lustre/ptlrpc/events.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) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2016, 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
  33 #define DEBUG_SUBSYSTEM S_RPC
  34
  35 #include <libcfs/libcfs.h>
  36 #include <linux/kernel.h>
  37 #include <obd_class.h>
  38 #include <lustre_net.h>
  39 #include <lustre_sec.h>
  40 #include "ptlrpc_internal.h"
  41
  42 lnet_handle_eq_t   ptlrpc_eq_h;
  43
  44 /*
  45  *  Client's outgoing request callback
  46  */
  47 void request_out_callback(lnet_event_t *ev)
  48 {
  49         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  50         struct ptlrpc_request *req = cbid->cbid_arg;
  51         bool                   wakeup = false;
  52         ENTRY;
  53
  54         LASSERT(ev->type == LNET_EVENT_SEND || ev->type == LNET_EVENT_UNLINK);
  55         LASSERT(ev->unlinked);
  56
  57         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  58
  59         sptlrpc_request_out_callback(req);
  60
  61         spin_lock(&req->rq_lock);
  62         req->rq_real_sent = cfs_time_current_sec();
  63         req->rq_req_unlinked = 1;
  64         /* reply_in_callback happened before request_out_callback? */
  65         if (req->rq_reply_unlinked)
  66                 wakeup = true;
  67
  68         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  69                 /* Failed send: make it seem like the reply timed out, just
  70                  * like failing sends in client.c does currently...  */
  71                 req->rq_net_err = 1;
  72                 wakeup = true;
  73         }
  74
  75         if (wakeup)
  76                 ptlrpc_client_wake_req(req);
  77
  78         spin_unlock(&req->rq_lock);
  79
  80         ptlrpc_req_finished(req);
  81         EXIT;
  82 }
  83
  84 /*
  85  * Client's incoming reply callback
  86  */
  87 void reply_in_callback(lnet_event_t *ev)
  88 {
  89         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  90         struct ptlrpc_request *req = cbid->cbid_arg;
  91         ENTRY;
  92
  93         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  94
  95         LASSERT (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
  96         LASSERT (ev->md.start == req->rq_repbuf);
  97         LASSERT (ev->offset + ev->mlength <= req->rq_repbuf_len);
  98         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
  99            for adaptive timeouts' early reply. */
 100         LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
 101
 102         spin_lock(&req->rq_lock);
 103
 104         req->rq_receiving_reply = 0;
 105         req->rq_early = 0;
 106         if (ev->unlinked)
 107                 req->rq_reply_unlinked = 1;
 108
 109         if (ev->status)
 110                 goto out_wake;
 111
 112         if (ev->type == LNET_EVENT_UNLINK) {
 113                 LASSERT(ev->unlinked);
 114                 DEBUG_REQ(D_NET, req, "unlink");
 115                 goto out_wake;
 116         }
 117
 118         if (ev->mlength < ev->rlength ) {
 119                 CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
 120                        req->rq_replen, ev->rlength, ev->offset);
 121                 req->rq_reply_truncated = 1;
 122                 req->rq_replied = 1;
 123                 req->rq_status = -EOVERFLOW;
 124                 req->rq_nob_received = ev->rlength + ev->offset;
 125                 goto out_wake;
 126         }
 127
 128         if ((ev->offset == 0) &&
 129             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 130                 /* Early reply */
 131                 DEBUG_REQ(D_ADAPTTO, req,
 132                           "Early reply received: mlen=%u offset=%d replen=%d "
 133                           "replied=%d unlinked=%d", ev->mlength, ev->offset,
 134                           req->rq_replen, req->rq_replied, ev->unlinked);
 135
 136                 req->rq_early_count++; /* number received, client side */
 137
 138                 /* already got the real reply or buffers are already unlinked */
 139                 if (req->rq_replied ||
 140                     req->rq_reply_unlinked == 1)
