Commit | Line | Data |
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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 | |
d7e09d03 | 62 | /* NB: use lnet_net_lock(0) to serialize operations on test peers */ |
5fd88337 | 63 | if (threshold) { |
d7e09d03 PT |
64 | /* Adding a new entry */ |
65 | LIBCFS_ALLOC(tp, sizeof(*tp)); | |
06ace26e | 66 | if (!tp) |
d7e09d03 PT |
67 | return -ENOMEM; |
68 | ||
69 | tp->tp_nid = nid; | |
70 | tp->tp_threshold = threshold; | |
71 | ||
72 | lnet_net_lock(0); | |
73 | list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers); | |
74 | lnet_net_unlock(0); | |
75 | return 0; | |
76 | } | |
77 | ||
78 | /* removing entries */ | |
79 | INIT_LIST_HEAD(&cull); | |
80 | ||
81 | lnet_net_lock(0); | |
82 | ||
af66a6e2 LN |
83 | list_for_each_safe(el, next, &the_lnet.ln_test_peers) { |
84 | tp = list_entry(el, lnet_test_peer_t, tp_list); | |
d7e09d03 | 85 | |
5fd88337 | 86 | if (!tp->tp_threshold || /* needs culling anyway */ |
d7e09d03 | 87 | nid == LNET_NID_ANY || /* removing all entries */ |
9b79ca85 | 88 | tp->tp_nid == nid) { /* matched this one */ |
af66a6e2 LN |
89 | list_del(&tp->tp_list); |
90 | list_add(&tp->tp_list, &cull); | |
d7e09d03 PT |
91 | } |
92 | } | |
93 | ||
94 | lnet_net_unlock(0); | |
95 | ||
af66a6e2 LN |
96 | while (!list_empty(&cull)) { |
97 | tp = list_entry(cull.next, lnet_test_peer_t, tp_list); | |
d7e09d03 | 98 | |
af66a6e2 LN |
99 | list_del(&tp->tp_list); |
100 | LIBCFS_FREE(tp, sizeof(*tp)); | |
d7e09d03 PT |
101 | } |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int | |
af66a6e2 | 106 | fail_peer(lnet_nid_t nid, int outgoing) |
d7e09d03 PT |
107 | { |
108 | lnet_test_peer_t *tp; | |
7e7ab095 MS |
109 | struct list_head *el; |
110 | struct list_head *next; | |
111 | struct list_head cull; | |
112 | int fail = 0; | |
d7e09d03 | 113 | |
af66a6e2 | 114 | INIT_LIST_HEAD(&cull); |
d7e09d03 PT |
115 | |
116 | /* NB: use lnet_net_lock(0) to serialize operations on test peers */ | |
117 | lnet_net_lock(0); | |
118 | ||
af66a6e2 LN |
119 | list_for_each_safe(el, next, &the_lnet.ln_test_peers) { |
120 | tp = list_entry(el, lnet_test_peer_t, tp_list); | |
d7e09d03 | 121 | |
5fd88337 | 122 | if (!tp->tp_threshold) { |
d7e09d03 PT |
123 | /* zombie entry */ |
124 | if (outgoing) { | |
4420cfd3 JS |
125 | /* |
126 | * only cull zombies on outgoing tests, | |
d7e09d03 | 127 | * since we may be at interrupt priority on |
4420cfd3 JS |
128 | * incoming messages. |
129 | */ | |
af66a6e2 LN |
130 | list_del(&tp->tp_list); |
131 | list_add(&tp->tp_list, &cull); | |
d7e09d03 PT |
132 | } |
133 | continue; | |
134 | } | |
135 | ||
136 | if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */ | |
137 | nid == tp->tp_nid) { /* fail this peer */ | |
138 | fail = 1; | |
139 | ||
140 | if (tp->tp_threshold != LNET_MD_THRESH_INF) { | |
141 | tp->tp_threshold--; | |
142 | if (outgoing && | |
5fd88337 | 143 | !tp->tp_threshold) { |
d7e09d03 | 144 | /* see above */ |
af66a6e2 LN |
145 | list_del(&tp->tp_list); |
146 | list_add(&tp->tp_list, &cull); | |
d7e09d03 PT |
147 | } |
148 | } | |
149 | break; | |
150 | } | |
151 | } | |
152 | ||
153 | lnet_net_unlock(0); | |
154 | ||
af66a6e2 LN |
155 | while (!list_empty(&cull)) { |
156 | tp = list_entry(cull.next, lnet_test_peer_t, tp_list); | |
157 | list_del(&tp->tp_list); | |
d7e09d03 | 158 | |
af66a6e2 | 159 | LIBCFS_FREE(tp, sizeof(*tp)); |
d7e09d03 PT |
160 | } |
161 | ||
2b5f2e44 | 162 | return fail; |
d7e09d03 PT |
163 | } |
164 | ||
165 | unsigned int | |
f351bad2 | 166 | lnet_iov_nob(unsigned int niov, struct kvec *iov) |
d7e09d03 PT |
167 | { |
168 | unsigned int nob = 0; | |
169 | ||
170 | while (niov-- > 0) | |
171 | nob += (iov++)->iov_len; | |
172 | ||
2b5f2e44 | 173 | return nob; |
d7e09d03 PT |
174 | } |
175 | EXPORT_SYMBOL(lnet_iov_nob); | |
176 | ||
177 | void | |
f351bad2 | 178 | lnet_copy_iov2iov(unsigned int ndiov, struct kvec *diov, unsigned int doffset, |
c314c319 JS |
179 | unsigned int nsiov, struct kvec *siov, unsigned int soffset, |
180 | unsigned int nob) | |
d7e09d03 PT |
181 | { |
182 | /* NB diov, siov are READ-ONLY */ | |
7e7ab095 | 183 | unsigned int this_nob; |
d7e09d03 | 184 | |
5fd88337 | 185 | if (!nob) |
d7e09d03 PT |
186 | return; |
187 | ||
188 | /* skip complete frags before 'doffset' */ | |
