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 self4, struct lnet_processid *peer_id,
50 int portal, __u64 xid, unsigned int offset,
51 struct lnet_handle_md *bulk_cookie)
58 lnet_nid4_to_nid(self4, &self);
61 CDEBUG(D_INFO, "peer_id %s\n", libcfs_idstr(peer_id));
64 md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
65 md.options = PTLRPC_MD_OPTIONS;
67 md.handler = ptlrpc_handler;
68 LNetInvalidateMDHandle(&md.bulk_handle);
71 md.bulk_handle = *bulk_cookie;
72 md.options |= LNET_MD_BULK_HANDLE;
75 if (unlikely(ack == LNET_ACK_REQ &&
76 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
77 /* don't ask for the ack to simulate failing client */
81 rc = LNetMDBind(&md, LNET_UNLINK, mdh);
82 if (unlikely(rc != 0)) {
83 CERROR ("LNetMDBind failed: %d\n", rc);
84 LASSERT (rc == -ENOMEM);
88 CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
89 len, portal, xid, offset);
91 percpu_ref_get(&ptlrpc_pending);
93 rc = LNetPut(&self, *mdh, ack,
94 peer_id, portal, xid, offset, 0);
95 if (unlikely(rc != 0)) {
97 /* We're going to get an UNLINK event when I unlink below,
98 * which will complete just like any other failed send, so
99 * I fall through and return success here! */
100 CERROR("LNetPut(%s, %d, %lld) failed: %d\n",
101 libcfs_idstr(peer_id), portal, xid, rc);
102 rc2 = LNetMDUnlink(*mdh);
103 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
109 #define mdunlink_iterate_helper(mds, count) \
110 __mdunlink_iterate_helper(mds, count, false)
111 static void __mdunlink_iterate_helper(struct lnet_handle_md *bd_mds,
112 int count, bool discard)
116 for (i = 0; i < count; i++)
117 __LNetMDUnlink(bd_mds[i], discard);
120 #ifdef HAVE_SERVER_SUPPORT
122 * Prepare bulk descriptor for specified incoming request \a req that
123 * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
124 * the bulk to be sent. Used on server-side after request was already
126 * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
129 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
130 unsigned nfrags, unsigned max_brw,
133 const struct ptlrpc_bulk_frag_ops
136 struct obd_export *exp = req->rq_export;
137 struct ptlrpc_bulk_desc *desc;
140 LASSERT(ptlrpc_is_bulk_op_active(type));
142 desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
146 desc->bd_export = class_export_get(exp);
149 desc->bd_cbid.cbid_fn = server_bulk_callback;
150 desc->bd_cbid.cbid_arg = desc;
152 /* NB we don't assign rq_bulk here; server-side requests are
153 * re-used, and the handler frees the bulk desc explicitly. */
157 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
160 * Starts bulk transfer for descriptor \a desc on the server.
161 * Returns 0 on success or error code.
163 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
165 struct obd_export *exp = desc->bd_export;
166 struct lnet_nid self_nid;
167 struct lnet_processid peer_id;
175 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
178 /* NB no locking required until desc is on the network */
179 LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
181 LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
182 LASSERT(desc->bd_cbid.cbid_arg == desc);
185 * Multi-Rail: get the preferred self and peer NIDs from the
186 * request, so they are based on the route taken by the
189 self_nid = desc->bd_req->rq_self;
190 peer_id = desc->bd_req->rq_source;
192 /* NB total length may be 0 for a read past EOF, so we send 0
193 * length bulks, since the client expects bulk events.
