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  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_RPC
  38
  39 #ifndef __KERNEL__
  40 # include <liblustre.h>
  41 #else
  42 # include <libcfs/libcfs.h>
  43 # ifdef __mips64__
  44 #  include <linux/kernel.h>
  45 # endif
  46 #endif
  47
  48 #include <obd_class.h>
  49 #include <lustre_net.h>
  50 #include <lustre_sec.h>
  51 #include "ptlrpc_internal.h"
  52
  53 lnet_handle_eq_t   ptlrpc_eq_h;
  54
  55 /*
  56  *  Client's outgoing request callback
  57  */
  58 void request_out_callback(lnet_event_t *ev)
  59 {
  60         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  61         struct ptlrpc_request *req = cbid->cbid_arg;
  62         ENTRY;
  63
  64         LASSERT (ev->type == LNET_EVENT_SEND ||
  65                  ev->type == LNET_EVENT_UNLINK);
  66         LASSERT (ev->unlinked);
  67
  68         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  69
  70         sptlrpc_request_out_callback(req);
  71         req->rq_real_sent = cfs_time_current_sec();
  72
  73         if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
  74
  75                 /* Failed send: make it seem like the reply timed out, just
  76                  * like failing sends in client.c does currently...  */
  77
  78                 spin_lock(&req->rq_lock);
  79                 req->rq_net_err = 1;
  80                 spin_unlock(&req->rq_lock);
  81
  82                 ptlrpc_client_wake_req(req);
  83         }
  84
  85         ptlrpc_req_finished(req);
  86
  87         EXIT;
  88 }
  89
  90 /*
  91  * Client's incoming reply callback
  92  */
  93 void reply_in_callback(lnet_event_t *ev)
  94 {
  95         struct ptlrpc_cb_id   *cbid = ev->md.user_ptr;
  96         struct ptlrpc_request *req = cbid->cbid_arg;
  97         ENTRY;
  98
  99         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
 100
 101         LASSERT (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
 102         LASSERT (ev->md.start == req->rq_repbuf);
 103         LASSERT (ev->offset + ev->mlength <= req->rq_repbuf_len);
 104         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
 105            for adaptive timeouts' early reply. */
 106         LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
 107
 108         spin_lock(&req->rq_lock);
 109
 110         req->rq_receiving_reply = 0;
 111         req->rq_early = 0;
 112         if (ev->unlinked)
 113                 req->rq_must_unlink = 0;
 114
 115         if (ev->status)
 116                 goto out_wake;
 117
 118         if (ev->type == LNET_EVENT_UNLINK) {
 119                 LASSERT(ev->unlinked);
 120                 DEBUG_REQ(D_NET, req, "unlink");
 121                 goto out_wake;
 122         }
 123
 124         if (ev->mlength < ev->rlength ) {
 125                 CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
 126                        req->rq_replen, ev->rlength, ev->offset);
 127                 req->rq_reply_truncate = 1;
 128                 req->rq_replied = 1;
 129                 req->rq_status = -EOVERFLOW;
 130                 req->rq_nob_received = ev->rlength + ev->offset;
 131                 goto out_wake;
 132         }
 133
 134         if ((ev->offset == 0) &&
 135             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 136                 /* Early reply */
 137                 DEBUG_REQ(D_ADAPTTO, req,
 138                           "Early reply received: mlen=%u offset=%d replen=%d "
 139                           "replied=%d unlinked=%d", ev->mlength, ev->offset,
 140                           req->rq_replen, req->rq_replied, ev->unlinked);
 141
 142                 req->rq_early_count++; /* number received, client side */
 143
 144                 if (req->rq_replied)   /* already got the real reply */
 145                         goto out_wake;
 146
 147                 req->rq_early = 1;
 148                 req->rq_reply_off = ev->offset;
 149                 req->rq_nob_received = ev->mlength;
 150                 /* And we're still receiving */
 151                 req->rq_receiving_reply = 1;
 152         } else {
 153                 /* Real reply */
 154                 req->rq_rep_swab_mask = 0;
 155                 req->rq_replied = 1;
 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         req->rq_import->imp_last_reply_time = cfs_time_current_sec();
