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 lnet_handler_t ptlrpc_handler;
  44 struct percpu_ref ptlrpc_pending;
  45
  46 /*
  47  *  Client's outgoing request callback
  48  */
  49 void request_out_callback(struct lnet_event *ev)
  50 {
  51         struct ptlrpc_cb_id   *cbid = ev->md_user_ptr;
  52         struct ptlrpc_request *req = cbid->cbid_arg;
  53         bool                   wakeup = false;
  54         ENTRY;
  55
  56         LASSERT(ev->type == LNET_EVENT_SEND || ev->type == LNET_EVENT_UNLINK);
  57         LASSERT(ev->unlinked);
  58
  59         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  60
  61         /* Do not update imp_next_ping for connection request */
  62         if (lustre_msg_get_opc(req->rq_reqmsg) !=
  63             req->rq_import->imp_connect_op)
  64                 ptlrpc_pinger_sending_on_import(req->rq_import);
  65
  66         sptlrpc_request_out_callback(req);
  67
  68         spin_lock(&req->rq_lock);
  69         req->rq_real_sent = ktime_get_real_seconds();
  70         req->rq_req_unlinked = 1;
  71         /* reply_in_callback happened before request_out_callback? */
  72         if (req->rq_reply_unlinked)
  73                 wakeup = true;
  74
  75         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  76                 /* Failed send: make it seem like the reply timed out, just
  77                  * like failing sends in client.c does currently...  */
  78                 req->rq_net_err = 1;
  79                 wakeup = true;
  80         }
  81
  82         if (wakeup)
  83                 ptlrpc_client_wake_req(req);
  84
  85         spin_unlock(&req->rq_lock);
  86
  87         ptlrpc_req_finished(req);
  88         EXIT;
  89 }
  90
  91 /*
  92  * Client's incoming reply callback
  93  */
  94 void reply_in_callback(struct lnet_event *ev)
  95 {
  96         struct ptlrpc_cb_id   *cbid = ev->md_user_ptr;
  97         struct ptlrpc_request *req = cbid->cbid_arg;
  98         ENTRY;
  99
 100         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
 101
 102         LASSERT(ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
 103         LASSERT(ev->md_start == req->rq_repbuf);
 104         LASSERT(ev->offset + ev->mlength <= req->rq_repbuf_len);
 105         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
 106          * for adaptive timeouts' early reply.
 107          */
 108         LASSERT((ev->md_options & LNET_MD_MANAGE_REMOTE) != 0);
 109
 110         spin_lock(&req->rq_lock);
 111
 112         req->rq_receiving_reply = 0;
 113         req->rq_early = 0;
 114         if (ev->unlinked)
 115                 req->rq_reply_unlinked = 1;
 116
 117         if (ev->status)
 118                 goto out_wake;
 119
 120         if (ev->type == LNET_EVENT_UNLINK) {
 121                 LASSERT(ev->unlinked);
 122                 DEBUG_REQ(D_NET, req, "unlink");
 123                 goto out_wake;
 124         }
 125
 126         if (ev->mlength < ev->rlength ) {
 127                 CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
 128                        req->rq_replen, ev->rlength, ev->offset);
 129                 req->rq_reply_truncated = 1;
 130                 req->rq_replied = 1;
 131                 req->rq_status = -EOVERFLOW;
 132                 req->rq_nob_received = ev->rlength + ev->offset;
 133                 goto out_wake;
 134         }
 135
 136         if ((ev->offset == 0) &&
 137             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 138                 /* Early reply */
 139                 DEBUG_REQ(D_ADAPTTO, req,
 140                           "Early reply received, mlen=%u offset=%d replen=%d replied=%d unlinked=%d",
 141                           ev->mlength, ev->offset,
 142                           req->rq_replen, req->rq_replied, ev->unlinked);
 143
 144                 req->rq_early_count++; /* number received, client side */
 145
 146                 /* already got the real reply or buffers are already unlinked */
 147                 if (req->rq_replied ||
 148                     req->rq_reply_unlinked == 1)
 149                         goto out_wake;
 150
 151                 req->rq_early = 1;
