Merge branches 'topic/fix/misc' and 'topic/fix/asoc' into for-linus
[linux-2.6] / 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 BONDING_DEBUG 1
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 #define ALB_TIMER_TICKS_PER_SEC     10  /* should be a divisor of HZ */
48 #define BOND_TLB_REBALANCE_INTERVAL 10  /* In seconds, periodic re-balancing.
49                                          * Used for division - never set
50                                          * to zero !!!
51                                          */
52 #define BOND_ALB_LP_INTERVAL        1   /* In seconds, periodic send of
53                                          * learning packets to the switch
54                                          */
55
56 #define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \
57                                   * ALB_TIMER_TICKS_PER_SEC)
58
59 #define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \
60                            * ALB_TIMER_TICKS_PER_SEC)
61
62 #define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table.
63                                  * Note that this value MUST NOT be smaller
64                                  * because the key hash table is BYTE wide !
65                                  */
66
67
68 #define TLB_NULL_INDEX          0xffffffff
69 #define MAX_LP_BURST            3
70
71 /* rlb defs */
72 #define RLB_HASH_TABLE_SIZE     256
73 #define RLB_NULL_INDEX          0xffffffff
74 #define RLB_UPDATE_DELAY        2*ALB_TIMER_TICKS_PER_SEC /* 2 seconds */
75 #define RLB_ARP_BURST_SIZE      2
76 #define RLB_UPDATE_RETRY        3       /* 3-ticks - must be smaller than the rlb
77                                          * rebalance interval (5 min).
78                                          */
79 /* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is
80  * promiscuous after failover
81  */
82 #define RLB_PROMISC_TIMEOUT     10*ALB_TIMER_TICKS_PER_SEC
83
84 static const u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
85 static const u8 mac_v6_allmcast[ETH_ALEN] = {0x33,0x33,0x00,0x00,0x00,0x01};
86 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
87
88 #pragma pack(1)
89 struct learning_pkt {
90         u8 mac_dst[ETH_ALEN];
91         u8 mac_src[ETH_ALEN];
92         __be16 type;
93         u8 padding[ETH_ZLEN - ETH_HLEN];
94 };
95
96 struct arp_pkt {
97         __be16  hw_addr_space;
98         __be16  prot_addr_space;
99         u8      hw_addr_len;
100         u8      prot_addr_len;
101         __be16  op_code;
102         u8      mac_src[ETH_ALEN];      /* sender hardware address */
103         __be32  ip_src;                 /* sender IP address */
104         u8      mac_dst[ETH_ALEN];      /* target hardware address */
105         __be32  ip_dst;                 /* target IP address */
106 };
107 #pragma pack()
108
109 static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
110 {
111         return (struct arp_pkt *)skb_network_header(skb);
112 }
113
114 /* Forward declaration */
115 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
116
117 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
118 {
119         int i;
120         u8 hash = 0;
121
122         for (i = 0; i < hash_size; i++) {
123                 hash ^= hash_start[i];
124         }
125
126         return hash;
127 }
128
129 /*********************** tlb specific functions ***************************/
130
131 static inline void _lock_tx_hashtbl(struct bonding *bond)
132 {
133         spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
134 }
135
136 static inline void _unlock_tx_hashtbl(struct bonding *bond)
137 {
138         spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
139 }
140
141 /* Caller must hold tx_hashtbl lock */
142 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
143 {
144         if (save_load) {
145                 entry->load_history = 1 + entry->tx_bytes /
146                                       BOND_TLB_REBALANCE_INTERVAL;
147                 entry->tx_bytes = 0;
148         }
149
150         entry->tx_slave = NULL;
151         entry->next = TLB_NULL_INDEX;
152         entry->prev = TLB_NULL_INDEX;
153 }
154
155 static inline void tlb_init_slave(struct slave *slave)
156 {
157         SLAVE_TLB_INFO(slave).load = 0;
158         SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
159 }
160
161 /* Caller must hold bond lock for read */
162 static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
163 {
164         struct tlb_client_info *tx_hash_table;
165         u32 index;
166
167         _lock_tx_hashtbl(bond);
168
169         /* clear slave from tx_hashtbl */
170         tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
171
172         index = SLAVE_TLB_INFO(slave).head;
173         while (index != TLB_NULL_INDEX) {
174                 u32 next_index = tx_hash_table[index].next;
175                 tlb_init_table_entry(&tx_hash_table[index], save_load);
176                 index = next_index;
177         }
178
179         tlb_init_slave(slave);
180
181         _unlock_tx_hashtbl(bond);
182 }
183
184 /* Must be called before starting the monitor timer */
185 static int tlb_initialize(struct bonding *bond)
186 {
187         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
188         int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
189         struct tlb_client_info *new_hashtbl;
190         int i;
191
192         spin_lock_init(&(bond_info->tx_hashtbl_lock));
193
194         new_hashtbl = kzalloc(size, GFP_KERNEL);
195         if (!new_hashtbl) {
196                 printk(KERN_ERR DRV_NAME
197                        ": %s: Error: Failed to allocate TLB hash table\n",
198                        bond->dev->name);
199                 return -1;
200         }
201         _lock_tx_hashtbl(bond);
202
203         bond_info->tx_hashtbl = new_hashtbl;
204
205         for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
206                 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
207         }
208
209         _unlock_tx_hashtbl(bond);
210
211         return 0;
212 }
213
214 /* Must be called only after all slaves have been released */
215 static void tlb_deinitialize(struct bonding *bond)
216 {
217         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
218
219         _lock_tx_hashtbl(bond);
220
221         kfree(bond_info->tx_hashtbl);
222         bond_info->tx_hashtbl = NULL;
223
224         _unlock_tx_hashtbl(bond);
225 }
226
227 /* Caller must hold bond lock for read */
228 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
229 {
230         struct slave *slave, *least_loaded;
231         s64 max_gap;
232         int i, found = 0;
233
234         /* Find the first enabled slave */
235         bond_for_each_slave(bond, slave, i) {
236                 if (SLAVE_IS_OK(slave)) {
237                         found = 1;
238                         break;
239                 }
240         }
241
242         if (!found) {
243                 return NULL;
244         }
245
246         least_loaded = slave;
247         max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */
248                         (s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
249
250         /* Find the slave with the largest gap */
251         bond_for_each_slave_from(bond, slave, i, least_loaded) {
252                 if (SLAVE_IS_OK(slave)) {
253                         s64 gap = (s64)(slave->speed << 20) -
254                                         (s64)(SLAVE_TLB_INFO(slave).load << 3);
255                         if (max_gap < gap) {
256                                 least_loaded = slave;
257                                 max_gap = gap;
258                         }
259                 }
260         }
261
262         return least_loaded;
263 }
264
265 /* Caller must hold bond lock for read */
266 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
267 {
268         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
