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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. */ | |
66 | bool up; /* Last link status read from netdev. */ | |
67 | bool enabled; /* May be chosen for flows? */ | |
4d6fb5eb | 68 | bool lacp_may_enable; /* LACP considers this interface bondable. */ |
f620b43a BP |
69 | tag_type tag; /* Tag associated with this slave. */ |
70 | ||
71 | /* Rebalancing info. Used only by bond_rebalance(). */ | |
72 | struct list bal_node; /* In bond_rebalance()'s 'bals' list. */ | |
73 | struct list entries; /* 'struct bond_entry's assigned here. */ | |
74 | uint64_t tx_bytes; /* Sum across 'tx_bytes' of entries. */ | |
fb0b29a3 EJ |
75 | |
76 | /* BM_STABLE specific bonding info. */ | |
e1e90548 | 77 | uint16_t stb_id; /* ID used for 'stb_slaves' ordering. */ |
f620b43a BP |
78 | }; |
79 | ||
80 | /* A bond, that is, a set of network devices grouped to improve performance or | |
81 | * robustness. */ | |
82 | struct bond { | |
83 | struct hmap_node hmap_node; /* In 'all_bonds' hmap. */ | |
84 | char *name; /* Name provided by client. */ | |
85 | ||
86 | /* Slaves. */ | |
87 | struct hmap slaves; | |
88 | ||
89 | /* Bonding info. */ | |
90 | enum bond_mode balance; /* Balancing mode, one of BM_*. */ | |
91 | struct bond_slave *active_slave; | |
92 | tag_type no_slaves_tag; /* Tag for flows when all slaves disabled. */ | |
93 | int updelay, downdelay; /* Delay before slave goes up/down, in ms. */ | |
4d6fb5eb | 94 | bool lacp_negotiated; /* LACP negotiations were successful. */ |
62904702 | 95 | bool bond_revalidate; /* True if flows need revalidation. */ |
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. */ | |
107 | enum bond_detect_mode detect; /* Link status mode, one of BLSM_*. */ | |
108 | struct netdev_monitor *monitor; /* detect == BLSM_CARRIER only. */ | |
109 | long long int miimon_interval; /* Miimon status refresh interval. */ | |
110 | long long int miimon_next_update; /* Time of next miimon update. */ | |
111 | ||
112 | /* Legacy compatibility. */ | |
113 | long long int next_fake_iface_update; /* LLONG_MAX if disabled. */ | |
114 | ||
115 | /* Tag set saved for next bond_run(). This tag set is a kluge for cases | |
116 | * where we can't otherwise provide revalidation feedback to the client. | |
117 | * That's only unixctl commands now; I hope no other cases will arise. */ | |
118 | struct tag_set unixctl_tags; | |
119 | }; | |
120 | ||
121 | static struct hmap all_bonds = HMAP_INITIALIZER(&all_bonds); | |
122 | ||
95aafb2a | 123 | static void bond_entry_reset(struct bond *); |
f620b43a BP |
124 | static struct bond_slave *bond_slave_lookup(struct bond *, const void *slave_); |
125 | static bool bond_is_link_up(struct bond *, struct netdev *); | |
126 | static void bond_enable_slave(struct bond_slave *, bool enable, | |
127 | struct tag_set *); | |
128 | static void bond_link_status_update(struct bond_slave *, struct tag_set *); | |
129 | static void bond_choose_active_slave(struct bond *, struct tag_set *); | |
130 | static bool bond_is_tcp_hash(const struct bond *); | |
131 | static unsigned int bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], | |
132 | uint16_t vlan); | |
133 | static unsigned int bond_hash_tcp(const struct flow *, uint16_t vlan); | |
134 | static struct bond_entry *lookup_bond_entry(const struct bond *, | |
135 | const struct flow *, | |
136 | uint16_t vlan); | |
137 | static tag_type bond_get_active_slave_tag(const struct bond *); | |
138 | static struct bond_slave *choose_output_slave(const struct bond *, | |
139 | const struct flow *, | |
140 | uint16_t vlan); | |
141 | static void bond_update_fake_slave_stats(struct bond *); | |
142 | ||
143 | /* Attempts to parse 's' as the name of a bond balancing mode. If successful, | |
144 | * stores the mode in '*balance' and returns true. Otherwise returns false | |
145 | * without modifying '*balance'. */ | |
146 | bool | |
147 | bond_mode_from_string(enum bond_mode *balance, const char *s) | |
148 | { | |
149 | if (!strcmp(s, bond_mode_to_string(BM_TCP))) { | |
150 | *balance = BM_TCP; | |
151 | } else if (!strcmp(s, bond_mode_to_string(BM_SLB))) { | |
152 | *balance = BM_SLB; | |
fb0b29a3 EJ |
153 | } else if (!strcmp(s, bond_mode_to_string(BM_STABLE))) { |
154 | *balance = BM_STABLE; | |
f620b43a BP |
155 | } else if (!strcmp(s, bond_mode_to_string(BM_AB))) { |
156 | *balance = BM_AB; | |
157 | } else { | |
158 | return false; | |
159 | } | |
160 | return true; | |
161 | } | |
162 | ||
163 | /* Returns a string representing 'balance'. */ | |
164 | const char * | |
165 | bond_mode_to_string(enum bond_mode balance) { | |
166 | switch (balance) { | |
167 | case BM_TCP: | |
168 | return "balance-tcp"; | |
169 | case BM_SLB: | |
170 | return "balance-slb"; | |
fb0b29a3 EJ |
171 | case BM_STABLE: |
172 | return "stable"; | |
f620b43a BP |
173 | case BM_AB: |
174 | return "active-backup"; | |
175 | } | |
176 | NOT_REACHED(); | |
177 | } | |
178 | ||
179 | /* Attempts to parse 's' as the name of a bond link status detection mode. If | |
180 | * successful, stores the mode in '*detect' and returns true. Otherwise | |
181 | * returns false without modifying '*detect'. */ | |
182 | bool | |
183 | bond_detect_mode_from_string(enum bond_detect_mode *detect, const char *s) | |
184 | { | |
185 | if (!strcmp(s, bond_detect_mode_to_string(BLSM_CARRIER))) { | |
186 | *detect = BLSM_CARRIER; | |
187 | } else if (!strcmp(s, bond_detect_mode_to_string(BLSM_MIIMON))) { | |
188 | *detect = BLSM_MIIMON; | |
189 | } else { | |
190 | return false; | |
191 | } | |
192 | return true; | |
193 | } | |
194 | ||
195 | /* Returns a string representing 'detect'. */ | |
196 | const char * | |
197 | bond_detect_mode_to_string(enum bond_detect_mode detect) | |
198 | { | |
199 | switch (detect) { | |
200 | case BLSM_CARRIER: | |
201 | return "carrier"; | |
202 | case BLSM_MIIMON: | |
203 | return "miimon"; | |
204 | } | |
205 | NOT_REACHED(); | |
206 | } | |
207 | \f | |
208 | /* Creates and returns a new bond whose configuration is initially taken from | |
209 | * 's'. | |
210 | * | |
211 | * The caller should register each slave on the new bond by calling | |
212 | * bond_slave_register(). */ | |
213 | struct bond * | |
214 | bond_create(const struct bond_settings *s) | |
215 | { | |
216 | struct bond *bond; | |
217 | ||
218 | bond = xzalloc(sizeof *bond); | |
219 | hmap_init(&bond->slaves); | |
220 | bond->no_slaves_tag = tag_create_random(); | |
7321e30e | 221 | bond->stb_tag = tag_create_random(); |
f620b43a BP |
222 | bond->miimon_next_update = LLONG_MAX; |
223 | bond->next_fake_iface_update = LLONG_MAX; | |
224 | ||
225 | bond_reconfigure(bond, s); | |
226 | ||
227 | tag_set_init(&bond->unixctl_tags); | |
228 | ||
229 | return bond; | |
230 | } | |
231 | ||
232 | /* Frees 'bond'. */ | |
233 | void | |
234 | bond_destroy(struct bond *bond) | |
