projects / deliverable / linux.git / blob
? search:


e5a8dbc0a063010a0ea1622948865a4d0fea8057
[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, 2015, 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 "../../include/linux/lnet/lib-lnet.h"
44
45 /** lnet message has credit and can be submitted to lnd for send/receive */
46 #define LNET_CREDIT_OK 0
47 /** lnet message is waiting for credit */
48 #define LNET_CREDIT_WAIT 1
49
50 static int local_nid_dist_zero = 1;
51 module_param(local_nid_dist_zero, int, 0444);
52 MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
53
54 int
55 lnet_fail_nid(lnet_nid_t nid, unsigned int threshold)
56 {
57 lnet_test_peer_t *tp;
58 struct list_head *el;
59 struct list_head *next;
60 struct list_head cull;
61
62 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
63 if (threshold) {
64 /* Adding a new entry */
65 LIBCFS_ALLOC(tp, sizeof(*tp));
66 if (!tp)
67 return -ENOMEM;
68
69 tp->tp_nid = nid;
70 tp->tp_threshold = threshold;
71
72 lnet_net_lock(0);
73 list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers);
74 lnet_net_unlock(0);
75 return 0;
76 }
77
78 /* removing entries */
79 INIT_LIST_HEAD(&cull);
80
81 lnet_net_lock(0);
82
83 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
84 tp = list_entry(el, lnet_test_peer_t, tp_list);
85
86 if (!tp->tp_threshold || /* needs culling anyway */
87 nid == LNET_NID_ANY || /* removing all entries */
88 tp->tp_nid == nid) { /* matched this one */
89 list_del(&tp->tp_list);
90 list_add(&tp->tp_list, &cull);
91 }
92 }
93
94 lnet_net_unlock(0);
95
96 while (!list_empty(&cull)) {
97 tp = list_entry(cull.next, lnet_test_peer_t, tp_list);
98
99 list_del(&tp->tp_list);
100 LIBCFS_FREE(tp, sizeof(*tp));
101 }
102 return 0;
103 }
104
105 static int
106 fail_peer(lnet_nid_t nid, int outgoing)
107 {
108 lnet_test_peer_t *tp;
109 struct list_head *el;
110 struct list_head *next;
111 struct list_head cull;
112 int fail = 0;
113
114 INIT_LIST_HEAD(&cull);
115
116 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
117 lnet_net_lock(0);
118
119 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
120 tp = list_entry(el, lnet_test_peer_t, tp_list);
121
122 if (!tp->tp_threshold) {
123 /* zombie entry */
124 if (outgoing) {
125 /*
126 * only cull zombies on outgoing tests,
127 * since we may be at interrupt priority on
128 * incoming messages.
129 */
130 list_del(&tp->tp_list);
131 list_add(&tp->tp_list, &cull);
132 }
133 continue;
134 }
135
136 if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */
137 nid == tp->tp_nid) { /* fail this peer */
138 fail = 1;
139
140 if (tp->tp_threshold != LNET_MD_THRESH_INF) {
141 tp->tp_threshold--;
142 if (outgoing &&
143 !tp->tp_threshold) {
144 /* see above */
145 list_del(&tp->tp_list);
146 list_add(&tp->tp_list, &cull);
147 }
148 }
149 break;
150 }
151 }
152
153 lnet_net_unlock(0);
154
155 while (!list_empty(&cull)) {
156 tp = list_entry(cull.next, lnet_test_peer_t, tp_list);
157 list_del(&tp->tp_list);
158
159 LIBCFS_FREE(tp, sizeof(*tp));
160 }
161
162 return fail;
163 }
164
165 unsigned int
166 lnet_iov_nob(unsigned int niov, struct kvec *iov)
167 {
168 unsigned int nob = 0;
169
170 while (niov-- > 0)
171 nob += (iov++)->iov_len;
172
173 return nob;
174 }
175 EXPORT_SYMBOL(lnet_iov_nob);
176
177 void
178 lnet_copy_iov2iov(unsigned int ndiov, struct kvec *diov, unsigned int doffset,
179 unsigned int nsiov, struct kvec *siov, unsigned int soffset,
180 unsigned int nob)
181 {
182 /* NB diov, siov are READ-ONLY */
183 unsigned int this_nob;
184
185 if (!nob)
186 return;
187
188 /* skip complete frags before 'doffset' */
189 LASSERT(ndiov > 0);
190 while (doffset >= diov->iov_len) {
191 doffset -= diov->iov_len;
192 diov++;
193 ndiov--;
194 LASSERT(ndiov > 0);
195 }
196
197 /* skip complete frags before 'soffset' */
198 LASSERT(nsiov > 0);
199 while (soffset >= siov->iov_len) {
200 soffset -= siov->iov_len;
201 siov++;
202 nsiov--;
203 LASSERT(nsiov > 0);
204 }
205
206 do {
207 LASSERT(ndiov > 0);
208 LASSERT(nsiov > 0);
209 this_nob = min(diov->iov_len - doffset,
210 siov->iov_len - soffset);
211 this_nob = min(this_nob, nob);
212
213 memcpy((char *)diov->iov_base + doffset,
214 (char *)siov->iov_base + soffset, this_nob);
215 nob -= this_nob;
216
217 if (diov->iov_len > doffset + this_nob) {
218 doffset += this_nob;
219 } else {
220 diov++;
221 ndiov--;
222 doffset = 0;
223 }
224
225 if (siov->iov_len > soffset + this_nob) {
226 soffset += this_nob;
227 } else {
228 siov++;
229 nsiov--;
230 soffset = 0;
231 }
232 } while (nob > 0);
233 }
234 EXPORT_SYMBOL(lnet_copy_iov2iov);
235
236 int
237 lnet_extract_iov(int dst_niov, struct kvec *dst,
238 int src_niov, struct kvec *src,
239 unsigned int offset, unsigned int len)
240 {
241 /*
242 * Initialise 'dst' to the subset of 'src' starting at 'offset',
243 * for exactly 'len' bytes, and return the number of entries.
244 * NB not destructive to 'src'
245 */
246 unsigned int frag_len;
247 unsigned int niov;
248
249 if (!len) /* no data => */
250 return 0; /* no frags */
251
252 LASSERT(src_niov > 0);
253 while (offset >= src->iov_len) { /* skip initial frags */
254 offset -= src->iov_len;
255 src_niov--;
256 src++;
257 LASSERT(src_niov > 0);
258 }
259
260 niov = 1;
261 for (;;) {
262 LASSERT(src_niov > 0);
263 LASSERT((int)niov <= dst_niov);
264
265 frag_len = src->iov_len - offset;
266 dst->iov_base = ((char *)src->iov_base) + offset;
267
268 if (len <= frag_len) {
269 dst->iov_len = len;
270 return niov;
271 }
272
273 dst->iov_len = frag_len;
274
275 len -= frag_len;
276 dst++;
277 src++;
278 niov++;
279 src_niov--;
280 offset = 0;
281 }
282 }
283 EXPORT_SYMBOL(lnet_extract_iov);
284
285 unsigned int
286 lnet_kiov_nob(unsigned int niov, lnet_kiov_t *kiov)
287 {
288 unsigned int nob = 0;
289
290 while (niov-- > 0)
291 nob += (kiov++)->kiov_len;
292
293 return nob;
294 }
295 EXPORT_SYMBOL(lnet_kiov_nob);
296
297 void
298 lnet_copy_kiov2kiov(unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset,
299 unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset,
300 unsigned int nob)
301 {
302 /* NB diov, siov are READ-ONLY */
303 unsigned int this_nob;
304 char *daddr = NULL;
305 char *saddr = NULL;
306
307 if (!nob)
308 return;
309
310 LASSERT(!in_interrupt());
311
312 LASSERT(ndiov > 0);
313 while (doffset >= diov->kiov_len) {
314 doffset -= diov->kiov_len;
315 diov++;
316 ndiov--;
317 LASSERT(ndiov > 0);
318 }
319
320 LASSERT(nsiov > 0);
321 while (soffset >= siov->kiov_len) {
322 soffset -= siov->kiov_len;
323 siov++;
324 nsiov--;
325 LASSERT(nsiov > 0);
326 }
327
328 do {
329 LASSERT(ndiov > 0);
330 LASSERT(nsiov > 0);
331 this_nob = min(diov->kiov_len - doffset,
332 siov->kiov_len - soffset);
333 this_nob = min(this_nob, nob);
334
335 if (!daddr)
336 daddr = ((char *)kmap(diov->kiov_page)) +
337 diov->kiov_offset + doffset;
338 if (!saddr)
339 saddr = ((char *)kmap(siov->kiov_page)) +
340 siov->kiov_offset + soffset;
341
342 /*
343 * Vanishing risk of kmap deadlock when mapping 2 pages.
