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d7e09d03 PT |
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 | * | |
1dc563a6 | 30 | * Copyright (c) 2011, 2015, Intel Corporation. |
d7e09d03 PT |
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 | ||
9fdaf8c0 | 43 | #include "../../include/linux/lnet/lib-lnet.h" |
d7e09d03 | 44 | |
ec5fb5be LZ |
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 | ||
d7e09d03 | 50 | static int local_nid_dist_zero = 1; |
8cc7b4b9 PT |
51 | module_param(local_nid_dist_zero, int, 0444); |
52 | MODULE_PARM_DESC(local_nid_dist_zero, "Reserved"); | |
d7e09d03 PT |
53 | |
54 | int | |
af66a6e2 | 55 | lnet_fail_nid(lnet_nid_t nid, unsigned int threshold) |
d7e09d03 | 56 | { |
7e7ab095 MS |
57 | lnet_test_peer_t *tp; |
58 | struct list_head *el; | |
59 | struct list_head *next; | |
60 | struct list_head cull; | |
d7e09d03 | 61 | |
af66a6e2 | 62 | LASSERT(the_lnet.ln_init); |
d7e09d03 PT |
63 | |
64 | /* NB: use lnet_net_lock(0) to serialize operations on test peers */ | |
5fd88337 | 65 | if (threshold) { |
d7e09d03 PT |
66 | /* Adding a new entry */ |
67 | LIBCFS_ALLOC(tp, sizeof(*tp)); | |
06ace26e | 68 | if (!tp) |
d7e09d03 PT |
69 | return -ENOMEM; |
70 | ||
71 | tp->tp_nid = nid; | |
72 | tp->tp_threshold = threshold; | |
73 | ||
74 | lnet_net_lock(0); | |
75 | list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers); | |
76 | lnet_net_unlock(0); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /* removing entries */ | |
81 | INIT_LIST_HEAD(&cull); | |
82 | ||
83 | lnet_net_lock(0); | |
84 | ||
af66a6e2 LN |
85 | list_for_each_safe(el, next, &the_lnet.ln_test_peers) { |
86 | tp = list_entry(el, lnet_test_peer_t, tp_list); | |
d7e09d03 | 87 | |
5fd88337 | 88 | if (!tp->tp_threshold || /* needs culling anyway */ |
d7e09d03 | 89 | nid == LNET_NID_ANY || /* removing all entries */ |
9b79ca85 | 90 | tp->tp_nid == nid) { /* matched this one */ |
af66a6e2 LN |
91 | list_del(&tp->tp_list); |
92 | list_add(&tp->tp_list, &cull); | |
d7e09d03 PT |
93 | } |
94 | } | |
95 | ||
96 | lnet_net_unlock(0); | |
97 | ||
af66a6e2 LN |
98 | while (!list_empty(&cull)) { |
99 | tp = list_entry(cull.next, lnet_test_peer_t, tp_list); | |
d7e09d03 | 100 | |
af66a6e2 LN |
101 | list_del(&tp->tp_list); |
102 | LIBCFS_FREE(tp, sizeof(*tp)); | |
d7e09d03 PT |
103 | } |
104 | return 0; | |
105 | } | |
106 | ||
107 | static int | |
af66a6e2 | 108 | fail_peer(lnet_nid_t nid, int outgoing) |
d7e09d03 PT |
109 | { |
110 | lnet_test_peer_t *tp; | |
7e7ab095 MS |
111 | struct list_head *el; |
112 | struct list_head *next; | |
113 | struct list_head cull; | |
114 | int fail = 0; | |
d7e09d03 | 115 | |
af66a6e2 | 116 | INIT_LIST_HEAD(&cull); |
d7e09d03 PT |
117 | |
118 | /* NB: use lnet_net_lock(0) to serialize operations on test peers */ | |
119 | lnet_net_lock(0); | |
120 | ||
af66a6e2 LN |
121 | list_for_each_safe(el, next, &the_lnet.ln_test_peers) { |
122 | tp = list_entry(el, lnet_test_peer_t, tp_list); | |
d7e09d03 | 123 | |
5fd88337 | 124 | if (!tp->tp_threshold) { |
d7e09d03 PT |
125 | /* zombie entry */ |
126 | if (outgoing) { | |
4420cfd3 JS |
127 | /* |
128 | * only cull zombies on outgoing tests, | |
d7e09d03 | 129 | * since we may be at interrupt priority on |
4420cfd3 JS |
130 | * incoming messages. |
131 | */ | |
af66a6e2 LN |
132 | list_del(&tp->tp_list); |
133 | list_add(&tp->tp_list, &cull); | |
d7e09d03 PT |
134 | } |
135 | continue; | |
136 | } | |
137 | ||
138 | if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */ | |
139 | nid == tp->tp_nid) { /* fail this peer */ | |
140 | fail = 1; | |
141 | ||
142 | if (tp->tp_threshold != LNET_MD_THRESH_INF) { | |
143 | tp->tp_threshold--; | |
144 | if (outgoing && | |
5fd88337 | 145 | !tp->tp_threshold) { |
d7e09d03 | 146 | /* see above */ |
af66a6e2 LN |
147 | list_del(&tp->tp_list); |
148 | list_add(&tp->tp_list, &cull); | |
d7e09d03 PT |
149 | } |
150 | } | |
151 | break; | |
152 | } | |
153 | } | |
154 | ||
155 | lnet_net_unlock(0); | |
156 | ||
af66a6e2 LN |
157 | while (!list_empty(&cull)) { |
158 | tp = list_entry(cull.next, lnet_test_peer_t, tp_list); | |
159 | list_del(&tp->tp_list); | |
d7e09d03 | 160 | |
af66a6e2 | 161 | LIBCFS_FREE(tp, sizeof(*tp)); |
d7e09d03 PT |
162 | } |
163 | ||
2b5f2e44 | 164 | return fail; |
d7e09d03 PT |
165 | } |
166 | ||
167 | unsigned int | |
f351bad2 | 168 | lnet_iov_nob(unsigned int niov, struct kvec *iov) |
d7e09d03 PT |
169 | { |
170 | unsigned int nob = 0; | |
171 | ||
172 | while (niov-- > 0) | |
173 | nob += (iov++)->iov_len; | |
174 | ||
2b5f2e44 | 175 | return nob; |
d7e09d03 PT |
176 | } |
177 | EXPORT_SYMBOL(lnet_iov_nob); | |
178 | ||
179 | void | |
f351bad2 | 180 | lnet_copy_iov2iov(unsigned int ndiov, struct kvec *diov, unsigned int doffset, |
c314c319 JS |
181 | unsigned int nsiov, struct kvec *siov, unsigned int soffset, |
182 | unsigned int nob) | |
d7e09d03 PT |
183 | { |
184 | /* NB diov, siov are READ-ONLY */ | |
7e7ab095 | 185 | unsigned int this_nob; |
d7e09d03 | 186 | |
5fd88337 | 187 | if (!nob) |
d7e09d03 PT |
188 | return; |
189 | ||
190 | /* skip complete frags before 'doffset' */ | |
af66a6e2 | 191 | LASSERT(ndiov > 0); |
d7e09d03 PT |
192 | while (doffset >= diov->iov_len) { |
193 | doffset -= diov->iov_len; | |
194 | diov++; | |
195 | ndiov--; | |
af66a6e2 | 196 | LASSERT(ndiov > 0); |
d7e09d03 PT |
197 | } |
198 | ||
199 | /* skip complete frags before 'soffset' */ | |
af66a6e2 | 200 | LASSERT(nsiov > 0); |
d7e09d03 PT |
201 | while (soffset >= siov->iov_len) { |
202 | soffset -= siov->iov_len; | |
203 | siov++; | |
204 | nsiov--; | |
af66a6e2 | 205 | LASSERT(nsiov > 0); |
d7e09d03 PT |
206 | } |
207 | ||
208 | do { | |
af66a6e2 LN |
209 | LASSERT(ndiov > 0); |
210 | LASSERT(nsiov > 0); | |
0c575417 | 211 | this_nob = min(diov->iov_len - doffset, |
d7e09d03 | 212 | siov->iov_len - soffset); |
0c575417 | 213 | this_nob = min(this_nob, nob); |
d7e09d03 | 214 | |
af66a6e2 | 215 | memcpy((char *)diov->iov_base + doffset, |
c314c319 | 216 | (char *)siov->iov_base + soffset, this_nob); |
d7e09d03 PT |
217 | nob -= this_nob; |
218 | ||
219 | if (diov->iov_len > doffset + this_nob) { | |
220 | doffset += this_nob; | |
221 | } else { | |
222 | diov++; | |
223 | ndiov--; | |
224 | doffset = 0; | |
225 | } | |
226 | ||
227 | if (siov->iov_len > soffset + this_nob) { | |
228 | soffset += this_nob; | |
229 | } else { | |
230 | siov++; | |
231 | nsiov--; | |
232 | soffset = 0; | |
233 | } | |
234 | } while (nob > 0); | |
235 | } | |
236 | EXPORT_SYMBOL(lnet_copy_iov2iov); | |
237 | ||
238 | int | |
f351bad2 | 239 | lnet_extract_iov(int dst_niov, struct kvec *dst, |
c314c319 JS |
240 | int src_niov, struct kvec *src, |
241 | unsigned int offset, unsigned int len) | |
d7e09d03 | 242 | { |
4420cfd3 JS |
243 | /* |
244 | * Initialise 'dst' to the subset of 'src' starting at 'offset', | |
d7e09d03 | 245 | * for exactly 'len' bytes, and return the number of entries. |
4420cfd3 JS |
246 | * NB not destructive to 'src' |
247 | */ | |
7e7ab095 MS |
248 | unsigned int frag_len; |
249 | unsigned int niov; | |
d7e09d03 | 250 | |
5fd88337 | 251 | if (!len) /* no data => */ |
2b5f2e44 | 252 | return 0; /* no frags */ |
d7e09d03 | 253 | |
af66a6e2 | 254 | LASSERT(src_niov > 0); |
d7e09d03 PT |
255 | while (offset >= src->iov_len) { /* skip initial frags */ |
256 | offset -= src->iov_len; | |
257 | src_niov--; | |
258 | src++; | |
af66a6e2 | 259 | LASSERT(src_niov > 0); |
d7e09d03 PT |
260 | } |
261 | ||
262 | niov = 1; | |
263 | for (;;) { | |
af66a6e2 LN |
264 | LASSERT(src_niov > 0); |
265 | LASSERT((int)niov <= dst_niov); | |
d7e09d03 PT |
266 | |
267 | frag_len = src->iov_len - offset; | |
268 | dst->iov_base = ((char *)src->iov_base) + offset; | |
269 | ||
270 | if (len <= frag_len) { | |
271 | dst->iov_len = len; | |
2b5f2e44 | 272 | return niov; |
d7e09d03 PT |
273 | } |
274 | ||
275 | dst->iov_len = frag_len; | |
276 | ||
277 | len -= frag_len; | |
278 | dst++; | |
279 | src++; | |
280 | niov++; | |
281 | src_niov--; | |
282 | offset = 0; | |
283 | } | |
284 | } | |
285 | EXPORT_SYMBOL(lnet_extract_iov); | |
286 | ||
d7e09d03 | 287 | unsigned int |
af66a6e2 | 288 | lnet_kiov_nob(unsigned int niov, lnet_kiov_t *kiov) |
d7e09d03 | 289 | { |
7e7ab095 | 290 | unsigned int nob = 0; |
d7e09d03 PT |
291 | |
292 | while (niov-- > 0) | |
293 | nob += (kiov++)->kiov_len; | |
294 | ||
2b5f2e44 | 295 | return nob; |
d7e09d03 PT |
296 | } |
297 | EXPORT_SYMBOL(lnet_kiov_nob); | |
298 | ||
299 | void | |
af66a6e2 | 300 | lnet_copy_kiov2kiov(unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset, |
ae4003f0 LN |
301 | unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset, |
302 | unsigned int nob) | |
d7e09d03 PT |
303 | { |
304 | /* NB diov, siov are READ-ONLY */ | |
7e7ab095 MS |
305 | unsigned int this_nob; |
306 | char *daddr = NULL; | |
307 | char *saddr = NULL; | |
d7e09d03 | 308 | |
5fd88337 | 309 | if (!nob) |
d7e09d03 PT |
310 | return; |
311 | ||
af66a6e2 | 312 | LASSERT(!in_interrupt()); |
d7e09d03 | 313 | |
af66a6e2 | 314 | LASSERT(ndiov > 0); |
d7e09d03 PT |
315 | while (doffset >= diov->kiov_len) { |
316 | doffset -= diov->kiov_len; | |
317 | diov++; | |
318 | ndiov--; | |
af66a6e2 | 319 | LASSERT(ndiov > 0); |
d7e09d03 PT |
320 | } |
321 | ||
af66a6e2 | 322 | LASSERT(nsiov > 0); |
d7e09d03 PT |
323 | while (soffset >= siov->kiov_len) { |
324 | soffset -= siov->kiov_len; | |
325 | siov++; | |
326 | nsiov--; | |
af66a6e2 | 327 | LASSERT(nsiov > 0); |
d7e09d03 PT |
328 | } |
329 | ||
330 | do { | |
af66a6e2 LN |
331 | LASSERT(ndiov > 0); |
332 | LASSERT(nsiov > 0); | |
0c575417 | 333 | this_nob = min(diov->kiov_len - doffset, |
d7e09d03 | 334 | siov->kiov_len - soffset); |
0c575417 | 335 | this_nob = min(this_nob, nob); |
d7e09d03 | 336 | |
06ace26e | 337 | if (!daddr) |
d7e09d03 PT |
338 | daddr = ((char *)kmap(diov->kiov_page)) + |
339 | diov->kiov_offset + doffset; | |
06ace26e | 340 | if (!saddr) |
d7e09d03 PT |
341 | saddr = ((char *)kmap(siov->kiov_page)) + |
342 | siov->kiov_offset + soffset; | |
343 | ||
4420cfd3 JS |
344 | /* |
345 | * Vanishing risk of kmap deadlock when mapping 2 pages. | |
d7e09d03 | 346 | * However in practice at least one of the kiovs will be mapped |
4420cfd3 JS |
347 | * kernel pages and the map/unmap will be NOOPs |
348 | */ | |
af66a6e2 | 349 | memcpy(daddr, saddr, this_nob); |
d7e09d03 PT |
350 | nob -= this_nob; |
351 | ||
352 | if (diov->kiov_len > doffset + this_nob) { | |
353 | daddr += this_nob; | |
354 | doffset += this_nob; | |
355 | } else { | |
356 | kunmap(diov->kiov_page); | |
357 | daddr = NULL; | |
358 | diov++; | |
359 | ndiov--; | |
360 | doffset = 0; | |
361 | } | |
362 | ||
363 | if (siov->kiov_len > soffset + this_nob) { | |
364 | saddr += this_nob; | |
365 | soffset += this_nob; | |
366 | } else { | |
367 | kunmap(siov->kiov_page); | |
368 | saddr = NULL; | |
369 | siov++; | |
370 | nsiov--; | |
371 | soffset = 0; | |
372 | } | |
373 | } while (nob > 0); | |
374 | ||
06ace26e | 375 | if (daddr) |
d7e09d03 | 376 | kunmap(diov->kiov_page); |
06ace26e | 377 | if (saddr) |
d7e09d03 PT |
378 | kunmap(siov->kiov_page); |
379 | } | |
380 | EXPORT_SYMBOL(lnet_copy_kiov2kiov); | |
381 | ||
382 | void | |
f351bad2 | 383 | lnet_copy_kiov2iov(unsigned int niov, struct kvec *iov, unsigned int iovoffset, |
ae4003f0 LN |
384 | unsigned int nkiov, lnet_kiov_t *kiov, |
