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 <obd_class.h>
  38 #include <lustre_net.h>
  39 #include <lustre_sec.h>
  40 #include "ptlrpc_internal.h"
  41
  42 struct lnet_handle_eq ptlrpc_eq_h;
  43
  44 /*
  45  *  Client's outgoing request callback
  46  */
  47 void request_out_callback(struct lnet_event *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 = ktime_get_real_seconds();
  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(struct lnet_event *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 = ktime_get_real_seconds();
 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(struct lnet_event *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_nsec / NSEC_PER_USEC / 16; /* 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(struct lnet_event *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         ktime_get_real_ts64(&req->rq_arrival_time);
 339         /* Multi-Rail: keep track of both initiator and source NID. */
 340         req->rq_peer = ev->initiator;
 341         req->rq_source = ev->source;
 342         req->rq_self = ev->target.nid;
 343         req->rq_rqbd = rqbd;
 344         req->rq_phase = RQ_PHASE_NEW;
 345         if (ev->type == LNET_EVENT_PUT)
 346                 CDEBUG(D_INFO, "incoming req@%p x%llu msgsize %u\n",
 347                        req, req->rq_xid, ev->mlength);
 348
 349         CDEBUG(D_RPCTRACE, "peer: %s (source: %s)\n",
 350                 libcfs_id2str(req->rq_peer), libcfs_id2str(req->rq_source));
 351
 352         spin_lock(&svcpt->scp_lock);
 353
 354         ptlrpc_req_add_history(svcpt, req);
 355
 356         if (ev->unlinked) {
 357                 svcpt->scp_nrqbds_posted--;
 358                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 359                        svcpt->scp_nrqbds_posted);
 360
 361                 /* Normally, don't complain about 0 buffers posted; LNET won't
 362                  * drop incoming reqs since we set the portal lazy */
 363                 if (test_req_buffer_pressure &&
 364                     ev->type != LNET_EVENT_UNLINK &&
 365                     svcpt->scp_nrqbds_posted == 0)
 366                         CWARN("All %s request buffers busy\n",
 367                               service->srv_name);
 368
 369                 /* req takes over the network's ref on rqbd */
 370         } else {
 371                 /* req takes a ref on rqbd */
 372                 rqbd->rqbd_refcount++;
 373         }
 374
 375         list_add_tail(&req->rq_list, &svcpt->scp_req_incoming);
 376         svcpt->scp_nreqs_incoming++;
 377
 378         /* NB everything can disappear under us once the request
 379          * has been queued and we unlock, so do the wake now... */
 380         wake_up(&svcpt->scp_waitq);
 381
 382         spin_unlock(&svcpt->scp_lock);
 383         EXIT;
 384 }
 385
 386 /*
 387  *  Server's outgoing reply callback
 388  */
 389 void reply_out_callback(struct lnet_event *ev)
 390 {
 391         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 392         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 393         struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 394         ENTRY;
 395
 396         LASSERT (ev->type == LNET_EVENT_SEND ||
 397                  ev->type == LNET_EVENT_ACK ||
 398                  ev->type == LNET_EVENT_UNLINK);
 399
 400         if (!rs->rs_difficult) {
 401                 /* 'Easy' replies have no further processing so I drop the
 402                  * net's ref on 'rs' */
 403                 LASSERT (ev->unlinked);
 404                 ptlrpc_rs_decref(rs);
 405                 EXIT;
 406                 return;
 407         }
 408
 409         LASSERT (rs->rs_on_net);
 410
 411         if (ev->unlinked) {
 412                 /* Last network callback. The net's ref on 'rs' stays put
 413                  * until ptlrpc_handle_rs() is done with it */
 414                 spin_lock(&svcpt->scp_rep_lock);
 415                 spin_lock(&rs->rs_lock);
 416
 417                 rs->rs_on_net = 0;
 418                 if (!rs->rs_no_ack ||
 419                     rs->rs_transno <=
 420                     rs->rs_export->exp_obd->obd_last_committed ||
 421                     list_empty(&rs->rs_obd_list))
 422                         ptlrpc_schedule_difficult_reply(rs);
 423
 424                 spin_unlock(&rs->rs_lock);
 425                 spin_unlock(&svcpt->scp_rep_lock);
 426         }
 427         EXIT;
 428 }
 429
 430 #ifdef HAVE_SERVER_SUPPORT
 431 /*
 432  * Server's bulk completion callback
 433  */
 434 void server_bulk_callback(struct lnet_event *ev)
 435 {
 436         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 437         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 438         ENTRY;
 439
 440         LASSERT(ev->type == LNET_EVENT_SEND ||
 441                 ev->type == LNET_EVENT_UNLINK ||
 442                 (ptlrpc_is_bulk_put_source(desc->bd_type) &&
 443                  ev->type == LNET_EVENT_ACK) ||
 444                 (ptlrpc_is_bulk_get_sink(desc->bd_type) &&
 445                  ev->type == LNET_EVENT_REPLY));
 446
 447         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 448                "event type %d, status %d, desc %p\n",
 449                ev->type, ev->status, desc);
 450
 451         spin_lock(&desc->bd_lock);
 452
 453         LASSERT(desc->bd_md_count > 0);
 454
 455         if ((ev->type == LNET_EVENT_ACK ||
 456              ev->type == LNET_EVENT_REPLY) &&
 457             ev->status == 0) {
 458                 /* We heard back from the peer, so even if we get this
