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 <obd_support.h>
  35 #include <lustre_net.h>
  36 #include <lustre_lib.h>
  37 #include <obd.h>
  38 #include <obd_class.h>
  39 #include "ptlrpc_internal.h"
  40 #include <lnet/lib-lnet.h> /* for CFS_FAIL_PTLRPC_OST_BULK_CB2 */
  41
  42 /**
  43  * Helper function. Sends \a len bytes from \a base at offset \a offset
  44  * over \a conn connection to portal \a portal.
  45  * Returns 0 on success or error code.
  46  */
  47 static int ptl_send_buf(struct lnet_handle_md *mdh, void *base, int len,
  48                         enum lnet_ack_req ack, struct ptlrpc_cb_id *cbid,
  49                         lnet_nid_t self, struct lnet_process_id peer_id,
  50                         int portal, __u64 xid, unsigned int offset,
  51                         struct lnet_handle_md *bulk_cookie)
  52 {
  53         int              rc;
  54         struct lnet_md         md;
  55         ENTRY;
  56
  57         LASSERT (portal != 0);
  58         CDEBUG (D_INFO, "peer_id %s\n", libcfs_id2str(peer_id));
  59         md.start     = base;
  60         md.length    = len;
  61         md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
  62         md.options   = PTLRPC_MD_OPTIONS;
  63         md.user_ptr  = cbid;
  64         md.eq_handle = ptlrpc_eq;
  65         LNetInvalidateMDHandle(&md.bulk_handle);
  66
  67         if (bulk_cookie) {
  68                 md.bulk_handle = *bulk_cookie;
  69                 md.options |= LNET_MD_BULK_HANDLE;
  70         }
  71
  72         if (unlikely(ack == LNET_ACK_REQ &&
  73                      OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
  74                 /* don't ask for the ack to simulate failing client */
  75                 ack = LNET_NOACK_REQ;
  76         }
  77
  78         rc = LNetMDBind (md, LNET_UNLINK, mdh);
  79         if (unlikely(rc != 0)) {
  80                 CERROR ("LNetMDBind failed: %d\n", rc);
  81                 LASSERT (rc == -ENOMEM);
  82                 RETURN (-ENOMEM);
  83         }
  84
  85         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
  86                len, portal, xid, offset);
  87
  88         rc = LNetPut(self, *mdh, ack,
  89                      peer_id, portal, xid, offset, 0);
  90         if (unlikely(rc != 0)) {
  91                 int rc2;
  92                 /* We're going to get an UNLINK event when I unlink below,
  93                  * which will complete just like any other failed send, so
  94                  * I fall through and return success here! */
  95                 CERROR("LNetPut(%s, %d, %lld) failed: %d\n",
  96                        libcfs_id2str(peer_id), portal, xid, rc);
  97                 rc2 = LNetMDUnlink(*mdh);
  98                 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
  99         }
 100
 101         RETURN (0);
 102 }
 103
 104 static void mdunlink_iterate_helper(struct lnet_handle_md *bd_mds, int count)
 105 {
 106         int i;
 107
 108         for (i = 0; i < count; i++)
 109                 LNetMDUnlink(bd_mds[i]);
 110 }
 111
 112 #ifdef HAVE_SERVER_SUPPORT
 113 /**
 114  * Prepare bulk descriptor for specified incoming request \a req that
 115  * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
 116  * the bulk to be sent. Used on server-side after request was already
 117  * received.
 118  * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
 119  * error.
 120  */
 121 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
 122                                               unsigned nfrags, unsigned max_brw,
 123                                               unsigned int type,
 124                                               unsigned portal,
 125                                               const struct ptlrpc_bulk_frag_ops
 126                                                 *ops)
 127 {
 128         struct obd_export *exp = req->rq_export;
 129         struct ptlrpc_bulk_desc *desc;
 130
 131         ENTRY;
 132         LASSERT(ptlrpc_is_bulk_op_active(type));
 133
 134         desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
 135         if (desc == NULL)
 136                 RETURN(NULL);
 137
 138         desc->bd_export = class_export_get(exp);
 139         desc->bd_req = req;
 140
 141         desc->bd_cbid.cbid_fn  = server_bulk_callback;
 142         desc->bd_cbid.cbid_arg = desc;
 143
 144         /* NB we don't assign rq_bulk here; server-side requests are
 145          * re-used, and the handler frees the bulk desc explicitly. */
 146
 147         return desc;
 148 }
 149 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
 150
 151 /**
 152  * Starts bulk transfer for descriptor \a desc on the server.
 153  * Returns 0 on success or error code.
