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f620b43a BP |
1 | /* |
2 | * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | ||
19 | #include "bond.h" | |
20 | ||
21 | #include <limits.h> | |
22 | #include <stdint.h> | |
23 | #include <stdlib.h> | |
24 | ||
25 | #include "coverage.h" | |
26 | #include "dynamic-string.h" | |
27 | #include "flow.h" | |
28 | #include "hmap.h" | |
f620b43a BP |
29 | #include "list.h" |
30 | #include "netdev.h" | |
31 | #include "odp-util.h" | |
32 | #include "ofpbuf.h" | |
33 | #include "packets.h" | |
34 | #include "poll-loop.h" | |
35 | #include "tag.h" | |
36 | #include "timeval.h" | |
37 | #include "unixctl.h" | |
38 | #include "vlog.h" | |
39 | ||
40 | VLOG_DEFINE_THIS_MODULE(bond); | |
41 | ||
f620b43a BP |
42 | /* Bit-mask for hashing a flow down to a bucket. |
43 | * There are (BOND_MASK + 1) buckets. */ | |
44 | #define BOND_MASK 0xff | |
45 | ||
46 | /* A hash bucket for mapping a flow to a slave. | |
47 | * "struct bond" has an array of (BOND_MASK + 1) of these. */ | |
48 | struct bond_entry { | |
49 | struct bond_slave *slave; /* Assigned slave, NULL if unassigned. */ | |
50 | uint64_t tx_bytes; /* Count of bytes recently transmitted. */ | |
51 | tag_type tag; /* Tag for entry<->slave association. */ | |
52 | struct list list_node; /* In bond_slave's 'entries' list. */ | |
53 | }; | |
54 | ||
55 | /* A bond slave, that is, one of the links comprising a bond. */ | |
56 | struct bond_slave { | |
57 | struct hmap_node hmap_node; /* In struct bond's slaves hmap. */ | |
58 | struct bond *bond; /* The bond that contains this slave. */ | |
59 | void *aux; /* Client-provided handle for this slave. */ | |
60 | ||
61 | struct netdev *netdev; /* Network device, owned by the client. */ | |
62 | char *name; /* Name (a copy of netdev_get_name(netdev)). */ | |
63 | ||
64 | /* Link status. */ | |
65 | long long delay_expires; /* Time after which 'enabled' may change. */ | |
f620b43a | 66 | bool enabled; /* May be chosen for flows? */ |
4d6fb5eb | 67 | bool lacp_may_enable; /* LACP considers this interface bondable. */ |
f620b43a BP |
68 | tag_type tag; /* Tag associated with this slave. */ |
69 | ||
70 | /* Rebalancing info. Used only by bond_rebalance(). */ | |
71 | struct list bal_node; /* In bond_rebalance()'s 'bals' list. */ | |
72 | struct list entries; /* 'struct bond_entry's assigned here. */ | |
73 | uint64_t tx_bytes; /* Sum across 'tx_bytes' of entries. */ | |
fb0b29a3 EJ |
74 | |
75 | /* BM_STABLE specific bonding info. */ | |
75135fa0 | 76 | uint32_t stb_id; /* ID used for 'stb_slaves' ordering. */ |
f620b43a BP |
77 | }; |
78 | ||
79 | /* A bond, that is, a set of network devices grouped to improve performance or | |
80 | * robustness. */ | |
81 | struct bond { | |
82 | struct hmap_node hmap_node; /* In 'all_bonds' hmap. */ | |
83 | char *name; /* Name provided by client. */ | |
84 | ||
85 | /* Slaves. */ | |
86 | struct hmap slaves; | |
87 | ||
88 | /* Bonding info. */ | |
89 | enum bond_mode balance; /* Balancing mode, one of BM_*. */ | |
90 | struct bond_slave *active_slave; | |
91 | tag_type no_slaves_tag; /* Tag for flows when all slaves disabled. */ | |
92 | int updelay, downdelay; /* Delay before slave goes up/down, in ms. */ | |
4d6fb5eb | 93 | bool lacp_negotiated; /* LACP negotiations were successful. */ |
62904702 | 94 | bool bond_revalidate; /* True if flows need revalidation. */ |
672d18b2 | 95 | uint32_t basis; /* Basis for flow hash function. */ |
f620b43a BP |
96 | |
97 | /* SLB specific bonding info. */ | |
98 | struct bond_entry *hash; /* An array of (BOND_MASK + 1) elements. */ | |
99 | int rebalance_interval; /* Interval between rebalances, in ms. */ | |
100 | long long int next_rebalance; /* Next rebalancing time. */ | |
101 | bool send_learning_packets; | |
102 | ||
fb0b29a3 | 103 | /* BM_STABLE specific bonding info. */ |
8bb6f31d | 104 | tag_type stb_tag; /* Tag associated with this bond. */ |
f620b43a BP |
105 | |
106 | /* Monitoring. */ | |
f620b43a | 107 | struct netdev_monitor *monitor; /* detect == BLSM_CARRIER only. */ |
f620b43a BP |
108 | |
109 | /* Legacy compatibility. */ | |
110 | long long int next_fake_iface_update; /* LLONG_MAX if disabled. */ | |
111 | ||
112 | /* Tag set saved for next bond_run(). This tag set is a kluge for cases | |
113 | * where we can't otherwise provide revalidation feedback to the client. | |
114 | * That's only unixctl commands now; I hope no other cases will arise. */ | |
115 | struct tag_set unixctl_tags; | |
116 | }; | |
117 | ||
118 | static struct hmap all_bonds = HMAP_INITIALIZER(&all_bonds); | |
119 | ||
95aafb2a | 120 | static void bond_entry_reset(struct bond *); |
f620b43a | 121 | static struct bond_slave *bond_slave_lookup(struct bond *, const void *slave_); |
f620b43a BP |
122 | static void bond_enable_slave(struct bond_slave *, bool enable, |
123 | struct tag_set *); | |
124 | static void bond_link_status_update(struct bond_slave *, struct tag_set *); | |
125 | static void bond_choose_active_slave(struct bond *, struct tag_set *); | |
126 | static bool bond_is_tcp_hash(const struct bond *); | |
127 | static unsigned int bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], | |
672d18b2 EJ |
128 | uint16_t vlan, uint32_t basis); |
129 | static unsigned int bond_hash_tcp(const struct flow *, uint16_t vlan, | |
130 | uint32_t basis); | |
f620b43a BP |
131 | static struct bond_entry *lookup_bond_entry(const struct bond *, |
132 | const struct flow *, | |
133 | uint16_t vlan); | |
134 | static tag_type bond_get_active_slave_tag(const struct bond *); | |
135 | static struct bond_slave *choose_output_slave(const struct bond *, | |
136 | const struct flow *, | |
137 | uint16_t vlan); | |
138 | static void bond_update_fake_slave_stats(struct bond *); | |
139 | ||
140 | /* Attempts to parse 's' as the name of a bond balancing mode. If successful, | |
141 | * stores the mode in '*balance' and returns true. Otherwise returns false | |
142 | * without modifying '*balance'. */ | |
143 | bool | |
144 | bond_mode_from_string(enum bond_mode *balance, const char *s) | |
145 | { | |
146 | if (!strcmp(s, bond_mode_to_string(BM_TCP))) { | |
147 | *balance = BM_TCP; | |
148 | } else if (!strcmp(s, bond_mode_to_string(BM_SLB))) { | |
149 | *balance = BM_SLB; | |
fb0b29a3 EJ |
150 | } else if (!strcmp(s, bond_mode_to_string(BM_STABLE))) { |
151 | *balance = BM_STABLE; | |
f620b43a BP |
152 | } else if (!strcmp(s, bond_mode_to_string(BM_AB))) { |
153 | *balance = BM_AB; | |
154 | } else { | |
155 | return false; | |
156 | } | |
157 | return true; | |
158 | } | |
159 | ||
160 | /* Returns a string representing 'balance'. */ | |
161 | const char * | |
162 | bond_mode_to_string(enum bond_mode balance) { | |
163 | switch (balance) { | |
164 | case BM_TCP: | |
165 | return "balance-tcp"; | |
166 | case BM_SLB: | |
167 | return "balance-slb"; | |
fb0b29a3 EJ |
168 | case BM_STABLE: |
169 | return "stable"; | |
f620b43a BP |
170 | case BM_AB: |
171 | return "active-backup"; | |
172 | } | |