 141                         goto out_wake;
 142
 143                 req->rq_early = 1;
 144                 req->rq_reply_off = ev->offset;
 145                 req->rq_nob_received = ev->mlength;
 146                 /* And we're still receiving */
 147                 req->rq_receiving_reply = 1;
 148         } else {
 149                 /* Real reply */
 150                 req->rq_rep_swab_mask = 0;
 151                 req->rq_replied = 1;
 152                 /* Got reply, no resend required */
 153                 req->rq_resend = 0;
 154                 req->rq_reply_off = ev->offset;
 155                 req->rq_nob_received = ev->mlength;
 156                 /* LNetMDUnlink can't be called under the LNET_LOCK,
 157                    so we must unlink in ptlrpc_unregister_reply */
 158                 DEBUG_REQ(D_INFO, req,
 159                           "reply in flags=%x mlen=%u offset=%d replen=%d",
 160                           lustre_msg_get_flags(req->rq_reqmsg),
 161                           ev->mlength, ev->offset, req->rq_replen);
 162         }
 163
 164         req->rq_import->imp_last_reply_time = cfs_time_current_sec();
 165
 166 out_wake:
 167         /* NB don't unlock till after wakeup; req can disappear under us
 168          * since we don't have our own ref */
 169         ptlrpc_client_wake_req(req);
 170         spin_unlock(&req->rq_lock);
 171         EXIT;
 172 }
 173
 174 /*
 175  * Client's bulk has been written/read
 176  */
 177 void client_bulk_callback (lnet_event_t *ev)
 178 {
 179         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 180         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 181         struct ptlrpc_request   *req;
 182         ENTRY;
 183
 184         LASSERT((ptlrpc_is_bulk_put_sink(desc->bd_type) &&
 185                  ev->type == LNET_EVENT_PUT) ||
 186                 (ptlrpc_is_bulk_get_source(desc->bd_type) &&
 187                  ev->type == LNET_EVENT_GET) ||
 188                 ev->type == LNET_EVENT_UNLINK);
 189         LASSERT(ev->unlinked);
 190
 191         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 192                 ev->status = -EIO;
 193
 194         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,CFS_FAIL_ONCE))
 195                 ev->status = -EIO;
 196
 197         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 198                "event type %d, status %d, desc %p\n",
 199                ev->type, ev->status, desc);
 200
 201         spin_lock(&desc->bd_lock);
 202         req = desc->bd_req;
 203         LASSERT(desc->bd_md_count > 0);
 204         desc->bd_md_count--;
 205
 206         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 207                 desc->bd_nob_transferred += ev->mlength;
 208                 desc->bd_sender = ev->sender;
 209         } else {
 210                 /* start reconnect and resend if network error hit */
 211                 spin_lock(&req->rq_lock);
 212                 req->rq_net_err = 1;
 213                 spin_unlock(&req->rq_lock);
 214         }
 215
 216         if (ev->status != 0)
 217                 desc->bd_failure = 1;
 218
 219         /* NB don't unlock till after wakeup; desc can disappear under us
 220          * otherwise */
 221         if (desc->bd_md_count == 0)
 222                 ptlrpc_client_wake_req(desc->bd_req);
 223
 224         spin_unlock(&desc->bd_lock);
 225         EXIT;
 226 }
 227
 228 /*
 229  * We will have percpt request history list for ptlrpc service in upcoming
 230  * patches because we don't want to be serialized by current per-service
 231  * history operations. So we require history ID can (somehow) show arriving
 232  * order w/o grabbing global lock, and user can sort them in userspace.
 233  *
 234  * This is how we generate history ID for ptlrpc_request:
 235  * ----------------------------------------------------
 236  * |  32 bits  |  16 bits  | (16 - X)bits  |  X bits  |
 237  * ----------------------------------------------------
 238  * |  seconds  | usec / 16 |   sequence    | CPT id   |
 239  * ----------------------------------------------------
 240  *
 241  * it might not be precise but should be good enough.
