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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2015, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_RPC
38 #include <obd_support.h>
39 #include <lustre_net.h>
40 #include <lustre_lib.h>
42 #include <obd_class.h>
43 #include "ptlrpc_internal.h"
46 * Helper function. Sends \a len bytes from \a base at offset \a offset
47 * over \a conn connection to portal \a portal.
48 * Returns 0 on success or error code.
50 static int ptl_send_buf (lnet_handle_md_t *mdh, void *base, int len,
51 lnet_ack_req_t ack, struct ptlrpc_cb_id *cbid,
52 struct ptlrpc_connection *conn, int portal, __u64 xid,
59 LASSERT (portal != 0);
60 LASSERT (conn != NULL);
61 CDEBUG (D_INFO, "conn=%p id %s\n", conn, libcfs_id2str(conn->c_peer));
64 md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
65 md.options = PTLRPC_MD_OPTIONS;
67 md.eq_handle = ptlrpc_eq_h;
69 if (unlikely(ack == LNET_ACK_REQ &&
70 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
71 /* don't ask for the ack to simulate failing client */
75 rc = LNetMDBind (md, LNET_UNLINK, mdh);
76 if (unlikely(rc != 0)) {
77 CERROR ("LNetMDBind failed: %d\n", rc);
78 LASSERT (rc == -ENOMEM);
82 CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
83 len, portal, xid, offset);
85 rc = LNetPut (conn->c_self, *mdh, ack,
86 conn->c_peer, portal, xid, offset, 0);
87 if (unlikely(rc != 0)) {
89 /* We're going to get an UNLINK event when I unlink below,
90 * which will complete just like any other failed send, so
91 * I fall through and return success here! */
92 CERROR("LNetPut(%s, %d, %lld) failed: %d\n",
93 libcfs_id2str(conn->c_peer), portal, xid, rc);
94 rc2 = LNetMDUnlink(*mdh);
95 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
101 static void mdunlink_iterate_helper(lnet_handle_md_t *bd_mds, int count)
105 for (i = 0; i < count; i++)
106 LNetMDUnlink(bd_mds[i]);
109 #ifdef HAVE_SERVER_SUPPORT
111 * Prepare bulk descriptor for specified incoming request \a req that
112 * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
113 * the bulk to be sent. Used on server-side after request was already
115 * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
118 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
119 unsigned nfrags, unsigned max_brw,
122 const struct ptlrpc_bulk_frag_ops
125 struct obd_export *exp = req->rq_export;
126 struct ptlrpc_bulk_desc *desc;
129 LASSERT(ptlrpc_is_bulk_op_active(type));
131 desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
135 desc->bd_export = class_export_get(exp);
138 desc->bd_cbid.cbid_fn = server_bulk_callback;
139 desc->bd_cbid.cbid_arg = desc;
141 /* NB we don't assign rq_bulk here; server-side requests are
142 * re-used, and the handler frees the bulk desc explicitly. */
146 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
149 * Starts bulk transfer for descriptor \a desc on the server.
150 * Returns 0 on success or error code.
152 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
154 struct obd_export *exp = desc->bd_export;
155 struct ptlrpc_connection *conn = exp->exp_connection;
163 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
166 /* NB no locking required until desc is on the network */
167 LASSERT(desc->bd_md_count == 0);
168 LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
170 LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
171 LASSERT(desc->bd_cbid.cbid_arg == desc);
173 /* NB total length may be 0 for a read past EOF, so we send 0
174 * length bulks, since the client expects bulk events.
