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                 spin_lock(&req->rq_lock);
  77                 req->rq_net_err = 1;
  78                 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         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         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         struct ptlrpc_request   *req;
 182         ENTRY;
 183
 184         LASSERT ((desc->bd_type == BULK_PUT_SINK &&
 185                   ev->type == LNET_EVENT_PUT) ||
 186                  (desc->bd_type == BULK_GET_SOURCE &&
 187                   ev->type == LNET_EVENT_GET) ||
 188                  ev->type == LNET_EVENT_UNLINK);
 189         LASSERT (ev->unlinked);
 190
 191         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 192                 ev->status = -EIO;
 193
 194         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,CFS_FAIL_ONCE))
 195                 ev->status = -EIO;
 196
 197         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 198                "event type %d, status %d, desc %p\n",
 199                ev->type, ev->status, desc);
 200
 201         spin_lock(&desc->bd_lock);
 202         req = desc->bd_req;
 203         LASSERT(desc->bd_network_rw);
 204         desc->bd_network_rw = 0;
 205
 206         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 207                 desc->bd_success = 1;
 208                 desc->bd_nob_transferred = ev->mlength;
 209                 desc->bd_sender = ev->sender;
 210         } else {
 211                 /* start reconnect and resend if network error hit */
 212                 spin_lock(&req->rq_lock);
 213                 req->rq_net_err = 1;
 214                 spin_unlock(&req->rq_lock);
 215         }
 216
 217         /* release the encrypted pages for write */
 218         if (desc->bd_req->rq_bulk_write)
 219                 sptlrpc_enc_pool_put_pages(desc);
 220
 221         /* NB don't unlock till after wakeup; desc can disappear under us
 222          * otherwise */
 223         ptlrpc_client_wake_req(req);
 224
 225         spin_unlock(&desc->bd_lock);
 226         EXIT;
 227 }
 228
 229 /*
 230  * We will have percpt request history list for ptlrpc service in upcoming
 231  * patches because we don't want to be serialized by current per-service
 232  * history operations. So we require history ID can (somehow) show arriving
 233  * order w/o grabbing global lock, and user can sort them in userspace.
 234  *
 235  * This is how we generate history ID for ptlrpc_request:
 236  * ----------------------------------------------------
 237  * |  32 bits  |  16 bits  | (16 - X)bits  |  X bits  |
 238  * ----------------------------------------------------
 239  * |  seconds  | usec / 16 |   sequence    | CPT id   |
 240  * ----------------------------------------------------
 241  *
 242  * it might not be precise but should be good enough.
 243  */
 244
 245 #define REQS_CPT_BITS(svcpt)    ((svcpt)->scp_service->srv_cpt_bits)
 246
 247 #define REQS_SEC_SHIFT          32
 248 #define REQS_USEC_SHIFT         16
 249 #define REQS_SEQ_SHIFT(svcpt)   REQS_CPT_BITS(svcpt)
 250
 251 static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
 252                                    struct ptlrpc_request *req)
 253 {
 254         __u64   sec = req->rq_arrival_time.tv_sec;
 255         __u32   usec = req->rq_arrival_time.tv_usec >> 4; /* usec / 16 */
 256         __u64   new_seq;
 257
 258         /* set sequence ID for request and add it to history list,
 259          * it must be called with hold svcpt::scp_lock */
 260
 261         new_seq = (sec << REQS_SEC_SHIFT) |
 262                   (usec << REQS_USEC_SHIFT) | svcpt->scp_cpt;
 263         if (new_seq > svcpt->scp_hist_seq) {
 264                 /* This handles the initial case of scp_hist_seq == 0 or
 265                  * we just jumped into a new time window */
 266                 svcpt->scp_hist_seq = new_seq;
 267         } else {
 268                 LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT);
 269                 /* NB: increase sequence number in current usec bucket,