 242  */
 243
 244 #define REQS_CPT_BITS(svcpt)    ((svcpt)->scp_service->srv_cpt_bits)
 245
 246 #define REQS_SEC_SHIFT          32
 247 #define REQS_USEC_SHIFT         16
 248 #define REQS_SEQ_SHIFT(svcpt)   REQS_CPT_BITS(svcpt)
 249
 250 static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
 251                                    struct ptlrpc_request *req)
 252 {
 253         __u64   sec = req->rq_arrival_time.tv_sec;
 254         __u32   usec = req->rq_arrival_time.tv_usec >> 4; /* usec / 16 */
 255         __u64   new_seq;
 256
 257         /* set sequence ID for request and add it to history list,
 258          * it must be called with hold svcpt::scp_lock */
 259
 260         new_seq = (sec << REQS_SEC_SHIFT) |
 261                   (usec << REQS_USEC_SHIFT) |
 262                   (svcpt->scp_cpt < 0 ? 0 : svcpt->scp_cpt);
 263
 264         if (new_seq > svcpt->scp_hist_seq) {
 265                 /* This handles the initial case of scp_hist_seq == 0 or
 266                  * we just jumped into a new time window */
 267                 svcpt->scp_hist_seq = new_seq;
 268         } else {
 269                 LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT);
 270                 /* NB: increase sequence number in current usec bucket,
 271                  * however, it's possible that we used up all bits for
 272                  * sequence and jumped into the next usec bucket (future time),
 273                  * then we hope there will be less RPCs per bucket at some
 274                  * point, and sequence will catch up again */
 275                 svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
 276                 new_seq = svcpt->scp_hist_seq;
 277         }
 278
 279         req->rq_history_seq = new_seq;
 280
 281         list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs);
 282 }
 283
 284 /*
 285  * Server's incoming request callback
 286  */
 287 void request_in_callback(lnet_event_t *ev)
 288 {
 289         struct ptlrpc_cb_id               *cbid = ev->md.user_ptr;
 290         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 291         struct ptlrpc_service_part        *svcpt = rqbd->rqbd_svcpt;
 292         struct ptlrpc_service             *service = svcpt->scp_service;
 293         struct ptlrpc_request             *req;
 294         ENTRY;
 295
 296         LASSERT (ev->type == LNET_EVENT_PUT ||
 297                  ev->type == LNET_EVENT_UNLINK);
 298         LASSERT ((char *)ev->md.start >= rqbd->rqbd_buffer);
 299         LASSERT ((char *)ev->md.start + ev->offset + ev->mlength <=
 300                  rqbd->rqbd_buffer + service->srv_buf_size);
 301
 302         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 303                "event type %d, status %d, service %s\n",
 304                ev->type, ev->status, service->srv_name);
 305
 306         if (ev->unlinked) {
 307                 /* If this is the last request message to fit in the
 308                  * request buffer we can use the request object embedded in
 309                  * rqbd.  Note that if we failed to allocate a request,
 310                  * we'd have to re-post the rqbd, which we can't do in this
 311                  * context. */
 312                 req = &rqbd->rqbd_req;
 313                 memset(req, 0, sizeof (*req));
 314         } else {
 315                 LASSERT (ev->type == LNET_EVENT_PUT);
 316                 if (ev->status != 0) {
 317                         /* We moaned above already... */
 318                         return;
 319                 }
 320                 req = ptlrpc_request_cache_alloc(GFP_ATOMIC);
 321                 if (req == NULL) {
 322                         CERROR("Can't allocate incoming request descriptor: "
 323                                "Dropping %s RPC from %s\n",
 324                                service->srv_name,
 325                                libcfs_id2str(ev->initiator));
 326                         return;
 327                 }
 328         }
 329
 330         ptlrpc_srv_req_init(req);
 331         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 332          * flags are reset and scalars are zero.  We only set the message
 333          * size to non-zero if this was a successful receive. */
 334         req->rq_xid = ev->match_bits;
 335         req->rq_reqbuf = ev->md.start + ev->offset;
 336         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 337                 req->rq_reqdata_len = ev->mlength;
 338         do_gettimeofday(&req->rq_arrival_time);
 339         req->rq_peer = ev->initiator;
 340         req->rq_self = ev->target.nid;
 341         req->rq_rqbd = rqbd;
 342         req->rq_phase = RQ_PHASE_NEW;
 343         if (ev->type == LNET_EVENT_PUT)
 344                 CDEBUG(D_INFO, "incoming req@%p x%llu msgsize %u\n",
 345                        req, req->rq_xid, ev->mlength);
 346
 347         CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
 348
 349         spin_lock(&svcpt->scp_lock);
 350
 351         ptlrpc_req_add_history(svcpt, req);
 352
 353         if (ev->unlinked) {
