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LU-13509 ptlrpc: Clear bd_registered in ptlrpc_unregister_bulk
[fs/lustre-release.git] / lustre / ptlrpc / niobuf.c
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.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2012, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  */
32
33 #define DEBUG_SUBSYSTEM S_RPC
34 #include <libcfs/linux/linux-mem.h>
35 #include <obd_support.h>
36 #include <lustre_net.h>
37 #include <lustre_lib.h>
38 #include <obd.h>
39 #include <obd_class.h>
40 #include "ptlrpc_internal.h"
41 #include <lnet/lib-lnet.h> /* for CFS_FAIL_PTLRPC_OST_BULK_CB2 */
42
43 /**
44  * Helper function. Sends \a len bytes from \a base at offset \a offset
45  * over \a conn connection to portal \a portal.
46  * Returns 0 on success or error code.
47  */
48 static int ptl_send_buf(struct lnet_handle_md *mdh, void *base, int len,
49                         enum lnet_ack_req ack, struct ptlrpc_cb_id *cbid,
50                         lnet_nid_t self, struct lnet_process_id peer_id,
51                         int portal, __u64 xid, unsigned int offset,
52                         struct lnet_handle_md *bulk_cookie)
53 {
54         int              rc;
55         struct lnet_md         md;
56         ENTRY;
57
58         LASSERT (portal != 0);
59         CDEBUG (D_INFO, "peer_id %s\n", libcfs_id2str(peer_id));
60         md.start     = base;
61         md.length    = len;
62         md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1;
63         md.options   = PTLRPC_MD_OPTIONS;
64         md.user_ptr  = cbid;
65         md.handler   = ptlrpc_handler;
66         LNetInvalidateMDHandle(&md.bulk_handle);
67
68         if (bulk_cookie) {
69                 md.bulk_handle = *bulk_cookie;
70                 md.options |= LNET_MD_BULK_HANDLE;
71         }
72
73         if (unlikely(ack == LNET_ACK_REQ &&
74                      OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){
75                 /* don't ask for the ack to simulate failing client */
76                 ack = LNET_NOACK_REQ;
77         }
78
79         rc = LNetMDBind(&md, LNET_UNLINK, mdh);
80         if (unlikely(rc != 0)) {
81                 CERROR ("LNetMDBind failed: %d\n", rc);
82                 LASSERT (rc == -ENOMEM);
83                 RETURN (-ENOMEM);
84         }
85
86         CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n",
87                len, portal, xid, offset);
88
89         percpu_ref_get(&ptlrpc_pending);
90
91         rc = LNetPut(self, *mdh, ack,
92                      peer_id, portal, xid, offset, 0);
93         if (unlikely(rc != 0)) {
94                 int rc2;
95                 /* We're going to get an UNLINK event when I unlink below,
96                  * which will complete just like any other failed send, so
97                  * I fall through and return success here! */
98                 CERROR("LNetPut(%s, %d, %lld) failed: %d\n",
99                        libcfs_id2str(peer_id), portal, xid, rc);
100                 rc2 = LNetMDUnlink(*mdh);
101                 LASSERTF(rc2 == 0, "rc2 = %d\n", rc2);
102         }
103
104         RETURN (0);
105 }
106
107 static void mdunlink_iterate_helper(struct lnet_handle_md *bd_mds, int count)
108 {
109         int i;
110
111         for (i = 0; i < count; i++)
112                 LNetMDUnlink(bd_mds[i]);
113 }
114
115 #ifdef HAVE_SERVER_SUPPORT
116 /**
117  * Prepare bulk descriptor for specified incoming request \a req that
118  * can fit \a nfrags * pages. \a type is bulk type. \a portal is where
119  * the bulk to be sent. Used on server-side after request was already
120  * received.
121  * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
122  * error.
123  */
124 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
125                                               unsigned nfrags, unsigned max_brw,
126                                               unsigned int type,
127                                               unsigned portal,
128                                               const struct ptlrpc_bulk_frag_ops
129                                                 *ops)
130 {
131         struct obd_export *exp = req->rq_export;
132         struct ptlrpc_bulk_desc *desc;
133
134         ENTRY;
135         LASSERT(ptlrpc_is_bulk_op_active(type));
136
137         desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops);
138         if (desc == NULL)
139                 RETURN(NULL);
140
141         desc->bd_export = class_export_get(exp);
142         desc->bd_req = req;
143
144         desc->bd_cbid.cbid_fn  = server_bulk_callback;
145         desc->bd_cbid.cbid_arg = desc;
146
147         /* NB we don't assign rq_bulk here; server-side requests are
148          * re-used, and the handler frees the bulk desc explicitly. */
149
150         return desc;
151 }
152 EXPORT_SYMBOL(ptlrpc_prep_bulk_exp);
153
154 /**
155  * Starts bulk transfer for descriptor \a desc on the server.
