lib/lacp.c

   1 /* Copyright (c) 2011, 2012 Nicira, Inc.
   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 <stdlib.h>
  20
  21 #include "dynamic-string.h"
  22 #include "hash.h"
  23 #include "hmap.h"
  24 #include "ofpbuf.h"
  25 #include "packets.h"
  26 #include "poll-loop.h"
  27 #include "shash.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 OVS_PACKED(
  51 struct lacp_info {
  52     ovs_be16 sys_priority;            /* System priority. */
  53     uint8_t sys_id[ETH_ADDR_LEN];     /* System ID. */
  54     ovs_be16 key;                     /* Operational key. */
  55     ovs_be16 port_priority;           /* Port priority. */
  56     ovs_be16 port_id;                 /* Port ID. */
  57     uint8_t state;                    /* State mask.  See LACP_STATE macros. */
  58 });
  59 BUILD_ASSERT_DECL(LACP_INFO_LEN == sizeof(struct lacp_info));
  60
  61 #define LACP_PDU_LEN 110
  62 OVS_PACKED(
  63 struct lacp_pdu {
  64     uint8_t subtype;          /* Always 1. */
  65     uint8_t version;          /* Always 1. */
  66
  67     uint8_t actor_type;       /* Always 1. */
  68     uint8_t actor_len;        /* Always 20. */
  69     struct lacp_info actor;   /* LACP actor information. */
  70     uint8_t z1[3];            /* Reserved.  Always 0. */
  71
  72     uint8_t partner_type;     /* Always 2. */
  73     uint8_t partner_len;      /* Always 20. */
  74     struct lacp_info partner; /* LACP partner information. */
  75     uint8_t z2[3];            /* Reserved.  Always 0. */
  76
  77     uint8_t collector_type;   /* Always 3. */
  78     uint8_t collector_len;    /* Always 16. */
  79     ovs_be16 collector_delay; /* Maximum collector delay. Set to UINT16_MAX. */
  80     uint8_t z3[64];           /* Combination of several fields.  Always 0. */
  81 });
  82 BUILD_ASSERT_DECL(LACP_PDU_LEN == sizeof(struct lacp_pdu));
  83 \f
  84 /* Implementation. */
  85
  86 enum slave_status {
  87     LACP_CURRENT,   /* Current State.  Partner up to date. */
  88     LACP_EXPIRED,   /* Expired State.  Partner out of date. */
  89     LACP_DEFAULTED, /* Defaulted State.  No partner. */
  90 };
  91
  92 struct lacp {
  93     struct list node;             /* Node in all_lacps list. */
  94     char *name;                   /* Name of this lacp object. */
  95     uint8_t sys_id[ETH_ADDR_LEN]; /* System ID. */
  96     uint16_t sys_priority;        /* System Priority. */
  97     bool active;                  /* Active or Passive. */
  98
  99     struct hmap slaves;      /* Slaves this LACP object controls. */
 100     struct slave *key_slave; /* Slave whose ID will be the aggregation key. */
 101
 102     bool fast;               /* True if using fast probe interval. */
 103     bool negotiated;         /* True if LACP negotiations were successful. */
 104     bool update;             /* True if lacp_update() needs to be called. */
 105
 106     int ref_cnt;
 107 };
 108
 109 struct slave {
 110     void *aux;                    /* Handle used to identify this slave. */
 111     struct hmap_node node;        /* Node in master's slaves map. */
 112
 113     struct lacp *lacp;            /* LACP object containing this slave. */
 114     uint16_t port_id;             /* Port ID. */
 115     uint16_t port_priority;       /* Port Priority. */
 116     uint16_t key;                 /* Aggregation Key. 0 if default. */
 117     char *name;                   /* Name of this slave. */
 118
 119     enum slave_status status;     /* Slave status. */
 120     bool attached;                /* Attached. Traffic may flow. */
