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 Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_RPC
  24 #ifndef __KERNEL__
  25 #include <liblustre.h>
  26 #include <portals/lib-types.h>
  27 #endif
  28 #include <linux/obd_support.h>
  29 #include <linux/lustre_net.h>
  30 #include <linux/lustre_lib.h>
  31 #include <linux/obd.h>
  32 #include "ptlrpc_internal.h"
  33
  34 static int ptl_send_buf (ptl_handle_md_t *mdh, void *base, int len,
  35                          ptl_ack_req_t ack, struct ptlrpc_cb_id *cbid,
  36                          struct ptlrpc_connection *conn, int portal, __u64 xid)
  37 {
  38         ptl_process_id_t remote_id;
  39         int              rc;
  40         int              rc2;
  41         ptl_md_t         md;
  42         char str[PTL_NALFMT_SIZE];
  43         ENTRY;
  44
  45         LASSERT (portal != 0);
  46         LASSERT (conn != NULL);
  47         CDEBUG (D_INFO, "conn=%p ni %s nid "LPX64" (%s) on %s\n",
  48                 conn, conn->c_peer.peer_ni->pni_name,
  49                 conn->c_peer.peer_nid,
  50                 portals_nid2str(conn->c_peer.peer_ni->pni_number,
  51                                 conn->c_peer.peer_nid, str),
  52                 conn->c_peer.peer_ni->pni_name);
  53
  54         remote_id.nid = conn->c_peer.peer_nid,
  55         remote_id.pid = 0;
  56
  57         md.start     = base;
  58         md.length    = len;
  59         md.threshold = (ack == PTL_ACK_REQ) ? 2 : 1;
  60         md.options   = PTLRPC_MD_OPTIONS;
  61         md.user_ptr  = cbid;
  62         md.eventq    = conn->c_peer.peer_ni->pni_eq_h;
  63
  64         if (ack == PTL_ACK_REQ &&
  65             OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_ACK | OBD_FAIL_ONCE)) {
  66                 /* don't ask for the ack to simulate failing client */
  67                 ack = PTL_NOACK_REQ;
  68                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
  69         }
  70
  71         rc = PtlMDBind (conn->c_peer.peer_ni->pni_ni_h, md,
  72                         PTL_UNLINK, mdh);
  73         if (rc != PTL_OK) {
  74                 CERROR ("PtlMDBind failed: %d\n", rc);
  75                 LASSERT (rc == PTL_NO_SPACE);
  76                 RETURN (-ENOMEM);
  77         }
  78
  79         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid "LPD64"\n",
  80                len, portal, xid);
  81
  82         rc2 = PtlPut (*mdh, ack, remote_id, portal, 0, xid, 0, 0);
  83         if (rc != PTL_OK) {
  84                 /* We're going to get an UNLINK event when I unlink below,
  85                  * which will complete just like any other failed send, so
  86                  * I fall through and return success here! */
  87                 CERROR("PtlPut("LPU64", %d, "LPD64") failed: %d\n",
  88                        remote_id.nid, portal, xid, rc);
  89                 rc2 = PtlMDUnlink(*mdh);
  90                 LASSERT (rc2 == PTL_OK);
  91         }
  92
  93         RETURN (0);
  94 }
  95
  96 static void ptlrpc_fill_md(ptl_md_t *md, struct ptlrpc_bulk_desc *desc)
  97 {
  98         LASSERT(ptl_md_max_iovs() == 0  ||
  99                 (desc->bd_iov_count <= ptl_md_max_iovs()));
 100
 101         if (ptl_requires_iov() || desc->bd_iov_count > 0) {
 102                 md->options |= PTLRPC_PTL_MD_IOV;
 103                 md->start = &desc->bd_iov[0];
 104                 md->niov = desc->bd_iov_count;
 105         } else {
 106                 md->start = ptl_iov_base(&desc->bd_iov[0]);
 107         }
 108 }
 109
 110 int ptlrpc_start_bulk_transfer (struct ptlrpc_bulk_desc *desc)
 111 {
 112         int                 rc;
 113         int                 rc2;
 114         struct ptlrpc_peer *peer;
 115         ptl_process_id_t    remote_id;
 116         ptl_md_t            md;