385 | unsigned int kiovoffset, unsigned int nob) | |
d7e09d03 PT |
386 | { |
387 | /* NB iov, kiov are READ-ONLY */ | |
7e7ab095 MS |
388 | unsigned int this_nob; |
389 | char *addr = NULL; | |
d7e09d03 | 390 | |
5fd88337 | 391 | if (!nob) |
d7e09d03 PT |
392 | return; |
393 | ||
af66a6e2 | 394 | LASSERT(!in_interrupt()); |
d7e09d03 | 395 | |
af66a6e2 | 396 | LASSERT(niov > 0); |
d7e09d03 PT |
397 | while (iovoffset >= iov->iov_len) { |
398 | iovoffset -= iov->iov_len; | |
399 | iov++; | |
400 | niov--; | |
af66a6e2 | 401 | LASSERT(niov > 0); |
d7e09d03 PT |
402 | } |
403 | ||
af66a6e2 | 404 | LASSERT(nkiov > 0); |
d7e09d03 PT |
405 | while (kiovoffset >= kiov->kiov_len) { |
406 | kiovoffset -= kiov->kiov_len; | |
407 | kiov++; | |
408 | nkiov--; | |
af66a6e2 | 409 | LASSERT(nkiov > 0); |
d7e09d03 PT |
410 | } |
411 | ||
412 | do { | |
af66a6e2 LN |
413 | LASSERT(niov > 0); |
414 | LASSERT(nkiov > 0); | |
fce6ad22 JM |
415 | this_nob = min(iov->iov_len - iovoffset, |
416 | (__kernel_size_t) kiov->kiov_len - kiovoffset); | |
0c575417 | 417 | this_nob = min(this_nob, nob); |
d7e09d03 | 418 | |
06ace26e | 419 | if (!addr) |
d7e09d03 PT |
420 | addr = ((char *)kmap(kiov->kiov_page)) + |
421 | kiov->kiov_offset + kiovoffset; | |
422 | ||
af66a6e2 | 423 | memcpy((char *)iov->iov_base + iovoffset, addr, this_nob); |
d7e09d03 PT |
424 | nob -= this_nob; |
425 | ||
426 | if (iov->iov_len > iovoffset + this_nob) { | |
427 | iovoffset += this_nob; | |
428 | } else { | |
429 | iov++; | |
430 | niov--; | |
431 | iovoffset = 0; | |
432 | } | |
433 | ||
434 | if (kiov->kiov_len > kiovoffset + this_nob) { | |
435 | addr += this_nob; | |
436 | kiovoffset += this_nob; | |
437 | } else { | |
438 | kunmap(kiov->kiov_page); | |
439 | addr = NULL; | |
440 | kiov++; | |
441 | nkiov--; | |
442 | kiovoffset = 0; | |
443 | } | |
444 | ||
445 | } while (nob > 0); | |
446 | ||
06ace26e | 447 | if (addr) |
d7e09d03 PT |
448 | kunmap(kiov->kiov_page); |
449 | } | |
450 | EXPORT_SYMBOL(lnet_copy_kiov2iov); | |
451 | ||
452 | void | |
ae4003f0 LN |
453 | lnet_copy_iov2kiov(unsigned int nkiov, lnet_kiov_t *kiov, |
454 | unsigned int kiovoffset, unsigned int niov, | |
f351bad2 | 455 | struct kvec *iov, unsigned int iovoffset, |
ae4003f0 | 456 | unsigned int nob) |
d7e09d03 PT |
457 | { |
458 | /* NB kiov, iov are READ-ONLY */ | |
7e7ab095 MS |
459 | unsigned int this_nob; |
460 | char *addr = NULL; | |
d7e09d03 | 461 | |
5fd88337 | 462 | if (!nob) |
d7e09d03 PT |
463 | return; |
464 | ||
af66a6e2 | 465 | LASSERT(!in_interrupt()); |
d7e09d03 | 466 | |
af66a6e2 | 467 | LASSERT(nkiov > 0); |
d7e09d03 PT |
468 | while (kiovoffset >= kiov->kiov_len) { |
469 | kiovoffset -= kiov->kiov_len; | |
470 | kiov++; | |
471 | nkiov--; | |
af66a6e2 | 472 | LASSERT(nkiov > 0); |
d7e09d03 PT |
473 | } |
474 | ||
af66a6e2 | 475 | LASSERT(niov > 0); |
d7e09d03 PT |
476 | while (iovoffset >= iov->iov_len) { |
477 | iovoffset -= iov->iov_len; | |
478 | iov++; | |
479 | niov--; | |
af66a6e2 | 480 | LASSERT(niov > 0); |
d7e09d03 PT |
481 | } |
482 | ||
483 | do { | |
af66a6e2 LN |
484 | LASSERT(nkiov > 0); |
485 | LASSERT(niov > 0); | |
fce6ad22 | 486 | this_nob = min((__kernel_size_t) kiov->kiov_len - kiovoffset, |
d7e09d03 | 487 | iov->iov_len - iovoffset); |
0c575417 | 488 | this_nob = min(this_nob, nob); |
d7e09d03 | 489 | |
06ace26e | 490 | if (!addr) |
d7e09d03 PT |
491 | addr = ((char *)kmap(kiov->kiov_page)) + |
492 | kiov->kiov_offset + kiovoffset; | |
493 | ||
af66a6e2 | 494 | memcpy(addr, (char *)iov->iov_base + iovoffset, this_nob); |
d7e09d03 PT |
495 | nob -= this_nob; |
496 | ||
497 | if (kiov->kiov_len > kiovoffset + this_nob) { | |
498 | addr += this_nob; | |
499 | kiovoffset += this_nob; | |
500 | } else { | |
501 | kunmap(kiov->kiov_page); | |
502 | addr = NULL; | |
503 | kiov++; | |
504 | nkiov--; | |
505 | kiovoffset = 0; | |
506 | } | |
507 | ||
508 | if (iov->iov_len > iovoffset + this_nob) { | |
509 | iovoffset += this_nob; | |
510 | } else { | |
511 | iov++; | |
512 | niov--; | |
513 | iovoffset = 0; | |
514 | } | |
515 | } while (nob > 0); | |
516 | ||
06ace26e | 517 | if (addr) |
d7e09d03 PT |
518 | kunmap(kiov->kiov_page); |
519 | } | |
520 | EXPORT_SYMBOL(lnet_copy_iov2kiov); | |
521 | ||
522 | int | |
af66a6e2 | 523 | lnet_extract_kiov(int dst_niov, lnet_kiov_t *dst, |
c314c319 JS |
524 | int src_niov, lnet_kiov_t *src, |
525 | unsigned int offset, unsigned int len) | |
d7e09d03 | 526 | { |
4420cfd3 JS |
527 | /* |
528 | * Initialise 'dst' to the subset of 'src' starting at 'offset', | |
d7e09d03 | 529 | * for exactly 'len' bytes, and return the number of entries. |
4420cfd3 JS |
530 | * NB not destructive to 'src' |
531 | */ | |
7e7ab095 MS |
532 | unsigned int frag_len; |
533 | unsigned int niov; | |
d7e09d03 | 534 | |
5fd88337 | 535 | if (!len) /* no data => */ |
2b5f2e44 | 536 | return 0; /* no frags */ |
d7e09d03 | 537 | |
af66a6e2 | 538 | LASSERT(src_niov > 0); |
d7e09d03 PT |
539 | while (offset >= src->kiov_len) { /* skip initial frags */ |
540 | offset -= src->kiov_len; | |
541 | src_niov--; | |
542 | src++; | |
af66a6e2 | 543 | LASSERT(src_niov > 0); |
d7e09d03 PT |
544 | } |
545 | ||
546 | niov = 1; | |
547 | for (;;) { | |
af66a6e2 LN |
548 | LASSERT(src_niov > 0); |
549 | LASSERT((int)niov <= dst_niov); | |
d7e09d03 PT |
550 | |
551 | frag_len = src->kiov_len - offset; | |
552 | dst->kiov_page = src->kiov_page; | |
553 | dst->kiov_offset = src->kiov_offset + offset; | |
554 | ||
555 | if (len <= frag_len) { | |
556 | dst->kiov_len = len; | |
ae4003f0 | 557 | LASSERT(dst->kiov_offset + dst->kiov_len |
c314c319 | 558 | <= PAGE_CACHE_SIZE); |
2b5f2e44 | 559 | return niov; |
d7e09d03 PT |
560 | } |
561 | ||
562 | dst->kiov_len = frag_len; | |
af66a6e2 | 563 | LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_CACHE_SIZE); |
d7e09d03 PT |
564 | |
565 | len -= frag_len; | |
566 | dst++; | |
567 | src++; | |
568 | niov++; | |
569 | src_niov--; | |
570 | offset = 0; | |
571 | } | |
572 | } | |
573 | EXPORT_SYMBOL(lnet_extract_kiov); | |
574 | ||
f526b20a | 575 | static void |
d7e09d03 PT |
576 | lnet_ni_recv(lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed, |
577 | unsigned int offset, unsigned int mlen, unsigned int rlen) | |
578 | { | |
7e7ab095 | 579 | unsigned int niov = 0; |
f351bad2 | 580 | struct kvec *iov = NULL; |
7e7ab095 MS |
581 | lnet_kiov_t *kiov = NULL; |
582 | int rc; | |
d7e09d03 | 583 | |
af66a6e2 | 584 | LASSERT(!in_interrupt()); |
5fd88337 | 585 | LASSERT(!mlen || msg); |
d7e09d03 | 586 | |
06ace26e | 587 | if (msg) { |
d7e09d03 PT |
588 | LASSERT(msg->msg_receiving); |
589 | LASSERT(!msg->msg_sending); | |
590 | LASSERT(rlen == msg->msg_len); | |
591 | LASSERT(mlen <= msg->msg_len); | |
592 | LASSERT(msg->msg_offset == offset); | |
593 | LASSERT(msg->msg_wanted == mlen); | |
594 | ||
595 | msg->msg_receiving = 0; | |
596 | ||
5fd88337 | 597 | if (mlen) { |
d7e09d03 PT |
598 | niov = msg->msg_niov; |
599 | iov = msg->msg_iov; | |
600 | kiov = msg->msg_kiov; | |
601 | ||
af66a6e2 | 602 | LASSERT(niov > 0); |
06ace26e | 603 | LASSERT(!iov != !kiov); |
d7e09d03 PT |
604 | } |
605 | } | |
606 | ||
0eee6778 JS |
607 | rc = ni->ni_lnd->lnd_recv(ni, private, msg, delayed, |
608 | niov, iov, kiov, offset, mlen, rlen); | |
d7e09d03 PT |
609 | if (rc < 0) |
610 | lnet_finalize(ni, msg, rc); | |
611 | } | |
612 | ||
f526b20a | 613 | static void |
d7e09d03 PT |
614 | lnet_setpayloadbuffer(lnet_msg_t *msg) |
615 | { | |
616 | lnet_libmd_t *md = msg->msg_md; | |
617 | ||
af66a6e2 LN |
618 | LASSERT(msg->msg_len > 0); |
619 | LASSERT(!msg->msg_routing); | |
06ace26e | 620 | LASSERT(md); |
5fd88337 | 621 | LASSERT(!msg->msg_niov); |
06ace26e JS |
622 | LASSERT(!msg->msg_iov); |
623 | LASSERT(!msg->msg_kiov); | |
d7e09d03 PT |
624 | |
625 | msg->msg_niov = md->md_niov; | |
5fd88337 | 626 | if (md->md_options & LNET_MD_KIOV) |
d7e09d03 PT |
627 | msg->msg_kiov = md->md_iov.kiov; |
628 | else | |
629 | msg->msg_iov = md->md_iov.iov; | |
630 | } | |
631 | ||
632 | void | |
633 | lnet_prep_send(lnet_msg_t *msg, int type, lnet_process_id_t target, | |
634 | unsigned int offset, unsigned int len) | |
635 | { | |
636 | msg->msg_type = type; | |
637 | msg->msg_target = target; | |
638 | msg->msg_len = len; | |
639 | msg->msg_offset = offset; | |
640 | ||
5fd88337 | 641 | if (len) |
d7e09d03 PT |
642 | lnet_setpayloadbuffer(msg); |
643 | ||
af66a6e2 | 644 | memset(&msg->msg_hdr, 0, sizeof(msg->msg_hdr)); |
d7e09d03 PT |
645 | msg->msg_hdr.type = cpu_to_le32(type); |
646 | msg->msg_hdr.dest_nid = cpu_to_le64(target.nid); | |
647 | msg->msg_hdr.dest_pid = cpu_to_le32(target.pid); | |
648 | /* src_nid will be set later */ | |
649 | msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid); | |
650 | msg->msg_hdr.payload_length = cpu_to_le32(len); | |
651 | } | |
652 | ||
f526b20a | 653 | static void |
d7e09d03 PT |
654 | lnet_ni_send(lnet_ni_t *ni, lnet_msg_t *msg) |
655 | { | |
7e7ab095 MS |
656 | void *priv = msg->msg_private; |
657 | int rc; | |
d7e09d03 | 658 | |
af66a6e2 LN |
659 | LASSERT(!in_interrupt()); |
660 | LASSERT(LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND || | |
c314c319 | 661 | (msg->msg_txcredit && msg->msg_peertxcredit)); |
d7e09d03 | 662 | |
0eee6778 | 663 | rc = ni->ni_lnd->lnd_send(ni, priv, msg); |
d7e09d03 PT |
664 | if (rc < 0) |
665 | lnet_finalize(ni, msg, rc); | |
666 | } | |
667 | ||
f526b20a | 668 | static int |
d7e09d03 PT |
669 | lnet_ni_eager_recv(lnet_ni_t *ni, lnet_msg_t *msg) |
670 | { | |
7e7ab095 | 671 | int rc; |
d7e09d03 PT |
672 | |
673 | LASSERT(!msg->msg_sending); | |
674 | LASSERT(msg->msg_receiving); | |
675 | LASSERT(!msg->msg_rx_ready_delay); | |
06ace26e | 676 | LASSERT(ni->ni_lnd->lnd_eager_recv); |
d7e09d03 PT |
677 | |
678 | msg->msg_rx_ready_delay = 1; | |
0eee6778 JS |
679 | rc = ni->ni_lnd->lnd_eager_recv(ni, msg->msg_private, msg, |
680 | &msg->msg_private); | |
5fd88337 | 681 | if (rc) { |
2d00bd17 | 682 | CERROR("recv from %s / send to %s aborted: eager_recv failed %d\n", |
d7e09d03 PT |
683 | libcfs_nid2str(msg->msg_rxpeer->lp_nid), |
684 | libcfs_id2str(msg->msg_target), rc); | |
685 | LASSERT(rc < 0); /* required by my callers */ | |
686 | } | |
687 | ||
688 | return rc; | |
689 | } | |
690 | ||
691 | /* NB: caller shall hold a ref on 'lp' as I'd drop lnet_net_lock */ | |
f526b20a | 692 | static void |
d7e09d03 PT |
693 | lnet_ni_query_locked(lnet_ni_t *ni, lnet_peer_t *lp) |
694 | { | |
a649ad1d | 695 | unsigned long last_alive = 0; |
d7e09d03 PT |
696 | |
697 | LASSERT(lnet_peer_aliveness_enabled(lp)); | |
06ace26e | 698 | LASSERT(ni->ni_lnd->lnd_query); |
d7e09d03 PT |
699 | |
700 | lnet_net_unlock(lp->lp_cpt); | |
0eee6778 | 701 | ni->ni_lnd->lnd_query(ni, lp->lp_nid, &last_alive); |
d7e09d03 PT |
702 | lnet_net_lock(lp->lp_cpt); |
703 | ||
704 | lp->lp_last_query = cfs_time_current(); | |
705 | ||
5fd88337 | 706 | if (last_alive) /* NI has updated timestamp */ |
d7e09d03 PT |
707 | lp->lp_last_alive = last_alive; |
708 | } | |
709 | ||
710 | /* NB: always called with lnet_net_lock held */ | |
711 | static inline int | |
a649ad1d | 712 | lnet_peer_is_alive(lnet_peer_t *lp, unsigned long now) |
d7e09d03 | 713 | { |
7e7ab095 | 714 | int alive; |
a649ad1d | 715 | unsigned long deadline; |
d7e09d03 | 716 | |
af66a6e2 | 717 | LASSERT(lnet_peer_aliveness_enabled(lp)); |
d7e09d03 PT |
718 | |