 270                  * however, it's possible that we used up all bits for
 271                  * sequence and jumped into the next usec bucket (future time),
 272                  * then we hope there will be less RPCs per bucket at some
 273                  * point, and sequence will catch up again */
 274                 svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
 275                 new_seq = svcpt->scp_hist_seq;
 276         }
 277
 278         req->rq_history_seq = new_seq;
 279
 280         cfs_list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs);
 281 }
 282
 283 /*
 284  * Server's incoming request callback
 285  */
 286 void request_in_callback(lnet_event_t *ev)
 287 {
 288         struct ptlrpc_cb_id               *cbid = ev->md.user_ptr;
 289         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 290         struct ptlrpc_service_part        *svcpt = rqbd->rqbd_svcpt;
 291         struct ptlrpc_service             *service = svcpt->scp_service;
 292         struct ptlrpc_request             *req;
 293         ENTRY;
 294
 295         LASSERT (ev->type == LNET_EVENT_PUT ||
 296                  ev->type == LNET_EVENT_UNLINK);
 297         LASSERT ((char *)ev->md.start >= rqbd->rqbd_buffer);
 298         LASSERT ((char *)ev->md.start + ev->offset + ev->mlength <=
 299                  rqbd->rqbd_buffer + service->srv_buf_size);
 300
 301         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 302                "event type %d, status %d, service %s\n",
 303                ev->type, ev->status, service->srv_name);
 304
 305         if (ev->unlinked) {
 306                 /* If this is the last request message to fit in the
 307                  * request buffer we can use the request object embedded in
 308                  * rqbd.  Note that if we failed to allocate a request,
 309                  * we'd have to re-post the rqbd, which we can't do in this
 310                  * context. */
 311                 req = &rqbd->rqbd_req;
 312                 memset(req, 0, sizeof (*req));
 313         } else {
 314                 LASSERT (ev->type == LNET_EVENT_PUT);
 315                 if (ev->status != 0) {
 316                         /* We moaned above already... */
 317                         return;
 318                 }
 319                 OBD_ALLOC_GFP(req, sizeof(*req), CFS_ALLOC_ATOMIC_TRY);
 320                 if (req == NULL) {
 321                         CERROR("Can't allocate incoming request descriptor: "
 322                                "Dropping %s RPC from %s\n",
 323                                service->srv_name,
 324                                libcfs_id2str(ev->initiator));
 325                         return;
 326                 }
 327         }
 328
 329         /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
 330          * flags are reset and scalars are zero.  We only set the message
 331          * size to non-zero if this was a successful receive. */
 332         req->rq_xid = ev->match_bits;
 333         req->rq_reqbuf = ev->md.start + ev->offset;
 334         if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 335                 req->rq_reqdata_len = ev->mlength;
 336         cfs_gettimeofday(&req->rq_arrival_time);
 337         req->rq_peer = ev->initiator;
 338         req->rq_self = ev->target.nid;
 339         req->rq_rqbd = rqbd;
 340         req->rq_phase = RQ_PHASE_NEW;
 341         spin_lock_init(&req->rq_lock);
 342         CFS_INIT_LIST_HEAD(&req->rq_timed_list);
 343         CFS_INIT_LIST_HEAD(&req->rq_exp_list);
 344         cfs_atomic_set(&req->rq_refcount, 1);
 345         if (ev->type == LNET_EVENT_PUT)
 346                 CDEBUG(D_INFO, "incoming req@%p x"LPU64" msgsize %u\n",
 347                        req, req->rq_xid, ev->mlength);
 348
 349         CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
 350
 351         spin_lock(&svcpt->scp_lock);
 352
 353         ptlrpc_req_add_history(svcpt, req);
 354
 355         if (ev->unlinked) {
 356                 svcpt->scp_nrqbds_posted--;
 357                 CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
 358                        svcpt->scp_nrqbds_posted);