195 * The client may not need all of the bulk mbits for the RPC. The RPC
196 * used the mbits of the highest bulk mbits needed, and the server masks
197 * off high bits to get bulk count for this RPC. LU-1431 */
198 mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
199 total_md = desc->bd_req->rq_mbits - mbits + 1;
200 desc->bd_refs = total_md;
201 desc->bd_failure = 0;
203 md.user_ptr = &desc->bd_cbid;
204 md.handler = ptlrpc_handler;
205 md.threshold = 2; /* SENT and ACK/REPLY */
207 for (posted_md = 0; posted_md < total_md; mbits++) {
208 md.options = PTLRPC_MD_OPTIONS;
210 /* NB it's assumed that source and sink buffer frags are
211 * page-aligned. Otherwise we'd have to send client bulk
212 * sizes over and split server buffer accordingly */
213 ptlrpc_fill_bulk_md(&md, desc, posted_md);
214 rc = LNetMDBind(&md, LNET_UNLINK, &desc->bd_mds[posted_md]);
216 CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n",
217 exp->exp_obd->obd_name, posted_md, rc);
218 LASSERT(rc == -ENOMEM);
219 if (posted_md == 0) {
220 desc->bd_md_count = 0;
225 percpu_ref_get(&ptlrpc_pending);
227 /* sanity.sh 224c: lets skip last md */
228 if (posted_md == desc->bd_md_max_brw - 1)
229 OBD_FAIL_CHECK_RESET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3,
230 CFS_FAIL_PTLRPC_OST_BULK_CB2);
232 /* Network is about to get at the memory */
233 if (ptlrpc_is_bulk_put_source(desc->bd_type))
234 rc = LNetPut(&self_nid, desc->bd_mds[posted_md],
235 LNET_ACK_REQ, &peer_id,
236 desc->bd_portal, mbits, 0, 0);
238 rc = LNetGet(&self_nid, desc->bd_mds[posted_md],
239 &peer_id, desc->bd_portal,
244 CERROR("%s: failed bulk transfer with %s:%u x%llu: "
245 "rc = %d\n", exp->exp_obd->obd_name,
246 libcfs_idstr(&peer_id), desc->bd_portal,
253 /* Can't send, so we unlink the MD bound above. The UNLINK
254 * event this creates will signal completion with failure,
255 * so we return SUCCESS here! */
256 spin_lock(&desc->bd_lock);
257 desc->bd_refs -= total_md - posted_md;
258 spin_unlock(&desc->bd_lock);
259 LASSERT(desc->bd_refs >= 0);
261 mdunlink_iterate_helper(desc->bd_mds, posted_md);
265 CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
266 "id %s mbits %#llx-%#llx\n", desc->bd_iov_count,
267 desc->bd_nob, desc->bd_portal, libcfs_idstr(&peer_id),
268 mbits - posted_md, mbits - 1);
274 * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
275 * serialises with completion callback)
277 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
279 LASSERT(!in_interrupt()); /* might sleep */
281 if (!ptlrpc_server_bulk_active(desc)) /* completed or */
282 return; /* never started */
284 /* We used to poison the pages with 0xab here because we did not want to
285 * send any meaningful data over the wire for evicted clients (bug 9297)
286 * However, this is no longer safe now that we use the page cache on the
289 /* The unlink ensures the callback happens ASAP and is the last
290 * one. If it fails, it must be because completion just happened,
291 * but we must still wait_event_idle_timeout() in this case, to give
292 * us a chance to run server_bulk_callback()
294 __mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw, true);
297 /* Network access will complete in finite time but the HUGE
298 * timeout lets us CWARN for visibility of sluggish NALs */
299 int seconds = PTLRPC_REQ_LONG_UNLINK;
301 while (seconds > 0 &&
302 wait_event_idle_timeout(desc->bd_waitq,
303 !ptlrpc_server_bulk_active(desc),
304 cfs_time_seconds(1)) == 0)
309 CWARN("Unexpectedly long timeout: desc %p\n", desc);
312 #endif /* HAVE_SERVER_SUPPORT */
315 * Register bulk at the sender for later transfer.
316 * Returns 0 on success or error code.
