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Merge tag 'dropmachtimexh-v2' of git://git.pengutronix.de/git/ukl/linux into next...
[deliverable/linux.git] / drivers / staging / lustre / lnet / lnet / lib-move.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.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) 2003, 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 * lnet/lnet/lib-move.c
37 *
38 * Data movement routines
39 */
40
41 #define DEBUG_SUBSYSTEM S_LNET
42
43 #include <linux/lnet/lib-lnet.h>
44
45 static int local_nid_dist_zero = 1;
46 module_param(local_nid_dist_zero, int, 0444);
47 MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
48
49 int
50 lnet_fail_nid(lnet_nid_t nid, unsigned int threshold)
51 {
52 lnet_test_peer_t *tp;
53 struct list_head *el;
54 struct list_head *next;
55 struct list_head cull;
56
57 LASSERT(the_lnet.ln_init);
58
59 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
60 if (threshold != 0) {
61 /* Adding a new entry */
62 LIBCFS_ALLOC(tp, sizeof(*tp));
63 if (tp == NULL)
64 return -ENOMEM;
65
66 tp->tp_nid = nid;
67 tp->tp_threshold = threshold;
68
69 lnet_net_lock(0);
70 list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers);
71 lnet_net_unlock(0);
72 return 0;
73 }
74
75 /* removing entries */
76 INIT_LIST_HEAD(&cull);
77
78 lnet_net_lock(0);
79
80 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
81 tp = list_entry(el, lnet_test_peer_t, tp_list);
82
83 if (tp->tp_threshold == 0 || /* needs culling anyway */
84 nid == LNET_NID_ANY || /* removing all entries */
85 tp->tp_nid == nid) { /* matched this one */
86 list_del(&tp->tp_list);
87 list_add(&tp->tp_list, &cull);
88 }
89 }
90
91 lnet_net_unlock(0);
92
93 while (!list_empty(&cull)) {
94 tp = list_entry(cull.next, lnet_test_peer_t, tp_list);
95
96 list_del(&tp->tp_list);
97 LIBCFS_FREE(tp, sizeof(*tp));
98 }
99 return 0;
100 }
101
102 static int
103 fail_peer(lnet_nid_t nid, int outgoing)
104 {
105 lnet_test_peer_t *tp;
106 struct list_head *el;
107 struct list_head *next;
108 struct list_head cull;
109 int fail = 0;
110
111 INIT_LIST_HEAD(&cull);
112
113 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
114 lnet_net_lock(0);
115
116 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
117 tp = list_entry(el, lnet_test_peer_t, tp_list);
118
119 if (tp->tp_threshold == 0) {
120 /* zombie entry */
121 if (outgoing) {
122 /* only cull zombies on outgoing tests,
123 * since we may be at interrupt priority on
124 * incoming messages. */
125 list_del(&tp->tp_list);
126 list_add(&tp->tp_list, &cull);
127 }
128 continue;
129 }
130
131 if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */
132 nid == tp->tp_nid) { /* fail this peer */
133 fail = 1;
134
135 if (tp->tp_threshold != LNET_MD_THRESH_INF) {
136 tp->tp_threshold--;
137 if (outgoing &&
138 tp->tp_threshold == 0) {
139 /* see above */
140 list_del(&tp->tp_list);
141 list_add(&tp->tp_list, &cull);
142 }
143 }
144 break;
145 }
146 }
147
148 lnet_net_unlock(0);
149
150 while (!list_empty(&cull)) {
151 tp = list_entry(cull.next, lnet_test_peer_t, tp_list);
152 list_del(&tp->tp_list);
153
154 LIBCFS_FREE(tp, sizeof(*tp));
155 }
156
157 return fail;
158 }
159
160 unsigned int
161 lnet_iov_nob(unsigned int niov, struct iovec *iov)
162 {
163 unsigned int nob = 0;
164
165 while (niov-- > 0)
166 nob += (iov++)->iov_len;
167
168 return nob;
169 }
170 EXPORT_SYMBOL(lnet_iov_nob);
171
172 void
173 lnet_copy_iov2iov(unsigned int ndiov, struct iovec *diov, unsigned int doffset,
174 unsigned int nsiov, struct iovec *siov, unsigned int soffset,
175 unsigned int nob)
176 {
177 /* NB diov, siov are READ-ONLY */
178 unsigned int this_nob;
179
180 if (nob == 0)
181 return;
182
183 /* skip complete frags before 'doffset' */
184 LASSERT(ndiov > 0);
185 while (doffset >= diov->iov_len) {
186 doffset -= diov->iov_len;
187 diov++;
188 ndiov--;
189 LASSERT(ndiov > 0);
190 }
191
192 /* skip complete frags before 'soffset' */
193 LASSERT(nsiov > 0);
194 while (soffset >= siov->iov_len) {
195 soffset -= siov->iov_len;
196 siov++;
197 nsiov--;
198 LASSERT(nsiov > 0);
199 }
200
201 do {
202 LASSERT(ndiov > 0);
203 LASSERT(nsiov > 0);
204 this_nob = MIN(diov->iov_len - doffset,
205 siov->iov_len - soffset);
206 this_nob = MIN(this_nob, nob);
207
208 memcpy((char *)diov->iov_base + doffset,
209 (char *)siov->iov_base + soffset, this_nob);
210 nob -= this_nob;
211
212 if (diov->iov_len > doffset + this_nob) {
213 doffset += this_nob;
214 } else {
215 diov++;
216 ndiov--;
217 doffset = 0;
218 }
219
220 if (siov->iov_len > soffset + this_nob) {
221 soffset += this_nob;
222 } else {
223 siov++;
224 nsiov--;
225 soffset = 0;
226 }
227 } while (nob > 0);
228 }
229 EXPORT_SYMBOL(lnet_copy_iov2iov);
230
231 int
232 lnet_extract_iov(int dst_niov, struct iovec *dst,
233 int src_niov, struct iovec *src,
234 unsigned int offset, unsigned int len)
235 {
236 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
237 * for exactly 'len' bytes, and return the number of entries.
238 * NB not destructive to 'src' */
239 unsigned int frag_len;
240 unsigned int niov;
241
242 if (len == 0) /* no data => */
243 return 0; /* no frags */
244
245 LASSERT(src_niov > 0);
246 while (offset >= src->iov_len) { /* skip initial frags */
247 offset -= src->iov_len;
248 src_niov--;
249 src++;
250 LASSERT(src_niov > 0);
251 }
252
253 niov = 1;
254 for (;;) {
255 LASSERT(src_niov > 0);
256 LASSERT((int)niov <= dst_niov);
257
258 frag_len = src->iov_len - offset;
259 dst->iov_base = ((char *)src->iov_base) + offset;
260
261 if (len <= frag_len) {
262 dst->iov_len = len;
263 return niov;
264 }
265
266 dst->iov_len = frag_len;
267
268 len -= frag_len;
269 dst++;
270 src++;
271 niov++;
272 src_niov--;
273 offset = 0;
274 }
275 }
276 EXPORT_SYMBOL(lnet_extract_iov);
277
278
279 unsigned int
280 lnet_kiov_nob(unsigned int niov, lnet_kiov_t *kiov)
281 {
282 unsigned int nob = 0;
283
284 while (niov-- > 0)
285 nob += (kiov++)->kiov_len;
286
287 return nob;
288 }
289 EXPORT_SYMBOL(lnet_kiov_nob);
290
291 void
292 lnet_copy_kiov2kiov(unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset,
293 unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset,
294 unsigned int nob)
295 {
296 /* NB diov, siov are READ-ONLY */
297 unsigned int this_nob;
298 char *daddr = NULL;
299 char *saddr = NULL;
300
301 if (nob == 0)
302 return;
303
304 LASSERT(!in_interrupt());
305
306 LASSERT(ndiov > 0);
307 while (doffset >= diov->kiov_len) {
308 doffset -= diov->kiov_len;
309 diov++;
310 ndiov--;
311 LASSERT(ndiov > 0);
312 }
313
314 LASSERT(nsiov > 0);
315 while (soffset >= siov->kiov_len) {
316 soffset -= siov->kiov_len;
317 siov++;
318 nsiov--;
319 LASSERT(nsiov > 0);
320 }
321
322 do {
323 LASSERT(ndiov > 0);
324 LASSERT(nsiov > 0);
325 this_nob = MIN(diov->kiov_len - doffset,
326 siov->kiov_len - soffset);
327 this_nob = MIN(this_nob, nob);
328
329 if (daddr == NULL)
330 daddr = ((char *)kmap(diov->kiov_page)) +
331 diov->kiov_offset + doffset;
332 if (saddr == NULL)
333 saddr = ((char *)kmap(siov->kiov_page)) +
334 siov->kiov_offset + soffset;
335
336 /* Vanishing risk of kmap deadlock when mapping 2 pages.
