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 LT |
42 | |
43 | ||
1da177e4 | 44 | |
f87fda00 | 45 | static const u8 mac_bcast[ETH_ALEN + 2] __long_aligned = { |
885a136c ED |
46 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
47 | }; | |
f87fda00 | 48 | static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = { |
885a136c ED |
49 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 |
50 | }; | |
1da177e4 LT |
51 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
52 | ||
53 | #pragma pack(1) | |
54 | struct learning_pkt { | |
55 | u8 mac_dst[ETH_ALEN]; | |
56 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 57 | __be16 type; |
1da177e4 LT |
58 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
59 | }; | |
60 | ||
61 | struct arp_pkt { | |
d3bb52b0 AV |
62 | __be16 hw_addr_space; |
63 | __be16 prot_addr_space; | |
1da177e4 LT |
64 | u8 hw_addr_len; |
65 | u8 prot_addr_len; | |
d3bb52b0 | 66 | __be16 op_code; |
1da177e4 | 67 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 68 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 69 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 70 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
71 | }; |
72 | #pragma pack() | |
73 | ||
a16aeb36 ACM |
74 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
75 | { | |
d56f90a7 | 76 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
77 | } |
78 | ||
1da177e4 | 79 | /* Forward declaration */ |
d0c21d43 VY |
80 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
81 | bool strict_match); | |
e53665c6 JB |
82 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
83 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
84 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
85 | u32 ip_dst_hash); | |
1da177e4 | 86 | |
eddc9ec5 | 87 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
88 | { |
89 | int i; | |
90 | u8 hash = 0; | |
91 | ||
fdb89d75 | 92 | for (i = 0; i < hash_size; i++) |
1da177e4 | 93 | hash ^= hash_start[i]; |
1da177e4 LT |
94 | |
95 | return hash; | |
96 | } | |
97 | ||
98 | /*********************** tlb specific functions ***************************/ | |
99 | ||
1da177e4 LT |
100 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) |
101 | { | |
102 | if (save_load) { | |
103 | entry->load_history = 1 + entry->tx_bytes / | |
104 | BOND_TLB_REBALANCE_INTERVAL; | |
105 | entry->tx_bytes = 0; | |
106 | } | |
107 | ||
108 | entry->tx_slave = NULL; | |
109 | entry->next = TLB_NULL_INDEX; | |
110 | entry->prev = TLB_NULL_INDEX; | |
111 | } | |
112 | ||
113 | static inline void tlb_init_slave(struct slave *slave) | |
114 | { | |
115 | SLAVE_TLB_INFO(slave).load = 0; | |
116 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
117 | } | |
118 | ||
f515e6b7 MU |
119 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, |
120 | int save_load) | |
1da177e4 LT |
121 | { |
122 | struct tlb_client_info *tx_hash_table; | |
123 | u32 index; | |
124 | ||
1da177e4 LT |
125 | /* clear slave from tx_hashtbl */ |
126 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
127 | ||
ce39a800 AG |
128 | /* skip this if we've already freed the tx hash table */ |
129 | if (tx_hash_table) { | |
130 | index = SLAVE_TLB_INFO(slave).head; | |
131 | while (index != TLB_NULL_INDEX) { | |
132 | u32 next_index = tx_hash_table[index].next; | |
133 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
134 | index = next_index; | |
135 | } | |
1da177e4 LT |
136 | } |
137 | ||
1da177e4 | 138 | tlb_init_slave(slave); |
f515e6b7 | 139 | } |
5af47b2f | 140 | |
f515e6b7 MU |
141 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, |
142 | int save_load) | |
143 | { | |
4bab16d7 | 144 | spin_lock_bh(&bond->mode_lock); |
f515e6b7 | 145 | __tlb_clear_slave(bond, slave, save_load); |
4bab16d7 | 146 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
147 | } |
148 | ||
149 | /* Must be called before starting the monitor timer */ | |
150 | static int tlb_initialize(struct bonding *bond) | |
151 | { | |
152 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
153 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 154 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
155 | int i; |
156 | ||
243cb4e5 | 157 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 158 | if (!new_hashtbl) |
6d9b6f42 | 159 | return -ENOMEM; |
e404decb | 160 | |
4bab16d7 | 161 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
162 | |
163 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 164 | |
fdb89d75 | 165 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) |
38dbaf0a | 166 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 | 167 | |
4bab16d7 | 168 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
169 | |
170 | return 0; | |
171 | } | |
172 | ||
173 | /* Must be called only after all slaves have been released */ | |
174 | static void tlb_deinitialize(struct bonding *bond) | |
175 | { | |
176 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
177 | ||
4bab16d7 | 178 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
179 | |
180 | kfree(bond_info->tx_hashtbl); | |
181 | bond_info->tx_hashtbl = NULL; | |
182 | ||
4bab16d7 | 183 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
184 | } |
185 | ||
097811bb JP |
186 | static long long compute_gap(struct slave *slave) |
187 | { | |
188 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
189 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
190 | } | |
191 | ||
1da177e4 LT |
192 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) |
193 | { | |
194 | struct slave *slave, *least_loaded; | |
9caff1e7 | 195 | struct list_head *iter; |
097811bb | 196 | long long max_gap; |
1da177e4 | 197 | |
097811bb JP |
198 | least_loaded = NULL; |
199 | max_gap = LLONG_MIN; | |
1da177e4 LT |
200 | |
201 | /* Find the slave with the largest gap */ | |
28c71926 | 202 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 203 | if (bond_slave_can_tx(slave)) { |
097811bb JP |
204 | long long gap = compute_gap(slave); |
205 | ||
1da177e4 LT |
206 | if (max_gap < gap) { |
207 | least_loaded = slave; | |
208 | max_gap = gap; | |
209 | } | |
210 | } | |
211 | } | |
212 | ||
213 | return least_loaded; | |
214 | } | |
215 | ||
f515e6b7 MU |
216 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
217 | u32 skb_len) | |
1da177e4 LT |
218 | { |
219 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
220 | struct tlb_client_info *hash_table; | |
221 | struct slave *assigned_slave; | |
222 | ||
1da177e4 LT |
223 | hash_table = bond_info->tx_hashtbl; |
224 | assigned_slave = hash_table[hash_index].tx_slave; | |
225 | if (!assigned_slave) { | |
226 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
227 | ||
228 | if (assigned_slave) { | |
229 | struct tlb_slave_info *slave_info = | |
230 | &(SLAVE_TLB_INFO(assigned_slave)); | |
231 | u32 next_index = slave_info->head; | |
232 | ||
233 | hash_table[hash_index].tx_slave = assigned_slave; | |
234 | hash_table[hash_index].next = next_index; | |
235 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
236 | ||
fdb89d75 | 237 | if (next_index != TLB_NULL_INDEX) |
1da177e4 | 238 | hash_table[next_index].prev = hash_index; |
1da177e4 LT |
239 | |
240 | slave_info->head = hash_index; | |
241 | slave_info->load += | |
242 | hash_table[hash_index].load_history; | |
243 | } | |
244 | } | |
245 | ||
fdb89d75 | 246 | if (assigned_slave) |
1da177e4 | 247 | hash_table[hash_index].tx_bytes += skb_len; |
1da177e4 | 248 | |
1da177e4 LT |
249 | return assigned_slave; |
250 | } | |
251 | ||
f515e6b7 MU |
252 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, |
253 | u32 skb_len) | |
254 | { | |
255 | struct slave *tx_slave; | |
547942ca NA |
256 | |
257 | /* We don't need to disable softirq here, becase | |
f515e6b7 MU |
258 | * tlb_choose_channel() is only called by bond_alb_xmit() |
259 | * which already has softirq disabled. | |
260 | */ | |
4bab16d7 | 261 | spin_lock(&bond->mode_lock); |
f515e6b7 | 262 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); |
4bab16d7 | 263 | spin_unlock(&bond->mode_lock); |
547942ca | 264 | |
f515e6b7 MU |
265 | return tx_slave; |
266 | } | |
267 | ||
1da177e4 | 268 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 269 | |
1da177e4 LT |
270 | /* when an ARP REPLY is received from a client update its info |
271 | * in the rx_hashtbl | |
272 | */ | |
273 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
