family since it has an "ARP" like
1316                          * mechanism
1317                          */
1318                         do_tx_balance = 0;
1319                         break;
1320                 }
1321
1322                 hash_start = (char*)eth_data->h_dest;
1323                 hash_size = ETH_ALEN;
1324                 break;
1325         case ETH_P_ARP:
1326                 do_tx_balance = 0;
1327                 if (bond_info->rlb_enabled) {
1328                         tx_slave = rlb_arp_xmit(skb, bond);
1329                 }
1330                 break;
1331         default:
1332                 do_tx_balance = 0;
1333                 break;
1334         }
1335
1336         if (do_tx_balance) {
1337                 hash_index = _simple_hash(hash_start, hash_size);
1338                 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1339         }
1340
1341         if (!tx_slave) {
1342                 /* unbalanced or unassigned, send through primary */
1343                 tx_slave = bond->curr_active_slave;
1344                 bond_info->unbalanced_load += skb->len;
1345         }
1346
1347         if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1348                 if (tx_slave != bond->curr_active_slave) {
1349                         memcpy(eth_data->h_source,
1350                                tx_slave->dev->dev_addr,
1351                                ETH_ALEN);
1352                 }
1353
1354                 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1355         } else {
1356                 if (tx_slave) {
1357                         tlb_clear_slave(bond, tx_slave, 0);
1358                 }
1359         }
1360
1361 out:
1362         if (res) {
1363                 /* no suitable interface, frame not sent */
1364                 dev_kfree_skb(skb);
1365         }
1366         read_unlock(&bond->curr_slave_lock);
1367         read_unlock(&bond->lock);
1368         return NETDEV_TX_OK;
1369 }
1370
1371 void bond_alb_monitor(struct work_struct *work)
1372 {
1373         struct bonding *bond = container_of(work, struct bonding,
1374                                             alb_work.work);
1375         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1376         struct slave *slave;
1377         int i;
1378
1379         read_lock(&bond->lock);
1380
1381         if (bond->kill_timers) {
1382                 goto out;
1383         }
1384
1385         if (bond->slave_cnt == 0) {
1386                 bond_info->tx_rebalance_counter = 0;
1387                 bond_info->lp_counter = 0;
1388                 goto re_arm;
1389         }
1390
1391         bond_info->tx_rebalance_counter++;
1392         bond_info->lp_counter++;
1393
1394         /* send learning packets */
1395         if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1396                 /* change of curr_active_slave involves swapping of mac addresses.
1397                  * in order to avoid this swapping from happening while
1398                  * sending the learning packets, the curr_slave_lock must be held for
1399                  * read.
1400                  */
1401                 read_lock(&bond->curr_slave_lock);
1402
1403                 bond_for_each_slave(bond, slave, i) {
1404                         alb_send_learning_packets(slave, slave->dev->dev_addr);
1405                 }
1406
1407                 read_unlock(&bond->curr_slave_lock);
1408
1409                 bond_info->lp_counter = 0;
1410         }
1411
1412         /* rebalance tx traffic */
1413         if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1414
1415                 read_lock(&bond->curr_slave_lock);
1416
1417                 bond_for_each_slave(bond, slave, i) {
1418                         tlb_clear_slave(bond, slave, 1);
1419                         if (slave == bond->curr_active_slave) {
1420                                 SLAVE_TLB_INFO(slave).load =
1421                                         bond_info->unbalanced_load /
1422                                                 BOND_TLB_REBALANCE_INTERVAL;
1423                                 bond_info->unbalanced_load = 0;
1424                         }
1425                 }
1426
1427                 read_unlock(&bond->curr_slave_lock);
1428
1429                 bond_info->tx_rebalance_counter = 0;
1430         }
1431
1432         /* handle rlb stuff */
1433         if (bond_info->rlb_enabled) {
1434                 if (bond_info->primary_is_promisc &&
1435                     (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1436
1437                         /*
1438                          * dev_set_promiscuity requires rtnl and
1439                          * nothing else.
1440                          */
1441                         read_unlock(&bond->lock);
1442                         rtnl_lock();
1443
1444                         bond_info->rlb_promisc_timeout_counter = 0;
1445
1446                         /* If the primary was set to promiscuous mode
1447                          * because a slave was disabled then
1448                          * it can now leave promiscuous mode.