 121     struct lacp_info partner;     /* Partner information. */
 122     struct lacp_info ntt_actor;   /* Used to decide if we Need To Transmit. */
 123     struct timer tx;              /* Next message transmission timer. */
 124     struct timer rx;              /* Expected message receive timer. */
 125 };
 126
 127 static struct list all_lacps = LIST_INITIALIZER(&all_lacps);
 128
 129 static void lacp_update_attached(struct lacp *);
 130
 131 static void slave_destroy(struct slave *);
 132 static void slave_set_defaulted(struct slave *);
 133 static void slave_set_expired(struct slave *);
 134 static void slave_get_actor(struct slave *, struct lacp_info *actor);
 135 static void slave_get_priority(struct slave *, struct lacp_info *priority);
 136 static bool slave_may_tx(const struct slave *);
 137 static struct slave *slave_lookup(const struct lacp *, const void *slave);
 138 static bool info_tx_equal(struct lacp_info *, struct lacp_info *);
 139
 140 static unixctl_cb_func lacp_unixctl_show;
 141
 142 /* Populates 'pdu' with a LACP PDU comprised of 'actor' and 'partner'. */
 143 static void
 144 compose_lacp_pdu(const struct lacp_info *actor,
 145                  const struct lacp_info *partner, struct lacp_pdu *pdu)
 146 {
 147     memset(pdu, 0, sizeof *pdu);
 148
 149     pdu->subtype = 1;
 150     pdu->version = 1;
 151
 152     pdu->actor_type = 1;
 153     pdu->actor_len = 20;
 154     pdu->actor = *actor;
 155
 156     pdu->partner_type = 2;
 157     pdu->partner_len = 20;
 158     pdu->partner = *partner;
 159
 160     pdu->collector_type = 3;
 161     pdu->collector_len = 16;
 162     pdu->collector_delay = htons(0);
 163 }
 164
 165 /* Parses 'b' which represents a packet containing a LACP PDU.  This function
 166  * returns NULL if 'b' is malformed, or does not represent a LACP PDU format
 167  * supported by OVS.  Otherwise, it returns a pointer to the lacp_pdu contained
 168  * within 'b'. */
 169 static const struct lacp_pdu *
 170 parse_lacp_packet(const struct ofpbuf *b)
 171 {
 172     const struct lacp_pdu *pdu;
 173
 174     pdu = ofpbuf_at(b, (uint8_t *)b->l3 - (uint8_t *)b->data, LACP_PDU_LEN);
 175
 176     if (pdu && pdu->subtype == 1
 177         && pdu->actor_type == 1 && pdu->actor_len == 20
 178         && pdu->partner_type == 2 && pdu->partner_len == 20) {
 179         return pdu;
 180     } else {
 181         return NULL;
 182     }
 183 }
 184 \f
 185 /* LACP Protocol Implementation. */
 186
 187 /* Initializes the lacp module. */
 188 void
 189 lacp_init(void)
 190 {
 191     unixctl_command_register("lacp/show", "[port]", 0, 1,
 192                              lacp_unixctl_show, NULL);
 193 }
 194
 195 /* Creates a LACP object. */
 196 struct lacp *
 197 lacp_create(void)
 198 {
 199     struct lacp *lacp;
 200
 201     lacp = xzalloc(sizeof *lacp);
 202     hmap_init(&lacp->slaves);
 203     list_push_back(&all_lacps, &lacp->node);
 204     lacp->ref_cnt = 1;
 205     return lacp;
 206 }
 207
 208 struct lacp *
 209 lacp_ref(const struct lacp *lacp_)
 210 {
 211     struct lacp *lacp = CONST_CAST(struct lacp *, lacp_);
 212     if (lacp) {
 213         ovs_assert(lacp->ref_cnt > 0);
 214         lacp->ref_cnt++;
 215     }
 216     return lacp;
 217 }
 218
 219 /* Destroys 'lacp' and its slaves. Does nothing if 'lacp' is NULL. */
 220 void
 221 lacp_unref(struct lacp *lacp)
 222 {
 223     if (!lacp) {
 224         return;
 225     }
 226
 227     ovs_assert(lacp->ref_cnt > 0);
 228     if (!--lacp->ref_cnt) {
 229         struct slave *slave, *next;
 230