274 | { | |
275 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
276 | struct rlb_client_info *client_info; | |
277 | u32 hash_index; | |
278 | ||
4bab16d7 | 279 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 280 | |
b85b6fb1 | 281 | hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
1da177e4 LT |
282 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
283 | ||
284 | if ((client_info->assigned) && | |
285 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 286 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 287 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 | 288 | /* update the clients MAC address */ |
ada0f863 | 289 | ether_addr_copy(client_info->mac_dst, arp->mac_src); |
1da177e4 LT |
290 | client_info->ntt = 1; |
291 | bond_info->rx_ntt = 1; | |
292 | } | |
293 | ||
4bab16d7 | 294 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
295 | } |
296 | ||
de063b70 ED |
297 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
298 | struct slave *slave) | |
1da177e4 | 299 | { |
de063b70 | 300 | struct arp_pkt *arp, _arp; |
1da177e4 | 301 | |
3aba891d | 302 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 303 | goto out; |
1da177e4 | 304 | |
de063b70 ED |
305 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
306 | if (!arp) | |
b99215cd | 307 | goto out; |
1da177e4 | 308 | |
e53665c6 JB |
309 | /* We received an ARP from arp->ip_src. |
310 | * We might have used this IP address previously (on the bonding host | |
311 | * itself or on a system that is bridged together with the bond). | |
312 | * However, if arp->mac_src is different than what is stored in | |
313 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
314 | * sending out client updates with this IP address and the old MAC | |
315 | * address. | |
316 | * Clean up all hash table entries that have this address as ip_src but | |
317 | * have a different mac_src. | |
318 | */ | |
319 | rlb_purge_src_ip(bond, arp); | |
320 | ||
1da177e4 LT |
321 | if (arp->op_code == htons(ARPOP_REPLY)) { |
322 | /* update rx hash table for this ARP */ | |
323 | rlb_update_entry_from_arp(bond, arp); | |
0a111a03 | 324 | netdev_dbg(bond->dev, "Server received an ARP Reply from client\n"); |
1da177e4 | 325 | } |
b99215cd DM |
326 | out: |
327 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
328 | } |
329 | ||
56924c38 NA |
330 | /* Caller must hold rcu_read_lock() */ |
331 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
1da177e4 LT |
332 | { |
333 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6475ae4c VF |
334 | struct slave *before = NULL, *rx_slave = NULL, *slave; |
335 | struct list_head *iter; | |
336 | bool found = false; | |
1da177e4 | 337 | |
56924c38 | 338 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 339 | if (!bond_slave_can_tx(slave)) |
6475ae4c VF |
340 | continue; |
341 | if (!found) { | |
342 | if (!before || before->speed < slave->speed) | |
343 | before = slave; | |
344 | } else { | |
345 | if (!rx_slave || rx_slave->speed < slave->speed) | |
1da177e4 | 346 | rx_slave = slave; |
1da177e4 | 347 | } |
6475ae4c VF |
348 | if (slave == bond_info->rx_slave) |
349 | found = true; | |
1da177e4 | 350 | } |
6475ae4c VF |
351 | /* we didn't find anything after the current or we have something |
352 | * better before and up to the current slave | |
353 | */ | |
354 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
355 | rx_slave = before; | |
1da177e4 | 356 | |
6475ae4c VF |
357 | if (rx_slave) |
358 | bond_info->rx_slave = rx_slave; | |
1da177e4 LT |
359 | |
360 | return rx_slave; | |
361 | } | |
362 | ||
56924c38 NA |
363 | /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */ |
364 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
28c71926 | 365 | { |
56924c38 | 366 | struct slave *rx_slave; |
28c71926 | 367 | |
56924c38 | 368 | ASSERT_RTNL(); |
28c71926 | 369 | |
56924c38 NA |
370 | rcu_read_lock(); |
371 | rx_slave = __rlb_next_rx_slave(bond); | |
372 | rcu_read_unlock(); | |
28c71926 | 373 | |
374 | return rx_slave; | |
375 | } | |
376 | ||
1da177e4 LT |
377 | /* teach the switch the mac of a disabled slave |
378 | * on the primary for fault tolerance | |
379 | * | |
62c5f518 | 380 | * Caller must hold RTNL |
1da177e4 LT |
381 | */ |
382 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
383 | { | |
1c72cfdc | 384 | struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 ED |
385 | |
386 | if (!curr_active) | |
1da177e4 | 387 | return; |
1da177e4 LT |
388 | |
389 | if (!bond->alb_info.primary_is_promisc) { | |
4740d638 | 390 | if (!dev_set_promiscuity(curr_active->dev, 1)) |
7e1a1ac1 WC |
391 | bond->alb_info.primary_is_promisc = 1; |
392 | else | |
393 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
394 | } |
395 | ||
396 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
397 | ||
4740d638 | 398 | alb_send_learning_packets(curr_active, addr, true); |
1da177e4 LT |
399 | } |
400 | ||
401 | /* slave being removed should not be active at this point | |
402 | * | |
b2e7aceb | 403 | * Caller must hold rtnl. |
1da177e4 LT |
404 | */ |
405 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
406 | { | |
407 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
408 | struct rlb_client_info *rx_hash_table; | |
409 | u32 index, next_index; | |
410 | ||
411 | /* clear slave from rx_hashtbl */ | |
4bab16d7 | 412 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
413 | |
414 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 415 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 416 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 417 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
418 | if (rx_hash_table[index].slave == slave) { |
419 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
420 | ||
421 | if (assigned_slave) { | |
422 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
423 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
424 | mac_bcast)) { | |
1da177e4 LT |
425 | bond_info->rx_hashtbl[index].ntt = 1; |
426 | bond_info->rx_ntt = 1; | |
427 | /* A slave has been removed from the | |
428 | * table because it is either disabled | |
429 | * or being released. We must retry the | |
430 | * update to avoid clients from not | |
431 | * being updated & disconnecting when | |
432 | * there is stress | |
433 | */ | |
434 | bond_info->rlb_update_retry_counter = | |
435 | RLB_UPDATE_RETRY; | |
436 | } | |
437 | } else { /* there is no active slave */ | |
438 | rx_hash_table[index].slave = NULL; | |
439 | } | |
440 | } | |
441 | } | |
442 | ||
4bab16d7 | 443 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 444 | |
1c72cfdc | 445 | if (slave != rtnl_dereference(bond->curr_active_slave)) |
1da177e4 | 446 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); |
1da177e4 LT |
447 | } |
448 | ||
449 | static void rlb_update_client(struct rlb_client_info *client_info) | |
450 | { | |
451 | int i; | |
452 | ||
35d75ee4 | 453 | if (!client_info->slave) |
1da177e4 | 454 | return; |
1da177e4 LT |
455 | |
456 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
457 | struct sk_buff *skb; | |
458 | ||
459 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
460 | client_info->ip_dst, | |
461 | client_info->slave->dev, | |
462 | client_info->ip_src, | |
463 | client_info->mac_dst, | |
464 | client_info->slave->dev->dev_addr, | |
465 | client_info->mac_dst); | |
466 | if (!skb) { | |
0a111a03 VF |
467 | netdev_err(client_info->slave->bond->dev, |
468 | "failed to create an ARP packet\n"); | |
1da177e4 LT |
469 | continue; |
470 | } | |
471 | ||
472 | skb->dev = client_info->slave->dev; | |
473 | ||
d3ab3ffd | 474 | if (client_info->vlan_id) { |
b4bef1b5 JP |
475 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), |
476 | client_info->vlan_id); | |
1da177e4 LT |
477 | } |
478 | ||
479 | arp_xmit(skb); | |
480 | } | |
481 | } | |
482 | ||
483 | /* sends ARP REPLIES that update the clients that need updating */ | |
484 | static void rlb_update_rx_clients(struct bonding *bond) | |
485 | { | |
486 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
487 | struct rlb_client_info *client_info; | |
488 | u32 hash_index; | |
489 | ||
4bab16d7 | 490 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 491 | |
e53665c6 JB |
492 | hash_index = bond_info->rx_hashtbl_used_head; |
493 | for (; hash_index != RLB_NULL_INDEX; | |
