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/
32 #define DEBUG_SUBSYSTEM S_RPC
33 #include <libcfs/linux/linux-mem.h>
34 #include <obd_support.h>
35 #include <lustre_net.h>
36 #include <lustre_lib.h>
38 #include <obd_class.h>
39 #include "ptlrpc_internal.h"
40 #include <lnet/lib-lnet.h> /* for CFS_FAIL_PTLRPC_OST_BULK_CB2 */
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.
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)
57 LASSERT (portal != 0);
58 CDEBUG (D_INFO, "peer_id %s\n", libcfs_id2str(peer_id));
61 md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
62 md.options = PTLRPC_MD_OPTIONS;
64 md.handler = ptlrpc_handler;
65 LNetInvalidateMDHandle(&md.bulk_handle);
68 md.bulk_handle = *bulk_cookie;
69 md.options |= LNET_MD_BULK_HANDLE;
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 */
78 rc = LNetMDBind(&md, LNET_UNLINK, mdh);
79 if (unlikely(rc != 0)) {
80 CERROR ("LNetMDBind failed: %d\n", rc);
81 LASSERT (rc == -ENOMEM);
85 CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
86 len, portal, xid, offset);
88 percpu_ref_get(&ptlrpc_pending);
90 rc = LNetPut(self, *mdh, ack,
91 peer_id, portal, xid, offset, 0);
92 if (unlikely(rc != 0)) {
94 /* We're going to get an UNLINK event when I unlink below,
95 * which will complete just like any other failed send, so
96 * I fall through and return success here! */
97 CERROR("LNetPut(%s, %d, %lld) failed: %d\n",
98 libcfs_id2str(peer_id), portal, xid, rc);
99 rc2 = LNetMDUnlink(*mdh);
100 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
106 #define mdunlink_iterate_helper(mds, count) \
107 __mdunlink_iterate_helper(mds, count, false)
108 static void __mdunlink_iterate_helper(struct lnet_handle_md *bd_mds,
109 int count, bool discard)
113 for (i = 0; i < count; i++)
114 __LNetMDUnlink(bd_mds[i], discard);
117 #ifdef HAVE_SERVER_SUPPORT
119 * Prepare bulk descriptor for specified incoming request \a req that
120 * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
121 * the bulk to be sent. Used on server-side after request was already
123 * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
126 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
127 unsigned nfrags, unsigned max_brw,
130 const struct ptlrpc_bulk_frag_ops
133 struct obd_export *exp = req->rq_export;
134 struct ptlrpc_bulk_desc *desc;
137 LASSERT(ptlrpc_is_bulk_op_active(type));
139 desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
143 desc->bd_export = class_export_get(exp);
146 desc->bd_cbid.cbid_fn = server_bulk_callback;
147 desc->bd_cbid.cbid_arg = desc;
149 /* NB we don't assign rq_bulk here; server-side requests are
150 * re-used, and the handler frees the bulk desc explicitly. */
154 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
157 * Starts bulk transfer for descriptor \a desc on the server.
158 * Returns 0 on success or error code.
160 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
162 struct obd_export *exp = desc->bd_export;
164 struct lnet_process_id peer_id;
172 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
175 /* NB no locking required until desc is on the network */
176 LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
178 LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
179 LASSERT(desc->bd_cbid.cbid_arg == desc);
182 * Multi-Rail: get the preferred self and peer NIDs from the
183 * request, so they are based on the route taken by the
186 self_nid = desc->bd_req->rq_self;
187 peer_id = desc->bd_req->rq_source;
189 /* NB total length may be 0 for a read past EOF, so we send 0
190 * length bulks, since the client expects bulk events.