af66a6e2 | 189 | LASSERT(ndiov > 0); |
d7e09d03 PT |
190 | while (doffset >= diov->iov_len) { |
191 | doffset -= diov->iov_len; | |
192 | diov++; | |
193 | ndiov--; | |
af66a6e2 | 194 | LASSERT(ndiov > 0); |
d7e09d03 PT |
195 | } |
196 | ||
197 | /* skip complete frags before 'soffset' */ | |
af66a6e2 | 198 | LASSERT(nsiov > 0); |
d7e09d03 PT |
199 | while (soffset >= siov->iov_len) { |
200 | soffset -= siov->iov_len; | |
201 | siov++; | |
202 | nsiov--; | |
af66a6e2 | 203 | LASSERT(nsiov > 0); |
d7e09d03 PT |
204 | } |
205 | ||
206 | do { | |
af66a6e2 LN |
207 | LASSERT(ndiov > 0); |
208 | LASSERT(nsiov > 0); | |
0c575417 | 209 | this_nob = min(diov->iov_len - doffset, |
d7e09d03 | 210 | siov->iov_len - soffset); |
0c575417 | 211 | this_nob = min(this_nob, nob); |
d7e09d03 | 212 | |
af66a6e2 | 213 | memcpy((char *)diov->iov_base + doffset, |
c314c319 | 214 | (char *)siov->iov_base + soffset, this_nob); |
d7e09d03 PT |
215 | nob -= this_nob; |
216 | ||
217 | if (diov->iov_len > doffset + this_nob) { | |
218 | doffset += this_nob; | |
219 | } else { | |
220 | diov++; | |
221 | ndiov--; | |
222 | doffset = 0; | |
223 | } | |
224 | ||
225 | if (siov->iov_len > soffset + this_nob) { | |
226 | soffset += this_nob; | |
227 | } else { | |
228 | siov++; | |
229 | nsiov--; | |
230 | soffset = 0; | |
231 | } | |
232 | } while (nob > 0); | |
233 | } | |
234 | EXPORT_SYMBOL(lnet_copy_iov2iov); | |
235 | ||
236 | int | |
f351bad2 | 237 | lnet_extract_iov(int dst_niov, struct kvec *dst, |
c314c319 JS |
238 | int src_niov, struct kvec *src, |
239 | unsigned int offset, unsigned int len) | |
d7e09d03 | 240 | { |
4420cfd3 JS |
241 | /* |
242 | * Initialise 'dst' to the subset of 'src' starting at 'offset', | |
d7e09d03 | 243 | * for exactly 'len' bytes, and return the number of entries. |
4420cfd3 JS |
244 | * NB not destructive to 'src' |
245 | */ | |
7e7ab095 MS |
246 | unsigned int frag_len; |
247 | unsigned int niov; | |
d7e09d03 | 248 | |
5fd88337 | 249 | if (!len) /* no data => */ |
2b5f2e44 | 250 | return 0; /* no frags */ |
d7e09d03 | 251 | |
af66a6e2 | 252 | LASSERT(src_niov > 0); |
d7e09d03 PT |
253 | while (offset >= src->iov_len) { /* skip initial frags */ |
254 | offset -= src->iov_len; | |
255 | src_niov--; | |
256 | src++; | |
af66a6e2 | 257 | LASSERT(src_niov > 0); |
d7e09d03 PT |
258 | } |
259 | ||
260 | niov = 1; | |
261 | for (;;) { | |
af66a6e2 LN |
262 | LASSERT(src_niov > 0); |
263 | LASSERT((int)niov <= dst_niov); | |
d7e09d03 PT |
264 | |
265 | frag_len = src->iov_len - offset; | |
266 | dst->iov_base = ((char *)src->iov_base) + offset; | |
267 | ||
268 | if (len <= frag_len) { | |
269 | dst->iov_len = len; | |
2b5f2e44 | 270 | return niov; |
d7e09d03 PT |
271 | } |
272 | ||
273 | dst->iov_len = frag_len; | |
274 | ||
275 | len -= frag_len; | |
276 | dst++; | |
277 | src++; | |
278 | niov++; | |
279 | src_niov--; | |
280 | offset = 0; | |
281 | } | |
282 | } | |
283 | EXPORT_SYMBOL(lnet_extract_iov); | |
284 | ||
d7e09d03 | 285 | unsigned int |
af66a6e2 | 286 | lnet_kiov_nob(unsigned int niov, lnet_kiov_t *kiov) |
d7e09d03 | 287 | { |
7e7ab095 | 288 | unsigned int nob = 0; |
d7e09d03 PT |
289 | |
290 | while (niov-- > 0) | |
291 | nob += (kiov++)->kiov_len; | |
292 | ||
2b5f2e44 | 293 | return nob; |
d7e09d03 PT |
294 | } |
295 | EXPORT_SYMBOL(lnet_kiov_nob); | |
296 | ||
297 | void | |
af66a6e2 | 298 | lnet_copy_kiov2kiov(unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset, |
ae4003f0 LN |
299 | unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset, |
300 | unsigned int nob) | |
d7e09d03 PT |
301 | { |
302 | /* NB diov, siov are READ-ONLY */ | |
7e7ab095 MS |
303 | unsigned int this_nob; |
304 | char *daddr = NULL; | |
305 | char *saddr = NULL; | |
d7e09d03 | 306 | |
5fd88337 | 307 | if (!nob) |
d7e09d03 PT |
308 | return; |
309 | ||
af66a6e2 | 310 | LASSERT(!in_interrupt()); |
d7e09d03 | 311 | |
af66a6e2 | 312 | LASSERT(ndiov > 0); |
d7e09d03 PT |
313 | while (doffset >= diov->kiov_len) { |
314 | doffset -= diov->kiov_len; | |
315 | diov++; | |
316 | ndiov--; | |
af66a6e2 | 317 | LASSERT(ndiov > 0); |
d7e09d03 PT |
318 | } |
319 | ||
af66a6e2 | 320 | LASSERT(nsiov > 0); |
d7e09d03 PT |
321 | while (soffset >= siov->kiov_len) { |
322 | soffset -= siov->kiov_len; | |