 231         HMAP_FOR_EACH_SAFE (slave, next, node, &lacp->slaves) {
 232             slave_destroy(slave);
 233         }
 234
 235         hmap_destroy(&lacp->slaves);
 236         list_remove(&lacp->node);
 237         free(lacp->name);
 238         free(lacp);
 239     }
 240 }
 241
 242 /* Configures 'lacp' with settings from 's'. */
 243 void
 244 lacp_configure(struct lacp *lacp, const struct lacp_settings *s)
 245 {
 246     ovs_assert(!eth_addr_is_zero(s->id));
 247
 248     if (!lacp->name || strcmp(s->name, lacp->name)) {
 249         free(lacp->name);
 250         lacp->name = xstrdup(s->name);
 251     }
 252
 253     if (!eth_addr_equals(lacp->sys_id, s->id)
 254         || lacp->sys_priority != s->priority) {
 255         memcpy(lacp->sys_id, s->id, ETH_ADDR_LEN);
 256         lacp->sys_priority = s->priority;
 257         lacp->update = true;
 258     }
 259
 260     lacp->active = s->active;
 261     lacp->fast = s->fast;
 262 }
 263
 264 /* Returns true if 'lacp' is configured in active mode, false if 'lacp' is
 265  * configured for passive mode. */
 266 bool
 267 lacp_is_active(const struct lacp *lacp)
 268 {
 269     return lacp->active;
 270 }
 271
 272 /* Processes 'packet' which was received on 'slave_'.  This function should be
 273  * called on all packets received on 'slave_' with Ethernet Type ETH_TYPE_LACP.
 274  */
 275 void
 276 lacp_process_packet(struct lacp *lacp, const void *slave_,
 277                     const struct ofpbuf *packet)
 278 {
 279     static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
 280     struct slave *slave = slave_lookup(lacp, slave_);
 281     const struct lacp_pdu *pdu;
 282     long long int tx_rate;
 283
 284     if (!slave) {
 285         return;
 286     }
 287
 288     pdu = parse_lacp_packet(packet);
 289     if (!pdu) {
 290         VLOG_WARN_RL(&rl, "%s: received an unparsable LACP PDU.", lacp->name);
 291         return;
 292     }
 293
 294     slave->status = LACP_CURRENT;
 295     tx_rate = lacp->fast ? LACP_FAST_TIME_TX : LACP_SLOW_TIME_TX;
 296     timer_set_duration(&slave->rx, LACP_RX_MULTIPLIER * tx_rate);
 297
 298     slave->ntt_actor = pdu->partner;
 299
 300     /* Update our information about our partner if it's out of date.  This may
 301      * cause priorities to change so re-calculate attached status of all
 302      * slaves.  */
 303     if (memcmp(&slave->partner, &pdu->actor, sizeof pdu->actor)) {
 304         lacp->update = true;
 305         slave->partner = pdu->actor;
 306     }
 307 }
 308
 309 /* Returns the lacp_status of the given 'lacp' object (which may be NULL). */
 310 enum lacp_status
 311 lacp_status(const struct lacp *lacp)
 312 {
 313     if (!lacp) {
 314         return LACP_DISABLED;
 315     } else if (lacp->negotiated) {
 316         return LACP_NEGOTIATED;
 317     } else {
 318         return LACP_CONFIGURED;
 319     }
 320 }
 321
 322 /* Registers 'slave_' as subordinate to 'lacp'.  This should be called at least
 323  * once per slave in a LACP managed bond.  Should also be called whenever a
 324  * slave's settings change. */
 325 void
 326 lacp_slave_register(struct lacp *lacp, void *slave_,
 327                     const struct lacp_slave_settings *s)
 328 {
 329     struct slave *slave = slave_lookup(lacp, slave_);
 330
 331     if (!slave) {
 332         slave = xzalloc(sizeof *slave);
 333         slave->lacp = lacp;
 334         slave->aux = slave_;
 335         hmap_insert(&lacp->slaves, &slave->node, hash_pointer(slave_, 0));
 336         slave_set_defaulted(slave);
 337
