lnet/lnet/lib-msg.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lnet/lnet/lib-msg.c
  32  *
  33  * Message decoding, parsing and finalizing routines
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_LNET
  37
  38 #include <lnet/lib-lnet.h>
  39
  40 void
  41 lnet_build_unlink_event(struct lnet_libmd *md, struct lnet_event *ev)
  42 {
  43         ENTRY;
  44
  45         memset(ev, 0, sizeof(*ev));
  46
  47         ev->status   = 0;
  48         ev->unlinked = 1;
  49         ev->type     = LNET_EVENT_UNLINK;
  50         lnet_md_deconstruct(md, ev);
  51         lnet_md2handle(&ev->md_handle, md);
  52         EXIT;
  53 }
  54
  55 /*
  56  * Don't need any lock, must be called after lnet_commit_md
  57  */
  58 void
  59 lnet_build_msg_event(struct lnet_msg *msg, enum lnet_event_kind ev_type)
  60 {
  61         struct lnet_hdr *hdr = &msg->msg_hdr;
  62         struct lnet_event *ev = &msg->msg_ev;
  63
  64         LASSERT(!msg->msg_routing);
  65
  66         ev->type = ev_type;
  67         ev->msg_type = msg->msg_type;
  68
  69         if (ev_type == LNET_EVENT_SEND) {
  70                 /* event for active message */
  71                 ev->target.nid    = le64_to_cpu(hdr->dest_nid);
  72                 ev->target.pid    = le32_to_cpu(hdr->dest_pid);
  73                 ev->initiator.nid = LNET_NID_ANY;
  74                 ev->initiator.pid = the_lnet.ln_pid;
  75                 ev->source.nid    = LNET_NID_ANY;
  76                 ev->source.pid    = the_lnet.ln_pid;
  77                 ev->sender        = LNET_NID_ANY;
  78         } else {
  79                 /* event for passive message */
  80                 ev->target.pid    = hdr->dest_pid;
  81                 ev->target.nid    = hdr->dest_nid;
  82                 ev->initiator.pid = hdr->src_pid;
  83                 /* Multi-Rail: resolve src_nid to "primary" peer NID */
  84                 ev->initiator.nid = msg->msg_initiator;
  85                 /* Multi-Rail: track source NID. */
  86                 ev->source.pid    = hdr->src_pid;
  87                 ev->source.nid    = hdr->src_nid;
  88                 ev->rlength       = hdr->payload_length;
  89                 ev->sender        = msg->msg_from;
  90                 ev->mlength       = msg->msg_wanted;
  91                 ev->offset        = msg->msg_offset;
  92         }
  93
  94         switch (ev_type) {
  95         default:
  96                 LBUG();
  97
  98         case LNET_EVENT_PUT: /* passive PUT */
  99                 ev->pt_index   = hdr->msg.put.ptl_index;
 100                 ev->match_bits = hdr->msg.put.match_bits;
 101                 ev->hdr_data   = hdr->msg.put.hdr_data;
 102                 return;
 103
 104         case LNET_EVENT_GET: /* passive GET */
 105                 ev->pt_index   = hdr->msg.get.ptl_index;
 106                 ev->match_bits = hdr->msg.get.match_bits;
 107                 ev->hdr_data   = 0;
 108                 return;
 109
 110         case LNET_EVENT_ACK: /* ACK */
 111                 ev->match_bits = hdr->msg.ack.match_bits;
 112                 ev->mlength    = hdr->msg.ack.mlength;
 113                 return;
 114
 115         case LNET_EVENT_REPLY: /* REPLY */
 116                 return;
 117
 118         case LNET_EVENT_SEND: /* active message */
 119                 if (msg->msg_type == LNET_MSG_PUT) {
 120                         ev->pt_index   = le32_to_cpu(hdr->msg.put.ptl_index);
 121                         ev->match_bits = le64_to_cpu(hdr->msg.put.match_bits);
 122                         ev->offset     = le32_to_cpu(hdr->msg.put.offset);
 123                         ev->mlength    =
 124                         ev->rlength    = le32_to_cpu(hdr->payload_length);
 125                         ev->hdr_data   = le64_to_cpu(hdr->msg.put.hdr_data);
 126
 127                 } else {
 128                         LASSERT(msg->msg_type == LNET_MSG_GET);
 129                         ev->pt_index   = le32_to_cpu(hdr->msg.get.ptl_index);
 130                         ev->match_bits = le64_to_cpu(hdr->msg.get.match_bits);
 131                         ev->mlength    =
 132                         ev->rlength    = le32_to_cpu(hdr->msg.get.sink_length);
 133                         ev->offset     = le32_to_cpu(hdr->msg.get.src_offset);
 134                         ev->hdr_data   = 0;
 135                 }
 136                 return;
 137         }
 138 }
 139
 140 void
 141 lnet_msg_commit(struct lnet_msg *msg, int cpt)
 142 {
 143         struct lnet_msg_container *container = the_lnet.ln_msg_containers[cpt];
 144         struct lnet_counters_common *common;
 145         s64 timeout_ns;
 146
 147         /* set the message deadline */
 148         timeout_ns = lnet_transaction_timeout * NSEC_PER_SEC;
 149         msg->msg_deadline = ktime_add_ns(ktime_get(), timeout_ns);
 150
 151         /* routed message can be committed for both receiving and sending */
 152         LASSERT(!msg->msg_tx_committed);
 153
 154         if (msg->msg_sending) {
 155                 LASSERT(!msg->msg_receiving);
 156                 msg->msg_tx_cpt = cpt;
 157                 msg->msg_tx_committed = 1;
 158                 if (msg->msg_rx_committed) { /* routed message REPLY */
 159                         LASSERT(msg->msg_onactivelist);
 160                         return;
 161                 }
 162         } else {
 163                 LASSERT(!msg->msg_sending);
 164                 msg->msg_rx_cpt = cpt;
 165                 msg->msg_rx_committed = 1;
 166         }
 167
 168         LASSERT(!msg->msg_onactivelist);
 169
 170         msg->msg_onactivelist = 1;
 171         list_add_tail(&msg->msg_activelist, &container->msc_active);
 172
 173         common = &the_lnet.ln_counters[cpt]->lct_common;
 174         common->lcc_msgs_alloc++;
 175         if (common->lcc_msgs_alloc > common->lcc_msgs_max)
 176                 common->lcc_msgs_max = common->lcc_msgs_alloc;
 177 }
 178
 179 static void
 180 lnet_msg_decommit_tx(struct lnet_msg *msg, int status)
 181 {
 182         struct lnet_counters_common *common;
 183         struct lnet_event *ev = &msg->msg_ev;
 184
 185         LASSERT(msg->msg_tx_committed);
 186         if (status != 0)
 187                 goto out;
 188
