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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  */
  34
  35 #define DEBUG_SUBSYSTEM S_RPC
  36
  37 #ifndef __KERNEL__
  38 # include <liblustre.h>
  39 #else
  40 # include <libcfs/libcfs.h>
  41 # ifdef __mips64__
  42 #  include <linux/kernel.h>
  43 # endif
  44 #endif
  45
  46 #include <obd_class.h>
  47 #include <lustre_net.h>
  48 #include <lustre_sec.h>
  49 #include "ptlrpc_internal.h"
  50
  51 lnet_handle_eq_t   ptlrpc_eq_h;
  52
  53 /*
  54  *  Client's outgoing request callback
  55  */
  56 void request_out_callback(lnet_event_t *ev)
  57 {
  58         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  59         struct ptlrpc_request *req = cbid->cbid_arg;
  60         ENTRY;
  61
  62         LASSERT (ev->type == LNET_EVENT_SEND ||
  63                  ev->type == LNET_EVENT_UNLINK);
  64         LASSERT (ev->unlinked);
  65
  66         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  67
  68         sptlrpc_request_out_callback(req);
  69         req->rq_real_sent = cfs_time_current_sec();
  70
  71         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  72
  73                 /* Failed send: make it seem like the reply timed out, just
  74                  * like failing sends in client.c does currently...  */
  75
  76                 cfs_spin_lock(&req->rq_lock);
  77                 req->rq_net_err = 1;
  78                 cfs_spin_unlock(&req->rq_lock);
  79
  80                 ptlrpc_client_wake_req(req);
  81         }
  82
  83         ptlrpc_req_finished(req);
  84
  85         EXIT;
  86 }
  87
  88 /*
  89  * Client's incoming reply callback
  90  */
  91 void reply_in_callback(lnet_event_t *ev)
  92 {
  93         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  94         struct ptlrpc_request *req = cbid->cbid_arg;
  95         ENTRY;
  96
  97         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  98
  99         LASSERT (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
 100         LASSERT (ev->md.start == req->rq_repbuf);
 101         LASSERT (ev->offset + ev->mlength <= req->rq_repbuf_len);
 102         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
 103            for adaptive timeouts' early reply. */
 104         LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
 105
 106         cfs_spin_lock(&req->rq_lock);
 107
 108         req->rq_receiving_reply = 0;
 109         req->rq_early = 0;
 110         if (ev->unlinked)
 111                 req->rq_must_unlink = 0;
 112
 113         if (ev->status)
 114                 goto out_wake;
 115
 116         if (ev->type == LNET_EVENT_UNLINK) {
 117                 LASSERT(ev->unlinked);
 118                 DEBUG_REQ(D_NET, req, "unlink");
 119                 goto out_wake;
 120         }
 121
 122         if (ev->mlength < ev->rlength ) {
 123                 CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
 124                        req->rq_replen, ev->rlength, ev->offset);
 125                 req->rq_reply_truncate = 1;
 126                 req->rq_replied = 1;
 127                 req->rq_status = -EOVERFLOW;
 128                 req->rq_nob_received = ev->rlength + ev->offset;
 129                 goto out_wake;
 130         }
 131
 132         if ((ev->offset == 0) &&
 133             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 134                 /* Early reply */
 135                 DEBUG_REQ(D_ADAPTTO, req,
 136                           "Early reply received: mlen=%u offset=%d replen=%d "
 137                           "replied=%d unlinked=%d", ev->mlength, ev->offset,
 138                           req->rq_replen, req->rq_replied, ev->unlinked);