176 * The client may not need all of the bulk mbits for the RPC. The RPC
177 * used the mbits of the highest bulk mbits needed, and the server masks
178 * off high bits to get bulk count for this RPC. LU-1431 */
179 mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
180 total_md = desc->bd_req->rq_mbits - mbits + 1;
182 desc->bd_md_count = total_md;
183 desc->bd_failure = 0;
185 md.user_ptr = &desc->bd_cbid;
186 md.eq_handle = ptlrpc_eq_h;
187 md.threshold = 2; /* SENT and ACK/REPLY */
189 for (posted_md = 0; posted_md < total_md; mbits++) {
190 md.options = PTLRPC_MD_OPTIONS;
192 /* NB it's assumed that source and sink buffer frags are
193 * page-aligned. Otherwise we'd have to send client bulk
194 * sizes over and split server buffer accordingly */
195 ptlrpc_fill_bulk_md(&md, desc, posted_md);
196 rc = LNetMDBind(md, LNET_UNLINK, &desc->bd_mds[posted_md]);
198 CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n",
199 exp->exp_obd->obd_name, posted_md, rc);
200 LASSERT(rc == -ENOMEM);
201 if (posted_md == 0) {
202 desc->bd_md_count = 0;
208 /* LU-6441: last md is not sent and desc->bd_md_count == 1 */
209 if (OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3,
211 posted_md == desc->bd_md_max_brw - 1) {
216 /* Network is about to get at the memory */
217 if (ptlrpc_is_bulk_put_source(desc->bd_type))
218 rc = LNetPut(conn->c_self, desc->bd_mds[posted_md],
219 LNET_ACK_REQ, conn->c_peer,
220 desc->bd_portal, mbits, 0, 0);
222 rc = LNetGet(conn->c_self, desc->bd_mds[posted_md],
223 conn->c_peer, desc->bd_portal, mbits, 0);
227 CERROR("%s: failed bulk transfer with %s:%u x%llu: "
228 "rc = %d\n", exp->exp_obd->obd_name,
229 libcfs_id2str(conn->c_peer), desc->bd_portal,
236 /* Can't send, so we unlink the MD bound above. The UNLINK
237 * event this creates will signal completion with failure,
238 * so we return SUCCESS here! */
239 spin_lock(&desc->bd_lock);
240 desc->bd_md_count -= total_md - posted_md;
241 spin_unlock(&desc->bd_lock);
242 LASSERT(desc->bd_md_count >= 0);
244 mdunlink_iterate_helper(desc->bd_mds, posted_md);
248 CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
249 "id %s mbits %#llx-%#llx\n", desc->bd_iov_count,
250 desc->bd_nob, desc->bd_portal, libcfs_id2str(conn->c_peer),
251 mbits - posted_md, mbits - 1);
257 * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
258 * serialises with completion callback)
260 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
262 struct l_wait_info lwi;
265 LASSERT(!in_interrupt()); /* might sleep */
267 if (!ptlrpc_server_bulk_active(desc)) /* completed or */
268 return; /* never started */
270 /* We used to poison the pages with 0xab here because we did not want to
271 * send any meaningful data over the wire for evicted clients (bug 9297)
272 * However, this is no longer safe now that we use the page cache on the
275 /* The unlink ensures the callback happens ASAP and is the last
276 * one. If it fails, it must be because completion just happened,
277 * but we must still l_wait_event() in this case, to give liblustre
278 * a chance to run server_bulk_callback()*/
279 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
282 /* Network access will complete in finite time but the HUGE
283 * timeout lets us CWARN for visibility of sluggish NALs */
284 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
285 cfs_time_seconds(1), NULL, NULL);
286 rc = l_wait_event(desc->bd_waitq,
287 !ptlrpc_server_bulk_active(desc), &lwi);
291 LASSERT(rc == -ETIMEDOUT);
292 CWARN("Unexpectedly long timeout: desc %p\n", desc);
295 #endif /* HAVE_SERVER_SUPPORT */
298 * Register bulk at the sender for later transfer.
299 * Returns 0 on success or error code.
