kernel/drivers/staging/lustre/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 #include "../../include/linux/libcfs/libcfs.h"
  40 # ifdef __mips64__
  41 #  include <linux/kernel.h>
  42 # endif
  43
  44 #include "../include/obd_class.h"
  45 #include "../include/lustre_net.h"
  46 #include "../include/lustre_sec.h"
  47 #include "ptlrpc_internal.h"
  48
  49 lnet_handle_eq_t   ptlrpc_eq_h;
  50
  51 /*
  52  *  Client's outgoing request callback
  53  */
  54 void request_out_callback(lnet_event_t *ev)
  55 {
  56         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
  57         struct ptlrpc_request *req = cbid->cbid_arg;
  58
  59         LASSERT(ev->type == LNET_EVENT_SEND ||
  60                 ev->type == LNET_EVENT_UNLINK);
  61         LASSERT(ev->unlinked);
  62
  63         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  64
  65         sptlrpc_request_out_callback(req);
  66         spin_lock(&req->rq_lock);
  67         req->rq_real_sent = ktime_get_real_seconds();
  68         if (ev->unlinked)
  69                 req->rq_req_unlink = 0;
  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                 req->rq_net_err = 1;
  77                 ptlrpc_client_wake_req(req);
  78         }
  79         spin_unlock(&req->rq_lock);
  80
  81         ptlrpc_req_finished(req);
  82 }
  83
  84 /*
  85  * Client's incoming reply callback
  86  */
  87 void reply_in_callback(lnet_event_t *ev)
  88 {
  89         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
  90         struct ptlrpc_request *req = cbid->cbid_arg;
  91
  92         DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
  93
  94         LASSERT(ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
  95         LASSERT(ev->md.start == req->rq_repbuf);
  96         LASSERT(ev->offset + ev->mlength <= req->rq_repbuf_len);
  97         /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
  98            for adaptive timeouts' early reply. */
  99         LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
 100
 101         spin_lock(&req->rq_lock);
 102
 103         req->rq_receiving_reply = 0;
 104         req->rq_early = 0;
 105         if (ev->unlinked)
 106                 req->rq_reply_unlink = 0;
 107
 108         if (ev->status)
 109                 goto out_wake;
 110
 111         if (ev->type == LNET_EVENT_UNLINK) {
 112                 LASSERT(ev->unlinked);
 113                 DEBUG_REQ(D_NET, req, "unlink");
 114                 goto out_wake;
 115         }
 116
 117         if (ev->mlength < ev->rlength) {
 118                 CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
 119                        req->rq_replen, ev->rlength, ev->offset);
 120                 req->rq_reply_truncate = 1;
 121                 req->rq_replied = 1;
 122                 req->rq_status = -EOVERFLOW;
 123                 req->rq_nob_received = ev->rlength + ev->offset;
 124                 goto out_wake;
 125         }
 126
 127         if ((ev->offset == 0) &&
 128             ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
 129                 /* Early reply */
 130                 DEBUG_REQ(D_ADAPTTO, req,
 131                           "Early reply received: mlen=%u offset=%d replen=%d replied=%d unlinked=%d",
 132                           ev->mlength, ev->offset,
 133                           req->rq_replen, req->rq_replied, ev->unlinked);
 134
 135                 req->rq_early_count++; /* number received, client side */
 136
 137                 if (req->rq_replied)   /* already got the real reply */
 138                         goto out_wake;
 139
 140                 req->rq_early = 1;
 141                 req->rq_reply_off = ev->offset;
 142                 req->rq_nob_received = ev->mlength;
 143                 /* And we're still receiving */
 144                 req->rq_receiving_reply = 1;
 145         } else {
 146                 /* Real reply */
 147                 req->rq_rep_swab_mask = 0;
 148                 req->rq_replied = 1;
 149                 /* Got reply, no resend required */
 150                 req->rq_resend = 0;
 151                 req->rq_reply_off = ev->offset;
 152                 req->rq_nob_received = ev->mlength;
 153                 /* LNetMDUnlink can't be called under the LNET_LOCK,
 154                    so we must unlink in ptlrpc_unregister_reply */
 155                 DEBUG_REQ(D_INFO, req,
 156                           "reply in flags=%x mlen=%u offset=%d replen=%d",
 157                           lustre_msg_get_flags(req->rq_reqmsg),