719 | /* Trust lnet_notify() if it has more recent aliveness news, but | |
720 | * ignore the initial assumed death (see lnet_peers_start_down()). | |
721 | */ | |
722 | if (!lp->lp_alive && lp->lp_alive_count > 0 && | |
723 | cfs_time_aftereq(lp->lp_timestamp, lp->lp_last_alive)) | |
724 | return 0; | |
725 | ||
726 | deadline = cfs_time_add(lp->lp_last_alive, | |
727 | cfs_time_seconds(lp->lp_ni->ni_peertimeout)); | |
728 | alive = cfs_time_after(deadline, now); | |
729 | ||
730 | /* Update obsolete lp_alive except for routers assumed to be dead | |
731 | * initially, because router checker would update aliveness in this | |
732 | * case, and moreover lp_last_alive at peer creation is assumed. | |
733 | */ | |
734 | if (alive && !lp->lp_alive && | |
5fd88337 | 735 | !(lnet_isrouter(lp) && !lp->lp_alive_count)) |
d7e09d03 PT |
736 | lnet_notify_locked(lp, 0, 1, lp->lp_last_alive); |
737 | ||
738 | return alive; | |
739 | } | |
740 | ||
4420cfd3 JS |
741 | /* |
742 | * NB: returns 1 when alive, 0 when dead, negative when error; | |
743 | * may drop the lnet_net_lock | |
744 | */ | |
f526b20a | 745 | static int |
af66a6e2 | 746 | lnet_peer_alive_locked(lnet_peer_t *lp) |
d7e09d03 | 747 | { |
a649ad1d | 748 | unsigned long now = cfs_time_current(); |
d7e09d03 PT |
749 | |
750 | if (!lnet_peer_aliveness_enabled(lp)) | |
751 | return -ENODEV; | |
752 | ||
753 | if (lnet_peer_is_alive(lp, now)) | |
754 | return 1; | |
755 | ||
4420cfd3 JS |
756 | /* |
757 | * Peer appears dead, but we should avoid frequent NI queries (at | |
758 | * most once per lnet_queryinterval seconds). | |
759 | */ | |
5fd88337 | 760 | if (lp->lp_last_query) { |
d7e09d03 PT |
761 | static const int lnet_queryinterval = 1; |
762 | ||
a649ad1d | 763 | unsigned long next_query = |
d7e09d03 PT |
764 | cfs_time_add(lp->lp_last_query, |
765 | cfs_time_seconds(lnet_queryinterval)); | |
766 | ||
699503bc | 767 | if (time_before(now, next_query)) { |
d7e09d03 | 768 | if (lp->lp_alive) |
2d00bd17 | 769 | CWARN("Unexpected aliveness of peer %s: %d < %d (%d/%d)\n", |
d7e09d03 PT |
770 | libcfs_nid2str(lp->lp_nid), |
771 | (int)now, (int)next_query, | |
772 | lnet_queryinterval, | |
773 | lp->lp_ni->ni_peertimeout); | |
774 | return 0; | |
775 | } | |
776 | } | |
777 | ||
778 | /* query NI for latest aliveness news */ | |
779 | lnet_ni_query_locked(lp->lp_ni, lp); | |
780 | ||
781 | if (lnet_peer_is_alive(lp, now)) | |
782 | return 1; | |
783 | ||
784 | lnet_notify_locked(lp, 0, 0, lp->lp_last_alive); | |
785 | return 0; | |
786 | } | |
787 | ||
dee2857e IH |
788 | /** |
789 | * \param msg The message to be sent. | |
790 | * \param do_send True if lnet_ni_send() should be called in this function. | |
791 | * lnet_send() is going to lnet_net_unlock immediately after this, so | |
792 | * it sets do_send FALSE and I don't do the unlock/send/lock bit. | |
793 | * | |
ec5fb5be LZ |
794 | * \retval LNET_CREDIT_OK If \a msg sent or OK to send. |
795 | * \retval LNET_CREDIT_WAIT If \a msg blocked for credit. | |
796 | * \retval -EHOSTUNREACH If the next hop of the message appears dead. | |
797 | * \retval -ECANCELED If the MD of the message has been unlinked. | |
dee2857e IH |
798 | */ |
799 | static int | |
d7e09d03 PT |
800 | lnet_post_send_locked(lnet_msg_t *msg, int do_send) |
801 | { | |
7e7ab095 MS |
802 | lnet_peer_t *lp = msg->msg_txpeer; |
803 | lnet_ni_t *ni = lp->lp_ni; | |
804 | int cpt = msg->msg_tx_cpt; | |
805 | struct lnet_tx_queue *tq = ni->ni_tx_queues[cpt]; | |
d7e09d03 PT |
806 | |
807 | /* non-lnet_send() callers have checked before */ | |
808 | LASSERT(!do_send || msg->msg_tx_delayed); | |
809 | LASSERT(!msg->msg_receiving); | |
810 | LASSERT(msg->msg_tx_committed); | |
811 | ||
d7e09d03 | 812 | /* NB 'lp' is always the next hop */ |
5fd88337 JS |
813 | if (!(msg->msg_target.pid & LNET_PID_USERFLAG) && |
814 | !lnet_peer_alive_locked(lp)) { | |
d7e09d03 PT |
815 | the_lnet.ln_counters[cpt]->drop_count++; |
816 | the_lnet.ln_counters[cpt]->drop_length += msg->msg_len; | |
817 | lnet_net_unlock(cpt); | |
818 | ||
819 | CNETERR("Dropping message for %s: peer not alive\n", | |
820 | libcfs_id2str(msg->msg_target)); | |
821 | if (do_send) | |
822 | lnet_finalize(ni, msg, -EHOSTUNREACH); | |
823 | ||
824 | lnet_net_lock(cpt); | |
ec5fb5be | 825 | return -EHOSTUNREACH; |
d7e09d03 PT |
826 | } |
827 | ||
06ace26e | 828 | if (msg->msg_md && |
5fd88337 | 829 | (msg->msg_md->md_flags & LNET_MD_FLAG_ABORTED)) { |
dee2857e IH |
830 | lnet_net_unlock(cpt); |
831 | ||
2d00bd17 | 832 | CNETERR("Aborting message for %s: LNetM[DE]Unlink() already called on the MD/ME.\n", |
dee2857e IH |
833 | libcfs_id2str(msg->msg_target)); |
834 | if (do_send) | |
835 | lnet_finalize(ni, msg, -ECANCELED); | |
836 | ||
837 | lnet_net_lock(cpt); | |
ec5fb5be | 838 | return -ECANCELED; |
dee2857e IH |
839 | } |
840 | ||
d7e09d03 | 841 | if (!msg->msg_peertxcredit) { |
af66a6e2 | 842 | LASSERT((lp->lp_txcredits < 0) == |
c314c319 | 843 | !list_empty(&lp->lp_txq)); |
d7e09d03 PT |
844 | |
845 | msg->msg_peertxcredit = 1; | |
846 | lp->lp_txqnob += msg->msg_len + sizeof(lnet_hdr_t); | |
847 | lp->lp_txcredits--; | |
848 | ||
849 | if (lp->lp_txcredits < lp->lp_mintxcredits) | |
850 | lp->lp_mintxcredits = lp->lp_txcredits; | |
851 | ||
852 | if (lp->lp_txcredits < 0) { | |
853 | msg->msg_tx_delayed = 1; | |
854 | list_add_tail(&msg->msg_list, &lp->lp_txq); | |
ec5fb5be | 855 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
856 | } |
857 | } | |
858 | ||
859 | if (!msg->msg_txcredit) { | |
860 | LASSERT((tq->tq_credits < 0) == | |
861 | !list_empty(&tq->tq_delayed)); | |
862 | ||
863 | msg->msg_txcredit = 1; | |
864 | tq->tq_credits--; | |
865 | ||
866 | if (tq->tq_credits < tq->tq_credits_min) | |
867 | tq->tq_credits_min = tq->tq_credits; | |
868 | ||
869 | if (tq->tq_credits < 0) { | |
870 | msg->msg_tx_delayed = 1; | |
871 | list_add_tail(&msg->msg_list, &tq->tq_delayed); | |
ec5fb5be | 872 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
873 | } |
874 | } | |
875 | ||
876 | if (do_send) { | |
877 | lnet_net_unlock(cpt); | |
878 | lnet_ni_send(ni, msg); | |
879 | lnet_net_lock(cpt); | |
880 | } | |
ec5fb5be | 881 | return LNET_CREDIT_OK; |
d7e09d03 PT |
882 | } |
883 | ||
f526b20a | 884 | static lnet_rtrbufpool_t * |
d7e09d03 PT |
885 | lnet_msg2bufpool(lnet_msg_t *msg) |
886 | { | |
7e7ab095 MS |
887 | lnet_rtrbufpool_t *rbp; |
888 | int cpt; | |
d7e09d03 PT |
889 | |
890 | LASSERT(msg->msg_rx_committed); | |
891 | ||
892 | cpt = msg->msg_rx_cpt; | |
893 | rbp = &the_lnet.ln_rtrpools[cpt][0]; | |
894 | ||
895 | LASSERT(msg->msg_len <= LNET_MTU); | |
896 | while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_CACHE_SIZE) { | |
897 | rbp++; | |
898 | LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]); | |
899 | } | |
900 | ||
901 | return rbp; | |
902 | } | |
903 | ||
f526b20a | 904 | static int |
af66a6e2 | 905 | lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv) |
d7e09d03 | 906 | { |
4420cfd3 JS |
907 | /* |
908 | * lnet_parse is going to lnet_net_unlock immediately after this, so it | |
ec5fb5be LZ |
909 | * sets do_recv FALSE and I don't do the unlock/send/lock bit. |
910 | * I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if | |
911 | * received or OK to receive | |
4420cfd3 | 912 | */ |
7e7ab095 MS |
913 | lnet_peer_t *lp = msg->msg_rxpeer; |
914 | lnet_rtrbufpool_t *rbp; | |
915 | lnet_rtrbuf_t *rb; | |
d7e09d03 | 916 | |
06ace26e JS |
917 | LASSERT(!msg->msg_iov); |
918 | LASSERT(!msg->msg_kiov); | |
5fd88337 | 919 | LASSERT(!msg->msg_niov); |
af66a6e2 LN |
920 | LASSERT(msg->msg_routing); |
921 | LASSERT(msg->msg_receiving); | |
922 | LASSERT(!msg->msg_sending); | |
d7e09d03 PT |
923 | |
924 | /* non-lnet_parse callers only receive delayed messages */ | |
925 | LASSERT(!do_recv || msg->msg_rx_delayed); | |
926 | ||
927 | if (!msg->msg_peerrtrcredit) { | |
af66a6e2 | 928 | LASSERT((lp->lp_rtrcredits < 0) == |
c314c319 | 929 | !list_empty(&lp->lp_rtrq)); |
d7e09d03 PT |
930 | |
931 | msg->msg_peerrtrcredit = 1; | |
932 | lp->lp_rtrcredits--; | |
933 | if (lp->lp_rtrcredits < lp->lp_minrtrcredits) | |
934 | lp->lp_minrtrcredits = lp->lp_rtrcredits; | |
935 | ||
936 | if (lp->lp_rtrcredits < 0) { | |
937 | /* must have checked eager_recv before here */ | |
938 | LASSERT(msg->msg_rx_ready_delay); | |
939 | msg->msg_rx_delayed = 1; | |
940 | list_add_tail(&msg->msg_list, &lp->lp_rtrq); | |
ec5fb5be | 941 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
942 | } |
943 | } | |
944 | ||
945 | rbp = lnet_msg2bufpool(msg); | |
946 | ||
947 | if (!msg->msg_rtrcredit) { | |
d7e09d03 PT |
948 | msg->msg_rtrcredit = 1; |
949 | rbp->rbp_credits--; | |
950 | if (rbp->rbp_credits < rbp->rbp_mincredits) | |
951 | rbp->rbp_mincredits = rbp->rbp_credits; | |
952 | ||
953 | if (rbp->rbp_credits < 0) { | |
954 | /* must have checked eager_recv before here */ | |
955 | LASSERT(msg->msg_rx_ready_delay); | |
956 | msg->msg_rx_delayed = 1; | |
957 | list_add_tail(&msg->msg_list, &rbp->rbp_msgs); | |
ec5fb5be | 958 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
959 | } |
960 | } | |
961 | ||
af66a6e2 | 962 | LASSERT(!list_empty(&rbp->rbp_bufs)); |
d7e09d03 PT |
963 | rb = list_entry(rbp->rbp_bufs.next, lnet_rtrbuf_t, rb_list); |
964 | list_del(&rb->rb_list); | |
965 | ||
966 | msg->msg_niov = rbp->rbp_npages; | |
967 | msg->msg_kiov = &rb->rb_kiov[0]; | |
968 | ||
969 | if (do_recv) { | |
970 | int cpt = msg->msg_rx_cpt; | |
971 | ||
972 | lnet_net_unlock(cpt); | |
973 | lnet_ni_recv(lp->lp_ni, msg->msg_private, msg, 1, | |
974 | 0, msg->msg_len, msg->msg_len); | |
975 | lnet_net_lock(cpt); | |
976 | } | |
ec5fb5be | 977 | return LNET_CREDIT_OK; |
d7e09d03 PT |
978 | } |
979 | ||
980 | void | |
981 | lnet_return_tx_credits_locked(lnet_msg_t *msg) | |
982 | { | |
7e7ab095 MS |
983 | lnet_peer_t *txpeer = msg->msg_txpeer; |
984 | lnet_msg_t *msg2; | |
d7e09d03 PT |
985 | |
986 | if (msg->msg_txcredit) { | |
7e7ab095 | 987 | struct lnet_ni *ni = txpeer->lp_ni; |
d7e09d03 PT |
988 | struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt]; |
989 | ||
990 | /* give back NI txcredits */ | |
991 | msg->msg_txcredit = 0; | |
992 | ||
993 | LASSERT((tq->tq_credits < 0) == | |
994 | !list_empty(&tq->tq_delayed)); | |
995 | ||
996 | tq->tq_credits++; | |
997 | if (tq->tq_credits <= 0) { | |
998 | msg2 = list_entry(tq->tq_delayed.next, | |
c314c319 | 999 | lnet_msg_t, msg_list); |
d7e09d03 PT |
1000 | list_del(&msg2->msg_list); |
1001 | ||
1002 | LASSERT(msg2->msg_txpeer->lp_ni == ni); | |
1003 | LASSERT(msg2->msg_tx_delayed); | |
1004 | ||
1005 | (void) lnet_post_send_locked(msg2, 1); | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | if (msg->msg_peertxcredit) { | |
1010 | /* give back peer txcredits */ | |
1011 | msg->msg_peertxcredit = 0; | |
1012 | ||
1013 | LASSERT((txpeer->lp_txcredits < 0) == | |
1014 | !list_empty(&txpeer->lp_txq)); | |
1015 | ||
1016 | txpeer->lp_txqnob -= msg->msg_len + sizeof(lnet_hdr_t); | |
af66a6e2 | 1017 | LASSERT(txpeer->lp_txqnob >= 0); |
d7e09d03 PT |
1018 | |
1019 | txpeer->lp_txcredits++; | |
1020 | if (txpeer->lp_txcredits <= 0) { | |
1021 | msg2 = list_entry(txpeer->lp_txq.next, | |
c314c319 | 1022 | lnet_msg_t, msg_list); |
d7e09d03 PT |
1023 | list_del(&msg2->msg_list); |
1024 | ||
1025 | LASSERT(msg2->msg_txpeer == txpeer); | |
1026 | LASSERT(msg2->msg_tx_delayed); | |
1027 | ||