 359
 360                 /* Normally, don't complain about 0 buffers posted; LNET won't
 361                  * drop incoming reqs since we set the portal lazy */
 362                 if (test_req_buffer_pressure &&
 363                     ev->type != LNET_EVENT_UNLINK &&
 364                     svcpt->scp_nrqbds_posted == 0)
 365                         CWARN("All %s request buffers busy\n",
 366                               service->srv_name);
 367
 368                 /* req takes over the network's ref on rqbd */
 369         } else {
 370                 /* req takes a ref on rqbd */
 371                 rqbd->rqbd_refcount++;
 372         }
 373
 374         cfs_list_add_tail(&req->rq_list, &svcpt->scp_req_incoming);
 375         svcpt->scp_nreqs_incoming++;
 376
 377         /* NB everything can disappear under us once the request
 378          * has been queued and we unlock, so do the wake now... */
 379         cfs_waitq_signal(&svcpt->scp_waitq);
 380
 381         spin_unlock(&svcpt->scp_lock);
 382         EXIT;
 383 }
 384
 385 /*
 386  *  Server's outgoing reply callback
 387  */
 388 void reply_out_callback(lnet_event_t *ev)
 389 {
 390         struct ptlrpc_cb_id       *cbid = ev->md.user_ptr;
 391         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 392         struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 393         ENTRY;
 394
 395         LASSERT (ev->type == LNET_EVENT_SEND ||
 396                  ev->type == LNET_EVENT_ACK ||
 397                  ev->type == LNET_EVENT_UNLINK);
 398
 399         if (!rs->rs_difficult) {
 400                 /* 'Easy' replies have no further processing so I drop the
 401                  * net's ref on 'rs' */
 402                 LASSERT (ev->unlinked);
 403                 ptlrpc_rs_decref(rs);
 404                 EXIT;
 405                 return;
 406         }
 407
 408         LASSERT (rs->rs_on_net);
 409
 410         if (ev->unlinked) {
 411                 /* Last network callback. The net's ref on 'rs' stays put
 412                  * until ptlrpc_handle_rs() is done with it */
 413                 spin_lock(&svcpt->scp_rep_lock);
 414                 spin_lock(&rs->rs_lock);
 415
 416                 rs->rs_on_net = 0;
 417                 if (!rs->rs_no_ack ||
 418                     rs->rs_transno <=
 419                     rs->rs_export->exp_obd->obd_last_committed)
 420                         ptlrpc_schedule_difficult_reply(rs);
 421
 422                 spin_unlock(&rs->rs_lock);
 423                 spin_unlock(&svcpt->scp_rep_lock);
 424         }
 425         EXIT;
 426 }
 427
 428 #ifdef HAVE_SERVER_SUPPORT
 429 /*
 430  * Server's bulk completion callback
 431  */
 432 void server_bulk_callback (lnet_event_t *ev)
 433 {
 434         struct ptlrpc_cb_id     *cbid = ev->md.user_ptr;
 435         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 436         ENTRY;
 437
 438         LASSERT (ev->type == LNET_EVENT_SEND ||
 439                  ev->type == LNET_EVENT_UNLINK ||
 440                  (desc->bd_type == BULK_PUT_SOURCE &&
 441                   ev->type == LNET_EVENT_ACK) ||
 442                  (desc->bd_type == BULK_GET_SINK &&
 443                   ev->type == LNET_EVENT_REPLY));
 444
 445         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 446                "event type %d, status %d, desc %p\n",
 447                ev->type, ev->status, desc);
 448
 449         spin_lock(&desc->bd_lock);
 450
 451         if ((ev->type == LNET_EVENT_ACK ||
 452              ev->type == LNET_EVENT_REPLY) &&
 453             ev->status == 0) {
 454                 /* We heard back from the peer, so even if we get this
 455                  * before the SENT event (oh yes we can), we know we
 456                  * read/wrote the peer buffer and how much... */
 457                 desc->bd_success = 1;
 458                 desc->bd_nob_transferred = ev->mlength;
 459                 desc->bd_sender = ev->sender;
 460         }
 461
 462         if (ev->unlinked) {
 463                 /* This is the last callback no matter what... */
 464                 desc->bd_network_rw = 0;
