lustre/ptlrpc/niobuf.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_RPC
  34 #include <libcfs/linux/linux-mem.h>
  35 #include <obd_support.h>
  36 #include <lustre_net.h>
  37 #include <lustre_lib.h>
  38 #include <obd.h>
  39 #include <obd_class.h>
  40 #include "ptlrpc_internal.h"
  41 #include <lnet/lib-lnet.h> /* for CFS_FAIL_PTLRPC_OST_BULK_CB2 */
  42
  43 /**
  44  * Helper function. Sends \a len bytes from \a base at offset \a offset
  45  * over \a conn connection to portal \a portal.
  46  * Returns 0 on success or error code.
  47  */
  48 static int ptl_send_buf(struct lnet_handle_md *mdh, void *base, int len,
  49                         enum lnet_ack_req ack, struct ptlrpc_cb_id *cbid,
  50                         lnet_nid_t self, struct lnet_process_id peer_id,
  51                         int portal, __u64 xid, unsigned int offset,
  52                         struct lnet_handle_md *bulk_cookie)
  53 {
  54         int              rc;
  55         struct lnet_md         md;
  56         ENTRY;
  57
  58         LASSERT (portal != 0);
  59         CDEBUG (D_INFO, "peer_id %s\n", libcfs_id2str(peer_id));
  60         md.start     = base;
  61         md.length    = len;
  62         md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
  63         md.options   = PTLRPC_MD_OPTIONS;
  64         md.user_ptr  = cbid;
  65         md.handler   = ptlrpc_handler;
  66         LNetInvalidateMDHandle(&md.bulk_handle);
  67
  68         if (bulk_cookie) {
  69                 md.bulk_handle = *bulk_cookie;
  70                 md.options |= LNET_MD_BULK_HANDLE;
  71         }
  72
  73         if (unlikely(ack == LNET_ACK_REQ &&
  74                      OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
  75                 /* don't ask for the ack to simulate failing client */
  76                 ack = LNET_NOACK_REQ;
  77         }
  78
  79         rc = LNetMDBind(&md, LNET_UNLINK, mdh);
  80         if (unlikely(rc != 0)) {
  81                 CERROR ("LNetMDBind failed: %d\n", rc);
  82                 LASSERT (rc == -ENOMEM);
  83                 RETURN (-ENOMEM);
  84         }
  85
  86         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
  87                len, portal, xid, offset);
  88
  89         percpu_ref_get(&ptlrpc_pending);
  90
  91         rc = LNetPut(self, *mdh, ack,
  92                      peer_id, portal, xid, offset, 0);
  93         if (unlikely(rc != 0)) {
  94                 int rc2;
  95                 /* We're going to get an UNLINK event when I unlink below,
  96                  * which will complete just like any other failed send, so
  97                  * I fall through and return success here! */
  98                 CERROR("LNetPut(%s, %d, %lld) failed: %d\n",
  99                        libcfs_id2str(peer_id), portal, xid, rc);
 100                 rc2 = LNetMDUnlink(*mdh);
 101                 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
 102         }
 103
 104         RETURN (0);
 105 }
 106
 107 static void mdunlink_iterate_helper(struct lnet_handle_md *bd_mds, int count)
 108 {
 109         int i;
 110
 111         for (i = 0; i < count; i++)
 112                 LNetMDUnlink(bd_mds[i]);
 113 }
 114
 115 #ifdef HAVE_SERVER_SUPPORT
 116 /**
 117  * Prepare bulk descriptor for specified incoming request \a req that
 118  * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
 119  * the bulk to be sent. Used on server-side after request was already
 120  * received.
 121  * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
 122  * error.
 123  */
 124 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
 125                                               unsigned nfrags, unsigned max_brw,
 126                                               unsigned int type,
 127                                               unsigned portal,
 128                                               const struct ptlrpc_bulk_frag_ops
 129                                                 *ops)
 130 {
 131         struct obd_export *exp = req->rq_export;
 132         struct ptlrpc_bulk_desc *desc;
 133
 134         ENTRY;
 135         LASSERT(ptlrpc_is_bulk_op_active(type));
 136
 137         desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
 138         if (desc == NULL)
 139                 RETURN(NULL);
 140
 141         desc->bd_export = class_export_get(exp);
 142         desc->bd_req = req;
 143
 144         desc->bd_cbid.cbid_fn  = server_bulk_callback;
 145         desc->bd_cbid.cbid_arg = desc;
 146
 147         /* NB we don't assign rq_bulk here; server-side requests are
 148          * re-used, and the handler frees the bulk desc explicitly. */
 149
 150         return desc;
 151 }
 152 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
 153
 154 /**
 155  * Starts bulk transfer for descriptor \a desc on the server.
 156  * Returns 0 on success or error code.