156  * Returns 0 on success or error code.
157  */
158 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc)
159 {
160         struct obd_export        *exp = desc->bd_export;
161         lnet_nid_t                self_nid;
162         struct lnet_process_id    peer_id;
163         int                       rc = 0;
164         __u64                     mbits;
165         int                       posted_md;
166         int                       total_md;
167         struct lnet_md                 md;
168         ENTRY;
169
170         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET))
171                 RETURN(0);
172
173         /* NB no locking required until desc is on the network */
174         LASSERT(desc->bd_md_count == 0);
175         LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type));
176
177         LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback);
178         LASSERT(desc->bd_cbid.cbid_arg == desc);
179
180         /*
181          * Multi-Rail: get the preferred self and peer NIDs from the
182          * request, so they are based on the route taken by the
183          * message.
184          */
185         self_nid = desc->bd_req->rq_self;
186         peer_id = desc->bd_req->rq_source;
187
188         /* NB total length may be 0 for a read past EOF, so we send 0
189          * length bulks, since the client expects bulk events.
190          *
191          * The client may not need all of the bulk mbits for the RPC. The RPC
192          * used the mbits of the highest bulk mbits needed, and the server masks
193          * off high bits to get bulk count for this RPC. LU-1431 */
194         mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1);
195         total_md = desc->bd_req->rq_mbits - mbits + 1;
196
197         desc->bd_md_count = total_md;
198         desc->bd_failure = 0;
199
200         md.user_ptr = &desc->bd_cbid;
201         md.handler = ptlrpc_handler;
202         md.threshold = 2; /* SENT and ACK/REPLY */
203
204         for (posted_md = 0; posted_md < total_md; mbits++) {
205                 md.options = PTLRPC_MD_OPTIONS;
206
207                 /* NB it's assumed that source and sink buffer frags are
208                  * page-aligned. Otherwise we'd have to send client bulk
209                  * sizes over and split server buffer accordingly */
210                 ptlrpc_fill_bulk_md(&md, desc, posted_md);
211                 rc = LNetMDBind(&md, LNET_UNLINK, &desc->bd_mds[posted_md]);
212                 if (rc != 0) {
213                         CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n",
214                                exp->exp_obd->obd_name, posted_md, rc);
215                         LASSERT(rc == -ENOMEM);
216                         if (posted_md == 0) {
217                                 desc->bd_md_count = 0;
218                                 RETURN(-ENOMEM);
219                         }
220                         break;
221                 }
222                 percpu_ref_get(&ptlrpc_pending);
223
224                 /* sanity.sh 224c: lets skip last md */
225                 if (posted_md == desc->bd_md_max_brw - 1)
226                         OBD_FAIL_CHECK_RESET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3,
227                                              CFS_FAIL_PTLRPC_OST_BULK_CB2);
228
229                 /* Network is about to get at the memory */
230                 if (ptlrpc_is_bulk_put_source(desc->bd_type))
231                         rc = LNetPut(self_nid, desc->bd_mds[posted_md],
232                                      LNET_ACK_REQ, peer_id,
233                                      desc->bd_portal, mbits, 0, 0);
234                 else
235                         rc = LNetGet(self_nid, desc->bd_mds[posted_md],
236                                      peer_id, desc->bd_portal, mbits, 0, false);
237
238                 posted_md++;
239                 if (rc != 0) {
240                         CERROR("%s: failed bulk transfer with %s:%u x%llu: "
241                                "rc = %d\n", exp->exp_obd->obd_name,
242                                libcfs_id2str(peer_id), desc->bd_portal,
243                                mbits, rc);
244                         break;
245                 }
246         }
247
248         if (rc != 0) {
249                 /* Can't send, so we unlink the MD bound above.  The UNLINK
250                  * event this creates will signal completion with failure,
251                  * so we return SUCCESS here! */
252                 spin_lock(&desc->bd_lock);
253                 desc->bd_md_count -= total_md - posted_md;
254                 spin_unlock(&desc->bd_lock);
255                 LASSERT(desc->bd_md_count >= 0);
256
257                 mdunlink_iterate_helper(desc->bd_mds, posted_md);
258                 RETURN(0);
259         }
260
261         CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d "
262                "id %s mbits %#llx-%#llx\n", desc->bd_iov_count,
263                desc->bd_nob, desc->bd_portal, libcfs_id2str(peer_id),
264                mbits - posted_md, mbits - 1);
265
266         RETURN(0);
267 }
268
269 /**
270  * Server side bulk abort. Idempotent. Not thread-safe (i.e. only
271  * serialises with completion callback)
272  */
273 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc)
274 {
275         LASSERT(!in_interrupt());           /* might sleep */
276
277         if (!ptlrpc_server_bulk_active(desc))   /* completed or */
278                 return;                         /* never started */
279
280         /* We used to poison the pages with 0xab here because we did not want to
281          * send any meaningful data over the wire for evicted clients (bug 9297)
282          * However, this is no longer safe now that we use the page cache on the
283          * OSS (bug 20560) */
284
285         /* The unlink ensures the callback happens ASAP and is the last
286          * one.  If it fails, it must be because completion just happened,
287          * but we must still wait_event_idle_timeout() in this case, to give
288          * us a chance to run server_bulk_callback()
289          */
290         mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
291
292         for (;;) {
293                 /* Network access will complete in finite time but the HUGE
294                  * timeout lets us CWARN for visibility of sluggish NALs */
295                 int seconds = PTLRPC_REQ_LONG_UNLINK;
296
297                 while (seconds > 0 &&
298                        wait_event_idle_timeout(desc->bd_waitq,
299                                                !ptlrpc_server_bulk_active(desc),
300                                                cfs_time_seconds(1)) == 0)
301                         seconds -= 1;
302                 if (seconds > 0)
303                         return;
304
305                 CWARN("Unexpectedly long timeout: desc %p\n", desc);
306         }
307 }
308 #endif /* HAVE_SERVER_SUPPORT */
309
310 /**
311  * Register bulk at the sender for later transfer.