337 * However in practice at least one of the kiovs will be mapped
338 * kernel pages and the map/unmap will be NOOPs */
339
340 memcpy(daddr, saddr, this_nob);
341 nob -= this_nob;
342
343 if (diov->kiov_len > doffset + this_nob) {
344 daddr += this_nob;
345 doffset += this_nob;
346 } else {
347 kunmap(diov->kiov_page);
348 daddr = NULL;
349 diov++;
350 ndiov--;
351 doffset = 0;
352 }
353
354 if (siov->kiov_len > soffset + this_nob) {
355 saddr += this_nob;
356 soffset += this_nob;
357 } else {
358 kunmap(siov->kiov_page);
359 saddr = NULL;
360 siov++;
361 nsiov--;
362 soffset = 0;
363 }
364 } while (nob > 0);
365
366 if (daddr != NULL)
367 kunmap(diov->kiov_page);
368 if (saddr != NULL)
369 kunmap(siov->kiov_page);
370 }
371 EXPORT_SYMBOL(lnet_copy_kiov2kiov);
372
373 void
374 lnet_copy_kiov2iov(unsigned int niov, struct iovec *iov, unsigned int iovoffset,
375 unsigned int nkiov, lnet_kiov_t *kiov,
376 unsigned int kiovoffset, unsigned int nob)
377 {
378 /* NB iov, kiov are READ-ONLY */
379 unsigned int this_nob;
380 char *addr = NULL;
381
382 if (nob == 0)
383 return;
384
385 LASSERT(!in_interrupt());
386
387 LASSERT(niov > 0);
388 while (iovoffset >= iov->iov_len) {
389 iovoffset -= iov->iov_len;
390 iov++;
391 niov--;
392 LASSERT(niov > 0);
393 }
394
395 LASSERT(nkiov > 0);
396 while (kiovoffset >= kiov->kiov_len) {
397 kiovoffset -= kiov->kiov_len;
398 kiov++;
399 nkiov--;
400 LASSERT(nkiov > 0);
401 }
402
403 do {
404 LASSERT(niov > 0);
405 LASSERT(nkiov > 0);
406 this_nob = MIN(iov->iov_len - iovoffset,
407 kiov->kiov_len - kiovoffset);
408 this_nob = MIN(this_nob, nob);
409
410 if (addr == NULL)
411 addr = ((char *)kmap(kiov->kiov_page)) +
412 kiov->kiov_offset + kiovoffset;
413
414 memcpy((char *)iov->iov_base + iovoffset, addr, this_nob);
415 nob -= this_nob;
416
417 if (iov->iov_len > iovoffset + this_nob) {
418 iovoffset += this_nob;
419 } else {
420 iov++;
421 niov--;
422 iovoffset = 0;
423 }
424
425 if (kiov->kiov_len > kiovoffset + this_nob) {
426 addr += this_nob;
427 kiovoffset += this_nob;
428 } else {
429 kunmap(kiov->kiov_page);
430 addr = NULL;
431 kiov++;
432 nkiov--;
433 kiovoffset = 0;
434 }
435
436 } while (nob > 0);
437
438 if (addr != NULL)
439 kunmap(kiov->kiov_page);
440 }
441 EXPORT_SYMBOL(lnet_copy_kiov2iov);
442
443 void
444 lnet_copy_iov2kiov(unsigned int nkiov, lnet_kiov_t *kiov,
445 unsigned int kiovoffset, unsigned int niov,
446 struct iovec *iov, unsigned int iovoffset,
447 unsigned int nob)
448 {
449 /* NB kiov, iov are READ-ONLY */
450 unsigned int this_nob;
451 char *addr = NULL;
452
453 if (nob == 0)
454 return;
455
456 LASSERT(!in_interrupt());
457
458 LASSERT(nkiov > 0);
459 while (kiovoffset >= kiov->kiov_len) {
460 kiovoffset -= kiov->kiov_len;
461 kiov++;
462 nkiov--;
463 LASSERT(nkiov > 0);
464 }
465
466 LASSERT(niov > 0);
467 while (iovoffset >= iov->iov_len) {
468 iovoffset -= iov->iov_len;
469 iov++;
470 niov--;
471 LASSERT(niov > 0);
472 }
473
474 do {
475 LASSERT(nkiov > 0);
476 LASSERT(niov > 0);
477 this_nob = MIN(kiov->kiov_len - kiovoffset,
478 iov->iov_len - iovoffset);
479 this_nob = MIN(this_nob, nob);
480
481 if (addr == NULL)
482 addr = ((char *)kmap(kiov->kiov_page)) +
483 kiov->kiov_offset + kiovoffset;
484
485 memcpy(addr, (char *)iov->iov_base + iovoffset, this_nob);
486 nob -= this_nob;
487
488 if (kiov->kiov_len > kiovoffset + this_nob) {
489 addr += this_nob;
490 kiovoffset += this_nob;
491 } else {
492 kunmap(kiov->kiov_page);
493 addr = NULL;
494 kiov++;
495 nkiov--;
496 kiovoffset = 0;
497 }
498
499 if (iov->iov_len > iovoffset + this_nob) {
500 iovoffset += this_nob;
501 } else {
502 iov++;
503 niov--;
504 iovoffset = 0;
505 }
506 } while (nob > 0);
507
508 if (addr != NULL)
509 kunmap(kiov->kiov_page);
510 }
511 EXPORT_SYMBOL(lnet_copy_iov2kiov);
512
513 int
514 lnet_extract_kiov(int dst_niov, lnet_kiov_t *dst,
515 int src_niov, lnet_kiov_t *src,
516 unsigned int offset, unsigned int len)
517 {
518 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
519 * for exactly 'len' bytes, and return the number of entries.
520 * NB not destructive to 'src' */
521 unsigned int frag_len;
522 unsigned int niov;
523
524 if (len == 0) /* no data => */
525 return 0; /* no frags */
526
527 LASSERT(src_niov > 0);
528 while (offset >= src->kiov_len) { /* skip initial frags */
529 offset -= src->kiov_len;
530 src_niov--;
531 src++;
532 LASSERT(src_niov > 0);
533 }
534
535 niov = 1;
536 for (;;) {
537 LASSERT(src_niov > 0);
538 LASSERT((int)niov <= dst_niov);
539
540 frag_len = src->kiov_len - offset;
541 dst->kiov_page = src->kiov_page;
542 dst->kiov_offset = src->kiov_offset + offset;
543
544 if (len <= frag_len) {
545 dst->kiov_len = len;
546 LASSERT(dst->kiov_offset + dst->kiov_len
547 <= PAGE_CACHE_SIZE);
548 return niov;
549 }
550
551 dst->kiov_len = frag_len;
552 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_CACHE_SIZE);
553
554 len -= frag_len;
555 dst++;
556 src++;
557 niov++;
558 src_niov--;
559 offset = 0;
560 }
561 }
562 EXPORT_SYMBOL(lnet_extract_kiov);
563
564 void
565 lnet_ni_recv(lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
566 unsigned int offset, unsigned int mlen, unsigned int rlen)
567 {
568 unsigned int niov = 0;
569 struct iovec *iov = NULL;
570 lnet_kiov_t *kiov = NULL;
571 int rc;
572
573 LASSERT(!in_interrupt());
574 LASSERT(mlen == 0 || msg != NULL);
575
576 if (msg != NULL) {
577 LASSERT(msg->msg_receiving);
578 LASSERT(!msg->msg_sending);
579 LASSERT(rlen == msg->msg_len);
580 LASSERT(mlen <= msg->msg_len);
581 LASSERT(msg->msg_offset == offset);
582 LASSERT(msg->msg_wanted == mlen);
583
584 msg->msg_receiving = 0;
585
586 if (mlen != 0) {
587 niov = msg->msg_niov;
588 iov = msg->msg_iov;
589 kiov = msg->msg_kiov;
590
591 LASSERT(niov > 0);
592 LASSERT((iov == NULL) != (kiov == NULL));
593 }
594 }
595
596 rc = (ni->ni_lnd->lnd_recv)(ni, private, msg, delayed,
597 niov, iov, kiov, offset, mlen, rlen);
598 if (rc < 0)
599 lnet_finalize(ni, msg, rc);
600 }
601
602 void
603 lnet_setpayloadbuffer(lnet_msg_t *msg)
604 {
605 lnet_libmd_t *md = msg->msg_md;
606
607 LASSERT(msg->msg_len > 0);
608 LASSERT(!msg->msg_routing);
609 LASSERT(md != NULL);
610 LASSERT(msg->msg_niov == 0);
611 LASSERT(msg->msg_iov == NULL);
612 LASSERT(msg->msg_kiov == NULL);
613
614 msg->msg_niov = md->md_niov;
615 if ((md->md_options & LNET_MD_KIOV) != 0)
616 msg->msg_kiov = md->md_iov.kiov;
617 else
618 msg->msg_iov = md->md_iov.iov;
619 }
620
621 void
622 lnet_prep_send(lnet_msg_t *msg, int type, lnet_process_id_t target,
623 unsigned int offset, unsigned int len)
624 {
625 msg->msg_type = type;
626 msg->msg_target = target;
627 msg->msg_len = len;
628 msg->msg_offset = offset;
629
630 if (len != 0)
631 lnet_setpayloadbuffer(msg);
632
633 memset(&msg->msg_hdr, 0, sizeof(msg->msg_hdr));
634 msg->msg_hdr.type = cpu_to_le32(type);
635 msg->msg_hdr.dest_nid = cpu_to_le64(target.nid);
636 msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
637 /* src_nid will be set later */
638 msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
639 msg->msg_hdr.payload_length = cpu_to_le32(len);
640 }
641
642 void
643 lnet_ni_send(lnet_ni_t *ni, lnet_msg_t *msg)
644 {
645 void *priv = msg->msg_private;
646 int rc;
647
648 LASSERT(!in_interrupt());
649 LASSERT(LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
650 (msg->msg_txcredit && msg->msg_peertxcredit));
651
652 rc = (ni->ni_lnd->lnd_send)(ni, priv, msg);
653 if (rc < 0)
654 lnet_finalize(ni, msg, rc);
655 }
656
657 int
658 lnet_ni_eager_recv(lnet_ni_t *ni, lnet_msg_t *msg)
659 {
660 int rc;
661
662 LASSERT(!msg->msg_sending);
663 LASSERT(msg->msg_receiving);
664 LASSERT(!msg->msg_rx_ready_delay);
665 LASSERT(ni->ni_lnd->lnd_eager_recv != NULL);
666
667 msg->msg_rx_ready_delay = 1;
668 rc = (ni->ni_lnd->lnd_eager_recv)(ni, msg->msg_private, msg,
669 &msg->msg_private);
670 if (rc != 0) {
671 CERROR("recv from %s / send to %s aborted: "
672 "eager_recv failed %d\n",
673 libcfs_nid2str(msg->msg_rxpeer->lp_nid),
674 libcfs_id2str(msg->msg_target), rc);
675 LASSERT(rc < 0); /* required by my callers */
676 }
677
678 return rc;
679 }
680
681 /* NB: caller shall hold a ref on 'lp' as I'd drop lnet_net_lock */
682 void
683 lnet_ni_query_locked(lnet_ni_t *ni, lnet_peer_t *lp)
684 {
685 cfs_time_t last_alive = 0;
686
687 LASSERT(lnet_peer_aliveness_enabled(lp));
688 LASSERT(ni->ni_lnd->lnd_query != NULL);
689
690 lnet_net_unlock(lp->lp_cpt);
691 (ni->ni_lnd->lnd_query)(ni, lp->lp_nid, &last_alive);
692 lnet_net_lock(lp->lp_cpt);
693
694 lp->lp_last_query = cfs_time_current();
695
696 if (last_alive != 0) /* NI has updated timestamp */
697 lp->lp_last_alive = last_alive;
698 }
699
700 /* NB: always called with lnet_net_lock held */
701 static inline int
702 lnet_peer_is_alive(lnet_peer_t *lp, cfs_time_t now)
703 {
704 int alive;
705 cfs_time_t deadline;
706
707 LASSERT(lnet_peer_aliveness_enabled(lp));
708
709 /* Trust lnet_notify() if it has more recent aliveness news, but
710 * ignore the initial assumed death (see lnet_peers_start_down()).
711 */
712 if (!lp->lp_alive && lp->lp_alive_count > 0 &&
713 cfs_time_aftereq(lp->lp_timestamp, lp->lp_last_alive))
714 return 0;
715
716 deadline = cfs_time_add(lp->lp_last_alive,
717 cfs_time_seconds(lp->lp_ni->ni_peertimeout));
718 alive = cfs_time_after(deadline, now);
719
720 /* Update obsolete lp_alive except for routers assumed to be dead
721 * initially, because router checker would update aliveness in this
722 * case, and moreover lp_last_alive at peer creation is assumed.