 338         if (!lacp->key_slave) {
 339             lacp->key_slave = slave;
 340         }
 341     }
 342
 343     if (!slave->name || strcmp(s->name, slave->name)) {
 344         free(slave->name);
 345         slave->name = xstrdup(s->name);
 346     }
 347
 348     if (slave->port_id != s->id
 349         || slave->port_priority != s->priority
 350         || slave->key != s->key) {
 351         slave->port_id = s->id;
 352         slave->port_priority = s->priority;
 353         slave->key = s->key;
 354
 355         lacp->update = true;
 356
 357         if (lacp->active || lacp->negotiated) {
 358             slave_set_expired(slave);
 359         }
 360     }
 361 }
 362
 363 /* Unregisters 'slave_' with 'lacp'.  */
 364 void
 365 lacp_slave_unregister(struct lacp *lacp, const void *slave_)
 366 {
 367     struct slave *slave = slave_lookup(lacp, slave_);
 368
 369     if (slave) {
 370         slave_destroy(slave);
 371         lacp->update = true;
 372     }
 373 }
 374
 375 /* This function should be called whenever the carrier status of 'slave_' has
 376  * changed.  If 'lacp' is null, this function has no effect.*/
 377 void
 378 lacp_slave_carrier_changed(const struct lacp *lacp, const void *slave_)
 379 {
 380     if (lacp) {
 381         struct slave *slave = slave_lookup(lacp, slave_);
 382
 383         if (!slave) {
 384             return;
 385         }
 386
 387         if (slave->status == LACP_CURRENT || slave->lacp->active) {
 388             slave_set_expired(slave);
 389         }
 390     }
 391 }
 392
 393 static bool
 394 slave_may_enable__(struct slave *slave)
 395 {
 396     /* The slave may be enabled if it's attached to an aggregator and its
 397      * partner is synchronized.*/
 398     return slave->attached && (slave->partner.state & LACP_STATE_SYNC);
 399 }
 400
 401 /* This function should be called before enabling 'slave_' to send or receive
 402  * traffic.  If it returns false, 'slave_' should not enabled.  As a
 403  * convenience, returns true if 'lacp' is NULL. */
 404 bool
 405 lacp_slave_may_enable(const struct lacp *lacp, const void *slave_)
 406 {
 407     if (lacp) {
 408         struct slave *slave = slave_lookup(lacp, slave_);
 409         return slave ? slave_may_enable__(slave) : false;
 410     } else {
 411         return true;
 412     }
 413 }
 414
 415 /* Returns true if partner information on 'slave_' is up to date.  'slave_'
 416  * not being current, generally indicates a connectivity problem, or a
 417  * misconfigured (or broken) partner. */
 418 bool
 419 lacp_slave_is_current(const struct lacp *lacp, const void *slave_)
 420 {
 421     struct slave *slave = slave_lookup(lacp, slave_);
 422     return slave ? slave->status != LACP_DEFAULTED : false;
 423 }
 424
 425 /* This function should be called periodically to update 'lacp'. */
 426 void
 427 lacp_run(struct lacp *lacp, lacp_send_pdu *send_pdu)
 428 {
 429     struct slave *slave;
 430
 431     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 432         if (timer_expired(&slave->rx)) {
 433             if (slave->status == LACP_CURRENT) {
 434                 slave_set_expired(slave);
 435             } else if (slave->status == LACP_EXPIRED) {
 436                 slave_set_defaulted(slave);
 437             }
 438         }
 439     }
 440
 441     if (lacp->update) {
 442         lacp_update_attached(lacp);
 443     }
 444
 445     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 446         struct lacp_info actor;
 447
 448         if (!slave_may_tx(slave)) {
 449             continue;