312  * Returns 0 on success or error code.
313  */
314 int ptlrpc_register_bulk(struct ptlrpc_request *req)
315 {
316         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
317         struct lnet_process_id peer;
318         int rc = 0;
319         int posted_md;
320         int total_md;
321         __u64 mbits;
322         struct lnet_me *me;
323         struct lnet_md md;
324         ENTRY;
325
326         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET))
327                 RETURN(0);
328
329         /* NB no locking required until desc is on the network */
330         LASSERT(desc->bd_nob > 0);
331         LASSERT(desc->bd_md_count == 0);
332         LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT);
333         LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
334         LASSERT(desc->bd_req != NULL);
335         LASSERT(ptlrpc_is_bulk_op_passive(desc->bd_type));
336
337         /* cleanup the state of the bulk for it will be reused */
338         if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY)
339                 desc->bd_nob_transferred = 0;
340         else if (desc->bd_nob_transferred != 0)
341                 /* If the network failed after an RPC was sent, this condition
342                  * could happen.  Rather than assert (was here before), return
343                  * an EIO error. */
344                 RETURN(-EIO);
345
346         desc->bd_failure = 0;
347
348         peer = desc->bd_import->imp_connection->c_peer;
349
350         LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback);
351         LASSERT(desc->bd_cbid.cbid_arg == desc);
352
353         total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
354         /* rq_mbits is matchbits of the final bulk */
355         mbits = req->rq_mbits - total_md + 1;
356
357         LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK),
358                  "first mbits = x%llu, last mbits = x%llu\n",
359                  mbits, req->rq_mbits);
360         LASSERTF(!(desc->bd_registered &&
361                    req->rq_send_state != LUSTRE_IMP_REPLAY) ||
362                  mbits != desc->bd_last_mbits,
363                  "registered: %d  rq_mbits: %llu bd_last_mbits: %llu\n",
364                  desc->bd_registered, mbits, desc->bd_last_mbits);
365
366         desc->bd_registered = 1;
367         desc->bd_last_mbits = mbits;
368         desc->bd_md_count = total_md;
369         md.user_ptr = &desc->bd_cbid;
370         md.handler = ptlrpc_handler;
371         md.threshold = 1;                       /* PUT or GET */
372
373         for (posted_md = 0; posted_md < total_md; posted_md++, mbits++) {
374                 md.options = PTLRPC_MD_OPTIONS |
375                              (ptlrpc_is_bulk_op_get(desc->bd_type) ?