192 * The client may not need all of the bulk mbits for the RPC. The RPC
193 * used the mbits of the highest bulk mbits needed, and the server masks
194 * off high bits to get bulk count for this RPC. LU-1431 */
195 mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
196 total_md = desc->bd_req->rq_mbits - mbits + 1;
197 desc->bd_refs = total_md;
198 desc->bd_failure = 0;
200 md.user_ptr = &desc->bd_cbid;
201 md.handler = ptlrpc_handler;
202 md.threshold = 2; /* SENT and ACK/REPLY */
204 for (posted_md = 0; posted_md < total_md; mbits++) {
205 md.options = PTLRPC_MD_OPTIONS;
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]);
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;
222 percpu_ref_get(&ptlrpc_pending);
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);
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);
235 rc = LNetGet(self_nid, desc->bd_mds[posted_md],
236 peer_id, desc->bd_portal, mbits, 0, false);
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,
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_refs -= total_md - posted_md;
254 spin_unlock(&desc->bd_lock);
255 LASSERT(desc->bd_refs >= 0);
257 mdunlink_iterate_helper(desc->bd_mds, posted_md);
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);
270 * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
271 * serialises with completion callback)
273 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
275 LASSERT(!in_interrupt()); /* might sleep */
277 if (!ptlrpc_server_bulk_active(desc)) /* completed or */
278 return; /* never started */
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
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()
290 __mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw, true);
293 /* Network access will complete in finite time but the HUGE
294 * timeout lets us CWARN for visibility of sluggish NALs */
295 int seconds = PTLRPC_REQ_LONG_UNLINK;
297 while (seconds > 0 &&
298 wait_event_idle_timeout(desc->bd_waitq,
299 !ptlrpc_server_bulk_active(desc),
300 cfs_time_seconds(1)) == 0)
305 CWARN("Unexpectedly long timeout: desc %p\n", desc);
308 #endif /* HAVE_SERVER_SUPPORT */
311 * Register bulk at the sender for later transfer.
312 * Returns 0 on success or error code.
314 int ptlrpc_register_bulk(struct ptlrpc_request *req)
316 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
317 struct lnet_processid peer;
326 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
329 /* NB no locking required until desc is on the network */
330 LASSERT(desc->bd_nob > 0);
331 LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT);
332 LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
333 LASSERT(desc->bd_req != NULL);
334 LASSERT(ptlrpc_is_bulk_op_passive(desc->bd_type));
336 /* cleanup the state of the bulk for it will be reused */
337 if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY)
338 desc->bd_nob_transferred = 0;
339 else if (desc->bd_nob_transferred != 0)
340 /* If the network failed after an RPC was sent, this condition
341 * could happen. Rather than assert (was here before), return
345 desc->bd_failure = 0;
347 peer.pid = desc->bd_import->imp_connection->c_peer.pid;
348 lnet_nid4_to_nid(desc->bd_import->imp_connection->c_peer.nid,
351 LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
352 LASSERT(desc->bd_cbid.cbid_arg == desc);
354 total_md = desc->bd_md_count;
355 /* rq_mbits is matchbits of the final bulk */
356 mbits = req->rq_mbits - desc->bd_md_count + 1;
358 LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK),
359 "first mbits = x%llu, last mbits = x%llu\n",
360 mbits, req->rq_mbits);
361 LASSERTF(!(desc->bd_registered &&
362 req->rq_send_state != LUSTRE_IMP_REPLAY) ||
363 mbits != desc->bd_last_mbits,
364 "registered: %d rq_mbits: %llu bd_last_mbits: %llu\n",
365 desc->bd_registered, mbits, desc->bd_last_mbits);
367 desc->bd_registered = 1;
368 desc->bd_last_mbits = mbits;
369 desc->bd_refs = total_md;
370 md.user_ptr = &desc->bd_cbid;
371 md.handler = ptlrpc_handler;
372 md.threshold = 1; /* PUT or GET */
374 for (posted_md = 0; posted_md < desc->bd_md_count;
375 posted_md++, mbits++) {
376 md.options = PTLRPC_MD_OPTIONS |
377 (ptlrpc_is_bulk_op_get(desc->bd_type) ?