173 | NOT_REACHED(); | |
174 | } | |
175 | ||
f620b43a BP |
176 | \f |
177 | /* Creates and returns a new bond whose configuration is initially taken from | |
178 | * 's'. | |
179 | * | |
180 | * The caller should register each slave on the new bond by calling | |
181 | * bond_slave_register(). */ | |
182 | struct bond * | |
183 | bond_create(const struct bond_settings *s) | |
184 | { | |
185 | struct bond *bond; | |
186 | ||
187 | bond = xzalloc(sizeof *bond); | |
188 | hmap_init(&bond->slaves); | |
189 | bond->no_slaves_tag = tag_create_random(); | |
7321e30e | 190 | bond->stb_tag = tag_create_random(); |
f620b43a | 191 | bond->next_fake_iface_update = LLONG_MAX; |
1670c579 | 192 | bond->monitor = netdev_monitor_create(); |
f620b43a BP |
193 | |
194 | bond_reconfigure(bond, s); | |
195 | ||
196 | tag_set_init(&bond->unixctl_tags); | |
197 | ||
198 | return bond; | |
199 | } | |
200 | ||
201 | /* Frees 'bond'. */ | |
202 | void | |
203 | bond_destroy(struct bond *bond) | |
204 | { | |
205 | struct bond_slave *slave, *next_slave; | |
206 | ||
207 | if (!bond) { | |
208 | return; | |
209 | } | |
210 | ||
211 | hmap_remove(&all_bonds, &bond->hmap_node); | |
212 | ||
213 | HMAP_FOR_EACH_SAFE (slave, next_slave, hmap_node, &bond->slaves) { | |
214 | hmap_remove(&bond->slaves, &slave->hmap_node); | |
215 | /* Client owns 'slave->netdev'. */ | |
216 | free(slave->name); | |
217 | free(slave); | |
218 | } | |
219 | hmap_destroy(&bond->slaves); | |
220 | ||
221 | free(bond->hash); | |
222 | ||
f620b43a BP |
223 | netdev_monitor_destroy(bond->monitor); |
224 | ||
225 | free(bond->name); | |
226 | free(bond); | |
227 | } | |
228 | ||
229 | /* Updates 'bond''s overall configuration to 's'. | |
230 | * | |
231 | * The caller should register each slave on 'bond' by calling | |
232 | * bond_slave_register(). This is optional if none of the slaves' | |
4d6fb5eb | 233 | * configuration has changed. In any case it can't hurt. |
59d7b2b6 EJ |
234 | * |
235 | * Returns true if the configuration has changed in such a way that requires | |
236 | * flow revalidation. | |
237 | * */ | |
238 | bool | |
f620b43a BP |
239 | bond_reconfigure(struct bond *bond, const struct bond_settings *s) |
240 | { | |
59d7b2b6 EJ |
241 | bool revalidate = false; |
242 | ||
f620b43a BP |
243 | if (!bond->name || strcmp(bond->name, s->name)) { |
244 | if (bond->name) { | |
245 | hmap_remove(&all_bonds, &bond->hmap_node); | |
246 | free(bond->name); | |
247 | } | |
248 | bond->name = xstrdup(s->name); | |
249 | hmap_insert(&all_bonds, &bond->hmap_node, hash_string(bond->name, 0)); | |
250 | } | |
251 | ||
f620b43a BP |
252 | bond->updelay = s->up_delay; |
253 | bond->downdelay = s->down_delay; | |
254 | bond->rebalance_interval = s->rebalance_interval; | |
255 | ||
59d7b2b6 EJ |
256 | if (bond->balance != s->balance) { |
257 | bond->balance = s->balance; | |
258 | revalidate = true; | |
259 | } | |
260 | ||
672d18b2 EJ |
261 | if (bond->basis != s->basis) { |
262 | bond->basis = s->basis; | |
263 | revalidate = true; | |
264 | } | |
265 | ||
f620b43a BP |
266 | if (s->fake_iface) { |
267 | if (bond->next_fake_iface_update == LLONG_MAX) { | |
268 | bond->next_fake_iface_update = time_msec(); | |
269 | } | |
270 | } else { | |
271 | bond->next_fake_iface_update = LLONG_MAX; | |
272 | } | |
59d7b2b6 | 273 | |
62904702 EJ |
274 | if (bond->bond_revalidate) { |
275 | revalidate = true; | |
276 | bond->bond_revalidate = false; | |
277 | } | |
278 | ||
95aafb2a EJ |
279 | if (bond->balance == BM_AB || !bond->hash || revalidate) { |
280 | bond_entry_reset(bond); | |
281 | } | |
282 | ||
59d7b2b6 | 283 | return revalidate; |
f620b43a BP |
284 | } |
285 | ||
f8ddccd2 BP |
286 | static void |
287 | bond_slave_set_netdev__(struct bond *bond, struct bond_slave *slave, | |
288 | struct netdev *netdev) | |
289 | { | |
290 | if (slave->netdev != netdev) { | |
1670c579 EJ |
291 | if (slave->netdev) { |
292 | netdev_monitor_remove(bond->monitor, slave->netdev); | |
f8ddccd2 | 293 | } |
1670c579 | 294 | netdev_monitor_add(bond->monitor, netdev); |
f8ddccd2 BP |
295 | slave->netdev = netdev; |
296 | } | |
297 | } | |
298 | ||
f620b43a BP |
299 | /* Registers 'slave_' as a slave of 'bond'. The 'slave_' pointer is an |
300 | * arbitrary client-provided pointer that uniquely identifies a slave within a | |
301 | * bond. If 'slave_' already exists within 'bond' then this function | |
302 | * reconfigures the existing slave. | |
303 | * | |
e1e90548 EJ |
304 | * 'stb_id' is used in BM_STABLE bonds to guarantee consistent slave choices |
305 | * across restarts and distributed vswitch instances. It should be unique per | |
306 | * slave, and preferably consistent across restarts and reconfigurations. | |
307 | * | |
f620b43a BP |
308 | * 'netdev' must be the network device that 'slave_' represents. It is owned |
309 | * by the client, so the client must not close it before either unregistering | |
310 | * 'slave_' or destroying 'bond'. | |
4d6fb5eb | 311 | */ |
f620b43a | 312 | void |
75135fa0 | 313 | bond_slave_register(struct bond *bond, void *slave_, uint32_t stb_id, |
e1e90548 | 314 | struct netdev *netdev) |
f620b43a BP |
315 | { |
316 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
317 | ||
318 | if (!slave) { | |
319 | slave = xzalloc(sizeof *slave); | |
320 | ||
321 | hmap_insert(&bond->slaves, &slave->hmap_node, hash_pointer(slave_, 0)); | |
322 | slave->bond = bond; | |
323 | slave->aux = slave_; | |
324 | slave->delay_expires = LLONG_MAX; | |
244b2160 | 325 | slave->name = xstrdup(netdev_get_name(netdev)); |
7321e30e | 326 | bond->bond_revalidate = true; |
244b2160 | 327 | |
b3c18f66 | 328 | slave->enabled = false; |
c8544aa1 | 329 | bond_enable_slave(slave, netdev_get_carrier(netdev), NULL); |
f620b43a BP |
330 | } |
331 | ||
e1e90548 | 332 | if (slave->stb_id != stb_id) { |
e1e90548 | 333 | slave->stb_id = stb_id; |
7321e30e | 334 | bond->bond_revalidate = true; |
e1e90548 EJ |
335 | } |
336 | ||
f8ddccd2 | 337 | bond_slave_set_netdev__(bond, slave, netdev); |
a6934aa9 | 338 | |
f620b43a BP |
339 | free(slave->name); |
340 | slave->name = xstrdup(netdev_get_name(netdev)); | |
f620b43a BP |
341 | } |
342 | ||
f8ddccd2 BP |
343 | /* Updates the network device to be used with 'slave_' to 'netdev'. |
344 | * | |
345 | * This is useful if the caller closes and re-opens the network device | |
346 | * registered with bond_slave_register() but doesn't need to change anything | |
347 | * else. */ | |
348 | void | |
349 | bond_slave_set_netdev(struct bond *bond, void *slave_, struct netdev *netdev) | |
350 | { | |
351 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
352 | if (slave) { | |
353 | bond_slave_set_netdev__(bond, slave, netdev); | |
354 | } | |
355 | } | |
356 | ||
f620b43a BP |
357 | /* Unregisters 'slave_' from 'bond'. If 'bond' does not contain such a slave |
358 | * then this function has no effect. | |
359 | * | |
360 | * Unregistering a slave invalidates all flows. */ | |
361 | void | |
362 | bond_slave_unregister(struct bond *bond, const void *slave_) | |
