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