lustre/ptlrpc/niobuf.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of the Lustre file system, http://www.lustre.org
   7  *   Lustre is a trademark of Cluster File Systems, Inc.
   8  *
   9  *   You may have signed or agreed to another license before downloading
  10  *   this software.  If so, you are bound by the terms and conditions
  11  *   of that agreement, and the following does not apply to you.  See the
  12  *   LICENSE file included with this distribution for more information.
  13  *
  14  *   If you did not agree to a different license, then this copy of Lustre
  15  *   is open source software; you can redistribute it and/or modify it
  16  *   under the terms of version 2 of the GNU General Public License as
  17  *   published by the Free Software Foundation.
  18  *
  19  *   In either case, Lustre is distributed in the hope that it will be
  20  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  21  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   license text for more details.
  23  *
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_RPC
  27 #ifndef __KERNEL__
  28 #include <liblustre.h>
  29 #endif
  30 #include <obd_support.h>
  31 #include <lustre_net.h>
  32 #include <lustre_lib.h>
  33 #include <obd.h>
  34 #include "ptlrpc_internal.h"
  35
  36 static int ptl_send_buf (lnet_handle_md_t *mdh, void *base, int len,
  37                          lnet_ack_req_t ack, struct ptlrpc_cb_id *cbid,
  38                          struct ptlrpc_connection *conn, int portal, __u64 xid,
  39                          unsigned int offset)
  40 {
  41         int              rc;
  42         lnet_md_t         md;
  43         ENTRY;
  44
  45         LASSERT (portal != 0);
  46         LASSERT (conn != NULL);
  47         CDEBUG (D_INFO, "conn=%p id %s\n", conn, libcfs_id2str(conn->c_peer));
  48         md.start     = base;
  49         md.length    = len;
  50         md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
  51         md.options   = PTLRPC_MD_OPTIONS;
  52         md.user_ptr  = cbid;
  53         md.eq_handle = ptlrpc_eq_h;
  54
  55         if (unlikely(ack == LNET_ACK_REQ &&
  56                      OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
  57                 /* don't ask for the ack to simulate failing client */
  58                 ack = LNET_NOACK_REQ;
  59         }
  60
  61         rc = LNetMDBind (md, LNET_UNLINK, mdh);
  62         if (unlikely(rc != 0)) {
  63                 CERROR ("LNetMDBind failed: %d\n", rc);
  64                 LASSERT (rc == -ENOMEM);
  65                 RETURN (-ENOMEM);
  66         }
  67
  68         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid "LPD64", offset %u\n",
  69                len, portal, xid, offset);
  70
  71         rc = LNetPut (conn->c_self, *mdh, ack,
  72                       conn->c_peer, portal, xid, offset, 0);
  73         if (unlikely(rc != 0)) {
  74                 int rc2;
  75                 /* We're going to get an UNLINK event when I unlink below,
  76                  * which will complete just like any other failed send, so
  77                  * I fall through and return success here! */
  78                 CERROR("LNetPut(%s, %d, "LPD64") failed: %d\n",
  79                        libcfs_id2str(conn->c_peer), portal, xid, rc);
  80                 rc2 = LNetMDUnlink(*mdh);
  81                 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
  82         }
  83
  84         RETURN (0);
  85 }
  86
  87 int ptlrpc_start_bulk_transfer (struct ptlrpc_bulk_desc *desc)
  88 {
  89         struct ptlrpc_connection *conn = desc->bd_export->exp_connection;
  90         int                       rc;
  91         int                       rc2;
  92         lnet_md_t                 md;
  93         __u64                     xid;
  94         ENTRY;
  95
  96         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
  97                 RETURN(0);
  98
  99         /* NB no locking required until desc is on the network */
 100         LASSERT (!desc->bd_network_rw);
 101         LASSERT (desc->bd_type == BULK_PUT_SOURCE ||
 102                  desc->bd_type == BULK_GET_SINK);
 103         desc->bd_success = 0;
 104
 105         md.user_ptr = &desc->bd_cbid;
 106         md.eq_handle = ptlrpc_eq_h;
 107         md.threshold = 2; /* SENT and ACK/REPLY */
 108         md.options = PTLRPC_MD_OPTIONS;
 109         ptlrpc_fill_bulk_md(&md, desc);
 110
 111         LASSERT (desc->bd_cbid.cbid_fn == server_bulk_callback);
 112         LASSERT (desc->bd_cbid.cbid_arg == desc);
 113
