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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  */
  34
  35 #define DEBUG_SUBSYSTEM S_RPC
  36 #ifndef __KERNEL__
  37 #include <liblustre.h>
  38 #endif
  39 #include <obd_support.h>
  40 #include <lustre_net.h>
  41 #include <lustre_lib.h>
  42 #include <obd.h>
  43 #include <obd_class.h>
  44 #include "ptlrpc_internal.h"
  45
  46 /**
  47  * Helper function. Sends \a len bytes from \a base at offset \a offset
  48  * over \a conn connection to portal \a portal.
  49  * Returns 0 on success or error code.
  50  */
  51 static int ptl_send_buf (lnet_handle_md_t *mdh, void *base, int len,
  52                          lnet_ack_req_t ack, struct ptlrpc_cb_id *cbid,
  53                          struct ptlrpc_connection *conn, int portal, __u64 xid,
  54                          unsigned int offset)
  55 {
  56         int              rc;
  57         lnet_md_t         md;
  58         ENTRY;
  59
  60         LASSERT (portal != 0);
  61         LASSERT (conn != NULL);
  62         CDEBUG (D_INFO, "conn=%p id %s\n", conn, libcfs_id2str(conn->c_peer));
  63         md.start     = base;
  64         md.length    = len;
  65         md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
  66         md.options   = PTLRPC_MD_OPTIONS;
  67         md.user_ptr  = cbid;
  68         md.eq_handle = ptlrpc_eq_h;
  69
  70         if (unlikely(ack == LNET_ACK_REQ &&
  71                      OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
  72                 /* don't ask for the ack to simulate failing client */
  73                 ack = LNET_NOACK_REQ;
  74         }
  75
  76         rc = LNetMDBind (md, LNET_UNLINK, mdh);
  77         if (unlikely(rc != 0)) {
  78                 CERROR ("LNetMDBind failed: %d\n", rc);
  79                 LASSERT (rc == -ENOMEM);
  80                 RETURN (-ENOMEM);
  81         }
  82
  83         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid "LPD64", offset %u\n",
  84                len, portal, xid, offset);
  85
  86         rc = LNetPut (conn->c_self, *mdh, ack,
  87                       conn->c_peer, portal, xid, offset, 0);
  88         if (unlikely(rc != 0)) {
  89                 int rc2;
  90                 /* We're going to get an UNLINK event when I unlink below,
  91                  * which will complete just like any other failed send, so
  92                  * I fall through and return success here! */
  93                 CERROR("LNetPut(%s, %d, "LPD64") failed: %d\n",
  94                        libcfs_id2str(conn->c_peer), portal, xid, rc);
  95                 rc2 = LNetMDUnlink(*mdh);
  96                 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
  97         }
  98
  99         RETURN (0);
 100 }
 101
 102 #ifdef HAVE_SERVER_SUPPORT
 103 /**
 104  * Prepare bulk descriptor for specified incoming request \a req that
 105  * can fit \a npages * pages. \a type is bulk type. \a portal is where
 106  * the bulk to be sent. Used on server-side after request was already
 107  * received.
 108  * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
 109  * error.
 110  */
 111 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
 112                                               int npages, int type, int portal)
 113 {
 114         struct obd_export *exp = req->rq_export;
 115         struct ptlrpc_bulk_desc *desc;
 116
 117         ENTRY;
 118         LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK);
 119
 120         desc = new_bulk(npages, type, portal);
 121         if (desc == NULL)
 122                 RETURN(NULL);
 123
 124         desc->bd_export = class_export_get(exp);
 125         desc->bd_req = req;
 126
 127         desc->bd_cbid.cbid_fn  = server_bulk_callback;
 128         desc->bd_cbid.cbid_arg = desc;
 129
 130         /* NB we don't assign rq_bulk here; server-side requests are
 131          * re-used, and the handler frees the bulk desc explicitly. */
 132
 133         return desc;
 134 }
 135
 136 /**
 137  * Starts bulk transfer for descriptor \a desc
 138  * Returns 0 on success or error code.