 459                  * before the SENT event (oh yes we can), we know we
 460                  * read/wrote the peer buffer and how much... */
 461                 desc->bd_nob_transferred += ev->mlength;
 462                 desc->bd_sender = ev->sender;
 463         }
 464
 465         if (ev->status != 0)
 466                 desc->bd_failure = 1;
 467
 468         if (ev->unlinked) {
 469                 desc->bd_md_count--;
 470                 /* This is the last callback no matter what... */
 471                 if (desc->bd_md_count == 0)
 472                         wake_up(&desc->bd_waitq);
 473         }
 474
 475         spin_unlock(&desc->bd_lock);
 476         EXIT;
 477 }
 478 #endif
 479
 480 static void ptlrpc_master_callback(struct lnet_event *ev)
 481 {
 482         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 483         void (*callback)(struct lnet_event *ev) = cbid->cbid_fn;
 484
 485         /* Honestly, it's best to find out early. */
 486         LASSERT (cbid->cbid_arg != LP_POISON);
 487         LASSERT (callback == request_out_callback ||
 488                  callback == reply_in_callback ||
 489                  callback == client_bulk_callback ||
 490                  callback == request_in_callback ||
 491                  callback == reply_out_callback
 492 #ifdef HAVE_SERVER_SUPPORT
 493                  || callback == server_bulk_callback
 494 #endif
 495                  );
 496
 497         callback (ev);
 498 }
 499
 500 int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
 501                         struct lnet_process_id *peer, lnet_nid_t *self)
 502 {
 503         int               best_dist = 0;
 504         __u32             best_order = 0;
 505         int               count = 0;
 506         int               rc = -ENOENT;
 507         int               dist;
 508         __u32             order;
 509         lnet_nid_t        dst_nid;
 510         lnet_nid_t        src_nid;
 511
 512         peer->pid = LNET_PID_LUSTRE;
 513
 514         /* Choose the matching UUID that's closest */
 515         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 516                 if (peer->nid != LNET_NID_ANY && LNET_NIDADDR(peer->nid) == 0 &&
 517                     LNET_NIDNET(dst_nid) != LNET_NIDNET(peer->nid))
 518                         continue;
 519
 520                 dist = LNetDist(dst_nid, &src_nid, &order);
 521                 if (dist < 0)
 522                         continue;
 523
 524                 if (dist == 0) {                /* local! use loopback LND */
 525                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 526                         rc = 0;
 527                         break;
 528                 }
 529
 530                 if (rc < 0 ||
 531                     dist < best_dist ||
 532                     (dist == best_dist && order < best_order)) {
 533                         best_dist = dist;
 534                         best_order = order;
 535
 536                         peer->nid = dst_nid;
 537                         *self = src_nid;
 538                         rc = 0;
 539                 }
 540         }
 541
 542         CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 543         return rc;
 544 }
 545
 546 void ptlrpc_ni_fini(void)
 547 {
 548         wait_queue_head_t         waitq;
 549         struct l_wait_info  lwi;
 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_h);
 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                         init_waitqueue_head(&waitq);
 574                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 575                         l_wait_event(waitq, 0, &lwi);
 576                         break;
 577                 }
 578         }
 579         /* notreached */
 580 }
 581
 582 lnet_pid_t ptl_get_pid(void)
 583 {
 584         return LNET_PID_LUSTRE;
 585 }
 586
 587 int ptlrpc_ni_init(void)
 588 {
 589         int              rc;
 590         lnet_pid_t       pid;
 591
 592         pid = ptl_get_pid();
 593         CDEBUG(D_NET, "My pid is: %x\n", pid);
 594
 595         /* We're not passing any limits yet... */
 596         rc = LNetNIInit(pid);
 597         if (rc < 0) {
 598                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 599                 return rc;
 600         }
 601
 602         /* CAVEAT EMPTOR: how we process portals events is _radically_
 603          * different depending on... */
 604         /* kernel LNet calls our master callback when there are new event,
 605          * because we are guaranteed to get every event via callback,
 606          * so we just set EQ size to 0 to avoid overhread of serializing
 607          * enqueue/dequeue operations in LNet. */
 608         rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
 609         if (rc == 0)
 610                 return 0;
 611
 612         CERROR ("Failed to allocate event queue: %d\n", rc);
 613         LNetNIFini();
 614
 615         return rc;
 616 }
 617
 618
 619 int ptlrpc_init_portals(void)
 620 {
 621         int   rc = ptlrpc_ni_init();
 622
 623         if (rc != 0) {
 624                 CERROR("network initialisation failed\n");
 625                 return rc;
 626         }
 627         rc = ptlrpcd_addref();
 628         if (rc == 0)
 629                 return 0;
 630
 631         CERROR("rpcd initialisation failed\n");
 632         ptlrpc_ni_fini();
 633         return rc;
 634 }
 635
 636 void ptlrpc_exit_portals(void)
 637 {
 638         ptlrpcd_decref();
 639         ptlrpc_ni_fini();
 640 }