363 | { | |
364 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
365 | bool del_active; | |
366 | ||
367 | if (!slave) { | |
368 | return; | |
369 | } | |
370 | ||
1670c579 | 371 | netdev_monitor_remove(bond->monitor, slave->netdev); |
b3c18f66 EJ |
372 | bond_enable_slave(slave, false, NULL); |
373 | ||
f620b43a BP |
374 | del_active = bond->active_slave == slave; |
375 | if (bond->hash) { | |
376 | struct bond_entry *e; | |
377 | for (e = bond->hash; e <= &bond->hash[BOND_MASK]; e++) { | |
378 | if (e->slave == slave) { | |
379 | e->slave = NULL; | |
380 | } | |
381 | } | |
382 | } | |
383 | ||
384 | free(slave->name); | |
385 | ||
386 | hmap_remove(&bond->slaves, &slave->hmap_node); | |
387 | /* Client owns 'slave->netdev'. */ | |
388 | free(slave); | |
389 | ||
390 | if (del_active) { | |
391 | struct tag_set tags; | |
392 | ||
393 | tag_set_init(&tags); | |
394 | bond_choose_active_slave(bond, &tags); | |
395 | bond->send_learning_packets = true; | |
396 | } | |
397 | } | |
398 | ||
4d6fb5eb EJ |
399 | /* Should be called on each slave in 'bond' before bond_run() to indicate the |
400 | * results of lacp_slave_may_enable() on 'slave_'. */ | |
401 | void | |
402 | bond_slave_set_lacp_may_enable(struct bond *bond, void *slave_, | |
403 | bool may_enable) | |
404 | { | |
405 | bond_slave_lookup(bond, slave_)->lacp_may_enable = may_enable; | |
406 | } | |
407 | ||
f620b43a BP |
408 | /* Performs periodic maintenance on 'bond'. The caller must provide 'tags' to |
409 | * allow tagged flows to be invalidated. | |
410 | * | |
411 | * The caller should check bond_should_send_learning_packets() afterward. */ | |
412 | void | |
4d6fb5eb | 413 | bond_run(struct bond *bond, struct tag_set *tags, bool lacp_negotiated) |
f620b43a BP |
414 | { |
415 | struct bond_slave *slave; | |
dc9908b3 | 416 | bool is_tcp_hash = bond_is_tcp_hash(bond); |
f620b43a | 417 | |
4d6fb5eb EJ |
418 | bond->lacp_negotiated = lacp_negotiated; |
419 | ||
aa77020c EJ |
420 | if (bond->monitor) { |
421 | netdev_monitor_flush(bond->monitor); | |
422 | } | |
423 | ||
f620b43a BP |
424 | /* Enable slaves based on link status and LACP feedback. */ |
425 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
426 | bond_link_status_update(slave, tags); | |
427 | } | |
428 | if (!bond->active_slave || !bond->active_slave->enabled) { | |
429 | bond_choose_active_slave(bond, tags); | |
430 | } | |
431 | ||
432 | /* Update fake bond interface stats. */ | |
433 | if (time_msec() >= bond->next_fake_iface_update) { | |
434 | bond_update_fake_slave_stats(bond); | |
435 | bond->next_fake_iface_update = time_msec() + 1000; | |
436 | } | |
437 | ||
62904702 EJ |
438 | if (is_tcp_hash != bond_is_tcp_hash(bond)) { |
439 | bond->bond_revalidate = true; | |
440 | } | |
441 | ||
442 | if (bond->bond_revalidate) { | |
443 | bond->bond_revalidate = false; | |
dc9908b3 | 444 | |
95aafb2a | 445 | bond_entry_reset(bond); |
8bb6f31d EJ |
446 | if (bond->balance != BM_STABLE) { |
447 | struct bond_slave *slave; | |
448 | ||
449 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
450 | tag_set_add(tags, slave->tag); | |
451 | } | |
452 | } else { | |
453 | tag_set_add(tags, bond->stb_tag); | |
dc9908b3 | 454 | } |
0008fbcb | 455 | tag_set_add(tags, bond->no_slaves_tag); |
dc9908b3 EJ |
456 | } |
457 | ||
f620b43a BP |
458 | /* Invalidate any tags required by */ |
459 | tag_set_union(tags, &bond->unixctl_tags); | |
460 | tag_set_init(&bond->unixctl_tags); | |
461 | } | |
462 | ||
463 | /* Causes poll_block() to wake up when 'bond' needs something to be done. */ | |
464 | void | |
465 | bond_wait(struct bond *bond) | |
466 | { | |
467 | struct bond_slave *slave; | |
468 | ||
1670c579 | 469 | netdev_monitor_poll_wait(bond->monitor); |
f620b43a BP |
470 | |
471 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
472 | if (slave->delay_expires != LLONG_MAX) { | |
473 | poll_timer_wait_until(slave->delay_expires); | |
474 | } | |
475 | } | |
476 | ||
477 | if (bond->next_fake_iface_update != LLONG_MAX) { | |
478 | poll_timer_wait_until(bond->next_fake_iface_update); | |
479 | } | |
480 | ||
481 | /* Ensure that any saved tags get revalidated right away. */ | |
482 | if (!tag_set_is_empty(&bond->unixctl_tags)) { | |
483 | poll_immediate_wake(); | |
484 | } | |
485 | ||
486 | /* We don't wait for bond->next_rebalance because rebalancing can only run | |
487 | * at a flow account checkpoint. ofproto does checkpointing on its own | |
488 | * schedule and bond_rebalance() gets called afterward, so we'd just be | |
489 | * waking up for no purpose. */ | |
490 | } | |
491 | \f | |
492 | /* MAC learning table interaction. */ | |
493 | ||
494 | static bool | |
495 | may_send_learning_packets(const struct bond *bond) | |
496 | { | |
4d6fb5eb | 497 | return !bond->lacp_negotiated && bond->balance != BM_AB; |
f620b43a BP |
498 | } |
499 | ||
500 | /* Returns true if 'bond' needs the client to send out packets to assist with | |
501 | * MAC learning on 'bond'. If this function returns true, then the client | |
502 | * should iterate through its MAC learning table for the bridge on which 'bond' | |
503 | * is located. For each MAC that has been learned on a port other than 'bond', | |
504 | * it should call bond_send_learning_packet(). | |
505 | * | |
506 | * This function will only return true if 'bond' is in SLB mode and LACP is not | |
507 | * negotiated. Otherwise sending learning packets isn't necessary. | |
508 | * | |
509 | * Calling this function resets the state that it checks. */ | |
510 | bool | |
511 | bond_should_send_learning_packets(struct bond *bond) | |
512 | { | |
513 | bool send = bond->send_learning_packets && may_send_learning_packets(bond); | |
514 | bond->send_learning_packets = false; | |
515 | return send; | |
516 | } | |
517 | ||
518 | /* Sends a gratuitous learning packet on 'bond' from 'eth_src' on 'vlan'. | |
519 | * | |
520 | * See bond_should_send_learning_packets() for description of usage. */ | |
521 | int | |
522 | bond_send_learning_packet(struct bond *bond, | |
523 | const uint8_t eth_src[ETH_ADDR_LEN], | |
524 | uint16_t vlan) | |
525 | { | |
526 | struct bond_slave *slave; | |
527 | struct ofpbuf packet; | |
528 | struct flow flow; | |
529 | int error; | |
530 | ||
531 | assert(may_send_learning_packets(bond)); | |
532 | if (!bond->active_slave) { | |
533 | /* Nowhere to send the learning packet. */ | |
534 | return 0; | |
535 | } | |
536 | ||
537 | memset(&flow, 0, sizeof flow); | |
538 | memcpy(flow.dl_src, eth_src, ETH_ADDR_LEN); | |
539 | slave = choose_output_slave(bond, &flow, vlan); | |
540 | ||
541 | ofpbuf_init(&packet, 0); | |
542 | compose_benign_packet(&packet, "Open vSwitch Bond Failover", 0xf177, | |
543 | eth_src); | |
544 | if (vlan) { | |
545 | eth_set_vlan_tci(&packet, htons(vlan)); | |
546 | } | |
547 | error = netdev_send(slave->netdev, &packet); | |
548 | ofpbuf_uninit(&packet); | |
549 | ||
550 | return error; | |
551 | } | |
552 | \f | |
553 | /* Checks whether a packet that arrived on 'slave_' within 'bond', with an | |