 139  */
 140 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
 141 {
 142         struct ptlrpc_connection *conn = desc->bd_export->exp_connection;
 143         int                       rc;
 144         int                       rc2;
 145         lnet_md_t                 md;
 146         __u64                     xid;
 147         ENTRY;
 148
 149         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
 150                 RETURN(0);
 151
 152         /* NB no locking required until desc is on the network */
 153         LASSERT (!desc->bd_network_rw);
 154         LASSERT (desc->bd_type == BULK_PUT_SOURCE ||
 155                  desc->bd_type == BULK_GET_SINK);
 156         desc->bd_success = 0;
 157
 158         md.user_ptr = &desc->bd_cbid;
 159         md.eq_handle = ptlrpc_eq_h;
 160         md.threshold = 2; /* SENT and ACK/REPLY */
 161         md.options = PTLRPC_MD_OPTIONS;
 162         ptlrpc_fill_bulk_md(&md, desc);
 163
 164         LASSERT (desc->bd_cbid.cbid_fn == server_bulk_callback);
 165         LASSERT (desc->bd_cbid.cbid_arg == desc);
 166
 167         /* NB total length may be 0 for a read past EOF, so we send a 0
 168          * length bulk, since the client expects a bulk event. */
 169
 170         rc = LNetMDBind(md, LNET_UNLINK, &desc->bd_md_h);
 171         if (rc != 0) {
 172                 CERROR("LNetMDBind failed: %d\n", rc);
 173                 LASSERT (rc == -ENOMEM);
 174                 RETURN(-ENOMEM);
 175         }
 176
 177         /* Client's bulk and reply matchbits are the same */
 178         xid = desc->bd_req->rq_xid;
 179         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
 180                "id %s xid "LPX64"\n", desc->bd_iov_count,
 181                desc->bd_nob, desc->bd_portal,
 182                libcfs_id2str(conn->c_peer), xid);
 183
 184         /* Network is about to get at the memory */
 185         desc->bd_network_rw = 1;
 186
 187         if (desc->bd_type == BULK_PUT_SOURCE)
 188                 rc = LNetPut (conn->c_self, desc->bd_md_h, LNET_ACK_REQ,
 189                               conn->c_peer, desc->bd_portal, xid, 0, 0);
 190         else
 191                 rc = LNetGet (conn->c_self, desc->bd_md_h,
 192                               conn->c_peer, desc->bd_portal, xid, 0);
 193
 194         if (rc != 0) {
 195                 /* Can't send, so we unlink the MD bound above.  The UNLINK
 196                  * event this creates will signal completion with failure,
 197                  * so we return SUCCESS here! */
 198                 CERROR("Transfer(%s, %d, "LPX64") failed: %d\n",
 199                        libcfs_id2str(conn->c_peer), desc->bd_portal, xid, rc);
 200                 rc2 = LNetMDUnlink(desc->bd_md_h);
 201                 LASSERT (rc2 == 0);
 202         }
 203
 204         RETURN(0);
 205 }
 206
 207 /**
 208  * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
 209  * serialises with completion callback)
 210  */
 211 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
 212 {
 213         struct l_wait_info       lwi;
 214         int                      rc;
 215
 216         LASSERT(!cfs_in_interrupt());           /* might sleep */
 217
 218         if (!ptlrpc_server_bulk_active(desc))   /* completed or */
 219                 return;                         /* never started */
 220
 221         /* We used to poison the pages with 0xab here because we did not want to
 222          * send any meaningful data over the wire for evicted clients (bug 9297)
 223          * However, this is no longer safe now that we use the page cache on the
 224          * OSS (bug 20560) */
 225
 226         /* The unlink ensures the callback happens ASAP and is the last
 227          * one.  If it fails, it must be because completion just happened,
 228          * but we must still l_wait_event() in this case, to give liblustre
 229          * a chance to run server_bulk_callback()*/
 230
 231         LNetMDUnlink(desc->bd_md_h);
 232
 233         for (;;) {
 234                 /* Network access will complete in finite time but the HUGE
 235                  * timeout lets us CWARN for visibility of sluggish NALs */
 236                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
 237                                            cfs_time_seconds(1), NULL, NULL);
 238                 rc = l_wait_event(desc->bd_waitq,
 239                                   !ptlrpc_server_bulk_active(desc), &lwi);
 240                 if (rc == 0)
 241                         return;
 242
 243                 LASSERT(rc == -ETIMEDOUT);
 244                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 245         }
 246 }
 247 #endif /* HAVE_SERVER_SUPPORT */
 248
 249 /**
 250  * Register bulk for later transfer
 251  * Returns 0 on success or error code.
