4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
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>
39 #include <obd_class.h>
40 #include "ptlrpc_internal.h"
41 #include <lnet/lib-lnet.h> /* for CFS_FAIL_PTLRPC_OST_BULK_CB2 */
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.
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)
58 LASSERT (portal != 0);
59 CDEBUG (D_INFO, "peer_id %s\n", libcfs_id2str(peer_id));
62 md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
63 md.options = PTLRPC_MD_OPTIONS;
65 md.handler = ptlrpc_handler;
66 LNetInvalidateMDHandle(&md.bulk_handle);
69 md.bulk_handle = *bulk_cookie;
70 md.options |= LNET_MD_BULK_HANDLE;
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 */
79 rc = LNetMDBind(&md, LNET_UNLINK, mdh);
80 if (unlikely(rc != 0)) {
81 CERROR ("LNetMDBind failed: %d\n", rc);
82 LASSERT (rc == -ENOMEM);
86 CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
87 len, portal, xid, offset);
89 percpu_ref_get(&ptlrpc_pending);
91 rc = LNetPut(self, *mdh, ack,
92 peer_id, portal, xid, offset, 0);
93 if (unlikely(rc != 0)) {
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);
107 #define mdunlink_iterate_helper(mds, count) \
108 __mdunlink_iterate_helper(mds, count, false)
109 static void __mdunlink_iterate_helper(struct lnet_handle_md *bd_mds,
110 int count, bool discard)
114 for (i = 0; i < count; i++)
115 __LNetMDUnlink(bd_mds[i], discard);
118 #ifdef HAVE_SERVER_SUPPORT
120 * Prepare bulk descriptor for specified incoming request \a req that
121 * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
122 * the bulk to be sent. Used on server-side after request was already
124 * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
127 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
128 unsigned nfrags, unsigned max_brw,
131 const struct ptlrpc_bulk_frag_ops
134 struct obd_export *exp = req->rq_export;
135 struct ptlrpc_bulk_desc *desc;
138 LASSERT(ptlrpc_is_bulk_op_active(type));
140 desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
144 desc->bd_export = class_export_get(exp);
147 desc->bd_cbid.cbid_fn = server_bulk_callback;
148 desc->bd_cbid.cbid_arg = desc;
150 /* NB we don't assign rq_bulk here; server-side requests are
151 * re-used, and the handler frees the bulk desc explicitly. */
155 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
158 * Starts bulk transfer for descriptor \a desc on the server.
159 * Returns 0 on success or error code.
161 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
163 struct obd_export *exp = desc->bd_export;
165 struct lnet_process_id peer_id;
173 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
176 /* NB no locking required until desc is on the network */
177 LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
179 LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
180 LASSERT(desc->bd_cbid.cbid_arg == desc);
183 * Multi-Rail: get the preferred self and peer NIDs from the
184 * request, so they are based on the route taken by the
187 self_nid = desc->bd_req->rq_self;
188 peer_id = desc->bd_req->rq_source;
190 /* NB total length may be 0 for a read past EOF, so we send 0
191 * length bulks, since the client expects bulk events.