378 LNET_MD_OP_GET : LNET_MD_OP_PUT);
379 ptlrpc_fill_bulk_md(&md, desc, posted_md);
381 if (posted_md > 0 && posted_md + 1 == desc->bd_md_count &&
382 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) {
385 me = LNetMEAttach(desc->bd_portal, &peer, mbits, 0,
386 LNET_UNLINK, LNET_INS_AFTER);
387 rc = PTR_ERR_OR_ZERO(me);
390 CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
391 desc->bd_import->imp_obd->obd_name, mbits,
395 percpu_ref_get(&ptlrpc_pending);
397 /* About to let the network at it... */
398 rc = LNetMDAttach(me, &md, LNET_UNLINK,
399 &desc->bd_mds[posted_md]);
401 CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
402 desc->bd_import->imp_obd->obd_name, mbits,
409 LASSERT(rc == -ENOMEM);
410 spin_lock(&desc->bd_lock);
411 desc->bd_refs -= total_md - posted_md;
412 spin_unlock(&desc->bd_lock);
413 LASSERT(desc->bd_refs >= 0);
414 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
415 req->rq_status = -ENOMEM;
416 desc->bd_registered = 0;
420 spin_lock(&desc->bd_lock);
421 /* Holler if peer manages to touch buffers before he knows the mbits */
422 if (desc->bd_refs != total_md)
423 CWARN("%s: Peer %s touched %d buffers while I registered\n",
424 desc->bd_import->imp_obd->obd_name, libcfs_idstr(&peer),
425 total_md - desc->bd_refs);
426 spin_unlock(&desc->bd_lock);
429 "Setup %u bulk %s buffers: %u pages %u bytes, mbits x%#llx-%#llx, portal %u\n",
431 ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
432 desc->bd_iov_count, desc->bd_nob,
433 desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
439 * Disconnect a bulk desc from the network. Idempotent. Not
440 * thread-safe (i.e. only interlocks with completion callback).
441 * Returns 1 on success or 0 if network unregistration failed for whatever
444 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
446 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
449 LASSERT(!in_interrupt()); /* might sleep */
452 desc->bd_registered = 0;
454 /* Let's setup deadline for reply unlink. */
455 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
456 async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
457 req->rq_bulk_deadline = ktime_get_real_seconds() +
458 PTLRPC_REQ_LONG_UNLINK;
460 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
461 RETURN(1); /* never registered */
463 LASSERT(desc->bd_req == req); /* bd_req NULL until registered */
465 /* the unlink ensures the callback happens ASAP and is the last
466 * one. If it fails, it must be because completion just happened,
467 * but we must still wait_event_idle_timeout() in this case to give
468 * us a chance to run client_bulk_callback()
470 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
472 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
473 RETURN(1); /* never registered */
475 /* Move to "Unregistering" phase as bulk was not unlinked yet. */
476 ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
478 /* Do not wait for unlink to finish. */
483 /* The wq argument is ignored by user-space wait_event macros */
484 wait_queue_head_t *wq = (req->rq_set != NULL) ?
485 &req->rq_set->set_waitq :
486 &req->rq_reply_waitq;
488 * Network access will complete in finite time but the HUGE
489 * timeout lets us CWARN for visibility of sluggish NALs.
491 int seconds = PTLRPC_REQ_LONG_UNLINK;
493 while (seconds > 0 &&
494 wait_event_idle_timeout(*wq,
495 !ptlrpc_client_bulk_active(req),
496 cfs_time_seconds(1)) == 0)
499 ptlrpc_rqphase_move(req, req->rq_next_phase);
503 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
509 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
511 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
512 struct ptlrpc_service *svc = svcpt->scp_service;
513 timeout_t service_timeout;
515 service_timeout = clamp_t(timeout_t, ktime_get_real_seconds() -
516 req->rq_arrival_time.tv_sec, 1,
517 (AT_OFF ? obd_timeout * 3 / 2 : at_max));
518 if (!(flags & PTLRPC_REPLY_EARLY) &&
519 (req->rq_type != PTL_RPC_MSG_ERR) &&
520 (req->rq_reqmsg != NULL) &&
521 !(lustre_msg_get_flags(req->rq_reqmsg) &
522 (MSG_RESENT | MSG_REPLAY |
523 MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
524 /* early replies, errors and recovery requests don't count
525 * toward our service time estimate
527 timeout_t oldse = at_measured(&svcpt->scp_at_estimate,
531 DEBUG_REQ(D_ADAPTTO, req,
532 "svc %s changed estimate from %d to %d",
533 svc->srv_name, oldse,
534 at_get(&svcpt->scp_at_estimate));
537 /* Report actual service time for client latency calc */
538 lustre_msg_set_service_timeout(req->rq_repmsg, service_timeout);
539 /* Report service time estimate for future client reqs, but report 0
540 * (to be ignored by client) if it's an error reply during recovery.