301 int ptlrpc_register_bulk(struct ptlrpc_request *req)
303 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
304 lnet_process_id_t peer;
310 lnet_handle_me_t me_h;
314 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
317 /* NB no locking required until desc is on the network */
318 LASSERT(desc->bd_nob > 0);
319 LASSERT(desc->bd_md_count == 0);
320 LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT);
321 LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
322 LASSERT(desc->bd_req != NULL);
323 LASSERT(ptlrpc_is_bulk_op_passive(desc->bd_type));
325 /* cleanup the state of the bulk for it will be reused */
326 if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY)
327 desc->bd_nob_transferred = 0;
329 LASSERT(desc->bd_nob_transferred == 0);
331 desc->bd_failure = 0;
333 peer = desc->bd_import->imp_connection->c_peer;
335 LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
336 LASSERT(desc->bd_cbid.cbid_arg == desc);
338 total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
339 /* rq_mbits is matchbits of the final bulk */
340 mbits = req->rq_mbits - total_md + 1;
342 LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK),
343 "first mbits = x%llu, last mbits = x%llu\n",
344 mbits, req->rq_mbits);
345 LASSERTF(!(desc->bd_registered &&
346 req->rq_send_state != LUSTRE_IMP_REPLAY) ||
347 mbits != desc->bd_last_mbits,
348 "registered: %d rq_mbits: %llu bd_last_mbits: %llu\n",
349 desc->bd_registered, mbits, desc->bd_last_mbits);
351 desc->bd_registered = 1;
352 desc->bd_last_mbits = mbits;
353 desc->bd_md_count = total_md;
354 md.user_ptr = &desc->bd_cbid;
355 md.eq_handle = ptlrpc_eq_h;
356 md.threshold = 1; /* PUT or GET */
358 for (posted_md = 0; posted_md < total_md; posted_md++, mbits++) {
359 md.options = PTLRPC_MD_OPTIONS |
360 (ptlrpc_is_bulk_op_get(desc->bd_type) ?
361 LNET_MD_OP_GET : LNET_MD_OP_PUT);
362 ptlrpc_fill_bulk_md(&md, desc, posted_md);
364 rc = LNetMEAttach(desc->bd_portal, peer, mbits, 0,
365 LNET_UNLINK, LNET_INS_AFTER, &me_h);
367 CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
368 desc->bd_import->imp_obd->obd_name, mbits,
373 /* About to let the network at it... */
374 rc = LNetMDAttach(me_h, md, LNET_UNLINK,
375 &desc->bd_mds[posted_md]);
377 CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
378 desc->bd_import->imp_obd->obd_name, mbits,
380 rc2 = LNetMEUnlink(me_h);
387 LASSERT(rc == -ENOMEM);
388 spin_lock(&desc->bd_lock);
389 desc->bd_md_count -= total_md - posted_md;
390 spin_unlock(&desc->bd_lock);
391 LASSERT(desc->bd_md_count >= 0);
392 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
393 req->rq_status = -ENOMEM;
397 spin_lock(&desc->bd_lock);
398 /* Holler if peer manages to touch buffers before he knows the mbits */
399 if (desc->bd_md_count != total_md)
400 CWARN("%s: Peer %s touched %d buffers while I registered\n",
401 desc->bd_import->imp_obd->obd_name, libcfs_id2str(peer),
402 total_md - desc->bd_md_count);
403 spin_unlock(&desc->bd_lock);
405 CDEBUG(D_NET, "Setup %u bulk %s buffers: %u pages %u bytes, "
406 "mbits x%#llx-%#llx, portal %u\n", desc->bd_md_count,
407 ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
408 desc->bd_iov_count, desc->bd_nob,
409 desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
415 * Disconnect a bulk desc from the network. Idempotent. Not
416 * thread-safe (i.e. only interlocks with completion callback).
417 * Returns 1 on success or 0 if network unregistration failed for whatever
420 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
422 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
423 struct l_wait_info lwi;
427 LASSERT(!in_interrupt()); /* might sleep */
429 /* Let's setup deadline for reply unlink. */
430 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
431 async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
432 req->rq_bulk_deadline = cfs_time_current_sec() + LONG_UNLINK;
434 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
435 RETURN(1); /* never registered */
437 LASSERT(desc->bd_req == req); /* bd_req NULL until registered */
439 /* the unlink ensures the callback happens ASAP and is the last
440 * one. If it fails, it must be because completion just happened,
441 * but we must still l_wait_event() in this case to give liblustre
442 * a chance to run client_bulk_callback() */
443 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
445 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
446 RETURN(1); /* never registered */
448 /* Move to "Unregistering" phase as bulk was not unlinked yet. */
449 ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
451 /* Do not wait for unlink to finish. */
456 /* The wq argument is ignored by user-space wait_event macros */
457 wait_queue_head_t *wq = (req->rq_set != NULL) ?