 189         common = &(the_lnet.ln_counters[msg->msg_tx_cpt]->lct_common);
 190         switch (ev->type) {
 191         default: /* routed message */
 192                 LASSERT(msg->msg_routing);
 193                 LASSERT(msg->msg_rx_committed);
 194                 LASSERT(ev->type == 0);
 195
 196                 common->lcc_route_length += msg->msg_len;
 197                 common->lcc_route_count++;
 198                 goto incr_stats;
 199
 200         case LNET_EVENT_PUT:
 201                 /* should have been decommitted */
 202                 LASSERT(!msg->msg_rx_committed);
 203                 /* overwritten while sending ACK */
 204                 LASSERT(msg->msg_type == LNET_MSG_ACK);
 205                 msg->msg_type = LNET_MSG_PUT; /* fix type */
 206                 break;
 207
 208         case LNET_EVENT_SEND:
 209                 LASSERT(!msg->msg_rx_committed);
 210                 if (msg->msg_type == LNET_MSG_PUT)
 211                         common->lcc_send_length += msg->msg_len;
 212                 break;
 213
 214         case LNET_EVENT_GET:
 215                 LASSERT(msg->msg_rx_committed);
 216                 /* overwritten while sending reply, we should never be
 217                  * here for optimized GET */
 218                 LASSERT(msg->msg_type == LNET_MSG_REPLY);
 219                 msg->msg_type = LNET_MSG_GET; /* fix type */
 220                 break;
 221         }
 222
 223         common->lcc_send_count++;
 224
 225 incr_stats:
 226         if (msg->msg_txpeer)
 227                 lnet_incr_stats(&msg->msg_txpeer->lpni_stats,
 228                                 msg->msg_type,
 229                                 LNET_STATS_TYPE_SEND);
 230         if (msg->msg_txni)
 231                 lnet_incr_stats(&msg->msg_txni->ni_stats,
 232                                 msg->msg_type,
 233                                 LNET_STATS_TYPE_SEND);
 234  out:
 235         lnet_return_tx_credits_locked(msg);
 236         msg->msg_tx_committed = 0;
 237 }
 238
 239 static void
 240 lnet_msg_decommit_rx(struct lnet_msg *msg, int status)
 241 {
 242         struct lnet_counters_common *common;
 243         struct lnet_event *ev = &msg->msg_ev;
 244
 245         LASSERT(!msg->msg_tx_committed); /* decommitted or never committed */
 246         LASSERT(msg->msg_rx_committed);
 247
 248         if (status != 0)
 249                 goto out;
 250
 251         common = &(the_lnet.ln_counters[msg->msg_rx_cpt]->lct_common);
 252         switch (ev->type) {
 253         default:
 254                 LASSERT(ev->type == 0);
 255                 LASSERT(msg->msg_routing);
 256                 goto incr_stats;
 257
 258         case LNET_EVENT_ACK:
 259                 LASSERT(msg->msg_type == LNET_MSG_ACK);
 260                 break;
 261
 262         case LNET_EVENT_GET:
 263                 /* type is "REPLY" if it's an optimized GET on passive side,
 264                  * because optimized GET will never be committed for sending,
 265                  * so message type wouldn't be changed back to "GET" by
 266                  * lnet_msg_decommit_tx(), see details in lnet_parse_get() */
 267                 LASSERT(msg->msg_type == LNET_MSG_REPLY ||
 268                         msg->msg_type == LNET_MSG_GET);
 269                 common->lcc_send_length += msg->msg_wanted;
 270                 break;
 271
 272         case LNET_EVENT_PUT:
 273                 LASSERT(msg->msg_type == LNET_MSG_PUT);
 274                 break;
 275
 276         case LNET_EVENT_REPLY:
 277                 /* type is "GET" if it's an optimized GET on active side,
 278                  * see details in lnet_create_reply_msg() */
 279                 LASSERT(msg->msg_type == LNET_MSG_GET ||
 280                         msg->msg_type == LNET_MSG_REPLY);
 281                 break;
 282         }
 283
 284         common->lcc_recv_count++;
 285
 286 incr_stats:
 287         if (msg->msg_rxpeer)
 288                 lnet_incr_stats(&msg->msg_rxpeer->lpni_stats,
 289                                 msg->msg_type,
 290                                 LNET_STATS_TYPE_RECV);
 291         if (msg->msg_rxni)
 292                 lnet_incr_stats(&msg->msg_rxni->ni_stats,
 293                                 msg->msg_type,
 294                                 LNET_STATS_TYPE_RECV);
 295         if (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_REPLY)
 296                 common->lcc_recv_length += msg->msg_wanted;
 297
 298  out:
 299         lnet_return_rx_credits_locked(msg);
 300         msg->msg_rx_committed = 0;
 301 }
 302
 303 void
 304 lnet_msg_decommit(struct lnet_msg *msg, int cpt, int status)
 305 {
 306         int     cpt2 = cpt;
 307
 308         LASSERT(msg->msg_tx_committed || msg->msg_rx_committed);
 309         LASSERT(msg->msg_onactivelist);
 310
 311         if (msg->msg_tx_committed) { /* always decommit for sending first */
 312                 LASSERT(cpt == msg->msg_tx_cpt);
 313                 lnet_msg_decommit_tx(msg, status);
 314         }
 315
 316         if (msg->msg_rx_committed) {
 317                 /* forwarding msg committed for both receiving and sending */
 318                 if (cpt != msg->msg_rx_cpt) {
 319                         lnet_net_unlock(cpt);
 320                         cpt2 = msg->msg_rx_cpt;
 321                         lnet_net_lock(cpt2);
 322                 }
 323                 lnet_msg_decommit_rx(msg, status);
 324         }
 325
 326         list_del(&msg->msg_activelist);
 327         msg->msg_onactivelist = 0;
 328
 329         the_lnet.ln_counters[cpt2]->lct_common.lcc_msgs_alloc--;
 330
 331         if (cpt2 != cpt) {
 332                 lnet_net_unlock(cpt2);
 333                 lnet_net_lock(cpt);
 334         }
 335 }
 336
 337 void
 338 lnet_msg_attach_md(struct lnet_msg *msg, struct lnet_libmd *md,
 339                    unsigned int offset, unsigned int mlen)
 340 {
 341         /* NB: @offset and @len are only useful for receiving */
 342         /* Here, we attach the MD on lnet_msg and mark it busy and
 343          * decrementing its threshold. Come what may, the lnet_msg "owns"
 344          * the MD until a call to lnet_msg_detach_md or lnet_finalize()
 345          * signals completion. */
 346         LASSERT(!msg->msg_routing);
 347
