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 #endif
  27 #include <linux/obd_support.h>
  28 #include <linux/lustre_net.h>
  29 #include <linux/lustre_lib.h>
  30 #include <linux/obd.h>
  31 #include "ptlrpc_internal.h"
  32
  33 static int ptl_send_buf (ptl_handle_md_t *mdh, void *base, int len,
  34                          ptl_ack_req_t ack, struct ptlrpc_cb_id *cbid,
  35                          struct ptlrpc_connection *conn, int portal, __u64 xid)
  36 {
  37         int              rc;
  38         ptl_md_t         md;
  39         char str[PTL_NALFMT_SIZE];
  40         ENTRY;
  41
  42         LASSERT (portal != 0);
  43         LASSERT (conn != NULL);
  44         CDEBUG (D_INFO, "conn=%p ni %s id %s on %s\n",
  45                 conn, conn->c_peer.peer_ni->pni_name,
  46                 ptlrpc_id2str(&conn->c_peer, str),
  47                 conn->c_peer.peer_ni->pni_name);
  48         md.start     = base;
  49         md.length    = len;
  50         md.threshold = (ack == PTL_ACK_REQ) ? 2 : 1;
  51         md.options   = PTLRPC_MD_OPTIONS;
  52         md.user_ptr  = cbid;
  53         md.eq_handle = conn->c_peer.peer_ni->pni_eq_h;
  54
  55         if (ack == PTL_ACK_REQ &&
  56             OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_ACK | OBD_FAIL_ONCE)) {
  57                 /* don't ask for the ack to simulate failing client */
  58                 ack = PTL_NOACK_REQ;
  59                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
  60         }
  61
  62         rc = PtlMDBind (conn->c_peer.peer_ni->pni_ni_h, md,
  63                         PTL_UNLINK, mdh);
  64         if (rc != PTL_OK) {
  65                 CERROR ("PtlMDBind failed: %d\n", rc);
  66                 LASSERT (rc == PTL_NO_SPACE);
  67                 RETURN (-ENOMEM);
  68         }
  69
  70         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid "LPD64"\n",
  71                len, portal, xid);
  72
  73         rc = PtlPut (*mdh, ack, conn->c_peer.peer_id, portal, 0, xid, 0, 0);
  74         if (rc != PTL_OK) {
  75                 int rc2;
  76                 /* We're going to get an UNLINK event when I unlink below,
  77                  * which will complete just like any other failed send, so
  78                  * I fall through and return success here! */
  79                 CERROR("PtlPut(%s, %d, "LPD64") failed: %d\n",
  80                        ptlrpc_id2str(&conn->c_peer, str),
  81                        portal, xid, rc);
  82                 rc2 = PtlMDUnlink(*mdh);
  83                 LASSERTF(rc2 == PTL_OK, "rc2 = %d\n", rc2);
  84         }
  85
  86         RETURN (0);
  87 }
  88
  89 int ptlrpc_start_bulk_transfer (struct ptlrpc_bulk_desc *desc)
  90 {
  91         int                 rc;
  92         int                 rc2;
  93         struct ptlrpc_peer *peer;
  94         ptl_md_t            md;
  95         __u64               xid;
  96         char                str[PTL_NALFMT_SIZE];
  97         ENTRY;
  98
  99         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_BULK_PUT_NET))
 100                 RETURN(0);
 101
 102         /* NB no locking required until desc is on the network */
 103         LASSERT (!desc->bd_network_rw);
 104         LASSERT (desc->bd_type == BULK_PUT_SOURCE ||
 105                  desc->bd_type == BULK_GET_SINK);
 106         desc->bd_success = 0;
 107         peer = &desc->bd_export->exp_connection->c_peer;
 108
 109         md.user_ptr = &desc->bd_cbid;
 110         md.eq_handle = peer->peer_ni->pni_eq_h;
 111         md.threshold = 2; /* SENT and ACK/REPLY */
 112         md.options = PTLRPC_MD_OPTIONS;
 113         ptlrpc_fill_bulk_md(&md, desc);
 114
 115         LASSERT (desc->bd_cbid.cbid_fn == server_bulk_callback);
 116         LASSERT (desc->bd_cbid.cbid_arg == desc);
 117
 118         /* NB total length may be 0 for a read past EOF, so we send a 0
 119          * length bulk, since the client expects a bulk event. */
 120
 121         rc = PtlMDBind(peer->peer_ni->pni_ni_h, md,
 122                        PTL_UNLINK, &desc->bd_md_h);
 123         if (rc != PTL_OK) {
 124                 CERROR("PtlMDBind failed: %d\n", rc);
