lib/lacp.c

   1 /* Copyright (c) 2011 Nicira Networks
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <config.h>
  17 #include "lacp.h"
  18
  19 #include <assert.h>
  20 #include <stdlib.h>
  21
  22 #include "dynamic-string.h"
  23 #include "hash.h"
  24 #include "hmap.h"
  25 #include "ofpbuf.h"
  26 #include "packets.h"
  27 #include "poll-loop.h"
  28 #include "timer.h"
  29 #include "timeval.h"
  30 #include "unixctl.h"
  31 #include "vlog.h"
  32
  33 VLOG_DEFINE_THIS_MODULE(lacp);
  34
  35 /* Masks for lacp_info state member. */
  36 #define LACP_STATE_ACT  0x01 /* Activity. Active or passive? */
  37 #define LACP_STATE_TIME 0x02 /* Timeout. Short or long timeout? */
  38 #define LACP_STATE_AGG  0x04 /* Aggregation. Is the link is bondable? */
  39 #define LACP_STATE_SYNC 0x08 /* Synchronization. Is the link in up to date? */
  40 #define LACP_STATE_COL  0x10 /* Collecting. Is the link receiving frames? */
  41 #define LACP_STATE_DIST 0x20 /* Distributing. Is the link sending frames? */
  42 #define LACP_STATE_DEF  0x40 /* Defaulted. Using default partner info? */
  43 #define LACP_STATE_EXP  0x80 /* Expired. Using expired partner info? */
  44
  45 #define LACP_FAST_TIME_TX 1000  /* Fast transmission rate. */
  46 #define LACP_SLOW_TIME_TX 30000 /* Slow transmission rate. */
  47 #define LACP_RX_MULTIPLIER 3    /* Multiply by TX rate to get RX rate. */
  48
  49 #define LACP_INFO_LEN 15
  50 struct lacp_info {
  51     ovs_be16 sys_priority;            /* System priority. */
  52     uint8_t sys_id[ETH_ADDR_LEN];     /* System ID. */
  53     ovs_be16 key;                     /* Operational key. */
  54     ovs_be16 port_priority;           /* Port priority. */
  55     ovs_be16 port_id;                 /* Port ID. */
  56     uint8_t state;                    /* State mask.  See LACP_STATE macros. */
  57 } __attribute__((packed));
  58 BUILD_ASSERT_DECL(LACP_INFO_LEN == sizeof(struct lacp_info));
  59
  60 #define LACP_PDU_LEN 110
  61 struct lacp_pdu {
  62     uint8_t subtype;          /* Always 1. */
  63     uint8_t version;          /* Always 1. */
  64
  65     uint8_t actor_type;       /* Always 1. */
  66     uint8_t actor_len;        /* Always 20. */
  67     struct lacp_info actor;   /* LACP actor information. */
  68     uint8_t z1[3];            /* Reserved.  Always 0. */
  69
  70     uint8_t partner_type;     /* Always 2. */
  71     uint8_t partner_len;      /* Always 20. */
  72     struct lacp_info partner; /* LACP partner information. */
  73     uint8_t z2[3];            /* Reserved.  Always 0. */
  74
  75     uint8_t collector_type;   /* Always 3. */
  76     uint8_t collector_len;    /* Always 16. */
  77     ovs_be16 collector_delay; /* Maximum collector delay. Set to UINT16_MAX. */
  78     uint8_t z3[64];           /* Combination of several fields.  Always 0. */
  79 } __attribute__((packed));
  80 BUILD_ASSERT_DECL(LACP_PDU_LEN == sizeof(struct lacp_pdu));
  81 \f
  82 /* Implementation. */
  83
  84 enum slave_status {
  85     LACP_CURRENT,   /* Current State.  Partner up to date. */
  86     LACP_EXPIRED,   /* Expired State.  Partner out of date. */
  87     LACP_DEFAULTED, /* Defaulted State.  No partner. */
  88 };
  89
  90 struct lacp {
  91     struct list node;             /* Node in all_lacps list. */
  92     char *name;                   /* Name of this lacp object. */
  93     uint8_t sys_id[ETH_ADDR_LEN]; /* System ID. */
