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 | ||
a4aee5c8 JP |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
1da177e4 LT |
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> | |
2d1ea19d | 41 | #include <net/ipv6.h> |
1da177e4 LT |
42 | #include <asm/byteorder.h> |
43 | #include "bonding.h" | |
44 | #include "bond_alb.h" | |
45 | ||
46 | ||
1da177e4 | 47 | |
885a136c ED |
48 | #ifndef __long_aligned |
49 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
50 | #endif | |
51 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
52 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
53 | }; | |
54 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
55 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
56 | }; | |
1da177e4 LT |
57 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
58 | ||
59 | #pragma pack(1) | |
60 | struct learning_pkt { | |
61 | u8 mac_dst[ETH_ALEN]; | |
62 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 63 | __be16 type; |
1da177e4 LT |
64 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
65 | }; | |
66 | ||
67 | struct arp_pkt { | |
d3bb52b0 AV |
68 | __be16 hw_addr_space; |
69 | __be16 prot_addr_space; | |
1da177e4 LT |
70 | u8 hw_addr_len; |
71 | u8 prot_addr_len; | |
d3bb52b0 | 72 | __be16 op_code; |
1da177e4 | 73 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 74 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 75 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 76 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
77 | }; |
78 | #pragma pack() | |
79 | ||
a16aeb36 ACM |
80 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
81 | { | |
d56f90a7 | 82 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
83 | } |
84 | ||
1da177e4 LT |
85 | /* Forward declaration */ |
86 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); | |
e53665c6 JB |
87 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
88 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
89 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
90 | u32 ip_dst_hash); | |
1da177e4 | 91 | |
eddc9ec5 | 92 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
93 | { |
94 | int i; | |
95 | u8 hash = 0; | |
96 | ||
97 | for (i = 0; i < hash_size; i++) { | |
98 | hash ^= hash_start[i]; | |
99 | } | |
100 | ||
101 | return hash; | |
102 | } | |
103 | ||
104 | /*********************** tlb specific functions ***************************/ | |
105 | ||
f515e6b7 | 106 | static inline void _lock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 107 | { |
6603a6f2 | 108 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
109 | } |
110 | ||
f515e6b7 | 111 | static inline void _unlock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 112 | { |
6603a6f2 | 113 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
114 | } |
115 | ||
f515e6b7 MU |
116 | static inline void _lock_tx_hashtbl(struct bonding *bond) |
117 | { | |
118 | spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
119 | } | |
120 | ||
121 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
122 | { | |
123 | spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
124 | } | |
125 | ||
1da177e4 LT |
126 | /* Caller must hold tx_hashtbl lock */ |
127 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
128 | { | |
129 | if (save_load) { | |
130 | entry->load_history = 1 + entry->tx_bytes / | |
131 | BOND_TLB_REBALANCE_INTERVAL; | |
132 | entry->tx_bytes = 0; | |
133 | } | |
134 | ||
135 | entry->tx_slave = NULL; | |
136 | entry->next = TLB_NULL_INDEX; | |
137 | entry->prev = TLB_NULL_INDEX; | |
138 | } | |
139 | ||
140 | static inline void tlb_init_slave(struct slave *slave) | |
141 | { | |
142 | SLAVE_TLB_INFO(slave).load = 0; | |
143 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
144 | } | |
145 | ||
f515e6b7 MU |
146 | /* Caller must hold bond lock for read, BH disabled */ |
147 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
148 | int save_load) | |
1da177e4 LT |
149 | { |
150 | struct tlb_client_info *tx_hash_table; | |
151 | u32 index; | |
152 | ||
1da177e4 LT |
153 | /* clear slave from tx_hashtbl */ |
154 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
155 | ||
ce39a800 AG |
156 | /* skip this if we've already freed the tx hash table */ |
157 | if (tx_hash_table) { | |
158 | index = SLAVE_TLB_INFO(slave).head; | |
159 | while (index != TLB_NULL_INDEX) { | |
160 | u32 next_index = tx_hash_table[index].next; | |
161 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
162 | index = next_index; | |
163 | } | |
1da177e4 LT |
164 | } |
165 | ||
1da177e4 | 166 | tlb_init_slave(slave); |
f515e6b7 | 167 | } |
5af47b2f | 168 | |
f515e6b7 MU |
169 | /* Caller must hold bond lock for read */ |
170 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
171 | int save_load) | |
172 | { | |
173 | _lock_tx_hashtbl_bh(bond); | |
174 | __tlb_clear_slave(bond, slave, save_load); | |
175 | _unlock_tx_hashtbl_bh(bond); | |
1da177e4 LT |
176 | } |
177 | ||
178 | /* Must be called before starting the monitor timer */ | |
179 | static int tlb_initialize(struct bonding *bond) | |
180 | { | |
181 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
182 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 183 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
184 | int i; |
185 | ||
243cb4e5 | 186 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 187 | if (!new_hashtbl) |
1da177e4 | 188 | return -1; |
e404decb | 189 | |
f515e6b7 | 190 | _lock_tx_hashtbl_bh(bond); |
0d206a3a MW |
191 | |
192 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 193 | |
1da177e4 | 194 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { |
38dbaf0a | 195 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 LT |
196 | } |
197 | ||
f515e6b7 | 198 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
199 | |
200 | return 0; | |
201 | } | |
202 | ||
203 | /* Must be called only after all slaves have been released */ | |
204 | static void tlb_deinitialize(struct bonding *bond) | |
205 | { | |
206 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
207 | ||
f515e6b7 | 208 | _lock_tx_hashtbl_bh(bond); |
1da177e4 LT |
209 | |
210 | kfree(bond_info->tx_hashtbl); | |
211 | bond_info->tx_hashtbl = NULL; | |
212 | ||
f515e6b7 | 213 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
214 | } |
215 | ||
097811bb JP |
216 | static long long compute_gap(struct slave *slave) |
217 | { | |
218 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
219 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
220 | } | |
221 | ||
1da177e4 LT |
222 | /* Caller must hold bond lock for read */ |
223 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
224 | { | |
225 | struct slave *slave, *least_loaded; | |
097811bb | 226 | long long max_gap; |
1da177e4 | 227 | |
097811bb JP |
228 | least_loaded = NULL; |
229 | max_gap = LLONG_MIN; | |
1da177e4 LT |
230 | |
231 | /* Find the slave with the largest gap */ | |
dec1e90e | 232 | bond_for_each_slave(bond, slave) { |
1da177e4 | 233 | if (SLAVE_IS_OK(slave)) { |
097811bb JP |
234 | long long gap = compute_gap(slave); |
235 | ||
1da177e4 LT |
236 | if (max_gap < gap) { |
237 | least_loaded = slave; | |
238 | max_gap = gap; | |
239 | } | |
240 | } | |
241 | } | |
242 | ||
243 | return least_loaded; | |
244 | } | |
245 | ||
f515e6b7 MU |
246 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
247 | u32 skb_len) | |
1da177e4 LT |
248 | { |
249 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
250 | struct tlb_client_info *hash_table; | |
251 | struct slave *assigned_slave; | |
252 | ||
1da177e4 LT |
253 | hash_table = bond_info->tx_hashtbl; |