 252  */
 253 int ptlrpc_register_bulk(struct ptlrpc_request *req)
 254 {
 255         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 256         lnet_process_id_t peer;
 257         int rc;
 258         int rc2;
 259         lnet_handle_me_t  me_h;
 260         lnet_md_t         md;
 261         ENTRY;
 262
 263         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
 264                 RETURN(0);
 265
 266         /* NB no locking required until desc is on the network */
 267         LASSERT (desc->bd_nob > 0);
 268         LASSERT (!desc->bd_network_rw);
 269         LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
 270         LASSERT (desc->bd_req != NULL);
 271         LASSERT (desc->bd_type == BULK_PUT_SINK ||
 272                  desc->bd_type == BULK_GET_SOURCE);
 273
 274         desc->bd_success = 0;
 275
 276         peer = desc->bd_import->imp_connection->c_peer;
 277
 278         md.user_ptr = &desc->bd_cbid;
 279         md.eq_handle = ptlrpc_eq_h;
 280         md.threshold = 1;                       /* PUT or GET */
 281         md.options = PTLRPC_MD_OPTIONS |
 282                      ((desc->bd_type == BULK_GET_SOURCE) ?
 283                       LNET_MD_OP_GET : LNET_MD_OP_PUT);
 284         ptlrpc_fill_bulk_md(&md, desc);
 285
 286         LASSERT (desc->bd_cbid.cbid_fn == client_bulk_callback);
 287         LASSERT (desc->bd_cbid.cbid_arg == desc);
 288
 289         /* XXX Registering the same xid on retried bulk makes my head
 290          * explode trying to understand how the original request's bulk
 291          * might interfere with the retried request -eeb
 292          * On the other hand replaying with the same xid is fine, since
 293          * we are guaranteed old request have completed. -green */
 294         LASSERTF(!(desc->bd_registered &&
 295                  req->rq_send_state != LUSTRE_IMP_REPLAY) ||
 296                  req->rq_xid != desc->bd_last_xid,
 297                  "registered: %d  rq_xid: "LPU64" bd_last_xid: "LPU64"\n",
 298                  desc->bd_registered, req->rq_xid, desc->bd_last_xid);
 299         desc->bd_registered = 1;
 300         desc->bd_last_xid = req->rq_xid;
 301
 302         rc = LNetMEAttach(desc->bd_portal, peer,
 303                          req->rq_xid, 0, LNET_UNLINK, LNET_INS_AFTER, &me_h);
 304         if (rc != 0) {
 305                 CERROR("LNetMEAttach failed: %d\n", rc);
 306                 LASSERT (rc == -ENOMEM);
 307                 RETURN (-ENOMEM);
 308         }
 309
 310         /* About to let the network at it... */
 311         desc->bd_network_rw = 1;
 312         rc = LNetMDAttach(me_h, md, LNET_UNLINK, &desc->bd_md_h);
 313         if (rc != 0) {
 314                 CERROR("LNetMDAttach failed: %d\n", rc);
 315                 LASSERT (rc == -ENOMEM);
 316                 desc->bd_network_rw = 0;
 317                 rc2 = LNetMEUnlink (me_h);
 318                 LASSERT (rc2 == 0);
 319                 RETURN (-ENOMEM);
 320         }
 321
 322         CDEBUG(D_NET, "Setup bulk %s buffers: %u pages %u bytes, xid "LPU64", "
 323                "portal %u\n",
 324                desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
 325                desc->bd_iov_count, desc->bd_nob,
 326                req->rq_xid, desc->bd_portal);
 327         RETURN(0);
 328 }
 329
 330 /**
 331  * Disconnect a bulk desc from the network. Idempotent. Not
 332  * thread-safe (i.e. only interlocks with completion callback).
 333  * Returns 1 on success or 0 if network unregistration failed for whatever
 334  * reason.
