Commit | Line | Data |
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1da177e4 LT |
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 | * | |
1da177e4 LT |
21 | */ |
22 | ||
1da177e4 LT |
23 | #include <linux/skbuff.h> |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/etherdevice.h> | |
26 | #include <linux/pkt_sched.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/ip.h> | |
31 | #include <linux/ipv6.h> | |
32 | #include <linux/if_arp.h> | |
33 | #include <linux/if_ether.h> | |
34 | #include <linux/if_bonding.h> | |
35 | #include <linux/if_vlan.h> | |
36 | #include <linux/in.h> | |
37 | #include <net/ipx.h> | |
38 | #include <net/arp.h> | |
2d1ea19d | 39 | #include <net/ipv6.h> |
1da177e4 LT |
40 | #include <asm/byteorder.h> |
41 | #include "bonding.h" | |
42 | #include "bond_alb.h" | |
43 | ||
44 | ||
45 | #define ALB_TIMER_TICKS_PER_SEC 10 /* should be a divisor of HZ */ | |
46 | #define BOND_TLB_REBALANCE_INTERVAL 10 /* In seconds, periodic re-balancing. | |
47 | * Used for division - never set | |
48 | * to zero !!! | |
49 | */ | |
50 | #define BOND_ALB_LP_INTERVAL 1 /* In seconds, periodic send of | |
51 | * learning packets to the switch | |
52 | */ | |
53 | ||
54 | #define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \ | |
55 | * ALB_TIMER_TICKS_PER_SEC) | |
56 | ||
57 | #define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \ | |
58 | * ALB_TIMER_TICKS_PER_SEC) | |
59 | ||
60 | #define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table. | |
61 | * Note that this value MUST NOT be smaller | |
62 | * because the key hash table is BYTE wide ! | |
63 | */ | |
64 | ||
65 | ||
66 | #define TLB_NULL_INDEX 0xffffffff | |
67 | #define MAX_LP_BURST 3 | |
68 | ||
69 | /* rlb defs */ | |
70 | #define RLB_HASH_TABLE_SIZE 256 | |
71 | #define RLB_NULL_INDEX 0xffffffff | |
72 | #define RLB_UPDATE_DELAY 2*ALB_TIMER_TICKS_PER_SEC /* 2 seconds */ | |
73 | #define RLB_ARP_BURST_SIZE 2 | |
74 | #define RLB_UPDATE_RETRY 3 /* 3-ticks - must be smaller than the rlb | |
75 | * rebalance interval (5 min). | |
76 | */ | |
77 | /* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is | |
78 | * promiscuous after failover | |
79 | */ | |
80 | #define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC | |
81 | ||
82 | static const u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff}; | |
2d1ea19d | 83 | static const u8 mac_v6_allmcast[ETH_ALEN] = {0x33,0x33,0x00,0x00,0x00,0x01}; |
1da177e4 LT |
84 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
85 | ||
86 | #pragma pack(1) | |
87 | struct learning_pkt { | |
88 | u8 mac_dst[ETH_ALEN]; | |
89 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 90 | __be16 type; |
1da177e4 LT |
91 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
92 | }; | |
93 | ||
94 | struct arp_pkt { | |
d3bb52b0 AV |
95 | __be16 hw_addr_space; |
96 | __be16 prot_addr_space; | |
1da177e4 LT |
97 | u8 hw_addr_len; |
98 | u8 prot_addr_len; | |
d3bb52b0 | 99 | __be16 op_code; |
1da177e4 | 100 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 101 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 102 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 103 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
104 | }; |
105 | #pragma pack() | |
106 | ||
a16aeb36 ACM |
107 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
108 | { | |
d56f90a7 | 109 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
110 | } |
111 | ||
1da177e4 LT |
112 | /* Forward declaration */ |
113 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); | |
114 | ||
eddc9ec5 | 115 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
116 | { |
117 | int i; | |
118 | u8 hash = 0; | |
119 | ||
120 | for (i = 0; i < hash_size; i++) { | |
121 | hash ^= hash_start[i]; | |
122 | } | |
123 | ||
124 | return hash; | |
125 | } | |
126 | ||
127 | /*********************** tlb specific functions ***************************/ | |
128 | ||
129 | static inline void _lock_tx_hashtbl(struct bonding *bond) | |
130 | { | |
6603a6f2 | 131 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
132 | } |
133 | ||
134 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
135 | { | |
6603a6f2 | 136 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
137 | } |
138 | ||
139 | /* Caller must hold tx_hashtbl lock */ | |
140 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
141 | { | |
142 | if (save_load) { | |
143 | entry->load_history = 1 + entry->tx_bytes / | |
144 | BOND_TLB_REBALANCE_INTERVAL; | |
145 | entry->tx_bytes = 0; | |
146 | } | |
147 | ||
148 | entry->tx_slave = NULL; | |
149 | entry->next = TLB_NULL_INDEX; | |
150 | entry->prev = TLB_NULL_INDEX; | |
151 | } | |
152 | ||
153 | static inline void tlb_init_slave(struct slave *slave) | |
154 | { | |
155 | SLAVE_TLB_INFO(slave).load = 0; | |
156 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
157 | } | |
158 | ||
159 | /* Caller must hold bond lock for read */ | |
160 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load) | |
161 | { | |
162 | struct tlb_client_info *tx_hash_table; | |
163 | u32 index; | |
164 | ||
165 | _lock_tx_hashtbl(bond); | |
166 | ||
167 | /* clear slave from tx_hashtbl */ | |
168 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
169 | ||
ce39a800 AG |
170 | /* skip this if we've already freed the tx hash table */ |
171 | if (tx_hash_table) { | |
172 | index = SLAVE_TLB_INFO(slave).head; | |
173 | while (index != TLB_NULL_INDEX) { | |
174 | u32 next_index = tx_hash_table[index].next; | |
175 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
176 | index = next_index; | |
177 | } | |
1da177e4 LT |
178 | } |
179 | ||
1da177e4 | 180 | tlb_init_slave(slave); |
5af47b2f JV |
181 | |
182 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
183 | } |
184 | ||
185 | /* Must be called before starting the monitor timer */ | |
186 | static int tlb_initialize(struct bonding *bond) | |
187 | { | |
188 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
189 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 190 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
191 | int i; |
192 | ||
193 | spin_lock_init(&(bond_info->tx_hashtbl_lock)); | |
194 | ||
243cb4e5 | 195 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
0d206a3a | 196 | if (!new_hashtbl) { |
1da177e4 | 197 | printk(KERN_ERR DRV_NAME |
4e0952c7 | 198 | ": %s: Error: Failed to allocate TLB hash table\n", |
1da177e4 | 199 | bond->dev->name); |
1da177e4 LT |
200 | return -1; |
201 | } | |
0d206a3a MW |
202 | _lock_tx_hashtbl(bond); |
203 | ||
204 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 205 | |
1da177e4 LT |
206 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { |
207 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1); | |
208 | } | |
209 | ||
210 | _unlock_tx_hashtbl(bond); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | /* Must be called only after all slaves have been released */ | |
216 | static void tlb_deinitialize(struct bonding *bond) | |
217 | { | |
218 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
219 | ||
220 | _lock_tx_hashtbl(bond); | |
221 | ||
222 | kfree(bond_info->tx_hashtbl); | |
223 | bond_info->tx_hashtbl = NULL; | |
224 | ||
225 | _unlock_tx_hashtbl(bond); | |
226 | } | |
227 | ||
228 | /* Caller must hold bond lock for read */ | |
229 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
230 | { | |
231 | struct slave *slave, *least_loaded; | |
232 | s64 max_gap; | |
233 | int i, found = 0; | |
234 | ||