 154  */
 155 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
 156 {
 157         struct obd_export        *exp = desc->bd_export;
 158         lnet_nid_t                self_nid;
 159         struct lnet_process_id    peer_id;
 160         int                       rc = 0;
 161         __u64                     mbits;
 162         int                       posted_md;
 163         int                       total_md;
 164         struct lnet_md                 md;
 165         ENTRY;
 166
 167         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
 168                 RETURN(0);
 169
 170         /* NB no locking required until desc is on the network */
 171         LASSERT(desc->bd_md_count == 0);
 172         LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
 173
 174         LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
 175         LASSERT(desc->bd_cbid.cbid_arg == desc);
 176
 177         /*
 178          * Multi-Rail: get the preferred self and peer NIDs from the
 179          * request, so they are based on the route taken by the
 180          * message.
 181          */
 182         self_nid = desc->bd_req->rq_self;
 183         peer_id = desc->bd_req->rq_source;
 184
 185         /* NB total length may be 0 for a read past EOF, so we send 0
 186          * length bulks, since the client expects bulk events.
 187          *
 188          * The client may not need all of the bulk mbits for the RPC. The RPC
 189          * used the mbits of the highest bulk mbits needed, and the server masks
 190          * off high bits to get bulk count for this RPC. LU-1431 */
 191         mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
 192         total_md = desc->bd_req->rq_mbits - mbits + 1;
 193
 194         desc->bd_md_count = total_md;
 195         desc->bd_failure = 0;
 196
 197         md.user_ptr = &desc->bd_cbid;
 198         md.eq_handle = ptlrpc_eq;
 199         md.threshold = 2; /* SENT and ACK/REPLY */
 200
 201         for (posted_md = 0; posted_md < total_md; mbits++) {
 202                 md.options = PTLRPC_MD_OPTIONS;
 203
 204                 /* NB it's assumed that source and sink buffer frags are
 205                  * page-aligned. Otherwise we'd have to send client bulk
 206                  * sizes over and split server buffer accordingly */
 207                 ptlrpc_fill_bulk_md(&md, desc, posted_md);
 208                 rc = LNetMDBind(md, LNET_UNLINK, &desc->bd_mds[posted_md]);
 209                 if (rc != 0) {
 210                         CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n",
 211                                exp->exp_obd->obd_name, posted_md, rc);
 212                         LASSERT(rc == -ENOMEM);
 213                         if (posted_md == 0) {
 214                                 desc->bd_md_count = 0;
 215                                 RETURN(-ENOMEM);
 216                         }
 217                         break;
 218                 }
 219
 220                 /* sanity.sh 224c: lets skip last md */
 221                 if (posted_md == desc->bd_md_max_brw - 1)
 222                         OBD_FAIL_CHECK_RESET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3,
 223                                              CFS_FAIL_PTLRPC_OST_BULK_CB2);
 224
 225                 /* Network is about to get at the memory */
 226                 if (ptlrpc_is_bulk_put_source(desc->bd_type))
 227                         rc = LNetPut(self_nid, desc->bd_mds[posted_md],
 228                                      LNET_ACK_REQ, peer_id,
 229                                      desc->bd_portal, mbits, 0, 0);
 230                 else
 231                         rc = LNetGet(self_nid, desc->bd_mds[posted_md],
 232                                      peer_id, desc->bd_portal, mbits, 0, false);
 233
 234                 posted_md++;
 235                 if (rc != 0) {
 236                         CERROR("%s: failed bulk transfer with %s:%u x%llu: "
 237                                "rc = %d\n", exp->exp_obd->obd_name,
 238                                libcfs_id2str(peer_id), desc->bd_portal,
 239                                mbits, rc);
 240                         break;
 241                 }
 242         }
 243
 244         if (rc != 0) {
 245                 /* Can't send, so we unlink the MD bound above.  The UNLINK
 246                  * event this creates will signal completion with failure,
 247                  * so we return SUCCESS here! */
 248                 spin_lock(&desc->bd_lock);
 249                 desc->bd_md_count -= total_md - posted_md;
 250                 spin_unlock(&desc->bd_lock);
 251                 LASSERT(desc->bd_md_count >= 0);
 252
 253                 mdunlink_iterate_helper(desc->bd_mds, posted_md);
 254                 RETURN(0);
 255         }
 256
 257         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
 258                "id %s mbits %#llx-%#llx\n", desc->bd_iov_count,
 259                desc->bd_nob, desc->bd_portal, libcfs_id2str(peer_id),
 260                mbits - posted_md, mbits - 1);
 261
 262         RETURN(0);
 263 }
 264
 265 /**
 266  * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
 267  * serialises with completion callback)
 268  */
 269 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
 270 {
 271         LASSERT(!in_interrupt());           /* might sleep */
 272
 273         if (!ptlrpc_server_bulk_active(desc))   /* completed or */
 274                 return;                         /* never started */
 275
 276         /* We used to poison the pages with 0xab here because we did not want to
 277          * send any meaningful data over the wire for evicted clients (bug 9297)
 278          * However, this is no longer safe now that we use the page cache on the
 279          * OSS (bug 20560) */
 280
 281         /* The unlink ensures the callback happens ASAP and is the last
 282          * one.  If it fails, it must be because completion just happened,
 283          * but we must still l_wait_event() in this case, to give liblustre
 284          * a chance to run server_bulk_callback()*/
 285         mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
 286
 287         for (;;) {
 288                 /* Network access will complete in finite time but the HUGE
 289                  * timeout lets us CWARN for visibility of sluggish NALs */
 290                 int seconds = LONG_UNLINK;
 291
 292                 while (seconds > 0 &&
 293                        wait_event_idle_timeout(desc->bd_waitq,
 294                                                !ptlrpc_server_bulk_active(desc),
 295                                                cfs_time_seconds(1)) == 0)
 296                         seconds -= 1;
 297                 if (seconds > 0)
 298                         return;
 299
 300                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
 301         }
 302 }
 303 #endif /* HAVE_SERVER_SUPPORT */
 304
 305 /**
 306  * Register bulk at the sender for later transfer.