 139
 140                 req->rq_early_count++; /* number received, client side */
 141
 142                 if (req->rq_replied)   /* already got the real reply */
 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                 req->rq_reply_off = ev->offset;
 155                 req->rq_nob_received = ev->mlength;
 156                 /* LNetMDUnlink can't be called under the LNET_LOCK,
 157                    so we must unlink in ptlrpc_unregister_reply */
 158                 DEBUG_REQ(D_INFO, req,
 159                           "reply in flags=%x mlen=%u offset=%d replen=%d",
 160                           lustre_msg_get_flags(req->rq_reqmsg),
 161                           ev->mlength, ev->offset, req->rq_replen);
 162         }
 163
 164         req->rq_import->imp_last_reply_time = cfs_time_current_sec();
 165
 166 out_wake:
 167         /* NB don't unlock till after wakeup; req can disappear under us
 168          * since we don't have our own ref */
 169         ptlrpc_client_wake_req(req);
 170         cfs_spin_unlock(&req->rq_lock);
 171         EXIT;
 172 }
 173
 174 /*
 175  * Client's bulk has been written/read
 176  */
 177 void client_bulk_callback (lnet_event_t *ev)
 178 {
 179         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 180         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 181         ENTRY;
 182
 183         LASSERT ((desc->bd_type == BULK_PUT_SINK &&
 184                   ev->type == LNET_EVENT_PUT) ||
 185                  (desc->bd_type == BULK_GET_SOURCE &&
 186                   ev->type == LNET_EVENT_GET) ||
 187                  ev->type == LNET_EVENT_UNLINK);
 188         LASSERT (ev->unlinked);
 189
 190         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 191                 ev->status = -EIO;
 192
 193         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,CFS_FAIL_ONCE))
 194                 ev->status = -EIO;
 195
 196         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 197                "event type %d, status %d, desc %p\n",
 198                ev->type, ev->status, desc);
 199
 200         cfs_spin_lock(&desc->bd_lock);
 201
 202         LASSERT(desc->bd_network_rw);
 203         desc->bd_network_rw = 0;
 204
 205         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 206                 desc->bd_success = 1;
 207                 desc->bd_nob_transferred = ev->mlength;
 208                 desc->bd_sender = ev->sender;
 209         }
 210
 211         /* release the encrypted pages for write */
 212         if (desc->bd_req->rq_bulk_write)
 213                 sptlrpc_enc_pool_put_pages(desc);
 214
 215         /* NB don't unlock till after wakeup; desc can disappear under us
 216          * otherwise */
 217         ptlrpc_client_wake_req(desc->bd_req);
 218
 219         cfs_spin_unlock(&desc->bd_lock);
 220         EXIT;
 221 }
 222
 223 /*
 224  * We will have percpt request history list for ptlrpc service in upcoming
 225  * patches because we don't want to be serialized by current per-service
 226  * history operations. So we require history ID can (somehow) show arriving
 227  * order w/o grabbing global lock, and user can sort them in userspace.
 228  *
 229  * This is how we generate history ID for ptlrpc_request:
 230  * ----------------------------------------------------
 231  * |  32 bits  |  16 bits  | (16 - X)bits  |  X bits  |
 232  * ----------------------------------------------------
 233  * |  seconds  | usec / 16 |   sequence    | CPT id   |
 234  * ----------------------------------------------------
 235  *
 236  * it might not be precise but should be good enough.