1449                          */
1450                         dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1451                         bond_info->primary_is_promisc = 0;
1452
1453                         rtnl_unlock();
1454                         read_lock(&bond->lock);
1455                 }
1456
1457                 if (bond_info->rlb_rebalance) {
1458                         bond_info->rlb_rebalance = 0;
1459                         rlb_rebalance(bond);
1460                 }
1461
1462                 /* check if clients need updating */
1463                 if (bond_info->rx_ntt) {
1464                         if (bond_info->rlb_update_delay_counter) {
1465                                 --bond_info->rlb_update_delay_counter;
1466                         } else {
1467                                 rlb_update_rx_clients(bond);
1468                                 if (bond_info->rlb_update_retry_counter) {
1469                                         --bond_info->rlb_update_retry_counter;
1470                                 } else {
1471                                         bond_info->rx_ntt = 0;
1472                                 }
1473                         }
1474                 }
1475         }
1476
1477 re_arm:
1478         queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1479 out:
1480         read_unlock(&bond->lock);
1481 }
1482
1483 /* assumption: called before the slave is attached to the bond
1484  * and not locked by the bond lock
1485  */
1486 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1487 {
1488         int res;
1489
1490         res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1491                                      bond->alb_info.rlb_enabled);
1492         if (res) {
1493                 return res;
1494         }
1495
1496         /* caller must hold the bond lock for write since the mac addresses
1497          * are compared and may be swapped.
1498          */
1499         read_lock(&bond->lock);
1500
1501         res = alb_handle_addr_collision_on_attach(bond, slave);
1502
1503         read_unlock(&bond->lock);
1504
1505         if (res) {
1506                 return res;
1507         }
1508
1509         tlb_init_slave(slave);
1510
1511         /* order a rebalance ASAP */
1512         bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1513
1514         if (bond->alb_info.rlb_enabled) {
1515                 bond->alb_info.rlb_rebalance = 1;
1516         }
1517
1518         return 0;
1519 }
1520
1521 /*
1522  * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1523  * if necessary.
1524  *
1525  * Caller must hold RTNL and no other locks
1526  */
1527 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1528 {
1529         if (bond->slave_cnt > 1) {
1530                 alb_change_hw_addr_on_detach(bond, slave);
1531         }
1532
1533         tlb_clear_slave(bond, slave, 0);
1534
1535         if (bond->alb_info.rlb_enabled) {
1536                 bond->alb_info.next_rx_slave = NULL;
1537                 rlb_clear_slave(bond, slave);
1538         }
1539 }
1540
1541 /* Caller must hold bond lock for read */
1542 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1543 {
1544         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1545
1546         if (link == BOND_LINK_DOWN) {
1547                 tlb_clear_slave(bond, slave, 0);
1548                 if (bond->alb_info.rlb_enabled) {
1549                         rlb_clear_slave(bond, slave);
1550                 }
1551         } else if (link == BOND_LINK_UP) {
1552                 /* order a rebalance ASAP */
1553                 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1554                 if (bond->alb_info.rlb_enabled) {
1555                         bond->alb_info.rlb_rebalance = 1;
1556                         /* If the updelay module parameter is smaller than the
1557                          * forwarding delay of the switch the rebalance will
1558                          * not work because the rebalance arp replies will
1559                          * not be forwarded to the clients..
1560                          */
1561                 }
1562         }
1563 }
1564
1565 /**
1566  * bond_alb_handle_active_change - assign new curr_active_slave
1567  * @bond: our bonding struct
1568  * @new_slave: new slave to assign
1569  *
1570  * Set the bond->curr_active_slave to @new_slave and handle
1571  * mac address swapping and promiscuity changes as needed.
1572  *
1573  * If new_slave is NULL, caller must hold curr_slave_lock or
1574  * bond->lock for write.
1575  *
1576  * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1577  * read and curr_slave_lock for write.  Processing here may sleep, so
1578  * no other locks may be held.