318 int ptlrpc_register_bulk(struct ptlrpc_request *req)
320 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
321 struct lnet_processid peer;
330 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
333 /* NB no locking required until desc is on the network */
334 LASSERT(desc->bd_nob > 0);
335 LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT);
336 LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
337 LASSERT(desc->bd_req != NULL);
338 LASSERT(ptlrpc_is_bulk_op_passive(desc->bd_type));
340 /* cleanup the state of the bulk for it will be reused */
341 if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY)
342 desc->bd_nob_transferred = 0;
343 else if (desc->bd_nob_transferred != 0)
344 /* If the network failed after an RPC was sent, this condition
345 * could happen. Rather than assert (was here before), return
349 desc->bd_failure = 0;
351 peer = desc->bd_import->imp_connection->c_peer;
353 LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
354 LASSERT(desc->bd_cbid.cbid_arg == desc);
356 total_md = desc->bd_md_count;
357 /* rq_mbits is matchbits of the final bulk */
358 mbits = req->rq_mbits - desc->bd_md_count + 1;
360 LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK),
361 "first mbits = x%llu, last mbits = x%llu\n",
362 mbits, req->rq_mbits);
363 LASSERTF(!(desc->bd_registered &&
364 req->rq_send_state != LUSTRE_IMP_REPLAY) ||
365 mbits != desc->bd_last_mbits,
366 "registered: %d rq_mbits: %llu bd_last_mbits: %llu\n",
367 desc->bd_registered, mbits, desc->bd_last_mbits);
369 desc->bd_registered = 1;
370 desc->bd_last_mbits = mbits;
371 desc->bd_refs = total_md;
372 md.user_ptr = &desc->bd_cbid;
373 md.handler = ptlrpc_handler;
374 md.threshold = 1; /* PUT or GET */
376 for (posted_md = 0; posted_md < desc->bd_md_count;
377 posted_md++, mbits++) {
378 md.options = PTLRPC_MD_OPTIONS |
379 (ptlrpc_is_bulk_op_get(desc->bd_type) ?
380 LNET_MD_OP_GET : LNET_MD_OP_PUT);
381 ptlrpc_fill_bulk_md(&md, desc, posted_md);
383 if (posted_md > 0 && posted_md + 1 == desc->bd_md_count &&
384 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) {
387 me = LNetMEAttach(desc->bd_portal, &peer, mbits, 0,
388 LNET_UNLINK, LNET_INS_AFTER);
389 rc = PTR_ERR_OR_ZERO(me);
392 CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
393 desc->bd_import->imp_obd->obd_name, mbits,
397 percpu_ref_get(&ptlrpc_pending);
399 /* About to let the network at it... */
400 rc = LNetMDAttach(me, &md, LNET_UNLINK,
401 &desc->bd_mds[posted_md]);
403 CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
404 desc->bd_import->imp_obd->obd_name, mbits,
411 LASSERT(rc == -ENOMEM);
412 spin_lock(&desc->bd_lock);
413 desc->bd_refs -= total_md - posted_md;
414 spin_unlock(&desc->bd_lock);
415 LASSERT(desc->bd_refs >= 0);
416 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
417 req->rq_status = -ENOMEM;
418 desc->bd_registered = 0;
422 spin_lock(&desc->bd_lock);
423 /* Holler if peer manages to touch buffers before he knows the mbits */
424 if (desc->bd_refs != total_md)
425 CWARN("%s: Peer %s touched %d buffers while I registered\n",
426 desc->bd_import->imp_obd->obd_name, libcfs_idstr(&peer),
427 total_md - desc->bd_refs);
428 spin_unlock(&desc->bd_lock);
431 "Setup %u bulk %s buffers: %u pages %u bytes, mbits x%#llx-%#llx, portal %u\n",
433 ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
434 desc->bd_iov_count, desc->bd_nob,
435 desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
441 * Disconnect a bulk desc from the network. Idempotent. Not
442 * thread-safe (i.e. only interlocks with completion callback).
443 * Returns 1 on success or 0 if network unregistration failed for whatever
446 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
448 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
451 LASSERT(!in_interrupt()); /* might sleep */
454 desc->bd_registered = 0;
456 /* Let's setup deadline for reply unlink. */
457 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
458 async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
459 req->rq_bulk_deadline = ktime_get_real_seconds() +
460 PTLRPC_REQ_LONG_UNLINK;
462 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
463 RETURN(1); /* never registered */
465 LASSERT(desc->bd_req == req); /* bd_req NULL until registered */
467 /* the unlink ensures the callback happens ASAP and is the last
468 * one. If it fails, it must be because completion just happened,
469 * but we must still wait_event_idle_timeout() in this case to give
470 * us a chance to run client_bulk_callback()
472 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
474 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
475 RETURN(1); /* never registered */
477 /* Move to "Unregistering" phase as bulk was not unlinked yet. */
478 ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
480 /* Do not wait for unlink to finish. */
485 /* The wq argument is ignored by user-space wait_event macros */
486 wait_queue_head_t *wq = (req->rq_set != NULL) ?
