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, 2014, 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 "LPD64", 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, "LPD64") 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"LPU64": "
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 "LPX64"-"LPX64"\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"LPU64", last mbits = x"LPU64"\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: "LPU64" bd_last_mbits: "LPU64"\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"LPU64"/%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"LPU64"/%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"LPX64"-"LPX64", 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)
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_UNREGISTERING);
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 || req->rq_export->exp_obd->obd_recovering))
508 lustre_msg_set_timeout(req->rq_repmsg, 0);
510 lustre_msg_set_timeout(req->rq_repmsg,
511 at_get(&svcpt->scp_at_estimate));
513 if (req->rq_reqmsg &&
514 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
515 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
516 "req_flags=%#x magic=%x/%x len=%d\n",
517 flags, lustre_msg_get_flags(req->rq_reqmsg),
518 lustre_msg_get_magic(req->rq_reqmsg),
519 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
524 * Send request reply from request \a req reply buffer.
525 * \a flags defines reply types
526 * Returns 0 on success or error code
528 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
530 struct ptlrpc_reply_state *rs = req->rq_reply_state;
531 struct ptlrpc_connection *conn;
534 /* We must already have a reply buffer (only ptlrpc_error() may be
535 * called without one). The reply generated by sptlrpc layer (e.g.
536 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
537 * have a request buffer which is either the actual (swabbed) incoming
538 * request, or a saved copy if this is a req saved in
539 * target_queue_final_reply().
541 LASSERT (req->rq_no_reply == 0);
542 LASSERT (req->rq_reqbuf != NULL);
543 LASSERT (rs != NULL);
544 LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
545 LASSERT (req->rq_repmsg != NULL);
546 LASSERT (req->rq_repmsg == rs->rs_msg);
547 LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
548 LASSERT (rs->rs_cb_id.cbid_arg == rs);
550 /* There may be no rq_export during failover */
552 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
553 req->rq_export->exp_obd->obd_fail)) {
554 /* Failed obd's only send ENODEV */
555 req->rq_type = PTL_RPC_MSG_ERR;
556 req->rq_status = -ENODEV;
557 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
558 req->rq_export->exp_obd->obd_minor);
561 /* In order to keep interoprability with the client (< 2.3) which
562 * doesn't have pb_jobid in ptlrpc_body, We have to shrink the
563 * ptlrpc_body in reply buffer to ptlrpc_body_v2, otherwise, the
564 * reply buffer on client will be overflow.
566 * XXX Remove this whenver we drop the interoprability with such client.
568 req->rq_replen = lustre_shrink_msg(req->rq_repmsg, 0,
569 sizeof(struct ptlrpc_body_v2), 1);
571 if (req->rq_type != PTL_RPC_MSG_ERR)
572 req->rq_type = PTL_RPC_MSG_REPLY;
574 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
575 lustre_msg_set_status(req->rq_repmsg,
576 ptlrpc_status_hton(req->rq_status));
577 lustre_msg_set_opc(req->rq_repmsg,
578 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
580 target_pack_pool_reply(req);
582 ptlrpc_at_set_reply(req, flags);
584 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
585 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
587 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
589 if (unlikely(conn == NULL)) {
590 CERROR("not replying on NULL connection\n"); /* bug 9635 */
593 ptlrpc_rs_addref(rs); /* +1 ref for the network */
595 rc = sptlrpc_svc_wrap_reply(req);
599 req->rq_sent = cfs_time_current_sec();
601 rc = ptl_send_buf (&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
602 (rs->rs_difficult && !rs->rs_no_ack) ?
603 LNET_ACK_REQ : LNET_NOACK_REQ,
605 ptlrpc_req2svc(req)->srv_rep_portal,
606 req->rq_xid, req->rq_reply_off);
608 if (unlikely(rc != 0))
609 ptlrpc_req_drop_rs(req);
610 ptlrpc_connection_put(conn);
614 int ptlrpc_reply (struct ptlrpc_request *req)
616 if (req->rq_no_reply)
619 return (ptlrpc_send_reply(req, 0));
623 * For request \a req send an error reply back. Create empty
624 * reply buffers if necessary.