 348         msg->msg_md = md;
 349         if (msg->msg_receiving) { /* committed for receiving */
 350                 msg->msg_offset = offset;
 351                 msg->msg_wanted = mlen;
 352         }
 353
 354         md->md_refcount++;
 355         if (md->md_threshold != LNET_MD_THRESH_INF) {
 356                 LASSERT(md->md_threshold > 0);
 357                 md->md_threshold--;
 358         }
 359
 360         /* build umd in event */
 361         lnet_md2handle(&msg->msg_ev.md_handle, md);
 362         lnet_md_deconstruct(md, &msg->msg_ev);
 363 }
 364
 365 static int
 366 lnet_complete_msg_locked(struct lnet_msg *msg, int cpt)
 367 {
 368         struct lnet_handle_wire ack_wmd;
 369         int                rc;
 370         int                status = msg->msg_ev.status;
 371
 372         LASSERT(msg->msg_onactivelist);
 373
 374         if (status == 0 && msg->msg_ack) {
 375                 /* Only send an ACK if the PUT completed successfully */
 376
 377                 lnet_msg_decommit(msg, cpt, 0);
 378
 379                 msg->msg_ack = 0;
 380                 lnet_net_unlock(cpt);
 381
 382                 LASSERT(msg->msg_ev.type == LNET_EVENT_PUT);
 383                 LASSERT(!msg->msg_routing);
 384
 385                 ack_wmd = msg->msg_hdr.msg.put.ack_wmd;
 386
 387                 lnet_prep_send(msg, LNET_MSG_ACK, msg->msg_ev.source, 0, 0);
 388
 389                 msg->msg_hdr.msg.ack.dst_wmd = ack_wmd;
 390                 msg->msg_hdr.msg.ack.match_bits = msg->msg_ev.match_bits;
 391                 msg->msg_hdr.msg.ack.mlength = cpu_to_le32(msg->msg_ev.mlength);
 392
 393                 rc = lnet_send(msg->msg_ev.target.nid, msg, msg->msg_from);
 394
 395                 lnet_net_lock(cpt);
 396                 /*
 397                  * NB: message is committed for sending, we should return
 398                  * on success because LND will finalize this message later.
 399                  *
 400                  * Also, there is possibility that message is committed for
 401                  * sending and also failed before delivering to LND,
 402                  * i.e: ENOMEM, in that case we can't fall through either
 403                  * because CPT for sending can be different with CPT for
 404                  * receiving, so we should return back to lnet_finalize()
 405                  * to make sure we are locking the correct partition.
 406                  */
 407                 return rc;
 408
 409         } else if (status == 0 &&       /* OK so far */
 410                    (msg->msg_routing && !msg->msg_sending)) {
 411                 /* not forwarded */
 412                 LASSERT(!msg->msg_receiving);   /* called back recv already */
 413                 lnet_net_unlock(cpt);
 414
 415                 rc = lnet_send(LNET_NID_ANY, msg, LNET_NID_ANY);
 416
 417                 lnet_net_lock(cpt);
 418                 /*
 419                  * NB: message is committed for sending, we should return
 420                  * on success because LND will finalize this message later.
 421                  *
 422                  * Also, there is possibility that message is committed for
 423                  * sending and also failed before delivering to LND,
 424                  * i.e: ENOMEM, in that case we can't fall through either:
 425                  * - The rule is message must decommit for sending first if
 426                  *   the it's committed for both sending and receiving
 427                  * - CPT for sending can be different with CPT for receiving,
 428                  *   so we should return back to lnet_finalize() to make
 429                  *   sure we are locking the correct partition.
 430                  */
 431                 return rc;
 432         }
 433
 434         lnet_msg_decommit(msg, cpt, status);
 435         lnet_msg_free(msg);
 436         return 0;
 437 }
 438
 439 static void
 440 lnet_dec_healthv_locked(atomic_t *healthv, int sensitivity)
 441 {
 442         int h = atomic_read(healthv);
 443
 444         if (h < sensitivity) {
 445                 atomic_set(healthv, 0);
 446         } else {
 447                 h -= sensitivity;
 448                 atomic_set(healthv, h);
 449         }
 450 }
 451
 452 /* must hold net_lock/0 */
 453 void
 454 lnet_ni_add_to_recoveryq_locked(struct lnet_ni *ni,
 455                                 struct list_head *recovery_queue, time64_t now)
 456 {
 457         if (!list_empty(&ni->ni_recovery))
 458                 return;
 459
 460         if (atomic_read(&ni->ni_healthv) == LNET_MAX_HEALTH_VALUE)
 461                 return;
 462
 463         /* This NI is going on the recovery queue, so take a ref on it */
 464         lnet_ni_addref_locked(ni, 0);
 465
 466         lnet_ni_set_next_ping(ni, now);
 467
 468         CDEBUG(D_NET, "%s added to recovery queue. ping count: %u next ping: %lld health :%d\n",
 469                libcfs_nidstr(&ni->ni_nid),
 470                ni->ni_ping_count,
 471                ni->ni_next_ping,
 472                atomic_read(&ni->ni_healthv));
 473
 474         list_add_tail(&ni->ni_recovery, recovery_queue);
 475 }
 476
 477 static void
 478 lnet_handle_local_failure(struct lnet_ni *local_ni)
 479 {
 480         /*
 481          * the lnet_net_lock(0) is used to protect the addref on the ni
 482          * and the recovery queue.
 483          */
 484         lnet_net_lock(0);
 485         /* the mt could've shutdown and cleaned up the queues */
 486         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING) {
 487                 lnet_net_unlock(0);
 488                 return;
 489         }
 490
 491         lnet_dec_healthv_locked(&local_ni->ni_healthv, lnet_health_sensitivity);
 492         lnet_ni_add_to_recoveryq_locked(local_ni, &the_lnet.ln_mt_localNIRecovq,
 493                                         ktime_get_seconds());
 494         lnet_net_unlock(0);
 495 }
 496
 497 /* must hold net_lock/0 */
 498 void
 499 lnet_handle_remote_failure_locked(struct lnet_peer_ni *lpni)
 500 {
 501         __u32 sensitivity = lnet_health_sensitivity;
 502         __u32 lp_sensitivity;
 503
 504         /*
 505          * If there is a health sensitivity in the peer then use that
 506          * instead of the globally set one.