 307  * Returns 0 on success or error code.
 308  */
 309 int ptlrpc_register_bulk(struct ptlrpc_request *req)
 310 {
 311         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 312         struct lnet_process_id peer;
 313         int rc = 0;
 314         int posted_md;
 315         int total_md;
 316         __u64 mbits;
 317         struct lnet_me *me;
 318         struct lnet_md md;
 319         ENTRY;
 320
 321         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
 322                 RETURN(0);
 323
 324         /* NB no locking required until desc is on the network */
 325         LASSERT(desc->bd_nob > 0);
 326         LASSERT(desc->bd_md_count == 0);
 327         LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT);
 328         LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
 329         LASSERT(desc->bd_req != NULL);
 330         LASSERT(ptlrpc_is_bulk_op_passive(desc->bd_type));
 331
 332         /* cleanup the state of the bulk for it will be reused */
 333         if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY)
 334                 desc->bd_nob_transferred = 0;
 335         else if (desc->bd_nob_transferred != 0)
 336                 /* If the network failed after an RPC was sent, this condition
 337                  * could happen.  Rather than assert (was here before), return
 338                  * an EIO error. */
 339                 RETURN(-EIO);
 340
 341         desc->bd_failure = 0;
 342
 343         peer = desc->bd_import->imp_connection->c_peer;
 344
 345         LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
 346         LASSERT(desc->bd_cbid.cbid_arg == desc);
 347
 348         total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
 349         /* rq_mbits is matchbits of the final bulk */
 350         mbits = req->rq_mbits - total_md + 1;
 351
 352         LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK),
 353                  "first mbits = x%llu, last mbits = x%llu\n",
 354                  mbits, req->rq_mbits);
 355         LASSERTF(!(desc->bd_registered &&
 356                    req->rq_send_state != LUSTRE_IMP_REPLAY) ||
 357                  mbits != desc->bd_last_mbits,
 358                  "registered: %d  rq_mbits: %llu bd_last_mbits: %llu\n",
 359                  desc->bd_registered, mbits, desc->bd_last_mbits);
 360
 361         desc->bd_registered = 1;
 362         desc->bd_last_mbits = mbits;
 363         desc->bd_md_count = total_md;
 364         md.user_ptr = &desc->bd_cbid;
 365         md.eq_handle = ptlrpc_eq;
 366         md.threshold = 1;                       /* PUT or GET */
 367
 368         for (posted_md = 0; posted_md < total_md; posted_md++, mbits++) {
 369                 md.options = PTLRPC_MD_OPTIONS |
 370                              (ptlrpc_is_bulk_op_get(desc->bd_type) ?