 335  */
 336 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
 337 {
 338         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 339         cfs_waitq_t             *wq;
 340         struct l_wait_info       lwi;
 341         int                      rc;
 342         ENTRY;
 343
 344         LASSERT(!cfs_in_interrupt());     /* might sleep */
 345
 346         /* Let's setup deadline for reply unlink. */
 347         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
 348             async && req->rq_bulk_deadline == 0)
 349                 req->rq_bulk_deadline = cfs_time_current_sec() + LONG_UNLINK;
 350
 351         if (!ptlrpc_client_bulk_active(req))  /* completed or */
 352                 RETURN(1);                    /* never registered */
 353
 354         LASSERT(desc->bd_req == req);  /* bd_req NULL until registered */
 355
 356         /* the unlink ensures the callback happens ASAP and is the last
 357          * one.  If it fails, it must be because completion just happened,
 358          * but we must still l_wait_event() in this case to give liblustre
 359          * a chance to run client_bulk_callback() */
 360
 361         LNetMDUnlink(desc->bd_md_h);
 362
 363         if (!ptlrpc_client_bulk_active(req))  /* completed or */
 364                 RETURN(1);                    /* never registered */
 365
 366         /* Move to "Unregistering" phase as bulk was not unlinked yet. */
 367         ptlrpc_rqphase_move(req, RQ_PHASE_UNREGISTERING);
 368
 369         /* Do not wait for unlink to finish. */
 370         if (async)
 371                 RETURN(0);
 372
 373         if (req->rq_set != NULL)
 374                 wq = &req->rq_set->set_waitq;
 375         else
 376                 wq = &req->rq_reply_waitq;
 377
 378         for (;;) {
 379                 /* Network access will complete in finite time but the HUGE
 380                  * timeout lets us CWARN for visibility of sluggish NALs */
 381                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
 382                                            cfs_time_seconds(1), NULL, NULL);
 383                 rc = l_wait_event(*wq, !ptlrpc_client_bulk_active(req), &lwi);
 384                 if (rc == 0) {
 385                         ptlrpc_rqphase_move(req, req->rq_next_phase);
 386                         RETURN(1);
 387                 }
 388
 389                 LASSERT(rc == -ETIMEDOUT);
 390                 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
 391                           desc);
 392         }
 393         RETURN(0);
 394 }
 395
 396 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
 397 {
 398         struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
 399         int service_time = max_t(int, cfs_time_current_sec() -
 400                                  req->rq_arrival_time.tv_sec, 1);
 401
 402         if (!(flags & PTLRPC_REPLY_EARLY) &&
 403             (req->rq_type != PTL_RPC_MSG_ERR) &&
 404             (req->rq_reqmsg != NULL) &&
 405             !(lustre_msg_get_flags(req->rq_reqmsg) &
 406               (MSG_RESENT | MSG_REPLAY |
 407                MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
 408                 /* early replies, errors and recovery requests don't count
 409                  * toward our service time estimate */
 410                 int oldse = at_measured(&svc->srv_at_estimate, service_time);
 411                 if (oldse != 0)
 412                         DEBUG_REQ(D_ADAPTTO, req,
 413                                   "svc %s changed estimate from %d to %d",
 414                                   svc->srv_name, oldse,
 415                                   at_get(&svc->srv_at_estimate));
 416         }
 417         /* Report actual service time for client latency calc */
 418         lustre_msg_set_service_time(req->rq_repmsg, service_time);
 419         /* Report service time estimate for future client reqs, but report 0
 420          * (to be ignored by client) if it's a error reply during recovery.
 421          * (bz15815) */
 422         if (req->rq_type == PTL_RPC_MSG_ERR &&
 423             (req->rq_export == NULL || req->rq_export->exp_obd->obd_recovering))
 424                 lustre_msg_set_timeout(req->rq_repmsg, 0);
 425         else
 426                 lustre_msg_set_timeout(req->rq_repmsg,
 427                                        at_get(&svc->srv_at_estimate));
 428
 429         if (req->rq_reqmsg &&
 430             !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
 431                 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
 432                        "req_flags=%#x magic=%d:%x/%x len=%d\n",
 433                        flags, lustre_msg_get_flags(req->rq_reqmsg),
 434                        lustre_msg_is_v1(req->rq_reqmsg),
 435                        lustre_msg_get_magic(req->rq_reqmsg),
 436                        lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
 437         }
 438 }
 439
 440 /**
 441  * Send request reply from request \a req reply buffer.
 442  * \a flags defines reply types
 443  * Returns 0 on sucess or error code
 444  */
 445 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
 446 {
 447         struct ptlrpc_service     *svc = req->rq_rqbd->rqbd_service;
 448         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 449         struct ptlrpc_connection  *conn;
 450         int                        rc;
 451
 452         /* We must already have a reply buffer (only ptlrpc_error() may be
 453          * called without one). The reply generated by sptlrpc layer (e.g.
 454          * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
 455          * have a request buffer which is either the actual (swabbed) incoming
 456          * request, or a saved copy if this is a req saved in
 457          * target_queue_final_reply().