193 * The client may not need all of the bulk mbits for the RPC. The RPC
194 * used the mbits of the highest bulk mbits needed, and the server masks
195 * off high bits to get bulk count for this RPC. LU-1431 */
196 mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
197 total_md = desc->bd_req->rq_mbits - mbits + 1;
198 desc->bd_refs = total_md;
199 desc->bd_failure = 0;
201 md.user_ptr = &desc->bd_cbid;
202 md.handler = ptlrpc_handler;
203 md.threshold = 2; /* SENT and ACK/REPLY */
205 for (posted_md = 0; posted_md < total_md; mbits++) {
206 md.options = PTLRPC_MD_OPTIONS;
208 /* NB it's assumed that source and sink buffer frags are
209 * page-aligned. Otherwise we'd have to send client bulk
210 * sizes over and split server buffer accordingly */
211 ptlrpc_fill_bulk_md(&md, desc, posted_md);
212 rc = LNetMDBind(&md, LNET_UNLINK, &desc->bd_mds[posted_md]);
214 CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n",
215 exp->exp_obd->obd_name, posted_md, rc);
216 LASSERT(rc == -ENOMEM);
217 if (posted_md == 0) {
218 desc->bd_md_count = 0;
223 percpu_ref_get(&ptlrpc_pending);
225 /* sanity.sh 224c: lets skip last md */
226 if (posted_md == desc->bd_md_max_brw - 1)
227 OBD_FAIL_CHECK_RESET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3,
228 CFS_FAIL_PTLRPC_OST_BULK_CB2);
230 /* Network is about to get at the memory */
231 if (ptlrpc_is_bulk_put_source(desc->bd_type))
232 rc = LNetPut(self_nid, desc->bd_mds[posted_md],
233 LNET_ACK_REQ, peer_id,
234 desc->bd_portal, mbits, 0, 0);
236 rc = LNetGet(self_nid, desc->bd_mds[posted_md],
237 peer_id, desc->bd_portal, mbits, 0, false);
241 CERROR("%s: failed bulk transfer with %s:%u x%llu: "
242 "rc = %d\n", exp->exp_obd->obd_name,
243 libcfs_id2str(peer_id), desc->bd_portal,
250 /* Can't send, so we unlink the MD bound above. The UNLINK
251 * event this creates will signal completion with failure,
252 * so we return SUCCESS here! */
253 spin_lock(&desc->bd_lock);
254 desc->bd_refs -= total_md - posted_md;
255 spin_unlock(&desc->bd_lock);
256 LASSERT(desc->bd_refs >= 0);
258 mdunlink_iterate_helper(desc->bd_mds, posted_md);
262 CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
263 "id %s mbits %#llx-%#llx\n", desc->bd_iov_count,
264 desc->bd_nob, desc->bd_portal, libcfs_id2str(peer_id),
265 mbits - posted_md, mbits - 1);
271 * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
272 * serialises with completion callback)
274 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
276 LASSERT(!in_interrupt()); /* might sleep */
278 if (!ptlrpc_server_bulk_active(desc)) /* completed or */
279 return; /* never started */
281 /* We used to poison the pages with 0xab here because we did not want to
282 * send any meaningful data over the wire for evicted clients (bug 9297)
283 * However, this is no longer safe now that we use the page cache on the
286 /* The unlink ensures the callback happens ASAP and is the last
287 * one. If it fails, it must be because completion just happened,
288 * but we must still wait_event_idle_timeout() in this case, to give
289 * us a chance to run server_bulk_callback()
291 __mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw, true);
294 /* Network access will complete in finite time but the HUGE
295 * timeout lets us CWARN for visibility of sluggish NALs */
296 int seconds = PTLRPC_REQ_LONG_UNLINK;
298 while (seconds > 0 &&
299 wait_event_idle_timeout(desc->bd_waitq,
300 !ptlrpc_server_bulk_active(desc),
301 cfs_time_seconds(1)) == 0)
306 CWARN("Unexpectedly long timeout: desc %p\n", desc);
309 #endif /* HAVE_SERVER_SUPPORT */
312 * Register bulk at the sender for later transfer.
313 * Returns 0 on success or error code.
315 int ptlrpc_register_bulk(struct ptlrpc_request *req)
317 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
318 struct lnet_process_id peer;
327 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
330 /* NB no locking required until desc is on the network */
331 LASSERT(desc->bd_nob > 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));
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
346 desc->bd_failure = 0;
348 peer = desc->bd_import->imp_connection->c_peer;
350 LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
351 LASSERT(desc->bd_cbid.cbid_arg == desc);
353 total_md = desc->bd_md_count;
354 /* rq_mbits is matchbits of the final bulk */
355 mbits = req->rq_mbits - desc->bd_md_count + 1;
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);
366 desc->bd_registered = 1;
367 desc->bd_last_mbits = mbits;
368 desc->bd_refs = total_md;
369 md.user_ptr = &desc->bd_cbid;
370 md.handler = ptlrpc_handler;
371 md.threshold = 1; /* PUT or GET */
373 for (posted_md = 0; posted_md < desc->bd_md_count;
374 posted_md++, mbits++) {
375 md.options = PTLRPC_MD_OPTIONS |
376 (ptlrpc_is_bulk_op_get(desc->bd_type) ?