 371                               LNET_MD_OP_GET : LNET_MD_OP_PUT);
 372                 ptlrpc_fill_bulk_md(&md, desc, posted_md);
 373
 374                 if (posted_md > 0 && posted_md + 1 == total_md &&
 375                     OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) {
 376                         rc = -ENOMEM;
 377                 } else {
 378                         me = LNetMEAttach(desc->bd_portal, peer, mbits, 0,
 379                                   LNET_UNLINK, LNET_INS_AFTER);
 380                         rc = PTR_ERR_OR_ZERO(me);
 381                 }
 382                 if (rc != 0) {
 383                         CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
 384                                desc->bd_import->imp_obd->obd_name, mbits,
 385                                posted_md, rc);
 386                         break;
 387                 }
 388
 389                 /* About to let the network at it... */
 390                 rc = LNetMDAttach(me, md, LNET_UNLINK,
 391                                   &desc->bd_mds[posted_md]);
 392                 if (rc != 0) {
 393                         CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
 394                                desc->bd_import->imp_obd->obd_name, mbits,
 395                                posted_md, rc);
 396                         LNetMEUnlink(me);
 397                         break;
 398                 }
 399         }
 400
 401         if (rc != 0) {
 402                 LASSERT(rc == -ENOMEM);
 403                 spin_lock(&desc->bd_lock);
 404                 desc->bd_md_count -= total_md - posted_md;
 405                 spin_unlock(&desc->bd_lock);
 406                 LASSERT(desc->bd_md_count >= 0);
 407                 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
 408                 req->rq_status = -ENOMEM;
 409                 desc->bd_registered = 0;
 410                 RETURN(-ENOMEM);
 411         }
 412
 413         spin_lock(&desc->bd_lock);
 414         /* Holler if peer manages to touch buffers before he knows the mbits */
 415         if (desc->bd_md_count != total_md)
 416                 CWARN("%s: Peer %s touched %d buffers while I registered\n",
 417                       desc->bd_import->imp_obd->obd_name, libcfs_id2str(peer),
 418                       total_md - desc->bd_md_count);
 419         spin_unlock(&desc->bd_lock);
 420
 421         CDEBUG(D_NET, "Setup %u bulk %s buffers: %u pages %u bytes, "
 422                "mbits x%#llx-%#llx, portal %u\n", desc->bd_md_count,
 423                ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
 424                desc->bd_iov_count, desc->bd_nob,
 425                desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
 426
 427         RETURN(0);
 428 }
 429
 430 /**
 431  * Disconnect a bulk desc from the network. Idempotent. Not
 432  * thread-safe (i.e. only interlocks with completion callback).
 433  * Returns 1 on success or 0 if network unregistration failed for whatever
 434  * reason.
 435  */
 436 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
 437 {
 438         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
 439         ENTRY;
 440
 441         LASSERT(!in_interrupt());     /* might sleep */
 442
 443         /* Let's setup deadline for reply unlink. */
 444         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
 445             async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
 446                 req->rq_bulk_deadline = ktime_get_real_seconds() + LONG_UNLINK;
 447
 448         if (ptlrpc_client_bulk_active(req) == 0)        /* completed or */
 449                 RETURN(1);                              /* never registered */
 450
 451         LASSERT(desc->bd_req == req);  /* bd_req NULL until registered */
 452
 453         /* the unlink ensures the callback happens ASAP and is the last
 454          * one.  If it fails, it must be because completion just happened,
 455          * but we must still l_wait_event() in this case to give liblustre
 456          * a chance to run client_bulk_callback() */
 457         mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
 458
 459         if (ptlrpc_client_bulk_active(req) == 0)        /* completed or */
 460                 RETURN(1);                              /* never registered */
 461
 462         /* Move to "Unregistering" phase as bulk was not unlinked yet. */
 463         ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
 464
 465         /* Do not wait for unlink to finish. */
 466         if (async)
 467                 RETURN(0);
 468
 469         for (;;) {
 470                 /* The wq argument is ignored by user-space wait_event macros */
 471                 wait_queue_head_t *wq = (req->rq_set != NULL) ?
 472                                         &req->rq_set->set_waitq :
 473                                         &req->rq_reply_waitq;
 474                 /*
 475                  * Network access will complete in finite time but the HUGE
 476                  * timeout lets us CWARN for visibility of sluggish NALs.
 477                  */
 478                 int seconds = LONG_UNLINK;
 479
 480                 while (seconds > 0 &&
 481                        wait_event_idle_timeout(*wq,
 482                                                !ptlrpc_client_bulk_active(req),
 483                                                cfs_time_seconds(1)) == 0)
 484                         seconds -= 1;
 485                 if (seconds > 0) {
 486                         ptlrpc_rqphase_move(req, req->rq_next_phase);
 487                         RETURN(1);
 488                 }
 489
 490                 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
 491                           desc);
 492         }
 493         RETURN(0);
 494 }
 495
 496 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
 497 {
 498         struct ptlrpc_service_part      *svcpt = req->rq_rqbd->rqbd_svcpt;
 499         struct ptlrpc_service           *svc = svcpt->scp_service;
 500         int service_time = max_t(int, ktime_get_real_seconds() -
 501                                  req->rq_arrival_time.tv_sec, 1);
 502
 503         if (!(flags & PTLRPC_REPLY_EARLY) &&
 504             (req->rq_type != PTL_RPC_MSG_ERR) &&
 505             (req->rq_reqmsg != NULL) &&
 506             !(lustre_msg_get_flags(req->rq_reqmsg) &
 507               (MSG_RESENT | MSG_REPLAY |
 508                MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
 509                 /* early replies, errors and recovery requests don't count
 510                  * toward our service time estimate */
 511                 int oldse = at_measured(&svcpt->scp_at_estimate, service_time);
 512
 513                 if (oldse != 0) {
 514                         DEBUG_REQ(D_ADAPTTO, req,
 515                                   "svc %s changed estimate from %d to %d",
 516                                   svc->srv_name, oldse,
 517                                   at_get(&svcpt->scp_at_estimate));
 518                 }
 519         }
 520         /* Report actual service time for client latency calc */
 521         lustre_msg_set_service_time(req->rq_repmsg, service_time);
 522         /* Report service time estimate for future client reqs, but report 0
 523          * (to be ignored by client) if it's an error reply during recovery.
