1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
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.
9 *
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).
15 *
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
19 *
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
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37 #define DEBUG_SUBSYSTEM S_RPC
38 #include "../include/obd_support.h"
39 #include "../include/lustre_net.h"
40 #include "../include/lustre_lib.h"
41 #include "../include/obd.h"
42 #include "../include/obd_class.h"
43 #include "ptlrpc_internal.h"
44
45 /**
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.
49 */
ptl_send_buf(lnet_handle_md_t * mdh,void * base,int len,lnet_ack_req_t ack,struct ptlrpc_cb_id * cbid,struct ptlrpc_connection * conn,int portal,__u64 xid,unsigned int offset)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,
53 unsigned int offset)
54 {
55 int rc;
56 lnet_md_t md;
57
58 LASSERT(portal != 0);
59 LASSERT(conn != NULL);
60 CDEBUG(D_INFO, "conn=%p id %s\n", conn, libcfs_id2str(conn->c_peer));
61 md.start = base;
62 md.length = len;
63 md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
64 md.options = PTLRPC_MD_OPTIONS;
65 md.user_ptr = cbid;
66 md.eq_handle = ptlrpc_eq_h;
67
68 if (unlikely(ack == LNET_ACK_REQ &&
69 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK,
70 OBD_FAIL_ONCE))) {
71 /* don't ask for the ack to simulate failing client */
72 ack = LNET_NOACK_REQ;
73 }
74
75 rc = LNetMDBind(md, LNET_UNLINK, mdh);
76 if (unlikely(rc != 0)) {
77 CERROR("LNetMDBind failed: %d\n", rc);
78 LASSERT(rc == -ENOMEM);
79 return -ENOMEM;
80 }
81
82 CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
83 len, portal, xid, offset);
84
85 rc = LNetPut(conn->c_self, *mdh, ack,
86 conn->c_peer, portal, xid, offset, 0);
87 if (unlikely(rc != 0)) {
88 int rc2;
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);
96 }
97
98 return 0;
99 }
100
mdunlink_iterate_helper(lnet_handle_md_t * bd_mds,int count)101 static void mdunlink_iterate_helper(lnet_handle_md_t *bd_mds, int count)
102 {
103 int i;
104
105 for (i = 0; i < count; i++)
106 LNetMDUnlink(bd_mds[i]);
107 }
108
109 /**
110 * Register bulk at the sender for later transfer.
111 * Returns 0 on success or error code.
112 */
ptlrpc_register_bulk(struct ptlrpc_request * req)113 static int ptlrpc_register_bulk(struct ptlrpc_request *req)
114 {
115 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
116 lnet_process_id_t peer;
117 int rc = 0;
118 int rc2;
119 int posted_md;
120 int total_md;
121 __u64 xid;
122 lnet_handle_me_t me_h;
123 lnet_md_t md;
124
125 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
126 return 0;
127
128 /* NB no locking required until desc is on the network */
129 LASSERT(desc->bd_nob > 0);
130 LASSERT(desc->bd_md_count == 0);
131 LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT);
132 LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
133 LASSERT(desc->bd_req != NULL);
134 LASSERT(desc->bd_type == BULK_PUT_SINK ||
135 desc->bd_type == BULK_GET_SOURCE);
136
137 /* cleanup the state of the bulk for it will be reused */
138 if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY)
139 desc->bd_nob_transferred = 0;
140 else
141 LASSERT(desc->bd_nob_transferred == 0);
142
143 desc->bd_failure = 0;
144
145 peer = desc->bd_import->imp_connection->c_peer;
146
147 LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
148 LASSERT(desc->bd_cbid.cbid_arg == desc);
149
150 /* An XID is only used for a single request from the client.
151 * For retried bulk transfers, a new XID will be allocated in
152 * in ptlrpc_check_set() if it needs to be resent, so it is not
153 * using the same RDMA match bits after an error.