723 */
724 if (alive && !lp->lp_alive &&
725 !(lnet_isrouter(lp) && lp->lp_alive_count == 0))
726 lnet_notify_locked(lp, 0, 1, lp->lp_last_alive);
727
728 return alive;
729 }
730
731
732 /* NB: returns 1 when alive, 0 when dead, negative when error;
733 * may drop the lnet_net_lock */
734 int
735 lnet_peer_alive_locked(lnet_peer_t *lp)
736 {
737 cfs_time_t now = cfs_time_current();
738
739 if (!lnet_peer_aliveness_enabled(lp))
740 return -ENODEV;
741
742 if (lnet_peer_is_alive(lp, now))
743 return 1;
744
745 /* Peer appears dead, but we should avoid frequent NI queries (at
746 * most once per lnet_queryinterval seconds). */
747 if (lp->lp_last_query != 0) {
748 static const int lnet_queryinterval = 1;
749
750 cfs_time_t next_query =
751 cfs_time_add(lp->lp_last_query,
752 cfs_time_seconds(lnet_queryinterval));
753
754 if (cfs_time_before(now, next_query)) {
755 if (lp->lp_alive)
756 CWARN("Unexpected aliveness of peer %s: "
757 "%d < %d (%d/%d)\n",
758 libcfs_nid2str(lp->lp_nid),
759 (int)now, (int)next_query,
760 lnet_queryinterval,
761 lp->lp_ni->ni_peertimeout);
762 return 0;
763 }
764 }
765
766 /* query NI for latest aliveness news */
767 lnet_ni_query_locked(lp->lp_ni, lp);
768
769 if (lnet_peer_is_alive(lp, now))
770 return 1;
771
772 lnet_notify_locked(lp, 0, 0, lp->lp_last_alive);
773 return 0;
774 }
775
776 int
777 lnet_post_send_locked(lnet_msg_t *msg, int do_send)
778 {
779 /* lnet_send is going to lnet_net_unlock immediately after this,
780 * so it sets do_send FALSE and I don't do the unlock/send/lock bit.
781 * I return EAGAIN if msg blocked, EHOSTUNREACH if msg_txpeer
782 * appears dead, and 0 if sent or OK to send */
783 struct lnet_peer *lp = msg->msg_txpeer;
784 struct lnet_ni *ni = lp->lp_ni;
785 struct lnet_tx_queue *tq;
786 int cpt;
787
788 /* non-lnet_send() callers have checked before */
789 LASSERT(!do_send || msg->msg_tx_delayed);
790 LASSERT(!msg->msg_receiving);
791 LASSERT(msg->msg_tx_committed);
792
793 cpt = msg->msg_tx_cpt;
794 tq = ni->ni_tx_queues[cpt];
795
796 /* NB 'lp' is always the next hop */
797 if ((msg->msg_target.pid & LNET_PID_USERFLAG) == 0 &&
798 lnet_peer_alive_locked(lp) == 0) {
799 the_lnet.ln_counters[cpt]->drop_count++;
800 the_lnet.ln_counters[cpt]->drop_length += msg->msg_len;
801 lnet_net_unlock(cpt);
802
803 CNETERR("Dropping message for %s: peer not alive\n",
804 libcfs_id2str(msg->msg_target));
805 if (do_send)
806 lnet_finalize(ni, msg, -EHOSTUNREACH);
807
808 lnet_net_lock(cpt);
809 return EHOSTUNREACH;
810 }
811
812 if (!msg->msg_peertxcredit) {
813 LASSERT((lp->lp_txcredits < 0) ==
814 !list_empty(&lp->lp_txq));
815
816 msg->msg_peertxcredit = 1;
817 lp->lp_txqnob += msg->msg_len + sizeof(lnet_hdr_t);
818 lp->lp_txcredits--;
819
820 if (lp->lp_txcredits < lp->lp_mintxcredits)
821 lp->lp_mintxcredits = lp->lp_txcredits;
822
823 if (lp->lp_txcredits < 0) {
824 msg->msg_tx_delayed = 1;
825 list_add_tail(&msg->msg_list, &lp->lp_txq);
826 return EAGAIN;
827 }
828 }
829
830 if (!msg->msg_txcredit) {
831 LASSERT((tq->tq_credits < 0) ==
832 !list_empty(&tq->tq_delayed));
833
834 msg->msg_txcredit = 1;
835 tq->tq_credits--;
836
837 if (tq->tq_credits < tq->tq_credits_min)
838 tq->tq_credits_min = tq->tq_credits;
839
840 if (tq->tq_credits < 0) {
841 msg->msg_tx_delayed = 1;
842 list_add_tail(&msg->msg_list, &tq->tq_delayed);
843 return EAGAIN;
844 }
845 }
846
847 if (do_send) {
848 lnet_net_unlock(cpt);
849 lnet_ni_send(ni, msg);
850 lnet_net_lock(cpt);
851 }
852 return 0;
853 }
854
855
856 lnet_rtrbufpool_t *
857 lnet_msg2bufpool(lnet_msg_t *msg)
858 {
859 lnet_rtrbufpool_t *rbp;
860 int cpt;
861
862 LASSERT(msg->msg_rx_committed);
863
864 cpt = msg->msg_rx_cpt;
865 rbp = &the_lnet.ln_rtrpools[cpt][0];
866
867 LASSERT(msg->msg_len <= LNET_MTU);
868 while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_CACHE_SIZE) {
869 rbp++;
870 LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]);
871 }
872
873 return rbp;
874 }
875
876 int
877 lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv)
878 {
879 /* lnet_parse is going to lnet_net_unlock immediately after this, so it
880 * sets do_recv FALSE and I don't do the unlock/send/lock bit. I
881 * return EAGAIN if msg blocked and 0 if received or OK to receive */
882 lnet_peer_t *lp = msg->msg_rxpeer;
883 lnet_rtrbufpool_t *rbp;
884 lnet_rtrbuf_t *rb;
885
886 LASSERT(msg->msg_iov == NULL);
887 LASSERT(msg->msg_kiov == NULL);
888 LASSERT(msg->msg_niov == 0);
889 LASSERT(msg->msg_routing);
890 LASSERT(msg->msg_receiving);
891 LASSERT(!msg->msg_sending);
892
893 /* non-lnet_parse callers only receive delayed messages */
894 LASSERT(!do_recv || msg->msg_rx_delayed);
895
896 if (!msg->msg_peerrtrcredit) {
897 LASSERT((lp->lp_rtrcredits < 0) ==
898 !list_empty(&lp->lp_rtrq));
899
900 msg->msg_peerrtrcredit = 1;
901 lp->lp_rtrcredits--;
902 if (lp->lp_rtrcredits < lp->lp_minrtrcredits)
903 lp->lp_minrtrcredits = lp->lp_rtrcredits;
904
905 if (lp->lp_rtrcredits < 0) {
906 /* must have checked eager_recv before here */
907 LASSERT(msg->msg_rx_ready_delay);
908 msg->msg_rx_delayed = 1;
909 list_add_tail(&msg->msg_list, &lp->lp_rtrq);
910 return EAGAIN;
911 }
912 }
913
914 rbp = lnet_msg2bufpool(msg);
915
916 if (!msg->msg_rtrcredit) {
917 LASSERT((rbp->rbp_credits < 0) ==
918 !list_empty(&rbp->rbp_msgs));
919
920 msg->msg_rtrcredit = 1;
921 rbp->rbp_credits--;
922 if (rbp->rbp_credits < rbp->rbp_mincredits)
923 rbp->rbp_mincredits = rbp->rbp_credits;
924
925 if (rbp->rbp_credits < 0) {
926 /* must have checked eager_recv before here */
927 LASSERT(msg->msg_rx_ready_delay);
928 msg->msg_rx_delayed = 1;
929 list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
930 return EAGAIN;
931 }
932 }
933
934 LASSERT(!list_empty(&rbp->rbp_bufs));
935 rb = list_entry(rbp->rbp_bufs.next, lnet_rtrbuf_t, rb_list);
936 list_del(&rb->rb_list);
937
938 msg->msg_niov = rbp->rbp_npages;
939 msg->msg_kiov = &rb->rb_kiov[0];
940
941 if (do_recv) {
942 int cpt = msg->msg_rx_cpt;
943
944 lnet_net_unlock(cpt);
945 lnet_ni_recv(lp->lp_ni, msg->msg_private, msg, 1,
946 0, msg->msg_len, msg->msg_len);
947 lnet_net_lock(cpt);
948 }
949 return 0;
950 }
951
952 void
953 lnet_return_tx_credits_locked(lnet_msg_t *msg)
954 {
955 lnet_peer_t *txpeer = msg->msg_txpeer;
956 lnet_msg_t *msg2;
957
958 if (msg->msg_txcredit) {
959 struct lnet_ni *ni = txpeer->lp_ni;
960 struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt];
961
962 /* give back NI txcredits */
963 msg->msg_txcredit = 0;
964
965 LASSERT((tq->tq_credits < 0) ==
966 !list_empty(&tq->tq_delayed));
967
968 tq->tq_credits++;
969 if (tq->tq_credits <= 0) {
970 msg2 = list_entry(tq->tq_delayed.next,
971 lnet_msg_t, msg_list);
972 list_del(&msg2->msg_list);
973
974 LASSERT(msg2->msg_txpeer->lp_ni == ni);
975 LASSERT(msg2->msg_tx_delayed);
976
977 (void) lnet_post_send_locked(msg2, 1);
978 }
979 }
980
981 if (msg->msg_peertxcredit) {
982 /* give back peer txcredits */
983 msg->msg_peertxcredit = 0;
984
985 LASSERT((txpeer->lp_txcredits < 0) ==
986 !list_empty(&txpeer->lp_txq));
987
988 txpeer->lp_txqnob -= msg->msg_len + sizeof(lnet_hdr_t);
989 LASSERT(txpeer->lp_txqnob >= 0);
990
991 txpeer->lp_txcredits++;
992 if (txpeer->lp_txcredits <= 0) {
993 msg2 = list_entry(txpeer->lp_txq.next,
994 lnet_msg_t, msg_list);
995 list_del(&msg2->msg_list);
996
997 LASSERT(msg2->msg_txpeer == txpeer);
998 LASSERT(msg2->msg_tx_delayed);
999
1000 (void) lnet_post_send_locked(msg2, 1);
1001 }
1002 }
1003
1004 if (txpeer != NULL) {
1005 msg->msg_txpeer = NULL;
1006 lnet_peer_decref_locked(txpeer);
1007 }
1008 }
1009
1010 void
1011 lnet_return_rx_credits_locked(lnet_msg_t *msg)
1012 {
1013 lnet_peer_t *rxpeer = msg->msg_rxpeer;
1014 lnet_msg_t *msg2;
1015
1016 if (msg->msg_rtrcredit) {
1017 /* give back global router credits */
1018 lnet_rtrbuf_t *rb;
1019 lnet_rtrbufpool_t *rbp;
1020
1021 /* NB If a msg ever blocks for a buffer in rbp_msgs, it stays
1022 * there until it gets one allocated, or aborts the wait
1023 * itself */
1024 LASSERT(msg->msg_kiov != NULL);
1025
1026 rb = list_entry(msg->msg_kiov, lnet_rtrbuf_t, rb_kiov[0]);
1027 rbp = rb->rb_pool;
1028 LASSERT(rbp == lnet_msg2bufpool(msg));
1029
1030 msg->msg_kiov = NULL;
1031 msg->msg_rtrcredit = 0;
1032
1033 LASSERT((rbp->rbp_credits < 0) ==