 507          */
 508         lp_sensitivity = lpni->lpni_peer_net->lpn_peer->lp_health_sensitivity;
 509         if (lp_sensitivity)
 510                 sensitivity = lp_sensitivity;
 511
 512         lnet_dec_healthv_locked(&lpni->lpni_healthv, sensitivity);
 513
 514         /* update the peer_net's health value */
 515         lnet_update_peer_net_healthv(lpni);
 516
 517         /*
 518          * add the peer NI to the recovery queue if it's not already there
 519          * and it's health value is actually below the maximum. It's
 520          * possible that the sensitivity might be set to 0, and the health
 521          * value will not be reduced. In this case, there is no reason to
 522          * invoke recovery
 523          */
 524         lnet_peer_ni_add_to_recoveryq_locked(lpni,
 525                                              &the_lnet.ln_mt_peerNIRecovq,
 526                                              ktime_get_seconds());
 527 }
 528
 529 static void
 530 lnet_handle_remote_failure(struct lnet_peer_ni *lpni)
 531 {
 532         /* lpni could be NULL if we're in the LOLND case */
 533         if (!lpni)
 534                 return;
 535
 536         lnet_net_lock(0);
 537         /* the mt could've shutdown and cleaned up the queues */
 538         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING) {
 539                 lnet_net_unlock(0);
 540                 return;
 541         }
 542         lnet_handle_remote_failure_locked(lpni);
 543         lnet_net_unlock(0);
 544 }
 545
 546 static void
 547 lnet_incr_hstats(struct lnet_ni *ni, struct lnet_peer_ni *lpni,
 548                  enum lnet_msg_hstatus hstatus)
 549 {
 550         struct lnet_counters_health *health;
 551
 552         health = &the_lnet.ln_counters[0]->lct_health;
 553
 554         switch (hstatus) {
 555         case LNET_MSG_STATUS_LOCAL_INTERRUPT:
 556                 atomic_inc(&ni->ni_hstats.hlt_local_interrupt);
 557                 health->lch_local_interrupt_count++;
 558                 break;
 559         case LNET_MSG_STATUS_LOCAL_DROPPED:
 560                 atomic_inc(&ni->ni_hstats.hlt_local_dropped);
 561                 health->lch_local_dropped_count++;
 562                 break;
 563         case LNET_MSG_STATUS_LOCAL_ABORTED:
 564                 atomic_inc(&ni->ni_hstats.hlt_local_aborted);
 565                 health->lch_local_aborted_count++;
 566                 break;
 567         case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
 568                 atomic_inc(&ni->ni_hstats.hlt_local_no_route);
 569                 health->lch_local_no_route_count++;
 570                 break;
 571         case LNET_MSG_STATUS_LOCAL_TIMEOUT:
 572                 atomic_inc(&ni->ni_hstats.hlt_local_timeout);
 573                 health->lch_local_timeout_count++;
 574                 break;
 575         case LNET_MSG_STATUS_LOCAL_ERROR:
 576                 atomic_inc(&ni->ni_hstats.hlt_local_error);
 577                 health->lch_local_error_count++;
 578                 break;
 579         case LNET_MSG_STATUS_REMOTE_DROPPED:
 580                 if (lpni)
 581                         atomic_inc(&lpni->lpni_hstats.hlt_remote_dropped);
 582                 health->lch_remote_dropped_count++;
 583                 break;
 584         case LNET_MSG_STATUS_REMOTE_ERROR:
 585                 if (lpni)
 586                         atomic_inc(&lpni->lpni_hstats.hlt_remote_error);
 587                 health->lch_remote_error_count++;
 588                 break;
 589         case LNET_MSG_STATUS_REMOTE_TIMEOUT:
 590                 if (lpni)
 591                         atomic_inc(&lpni->lpni_hstats.hlt_remote_timeout);
 592                 health->lch_remote_timeout_count++;
 593                 break;
 594         case LNET_MSG_STATUS_NETWORK_TIMEOUT:
 595                 if (lpni)
 596                         atomic_inc(&lpni->lpni_hstats.hlt_network_timeout);
 597                 health->lch_network_timeout_count++;
 598                 break;
 599         case LNET_MSG_STATUS_OK:
 600                 break;
 601         default:
 602                 LBUG();
 603         }
 604 }
 605
 606 static void
 607 lnet_resend_msg_locked(struct lnet_msg *msg)
 608 {
 609         msg->msg_retry_count++;
 610
 611         /*
 612          * remove message from the active list and reset it to prepare
 613          * for a resend. Two exceptions to this
 614          *
 615          * 1. the router case. When a message is being routed it is
 616          * committed for rx when received and committed for tx when
 617          * forwarded. We don't want to remove it from the active list, since
 618          * code which handles receiving expects it to remain on the active
 619          * list.
 620          *
 621          * 2. The REPLY case. Reply messages use the same message
 622          * structure for the GET that was received.
 623          */
 624         if (!msg->msg_routing && msg->msg_type != LNET_MSG_REPLY) {
 625                 list_del_init(&msg->msg_activelist);
 626                 msg->msg_onactivelist = 0;
 627         }
 628         /*
 629          * The msg_target.nid which was originally set
 630          * when calling LNetGet() or LNetPut() might've
 631          * been overwritten if we're routing this message.
 632          * Call lnet_msg_decommit_tx() to return the credit
 633          * this message consumed. The message will
 634          * consume another credit when it gets resent.
