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 <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 static void mdunlink_iterate_helper(struct lnet_handle_md *bd_mds, int count)
110 for (i = 0; i < count; i++)
111 LNetMDUnlink(bd_mds[i]);
114 #ifdef HAVE_SERVER_SUPPORT
116 * Prepare bulk descriptor for specified incoming request \a req that
117 * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
118 * the bulk to be sent. Used on server-side after request was already
120 * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
123 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
124 unsigned nfrags, unsigned max_brw,
127 const struct ptlrpc_bulk_frag_ops
130 struct obd_export *exp = req->rq_export;
131 struct ptlrpc_bulk_desc *desc;
134 LASSERT(ptlrpc_is_bulk_op_active(type));
136 desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
140 desc->bd_export = class_export_get(exp);
143 desc->bd_cbid.cbid_fn = server_bulk_callback;
144 desc->bd_cbid.cbid_arg = desc;
146 /* NB we don't assign rq_bulk here; server-side requests are
147 * re-used, and the handler frees the bulk desc explicitly. */
151 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
154 * Starts bulk transfer for descriptor \a desc on the server.
155 * Returns 0 on success or error code.
157 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
159 struct obd_export *exp = desc->bd_export;
161 struct lnet_process_id peer_id;
169 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
172 /* NB no locking required until desc is on the network */
173 LASSERT(desc->bd_md_count == 0);
174 LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
176 LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
177 LASSERT(desc->bd_cbid.cbid_arg == desc);
180 * Multi-Rail: get the preferred self and peer NIDs from the
181 * request, so they are based on the route taken by the
184 self_nid = desc->bd_req->rq_self;
185 peer_id = desc->bd_req->rq_source;
187 /* NB total length may be 0 for a read past EOF, so we send 0
188 * length bulks, since the client expects bulk events.
190 * The client may not need all of the bulk mbits for the RPC. The RPC
191 * used the mbits of the highest bulk mbits needed, and the server masks
192 * off high bits to get bulk count for this RPC. LU-1431 */
193 mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
194 total_md = desc->bd_req->rq_mbits - mbits + 1;
196 desc->bd_md_count = total_md;
197 desc->bd_failure = 0;
199 md.user_ptr = &desc->bd_cbid;
200 md.handler = ptlrpc_handler;
201 md.threshold = 2; /* SENT and ACK/REPLY */
203 for (posted_md = 0; posted_md < total_md; mbits++) {
204 md.options = PTLRPC_MD_OPTIONS;
206 /* NB it's assumed that source and sink buffer frags are
207 * page-aligned. Otherwise we'd have to send client bulk
208 * sizes over and split server buffer accordingly */
209 ptlrpc_fill_bulk_md(&md, desc, posted_md);
210 rc = LNetMDBind(md, LNET_UNLINK, &desc->bd_mds[posted_md]);
212 CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n",
213 exp->exp_obd->obd_name, posted_md, rc);
214 LASSERT(rc == -ENOMEM);
215 if (posted_md == 0) {
216 desc->bd_md_count = 0;
221 percpu_ref_get(&ptlrpc_pending);
223 /* sanity.sh 224c: lets skip last md */
224 if (posted_md == desc->bd_md_max_brw - 1)
225 OBD_FAIL_CHECK_RESET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3,
226 CFS_FAIL_PTLRPC_OST_BULK_CB2);
228 /* Network is about to get at the memory */
229 if (ptlrpc_is_bulk_put_source(desc->bd_type))
230 rc = LNetPut(self_nid, desc->bd_mds[posted_md],
231 LNET_ACK_REQ, peer_id,
232 desc->bd_portal, mbits, 0, 0);
234 rc = LNetGet(self_nid, desc->bd_mds[posted_md],
235 peer_id, desc->bd_portal, mbits, 0, false);
239 CERROR("%s: failed bulk transfer with %s:%u x%llu: "
240 "rc = %d\n", exp->exp_obd->obd_name,
241 libcfs_id2str(peer_id), desc->bd_portal,
248 /* Can't send, so we unlink the MD bound above. The UNLINK
249 * event this creates will signal completion with failure,
250 * so we return SUCCESS here! */
251 spin_lock(&desc->bd_lock);
252 desc->bd_md_count -= total_md - posted_md;
253 spin_unlock(&desc->bd_lock);
254 LASSERT(desc->bd_md_count >= 0);
256 mdunlink_iterate_helper(desc->bd_mds, posted_md);
260 CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
261 "id %s mbits %#llx-%#llx\n", desc->bd_iov_count,
262 desc->bd_nob, desc->bd_portal, libcfs_id2str(peer_id),
263 mbits - posted_md, mbits - 1);
269 * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