254 | assigned_slave = hash_table[hash_index].tx_slave; | |
255 | if (!assigned_slave) { | |
256 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
257 | ||
258 | if (assigned_slave) { | |
259 | struct tlb_slave_info *slave_info = | |
260 | &(SLAVE_TLB_INFO(assigned_slave)); | |
261 | u32 next_index = slave_info->head; | |
262 | ||
263 | hash_table[hash_index].tx_slave = assigned_slave; | |
264 | hash_table[hash_index].next = next_index; | |
265 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
266 | ||
267 | if (next_index != TLB_NULL_INDEX) { | |
268 | hash_table[next_index].prev = hash_index; | |
269 | } | |
270 | ||
271 | slave_info->head = hash_index; | |
272 | slave_info->load += | |
273 | hash_table[hash_index].load_history; | |
274 | } | |
275 | } | |
276 | ||
277 | if (assigned_slave) { | |
278 | hash_table[hash_index].tx_bytes += skb_len; | |
279 | } | |
280 | ||
1da177e4 LT |
281 | return assigned_slave; |
282 | } | |
283 | ||
f515e6b7 MU |
284 | /* Caller must hold bond lock for read */ |
285 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, | |
286 | u32 skb_len) | |
287 | { | |
288 | struct slave *tx_slave; | |
289 | /* | |
290 | * We don't need to disable softirq here, becase | |
291 | * tlb_choose_channel() is only called by bond_alb_xmit() | |
292 | * which already has softirq disabled. | |
293 | */ | |
294 | _lock_tx_hashtbl(bond); | |
295 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); | |
296 | _unlock_tx_hashtbl(bond); | |
297 | return tx_slave; | |
298 | } | |
299 | ||
1da177e4 | 300 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 301 | static inline void _lock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 302 | { |
6603a6f2 | 303 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
304 | } |
305 | ||
f515e6b7 | 306 | static inline void _unlock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 307 | { |
6603a6f2 | 308 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
309 | } |
310 | ||
f515e6b7 MU |
311 | static inline void _lock_rx_hashtbl(struct bonding *bond) |
312 | { | |
313 | spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
314 | } | |
315 | ||
316 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
317 | { | |
318 | spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
319 | } | |
320 | ||
1da177e4 LT |
321 | /* when an ARP REPLY is received from a client update its info |
322 | * in the rx_hashtbl | |
323 | */ | |
324 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
325 | { | |
326 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
327 | struct rlb_client_info *client_info; | |
328 | u32 hash_index; | |
329 | ||
f515e6b7 | 330 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
331 | |
332 | hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
333 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
334 | ||
335 | if ((client_info->assigned) && | |
336 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 337 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 338 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 LT |
339 | /* update the clients MAC address */ |
340 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
341 | client_info->ntt = 1; | |
342 | bond_info->rx_ntt = 1; | |
343 | } | |
344 | ||
f515e6b7 | 345 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
346 | } |
347 | ||
de063b70 ED |
348 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
349 | struct slave *slave) | |
1da177e4 | 350 | { |
de063b70 | 351 | struct arp_pkt *arp, _arp; |
1da177e4 | 352 | |
3aba891d | 353 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 354 | goto out; |
1da177e4 | 355 | |
de063b70 ED |
356 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
357 | if (!arp) | |
b99215cd | 358 | goto out; |
1da177e4 | 359 | |
e53665c6 JB |
360 | /* We received an ARP from arp->ip_src. |
361 | * We might have used this IP address previously (on the bonding host | |
362 | * itself or on a system that is bridged together with the bond). | |
363 | * However, if arp->mac_src is different than what is stored in | |
364 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
365 | * sending out client updates with this IP address and the old MAC | |
366 | * address. | |
367 | * Clean up all hash table entries that have this address as ip_src but | |
368 | * have a different mac_src. | |
369 | */ | |
370 | rlb_purge_src_ip(bond, arp); | |
371 | ||
1da177e4 LT |
372 | if (arp->op_code == htons(ARPOP_REPLY)) { |
373 | /* update rx hash table for this ARP */ | |
374 | rlb_update_entry_from_arp(bond, arp); | |
5a03cdb7 | 375 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 | 376 | } |
b99215cd DM |
377 | out: |
378 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
379 | } |
380 | ||
381 | /* Caller must hold bond lock for read */ | |
382 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
383 | { | |
384 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
385 | struct slave *rx_slave, *slave, *start_at; | |
386 | int i = 0; | |
387 | ||
dec1e90e | 388 | if (bond_info->next_rx_slave) |
1da177e4 | 389 | start_at = bond_info->next_rx_slave; |
dec1e90e | 390 | else |
391 | start_at = bond_first_slave(bond); | |
1da177e4 LT |
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) { | |
dec1e90e | 406 | slave = bond_next_slave(bond, rx_slave); |
407 | bond_info->next_rx_slave = slave; | |
1da177e4 LT |
408 | } |
409 | ||
410 | return rx_slave; | |
411 | } | |
412 | ||
413 | /* teach the switch the mac of a disabled slave | |
414 | * on the primary for fault tolerance | |
415 | * | |
416 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
417 | */ | |
418 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
419 | { | |
420 | if (!bond->curr_active_slave) { | |
421 | return; | |
422 | } | |
423 | ||
424 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
425 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
426 | bond->alb_info.primary_is_promisc = 1; | |
427 | else | |
428 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
429 | } |
430 | ||
431 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
432 | ||
433 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
434 | } | |
435 | ||
436 | /* slave being removed should not be active at this point | |
437 | * | |
438 | * Caller must hold bond lock for read | |
439 | */ | |
440 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
441 | { | |
442 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
443 | struct rlb_client_info *rx_hash_table; | |
444 | u32 index, next_index; | |
445 | ||
446 | /* clear slave from rx_hashtbl */ | |
f515e6b7 | 447 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
448 | |
449 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 450 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 451 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 452 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
453 | if (rx_hash_table[index].slave == slave) { |
454 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
455 | ||
456 | if (assigned_slave) { | |
457 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
458 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
459 | mac_bcast)) { | |
1da177e4 LT |
460 | bond_info->rx_hashtbl[index].ntt = 1; |
461 | bond_info->rx_ntt = 1; | |
462 | /* A slave has been removed from the | |
463 | * table because it is either disabled | |
464 | * or being released. We must retry the | |
465 | * update to avoid clients from not | |
466 | * being updated & disconnecting when | |
467 | * there is stress | |
468 | */ | |
469 | bond_info->rlb_update_retry_counter = | |
470 | RLB_UPDATE_RETRY; | |