377 LNET_MD_OP_GET : LNET_MD_OP_PUT);
378 ptlrpc_fill_bulk_md(&md, desc, posted_md);
380 if (posted_md > 0 && posted_md + 1 == desc->bd_md_count &&
381 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) {
384 me = LNetMEAttach(desc->bd_portal, peer, mbits, 0,
385 LNET_UNLINK, LNET_INS_AFTER);
386 rc = PTR_ERR_OR_ZERO(me);
389 CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
390 desc->bd_import->imp_obd->obd_name, mbits,
394 percpu_ref_get(&ptlrpc_pending);
396 /* About to let the network at it... */
397 rc = LNetMDAttach(me, &md, LNET_UNLINK,
398 &desc->bd_mds[posted_md]);
400 CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
401 desc->bd_import->imp_obd->obd_name, mbits,
408 LASSERT(rc == -ENOMEM);
409 spin_lock(&desc->bd_lock);
410 desc->bd_refs -= total_md - posted_md;
411 spin_unlock(&desc->bd_lock);
412 LASSERT(desc->bd_refs >= 0);
413 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
414 req->rq_status = -ENOMEM;
415 desc->bd_registered = 0;
419 spin_lock(&desc->bd_lock);
420 /* Holler if peer manages to touch buffers before he knows the mbits */
421 if (desc->bd_refs != 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_refs);
425 spin_unlock(&desc->bd_lock);
428 "Setup %u bulk %s buffers: %u pages %u bytes, mbits x%#llx-%#llx, portal %u\n",
430 ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
431 desc->bd_iov_count, desc->bd_nob,
432 desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
438 * Disconnect a bulk desc from the network. Idempotent. Not
439 * thread-safe (i.e. only interlocks with completion callback).
440 * Returns 1 on success or 0 if network unregistration failed for whatever
443 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
445 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
448 LASSERT(!in_interrupt()); /* might sleep */
451 desc->bd_registered = 0;
453 /* Let's setup deadline for reply unlink. */
454 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
455 async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
456 req->rq_bulk_deadline = ktime_get_real_seconds() +
457 PTLRPC_REQ_LONG_UNLINK;
459 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
460 RETURN(1); /* never registered */
462 LASSERT(desc->bd_req == req); /* bd_req NULL until registered */
464 /* the unlink ensures the callback happens ASAP and is the last
465 * one. If it fails, it must be because completion just happened,
466 * but we must still wait_event_idle_timeout() in this case to give
467 * us a chance to run client_bulk_callback()
469 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
471 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
472 RETURN(1); /* never registered */
474 /* Move to "Unregistering" phase as bulk was not unlinked yet. */
475 ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
477 /* Do not wait for unlink to finish. */
482 /* The wq argument is ignored by user-space wait_event macros */
483 wait_queue_head_t *wq = (req->rq_set != NULL) ?
484 &req->rq_set->set_waitq :
485 &req->rq_reply_waitq;
487 * Network access will complete in finite time but the HUGE
488 * timeout lets us CWARN for visibility of sluggish NALs.