 114         /* NB total length may be 0 for a read past EOF, so we send a 0
 115          * length bulk, since the client expects a bulk event. */
 116
 117         rc = LNetMDBind(md, LNET_UNLINK, &desc->bd_md_h);
 118         if (rc != 0) {
 119                 CERROR("LNetMDBind failed: %d\n", rc);
 120                 LASSERT (rc == -ENOMEM);
 121                 RETURN(-ENOMEM);
 122         }
 123
 124         /* Client's bulk and reply matchbits are the same */
 125         xid = desc->bd_req->rq_xid;
 126         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
 127                "id %s xid "LPX64"\n", desc->bd_iov_count,
 128                desc->bd_nob, desc->bd_portal,
 129                libcfs_id2str(conn->c_peer), xid);
 130
 131         /* Network is about to get at the memory */
 132         desc->bd_network_rw = 1;
 133
 134         if (desc->bd_type == BULK_PUT_SOURCE)
 135                 rc = LNetPut (conn->c_self, desc->bd_md_h, LNET_ACK_REQ,
 136                               conn->c_peer, desc->bd_portal, xid, 0, 0);
 137         else
 138                 rc = LNetGet (conn->c_self, desc->bd_md_h,
 139                               conn->c_peer, desc->bd_portal, xid, 0);
 140
 141         if (rc != 0) {
 142                 /* Can't send, so we unlink the MD bound above.  The UNLINK
 143                  * event this creates will signal completion with failure,
 144                  * so we return SUCCESS here! */
 145                 CERROR("Transfer(%s, %d, "LPX64") failed: %d\n",
 146                        libcfs_id2str(conn->c_peer), desc->bd_portal, xid, rc);
 147                 rc2 = LNetMDUnlink(desc->bd_md_h);
 148                 LASSERT (rc2 == 0);
 149         }
 150
 151         RETURN(0);
 152 }
 153
 154 void ptlrpc_abort_bulk (struct ptlrpc_bulk_desc *desc)
 155 {
 156         /* Server side bulk abort. Idempotent. Not thread-safe (i.e. only
 157          * serialises with completion callback) */
 158         struct l_wait_info lwi;
 159         int                rc;
 160
 161         LASSERT (!in_interrupt ());             /* might sleep */
 162
 163         if (!ptlrpc_bulk_active(desc))          /* completed or */
 164                 return;                         /* never started */
 165
 166         /* Do not send any meaningful data over the wire for evicted clients */
 167         if (desc->bd_export && desc->bd_export->exp_failed)
 168                 ptl_rpc_wipe_bulk_pages(desc);
 169
 170         /* The unlink ensures the callback happens ASAP and is the last
 171          * one.  If it fails, it must be because completion just happened,
 172          * but we must still l_wait_event() in this case, to give liblustre
 173          * a chance to run server_bulk_callback()*/
 174
 175         LNetMDUnlink (desc->bd_md_h);
 176
 177         for (;;) {
 178                 /* Network access will complete in finite time but the HUGE
 179                  * timeout lets us CWARN for visibility of sluggish NALs */
 180                 lwi = LWI_TIMEOUT (cfs_time_seconds(300), NULL, NULL);
 181                 rc = l_wait_event(desc->bd_waitq,
 182                                   !ptlrpc_bulk_active(desc), &lwi);
 183                 if (rc == 0)
 184                         return;
 185
 186                 LASSERT(rc == -ETIMEDOUT);
 187                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 188         }
 189 }
 190
 191 int ptlrpc_register_bulk (struct ptlrpc_request *req)
 192 {
 193         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 194         lnet_process_id_t peer;
 195         int rc;
 196         int rc2;
 197         lnet_handle_me_t  me_h;
 198         lnet_md_t         md;
 199         ENTRY;
 200
 201         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
 202                 RETURN(0);
 203
 204         /* NB no locking required until desc is on the network */
 205         LASSERT (desc->bd_nob > 0);
 206         LASSERT (!desc->bd_network_rw);
 207         LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
 208         LASSERT (desc->bd_req != NULL);
 209         LASSERT (desc->bd_type == BULK_PUT_SINK ||
 210                  desc->bd_type == BULK_GET_SOURCE);
 211
 212         desc->bd_success = 0;
 213
 214         peer = desc->bd_import->imp_connection->c_peer;
 215
 216         md.user_ptr = &desc->bd_cbid;
 217         md.eq_handle = ptlrpc_eq_h;
 218         md.threshold = 1;                       /* PUT or GET */
 219         md.options = PTLRPC_MD_OPTIONS |
 220                      ((desc->bd_type == BULK_GET_SOURCE) ?