 158                           ev->mlength, ev->offset, req->rq_replen);
 159         }
 160
 161         req->rq_import->imp_last_reply_time = ktime_get_real_seconds();
 162
 163 out_wake:
 164         /* NB don't unlock till after wakeup; req can disappear under us
 165          * since we don't have our own ref */
 166         ptlrpc_client_wake_req(req);
 167         spin_unlock(&req->rq_lock);
 168 }
 169
 170 /*
 171  * Client's bulk has been written/read
 172  */
 173 void client_bulk_callback(lnet_event_t *ev)
 174 {
 175         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 176         struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
 177         struct ptlrpc_request *req;
 178
 179         LASSERT((desc->bd_type == BULK_PUT_SINK &&
 180                  ev->type == LNET_EVENT_PUT) ||
 181                 (desc->bd_type == BULK_GET_SOURCE &&
 182                  ev->type == LNET_EVENT_GET) ||
 183                 ev->type == LNET_EVENT_UNLINK);
 184         LASSERT(ev->unlinked);
 185
 186         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
 187                 ev->status = -EIO;
 188
 189         if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,
 190                                  CFS_FAIL_ONCE))
 191                 ev->status = -EIO;
 192
 193         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 194                "event type %d, status %d, desc %p\n",
 195                ev->type, ev->status, desc);
 196
 197         spin_lock(&desc->bd_lock);
 198         req = desc->bd_req;
 199         LASSERT(desc->bd_md_count > 0);
 200         desc->bd_md_count--;
 201
 202         if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
 203                 desc->bd_nob_transferred += ev->mlength;
 204                 desc->bd_sender = ev->sender;
 205         } else {
 206                 /* start reconnect and resend if network error hit */
 207                 spin_lock(&req->rq_lock);
 208                 req->rq_net_err = 1;
 209                 spin_unlock(&req->rq_lock);
 210         }
 211
 212         if (ev->status != 0)
 213                 desc->bd_failure = 1;
 214
 215         /* NB don't unlock till after wakeup; desc can disappear under us
 216          * otherwise */
 217         if (desc->bd_md_count == 0)
 218                 ptlrpc_client_wake_req(desc->bd_req);
 219
 220         spin_unlock(&desc->bd_lock);
 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_nsec / NSEC_PER_USEC / 16; /* 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) |
 257                   (svcpt->scp_cpt < 0 ? 0 : svcpt->scp_cpt);
 258
 259         if (new_seq > svcpt->scp_hist_seq) {
 260                 /* This handles the initial case of scp_hist_seq == 0 or
 261                  * we just jumped into a new time window */
 262                 svcpt->scp_hist_seq = new_seq;
 263         } else {
 264                 LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT);
 265                 /* NB: increase sequence number in current usec bucket,
 266                  * however, it's possible that we used up all bits for
 267                  * sequence and jumped into the next usec bucket (future time),
 268                  * then we hope there will be less RPCs per bucket at some
 269                  * point, and sequence will catch up again */
 270                 svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
 271                 new_seq = svcpt->scp_hist_seq;
 272         }
 273
 274         req->rq_history_seq = new_seq;
 275
 276         list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs);
 277 }
 278
 279 /*
 280  * Server's incoming request callback
 281  */
 282 void request_in_callback(lnet_event_t *ev)
 283 {
 284         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 285         struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
 286         struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
 287         struct ptlrpc_service *service = svcpt->scp_service;
 288         struct ptlrpc_request *req;
 289
 290         LASSERT(ev->type == LNET_EVENT_PUT ||
 291                 ev->type == LNET_EVENT_UNLINK);
 292         LASSERT((char *)ev->md.start >= rqbd->rqbd_buffer);
 293         LASSERT((char *)ev->md.start + ev->offset + ev->mlength <=
 294                 rqbd->rqbd_buffer + service->srv_buf_size);
 295
 296         CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
 297                "event type %d, status %d, service %s\n",