554 | * Ethernet destination address of 'eth_dst', should be admitted. | |
555 | * | |
556 | * The return value is one of the following: | |
557 | * | |
558 | * - BV_ACCEPT: Admit the packet. | |
559 | * | |
560 | * - BV_DROP: Drop the packet. | |
561 | * | |
562 | * - BV_DROP_IF_MOVED: Consult the MAC learning table for the packet's | |
563 | * Ethernet source address and VLAN. If there is none, or if the packet | |
564 | * is on the learned port, then admit the packet. If a different port has | |
565 | * been learned, however, drop the packet (and do not use it for MAC | |
566 | * learning). | |
567 | */ | |
568 | enum bond_verdict | |
569 | bond_check_admissibility(struct bond *bond, const void *slave_, | |
570 | const uint8_t eth_dst[ETH_ADDR_LEN], tag_type *tags) | |
571 | { | |
572 | /* Admit all packets if LACP has been negotiated, because that means that | |
573 | * the remote switch is aware of the bond and will "do the right thing". */ | |
4d6fb5eb | 574 | if (bond->lacp_negotiated) { |
f620b43a BP |
575 | return BV_ACCEPT; |
576 | } | |
577 | ||
578 | /* Drop all multicast packets on inactive slaves. */ | |
579 | if (eth_addr_is_multicast(eth_dst)) { | |
580 | *tags |= bond_get_active_slave_tag(bond); | |
581 | if (bond->active_slave != bond_slave_lookup(bond, slave_)) { | |
582 | return BV_DROP; | |
583 | } | |
584 | } | |
585 | ||
586 | /* Drop all packets for which we have learned a different input port, | |
587 | * because we probably sent the packet on one slave and got it back on the | |
588 | * other. Gratuitous ARP packets are an exception to this rule: the host | |
589 | * has moved to another switch. The exception to the exception is if we | |
590 | * locked the learning table to avoid reflections on bond slaves. */ | |
591 | return BV_DROP_IF_MOVED; | |
592 | } | |
593 | ||
594 | /* Returns the slave (registered on 'bond' by bond_slave_register()) to which | |
595 | * a packet with the given 'flow' and 'vlan' should be forwarded. Returns | |
596 | * NULL if the packet should be dropped because no slaves are enabled. | |
597 | * | |
598 | * 'vlan' is not necessarily the same as 'flow->vlan_tci'. First, 'vlan' | |
599 | * should be a VID only (i.e. excluding the PCP bits). Second, | |
600 | * 'flow->vlan_tci' is the VLAN TCI that appeared on the packet (so it will be | |
601 | * nonzero only for trunk ports), whereas 'vlan' is the logical VLAN that the | |
602 | * packet belongs to (so for an access port it will be the access port's VLAN). | |
603 | * | |
604 | * Adds a tag to '*tags' that associates the flow with the returned slave. | |
605 | */ | |
606 | void * | |
607 | bond_choose_output_slave(struct bond *bond, const struct flow *flow, | |
608 | uint16_t vlan, tag_type *tags) | |
609 | { | |
610 | struct bond_slave *slave = choose_output_slave(bond, flow, vlan); | |
611 | if (slave) { | |
8bb6f31d | 612 | *tags |= bond->balance == BM_STABLE ? bond->stb_tag : slave->tag; |
f620b43a BP |
613 | return slave->aux; |
614 | } else { | |
615 | *tags |= bond->no_slaves_tag; | |
616 | return NULL; | |
617 | } | |
618 | } | |
f620b43a BP |
619 | \f |
620 | /* Rebalancing. */ | |
621 | ||
1b137691 EJ |
622 | static bool |
623 | bond_is_balanced(const struct bond *bond) | |
624 | { | |
625 | return bond->balance == BM_SLB || bond->balance == BM_TCP; | |
626 | } | |
627 | ||
f620b43a BP |
628 | /* Notifies 'bond' that 'n_bytes' bytes were sent in 'flow' within 'vlan'. */ |
629 | void | |
630 | bond_account(struct bond *bond, const struct flow *flow, uint16_t vlan, | |
631 | uint64_t n_bytes) | |
632 | { | |
f620b43a | 633 | |
1b137691 | 634 | if (bond_is_balanced(bond)) { |
f620b43a | 635 | lookup_bond_entry(bond, flow, vlan)->tx_bytes += n_bytes; |
f620b43a BP |
636 | } |
637 | } | |
638 | ||
639 | static struct bond_slave * | |
640 | bond_slave_from_bal_node(struct list *bal) | |
641 | { | |
642 | return CONTAINER_OF(bal, struct bond_slave, bal_node); | |
643 | } | |
644 | ||
645 | static void | |
646 | log_bals(struct bond *bond, const struct list *bals) | |
647 | { | |
648 | if (VLOG_IS_DBG_ENABLED()) { | |
649 | struct ds ds = DS_EMPTY_INITIALIZER; | |
650 | const struct bond_slave *slave; | |
651 | ||
652 | LIST_FOR_EACH (slave, bal_node, bals) { | |
653 | if (ds.length) { | |
654 | ds_put_char(&ds, ','); | |
655 | } | |
656 | ds_put_format(&ds, " %s %"PRIu64"kB", | |
657 | slave->name, slave->tx_bytes / 1024); | |
658 | ||
659 | if (!slave->enabled) { | |
660 | ds_put_cstr(&ds, " (disabled)"); | |
661 | } | |
662 | if (!list_is_empty(&slave->entries)) { | |
663 | struct bond_entry *e; | |
664 | ||
665 | ds_put_cstr(&ds, " ("); | |
666 | LIST_FOR_EACH (e, list_node, &slave->entries) { | |
667 | if (&e->list_node != list_front(&slave->entries)) { | |
668 | ds_put_cstr(&ds, " + "); | |
669 | } | |
670 | ds_put_format(&ds, "h%td: %"PRIu64"kB", | |
671 | e - bond->hash, e->tx_bytes / 1024); | |
672 | } | |
673 | ds_put_cstr(&ds, ")"); | |
674 | } | |
675 | } | |
676 | VLOG_DBG("bond %s:%s", bond->name, ds_cstr(&ds)); | |
677 | ds_destroy(&ds); | |
678 | } | |
679 | } | |
680 | ||
681 | /* Shifts 'hash' from its current slave to 'to'. */ | |
682 | static void | |
683 | bond_shift_load(struct bond_entry *hash, struct bond_slave *to, | |
684 | struct tag_set *set) | |
685 | { | |
686 | struct bond_slave *from = hash->slave; | |
687 | struct bond *bond = from->bond; | |
688 | uint64_t delta = hash->tx_bytes; | |
689 | ||
690 | VLOG_INFO("bond %s: shift %"PRIu64"kB of load (with hash %td) " | |
691 | "from %s to %s (now carrying %"PRIu64"kB and " | |
692 | "%"PRIu64"kB load, respectively)", | |
693 | bond->name, delta / 1024, hash - bond->hash, | |
694 | from->name, to->name, | |
695 | (from->tx_bytes - delta) / 1024, | |
696 | (to->tx_bytes + delta) / 1024); | |
697 | ||
698 | /* Shift load away from 'from' to 'to'. */ | |
699 | from->tx_bytes -= delta; | |
700 | to->tx_bytes += delta; | |
701 | ||
702 | /* Arrange for flows to be revalidated. */ | |
703 | tag_set_add(set, hash->tag); | |
704 | hash->slave = to; | |
705 | hash->tag = tag_create_random(); | |
706 | } | |
707 | ||
708 | /* Pick and returns a bond_entry to migrate to 'to' (the least-loaded slave), | |
709 | * given that doing so must decrease the ratio of the load on the two slaves by | |
710 | * at least 0.1. Returns NULL if there is no appropriate entry. | |
711 | * | |
712 | * The list of entries isn't sorted. I don't know of a reason to prefer to | |
713 | * shift away small hashes or large hashes. */ | |
714 | static struct bond_entry * | |
715 | choose_entry_to_migrate(const struct bond_slave *from, uint64_t to_tx_bytes) | |
716 | { | |
717 | struct bond_entry *e; | |
718 | ||
719 | if (list_is_short(&from->entries)) { | |
720 | /* 'from' carries no more than one MAC hash, so shifting load away from | |
721 | * it would be pointless. */ | |
722 | return NULL; | |
723 | } | |
724 | ||
725 | LIST_FOR_EACH (e, list_node, &from->entries) { | |
726 | double old_ratio, new_ratio; | |
727 | uint64_t delta; | |