543 if (req->rq_type == PTL_RPC_MSG_ERR &&
544 (req->rq_export == NULL ||
545 req->rq_export->exp_obd->obd_recovering)) {
546 lustre_msg_set_timeout(req->rq_repmsg, 0);
550 if (req->rq_export && req->rq_reqmsg != NULL &&
551 (flags & PTLRPC_REPLY_EARLY) &&
552 lustre_msg_get_flags(req->rq_reqmsg) &
553 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
554 struct obd_device *exp_obd = req->rq_export->exp_obd;
556 timeout = ktime_get_real_seconds() -
557 req->rq_arrival_time.tv_sec +
558 min_t(timeout_t, at_extra,
559 exp_obd->obd_recovery_timeout / 4);
561 timeout = at_get(&svcpt->scp_at_estimate);
563 lustre_msg_set_timeout(req->rq_repmsg, timeout);
566 if (req->rq_reqmsg &&
567 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
568 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
569 "req_flags=%#x magic=%x/%x len=%d\n",
570 flags, lustre_msg_get_flags(req->rq_reqmsg),
571 lustre_msg_get_magic(req->rq_reqmsg),
572 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
577 * Send request reply from request \a req reply buffer.
578 * \a flags defines reply types
579 * Returns 0 on success or error code
581 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
583 struct ptlrpc_reply_state *rs = req->rq_reply_state;
584 struct ptlrpc_connection *conn;
587 /* We must already have a reply buffer (only ptlrpc_error() may be
588 * called without one). The reply generated by sptlrpc layer (e.g.
589 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
590 * have a request buffer which is either the actual (swabbed) incoming
591 * request, or a saved copy if this is a req saved in
592 * target_queue_final_reply().
594 LASSERT (req->rq_no_reply == 0);
595 LASSERT (req->rq_reqbuf != NULL);
596 LASSERT (rs != NULL);
597 LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
598 LASSERT (req->rq_repmsg != NULL);
599 LASSERT (req->rq_repmsg == rs->rs_msg);
600 LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
601 LASSERT (rs->rs_cb_id.cbid_arg == rs);
603 /* There may be no rq_export during failover */
605 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
606 req->rq_export->exp_obd->obd_fail)) {
607 /* Failed obd's only send ENODEV */
608 req->rq_type = PTL_RPC_MSG_ERR;
609 req->rq_status = -ENODEV;
610 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
611 req->rq_export->exp_obd->obd_minor);
614 if (req->rq_type != PTL_RPC_MSG_ERR)
615 req->rq_type = PTL_RPC_MSG_REPLY;
617 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
618 lustre_msg_set_status(req->rq_repmsg,
619 ptlrpc_status_hton(req->rq_status));
620 lustre_msg_set_opc(req->rq_repmsg,
621 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
623 target_pack_pool_reply(req);
625 ptlrpc_at_set_reply(req, flags);
627 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
628 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
630 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
632 if (unlikely(conn == NULL)) {
633 CERROR("not replying on NULL connection\n"); /* bug 9635 */
636 ptlrpc_rs_addref(rs); /* +1 ref for the network */
638 rc = sptlrpc_svc_wrap_reply(req);
642 req->rq_sent = ktime_get_real_seconds();
644 rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
645 (rs->rs_difficult && !rs->rs_no_ack) ?