235 | { | |
236 | struct bond_slave *slave, *next_slave; | |
237 | ||
238 | if (!bond) { | |
239 | return; | |
240 | } | |
241 | ||
242 | hmap_remove(&all_bonds, &bond->hmap_node); | |
243 | ||
244 | HMAP_FOR_EACH_SAFE (slave, next_slave, hmap_node, &bond->slaves) { | |
245 | hmap_remove(&bond->slaves, &slave->hmap_node); | |
246 | /* Client owns 'slave->netdev'. */ | |
247 | free(slave->name); | |
248 | free(slave); | |
249 | } | |
250 | hmap_destroy(&bond->slaves); | |
251 | ||
252 | free(bond->hash); | |
253 | ||
f620b43a BP |
254 | netdev_monitor_destroy(bond->monitor); |
255 | ||
256 | free(bond->name); | |
257 | free(bond); | |
258 | } | |
259 | ||
260 | /* Updates 'bond''s overall configuration to 's'. | |
261 | * | |
262 | * The caller should register each slave on 'bond' by calling | |
263 | * bond_slave_register(). This is optional if none of the slaves' | |
4d6fb5eb | 264 | * configuration has changed. In any case it can't hurt. |
59d7b2b6 EJ |
265 | * |
266 | * Returns true if the configuration has changed in such a way that requires | |
267 | * flow revalidation. | |
268 | * */ | |
269 | bool | |
f620b43a BP |
270 | bond_reconfigure(struct bond *bond, const struct bond_settings *s) |
271 | { | |
59d7b2b6 EJ |
272 | bool revalidate = false; |
273 | ||
f620b43a BP |
274 | if (!bond->name || strcmp(bond->name, s->name)) { |
275 | if (bond->name) { | |
276 | hmap_remove(&all_bonds, &bond->hmap_node); | |
277 | free(bond->name); | |
278 | } | |
279 | bond->name = xstrdup(s->name); | |
280 | hmap_insert(&all_bonds, &bond->hmap_node, hash_string(bond->name, 0)); | |
281 | } | |
282 | ||
f620b43a BP |
283 | bond->detect = s->detect; |
284 | bond->miimon_interval = s->miimon_interval; | |
285 | bond->updelay = s->up_delay; | |
286 | bond->downdelay = s->down_delay; | |
287 | bond->rebalance_interval = s->rebalance_interval; | |
288 | ||
59d7b2b6 EJ |
289 | if (bond->balance != s->balance) { |
290 | bond->balance = s->balance; | |
291 | revalidate = true; | |
292 | } | |
293 | ||
f620b43a BP |
294 | if (bond->detect == BLSM_CARRIER) { |
295 | struct bond_slave *slave; | |
296 | ||
297 | if (!bond->monitor) { | |
298 | bond->monitor = netdev_monitor_create(); | |
299 | } | |
300 | ||
301 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
302 | netdev_monitor_add(bond->monitor, slave->netdev); | |
303 | } | |
304 | } else { | |
305 | netdev_monitor_destroy(bond->monitor); | |
306 | bond->monitor = NULL; | |
307 | ||
308 | if (bond->miimon_next_update == LLONG_MAX) { | |
309 | bond->miimon_next_update = time_msec() + bond->miimon_interval; | |
310 | } | |
311 | } | |
312 | ||
f620b43a BP |
313 | if (s->fake_iface) { |
314 | if (bond->next_fake_iface_update == LLONG_MAX) { | |
315 | bond->next_fake_iface_update = time_msec(); | |
316 | } | |
317 | } else { | |
318 | bond->next_fake_iface_update = LLONG_MAX; | |
319 | } | |
59d7b2b6 | 320 | |
62904702 EJ |
321 | if (bond->bond_revalidate) { |
322 | revalidate = true; | |
323 | bond->bond_revalidate = false; | |
324 | } | |
325 | ||
95aafb2a EJ |
326 | if (bond->balance == BM_AB || !bond->hash || revalidate) { |
327 | bond_entry_reset(bond); | |
328 | } | |
329 | ||
59d7b2b6 | 330 | return revalidate; |
f620b43a BP |
331 | } |
332 | ||
333 | /* Registers 'slave_' as a slave of 'bond'. The 'slave_' pointer is an | |
334 | * arbitrary client-provided pointer that uniquely identifies a slave within a | |
335 | * bond. If 'slave_' already exists within 'bond' then this function | |
336 | * reconfigures the existing slave. | |
337 | * | |
e1e90548 EJ |
338 | * 'stb_id' is used in BM_STABLE bonds to guarantee consistent slave choices |
339 | * across restarts and distributed vswitch instances. It should be unique per | |
340 | * slave, and preferably consistent across restarts and reconfigurations. | |
341 | * | |
f620b43a BP |
342 | * 'netdev' must be the network device that 'slave_' represents. It is owned |
343 | * by the client, so the client must not close it before either unregistering | |
344 | * 'slave_' or destroying 'bond'. | |
4d6fb5eb | 345 | */ |
f620b43a | 346 | void |
e1e90548 EJ |
347 | bond_slave_register(struct bond *bond, void *slave_, uint16_t stb_id, |
348 | struct netdev *netdev) | |
f620b43a BP |
349 | { |
350 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
351 | ||
352 | if (!slave) { | |
353 | slave = xzalloc(sizeof *slave); | |
354 | ||
355 | hmap_insert(&bond->slaves, &slave->hmap_node, hash_pointer(slave_, 0)); | |
356 | slave->bond = bond; | |
357 | slave->aux = slave_; | |
358 | slave->delay_expires = LLONG_MAX; | |
359 | slave->up = bond_is_link_up(bond, netdev); | |
244b2160 | 360 | slave->name = xstrdup(netdev_get_name(netdev)); |
7321e30e | 361 | bond->bond_revalidate = true; |
244b2160 | 362 | |
b3c18f66 EJ |
363 | slave->enabled = false; |
364 | bond_enable_slave(slave, slave->up, NULL); | |
f620b43a BP |
365 | } |
366 | ||
e1e90548 | 367 | if (slave->stb_id != stb_id) { |
e1e90548 | 368 | slave->stb_id = stb_id; |
7321e30e | 369 | bond->bond_revalidate = true; |
e1e90548 EJ |
370 | } |
371 | ||
a6934aa9 BP |
372 | if (slave->netdev != netdev) { |
373 | if (bond->monitor) { | |
374 | if (slave->netdev) { | |
375 | netdev_monitor_remove(bond->monitor, slave->netdev); | |
376 | } | |
377 | netdev_monitor_add(bond->monitor, netdev); | |
378 | } | |
379 | slave->netdev = netdev; | |
380 | } | |
381 | ||
f620b43a BP |
382 | free(slave->name); |
383 | slave->name = xstrdup(netdev_get_name(netdev)); | |
f620b43a BP |
384 | } |
385 | ||
386 | /* Unregisters 'slave_' from 'bond'. If 'bond' does not contain such a slave | |
387 | * then this function has no effect. | |
388 | * | |
389 | * Unregistering a slave invalidates all flows. */ | |
390 | void | |
391 | bond_slave_unregister(struct bond *bond, const void *slave_) | |
392 | { | |
393 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
394 | bool del_active; | |
395 | ||
396 | if (!slave) { | |
397 | return; | |
398 | } | |
399 | ||
a6934aa9 BP |
400 | if (bond->monitor) { |
401 | netdev_monitor_remove(bond->monitor, slave->netdev); | |
402 | } | |
403 | ||
b3c18f66 EJ |
404 | bond_enable_slave(slave, false, NULL); |
405 | ||
f620b43a BP |
406 | del_active = bond->active_slave == slave; |
407 | if (bond->hash) { | |
408 | struct bond_entry *e; | |
409 | for (e = bond->hash; e <= &bond->hash[BOND_MASK]; e++) { | |
410 | if (e->slave == slave) { | |
411 | e->slave = NULL; | |
412 | } | |
413 | } | |
414 | } | |
415 | ||
416 | free(slave->name); | |
417 | ||
418 | hmap_remove(&bond->slaves, &slave->hmap_node); | |
419 | /* Client owns 'slave->netdev'. */ | |
420 | free(slave); | |
421 | ||
422 | if (del_active) { | |
423 | struct tag_set tags; | |
424 | ||
425 | tag_set_init(&tags); | |
426 | bond_choose_active_slave(bond, &tags); | |
427 | bond->send_learning_packets = true; | |
428 | } | |
429 | } | |
430 | ||
4d6fb5eb EJ |