490 int seconds = PTLRPC_REQ_LONG_UNLINK;
492 while (seconds > 0 &&
493 wait_event_idle_timeout(*wq,
494 !ptlrpc_client_bulk_active(req),
495 cfs_time_seconds(1)) == 0)
498 ptlrpc_rqphase_move(req, req->rq_next_phase);
502 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
508 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
510 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
511 struct ptlrpc_service *svc = svcpt->scp_service;
512 timeout_t service_timeout;
514 service_timeout = clamp_t(timeout_t, ktime_get_real_seconds() -
515 req->rq_arrival_time.tv_sec, 1,
516 (AT_OFF ? obd_timeout * 3 / 2 : at_max));
517 if (!(flags & PTLRPC_REPLY_EARLY) &&
518 (req->rq_type != PTL_RPC_MSG_ERR) &&
519 (req->rq_reqmsg != NULL) &&
520 !(lustre_msg_get_flags(req->rq_reqmsg) &
521 (MSG_RESENT | MSG_REPLAY |
522 MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
523 /* early replies, errors and recovery requests don't count
524 * toward our service time estimate
526 timeout_t oldse = at_measured(&svcpt->scp_at_estimate,
530 DEBUG_REQ(D_ADAPTTO, req,
531 "svc %s changed estimate from %d to %d",
532 svc->srv_name, oldse,
533 at_get(&svcpt->scp_at_estimate));
536 /* Report actual service time for client latency calc */
537 lustre_msg_set_service_timeout(req->rq_repmsg, service_timeout);
538 /* Report service time estimate for future client reqs, but report 0
539 * (to be ignored by client) if it's an error reply during recovery.
542 if (req->rq_type == PTL_RPC_MSG_ERR &&
543 (req->rq_export == NULL ||
544 req->rq_export->exp_obd->obd_recovering)) {
545 lustre_msg_set_timeout(req->rq_repmsg, 0);
549 if (req->rq_export && req->rq_reqmsg != NULL &&
550 (flags & PTLRPC_REPLY_EARLY) &&
551 lustre_msg_get_flags(req->rq_reqmsg) &
552 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
553 struct obd_device *exp_obd = req->rq_export->exp_obd;
555 timeout = ktime_get_real_seconds() -
556 req->rq_arrival_time.tv_sec +
557 min_t(timeout_t, at_extra,
558 exp_obd->obd_recovery_timeout / 4);
560 timeout = at_get(&svcpt->scp_at_estimate);
562 lustre_msg_set_timeout(req->rq_repmsg, timeout);
565 if (req->rq_reqmsg &&
566 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
567 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
568 "req_flags=%#x magic=%x/%x len=%d\n",
569 flags, lustre_msg_get_flags(req->rq_reqmsg),
570 lustre_msg_get_magic(req->rq_reqmsg),
571 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
576 * Send request reply from request \a req reply buffer.
577 * \a flags defines reply types
578 * Returns 0 on success or error code
580 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
582 struct ptlrpc_reply_state *rs = req->rq_reply_state;
583 struct ptlrpc_connection *conn;
586 /* We must already have a reply buffer (only ptlrpc_error() may be
587 * called without one). The reply generated by sptlrpc layer (e.g.
588 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
589 * have a request buffer which is either the actual (swabbed) incoming
590 * request, or a saved copy if this is a req saved in
591 * target_queue_final_reply().
593 LASSERT (req->rq_no_reply == 0);
594 LASSERT (req->rq_reqbuf != NULL);
595 LASSERT (rs != NULL);
596 LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
597 LASSERT (req->rq_repmsg != NULL);
598 LASSERT (req->rq_repmsg == rs->rs_msg);
599 LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
600 LASSERT (rs->rs_cb_id.cbid_arg == rs);
602 /* There may be no rq_export during failover */
604 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
605 req->rq_export->exp_obd->obd_fail)) {
606 /* Failed obd's only send ENODEV */
607 req->rq_type = PTL_RPC_MSG_ERR;
608 req->rq_status = -ENODEV;
609 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
610 req->rq_export->exp_obd->obd_minor);
613 if (req->rq_type != PTL_RPC_MSG_ERR)
614 req->rq_type = PTL_RPC_MSG_REPLY;
616 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
617 lustre_msg_set_status(req->rq_repmsg,
618 ptlrpc_status_hton(req->rq_status));
619 lustre_msg_set_opc(req->rq_repmsg,
620 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
622 target_pack_pool_reply(req);
624 ptlrpc_at_set_reply(req, flags);
626 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
627 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
629 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
631 if (unlikely(conn == NULL)) {
632 CERROR("not replying on NULL connection\n"); /* bug 9635 */
635 ptlrpc_rs_addref(rs); /* +1 ref for the network */
637 rc = sptlrpc_svc_wrap_reply(req);
641 req->rq_sent = ktime_get_real_seconds();
643 rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
644 (rs->rs_difficult && !rs->rs_no_ack) ?