 125                 LASSERT (rc == PTL_NO_SPACE);
 126                 RETURN(-ENOMEM);
 127         }
 128
 129         /* Client's bulk and reply matchbits are the same */
 130         xid = desc->bd_req->rq_xid;
 131         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d on %s "
 132                "nid %s pid %d xid "LPX64"\n", desc->bd_iov_count,
 133                desc->bd_nob, desc->bd_portal, peer->peer_ni->pni_name,
 134                ptlrpc_id2str(peer, str), peer->peer_id.pid, xid);
 135
 136         /* Network is about to get at the memory */
 137         desc->bd_network_rw = 1;
 138
 139         if (desc->bd_type == BULK_PUT_SOURCE)
 140                 rc = PtlPut (desc->bd_md_h, PTL_ACK_REQ, peer->peer_id,
 141                              desc->bd_portal, 0, xid, 0, 0);
 142         else
 143                 rc = PtlGet (desc->bd_md_h, peer->peer_id,
 144                              desc->bd_portal, 0, xid, 0);
 145
 146         if (rc != PTL_OK) {
 147                 /* Can't send, so we unlink the MD bound above.  The UNLINK
 148                  * event this creates will signal completion with failure,
 149                  * so we return SUCCESS here! */
 150                 CERROR("Transfer(%s, %d, "LPX64") failed: %d\n",
 151                        ptlrpc_id2str(peer, str),
 152                        desc->bd_portal, xid, rc);
 153                 rc2 = PtlMDUnlink(desc->bd_md_h);
 154                 LASSERT (rc2 == PTL_OK);
 155         }
 156
 157         RETURN(0);
 158 }
 159
 160 void ptlrpc_abort_bulk (struct ptlrpc_bulk_desc *desc)
 161 {
 162         /* Server side bulk abort. Idempotent. Not thread-safe (i.e. only
 163          * serialises with completion callback) */
 164         struct l_wait_info lwi;
 165         int                rc;
 166
 167         LASSERT (!in_interrupt ());             /* might sleep */
 168
 169         if (!ptlrpc_bulk_active(desc))          /* completed or */
 170                 return;                         /* never started */
 171
 172         /* The unlink ensures the callback happens ASAP and is the last
 173          * one.  If it fails, it must be because completion just happened,
 174          * but we must still l_wait_event() in this case, to give liblustre
 175          * a chance to run server_bulk_callback()*/
 176
 177         PtlMDUnlink (desc->bd_md_h);
 178
 179         for (;;) {
 180                 /* Network access will complete in finite time but the HUGE
 181                  * timeout lets us CWARN for visibility of sluggish NALs */
 182                 lwi = LWI_TIMEOUT (300 * HZ, NULL, NULL);
 183                 rc = l_wait_event(desc->bd_waitq,
 184                                   !ptlrpc_bulk_active(desc), &lwi);
 185                 if (rc == 0)
 186                         return;
 187
 188                 LASSERT(rc == -ETIMEDOUT);
 189                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 190         }
 191 }
 192
 193 int ptlrpc_register_bulk (struct ptlrpc_request *req)
 194 {
 195         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 196         struct ptlrpc_peer *peer;
 197         int rc;
 198         int rc2;
 199         ptl_handle_me_t  me_h;
 200         ptl_md_t         md;
 201         ENTRY;
 202
 203         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_BULK_GET_NET))
 204                 RETURN(0);
 205
 206         /* NB no locking required until desc is on the network */
 207         LASSERT (desc->bd_nob > 0);
 208         LASSERT (!desc->bd_network_rw);
 209         LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
 210         LASSERT (desc->bd_req != NULL);
 211         LASSERT (desc->bd_type == BULK_PUT_SINK ||
 212                  desc->bd_type == BULK_GET_SOURCE);
 213
 214         desc->bd_success = 0;
 215
 216         peer = &desc->bd_import->imp_connection->c_peer;
 217
 218         md.user_ptr = &desc->bd_cbid;
 219         md.eq_handle = peer->peer_ni->pni_eq_h;
 220         md.threshold = 1;                       /* PUT or GET */
 221         md.options = PTLRPC_MD_OPTIONS |
 222                      ((desc->bd_type == BULK_GET_SOURCE) ?