  94     uint16_t sys_priority;        /* System Priority. */
  95     bool active;                  /* Active or Passive. */
  96
  97     struct hmap slaves;      /* Slaves this LACP object controls. */
  98     struct slave *key_slave; /* Slave whose ID will be the aggregation key. */
  99
 100     enum lacp_time lacp_time;  /* Fast, Slow or Custom LACP time. */
 101     long long int custom_time; /* LACP_TIME_CUSTOM transmission rate. */
 102     bool negotiated;         /* True if LACP negotiations were successful. */
 103     bool update;             /* True if lacp_update() needs to be called. */
 104     bool heartbeat;          /* LACP heartbeat mode. */
 105 };
 106
 107 struct slave {
 108     void *aux;                    /* Handle used to identify this slave. */
 109     struct hmap_node node;        /* Node in master's slaves map. */
 110
 111     struct lacp *lacp;            /* LACP object containing this slave. */
 112     uint16_t port_id;             /* Port ID. */
 113     uint16_t port_priority;       /* Port Priority. */
 114     uint16_t key;                 /* Aggregation Key. 0 if default. */
 115     char *name;                   /* Name of this slave. */
 116
 117     enum slave_status status;     /* Slave status. */
 118     bool attached;                /* Attached. Traffic may flow. */
 119     struct lacp_info partner;     /* Partner information. */
 120     struct lacp_info ntt_actor;   /* Used to decide if we Need To Transmit. */
 121     struct timer tx;              /* Next message transmission timer. */
 122     struct timer rx;              /* Expected message receive timer. */
 123 };
 124
 125 static struct list all_lacps = LIST_INITIALIZER(&all_lacps);
 126
 127 static void lacp_update_attached(struct lacp *);
 128
 129 static void slave_destroy(struct slave *);
 130 static void slave_set_defaulted(struct slave *);
 131 static void slave_set_expired(struct slave *);
 132 static void slave_get_actor(struct slave *, struct lacp_info *actor);
 133 static void slave_get_priority(struct slave *, struct lacp_info *priority);
 134 static bool slave_may_tx(const struct slave *);
 135 static struct slave *slave_lookup(const struct lacp *, const void *slave);
 136 static bool info_tx_equal(struct lacp_info *, struct lacp_info *);
 137
 138 static void lacp_unixctl_show(struct unixctl_conn *, const char *args,
 139                               void *aux);
 140
 141 /* Populates 'pdu' with a LACP PDU comprised of 'actor' and 'partner'. */
 142 static void
 143 compose_lacp_pdu(const struct lacp_info *actor,
 144                  const struct lacp_info *partner, struct lacp_pdu *pdu)
 145 {
 146     memset(pdu, 0, sizeof *pdu);
 147
 148     pdu->subtype = 1;
 149     pdu->version = 1;
 150
 151     pdu->actor_type = 1;
 152     pdu->actor_len = 20;
 153     pdu->actor = *actor;
 154
 155     pdu->partner_type = 2;
 156     pdu->partner_len = 20;
 157     pdu->partner = *partner;
 158
 159     pdu->collector_type = 3;
 160     pdu->collector_len = 16;
 161     pdu->collector_delay = htons(0);
 162 }
 163
 164 /* Parses 'b' which represents a packet containing a LACP PDU.  This function
 165  * returns NULL if 'b' is malformed, or does not represent a LACP PDU format
 166  * supported by OVS.  Otherwise, it returns a pointer to the lacp_pdu contained
 167  * within 'b'. */
 168 static const struct lacp_pdu *