1579  */
1580 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1581         __releases(&bond->curr_slave_lock)
1582         __releases(&bond->lock)
1583         __acquires(&bond->lock)
1584         __acquires(&bond->curr_slave_lock)
1585 {
1586         struct slave *swap_slave;
1587         int i;
1588
1589         if (bond->curr_active_slave == new_slave) {
1590                 return;
1591         }
1592
1593         if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1594                 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1595                 bond->alb_info.primary_is_promisc = 0;
1596                 bond->alb_info.rlb_promisc_timeout_counter = 0;
1597         }
1598
1599         swap_slave = bond->curr_active_slave;
1600         bond->curr_active_slave = new_slave;
1601
1602         if (!new_slave || (bond->slave_cnt == 0)) {
1603                 return;
1604         }
1605
1606         /* set the new curr_active_slave to the bonds mac address
1607          * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1608          */
1609         if (!swap_slave) {
1610                 struct slave *tmp_slave;
1611                 /* find slave that is holding the bond's mac address */
1612                 bond_for_each_slave(bond, tmp_slave, i) {
1613                         if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr,
1614                                                        bond->dev->dev_addr)) {
1615                                 swap_slave = tmp_slave;
1616                                 break;
1617                         }
1618                 }
1619         }
1620
1621         /*
1622          * Arrange for swap_slave and new_slave to temporarily be
1623          * ignored so we can mess with their MAC addresses without
1624          * fear of interference from transmit activity.
1625          */
1626         if (swap_slave) {
1627                 tlb_clear_slave(bond, swap_slave, 1);
1628         }
1629         tlb_clear_slave(bond, new_slave, 1);
1630
1631         write_unlock_bh(&bond->curr_slave_lock);
1632         read_unlock(&bond->lock);
1633
1634         ASSERT_RTNL();
1635
1636         /* curr_active_slave must be set before calling alb_swap_mac_addr */
1637         if (swap_slave) {
1638                 /* swap mac address */
1639                 alb_swap_mac_addr(bond, swap_slave, new_slave);
1640         } else {
1641                 /* set the new_slave to the bond mac address */
1642                 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1643                                        bond->alb_info.rlb_enabled);
1644         }
1645
1646         if (swap_slave) {
1647                 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1648                 read_lock(&bond->lock);
1649         } else {
1650                 read_lock(&bond->lock);
1651                 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1652         }
1653
1654         write_lock_bh(&bond->curr_slave_lock);
1655 }
1656
1657 /*
1658  * Called with RTNL
1659  */
1660 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1661         __acquires(&bond->lock)
1662         __releases(&bond->lock)
1663 {
1664         struct bonding *bond = netdev_priv(bond_dev);
1665         struct sockaddr *sa = addr;
1666         struct slave *slave, *swap_slave;
1667         int res;
1668         int i;
1669
1670         if (!is_valid_ether_addr(sa->sa_data)) {
1671                 return -EADDRNOTAVAIL;
1672         }
1673
1674         res = alb_set_mac_address(bond, addr);
1675         if (res) {
1676                 return res;
1677         }
1678
1679         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1680
1681         /* If there is no curr_active_slave there is nothing else to do.
1682          * Otherwise we'll need to pass the new address to it and handle
1683          * duplications.
1684          */
1685         if (!bond->curr_active_slave) {
1686                 return 0;
1687         }
1688
1689         swap_slave = NULL;
1690
1691         bond_for_each_slave(bond, slave, i) {
1692                 if (!compare_ether_addr_64bits(slave->dev->dev_addr,
1693                                                bond_dev->dev_addr)) {
1694                         swap_slave = slave;
1695                         break;
1696                 }
1697         }
1698
1699         if (swap_slave) {
1700                 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
1701                 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1702         } else {
1703                 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
1704                                        bond->alb_info.rlb_enabled);
1705
1706                 read_lock(&bond->lock);
1707                 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1708                 if (bond->alb_info.rlb_enabled) {
1709                         /* inform clients mac address has changed */
1710                         rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1711                 }
1712                 read_unlock(&bond->lock);
1713         }
1714
1715         return 0;
1716 }
1717
1718 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1719 {
1720         if (bond->alb_info.current_alb_vlan &&
1721             (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1722                 bond->alb_info.current_alb_vlan = NULL;
1723         }
1724
1725         if (bond->alb_info.rlb_enabled) {
1726                 rlb_clear_vlan(bond, vlan_id);
1727         }
1728 }
1729