728 | ||
729 | if (to_tx_bytes == 0) { | |
730 | /* Nothing on the new slave, move it. */ | |
731 | return e; | |
732 | } | |
733 | ||
734 | delta = e->tx_bytes; | |
735 | old_ratio = (double)from->tx_bytes / to_tx_bytes; | |
736 | new_ratio = (double)(from->tx_bytes - delta) / (to_tx_bytes + delta); | |
737 | if (old_ratio - new_ratio > 0.1) { | |
738 | /* Would decrease the ratio, move it. */ | |
739 | return e; | |
740 | } | |
741 | } | |
742 | ||
743 | return NULL; | |
744 | } | |
745 | ||
746 | /* Inserts 'slave' into 'bals' so that descending order of 'tx_bytes' is | |
747 | * maintained. */ | |
748 | static void | |
749 | insert_bal(struct list *bals, struct bond_slave *slave) | |
750 | { | |
751 | struct bond_slave *pos; | |
752 | ||
753 | LIST_FOR_EACH (pos, bal_node, bals) { | |
754 | if (slave->tx_bytes > pos->tx_bytes) { | |
755 | break; | |
756 | } | |
757 | } | |
758 | list_insert(&pos->bal_node, &slave->bal_node); | |
759 | } | |
760 | ||
761 | /* Removes 'slave' from its current list and then inserts it into 'bals' so | |
762 | * that descending order of 'tx_bytes' is maintained. */ | |
763 | static void | |
764 | reinsert_bal(struct list *bals, struct bond_slave *slave) | |
765 | { | |
766 | list_remove(&slave->bal_node); | |
767 | insert_bal(bals, slave); | |
768 | } | |
769 | ||
770 | /* If 'bond' needs rebalancing, does so. | |
771 | * | |
772 | * The caller should have called bond_account() for each active flow, to ensure | |
773 | * that flow data is consistently accounted at this point. */ | |
774 | void | |
775 | bond_rebalance(struct bond *bond, struct tag_set *tags) | |
776 | { | |
777 | struct bond_slave *slave; | |
778 | struct bond_entry *e; | |
779 | struct list bals; | |
780 | ||
1b137691 | 781 | if (!bond_is_balanced(bond) || time_msec() < bond->next_rebalance) { |
f620b43a BP |
782 | return; |
783 | } | |
784 | bond->next_rebalance = time_msec() + bond->rebalance_interval; | |
785 | ||
786 | /* Add each bond_entry to its slave's 'entries' list. | |
787 | * Compute each slave's tx_bytes as the sum of its entries' tx_bytes. */ | |
788 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
789 | slave->tx_bytes = 0; | |
790 | list_init(&slave->entries); | |
791 | } | |
792 | for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) { | |
793 | if (e->slave && e->tx_bytes) { | |
794 | e->slave->tx_bytes += e->tx_bytes; | |
795 | list_push_back(&e->slave->entries, &e->list_node); | |
796 | } | |
797 | } | |
798 | ||
799 | /* Add enabled slaves to 'bals' in descending order of tx_bytes. | |
800 | * | |
801 | * XXX This is O(n**2) in the number of slaves but it could be O(n lg n) | |
802 | * with a proper list sort algorithm. */ | |
803 | list_init(&bals); | |
804 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
805 | if (slave->enabled) { | |
806 | insert_bal(&bals, slave); | |
807 | } | |
808 | } | |
809 | log_bals(bond, &bals); | |
810 | ||
811 | /* Shift load from the most-loaded slaves to the least-loaded slaves. */ | |
812 | while (!list_is_short(&bals)) { | |
813 | struct bond_slave *from = bond_slave_from_bal_node(list_front(&bals)); | |
814 | struct bond_slave *to = bond_slave_from_bal_node(list_back(&bals)); | |
815 | uint64_t overload; | |
816 | ||
817 | overload = from->tx_bytes - to->tx_bytes; | |
818 | if (overload < to->tx_bytes >> 5 || overload < 100000) { | |
819 | /* The extra load on 'from' (and all less-loaded slaves), compared | |
820 | * to that of 'to' (the least-loaded slave), is less than ~3%, or | |
821 | * it is less than ~1Mbps. No point in rebalancing. */ | |
822 | break; | |
823 | } | |
824 | ||
825 | /* 'from' is carrying significantly more load than 'to', and that load | |
826 | * is split across at least two different hashes. */ | |
827 | e = choose_entry_to_migrate(from, to->tx_bytes); | |
828 | if (e) { | |
829 | bond_shift_load(e, to, tags); | |
830 | ||
831 | /* Delete element from from->entries. | |
832 | * | |
833 | * We don't add the element to to->hashes. That would only allow | |
834 | * 'e' to be migrated to another slave in this rebalancing run, and | |
835 | * there is no point in doing that. */ | |
836 | list_remove(&e->list_node); | |
837 | ||
838 | /* Re-sort 'bals'. */ | |
839 | reinsert_bal(&bals, from); | |
840 | reinsert_bal(&bals, to); | |
841 | } else { | |
842 | /* Can't usefully migrate anything away from 'from'. | |
843 | * Don't reconsider it. */ | |
844 | list_remove(&from->bal_node); | |
845 | } | |
846 | } | |
847 | ||
848 | /* Implement exponentially weighted moving average. A weight of 1/2 causes | |
849 | * historical data to decay to <1% in 7 rebalancing runs. 1,000,000 bytes | |
850 | * take 20 rebalancing runs to decay to 0 and get deleted entirely. */ | |
851 | for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) { | |
852 | e->tx_bytes /= 2; | |
853 | if (!e->tx_bytes) { | |
854 | e->slave = NULL; | |
855 | } | |
856 | } | |
857 | } | |
858 | \f | |
859 | /* Bonding unixctl user interface functions. */ | |
860 | ||
861 | static struct bond * | |
862 | bond_find(const char *name) | |
863 | { | |
864 | struct bond *bond; | |
865 | ||
866 | HMAP_FOR_EACH_WITH_HASH (bond, hmap_node, hash_string(name, 0), | |
867 | &all_bonds) { | |
868 | if (!strcmp(bond->name, name)) { | |
869 | return bond; | |
870 | } | |
871 | } | |
872 | return NULL; | |
873 | } | |
874 | ||
875 | static struct bond_slave * | |
876 | bond_lookup_slave(struct bond *bond, const char *slave_name) | |
877 | { | |
878 | struct bond_slave *slave; | |
879 | ||
880 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
881 | if (!strcmp(slave->name, slave_name)) { | |
882 | return slave; | |
883 | } | |
884 | } | |
885 | return NULL; | |
886 | } | |
887 | ||
888 | static void | |
889 | bond_unixctl_list(struct unixctl_conn *conn, | |
890 | const char *args OVS_UNUSED, void *aux OVS_UNUSED) | |
891 | { | |
892 | struct ds ds = DS_EMPTY_INITIALIZER; | |
893 | const struct bond *bond; | |
894 | ||
895 | ds_put_cstr(&ds, "bond\ttype\tslaves\n"); | |
896 | ||
897 | HMAP_FOR_EACH (bond, hmap_node, &all_bonds) { | |
898 | const struct bond_slave *slave; | |
899 | size_t i; | |
900 | ||
901 | ds_put_format(&ds, "%s\t%s\t", | |
902 | bond->name, bond_mode_to_string(bond->balance)); | |
903 | ||
904 | i = 0; | |
905 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
906 | if (i++ > 0) { | |
907 | ds_put_cstr(&ds, ", "); | |
908 | } | |
909 | ds_put_cstr(&ds, slave->name); | |
910 | } | |
911 | ds_put_char(&ds, '\n'); | |
912 | } | |
913 | unixctl_command_reply(conn, 200, ds_cstr(&ds)); | |
914 | ds_destroy(&ds); | |
915 | } | |
916 | ||
917 | static void | |
918 | bond_unixctl_show(struct unixctl_conn *conn, | |
919 | const char *args, void *aux OVS_UNUSED) | |
920 | { | |
921 | struct ds ds = DS_EMPTY_INITIALIZER; | |
922 | const struct bond_slave *slave; | |
923 | const struct bond *bond; | |
924 | ||
925 | bond = bond_find(args); | |
926 | if (!bond) { | |
927 | unixctl_command_reply(conn, 501, "no such bond"); | |
928 | return; | |