 157  */
 158 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
 159 {
 160         struct obd_export        *exp = desc->bd_export;
 161         lnet_nid_t                self_nid;
 162         struct lnet_process_id    peer_id;
 163         int                       rc = 0;
 164         __u64                     mbits;
 165         int                       posted_md;
 166         int                       total_md;
 167         struct lnet_md                 md;
 168         ENTRY;
 169
 170         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
 171                 RETURN(0);
 172
 173         /* NB no locking required until desc is on the network */
 174         LASSERT(desc->bd_md_count == 0);
 175         LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
 176
 177         LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
 178         LASSERT(desc->bd_cbid.cbid_arg == desc);
 179
 180         /*
 181          * Multi-Rail: get the preferred self and peer NIDs from the
 182          * request, so they are based on the route taken by the
 183          * message.
 184          */
 185         self_nid = desc->bd_req->rq_self;
 186         peer_id = desc->bd_req->rq_source;
 187
 188         /* NB total length may be 0 for a read past EOF, so we send 0
 189          * length bulks, since the client expects bulk events.
 190          *
 191          * The client may not need all of the bulk mbits for the RPC. The RPC
 192          * used the mbits of the highest bulk mbits needed, and the server masks
 193          * off high bits to get bulk count for this RPC. LU-1431 */
 194         mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
 195         total_md = desc->bd_req->rq_mbits - mbits + 1;
 196
 197         desc->bd_md_count = total_md;
 198         desc->bd_failure = 0;
 199
 200         md.user_ptr = &desc->bd_cbid;
 201         md.handler = ptlrpc_handler;
 202         md.threshold = 2; /* SENT and ACK/REPLY */
 203
 204         for (posted_md = 0; posted_md < total_md; mbits++) {
 205                 md.options = PTLRPC_MD_OPTIONS;
 206
 207                 /* NB it's assumed that source and sink buffer frags are
 208                  * page-aligned. Otherwise we'd have to send client bulk
 209                  * sizes over and split server buffer accordingly */
 210                 ptlrpc_fill_bulk_md(&md, desc, posted_md);
 211                 rc = LNetMDBind(&md, LNET_UNLINK, &desc->bd_mds[posted_md]);
 212                 if (rc != 0) {
 213                         CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n",
 214                                exp->exp_obd->obd_name, posted_md, rc);
 215                         LASSERT(rc == -ENOMEM);
 216                         if (posted_md == 0) {
 217                                 desc->bd_md_count = 0;
 218                                 RETURN(-ENOMEM);
 219                         }
 220                         break;
 221                 }
 222                 percpu_ref_get(&ptlrpc_pending);
 223
 224                 /* sanity.sh 224c: lets skip last md */
 225                 if (posted_md == desc->bd_md_max_brw - 1)
 226                         OBD_FAIL_CHECK_RESET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3,
 227                                              CFS_FAIL_PTLRPC_OST_BULK_CB2);
 228
 229                 /* Network is about to get at the memory */
 230                 if (ptlrpc_is_bulk_put_source(desc->bd_type))
 231                         rc = LNetPut(self_nid, desc->bd_mds[posted_md],
 232                                      LNET_ACK_REQ, peer_id,
 233                                      desc->bd_portal, mbits, 0, 0);
 234                 else
 235                         rc = LNetGet(self_nid, desc->bd_mds[posted_md],
 236                                      peer_id, desc->bd_portal, mbits, 0, false);
 237
 238                 posted_md++;
 239                 if (rc != 0) {
 240                         CERROR("%s: failed bulk transfer with %s:%u x%llu: "
 241                                "rc = %d\n", exp->exp_obd->obd_name,
 242                                libcfs_id2str(peer_id), desc->bd_portal,
 243                                mbits, rc);
 244                         break;
 245                 }
 246         }
 247
 248         if (rc != 0) {
 249                 /* Can't send, so we unlink the MD bound above.  The UNLINK
 250                  * event this creates will signal completion with failure,
 251                  * so we return SUCCESS here! */
 252                 spin_lock(&desc->bd_lock);
 253                 desc->bd_md_count -= total_md - posted_md;
 254                 spin_unlock(&desc->bd_lock);
 255                 LASSERT(desc->bd_md_count >= 0);
 256
 257                 mdunlink_iterate_helper(desc->bd_mds, posted_md);
 258                 RETURN(0);
 259         }
 260
 261         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
 262                "id %s mbits %#llx-%#llx\n", desc->bd_iov_count,
 263                desc->bd_nob, desc->bd_portal, libcfs_id2str(peer_id),
 264                mbits - posted_md, mbits - 1);
 265
 266         RETURN(0);
 267 }
 268
 269 /**
 270  * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
 271  * serialises with completion callback)
 272  */
 273 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
 274 {
 275         LASSERT(!in_interrupt());           /* might sleep */
 276
 277         if (!ptlrpc_server_bulk_active(desc))   /* completed or */
 278                 return;                         /* never started */
 279
 280         /* We used to poison the pages with 0xab here because we did not want to
 281          * send any meaningful data over the wire for evicted clients (bug 9297)
 282          * However, this is no longer safe now that we use the page cache on the
 283          * OSS (bug 20560) */
 284
 285         /* The unlink ensures the callback happens ASAP and is the last
 286          * one.  If it fails, it must be because completion just happened,
 287          * but we must still wait_event_idle_timeout() in this case, to give
 288          * us a chance to run server_bulk_callback()
 289          */
 290         mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
 291
 292         for (;;) {
 293                 /* Network access will complete in finite time but the HUGE
 294                  * timeout lets us CWARN for visibility of sluggish NALs */
 295                 int seconds = PTLRPC_REQ_LONG_UNLINK;
 296
 297                 while (seconds > 0 &&
 298                        wait_event_idle_timeout(desc->bd_waitq,
 299                                                !ptlrpc_server_bulk_active(desc),
 300                                                cfs_time_seconds(1)) == 0)
 301                         seconds -= 1;
 302                 if (seconds > 0)
 303                         return;
 304
 305                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 306         }
 307 }
 308 #endif /* HAVE_SERVER_SUPPORT */
 309
 310 /**
 311  * Register bulk at the sender for later transfer.
