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, 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
  33 #define DEBUG_SUBSYSTEM S_RPC
  34
  35 #include <libcfs/libcfs.h>
  36 #include <linux/kernel.h>
  37 #include <linux/delay.h>
  38 #include <obd_class.h>
  39 #include <lustre_net.h>
  40 #include <lustre_sec.h>
  41 #include "ptlrpc_internal.h"
  42
  43 struct lnet_eq *ptlrpc_eq;
  44
  45 /*
  46  *  Client's outgoing request callback
  47  */
  48 void request_out_callback(struct lnet_event *ev)
  49 {
  50         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  51         struct ptlrpc_request *req = cbid->cbid_arg;
  52         bool                   wakeup = false;
  53         ENTRY;
  54
  55         LASSERT(ev->type == LNET_EVENT_SEND || ev->type == LNET_EVENT_UNLINK);
  56         LASSERT(ev->unlinked);
  57
  58         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  59
  60         sptlrpc_request_out_callback(req);
  61
  62         spin_lock(&req->rq_lock);
  63         req->rq_real_sent = ktime_get_real_seconds();
  64         req->rq_req_unlinked = 1;
  65         /* reply_in_callback happened before request_out_callback? */
  66         if (req->rq_reply_unlinked)
  67                 wakeup = true;
  68
  69         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  70                 /* Failed send: make it seem like the reply timed out, just
  71                  * like failing sends in client.c does currently...  */
  72                 req->rq_net_err = 1;
  73                 wakeup = true;
  74         }
  75
  76         if (wakeup)
  77                 ptlrpc_client_wake_req(req);
  78
  79         spin_unlock(&req->rq_lock);
  80
  81         ptlrpc_req_finished(req);
  82         EXIT;
  83 }
  84
  85 /*
  86  * Client's incoming reply callback
  87  */
  88 void reply_in_callback(struct lnet_event *ev)
  89 {
  90         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  91         struct ptlrpc_request *req = cbid->cbid_arg;
  92         ENTRY;
  93
  94         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  95
  96         LASSERT (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
  97         LASSERT (ev->md.start == req->rq_repbuf);
  98         LASSERT (ev->offset + ev->mlength <= req->rq_repbuf_len);
  99         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
 100            for adaptive timeouts' early reply. */
 101         LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
 102
 103         spin_lock(&req->rq_lock);
 104
 105         req->rq_receiving_reply = 0;
 106         req->rq_early = 0;
 107         if (ev->unlinked)
 108                 req->rq_reply_unlinked = 1;
 109
 110         if (ev->status)
 111                 goto out_wake;
 112
 113         if (ev->type == LNET_EVENT_UNLINK) {
 114                 LASSERT(ev->unlinked);
 115                 DEBUG_REQ(D_NET, req, "unlink");
 116                 goto out_wake;
 117         }
 118
 119         if (ev->mlength < ev->rlength ) {
 120                 CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
 121                        req->rq_replen, ev->rlength, ev->offset);
 122                 req->rq_reply_truncated = 1;
 123                 req->rq_replied = 1;
 124                 req->rq_status = -EOVERFLOW;
 125                 req->rq_nob_received = ev->rlength + ev->offset;
 126                 goto out_wake;
 127         }
 128
 129         if ((ev->offset == 0) &&
 130             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 131                 /* Early reply */
 132                 DEBUG_REQ(D_ADAPTTO, req,
 133                           "Early reply received, mlen=%u offset=%d replen=%d replied=%d unlinked=%d",
 134                           ev->mlength, ev->offset,
 135                           req->rq_replen, req->rq_replied, ev->unlinked);
 136
 137                 req->rq_early_count++; /* number received, client side */
 138
 139                 /* already got the real reply or buffers are already unlinked */
 140                 if (req->rq_replied ||
 141                     req->rq_reply_unlinked == 1)
 142                         goto out_wake;
 143