 524          * b=15815
 525          */
 526         if (req->rq_type == PTL_RPC_MSG_ERR &&
 527             (req->rq_export == NULL ||
 528              req->rq_export->exp_obd->obd_recovering)) {
 529                 lustre_msg_set_timeout(req->rq_repmsg, 0);
 530         } else {
 531                 time64_t timeout;
 532
 533                 if (req->rq_export && req->rq_reqmsg != NULL &&
 534                     (flags & PTLRPC_REPLY_EARLY) &&
 535                     lustre_msg_get_flags(req->rq_reqmsg) &
 536                     (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
 537                         struct obd_device *exp_obd = req->rq_export->exp_obd;
 538
 539                         timeout = ktime_get_real_seconds() -
 540                                   req->rq_arrival_time.tv_sec +
 541                                   min_t(time64_t, at_extra,
 542                                         exp_obd->obd_recovery_timeout / 4);
 543                 } else {
 544                         timeout = at_get(&svcpt->scp_at_estimate);
 545                 }
 546                 lustre_msg_set_timeout(req->rq_repmsg, timeout);
 547         }
 548
 549         if (req->rq_reqmsg &&
 550             !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
 551                 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
 552                        "req_flags=%#x magic=%x/%x len=%d\n",
 553                        flags, lustre_msg_get_flags(req->rq_reqmsg),
 554                        lustre_msg_get_magic(req->rq_reqmsg),
 555                        lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
 556         }
 557 }
 558
 559 /**
 560  * Send request reply from request \a req reply buffer.
 561  * \a flags defines reply types
 562  * Returns 0 on success or error code
 563  */
 564 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
 565 {
 566         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 567         struct ptlrpc_connection  *conn;
 568         int                        rc;
 569
 570         /* We must already have a reply buffer (only ptlrpc_error() may be
 571          * called without one). The reply generated by sptlrpc layer (e.g.
 572          * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
 573          * have a request buffer which is either the actual (swabbed) incoming
 574          * request, or a saved copy if this is a req saved in
 575          * target_queue_final_reply().
 576          */
 577         LASSERT (req->rq_no_reply == 0);
 578         LASSERT (req->rq_reqbuf != NULL);
 579         LASSERT (rs != NULL);
 580         LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
 581         LASSERT (req->rq_repmsg != NULL);
 582         LASSERT (req->rq_repmsg == rs->rs_msg);
 583         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
 584         LASSERT (rs->rs_cb_id.cbid_arg == rs);
 585
 586         /* There may be no rq_export during failover */
 587
 588         if (unlikely(req->rq_export && req->rq_export->exp_obd &&
 589                      req->rq_export->exp_obd->obd_fail)) {
 590                 /* Failed obd's only send ENODEV */
 591                 req->rq_type = PTL_RPC_MSG_ERR;
 592                 req->rq_status = -ENODEV;
 593                 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
 594                        req->rq_export->exp_obd->obd_minor);
 595         }
 596
 597         if (req->rq_type != PTL_RPC_MSG_ERR)
 598                 req->rq_type = PTL_RPC_MSG_REPLY;
 599
 600         lustre_msg_set_type(req->rq_repmsg, req->rq_type);
 601         lustre_msg_set_status(req->rq_repmsg,
 602                               ptlrpc_status_hton(req->rq_status));
 603         lustre_msg_set_opc(req->rq_repmsg,
 604                 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
 605
 606         target_pack_pool_reply(req);
 607
 608         ptlrpc_at_set_reply(req, flags);
 609
 610         if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
 611                 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
 612         else
 613                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
 614
 615         if (unlikely(conn == NULL)) {
 616                 CERROR("not replying on NULL connection\n"); /* bug 9635 */
 617                 return -ENOTCONN;
 618         }
 619         ptlrpc_rs_addref(rs);                   /* +1 ref for the network */
 620
 621         rc = sptlrpc_svc_wrap_reply(req);
 622         if (unlikely(rc))
 623                 goto out;
 624
 625         req->rq_sent = ktime_get_real_seconds();
 626
 627         rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
 628                           (rs->rs_difficult && !rs->rs_no_ack) ?