646 LNET_ACK_REQ : LNET_NOACK_REQ,
647 &rs->rs_cb_id, req->rq_self, req->rq_source,
648 ptlrpc_req2svc(req)->srv_rep_portal,
649 req->rq_rep_mbits ? req->rq_rep_mbits : req->rq_xid,
650 req->rq_reply_off, NULL);
652 if (unlikely(rc != 0))
653 ptlrpc_req_drop_rs(req);
654 ptlrpc_connection_put(conn);
658 int ptlrpc_reply (struct ptlrpc_request *req)
660 if (req->rq_no_reply)
663 return (ptlrpc_send_reply(req, 0));
667 * For request \a req send an error reply back. Create empty
668 * reply buffers if necessary.
670 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
675 if (req->rq_no_reply)
678 if (!req->rq_repmsg) {
679 rc = lustre_pack_reply(req, 1, NULL, NULL);
684 if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
685 req->rq_status != -EPERM && req->rq_status != -ENOENT &&
686 req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
687 req->rq_type = PTL_RPC_MSG_ERR;
689 rc = ptlrpc_send_reply(req, may_be_difficult);
693 int ptlrpc_error(struct ptlrpc_request *req)
695 return ptlrpc_send_error(req, 0);
699 * Send request \a request.
700 * if \a noreply is set, don't expect any reply back and don't set up
702 * Returns 0 on success or error code.
704 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
709 bool rep_mbits = false;
710 struct lnet_handle_md bulk_cookie;
711 struct lnet_processid peer;
712 struct ptlrpc_connection *connection;
713 struct lnet_me *reply_me = NULL;
714 struct lnet_md reply_md;
715 struct obd_import *imp = request->rq_import;
716 struct obd_device *obd = imp->imp_obd;
719 LNetInvalidateMDHandle(&bulk_cookie);
721 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
724 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DELAY_RECOV) &&
725 lustre_msg_get_opc(request->rq_reqmsg) == MDS_CONNECT &&
726 strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) == 0)) {
730 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
731 LASSERT(request->rq_wait_ctx == 0);
733 /* If this is a re-transmit, we're required to have disengaged
734 * cleanly from the previous attempt */
735 LASSERT(!request->rq_receiving_reply);
736 LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
737 (imp->imp_state == LUSTRE_IMP_FULL)));
739 if (unlikely(obd != NULL && obd->obd_fail)) {
740 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
742 /* this prevents us from waiting in ptlrpc_queue_wait */
743 spin_lock(&request->rq_lock);
745 spin_unlock(&request->rq_lock);
746 request->rq_status = -ENODEV;
750 connection = imp->imp_connection;
752 lustre_msg_set_handle(request->rq_reqmsg,
753 &imp->imp_remote_handle);
754 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
755 lustre_msg_set_conn_cnt(request->rq_reqmsg,
757 lustre_msghdr_set_flags(request->rq_reqmsg,
758 imp->imp_msghdr_flags);
760 /* If it's the first time to resend the request for EINPROGRESS,
761 * we need to allocate a new XID (see after_reply()), it's different
762 * from the resend for reply timeout. */
763 if (request->rq_nr_resend != 0 &&
764 list_empty(&request->rq_unreplied_list)) {
766 /* resend for EINPROGRESS, allocate new xid to avoid reply
768 spin_lock(&imp->imp_lock);
769 ptlrpc_assign_next_xid_nolock(request);
770 min_xid = ptlrpc_known_replied_xid(imp);
771 spin_unlock(&imp->imp_lock);
773 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
774 DEBUG_REQ(D_RPCTRACE, request,
775 "Allocating new XID for resend on EINPROGRESS");
778 opc = lustre_msg_get_opc(request->rq_reqmsg);
779 if (opc != OST_CONNECT && opc != MDS_CONNECT &&
780 opc != MGS_CONNECT && OCD_HAS_FLAG(&imp->imp_connect_data, FLAGS2))
781 rep_mbits = imp->imp_connect_data.ocd_connect_flags2 &
782 OBD_CONNECT2_REP_MBITS;
784 if ((request->rq_bulk != NULL) || rep_mbits) {
785 ptlrpc_set_mbits(request);
786 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
789 if (list_empty(&request->rq_unreplied_list) ||
790 request->rq_xid <= imp->imp_known_replied_xid) {
791 DEBUG_REQ(D_ERROR, request,
792 "xid=%llu, replied=%llu, list_empty=%d",
793 request->rq_xid, imp->imp_known_replied_xid,