645 LNET_ACK_REQ : LNET_NOACK_REQ,
646 &rs->rs_cb_id, req->rq_self, req->rq_source,
647 ptlrpc_req2svc(req)->srv_rep_portal,
648 req->rq_xid, req->rq_reply_off, NULL);
650 if (unlikely(rc != 0))
651 ptlrpc_req_drop_rs(req);
652 ptlrpc_connection_put(conn);
656 int ptlrpc_reply (struct ptlrpc_request *req)
658 if (req->rq_no_reply)
661 return (ptlrpc_send_reply(req, 0));
665 * For request \a req send an error reply back. Create empty
666 * reply buffers if necessary.
668 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
673 if (req->rq_no_reply)
676 if (!req->rq_repmsg) {
677 rc = lustre_pack_reply(req, 1, NULL, NULL);
682 if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
683 req->rq_status != -EPERM && req->rq_status != -ENOENT &&
684 req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
685 req->rq_type = PTL_RPC_MSG_ERR;
687 rc = ptlrpc_send_reply(req, may_be_difficult);
691 int ptlrpc_error(struct ptlrpc_request *req)
693 return ptlrpc_send_error(req, 0);
697 * Send request \a request.
698 * if \a noreply is set, don't expect any reply back and don't set up
700 * Returns 0 on success or error code.
702 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
706 struct lnet_handle_md bulk_cookie;
707 struct ptlrpc_connection *connection;
708 struct lnet_me *reply_me = NULL;
709 struct lnet_md reply_md;
710 struct obd_import *imp = request->rq_import;
711 struct obd_device *obd = imp->imp_obd;
714 LNetInvalidateMDHandle(&bulk_cookie);
716 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
719 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DELAY_RECOV) &&
720 lustre_msg_get_opc(request->rq_reqmsg) == MDS_CONNECT &&
721 strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) == 0)) {
725 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
726 LASSERT(request->rq_wait_ctx == 0);
728 /* If this is a re-transmit, we're required to have disengaged
729 * cleanly from the previous attempt */
730 LASSERT(!request->rq_receiving_reply);
731 LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
732 (imp->imp_state == LUSTRE_IMP_FULL)));
734 if (unlikely(obd != NULL && obd->obd_fail)) {
735 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
737 /* this prevents us from waiting in ptlrpc_queue_wait */
738 spin_lock(&request->rq_lock);
740 spin_unlock(&request->rq_lock);
741 request->rq_status = -ENODEV;
745 connection = imp->imp_connection;
747 lustre_msg_set_handle(request->rq_reqmsg,
748 &imp->imp_remote_handle);
749 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
750 lustre_msg_set_conn_cnt(request->rq_reqmsg,
752 lustre_msghdr_set_flags(request->rq_reqmsg,
753 imp->imp_msghdr_flags);
755 /* If it's the first time to resend the request for EINPROGRESS,
756 * we need to allocate a new XID (see after_reply()), it's different
757 * from the resend for reply timeout. */
758 if (request->rq_nr_resend != 0 &&
759 list_empty(&request->rq_unreplied_list)) {
761 /* resend for EINPROGRESS, allocate new xid to avoid reply
763 spin_lock(&imp->imp_lock);
764 ptlrpc_assign_next_xid_nolock(request);
765 min_xid = ptlrpc_known_replied_xid(imp);
766 spin_unlock(&imp->imp_lock);
768 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
769 DEBUG_REQ(D_RPCTRACE, request,
770 "Allocating new XID for resend on EINPROGRESS");
773 if (request->rq_bulk != NULL) {
774 ptlrpc_set_bulk_mbits(request);
775 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
778 if (list_empty(&request->rq_unreplied_list) ||
779 request->rq_xid <= imp->imp_known_replied_xid) {
780 DEBUG_REQ(D_ERROR, request,
781 "xid=%llu, replied=%llu, list_empty=%d",
782 request->rq_xid, imp->imp_known_replied_xid,
783 list_empty(&request->rq_unreplied_list));
787 /** For enabled AT all request should have AT_SUPPORT in the