376                               LNET_MD_OP_GET : LNET_MD_OP_PUT);
377                 ptlrpc_fill_bulk_md(&md, desc, posted_md);
378
379                 if (posted_md > 0 && posted_md + 1 == total_md &&
380                     OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) {
381                         rc = -ENOMEM;
382                 } else {
383                         me = LNetMEAttach(desc->bd_portal, peer, mbits, 0,
384                                   LNET_UNLINK, LNET_INS_AFTER);
385                         rc = PTR_ERR_OR_ZERO(me);
386                 }
387                 if (rc != 0) {
388                         CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n",
389                                desc->bd_import->imp_obd->obd_name, mbits,
390                                posted_md, rc);
391                         break;
392                 }
393                 percpu_ref_get(&ptlrpc_pending);
394
395                 /* About to let the network at it... */
396                 rc = LNetMDAttach(me, &md, LNET_UNLINK,
397                                   &desc->bd_mds[posted_md]);
398                 if (rc != 0) {
399                         CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n",
400                                desc->bd_import->imp_obd->obd_name, mbits,
401                                posted_md, rc);
402                         LNetMEUnlink(me);
403                         break;
404                 }
405         }
406
407         if (rc != 0) {
408                 LASSERT(rc == -ENOMEM);
409                 spin_lock(&desc->bd_lock);
410                 desc->bd_md_count -= total_md - posted_md;
411                 spin_unlock(&desc->bd_lock);
412                 LASSERT(desc->bd_md_count >= 0);
413                 mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
414                 req->rq_status = -ENOMEM;
415                 desc->bd_registered = 0;
416                 RETURN(-ENOMEM);
417         }
418
419         spin_lock(&desc->bd_lock);
420         /* Holler if peer manages to touch buffers before he knows the mbits */
421         if (desc->bd_md_count != total_md)
422                 CWARN("%s: Peer %s touched %d buffers while I registered\n",
423                       desc->bd_import->imp_obd->obd_name, libcfs_id2str(peer),
424                       total_md - desc->bd_md_count);
425         spin_unlock(&desc->bd_lock);
426
427         CDEBUG(D_NET, "Setup %u bulk %s buffers: %u pages %u bytes, "
428                "mbits x%#llx-%#llx, portal %u\n", desc->bd_md_count,
429                ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink",
430                desc->bd_iov_count, desc->bd_nob,
431                desc->bd_last_mbits, req->rq_mbits, desc->bd_portal);
432
433         RETURN(0);
434 }
435
436 /**
437  * Disconnect a bulk desc from the network. Idempotent. Not
438  * thread-safe (i.e. only interlocks with completion callback).
439  * Returns 1 on success or 0 if network unregistration failed for whatever
440  * reason.
441  */
442 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
443 {
444         struct ptlrpc_bulk_desc *desc = req->rq_bulk;
445         ENTRY;
446
447         LASSERT(!in_interrupt());     /* might sleep */
448
449         if (desc)
450                 desc->bd_registered = 0;
451
452         /* Let's setup deadline for reply unlink. */
453         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
454             async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0)
455                 req->rq_bulk_deadline = ktime_get_real_seconds() +
456                                         PTLRPC_REQ_LONG_UNLINK;
457
458         if (ptlrpc_client_bulk_active(req) == 0)        /* completed or */
459                 RETURN(1);                              /* never registered */
460
461         LASSERT(desc->bd_req == req);  /* bd_req NULL until registered */
462
463         /* the unlink ensures the callback happens ASAP and is the last
464          * one.  If it fails, it must be because completion just happened,
465          * but we must still wait_event_idle_timeout() in this case to give
466          * us a chance to run client_bulk_callback()
467          */
468         mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw);
469
470         if (ptlrpc_client_bulk_active(req) == 0)        /* completed or */
471                 RETURN(1);                              /* never registered */
472
473         /* Move to "Unregistering" phase as bulk was not unlinked yet. */
474         ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK);
475
476         /* Do not wait for unlink to finish. */
477         if (async)
478                 RETURN(0);
479
480         for (;;) {
481                 /* The wq argument is ignored by user-space wait_event macros */
482                 wait_queue_head_t *wq = (req->rq_set != NULL) ?
483                                         &req->rq_set->set_waitq :
484                                         &req->rq_reply_waitq;
485                 /*
486                  * Network access will complete in finite time but the HUGE
487                  * timeout lets us CWARN for visibility of sluggish NALs.
488                  */
489                 int seconds = PTLRPC_REQ_LONG_UNLINK;
490
491                 while (seconds > 0 &&
492                        wait_event_idle_timeout(*wq,
493                                                !ptlrpc_client_bulk_active(req),
494                                                cfs_time_seconds(1)) == 0)
495                         seconds -= 1;
496                 if (seconds > 0) {
497                         ptlrpc_rqphase_move(req, req->rq_next_phase);
498                         RETURN(1);
499                 }
500
501                 DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p",
502                           desc);
503         }
504         RETURN(0);
505 }
506
507 static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
508 {
509         struct ptlrpc_service_part      *svcpt = req->rq_rqbd->rqbd_svcpt;
510         struct ptlrpc_service           *svc = svcpt->scp_service;
511         timeout_t service_timeout;
512
513         service_timeout = clamp_t(timeout_t, ktime_get_real_seconds() -
514                                              req->rq_arrival_time.tv_sec, 1,
515                                   (AT_OFF ? obd_timeout * 3 / 2 : at_max));
516         if (!(flags & PTLRPC_REPLY_EARLY) &&
517             (req->rq_type != PTL_RPC_MSG_ERR) &&
518             (req->rq_reqmsg != NULL) &&
519             !(lustre_msg_get_flags(req->rq_reqmsg) &
520               (MSG_RESENT | MSG_REPLAY |
521                MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) {
522                 /* early replies, errors and recovery requests don't count
523                  * toward our service time estimate
524                  */
525                 timeout_t oldse = at_measured(&svcpt->scp_at_estimate,
526                                               service_timeout);
527
528                 if (oldse != 0) {
529                         DEBUG_REQ(D_ADAPTTO, req,
530                                   "svc %s changed estimate from %d to %d",
531                                   svc->srv_name, oldse,
532                                   at_get(&svcpt->scp_at_estimate));
533                 }
534         }
535         /* Report actual service time for client latency calc */
536         lustre_msg_set_service_timeout(req->rq_repmsg, service_timeout);
537         /* Report service time estimate for future client reqs, but report 0
538          * (to be ignored by client) if it's an error reply during recovery.