458 &req->rq_set->set_waitq :
459 &req->rq_reply_waitq;
460 /* Network access will complete in finite time but the HUGE
461 * timeout lets us CWARN for visibility of sluggish NALs */
462 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
463 cfs_time_seconds(1), NULL, NULL);
464 rc = l_wait_event(*wq, !ptlrpc_client_bulk_active(req), &lwi);
466 ptlrpc_rqphase_move(req, req->rq_next_phase);
470 LASSERT(rc == -ETIMEDOUT);
471 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
477 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
479 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
480 struct ptlrpc_service *svc = svcpt->scp_service;
481 int service_time = max_t(int, cfs_time_current_sec() -
482 req->rq_arrival_time.tv_sec, 1);
484 if (!(flags & PTLRPC_REPLY_EARLY) &&
485 (req->rq_type != PTL_RPC_MSG_ERR) &&
486 (req->rq_reqmsg != NULL) &&
487 !(lustre_msg_get_flags(req->rq_reqmsg) &
488 (MSG_RESENT | MSG_REPLAY |
489 MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
490 /* early replies, errors and recovery requests don't count
491 * toward our service time estimate */
492 int oldse = at_measured(&svcpt->scp_at_estimate, service_time);
495 DEBUG_REQ(D_ADAPTTO, req,
496 "svc %s changed estimate from %d to %d",
497 svc->srv_name, oldse,
498 at_get(&svcpt->scp_at_estimate));
501 /* Report actual service time for client latency calc */
502 lustre_msg_set_service_time(req->rq_repmsg, service_time);
503 /* Report service time estimate for future client reqs, but report 0
504 * (to be ignored by client) if it's an error reply during recovery.
506 if (req->rq_type == PTL_RPC_MSG_ERR &&
507 (req->rq_export == NULL ||
508 req->rq_export->exp_obd->obd_recovering)) {
509 lustre_msg_set_timeout(req->rq_repmsg, 0);
513 if (req->rq_export && req->rq_reqmsg != NULL &&
514 lustre_msg_get_flags(req->rq_reqmsg) &
515 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))
516 timeout = cfs_time_current_sec() -
517 req->rq_arrival_time.tv_sec +
519 req->rq_export->exp_obd->
520 obd_recovery_timeout / 4);
522 timeout = at_get(&svcpt->scp_at_estimate);
523 lustre_msg_set_timeout(req->rq_repmsg, timeout);
526 if (req->rq_reqmsg &&
527 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
528 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
529 "req_flags=%#x magic=%x/%x len=%d\n",
530 flags, lustre_msg_get_flags(req->rq_reqmsg),
531 lustre_msg_get_magic(req->rq_reqmsg),
532 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
537 * Send request reply from request \a req reply buffer.
538 * \a flags defines reply types
539 * Returns 0 on success or error code
541 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
543 struct ptlrpc_reply_state *rs = req->rq_reply_state;
544 struct ptlrpc_connection *conn;
547 /* We must already have a reply buffer (only ptlrpc_error() may be
548 * called without one). The reply generated by sptlrpc layer (e.g.
549 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
550 * have a request buffer which is either the actual (swabbed) incoming
551 * request, or a saved copy if this is a req saved in
552 * target_queue_final_reply().