929 | } | |
930 | ||
931 | ds_put_format(&ds, "bond_mode: %s\n", | |
932 | bond_mode_to_string(bond->balance)); | |
933 | ||
f620b43a BP |
934 | if (bond->balance != BM_AB) { |
935 | ds_put_format(&ds, "bond-hash-algorithm: %s\n", | |
936 | bond_is_tcp_hash(bond) ? "balance-tcp" : "balance-slb"); | |
937 | } | |
938 | ||
672d18b2 EJ |
939 | ds_put_format(&ds, "bond-hash-basis: %"PRIu32"\n", bond->basis); |
940 | ||
f620b43a BP |
941 | ds_put_format(&ds, "updelay: %d ms\n", bond->updelay); |
942 | ds_put_format(&ds, "downdelay: %d ms\n", bond->downdelay); | |
943 | ||
1b137691 | 944 | if (bond_is_balanced(bond)) { |
f620b43a BP |
945 | ds_put_format(&ds, "next rebalance: %lld ms\n", |
946 | bond->next_rebalance - time_msec()); | |
947 | } | |
948 | ||
4d6fb5eb EJ |
949 | ds_put_format(&ds, "lacp_negotiated: %s\n", |
950 | bond->lacp_negotiated ? "true" : "false"); | |
951 | ||
f620b43a BP |
952 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { |
953 | struct bond_entry *be; | |
f620b43a BP |
954 | |
955 | /* Basic info. */ | |
956 | ds_put_format(&ds, "\nslave %s: %s\n", | |
957 | slave->name, slave->enabled ? "enabled" : "disabled"); | |
958 | if (slave == bond->active_slave) { | |
959 | ds_put_cstr(&ds, "\tactive slave\n"); | |
960 | } | |
961 | if (slave->delay_expires != LLONG_MAX) { | |
962 | ds_put_format(&ds, "\t%s expires in %lld ms\n", | |
963 | slave->enabled ? "downdelay" : "updelay", | |
964 | slave->delay_expires - time_msec()); | |
965 | } | |
966 | ||
70f25ec2 | 967 | ds_put_format(&ds, "\tlacp_may_enable: %s\n", |
4d6fb5eb EJ |
968 | slave->lacp_may_enable ? "true" : "false"); |
969 | ||
1b137691 | 970 | if (!bond_is_balanced(bond)) { |
f620b43a BP |
971 | continue; |
972 | } | |
973 | ||
974 | /* Hashes. */ | |
f620b43a BP |
975 | for (be = bond->hash; be <= &bond->hash[BOND_MASK]; be++) { |
976 | int hash = be - bond->hash; | |
977 | ||
978 | if (be->slave != slave) { | |
979 | continue; | |
980 | } | |
981 | ||
982 | ds_put_format(&ds, "\thash %d: %"PRIu64" kB load\n", | |
983 | hash, be->tx_bytes / 1024); | |
984 | ||
985 | if (bond->balance != BM_SLB) { | |
986 | continue; | |
987 | } | |
988 | ||
989 | /* XXX How can we list the MACs assigned to hashes? */ | |
990 | } | |
991 | } | |
992 | unixctl_command_reply(conn, 200, ds_cstr(&ds)); | |
993 | ds_destroy(&ds); | |
994 | } | |
995 | ||
996 | static void | |
997 | bond_unixctl_migrate(struct unixctl_conn *conn, const char *args_, | |
998 | void *aux OVS_UNUSED) | |
999 | { | |
1000 | char *args = (char *) args_; | |
1001 | char *save_ptr = NULL; | |
1002 | char *bond_s, *hash_s, *slave_s; | |
1003 | struct bond *bond; | |
1004 | struct bond_slave *slave; | |
1005 | struct bond_entry *entry; | |
1006 | int hash; | |
1007 | ||
1008 | bond_s = strtok_r(args, " ", &save_ptr); | |
1009 | hash_s = strtok_r(NULL, " ", &save_ptr); | |
1010 | slave_s = strtok_r(NULL, " ", &save_ptr); | |
1011 | if (!slave_s) { | |
1012 | unixctl_command_reply(conn, 501, | |
1013 | "usage: bond/migrate BOND HASH SLAVE"); | |
1014 | return; | |
1015 | } | |
1016 | ||
1017 | bond = bond_find(bond_s); | |
1018 | if (!bond) { | |
1019 | unixctl_command_reply(conn, 501, "no such bond"); | |
1020 | return; | |
1021 | } | |
1022 | ||
1023 | if (bond->balance != BM_SLB) { | |
1024 | unixctl_command_reply(conn, 501, "not an SLB bond"); | |
1025 | return; | |
1026 | } | |
1027 | ||
1028 | if (strspn(hash_s, "0123456789") == strlen(hash_s)) { | |
1029 | hash = atoi(hash_s) & BOND_MASK; | |
1030 | } else { | |
1031 | unixctl_command_reply(conn, 501, "bad hash"); | |
1032 | return; | |
1033 | } | |
1034 | ||
1035 | slave = bond_lookup_slave(bond, slave_s); | |
1036 | if (!slave) { | |
1037 | unixctl_command_reply(conn, 501, "no such slave"); | |
1038 | return; | |
1039 | } | |
1040 | ||
1041 | if (!slave->enabled) { | |
1042 | unixctl_command_reply(conn, 501, "cannot migrate to disabled slave"); | |
1043 | return; | |
1044 | } | |
1045 | ||
1046 | entry = &bond->hash[hash]; | |
1047 | tag_set_add(&bond->unixctl_tags, entry->tag); | |
1048 | entry->slave = slave; | |
1049 | entry->tag = tag_create_random(); | |
1050 | unixctl_command_reply(conn, 200, "migrated"); | |
1051 | } | |
1052 | ||
1053 | static void | |
1054 | bond_unixctl_set_active_slave(struct unixctl_conn *conn, const char *args_, | |
1055 | void *aux OVS_UNUSED) | |
1056 | { | |
1057 | char *args = (char *) args_; | |
1058 | char *save_ptr = NULL; | |
1059 | char *bond_s, *slave_s; | |
1060 | struct bond *bond; | |
1061 | struct bond_slave *slave; | |
1062 | ||
1063 | bond_s = strtok_r(args, " ", &save_ptr); | |
1064 | slave_s = strtok_r(NULL, " ", &save_ptr); | |
1065 | if (!slave_s) { | |
1066 | unixctl_command_reply(conn, 501, | |
1067 | "usage: bond/set-active-slave BOND SLAVE"); | |
1068 | return; | |
1069 | } | |
1070 | ||
1071 | bond = bond_find(bond_s); | |
1072 | if (!bond) { | |
1073 | unixctl_command_reply(conn, 501, "no such bond"); | |
1074 | return; | |
1075 | } | |
1076 | ||
1077 | slave = bond_lookup_slave(bond, slave_s); | |
1078 | if (!slave) { | |
1079 | unixctl_command_reply(conn, 501, "no such slave"); | |
1080 | return; | |
1081 | } | |
1082 | ||
1083 | if (!slave->enabled) { | |
1084 | unixctl_command_reply(conn, 501, "cannot make disabled slave active"); | |
1085 | return; | |
1086 | } | |
1087 | ||
1088 | if (bond->active_slave != slave) { | |
1089 | tag_set_add(&bond->unixctl_tags, bond_get_active_slave_tag(bond)); | |
1090 | bond->active_slave = slave; | |
1091 | bond->active_slave->tag = tag_create_random(); | |
1092 | VLOG_INFO("bond %s: active interface is now %s", | |
1093 | bond->name, slave->name); | |
1094 | bond->send_learning_packets = true; | |
1095 | unixctl_command_reply(conn, 200, "done"); | |
1096 | } else { | |
1097 | unixctl_command_reply(conn, 200, "no change"); | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | static void | |
1102 | enable_slave(struct unixctl_conn *conn, const char *args_, bool enable) | |
1103 | { | |
1104 | char *args = (char *) args_; | |
1105 | char *save_ptr = NULL; | |
1106 | char *bond_s, *slave_s; | |
1107 | struct bond *bond; | |
1108 | struct bond_slave *slave; | |
1109 | ||
1110 | bond_s = strtok_r(args, " ", &save_ptr); | |
1111 | slave_s = strtok_r(NULL, " ", &save_ptr); | |
1112 | if (!slave_s) { | |
1113 | char *usage = xasprintf("usage: bond/%s-slave BOND SLAVE", | |
1114 | enable ? "enable" : "disable"); | |
1115 | unixctl_command_reply(conn, 501, usage); | |
1116 | free(usage); | |
1117 | return; | |
1118 | } | |
1119 | ||
1120 | bond = bond_find(bond_s); | |
1121 | if (!bond) { | |
1122 | unixctl_command_reply(conn, 501, "no such bond"); | |
1123 | return; | |
1124 | } | |
1125 | ||
1126 | slave = bond_lookup_slave(bond, slave_s); | |
1127 | if (!slave) { | |
1128 | unixctl_command_reply(conn, 501, "no such slave"); | |
1129 | return; | |
1130 | } | |
1131 | ||
1132 | bond_enable_slave(slave, enable, &bond->unixctl_tags); | |
1133 | unixctl_command_reply(conn, 501, enable ? "enabled" : "disabled"); | |
1134 | } | |