 450         }
 451
 452         slave_get_actor(slave, &actor);
 453
 454         if (timer_expired(&slave->tx)
 455             || !info_tx_equal(&actor, &slave->ntt_actor)) {
 456             long long int duration;
 457             struct lacp_pdu pdu;
 458
 459             slave->ntt_actor = actor;
 460             compose_lacp_pdu(&actor, &slave->partner, &pdu);
 461             send_pdu(slave->aux, &pdu, sizeof pdu);
 462
 463             duration = (slave->partner.state & LACP_STATE_TIME
 464                         ? LACP_FAST_TIME_TX
 465                         : LACP_SLOW_TIME_TX);
 466
 467             timer_set_duration(&slave->tx, duration);
 468         }
 469     }
 470 }
 471
 472 /* Causes poll_block() to wake up when lacp_run() needs to be called again. */
 473 void
 474 lacp_wait(struct lacp *lacp)
 475 {
 476     struct slave *slave;
 477
 478     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 479         if (slave_may_tx(slave)) {
 480             timer_wait(&slave->tx);
 481         }
 482
 483         if (slave->status != LACP_DEFAULTED) {
 484             timer_wait(&slave->rx);
 485         }
 486     }
 487 }
 488 \f
 489 /* Static Helpers. */
 490
 491 /* Updates the attached status of all slaves controlled by 'lacp' and sets its
 492  * negotiated parameter to true if any slaves are attachable. */
 493 static void
 494 lacp_update_attached(struct lacp *lacp)
 495 {
 496     struct slave *lead, *slave;
 497     struct lacp_info lead_pri;
 498     static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 10);
 499
 500     lacp->update = false;
 501
 502     lead = NULL;
 503     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 504         struct lacp_info pri;
 505
 506         slave->attached = false;
 507
 508         /* XXX: In the future allow users to configure the expected system ID.
 509          * For now just special case loopback. */
 510         if (eth_addr_equals(slave->partner.sys_id, slave->lacp->sys_id)) {
 511             VLOG_WARN_RL(&rl, "slave %s: Loopback detected. Slave is "
 512                          "connected to its own bond", slave->name);
 513             continue;
 514         }
 515
 516         if (slave->status == LACP_DEFAULTED) {
 517             continue;
 518         }
 519
 520         slave->attached = true;
 521         slave_get_priority(slave, &pri);
 522
 523         if (!lead || memcmp(&pri, &lead_pri, sizeof pri) < 0) {
 524             lead = slave;
 525             lead_pri = pri;
 526         }
 527     }
 528
 529     lacp->negotiated = lead != NULL;
 530
 531     if (lead) {
 532         HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 533             if (lead->partner.key != slave->partner.key
 534                 || !eth_addr_equals(lead->partner.sys_id,
 535                                     slave->partner.sys_id)) {
 536                 slave->attached = false;
 537             }
 538         }
 539     }
 540 }
 541
 542 static void
 543 slave_destroy(struct slave *slave)
 544 {
 545     if (slave) {
 546         struct lacp *lacp = slave->lacp;
 547
 548         lacp->update = true;
 549         hmap_remove(&lacp->slaves, &slave->node);
 550
 551         if (lacp->key_slave == slave) {
 552             struct hmap_node *slave_node = hmap_first(&lacp->slaves);
 553
 554             if (slave_node) {
 555                 lacp->key_slave = CONTAINER_OF(slave_node, struct slave, node);
 556             } else {
 557                 lacp->key_slave = NULL;
 558             }
 559         }
 560