 223                       PTL_MD_OP_GET : PTL_MD_OP_PUT);
 224         ptlrpc_fill_bulk_md(&md, desc);
 225
 226         LASSERT (desc->bd_cbid.cbid_fn == client_bulk_callback);
 227         LASSERT (desc->bd_cbid.cbid_arg == desc);
 228
 229         /* XXX Registering the same xid on retried bulk makes my head
 230          * explode trying to understand how the original request's bulk
 231          * might interfere with the retried request -eeb */
 232         LASSERTF (!desc->bd_registered || req->rq_xid != desc->bd_last_xid,
 233                   "registered: %d  rq_xid: "LPU64" bd_last_xid: "LPU64"\n",
 234                   desc->bd_registered, req->rq_xid, desc->bd_last_xid);
 235         desc->bd_registered = 1;
 236         desc->bd_last_xid = req->rq_xid;
 237
 238         rc = PtlMEAttach(peer->peer_ni->pni_ni_h, desc->bd_portal,
 239                          desc->bd_import->imp_connection->c_peer.peer_id,
 240                          req->rq_xid, 0, PTL_UNLINK, PTL_INS_AFTER, &me_h);
 241         if (rc != PTL_OK) {
 242                 CERROR("PtlMEAttach failed: %d\n", rc);
 243                 LASSERT (rc == PTL_NO_SPACE);
 244                 RETURN (-ENOMEM);
 245         }
 246
 247         /* About to let the network at it... */
 248         desc->bd_network_rw = 1;
 249         rc = PtlMDAttach(me_h, md, PTL_UNLINK, &desc->bd_md_h);
 250         if (rc != PTL_OK) {
 251                 CERROR("PtlMDAttach failed: %d\n", rc);
 252                 LASSERT (rc == PTL_NO_SPACE);
 253                 desc->bd_network_rw = 0;
 254                 rc2 = PtlMEUnlink (me_h);
 255                 LASSERT (rc2 == PTL_OK);
 256                 RETURN (-ENOMEM);
 257         }
 258
 259         CDEBUG(D_NET, "Setup bulk %s buffers: %u pages %u bytes, xid "LPX64", "
 260                "portal %u on %s\n",
 261                desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
 262                desc->bd_iov_count, desc->bd_nob,
 263                req->rq_xid, desc->bd_portal, peer->peer_ni->pni_name);
 264         RETURN(0);
 265 }
 266
 267 void ptlrpc_unregister_bulk (struct ptlrpc_request *req)
 268 {
 269         /* Disconnect a bulk desc from the network. Idempotent. Not
 270          * thread-safe (i.e. only interlocks with completion callback). */
 271         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 272         wait_queue_head_t       *wq;
 273         struct l_wait_info       lwi;
 274         int                      rc;
 275
 276         LASSERT (!in_interrupt ());     /* might sleep */
 277
 278         if (!ptlrpc_bulk_active(desc))  /* completed or */
 279                 return;                 /* never registered */
 280
 281         LASSERT (desc->bd_req == req);  /* bd_req NULL until registered */
 282
 283         /* the unlink ensures the callback happens ASAP and is the last
 284          * one.  If it fails, it must be because completion just happened,
 285          * but we must still l_wait_event() in this case to give liblustre
 286          * a chance to run client_bulk_callback() */
 287
 288         PtlMDUnlink (desc->bd_md_h);
 289
 290         if (req->rq_set != NULL)
 291                 wq = &req->rq_set->set_waitq;
 292         else
 293                 wq = &req->rq_reply_waitq;
 294
 295         for (;;) {
 296                 /* Network access will complete in finite time but the HUGE
 297                  * timeout lets us CWARN for visibility of sluggish NALs */
 298                 lwi = LWI_TIMEOUT (300 * HZ, NULL, NULL);
 299                 rc = l_wait_event(*wq, !ptlrpc_bulk_active(desc), &lwi);