 169 parse_lacp_packet(const struct ofpbuf *b)
 170 {
 171     const struct lacp_pdu *pdu;
 172
 173     pdu = ofpbuf_at(b, (uint8_t *)b->l3 - (uint8_t *)b->data, LACP_PDU_LEN);
 174
 175     if (pdu && pdu->subtype == 1
 176         && pdu->actor_type == 1 && pdu->actor_len == 20
 177         && pdu->partner_type == 2 && pdu->partner_len == 20) {
 178         return pdu;
 179     } else {
 180         return NULL;
 181     }
 182 }
 183 \f
 184 /* LACP Protocol Implementation. */
 185
 186 /* Initializes the lacp module. */
 187 void
 188 lacp_init(void)
 189 {
 190     unixctl_command_register("lacp/show", "port", lacp_unixctl_show, NULL);
 191 }
 192
 193 /* Creates a LACP object. */
 194 struct lacp *
 195 lacp_create(void)
 196 {
 197     struct lacp *lacp;
 198
 199     lacp = xzalloc(sizeof *lacp);
 200     hmap_init(&lacp->slaves);
 201     list_push_back(&all_lacps, &lacp->node);
 202     return lacp;
 203 }
 204
 205 /* Destroys 'lacp' and its slaves. Does nothing if 'lacp' is NULL. */
 206 void
 207 lacp_destroy(struct lacp *lacp)
 208 {
 209     if (lacp) {
 210         struct slave *slave, *next;
 211
 212         HMAP_FOR_EACH_SAFE (slave, next, node, &lacp->slaves) {
 213             slave_destroy(slave);
 214         }
 215
 216         hmap_destroy(&lacp->slaves);
 217         list_remove(&lacp->node);
 218         free(lacp->name);
 219         free(lacp);
 220     }
 221 }
 222
 223 /* Configures 'lacp' with settings from 's'. */
 224 void
 225 lacp_configure(struct lacp *lacp, const struct lacp_settings *s)
 226 {
 227     if (!lacp->name || strcmp(s->name, lacp->name)) {
 228         free(lacp->name);
 229         lacp->name = xstrdup(s->name);
 230     }
 231
 232     if (!eth_addr_equals(lacp->sys_id, s->id)
 233         || lacp->sys_priority != s->priority
 234         || lacp->heartbeat != s->heartbeat) {
 235         memcpy(lacp->sys_id, s->id, ETH_ADDR_LEN);
 236         lacp->sys_priority = s->priority;
 237         lacp->heartbeat = s->heartbeat;
 238         lacp->update = true;
 239     }
 240
 241     lacp->active = s->active;
 242     lacp->lacp_time = s->lacp_time;
 243     lacp->custom_time = MAX(TIME_UPDATE_INTERVAL, s->custom_time);
 244 }
 245
 246 /* Returns true if 'lacp' is configured in active mode, false if 'lacp' is
 247  * configured for passive mode. */
 248 bool
 249 lacp_is_active(const struct lacp *lacp)
 250 {
 251     return lacp->active;
 252 }
 253
 254 /* Processes 'packet' which was received on 'slave_'.  This function should be
 255  * called on all packets received on 'slave_' with Ethernet Type ETH_TYPE_LACP.
 256  */
 257 void
 258 lacp_process_packet(struct lacp *lacp, const void *slave_,
 259                     const struct ofpbuf *packet)
 260 {
 261     static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
 262     struct slave *slave = slave_lookup(lacp, slave_);
 263     const struct lacp_pdu *pdu;
 264     long long int tx_rate;
 265
 266     pdu = parse_lacp_packet(packet);
 267     if (!pdu) {
 268         VLOG_WARN_RL(&rl, "%s: received an unparsable LACP PDU.", lacp->name);
 269         return;
 270     }
 271
 272     switch (lacp->lacp_time) {
 273     case LACP_TIME_FAST:
 274         tx_rate = LACP_FAST_TIME_TX;
 275         break;
 276     case LACP_TIME_SLOW:
 277         tx_rate = LACP_SLOW_TIME_TX;
 278         break;
 279     case LACP_TIME_CUSTOM:
 280         tx_rate = lacp->custom_time;