154 *
155 * For multi-bulk RPCs, rq_xid is the last XID needed for bulks. The
156 * first bulk XID is power-of-two aligned before rq_xid. LU-1431 */
157 xid = req->rq_xid & ~((__u64)desc->bd_md_max_brw - 1);
158 LASSERTF(!(desc->bd_registered &&
159 req->rq_send_state != LUSTRE_IMP_REPLAY) ||
160 xid != desc->bd_last_xid,
161 "registered: %d rq_xid: %llu bd_last_xid: %llu\n",
162 desc->bd_registered, xid, desc->bd_last_xid);
163
164 total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
165 desc->bd_registered = 1;
166 desc->bd_last_xid = xid;
167 desc->bd_md_count = total_md;
168 md.user_ptr = &desc->bd_cbid;
169 md.eq_handle = ptlrpc_eq_h;
170 md.threshold = 1; /* PUT or GET */
171
172 for (posted_md = 0; posted_md < total_md; posted_md++, xid++) {
173 md.options = PTLRPC_MD_OPTIONS |
174 ((desc->bd_type == BULK_GET_SOURCE) ?
175 LNET_MD_OP_GET : LNET_MD_OP_PUT);
176 ptlrpc_fill_bulk_md(&md, desc, posted_md);
177
178 rc = LNetMEAttach(desc->bd_portal, peer, xid, 0,
179 LNET_UNLINK, LNET_INS_AFTER, &me_h);
180 if (rc != 0) {
181 CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
182 desc->bd_import->imp_obd->obd_name, xid,
183 posted_md, rc);
184 break;
185 }
186
187 /* About to let the network at it... */
188 rc = LNetMDAttach(me_h, md, LNET_UNLINK,
189 &desc->bd_mds[posted_md]);
190 if (rc != 0) {
191 CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
192 desc->bd_import->imp_obd->obd_name, xid,
193 posted_md, rc);
194 rc2 = LNetMEUnlink(me_h);
195 LASSERT(rc2 == 0);
196 break;
197 }
198 }
199
200 if (rc != 0) {
201 LASSERT(rc == -ENOMEM);
202 spin_lock(&desc->bd_lock);
203 desc->bd_md_count -= total_md - posted_md;
204 spin_unlock(&desc->bd_lock);
205 LASSERT(desc->bd_md_count >= 0);
206 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
207 req->rq_status = -ENOMEM;
208 return -ENOMEM;
209 }
210
211 /* Set rq_xid to matchbits of the final bulk so that server can
212 * infer the number of bulks that were prepared */
213 req->rq_xid = --xid;
214 LASSERTF(desc->bd_last_xid == (req->rq_xid & PTLRPC_BULK_OPS_MASK),
215 "bd_last_xid = x%llu, rq_xid = x%llu\n",
216 desc->bd_last_xid, req->rq_xid);
217
218 spin_lock(&desc->bd_lock);
219 /* Holler if peer manages to touch buffers before he knows the xid */
220 if (desc->bd_md_count != total_md)
221 CWARN("%s: Peer %s touched %d buffers while I registered\n",
222 desc->bd_import->imp_obd->obd_name, libcfs_id2str(peer),
223 total_md - desc->bd_md_count);
224 spin_unlock(&desc->bd_lock);
225
226 CDEBUG(D_NET, "Setup %u bulk %s buffers: %u pages %u bytes, xid x%#llx-%#llx, portal %u\n",
227 desc->bd_md_count,
228 desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
229 desc->bd_iov_count, desc->bd_nob,
230 desc->bd_last_xid, req->rq_xid, desc->bd_portal);
231
232 return 0;
233 }
234
235 /**
236 * Disconnect a bulk desc from the network. Idempotent. Not
237 * thread-safe (i.e. only interlocks with completion callback).
238 * Returns 1 on success or 0 if network unregistration failed for whatever
239 * reason.