 561         free(slave->name);
 562         free(slave);
 563     }
 564 }
 565
 566 static void
 567 slave_set_defaulted(struct slave *slave)
 568 {
 569     memset(&slave->partner, 0, sizeof slave->partner);
 570
 571     slave->lacp->update = true;
 572     slave->status = LACP_DEFAULTED;
 573 }
 574
 575 static void
 576 slave_set_expired(struct slave *slave)
 577 {
 578     slave->status = LACP_EXPIRED;
 579     slave->partner.state |= LACP_STATE_TIME;
 580     slave->partner.state &= ~LACP_STATE_SYNC;
 581
 582     timer_set_duration(&slave->rx, LACP_RX_MULTIPLIER * LACP_FAST_TIME_TX);
 583 }
 584
 585 static void
 586 slave_get_actor(struct slave *slave, struct lacp_info *actor)
 587 {
 588     struct lacp *lacp = slave->lacp;
 589     uint16_t key;
 590     uint8_t state = 0;
 591
 592     if (lacp->active) {
 593         state |= LACP_STATE_ACT;
 594     }
 595
 596     if (lacp->fast) {
 597         state |= LACP_STATE_TIME;
 598     }
 599
 600     if (slave->attached) {
 601         state |= LACP_STATE_SYNC;
 602     }
 603
 604     if (slave->status == LACP_DEFAULTED) {
 605         state |= LACP_STATE_DEF;
 606     }
 607
 608     if (slave->status == LACP_EXPIRED) {
 609         state |= LACP_STATE_EXP;
 610     }
 611
 612     if (hmap_count(&lacp->slaves) > 1) {
 613         state |= LACP_STATE_AGG;
 614     }
 615
 616     if (slave->attached || !lacp->negotiated) {
 617         state |= LACP_STATE_COL | LACP_STATE_DIST;
 618     }
 619
 620     key = lacp->key_slave->key;
 621     if (!key) {
 622         key = lacp->key_slave->port_id;
 623     }
 624
 625     actor->state = state;
 626     actor->key = htons(key);
 627     actor->port_priority = htons(slave->port_priority);
 628     actor->port_id = htons(slave->port_id);
 629     actor->sys_priority = htons(lacp->sys_priority);
 630     memcpy(&actor->sys_id, lacp->sys_id, ETH_ADDR_LEN);
 631 }
 632
 633 /* Given 'slave', populates 'priority' with data representing its LACP link
 634  * priority.  If two priority objects populated by this function are compared
 635  * using memcmp, the higher priority link will be less than the lower priority
 636  * link. */
 637 static void
 638 slave_get_priority(struct slave *slave, struct lacp_info *priority)
 639 {
 640     uint16_t partner_priority, actor_priority;
 641
 642     /* Choose the lacp_info of the higher priority system by comparing their
 643      * system priorities and mac addresses. */
 644     actor_priority = slave->lacp->sys_priority;
 645     partner_priority = ntohs(slave->partner.sys_priority);
 646     if (actor_priority < partner_priority) {
 647         slave_get_actor(slave, priority);
 648     } else if (partner_priority < actor_priority) {
 649         *priority = slave->partner;
 650     } else if (eth_addr_compare_3way(slave->lacp->sys_id,
 651                                      slave->partner.sys_id) < 0) {
 652         slave_get_actor(slave, priority);
 653     } else {
 654         *priority = slave->partner;
 655     }
 656
 657     /* Key and state are not used in priority comparisons. */
 658     priority->key = 0;
 659     priority->state = 0;
 660 }
 661
 662 static bool
 663 slave_may_tx(const struct slave *slave)
 664 {
 665     return slave->lacp->active || slave->status != LACP_DEFAULTED;
 666 }
 667
 668 static struct slave *
 669 slave_lookup(const struct lacp *lacp, const void *slave_)
 670 {
 671     struct slave *slave;
 672
 673     HMAP_FOR_EACH_IN_BUCKET (slave, node, hash_pointer(slave_, 0),
 674                              &lacp->slaves) {