323 | siov++; | |
324 | nsiov--; | |
af66a6e2 | 325 | LASSERT(nsiov > 0); |
d7e09d03 PT |
326 | } |
327 | ||
328 | do { | |
af66a6e2 LN |
329 | LASSERT(ndiov > 0); |
330 | LASSERT(nsiov > 0); | |
0c575417 | 331 | this_nob = min(diov->kiov_len - doffset, |
d7e09d03 | 332 | siov->kiov_len - soffset); |
0c575417 | 333 | this_nob = min(this_nob, nob); |
d7e09d03 | 334 | |
06ace26e | 335 | if (!daddr) |
d7e09d03 PT |
336 | daddr = ((char *)kmap(diov->kiov_page)) + |
337 | diov->kiov_offset + doffset; | |
06ace26e | 338 | if (!saddr) |
d7e09d03 PT |
339 | saddr = ((char *)kmap(siov->kiov_page)) + |
340 | siov->kiov_offset + soffset; | |
341 | ||
4420cfd3 JS |
342 | /* |
343 | * Vanishing risk of kmap deadlock when mapping 2 pages. | |
d7e09d03 | 344 | * However in practice at least one of the kiovs will be mapped |
4420cfd3 JS |
345 | * kernel pages and the map/unmap will be NOOPs |
346 | */ | |
af66a6e2 | 347 | memcpy(daddr, saddr, this_nob); |
d7e09d03 PT |
348 | nob -= this_nob; |
349 | ||
350 | if (diov->kiov_len > doffset + this_nob) { | |
351 | daddr += this_nob; | |
352 | doffset += this_nob; | |
353 | } else { | |
354 | kunmap(diov->kiov_page); | |
355 | daddr = NULL; | |
356 | diov++; | |
357 | ndiov--; | |
358 | doffset = 0; | |
359 | } | |
360 | ||
361 | if (siov->kiov_len > soffset + this_nob) { | |
362 | saddr += this_nob; | |
363 | soffset += this_nob; | |
364 | } else { | |
365 | kunmap(siov->kiov_page); | |
366 | saddr = NULL; | |
367 | siov++; | |
368 | nsiov--; | |
369 | soffset = 0; | |
370 | } | |
371 | } while (nob > 0); | |
372 | ||
06ace26e | 373 | if (daddr) |
d7e09d03 | 374 | kunmap(diov->kiov_page); |
06ace26e | 375 | if (saddr) |
d7e09d03 PT |
376 | kunmap(siov->kiov_page); |
377 | } | |
378 | EXPORT_SYMBOL(lnet_copy_kiov2kiov); | |
379 | ||
380 | void | |
f351bad2 | 381 | lnet_copy_kiov2iov(unsigned int niov, struct kvec *iov, unsigned int iovoffset, |
ae4003f0 LN |
382 | unsigned int nkiov, lnet_kiov_t *kiov, |
383 | unsigned int kiovoffset, unsigned int nob) | |
d7e09d03 PT |
384 | { |
385 | /* NB iov, kiov are READ-ONLY */ | |
7e7ab095 MS |
386 | unsigned int this_nob; |
387 | char *addr = NULL; | |
d7e09d03 | 388 | |
5fd88337 | 389 | if (!nob) |
d7e09d03 PT |
390 | return; |
391 | ||
af66a6e2 | 392 | LASSERT(!in_interrupt()); |
d7e09d03 | 393 | |
af66a6e2 | 394 | LASSERT(niov > 0); |
d7e09d03 PT |
395 | while (iovoffset >= iov->iov_len) { |
396 | iovoffset -= iov->iov_len; | |
397 | iov++; | |
398 | niov--; | |
af66a6e2 | 399 | LASSERT(niov > 0); |
d7e09d03 PT |
400 | } |
401 | ||
af66a6e2 | 402 | LASSERT(nkiov > 0); |
d7e09d03 PT |
403 | while (kiovoffset >= kiov->kiov_len) { |
404 | kiovoffset -= kiov->kiov_len; | |
405 | kiov++; | |
406 | nkiov--; | |
af66a6e2 | 407 | LASSERT(nkiov > 0); |
d7e09d03 PT |
408 | } |
409 | ||
410 | do { | |
af66a6e2 LN |
411 | LASSERT(niov > 0); |
412 | LASSERT(nkiov > 0); | |
fce6ad22 JM |
413 | this_nob = min(iov->iov_len - iovoffset, |
414 | (__kernel_size_t) kiov->kiov_len - kiovoffset); | |
0c575417 | 415 | this_nob = min(this_nob, nob); |
d7e09d03 | 416 | |
06ace26e | 417 | if (!addr) |
d7e09d03 PT |
418 | addr = ((char *)kmap(kiov->kiov_page)) + |
419 | kiov->kiov_offset + kiovoffset; | |
420 | ||
af66a6e2 | 421 | memcpy((char *)iov->iov_base + iovoffset, addr, this_nob); |
d7e09d03 PT |
422 | nob -= this_nob; |
423 | ||
424 | if (iov->iov_len > iovoffset + this_nob) { | |
425 | iovoffset += this_nob; | |
426 | } else { | |
427 | iov++; | |
428 | niov--; | |
429 | iovoffset = 0; | |
430 | } | |
431 | ||
432 | if (kiov->kiov_len > kiovoffset + this_nob) { | |
433 | addr += this_nob; | |
434 | kiovoffset += this_nob; | |
435 | } else { | |
436 | kunmap(kiov->kiov_page); | |
437 | addr = NULL; | |
438 | kiov++; | |
439 | nkiov--; | |
440 | kiovoffset = 0; | |
441 | } | |
442 | ||
443 | } while (nob > 0); | |
444 | ||
06ace26e | 445 | if (addr) |
d7e09d03 PT |
446 | kunmap(kiov->kiov_page); |
447 | } | |
448 | EXPORT_SYMBOL(lnet_copy_kiov2iov); | |
449 | ||
450 | void | |
ae4003f0 LN |
451 | lnet_copy_iov2kiov(unsigned int nkiov, lnet_kiov_t *kiov, |
452 | unsigned int kiovoffset, unsigned int niov, | |
f351bad2 | 453 | struct kvec *iov, unsigned int iovoffset, |
ae4003f0 | 454 | unsigned int nob) |
d7e09d03 PT |
455 | { |