 281         break;
 282     default: NOT_REACHED();
 283     }
 284
 285     slave->status = LACP_CURRENT;
 286     timer_set_duration(&slave->rx, LACP_RX_MULTIPLIER * tx_rate);
 287
 288     slave->ntt_actor = pdu->partner;
 289
 290     /* Update our information about our partner if it's out of date.  This may
 291      * cause priorities to change so re-calculate attached status of all
 292      * slaves.  */
 293     if (memcmp(&slave->partner, &pdu->actor, sizeof pdu->actor)) {
 294         lacp->update = true;
 295         slave->partner = pdu->actor;
 296     }
 297 }
 298
 299 /* Returns true if 'lacp' has successfully negotiated with its partner.  False
 300  * if 'lacp' is NULL. */
 301 bool
 302 lacp_negotiated(const struct lacp *lacp)
 303 {
 304     return lacp ? lacp->negotiated : false;
 305 }
 306
 307 /* Registers 'slave_' as subordinate to 'lacp'.  This should be called at least
 308  * once per slave in a LACP managed bond.  Should also be called whenever a
 309  * slave's settings change. */
 310 void
 311 lacp_slave_register(struct lacp *lacp, void *slave_,
 312                     const struct lacp_slave_settings *s)
 313 {
 314     struct slave *slave = slave_lookup(lacp, slave_);
 315
 316     if (!slave) {
 317         slave = xzalloc(sizeof *slave);
 318         slave->lacp = lacp;
 319         slave->aux = slave_;
 320         hmap_insert(&lacp->slaves, &slave->node, hash_pointer(slave_, 0));
 321         slave_set_defaulted(slave);
 322
 323         if (!lacp->key_slave) {
 324             lacp->key_slave = slave;
 325         }
 326     }
 327
 328     if (!slave->name || strcmp(s->name, slave->name)) {
 329         free(slave->name);
 330         slave->name = xstrdup(s->name);
 331     }
 332
 333     if (slave->port_id != s->id
 334         || slave->port_priority != s->priority
 335         || slave->key != s->key) {
 336         slave->port_id = s->id;
 337         slave->port_priority = s->priority;
 338         slave->key = s->key;
 339
 340         lacp->update = true;
 341
 342         if (lacp->active || lacp->negotiated) {
 343             slave_set_expired(slave);
 344         }
 345     }
 346 }
 347
 348 /* Unregisters 'slave_' with 'lacp'.  */
 349 void
 350 lacp_slave_unregister(struct lacp *lacp, const void *slave_)
 351 {
 352     struct slave *slave = slave_lookup(lacp, slave_);
 353
 354     if (slave) {
 355         slave_destroy(slave);
 356         lacp->update = true;
 357     }
 358 }
 359
 360 /* This function should be called whenever the carrier status of 'slave_' has
 361  * changed. */
 362 void
 363 lacp_slave_carrier_changed(const struct lacp *lacp, const void *slave_)
 364 {
 365     struct slave *slave = slave_lookup(lacp, slave_);
 366
 367     if (slave->status == LACP_CURRENT || slave->lacp->active) {
 368         slave_set_expired(slave);
 369     }
 370 }
 371
 372 /* This function should be called before enabling 'slave_' to send or receive
 373  * traffic.  If it returns false, 'slave_' should not enabled.  As a
 374  * convenience, returns true if 'lacp' is NULL. */
 375 bool
 376 lacp_slave_may_enable(const struct lacp *lacp, const void *slave_)
 377 {
 378     if (lacp) {
 379         struct slave *slave = slave_lookup(lacp, slave_);
 380
 381         /* The slave may be enabled if it's attached to an aggregator and its
 382          * partner is synchronized.  The only exception is defaulted slaves.