1135 | ||
1136 | static void | |
1137 | bond_unixctl_enable_slave(struct unixctl_conn *conn, const char *args, | |
1138 | void *aux OVS_UNUSED) | |
1139 | { | |
1140 | enable_slave(conn, args, true); | |
1141 | } | |
1142 | ||
1143 | static void | |
1144 | bond_unixctl_disable_slave(struct unixctl_conn *conn, const char *args, | |
1145 | void *aux OVS_UNUSED) | |
1146 | { | |
1147 | enable_slave(conn, args, false); | |
1148 | } | |
1149 | ||
1150 | static void | |
1151 | bond_unixctl_hash(struct unixctl_conn *conn, const char *args_, | |
1152 | void *aux OVS_UNUSED) | |
1153 | { | |
1154 | char *args = (char *) args_; | |
1155 | uint8_t mac[ETH_ADDR_LEN]; | |
1156 | uint8_t hash; | |
1157 | char *hash_cstr; | |
1158 | unsigned int vlan; | |
672d18b2 EJ |
1159 | uint32_t basis; |
1160 | char *mac_s, *vlan_s, *basis_s; | |
f620b43a BP |
1161 | char *save_ptr = NULL; |
1162 | ||
1163 | mac_s = strtok_r(args, " ", &save_ptr); | |
1164 | vlan_s = strtok_r(NULL, " ", &save_ptr); | |
672d18b2 | 1165 | basis_s = strtok_r(NULL, " ", &save_ptr); |
f620b43a BP |
1166 | |
1167 | if (vlan_s) { | |
1168 | if (sscanf(vlan_s, "%u", &vlan) != 1) { | |
1169 | unixctl_command_reply(conn, 501, "invalid vlan"); | |
1170 | return; | |
1171 | } | |
1172 | } else { | |
1173 | vlan = OFP_VLAN_NONE; | |
1174 | } | |
1175 | ||
672d18b2 EJ |
1176 | if (basis_s) { |
1177 | if (sscanf(basis_s, "%"PRIu32, &basis) != 1) { | |
1178 | unixctl_command_reply(conn, 501, "invalid basis"); | |
1179 | return; | |
1180 | } | |
1181 | } else { | |
1182 | basis = 0; | |
1183 | } | |
1184 | ||
f620b43a BP |
1185 | if (sscanf(mac_s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac)) |
1186 | == ETH_ADDR_SCAN_COUNT) { | |
672d18b2 | 1187 | hash = bond_hash_src(mac, vlan, basis) & BOND_MASK; |
f620b43a BP |
1188 | |
1189 | hash_cstr = xasprintf("%u", hash); | |
1190 | unixctl_command_reply(conn, 200, hash_cstr); | |
1191 | free(hash_cstr); | |
1192 | } else { | |
1193 | unixctl_command_reply(conn, 501, "invalid mac"); | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | void | |
1198 | bond_init(void) | |
1199 | { | |
f620b43a BP |
1200 | unixctl_command_register("bond/list", bond_unixctl_list, NULL); |
1201 | unixctl_command_register("bond/show", bond_unixctl_show, NULL); | |
1202 | unixctl_command_register("bond/migrate", bond_unixctl_migrate, NULL); | |
1203 | unixctl_command_register("bond/set-active-slave", | |
1204 | bond_unixctl_set_active_slave, NULL); | |
1205 | unixctl_command_register("bond/enable-slave", bond_unixctl_enable_slave, | |
1206 | NULL); | |
1207 | unixctl_command_register("bond/disable-slave", bond_unixctl_disable_slave, | |
1208 | NULL); | |
1209 | unixctl_command_register("bond/hash", bond_unixctl_hash, NULL); | |
1210 | } | |
1211 | \f | |
95aafb2a EJ |
1212 | static void |
1213 | bond_entry_reset(struct bond *bond) | |
1214 | { | |
1215 | if (bond->balance != BM_AB) { | |
1216 | size_t hash_len = (BOND_MASK + 1) * sizeof *bond->hash; | |
1217 | ||
1218 | if (!bond->hash) { | |
1219 | bond->hash = xmalloc(hash_len); | |
1220 | } | |
1221 | memset(bond->hash, 0, hash_len); | |
1222 | ||
1223 | bond->next_rebalance = time_msec() + bond->rebalance_interval; | |
1224 | } else { | |
1225 | free(bond->hash); | |
1226 | bond->hash = NULL; | |
1227 | } | |
1228 | } | |
1229 | ||
f620b43a BP |
1230 | static struct bond_slave * |
1231 | bond_slave_lookup(struct bond *bond, const void *slave_) | |
1232 | { | |
1233 | struct bond_slave *slave; | |
1234 | ||
1235 | HMAP_FOR_EACH_IN_BUCKET (slave, hmap_node, hash_pointer(slave_, 0), | |
1236 | &bond->slaves) { | |
1237 | if (slave->aux == slave_) { | |
1238 | return slave; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | return NULL; | |
1243 | } | |
1244 | ||
f620b43a BP |
1245 | static void |
1246 | bond_enable_slave(struct bond_slave *slave, bool enable, struct tag_set *tags) | |
1247 | { | |
7321e30e | 1248 | struct bond *bond = slave->bond; |
f620b43a BP |
1249 | slave->delay_expires = LLONG_MAX; |
1250 | if (enable != slave->enabled) { | |
1251 | slave->enabled = enable; | |
1252 | if (!slave->enabled) { | |
1253 | VLOG_WARN("interface %s: disabled", slave->name); | |
b3c18f66 EJ |
1254 | if (tags) { |
1255 | tag_set_add(tags, slave->tag); | |
1256 | } | |
f620b43a BP |
1257 | } else { |
1258 | VLOG_WARN("interface %s: enabled", slave->name); | |
1259 | slave->tag = tag_create_random(); | |
1260 | } | |
7321e30e EJ |
1261 | |
1262 | if (bond->balance == BM_STABLE) { | |
1263 | bond->bond_revalidate = true; | |
1264 | } | |
f620b43a BP |
1265 | } |
1266 | } | |
1267 | ||
1268 | static void | |
1269 | bond_link_status_update(struct bond_slave *slave, struct tag_set *tags) | |
1270 | { | |
1271 | struct bond *bond = slave->bond; | |
1272 | bool up; | |
1273 | ||
c8544aa1 | 1274 | up = netdev_get_carrier(slave->netdev) && slave->lacp_may_enable; |
f620b43a BP |
1275 | if ((up == slave->enabled) != (slave->delay_expires == LLONG_MAX)) { |
1276 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
1277 | VLOG_INFO_RL(&rl, "interface %s: link state %s", | |
1278 | slave->name, up ? "up" : "down"); | |
1279 | if (up == slave->enabled) { | |
1280 | slave->delay_expires = LLONG_MAX; | |
1281 | VLOG_INFO_RL(&rl, "interface %s: will not be %s", | |
1282 | slave->name, up ? "disabled" : "enabled"); | |
1283 | } else { | |
4d6fb5eb | 1284 | int delay = (bond->lacp_negotiated ? 0 |
f620b43a BP |
1285 | : up ? bond->updelay : bond->downdelay); |
1286 | slave->delay_expires = time_msec() + delay; | |
1287 | if (delay) { | |
1288 | VLOG_INFO_RL(&rl, "interface %s: will be %s if it stays %s " | |
1289 | "for %d ms", | |
1290 | slave->name, | |
1291 | up ? "enabled" : "disabled", | |
1292 | up ? "up" : "down", | |
1293 | delay); | |
1294 | } | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | if (time_msec() >= slave->delay_expires) { | |
1299 | bond_enable_slave(slave, up, tags); | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | static bool | |
1304 | bond_is_tcp_hash(const struct bond *bond) | |
1305 | { | |
fb0b29a3 | 1306 | return (bond->balance == BM_TCP || bond->balance == BM_STABLE) |
4d6fb5eb | 1307 | && bond->lacp_negotiated; |
f620b43a BP |
1308 | } |
1309 | ||
1310 | static unsigned int | |
672d18b2 | 1311 | bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan, uint32_t basis) |
f620b43a | 1312 | { |
672d18b2 | 1313 | return hash_3words(hash_bytes(mac, ETH_ADDR_LEN, 0), vlan, basis); |
f620b43a BP |
1314 | } |
1315 | ||
1316 | static unsigned int | |
672d18b2 | 1317 | bond_hash_tcp(const struct flow *flow, uint16_t vlan, uint32_t basis) |
f620b43a BP |
1318 | { |
1319 | struct flow hash_flow = *flow; | |
d84d4b88 | 1320 | hash_flow.vlan_tci = htons(vlan); |
f620b43a BP |
1321 | |
1322 | /* The symmetric quality of this hash function is not required, but | |
1323 | * flow_hash_symmetric_l4 already exists, and is sufficient for our | |
1324 | * purposes, so we use it out of convenience. */ | |
672d18b2 | 1325 | return flow_hash_symmetric_l4(&hash_flow, basis); |