431 | /* Should be called on each slave in 'bond' before bond_run() to indicate the |
432 | * results of lacp_slave_may_enable() on 'slave_'. */ | |
433 | void | |
434 | bond_slave_set_lacp_may_enable(struct bond *bond, void *slave_, | |
435 | bool may_enable) | |
436 | { | |
437 | bond_slave_lookup(bond, slave_)->lacp_may_enable = may_enable; | |
438 | } | |
439 | ||
f620b43a BP |
440 | /* Performs periodic maintenance on 'bond'. The caller must provide 'tags' to |
441 | * allow tagged flows to be invalidated. | |
442 | * | |
443 | * The caller should check bond_should_send_learning_packets() afterward. */ | |
444 | void | |
4d6fb5eb | 445 | bond_run(struct bond *bond, struct tag_set *tags, bool lacp_negotiated) |
f620b43a BP |
446 | { |
447 | struct bond_slave *slave; | |
dc9908b3 | 448 | bool is_tcp_hash = bond_is_tcp_hash(bond); |
f620b43a | 449 | |
4d6fb5eb EJ |
450 | bond->lacp_negotiated = lacp_negotiated; |
451 | ||
f620b43a BP |
452 | /* Update link status. */ |
453 | if (bond->detect == BLSM_CARRIER | |
454 | || time_msec() >= bond->miimon_next_update) | |
455 | { | |
456 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
457 | slave->up = bond_is_link_up(bond, slave->netdev); | |
458 | } | |
459 | bond->miimon_next_update = time_msec() + bond->miimon_interval; | |
460 | } | |
461 | ||
f620b43a BP |
462 | /* Enable slaves based on link status and LACP feedback. */ |
463 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
464 | bond_link_status_update(slave, tags); | |
465 | } | |
466 | if (!bond->active_slave || !bond->active_slave->enabled) { | |
467 | bond_choose_active_slave(bond, tags); | |
468 | } | |
469 | ||
470 | /* Update fake bond interface stats. */ | |
471 | if (time_msec() >= bond->next_fake_iface_update) { | |
472 | bond_update_fake_slave_stats(bond); | |
473 | bond->next_fake_iface_update = time_msec() + 1000; | |
474 | } | |
475 | ||
62904702 EJ |
476 | if (is_tcp_hash != bond_is_tcp_hash(bond)) { |
477 | bond->bond_revalidate = true; | |
478 | } | |
479 | ||
480 | if (bond->bond_revalidate) { | |
481 | bond->bond_revalidate = false; | |
dc9908b3 | 482 | |
95aafb2a | 483 | bond_entry_reset(bond); |
8bb6f31d EJ |
484 | if (bond->balance != BM_STABLE) { |
485 | struct bond_slave *slave; | |
486 | ||
487 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
488 | tag_set_add(tags, slave->tag); | |
489 | } | |
490 | } else { | |
491 | tag_set_add(tags, bond->stb_tag); | |
dc9908b3 | 492 | } |
0008fbcb | 493 | tag_set_add(tags, bond->no_slaves_tag); |
dc9908b3 EJ |
494 | } |
495 | ||
f620b43a BP |
496 | /* Invalidate any tags required by */ |
497 | tag_set_union(tags, &bond->unixctl_tags); | |
498 | tag_set_init(&bond->unixctl_tags); | |
499 | } | |
500 | ||
501 | /* Causes poll_block() to wake up when 'bond' needs something to be done. */ | |
502 | void | |
503 | bond_wait(struct bond *bond) | |
504 | { | |
505 | struct bond_slave *slave; | |
506 | ||
507 | if (bond->detect == BLSM_CARRIER) { | |
508 | netdev_monitor_poll_wait(bond->monitor); | |
509 | } else { | |
510 | poll_timer_wait_until(bond->miimon_next_update); | |
511 | } | |
512 | ||
513 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
514 | if (slave->delay_expires != LLONG_MAX) { | |
515 | poll_timer_wait_until(slave->delay_expires); | |
516 | } | |
517 | } | |
518 | ||
519 | if (bond->next_fake_iface_update != LLONG_MAX) { | |
520 | poll_timer_wait_until(bond->next_fake_iface_update); | |
521 | } | |
522 | ||
523 | /* Ensure that any saved tags get revalidated right away. */ | |
524 | if (!tag_set_is_empty(&bond->unixctl_tags)) { | |
525 | poll_immediate_wake(); | |
526 | } | |
527 | ||
528 | /* We don't wait for bond->next_rebalance because rebalancing can only run | |
529 | * at a flow account checkpoint. ofproto does checkpointing on its own | |
530 | * schedule and bond_rebalance() gets called afterward, so we'd just be | |
531 | * waking up for no purpose. */ | |
532 | } | |
533 | \f | |
534 | /* MAC learning table interaction. */ | |
535 | ||
536 | static bool | |
537 | may_send_learning_packets(const struct bond *bond) | |
538 | { | |
4d6fb5eb | 539 | return !bond->lacp_negotiated && bond->balance != BM_AB; |
f620b43a BP |
540 | } |
541 | ||
542 | /* Returns true if 'bond' needs the client to send out packets to assist with | |
543 | * MAC learning on 'bond'. If this function returns true, then the client | |
544 | * should iterate through its MAC learning table for the bridge on which 'bond' | |
545 | * is located. For each MAC that has been learned on a port other than 'bond', | |
546 | * it should call bond_send_learning_packet(). | |
547 | * | |
548 | * This function will only return true if 'bond' is in SLB mode and LACP is not | |
549 | * negotiated. Otherwise sending learning packets isn't necessary. | |
550 | * | |
551 | * Calling this function resets the state that it checks. */ | |
552 | bool | |
553 | bond_should_send_learning_packets(struct bond *bond) | |
554 | { | |
555 | bool send = bond->send_learning_packets && may_send_learning_packets(bond); | |
556 | bond->send_learning_packets = false; | |
557 | return send; | |
558 | } | |
559 | ||
560 | /* Sends a gratuitous learning packet on 'bond' from 'eth_src' on 'vlan'. | |
561 | * | |
562 | * See bond_should_send_learning_packets() for description of usage. */ | |
563 | int | |
564 | bond_send_learning_packet(struct bond *bond, | |
565 | const uint8_t eth_src[ETH_ADDR_LEN], | |
566 | uint16_t vlan) | |
567 | { | |
568 | struct bond_slave *slave; | |
569 | struct ofpbuf packet; | |
570 | struct flow flow; | |
571 | int error; | |
572 | ||
573 | assert(may_send_learning_packets(bond)); | |
574 | if (!bond->active_slave) { | |
575 | /* Nowhere to send the learning packet. */ | |
576 | return 0; | |
577 | } | |
578 | ||
579 | memset(&flow, 0, sizeof flow); | |
580 | memcpy(flow.dl_src, eth_src, ETH_ADDR_LEN); | |
581 | slave = choose_output_slave(bond, &flow, vlan); | |
582 | ||
583 | ofpbuf_init(&packet, 0); | |
584 | compose_benign_packet(&packet, "Open vSwitch Bond Failover", 0xf177, | |
585 | eth_src); | |
586 | if (vlan) { | |
587 | eth_set_vlan_tci(&packet, htons(vlan)); | |
588 | } | |
589 | error = netdev_send(slave->netdev, &packet); | |
590 | ofpbuf_uninit(&packet); | |
591 | ||
592 | return error; | |
593 | } | |
594 | \f | |
595 | /* Checks whether a packet that arrived on 'slave_' within 'bond', with an | |
596 | * Ethernet destination address of 'eth_dst', should be admitted. | |
597 | * | |
598 | * The return value is one of the following: | |
599 | * | |
600 | * - BV_ACCEPT: Admit the packet. | |
601 | * | |
602 | * - BV_DROP: Drop the packet. | |
603 | * | |
604 | * - BV_DROP_IF_MOVED: Consult the MAC learning table for the packet's | |
605 | * Ethernet source address and VLAN. If there is none, or if the packet | |
606 | * is on the learned port, then admit the packet. If a different port has | |