494 | hash_index = client_info->used_next) { | |
1da177e4 LT |
495 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
496 | if (client_info->ntt) { | |
497 | rlb_update_client(client_info); | |
35d75ee4 | 498 | if (bond_info->rlb_update_retry_counter == 0) |
1da177e4 | 499 | client_info->ntt = 0; |
1da177e4 LT |
500 | } |
501 | } | |
502 | ||
94e2bd68 | 503 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
504 | * not to confuse the clients. |
505 | */ | |
506 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
507 | ||
4bab16d7 | 508 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
509 | } |
510 | ||
511 | /* The slave was assigned a new mac address - update the clients */ | |
512 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
513 | { | |
514 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
515 | struct rlb_client_info *client_info; | |
516 | int ntt = 0; | |
517 | u32 hash_index; | |
518 | ||
4bab16d7 | 519 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 520 | |
e53665c6 JB |
521 | hash_index = bond_info->rx_hashtbl_used_head; |
522 | for (; hash_index != RLB_NULL_INDEX; | |
523 | hash_index = client_info->used_next) { | |
1da177e4 LT |
524 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
525 | ||
526 | if ((client_info->slave == slave) && | |
a6700db1 | 527 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
528 | client_info->ntt = 1; |
529 | ntt = 1; | |
530 | } | |
531 | } | |
532 | ||
4708a1b1 | 533 | /* update the team's flag only after the whole iteration */ |
1da177e4 LT |
534 | if (ntt) { |
535 | bond_info->rx_ntt = 1; | |
4708a1b1 | 536 | /* fasten the change */ |
1da177e4 LT |
537 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
538 | } | |
539 | ||
4bab16d7 | 540 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
541 | } |
542 | ||
543 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 544 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
545 | { |
546 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
547 | struct rlb_client_info *client_info; | |
548 | u32 hash_index; | |
549 | ||
4bab16d7 | 550 | spin_lock(&bond->mode_lock); |
1da177e4 | 551 | |
e53665c6 JB |
552 | hash_index = bond_info->rx_hashtbl_used_head; |
553 | for (; hash_index != RLB_NULL_INDEX; | |
554 | hash_index = client_info->used_next) { | |
1da177e4 LT |
555 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
556 | ||
557 | if (!client_info->slave) { | |
0a111a03 | 558 | netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); |
1da177e4 LT |
559 | continue; |
560 | } | |
547942ca | 561 | /* update all clients using this src_ip, that are not assigned |
1da177e4 LT |
562 | * to the team's address (curr_active_slave) and have a known |
563 | * unicast mac address. | |
564 | */ | |
565 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
566 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
567 | bond->dev->dev_addr) && | |
568 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
569 | client_info->ntt = 1; |
570 | bond_info->rx_ntt = 1; | |
571 | } | |
572 | } | |
573 | ||
4bab16d7 | 574 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
575 | } |
576 | ||
1da177e4 LT |
577 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) |
578 | { | |
579 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 580 | struct arp_pkt *arp = arp_pkt(skb); |
28c71926 | 581 | struct slave *assigned_slave, *curr_active_slave; |
1da177e4 LT |
582 | struct rlb_client_info *client_info; |
583 | u32 hash_index = 0; | |
584 | ||
4bab16d7 | 585 | spin_lock(&bond->mode_lock); |
1da177e4 | 586 | |
28c71926 | 587 | curr_active_slave = rcu_dereference(bond->curr_active_slave); |
588 | ||
e364a341 | 589 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
590 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
591 | ||
592 | if (client_info->assigned) { | |
593 | if ((client_info->ip_src == arp->ip_src) && | |
594 | (client_info->ip_dst == arp->ip_dst)) { | |
595 | /* the entry is already assigned to this client */ | |
a6700db1 | 596 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 | 597 | /* update mac address from arp */ |
ada0f863 | 598 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
1da177e4 | 599 | } |
ada0f863 | 600 | ether_addr_copy(client_info->mac_src, arp->mac_src); |
1da177e4 LT |
601 | |
602 | assigned_slave = client_info->slave; | |
603 | if (assigned_slave) { | |
4bab16d7 | 604 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
605 | return assigned_slave; |
606 | } | |
607 | } else { | |
608 | /* the entry is already assigned to some other client, | |
609 | * move the old client to primary (curr_active_slave) so | |
610 | * that the new client can be assigned to this entry. | |
611 | */ | |
4740d638 | 612 | if (curr_active_slave && |
28c71926 | 613 | client_info->slave != curr_active_slave) { |
614 | client_info->slave = curr_active_slave; | |
1da177e4 LT |
615 | rlb_update_client(client_info); |
616 | } | |
617 | } | |
618 | } | |
619 | /* assign a new slave */ | |
28c71926 | 620 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
621 | |
622 | if (assigned_slave) { | |
e53665c6 JB |
623 | if (!(client_info->assigned && |
624 | client_info->ip_src == arp->ip_src)) { | |
625 | /* ip_src is going to be updated, | |
626 | * fix the src hash list | |
627 | */ | |
628 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
629 | sizeof(arp->ip_src)); | |
630 | rlb_src_unlink(bond, hash_index); | |
631 | rlb_src_link(bond, hash_src, hash_index); | |
632 | } | |
633 | ||
1da177e4 LT |
634 | client_info->ip_src = arp->ip_src; |
635 | client_info->ip_dst = arp->ip_dst; | |
636 | /* arp->mac_dst is broadcast for arp reqeusts. | |
637 | * will be updated with clients actual unicast mac address | |
638 | * upon receiving an arp reply. | |
639 | */ | |
ada0f863 JP |
640 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
641 | ether_addr_copy(client_info->mac_src, arp->mac_src); | |
1da177e4 LT |
642 | client_info->slave = assigned_slave; |
643 | ||
a6700db1 | 644 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
645 | client_info->ntt = 1; |
646 | bond->alb_info.rx_ntt = 1; | |
647 | } else { | |
648 | client_info->ntt = 0; | |
649 | } | |
650 | ||
fb00bc2e | 651 | if (vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 652 | client_info->vlan_id = 0; |
1da177e4 LT |
653 | |
654 | if (!client_info->assigned) { | |
e53665c6 JB |
655 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
656 | bond_info->rx_hashtbl_used_head = hash_index; | |
657 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 658 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 659 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
660 | hash_index; |
661 | } | |
662 | client_info->assigned = 1; | |
663 | } | |
664 | } | |
665 | ||
4bab16d7 | 666 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
667 | |
668 | return assigned_slave; | |
669 | } | |
670 | ||
671 | /* chooses (and returns) transmit channel for arp reply | |
672 | * does not choose channel for other arp types since they are | |
673 | * sent on the curr_active_slave | |
674 | */ | |
675 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
676 | { | |
a16aeb36 | 677 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
678 | struct slave *tx_slave = NULL; |
679 | ||
567b871e | 680 | /* Don't modify or load balance ARPs that do not originate locally |
681 | * (e.g.,arrive via a bridge). | |
682 | */ | |
14af9963 | 683 | if (!bond_slave_has_mac_rx(bond, arp->mac_src)) |
567b871e | 684 | return NULL; |
685 | ||
f14c4e4e | 686 | if (arp->op_code == htons(ARPOP_REPLY)) { |
547942ca | 687 | /* the arp must be sent on the selected rx channel */ |
1da177e4 | 688 | tx_slave = rlb_choose_channel(skb, bond); |
35d75ee4 | 689 | if (tx_slave) |
faeeb317 JW |
690 | bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr, |
691 | tx_slave->dev->addr_len); | |
0a111a03 | 692 | netdev_dbg(bond->dev, "Server sent ARP Reply packet\n"); |
f14c4e4e | 693 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
694 | /* Create an entry in the rx_hashtbl for this client as a |
695 | * place holder. | |
696 | * When the arp reply is received the entry will be updated | |
697 | * with the correct unicast address of the client. | |
698 | */ | |
699 | rlb_choose_channel(skb, bond); | |
700 | ||
77c8e2c0 | 701 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