 383          * They are not required to have synchronized partners because they
 384          * have no partners at all.  They will only be attached if negotiations
 385          * failed on all slaves in the bond. */
 386         return slave->attached && (slave->partner.state & LACP_STATE_SYNC
 387                                    || slave->status == LACP_DEFAULTED);
 388     } else {
 389         return true;
 390     }
 391 }
 392
 393 /* Returns the port ID used for 'slave_' in LACP communications. */
 394 uint16_t
 395 lacp_slave_get_port_id(const struct lacp *lacp, const void *slave_)
 396 {
 397     struct slave *slave = slave_lookup(lacp, slave_);
 398     return slave->port_id;
 399 }
 400
 401 /* Returns true if partner information on 'slave_' is up to date.  'slave_'
 402  * not being current, generally indicates a connectivity problem, or a
 403  * misconfigured (or broken) partner. */
 404 bool
 405 lacp_slave_is_current(const struct lacp *lacp, const void *slave_)
 406 {
 407     return slave_lookup(lacp, slave_)->status != LACP_DEFAULTED;
 408 }
 409
 410 /* This function should be called periodically to update 'lacp'. */
 411 void
 412 lacp_run(struct lacp *lacp, lacp_send_pdu *send_pdu)
 413 {
 414     struct slave *slave;
 415
 416     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 417         if (timer_expired(&slave->rx)) {
 418             if (slave->status == LACP_CURRENT) {
 419                 slave_set_expired(slave);
 420             } else if (slave->status == LACP_EXPIRED) {
 421                 slave_set_defaulted(slave);
 422             }
 423         }
 424     }
 425
 426     if (lacp->update) {
 427         lacp_update_attached(lacp);
 428     }
 429
 430     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 431         struct lacp_info actor;
 432
 433         if (!slave_may_tx(slave)) {
 434             continue;
 435         }
 436
 437         slave_get_actor(slave, &actor);
 438
 439         if (timer_expired(&slave->tx)
 440             || !info_tx_equal(&actor, &slave->ntt_actor)) {
 441             long long int duration;
 442             struct lacp_pdu pdu;
 443
 444             slave->ntt_actor = actor;
 445             compose_lacp_pdu(&actor, &slave->partner, &pdu);
 446             send_pdu(slave->aux, &pdu, sizeof pdu);
 447
 448             if (lacp->lacp_time == LACP_TIME_CUSTOM) {
 449                 duration = lacp->custom_time;
 450             } else {
 451                 duration = (slave->partner.state & LACP_STATE_TIME
 452                             ? LACP_FAST_TIME_TX
 453                             : LACP_SLOW_TIME_TX);
 454             }
 455
 456             timer_set_duration(&slave->tx, duration);
 457         }
 458     }
 459 }
 460
 461 /* Causes poll_block() to wake up when lacp_run() needs to be called again. */
 462 void
 463 lacp_wait(struct lacp *lacp)
 464 {
 465     struct slave *slave;
 466
 467     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 468         if (slave_may_tx(slave)) {
 469             timer_wait(&slave->tx);
 470         }
 471
 472         if (slave->status != LACP_DEFAULTED) {
 473             timer_wait(&slave->rx);
 474         }
 475     }
 476 }
 477 \f
 478 /* Static Helpers. */
 479
 480 /* Updates the attached status of all slaves controlled by 'lacp' and sets its
 481  * negotiated parameter to true if any slaves are attachable. */
 482 static void
 483 lacp_update_attached(struct lacp *lacp)
 484 {
 485     struct slave *lead, *slave;
 486     struct lacp_info lead_pri;
 487     static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 10);
 488
 489     if (lacp->heartbeat) {
 490         HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 491             slave->attached = slave->status != LACP_DEFAULTED;
 492         }
 493         return;
 494     }
 495
 496     lacp->update = false;
 497
 498     lead = NULL;
 499     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 500         struct lacp_info pri;
 501
 502         slave->attached = true;
 503
 504         /* XXX: In the future allow users to configure the expected system ID.