626 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
631 if (req->rq_no_reply)
634 if (!req->rq_repmsg) {
635 rc = lustre_pack_reply(req, 1, NULL, NULL);
640 if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
641 req->rq_status != -EPERM && req->rq_status != -ENOENT &&
642 req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
643 req->rq_type = PTL_RPC_MSG_ERR;
645 rc = ptlrpc_send_reply(req, may_be_difficult);
649 int ptlrpc_error(struct ptlrpc_request *req)
651 return ptlrpc_send_error(req, 0);
655 * Send request \a request.
656 * if \a noreply is set, don't expect any reply back and don't set up
658 * Returns 0 on success or error code.
660 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
665 struct ptlrpc_connection *connection;
666 lnet_handle_me_t reply_me_h;
668 struct obd_import *imp = request->rq_import;
669 struct obd_device *obd = imp->imp_obd;
672 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
675 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
676 LASSERT(request->rq_wait_ctx == 0);
678 /* If this is a re-transmit, we're required to have disengaged
679 * cleanly from the previous attempt */
680 LASSERT(!request->rq_receiving_reply);
681 LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
682 (imp->imp_state == LUSTRE_IMP_FULL)));
684 if (unlikely(obd != NULL && obd->obd_fail)) {
685 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
687 /* this prevents us from waiting in ptlrpc_queue_wait */
688 spin_lock(&request->rq_lock);
690 spin_unlock(&request->rq_lock);
691 request->rq_status = -ENODEV;
695 connection = imp->imp_connection;
697 lustre_msg_set_handle(request->rq_reqmsg,
698 &imp->imp_remote_handle);
699 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
700 lustre_msg_set_conn_cnt(request->rq_reqmsg,
702 lustre_msghdr_set_flags(request->rq_reqmsg,
703 imp->imp_msghdr_flags);
705 if (request->rq_nr_resend != 0) {
706 /* resend for EINPROGRESS, allocate new xid to avoid reply
708 request->rq_xid = ptlrpc_next_xid();
709 DEBUG_REQ(D_RPCTRACE, request, "Allocating new xid for "
710 "resend on EINPROGRESS");
713 if (request->rq_bulk != NULL) {
714 ptlrpc_set_bulk_mbits(request);
715 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
718 /** For enabled AT all request should have AT_SUPPORT in the
719 * FULL import state when OBD_CONNECT_AT is set */
720 LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
721 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
722 !(imp->imp_connect_data.ocd_connect_flags &
725 if (request->rq_resend) {
726 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
727 if (request->rq_resend_cb != NULL)
728 request->rq_resend_cb(request, &request->rq_async_args);
730 if (request->rq_memalloc)
731 mpflag = cfs_memory_pressure_get_and_set();
733 rc = sptlrpc_cli_wrap_request(request);
735 /* set rq_sent so that this request is treated
736 * as a delayed send in the upper layers */
737 request->rq_sent = cfs_time_current_sec();
741 /* bulk register should be done after wrap_request() */
742 if (request->rq_bulk != NULL) {
743 rc = ptlrpc_register_bulk (request);
749 LASSERT (request->rq_replen != 0);
750 if (request->rq_repbuf == NULL) {
751 LASSERT(request->rq_repdata == NULL);
752 LASSERT(request->rq_repmsg == NULL);
753 rc = sptlrpc_cli_alloc_repbuf(request,
756 /* this prevents us from looping in
757 * ptlrpc_queue_wait */
758 spin_lock(&request->rq_lock);
760 spin_unlock(&request->rq_lock);
761 request->rq_status = rc;
762 GOTO(cleanup_bulk, rc);
765 request->rq_repdata = NULL;
766 request->rq_repmsg = NULL;
769 rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/
770 connection->c_peer, request->rq_xid, 0,
771 LNET_UNLINK, LNET_INS_AFTER, &reply_me_h);
773 CERROR("LNetMEAttach failed: %d\n", rc);
774 LASSERT (rc == -ENOMEM);
775 GOTO(cleanup_bulk, rc = -ENOMEM);
779 spin_lock(&request->rq_lock);
780 /* We are responsible for unlinking the reply buffer */
781 request->rq_reply_unlinked = noreply;
782 request->rq_receiving_reply = !noreply;
783 /* Clear any flags that may be present from previous sends. */
784 request->rq_req_unlinked = 0;
785 request->rq_replied = 0;
787 request->rq_timedout = 0;