1034 !list_empty(&rbp->rbp_msgs));
1035 LASSERT((rbp->rbp_credits > 0) ==
1036 !list_empty(&rbp->rbp_bufs));
1037
1038 list_add(&rb->rb_list, &rbp->rbp_bufs);
1039 rbp->rbp_credits++;
1040 if (rbp->rbp_credits <= 0) {
1041 msg2 = list_entry(rbp->rbp_msgs.next,
1042 lnet_msg_t, msg_list);
1043 list_del(&msg2->msg_list);
1044
1045 (void) lnet_post_routed_recv_locked(msg2, 1);
1046 }
1047 }
1048
1049 if (msg->msg_peerrtrcredit) {
1050 /* give back peer router credits */
1051 msg->msg_peerrtrcredit = 0;
1052
1053 LASSERT((rxpeer->lp_rtrcredits < 0) ==
1054 !list_empty(&rxpeer->lp_rtrq));
1055
1056 rxpeer->lp_rtrcredits++;
1057 if (rxpeer->lp_rtrcredits <= 0) {
1058 msg2 = list_entry(rxpeer->lp_rtrq.next,
1059 lnet_msg_t, msg_list);
1060 list_del(&msg2->msg_list);
1061
1062 (void) lnet_post_routed_recv_locked(msg2, 1);
1063 }
1064 }
1065 if (rxpeer != NULL) {
1066 msg->msg_rxpeer = NULL;
1067 lnet_peer_decref_locked(rxpeer);
1068 }
1069 }
1070
1071 static int
1072 lnet_compare_routes(lnet_route_t *r1, lnet_route_t *r2)
1073 {
1074 lnet_peer_t *p1 = r1->lr_gateway;
1075 lnet_peer_t *p2 = r2->lr_gateway;
1076
1077 if (r1->lr_priority < r2->lr_priority)
1078 return 1;
1079
1080 if (r1->lr_priority > r2->lr_priority)
1081 return -1;
1082
1083 if (r1->lr_hops < r2->lr_hops)
1084 return 1;
1085
1086 if (r1->lr_hops > r2->lr_hops)
1087 return -1;
1088
1089 if (p1->lp_txqnob < p2->lp_txqnob)
1090 return 1;
1091
1092 if (p1->lp_txqnob > p2->lp_txqnob)
1093 return -1;
1094
1095 if (p1->lp_txcredits > p2->lp_txcredits)
1096 return 1;
1097
1098 if (p1->lp_txcredits < p2->lp_txcredits)
1099 return -1;
1100
1101 if (r1->lr_seq - r2->lr_seq <= 0)
1102 return 1;
1103
1104 return -1;
1105 }
1106
1107 static lnet_peer_t *
1108 lnet_find_route_locked(lnet_ni_t *ni, lnet_nid_t target, lnet_nid_t rtr_nid)
1109 {
1110 lnet_remotenet_t *rnet;
1111 lnet_route_t *rtr;
1112 lnet_route_t *rtr_best;
1113 lnet_route_t *rtr_last;
1114 struct lnet_peer *lp_best;
1115 struct lnet_peer *lp;
1116 int rc;
1117
1118 /* If @rtr_nid is not LNET_NID_ANY, return the gateway with
1119 * rtr_nid nid, otherwise find the best gateway I can use */
1120
1121 rnet = lnet_find_net_locked(LNET_NIDNET(target));
1122 if (rnet == NULL)
1123 return NULL;
1124
1125 lp_best = NULL;
1126 rtr_best = rtr_last = NULL;
1127 list_for_each_entry(rtr, &rnet->lrn_routes, lr_list) {
1128 lp = rtr->lr_gateway;
1129
1130 if (!lp->lp_alive || /* gateway is down */
1131 ((lp->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0 &&
1132 rtr->lr_downis != 0)) /* NI to target is down */
1133 continue;
1134
1135 if (ni != NULL && lp->lp_ni != ni)
1136 continue;
1137
1138 if (lp->lp_nid == rtr_nid) /* it's pre-determined router */
1139 return lp;
1140
1141 if (lp_best == NULL) {
1142 rtr_best = rtr_last = rtr;
1143 lp_best = lp;
1144 continue;
1145 }
1146
1147 /* no protection on below fields, but it's harmless */
1148 if (rtr_last->lr_seq - rtr->lr_seq < 0)
1149 rtr_last = rtr;
1150
1151 rc = lnet_compare_routes(rtr, rtr_best);
1152 if (rc < 0)
1153 continue;
1154
1155 rtr_best = rtr;
1156 lp_best = lp;
1157 }
1158
1159 /* set sequence number on the best router to the latest sequence + 1
1160 * so we can round-robin all routers, it's race and inaccurate but
1161 * harmless and functional */
1162 if (rtr_best != NULL)
1163 rtr_best->lr_seq = rtr_last->lr_seq + 1;
1164 return lp_best;
1165 }
1166
1167 int
1168 lnet_send(lnet_nid_t src_nid, lnet_msg_t *msg, lnet_nid_t rtr_nid)
1169 {
1170 lnet_nid_t dst_nid = msg->msg_target.nid;
1171 struct lnet_ni *src_ni;
1172 struct lnet_ni *local_ni;
1173 struct lnet_peer *lp;
1174 int cpt;
1175 int cpt2;
1176 int rc;
1177
1178 /* NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
1179 * but we might want to use pre-determined router for ACK/REPLY
1180 * in the future */
1181 /* NB: ni != NULL == interface pre-determined (ACK/REPLY) */
1182 LASSERT(msg->msg_txpeer == NULL);
1183 LASSERT(!msg->msg_sending);
1184 LASSERT(!msg->msg_target_is_router);
1185 LASSERT(!msg->msg_receiving);
1186
1187 msg->msg_sending = 1;
1188
1189 LASSERT(!msg->msg_tx_committed);
1190 cpt = lnet_cpt_of_nid(rtr_nid == LNET_NID_ANY ? dst_nid : rtr_nid);
1191 again:
1192 lnet_net_lock(cpt);
1193
1194 if (the_lnet.ln_shutdown) {
1195 lnet_net_unlock(cpt);
1196 return -ESHUTDOWN;
1197 }
1198
1199 if (src_nid == LNET_NID_ANY) {
1200 src_ni = NULL;
1201 } else {
1202 src_ni = lnet_nid2ni_locked(src_nid, cpt);
1203 if (src_ni == NULL) {
1204 lnet_net_unlock(cpt);
1205 LCONSOLE_WARN("Can't send to %s: src %s is not a "
1206 "local nid\n", libcfs_nid2str(dst_nid),
1207 libcfs_nid2str(src_nid));
1208 return -EINVAL;
1209 }
1210 LASSERT(!msg->msg_routing);
1211 }
1212
1213 /* Is this for someone on a local network? */
1214 local_ni = lnet_net2ni_locked(LNET_NIDNET(dst_nid), cpt);
1215
1216 if (local_ni != NULL) {
1217 if (src_ni == NULL) {
1218 src_ni = local_ni;
1219 src_nid = src_ni->ni_nid;
1220 } else if (src_ni == local_ni) {
1221 lnet_ni_decref_locked(local_ni, cpt);
1222 } else {
1223 lnet_ni_decref_locked(local_ni, cpt);
1224 lnet_ni_decref_locked(src_ni, cpt);
1225 lnet_net_unlock(cpt);
1226 LCONSOLE_WARN("No route to %s via from %s\n",
1227 libcfs_nid2str(dst_nid),
1228 libcfs_nid2str(src_nid));
1229 return -EINVAL;
1230 }
1231
1232 LASSERT(src_nid != LNET_NID_ANY);
1233 lnet_msg_commit(msg, cpt);
1234
1235 if (!msg->msg_routing)
1236 msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
1237
1238 if (src_ni == the_lnet.ln_loni) {
1239 /* No send credit hassles with LOLND */
1240 lnet_net_unlock(cpt);
1241 lnet_ni_send(src_ni, msg);
1242
1243 lnet_net_lock(cpt);
1244 lnet_ni_decref_locked(src_ni, cpt);
1245 lnet_net_unlock(cpt);
1246 return 0;
1247 }
1248
1249 rc = lnet_nid2peer_locked(&lp, dst_nid, cpt);
1250 /* lp has ref on src_ni; lose mine */
1251 lnet_ni_decref_locked(src_ni, cpt);
1252 if (rc != 0) {
1253 lnet_net_unlock(cpt);
1254 LCONSOLE_WARN("Error %d finding peer %s\n", rc,
1255 libcfs_nid2str(dst_nid));
1256 /* ENOMEM or shutting down */
1257 return rc;
1258 }
1259 LASSERT(lp->lp_ni == src_ni);
1260 } else {
1261 /* sending to a remote network */
1262 lp = lnet_find_route_locked(src_ni, dst_nid, rtr_nid);
1263 if (lp == NULL) {
1264 if (src_ni != NULL)
1265 lnet_ni_decref_locked(src_ni, cpt);
1266 lnet_net_unlock(cpt);
1267
1268 LCONSOLE_WARN("No route to %s via %s "
1269 "(all routers down)\n",
1270 libcfs_id2str(msg->msg_target),
1271 libcfs_nid2str(src_nid));
1272 return -EHOSTUNREACH;
1273 }
1274
1275 /* rtr_nid is LNET_NID_ANY or NID of pre-determined router,
1276 * it's possible that rtr_nid isn't LNET_NID_ANY and lp isn't
1277 * pre-determined router, this can happen if router table
1278 * was changed when we release the lock */
1279 if (rtr_nid != lp->lp_nid) {
1280 cpt2 = lnet_cpt_of_nid_locked(lp->lp_nid);
1281 if (cpt2 != cpt) {
1282 if (src_ni != NULL)
1283 lnet_ni_decref_locked(src_ni, cpt);
1284 lnet_net_unlock(cpt);
1285
1286 rtr_nid = lp->lp_nid;
1287 cpt = cpt2;
1288 goto again;
1289 }
1290 }
1291
1292 CDEBUG(D_NET, "Best route to %s via %s for %s %d\n",
1293 libcfs_nid2str(dst_nid), libcfs_nid2str(lp->lp_nid),
1294 lnet_msgtyp2str(msg->msg_type), msg->msg_len);
1295
1296 if (src_ni == NULL) {
1297 src_ni = lp->lp_ni;
1298 src_nid = src_ni->ni_nid;
1299 } else {
1300 LASSERT(src_ni == lp->lp_ni);
1301 lnet_ni_decref_locked(src_ni, cpt);
1302 }
1303
1304 lnet_peer_addref_locked(lp);
1305
1306 LASSERT(src_nid != LNET_NID_ANY);
1307 lnet_msg_commit(msg, cpt);
1308
1309 if (!msg->msg_routing) {
1310 /* I'm the source and now I know which NI to send on */
1311 msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
1312 }
1313
1314 msg->msg_target_is_router = 1;
1315 msg->msg_target.nid = lp->lp_nid;
1316 msg->msg_target.pid = LUSTRE_SRV_LNET_PID;
1317 }
1318
1319 /* 'lp' is our best choice of peer */
1320
1321 LASSERT(!msg->msg_peertxcredit);
1322 LASSERT(!msg->msg_txcredit);
1323 LASSERT(msg->msg_txpeer == NULL);
1324
1325 msg->msg_txpeer = lp; /* msg takes my ref on lp */
1326
1327 rc = lnet_post_send_locked(msg, 0);
1328 lnet_net_unlock(cpt);
1329
1330 if (rc == EHOSTUNREACH)
1331 return -EHOSTUNREACH;
1332
1333 if (rc == 0)
1334 lnet_ni_send(src_ni, msg);
1335
1336 return 0;
1337 }
1338
1339 static void