 298                ev->type, ev->status, service->srv_name);
 299
 300         if (ev->unlinked) {
 301                 /* If this is the last request message to fit in the
 302                  * request buffer we can use the request object embedded in
 303                  * rqbd.  Note that if we failed to allocate a request,
 304                  * we'd have to re-post the rqbd, which we can't do in this
 305                  * context. */
 306                 req = &rqbd->rqbd_req;
 307                 memset(req, 0, sizeof(*req));
 308         } else {
 309                 LASSERT(ev->type == LNET_EVENT_PUT);
 310                 if (ev->status != 0) {
 311                         /* We moaned above already... */
 312                         return;
 313                 }
 314                 req = ptlrpc_request_cache_alloc(GFP_ATOMIC);
 315                 if (req == NULL) {
 316                         CERROR("Can't allocate incoming request descriptor: 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         ktime_get_real_ts64(&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         spin_lock_init(&req->rq_lock);
 336         INIT_LIST_HEAD(&req->rq_timed_list);
 337         INIT_LIST_HEAD(&req->rq_exp_list);
 338         atomic_set(&req->rq_refcount, 1);
 339         if (ev->type == LNET_EVENT_PUT)
 340                 CDEBUG(D_INFO, "incoming req@%p x%llu 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         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         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         wake_up(&svcpt->scp_waitq);
 374
 375         spin_unlock(&svcpt->scp_lock);
 376 }
 377
 378 /*
 379  *  Server's outgoing reply callback
 380  */
 381 void reply_out_callback(lnet_event_t *ev)
 382 {
 383         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 384         struct ptlrpc_reply_state *rs = cbid->cbid_arg;
 385         struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 386
 387         LASSERT(ev->type == LNET_EVENT_SEND ||
 388                 ev->type == LNET_EVENT_ACK ||
 389                 ev->type == LNET_EVENT_UNLINK);
 390
 391         if (!rs->rs_difficult) {
 392                 /* 'Easy' replies have no further processing so I drop the
 393                  * net's ref on 'rs' */
 394                 LASSERT(ev->unlinked);
 395                 ptlrpc_rs_decref(rs);
 396                 return;
 397         }
 398
 399         LASSERT(rs->rs_on_net);
 400
 401         if (ev->unlinked) {
 402                 /* Last network callback. The net's ref on 'rs' stays put
 403                  * until ptlrpc_handle_rs() is done with it */
 404                 spin_lock(&svcpt->scp_rep_lock);
 405                 spin_lock(&rs->rs_lock);
 406
 407                 rs->rs_on_net = 0;
 408                 if (!rs->rs_no_ack ||
 409                     rs->rs_transno <=
 410                     rs->rs_export->exp_obd->obd_last_committed)
 411                         ptlrpc_schedule_difficult_reply(rs);
 412
 413                 spin_unlock(&rs->rs_lock);
 414                 spin_unlock(&svcpt->scp_rep_lock);
 415         }
 416 }
 417
 418 static void ptlrpc_master_callback(lnet_event_t *ev)
 419 {
 420         struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
 421         void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
 422
 423         /* Honestly, it's best to find out early. */
 424         LASSERT(cbid->cbid_arg != LP_POISON);
 425         LASSERT(callback == request_out_callback ||
 426                 callback == reply_in_callback ||
 427                 callback == client_bulk_callback ||
 428                 callback == request_in_callback ||
 429                 callback == reply_out_callback);
 430
 431         callback(ev);
 432 }
 433
 434 int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
 435                         lnet_process_id_t *peer, lnet_nid_t *self)
 436 {
 437         int best_dist = 0;
 438         __u32 best_order = 0;
 439         int count = 0;
 440         int rc = -ENOENT;
 441         int portals_compatibility;
 442         int dist;
 443         __u32 order;
 444         lnet_nid_t dst_nid;
 445         lnet_nid_t src_nid;
 446
 447         portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
 448
 449         peer->pid = LUSTRE_SRV_LNET_PID;
 450
 451         /* Choose the matching UUID that's closest */
 452         while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
 453                 dist = LNetDist(dst_nid, &src_nid, &order);
 454                 if (dist < 0)