 237  */
 238
 239 #define REQS_CPT_BITS(svcpt)    ((svcpt)->scp_service->srv_cpt_bits)
 240
 241 #define REQS_SEC_SHIFT          32
 242 #define REQS_USEC_SHIFT         16
 243 #define REQS_SEQ_SHIFT(svcpt)   REQS_CPT_BITS(svcpt)
 244
 245 static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
 246                                    struct ptlrpc_request *req)
 247 {
 248         __u64   sec = req->rq_arrival_time.tv_sec;
 249         __u32   usec = req->rq_arrival_time.tv_usec >> 4; /* usec / 16 */
 250         __u64   new_seq;
 251
 252         /* set sequence ID for request and add it to history list,
 253          * it must be called with hold svcpt::scp_lock */
 254
 255         new_seq = (sec << REQS_SEC_SHIFT) |
 256                   (usec << REQS_USEC_SHIFT) | svcpt->scp_cpt;
 257         if (new_seq > svcpt->scp_hist_seq) {
 258                 /* This handles the initial case of scp_hist_seq == 0 or
 259                  * we just jumped into a new time window */
 260                 svcpt->scp_hist_seq = new_seq;
 261         } else {
 262                 LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT);
 263                 /* NB: increase sequence number in current usec bucket,
 264                  * however, it's possible that we used up all bits for
 265                  * sequence and jumped into the next usec bucket (future time),
 266                  * then we hope there will be less RPCs per bucket at some
 267                  * point, and sequence will catch up again */
 268                 svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
 269                 new_seq = svcpt->scp_hist_seq;
 270         }
 271
 272         req->rq_history_seq = new_seq;
 273
 274         cfs_list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs);
 275 }
 276
 277 /*
 278  * Server's incoming request callback
 279  */
 280 void request_in_callback(lnet_event_t *ev)
 281 {
 282         struct ptlrpc_cb_id               *cbid = ev->md.user_ptr;
 283         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 284         struct ptlrpc_service_part        *svcpt = rqbd->rqbd_svcpt;
 285         struct ptlrpc_service             *service = svcpt->scp_service;
 286         struct ptlrpc_request             *req;
 287         ENTRY;
 288
 289         LASSERT (ev->type == LNET_EVENT_PUT ||
 290                  ev->type == LNET_EVENT_UNLINK);
 291         LASSERT ((char *)ev->md.start >= rqbd->rqbd_buffer);
 292         LASSERT ((char *)ev->md.start + ev->offset + ev->mlength <=
 293                  rqbd->rqbd_buffer + service->srv_buf_size);
 294
 295         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 296                "event type %d, status %d, service %s\n",
 297                ev->type, ev->status, service->srv_name);
 298
 299         if (ev->unlinked) {
 300                 /* If this is the last request message to fit in the
 301                  * request buffer we can use the request object embedded in
 302                  * rqbd.  Note that if we failed to allocate a request,
 303                  * we'd have to re-post the rqbd, which we can't do in this
 304                  * context. */
 305                 req = &rqbd->rqbd_req;
 306                 memset(req, 0, sizeof (*req));
 307         } else {
 308                 LASSERT (ev->type == LNET_EVENT_PUT);
 309                 if (ev->status != 0) {
 310                         /* We moaned above already... */
 311                         return;
 312                 }
 313                 OBD_ALLOC_GFP(req, sizeof(*req), CFS_ALLOC_ATOMIC_TRY);
 314                 if (req == NULL) {
 315                         CERROR("Can't allocate incoming request descriptor: "
 316                                "Dropping %s RPC from %s\n",
 317                                service->srv_name,
 318                                libcfs_id2str(ev->initiator));
 319                         return;
 320                 }
 321         }
 322
 323         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 324          * flags are reset and scalars are zero.  We only set the message
 325          * size to non-zero if this was a successful receive. */
 326         req->rq_xid = ev->match_bits;
 327         req->rq_reqbuf = ev->md.start + ev->offset;
 328         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 329                 req->rq_reqdata_len = ev->mlength;