269         struct tlb_client_info *hash_table;
270         struct slave *assigned_slave;
271
272         _lock_tx_hashtbl(bond);
273
274         hash_table = bond_info->tx_hashtbl;
275         assigned_slave = hash_table[hash_index].tx_slave;
276         if (!assigned_slave) {
277                 assigned_slave = tlb_get_least_loaded_slave(bond);
278
279                 if (assigned_slave) {
280                         struct tlb_slave_info *slave_info =
281                                 &(SLAVE_TLB_INFO(assigned_slave));
282                         u32 next_index = slave_info->head;
283
284                         hash_table[hash_index].tx_slave = assigned_slave;
285                         hash_table[hash_index].next = next_index;
286                         hash_table[hash_index].prev = TLB_NULL_INDEX;
287
288                         if (next_index != TLB_NULL_INDEX) {
289                                 hash_table[next_index].prev = hash_index;
290                         }
291
292                         slave_info->head = hash_index;
293                         slave_info->load +=
294                                 hash_table[hash_index].load_history;
295                 }
296         }
297
298         if (assigned_slave) {
299                 hash_table[hash_index].tx_bytes += skb_len;
300         }
301
302         _unlock_tx_hashtbl(bond);
303
304         return assigned_slave;
305 }
306
307 /*********************** rlb specific functions ***************************/
308 static inline void _lock_rx_hashtbl(struct bonding *bond)
309 {
310         spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
311 }
312
313 static inline void _unlock_rx_hashtbl(struct bonding *bond)
314 {
315         spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
316 }
317
318 /* when an ARP REPLY is received from a client update its info
319  * in the rx_hashtbl
320  */
321 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
322 {
323         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
324         struct rlb_client_info *client_info;
325         u32 hash_index;
326
327         _lock_rx_hashtbl(bond);
328
329         hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
330         client_info = &(bond_info->rx_hashtbl[hash_index]);
331
332         if ((client_info->assigned) &&
333             (client_info->ip_src == arp->ip_dst) &&
334             (client_info->ip_dst == arp->ip_src)) {
335                 /* update the clients MAC address */
336                 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
337                 client_info->ntt = 1;
338                 bond_info->rx_ntt = 1;
339         }
340
341         _unlock_rx_hashtbl(bond);
342 }
343
344 static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev)
345 {
346         struct bonding *bond = bond_dev->priv;
347         struct arp_pkt *arp = (struct arp_pkt *)skb->data;
348         int res = NET_RX_DROP;
349
350         if (dev_net(bond_dev) != &init_net)
351                 goto out;
352
353         if (!(bond_dev->flags & IFF_MASTER))
354                 goto out;
355
356         if (!arp) {
357                 dprintk("Packet has no ARP data\n");
358                 goto out;
359         }
360
361         if (skb->len < sizeof(struct arp_pkt)) {
362                 dprintk("Packet is too small to be an ARP\n");
363                 goto out;
364         }
365
366         if (arp->op_code == htons(ARPOP_REPLY)) {
367                 /* update rx hash table for this ARP */
368                 rlb_update_entry_from_arp(bond, arp);
369                 dprintk("Server received an ARP Reply from client\n");
370         }
371
372         res = NET_RX_SUCCESS;
373
374 out:
375         dev_kfree_skb(skb);
376
377         return res;
378 }
379
380 /* Caller must hold bond lock for read */
381 static struct slave *rlb_next_rx_slave(struct bonding *bond)
382 {
383         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
384         struct slave *rx_slave, *slave, *start_at;
385         int i = 0;
386
387         if (bond_info->next_rx_slave) {
388                 start_at = bond_info->next_rx_slave;
389         } else {
390                 start_at = bond->first_slave;
391         }
392
393         rx_slave = NULL;
394
395         bond_for_each_slave_from(bond, slave, i, start_at) {
396                 if (SLAVE_IS_OK(slave)) {
397                         if (!rx_slave) {
398                                 rx_slave = slave;
399                         } else if (slave->speed > rx_slave->speed) {
400                                 rx_slave = slave;
401                         }
402                 }
403         }
404
405         if (rx_slave) {
406                 bond_info->next_rx_slave = rx_slave->next;
407         }
408
409         return rx_slave;
410 }
411
412 /* teach the switch the mac of a disabled slave
413  * on the primary for fault tolerance
414  *
415  * Caller must hold bond->curr_slave_lock for write or bond lock for write
416  */
417 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
418 {
419         if (!bond->curr_active_slave) {
420                 return;
421         }
422
423         if (!bond->alb_info.primary_is_promisc) {
424                 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
425                         bond->alb_info.primary_is_promisc = 1;
426                 else
427                         bond->alb_info.primary_is_promisc = 0;
428         }
429
430         bond->alb_info.rlb_promisc_timeout_counter = 0;
431
432         alb_send_learning_packets(bond->curr_active_slave, addr);
433 }
434
435 /* slave being removed should not be active at this point
436  *
437  * Caller must hold bond lock for read
438  */
439 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
440 {
441         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
442         struct rlb_client_info *rx_hash_table;
443         u32 index, next_index;
444
445         /* clear slave from rx_hashtbl */
446         _lock_rx_hashtbl(bond);
447
448         rx_hash_table = bond_info->rx_hashtbl;
449         index = bond_info->rx_hashtbl_head;
450         for (; index != RLB_NULL_INDEX; index = next_index) {
451                 next_index = rx_hash_table[index].next;
452                 if (rx_hash_table[index].slave == slave) {
453                         struct slave *assigned_slave = rlb_next_rx_slave(bond);
454
455                         if (assigned_slave) {
456                                 rx_hash_table[index].slave = assigned_slave;
457                                 if (memcmp(rx_hash_table[index].mac_dst,
458                                            mac_bcast, ETH_ALEN)) {
459                                         bond_info->rx_hashtbl[index].ntt = 1;
460                                         bond_info->rx_ntt = 1;
461                                         /* A slave has been removed from the
462                                          * table because it is either disabled
463                                          * or being released. We must retry the
464                                          * update to avoid clients from not
465                                          * being updated & disconnecting when
466                                          * there is stress
467                                          */
468                                         bond_info->rlb_update_retry_counter =
469                                                 RLB_UPDATE_RETRY;
470                                 }
471                         } else {  /* there is no active slave */
472                                 rx_hash_table[index].slave = NULL;
473                         }
474                 }
475         }
476
477         _unlock_rx_hashtbl(bond);
478
479         write_lock_bh(&bond->curr_slave_lock);
480
481         if (slave != bond->curr_active_slave) {
482                 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