554 LASSERT (req->rq_no_reply == 0);
555 LASSERT (req->rq_reqbuf != NULL);
556 LASSERT (rs != NULL);
557 LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
558 LASSERT (req->rq_repmsg != NULL);
559 LASSERT (req->rq_repmsg == rs->rs_msg);
560 LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
561 LASSERT (rs->rs_cb_id.cbid_arg == rs);
563 /* There may be no rq_export during failover */
565 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
566 req->rq_export->exp_obd->obd_fail)) {
567 /* Failed obd's only send ENODEV */
568 req->rq_type = PTL_RPC_MSG_ERR;
569 req->rq_status = -ENODEV;
570 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
571 req->rq_export->exp_obd->obd_minor);
574 /* In order to keep interoprability with the client (< 2.3) which
575 * doesn't have pb_jobid in ptlrpc_body, We have to shrink the
576 * ptlrpc_body in reply buffer to ptlrpc_body_v2, otherwise, the
577 * reply buffer on client will be overflow.
579 * XXX Remove this whenver we drop the interoprability with such client.
581 req->rq_replen = lustre_shrink_msg(req->rq_repmsg, 0,
582 sizeof(struct ptlrpc_body_v2), 1);
584 if (req->rq_type != PTL_RPC_MSG_ERR)
585 req->rq_type = PTL_RPC_MSG_REPLY;
587 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
588 lustre_msg_set_status(req->rq_repmsg,
589 ptlrpc_status_hton(req->rq_status));
590 lustre_msg_set_opc(req->rq_repmsg,
591 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
593 target_pack_pool_reply(req);
595 ptlrpc_at_set_reply(req, flags);
597 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
598 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
600 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
602 if (unlikely(conn == NULL)) {
603 CERROR("not replying on NULL connection\n"); /* bug 9635 */
606 ptlrpc_rs_addref(rs); /* +1 ref for the network */
608 rc = sptlrpc_svc_wrap_reply(req);
612 req->rq_sent = cfs_time_current_sec();
614 rc = ptl_send_buf (&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
615 (rs->rs_difficult && !rs->rs_no_ack) ?
616 LNET_ACK_REQ : LNET_NOACK_REQ,
618 ptlrpc_req2svc(req)->srv_rep_portal,
619 req->rq_xid, req->rq_reply_off);
621 if (unlikely(rc != 0))
622 ptlrpc_req_drop_rs(req);
623 ptlrpc_connection_put(conn);
627 int ptlrpc_reply (struct ptlrpc_request *req)
629 if (req->rq_no_reply)
632 return (ptlrpc_send_reply(req, 0));
636 * For request \a req send an error reply back. Create empty
637 * reply buffers if necessary.
639 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
644 if (req->rq_no_reply)
647 if (!req->rq_repmsg) {
648 rc = lustre_pack_reply(req, 1, NULL, NULL);
653 if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
654 req->rq_status != -EPERM && req->rq_status != -ENOENT &&
655 req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
656 req->rq_type = PTL_RPC_MSG_ERR;
658 rc = ptlrpc_send_reply(req, may_be_difficult);
662 int ptlrpc_error(struct ptlrpc_request *req)
664 return ptlrpc_send_error(req, 0);
668 * Send request \a request.
669 * if \a noreply is set, don't expect any reply back and don't set up
671 * Returns 0 on success or error code.