 117         __u64               xid;
 118         ENTRY;
 119
 120         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_BULK_PUT_NET))
 121                 RETURN(0);
 122
 123         /* NB no locking required until desc is on the network */
 124         LASSERT (!desc->bd_network_rw);
 125         LASSERT (desc->bd_type == BULK_PUT_SOURCE ||
 126                  desc->bd_type == BULK_GET_SINK);
 127         desc->bd_success = 0;
 128         peer = &desc->bd_export->exp_connection->c_peer;
 129
 130         md.length = desc->bd_nob;
 131         md.eventq = peer->peer_ni->pni_eq_h;
 132         md.threshold = 2; /* SENT and ACK/REPLY */
 133         md.options = PTLRPC_MD_OPTIONS;
 134
 135         ptlrpc_fill_md(&md, desc);
 136         md.user_ptr = &desc->bd_cbid;
 137         LASSERT (desc->bd_cbid.cbid_fn == server_bulk_callback);
 138         LASSERT (desc->bd_cbid.cbid_arg == desc);
 139
 140         /* NB total length may be 0 for a read past EOF, so we send a 0
 141          * length bulk, since the client expects a bulk event. */
 142
 143         rc = PtlMDBind(peer->peer_ni->pni_ni_h, md,
 144                        PTL_UNLINK, &desc->bd_md_h);
 145         if (rc != PTL_OK) {
 146                 CERROR("PtlMDBind failed: %d\n", rc);
 147                 LASSERT (rc == PTL_NO_SPACE);
 148                 RETURN(-ENOMEM);
 149         }
 150
 151         /* Client's bulk and reply matchbits are the same */
 152         xid = desc->bd_req->rq_xid;
 153         remote_id.nid = peer->peer_nid;
 154         remote_id.pid = 0;
 155
 156         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d on %s "
 157                "nid "LPX64" pid %d xid "LPX64"\n",
 158                md.niov, md.length, desc->bd_portal, peer->peer_ni->pni_name,
 159                remote_id.nid, remote_id.pid, xid);
 160
 161         /* Network is about to get at the memory */
 162         desc->bd_network_rw = 1;
 163
 164         if (desc->bd_type == BULK_PUT_SOURCE)
 165                 rc = PtlPut (desc->bd_md_h, PTL_ACK_REQ, remote_id,
 166                              desc->bd_portal, 0, xid, 0, 0);
 167         else
 168                 rc = PtlGet (desc->bd_md_h, remote_id,
 169                              desc->bd_portal, 0, xid, 0);
 170
 171         if (rc != PTL_OK) {
 172                 /* Can't send, so we unlink the MD bound above.  The UNLINK
 173                  * event this creates will signal completion with failure,
 174                  * so we return SUCCESS here! */
 175                 CERROR("Transfer("LPU64", %d, "LPX64") failed: %d\n",
 176                        remote_id.nid, desc->bd_portal, xid, rc);
 177                 rc2 = PtlMDUnlink(desc->bd_md_h);
 178                 LASSERT (rc2 == PTL_OK);
 179         }
 180
 181         RETURN(0);
 182 }
 183
 184 void ptlrpc_abort_bulk (struct ptlrpc_bulk_desc *desc)
 185 {
 186         /* Server side bulk abort. Idempotent. Not thread-safe (i.e. only
 187          * serialises with completion callback) */
 188         struct l_wait_info lwi;
 189         int                rc;
 190
 191         LASSERT (!in_interrupt ());             /* might sleep */
 192
 193         if (!ptlrpc_bulk_active(desc))          /* completed or */
 194                 return;                         /* never started */
 195
 196         /* The unlink ensures the callback happens ASAP and is the last
 197          * one.  If it fails, it must be because completion just happened,
 198          * but we must still l_wait_event() in this case, to give liblustre
 199          * a chance to run server_bulk_callback()*/
 200
 201         PtlMDUnlink (desc->bd_md_h);
 202
 203         for (;;) {
 204                 /* Network access will complete in finite time but the HUGE