344 * However in practice at least one of the kiovs will be mapped
345 * kernel pages and the map/unmap will be NOOPs
346 */
347 memcpy(daddr, saddr, this_nob);
348 nob -= this_nob;
349
350 if (diov->kiov_len > doffset + this_nob) {
351 daddr += this_nob;
352 doffset += this_nob;
353 } else {
354 kunmap(diov->kiov_page);
355 daddr = NULL;
356 diov++;
357 ndiov--;
358 doffset = 0;
359 }
360
361 if (siov->kiov_len > soffset + this_nob) {
362 saddr += this_nob;
363 soffset += this_nob;
364 } else {
365 kunmap(siov->kiov_page);
366 saddr = NULL;
367 siov++;
368 nsiov--;
369 soffset = 0;
370 }
371 } while (nob > 0);
372
373 if (daddr)
374 kunmap(diov->kiov_page);
375 if (saddr)
376 kunmap(siov->kiov_page);
377 }
378 EXPORT_SYMBOL(lnet_copy_kiov2kiov);
379
380 void
381 lnet_copy_kiov2iov(unsigned int niov, struct kvec *iov, unsigned int iovoffset,
382 unsigned int nkiov, lnet_kiov_t *kiov,
383 unsigned int kiovoffset, unsigned int nob)
384 {
385 /* NB iov, kiov are READ-ONLY */
386 unsigned int this_nob;
387 char *addr = NULL;
388
389 if (!nob)
390 return;
391
392 LASSERT(!in_interrupt());
393
394 LASSERT(niov > 0);
395 while (iovoffset >= iov->iov_len) {
396 iovoffset -= iov->iov_len;
397 iov++;
398 niov--;
399 LASSERT(niov > 0);
400 }
401
402 LASSERT(nkiov > 0);
403 while (kiovoffset >= kiov->kiov_len) {
404 kiovoffset -= kiov->kiov_len;
405 kiov++;
406 nkiov--;
407 LASSERT(nkiov > 0);
408 }
409
410 do {
411 LASSERT(niov > 0);
412 LASSERT(nkiov > 0);
413 this_nob = min(iov->iov_len - iovoffset,
414 (__kernel_size_t) kiov->kiov_len - kiovoffset);
415 this_nob = min(this_nob, nob);
416
417 if (!addr)
418 addr = ((char *)kmap(kiov->kiov_page)) +
419 kiov->kiov_offset + kiovoffset;
420
421 memcpy((char *)iov->iov_base + iovoffset, addr, this_nob);
422 nob -= this_nob;
423
424 if (iov->iov_len > iovoffset + this_nob) {
425 iovoffset += this_nob;
426 } else {
427 iov++;
428 niov--;
429 iovoffset = 0;
430 }
431
432 if (kiov->kiov_len > kiovoffset + this_nob) {
433 addr += this_nob;
434 kiovoffset += this_nob;
435 } else {
436 kunmap(kiov->kiov_page);
437 addr = NULL;
438 kiov++;
439 nkiov--;
440 kiovoffset = 0;
441 }
442
443 } while (nob > 0);
444
445 if (addr)
446 kunmap(kiov->kiov_page);
447 }
448 EXPORT_SYMBOL(lnet_copy_kiov2iov);
449
450 void
451 lnet_copy_iov2kiov(unsigned int nkiov, lnet_kiov_t *kiov,
452 unsigned int kiovoffset, unsigned int niov,
453 struct kvec *iov, unsigned int iovoffset,
454 unsigned int nob)
455 {
456 /* NB kiov, iov are READ-ONLY */
457 unsigned int this_nob;
458 char *addr = NULL;
459
460 if (!nob)
461 return;
462
463 LASSERT(!in_interrupt());
464
465 LASSERT(nkiov > 0);
466 while (kiovoffset >= kiov->kiov_len) {
467 kiovoffset -= kiov->kiov_len;
468 kiov++;
469 nkiov--;
470 LASSERT(nkiov > 0);
471 }
472
473 LASSERT(niov > 0);
474 while (iovoffset >= iov->iov_len) {
475 iovoffset -= iov->iov_len;
476 iov++;
477 niov--;
478 LASSERT(niov > 0);
479 }
480
481 do {
482 LASSERT(nkiov > 0);
483 LASSERT(niov > 0);
484 this_nob = min((__kernel_size_t) kiov->kiov_len - kiovoffset,
485 iov->iov_len - iovoffset);
486 this_nob = min(this_nob, nob);
487
488 if (!addr)
489 addr = ((char *)kmap(kiov->kiov_page)) +
490 kiov->kiov_offset + kiovoffset;
491
492 memcpy(addr, (char *)iov->iov_base + iovoffset, this_nob);
493 nob -= this_nob;
494
495 if (kiov->kiov_len > kiovoffset + this_nob) {
496 addr += this_nob;
497 kiovoffset += this_nob;
498 } else {
499 kunmap(kiov->kiov_page);
500 addr = NULL;
501 kiov++;
502 nkiov--;
503 kiovoffset = 0;
504 }
505
506 if (iov->iov_len > iovoffset + this_nob) {
507 iovoffset += this_nob;
508 } else {
509 iov++;
510 niov--;
511 iovoffset = 0;
512 }
513 } while (nob > 0);
514
515 if (addr)
516 kunmap(kiov->kiov_page);
517 }
518 EXPORT_SYMBOL(lnet_copy_iov2kiov);
519
520 int
521 lnet_extract_kiov(int dst_niov, lnet_kiov_t *dst,
522 int src_niov, lnet_kiov_t *src,
523 unsigned int offset, unsigned int len)
524 {
525 /*
526 * Initialise 'dst' to the subset of 'src' starting at 'offset',
527 * for exactly 'len' bytes, and return the number of entries.
528 * NB not destructive to 'src'
529 */
530 unsigned int frag_len;
531 unsigned int niov;
532
533 if (!len) /* no data => */
534 return 0; /* no frags */
535
536 LASSERT(src_niov > 0);
537 while (offset >= src->kiov_len) { /* skip initial frags */
538 offset -= src->kiov_len;
539 src_niov--;
540 src++;
541 LASSERT(src_niov > 0);
542 }
543
544 niov = 1;
545 for (;;) {
546 LASSERT(src_niov > 0);
547 LASSERT((int)niov <= dst_niov);
548
549 frag_len = src->kiov_len - offset;
550 dst->kiov_page = src->kiov_page;
551 dst->kiov_offset = src->kiov_offset + offset;
552
553 if (len <= frag_len) {
554 dst->kiov_len = len;
555 LASSERT(dst->kiov_offset + dst->kiov_len
556 <= PAGE_CACHE_SIZE);
557 return niov;
558 }
559
560 dst->kiov_len = frag_len;
561 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_CACHE_SIZE);
562
563 len -= frag_len;
564 dst++;
565 src++;
566 niov++;
567 src_niov--;
568 offset = 0;
569 }
570 }
571 EXPORT_SYMBOL(lnet_extract_kiov);
572
573 static void
574 lnet_ni_recv(lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
575 unsigned int offset, unsigned int mlen, unsigned int rlen)
576 {
577 unsigned int niov = 0;
578 struct kvec *iov = NULL;
579 lnet_kiov_t *kiov = NULL;
580 int rc;
581
582 LASSERT(!in_interrupt());
583 LASSERT(!mlen || msg);
584
585 if (msg) {
586 LASSERT(msg->msg_receiving);
587 LASSERT(!msg->msg_sending);
588 LASSERT(rlen == msg->msg_len);
589 LASSERT(mlen <= msg->msg_len);
590 LASSERT(msg->msg_offset == offset);
591 LASSERT(msg->msg_wanted == mlen);
592
593 msg->msg_receiving = 0;
594
595 if (mlen) {
596 niov = msg->msg_niov;
597 iov = msg->msg_iov;
598 kiov = msg->msg_kiov;
599
600 LASSERT(niov > 0);
601 LASSERT(!iov != !kiov);
602 }
603 }
604
605 rc = ni->ni_lnd->lnd_recv(ni, private, msg, delayed,
606 niov, iov, kiov, offset, mlen, rlen);
607 if (rc < 0)
608 lnet_finalize(ni, msg, rc);
609 }
610
611 static void
612 lnet_setpayloadbuffer(lnet_msg_t *msg)
613 {
614 lnet_libmd_t *md = msg->msg_md;
615
616 LASSERT(msg->msg_len > 0);
617 LASSERT(!msg->msg_routing);
618 LASSERT(md);
619 LASSERT(!msg->msg_niov);
620 LASSERT(!msg->msg_iov);
621 LASSERT(!msg->msg_kiov);
622
623 msg->msg_niov = md->md_niov;
624 if (md->md_options & LNET_MD_KIOV)
625 msg->msg_kiov = md->md_iov.kiov;
626 else
627 msg->msg_iov = md->md_iov.iov;
628 }
629
630 void
631 lnet_prep_send(lnet_msg_t *msg, int type, lnet_process_id_t target,
632 unsigned int offset, unsigned int len)
633 {
634 msg->msg_type = type;
635 msg->msg_target = target;
636 msg->msg_len = len;
637 msg->msg_offset = offset;
638
639 if (len)
640 lnet_setpayloadbuffer(msg);
641
642 memset(&msg->msg_hdr, 0, sizeof(msg->msg_hdr));
643 msg->msg_hdr.type = cpu_to_le32(type);
644 msg->msg_hdr.dest_nid = cpu_to_le64(target.nid);
645 msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
646 /* src_nid will be set later */
647 msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
648 msg->msg_hdr.payload_length = cpu_to_le32(len);
649 }
650
651 static void
652 lnet_ni_send(lnet_ni_t *ni, lnet_msg_t *msg)
653 {
654 void *priv = msg->msg_private;
655 int rc;
656
657 LASSERT(!in_interrupt());
658 LASSERT(LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
659 (msg->msg_txcredit && msg->msg_peertxcredit));
660
661 rc = ni->ni_lnd->lnd_send(ni, priv, msg);
662 if (rc < 0)
663 lnet_finalize(ni, msg, rc);
664 }
665
666 static int
667 lnet_ni_eager_recv(lnet_ni_t *ni, lnet_msg_t *msg)
668 {
669 int rc;
670
671 LASSERT(!msg->msg_sending);
672 LASSERT(msg->msg_receiving);
673 LASSERT(!msg->msg_rx_ready_delay);
674 LASSERT(ni->ni_lnd->lnd_eager_recv);
675
676 msg->msg_rx_ready_delay = 1;
677 rc = ni->ni_lnd->lnd_eager_recv(ni, msg->msg_private, msg,
678 &msg->msg_private);
679 if (rc) {
680 CERROR("recv from %s / send to %s aborted: eager_recv failed %d\n",
681 libcfs_nid2str(msg->msg_rxpeer->lp_nid),
682 libcfs_id2str(msg->msg_target), rc);
683 LASSERT(rc < 0); /* required by my callers */
684 }
685
686 return rc;
687 }
688
689 /* NB: caller shall hold a ref on 'lp' as I'd drop lnet_net_lock */
690 static void
691 lnet_ni_query_locked(lnet_ni_t *ni, lnet_peer_t *lp)
692 {
693 unsigned long last_alive = 0;
694
695 LASSERT(lnet_peer_aliveness_enabled(lp));
696 LASSERT(ni->ni_lnd->lnd_query);
697
698 lnet_net_unlock(lp->lp_cpt);
699 ni->ni_lnd->lnd_query(ni, lp->lp_nid, &last_alive);
700 lnet_net_lock(lp->lp_cpt);
701
702 lp->lp_last_query = cfs_time_current();
703
704 if (last_alive) /* NI has updated timestamp */
705 lp->lp_last_alive = last_alive;
706 }
707
708 /* NB: always called with lnet_net_lock held */
709 static inline int
710 lnet_peer_is_alive(lnet_peer_t *lp, unsigned long now)
711 {
712 int alive;
713 unsigned long deadline;
714
715 LASSERT(lnet_peer_aliveness_enabled(lp));
716
717 /* Trust lnet_notify() if it has more recent aliveness news, but
718 * ignore the initial assumed death (see lnet_peers_start_down()).
719 */
720 if (!lp->lp_alive && lp->lp_alive_count > 0 &&
721 cfs_time_aftereq(lp->lp_timestamp, lp->lp_last_alive))
722 return 0;
723
724 deadline = cfs_time_add(lp->lp_last_alive,
725 cfs_time_seconds(lp->lp_ni->ni_peertimeout));
726 alive = cfs_time_after(deadline, now);
727
728 /* Update obsolete lp_alive except for routers assumed to be dead
729 * initially, because router checker would update aliveness in this
730 * case, and moreover lp_last_alive at peer creation is assumed.
731 */
732 if (alive && !lp->lp_alive &&
733 !(lnet_isrouter(lp) && !lp->lp_alive_count))
734 lnet_notify_locked(lp, 0, 1, lp->lp_last_alive);
735
736 return alive;
737 }
738
739 /*
740 * NB: returns 1 when alive, 0 when dead, negative when error;
741 * may drop the lnet_net_lock
742 */
743 static int
744 lnet_peer_alive_locked(lnet_peer_t *lp)
745 {
746 unsigned long now = cfs_time_current();
747
748 if (!lnet_peer_aliveness_enabled(lp))
749 return -ENODEV;
750
751 if (lnet_peer_is_alive(lp, now))
752 return 1;
753
754 /*
755 * Peer appears dead, but we should avoid frequent NI queries (at
756 * most once per lnet_queryinterval seconds).