 221                       LNET_MD_OP_GET : LNET_MD_OP_PUT);
 222         ptlrpc_fill_bulk_md(&md, desc);
 223
 224         LASSERT (desc->bd_cbid.cbid_fn == client_bulk_callback);
 225         LASSERT (desc->bd_cbid.cbid_arg == desc);
 226
 227         /* XXX Registering the same xid on retried bulk makes my head
 228          * explode trying to understand how the original request's bulk
 229          * might interfere with the retried request -eeb */
 230         LASSERTF (!desc->bd_registered || req->rq_xid != desc->bd_last_xid,
 231                   "registered: %d  rq_xid: "LPU64" bd_last_xid: "LPU64"\n",
 232                   desc->bd_registered, req->rq_xid, desc->bd_last_xid);
 233         desc->bd_registered = 1;
 234         desc->bd_last_xid = req->rq_xid;
 235
 236         rc = LNetMEAttach(desc->bd_portal, peer,
 237                          req->rq_xid, 0, LNET_UNLINK, LNET_INS_AFTER, &me_h);
 238         if (rc != 0) {
 239                 CERROR("LNetMEAttach failed: %d\n", rc);
 240                 LASSERT (rc == -ENOMEM);
 241                 RETURN (-ENOMEM);
 242         }
 243
 244         /* About to let the network at it... */
 245         desc->bd_network_rw = 1;
 246         rc = LNetMDAttach(me_h, md, LNET_UNLINK, &desc->bd_md_h);
 247         if (rc != 0) {
 248                 CERROR("LNetMDAttach failed: %d\n", rc);
 249                 LASSERT (rc == -ENOMEM);
 250                 desc->bd_network_rw = 0;
 251                 rc2 = LNetMEUnlink (me_h);
 252                 LASSERT (rc2 == 0);
 253                 RETURN (-ENOMEM);
 254         }
 255
 256         CDEBUG(D_NET, "Setup bulk %s buffers: %u pages %u bytes, xid "LPX64", "
 257                "portal %u\n",
 258                desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
 259                desc->bd_iov_count, desc->bd_nob,
 260                req->rq_xid, desc->bd_portal);
 261         RETURN(0);
 262 }
 263
 264 void ptlrpc_unregister_bulk (struct ptlrpc_request *req)
 265 {
 266         /* Disconnect a bulk desc from the network. Idempotent. Not
 267          * thread-safe (i.e. only interlocks with completion callback). */
 268         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 269         cfs_waitq_t             *wq;
 270         struct l_wait_info       lwi;
 271         int                      rc;
 272
 273         LASSERT (!in_interrupt ());     /* might sleep */
 274
 275         if (!ptlrpc_bulk_active(desc))  /* completed or */
 276                 return;                 /* never registered */
 277
 278         LASSERT (desc->bd_req == req);  /* bd_req NULL until registered */
 279
 280         /* the unlink ensures the callback happens ASAP and is the last
 281          * one.  If it fails, it must be because completion just happened,
 282          * but we must still l_wait_event() in this case to give liblustre
 283          * a chance to run client_bulk_callback() */
 284
 285         LNetMDUnlink (desc->bd_md_h);
 286
 287         if (req->rq_set != NULL)
 288                 wq = &req->rq_set->set_waitq;
 289         else
 290                 wq = &req->rq_reply_waitq;
 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                 lwi = LWI_TIMEOUT (cfs_time_seconds(300), NULL, NULL);
