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 | |
adf8d3ff | 15 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
1da177e4 LT |
16 | * |
17 | * The full GNU General Public License is included in this distribution in the | |
18 | * file called LICENSE. | |
19 | * | |
1da177e4 LT |
20 | */ |
21 | ||
1da177e4 LT |
22 | #include <linux/skbuff.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/pkt_sched.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/timer.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/ipv6.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/if_ether.h> | |
33 | #include <linux/if_bonding.h> | |
34 | #include <linux/if_vlan.h> | |
35 | #include <linux/in.h> | |
36 | #include <net/ipx.h> | |
37 | #include <net/arp.h> | |
2d1ea19d | 38 | #include <net/ipv6.h> |
1da177e4 LT |
39 | #include <asm/byteorder.h> |
40 | #include "bonding.h" | |
41 | #include "bond_alb.h" | |
42 | ||
43 | ||
1da177e4 | 44 | |
885a136c ED |
45 | #ifndef __long_aligned |
46 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
47 | #endif | |
48 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
49 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
50 | }; | |
51 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
52 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
53 | }; | |
1da177e4 LT |
54 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
55 | ||
56 | #pragma pack(1) | |
57 | struct learning_pkt { | |
58 | u8 mac_dst[ETH_ALEN]; | |
59 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 60 | __be16 type; |
1da177e4 LT |
61 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
62 | }; | |
63 | ||
64 | struct arp_pkt { | |
d3bb52b0 AV |
65 | __be16 hw_addr_space; |
66 | __be16 prot_addr_space; | |
1da177e4 LT |
67 | u8 hw_addr_len; |
68 | u8 prot_addr_len; | |
d3bb52b0 | 69 | __be16 op_code; |
1da177e4 | 70 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 71 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 72 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 73 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
74 | }; |
75 | #pragma pack() | |
76 | ||
a16aeb36 ACM |
77 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
78 | { | |
d56f90a7 | 79 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
80 | } |
81 | ||
1da177e4 | 82 | /* Forward declaration */ |
d0c21d43 VY |
83 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
84 | bool strict_match); | |
e53665c6 JB |
85 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
86 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
87 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
88 | u32 ip_dst_hash); | |
1da177e4 | 89 | |
eddc9ec5 | 90 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
91 | { |
92 | int i; | |
93 | u8 hash = 0; | |
94 | ||
fdb89d75 | 95 | for (i = 0; i < hash_size; i++) |
1da177e4 | 96 | hash ^= hash_start[i]; |
1da177e4 LT |
97 | |
98 | return hash; | |
99 | } | |
100 | ||
101 | /*********************** tlb specific functions ***************************/ | |
102 | ||
1da177e4 LT |
103 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) |
104 | { | |
105 | if (save_load) { | |
106 | entry->load_history = 1 + entry->tx_bytes / | |
107 | BOND_TLB_REBALANCE_INTERVAL; | |
108 | entry->tx_bytes = 0; | |
109 | } | |
110 | ||
111 | entry->tx_slave = NULL; | |
112 | entry->next = TLB_NULL_INDEX; | |
113 | entry->prev = TLB_NULL_INDEX; | |
114 | } | |
115 | ||
116 | static inline void tlb_init_slave(struct slave *slave) | |
117 | { | |
118 | SLAVE_TLB_INFO(slave).load = 0; | |
119 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
120 | } | |
121 | ||
f515e6b7 MU |
122 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, |
123 | int save_load) | |
1da177e4 LT |
124 | { |
125 | struct tlb_client_info *tx_hash_table; | |
126 | u32 index; | |
127 | ||
1da177e4 LT |
128 | /* clear slave from tx_hashtbl */ |
129 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
130 | ||
ce39a800 AG |
131 | /* skip this if we've already freed the tx hash table */ |
132 | if (tx_hash_table) { | |
133 | index = SLAVE_TLB_INFO(slave).head; | |
134 | while (index != TLB_NULL_INDEX) { | |
135 | u32 next_index = tx_hash_table[index].next; | |
136 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
137 | index = next_index; | |
138 | } | |
1da177e4 LT |
139 | } |
140 | ||
1da177e4 | 141 | tlb_init_slave(slave); |
f515e6b7 | 142 | } |
5af47b2f | 143 | |
f515e6b7 MU |
144 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, |
145 | int save_load) | |
146 | { | |
4bab16d7 | 147 | spin_lock_bh(&bond->mode_lock); |
f515e6b7 | 148 | __tlb_clear_slave(bond, slave, save_load); |
4bab16d7 | 149 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
150 | } |
151 | ||
152 | /* Must be called before starting the monitor timer */ | |
153 | static int tlb_initialize(struct bonding *bond) | |
154 | { | |
155 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
156 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 157 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
158 | int i; |
159 | ||
243cb4e5 | 160 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 161 | if (!new_hashtbl) |
1da177e4 | 162 | return -1; |
e404decb | 163 | |
4bab16d7 | 164 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
165 | |
166 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 167 | |
fdb89d75 | 168 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) |
38dbaf0a | 169 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 | 170 | |
4bab16d7 | 171 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /* Must be called only after all slaves have been released */ | |
177 | static void tlb_deinitialize(struct bonding *bond) | |
178 | { | |
179 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6b794c1c | 180 | struct tlb_up_slave *arr; |
1da177e4 | 181 | |
4bab16d7 | 182 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
183 | |
184 | kfree(bond_info->tx_hashtbl); | |
185 | bond_info->tx_hashtbl = NULL; | |
186 | ||
4bab16d7 | 187 | spin_unlock_bh(&bond->mode_lock); |
6b794c1c MB |
188 | |
189 | arr = rtnl_dereference(bond_info->slave_arr); | |
190 | if (arr) | |
191 | kfree_rcu(arr, rcu); | |
1da177e4 LT |
192 | } |
193 | ||
097811bb JP |
194 | static long long compute_gap(struct slave *slave) |
195 | { | |
196 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
197 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
198 | } | |
199 | ||
1da177e4 LT |
200 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) |
201 | { | |
202 | struct slave *slave, *least_loaded; | |
9caff1e7 | 203 | struct list_head *iter; |
097811bb | 204 | long long max_gap; |
1da177e4 | 205 | |
097811bb JP |
206 | least_loaded = NULL; |
207 | max_gap = LLONG_MIN; | |
1da177e4 LT |
208 | |
209 | /* Find the slave with the largest gap */ | |
28c71926 | 210 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 211 | if (bond_slave_can_tx(slave)) { |
097811bb JP |
212 | long long gap = compute_gap(slave); |
213 | ||
1da177e4 LT |
214 | if (max_gap < gap) { |
215 | least_loaded = slave; | |
216 | max_gap = gap; | |
217 | } | |
218 | } | |
219 | } | |
220 | ||
221 | return least_loaded; | |
222 | } | |
223 | ||
f515e6b7 MU |
224 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
225 | u32 skb_len) | |
1da177e4 LT |
226 | { |
227 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
228 | struct tlb_client_info *hash_table; | |
229 | struct slave *assigned_slave; | |
230 | ||
1da177e4 LT |
231 | hash_table = bond_info->tx_hashtbl; |
232 | assigned_slave = hash_table[hash_index].tx_slave; | |
233 | if (!assigned_slave) { | |
234 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
235 | ||
236 | if (assigned_slave) { | |
237 | struct tlb_slave_info *slave_info = | |
238 | &(SLAVE_TLB_INFO(assigned_slave)); | |
239 | u32 next_index = slave_info->head; | |
240 | ||
241 | hash_table[hash_index].tx_slave = assigned_slave; | |
242 | hash_table[hash_index].next = next_index; | |
243 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
244 | ||
fdb89d75 | 245 | if (next_index != TLB_NULL_INDEX) |
1da177e4 | 246 | hash_table[next_index].prev = hash_index; |
1da177e4 LT |
247 | |
248 | slave_info->head = hash_index; | |
249 | slave_info->load += | |
250 | hash_table[hash_index].load_history; | |
251 | } | |
252 | } | |
253 | ||
fdb89d75 | 254 | if (assigned_slave) |
1da177e4 | 255 | hash_table[hash_index].tx_bytes += skb_len; |
1da177e4 | 256 | |
1da177e4 LT |