235 | /* Find the first enabled slave */ | |
236 | bond_for_each_slave(bond, slave, i) { | |
237 | if (SLAVE_IS_OK(slave)) { | |
238 | found = 1; | |
239 | break; | |
240 | } | |
241 | } | |
242 | ||
243 | if (!found) { | |
244 | return NULL; | |
245 | } | |
246 | ||
247 | least_loaded = slave; | |
248 | max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */ | |
249 | (s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
250 | ||
251 | /* Find the slave with the largest gap */ | |
252 | bond_for_each_slave_from(bond, slave, i, least_loaded) { | |
253 | if (SLAVE_IS_OK(slave)) { | |
254 | s64 gap = (s64)(slave->speed << 20) - | |
255 | (s64)(SLAVE_TLB_INFO(slave).load << 3); | |
256 | if (max_gap < gap) { | |
257 | least_loaded = slave; | |
258 | max_gap = gap; | |
259 | } | |
260 | } | |
261 | } | |
262 | ||
263 | return least_loaded; | |
264 | } | |
265 | ||
266 | /* Caller must hold bond lock for read */ | |
267 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len) | |
268 | { | |
269 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
270 | struct tlb_client_info *hash_table; | |
271 | struct slave *assigned_slave; | |
272 | ||
273 | _lock_tx_hashtbl(bond); | |
274 | ||
275 | hash_table = bond_info->tx_hashtbl; | |
276 | assigned_slave = hash_table[hash_index].tx_slave; | |
277 | if (!assigned_slave) { | |
278 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
279 | ||
280 | if (assigned_slave) { | |
281 | struct tlb_slave_info *slave_info = | |
282 | &(SLAVE_TLB_INFO(assigned_slave)); | |
283 | u32 next_index = slave_info->head; | |
284 | ||
285 | hash_table[hash_index].tx_slave = assigned_slave; | |
286 | hash_table[hash_index].next = next_index; | |
287 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
288 | ||
289 | if (next_index != TLB_NULL_INDEX) { | |
290 | hash_table[next_index].prev = hash_index; | |
291 | } | |
292 | ||
293 | slave_info->head = hash_index; | |
294 | slave_info->load += | |
295 | hash_table[hash_index].load_history; | |
296 | } | |
297 | } | |
298 | ||
299 | if (assigned_slave) { | |
300 | hash_table[hash_index].tx_bytes += skb_len; | |
301 | } | |
302 | ||
303 | _unlock_tx_hashtbl(bond); | |
304 | ||
305 | return assigned_slave; | |
306 | } | |
307 | ||
308 | /*********************** rlb specific functions ***************************/ | |
309 | static inline void _lock_rx_hashtbl(struct bonding *bond) | |
310 | { | |
6603a6f2 | 311 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
312 | } |
313 | ||
314 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
315 | { | |
6603a6f2 | 316 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
317 | } |
318 | ||
319 | /* when an ARP REPLY is received from a client update its info | |
320 | * in the rx_hashtbl | |
321 | */ | |
322 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
323 | { | |
324 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
325 | struct rlb_client_info *client_info; | |
326 | u32 hash_index; | |
327 | ||
328 | _lock_rx_hashtbl(bond); | |
329 | ||
330 | hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
331 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
332 | ||
333 | if ((client_info->assigned) && | |
334 | (client_info->ip_src == arp->ip_dst) && | |
335 | (client_info->ip_dst == arp->ip_src)) { | |
336 | /* update the clients MAC address */ | |
337 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
338 | client_info->ntt = 1; | |
339 | bond_info->rx_ntt = 1; | |
340 | } | |
341 | ||
342 | _unlock_rx_hashtbl(bond); | |
343 | } | |
344 | ||
f2ccd8fa | 345 | static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev) |
1da177e4 | 346 | { |
6146b1a4 | 347 | struct bonding *bond; |
1da177e4 LT |
348 | struct arp_pkt *arp = (struct arp_pkt *)skb->data; |
349 | int res = NET_RX_DROP; | |
350 | ||
c346dca1 | 351 | if (dev_net(bond_dev) != &init_net) |
e730c155 EB |
352 | goto out; |
353 | ||
6146b1a4 JV |
354 | while (bond_dev->priv_flags & IFF_802_1Q_VLAN) |
355 | bond_dev = vlan_dev_real_dev(bond_dev); | |
356 | ||
357 | if (!(bond_dev->priv_flags & IFF_BONDING) || | |
358 | !(bond_dev->flags & IFF_MASTER)) | |
1da177e4 | 359 | goto out; |
1da177e4 LT |
360 | |
361 | if (!arp) { | |
5a03cdb7 | 362 | pr_debug("Packet has no ARP data\n"); |
1da177e4 LT |
363 | goto out; |
364 | } | |
365 | ||
366 | if (skb->len < sizeof(struct arp_pkt)) { | |
5a03cdb7 | 367 | pr_debug("Packet is too small to be an ARP\n"); |
1da177e4 LT |
368 | goto out; |
369 | } | |
370 | ||
371 | if (arp->op_code == htons(ARPOP_REPLY)) { | |
372 | /* update rx hash table for this ARP */ | |
6146b1a4 JV |
373 | printk("rar: update orig %s bond_dev %s\n", orig_dev->name, |
374 | bond_dev->name); | |
454d7c9b | 375 | bond = netdev_priv(bond_dev); |
1da177e4 | 376 | rlb_update_entry_from_arp(bond, arp); |
5a03cdb7 | 377 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 LT |
378 | } |
379 | ||
380 | res = NET_RX_SUCCESS; | |
381 | ||
382 | out: | |
383 | dev_kfree_skb(skb); | |
384 | ||
385 | return res; | |
386 | } | |
387 | ||
388 | /* Caller must hold bond lock for read */ | |
389 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
390 | { | |
391 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
392 | struct slave *rx_slave, *slave, *start_at; | |
393 | int i = 0; | |
394 | ||
395 | if (bond_info->next_rx_slave) { | |
396 | start_at = bond_info->next_rx_slave; | |
397 | } else { | |
398 | start_at = bond->first_slave; | |
399 | } | |
400 | ||
401 | rx_slave = NULL; | |
402 | ||
403 | bond_for_each_slave_from(bond, slave, i, start_at) { | |
404 | if (SLAVE_IS_OK(slave)) { | |
405 | if (!rx_slave) { | |
406 | rx_slave = slave; | |
407 | } else if (slave->speed > rx_slave->speed) { | |
408 | rx_slave = slave; | |
409 | } | |
410 | } | |
411 | } | |
412 | ||
413 | if (rx_slave) { | |
414 | bond_info->next_rx_slave = rx_slave->next; | |
415 | } | |
416 | ||
417 | return rx_slave; | |
418 | } | |
419 | ||
420 | /* teach the switch the mac of a disabled slave | |
421 | * on the primary for fault tolerance | |
422 | * | |
423 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
424 | */ | |
425 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
426 | { | |
427 | if (!bond->curr_active_slave) { | |
428 | return; | |
429 | } | |
430 | ||
431 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
432 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
433 | bond->alb_info.primary_is_promisc = 1; | |
434 | else | |
435 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
436 | } |
437 | ||
438 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
439 | ||
440 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
441 | } | |
442 | ||
443 | /* slave being removed should not be active at this point | |
444 | * | |
445 | * Caller must hold bond lock for read | |
446 | */ | |
447 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
448 | { | |
449 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
450 | struct rlb_client_info *rx_hash_table; | |
451 | u32 index, next_index; | |
452 | ||
453 | /* clear slave from rx_hashtbl */ | |
454 | _lock_rx_hashtbl(bond); | |
455 | ||
456 | rx_hash_table = bond_info->rx_hashtbl; | |
457 | index = bond_info->rx_hashtbl_head; | |
458 | for (; index != RLB_NULL_INDEX; index = next_index) { | |
459 | next_index = rx_hash_table[index].next; | |
460 | if (rx_hash_table[index].slave == slave) { | |
461 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
462 | ||
463 | if (assigned_slave) { | |