 167
 168 out_wake:
 169         /* NB don't unlock till after wakeup; req can disappear under us
 170          * since we don't have our own ref */
 171         ptlrpc_client_wake_req(req);
 172         spin_unlock(&req->rq_lock);
 173         EXIT;
 174 }
 175
 176 /*
 177  * Client's bulk has been written/read
 178  */
 179 void client_bulk_callback (lnet_event_t *ev)
 180 {
 181         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 182         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 183         struct ptlrpc_request   *req;
 184         ENTRY;
 185
 186         LASSERT ((desc->bd_type == BULK_PUT_SINK &&
 187                   ev->type == LNET_EVENT_PUT) ||
 188                  (desc->bd_type == BULK_GET_SOURCE &&
 189                   ev->type == LNET_EVENT_GET) ||
 190                  ev->type == LNET_EVENT_UNLINK);
 191         LASSERT (ev->unlinked);
 192
 193         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 194                 ev->status = -EIO;
 195
 196         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,CFS_FAIL_ONCE))
 197                 ev->status = -EIO;
 198
 199         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 200                "event type %d, status %d, desc %p\n",
 201                ev->type, ev->status, desc);
 202
 203         spin_lock(&desc->bd_lock);
 204         req = desc->bd_req;
 205         LASSERT(desc->bd_network_rw);
 206         desc->bd_network_rw = 0;
 207
 208         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 209                 desc->bd_success = 1;
 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         /* release the encrypted pages for write */
 220         if (desc->bd_req->rq_bulk_write)
 221                 sptlrpc_enc_pool_put_pages(desc);
 222
 223         /* NB don't unlock till after wakeup; desc can disappear under us
 224          * otherwise */
 225         ptlrpc_client_wake_req(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_usec >> 4; /* 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         cfs_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(lnet_event_t *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                 OBD_ALLOC_GFP(req, sizeof(*req), CFS_ALLOC_ATOMIC_TRY);
 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         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 334          * flags are reset and scalars are zero.  We only set the message
 335          * size to non-zero if this was a successful receive. */
 336         req->rq_xid = ev->match_bits;
 337         req->rq_reqbuf = ev->md.start + ev->offset;
 338         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 339                 req->rq_reqdata_len = ev->mlength;
 340         cfs_gettimeofday(&req->rq_arrival_time);
 341         req->rq_peer = ev->initiator;
 342         req->rq_self = ev->target.nid;
 343         req->rq_rqbd = rqbd;
 344         req->rq_phase = RQ_PHASE_NEW;
 345         spin_lock_init(&req->rq_lock);
 346         CFS_INIT_LIST_HEAD(&req->rq_timed_list);
 347         CFS_INIT_LIST_HEAD(&req->rq_exp_list);
 348         cfs_atomic_set(&req->rq_refcount, 1);
 349         if (ev->type == LNET_EVENT_PUT)
 350                 CDEBUG(D_INFO, "incoming req@%p x"LPU64" msgsize %u\n",
 351                        req, req->rq_xid, ev->mlength);
 352
 353         CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
 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         cfs_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         cfs_waitq_signal(&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(lnet_event_t *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                         ptlrpc_schedule_difficult_reply(rs);
 425
 426                 spin_unlock(&rs->rs_lock);
 427                 spin_unlock(&svcpt->scp_rep_lock);
 428         }
 429         EXIT;
 430 }
 431
 432 #ifdef HAVE_SERVER_SUPPORT
 433 /*
 434  * Server's bulk completion callback
 435  */
 436 void server_bulk_callback (lnet_event_t *ev)
 437 {
 438         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 439         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 440         ENTRY;
 441
 442         LASSERT (ev->type == LNET_EVENT_SEND ||
 443                  ev->type == LNET_EVENT_UNLINK ||
 444                  (desc->bd_type == BULK_PUT_SOURCE &&