 312  * Returns 0 on success or error code.
 313  */
 314 int ptlrpc_register_bulk(struct ptlrpc_request *req)
 315 {
 316         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 317         struct lnet_process_id peer;
 318         int rc = 0;
 319         int posted_md;
 320         int total_md;
 321         __u64 mbits;
 322         struct lnet_me *me;
 323         struct lnet_md md;
 324         ENTRY;
 325
 326         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
 327                 RETURN(0);
 328
 329         /* NB no locking required until desc is on the network */
 330         LASSERT(desc->bd_nob > 0);
 331         LASSERT(desc->bd_md_count == 0);
 332         LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT);
 333         LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
 334         LASSERT(desc->bd_req != NULL);
 335         LASSERT(ptlrpc_is_bulk_op_passive(desc->bd_type));
 336
 337         /* cleanup the state of the bulk for it will be reused */
 338         if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY)
 339                 desc->bd_nob_transferred = 0;
 340         else if (desc->bd_nob_transferred != 0)
 341                 /* If the network failed after an RPC was sent, this condition
 342                  * could happen.  Rather than assert (was here before), return
 343                  * an EIO error. */
 344                 RETURN(-EIO);
 345
 346         desc->bd_failure = 0;
 347
 348         peer = desc->bd_import->imp_connection->c_peer;
 349
 350         LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
 351         LASSERT(desc->bd_cbid.cbid_arg == desc);
 352
 353         total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
 354         /* rq_mbits is matchbits of the final bulk */
 355         mbits = req->rq_mbits - total_md + 1;
 356
 357         LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK),
 358                  "first mbits = x%llu, last mbits = x%llu\n",
 359                  mbits, req->rq_mbits);
 360         LASSERTF(!(desc->bd_registered &&
 361                    req->rq_send_state != LUSTRE_IMP_REPLAY) ||
 362                  mbits != desc->bd_last_mbits,
 363                  "registered: %d  rq_mbits: %llu bd_last_mbits: %llu\n",
 364                  desc->bd_registered, mbits, desc->bd_last_mbits);
 365
 366         desc->bd_registered = 1;
 367         desc->bd_last_mbits = mbits;
 368         desc->bd_md_count = total_md;
 369         md.user_ptr = &desc->bd_cbid;
 370         md.handler = ptlrpc_handler;
 371         md.threshold = 1;                       /* PUT or GET */
 372
 373         for (posted_md = 0; posted_md < total_md; posted_md++, mbits++) {
 374                 md.options = PTLRPC_MD_OPTIONS |
 375                              (ptlrpc_is_bulk_op_get(desc->bd_type) ?