464 | rx_hash_table[index].slave = assigned_slave; | |
465 | if (memcmp(rx_hash_table[index].mac_dst, | |
466 | mac_bcast, ETH_ALEN)) { | |
467 | bond_info->rx_hashtbl[index].ntt = 1; | |
468 | bond_info->rx_ntt = 1; | |
469 | /* A slave has been removed from the | |
470 | * table because it is either disabled | |
471 | * or being released. We must retry the | |
472 | * update to avoid clients from not | |
473 | * being updated & disconnecting when | |
474 | * there is stress | |
475 | */ | |
476 | bond_info->rlb_update_retry_counter = | |
477 | RLB_UPDATE_RETRY; | |
478 | } | |
479 | } else { /* there is no active slave */ | |
480 | rx_hash_table[index].slave = NULL; | |
481 | } | |
482 | } | |
483 | } | |
484 | ||
485 | _unlock_rx_hashtbl(bond); | |
486 | ||
6603a6f2 | 487 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
488 | |
489 | if (slave != bond->curr_active_slave) { | |
490 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
491 | } | |
492 | ||
6603a6f2 | 493 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
494 | } |
495 | ||
496 | static void rlb_update_client(struct rlb_client_info *client_info) | |
497 | { | |
498 | int i; | |
499 | ||
500 | if (!client_info->slave) { | |
501 | return; | |
502 | } | |
503 | ||
504 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
505 | struct sk_buff *skb; | |
506 | ||
507 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
508 | client_info->ip_dst, | |
509 | client_info->slave->dev, | |
510 | client_info->ip_src, | |
511 | client_info->mac_dst, | |
512 | client_info->slave->dev->dev_addr, | |
513 | client_info->mac_dst); | |
514 | if (!skb) { | |
515 | printk(KERN_ERR DRV_NAME | |
4e0952c7 MW |
516 | ": %s: Error: failed to create an ARP packet\n", |
517 | client_info->slave->dev->master->name); | |
1da177e4 LT |
518 | continue; |
519 | } | |
520 | ||
521 | skb->dev = client_info->slave->dev; | |
522 | ||
523 | if (client_info->tag) { | |
524 | skb = vlan_put_tag(skb, client_info->vlan_id); | |
525 | if (!skb) { | |
526 | printk(KERN_ERR DRV_NAME | |
4e0952c7 MW |
527 | ": %s: Error: failed to insert VLAN tag\n", |
528 | client_info->slave->dev->master->name); | |
1da177e4 LT |
529 | continue; |
530 | } | |
531 | } | |
532 | ||
533 | arp_xmit(skb); | |
534 | } | |
535 | } | |
536 | ||
537 | /* sends ARP REPLIES that update the clients that need updating */ | |
538 | static void rlb_update_rx_clients(struct bonding *bond) | |
539 | { | |
540 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
541 | struct rlb_client_info *client_info; | |
542 | u32 hash_index; | |
543 | ||
544 | _lock_rx_hashtbl(bond); | |
545 | ||
546 | hash_index = bond_info->rx_hashtbl_head; | |
547 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
548 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
549 | if (client_info->ntt) { | |
550 | rlb_update_client(client_info); | |
551 | if (bond_info->rlb_update_retry_counter == 0) { | |
552 | client_info->ntt = 0; | |
553 | } | |
554 | } | |
555 | } | |
556 | ||
557 | /* do not update the entries again untill this counter is zero so that | |
558 | * not to confuse the clients. | |
559 | */ | |
560 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
561 | ||
562 | _unlock_rx_hashtbl(bond); | |
563 | } | |
564 | ||
565 | /* The slave was assigned a new mac address - update the clients */ | |
566 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
567 | { | |
568 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
569 | struct rlb_client_info *client_info; | |
570 | int ntt = 0; | |
571 | u32 hash_index; | |
572 | ||
573 | _lock_rx_hashtbl(bond); | |
574 | ||
575 | hash_index = bond_info->rx_hashtbl_head; | |
576 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
577 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
578 | ||
579 | if ((client_info->slave == slave) && | |
580 | memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) { | |
581 | client_info->ntt = 1; | |
582 | ntt = 1; | |
583 | } | |
584 | } | |
585 | ||
586 | // update the team's flag only after the whole iteration | |
587 | if (ntt) { | |
588 | bond_info->rx_ntt = 1; | |
589 | //fasten the change | |
590 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
591 | } | |
592 | ||
593 | _unlock_rx_hashtbl(bond); | |
594 | } | |
595 | ||
596 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 597 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
598 | { |
599 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
600 | struct rlb_client_info *client_info; | |
601 | u32 hash_index; | |
602 | ||
603 | _lock_rx_hashtbl(bond); | |
604 | ||
605 | hash_index = bond_info->rx_hashtbl_head; | |
606 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
607 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
608 | ||
609 | if (!client_info->slave) { | |
610 | printk(KERN_ERR DRV_NAME | |
4e0952c7 MW |
611 | ": %s: Error: found a client with no channel in " |
612 | "the client's hash table\n", | |
613 | bond->dev->name); | |
1da177e4 LT |
614 | continue; |
615 | } | |
616 | /*update all clients using this src_ip, that are not assigned | |
617 | * to the team's address (curr_active_slave) and have a known | |
618 | * unicast mac address. | |
619 | */ | |
620 | if ((client_info->ip_src == src_ip) && | |
621 | memcmp(client_info->slave->dev->dev_addr, | |
622 | bond->dev->dev_addr, ETH_ALEN) && | |
623 | memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) { | |
624 | client_info->ntt = 1; | |
625 | bond_info->rx_ntt = 1; | |
626 | } | |
627 | } | |
628 | ||
629 | _unlock_rx_hashtbl(bond); | |
630 | } | |
631 | ||
632 | /* Caller must hold both bond and ptr locks for read */ | |
633 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
634 | { | |
635 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 636 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
637 | struct slave *assigned_slave; |
638 | struct rlb_client_info *client_info; | |
639 | u32 hash_index = 0; | |
640 | ||
641 | _lock_rx_hashtbl(bond); | |
642 | ||
643 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src)); | |
644 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
645 | ||
646 | if (client_info->assigned) { | |
647 | if ((client_info->ip_src == arp->ip_src) && | |
648 | (client_info->ip_dst == arp->ip_dst)) { | |
649 | /* the entry is already assigned to this client */ | |
650 | if (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) { | |
651 | /* update mac address from arp */ | |
652 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
653 | } | |
654 | ||
655 | assigned_slave = client_info->slave; | |
656 | if (assigned_slave) { | |
657 | _unlock_rx_hashtbl(bond); | |
658 | return assigned_slave; | |
659 | } | |
660 | } else { | |
661 | /* the entry is already assigned to some other client, | |
662 | * move the old client to primary (curr_active_slave) so | |
663 | * that the new client can be assigned to this entry. | |
664 | */ | |
665 | if (bond->curr_active_slave && | |
666 | client_info->slave != bond->curr_active_slave) { | |
667 | client_info->slave = bond->curr_active_slave; | |
668 | rlb_update_client(client_info); | |
669 | } | |
670 | } | |
671 | } | |
672 | /* assign a new slave */ | |
673 | assigned_slave = rlb_next_rx_slave(bond); | |
674 | ||
675 | if (assigned_slave) { | |
676 | client_info->ip_src = arp->ip_src; | |
677 | client_info->ip_dst = arp->ip_dst; | |
678 | /* arp->mac_dst is broadcast for arp reqeusts. | |
679 | * will be updated with clients actual unicast mac address | |