483         }
484
485         write_unlock_bh(&bond->curr_slave_lock);
486 }
487
488 static void rlb_update_client(struct rlb_client_info *client_info)
489 {
490         int i;
491
492         if (!client_info->slave) {
493                 return;
494         }
495
496         for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
497                 struct sk_buff *skb;
498
499                 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
500                                  client_info->ip_dst,
501                                  client_info->slave->dev,
502                                  client_info->ip_src,
503                                  client_info->mac_dst,
504                                  client_info->slave->dev->dev_addr,
505                                  client_info->mac_dst);
506                 if (!skb) {
507                         printk(KERN_ERR DRV_NAME
508                                ": %s: Error: failed to create an ARP packet\n",
509                                client_info->slave->dev->master->name);
510                         continue;
511                 }
512
513                 skb->dev = client_info->slave->dev;
514
515                 if (client_info->tag) {
516                         skb = vlan_put_tag(skb, client_info->vlan_id);
517                         if (!skb) {
518                                 printk(KERN_ERR DRV_NAME
519                                        ": %s: Error: failed to insert VLAN tag\n",
520                                        client_info->slave->dev->master->name);
521                                 continue;
522                         }
523                 }
524
525                 arp_xmit(skb);
526         }
527 }
528
529 /* sends ARP REPLIES that update the clients that need updating */
530 static void rlb_update_rx_clients(struct bonding *bond)
531 {
532         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
533         struct rlb_client_info *client_info;
534         u32 hash_index;
535
536         _lock_rx_hashtbl(bond);
537
538         hash_index = bond_info->rx_hashtbl_head;
539         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
540                 client_info = &(bond_info->rx_hashtbl[hash_index]);
541                 if (client_info->ntt) {
542                         rlb_update_client(client_info);
543                         if (bond_info->rlb_update_retry_counter == 0) {
544                                 client_info->ntt = 0;
545                         }
546                 }
547         }
548
549         /* do not update the entries again untill this counter is zero so that
550          * not to confuse the clients.
551          */
552         bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
553
554         _unlock_rx_hashtbl(bond);
555 }
556
557 /* The slave was assigned a new mac address - update the clients */
558 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
559 {
560         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
561         struct rlb_client_info *client_info;
562         int ntt = 0;
563         u32 hash_index;
564
565         _lock_rx_hashtbl(bond);
566
567         hash_index = bond_info->rx_hashtbl_head;
568         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
569                 client_info = &(bond_info->rx_hashtbl[hash_index]);
570
571                 if ((client_info->slave == slave) &&
572                     memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
573                         client_info->ntt = 1;
574                         ntt = 1;
575                 }
576         }
577
578         // update the team's flag only after the whole iteration
579         if (ntt) {
580                 bond_info->rx_ntt = 1;
581                 //fasten the change
582                 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
583         }
584
585         _unlock_rx_hashtbl(bond);
586 }
587
588 /* mark all clients using src_ip to be updated */
589 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
590 {
591         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
592         struct rlb_client_info *client_info;
593         u32 hash_index;
594
595         _lock_rx_hashtbl(bond);
596
597         hash_index = bond_info->rx_hashtbl_head;
598         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
599                 client_info = &(bond_info->rx_hashtbl[hash_index]);
600
601                 if (!client_info->slave) {
602                         printk(KERN_ERR DRV_NAME
603                                ": %s: Error: found a client with no channel in "
604                                "the client's hash table\n",
605                                bond->dev->name);
606                         continue;
607                 }
608                 /*update all clients using this src_ip, that are not assigned
609                  * to the team's address (curr_active_slave) and have a known
610                  * unicast mac address.
611                  */
612                 if ((client_info->ip_src == src_ip) &&
613                     memcmp(client_info->slave->dev->dev_addr,
614                            bond->dev->dev_addr, ETH_ALEN) &&
615                     memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
616                         client_info->ntt = 1;
617                         bond_info->rx_ntt = 1;
618                 }
619         }
620
621         _unlock_rx_hashtbl(bond);
622 }
623
624 /* Caller must hold both bond and ptr locks for read */
625 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
626 {
627         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
628         struct arp_pkt *arp = arp_pkt(skb);
629         struct slave *assigned_slave;
630         struct rlb_client_info *client_info;
631         u32 hash_index = 0;
632
633         _lock_rx_hashtbl(bond);
634
635         hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src));
636         client_info = &(bond_info->rx_hashtbl[hash_index]);
637
638         if (client_info->assigned) {
639                 if ((client_info->ip_src == arp->ip_src) &&
640                     (client_info->ip_dst == arp->ip_dst)) {
641                         /* the entry is already assigned to this client */
642                         if (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) {
643                                 /* update mac address from arp */
644                                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
645                         }
646
647                         assigned_slave = client_info->slave;
648                         if (assigned_slave) {
649                                 _unlock_rx_hashtbl(bond);
650                                 return assigned_slave;
651                         }
652                 } else {
653                         /* the entry is already assigned to some other client,
654                          * move the old client to primary (curr_active_slave) so
655                          * that the new client can be assigned to this entry.
656                          */
657                         if (bond->curr_active_slave &&
658                             client_info->slave != bond->curr_active_slave) {
659                                 client_info->slave = bond->curr_active_slave;
660                                 rlb_update_client(client_info);
661                         }
662                 }
663         }
664         /* assign a new slave */
665         assigned_slave = rlb_next_rx_slave(bond);
666
667         if (assigned_slave) {
668                 client_info->ip_src = arp->ip_src;
669                 client_info->ip_dst = arp->ip_dst;
670                 /* arp->mac_dst is broadcast for arp reqeusts.
671                  * will be updated with clients actual unicast mac address
672                  * upon receiving an arp reply.