456 | /* NB kiov, iov are READ-ONLY */ | |
7e7ab095 MS |
457 | unsigned int this_nob; |
458 | char *addr = NULL; | |
d7e09d03 | 459 | |
5fd88337 | 460 | if (!nob) |
d7e09d03 PT |
461 | return; |
462 | ||
af66a6e2 | 463 | LASSERT(!in_interrupt()); |
d7e09d03 | 464 | |
af66a6e2 | 465 | LASSERT(nkiov > 0); |
d7e09d03 PT |
466 | while (kiovoffset >= kiov->kiov_len) { |
467 | kiovoffset -= kiov->kiov_len; | |
468 | kiov++; | |
469 | nkiov--; | |
af66a6e2 | 470 | LASSERT(nkiov > 0); |
d7e09d03 PT |
471 | } |
472 | ||
af66a6e2 | 473 | LASSERT(niov > 0); |
d7e09d03 PT |
474 | while (iovoffset >= iov->iov_len) { |
475 | iovoffset -= iov->iov_len; | |
476 | iov++; | |
477 | niov--; | |
af66a6e2 | 478 | LASSERT(niov > 0); |
d7e09d03 PT |
479 | } |
480 | ||
481 | do { | |
af66a6e2 LN |
482 | LASSERT(nkiov > 0); |
483 | LASSERT(niov > 0); | |
fce6ad22 | 484 | this_nob = min((__kernel_size_t) kiov->kiov_len - kiovoffset, |
d7e09d03 | 485 | iov->iov_len - iovoffset); |
0c575417 | 486 | this_nob = min(this_nob, nob); |
d7e09d03 | 487 | |
06ace26e | 488 | if (!addr) |
d7e09d03 PT |
489 | addr = ((char *)kmap(kiov->kiov_page)) + |
490 | kiov->kiov_offset + kiovoffset; | |
491 | ||
af66a6e2 | 492 | memcpy(addr, (char *)iov->iov_base + iovoffset, this_nob); |
d7e09d03 PT |
493 | nob -= this_nob; |
494 | ||
495 | if (kiov->kiov_len > kiovoffset + this_nob) { | |
496 | addr += this_nob; | |
497 | kiovoffset += this_nob; | |
498 | } else { | |
499 | kunmap(kiov->kiov_page); | |
500 | addr = NULL; | |
501 | kiov++; | |
502 | nkiov--; | |
503 | kiovoffset = 0; | |
504 | } | |
505 | ||
506 | if (iov->iov_len > iovoffset + this_nob) { | |
507 | iovoffset += this_nob; | |
508 | } else { | |
509 | iov++; | |
510 | niov--; | |
511 | iovoffset = 0; | |
512 | } | |
513 | } while (nob > 0); | |
514 | ||
06ace26e | 515 | if (addr) |
d7e09d03 PT |
516 | kunmap(kiov->kiov_page); |
517 | } | |
518 | EXPORT_SYMBOL(lnet_copy_iov2kiov); | |
519 | ||
520 | int | |
af66a6e2 | 521 | lnet_extract_kiov(int dst_niov, lnet_kiov_t *dst, |
c314c319 JS |
522 | int src_niov, lnet_kiov_t *src, |
523 | unsigned int offset, unsigned int len) | |
d7e09d03 | 524 | { |
4420cfd3 JS |
525 | /* |
526 | * Initialise 'dst' to the subset of 'src' starting at 'offset', | |
d7e09d03 | 527 | * for exactly 'len' bytes, and return the number of entries. |
4420cfd3 JS |
528 | * NB not destructive to 'src' |
529 | */ | |
7e7ab095 MS |
530 | unsigned int frag_len; |
531 | unsigned int niov; | |
d7e09d03 | 532 | |
5fd88337 | 533 | if (!len) /* no data => */ |
2b5f2e44 | 534 | return 0; /* no frags */ |
d7e09d03 | 535 | |
af66a6e2 | 536 | LASSERT(src_niov > 0); |
d7e09d03 PT |
537 | while (offset >= src->kiov_len) { /* skip initial frags */ |
538 | offset -= src->kiov_len; | |
539 | src_niov--; | |
540 | src++; | |
af66a6e2 | 541 | LASSERT(src_niov > 0); |
d7e09d03 PT |
542 | } |
543 | ||
544 | niov = 1; | |
545 | for (;;) { | |
af66a6e2 LN |
546 | LASSERT(src_niov > 0); |
547 | LASSERT((int)niov <= dst_niov); | |
d7e09d03 PT |
548 | |
549 | frag_len = src->kiov_len - offset; | |
550 | dst->kiov_page = src->kiov_page; | |
551 | dst->kiov_offset = src->kiov_offset + offset; | |
552 | ||
553 | if (len <= frag_len) { | |
554 | dst->kiov_len = len; | |
ae4003f0 | 555 | LASSERT(dst->kiov_offset + dst->kiov_len |
c314c319 | 556 | <= PAGE_CACHE_SIZE); |
2b5f2e44 | 557 | return niov; |
d7e09d03 PT |
558 | } |
559 | ||
560 | dst->kiov_len = frag_len; | |
af66a6e2 | 561 | LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_CACHE_SIZE); |
d7e09d03 PT |
562 | |
563 | len -= frag_len; | |
564 | dst++; | |
565 | src++; | |
566 | niov++; | |
567 | src_niov--; | |
568 | offset = 0; | |
569 | } | |
570 | } | |
571 | EXPORT_SYMBOL(lnet_extract_kiov); | |
572 | ||
f526b20a | 573 | static void |
d7e09d03 PT |
574 | lnet_ni_recv(lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed, |
575 | unsigned int offset, unsigned int mlen, unsigned int rlen) | |
576 | { | |
7e7ab095 | 577 | unsigned int niov = 0; |
f351bad2 | 578 | struct kvec *iov = NULL; |
7e7ab095 MS |
579 | lnet_kiov_t *kiov = NULL; |
580 | int rc; | |
d7e09d03 | 581 | |
af66a6e2 | 582 | LASSERT(!in_interrupt()); |
5fd88337 | 583 | LASSERT(!mlen || msg); |
d7e09d03 | 584 | |
06ace26e | 585 | if (msg) { |
d7e09d03 PT |
586 | LASSERT(msg->msg_receiving); |