794 list_empty(&request->rq_unreplied_list));
798 /** For enabled AT all request should have AT_SUPPORT in the
799 * FULL import state when OBD_CONNECT_AT is set */
800 LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
801 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
802 !(imp->imp_connect_data.ocd_connect_flags &
805 if (request->rq_resend) {
806 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
807 if (request->rq_resend_cb != NULL)
808 request->rq_resend_cb(request, &request->rq_async_args);
810 if (request->rq_memalloc)
811 mpflag = memalloc_noreclaim_save();
813 rc = sptlrpc_cli_wrap_request(request);
817 /* bulk register should be done after wrap_request() */
818 if (request->rq_bulk != NULL) {
819 rc = ptlrpc_register_bulk (request);
821 GOTO(cleanup_bulk, rc);
823 * All the mds in the request will have the same cpt
824 * encoded in the cookie. So we can just get the first
827 bulk_cookie = request->rq_bulk->bd_mds[0];
831 LASSERT (request->rq_replen != 0);
832 if (request->rq_repbuf == NULL) {
833 LASSERT(request->rq_repdata == NULL);
834 LASSERT(request->rq_repmsg == NULL);
835 rc = sptlrpc_cli_alloc_repbuf(request,
838 /* this prevents us from looping in
839 * ptlrpc_queue_wait */
840 spin_lock(&request->rq_lock);
842 spin_unlock(&request->rq_lock);
843 request->rq_status = rc;
844 GOTO(cleanup_bulk, rc);
847 request->rq_repdata = NULL;
848 request->rq_repmsg = NULL;
851 peer.pid = connection->c_peer.pid;
852 lnet_nid4_to_nid(connection->c_peer.nid, &peer.nid);
853 if (request->rq_bulk &&
854 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_REPLY_ATTACH)) {
855 reply_me = ERR_PTR(-ENOMEM);
857 reply_me = LNetMEAttach(request->rq_reply_portal,
859 rep_mbits ? request->rq_mbits :
861 0, LNET_UNLINK, LNET_INS_AFTER);
864 if (IS_ERR(reply_me)) {
865 rc = PTR_ERR(reply_me);
866 CERROR("LNetMEAttach failed: %d\n", rc);
867 LASSERT(rc == -ENOMEM);
868 GOTO(cleanup_bulk, rc = -ENOMEM);
872 spin_lock(&request->rq_lock);
873 /* We are responsible for unlinking the reply buffer */
874 request->rq_reply_unlinked = noreply;
875 request->rq_receiving_reply = !noreply;
876 /* Clear any flags that may be present from previous sends. */
877 request->rq_req_unlinked = 0;
878 request->rq_replied = 0;
880 request->rq_timedout = 0;
881 request->rq_net_err = 0;
882 request->rq_resend = 0;
883 request->rq_restart = 0;
884 request->rq_reply_truncated = 0;
885 spin_unlock(&request->rq_lock);
888 reply_md.start = request->rq_repbuf;
889 reply_md.length = request->rq_repbuf_len;
890 /* Allow multiple early replies */
891 reply_md.threshold = LNET_MD_THRESH_INF;
892 /* Manage remote for early replies */
893 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
894 LNET_MD_MANAGE_REMOTE |
895 LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
896 reply_md.user_ptr = &request->rq_reply_cbid;
897 reply_md.handler = ptlrpc_handler;
899 /* We must see the unlink callback to set rq_reply_unlinked,
900 * so we can't auto-unlink */
901 rc = LNetMDAttach(reply_me, &reply_md, LNET_RETAIN,
902 &request->rq_reply_md_h);
904 CERROR("LNetMDAttach failed: %d\n", rc);
905 LASSERT(rc == -ENOMEM);
906 spin_lock(&request->rq_lock);
907 /* ...but the MD attach didn't succeed... */
908 request->rq_receiving_reply = 0;
909 spin_unlock(&request->rq_lock);
910 GOTO(cleanup_bulk, rc = -ENOMEM);
912 percpu_ref_get(&ptlrpc_pending);
915 "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
916 request->rq_repbuf_len, request->rq_xid,
917 request->rq_reply_portal);
920 /* add references on request for request_out_callback */
921 ptlrpc_request_addref(request);
922 if (obd != NULL && obd->obd_svc_stats != NULL)
923 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
924 atomic_read(&imp->imp_inflight));
926 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
928 request->rq_sent_ns = ktime_get_real();
929 request->rq_sent = ktime_get_real_seconds();
930 /* We give the server rq_timeout secs to process the req, and
931 * add the network latency for our local timeout.