471 | } | |
472 | } else { /* there is no active slave */ | |
473 | rx_hash_table[index].slave = NULL; | |
474 | } | |
475 | } | |
476 | } | |
477 | ||
f515e6b7 | 478 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 479 | |
6603a6f2 | 480 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
481 | |
482 | if (slave != bond->curr_active_slave) { | |
483 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
484 | } | |
485 | ||
6603a6f2 | 486 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
487 | } |
488 | ||
489 | static void rlb_update_client(struct rlb_client_info *client_info) | |
490 | { | |
491 | int i; | |
492 | ||
493 | if (!client_info->slave) { | |
494 | return; | |
495 | } | |
496 | ||
497 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
498 | struct sk_buff *skb; | |
499 | ||
500 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
501 | client_info->ip_dst, | |
502 | client_info->slave->dev, | |
503 | client_info->ip_src, | |
504 | client_info->mac_dst, | |
505 | client_info->slave->dev->dev_addr, | |
506 | client_info->mac_dst); | |
507 | if (!skb) { | |
a4aee5c8 | 508 | pr_err("%s: Error: failed to create an ARP packet\n", |
471cb5a3 | 509 | client_info->slave->bond->dev->name); |
1da177e4 LT |
510 | continue; |
511 | } | |
512 | ||
513 | skb->dev = client_info->slave->dev; | |
514 | ||
d3ab3ffd | 515 | if (client_info->vlan_id) { |
86a9bad3 | 516 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id); |
1da177e4 | 517 | if (!skb) { |
a4aee5c8 | 518 | pr_err("%s: Error: failed to insert VLAN tag\n", |
471cb5a3 | 519 | client_info->slave->bond->dev->name); |
1da177e4 LT |
520 | continue; |
521 | } | |
522 | } | |
523 | ||
524 | arp_xmit(skb); | |
525 | } | |
526 | } | |
527 | ||
528 | /* sends ARP REPLIES that update the clients that need updating */ | |
529 | static void rlb_update_rx_clients(struct bonding *bond) | |
530 | { | |
531 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
532 | struct rlb_client_info *client_info; | |
533 | u32 hash_index; | |
534 | ||
f515e6b7 | 535 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 536 | |
e53665c6 JB |
537 | hash_index = bond_info->rx_hashtbl_used_head; |
538 | for (; hash_index != RLB_NULL_INDEX; | |
539 | hash_index = client_info->used_next) { | |
1da177e4 LT |
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 | ||
94e2bd68 | 549 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
550 | * not to confuse the clients. |
551 | */ | |
552 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
553 | ||
f515e6b7 | 554 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
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 | ||
f515e6b7 | 565 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 566 | |
e53665c6 JB |
567 | hash_index = bond_info->rx_hashtbl_used_head; |
568 | for (; hash_index != RLB_NULL_INDEX; | |
569 | hash_index = client_info->used_next) { | |
1da177e4 LT |
570 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
571 | ||
572 | if ((client_info->slave == slave) && | |
a6700db1 | 573 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
574 | client_info->ntt = 1; |
575 | ntt = 1; | |
576 | } | |
577 | } | |
578 | ||
579 | // update the team's flag only after the whole iteration | |
580 | if (ntt) { | |
581 | bond_info->rx_ntt = 1; | |
582 | //fasten the change | |
583 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
584 | } | |
585 | ||
f515e6b7 | 586 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
587 | } |
588 | ||
589 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 590 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
591 | { |
592 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
593 | struct rlb_client_info *client_info; | |
594 | u32 hash_index; | |
595 | ||
596 | _lock_rx_hashtbl(bond); | |
597 | ||
e53665c6 JB |
598 | hash_index = bond_info->rx_hashtbl_used_head; |
599 | for (; hash_index != RLB_NULL_INDEX; | |
600 | hash_index = client_info->used_next) { | |
1da177e4 LT |
601 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
602 | ||
603 | if (!client_info->slave) { | |
a4aee5c8 | 604 | pr_err("%s: Error: found a client with no channel in the client's hash table\n", |
4e0952c7 | 605 | bond->dev->name); |
1da177e4 LT |
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) && | |
a6700db1 JP |
613 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
614 | bond->dev->dev_addr) && | |
615 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
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)); | |
a16aeb36 | 628 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
629 | struct slave *assigned_slave; |
630 | struct rlb_client_info *client_info; | |
631 | u32 hash_index = 0; | |
632 | ||
633 | _lock_rx_hashtbl(bond); | |
634 | ||
e364a341 | 635 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
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 */ | |
a6700db1 | 642 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
643 | /* update mac address from arp */ |
644 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
645 | } | |
e53665c6 | 646 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
647 | |
648 | assigned_slave = client_info->slave; | |
649 | if (assigned_slave) { | |
650 | _unlock_rx_hashtbl(bond); | |
651 | return assigned_slave; | |
652 | } | |
653 | } else { | |
654 | /* the entry is already assigned to some other client, | |
655 | * move the old client to primary (curr_active_slave) so | |
656 | * that the new client can be assigned to this entry. | |
657 | */ | |
658 | if (bond->curr_active_slave && | |
659 | client_info->slave != bond->curr_active_slave) { | |
660 | client_info->slave = bond->curr_active_slave; | |
661 | rlb_update_client(client_info); | |
662 | } | |
663 | } | |
664 | } | |
665 | /* assign a new slave */ | |
666 | assigned_slave = rlb_next_rx_slave(bond); | |
667 | ||
668 | if (assigned_slave) { | |
e53665c6 JB |
669 | if (!(client_info->assigned && |
670 | client_info->ip_src == arp->ip_src)) { | |
671 | /* ip_src is going to be updated, | |
672 | * fix the src hash list | |
673 | */ | |
674 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
675 | sizeof(arp->ip_src)); | |
676 | rlb_src_unlink(bond, hash_index); | |
677 | rlb_src_link(bond, hash_src, hash_index); | |
678 | } | |
679 | ||
1da177e4 LT |
680 | client_info->ip_src = arp->ip_src; |
681 | client_info->ip_dst = arp->ip_dst; | |
682 | /* arp->mac_dst is broadcast for arp reqeusts. | |
683 | * will be updated with clients actual unicast mac address | |
684 | * upon receiving an arp reply. | |
685 | */ | |
686 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
e53665c6 | 687 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
688 | client_info->slave = assigned_slave; |
689 | ||
a6700db1 | 690 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
691 | client_info->ntt = 1; |
692 | bond->alb_info.rx_ntt = 1; | |
693 | } else { | |
694 | client_info->ntt = 0; | |
695 | } | |
696 | ||
6f477d42 | 697 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 698 | client_info->vlan_id = 0; |
1da177e4 LT |
699 | |
700 | if (!client_info->assigned) { | |
e53665c6 JB |
701 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
702 | bond_info->rx_hashtbl_used_head = hash_index; | |
703 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 704 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 705 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
706 | hash_index; |
707 | } | |
708 | client_info->assigned = 1; | |
709 | } | |
710 | } | |
711 | ||
712 | _unlock_rx_hashtbl(bond); | |
713 | ||
714 | return assigned_slave; | |
