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 | 39 | #include <asm/byteorder.h> |
1ef8019b DM |
40 | #include <net/bonding.h> |
41 | #include <net/bond_alb.h> | |
1da177e4 | 42 | |
f87fda00 | 43 | static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = { |
885a136c ED |
44 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 |
45 | }; | |
1da177e4 LT |
46 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
47 | ||
48 | #pragma pack(1) | |
49 | struct learning_pkt { | |
50 | u8 mac_dst[ETH_ALEN]; | |
51 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 52 | __be16 type; |
1da177e4 LT |
53 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
54 | }; | |
55 | ||
56 | struct arp_pkt { | |
d3bb52b0 AV |
57 | __be16 hw_addr_space; |
58 | __be16 prot_addr_space; | |
1da177e4 LT |
59 | u8 hw_addr_len; |
60 | u8 prot_addr_len; | |
d3bb52b0 | 61 | __be16 op_code; |
1da177e4 | 62 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 63 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 64 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 65 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
66 | }; |
67 | #pragma pack() | |
68 | ||
a16aeb36 ACM |
69 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
70 | { | |
d56f90a7 | 71 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
72 | } |
73 | ||
1da177e4 | 74 | /* Forward declaration */ |
d0c21d43 VY |
75 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
76 | bool strict_match); | |
e53665c6 JB |
77 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
78 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
79 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
80 | u32 ip_dst_hash); | |
1da177e4 | 81 | |
eddc9ec5 | 82 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
83 | { |
84 | int i; | |
85 | u8 hash = 0; | |
86 | ||
fdb89d75 | 87 | for (i = 0; i < hash_size; i++) |
1da177e4 | 88 | hash ^= hash_start[i]; |
1da177e4 LT |
89 | |
90 | return hash; | |
91 | } | |
92 | ||
93 | /*********************** tlb specific functions ***************************/ | |
94 | ||
1da177e4 LT |
95 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) |
96 | { | |
97 | if (save_load) { | |
98 | entry->load_history = 1 + entry->tx_bytes / | |
99 | BOND_TLB_REBALANCE_INTERVAL; | |
100 | entry->tx_bytes = 0; | |
101 | } | |
102 | ||
103 | entry->tx_slave = NULL; | |
104 | entry->next = TLB_NULL_INDEX; | |
105 | entry->prev = TLB_NULL_INDEX; | |
106 | } | |
107 | ||
108 | static inline void tlb_init_slave(struct slave *slave) | |
109 | { | |
110 | SLAVE_TLB_INFO(slave).load = 0; | |
111 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
112 | } | |
113 | ||
f515e6b7 MU |
114 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, |
115 | int save_load) | |
1da177e4 LT |
116 | { |
117 | struct tlb_client_info *tx_hash_table; | |
118 | u32 index; | |
119 | ||
1da177e4 LT |
120 | /* clear slave from tx_hashtbl */ |
121 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
122 | ||
ce39a800 AG |
123 | /* skip this if we've already freed the tx hash table */ |
124 | if (tx_hash_table) { | |
125 | index = SLAVE_TLB_INFO(slave).head; | |
126 | while (index != TLB_NULL_INDEX) { | |
127 | u32 next_index = tx_hash_table[index].next; | |
128 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
129 | index = next_index; | |
130 | } | |
1da177e4 LT |
131 | } |
132 | ||
1da177e4 | 133 | tlb_init_slave(slave); |
f515e6b7 | 134 | } |
5af47b2f | 135 | |
f515e6b7 MU |
136 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, |
137 | int save_load) | |
138 | { | |
4bab16d7 | 139 | spin_lock_bh(&bond->mode_lock); |
f515e6b7 | 140 | __tlb_clear_slave(bond, slave, save_load); |
4bab16d7 | 141 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
142 | } |
143 | ||
144 | /* Must be called before starting the monitor timer */ | |
145 | static int tlb_initialize(struct bonding *bond) | |
146 | { | |
147 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
148 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 149 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
150 | int i; |
151 | ||
243cb4e5 | 152 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 153 | if (!new_hashtbl) |
6d9b6f42 | 154 | return -ENOMEM; |
e404decb | 155 | |
4bab16d7 | 156 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
157 | |
158 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 159 | |
fdb89d75 | 160 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) |
38dbaf0a | 161 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 | 162 | |
4bab16d7 | 163 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
168 | /* Must be called only after all slaves have been released */ | |
169 | static void tlb_deinitialize(struct bonding *bond) | |
170 | { | |
171 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
172 | ||
4bab16d7 | 173 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
174 | |
175 | kfree(bond_info->tx_hashtbl); | |
176 | bond_info->tx_hashtbl = NULL; | |
177 | ||
4bab16d7 | 178 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
179 | } |
180 | ||
097811bb JP |
181 | static long long compute_gap(struct slave *slave) |
182 | { | |
183 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
184 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
185 | } | |
186 | ||
1da177e4 LT |
187 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) |
188 | { | |
189 | struct slave *slave, *least_loaded; | |
9caff1e7 | 190 | struct list_head *iter; |
097811bb | 191 | long long max_gap; |
1da177e4 | 192 | |
097811bb JP |
193 | least_loaded = NULL; |
194 | max_gap = LLONG_MIN; | |
1da177e4 LT |
195 | |
196 | /* Find the slave with the largest gap */ | |
28c71926 | 197 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 198 | if (bond_slave_can_tx(slave)) { |
097811bb JP |
199 | long long gap = compute_gap(slave); |
200 | ||
1da177e4 LT |
201 | if (max_gap < gap) { |
202 | least_loaded = slave; | |
203 | max_gap = gap; | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
208 | return least_loaded; | |
209 | } | |
210 | ||
f515e6b7 MU |
211 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
212 | u32 skb_len) | |
1da177e4 LT |
213 | { |
214 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
215 | struct tlb_client_info *hash_table; | |
216 | struct slave *assigned_slave; | |
217 | ||
1da177e4 LT |
218 | hash_table = bond_info->tx_hashtbl; |
219 | assigned_slave = hash_table[hash_index].tx_slave; | |
220 | if (!assigned_slave) { | |
221 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
222 | ||
223 | if (assigned_slave) { | |
224 | struct tlb_slave_info *slave_info = | |
225 | &(SLAVE_TLB_INFO(assigned_slave)); | |
226 | u32 next_index = slave_info->head; | |
227 | ||
228 | hash_table[hash_index].tx_slave = assigned_slave; | |
229 | hash_table[hash_index].next = next_index; | |
230 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
231 | ||
fdb89d75 | 232 | if (next_index != TLB_NULL_INDEX) |
1da177e4 | 233 | hash_table[next_index].prev = hash_index; |
1da177e4 LT |
234 | |
235 | slave_info->head = hash_index; | |
236 | slave_info->load += | |
237 | hash_table[hash_index].load_history; | |
238 | } | |
239 | } | |
240 | ||
fdb89d75 | 241 | if (assigned_slave) |
1da177e4 | 242 | hash_table[hash_index].tx_bytes += skb_len; |
1da177e4 | 243 | |
1da177e4 LT |
244 | return assigned_slave; |
245 | } | |
246 | ||
f515e6b7 MU |
247 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, |
248 | u32 skb_len) | |
249 | { | |
250 | struct slave *tx_slave; | |
547942ca NA |
251 | |
252 | /* We don't need to disable softirq here, becase | |
f515e6b7 MU |
253 | * tlb_choose_channel() is only called by bond_alb_xmit() |
254 | * which already has softirq disabled. | |
255 | */ | |
4bab16d7 | 256 | spin_lock(&bond->mode_lock); |
f515e6b7 | 257 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); |
4bab16d7 | 258 | spin_unlock(&bond->mode_lock); |
547942ca | 259 | |
f515e6b7 MU |
260 | return tx_slave; |
261 | } | |
262 | ||
1da177e4 | 263 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 264 | |
1da177e4 LT |
265 | /* when an ARP REPLY is received from a client update its info |
266 | * in the rx_hashtbl | |
267 | */ | |
268 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
269 | { | |
270 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
271 | struct rlb_client_info *client_info; | |
272 | u32 hash_index; | |
273 | ||
4bab16d7 | 274 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 275 | |