257 | return assigned_slave; |
258 | } | |
259 | ||
f515e6b7 MU |
260 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, |
261 | u32 skb_len) | |
262 | { | |
263 | struct slave *tx_slave; | |
264 | /* | |
265 | * We don't need to disable softirq here, becase | |
266 | * tlb_choose_channel() is only called by bond_alb_xmit() | |
267 | * which already has softirq disabled. | |
268 | */ | |
4bab16d7 | 269 | spin_lock(&bond->mode_lock); |
f515e6b7 | 270 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); |
4bab16d7 | 271 | spin_unlock(&bond->mode_lock); |
f515e6b7 MU |
272 | return tx_slave; |
273 | } | |
274 | ||
1da177e4 | 275 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 276 | |
1da177e4 LT |
277 | /* when an ARP REPLY is received from a client update its info |
278 | * in the rx_hashtbl | |
279 | */ | |
280 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
281 | { | |
282 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
283 | struct rlb_client_info *client_info; | |
284 | u32 hash_index; | |
285 | ||
4bab16d7 | 286 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 287 | |
b85b6fb1 | 288 | hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
1da177e4 LT |
289 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
290 | ||
291 | if ((client_info->assigned) && | |
292 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 293 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 294 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 | 295 | /* update the clients MAC address */ |
ada0f863 | 296 | ether_addr_copy(client_info->mac_dst, arp->mac_src); |
1da177e4 LT |
297 | client_info->ntt = 1; |
298 | bond_info->rx_ntt = 1; | |
299 | } | |
300 | ||
4bab16d7 | 301 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
302 | } |
303 | ||
de063b70 ED |
304 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
305 | struct slave *slave) | |
1da177e4 | 306 | { |
de063b70 | 307 | struct arp_pkt *arp, _arp; |
1da177e4 | 308 | |
3aba891d | 309 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 310 | goto out; |
1da177e4 | 311 | |
de063b70 ED |
312 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
313 | if (!arp) | |
b99215cd | 314 | goto out; |
1da177e4 | 315 | |
e53665c6 JB |
316 | /* We received an ARP from arp->ip_src. |
317 | * We might have used this IP address previously (on the bonding host | |
318 | * itself or on a system that is bridged together with the bond). | |
319 | * However, if arp->mac_src is different than what is stored in | |
320 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
321 | * sending out client updates with this IP address and the old MAC | |
322 | * address. | |
323 | * Clean up all hash table entries that have this address as ip_src but | |
324 | * have a different mac_src. | |
325 | */ | |
326 | rlb_purge_src_ip(bond, arp); | |
327 | ||
1da177e4 LT |
328 | if (arp->op_code == htons(ARPOP_REPLY)) { |
329 | /* update rx hash table for this ARP */ | |
330 | rlb_update_entry_from_arp(bond, arp); | |
0a111a03 | 331 | netdev_dbg(bond->dev, "Server received an ARP Reply from client\n"); |
1da177e4 | 332 | } |
b99215cd DM |
333 | out: |
334 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
335 | } |
336 | ||
56924c38 NA |
337 | /* Caller must hold rcu_read_lock() */ |
338 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
1da177e4 LT |
339 | { |
340 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6475ae4c VF |
341 | struct slave *before = NULL, *rx_slave = NULL, *slave; |
342 | struct list_head *iter; | |
343 | bool found = false; | |
1da177e4 | 344 | |
56924c38 | 345 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 346 | if (!bond_slave_can_tx(slave)) |
6475ae4c VF |
347 | continue; |
348 | if (!found) { | |
349 | if (!before || before->speed < slave->speed) | |
350 | before = slave; | |
351 | } else { | |
352 | if (!rx_slave || rx_slave->speed < slave->speed) | |
1da177e4 | 353 | rx_slave = slave; |
1da177e4 | 354 | } |
6475ae4c VF |
355 | if (slave == bond_info->rx_slave) |
356 | found = true; | |
1da177e4 | 357 | } |
6475ae4c VF |
358 | /* we didn't find anything after the current or we have something |
359 | * better before and up to the current slave | |
360 | */ | |
361 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
362 | rx_slave = before; | |
1da177e4 | 363 | |
6475ae4c VF |
364 | if (rx_slave) |
365 | bond_info->rx_slave = rx_slave; | |
1da177e4 LT |
366 | |
367 | return rx_slave; | |
368 | } | |
369 | ||
56924c38 NA |
370 | /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */ |
371 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
28c71926 | 372 | { |
56924c38 | 373 | struct slave *rx_slave; |
28c71926 | 374 | |
56924c38 | 375 | ASSERT_RTNL(); |
28c71926 | 376 | |
56924c38 NA |
377 | rcu_read_lock(); |
378 | rx_slave = __rlb_next_rx_slave(bond); | |
379 | rcu_read_unlock(); | |
28c71926 | 380 | |
381 | return rx_slave; | |
382 | } | |
383 | ||
1da177e4 LT |
384 | /* teach the switch the mac of a disabled slave |
385 | * on the primary for fault tolerance | |
386 | * | |
62c5f518 | 387 | * Caller must hold RTNL |
1da177e4 LT |
388 | */ |
389 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
390 | { | |
1c72cfdc | 391 | struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 ED |
392 | |
393 | if (!curr_active) | |
1da177e4 | 394 | return; |
1da177e4 LT |
395 | |
396 | if (!bond->alb_info.primary_is_promisc) { | |
4740d638 | 397 | if (!dev_set_promiscuity(curr_active->dev, 1)) |
7e1a1ac1 WC |
398 | bond->alb_info.primary_is_promisc = 1; |
399 | else | |
400 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
401 | } |
402 | ||
403 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
404 | ||
4740d638 | 405 | alb_send_learning_packets(curr_active, addr, true); |
1da177e4 LT |
406 | } |
407 | ||
408 | /* slave being removed should not be active at this point | |
409 | * | |
b2e7aceb | 410 | * Caller must hold rtnl. |
1da177e4 LT |
411 | */ |
412 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
413 | { | |
414 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
415 | struct rlb_client_info *rx_hash_table; | |
416 | u32 index, next_index; | |
417 | ||
418 | /* clear slave from rx_hashtbl */ | |
4bab16d7 | 419 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
420 | |
421 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 422 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 423 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 424 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
425 | if (rx_hash_table[index].slave == slave) { |
426 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
427 | ||
428 | if (assigned_slave) { | |
429 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
430 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
431 | mac_bcast)) { | |
1da177e4 LT |
432 | bond_info->rx_hashtbl[index].ntt = 1; |
433 | bond_info->rx_ntt = 1; | |
434 | /* A slave has been removed from the | |
435 | * table because it is either disabled | |
436 | * or being released. We must retry the | |
437 | * update to avoid clients from not | |
438 | * being updated & disconnecting when | |
439 | * there is stress | |
440 | */ | |
441 | bond_info->rlb_update_retry_counter = | |
442 | RLB_UPDATE_RETRY; | |
443 | } | |
444 | } else { /* there is no active slave */ | |
445 | rx_hash_table[index].slave = NULL; | |
446 | } | |
447 | } | |
448 | } | |
449 | ||
4bab16d7 | 450 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 451 | |
1c72cfdc | 452 | if (slave != rtnl_dereference(bond->curr_active_slave)) |
1da177e4 | 453 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); |
1da177e4 LT |
454 | } |
455 | ||
456 | static void rlb_update_client(struct rlb_client_info *client_info) | |
457 | { | |
458 | int i; | |
459 | ||
35d75ee4 | 460 | if (!client_info->slave) |
1da177e4 | 461 | return; |
1da177e4 LT |
462 | |
463 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
464 | struct sk_buff *skb; | |
465 | ||
466 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
467 | client_info->ip_dst, | |
468 | client_info->slave->dev, | |
469 | client_info->ip_src, | |
470 | client_info->mac_dst, | |
471 | client_info->slave->dev->dev_addr, | |
472 | client_info->mac_dst); | |
473 | if (!skb) { | |
0a111a03 VF |
474 | netdev_err(client_info->slave->bond->dev, |
475 | "failed to create an ARP packet\n"); | |
1da177e4 LT |
476 | continue; |
477 | } | |
478 | ||
479 | skb->dev = client_info->slave->dev; | |
480 | ||