 376                               LNET_MD_OP_GET : LNET_MD_OP_PUT);
 377                 ptlrpc_fill_bulk_md(&md, desc, posted_md);
 378
 379                 if (posted_md > 0 && posted_md + 1 == total_md &&
 380                     OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) {
 381                         rc = -ENOMEM;
 382                 } else {
 383                         me = LNetMEAttach(desc->bd_portal, peer, mbits, 0,
 384                                   LNET_UNLINK, LNET_INS_AFTER);
 385                         rc = PTR_ERR_OR_ZERO(me);
 386                 }
 387                 if (rc != 0) {
 388                         CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
 389                                desc->bd_import->imp_obd->obd_name, mbits,
 390                                posted_md, rc);
 391                         break;
 392                 }
 393                 percpu_ref_get(&ptlrpc_pending);
 394
 395                 /* About to let the network at it... */
 396                 rc = LNetMDAttach(me, &md, LNET_UNLINK,
 397                                   &desc->bd_mds[posted_md]);
 398                 if (rc != 0) {
 399                         CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
 400                                desc->bd_import->imp_obd->obd_name, mbits,
 401                                posted_md, rc);
 402                         LNetMEUnlink(me);
 403                         break;
 404                 }
 405         }
 406
 407         if (rc != 0) {
 408                 LASSERT(rc == -ENOMEM);
 409                 spin_lock(&desc->bd_lock);
 410                 desc->bd_md_count -= total_md - posted_md;
 411                 spin_unlock(&desc->bd_lock);
 412                 LASSERT(desc->bd_md_count >= 0);
 413                 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
 414                 req->rq_status = -ENOMEM;
 415                 desc->bd_registered = 0;
 416                 RETURN(-ENOMEM);
 417         }
 418
 419         spin_lock(&desc->bd_lock);
 420         /* Holler if peer manages to touch buffers before he knows the mbits */
 421         if (desc->bd_md_count != total_md)
 422                 CWARN("%s: Peer %s touched %d buffers while I registered\n",
 423                       desc->bd_import->imp_obd->obd_name, libcfs_id2str(peer),
 424                       total_md - desc->bd_md_count);
 425         spin_unlock(&desc->bd_lock);
 426
 427         CDEBUG(D_NET, "Setup %u bulk %s buffers: %u pages %u bytes, "
 428                "mbits x%#llx-%#llx, portal %u\n", desc->bd_md_count,
 429                ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
 430                desc->bd_iov_count, desc->bd_nob,
 431                desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
 432
 433         RETURN(0);
 434 }
 435
 436 /**
 437  * Disconnect a bulk desc from the network. Idempotent. Not
 438  * thread-safe (i.e. only interlocks with completion callback).
 439  * Returns 1 on success or 0 if network unregistration failed for whatever
 440  * reason.
 441  */
 442 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
 443 {
 444         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 445         ENTRY;
 446
 447         LASSERT(!in_interrupt());     /* might sleep */
 448
 449         if (desc)
 450                 desc->bd_registered = 0;
 451
 452         /* Let's setup deadline for reply unlink. */
 453         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
 454             async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
 455                 req->rq_bulk_deadline = ktime_get_real_seconds() +
 456                                         PTLRPC_REQ_LONG_UNLINK;
 457
 458         if (ptlrpc_client_bulk_active(req) == 0)        /* completed or */
 459                 RETURN(1);                              /* never registered */
 460
 461         LASSERT(desc->bd_req == req);  /* bd_req NULL until registered */
 462
 463         /* the unlink ensures the callback happens ASAP and is the last
 464          * one.  If it fails, it must be because completion just happened,
 465          * but we must still wait_event_idle_timeout() in this case to give
 466          * us a chance to run client_bulk_callback()
 467          */
 468         mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
 469
 470         if (ptlrpc_client_bulk_active(req) == 0)        /* completed or */
 471                 RETURN(1);                              /* never registered */
 472
 473         /* Move to "Unregistering" phase as bulk was not unlinked yet. */
 474         ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
 475
 476         /* Do not wait for unlink to finish. */
 477         if (async)
 478                 RETURN(0);
 479
 480         for (;;) {
 481                 /* The wq argument is ignored by user-space wait_event macros */
 482                 wait_queue_head_t *wq = (req->rq_set != NULL) ?
 483                                         &req->rq_set->set_waitq :
 484                                         &req->rq_reply_waitq;
 485                 /*
 486                  * Network access will complete in finite time but the HUGE
 487                  * timeout lets us CWARN for visibility of sluggish NALs.
 488                  */
 489                 int seconds = PTLRPC_REQ_LONG_UNLINK;
 490
 491                 while (seconds > 0 &&
 492                        wait_event_idle_timeout(*wq,
 493                                                !ptlrpc_client_bulk_active(req),
 494                                                cfs_time_seconds(1)) == 0)
 495                         seconds -= 1;
 496                 if (seconds > 0) {
 497                         ptlrpc_rqphase_move(req, req->rq_next_phase);
 498                         RETURN(1);
 499                 }
 500
 501                 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
 502                           desc);
 503         }
 504         RETURN(0);
 505 }
 506
 507 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
 508 {
 509         struct ptlrpc_service_part      *svcpt = req->rq_rqbd->rqbd_svcpt;
 510         struct ptlrpc_service           *svc = svcpt->scp_service;
 511         timeout_t service_timeout;
 512
 513         service_timeout = clamp_t(timeout_t, ktime_get_real_seconds() -
 514                                              req->rq_arrival_time.tv_sec, 1,
 515                                   (AT_OFF ? obd_timeout * 3 / 2 : at_max));
 516         if (!(flags & PTLRPC_REPLY_EARLY) &&
 517             (req->rq_type != PTL_RPC_MSG_ERR) &&
 518             (req->rq_reqmsg != NULL) &&
 519             !(lustre_msg_get_flags(req->rq_reqmsg) &
 520               (MSG_RESENT | MSG_REPLAY |
 521                MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
 522                 /* early replies, errors and recovery requests don't count
 523                  * toward our service time estimate
 524                  */
 525                 timeout_t oldse = at_measured(&svcpt->scp_at_estimate,
 526                                               service_timeout);
 527
 528                 if (oldse != 0) {
 529                         DEBUG_REQ(D_ADAPTTO, req,
 530                                   "svc %s changed estimate from %d to %d",
 531                                   svc->srv_name, oldse,
 532                                   at_get(&svcpt->scp_at_estimate));
 533                 }
 534         }
 535         /* Report actual service time for client latency calc */
 536         lustre_msg_set_service_timeout(req->rq_repmsg, service_timeout);
 537         /* Report service time estimate for future client reqs, but report 0
 538          * (to be ignored by client) if it's an error reply during recovery.