240 */
ptlrpc_unregister_bulk(struct ptlrpc_request * req,int async)241 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
242 {
243 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
244 wait_queue_head_t *wq;
245 struct l_wait_info lwi;
246 int rc;
247
248 LASSERT(!in_interrupt()); /* might sleep */
249
250 /* Let's setup deadline for reply unlink. */
251 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
252 async && req->rq_bulk_deadline == 0)
253 req->rq_bulk_deadline = ktime_get_real_seconds() + LONG_UNLINK;
254
255 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
256 return 1; /* never registered */
257
258 LASSERT(desc->bd_req == req); /* bd_req NULL until registered */
259
260 /* the unlink ensures the callback happens ASAP and is the last
261 * one. If it fails, it must be because completion just happened,
262 * but we must still l_wait_event() in this case to give liblustre
263 * a chance to run client_bulk_callback() */
264 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
265
266 if (ptlrpc_client_bulk_active(req) == 0) /* completed or */
267 return 1; /* never registered */
268
269 /* Move to "Unregistering" phase as bulk was not unlinked yet. */
270 ptlrpc_rqphase_move(req, RQ_PHASE_UNREGISTERING);
271
272 /* Do not wait for unlink to finish. */
273 if (async)
274 return 0;
275
276 if (req->rq_set != NULL)
277 wq = &req->rq_set->set_waitq;
278 else
279 wq = &req->rq_reply_waitq;
280
281 for (;;) {
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(*wq, !ptlrpc_client_bulk_active(req), &lwi);
287 if (rc == 0) {
288 ptlrpc_rqphase_move(req, req->rq_next_phase);
289 return 1;
290 }
291
292 LASSERT(rc == -ETIMEDOUT);
293 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
294 desc);
295 }
296 return 0;
297 }
298 EXPORT_SYMBOL(ptlrpc_unregister_bulk);
299
ptlrpc_at_set_reply(struct ptlrpc_request * req,int flags)300 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
301 {
302 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
303 struct ptlrpc_service *svc = svcpt->scp_service;
304 int service_time = max_t(int, ktime_get_real_seconds() -
305 req->rq_arrival_time.tv_sec, 1);
306
307 if (!(flags & PTLRPC_REPLY_EARLY) &&
308 (req->rq_type != PTL_RPC_MSG_ERR) &&
309 (req->rq_reqmsg != NULL) &&
310 !(lustre_msg_get_flags(req->rq_reqmsg) &
311 (MSG_RESENT | MSG_REPLAY |
312 MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
313 /* early replies, errors and recovery requests don't count
314 * toward our service time estimate */
315 int oldse = at_measured(&svcpt->scp_at_estimate, service_time);
316
317 if (oldse != 0) {
318 DEBUG_REQ(D_ADAPTTO, req,
319 "svc %s changed estimate from %d to %d",
320 svc->srv_name, oldse,
321 at_get(&svcpt->scp_at_estimate));
322 }
323 }
324 /* Report actual service time for client latency calc */
325 lustre_msg_set_service_time(req->rq_repmsg, service_time);
326 /* Report service time estimate for future client reqs, but report 0
327 * (to be ignored by client) if it's a error reply during recovery.
328 * (bz15815) */
329 if (req->rq_type == PTL_RPC_MSG_ERR && !req->rq_export)
330 lustre_msg_set_timeout(req->rq_repmsg, 0);
331 else
332 lustre_msg_set_timeout(req->rq_repmsg,
333 at_get(&svcpt->scp_at_estimate));
334
335 if (req->rq_reqmsg &&
336 !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
337 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x req_flags=%#x magic=%x/%x len=%d\n",
338 flags, lustre_msg_get_flags(req->rq_reqmsg),
339 lustre_msg_get_magic(req->rq_reqmsg),
340 lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
341 }
342 }
343
344 /**
345 * Send request reply from request \a req reply buffer.
346 * \a flags defines reply types
347 * Returns 0 on success or error code
348 */
ptlrpc_send_reply(struct ptlrpc_request * req,int flags)349 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
350 {
351 struct ptlrpc_reply_state *rs = req->rq_reply_state;
352 struct ptlrpc_connection *conn;
353 int rc;
354
355 /* We must already have a reply buffer (only ptlrpc_error() may be
356 * called without one). The reply generated by sptlrpc layer (e.g.
357 * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
358 * have a request buffer which is either the actual (swabbed) incoming
359 * request, or a saved copy if this is a req saved in
360 * target_queue_final_reply().
361 */
362 LASSERT(req->rq_no_reply == 0);
363 LASSERT(req->rq_reqbuf != NULL);
364 LASSERT(rs != NULL);
365 LASSERT((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
366 LASSERT(req->rq_repmsg != NULL);
367 LASSERT(req->rq_repmsg == rs->rs_msg);
368 LASSERT(rs->rs_cb_id.cbid_fn == reply_out_callback);
369 LASSERT(rs->rs_cb_id.cbid_arg == rs);
370
371 /* There may be no rq_export during failover */
372
373 if (unlikely(req->rq_export && req->rq_export->exp_obd &&
374 req->rq_export->exp_obd->obd_fail)) {
375 /* Failed obd's only send ENODEV */
376 req->rq_type = PTL_RPC_MSG_ERR;
377 req->rq_status = -ENODEV;
378 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
379 req->rq_export->exp_obd->obd_minor);
380 }
381
382 /* In order to keep interoperability with the client (< 2.3) which
383 * doesn't have pb_jobid in ptlrpc_body, We have to shrink the
384 * ptlrpc_body in reply buffer to ptlrpc_body_v2, otherwise, the
385 * reply buffer on client will be overflow.