f620b43a BP |
1326 | } |
1327 | ||
fb0b29a3 EJ |
1328 | static unsigned int |
1329 | bond_hash(const struct bond *bond, const struct flow *flow, uint16_t vlan) | |
1330 | { | |
1331 | assert(bond->balance != BM_AB); | |
1332 | ||
1333 | return (bond_is_tcp_hash(bond) | |
672d18b2 EJ |
1334 | ? bond_hash_tcp(flow, vlan, bond->basis) |
1335 | : bond_hash_src(flow->dl_src, vlan, bond->basis)); | |
fb0b29a3 EJ |
1336 | } |
1337 | ||
f620b43a BP |
1338 | static struct bond_entry * |
1339 | lookup_bond_entry(const struct bond *bond, const struct flow *flow, | |
1340 | uint16_t vlan) | |
1341 | { | |
fb0b29a3 | 1342 | return &bond->hash[bond_hash(bond, flow, vlan) & BOND_MASK]; |
f620b43a BP |
1343 | } |
1344 | ||
7321e30e EJ |
1345 | /* This function uses Highest Random Weight hashing to choose an output slave. |
1346 | * This approach only reassigns a minimal number of flows when slaves are | |
1347 | * enabled or disabled. Unfortunately, it has O(n) performance against the | |
1348 | * number of slaves. There exist algorithms which are O(1), but have slightly | |
1349 | * more complex implementations and require the use of memory. This may need | |
1350 | * to be reimplemented if it becomes a performance bottleneck. */ | |
1351 | static struct bond_slave * | |
1352 | choose_stb_slave(const struct bond *bond, const struct flow *flow, | |
1353 | uint16_t vlan) | |
1354 | { | |
1355 | struct bond_slave *best, *slave; | |
1356 | uint32_t best_hash, flow_hash; | |
1357 | ||
1358 | best = NULL; | |
1359 | best_hash = 0; | |
1360 | flow_hash = bond_hash(bond, flow, vlan); | |
1361 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1362 | if (slave->enabled) { | |
1363 | uint32_t hash; | |
1364 | ||
1365 | hash = hash_2words(flow_hash, slave->stb_id); | |
1366 | if (!best || hash > best_hash) { | |
1367 | best = slave; | |
1368 | best_hash = hash; | |
1369 | } | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | return best; | |
1374 | } | |
1375 | ||
f620b43a BP |
1376 | static struct bond_slave * |
1377 | choose_output_slave(const struct bond *bond, const struct flow *flow, | |
1378 | uint16_t vlan) | |
1379 | { | |
1380 | struct bond_entry *e; | |
1381 | ||
1382 | switch (bond->balance) { | |
1383 | case BM_AB: | |
1384 | return bond->active_slave; | |
1385 | ||
fb0b29a3 | 1386 | case BM_STABLE: |
7321e30e | 1387 | return choose_stb_slave(bond, flow, vlan); |
f620b43a BP |
1388 | case BM_SLB: |
1389 | case BM_TCP: | |
1390 | e = lookup_bond_entry(bond, flow, vlan); | |
1391 | if (!e->slave || !e->slave->enabled) { | |
c804cadf EJ |
1392 | e->slave = CONTAINER_OF(hmap_random_node(&bond->slaves), |
1393 | struct bond_slave, hmap_node); | |
1394 | if (!e->slave->enabled) { | |
1395 | e->slave = bond->active_slave; | |
1396 | } | |
f620b43a BP |
1397 | e->tag = tag_create_random(); |
1398 | } | |
1399 | return e->slave; | |
1400 | ||
1401 | default: | |
1402 | NOT_REACHED(); | |
1403 | } | |
1404 | } | |
1405 | ||
1406 | static struct bond_slave * | |
1407 | bond_choose_slave(const struct bond *bond) | |
1408 | { | |
1409 | struct bond_slave *slave, *best; | |
1410 | ||
1411 | /* Find an enabled slave. */ | |
1412 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1413 | if (slave->enabled) { | |
1414 | return slave; | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | /* All interfaces are disabled. Find an interface that will be enabled | |
1419 | * after its updelay expires. */ | |
1420 | best = NULL; | |
1421 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1422 | if (slave->delay_expires != LLONG_MAX | |
4d6fb5eb | 1423 | && slave->lacp_may_enable |
f620b43a BP |
1424 | && (!best || slave->delay_expires < best->delay_expires)) { |
1425 | best = slave; | |
1426 | } | |
1427 | } | |
1428 | return best; | |
1429 | } | |
1430 | ||
1431 | static void | |
1432 | bond_choose_active_slave(struct bond *bond, struct tag_set *tags) | |
1433 | { | |
1434 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
1435 | struct bond_slave *old_active_slave = bond->active_slave; | |
1436 | ||
1437 | bond->active_slave = bond_choose_slave(bond); | |
1438 | if (bond->active_slave) { | |
1439 | if (bond->active_slave->enabled) { | |
1440 | VLOG_INFO_RL(&rl, "bond %s: active interface is now %s", | |
1441 | bond->name, bond->active_slave->name); | |
1442 | } else { | |
1443 | VLOG_INFO_RL(&rl, "bond %s: active interface is now %s, skipping " | |
1444 | "remaining %lld ms updelay (since no interface was " | |
1445 | "enabled)", bond->name, bond->active_slave->name, | |
1446 | bond->active_slave->delay_expires - time_msec()); | |
1447 | bond_enable_slave(bond->active_slave, true, tags); | |
1448 | } | |
1449 | ||
1450 | if (!old_active_slave) { | |
1451 | tag_set_add(tags, bond->no_slaves_tag); | |
1452 | } | |
1453 | ||
1454 | bond->send_learning_packets = true; | |
1455 | } else if (old_active_slave) { | |
1456 | VLOG_WARN_RL(&rl, "bond %s: all interfaces disabled", bond->name); | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | /* Returns the tag for 'bond''s active slave, or 'bond''s no_slaves_tag if | |
1461 | * there is no active slave. */ | |
1462 | static tag_type | |
1463 | bond_get_active_slave_tag(const struct bond *bond) | |
1464 | { | |
1465 | return (bond->active_slave | |
1466 | ? bond->active_slave->tag | |
1467 | : bond->no_slaves_tag); | |
1468 | } | |
1469 | ||
1470 | /* Attempts to make the sum of the bond slaves' statistics appear on the fake | |
1471 | * bond interface. */ | |
1472 | static void | |
1473 | bond_update_fake_slave_stats(struct bond *bond) | |
1474 | { | |
1475 | struct netdev_stats bond_stats; | |
1476 | struct bond_slave *slave; | |
1477 | struct netdev *bond_dev; | |
1478 | ||
1479 | memset(&bond_stats, 0, sizeof bond_stats); | |
1480 | ||
1481 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1482 | struct netdev_stats slave_stats; | |
1483 | ||
1484 | if (!netdev_get_stats(slave->netdev, &slave_stats)) { | |
1485 | /* XXX: We swap the stats here because they are swapped back when | |
1486 | * reported by the internal device. The reason for this is | |
1487 | * internal devices normally represent packets going into the | |
1488 | * system but when used as fake bond device they represent packets | |
1489 | * leaving the system. We really should do this in the internal | |
1490 | * device itself because changing it here reverses the counts from | |
1491 | * the perspective of the switch. However, the internal device | |
1492 | * doesn't know what type of device it represents so we have to do | |
1493 | * it here for now. */ | |
1494 | bond_stats.tx_packets += slave_stats.rx_packets; | |
1495 | bond_stats.tx_bytes += slave_stats.rx_bytes; | |
1496 | bond_stats.rx_packets += slave_stats.tx_packets; | |
1497 | bond_stats.rx_bytes += slave_stats.tx_bytes; | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | if (!netdev_open_default(bond->name, &bond_dev)) { | |
1502 | netdev_set_stats(bond_dev, &bond_stats); | |
1503 | netdev_close(bond_dev); | |
1504 | } | |
1505 | } |