487 &req->rq_set->set_waitq :
488 &req->rq_reply_waitq;
490 * Network access will complete in finite time but the HUGE
491 * timeout lets us CWARN for visibility of sluggish NALs.
493 int seconds = PTLRPC_REQ_LONG_UNLINK;
495 while (seconds > 0 &&
496 wait_event_idle_timeout(*wq,
497 !ptlrpc_client_bulk_active(req),
498 cfs_time_seconds(1)) == 0)
501 ptlrpc_rqphase_move(req, req->rq_next_phase);
505 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
511 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
513 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
514 struct ptlrpc_service *svc = svcpt->scp_service;
515 timeout_t service_timeout;
517 service_timeout = clamp_t(timeout_t, ktime_get_real_seconds() -
518 req->rq_arrival_time.tv_sec, 1,
519 (AT_OFF ? obd_timeout * 3 / 2 : at_max));
520 if (!(flags & PTLRPC_REPLY_EARLY) &&
521 (req->rq_type != PTL_RPC_MSG_ERR) &&
522 (req->rq_reqmsg != NULL) &&
523 !(lustre_msg_get_flags(req->rq_reqmsg) &
524 (MSG_RESENT | MSG_REPLAY |
525 MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
526 /* early replies, errors and recovery requests don't count
527 * toward our service time estimate
529 timeout_t oldse = at_measured(&svcpt->scp_at_estimate,
533 DEBUG_REQ(D_ADAPTTO, req,
534 "svc %s changed estimate from %d to %d",
535 svc->srv_name, oldse,
536 at_get(&svcpt->scp_at_estimate));
539 /* Report actual service time for client latency calc */
540 lustre_msg_set_service_timeout(req->rq_repmsg, service_timeout);
541 /* Report service time estimate for future client reqs, but report 0
542 * (to be ignored by client) if it's an error reply during recovery.
545 if (req->rq_type == PTL_RPC_MSG_ERR &&
546 (req->rq_export == NULL ||
547 req->rq_export->exp_obd->obd_recovering)) {
548 lustre_msg_set_timeout(req->rq_repmsg, 0);
552 if (req->rq_export && req->rq_reqmsg != NULL &&
553 (flags & PTLRPC_REPLY_EARLY) &&
554 lustre_msg_get_flags(req->rq_reqmsg) &
555 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
556 struct obd_device *exp_obd = req->rq_export->exp_obd;
558 timeout = ktime_get_real_seconds() -
559 req->rq_arrival_time.tv_sec +
560 min_t(timeout_t, at_extra,
561 exp_obd->obd_recovery_timeout / 4);
563 timeout = at_get(&svcpt->scp_at_estimate);
565 lustre_msg_set_timeout(req->rq_repmsg, timeout);
568 if (req->rq_reqmsg &&
569 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
570 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
571 "req_flags=%#x magic=%x/%x len=%d\n",
572 flags, lustre_msg_get_flags(req->rq_reqmsg),
573 lustre_msg_get_magic(req->rq_reqmsg),
574 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
579 * Send request reply from request \a req reply buffer.
580 * \a flags defines reply types
581 * Returns 0 on success or error code
583 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
585 struct ptlrpc_reply_state *rs = req->rq_reply_state;
586 struct ptlrpc_connection *conn;
589 /* We must already have a reply buffer (only ptlrpc_error() may be
590 * called without one). The reply generated by sptlrpc layer (e.g.
591 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
592 * have a request buffer which is either the actual (swabbed) incoming
593 * request, or a saved copy if this is a req saved in
594 * target_queue_final_reply().