680 | * upon receiving an arp reply. | |
681 | */ | |
682 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
683 | client_info->slave = assigned_slave; | |
684 | ||
685 | if (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) { | |
686 | client_info->ntt = 1; | |
687 | bond->alb_info.rx_ntt = 1; | |
688 | } else { | |
689 | client_info->ntt = 0; | |
690 | } | |
691 | ||
692 | if (!list_empty(&bond->vlan_list)) { | |
966bc6f4 | 693 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
1da177e4 | 694 | client_info->tag = 1; |
1da177e4 LT |
695 | } |
696 | ||
697 | if (!client_info->assigned) { | |
698 | u32 prev_tbl_head = bond_info->rx_hashtbl_head; | |
699 | bond_info->rx_hashtbl_head = hash_index; | |
700 | client_info->next = prev_tbl_head; | |
701 | if (prev_tbl_head != RLB_NULL_INDEX) { | |
702 | bond_info->rx_hashtbl[prev_tbl_head].prev = | |
703 | hash_index; | |
704 | } | |
705 | client_info->assigned = 1; | |
706 | } | |
707 | } | |
708 | ||
709 | _unlock_rx_hashtbl(bond); | |
710 | ||
711 | return assigned_slave; | |
712 | } | |
713 | ||
714 | /* chooses (and returns) transmit channel for arp reply | |
715 | * does not choose channel for other arp types since they are | |
716 | * sent on the curr_active_slave | |
717 | */ | |
718 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
719 | { | |
a16aeb36 | 720 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
721 | struct slave *tx_slave = NULL; |
722 | ||
f14c4e4e | 723 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
724 | /* the arp must be sent on the selected |
725 | * rx channel | |
726 | */ | |
727 | tx_slave = rlb_choose_channel(skb, bond); | |
728 | if (tx_slave) { | |
729 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
730 | } | |
5a03cdb7 | 731 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 732 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
733 | /* Create an entry in the rx_hashtbl for this client as a |
734 | * place holder. | |
735 | * When the arp reply is received the entry will be updated | |
736 | * with the correct unicast address of the client. | |
737 | */ | |
738 | rlb_choose_channel(skb, bond); | |
739 | ||
740 | /* The ARP relpy packets must be delayed so that | |
741 | * they can cancel out the influence of the ARP request. | |
742 | */ | |
743 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
744 | ||
745 | /* arp requests are broadcast and are sent on the primary | |
746 | * the arp request will collapse all clients on the subnet to | |
747 | * the primary slave. We must register these clients to be | |
748 | * updated with their assigned mac. | |
749 | */ | |
750 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 751 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
752 | } |
753 | ||
754 | return tx_slave; | |
755 | } | |
756 | ||
757 | /* Caller must hold bond lock for read */ | |
758 | static void rlb_rebalance(struct bonding *bond) | |
759 | { | |
760 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
761 | struct slave *assigned_slave; | |
762 | struct rlb_client_info *client_info; | |
763 | int ntt; | |
764 | u32 hash_index; | |
765 | ||
766 | _lock_rx_hashtbl(bond); | |
767 | ||
768 | ntt = 0; | |
769 | hash_index = bond_info->rx_hashtbl_head; | |
770 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
771 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
772 | assigned_slave = rlb_next_rx_slave(bond); | |
773 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
774 | client_info->slave = assigned_slave; | |
775 | client_info->ntt = 1; | |
776 | ntt = 1; | |
777 | } | |
778 | } | |
779 | ||
780 | /* update the team's flag only after the whole iteration */ | |
781 | if (ntt) { | |
782 | bond_info->rx_ntt = 1; | |
783 | } | |
784 | _unlock_rx_hashtbl(bond); | |
785 | } | |
786 | ||
787 | /* Caller must hold rx_hashtbl lock */ | |
788 | static void rlb_init_table_entry(struct rlb_client_info *entry) | |
789 | { | |
790 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
791 | entry->next = RLB_NULL_INDEX; | |
792 | entry->prev = RLB_NULL_INDEX; | |
793 | } | |
794 | ||
795 | static int rlb_initialize(struct bonding *bond) | |
796 | { | |
797 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
798 | struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type); | |
0d206a3a | 799 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
800 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
801 | int i; | |
802 | ||
803 | spin_lock_init(&(bond_info->rx_hashtbl_lock)); | |
804 | ||
0d206a3a MW |
805 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
806 | if (!new_hashtbl) { | |
1da177e4 | 807 | printk(KERN_ERR DRV_NAME |
4e0952c7 | 808 | ": %s: Error: Failed to allocate RLB hash table\n", |
1da177e4 | 809 | bond->dev->name); |
1da177e4 LT |
810 | return -1; |
811 | } | |
0d206a3a MW |
812 | _lock_rx_hashtbl(bond); |
813 | ||
814 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 LT |
815 | |
816 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
817 | ||
818 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
819 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
820 | } | |
821 | ||
822 | _unlock_rx_hashtbl(bond); | |
823 | ||
824 | /*initialize packet type*/ | |
09640e63 | 825 | pk_type->type = cpu_to_be16(ETH_P_ARP); |
6146b1a4 | 826 | pk_type->dev = NULL; |
1da177e4 LT |
827 | pk_type->func = rlb_arp_recv; |
828 | ||
829 | /* register to receive ARPs */ | |
830 | dev_add_pack(pk_type); | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
835 | static void rlb_deinitialize(struct bonding *bond) | |
836 | { | |
837 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
838 | ||
839 | dev_remove_pack(&(bond_info->rlb_pkt_type)); | |
840 | ||
841 | _lock_rx_hashtbl(bond); | |
842 | ||
843 | kfree(bond_info->rx_hashtbl); | |
844 | bond_info->rx_hashtbl = NULL; | |
845 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
846 | ||
847 | _unlock_rx_hashtbl(bond); | |
848 | } | |
849 | ||
850 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
851 | { | |
852 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
853 | u32 curr_index; | |
854 | ||
855 | _lock_rx_hashtbl(bond); | |
856 | ||
857 | curr_index = bond_info->rx_hashtbl_head; | |
858 | while (curr_index != RLB_NULL_INDEX) { | |
859 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
860 | u32 next_index = bond_info->rx_hashtbl[curr_index].next; | |
861 | u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; | |
862 | ||
863 | if (curr->tag && (curr->vlan_id == vlan_id)) { | |
864 | if (curr_index == bond_info->rx_hashtbl_head) { | |
865 | bond_info->rx_hashtbl_head = next_index; | |
866 | } | |
867 | if (prev_index != RLB_NULL_INDEX) { | |
868 | bond_info->rx_hashtbl[prev_index].next = next_index; | |
869 | } | |
870 | if (next_index != RLB_NULL_INDEX) { | |
871 | bond_info->rx_hashtbl[next_index].prev = prev_index; | |
872 | } | |
873 | ||
874 | rlb_init_table_entry(curr); | |
875 | } | |
876 | ||
877 | curr_index = next_index; | |
878 | } | |
879 | ||
880 | _unlock_rx_hashtbl(bond); | |
881 | } | |
882 | ||
883 | /*********************** tlb/rlb shared functions *********************/ | |
884 | ||
885 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) | |
886 | { | |
887 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
888 | struct learning_pkt pkt; | |
889 | int size = sizeof(struct learning_pkt); | |
890 | int i; | |
891 | ||
892 | memset(&pkt, 0, size); | |
893 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