607 | * been learned, however, drop the packet (and do not use it for MAC | |
608 | * learning). | |
609 | */ | |
610 | enum bond_verdict | |
611 | bond_check_admissibility(struct bond *bond, const void *slave_, | |
612 | const uint8_t eth_dst[ETH_ADDR_LEN], tag_type *tags) | |
613 | { | |
614 | /* Admit all packets if LACP has been negotiated, because that means that | |
615 | * the remote switch is aware of the bond and will "do the right thing". */ | |
4d6fb5eb | 616 | if (bond->lacp_negotiated) { |
f620b43a BP |
617 | return BV_ACCEPT; |
618 | } | |
619 | ||
620 | /* Drop all multicast packets on inactive slaves. */ | |
621 | if (eth_addr_is_multicast(eth_dst)) { | |
622 | *tags |= bond_get_active_slave_tag(bond); | |
623 | if (bond->active_slave != bond_slave_lookup(bond, slave_)) { | |
624 | return BV_DROP; | |
625 | } | |
626 | } | |
627 | ||
628 | /* Drop all packets for which we have learned a different input port, | |
629 | * because we probably sent the packet on one slave and got it back on the | |
630 | * other. Gratuitous ARP packets are an exception to this rule: the host | |
631 | * has moved to another switch. The exception to the exception is if we | |
632 | * locked the learning table to avoid reflections on bond slaves. */ | |
633 | return BV_DROP_IF_MOVED; | |
634 | } | |
635 | ||
636 | /* Returns the slave (registered on 'bond' by bond_slave_register()) to which | |
637 | * a packet with the given 'flow' and 'vlan' should be forwarded. Returns | |
638 | * NULL if the packet should be dropped because no slaves are enabled. | |
639 | * | |
640 | * 'vlan' is not necessarily the same as 'flow->vlan_tci'. First, 'vlan' | |
641 | * should be a VID only (i.e. excluding the PCP bits). Second, | |
642 | * 'flow->vlan_tci' is the VLAN TCI that appeared on the packet (so it will be | |
643 | * nonzero only for trunk ports), whereas 'vlan' is the logical VLAN that the | |
644 | * packet belongs to (so for an access port it will be the access port's VLAN). | |
645 | * | |
646 | * Adds a tag to '*tags' that associates the flow with the returned slave. | |
647 | */ | |
648 | void * | |
649 | bond_choose_output_slave(struct bond *bond, const struct flow *flow, | |
650 | uint16_t vlan, tag_type *tags) | |
651 | { | |
652 | struct bond_slave *slave = choose_output_slave(bond, flow, vlan); | |
653 | if (slave) { | |
8bb6f31d | 654 | *tags |= bond->balance == BM_STABLE ? bond->stb_tag : slave->tag; |
f620b43a BP |
655 | return slave->aux; |
656 | } else { | |
657 | *tags |= bond->no_slaves_tag; | |
658 | return NULL; | |
659 | } | |
660 | } | |
f620b43a BP |
661 | \f |
662 | /* Rebalancing. */ | |
663 | ||
1b137691 EJ |
664 | static bool |
665 | bond_is_balanced(const struct bond *bond) | |
666 | { | |
667 | return bond->balance == BM_SLB || bond->balance == BM_TCP; | |
668 | } | |
669 | ||
f620b43a BP |
670 | /* Notifies 'bond' that 'n_bytes' bytes were sent in 'flow' within 'vlan'. */ |
671 | void | |
672 | bond_account(struct bond *bond, const struct flow *flow, uint16_t vlan, | |
673 | uint64_t n_bytes) | |
674 | { | |
f620b43a | 675 | |
1b137691 | 676 | if (bond_is_balanced(bond)) { |
f620b43a | 677 | lookup_bond_entry(bond, flow, vlan)->tx_bytes += n_bytes; |
f620b43a BP |
678 | } |
679 | } | |
680 | ||
681 | static struct bond_slave * | |
682 | bond_slave_from_bal_node(struct list *bal) | |
683 | { | |
684 | return CONTAINER_OF(bal, struct bond_slave, bal_node); | |
685 | } | |
686 | ||
687 | static void | |
688 | log_bals(struct bond *bond, const struct list *bals) | |
689 | { | |
690 | if (VLOG_IS_DBG_ENABLED()) { | |
691 | struct ds ds = DS_EMPTY_INITIALIZER; | |
692 | const struct bond_slave *slave; | |
693 | ||
694 | LIST_FOR_EACH (slave, bal_node, bals) { | |
695 | if (ds.length) { | |
696 | ds_put_char(&ds, ','); | |
697 | } | |
698 | ds_put_format(&ds, " %s %"PRIu64"kB", | |
699 | slave->name, slave->tx_bytes / 1024); | |
700 | ||
701 | if (!slave->enabled) { | |
702 | ds_put_cstr(&ds, " (disabled)"); | |
703 | } | |
704 | if (!list_is_empty(&slave->entries)) { | |
705 | struct bond_entry *e; | |
706 | ||
707 | ds_put_cstr(&ds, " ("); | |
708 | LIST_FOR_EACH (e, list_node, &slave->entries) { | |
709 | if (&e->list_node != list_front(&slave->entries)) { | |
710 | ds_put_cstr(&ds, " + "); | |
711 | } | |
712 | ds_put_format(&ds, "h%td: %"PRIu64"kB", | |
713 | e - bond->hash, e->tx_bytes / 1024); | |
714 | } | |
715 | ds_put_cstr(&ds, ")"); | |
716 | } | |
717 | } | |
718 | VLOG_DBG("bond %s:%s", bond->name, ds_cstr(&ds)); | |
719 | ds_destroy(&ds); | |
720 | } | |
721 | } | |
722 | ||
723 | /* Shifts 'hash' from its current slave to 'to'. */ | |
724 | static void | |
725 | bond_shift_load(struct bond_entry *hash, struct bond_slave *to, | |
726 | struct tag_set *set) | |
727 | { | |
728 | struct bond_slave *from = hash->slave; | |
729 | struct bond *bond = from->bond; | |
730 | uint64_t delta = hash->tx_bytes; | |
731 | ||
732 | VLOG_INFO("bond %s: shift %"PRIu64"kB of load (with hash %td) " | |
733 | "from %s to %s (now carrying %"PRIu64"kB and " | |
734 | "%"PRIu64"kB load, respectively)", | |
735 | bond->name, delta / 1024, hash - bond->hash, | |
736 | from->name, to->name, | |
737 | (from->tx_bytes - delta) / 1024, | |
738 | (to->tx_bytes + delta) / 1024); | |
739 | ||
740 | /* Shift load away from 'from' to 'to'. */ | |
741 | from->tx_bytes -= delta; | |
742 | to->tx_bytes += delta; | |
743 | ||
744 | /* Arrange for flows to be revalidated. */ | |
745 | tag_set_add(set, hash->tag); | |
746 | hash->slave = to; | |
747 | hash->tag = tag_create_random(); | |
748 | } | |
749 | ||
750 | /* Pick and returns a bond_entry to migrate to 'to' (the least-loaded slave), | |
751 | * given that doing so must decrease the ratio of the load on the two slaves by | |
752 | * at least 0.1. Returns NULL if there is no appropriate entry. | |
753 | * | |
754 | * The list of entries isn't sorted. I don't know of a reason to prefer to | |
755 | * shift away small hashes or large hashes. */ | |
756 | static struct bond_entry * | |
757 | choose_entry_to_migrate(const struct bond_slave *from, uint64_t to_tx_bytes) | |
758 | { | |
759 | struct bond_entry *e; | |
760 | ||
761 | if (list_is_short(&from->entries)) { | |
762 | /* 'from' carries no more than one MAC hash, so shifting load away from | |
763 | * it would be pointless. */ | |
764 | return NULL; | |
765 | } | |
766 | ||
767 | LIST_FOR_EACH (e, list_node, &from->entries) { | |
768 | double old_ratio, new_ratio; | |
769 | uint64_t delta; | |
770 | ||
771 | if (to_tx_bytes == 0) { | |
772 | /* Nothing on the new slave, move it. */ | |
773 | return e; | |
774 | } | |
775 | ||
776 | delta = e->tx_bytes; | |
777 | old_ratio = (double)from->tx_bytes / to_tx_bytes; | |
778 | new_ratio = (double)(from->tx_bytes - delta) / (to_tx_bytes + delta); | |
779 | if (old_ratio - new_ratio > 0.1) { | |