d3ab3ffd | 481 | if (client_info->vlan_id) { |
86a9bad3 | 482 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id); |
1da177e4 | 483 | if (!skb) { |
0a111a03 VF |
484 | netdev_err(client_info->slave->bond->dev, |
485 | "failed to insert VLAN tag\n"); | |
1da177e4 LT |
486 | continue; |
487 | } | |
488 | } | |
489 | ||
490 | arp_xmit(skb); | |
491 | } | |
492 | } | |
493 | ||
494 | /* sends ARP REPLIES that update the clients that need updating */ | |
495 | static void rlb_update_rx_clients(struct bonding *bond) | |
496 | { | |
497 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
498 | struct rlb_client_info *client_info; | |
499 | u32 hash_index; | |
500 | ||
4bab16d7 | 501 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 502 | |
e53665c6 JB |
503 | hash_index = bond_info->rx_hashtbl_used_head; |
504 | for (; hash_index != RLB_NULL_INDEX; | |
505 | hash_index = client_info->used_next) { | |
1da177e4 LT |
506 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
507 | if (client_info->ntt) { | |
508 | rlb_update_client(client_info); | |
35d75ee4 | 509 | if (bond_info->rlb_update_retry_counter == 0) |
1da177e4 | 510 | client_info->ntt = 0; |
1da177e4 LT |
511 | } |
512 | } | |
513 | ||
94e2bd68 | 514 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
515 | * not to confuse the clients. |
516 | */ | |
517 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
518 | ||
4bab16d7 | 519 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
520 | } |
521 | ||
522 | /* The slave was assigned a new mac address - update the clients */ | |
523 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
524 | { | |
525 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
526 | struct rlb_client_info *client_info; | |
527 | int ntt = 0; | |
528 | u32 hash_index; | |
529 | ||
4bab16d7 | 530 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 531 | |
e53665c6 JB |
532 | hash_index = bond_info->rx_hashtbl_used_head; |
533 | for (; hash_index != RLB_NULL_INDEX; | |
534 | hash_index = client_info->used_next) { | |
1da177e4 LT |
535 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
536 | ||
537 | if ((client_info->slave == slave) && | |
a6700db1 | 538 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
539 | client_info->ntt = 1; |
540 | ntt = 1; | |
541 | } | |
542 | } | |
543 | ||
4708a1b1 | 544 | /* update the team's flag only after the whole iteration */ |
1da177e4 LT |
545 | if (ntt) { |
546 | bond_info->rx_ntt = 1; | |
4708a1b1 | 547 | /* fasten the change */ |
1da177e4 LT |
548 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
549 | } | |
550 | ||
4bab16d7 | 551 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
552 | } |
553 | ||
554 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 555 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
556 | { |
557 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
558 | struct rlb_client_info *client_info; | |
559 | u32 hash_index; | |
560 | ||
4bab16d7 | 561 | spin_lock(&bond->mode_lock); |
1da177e4 | 562 | |
e53665c6 JB |
563 | hash_index = bond_info->rx_hashtbl_used_head; |
564 | for (; hash_index != RLB_NULL_INDEX; | |
565 | hash_index = client_info->used_next) { | |
1da177e4 LT |
566 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
567 | ||
568 | if (!client_info->slave) { | |
0a111a03 | 569 | netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); |
1da177e4 LT |
570 | continue; |
571 | } | |
572 | /*update all clients using this src_ip, that are not assigned | |
573 | * to the team's address (curr_active_slave) and have a known | |
574 | * unicast mac address. | |
575 | */ | |
576 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
577 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
578 | bond->dev->dev_addr) && | |
579 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
580 | client_info->ntt = 1; |
581 | bond_info->rx_ntt = 1; | |
582 | } | |
583 | } | |
584 | ||
4bab16d7 | 585 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
586 | } |
587 | ||
1da177e4 LT |
588 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) |
589 | { | |
590 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 591 | struct arp_pkt *arp = arp_pkt(skb); |
28c71926 | 592 | struct slave *assigned_slave, *curr_active_slave; |
1da177e4 LT |
593 | struct rlb_client_info *client_info; |
594 | u32 hash_index = 0; | |
595 | ||
4bab16d7 | 596 | spin_lock(&bond->mode_lock); |
1da177e4 | 597 | |
28c71926 | 598 | curr_active_slave = rcu_dereference(bond->curr_active_slave); |
599 | ||
e364a341 | 600 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
601 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
602 | ||
603 | if (client_info->assigned) { | |
604 | if ((client_info->ip_src == arp->ip_src) && | |
605 | (client_info->ip_dst == arp->ip_dst)) { | |
606 | /* the entry is already assigned to this client */ | |
a6700db1 | 607 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 | 608 | /* update mac address from arp */ |
ada0f863 | 609 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
1da177e4 | 610 | } |
ada0f863 | 611 | ether_addr_copy(client_info->mac_src, arp->mac_src); |
1da177e4 LT |
612 | |
613 | assigned_slave = client_info->slave; | |
614 | if (assigned_slave) { | |
4bab16d7 | 615 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
616 | return assigned_slave; |
617 | } | |
618 | } else { | |
619 | /* the entry is already assigned to some other client, | |
620 | * move the old client to primary (curr_active_slave) so | |
621 | * that the new client can be assigned to this entry. | |
622 | */ | |
4740d638 | 623 | if (curr_active_slave && |
28c71926 | 624 | client_info->slave != curr_active_slave) { |
625 | client_info->slave = curr_active_slave; | |
1da177e4 LT |
626 | rlb_update_client(client_info); |
627 | } | |
628 | } | |
629 | } | |
630 | /* assign a new slave */ | |
28c71926 | 631 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
632 | |
633 | if (assigned_slave) { | |
e53665c6 JB |
634 | if (!(client_info->assigned && |
635 | client_info->ip_src == arp->ip_src)) { | |
636 | /* ip_src is going to be updated, | |
637 | * fix the src hash list | |
638 | */ | |
639 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
640 | sizeof(arp->ip_src)); | |
641 | rlb_src_unlink(bond, hash_index); | |
642 | rlb_src_link(bond, hash_src, hash_index); | |
643 | } | |
644 | ||
1da177e4 LT |
645 | client_info->ip_src = arp->ip_src; |
646 | client_info->ip_dst = arp->ip_dst; | |
647 | /* arp->mac_dst is broadcast for arp reqeusts. | |
648 | * will be updated with clients actual unicast mac address | |
649 | * upon receiving an arp reply. | |
650 | */ | |
ada0f863 JP |
651 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
652 | ether_addr_copy(client_info->mac_src, arp->mac_src); | |
1da177e4 LT |
653 | client_info->slave = assigned_slave; |
654 | ||
a6700db1 | 655 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
656 | client_info->ntt = 1; |
657 | bond->alb_info.rx_ntt = 1; | |
658 | } else { | |
659 | client_info->ntt = 0; | |
660 | } | |
661 | ||
fb00bc2e | 662 | if (vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 663 | client_info->vlan_id = 0; |
1da177e4 LT |
664 | |
665 | if (!client_info->assigned) { | |
e53665c6 JB |
666 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
667 | bond_info->rx_hashtbl_used_head = hash_index; | |
668 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 669 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 670 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
671 | hash_index; |
672 | } | |
673 | client_info->assigned = 1; | |
674 | } | |
675 | } | |
676 | ||
4bab16d7 | 677 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
678 | |
679 | return assigned_slave; | |
680 | } | |
681 | ||
682 | /* chooses (and returns) transmit channel for arp reply | |
683 | * does not choose channel for other arp types since they are | |
684 | * sent on the curr_active_slave | |
685 | */ | |
686 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
687 | { | |
a16aeb36 | 688 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
689 | struct slave *tx_slave = NULL; |
690 | ||
567b871e | 691 | /* Don't modify or load balance ARPs that do not originate locally |
692 | * (e.g.,arrive via a bridge). | |
693 | */ | |
14af9963 | 694 | if (!bond_slave_has_mac_rx(bond, arp->mac_src)) |
567b871e | 695 | return NULL; |
696 | ||
f14c4e4e | 697 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