 205                  * timeout lets us CWARN for visibility of sluggish NALs */
 206                 lwi = LWI_TIMEOUT (300 * HZ, NULL, NULL);
 207                 rc = l_wait_event(desc->bd_waitq,
 208                                   !ptlrpc_bulk_active(desc), &lwi);
 209                 if (rc == 0)
 210                         return;
 211
 212                 LASSERT(rc == -ETIMEDOUT);
 213                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 214         }
 215 }
 216
 217 int ptlrpc_register_bulk (struct ptlrpc_request *req)
 218 {
 219         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 220         struct ptlrpc_peer *peer;
 221         int rc;
 222         int rc2;
 223         ptl_process_id_t source_id;
 224         ptl_handle_me_t  me_h;
 225         ptl_md_t         md;
 226         ENTRY;
 227
 228         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_BULK_GET_NET))
 229                 RETURN(0);
 230
 231         /* NB no locking required until desc is on the network */
 232         LASSERT (desc->bd_nob > 0);
 233         LASSERT (!desc->bd_network_rw);
 234         LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
 235         LASSERT (desc->bd_req != NULL);
 236         LASSERT (desc->bd_type == BULK_PUT_SINK ||
 237                  desc->bd_type == BULK_GET_SOURCE);
 238
 239         desc->bd_success = 0;
 240
 241         peer = &desc->bd_import->imp_connection->c_peer;
 242
 243         md.length = desc->bd_nob;
 244         md.eventq = peer->peer_ni->pni_eq_h;
 245         md.threshold = 1;                       /* PUT or GET */
 246         md.options = PTLRPC_MD_OPTIONS |
 247                      ((desc->bd_type == BULK_GET_SOURCE) ?
 248                       PTL_MD_OP_GET : PTL_MD_OP_PUT);
 249         ptlrpc_fill_md(&md, desc);
 250         md.user_ptr = &desc->bd_cbid;
 251         LASSERT (desc->bd_cbid.cbid_fn == client_bulk_callback);
 252         LASSERT (desc->bd_cbid.cbid_arg == desc);
 253
 254         /* XXX Registering the same xid on retried bulk makes my head
 255          * explode trying to understand how the original request's bulk
 256          * might interfere with the retried request -eeb */
 257         LASSERT (!desc->bd_registered || req->rq_xid != desc->bd_last_xid);
 258         desc->bd_registered = 1;
 259         desc->bd_last_xid = req->rq_xid;
 260
 261         source_id.nid = desc->bd_import->imp_connection->c_peer.peer_nid;
 262         source_id.pid = PTL_PID_ANY;
 263
 264         rc = PtlMEAttach(peer->peer_ni->pni_ni_h,
 265                          desc->bd_portal, source_id, req->rq_xid, 0,
 266                          PTL_UNLINK, PTL_INS_AFTER, &me_h);
 267         if (rc != PTL_OK) {
 268                 CERROR("PtlMEAttach failed: %d\n", rc);
 269                 LASSERT (rc == PTL_NO_SPACE);
 270                 RETURN (-ENOMEM);
 271         }
 272
 273         /* About to let the network at it... */
 274         desc->bd_network_rw = 1;
 275         rc = PtlMDAttach(me_h, md, PTL_UNLINK, &desc->bd_md_h);
 276         if (rc != PTL_OK) {
 277                 CERROR("PtlMDAttach failed: %d\n", rc);
 278                 LASSERT (rc == PTL_NO_SPACE);
 279                 desc->bd_network_rw = 0;
 280                 rc2 = PtlMEUnlink (me_h);
 281                 LASSERT (rc2 == PTL_OK);
 282                 RETURN (-ENOMEM);
 283         }
 284
 285         CDEBUG(D_NET, "Setup bulk %s buffers: %u pages %u bytes, xid "LPX64", "
 286                "portal %u on %s\n",
 287                desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
 288                md.niov, md.length,
 289                req->rq_xid, desc->bd_portal, peer->peer_ni->pni_name);
 290         RETURN(0);
 291 }
 292
 293 void ptlrpc_unregister_bulk (struct ptlrpc_request *req)
 294 {
 295         /* Disconnect a bulk desc from the network. Idempotent. Not