757 */
758 if (lp->lp_last_query) {
759 static const int lnet_queryinterval = 1;
760
761 unsigned long next_query =
762 cfs_time_add(lp->lp_last_query,
763 cfs_time_seconds(lnet_queryinterval));
764
765 if (time_before(now, next_query)) {
766 if (lp->lp_alive)
767 CWARN("Unexpected aliveness of peer %s: %d < %d (%d/%d)\n",
768 libcfs_nid2str(lp->lp_nid),
769 (int)now, (int)next_query,
770 lnet_queryinterval,
771 lp->lp_ni->ni_peertimeout);
772 return 0;
773 }
774 }
775
776 /* query NI for latest aliveness news */
777 lnet_ni_query_locked(lp->lp_ni, lp);
778
779 if (lnet_peer_is_alive(lp, now))
780 return 1;
781
782 lnet_notify_locked(lp, 0, 0, lp->lp_last_alive);
783 return 0;
784 }
785
786 /**
787 * \param msg The message to be sent.
788 * \param do_send True if lnet_ni_send() should be called in this function.
789 * lnet_send() is going to lnet_net_unlock immediately after this, so
790 * it sets do_send FALSE and I don't do the unlock/send/lock bit.
791 *
792 * \retval LNET_CREDIT_OK If \a msg sent or OK to send.
793 * \retval LNET_CREDIT_WAIT If \a msg blocked for credit.
794 * \retval -EHOSTUNREACH If the next hop of the message appears dead.
795 * \retval -ECANCELED If the MD of the message has been unlinked.
796 */
797 static int
798 lnet_post_send_locked(lnet_msg_t *msg, int do_send)
799 {
800 lnet_peer_t *lp = msg->msg_txpeer;
801 lnet_ni_t *ni = lp->lp_ni;
802 int cpt = msg->msg_tx_cpt;
803 struct lnet_tx_queue *tq = ni->ni_tx_queues[cpt];
804
805 /* non-lnet_send() callers have checked before */
806 LASSERT(!do_send || msg->msg_tx_delayed);
807 LASSERT(!msg->msg_receiving);
808 LASSERT(msg->msg_tx_committed);
809
810 /* NB 'lp' is always the next hop */
811 if (!(msg->msg_target.pid & LNET_PID_USERFLAG) &&
812 !lnet_peer_alive_locked(lp)) {
813 the_lnet.ln_counters[cpt]->drop_count++;
814 the_lnet.ln_counters[cpt]->drop_length += msg->msg_len;
815 lnet_net_unlock(cpt);
816
817 CNETERR("Dropping message for %s: peer not alive\n",
818 libcfs_id2str(msg->msg_target));
819 if (do_send)
820 lnet_finalize(ni, msg, -EHOSTUNREACH);
821
822 lnet_net_lock(cpt);
823 return -EHOSTUNREACH;
824 }
825
826 if (msg->msg_md &&
827 (msg->msg_md->md_flags & LNET_MD_FLAG_ABORTED)) {
828 lnet_net_unlock(cpt);
829
830 CNETERR("Aborting message for %s: LNetM[DE]Unlink() already called on the MD/ME.\n",
831 libcfs_id2str(msg->msg_target));
832 if (do_send)
833 lnet_finalize(ni, msg, -ECANCELED);
834
835 lnet_net_lock(cpt);
836 return -ECANCELED;
837 }
838
839 if (!msg->msg_peertxcredit) {
840 LASSERT((lp->lp_txcredits < 0) ==
841 !list_empty(&lp->lp_txq));
842
843 msg->msg_peertxcredit = 1;
844 lp->lp_txqnob += msg->msg_len + sizeof(lnet_hdr_t);
845 lp->lp_txcredits--;
846
847 if (lp->lp_txcredits < lp->lp_mintxcredits)
848 lp->lp_mintxcredits = lp->lp_txcredits;
849
850 if (lp->lp_txcredits < 0) {
851 msg->msg_tx_delayed = 1;
852 list_add_tail(&msg->msg_list, &lp->lp_txq);
853 return LNET_CREDIT_WAIT;
854 }
855 }
856
857 if (!msg->msg_txcredit) {
858 LASSERT((tq->tq_credits < 0) ==
859 !list_empty(&tq->tq_delayed));
860
861 msg->msg_txcredit = 1;
862 tq->tq_credits--;
863
864 if (tq->tq_credits < tq->tq_credits_min)
865 tq->tq_credits_min = tq->tq_credits;
866
867 if (tq->tq_credits < 0) {
868 msg->msg_tx_delayed = 1;
869 list_add_tail(&msg->msg_list, &tq->tq_delayed);
870 return LNET_CREDIT_WAIT;
871 }
872 }
873
874 if (do_send) {
875 lnet_net_unlock(cpt);
876 lnet_ni_send(ni, msg);
877 lnet_net_lock(cpt);
878 }
879 return LNET_CREDIT_OK;
880 }
881
882 static lnet_rtrbufpool_t *
883 lnet_msg2bufpool(lnet_msg_t *msg)
884 {
885 lnet_rtrbufpool_t *rbp;
886 int cpt;
887
888 LASSERT(msg->msg_rx_committed);
889
890 cpt = msg->msg_rx_cpt;
891 rbp = &the_lnet.ln_rtrpools[cpt][0];
892
893 LASSERT(msg->msg_len <= LNET_MTU);
894 while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_CACHE_SIZE) {
895 rbp++;
896 LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]);
897 }
898
899 return rbp;
900 }
901
902 static int
903 lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv)
904 {
905 /*
906 * lnet_parse is going to lnet_net_unlock immediately after this, so it
907 * sets do_recv FALSE and I don't do the unlock/send/lock bit.
908 * I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if
909 * received or OK to receive
910 */
911 lnet_peer_t *lp = msg->msg_rxpeer;
912 lnet_rtrbufpool_t *rbp;
913 lnet_rtrbuf_t *rb;
914
915 LASSERT(!msg->msg_iov);
916 LASSERT(!msg->msg_kiov);
917 LASSERT(!msg->msg_niov);
918 LASSERT(msg->msg_routing);
919 LASSERT(msg->msg_receiving);
920 LASSERT(!msg->msg_sending);
921
922 /* non-lnet_parse callers only receive delayed messages */
923 LASSERT(!do_recv || msg->msg_rx_delayed);
924
925 if (!msg->msg_peerrtrcredit) {
926 LASSERT((lp->lp_rtrcredits < 0) ==
927 !list_empty(&lp->lp_rtrq));
928
929 msg->msg_peerrtrcredit = 1;
930 lp->lp_rtrcredits--;
931 if (lp->lp_rtrcredits < lp->lp_minrtrcredits)
932 lp->lp_minrtrcredits = lp->lp_rtrcredits;
933
934 if (lp->lp_rtrcredits < 0) {
935 /* must have checked eager_recv before here */
936 LASSERT(msg->msg_rx_ready_delay);
937 msg->msg_rx_delayed = 1;
938 list_add_tail(&msg->msg_list, &lp->lp_rtrq);
939 return LNET_CREDIT_WAIT;
940 }
941 }
942
943 rbp = lnet_msg2bufpool(msg);
944
945 if (!msg->msg_rtrcredit) {
946 msg->msg_rtrcredit = 1;
947 rbp->rbp_credits--;
948 if (rbp->rbp_credits < rbp->rbp_mincredits)
949 rbp->rbp_mincredits = rbp->rbp_credits;
950
951 if (rbp->rbp_credits < 0) {
952 /* must have checked eager_recv before here */
953 LASSERT(msg->msg_rx_ready_delay);
954 msg->msg_rx_delayed = 1;
955 list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
956 return LNET_CREDIT_WAIT;
957 }
958 }
959
960 LASSERT(!list_empty(&rbp->rbp_bufs));
961 rb = list_entry(rbp->rbp_bufs.next, lnet_rtrbuf_t, rb_list);
962 list_del(&rb->rb_list);
963
964 msg->msg_niov = rbp->rbp_npages;
965 msg->msg_kiov = &rb->rb_kiov[0];
966
967 if (do_recv) {
968 int cpt = msg->msg_rx_cpt;
969
970 lnet_net_unlock(cpt);
971 lnet_ni_recv(lp->lp_ni, msg->msg_private, msg, 1,
972 0, msg->msg_len, msg->msg_len);
973 lnet_net_lock(cpt);
974 }
975 return LNET_CREDIT_OK;
976 }
977
978 void
979 lnet_return_tx_credits_locked(lnet_msg_t *msg)
980 {
981 lnet_peer_t *txpeer = msg->msg_txpeer;
982 lnet_msg_t *msg2;
983
984 if (msg->msg_txcredit) {
985 struct lnet_ni *ni = txpeer->lp_ni;
986 struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt];
987
988 /* give back NI txcredits */
989 msg->msg_txcredit = 0;
990
991 LASSERT((tq->tq_credits < 0) ==
992 !list_empty(&tq->tq_delayed));
993
994 tq->tq_credits++;
995 if (tq->tq_credits <= 0) {
996 msg2 = list_entry(tq->tq_delayed.next,
997 lnet_msg_t, msg_list);
998 list_del(&msg2->msg_list);
999
1000 LASSERT(msg2->msg_txpeer->lp_ni == ni);
1001 LASSERT(msg2->msg_tx_delayed);
1002
1003 (void) lnet_post_send_locked(msg2, 1);
1004 }
1005 }
1006
1007 if (msg->msg_peertxcredit) {
1008 /* give back peer txcredits */
1009 msg->msg_peertxcredit = 0;
1010
1011 LASSERT((txpeer->lp_txcredits < 0) ==
1012 !list_empty(&txpeer->lp_txq));
1013
1014 txpeer->lp_txqnob -= msg->msg_len + sizeof(lnet_hdr_t);
1015 LASSERT(txpeer->lp_txqnob >= 0);
1016
1017 txpeer->lp_txcredits++;
1018 if (txpeer->lp_txcredits <= 0) {
1019 msg2 = list_entry(txpeer->lp_txq.next,
1020 lnet_msg_t, msg_list);
1021 list_del(&msg2->msg_list);
1022
1023 LASSERT(msg2->msg_txpeer == txpeer);
1024 LASSERT(msg2->msg_tx_delayed);
1025
1026 (void) lnet_post_send_locked(msg2, 1);
1027 }
1028 }
1029
1030 if (txpeer) {
1031 msg->msg_txpeer = NULL;
1032 lnet_peer_decref_locked(txpeer);
1033 }
1034 }
1035
1036 void
1037 lnet_schedule_blocked_locked(lnet_rtrbufpool_t *rbp)
1038 {
1039 lnet_msg_t *msg;
1040
1041 if (list_empty(&rbp->rbp_msgs))
1042 return;
1043 msg = list_entry(rbp->rbp_msgs.next,
1044 lnet_msg_t, msg_list);
1045 list_del(&msg->msg_list);
1046
1047 (void)lnet_post_routed_recv_locked(msg, 1);
1048 }
1049
1050 void
1051 lnet_drop_routed_msgs_locked(struct list_head *list, int cpt)
1052 {
1053 struct list_head drop;
1054 lnet_msg_t *msg;
1055 lnet_msg_t *tmp;
1056
1057 INIT_LIST_HEAD(&drop);
1058
1059 list_splice_init(list, &drop);
1060
1061 lnet_net_unlock(cpt);
1062
1063 list_for_each_entry_safe(msg, tmp, &drop, msg_list) {
1064 lnet_ni_recv(msg->msg_rxpeer->lp_ni, msg->msg_private, NULL,
1065 0, 0, 0, msg->msg_hdr.payload_length);
1066 list_del_init(&msg->msg_list);
1067 lnet_finalize(NULL, msg, -ECANCELED);
1068 }
1069
1070 lnet_net_lock(cpt);
1071 }
1072
1073 void
1074 lnet_return_rx_credits_locked(lnet_msg_t *msg)
1075 {
1076 lnet_peer_t *rxpeer = msg->msg_rxpeer;
1077 lnet_msg_t *msg2;
1078
1079 if (msg->msg_rtrcredit) {
1080 /* give back global router credits */
1081 lnet_rtrbuf_t *rb;
1082 lnet_rtrbufpool_t *rbp;
1083
1084 /*
1085 * NB If a msg ever blocks for a buffer in rbp_msgs, it stays
1086 * there until it gets one allocated, or aborts the wait
1087 * itself
1088 */
1089 LASSERT(msg->msg_kiov);
1090
1091 rb = list_entry(msg->msg_kiov, lnet_rtrbuf_t, rb_kiov[0]);
1092 rbp = rb->rb_pool;
1093
1094 msg->msg_kiov = NULL;
1095 msg->msg_rtrcredit = 0;
1096
1097 LASSERT(rbp == lnet_msg2bufpool(msg));
1098
1099 LASSERT((rbp->rbp_credits > 0) ==
1100 !list_empty(&rbp->rbp_bufs));
1101
1102 /*
1103 * If routing is now turned off, we just drop this buffer and
1104 * don't bother trying to return credits.