 458          */
 459         LASSERT (req->rq_no_reply == 0);
 460         LASSERT (req->rq_reqbuf != NULL);
 461         LASSERT (rs != NULL);
 462         LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
 463         LASSERT (req->rq_repmsg != NULL);
 464         LASSERT (req->rq_repmsg == rs->rs_msg);
 465         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
 466         LASSERT (rs->rs_cb_id.cbid_arg == rs);
 467
 468         /* There may be no rq_export during failover */
 469
 470         if (unlikely(req->rq_export && req->rq_export->exp_obd &&
 471                      req->rq_export->exp_obd->obd_fail)) {
 472                 /* Failed obd's only send ENODEV */
 473                 req->rq_type = PTL_RPC_MSG_ERR;
 474                 req->rq_status = -ENODEV;
 475                 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
 476                        req->rq_export->exp_obd->obd_minor);
 477         }
 478
 479         if (req->rq_type != PTL_RPC_MSG_ERR)
 480                 req->rq_type = PTL_RPC_MSG_REPLY;
 481
 482         lustre_msg_set_type(req->rq_repmsg, req->rq_type);
 483         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
 484         lustre_msg_set_opc(req->rq_repmsg,
 485                 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
 486
 487         target_pack_pool_reply(req);
 488
 489         ptlrpc_at_set_reply(req, flags);
 490
 491         if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
 492                 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
 493         else
 494                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
 495
 496         if (unlikely(conn == NULL)) {
 497                 CERROR("not replying on NULL connection\n"); /* bug 9635 */
 498                 return -ENOTCONN;
 499         }
 500         ptlrpc_rs_addref(rs);                   /* +1 ref for the network */
 501
 502         rc = sptlrpc_svc_wrap_reply(req);
 503         if (unlikely(rc))
 504                 goto out;
 505
 506         req->rq_sent = cfs_time_current_sec();
 507
 508         rc = ptl_send_buf (&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
 509                            (rs->rs_difficult && !rs->rs_no_ack) ?
 510                            LNET_ACK_REQ : LNET_NOACK_REQ,
 511                            &rs->rs_cb_id, conn, svc->srv_rep_portal,
 512                            req->rq_xid, req->rq_reply_off);
 513 out:
 514         if (unlikely(rc != 0))
 515                 ptlrpc_req_drop_rs(req);
 516         ptlrpc_connection_put(conn);
 517         return rc;
 518 }
 519
 520 int ptlrpc_reply (struct ptlrpc_request *req)
 521 {
 522         if (req->rq_no_reply)
 523                 return 0;
 524         else
 525                 return (ptlrpc_send_reply(req, 0));
 526 }
 527
 528 /**
 529  * For request \a req send an error reply back. Create empty
 530  * reply buffers if necessary.
 531  */
 532 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
 533 {
 534         int rc;
 535         ENTRY;
 536
 537         if (req->rq_no_reply)
 538                 RETURN(0);
 539
 540         if (!req->rq_repmsg) {
 541                 rc = lustre_pack_reply(req, 1, NULL, NULL);
 542                 if (rc)
 543                         RETURN(rc);
 544         }
 545
 546         req->rq_type = PTL_RPC_MSG_ERR;
 547
 548         rc = ptlrpc_send_reply(req, may_be_difficult);
 549         RETURN(rc);
 550 }
 551
 552 int ptlrpc_error(struct ptlrpc_request *req)
 553 {
 554         return ptlrpc_send_error(req, 0);
 555 }
 556
 557 /**
 558  * Send request \a request.
 559  * if \a noreply is set, don't expect any reply back and don't set up
 560  * reply buffers.
 561  * Returns 0 on success or error code.