 354                 svcpt->scp_nrqbds_posted--;
 355                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 356                        svcpt->scp_nrqbds_posted);
 357
 358                 /* Normally, don't complain about 0 buffers posted; LNET won't
 359                  * drop incoming reqs since we set the portal lazy */
 360                 if (test_req_buffer_pressure &&
 361                     ev->type != LNET_EVENT_UNLINK &&
 362                     svcpt->scp_nrqbds_posted == 0)
 363                         CWARN("All %s request buffers busy\n",
 364                               service->srv_name);
 365
 366                 /* req takes over the network's ref on rqbd */
 367         } else {
 368                 /* req takes a ref on rqbd */
 369                 rqbd->rqbd_refcount++;
 370         }
 371
 372         list_add_tail(&req->rq_list, &svcpt->scp_req_incoming);
 373         svcpt->scp_nreqs_incoming++;
 374
 375         /* NB everything can disappear under us once the request
 376          * has been queued and we unlock, so do the wake now... */
 377         wake_up(&svcpt->scp_waitq);
 378
 379         spin_unlock(&svcpt->scp_lock);
 380         EXIT;
 381 }
 382
 383 /*
 384  *  Server's outgoing reply callback
 385  */
 386 void reply_out_callback(lnet_event_t *ev)
 387 {
 388         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 389         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 390         struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 391         ENTRY;
 392
 393         LASSERT (ev->type == LNET_EVENT_SEND ||
 394                  ev->type == LNET_EVENT_ACK ||
 395                  ev->type == LNET_EVENT_UNLINK);
 396
 397         if (!rs->rs_difficult) {
 398                 /* 'Easy' replies have no further processing so I drop the
 399                  * net's ref on 'rs' */
 400                 LASSERT (ev->unlinked);
 401                 ptlrpc_rs_decref(rs);
 402                 EXIT;
 403                 return;
 404         }
 405
 406         LASSERT (rs->rs_on_net);
 407
 408         if (ev->unlinked) {
 409                 /* Last network callback. The net's ref on 'rs' stays put
 410                  * until ptlrpc_handle_rs() is done with it */
 411                 spin_lock(&svcpt->scp_rep_lock);
 412                 spin_lock(&rs->rs_lock);
 413
 414                 rs->rs_on_net = 0;
 415                 if (!rs->rs_no_ack ||
 416                     rs->rs_transno <=
 417                     rs->rs_export->exp_obd->obd_last_committed ||
 418                     list_empty(&rs->rs_obd_list))
 419                         ptlrpc_schedule_difficult_reply(rs);
 420
 421                 spin_unlock(&rs->rs_lock);
 422                 spin_unlock(&svcpt->scp_rep_lock);
 423         }
 424         EXIT;
 425 }
 426
 427 #ifdef HAVE_SERVER_SUPPORT
 428 /*
 429  * Server's bulk completion callback
 430  */
 431 void server_bulk_callback (lnet_event_t *ev)
 432 {
 433         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 434         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 435         ENTRY;
 436
 437         LASSERT(ev->type == LNET_EVENT_SEND ||
 438                 ev->type == LNET_EVENT_UNLINK ||
 439                 (ptlrpc_is_bulk_put_source(desc->bd_type) &&
 440                  ev->type == LNET_EVENT_ACK) ||
 441                 (ptlrpc_is_bulk_get_sink(desc->bd_type) &&
 442                  ev->type == LNET_EVENT_REPLY));
 443
 444         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 445                "event type %d, status %d, desc %p\n",
 446                ev->type, ev->status, desc);
 447
 448         spin_lock(&desc->bd_lock);
 449
 450         LASSERT(desc->bd_md_count > 0);
 451
 452         if ((ev->type == LNET_EVENT_ACK ||
 453              ev->type == LNET_EVENT_REPLY) &&
 454             ev->status == 0) {
 455                 /* We heard back from the peer, so even if we get this
 456                  * before the SENT event (oh yes we can), we know we
 457                  * read/wrote the peer buffer and how much... */
 458                 desc->bd_nob_transferred += ev->mlength;
 459                 desc->bd_sender = ev->sender;
 460         }
 461
 462         if (ev->status != 0)
 463                 desc->bd_failure = 1;
 464
 465         if (ev->unlinked) {
 466                 desc->bd_md_count--;
 467                 /* This is the last callback no matter what... */
 468                 if (desc->bd_md_count == 0)
 469                         wake_up(&desc->bd_waitq);
 470         }
 471
 472         spin_unlock(&desc->bd_lock);
 473         EXIT;
 474 }
 475 #endif
 476
 477 static void ptlrpc_master_callback(lnet_event_t *ev)
 478 {
 479         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 480         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 481
 482         /* Honestly, it's best to find out early. */
 483         LASSERT (cbid->cbid_arg != LP_POISON);
 484         LASSERT (callback == request_out_callback ||
 485                  callback == reply_in_callback ||
 486                  callback == client_bulk_callback ||