270 * serialises with completion callback)
272 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
274 LASSERT(!in_interrupt()); /* might sleep */
276 if (!ptlrpc_server_bulk_active(desc)) /* completed or */
277 return; /* never started */
279 /* We used to poison the pages with 0xab here because we did not want to
280 * send any meaningful data over the wire for evicted clients (bug 9297)
281 * However, this is no longer safe now that we use the page cache on the
284 /* The unlink ensures the callback happens ASAP and is the last
285 * one. If it fails, it must be because completion just happened,
286 * but we must still wait_event_idle_timeout() in this case, to give
287 * us a chance to run server_bulk_callback()
289 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
292 /* Network access will complete in finite time but the HUGE
293 * timeout lets us CWARN for visibility of sluggish NALs */
294 int seconds = LONG_UNLINK;
296 while (seconds > 0 &&
297 wait_event_idle_timeout(desc->bd_waitq,
298 !ptlrpc_server_bulk_active(desc),
299 cfs_time_seconds(1)) == 0)
304 CWARN("Unexpectedly long timeout: desc %p\n", desc);
307 #endif /* HAVE_SERVER_SUPPORT */
310 * Register bulk at the sender for later transfer.
311 * Returns 0 on success or error code.
313 int ptlrpc_register_bulk(struct ptlrpc_request *req)
315 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
316 struct lnet_process_id peer;
325 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
328 /* NB no locking required until desc is on the network */
329 LASSERT(desc->bd_nob > 0);
330 LASSERT(desc->bd_md_count == 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 = desc->bd_import->imp_connection->c_peer;
349 LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
350 LASSERT(desc->bd_cbid.cbid_arg == desc);
352 total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
353 /* rq_mbits is matchbits of the final bulk */
354 mbits = req->rq_mbits - total_md + 1;
356 LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK),
357 "first mbits = x%llu, last mbits = x%llu\n",
358 mbits, req->rq_mbits);
359 LASSERTF(!(desc->bd_registered &&
360 req->rq_send_state != LUSTRE_IMP_REPLAY) ||
361 mbits != desc->bd_last_mbits,
362 "registered: %d rq_mbits: %llu bd_last_mbits: %llu\n",
363 desc->bd_registered, mbits, desc->bd_last_mbits);
365 desc->bd_registered = 1;
366 desc->bd_last_mbits = mbits;
367 desc->bd_md_count = total_md;
368 md.user_ptr = &desc->bd_cbid;
369 md.handler = ptlrpc_handler;
370 md.threshold = 1; /* PUT or GET */
372 for (posted_md = 0; posted_md < total_md; posted_md++, mbits++) {
373 md.options = PTLRPC_MD_OPTIONS |
374 (ptlrpc_is_bulk_op_get(desc->bd_type) ?
375 LNET_MD_OP_GET : LNET_MD_OP_PUT);
376 ptlrpc_fill_bulk_md(&md, desc, posted_md);
378 if (posted_md > 0 && posted_md + 1 == total_md &&
379 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) {
382 me = LNetMEAttach(desc->bd_portal, peer, mbits, 0,
383 LNET_UNLINK, LNET_INS_AFTER);
384 rc = PTR_ERR_OR_ZERO(me);
387 CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
388 desc->bd_import->imp_obd->obd_name, mbits,
392 percpu_ref_get(&ptlrpc_pending);
394 /* About to let the network at it... */
395 rc = LNetMDAttach(me, md, LNET_UNLINK,
396 &desc->bd_mds[posted_md]);
398 CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
399 desc->bd_import->imp_obd->obd_name, mbits,
407 LASSERT(rc == -ENOMEM);
408 spin_lock(&desc->bd_lock);
409 desc->bd_md_count -= total_md - posted_md;
410 spin_unlock(&desc->bd_lock);
411 LASSERT(desc->bd_md_count >= 0);
412 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
413 req->rq_status = -ENOMEM;
414 desc->bd_registered = 0;
418 spin_lock(&desc->bd_lock);
419 /* Holler if peer manages to touch buffers before he knows the mbits */
420 if (desc->bd_md_count != total_md)
421 CWARN("%s: Peer %s touched %d buffers while I registered\n",
422 desc->bd_import->imp_obd->obd_name, libcfs_id2str(peer),
423 total_md - desc->bd_md_count);
424 spin_unlock(&desc->bd_lock);
426 CDEBUG(D_NET, "Setup %u bulk %s buffers: %u pages %u bytes, "
427 "mbits x%#llx-%#llx, portal %u\n", desc->bd_md_count,
428 ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
429 desc->bd_iov_count, desc->bd_nob,
430 desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
436 * Disconnect a bulk desc from the network. Idempotent. Not
437 * thread-safe (i.e. only interlocks with completion callback).
