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  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lnet/lnet/lib-msg.c
  33  *
  34  * Message decoding, parsing and finalizing routines
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38
  39 #include <lnet/lib-lnet.h>
  40
  41 void
  42 lnet_build_unlink_event(struct lnet_libmd *md, struct lnet_event *ev)
  43 {
  44         ENTRY;
  45
  46         memset(ev, 0, sizeof(*ev));
  47
  48         ev->status   = 0;
  49         ev->unlinked = 1;
  50         ev->type     = LNET_EVENT_UNLINK;
  51         lnet_md_deconstruct(md, ev);
  52         lnet_md2handle(&ev->md_handle, md);
  53         EXIT;
  54 }
  55
  56 /*
  57  * Don't need any lock, must be called after lnet_commit_md
  58  */
  59 void
  60 lnet_build_msg_event(struct lnet_msg *msg, enum lnet_event_kind ev_type)
  61 {
  62         struct lnet_hdr *hdr = &msg->msg_hdr;
  63         struct lnet_event *ev = &msg->msg_ev;
  64
  65         LASSERT(!msg->msg_routing);
  66
  67         ev->type = ev_type;
  68         ev->msg_type = msg->msg_type;
  69
  70         if (ev_type == LNET_EVENT_SEND) {
  71                 /* event for active message */
  72                 ev->target.nid    = le64_to_cpu(hdr->dest_nid);
  73                 ev->target.pid    = le32_to_cpu(hdr->dest_pid);
  74                 ev->initiator.nid = LNET_NID_ANY;
  75                 ev->initiator.pid = the_lnet.ln_pid;
  76                 ev->source.nid    = LNET_NID_ANY;
  77                 ev->source.pid    = the_lnet.ln_pid;
  78                 ev->sender        = LNET_NID_ANY;
  79         } else {
  80                 /* event for passive message */
  81                 ev->target.pid    = hdr->dest_pid;
  82                 ev->target.nid    = hdr->dest_nid;
  83                 ev->initiator.pid = hdr->src_pid;
  84                 /* Multi-Rail: resolve src_nid to "primary" peer NID */
  85                 ev->initiator.nid = msg->msg_initiator;
  86                 /* Multi-Rail: track source NID. */
  87                 ev->source.pid    = hdr->src_pid;
  88                 ev->source.nid    = hdr->src_nid;
  89                 ev->rlength       = hdr->payload_length;
  90                 ev->sender        = msg->msg_from;
  91                 ev->mlength       = msg->msg_wanted;
  92                 ev->offset        = msg->msg_offset;
  93         }
  94
  95         switch (ev_type) {
  96         default:
  97                 LBUG();
  98
  99         case LNET_EVENT_PUT: /* passive PUT */
 100                 ev->pt_index   = hdr->msg.put.ptl_index;
 101                 ev->match_bits = hdr->msg.put.match_bits;
 102                 ev->hdr_data   = hdr->msg.put.hdr_data;
 103                 return;
 104
 105         case LNET_EVENT_GET: /* passive GET */
 106                 ev->pt_index   = hdr->msg.get.ptl_index;
 107                 ev->match_bits = hdr->msg.get.match_bits;
 108                 ev->hdr_data   = 0;
 109                 return;
 110
 111         case LNET_EVENT_ACK: /* ACK */
 112                 ev->match_bits = hdr->msg.ack.match_bits;
 113                 ev->mlength    = hdr->msg.ack.mlength;
 114                 return;
 115
 116         case LNET_EVENT_REPLY: /* REPLY */
 117                 return;
 118
 119         case LNET_EVENT_SEND: /* active message */
 120                 if (msg->msg_type == LNET_MSG_PUT) {
 121                         ev->pt_index   = le32_to_cpu(hdr->msg.put.ptl_index);
 122                         ev->match_bits = le64_to_cpu(hdr->msg.put.match_bits);
 123                         ev->offset     = le32_to_cpu(hdr->msg.put.offset);
 124                         ev->mlength    =
 125                         ev->rlength    = le32_to_cpu(hdr->payload_length);
 126                         ev->hdr_data   = le64_to_cpu(hdr->msg.put.hdr_data);
 127
 128                 } else {
 129                         LASSERT(msg->msg_type == LNET_MSG_GET);
 130                         ev->pt_index   = le32_to_cpu(hdr->msg.get.ptl_index);
 131                         ev->match_bits = le64_to_cpu(hdr->msg.get.match_bits);
 132                         ev->mlength    =
 133                         ev->rlength    = le32_to_cpu(hdr->msg.get.sink_length);
 134                         ev->offset     = le32_to_cpu(hdr->msg.get.src_offset);
 135                         ev->hdr_data   = 0;
 136                 }
 137                 return;
 138         }
 139 }
 140
 141 void
 142 lnet_msg_commit(struct lnet_msg *msg, int cpt)
 143 {
 144         struct lnet_msg_container *container = the_lnet.ln_msg_containers[cpt];
 145         struct lnet_counters_common *common;
 146         s64 timeout_ns;
 147
 148         /* set the message deadline */
 149         timeout_ns = lnet_transaction_timeout * NSEC_PER_SEC;
 150         msg->msg_deadline = ktime_add_ns(ktime_get(), timeout_ns);
 151
 152         /* routed message can be committed for both receiving and sending */
 153         LASSERT(!msg->msg_tx_committed);
 154
 155         if (msg->msg_sending) {
 156                 LASSERT(!msg->msg_receiving);
 157                 msg->msg_tx_cpt = cpt;
 158                 msg->msg_tx_committed = 1;
 159                 if (msg->msg_rx_committed) { /* routed message REPLY */
 160                         LASSERT(msg->msg_onactivelist);
 161                         return;
 162                 }
 163         } else {
 164                 LASSERT(!msg->msg_sending);
 165                 msg->msg_rx_cpt = cpt;
 166                 msg->msg_rx_committed = 1;
 167         }
 168
 169         LASSERT(!msg->msg_onactivelist);
 170
 171         msg->msg_onactivelist = 1;
 172         list_add_tail(&msg->msg_activelist, &container->msc_active);
 173
 174         common = &the_lnet.ln_counters[cpt]->lct_common;
 175         common->lcc_msgs_alloc++;
 176         if (common->lcc_msgs_alloc > common->lcc_msgs_max)
 177                 common->lcc_msgs_max = common->lcc_msgs_alloc;
 178 }
 179
 180 static void
 181 lnet_msg_decommit_tx(struct lnet_msg *msg, int status)
 182 {
 183         struct lnet_counters_common *common;
 184         struct lnet_event *ev = &msg->msg_ev;
 185
 186         LASSERT(msg->msg_tx_committed);
 187         if (status != 0)