894 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 895 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 LT |
896 | |
897 | for (i = 0; i < MAX_LP_BURST; i++) { | |
898 | struct sk_buff *skb; | |
899 | char *data; | |
900 | ||
901 | skb = dev_alloc_skb(size); | |
902 | if (!skb) { | |
903 | return; | |
904 | } | |
905 | ||
906 | data = skb_put(skb, size); | |
907 | memcpy(data, &pkt, size); | |
908 | ||
459a98ed | 909 | skb_reset_mac_header(skb); |
b0e380b1 | 910 | skb->network_header = skb->mac_header + ETH_HLEN; |
1da177e4 LT |
911 | skb->protocol = pkt.type; |
912 | skb->priority = TC_PRIO_CONTROL; | |
913 | skb->dev = slave->dev; | |
914 | ||
915 | if (!list_empty(&bond->vlan_list)) { | |
916 | struct vlan_entry *vlan; | |
917 | ||
918 | vlan = bond_next_vlan(bond, | |
919 | bond->alb_info.current_alb_vlan); | |
920 | ||
921 | bond->alb_info.current_alb_vlan = vlan; | |
922 | if (!vlan) { | |
923 | kfree_skb(skb); | |
924 | continue; | |
925 | } | |
926 | ||
927 | skb = vlan_put_tag(skb, vlan->vlan_id); | |
928 | if (!skb) { | |
929 | printk(KERN_ERR DRV_NAME | |
4e0952c7 MW |
930 | ": %s: Error: failed to insert VLAN tag\n", |
931 | bond->dev->name); | |
1da177e4 LT |
932 | continue; |
933 | } | |
934 | } | |
935 | ||
936 | dev_queue_xmit(skb); | |
937 | } | |
938 | } | |
939 | ||
940 | /* hw is a boolean parameter that determines whether we should try and | |
941 | * set the hw address of the device as well as the hw address of the | |
942 | * net_device | |
943 | */ | |
944 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw) | |
945 | { | |
946 | struct net_device *dev = slave->dev; | |
947 | struct sockaddr s_addr; | |
948 | ||
949 | if (!hw) { | |
950 | memcpy(dev->dev_addr, addr, dev->addr_len); | |
951 | return 0; | |
952 | } | |
953 | ||
954 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
955 | /* each slave will receive packets destined to a different mac */ | |
956 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
957 | s_addr.sa_family = dev->type; | |
958 | if (dev_set_mac_address(dev, &s_addr)) { | |
959 | printk(KERN_ERR DRV_NAME | |
4e0952c7 | 960 | ": %s: Error: dev_set_mac_address of dev %s failed! ALB " |
1da177e4 LT |
961 | "mode requires that the base driver support setting " |
962 | "the hw address also when the network device's " | |
963 | "interface is open\n", | |
4e0952c7 | 964 | dev->master->name, dev->name); |
1da177e4 LT |
965 | return -EOPNOTSUPP; |
966 | } | |
967 | return 0; | |
968 | } | |
969 | ||
059fe7a5 JV |
970 | /* |
971 | * Swap MAC addresses between two slaves. | |
972 | * | |
973 | * Called with RTNL held, and no other locks. | |
974 | * | |
975 | */ | |
976 | ||
1da177e4 LT |
977 | static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2) |
978 | { | |
1da177e4 | 979 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
980 | |
981 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
982 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled); | |
983 | alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled); | |
984 | ||
059fe7a5 JV |
985 | } |
986 | ||
987 | /* | |
988 | * Send learning packets after MAC address swap. | |
989 | * | |
2543331d | 990 | * Called with RTNL and no other locks |
059fe7a5 JV |
991 | */ |
992 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
993 | struct slave *slave2) | |
994 | { | |
995 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
996 | struct slave *disabled_slave = NULL; | |
997 | ||
2543331d JV |
998 | ASSERT_RTNL(); |
999 | ||
1da177e4 LT |
1000 | /* fasten the change in the switch */ |
1001 | if (SLAVE_IS_OK(slave1)) { | |
1002 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
1003 | if (bond->alb_info.rlb_enabled) { | |
1004 | /* inform the clients that the mac address | |
1005 | * has changed | |
1006 | */ | |
1007 | rlb_req_update_slave_clients(bond, slave1); | |
1008 | } | |
1009 | } else { | |
1010 | disabled_slave = slave1; | |
1011 | } | |
1012 | ||
1013 | if (SLAVE_IS_OK(slave2)) { | |
1014 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
1015 | if (bond->alb_info.rlb_enabled) { | |
1016 | /* inform the clients that the mac address | |
1017 | * has changed | |
1018 | */ | |
1019 | rlb_req_update_slave_clients(bond, slave2); | |
1020 | } | |
1021 | } else { | |
1022 | disabled_slave = slave2; | |
1023 | } | |
1024 | ||
1025 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1026 | /* A disabled slave was assigned an active mac addr */ | |
1027 | rlb_teach_disabled_mac_on_primary(bond, | |
1028 | disabled_slave->dev->dev_addr); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * alb_change_hw_addr_on_detach | |
1034 | * @bond: bonding we're working on | |
1035 | * @slave: the slave that was just detached | |
1036 | * | |
1037 | * We assume that @slave was already detached from the slave list. | |
1038 | * | |
1039 | * If @slave's permanent hw address is different both from its current | |
1040 | * address and from @bond's address, then somewhere in the bond there's | |
1041 | * a slave that has @slave's permanet address as its current address. | |
1042 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1043 | * | |
2543331d | 1044 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1045 | */ |
1046 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1047 | { | |
1048 | int perm_curr_diff; | |
1049 | int perm_bond_diff; | |
1050 | ||
1051 | perm_curr_diff = memcmp(slave->perm_hwaddr, | |
1052 | slave->dev->dev_addr, | |
1053 | ETH_ALEN); | |
1054 | perm_bond_diff = memcmp(slave->perm_hwaddr, | |
1055 | bond->dev->dev_addr, | |
1056 | ETH_ALEN); | |
1057 | ||
1058 | if (perm_curr_diff && perm_bond_diff) { | |
1059 | struct slave *tmp_slave; | |
1060 | int i, found = 0; | |
1061 | ||
1062 | bond_for_each_slave(bond, tmp_slave, i) { | |
1063 | if (!memcmp(slave->perm_hwaddr, | |
1064 | tmp_slave->dev->dev_addr, | |
1065 | ETH_ALEN)) { | |
1066 | found = 1; | |
1067 | break; | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | if (found) { | |
059fe7a5 | 1072 | /* locking: needs RTNL and nothing else */ |
1da177e4 | 1073 | alb_swap_mac_addr(bond, slave, tmp_slave); |
059fe7a5 | 1074 | alb_fasten_mac_swap(bond, slave, tmp_slave); |
1da177e4 LT |
1075 | } |
1076 | } | |
1077 | } | |
1078 | ||
1079 | /** | |
1080 | * alb_handle_addr_collision_on_attach | |
1081 | * @bond: bonding we're working on | |
1082 | * @slave: the slave that was just attached | |
1083 | * | |
1084 | * checks uniqueness of slave's mac address and handles the case the | |
1085 | * new slave uses the bonds mac address. | |
1086 | * | |
1087 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1088 | * find a different hw address to give @slave, that isn't in use by any other | |
1089 | * slave in the bond. This address must be, of course, one of the premanent | |
1090 | * addresses of the other slaves. | |
1091 | * | |
1092 | * We go over the slave list, and for each slave there we compare its | |
1093 | * permanent hw address with the current address of all the other slaves. | |
1094 | * If no match was found, then we've found a slave with a permanent address | |
1095 | * that isn't used by any other slave in the bond, so we can assign it to | |
1096 | * @slave. | |
1097 | * | |
1098 | * assumption: this function is called before @slave is attached to the | |
1099 | * bond slave list. | |
1100 | * | |
1101 | * caller must hold the bond lock for write since the mac addresses are compared | |
1102 | * and may be swapped. | |