1028 | (void) lnet_post_send_locked(msg2, 1); | |
1029 | } | |
1030 | } | |
1031 | ||
06ace26e | 1032 | if (txpeer) { |
d7e09d03 PT |
1033 | msg->msg_txpeer = NULL; |
1034 | lnet_peer_decref_locked(txpeer); | |
1035 | } | |
1036 | } | |
1037 | ||
86ef6250 AS |
1038 | void |
1039 | lnet_schedule_blocked_locked(lnet_rtrbufpool_t *rbp) | |
1040 | { | |
1041 | lnet_msg_t *msg; | |
1042 | ||
1043 | if (list_empty(&rbp->rbp_msgs)) | |
1044 | return; | |
1045 | msg = list_entry(rbp->rbp_msgs.next, | |
1046 | lnet_msg_t, msg_list); | |
1047 | list_del(&msg->msg_list); | |
1048 | ||
1049 | (void)lnet_post_routed_recv_locked(msg, 1); | |
1050 | } | |
1051 | ||
1052 | void | |
1053 | lnet_drop_routed_msgs_locked(struct list_head *list, int cpt) | |
1054 | { | |
1055 | struct list_head drop; | |
1056 | lnet_msg_t *msg; | |
1057 | lnet_msg_t *tmp; | |
1058 | ||
1059 | INIT_LIST_HEAD(&drop); | |
1060 | ||
1061 | list_splice_init(list, &drop); | |
1062 | ||
1063 | lnet_net_unlock(cpt); | |
1064 | ||
1065 | list_for_each_entry_safe(msg, tmp, &drop, msg_list) { | |
1066 | lnet_ni_recv(msg->msg_rxpeer->lp_ni, msg->msg_private, NULL, | |
1067 | 0, 0, 0, msg->msg_hdr.payload_length); | |
1068 | list_del_init(&msg->msg_list); | |
1069 | lnet_finalize(NULL, msg, -ECANCELED); | |
1070 | } | |
1071 | ||
1072 | lnet_net_lock(cpt); | |
1073 | } | |
1074 | ||
d7e09d03 PT |
1075 | void |
1076 | lnet_return_rx_credits_locked(lnet_msg_t *msg) | |
1077 | { | |
7e7ab095 MS |
1078 | lnet_peer_t *rxpeer = msg->msg_rxpeer; |
1079 | lnet_msg_t *msg2; | |
d7e09d03 PT |
1080 | |
1081 | if (msg->msg_rtrcredit) { | |
1082 | /* give back global router credits */ | |
7e7ab095 | 1083 | lnet_rtrbuf_t *rb; |
d7e09d03 PT |
1084 | lnet_rtrbufpool_t *rbp; |
1085 | ||
4420cfd3 JS |
1086 | /* |
1087 | * NB If a msg ever blocks for a buffer in rbp_msgs, it stays | |
d7e09d03 | 1088 | * there until it gets one allocated, or aborts the wait |
4420cfd3 JS |
1089 | * itself |
1090 | */ | |
06ace26e | 1091 | LASSERT(msg->msg_kiov); |
d7e09d03 PT |
1092 | |
1093 | rb = list_entry(msg->msg_kiov, lnet_rtrbuf_t, rb_kiov[0]); | |
1094 | rbp = rb->rb_pool; | |
d7e09d03 PT |
1095 | |
1096 | msg->msg_kiov = NULL; | |
1097 | msg->msg_rtrcredit = 0; | |
1098 | ||
86ef6250 AS |
1099 | LASSERT(rbp == lnet_msg2bufpool(msg)); |
1100 | ||
d7e09d03 PT |
1101 | LASSERT((rbp->rbp_credits > 0) == |
1102 | !list_empty(&rbp->rbp_bufs)); | |
1103 | ||
86ef6250 AS |
1104 | /* |
1105 | * If routing is now turned off, we just drop this buffer and | |
1106 | * don't bother trying to return credits. | |
1107 | */ | |
1108 | if (!the_lnet.ln_routing) { | |
1109 | lnet_destroy_rtrbuf(rb, rbp->rbp_npages); | |
1110 | goto routing_off; | |
1111 | } | |
d7e09d03 | 1112 | |
86ef6250 AS |
1113 | /* |
1114 | * It is possible that a user has lowered the desired number of | |
1115 | * buffers in this pool. Make sure we never put back | |
1116 | * more buffers than the stated number. | |
1117 | */ | |
1118 | if (rbp->rbp_credits >= rbp->rbp_nbuffers) { | |
1119 | /* Discard this buffer so we don't have too many. */ | |
1120 | lnet_destroy_rtrbuf(rb, rbp->rbp_npages); | |
1121 | } else { | |
1122 | list_add(&rb->rb_list, &rbp->rbp_bufs); | |
1123 | rbp->rbp_credits++; | |
1124 | if (rbp->rbp_credits <= 0) | |
1125 | lnet_schedule_blocked_locked(rbp); | |
d7e09d03 PT |
1126 | } |
1127 | } | |
1128 | ||
86ef6250 | 1129 | routing_off: |
d7e09d03 PT |
1130 | if (msg->msg_peerrtrcredit) { |
1131 | /* give back peer router credits */ | |
1132 | msg->msg_peerrtrcredit = 0; | |
1133 | ||
1134 | LASSERT((rxpeer->lp_rtrcredits < 0) == | |
1135 | !list_empty(&rxpeer->lp_rtrq)); | |
1136 | ||
1137 | rxpeer->lp_rtrcredits++; | |
86ef6250 AS |
1138 | /* |
1139 | * drop all messages which are queued to be routed on that | |
1140 | * peer. | |
1141 | */ | |
1142 | if (!the_lnet.ln_routing) { | |
1143 | lnet_drop_routed_msgs_locked(&rxpeer->lp_rtrq, | |
1144 | msg->msg_rx_cpt); | |
1145 | } else if (rxpeer->lp_rtrcredits <= 0) { | |
d7e09d03 | 1146 | msg2 = list_entry(rxpeer->lp_rtrq.next, |
c314c319 | 1147 | lnet_msg_t, msg_list); |
d7e09d03 PT |
1148 | list_del(&msg2->msg_list); |
1149 | ||
1150 | (void) lnet_post_routed_recv_locked(msg2, 1); | |
1151 | } | |
1152 | } | |
06ace26e | 1153 | if (rxpeer) { |
d7e09d03 PT |
1154 | msg->msg_rxpeer = NULL; |
1155 | lnet_peer_decref_locked(rxpeer); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | static int | |
1160 | lnet_compare_routes(lnet_route_t *r1, lnet_route_t *r2) | |
1161 | { | |
1162 | lnet_peer_t *p1 = r1->lr_gateway; | |
1163 | lnet_peer_t *p2 = r2->lr_gateway; | |
1164 | ||
e75fb87f DO |
1165 | if (r1->lr_priority < r2->lr_priority) |
1166 | return 1; | |
1167 | ||
1168 | if (r1->lr_priority > r2->lr_priority) | |
1169 | return -1; | |
1170 | ||
d7e09d03 PT |
1171 | if (r1->lr_hops < r2->lr_hops) |
1172 | return 1; | |
1173 | ||
1174 | if (r1->lr_hops > r2->lr_hops) | |
1175 | return -1; | |
1176 | ||
1177 | if (p1->lp_txqnob < p2->lp_txqnob) | |
1178 | return 1; | |
1179 | ||
1180 | if (p1->lp_txqnob > p2->lp_txqnob) | |
1181 | return -1; | |
1182 | ||
1183 | if (p1->lp_txcredits > p2->lp_txcredits) | |
1184 | return 1; | |
1185 | ||
1186 | if (p1->lp_txcredits < p2->lp_txcredits) | |
1187 | return -1; | |
1188 | ||
1189 | if (r1->lr_seq - r2->lr_seq <= 0) | |
1190 | return 1; | |
1191 | ||
1192 | return -1; | |
1193 | } | |
1194 | ||
1195 | static lnet_peer_t * | |
1196 | lnet_find_route_locked(lnet_ni_t *ni, lnet_nid_t target, lnet_nid_t rtr_nid) | |
1197 | { | |
7e7ab095 | 1198 | lnet_remotenet_t *rnet; |
4f0bedec CH |
1199 | lnet_route_t *route; |
1200 | lnet_route_t *best_route; | |
1201 | lnet_route_t *last_route; | |
7e7ab095 MS |
1202 | struct lnet_peer *lp_best; |
1203 | struct lnet_peer *lp; | |
1204 | int rc; | |
d7e09d03 | 1205 | |
4420cfd3 JS |
1206 | /* |
1207 | * If @rtr_nid is not LNET_NID_ANY, return the gateway with | |
1208 | * rtr_nid nid, otherwise find the best gateway I can use | |
1209 | */ | |
d7e09d03 | 1210 | rnet = lnet_find_net_locked(LNET_NIDNET(target)); |
06ace26e | 1211 | if (!rnet) |
d7e09d03 PT |
1212 | return NULL; |
1213 | ||
1214 | lp_best = NULL; | |
4f0bedec CH |
1215 | best_route = NULL; |
1216 | last_route = NULL; | |
1217 | list_for_each_entry(route, &rnet->lrn_routes, lr_list) { | |
1218 | lp = route->lr_gateway; | |
d7e09d03 | 1219 | |
4ee23a84 | 1220 | if (!lnet_is_route_alive(route)) |
d7e09d03 PT |
1221 | continue; |
1222 | ||
06ace26e | 1223 | if (ni && lp->lp_ni != ni) |
d7e09d03 PT |
1224 | continue; |
1225 | ||
1226 | if (lp->lp_nid == rtr_nid) /* it's pre-determined router */ | |
1227 | return lp; | |
1228 | ||
06ace26e | 1229 | if (!lp_best) { |
4f0bedec CH |
1230 | best_route = route; |
1231 | last_route = route; | |
d7e09d03 PT |
1232 | lp_best = lp; |
1233 | continue; | |
1234 | } | |
1235 | ||
1236 | /* no protection on below fields, but it's harmless */ | |
4f0bedec CH |
1237 | if (last_route->lr_seq - route->lr_seq < 0) |
1238 | last_route = route; | |
d7e09d03 | 1239 | |
4f0bedec | 1240 | rc = lnet_compare_routes(route, best_route); |
d7e09d03 PT |
1241 | if (rc < 0) |
1242 | continue; | |
1243 | ||
4f0bedec | 1244 | best_route = route; |
d7e09d03 PT |
1245 | lp_best = lp; |
1246 | } | |
1247 | ||
4420cfd3 JS |
1248 | /* |
1249 | * set sequence number on the best router to the latest sequence + 1 | |
d7e09d03 | 1250 | * so we can round-robin all routers, it's race and inaccurate but |
4420cfd3 JS |
1251 | * harmless and functional |
1252 | */ | |
4f0bedec CH |
1253 | if (best_route) |
1254 | best_route->lr_seq = last_route->lr_seq + 1; | |
d7e09d03 PT |
1255 | return lp_best; |
1256 | } | |
1257 | ||
1258 | int | |
1259 | lnet_send(lnet_nid_t src_nid, lnet_msg_t *msg, lnet_nid_t rtr_nid) | |
1260 | { | |
7e7ab095 MS |
1261 | lnet_nid_t dst_nid = msg->msg_target.nid; |
1262 | struct lnet_ni *src_ni; | |
1263 | struct lnet_ni *local_ni; | |
1264 | struct lnet_peer *lp; | |
1265 | int cpt; | |
1266 | int cpt2; | |
1267 | int rc; | |
d7e09d03 | 1268 | |
4420cfd3 JS |
1269 | /* |
1270 | * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases, | |
d7e09d03 | 1271 | * but we might want to use pre-determined router for ACK/REPLY |
4420cfd3 JS |
1272 | * in the future |
1273 | */ | |
06ace26e JS |
1274 | /* NB: ni == interface pre-determined (ACK/REPLY) */ |
1275 | LASSERT(!msg->msg_txpeer); | |
af66a6e2 LN |
1276 | LASSERT(!msg->msg_sending); |
1277 | LASSERT(!msg->msg_target_is_router); | |
1278 | LASSERT(!msg->msg_receiving); | |
d7e09d03 PT |
1279 | |
1280 | msg->msg_sending = 1; | |
1281 | ||
1282 | LASSERT(!msg->msg_tx_committed); | |
1283 | cpt = lnet_cpt_of_nid(rtr_nid == LNET_NID_ANY ? dst_nid : rtr_nid); | |
1284 | again: | |
1285 | lnet_net_lock(cpt); | |
1286 | ||
1287 | if (the_lnet.ln_shutdown) { | |
1288 | lnet_net_unlock(cpt); | |
1289 | return -ESHUTDOWN; | |
1290 | } | |
1291 | ||
1292 | if (src_nid == LNET_NID_ANY) { | |
1293 | src_ni = NULL; | |
1294 | } else { | |
1295 | src_ni = lnet_nid2ni_locked(src_nid, cpt); | |
06ace26e | 1296 | if (!src_ni) { |
d7e09d03 | 1297 | lnet_net_unlock(cpt); |
2d00bd17 JP |
1298 | LCONSOLE_WARN("Can't send to %s: src %s is not a local nid\n", |
1299 | libcfs_nid2str(dst_nid), | |
d7e09d03 PT |
1300 | libcfs_nid2str(src_nid)); |
1301 | return -EINVAL; | |
1302 | } | |
af66a6e2 | 1303 | LASSERT(!msg->msg_routing); |
d7e09d03 PT |
1304 | } |
1305 | ||
1306 | /* Is this for someone on a local network? */ | |
1307 | local_ni = lnet_net2ni_locked(LNET_NIDNET(dst_nid), cpt); | |
1308 | ||
06ace26e JS |
1309 | if (local_ni) { |
1310 | if (!src_ni) { | |
d7e09d03 PT |
1311 | src_ni = local_ni; |
1312 | src_nid = src_ni->ni_nid; | |
1313 | } else if (src_ni == local_ni) { | |
1314 | lnet_ni_decref_locked(local_ni, cpt); | |
1315 | } else { | |
1316 | lnet_ni_decref_locked(local_ni, cpt); | |
1317 | lnet_ni_decref_locked(src_ni, cpt); | |
1318 | lnet_net_unlock(cpt); | |
1319 | LCONSOLE_WARN("No route to %s via from %s\n", | |
1320 | libcfs_nid2str(dst_nid), | |
1321 | libcfs_nid2str(src_nid)); | |
1322 | return -EINVAL; | |
1323 | } | |
1324 | ||
1325 | LASSERT(src_nid != LNET_NID_ANY); | |
1326 | lnet_msg_commit(msg, cpt); | |
1327 | ||
1328 | if (!msg->msg_routing) | |
1329 | msg->msg_hdr.src_nid = cpu_to_le64(src_nid); | |
1330 | ||
1331 | if (src_ni == the_lnet.ln_loni) { | |
1332 | /* No send credit hassles with LOLND */ | |
1333 | lnet_net_unlock(cpt); | |
1334 | lnet_ni_send(src_ni, msg); | |
1335 | ||
1336 | lnet_net_lock(cpt); | |
1337 | lnet_ni_decref_locked(src_ni, cpt); | |
1338 | lnet_net_unlock(cpt); | |
1339 | return 0; | |
1340 | } | |
1341 | ||
1342 | rc = lnet_nid2peer_locked(&lp, dst_nid, cpt); | |
1343 | /* lp has ref on src_ni; lose mine */ | |
1344 | lnet_ni_decref_locked(src_ni, cpt); | |
5fd88337 | 1345 | if (rc) { |
d7e09d03 PT |
1346 | lnet_net_unlock(cpt); |
1347 | LCONSOLE_WARN("Error %d finding peer %s\n", rc, | |
1348 | libcfs_nid2str(dst_nid)); | |
1349 | /* ENOMEM or shutting down */ | |
1350 | return rc; | |
1351 | } | |
af66a6e2 | 1352 | LASSERT(lp->lp_ni == src_ni); |
d7e09d03 PT |
1353 | } else { |
1354 | /* sending to a remote network */ | |
1355 | lp = lnet_find_route_locked(src_ni, dst_nid, rtr_nid); | |
06ace26e JS |
1356 | if (!lp) { |
1357 | if (src_ni) | |
d7e09d03 PT |
1358 | lnet_ni_decref_locked(src_ni, cpt); |
1359 | lnet_net_unlock(cpt); | |
1360 | ||