539          * b=15815
540          */
541         if (req->rq_type == PTL_RPC_MSG_ERR &&
542             (req->rq_export == NULL ||
543              req->rq_export->exp_obd->obd_recovering)) {
544                 lustre_msg_set_timeout(req->rq_repmsg, 0);
545         } else {
546                 timeout_t timeout;
547
548                 if (req->rq_export && req->rq_reqmsg != NULL &&
549                     (flags & PTLRPC_REPLY_EARLY) &&
550                     lustre_msg_get_flags(req->rq_reqmsg) &
551                     (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
552                         struct obd_device *exp_obd = req->rq_export->exp_obd;
553
554                         timeout = ktime_get_real_seconds() -
555                                   req->rq_arrival_time.tv_sec +
556                                   min_t(timeout_t, at_extra,
557                                         exp_obd->obd_recovery_timeout / 4);
558                 } else {
559                         timeout = at_get(&svcpt->scp_at_estimate);
560                 }
561                 lustre_msg_set_timeout(req->rq_repmsg, timeout);
562         }
563
564         if (req->rq_reqmsg &&
565             !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
566                 CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x "
567                        "req_flags=%#x magic=%x/%x len=%d\n",
568                        flags, lustre_msg_get_flags(req->rq_reqmsg),
569                        lustre_msg_get_magic(req->rq_reqmsg),
570                        lustre_msg_get_magic(req->rq_repmsg), req->rq_replen);
571         }
572 }
573
574 /**
575  * Send request reply from request \a req reply buffer.
576  * \a flags defines reply types
577  * Returns 0 on success or error code
578  */
579 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
580 {
581         struct ptlrpc_reply_state *rs = req->rq_reply_state;
582         struct ptlrpc_connection  *conn;
583         int                        rc;
584
585         /* We must already have a reply buffer (only ptlrpc_error() may be
586          * called without one). The reply generated by sptlrpc layer (e.g.
587          * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must
588          * have a request buffer which is either the actual (swabbed) incoming
589          * request, or a saved copy if this is a req saved in
590          * target_queue_final_reply().
591          */
592         LASSERT (req->rq_no_reply == 0);
593         LASSERT (req->rq_reqbuf != NULL);
594         LASSERT (rs != NULL);
595         LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult);
596         LASSERT (req->rq_repmsg != NULL);
597         LASSERT (req->rq_repmsg == rs->rs_msg);
598         LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback);
599         LASSERT (rs->rs_cb_id.cbid_arg == rs);
600
601         /* There may be no rq_export during failover */
602
603         if (unlikely(req->rq_export && req->rq_export->exp_obd &&
604                      req->rq_export->exp_obd->obd_fail)) {
605                 /* Failed obd's only send ENODEV */
606                 req->rq_type = PTL_RPC_MSG_ERR;
607                 req->rq_status = -ENODEV;
608                 CDEBUG(D_HA, "sending ENODEV from failed obd %d\n",
609                        req->rq_export->exp_obd->obd_minor);
610         }
611
612         if (req->rq_type != PTL_RPC_MSG_ERR)
613                 req->rq_type = PTL_RPC_MSG_REPLY;
614
615         lustre_msg_set_type(req->rq_repmsg, req->rq_type);
616         lustre_msg_set_status(req->rq_repmsg,
617                               ptlrpc_status_hton(req->rq_status));
618         lustre_msg_set_opc(req->rq_repmsg,
619                 req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0);
620
621         target_pack_pool_reply(req);
622
623         ptlrpc_at_set_reply(req, flags);
624
625         if (req->rq_export == NULL || req->rq_export->exp_connection == NULL)
626                 conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL);
627         else
628                 conn = ptlrpc_connection_addref(req->rq_export->exp_connection);
629
630         if (unlikely(conn == NULL)) {
631                 CERROR("not replying on NULL connection\n"); /* bug 9635 */
632                 return -ENOTCONN;
633         }
634         ptlrpc_rs_addref(rs);                   /* +1 ref for the network */
635
636         rc = sptlrpc_svc_wrap_reply(req);
637         if (unlikely(rc))
638                 goto out;
639
640         req->rq_sent = ktime_get_real_seconds();
641
642         rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
643                           (rs->rs_difficult && !rs->rs_no_ack) ?