715 | } | |
716 | ||
717 | /* chooses (and returns) transmit channel for arp reply | |
718 | * does not choose channel for other arp types since they are | |
719 | * sent on the curr_active_slave | |
720 | */ | |
721 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
722 | { | |
a16aeb36 | 723 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
724 | struct slave *tx_slave = NULL; |
725 | ||
567b871e | 726 | /* Don't modify or load balance ARPs that do not originate locally |
727 | * (e.g.,arrive via a bridge). | |
728 | */ | |
729 | if (!bond_slave_has_mac(bond, arp->mac_src)) | |
730 | return NULL; | |
731 | ||
f14c4e4e | 732 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
733 | /* the arp must be sent on the selected |
734 | * rx channel | |
735 | */ | |
736 | tx_slave = rlb_choose_channel(skb, bond); | |
737 | if (tx_slave) { | |
738 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
739 | } | |
5a03cdb7 | 740 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 741 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
742 | /* Create an entry in the rx_hashtbl for this client as a |
743 | * place holder. | |
744 | * When the arp reply is received the entry will be updated | |
745 | * with the correct unicast address of the client. | |
746 | */ | |
747 | rlb_choose_channel(skb, bond); | |
748 | ||
77c8e2c0 | 749 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
750 | * they can cancel out the influence of the ARP request. |
751 | */ | |
752 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
753 | ||
754 | /* arp requests are broadcast and are sent on the primary | |
755 | * the arp request will collapse all clients on the subnet to | |
756 | * the primary slave. We must register these clients to be | |
757 | * updated with their assigned mac. | |
758 | */ | |
759 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 760 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
761 | } |
762 | ||
763 | return tx_slave; | |
764 | } | |
765 | ||
766 | /* Caller must hold bond lock for read */ | |
767 | static void rlb_rebalance(struct bonding *bond) | |
768 | { | |
769 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
770 | struct slave *assigned_slave; | |
771 | struct rlb_client_info *client_info; | |
772 | int ntt; | |
773 | u32 hash_index; | |
774 | ||
f515e6b7 | 775 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
776 | |
777 | ntt = 0; | |
e53665c6 JB |
778 | hash_index = bond_info->rx_hashtbl_used_head; |
779 | for (; hash_index != RLB_NULL_INDEX; | |
780 | hash_index = client_info->used_next) { | |
1da177e4 LT |
781 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
782 | assigned_slave = rlb_next_rx_slave(bond); | |
783 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
784 | client_info->slave = assigned_slave; | |
785 | client_info->ntt = 1; | |
786 | ntt = 1; | |
787 | } | |
788 | } | |
789 | ||
790 | /* update the team's flag only after the whole iteration */ | |
791 | if (ntt) { | |
792 | bond_info->rx_ntt = 1; | |
793 | } | |
f515e6b7 | 794 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
795 | } |
796 | ||
797 | /* Caller must hold rx_hashtbl lock */ | |
e53665c6 JB |
798 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
799 | { | |
800 | entry->used_next = RLB_NULL_INDEX; | |
801 | entry->used_prev = RLB_NULL_INDEX; | |
802 | entry->assigned = 0; | |
803 | entry->slave = NULL; | |
d3ab3ffd | 804 | entry->vlan_id = 0; |
e53665c6 JB |
805 | } |
806 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
807 | { | |
808 | entry->src_first = RLB_NULL_INDEX; | |
809 | entry->src_prev = RLB_NULL_INDEX; | |
810 | entry->src_next = RLB_NULL_INDEX; | |
811 | } | |
812 | ||
1da177e4 LT |
813 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
814 | { | |
815 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
816 | rlb_init_table_entry_dst(entry); |
817 | rlb_init_table_entry_src(entry); | |
818 | } | |
819 | ||
820 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
821 | { | |
822 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
823 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
824 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
825 | ||
826 | if (index == bond_info->rx_hashtbl_used_head) | |
827 | bond_info->rx_hashtbl_used_head = next_index; | |
828 | if (prev_index != RLB_NULL_INDEX) | |
829 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
830 | if (next_index != RLB_NULL_INDEX) | |
831 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
832 | } | |
833 | ||
834 | /* unlink a rlb hash table entry from the src list */ | |
835 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
836 | { | |
837 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
838 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
839 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
840 | ||
841 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
842 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
843 | ||
844 | if (next_index != RLB_NULL_INDEX) | |
845 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
846 | ||
847 | if (prev_index == RLB_NULL_INDEX) | |
848 | return; | |
849 | ||
850 | /* is prev_index pointing to the head of this list? */ | |
851 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
852 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
853 | else | |
854 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
855 | ||
856 | } | |
857 | ||
858 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
859 | { | |
860 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
861 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
862 | ||
863 | rlb_delete_table_entry_dst(bond, index); | |
864 | rlb_init_table_entry_dst(entry); | |
865 | ||
866 | rlb_src_unlink(bond, index); | |
867 | } | |
868 | ||
869 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
870 | * of entries with identical ip_src_hash | |
871 | */ | |
872 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
873 | { | |
874 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
875 | u32 next; | |
876 | ||
877 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
878 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
879 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
880 | if (next != RLB_NULL_INDEX) | |
881 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
882 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
883 | } | |
884 | ||
885 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does | |
886 | * not match arp->mac_src */ | |
887 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) | |
888 | { | |
889 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
890 | u32 ip_src_hash = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
891 | u32 index; | |
892 | ||
893 | _lock_rx_hashtbl_bh(bond); | |
894 | ||
895 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
896 | while (index != RLB_NULL_INDEX) { | |
897 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
898 | u32 next_index = entry->src_next; | |
899 | if (entry->ip_src == arp->ip_src && | |
900 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
901 | rlb_delete_table_entry(bond, index); | |
902 | index = next_index; | |
903 | } | |
904 | _unlock_rx_hashtbl_bh(bond); | |
1da177e4 LT |
905 | } |
906 | ||
907 | static int rlb_initialize(struct bonding *bond) | |
908 | { | |
909 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 910 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
911 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
912 | int i; | |
913 | ||
0d206a3a | 914 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 915 | if (!new_hashtbl) |