438 * Returns 1 on success or 0 if network unregistration failed for whatever
441 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
443 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
446 LASSERT(!in_interrupt()); /* might sleep */
448 /* Let's setup deadline for reply unlink. */
449 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
450 async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
451 req->rq_bulk_deadline = ktime_get_real_seconds() + LONG_UNLINK;
453 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
454 RETURN(1); /* never registered */
456 LASSERT(desc->bd_req == req); /* bd_req NULL until registered */
458 /* the unlink ensures the callback happens ASAP and is the last
459 * one. If it fails, it must be because completion just happened,
460 * but we must still wait_event_idle_timeout() in this case to give
461 * us a chance to run client_bulk_callback()
463 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
465 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
466 RETURN(1); /* never registered */
468 /* Move to "Unregistering" phase as bulk was not unlinked yet. */
469 ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
471 /* Do not wait for unlink to finish. */
476 /* The wq argument is ignored by user-space wait_event macros */
477 wait_queue_head_t *wq = (req->rq_set != NULL) ?
478 &req->rq_set->set_waitq :
479 &req->rq_reply_waitq;
481 * Network access will complete in finite time but the HUGE
482 * timeout lets us CWARN for visibility of sluggish NALs.
484 int seconds = LONG_UNLINK;
486 while (seconds > 0 &&
487 wait_event_idle_timeout(*wq,
488 !ptlrpc_client_bulk_active(req),
489 cfs_time_seconds(1)) == 0)
492 ptlrpc_rqphase_move(req, req->rq_next_phase);
496 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
502 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
504 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
505 struct ptlrpc_service *svc = svcpt->scp_service;
506 timeout_t service_timeout;
508 service_timeout = clamp_t(timeout_t, ktime_get_real_seconds() -
509 req->rq_arrival_time.tv_sec, 1,
510 (AT_OFF ? obd_timeout * 3 / 2 : at_max));
511 if (!(flags & PTLRPC_REPLY_EARLY) &&
512 (req->rq_type != PTL_RPC_MSG_ERR) &&
513 (req->rq_reqmsg != NULL) &&
514 !(lustre_msg_get_flags(req->rq_reqmsg) &
515 (MSG_RESENT | MSG_REPLAY |
516 MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
517 /* early replies, errors and recovery requests don't count
518 * toward our service time estimate
520 timeout_t oldse = at_measured(&svcpt->scp_at_estimate,
524 DEBUG_REQ(D_ADAPTTO, req,
525 "svc %s changed estimate from %d to %d",
526 svc->srv_name, oldse,
527 at_get(&svcpt->scp_at_estimate));
530 /* Report actual service time for client latency calc */
531 lustre_msg_set_service_timeout(req->rq_repmsg, service_timeout);
532 /* Report service time estimate for future client reqs, but report 0
533 * (to be ignored by client) if it's an error reply during recovery.
536 if (req->rq_type == PTL_RPC_MSG_ERR &&
537 (req->rq_export == NULL ||
538 req->rq_export->exp_obd->obd_recovering)) {
539 lustre_msg_set_timeout(req->rq_repmsg, 0);
543 if (req->rq_export && req->rq_reqmsg != NULL &&
544 (flags & PTLRPC_REPLY_EARLY) &&
545 lustre_msg_get_flags(req->rq_reqmsg) &
546 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
547 struct obd_device *exp_obd = req->rq_export->exp_obd;
549 timeout = ktime_get_real_seconds() -
550 req->rq_arrival_time.tv_sec +
551 min_t(timeout_t, at_extra,
552 exp_obd->obd_recovery_timeout / 4);
554 timeout = at_get(&svcpt->scp_at_estimate);
556 lustre_msg_set_timeout(req->rq_repmsg, timeout);
559 if (req->rq_reqmsg &&
560 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
561 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
562 "req_flags=%#x magic=%x/%x len=%d\n",
563 flags, lustre_msg_get_flags(req->rq_reqmsg),
564 lustre_msg_get_magic(req->rq_reqmsg),
565 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
570 * Send request reply from request \a req reply buffer.