 330         cfs_gettimeofday(&req->rq_arrival_time);
 331         req->rq_peer = ev->initiator;
 332         req->rq_self = ev->target.nid;
 333         req->rq_rqbd = rqbd;
 334         req->rq_phase = RQ_PHASE_NEW;
 335         cfs_spin_lock_init(&req->rq_lock);
 336         CFS_INIT_LIST_HEAD(&req->rq_timed_list);
 337         CFS_INIT_LIST_HEAD(&req->rq_exp_list);
 338         cfs_atomic_set(&req->rq_refcount, 1);
 339         if (ev->type == LNET_EVENT_PUT)
 340                 CDEBUG(D_INFO, "incoming req@%p x"LPU64" msgsize %u\n",
 341                        req, req->rq_xid, ev->mlength);
 342
 343         CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
 344
 345         cfs_spin_lock(&svcpt->scp_lock);
 346
 347         ptlrpc_req_add_history(svcpt, req);
 348
 349         if (ev->unlinked) {
 350                 svcpt->scp_nrqbds_posted--;
 351                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 352                        svcpt->scp_nrqbds_posted);
 353
 354                 /* Normally, don't complain about 0 buffers posted; LNET won't
 355                  * drop incoming reqs since we set the portal lazy */
 356                 if (test_req_buffer_pressure &&
 357                     ev->type != LNET_EVENT_UNLINK &&
 358                     svcpt->scp_nrqbds_posted == 0)
 359                         CWARN("All %s request buffers busy\n",
 360                               service->srv_name);
 361
 362                 /* req takes over the network's ref on rqbd */
 363         } else {
 364                 /* req takes a ref on rqbd */
 365                 rqbd->rqbd_refcount++;
 366         }
 367
 368         cfs_list_add_tail(&req->rq_list, &svcpt->scp_req_incoming);
 369         svcpt->scp_nreqs_incoming++;
 370
 371         /* NB everything can disappear under us once the request
 372          * has been queued and we unlock, so do the wake now... */
 373         cfs_waitq_signal(&svcpt->scp_waitq);
 374
 375         cfs_spin_unlock(&svcpt->scp_lock);
 376         EXIT;
 377 }
 378
 379 /*
 380  *  Server's outgoing reply callback
 381  */
 382 void reply_out_callback(lnet_event_t *ev)
 383 {
 384         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 385         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 386         struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 387         ENTRY;
 388
 389         LASSERT (ev->type == LNET_EVENT_SEND ||
 390                  ev->type == LNET_EVENT_ACK ||
 391                  ev->type == LNET_EVENT_UNLINK);
 392
 393         if (!rs->rs_difficult) {
 394                 /* 'Easy' replies have no further processing so I drop the
 395                  * net's ref on 'rs' */
 396                 LASSERT (ev->unlinked);
 397                 ptlrpc_rs_decref(rs);
 398                 EXIT;
 399                 return;
 400         }
 401
 402         LASSERT (rs->rs_on_net);
 403
 404         if (ev->unlinked) {
 405                 /* Last network callback. The net's ref on 'rs' stays put
 406                  * until ptlrpc_handle_rs() is done with it */
 407                 cfs_spin_lock(&svcpt->scp_rep_lock);
 408                 cfs_spin_lock(&rs->rs_lock);
 409
 410                 rs->rs_on_net = 0;
 411                 if (!rs->rs_no_ack ||
 412                     rs->rs_transno <=
 413                     rs->rs_export->exp_obd->obd_last_committed)
 414                         ptlrpc_schedule_difficult_reply(rs);
 415
 416                 cfs_spin_unlock(&rs->rs_lock);
 417                 cfs_spin_unlock(&svcpt->scp_rep_lock);
 418         }
 419         EXIT;
 420 }
 421
 422 #ifdef HAVE_SERVER_SUPPORT
 423 /*
 424  * Server's bulk completion callback
 425  */
 426 void server_bulk_callback (lnet_event_t *ev)
 427 {
 428         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 429         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 430         ENTRY;
 431
 432         LASSERT (ev->type == LNET_EVENT_SEND ||
 433                  ev->type == LNET_EVENT_UNLINK ||
 434                  (desc->bd_type == BULK_PUT_SOURCE &&
 435                   ev->type == LNET_EVENT_ACK) ||
 436                  (desc->bd_type == BULK_GET_SINK &&
 437                   ev->type == LNET_EVENT_REPLY));
 438
 439         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 440                "event type %d, status %d, desc %p\n",