1da177e4 | 916 | return -1; |
e404decb | 917 | |
f515e6b7 | 918 | _lock_rx_hashtbl_bh(bond); |
0d206a3a MW |
919 | |
920 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 921 | |
e53665c6 | 922 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 LT |
923 | |
924 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
925 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
926 | } | |
927 | ||
f515e6b7 | 928 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 929 | |
1da177e4 | 930 | /* register to receive ARPs */ |
3aba891d | 931 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
932 | |
933 | return 0; | |
934 | } | |
935 | ||
936 | static void rlb_deinitialize(struct bonding *bond) | |
937 | { | |
938 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
939 | ||
f515e6b7 | 940 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
941 | |
942 | kfree(bond_info->rx_hashtbl); | |
943 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 944 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 945 | |
f515e6b7 | 946 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
947 | } |
948 | ||
949 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
950 | { | |
951 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
952 | u32 curr_index; | |
953 | ||
f515e6b7 | 954 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 955 | |
e53665c6 | 956 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
957 | while (curr_index != RLB_NULL_INDEX) { |
958 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 959 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 960 | |
d3ab3ffd | 961 | if (curr->vlan_id == vlan_id) |
e53665c6 | 962 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
963 | |
964 | curr_index = next_index; | |
965 | } | |
966 | ||
f515e6b7 | 967 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
968 | } |
969 | ||
970 | /*********************** tlb/rlb shared functions *********************/ | |
971 | ||
7aa64981 VF |
972 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
973 | u16 vid) | |
1da177e4 | 974 | { |
1da177e4 | 975 | struct learning_pkt pkt; |
7aa64981 | 976 | struct sk_buff *skb; |
1da177e4 | 977 | int size = sizeof(struct learning_pkt); |
7aa64981 | 978 | char *data; |
1da177e4 LT |
979 | |
980 | memset(&pkt, 0, size); | |
981 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
982 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 983 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 | 984 | |
7aa64981 VF |
985 | skb = dev_alloc_skb(size); |
986 | if (!skb) | |
987 | return; | |
1da177e4 | 988 | |
7aa64981 VF |
989 | data = skb_put(skb, size); |
990 | memcpy(data, &pkt, size); | |
991 | ||
992 | skb_reset_mac_header(skb); | |
993 | skb->network_header = skb->mac_header + ETH_HLEN; | |
994 | skb->protocol = pkt.type; | |
995 | skb->priority = TC_PRIO_CONTROL; | |
996 | skb->dev = slave->dev; | |
997 | ||
998 | if (vid) { | |
999 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vid); | |
1da177e4 | 1000 | if (!skb) { |
7aa64981 VF |
1001 | pr_err("%s: Error: failed to insert VLAN tag\n", |
1002 | slave->bond->dev->name); | |
1da177e4 LT |
1003 | return; |
1004 | } | |
7aa64981 VF |
1005 | } |
1006 | ||
1007 | dev_queue_xmit(skb); | |
1008 | } | |
1da177e4 | 1009 | |
1da177e4 | 1010 | |
7aa64981 VF |
1011 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) |
1012 | { | |
1013 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
5bf94b83 VF |
1014 | struct net_device *upper; |
1015 | struct list_head *iter; | |
1016 | ||
1017 | /* send untagged */ | |
1018 | alb_send_lp_vid(slave, mac_addr, 0); | |
1019 | ||
1020 | /* loop through vlans and send one packet for each */ | |
1021 | rcu_read_lock(); | |
1022 | netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) { | |
1023 | if (upper->priv_flags & IFF_802_1Q_VLAN) | |
1024 | alb_send_lp_vid(slave, mac_addr, | |
1025 | vlan_dev_vlan_id(upper)); | |
1da177e4 | 1026 | } |
5bf94b83 | 1027 | rcu_read_unlock(); |
1da177e4 LT |
1028 | } |
1029 | ||
b924551b | 1030 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
1031 | { |
1032 | struct net_device *dev = slave->dev; | |
1033 | struct sockaddr s_addr; | |
1034 | ||
b924551b | 1035 | if (slave->bond->params.mode == BOND_MODE_TLB) { |
1da177e4 LT |
1036 | memcpy(dev->dev_addr, addr, dev->addr_len); |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
1041 | /* each slave will receive packets destined to a different mac */ | |
1042 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
1043 | s_addr.sa_family = dev->type; | |
1044 | if (dev_set_mac_address(dev, &s_addr)) { | |
a4aee5c8 JP |
1045 | pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n" |
1046 | "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", | |
471cb5a3 | 1047 | slave->bond->dev->name, dev->name); |
1da177e4 LT |
1048 | return -EOPNOTSUPP; |
1049 | } | |
1050 | return 0; | |
1051 | } | |
1052 | ||
059fe7a5 JV |
1053 | /* |
1054 | * Swap MAC addresses between two slaves. | |
1055 | * | |
1056 | * Called with RTNL held, and no other locks. | |
1057 | * | |
1058 | */ | |
1059 | ||
43547ea6 | 1060 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1061 | { |
1da177e4 | 1062 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
1063 | |
1064 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
b924551b JB |
1065 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
1066 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 1067 | |
059fe7a5 JV |
1068 | } |
1069 | ||
1070 | /* | |
1071 | * Send learning packets after MAC address swap. | |
1072 | * | |
2543331d | 1073 | * Called with RTNL and no other locks |
059fe7a5 JV |
1074 | */ |
1075 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1076 | struct slave *slave2) | |
1077 | { | |
1078 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
1079 | struct slave *disabled_slave = NULL; | |
1080 | ||
2543331d JV |
1081 | ASSERT_RTNL(); |
1082 | ||
1da177e4 LT |
1083 | /* fasten the change in the switch */ |
1084 | if (SLAVE_IS_OK(slave1)) { | |
1085 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
1086 | if (bond->alb_info.rlb_enabled) { | |
1087 | /* inform the clients that the mac address | |
1088 | * has changed | |
1089 | */ | |
1090 | rlb_req_update_slave_clients(bond, slave1); | |
1091 | } | |
1092 | } else { | |
1093 | disabled_slave = slave1; | |
1094 | } | |
1095 | ||
1096 | if (SLAVE_IS_OK(slave2)) { | |
1097 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
1098 | if (bond->alb_info.rlb_enabled) { | |
1099 | /* inform the clients that the mac address | |
1100 | * has changed | |
1101 | */ | |
1102 | rlb_req_update_slave_clients(bond, slave2); | |
1103 | } | |
1104 | } else { | |
1105 | disabled_slave = slave2; | |
1106 | } | |
1107 | ||
1108 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1109 | /* A disabled slave was assigned an active mac addr */ | |
1110 | rlb_teach_disabled_mac_on_primary(bond, | |
1111 | disabled_slave->dev->dev_addr); | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * alb_change_hw_addr_on_detach | |
1117 | * @bond: bonding we're working on | |
1118 | * @slave: the slave that was just detached | |
1119 | * | |
1120 | * We assume that @slave was already detached from the slave list. | |
1121 | * | |
1122 | * If @slave's permanent hw address is different both from its current | |
1123 | * address and from @bond's address, then somewhere in the bond there's | |
1124 | * a slave that has @slave's permanet address as its current address. | |
1125 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1126 | * | |