 629                           LNET_ACK_REQ : LNET_NOACK_REQ,
 630                           &rs->rs_cb_id, req->rq_self, req->rq_source,
 631                           ptlrpc_req2svc(req)->srv_rep_portal,
 632                           req->rq_xid, req->rq_reply_off, NULL);
 633 out:
 634         if (unlikely(rc != 0))
 635                 ptlrpc_req_drop_rs(req);
 636         ptlrpc_connection_put(conn);
 637         return rc;
 638 }
 639
 640 int ptlrpc_reply (struct ptlrpc_request *req)
 641 {
 642         if (req->rq_no_reply)
 643                 return 0;
 644         else
 645                 return (ptlrpc_send_reply(req, 0));
 646 }
 647
 648 /**
 649  * For request \a req send an error reply back. Create empty
 650  * reply buffers if necessary.
 651  */
 652 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
 653 {
 654         int rc;
 655         ENTRY;
 656
 657         if (req->rq_no_reply)
 658                 RETURN(0);
 659
 660         if (!req->rq_repmsg) {
 661                 rc = lustre_pack_reply(req, 1, NULL, NULL);
 662                 if (rc)
 663                         RETURN(rc);
 664         }
 665
 666         if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
 667             req->rq_status != -EPERM && req->rq_status != -ENOENT &&
 668             req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
 669                 req->rq_type = PTL_RPC_MSG_ERR;
 670
 671         rc = ptlrpc_send_reply(req, may_be_difficult);
 672         RETURN(rc);
 673 }
 674
 675 int ptlrpc_error(struct ptlrpc_request *req)
 676 {
 677         return ptlrpc_send_error(req, 0);
 678 }
 679
 680 /**
 681  * Send request \a request.
 682  * if \a noreply is set, don't expect any reply back and don't set up
 683  * reply buffers.
 684  * Returns 0 on success or error code.
 685  */
 686 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
 687 {
 688         int rc;
 689         int mpflag = 0;
 690         struct lnet_handle_md bulk_cookie;
 691         struct ptlrpc_connection *connection;
 692         struct lnet_me *reply_me = NULL;
 693         struct lnet_md reply_md;
 694         struct obd_import *imp = request->rq_import;
 695         struct obd_device *obd = imp->imp_obd;
 696         ENTRY;
 697
 698         LNetInvalidateMDHandle(&bulk_cookie);
 699
 700         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
 701                 RETURN(0);
 702
 703         LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
 704         LASSERT(request->rq_wait_ctx == 0);
 705
 706         /* If this is a re-transmit, we're required to have disengaged
 707          * cleanly from the previous attempt */
 708         LASSERT(!request->rq_receiving_reply);
 709         LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
 710                 (imp->imp_state == LUSTRE_IMP_FULL)));
 711
 712         if (unlikely(obd != NULL && obd->obd_fail)) {
 713                 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
 714                         obd->obd_name);
 715                 /* this prevents us from waiting in ptlrpc_queue_wait */
 716                 spin_lock(&request->rq_lock);
 717                 request->rq_err = 1;
 718                 spin_unlock(&request->rq_lock);
 719                 request->rq_status = -ENODEV;
 720                 RETURN(-ENODEV);
 721         }
 722
 723         connection = imp->imp_connection;
 724
 725         lustre_msg_set_handle(request->rq_reqmsg,
 726                               &imp->imp_remote_handle);
 727         lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
 728         lustre_msg_set_conn_cnt(request->rq_reqmsg,
 729                                 imp->imp_conn_cnt);
 730         lustre_msghdr_set_flags(request->rq_reqmsg,
 731                                 imp->imp_msghdr_flags);
 732
 733         /* If it's the first time to resend the request for EINPROGRESS,
 734          * we need to allocate a new XID (see after_reply()), it's different
 735          * from the resend for reply timeout. */
 736         if (request->rq_nr_resend != 0 &&
 737             list_empty(&request->rq_unreplied_list)) {
 738                 __u64 min_xid = 0;
 739                 /* resend for EINPROGRESS, allocate new xid to avoid reply
 740                  * reconstruction */
 741                 spin_lock(&imp->imp_lock);
 742                 ptlrpc_assign_next_xid_nolock(request);
 743                 min_xid = ptlrpc_known_replied_xid(imp);
 744                 spin_unlock(&imp->imp_lock);
 745
 746                 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
 747                 DEBUG_REQ(D_RPCTRACE, request,
 748                           "Allocating new XID for resend on EINPROGRESS");
 749         }
 750
 751         if (request->rq_bulk != NULL) {
 752                 ptlrpc_set_bulk_mbits(request);
 753                 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
 754         }
 755
 756         if (list_empty(&request->rq_unreplied_list) ||
 757             request->rq_xid <= imp->imp_known_replied_xid) {
 758                 DEBUG_REQ(D_ERROR, request,
 759                           "xid=%llu, replied=%llu, list_empty=%d",
 760                           request->rq_xid, imp->imp_known_replied_xid,
 761                           list_empty(&request->rq_unreplied_list));
 762                 LBUG();
 763         }
 764
 765         /** For enabled AT all request should have AT_SUPPORT in the
 766          * FULL import state when OBD_CONNECT_AT is set */
 767         LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
 768                 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
 769                 !(imp->imp_connect_data.ocd_connect_flags &
 770                 OBD_CONNECT_AT));
 771
 772         if (request->rq_resend) {
 773                 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
 774                 if (request->rq_resend_cb != NULL)
 775                         request->rq_resend_cb(request, &request->rq_async_args);
 776         }
 777         if (request->rq_memalloc)
 778                 mpflag = cfs_memory_pressure_get_and_set();
 779
 780         rc = sptlrpc_cli_wrap_request(request);
 781         if (rc)
 782                 GOTO(out, rc);
 783
 784         /* bulk register should be done after wrap_request() */
 785         if (request->rq_bulk != NULL) {
 786                 rc = ptlrpc_register_bulk (request);
 787                 if (rc != 0)
 788                         GOTO(cleanup_bulk, rc);
 789                 /*
 790                  * All the mds in the request will have the same cpt
 791                  * encoded in the cookie. So we can just get the first
 792                  * one.