 441                ev->type, ev->status, desc);
 442
 443         cfs_spin_lock(&desc->bd_lock);
 444
 445         if ((ev->type == LNET_EVENT_ACK ||
 446              ev->type == LNET_EVENT_REPLY) &&
 447             ev->status == 0) {
 448                 /* We heard back from the peer, so even if we get this
 449                  * before the SENT event (oh yes we can), we know we
 450                  * read/wrote the peer buffer and how much... */
 451                 desc->bd_success = 1;
 452                 desc->bd_nob_transferred = ev->mlength;
 453                 desc->bd_sender = ev->sender;
 454         }
 455
 456         if (ev->unlinked) {
 457                 /* This is the last callback no matter what... */
 458                 desc->bd_network_rw = 0;
 459                 cfs_waitq_signal(&desc->bd_waitq);
 460         }
 461
 462         cfs_spin_unlock(&desc->bd_lock);
 463         EXIT;
 464 }
 465 #endif
 466
 467 static void ptlrpc_master_callback(lnet_event_t *ev)
 468 {
 469         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 470         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 471
 472         /* Honestly, it's best to find out early. */
 473         LASSERT (cbid->cbid_arg != LP_POISON);
 474         LASSERT (callback == request_out_callback ||
 475                  callback == reply_in_callback ||
 476                  callback == client_bulk_callback ||
 477                  callback == request_in_callback ||
 478                  callback == reply_out_callback
 479 #ifdef HAVE_SERVER_SUPPORT
 480                  || callback == server_bulk_callback
 481 #endif
 482                  );
 483
 484         callback (ev);
 485 }
 486
 487 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 488                          lnet_process_id_t *peer, lnet_nid_t *self)
 489 {
 490         int               best_dist = 0;
 491         __u32             best_order = 0;
 492         int               count = 0;
 493         int               rc = -ENOENT;
 494         int               portals_compatibility;
 495         int               dist;
 496         __u32             order;
 497         lnet_nid_t        dst_nid;
 498         lnet_nid_t        src_nid;
 499
 500         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 501
 502         peer->pid = LUSTRE_SRV_LNET_PID;
 503
 504         /* Choose the matching UUID that's closest */
 505         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 506                 dist = LNetDist(dst_nid, &src_nid, &order);
 507                 if (dist < 0)
 508                         continue;
 509
 510                 if (dist == 0) {                /* local! use loopback LND */
 511                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 512                         rc = 0;
 513                         break;
 514                 }
 515
 516                 if (rc < 0 ||
 517                     dist < best_dist ||
 518                     (dist == best_dist && order < best_order)) {
 519                         best_dist = dist;
 520                         best_order = order;
 521
 522                         if (portals_compatibility > 1) {
 523                                 /* Strong portals compatibility: Zero the nid's
 524                                  * NET, so if I'm reading new config logs, or
 525                                  * getting configured by (new) lconf I can
 526                                  * still talk to old servers. */
 527                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 528                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 529                         }
 530                         peer->nid = dst_nid;
 531                         *self = src_nid;
 532                         rc = 0;
 533                 }
 534         }
 535
 536         CDEBUG(D_NET,"%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 537         return rc;
 538 }
 539
 540 void ptlrpc_ni_fini(void)
 541 {
 542         cfs_waitq_t         waitq;
 543         struct l_wait_info  lwi;
 544         int                 rc;
 545         int                 retries;
 546
 547         /* Wait for the event queue to become idle since there may still be
 548          * messages in flight with pending events (i.e. the fire-and-forget
 549          * messages == client requests and "non-difficult" server