386 *
387 * XXX Remove this whenever we drop the interoperability with
388 * such client.
389 */
390 req->rq_replen = lustre_shrink_msg(req->rq_repmsg, 0,
391 sizeof(struct ptlrpc_body_v2), 1);
392
393 if (req->rq_type != PTL_RPC_MSG_ERR)
394 req->rq_type = PTL_RPC_MSG_REPLY;
395
396 lustre_msg_set_type(req->rq_repmsg, req->rq_type);
397 lustre_msg_set_status(req->rq_repmsg,
398 ptlrpc_status_hton(req->rq_status));
399 lustre_msg_set_opc(req->rq_repmsg,
400 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
401
402 target_pack_pool_reply(req);
403
404 ptlrpc_at_set_reply(req, flags);
405
406 if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
407 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
408 else
409 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
410
411 if (unlikely(conn == NULL)) {
412 CERROR("not replying on NULL connection\n"); /* bug 9635 */
413 return -ENOTCONN;
414 }
415 ptlrpc_rs_addref(rs); /* +1 ref for the network */
416
417 rc = sptlrpc_svc_wrap_reply(req);
418 if (unlikely(rc))
419 goto out;
420
421 req->rq_sent = ktime_get_real_seconds();
422
423 rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
424 (rs->rs_difficult && !rs->rs_no_ack) ?
425 LNET_ACK_REQ : LNET_NOACK_REQ,
426 &rs->rs_cb_id, conn,
427 ptlrpc_req2svc(req)->srv_rep_portal,
428 req->rq_xid, req->rq_reply_off);
429 out:
430 if (unlikely(rc != 0))
431 ptlrpc_req_drop_rs(req);
432 ptlrpc_connection_put(conn);
433 return rc;
434 }
435 EXPORT_SYMBOL(ptlrpc_send_reply);
436
ptlrpc_reply(struct ptlrpc_request * req)437 int ptlrpc_reply(struct ptlrpc_request *req)
438 {
439 if (req->rq_no_reply)
440 return 0;
441 return ptlrpc_send_reply(req, 0);
442 }
443 EXPORT_SYMBOL(ptlrpc_reply);
444
445 /**
446 * For request \a req send an error reply back. Create empty
447 * reply buffers if necessary.
448 */
ptlrpc_send_error(struct ptlrpc_request * req,int may_be_difficult)449 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
450 {
451 int rc;
452
453 if (req->rq_no_reply)
454 return 0;
455
456 if (!req->rq_repmsg) {
457 rc = lustre_pack_reply(req, 1, NULL, NULL);
458 if (rc)
459 return rc;
460 }
461
462 if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
463 req->rq_status != -EPERM && req->rq_status != -ENOENT &&
464 req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
465 req->rq_type = PTL_RPC_MSG_ERR;
466
467 rc = ptlrpc_send_reply(req, may_be_difficult);
468 return rc;
469 }
470 EXPORT_SYMBOL(ptlrpc_send_error);
471
ptlrpc_error(struct ptlrpc_request * req)472 int ptlrpc_error(struct ptlrpc_request *req)
473 {
474 return ptlrpc_send_error(req, 0);
475 }
476 EXPORT_SYMBOL(ptlrpc_error);
477
478 /**
479 * Send request \a request.
480 * if \a noreply is set, don't expect any reply back and don't set up
481 * reply buffers.
482 * Returns 0 on success or error code.