 188                 goto out;
 189
 190         common = &(the_lnet.ln_counters[msg->msg_tx_cpt]->lct_common);
 191         switch (ev->type) {
 192         default: /* routed message */
 193                 LASSERT(msg->msg_routing);
 194                 LASSERT(msg->msg_rx_committed);
 195                 LASSERT(ev->type == 0);
 196
 197                 common->lcc_route_length += msg->msg_len;
 198                 common->lcc_route_count++;
 199                 goto incr_stats;
 200
 201         case LNET_EVENT_PUT:
 202                 /* should have been decommitted */
 203                 LASSERT(!msg->msg_rx_committed);
 204                 /* overwritten while sending ACK */
 205                 LASSERT(msg->msg_type == LNET_MSG_ACK);
 206                 msg->msg_type = LNET_MSG_PUT; /* fix type */
 207                 break;
 208
 209         case LNET_EVENT_SEND:
 210                 LASSERT(!msg->msg_rx_committed);
 211                 if (msg->msg_type == LNET_MSG_PUT)
 212                         common->lcc_send_length += msg->msg_len;
 213                 break;
 214
 215         case LNET_EVENT_GET:
 216                 LASSERT(msg->msg_rx_committed);
 217                 /* overwritten while sending reply, we should never be
 218                  * here for optimized GET */
 219                 LASSERT(msg->msg_type == LNET_MSG_REPLY);
 220                 msg->msg_type = LNET_MSG_GET; /* fix type */
 221                 break;
 222         }
 223
 224         common->lcc_send_count++;
 225
 226 incr_stats:
 227         if (msg->msg_txpeer)
 228                 lnet_incr_stats(&msg->msg_txpeer->lpni_stats,
 229                                 msg->msg_type,
 230                                 LNET_STATS_TYPE_SEND);
 231         if (msg->msg_txni)
 232                 lnet_incr_stats(&msg->msg_txni->ni_stats,
 233                                 msg->msg_type,
 234                                 LNET_STATS_TYPE_SEND);
 235  out:
 236         lnet_return_tx_credits_locked(msg);
 237         msg->msg_tx_committed = 0;
 238 }
 239
 240 static void
 241 lnet_msg_decommit_rx(struct lnet_msg *msg, int status)
 242 {
 243         struct lnet_counters_common *common;
 244         struct lnet_event *ev = &msg->msg_ev;
 245
 246         LASSERT(!msg->msg_tx_committed); /* decommitted or never committed */
 247         LASSERT(msg->msg_rx_committed);
 248
 249         if (status != 0)
 250                 goto out;
 251
 252         common = &(the_lnet.ln_counters[msg->msg_rx_cpt]->lct_common);
 253         switch (ev->type) {
 254         default:
 255                 LASSERT(ev->type == 0);
 256                 LASSERT(msg->msg_routing);
 257                 goto incr_stats;
 258
 259         case LNET_EVENT_ACK:
 260                 LASSERT(msg->msg_type == LNET_MSG_ACK);
 261                 break;
 262
 263         case LNET_EVENT_GET:
 264                 /* type is "REPLY" if it's an optimized GET on passive side,
 265                  * because optimized GET will never be committed for sending,
 266                  * so message type wouldn't be changed back to "GET" by
 267                  * lnet_msg_decommit_tx(), see details in lnet_parse_get() */
 268                 LASSERT(msg->msg_type == LNET_MSG_REPLY ||
 269                         msg->msg_type == LNET_MSG_GET);
 270                 common->lcc_send_length += msg->msg_wanted;
 271                 break;
 272
 273         case LNET_EVENT_PUT:
 274                 LASSERT(msg->msg_type == LNET_MSG_PUT);
 275                 break;
 276
 277         case LNET_EVENT_REPLY:
 278                 /* type is "GET" if it's an optimized GET on active side,
 279                  * see details in lnet_create_reply_msg() */
 280                 LASSERT(msg->msg_type == LNET_MSG_GET ||
 281                         msg->msg_type == LNET_MSG_REPLY);
 282                 break;
 283         }
 284
 285         common->lcc_recv_count++;
 286
 287 incr_stats:
 288         if (msg->msg_rxpeer)
 289                 lnet_incr_stats(&msg->msg_rxpeer->lpni_stats,
 290                                 msg->msg_type,
 291                                 LNET_STATS_TYPE_RECV);
 292         if (msg->msg_rxni)
 293                 lnet_incr_stats(&msg->msg_rxni->ni_stats,
 294                                 msg->msg_type,
 295                                 LNET_STATS_TYPE_RECV);
 296         if (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_REPLY)
 297                 common->lcc_recv_length += msg->msg_wanted;
 298
 299  out:
 300         lnet_return_rx_credits_locked(msg);
 301         msg->msg_rx_committed = 0;
 302 }
 303
 304 void
 305 lnet_msg_decommit(struct lnet_msg *msg, int cpt, int status)
 306 {
 307         int     cpt2 = cpt;
 308
 309         LASSERT(msg->msg_tx_committed || msg->msg_rx_committed);
 310         LASSERT(msg->msg_onactivelist);
 311
 312         if (msg->msg_tx_committed) { /* always decommit for sending first */
 313                 LASSERT(cpt == msg->msg_tx_cpt);
 314                 lnet_msg_decommit_tx(msg, status);
 315         }
 316
 317         if (msg->msg_rx_committed) {
 318                 /* forwarding msg committed for both receiving and sending */
 319                 if (cpt != msg->msg_rx_cpt) {
 320                         lnet_net_unlock(cpt);
 321                         cpt2 = msg->msg_rx_cpt;
 322                         lnet_net_lock(cpt2);
 323                 }
 324                 lnet_msg_decommit_rx(msg, status);
 325         }
 326
 327         list_del(&msg->msg_activelist);
 328         msg->msg_onactivelist = 0;
 329
 330         the_lnet.ln_counters[cpt2]->lct_common.lcc_msgs_alloc--;
 331
 332         if (cpt2 != cpt) {
 333                 lnet_net_unlock(cpt2);
 334                 lnet_net_lock(cpt);
 335         }
 336 }
 337
 338 void
 339 lnet_msg_attach_md(struct lnet_msg *msg, struct lnet_libmd *md,
 340                    unsigned int offset, unsigned int mlen)
 341 {
 342         /* NB: @offset and @len are only useful for receiving */
 343         /* Here, we attach the MD on lnet_msg and mark it busy and
 344          * decrementing its threshold. Come what may, the lnet_msg "owns"
 345          * the MD until a call to lnet_msg_detach_md or lnet_finalize()