2d00bd17 | 1361 | LCONSOLE_WARN("No route to %s via %s (all routers down)\n", |
d7e09d03 PT |
1362 | libcfs_id2str(msg->msg_target), |
1363 | libcfs_nid2str(src_nid)); | |
1364 | return -EHOSTUNREACH; | |
1365 | } | |
1366 | ||
4420cfd3 JS |
1367 | /* |
1368 | * rtr_nid is LNET_NID_ANY or NID of pre-determined router, | |
d7e09d03 PT |
1369 | * it's possible that rtr_nid isn't LNET_NID_ANY and lp isn't |
1370 | * pre-determined router, this can happen if router table | |
4420cfd3 JS |
1371 | * was changed when we release the lock |
1372 | */ | |
d7e09d03 PT |
1373 | if (rtr_nid != lp->lp_nid) { |
1374 | cpt2 = lnet_cpt_of_nid_locked(lp->lp_nid); | |
1375 | if (cpt2 != cpt) { | |
06ace26e | 1376 | if (src_ni) |
d7e09d03 PT |
1377 | lnet_ni_decref_locked(src_ni, cpt); |
1378 | lnet_net_unlock(cpt); | |
1379 | ||
1380 | rtr_nid = lp->lp_nid; | |
1381 | cpt = cpt2; | |
1382 | goto again; | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | CDEBUG(D_NET, "Best route to %s via %s for %s %d\n", | |
1387 | libcfs_nid2str(dst_nid), libcfs_nid2str(lp->lp_nid), | |
1388 | lnet_msgtyp2str(msg->msg_type), msg->msg_len); | |
1389 | ||
06ace26e | 1390 | if (!src_ni) { |
d7e09d03 PT |
1391 | src_ni = lp->lp_ni; |
1392 | src_nid = src_ni->ni_nid; | |
1393 | } else { | |
af66a6e2 | 1394 | LASSERT(src_ni == lp->lp_ni); |
d7e09d03 PT |
1395 | lnet_ni_decref_locked(src_ni, cpt); |
1396 | } | |
1397 | ||
1398 | lnet_peer_addref_locked(lp); | |
1399 | ||
1400 | LASSERT(src_nid != LNET_NID_ANY); | |
1401 | lnet_msg_commit(msg, cpt); | |
1402 | ||
1403 | if (!msg->msg_routing) { | |
1404 | /* I'm the source and now I know which NI to send on */ | |
1405 | msg->msg_hdr.src_nid = cpu_to_le64(src_nid); | |
1406 | } | |
1407 | ||
1408 | msg->msg_target_is_router = 1; | |
1409 | msg->msg_target.nid = lp->lp_nid; | |
1410 | msg->msg_target.pid = LUSTRE_SRV_LNET_PID; | |
1411 | } | |
1412 | ||
1413 | /* 'lp' is our best choice of peer */ | |
1414 | ||
af66a6e2 LN |
1415 | LASSERT(!msg->msg_peertxcredit); |
1416 | LASSERT(!msg->msg_txcredit); | |
06ace26e | 1417 | LASSERT(!msg->msg_txpeer); |
d7e09d03 PT |
1418 | |
1419 | msg->msg_txpeer = lp; /* msg takes my ref on lp */ | |
1420 | ||
1421 | rc = lnet_post_send_locked(msg, 0); | |
1422 | lnet_net_unlock(cpt); | |
1423 | ||
ec5fb5be LZ |
1424 | if (rc < 0) |
1425 | return rc; | |
d7e09d03 | 1426 | |
ec5fb5be | 1427 | if (rc == LNET_CREDIT_OK) |
d7e09d03 PT |
1428 | lnet_ni_send(src_ni, msg); |
1429 | ||
ec5fb5be | 1430 | return 0; /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT */ |
d7e09d03 PT |
1431 | } |
1432 | ||
1433 | static void | |
1434 | lnet_drop_message(lnet_ni_t *ni, int cpt, void *private, unsigned int nob) | |
1435 | { | |
1436 | lnet_net_lock(cpt); | |
1437 | the_lnet.ln_counters[cpt]->drop_count++; | |
1438 | the_lnet.ln_counters[cpt]->drop_length += nob; | |
1439 | lnet_net_unlock(cpt); | |
1440 | ||
1441 | lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob); | |
1442 | } | |
1443 | ||
1444 | static void | |
1445 | lnet_recv_put(lnet_ni_t *ni, lnet_msg_t *msg) | |
1446 | { | |
7e7ab095 | 1447 | lnet_hdr_t *hdr = &msg->msg_hdr; |
d7e09d03 | 1448 | |
5fd88337 | 1449 | if (msg->msg_wanted) |
d7e09d03 PT |
1450 | lnet_setpayloadbuffer(msg); |
1451 | ||
1452 | lnet_build_msg_event(msg, LNET_EVENT_PUT); | |
1453 | ||
4420cfd3 JS |
1454 | /* |
1455 | * Must I ACK? If so I'll grab the ack_wmd out of the header and put | |
1456 | * it back into the ACK during lnet_finalize() | |
1457 | */ | |
5fd88337 JS |
1458 | msg->msg_ack = !lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) && |
1459 | !(msg->msg_md->md_options & LNET_MD_ACK_DISABLE); | |
d7e09d03 PT |
1460 | |
1461 | lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed, | |
1462 | msg->msg_offset, msg->msg_wanted, hdr->payload_length); | |
1463 | } | |
1464 | ||
1465 | static int | |
1466 | lnet_parse_put(lnet_ni_t *ni, lnet_msg_t *msg) | |
1467 | { | |
7e7ab095 MS |
1468 | lnet_hdr_t *hdr = &msg->msg_hdr; |
1469 | struct lnet_match_info info; | |
1470 | int rc; | |
d7e09d03 PT |
1471 | |
1472 | /* Convert put fields to host byte order */ | |
1473 | hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits); | |
1474 | hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index); | |
1475 | hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset); | |
1476 | ||
1477 | info.mi_id.nid = hdr->src_nid; | |
1478 | info.mi_id.pid = hdr->src_pid; | |
1479 | info.mi_opc = LNET_MD_OP_PUT; | |
1480 | info.mi_portal = hdr->msg.put.ptl_index; | |
1481 | info.mi_rlength = hdr->payload_length; | |
1482 | info.mi_roffset = hdr->msg.put.offset; | |
1483 | info.mi_mbits = hdr->msg.put.match_bits; | |
1484 | ||
06ace26e | 1485 | msg->msg_rx_ready_delay = !ni->ni_lnd->lnd_eager_recv; |
d7e09d03 PT |
1486 | |
1487 | again: | |
1488 | rc = lnet_ptl_match_md(&info, msg); | |
1489 | switch (rc) { | |
1490 | default: | |
1491 | LBUG(); | |
1492 | ||
1493 | case LNET_MATCHMD_OK: | |
1494 | lnet_recv_put(ni, msg); | |
1495 | return 0; | |
1496 | ||
1497 | case LNET_MATCHMD_NONE: | |
1498 | if (msg->msg_rx_delayed) /* attached on delayed list */ | |
1499 | return 0; | |
1500 | ||
1501 | rc = lnet_ni_eager_recv(ni, msg); | |
5fd88337 | 1502 | if (!rc) |
d7e09d03 PT |
1503 | goto again; |
1504 | /* fall through */ | |
1505 | ||
1506 | case LNET_MATCHMD_DROP: | |
b0f5aad5 | 1507 | CNETERR("Dropping PUT from %s portal %d match %llu offset %d length %d: %d\n", |
d7e09d03 PT |
1508 | libcfs_id2str(info.mi_id), info.mi_portal, |
1509 | info.mi_mbits, info.mi_roffset, info.mi_rlength, rc); | |
1510 | ||
1511 | return ENOENT; /* +ve: OK but no match */ | |
1512 | } | |
1513 | } | |
1514 | ||
1515 | static int | |
1516 | lnet_parse_get(lnet_ni_t *ni, lnet_msg_t *msg, int rdma_get) | |
1517 | { | |
7e7ab095 MS |
1518 | struct lnet_match_info info; |
1519 | lnet_hdr_t *hdr = &msg->msg_hdr; | |
1520 | lnet_handle_wire_t reply_wmd; | |
1521 | int rc; | |
d7e09d03 PT |
1522 | |
1523 | /* Convert get fields to host byte order */ | |
7e7ab095 MS |
1524 | hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits); |
1525 | hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index); | |
1526 | hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length); | |
1527 | hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset); | |
1528 | ||
1529 | info.mi_id.nid = hdr->src_nid; | |
1530 | info.mi_id.pid = hdr->src_pid; | |
1531 | info.mi_opc = LNET_MD_OP_GET; | |
1532 | info.mi_portal = hdr->msg.get.ptl_index; | |
1533 | info.mi_rlength = hdr->msg.get.sink_length; | |
1534 | info.mi_roffset = hdr->msg.get.src_offset; | |
1535 | info.mi_mbits = hdr->msg.get.match_bits; | |
d7e09d03 PT |
1536 | |
1537 | rc = lnet_ptl_match_md(&info, msg); | |
1538 | if (rc == LNET_MATCHMD_DROP) { | |
b0f5aad5 | 1539 | CNETERR("Dropping GET from %s portal %d match %llu offset %d length %d\n", |
d7e09d03 PT |
1540 | libcfs_id2str(info.mi_id), info.mi_portal, |
1541 | info.mi_mbits, info.mi_roffset, info.mi_rlength); | |
1542 | return ENOENT; /* +ve: OK but no match */ | |
1543 | } | |
1544 | ||
1545 | LASSERT(rc == LNET_MATCHMD_OK); | |
1546 | ||
1547 | lnet_build_msg_event(msg, LNET_EVENT_GET); | |
1548 | ||
1549 | reply_wmd = hdr->msg.get.return_wmd; | |
1550 | ||
1551 | lnet_prep_send(msg, LNET_MSG_REPLY, info.mi_id, | |
1552 | msg->msg_offset, msg->msg_wanted); | |
1553 | ||
1554 | msg->msg_hdr.msg.reply.dst_wmd = reply_wmd; | |
1555 | ||
1556 | if (rdma_get) { | |
1557 | /* The LND completes the REPLY from her recv procedure */ | |
1558 | lnet_ni_recv(ni, msg->msg_private, msg, 0, | |
1559 | msg->msg_offset, msg->msg_len, msg->msg_len); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0); | |
1564 | msg->msg_receiving = 0; | |
1565 | ||
1566 | rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY); | |
1567 | if (rc < 0) { | |
1568 | /* didn't get as far as lnet_ni_send() */ | |
1569 | CERROR("%s: Unable to send REPLY for GET from %s: %d\n", | |
1570 | libcfs_nid2str(ni->ni_nid), | |
1571 | libcfs_id2str(info.mi_id), rc); | |
1572 | ||
1573 | lnet_finalize(ni, msg, rc); | |
1574 | } | |
1575 | ||
1576 | return 0; | |
1577 | } | |
1578 | ||
1579 | static int | |
1580 | lnet_parse_reply(lnet_ni_t *ni, lnet_msg_t *msg) | |
1581 | { | |
7e7ab095 MS |
1582 | void *private = msg->msg_private; |
1583 | lnet_hdr_t *hdr = &msg->msg_hdr; | |
d7e09d03 | 1584 | lnet_process_id_t src = {0}; |
7e7ab095 MS |
1585 | lnet_libmd_t *md; |
1586 | int rlength; | |
1587 | int mlength; | |
1588 | int cpt; | |
d7e09d03 PT |
1589 | |
1590 | cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie); | |
1591 | lnet_res_lock(cpt); | |
1592 | ||
1593 | src.nid = hdr->src_nid; | |
1594 | src.pid = hdr->src_pid; | |
1595 | ||
1596 | /* NB handles only looked up by creator (no flips) */ | |
1597 | md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd); | |
5fd88337 | 1598 | if (!md || !md->md_threshold || md->md_me) { |
55f5a824 | 1599 | CNETERR("%s: Dropping REPLY from %s for %s MD %#llx.%#llx\n", |
d7e09d03 | 1600 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
06ace26e | 1601 | !md ? "invalid" : "inactive", |
d7e09d03 PT |
1602 | hdr->msg.reply.dst_wmd.wh_interface_cookie, |
1603 | hdr->msg.reply.dst_wmd.wh_object_cookie); | |
06ace26e | 1604 | if (md && md->md_me) |
d7e09d03 PT |
1605 | CERROR("REPLY MD also attached to portal %d\n", |
1606 | md->md_me->me_portal); | |
1607 | ||
1608 | lnet_res_unlock(cpt); | |
1609 | return ENOENT; /* +ve: OK but no match */ | |
1610 | } | |
1611 | ||
5fd88337 | 1612 | LASSERT(!md->md_offset); |
d7e09d03 PT |
1613 | |
1614 | rlength = hdr->payload_length; | |
005b23d6 | 1615 | mlength = min_t(uint, rlength, md->md_length); |
d7e09d03 PT |
1616 | |
1617 | if (mlength < rlength && | |
5fd88337 | 1618 | !(md->md_options & LNET_MD_TRUNCATE)) { |
55f5a824 | 1619 | CNETERR("%s: Dropping REPLY from %s length %d for MD %#llx would overflow (%d)\n", |
d7e09d03 PT |
1620 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
1621 | rlength, hdr->msg.reply.dst_wmd.wh_object_cookie, | |
1622 | mlength); | |
1623 | lnet_res_unlock(cpt); | |
1624 | return ENOENT; /* +ve: OK but no match */ | |
1625 | } | |
1626 | ||
55f5a824 | 1627 | CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md %#llx\n", |
d7e09d03 PT |
1628 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
1629 | mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie); | |
1630 | ||
1631 | lnet_msg_attach_md(msg, md, 0, mlength); | |
1632 | ||
5fd88337 | 1633 | if (mlength) |
d7e09d03 PT |
1634 | lnet_setpayloadbuffer(msg); |
1635 | ||
1636 | lnet_res_unlock(cpt); | |
1637 | ||
1638 | lnet_build_msg_event(msg, LNET_EVENT_REPLY); | |
1639 | ||
1640 | lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength); | |
1641 | return 0; | |
1642 | } | |
1643 | ||
1644 | static int | |
1645 | lnet_parse_ack(lnet_ni_t *ni, lnet_msg_t *msg) | |
1646 | { | |
7e7ab095 | 1647 | lnet_hdr_t *hdr = &msg->msg_hdr; |
d7e09d03 | 1648 | lnet_process_id_t src = {0}; |
7e7ab095 MS |
1649 | lnet_libmd_t *md; |
1650 | int cpt; | |
d7e09d03 PT |
1651 | |
1652 | src.nid = hdr->src_nid; | |
1653 | src.pid = hdr->src_pid; | |
1654 | ||
1655 | /* Convert ack fields to host byte order */ | |
1656 | hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits); | |
1657 | hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength); | |
1658 | ||