 465                 cfs_waitq_signal(&desc->bd_waitq);
 466         }
 467
 468         spin_unlock(&desc->bd_lock);
 469         EXIT;
 470 }
 471 #endif
 472
 473 static void ptlrpc_master_callback(lnet_event_t *ev)
 474 {
 475         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 476         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 477
 478         /* Honestly, it's best to find out early. */
 479         LASSERT (cbid->cbid_arg != LP_POISON);
 480         LASSERT (callback == request_out_callback ||
 481                  callback == reply_in_callback ||
 482                  callback == client_bulk_callback ||
 483                  callback == request_in_callback ||
 484                  callback == reply_out_callback
 485 #ifdef HAVE_SERVER_SUPPORT
 486                  || callback == server_bulk_callback
 487 #endif
 488                  );
 489
 490         callback (ev);
 491 }
 492
 493 int ptlrpc_uuid_to_peer (struct obd_uuid *uuid,
 494                          lnet_process_id_t *peer, lnet_nid_t *self)
 495 {
 496         int               best_dist = 0;
 497         __u32             best_order = 0;
 498         int               count = 0;
 499         int               rc = -ENOENT;
 500         int               portals_compatibility;
 501         int               dist;
 502         __u32             order;
 503         lnet_nid_t        dst_nid;
 504         lnet_nid_t        src_nid;
 505
 506         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 507
 508         peer->pid = LUSTRE_SRV_LNET_PID;
 509
 510         /* Choose the matching UUID that's closest */
 511         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 512                 dist = LNetDist(dst_nid, &src_nid, &order);
 513                 if (dist < 0)
 514                         continue;
 515
 516                 if (dist == 0) {                /* local! use loopback LND */
 517                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 518                         rc = 0;
 519                         break;
 520                 }
 521
 522                 if (rc < 0 ||
 523                     dist < best_dist ||
 524                     (dist == best_dist && order < best_order)) {
 525                         best_dist = dist;
 526                         best_order = order;
 527
 528                         if (portals_compatibility > 1) {
 529                                 /* Strong portals compatibility: Zero the nid's
 530                                  * NET, so if I'm reading new config logs, or
 531                                  * getting configured by (new) lconf I can
 532                                  * still talk to old servers. */
 533                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 534                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 535                         }
 536                         peer->nid = dst_nid;
 537                         *self = src_nid;
 538                         rc = 0;
 539                 }
 540         }
 541
 542         CDEBUG(D_NET,"%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 543         return rc;
 544 }
 545
 546 void ptlrpc_ni_fini(void)
 547 {
 548         cfs_waitq_t         waitq;
 549         struct l_wait_info  lwi;
 550         int                 rc;
 551         int                 retries;
 552
 553         /* Wait for the event queue to become idle since there may still be
 554          * messages in flight with pending events (i.e. the fire-and-forget
 555          * messages == client requests and "non-difficult" server
 556          * replies */
 557
 558         for (retries = 0;; retries++) {
 559                 rc = LNetEQFree(ptlrpc_eq_h);
 560                 switch (rc) {
 561                 default:
 562                         LBUG();
 563
 564                 case 0:
 565                         LNetNIFini();
 566                         return;
 567
 568                 case -EBUSY:
 569                         if (retries != 0)
 570                                 CWARN("Event queue still busy\n");
 571