b85b6fb1 | 276 | hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
1da177e4 LT |
277 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
278 | ||
279 | if ((client_info->assigned) && | |
280 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 281 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 282 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 | 283 | /* update the clients MAC address */ |
ada0f863 | 284 | ether_addr_copy(client_info->mac_dst, arp->mac_src); |
1da177e4 LT |
285 | client_info->ntt = 1; |
286 | bond_info->rx_ntt = 1; | |
287 | } | |
288 | ||
4bab16d7 | 289 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
290 | } |
291 | ||
de063b70 ED |
292 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
293 | struct slave *slave) | |
1da177e4 | 294 | { |
de063b70 | 295 | struct arp_pkt *arp, _arp; |
1da177e4 | 296 | |
3aba891d | 297 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 298 | goto out; |
1da177e4 | 299 | |
de063b70 ED |
300 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
301 | if (!arp) | |
b99215cd | 302 | goto out; |
1da177e4 | 303 | |
e53665c6 JB |
304 | /* We received an ARP from arp->ip_src. |
305 | * We might have used this IP address previously (on the bonding host | |
306 | * itself or on a system that is bridged together with the bond). | |
307 | * However, if arp->mac_src is different than what is stored in | |
308 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
309 | * sending out client updates with this IP address and the old MAC | |
310 | * address. | |
311 | * Clean up all hash table entries that have this address as ip_src but | |
312 | * have a different mac_src. | |
313 | */ | |
314 | rlb_purge_src_ip(bond, arp); | |
315 | ||
1da177e4 LT |
316 | if (arp->op_code == htons(ARPOP_REPLY)) { |
317 | /* update rx hash table for this ARP */ | |
318 | rlb_update_entry_from_arp(bond, arp); | |
0a111a03 | 319 | netdev_dbg(bond->dev, "Server received an ARP Reply from client\n"); |
1da177e4 | 320 | } |
b99215cd DM |
321 | out: |
322 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
323 | } |
324 | ||
56924c38 NA |
325 | /* Caller must hold rcu_read_lock() */ |
326 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
1da177e4 LT |
327 | { |
328 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6475ae4c VF |
329 | struct slave *before = NULL, *rx_slave = NULL, *slave; |
330 | struct list_head *iter; | |
331 | bool found = false; | |
1da177e4 | 332 | |
56924c38 | 333 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 334 | if (!bond_slave_can_tx(slave)) |
6475ae4c VF |
335 | continue; |
336 | if (!found) { | |
337 | if (!before || before->speed < slave->speed) | |
338 | before = slave; | |
339 | } else { | |
340 | if (!rx_slave || rx_slave->speed < slave->speed) | |
1da177e4 | 341 | rx_slave = slave; |
1da177e4 | 342 | } |
6475ae4c VF |
343 | if (slave == bond_info->rx_slave) |
344 | found = true; | |
1da177e4 | 345 | } |
6475ae4c VF |
346 | /* we didn't find anything after the current or we have something |
347 | * better before and up to the current slave | |
348 | */ | |
349 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
350 | rx_slave = before; | |
1da177e4 | 351 | |
6475ae4c VF |
352 | if (rx_slave) |
353 | bond_info->rx_slave = rx_slave; | |
1da177e4 LT |
354 | |
355 | return rx_slave; | |
356 | } | |
357 | ||
56924c38 NA |
358 | /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */ |
359 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
28c71926 | 360 | { |
56924c38 | 361 | struct slave *rx_slave; |
28c71926 | 362 | |
56924c38 | 363 | ASSERT_RTNL(); |
28c71926 | 364 | |
56924c38 NA |
365 | rcu_read_lock(); |
366 | rx_slave = __rlb_next_rx_slave(bond); | |
367 | rcu_read_unlock(); | |
28c71926 | 368 | |
369 | return rx_slave; | |
370 | } | |
371 | ||
1da177e4 LT |
372 | /* teach the switch the mac of a disabled slave |
373 | * on the primary for fault tolerance | |
374 | * | |
62c5f518 | 375 | * Caller must hold RTNL |
1da177e4 LT |
376 | */ |
377 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
378 | { | |
1c72cfdc | 379 | struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 ED |
380 | |
381 | if (!curr_active) | |
1da177e4 | 382 | return; |
1da177e4 LT |
383 | |
384 | if (!bond->alb_info.primary_is_promisc) { | |
4740d638 | 385 | if (!dev_set_promiscuity(curr_active->dev, 1)) |
7e1a1ac1 WC |
386 | bond->alb_info.primary_is_promisc = 1; |
387 | else | |
388 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
389 | } |
390 | ||
391 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
392 | ||
4740d638 | 393 | alb_send_learning_packets(curr_active, addr, true); |
1da177e4 LT |
394 | } |
395 | ||
396 | /* slave being removed should not be active at this point | |
397 | * | |
b2e7aceb | 398 | * Caller must hold rtnl. |
1da177e4 LT |
399 | */ |
400 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
401 | { | |
402 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
403 | struct rlb_client_info *rx_hash_table; | |
404 | u32 index, next_index; | |
405 | ||
406 | /* clear slave from rx_hashtbl */ | |
4bab16d7 | 407 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
408 | |
409 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 410 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 411 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 412 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
413 | if (rx_hash_table[index].slave == slave) { |
414 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
415 | ||
416 | if (assigned_slave) { | |
417 | rx_hash_table[index].slave = assigned_slave; | |
cbeeea70 | 418 | if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) { |
1da177e4 LT |
419 | bond_info->rx_hashtbl[index].ntt = 1; |
420 | bond_info->rx_ntt = 1; | |
421 | /* A slave has been removed from the | |
422 | * table because it is either disabled | |
423 | * or being released. We must retry the | |
424 | * update to avoid clients from not | |
425 | * being updated & disconnecting when | |
426 | * there is stress | |
427 | */ | |
428 | bond_info->rlb_update_retry_counter = | |
429 | RLB_UPDATE_RETRY; | |
430 | } | |
431 | } else { /* there is no active slave */ | |
432 | rx_hash_table[index].slave = NULL; | |
433 | } | |
434 | } | |
435 | } | |
436 | ||
4bab16d7 | 437 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 438 | |
1c72cfdc | 439 | if (slave != rtnl_dereference(bond->curr_active_slave)) |
1da177e4 | 440 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); |
1da177e4 LT |
441 | } |
442 | ||
443 | static void rlb_update_client(struct rlb_client_info *client_info) | |
444 | { | |
445 | int i; | |
446 | ||
4fa8667c | 447 | if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst)) |
1da177e4 | 448 | return; |
1da177e4 LT |
449 | |
450 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
451 | struct sk_buff *skb; | |
452 | ||
453 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
454 | client_info->ip_dst, | |
455 | client_info->slave->dev, | |
456 | client_info->ip_src, | |
457 | client_info->mac_dst, | |
458 | client_info->slave->dev->dev_addr, | |
459 | client_info->mac_dst); | |
460 | if (!skb) { | |
0a111a03 VF |
461 | netdev_err(client_info->slave->bond->dev, |
462 | "failed to create an ARP packet\n"); | |
1da177e4 LT |
463 | continue; |
464 | } | |
465 | ||
466 | skb->dev = client_info->slave->dev; | |
467 | ||
d3ab3ffd | 468 | if (client_info->vlan_id) { |
b4bef1b5 JP |
469 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), |
470 | client_info->vlan_id); | |
1da177e4 LT |
471 | } |
472 | ||
473 | arp_xmit(skb); | |
474 | } | |
475 | } | |
476 | ||
477 | /* sends ARP REPLIES that update the clients that need updating */ | |
478 | static void rlb_update_rx_clients(struct bonding *bond) | |
479 | { | |
480 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
481 | struct rlb_client_info *client_info; | |
482 | u32 hash_index; | |
483 | ||
4bab16d7 | 484 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 485 | |
e53665c6 JB |
486 | hash_index = bond_info->rx_hashtbl_used_head; |
487 | for (; hash_index != RLB_NULL_INDEX; | |
488 | hash_index = client_info->used_next) { | |
1da177e4 LT |
489 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
490 | if (client_info->ntt) { | |
491 | rlb_update_client(client_info); | |
35d75ee4 | 492 | if (bond_info->rlb_update_retry_counter == 0) |
1da177e4 | 493 | client_info->ntt = 0; |