 144                 req->rq_early = 1;
 145                 req->rq_reply_off = ev->offset;
 146                 req->rq_nob_received = ev->mlength;
 147                 /* And we're still receiving */
 148                 req->rq_receiving_reply = 1;
 149         } else {
 150                 /* Real reply */
 151                 req->rq_rep_swab_mask = 0;
 152                 req->rq_replied = 1;
 153                 /* Got reply, no resend required */
 154                 req->rq_resend = 0;
 155                 req->rq_reply_off = ev->offset;
 156                 req->rq_nob_received = ev->mlength;
 157                 /* LNetMDUnlink can't be called under the LNET_LOCK,
 158                    so we must unlink in ptlrpc_unregister_reply */
 159                 DEBUG_REQ(D_INFO, req,
 160                           "reply in flags=%x mlen=%u offset=%d replen=%d",
 161                           lustre_msg_get_flags(req->rq_reqmsg),
 162                           ev->mlength, ev->offset, req->rq_replen);
 163         }
 164
 165         if (lustre_msg_get_opc(req->rq_reqmsg) != OBD_PING)
 166                 req->rq_import->imp_last_reply_time = ktime_get_real_seconds();
 167
 168 out_wake:
 169         /* NB don't unlock till after wakeup; req can disappear under us
 170          * since we don't have our own ref */
 171         ptlrpc_client_wake_req(req);
 172         spin_unlock(&req->rq_lock);
 173         EXIT;
 174 }
 175
 176 /*
 177  * Client's bulk has been written/read
 178  */
 179 void client_bulk_callback(struct lnet_event *ev)
 180 {
 181         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 182         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 183         struct ptlrpc_request   *req;
 184         ENTRY;
 185
 186         LASSERT((ptlrpc_is_bulk_put_sink(desc->bd_type) &&
 187                  ev->type == LNET_EVENT_PUT) ||
 188                 (ptlrpc_is_bulk_get_source(desc->bd_type) &&
 189                  ev->type == LNET_EVENT_GET) ||
 190                 ev->type == LNET_EVENT_UNLINK);
 191         LASSERT(ev->unlinked);
 192
 193         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 194                 ev->status = -EIO;
 195
 196         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,CFS_FAIL_ONCE))
 197                 ev->status = -EIO;
 198
 199         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 200                "event type %d, status %d, desc %p\n",
 201                ev->type, ev->status, desc);
 202
 203         spin_lock(&desc->bd_lock);
 204         req = desc->bd_req;
 205         LASSERT(desc->bd_md_count > 0);
 206         desc->bd_md_count--;
 207
 208         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 209                 desc->bd_nob_transferred += ev->mlength;
 210                 desc->bd_sender = ev->sender;
 211         } else {
 212                 /* start reconnect and resend if network error hit */
 213                 spin_lock(&req->rq_lock);
 214                 req->rq_net_err = 1;
 215                 spin_unlock(&req->rq_lock);
 216         }
 217
 218         if (ev->status != 0)
 219                 desc->bd_failure = 1;
 220
 221         /* NB don't unlock till after wakeup; desc can disappear under us
 222          * otherwise */
 223         if (desc->bd_md_count == 0)
 224                 ptlrpc_client_wake_req(desc->bd_req);
 225
 226         spin_unlock(&desc->bd_lock);
 227         EXIT;
 228 }
 229
 230 /*
 231  * We will have percpt request history list for ptlrpc service in upcoming
 232  * patches because we don't want to be serialized by current per-service
 233  * history operations. So we require history ID can (somehow) show arriving
 234  * order w/o grabbing global lock, and user can sort them in userspace.
 235  *
 236  * This is how we generate history ID for ptlrpc_request:
 237  * ----------------------------------------------------
 238  * |  32 bits  |  16 bits  | (16 - X)bits  |  X bits  |
 239  * ----------------------------------------------------
 240  * |  seconds  | usec / 16 |   sequence    | CPT id   |
 241  * ----------------------------------------------------
 242  *
 243  * it might not be precise but should be good enough.