698 | /* the arp must be sent on the selected |
699 | * rx channel | |
700 | */ | |
701 | tx_slave = rlb_choose_channel(skb, bond); | |
35d75ee4 | 702 | if (tx_slave) |
ada0f863 | 703 | ether_addr_copy(arp->mac_src, tx_slave->dev->dev_addr); |
0a111a03 | 704 | netdev_dbg(bond->dev, "Server sent ARP Reply packet\n"); |
f14c4e4e | 705 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
706 | /* Create an entry in the rx_hashtbl for this client as a |
707 | * place holder. | |
708 | * When the arp reply is received the entry will be updated | |
709 | * with the correct unicast address of the client. | |
710 | */ | |
711 | rlb_choose_channel(skb, bond); | |
712 | ||
77c8e2c0 | 713 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
714 | * they can cancel out the influence of the ARP request. |
715 | */ | |
716 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
717 | ||
718 | /* arp requests are broadcast and are sent on the primary | |
719 | * the arp request will collapse all clients on the subnet to | |
720 | * the primary slave. We must register these clients to be | |
721 | * updated with their assigned mac. | |
722 | */ | |
723 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
0a111a03 | 724 | netdev_dbg(bond->dev, "Server sent ARP Request packet\n"); |
1da177e4 LT |
725 | } |
726 | ||
727 | return tx_slave; | |
728 | } | |
729 | ||
1da177e4 LT |
730 | static void rlb_rebalance(struct bonding *bond) |
731 | { | |
732 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
733 | struct slave *assigned_slave; | |
734 | struct rlb_client_info *client_info; | |
735 | int ntt; | |
736 | u32 hash_index; | |
737 | ||
4bab16d7 | 738 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
739 | |
740 | ntt = 0; | |
e53665c6 JB |
741 | hash_index = bond_info->rx_hashtbl_used_head; |
742 | for (; hash_index != RLB_NULL_INDEX; | |
743 | hash_index = client_info->used_next) { | |
1da177e4 | 744 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
733ab639 | 745 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
746 | if (assigned_slave && (client_info->slave != assigned_slave)) { |
747 | client_info->slave = assigned_slave; | |
748 | client_info->ntt = 1; | |
749 | ntt = 1; | |
750 | } | |
751 | } | |
752 | ||
753 | /* update the team's flag only after the whole iteration */ | |
35d75ee4 | 754 | if (ntt) |
1da177e4 | 755 | bond_info->rx_ntt = 1; |
4bab16d7 | 756 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
757 | } |
758 | ||
759 | /* Caller must hold rx_hashtbl lock */ | |
e53665c6 JB |
760 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
761 | { | |
762 | entry->used_next = RLB_NULL_INDEX; | |
763 | entry->used_prev = RLB_NULL_INDEX; | |
764 | entry->assigned = 0; | |
765 | entry->slave = NULL; | |
d3ab3ffd | 766 | entry->vlan_id = 0; |
e53665c6 JB |
767 | } |
768 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
769 | { | |
770 | entry->src_first = RLB_NULL_INDEX; | |
771 | entry->src_prev = RLB_NULL_INDEX; | |
772 | entry->src_next = RLB_NULL_INDEX; | |
773 | } | |
774 | ||
1da177e4 LT |
775 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
776 | { | |
777 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
778 | rlb_init_table_entry_dst(entry); |
779 | rlb_init_table_entry_src(entry); | |
780 | } | |
781 | ||
782 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
783 | { | |
784 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
785 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
786 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
787 | ||
788 | if (index == bond_info->rx_hashtbl_used_head) | |
789 | bond_info->rx_hashtbl_used_head = next_index; | |
790 | if (prev_index != RLB_NULL_INDEX) | |
791 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
792 | if (next_index != RLB_NULL_INDEX) | |
793 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
794 | } | |
795 | ||
796 | /* unlink a rlb hash table entry from the src list */ | |
797 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
798 | { | |
799 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
800 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
801 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
802 | ||
803 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
804 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
805 | ||
806 | if (next_index != RLB_NULL_INDEX) | |
807 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
808 | ||
809 | if (prev_index == RLB_NULL_INDEX) | |
810 | return; | |
811 | ||
812 | /* is prev_index pointing to the head of this list? */ | |
813 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
814 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
815 | else | |
816 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
817 | ||
818 | } | |
819 | ||
820 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
821 | { | |
822 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
823 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
824 | ||
825 | rlb_delete_table_entry_dst(bond, index); | |
826 | rlb_init_table_entry_dst(entry); | |
827 | ||
828 | rlb_src_unlink(bond, index); | |
829 | } | |
830 | ||
831 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
832 | * of entries with identical ip_src_hash | |
833 | */ | |
834 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
835 | { | |
836 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
837 | u32 next; | |
838 | ||
839 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
840 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
841 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
842 | if (next != RLB_NULL_INDEX) | |
843 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
844 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
845 | } | |
846 | ||
847 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does | |
848 | * not match arp->mac_src */ | |
849 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) | |
850 | { | |
851 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
b85b6fb1 | 852 | u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
e53665c6 JB |
853 | u32 index; |
854 | ||
4bab16d7 | 855 | spin_lock_bh(&bond->mode_lock); |
e53665c6 JB |
856 | |
857 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
858 | while (index != RLB_NULL_INDEX) { | |
859 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
860 | u32 next_index = entry->src_next; | |
861 | if (entry->ip_src == arp->ip_src && | |
862 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
863 | rlb_delete_table_entry(bond, index); | |
864 | index = next_index; | |
865 | } | |
4bab16d7 | 866 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
867 | } |
868 | ||
869 | static int rlb_initialize(struct bonding *bond) | |
870 | { | |
871 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 872 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
873 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
874 | int i; | |
875 | ||
0d206a3a | 876 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 877 | if (!new_hashtbl) |
1da177e4 | 878 | return -1; |
e404decb | 879 | |
4bab16d7 | 880 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
881 | |
882 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 883 | |
e53665c6 | 884 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 885 | |
35d75ee4 | 886 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) |
1da177e4 | 887 | rlb_init_table_entry(bond_info->rx_hashtbl + i); |
1da177e4 | 888 | |
4bab16d7 | 889 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 890 | |
1da177e4 | 891 | /* register to receive ARPs */ |
3aba891d | 892 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
893 | |
894 | return 0; | |
895 | } | |
896 | ||
897 | static void rlb_deinitialize(struct bonding *bond) | |
898 | { | |
899 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
900 | ||
4bab16d7 | 901 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
902 | |
903 | kfree(bond_info->rx_hashtbl); | |
904 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 905 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 906 | |
4bab16d7 | 907 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
908 | } |
909 | ||
910 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
911 | { | |
912 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
913 | u32 curr_index; | |
914 | ||
4bab16d7 | 915 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 916 | |
e53665c6 | 917 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