1da177e4 LT |
494 | } |
495 | } | |
496 | ||
94e2bd68 | 497 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
498 | * not to confuse the clients. |
499 | */ | |
500 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
501 | ||
4bab16d7 | 502 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
503 | } |
504 | ||
505 | /* The slave was assigned a new mac address - update the clients */ | |
506 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
507 | { | |
508 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
509 | struct rlb_client_info *client_info; | |
510 | int ntt = 0; | |
511 | u32 hash_index; | |
512 | ||
4bab16d7 | 513 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 514 | |
e53665c6 JB |
515 | hash_index = bond_info->rx_hashtbl_used_head; |
516 | for (; hash_index != RLB_NULL_INDEX; | |
517 | hash_index = client_info->used_next) { | |
1da177e4 LT |
518 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
519 | ||
520 | if ((client_info->slave == slave) && | |
cbeeea70 | 521 | is_valid_ether_addr(client_info->mac_dst)) { |
1da177e4 LT |
522 | client_info->ntt = 1; |
523 | ntt = 1; | |
524 | } | |
525 | } | |
526 | ||
4708a1b1 | 527 | /* update the team's flag only after the whole iteration */ |
1da177e4 LT |
528 | if (ntt) { |
529 | bond_info->rx_ntt = 1; | |
4708a1b1 | 530 | /* fasten the change */ |
1da177e4 LT |
531 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
532 | } | |
533 | ||
4bab16d7 | 534 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
535 | } |
536 | ||
537 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 538 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
539 | { |
540 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
541 | struct rlb_client_info *client_info; | |
542 | u32 hash_index; | |
543 | ||
4bab16d7 | 544 | spin_lock(&bond->mode_lock); |
1da177e4 | 545 | |
e53665c6 JB |
546 | hash_index = bond_info->rx_hashtbl_used_head; |
547 | for (; hash_index != RLB_NULL_INDEX; | |
548 | hash_index = client_info->used_next) { | |
1da177e4 LT |
549 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
550 | ||
551 | if (!client_info->slave) { | |
0a111a03 | 552 | netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); |
1da177e4 LT |
553 | continue; |
554 | } | |
547942ca | 555 | /* update all clients using this src_ip, that are not assigned |
1da177e4 LT |
556 | * to the team's address (curr_active_slave) and have a known |
557 | * unicast mac address. | |
558 | */ | |
559 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
560 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
561 | bond->dev->dev_addr) && | |
cbeeea70 | 562 | is_valid_ether_addr(client_info->mac_dst)) { |
1da177e4 LT |
563 | client_info->ntt = 1; |
564 | bond_info->rx_ntt = 1; | |
565 | } | |
566 | } | |
567 | ||
4bab16d7 | 568 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
569 | } |
570 | ||
1da177e4 LT |
571 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) |
572 | { | |
573 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 574 | struct arp_pkt *arp = arp_pkt(skb); |
28c71926 | 575 | struct slave *assigned_slave, *curr_active_slave; |
1da177e4 LT |
576 | struct rlb_client_info *client_info; |
577 | u32 hash_index = 0; | |
578 | ||
4bab16d7 | 579 | spin_lock(&bond->mode_lock); |
1da177e4 | 580 | |
28c71926 | 581 | curr_active_slave = rcu_dereference(bond->curr_active_slave); |
582 | ||
e364a341 | 583 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
584 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
585 | ||
586 | if (client_info->assigned) { | |
587 | if ((client_info->ip_src == arp->ip_src) && | |
588 | (client_info->ip_dst == arp->ip_dst)) { | |
589 | /* the entry is already assigned to this client */ | |
cbeeea70 | 590 | if (!is_broadcast_ether_addr(arp->mac_dst)) { |
1da177e4 | 591 | /* update mac address from arp */ |
ada0f863 | 592 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
1da177e4 | 593 | } |
ada0f863 | 594 | ether_addr_copy(client_info->mac_src, arp->mac_src); |
1da177e4 LT |
595 | |
596 | assigned_slave = client_info->slave; | |
597 | if (assigned_slave) { | |
4bab16d7 | 598 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
599 | return assigned_slave; |
600 | } | |
601 | } else { | |
602 | /* the entry is already assigned to some other client, | |
603 | * move the old client to primary (curr_active_slave) so | |
604 | * that the new client can be assigned to this entry. | |
605 | */ | |
4740d638 | 606 | if (curr_active_slave && |
28c71926 | 607 | client_info->slave != curr_active_slave) { |
608 | client_info->slave = curr_active_slave; | |
1da177e4 LT |
609 | rlb_update_client(client_info); |
610 | } | |
611 | } | |
612 | } | |
613 | /* assign a new slave */ | |
28c71926 | 614 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
615 | |
616 | if (assigned_slave) { | |
e53665c6 JB |
617 | if (!(client_info->assigned && |
618 | client_info->ip_src == arp->ip_src)) { | |
619 | /* ip_src is going to be updated, | |
620 | * fix the src hash list | |
621 | */ | |
622 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
623 | sizeof(arp->ip_src)); | |
624 | rlb_src_unlink(bond, hash_index); | |
625 | rlb_src_link(bond, hash_src, hash_index); | |
626 | } | |
627 | ||
1da177e4 LT |
628 | client_info->ip_src = arp->ip_src; |
629 | client_info->ip_dst = arp->ip_dst; | |
630 | /* arp->mac_dst is broadcast for arp reqeusts. | |
631 | * will be updated with clients actual unicast mac address | |
632 | * upon receiving an arp reply. | |
633 | */ | |
ada0f863 JP |
634 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
635 | ether_addr_copy(client_info->mac_src, arp->mac_src); | |
1da177e4 LT |
636 | client_info->slave = assigned_slave; |
637 | ||
cbeeea70 | 638 | if (is_valid_ether_addr(client_info->mac_dst)) { |
1da177e4 LT |
639 | client_info->ntt = 1; |
640 | bond->alb_info.rx_ntt = 1; | |
641 | } else { | |
642 | client_info->ntt = 0; | |
643 | } | |
644 | ||
fb00bc2e | 645 | if (vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 646 | client_info->vlan_id = 0; |
1da177e4 LT |
647 | |
648 | if (!client_info->assigned) { | |
e53665c6 JB |
649 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
650 | bond_info->rx_hashtbl_used_head = hash_index; | |
651 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 652 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 653 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
654 | hash_index; |
655 | } | |
656 | client_info->assigned = 1; | |
657 | } | |
658 | } | |
659 | ||
4bab16d7 | 660 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
661 | |
662 | return assigned_slave; | |
663 | } | |
664 | ||
665 | /* chooses (and returns) transmit channel for arp reply | |
666 | * does not choose channel for other arp types since they are | |
667 | * sent on the curr_active_slave | |
668 | */ | |
669 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
670 | { | |
a16aeb36 | 671 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
672 | struct slave *tx_slave = NULL; |
673 | ||
567b871e | 674 | /* Don't modify or load balance ARPs that do not originate locally |
675 | * (e.g.,arrive via a bridge). | |
676 | */ | |
14af9963 | 677 | if (!bond_slave_has_mac_rx(bond, arp->mac_src)) |
567b871e | 678 | return NULL; |
679 | ||
f14c4e4e | 680 | if (arp->op_code == htons(ARPOP_REPLY)) { |
547942ca | 681 | /* the arp must be sent on the selected rx channel */ |
1da177e4 | 682 | tx_slave = rlb_choose_channel(skb, bond); |
35d75ee4 | 683 | if (tx_slave) |
faeeb317 JW |
684 | bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr, |
685 | tx_slave->dev->addr_len); | |
0a111a03 | 686 | netdev_dbg(bond->dev, "Server sent ARP Reply packet\n"); |
f14c4e4e | 687 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
688 | /* Create an entry in the rx_hashtbl for this client as a |
689 | * place holder. | |
690 | * When the arp reply is received the entry will be updated | |
691 | * with the correct unicast address of the client. | |
692 | */ | |
693 | rlb_choose_channel(skb, bond); | |
694 | ||
77c8e2c0 | 695 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
696 | * they can cancel out the influence of the ARP request. |
697 | */ | |
698 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
699 | ||
700 | /* arp requests are broadcast and are sent on the primary | |
701 | * the arp request will collapse all clients on the subnet to | |
702 | * the primary slave. We must register these clients to be | |