 572                         /* Wait for a bit */
 573                         cfs_waitq_init(&waitq);
 574                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 575                         l_wait_event(waitq, 0, &lwi);
 576                         break;
 577                 }
 578         }
 579         /* notreached */
 580 }
 581
 582 lnet_pid_t ptl_get_pid(void)
 583 {
 584         lnet_pid_t        pid;
 585
 586 #ifndef  __KERNEL__
 587         pid = getpid();
 588 #else
 589         pid = LUSTRE_SRV_LNET_PID;
 590 #endif
 591         return pid;
 592 }
 593
 594 int ptlrpc_ni_init(void)
 595 {
 596         int              rc;
 597         lnet_pid_t       pid;
 598
 599         pid = ptl_get_pid();
 600         CDEBUG(D_NET, "My pid is: %x\n", pid);
 601
 602         /* We're not passing any limits yet... */
 603         rc = LNetNIInit(pid);
 604         if (rc < 0) {
 605                 CDEBUG (D_NET, "Can't init network interface: %d\n", rc);
 606                 return (-ENOENT);
 607         }
 608
 609         /* CAVEAT EMPTOR: how we process portals events is _radically_
 610          * different depending on... */
 611 #ifdef __KERNEL__
 612         /* kernel LNet calls our master callback when there are new event,
 613          * because we are guaranteed to get every event via callback,
 614          * so we just set EQ size to 0 to avoid overhread of serializing
 615          * enqueue/dequeue operations in LNet. */
 616         rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
 617 #else
 618         /* liblustre calls the master callback when it removes events from the
 619          * event queue.  The event queue has to be big enough not to drop
 620          * anything */
 621         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &ptlrpc_eq_h);
 622 #endif
 623         if (rc == 0)
 624                 return 0;
 625
 626         CERROR ("Failed to allocate event queue: %d\n", rc);
 627         LNetNIFini();
 628
 629         return (-ENOMEM);
 630 }
 631
 632 #ifndef __KERNEL__
 633 CFS_LIST_HEAD(liblustre_wait_callbacks);
 634 CFS_LIST_HEAD(liblustre_idle_callbacks);
 635 void *liblustre_services_callback;
 636
 637 void *
 638 liblustre_register_waitidle_callback (cfs_list_t *callback_list,
 639                                       const char *name,
 640                                       int (*fn)(void *arg), void *arg)
 641 {
 642         struct liblustre_wait_callback *llwc;
 643
 644         OBD_ALLOC(llwc, sizeof(*llwc));
 645         LASSERT (llwc != NULL);
 646
 647         llwc->llwc_name = name;
 648         llwc->llwc_fn = fn;
 649         llwc->llwc_arg = arg;
 650         cfs_list_add_tail(&llwc->llwc_list, callback_list);
 651
 652         return (llwc);
 653 }
 654
 655 void
 656 liblustre_deregister_waitidle_callback (void *opaque)
 657 {
 658         struct liblustre_wait_callback *llwc = opaque;
 659
 660         cfs_list_del(&llwc->llwc_list);
 661         OBD_FREE(llwc, sizeof(*llwc));
 662 }
 663
 664 void *
 665 liblustre_register_wait_callback (const char *name,
 666                                   int (*fn)(void *arg), void *arg)
 667 {
 668         return liblustre_register_waitidle_callback(&liblustre_wait_callbacks,
 669                                                     name, fn, arg);
 670 }
 671
 672 void
 673 liblustre_deregister_wait_callback (void *opaque)
 674 {
 675         liblustre_deregister_waitidle_callback(opaque);
 676 }
 677
 678 void *
 679 liblustre_register_idle_callback (const char *name,
 680                                   int (*fn)(void *arg), void *arg)
 681 {
 682         return liblustre_register_waitidle_callback(&liblustre_idle_callbacks,
 683                                                     name, fn, arg);
 684 }
 685
 686 void
 687 liblustre_deregister_idle_callback (void *opaque)
 688 {
 689         liblustre_deregister_waitidle_callback(opaque);
 690 }
 691
 692 int
 693 liblustre_check_events (int timeout)
 694 {
 695         lnet_event_t ev;
 696         int         rc;
 697         int         i;
 698         ENTRY;
 699
 700         rc = LNetEQPoll(&ptlrpc_eq_h, 1, timeout * 1000, &ev, &i);