780 | /* Would decrease the ratio, move it. */ | |
781 | return e; | |
782 | } | |
783 | } | |
784 | ||
785 | return NULL; | |
786 | } | |
787 | ||
788 | /* Inserts 'slave' into 'bals' so that descending order of 'tx_bytes' is | |
789 | * maintained. */ | |
790 | static void | |
791 | insert_bal(struct list *bals, struct bond_slave *slave) | |
792 | { | |
793 | struct bond_slave *pos; | |
794 | ||
795 | LIST_FOR_EACH (pos, bal_node, bals) { | |
796 | if (slave->tx_bytes > pos->tx_bytes) { | |
797 | break; | |
798 | } | |
799 | } | |
800 | list_insert(&pos->bal_node, &slave->bal_node); | |
801 | } | |
802 | ||
803 | /* Removes 'slave' from its current list and then inserts it into 'bals' so | |
804 | * that descending order of 'tx_bytes' is maintained. */ | |
805 | static void | |
806 | reinsert_bal(struct list *bals, struct bond_slave *slave) | |
807 | { | |
808 | list_remove(&slave->bal_node); | |
809 | insert_bal(bals, slave); | |
810 | } | |
811 | ||
812 | /* If 'bond' needs rebalancing, does so. | |
813 | * | |
814 | * The caller should have called bond_account() for each active flow, to ensure | |
815 | * that flow data is consistently accounted at this point. */ | |
816 | void | |
817 | bond_rebalance(struct bond *bond, struct tag_set *tags) | |
818 | { | |
819 | struct bond_slave *slave; | |
820 | struct bond_entry *e; | |
821 | struct list bals; | |
822 | ||
1b137691 | 823 | if (!bond_is_balanced(bond) || time_msec() < bond->next_rebalance) { |
f620b43a BP |
824 | return; |
825 | } | |
826 | bond->next_rebalance = time_msec() + bond->rebalance_interval; | |
827 | ||
828 | /* Add each bond_entry to its slave's 'entries' list. | |
829 | * Compute each slave's tx_bytes as the sum of its entries' tx_bytes. */ | |
830 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
831 | slave->tx_bytes = 0; | |
832 | list_init(&slave->entries); | |
833 | } | |
834 | for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) { | |
835 | if (e->slave && e->tx_bytes) { | |
836 | e->slave->tx_bytes += e->tx_bytes; | |
837 | list_push_back(&e->slave->entries, &e->list_node); | |
838 | } | |
839 | } | |
840 | ||
841 | /* Add enabled slaves to 'bals' in descending order of tx_bytes. | |
842 | * | |
843 | * XXX This is O(n**2) in the number of slaves but it could be O(n lg n) | |
844 | * with a proper list sort algorithm. */ | |
845 | list_init(&bals); | |
846 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
847 | if (slave->enabled) { | |
848 | insert_bal(&bals, slave); | |
849 | } | |
850 | } | |
851 | log_bals(bond, &bals); | |
852 | ||
853 | /* Shift load from the most-loaded slaves to the least-loaded slaves. */ | |
854 | while (!list_is_short(&bals)) { | |
855 | struct bond_slave *from = bond_slave_from_bal_node(list_front(&bals)); | |
856 | struct bond_slave *to = bond_slave_from_bal_node(list_back(&bals)); | |
857 | uint64_t overload; | |
858 | ||
859 | overload = from->tx_bytes - to->tx_bytes; | |
860 | if (overload < to->tx_bytes >> 5 || overload < 100000) { | |
861 | /* The extra load on 'from' (and all less-loaded slaves), compared | |
862 | * to that of 'to' (the least-loaded slave), is less than ~3%, or | |
863 | * it is less than ~1Mbps. No point in rebalancing. */ | |
864 | break; | |
865 | } | |
866 | ||
867 | /* 'from' is carrying significantly more load than 'to', and that load | |
868 | * is split across at least two different hashes. */ | |
869 | e = choose_entry_to_migrate(from, to->tx_bytes); | |
870 | if (e) { | |
871 | bond_shift_load(e, to, tags); | |
872 | ||
873 | /* Delete element from from->entries. | |
874 | * | |
875 | * We don't add the element to to->hashes. That would only allow | |
876 | * 'e' to be migrated to another slave in this rebalancing run, and | |
877 | * there is no point in doing that. */ | |
878 | list_remove(&e->list_node); | |
879 | ||
880 | /* Re-sort 'bals'. */ | |
881 | reinsert_bal(&bals, from); | |
882 | reinsert_bal(&bals, to); | |
883 | } else { | |
884 | /* Can't usefully migrate anything away from 'from'. | |
885 | * Don't reconsider it. */ | |
886 | list_remove(&from->bal_node); | |
887 | } | |
888 | } | |
889 | ||
890 | /* Implement exponentially weighted moving average. A weight of 1/2 causes | |
891 | * historical data to decay to <1% in 7 rebalancing runs. 1,000,000 bytes | |
892 | * take 20 rebalancing runs to decay to 0 and get deleted entirely. */ | |
893 | for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) { | |
894 | e->tx_bytes /= 2; | |
895 | if (!e->tx_bytes) { | |
896 | e->slave = NULL; | |
897 | } | |
898 | } | |
899 | } | |
900 | \f | |
901 | /* Bonding unixctl user interface functions. */ | |
902 | ||
903 | static struct bond * | |
904 | bond_find(const char *name) | |
905 | { | |
906 | struct bond *bond; | |
907 | ||
908 | HMAP_FOR_EACH_WITH_HASH (bond, hmap_node, hash_string(name, 0), | |
909 | &all_bonds) { | |
910 | if (!strcmp(bond->name, name)) { | |
911 | return bond; | |
912 | } | |
913 | } | |
914 | return NULL; | |
915 | } | |
916 | ||
917 | static struct bond_slave * | |
918 | bond_lookup_slave(struct bond *bond, const char *slave_name) | |
919 | { | |
920 | struct bond_slave *slave; | |
921 | ||
922 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
923 | if (!strcmp(slave->name, slave_name)) { | |
924 | return slave; | |
925 | } | |
926 | } | |
927 | return NULL; | |
928 | } | |
929 | ||
930 | static void | |
931 | bond_unixctl_list(struct unixctl_conn *conn, | |
932 | const char *args OVS_UNUSED, void *aux OVS_UNUSED) | |
933 | { | |
934 | struct ds ds = DS_EMPTY_INITIALIZER; | |
935 | const struct bond *bond; | |
936 | ||
937 | ds_put_cstr(&ds, "bond\ttype\tslaves\n"); | |
938 | ||
939 | HMAP_FOR_EACH (bond, hmap_node, &all_bonds) { | |
940 | const struct bond_slave *slave; | |
941 | size_t i; | |
942 | ||
943 | ds_put_format(&ds, "%s\t%s\t", | |
944 | bond->name, bond_mode_to_string(bond->balance)); | |
945 | ||
946 | i = 0; | |
947 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
948 | if (i++ > 0) { | |
949 | ds_put_cstr(&ds, ", "); | |
950 | } | |
951 | ds_put_cstr(&ds, slave->name); | |
952 | } | |
953 | ds_put_char(&ds, '\n'); | |
954 | } | |
955 | unixctl_command_reply(conn, 200, ds_cstr(&ds)); | |
956 | ds_destroy(&ds); | |
957 | } | |
958 | ||
959 | static void | |
960 | bond_unixctl_show(struct unixctl_conn *conn, | |
961 | const char *args, void *aux OVS_UNUSED) | |
962 | { | |
963 | struct ds ds = DS_EMPTY_INITIALIZER; | |
964 | const struct bond_slave *slave; | |
965 | const struct bond *bond; | |
966 | ||
967 | bond = bond_find(args); | |
968 | if (!bond) { | |
969 | unixctl_command_reply(conn, 501, "no such bond"); | |
970 | return; | |
971 | } | |
972 | ||
973 | ds_put_format(&ds, "bond_mode: %s\n", | |
974 | bond_mode_to_string(bond->balance)); | |
975 | ||
f620b43a BP |
976 | if (bond->balance != BM_AB) { |
977 | ds_put_format(&ds, "bond-hash-algorithm: %s\n", | |