 793                  */
 794                 bulk_cookie = request->rq_bulk->bd_mds[0];
 795         }
 796
 797         if (!noreply) {
 798                 LASSERT (request->rq_replen != 0);
 799                 if (request->rq_repbuf == NULL) {
 800                         LASSERT(request->rq_repdata == NULL);
 801                         LASSERT(request->rq_repmsg == NULL);
 802                         rc = sptlrpc_cli_alloc_repbuf(request,
 803                                                       request->rq_replen);
 804                         if (rc) {
 805                                 /* this prevents us from looping in
 806                                  * ptlrpc_queue_wait */
 807                                 spin_lock(&request->rq_lock);
 808                                 request->rq_err = 1;
 809                                 spin_unlock(&request->rq_lock);
 810                                 request->rq_status = rc;
 811                                 GOTO(cleanup_bulk, rc);
 812                         }
 813                 } else {
 814                         request->rq_repdata = NULL;
 815                         request->rq_repmsg = NULL;
 816                 }
 817
 818                 reply_me = LNetMEAttach(request->rq_reply_portal,
 819                                         connection->c_peer, request->rq_xid, 0,
 820                                         LNET_UNLINK, LNET_INS_AFTER);
 821                 if (IS_ERR(reply_me)) {
 822                         rc = PTR_ERR(reply_me);
 823                         CERROR("LNetMEAttach failed: %d\n", rc);
 824                         LASSERT(rc == -ENOMEM);
 825                         GOTO(cleanup_bulk, rc = -ENOMEM);
 826                 }
 827         }
 828
 829         spin_lock(&request->rq_lock);
 830         /* We are responsible for unlinking the reply buffer */
 831         request->rq_reply_unlinked = noreply;
 832         request->rq_receiving_reply = !noreply;
 833         /* Clear any flags that may be present from previous sends. */
 834         request->rq_req_unlinked = 0;
 835         request->rq_replied = 0;
 836         request->rq_err = 0;
 837         request->rq_timedout = 0;
 838         request->rq_net_err = 0;
 839         request->rq_resend = 0;
 840         request->rq_restart = 0;
 841         request->rq_reply_truncated = 0;
 842         spin_unlock(&request->rq_lock);
 843
 844         if (!noreply) {
 845                 reply_md.start     = request->rq_repbuf;
 846                 reply_md.length    = request->rq_repbuf_len;
 847                 /* Allow multiple early replies */
 848                 reply_md.threshold = LNET_MD_THRESH_INF;
 849                 /* Manage remote for early replies */
 850                 reply_md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
 851                         LNET_MD_MANAGE_REMOTE |
 852                         LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
 853                 reply_md.user_ptr  = &request->rq_reply_cbid;
 854                 reply_md.eq_handle = ptlrpc_eq;
 855
 856                 /* We must see the unlink callback to set rq_reply_unlinked,
 857                  * so we can't auto-unlink */
 858                 rc = LNetMDAttach(reply_me, reply_md, LNET_RETAIN,
 859                                   &request->rq_reply_md_h);
 860                 if (rc != 0) {
 861                         CERROR("LNetMDAttach failed: %d\n", rc);
 862                         LASSERT(rc == -ENOMEM);
 863                         spin_lock(&request->rq_lock);
 864                         /* ...but the MD attach didn't succeed... */
 865                         request->rq_receiving_reply = 0;
 866                         spin_unlock(&request->rq_lock);
 867                         GOTO(cleanup_me, rc = -ENOMEM);
 868                 }
 869
 870                 CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid %llu"
 871                        ", portal %u\n",
 872                        request->rq_repbuf_len, request->rq_xid,
 873                        request->rq_reply_portal);
 874         }
 875
 876         /* add references on request for request_out_callback */
 877         ptlrpc_request_addref(request);
 878         if (obd != NULL && obd->obd_svc_stats != NULL)
 879                 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
 880                         atomic_read(&imp->imp_inflight));
 881