1659 | cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie); | |
1660 | lnet_res_lock(cpt); | |
1661 | ||
1662 | /* NB handles only looked up by creator (no flips) */ | |
1663 | md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd); | |
5fd88337 | 1664 | if (!md || !md->md_threshold || md->md_me) { |
d7e09d03 PT |
1665 | /* Don't moan; this is expected */ |
1666 | CDEBUG(D_NET, | |
55f5a824 | 1667 | "%s: Dropping ACK from %s to %s MD %#llx.%#llx\n", |
d7e09d03 | 1668 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
06ace26e | 1669 | !md ? "invalid" : "inactive", |
d7e09d03 PT |
1670 | hdr->msg.ack.dst_wmd.wh_interface_cookie, |
1671 | hdr->msg.ack.dst_wmd.wh_object_cookie); | |
06ace26e | 1672 | if (md && md->md_me) |
d7e09d03 PT |
1673 | CERROR("Source MD also attached to portal %d\n", |
1674 | md->md_me->me_portal); | |
1675 | ||
1676 | lnet_res_unlock(cpt); | |
1677 | return ENOENT; /* +ve! */ | |
1678 | } | |
1679 | ||
55f5a824 | 1680 | CDEBUG(D_NET, "%s: ACK from %s into md %#llx\n", |
d7e09d03 PT |
1681 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
1682 | hdr->msg.ack.dst_wmd.wh_object_cookie); | |
1683 | ||
1684 | lnet_msg_attach_md(msg, md, 0, 0); | |
1685 | ||
1686 | lnet_res_unlock(cpt); | |
1687 | ||
1688 | lnet_build_msg_event(msg, LNET_EVENT_ACK); | |
1689 | ||
1690 | lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len); | |
1691 | return 0; | |
1692 | } | |
1693 | ||
ec5fb5be LZ |
1694 | /** |
1695 | * \retval LNET_CREDIT_OK If \a msg is forwarded | |
1696 | * \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer | |
1697 | * \retval -ve error code | |
1698 | */ | |
d7e09d03 PT |
1699 | static int |
1700 | lnet_parse_forward_locked(lnet_ni_t *ni, lnet_msg_t *msg) | |
1701 | { | |
7e7ab095 | 1702 | int rc = 0; |
d7e09d03 | 1703 | |
86ef6250 AS |
1704 | if (!the_lnet.ln_routing) |
1705 | return -ECANCELED; | |
1706 | ||
d7e09d03 PT |
1707 | if (msg->msg_rxpeer->lp_rtrcredits <= 0 || |
1708 | lnet_msg2bufpool(msg)->rbp_credits <= 0) { | |
06ace26e | 1709 | if (!ni->ni_lnd->lnd_eager_recv) { |
d7e09d03 PT |
1710 | msg->msg_rx_ready_delay = 1; |
1711 | } else { | |
1712 | lnet_net_unlock(msg->msg_rx_cpt); | |
1713 | rc = lnet_ni_eager_recv(ni, msg); | |
1714 | lnet_net_lock(msg->msg_rx_cpt); | |
1715 | } | |
1716 | } | |
1717 | ||
5fd88337 | 1718 | if (!rc) |
d7e09d03 PT |
1719 | rc = lnet_post_routed_recv_locked(msg, 0); |
1720 | return rc; | |
1721 | } | |
1722 | ||
1723 | char * | |
af66a6e2 | 1724 | lnet_msgtyp2str(int type) |
d7e09d03 PT |
1725 | { |
1726 | switch (type) { | |
1727 | case LNET_MSG_ACK: | |
2b5f2e44 | 1728 | return "ACK"; |
d7e09d03 | 1729 | case LNET_MSG_PUT: |
2b5f2e44 | 1730 | return "PUT"; |
d7e09d03 | 1731 | case LNET_MSG_GET: |
2b5f2e44 | 1732 | return "GET"; |
d7e09d03 | 1733 | case LNET_MSG_REPLY: |
2b5f2e44 | 1734 | return "REPLY"; |
d7e09d03 | 1735 | case LNET_MSG_HELLO: |
2b5f2e44 | 1736 | return "HELLO"; |
d7e09d03 | 1737 | default: |
2b5f2e44 | 1738 | return "<UNKNOWN>"; |
d7e09d03 PT |
1739 | } |
1740 | } | |
d7e09d03 PT |
1741 | |
1742 | void | |
51f01fab | 1743 | lnet_print_hdr(lnet_hdr_t *hdr) |
d7e09d03 PT |
1744 | { |
1745 | lnet_process_id_t src = {0}; | |
1746 | lnet_process_id_t dst = {0}; | |
af66a6e2 | 1747 | char *type_str = lnet_msgtyp2str(hdr->type); |
d7e09d03 PT |
1748 | |
1749 | src.nid = hdr->src_nid; | |
1750 | src.pid = hdr->src_pid; | |
1751 | ||
1752 | dst.nid = hdr->dest_nid; | |
1753 | dst.pid = hdr->dest_pid; | |
1754 | ||
1755 | CWARN("P3 Header at %p of type %s\n", hdr, type_str); | |
1756 | CWARN(" From %s\n", libcfs_id2str(src)); | |
1757 | CWARN(" To %s\n", libcfs_id2str(dst)); | |
1758 | ||
1759 | switch (hdr->type) { | |
1760 | default: | |
1761 | break; | |
1762 | ||
1763 | case LNET_MSG_PUT: | |
2d00bd17 | 1764 | CWARN(" Ptl index %d, ack md %#llx.%#llx, match bits %llu\n", |
d7e09d03 PT |
1765 | hdr->msg.put.ptl_index, |
1766 | hdr->msg.put.ack_wmd.wh_interface_cookie, | |
1767 | hdr->msg.put.ack_wmd.wh_object_cookie, | |
1768 | hdr->msg.put.match_bits); | |
55f5a824 | 1769 | CWARN(" Length %d, offset %d, hdr data %#llx\n", |
d7e09d03 PT |
1770 | hdr->payload_length, hdr->msg.put.offset, |
1771 | hdr->msg.put.hdr_data); | |
1772 | break; | |
1773 | ||
1774 | case LNET_MSG_GET: | |
2d00bd17 JP |
1775 | CWARN(" Ptl index %d, return md %#llx.%#llx, match bits %llu\n", |
1776 | hdr->msg.get.ptl_index, | |
d7e09d03 PT |
1777 | hdr->msg.get.return_wmd.wh_interface_cookie, |
1778 | hdr->msg.get.return_wmd.wh_object_cookie, | |
1779 | hdr->msg.get.match_bits); | |
1780 | CWARN(" Length %d, src offset %d\n", | |
1781 | hdr->msg.get.sink_length, | |
1782 | hdr->msg.get.src_offset); | |
1783 | break; | |
1784 | ||
1785 | case LNET_MSG_ACK: | |
2d00bd17 | 1786 | CWARN(" dst md %#llx.%#llx, manipulated length %d\n", |
d7e09d03 PT |
1787 | hdr->msg.ack.dst_wmd.wh_interface_cookie, |
1788 | hdr->msg.ack.dst_wmd.wh_object_cookie, | |
1789 | hdr->msg.ack.mlength); | |
1790 | break; | |
1791 | ||
1792 | case LNET_MSG_REPLY: | |
2d00bd17 | 1793 | CWARN(" dst md %#llx.%#llx, length %d\n", |
d7e09d03 PT |
1794 | hdr->msg.reply.dst_wmd.wh_interface_cookie, |
1795 | hdr->msg.reply.dst_wmd.wh_object_cookie, | |
1796 | hdr->payload_length); | |
1797 | } | |
d7e09d03 PT |
1798 | } |
1799 | ||
1800 | int | |
1801 | lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid, | |
1802 | void *private, int rdma_req) | |
1803 | { | |
7e7ab095 MS |
1804 | int rc = 0; |
1805 | int cpt; | |
1806 | int for_me; | |
1807 | struct lnet_msg *msg; | |
1808 | lnet_pid_t dest_pid; | |
1809 | lnet_nid_t dest_nid; | |
1810 | lnet_nid_t src_nid; | |
1811 | __u32 payload_length; | |
1812 | __u32 type; | |
d7e09d03 | 1813 | |
af66a6e2 | 1814 | LASSERT(!in_interrupt()); |
d7e09d03 PT |
1815 | |
1816 | type = le32_to_cpu(hdr->type); | |
1817 | src_nid = le64_to_cpu(hdr->src_nid); | |
1818 | dest_nid = le64_to_cpu(hdr->dest_nid); | |
1819 | dest_pid = le32_to_cpu(hdr->dest_pid); | |
1820 | payload_length = le32_to_cpu(hdr->payload_length); | |
1821 | ||
1822 | for_me = (ni->ni_nid == dest_nid); | |
1823 | cpt = lnet_cpt_of_nid(from_nid); | |
1824 | ||
1825 | switch (type) { | |
1826 | case LNET_MSG_ACK: | |
1827 | case LNET_MSG_GET: | |
1828 | if (payload_length > 0) { | |
1829 | CERROR("%s, src %s: bad %s payload %d (0 expected)\n", | |
1830 | libcfs_nid2str(from_nid), | |
1831 | libcfs_nid2str(src_nid), | |
1832 | lnet_msgtyp2str(type), payload_length); | |
1833 | return -EPROTO; | |
1834 | } | |
1835 | break; | |
1836 | ||
1837 | case LNET_MSG_PUT: | |
1838 | case LNET_MSG_REPLY: | |
ae4003f0 LN |
1839 | if (payload_length > |
1840 | (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) { | |
2d00bd17 | 1841 | CERROR("%s, src %s: bad %s payload %d (%d max expected)\n", |
d7e09d03 PT |
1842 | libcfs_nid2str(from_nid), |
1843 | libcfs_nid2str(src_nid), | |
1844 | lnet_msgtyp2str(type), | |
1845 | payload_length, | |
1846 | for_me ? LNET_MAX_PAYLOAD : LNET_MTU); | |
1847 | return -EPROTO; | |
1848 | } | |
1849 | break; | |
1850 | ||
1851 | default: | |
1852 | CERROR("%s, src %s: Bad message type 0x%x\n", | |
1853 | libcfs_nid2str(from_nid), | |
1854 | libcfs_nid2str(src_nid), type); | |
1855 | return -EPROTO; | |
1856 | } | |
1857 | ||
1858 | if (the_lnet.ln_routing && | |
ec0067d1 | 1859 | ni->ni_last_alive != ktime_get_real_seconds()) { |
d7e09d03 | 1860 | /* NB: so far here is the only place to set NI status to "up */ |
86ef6250 | 1861 | lnet_ni_lock(ni); |
ec0067d1 | 1862 | ni->ni_last_alive = ktime_get_real_seconds(); |
06ace26e | 1863 | if (ni->ni_status && |
d7e09d03 PT |
1864 | ni->ni_status->ns_status == LNET_NI_STATUS_DOWN) |
1865 | ni->ni_status->ns_status = LNET_NI_STATUS_UP; | |
1866 | lnet_ni_unlock(ni); | |
1867 | } | |
1868 | ||
4420cfd3 JS |
1869 | /* |
1870 | * Regard a bad destination NID as a protocol error. Senders should | |
d7e09d03 | 1871 | * know what they're doing; if they don't they're misconfigured, buggy |
4420cfd3 JS |
1872 | * or malicious so we chop them off at the knees :) |
1873 | */ | |
d7e09d03 PT |
1874 | if (!for_me) { |
1875 | if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) { | |
1876 | /* should have gone direct */ | |
2d00bd17 JP |
1877 | CERROR("%s, src %s: Bad dest nid %s (should have been sent direct)\n", |
1878 | libcfs_nid2str(from_nid), | |
1879 | libcfs_nid2str(src_nid), | |
1880 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1881 | return -EPROTO; |
1882 | } | |
1883 | ||
1884 | if (lnet_islocalnid(dest_nid)) { | |
4420cfd3 JS |
1885 | /* |
1886 | * dest is another local NI; sender should have used | |
1887 | * this node's NID on its own network | |
1888 | */ | |
2d00bd17 JP |
1889 | CERROR("%s, src %s: Bad dest nid %s (it's my nid but on a different network)\n", |
1890 | libcfs_nid2str(from_nid), | |
1891 | libcfs_nid2str(src_nid), | |
1892 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1893 | return -EPROTO; |
1894 | } | |
1895 | ||
1896 | if (rdma_req && type == LNET_MSG_GET) { | |
2d00bd17 JP |
1897 | CERROR("%s, src %s: Bad optimized GET for %s (final destination must be me)\n", |
1898 | libcfs_nid2str(from_nid), | |
1899 | libcfs_nid2str(src_nid), | |
1900 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1901 | return -EPROTO; |
1902 | } | |
1903 | ||
1904 | if (!the_lnet.ln_routing) { | |
2d00bd17 JP |
1905 | CERROR("%s, src %s: Dropping message for %s (routing not enabled)\n", |
1906 | libcfs_nid2str(from_nid), | |
1907 | libcfs_nid2str(src_nid), | |
1908 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1909 | goto drop; |
1910 | } | |
1911 | } | |
1912 | ||
4420cfd3 JS |
1913 | /* |
1914 | * Message looks OK; we're not going to return an error, so we MUST | |
1915 | * call back lnd_recv() come what may... | |
1916 | */ | |
af66a6e2 | 1917 | if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */ |
9b79ca85 | 1918 | fail_peer(src_nid, 0)) { /* shall we now? */ |
d7e09d03 PT |
1919 | CERROR("%s, src %s: Dropping %s to simulate failure\n", |
1920 | libcfs_nid2str(from_nid), libcfs_nid2str(src_nid), | |
1921 | lnet_msgtyp2str(type)); | |
1922 | goto drop; | |
1923 | } | |
1924 | ||
1925 | msg = lnet_msg_alloc(); | |
06ace26e | 1926 | if (!msg) { |
d7e09d03 PT |
1927 | CERROR("%s, src %s: Dropping %s (out of memory)\n", |
1928 | libcfs_nid2str(from_nid), libcfs_nid2str(src_nid), | |
1929 | lnet_msgtyp2str(type)); | |
1930 | goto drop; | |
1931 | } | |
1932 | ||
ae4003f0 LN |
1933 | /* msg zeroed in lnet_msg_alloc; |
1934 | * i.e. flags all clear, pointers NULL etc | |
1935 | */ | |
d7e09d03 PT |
1936 | msg->msg_type = type; |
1937 | msg->msg_private = private; | |
1938 | msg->msg_receiving = 1; | |
d3d3d37a JS |
1939 | msg->msg_wanted = payload_length; |
1940 | msg->msg_len = payload_length; | |
d7e09d03 PT |
1941 | msg->msg_offset = 0; |
1942 | msg->msg_hdr = *hdr; | |
1943 | /* for building message event */ | |
1944 | msg->msg_from = from_nid; | |
1945 | if (!for_me) { | |
1946 | msg->msg_target.pid = dest_pid; | |
1947 | msg->msg_target.nid = dest_nid; | |
1948 | msg->msg_routing = 1; | |
1949 | ||
1950 | } else { | |
1951 | /* convert common msg->hdr fields to host byteorder */ | |
1952 | msg->msg_hdr.type = type; | |
1953 | msg->msg_hdr.src_nid = src_nid; | |
1954 | msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid); | |
1955 | msg->msg_hdr.dest_nid = dest_nid; | |
1956 | msg->msg_hdr.dest_pid = dest_pid; | |