 346          * signals completion. */
 347         LASSERT(!msg->msg_routing);
 348
 349         msg->msg_md = md;
 350         if (msg->msg_receiving) { /* committed for receiving */
 351                 msg->msg_offset = offset;
 352                 msg->msg_wanted = mlen;
 353         }
 354
 355         md->md_refcount++;
 356         if (md->md_threshold != LNET_MD_THRESH_INF) {
 357                 LASSERT(md->md_threshold > 0);
 358                 md->md_threshold--;
 359         }
 360
 361         /* build umd in event */
 362         lnet_md2handle(&msg->msg_ev.md_handle, md);
 363         lnet_md_deconstruct(md, &msg->msg_ev);
 364 }
 365
 366 static int
 367 lnet_complete_msg_locked(struct lnet_msg *msg, int cpt)
 368 {
 369         struct lnet_handle_wire ack_wmd;
 370         int                rc;
 371         int                status = msg->msg_ev.status;
 372
 373         LASSERT(msg->msg_onactivelist);
 374
 375         if (status == 0 && msg->msg_ack) {
 376                 /* Only send an ACK if the PUT completed successfully */
 377
 378                 lnet_msg_decommit(msg, cpt, 0);
 379
 380                 msg->msg_ack = 0;
 381                 lnet_net_unlock(cpt);
 382
 383                 LASSERT(msg->msg_ev.type == LNET_EVENT_PUT);
 384                 LASSERT(!msg->msg_routing);
 385
 386                 ack_wmd = msg->msg_hdr.msg.put.ack_wmd;
 387
 388                 lnet_prep_send(msg, LNET_MSG_ACK, msg->msg_ev.source, 0, 0);
 389
 390                 msg->msg_hdr.msg.ack.dst_wmd = ack_wmd;
 391                 msg->msg_hdr.msg.ack.match_bits = msg->msg_ev.match_bits;
 392                 msg->msg_hdr.msg.ack.mlength = cpu_to_le32(msg->msg_ev.mlength);
 393
 394                 rc = lnet_send(msg->msg_ev.target.nid, msg, msg->msg_from);
 395
 396                 lnet_net_lock(cpt);
 397                 /*
 398                  * NB: message is committed for sending, we should return
 399                  * on success because LND will finalize this message later.
 400                  *
 401                  * Also, there is possibility that message is committed for
 402                  * sending and also failed before delivering to LND,
 403                  * i.e: ENOMEM, in that case we can't fall through either
 404                  * because CPT for sending can be different with CPT for
 405                  * receiving, so we should return back to lnet_finalize()
 406                  * to make sure we are locking the correct partition.
 407                  */
 408                 return rc;
 409
 410         } else if (status == 0 &&       /* OK so far */
 411                    (msg->msg_routing && !msg->msg_sending)) {
 412                 /* not forwarded */
 413                 LASSERT(!msg->msg_receiving);   /* called back recv already */
 414                 lnet_net_unlock(cpt);
 415
 416                 rc = lnet_send(LNET_NID_ANY, msg, LNET_NID_ANY);
 417
 418                 lnet_net_lock(cpt);
 419                 /*
 420                  * NB: message is committed for sending, we should return
 421                  * on success because LND will finalize this message later.
 422                  *
 423                  * Also, there is possibility that message is committed for
 424                  * sending and also failed before delivering to LND,
 425                  * i.e: ENOMEM, in that case we can't fall through either:
 426                  * - The rule is message must decommit for sending first if
 427                  *   the it's committed for both sending and receiving
 428                  * - CPT for sending can be different with CPT for receiving,
 429                  *   so we should return back to lnet_finalize() to make
 430                  *   sure we are locking the correct partition.
 431                  */
 432                 return rc;
 433         }
 434
 435         lnet_msg_decommit(msg, cpt, status);
 436         lnet_msg_free(msg);
 437         return 0;
 438 }
 439
 440 static void
 441 lnet_dec_healthv_locked(atomic_t *healthv, int sensitivity)
 442 {
 443         int h = atomic_read(healthv);
 444
 445         if (h < sensitivity) {
 446                 atomic_set(healthv, 0);
 447         } else {
 448                 h -= sensitivity;
 449                 atomic_set(healthv, h);
 450         }
 451 }
 452
 453 static void
 454 lnet_handle_local_failure(struct lnet_ni *local_ni)
 455 {
 456         /*
 457          * the lnet_net_lock(0) is used to protect the addref on the ni
 458          * and the recovery queue.
 459          */
 460         lnet_net_lock(0);
 461         /* the mt could've shutdown and cleaned up the queues */
 462         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING) {
 463                 lnet_net_unlock(0);
 464                 return;
 465         }
 466
 467         lnet_dec_healthv_locked(&local_ni->ni_healthv, lnet_health_sensitivity);
 468         /*
 469          * add the NI to the recovery queue if it's not already there
 470          * and it's health value is actually below the maximum. It's
 471          * possible that the sensitivity might be set to 0, and the health
 472          * value will not be reduced. In this case, there is no reason to
 473          * invoke recovery
 474          */
 475         if (list_empty(&local_ni->ni_recovery) &&
 476             atomic_read(&local_ni->ni_healthv) < LNET_MAX_HEALTH_VALUE) {
 477                 CDEBUG(D_NET, "ni %s added to recovery queue. Health = %d\n",
 478                         libcfs_nid2str(local_ni->ni_nid),
 479                         atomic_read(&local_ni->ni_healthv));
 480                 list_add_tail(&local_ni->ni_recovery,
 481                               &the_lnet.ln_mt_localNIRecovq);
 482                 lnet_ni_addref_locked(local_ni, 0);
 483         }
 484         lnet_net_unlock(0);
 485 }
 486
 487 /* must hold net_lock/0 */
 488 void
 489 lnet_handle_remote_failure_locked(struct lnet_peer_ni *lpni)
 490 {
 491         __u32 sensitivity = lnet_health_sensitivity;
 492         __u32 lp_sensitivity;
 493
 494         /*
 495          * If there is a health sensitivity in the peer then use that
 496          * instead of the globally set one.