483 */
ptl_send_rpc(struct ptlrpc_request * request,int noreply)484 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
485 {
486 int rc;
487 int rc2;
488 int mpflag = 0;
489 struct ptlrpc_connection *connection;
490 lnet_handle_me_t reply_me_h;
491 lnet_md_t reply_md;
492 struct obd_device *obd = request->rq_import->imp_obd;
493
494 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
495 return 0;
496
497 LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
498 LASSERT(request->rq_wait_ctx == 0);
499
500 /* If this is a re-transmit, we're required to have disengaged
501 * cleanly from the previous attempt */
502 LASSERT(!request->rq_receiving_reply);
503 LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
504 (request->rq_import->imp_state == LUSTRE_IMP_FULL)));
505
506 if (unlikely(obd != NULL && obd->obd_fail)) {
507 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
508 obd->obd_name);
509 /* this prevents us from waiting in ptlrpc_queue_wait */
510 spin_lock(&request->rq_lock);
511 request->rq_err = 1;
512 spin_unlock(&request->rq_lock);
513 request->rq_status = -ENODEV;
514 return -ENODEV;
515 }
516
517 connection = request->rq_import->imp_connection;
518
519 lustre_msg_set_handle(request->rq_reqmsg,
520 &request->rq_import->imp_remote_handle);
521 lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
522 lustre_msg_set_conn_cnt(request->rq_reqmsg,
523 request->rq_import->imp_conn_cnt);
524 lustre_msghdr_set_flags(request->rq_reqmsg,
525 request->rq_import->imp_msghdr_flags);
526
527 if (request->rq_resend)
528 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
529
530 if (request->rq_memalloc)
531 mpflag = cfs_memory_pressure_get_and_set();
532
533 rc = sptlrpc_cli_wrap_request(request);
534 if (rc)
535 goto out;
536
537 /* bulk register should be done after wrap_request() */
538 if (request->rq_bulk != NULL) {
539 rc = ptlrpc_register_bulk(request);
540 if (rc != 0)
541 goto out;
542 }
543
544 if (!noreply) {
545 LASSERT(request->rq_replen != 0);
546 if (request->rq_repbuf == NULL) {
547 LASSERT(request->rq_repdata == NULL);
548 LASSERT(request->rq_repmsg == NULL);
549 rc = sptlrpc_cli_alloc_repbuf(request,
550 request->rq_replen);
551 if (rc) {
552 /* this prevents us from looping in
553 * ptlrpc_queue_wait */
554 spin_lock(&request->rq_lock);
555 request->rq_err = 1;
556 spin_unlock(&request->rq_lock);
557 request->rq_status = rc;
558 goto cleanup_bulk;
559 }
560 } else {
561 request->rq_repdata = NULL;
562 request->rq_repmsg = NULL;
563 }
564
565 rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/
566 connection->c_peer, request->rq_xid, 0,
567 LNET_UNLINK, LNET_INS_AFTER, &reply_me_h);
568 if (rc != 0) {
569 CERROR("LNetMEAttach failed: %d\n", rc);
570 LASSERT(rc == -ENOMEM);
571 rc = -ENOMEM;
572 goto cleanup_bulk;
573 }
574 }
575
576 spin_lock(&request->rq_lock);
577 /* If the MD attach succeeds, there _will_ be a reply_in callback */
578 request->rq_receiving_reply = !noreply;
579 request->rq_req_unlink = 1;
580 /* We are responsible for unlinking the reply buffer */
581 request->rq_reply_unlink = !noreply;
582 /* Clear any flags that may be present from previous sends. */
583 request->rq_replied = 0;
584 request->rq_err = 0;
585 request->rq_timedout = 0;
586 request->rq_net_err = 0;
587 request->rq_resend = 0;
588 request->rq_restart = 0;
589 request->rq_reply_truncate = 0;
590 spin_unlock(&request->rq_lock);
591
592 if (!noreply) {
593 reply_md.start = request->rq_repbuf;
594 reply_md.length = request->rq_repbuf_len;
595 /* Allow multiple early replies */
596 reply_md.threshold = LNET_MD_THRESH_INF;
597 /* Manage remote for early replies */
598 reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
599 LNET_MD_MANAGE_REMOTE |
600 LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */
601 reply_md.user_ptr = &request->rq_reply_cbid;
602 reply_md.eq_handle = ptlrpc_eq_h;
603
604 /* We must see the unlink callback to unset rq_reply_unlink,
605 so we can't auto-unlink */