1105 */
1106 if (!the_lnet.ln_routing) {
1107 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1108 goto routing_off;
1109 }
1110
1111 /*
1112 * It is possible that a user has lowered the desired number of
1113 * buffers in this pool. Make sure we never put back
1114 * more buffers than the stated number.
1115 */
1116 if (rbp->rbp_credits >= rbp->rbp_nbuffers) {
1117 /* Discard this buffer so we don't have too many. */
1118 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1119 } else {
1120 list_add(&rb->rb_list, &rbp->rbp_bufs);
1121 rbp->rbp_credits++;
1122 if (rbp->rbp_credits <= 0)
1123 lnet_schedule_blocked_locked(rbp);
1124 }
1125 }
1126
1127 routing_off:
1128 if (msg->msg_peerrtrcredit) {
1129 /* give back peer router credits */
1130 msg->msg_peerrtrcredit = 0;
1131
1132 LASSERT((rxpeer->lp_rtrcredits < 0) ==
1133 !list_empty(&rxpeer->lp_rtrq));
1134
1135 rxpeer->lp_rtrcredits++;
1136 /*
1137 * drop all messages which are queued to be routed on that
1138 * peer.
1139 */
1140 if (!the_lnet.ln_routing) {
1141 lnet_drop_routed_msgs_locked(&rxpeer->lp_rtrq,
1142 msg->msg_rx_cpt);
1143 } else if (rxpeer->lp_rtrcredits <= 0) {
1144 msg2 = list_entry(rxpeer->lp_rtrq.next,
1145 lnet_msg_t, msg_list);
1146 list_del(&msg2->msg_list);
1147
1148 (void) lnet_post_routed_recv_locked(msg2, 1);
1149 }
1150 }
1151 if (rxpeer) {
1152 msg->msg_rxpeer = NULL;
1153 lnet_peer_decref_locked(rxpeer);
1154 }
1155 }
1156
1157 static int
1158 lnet_compare_routes(lnet_route_t *r1, lnet_route_t *r2)
1159 {
1160 lnet_peer_t *p1 = r1->lr_gateway;
1161 lnet_peer_t *p2 = r2->lr_gateway;
1162
1163 if (r1->lr_priority < r2->lr_priority)
1164 return 1;
1165
1166 if (r1->lr_priority > r2->lr_priority)
1167 return -1;
1168
1169 if (r1->lr_hops < r2->lr_hops)
1170 return 1;
1171
1172 if (r1->lr_hops > r2->lr_hops)
1173 return -1;
1174
1175 if (p1->lp_txqnob < p2->lp_txqnob)
1176 return 1;
1177
1178 if (p1->lp_txqnob > p2->lp_txqnob)
1179 return -1;
1180
1181 if (p1->lp_txcredits > p2->lp_txcredits)
1182 return 1;
1183
1184 if (p1->lp_txcredits < p2->lp_txcredits)
1185 return -1;
1186
1187 if (r1->lr_seq - r2->lr_seq <= 0)
1188 return 1;
1189
1190 return -1;
1191 }
1192
1193 static lnet_peer_t *
1194 lnet_find_route_locked(lnet_ni_t *ni, lnet_nid_t target, lnet_nid_t rtr_nid)
1195 {
1196 lnet_remotenet_t *rnet;
1197 lnet_route_t *route;
1198 lnet_route_t *best_route;
1199 lnet_route_t *last_route;
1200 struct lnet_peer *lp_best;
1201 struct lnet_peer *lp;
1202 int rc;
1203
1204 /*
1205 * If @rtr_nid is not LNET_NID_ANY, return the gateway with
1206 * rtr_nid nid, otherwise find the best gateway I can use
1207 */
1208 rnet = lnet_find_net_locked(LNET_NIDNET(target));
1209 if (!rnet)
1210 return NULL;
1211
1212 lp_best = NULL;
1213 best_route = NULL;
1214 last_route = NULL;
1215 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
1216 lp = route->lr_gateway;
1217
1218 if (!lnet_is_route_alive(route))
1219 continue;
1220
1221 if (ni && lp->lp_ni != ni)
1222 continue;
1223
1224 if (lp->lp_nid == rtr_nid) /* it's pre-determined router */
1225 return lp;
1226
1227 if (!lp_best) {
1228 best_route = route;
1229 last_route = route;
1230 lp_best = lp;
1231 continue;
1232 }
1233
1234 /* no protection on below fields, but it's harmless */
1235 if (last_route->lr_seq - route->lr_seq < 0)
1236 last_route = route;
1237
1238 rc = lnet_compare_routes(route, best_route);
1239 if (rc < 0)
1240 continue;
1241
1242 best_route = route;
1243 lp_best = lp;
1244 }
1245
1246 /*
1247 * set sequence number on the best router to the latest sequence + 1
1248 * so we can round-robin all routers, it's race and inaccurate but
1249 * harmless and functional
1250 */
1251 if (best_route)
1252 best_route->lr_seq = last_route->lr_seq + 1;
1253 return lp_best;
1254 }
1255
1256 int
1257 lnet_send(lnet_nid_t src_nid, lnet_msg_t *msg, lnet_nid_t rtr_nid)
1258 {
1259 lnet_nid_t dst_nid = msg->msg_target.nid;
1260 struct lnet_ni *src_ni;
1261 struct lnet_ni *local_ni;
1262 struct lnet_peer *lp;
1263 int cpt;
1264 int cpt2;
1265 int rc;
1266
1267 /*
1268 * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
1269 * but we might want to use pre-determined router for ACK/REPLY
1270 * in the future
1271 */
1272 /* NB: ni == interface pre-determined (ACK/REPLY) */
1273 LASSERT(!msg->msg_txpeer);
1274 LASSERT(!msg->msg_sending);
1275 LASSERT(!msg->msg_target_is_router);
1276 LASSERT(!msg->msg_receiving);
1277
1278 msg->msg_sending = 1;
1279
1280 LASSERT(!msg->msg_tx_committed);
1281 cpt = lnet_cpt_of_nid(rtr_nid == LNET_NID_ANY ? dst_nid : rtr_nid);
1282 again:
1283 lnet_net_lock(cpt);
1284
1285 if (the_lnet.ln_shutdown) {
1286 lnet_net_unlock(cpt);
1287 return -ESHUTDOWN;
1288 }
1289
1290 if (src_nid == LNET_NID_ANY) {
1291 src_ni = NULL;
1292 } else {
1293 src_ni = lnet_nid2ni_locked(src_nid, cpt);
1294 if (!src_ni) {
1295 lnet_net_unlock(cpt);
1296 LCONSOLE_WARN("Can't send to %s: src %s is not a local nid\n",
1297 libcfs_nid2str(dst_nid),
1298 libcfs_nid2str(src_nid));
1299 return -EINVAL;
1300 }
1301 LASSERT(!msg->msg_routing);
1302 }
1303
1304 /* Is this for someone on a local network? */
1305 local_ni = lnet_net2ni_locked(LNET_NIDNET(dst_nid), cpt);
1306
1307 if (local_ni) {
1308 if (!src_ni) {
1309 src_ni = local_ni;
1310 src_nid = src_ni->ni_nid;
1311 } else if (src_ni == local_ni) {
1312 lnet_ni_decref_locked(local_ni, cpt);
1313 } else {
1314 lnet_ni_decref_locked(local_ni, cpt);
1315 lnet_ni_decref_locked(src_ni, cpt);
1316 lnet_net_unlock(cpt);
1317 LCONSOLE_WARN("No route to %s via from %s\n",
1318 libcfs_nid2str(dst_nid),
1319 libcfs_nid2str(src_nid));
1320 return -EINVAL;
1321 }
1322
1323 LASSERT(src_nid != LNET_NID_ANY);
1324 lnet_msg_commit(msg, cpt);
1325
1326 if (!msg->msg_routing)
1327 msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
1328
1329 if (src_ni == the_lnet.ln_loni) {
1330 /* No send credit hassles with LOLND */
1331 lnet_net_unlock(cpt);
1332 lnet_ni_send(src_ni, msg);
1333
1334 lnet_net_lock(cpt);
1335 lnet_ni_decref_locked(src_ni, cpt);
1336 lnet_net_unlock(cpt);
1337 return 0;
1338 }
1339
1340 rc = lnet_nid2peer_locked(&lp, dst_nid, cpt);
1341 /* lp has ref on src_ni; lose mine */
1342 lnet_ni_decref_locked(src_ni, cpt);
1343 if (rc) {
1344 lnet_net_unlock(cpt);
1345 LCONSOLE_WARN("Error %d finding peer %s\n", rc,
1346 libcfs_nid2str(dst_nid));
1347 /* ENOMEM or shutting down */
1348 return rc;
1349 }
1350 LASSERT(lp->lp_ni == src_ni);
1351 } else {
1352 /* sending to a remote network */
1353 lp = lnet_find_route_locked(src_ni, dst_nid, rtr_nid);
1354 if (!lp) {
1355 if (src_ni)
1356 lnet_ni_decref_locked(src_ni, cpt);
1357 lnet_net_unlock(cpt);
1358
1359 LCONSOLE_WARN("No route to %s via %s (all routers down)\n",
1360 libcfs_id2str(msg->msg_target),
1361 libcfs_nid2str(src_nid));
1362 return -EHOSTUNREACH;
1363 }
1364
1365 /*
1366 * rtr_nid is LNET_NID_ANY or NID of pre-determined router,
1367 * it's possible that rtr_nid isn't LNET_NID_ANY and lp isn't
1368 * pre-determined router, this can happen if router table
1369 * was changed when we release the lock
1370 */
1371 if (rtr_nid != lp->lp_nid) {
1372 cpt2 = lnet_cpt_of_nid_locked(lp->lp_nid);
1373 if (cpt2 != cpt) {
1374 if (src_ni)
1375 lnet_ni_decref_locked(src_ni, cpt);
1376 lnet_net_unlock(cpt);
1377
1378 rtr_nid = lp->lp_nid;
1379 cpt = cpt2;
1380 goto again;
1381 }
1382 }
1383
1384 CDEBUG(D_NET, "Best route to %s via %s for %s %d\n",
1385 libcfs_nid2str(dst_nid), libcfs_nid2str(lp->lp_nid),
1386 lnet_msgtyp2str(msg->msg_type), msg->msg_len);
1387
1388 if (!src_ni) {
1389 src_ni = lp->lp_ni;
1390 src_nid = src_ni->ni_nid;
1391 } else {
1392 LASSERT(src_ni == lp->lp_ni);
1393 lnet_ni_decref_locked(src_ni, cpt);