 497          */
 498         lp_sensitivity = lpni->lpni_peer_net->lpn_peer->lp_health_sensitivity;
 499         if (lp_sensitivity)
 500                 sensitivity = lp_sensitivity;
 501
 502         lnet_dec_healthv_locked(&lpni->lpni_healthv, sensitivity);
 503
 504         /* update the peer_net's health value */
 505         lnet_update_peer_net_healthv(lpni);
 506
 507         /*
 508          * add the peer NI to the recovery queue if it's not already there
 509          * and it's health value is actually below the maximum. It's
 510          * possible that the sensitivity might be set to 0, and the health
 511          * value will not be reduced. In this case, there is no reason to
 512          * invoke recovery
 513          */
 514         lnet_peer_ni_add_to_recoveryq_locked(lpni,
 515                                              &the_lnet.ln_mt_peerNIRecovq,
 516                                              ktime_get_seconds());
 517 }
 518
 519 static void
 520 lnet_handle_remote_failure(struct lnet_peer_ni *lpni)
 521 {
 522         /* lpni could be NULL if we're in the LOLND case */
 523         if (!lpni)
 524                 return;
 525
 526         lnet_net_lock(0);
 527         /* the mt could've shutdown and cleaned up the queues */
 528         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING) {
 529                 lnet_net_unlock(0);
 530                 return;
 531         }
 532         lnet_handle_remote_failure_locked(lpni);
 533         lnet_net_unlock(0);
 534 }
 535
 536 static void
 537 lnet_incr_hstats(struct lnet_ni *ni, struct lnet_peer_ni *lpni,
 538                  enum lnet_msg_hstatus hstatus)
 539 {
 540         struct lnet_counters_health *health;
 541
 542         health = &the_lnet.ln_counters[0]->lct_health;
 543
 544         switch (hstatus) {
 545         case LNET_MSG_STATUS_LOCAL_INTERRUPT:
 546                 atomic_inc(&ni->ni_hstats.hlt_local_interrupt);
 547                 health->lch_local_interrupt_count++;
 548                 break;
 549         case LNET_MSG_STATUS_LOCAL_DROPPED:
 550                 atomic_inc(&ni->ni_hstats.hlt_local_dropped);
 551                 health->lch_local_dropped_count++;
 552                 break;
 553         case LNET_MSG_STATUS_LOCAL_ABORTED:
 554                 atomic_inc(&ni->ni_hstats.hlt_local_aborted);
 555                 health->lch_local_aborted_count++;
 556                 break;
 557         case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
 558                 atomic_inc(&ni->ni_hstats.hlt_local_no_route);
 559                 health->lch_local_no_route_count++;
 560                 break;
 561         case LNET_MSG_STATUS_LOCAL_TIMEOUT:
 562                 atomic_inc(&ni->ni_hstats.hlt_local_timeout);
 563                 health->lch_local_timeout_count++;
 564                 break;
 565         case LNET_MSG_STATUS_LOCAL_ERROR:
 566                 atomic_inc(&ni->ni_hstats.hlt_local_error);
 567                 health->lch_local_error_count++;
 568                 break;
 569         case LNET_MSG_STATUS_REMOTE_DROPPED:
 570                 if (lpni)
 571                         atomic_inc(&lpni->lpni_hstats.hlt_remote_dropped);
 572                 health->lch_remote_dropped_count++;
 573                 break;
 574         case LNET_MSG_STATUS_REMOTE_ERROR:
 575                 if (lpni)
 576                         atomic_inc(&lpni->lpni_hstats.hlt_remote_error);
 577                 health->lch_remote_error_count++;
 578                 break;
 579         case LNET_MSG_STATUS_REMOTE_TIMEOUT:
 580                 if (lpni)
 581                         atomic_inc(&lpni->lpni_hstats.hlt_remote_timeout);
 582                 health->lch_remote_timeout_count++;
 583                 break;
 584         case LNET_MSG_STATUS_NETWORK_TIMEOUT:
 585                 if (lpni)
 586                         atomic_inc(&lpni->lpni_hstats.hlt_network_timeout);
 587                 health->lch_network_timeout_count++;
 588                 break;
 589         case LNET_MSG_STATUS_OK:
 590                 break;
 591         default:
 592                 LBUG();
 593         }
 594 }
 595
 596 static void
 597 lnet_resend_msg_locked(struct lnet_msg *msg)
 598 {
 599         msg->msg_retry_count++;
 600
 601         /*
 602          * remove message from the active list and reset it to prepare
 603          * for a resend. Two exceptions to this
 604          *
 605          * 1. the router case. When a message is being routed it is
 606          * committed for rx when received and committed for tx when
 607          * forwarded. We don't want to remove it from the active list, since
 608          * code which handles receiving expects it to remain on the active
 609          * list.
 610          *
 611          * 2. The REPLY case. Reply messages use the same message
 612          * structure for the GET that was received.
 613          */
 614         if (!msg->msg_routing && msg->msg_type != LNET_MSG_REPLY) {
 615                 list_del_init(&msg->msg_activelist);
 616                 msg->msg_onactivelist = 0;
 617         }
 618         /*
 619          * The msg_target.nid which was originally set
 620          * when calling LNetGet() or LNetPut() might've
 621          * been overwritten if we're routing this message.
 622          * Call lnet_msg_decommit_tx() to return the credit
 623          * this message consumed. The message will
 624          * consume another credit when it gets resent.