673 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
678 struct ptlrpc_connection *connection;
679 lnet_handle_me_t reply_me_h;
681 struct obd_import *imp = request->rq_import;
682 struct obd_device *obd = imp->imp_obd;
685 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
688 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
689 LASSERT(request->rq_wait_ctx == 0);
691 /* If this is a re-transmit, we're required to have disengaged
692 * cleanly from the previous attempt */
693 LASSERT(!request->rq_receiving_reply);
694 LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
695 (imp->imp_state == LUSTRE_IMP_FULL)));
697 if (unlikely(obd != NULL && obd->obd_fail)) {
698 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
700 /* this prevents us from waiting in ptlrpc_queue_wait */
701 spin_lock(&request->rq_lock);
703 spin_unlock(&request->rq_lock);
704 request->rq_status = -ENODEV;
708 connection = imp->imp_connection;
710 lustre_msg_set_handle(request->rq_reqmsg,
711 &imp->imp_remote_handle);
712 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
713 lustre_msg_set_conn_cnt(request->rq_reqmsg,
715 lustre_msghdr_set_flags(request->rq_reqmsg,
716 imp->imp_msghdr_flags);
718 /* If it's the first time to resend the request for EINPROGRESS,
719 * we need to allocate a new XID (see after_reply()), it's different
720 * from the resend for reply timeout. */
721 if (request->rq_nr_resend != 0 &&
722 list_empty(&request->rq_unreplied_list)) {
724 /* resend for EINPROGRESS, allocate new xid to avoid reply
726 spin_lock(&imp->imp_lock);
727 ptlrpc_assign_next_xid_nolock(request);
728 min_xid = ptlrpc_known_replied_xid(imp);
729 spin_unlock(&imp->imp_lock);
731 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
732 DEBUG_REQ(D_RPCTRACE, request, "Allocating new xid for "
733 "resend on EINPROGRESS");
736 if (request->rq_bulk != NULL) {
737 ptlrpc_set_bulk_mbits(request);
738 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
741 if (list_empty(&request->rq_unreplied_list) ||
742 request->rq_xid <= imp->imp_known_replied_xid) {
743 DEBUG_REQ(D_ERROR, request, "xid: %llu, replied: %llu, "
744 "list_empty:%d\n", request->rq_xid,
745 imp->imp_known_replied_xid,
746 list_empty(&request->rq_unreplied_list));
750 /** For enabled AT all request should have AT_SUPPORT in the
751 * FULL import state when OBD_CONNECT_AT is set */
752 LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
753 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
754 !(imp->imp_connect_data.ocd_connect_flags &
757 if (request->rq_resend) {
758 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
759 if (request->rq_resend_cb != NULL)
760 request->rq_resend_cb(request, &request->rq_async_args);
762 if (request->rq_memalloc)
763 mpflag = cfs_memory_pressure_get_and_set();
765 rc = sptlrpc_cli_wrap_request(request);
767 /* set rq_sent so that this request is treated
768 * as a delayed send in the upper layers */
769 request->rq_sent = cfs_time_current_sec();
773 /* bulk register should be done after wrap_request() */
774 if (request->rq_bulk != NULL) {
775 rc = ptlrpc_register_bulk (request);
781 LASSERT (request->rq_replen != 0);
782 if (request->rq_repbuf == NULL) {
783 LASSERT(request->rq_repdata == NULL);
784 LASSERT(request->rq_repmsg == NULL);
785 rc = sptlrpc_cli_alloc_repbuf(request,
788 /* this prevents us from looping in
789 * ptlrpc_queue_wait */
790 spin_lock(&request->rq_lock);
792 spin_unlock(&request->rq_lock);
793 request->rq_status = rc;
794 GOTO(cleanup_bulk, rc);
797 request->rq_repdata = NULL;
798 request->rq_repmsg = NULL;
801 rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/
802 connection->c_peer, request->rq_xid, 0,
803 LNET_UNLINK, LNET_INS_AFTER, &reply_me_h);
805 CERROR("LNetMEAttach failed: %d\n", rc);
806 LASSERT (rc == -ENOMEM);
807 GOTO(cleanup_bulk, rc = -ENOMEM);
811 spin_lock(&request->rq_lock);
812 /* We are responsible for unlinking the reply buffer */
813 request->rq_reply_unlinked = noreply;
814 request->rq_receiving_reply = !noreply;
815 /* Clear any flags that may be present from previous sends. */
816 request->rq_req_unlinked = 0;
817 request->rq_replied = 0;