788 request->rq_net_err = 0;
789 request->rq_resend = 0;
790 request->rq_restart = 0;
791 request->rq_reply_truncated = 0;
792 spin_unlock(&request->rq_lock);
795 reply_md.start = request->rq_repbuf;
796 reply_md.length = request->rq_repbuf_len;
797 /* Allow multiple early replies */
798 reply_md.threshold = LNET_MD_THRESH_INF;
799 /* Manage remote for early replies */
800 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
801 LNET_MD_MANAGE_REMOTE |
802 LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
803 reply_md.user_ptr = &request->rq_reply_cbid;
804 reply_md.eq_handle = ptlrpc_eq_h;
806 /* We must see the unlink callback to set rq_reply_unlinked,
807 * so we can't auto-unlink */
808 rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN,
809 &request->rq_reply_md_h);
811 CERROR("LNetMDAttach failed: %d\n", rc);
812 LASSERT (rc == -ENOMEM);
813 spin_lock(&request->rq_lock);
814 /* ...but the MD attach didn't succeed... */
815 request->rq_receiving_reply = 0;
816 spin_unlock(&request->rq_lock);
817 GOTO(cleanup_me, rc = -ENOMEM);
820 CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid "LPU64
822 request->rq_repbuf_len, request->rq_xid,
823 request->rq_reply_portal);
826 /* add references on request for request_out_callback */
827 ptlrpc_request_addref(request);
828 if (obd != NULL && obd->obd_svc_stats != NULL)
829 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
830 atomic_read(&imp->imp_inflight));
832 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
834 do_gettimeofday(&request->rq_sent_tv);
835 request->rq_sent = cfs_time_current_sec();
836 /* We give the server rq_timeout secs to process the req, and
837 add the network latency for our local timeout. */
838 request->rq_deadline = request->rq_sent + request->rq_timeout +
839 ptlrpc_at_get_net_latency(request);
841 ptlrpc_pinger_sending_on_import(imp);
843 DEBUG_REQ(D_INFO, request, "send flg=%x",
844 lustre_msg_get_flags(request->rq_reqmsg));
845 rc = ptl_send_buf(&request->rq_req_md_h,
846 request->rq_reqbuf, request->rq_reqdata_len,
847 LNET_NOACK_REQ, &request->rq_req_cbid,
849 request->rq_request_portal,
854 request->rq_req_unlinked = 1;
855 ptlrpc_req_finished(request);
860 /* MEUnlink is safe; the PUT didn't even get off the ground, and
861 * nobody apart from the PUT's target has the right nid+XID to
862 * access the reply buffer. */
863 rc2 = LNetMEUnlink(reply_me_h);
865 /* UNLINKED callback called synchronously */
866 LASSERT(!request->rq_receiving_reply);
869 /* We do sync unlink here as there was no real transfer here so
870 * the chance to have long unlink to sluggish net is smaller here. */
871 ptlrpc_unregister_bulk(request, 0);
873 if (request->rq_memalloc)
874 cfs_memory_pressure_restore(mpflag);
877 EXPORT_SYMBOL(ptl_send_rpc);
880 * Register request buffer descriptor for request receiving.
882 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
884 struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
885 static lnet_process_id_t match_id = {LNET_NID_ANY, LNET_PID_ANY};
888 lnet_handle_me_t me_h;
890 CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
891 service->srv_req_portal);
893 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
896 /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
897 * which means buffer can only be attached on local CPT, and LND
898 * threads can find it by grabbing a local lock */
899 rc = LNetMEAttach(service->srv_req_portal,
900 match_id, 0, ~0, LNET_UNLINK,
901 rqbd->rqbd_svcpt->scp_cpt >= 0 ?
902 LNET_INS_LOCAL : LNET_INS_AFTER, &me_h);
904 CERROR("LNetMEAttach failed: %d\n", rc);
908 LASSERT(rqbd->rqbd_refcount == 0);
909 rqbd->rqbd_refcount = 1;
911 md.start = rqbd->rqbd_buffer;
912 md.length = service->srv_buf_size;
913 md.max_size = service->srv_max_req_size;
914 md.threshold = LNET_MD_THRESH_INF;
915 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
916 md.user_ptr = &rqbd->rqbd_cbid;
917 md.eq_handle = ptlrpc_eq_h;
919 rc = LNetMDAttach(me_h, md, LNET_UNLINK, &rqbd->rqbd_md_h);
923 CERROR("LNetMDAttach failed: %d; \n", rc);
924 LASSERT (rc == -ENOMEM);
925 rc = LNetMEUnlink (me_h);
927 rqbd->rqbd_refcount = 0;