 635          */
 636         msg->msg_target.nid = msg->msg_hdr.dest_nid;
 637         lnet_msg_decommit_tx(msg, -EAGAIN);
 638         msg->msg_sending = 0;
 639         msg->msg_receiving = 0;
 640         msg->msg_target_is_router = 0;
 641
 642         CDEBUG(D_NET, "%s->%s:%s:%s - queuing msg (%p) for resend\n",
 643                libcfs_nid2str(msg->msg_hdr.src_nid),
 644                libcfs_nid2str(msg->msg_hdr.dest_nid),
 645                lnet_msgtyp2str(msg->msg_type),
 646                lnet_health_error2str(msg->msg_health_status), msg);
 647
 648         list_add_tail(&msg->msg_list, the_lnet.ln_mt_resendqs[msg->msg_tx_cpt]);
 649
 650         complete(&the_lnet.ln_mt_wait_complete);
 651 }
 652
 653 int
 654 lnet_check_finalize_recursion_locked(struct lnet_msg *msg,
 655                                      struct list_head *containerq,
 656                                      int nworkers, void **workers)
 657 {
 658         int my_slot = -1;
 659         int i;
 660
 661         list_add_tail(&msg->msg_list, containerq);
 662
 663         for (i = 0; i < nworkers; i++) {
 664                 if (workers[i] == current)
 665                         break;
 666
 667                 if (my_slot < 0 && workers[i] == NULL)
 668                         my_slot = i;
 669         }
 670
 671         if (i < nworkers || my_slot < 0)
 672                 return -1;
 673
 674         workers[my_slot] = current;
 675
 676         return my_slot;
 677 }
 678
 679 int
 680 lnet_attempt_msg_resend(struct lnet_msg *msg)
 681 {
 682         struct lnet_msg_container *container;
 683         int my_slot;
 684         int cpt;
 685
 686         /* we can only resend tx_committed messages */
 687         LASSERT(msg->msg_tx_committed);
 688
 689         /* don't resend recovery messages */
 690         if (msg->msg_recovery) {
 691                 CDEBUG(D_NET, "msg %s->%s is a recovery ping. retry# %d\n",
 692                         libcfs_nid2str(msg->msg_from),
 693                         libcfs_nid2str(msg->msg_target.nid),
 694                         msg->msg_retry_count);
 695                 return -ENOTRECOVERABLE;
 696         }
 697
 698         /*
 699          * if we explicitly indicated we don't want to resend then just
 700          * return
 701          */
 702         if (msg->msg_no_resend) {
 703                 CDEBUG(D_NET, "msg %s->%s requested no resend. retry# %d\n",
 704                         libcfs_nid2str(msg->msg_from),
 705                         libcfs_nid2str(msg->msg_target.nid),
 706                         msg->msg_retry_count);
 707                 return -ENOTRECOVERABLE;
 708         }
 709
 710         /* check if the message has exceeded the number of retries */
 711         if (msg->msg_retry_count >= lnet_retry_count) {
 712                 CNETERR("msg %s->%s exceeded retry count %d\n",
 713                         libcfs_nid2str(msg->msg_from),
 714                         libcfs_nid2str(msg->msg_target.nid),
 715                         msg->msg_retry_count);
 716                 return -ENOTRECOVERABLE;
 717         }
 718
 719         cpt = msg->msg_tx_cpt;
 720         lnet_net_lock(cpt);
 721
 722         /* check again under lock */
 723         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING) {
 724                 lnet_net_unlock(cpt);
 725                 return -ESHUTDOWN;
 726         }
 727
 728         container = the_lnet.ln_msg_containers[cpt];
 729         my_slot =
 730                 lnet_check_finalize_recursion_locked(msg,
 731                                         &container->msc_resending,
 732                                         container->msc_nfinalizers,
 733                                         container->msc_resenders);
 734
 735         /* enough threads are resending */
 736         if (my_slot == -1) {
 737                 lnet_net_unlock(cpt);
 738                 return 0;
 739         }
 740
 741         while (!list_empty(&container->msc_resending)) {
 742                 msg = list_entry(container->msc_resending.next,
 743                                         struct lnet_msg, msg_list);
 744                 list_del(&msg->msg_list);
 745
 746                 /*
 747                  * resending the message will require us to call
 748                  * lnet_msg_decommit_tx() which will return the credit
 749                  * which this message holds. This could trigger another
 750                  * queued message to be sent. If that message fails and
 751                  * requires a resend we will recurse.
 752                  * But since at this point the slot is taken, the message
 753                  * will be queued in the container and dealt with
 754                  * later. This breaks the recursion.
 755                  */
 756                 lnet_resend_msg_locked(msg);
 757         }
 758
 759         /*
 760          * msc_resenders is an array of process pointers. Each entry holds
 761          * a pointer to the current process operating on the message. An
 762          * array entry is created per CPT. If the array slot is already
 763          * set, then it means that there is a thread on the CPT currently
 764          * resending a message.
 765          * Once the thread finishes clear the slot to enable the thread to
 766          * take on more resend work.
 767          */
 768         container->msc_resenders[my_slot] = NULL;
 769         lnet_net_unlock(cpt);
 770
 771         return 0;
 772 }
 773
 774 /*
 775  * Do a health check on the message:
 776  * return -1 if we're not going to handle the error or
 777  *   if we've reached the maximum number of retries.
 778  *   success case will return -1 as well
 779  * return 0 if it the message is requeued for send
 780  */
 781 static int
 782 lnet_health_check(struct lnet_msg *msg)
 783 {
 784         enum lnet_msg_hstatus hstatus = msg->msg_health_status;
 785         struct lnet_peer_ni *lpni;
 786         struct lnet_ni *ni;
 787         bool lo = false;
 788         bool attempt_local_resend;
 789         bool attempt_remote_resend;
 790         bool handle_local_health;
 791         bool handle_remote_health;
 792
 793         /* if we're shutting down no point in handling health. */
 794         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
 795                 return -1;
 796
 797         LASSERT(msg->msg_tx_committed || msg->msg_rx_committed);
 798
 799         /*
 800          * if we're sending to the LOLND then the msg_txpeer will not be
 801          * set. So no need to sanity check it.
 802          */
 803         if (msg->msg_tx_committed &&
 804             !nid_is_lo0(&msg->msg_txni->ni_nid))
 805                 LASSERT(msg->msg_txpeer);
 806         else if (msg->msg_tx_committed &&
 807                  nid_is_lo0(&msg->msg_txni->ni_nid))
 808                 lo = true;
 809
 810         if (hstatus != LNET_MSG_STATUS_OK &&
 811             ktime_compare(ktime_get(), msg->msg_deadline) >= 0)
 812                 return -1;
 813
 814         /*
 815          * always prefer txni/txpeer if they message is committed for both
 816          * directions.
 817          */
 818         if (msg->msg_tx_committed) {
 819                 ni = msg->msg_txni;
 820                 lpni = msg->msg_txpeer;
 821                 attempt_local_resend = attempt_remote_resend = true;
 822         } else {
 823                 ni = msg->msg_rxni;
 824                 lpni = msg->msg_rxpeer;
 825                 attempt_local_resend = attempt_remote_resend = false;
 826         }
 827
 828         if (!lo)
 829                 LASSERT(ni && lpni);
 830         else
 831                 LASSERT(ni);
 832
 833         CDEBUG(D_NET, "health check: %s->%s: %s: %s\n",
 834                libcfs_nidstr(&ni->ni_nid),
 835                (lo) ? "self" : libcfs_nidstr(&lpni->lpni_nid),
 836                lnet_msgtyp2str(msg->msg_type),
 837                lnet_health_error2str(hstatus));
 838
 839         /*
 840          * stats are only incremented for errors so avoid wasting time
 841          * incrementing statistics if there is no error. Similarly, whether to
 842          * update health values or perform resends is only applicable for
 843          * messages with a health status != OK.