1394 }
1395
1396 lnet_peer_addref_locked(lp);
1397
1398 LASSERT(src_nid != LNET_NID_ANY);
1399 lnet_msg_commit(msg, cpt);
1400
1401 if (!msg->msg_routing) {
1402 /* I'm the source and now I know which NI to send on */
1403 msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
1404 }
1405
1406 msg->msg_target_is_router = 1;
1407 msg->msg_target.nid = lp->lp_nid;
1408 msg->msg_target.pid = LNET_PID_LUSTRE;
1409 }
1410
1411 /* 'lp' is our best choice of peer */
1412
1413 LASSERT(!msg->msg_peertxcredit);
1414 LASSERT(!msg->msg_txcredit);
1415 LASSERT(!msg->msg_txpeer);
1416
1417 msg->msg_txpeer = lp; /* msg takes my ref on lp */
1418
1419 rc = lnet_post_send_locked(msg, 0);
1420 lnet_net_unlock(cpt);
1421
1422 if (rc < 0)
1423 return rc;
1424
1425 if (rc == LNET_CREDIT_OK)
1426 lnet_ni_send(src_ni, msg);
1427
1428 return 0; /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT */
1429 }
1430
1431 static void
1432 lnet_drop_message(lnet_ni_t *ni, int cpt, void *private, unsigned int nob)
1433 {
1434 lnet_net_lock(cpt);
1435 the_lnet.ln_counters[cpt]->drop_count++;
1436 the_lnet.ln_counters[cpt]->drop_length += nob;
1437 lnet_net_unlock(cpt);
1438
1439 lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
1440 }
1441
1442 static void
1443 lnet_recv_put(lnet_ni_t *ni, lnet_msg_t *msg)
1444 {
1445 lnet_hdr_t *hdr = &msg->msg_hdr;
1446
1447 if (msg->msg_wanted)
1448 lnet_setpayloadbuffer(msg);
1449
1450 lnet_build_msg_event(msg, LNET_EVENT_PUT);
1451
1452 /*
1453 * Must I ACK? If so I'll grab the ack_wmd out of the header and put
1454 * it back into the ACK during lnet_finalize()
1455 */
1456 msg->msg_ack = !lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) &&
1457 !(msg->msg_md->md_options & LNET_MD_ACK_DISABLE);
1458
1459 lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed,
1460 msg->msg_offset, msg->msg_wanted, hdr->payload_length);
1461 }
1462
1463 static int
1464 lnet_parse_put(lnet_ni_t *ni, lnet_msg_t *msg)
1465 {
1466 lnet_hdr_t *hdr = &msg->msg_hdr;
1467 struct lnet_match_info info;
1468 int rc;
1469
1470 /* Convert put fields to host byte order */
1471 hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits);
1472 hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index);
1473 hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset);
1474
1475 info.mi_id.nid = hdr->src_nid;
1476 info.mi_id.pid = hdr->src_pid;
1477 info.mi_opc = LNET_MD_OP_PUT;
1478 info.mi_portal = hdr->msg.put.ptl_index;
1479 info.mi_rlength = hdr->payload_length;
1480 info.mi_roffset = hdr->msg.put.offset;
1481 info.mi_mbits = hdr->msg.put.match_bits;
1482
1483 msg->msg_rx_ready_delay = !ni->ni_lnd->lnd_eager_recv;
1484
1485 again:
1486 rc = lnet_ptl_match_md(&info, msg);
1487 switch (rc) {
1488 default:
1489 LBUG();
1490
1491 case LNET_MATCHMD_OK:
1492 lnet_recv_put(ni, msg);
1493 return 0;
1494
1495 case LNET_MATCHMD_NONE:
1496 if (msg->msg_rx_delayed) /* attached on delayed list */
1497 return 0;
1498
1499 rc = lnet_ni_eager_recv(ni, msg);
1500 if (!rc)
1501 goto again;
1502 /* fall through */
1503
1504 case LNET_MATCHMD_DROP:
1505 CNETERR("Dropping PUT from %s portal %d match %llu offset %d length %d: %d\n",
1506 libcfs_id2str(info.mi_id), info.mi_portal,
1507 info.mi_mbits, info.mi_roffset, info.mi_rlength, rc);
1508
1509 return ENOENT; /* +ve: OK but no match */
1510 }
1511 }
1512
1513 static int
1514 lnet_parse_get(lnet_ni_t *ni, lnet_msg_t *msg, int rdma_get)
1515 {
1516 struct lnet_match_info info;
1517 lnet_hdr_t *hdr = &msg->msg_hdr;
1518 lnet_handle_wire_t reply_wmd;
1519 int rc;
1520
1521 /* Convert get fields to host byte order */
1522 hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits);
1523 hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index);
1524 hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length);
1525 hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset);
1526
1527 info.mi_id.nid = hdr->src_nid;
1528 info.mi_id.pid = hdr->src_pid;
1529 info.mi_opc = LNET_MD_OP_GET;
1530 info.mi_portal = hdr->msg.get.ptl_index;
1531 info.mi_rlength = hdr->msg.get.sink_length;
1532 info.mi_roffset = hdr->msg.get.src_offset;
1533 info.mi_mbits = hdr->msg.get.match_bits;
1534
1535 rc = lnet_ptl_match_md(&info, msg);
1536 if (rc == LNET_MATCHMD_DROP) {
1537 CNETERR("Dropping GET from %s portal %d match %llu offset %d length %d\n",
1538 libcfs_id2str(info.mi_id), info.mi_portal,
1539 info.mi_mbits, info.mi_roffset, info.mi_rlength);
1540 return ENOENT; /* +ve: OK but no match */
1541 }
1542
1543 LASSERT(rc == LNET_MATCHMD_OK);
1544
1545 lnet_build_msg_event(msg, LNET_EVENT_GET);
1546
1547 reply_wmd = hdr->msg.get.return_wmd;
1548
1549 lnet_prep_send(msg, LNET_MSG_REPLY, info.mi_id,
1550 msg->msg_offset, msg->msg_wanted);
1551
1552 msg->msg_hdr.msg.reply.dst_wmd = reply_wmd;
1553
1554 if (rdma_get) {
1555 /* The LND completes the REPLY from her recv procedure */
1556 lnet_ni_recv(ni, msg->msg_private, msg, 0,
1557 msg->msg_offset, msg->msg_len, msg->msg_len);
1558 return 0;
1559 }
1560
1561 lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0);
1562 msg->msg_receiving = 0;
1563
1564 rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY);
1565 if (rc < 0) {
1566 /* didn't get as far as lnet_ni_send() */
1567 CERROR("%s: Unable to send REPLY for GET from %s: %d\n",
1568 libcfs_nid2str(ni->ni_nid),
1569 libcfs_id2str(info.mi_id), rc);
1570
1571 lnet_finalize(ni, msg, rc);
1572 }
1573
1574 return 0;
1575 }
1576
1577 static int
1578 lnet_parse_reply(lnet_ni_t *ni, lnet_msg_t *msg)
1579 {
1580 void *private = msg->msg_private;
1581 lnet_hdr_t *hdr = &msg->msg_hdr;
1582 lnet_process_id_t src = {0};
1583 lnet_libmd_t *md;
1584 int rlength;
1585 int mlength;
1586 int cpt;
1587
1588 cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
1589 lnet_res_lock(cpt);
1590
1591 src.nid = hdr->src_nid;
1592 src.pid = hdr->src_pid;
1593
1594 /* NB handles only looked up by creator (no flips) */
1595 md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd);
1596 if (!md || !md->md_threshold || md->md_me) {
1597 CNETERR("%s: Dropping REPLY from %s for %s MD %#llx.%#llx\n",
1598 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1599 !md ? "invalid" : "inactive",
1600 hdr->msg.reply.dst_wmd.wh_interface_cookie,
1601 hdr->msg.reply.dst_wmd.wh_object_cookie);
1602 if (md && md->md_me)
1603 CERROR("REPLY MD also attached to portal %d\n",
1604 md->md_me->me_portal);
1605
1606 lnet_res_unlock(cpt);
1607 return ENOENT; /* +ve: OK but no match */
1608 }
1609
1610 LASSERT(!md->md_offset);
1611
1612 rlength = hdr->payload_length;
1613 mlength = min_t(uint, rlength, md->md_length);
1614
1615 if (mlength < rlength &&
1616 !(md->md_options & LNET_MD_TRUNCATE)) {
1617 CNETERR("%s: Dropping REPLY from %s length %d for MD %#llx would overflow (%d)\n",
1618 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1619 rlength, hdr->msg.reply.dst_wmd.wh_object_cookie,
1620 mlength);
1621 lnet_res_unlock(cpt);
1622 return ENOENT; /* +ve: OK but no match */
1623 }
1624
1625 CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md %#llx\n",
1626 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1627 mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie);
1628
1629 lnet_msg_attach_md(msg, md, 0, mlength);
1630
1631 if (mlength)
1632 lnet_setpayloadbuffer(msg);
1633
1634 lnet_res_unlock(cpt);
1635
1636 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
1637
1638 lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength);
1639 return 0;
1640 }
1641
1642 static int
1643 lnet_parse_ack(lnet_ni_t *ni, lnet_msg_t *msg)
1644 {
1645 lnet_hdr_t *hdr = &msg->msg_hdr;
1646 lnet_process_id_t src = {0};
1647 lnet_libmd_t *md;