644                           LNET_ACK_REQ : LNET_NOACK_REQ,
645                           &rs->rs_cb_id, req->rq_self, req->rq_source,
646                           ptlrpc_req2svc(req)->srv_rep_portal,
647                           req->rq_xid, req->rq_reply_off, NULL);
648 out:
649         if (unlikely(rc != 0))
650                 ptlrpc_req_drop_rs(req);
651         ptlrpc_connection_put(conn);
652         return rc;
653 }
654
655 int ptlrpc_reply (struct ptlrpc_request *req)
656 {
657         if (req->rq_no_reply)
658                 return 0;
659         else
660                 return (ptlrpc_send_reply(req, 0));
661 }
662
663 /**
664  * For request \a req send an error reply back. Create empty
665  * reply buffers if necessary.
666  */
667 int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult)
668 {
669         int rc;
670         ENTRY;
671
672         if (req->rq_no_reply)
673                 RETURN(0);
674
675         if (!req->rq_repmsg) {
676                 rc = lustre_pack_reply(req, 1, NULL, NULL);
677                 if (rc)
678                         RETURN(rc);
679         }
680
681         if (req->rq_status != -ENOSPC && req->rq_status != -EACCES &&
682             req->rq_status != -EPERM && req->rq_status != -ENOENT &&
683             req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT)
684                 req->rq_type = PTL_RPC_MSG_ERR;
685
686         rc = ptlrpc_send_reply(req, may_be_difficult);
687         RETURN(rc);
688 }
689
690 int ptlrpc_error(struct ptlrpc_request *req)
691 {
692         return ptlrpc_send_error(req, 0);
693 }
694
695 /**
696  * Send request \a request.
697  * if \a noreply is set, don't expect any reply back and don't set up
698  * reply buffers.
699  * Returns 0 on success or error code.
700  */
701 int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
702 {
703         int rc;
704         int mpflag = 0;
705         struct lnet_handle_md bulk_cookie;
706         struct ptlrpc_connection *connection;
707         struct lnet_me *reply_me = NULL;
708         struct lnet_md reply_md;
709         struct obd_import *imp = request->rq_import;
710         struct obd_device *obd = imp->imp_obd;
711         ENTRY;
712
713         LNetInvalidateMDHandle(&bulk_cookie);
714
715         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
716                 RETURN(0);
717
718         LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
719         LASSERT(request->rq_wait_ctx == 0);
720
721         /* If this is a re-transmit, we're required to have disengaged
722          * cleanly from the previous attempt */
723         LASSERT(!request->rq_receiving_reply);
724         LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
725                 (imp->imp_state == LUSTRE_IMP_FULL)));
726
727         if (unlikely(obd != NULL && obd->obd_fail)) {
728                 CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
729                         obd->obd_name);
730                 /* this prevents us from waiting in ptlrpc_queue_wait */
731                 spin_lock(&request->rq_lock);
732                 request->rq_err = 1;
733                 spin_unlock(&request->rq_lock);
734                 request->rq_status = -ENODEV;
735                 RETURN(-ENODEV);
736         }
737
738         connection = imp->imp_connection;
739
740         lustre_msg_set_handle(request->rq_reqmsg,
741                               &imp->imp_remote_handle);
742         lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
743         lustre_msg_set_conn_cnt(request->rq_reqmsg,
744                                 imp->imp_conn_cnt);
745         lustre_msghdr_set_flags(request->rq_reqmsg,
746                                 imp->imp_msghdr_flags);
747
748         /* If it's the first time to resend the request for EINPROGRESS,
749          * we need to allocate a new XID (see after_reply()), it's different
750          * from the resend for reply timeout. */
751         if (request->rq_nr_resend != 0 &&
752             list_empty(&request->rq_unreplied_list)) {
753                 __u64 min_xid = 0;
754                 /* resend for EINPROGRESS, allocate new xid to avoid reply
755                  * reconstruction */
756                 spin_lock(&imp->imp_lock);
757                 ptlrpc_assign_next_xid_nolock(request);
758                 min_xid = ptlrpc_known_replied_xid(imp);
759                 spin_unlock(&imp->imp_lock);
760
761                 lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
762                 DEBUG_REQ(D_RPCTRACE, request,
763                           "Allocating new XID for resend on EINPROGRESS");
764         }
765
766         if (request->rq_bulk != NULL) {
767                 ptlrpc_set_bulk_mbits(request);
768                 lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
769         }
770
771         if (list_empty(&request->rq_unreplied_list) ||
772             request->rq_xid <= imp->imp_known_replied_xid) {
773                 DEBUG_REQ(D_ERROR, request,
774                           "xid=%llu, replied=%llu, list_empty=%d",
775                           request->rq_xid, imp->imp_known_replied_xid,
776                           list_empty(&request->rq_unreplied_list));
777                 LBUG();
778         }
779
780         /** For enabled AT all request should have AT_SUPPORT in the
781          * FULL import state when OBD_CONNECT_AT is set */
782         LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
783                 (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
784                 !(imp->imp_connect_data.ocd_connect_flags &
785                 OBD_CONNECT_AT));
786
787         if (request->rq_resend) {
788                 lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);
789                 if (request->rq_resend_cb != NULL)
790                         request->rq_resend_cb(request, &request->rq_async_args);
791         }
792         if (request->rq_memalloc)
793                 mpflag = memalloc_noreclaim_save();
794
795         rc = sptlrpc_cli_wrap_request(request);
796         if (rc)
797                 GOTO(out, rc);
798
799         /* bulk register should be done after wrap_request() */
800         if (request->rq_bulk != NULL) {
801                 rc = ptlrpc_register_bulk (request);
802                 if (rc != 0)
803                         GOTO(cleanup_bulk, rc);
804                 /*
805                  * All the mds in the request will have the same cpt
806                  * encoded in the cookie. So we can just get the first
807                  * one.