702 | * they can cancel out the influence of the ARP request. |
703 | */ | |
704 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
705 | ||
706 | /* arp requests are broadcast and are sent on the primary | |
707 | * the arp request will collapse all clients on the subnet to | |
708 | * the primary slave. We must register these clients to be | |
709 | * updated with their assigned mac. | |
710 | */ | |
711 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
0a111a03 | 712 | netdev_dbg(bond->dev, "Server sent ARP Request packet\n"); |
1da177e4 LT |
713 | } |
714 | ||
715 | return tx_slave; | |
716 | } | |
717 | ||
1da177e4 LT |
718 | static void rlb_rebalance(struct bonding *bond) |
719 | { | |
720 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
721 | struct slave *assigned_slave; | |
722 | struct rlb_client_info *client_info; | |
723 | int ntt; | |
724 | u32 hash_index; | |
725 | ||
4bab16d7 | 726 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
727 | |
728 | ntt = 0; | |
e53665c6 JB |
729 | hash_index = bond_info->rx_hashtbl_used_head; |
730 | for (; hash_index != RLB_NULL_INDEX; | |
731 | hash_index = client_info->used_next) { | |
1da177e4 | 732 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
733ab639 | 733 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
734 | if (assigned_slave && (client_info->slave != assigned_slave)) { |
735 | client_info->slave = assigned_slave; | |
736 | client_info->ntt = 1; | |
737 | ntt = 1; | |
738 | } | |
739 | } | |
740 | ||
741 | /* update the team's flag only after the whole iteration */ | |
35d75ee4 | 742 | if (ntt) |
1da177e4 | 743 | bond_info->rx_ntt = 1; |
4bab16d7 | 744 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
745 | } |
746 | ||
547942ca | 747 | /* Caller must hold mode_lock */ |
e53665c6 JB |
748 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
749 | { | |
750 | entry->used_next = RLB_NULL_INDEX; | |
751 | entry->used_prev = RLB_NULL_INDEX; | |
752 | entry->assigned = 0; | |
753 | entry->slave = NULL; | |
d3ab3ffd | 754 | entry->vlan_id = 0; |
e53665c6 JB |
755 | } |
756 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
757 | { | |
758 | entry->src_first = RLB_NULL_INDEX; | |
759 | entry->src_prev = RLB_NULL_INDEX; | |
760 | entry->src_next = RLB_NULL_INDEX; | |
761 | } | |
762 | ||
1da177e4 LT |
763 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
764 | { | |
765 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
766 | rlb_init_table_entry_dst(entry); |
767 | rlb_init_table_entry_src(entry); | |
768 | } | |
769 | ||
770 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
771 | { | |
772 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
773 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
774 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
775 | ||
776 | if (index == bond_info->rx_hashtbl_used_head) | |
777 | bond_info->rx_hashtbl_used_head = next_index; | |
778 | if (prev_index != RLB_NULL_INDEX) | |
779 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
780 | if (next_index != RLB_NULL_INDEX) | |
781 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
782 | } | |
783 | ||
784 | /* unlink a rlb hash table entry from the src list */ | |
785 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
786 | { | |
787 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
788 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
789 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
790 | ||
791 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
792 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
793 | ||
794 | if (next_index != RLB_NULL_INDEX) | |
795 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
796 | ||
797 | if (prev_index == RLB_NULL_INDEX) | |
798 | return; | |
799 | ||
800 | /* is prev_index pointing to the head of this list? */ | |
801 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
802 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
803 | else | |
804 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
805 | ||
806 | } | |
807 | ||
808 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
809 | { | |
810 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
811 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
812 | ||
813 | rlb_delete_table_entry_dst(bond, index); | |
814 | rlb_init_table_entry_dst(entry); | |
815 | ||
816 | rlb_src_unlink(bond, index); | |
817 | } | |
818 | ||
819 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
820 | * of entries with identical ip_src_hash | |
821 | */ | |
822 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
823 | { | |
824 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
825 | u32 next; | |
826 | ||
827 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
828 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
829 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
830 | if (next != RLB_NULL_INDEX) | |
831 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
832 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
833 | } | |
834 | ||
547942ca NA |
835 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does |
836 | * not match arp->mac_src | |
837 | */ | |
e53665c6 JB |
838 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) |
839 | { | |
840 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
b85b6fb1 | 841 | u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
e53665c6 JB |
842 | u32 index; |
843 | ||
4bab16d7 | 844 | spin_lock_bh(&bond->mode_lock); |
e53665c6 JB |
845 | |
846 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
847 | while (index != RLB_NULL_INDEX) { | |
848 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
849 | u32 next_index = entry->src_next; | |
850 | if (entry->ip_src == arp->ip_src && | |
851 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
852 | rlb_delete_table_entry(bond, index); | |
853 | index = next_index; | |
854 | } | |
4bab16d7 | 855 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
856 | } |
857 | ||
858 | static int rlb_initialize(struct bonding *bond) | |
859 | { | |
860 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 861 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
862 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
863 | int i; | |
864 | ||
0d206a3a | 865 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 866 | if (!new_hashtbl) |
1da177e4 | 867 | return -1; |
e404decb | 868 | |
4bab16d7 | 869 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
870 | |
871 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 872 | |
e53665c6 | 873 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 874 | |
35d75ee4 | 875 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) |
1da177e4 | 876 | rlb_init_table_entry(bond_info->rx_hashtbl + i); |
1da177e4 | 877 | |
4bab16d7 | 878 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 879 | |
1da177e4 | 880 | /* register to receive ARPs */ |
3aba891d | 881 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
882 | |
883 | return 0; | |
884 | } | |
885 | ||
886 | static void rlb_deinitialize(struct bonding *bond) | |
887 | { | |
888 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
889 | ||
4bab16d7 | 890 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
891 | |
892 | kfree(bond_info->rx_hashtbl); | |
893 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 894 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 895 | |
4bab16d7 | 896 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
897 | } |
898 | ||
899 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
900 | { | |
901 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
902 | u32 curr_index; | |
903 | ||
4bab16d7 | 904 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 905 | |
e53665c6 | 906 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
907 | while (curr_index != RLB_NULL_INDEX) { |
908 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 909 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 910 | |
d3ab3ffd | 911 | if (curr->vlan_id == vlan_id) |
e53665c6 | 912 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
913 | |
914 | curr_index = next_index; | |
915 | } | |
916 | ||
4bab16d7 | 917 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
918 | } |
919 | ||
920 | /*********************** tlb/rlb shared functions *********************/ | |
921 | ||
7aa64981 | 922 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