788 * FULL import state when OBD_CONNECT_AT is set */
789 LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
790 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
791 !(imp->imp_connect_data.ocd_connect_flags &
794 if (request->rq_resend) {
795 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
796 if (request->rq_resend_cb != NULL)
797 request->rq_resend_cb(request, &request->rq_async_args);
799 if (request->rq_memalloc)
800 mpflag = memalloc_noreclaim_save();
802 rc = sptlrpc_cli_wrap_request(request);
806 /* bulk register should be done after wrap_request() */
807 if (request->rq_bulk != NULL) {
808 rc = ptlrpc_register_bulk (request);
810 GOTO(cleanup_bulk, rc);
812 * All the mds in the request will have the same cpt
813 * encoded in the cookie. So we can just get the first
816 bulk_cookie = request->rq_bulk->bd_mds[0];
820 LASSERT (request->rq_replen != 0);
821 if (request->rq_repbuf == NULL) {
822 LASSERT(request->rq_repdata == NULL);
823 LASSERT(request->rq_repmsg == NULL);
824 rc = sptlrpc_cli_alloc_repbuf(request,
827 /* this prevents us from looping in
828 * ptlrpc_queue_wait */
829 spin_lock(&request->rq_lock);
831 spin_unlock(&request->rq_lock);
832 request->rq_status = rc;
833 GOTO(cleanup_bulk, rc);
836 request->rq_repdata = NULL;
837 request->rq_repmsg = NULL;
840 if (request->rq_bulk &&
841 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_REPLY_ATTACH)) {
842 reply_me = ERR_PTR(-ENOMEM);
844 reply_me = LNetMEAttach(request->rq_reply_portal,
847 LNET_UNLINK, LNET_INS_AFTER);
850 if (IS_ERR(reply_me)) {
851 rc = PTR_ERR(reply_me);
852 CERROR("LNetMEAttach failed: %d\n", rc);
853 LASSERT(rc == -ENOMEM);
854 GOTO(cleanup_bulk, rc = -ENOMEM);
858 spin_lock(&request->rq_lock);
859 /* We are responsible for unlinking the reply buffer */
860 request->rq_reply_unlinked = noreply;
861 request->rq_receiving_reply = !noreply;
862 /* Clear any flags that may be present from previous sends. */
863 request->rq_req_unlinked = 0;
864 request->rq_replied = 0;
866 request->rq_timedout = 0;
867 request->rq_net_err = 0;
868 request->rq_resend = 0;
869 request->rq_restart = 0;
870 request->rq_reply_truncated = 0;
871 spin_unlock(&request->rq_lock);
874 reply_md.start = request->rq_repbuf;
875 reply_md.length = request->rq_repbuf_len;
876 /* Allow multiple early replies */
877 reply_md.threshold = LNET_MD_THRESH_INF;
878 /* Manage remote for early replies */
879 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
880 LNET_MD_MANAGE_REMOTE |
881 LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
882 reply_md.user_ptr = &request->rq_reply_cbid;
883 reply_md.handler = ptlrpc_handler;
885 /* We must see the unlink callback to set rq_reply_unlinked,
886 * so we can't auto-unlink */
887 rc = LNetMDAttach(reply_me, &reply_md, LNET_RETAIN,
888 &request->rq_reply_md_h);
890 CERROR("LNetMDAttach failed: %d\n", rc);
891 LASSERT(rc == -ENOMEM);
892 spin_lock(&request->rq_lock);
893 /* ...but the MD attach didn't succeed... */
894 request->rq_receiving_reply = 0;
895 spin_unlock(&request->rq_lock);
896 GOTO(cleanup_bulk, rc = -ENOMEM);
898 percpu_ref_get(&ptlrpc_pending);
901 "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
902 request->rq_repbuf_len, request->rq_xid,
903 request->rq_reply_portal);
906 /* add references on request for request_out_callback */
907 ptlrpc_request_addref(request);
908 if (obd != NULL && obd->obd_svc_stats != NULL)
909 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
910 atomic_read(&imp->imp_inflight));
912 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
914 request->rq_sent_ns = ktime_get_real();
915 request->rq_sent = ktime_get_real_seconds();
916 /* We give the server rq_timeout secs to process the req, and
917 * add the network latency for our local timeout.