 625          */
 626         msg->msg_target.nid = msg->msg_hdr.dest_nid;
 627         lnet_msg_decommit_tx(msg, -EAGAIN);
 628         msg->msg_sending = 0;
 629         msg->msg_receiving = 0;
 630         msg->msg_target_is_router = 0;
 631
 632         CDEBUG(D_NET, "%s->%s:%s:%s - queuing msg (%p) for resend\n",
 633                libcfs_nid2str(msg->msg_hdr.src_nid),
 634                libcfs_nid2str(msg->msg_hdr.dest_nid),
 635                lnet_msgtyp2str(msg->msg_type),
 636                lnet_health_error2str(msg->msg_health_status), msg);
 637
 638         list_add_tail(&msg->msg_list, the_lnet.ln_mt_resendqs[msg->msg_tx_cpt]);
 639
 640         complete(&the_lnet.ln_mt_wait_complete);
 641 }
 642
 643 int
 644 lnet_check_finalize_recursion_locked(struct lnet_msg *msg,
 645                                      struct list_head *containerq,
 646                                      int nworkers, void **workers)
 647 {
 648         int my_slot = -1;
 649         int i;
 650
 651         list_add_tail(&msg->msg_list, containerq);
 652
 653         for (i = 0; i < nworkers; i++) {
 654                 if (workers[i] == current)
 655                         break;
 656
 657                 if (my_slot < 0 && workers[i] == NULL)
 658                         my_slot = i;
 659         }
 660
 661         if (i < nworkers || my_slot < 0)
 662                 return -1;
 663
 664         workers[my_slot] = current;
 665
 666         return my_slot;
 667 }
 668
 669 int
 670 lnet_attempt_msg_resend(struct lnet_msg *msg)
 671 {
 672         struct lnet_msg_container *container;
 673         int my_slot;
 674         int cpt;
 675
 676         /* we can only resend tx_committed messages */
 677         LASSERT(msg->msg_tx_committed);
 678
 679         /* don't resend recovery messages */
 680         if (msg->msg_recovery) {
 681                 CDEBUG(D_NET, "msg %s->%s is a recovery ping. retry# %d\n",
 682                         libcfs_nid2str(msg->msg_from),
 683                         libcfs_nid2str(msg->msg_target.nid),
 684                         msg->msg_retry_count);
 685                 return -ENOTRECOVERABLE;
 686         }
 687
 688         /*
 689          * if we explicitly indicated we don't want to resend then just
 690          * return
 691          */
 692         if (msg->msg_no_resend) {
 693                 CDEBUG(D_NET, "msg %s->%s requested no resend. retry# %d\n",
 694                         libcfs_nid2str(msg->msg_from),
 695                         libcfs_nid2str(msg->msg_target.nid),
 696                         msg->msg_retry_count);
 697                 return -ENOTRECOVERABLE;
 698         }
 699
 700         /* check if the message has exceeded the number of retries */
 701         if (msg->msg_retry_count >= lnet_retry_count) {
 702                 CNETERR("msg %s->%s exceeded retry count %d\n",
 703                         libcfs_nid2str(msg->msg_from),
 704                         libcfs_nid2str(msg->msg_target.nid),
 705                         msg->msg_retry_count);
 706                 return -ENOTRECOVERABLE;
 707         }
 708
 709         cpt = msg->msg_tx_cpt;
 710         lnet_net_lock(cpt);
 711
 712         /* check again under lock */
 713         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING) {
 714                 lnet_net_unlock(cpt);
 715                 return -ESHUTDOWN;
 716         }
 717
 718         container = the_lnet.ln_msg_containers[cpt];
 719         my_slot =
 720                 lnet_check_finalize_recursion_locked(msg,
 721                                         &container->msc_resending,
 722                                         container->msc_nfinalizers,
 723                                         container->msc_resenders);
 724
 725         /* enough threads are resending */
 726         if (my_slot == -1) {
 727                 lnet_net_unlock(cpt);
 728                 return 0;
 729         }
 730
 731         while (!list_empty(&container->msc_resending)) {
 732                 msg = list_entry(container->msc_resending.next,
 733                                         struct lnet_msg, msg_list);
 734                 list_del(&msg->msg_list);
 735
 736                 /*
 737                  * resending the message will require us to call
 738                  * lnet_msg_decommit_tx() which will return the credit
 739                  * which this message holds. This could trigger another
 740                  * queued message to be sent. If that message fails and
 741                  * requires a resend we will recurse.
 742                  * But since at this point the slot is taken, the message
 743                  * will be queued in the container and dealt with
 744                  * later. This breaks the recursion.
 745                  */
 746                 lnet_resend_msg_locked(msg);
 747         }
 748
 749         /*
 750          * msc_resenders is an array of process pointers. Each entry holds
 751          * a pointer to the current process operating on the message. An
 752          * array entry is created per CPT. If the array slot is already
 753          * set, then it means that there is a thread on the CPT currently
 754          * resending a message.
 755          * Once the thread finishes clear the slot to enable the thread to
 756          * take on more resend work.
 757          */
 758         container->msc_resenders[my_slot] = NULL;
 759         lnet_net_unlock(cpt);
 760
 761         return 0;
 762 }
 763
 764 /*
 765  * Do a health check on the message:
 766  * return -1 if we're not going to handle the error or
 767  *   if we've reached the maximum number of retries.
 768  *   success case will return -1 as well
 769  * return 0 if it the message is requeued for send
 770  */
 771 static int
 772 lnet_health_check(struct lnet_msg *msg)
 773 {
 774         enum lnet_msg_hstatus hstatus = msg->msg_health_status;
 775         struct lnet_peer_ni *lpni;
 776         struct lnet_ni *ni;
 777         bool lo = false;
 778         bool attempt_local_resend;
 779         bool attempt_remote_resend;
 780         bool handle_local_health;
 781         bool handle_remote_health;
 782
 783         /* if we're shutting down no point in handling health. */
 784         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
 785                 return -1;
 786
 787         LASSERT(msg->msg_tx_committed || msg->msg_rx_committed);
 788
 789         /*
 790          * if we're sending to the LOLND then the msg_txpeer will not be
 791          * set. So no need to sanity check it.
 792          */
 793         if (msg->msg_tx_committed && msg->msg_txni->ni_nid != LNET_NID_LO_0)
 794                 LASSERT(msg->msg_txpeer);
 795         else if (msg->msg_tx_committed &&
 796                  msg->msg_txni->ni_nid == LNET_NID_LO_0)
 797                 lo = true;
 798
 799         if (hstatus != LNET_MSG_STATUS_OK &&
 800             ktime_compare(ktime_get(), msg->msg_deadline) >= 0)
 801                 return -1;
 802
 803         /*
 804          * always prefer txni/txpeer if they message is committed for both
 805          * directions.
 806          */
 807         if (msg->msg_tx_committed) {
 808                 ni = msg->msg_txni;
 809                 lpni = msg->msg_txpeer;
 810                 attempt_local_resend = attempt_remote_resend = true;
 811         } else {
 812                 ni = msg->msg_rxni;
 813                 lpni = msg->msg_rxpeer;
 814                 attempt_local_resend = attempt_remote_resend = false;
 815         }
 816
 817         /* Don't further decrement the health value if a recovery message
 818          * failed.