 505          * For now just special case loopback. */
 506         if (eth_addr_equals(slave->partner.sys_id, slave->lacp->sys_id)) {
 507             VLOG_WARN_RL(&rl, "slave %s: Loopback detected. Slave is "
 508                          "connected to its own bond", slave->name);
 509             slave->attached = false;
 510             continue;
 511         }
 512
 513         if (slave->status == LACP_DEFAULTED) {
 514             continue;
 515         }
 516
 517         slave_get_priority(slave, &pri);
 518
 519         if (!lead || memcmp(&pri, &lead_pri, sizeof pri) < 0) {
 520             lead = slave;
 521             lead_pri = pri;
 522         }
 523     }
 524
 525     lacp->negotiated = lead != NULL;
 526
 527     if (lead) {
 528         HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 529             if (slave->status == LACP_DEFAULTED
 530                 || lead->partner.key != slave->partner.key
 531                 || !eth_addr_equals(lead->partner.sys_id,
 532                                     slave->partner.sys_id)) {
 533                 slave->attached = false;
 534             }
 535         }
 536     }
 537 }
 538
 539 static void
 540 slave_destroy(struct slave *slave)
 541 {
 542     if (slave) {
 543         struct lacp *lacp = slave->lacp;
 544
 545         lacp->update = true;
 546         hmap_remove(&lacp->slaves, &slave->node);
 547
 548         if (lacp->key_slave == slave) {
 549             struct hmap_node *slave_node = hmap_first(&lacp->slaves);
 550
 551             if (slave_node) {
 552                 lacp->key_slave = CONTAINER_OF(slave_node, struct slave, node);
 553             } else {
 554                 lacp->key_slave = NULL;
 555             }
 556         }
 557
 558         free(slave->name);
 559         free(slave);
 560     }
 561 }
 562
 563 static void
 564 slave_set_defaulted(struct slave *slave)
 565 {
 566     memset(&slave->partner, 0, sizeof slave->partner);
 567
 568     slave->lacp->update = true;
 569     slave->status = LACP_DEFAULTED;
 570 }
 571
 572 static void
 573 slave_set_expired(struct slave *slave)
 574 {
 575     struct lacp *lacp = slave->lacp;
 576
 577     slave->status = LACP_EXPIRED;
 578     slave->partner.state |= LACP_STATE_TIME;
 579     slave->partner.state &= ~LACP_STATE_SYNC;
 580
 581     /* The spec says we should wait LACP_RX_MULTIPLIER * LACP_FAST_TIME_TX.
 582      * This doesn't make sense when using custom times which can be much
 583      * smaller than LACP_FAST_TIME. */
 584     timer_set_duration(&slave->rx, (lacp->lacp_time == LACP_TIME_CUSTOM
 585                                     ? lacp->custom_time
 586                                     : LACP_RX_MULTIPLIER * LACP_FAST_TIME_TX));
 587 }
 588
 589 static void
 590 slave_get_actor(struct slave *slave, struct lacp_info *actor)
 591 {
 592     struct lacp *lacp = slave->lacp;
 593     uint16_t key;
 594     uint8_t state = 0;
 595
 596     if (lacp->active) {
 597         state |= LACP_STATE_ACT;
 598     }
 599
 600     if (lacp->lacp_time != LACP_TIME_SLOW) {
 601         state |= LACP_STATE_TIME;
 602     }
 603
 604     if (slave->attached) {
 605         state |= LACP_STATE_SYNC;
 606     }
 607
 608     if (slave->status == LACP_DEFAULTED) {
 609         state |= LACP_STATE_DEF;
 610     }
 611
 612     if (slave->status == LACP_EXPIRED) {
 613         state |= LACP_STATE_EXP;
 614     }
 615
 616     if (lacp->heartbeat || hmap_count(&lacp->slaves) > 1) {
 617         state |= LACP_STATE_AGG;
 618     }
 619
 620     if (slave->attached || !lacp->negotiated) {
 621         state |= LACP_STATE_COL | LACP_STATE_DIST;
 622     }
 623
 624     key = lacp->key_slave->key;
 625     if (!key) {
 626         key = lacp->key_slave->port_id;
 627     }
 628
 629     actor->state = state;
 630     actor->key = htons(key);
 631     actor->port_priority = htons(slave->port_priority);
 632     actor->port_id = htons(slave->port_id);
 633     actor->sys_priority = htons(lacp->sys_priority);
 634     memcpy(&actor->sys_id, lacp->sys_id, ETH_ADDR_LEN);
 635 }