978 | bond_is_tcp_hash(bond) ? "balance-tcp" : "balance-slb"); | |
979 | } | |
980 | ||
981 | ds_put_format(&ds, "bond-detect-mode: %s\n", | |
982 | bond->monitor ? "carrier" : "miimon"); | |
983 | ||
984 | if (!bond->monitor) { | |
985 | ds_put_format(&ds, "bond-miimon-interval: %lld\n", | |
986 | bond->miimon_interval); | |
987 | } | |
988 | ||
989 | ds_put_format(&ds, "updelay: %d ms\n", bond->updelay); | |
990 | ds_put_format(&ds, "downdelay: %d ms\n", bond->downdelay); | |
991 | ||
1b137691 | 992 | if (bond_is_balanced(bond)) { |
f620b43a BP |
993 | ds_put_format(&ds, "next rebalance: %lld ms\n", |
994 | bond->next_rebalance - time_msec()); | |
995 | } | |
996 | ||
4d6fb5eb EJ |
997 | ds_put_format(&ds, "lacp_negotiated: %s\n", |
998 | bond->lacp_negotiated ? "true" : "false"); | |
999 | ||
f620b43a BP |
1000 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { |
1001 | struct bond_entry *be; | |
1002 | struct flow flow; | |
1003 | ||
1004 | /* Basic info. */ | |
1005 | ds_put_format(&ds, "\nslave %s: %s\n", | |
1006 | slave->name, slave->enabled ? "enabled" : "disabled"); | |
1007 | if (slave == bond->active_slave) { | |
1008 | ds_put_cstr(&ds, "\tactive slave\n"); | |
1009 | } | |
1010 | if (slave->delay_expires != LLONG_MAX) { | |
1011 | ds_put_format(&ds, "\t%s expires in %lld ms\n", | |
1012 | slave->enabled ? "downdelay" : "updelay", | |
1013 | slave->delay_expires - time_msec()); | |
1014 | } | |
1015 | ||
70f25ec2 | 1016 | ds_put_format(&ds, "\tlacp_may_enable: %s\n", |
4d6fb5eb EJ |
1017 | slave->lacp_may_enable ? "true" : "false"); |
1018 | ||
1b137691 | 1019 | if (!bond_is_balanced(bond)) { |
f620b43a BP |
1020 | continue; |
1021 | } | |
1022 | ||
1023 | /* Hashes. */ | |
1024 | memset(&flow, 0, sizeof flow); | |
1025 | for (be = bond->hash; be <= &bond->hash[BOND_MASK]; be++) { | |
1026 | int hash = be - bond->hash; | |
1027 | ||
1028 | if (be->slave != slave) { | |
1029 | continue; | |
1030 | } | |
1031 | ||
1032 | ds_put_format(&ds, "\thash %d: %"PRIu64" kB load\n", | |
1033 | hash, be->tx_bytes / 1024); | |
1034 | ||
1035 | if (bond->balance != BM_SLB) { | |
1036 | continue; | |
1037 | } | |
1038 | ||
1039 | /* XXX How can we list the MACs assigned to hashes? */ | |
1040 | } | |
1041 | } | |
1042 | unixctl_command_reply(conn, 200, ds_cstr(&ds)); | |
1043 | ds_destroy(&ds); | |
1044 | } | |
1045 | ||
1046 | static void | |
1047 | bond_unixctl_migrate(struct unixctl_conn *conn, const char *args_, | |
1048 | void *aux OVS_UNUSED) | |
1049 | { | |
1050 | char *args = (char *) args_; | |
1051 | char *save_ptr = NULL; | |
1052 | char *bond_s, *hash_s, *slave_s; | |
1053 | struct bond *bond; | |
1054 | struct bond_slave *slave; | |
1055 | struct bond_entry *entry; | |
1056 | int hash; | |
1057 | ||
1058 | bond_s = strtok_r(args, " ", &save_ptr); | |
1059 | hash_s = strtok_r(NULL, " ", &save_ptr); | |
1060 | slave_s = strtok_r(NULL, " ", &save_ptr); | |
1061 | if (!slave_s) { | |
1062 | unixctl_command_reply(conn, 501, | |
1063 | "usage: bond/migrate BOND HASH SLAVE"); | |
1064 | return; | |
1065 | } | |
1066 | ||
1067 | bond = bond_find(bond_s); | |
1068 | if (!bond) { | |
1069 | unixctl_command_reply(conn, 501, "no such bond"); | |
1070 | return; | |
1071 | } | |
1072 | ||
1073 | if (bond->balance != BM_SLB) { | |
1074 | unixctl_command_reply(conn, 501, "not an SLB bond"); | |
1075 | return; | |
1076 | } | |
1077 | ||
1078 | if (strspn(hash_s, "0123456789") == strlen(hash_s)) { | |
1079 | hash = atoi(hash_s) & BOND_MASK; | |
1080 | } else { | |
1081 | unixctl_command_reply(conn, 501, "bad hash"); | |
1082 | return; | |
1083 | } | |
1084 | ||
1085 | slave = bond_lookup_slave(bond, slave_s); | |
1086 | if (!slave) { | |
1087 | unixctl_command_reply(conn, 501, "no such slave"); | |
1088 | return; | |
1089 | } | |
1090 | ||
1091 | if (!slave->enabled) { | |
1092 | unixctl_command_reply(conn, 501, "cannot migrate to disabled slave"); | |
1093 | return; | |
1094 | } | |
1095 | ||
1096 | entry = &bond->hash[hash]; | |
1097 | tag_set_add(&bond->unixctl_tags, entry->tag); | |
1098 | entry->slave = slave; | |
1099 | entry->tag = tag_create_random(); | |
1100 | unixctl_command_reply(conn, 200, "migrated"); | |
1101 | } | |
1102 | ||
1103 | static void | |
1104 | bond_unixctl_set_active_slave(struct unixctl_conn *conn, const char *args_, | |
1105 | void *aux OVS_UNUSED) | |
1106 | { | |
1107 | char *args = (char *) args_; | |
1108 | char *save_ptr = NULL; | |
1109 | char *bond_s, *slave_s; | |
1110 | struct bond *bond; | |
1111 | struct bond_slave *slave; | |
1112 | ||
1113 | bond_s = strtok_r(args, " ", &save_ptr); | |
1114 | slave_s = strtok_r(NULL, " ", &save_ptr); | |
1115 | if (!slave_s) { | |
1116 | unixctl_command_reply(conn, 501, | |
1117 | "usage: bond/set-active-slave BOND SLAVE"); | |
1118 | return; | |
1119 | } | |
1120 | ||
1121 | bond = bond_find(bond_s); | |
1122 | if (!bond) { | |
1123 | unixctl_command_reply(conn, 501, "no such bond"); | |
1124 | return; | |
1125 | } | |
1126 | ||
1127 | slave = bond_lookup_slave(bond, slave_s); | |
1128 | if (!slave) { | |
1129 | unixctl_command_reply(conn, 501, "no such slave"); | |
1130 | return; | |
1131 | } | |
1132 | ||
1133 | if (!slave->enabled) { | |
1134 | unixctl_command_reply(conn, 501, "cannot make disabled slave active"); | |
1135 | return; | |
1136 | } | |
1137 | ||
1138 | if (bond->active_slave != slave) { | |
1139 | tag_set_add(&bond->unixctl_tags, bond_get_active_slave_tag(bond)); | |
1140 | bond->active_slave = slave; | |
1141 | bond->active_slave->tag = tag_create_random(); | |
1142 | VLOG_INFO("bond %s: active interface is now %s", | |
1143 | bond->name, slave->name); | |
1144 | bond->send_learning_packets = true; | |
1145 | unixctl_command_reply(conn, 200, "done"); | |
1146 | } else { | |
1147 | unixctl_command_reply(conn, 200, "no change"); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | static void | |
1152 | enable_slave(struct unixctl_conn *conn, const char *args_, bool enable) | |
1153 | { | |
1154 | char *args = (char *) args_; | |
1155 | char *save_ptr = NULL; | |
1156 | char *bond_s, *slave_s; | |
1157 | struct bond *bond; | |
1158 | struct bond_slave *slave; | |
1159 | ||
1160 | bond_s = strtok_r(args, " ", &save_ptr); | |
1161 | slave_s = strtok_r(NULL, " ", &save_ptr); | |
1162 | if (!slave_s) { | |
1163 | char *usage = xasprintf("usage: bond/%s-slave BOND SLAVE", | |
1164 | enable ? "enable" : "disable"); | |
1165 | unixctl_command_reply(conn, 501, usage); | |
1166 | free(usage); | |
1167 | return; | |
1168 | } | |
1169 | ||
1170 | bond = bond_find(bond_s); | |
1171 | if (!bond) { | |
1172 | unixctl_command_reply(conn, 501, "no such bond"); | |
1173 | return; | |
1174 | } | |
1175 | ||
1176 | slave = bond_lookup_slave(bond, slave_s); | |
1177 | if (!slave) { | |
1178 | unixctl_command_reply(conn, 501, "no such slave"); | |
1179 | return; | |
1180 | } | |