 296          * thread-safe (i.e. only interlocks with completion callback). */
 297         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 298         wait_queue_head_t       *wq;
 299         struct l_wait_info       lwi;
 300         int                      rc;
 301
 302         LASSERT (!in_interrupt ());             /* might sleep */
 303
 304         if (!ptlrpc_bulk_active(desc))          /* completed or */
 305                 return;                         /* never registered */
 306
 307         LASSERT (desc->bd_req == req);          /* bd_req NULL until registered */
 308
 309         /* the unlink ensures the callback happens ASAP and is the last
 310          * one.  If it fails, it must be because completion just happened,
 311          * but we must still l_wait_event() in this case to give liblustre
 312          * a chance to run client_bulk_callback() */
 313
 314         PtlMDUnlink (desc->bd_md_h);
 315
 316         if (desc->bd_req->rq_set != NULL)
 317                 wq = &req->rq_set->set_waitq;
 318         else
 319                 wq = &req->rq_reply_waitq;
 320
 321         for (;;) {
 322                 /* Network access will complete in finite time but the HUGE
 323                  * timeout lets us CWARN for visibility of sluggish NALs */
 324                 lwi = LWI_TIMEOUT (300 * HZ, NULL, NULL);
 325                 rc = l_wait_event(*wq, !ptlrpc_bulk_active(desc), &lwi);
 326                 if (rc == 0)
 327                         return;
 328
 329                 LASSERT (rc == -ETIMEDOUT);
 330                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 331         }
 332 }
 333
 334 int ptlrpc_send_reply (struct ptlrpc_request *req, int may_be_difficult)
 335 {
 336         struct ptlrpc_service     *svc = req->rq_rqbd->rqbd_srv_ni->sni_service;
 337         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 338         struct ptlrpc_connection  *conn;
 339         int                        rc;
 340
 341         /* We must already have a reply buffer (only ptlrpc_error() may be
 342          * called without one).  We must also have a request buffer which
 343          * is either the actual (swabbed) incoming request, or a saved copy
 344          * if this is a req saved in target_queue_final_reply(). */
 345         LASSERT (req->rq_reqmsg != NULL);
 346         LASSERT (rs != NULL);
 347         LASSERT (req->rq_repmsg != NULL);
 348         LASSERT (may_be_difficult || !rs->rs_difficult);
 349         LASSERT (req->rq_repmsg == &rs->rs_msg);
 350         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
 351         LASSERT (rs->rs_cb_id.cbid_arg == rs);
 352
 353         LASSERT (req->rq_repmsg != NULL);
 354         if (req->rq_type != PTL_RPC_MSG_ERR)
 355                 req->rq_type = PTL_RPC_MSG_REPLY;
 356
 357         req->rq_repmsg->type   = req->rq_type;
 358         req->rq_repmsg->status = req->rq_status;
 359         req->rq_repmsg->opc    = req->rq_reqmsg->opc;
 360
 361         if (req->rq_export == NULL)
 362                 conn = ptlrpc_get_connection(&req->rq_peer, NULL);
 363         else
 364                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
 365
 366         atomic_inc (&svc->srv_outstanding_replies);
 367
 368         rc = ptl_send_buf (&rs->rs_md_h, req->rq_repmsg, req->rq_replen,
 369                            rs->rs_difficult ? PTL_ACK_REQ : PTL_NOACK_REQ,
 370                            &rs->rs_cb_id, conn,
 371                            svc->srv_rep_portal, req->rq_xid);
 372         if (rc != 0) {
 373                 atomic_dec (&svc->srv_outstanding_replies);
 374
 375                 if (!rs->rs_difficult) {
 376                         /* Callers other than target_send_reply() expect me