 152                 req->rq_reply_off = ev->offset;
 153                 req->rq_nob_received = ev->mlength;
 154                 /* And we're still receiving */
 155                 req->rq_receiving_reply = 1;
 156         } else {
 157                 /* Real reply */
 158                 req->rq_rep_swab_mask = 0;
 159                 req->rq_replied = 1;
 160                 /* Got reply, no resend required */
 161                 req->rq_resend = 0;
 162                 req->rq_reply_off = ev->offset;
 163                 req->rq_nob_received = ev->mlength;
 164                 /* LNetMDUnlink can't be called under the LNET_LOCK,
 165                    so we must unlink in ptlrpc_unregister_reply */
 166                 DEBUG_REQ(D_INFO, req,
 167                           "reply in flags=%x mlen=%u offset=%d replen=%d",
 168                           lustre_msg_get_flags(req->rq_reqmsg),
 169                           ev->mlength, ev->offset, req->rq_replen);
 170         }
 171
 172         if (lustre_msg_get_opc(req->rq_reqmsg) != OBD_PING)
 173                 req->rq_import->imp_last_reply_time = ktime_get_real_seconds();
 174
 175 out_wake:
 176         /* NB don't unlock till after wakeup; req can disappear under us
 177          * since we don't have our own ref */
 178         ptlrpc_client_wake_req(req);
 179         spin_unlock(&req->rq_lock);
 180         EXIT;
 181 }
 182
 183 /*
 184  * Client's bulk has been written/read
 185  */
 186 void client_bulk_callback(struct lnet_event *ev)
 187 {
 188         struct ptlrpc_cb_id     *cbid = ev->md_user_ptr;
 189         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 190         struct ptlrpc_request   *req;
 191         ENTRY;
 192
 193         LASSERT((ptlrpc_is_bulk_put_sink(desc->bd_type) &&
 194                  ev->type == LNET_EVENT_PUT) ||
 195                 (ptlrpc_is_bulk_get_source(desc->bd_type) &&
 196                  ev->type == LNET_EVENT_GET) ||
 197                 ev->type == LNET_EVENT_UNLINK);
 198         LASSERT(ev->unlinked);
 199
 200         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 201                 ev->status = -EIO;
 202
 203         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,CFS_FAIL_ONCE))
 204                 ev->status = -EIO;
 205
 206         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 207                "event type %d, status %d, desc %p\n",
 208                ev->type, ev->status, desc);
 209
 210         spin_lock(&desc->bd_lock);
 211         req = desc->bd_req;
 212         LASSERT(desc->bd_refs > 0);
 213         desc->bd_refs--;
 214
 215         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 216                 desc->bd_nob_transferred += ev->mlength;
 217                 desc->bd_sender = ev->sender;
 218         } else {
 219                 /* start reconnect and resend if network error hit */
 220                 spin_lock(&req->rq_lock);
 221                 req->rq_net_err = 1;
 222                 spin_unlock(&req->rq_lock);
 223         }
 224
 225         if (ev->status != 0)
 226                 desc->bd_failure = 1;
 227
 228         /* NB don't unlock till after wakeup; desc can disappear under us
 229          * otherwise */
 230         if (desc->bd_refs == 0)
 231                 ptlrpc_client_wake_req(desc->bd_req);
 232
 233         spin_unlock(&desc->bd_lock);
 234         EXIT;
 235 }
 236
 237 /*
 238  * We will have percpt request history list for ptlrpc service in upcoming
 239  * patches because we don't want to be serialized by current per-service
 240  * history operations. So we require history ID can (somehow) show arriving
 241  * order w/o grabbing global lock, and user can sort them in userspace.
 242  *
 243  * This is how we generate history ID for ptlrpc_request:
 244  * ----------------------------------------------------
 245  * |  32 bits  |  16 bits  | (16 - X)bits  |  X bits  |
 246  * ----------------------------------------------------
 247  * |  seconds  | usec / 16 |   sequence    | CPT id   |
 248  * ----------------------------------------------------
 249  *
 250  * it might not be precise but should be good enough.