1181 | ||
1182 | bond_enable_slave(slave, enable, &bond->unixctl_tags); | |
1183 | unixctl_command_reply(conn, 501, enable ? "enabled" : "disabled"); | |
1184 | } | |
1185 | ||
1186 | static void | |
1187 | bond_unixctl_enable_slave(struct unixctl_conn *conn, const char *args, | |
1188 | void *aux OVS_UNUSED) | |
1189 | { | |
1190 | enable_slave(conn, args, true); | |
1191 | } | |
1192 | ||
1193 | static void | |
1194 | bond_unixctl_disable_slave(struct unixctl_conn *conn, const char *args, | |
1195 | void *aux OVS_UNUSED) | |
1196 | { | |
1197 | enable_slave(conn, args, false); | |
1198 | } | |
1199 | ||
1200 | static void | |
1201 | bond_unixctl_hash(struct unixctl_conn *conn, const char *args_, | |
1202 | void *aux OVS_UNUSED) | |
1203 | { | |
1204 | char *args = (char *) args_; | |
1205 | uint8_t mac[ETH_ADDR_LEN]; | |
1206 | uint8_t hash; | |
1207 | char *hash_cstr; | |
1208 | unsigned int vlan; | |
1209 | char *mac_s, *vlan_s; | |
1210 | char *save_ptr = NULL; | |
1211 | ||
1212 | mac_s = strtok_r(args, " ", &save_ptr); | |
1213 | vlan_s = strtok_r(NULL, " ", &save_ptr); | |
1214 | ||
1215 | if (vlan_s) { | |
1216 | if (sscanf(vlan_s, "%u", &vlan) != 1) { | |
1217 | unixctl_command_reply(conn, 501, "invalid vlan"); | |
1218 | return; | |
1219 | } | |
1220 | } else { | |
1221 | vlan = OFP_VLAN_NONE; | |
1222 | } | |
1223 | ||
1224 | if (sscanf(mac_s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac)) | |
1225 | == ETH_ADDR_SCAN_COUNT) { | |
1226 | hash = bond_hash_src(mac, vlan) & BOND_MASK; | |
1227 | ||
1228 | hash_cstr = xasprintf("%u", hash); | |
1229 | unixctl_command_reply(conn, 200, hash_cstr); | |
1230 | free(hash_cstr); | |
1231 | } else { | |
1232 | unixctl_command_reply(conn, 501, "invalid mac"); | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | void | |
1237 | bond_init(void) | |
1238 | { | |
f620b43a BP |
1239 | unixctl_command_register("bond/list", bond_unixctl_list, NULL); |
1240 | unixctl_command_register("bond/show", bond_unixctl_show, NULL); | |
1241 | unixctl_command_register("bond/migrate", bond_unixctl_migrate, NULL); | |
1242 | unixctl_command_register("bond/set-active-slave", | |
1243 | bond_unixctl_set_active_slave, NULL); | |
1244 | unixctl_command_register("bond/enable-slave", bond_unixctl_enable_slave, | |
1245 | NULL); | |
1246 | unixctl_command_register("bond/disable-slave", bond_unixctl_disable_slave, | |
1247 | NULL); | |
1248 | unixctl_command_register("bond/hash", bond_unixctl_hash, NULL); | |
1249 | } | |
1250 | \f | |
95aafb2a EJ |
1251 | static void |
1252 | bond_entry_reset(struct bond *bond) | |
1253 | { | |
1254 | if (bond->balance != BM_AB) { | |
1255 | size_t hash_len = (BOND_MASK + 1) * sizeof *bond->hash; | |
1256 | ||
1257 | if (!bond->hash) { | |
1258 | bond->hash = xmalloc(hash_len); | |
1259 | } | |
1260 | memset(bond->hash, 0, hash_len); | |
1261 | ||
1262 | bond->next_rebalance = time_msec() + bond->rebalance_interval; | |
1263 | } else { | |
1264 | free(bond->hash); | |
1265 | bond->hash = NULL; | |
1266 | } | |
1267 | } | |
1268 | ||
f620b43a BP |
1269 | static struct bond_slave * |
1270 | bond_slave_lookup(struct bond *bond, const void *slave_) | |
1271 | { | |
1272 | struct bond_slave *slave; | |
1273 | ||
1274 | HMAP_FOR_EACH_IN_BUCKET (slave, hmap_node, hash_pointer(slave_, 0), | |
1275 | &bond->slaves) { | |
1276 | if (slave->aux == slave_) { | |
1277 | return slave; | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | return NULL; | |
1282 | } | |
1283 | ||
1284 | static bool | |
1285 | bond_is_link_up(struct bond *bond, struct netdev *netdev) | |
1286 | { | |
1287 | return (bond->detect == BLSM_CARRIER | |
1288 | ? netdev_get_carrier(netdev) | |
1289 | : netdev_get_miimon(netdev)); | |
1290 | } | |
1291 | ||
1292 | static void | |
1293 | bond_enable_slave(struct bond_slave *slave, bool enable, struct tag_set *tags) | |
1294 | { | |
7321e30e | 1295 | struct bond *bond = slave->bond; |
f620b43a BP |
1296 | slave->delay_expires = LLONG_MAX; |
1297 | if (enable != slave->enabled) { | |
1298 | slave->enabled = enable; | |
1299 | if (!slave->enabled) { | |
1300 | VLOG_WARN("interface %s: disabled", slave->name); | |
b3c18f66 EJ |
1301 | if (tags) { |
1302 | tag_set_add(tags, slave->tag); | |
1303 | } | |
f620b43a BP |
1304 | } else { |
1305 | VLOG_WARN("interface %s: enabled", slave->name); | |
1306 | slave->tag = tag_create_random(); | |
1307 | } | |
7321e30e EJ |
1308 | |
1309 | if (bond->balance == BM_STABLE) { | |
1310 | bond->bond_revalidate = true; | |
1311 | } | |
f620b43a BP |
1312 | } |
1313 | } | |
1314 | ||
1315 | static void | |
1316 | bond_link_status_update(struct bond_slave *slave, struct tag_set *tags) | |
1317 | { | |
1318 | struct bond *bond = slave->bond; | |
1319 | bool up; | |
1320 | ||
4d6fb5eb | 1321 | up = slave->up && slave->lacp_may_enable; |
f620b43a BP |
1322 | if ((up == slave->enabled) != (slave->delay_expires == LLONG_MAX)) { |
1323 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
1324 | VLOG_INFO_RL(&rl, "interface %s: link state %s", | |
1325 | slave->name, up ? "up" : "down"); | |
1326 | if (up == slave->enabled) { | |
1327 | slave->delay_expires = LLONG_MAX; | |
1328 | VLOG_INFO_RL(&rl, "interface %s: will not be %s", | |
1329 | slave->name, up ? "disabled" : "enabled"); | |
1330 | } else { | |
4d6fb5eb | 1331 | int delay = (bond->lacp_negotiated ? 0 |
f620b43a BP |
1332 | : up ? bond->updelay : bond->downdelay); |
1333 | slave->delay_expires = time_msec() + delay; | |
1334 | if (delay) { | |
1335 | VLOG_INFO_RL(&rl, "interface %s: will be %s if it stays %s " | |
1336 | "for %d ms", | |
1337 | slave->name, | |
1338 | up ? "enabled" : "disabled", | |
1339 | up ? "up" : "down", | |
1340 | delay); | |
1341 | } | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | if (time_msec() >= slave->delay_expires) { | |
1346 | bond_enable_slave(slave, up, tags); | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | static bool | |
1351 | bond_is_tcp_hash(const struct bond *bond) | |
1352 | { | |
fb0b29a3 | 1353 | return (bond->balance == BM_TCP || bond->balance == BM_STABLE) |
4d6fb5eb | 1354 | && bond->lacp_negotiated; |
f620b43a BP |
1355 | } |
1356 | ||
1357 | static unsigned int | |
1358 | bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan) | |
1359 | { | |
1360 | return hash_bytes(mac, ETH_ADDR_LEN, vlan); | |
1361 | } | |
1362 | ||
1363 | static unsigned int | |
1364 | bond_hash_tcp(const struct flow *flow, uint16_t vlan) | |
1365 | { | |
1366 | struct flow hash_flow = *flow; | |
1367 | hash_flow.vlan_tci = vlan; | |
1368 | ||
1369 | /* The symmetric quality of this hash function is not required, but | |
1370 | * flow_hash_symmetric_l4 already exists, and is sufficient for our | |
1371 | * purposes, so we use it out of convenience. */ | |
1372 | return flow_hash_symmetric_l4(&hash_flow, 0); | |
1373 | } | |
1374 | ||
fb0b29a3 EJ |