 675         if (slave->aux == slave_) {
 676             return slave;
 677         }
 678     }
 679
 680     return NULL;
 681 }
 682
 683 /* Two lacp_info structures are tx_equal if and only if they do not differ in
 684  * ways which would require a lacp_pdu transmission. */
 685 static bool
 686 info_tx_equal(struct lacp_info *a, struct lacp_info *b)
 687 {
 688
 689     /* LACP specification dictates that we transmit whenever the actor and
 690      * remote_actor differ in the following fields: Port, Port Priority,
 691      * System, System Priority, Aggregation Key, Activity State, Timeout State,
 692      * Sync State, and Aggregation State. The state flags are most likely to
 693      * change so are checked first. */
 694     return !((a->state ^ b->state) & (LACP_STATE_ACT
 695                                       | LACP_STATE_TIME
 696                                       | LACP_STATE_SYNC
 697                                       | LACP_STATE_AGG))
 698         && a->port_id == b->port_id
 699         && a->port_priority == b->port_priority
 700         && a->key == b->key
 701         && a->sys_priority == b->sys_priority
 702         && eth_addr_equals(a->sys_id, b->sys_id);
 703 }
 704 \f
 705 static struct lacp *
 706 lacp_find(const char *name)
 707 {
 708     struct lacp *lacp;
 709
 710     LIST_FOR_EACH (lacp, node, &all_lacps) {
 711         if (!strcmp(lacp->name, name)) {
 712             return lacp;
 713         }
 714     }
 715
 716     return NULL;
 717 }
 718
 719 static void
 720 ds_put_lacp_state(struct ds *ds, uint8_t state)
 721 {
 722     if (state & LACP_STATE_ACT) {
 723         ds_put_cstr(ds, " activity");
 724     }
 725
 726     if (state & LACP_STATE_TIME) {
 727         ds_put_cstr(ds, " timeout");
 728     }
 729
 730     if (state & LACP_STATE_AGG) {
 731         ds_put_cstr(ds, " aggregation");
 732     }
 733
 734     if (state & LACP_STATE_SYNC) {
 735         ds_put_cstr(ds, " synchronized");
 736     }
 737
 738     if (state & LACP_STATE_COL) {
 739         ds_put_cstr(ds, " collecting");
 740     }
 741
 742     if (state & LACP_STATE_DIST) {
 743         ds_put_cstr(ds, " distributing");
 744     }
 745
 746     if (state & LACP_STATE_DEF) {
 747         ds_put_cstr(ds, " defaulted");
 748     }
 749
 750     if (state & LACP_STATE_EXP) {
 751         ds_put_cstr(ds, " expired");
 752     }
 753 }
 754
 755 static void
 756 lacp_print_details(struct ds *ds, struct lacp *lacp)
 757 {
 758     struct shash slave_shash = SHASH_INITIALIZER(&slave_shash);
 759     const struct shash_node **sorted_slaves = NULL;
 760
 761     struct slave *slave;
 762     int i;
 763
 764     ds_put_format(ds, "---- %s ----\n", lacp->name);
 765     ds_put_format(ds, "\tstatus: %s", lacp->active ? "active" : "passive");
 766     if (lacp->negotiated) {
 767         ds_put_cstr(ds, " negotiated");
 768     }
 769     ds_put_cstr(ds, "\n");
 770
 771     ds_put_format(ds, "\tsys_id: " ETH_ADDR_FMT "\n", ETH_ADDR_ARGS(lacp->sys_id));
 772     ds_put_format(ds, "\tsys_priority: %u\n", lacp->sys_priority);
 773     ds_put_cstr(ds, "\taggregation key: ");
 774     if (lacp->key_slave) {
 775         ds_put_format(ds, "%u", lacp->key_slave->key
 776                                 ? lacp->key_slave->key
 777                                 : lacp->key_slave->port_id);
 778     } else {
 779         ds_put_cstr(ds, "none");
 780     }
 781     ds_put_cstr(ds, "\n");
 782
 783     ds_put_cstr(ds, "\tlacp_time: ");
 784     if (lacp->fast) {
 785         ds_put_cstr(ds, "fast\n");
 786     } else {