703 | * updated with their assigned mac. | |
704 | */ | |
705 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
0a111a03 | 706 | netdev_dbg(bond->dev, "Server sent ARP Request packet\n"); |
1da177e4 LT |
707 | } |
708 | ||
709 | return tx_slave; | |
710 | } | |
711 | ||
1da177e4 LT |
712 | static void rlb_rebalance(struct bonding *bond) |
713 | { | |
714 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
715 | struct slave *assigned_slave; | |
716 | struct rlb_client_info *client_info; | |
717 | int ntt; | |
718 | u32 hash_index; | |
719 | ||
4bab16d7 | 720 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
721 | |
722 | ntt = 0; | |
e53665c6 JB |
723 | hash_index = bond_info->rx_hashtbl_used_head; |
724 | for (; hash_index != RLB_NULL_INDEX; | |
725 | hash_index = client_info->used_next) { | |
1da177e4 | 726 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
733ab639 | 727 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
728 | if (assigned_slave && (client_info->slave != assigned_slave)) { |
729 | client_info->slave = assigned_slave; | |
25780410 DB |
730 | if (!is_zero_ether_addr(client_info->mac_dst)) { |
731 | client_info->ntt = 1; | |
732 | ntt = 1; | |
733 | } | |
1da177e4 LT |
734 | } |
735 | } | |
736 | ||
737 | /* update the team's flag only after the whole iteration */ | |
35d75ee4 | 738 | if (ntt) |
1da177e4 | 739 | bond_info->rx_ntt = 1; |
4bab16d7 | 740 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
741 | } |
742 | ||
547942ca | 743 | /* Caller must hold mode_lock */ |
e53665c6 JB |
744 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
745 | { | |
746 | entry->used_next = RLB_NULL_INDEX; | |
747 | entry->used_prev = RLB_NULL_INDEX; | |
748 | entry->assigned = 0; | |
749 | entry->slave = NULL; | |
d3ab3ffd | 750 | entry->vlan_id = 0; |
e53665c6 JB |
751 | } |
752 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
753 | { | |
754 | entry->src_first = RLB_NULL_INDEX; | |
755 | entry->src_prev = RLB_NULL_INDEX; | |
756 | entry->src_next = RLB_NULL_INDEX; | |
757 | } | |
758 | ||
1da177e4 LT |
759 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
760 | { | |
761 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
762 | rlb_init_table_entry_dst(entry); |
763 | rlb_init_table_entry_src(entry); | |
764 | } | |
765 | ||
766 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
767 | { | |
768 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
769 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
770 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
771 | ||
772 | if (index == bond_info->rx_hashtbl_used_head) | |
773 | bond_info->rx_hashtbl_used_head = next_index; | |
774 | if (prev_index != RLB_NULL_INDEX) | |
775 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
776 | if (next_index != RLB_NULL_INDEX) | |
777 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
778 | } | |
779 | ||
780 | /* unlink a rlb hash table entry from the src list */ | |
781 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
782 | { | |
783 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
784 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
785 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
786 | ||
787 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
788 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
789 | ||
790 | if (next_index != RLB_NULL_INDEX) | |
791 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
792 | ||
793 | if (prev_index == RLB_NULL_INDEX) | |
794 | return; | |
795 | ||
796 | /* is prev_index pointing to the head of this list? */ | |
797 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
798 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
799 | else | |
800 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
801 | ||
802 | } | |
803 | ||
804 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
805 | { | |
806 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
807 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
808 | ||
809 | rlb_delete_table_entry_dst(bond, index); | |
810 | rlb_init_table_entry_dst(entry); | |
811 | ||
812 | rlb_src_unlink(bond, index); | |
813 | } | |
814 | ||
815 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
816 | * of entries with identical ip_src_hash | |
817 | */ | |
818 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
819 | { | |
820 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
821 | u32 next; | |
822 | ||
823 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
824 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
825 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
826 | if (next != RLB_NULL_INDEX) | |
827 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
828 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
829 | } | |
830 | ||
547942ca NA |
831 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does |
832 | * not match arp->mac_src | |
833 | */ | |
e53665c6 JB |
834 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) |
835 | { | |
836 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
b85b6fb1 | 837 | u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
e53665c6 JB |
838 | u32 index; |
839 | ||
4bab16d7 | 840 | spin_lock_bh(&bond->mode_lock); |
e53665c6 JB |
841 | |
842 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
843 | while (index != RLB_NULL_INDEX) { | |
844 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
845 | u32 next_index = entry->src_next; | |
846 | if (entry->ip_src == arp->ip_src && | |
847 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
848 | rlb_delete_table_entry(bond, index); | |
849 | index = next_index; | |
850 | } | |
4bab16d7 | 851 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
852 | } |
853 | ||
854 | static int rlb_initialize(struct bonding *bond) | |
855 | { | |
856 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 857 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
858 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
859 | int i; | |
860 | ||
0d206a3a | 861 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 862 | if (!new_hashtbl) |
1da177e4 | 863 | return -1; |
e404decb | 864 | |
4bab16d7 | 865 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
866 | |
867 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 868 | |
e53665c6 | 869 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 870 | |
35d75ee4 | 871 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) |
1da177e4 | 872 | rlb_init_table_entry(bond_info->rx_hashtbl + i); |
1da177e4 | 873 | |
4bab16d7 | 874 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 875 | |
1da177e4 | 876 | /* register to receive ARPs */ |
3aba891d | 877 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
878 | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static void rlb_deinitialize(struct bonding *bond) | |
883 | { | |
884 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
885 | ||
4bab16d7 | 886 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
887 | |
888 | kfree(bond_info->rx_hashtbl); | |
889 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 890 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 891 | |
4bab16d7 | 892 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
893 | } |
894 | ||
895 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
896 | { | |
897 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
898 | u32 curr_index; | |
899 | ||
4bab16d7 | 900 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 901 | |
e53665c6 | 902 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
903 | while (curr_index != RLB_NULL_INDEX) { |
904 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 905 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 906 | |
d3ab3ffd | 907 | if (curr->vlan_id == vlan_id) |
e53665c6 | 908 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
909 | |
910 | curr_index = next_index; | |
911 | } | |
912 | ||
4bab16d7 | 913 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
914 | } |
915 | ||
916 | /*********************** tlb/rlb shared functions *********************/ | |
917 | ||
7aa64981 | 918 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
d6b694c0 | 919 | __be16 vlan_proto, u16 vid) |
1da177e4 | 920 | { |
1da177e4 | 921 | struct learning_pkt pkt; |
7aa64981 | 922 | struct sk_buff *skb; |
1da177e4 | 923 | int size = sizeof(struct learning_pkt); |
1da177e4 LT |
924 | |
925 | memset(&pkt, 0, size); | |
ada0f863 JP |
