lustre/ptlrpc/niobuf.c

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