933 request->rq_deadline = request->rq_sent + request->rq_timeout +
934 ptlrpc_at_get_net_latency(request);
936 DEBUG_REQ(D_INFO, request, "send flags=%x",
937 lustre_msg_get_flags(request->rq_reqmsg));
938 rc = ptl_send_buf(&request->rq_req_md_h,
939 request->rq_reqbuf, request->rq_reqdata_len,
940 LNET_NOACK_REQ, &request->rq_req_cbid,
941 LNET_NID_ANY, connection->c_peer,
942 request->rq_request_portal,
943 request->rq_xid, 0, &bulk_cookie);
947 request->rq_req_unlinked = 1;
948 ptlrpc_req_finished(request);
952 LNetMDUnlink(request->rq_reply_md_h);
954 /* UNLINKED callback called synchronously */
955 LASSERT(!request->rq_receiving_reply);
958 /* We do sync unlink here as there was no real transfer here so
959 * the chance to have long unlink to sluggish net is smaller here. */
960 ptlrpc_unregister_bulk(request, 0);
963 /* set rq_sent so that this request is treated
964 * as a delayed send in the upper layers */
965 request->rq_sent = ktime_get_real_seconds();
968 if (request->rq_memalloc)
969 memalloc_noreclaim_restore(mpflag);
973 EXPORT_SYMBOL(ptl_send_rpc);
976 * Register request buffer descriptor for request receiving.
978 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
980 struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
981 static struct lnet_processid match_id = {
989 CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
990 service->srv_req_portal);
992 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
995 /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
996 * which means buffer can only be attached on local CPT, and LND
997 * threads can find it by grabbing a local lock */
998 me = LNetMEAttach(service->srv_req_portal,
999 &match_id, 0, ~0, LNET_UNLINK,
1000 rqbd->rqbd_svcpt->scp_cpt >= 0 ?
1001 LNET_INS_LOCAL : LNET_INS_AFTER);
1003 CERROR("LNetMEAttach failed: %ld\n", PTR_ERR(me));
1007 LASSERT(rqbd->rqbd_refcount == 0);
1008 rqbd->rqbd_refcount = 1;
1010 md.start = rqbd->rqbd_buffer;
1011 md.length = service->srv_buf_size;
1012 md.max_size = service->srv_max_req_size;
1013 md.threshold = LNET_MD_THRESH_INF;
1014 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
1015 md.user_ptr = &rqbd->rqbd_cbid;
1016 md.handler = ptlrpc_handler;
1018 rc = LNetMDAttach(me, &md, LNET_UNLINK, &rqbd->rqbd_md_h);
1020 percpu_ref_get(&ptlrpc_pending);
1024 CERROR("ptlrpc: LNetMDAttach failed: rc = %d\n", rc);
1025 LASSERT(rc == -ENOMEM);
1027 rqbd->rqbd_refcount = 0;