 377                          * to clean up on a comms error */
 378                         lustre_free_reply_state (rs);
 379                         req->rq_reply_state = NULL;
 380                         req->rq_repmsg = NULL;
 381                 }
 382         }
 383         ptlrpc_put_connection(conn);
 384         return rc;
 385 }
 386
 387 int ptlrpc_reply (struct ptlrpc_request *req)
 388 {
 389         return (ptlrpc_send_reply (req, 0));
 390 }
 391
 392 int ptlrpc_error(struct ptlrpc_request *req)
 393 {
 394         int rc;
 395         ENTRY;
 396
 397         if (!req->rq_repmsg) {
 398                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 399                 if (rc)
 400                         RETURN(rc);
 401         }
 402
 403         req->rq_type = PTL_RPC_MSG_ERR;
 404
 405         rc = ptlrpc_send_reply (req, 0);
 406         RETURN(rc);
 407 }
 408
 409 int ptl_send_rpc(struct ptlrpc_request *request)
 410 {
 411         int rc;
 412         int rc2;
 413         struct ptlrpc_connection *connection;
 414         unsigned long flags;
 415         ptl_process_id_t source_id;
 416         ptl_handle_me_t  reply_me_h;
 417         ptl_md_t         reply_md;
 418         ENTRY;
 419
 420         LASSERT (request->rq_type == PTL_RPC_MSG_REQUEST);
 421
 422         /* If this is a re-transmit, we're required to have disengaged
 423          * cleanly from the previous attempt */
 424         LASSERT (!request->rq_receiving_reply);
 425
 426         connection = request->rq_import->imp_connection;
 427
 428         if (request->rq_bulk != NULL) {
 429                 rc = ptlrpc_register_bulk (request);
 430                 if (rc != 0)
 431                         RETURN(rc);
 432         }
 433
 434         request->rq_reqmsg->handle = request->rq_import->imp_remote_handle;
 435         request->rq_reqmsg->type = PTL_RPC_MSG_REQUEST;
 436         request->rq_reqmsg->conn_cnt = request->rq_import->imp_conn_cnt;
 437
 438         source_id.nid = connection->c_peer.peer_nid;
 439         source_id.pid = PTL_PID_ANY;
 440
 441         LASSERT (request->rq_replen != 0);
 442         if (request->rq_repmsg == NULL)
 443                 OBD_ALLOC(request->rq_repmsg, request->rq_replen);
 444         if (request->rq_repmsg == NULL)
 445                 GOTO(cleanup_bulk, rc = -ENOMEM);
 446
 447         rc = PtlMEAttach(connection->c_peer.peer_ni->pni_ni_h,
 448                          request->rq_reply_portal, /* XXX FIXME bug 249 */
 449                          source_id, request->rq_xid, 0, PTL_UNLINK,
 450                          PTL_INS_AFTER, &reply_me_h);
 451         if (rc != PTL_OK) {
 452                 CERROR("PtlMEAttach failed: %d\n", rc);
 453                 LASSERT (rc == PTL_NO_SPACE);
 454                 GOTO(cleanup_repmsg, rc = -ENOMEM);
 455         }
 456
 457         spin_lock_irqsave (&request->rq_lock, flags);
 458         /* If the MD attach succeeds, there _will_ be a reply_in callback */
 459         request->rq_receiving_reply = 1;
 460         /* Clear any flags that may be present from previous sends. */
 461         request->rq_replied = 0;
 462         request->rq_err = 0;
 463         request->rq_timedout = 0;
 464         request->rq_resend = 0;
 465         request->rq_restart = 0;
 466         spin_unlock_irqrestore (&request->rq_lock, flags);
 467
 468         reply_md.start     = request->rq_repmsg;
 469         reply_md.length    = request->rq_replen;
 470         reply_md.threshold = 1;
 471         reply_md.options   = PTLRPC_MD_OPTIONS | PTL_MD_OP_PUT;
 472         reply_md.user_ptr  = &request->rq_reply_cbid;
 473         reply_md.eventq    = connection->c_peer.peer_ni->pni_eq_h;
 474
 475         rc = PtlMDAttach(reply_me_h, reply_md, PTL_UNLINK,
 476                          &request->rq_reply_md_h);