587 | LASSERT(!msg->msg_sending); | |
588 | LASSERT(rlen == msg->msg_len); | |
589 | LASSERT(mlen <= msg->msg_len); | |
590 | LASSERT(msg->msg_offset == offset); | |
591 | LASSERT(msg->msg_wanted == mlen); | |
592 | ||
593 | msg->msg_receiving = 0; | |
594 | ||
5fd88337 | 595 | if (mlen) { |
d7e09d03 PT |
596 | niov = msg->msg_niov; |
597 | iov = msg->msg_iov; | |
598 | kiov = msg->msg_kiov; | |
599 | ||
af66a6e2 | 600 | LASSERT(niov > 0); |
06ace26e | 601 | LASSERT(!iov != !kiov); |
d7e09d03 PT |
602 | } |
603 | } | |
604 | ||
0eee6778 JS |
605 | rc = ni->ni_lnd->lnd_recv(ni, private, msg, delayed, |
606 | niov, iov, kiov, offset, mlen, rlen); | |
d7e09d03 PT |
607 | if (rc < 0) |
608 | lnet_finalize(ni, msg, rc); | |
609 | } | |
610 | ||
f526b20a | 611 | static void |
d7e09d03 PT |
612 | lnet_setpayloadbuffer(lnet_msg_t *msg) |
613 | { | |
614 | lnet_libmd_t *md = msg->msg_md; | |
615 | ||
af66a6e2 LN |
616 | LASSERT(msg->msg_len > 0); |
617 | LASSERT(!msg->msg_routing); | |
06ace26e | 618 | LASSERT(md); |
5fd88337 | 619 | LASSERT(!msg->msg_niov); |
06ace26e JS |
620 | LASSERT(!msg->msg_iov); |
621 | LASSERT(!msg->msg_kiov); | |
d7e09d03 PT |
622 | |
623 | msg->msg_niov = md->md_niov; | |
5fd88337 | 624 | if (md->md_options & LNET_MD_KIOV) |
d7e09d03 PT |
625 | msg->msg_kiov = md->md_iov.kiov; |
626 | else | |
627 | msg->msg_iov = md->md_iov.iov; | |
628 | } | |
629 | ||
630 | void | |
631 | lnet_prep_send(lnet_msg_t *msg, int type, lnet_process_id_t target, | |
632 | unsigned int offset, unsigned int len) | |
633 | { | |
634 | msg->msg_type = type; | |
635 | msg->msg_target = target; | |
636 | msg->msg_len = len; | |
637 | msg->msg_offset = offset; | |
638 | ||
5fd88337 | 639 | if (len) |
d7e09d03 PT |
640 | lnet_setpayloadbuffer(msg); |
641 | ||
af66a6e2 | 642 | memset(&msg->msg_hdr, 0, sizeof(msg->msg_hdr)); |
d7e09d03 PT |
643 | msg->msg_hdr.type = cpu_to_le32(type); |
644 | msg->msg_hdr.dest_nid = cpu_to_le64(target.nid); | |
645 | msg->msg_hdr.dest_pid = cpu_to_le32(target.pid); | |
646 | /* src_nid will be set later */ | |
647 | msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid); | |
648 | msg->msg_hdr.payload_length = cpu_to_le32(len); | |
649 | } | |
650 | ||
f526b20a | 651 | static void |
d7e09d03 PT |
652 | lnet_ni_send(lnet_ni_t *ni, lnet_msg_t *msg) |
653 | { | |
7e7ab095 MS |
654 | void *priv = msg->msg_private; |
655 | int rc; | |
d7e09d03 | 656 | |
af66a6e2 LN |
657 | LASSERT(!in_interrupt()); |
658 | LASSERT(LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND || | |
c314c319 | 659 | (msg->msg_txcredit && msg->msg_peertxcredit)); |
d7e09d03 | 660 | |
0eee6778 | 661 | rc = ni->ni_lnd->lnd_send(ni, priv, msg); |
d7e09d03 PT |
662 | if (rc < 0) |
663 | lnet_finalize(ni, msg, rc); | |
664 | } | |
665 | ||
f526b20a | 666 | static int |
d7e09d03 PT |
667 | lnet_ni_eager_recv(lnet_ni_t *ni, lnet_msg_t *msg) |
668 | { | |
7e7ab095 | 669 | int rc; |
d7e09d03 PT |
670 | |
671 | LASSERT(!msg->msg_sending); | |
672 | LASSERT(msg->msg_receiving); | |
673 | LASSERT(!msg->msg_rx_ready_delay); | |
06ace26e | 674 | LASSERT(ni->ni_lnd->lnd_eager_recv); |
d7e09d03 PT |
675 | |
676 | msg->msg_rx_ready_delay = 1; | |
0eee6778 JS |
677 | rc = ni->ni_lnd->lnd_eager_recv(ni, msg->msg_private, msg, |
678 | &msg->msg_private); | |
5fd88337 | 679 | if (rc) { |
2d00bd17 | 680 | CERROR("recv from %s / send to %s aborted: eager_recv failed %d\n", |
d7e09d03 PT |
681 | libcfs_nid2str(msg->msg_rxpeer->lp_nid), |
682 | libcfs_id2str(msg->msg_target), rc); | |
683 | LASSERT(rc < 0); /* required by my callers */ | |
684 | } | |
685 | ||
686 | return rc; | |
687 | } | |
688 | ||
689 | /* NB: caller shall hold a ref on 'lp' as I'd drop lnet_net_lock */ | |
f526b20a | 690 | static void |
d7e09d03 PT |
691 | lnet_ni_query_locked(lnet_ni_t *ni, lnet_peer_t *lp) |
692 | { | |
a649ad1d | 693 | unsigned long last_alive = 0; |
d7e09d03 PT |
694 | |
695 | LASSERT(lnet_peer_aliveness_enabled(lp)); | |
06ace26e | 696 | LASSERT(ni->ni_lnd->lnd_query); |
d7e09d03 PT |
697 | |
698 | lnet_net_unlock(lp->lp_cpt); | |
0eee6778 | 699 | ni->ni_lnd->lnd_query(ni, lp->lp_nid, &last_alive); |
d7e09d03 PT |
700 | lnet_net_lock(lp->lp_cpt); |
701 | ||
702 | lp->lp_last_query = cfs_time_current(); | |
703 | ||