1340 lnet_drop_message(lnet_ni_t *ni, int cpt, void *private, unsigned int nob)
1341 {
1342 lnet_net_lock(cpt);
1343 the_lnet.ln_counters[cpt]->drop_count++;
1344 the_lnet.ln_counters[cpt]->drop_length += nob;
1345 lnet_net_unlock(cpt);
1346
1347 lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
1348 }
1349
1350 static void
1351 lnet_recv_put(lnet_ni_t *ni, lnet_msg_t *msg)
1352 {
1353 lnet_hdr_t *hdr = &msg->msg_hdr;
1354
1355 if (msg->msg_wanted != 0)
1356 lnet_setpayloadbuffer(msg);
1357
1358 lnet_build_msg_event(msg, LNET_EVENT_PUT);
1359
1360 /* Must I ACK? If so I'll grab the ack_wmd out of the header and put
1361 * it back into the ACK during lnet_finalize() */
1362 msg->msg_ack = (!lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) &&
1363 (msg->msg_md->md_options & LNET_MD_ACK_DISABLE) == 0);
1364
1365 lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed,
1366 msg->msg_offset, msg->msg_wanted, hdr->payload_length);
1367 }
1368
1369 static int
1370 lnet_parse_put(lnet_ni_t *ni, lnet_msg_t *msg)
1371 {
1372 lnet_hdr_t *hdr = &msg->msg_hdr;
1373 struct lnet_match_info info;
1374 int rc;
1375
1376 /* Convert put fields to host byte order */
1377 hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits);
1378 hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index);
1379 hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset);
1380
1381 info.mi_id.nid = hdr->src_nid;
1382 info.mi_id.pid = hdr->src_pid;
1383 info.mi_opc = LNET_MD_OP_PUT;
1384 info.mi_portal = hdr->msg.put.ptl_index;
1385 info.mi_rlength = hdr->payload_length;
1386 info.mi_roffset = hdr->msg.put.offset;
1387 info.mi_mbits = hdr->msg.put.match_bits;
1388
1389 msg->msg_rx_ready_delay = ni->ni_lnd->lnd_eager_recv == NULL;
1390
1391 again:
1392 rc = lnet_ptl_match_md(&info, msg);
1393 switch (rc) {
1394 default:
1395 LBUG();
1396
1397 case LNET_MATCHMD_OK:
1398 lnet_recv_put(ni, msg);
1399 return 0;
1400
1401 case LNET_MATCHMD_NONE:
1402 if (msg->msg_rx_delayed) /* attached on delayed list */
1403 return 0;
1404
1405 rc = lnet_ni_eager_recv(ni, msg);
1406 if (rc == 0)
1407 goto again;
1408 /* fall through */
1409
1410 case LNET_MATCHMD_DROP:
1411 CNETERR("Dropping PUT from %s portal %d match "LPU64
1412 " offset %d length %d: %d\n",
1413 libcfs_id2str(info.mi_id), info.mi_portal,
1414 info.mi_mbits, info.mi_roffset, info.mi_rlength, rc);
1415
1416 return ENOENT; /* +ve: OK but no match */
1417 }
1418 }
1419
1420 static int
1421 lnet_parse_get(lnet_ni_t *ni, lnet_msg_t *msg, int rdma_get)
1422 {
1423 struct lnet_match_info info;
1424 lnet_hdr_t *hdr = &msg->msg_hdr;
1425 lnet_handle_wire_t reply_wmd;
1426 int rc;
1427
1428 /* Convert get fields to host byte order */
1429 hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits);
1430 hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index);
1431 hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length);
1432 hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset);
1433
1434 info.mi_id.nid = hdr->src_nid;
1435 info.mi_id.pid = hdr->src_pid;
1436 info.mi_opc = LNET_MD_OP_GET;
1437 info.mi_portal = hdr->msg.get.ptl_index;
1438 info.mi_rlength = hdr->msg.get.sink_length;
1439 info.mi_roffset = hdr->msg.get.src_offset;
1440 info.mi_mbits = hdr->msg.get.match_bits;
1441
1442 rc = lnet_ptl_match_md(&info, msg);
1443 if (rc == LNET_MATCHMD_DROP) {
1444 CNETERR("Dropping GET from %s portal %d match "LPU64
1445 " offset %d length %d\n",
1446 libcfs_id2str(info.mi_id), info.mi_portal,
1447 info.mi_mbits, info.mi_roffset, info.mi_rlength);
1448 return ENOENT; /* +ve: OK but no match */
1449 }
1450
1451 LASSERT(rc == LNET_MATCHMD_OK);
1452
1453 lnet_build_msg_event(msg, LNET_EVENT_GET);
1454
1455 reply_wmd = hdr->msg.get.return_wmd;
1456
1457 lnet_prep_send(msg, LNET_MSG_REPLY, info.mi_id,
1458 msg->msg_offset, msg->msg_wanted);
1459
1460 msg->msg_hdr.msg.reply.dst_wmd = reply_wmd;
1461
1462 if (rdma_get) {
1463 /* The LND completes the REPLY from her recv procedure */
1464 lnet_ni_recv(ni, msg->msg_private, msg, 0,
1465 msg->msg_offset, msg->msg_len, msg->msg_len);
1466 return 0;
1467 }
1468
1469 lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0);
1470 msg->msg_receiving = 0;
1471
1472 rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY);
1473 if (rc < 0) {
1474 /* didn't get as far as lnet_ni_send() */
1475 CERROR("%s: Unable to send REPLY for GET from %s: %d\n",
1476 libcfs_nid2str(ni->ni_nid),
1477 libcfs_id2str(info.mi_id), rc);
1478
1479 lnet_finalize(ni, msg, rc);
1480 }
1481
1482 return 0;
1483 }
1484
1485 static int
1486 lnet_parse_reply(lnet_ni_t *ni, lnet_msg_t *msg)
1487 {
1488 void *private = msg->msg_private;
1489 lnet_hdr_t *hdr = &msg->msg_hdr;
1490 lnet_process_id_t src = {0};
1491 lnet_libmd_t *md;
1492 int rlength;
1493 int mlength;
1494 int cpt;
1495
1496 cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
1497 lnet_res_lock(cpt);
1498
1499 src.nid = hdr->src_nid;
1500 src.pid = hdr->src_pid;
1501
1502 /* NB handles only looked up by creator (no flips) */
1503 md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd);
1504 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
1505 CNETERR("%s: Dropping REPLY from %s for %s "
1506 "MD "LPX64"."LPX64"\n",
1507 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1508 (md == NULL) ? "invalid" : "inactive",
1509 hdr->msg.reply.dst_wmd.wh_interface_cookie,
1510 hdr->msg.reply.dst_wmd.wh_object_cookie);
1511 if (md != NULL && md->md_me != NULL)
1512 CERROR("REPLY MD also attached to portal %d\n",
1513 md->md_me->me_portal);
1514
1515 lnet_res_unlock(cpt);
1516 return ENOENT; /* +ve: OK but no match */
1517 }
1518
1519 LASSERT(md->md_offset == 0);
1520
1521 rlength = hdr->payload_length;
1522 mlength = MIN(rlength, (int)md->md_length);
1523
1524 if (mlength < rlength &&
1525 (md->md_options & LNET_MD_TRUNCATE) == 0) {
1526 CNETERR("%s: Dropping REPLY from %s length %d "
1527 "for MD "LPX64" would overflow (%d)\n",
1528 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1529 rlength, hdr->msg.reply.dst_wmd.wh_object_cookie,
1530 mlength);
1531 lnet_res_unlock(cpt);
1532 return ENOENT; /* +ve: OK but no match */
1533 }
1534
1535 CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md "LPX64"\n",
1536 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1537 mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie);
1538
1539 lnet_msg_attach_md(msg, md, 0, mlength);
1540
1541 if (mlength != 0)
1542 lnet_setpayloadbuffer(msg);
1543
1544 lnet_res_unlock(cpt);
1545
1546 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
1547
1548 lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength);
1549 return 0;
1550 }
1551
1552 static int
1553 lnet_parse_ack(lnet_ni_t *ni, lnet_msg_t *msg)
1554 {
1555 lnet_hdr_t *hdr = &msg->msg_hdr;
1556 lnet_process_id_t src = {0};
1557 lnet_libmd_t *md;
1558 int cpt;
1559
1560 src.nid = hdr->src_nid;
1561 src.pid = hdr->src_pid;
1562
1563 /* Convert ack fields to host byte order */
1564 hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits);
1565 hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength);
1566
1567 cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie);
1568 lnet_res_lock(cpt);
1569
1570 /* NB handles only looked up by creator (no flips) */
1571 md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd);
1572 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
1573 /* Don't moan; this is expected */
1574 CDEBUG(D_NET,
1575 "%s: Dropping ACK from %s to %s MD "LPX64"."LPX64"\n",
1576 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1577 (md == NULL) ? "invalid" : "inactive",
1578 hdr->msg.ack.dst_wmd.wh_interface_cookie,
1579 hdr->msg.ack.dst_wmd.wh_object_cookie);
1580 if (md != NULL && md->md_me != NULL)
1581 CERROR("Source MD also attached to portal %d\n",
1582 md->md_me->me_portal);
1583
1584 lnet_res_unlock(cpt);
1585 return ENOENT; /* +ve! */
1586 }
1587
1588 CDEBUG(D_NET, "%s: ACK from %s into md "LPX64"\n",
1589 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1590 hdr->msg.ack.dst_wmd.wh_object_cookie);
1591
1592 lnet_msg_attach_md(msg, md, 0, 0);
1593
1594 lnet_res_unlock(cpt);
1595
1596 lnet_build_msg_event(msg, LNET_EVENT_ACK);
1597
1598 lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len);
1599 return 0;
1600 }
1601
1602 static int