673                  */
674                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
675                 client_info->slave = assigned_slave;
676
677                 if (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
678                         client_info->ntt = 1;
679                         bond->alb_info.rx_ntt = 1;
680                 } else {
681                         client_info->ntt = 0;
682                 }
683
684                 if (!list_empty(&bond->vlan_list)) {
685                         if (!vlan_get_tag(skb, &client_info->vlan_id))
686                                 client_info->tag = 1;
687                 }
688
689                 if (!client_info->assigned) {
690                         u32 prev_tbl_head = bond_info->rx_hashtbl_head;
691                         bond_info->rx_hashtbl_head = hash_index;
692                         client_info->next = prev_tbl_head;
693                         if (prev_tbl_head != RLB_NULL_INDEX) {
694                                 bond_info->rx_hashtbl[prev_tbl_head].prev =
695                                         hash_index;
696                         }
697                         client_info->assigned = 1;
698                 }
699         }
700
701         _unlock_rx_hashtbl(bond);
702
703         return assigned_slave;
704 }
705
706 /* chooses (and returns) transmit channel for arp reply
707  * does not choose channel for other arp types since they are
708  * sent on the curr_active_slave
709  */
710 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
711 {
712         struct arp_pkt *arp = arp_pkt(skb);
713         struct slave *tx_slave = NULL;
714
715         if (arp->op_code == htons(ARPOP_REPLY)) {
716                 /* the arp must be sent on the selected
717                 * rx channel
718                 */
719                 tx_slave = rlb_choose_channel(skb, bond);
720                 if (tx_slave) {
721                         memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
722                 }
723                 dprintk("Server sent ARP Reply packet\n");
724         } else if (arp->op_code == htons(ARPOP_REQUEST)) {
725                 /* Create an entry in the rx_hashtbl for this client as a
726                  * place holder.
727                  * When the arp reply is received the entry will be updated
728                  * with the correct unicast address of the client.
729                  */
730                 rlb_choose_channel(skb, bond);
731
732                 /* The ARP relpy packets must be delayed so that
733                  * they can cancel out the influence of the ARP request.
734                  */
735                 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
736
737                 /* arp requests are broadcast and are sent on the primary
738                  * the arp request will collapse all clients on the subnet to
739                  * the primary slave. We must register these clients to be
740                  * updated with their assigned mac.
741                  */
742                 rlb_req_update_subnet_clients(bond, arp->ip_src);
743                 dprintk("Server sent ARP Request packet\n");
744         }
745
746         return tx_slave;
747 }
748
749 /* Caller must hold bond lock for read */
750 static void rlb_rebalance(struct bonding *bond)
751 {
752         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
753         struct slave *assigned_slave;
754         struct rlb_client_info *client_info;
755         int ntt;
756         u32 hash_index;
757
758         _lock_rx_hashtbl(bond);
759
760         ntt = 0;
761         hash_index = bond_info->rx_hashtbl_head;
762         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
763                 client_info = &(bond_info->rx_hashtbl[hash_index]);
764                 assigned_slave = rlb_next_rx_slave(bond);
765                 if (assigned_slave && (client_info->slave != assigned_slave)) {
766                         client_info->slave = assigned_slave;
767                         client_info->ntt = 1;
768                         ntt = 1;
769                 }
770         }
771
772         /* update the team's flag only after the whole iteration */
773         if (ntt) {
774                 bond_info->rx_ntt = 1;
775         }
776         _unlock_rx_hashtbl(bond);
777 }
778
779 /* Caller must hold rx_hashtbl lock */
780 static void rlb_init_table_entry(struct rlb_client_info *entry)
781 {
782         memset(entry, 0, sizeof(struct rlb_client_info));
783         entry->next = RLB_NULL_INDEX;
784         entry->prev = RLB_NULL_INDEX;
785 }
786
787 static int rlb_initialize(struct bonding *bond)
788 {
789         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
790         struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type);
791         struct rlb_client_info  *new_hashtbl;
792         int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
793         int i;
794
795         spin_lock_init(&(bond_info->rx_hashtbl_lock));
796
797         new_hashtbl = kmalloc(size, GFP_KERNEL);
798         if (!new_hashtbl) {
799                 printk(KERN_ERR DRV_NAME
800                        ": %s: Error: Failed to allocate RLB hash table\n",
801                        bond->dev->name);
802                 return -1;
803         }
804         _lock_rx_hashtbl(bond);
805
806         bond_info->rx_hashtbl = new_hashtbl;
807
808         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
809
810         for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
811                 rlb_init_table_entry(bond_info->rx_hashtbl + i);
812         }
813
814         _unlock_rx_hashtbl(bond);
815
816         /*initialize packet type*/
817         pk_type->type = __constant_htons(ETH_P_ARP);
818         pk_type->dev = bond->dev;
819         pk_type->func = rlb_arp_recv;
820
821         /* register to receive ARPs */
822         dev_add_pack(pk_type);
823
824         return 0;
825 }
826
827 static void rlb_deinitialize(struct bonding *bond)
828 {
829         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
830
831         dev_remove_pack(&(bond_info->rlb_pkt_type));
832
833         _lock_rx_hashtbl(bond);
834
835         kfree(bond_info->rx_hashtbl);
836         bond_info->rx_hashtbl = NULL;
837         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
838
839         _unlock_rx_hashtbl(bond);
840 }
841
842 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
843 {
844         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
845         u32 curr_index;
846
847         _lock_rx_hashtbl(bond);
848
849         curr_index = bond_info->rx_hashtbl_head;
850         while (curr_index != RLB_NULL_INDEX) {
851                 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
852                 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
853                 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
854
855                 if (curr->tag && (curr->vlan_id == vlan_id)) {
856                         if (curr_index == bond_info->rx_hashtbl_head) {
857                                 bond_info->rx_hashtbl_head = next_index;
858                         }
859                         if (prev_index != RLB_NULL_INDEX) {
860                                 bond_info->rx_hashtbl[prev_index].next = next_index;
861                         }
862                         if (next_index != RLB_NULL_INDEX) {
863                                 bond_info->rx_hashtbl[next_index].prev = prev_index;
864                         }
865
866                         rlb_init_table_entry(curr);
867                 }
868
869                 curr_index = next_index;
870         }
871
872         _unlock_rx_hashtbl(bond);
873 }
874
875 /*********************** tlb/rlb shared functions *********************/
876
877 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
878 {
879         struct bonding *bond = bond_get_bond_by_slave(slave);
880         struct learning_pkt pkt;
881         int size = sizeof(struct learning_pkt);
882         int i;
883
884         memset(&pkt, 0, size);
885         memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
886         memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
887         pkt.type = __constant_htons(ETH_P_LOOP);
888
889         for (i = 0; i < MAX_LP_BURST; i++) {
890                 struct sk_buff *skb;
891                 char *data;
892
893                 skb = dev_alloc_skb(size);
894                 if (!skb) {
895                         return;
896                 }
897
898                 data = skb_put(skb, size);
899                 memcpy(data, &pkt, size);
900
901                 skb_reset_mac_header(skb);
902                 skb->network_header = skb->mac_header + ETH_HLEN;
903                 skb->protocol = pkt.type;
904                 skb->priority = TC_PRIO_CONTROL;
905                 skb->dev = slave->dev;
906
907                 if (!list_empty(&bond->vlan_list)) {
908                         struct vlan_entry *vlan;
909
910                         vlan = bond_next_vlan(bond,
911                                               bond->alb_info.current_alb_vlan);
912
913                         bond->alb_info.current_alb_vlan = vlan;
914                         if (!vlan) {
915                                 kfree_skb(skb);
916                                 continue;
917                         }
918
919                         skb = vlan_put_tag(skb, vlan->vlan_id);
920                         if (!skb) {
921                                 printk(KERN_ERR DRV_NAME
922                                        ": %s: Error: failed to insert VLAN tag\n",
923                                        bond->dev->name);
924                                 continue;
925                         }
926                 }
927
928                 dev_queue_xmit(skb);
929         }
930 }
931
932 /* hw is a boolean parameter that determines whether we should try and
933  * set the hw address of the device as well as the hw address of the
934  * net_device
935  */
936 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
937 {
938         struct net_device *dev = slave->dev;
939         struct sockaddr s_addr;
940
941         if (!hw) {
942                 memcpy(dev->dev_addr, addr, dev->addr_len);
943                 return 0;
944         }
945
946         /* for rlb each slave must have a unique hw mac addresses so that */
947         /* each slave will receive packets destined to a different mac */
948         memcpy(s_addr.sa_data, addr, dev->addr_len);
949         s_addr.sa_family = dev->type;
950         if (dev_set_mac_address(dev, &s_addr)) {
951                 printk(KERN_ERR DRV_NAME
952                        ": %s: Error: dev_set_mac_address of dev %s failed! ALB "
953                        "mode requires that the base driver support setting "
954                        "the hw address also when the network device's "
955                        "interface is open\n",
956                        dev->master->name, dev->name);
957                 return -EOPNOTSUPP;
958         }
959         return 0;
960 }
961
962 /*
963  * Swap MAC addresses between two slaves.