918 | while (curr_index != RLB_NULL_INDEX) { |
919 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 920 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 921 | |
d3ab3ffd | 922 | if (curr->vlan_id == vlan_id) |
e53665c6 | 923 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
924 | |
925 | curr_index = next_index; | |
926 | } | |
927 | ||
4bab16d7 | 928 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
929 | } |
930 | ||
931 | /*********************** tlb/rlb shared functions *********************/ | |
932 | ||
7aa64981 | 933 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
d6b694c0 | 934 | __be16 vlan_proto, u16 vid) |
1da177e4 | 935 | { |
1da177e4 | 936 | struct learning_pkt pkt; |
7aa64981 | 937 | struct sk_buff *skb; |
1da177e4 | 938 | int size = sizeof(struct learning_pkt); |
7aa64981 | 939 | char *data; |
1da177e4 LT |
940 | |
941 | memset(&pkt, 0, size); | |
ada0f863 JP |
942 | ether_addr_copy(pkt.mac_dst, mac_addr); |
943 | ether_addr_copy(pkt.mac_src, mac_addr); | |
96a0922c | 944 | pkt.type = cpu_to_be16(ETH_P_LOOPBACK); |
1da177e4 | 945 | |
7aa64981 VF |
946 | skb = dev_alloc_skb(size); |
947 | if (!skb) | |
948 | return; | |
1da177e4 | 949 | |
7aa64981 VF |
950 | data = skb_put(skb, size); |
951 | memcpy(data, &pkt, size); | |
952 | ||
953 | skb_reset_mac_header(skb); | |
954 | skb->network_header = skb->mac_header + ETH_HLEN; | |
955 | skb->protocol = pkt.type; | |
956 | skb->priority = TC_PRIO_CONTROL; | |
957 | skb->dev = slave->dev; | |
958 | ||
959 | if (vid) { | |
d6b694c0 | 960 | skb = vlan_put_tag(skb, vlan_proto, vid); |
1da177e4 | 961 | if (!skb) { |
0a111a03 | 962 | netdev_err(slave->bond->dev, "failed to insert VLAN tag\n"); |
1da177e4 LT |
963 | return; |
964 | } | |
7aa64981 VF |
965 | } |
966 | ||
967 | dev_queue_xmit(skb); | |
968 | } | |
1da177e4 | 969 | |
d0c21d43 VY |
970 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
971 | bool strict_match) | |
7aa64981 VF |
972 | { |
973 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
5bf94b83 VF |
974 | struct net_device *upper; |
975 | struct list_head *iter; | |
3e403a77 | 976 | struct bond_vlan_tag *tags; |
5bf94b83 VF |
977 | |
978 | /* send untagged */ | |
d6b694c0 | 979 | alb_send_lp_vid(slave, mac_addr, 0, 0); |
5bf94b83 | 980 | |
14af9963 VY |
981 | /* loop through all devices and see if we need to send a packet |
982 | * for that device. | |
983 | */ | |
5bf94b83 | 984 | rcu_read_lock(); |
2f268f12 | 985 | netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { |
d0c21d43 VY |
986 | if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) { |
987 | if (strict_match && | |
988 | ether_addr_equal_64bits(mac_addr, | |
989 | upper->dev_addr)) { | |
990 | alb_send_lp_vid(slave, mac_addr, | |
991 | vlan_dev_vlan_proto(upper), | |
992 | vlan_dev_vlan_id(upper)); | |
993 | } else if (!strict_match) { | |
994 | alb_send_lp_vid(slave, upper->dev_addr, | |
995 | vlan_dev_vlan_proto(upper), | |
996 | vlan_dev_vlan_id(upper)); | |
997 | } | |
998 | } | |
14af9963 VY |
999 | |
1000 | /* If this is a macvlan device, then only send updates | |
1001 | * when strict_match is turned off. | |
1002 | */ | |
1003 | if (netif_is_macvlan(upper) && !strict_match) { | |
3e403a77 VF |
1004 | tags = bond_verify_device_path(bond->dev, upper, 0); |
1005 | if (IS_ERR_OR_NULL(tags)) | |
1006 | BUG(); | |
14af9963 VY |
1007 | alb_send_lp_vid(slave, upper->dev_addr, |
1008 | tags[0].vlan_proto, tags[0].vlan_id); | |
3e403a77 | 1009 | kfree(tags); |
14af9963 | 1010 | } |
1da177e4 | 1011 | } |
5bf94b83 | 1012 | rcu_read_unlock(); |
1da177e4 LT |
1013 | } |
1014 | ||
b924551b | 1015 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
1016 | { |
1017 | struct net_device *dev = slave->dev; | |
1018 | struct sockaddr s_addr; | |
1019 | ||
01844098 | 1020 | if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { |
1da177e4 LT |
1021 | memcpy(dev->dev_addr, addr, dev->addr_len); |
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
1026 | /* each slave will receive packets destined to a different mac */ | |
1027 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
1028 | s_addr.sa_family = dev->type; | |
1029 | if (dev_set_mac_address(dev, &s_addr)) { | |
0a111a03 VF |
1030 | netdev_err(slave->bond->dev, "dev_set_mac_address of dev %s failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", |
1031 | dev->name); | |
1da177e4 LT |
1032 | return -EOPNOTSUPP; |
1033 | } | |
1034 | return 0; | |
1035 | } | |
1036 | ||
059fe7a5 JV |
1037 | /* |
1038 | * Swap MAC addresses between two slaves. | |
1039 | * | |
1040 | * Called with RTNL held, and no other locks. | |
1041 | * | |
1042 | */ | |
1043 | ||
43547ea6 | 1044 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1045 | { |
1da177e4 | 1046 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 | 1047 | |
ada0f863 | 1048 | ether_addr_copy(tmp_mac_addr, slave1->dev->dev_addr); |
b924551b JB |
1049 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
1050 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 1051 | |
059fe7a5 JV |
1052 | } |
1053 | ||
1054 | /* | |
1055 | * Send learning packets after MAC address swap. | |
1056 | * | |
2543331d | 1057 | * Called with RTNL and no other locks |
059fe7a5 JV |
1058 | */ |
1059 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1060 | struct slave *slave2) | |
1061 | { | |
8557cd74 | 1062 | int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); |
059fe7a5 JV |
1063 | struct slave *disabled_slave = NULL; |
1064 | ||
2543331d JV |
1065 | ASSERT_RTNL(); |
1066 | ||
1da177e4 | 1067 | /* fasten the change in the switch */ |
8557cd74 | 1068 | if (bond_slave_can_tx(slave1)) { |
d0c21d43 | 1069 | alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); |
1da177e4 LT |
1070 | if (bond->alb_info.rlb_enabled) { |
1071 | /* inform the clients that the mac address | |
1072 | * has changed | |
1073 | */ | |
1074 | rlb_req_update_slave_clients(bond, slave1); | |
1075 | } | |
1076 | } else { | |
1077 | disabled_slave = slave1; | |
1078 | } | |
1079 | ||
8557cd74 | 1080 | if (bond_slave_can_tx(slave2)) { |
d0c21d43 | 1081 | alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); |
1da177e4 LT |
1082 | if (bond->alb_info.rlb_enabled) { |
1083 | /* inform the clients that the mac address | |
1084 | * has changed | |
1085 | */ | |
1086 | rlb_req_update_slave_clients(bond, slave2); | |
1087 | } | |
1088 | } else { | |
1089 | disabled_slave = slave2; | |
1090 | } | |
1091 | ||
1092 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1093 | /* A disabled slave was assigned an active mac addr */ | |
1094 | rlb_teach_disabled_mac_on_primary(bond, | |
1095 | disabled_slave->dev->dev_addr); | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * alb_change_hw_addr_on_detach | |
1101 | * @bond: bonding we're working on | |
1102 | * @slave: the slave that was just detached | |
1103 | * | |
1104 | * We assume that @slave was already detached from the slave list. | |
1105 | * | |
1106 | * If @slave's permanent hw address is different both from its current | |
1107 | * address and from @bond's address, then somewhere in the bond there's | |
1108 | * a slave that has @slave's permanet address as its current address. | |
1109 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1110 | * | |
2543331d | 1111 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1112 | */ |
1113 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1114 | { | |
1115 | int perm_curr_diff; | |
1116 | int perm_bond_diff; | |
b88ec38d | 1117 | struct slave *found_slave; |
1da177e4 | 1118 | |
a6700db1 JP |
1119 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1120 | slave->dev->dev_addr); | |
1121 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1122 | bond->dev->dev_addr); | |
1da177e4 LT |
1123 | |
1124 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1125 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1126 | |
b88ec38d | 1127 | if (found_slave) { |
059fe7a5 | 1128 | /* locking: needs RTNL and nothing else */ |
b88ec38d VF |
1129 | alb_swap_mac_addr(slave, found_slave); |
1130 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1131 | } |
1132 | } | |
1133 | } | |
1134 | ||
1135 | /** | |
1136 | * alb_handle_addr_collision_on_attach | |
1137 | * @bond: bonding we're working on | |
1138 | * @slave: the slave that was just attached | |
1139 | * | |
1140 | * checks uniqueness of slave's mac address and handles the case the | |
1141 | * new slave uses the bonds mac address. | |