 562  */
 563 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
 564 {
 565         int rc;
 566         int rc2;
 567         int mpflag = 0;
 568         struct ptlrpc_connection *connection;
 569         lnet_handle_me_t  reply_me_h;
 570         lnet_md_t         reply_md;
 571         struct obd_device *obd = request->rq_import->imp_obd;
 572         ENTRY;
 573
 574         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
 575                 RETURN(0);
 576
 577         LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
 578         LASSERT(request->rq_wait_ctx == 0);
 579
 580         /* If this is a re-transmit, we're required to have disengaged
 581          * cleanly from the previous attempt */
 582         LASSERT(!request->rq_receiving_reply);
 583
 584         if (request->rq_import->imp_obd &&
 585             request->rq_import->imp_obd->obd_fail) {
 586                 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
 587                        request->rq_import->imp_obd->obd_name);
 588                 /* this prevents us from waiting in ptlrpc_queue_wait */
 589                 request->rq_err = 1;
 590                 request->rq_status = -ENODEV;
 591                 RETURN(-ENODEV);
 592         }
 593
 594         connection = request->rq_import->imp_connection;
 595
 596         lustre_msg_set_handle(request->rq_reqmsg,
 597                               &request->rq_import->imp_remote_handle);
 598         lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
 599         lustre_msg_set_conn_cnt(request->rq_reqmsg,
 600                                 request->rq_import->imp_conn_cnt);
 601         lustre_msghdr_set_flags(request->rq_reqmsg,
 602                                 request->rq_import->imp_msghdr_flags);
 603
 604         if (request->rq_resend)
 605                 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
 606
 607         if (request->rq_memalloc)
 608                 mpflag = cfs_memory_pressure_get_and_set();
 609
 610         rc = sptlrpc_cli_wrap_request(request);
 611         if (rc)
 612                 GOTO(out, rc);
 613
 614         /* bulk register should be done after wrap_request() */
 615         if (request->rq_bulk != NULL) {
 616                 rc = ptlrpc_register_bulk (request);
 617                 if (rc != 0)
 618                         GOTO(out, rc);
 619         }
 620
 621         if (!noreply) {
 622                 LASSERT (request->rq_replen != 0);
 623                 if (request->rq_repbuf == NULL) {
 624                         LASSERT(request->rq_repdata == NULL);
 625                         LASSERT(request->rq_repmsg == NULL);
 626                         rc = sptlrpc_cli_alloc_repbuf(request,
 627                                                       request->rq_replen);
 628                         if (rc) {
 629                                 /* this prevents us from looping in
 630                                  * ptlrpc_queue_wait */
 631                                 request->rq_err = 1;
 632                                 request->rq_status = rc;
 633                                 GOTO(cleanup_bulk, rc);
 634                         }
 635                 } else {
 636                         request->rq_repdata = NULL;
 637                         request->rq_repmsg = NULL;
 638                 }
 639
 640                 rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/
 641                                   connection->c_peer, request->rq_xid, 0,
 642                                   LNET_UNLINK, LNET_INS_AFTER, &reply_me_h);
 643                 if (rc != 0) {
 644                         CERROR("LNetMEAttach failed: %d\n", rc);
 645                         LASSERT (rc == -ENOMEM);
 646                         GOTO(cleanup_bulk, rc = -ENOMEM);
 647                 }
 648         }
 649
 650         cfs_spin_lock(&request->rq_lock);
 651         /* If the MD attach succeeds, there _will_ be a reply_in callback */
 652         request->rq_receiving_reply = !noreply;
 653         /* We are responsible for unlinking the reply buffer */
 654         request->rq_must_unlink = !noreply;
 655         /* Clear any flags that may be present from previous sends. */
 656         request->rq_replied = 0;
 657         request->rq_err = 0;
 658         request->rq_timedout = 0;
 659         request->rq_net_err = 0;
 660         request->rq_resend = 0;
 661         request->rq_restart = 0;
 662         request->rq_reply_truncate = 0;
 663         cfs_spin_unlock(&request->rq_lock);
 664
 665         if (!noreply) {
 666                 reply_md.start     = request->rq_repbuf;
 667                 reply_md.length    = request->rq_repbuf_len;
 668                 /* Allow multiple early replies */
 669                 reply_md.threshold = LNET_MD_THRESH_INF;
 670                 /* Manage remote for early replies */
 671                 reply_md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
 672                         LNET_MD_MANAGE_REMOTE |
 673                         LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
 674                 reply_md.user_ptr  = &request->rq_reply_cbid;