964  *
965  * Called with RTNL held, and no other locks.
966  *
967  */
968
969 static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
970 {
971         u8 tmp_mac_addr[ETH_ALEN];
972
973         memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
974         alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
975         alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
976
977 }
978
979 /*
980  * Send learning packets after MAC address swap.
981  *
982  * Called with RTNL and no other locks
983  */
984 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
985                                 struct slave *slave2)
986 {
987         int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
988         struct slave *disabled_slave = NULL;
989
990         ASSERT_RTNL();
991
992         /* fasten the change in the switch */
993         if (SLAVE_IS_OK(slave1)) {
994                 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
995                 if (bond->alb_info.rlb_enabled) {
996                         /* inform the clients that the mac address
997                          * has changed
998                          */
999                         rlb_req_update_slave_clients(bond, slave1);
1000                 }
1001         } else {
1002                 disabled_slave = slave1;
1003         }
1004
1005         if (SLAVE_IS_OK(slave2)) {
1006                 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
1007                 if (bond->alb_info.rlb_enabled) {
1008                         /* inform the clients that the mac address
1009                          * has changed
1010                          */
1011                         rlb_req_update_slave_clients(bond, slave2);
1012                 }
1013         } else {
1014                 disabled_slave = slave2;
1015         }
1016
1017         if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1018                 /* A disabled slave was assigned an active mac addr */
1019                 rlb_teach_disabled_mac_on_primary(bond,
1020                                                   disabled_slave->dev->dev_addr);
1021         }
1022 }
1023
1024 /**
1025  * alb_change_hw_addr_on_detach
1026  * @bond: bonding we're working on
1027  * @slave: the slave that was just detached
1028  *
1029  * We assume that @slave was already detached from the slave list.
1030  *
1031  * If @slave's permanent hw address is different both from its current
1032  * address and from @bond's address, then somewhere in the bond there's
1033  * a slave that has @slave's permanet address as its current address.
1034  * We'll make sure that that slave no longer uses @slave's permanent address.
1035  *
1036  * Caller must hold RTNL and no other locks
1037  */
1038 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1039 {
1040         int perm_curr_diff;
1041         int perm_bond_diff;
1042
1043         perm_curr_diff = memcmp(slave->perm_hwaddr,
1044                                 slave->dev->dev_addr,
1045                                 ETH_ALEN);
1046         perm_bond_diff = memcmp(slave->perm_hwaddr,
1047                                 bond->dev->dev_addr,
1048                                 ETH_ALEN);
1049
1050         if (perm_curr_diff && perm_bond_diff) {
1051                 struct slave *tmp_slave;
1052                 int i, found = 0;
1053
1054                 bond_for_each_slave(bond, tmp_slave, i) {
1055                         if (!memcmp(slave->perm_hwaddr,
1056                                     tmp_slave->dev->dev_addr,
1057                                     ETH_ALEN)) {
1058                                 found = 1;
1059                                 break;
1060                         }
1061                 }
1062
1063                 if (found) {
1064                         /* locking: needs RTNL and nothing else */
1065                         alb_swap_mac_addr(bond, slave, tmp_slave);
1066                         alb_fasten_mac_swap(bond, slave, tmp_slave);
1067                 }
1068         }
1069 }
1070
1071 /**
1072  * alb_handle_addr_collision_on_attach
1073  * @bond: bonding we're working on
1074  * @slave: the slave that was just attached
1075  *
1076  * checks uniqueness of slave's mac address and handles the case the
1077  * new slave uses the bonds mac address.
1078  *
1079  * If the permanent hw address of @slave is @bond's hw address, we need to
1080  * find a different hw address to give @slave, that isn't in use by any other
1081  * slave in the bond. This address must be, of course, one of the premanent
1082  * addresses of the other slaves.
1083  *
1084  * We go over the slave list, and for each slave there we compare its
1085  * permanent hw address with the current address of all the other slaves.
1086  * If no match was found, then we've found a slave with a permanent address
1087  * that isn't used by any other slave in the bond, so we can assign it to
1088  * @slave.
1089  *
1090  * assumption: this function is called before @slave is attached to the
1091  *             bond slave list.
1092  *
1093  * caller must hold the bond lock for write since the mac addresses are compared
1094  * and may be swapped.
1095  */
1096 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1097 {
1098         struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1099         struct slave *has_bond_addr = bond->curr_active_slave;
1100         int i, j, found = 0;
1101
1102         if (bond->slave_cnt == 0) {
1103                 /* this is the first slave */
1104                 return 0;
1105         }
1106
1107         /* if slave's mac address differs from bond's mac address
1108          * check uniqueness of slave's mac address against the other
1109          * slaves in the bond.
1110          */
1111         if (memcmp(slave->perm_hwaddr, bond->dev->dev_addr, ETH_ALEN)) {
1112                 bond_for_each_slave(bond, tmp_slave1, i) {
1113                         if (!memcmp(tmp_slave1->dev->dev_addr, slave->dev->dev_addr,
1114                                     ETH_ALEN)) {
1115                                 found = 1;
1116                                 break;
1117                         }
1118                 }
1119
1120                 if (!found)
1121                         return 0;
1122
1123                 /* Try setting slave mac to bond address and fall-through
1124                    to code handling that situation below... */
1125                 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1126                                        bond->alb_info.rlb_enabled);
1127         }
1128
1129         /* The slave's address is equal to the address of the bond.