2543331d | 1127 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1128 | */ |
1129 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1130 | { | |
1131 | int perm_curr_diff; | |
1132 | int perm_bond_diff; | |
b88ec38d | 1133 | struct slave *found_slave; |
1da177e4 | 1134 | |
a6700db1 JP |
1135 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1136 | slave->dev->dev_addr); | |
1137 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1138 | bond->dev->dev_addr); | |
1da177e4 LT |
1139 | |
1140 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1141 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1142 | |
b88ec38d | 1143 | if (found_slave) { |
059fe7a5 | 1144 | /* locking: needs RTNL and nothing else */ |
b88ec38d VF |
1145 | alb_swap_mac_addr(slave, found_slave); |
1146 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1147 | } |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /** | |
1152 | * alb_handle_addr_collision_on_attach | |
1153 | * @bond: bonding we're working on | |
1154 | * @slave: the slave that was just attached | |
1155 | * | |
1156 | * checks uniqueness of slave's mac address and handles the case the | |
1157 | * new slave uses the bonds mac address. | |
1158 | * | |
1159 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1160 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1161 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1162 | * addresses of the other slaves. |
1163 | * | |
1164 | * We go over the slave list, and for each slave there we compare its | |
1165 | * permanent hw address with the current address of all the other slaves. | |
1166 | * If no match was found, then we've found a slave with a permanent address | |
1167 | * that isn't used by any other slave in the bond, so we can assign it to | |
1168 | * @slave. | |
1169 | * | |
1170 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1171 | * bond slave list. |
1da177e4 LT |
1172 | */ |
1173 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1174 | { | |
cedb743f | 1175 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1da177e4 | 1176 | struct slave *has_bond_addr = bond->curr_active_slave; |
1da177e4 | 1177 | |
dec1e90e | 1178 | if (list_empty(&bond->slave_list)) { |
1da177e4 LT |
1179 | /* this is the first slave */ |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | /* if slave's mac address differs from bond's mac address | |
1184 | * check uniqueness of slave's mac address against the other | |
1185 | * slaves in the bond. | |
1186 | */ | |
a6700db1 | 1187 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1188 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1189 | return 0; |
1da177e4 | 1190 | |
6b38aefe JL |
1191 | /* Try setting slave mac to bond address and fall-through |
1192 | to code handling that situation below... */ | |
b924551b | 1193 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1194 | } |
1195 | ||
1196 | /* The slave's address is equal to the address of the bond. | |
1197 | * Search for a spare address in the bond for this slave. | |
1198 | */ | |
dec1e90e | 1199 | bond_for_each_slave(bond, tmp_slave1) { |
cedb743f | 1200 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1201 | /* no slave has tmp_slave1's perm addr |
1202 | * as its curr addr | |
1203 | */ | |
1204 | free_mac_slave = tmp_slave1; | |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | if (!has_bond_addr) { | |
a6700db1 JP |
1209 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1210 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1211 | |
1212 | has_bond_addr = tmp_slave1; | |
1213 | } | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | if (free_mac_slave) { | |
b924551b | 1218 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1219 | |
a4aee5c8 | 1220 | pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n", |
e5e2a8fd JP |
1221 | bond->dev->name, slave->dev->name, |
1222 | free_mac_slave->dev->name); | |
1da177e4 LT |
1223 | |
1224 | } else if (has_bond_addr) { | |
a4aee5c8 | 1225 | pr_err("%s: Error: the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n", |
4e0952c7 | 1226 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1227 | return -EFAULT; |
1228 | } | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | /** | |
1234 | * alb_set_mac_address | |
1235 | * @bond: | |
1236 | * @addr: | |
1237 | * | |
1238 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1239 | * their dev_addr field to different addresses (based on their permanent hw | |
1240 | * addresses). | |
1241 | * | |
1242 | * For each slave, this function sets the interface to the new address and then | |
1243 | * changes its dev_addr field to its previous value. | |
1244 | * | |
1245 | * Unwinding assumes bond's mac address has not yet changed. | |
1246 | */ | |
1247 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1248 | { | |
1da177e4 | 1249 | char tmp_addr[ETH_ALEN]; |
dec1e90e | 1250 | struct slave *slave; |
1251 | struct sockaddr sa; | |
1da177e4 | 1252 | int res; |
1da177e4 | 1253 | |
dec1e90e | 1254 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1255 | return 0; |
1da177e4 | 1256 | |
dec1e90e | 1257 | bond_for_each_slave(bond, slave) { |
1da177e4 LT |
1258 | /* save net_device's current hw address */ |
1259 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1260 | ||
1261 | res = dev_set_mac_address(slave->dev, addr); | |
1262 | ||
1263 | /* restore net_device's hw address */ | |
1264 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1265 | ||
eb7cc59a | 1266 | if (res) |
1da177e4 | 1267 | goto unwind; |
1da177e4 LT |
1268 | } |
1269 | ||
1270 | return 0; | |
1271 | ||
1272 | unwind: | |
1273 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1274 | sa.sa_family = bond->dev->type; | |
1275 | ||
1276 | /* unwind from head to the slave that failed */ | |
dec1e90e | 1277 | bond_for_each_slave_continue_reverse(bond, slave) { |
1da177e4 LT |
1278 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); |
1279 | dev_set_mac_address(slave->dev, &sa); | |
1280 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1281 | } | |
1282 | ||
1283 | return res; | |
1284 | } | |
1285 | ||
1286 | /************************ exported alb funcions ************************/ | |
1287 | ||
1288 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1289 | { | |
1290 | int res; | |
1291 | ||
1292 | res = tlb_initialize(bond); | |
1293 | if (res) { | |
1294 | return res; | |
1295 | } | |
1296 | ||
1297 | if (rlb_enabled) { | |
1298 | bond->alb_info.rlb_enabled = 1; | |
1299 | /* initialize rlb */ | |
1300 | res = rlb_initialize(bond); | |
1301 | if (res) { | |
1302 | tlb_deinitialize(bond); | |
1303 | return res; | |
1304 | } | |
b76850ab MW |
1305 | } else { |
1306 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | void bond_alb_deinitialize(struct bonding *bond) | |
1313 | { | |
1314 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1315 | ||
1316 | tlb_deinitialize(bond); | |
1317 | ||
1318 | if (bond_info->rlb_enabled) { | |
1319 | rlb_deinitialize(bond); | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1324 | { | |
454d7c9b | 1325 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1326 | struct ethhdr *eth_data; |
1327 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1328 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1329 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1330 | int hash_size = 0; |
1331 | int do_tx_balance = 1; | |
1332 | u32 hash_index = 0; | |
eddc9ec5 | 1333 | const u8 *hash_start = NULL; |
1da177e4 | 1334 | int res = 1; |
2d1ea19d | 1335 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1336 | |
459a98ed | 1337 | skb_reset_mac_header(skb); |