 539          * b=15815
 540          */
 541         if (req->rq_type == PTL_RPC_MSG_ERR &&
 542             (req->rq_export == NULL ||
 543              req->rq_export->exp_obd->obd_recovering)) {
 544                 lustre_msg_set_timeout(req->rq_repmsg, 0);
 545         } else {
 546                 timeout_t timeout;
 547
 548                 if (req->rq_export && req->rq_reqmsg != NULL &&
 549                     (flags & PTLRPC_REPLY_EARLY) &&
 550                     lustre_msg_get_flags(req->rq_reqmsg) &
 551                     (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
 552                         struct obd_device *exp_obd = req->rq_export->exp_obd;
 553
 554                         timeout = ktime_get_real_seconds() -
 555                                   req->rq_arrival_time.tv_sec +
 556                                   min_t(timeout_t, at_extra,
 557                                         exp_obd->obd_recovery_timeout / 4);
 558                 } else {
 559                         timeout = at_get(&svcpt->scp_at_estimate);
 560                 }
 561                 lustre_msg_set_timeout(req->rq_repmsg, timeout);
 562         }
 563
 564         if (req->rq_reqmsg &&
 565             !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
 566                 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
 567                        "req_flags=%#x magic=%x/%x len=%d\n",
 568                        flags, lustre_msg_get_flags(req->rq_reqmsg),
 569                        lustre_msg_get_magic(req->rq_reqmsg),
 570                        lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
 571         }
 572 }
 573
 574 /**
 575  * Send request reply from request \a req reply buffer.
 576  * \a flags defines reply types
 577  * Returns 0 on success or error code
 578  */
 579 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
 580 {
 581         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 582         struct ptlrpc_connection  *conn;
 583         int                        rc;
 584
 585         /* We must already have a reply buffer (only ptlrpc_error() may be
 586          * called without one). The reply generated by sptlrpc layer (e.g.
 587          * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
 588          * have a request buffer which is either the actual (swabbed) incoming
 589          * request, or a saved copy if this is a req saved in
 590          * target_queue_final_reply().
 591          */
 592         LASSERT (req->rq_no_reply == 0);
 593         LASSERT (req->rq_reqbuf != NULL);
 594         LASSERT (rs != NULL);
 595         LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
 596         LASSERT (req->rq_repmsg != NULL);
 597         LASSERT (req->rq_repmsg == rs->rs_msg);
 598         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
 599         LASSERT (rs->rs_cb_id.cbid_arg == rs);
 600
 601         /* There may be no rq_export during failover */
 602
 603         if (unlikely(req->rq_export && req->rq_export->exp_obd &&
 604                      req->rq_export->exp_obd->obd_fail)) {
 605                 /* Failed obd's only send ENODEV */
 606                 req->rq_type = PTL_RPC_MSG_ERR;
 607                 req->rq_status = -ENODEV;
 608                 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
 609                        req->rq_export->exp_obd->obd_minor);
 610         }
 611
 612         if (req->rq_type != PTL_RPC_MSG_ERR)
 613                 req->rq_type = PTL_RPC_MSG_REPLY;
 614
 615         lustre_msg_set_type(req->rq_repmsg, req->rq_type);
 616         lustre_msg_set_status(req->rq_repmsg,
 617                               ptlrpc_status_hton(req->rq_status));
 618         lustre_msg_set_opc(req->rq_repmsg,
 619                 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
 620
 621         target_pack_pool_reply(req);
 622
 623         ptlrpc_at_set_reply(req, flags);
 624
 625         if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
 626                 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
 627         else
 628                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
 629
 630         if (unlikely(conn == NULL)) {
 631                 CERROR("not replying on NULL connection\n"); /* bug 9635 */
 632                 return -ENOTCONN;
 633         }
 634         ptlrpc_rs_addref(rs);                   /* +1 ref for the network */
 635
 636         rc = sptlrpc_svc_wrap_reply(req);
 637         if (unlikely(rc))
 638                 goto out;
 639
 640         req->rq_sent = ktime_get_real_seconds();
 641
 642         rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
 643                           (rs->rs_difficult && !rs->rs_no_ack) ?