819 request->rq_timedout = 0;
820 request->rq_net_err = 0;
821 request->rq_resend = 0;
822 request->rq_restart = 0;
823 request->rq_reply_truncated = 0;
824 spin_unlock(&request->rq_lock);
827 reply_md.start = request->rq_repbuf;
828 reply_md.length = request->rq_repbuf_len;
829 /* Allow multiple early replies */
830 reply_md.threshold = LNET_MD_THRESH_INF;
831 /* Manage remote for early replies */
832 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
833 LNET_MD_MANAGE_REMOTE |
834 LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
835 reply_md.user_ptr = &request->rq_reply_cbid;
836 reply_md.eq_handle = ptlrpc_eq_h;
838 /* We must see the unlink callback to set rq_reply_unlinked,
839 * so we can't auto-unlink */
840 rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN,
841 &request->rq_reply_md_h);
843 CERROR("LNetMDAttach failed: %d\n", rc);
844 LASSERT (rc == -ENOMEM);
845 spin_lock(&request->rq_lock);
846 /* ...but the MD attach didn't succeed... */
847 request->rq_receiving_reply = 0;
848 spin_unlock(&request->rq_lock);
849 GOTO(cleanup_me, rc = -ENOMEM);
852 CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid %llu"
854 request->rq_repbuf_len, request->rq_xid,
855 request->rq_reply_portal);
858 /* add references on request for request_out_callback */
859 ptlrpc_request_addref(request);
860 if (obd != NULL && obd->obd_svc_stats != NULL)
861 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
862 atomic_read(&imp->imp_inflight));
864 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
866 do_gettimeofday(&request->rq_sent_tv);
867 request->rq_sent = cfs_time_current_sec();
868 /* We give the server rq_timeout secs to process the req, and
869 add the network latency for our local timeout. */
870 request->rq_deadline = request->rq_sent + request->rq_timeout +
871 ptlrpc_at_get_net_latency(request);
873 ptlrpc_pinger_sending_on_import(imp);
875 DEBUG_REQ(D_INFO, request, "send flg=%x",
876 lustre_msg_get_flags(request->rq_reqmsg));
877 rc = ptl_send_buf(&request->rq_req_md_h,
878 request->rq_reqbuf, request->rq_reqdata_len,
879 LNET_NOACK_REQ, &request->rq_req_cbid,
881 request->rq_request_portal,
886 request->rq_req_unlinked = 1;
887 ptlrpc_req_finished(request);
892 /* MEUnlink is safe; the PUT didn't even get off the ground, and
893 * nobody apart from the PUT's target has the right nid+XID to
894 * access the reply buffer. */
895 rc2 = LNetMEUnlink(reply_me_h);
897 /* UNLINKED callback called synchronously */
898 LASSERT(!request->rq_receiving_reply);
901 /* We do sync unlink here as there was no real transfer here so
902 * the chance to have long unlink to sluggish net is smaller here. */
903 ptlrpc_unregister_bulk(request, 0);
905 if (request->rq_memalloc)
906 cfs_memory_pressure_restore(mpflag);
909 EXPORT_SYMBOL(ptl_send_rpc);
912 * Register request buffer descriptor for request receiving.
914 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
916 struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
917 static lnet_process_id_t match_id = {LNET_NID_ANY, LNET_PID_ANY};
920 lnet_handle_me_t me_h;
922 CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
923 service->srv_req_portal);
925 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
928 /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
929 * which means buffer can only be attached on local CPT, and LND
930 * threads can find it by grabbing a local lock */
931 rc = LNetMEAttach(service->srv_req_portal,
932 match_id, 0, ~0, LNET_UNLINK,
933 rqbd->rqbd_svcpt->scp_cpt >= 0 ?
934 LNET_INS_LOCAL : LNET_INS_AFTER, &me_h);
936 CERROR("LNetMEAttach failed: %d\n", rc);
940 LASSERT(rqbd->rqbd_refcount == 0);
941 rqbd->rqbd_refcount = 1;
943 md.start = rqbd->rqbd_buffer;
944 md.length = service->srv_buf_size;
945 md.max_size = service->srv_max_req_size;
946 md.threshold = LNET_MD_THRESH_INF;
947 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
948 md.user_ptr = &rqbd->rqbd_cbid;
949 md.eq_handle = ptlrpc_eq_h;
951 rc = LNetMDAttach(me_h, md, LNET_UNLINK, &rqbd->rqbd_md_h);
955 CERROR("LNetMDAttach failed: %d; \n", rc);
956 LASSERT (rc == -ENOMEM);
957 rc = LNetMEUnlink (me_h);
959 rqbd->rqbd_refcount = 0;