808                  */
809                 bulk_cookie = request->rq_bulk->bd_mds[0];
810         }
811
812         if (!noreply) {
813                 LASSERT (request->rq_replen != 0);
814                 if (request->rq_repbuf == NULL) {
815                         LASSERT(request->rq_repdata == NULL);
816                         LASSERT(request->rq_repmsg == NULL);
817                         rc = sptlrpc_cli_alloc_repbuf(request,
818                                                       request->rq_replen);
819                         if (rc) {
820                                 /* this prevents us from looping in
821                                  * ptlrpc_queue_wait */
822                                 spin_lock(&request->rq_lock);
823                                 request->rq_err = 1;
824                                 spin_unlock(&request->rq_lock);
825                                 request->rq_status = rc;
826                                 GOTO(cleanup_bulk, rc);
827                         }
828                 } else {
829                         request->rq_repdata = NULL;
830                         request->rq_repmsg = NULL;
831                 }
832
833                 if (request->rq_bulk &&
834                     OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_REPLY_ATTACH)) {
835                         reply_me = ERR_PTR(-ENOMEM);
836                 } else {
837                         reply_me = LNetMEAttach(request->rq_reply_portal,
838                                                 connection->c_peer,
839                                                 request->rq_xid, 0,
840                                                 LNET_UNLINK, LNET_INS_AFTER);
841                 }
842
843                 if (IS_ERR(reply_me)) {
844                         rc = PTR_ERR(reply_me);
845                         CERROR("LNetMEAttach failed: %d\n", rc);
846                         LASSERT(rc == -ENOMEM);
847                         GOTO(cleanup_bulk, rc = -ENOMEM);
848                 }
849         }
850
851         spin_lock(&request->rq_lock);
852         /* We are responsible for unlinking the reply buffer */
853         request->rq_reply_unlinked = noreply;
854         request->rq_receiving_reply = !noreply;
855         /* Clear any flags that may be present from previous sends. */
856         request->rq_req_unlinked = 0;
857         request->rq_replied = 0;
858         request->rq_err = 0;
859         request->rq_timedout = 0;
860         request->rq_net_err = 0;
861         request->rq_resend = 0;
862         request->rq_restart = 0;
863         request->rq_reply_truncated = 0;
864         spin_unlock(&request->rq_lock);
865
866         if (!noreply) {
867                 reply_md.start     = request->rq_repbuf;
868                 reply_md.length    = request->rq_repbuf_len;
869                 /* Allow multiple early replies */
870                 reply_md.threshold = LNET_MD_THRESH_INF;
871                 /* Manage remote for early replies */
872                 reply_md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
873                         LNET_MD_MANAGE_REMOTE |
874                         LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */;
875                 reply_md.user_ptr  = &request->rq_reply_cbid;
876                 reply_md.handler = ptlrpc_handler;
877
878                 /* We must see the unlink callback to set rq_reply_unlinked,
879                  * so we can't auto-unlink */
880                 rc = LNetMDAttach(reply_me, &reply_md, LNET_RETAIN,
881                                   &request->rq_reply_md_h);
882                 if (rc != 0) {
883                         CERROR("LNetMDAttach failed: %d\n", rc);
884                         LASSERT(rc == -ENOMEM);
885                         spin_lock(&request->rq_lock);
886                         /* ...but the MD attach didn't succeed... */
887                         request->rq_receiving_reply = 0;
888                         spin_unlock(&request->rq_lock);
889                         GOTO(cleanup_me, rc = -ENOMEM);
890                 }
891                 percpu_ref_get(&ptlrpc_pending);
892
893                 CDEBUG(D_NET,
894                        "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
895                        request->rq_repbuf_len, request->rq_xid,
896                        request->rq_reply_portal);
897         }
898
899         /* add references on request for request_out_callback */
900         ptlrpc_request_addref(request);
901         if (obd != NULL && obd->obd_svc_stats != NULL)