1130          * Search for a spare address in the bond for this slave.
1131          */
1132         free_mac_slave = NULL;
1133
1134         bond_for_each_slave(bond, tmp_slave1, i) {
1135                 found = 0;
1136                 bond_for_each_slave(bond, tmp_slave2, j) {
1137                         if (!memcmp(tmp_slave1->perm_hwaddr,
1138                                     tmp_slave2->dev->dev_addr,
1139                                     ETH_ALEN)) {
1140                                 found = 1;
1141                                 break;
1142                         }
1143                 }
1144
1145                 if (!found) {
1146                         /* no slave has tmp_slave1's perm addr
1147                          * as its curr addr
1148                          */
1149                         free_mac_slave = tmp_slave1;
1150                         break;
1151                 }
1152
1153                 if (!has_bond_addr) {
1154                         if (!memcmp(tmp_slave1->dev->dev_addr,
1155                                     bond->dev->dev_addr,
1156                                     ETH_ALEN)) {
1157
1158                                 has_bond_addr = tmp_slave1;
1159                         }
1160                 }
1161         }
1162
1163         if (free_mac_slave) {
1164                 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1165                                        bond->alb_info.rlb_enabled);
1166
1167                 printk(KERN_WARNING DRV_NAME
1168                        ": %s: Warning: the hw address of slave %s is in use by "
1169                        "the bond; giving it the hw address of %s\n",
1170                        bond->dev->name, slave->dev->name, free_mac_slave->dev->name);
1171
1172         } else if (has_bond_addr) {
1173                 printk(KERN_ERR DRV_NAME
1174                        ": %s: Error: the hw address of slave %s is in use by the "
1175                        "bond; couldn't find a slave with a free hw address to "
1176                        "give it (this should not have happened)\n",
1177                        bond->dev->name, slave->dev->name);
1178                 return -EFAULT;
1179         }
1180
1181         return 0;
1182 }
1183
1184 /**
1185  * alb_set_mac_address
1186  * @bond:
1187  * @addr:
1188  *
1189  * In TLB mode all slaves are configured to the bond's hw address, but set
1190  * their dev_addr field to different addresses (based on their permanent hw
1191  * addresses).
1192  *
1193  * For each slave, this function sets the interface to the new address and then
1194  * changes its dev_addr field to its previous value.
1195  *
1196  * Unwinding assumes bond's mac address has not yet changed.
1197  */
1198 static int alb_set_mac_address(struct bonding *bond, void *addr)
1199 {
1200         struct sockaddr sa;
1201         struct slave *slave, *stop_at;
1202         char tmp_addr[ETH_ALEN];
1203         int res;
1204         int i;
1205
1206         if (bond->alb_info.rlb_enabled) {
1207                 return 0;
1208         }
1209
1210         bond_for_each_slave(bond, slave, i) {
1211                 if (slave->dev->set_mac_address == NULL) {
1212                         res = -EOPNOTSUPP;
1213                         goto unwind;
1214                 }
1215
1216                 /* save net_device's current hw address */
1217                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1218
1219                 res = dev_set_mac_address(slave->dev, addr);
1220
1221                 /* restore net_device's hw address */
1222                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1223
1224                 if (res) {
1225                         goto unwind;
1226                 }
1227         }
1228
1229         return 0;
1230
1231 unwind:
1232         memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1233         sa.sa_family = bond->dev->type;
1234
1235         /* unwind from head to the slave that failed */
1236         stop_at = slave;
1237         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1238                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1239                 dev_set_mac_address(slave->dev, &sa);
1240                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1241         }
1242
1243         return res;
1244 }
1245
1246 /************************ exported alb funcions ************************/
1247
1248 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1249 {
1250         int res;
1251
1252         res = tlb_initialize(bond);
1253         if (res) {
1254                 return res;
1255         }
1256
1257         if (rlb_enabled) {
1258                 bond->alb_info.rlb_enabled = 1;
1259                 /* initialize rlb */
1260                 res = rlb_initialize(bond);
1261                 if (res) {
1262                         tlb_deinitialize(bond);
1263                         return res;
1264                 }
1265         } else {
1266                 bond->alb_info.rlb_enabled = 0;
1267         }
1268
1269         return 0;
1270 }
1271
1272 void bond_alb_deinitialize(struct bonding *bond)
1273 {
1274         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1275
1276         tlb_deinitialize(bond);
1277
1278         if (bond_info->rlb_enabled) {
1279                 rlb_deinitialize(bond);
1280         }
1281 }
1282
1283 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1284 {
1285         struct bonding *bond = bond_dev->priv;
1286         struct ethhdr *eth_data;
1287         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1288         struct slave *tx_slave = NULL;
1289         static const __be32 ip_bcast = htonl(0xffffffff);
1290         int hash_size = 0;
1291         int do_tx_balance = 1;
1292         u32 hash_index = 0;
1293         const u8 *hash_start = NULL;
1294         int res = 1;
1295         struct ipv6hdr *ip6hdr;
1296
1297         skb_reset_mac_header(skb);
1298         eth_data = eth_hdr(skb);
1299
1300         /* make sure that the curr_active_slave and the slaves list do
1301          * not change during tx
1302          */
1303         read_lock(&bond->lock);
1304         read_lock(&bond->curr_slave_lock);
1305
1306         if (!BOND_IS_OK(bond)) {
1307                 goto out;
1308         }
1309
1310         switch (ntohs(skb->protocol)) {
1311         case ETH_P_IP: {
1312                 const struct iphdr *iph = ip_hdr(skb);
1313
1314                 if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) ||
1315                     (iph->daddr == ip_bcast) ||
1316                     (iph->protocol == IPPROTO_IGMP)) {
1317                         do_tx_balance = 0;
1318                         break;
1319                 }
1320                 hash_start = (char *)&(iph->daddr);
1321                 hash_size = sizeof(iph->daddr);
1322         }
1323                 break;
1324         case ETH_P_IPV6:
1325                 /* IPv6 doesn't really use broadcast mac address, but leave
1326                  * that here just in case.
1327                  */
1328                 if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {
1329                         do_tx_balance = 0;
1330                         break;
1331                 }
1332
1333                 /* IPv6 uses all-nodes multicast as an equivalent to
1334                  * broadcasts in IPv4.