 636
 637 /* Given 'slave', populates 'priority' with data representing its LACP link
 638  * priority.  If two priority objects populated by this function are compared
 639  * using memcmp, the higher priority link will be less than the lower priority
 640  * link. */
 641 static void
 642 slave_get_priority(struct slave *slave, struct lacp_info *priority)
 643 {
 644     uint16_t partner_priority, actor_priority;
 645
 646     /* Choose the lacp_info of the higher priority system by comparing their
 647      * system priorities and mac addresses. */
 648     actor_priority = slave->lacp->sys_priority;
 649     partner_priority = ntohs(slave->partner.sys_priority);
 650     if (actor_priority < partner_priority) {
 651         slave_get_actor(slave, priority);
 652     } else if (partner_priority < actor_priority) {
 653         *priority = slave->partner;
 654     } else if (eth_addr_compare_3way(slave->lacp->sys_id,
 655                                      slave->partner.sys_id) < 0) {
 656         slave_get_actor(slave, priority);
 657     } else {
 658         *priority = slave->partner;
 659     }
 660
 661     /* Key and state are not used in priority comparisons. */
 662     priority->key = 0;
 663     priority->state = 0;
 664 }
 665
 666 static bool
 667 slave_may_tx(const struct slave *slave)
 668 {
 669     return slave->lacp->active || slave->status != LACP_DEFAULTED;
 670 }
 671
 672 static struct slave *
 673 slave_lookup(const struct lacp *lacp, const void *slave_)
 674 {
 675     struct slave *slave;
 676
 677     HMAP_FOR_EACH_IN_BUCKET (slave, node, hash_pointer(slave_, 0),
 678                              &lacp->slaves) {
 679         if (slave->aux == slave_) {
 680             return slave;
 681         }
 682     }
 683
 684     return NULL;
 685 }
 686
 687 /* Two lacp_info structures are tx_equal if and only if they do not differ in
 688  * ways which would require a lacp_pdu transmission. */
 689 static bool
 690 info_tx_equal(struct lacp_info *a, struct lacp_info *b)
 691 {
 692
 693     /* LACP specification dictates that we transmit whenever the actor and
 694      * remote_actor differ in the following fields: Port, Port Priority,
 695      * System, System Priority, Aggregation Key, Activity State, Timeout State,
 696      * Sync State, and Aggregation State. The state flags are most likely to
 697      * change so are checked first. */
 698     return !((a->state ^ b->state) & (LACP_STATE_ACT
 699                                       | LACP_STATE_TIME
 700                                       | LACP_STATE_SYNC
 701                                       | LACP_STATE_AGG))
 702         && a->port_id == b->port_id
 703         && a->port_priority == b->port_priority
 704         && a->key == b->key
 705         && a->sys_priority == b->sys_priority
 706         && eth_addr_equals(a->sys_id, b->sys_id);
 707 }
 708 \f
 709 static struct lacp *
 710 lacp_find(const char *name)
 711 {
 712     struct lacp *lacp;
 713
 714     LIST_FOR_EACH (lacp, node, &all_lacps) {
 715         if (!strcmp(lacp->name, name)) {
 716             return lacp;
 717         }
 718     }
 719
 720     return NULL;
 721 }
 722
 723 static void
 724 ds_put_lacp_state(struct ds *ds, uint8_t state)
 725 {
 726     if (state & LACP_STATE_ACT) {
 727         ds_put_cstr(ds, "activity ");
 728     }
 729
 730     if (state & LACP_STATE_TIME) {
 731         ds_put_cstr(ds, "timeout ");
 732     }
 733
 734     if (state & LACP_STATE_AGG) {
 735         ds_put_cstr(ds, "aggregation ");
 736     }
 737
 738     if (state & LACP_STATE_SYNC) {
 739         ds_put_cstr(ds, "synchronized ");
 740     }
 741
 742     if (state & LACP_STATE_COL) {
 743         ds_put_cstr(ds, "collecting ");
 744     }
 745
 746     if (state & LACP_STATE_DIST) {
 747         ds_put_cstr(ds, "distributing ");
 748     }
 749
 750     if (state & LACP_STATE_DEF) {
 751         ds_put_cstr(ds, "defaulted ");
 752     }
 753
 754     if (state & LACP_STATE_EXP) {
 755         ds_put_cstr(ds, "expired ");
 756     }
 757 }
 758
 759 static void