 477         if (rc != PTL_OK) {
 478                 CERROR("PtlMDAttach failed: %d\n", rc);
 479                 LASSERT (rc == PTL_NO_SPACE);
 480                 GOTO(cleanup_me, rc -ENOMEM);
 481         }
 482
 483         CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid "LPU64
 484                ", portal %u on %s\n",
 485                request->rq_replen, request->rq_xid,
 486                request->rq_reply_portal,
 487                connection->c_peer.peer_ni->pni_name);
 488
 489         ptlrpc_request_addref(request);        /* +1 ref for the SENT callback */
 490
 491         request->rq_sent = LTIME_S(CURRENT_TIME);
 492         ptlrpc_pinger_sending_on_import(request->rq_import);
 493         rc = ptl_send_buf(&request->rq_req_md_h,
 494                           request->rq_reqmsg, request->rq_reqlen,
 495                           PTL_NOACK_REQ, &request->rq_req_cbid,
 496                           connection,
 497                           request->rq_request_portal,
 498                           request->rq_xid);
 499         if (rc == 0) {
 500                 ptlrpc_lprocfs_rpc_sent(request);
 501                 RETURN(rc);
 502         }
 503
 504         ptlrpc_req_finished (request);          /* drop callback ref */
 505
 506  cleanup_me:
 507         /* MEUnlink is safe; the PUT didn't even get off the ground, and
 508          * nobody apart from the PUT's target has the right nid+XID to
 509          * access the reply buffer. */
 510         rc2 = PtlMEUnlink(reply_me_h);
 511         LASSERT (rc2 == PTL_OK);
 512         /* UNLINKED callback called synchronously */
 513         LASSERT (!request->rq_receiving_reply);
 514
 515  cleanup_repmsg:
 516         OBD_FREE(request->rq_repmsg, request->rq_replen);
 517         request->rq_repmsg = NULL;
 518
 519  cleanup_bulk:
 520         if (request->rq_bulk != NULL)
 521                 ptlrpc_unregister_bulk(request);
 522
 523         return rc;
 524 }
 525
 526 int ptlrpc_register_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
 527 {
 528         struct ptlrpc_srv_ni    *srv_ni = rqbd->rqbd_srv_ni;
 529         struct ptlrpc_service   *service = srv_ni->sni_service;
 530         static ptl_process_id_t  match_id = {PTL_NID_ANY, PTL_PID_ANY};
 531         int                      rc;
 532         ptl_md_t                 md;
 533         ptl_handle_me_t          me_h;
 534
 535         CDEBUG(D_NET, "PtlMEAttach: portal %d on %s\n",
 536                service->srv_req_portal, srv_ni->sni_ni->pni_name);
 537
 538         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_RQBD))
 539                 return (-ENOMEM);
 540
 541         rc = PtlMEAttach(srv_ni->sni_ni->pni_ni_h, service->srv_req_portal,
 542                          match_id, 0, ~0, PTL_UNLINK, PTL_INS_AFTER, &me_h);
 543         if (rc != PTL_OK) {
 544                 CERROR("PtlMEAttach failed: %d\n", rc);
 545                 return (-ENOMEM);
 546         }
 547
 548         LASSERT(rqbd->rqbd_refcount == 0);
 549         rqbd->rqbd_refcount = 1;
 550
 551         md.start     = rqbd->rqbd_buffer;
 552         md.length    = service->srv_buf_size;
 553         md.max_size  = service->srv_max_req_size;
 554         md.threshold = PTL_MD_THRESH_INF;
 555         md.options   = PTLRPC_MD_OPTIONS | PTL_MD_OP_PUT | PTL_MD_MAX_SIZE;
 556         md.user_ptr  = &rqbd->rqbd_cbid;
 557         md.eventq    = srv_ni->sni_ni->pni_eq_h;
 558
 559         rc = PtlMDAttach(me_h, md, PTL_UNLINK, &rqbd->rqbd_md_h);
 560         if (rc == PTL_OK)
 561                 return (0);
 562
 563         CERROR("PtlMDAttach failed: %d; \n", rc);
 564         LASSERT (rc == PTL_NO_SPACE);
 565         rc = PtlMEUnlink (me_h);
 566         LASSERT (rc == PTL_OK);
 567         rqbd->rqbd_refcount = 0;
 568
 569         return (-ENOMEM);
 570 }