1da177e4 LT |
1338 | eth_data = eth_hdr(skb); |
1339 | ||
0693e88e | 1340 | /* make sure that the curr_active_slave do not change during tx |
1da177e4 | 1341 | */ |
278b2083 | 1342 | read_lock(&bond->lock); |
1da177e4 LT |
1343 | read_lock(&bond->curr_slave_lock); |
1344 | ||
1da177e4 | 1345 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1346 | case ETH_P_IP: { |
1347 | const struct iphdr *iph = ip_hdr(skb); | |
1348 | ||
a6700db1 | 1349 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1350 | (iph->daddr == ip_bcast) || |
1351 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1352 | do_tx_balance = 0; |
1353 | break; | |
1354 | } | |
eddc9ec5 ACM |
1355 | hash_start = (char *)&(iph->daddr); |
1356 | hash_size = sizeof(iph->daddr); | |
1357 | } | |
1da177e4 LT |
1358 | break; |
1359 | case ETH_P_IPV6: | |
2d1ea19d VY |
1360 | /* IPv6 doesn't really use broadcast mac address, but leave |
1361 | * that here just in case. | |
1362 | */ | |
a6700db1 | 1363 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1364 | do_tx_balance = 0; |
1365 | break; | |
2d1ea19d VY |
1366 | } |
1367 | ||
1368 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1369 | * broadcasts in IPv4. | |
1370 | */ | |
a6700db1 | 1371 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1372 | do_tx_balance = 0; |
1373 | break; | |
1374 | } | |
1375 | ||
1376 | /* Additianally, DAD probes should not be tx-balanced as that | |
1377 | * will lead to false positives for duplicate addresses and | |
1378 | * prevent address configuration from working. | |
1379 | */ | |
1380 | ip6hdr = ipv6_hdr(skb); | |
1381 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1382 | do_tx_balance = 0; | |
1383 | break; | |
1da177e4 LT |
1384 | } |
1385 | ||
0660e03f ACM |
1386 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1387 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1388 | break; |
1389 | case ETH_P_IPX: | |
d3bb52b0 | 1390 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1391 | /* something is wrong with this packet */ |
1392 | do_tx_balance = 0; | |
1393 | break; | |
1394 | } | |
1395 | ||
1396 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1397 | /* The only protocol worth balancing in | |
1398 | * this family since it has an "ARP" like | |
1399 | * mechanism | |
1400 | */ | |
1401 | do_tx_balance = 0; | |
1402 | break; | |
1403 | } | |
1404 | ||
1405 | hash_start = (char*)eth_data->h_dest; | |
1406 | hash_size = ETH_ALEN; | |
1407 | break; | |
1408 | case ETH_P_ARP: | |
1409 | do_tx_balance = 0; | |
1410 | if (bond_info->rlb_enabled) { | |
1411 | tx_slave = rlb_arp_xmit(skb, bond); | |
1412 | } | |
1413 | break; | |
1414 | default: | |
1415 | do_tx_balance = 0; | |
1416 | break; | |
1417 | } | |
1418 | ||
1419 | if (do_tx_balance) { | |
1420 | hash_index = _simple_hash(hash_start, hash_size); | |
1421 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1422 | } | |
1423 | ||
1424 | if (!tx_slave) { | |
1425 | /* unbalanced or unassigned, send through primary */ | |
1426 | tx_slave = bond->curr_active_slave; | |
1427 | bond_info->unbalanced_load += skb->len; | |
1428 | } | |
1429 | ||
1430 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
1431 | if (tx_slave != bond->curr_active_slave) { | |
1432 | memcpy(eth_data->h_source, | |
1433 | tx_slave->dev->dev_addr, | |
1434 | ETH_ALEN); | |
1435 | } | |
1436 | ||
1437 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1438 | } else { | |
1439 | if (tx_slave) { | |
f515e6b7 MU |
1440 | _lock_tx_hashtbl(bond); |
1441 | __tlb_clear_slave(bond, tx_slave, 0); | |
1442 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
1443 | } |
1444 | } | |
1445 | ||
04502430 | 1446 | read_unlock(&bond->curr_slave_lock); |
278b2083 | 1447 | read_unlock(&bond->lock); |
1da177e4 LT |
1448 | if (res) { |
1449 | /* no suitable interface, frame not sent */ | |
04502430 | 1450 | kfree_skb(skb); |
1da177e4 | 1451 | } |
278b2083 | 1452 | |
ec634fe3 | 1453 | return NETDEV_TX_OK; |
1da177e4 LT |
1454 | } |
1455 | ||
1b76b316 | 1456 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1457 | { |
1b76b316 JV |
1458 | struct bonding *bond = container_of(work, struct bonding, |
1459 | alb_work.work); | |
1da177e4 LT |
1460 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
1461 | struct slave *slave; | |
1da177e4 LT |
1462 | |
1463 | read_lock(&bond->lock); | |
1464 | ||
dec1e90e | 1465 | if (list_empty(&bond->slave_list)) { |
1da177e4 LT |
1466 | bond_info->tx_rebalance_counter = 0; |
1467 | bond_info->lp_counter = 0; | |
1468 | goto re_arm; | |
1469 | } | |
1470 | ||
1471 | bond_info->tx_rebalance_counter++; | |
1472 | bond_info->lp_counter++; | |
1473 | ||
1474 | /* send learning packets */ | |
7eacd038 | 1475 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
1da177e4 LT |
1476 | /* change of curr_active_slave involves swapping of mac addresses. |
1477 | * in order to avoid this swapping from happening while | |
1478 | * sending the learning packets, the curr_slave_lock must be held for | |
1479 | * read. | |
1480 | */ | |
1481 | read_lock(&bond->curr_slave_lock); | |
1482 | ||
dec1e90e | 1483 | bond_for_each_slave(bond, slave) |
e944ef79 | 1484 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1485 | |
1486 | read_unlock(&bond->curr_slave_lock); | |
1487 | ||
1488 | bond_info->lp_counter = 0; | |
1489 | } | |
1490 | ||
1491 | /* rebalance tx traffic */ | |
1492 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1493 | ||
1494 | read_lock(&bond->curr_slave_lock); | |
1495 | ||
dec1e90e | 1496 | bond_for_each_slave(bond, slave) { |
1da177e4 LT |
1497 | tlb_clear_slave(bond, slave, 1); |
1498 | if (slave == bond->curr_active_slave) { | |
1499 | SLAVE_TLB_INFO(slave).load = | |
1500 | bond_info->unbalanced_load / | |
1501 | BOND_TLB_REBALANCE_INTERVAL; | |
1502 | bond_info->unbalanced_load = 0; | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | read_unlock(&bond->curr_slave_lock); | |
1507 | ||
1508 | bond_info->tx_rebalance_counter = 0; | |
1509 | } | |
1510 | ||
1511 | /* handle rlb stuff */ | |
1512 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1513 | if (bond_info->primary_is_promisc && |
1514 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1515 | ||
d0e81b7e JV |
1516 | /* |
1517 | * dev_set_promiscuity requires rtnl and | |
e6d265e8 | 1518 | * nothing else. Avoid race with bond_close. |
d0e81b7e JV |
1519 | */ |
1520 | read_unlock(&bond->lock); | |
e6d265e8 JV |
1521 | if (!rtnl_trylock()) { |
1522 | read_lock(&bond->lock); | |
1523 | goto re_arm; | |
1524 | } | |
d0e81b7e | 1525 | |
1da177e4 LT |
1526 | bond_info->rlb_promisc_timeout_counter = 0; |
1527 | ||
1528 | /* If the primary was set to promiscuous mode | |
1529 | * because a slave was disabled then | |
1530 | * it can now leave promiscuous mode. | |
1531 | */ | |
1532 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1533 | bond_info->primary_is_promisc = 0; | |
1da177e4 | 1534 | |
d0e81b7e JV |
1535 | rtnl_unlock(); |
1536 | read_lock(&bond->lock); | |
1537 | } | |
1da177e4 LT |
1538 | |
1539 | if (bond_info->rlb_rebalance) { | |
1540 | bond_info->rlb_rebalance = 0; | |
1541 | rlb_rebalance(bond); | |
1542 | } | |
1543 | ||
1544 | /* check if clients need updating */ | |
1545 | if (bond_info->rx_ntt) { | |
1546 | if (bond_info->rlb_update_delay_counter) { | |
1547 | --bond_info->rlb_update_delay_counter; | |
1548 | } else { | |
1549 | rlb_update_rx_clients(bond); | |
1550 | if (bond_info->rlb_update_retry_counter) { | |
1551 | --bond_info->rlb_update_retry_counter; | |
1552 | } else { | |
1553 | bond_info->rx_ntt = 0; | |
1554 | } | |