 819          */
 820         if (msg->msg_recovery)
 821                 handle_local_health = handle_remote_health = false;
 822         else
 823                 handle_local_health = handle_remote_health = true;
 824
 825         /* For local failures, health/recovery/resends are not needed if I only
 826          * have a single (non-lolnd) interface. NB: pb_nnis includes the lolnd
 827          * interface, so a single-rail node would have pb_nnis == 2.
 828          */
 829         if (the_lnet.ln_ping_target->pb_nnis <= 2) {
 830                 handle_local_health = false;
 831                 attempt_local_resend = false;
 832         }
 833
 834         /* For remote failures, health/recovery/resends are not needed if the
 835          * peer only has a single interface. Special case for routers where we
 836          * rely on health feature to manage route aliveness. NB: unlike pb_nnis
 837          * above, lp_nnis does _not_ include the lolnd, so a single-rail node
 838          * would have lp_nnis == 1.
 839          */
 840         if (lpni && lpni->lpni_peer_net->lpn_peer->lp_nnis <= 1) {
 841                 attempt_remote_resend = false;
 842                 if (!lnet_isrouter(lpni))
 843                         handle_remote_health = false;
 844         }
 845
 846         if (!lo)
 847                 LASSERT(ni && lpni);
 848         else
 849                 LASSERT(ni);
 850
 851         CDEBUG(D_NET, "health check: %s->%s: %s: %s\n",
 852                libcfs_nid2str(ni->ni_nid),
 853                (lo) ? "self" : libcfs_nid2str(lpni->lpni_nid),
 854                lnet_msgtyp2str(msg->msg_type),
 855                lnet_health_error2str(hstatus));
 856
 857         /*
 858          * stats are only incremented for errors so avoid wasting time
 859          * incrementing statistics if there is no error.
 860          */
 861         if (hstatus != LNET_MSG_STATUS_OK) {
 862                 lnet_net_lock(0);
 863                 lnet_incr_hstats(ni, lpni, hstatus);
 864                 lnet_net_unlock(0);
 865         }
 866
 867         switch (hstatus) {
 868         case LNET_MSG_STATUS_OK:
 869                 /*
 870                  * increment the local ni health weather we successfully
 871                  * received or sent a message on it.
 872                  */
 873                 lnet_inc_healthv(&ni->ni_healthv, lnet_health_sensitivity);
 874                 /*
 875                  * It's possible msg_txpeer is NULL in the LOLND
 876                  * case. Only increment the peer's health if we're
 877                  * receiving a message from it. It's the only sure way to
 878                  * know that a remote interface is up.
 879                  * If this interface is part of a router, then take that
 880                  * as indication that the router is fully healthy.
 881                  */
 882                 if (lpni && msg->msg_rx_committed) {
 883                         /*
 884                          * If we're receiving a message from the router or
 885                          * I'm a router, then set that lpni's health to
 886                          * maximum so we can commence communication
 887                          */
 888                         lnet_net_lock(0);
 889                         if (lnet_isrouter(lpni) || the_lnet.ln_routing) {
 890                                 lnet_set_lpni_healthv_locked(lpni,
 891                                         LNET_MAX_HEALTH_VALUE);
 892                         } else {
 893                                 __u32 sensitivity = lpni->lpni_peer_net->
 894                                         lpn_peer->lp_health_sensitivity;
 895
 896                                 lnet_inc_lpni_healthv_locked(lpni,
 897                                         (sensitivity) ? sensitivity :
 898                                         lnet_health_sensitivity);
 899                                 /* This peer NI may have previously aged out
 900                                  * of recovery. Now that we've received a
 901                                  * message from it, we can continue recovery
 902                                  * if its health value is still below the
 903                                  * maximum.
 904                                  */
 905                                 lnet_peer_ni_add_to_recoveryq_locked(lpni,
 906                                                 &the_lnet.ln_mt_peerNIRecovq,
 907                                                 ktime_get_seconds());
 908                         }
 909                         lnet_net_unlock(0);
 910                 }
 911
 912                 /* we can finalize this message */
 913                 return -1;
 914         case LNET_MSG_STATUS_LOCAL_INTERRUPT:
 915         case LNET_MSG_STATUS_LOCAL_DROPPED:
 916         case LNET_MSG_STATUS_LOCAL_ABORTED:
 917         case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
 918         case LNET_MSG_STATUS_LOCAL_TIMEOUT:
 919                 if (handle_local_health)
 920                         lnet_handle_local_failure(ni);
 921                 if (attempt_local_resend)
 922                         return lnet_attempt_msg_resend(msg);
 923                 break;
 924         case LNET_MSG_STATUS_LOCAL_ERROR:
 925                 if (handle_local_health)
 926                         lnet_handle_local_failure(ni);
 927                 return -1;
 928         case LNET_MSG_STATUS_REMOTE_DROPPED:
 929                 if (handle_remote_health)
 930                         lnet_handle_remote_failure(lpni);
 931                 if (attempt_remote_resend)
 932                         return lnet_attempt_msg_resend(msg);
 933                 break;
 934         case LNET_MSG_STATUS_REMOTE_ERROR:
 935         case LNET_MSG_STATUS_REMOTE_TIMEOUT:
 936                 if (handle_remote_health)
 937                         lnet_handle_remote_failure(lpni);
 938                 return -1;
 939         case LNET_MSG_STATUS_NETWORK_TIMEOUT:
 940                 if (handle_remote_health)
 941                         lnet_handle_remote_failure(lpni);
 942                 if (handle_local_health)
 943                         lnet_handle_local_failure(ni);
 944                 return -1;
 945         default:
 946                 LBUG();
 947         }
 948
 949         /* no resend is needed */
 950         return -1;
 951 }
 952
 953 static void
 954 lnet_msg_detach_md(struct lnet_msg *msg, int status)
 955 {
 956         struct lnet_libmd *md = msg->msg_md;
 957         lnet_handler_t handler = NULL;
 958         int cpt = lnet_cpt_of_cookie(md->md_lh.lh_cookie);
 959         int unlink;
 960
 961         lnet_res_lock(cpt);
 962         while (md->md_flags & LNET_MD_FLAG_HANDLING)
 963                 /* An event handler is running - wait for it to
 964                  * complete to avoid races.