 844          */
 845         if (hstatus != LNET_MSG_STATUS_OK) {
 846                 /* Don't further decrement the health value if a recovery
 847                  * message failed.
 848                  */
 849                 if (msg->msg_recovery)
 850                         handle_local_health = handle_remote_health = false;
 851                 else
 852                         handle_local_health = handle_remote_health = true;
 853
 854                 /* For local failures, health/recovery/resends are not needed if
 855                  * I only have a single (non-lolnd) interface. NB: pb_nnis
 856                  * includes the lolnd interface, so a single-rail node would
 857                  * have pb_nnis == 2.
 858                  */
 859                 if (the_lnet.ln_ping_target->pb_nnis <= 2) {
 860                         handle_local_health = false;
 861                         attempt_local_resend = false;
 862                 }
 863
 864                 lnet_net_lock(0);
 865                 lnet_incr_hstats(ni, lpni, hstatus);
 866                 /* For remote failures, health/recovery/resends are not needed
 867                  * if the peer only has a single interface. Special case for
 868                  * routers where we rely on health feature to manage route
 869                  * aliveness. NB: unlike pb_nnis above, lp_nnis does _not_
 870                  * include the lolnd, so a single-rail node would have
 871                  * lp_nnis == 1.
 872                  */
 873                 if (lpni && lpni->lpni_peer_net &&
 874                     lpni->lpni_peer_net->lpn_peer &&
 875                     lpni->lpni_peer_net->lpn_peer->lp_nnis <= 1) {
 876                         attempt_remote_resend = false;
 877                         if (!lnet_isrouter(lpni))
 878                                 handle_remote_health = false;
 879                 }
 880                 lnet_net_unlock(0);
 881         }
 882
 883         switch (hstatus) {
 884         case LNET_MSG_STATUS_OK:
 885                 /*
 886                  * increment the local ni health whether we successfully
 887                  * received or sent a message on it.
 888                  *
 889                  * Ping counts are reset to 0 as appropriate to allow for
 890                  * faster recovery.
 891                  */
 892                 lnet_inc_healthv(&ni->ni_healthv, lnet_health_sensitivity);
 893                 lnet_net_lock(0);
 894                 ni->ni_ping_count = 0;
 895                 /*
 896                  * It's possible msg_txpeer is NULL in the LOLND
 897                  * case. Only increment the peer's health if we're
 898                  * receiving a message from it. It's the only sure way to
 899                  * know that a remote interface is up.
 900                  * If this interface is part of a router, then take that
 901                  * as indication that the router is fully healthy.
 902                  */
 903                 if (lpni && msg->msg_rx_committed) {
 904                         lpni->lpni_ping_count = 0;
 905                         /*
 906                          * If we're receiving a message from the router or
 907                          * I'm a router, then set that lpni's health to
 908                          * maximum so we can commence communication
 909                          */
 910                         if (lnet_isrouter(lpni) || the_lnet.ln_routing) {
 911                                 lnet_set_lpni_healthv_locked(lpni,
 912                                         LNET_MAX_HEALTH_VALUE);
 913                         } else {
 914                                 __u32 sensitivity = lpni->lpni_peer_net->
 915                                         lpn_peer->lp_health_sensitivity;
 916
 917                                 lnet_inc_lpni_healthv_locked(lpni,
 918                                         (sensitivity) ? sensitivity :
 919                                         lnet_health_sensitivity);
 920                                 /* This peer NI may have previously aged out
 921                                  * of recovery. Now that we've received a
 922                                  * message from it, we can continue recovery
 923                                  * if its health value is still below the
 924                                  * maximum.
 925                                  */
 926                                 lnet_peer_ni_add_to_recoveryq_locked(lpni,
 927                                                 &the_lnet.ln_mt_peerNIRecovq,
 928                                                 ktime_get_seconds());
 929                         }
 930                 }
 931                 lnet_net_unlock(0);
 932
 933                 /* we can finalize this message */
 934                 return -1;
 935         case LNET_MSG_STATUS_LOCAL_INTERRUPT:
 936         case LNET_MSG_STATUS_LOCAL_DROPPED:
 937         case LNET_MSG_STATUS_LOCAL_ABORTED:
 938         case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
 939         case LNET_MSG_STATUS_LOCAL_TIMEOUT:
 940                 if (handle_local_health)
 941                         lnet_handle_local_failure(ni);
 942                 if (attempt_local_resend)
 943                         return lnet_attempt_msg_resend(msg);
 944                 break;
 945         case LNET_MSG_STATUS_LOCAL_ERROR:
 946                 if (handle_local_health)
 947                         lnet_handle_local_failure(ni);
 948                 return -1;
 949         case LNET_MSG_STATUS_REMOTE_DROPPED:
 950                 if (handle_remote_health)
 951                         lnet_handle_remote_failure(lpni);
 952                 if (attempt_remote_resend)
 953                         return lnet_attempt_msg_resend(msg);
 954                 break;
 955         case LNET_MSG_STATUS_REMOTE_ERROR:
 956         case LNET_MSG_STATUS_REMOTE_TIMEOUT:
 957                 if (handle_remote_health)
 958                         lnet_handle_remote_failure(lpni);
 959                 return -1;
 960         case LNET_MSG_STATUS_NETWORK_TIMEOUT:
 961                 if (handle_remote_health)
 962                         lnet_handle_remote_failure(lpni);
 963                 if (handle_local_health)
 964                         lnet_handle_local_failure(ni);
 965                 return -1;
 966         default:
 967                 LBUG();
 968         }
 969
 970         /* no resend is needed */
 971         return -1;
 972 }
 973
 974 static void
 975 lnet_msg_detach_md(struct lnet_msg *msg, int status)
 976 {
 977         struct lnet_libmd *md = msg->msg_md;
 978         lnet_handler_t handler = NULL;
 979         int cpt = lnet_cpt_of_cookie(md->md_lh.lh_cookie);
 980         int unlink;
 981
 982         lnet_res_lock(cpt);
 983         while (md->md_flags & LNET_MD_FLAG_HANDLING)
 984                 /* An event handler is running - wait for it to
 985                  * complete to avoid races.