 445                   ev->type == LNET_EVENT_ACK) ||
 446                  (desc->bd_type == BULK_GET_SINK &&
 447                   ev->type == LNET_EVENT_REPLY));
 448
 449         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 450                "event type %d, status %d, desc %p\n",
 451                ev->type, ev->status, desc);
 452
 453         spin_lock(&desc->bd_lock);
 454
 455         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_success = 1;
 462                 desc->bd_nob_transferred = ev->mlength;
 463                 desc->bd_sender = ev->sender;
 464         }
 465
 466         if (ev->unlinked) {
 467                 /* This is the last callback no matter what... */
 468                 desc->bd_network_rw = 0;
 469                 cfs_waitq_signal(&desc->bd_waitq);
 470         }
 471
 472         spin_unlock(&desc->bd_lock);
 473         EXIT;
 474 }
 475 #endif
 476
 477 static void ptlrpc_master_callback(lnet_event_t *ev)
 478 {
 479         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 480         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 481
 482         /* Honestly, it's best to find out early. */
 483         LASSERT (cbid->cbid_arg != LP_POISON);
 484         LASSERT (callback == request_out_callback ||
 485                  callback == reply_in_callback ||
 486                  callback == client_bulk_callback ||
 487                  callback == request_in_callback ||
 488                  callback == reply_out_callback
 489 #ifdef HAVE_SERVER_SUPPORT
 490                  || callback == server_bulk_callback
 491 #endif
 492                  );
 493
 494         callback (ev);
 495 }
 496
 497 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 498                          lnet_process_id_t *peer, lnet_nid_t *self)
 499 {
 500         int               best_dist = 0;
 501         __u32             best_order = 0;
 502         int               count = 0;
 503         int               rc = -ENOENT;
 504         int               portals_compatibility;
 505         int               dist;
 506         __u32             order;
 507         lnet_nid_t        dst_nid;
 508         lnet_nid_t        src_nid;
 509
 510         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 511
 512         peer->pid = LUSTRE_SRV_LNET_PID;
 513
 514         /* Choose the matching UUID that's closest */
 515         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 516                 dist = LNetDist(dst_nid, &src_nid, &order);
 517                 if (dist < 0)
 518                         continue;
 519
 520                 if (dist == 0) {                /* local! use loopback LND */
 521                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 522                         rc = 0;
 523                         break;
 524                 }
 525
 526                 if (rc < 0 ||
 527                     dist < best_dist ||
 528                     (dist == best_dist && order < best_order)) {
 529                         best_dist = dist;
 530                         best_order = order;
 531
 532                         if (portals_compatibility > 1) {
 533                                 /* Strong portals compatibility: Zero the nid's
 534                                  * NET, so if I'm reading new config logs, or
 535                                  * getting configured by (new) lconf I can
 536                                  * still talk to old servers. */
 537                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 538                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 539                         }
 540                         peer->nid = dst_nid;
 541                         *self = src_nid;
 542                         rc = 0;
 543                 }
 544         }
 545
 546         CDEBUG(D_NET,"%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 547         return rc;
 548 }
 549
 550 void ptlrpc_ni_fini(void)
 551 {
 552         cfs_waitq_t         waitq;
 553         struct l_wait_info  lwi;
 554         int                 rc;
 555         int                 retries;
 556
 557         /* Wait for the event queue to become idle since there may still be
 558          * messages in flight with pending events (i.e. the fire-and-forget
 559          * messages == client requests and "non-difficult" server
 560          * replies */
 561