 550          * replies */
 551
 552         for (retries = 0;; retries++) {
 553                 rc = LNetEQFree(ptlrpc_eq_h);
 554                 switch (rc) {
 555                 default:
 556                         LBUG();
 557
 558                 case 0:
 559                         LNetNIFini();
 560                         return;
 561
 562                 case -EBUSY:
 563                         if (retries != 0)
 564                                 CWARN("Event queue still busy\n");
 565
 566                         /* Wait for a bit */
 567                         cfs_waitq_init(&waitq);
 568                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 569                         l_wait_event(waitq, 0, &lwi);
 570                         break;
 571                 }
 572         }
 573         /* notreached */
 574 }
 575
 576 lnet_pid_t ptl_get_pid(void)
 577 {
 578         lnet_pid_t        pid;
 579
 580 #ifndef  __KERNEL__
 581         pid = getpid();
 582 #else
 583         pid = LUSTRE_SRV_LNET_PID;
 584 #endif
 585         return pid;
 586 }
 587
 588 int ptlrpc_ni_init(void)
 589 {
 590         int              rc;
 591         lnet_pid_t       pid;
 592
 593         pid = ptl_get_pid();
 594         CDEBUG(D_NET, "My pid is: %x\n", pid);
 595
 596         /* We're not passing any limits yet... */
 597         rc = LNetNIInit(pid);
 598         if (rc < 0) {
 599                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 600                 return (-ENOENT);
 601         }
 602
 603         /* CAVEAT EMPTOR: how we process portals events is _radically_
 604          * different depending on... */
 605 #ifdef __KERNEL__
 606         /* kernel LNet calls our master callback when there are new event,
 607          * because we are guaranteed to get every event via callback,
 608          * so we just set EQ size to 0 to avoid overhread of serializing
 609          * enqueue/dequeue operations in LNet. */
 610         rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
 611 #else
 612         /* liblustre calls the master callback when it removes events from the
 613          * event queue.  The event queue has to be big enough not to drop
 614          * anything */
 615         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &ptlrpc_eq_h);
 616 #endif
 617         if (rc == 0)
 618                 return 0;
 619
 620         CERROR ("Failed to allocate event queue: %d\n", rc);
 621         LNetNIFini();
 622
 623         return (-ENOMEM);
 624 }
 625
 626 #ifndef __KERNEL__
 627 CFS_LIST_HEAD(liblustre_wait_callbacks);
 628 CFS_LIST_HEAD(liblustre_idle_callbacks);
 629 void *liblustre_services_callback;
 630
 631 void *
 632 liblustre_register_waitidle_callback (cfs_list_t *callback_list,
 633                                       const char *name,
 634                                       int (*fn)(void *arg), void *arg)
 635 {
 636         struct liblustre_wait_callback *llwc;
 637
 638         OBD_ALLOC(llwc, sizeof(*llwc));
 639         LASSERT (llwc != NULL);
 640
 641         llwc->llwc_name = name;
 642         llwc->llwc_fn = fn;
 643         llwc->llwc_arg = arg;
 644         cfs_list_add_tail(&llwc->llwc_list, callback_list);
 645
 646         return (llwc);
 647 }
 648
 649 void
 650 liblustre_deregister_waitidle_callback (void *opaque)
 651 {
 652         struct liblustre_wait_callback *llwc = opaque;
 653
 654         cfs_list_del(&llwc->llwc_list);
 655         OBD_FREE(llwc, sizeof(*llwc));
 656 }
 657
 658 void *
 659 liblustre_register_wait_callback (const char *name,
 660                                   int (*fn)(void *arg), void *arg)
 661 {
 662         return liblustre_register_waitidle_callback(&liblustre_wait_callbacks,
 663                                                     name, fn, arg);
 664 }
 665
 666 void
 667 liblustre_deregister_wait_callback (void *opaque)
 668 {
 669         liblustre_deregister_waitidle_callback(opaque);
 670 }
 671
 672 void *
 673 liblustre_register_idle_callback (const char *name,
 674                                   int (*fn)(void *arg), void *arg)
 675 {
 676         return liblustre_register_waitidle_callback(&liblustre_idle_callbacks,
 677                                                     name, fn, arg);
 678 }
 679
 680 void
 681 liblustre_deregister_idle_callback (void *opaque)
 682 {
 683         liblustre_deregister_waitidle_callback(opaque);