1555 | } | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | re_arm: | |
e6d265e8 JV |
1560 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1561 | ||
1da177e4 LT |
1562 | read_unlock(&bond->lock); |
1563 | } | |
1564 | ||
1565 | /* assumption: called before the slave is attached to the bond | |
1566 | * and not locked by the bond lock | |
1567 | */ | |
1568 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1569 | { | |
1570 | int res; | |
1571 | ||
b924551b | 1572 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
1da177e4 LT |
1573 | if (res) { |
1574 | return res; | |
1575 | } | |
1576 | ||
1da177e4 | 1577 | res = alb_handle_addr_collision_on_attach(bond, slave); |
1da177e4 LT |
1578 | if (res) { |
1579 | return res; | |
1580 | } | |
1581 | ||
1582 | tlb_init_slave(slave); | |
1583 | ||
1584 | /* order a rebalance ASAP */ | |
1585 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1586 | ||
1587 | if (bond->alb_info.rlb_enabled) { | |
1588 | bond->alb_info.rlb_rebalance = 1; | |
1589 | } | |
1590 | ||
1591 | return 0; | |
1592 | } | |
1593 | ||
2543331d JV |
1594 | /* |
1595 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1596 | * if necessary. | |
1597 | * | |
1598 | * Caller must hold RTNL and no other locks | |
1599 | */ | |
1da177e4 LT |
1600 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1601 | { | |
dec1e90e | 1602 | if (!list_empty(&bond->slave_list)) |
1da177e4 | 1603 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1604 | |
1605 | tlb_clear_slave(bond, slave, 0); | |
1606 | ||
1607 | if (bond->alb_info.rlb_enabled) { | |
1608 | bond->alb_info.next_rx_slave = NULL; | |
1609 | rlb_clear_slave(bond, slave); | |
1610 | } | |
1611 | } | |
1612 | ||
1613 | /* Caller must hold bond lock for read */ | |
1614 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1615 | { | |
1616 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1617 | ||
1618 | if (link == BOND_LINK_DOWN) { | |
1619 | tlb_clear_slave(bond, slave, 0); | |
1620 | if (bond->alb_info.rlb_enabled) { | |
1621 | rlb_clear_slave(bond, slave); | |
1622 | } | |
1623 | } else if (link == BOND_LINK_UP) { | |
1624 | /* order a rebalance ASAP */ | |
1625 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1626 | if (bond->alb_info.rlb_enabled) { | |
1627 | bond->alb_info.rlb_rebalance = 1; | |
1628 | /* If the updelay module parameter is smaller than the | |
1629 | * forwarding delay of the switch the rebalance will | |
1630 | * not work because the rebalance arp replies will | |
1631 | * not be forwarded to the clients.. | |
1632 | */ | |
1633 | } | |
1634 | } | |
1635 | } | |
1636 | ||
1637 | /** | |
1638 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1639 | * @bond: our bonding struct | |
1640 | * @new_slave: new slave to assign | |
1641 | * | |
1642 | * Set the bond->curr_active_slave to @new_slave and handle | |
1643 | * mac address swapping and promiscuity changes as needed. | |
1644 | * | |
059fe7a5 JV |
1645 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1646 | * bond->lock for write. | |
1647 | * | |
1648 | * If new_slave is not NULL, caller must hold RTNL, bond->lock for | |
1649 | * read and curr_slave_lock for write. Processing here may sleep, so | |
1650 | * no other locks may be held. | |
1da177e4 LT |
1651 | */ |
1652 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 HE |
1653 | __releases(&bond->curr_slave_lock) |
1654 | __releases(&bond->lock) | |
1655 | __acquires(&bond->lock) | |
1656 | __acquires(&bond->curr_slave_lock) | |
1da177e4 LT |
1657 | { |
1658 | struct slave *swap_slave; | |
1da177e4 | 1659 | |
dec1e90e | 1660 | if (bond->curr_active_slave == new_slave) |
1da177e4 | 1661 | return; |
1da177e4 LT |
1662 | |
1663 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1664 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1665 | bond->alb_info.primary_is_promisc = 0; | |
1666 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1667 | } | |
1668 | ||
1669 | swap_slave = bond->curr_active_slave; | |
278b2083 | 1670 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1671 | |
dec1e90e | 1672 | if (!new_slave || list_empty(&bond->slave_list)) |
1da177e4 | 1673 | return; |
1da177e4 LT |
1674 | |
1675 | /* set the new curr_active_slave to the bonds mac address | |
1676 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1677 | */ | |
b88ec38d VF |
1678 | if (!swap_slave) |
1679 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1680 | |
059fe7a5 JV |
1681 | /* |
1682 | * Arrange for swap_slave and new_slave to temporarily be | |
1683 | * ignored so we can mess with their MAC addresses without | |
1684 | * fear of interference from transmit activity. | |
1685 | */ | |
dec1e90e | 1686 | if (swap_slave) |
059fe7a5 | 1687 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1688 | tlb_clear_slave(bond, new_slave, 1); |
1689 | ||
1690 | write_unlock_bh(&bond->curr_slave_lock); | |
1691 | read_unlock(&bond->lock); | |
1692 | ||
e0138a66 JV |
1693 | ASSERT_RTNL(); |
1694 | ||
1da177e4 LT |
1695 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1696 | if (swap_slave) { | |
1697 | /* swap mac address */ | |
43547ea6 | 1698 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 | 1699 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
2543331d | 1700 | read_lock(&bond->lock); |
059fe7a5 | 1701 | } else { |
b88ec38d VF |
1702 | /* set the new_slave to the bond mac address */ |
1703 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); | |
2543331d | 1704 | read_lock(&bond->lock); |
1da177e4 LT |
1705 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1706 | } | |
059fe7a5 JV |
1707 | |
1708 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1709 | } |
1710 | ||
059fe7a5 JV |
1711 | /* |
1712 | * Called with RTNL | |
1713 | */ | |
1da177e4 | 1714 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1715 | __acquires(&bond->lock) |
815bcc27 | 1716 | __releases(&bond->lock) |
1da177e4 | 1717 | { |
454d7c9b | 1718 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 | 1719 | struct sockaddr *sa = addr; |
b88ec38d | 1720 | struct slave *swap_slave; |
1da177e4 | 1721 | int res; |
1da177e4 LT |
1722 | |
1723 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1724 | return -EADDRNOTAVAIL; | |
1725 | } | |
1726 | ||
1727 | res = alb_set_mac_address(bond, addr); | |
1728 | if (res) { | |
1729 | return res; | |
1730 | } | |
1731 | ||
1732 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1733 | ||
1734 | /* If there is no curr_active_slave there is nothing else to do. | |
1735 | * Otherwise we'll need to pass the new address to it and handle | |
1736 | * duplications. | |
1737 | */ | |
1738 | if (!bond->curr_active_slave) { | |
1739 | return 0; | |
1740 | } | |
1741 | ||
b88ec38d | 1742 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1743 | |
1744 | if (swap_slave) { | |
43547ea6 | 1745 | alb_swap_mac_addr(swap_slave, bond->curr_active_slave); |
059fe7a5 | 1746 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 | 1747 | } else { |
b924551b | 1748 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr); |
1da177e4 | 1749 | |
815bcc27 | 1750 | read_lock(&bond->lock); |
1da177e4 LT |
1751 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1752 | if (bond->alb_info.rlb_enabled) { | |
1753 | /* inform clients mac address has changed */ | |
1754 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1755 | } | |
815bcc27 | 1756 | read_unlock(&bond->lock); |
1da177e4 LT |
1757 | } |
1758 | ||
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1763 | { | |
1da177e4 LT |
1764 | if (bond->alb_info.rlb_enabled) { |
1765 | rlb_clear_vlan(bond, vlan_id); | |
1766 | } | |
1767 | } | |
1768 |