606 rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN,
607 &request->rq_reply_md_h);
608 if (rc != 0) {
609 CERROR("LNetMDAttach failed: %d\n", rc);
610 LASSERT(rc == -ENOMEM);
611 spin_lock(&request->rq_lock);
612 /* ...but the MD attach didn't succeed... */
613 request->rq_receiving_reply = 0;
614 spin_unlock(&request->rq_lock);
615 rc = -ENOMEM;
616 goto cleanup_me;
617 }
618
619 CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
620 request->rq_repbuf_len, request->rq_xid,
621 request->rq_reply_portal);
622 }
623
624 /* add references on request for request_out_callback */
625 ptlrpc_request_addref(request);
626 if (obd != NULL && obd->obd_svc_stats != NULL)
627 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
628 atomic_read(&request->rq_import->imp_inflight));
629
630 OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
631
632 ktime_get_real_ts64(&request->rq_arrival_time);
633 request->rq_sent = ktime_get_real_seconds();
634 /* We give the server rq_timeout secs to process the req, and
635 add the network latency for our local timeout. */
636 request->rq_deadline = request->rq_sent + request->rq_timeout +
637 ptlrpc_at_get_net_latency(request);
638
639 ptlrpc_pinger_sending_on_import(request->rq_import);
640
641 DEBUG_REQ(D_INFO, request, "send flg=%x",
642 lustre_msg_get_flags(request->rq_reqmsg));
643 rc = ptl_send_buf(&request->rq_req_md_h,
644 request->rq_reqbuf, request->rq_reqdata_len,
645 LNET_NOACK_REQ, &request->rq_req_cbid,
646 connection,
647 request->rq_request_portal,
648 request->rq_xid, 0);
649 if (rc == 0)
650 goto out;
651
652 ptlrpc_req_finished(request);
653 if (noreply)
654 goto out;
655
656 cleanup_me:
657 /* MEUnlink is safe; the PUT didn't even get off the ground, and
658 * nobody apart from the PUT's target has the right nid+XID to
659 * access the reply buffer. */
660 rc2 = LNetMEUnlink(reply_me_h);
661 LASSERT(rc2 == 0);
662 /* UNLINKED callback called synchronously */
663 LASSERT(!request->rq_receiving_reply);
664
665 cleanup_bulk:
666 /* We do sync unlink here as there was no real transfer here so
667 * the chance to have long unlink to sluggish net is smaller here. */
668 ptlrpc_unregister_bulk(request, 0);
669 out:
670 if (request->rq_memalloc)
671 cfs_memory_pressure_restore(mpflag);
672 return rc;
673 }
674 EXPORT_SYMBOL(ptl_send_rpc);
675
676 /**
677 * Register request buffer descriptor for request receiving.
678 */
ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc * rqbd)679 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
680 {
681 struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
682 static lnet_process_id_t match_id = {LNET_NID_ANY, LNET_PID_ANY};
683 int rc;
684 lnet_md_t md;
685 lnet_handle_me_t me_h;
686
687 CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
688 service->srv_req_portal);
689
690 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
691 return -ENOMEM;
692
693 /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
694 * which means buffer can only be attached on local CPT, and LND
695 * threads can find it by grabbing a local lock */
696 rc = LNetMEAttach(service->srv_req_portal,
697 match_id, 0, ~0, LNET_UNLINK,
698 rqbd->rqbd_svcpt->scp_cpt >= 0 ?
699 LNET_INS_LOCAL : LNET_INS_AFTER, &me_h);
700 if (rc != 0) {
701 CERROR("LNetMEAttach failed: %d\n", rc);
702 return -ENOMEM;
703 }
704
705 LASSERT(rqbd->rqbd_refcount == 0);
706 rqbd->rqbd_refcount = 1;
707
708 md.start = rqbd->rqbd_buffer;
709 md.length = service->srv_buf_size;
710 md.max_size = service->srv_max_req_size;
711 md.threshold = LNET_MD_THRESH_INF;
712 md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
713 md.user_ptr = &rqbd->rqbd_cbid;
714 md.eq_handle = ptlrpc_eq_h;
715
716 rc = LNetMDAttach(me_h, md, LNET_UNLINK, &rqbd->rqbd_md_h);
717 if (rc == 0)
718 return 0;
719
720 CERROR("LNetMDAttach failed: %d;\n", rc);
721 LASSERT(rc == -ENOMEM);
722 rc = LNetMEUnlink(me_h);
723 LASSERT(rc == 0);
724 rqbd->rqbd_refcount = 0;
725
726 return -ENOMEM;
727 }
728