926 | ether_addr_copy(pkt.mac_dst, mac_addr); |
927 | ether_addr_copy(pkt.mac_src, mac_addr); | |
96a0922c | 928 | pkt.type = cpu_to_be16(ETH_P_LOOPBACK); |
1da177e4 | 929 | |
7aa64981 VF |
930 | skb = dev_alloc_skb(size); |
931 | if (!skb) | |
932 | return; | |
1da177e4 | 933 | |
b952f4df | 934 | skb_put_data(skb, &pkt, size); |
7aa64981 VF |
935 | |
936 | skb_reset_mac_header(skb); | |
937 | skb->network_header = skb->mac_header + ETH_HLEN; | |
938 | skb->protocol = pkt.type; | |
939 | skb->priority = TC_PRIO_CONTROL; | |
940 | skb->dev = slave->dev; | |
941 | ||
21706ee8 DB |
942 | netdev_dbg(slave->bond->dev, |
943 | "Send learning packet: dev %s mac %pM vlan %d\n", | |
944 | slave->dev->name, mac_addr, vid); | |
945 | ||
b4bef1b5 JP |
946 | if (vid) |
947 | __vlan_hwaccel_put_tag(skb, vlan_proto, vid); | |
7aa64981 VF |
948 | |
949 | dev_queue_xmit(skb); | |
950 | } | |
1da177e4 | 951 | |
b3208b20 DA |
952 | struct alb_walk_data { |
953 | struct bonding *bond; | |
954 | struct slave *slave; | |
955 | u8 *mac_addr; | |
956 | bool strict_match; | |
957 | }; | |
958 | ||
959 | static int alb_upper_dev_walk(struct net_device *upper, void *_data) | |
960 | { | |
961 | struct alb_walk_data *data = _data; | |
962 | bool strict_match = data->strict_match; | |
963 | struct bonding *bond = data->bond; | |
964 | struct slave *slave = data->slave; | |
965 | u8 *mac_addr = data->mac_addr; | |
966 | struct bond_vlan_tag *tags; | |
967 | ||
21706ee8 DB |
968 | if (is_vlan_dev(upper) && |
969 | bond->nest_level == vlan_get_encap_level(upper) - 1) { | |
970 | if (upper->addr_assign_type == NET_ADDR_STOLEN) { | |
b3208b20 DA |
971 | alb_send_lp_vid(slave, mac_addr, |
972 | vlan_dev_vlan_proto(upper), | |
973 | vlan_dev_vlan_id(upper)); | |
21706ee8 | 974 | } else { |
b3208b20 DA |
975 | alb_send_lp_vid(slave, upper->dev_addr, |
976 | vlan_dev_vlan_proto(upper), | |
977 | vlan_dev_vlan_id(upper)); | |
978 | } | |
979 | } | |
980 | ||
981 | /* If this is a macvlan device, then only send updates | |
982 | * when strict_match is turned off. | |
983 | */ | |
984 | if (netif_is_macvlan(upper) && !strict_match) { | |
985 | tags = bond_verify_device_path(bond->dev, upper, 0); | |
986 | if (IS_ERR_OR_NULL(tags)) | |
987 | BUG(); | |
988 | alb_send_lp_vid(slave, upper->dev_addr, | |
989 | tags[0].vlan_proto, tags[0].vlan_id); | |
990 | kfree(tags); | |
991 | } | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
d0c21d43 VY |
996 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
997 | bool strict_match) | |
7aa64981 VF |
998 | { |
999 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
b3208b20 DA |
1000 | struct alb_walk_data data = { |
1001 | .strict_match = strict_match, | |
1002 | .mac_addr = mac_addr, | |
1003 | .slave = slave, | |
1004 | .bond = bond, | |
1005 | }; | |
5bf94b83 VF |
1006 | |
1007 | /* send untagged */ | |
d6b694c0 | 1008 | alb_send_lp_vid(slave, mac_addr, 0, 0); |
5bf94b83 | 1009 | |
14af9963 VY |
1010 | /* loop through all devices and see if we need to send a packet |
1011 | * for that device. | |
1012 | */ | |
5bf94b83 | 1013 | rcu_read_lock(); |
b3208b20 | 1014 | netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data); |
5bf94b83 | 1015 | rcu_read_unlock(); |
1da177e4 LT |
1016 | } |
1017 | ||
faeeb317 JW |
1018 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], |
1019 | unsigned int len) | |
1da177e4 LT |
1020 | { |
1021 | struct net_device *dev = slave->dev; | |
faeeb317 | 1022 | struct sockaddr_storage ss; |
1da177e4 | 1023 | |
01844098 | 1024 | if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { |
faeeb317 | 1025 | memcpy(dev->dev_addr, addr, len); |
1da177e4 LT |
1026 | return 0; |
1027 | } | |
1028 | ||
547942ca NA |
1029 | /* for rlb each slave must have a unique hw mac addresses so that |
1030 | * each slave will receive packets destined to a different mac | |
1031 | */ | |
faeeb317 JW |
1032 | memcpy(ss.__data, addr, len); |
1033 | ss.ss_family = dev->type; | |
3a37a963 | 1034 | if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) { |
0a111a03 VF |
1035 | 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", |
1036 | dev->name); | |
1da177e4 LT |
1037 | return -EOPNOTSUPP; |
1038 | } | |
1039 | return 0; | |
1040 | } | |
1041 | ||
547942ca | 1042 | /* Swap MAC addresses between two slaves. |
059fe7a5 JV |
1043 | * |
1044 | * Called with RTNL held, and no other locks. | |
059fe7a5 | 1045 | */ |
43547ea6 | 1046 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1047 | { |
faeeb317 | 1048 | u8 tmp_mac_addr[MAX_ADDR_LEN]; |
1da177e4 | 1049 | |
faeeb317 JW |
1050 | bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr, |
1051 | slave1->dev->addr_len); | |
1052 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, | |
1053 | slave2->dev->addr_len); | |
1054 | alb_set_slave_mac_addr(slave2, tmp_mac_addr, | |
1055 | slave1->dev->addr_len); | |
1da177e4 | 1056 | |
059fe7a5 JV |
1057 | } |
1058 | ||
547942ca | 1059 | /* Send learning packets after MAC address swap. |
059fe7a5 | 1060 | * |
2543331d | 1061 | * Called with RTNL and no other locks |
059fe7a5 JV |
1062 | */ |
1063 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1064 | struct slave *slave2) | |
1065 | { | |
8557cd74 | 1066 | int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); |
059fe7a5 JV |
1067 | struct slave *disabled_slave = NULL; |
1068 | ||
2543331d JV |
1069 | ASSERT_RTNL(); |
1070 | ||
1da177e4 | 1071 | /* fasten the change in the switch */ |
8557cd74 | 1072 | if (bond_slave_can_tx(slave1)) { |
d0c21d43 | 1073 | alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); |
1da177e4 LT |
1074 | if (bond->alb_info.rlb_enabled) { |
1075 | /* inform the clients that the mac address | |
1076 | * has changed | |
1077 | */ | |
1078 | rlb_req_update_slave_clients(bond, slave1); | |
1079 | } | |
1080 | } else { | |
1081 | disabled_slave = slave1; | |
1082 | } | |
1083 | ||
8557cd74 | 1084 | if (bond_slave_can_tx(slave2)) { |
d0c21d43 | 1085 | alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); |
1da177e4 LT |
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, slave2); | |
1091 | } | |
1092 | } else { | |
1093 | disabled_slave = slave2; | |
1094 | } | |
1095 | ||
1096 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1097 | /* A disabled slave was assigned an active mac addr */ | |
1098 | rlb_teach_disabled_mac_on_primary(bond, | |
1099 | disabled_slave->dev->dev_addr); | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * alb_change_hw_addr_on_detach | |
1105 | * @bond: bonding we're working on | |
1106 | * @slave: the slave that was just detached | |
1107 | * | |
1108 | * We assume that @slave was already detached from the slave list. | |
1109 | * | |
1110 | * If @slave's permanent hw address is different both from its current | |
1111 | * address and from @bond's address, then somewhere in the bond there's | |
1112 | * a slave that has @slave's permanet address as its current address. | |
1113 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1114 | * | |
2543331d | 1115 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1116 | */ |
1117 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1118 | { | |
1119 | int perm_curr_diff; | |
1120 | int perm_bond_diff; | |
b88ec38d | 1121 | struct slave *found_slave; |
1da177e4 | 1122 | |
a6700db1 JP |
1123 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1124 | slave->dev->dev_addr); | |
1125 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1126 | bond->dev->dev_addr); | |
1da177e4 LT |
1127 | |
1128 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1129 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1130 | |
b88ec38d | 1131 | if (found_slave) { |
b88ec38d VF |
1132 | alb_swap_mac_addr(slave, found_slave); |
1133 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1134 | } |
1135 | } | |
1136 | } | |
1137 | ||
1138 | /** | |
1139 | * alb_handle_addr_collision_on_attach | |
1140 | * @bond: bonding we're working on | |
1141 | * @slave: the slave that was just attached | |
1142 | * | |
1143 | * checks uniqueness of slave's mac address and handles the case the | |
1144 | * new slave uses the bonds mac address. | |
1145 | * | |
1146 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1147 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1148 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1149 | * addresses of the other slaves. |
1150 | * | |
1151 | * We go over the slave list, and for each slave there we compare its | |