 986                  */
 987                 lnet_md_wait_handling(md, cpt);
 988
 989         /* Now it's safe to drop my caller's ref */
 990         md->md_refcount--;
 991         LASSERT(md->md_refcount >= 0);
 992
 993         unlink = lnet_md_unlinkable(md);
 994         if (md->md_handler) {
 995                 if ((md->md_flags & LNET_MD_FLAG_ABORTED) && !status) {
 996                         msg->msg_ev.status   = -ETIMEDOUT;
 997                         CDEBUG(D_NET, "md 0x%p already unlinked\n", md);
 998                 } else {
 999                         msg->msg_ev.status   = status;
1000                 }
1001                 msg->msg_ev.unlinked = unlink;
1002                 handler = md->md_handler;
1003                 if (!unlink)
1004                         md->md_flags |= LNET_MD_FLAG_HANDLING;
1005         }
1006
1007         if (unlink || (md->md_refcount == 0 &&
1008                        md->md_threshold == LNET_MD_THRESH_INF))
1009                 lnet_detach_rsp_tracker(md, cpt);
1010
1011         msg->msg_md = NULL;
1012         if (unlink)
1013                 lnet_md_unlink(md);
1014
1015         lnet_res_unlock(cpt);
1016
1017         if (handler) {
1018                 handler(&msg->msg_ev);
1019                 if (!unlink) {
1020                         lnet_res_lock(cpt);
1021                         md->md_flags &= ~LNET_MD_FLAG_HANDLING;
1022                         wake_up_var(md);
1023                         lnet_res_unlock(cpt);
1024                 }
1025         }
1026 }
1027
1028 static bool
1029 lnet_is_health_check(struct lnet_msg *msg)
1030 {
1031         bool hc = true;
1032         int status = msg->msg_ev.status;
1033
1034         if ((!msg->msg_tx_committed && !msg->msg_rx_committed) ||
1035             !msg->msg_onactivelist) {
1036                 CDEBUG(D_NET, "msg %p not committed for send or receive\n",
1037                        msg);
1038                 return false;
1039         }
1040
1041         if ((msg->msg_tx_committed && !msg->msg_txpeer) ||
1042             (msg->msg_rx_committed && !msg->msg_rxpeer)) {
1043                 /* The optimized GET case does not set msg_rxpeer, but status
1044                  * could be zero. Only print the error message if we have a
1045                  * non-zero status.
1046                  */
1047                 if (status)
1048                         CDEBUG(D_NET, "msg %p status %d cannot retry\n", msg,
1049                                status);
1050                 return false;
1051         }
1052
1053         /* Check for status inconsistencies */
1054         if ((!status && msg->msg_health_status != LNET_MSG_STATUS_OK) ||
1055              (status && msg->msg_health_status == LNET_MSG_STATUS_OK)) {
1056                 CDEBUG(D_NET, "Msg %p is in inconsistent state, don't perform health "
1057                        "checking (%d, %d)\n", msg, status,
1058                        msg->msg_health_status);
1059                 hc = false;
1060         }
1061
1062         CDEBUG(D_NET, "health check = %d, status = %d, hstatus = %d\n",
1063                hc, status, msg->msg_health_status);
1064
1065         return hc;
1066 }
1067
1068 char *
1069 lnet_health_error2str(enum lnet_msg_hstatus hstatus)
1070 {
1071         switch (hstatus) {
1072         case LNET_MSG_STATUS_LOCAL_INTERRUPT:
1073                 return "LOCAL_INTERRUPT";
1074         case LNET_MSG_STATUS_LOCAL_DROPPED:
1075                 return "LOCAL_DROPPED";
1076         case LNET_MSG_STATUS_LOCAL_ABORTED:
1077                 return "LOCAL_ABORTED";
1078         case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
1079                 return "LOCAL_NO_ROUTE";
1080         case LNET_MSG_STATUS_LOCAL_TIMEOUT:
1081                 return "LOCAL_TIMEOUT";
1082         case LNET_MSG_STATUS_LOCAL_ERROR:
1083                 return "LOCAL_ERROR";
1084         case LNET_MSG_STATUS_REMOTE_DROPPED:
1085                 return "REMOTE_DROPPED";
1086         case LNET_MSG_STATUS_REMOTE_ERROR:
1087                 return "REMOTE_ERROR";
1088         case LNET_MSG_STATUS_REMOTE_TIMEOUT:
1089                 return "REMOTE_TIMEOUT";
1090         case LNET_MSG_STATUS_NETWORK_TIMEOUT:
1091                 return "NETWORK_TIMEOUT";
1092         case LNET_MSG_STATUS_OK:
1093                 return "OK";
1094         default:
1095                 return "<UNKNOWN>";
1096         }
1097 }
1098
1099 bool
1100 lnet_send_error_simulation(struct lnet_msg *msg,
1101                            enum lnet_msg_hstatus *hstatus)
1102 {
1103         if (!msg)
1104                 return false;
1105
1106         if (list_empty(&the_lnet.ln_drop_rules))
1107             return false;
1108
1109         /* match only health rules */
1110         if (!lnet_drop_rule_match(&msg->msg_hdr, LNET_NID_ANY,
1111                                   hstatus))
1112                 return false;
1113
1114         CDEBUG(D_NET, "src %s(%s)->dst %s: %s simulate health error: %s\n",
1115                 libcfs_nid2str(msg->msg_hdr.src_nid),
1116                 libcfs_nidstr(&msg->msg_txni->ni_nid),
1117                 libcfs_nid2str(msg->msg_hdr.dest_nid),
1118                 lnet_msgtyp2str(msg->msg_type),
1119                 lnet_health_error2str(*hstatus));
1120
1121         return true;
1122 }
1123 EXPORT_SYMBOL(lnet_send_error_simulation);
1124
1125 void
1126 lnet_finalize(struct lnet_msg *msg, int status)
1127 {
1128         struct lnet_msg_container *container;
1129         int my_slot;
1130         int cpt;
1131         int rc;
1132
1133         LASSERT(!in_interrupt());
1134
1135         if (msg == NULL)
1136                 return;
1137
1138         msg->msg_ev.status = status;
1139
1140         if (lnet_is_health_check(msg)) {
1141                 /*
1142                  * Check the health status of the message. If it has one
1143                  * of the errors that we're supposed to handle, and it has
1144                  * not timed out, then
1145                  *      1. Decrement the appropriate health_value
1146                  *      2. queue the message on the resend queue
1147
1148                  * if the message send is success, timed out or failed in the
1149                  * health check for any reason then we'll just finalize the
1150                  * message. Otherwise just return since the message has been
1151                  * put on the resend queue.