 760 lacp_unixctl_show(struct unixctl_conn *conn,
 761                   const char *args, void *aux OVS_UNUSED)
 762 {
 763     struct ds ds = DS_EMPTY_INITIALIZER;
 764     struct lacp *lacp;
 765     struct slave *slave;
 766
 767     lacp = lacp_find(args);
 768     if (!lacp) {
 769         unixctl_command_reply(conn, 501, "no such lacp object");
 770         return;
 771     }
 772
 773     ds_put_format(&ds, "lacp: %s\n", lacp->name);
 774
 775     ds_put_format(&ds, "\tstatus: %s", lacp->active ? "active" : "passive");
 776     if (lacp->heartbeat) {
 777         ds_put_cstr(&ds, " heartbeat");
 778     }
 779     if (lacp->negotiated) {
 780         ds_put_cstr(&ds, " negotiated");
 781     }
 782     ds_put_cstr(&ds, "\n");
 783
 784     ds_put_format(&ds, "\tsys_id: " ETH_ADDR_FMT "\n", ETH_ADDR_ARGS(lacp->sys_id));
 785     ds_put_format(&ds, "\tsys_priority: %u\n", lacp->sys_priority);
 786     ds_put_cstr(&ds, "\taggregation key: ");
 787     if (lacp->key_slave) {
 788         ds_put_format(&ds, "%u", lacp->key_slave->port_id);
 789     } else {
 790         ds_put_cstr(&ds, "none");
 791     }
 792     ds_put_cstr(&ds, "\n");
 793
 794     ds_put_cstr(&ds, "\tlacp_time: ");
 795     switch (lacp->lacp_time) {
 796     case LACP_TIME_FAST:
 797         ds_put_cstr(&ds, "fast\n");
 798         break;
 799     case LACP_TIME_SLOW:
 800         ds_put_cstr(&ds, "slow\n");
 801         break;
 802     case LACP_TIME_CUSTOM:
 803         ds_put_format(&ds, "custom (%lld)\n", lacp->custom_time);
 804         break;
 805     default:
 806         ds_put_cstr(&ds, "unknown\n");
 807     }
 808
 809     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 810         char *status;
 811         struct lacp_info actor;
 812
 813         slave_get_actor(slave, &actor);
 814         switch (slave->status) {
 815         case LACP_CURRENT:
 816             status = "current";
 817             break;
 818         case LACP_EXPIRED:
 819             status = "expired";
 820             break;
 821         case LACP_DEFAULTED:
 822             status = "defaulted";
 823             break;
 824         default:
 825             NOT_REACHED();
 826         }
 827
 828         ds_put_format(&ds, "\nslave: %s: %s %s\n", slave->name, status,
 829                       slave->attached ? "attached" : "detached");
 830         ds_put_format(&ds, "\tport_id: %u\n", slave->port_id);
 831         ds_put_format(&ds, "\tport_priority: %u\n", slave->port_priority);
 832
 833         ds_put_format(&ds, "\n\tactor sys_id: " ETH_ADDR_FMT "\n",
 834                       ETH_ADDR_ARGS(actor.sys_id));
 835         ds_put_format(&ds, "\tactor sys_priority: %u\n",
 836                       ntohs(actor.sys_priority));
 837         ds_put_format(&ds, "\tactor port_id: %u\n",
 838                       ntohs(actor.port_id));
 839         ds_put_format(&ds, "\tactor port_priority: %u\n",
 840                       ntohs(actor.port_priority));
 841         ds_put_format(&ds, "\tactor key: %u\n",
 842                       ntohs(actor.key));
 843         ds_put_cstr(&ds, "\tactor state: ");
 844         ds_put_lacp_state(&ds, actor.state);
 845         ds_put_cstr(&ds, "\n\n");
 846
 847         ds_put_format(&ds, "\tpartner sys_id: " ETH_ADDR_FMT "\n",
 848                       ETH_ADDR_ARGS(slave->partner.sys_id));
 849         ds_put_format(&ds, "\tpartner sys_priority: %u\n",
 850                       ntohs(slave->partner.sys_priority));
 851         ds_put_format(&ds, "\tpartner port_id: %u\n",
 852                       ntohs(slave->partner.port_id));
 853         ds_put_format(&ds, "\tpartner port_priority: %u\n",
 854                       ntohs(slave->partner.port_priority));
 855         ds_put_format(&ds, "\tpartner key: %u\n",
 856                       ntohs(slave->partner.key));
 857         ds_put_cstr(&ds, "\tpartner state: ");
 858         ds_put_lacp_state(&ds, slave->partner.state);
 859         ds_put_cstr(&ds, "\n");
 860     }
 861
 862     unixctl_command_reply(conn, 200, ds_cstr(&ds));
 863     ds_destroy(&ds);
 864 }