1142 | * | |
1143 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1144 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1145 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1146 | * addresses of the other slaves. |
1147 | * | |
1148 | * We go over the slave list, and for each slave there we compare its | |
1149 | * permanent hw address with the current address of all the other slaves. | |
1150 | * If no match was found, then we've found a slave with a permanent address | |
1151 | * that isn't used by any other slave in the bond, so we can assign it to | |
1152 | * @slave. | |
1153 | * | |
1154 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1155 | * bond slave list. |
1da177e4 LT |
1156 | */ |
1157 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1158 | { | |
4740d638 | 1159 | struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); |
9caff1e7 VF |
1160 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1161 | struct list_head *iter; | |
1da177e4 | 1162 | |
0965a1f3 | 1163 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1164 | /* this is the first slave */ |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | /* if slave's mac address differs from bond's mac address | |
1169 | * check uniqueness of slave's mac address against the other | |
1170 | * slaves in the bond. | |
1171 | */ | |
a6700db1 | 1172 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1173 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1174 | return 0; |
1da177e4 | 1175 | |
6b38aefe JL |
1176 | /* Try setting slave mac to bond address and fall-through |
1177 | to code handling that situation below... */ | |
b924551b | 1178 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | /* The slave's address is equal to the address of the bond. | |
1182 | * Search for a spare address in the bond for this slave. | |
1183 | */ | |
9caff1e7 | 1184 | bond_for_each_slave(bond, tmp_slave1, iter) { |
cedb743f | 1185 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1186 | /* no slave has tmp_slave1's perm addr |
1187 | * as its curr addr | |
1188 | */ | |
1189 | free_mac_slave = tmp_slave1; | |
1190 | break; | |
1191 | } | |
1192 | ||
1193 | if (!has_bond_addr) { | |
a6700db1 JP |
1194 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1195 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1196 | |
1197 | has_bond_addr = tmp_slave1; | |
1198 | } | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | if (free_mac_slave) { | |
b924551b | 1203 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1204 | |
0a111a03 VF |
1205 | netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n", |
1206 | slave->dev->name, free_mac_slave->dev->name); | |
1da177e4 LT |
1207 | |
1208 | } else if (has_bond_addr) { | |
0a111a03 VF |
1209 | netdev_err(bond->dev, "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", |
1210 | slave->dev->name); | |
1da177e4 LT |
1211 | return -EFAULT; |
1212 | } | |
1213 | ||
1214 | return 0; | |
1215 | } | |
1216 | ||
1217 | /** | |
1218 | * alb_set_mac_address | |
1219 | * @bond: | |
1220 | * @addr: | |
1221 | * | |
1222 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1223 | * their dev_addr field to different addresses (based on their permanent hw | |
1224 | * addresses). | |
1225 | * | |
1226 | * For each slave, this function sets the interface to the new address and then | |
1227 | * changes its dev_addr field to its previous value. | |
1228 | * | |
1229 | * Unwinding assumes bond's mac address has not yet changed. | |
1230 | */ | |
1231 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1232 | { | |
81f23b13 | 1233 | struct slave *slave, *rollback_slave; |
9caff1e7 | 1234 | struct list_head *iter; |
dec1e90e | 1235 | struct sockaddr sa; |
81f23b13 | 1236 | char tmp_addr[ETH_ALEN]; |
1da177e4 | 1237 | int res; |
1da177e4 | 1238 | |
dec1e90e | 1239 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1240 | return 0; |
1da177e4 | 1241 | |
9caff1e7 | 1242 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 | 1243 | /* save net_device's current hw address */ |
ada0f863 | 1244 | ether_addr_copy(tmp_addr, slave->dev->dev_addr); |
1da177e4 LT |
1245 | |
1246 | res = dev_set_mac_address(slave->dev, addr); | |
1247 | ||
1248 | /* restore net_device's hw address */ | |
ada0f863 | 1249 | ether_addr_copy(slave->dev->dev_addr, tmp_addr); |
1da177e4 | 1250 | |
eb7cc59a | 1251 | if (res) |
1da177e4 | 1252 | goto unwind; |
1da177e4 LT |
1253 | } |
1254 | ||
1255 | return 0; | |
1256 | ||
1257 | unwind: | |
1258 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1259 | sa.sa_family = bond->dev->type; | |
1260 | ||
1261 | /* unwind from head to the slave that failed */ | |
9caff1e7 | 1262 | bond_for_each_slave(bond, rollback_slave, iter) { |
81f23b13 VF |
1263 | if (rollback_slave == slave) |
1264 | break; | |
ada0f863 | 1265 | ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr); |
81f23b13 | 1266 | dev_set_mac_address(rollback_slave->dev, &sa); |
ada0f863 | 1267 | ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr); |
1da177e4 LT |
1268 | } |
1269 | ||
1270 | return res; | |
1271 | } | |
1272 | ||
1273 | /************************ exported alb funcions ************************/ | |
1274 | ||
1275 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1276 | { | |
1277 | int res; | |
1278 | ||
1279 | res = tlb_initialize(bond); | |
35d75ee4 | 1280 | if (res) |
1da177e4 | 1281 | return res; |
1da177e4 LT |
1282 | |
1283 | if (rlb_enabled) { | |
1284 | bond->alb_info.rlb_enabled = 1; | |
1285 | /* initialize rlb */ | |
1286 | res = rlb_initialize(bond); | |
1287 | if (res) { | |
1288 | tlb_deinitialize(bond); | |
1289 | return res; | |
1290 | } | |
b76850ab MW |
1291 | } else { |
1292 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1293 | } |
1294 | ||
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | void bond_alb_deinitialize(struct bonding *bond) | |
1299 | { | |
1300 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1301 | ||
1302 | tlb_deinitialize(bond); | |
1303 | ||
dda0fd5c | 1304 | if (bond_info->rlb_enabled) |
1da177e4 | 1305 | rlb_deinitialize(bond); |
1da177e4 LT |
1306 | } |
1307 | ||
9a49aba1 MB |
1308 | static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, |
1309 | struct slave *tx_slave) | |
1310 | { | |
1311 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1312 | struct ethhdr *eth_data = eth_hdr(skb); | |
1313 | ||
1314 | if (!tx_slave) { | |
1315 | /* unbalanced or unassigned, send through primary */ | |
1316 | tx_slave = rcu_dereference(bond->curr_active_slave); | |
e9f0fb88 MB |
1317 | if (bond->params.tlb_dynamic_lb) |
1318 | bond_info->unbalanced_load += skb->len; | |
9a49aba1 MB |
1319 | } |
1320 | ||
8557cd74 | 1321 | if (tx_slave && bond_slave_can_tx(tx_slave)) { |
b5091b55 | 1322 | if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { |
9a49aba1 MB |
1323 | ether_addr_copy(eth_data->h_source, |
1324 | tx_slave->dev->dev_addr); | |
1325 | } | |
1326 | ||
1327 | bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1328 | goto out; | |
1329 | } | |
1330 | ||
e9f0fb88 | 1331 | if (tx_slave && bond->params.tlb_dynamic_lb) { |
4bab16d7 | 1332 | spin_lock(&bond->mode_lock); |
9a49aba1 | 1333 | __tlb_clear_slave(bond, tx_slave, 0); |
4bab16d7 | 1334 | spin_unlock(&bond->mode_lock); |
9a49aba1 MB |
1335 | } |
1336 | ||
1337 | /* no suitable interface, frame not sent */ | |
1338 | dev_kfree_skb_any(skb); | |
1339 | out: | |
1340 | return NETDEV_TX_OK; | |
1341 | } | |
1342 | ||
6b794c1c MB |
1343 | static int bond_tlb_update_slave_arr(struct bonding *bond, |
1344 | struct slave *skipslave) | |
1345 | { | |
1346 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1347 | struct slave *tx_slave; | |
1348 | struct list_head *iter; | |
1349 | struct tlb_up_slave *new_arr, *old_arr; | |
1350 | ||
1351 | new_arr = kzalloc(offsetof(struct tlb_up_slave, arr[bond->slave_cnt]), | |
1352 | GFP_ATOMIC); | |
1353 | if (!new_arr) | |
1354 | return -ENOMEM; | |
1355 | ||
1356 | bond_for_each_slave(bond, tx_slave, iter) { | |
1357 | if (!bond_slave_can_tx(tx_slave)) | |
1358 | continue; | |
1359 | if (skipslave == tx_slave) | |
1360 | continue; | |
1361 | new_arr->arr[new_arr->count++] = tx_slave; | |
1362 | } | |
1363 | ||
1364 | old_arr = rtnl_dereference(bond_info->slave_arr); | |
1365 | rcu_assign_pointer(bond_info->slave_arr, new_arr); | |
1366 | if (old_arr) | |
1367 | kfree_rcu(old_arr, rcu); | |
1368 | ||
1369 | return 0; | |
1370 | } | |
1371 | ||