 562         for (retries = 0;; retries++) {
 563                 rc = LNetEQFree(ptlrpc_eq_h);
 564                 switch (rc) {
 565                 default:
 566                         LBUG();
 567
 568                 case 0:
 569                         LNetNIFini();
 570                         return;
 571
 572                 case -EBUSY:
 573                         if (retries != 0)
 574                                 CWARN("Event queue still busy\n");
 575
 576                         /* Wait for a bit */
 577                         cfs_waitq_init(&waitq);
 578                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 579                         l_wait_event(waitq, 0, &lwi);
 580                         break;
 581                 }
 582         }
 583         /* notreached */
 584 }
 585
 586 lnet_pid_t ptl_get_pid(void)
 587 {
 588         lnet_pid_t        pid;
 589
 590 #ifndef  __KERNEL__
 591         pid = getpid();
 592 #else
 593         pid = LUSTRE_SRV_LNET_PID;
 594 #endif
 595         return pid;
 596 }
 597
 598 int ptlrpc_ni_init(void)
 599 {
 600         int              rc;
 601         lnet_pid_t       pid;
 602
 603         pid = ptl_get_pid();
 604         CDEBUG(D_NET, "My pid is: %x\n", pid);
 605
 606         /* We're not passing any limits yet... */
 607         rc = LNetNIInit(pid);
 608         if (rc < 0) {
 609                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 610                 return (-ENOENT);
 611         }
 612
 613         /* CAVEAT EMPTOR: how we process portals events is _radically_
 614          * different depending on... */
 615 #ifdef __KERNEL__
 616         /* kernel LNet calls our master callback when there are new event,
 617          * because we are guaranteed to get every event via callback,
 618          * so we just set EQ size to 0 to avoid overhread of serializing
 619          * enqueue/dequeue operations in LNet. */
 620         rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
 621 #else
 622         /* liblustre calls the master callback when it removes events from the
 623          * event queue.  The event queue has to be big enough not to drop
 624          * anything */
 625         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &ptlrpc_eq_h);
 626 #endif
 627         if (rc == 0)
 628                 return 0;
 629
 630         CERROR ("Failed to allocate event queue: %d\n", rc);
 631         LNetNIFini();
 632
 633         return (-ENOMEM);
 634 }
 635
 636 #ifndef __KERNEL__
 637 CFS_LIST_HEAD(liblustre_wait_callbacks);
 638 CFS_LIST_HEAD(liblustre_idle_callbacks);
 639 void *liblustre_services_callback;
 640
 641 void *
 642 liblustre_register_waitidle_callback (cfs_list_t *callback_list,
 643                                       const char *name,
 644                                       int (*fn)(void *arg), void *arg)
 645 {
 646         struct liblustre_wait_callback *llwc;
 647
 648         OBD_ALLOC(llwc, sizeof(*llwc));
 649         LASSERT (llwc != NULL);
 650
 651         llwc->llwc_name = name;
 652         llwc->llwc_fn = fn;
 653         llwc->llwc_arg = arg;
 654         cfs_list_add_tail(&llwc->llwc_list, callback_list);
 655
 656         return (llwc);
 657 }
 658
 659 void
 660 liblustre_deregister_waitidle_callback (void *opaque)
 661 {
 662         struct liblustre_wait_callback *llwc = opaque;
 663
 664         cfs_list_del(&llwc->llwc_list);
 665         OBD_FREE(llwc, sizeof(*llwc));
 666 }
 667
 668 void *
 669 liblustre_register_wait_callback (const char *name,
 670                                   int (*fn)(void *arg), void *arg)
 671 {
 672         return liblustre_register_waitidle_callback(&liblustre_wait_callbacks,
 673                                                     name, fn, arg);
 674 }
 675
 676 void
 677 liblustre_deregister_wait_callback (void *opaque)
 678 {
 679         liblustre_deregister_waitidle_callback(opaque);
 680 }
 681
 682 void *
 683 liblustre_register_idle_callback (const char *name,
 684                                   int (*fn)(void *arg), void *arg)
 685 {
 686         return liblustre_register_waitidle_callback(&liblustre_idle_callbacks,
 687                                                     name, fn, arg);
 688 }
 689
 690 void
 691 liblustre_deregister_idle_callback (void *opaque)
 692 {
 693         liblustre_deregister_waitidle_callback(opaque);
 694 }
 695