d6b694c0 | 923 | __be16 vlan_proto, u16 vid) |
1da177e4 | 924 | { |
1da177e4 | 925 | struct learning_pkt pkt; |
7aa64981 | 926 | struct sk_buff *skb; |
1da177e4 | 927 | int size = sizeof(struct learning_pkt); |
7aa64981 | 928 | char *data; |
1da177e4 LT |
929 | |
930 | memset(&pkt, 0, size); | |
ada0f863 JP |
931 | ether_addr_copy(pkt.mac_dst, mac_addr); |
932 | ether_addr_copy(pkt.mac_src, mac_addr); | |
96a0922c | 933 | pkt.type = cpu_to_be16(ETH_P_LOOPBACK); |
1da177e4 | 934 | |
7aa64981 VF |
935 | skb = dev_alloc_skb(size); |
936 | if (!skb) | |
937 | return; | |
1da177e4 | 938 | |
59ae1d12 | 939 | data = skb_put_data(skb, &pkt, size); |
7aa64981 VF |
940 | |
941 | skb_reset_mac_header(skb); | |
942 | skb->network_header = skb->mac_header + ETH_HLEN; | |
943 | skb->protocol = pkt.type; | |
944 | skb->priority = TC_PRIO_CONTROL; | |
945 | skb->dev = slave->dev; | |
946 | ||
b4bef1b5 JP |
947 | if (vid) |
948 | __vlan_hwaccel_put_tag(skb, vlan_proto, vid); | |
7aa64981 VF |
949 | |
950 | dev_queue_xmit(skb); | |
951 | } | |
1da177e4 | 952 | |
b3208b20 DA |
953 | struct alb_walk_data { |
954 | struct bonding *bond; | |
955 | struct slave *slave; | |
956 | u8 *mac_addr; | |
957 | bool strict_match; | |
958 | }; | |
959 | ||
960 | static int alb_upper_dev_walk(struct net_device *upper, void *_data) | |
961 | { | |
962 | struct alb_walk_data *data = _data; | |
963 | bool strict_match = data->strict_match; | |
964 | struct bonding *bond = data->bond; | |
965 | struct slave *slave = data->slave; | |
966 | u8 *mac_addr = data->mac_addr; | |
967 | struct bond_vlan_tag *tags; | |
968 | ||
969 | if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) { | |
970 | if (strict_match && | |
971 | ether_addr_equal_64bits(mac_addr, | |
972 | upper->dev_addr)) { | |
973 | alb_send_lp_vid(slave, mac_addr, | |
974 | vlan_dev_vlan_proto(upper), | |
975 | vlan_dev_vlan_id(upper)); | |
976 | } else if (!strict_match) { | |
977 | alb_send_lp_vid(slave, upper->dev_addr, | |
978 | vlan_dev_vlan_proto(upper), | |
979 | vlan_dev_vlan_id(upper)); | |
980 | } | |
981 | } | |
982 | ||
983 | /* If this is a macvlan device, then only send updates | |
984 | * when strict_match is turned off. | |
985 | */ | |
986 | if (netif_is_macvlan(upper) && !strict_match) { | |
987 | tags = bond_verify_device_path(bond->dev, upper, 0); | |
988 | if (IS_ERR_OR_NULL(tags)) | |
989 | BUG(); | |
990 | alb_send_lp_vid(slave, upper->dev_addr, | |
991 | tags[0].vlan_proto, tags[0].vlan_id); | |
992 | kfree(tags); | |
993 | } | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
d0c21d43 VY |
998 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
999 | bool strict_match) | |
7aa64981 VF |
1000 | { |
1001 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
b3208b20 DA |
1002 | struct alb_walk_data data = { |
1003 | .strict_match = strict_match, | |
1004 | .mac_addr = mac_addr, | |
1005 | .slave = slave, | |
1006 | .bond = bond, | |
1007 | }; | |
5bf94b83 VF |
1008 | |
1009 | /* send untagged */ | |
d6b694c0 | 1010 | alb_send_lp_vid(slave, mac_addr, 0, 0); |
5bf94b83 | 1011 | |
14af9963 VY |
1012 | /* loop through all devices and see if we need to send a packet |
1013 | * for that device. | |
1014 | */ | |
5bf94b83 | 1015 | rcu_read_lock(); |
b3208b20 | 1016 | netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data); |
5bf94b83 | 1017 | rcu_read_unlock(); |
1da177e4 LT |
1018 | } |
1019 | ||
faeeb317 JW |
1020 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], |
1021 | unsigned int len) | |
1da177e4 LT |
1022 | { |
1023 | struct net_device *dev = slave->dev; | |
faeeb317 | 1024 | struct sockaddr_storage ss; |
1da177e4 | 1025 | |
01844098 | 1026 | if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { |
faeeb317 | 1027 | memcpy(dev->dev_addr, addr, len); |
1da177e4 LT |
1028 | return 0; |
1029 | } | |
1030 | ||
547942ca NA |
1031 | /* for rlb each slave must have a unique hw mac addresses so that |
1032 | * each slave will receive packets destined to a different mac | |
1033 | */ | |
faeeb317 JW |
1034 | memcpy(ss.__data, addr, len); |
1035 | ss.ss_family = dev->type; | |
1036 | if (dev_set_mac_address(dev, (struct sockaddr *)&ss)) { | |
0a111a03 VF |
1037 | 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", |
1038 | dev->name); | |
1da177e4 LT |
1039 | return -EOPNOTSUPP; |
1040 | } | |
1041 | return 0; | |
1042 | } | |
1043 | ||
547942ca | 1044 | /* Swap MAC addresses between two slaves. |
059fe7a5 JV |
1045 | * |
1046 | * Called with RTNL held, and no other locks. | |
059fe7a5 | 1047 | */ |
43547ea6 | 1048 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1049 | { |
faeeb317 | 1050 | u8 tmp_mac_addr[MAX_ADDR_LEN]; |
1da177e4 | 1051 | |
faeeb317 JW |
1052 | bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr, |
1053 | slave1->dev->addr_len); | |
1054 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, | |
1055 | slave2->dev->addr_len); | |
1056 | alb_set_slave_mac_addr(slave2, tmp_mac_addr, | |
1057 | slave1->dev->addr_len); | |
1da177e4 | 1058 | |
059fe7a5 JV |
1059 | } |
1060 | ||
547942ca | 1061 | /* Send learning packets after MAC address swap. |
059fe7a5 | 1062 | * |
2543331d | 1063 | * Called with RTNL and no other locks |
059fe7a5 JV |
1064 | */ |
1065 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1066 | struct slave *slave2) | |
1067 | { | |
8557cd74 | 1068 | int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); |
059fe7a5 JV |
1069 | struct slave *disabled_slave = NULL; |
1070 | ||
2543331d JV |
1071 | ASSERT_RTNL(); |
1072 | ||
1da177e4 | 1073 | /* fasten the change in the switch */ |
8557cd74 | 1074 | if (bond_slave_can_tx(slave1)) { |
d0c21d43 | 1075 | alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); |
1da177e4 LT |
1076 | if (bond->alb_info.rlb_enabled) { |
1077 | /* inform the clients that the mac address | |
1078 | * has changed | |
1079 | */ | |
1080 | rlb_req_update_slave_clients(bond, slave1); | |
1081 | } | |
1082 | } else { | |
1083 | disabled_slave = slave1; | |
1084 | } | |
1085 | ||
8557cd74 | 1086 | if (bond_slave_can_tx(slave2)) { |
d0c21d43 | 1087 | alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); |
1da177e4 LT |
1088 | if (bond->alb_info.rlb_enabled) { |
1089 | /* inform the clients that the mac address | |
1090 | * has changed | |
1091 | */ | |
1092 | rlb_req_update_slave_clients(bond, slave2); | |
1093 | } | |
1094 | } else { | |
1095 | disabled_slave = slave2; | |
1096 | } | |
1097 | ||
1098 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1099 | /* A disabled slave was assigned an active mac addr */ | |
1100 | rlb_teach_disabled_mac_on_primary(bond, | |
1101 | disabled_slave->dev->dev_addr); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * alb_change_hw_addr_on_detach | |
1107 | * @bond: bonding we're working on | |
1108 | * @slave: the slave that was just detached | |
1109 | * | |
1110 | * We assume that @slave was already detached from the slave list. | |
1111 | * | |
1112 | * If @slave's permanent hw address is different both from its current | |
1113 | * address and from @bond's address, then somewhere in the bond there's | |
1114 | * a slave that has @slave's permanet address as its current address. | |
1115 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1116 | * | |
2543331d | 1117 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1118 | */ |
1119 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1120 | { | |
1121 | int perm_curr_diff; | |
1122 | int perm_bond_diff; | |
b88ec38d | 1123 | struct slave *found_slave; |
1da177e4 | 1124 | |
a6700db1 JP |
1125 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1126 | slave->dev->dev_addr); | |
1127 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1128 | bond->dev->dev_addr); | |
1da177e4 LT |
1129 | |
1130 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1131 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1132 | |
b88ec38d | 1133 | if (found_slave) { |
b88ec38d VF |
1134 | alb_swap_mac_addr(slave, found_slave); |
1135 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1136 | } |
1137 | } | |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * alb_handle_addr_collision_on_attach | |
1142 | * @bond: bonding we're working on | |
1143 | * @slave: the slave that was just attached | |
1144 | * | |
1145 | * checks uniqueness of slave's mac address and handles the case the | |