1957 | msg->msg_hdr.payload_length = payload_length; | |
1958 | } | |
1959 | ||
1960 | lnet_net_lock(cpt); | |
1961 | rc = lnet_nid2peer_locked(&msg->msg_rxpeer, from_nid, cpt); | |
5fd88337 | 1962 | if (rc) { |
d7e09d03 | 1963 | lnet_net_unlock(cpt); |
2d00bd17 | 1964 | CERROR("%s, src %s: Dropping %s (error %d looking up sender)\n", |
d7e09d03 PT |
1965 | libcfs_nid2str(from_nid), libcfs_nid2str(src_nid), |
1966 | lnet_msgtyp2str(type), rc); | |
1967 | lnet_msg_free(msg); | |
1968 | goto drop; | |
1969 | } | |
1970 | ||
af3fa7c7 LZ |
1971 | if (lnet_isrouter(msg->msg_rxpeer)) { |
1972 | lnet_peer_set_alive(msg->msg_rxpeer); | |
1973 | if (avoid_asym_router_failure && | |
1974 | LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) { | |
1975 | /* received a remote message from router, update | |
1976 | * remote NI status on this router. | |
1977 | * NB: multi-hop routed message will be ignored. | |
1978 | */ | |
1979 | lnet_router_ni_update_locked(msg->msg_rxpeer, | |
1980 | LNET_NIDNET(src_nid)); | |
1981 | } | |
1982 | } | |
1983 | ||
d7e09d03 PT |
1984 | lnet_msg_commit(msg, cpt); |
1985 | ||
1986 | if (!for_me) { | |
1987 | rc = lnet_parse_forward_locked(ni, msg); | |
1988 | lnet_net_unlock(cpt); | |
1989 | ||
1990 | if (rc < 0) | |
1991 | goto free_drop; | |
ec5fb5be LZ |
1992 | |
1993 | if (rc == LNET_CREDIT_OK) { | |
d7e09d03 PT |
1994 | lnet_ni_recv(ni, msg->msg_private, msg, 0, |
1995 | 0, payload_length, payload_length); | |
1996 | } | |
1997 | return 0; | |
1998 | } | |
1999 | ||
2000 | lnet_net_unlock(cpt); | |
2001 | ||
2002 | switch (type) { | |
2003 | case LNET_MSG_ACK: | |
2004 | rc = lnet_parse_ack(ni, msg); | |
2005 | break; | |
2006 | case LNET_MSG_PUT: | |
2007 | rc = lnet_parse_put(ni, msg); | |
2008 | break; | |
2009 | case LNET_MSG_GET: | |
2010 | rc = lnet_parse_get(ni, msg, rdma_req); | |
2011 | break; | |
2012 | case LNET_MSG_REPLY: | |
2013 | rc = lnet_parse_reply(ni, msg); | |
2014 | break; | |
2015 | default: | |
2016 | LASSERT(0); | |
2017 | rc = -EPROTO; | |
2018 | goto free_drop; /* prevent an unused label if !kernel */ | |
2019 | } | |
2020 | ||
5fd88337 | 2021 | if (!rc) |
d7e09d03 PT |
2022 | return 0; |
2023 | ||
af66a6e2 | 2024 | LASSERT(rc == ENOENT); |
d7e09d03 PT |
2025 | |
2026 | free_drop: | |
06ace26e | 2027 | LASSERT(!msg->msg_md); |
d7e09d03 PT |
2028 | lnet_finalize(ni, msg, rc); |
2029 | ||
2030 | drop: | |
2031 | lnet_drop_message(ni, cpt, private, payload_length); | |
2032 | return 0; | |
2033 | } | |
2034 | EXPORT_SYMBOL(lnet_parse); | |
2035 | ||
2036 | void | |
2037 | lnet_drop_delayed_msg_list(struct list_head *head, char *reason) | |
2038 | { | |
2039 | while (!list_empty(head)) { | |
7e7ab095 MS |
2040 | lnet_process_id_t id = {0}; |
2041 | lnet_msg_t *msg; | |
d7e09d03 PT |
2042 | |
2043 | msg = list_entry(head->next, lnet_msg_t, msg_list); | |
2044 | list_del(&msg->msg_list); | |
2045 | ||
2046 | id.nid = msg->msg_hdr.src_nid; | |
2047 | id.pid = msg->msg_hdr.src_pid; | |
2048 | ||
06ace26e | 2049 | LASSERT(!msg->msg_md); |
d7e09d03 | 2050 | LASSERT(msg->msg_rx_delayed); |
06ace26e | 2051 | LASSERT(msg->msg_rxpeer); |
d7e09d03 PT |
2052 | LASSERT(msg->msg_hdr.type == LNET_MSG_PUT); |
2053 | ||
b0f5aad5 | 2054 | CWARN("Dropping delayed PUT from %s portal %d match %llu offset %d length %d: %s\n", |
d7e09d03 PT |
2055 | libcfs_id2str(id), |
2056 | msg->msg_hdr.msg.put.ptl_index, | |
2057 | msg->msg_hdr.msg.put.match_bits, | |
2058 | msg->msg_hdr.msg.put.offset, | |
2059 | msg->msg_hdr.payload_length, reason); | |
2060 | ||
4420cfd3 JS |
2061 | /* |
2062 | * NB I can't drop msg's ref on msg_rxpeer until after I've | |
d7e09d03 | 2063 | * called lnet_drop_message(), so I just hang onto msg as well |
4420cfd3 JS |
2064 | * until that's done |
2065 | */ | |
d7e09d03 PT |
2066 | lnet_drop_message(msg->msg_rxpeer->lp_ni, |
2067 | msg->msg_rxpeer->lp_cpt, | |
2068 | msg->msg_private, msg->msg_len); | |
2069 | /* | |
2070 | * NB: message will not generate event because w/o attached MD, | |
2071 | * but we still should give error code so lnet_msg_decommit() | |
2072 | * can skip counters operations and other checks. | |
2073 | */ | |
2074 | lnet_finalize(msg->msg_rxpeer->lp_ni, msg, -ENOENT); | |
2075 | } | |
2076 | } | |
2077 | ||
2078 | void | |
2079 | lnet_recv_delayed_msg_list(struct list_head *head) | |
2080 | { | |
2081 | while (!list_empty(head)) { | |
7e7ab095 MS |
2082 | lnet_msg_t *msg; |
2083 | lnet_process_id_t id; | |
d7e09d03 PT |
2084 | |
2085 | msg = list_entry(head->next, lnet_msg_t, msg_list); | |
2086 | list_del(&msg->msg_list); | |
2087 | ||
4420cfd3 JS |
2088 | /* |
2089 | * md won't disappear under me, since each msg | |
2090 | * holds a ref on it | |
2091 | */ | |
d7e09d03 PT |
2092 | id.nid = msg->msg_hdr.src_nid; |
2093 | id.pid = msg->msg_hdr.src_pid; | |
2094 | ||
2095 | LASSERT(msg->msg_rx_delayed); | |
06ace26e JS |
2096 | LASSERT(msg->msg_md); |
2097 | LASSERT(msg->msg_rxpeer); | |
d7e09d03 PT |
2098 | LASSERT(msg->msg_hdr.type == LNET_MSG_PUT); |
2099 | ||
2d00bd17 JP |
2100 | CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d match %llu offset %d length %d.\n", |
2101 | libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index, | |
2102 | msg->msg_hdr.msg.put.match_bits, | |
2103 | msg->msg_hdr.msg.put.offset, | |
2104 | msg->msg_hdr.payload_length); | |
d7e09d03 PT |
2105 | |
2106 | lnet_recv_put(msg->msg_rxpeer->lp_ni, msg); | |
2107 | } | |
2108 | } | |
2109 | ||
2110 | /** | |
2111 | * Initiate an asynchronous PUT operation. | |
2112 | * | |
2113 | * There are several events associated with a PUT: completion of the send on | |
2114 | * the initiator node (LNET_EVENT_SEND), and when the send completes | |
2115 | * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating | |
2116 | * that the operation was accepted by the target. The event LNET_EVENT_PUT is | |
2117 | * used at the target node to indicate the completion of incoming data | |
2118 | * delivery. | |
2119 | * | |
2120 | * The local events will be logged in the EQ associated with the MD pointed to | |
2121 | * by \a mdh handle. Using a MD without an associated EQ results in these | |
2122 | * events being discarded. In this case, the caller must have another | |
2123 | * mechanism (e.g., a higher level protocol) for determining when it is safe | |
2124 | * to modify the memory region associated with the MD. | |
2125 | * | |
2126 | * Note that LNet does not guarantee the order of LNET_EVENT_SEND and | |
2127 | * LNET_EVENT_ACK, though intuitively ACK should happen after SEND. | |
2128 | * | |
2129 | * \param self Indicates the NID of a local interface through which to send | |
2130 | * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself. | |
2131 | * \param mdh A handle for the MD that describes the memory to be sent. The MD | |
2132 | * must be "free floating" (See LNetMDBind()). | |
2133 | * \param ack Controls whether an acknowledgment is requested. | |
2134 | * Acknowledgments are only sent when they are requested by the initiating | |
2135 | * process and the target MD enables them. | |
2136 | * \param target A process identifier for the target process. | |
2137 | * \param portal The index in the \a target's portal table. | |
2138 | * \param match_bits The match bits to use for MD selection at the target | |
2139 | * process. | |
2140 | * \param offset The offset into the target MD (only used when the target | |
2141 | * MD has the LNET_MD_MANAGE_REMOTE option set). | |
2142 | * \param hdr_data 64 bits of user data that can be included in the message | |
2143 | * header. This data is written to an event queue entry at the target if an | |
2144 | * EQ is present on the matching MD. | |
2145 | * | |
2146 | * \retval 0 Success, and only in this case events will be generated | |
2147 | * and logged to EQ (if it exists). | |
2148 | * \retval -EIO Simulated failure. | |
2149 | * \retval -ENOMEM Memory allocation failure. | |
2150 | * \retval -ENOENT Invalid MD object. | |
2151 | * | |
2152 | * \see lnet_event_t::hdr_data and lnet_event_kind_t. | |
2153 | */ | |
2154 | int | |
2155 | LNetPut(lnet_nid_t self, lnet_handle_md_t mdh, lnet_ack_req_t ack, | |
2156 | lnet_process_id_t target, unsigned int portal, | |
2157 | __u64 match_bits, unsigned int offset, | |
2158 | __u64 hdr_data) | |
2159 | { | |
7e7ab095 MS |
2160 | struct lnet_msg *msg; |
2161 | struct lnet_libmd *md; | |
2162 | int cpt; | |
2163 | int rc; | |
d7e09d03 | 2164 | |
af66a6e2 LN |
2165 | LASSERT(the_lnet.ln_init); |
2166 | LASSERT(the_lnet.ln_refcount > 0); | |
d7e09d03 | 2167 | |
af66a6e2 | 2168 | if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */ |
9b79ca85 | 2169 | fail_peer(target.nid, 1)) { /* shall we now? */ |
d7e09d03 PT |
2170 | CERROR("Dropping PUT to %s: simulated failure\n", |
2171 | libcfs_id2str(target)); | |
2172 | return -EIO; | |
2173 | } | |
2174 | ||
2175 | msg = lnet_msg_alloc(); | |
06ace26e | 2176 | if (!msg) { |
d7e09d03 PT |
2177 | CERROR("Dropping PUT to %s: ENOMEM on lnet_msg_t\n", |
2178 | libcfs_id2str(target)); | |
2179 | return -ENOMEM; | |
2180 | } | |
2181 | msg->msg_vmflush = !!memory_pressure_get(); | |
2182 | ||
2183 | cpt = lnet_cpt_of_cookie(mdh.cookie); | |
2184 | lnet_res_lock(cpt); | |
2185 | ||
2186 | md = lnet_handle2md(&mdh); | |
5fd88337 | 2187 | if (!md || !md->md_threshold || md->md_me) { |
b0f5aad5 | 2188 | CERROR("Dropping PUT (%llu:%d:%s): MD (%d) invalid\n", |
d7e09d03 | 2189 | match_bits, portal, libcfs_id2str(target), |
06ace26e JS |
2190 | !md ? -1 : md->md_threshold); |
2191 | if (md && md->md_me) | |
d7e09d03 PT |
2192 | CERROR("Source MD also attached to portal %d\n", |
2193 | md->md_me->me_portal); | |
2194 | lnet_res_unlock(cpt); | |
2195 | ||
2196 | lnet_msg_free(msg); | |
2197 | return -ENOENT; | |
2198 | } | |
2199 | ||
2200 | CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target)); | |
2201 | ||
2202 | lnet_msg_attach_md(msg, md, 0, 0); | |
2203 | ||
2204 | lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length); | |
2205 | ||
2206 | msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits); | |
2207 | msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal); | |
2208 | msg->msg_hdr.msg.put.offset = cpu_to_le32(offset); | |
2209 | msg->msg_hdr.msg.put.hdr_data = hdr_data; | |
2210 | ||
2211 | /* NB handles only looked up by creator (no flips) */ | |
2212 | if (ack == LNET_ACK_REQ) { | |
2213 | msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie = | |
2214 | the_lnet.ln_interface_cookie; | |
2215 | msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie = | |
2216 | md->md_lh.lh_cookie; | |
2217 | } else { | |
2218 | msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie = | |
2219 | LNET_WIRE_HANDLE_COOKIE_NONE; | |
2220 | msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie = | |
2221 | LNET_WIRE_HANDLE_COOKIE_NONE; | |
2222 | } | |
2223 | ||
2224 | lnet_res_unlock(cpt); | |
2225 | ||
2226 | lnet_build_msg_event(msg, LNET_EVENT_SEND); | |
2227 | ||
2228 | rc = lnet_send(self, msg, LNET_NID_ANY); | |
5fd88337 | 2229 | if (rc) { |
af66a6e2 | 2230 | CNETERR("Error sending PUT to %s: %d\n", |
c314c319 | 2231 | libcfs_id2str(target), rc); |
af66a6e2 | 2232 | lnet_finalize(NULL, msg, rc); |
d7e09d03 PT |
2233 | } |
2234 | ||
2235 | /* completion will be signalled by an event */ | |
2236 | return 0; | |
2237 | } | |
2238 | EXPORT_SYMBOL(LNetPut); | |