 644                           LNET_ACK_REQ : LNET_NOACK_REQ,
 645                           &rs->rs_cb_id, req->rq_self, req->rq_source,
 646                           ptlrpc_req2svc(req)->srv_rep_portal,
 647                           req->rq_xid, req->rq_reply_off, NULL);
 648 out:
 649         if (unlikely(rc != 0))
 650                 ptlrpc_req_drop_rs(req);
 651         ptlrpc_connection_put(conn);
 652         return rc;
 653 }
 654
 655 int ptlrpc_reply (struct ptlrpc_request *req)
 656 {
 657         if (req->rq_no_reply)
 658                 return 0;
 659         else
 660                 return (ptlrpc_send_reply(req, 0));
 661 }
 662
 663 /**
 664  * For request \a req send an error reply back. Create empty
 665  * reply buffers if necessary.
 666  */
 667 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
 668 {
 669         int rc;
 670         ENTRY;
 671
 672         if (req->rq_no_reply)
 673                 RETURN(0);
 674
 675         if (!req->rq_repmsg) {
 676                 rc = lustre_pack_reply(req, 1, NULL, NULL);
 677                 if (rc)
 678                         RETURN(rc);
 679         }
 680
 681         if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
 682             req->rq_status != -EPERM && req->rq_status != -ENOENT &&
 683             req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
 684                 req->rq_type = PTL_RPC_MSG_ERR;
 685
 686         rc = ptlrpc_send_reply(req, may_be_difficult);
 687         RETURN(rc);
 688 }
 689
 690 int ptlrpc_error(struct ptlrpc_request *req)
 691 {
 692         return ptlrpc_send_error(req, 0);
 693 }
 694
 695 /**
 696  * Send request \a request.
 697  * if \a noreply is set, don't expect any reply back and don't set up
 698  * reply buffers.
 699  * Returns 0 on success or error code.
 700  */
 701 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
 702 {
 703         int rc;
 704         int mpflag = 0;
 705         struct lnet_handle_md bulk_cookie;
 706         struct ptlrpc_connection *connection;
 707         struct lnet_me *reply_me = NULL;
 708         struct lnet_md reply_md;
 709         struct obd_import *imp = request->rq_import;
 710         struct obd_device *obd = imp->imp_obd;
 711         ENTRY;
 712
 713         LNetInvalidateMDHandle(&bulk_cookie);
 714
 715         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
 716                 RETURN(0);
 717
 718         LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
 719         LASSERT(request->rq_wait_ctx == 0);
 720
 721         /* If this is a re-transmit, we're required to have disengaged
 722          * cleanly from the previous attempt */
 723         LASSERT(!request->rq_receiving_reply);
 724         LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
 725                 (imp->imp_state == LUSTRE_IMP_FULL)));
 726
 727         if (unlikely(obd != NULL && obd->obd_fail)) {
 728                 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
 729                         obd->obd_name);
 730                 /* this prevents us from waiting in ptlrpc_queue_wait */
 731                 spin_lock(&request->rq_lock);
 732                 request->rq_err = 1;
 733                 spin_unlock(&request->rq_lock);
 734                 request->rq_status = -ENODEV;
 735                 RETURN(-ENODEV);
 736         }
 737
 738         connection = imp->imp_connection;
 739
 740         lustre_msg_set_handle(request->rq_reqmsg,
 741                               &imp->imp_remote_handle);
 742         lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
 743         lustre_msg_set_conn_cnt(request->rq_reqmsg,
 744                                 imp->imp_conn_cnt);
 745         lustre_msghdr_set_flags(request->rq_reqmsg,
 746                                 imp->imp_msghdr_flags);
 747
 748         /* If it's the first time to resend the request for EINPROGRESS,
 749          * we need to allocate a new XID (see after_reply()), it's different
 750          * from the resend for reply timeout. */
 751         if (request->rq_nr_resend != 0 &&
 752             list_empty(&request->rq_unreplied_list)) {
 753                 __u64 min_xid = 0;
 754                 /* resend for EINPROGRESS, allocate new xid to avoid reply
 755                  * reconstruction */
 756                 spin_lock(&imp->imp_lock);
 757                 ptlrpc_assign_next_xid_nolock(request);
 758                 min_xid = ptlrpc_known_replied_xid(imp);
 759                 spin_unlock(&imp->imp_lock);
 760
 761                 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
 762                 DEBUG_REQ(D_RPCTRACE, request,
 763                           "Allocating new XID for resend on EINPROGRESS");
 764         }
 765
 766         if (request->rq_bulk != NULL) {
 767                 ptlrpc_set_bulk_mbits(request);
 768                 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
 769         }
 770
 771         if (list_empty(&request->rq_unreplied_list) ||
 772             request->rq_xid <= imp->imp_known_replied_xid) {
 773                 DEBUG_REQ(D_ERROR, request,
 774                           "xid=%llu, replied=%llu, list_empty=%d",
 775                           request->rq_xid, imp->imp_known_replied_xid,
 776                           list_empty(&request->rq_unreplied_list));
 777                 LBUG();
 778         }
 779
 780         /** For enabled AT all request should have AT_SUPPORT in the
 781          * FULL import state when OBD_CONNECT_AT is set */
 782         LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
 783                 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
 784                 !(imp->imp_connect_data.ocd_connect_flags &
 785                 OBD_CONNECT_AT));
 786
 787         if (request->rq_resend) {
 788                 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
 789                 if (request->rq_resend_cb != NULL)
 790                         request->rq_resend_cb(request, &request->rq_async_args);
 791         }
 792         if (request->rq_memalloc)
 793                 mpflag = memalloc_noreclaim_save();
 794
 795         rc = sptlrpc_cli_wrap_request(request);
 796         if (rc)
 797                 GOTO(out, rc);
 798
 799         /* bulk register should be done after wrap_request() */
 800         if (request->rq_bulk != NULL) {
 801                 rc = ptlrpc_register_bulk (request);
 802                 if (rc != 0)
 803                         GOTO(cleanup_bulk, rc);
 804                 /*
 805                  * All the mds in the request will have the same cpt
 806                  * encoded in the cookie. So we can just get the first
 807                  * one.