f05b42ea MB |
1372 | int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
1373 | { | |
1374 | struct bonding *bond = netdev_priv(bond_dev); | |
6b794c1c | 1375 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
f05b42ea MB |
1376 | struct ethhdr *eth_data; |
1377 | struct slave *tx_slave = NULL; | |
1378 | u32 hash_index; | |
1379 | ||
1380 | skb_reset_mac_header(skb); | |
1381 | eth_data = eth_hdr(skb); | |
1382 | ||
1383 | /* Do not TX balance any multicast or broadcast */ | |
1384 | if (!is_multicast_ether_addr(eth_data->h_dest)) { | |
1385 | switch (skb->protocol) { | |
1386 | case htons(ETH_P_IP): | |
1387 | case htons(ETH_P_IPX): | |
1388 | /* In case of IPX, it will falback to L2 hash */ | |
1389 | case htons(ETH_P_IPV6): | |
1390 | hash_index = bond_xmit_hash(bond, skb); | |
e9f0fb88 MB |
1391 | if (bond->params.tlb_dynamic_lb) { |
1392 | tx_slave = tlb_choose_channel(bond, | |
1393 | hash_index & 0xFF, | |
1394 | skb->len); | |
1395 | } else { | |
6b794c1c | 1396 | struct tlb_up_slave *slaves; |
e9f0fb88 | 1397 | |
6b794c1c MB |
1398 | slaves = rcu_dereference(bond_info->slave_arr); |
1399 | if (slaves && slaves->count) | |
1400 | tx_slave = slaves->arr[hash_index % | |
1401 | slaves->count]; | |
e9f0fb88 | 1402 | } |
f05b42ea MB |
1403 | break; |
1404 | } | |
1405 | } | |
f05b42ea MB |
1406 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1407 | } | |
1408 | ||
1da177e4 LT |
1409 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
1410 | { | |
454d7c9b | 1411 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1412 | struct ethhdr *eth_data; |
1413 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1414 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1415 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 | 1416 | int hash_size = 0; |
9a49aba1 | 1417 | bool do_tx_balance = true; |
1da177e4 | 1418 | u32 hash_index = 0; |
eddc9ec5 | 1419 | const u8 *hash_start = NULL; |
2d1ea19d | 1420 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1421 | |
459a98ed | 1422 | skb_reset_mac_header(skb); |
1da177e4 LT |
1423 | eth_data = eth_hdr(skb); |
1424 | ||
1da177e4 | 1425 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1426 | case ETH_P_IP: { |
1427 | const struct iphdr *iph = ip_hdr(skb); | |
1428 | ||
a6700db1 | 1429 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1430 | (iph->daddr == ip_bcast) || |
1431 | (iph->protocol == IPPROTO_IGMP)) { | |
9a49aba1 | 1432 | do_tx_balance = false; |
1da177e4 LT |
1433 | break; |
1434 | } | |
eddc9ec5 ACM |
1435 | hash_start = (char *)&(iph->daddr); |
1436 | hash_size = sizeof(iph->daddr); | |
1437 | } | |
1da177e4 LT |
1438 | break; |
1439 | case ETH_P_IPV6: | |
2d1ea19d VY |
1440 | /* IPv6 doesn't really use broadcast mac address, but leave |
1441 | * that here just in case. | |
1442 | */ | |
a6700db1 | 1443 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
9a49aba1 | 1444 | do_tx_balance = false; |
1da177e4 | 1445 | break; |
2d1ea19d VY |
1446 | } |
1447 | ||
1448 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1449 | * broadcasts in IPv4. | |
1450 | */ | |
a6700db1 | 1451 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
9a49aba1 | 1452 | do_tx_balance = false; |
2d1ea19d VY |
1453 | break; |
1454 | } | |
1455 | ||
1456 | /* Additianally, DAD probes should not be tx-balanced as that | |
1457 | * will lead to false positives for duplicate addresses and | |
1458 | * prevent address configuration from working. | |
1459 | */ | |
1460 | ip6hdr = ipv6_hdr(skb); | |
1461 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
9a49aba1 | 1462 | do_tx_balance = false; |
2d1ea19d | 1463 | break; |
1da177e4 LT |
1464 | } |
1465 | ||
0660e03f ACM |
1466 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1467 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1468 | break; |
1469 | case ETH_P_IPX: | |
d3bb52b0 | 1470 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 | 1471 | /* something is wrong with this packet */ |
9a49aba1 | 1472 | do_tx_balance = false; |
1da177e4 LT |
1473 | break; |
1474 | } | |
1475 | ||
1476 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1477 | /* The only protocol worth balancing in | |
1478 | * this family since it has an "ARP" like | |
1479 | * mechanism | |
1480 | */ | |
9a49aba1 | 1481 | do_tx_balance = false; |
1da177e4 LT |
1482 | break; |
1483 | } | |
1484 | ||
b85b6fb1 | 1485 | hash_start = (char *)eth_data->h_dest; |
1da177e4 LT |
1486 | hash_size = ETH_ALEN; |
1487 | break; | |
1488 | case ETH_P_ARP: | |
9a49aba1 | 1489 | do_tx_balance = false; |
dda0fd5c | 1490 | if (bond_info->rlb_enabled) |
1da177e4 | 1491 | tx_slave = rlb_arp_xmit(skb, bond); |
1da177e4 LT |
1492 | break; |
1493 | default: | |
9a49aba1 | 1494 | do_tx_balance = false; |
1da177e4 LT |
1495 | break; |
1496 | } | |
1497 | ||
1498 | if (do_tx_balance) { | |
1499 | hash_index = _simple_hash(hash_start, hash_size); | |
1500 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1501 | } | |
1502 | ||
9a49aba1 | 1503 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1da177e4 LT |
1504 | } |
1505 | ||
1b76b316 | 1506 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1507 | { |
1b76b316 JV |
1508 | struct bonding *bond = container_of(work, struct bonding, |
1509 | alb_work.work); | |
1da177e4 | 1510 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
9caff1e7 | 1511 | struct list_head *iter; |
1da177e4 | 1512 | struct slave *slave; |
1da177e4 | 1513 | |
0965a1f3 | 1514 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1515 | bond_info->tx_rebalance_counter = 0; |
1516 | bond_info->lp_counter = 0; | |
1517 | goto re_arm; | |
1518 | } | |
1519 | ||
733ab639 | 1520 | rcu_read_lock(); |
1521 | ||
1da177e4 LT |
1522 | bond_info->tx_rebalance_counter++; |
1523 | bond_info->lp_counter++; | |
1524 | ||
1525 | /* send learning packets */ | |
7eacd038 | 1526 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
d0c21d43 VY |
1527 | bool strict_match; |
1528 | ||
d0c21d43 VY |
1529 | bond_for_each_slave_rcu(bond, slave, iter) { |
1530 | /* If updating current_active, use all currently | |
1531 | * user mac addreses (!strict_match). Otherwise, only | |
1532 | * use mac of the slave device. | |
14af9963 | 1533 | * In RLB mode, we always use strict matches. |
d0c21d43 | 1534 | */ |
4740d638 | 1535 | strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || |
14af9963 | 1536 | bond_info->rlb_enabled); |
d0c21d43 VY |
1537 | alb_send_learning_packets(slave, slave->dev->dev_addr, |
1538 | strict_match); | |
1539 | } | |
1da177e4 LT |
1540 | bond_info->lp_counter = 0; |
1541 | } | |
1542 | ||
1543 | /* rebalance tx traffic */ | |
1544 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
733ab639 | 1545 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 | 1546 | tlb_clear_slave(bond, slave, 1); |
4740d638 | 1547 | if (slave == rcu_access_pointer(bond->curr_active_slave)) { |
1da177e4 LT |
1548 | SLAVE_TLB_INFO(slave).load = |
1549 | bond_info->unbalanced_load / | |
1550 | BOND_TLB_REBALANCE_INTERVAL; | |
1551 | bond_info->unbalanced_load = 0; | |
1552 | } | |
1553 | } | |
1da177e4 LT |
1554 | bond_info->tx_rebalance_counter = 0; |
1555 | } | |
1556 | ||
1557 | /* handle rlb stuff */ | |
1558 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1559 | if (bond_info->primary_is_promisc && |
1560 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1561 | ||
1f2cd845 DM |
1562 | /* |
1563 | * dev_set_promiscuity requires rtnl and | |
1564 | * nothing else. Avoid race with bond_close. | |
1565 | */ | |
733ab639 | 1566 | rcu_read_unlock(); |
1567 | if (!rtnl_trylock()) | |
1f2cd845 | 1568 | goto re_arm; |
1f2cd845 | 1569 | |
1da177e4 LT |
1570 | bond_info->rlb_promisc_timeout_counter = 0; |
1571 | ||
1572 | /* If the primary was set to promiscuous mode | |
1573 | * because a slave was disabled then | |
1574 | * it can now leave promiscuous mode. | |
1575 | */ | |
4740d638 ED |
1576 | dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev, |
1577 | -1); | |
1da177e4 | 1578 | bond_info->primary_is_promisc = 0; |
1f2cd845 DM |
1579 | |
1580 | rtnl_unlock(); | |
733ab639 | 1581 | rcu_read_lock(); |
d0e81b7e | 1582 | } |
1da177e4 LT |
1583 | |
1584 | if (bond_info->rlb_rebalance) { | |
1585 | bond_info->rlb_rebalance = 0; | |
1586 | rlb_rebalance(bond); | |
1587 | } | |
1588 | ||
1589 | /* check if clients need updating */ | |
1590 | if (bond_info->rx_ntt) { | |
1591 | if (bond_info->rlb_update_delay_counter) { | |
1592 | --bond_info->rlb_update_delay_counter; | |