571 * \a flags defines reply types
572 * Returns 0 on success or error code
574 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
576 struct ptlrpc_reply_state *rs = req->rq_reply_state;
577 struct ptlrpc_connection *conn;
580 /* We must already have a reply buffer (only ptlrpc_error() may be
581 * called without one). The reply generated by sptlrpc layer (e.g.
582 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
583 * have a request buffer which is either the actual (swabbed) incoming
584 * request, or a saved copy if this is a req saved in
585 * target_queue_final_reply().
587 LASSERT (req->rq_no_reply == 0);
588 LASSERT (req->rq_reqbuf != NULL);
589 LASSERT (rs != NULL);
590 LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
591 LASSERT (req->rq_repmsg != NULL);
592 LASSERT (req->rq_repmsg == rs->rs_msg);
593 LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
594 LASSERT (rs->rs_cb_id.cbid_arg == rs);
596 /* There may be no rq_export during failover */
598 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
599 req->rq_export->exp_obd->obd_fail)) {
600 /* Failed obd's only send ENODEV */
601 req->rq_type = PTL_RPC_MSG_ERR;
602 req->rq_status = -ENODEV;
603 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
604 req->rq_export->exp_obd->obd_minor);
607 if (req->rq_type != PTL_RPC_MSG_ERR)
608 req->rq_type = PTL_RPC_MSG_REPLY;
610 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
611 lustre_msg_set_status(req->rq_repmsg,
612 ptlrpc_status_hton(req->rq_status));
613 lustre_msg_set_opc(req->rq_repmsg,
614 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
616 target_pack_pool_reply(req);
618 ptlrpc_at_set_reply(req, flags);
620 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
621 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
623 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
625 if (unlikely(conn == NULL)) {
626 CERROR("not replying on NULL connection\n"); /* bug 9635 */
629 ptlrpc_rs_addref(rs); /* +1 ref for the network */
631 rc = sptlrpc_svc_wrap_reply(req);
635 req->rq_sent = ktime_get_real_seconds();
637 rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
638 (rs->rs_difficult && !rs->rs_no_ack) ?
639 LNET_ACK_REQ : LNET_NOACK_REQ,
640 &rs->rs_cb_id, req->rq_self, req->rq_source,
641 ptlrpc_req2svc(req)->srv_rep_portal,
642 req->rq_xid, req->rq_reply_off, NULL);
644 if (unlikely(rc != 0))
645 ptlrpc_req_drop_rs(req);
646 ptlrpc_connection_put(conn);
650 int ptlrpc_reply (struct ptlrpc_request *req)
652 if (req->rq_no_reply)
655 return (ptlrpc_send_reply(req, 0));
659 * For request \a req send an error reply back. Create empty
660 * reply buffers if necessary.
662 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
667 if (req->rq_no_reply)
670 if (!req->rq_repmsg) {
671 rc = lustre_pack_reply(req, 1, NULL, NULL);
676 if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
677 req->rq_status != -EPERM && req->rq_status != -ENOENT &&
678 req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
679 req->rq_type = PTL_RPC_MSG_ERR;
681 rc = ptlrpc_send_reply(req, may_be_difficult);
685 int ptlrpc_error(struct ptlrpc_request *req)
687 return ptlrpc_send_error(req, 0);
691 * Send request \a request.
692 * if \a noreply is set, don't expect any reply back and don't set up
694 * Returns 0 on success or error code.