 455                         continue;
 456
 457                 if (dist == 0) {                /* local! use loopback LND */
 458                         peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
 459                         rc = 0;
 460                         break;
 461                 }
 462
 463                 if (rc < 0 ||
 464                     dist < best_dist ||
 465                     (dist == best_dist && order < best_order)) {
 466                         best_dist = dist;
 467                         best_order = order;
 468
 469                         if (portals_compatibility > 1) {
 470                                 /* Strong portals compatibility: Zero the nid's
 471                                  * NET, so if I'm reading new config logs, or
 472                                  * getting configured by (new) lconf I can
 473                                  * still talk to old servers. */
 474                                 dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
 475                                 src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
 476                         }
 477                         peer->nid = dst_nid;
 478                         *self = src_nid;
 479                         rc = 0;
 480                 }
 481         }
 482
 483         CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
 484         return rc;
 485 }
 486
 487 static void ptlrpc_ni_fini(void)
 488 {
 489         wait_queue_head_t waitq;
 490         struct l_wait_info lwi;
 491         int rc;
 492         int retries;
 493
 494         /* Wait for the event queue to become idle since there may still be
 495          * messages in flight with pending events (i.e. the fire-and-forget
 496          * messages == client requests and "non-difficult" server
 497          * replies */
 498
 499         for (retries = 0;; retries++) {
 500                 rc = LNetEQFree(ptlrpc_eq_h);
 501                 switch (rc) {
 502                 default:
 503                         LBUG();
 504
 505                 case 0:
 506                         LNetNIFini();
 507                         return;
 508
 509                 case -EBUSY:
 510                         if (retries != 0)
 511                                 CWARN("Event queue still busy\n");
 512
 513                         /* Wait for a bit */
 514                         init_waitqueue_head(&waitq);
 515                         lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
 516                         l_wait_event(waitq, 0, &lwi);
 517                         break;
 518                 }
 519         }
 520         /* notreached */
 521 }
 522
 523 static lnet_pid_t ptl_get_pid(void)
 524 {
 525         lnet_pid_t pid;
 526
 527         pid = LUSTRE_SRV_LNET_PID;
 528         return pid;
 529 }
 530
 531 static int ptlrpc_ni_init(void)
 532 {
 533         int rc;
 534         lnet_pid_t pid;
 535
 536         pid = ptl_get_pid();
 537         CDEBUG(D_NET, "My pid is: %x\n", pid);
 538
 539         /* We're not passing any limits yet... */
 540         rc = LNetNIInit(pid);
 541         if (rc < 0) {
 542                 CDEBUG(D_NET, "Can't init network interface: %d\n", rc);
 543                 return -ENOENT;
 544         }
 545
 546         /* CAVEAT EMPTOR: how we process portals events is _radically_
 547          * different depending on... */
 548         /* kernel LNet calls our master callback when there are new event,
 549          * because we are guaranteed to get every event via callback,
 550          * so we just set EQ size to 0 to avoid overhead of serializing
 551          * enqueue/dequeue operations in LNet. */
 552         rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
 553         if (rc == 0)
 554                 return 0;
 555
 556         CERROR("Failed to allocate event queue: %d\n", rc);
 557         LNetNIFini();
 558
 559         return -ENOMEM;
 560 }
 561
 562 int ptlrpc_init_portals(void)
 563 {
 564         int rc = ptlrpc_ni_init();
 565
 566         if (rc != 0) {
 567                 CERROR("network initialisation failed\n");
 568                 return -EIO;
 569         }
 570         rc = ptlrpcd_addref();
 571         if (rc == 0)
 572                 return 0;
 573
 574         CERROR("rpcd initialisation failed\n");
 575         ptlrpc_ni_fini();
 576         return rc;
 577 }
 578
 579 void ptlrpc_exit_portals(void)
 580 {
 581         ptlrpcd_decref();
 582         ptlrpc_ni_fini();
 583 }