 244  */
 245
 246 #define REQS_CPT_BITS(svcpt)    ((svcpt)->scp_service->srv_cpt_bits)
 247
 248 #define REQS_SEC_SHIFT          32
 249 #define REQS_USEC_SHIFT         16
 250 #define REQS_SEQ_SHIFT(svcpt)   REQS_CPT_BITS(svcpt)
 251
 252 static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
 253                                    struct ptlrpc_request *req)
 254 {
 255         u64 sec = req->rq_arrival_time.tv_sec;
 256         u32 usec = req->rq_arrival_time.tv_nsec / NSEC_PER_USEC / 16; /* usec / 16 */
 257         u64 new_seq;
 258
 259         /* set sequence ID for request and add it to history list,
 260          * it must be called with hold svcpt::scp_lock */
 261
 262         new_seq = (sec << REQS_SEC_SHIFT) |
 263                   (usec << REQS_USEC_SHIFT) |
 264                   (svcpt->scp_cpt < 0 ? 0 : svcpt->scp_cpt);
 265
 266         if (new_seq > svcpt->scp_hist_seq) {
 267                 /* This handles the initial case of scp_hist_seq == 0 or
 268                  * we just jumped into a new time window */
 269                 svcpt->scp_hist_seq = new_seq;
 270         } else {
 271                 LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT);
 272                 /* NB: increase sequence number in current usec bucket,
 273                  * however, it's possible that we used up all bits for
 274                  * sequence and jumped into the next usec bucket (future time),
 275                  * then we hope there will be less RPCs per bucket at some
 276                  * point, and sequence will catch up again */
 277                 svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
 278                 new_seq = svcpt->scp_hist_seq;
 279         }
 280
 281         req->rq_history_seq = new_seq;
 282
 283         list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs);
 284 }
 285
 286 /*
 287  * Server's incoming request callback
 288  */
 289 void request_in_callback(struct lnet_event *ev)
 290 {
 291         struct ptlrpc_cb_id               *cbid = ev->md.user_ptr;
 292         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 293         struct ptlrpc_service_part        *svcpt = rqbd->rqbd_svcpt;
 294         struct ptlrpc_service             *service = svcpt->scp_service;
 295         struct ptlrpc_request             *req;
 296         ENTRY;
 297
 298         LASSERT (ev->type == LNET_EVENT_PUT ||
 299                  ev->type == LNET_EVENT_UNLINK);
 300         LASSERT ((char *)ev->md.start >= rqbd->rqbd_buffer);
 301         LASSERT ((char *)ev->md.start + ev->offset + ev->mlength <=
 302                  rqbd->rqbd_buffer + service->srv_buf_size);
 303
 304         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 305                "event type %d, status %d, service %s\n",
 306                ev->type, ev->status, service->srv_name);
 307
 308         if (ev->unlinked) {
 309                 /* If this is the last request message to fit in the
 310                  * request buffer we can use the request object embedded in
 311                  * rqbd.  Note that if we failed to allocate a request,
 312                  * we'd have to re-post the rqbd, which we can't do in this
 313                  * context. */
 314                 req = &rqbd->rqbd_req;
 315                 memset(req, 0, sizeof (*req));
 316         } else {
 317                 LASSERT (ev->type == LNET_EVENT_PUT);
 318                 if (ev->status != 0) {
 319                         /* We moaned above already... */
 320                         return;
 321                 }
 322                 req = ptlrpc_request_cache_alloc(GFP_ATOMIC);
 323                 if (req == NULL) {
 324                         CERROR("Can't allocate incoming request descriptor: "
 325                                "Dropping %s RPC from %s\n",
 326                                service->srv_name,
 327                                libcfs_id2str(ev->initiator));
 328                         return;
 329                 }
 330         }
 331
 332         ptlrpc_srv_req_init(req);
 333         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 334          * flags are reset and scalars are zero.  We only set the message
 335          * size to non-zero if this was a successful receive. */
 336         req->rq_xid = ev->match_bits;
 337         req->rq_reqbuf = ev->md.start + ev->offset;
 338         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 339                 req->rq_reqdata_len = ev->mlength;
 340         ktime_get_real_ts64(&req->rq_arrival_time);
 341         /* Multi-Rail: keep track of both initiator and source NID. */
 342         req->rq_peer = ev->initiator;
 343         req->rq_source = ev->source;
 344         req->rq_self = ev->target.nid;
 345         req->rq_rqbd = rqbd;
 346         req->rq_phase = RQ_PHASE_NEW;
 347         if (ev->type == LNET_EVENT_PUT)
 348                 CDEBUG(D_INFO, "incoming req@%p x%llu msgsize %u\n",
 349                        req, req->rq_xid, ev->mlength);
 350
 351         CDEBUG(D_RPCTRACE, "peer: %s (source: %s)\n",
 352                 libcfs_id2str(req->rq_peer), libcfs_id2str(req->rq_source));