902                 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
903                         atomic_read(&imp->imp_inflight));
904
905         OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
906
907         request->rq_sent_ns = ktime_get_real();
908         request->rq_sent = ktime_get_real_seconds();
909         /* We give the server rq_timeout secs to process the req, and
910            add the network latency for our local timeout. */
911         request->rq_deadline = request->rq_sent + request->rq_timeout +
912                 ptlrpc_at_get_net_latency(request);
913
914         ptlrpc_pinger_sending_on_import(imp);
915
916         DEBUG_REQ(D_INFO, request, "send flags=%x",
917                   lustre_msg_get_flags(request->rq_reqmsg));
918         rc = ptl_send_buf(&request->rq_req_md_h,
919                           request->rq_reqbuf, request->rq_reqdata_len,
920                           LNET_NOACK_REQ, &request->rq_req_cbid,
921                           LNET_NID_ANY, connection->c_peer,
922                           request->rq_request_portal,
923                           request->rq_xid, 0, &bulk_cookie);
924         if (likely(rc == 0))
925                 GOTO(out, rc);
926
927         request->rq_req_unlinked = 1;
928         ptlrpc_req_finished(request);
929         if (noreply)
930                 GOTO(out, rc);
931
932  cleanup_me:
933         /* MEUnlink is safe; the PUT didn't even get off the ground, and
934          * nobody apart from the PUT's target has the right nid+XID to
935          * access the reply buffer.
936          */
937         LNetMEUnlink(reply_me);
938         /* UNLINKED callback called synchronously */
939         LASSERT(!request->rq_receiving_reply);
940
941  cleanup_bulk:
942         /* We do sync unlink here as there was no real transfer here so
943          * the chance to have long unlink to sluggish net is smaller here. */
944         ptlrpc_unregister_bulk(request, 0);
945  out:
946         if (rc == -ENOMEM) {
947                 /* set rq_sent so that this request is treated
948                  * as a delayed send in the upper layers */
949                 request->rq_sent = ktime_get_real_seconds();
950         }
951
952         if (request->rq_memalloc)
953                 memalloc_noreclaim_restore(mpflag);
954
955         return rc;
956 }
957 EXPORT_SYMBOL(ptl_send_rpc);
958
959 /**
960  * Register request buffer descriptor for request receiving.
961  */
962 int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
963 {
964         struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service;
965         static struct lnet_process_id match_id = {
966                 .nid = LNET_NID_ANY,
967                 .pid = LNET_PID_ANY
968         };
969         int rc;
970         struct lnet_md md;
971         struct lnet_me *me;
972
973         CDEBUG(D_NET, "LNetMEAttach: portal %d\n",
974                service->srv_req_portal);
975
976         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD))
977                 return (-ENOMEM);
978
979         /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL,
980          * which means buffer can only be attached on local CPT, and LND
981          * threads can find it by grabbing a local lock */
982         me = LNetMEAttach(service->srv_req_portal,
983                           match_id, 0, ~0, LNET_UNLINK,
984                           rqbd->rqbd_svcpt->scp_cpt >= 0 ?
985                           LNET_INS_LOCAL : LNET_INS_AFTER);
986         if (IS_ERR(me)) {
987                 CERROR("LNetMEAttach failed: %ld\n", PTR_ERR(me));
988                 return -ENOMEM;
989         }
990
991         LASSERT(rqbd->rqbd_refcount == 0);
992         rqbd->rqbd_refcount = 1;
993
994         md.start     = rqbd->rqbd_buffer;
995         md.length    = service->srv_buf_size;
996         md.max_size  = service->srv_max_req_size;
997         md.threshold = LNET_MD_THRESH_INF;
998         md.options   = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE;
999         md.user_ptr  = &rqbd->rqbd_cbid;
1000         md.handler   = ptlrpc_handler;
1001
1002         rc = LNetMDAttach(me, &md, LNET_UNLINK, &rqbd->rqbd_md_h);
1003         if (rc == 0) {
1004                 percpu_ref_get(&ptlrpc_pending);
1005                 return 0;
1006         }
1007
1008         CERROR("ptlrpc: LNetMDAttach failed: rc = %d\n", rc);
1009         LASSERT(rc == -ENOMEM);
1010         LNetMEUnlink(me);
1011         LASSERT(rc == 0);
1012         rqbd->rqbd_refcount = 0;
1013
1014         return -ENOMEM;
1015 }