696 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
700 struct lnet_handle_md bulk_cookie;
701 struct ptlrpc_connection *connection;
702 struct lnet_me *reply_me = NULL;
703 struct lnet_md reply_md;
704 struct obd_import *imp = request->rq_import;
705 struct obd_device *obd = imp->imp_obd;
708 LNetInvalidateMDHandle(&bulk_cookie);
710 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
713 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
714 LASSERT(request->rq_wait_ctx == 0);
716 /* If this is a re-transmit, we're required to have disengaged
717 * cleanly from the previous attempt */
718 LASSERT(!request->rq_receiving_reply);
719 LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
720 (imp->imp_state == LUSTRE_IMP_FULL)));
722 if (unlikely(obd != NULL && obd->obd_fail)) {
723 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
725 /* this prevents us from waiting in ptlrpc_queue_wait */
726 spin_lock(&request->rq_lock);
728 spin_unlock(&request->rq_lock);
729 request->rq_status = -ENODEV;
733 connection = imp->imp_connection;
735 lustre_msg_set_handle(request->rq_reqmsg,
736 &imp->imp_remote_handle);
737 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
738 lustre_msg_set_conn_cnt(request->rq_reqmsg,
740 lustre_msghdr_set_flags(request->rq_reqmsg,
741 imp->imp_msghdr_flags);
743 /* If it's the first time to resend the request for EINPROGRESS,
744 * we need to allocate a new XID (see after_reply()), it's different
745 * from the resend for reply timeout. */
746 if (request->rq_nr_resend != 0 &&
747 list_empty(&request->rq_unreplied_list)) {
749 /* resend for EINPROGRESS, allocate new xid to avoid reply
751 spin_lock(&imp->imp_lock);
752 ptlrpc_assign_next_xid_nolock(request);
753 min_xid = ptlrpc_known_replied_xid(imp);
754 spin_unlock(&imp->imp_lock);
756 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
757 DEBUG_REQ(D_RPCTRACE, request,
758 "Allocating new XID for resend on EINPROGRESS");
761 if (request->rq_bulk != NULL) {
762 ptlrpc_set_bulk_mbits(request);
763 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
766 if (list_empty(&request->rq_unreplied_list) ||
767 request->rq_xid <= imp->imp_known_replied_xid) {
768 DEBUG_REQ(D_ERROR, request,
769 "xid=%llu, replied=%llu, list_empty=%d",
770 request->rq_xid, imp->imp_known_replied_xid,
771 list_empty(&request->rq_unreplied_list));
775 /** For enabled AT all request should have AT_SUPPORT in the
776 * FULL import state when OBD_CONNECT_AT is set */
777 LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
778 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
779 !(imp->imp_connect_data.ocd_connect_flags &
782 if (request->rq_resend) {
783 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
784 if (request->rq_resend_cb != NULL)
785 request->rq_resend_cb(request, &request->rq_async_args);
787 if (request->rq_memalloc)
788 mpflag = cfs_memory_pressure_get_and_set();
790 rc = sptlrpc_cli_wrap_request(request);
794 /* bulk register should be done after wrap_request() */
795 if (request->rq_bulk != NULL) {
796 rc = ptlrpc_register_bulk (request);
798 GOTO(cleanup_bulk, rc);
800 * All the mds in the request will have the same cpt
801 * encoded in the cookie. So we can just get the first
804 bulk_cookie = request->rq_bulk->bd_mds[0];
808 LASSERT (request->rq_replen != 0);
809 if (request->rq_repbuf == NULL) {
810 LASSERT(request->rq_repdata == NULL);
811 LASSERT(request->rq_repmsg == NULL);
812 rc = sptlrpc_cli_alloc_repbuf(request,
815 /* this prevents us from looping in
816 * ptlrpc_queue_wait */
817 spin_lock(&request->rq_lock);
819 spin_unlock(&request->rq_lock);
820 request->rq_status = rc;
821 GOTO(cleanup_bulk, rc);
824 request->rq_repdata = NULL;
825 request->rq_repmsg = NULL;
828 reply_me = LNetMEAttach(request->rq_reply_portal,
829 connection->c_peer, request->rq_xid, 0,
830 LNET_UNLINK, LNET_INS_AFTER);
831 if (IS_ERR(reply_me)) {
832 rc = PTR_ERR(reply_me);
833 CERROR("LNetMEAttach failed: %d\n", rc);
834 LASSERT(rc == -ENOMEM);
835 GOTO(cleanup_bulk, rc = -ENOMEM);
839 spin_lock(&request->rq_lock);
840 /* We are responsible for unlinking the reply buffer */
841 request->rq_reply_unlinked = noreply;
842 request->rq_receiving_reply = !noreply;
843 /* Clear any flags that may be present from previous sends. */
844 request->rq_req_unlinked = 0;
845 request->rq_replied = 0;
847 request->rq_timedout = 0;
848 request->rq_net_err = 0;