 353
 354         spin_lock(&svcpt->scp_lock);
 355
 356         ptlrpc_req_add_history(svcpt, req);
 357
 358         if (ev->unlinked) {
 359                 svcpt->scp_nrqbds_posted--;
 360                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 361                        svcpt->scp_nrqbds_posted);
 362
 363                 /* Normally, don't complain about 0 buffers posted; LNET won't
 364                  * drop incoming reqs since we set the portal lazy */
 365                 if (test_req_buffer_pressure &&
 366                     ev->type != LNET_EVENT_UNLINK &&
 367                     svcpt->scp_nrqbds_posted == 0)
 368                         CWARN("All %s request buffers busy\n",
 369                               service->srv_name);
 370
 371                 /* req takes over the network's ref on rqbd */
 372         } else {
 373                 /* req takes a ref on rqbd */
 374                 rqbd->rqbd_refcount++;
 375         }
 376
 377         list_add_tail(&req->rq_list, &svcpt->scp_req_incoming);
 378         svcpt->scp_nreqs_incoming++;
 379
 380         /* NB everything can disappear under us once the request
 381          * has been queued and we unlock, so do the wake now... */
 382         wake_up(&svcpt->scp_waitq);
 383
 384         spin_unlock(&svcpt->scp_lock);
 385         EXIT;
 386 }
 387
 388 /*
 389  *  Server's outgoing reply callback
 390  */
 391 void reply_out_callback(struct lnet_event *ev)
 392 {
 393         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 394         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 395         struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 396         ENTRY;
 397
 398         LASSERT (ev->type == LNET_EVENT_SEND ||
 399                  ev->type == LNET_EVENT_ACK ||
 400                  ev->type == LNET_EVENT_UNLINK);
 401
 402         if (!rs->rs_difficult) {
 403                 /* 'Easy' replies have no further processing so I drop the
 404                  * net's ref on 'rs' */
 405                 LASSERT (ev->unlinked);
 406                 ptlrpc_rs_decref(rs);
 407                 EXIT;
 408                 return;
 409         }
 410
 411         LASSERT (rs->rs_on_net);
 412
 413         if (ev->unlinked) {
 414                 /* Last network callback. The net's ref on 'rs' stays put
 415                  * until ptlrpc_handle_rs() is done with it */
 416                 spin_lock(&svcpt->scp_rep_lock);
 417                 spin_lock(&rs->rs_lock);
 418
 419                 rs->rs_on_net = 0;
 420                 if (!rs->rs_no_ack ||
 421                     rs->rs_transno <=
 422                     rs->rs_export->exp_obd->obd_last_committed ||
 423                     list_empty(&rs->rs_obd_list))
 424                         ptlrpc_schedule_difficult_reply(rs);
 425
 426                 spin_unlock(&rs->rs_lock);
 427                 spin_unlock(&svcpt->scp_rep_lock);
 428         }
 429         EXIT;
 430 }
 431
 432 #ifdef HAVE_SERVER_SUPPORT
 433 /*
 434  * Server's bulk completion callback
 435  */
 436 void server_bulk_callback(struct lnet_event *ev)
 437 {
 438         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 439         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 440         ENTRY;
 441
 442         LASSERT(ev->type == LNET_EVENT_SEND ||
 443                 ev->type == LNET_EVENT_UNLINK ||
 444                 (ptlrpc_is_bulk_put_source(desc->bd_type) &&
 445                  ev->type == LNET_EVENT_ACK) ||
 446                 (ptlrpc_is_bulk_get_sink(desc->bd_type) &&
 447                  ev->type == LNET_EVENT_REPLY));
 448
 449         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 450                "event type %d, status %d, desc %p\n",
 451                ev->type, ev->status, desc);
 452
 453         spin_lock(&desc->bd_lock);
 454
 455         LASSERT(desc->bd_md_count > 0);
 456
 457         if ((ev->type == LNET_EVENT_ACK ||
 458              ev->type == LNET_EVENT_REPLY) &&
 459             ev->status == 0) {
 460                 /* We heard back from the peer, so even if we get this
 461                  * before the SENT event (oh yes we can), we know we
 462                  * read/wrote the peer buffer and how much... */
 463                 desc->bd_nob_transferred += ev->mlength;
 464                 desc->bd_sender = ev->sender;
 465         }
 466
 467         if (ev->status != 0)
 468                 desc->bd_failure = 1;
 469
 470         if (ev->unlinked) {
 471                 desc->bd_md_count--;
 472                 /* This is the last callback no matter what... */
 473                 if (desc->bd_md_count == 0)
 474                         wake_up(&desc->bd_waitq);
 475         }
 476
 477         spin_unlock(&desc->bd_lock);
 478         EXIT;
 479 }
 480 #endif
 481
 482 static void ptlrpc_master_callback(struct lnet_event *ev)
 483 {
 484         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 485         void (*callback)(struct lnet_event *ev) = cbid->cbid_fn;
 486
 487         /* Honestly, it's best to find out early. */