1648 int cpt;
1649
1650 src.nid = hdr->src_nid;
1651 src.pid = hdr->src_pid;
1652
1653 /* Convert ack fields to host byte order */
1654 hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits);
1655 hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength);
1656
1657 cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie);
1658 lnet_res_lock(cpt);
1659
1660 /* NB handles only looked up by creator (no flips) */
1661 md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd);
1662 if (!md || !md->md_threshold || md->md_me) {
1663 /* Don't moan; this is expected */
1664 CDEBUG(D_NET,
1665 "%s: Dropping ACK from %s to %s MD %#llx.%#llx\n",
1666 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1667 !md ? "invalid" : "inactive",
1668 hdr->msg.ack.dst_wmd.wh_interface_cookie,
1669 hdr->msg.ack.dst_wmd.wh_object_cookie);
1670 if (md && md->md_me)
1671 CERROR("Source MD also attached to portal %d\n",
1672 md->md_me->me_portal);
1673
1674 lnet_res_unlock(cpt);
1675 return ENOENT; /* +ve! */
1676 }
1677
1678 CDEBUG(D_NET, "%s: ACK from %s into md %#llx\n",
1679 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1680 hdr->msg.ack.dst_wmd.wh_object_cookie);
1681
1682 lnet_msg_attach_md(msg, md, 0, 0);
1683
1684 lnet_res_unlock(cpt);
1685
1686 lnet_build_msg_event(msg, LNET_EVENT_ACK);
1687
1688 lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len);
1689 return 0;
1690 }
1691
1692 /**
1693 * \retval LNET_CREDIT_OK If \a msg is forwarded
1694 * \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer
1695 * \retval -ve error code
1696 */
1697 static int
1698 lnet_parse_forward_locked(lnet_ni_t *ni, lnet_msg_t *msg)
1699 {
1700 int rc = 0;
1701
1702 if (!the_lnet.ln_routing)
1703 return -ECANCELED;
1704
1705 if (msg->msg_rxpeer->lp_rtrcredits <= 0 ||
1706 lnet_msg2bufpool(msg)->rbp_credits <= 0) {
1707 if (!ni->ni_lnd->lnd_eager_recv) {
1708 msg->msg_rx_ready_delay = 1;
1709 } else {
1710 lnet_net_unlock(msg->msg_rx_cpt);
1711 rc = lnet_ni_eager_recv(ni, msg);
1712 lnet_net_lock(msg->msg_rx_cpt);
1713 }
1714 }
1715
1716 if (!rc)
1717 rc = lnet_post_routed_recv_locked(msg, 0);
1718 return rc;
1719 }
1720
1721 char *
1722 lnet_msgtyp2str(int type)
1723 {
1724 switch (type) {
1725 case LNET_MSG_ACK:
1726 return "ACK";
1727 case LNET_MSG_PUT:
1728 return "PUT";
1729 case LNET_MSG_GET:
1730 return "GET";
1731 case LNET_MSG_REPLY:
1732 return "REPLY";
1733 case LNET_MSG_HELLO:
1734 return "HELLO";
1735 default:
1736 return "<UNKNOWN>";
1737 }
1738 }
1739
1740 void
1741 lnet_print_hdr(lnet_hdr_t *hdr)
1742 {
1743 lnet_process_id_t src = {0};
1744 lnet_process_id_t dst = {0};
1745 char *type_str = lnet_msgtyp2str(hdr->type);
1746
1747 src.nid = hdr->src_nid;
1748 src.pid = hdr->src_pid;
1749
1750 dst.nid = hdr->dest_nid;
1751 dst.pid = hdr->dest_pid;
1752
1753 CWARN("P3 Header at %p of type %s\n", hdr, type_str);
1754 CWARN(" From %s\n", libcfs_id2str(src));
1755 CWARN(" To %s\n", libcfs_id2str(dst));
1756
1757 switch (hdr->type) {
1758 default:
1759 break;
1760
1761 case LNET_MSG_PUT:
1762 CWARN(" Ptl index %d, ack md %#llx.%#llx, match bits %llu\n",
1763 hdr->msg.put.ptl_index,
1764 hdr->msg.put.ack_wmd.wh_interface_cookie,
1765 hdr->msg.put.ack_wmd.wh_object_cookie,
1766 hdr->msg.put.match_bits);
1767 CWARN(" Length %d, offset %d, hdr data %#llx\n",
1768 hdr->payload_length, hdr->msg.put.offset,
1769 hdr->msg.put.hdr_data);
1770 break;
1771
1772 case LNET_MSG_GET:
1773 CWARN(" Ptl index %d, return md %#llx.%#llx, match bits %llu\n",
1774 hdr->msg.get.ptl_index,
1775 hdr->msg.get.return_wmd.wh_interface_cookie,
1776 hdr->msg.get.return_wmd.wh_object_cookie,
1777 hdr->msg.get.match_bits);
1778 CWARN(" Length %d, src offset %d\n",
1779 hdr->msg.get.sink_length,
1780 hdr->msg.get.src_offset);
1781 break;
1782
1783 case LNET_MSG_ACK:
1784 CWARN(" dst md %#llx.%#llx, manipulated length %d\n",
1785 hdr->msg.ack.dst_wmd.wh_interface_cookie,
1786 hdr->msg.ack.dst_wmd.wh_object_cookie,
1787 hdr->msg.ack.mlength);
1788 break;
1789
1790 case LNET_MSG_REPLY:
1791 CWARN(" dst md %#llx.%#llx, length %d\n",
1792 hdr->msg.reply.dst_wmd.wh_interface_cookie,
1793 hdr->msg.reply.dst_wmd.wh_object_cookie,
1794 hdr->payload_length);
1795 }
1796 }
1797
1798 int
1799 lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid,
1800 void *private, int rdma_req)
1801 {
1802 int rc = 0;
1803 int cpt;
1804 int for_me;
1805 struct lnet_msg *msg;
1806 lnet_pid_t dest_pid;
1807 lnet_nid_t dest_nid;
1808 lnet_nid_t src_nid;
1809 __u32 payload_length;
1810 __u32 type;
1811
1812 LASSERT(!in_interrupt());
1813
1814 type = le32_to_cpu(hdr->type);
1815 src_nid = le64_to_cpu(hdr->src_nid);
1816 dest_nid = le64_to_cpu(hdr->dest_nid);
1817 dest_pid = le32_to_cpu(hdr->dest_pid);
1818 payload_length = le32_to_cpu(hdr->payload_length);
1819
1820 for_me = (ni->ni_nid == dest_nid);
1821 cpt = lnet_cpt_of_nid(from_nid);
1822
1823 switch (type) {
1824 case LNET_MSG_ACK:
1825 case LNET_MSG_GET:
1826 if (payload_length > 0) {
1827 CERROR("%s, src %s: bad %s payload %d (0 expected)\n",
1828 libcfs_nid2str(from_nid),
1829 libcfs_nid2str(src_nid),
1830 lnet_msgtyp2str(type), payload_length);
1831 return -EPROTO;
1832 }
1833 break;
1834
1835 case LNET_MSG_PUT:
1836 case LNET_MSG_REPLY:
1837 if (payload_length >
1838 (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) {
1839 CERROR("%s, src %s: bad %s payload %d (%d max expected)\n",
1840 libcfs_nid2str(from_nid),
1841 libcfs_nid2str(src_nid),
1842 lnet_msgtyp2str(type),
1843 payload_length,
1844 for_me ? LNET_MAX_PAYLOAD : LNET_MTU);
1845 return -EPROTO;
1846 }
1847 break;
1848
1849 default:
1850 CERROR("%s, src %s: Bad message type 0x%x\n",
1851 libcfs_nid2str(from_nid),
1852 libcfs_nid2str(src_nid), type);
1853 return -EPROTO;
1854 }
1855
1856 if (the_lnet.ln_routing &&
1857 ni->ni_last_alive != ktime_get_real_seconds()) {
1858 /* NB: so far here is the only place to set NI status to "up */
1859 lnet_ni_lock(ni);
1860 ni->ni_last_alive = ktime_get_real_seconds();
1861 if (ni->ni_status &&
1862 ni->ni_status->ns_status == LNET_NI_STATUS_DOWN)
1863 ni->ni_status->ns_status = LNET_NI_STATUS_UP;
1864 lnet_ni_unlock(ni);
1865 }
1866
1867 /*
1868 * Regard a bad destination NID as a protocol error. Senders should
1869 * know what they're doing; if they don't they're misconfigured, buggy
1870 * or malicious so we chop them off at the knees :)
1871 */
1872 if (!for_me) {
1873 if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) {
1874 /* should have gone direct */
1875 CERROR("%s, src %s: Bad dest nid %s (should have been sent direct)\n",
1876 libcfs_nid2str(from_nid),
1877 libcfs_nid2str(src_nid),
1878 libcfs_nid2str(dest_nid));
1879 return -EPROTO;
1880 }
1881
1882 if (lnet_islocalnid(dest_nid)) {
1883 /*
1884 * dest is another local NI; sender should have used
1885 * this node's NID on its own network
1886 */
1887 CERROR("%s, src %s: Bad dest nid %s (it's my nid but on a different network)\n",
1888 libcfs_nid2str(from_nid),
1889 libcfs_nid2str(src_nid),
1890 libcfs_nid2str(dest_nid));
1891 return -EPROTO;
1892 }
1893
1894 if (rdma_req && type == LNET_MSG_GET) {
1895 CERROR("%s, src %s: Bad optimized GET for %s (final destination must be me)\n",
1896 libcfs_nid2str(from_nid),
1897 libcfs_nid2str(src_nid),
1898 libcfs_nid2str(dest_nid));
1899 return -EPROTO;
1900 }
1901
1902 if (!the_lnet.ln_routing) {
1903 CERROR("%s, src %s: Dropping message for %s (routing not enabled)\n",
1904 libcfs_nid2str(from_nid),
1905 libcfs_nid2str(src_nid),
1906 libcfs_nid2str(dest_nid));
1907 goto drop;
1908 }
1909 }
1910
1911 /*
1912 * Message looks OK; we're not going to return an error, so we MUST
1913 * call back lnd_recv() come what may...