 300                 if (rc == 0)
 301                         return;
 302
 303                 LASSERT (rc == -ETIMEDOUT);
 304                 DEBUG_REQ(D_WARNING,req,"Unexpectedly long timeout: desc %p\n",
 305                           desc);
 306         }
 307 }
 308
 309 int ptlrpc_send_reply (struct ptlrpc_request *req, int may_be_difficult)
 310 {
 311         struct ptlrpc_service     *svc = req->rq_rqbd->rqbd_srv_ni->sni_service;
 312         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 313         struct ptlrpc_connection  *conn;
 314         int                        rc;
 315
 316         /* We must already have a reply buffer (only ptlrpc_error() may be
 317          * called without one).  We must also have a request buffer which
 318          * is either the actual (swabbed) incoming request, or a saved copy
 319          * if this is a req saved in target_queue_final_reply(). */
 320         LASSERT (req->rq_reqmsg != NULL);
 321         LASSERT (rs != NULL);
 322         LASSERT (req->rq_repmsg != NULL);
 323         LASSERT (may_be_difficult || !rs->rs_difficult);
 324         LASSERT (req->rq_repmsg == &rs->rs_msg);
 325         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
 326         LASSERT (rs->rs_cb_id.cbid_arg == rs);
 327         LASSERT (req->rq_repmsg != NULL);
 328
 329         if (req->rq_export && req->rq_export->exp_obd &&
 330             req->rq_export->exp_obd->obd_fail) {
 331                 /* Failed obd's only send ENODEV */
 332                 req->rq_type = PTL_RPC_MSG_ERR;
 333                 req->rq_status = -ENODEV;
 334                 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
 335                        req->rq_export->exp_obd->obd_minor);
 336         }
 337
 338         if (req->rq_type != PTL_RPC_MSG_ERR)
 339                 req->rq_type = PTL_RPC_MSG_REPLY;
 340
 341         req->rq_repmsg->type   = req->rq_type;
 342         req->rq_repmsg->status = req->rq_status;
 343         req->rq_repmsg->opc    = req->rq_reqmsg->opc;
 344
 345         if (req->rq_export == NULL)
 346                 conn = ptlrpc_get_connection(&req->rq_peer, NULL);
 347         else
 348                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
 349
 350         atomic_inc (&svc->srv_outstanding_replies);
 351         ptlrpc_rs_addref(rs);                   /* +1 ref for the network */
 352
 353         rc = ptl_send_buf (&rs->rs_md_h, req->rq_repmsg, req->rq_replen,
 354                            rs->rs_difficult ? PTL_ACK_REQ : PTL_NOACK_REQ,
 355                            &rs->rs_cb_id, conn,
 356                            svc->srv_rep_portal, req->rq_xid);
 357         if (rc != 0) {
 358                 atomic_dec (&svc->srv_outstanding_replies);
 359                 ptlrpc_rs_decref(rs);
 360         }
 361         ptlrpc_put_connection(conn);
 362         return rc;
 363 }
 364
 365 int ptlrpc_reply (struct ptlrpc_request *req)
 366 {
 367         return (ptlrpc_send_reply (req, 0));
 368 }
 369
 370 int ptlrpc_error(struct ptlrpc_request *req)
 371 {
 372         int rc;
 373         ENTRY;
 374
 375         if (!req->rq_repmsg) {
 376                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 377                 if (rc)
 378                         RETURN(rc);
 379         }
 380
 381         req->rq_type = PTL_RPC_MSG_ERR;
 382
 383         rc = ptlrpc_send_reply (req, 0);
 384         RETURN(rc);
 385 }
 386
 387 int ptl_send_rpc(struct ptlrpc_request *request)
 388 {
 389         int rc;
 390         int rc2;
 391         struct ptlrpc_connection *connection;
 392         unsigned long flags;