 488         LASSERT (cbid->cbid_arg != LP_POISON);
 489         LASSERT (callback == request_out_callback ||
 490                  callback == reply_in_callback ||
 491                  callback == client_bulk_callback ||
 492                  callback == request_in_callback ||
 493                  callback == reply_out_callback
 494 #ifdef HAVE_SERVER_SUPPORT
 495                  || callback == server_bulk_callback
 496 #endif
 497                  );
 498
 499         callback (ev);
 500 }
 501
 502 int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
 503                         struct lnet_process_id *peer, lnet_nid_t *self)
 504 {
 505         int               best_dist = 0;
 506         __u32             best_order = 0;
 507         int               count = 0;
 508         int               rc = -ENOENT;
 509         int               dist;
 510         __u32             order;
 511         lnet_nid_t        dst_nid;
 512         lnet_nid_t        src_nid;
 513
 514         peer->pid = LNET_PID_LUSTRE;
 515
 516         /* Choose the matching UUID that's closest */
 517         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 518                 if (peer->nid != LNET_NID_ANY && LNET_NIDADDR(peer->nid) == 0 &&
 519                     LNET_NIDNET(dst_nid) != LNET_NIDNET(peer->nid))
 520                         continue;
 521
 522                 dist = LNetDist(dst_nid, &src_nid, &order);
 523                 if (dist < 0)
 524                         continue;
 525
 526                 if (dist == 0) {                /* local! use loopback LND */
 527                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 528                         rc = 0;
 529                         break;
 530                 }
 531
 532                 if (rc < 0 ||
 533                     dist < best_dist ||
 534                     (dist == best_dist && order < best_order)) {
 535                         best_dist = dist;
 536                         best_order = order;
 537
 538                         peer->nid = dst_nid;
 539                         *self = src_nid;
 540                         rc = 0;
 541                 }
 542         }
 543
 544         CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 545         return rc;
 546 }
 547
 548 void ptlrpc_ni_fini(void)
 549 {
 550         int                 rc;
 551         int                 retries;
 552
 553         /* Wait for the event queue to become idle since there may still be
 554          * messages in flight with pending events (i.e. the fire-and-forget
 555          * messages == client requests and "non-difficult" server
 556          * replies */
 557
 558         for (retries = 0;; retries++) {
 559                 rc = LNetEQFree(ptlrpc_eq);
 560                 switch (rc) {
 561                 default:
 562                         LBUG();
 563
 564                 case 0:
 565                         LNetNIFini();
 566                         return;
 567
 568                 case -EBUSY:
 569                         if (retries != 0)
 570                                 CWARN("Event queue still busy\n");
 571
 572                         /* Wait for a bit */
 573                         ssleep(2);
 574                         break;
 575                 }
 576         }
 577         /* notreached */
 578 }
 579
 580 lnet_pid_t ptl_get_pid(void)
 581 {
 582         return LNET_PID_LUSTRE;
 583 }
 584
 585 int ptlrpc_ni_init(void)
 586 {
 587         int              rc;
 588         lnet_pid_t       pid;
 589
 590         pid = ptl_get_pid();
 591         CDEBUG(D_NET, "My pid is: %x\n", pid);
 592
 593         /* We're not passing any limits yet... */
 594         rc = LNetNIInit(pid);
 595         if (rc < 0) {
 596                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 597                 return rc;
 598         }
 599
 600         /* CAVEAT EMPTOR: how we process portals events is _radically_
 601          * different depending on... */
 602         /* kernel LNet calls our master callback when there are new event,
 603          * because we are guaranteed to get every event via callback,
 604          * so we just set EQ size to 0 to avoid overhread of serializing
 605          * enqueue/dequeue operations in LNet. */
 606         ptlrpc_eq = LNetEQAlloc(0, ptlrpc_master_callback);
 607         if (!IS_ERR(ptlrpc_eq))
 608                 return 0;
 609
 610         rc = PTR_ERR(ptlrpc_eq);
 611         CERROR("Failed to allocate event queue: %d\n", rc);
 612         LNetNIFini();
 613
 614         return rc;
 615 }
 616
 617 int ptlrpc_init_portals(void)
 618 {
 619         int   rc = ptlrpc_ni_init();
 620
 621         if (rc != 0) {
 622                 CERROR("network initialisation failed\n");
 623                 return rc;
 624         }
 625         rc = ptlrpcd_addref();
 626         if (rc == 0)
 627                 return 0;
 628
 629         CERROR("rpcd initialisation failed\n");
 630         ptlrpc_ni_fini();
 631         return rc;
 632 }
 633
 634 void ptlrpc_exit_portals(void)
 635 {
 636         ptlrpcd_decref();
 637         ptlrpc_ni_fini();
 638 }