1103 | */ | |
1104 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1105 | { | |
1106 | struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; | |
1107 | struct slave *has_bond_addr = bond->curr_active_slave; | |
1108 | int i, j, found = 0; | |
1109 | ||
1110 | if (bond->slave_cnt == 0) { | |
1111 | /* this is the first slave */ | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | /* if slave's mac address differs from bond's mac address | |
1116 | * check uniqueness of slave's mac address against the other | |
1117 | * slaves in the bond. | |
1118 | */ | |
1119 | if (memcmp(slave->perm_hwaddr, bond->dev->dev_addr, ETH_ALEN)) { | |
1120 | bond_for_each_slave(bond, tmp_slave1, i) { | |
1121 | if (!memcmp(tmp_slave1->dev->dev_addr, slave->dev->dev_addr, | |
1122 | ETH_ALEN)) { | |
1123 | found = 1; | |
1124 | break; | |
1125 | } | |
1126 | } | |
1127 | ||
6b38aefe JL |
1128 | if (!found) |
1129 | return 0; | |
1da177e4 | 1130 | |
6b38aefe JL |
1131 | /* Try setting slave mac to bond address and fall-through |
1132 | to code handling that situation below... */ | |
1133 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr, | |
1134 | bond->alb_info.rlb_enabled); | |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | /* The slave's address is equal to the address of the bond. | |
1138 | * Search for a spare address in the bond for this slave. | |
1139 | */ | |
1140 | free_mac_slave = NULL; | |
1141 | ||
1142 | bond_for_each_slave(bond, tmp_slave1, i) { | |
1143 | found = 0; | |
1144 | bond_for_each_slave(bond, tmp_slave2, j) { | |
1145 | if (!memcmp(tmp_slave1->perm_hwaddr, | |
1146 | tmp_slave2->dev->dev_addr, | |
1147 | ETH_ALEN)) { | |
1148 | found = 1; | |
1149 | break; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | if (!found) { | |
1154 | /* no slave has tmp_slave1's perm addr | |
1155 | * as its curr addr | |
1156 | */ | |
1157 | free_mac_slave = tmp_slave1; | |
1158 | break; | |
1159 | } | |
1160 | ||
1161 | if (!has_bond_addr) { | |
1162 | if (!memcmp(tmp_slave1->dev->dev_addr, | |
1163 | bond->dev->dev_addr, | |
1164 | ETH_ALEN)) { | |
1165 | ||
1166 | has_bond_addr = tmp_slave1; | |
1167 | } | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | if (free_mac_slave) { | |
1172 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, | |
1173 | bond->alb_info.rlb_enabled); | |
1174 | ||
1175 | printk(KERN_WARNING DRV_NAME | |
4e0952c7 | 1176 | ": %s: Warning: the hw address of slave %s is in use by " |
1da177e4 | 1177 | "the bond; giving it the hw address of %s\n", |
4e0952c7 | 1178 | bond->dev->name, slave->dev->name, free_mac_slave->dev->name); |
1da177e4 LT |
1179 | |
1180 | } else if (has_bond_addr) { | |
1181 | printk(KERN_ERR DRV_NAME | |
4e0952c7 | 1182 | ": %s: Error: the hw address of slave %s is in use by the " |
1da177e4 LT |
1183 | "bond; couldn't find a slave with a free hw address to " |
1184 | "give it (this should not have happened)\n", | |
4e0952c7 | 1185 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1186 | return -EFAULT; |
1187 | } | |
1188 | ||
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | /** | |
1193 | * alb_set_mac_address | |
1194 | * @bond: | |
1195 | * @addr: | |
1196 | * | |
1197 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1198 | * their dev_addr field to different addresses (based on their permanent hw | |
1199 | * addresses). | |
1200 | * | |
1201 | * For each slave, this function sets the interface to the new address and then | |
1202 | * changes its dev_addr field to its previous value. | |
1203 | * | |
1204 | * Unwinding assumes bond's mac address has not yet changed. | |
1205 | */ | |
1206 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1207 | { | |
1208 | struct sockaddr sa; | |
1209 | struct slave *slave, *stop_at; | |
1210 | char tmp_addr[ETH_ALEN]; | |
1211 | int res; | |
1212 | int i; | |
1213 | ||
1214 | if (bond->alb_info.rlb_enabled) { | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | bond_for_each_slave(bond, slave, i) { | |
1da177e4 LT |
1219 | /* save net_device's current hw address */ |
1220 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1221 | ||
1222 | res = dev_set_mac_address(slave->dev, addr); | |
1223 | ||
1224 | /* restore net_device's hw address */ | |
1225 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1226 | ||
eb7cc59a | 1227 | if (res) |
1da177e4 | 1228 | goto unwind; |
1da177e4 LT |
1229 | } |
1230 | ||
1231 | return 0; | |
1232 | ||
1233 | unwind: | |
1234 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1235 | sa.sa_family = bond->dev->type; | |
1236 | ||
1237 | /* unwind from head to the slave that failed */ | |
1238 | stop_at = slave; | |
1239 | bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { | |
1240 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1241 | dev_set_mac_address(slave->dev, &sa); | |
1242 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1243 | } | |
1244 | ||
1245 | return res; | |
1246 | } | |
1247 | ||
1248 | /************************ exported alb funcions ************************/ | |
1249 | ||
1250 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1251 | { | |
1252 | int res; | |
1253 | ||
1254 | res = tlb_initialize(bond); | |
1255 | if (res) { | |
1256 | return res; | |
1257 | } | |
1258 | ||
1259 | if (rlb_enabled) { | |
1260 | bond->alb_info.rlb_enabled = 1; | |
1261 | /* initialize rlb */ | |
1262 | res = rlb_initialize(bond); | |
1263 | if (res) { | |
1264 | tlb_deinitialize(bond); | |
1265 | return res; | |
1266 | } | |
b76850ab MW |
1267 | } else { |
1268 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1269 | } |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | void bond_alb_deinitialize(struct bonding *bond) | |
1275 | { | |
1276 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1277 | ||
1278 | tlb_deinitialize(bond); | |
1279 | ||
1280 | if (bond_info->rlb_enabled) { | |
1281 | rlb_deinitialize(bond); | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1286 | { | |
454d7c9b | 1287 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1288 | struct ethhdr *eth_data; |
1289 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1290 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1291 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1292 | int hash_size = 0; |
1293 | int do_tx_balance = 1; | |
1294 | u32 hash_index = 0; | |
eddc9ec5 | 1295 | const u8 *hash_start = NULL; |
1da177e4 | 1296 | int res = 1; |
2d1ea19d | 1297 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1298 | |
459a98ed | 1299 | skb_reset_mac_header(skb); |
1da177e4 LT |
1300 | eth_data = eth_hdr(skb); |
1301 | ||
1302 | /* make sure that the curr_active_slave and the slaves list do | |
1303 | * not change during tx | |
1304 | */ | |
1305 | read_lock(&bond->lock); | |
1306 | read_lock(&bond->curr_slave_lock); | |
1307 | ||
1308 | if (!BOND_IS_OK(bond)) { | |
1309 | goto out; | |
1310 | } | |
1311 | ||
1312 | switch (ntohs(skb->protocol)) { | |
eddc9ec5 ACM |
1313 | case ETH_P_IP: { |
1314 | const struct iphdr *iph = ip_hdr(skb); | |
1315 | ||
1da177e4 | 1316 | if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) || |
eddc9ec5 ACM |
1317 | (iph->daddr == ip_bcast) || |
1318 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1319 | do_tx_balance = 0; |
1320 | break; | |
1321 | } | |
eddc9ec5 ACM |
1322 | hash_start = (char *)&(iph->daddr); |
1323 | hash_size = sizeof(iph->daddr); | |
1324 | } | |
1da177e4 LT |
1325 | break; |
1326 | case ETH_P_IPV6: | |