 675                 reply_md.eq_handle = ptlrpc_eq_h;
 676
 677                 /* We must see the unlink callback to unset rq_must_unlink,
 678                    so we can't auto-unlink */
 679                 rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN,
 680                                   &request->rq_reply_md_h);
 681                 if (rc != 0) {
 682                         CERROR("LNetMDAttach failed: %d\n", rc);
 683                         LASSERT (rc == -ENOMEM);
 684                         cfs_spin_lock(&request->rq_lock);
 685                         /* ...but the MD attach didn't succeed... */
 686                         request->rq_receiving_reply = 0;
 687                         cfs_spin_unlock(&request->rq_lock);
 688                         GOTO(cleanup_me, rc = -ENOMEM);
 689                 }
 690
 691                 CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid "LPU64
 692                        ", portal %u\n",
 693                        request->rq_repbuf_len, request->rq_xid,
 694                        request->rq_reply_portal);
 695         }
 696
 697         /* add references on request for request_out_callback */
 698         ptlrpc_request_addref(request);
 699         if (obd->obd_svc_stats != NULL)
 700                 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
 701                         cfs_atomic_read(&request->rq_import->imp_inflight));
 702
 703         OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
 704
 705         cfs_gettimeofday(&request->rq_arrival_time);
 706         request->rq_sent = cfs_time_current_sec();
 707         /* We give the server rq_timeout secs to process the req, and
 708            add the network latency for our local timeout. */
 709         request->rq_deadline = request->rq_sent + request->rq_timeout +
 710                 ptlrpc_at_get_net_latency(request);
 711
 712         ptlrpc_pinger_sending_on_import(request->rq_import);
 713
 714         DEBUG_REQ(D_INFO, request, "send flg=%x",
 715                   lustre_msg_get_flags(request->rq_reqmsg));
 716         rc = ptl_send_buf(&request->rq_req_md_h,
 717                           request->rq_reqbuf, request->rq_reqdata_len,
 718                           LNET_NOACK_REQ, &request->rq_req_cbid,
 719                           connection,
 720                           request->rq_request_portal,
 721                           request->rq_xid, 0);
 722         if (rc == 0)
 723                 GOTO(out, rc);
 724
 725         ptlrpc_req_finished(request);
 726         if (noreply)
 727                 GOTO(out, rc);
 728
 729  cleanup_me:
 730         /* MEUnlink is safe; the PUT didn't even get off the ground, and
 731          * nobody apart from the PUT's target has the right nid+XID to
 732          * access the reply buffer. */
 733         rc2 = LNetMEUnlink(reply_me_h);
 734         LASSERT (rc2 == 0);
 735         /* UNLINKED callback called synchronously */
 736         LASSERT(!request->rq_receiving_reply);
 737
 738  cleanup_bulk:
 739         /* We do sync unlink here as there was no real transfer here so
 740          * the chance to have long unlink to sluggish net is smaller here. */
 741         ptlrpc_unregister_bulk(request, 0);
 742  out:
 743         if (request->rq_memalloc)
 744                 cfs_memory_pressure_restore(mpflag);
 745         return rc;
 746 }
 747
 748 /**
 749  * Register request buffer descriptor for request receiving.
 750  */
 751 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
 752 {
 753         struct ptlrpc_service   *service = rqbd->rqbd_service;
 754         static lnet_process_id_t  match_id = {LNET_NID_ANY, LNET_PID_ANY};
 755         int                      rc;
 756         lnet_md_t                 md;
 757         lnet_handle_me_t          me_h;
 758
 759         CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
 760                service->srv_req_portal);
 761
 762         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
 763                 return (-ENOMEM);
 764
 765         rc = LNetMEAttach(service->srv_req_portal,
 766                           match_id, 0, ~0, LNET_UNLINK, LNET_INS_AFTER, &me_h);
 767         if (rc != 0) {
 768                 CERROR("LNetMEAttach failed: %d\n", rc);
 769                 return (-ENOMEM);
 770         }
 771
 772         LASSERT(rqbd->rqbd_refcount == 0);
 773         rqbd->rqbd_refcount = 1;
 774
 775         md.start     = rqbd->rqbd_buffer;
 776         md.length    = service->srv_buf_size;
 777         md.max_size  = service->srv_max_req_size;
 778         md.threshold = LNET_MD_THRESH_INF;
 779         md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
 780         md.user_ptr  = &rqbd->rqbd_cbid;
 781         md.eq_handle = ptlrpc_eq_h;
 782
 783         rc = LNetMDAttach(me_h, md, LNET_UNLINK, &rqbd->rqbd_md_h);
 784         if (rc == 0)
 785                 return (0);
 786
 787         CERROR("LNetMDAttach failed: %d; \n", rc);
 788         LASSERT (rc == -ENOMEM);
 789         rc = LNetMEUnlink (me_h);
 790         LASSERT (rc == 0);
 791         rqbd->rqbd_refcount = 0;
 792
 793         return (-ENOMEM);
 794 }