 296                 rc = l_wait_event(*wq, !ptlrpc_bulk_active(desc), &lwi);
 297                 if (rc == 0)
 298                         return;
 299
 300                 LASSERT (rc == -ETIMEDOUT);
 301                 DEBUG_REQ(D_WARNING,req,"Unexpectedly long timeout: desc %p",
 302                           desc);
 303         }
 304 }
 305
 306 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
 307 {
 308         struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
 309         int service_time = max_t(int, cfs_time_current_sec() -
 310                                  req->rq_arrival_time.tv_sec, 1);
 311
 312         if (!(flags & PTLRPC_REPLY_EARLY) &&
 313             (req->rq_type != PTL_RPC_MSG_ERR)) {
 314                 /* early replies and errors don't count toward our service
 315                    time estimate */
 316                 int oldse = at_add(&svc->srv_at_estimate, service_time);
 317                 if (oldse != 0)
 318                         DEBUG_REQ(D_ADAPTTO, req,
 319                                   "svc %s changed estimate from %d to %d",
 320                                   svc->srv_name, oldse,
 321                                   at_get(&svc->srv_at_estimate));
 322         }
 323         /* Report actual service time for client latency calc */
 324         lustre_msg_set_service_time(req->rq_repmsg, service_time);
 325         /* Report service time estimate for future client reqs, but report 0
 326          * (to be ignored by client) if it's a error reply during recovery.
 327          * (bz15815) */
 328         if (req->rq_type == PTL_RPC_MSG_ERR &&
 329             (req->rq_export == NULL || req->rq_export->exp_obd->obd_recovering))
 330                 lustre_msg_set_timeout(req->rq_repmsg, 0);
 331         else
 332                 lustre_msg_set_timeout(req->rq_repmsg,
 333                                        at_get(&svc->srv_at_estimate));
 334
 335         if (req->rq_reqmsg &&
 336             !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
 337                 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
 338                        "req_flags=%#x magic=%d:%x/%x len=%d\n",
 339                        flags, lustre_msg_get_flags(req->rq_reqmsg),
 340                        lustre_msg_is_v1(req->rq_reqmsg),
 341                        lustre_msg_get_magic(req->rq_reqmsg),
 342                        lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
 343         }
 344 }
 345
 346 int ptlrpc_send_reply (struct ptlrpc_request *req, int flags)
 347 {
 348         struct ptlrpc_service     *svc = req->rq_rqbd->rqbd_service;
 349         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 350         struct ptlrpc_connection  *conn;
 351         int                        rc;
 352
 353         /* We must already have a reply buffer (only ptlrpc_error() may be
 354          * called without one). The reply generated by sptlrpc layer (e.g.
 355          * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
 356          * have a request buffer which is either the actual (swabbed) incoming
 357          * request, or a saved copy if this is a req saved in
 358          * target_queue_final_reply().