1593 | } else { | |
1594 | rlb_update_rx_clients(bond); | |
dda0fd5c | 1595 | if (bond_info->rlb_update_retry_counter) |
1da177e4 | 1596 | --bond_info->rlb_update_retry_counter; |
dda0fd5c | 1597 | else |
1da177e4 | 1598 | bond_info->rx_ntt = 0; |
1da177e4 LT |
1599 | } |
1600 | } | |
1601 | } | |
733ab639 | 1602 | rcu_read_unlock(); |
1da177e4 | 1603 | re_arm: |
e6d265e8 | 1604 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1605 | } |
1606 | ||
1607 | /* assumption: called before the slave is attached to the bond | |
1608 | * and not locked by the bond lock | |
1609 | */ | |
1610 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1611 | { | |
1612 | int res; | |
1613 | ||
b924551b | 1614 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
dda0fd5c | 1615 | if (res) |
1da177e4 | 1616 | return res; |
1da177e4 | 1617 | |
1da177e4 | 1618 | res = alb_handle_addr_collision_on_attach(bond, slave); |
dda0fd5c | 1619 | if (res) |
1da177e4 | 1620 | return res; |
1da177e4 LT |
1621 | |
1622 | tlb_init_slave(slave); | |
1623 | ||
1624 | /* order a rebalance ASAP */ | |
1625 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1626 | ||
dda0fd5c | 1627 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1628 | bond->alb_info.rlb_rebalance = 1; |
1da177e4 LT |
1629 | |
1630 | return 0; | |
1631 | } | |
1632 | ||
2543331d JV |
1633 | /* |
1634 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1635 | * if necessary. | |
1636 | * | |
1637 | * Caller must hold RTNL and no other locks | |
1638 | */ | |
1da177e4 LT |
1639 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1640 | { | |
0965a1f3 | 1641 | if (bond_has_slaves(bond)) |
1da177e4 | 1642 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1643 | |
1644 | tlb_clear_slave(bond, slave, 0); | |
1645 | ||
1646 | if (bond->alb_info.rlb_enabled) { | |
6475ae4c | 1647 | bond->alb_info.rx_slave = NULL; |
1da177e4 LT |
1648 | rlb_clear_slave(bond, slave); |
1649 | } | |
6b794c1c MB |
1650 | |
1651 | if (bond_is_nondyn_tlb(bond)) | |
1652 | if (bond_tlb_update_slave_arr(bond, slave)) | |
1653 | pr_err("Failed to build slave-array for TLB mode.\n"); | |
1654 | ||
1da177e4 LT |
1655 | } |
1656 | ||
1da177e4 LT |
1657 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) |
1658 | { | |
1659 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1660 | ||
1661 | if (link == BOND_LINK_DOWN) { | |
1662 | tlb_clear_slave(bond, slave, 0); | |
73ac0cd4 | 1663 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1664 | rlb_clear_slave(bond, slave); |
1da177e4 LT |
1665 | } else if (link == BOND_LINK_UP) { |
1666 | /* order a rebalance ASAP */ | |
1667 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1668 | if (bond->alb_info.rlb_enabled) { | |
1669 | bond->alb_info.rlb_rebalance = 1; | |
1670 | /* If the updelay module parameter is smaller than the | |
1671 | * forwarding delay of the switch the rebalance will | |
1672 | * not work because the rebalance arp replies will | |
1673 | * not be forwarded to the clients.. | |
1674 | */ | |
1675 | } | |
1676 | } | |
6b794c1c MB |
1677 | |
1678 | if (bond_is_nondyn_tlb(bond)) { | |
1679 | if (bond_tlb_update_slave_arr(bond, NULL)) | |
1680 | pr_err("Failed to build slave-array for TLB mode.\n"); | |
1681 | } | |
1da177e4 LT |
1682 | } |
1683 | ||
1684 | /** | |
1685 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1686 | * @bond: our bonding struct | |
1687 | * @new_slave: new slave to assign | |
1688 | * | |
1689 | * Set the bond->curr_active_slave to @new_slave and handle | |
1690 | * mac address swapping and promiscuity changes as needed. | |
1691 | * | |
62c5f518 | 1692 | * Caller must hold RTNL |
1da177e4 LT |
1693 | */ |
1694 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1695 | { | |
1696 | struct slave *swap_slave; | |
4740d638 | 1697 | struct slave *curr_active; |
1da177e4 | 1698 | |
62c5f518 | 1699 | curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 | 1700 | if (curr_active == new_slave) |
1da177e4 | 1701 | return; |
1da177e4 | 1702 | |
4740d638 ED |
1703 | if (curr_active && bond->alb_info.primary_is_promisc) { |
1704 | dev_set_promiscuity(curr_active->dev, -1); | |
1da177e4 LT |
1705 | bond->alb_info.primary_is_promisc = 0; |
1706 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1707 | } | |
1708 | ||
4740d638 | 1709 | swap_slave = curr_active; |
278b2083 | 1710 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1711 | |
0965a1f3 | 1712 | if (!new_slave || !bond_has_slaves(bond)) |
1da177e4 | 1713 | return; |
1da177e4 LT |
1714 | |
1715 | /* set the new curr_active_slave to the bonds mac address | |
1716 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1717 | */ | |
b88ec38d VF |
1718 | if (!swap_slave) |
1719 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1720 | |
059fe7a5 JV |
1721 | /* |
1722 | * Arrange for swap_slave and new_slave to temporarily be | |
1723 | * ignored so we can mess with their MAC addresses without | |
1724 | * fear of interference from transmit activity. | |
1725 | */ | |
dec1e90e | 1726 | if (swap_slave) |
059fe7a5 | 1727 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1728 | tlb_clear_slave(bond, new_slave, 1); |
1729 | ||
4996b909 VF |
1730 | /* in TLB mode, the slave might flip down/up with the old dev_addr, |
1731 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1732 | */ | |
01844098 | 1733 | if (BOND_MODE(bond) == BOND_MODE_TLB) { |
4996b909 VF |
1734 | struct sockaddr sa; |
1735 | u8 tmp_addr[ETH_ALEN]; | |
1736 | ||
ada0f863 | 1737 | ether_addr_copy(tmp_addr, new_slave->dev->dev_addr); |
4996b909 VF |
1738 | |
1739 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1740 | sa.sa_family = bond->dev->type; | |
1741 | /* we don't care if it can't change its mac, best effort */ | |
1742 | dev_set_mac_address(new_slave->dev, &sa); | |
1743 | ||
ada0f863 | 1744 | ether_addr_copy(new_slave->dev->dev_addr, tmp_addr); |
4996b909 VF |
1745 | } |
1746 | ||
1da177e4 LT |
1747 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1748 | if (swap_slave) { | |
1749 | /* swap mac address */ | |
43547ea6 | 1750 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 JV |
1751 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
1752 | } else { | |
b88ec38d VF |
1753 | /* set the new_slave to the bond mac address */ |
1754 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); | |
d0c21d43 VY |
1755 | alb_send_learning_packets(new_slave, bond->dev->dev_addr, |
1756 | false); | |
1da177e4 LT |
1757 | } |
1758 | } | |
1759 | ||
ecfede42 | 1760 | /* Called with RTNL */ |
1da177e4 LT |
1761 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1762 | { | |
454d7c9b | 1763 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 | 1764 | struct sockaddr *sa = addr; |
4740d638 | 1765 | struct slave *curr_active; |
b88ec38d | 1766 | struct slave *swap_slave; |
1da177e4 | 1767 | int res; |
1da177e4 | 1768 | |
73ac0cd4 | 1769 | if (!is_valid_ether_addr(sa->sa_data)) |
1da177e4 | 1770 | return -EADDRNOTAVAIL; |
1da177e4 LT |
1771 | |
1772 | res = alb_set_mac_address(bond, addr); | |
73ac0cd4 | 1773 | if (res) |
1da177e4 | 1774 | return res; |
1da177e4 LT |
1775 | |
1776 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1777 | ||
1778 | /* If there is no curr_active_slave there is nothing else to do. | |
1779 | * Otherwise we'll need to pass the new address to it and handle | |
1780 | * duplications. | |
1781 | */ | |
4740d638 ED |
1782 | curr_active = rtnl_dereference(bond->curr_active_slave); |
1783 | if (!curr_active) | |
1da177e4 | 1784 | return 0; |
1da177e4 | 1785 | |
b88ec38d | 1786 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1787 | |
1788 | if (swap_slave) { | |
4740d638 ED |
1789 | alb_swap_mac_addr(swap_slave, curr_active); |
1790 | alb_fasten_mac_swap(bond, swap_slave, curr_active); | |
1da177e4 | 1791 | } else { |
4740d638 | 1792 | alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr); |
1da177e4 | 1793 | |
4740d638 | 1794 | alb_send_learning_packets(curr_active, |
d0c21d43 | 1795 | bond_dev->dev_addr, false); |
1da177e4 LT |
1796 | if (bond->alb_info.rlb_enabled) { |
1797 | /* inform clients mac address has changed */ | |
4740d638 | 1798 | rlb_req_update_slave_clients(bond, curr_active); |
1da177e4 LT |
1799 | } |
1800 | } | |
1801 | ||
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1806 | { | |
73ac0cd4 | 1807 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1808 | rlb_clear_vlan(bond, vlan_id); |
1da177e4 LT |
1809 | } |
1810 |