5fd88337 | 704 | if (last_alive) /* NI has updated timestamp */ |
d7e09d03 PT |
705 | lp->lp_last_alive = last_alive; |
706 | } | |
707 | ||
708 | /* NB: always called with lnet_net_lock held */ | |
709 | static inline int | |
a649ad1d | 710 | lnet_peer_is_alive(lnet_peer_t *lp, unsigned long now) |
d7e09d03 | 711 | { |
7e7ab095 | 712 | int alive; |
a649ad1d | 713 | unsigned long deadline; |
d7e09d03 | 714 | |
af66a6e2 | 715 | LASSERT(lnet_peer_aliveness_enabled(lp)); |
d7e09d03 PT |
716 | |
717 | /* Trust lnet_notify() if it has more recent aliveness news, but | |
718 | * ignore the initial assumed death (see lnet_peers_start_down()). | |
719 | */ | |
720 | if (!lp->lp_alive && lp->lp_alive_count > 0 && | |
721 | cfs_time_aftereq(lp->lp_timestamp, lp->lp_last_alive)) | |
722 | return 0; | |
723 | ||
724 | deadline = cfs_time_add(lp->lp_last_alive, | |
725 | cfs_time_seconds(lp->lp_ni->ni_peertimeout)); | |
726 | alive = cfs_time_after(deadline, now); | |
727 | ||
728 | /* Update obsolete lp_alive except for routers assumed to be dead | |
729 | * initially, because router checker would update aliveness in this | |
730 | * case, and moreover lp_last_alive at peer creation is assumed. | |
731 | */ | |
732 | if (alive && !lp->lp_alive && | |
5fd88337 | 733 | !(lnet_isrouter(lp) && !lp->lp_alive_count)) |
d7e09d03 PT |
734 | lnet_notify_locked(lp, 0, 1, lp->lp_last_alive); |
735 | ||
736 | return alive; | |
737 | } | |
738 | ||
4420cfd3 JS |
739 | /* |
740 | * NB: returns 1 when alive, 0 when dead, negative when error; | |
741 | * may drop the lnet_net_lock | |
742 | */ | |
f526b20a | 743 | static int |
af66a6e2 | 744 | lnet_peer_alive_locked(lnet_peer_t *lp) |
d7e09d03 | 745 | { |
a649ad1d | 746 | unsigned long now = cfs_time_current(); |
d7e09d03 PT |
747 | |
748 | if (!lnet_peer_aliveness_enabled(lp)) | |
749 | return -ENODEV; | |
750 | ||
751 | if (lnet_peer_is_alive(lp, now)) | |
752 | return 1; | |
753 | ||
4420cfd3 JS |
754 | /* |
755 | * Peer appears dead, but we should avoid frequent NI queries (at | |
756 | * most once per lnet_queryinterval seconds). | |
757 | */ | |
5fd88337 | 758 | if (lp->lp_last_query) { |
d7e09d03 PT |
759 | static const int lnet_queryinterval = 1; |
760 | ||
a649ad1d | 761 | unsigned long next_query = |
d7e09d03 PT |
762 | cfs_time_add(lp->lp_last_query, |
763 | cfs_time_seconds(lnet_queryinterval)); | |
764 | ||
699503bc | 765 | if (time_before(now, next_query)) { |
d7e09d03 | 766 | if (lp->lp_alive) |
2d00bd17 | 767 | CWARN("Unexpected aliveness of peer %s: %d < %d (%d/%d)\n", |
d7e09d03 PT |
768 | libcfs_nid2str(lp->lp_nid), |
769 | (int)now, (int)next_query, | |
770 | lnet_queryinterval, | |
771 | lp->lp_ni->ni_peertimeout); | |
772 | return 0; | |
773 | } | |
774 | } | |
775 | ||
776 | /* query NI for latest aliveness news */ | |
777 | lnet_ni_query_locked(lp->lp_ni, lp); | |
778 | ||
779 | if (lnet_peer_is_alive(lp, now)) | |
780 | return 1; | |
781 | ||
782 | lnet_notify_locked(lp, 0, 0, lp->lp_last_alive); | |
783 | return 0; | |
784 | } | |
785 | ||
dee2857e IH |
786 | /** |
787 | * \param msg The message to be sent. | |
788 | * \param do_send True if lnet_ni_send() should be called in this function. | |
789 | * lnet_send() is going to lnet_net_unlock immediately after this, so | |
790 | * it sets do_send FALSE and I don't do the unlock/send/lock bit. | |
791 | * | |
ec5fb5be LZ |
792 | * \retval LNET_CREDIT_OK If \a msg sent or OK to send. |
793 | * \retval LNET_CREDIT_WAIT If \a msg blocked for credit. | |
794 | * \retval -EHOSTUNREACH If the next hop of the message appears dead. | |
795 | * \retval -ECANCELED If the MD of the message has been unlinked. | |
dee2857e IH |
796 | */ |
797 | static int | |
d7e09d03 PT |
798 | lnet_post_send_locked(lnet_msg_t *msg, int do_send) |
799 | { | |
7e7ab095 MS |
800 | lnet_peer_t *lp = msg->msg_txpeer; |
801 | lnet_ni_t *ni = lp->lp_ni; | |
802 | int cpt = msg->msg_tx_cpt; | |
803 | struct lnet_tx_queue *tq = ni->ni_tx_queues[cpt]; | |
d7e09d03 PT |
804 | |
805 | /* non-lnet_send() callers have checked before */ | |
806 | LASSERT(!do_send || msg->msg_tx_delayed); | |
807 | LASSERT(!msg->msg_receiving); | |
808 | LASSERT(msg->msg_tx_committed); | |
809 | ||
d7e09d03 | 810 | /* NB 'lp' is always the next hop */ |
5fd88337 JS |