 965                  */
 966                 lnet_md_wait_handling(md, cpt);
 967
 968         /* Now it's safe to drop my caller's ref */
 969         md->md_refcount--;
 970         LASSERT(md->md_refcount >= 0);
 971
 972         unlink = lnet_md_unlinkable(md);
 973         if (md->md_handler) {
 974                 if ((md->md_flags & LNET_MD_FLAG_ABORTED) && !status) {
 975                         msg->msg_ev.status   = -ETIMEDOUT;
 976                         CDEBUG(D_NET, "md 0x%p already unlinked\n", md);
 977                 } else {
 978                         msg->msg_ev.status   = status;
 979                 }
 980                 msg->msg_ev.unlinked = unlink;
 981                 handler = md->md_handler;
 982                 if (!unlink)
 983                         md->md_flags |= LNET_MD_FLAG_HANDLING;
 984         }
 985
 986         if (unlink || (md->md_refcount == 0 &&
 987                        md->md_threshold == LNET_MD_THRESH_INF))
 988                 lnet_detach_rsp_tracker(md, cpt);
 989
 990         msg->msg_md = NULL;
 991         if (unlink)
 992                 lnet_md_unlink(md);
 993
 994         lnet_res_unlock(cpt);
 995
 996         if (handler) {
 997                 handler(&msg->msg_ev);
 998                 if (!unlink) {
 999                         lnet_res_lock(cpt);
1000                         md->md_flags &= ~LNET_MD_FLAG_HANDLING;
1001                         wake_up_var(md);
1002                         lnet_res_unlock(cpt);
1003                 }
1004         }
1005 }
1006
1007 static bool
1008 lnet_is_health_check(struct lnet_msg *msg)
1009 {
1010         bool hc = true;
1011         int status = msg->msg_ev.status;
1012
1013         if ((!msg->msg_tx_committed && !msg->msg_rx_committed) ||
1014             !msg->msg_onactivelist) {
1015                 CDEBUG(D_NET, "msg %p not committed for send or receive\n",
1016                        msg);
1017                 return false;
1018         }
1019
1020         if ((msg->msg_tx_committed && !msg->msg_txpeer) ||
1021             (msg->msg_rx_committed && !msg->msg_rxpeer)) {
1022                 /* The optimized GET case does not set msg_rxpeer, but status
1023                  * could be zero. Only print the error message if we have a
1024                  * non-zero status.
1025                  */
1026                 if (status)
1027                         CDEBUG(D_NET, "msg %p status %d cannot retry\n", msg,
1028                                status);
1029                 return false;
1030         }
1031
1032         /* Check for status inconsistencies */
1033         if ((!status && msg->msg_health_status != LNET_MSG_STATUS_OK) ||
1034              (status && msg->msg_health_status == LNET_MSG_STATUS_OK)) {
1035                 CDEBUG(D_NET, "Msg %p is in inconsistent state, don't perform health "
1036                        "checking (%d, %d)\n", msg, status,
1037                        msg->msg_health_status);
1038                 hc = false;
1039         }
1040
1041         CDEBUG(D_NET, "health check = %d, status = %d, hstatus = %d\n",
1042                hc, status, msg->msg_health_status);
1043
1044         return hc;
1045 }
1046
1047 char *
1048 lnet_health_error2str(enum lnet_msg_hstatus hstatus)
1049 {
1050         switch (hstatus) {
1051         case LNET_MSG_STATUS_LOCAL_INTERRUPT:
1052                 return "LOCAL_INTERRUPT";
1053         case LNET_MSG_STATUS_LOCAL_DROPPED:
1054                 return "LOCAL_DROPPED";
1055         case LNET_MSG_STATUS_LOCAL_ABORTED:
1056                 return "LOCAL_ABORTED";
1057         case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
1058                 return "LOCAL_NO_ROUTE";
1059         case LNET_MSG_STATUS_LOCAL_TIMEOUT:
1060                 return "LOCAL_TIMEOUT";
1061         case LNET_MSG_STATUS_LOCAL_ERROR:
1062                 return "LOCAL_ERROR";
1063         case LNET_MSG_STATUS_REMOTE_DROPPED:
1064                 return "REMOTE_DROPPED";
1065         case LNET_MSG_STATUS_REMOTE_ERROR:
1066                 return "REMOTE_ERROR";
1067         case LNET_MSG_STATUS_REMOTE_TIMEOUT:
1068                 return "REMOTE_TIMEOUT";
1069         case LNET_MSG_STATUS_NETWORK_TIMEOUT:
1070                 return "NETWORK_TIMEOUT";
1071         case LNET_MSG_STATUS_OK:
1072                 return "OK";
1073         default:
1074                 return "<UNKNOWN>";
1075         }
1076 }
1077
1078 bool
1079 lnet_send_error_simulation(struct lnet_msg *msg,
1080                            enum lnet_msg_hstatus *hstatus)
1081 {
1082         if (!msg)
1083                 return false;
1084
1085         if (list_empty(&the_lnet.ln_drop_rules))
1086             return false;
1087
1088         /* match only health rules */
1089         if (!lnet_drop_rule_match(&msg->msg_hdr, LNET_NID_ANY,
1090                                   hstatus))
1091                 return false;
1092
1093         CDEBUG(D_NET, "src %s(%s)->dst %s: %s simulate health error: %s\n",
1094                 libcfs_nid2str(msg->msg_hdr.src_nid),
1095                 libcfs_nid2str(msg->msg_txni->ni_nid),
1096                 libcfs_nid2str(msg->msg_hdr.dest_nid),
1097                 lnet_msgtyp2str(msg->msg_type),
1098                 lnet_health_error2str(*hstatus));
1099
1100         return true;
1101 }
1102 EXPORT_SYMBOL(lnet_send_error_simulation);
1103
1104 void
1105 lnet_finalize(struct lnet_msg *msg, int status)
1106 {
1107         struct lnet_msg_container *container;
1108         int my_slot;
1109         int cpt;
1110         int rc;
1111
1112         LASSERT(!in_interrupt());
1113
1114         if (msg == NULL)
1115                 return;
1116
1117         msg->msg_ev.status = status;
1118
1119         if (lnet_is_health_check(msg)) {
1120                 /*
1121                  * Check the health status of the message. If it has one
1122                  * of the errors that we're supposed to handle, and it has
1123                  * not timed out, then
1124                  *      1. Decrement the appropriate health_value
1125                  *      2. queue the message on the resend queue
1126
1127                  * if the message send is success, timed out or failed in the
1128                  * health check for any reason then we'll just finalize the
1129                  * message. Otherwise just return since the message has been
1130                  * put on the resend queue.