 808                  */
 809                 bulk_cookie = request->rq_bulk->bd_mds[0];
 810         }
 811
 812         if (!noreply) {
 813                 LASSERT (request->rq_replen != 0);
 814                 if (request->rq_repbuf == NULL) {
 815                         LASSERT(request->rq_repdata == NULL);
 816                         LASSERT(request->rq_repmsg == NULL);
 817                         rc = sptlrpc_cli_alloc_repbuf(request,
 818                                                       request->rq_replen);
 819                         if (rc) {
 820                                 /* this prevents us from looping in
 821                                  * ptlrpc_queue_wait */
 822                                 spin_lock(&request->rq_lock);
 823                                 request->rq_err = 1;
 824                                 spin_unlock(&request->rq_lock);
 825                                 request->rq_status = rc;
 826                                 GOTO(cleanup_bulk, rc);
 827                         }
 828                 } else {
 829                         request->rq_repdata = NULL;
 830                         request->rq_repmsg = NULL;
 831                 }
 832
 833                 if (request->rq_bulk &&
 834                     OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_REPLY_ATTACH)) {
 835                         reply_me = ERR_PTR(-ENOMEM);
 836                 } else {
 837                         reply_me = LNetMEAttach(request->rq_reply_portal,
 838                                                 connection->c_peer,
 839                                                 request->rq_xid, 0,
 840                                                 LNET_UNLINK, LNET_INS_AFTER);
 841                 }
 842
 843                 if (IS_ERR(reply_me)) {
 844                         rc = PTR_ERR(reply_me);
 845                         CERROR("LNetMEAttach failed: %d\n", rc);
 846                         LASSERT(rc == -ENOMEM);
 847                         GOTO(cleanup_bulk, rc = -ENOMEM);
 848                 }
 849         }
 850
 851         spin_lock(&request->rq_lock);
 852         /* We are responsible for unlinking the reply buffer */
 853         request->rq_reply_unlinked = noreply;
 854         request->rq_receiving_reply = !noreply;
 855         /* Clear any flags that may be present from previous sends. */
 856         request->rq_req_unlinked = 0;
 857         request->rq_replied = 0;
 858         request->rq_err = 0;
 859         request->rq_timedout = 0;
 860         request->rq_net_err = 0;
 861         request->rq_resend = 0;
 862         request->rq_restart = 0;
 863         request->rq_reply_truncated = 0;
 864         spin_unlock(&request->rq_lock);
 865
 866         if (!noreply) {
 867                 reply_md.start     = request->rq_repbuf;
 868                 reply_md.length    = request->rq_repbuf_len;
 869                 /* Allow multiple early replies */
 870                 reply_md.threshold = LNET_MD_THRESH_INF;
 871                 /* Manage remote for early replies */
 872                 reply_md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
 873                         LNET_MD_MANAGE_REMOTE |
 874                         LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
 875                 reply_md.user_ptr  = &request->rq_reply_cbid;
 876                 reply_md.handler = ptlrpc_handler;
 877
 878                 /* We must see the unlink callback to set rq_reply_unlinked,
 879                  * so we can't auto-unlink */
 880                 rc = LNetMDAttach(reply_me, &reply_md, LNET_RETAIN,
 881                                   &request->rq_reply_md_h);
 882                 if (rc != 0) {
 883                         CERROR("LNetMDAttach failed: %d\n", rc);
 884                         LASSERT(rc == -ENOMEM);
 885                         spin_lock(&request->rq_lock);
 886                         /* ...but the MD attach didn't succeed... */
 887                         request->rq_receiving_reply = 0;
 888                         spin_unlock(&request->rq_lock);
 889                         GOTO(cleanup_me, rc = -ENOMEM);
 890                 }
 891                 percpu_ref_get(&ptlrpc_pending);
 892
 893                 CDEBUG(D_NET,
 894                        "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
 895                        request->rq_repbuf_len, request->rq_xid,
 896                        request->rq_reply_portal);
 897         }
 898
 899         /* add references on request for request_out_callback */
 900         ptlrpc_request_addref(request);
 901         if (obd != NULL && obd->obd_svc_stats != NULL)