 393         ptl_handle_me_t  reply_me_h;
 394         ptl_md_t         reply_md;
 395         ENTRY;
 396
 397         OBD_FAIL_RETURN(OBD_FAIL_PTLRPC_DROP_RPC, 0);
 398
 399         LASSERT (request->rq_type == PTL_RPC_MSG_REQUEST);
 400
 401         /* If this is a re-transmit, we're required to have disengaged
 402          * cleanly from the previous attempt */
 403         LASSERT (!request->rq_receiving_reply);
 404
 405         if (request->rq_import->imp_obd &&
 406             request->rq_import->imp_obd->obd_fail) {
 407                 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
 408                        request->rq_import->imp_obd->obd_name);
 409                 /* this prevents us from waiting in ptlrpc_queue_wait */
 410                 request->rq_err = 1;
 411                 RETURN(-ENODEV);
 412         }
 413
 414         connection = request->rq_import->imp_connection;
 415
 416         if (request->rq_bulk != NULL) {
 417                 rc = ptlrpc_register_bulk (request);
 418                 if (rc != 0)
 419                         RETURN(rc);
 420         }
 421
 422         request->rq_reqmsg->handle = request->rq_import->imp_remote_handle;
 423         request->rq_reqmsg->type = PTL_RPC_MSG_REQUEST;
 424         request->rq_reqmsg->conn_cnt = request->rq_import->imp_conn_cnt;
 425
 426         LASSERT (request->rq_replen != 0);
 427         if (request->rq_repmsg == NULL)
 428                 OBD_ALLOC(request->rq_repmsg, request->rq_replen);
 429         if (request->rq_repmsg == NULL)
 430                 GOTO(cleanup_bulk, rc = -ENOMEM);
 431
 432         rc = PtlMEAttach(connection->c_peer.peer_ni->pni_ni_h,
 433                          request->rq_reply_portal, /* XXX FIXME bug 249 */
 434                          connection->c_peer.peer_id, request->rq_xid, 0,
 435                          PTL_UNLINK, PTL_INS_AFTER, &reply_me_h);
 436         if (rc != PTL_OK) {
 437                 CERROR("PtlMEAttach failed: %d\n", rc);
 438                 LASSERT (rc == PTL_NO_SPACE);
 439                 GOTO(cleanup_repmsg, rc = -ENOMEM);
 440         }
 441
 442         spin_lock_irqsave (&request->rq_lock, flags);
 443         /* If the MD attach succeeds, there _will_ be a reply_in callback */
 444         request->rq_receiving_reply = 1;
 445         /* Clear any flags that may be present from previous sends. */
 446         request->rq_replied = 0;
 447         request->rq_err = 0;
 448         request->rq_timedout = 0;
 449         request->rq_net_err = 0;
 450         request->rq_resend = 0;
 451         request->rq_restart = 0;
 452         spin_unlock_irqrestore (&request->rq_lock, flags);
 453
 454         reply_md.start     = request->rq_repmsg;
 455         reply_md.length    = request->rq_replen;
 456         reply_md.threshold = 1;
 457         reply_md.options   = PTLRPC_MD_OPTIONS | PTL_MD_OP_PUT;
 458         reply_md.user_ptr  = &request->rq_reply_cbid;
 459         reply_md.eq_handle = connection->c_peer.peer_ni->pni_eq_h;
 460
 461         rc = PtlMDAttach(reply_me_h, reply_md, PTL_UNLINK,
 462                          &request->rq_reply_md_h);
 463         if (rc != PTL_OK) {
 464                 CERROR("PtlMDAttach failed: %d\n", rc);
 465                 LASSERT (rc == PTL_NO_SPACE);
 466                 spin_lock_irqsave (&request->rq_lock, flags);
 467                 /* ...but the MD attach didn't succeed... */
 468                 request->rq_receiving_reply = 0;
 469                 spin_unlock_irqrestore (&request->rq_lock, flags);
 470                 GOTO(cleanup_me, rc -ENOMEM);
 471         }