 251  */
 252
 253 #define REQS_CPT_BITS(svcpt)    ((svcpt)->scp_service->srv_cpt_bits)
 254
 255 #define REQS_SEC_SHIFT          32
 256 #define REQS_USEC_SHIFT         16
 257 #define REQS_SEQ_SHIFT(svcpt)   REQS_CPT_BITS(svcpt)
 258
 259 static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
 260                                    struct ptlrpc_request *req)
 261 {
 262         u64 sec = req->rq_arrival_time.tv_sec;
 263         u32 usec = req->rq_arrival_time.tv_nsec / NSEC_PER_USEC / 16; /* usec / 16 */
 264         u64 new_seq;
 265
 266         /* set sequence ID for request and add it to history list,
 267          * it must be called with hold svcpt::scp_lock */
 268
 269         new_seq = (sec << REQS_SEC_SHIFT) |
 270                   (usec << REQS_USEC_SHIFT) |
 271                   (svcpt->scp_cpt < 0 ? 0 : svcpt->scp_cpt);
 272
 273         if (new_seq > svcpt->scp_hist_seq) {
 274                 /* This handles the initial case of scp_hist_seq == 0 or
 275                  * we just jumped into a new time window */
 276                 svcpt->scp_hist_seq = new_seq;
 277         } else {
 278                 LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT);
 279                 /* NB: increase sequence number in current usec bucket,
 280                  * however, it's possible that we used up all bits for
 281                  * sequence and jumped into the next usec bucket (future time),
 282                  * then we hope there will be less RPCs per bucket at some
 283                  * point, and sequence will catch up again */
 284                 svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
 285                 new_seq = svcpt->scp_hist_seq;
 286         }
 287
 288         req->rq_history_seq = new_seq;
 289
 290         list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs);
 291 }
 292
 293 /*
 294  * Server's incoming request callback
 295  */
 296 void request_in_callback(struct lnet_event *ev)
 297 {
 298         struct ptlrpc_cb_id               *cbid = ev->md_user_ptr;
 299         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 300         struct ptlrpc_service_part        *svcpt = rqbd->rqbd_svcpt;
 301         struct ptlrpc_service             *service = svcpt->scp_service;
 302         struct ptlrpc_request             *req;
 303         ENTRY;
 304
 305         LASSERT(ev->type == LNET_EVENT_PUT ||
 306                 ev->type == LNET_EVENT_UNLINK);
 307         LASSERT((char *)ev->md_start >= rqbd->rqbd_buffer);
 308         LASSERT((char *)ev->md_start + ev->offset + ev->mlength <=
 309                 rqbd->rqbd_buffer + service->srv_buf_size);
 310
 311         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 312                "event type %d, status %d, service %s\n",
 313                ev->type, ev->status, service->srv_name);
 314
 315         if (ev->unlinked) {
 316                 /* If this is the last request message to fit in the
 317                  * request buffer we can use the request object embedded in
 318                  * rqbd.  Note that if we failed to allocate a request,
 319                  * we'd have to re-post the rqbd, which we can't do in this
 320                  * context. */
 321                 req = &rqbd->rqbd_req;
 322                 memset(req, 0, sizeof (*req));
 323         } else {
 324                 LASSERT (ev->type == LNET_EVENT_PUT);
 325                 if (ev->status != 0) {
 326                         /* We moaned above already... */
 327                         return;
 328                 }
 329                 req = ptlrpc_request_cache_alloc(GFP_ATOMIC);
 330                 if (req == NULL) {
 331                         CERROR("Can't allocate incoming request descriptor: "
 332                                "Dropping %s RPC from %s\n",
 333                                service->srv_name,
 334                                libcfs_id2str(ev->initiator));
 335                         return;
 336                 }
 337         }
 338
 339         ptlrpc_srv_req_init(req);
 340         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 341          * flags are reset and scalars are zero.  We only set the message
 342          * size to non-zero if this was a successful receive. */
 343         req->rq_xid = ev->match_bits;
 344         req->rq_reqbuf = ev->md_start + ev->offset;
 345         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 346                 req->rq_reqdata_len = ev->mlength;
 347         ktime_get_real_ts64(&req->rq_arrival_time);
 348         /* Multi-Rail: keep track of both initiator and source NID. */
 349         req->rq_peer = ev->initiator;
 350         req->rq_source = ev->source;