 902                 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
 903                         atomic_read(&imp->imp_inflight));
 904
 905         OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
 906
 907         request->rq_sent_ns = ktime_get_real();
 908         request->rq_sent = ktime_get_real_seconds();
 909         /* We give the server rq_timeout secs to process the req, and
 910            add the network latency for our local timeout. */
 911         request->rq_deadline = request->rq_sent + request->rq_timeout +
 912                 ptlrpc_at_get_net_latency(request);
 913
 914         ptlrpc_pinger_sending_on_import(imp);
 915
 916         DEBUG_REQ(D_INFO, request, "send flags=%x",
 917                   lustre_msg_get_flags(request->rq_reqmsg));
 918         rc = ptl_send_buf(&request->rq_req_md_h,
 919                           request->rq_reqbuf, request->rq_reqdata_len,
 920                           LNET_NOACK_REQ, &request->rq_req_cbid,
 921                           LNET_NID_ANY, connection->c_peer,
 922                           request->rq_request_portal,
 923                           request->rq_xid, 0, &bulk_cookie);
 924         if (likely(rc == 0))
 925                 GOTO(out, rc);
 926
 927         request->rq_req_unlinked = 1;
 928         ptlrpc_req_finished(request);
 929         if (noreply)
 930                 GOTO(out, rc);
 931
 932  cleanup_me:
 933         /* MEUnlink is safe; the PUT didn't even get off the ground, and
 934          * nobody apart from the PUT's target has the right nid+XID to
 935          * access the reply buffer.
 936          */
 937         LNetMEUnlink(reply_me);
 938         /* UNLINKED callback called synchronously */
 939         LASSERT(!request->rq_receiving_reply);
 940
 941  cleanup_bulk:
 942         /* We do sync unlink here as there was no real transfer here so
 943          * the chance to have long unlink to sluggish net is smaller here. */
 944         ptlrpc_unregister_bulk(request, 0);
 945  out:
 946         if (rc == -ENOMEM) {
 947                 /* set rq_sent so that this request is treated
 948                  * as a delayed send in the upper layers */
 949                 request->rq_sent = ktime_get_real_seconds();
 950         }
 951
 952         if (request->rq_memalloc)
 953                 memalloc_noreclaim_restore(mpflag);
 954
 955         return rc;
 956 }
 957 EXPORT_SYMBOL(ptl_send_rpc);
 958
 959 /**
 960  * Register request buffer descriptor for request receiving.
 961  */
 962 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
 963 {
 964         struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
 965         static struct lnet_process_id match_id = {
 966                 .nid = LNET_NID_ANY,
 967                 .pid = LNET_PID_ANY
 968         };
 969         int rc;
 970         struct lnet_md md;
 971         struct lnet_me *me;
 972
 973         CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
 974                service->srv_req_portal);
 975
 976         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
 977                 return (-ENOMEM);
 978
 979         /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
 980          * which means buffer can only be attached on local CPT, and LND
 981          * threads can find it by grabbing a local lock */
 982         me = LNetMEAttach(service->srv_req_portal,
 983                           match_id, 0, ~0, LNET_UNLINK,
 984                           rqbd->rqbd_svcpt->scp_cpt >= 0 ?
 985                           LNET_INS_LOCAL : LNET_INS_AFTER);
 986         if (IS_ERR(me)) {
 987                 CERROR("LNetMEAttach failed: %ld\n", PTR_ERR(me));
 988                 return -ENOMEM;
 989         }
 990
 991         LASSERT(rqbd->rqbd_refcount == 0);
 992         rqbd->rqbd_refcount = 1;
 993
 994         md.start     = rqbd->rqbd_buffer;
 995         md.length    = service->srv_buf_size;
 996         md.max_size  = service->srv_max_req_size;
 997         md.threshold = LNET_MD_THRESH_INF;
 998         md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
 999         md.user_ptr  = &rqbd->rqbd_cbid;
1000         md.handler   = ptlrpc_handler;
1001
1002         rc = LNetMDAttach(me, &md, LNET_UNLINK, &rqbd->rqbd_md_h);
1003         if (rc == 0) {
1004                 percpu_ref_get(&ptlrpc_pending);
1005                 return 0;
1006         }
1007
1008         CERROR("ptlrpc: LNetMDAttach failed: rc = %d\n", rc);
1009         LASSERT(rc == -ENOMEM);
1010         LNetMEUnlink(me);
1011         LASSERT(rc == 0);
1012         rqbd->rqbd_refcount = 0;
1013
1014         return -ENOMEM;
1015 }