811 | if (!(msg->msg_target.pid & LNET_PID_USERFLAG) && |
812 | !lnet_peer_alive_locked(lp)) { | |
d7e09d03 PT |
813 | the_lnet.ln_counters[cpt]->drop_count++; |
814 | the_lnet.ln_counters[cpt]->drop_length += msg->msg_len; | |
815 | lnet_net_unlock(cpt); | |
816 | ||
817 | CNETERR("Dropping message for %s: peer not alive\n", | |
818 | libcfs_id2str(msg->msg_target)); | |
819 | if (do_send) | |
820 | lnet_finalize(ni, msg, -EHOSTUNREACH); | |
821 | ||
822 | lnet_net_lock(cpt); | |
ec5fb5be | 823 | return -EHOSTUNREACH; |
d7e09d03 PT |
824 | } |
825 | ||
06ace26e | 826 | if (msg->msg_md && |
5fd88337 | 827 | (msg->msg_md->md_flags & LNET_MD_FLAG_ABORTED)) { |
dee2857e IH |
828 | lnet_net_unlock(cpt); |
829 | ||
2d00bd17 | 830 | CNETERR("Aborting message for %s: LNetM[DE]Unlink() already called on the MD/ME.\n", |
dee2857e IH |
831 | libcfs_id2str(msg->msg_target)); |
832 | if (do_send) | |
833 | lnet_finalize(ni, msg, -ECANCELED); | |
834 | ||
835 | lnet_net_lock(cpt); | |
ec5fb5be | 836 | return -ECANCELED; |
dee2857e IH |
837 | } |
838 | ||
d7e09d03 | 839 | if (!msg->msg_peertxcredit) { |
af66a6e2 | 840 | LASSERT((lp->lp_txcredits < 0) == |
c314c319 | 841 | !list_empty(&lp->lp_txq)); |
d7e09d03 PT |
842 | |
843 | msg->msg_peertxcredit = 1; | |
844 | lp->lp_txqnob += msg->msg_len + sizeof(lnet_hdr_t); | |
845 | lp->lp_txcredits--; | |
846 | ||
847 | if (lp->lp_txcredits < lp->lp_mintxcredits) | |
848 | lp->lp_mintxcredits = lp->lp_txcredits; | |
849 | ||
850 | if (lp->lp_txcredits < 0) { | |
851 | msg->msg_tx_delayed = 1; | |
852 | list_add_tail(&msg->msg_list, &lp->lp_txq); | |
ec5fb5be | 853 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
854 | } |
855 | } | |
856 | ||
857 | if (!msg->msg_txcredit) { | |
858 | LASSERT((tq->tq_credits < 0) == | |
859 | !list_empty(&tq->tq_delayed)); | |
860 | ||
861 | msg->msg_txcredit = 1; | |
862 | tq->tq_credits--; | |
863 | ||
864 | if (tq->tq_credits < tq->tq_credits_min) | |
865 | tq->tq_credits_min = tq->tq_credits; | |
866 | ||
867 | if (tq->tq_credits < 0) { | |
868 | msg->msg_tx_delayed = 1; | |
869 | list_add_tail(&msg->msg_list, &tq->tq_delayed); | |
ec5fb5be | 870 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
871 | } |
872 | } | |
873 | ||
874 | if (do_send) { | |
875 | lnet_net_unlock(cpt); | |
876 | lnet_ni_send(ni, msg); | |
877 | lnet_net_lock(cpt); | |
878 | } | |
ec5fb5be | 879 | return LNET_CREDIT_OK; |
d7e09d03 PT |
880 | } |
881 | ||
f526b20a | 882 | static lnet_rtrbufpool_t * |
d7e09d03 PT |
883 | lnet_msg2bufpool(lnet_msg_t *msg) |
884 | { | |
7e7ab095 MS |
885 | lnet_rtrbufpool_t *rbp; |
886 | int cpt; | |
d7e09d03 PT |
887 | |
888 | LASSERT(msg->msg_rx_committed); | |
889 | ||
890 | cpt = msg->msg_rx_cpt; | |
891 | rbp = &the_lnet.ln_rtrpools[cpt][0]; | |
892 | ||
893 | LASSERT(msg->msg_len <= LNET_MTU); | |
894 | while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_CACHE_SIZE) { | |
895 | rbp++; | |
896 | LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]); | |
897 | } | |
898 | ||
899 | return rbp; | |
900 | } | |
901 | ||
f526b20a | 902 | static int |
af66a6e2 | 903 | lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv) |
d7e09d03 | 904 | { |
4420cfd3 JS |
905 | /* |
906 | * lnet_parse is going to lnet_net_unlock immediately after this, so it | |
ec5fb5be LZ |
907 | * sets do_recv FALSE and I don't do the unlock/send/lock bit. |
908 | * I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if | |
909 | * received or OK to receive | |
4420cfd3 | 910 | */ |
7e7ab095 MS |
911 | lnet_peer_t *lp = msg->msg_rxpeer; |
912 | lnet_rtrbufpool_t *rbp; | |
913 | lnet_rtrbuf_t *rb; | |
d7e09d03 | 914 | |
06ace26e JS |
915 | LASSERT(!msg->msg_iov); |
916 | LASSERT(!msg->msg_kiov); | |
5fd88337 | 917 | LASSERT(!msg->msg_niov); |
af66a6e2 LN |
918 | LASSERT(msg->msg_routing); |
919 | LASSERT(msg->msg_receiving); | |
920 | LASSERT(!msg->msg_sending); | |
d7e09d03 PT |
921 | |
922 | /* non-lnet_parse callers only receive delayed messages */ | |
923 | LASSERT(!do_recv || msg->msg_rx_delayed); | |
924 | ||
925 | if (!msg->msg_peerrtrcredit) { | |
af66a6e2 | 926 | LASSERT((lp->lp_rtrcredits < 0) == |
c314c319 | 927 | !list_empty(&lp->lp_rtrq)); |
d7e09d03 PT |
928 | |
929 | msg->msg_peerrtrcredit = 1; | |
930 | lp->lp_rtrcredits--; | |