1152 | * permanent hw address with the current address of all the other slaves. | |
1153 | * If no match was found, then we've found a slave with a permanent address | |
1154 | * that isn't used by any other slave in the bond, so we can assign it to | |
1155 | * @slave. | |
1156 | * | |
1157 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1158 | * bond slave list. |
1da177e4 LT |
1159 | */ |
1160 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1161 | { | |
4740d638 | 1162 | struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); |
9caff1e7 VF |
1163 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1164 | struct list_head *iter; | |
1da177e4 | 1165 | |
0965a1f3 | 1166 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1167 | /* this is the first slave */ |
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | /* if slave's mac address differs from bond's mac address | |
1172 | * check uniqueness of slave's mac address against the other | |
1173 | * slaves in the bond. | |
1174 | */ | |
a6700db1 | 1175 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1176 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1177 | return 0; |
1da177e4 | 1178 | |
6b38aefe | 1179 | /* Try setting slave mac to bond address and fall-through |
547942ca NA |
1180 | * to code handling that situation below... |
1181 | */ | |
faeeb317 JW |
1182 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr, |
1183 | bond->dev->addr_len); | |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | /* The slave's address is equal to the address of the bond. | |
1187 | * Search for a spare address in the bond for this slave. | |
1188 | */ | |
9caff1e7 | 1189 | bond_for_each_slave(bond, tmp_slave1, iter) { |
cedb743f | 1190 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1191 | /* no slave has tmp_slave1's perm addr |
1192 | * as its curr addr | |
1193 | */ | |
1194 | free_mac_slave = tmp_slave1; | |
1195 | break; | |
1196 | } | |
1197 | ||
1198 | if (!has_bond_addr) { | |
a6700db1 JP |
1199 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1200 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1201 | |
1202 | has_bond_addr = tmp_slave1; | |
1203 | } | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | if (free_mac_slave) { | |
faeeb317 JW |
1208 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, |
1209 | free_mac_slave->dev->addr_len); | |
1da177e4 | 1210 | |
0a111a03 VF |
1211 | netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n", |
1212 | slave->dev->name, free_mac_slave->dev->name); | |
1da177e4 LT |
1213 | |
1214 | } else if (has_bond_addr) { | |
0a111a03 VF |
1215 | 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", |
1216 | slave->dev->name); | |
1da177e4 LT |
1217 | return -EFAULT; |
1218 | } | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | /** | |
1224 | * alb_set_mac_address | |
1225 | * @bond: | |
1226 | * @addr: | |
1227 | * | |
1228 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1229 | * their dev_addr field to different addresses (based on their permanent hw | |
1230 | * addresses). | |
1231 | * | |
1232 | * For each slave, this function sets the interface to the new address and then | |
1233 | * changes its dev_addr field to its previous value. | |
1234 | * | |
1235 | * Unwinding assumes bond's mac address has not yet changed. | |
1236 | */ | |
1237 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1238 | { | |
81f23b13 | 1239 | struct slave *slave, *rollback_slave; |
9caff1e7 | 1240 | struct list_head *iter; |
faeeb317 JW |
1241 | struct sockaddr_storage ss; |
1242 | char tmp_addr[MAX_ADDR_LEN]; | |
1da177e4 | 1243 | int res; |
1da177e4 | 1244 | |
dec1e90e | 1245 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1246 | return 0; |
1da177e4 | 1247 | |
9caff1e7 | 1248 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 | 1249 | /* save net_device's current hw address */ |
faeeb317 JW |
1250 | bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr, |
1251 | slave->dev->addr_len); | |
1da177e4 | 1252 | |
3a37a963 | 1253 | res = dev_set_mac_address(slave->dev, addr, NULL); |
1da177e4 LT |
1254 | |
1255 | /* restore net_device's hw address */ | |
faeeb317 JW |
1256 | bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr, |
1257 | slave->dev->addr_len); | |
1da177e4 | 1258 | |
eb7cc59a | 1259 | if (res) |
1da177e4 | 1260 | goto unwind; |
1da177e4 LT |
1261 | } |
1262 | ||
1263 | return 0; | |
1264 | ||
1265 | unwind: | |
faeeb317 JW |
1266 | memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len); |
1267 | ss.ss_family = bond->dev->type; | |
1da177e4 LT |
1268 | |
1269 | /* unwind from head to the slave that failed */ | |
9caff1e7 | 1270 | bond_for_each_slave(bond, rollback_slave, iter) { |
81f23b13 VF |
1271 | if (rollback_slave == slave) |
1272 | break; | |
faeeb317 JW |
1273 | bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr, |
1274 | rollback_slave->dev->addr_len); | |
1275 | dev_set_mac_address(rollback_slave->dev, | |
3a37a963 | 1276 | (struct sockaddr *)&ss, NULL); |
faeeb317 JW |
1277 | bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr, |
1278 | rollback_slave->dev->addr_len); | |
1da177e4 LT |
1279 | } |
1280 | ||
1281 | return res; | |
1282 | } | |
1283 | ||
1284 | /************************ exported alb funcions ************************/ | |
1285 | ||
1286 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1287 | { | |
1288 | int res; | |
1289 | ||
1290 | res = tlb_initialize(bond); | |
35d75ee4 | 1291 | if (res) |
1da177e4 | 1292 | return res; |
1da177e4 LT |
1293 | |
1294 | if (rlb_enabled) { | |
1295 | bond->alb_info.rlb_enabled = 1; | |
1da177e4 LT |
1296 | res = rlb_initialize(bond); |
1297 | if (res) { | |
1298 | tlb_deinitialize(bond); | |
1299 | return res; | |
1300 | } | |
b76850ab MW |
1301 | } else { |
1302 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1303 | } |
1304 | ||
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | void bond_alb_deinitialize(struct bonding *bond) | |
1309 | { | |
1310 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1311 | ||
1312 | tlb_deinitialize(bond); | |
1313 | ||
dda0fd5c | 1314 | if (bond_info->rlb_enabled) |
1da177e4 | 1315 | rlb_deinitialize(bond); |
1da177e4 LT |
1316 | } |
1317 | ||
dbdc8a21 TZ |
1318 | static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, |
1319 | struct slave *tx_slave) | |
9a49aba1 MB |
1320 | { |
1321 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1322 | struct ethhdr *eth_data = eth_hdr(skb); | |
1323 | ||
1324 | if (!tx_slave) { | |
1325 | /* unbalanced or unassigned, send through primary */ | |
1326 | tx_slave = rcu_dereference(bond->curr_active_slave); | |
e9f0fb88 MB |
1327 | if (bond->params.tlb_dynamic_lb) |
1328 | bond_info->unbalanced_load += skb->len; | |
9a49aba1 MB |
1329 | } |
1330 | ||
8557cd74 | 1331 | if (tx_slave && bond_slave_can_tx(tx_slave)) { |
b5091b55 | 1332 | if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { |
9a49aba1 MB |
1333 | ether_addr_copy(eth_data->h_source, |
1334 | tx_slave->dev->dev_addr); | |
1335 | } | |
1336 | ||
1337 | bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1338 | goto out; | |
1339 | } | |
1340 | ||
e9f0fb88 | 1341 | if (tx_slave && bond->params.tlb_dynamic_lb) { |
4bab16d7 | 1342 | spin_lock(&bond->mode_lock); |
9a49aba1 | 1343 | __tlb_clear_slave(bond, tx_slave, 0); |
4bab16d7 | 1344 | spin_unlock(&bond->mode_lock); |
9a49aba1 MB |
1345 | } |
1346 | ||
1347 | /* no suitable interface, frame not sent */ | |
31aa860e | 1348 | bond_tx_drop(bond->dev, skb); |
9a49aba1 MB |
1349 | out: |
1350 | return NETDEV_TX_OK; | |
1351 | } | |
1352 | ||
dbdc8a21 | 1353 | netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
f05b42ea MB |
1354 | { |
1355 | struct bonding *bond = netdev_priv(bond_dev); | |
1356 | struct ethhdr *eth_data; | |
1357 | struct slave *tx_slave = NULL; | |
1358 | u32 hash_index; | |
1359 | ||
1360 | skb_reset_mac_header(skb); | |
1361 | eth_data = eth_hdr(skb); | |
1362 | ||
1363 | /* Do not TX balance any multicast or broadcast */ | |
1364 | if (!is_multicast_ether_addr(eth_data->h_dest)) { | |
1365 | switch (skb->protocol) { | |
1366 | case htons(ETH_P_IP): | |
1367 | case htons(ETH_P_IPX): | |
1368 | /* In case of IPX, it will falback to L2 hash */ | |
1369 | case htons(ETH_P_IPV6): | |
1370 | hash_index = bond_xmit_hash(bond, skb); | |
e9f0fb88 MB |
1371 | if (bond->params.tlb_dynamic_lb) { |
1372 | tx_slave = tlb_choose_channel(bond, | |