1914 */
1915 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
1916 fail_peer(src_nid, 0)) { /* shall we now? */
1917 CERROR("%s, src %s: Dropping %s to simulate failure\n",
1918 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1919 lnet_msgtyp2str(type));
1920 goto drop;
1921 }
1922
1923 msg = lnet_msg_alloc();
1924 if (!msg) {
1925 CERROR("%s, src %s: Dropping %s (out of memory)\n",
1926 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1927 lnet_msgtyp2str(type));
1928 goto drop;
1929 }
1930
1931 /* msg zeroed in lnet_msg_alloc;
1932 * i.e. flags all clear, pointers NULL etc
1933 */
1934 msg->msg_type = type;
1935 msg->msg_private = private;
1936 msg->msg_receiving = 1;
1937 msg->msg_wanted = payload_length;
1938 msg->msg_len = payload_length;
1939 msg->msg_offset = 0;
1940 msg->msg_hdr = *hdr;
1941 /* for building message event */
1942 msg->msg_from = from_nid;
1943 if (!for_me) {
1944 msg->msg_target.pid = dest_pid;
1945 msg->msg_target.nid = dest_nid;
1946 msg->msg_routing = 1;
1947
1948 } else {
1949 /* convert common msg->hdr fields to host byteorder */
1950 msg->msg_hdr.type = type;
1951 msg->msg_hdr.src_nid = src_nid;
1952 msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid);
1953 msg->msg_hdr.dest_nid = dest_nid;
1954 msg->msg_hdr.dest_pid = dest_pid;
1955 msg->msg_hdr.payload_length = payload_length;
1956 }
1957
1958 lnet_net_lock(cpt);
1959 rc = lnet_nid2peer_locked(&msg->msg_rxpeer, from_nid, cpt);
1960 if (rc) {
1961 lnet_net_unlock(cpt);
1962 CERROR("%s, src %s: Dropping %s (error %d looking up sender)\n",
1963 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1964 lnet_msgtyp2str(type), rc);
1965 lnet_msg_free(msg);
1966 goto drop;
1967 }
1968
1969 if (lnet_isrouter(msg->msg_rxpeer)) {
1970 lnet_peer_set_alive(msg->msg_rxpeer);
1971 if (avoid_asym_router_failure &&
1972 LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) {
1973 /* received a remote message from router, update
1974 * remote NI status on this router.
1975 * NB: multi-hop routed message will be ignored.
1976 */
1977 lnet_router_ni_update_locked(msg->msg_rxpeer,
1978 LNET_NIDNET(src_nid));
1979 }
1980 }
1981
1982 lnet_msg_commit(msg, cpt);
1983
1984 if (!for_me) {
1985 rc = lnet_parse_forward_locked(ni, msg);
1986 lnet_net_unlock(cpt);
1987
1988 if (rc < 0)
1989 goto free_drop;
1990
1991 if (rc == LNET_CREDIT_OK) {
1992 lnet_ni_recv(ni, msg->msg_private, msg, 0,
1993 0, payload_length, payload_length);
1994 }
1995 return 0;
1996 }
1997
1998 lnet_net_unlock(cpt);
1999
2000 switch (type) {
2001 case LNET_MSG_ACK:
2002 rc = lnet_parse_ack(ni, msg);
2003 break;
2004 case LNET_MSG_PUT:
2005 rc = lnet_parse_put(ni, msg);
2006 break;
2007 case LNET_MSG_GET:
2008 rc = lnet_parse_get(ni, msg, rdma_req);
2009 break;
2010 case LNET_MSG_REPLY:
2011 rc = lnet_parse_reply(ni, msg);
2012 break;
2013 default:
2014 LASSERT(0);
2015 rc = -EPROTO;
2016 goto free_drop; /* prevent an unused label if !kernel */
2017 }
2018
2019 if (!rc)
2020 return 0;
2021
2022 LASSERT(rc == ENOENT);
2023
2024 free_drop:
2025 LASSERT(!msg->msg_md);
2026 lnet_finalize(ni, msg, rc);
2027
2028 drop:
2029 lnet_drop_message(ni, cpt, private, payload_length);
2030 return 0;
2031 }
2032 EXPORT_SYMBOL(lnet_parse);
2033
2034 void
2035 lnet_drop_delayed_msg_list(struct list_head *head, char *reason)
2036 {
2037 while (!list_empty(head)) {
2038 lnet_process_id_t id = {0};
2039 lnet_msg_t *msg;
2040
2041 msg = list_entry(head->next, lnet_msg_t, msg_list);
2042 list_del(&msg->msg_list);
2043
2044 id.nid = msg->msg_hdr.src_nid;
2045 id.pid = msg->msg_hdr.src_pid;
2046
2047 LASSERT(!msg->msg_md);
2048 LASSERT(msg->msg_rx_delayed);
2049 LASSERT(msg->msg_rxpeer);
2050 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
2051
2052 CWARN("Dropping delayed PUT from %s portal %d match %llu offset %d length %d: %s\n",
2053 libcfs_id2str(id),
2054 msg->msg_hdr.msg.put.ptl_index,
2055 msg->msg_hdr.msg.put.match_bits,
2056 msg->msg_hdr.msg.put.offset,
2057 msg->msg_hdr.payload_length, reason);
2058
2059 /*
2060 * NB I can't drop msg's ref on msg_rxpeer until after I've
2061 * called lnet_drop_message(), so I just hang onto msg as well
2062 * until that's done
2063 */
2064 lnet_drop_message(msg->msg_rxpeer->lp_ni,
2065 msg->msg_rxpeer->lp_cpt,
2066 msg->msg_private, msg->msg_len);
2067 /*
2068 * NB: message will not generate event because w/o attached MD,
2069 * but we still should give error code so lnet_msg_decommit()
2070 * can skip counters operations and other checks.
2071 */
2072 lnet_finalize(msg->msg_rxpeer->lp_ni, msg, -ENOENT);
2073 }
2074 }
2075
2076 void
2077 lnet_recv_delayed_msg_list(struct list_head *head)
2078 {
2079 while (!list_empty(head)) {
2080 lnet_msg_t *msg;
2081 lnet_process_id_t id;
2082
2083 msg = list_entry(head->next, lnet_msg_t, msg_list);
2084 list_del(&msg->msg_list);
2085
2086 /*
2087 * md won't disappear under me, since each msg
2088 * holds a ref on it
2089 */
2090 id.nid = msg->msg_hdr.src_nid;
2091 id.pid = msg->msg_hdr.src_pid;
2092
2093 LASSERT(msg->msg_rx_delayed);
2094 LASSERT(msg->msg_md);
2095 LASSERT(msg->msg_rxpeer);
2096 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
2097
2098 CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d match %llu offset %d length %d.\n",
2099 libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index,
2100 msg->msg_hdr.msg.put.match_bits,
2101 msg->msg_hdr.msg.put.offset,
2102 msg->msg_hdr.payload_length);
2103
2104 lnet_recv_put(msg->msg_rxpeer->lp_ni, msg);
2105 }
2106 }
2107
2108 /**
2109 * Initiate an asynchronous PUT operation.
2110 *
2111 * There are several events associated with a PUT: completion of the send on
2112 * the initiator node (LNET_EVENT_SEND), and when the send completes
2113 * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating
2114 * that the operation was accepted by the target. The event LNET_EVENT_PUT is
2115 * used at the target node to indicate the completion of incoming data
2116 * delivery.
2117 *
2118 * The local events will be logged in the EQ associated with the MD pointed to
2119 * by \a mdh handle. Using a MD without an associated EQ results in these
2120 * events being discarded. In this case, the caller must have another
2121 * mechanism (e.g., a higher level protocol) for determining when it is safe
2122 * to modify the memory region associated with the MD.
2123 *
2124 * Note that LNet does not guarantee the order of LNET_EVENT_SEND and
2125 * LNET_EVENT_ACK, though intuitively ACK should happen after SEND.
2126 *
2127 * \param self Indicates the NID of a local interface through which to send
2128 * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself.
2129 * \param mdh A handle for the MD that describes the memory to be sent. The MD
2130 * must be "free floating" (See LNetMDBind()).
2131 * \param ack Controls whether an acknowledgment is requested.
2132 * Acknowledgments are only sent when they are requested by the initiating
2133 * process and the target MD enables them.
2134 * \param target A process identifier for the target process.
2135 * \param portal The index in the \a target's portal table.
2136 * \param match_bits The match bits to use for MD selection at the target
2137 * process.
2138 * \param offset The offset into the target MD (only used when the target
2139 * MD has the LNET_MD_MANAGE_REMOTE option set).
2140 * \param hdr_data 64 bits of user data that can be included in the message
2141 * header. This data is written to an event queue entry at the target if an
2142 * EQ is present on the matching MD.
2143 *
2144 * \retval 0 Success, and only in this case events will be generated
2145 * and logged to EQ (if it exists).
2146 * \retval -EIO Simulated failure.
2147 * \retval -ENOMEM Memory allocation failure.
2148 * \retval -ENOENT Invalid MD object.
2149 *
2150 * \see lnet_event_t::hdr_data and lnet_event_kind_t.
2151 */
2152 int
2153 LNetPut(lnet_nid_t self, lnet_handle_md_t mdh, lnet_ack_req_t ack,
2154 lnet_process_id_t target, unsigned int portal,
2155 __u64 match_bits, unsigned int offset,
2156 __u64 hdr_data)
2157 {
2158 struct lnet_msg *msg;
2159 struct lnet_libmd *md;
2160 int cpt;
2161 int rc;
2162
2163 LASSERT(the_lnet.ln_refcount > 0);
2164
2165 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
2166 fail_peer(target.nid, 1)) { /* shall we now? */
2167 CERROR("Dropping PUT to %s: simulated failure\n",
2168 libcfs_id2str(target));
2169 return -EIO;
2170 }
2171
2172 msg = lnet_msg_alloc();
2173 if (!msg) {
2174 CERROR("Dropping PUT to %s: ENOMEM on lnet_msg_t\n",
2175 libcfs_id2str(target));
2176 return -ENOMEM;
2177 }
2178 msg->msg_vmflush = !!memory_pressure_get();
2179
2180 cpt = lnet_cpt_of_cookie(mdh.cookie);
2181 lnet_res_lock(cpt);
2182
2183 md = lnet_handle2md(&mdh);
2184 if (!md || !md->md_threshold || md->md_me) {
2185 CERROR("Dropping PUT (%llu:%d:%s): MD (%d) invalid\n",
2186 match_bits, portal, libcfs_id2str(target),
2187 !md ? -1 : md->md_threshold);
2188 if (md && md->md_me)
2189 CERROR("Source MD also attached to portal %d\n",
2190 md->md_me->me_portal);
2191 lnet_res_unlock(cpt);
2192
2193 lnet_msg_free(msg);
2194 return -ENOENT;
2195 }
2196
2197 CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target));
2198
2199 lnet_msg_attach_md(msg, md, 0, 0);
2200
2201 lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length);
2202
2203 msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits);
2204 msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal);
2205 msg->msg_hdr.msg.put.offset = cpu_to_le32(offset);
2206 msg->msg_hdr.msg.put.hdr_data = hdr_data;
2207
2208 /* NB handles only looked up by creator (no flips) */
2209 if (ack == LNET_ACK_REQ) {
2210 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2211 the_lnet.ln_interface_cookie;
2212 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2213 md->md_lh.lh_cookie;
2214 } else {
2215 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2216 LNET_WIRE_HANDLE_COOKIE_NONE;
2217 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2218 LNET_WIRE_HANDLE_COOKIE_NONE;
2219 }
2220
2221 lnet_res_unlock(cpt);
2222
2223 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2224
2225 rc = lnet_send(self, msg, LNET_NID_ANY);
2226 if (rc) {
2227 CNETERR("Error sending PUT to %s: %d\n",
2228 libcfs_id2str(target), rc);
2229 lnet_finalize(NULL, msg, rc);
2230 }
2231
2232 /* completion will be signalled by an event */
2233 return 0;
2234 }
2235 EXPORT_SYMBOL(LNetPut);
2236
2237 lnet_msg_t *
2238 lnet_create_reply_msg(lnet_ni_t *ni, lnet_msg_t *getmsg)
2239 {
2240 /*
2241 * The LND can DMA direct to the GET md (i.e. no REPLY msg). This
2242 * returns a msg for the LND to pass to lnet_finalize() when the sink
2243 * data has been received.