2d1ea19d VY |
1327 | /* IPv6 doesn't really use broadcast mac address, but leave |
1328 | * that here just in case. | |
1329 | */ | |
1da177e4 LT |
1330 | if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) { |
1331 | do_tx_balance = 0; | |
1332 | break; | |
2d1ea19d VY |
1333 | } |
1334 | ||
1335 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1336 | * broadcasts in IPv4. | |
1337 | */ | |
1338 | if (memcmp(eth_data->h_dest, mac_v6_allmcast, ETH_ALEN) == 0) { | |
1339 | do_tx_balance = 0; | |
1340 | break; | |
1341 | } | |
1342 | ||
1343 | /* Additianally, DAD probes should not be tx-balanced as that | |
1344 | * will lead to false positives for duplicate addresses and | |
1345 | * prevent address configuration from working. | |
1346 | */ | |
1347 | ip6hdr = ipv6_hdr(skb); | |
1348 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1349 | do_tx_balance = 0; | |
1350 | break; | |
1da177e4 LT |
1351 | } |
1352 | ||
0660e03f ACM |
1353 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1354 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1355 | break; |
1356 | case ETH_P_IPX: | |
d3bb52b0 | 1357 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1358 | /* something is wrong with this packet */ |
1359 | do_tx_balance = 0; | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1364 | /* The only protocol worth balancing in | |
1365 | * this family since it has an "ARP" like | |
1366 | * mechanism | |
1367 | */ | |
1368 | do_tx_balance = 0; | |
1369 | break; | |
1370 | } | |
1371 | ||
1372 | hash_start = (char*)eth_data->h_dest; | |
1373 | hash_size = ETH_ALEN; | |
1374 | break; | |
1375 | case ETH_P_ARP: | |
1376 | do_tx_balance = 0; | |
1377 | if (bond_info->rlb_enabled) { | |
1378 | tx_slave = rlb_arp_xmit(skb, bond); | |
1379 | } | |
1380 | break; | |
1381 | default: | |
1382 | do_tx_balance = 0; | |
1383 | break; | |
1384 | } | |
1385 | ||
1386 | if (do_tx_balance) { | |
1387 | hash_index = _simple_hash(hash_start, hash_size); | |
1388 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1389 | } | |
1390 | ||
1391 | if (!tx_slave) { | |
1392 | /* unbalanced or unassigned, send through primary */ | |
1393 | tx_slave = bond->curr_active_slave; | |
1394 | bond_info->unbalanced_load += skb->len; | |
1395 | } | |
1396 | ||
1397 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
1398 | if (tx_slave != bond->curr_active_slave) { | |
1399 | memcpy(eth_data->h_source, | |
1400 | tx_slave->dev->dev_addr, | |
1401 | ETH_ALEN); | |
1402 | } | |
1403 | ||
1404 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1405 | } else { | |
1406 | if (tx_slave) { | |
1407 | tlb_clear_slave(bond, tx_slave, 0); | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | out: | |
1412 | if (res) { | |
1413 | /* no suitable interface, frame not sent */ | |
1414 | dev_kfree_skb(skb); | |
1415 | } | |
1416 | read_unlock(&bond->curr_slave_lock); | |
1417 | read_unlock(&bond->lock); | |
1418 | return 0; | |
1419 | } | |
1420 | ||
1b76b316 | 1421 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1422 | { |
1b76b316 JV |
1423 | struct bonding *bond = container_of(work, struct bonding, |
1424 | alb_work.work); | |
1da177e4 LT |
1425 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
1426 | struct slave *slave; | |
1427 | int i; | |
1428 | ||
1429 | read_lock(&bond->lock); | |
1430 | ||
1431 | if (bond->kill_timers) { | |
1432 | goto out; | |
1433 | } | |
1434 | ||
1435 | if (bond->slave_cnt == 0) { | |
1436 | bond_info->tx_rebalance_counter = 0; | |
1437 | bond_info->lp_counter = 0; | |
1438 | goto re_arm; | |
1439 | } | |
1440 | ||
1441 | bond_info->tx_rebalance_counter++; | |
1442 | bond_info->lp_counter++; | |
1443 | ||
1444 | /* send learning packets */ | |
1445 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) { | |
1446 | /* change of curr_active_slave involves swapping of mac addresses. | |
1447 | * in order to avoid this swapping from happening while | |
1448 | * sending the learning packets, the curr_slave_lock must be held for | |
1449 | * read. | |
1450 | */ | |
1451 | read_lock(&bond->curr_slave_lock); | |
1452 | ||
1453 | bond_for_each_slave(bond, slave, i) { | |
e944ef79 | 1454 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1455 | } |
1456 | ||
1457 | read_unlock(&bond->curr_slave_lock); | |
1458 | ||
1459 | bond_info->lp_counter = 0; | |
1460 | } | |
1461 | ||
1462 | /* rebalance tx traffic */ | |
1463 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1464 | ||
1465 | read_lock(&bond->curr_slave_lock); | |
1466 | ||
1467 | bond_for_each_slave(bond, slave, i) { | |
1468 | tlb_clear_slave(bond, slave, 1); | |
1469 | if (slave == bond->curr_active_slave) { | |
1470 | SLAVE_TLB_INFO(slave).load = | |
1471 | bond_info->unbalanced_load / | |
1472 | BOND_TLB_REBALANCE_INTERVAL; | |
1473 | bond_info->unbalanced_load = 0; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | read_unlock(&bond->curr_slave_lock); | |
1478 | ||
1479 | bond_info->tx_rebalance_counter = 0; | |
1480 | } | |
1481 | ||
1482 | /* handle rlb stuff */ | |
1483 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1484 | if (bond_info->primary_is_promisc && |
1485 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1486 | ||
d0e81b7e JV |
1487 | /* |
1488 | * dev_set_promiscuity requires rtnl and | |
1489 | * nothing else. | |
1490 | */ | |
1491 | read_unlock(&bond->lock); | |
1492 | rtnl_lock(); | |
1493 | ||
1da177e4 LT |
1494 | bond_info->rlb_promisc_timeout_counter = 0; |
1495 | ||
1496 | /* If the primary was set to promiscuous mode | |
1497 | * because a slave was disabled then | |
1498 | * it can now leave promiscuous mode. | |
1499 | */ | |
1500 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1501 | bond_info->primary_is_promisc = 0; | |
1da177e4 | 1502 | |
d0e81b7e JV |
1503 | rtnl_unlock(); |
1504 | read_lock(&bond->lock); | |
1505 | } | |
1da177e4 LT |
1506 | |
1507 | if (bond_info->rlb_rebalance) { | |
1508 | bond_info->rlb_rebalance = 0; | |
1509 | rlb_rebalance(bond); | |
1510 | } | |
1511 | ||
1512 | /* check if clients need updating */ | |
1513 | if (bond_info->rx_ntt) { | |
1514 | if (bond_info->rlb_update_delay_counter) { | |
1515 | --bond_info->rlb_update_delay_counter; | |
1516 | } else { | |
1517 | rlb_update_rx_clients(bond); | |
1518 | if (bond_info->rlb_update_retry_counter) { | |
1519 | --bond_info->rlb_update_retry_counter; | |
1520 | } else { | |
1521 | bond_info->rx_ntt = 0; | |
1522 | } | |
1523 | } | |
1524 | } | |
1525 | } | |
1526 | ||
1527 | re_arm: | |
1b76b316 | 1528 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1529 | out: |
1530 | read_unlock(&bond->lock); | |
1531 | } | |
1532 | ||
1533 | /* assumption: called before the slave is attached to the bond | |
1534 | * and not locked by the bond lock | |
1535 | */ | |
1536 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1537 | { | |
1538 | int res; | |
1539 | ||
1540 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, | |
1541 | bond->alb_info.rlb_enabled); | |
1542 | if (res) { | |
1543 | return res; | |
1544 | } | |
1545 | ||
1546 | /* caller must hold the bond lock for write since the mac addresses | |
1547 | * are compared and may be swapped. | |
1548 | */ | |
6603a6f2 | 1549 | read_lock(&bond->lock); |
1da177e4 LT |
1550 | |
1551 | res = alb_handle_addr_collision_on_attach(bond, slave); | |
1552 | ||
6603a6f2 | 1553 | read_unlock(&bond->lock); |
1da177e4 LT |
1554 | |
1555 | if (res) { | |
1556 | return res; | |
1557 | } | |
1558 | ||