1603 lnet_parse_forward_locked(lnet_ni_t *ni, lnet_msg_t *msg)
1604 {
1605 int rc = 0;
1606
1607 if (msg->msg_rxpeer->lp_rtrcredits <= 0 ||
1608 lnet_msg2bufpool(msg)->rbp_credits <= 0) {
1609 if (ni->ni_lnd->lnd_eager_recv == NULL) {
1610 msg->msg_rx_ready_delay = 1;
1611 } else {
1612 lnet_net_unlock(msg->msg_rx_cpt);
1613 rc = lnet_ni_eager_recv(ni, msg);
1614 lnet_net_lock(msg->msg_rx_cpt);
1615 }
1616 }
1617
1618 if (rc == 0)
1619 rc = lnet_post_routed_recv_locked(msg, 0);
1620 return rc;
1621 }
1622
1623 char *
1624 lnet_msgtyp2str(int type)
1625 {
1626 switch (type) {
1627 case LNET_MSG_ACK:
1628 return "ACK";
1629 case LNET_MSG_PUT:
1630 return "PUT";
1631 case LNET_MSG_GET:
1632 return "GET";
1633 case LNET_MSG_REPLY:
1634 return "REPLY";
1635 case LNET_MSG_HELLO:
1636 return "HELLO";
1637 default:
1638 return "<UNKNOWN>";
1639 }
1640 }
1641 EXPORT_SYMBOL(lnet_msgtyp2str);
1642
1643 void
1644 lnet_print_hdr(lnet_hdr_t *hdr)
1645 {
1646 lnet_process_id_t src = {0};
1647 lnet_process_id_t dst = {0};
1648 char *type_str = lnet_msgtyp2str(hdr->type);
1649
1650 src.nid = hdr->src_nid;
1651 src.pid = hdr->src_pid;
1652
1653 dst.nid = hdr->dest_nid;
1654 dst.pid = hdr->dest_pid;
1655
1656 CWARN("P3 Header at %p of type %s\n", hdr, type_str);
1657 CWARN(" From %s\n", libcfs_id2str(src));
1658 CWARN(" To %s\n", libcfs_id2str(dst));
1659
1660 switch (hdr->type) {
1661 default:
1662 break;
1663
1664 case LNET_MSG_PUT:
1665 CWARN(" Ptl index %d, ack md "LPX64"."LPX64", "
1666 "match bits "LPU64"\n",
1667 hdr->msg.put.ptl_index,
1668 hdr->msg.put.ack_wmd.wh_interface_cookie,
1669 hdr->msg.put.ack_wmd.wh_object_cookie,
1670 hdr->msg.put.match_bits);
1671 CWARN(" Length %d, offset %d, hdr data "LPX64"\n",
1672 hdr->payload_length, hdr->msg.put.offset,
1673 hdr->msg.put.hdr_data);
1674 break;
1675
1676 case LNET_MSG_GET:
1677 CWARN(" Ptl index %d, return md "LPX64"."LPX64", "
1678 "match bits "LPU64"\n", hdr->msg.get.ptl_index,
1679 hdr->msg.get.return_wmd.wh_interface_cookie,
1680 hdr->msg.get.return_wmd.wh_object_cookie,
1681 hdr->msg.get.match_bits);
1682 CWARN(" Length %d, src offset %d\n",
1683 hdr->msg.get.sink_length,
1684 hdr->msg.get.src_offset);
1685 break;
1686
1687 case LNET_MSG_ACK:
1688 CWARN(" dst md "LPX64"."LPX64", "
1689 "manipulated length %d\n",
1690 hdr->msg.ack.dst_wmd.wh_interface_cookie,
1691 hdr->msg.ack.dst_wmd.wh_object_cookie,
1692 hdr->msg.ack.mlength);
1693 break;
1694
1695 case LNET_MSG_REPLY:
1696 CWARN(" dst md "LPX64"."LPX64", "
1697 "length %d\n",
1698 hdr->msg.reply.dst_wmd.wh_interface_cookie,
1699 hdr->msg.reply.dst_wmd.wh_object_cookie,
1700 hdr->payload_length);
1701 }
1702
1703 }
1704
1705 int
1706 lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid,
1707 void *private, int rdma_req)
1708 {
1709 int rc = 0;
1710 int cpt;
1711 int for_me;
1712 struct lnet_msg *msg;
1713 lnet_pid_t dest_pid;
1714 lnet_nid_t dest_nid;
1715 lnet_nid_t src_nid;
1716 __u32 payload_length;
1717 __u32 type;
1718
1719 LASSERT(!in_interrupt());
1720
1721 type = le32_to_cpu(hdr->type);
1722 src_nid = le64_to_cpu(hdr->src_nid);
1723 dest_nid = le64_to_cpu(hdr->dest_nid);
1724 dest_pid = le32_to_cpu(hdr->dest_pid);
1725 payload_length = le32_to_cpu(hdr->payload_length);
1726
1727 for_me = (ni->ni_nid == dest_nid);
1728 cpt = lnet_cpt_of_nid(from_nid);
1729
1730 switch (type) {
1731 case LNET_MSG_ACK:
1732 case LNET_MSG_GET:
1733 if (payload_length > 0) {
1734 CERROR("%s, src %s: bad %s payload %d (0 expected)\n",
1735 libcfs_nid2str(from_nid),
1736 libcfs_nid2str(src_nid),
1737 lnet_msgtyp2str(type), payload_length);
1738 return -EPROTO;
1739 }
1740 break;
1741
1742 case LNET_MSG_PUT:
1743 case LNET_MSG_REPLY:
1744 if (payload_length >
1745 (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) {
1746 CERROR("%s, src %s: bad %s payload %d "
1747 "(%d max expected)\n",
1748 libcfs_nid2str(from_nid),
1749 libcfs_nid2str(src_nid),
1750 lnet_msgtyp2str(type),
1751 payload_length,
1752 for_me ? LNET_MAX_PAYLOAD : LNET_MTU);
1753 return -EPROTO;
1754 }
1755 break;
1756
1757 default:
1758 CERROR("%s, src %s: Bad message type 0x%x\n",
1759 libcfs_nid2str(from_nid),
1760 libcfs_nid2str(src_nid), type);
1761 return -EPROTO;
1762 }
1763
1764 if (the_lnet.ln_routing &&
1765 ni->ni_last_alive != cfs_time_current_sec()) {
1766 lnet_ni_lock(ni);
1767
1768 /* NB: so far here is the only place to set NI status to "up */
1769 ni->ni_last_alive = cfs_time_current_sec();
1770 if (ni->ni_status != NULL &&
1771 ni->ni_status->ns_status == LNET_NI_STATUS_DOWN)
1772 ni->ni_status->ns_status = LNET_NI_STATUS_UP;
1773 lnet_ni_unlock(ni);
1774 }
1775
1776 /* Regard a bad destination NID as a protocol error. Senders should
1777 * know what they're doing; if they don't they're misconfigured, buggy
1778 * or malicious so we chop them off at the knees :) */
1779
1780 if (!for_me) {
1781 if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) {
1782 /* should have gone direct */
1783 CERROR("%s, src %s: Bad dest nid %s "
1784 "(should have been sent direct)\n",
1785 libcfs_nid2str(from_nid),
1786 libcfs_nid2str(src_nid),
1787 libcfs_nid2str(dest_nid));
1788 return -EPROTO;
1789 }
1790
1791 if (lnet_islocalnid(dest_nid)) {
1792 /* dest is another local NI; sender should have used
1793 * this node's NID on its own network */
1794 CERROR("%s, src %s: Bad dest nid %s "
1795 "(it's my nid but on a different network)\n",
1796 libcfs_nid2str(from_nid),
1797 libcfs_nid2str(src_nid),
1798 libcfs_nid2str(dest_nid));
1799 return -EPROTO;
1800 }
1801
1802 if (rdma_req && type == LNET_MSG_GET) {
1803 CERROR("%s, src %s: Bad optimized GET for %s "
1804 "(final destination must be me)\n",
1805 libcfs_nid2str(from_nid),
1806 libcfs_nid2str(src_nid),
1807 libcfs_nid2str(dest_nid));
1808 return -EPROTO;
1809 }
1810
1811 if (!the_lnet.ln_routing) {
1812 CERROR("%s, src %s: Dropping message for %s "
1813 "(routing not enabled)\n",
1814 libcfs_nid2str(from_nid),
1815 libcfs_nid2str(src_nid),
1816 libcfs_nid2str(dest_nid));
1817 goto drop;
1818 }
1819 }
1820
1821 /* Message looks OK; we're not going to return an error, so we MUST
1822 * call back lnd_recv() come what may... */
1823
1824 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
1825 fail_peer(src_nid, 0)) { /* shall we now? */
1826 CERROR("%s, src %s: Dropping %s to simulate failure\n",
1827 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1828 lnet_msgtyp2str(type));
1829 goto drop;
1830 }
1831
1832 msg = lnet_msg_alloc();
1833 if (msg == NULL) {
1834 CERROR("%s, src %s: Dropping %s (out of memory)\n",
1835 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1836 lnet_msgtyp2str(type));
1837 goto drop;
1838 }
1839
1840 /* msg zeroed in lnet_msg_alloc;
1841 * i.e. flags all clear, pointers NULL etc
1842 */
1843
1844 msg->msg_type = type;
1845 msg->msg_private = private;
1846 msg->msg_receiving = 1;
1847 msg->msg_len = msg->msg_wanted = payload_length;
1848 msg->msg_offset = 0;
1849 msg->msg_hdr = *hdr;
1850 /* for building message event */
1851 msg->msg_from = from_nid;
1852 if (!for_me) {
1853 msg->msg_target.pid = dest_pid;
1854 msg->msg_target.nid = dest_nid;
1855 msg->msg_routing = 1;
1856
1857 } else {
1858 /* convert common msg->hdr fields to host byteorder */
1859 msg->msg_hdr.type = type;
1860 msg->msg_hdr.src_nid = src_nid;
1861 msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid);
1862 msg->msg_hdr.dest_nid = dest_nid;
1863 msg->msg_hdr.dest_pid = dest_pid;
1864 msg->msg_hdr.payload_length = payload_length;
1865 }
1866
1867 lnet_net_lock(cpt);
1868 rc = lnet_nid2peer_locked(&msg->msg_rxpeer, from_nid, cpt);
1869 if (rc != 0) {
1870 lnet_net_unlock(cpt);
1871 CERROR("%s, src %s: Dropping %s "
1872 "(error %d looking up sender)\n",
1873 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1874 lnet_msgtyp2str(type), rc);
1875 lnet_msg_free(msg);
1876 goto drop;
1877 }
1878
1879 lnet_msg_commit(msg, cpt);
1880
1881 if (!for_me) {
1882 rc = lnet_parse_forward_locked(ni, msg);
1883 lnet_net_unlock(cpt);
1884
1885 if (rc < 0)
1886 goto free_drop;
1887 if (rc == 0) {
1888 lnet_ni_recv(ni, msg->msg_private, msg, 0,
1889 0, payload_length, payload_length);
1890 }
1891 return 0;
1892 }
1893
1894 lnet_net_unlock(cpt);
1895
1896 switch (type) {
1897 case LNET_MSG_ACK:
1898 rc = lnet_parse_ack(ni, msg);
1899 break;
1900 case LNET_MSG_PUT:
1901 rc = lnet_parse_put(ni, msg);
1902 break;
1903 case LNET_MSG_GET:
1904 rc = lnet_parse_get(ni, msg, rdma_req);
1905 break;
1906 case LNET_MSG_REPLY:
1907 rc = lnet_parse_reply(ni, msg);
1908 break;
1909 default:
1910 LASSERT(0);
1911 rc = -EPROTO;
1912 goto free_drop; /* prevent an unused label if !kernel */
1913 }
1914
1915 if (rc == 0)
1916 return 0;
1917
1918 LASSERT(rc == ENOENT);
1919
1920 free_drop:
1921 LASSERT(msg->msg_md == NULL);
1922 lnet_finalize(ni, msg, rc);
1923
1924 drop:
1925 lnet_drop_message(ni, cpt, private, payload_length);
1926 return 0;
1927 }
1928 EXPORT_SYMBOL(lnet_parse);
1929
1930 void
1931 lnet_drop_delayed_msg_list(struct list_head *head, char *reason)
1932 {
1933 while (!list_empty(head)) {
1934 lnet_process_id_t id = {0};
1935 lnet_msg_t *msg;
1936
1937 msg = list_entry(head->next, lnet_msg_t, msg_list);
1938 list_del(&msg->msg_list);
1939
1940 id.nid = msg->msg_hdr.src_nid;
1941 id.pid = msg->msg_hdr.src_pid;
1942
1943 LASSERT(msg->msg_md == NULL);
1944 LASSERT(msg->msg_rx_delayed);
1945 LASSERT(msg->msg_rxpeer != NULL);
1946 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
1947
1948 CWARN("Dropping delayed PUT from %s portal %d match "LPU64
1949 " offset %d length %d: %s\n",
1950 libcfs_id2str(id),
1951 msg->msg_hdr.msg.put.ptl_index,
1952 msg->msg_hdr.msg.put.match_bits,
1953 msg->msg_hdr.msg.put.offset,
1954 msg->msg_hdr.payload_length, reason);
1955
1956 /* NB I can't drop msg's ref on msg_rxpeer until after I've
1957 * called lnet_drop_message(), so I just hang onto msg as well
1958 * until that's done */
1959
1960 lnet_drop_message(msg->msg_rxpeer->lp_ni,
1961 msg->msg_rxpeer->lp_cpt,
1962 msg->msg_private, msg->msg_len);
1963 /*
1964 * NB: message will not generate event because w/o attached MD,
1965 * but we still should give error code so lnet_msg_decommit()
1966 * can skip counters operations and other checks.
1967 */
1968 lnet_finalize(msg->msg_rxpeer->lp_ni, msg, -ENOENT);
1969 }
1970 }
1971
1972 void
1973 lnet_recv_delayed_msg_list(struct list_head *head)
1974 {
1975 while (!list_empty(head)) {
1976 lnet_msg_t *msg;
1977 lnet_process_id_t id;
1978
1979 msg = list_entry(head->next, lnet_msg_t, msg_list);
1980 list_del(&msg->msg_list);
1981
1982 /* md won't disappear under me, since each msg
1983 * holds a ref on it */
1984
1985 id.nid = msg->msg_hdr.src_nid;
1986 id.pid = msg->msg_hdr.src_pid;
1987
1988 LASSERT(msg->msg_rx_delayed);
1989 LASSERT(msg->msg_md != NULL);
1990 LASSERT(msg->msg_rxpeer != NULL);
1991 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
1992
1993 CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d "
1994 "match "LPU64" offset %d length %d.\n",
1995 libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index,
1996 msg->msg_hdr.msg.put.match_bits,
1997 msg->msg_hdr.msg.put.offset,
1998 msg->msg_hdr.payload_length);
1999
2000 lnet_recv_put(msg->msg_rxpeer->lp_ni, msg);
2001 }
2002 }
2003
2004 /**
2005 * Initiate an asynchronous PUT operation.
2006 *
2007 * There are several events associated with a PUT: completion of the send on
2008 * the initiator node (LNET_EVENT_SEND), and when the send completes
2009 * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating
2010 * that the operation was accepted by the target. The event LNET_EVENT_PUT is
2011 * used at the target node to indicate the completion of incoming data
2012 * delivery.
2013 *
2014 * The local events will be logged in the EQ associated with the MD pointed to
2015 * by \a mdh handle. Using a MD without an associated EQ results in these
2016 * events being discarded. In this case, the caller must have another
2017 * mechanism (e.g., a higher level protocol) for determining when it is safe
2018 * to modify the memory region associated with the MD.
2019 *
2020 * Note that LNet does not guarantee the order of LNET_EVENT_SEND and
2021 * LNET_EVENT_ACK, though intuitively ACK should happen after SEND.
2022 *
2023 * \param self Indicates the NID of a local interface through which to send
2024 * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself.
2025 * \param mdh A handle for the MD that describes the memory to be sent. The MD
2026 * must be "free floating" (See LNetMDBind()).
2027 * \param ack Controls whether an acknowledgment is requested.
2028 * Acknowledgments are only sent when they are requested by the initiating
2029 * process and the target MD enables them.
2030 * \param target A process identifier for the target process.
2031 * \param portal The index in the \a target's portal table.
2032 * \param match_bits The match bits to use for MD selection at the target
2033 * process.
2034 * \param offset The offset into the target MD (only used when the target
2035 * MD has the LNET_MD_MANAGE_REMOTE option set).
2036 * \param hdr_data 64 bits of user data that can be included in the message
2037 * header. This data is written to an event queue entry at the target if an
2038 * EQ is present on the matching MD.
2039 *
2040 * \retval 0 Success, and only in this case events will be generated
2041 * and logged to EQ (if it exists).
2042 * \retval -EIO Simulated failure.
2043 * \retval -ENOMEM Memory allocation failure.
2044 * \retval -ENOENT Invalid MD object.
2045 *
2046 * \see lnet_event_t::hdr_data and lnet_event_kind_t.
2047 */
2048 int
2049 LNetPut(lnet_nid_t self, lnet_handle_md_t mdh, lnet_ack_req_t ack,
2050 lnet_process_id_t target, unsigned int portal,
2051 __u64 match_bits, unsigned int offset,
2052 __u64 hdr_data)
2053 {
2054 struct lnet_msg *msg;
2055 struct lnet_libmd *md;
2056 int cpt;
2057 int rc;
2058
2059 LASSERT(the_lnet.ln_init);
2060 LASSERT(the_lnet.ln_refcount > 0);
2061
2062 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
2063 fail_peer(target.nid, 1)) { /* shall we now? */
2064 CERROR("Dropping PUT to %s: simulated failure\n",
2065 libcfs_id2str(target));
2066 return -EIO;
2067 }
2068
2069 msg = lnet_msg_alloc();
2070 if (msg == NULL) {
2071 CERROR("Dropping PUT to %s: ENOMEM on lnet_msg_t\n",
2072 libcfs_id2str(target));
2073 return -ENOMEM;
2074 }
2075 msg->msg_vmflush = !!memory_pressure_get();
2076
2077 cpt = lnet_cpt_of_cookie(mdh.cookie);
2078 lnet_res_lock(cpt);
2079
2080 md = lnet_handle2md(&mdh);
2081 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2082 CERROR("Dropping PUT ("LPU64":%d:%s): MD (%d) invalid\n",
2083 match_bits, portal, libcfs_id2str(target),
2084 md == NULL ? -1 : md->md_threshold);
2085 if (md != NULL && md->md_me != NULL)
2086 CERROR("Source MD also attached to portal %d\n",
2087 md->md_me->me_portal);
2088 lnet_res_unlock(cpt);
2089
2090 lnet_msg_free(msg);
2091 return -ENOENT;
2092 }
2093
2094 CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target));
2095
2096 lnet_msg_attach_md(msg, md, 0, 0);
2097
2098 lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length);
2099
2100 msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits);
2101 msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal);
2102 msg->msg_hdr.msg.put.offset = cpu_to_le32(offset);
2103 msg->msg_hdr.msg.put.hdr_data = hdr_data;
2104
2105 /* NB handles only looked up by creator (no flips) */
2106 if (ack == LNET_ACK_REQ) {
2107 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2108 the_lnet.ln_interface_cookie;
2109 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2110 md->md_lh.lh_cookie;
2111 } else {
2112 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2113 LNET_WIRE_HANDLE_COOKIE_NONE;
2114 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2115 LNET_WIRE_HANDLE_COOKIE_NONE;
2116 }
2117
2118 lnet_res_unlock(cpt);
2119
2120 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2121
2122 rc = lnet_send(self, msg, LNET_NID_ANY);
2123 if (rc != 0) {
2124 CNETERR("Error sending PUT to %s: %d\n",
2125 libcfs_id2str(target), rc);
2126 lnet_finalize(NULL, msg, rc);
2127 }
2128
2129 /* completion will be signalled by an event */
2130 return 0;
2131 }
2132 EXPORT_SYMBOL(LNetPut);
2133
2134 lnet_msg_t *
2135 lnet_create_reply_msg(lnet_ni_t *ni, lnet_msg_t *getmsg)
2136 {
2137 /* The LND can DMA direct to the GET md (i.e. no REPLY msg). This
2138 * returns a msg for the LND to pass to lnet_finalize() when the sink
2139 * data has been received.