919 request->rq_deadline = request->rq_sent + request->rq_timeout +
920 ptlrpc_at_get_net_latency(request);
922 DEBUG_REQ(D_INFO, request, "send flags=%x",
923 lustre_msg_get_flags(request->rq_reqmsg));
924 rc = ptl_send_buf(&request->rq_req_md_h,
925 request->rq_reqbuf, request->rq_reqdata_len,
926 LNET_NOACK_REQ, &request->rq_req_cbid,
927 LNET_NID_ANY, connection->c_peer,
928 request->rq_request_portal,
929 request->rq_xid, 0, &bulk_cookie);
933 request->rq_req_unlinked = 1;
934 ptlrpc_req_finished(request);
938 LNetMDUnlink(request->rq_reply_md_h);
940 /* UNLINKED callback called synchronously */
941 LASSERT(!request->rq_receiving_reply);
944 /* We do sync unlink here as there was no real transfer here so
945 * the chance to have long unlink to sluggish net is smaller here. */
946 ptlrpc_unregister_bulk(request, 0);
949 /* set rq_sent so that this request is treated
950 * as a delayed send in the upper layers */
951 request->rq_sent = ktime_get_real_seconds();
954 if (request->rq_memalloc)
955 memalloc_noreclaim_restore(mpflag);
959 EXPORT_SYMBOL(ptl_send_rpc);
962 * Register request buffer descriptor for request receiving.
964 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
966 struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
967 static struct lnet_process_id match_id = {
975 CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
976 service->srv_req_portal);
978 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
981 /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
982 * which means buffer can only be attached on local CPT, and LND
983 * threads can find it by grabbing a local lock */
984 me = LNetMEAttach(service->srv_req_portal,
985 match_id, 0, ~0, LNET_UNLINK,
986 rqbd->rqbd_svcpt->scp_cpt >= 0 ?
987 LNET_INS_LOCAL : LNET_INS_AFTER);
989 CERROR("LNetMEAttach failed: %ld\n", PTR_ERR(me));
993 LASSERT(rqbd->rqbd_refcount == 0);
994 rqbd->rqbd_refcount = 1;
996 md.start = rqbd->rqbd_buffer;
997 md.length = service->srv_buf_size;
998 md.max_size = service->srv_max_req_size;
999 md.threshold = LNET_MD_THRESH_INF;
1000 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
1001 md.user_ptr = &rqbd->rqbd_cbid;
1002 md.handler = ptlrpc_handler;
1004 rc = LNetMDAttach(me, &md, LNET_UNLINK, &rqbd->rqbd_md_h);
1006 percpu_ref_get(&ptlrpc_pending);
1010 CERROR("ptlrpc: LNetMDAttach failed: rc = %d\n", rc);
1011 LASSERT(rc == -ENOMEM);
1013 rqbd->rqbd_refcount = 0;