 696 int
 697 liblustre_check_events (int timeout)
 698 {
 699         lnet_event_t ev;
 700         int         rc;
 701         int         i;
 702         ENTRY;
 703
 704         rc = LNetEQPoll(&ptlrpc_eq_h, 1, timeout * 1000, &ev, &i);
 705         if (rc == 0)
 706                 RETURN(0);
 707
 708         LASSERT (rc == -EOVERFLOW || rc == 1);
 709
 710         /* liblustre: no asynch callback so we can't afford to miss any
 711          * events... */
 712         if (rc == -EOVERFLOW) {
 713                 CERROR ("Dropped an event!!!\n");
 714                 abort();
 715         }
 716
 717         ptlrpc_master_callback (&ev);
 718         RETURN(1);
 719 }
 720
 721 int liblustre_waiting = 0;
 722
 723 int
 724 liblustre_wait_event (int timeout)
 725 {
 726         cfs_list_t                     *tmp;
 727         struct liblustre_wait_callback *llwc;
 728         int                             found_something = 0;
 729
 730         /* single threaded recursion check... */
 731         liblustre_waiting = 1;
 732
 733         for (;;) {
 734                 /* Deal with all pending events */
 735                 while (liblustre_check_events(0))
 736                         found_something = 1;
 737
 738                 /* Give all registered callbacks a bite at the cherry */
 739                 cfs_list_for_each(tmp, &liblustre_wait_callbacks) {
 740                         llwc = cfs_list_entry(tmp,
 741                                               struct liblustre_wait_callback,
 742                                               llwc_list);
 743
 744                         if (llwc->llwc_fn(llwc->llwc_arg))
 745                                 found_something = 1;
 746                 }
 747
 748                 if (found_something || timeout == 0)
 749                         break;
 750
 751                 /* Nothing so far, but I'm allowed to block... */
 752                 found_something = liblustre_check_events(timeout);
 753                 if (!found_something)           /* still nothing */
 754                         break;                  /* I timed out */
 755         }
 756
 757         liblustre_waiting = 0;
 758
 759         return found_something;
 760 }
 761
 762 void
 763 liblustre_wait_idle(void)
 764 {
 765         static int recursed = 0;
 766
 767         cfs_list_t                     *tmp;
 768         struct liblustre_wait_callback *llwc;
 769         int                             idle = 0;
 770
 771         LASSERT(!recursed);
 772         recursed = 1;
 773
 774         do {
 775                 liblustre_wait_event(0);
 776
 777                 idle = 1;
 778
 779                 cfs_list_for_each(tmp, &liblustre_idle_callbacks) {
 780                         llwc = cfs_list_entry(tmp,
 781                                               struct liblustre_wait_callback,
 782                                               llwc_list);
 783
 784                         if (!llwc->llwc_fn(llwc->llwc_arg)) {
 785                                 idle = 0;
 786                                 break;
 787                         }
 788                 }
 789
 790         } while (!idle);
 791
 792         recursed = 0;
 793 }
 794
 795 #endif /* __KERNEL__ */
 796
 797 int ptlrpc_init_portals(void)
 798 {
 799         int   rc = ptlrpc_ni_init();
 800
 801         if (rc != 0) {
 802                 CERROR("network initialisation failed\n");
 803                 return -EIO;
 804         }
 805 #ifndef __KERNEL__
 806         liblustre_services_callback =
 807                 liblustre_register_wait_callback("liblustre_check_services",
 808                                                  &liblustre_check_services,
 809                                                  NULL);
 810         init_completion_module(liblustre_wait_event);
 811 #endif
 812         rc = ptlrpcd_addref();
 813         if (rc == 0)
 814                 return 0;
 815
 816         CERROR("rpcd initialisation failed\n");
 817 #ifndef __KERNEL__
 818         liblustre_deregister_wait_callback(liblustre_services_callback);
 819 #endif
 820         ptlrpc_ni_fini();
 821         return rc;
 822 }
 823
 824 void ptlrpc_exit_portals(void)
 825 {
 826 #ifndef __KERNEL__
 827         liblustre_deregister_wait_callback(liblustre_services_callback);
 828 #endif
 829         ptlrpcd_decref();
 830         ptlrpc_ni_fini();
 831 }