 684 }
 685
 686 int
 687 liblustre_check_events (int timeout)
 688 {
 689         lnet_event_t ev;
 690         int         rc;
 691         int         i;
 692         ENTRY;
 693
 694         rc = LNetEQPoll(&ptlrpc_eq_h, 1, timeout * 1000, &ev, &i);
 695         if (rc == 0)
 696                 RETURN(0);
 697
 698         LASSERT (rc == -EOVERFLOW || rc == 1);
 699
 700         /* liblustre: no asynch callback so we can't afford to miss any
 701          * events... */
 702         if (rc == -EOVERFLOW) {
 703                 CERROR ("Dropped an event!!!\n");
 704                 abort();
 705         }
 706
 707         ptlrpc_master_callback (&ev);
 708         RETURN(1);
 709 }
 710
 711 int liblustre_waiting = 0;
 712
 713 int
 714 liblustre_wait_event (int timeout)
 715 {
 716         cfs_list_t                     *tmp;
 717         struct liblustre_wait_callback *llwc;
 718         int                             found_something = 0;
 719
 720         /* single threaded recursion check... */
 721         liblustre_waiting = 1;
 722
 723         for (;;) {
 724                 /* Deal with all pending events */
 725                 while (liblustre_check_events(0))
 726                         found_something = 1;
 727
 728                 /* Give all registered callbacks a bite at the cherry */
 729                 cfs_list_for_each(tmp, &liblustre_wait_callbacks) {
 730                         llwc = cfs_list_entry(tmp,
 731                                               struct liblustre_wait_callback,
 732                                               llwc_list);
 733
 734                         if (llwc->llwc_fn(llwc->llwc_arg))
 735                                 found_something = 1;
 736                 }
 737
 738                 if (found_something || timeout == 0)
 739                         break;
 740
 741                 /* Nothing so far, but I'm allowed to block... */
 742                 found_something = liblustre_check_events(timeout);
 743                 if (!found_something)           /* still nothing */
 744                         break;                  /* I timed out */
 745         }
 746
 747         liblustre_waiting = 0;
 748
 749         return found_something;
 750 }
 751
 752 void
 753 liblustre_wait_idle(void)
 754 {
 755         static int recursed = 0;
 756
 757         cfs_list_t                     *tmp;
 758         struct liblustre_wait_callback *llwc;
 759         int                             idle = 0;
 760
 761         LASSERT(!recursed);
 762         recursed = 1;
 763
 764         do {
 765                 liblustre_wait_event(0);
 766
 767                 idle = 1;
 768
 769                 cfs_list_for_each(tmp, &liblustre_idle_callbacks) {
 770                         llwc = cfs_list_entry(tmp,
 771                                               struct liblustre_wait_callback,
 772                                               llwc_list);
 773
 774                         if (!llwc->llwc_fn(llwc->llwc_arg)) {
 775                                 idle = 0;
 776                                 break;
 777                         }
 778                 }
 779
 780         } while (!idle);
 781
 782         recursed = 0;
 783 }
 784
 785 #endif /* __KERNEL__ */
 786
 787 int ptlrpc_init_portals(void)
 788 {
 789         int   rc = ptlrpc_ni_init();
 790
 791         if (rc != 0) {
 792                 CERROR("network initialisation failed\n");
 793                 return -EIO;
 794         }
 795 #ifndef __KERNEL__
 796         liblustre_services_callback =
 797                 liblustre_register_wait_callback("liblustre_check_services",
 798                                                  &liblustre_check_services,
 799                                                  NULL);
 800         cfs_init_completion_module(liblustre_wait_event);
 801 #endif
 802         rc = ptlrpcd_addref();
 803         if (rc == 0)
 804                 return 0;
 805
 806         CERROR("rpcd initialisation failed\n");
 807 #ifndef __KERNEL__
 808         liblustre_deregister_wait_callback(liblustre_services_callback);
 809 #endif
 810         ptlrpc_ni_fini();
 811         return rc;
 812 }
 813
 814 void ptlrpc_exit_portals(void)
 815 {
 816 #ifndef __KERNEL__
 817         liblustre_deregister_wait_callback(liblustre_services_callback);
 818 #endif
 819         ptlrpcd_decref();
 820         ptlrpc_ni_fini();
 821 }