1375 | static unsigned int |
1376 | bond_hash(const struct bond *bond, const struct flow *flow, uint16_t vlan) | |
1377 | { | |
1378 | assert(bond->balance != BM_AB); | |
1379 | ||
1380 | return (bond_is_tcp_hash(bond) | |
1381 | ? bond_hash_tcp(flow, vlan) | |
1382 | : bond_hash_src(flow->dl_src, vlan)); | |
1383 | } | |
1384 | ||
f620b43a BP |
1385 | static struct bond_entry * |
1386 | lookup_bond_entry(const struct bond *bond, const struct flow *flow, | |
1387 | uint16_t vlan) | |
1388 | { | |
fb0b29a3 | 1389 | return &bond->hash[bond_hash(bond, flow, vlan) & BOND_MASK]; |
f620b43a BP |
1390 | } |
1391 | ||
7321e30e EJ |
1392 | /* This function uses Highest Random Weight hashing to choose an output slave. |
1393 | * This approach only reassigns a minimal number of flows when slaves are | |
1394 | * enabled or disabled. Unfortunately, it has O(n) performance against the | |
1395 | * number of slaves. There exist algorithms which are O(1), but have slightly | |
1396 | * more complex implementations and require the use of memory. This may need | |
1397 | * to be reimplemented if it becomes a performance bottleneck. */ | |
1398 | static struct bond_slave * | |
1399 | choose_stb_slave(const struct bond *bond, const struct flow *flow, | |
1400 | uint16_t vlan) | |
1401 | { | |
1402 | struct bond_slave *best, *slave; | |
1403 | uint32_t best_hash, flow_hash; | |
1404 | ||
1405 | best = NULL; | |
1406 | best_hash = 0; | |
1407 | flow_hash = bond_hash(bond, flow, vlan); | |
1408 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1409 | if (slave->enabled) { | |
1410 | uint32_t hash; | |
1411 | ||
1412 | hash = hash_2words(flow_hash, slave->stb_id); | |
1413 | if (!best || hash > best_hash) { | |
1414 | best = slave; | |
1415 | best_hash = hash; | |
1416 | } | |
1417 | } | |
1418 | } | |
1419 | ||
1420 | return best; | |
1421 | } | |
1422 | ||
f620b43a BP |
1423 | static struct bond_slave * |
1424 | choose_output_slave(const struct bond *bond, const struct flow *flow, | |
1425 | uint16_t vlan) | |
1426 | { | |
1427 | struct bond_entry *e; | |
1428 | ||
1429 | switch (bond->balance) { | |
1430 | case BM_AB: | |
1431 | return bond->active_slave; | |
1432 | ||
fb0b29a3 | 1433 | case BM_STABLE: |
7321e30e | 1434 | return choose_stb_slave(bond, flow, vlan); |
f620b43a BP |
1435 | case BM_SLB: |
1436 | case BM_TCP: | |
1437 | e = lookup_bond_entry(bond, flow, vlan); | |
1438 | if (!e->slave || !e->slave->enabled) { | |
c804cadf EJ |
1439 | e->slave = CONTAINER_OF(hmap_random_node(&bond->slaves), |
1440 | struct bond_slave, hmap_node); | |
1441 | if (!e->slave->enabled) { | |
1442 | e->slave = bond->active_slave; | |
1443 | } | |
f620b43a BP |
1444 | e->tag = tag_create_random(); |
1445 | } | |
1446 | return e->slave; | |
1447 | ||
1448 | default: | |
1449 | NOT_REACHED(); | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | static struct bond_slave * | |
1454 | bond_choose_slave(const struct bond *bond) | |
1455 | { | |
1456 | struct bond_slave *slave, *best; | |
1457 | ||
1458 | /* Find an enabled slave. */ | |
1459 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1460 | if (slave->enabled) { | |
1461 | return slave; | |
1462 | } | |
1463 | } | |
1464 | ||
1465 | /* All interfaces are disabled. Find an interface that will be enabled | |
1466 | * after its updelay expires. */ | |
1467 | best = NULL; | |
1468 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1469 | if (slave->delay_expires != LLONG_MAX | |
4d6fb5eb | 1470 | && slave->lacp_may_enable |
f620b43a BP |
1471 | && (!best || slave->delay_expires < best->delay_expires)) { |
1472 | best = slave; | |
1473 | } | |
1474 | } | |
1475 | return best; | |
1476 | } | |
1477 | ||
1478 | static void | |
1479 | bond_choose_active_slave(struct bond *bond, struct tag_set *tags) | |
1480 | { | |
1481 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
1482 | struct bond_slave *old_active_slave = bond->active_slave; | |
1483 | ||
1484 | bond->active_slave = bond_choose_slave(bond); | |
1485 | if (bond->active_slave) { | |
1486 | if (bond->active_slave->enabled) { | |
1487 | VLOG_INFO_RL(&rl, "bond %s: active interface is now %s", | |
1488 | bond->name, bond->active_slave->name); | |
1489 | } else { | |
1490 | VLOG_INFO_RL(&rl, "bond %s: active interface is now %s, skipping " | |
1491 | "remaining %lld ms updelay (since no interface was " | |
1492 | "enabled)", bond->name, bond->active_slave->name, | |
1493 | bond->active_slave->delay_expires - time_msec()); | |
1494 | bond_enable_slave(bond->active_slave, true, tags); | |
1495 | } | |
1496 | ||
1497 | if (!old_active_slave) { | |
1498 | tag_set_add(tags, bond->no_slaves_tag); | |
1499 | } | |
1500 | ||
1501 | bond->send_learning_packets = true; | |
1502 | } else if (old_active_slave) { | |
1503 | VLOG_WARN_RL(&rl, "bond %s: all interfaces disabled", bond->name); | |
1504 | } | |
1505 | } | |
1506 | ||
1507 | /* Returns the tag for 'bond''s active slave, or 'bond''s no_slaves_tag if | |
1508 | * there is no active slave. */ | |
1509 | static tag_type | |
1510 | bond_get_active_slave_tag(const struct bond *bond) | |
1511 | { | |
1512 | return (bond->active_slave | |
1513 | ? bond->active_slave->tag | |
1514 | : bond->no_slaves_tag); | |
1515 | } | |
1516 | ||
1517 | /* Attempts to make the sum of the bond slaves' statistics appear on the fake | |
1518 | * bond interface. */ | |
1519 | static void | |
1520 | bond_update_fake_slave_stats(struct bond *bond) | |
1521 | { | |
1522 | struct netdev_stats bond_stats; | |
1523 | struct bond_slave *slave; | |
1524 | struct netdev *bond_dev; | |
1525 | ||
1526 | memset(&bond_stats, 0, sizeof bond_stats); | |
1527 | ||
1528 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1529 | struct netdev_stats slave_stats; | |
1530 | ||
1531 | if (!netdev_get_stats(slave->netdev, &slave_stats)) { | |
1532 | /* XXX: We swap the stats here because they are swapped back when | |
1533 | * reported by the internal device. The reason for this is | |
1534 | * internal devices normally represent packets going into the | |
1535 | * system but when used as fake bond device they represent packets | |
1536 | * leaving the system. We really should do this in the internal | |
1537 | * device itself because changing it here reverses the counts from | |
1538 | * the perspective of the switch. However, the internal device | |
1539 | * doesn't know what type of device it represents so we have to do | |
1540 | * it here for now. */ | |
1541 | bond_stats.tx_packets += slave_stats.rx_packets; | |
1542 | bond_stats.tx_bytes += slave_stats.rx_bytes; | |
1543 | bond_stats.rx_packets += slave_stats.tx_packets; | |
1544 | bond_stats.rx_bytes += slave_stats.tx_bytes; | |
1545 | } | |
1546 | } | |
1547 | ||
1548 | if (!netdev_open_default(bond->name, &bond_dev)) { | |
1549 | netdev_set_stats(bond_dev, &bond_stats); | |
1550 | netdev_close(bond_dev); | |
1551 | } | |
1552 | } |