 472
 473         CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid "LPU64
 474                ", portal %u on %s\n",
 475                request->rq_replen, request->rq_xid,
 476                request->rq_reply_portal,
 477                connection->c_peer.peer_ni->pni_name);
 478
 479         ptlrpc_request_addref(request);       /* +1 ref for the SENT callback */
 480
 481         request->rq_sent = CURRENT_SECONDS;
 482         ptlrpc_pinger_sending_on_import(request->rq_import);
 483         rc = ptl_send_buf(&request->rq_req_md_h,
 484                           request->rq_reqmsg, request->rq_reqlen,
 485                           PTL_NOACK_REQ, &request->rq_req_cbid,
 486                           connection,
 487                           request->rq_request_portal,
 488                           request->rq_xid);
 489         if (rc == 0) {
 490                 ptlrpc_lprocfs_rpc_sent(request);
 491                 RETURN(rc);
 492         }
 493
 494         ptlrpc_req_finished (request);          /* drop callback ref */
 495
 496  cleanup_me:
 497         /* MEUnlink is safe; the PUT didn't even get off the ground, and
 498          * nobody apart from the PUT's target has the right nid+XID to
 499          * access the reply buffer. */
 500         rc2 = PtlMEUnlink(reply_me_h);
 501         LASSERT (rc2 == PTL_OK);
 502         /* UNLINKED callback called synchronously */
 503         LASSERT (!request->rq_receiving_reply);
 504
 505  cleanup_repmsg:
 506         OBD_FREE(request->rq_repmsg, request->rq_replen);
 507         request->rq_repmsg = NULL;
 508
 509  cleanup_bulk:
 510         if (request->rq_bulk != NULL)
 511                 ptlrpc_unregister_bulk(request);
 512
 513         return rc;
 514 }
 515
 516 int ptlrpc_register_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
 517 {
 518         struct ptlrpc_srv_ni    *srv_ni = rqbd->rqbd_srv_ni;
 519         struct ptlrpc_service   *service = srv_ni->sni_service;
 520         static ptl_process_id_t  match_id = {PTL_NID_ANY, PTL_PID_ANY};
 521         int                      rc;
 522         ptl_md_t                 md;
 523         ptl_handle_me_t          me_h;
 524
 525         CDEBUG(D_NET, "PtlMEAttach: portal %d on %s\n",
 526                service->srv_req_portal, srv_ni->sni_ni->pni_name);
 527
 528         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_PTLRPC_RQBD))
 529                 return (-ENOMEM);
 530
 531         rc = PtlMEAttach(srv_ni->sni_ni->pni_ni_h, service->srv_req_portal,
 532                          match_id, 0, ~0, PTL_UNLINK, PTL_INS_AFTER, &me_h);
 533         if (rc != PTL_OK) {
 534                 CERROR("PtlMEAttach failed: %d\n", rc);
 535                 return (-ENOMEM);
 536         }
 537
 538         LASSERT(rqbd->rqbd_refcount == 0);
 539         rqbd->rqbd_refcount = 1;
 540
 541         md.start     = rqbd->rqbd_buffer;
 542         md.length    = service->srv_buf_size;
 543         md.max_size  = service->srv_max_req_size;
 544         md.threshold = PTL_MD_THRESH_INF;
 545         md.options   = PTLRPC_MD_OPTIONS | PTL_MD_OP_PUT | PTL_MD_MAX_SIZE;
 546         md.user_ptr  = &rqbd->rqbd_cbid;
 547         md.eq_handle = srv_ni->sni_ni->pni_eq_h;
 548
 549         rc = PtlMDAttach(me_h, md, PTL_UNLINK, &rqbd->rqbd_md_h);
 550         if (rc == PTL_OK)
 551                 return (0);
 552
 553         CERROR("PtlMDAttach failed: %d; \n", rc);
 554         LASSERT (rc == PTL_NO_SPACE);
 555         rc = PtlMEUnlink (me_h);
 556         LASSERT (rc == PTL_OK);
 557         rqbd->rqbd_refcount = 0;
 558
 559         return (-ENOMEM);
 560 }