1373 | hash_index & 0xFF, | |
1374 | skb->len); | |
1375 | } else { | |
ee637714 MB |
1376 | struct bond_up_slave *slaves; |
1377 | unsigned int count; | |
e9f0fb88 | 1378 | |
ee637714 | 1379 | slaves = rcu_dereference(bond->slave_arr); |
6aa7de05 | 1380 | count = slaves ? READ_ONCE(slaves->count) : 0; |
ee637714 | 1381 | if (likely(count)) |
6b794c1c | 1382 | tx_slave = slaves->arr[hash_index % |
ee637714 | 1383 | count]; |
e9f0fb88 | 1384 | } |
f05b42ea MB |
1385 | break; |
1386 | } | |
1387 | } | |
f05b42ea MB |
1388 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1389 | } | |
1390 | ||
dbdc8a21 | 1391 | netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
1da177e4 | 1392 | { |
454d7c9b | 1393 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1394 | struct ethhdr *eth_data; |
1395 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1396 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1397 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 | 1398 | int hash_size = 0; |
9a49aba1 | 1399 | bool do_tx_balance = true; |
1da177e4 | 1400 | u32 hash_index = 0; |
eddc9ec5 | 1401 | const u8 *hash_start = NULL; |
2d1ea19d | 1402 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1403 | |
459a98ed | 1404 | skb_reset_mac_header(skb); |
1da177e4 LT |
1405 | eth_data = eth_hdr(skb); |
1406 | ||
1da177e4 | 1407 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1408 | case ETH_P_IP: { |
1409 | const struct iphdr *iph = ip_hdr(skb); | |
1410 | ||
cbeeea70 DB |
1411 | if (is_broadcast_ether_addr(eth_data->h_dest) || |
1412 | iph->daddr == ip_bcast || | |
1413 | iph->protocol == IPPROTO_IGMP) { | |
9a49aba1 | 1414 | do_tx_balance = false; |
1da177e4 LT |
1415 | break; |
1416 | } | |
eddc9ec5 ACM |
1417 | hash_start = (char *)&(iph->daddr); |
1418 | hash_size = sizeof(iph->daddr); | |
1419 | } | |
1da177e4 LT |
1420 | break; |
1421 | case ETH_P_IPV6: | |
2d1ea19d VY |
1422 | /* IPv6 doesn't really use broadcast mac address, but leave |
1423 | * that here just in case. | |
1424 | */ | |
cbeeea70 | 1425 | if (is_broadcast_ether_addr(eth_data->h_dest)) { |
9a49aba1 | 1426 | do_tx_balance = false; |
1da177e4 | 1427 | break; |
2d1ea19d VY |
1428 | } |
1429 | ||
1430 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1431 | * broadcasts in IPv4. | |
1432 | */ | |
a6700db1 | 1433 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
9a49aba1 | 1434 | do_tx_balance = false; |
2d1ea19d VY |
1435 | break; |
1436 | } | |
1437 | ||
1438 | /* Additianally, DAD probes should not be tx-balanced as that | |
1439 | * will lead to false positives for duplicate addresses and | |
1440 | * prevent address configuration from working. | |
1441 | */ | |
1442 | ip6hdr = ipv6_hdr(skb); | |
1443 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
9a49aba1 | 1444 | do_tx_balance = false; |
2d1ea19d | 1445 | break; |
1da177e4 LT |
1446 | } |
1447 | ||
0660e03f ACM |
1448 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1449 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1450 | break; |
1451 | case ETH_P_IPX: | |
d3bb52b0 | 1452 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 | 1453 | /* something is wrong with this packet */ |
9a49aba1 | 1454 | do_tx_balance = false; |
1da177e4 LT |
1455 | break; |
1456 | } | |
1457 | ||
1458 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1459 | /* The only protocol worth balancing in | |
1460 | * this family since it has an "ARP" like | |
1461 | * mechanism | |
1462 | */ | |
9a49aba1 | 1463 | do_tx_balance = false; |
1da177e4 LT |
1464 | break; |
1465 | } | |
1466 | ||
b85b6fb1 | 1467 | hash_start = (char *)eth_data->h_dest; |
1da177e4 LT |
1468 | hash_size = ETH_ALEN; |
1469 | break; | |
1470 | case ETH_P_ARP: | |
9a49aba1 | 1471 | do_tx_balance = false; |
dda0fd5c | 1472 | if (bond_info->rlb_enabled) |
1da177e4 | 1473 | tx_slave = rlb_arp_xmit(skb, bond); |
1da177e4 LT |
1474 | break; |
1475 | default: | |
9a49aba1 | 1476 | do_tx_balance = false; |
1da177e4 LT |
1477 | break; |
1478 | } | |
1479 | ||
1480 | if (do_tx_balance) { | |
e79c1055 DB |
1481 | if (bond->params.tlb_dynamic_lb) { |
1482 | hash_index = _simple_hash(hash_start, hash_size); | |
1483 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1484 | } else { | |
1485 | /* | |
1486 | * do_tx_balance means we are free to select the tx_slave | |
1487 | * So we do exactly what tlb would do for hash selection | |
1488 | */ | |
1489 | ||
1490 | struct bond_up_slave *slaves; | |
1491 | unsigned int count; | |
1492 | ||
1493 | slaves = rcu_dereference(bond->slave_arr); | |
1494 | count = slaves ? READ_ONCE(slaves->count) : 0; | |
1495 | if (likely(count)) | |
1496 | tx_slave = slaves->arr[bond_xmit_hash(bond, skb) % | |
1497 | count]; | |
1498 | } | |
1da177e4 LT |
1499 | } |
1500 | ||
9a49aba1 | 1501 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1da177e4 LT |
1502 | } |
1503 | ||
1b76b316 | 1504 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1505 | { |
1b76b316 JV |
1506 | struct bonding *bond = container_of(work, struct bonding, |
1507 | alb_work.work); | |
1da177e4 | 1508 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
9caff1e7 | 1509 | struct list_head *iter; |
1da177e4 | 1510 | struct slave *slave; |
1da177e4 | 1511 | |
0965a1f3 | 1512 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1513 | bond_info->tx_rebalance_counter = 0; |
1514 | bond_info->lp_counter = 0; | |
1515 | goto re_arm; | |
1516 | } | |
1517 | ||
733ab639 | 1518 | rcu_read_lock(); |
1519 | ||
1da177e4 LT |
1520 | bond_info->tx_rebalance_counter++; |
1521 | bond_info->lp_counter++; | |
1522 | ||
1523 | /* send learning packets */ | |
7eacd038 | 1524 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
d0c21d43 VY |
1525 | bool strict_match; |
1526 | ||
d0c21d43 VY |
1527 | bond_for_each_slave_rcu(bond, slave, iter) { |
1528 | /* If updating current_active, use all currently | |
1529 | * user mac addreses (!strict_match). Otherwise, only | |
1530 | * use mac of the slave device. | |
14af9963 | 1531 | * In RLB mode, we always use strict matches. |
d0c21d43 | 1532 | */ |
4740d638 | 1533 | strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || |
14af9963 | 1534 | bond_info->rlb_enabled); |
d0c21d43 VY |
1535 | alb_send_learning_packets(slave, slave->dev->dev_addr, |
1536 | strict_match); | |
1537 | } | |
1da177e4 LT |
1538 | bond_info->lp_counter = 0; |
1539 | } | |
1540 | ||
1541 | /* rebalance tx traffic */ | |
1542 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
733ab639 | 1543 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 | 1544 | tlb_clear_slave(bond, slave, 1); |
4740d638 | 1545 | if (slave == rcu_access_pointer(bond->curr_active_slave)) { |
1da177e4 LT |
1546 | SLAVE_TLB_INFO(slave).load = |
1547 | bond_info->unbalanced_load / | |
1548 | BOND_TLB_REBALANCE_INTERVAL; | |
1549 | bond_info->unbalanced_load = 0; | |
1550 | } | |
1551 | } | |
1da177e4 LT |
1552 | bond_info->tx_rebalance_counter = 0; |
1553 | } | |
1554 | ||
1da177e4 | 1555 | if (bond_info->rlb_enabled) { |
1da177e4 LT |
1556 | if (bond_info->primary_is_promisc && |
1557 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1558 | ||
547942ca | 1559 | /* dev_set_promiscuity requires rtnl and |
1f2cd845 DM |
1560 | * nothing else. Avoid race with bond_close. |
1561 | */ | |
733ab639 | 1562 | rcu_read_unlock(); |
1563 | if (!rtnl_trylock()) | |
1f2cd845 | 1564 | goto re_arm; |
1f2cd845 | 1565 | |
1da177e4 LT |
1566 | bond_info->rlb_promisc_timeout_counter = 0; |
1567 | ||
1568 | /* If the primary was set to promiscuous mode | |
1569 | * because a slave was disabled then | |
1570 | * it can now leave promiscuous mode. | |
1571 | */ | |
4740d638 ED |
1572 | dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev, |
1573 | -1); | |
1da177e4 | 1574 | bond_info->primary_is_promisc = 0; |
1f2cd845 DM |
1575 | |
1576 | rtnl_unlock(); | |
733ab639 | 1577 | rcu_read_lock(); |
d0e81b7e | 1578 | } |
1da177e4 LT |
1579 | |
1580 | if (bond_info->rlb_rebalance) { | |
1581 | bond_info->rlb_rebalance = 0; | |
1582 | rlb_rebalance(bond); | |
1583 | } | |
1584 | ||
1585 | /* check if clients need updating */ | |
1586 | if (bond_info->rx_ntt) { | |
1587 | if (bond_info->rlb_update_delay_counter) { | |
1588 | --bond_info->rlb_update_delay_counter; | |
1589 | } else { | |
1590 | rlb_update_rx_clients(bond); | |
dda0fd5c | 1591 | if (bond_info->rlb_update_retry_counter) |
1da177e4 | 1592 | --bond_info->rlb_update_retry_counter; |
dda0fd5c | 1593 | else |