 787         ds_put_cstr(ds, "slow\n");
 788     }
 789
 790     HMAP_FOR_EACH (slave, node, &lacp->slaves) {
 791         shash_add(&slave_shash, slave->name, slave);
 792     }
 793     sorted_slaves = shash_sort(&slave_shash);
 794
 795     for (i = 0; i < shash_count(&slave_shash); i++) {
 796         char *status;
 797         struct lacp_info actor;
 798
 799         slave = sorted_slaves[i]->data;
 800         slave_get_actor(slave, &actor);
 801         switch (slave->status) {
 802         case LACP_CURRENT:
 803             status = "current";
 804             break;
 805         case LACP_EXPIRED:
 806             status = "expired";
 807             break;
 808         case LACP_DEFAULTED:
 809             status = "defaulted";
 810             break;
 811         default:
 812             NOT_REACHED();
 813         }
 814
 815         ds_put_format(ds, "\nslave: %s: %s %s\n", slave->name, status,
 816                       slave->attached ? "attached" : "detached");
 817         ds_put_format(ds, "\tport_id: %u\n", slave->port_id);
 818         ds_put_format(ds, "\tport_priority: %u\n", slave->port_priority);
 819         ds_put_format(ds, "\tmay_enable: %s\n", (slave_may_enable__(slave)
 820                                                  ? "true" : "false"));
 821
 822         ds_put_format(ds, "\n\tactor sys_id: " ETH_ADDR_FMT "\n",
 823                       ETH_ADDR_ARGS(actor.sys_id));
 824         ds_put_format(ds, "\tactor sys_priority: %u\n",
 825                       ntohs(actor.sys_priority));
 826         ds_put_format(ds, "\tactor port_id: %u\n",
 827                       ntohs(actor.port_id));
 828         ds_put_format(ds, "\tactor port_priority: %u\n",
 829                       ntohs(actor.port_priority));
 830         ds_put_format(ds, "\tactor key: %u\n",
 831                       ntohs(actor.key));
 832         ds_put_cstr(ds, "\tactor state:");
 833         ds_put_lacp_state(ds, actor.state);
 834         ds_put_cstr(ds, "\n\n");
 835
 836         ds_put_format(ds, "\tpartner sys_id: " ETH_ADDR_FMT "\n",
 837                       ETH_ADDR_ARGS(slave->partner.sys_id));
 838         ds_put_format(ds, "\tpartner sys_priority: %u\n",
 839                       ntohs(slave->partner.sys_priority));
 840         ds_put_format(ds, "\tpartner port_id: %u\n",
 841                       ntohs(slave->partner.port_id));
 842         ds_put_format(ds, "\tpartner port_priority: %u\n",
 843                       ntohs(slave->partner.port_priority));
 844         ds_put_format(ds, "\tpartner key: %u\n",
 845                       ntohs(slave->partner.key));
 846         ds_put_cstr(ds, "\tpartner state:");
 847         ds_put_lacp_state(ds, slave->partner.state);
 848         ds_put_cstr(ds, "\n");
 849     }
 850
 851     shash_destroy(&slave_shash);
 852     free(sorted_slaves);
 853 }
 854
 855 static void
 856 lacp_unixctl_show(struct unixctl_conn *conn, int argc, const char *argv[],
 857                   void *aux OVS_UNUSED)
 858 {
 859     struct ds ds = DS_EMPTY_INITIALIZER;
 860     struct lacp *lacp;
 861
 862     if (argc > 1) {
 863         lacp = lacp_find(argv[1]);
 864         if (!lacp) {
 865             unixctl_command_reply_error(conn, "no such lacp object");
 866             return;
 867         }
 868         lacp_print_details(&ds, lacp);
 869     } else {
 870         LIST_FOR_EACH (lacp, node, &all_lacps) {
 871             lacp_print_details(&ds, lacp);
 872         }
 873     }
 874
 875     unixctl_command_reply(conn, ds_cstr(&ds));
 876     ds_destroy(&ds);
 877 }