2140 *
2141 * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when
2142 * lnet_finalize() is called on it, so the LND must call this first */
2143
2144 struct lnet_msg *msg = lnet_msg_alloc();
2145 struct lnet_libmd *getmd = getmsg->msg_md;
2146 lnet_process_id_t peer_id = getmsg->msg_target;
2147 int cpt;
2148
2149 LASSERT(!getmsg->msg_target_is_router);
2150 LASSERT(!getmsg->msg_routing);
2151
2152 cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
2153 lnet_res_lock(cpt);
2154
2155 LASSERT(getmd->md_refcount > 0);
2156
2157 if (msg == NULL) {
2158 CERROR("%s: Dropping REPLY from %s: can't allocate msg\n",
2159 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
2160 goto drop;
2161 }
2162
2163 if (getmd->md_threshold == 0) {
2164 CERROR("%s: Dropping REPLY from %s for inactive MD %p\n",
2165 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),
2166 getmd);
2167 lnet_res_unlock(cpt);
2168 goto drop;
2169 }
2170
2171 LASSERT(getmd->md_offset == 0);
2172
2173 CDEBUG(D_NET, "%s: Reply from %s md %p\n",
2174 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
2175
2176 /* setup information for lnet_build_msg_event */
2177 msg->msg_from = peer_id.nid;
2178 msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
2179 msg->msg_hdr.src_nid = peer_id.nid;
2180 msg->msg_hdr.payload_length = getmd->md_length;
2181 msg->msg_receiving = 1; /* required by lnet_msg_attach_md */
2182
2183 lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length);
2184 lnet_res_unlock(cpt);
2185
2186 cpt = lnet_cpt_of_nid(peer_id.nid);
2187
2188 lnet_net_lock(cpt);
2189 lnet_msg_commit(msg, cpt);
2190 lnet_net_unlock(cpt);
2191
2192 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
2193
2194 return msg;
2195
2196 drop:
2197 cpt = lnet_cpt_of_nid(peer_id.nid);
2198
2199 lnet_net_lock(cpt);
2200 the_lnet.ln_counters[cpt]->drop_count++;
2201 the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
2202 lnet_net_unlock(cpt);
2203
2204 if (msg != NULL)
2205 lnet_msg_free(msg);
2206
2207 return NULL;
2208 }
2209 EXPORT_SYMBOL(lnet_create_reply_msg);
2210
2211 void
2212 lnet_set_reply_msg_len(lnet_ni_t *ni, lnet_msg_t *reply, unsigned int len)
2213 {
2214 /* Set the REPLY length, now the RDMA that elides the REPLY message has
2215 * completed and I know it. */
2216 LASSERT(reply != NULL);
2217 LASSERT(reply->msg_type == LNET_MSG_GET);
2218 LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY);
2219
2220 /* NB I trusted my peer to RDMA. If she tells me she's written beyond
2221 * the end of my buffer, I might as well be dead. */
2222 LASSERT(len <= reply->msg_ev.mlength);
2223
2224 reply->msg_ev.mlength = len;
2225 }
2226 EXPORT_SYMBOL(lnet_set_reply_msg_len);
2227
2228 /**
2229 * Initiate an asynchronous GET operation.
2230 *
2231 * On the initiator node, an LNET_EVENT_SEND is logged when the GET request
2232 * is sent, and an LNET_EVENT_REPLY is logged when the data returned from
2233 * the target node in the REPLY has been written to local MD.
2234 *
2235 * On the target node, an LNET_EVENT_GET is logged when the GET request
2236 * arrives and is accepted into a MD.
2237 *
2238 * \param self,target,portal,match_bits,offset See the discussion in LNetPut().
2239 * \param mdh A handle for the MD that describes the memory into which the
2240 * requested data will be received. The MD must be "free floating"
2241 * (See LNetMDBind()).
2242 *
2243 * \retval 0 Success, and only in this case events will be generated
2244 * and logged to EQ (if it exists) of the MD.
2245 * \retval -EIO Simulated failure.
2246 * \retval -ENOMEM Memory allocation failure.
2247 * \retval -ENOENT Invalid MD object.
2248 */
2249 int
2250 LNetGet(lnet_nid_t self, lnet_handle_md_t mdh,
2251 lnet_process_id_t target, unsigned int portal,
2252 __u64 match_bits, unsigned int offset)
2253 {
2254 struct lnet_msg *msg;
2255 struct lnet_libmd *md;
2256 int cpt;
2257 int rc;
2258
2259 LASSERT(the_lnet.ln_init);
2260 LASSERT(the_lnet.ln_refcount > 0);
2261
2262 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
2263 fail_peer(target.nid, 1)) { /* shall we now? */
2264 CERROR("Dropping GET to %s: simulated failure\n",
2265 libcfs_id2str(target));
2266 return -EIO;
2267 }
2268
2269 msg = lnet_msg_alloc();
2270 if (msg == NULL) {
2271 CERROR("Dropping GET to %s: ENOMEM on lnet_msg_t\n",
2272 libcfs_id2str(target));
2273 return -ENOMEM;
2274 }
2275
2276 cpt = lnet_cpt_of_cookie(mdh.cookie);
2277 lnet_res_lock(cpt);
2278
2279 md = lnet_handle2md(&mdh);
2280 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2281 CERROR("Dropping GET ("LPU64":%d:%s): MD (%d) invalid\n",
2282 match_bits, portal, libcfs_id2str(target),
2283 md == NULL ? -1 : md->md_threshold);
2284 if (md != NULL && md->md_me != NULL)
2285 CERROR("REPLY MD also attached to portal %d\n",
2286 md->md_me->me_portal);
2287
2288 lnet_res_unlock(cpt);
2289
2290 lnet_msg_free(msg);
2291
2292 return -ENOENT;
2293 }
2294
2295 CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target));
2296
2297 lnet_msg_attach_md(msg, md, 0, 0);
2298
2299 lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0);
2300
2301 msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits);
2302 msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal);
2303 msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset);
2304 msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length);
2305
2306 /* NB handles only looked up by creator (no flips) */
2307 msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie =
2308 the_lnet.ln_interface_cookie;
2309 msg->msg_hdr.msg.get.return_wmd.wh_object_cookie =
2310 md->md_lh.lh_cookie;
2311
2312 lnet_res_unlock(cpt);
2313
2314 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2315
2316 rc = lnet_send(self, msg, LNET_NID_ANY);
2317 if (rc < 0) {
2318 CNETERR("Error sending GET to %s: %d\n",
2319 libcfs_id2str(target), rc);
2320 lnet_finalize(NULL, msg, rc);
2321 }
2322
2323 /* completion will be signalled by an event */
2324 return 0;
2325 }
2326 EXPORT_SYMBOL(LNetGet);
2327
2328 /**
2329 * Calculate distance to node at \a dstnid.
2330 *
2331 * \param dstnid Target NID.
2332 * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid
2333 * is saved here.
2334 * \param orderp If not NULL, order of the route to reach \a dstnid is saved
2335 * here.
2336 *
2337 * \retval 0 If \a dstnid belongs to a local interface, and reserved option
2338 * local_nid_dist_zero is set, which is the default.
2339 * \retval positives Distance to target NID, i.e. number of hops plus one.
2340 * \retval -EHOSTUNREACH If \a dstnid is not reachable.
2341 */
2342 int
2343 LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp)
2344 {
2345 struct list_head *e;
2346 struct lnet_ni *ni;
2347 lnet_remotenet_t *rnet;
2348 __u32 dstnet = LNET_NIDNET(dstnid);
2349 int hops;
2350 int cpt;
2351 __u32 order = 2;
2352 struct list_head *rn_list;
2353
2354 /* if !local_nid_dist_zero, I don't return a distance of 0 ever
2355 * (when lustre sees a distance of 0, it substitutes 0@lo), so I
2356 * keep order 0 free for 0@lo and order 1 free for a local NID
2357 * match */
2358
2359 LASSERT(the_lnet.ln_init);
2360 LASSERT(the_lnet.ln_refcount > 0);
2361
2362 cpt = lnet_net_lock_current();
2363
2364 list_for_each(e, &the_lnet.ln_nis) {
2365 ni = list_entry(e, lnet_ni_t, ni_list);
2366
2367 if (ni->ni_nid == dstnid) {
2368 if (srcnidp != NULL)
2369 *srcnidp = dstnid;
2370 if (orderp != NULL) {
2371 if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND)
2372 *orderp = 0;
2373 else
2374 *orderp = 1;
2375 }
2376 lnet_net_unlock(cpt);
2377
2378 return local_nid_dist_zero ? 0 : 1;
2379 }
2380
2381 if (LNET_NIDNET(ni->ni_nid) == dstnet) {
2382 if (srcnidp != NULL)
2383 *srcnidp = ni->ni_nid;
2384 if (orderp != NULL)
2385 *orderp = order;
2386 lnet_net_unlock(cpt);
2387 return 1;
2388 }
2389
2390 order++;
2391 }
2392
2393 rn_list = lnet_net2rnethash(dstnet);
2394 list_for_each(e, rn_list) {
2395 rnet = list_entry(e, lnet_remotenet_t, lrn_list);
2396
2397 if (rnet->lrn_net == dstnet) {
2398 lnet_route_t *route;
2399 lnet_route_t *shortest = NULL;
2400
2401 LASSERT(!list_empty(&rnet->lrn_routes));
2402
2403 list_for_each_entry(route, &rnet->lrn_routes,
2404 lr_list) {
2405 if (shortest == NULL ||
2406 route->lr_hops < shortest->lr_hops)
2407 shortest = route;
2408 }
2409
2410 LASSERT(shortest != NULL);
2411 hops = shortest->lr_hops;
2412 if (srcnidp != NULL)
2413 *srcnidp = shortest->lr_gateway->lp_ni->ni_nid;
2414 if (orderp != NULL)
2415 *orderp = order;
2416 lnet_net_unlock(cpt);
2417 return hops + 1;
2418 }
2419 order++;
2420 }
2421
2422 lnet_net_unlock(cpt);
2423 return -EHOSTUNREACH;
2424 }
2425 EXPORT_SYMBOL(LNetDist);
2426
2427 /**
2428 * Set the number of asynchronous messages expected from a target process.
2429 *
2430 * This function is only meaningful for userspace callers. It's a no-op when
2431 * called from kernel.
2432 *
2433 * Asynchronous messages are those that can come from a target when the
2434 * userspace process is not waiting for IO to complete; e.g., AST callbacks
2435 * from Lustre servers. Specifying the expected number of such messages
2436 * allows them to be eagerly received when user process is not running in
2437 * LNet; otherwise network errors may occur.
2438 *
2439 * \param id Process ID of the target process.
2440 * \param nasync Number of asynchronous messages expected from the target.
2441 *
2442 * \return 0 on success, and an error code otherwise.
2443 */
2444 int
2445 LNetSetAsync(lnet_process_id_t id, int nasync)
2446 {
2447 return 0;
2448 }
2449 EXPORT_SYMBOL(LNetSetAsync);
Linux kernel - Deliverables
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