 359          */
 360         LASSERT (req->rq_no_reply == 0);
 361         LASSERT (req->rq_reqbuf != NULL);
 362         LASSERT (rs != NULL);
 363         LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
 364         LASSERT (req->rq_repmsg != NULL);
 365         LASSERT (req->rq_repmsg == rs->rs_msg);
 366         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
 367         LASSERT (rs->rs_cb_id.cbid_arg == rs);
 368
 369         /* There may be no rq_export during failover */
 370
 371         if (unlikely(req->rq_export && req->rq_export->exp_obd &&
 372                      req->rq_export->exp_obd->obd_fail)) {
 373                 /* Failed obd's only send ENODEV */
 374                 req->rq_type = PTL_RPC_MSG_ERR;
 375                 req->rq_status = -ENODEV;
 376                 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
 377                        req->rq_export->exp_obd->obd_minor);
 378         }
 379
 380         if (req->rq_type != PTL_RPC_MSG_ERR)
 381                 req->rq_type = PTL_RPC_MSG_REPLY;
 382
 383         lustre_msg_set_type(req->rq_repmsg, req->rq_type);
 384         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
 385         lustre_msg_set_opc(req->rq_repmsg,
 386                 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
 387
 388         target_pack_pool_reply(req);
 389
 390         ptlrpc_at_set_reply(req, flags);
 391
 392         if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
 393                 conn = ptlrpc_get_connection(req->rq_peer, req->rq_self, NULL);
 394         else
 395                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
 396
 397         if (unlikely(conn == NULL)) {
 398                 CERROR("not replying on NULL connection\n"); /* bug 9635 */
 399                 return -ENOTCONN;
 400         }
 401         atomic_inc (&svc->srv_outstanding_replies);
 402         ptlrpc_rs_addref(rs);                   /* +1 ref for the network */
 403
 404         rc = sptlrpc_svc_wrap_reply(req);
 405         if (unlikely(rc))
 406                 goto out;
 407
 408         req->rq_sent = cfs_time_current_sec();
 409
 410         rc = ptl_send_buf (&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
 411                            rs->rs_difficult ? LNET_ACK_REQ : LNET_NOACK_REQ,
 412                            &rs->rs_cb_id, conn, svc->srv_rep_portal,
 413                            req->rq_xid, req->rq_reply_off);
 414 out:
 415         if (unlikely(rc != 0)) {
 416                 atomic_dec (&svc->srv_outstanding_replies);
 417                 ptlrpc_req_drop_rs(req);
 418         }
 419         ptlrpc_put_connection(conn);
 420         return rc;
 421 }
 422
 423 int ptlrpc_reply (struct ptlrpc_request *req)
 424 {
 425         if (req->rq_no_reply)
 426                 return 0;
 427         else
 428                 return (ptlrpc_send_reply(req, 0));
 429 }
 430
 431 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
 432 {
 433         int rc;
 434         ENTRY;
 435
 436         if (req->rq_no_reply)
 437                 RETURN(0);
 438
 439         if (!req->rq_repmsg) {
 440                 rc = lustre_pack_reply(req, 1, NULL, NULL);
 441                 if (rc)
 442                         RETURN(rc);
 443         }
 444
 445         req->rq_type = PTL_RPC_MSG_ERR;
 446
 447         rc = ptlrpc_send_reply(req, may_be_difficult);
 448         RETURN(rc);
 449 }
 450
 451 int ptlrpc_error(struct ptlrpc_request *req)
 452 {
 453         return ptlrpc_send_error(req, 0);
 454 }
 455
 456 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
 457 {
 458         int rc;
 459         int rc2;
 460         struct ptlrpc_connection *connection;
 461         lnet_handle_me_t  reply_me_h;
 462         lnet_md_t         reply_md;
 463         struct obd_device *obd = request->rq_import->imp_obd;
 464         ENTRY;
 465
 466         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
 467                 RETURN(0);
 468
 469         LASSERT (request->rq_type == PTL_RPC_MSG_REQUEST);
 470
 471         /* If this is a re-transmit, we're required to have disengaged
 472          * cleanly from the previous attempt */
 473         LASSERT (!request->rq_receiving_reply);
 474
 475         if (request->rq_import->imp_obd &&