1146 | * new slave uses the bonds mac address. | |
1147 | * | |
1148 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1149 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1150 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1151 | * addresses of the other slaves. |
1152 | * | |
1153 | * We go over the slave list, and for each slave there we compare its | |
1154 | * permanent hw address with the current address of all the other slaves. | |
1155 | * If no match was found, then we've found a slave with a permanent address | |
1156 | * that isn't used by any other slave in the bond, so we can assign it to | |
1157 | * @slave. | |
1158 | * | |
1159 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1160 | * bond slave list. |
1da177e4 LT |
1161 | */ |
1162 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1163 | { | |
4740d638 | 1164 | struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); |
9caff1e7 VF |
1165 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1166 | struct list_head *iter; | |
1da177e4 | 1167 | |
0965a1f3 | 1168 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1169 | /* this is the first slave */ |
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | /* if slave's mac address differs from bond's mac address | |
1174 | * check uniqueness of slave's mac address against the other | |
1175 | * slaves in the bond. | |
1176 | */ | |
a6700db1 | 1177 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1178 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1179 | return 0; |
1da177e4 | 1180 | |
6b38aefe | 1181 | /* Try setting slave mac to bond address and fall-through |
547942ca NA |
1182 | * to code handling that situation below... |
1183 | */ | |
faeeb317 JW |
1184 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr, |
1185 | bond->dev->addr_len); | |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | /* The slave's address is equal to the address of the bond. | |
1189 | * Search for a spare address in the bond for this slave. | |
1190 | */ | |
9caff1e7 | 1191 | bond_for_each_slave(bond, tmp_slave1, iter) { |
cedb743f | 1192 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1193 | /* no slave has tmp_slave1's perm addr |
1194 | * as its curr addr | |
1195 | */ | |
1196 | free_mac_slave = tmp_slave1; | |
1197 | break; | |
1198 | } | |
1199 | ||
1200 | if (!has_bond_addr) { | |
a6700db1 JP |
1201 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1202 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1203 | |
1204 | has_bond_addr = tmp_slave1; | |
1205 | } | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | if (free_mac_slave) { | |
faeeb317 JW |
1210 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, |
1211 | free_mac_slave->dev->addr_len); | |
1da177e4 | 1212 | |
0a111a03 VF |
1213 | netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n", |
1214 | slave->dev->name, free_mac_slave->dev->name); | |
1da177e4 LT |
1215 | |
1216 | } else if (has_bond_addr) { | |
0a111a03 VF |
1217 | 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", |
1218 | slave->dev->name); | |
1da177e4 LT |
1219 | return -EFAULT; |
1220 | } | |
1221 | ||
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * alb_set_mac_address | |
1227 | * @bond: | |
1228 | * @addr: | |
1229 | * | |
1230 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1231 | * their dev_addr field to different addresses (based on their permanent hw | |
1232 | * addresses). | |
1233 | * | |
1234 | * For each slave, this function sets the interface to the new address and then | |
1235 | * changes its dev_addr field to its previous value. | |
1236 | * | |
1237 | * Unwinding assumes bond's mac address has not yet changed. | |
1238 | */ | |
1239 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1240 | { | |
81f23b13 | 1241 | struct slave *slave, *rollback_slave; |
9caff1e7 | 1242 | struct list_head *iter; |
faeeb317 JW |
1243 | struct sockaddr_storage ss; |
1244 | char tmp_addr[MAX_ADDR_LEN]; | |
1da177e4 | 1245 | int res; |
1da177e4 | 1246 | |
dec1e90e | 1247 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1248 | return 0; |
1da177e4 | 1249 | |
9caff1e7 | 1250 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 | 1251 | /* save net_device's current hw address */ |
faeeb317 JW |
1252 | bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr, |
1253 | slave->dev->addr_len); | |
1da177e4 LT |
1254 | |
1255 | res = dev_set_mac_address(slave->dev, addr); | |
1256 | ||
1257 | /* restore net_device's hw address */ | |
faeeb317 JW |
1258 | bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr, |
1259 | slave->dev->addr_len); | |
1da177e4 | 1260 | |
eb7cc59a | 1261 | if (res) |
1da177e4 | 1262 | goto unwind; |
1da177e4 LT |
1263 | } |
1264 | ||
1265 | return 0; | |
1266 | ||
1267 | unwind: | |
faeeb317 JW |
1268 | memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len); |
1269 | ss.ss_family = bond->dev->type; | |
1da177e4 LT |
1270 | |
1271 | /* unwind from head to the slave that failed */ | |
9caff1e7 | 1272 | bond_for_each_slave(bond, rollback_slave, iter) { |
81f23b13 VF |
1273 | if (rollback_slave == slave) |
1274 | break; | |
faeeb317 JW |
1275 | bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr, |
1276 | rollback_slave->dev->addr_len); | |
1277 | dev_set_mac_address(rollback_slave->dev, | |
1278 | (struct sockaddr *)&ss); | |
1279 | bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr, | |
1280 | rollback_slave->dev->addr_len); | |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | return res; | |
1284 | } | |
1285 | ||
1286 | /************************ exported alb funcions ************************/ | |
1287 | ||
1288 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1289 | { | |
1290 | int res; | |
1291 | ||
1292 | res = tlb_initialize(bond); | |
35d75ee4 | 1293 | if (res) |
1da177e4 | 1294 | return res; |
1da177e4 LT |
1295 | |
1296 | if (rlb_enabled) { | |
1297 | bond->alb_info.rlb_enabled = 1; | |
1da177e4 LT |
1298 | res = rlb_initialize(bond); |
1299 | if (res) { | |
1300 | tlb_deinitialize(bond); | |
1301 | return res; | |
1302 | } | |
b76850ab MW |
1303 | } else { |
1304 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | void bond_alb_deinitialize(struct bonding *bond) | |
1311 | { | |
1312 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1313 | ||
1314 | tlb_deinitialize(bond); | |
1315 | ||
dda0fd5c | 1316 | if (bond_info->rlb_enabled) |
1da177e4 | 1317 | rlb_deinitialize(bond); |
1da177e4 LT |
1318 | } |
1319 | ||
9a49aba1 | 1320 | static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, |
547942ca | 1321 | struct slave *tx_slave) |
9a49aba1 MB |
1322 | { |
1323 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1324 | struct ethhdr *eth_data = eth_hdr(skb); | |
1325 | ||
1326 | if (!tx_slave) { | |
1327 | /* unbalanced or unassigned, send through primary */ | |
1328 | tx_slave = rcu_dereference(bond->curr_active_slave); | |
e9f0fb88 MB |
1329 | if (bond->params.tlb_dynamic_lb) |
1330 | bond_info->unbalanced_load += skb->len; | |
9a49aba1 MB |
1331 | } |
1332 | ||
8557cd74 | 1333 | if (tx_slave && bond_slave_can_tx(tx_slave)) { |
b5091b55 | 1334 | if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { |
9a49aba1 MB |
1335 | ether_addr_copy(eth_data->h_source, |
1336 | tx_slave->dev->dev_addr); | |
1337 | } | |
1338 | ||
1339 | bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1340 | goto out; | |
1341 | } | |
1342 | ||
e9f0fb88 | 1343 | if (tx_slave && bond->params.tlb_dynamic_lb) { |
4bab16d7 | 1344 | spin_lock(&bond->mode_lock); |
9a49aba1 | 1345 | __tlb_clear_slave(bond, tx_slave, 0); |
4bab16d7 | 1346 | spin_unlock(&bond->mode_lock); |
9a49aba1 MB |
1347 | } |
1348 | ||
1349 | /* no suitable interface, frame not sent */ | |
31aa860e | 1350 | bond_tx_drop(bond->dev, skb); |
9a49aba1 MB |
1351 | out: |
1352 | return NETDEV_TX_OK; | |
1353 | } | |
1354 | ||
f05b42ea MB |
1355 | int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
1356 | { | |
1357 | struct bonding *bond = netdev_priv(bond_dev); | |
1358 | struct ethhdr *eth_data; | |
1359 | struct slave *tx_slave = NULL; | |
1360 | u32 hash_index; | |
1361 | ||
1362 | skb_reset_mac_header(skb); | |
1363 | eth_data = eth_hdr(skb); | |
1364 | ||
1365 | /* Do not TX balance any multicast or broadcast */ | |
1366 | if (!is_multicast_ether_addr(eth_data->h_dest)) { | |