 351         req->rq_self = ev->target.nid;
 352         req->rq_rqbd = rqbd;
 353         req->rq_phase = RQ_PHASE_NEW;
 354         if (ev->type == LNET_EVENT_PUT)
 355                 CDEBUG(D_INFO, "incoming req@%p x%llu msgsize %u\n",
 356                        req, req->rq_xid, ev->mlength);
 357
 358         CDEBUG(D_RPCTRACE, "peer: %s (source: %s)\n",
 359                 libcfs_id2str(req->rq_peer), libcfs_id2str(req->rq_source));
 360
 361         spin_lock(&svcpt->scp_lock);
 362
 363         ptlrpc_req_add_history(svcpt, req);
 364
 365         if (ev->unlinked) {
 366                 svcpt->scp_nrqbds_posted--;
 367                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 368                        svcpt->scp_nrqbds_posted);
 369
 370                 /* Normally, don't complain about 0 buffers posted; LNET won't
 371                  * drop incoming reqs since we set the portal lazy */
 372                 if (test_req_buffer_pressure &&
 373                     ev->type != LNET_EVENT_UNLINK &&
 374                     svcpt->scp_nrqbds_posted == 0)
 375                         CWARN("All %s request buffers busy\n",
 376                               service->srv_name);
 377
 378                 /* req takes over the network's ref on rqbd */
 379         } else {
 380                 /* req takes a ref on rqbd */
 381                 rqbd->rqbd_refcount++;
 382         }
 383
 384         list_add_tail(&req->rq_list, &svcpt->scp_req_incoming);
 385         svcpt->scp_nreqs_incoming++;
 386
 387         /* NB everything can disappear under us once the request
 388          * has been queued and we unlock, so do the wake now... */
 389         wake_up(&svcpt->scp_waitq);
 390
 391         spin_unlock(&svcpt->scp_lock);
 392         EXIT;
 393 }
 394
 395 /*
 396  *  Server's outgoing reply callback
 397  */
 398 void reply_out_callback(struct lnet_event *ev)
 399 {
 400         struct ptlrpc_cb_id       *cbid = ev->md_user_ptr;
 401         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 402         struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 403         ENTRY;
 404
 405         LASSERT (ev->type == LNET_EVENT_SEND ||
 406                  ev->type == LNET_EVENT_ACK ||
 407                  ev->type == LNET_EVENT_UNLINK);
 408
 409         if (!rs->rs_difficult) {
 410                 /* 'Easy' replies have no further processing so I drop the
 411                  * net's ref on 'rs' */
 412                 LASSERT (ev->unlinked);
 413                 ptlrpc_rs_decref(rs);
 414                 EXIT;
 415                 return;
 416         }
 417
 418         LASSERT (rs->rs_on_net);
 419
 420         if (ev->unlinked) {
 421                 /* Last network callback. The net's ref on 'rs' stays put
 422                  * until ptlrpc_handle_rs() is done with it */
 423                 spin_lock(&svcpt->scp_rep_lock);
 424                 spin_lock(&rs->rs_lock);
 425
 426                 rs->rs_on_net = 0;
 427                 if (!rs->rs_no_ack ||
 428                     rs->rs_transno <=
 429                     rs->rs_export->exp_obd->obd_last_committed ||
 430                     list_empty(&rs->rs_obd_list))
 431                         ptlrpc_schedule_difficult_reply(rs);
 432
 433                 spin_unlock(&rs->rs_lock);
 434                 spin_unlock(&svcpt->scp_rep_lock);
 435         }
 436         EXIT;
 437 }
 438
 439 #ifdef HAVE_SERVER_SUPPORT
 440 /*
 441  * Server's bulk completion callback
 442  */
 443 void server_bulk_callback(struct lnet_event *ev)
 444 {
 445         struct ptlrpc_cb_id     *cbid = ev->md_user_ptr;
 446         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 447         ENTRY;
 448
 449         LASSERT(ev->type == LNET_EVENT_SEND ||
 450                 ev->type == LNET_EVENT_UNLINK ||
 451                 (ptlrpc_is_bulk_put_source(desc->bd_type) &&
 452                  ev->type == LNET_EVENT_ACK) ||
 453                 (ptlrpc_is_bulk_get_sink(desc->bd_type) &&
 454                  ev->type == LNET_EVENT_REPLY));
 455
 456         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 457                "event type %d, status %d, desc %p\n",
 458                ev->type, ev->status, desc);
 459
 460         spin_lock(&desc->bd_lock);
 461
 462         LASSERT(desc->bd_refs > 0);
 463
 464         if ((ev->type == LNET_EVENT_ACK ||
 465              ev->type == LNET_EVENT_REPLY) &&
 466             ev->status == 0) {
 467                 /* We heard back from the peer, so even if we get this
 468                  * before the SENT event (oh yes we can), we know we
 469                  * read/wrote the peer buffer and how much... */