 476             request->rq_import->imp_obd->obd_fail) {
 477                 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
 478                        request->rq_import->imp_obd->obd_name);
 479                 /* this prevents us from waiting in ptlrpc_queue_wait */
 480                 request->rq_err = 1;
 481                 RETURN(-ENODEV);
 482         }
 483
 484         connection = request->rq_import->imp_connection;
 485
 486         lustre_msg_set_handle(request->rq_reqmsg,
 487                               &request->rq_import->imp_remote_handle);
 488         lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
 489         lustre_msg_set_conn_cnt(request->rq_reqmsg,
 490                                 request->rq_import->imp_conn_cnt);
 491         lustre_msghdr_set_flags(request->rq_reqmsg,
 492                                 request->rq_import->imp_msghdr_flags);
 493
 494         rc = sptlrpc_cli_wrap_request(request);
 495         if (rc)
 496                 RETURN(rc);
 497
 498         /* bulk register should be done after wrap_request() */
 499         if (request->rq_bulk != NULL) {
 500                 rc = ptlrpc_register_bulk (request);
 501                 if (rc != 0)
 502                         RETURN(rc);
 503         }
 504
 505         if (!noreply) {
 506                 LASSERT (request->rq_replen != 0);
 507                 if (request->rq_repbuf == NULL) {
 508                         LASSERT(request->rq_repdata == NULL);
 509                         LASSERT(request->rq_repmsg == NULL);
 510                         rc = sptlrpc_cli_alloc_repbuf(request,
 511                                                       request->rq_replen);
 512                         if (rc)
 513                                 GOTO(cleanup_bulk, rc);
 514                 } else {
 515                         request->rq_repdata = NULL;
 516                         request->rq_repmsg = NULL;
 517                 }
 518
 519                 rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/
 520                                   connection->c_peer, request->rq_xid, 0,
 521                                   LNET_UNLINK, LNET_INS_AFTER, &reply_me_h);
 522                 if (rc != 0) {
 523                         CERROR("LNetMEAttach failed: %d\n", rc);
 524                         LASSERT (rc == -ENOMEM);
 525                         GOTO(cleanup_bulk, rc = -ENOMEM);
 526                 }
 527         }
 528
 529         spin_lock(&request->rq_lock);
 530         /* If the MD attach succeeds, there _will_ be a reply_in callback */
 531         request->rq_receiving_reply = !noreply;
 532         /* We are responsible for unlinking the reply buffer */
 533         request->rq_must_unlink = !noreply;
 534         /* Clear any flags that may be present from previous sends. */
 535         request->rq_replied = 0;
 536         request->rq_err = 0;
 537         request->rq_timedout = 0;
 538         request->rq_net_err = 0;
 539         request->rq_resend = 0;
 540         request->rq_restart = 0;
 541         spin_unlock(&request->rq_lock);
 542
 543         if (!noreply) {
 544                 reply_md.start     = request->rq_repbuf;
 545                 reply_md.length    = request->rq_repbuf_len;
 546                 /* Allow multiple early replies */
 547                 reply_md.threshold = LNET_MD_THRESH_INF;
 548                 /* Manage remote for early replies */
 549                 reply_md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
 550                         LNET_MD_MANAGE_REMOTE;
 551                 reply_md.user_ptr  = &request->rq_reply_cbid;
 552                 reply_md.eq_handle = ptlrpc_eq_h;
 553
 554                 /* We must see the unlink callback to unset rq_must_unlink,
 555                    so we can't auto-unlink */
 556                 rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN,
 557                                   &request->rq_reply_md_h);
 558                 if (rc != 0) {
 559                         CERROR("LNetMDAttach failed: %d\n", rc);
 560                         LASSERT (rc == -ENOMEM);
 561                         spin_lock(&request->rq_lock);
 562                         /* ...but the MD attach didn't succeed... */
 563                         request->rq_receiving_reply = 0;