1335                  */
1336                 if (memcmp(eth_data->h_dest, mac_v6_allmcast, ETH_ALEN) == 0) {
1337                         do_tx_balance = 0;
1338                         break;
1339                 }
1340
1341                 /* Additianally, DAD probes should not be tx-balanced as that
1342                  * will lead to false positives for duplicate addresses and
1343                  * prevent address configuration from working.
1344                  */
1345                 ip6hdr = ipv6_hdr(skb);
1346                 if (ipv6_addr_any(&ip6hdr->saddr)) {
1347                         do_tx_balance = 0;
1348                         break;
1349                 }
1350
1351                 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1352                 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1353                 break;
1354         case ETH_P_IPX:
1355                 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1356                         /* something is wrong with this packet */
1357                         do_tx_balance = 0;
1358                         break;
1359                 }
1360
1361                 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1362                         /* The only protocol worth balancing in
1363                          * this family since it has an "ARP" like
1364                          * mechanism
1365                          */
1366                         do_tx_balance = 0;
1367                         break;
1368                 }
1369
1370                 hash_start = (char*)eth_data->h_dest;
1371                 hash_size = ETH_ALEN;
1372                 break;
1373         case ETH_P_ARP:
1374                 do_tx_balance = 0;
1375                 if (bond_info->rlb_enabled) {
1376                         tx_slave = rlb_arp_xmit(skb, bond);
1377                 }
1378                 break;
1379         default:
1380                 do_tx_balance = 0;
1381                 break;
1382         }
1383
1384         if (do_tx_balance) {
1385                 hash_index = _simple_hash(hash_start, hash_size);
1386                 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1387         }
1388
1389         if (!tx_slave) {
1390                 /* unbalanced or unassigned, send through primary */
1391                 tx_slave = bond->curr_active_slave;
1392                 bond_info->unbalanced_load += skb->len;
1393         }
1394
1395         if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1396                 if (tx_slave != bond->curr_active_slave) {
1397                         memcpy(eth_data->h_source,
1398                                tx_slave->dev->dev_addr,
1399                                ETH_ALEN);
1400                 }
1401
1402                 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1403         } else {
1404                 if (tx_slave) {
1405                         tlb_clear_slave(bond, tx_slave, 0);
1406                 }
1407         }
1408
1409 out:
1410         if (res) {
1411                 /* no suitable interface, frame not sent */
1412                 dev_kfree_skb(skb);
1413         }
1414         read_unlock(&bond->curr_slave_lock);
1415         read_unlock(&bond->lock);
1416         return 0;
1417 }
1418
1419 void bond_alb_monitor(struct work_struct *work)
1420 {
1421         struct bonding *bond = container_of(work, struct bonding,
1422                                             alb_work.work);
1423         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1424         struct slave *slave;
1425         int i;
1426
1427         read_lock(&bond->lock);
1428
1429         if (bond->kill_timers) {
1430                 goto out;
1431         }
1432
1433         if (bond->slave_cnt == 0) {
1434                 bond_info->tx_rebalance_counter = 0;
1435                 bond_info->lp_counter = 0;
1436                 goto re_arm;
1437         }
1438
1439         bond_info->tx_rebalance_counter++;
1440         bond_info->lp_counter++;
1441
1442         /* send learning packets */
1443         if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1444                 /* change of curr_active_slave involves swapping of mac addresses.
1445                  * in order to avoid this swapping from happening while
1446                  * sending the learning packets, the curr_slave_lock must be held for
1447                  * read.
1448                  */
1449                 read_lock(&bond->curr_slave_lock);
1450
1451                 bond_for_each_slave(bond, slave, i) {
1452                         alb_send_learning_packets(slave, slave->dev->dev_addr);
1453                 }
1454
1455                 read_unlock(&bond->curr_slave_lock);
1456
1457                 bond_info->lp_counter = 0;
1458         }
1459
1460         /* rebalance tx traffic */
1461         if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1462
1463                 read_lock(&bond->curr_slave_lock);
1464
1465                 bond_for_each_slave(bond, slave, i) {
1466                         tlb_clear_slave(bond, slave, 1);
1467                         if (slave == bond->curr_active_slave) {
1468                                 SLAVE_TLB_INFO(slave).load =
1469                                         bond_info->unbalanced_load /
1470                                                 BOND_TLB_REBALANCE_INTERVAL;
1471                                 bond_info->unbalanced_load = 0;
1472                         }
1473                 }
1474
1475                 read_unlock(&bond->curr_slave_lock);
1476
1477                 bond_info->tx_rebalance_counter = 0;
1478         }
1479
1480         /* handle rlb stuff */
1481         if (bond_info->rlb_enabled) {
1482                 if (bond_info->primary_is_promisc &&
1483                     (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1484
1485                         /*
1486                          * dev_set_promiscuity requires rtnl and
1487                          * nothing else.
1488                          */
1489                         read_unlock(&bond->lock);
1490                         rtnl_lock();
1491
1492                         bond_info->rlb_promisc_timeout_counter = 0;
1493
1494                         /* If the primary was set to promiscuous mode
1495                          * because a slave was disabled then
1496                          * it can now leave promiscuous mode.
1497                          */
1498                         dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1499                         bond_info->primary_is_promisc = 0;
1500
1501                         rtnl_unlock();
1502                         read_lock(&bond->lock);
1503                 }
1504
1505                 if (bond_info->rlb_rebalance) {
1506                         bond_info->rlb_rebalance = 0;
1507                         rlb_rebalance(bond);
1508                 }
1509
1510                 /* check if clients need updating */
1511                 if (bond_info->rx_ntt) {
1512                         if (bond_info->rlb_update_delay_counter) {
1513                                 --bond_info->rlb_update_delay_counter;
1514                         } else {
1515                                 rlb_update_rx_clients(bond);
1516                                 if (bond_info->rlb_update_retry_counter) {
1517                                         --bond_info->rlb_update_retry_counter;
1518                                 } else {
1519                                         bond_info->rx_ntt = 0;
1520                                 }
1521                         }
1522                 }
1523         }
1524
1525 re_arm:
1526         queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1527 out:
1528         read_unlock(&bond->lock);
1529 }
1530
1531 /* assumption: called before the slave is attached to the bond
1532  * and not locked by the bond lock
1533  */
1534 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1535 {
1536         int res;
1537
1538         res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1539                                      bond->alb_info.rlb_enabled);
1540         if (res) {
1541                 return res;
1542         }
1543
1544         /* caller must hold the bond lock for write since the mac addresses
1545          * are compared and may be swapped.