 470                 desc->bd_nob_transferred += ev->mlength;
 471                 desc->bd_sender = ev->sender;
 472         }
 473
 474         if (ev->status != 0)
 475                 desc->bd_failure = 1;
 476
 477         if (ev->unlinked) {
 478                 desc->bd_refs--;
 479                 /* This is the last callback no matter what... */
 480                 if (desc->bd_refs == 0)
 481                         wake_up(&desc->bd_waitq);
 482         }
 483
 484         spin_unlock(&desc->bd_lock);
 485         EXIT;
 486 }
 487 #endif
 488
 489 static void ptlrpc_master_callback(struct lnet_event *ev)
 490 {
 491         struct ptlrpc_cb_id *cbid = ev->md_user_ptr;
 492         void (*callback)(struct lnet_event *ev) = cbid->cbid_fn;
 493
 494         /* Honestly, it's best to find out early. */
 495         LASSERT(cbid->cbid_arg != LP_POISON);
 496         LASSERT(callback == request_out_callback ||
 497                 callback == reply_in_callback ||
 498                 callback == client_bulk_callback ||
 499                 callback == request_in_callback ||
 500                 callback == reply_out_callback
 501 #ifdef HAVE_SERVER_SUPPORT
 502                 || callback == server_bulk_callback
 503 #endif
 504                 );
 505
 506         callback(ev);
 507         if (ev->unlinked)
 508                 percpu_ref_put(&ptlrpc_pending);
 509 }
 510
 511 int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
 512                         struct lnet_process_id *peer, lnet_nid_t *self)
 513 {
 514         int best_dist = 0;
 515         __u32 best_order = 0;
 516         int count = 0;
 517         int rc = -ENOENT;
 518         int dist;
 519         __u32 order;
 520         lnet_nid_t dst_nid;
 521         lnet_nid_t src_nid;
 522
 523         peer->pid = LNET_PID_LUSTRE;
 524
 525         /* Choose the matching UUID that's closest */
 526         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 527                 if (peer->nid != LNET_NID_ANY && LNET_NIDADDR(peer->nid) == 0 &&
 528                     LNET_NIDNET(dst_nid) != LNET_NIDNET(peer->nid))
 529                         continue;
 530
 531                 dist = LNetDist(dst_nid, &src_nid, &order);
 532                 if (dist < 0)
 533                         continue;
 534
 535                 if (dist == 0) {                /* local! use loopback LND */
 536                         peer->nid = *self = LNET_NID_LO_0;
 537                         rc = 0;
 538                         break;
 539                 }
 540
 541                 if (rc < 0 ||
 542                     dist < best_dist ||
 543                     (dist == best_dist && order < best_order)) {
 544                         best_dist = dist;
 545                         best_order = order;
 546
 547                         peer->nid = dst_nid;
 548                         *self = src_nid;
 549                         rc = 0;
 550                 }
 551         }
 552
 553         CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 554         return rc;
 555 }
 556
 557 static struct completion ptlrpc_done;
 558
 559 static void ptlrpc_release(struct percpu_ref *ref)
 560 {
 561         complete(&ptlrpc_done);
 562 }
 563
 564 static void ptlrpc_ni_fini(void)
 565 {
 566         /* Wait for the event queue to become idle since there may still be
 567          * messages in flight with pending events (i.e. the fire-and-forget
 568          * messages == client requests and "non-difficult" server
 569          * replies */
 570
 571         init_completion(&ptlrpc_done);
 572         percpu_ref_kill(&ptlrpc_pending);
 573         wait_for_completion(&ptlrpc_done);
 574
 575         lnet_assert_handler_unused(ptlrpc_handler);
 576         LNetNIFini();
 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, "ptlrpc: Can't init network interface: rc = %d\n",
 596                        rc);
 597                 return rc;
 598         }
 599
 600         rc = percpu_ref_init(&ptlrpc_pending, ptlrpc_release, 0, GFP_KERNEL);
 601         if (rc) {
 602                 CERROR("ptlrpc: Can't init percpu refcount: rc = %d\n", rc);
 603                 return rc;
 604         }
 605         /* CAVEAT EMPTOR: how we process portals events is _radically_
 606          * different depending on...
 607          */
 608         /* kernel LNet calls our master callback when there are new event,
 609          * because we are guaranteed to get every event via callback,
 610          * so we just set EQ size to 0 to avoid overhread of serializing
 611          * enqueue/dequeue operations in LNet. */
 612         ptlrpc_handler = ptlrpc_master_callback;
 613         return 0;
 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 }