1da177e4 | 1594 | bond_info->rx_ntt = 0; |
1da177e4 LT |
1595 | } |
1596 | } | |
1597 | } | |
733ab639 | 1598 | rcu_read_unlock(); |
1da177e4 | 1599 | re_arm: |
e6d265e8 | 1600 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1601 | } |
1602 | ||
1603 | /* assumption: called before the slave is attached to the bond | |
1604 | * and not locked by the bond lock | |
1605 | */ | |
1606 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1607 | { | |
1608 | int res; | |
1609 | ||
faeeb317 JW |
1610 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, |
1611 | slave->dev->addr_len); | |
dda0fd5c | 1612 | if (res) |
1da177e4 | 1613 | return res; |
1da177e4 | 1614 | |
1da177e4 | 1615 | res = alb_handle_addr_collision_on_attach(bond, slave); |
dda0fd5c | 1616 | if (res) |
1da177e4 | 1617 | return res; |
1da177e4 LT |
1618 | |
1619 | tlb_init_slave(slave); | |
1620 | ||
1621 | /* order a rebalance ASAP */ | |
1622 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1623 | ||
dda0fd5c | 1624 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1625 | bond->alb_info.rlb_rebalance = 1; |
1da177e4 LT |
1626 | |
1627 | return 0; | |
1628 | } | |
1629 | ||
547942ca | 1630 | /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses |
2543331d JV |
1631 | * if necessary. |
1632 | * | |
1633 | * Caller must hold RTNL and no other locks | |
1634 | */ | |
1da177e4 LT |
1635 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1636 | { | |
0965a1f3 | 1637 | if (bond_has_slaves(bond)) |
1da177e4 | 1638 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1639 | |
1640 | tlb_clear_slave(bond, slave, 0); | |
1641 | ||
1642 | if (bond->alb_info.rlb_enabled) { | |
6475ae4c | 1643 | bond->alb_info.rx_slave = NULL; |
1da177e4 LT |
1644 | rlb_clear_slave(bond, slave); |
1645 | } | |
6b794c1c | 1646 | |
1da177e4 LT |
1647 | } |
1648 | ||
1da177e4 LT |
1649 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) |
1650 | { | |
1651 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1652 | ||
1653 | if (link == BOND_LINK_DOWN) { | |
1654 | tlb_clear_slave(bond, slave, 0); | |
73ac0cd4 | 1655 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1656 | rlb_clear_slave(bond, slave); |
1da177e4 LT |
1657 | } else if (link == BOND_LINK_UP) { |
1658 | /* order a rebalance ASAP */ | |
1659 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1660 | if (bond->alb_info.rlb_enabled) { | |
1661 | bond->alb_info.rlb_rebalance = 1; | |
1662 | /* If the updelay module parameter is smaller than the | |
1663 | * forwarding delay of the switch the rebalance will | |
1664 | * not work because the rebalance arp replies will | |
1665 | * not be forwarded to the clients.. | |
1666 | */ | |
1667 | } | |
1668 | } | |
6b794c1c MB |
1669 | |
1670 | if (bond_is_nondyn_tlb(bond)) { | |
ee637714 | 1671 | if (bond_update_slave_arr(bond, NULL)) |
6b794c1c MB |
1672 | pr_err("Failed to build slave-array for TLB mode.\n"); |
1673 | } | |
1da177e4 LT |
1674 | } |
1675 | ||
1676 | /** | |
1677 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1678 | * @bond: our bonding struct | |
1679 | * @new_slave: new slave to assign | |
1680 | * | |
1681 | * Set the bond->curr_active_slave to @new_slave and handle | |
1682 | * mac address swapping and promiscuity changes as needed. | |
1683 | * | |
62c5f518 | 1684 | * Caller must hold RTNL |
1da177e4 LT |
1685 | */ |
1686 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1687 | { | |
1688 | struct slave *swap_slave; | |
4740d638 | 1689 | struct slave *curr_active; |
1da177e4 | 1690 | |
62c5f518 | 1691 | curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 | 1692 | if (curr_active == new_slave) |
1da177e4 | 1693 | return; |
1da177e4 | 1694 | |
4740d638 ED |
1695 | if (curr_active && bond->alb_info.primary_is_promisc) { |
1696 | dev_set_promiscuity(curr_active->dev, -1); | |
1da177e4 LT |
1697 | bond->alb_info.primary_is_promisc = 0; |
1698 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1699 | } | |
1700 | ||
4740d638 | 1701 | swap_slave = curr_active; |
278b2083 | 1702 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1703 | |
0965a1f3 | 1704 | if (!new_slave || !bond_has_slaves(bond)) |
1da177e4 | 1705 | return; |
1da177e4 LT |
1706 | |
1707 | /* set the new curr_active_slave to the bonds mac address | |
1708 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1709 | */ | |
b88ec38d VF |
1710 | if (!swap_slave) |
1711 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1712 | |
547942ca | 1713 | /* Arrange for swap_slave and new_slave to temporarily be |
059fe7a5 JV |
1714 | * ignored so we can mess with their MAC addresses without |
1715 | * fear of interference from transmit activity. | |
1716 | */ | |
dec1e90e | 1717 | if (swap_slave) |
059fe7a5 | 1718 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1719 | tlb_clear_slave(bond, new_slave, 1); |
1720 | ||
4996b909 VF |
1721 | /* in TLB mode, the slave might flip down/up with the old dev_addr, |
1722 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1723 | */ | |
01844098 | 1724 | if (BOND_MODE(bond) == BOND_MODE_TLB) { |
faeeb317 JW |
1725 | struct sockaddr_storage ss; |
1726 | u8 tmp_addr[MAX_ADDR_LEN]; | |
4996b909 | 1727 | |
faeeb317 JW |
1728 | bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr, |
1729 | new_slave->dev->addr_len); | |
4996b909 | 1730 | |
faeeb317 JW |
1731 | bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, |
1732 | bond->dev->addr_len); | |
1733 | ss.ss_family = bond->dev->type; | |
4996b909 | 1734 | /* we don't care if it can't change its mac, best effort */ |
3a37a963 PM |
1735 | dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss, |
1736 | NULL); | |
4996b909 | 1737 | |
faeeb317 JW |
1738 | bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr, |
1739 | new_slave->dev->addr_len); | |
4996b909 VF |
1740 | } |
1741 | ||
1da177e4 LT |
1742 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1743 | if (swap_slave) { | |
1744 | /* swap mac address */ | |
43547ea6 | 1745 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 JV |
1746 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
1747 | } else { | |
b88ec38d | 1748 | /* set the new_slave to the bond mac address */ |
faeeb317 JW |
1749 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, |
1750 | bond->dev->addr_len); | |
d0c21d43 VY |
1751 | alb_send_learning_packets(new_slave, bond->dev->dev_addr, |
1752 | false); | |
1da177e4 LT |
1753 | } |
1754 | } | |
1755 | ||
ecfede42 | 1756 | /* Called with RTNL */ |
1da177e4 LT |
1757 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1758 | { | |
454d7c9b | 1759 | struct bonding *bond = netdev_priv(bond_dev); |
faeeb317 | 1760 | struct sockaddr_storage *ss = addr; |
4740d638 | 1761 | struct slave *curr_active; |
b88ec38d | 1762 | struct slave *swap_slave; |
1da177e4 | 1763 | int res; |
1da177e4 | 1764 | |
faeeb317 | 1765 | if (!is_valid_ether_addr(ss->__data)) |
1da177e4 | 1766 | return -EADDRNOTAVAIL; |
1da177e4 LT |
1767 | |
1768 | res = alb_set_mac_address(bond, addr); | |
73ac0cd4 | 1769 | if (res) |
1da177e4 | 1770 | return res; |
1da177e4 | 1771 | |
faeeb317 | 1772 | bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len); |
1da177e4 LT |
1773 | |
1774 | /* If there is no curr_active_slave there is nothing else to do. | |
1775 | * Otherwise we'll need to pass the new address to it and handle | |
1776 | * duplications. | |
1777 | */ | |
4740d638 ED |
1778 | curr_active = rtnl_dereference(bond->curr_active_slave); |
1779 | if (!curr_active) | |
1da177e4 | 1780 | return 0; |
1da177e4 | 1781 | |
b88ec38d | 1782 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1783 | |
1784 | if (swap_slave) { | |
4740d638 ED |
1785 | alb_swap_mac_addr(swap_slave, curr_active); |
1786 | alb_fasten_mac_swap(bond, swap_slave, curr_active); | |
1da177e4 | 1787 | } else { |
faeeb317 JW |
1788 | alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr, |
1789 | bond_dev->addr_len); | |
1da177e4 | 1790 | |
4740d638 | 1791 | alb_send_learning_packets(curr_active, |
d0c21d43 | 1792 | bond_dev->dev_addr, false); |
1da177e4 LT |
1793 | if (bond->alb_info.rlb_enabled) { |
1794 | /* inform clients mac address has changed */ | |
4740d638 | 1795 | rlb_req_update_slave_clients(bond, curr_active); |
1da177e4 LT |
1796 | } |
1797 | } | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1803 | { | |
73ac0cd4 | 1804 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1805 | rlb_clear_vlan(bond, vlan_id); |
1da177e4 LT |
1806 | } |
1807 |