1367 | switch (skb->protocol) { | |
1368 | case htons(ETH_P_IP): | |
1369 | case htons(ETH_P_IPX): | |
1370 | /* In case of IPX, it will falback to L2 hash */ | |
1371 | case htons(ETH_P_IPV6): | |
1372 | hash_index = bond_xmit_hash(bond, skb); | |
e9f0fb88 MB |
1373 | if (bond->params.tlb_dynamic_lb) { |
1374 | tx_slave = tlb_choose_channel(bond, | |
1375 | hash_index & 0xFF, | |
1376 | skb->len); | |
1377 | } else { | |
ee637714 MB |
1378 | struct bond_up_slave *slaves; |
1379 | unsigned int count; | |
e9f0fb88 | 1380 | |
ee637714 MB |
1381 | slaves = rcu_dereference(bond->slave_arr); |
1382 | count = slaves ? ACCESS_ONCE(slaves->count) : 0; | |
1383 | if (likely(count)) | |
6b794c1c | 1384 | tx_slave = slaves->arr[hash_index % |
ee637714 | 1385 | count]; |
e9f0fb88 | 1386 | } |
f05b42ea MB |
1387 | break; |
1388 | } | |
1389 | } | |
f05b42ea MB |
1390 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1391 | } | |
1392 | ||
1da177e4 LT |
1393 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
1394 | { | |
454d7c9b | 1395 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1396 | struct ethhdr *eth_data; |
1397 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1398 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1399 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 | 1400 | int hash_size = 0; |
9a49aba1 | 1401 | bool do_tx_balance = true; |
1da177e4 | 1402 | u32 hash_index = 0; |
eddc9ec5 | 1403 | const u8 *hash_start = NULL; |
2d1ea19d | 1404 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1405 | |
459a98ed | 1406 | skb_reset_mac_header(skb); |
1da177e4 LT |
1407 | eth_data = eth_hdr(skb); |
1408 | ||
1da177e4 | 1409 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1410 | case ETH_P_IP: { |
1411 | const struct iphdr *iph = ip_hdr(skb); | |
1412 | ||
a6700db1 | 1413 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1414 | (iph->daddr == ip_bcast) || |
1415 | (iph->protocol == IPPROTO_IGMP)) { | |
9a49aba1 | 1416 | do_tx_balance = false; |
1da177e4 LT |
1417 | break; |
1418 | } | |
eddc9ec5 ACM |
1419 | hash_start = (char *)&(iph->daddr); |
1420 | hash_size = sizeof(iph->daddr); | |
1421 | } | |
1da177e4 LT |
1422 | break; |
1423 | case ETH_P_IPV6: | |
2d1ea19d VY |
1424 | /* IPv6 doesn't really use broadcast mac address, but leave |
1425 | * that here just in case. | |
1426 | */ | |
a6700db1 | 1427 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
9a49aba1 | 1428 | do_tx_balance = false; |
1da177e4 | 1429 | break; |
2d1ea19d VY |
1430 | } |
1431 | ||
1432 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1433 | * broadcasts in IPv4. | |
1434 | */ | |
a6700db1 | 1435 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
9a49aba1 | 1436 | do_tx_balance = false; |
2d1ea19d VY |
1437 | break; |
1438 | } | |
1439 | ||
1440 | /* Additianally, DAD probes should not be tx-balanced as that | |
1441 | * will lead to false positives for duplicate addresses and | |
1442 | * prevent address configuration from working. | |
1443 | */ | |
1444 | ip6hdr = ipv6_hdr(skb); | |
1445 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
9a49aba1 | 1446 | do_tx_balance = false; |
2d1ea19d | 1447 | break; |
1da177e4 LT |
1448 | } |
1449 | ||
0660e03f ACM |
1450 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1451 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1452 | break; |
1453 | case ETH_P_IPX: | |
d3bb52b0 | 1454 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 | 1455 | /* something is wrong with this packet */ |
9a49aba1 | 1456 | do_tx_balance = false; |
1da177e4 LT |
1457 | break; |
1458 | } | |
1459 | ||
1460 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1461 | /* The only protocol worth balancing in | |
1462 | * this family since it has an "ARP" like | |
1463 | * mechanism | |
1464 | */ | |
9a49aba1 | 1465 | do_tx_balance = false; |
1da177e4 LT |
1466 | break; |
1467 | } | |
1468 | ||
b85b6fb1 | 1469 | hash_start = (char *)eth_data->h_dest; |
1da177e4 LT |
1470 | hash_size = ETH_ALEN; |
1471 | break; | |
1472 | case ETH_P_ARP: | |
9a49aba1 | 1473 | do_tx_balance = false; |
dda0fd5c | 1474 | if (bond_info->rlb_enabled) |
1da177e4 | 1475 | tx_slave = rlb_arp_xmit(skb, bond); |
1da177e4 LT |
1476 | break; |
1477 | default: | |
9a49aba1 | 1478 | do_tx_balance = false; |
1da177e4 LT |
1479 | break; |
1480 | } | |
1481 | ||
1482 | if (do_tx_balance) { | |
1483 | hash_index = _simple_hash(hash_start, hash_size); | |
1484 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1485 | } | |
1486 | ||
9a49aba1 | 1487 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1da177e4 LT |
1488 | } |
1489 | ||
1b76b316 | 1490 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1491 | { |
1b76b316 JV |
1492 | struct bonding *bond = container_of(work, struct bonding, |
1493 | alb_work.work); | |
1da177e4 | 1494 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
9caff1e7 | 1495 | struct list_head *iter; |
1da177e4 | 1496 | struct slave *slave; |
1da177e4 | 1497 | |
0965a1f3 | 1498 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1499 | bond_info->tx_rebalance_counter = 0; |
1500 | bond_info->lp_counter = 0; | |
1501 | goto re_arm; | |
1502 | } | |
1503 | ||
733ab639 | 1504 | rcu_read_lock(); |
1505 | ||
1da177e4 LT |
1506 | bond_info->tx_rebalance_counter++; |
1507 | bond_info->lp_counter++; | |
1508 | ||
1509 | /* send learning packets */ | |
7eacd038 | 1510 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
d0c21d43 VY |
1511 | bool strict_match; |
1512 | ||
d0c21d43 VY |
1513 | bond_for_each_slave_rcu(bond, slave, iter) { |
1514 | /* If updating current_active, use all currently | |
1515 | * user mac addreses (!strict_match). Otherwise, only | |
1516 | * use mac of the slave device. | |
14af9963 | 1517 | * In RLB mode, we always use strict matches. |
d0c21d43 | 1518 | */ |
4740d638 | 1519 | strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || |
14af9963 | 1520 | bond_info->rlb_enabled); |
d0c21d43 VY |
1521 | alb_send_learning_packets(slave, slave->dev->dev_addr, |
1522 | strict_match); | |
1523 | } | |
1da177e4 LT |
1524 | bond_info->lp_counter = 0; |
1525 | } | |
1526 | ||
1527 | /* rebalance tx traffic */ | |
1528 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
733ab639 | 1529 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 | 1530 | tlb_clear_slave(bond, slave, 1); |
4740d638 | 1531 | if (slave == rcu_access_pointer(bond->curr_active_slave)) { |
1da177e4 LT |
1532 | SLAVE_TLB_INFO(slave).load = |
1533 | bond_info->unbalanced_load / | |
1534 | BOND_TLB_REBALANCE_INTERVAL; | |
1535 | bond_info->unbalanced_load = 0; | |
1536 | } | |
1537 | } | |
1da177e4 LT |
1538 | bond_info->tx_rebalance_counter = 0; |
1539 | } | |
1540 | ||
1da177e4 | 1541 | if (bond_info->rlb_enabled) { |
1da177e4 LT |
1542 | if (bond_info->primary_is_promisc && |
1543 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1544 | ||
547942ca | 1545 | /* dev_set_promiscuity requires rtnl and |
1f2cd845 DM |
1546 | * nothing else. Avoid race with bond_close. |
1547 | */ | |
733ab639 | 1548 | rcu_read_unlock(); |
1549 | if (!rtnl_trylock()) | |
1f2cd845 | 1550 | goto re_arm; |
1f2cd845 | 1551 | |
1da177e4 LT |
1552 | bond_info->rlb_promisc_timeout_counter = 0; |
1553 | ||
1554 | /* If the primary was set to promiscuous mode | |
1555 | * because a slave was disabled then | |
1556 | * it can now leave promiscuous mode. | |
1557 | */ | |
4740d638 ED |
1558 | dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev, |
1559 | -1); | |
1da177e4 | 1560 | bond_info->primary_is_promisc = 0; |
1f2cd845 DM |
1561 | |
1562 | rtnl_unlock(); | |
733ab639 | 1563 | rcu_read_lock(); |
d0e81b7e | 1564 | } |
1da177e4 LT |
1565 | |
1566 | if (bond_info->rlb_rebalance) { | |
1567 | bond_info->rlb_rebalance = 0; | |
1568 | rlb_rebalance(bond); | |
1569 | } | |
1570 | ||
1571 | /* check if clients need updating */ | |
1572 | if (bond_info->rx_ntt) { | |
1573 | if (bond_info->rlb_update_delay_counter) { | |
1574 | --bond_info->rlb_update_delay_counter; | |
1575 | } else { | |
1576 | rlb_update_rx_clients(bond); | |
dda0fd5c | 1577 | if (bond_info->rlb_update_retry_counter) |
1da177e4 | 1578 | --bond_info->rlb_update_retry_counter; |
dda0fd5c | 1579 | else |
1da177e4 | 1580 | bond_info->rx_ntt = 0; |
1da177e4 LT |
1581 | } |
1582 | } | |
1583 | } | |
733ab639 | 1584 | rcu_read_unlock(); |
1da177e4 | 1585 | re_arm: |