849 request->rq_resend = 0;
850 request->rq_restart = 0;
851 request->rq_reply_truncated = 0;
852 spin_unlock(&request->rq_lock);
855 reply_md.start = request->rq_repbuf;
856 reply_md.length = request->rq_repbuf_len;
857 /* Allow multiple early replies */
858 reply_md.threshold = LNET_MD_THRESH_INF;
859 /* Manage remote for early replies */
860 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
861 LNET_MD_MANAGE_REMOTE |
862 LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
863 reply_md.user_ptr = &request->rq_reply_cbid;
864 reply_md.handler = ptlrpc_handler;
866 /* We must see the unlink callback to set rq_reply_unlinked,
867 * so we can't auto-unlink */
868 rc = LNetMDAttach(reply_me, reply_md, LNET_RETAIN,
869 &request->rq_reply_md_h);
871 CERROR("LNetMDAttach failed: %d\n", rc);
872 LASSERT(rc == -ENOMEM);
873 spin_lock(&request->rq_lock);
874 /* ...but the MD attach didn't succeed... */
875 request->rq_receiving_reply = 0;
876 spin_unlock(&request->rq_lock);
877 GOTO(cleanup_me, rc = -ENOMEM);
879 percpu_ref_get(&ptlrpc_pending);
882 "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
883 request->rq_repbuf_len, request->rq_xid,
884 request->rq_reply_portal);
887 /* add references on request for request_out_callback */
888 ptlrpc_request_addref(request);
889 if (obd != NULL && obd->obd_svc_stats != NULL)
890 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
891 atomic_read(&imp->imp_inflight));
893 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
895 request->rq_sent_ns = ktime_get_real();
896 request->rq_sent = ktime_get_real_seconds();
897 /* We give the server rq_timeout secs to process the req, and
898 add the network latency for our local timeout. */
899 request->rq_deadline = request->rq_sent + request->rq_timeout +
900 ptlrpc_at_get_net_latency(request);
902 ptlrpc_pinger_sending_on_import(imp);
904 DEBUG_REQ(D_INFO, request, "send flags=%x",
905 lustre_msg_get_flags(request->rq_reqmsg));
906 rc = ptl_send_buf(&request->rq_req_md_h,
907 request->rq_reqbuf, request->rq_reqdata_len,
908 LNET_NOACK_REQ, &request->rq_req_cbid,
909 LNET_NID_ANY, connection->c_peer,
910 request->rq_request_portal,
911 request->rq_xid, 0, &bulk_cookie);
915 request->rq_req_unlinked = 1;
916 ptlrpc_req_finished(request);
921 /* MEUnlink is safe; the PUT didn't even get off the ground, and
922 * nobody apart from the PUT's target has the right nid+XID to
923 * access the reply buffer.
925 LNetMEUnlink(reply_me);
926 /* UNLINKED callback called synchronously */
927 LASSERT(!request->rq_receiving_reply);
930 /* We do sync unlink here as there was no real transfer here so
931 * the chance to have long unlink to sluggish net is smaller here. */
932 ptlrpc_unregister_bulk(request, 0);
933 if (request->rq_bulk != NULL)
934 request->rq_bulk->bd_registered = 0;
937 /* set rq_sent so that this request is treated
938 * as a delayed send in the upper layers */
939 request->rq_sent = ktime_get_real_seconds();
942 if (request->rq_memalloc)
943 cfs_memory_pressure_restore(mpflag);
947 EXPORT_SYMBOL(ptl_send_rpc);
950 * Register request buffer descriptor for request receiving.
952 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
954 struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
955 static struct lnet_process_id match_id = {
963 CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
964 service->srv_req_portal);
966 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
969 /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
970 * which means buffer can only be attached on local CPT, and LND
971 * threads can find it by grabbing a local lock */
972 me = LNetMEAttach(service->srv_req_portal,
973 match_id, 0, ~0, LNET_UNLINK,
974 rqbd->rqbd_svcpt->scp_cpt >= 0 ?
975 LNET_INS_LOCAL : LNET_INS_AFTER);
977 CERROR("LNetMEAttach failed: %ld\n", PTR_ERR(me));
981 LASSERT(rqbd->rqbd_refcount == 0);
982 rqbd->rqbd_refcount = 1;
984 md.start = rqbd->rqbd_buffer;
985 md.length = service->srv_buf_size;
986 md.max_size = service->srv_max_req_size;
987 md.threshold = LNET_MD_THRESH_INF;
988 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
989 md.user_ptr = &rqbd->rqbd_cbid;
990 md.handler = ptlrpc_handler;
992 rc = LNetMDAttach(me, md, LNET_UNLINK, &rqbd->rqbd_md_h);
994 percpu_ref_get(&ptlrpc_pending);
998 CERROR("ptlrpc: LNetMDAttach failed: rc = %d\n", rc);
999 LASSERT(rc == -ENOMEM);
1002 rqbd->rqbd_refcount = 0;