596 LASSERT (req->rq_no_reply == 0);
597 LASSERT (req->rq_reqbuf != NULL);
598 LASSERT (rs != NULL);
599 LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
600 LASSERT (req->rq_repmsg != NULL);
601 LASSERT (req->rq_repmsg == rs->rs_msg);
602 LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
603 LASSERT (rs->rs_cb_id.cbid_arg == rs);
605 /* There may be no rq_export during failover */
607 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
608 req->rq_export->exp_obd->obd_fail)) {
609 /* Failed obd's only send ENODEV */
610 req->rq_type = PTL_RPC_MSG_ERR;
611 req->rq_status = -ENODEV;
612 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
613 req->rq_export->exp_obd->obd_minor);
616 if (req->rq_type != PTL_RPC_MSG_ERR)
617 req->rq_type = PTL_RPC_MSG_REPLY;
619 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
620 lustre_msg_set_status(req->rq_repmsg,
621 ptlrpc_status_hton(req->rq_status));
622 lustre_msg_set_opc(req->rq_repmsg,
623 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
625 target_pack_pool_reply(req);
627 ptlrpc_at_set_reply(req, flags);
629 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
630 conn = ptlrpc_connection_get(&req->rq_peer, &req->rq_self,
633 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
635 if (unlikely(conn == NULL)) {
636 CERROR("not replying on NULL connection\n"); /* bug 9635 */
639 ptlrpc_rs_addref(rs); /* +1 ref for the network */
641 rc = sptlrpc_svc_wrap_reply(req);
645 req->rq_sent = ktime_get_real_seconds();
647 rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
648 (rs->rs_difficult && !rs->rs_no_ack) ?
649 LNET_ACK_REQ : LNET_NOACK_REQ,
650 &rs->rs_cb_id, lnet_nid_to_nid4(&req->rq_self),
652 ptlrpc_req2svc(req)->srv_rep_portal,
653 req->rq_rep_mbits ? req->rq_rep_mbits : req->rq_xid,
654 req->rq_reply_off, NULL);
656 if (unlikely(rc != 0))
657 ptlrpc_req_drop_rs(req);
658 ptlrpc_connection_put(conn);
662 int ptlrpc_reply (struct ptlrpc_request *req)
664 if (req->rq_no_reply)
667 return (ptlrpc_send_reply(req, 0));
671 * For request \a req send an error reply back. Create empty
672 * reply buffers if necessary.
674 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
679 if (req->rq_no_reply)
682 if (!req->rq_repmsg) {
683 rc = lustre_pack_reply(req, 1, NULL, NULL);
688 if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
689 req->rq_status != -EPERM && req->rq_status != -ENOENT &&
690 req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT &&
691 req->rq_status != -EROFS)
692 req->rq_type = PTL_RPC_MSG_ERR;
694 rc = ptlrpc_send_reply(req, may_be_difficult);
698 int ptlrpc_error(struct ptlrpc_request *req)
700 return ptlrpc_send_error(req, 0);
704 * Send request \a request.
705 * if \a noreply is set, don't expect any reply back and don't set up
707 * Returns 0 on success or error code.
709 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
714 bool rep_mbits = false;
715 struct lnet_handle_md bulk_cookie;
716 struct lnet_processid peer;
717 struct ptlrpc_connection *connection;
718 struct lnet_me *reply_me = NULL;
719 struct lnet_md reply_md;
720 struct obd_import *imp = request->rq_import;
721 struct obd_device *obd = imp->imp_obd;
724 LNetInvalidateMDHandle(&bulk_cookie);
726 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
729 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DELAY_RECOV) &&
730 lustre_msg_get_opc(request->rq_reqmsg) == MDS_CONNECT &&
731 strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) == 0)) {
735 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
736 LASSERT(request->rq_wait_ctx == 0);
738 /* If this is a re-transmit, we're required to have disengaged
739 * cleanly from the previous attempt */
740 LASSERT(!request->rq_receiving_reply);
741 LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
742 (imp->imp_state == LUSTRE_IMP_FULL)));
744 if (unlikely(obd != NULL && obd->obd_fail)) {
745 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
747 /* this prevents us from waiting in ptlrpc_queue_wait */
748 spin_lock(&request->rq_lock);