 701         if (rc == 0)
 702                 RETURN(0);
 703
 704         LASSERT (rc == -EOVERFLOW || rc == 1);
 705
 706         /* liblustre: no asynch callback so we can't afford to miss any
 707          * events... */
 708         if (rc == -EOVERFLOW) {
 709                 CERROR ("Dropped an event!!!\n");
 710                 abort();
 711         }
 712
 713         ptlrpc_master_callback (&ev);
 714         RETURN(1);
 715 }
 716
 717 int liblustre_waiting = 0;
 718
 719 int
 720 liblustre_wait_event (int timeout)
 721 {
 722         cfs_list_t                     *tmp;
 723         struct liblustre_wait_callback *llwc;
 724         int                             found_something = 0;
 725
 726         /* single threaded recursion check... */
 727         liblustre_waiting = 1;
 728
 729         for (;;) {
 730                 /* Deal with all pending events */
 731                 while (liblustre_check_events(0))
 732                         found_something = 1;
 733
 734                 /* Give all registered callbacks a bite at the cherry */
 735                 cfs_list_for_each(tmp, &liblustre_wait_callbacks) {
 736                         llwc = cfs_list_entry(tmp,
 737                                               struct liblustre_wait_callback,
 738                                               llwc_list);
 739
 740                         if (llwc->llwc_fn(llwc->llwc_arg))
 741                                 found_something = 1;
 742                 }
 743
 744                 if (found_something || timeout == 0)
 745                         break;
 746
 747                 /* Nothing so far, but I'm allowed to block... */
 748                 found_something = liblustre_check_events(timeout);
 749                 if (!found_something)           /* still nothing */
 750                         break;                  /* I timed out */
 751         }
 752
 753         liblustre_waiting = 0;
 754
 755         return found_something;
 756 }
 757
 758 void
 759 liblustre_wait_idle(void)
 760 {
 761         static int recursed = 0;
 762
 763         cfs_list_t                     *tmp;
 764         struct liblustre_wait_callback *llwc;
 765         int                             idle = 0;
 766
 767         LASSERT(!recursed);
 768         recursed = 1;
 769
 770         do {
 771                 liblustre_wait_event(0);
 772
 773                 idle = 1;
 774
 775                 cfs_list_for_each(tmp, &liblustre_idle_callbacks) {
 776                         llwc = cfs_list_entry(tmp,
 777                                               struct liblustre_wait_callback,
 778                                               llwc_list);
 779
 780                         if (!llwc->llwc_fn(llwc->llwc_arg)) {
 781                                 idle = 0;
 782                                 break;
 783                         }
 784                 }
 785
 786         } while (!idle);
 787
 788         recursed = 0;
 789 }
 790
 791 #endif /* __KERNEL__ */
 792
 793 int ptlrpc_init_portals(void)
 794 {
 795         int   rc = ptlrpc_ni_init();
 796
 797         if (rc != 0) {
 798                 CERROR("network initialisation failed\n");
 799                 return -EIO;
 800         }
 801 #ifndef __KERNEL__
 802         liblustre_services_callback =
 803                 liblustre_register_wait_callback("liblustre_check_services",
 804                                                  &liblustre_check_services,
 805                                                  NULL);
 806         init_completion_module(liblustre_wait_event);
 807 #endif
 808         rc = ptlrpcd_addref();
 809         if (rc == 0)
 810                 return 0;
 811
 812         CERROR("rpcd initialisation failed\n");
 813 #ifndef __KERNEL__
 814         liblustre_deregister_wait_callback(liblustre_services_callback);
 815 #endif
 816         ptlrpc_ni_fini();
 817         return rc;
 818 }
 819
 820 void ptlrpc_exit_portals(void)
 821 {
 822 #ifndef __KERNEL__
 823         liblustre_deregister_wait_callback(liblustre_services_callback);
 824 #endif
 825         ptlrpcd_decref();
 826         ptlrpc_ni_fini();
 827 }