2239 | ||
2240 | lnet_msg_t * | |
af66a6e2 | 2241 | lnet_create_reply_msg(lnet_ni_t *ni, lnet_msg_t *getmsg) |
d7e09d03 | 2242 | { |
4420cfd3 JS |
2243 | /* |
2244 | * The LND can DMA direct to the GET md (i.e. no REPLY msg). This | |
d7e09d03 PT |
2245 | * returns a msg for the LND to pass to lnet_finalize() when the sink |
2246 | * data has been received. | |
2247 | * | |
2248 | * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when | |
4420cfd3 JS |
2249 | * lnet_finalize() is called on it, so the LND must call this first |
2250 | */ | |
7e7ab095 MS |
2251 | struct lnet_msg *msg = lnet_msg_alloc(); |
2252 | struct lnet_libmd *getmd = getmsg->msg_md; | |
2253 | lnet_process_id_t peer_id = getmsg->msg_target; | |
2254 | int cpt; | |
d7e09d03 PT |
2255 | |
2256 | LASSERT(!getmsg->msg_target_is_router); | |
2257 | LASSERT(!getmsg->msg_routing); | |
2258 | ||
06ace26e | 2259 | if (!msg) { |
af66a6e2 | 2260 | CERROR("%s: Dropping REPLY from %s: can't allocate msg\n", |
c314c319 | 2261 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id)); |
d7e09d03 PT |
2262 | goto drop; |
2263 | } | |
2264 | ||
600e9b49 LZ |
2265 | cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie); |
2266 | lnet_res_lock(cpt); | |
2267 | ||
2268 | LASSERT(getmd->md_refcount > 0); | |
2269 | ||
5fd88337 | 2270 | if (!getmd->md_threshold) { |
af66a6e2 | 2271 | CERROR("%s: Dropping REPLY from %s for inactive MD %p\n", |
c314c319 JS |
2272 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), |
2273 | getmd); | |
d7e09d03 PT |
2274 | lnet_res_unlock(cpt); |
2275 | goto drop; | |
2276 | } | |
2277 | ||
5fd88337 | 2278 | LASSERT(!getmd->md_offset); |
d7e09d03 PT |
2279 | |
2280 | CDEBUG(D_NET, "%s: Reply from %s md %p\n", | |
2281 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd); | |
2282 | ||
2283 | /* setup information for lnet_build_msg_event */ | |
2284 | msg->msg_from = peer_id.nid; | |
2285 | msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */ | |
2286 | msg->msg_hdr.src_nid = peer_id.nid; | |
2287 | msg->msg_hdr.payload_length = getmd->md_length; | |
2288 | msg->msg_receiving = 1; /* required by lnet_msg_attach_md */ | |
2289 | ||
2290 | lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length); | |
2291 | lnet_res_unlock(cpt); | |
2292 | ||
2293 | cpt = lnet_cpt_of_nid(peer_id.nid); | |
2294 | ||
2295 | lnet_net_lock(cpt); | |
2296 | lnet_msg_commit(msg, cpt); | |
2297 | lnet_net_unlock(cpt); | |
2298 | ||
2299 | lnet_build_msg_event(msg, LNET_EVENT_REPLY); | |
2300 | ||
2301 | return msg; | |
2302 | ||
2303 | drop: | |
2304 | cpt = lnet_cpt_of_nid(peer_id.nid); | |
2305 | ||
2306 | lnet_net_lock(cpt); | |
2307 | the_lnet.ln_counters[cpt]->drop_count++; | |
2308 | the_lnet.ln_counters[cpt]->drop_length += getmd->md_length; | |
2309 | lnet_net_unlock(cpt); | |
2310 | ||
06ace26e | 2311 | if (msg) |
d7e09d03 PT |
2312 | lnet_msg_free(msg); |
2313 | ||
2314 | return NULL; | |
2315 | } | |
2316 | EXPORT_SYMBOL(lnet_create_reply_msg); | |
2317 | ||
2318 | void | |
2319 | lnet_set_reply_msg_len(lnet_ni_t *ni, lnet_msg_t *reply, unsigned int len) | |
2320 | { | |
4420cfd3 JS |
2321 | /* |
2322 | * Set the REPLY length, now the RDMA that elides the REPLY message has | |
2323 | * completed and I know it. | |
2324 | */ | |
06ace26e | 2325 | LASSERT(reply); |
af66a6e2 LN |
2326 | LASSERT(reply->msg_type == LNET_MSG_GET); |
2327 | LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY); | |
d7e09d03 | 2328 | |
4420cfd3 JS |
2329 | /* |
2330 | * NB I trusted my peer to RDMA. If she tells me she's written beyond | |
2331 | * the end of my buffer, I might as well be dead. | |
2332 | */ | |
af66a6e2 | 2333 | LASSERT(len <= reply->msg_ev.mlength); |
d7e09d03 PT |
2334 | |
2335 | reply->msg_ev.mlength = len; | |
2336 | } | |
2337 | EXPORT_SYMBOL(lnet_set_reply_msg_len); | |
2338 | ||
2339 | /** | |
2340 | * Initiate an asynchronous GET operation. | |
2341 | * | |
2342 | * On the initiator node, an LNET_EVENT_SEND is logged when the GET request | |
2343 | * is sent, and an LNET_EVENT_REPLY is logged when the data returned from | |
2344 | * the target node in the REPLY has been written to local MD. | |
2345 | * | |
2346 | * On the target node, an LNET_EVENT_GET is logged when the GET request | |
2347 | * arrives and is accepted into a MD. | |
2348 | * | |
2349 | * \param self,target,portal,match_bits,offset See the discussion in LNetPut(). | |
2350 | * \param mdh A handle for the MD that describes the memory into which the | |
ae4003f0 LN |
2351 | * requested data will be received. The MD must be "free floating" |
2352 | * (See LNetMDBind()). | |
d7e09d03 PT |
2353 | * |
2354 | * \retval 0 Success, and only in this case events will be generated | |
2355 | * and logged to EQ (if it exists) of the MD. | |
2356 | * \retval -EIO Simulated failure. | |
2357 | * \retval -ENOMEM Memory allocation failure. | |
2358 | * \retval -ENOENT Invalid MD object. | |
2359 | */ | |
2360 | int | |
2361 | LNetGet(lnet_nid_t self, lnet_handle_md_t mdh, | |
2362 | lnet_process_id_t target, unsigned int portal, | |
2363 | __u64 match_bits, unsigned int offset) | |
2364 | { | |
7e7ab095 MS |
2365 | struct lnet_msg *msg; |
2366 | struct lnet_libmd *md; | |
2367 | int cpt; | |
2368 | int rc; | |
d7e09d03 | 2369 | |
af66a6e2 LN |
2370 | LASSERT(the_lnet.ln_init); |
2371 | LASSERT(the_lnet.ln_refcount > 0); | |
d7e09d03 | 2372 | |
af66a6e2 | 2373 | if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */ |
9b79ca85 | 2374 | fail_peer(target.nid, 1)) { /* shall we now? */ |
d7e09d03 PT |
2375 | CERROR("Dropping GET to %s: simulated failure\n", |
2376 | libcfs_id2str(target)); | |
2377 | return -EIO; | |
2378 | } | |
2379 | ||
2380 | msg = lnet_msg_alloc(); | |
06ace26e | 2381 | if (!msg) { |
d7e09d03 PT |
2382 | CERROR("Dropping GET to %s: ENOMEM on lnet_msg_t\n", |
2383 | libcfs_id2str(target)); | |
2384 | return -ENOMEM; | |
2385 | } | |
2386 | ||
2387 | cpt = lnet_cpt_of_cookie(mdh.cookie); | |
2388 | lnet_res_lock(cpt); | |
2389 | ||
2390 | md = lnet_handle2md(&mdh); | |
5fd88337 | 2391 | if (!md || !md->md_threshold || md->md_me) { |
b0f5aad5 | 2392 | CERROR("Dropping GET (%llu:%d:%s): MD (%d) invalid\n", |
d7e09d03 | 2393 | match_bits, portal, libcfs_id2str(target), |
06ace26e JS |
2394 | !md ? -1 : md->md_threshold); |
2395 | if (md && md->md_me) | |
d7e09d03 PT |
2396 | CERROR("REPLY MD also attached to portal %d\n", |
2397 | md->md_me->me_portal); | |
2398 | ||
2399 | lnet_res_unlock(cpt); | |
2400 | ||
2401 | lnet_msg_free(msg); | |
d7e09d03 PT |
2402 | return -ENOENT; |
2403 | } | |
2404 | ||
2405 | CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target)); | |
2406 | ||
2407 | lnet_msg_attach_md(msg, md, 0, 0); | |
2408 | ||
2409 | lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0); | |
2410 | ||
2411 | msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits); | |
2412 | msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal); | |
2413 | msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset); | |
2414 | msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length); | |
2415 | ||
2416 | /* NB handles only looked up by creator (no flips) */ | |
2417 | msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie = | |
2418 | the_lnet.ln_interface_cookie; | |
2419 | msg->msg_hdr.msg.get.return_wmd.wh_object_cookie = | |
2420 | md->md_lh.lh_cookie; | |
2421 | ||
2422 | lnet_res_unlock(cpt); | |
2423 | ||
2424 | lnet_build_msg_event(msg, LNET_EVENT_SEND); | |
2425 | ||
2426 | rc = lnet_send(self, msg, LNET_NID_ANY); | |
2427 | if (rc < 0) { | |
af66a6e2 | 2428 | CNETERR("Error sending GET to %s: %d\n", |
c314c319 | 2429 | libcfs_id2str(target), rc); |
af66a6e2 | 2430 | lnet_finalize(NULL, msg, rc); |
d7e09d03 PT |
2431 | } |
2432 | ||
2433 | /* completion will be signalled by an event */ | |
2434 | return 0; | |
2435 | } | |
2436 | EXPORT_SYMBOL(LNetGet); | |
2437 | ||
2438 | /** | |
2439 | * Calculate distance to node at \a dstnid. | |
2440 | * | |
2441 | * \param dstnid Target NID. | |
2442 | * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid | |
2443 | * is saved here. | |
2444 | * \param orderp If not NULL, order of the route to reach \a dstnid is saved | |
2445 | * here. | |
2446 | * | |
2447 | * \retval 0 If \a dstnid belongs to a local interface, and reserved option | |
2448 | * local_nid_dist_zero is set, which is the default. | |
2449 | * \retval positives Distance to target NID, i.e. number of hops plus one. | |
2450 | * \retval -EHOSTUNREACH If \a dstnid is not reachable. | |
2451 | */ | |
2452 | int | |
2453 | LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp) | |
2454 | { | |
7e7ab095 MS |
2455 | struct list_head *e; |
2456 | struct lnet_ni *ni; | |
2457 | lnet_remotenet_t *rnet; | |
2458 | __u32 dstnet = LNET_NIDNET(dstnid); | |
2459 | int hops; | |
2460 | int cpt; | |
2461 | __u32 order = 2; | |
2462 | struct list_head *rn_list; | |
d7e09d03 | 2463 | |
4420cfd3 JS |
2464 | /* |
2465 | * if !local_nid_dist_zero, I don't return a distance of 0 ever | |
d7e09d03 PT |
2466 | * (when lustre sees a distance of 0, it substitutes 0@lo), so I |
2467 | * keep order 0 free for 0@lo and order 1 free for a local NID | |
4420cfd3 JS |
2468 | * match |
2469 | */ | |
af66a6e2 LN |
2470 | LASSERT(the_lnet.ln_init); |
2471 | LASSERT(the_lnet.ln_refcount > 0); | |
d7e09d03 PT |
2472 | |
2473 | cpt = lnet_net_lock_current(); | |
2474 | ||
af66a6e2 | 2475 | list_for_each(e, &the_lnet.ln_nis) { |
d7e09d03 PT |
2476 | ni = list_entry(e, lnet_ni_t, ni_list); |
2477 | ||
2478 | if (ni->ni_nid == dstnid) { | |
06ace26e | 2479 | if (srcnidp) |
d7e09d03 | 2480 | *srcnidp = dstnid; |
06ace26e | 2481 | if (orderp) { |
d7e09d03 PT |
2482 | if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND) |
2483 | *orderp = 0; | |
2484 | else | |
2485 | *orderp = 1; | |
2486 | } | |
2487 | lnet_net_unlock(cpt); | |
2488 | ||
2489 | return local_nid_dist_zero ? 0 : 1; | |
2490 | } | |
2491 | ||
2492 | if (LNET_NIDNET(ni->ni_nid) == dstnet) { | |
06ace26e | 2493 | if (srcnidp) |
d7e09d03 | 2494 | *srcnidp = ni->ni_nid; |
06ace26e | 2495 | if (orderp) |
d7e09d03 PT |
2496 | *orderp = order; |
2497 | lnet_net_unlock(cpt); | |
2498 | return 1; | |
2499 | } | |
2500 | ||
2501 | order++; | |
2502 | } | |
2503 | ||
2504 | rn_list = lnet_net2rnethash(dstnet); | |
2505 | list_for_each(e, rn_list) { | |
2506 | rnet = list_entry(e, lnet_remotenet_t, lrn_list); | |
2507 | ||
2508 | if (rnet->lrn_net == dstnet) { | |
2509 | lnet_route_t *route; | |
2510 | lnet_route_t *shortest = NULL; | |
2511 | ||
af66a6e2 | 2512 | LASSERT(!list_empty(&rnet->lrn_routes)); |
d7e09d03 PT |
2513 | |
2514 | list_for_each_entry(route, &rnet->lrn_routes, | |
c314c319 | 2515 | lr_list) { |
06ace26e | 2516 | if (!shortest || |
d7e09d03 PT |
2517 | route->lr_hops < shortest->lr_hops) |
2518 | shortest = route; | |
2519 | } | |
2520 | ||
06ace26e | 2521 | LASSERT(shortest); |
d7e09d03 | 2522 | hops = shortest->lr_hops; |
06ace26e | 2523 | if (srcnidp) |
d7e09d03 | 2524 | *srcnidp = shortest->lr_gateway->lp_ni->ni_nid; |
06ace26e | 2525 | if (orderp) |
d7e09d03 PT |
2526 | *orderp = order; |
2527 | lnet_net_unlock(cpt); | |
2528 | return hops + 1; | |
2529 | } | |
2530 | order++; | |
2531 | } | |
2532 | ||
2533 | lnet_net_unlock(cpt); | |
2534 | return -EHOSTUNREACH; | |
2535 | } | |
2536 | EXPORT_SYMBOL(LNetDist); |