e6d265e8 | 1586 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1587 | } |
1588 | ||
1589 | /* assumption: called before the slave is attached to the bond | |
1590 | * and not locked by the bond lock | |
1591 | */ | |
1592 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1593 | { | |
1594 | int res; | |
1595 | ||
faeeb317 JW |
1596 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, |
1597 | slave->dev->addr_len); | |
dda0fd5c | 1598 | if (res) |
1da177e4 | 1599 | return res; |
1da177e4 | 1600 | |
1da177e4 | 1601 | res = alb_handle_addr_collision_on_attach(bond, slave); |
dda0fd5c | 1602 | if (res) |
1da177e4 | 1603 | return res; |
1da177e4 LT |
1604 | |
1605 | tlb_init_slave(slave); | |
1606 | ||
1607 | /* order a rebalance ASAP */ | |
1608 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1609 | ||
dda0fd5c | 1610 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1611 | bond->alb_info.rlb_rebalance = 1; |
1da177e4 LT |
1612 | |
1613 | return 0; | |
1614 | } | |
1615 | ||
547942ca | 1616 | /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses |
2543331d JV |
1617 | * if necessary. |
1618 | * | |
1619 | * Caller must hold RTNL and no other locks | |
1620 | */ | |
1da177e4 LT |
1621 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1622 | { | |
0965a1f3 | 1623 | if (bond_has_slaves(bond)) |
1da177e4 | 1624 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1625 | |
1626 | tlb_clear_slave(bond, slave, 0); | |
1627 | ||
1628 | if (bond->alb_info.rlb_enabled) { | |
6475ae4c | 1629 | bond->alb_info.rx_slave = NULL; |
1da177e4 LT |
1630 | rlb_clear_slave(bond, slave); |
1631 | } | |
6b794c1c | 1632 | |
1da177e4 LT |
1633 | } |
1634 | ||
1da177e4 LT |
1635 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) |
1636 | { | |
1637 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1638 | ||
1639 | if (link == BOND_LINK_DOWN) { | |
1640 | tlb_clear_slave(bond, slave, 0); | |
73ac0cd4 | 1641 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1642 | rlb_clear_slave(bond, slave); |
1da177e4 LT |
1643 | } else if (link == BOND_LINK_UP) { |
1644 | /* order a rebalance ASAP */ | |
1645 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1646 | if (bond->alb_info.rlb_enabled) { | |
1647 | bond->alb_info.rlb_rebalance = 1; | |
1648 | /* If the updelay module parameter is smaller than the | |
1649 | * forwarding delay of the switch the rebalance will | |
1650 | * not work because the rebalance arp replies will | |
1651 | * not be forwarded to the clients.. | |
1652 | */ | |
1653 | } | |
1654 | } | |
6b794c1c MB |
1655 | |
1656 | if (bond_is_nondyn_tlb(bond)) { | |
ee637714 | 1657 | if (bond_update_slave_arr(bond, NULL)) |
6b794c1c MB |
1658 | pr_err("Failed to build slave-array for TLB mode.\n"); |
1659 | } | |
1da177e4 LT |
1660 | } |
1661 | ||
1662 | /** | |
1663 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1664 | * @bond: our bonding struct | |
1665 | * @new_slave: new slave to assign | |
1666 | * | |
1667 | * Set the bond->curr_active_slave to @new_slave and handle | |
1668 | * mac address swapping and promiscuity changes as needed. | |
1669 | * | |
62c5f518 | 1670 | * Caller must hold RTNL |
1da177e4 LT |
1671 | */ |
1672 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1673 | { | |
1674 | struct slave *swap_slave; | |
4740d638 | 1675 | struct slave *curr_active; |
1da177e4 | 1676 | |
62c5f518 | 1677 | curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 | 1678 | if (curr_active == new_slave) |
1da177e4 | 1679 | return; |
1da177e4 | 1680 | |
4740d638 ED |
1681 | if (curr_active && bond->alb_info.primary_is_promisc) { |
1682 | dev_set_promiscuity(curr_active->dev, -1); | |
1da177e4 LT |
1683 | bond->alb_info.primary_is_promisc = 0; |
1684 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1685 | } | |
1686 | ||
4740d638 | 1687 | swap_slave = curr_active; |
278b2083 | 1688 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1689 | |
0965a1f3 | 1690 | if (!new_slave || !bond_has_slaves(bond)) |
1da177e4 | 1691 | return; |
1da177e4 LT |
1692 | |
1693 | /* set the new curr_active_slave to the bonds mac address | |
1694 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1695 | */ | |
b88ec38d VF |
1696 | if (!swap_slave) |
1697 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1698 | |
547942ca | 1699 | /* Arrange for swap_slave and new_slave to temporarily be |
059fe7a5 JV |
1700 | * ignored so we can mess with their MAC addresses without |
1701 | * fear of interference from transmit activity. | |
1702 | */ | |
dec1e90e | 1703 | if (swap_slave) |
059fe7a5 | 1704 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1705 | tlb_clear_slave(bond, new_slave, 1); |
1706 | ||
4996b909 VF |
1707 | /* in TLB mode, the slave might flip down/up with the old dev_addr, |
1708 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1709 | */ | |
01844098 | 1710 | if (BOND_MODE(bond) == BOND_MODE_TLB) { |
faeeb317 JW |
1711 | struct sockaddr_storage ss; |
1712 | u8 tmp_addr[MAX_ADDR_LEN]; | |
4996b909 | 1713 | |
faeeb317 JW |
1714 | bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr, |
1715 | new_slave->dev->addr_len); | |
4996b909 | 1716 | |
faeeb317 JW |
1717 | bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, |
1718 | bond->dev->addr_len); | |
1719 | ss.ss_family = bond->dev->type; | |
4996b909 | 1720 | /* we don't care if it can't change its mac, best effort */ |
faeeb317 | 1721 | dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss); |
4996b909 | 1722 | |
faeeb317 JW |
1723 | bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr, |
1724 | new_slave->dev->addr_len); | |
4996b909 VF |
1725 | } |
1726 | ||
1da177e4 LT |
1727 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1728 | if (swap_slave) { | |
1729 | /* swap mac address */ | |
43547ea6 | 1730 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 JV |
1731 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
1732 | } else { | |
b88ec38d | 1733 | /* set the new_slave to the bond mac address */ |
faeeb317 JW |
1734 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, |
1735 | bond->dev->addr_len); | |
d0c21d43 VY |
1736 | alb_send_learning_packets(new_slave, bond->dev->dev_addr, |
1737 | false); | |
1da177e4 LT |
1738 | } |
1739 | } | |
1740 | ||
ecfede42 | 1741 | /* Called with RTNL */ |
1da177e4 LT |
1742 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1743 | { | |
454d7c9b | 1744 | struct bonding *bond = netdev_priv(bond_dev); |
faeeb317 | 1745 | struct sockaddr_storage *ss = addr; |
4740d638 | 1746 | struct slave *curr_active; |
b88ec38d | 1747 | struct slave *swap_slave; |
1da177e4 | 1748 | int res; |
1da177e4 | 1749 | |
faeeb317 | 1750 | if (!is_valid_ether_addr(ss->__data)) |
1da177e4 | 1751 | return -EADDRNOTAVAIL; |
1da177e4 LT |
1752 | |
1753 | res = alb_set_mac_address(bond, addr); | |
73ac0cd4 | 1754 | if (res) |
1da177e4 | 1755 | return res; |
1da177e4 | 1756 | |
faeeb317 | 1757 | bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len); |
1da177e4 LT |
1758 | |
1759 | /* If there is no curr_active_slave there is nothing else to do. | |
1760 | * Otherwise we'll need to pass the new address to it and handle | |
1761 | * duplications. | |
1762 | */ | |
4740d638 ED |
1763 | curr_active = rtnl_dereference(bond->curr_active_slave); |
1764 | if (!curr_active) | |
1da177e4 | 1765 | return 0; |
1da177e4 | 1766 | |
b88ec38d | 1767 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1768 | |
1769 | if (swap_slave) { | |
4740d638 ED |
1770 | alb_swap_mac_addr(swap_slave, curr_active); |
1771 | alb_fasten_mac_swap(bond, swap_slave, curr_active); | |
1da177e4 | 1772 | } else { |
faeeb317 JW |
1773 | alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr, |
1774 | bond_dev->addr_len); | |
1da177e4 | 1775 | |
4740d638 | 1776 | alb_send_learning_packets(curr_active, |
d0c21d43 | 1777 | bond_dev->dev_addr, false); |
1da177e4 LT |
1778 | if (bond->alb_info.rlb_enabled) { |
1779 | /* inform clients mac address has changed */ | |
4740d638 | 1780 | rlb_req_update_slave_clients(bond, curr_active); |
1da177e4 LT |
1781 | } |
1782 | } | |
1783 | ||
1784 | return 0; | |
1785 | } | |
1786 | ||
1787 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1788 | { | |
73ac0cd4 | 1789 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1790 | rlb_clear_vlan(bond, vlan_id); |
1da177e4 LT |
1791 | } |
1792 |