2244 *
2245 * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when
2246 * lnet_finalize() is called on it, so the LND must call this first
2247 */
2248 struct lnet_msg *msg = lnet_msg_alloc();
2249 struct lnet_libmd *getmd = getmsg->msg_md;
2250 lnet_process_id_t peer_id = getmsg->msg_target;
2251 int cpt;
2252
2253 LASSERT(!getmsg->msg_target_is_router);
2254 LASSERT(!getmsg->msg_routing);
2255
2256 if (!msg) {
2257 CERROR("%s: Dropping REPLY from %s: can't allocate msg\n",
2258 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
2259 goto drop;
2260 }
2261
2262 cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
2263 lnet_res_lock(cpt);
2264
2265 LASSERT(getmd->md_refcount > 0);
2266
2267 if (!getmd->md_threshold) {
2268 CERROR("%s: Dropping REPLY from %s for inactive MD %p\n",
2269 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),
2270 getmd);
2271 lnet_res_unlock(cpt);
2272 goto drop;
2273 }
2274
2275 LASSERT(!getmd->md_offset);
2276
2277 CDEBUG(D_NET, "%s: Reply from %s md %p\n",
2278 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
2279
2280 /* setup information for lnet_build_msg_event */
2281 msg->msg_from = peer_id.nid;
2282 msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
2283 msg->msg_hdr.src_nid = peer_id.nid;
2284 msg->msg_hdr.payload_length = getmd->md_length;
2285 msg->msg_receiving = 1; /* required by lnet_msg_attach_md */
2286
2287 lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length);
2288 lnet_res_unlock(cpt);
2289
2290 cpt = lnet_cpt_of_nid(peer_id.nid);
2291
2292 lnet_net_lock(cpt);
2293 lnet_msg_commit(msg, cpt);
2294 lnet_net_unlock(cpt);
2295
2296 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
2297
2298 return msg;
2299
2300 drop:
2301 cpt = lnet_cpt_of_nid(peer_id.nid);
2302
2303 lnet_net_lock(cpt);
2304 the_lnet.ln_counters[cpt]->drop_count++;
2305 the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
2306 lnet_net_unlock(cpt);
2307
2308 if (msg)
2309 lnet_msg_free(msg);
2310
2311 return NULL;
2312 }
2313 EXPORT_SYMBOL(lnet_create_reply_msg);
2314
2315 void
2316 lnet_set_reply_msg_len(lnet_ni_t *ni, lnet_msg_t *reply, unsigned int len)
2317 {
2318 /*
2319 * Set the REPLY length, now the RDMA that elides the REPLY message has
2320 * completed and I know it.
2321 */
2322 LASSERT(reply);
2323 LASSERT(reply->msg_type == LNET_MSG_GET);
2324 LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY);
2325
2326 /*
2327 * NB I trusted my peer to RDMA. If she tells me she's written beyond
2328 * the end of my buffer, I might as well be dead.
2329 */
2330 LASSERT(len <= reply->msg_ev.mlength);
2331
2332 reply->msg_ev.mlength = len;
2333 }
2334 EXPORT_SYMBOL(lnet_set_reply_msg_len);
2335
2336 /**
2337 * Initiate an asynchronous GET operation.
2338 *
2339 * On the initiator node, an LNET_EVENT_SEND is logged when the GET request
2340 * is sent, and an LNET_EVENT_REPLY is logged when the data returned from
2341 * the target node in the REPLY has been written to local MD.
2342 *
2343 * On the target node, an LNET_EVENT_GET is logged when the GET request
2344 * arrives and is accepted into a MD.
2345 *
2346 * \param self,target,portal,match_bits,offset See the discussion in LNetPut().
2347 * \param mdh A handle for the MD that describes the memory into which the
2348 * requested data will be received. The MD must be "free floating"
2349 * (See LNetMDBind()).
2350 *
2351 * \retval 0 Success, and only in this case events will be generated
2352 * and logged to EQ (if it exists) of the MD.
2353 * \retval -EIO Simulated failure.
2354 * \retval -ENOMEM Memory allocation failure.
2355 * \retval -ENOENT Invalid MD object.
2356 */
2357 int
2358 LNetGet(lnet_nid_t self, lnet_handle_md_t mdh,
2359 lnet_process_id_t target, unsigned int portal,
2360 __u64 match_bits, unsigned int offset)
2361 {
2362 struct lnet_msg *msg;
2363 struct lnet_libmd *md;
2364 int cpt;
2365 int rc;
2366
2367 LASSERT(the_lnet.ln_refcount > 0);
2368
2369 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
2370 fail_peer(target.nid, 1)) { /* shall we now? */
2371 CERROR("Dropping GET to %s: simulated failure\n",
2372 libcfs_id2str(target));
2373 return -EIO;
2374 }
2375
2376 msg = lnet_msg_alloc();
2377 if (!msg) {
2378 CERROR("Dropping GET to %s: ENOMEM on lnet_msg_t\n",
2379 libcfs_id2str(target));
2380 return -ENOMEM;
2381 }
2382
2383 cpt = lnet_cpt_of_cookie(mdh.cookie);
2384 lnet_res_lock(cpt);
2385
2386 md = lnet_handle2md(&mdh);
2387 if (!md || !md->md_threshold || md->md_me) {
2388 CERROR("Dropping GET (%llu:%d:%s): MD (%d) invalid\n",
2389 match_bits, portal, libcfs_id2str(target),
2390 !md ? -1 : md->md_threshold);
2391 if (md && md->md_me)
2392 CERROR("REPLY MD also attached to portal %d\n",
2393 md->md_me->me_portal);
2394
2395 lnet_res_unlock(cpt);
2396
2397 lnet_msg_free(msg);
2398 return -ENOENT;
2399 }
2400
2401 CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target));
2402
2403 lnet_msg_attach_md(msg, md, 0, 0);
2404
2405 lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0);
2406
2407 msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits);
2408 msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal);
2409 msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset);
2410 msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length);
2411
2412 /* NB handles only looked up by creator (no flips) */
2413 msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie =
2414 the_lnet.ln_interface_cookie;
2415 msg->msg_hdr.msg.get.return_wmd.wh_object_cookie =
2416 md->md_lh.lh_cookie;
2417
2418 lnet_res_unlock(cpt);
2419
2420 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2421
2422 rc = lnet_send(self, msg, LNET_NID_ANY);
2423 if (rc < 0) {
2424 CNETERR("Error sending GET to %s: %d\n",
2425 libcfs_id2str(target), rc);
2426 lnet_finalize(NULL, msg, rc);
2427 }
2428
2429 /* completion will be signalled by an event */
2430 return 0;
2431 }
2432 EXPORT_SYMBOL(LNetGet);
2433
2434 /**
2435 * Calculate distance to node at \a dstnid.
2436 *
2437 * \param dstnid Target NID.
2438 * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid
2439 * is saved here.
2440 * \param orderp If not NULL, order of the route to reach \a dstnid is saved
2441 * here.
2442 *
2443 * \retval 0 If \a dstnid belongs to a local interface, and reserved option
2444 * local_nid_dist_zero is set, which is the default.
2445 * \retval positives Distance to target NID, i.e. number of hops plus one.
2446 * \retval -EHOSTUNREACH If \a dstnid is not reachable.
2447 */
2448 int
2449 LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp)
2450 {
2451 struct list_head *e;
2452 struct lnet_ni *ni;
2453 lnet_remotenet_t *rnet;
2454 __u32 dstnet = LNET_NIDNET(dstnid);
2455 int hops;
2456 int cpt;
2457 __u32 order = 2;
2458 struct list_head *rn_list;
2459
2460 /*
2461 * if !local_nid_dist_zero, I don't return a distance of 0 ever
2462 * (when lustre sees a distance of 0, it substitutes 0@lo), so I
2463 * keep order 0 free for 0@lo and order 1 free for a local NID
2464 * match
2465 */
2466 LASSERT(the_lnet.ln_refcount > 0);
2467
2468 cpt = lnet_net_lock_current();
2469
2470 list_for_each(e, &the_lnet.ln_nis) {
2471 ni = list_entry(e, lnet_ni_t, ni_list);
2472
2473 if (ni->ni_nid == dstnid) {
2474 if (srcnidp)
2475 *srcnidp = dstnid;
2476 if (orderp) {
2477 if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND)
2478 *orderp = 0;
2479 else
2480 *orderp = 1;
2481 }
2482 lnet_net_unlock(cpt);
2483
2484 return local_nid_dist_zero ? 0 : 1;
2485 }
2486
2487 if (LNET_NIDNET(ni->ni_nid) == dstnet) {
2488 if (srcnidp)
2489 *srcnidp = ni->ni_nid;
2490 if (orderp)
2491 *orderp = order;
2492 lnet_net_unlock(cpt);
2493 return 1;
2494 }
2495
2496 order++;
2497 }
2498
2499 rn_list = lnet_net2rnethash(dstnet);
2500 list_for_each(e, rn_list) {
2501 rnet = list_entry(e, lnet_remotenet_t, lrn_list);
2502
2503 if (rnet->lrn_net == dstnet) {
2504 lnet_route_t *route;
2505 lnet_route_t *shortest = NULL;
2506
2507 LASSERT(!list_empty(&rnet->lrn_routes));
2508
2509 list_for_each_entry(route, &rnet->lrn_routes,
2510 lr_list) {
2511 if (!shortest ||
2512 route->lr_hops < shortest->lr_hops)
2513 shortest = route;
2514 }
2515
2516 LASSERT(shortest);
2517 hops = shortest->lr_hops;
2518 if (srcnidp)
2519 *srcnidp = shortest->lr_gateway->lp_ni->ni_nid;
2520 if (orderp)
2521 *orderp = order;
2522 lnet_net_unlock(cpt);
2523 return hops + 1;
2524 }
2525 order++;
2526 }
2527
2528 lnet_net_unlock(cpt);
2529 return -EHOSTUNREACH;
2530 }
2531 EXPORT_SYMBOL(LNetDist);
Linux kernel - Deliverables
This page took 0.117002 seconds and 4 git commands to generate.