1546          */
1547         read_lock(&bond->lock);
1548
1549         res = alb_handle_addr_collision_on_attach(bond, slave);
1550
1551         read_unlock(&bond->lock);
1552
1553         if (res) {
1554                 return res;
1555         }
1556
1557         tlb_init_slave(slave);
1558
1559         /* order a rebalance ASAP */
1560         bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1561
1562         if (bond->alb_info.rlb_enabled) {
1563                 bond->alb_info.rlb_rebalance = 1;
1564         }
1565
1566         return 0;
1567 }
1568
1569 /*
1570  * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1571  * if necessary.
1572  *
1573  * Caller must hold RTNL and no other locks
1574  */
1575 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1576 {
1577         if (bond->slave_cnt > 1) {
1578                 alb_change_hw_addr_on_detach(bond, slave);
1579         }
1580
1581         tlb_clear_slave(bond, slave, 0);
1582
1583         if (bond->alb_info.rlb_enabled) {
1584                 bond->alb_info.next_rx_slave = NULL;
1585                 rlb_clear_slave(bond, slave);
1586         }
1587 }
1588
1589 /* Caller must hold bond lock for read */
1590 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1591 {
1592         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1593
1594         if (link == BOND_LINK_DOWN) {
1595                 tlb_clear_slave(bond, slave, 0);
1596                 if (bond->alb_info.rlb_enabled) {
1597                         rlb_clear_slave(bond, slave);
1598                 }
1599         } else if (link == BOND_LINK_UP) {
1600                 /* order a rebalance ASAP */
1601                 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1602                 if (bond->alb_info.rlb_enabled) {
1603                         bond->alb_info.rlb_rebalance = 1;
1604                         /* If the updelay module parameter is smaller than the
1605                          * forwarding delay of the switch the rebalance will
1606                          * not work because the rebalance arp replies will
1607                          * not be forwarded to the clients..
1608                          */
1609                 }
1610         }
1611 }
1612
1613 /**
1614  * bond_alb_handle_active_change - assign new curr_active_slave
1615  * @bond: our bonding struct
1616  * @new_slave: new slave to assign
1617  *
1618  * Set the bond->curr_active_slave to @new_slave and handle
1619  * mac address swapping and promiscuity changes as needed.
1620  *
1621  * If new_slave is NULL, caller must hold curr_slave_lock or
1622  * bond->lock for write.
1623  *
1624  * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1625  * read and curr_slave_lock for write.  Processing here may sleep, so
1626  * no other locks may be held.
1627  */
1628 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1629 {
1630         struct slave *swap_slave;
1631         int i;
1632
1633         if (bond->curr_active_slave == new_slave) {
1634                 return;
1635         }
1636
1637         if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1638                 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1639                 bond->alb_info.primary_is_promisc = 0;
1640                 bond->alb_info.rlb_promisc_timeout_counter = 0;
1641         }
1642
1643         swap_slave = bond->curr_active_slave;
1644         bond->curr_active_slave = new_slave;
1645
1646         if (!new_slave || (bond->slave_cnt == 0)) {
1647                 return;
1648         }
1649
1650         /* set the new curr_active_slave to the bonds mac address
1651          * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1652          */
1653         if (!swap_slave) {
1654                 struct slave *tmp_slave;
1655                 /* find slave that is holding the bond's mac address */
1656                 bond_for_each_slave(bond, tmp_slave, i) {
1657                         if (!memcmp(tmp_slave->dev->dev_addr,
1658                                     bond->dev->dev_addr, ETH_ALEN)) {
1659                                 swap_slave = tmp_slave;
1660                                 break;
1661                         }
1662                 }
1663         }
1664
1665         /*
1666          * Arrange for swap_slave and new_slave to temporarily be
1667          * ignored so we can mess with their MAC addresses without
1668          * fear of interference from transmit activity.
1669          */
1670         if (swap_slave) {
1671                 tlb_clear_slave(bond, swap_slave, 1);
1672         }
1673         tlb_clear_slave(bond, new_slave, 1);
1674
1675         write_unlock_bh(&bond->curr_slave_lock);
1676         read_unlock(&bond->lock);
1677
1678         ASSERT_RTNL();
1679
1680         /* curr_active_slave must be set before calling alb_swap_mac_addr */
1681         if (swap_slave) {
1682                 /* swap mac address */
1683                 alb_swap_mac_addr(bond, swap_slave, new_slave);
1684         } else {
1685                 /* set the new_slave to the bond mac address */
1686                 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1687                                        bond->alb_info.rlb_enabled);
1688         }
1689
1690         if (swap_slave) {
1691                 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1692                 read_lock(&bond->lock);
1693         } else {
1694                 read_lock(&bond->lock);
1695                 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1696         }
1697
1698         write_lock_bh(&bond->curr_slave_lock);
1699 }
1700
1701 /*
1702  * Called with RTNL
1703  */
1704 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1705 {
1706         struct bonding *bond = bond_dev->priv;
1707         struct sockaddr *sa = addr;
1708         struct slave *slave, *swap_slave;
1709         int res;
1710         int i;
1711
1712         if (!is_valid_ether_addr(sa->sa_data)) {
1713                 return -EADDRNOTAVAIL;
1714         }
1715
1716         res = alb_set_mac_address(bond, addr);
1717         if (res) {
1718                 return res;
1719         }
1720
1721         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1722
1723         /* If there is no curr_active_slave there is nothing else to do.
1724          * Otherwise we'll need to pass the new address to it and handle
1725          * duplications.
1726          */
1727         if (!bond->curr_active_slave) {
1728                 return 0;
1729         }
1730
1731         swap_slave = NULL;
1732
1733         bond_for_each_slave(bond, slave, i) {
1734                 if (!memcmp(slave->dev->dev_addr, bond_dev->dev_addr, ETH_ALEN)) {
1735                         swap_slave = slave;
1736                         break;
1737                 }
1738         }
1739
1740         write_unlock_bh(&bond->curr_slave_lock);
1741         read_unlock(&bond->lock);
1742
1743         if (swap_slave) {
1744                 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
1745                 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1746         } else {
1747                 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
1748                                        bond->alb_info.rlb_enabled);
1749
1750                 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1751                 if (bond->alb_info.rlb_enabled) {
1752                         /* inform clients mac address has changed */
1753                         rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1754                 }
1755         }
1756
1757         read_lock(&bond->lock);
1758         write_lock_bh(&bond->curr_slave_lock);
1759
1760         return 0;
1761 }
1762
1763 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1764 {
1765         if (bond->alb_info.current_alb_vlan &&
1766             (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1767                 bond->alb_info.current_alb_vlan = NULL;
1768         }
1769
1770         if (bond->alb_info.rlb_enabled) {
1771                 rlb_clear_vlan(bond, vlan_id);
1772         }
1773 }
1774