 564                         spin_unlock(&request->rq_lock);
 565                         GOTO(cleanup_me, rc -ENOMEM);
 566                 }
 567
 568                 CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid "LPU64
 569                        ", portal %u\n",
 570                        request->rq_repbuf_len, request->rq_xid,
 571                        request->rq_reply_portal);
 572         }
 573
 574         /* add references on request for request_out_callback */
 575         ptlrpc_request_addref(request);
 576         if (obd->obd_svc_stats != NULL)
 577                 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
 578                                     request->rq_import->imp_inflight.counter);
 579
 580         OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
 581
 582         do_gettimeofday(&request->rq_arrival_time);
 583         request->rq_sent = cfs_time_current_sec();
 584         /* We give the server rq_timeout secs to process the req, and
 585            add the network latency for our local timeout. */
 586         request->rq_deadline = request->rq_sent + request->rq_timeout +
 587                 ptlrpc_at_get_net_latency(request);
 588
 589         ptlrpc_pinger_sending_on_import(request->rq_import);
 590
 591         DEBUG_REQ(D_INFO, request, "send flg=%x",
 592                   lustre_msg_get_flags(request->rq_reqmsg));
 593         rc = ptl_send_buf(&request->rq_req_md_h,
 594                           request->rq_reqbuf, request->rq_reqdata_len,
 595                           LNET_NOACK_REQ, &request->rq_req_cbid,
 596                           connection,
 597                           request->rq_request_portal,
 598                           request->rq_xid, 0);
 599         if (rc == 0) {
 600                 ptlrpc_lprocfs_rpc_sent(request);
 601                 RETURN(rc);
 602         }
 603
 604         ptlrpc_req_finished(request);
 605         if (noreply)
 606                 RETURN(rc);
 607
 608  cleanup_me:
 609         /* MEUnlink is safe; the PUT didn't even get off the ground, and
 610          * nobody apart from the PUT's target has the right nid+XID to
 611          * access the reply buffer. */
 612         rc2 = LNetMEUnlink(reply_me_h);
 613         LASSERT (rc2 == 0);
 614         /* UNLINKED callback called synchronously */
 615         LASSERT (!request->rq_receiving_reply);
 616
 617  cleanup_bulk:
 618         if (request->rq_bulk != NULL)
 619                 ptlrpc_unregister_bulk(request);
 620
 621         return rc;
 622 }
 623
 624 int ptlrpc_register_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
 625 {
 626         struct ptlrpc_service   *service = rqbd->rqbd_service;
 627         static lnet_process_id_t  match_id = {LNET_NID_ANY, LNET_PID_ANY};
 628         int                      rc;
 629         lnet_md_t                 md;
 630         lnet_handle_me_t          me_h;
 631
 632         CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
 633                service->srv_req_portal);
 634
 635         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
 636                 return (-ENOMEM);
 637
 638         rc = LNetMEAttach(service->srv_req_portal,
 639                           match_id, 0, ~0, LNET_UNLINK, LNET_INS_AFTER, &me_h);
 640         if (rc != 0) {
 641                 CERROR("LNetMEAttach failed: %d\n", rc);
 642                 return (-ENOMEM);
 643         }
 644
 645         LASSERT(rqbd->rqbd_refcount == 0);
 646         rqbd->rqbd_refcount = 1;
 647
 648         md.start     = rqbd->rqbd_buffer;
 649         md.length    = service->srv_buf_size;
 650         md.max_size  = service->srv_max_req_size;
 651         md.threshold = LNET_MD_THRESH_INF;
 652         md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
 653         md.user_ptr  = &rqbd->rqbd_cbid;
 654         md.eq_handle = ptlrpc_eq_h;
 655
 656         rc = LNetMDAttach(me_h, md, LNET_UNLINK, &rqbd->rqbd_md_h);
 657         if (rc == 0)
 658                 return (0);
 659
 660         CERROR("LNetMDAttach failed: %d; \n", rc);
 661         LASSERT (rc == -ENOMEM);
 662         rc = LNetMEUnlink (me_h);
 663         LASSERT (rc == 0);
 664         rqbd->rqbd_refcount = 0;
 665
 666         return (-ENOMEM);
 667 }