750 spin_unlock(&request->rq_lock);
751 request->rq_status = -ENODEV;
755 connection = imp->imp_connection;
757 lustre_msg_set_handle(request->rq_reqmsg,
758 &imp->imp_remote_handle);
759 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
760 lustre_msg_set_conn_cnt(request->rq_reqmsg,
762 lustre_msghdr_set_flags(request->rq_reqmsg,
763 imp->imp_msghdr_flags);
765 /* If it's the first time to resend the request for EINPROGRESS,
766 * we need to allocate a new XID (see after_reply()), it's different
767 * from the resend for reply timeout. */
768 if (request->rq_nr_resend != 0 &&
769 list_empty(&request->rq_unreplied_list)) {
771 /* resend for EINPROGRESS, allocate new xid to avoid reply
773 spin_lock(&imp->imp_lock);
774 ptlrpc_assign_next_xid_nolock(request);
775 min_xid = ptlrpc_known_replied_xid(imp);
776 spin_unlock(&imp->imp_lock);
778 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
779 DEBUG_REQ(D_RPCTRACE, request,
780 "Allocating new XID for resend on EINPROGRESS");
783 opc = lustre_msg_get_opc(request->rq_reqmsg);
784 if (opc != OST_CONNECT && opc != MDS_CONNECT &&
785 opc != MGS_CONNECT && OCD_HAS_FLAG(&imp->imp_connect_data, FLAGS2))
786 rep_mbits = imp->imp_connect_data.ocd_connect_flags2 &
787 OBD_CONNECT2_REP_MBITS;
789 if ((request->rq_bulk != NULL) || rep_mbits) {
790 ptlrpc_set_mbits(request);
791 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
794 if (list_empty(&request->rq_unreplied_list) ||
795 request->rq_xid <= imp->imp_known_replied_xid) {
796 DEBUG_REQ(D_ERROR, request,
797 "xid=%llu, replied=%llu, list_empty=%d",
798 request->rq_xid, imp->imp_known_replied_xid,
799 list_empty(&request->rq_unreplied_list));
803 /** For enabled AT all request should have AT_SUPPORT in the
804 * FULL import state when OBD_CONNECT_AT is set */
805 LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
806 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
807 !(imp->imp_connect_data.ocd_connect_flags &
810 if (request->rq_resend) {
811 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
812 if (request->rq_resend_cb != NULL)
813 request->rq_resend_cb(request, &request->rq_async_args);
815 if (request->rq_memalloc)
816 mpflag = memalloc_noreclaim_save();
818 rc = sptlrpc_cli_wrap_request(request);
822 /* bulk register should be done after wrap_request() */
823 if (request->rq_bulk != NULL) {
824 rc = ptlrpc_register_bulk (request);
826 GOTO(cleanup_bulk, rc);
828 * All the mds in the request will have the same cpt
829 * encoded in the cookie. So we can just get the first
832 bulk_cookie = request->rq_bulk->bd_mds[0];
836 LASSERT (request->rq_replen != 0);
837 if (request->rq_repbuf == NULL) {
838 LASSERT(request->rq_repdata == NULL);
839 LASSERT(request->rq_repmsg == NULL);
840 rc = sptlrpc_cli_alloc_repbuf(request,
843 /* this prevents us from looping in
844 * ptlrpc_queue_wait */
845 spin_lock(&request->rq_lock);
847 spin_unlock(&request->rq_lock);
848 request->rq_status = rc;
849 GOTO(cleanup_bulk, rc);
852 request->rq_repdata = NULL;
853 request->rq_repmsg = NULL;
856 peer = connection->c_peer;
857 if (request->rq_bulk &&
858 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_REPLY_ATTACH)) {
859 reply_me = ERR_PTR(-ENOMEM);
861 reply_me = LNetMEAttach(request->rq_reply_portal,
863 rep_mbits ? request->rq_mbits :
865 0, LNET_UNLINK, LNET_INS_AFTER);
868 if (IS_ERR(reply_me)) {
869 rc = PTR_ERR(reply_me);
870 CERROR("LNetMEAttach failed: %d\n", rc);
871 LASSERT(rc == -ENOMEM);
872 GOTO(cleanup_bulk, rc = -ENOMEM);
876 spin_lock(&request->rq_lock);
877 /* We are responsible for unlinking the reply buffer */
878 request->rq_reply_unlinked = noreply;
879 request->rq_receiving_reply = !noreply;
880 /* Clear any flags that may be present from previous sends. */
881 request->rq_req_unlinked = 0;
882 request->rq_replied = 0;
884 request->rq_timedout = 0;
885 request->rq_net_err = 0;
886 request->rq_resend = 0;
887 request->rq_restart = 0;
888 request->rq_reply_truncated = 0;
889 spin_unlock(&request->rq_lock);