1131                  */
1132                 if (!lnet_health_check(msg))
1133                         return;
1134         }
1135
1136         /*
1137          * We're not going to resend this message so detach its MD and invoke
1138          * the appropriate callbacks
1139          */
1140         if (msg->msg_md != NULL)
1141                 lnet_msg_detach_md(msg, status);
1142
1143 again:
1144         if (!msg->msg_tx_committed && !msg->msg_rx_committed) {
1145                 /* not committed to network yet */
1146                 LASSERT(!msg->msg_onactivelist);
1147                 lnet_msg_free(msg);
1148                 return;
1149         }
1150
1151         /*
1152          * NB: routed message can be committed for both receiving and sending,
1153          * we should finalize in LIFO order and keep counters correct.
1154          * (finalize sending first then finalize receiving)
1155          */
1156         cpt = msg->msg_tx_committed ? msg->msg_tx_cpt : msg->msg_rx_cpt;
1157         lnet_net_lock(cpt);
1158
1159         container = the_lnet.ln_msg_containers[cpt];
1160
1161         /* Recursion breaker.  Don't complete the message here if I am (or
1162          * enough other threads are) already completing messages */
1163         my_slot = lnet_check_finalize_recursion_locked(msg,
1164                                                 &container->msc_finalizing,
1165                                                 container->msc_nfinalizers,
1166                                                 container->msc_finalizers);
1167
1168         /* enough threads are resending */
1169         if (my_slot == -1) {
1170                 lnet_net_unlock(cpt);
1171                 return;
1172         }
1173
1174         rc = 0;
1175         while (!list_empty(&container->msc_finalizing)) {
1176                 msg = list_entry(container->msc_finalizing.next,
1177                                  struct lnet_msg, msg_list);
1178
1179                 list_del_init(&msg->msg_list);
1180
1181                 /* NB drops and regains the lnet lock if it actually does
1182                  * anything, so my finalizing friends can chomp along too */
1183                 rc = lnet_complete_msg_locked(msg, cpt);
1184                 if (rc != 0)
1185                         break;
1186         }
1187
1188         if (unlikely(!list_empty(&the_lnet.ln_delay_rules))) {
1189                 lnet_net_unlock(cpt);
1190                 lnet_delay_rule_check();
1191                 lnet_net_lock(cpt);
1192         }
1193
1194         container->msc_finalizers[my_slot] = NULL;
1195         lnet_net_unlock(cpt);
1196
1197         if (rc != 0)
1198                 goto again;
1199 }
1200 EXPORT_SYMBOL(lnet_finalize);
1201
1202 void
1203 lnet_msg_container_cleanup(struct lnet_msg_container *container)
1204 {
1205         int     count = 0;
1206
1207         if (container->msc_init == 0)
1208                 return;
1209
1210         while (!list_empty(&container->msc_active)) {
1211                 struct lnet_msg *msg;
1212
1213                 msg  = list_entry(container->msc_active.next,
1214                                   struct lnet_msg, msg_activelist);
1215                 LASSERT(msg->msg_onactivelist);
1216                 msg->msg_onactivelist = 0;
1217                 list_del_init(&msg->msg_activelist);
1218                 lnet_msg_free(msg);
1219                 count++;
1220         }
1221
1222         if (count > 0)
1223                 CERROR("%d active msg on exit\n", count);
1224
1225         if (container->msc_finalizers != NULL) {
1226                 CFS_FREE_PTR_ARRAY(container->msc_finalizers,
1227                                    container->msc_nfinalizers);
1228                 container->msc_finalizers = NULL;
1229         }
1230
1231         if (container->msc_resenders != NULL) {
1232                 CFS_FREE_PTR_ARRAY(container->msc_resenders,
1233                                    container->msc_nfinalizers);
1234                 container->msc_resenders = NULL;
1235         }
1236         container->msc_init = 0;
1237 }
1238
1239 int
1240 lnet_msg_container_setup(struct lnet_msg_container *container, int cpt)
1241 {
1242         int rc = 0;
1243
1244         container->msc_init = 1;
1245
1246         INIT_LIST_HEAD(&container->msc_active);
1247         INIT_LIST_HEAD(&container->msc_finalizing);
1248         INIT_LIST_HEAD(&container->msc_resending);
1249
1250         /* number of CPUs */
1251         container->msc_nfinalizers = cfs_cpt_weight(lnet_cpt_table(), cpt);
1252         if (container->msc_nfinalizers == 0)
1253                 container->msc_nfinalizers = 1;
1254
1255         LIBCFS_CPT_ALLOC(container->msc_finalizers, lnet_cpt_table(), cpt,
1256                          container->msc_nfinalizers *
1257                          sizeof(*container->msc_finalizers));
1258
1259         if (container->msc_finalizers == NULL) {
1260                 CERROR("Failed to allocate message finalizers\n");
1261                 lnet_msg_container_cleanup(container);
1262                 return -ENOMEM;
1263         }
1264
1265         LIBCFS_CPT_ALLOC(container->msc_resenders, lnet_cpt_table(), cpt,
1266                          container->msc_nfinalizers *
1267                          sizeof(*container->msc_resenders));
1268
1269         if (container->msc_resenders == NULL) {
1270                 CERROR("Failed to allocate message resenders\n");
1271                 lnet_msg_container_cleanup(container);
1272                 return -ENOMEM;
1273         }
1274
1275         return rc;
1276 }
1277
1278 void
1279 lnet_msg_containers_destroy(void)
1280 {
1281         struct lnet_msg_container *container;
1282         int     i;
1283
1284         if (the_lnet.ln_msg_containers == NULL)
1285                 return;
1286
1287         cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers)
1288                 lnet_msg_container_cleanup(container);
1289
1290         cfs_percpt_free(the_lnet.ln_msg_containers);
1291         the_lnet.ln_msg_containers = NULL;
1292 }
1293
1294 int
1295 lnet_msg_containers_create(void)
1296 {
1297         struct lnet_msg_container *container;
1298         int     rc;
1299         int     i;
1300
1301         the_lnet.ln_msg_containers = cfs_percpt_alloc(lnet_cpt_table(),
1302                                                       sizeof(*container));
1303
1304         if (the_lnet.ln_msg_containers == NULL) {
1305                 CERROR("Failed to allocate cpu-partition data for network\n");
1306                 return -ENOMEM;
1307         }
1308
1309         cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers) {
1310                 rc = lnet_msg_container_setup(container, i);
1311                 if (rc != 0) {
1312                         lnet_msg_containers_destroy();
1313                         return rc;
1314                 }
1315         }
1316
1317         return 0;
1318 }