1152                  */
1153                 if (!lnet_health_check(msg))
1154                         return;
1155         }
1156
1157         /*
1158          * We're not going to resend this message so detach its MD and invoke
1159          * the appropriate callbacks
1160          */
1161         if (msg->msg_md != NULL)
1162                 lnet_msg_detach_md(msg, status);
1163
1164 again:
1165         if (!msg->msg_tx_committed && !msg->msg_rx_committed) {
1166                 /* not committed to network yet */
1167                 LASSERT(!msg->msg_onactivelist);
1168                 lnet_msg_free(msg);
1169                 return;
1170         }
1171
1172         /*
1173          * NB: routed message can be committed for both receiving and sending,
1174          * we should finalize in LIFO order and keep counters correct.
1175          * (finalize sending first then finalize receiving)
1176          */
1177         cpt = msg->msg_tx_committed ? msg->msg_tx_cpt : msg->msg_rx_cpt;
1178         lnet_net_lock(cpt);
1179
1180         container = the_lnet.ln_msg_containers[cpt];
1181
1182         /* Recursion breaker.  Don't complete the message here if I am (or
1183          * enough other threads are) already completing messages */
1184         my_slot = lnet_check_finalize_recursion_locked(msg,
1185                                                 &container->msc_finalizing,
1186                                                 container->msc_nfinalizers,
1187                                                 container->msc_finalizers);
1188
1189         /* enough threads are resending */
1190         if (my_slot == -1) {
1191                 lnet_net_unlock(cpt);
1192                 return;
1193         }
1194
1195         rc = 0;
1196         while (!list_empty(&container->msc_finalizing)) {
1197                 msg = list_entry(container->msc_finalizing.next,
1198                                  struct lnet_msg, msg_list);
1199
1200                 list_del_init(&msg->msg_list);
1201
1202                 /* NB drops and regains the lnet lock if it actually does
1203                  * anything, so my finalizing friends can chomp along too */
1204                 rc = lnet_complete_msg_locked(msg, cpt);
1205                 if (rc != 0)
1206                         break;
1207         }
1208
1209         if (unlikely(!list_empty(&the_lnet.ln_delay_rules))) {
1210                 lnet_net_unlock(cpt);
1211                 lnet_delay_rule_check();
1212                 lnet_net_lock(cpt);
1213         }
1214
1215         container->msc_finalizers[my_slot] = NULL;
1216         lnet_net_unlock(cpt);
1217
1218         if (rc != 0)
1219                 goto again;
1220 }
1221 EXPORT_SYMBOL(lnet_finalize);
1222
1223 void
1224 lnet_msg_container_cleanup(struct lnet_msg_container *container)
1225 {
1226         int     count = 0;
1227
1228         if (container->msc_init == 0)
1229                 return;
1230
1231         while (!list_empty(&container->msc_active)) {
1232                 struct lnet_msg *msg;
1233
1234                 msg  = list_entry(container->msc_active.next,
1235                                   struct lnet_msg, msg_activelist);
1236                 LASSERT(msg->msg_onactivelist);
1237                 msg->msg_onactivelist = 0;
1238                 list_del_init(&msg->msg_activelist);
1239                 lnet_msg_free(msg);
1240                 count++;
1241         }
1242
1243         if (count > 0)
1244                 CERROR("%d active msg on exit\n", count);
1245
1246         if (container->msc_finalizers != NULL) {
1247                 CFS_FREE_PTR_ARRAY(container->msc_finalizers,
1248                                    container->msc_nfinalizers);
1249                 container->msc_finalizers = NULL;
1250         }
1251
1252         if (container->msc_resenders != NULL) {
1253                 CFS_FREE_PTR_ARRAY(container->msc_resenders,
1254                                    container->msc_nfinalizers);
1255                 container->msc_resenders = NULL;
1256         }
1257         container->msc_init = 0;
1258 }
1259
1260 int
1261 lnet_msg_container_setup(struct lnet_msg_container *container, int cpt)
1262 {
1263         int rc = 0;
1264
1265         container->msc_init = 1;
1266
1267         INIT_LIST_HEAD(&container->msc_active);
1268         INIT_LIST_HEAD(&container->msc_finalizing);
1269         INIT_LIST_HEAD(&container->msc_resending);
1270
1271         /* number of CPUs */
1272         container->msc_nfinalizers = cfs_cpt_weight(lnet_cpt_table(), cpt);
1273         if (container->msc_nfinalizers == 0)
1274                 container->msc_nfinalizers = 1;
1275
1276         LIBCFS_CPT_ALLOC(container->msc_finalizers, lnet_cpt_table(), cpt,
1277                          container->msc_nfinalizers *
1278                          sizeof(*container->msc_finalizers));
1279
1280         if (container->msc_finalizers == NULL) {
1281                 CERROR("Failed to allocate message finalizers\n");
1282                 lnet_msg_container_cleanup(container);
1283                 return -ENOMEM;
1284         }
1285
1286         LIBCFS_CPT_ALLOC(container->msc_resenders, lnet_cpt_table(), cpt,
1287                          container->msc_nfinalizers *
1288                          sizeof(*container->msc_resenders));
1289
1290         if (container->msc_resenders == NULL) {
1291                 CERROR("Failed to allocate message resenders\n");
1292                 lnet_msg_container_cleanup(container);
1293                 return -ENOMEM;
1294         }
1295
1296         return rc;
1297 }
1298
1299 void
1300 lnet_msg_containers_destroy(void)
1301 {
1302         struct lnet_msg_container *container;
1303         int     i;
1304
1305         if (the_lnet.ln_msg_containers == NULL)
1306                 return;
1307
1308         cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers)
1309                 lnet_msg_container_cleanup(container);
1310
1311         cfs_percpt_free(the_lnet.ln_msg_containers);
1312         the_lnet.ln_msg_containers = NULL;
1313 }
1314
1315 int
1316 lnet_msg_containers_create(void)
1317 {
1318         struct lnet_msg_container *container;
1319         int     rc;
1320         int     i;
1321
1322         the_lnet.ln_msg_containers = cfs_percpt_alloc(lnet_cpt_table(),
1323                                                       sizeof(*container));
1324
1325         if (the_lnet.ln_msg_containers == NULL) {
1326                 CERROR("Failed to allocate cpu-partition data for network\n");
1327                 return -ENOMEM;
1328         }
1329
1330         cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers) {
1331                 rc = lnet_msg_container_setup(container, i);
1332                 if (rc != 0) {
1333                         lnet_msg_containers_destroy();
1334                         return rc;
1335                 }
1336         }
1337
1338         return 0;
1339 }