892 reply_md.start = request->rq_repbuf;
893 reply_md.length = request->rq_repbuf_len;
894 /* Allow multiple early replies */
895 reply_md.threshold = LNET_MD_THRESH_INF;
896 /* Manage remote for early replies */
897 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
898 LNET_MD_MANAGE_REMOTE |
899 LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
900 reply_md.user_ptr = &request->rq_reply_cbid;
901 reply_md.handler = ptlrpc_handler;
903 /* We must see the unlink callback to set rq_reply_unlinked,
904 * so we can't auto-unlink */
905 rc = LNetMDAttach(reply_me, &reply_md, LNET_RETAIN,
906 &request->rq_reply_md_h);
908 CERROR("LNetMDAttach failed: %d\n", rc);
909 LASSERT(rc == -ENOMEM);
910 spin_lock(&request->rq_lock);
911 /* ...but the MD attach didn't succeed... */
912 request->rq_receiving_reply = 0;
913 spin_unlock(&request->rq_lock);
914 GOTO(cleanup_bulk, rc = -ENOMEM);
916 percpu_ref_get(&ptlrpc_pending);
919 "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
920 request->rq_repbuf_len, request->rq_xid,
921 request->rq_reply_portal);
924 /* add references on request for request_out_callback */
925 ptlrpc_request_addref(request);
926 if (obd != NULL && obd->obd_svc_stats != NULL)
927 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
928 atomic_read(&imp->imp_inflight));
930 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
932 request->rq_sent_ns = ktime_get_real();
933 request->rq_sent = ktime_get_real_seconds();
934 /* We give the server rq_timeout secs to process the req, and
935 * add the network latency for our local timeout.
937 request->rq_deadline = request->rq_sent + request->rq_timeout +
938 ptlrpc_at_get_net_latency(request);
940 DEBUG_REQ(D_INFO, request, "send flags=%x",
941 lustre_msg_get_flags(request->rq_reqmsg));
942 rc = ptl_send_buf(&request->rq_req_md_h,
943 request->rq_reqbuf, request->rq_reqdata_len,
944 LNET_NOACK_REQ, &request->rq_req_cbid,
947 request->rq_request_portal,
948 request->rq_xid, 0, &bulk_cookie);
952 request->rq_req_unlinked = 1;
953 ptlrpc_req_finished(request);
957 LNetMDUnlink(request->rq_reply_md_h);
959 /* UNLINKED callback called synchronously */
960 LASSERT(!request->rq_receiving_reply);
963 /* We do sync unlink here as there was no real transfer here so
964 * the chance to have long unlink to sluggish net is smaller here. */
965 ptlrpc_unregister_bulk(request, 0);
968 /* set rq_sent so that this request is treated
969 * as a delayed send in the upper layers */
970 request->rq_sent = ktime_get_real_seconds();
973 if (request->rq_memalloc)
974 memalloc_noreclaim_restore(mpflag);
978 EXPORT_SYMBOL(ptl_send_rpc);
981 * Register request buffer descriptor for request receiving.
983 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
985 struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
986 static struct lnet_processid match_id = {
994 CDEBUG(D_NET, "%s: registering portal %d\n", service->srv_name,
995 service->srv_req_portal);
997 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
1000 /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
1001 * which means buffer can only be attached on local CPT, and LND
1002 * threads can find it by grabbing a local lock */
1003 me = LNetMEAttach(service->srv_req_portal,
1004 &match_id, 0, ~0, LNET_UNLINK,
1005 rqbd->rqbd_svcpt->scp_cpt >= 0 ?
1006 LNET_INS_LOCAL : LNET_INS_AFTER);
1008 CERROR("%s: LNetMEAttach failed: rc = %ld\n",
1009 service->srv_name, PTR_ERR(me));
1013 LASSERT(rqbd->rqbd_refcount == 0);
1014 rqbd->rqbd_refcount = 1;
1016 md.start = rqbd->rqbd_buffer;
1017 md.length = service->srv_buf_size;
1018 md.max_size = service->srv_max_req_size;
1019 md.threshold = LNET_MD_THRESH_INF;
1020 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
1021 md.user_ptr = &rqbd->rqbd_cbid;
1022 md.handler = ptlrpc_handler;
1024 rc = LNetMDAttach(me, &md, LNET_UNLINK, &rqbd->rqbd_md_h);
1026 percpu_ref_get(&ptlrpc_pending);
1030 CERROR("%s: LNetMDAttach failed: rc = %d\n", service->srv_name, rc);
1031 LASSERT(rc == -ENOMEM);
1032 rqbd->rqbd_refcount = 0;