 882         OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
 883
 884         request->rq_sent_ns = ktime_get_real();
 885         request->rq_sent = ktime_get_real_seconds();
 886         /* We give the server rq_timeout secs to process the req, and
 887            add the network latency for our local timeout. */
 888         request->rq_deadline = request->rq_sent + request->rq_timeout +
 889                 ptlrpc_at_get_net_latency(request);
 890
 891         ptlrpc_pinger_sending_on_import(imp);
 892
 893         DEBUG_REQ(D_INFO, request, "send flags=%x",
 894                   lustre_msg_get_flags(request->rq_reqmsg));
 895         rc = ptl_send_buf(&request->rq_req_md_h,
 896                           request->rq_reqbuf, request->rq_reqdata_len,
 897                           LNET_NOACK_REQ, &request->rq_req_cbid,
 898                           LNET_NID_ANY, connection->c_peer,
 899                           request->rq_request_portal,
 900                           request->rq_xid, 0, &bulk_cookie);
 901         if (likely(rc == 0))
 902                 GOTO(out, rc);
 903
 904         request->rq_req_unlinked = 1;
 905         ptlrpc_req_finished(request);
 906         if (noreply)
 907                 GOTO(out, rc);
 908
 909  cleanup_me:
 910         /* MEUnlink is safe; the PUT didn't even get off the ground, and
 911          * nobody apart from the PUT's target has the right nid+XID to
 912          * access the reply buffer.
 913          */
 914         LNetMEUnlink(reply_me);
 915         /* UNLINKED callback called synchronously */
 916         LASSERT(!request->rq_receiving_reply);
 917
 918  cleanup_bulk:
 919         /* We do sync unlink here as there was no real transfer here so
 920          * the chance to have long unlink to sluggish net is smaller here. */
 921         ptlrpc_unregister_bulk(request, 0);
 922         if (request->rq_bulk != NULL)
 923                 request->rq_bulk->bd_registered = 0;
 924  out:
 925         if (rc == -ENOMEM) {
 926                 /* set rq_sent so that this request is treated
 927                  * as a delayed send in the upper layers */
 928                 request->rq_sent = ktime_get_real_seconds();
 929         }
 930
 931         if (request->rq_memalloc)
 932                 cfs_memory_pressure_restore(mpflag);
 933
 934         return rc;
 935 }
 936 EXPORT_SYMBOL(ptl_send_rpc);
 937
 938 /**
 939  * Register request buffer descriptor for request receiving.
 940  */
 941 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
 942 {
 943         struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
 944         static struct lnet_process_id match_id = {
 945                 .nid = LNET_NID_ANY,
 946                 .pid = LNET_PID_ANY
 947         };
 948         int rc;
 949         struct lnet_md md;
 950         struct lnet_me *me;
 951
 952         CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
 953                service->srv_req_portal);
 954
 955         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
 956                 return (-ENOMEM);
 957
 958         /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
 959          * which means buffer can only be attached on local CPT, and LND
 960          * threads can find it by grabbing a local lock */
 961         me = LNetMEAttach(service->srv_req_portal,
 962                           match_id, 0, ~0, LNET_UNLINK,
 963                           rqbd->rqbd_svcpt->scp_cpt >= 0 ?
 964                           LNET_INS_LOCAL : LNET_INS_AFTER);
 965         if (IS_ERR(me)) {
 966                 CERROR("LNetMEAttach failed: %ld\n", PTR_ERR(me));
 967                 return -ENOMEM;
 968         }
 969
 970         LASSERT(rqbd->rqbd_refcount == 0);
 971         rqbd->rqbd_refcount = 1;
 972
 973         md.start     = rqbd->rqbd_buffer;
 974         md.length    = service->srv_buf_size;
 975         md.max_size  = service->srv_max_req_size;
 976         md.threshold = LNET_MD_THRESH_INF;
 977         md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
 978         md.user_ptr  = &rqbd->rqbd_cbid;
 979         md.eq_handle = ptlrpc_eq;
 980
 981         rc = LNetMDAttach(me, md, LNET_UNLINK, &rqbd->rqbd_md_h);
 982         if (rc == 0)
 983                 return 0;
 984
 985         CERROR("LNetMDAttach failed: %d;\n", rc);
 986         LASSERT(rc == -ENOMEM);
 987         LNetMEUnlink(me);
 988         LASSERT(rc == 0);
 989         rqbd->rqbd_refcount = 0;
 990
 991         return -ENOMEM;
 992 }