1559 | tlb_init_slave(slave); | |
1560 | ||
1561 | /* order a rebalance ASAP */ | |
1562 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1563 | ||
1564 | if (bond->alb_info.rlb_enabled) { | |
1565 | bond->alb_info.rlb_rebalance = 1; | |
1566 | } | |
1567 | ||
1568 | return 0; | |
1569 | } | |
1570 | ||
2543331d JV |
1571 | /* |
1572 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1573 | * if necessary. | |
1574 | * | |
1575 | * Caller must hold RTNL and no other locks | |
1576 | */ | |
1da177e4 LT |
1577 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1578 | { | |
1579 | if (bond->slave_cnt > 1) { | |
1580 | alb_change_hw_addr_on_detach(bond, slave); | |
1581 | } | |
1582 | ||
1583 | tlb_clear_slave(bond, slave, 0); | |
1584 | ||
1585 | if (bond->alb_info.rlb_enabled) { | |
1586 | bond->alb_info.next_rx_slave = NULL; | |
1587 | rlb_clear_slave(bond, slave); | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | /* Caller must hold bond lock for read */ | |
1592 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1593 | { | |
1594 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1595 | ||
1596 | if (link == BOND_LINK_DOWN) { | |
1597 | tlb_clear_slave(bond, slave, 0); | |
1598 | if (bond->alb_info.rlb_enabled) { | |
1599 | rlb_clear_slave(bond, slave); | |
1600 | } | |
1601 | } else if (link == BOND_LINK_UP) { | |
1602 | /* order a rebalance ASAP */ | |
1603 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1604 | if (bond->alb_info.rlb_enabled) { | |
1605 | bond->alb_info.rlb_rebalance = 1; | |
1606 | /* If the updelay module parameter is smaller than the | |
1607 | * forwarding delay of the switch the rebalance will | |
1608 | * not work because the rebalance arp replies will | |
1609 | * not be forwarded to the clients.. | |
1610 | */ | |
1611 | } | |
1612 | } | |
1613 | } | |
1614 | ||
1615 | /** | |
1616 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1617 | * @bond: our bonding struct | |
1618 | * @new_slave: new slave to assign | |
1619 | * | |
1620 | * Set the bond->curr_active_slave to @new_slave and handle | |
1621 | * mac address swapping and promiscuity changes as needed. | |
1622 | * | |
059fe7a5 JV |
1623 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1624 | * bond->lock for write. | |
1625 | * | |
1626 | * If new_slave is not NULL, caller must hold RTNL, bond->lock for | |
1627 | * read and curr_slave_lock for write. Processing here may sleep, so | |
1628 | * no other locks may be held. | |
1da177e4 LT |
1629 | */ |
1630 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1631 | { | |
1632 | struct slave *swap_slave; | |
1633 | int i; | |
1634 | ||
1635 | if (bond->curr_active_slave == new_slave) { | |
1636 | return; | |
1637 | } | |
1638 | ||
1639 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1640 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1641 | bond->alb_info.primary_is_promisc = 0; | |
1642 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1643 | } | |
1644 | ||
1645 | swap_slave = bond->curr_active_slave; | |
1646 | bond->curr_active_slave = new_slave; | |
1647 | ||
1648 | if (!new_slave || (bond->slave_cnt == 0)) { | |
1649 | return; | |
1650 | } | |
1651 | ||
1652 | /* set the new curr_active_slave to the bonds mac address | |
1653 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1654 | */ | |
1655 | if (!swap_slave) { | |
1656 | struct slave *tmp_slave; | |
1657 | /* find slave that is holding the bond's mac address */ | |
1658 | bond_for_each_slave(bond, tmp_slave, i) { | |
1659 | if (!memcmp(tmp_slave->dev->dev_addr, | |
1660 | bond->dev->dev_addr, ETH_ALEN)) { | |
1661 | swap_slave = tmp_slave; | |
1662 | break; | |
1663 | } | |
1664 | } | |
1665 | } | |
1666 | ||
059fe7a5 JV |
1667 | /* |
1668 | * Arrange for swap_slave and new_slave to temporarily be | |
1669 | * ignored so we can mess with their MAC addresses without | |
1670 | * fear of interference from transmit activity. | |
1671 | */ | |
1672 | if (swap_slave) { | |
1673 | tlb_clear_slave(bond, swap_slave, 1); | |
1674 | } | |
1675 | tlb_clear_slave(bond, new_slave, 1); | |
1676 | ||
1677 | write_unlock_bh(&bond->curr_slave_lock); | |
1678 | read_unlock(&bond->lock); | |
1679 | ||
e0138a66 JV |
1680 | ASSERT_RTNL(); |
1681 | ||
1da177e4 LT |
1682 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1683 | if (swap_slave) { | |
1684 | /* swap mac address */ | |
1685 | alb_swap_mac_addr(bond, swap_slave, new_slave); | |
1686 | } else { | |
1687 | /* set the new_slave to the bond mac address */ | |
1688 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, | |
1689 | bond->alb_info.rlb_enabled); | |
059fe7a5 JV |
1690 | } |
1691 | ||
059fe7a5 JV |
1692 | if (swap_slave) { |
1693 | alb_fasten_mac_swap(bond, swap_slave, new_slave); | |
2543331d | 1694 | read_lock(&bond->lock); |
059fe7a5 | 1695 | } else { |
2543331d | 1696 | read_lock(&bond->lock); |
1da177e4 LT |
1697 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1698 | } | |
059fe7a5 JV |
1699 | |
1700 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1701 | } |
1702 | ||
059fe7a5 JV |
1703 | /* |
1704 | * Called with RTNL | |
1705 | */ | |
1da177e4 LT |
1706 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1707 | { | |
454d7c9b | 1708 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1709 | struct sockaddr *sa = addr; |
1710 | struct slave *slave, *swap_slave; | |
1711 | int res; | |
1712 | int i; | |
1713 | ||
1714 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1715 | return -EADDRNOTAVAIL; | |
1716 | } | |
1717 | ||
1718 | res = alb_set_mac_address(bond, addr); | |
1719 | if (res) { | |
1720 | return res; | |
1721 | } | |
1722 | ||
1723 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1724 | ||
1725 | /* If there is no curr_active_slave there is nothing else to do. | |
1726 | * Otherwise we'll need to pass the new address to it and handle | |
1727 | * duplications. | |
1728 | */ | |
1729 | if (!bond->curr_active_slave) { | |
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | swap_slave = NULL; | |
1734 | ||
1735 | bond_for_each_slave(bond, slave, i) { | |
1736 | if (!memcmp(slave->dev->dev_addr, bond_dev->dev_addr, ETH_ALEN)) { | |
1737 | swap_slave = slave; | |
1738 | break; | |
1739 | } | |
1740 | } | |
1741 | ||
059fe7a5 JV |
1742 | write_unlock_bh(&bond->curr_slave_lock); |
1743 | read_unlock(&bond->lock); | |
1744 | ||
1da177e4 LT |
1745 | if (swap_slave) { |
1746 | alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave); | |
059fe7a5 | 1747 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 LT |
1748 | } else { |
1749 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr, | |
1750 | bond->alb_info.rlb_enabled); | |
1751 | ||
1752 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); | |
1753 | if (bond->alb_info.rlb_enabled) { | |
1754 | /* inform clients mac address has changed */ | |
1755 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1756 | } | |
1757 | } | |
1758 | ||
059fe7a5 JV |
1759 | read_lock(&bond->lock); |
1760 | write_lock_bh(&bond->curr_slave_lock); | |
1761 | ||
1da177e4 LT |
1762 | return 0; |
1763 | } | |
1764 | ||
1765 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1766 | { | |
1767 | if (bond->alb_info.current_alb_vlan && | |
1768 | (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) { | |
1769 | bond->alb_info.current_alb_vlan = NULL; | |
1770 | } | |
1771 | ||
1772 | if (bond->alb_info.rlb_enabled) { | |
1773 | rlb_clear_vlan(bond, vlan_id); | |
1774 | } | |
1775 | } | |
1776 |