 487                  callback == request_in_callback ||
 488                  callback == reply_out_callback
 489 #ifdef HAVE_SERVER_SUPPORT
 490                  || callback == server_bulk_callback
 491 #endif
 492                  );
 493
 494         callback (ev);
 495 }
 496
 497 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 498                          lnet_process_id_t *peer, lnet_nid_t *self)
 499 {
 500         int               best_dist = 0;
 501         __u32             best_order = 0;
 502         int               count = 0;
 503         int               rc = -ENOENT;
 504         int               dist;
 505         __u32             order;
 506         lnet_nid_t        dst_nid;
 507         lnet_nid_t        src_nid;
 508
 509         peer->pid = LNET_PID_LUSTRE;
 510
 511         /* Choose the matching UUID that's closest */
 512         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 513                 if (peer->nid != LNET_NID_ANY && LNET_NIDADDR(peer->nid) == 0 &&
 514                     LNET_NIDNET(dst_nid) != LNET_NIDNET(peer->nid))
 515                         continue;
 516
 517                 dist = LNetDist(dst_nid, &src_nid, &order);
 518                 if (dist < 0)
 519                         continue;
 520
 521                 if (dist == 0) {                /* local! use loopback LND */
 522                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 523                         rc = 0;
 524                         break;
 525                 }
 526
 527                 if (rc < 0 ||
 528                     dist < best_dist ||
 529                     (dist == best_dist && order < best_order)) {
 530                         best_dist = dist;
 531                         best_order = order;
 532
 533                         peer->nid = dst_nid;
 534                         *self = src_nid;
 535                         rc = 0;
 536                 }
 537         }
 538
 539         CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 540         return rc;
 541 }
 542
 543 void ptlrpc_ni_fini(void)
 544 {
 545         wait_queue_head_t         waitq;
 546         struct l_wait_info  lwi;
 547         int                 rc;
 548         int                 retries;
 549
 550         /* Wait for the event queue to become idle since there may still be
 551          * messages in flight with pending events (i.e. the fire-and-forget
 552          * messages == client requests and "non-difficult" server
 553          * replies */
 554
 555         for (retries = 0;; retries++) {
 556                 rc = LNetEQFree(ptlrpc_eq_h);
 557                 switch (rc) {
 558                 default:
 559                         LBUG();
 560
 561                 case 0:
 562                         LNetNIFini();
 563                         return;
 564
 565                 case -EBUSY:
 566                         if (retries != 0)
 567                                 CWARN("Event queue still busy\n");
 568
 569                         /* Wait for a bit */
 570                         init_waitqueue_head(&waitq);
 571                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 572                         l_wait_event(waitq, 0, &lwi);
 573                         break;
 574                 }
 575         }
 576         /* notreached */
 577 }
 578
 579 lnet_pid_t ptl_get_pid(void)
 580 {
 581         return LNET_PID_LUSTRE;
 582 }
 583
 584 int ptlrpc_ni_init(void)
 585 {
 586         int              rc;
 587         lnet_pid_t       pid;
 588
 589         pid = ptl_get_pid();
 590         CDEBUG(D_NET, "My pid is: %x\n", pid);
 591
 592         /* We're not passing any limits yet... */
 593         rc = LNetNIInit(pid);
 594         if (rc < 0) {
 595                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 596                 return rc;
 597         }
 598
 599         /* CAVEAT EMPTOR: how we process portals events is _radically_
 600          * different depending on... */
 601         /* kernel LNet calls our master callback when there are new event,
 602          * because we are guaranteed to get every event via callback,
 603          * so we just set EQ size to 0 to avoid overhread of serializing
 604          * enqueue/dequeue operations in LNet. */
 605         rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
 606         if (rc == 0)
 607                 return 0;
 608
 609         CERROR ("Failed to allocate event queue: %d\n", rc);
 610         LNetNIFini();
 611
 612         return rc;
 613 }
 614
 615
 616 int ptlrpc_init_portals(void)
 617 {
 618         int   rc = ptlrpc_ni_init();
 619
 620         if (rc != 0) {
 621                 CERROR("network initialisation failed\n");
 622                 return rc;
 623         }
 624         rc = ptlrpcd_addref();
 625         if (rc == 0)
 626                 return 0;
 627
 628         CERROR("rpcd initialisation failed\n");
 629         ptlrpc_ni_fini();
 630         return rc;
 631 }
 632
 633 void ptlrpc_exit_portals(void)
 634 {
 635         ptlrpcd_decref();
 636         ptlrpc_ni_fini();
 637 }