931 | if (lp->lp_rtrcredits < lp->lp_minrtrcredits) | |
932 | lp->lp_minrtrcredits = lp->lp_rtrcredits; | |
933 | ||
934 | if (lp->lp_rtrcredits < 0) { | |
935 | /* must have checked eager_recv before here */ | |
936 | LASSERT(msg->msg_rx_ready_delay); | |
937 | msg->msg_rx_delayed = 1; | |
938 | list_add_tail(&msg->msg_list, &lp->lp_rtrq); | |
ec5fb5be | 939 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
940 | } |
941 | } | |
942 | ||
943 | rbp = lnet_msg2bufpool(msg); | |
944 | ||
945 | if (!msg->msg_rtrcredit) { | |
d7e09d03 PT |
946 | msg->msg_rtrcredit = 1; |
947 | rbp->rbp_credits--; | |
948 | if (rbp->rbp_credits < rbp->rbp_mincredits) | |
949 | rbp->rbp_mincredits = rbp->rbp_credits; | |
950 | ||
951 | if (rbp->rbp_credits < 0) { | |
952 | /* must have checked eager_recv before here */ | |
953 | LASSERT(msg->msg_rx_ready_delay); | |
954 | msg->msg_rx_delayed = 1; | |
955 | list_add_tail(&msg->msg_list, &rbp->rbp_msgs); | |
ec5fb5be | 956 | return LNET_CREDIT_WAIT; |
d7e09d03 PT |
957 | } |
958 | } | |
959 | ||
af66a6e2 | 960 | LASSERT(!list_empty(&rbp->rbp_bufs)); |
d7e09d03 PT |
961 | rb = list_entry(rbp->rbp_bufs.next, lnet_rtrbuf_t, rb_list); |
962 | list_del(&rb->rb_list); | |
963 | ||
964 | msg->msg_niov = rbp->rbp_npages; | |
965 | msg->msg_kiov = &rb->rb_kiov[0]; | |
966 | ||
967 | if (do_recv) { | |
968 | int cpt = msg->msg_rx_cpt; | |
969 | ||
970 | lnet_net_unlock(cpt); | |
971 | lnet_ni_recv(lp->lp_ni, msg->msg_private, msg, 1, | |
972 | 0, msg->msg_len, msg->msg_len); | |
973 | lnet_net_lock(cpt); | |
974 | } | |
ec5fb5be | 975 | return LNET_CREDIT_OK; |
d7e09d03 PT |
976 | } |
977 | ||
978 | void | |
979 | lnet_return_tx_credits_locked(lnet_msg_t *msg) | |
980 | { | |
7e7ab095 MS |
981 | lnet_peer_t *txpeer = msg->msg_txpeer; |
982 | lnet_msg_t *msg2; | |
d7e09d03 PT |
983 | |
984 | if (msg->msg_txcredit) { | |
7e7ab095 | 985 | struct lnet_ni *ni = txpeer->lp_ni; |
d7e09d03 PT |
986 | struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt]; |
987 | ||
988 | /* give back NI txcredits */ | |
989 | msg->msg_txcredit = 0; | |
990 | ||
991 | LASSERT((tq->tq_credits < 0) == | |
992 | !list_empty(&tq->tq_delayed)); | |
993 | ||
994 | tq->tq_credits++; | |
995 | if (tq->tq_credits <= 0) { | |
996 | msg2 = list_entry(tq->tq_delayed.next, | |
c314c319 | 997 | lnet_msg_t, msg_list); |
d7e09d03 PT |
998 | list_del(&msg2->msg_list); |
999 | ||
1000 | LASSERT(msg2->msg_txpeer->lp_ni == ni); | |
1001 | LASSERT(msg2->msg_tx_delayed); | |
1002 | ||
1003 | (void) lnet_post_send_locked(msg2, 1); | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | if (msg->msg_peertxcredit) { | |
1008 | /* give back peer txcredits */ | |
1009 | msg->msg_peertxcredit = 0; | |
1010 | ||
1011 | LASSERT((txpeer->lp_txcredits < 0) == | |
1012 | !list_empty(&txpeer->lp_txq)); | |
1013 | ||
1014 | txpeer->lp_txqnob -= msg->msg_len + sizeof(lnet_hdr_t); | |
af66a6e2 | 1015 | LASSERT(txpeer->lp_txqnob >= 0); |
d7e09d03 PT |
1016 | |
1017 | txpeer->lp_txcredits++; | |
1018 | if (txpeer->lp_txcredits <= 0) { | |
1019 | msg2 = list_entry(txpeer->lp_txq.next, | |
c314c319 | 1020 | lnet_msg_t, msg_list); |
d7e09d03 PT |
1021 | list_del(&msg2->msg_list); |
1022 | ||
1023 | LASSERT(msg2->msg_txpeer == txpeer); | |
1024 | LASSERT(msg2->msg_tx_delayed); | |
1025 | ||
1026 | (void) lnet_post_send_locked(msg2, 1); | |
1027 | } | |
1028 | } | |
1029 | ||
06ace26e | 1030 | if (txpeer) { |
d7e09d03 PT |
1031 | msg->msg_txpeer = NULL; |
1032 | lnet_peer_decref_locked(txpeer); | |
1033 | } | |
1034 | } | |
1035 | ||
86ef6250 AS |
1036 | void |
1037 | lnet_schedule_blocked_locked(lnet_rtrbufpool_t *rbp) | |
1038 | { | |
1039 | lnet_msg_t *msg; | |
1040 | ||
1041 | if (list_empty(&rbp->rbp_msgs)) | |
1042 | return; | |
1043 | msg = list_entry(rbp->rbp_msgs.next, | |
1044 | lnet_msg_t, msg_list); | |
1045 | list_del(&msg->msg_list); | |
1046 | ||
1047 | (void)lnet_post_routed_recv_locked(msg, 1); | |
1048 | } | |
1049 | ||
1050 | void | |
1051 | lnet_drop_routed_msgs_locked(struct list_head *list, int cpt) | |
1052 | { | |
1053 | struct list_head drop; | |
1054 | lnet_msg_t *msg; | |
1055 | lnet_msg_t *tmp; | |
1056 | ||
1057 | INIT_LIST_HEAD(&drop); | |
1058 | ||
1059 | list_splice_init(list, &drop); | |
1060 | ||
1061 | lnet_net_unlock(cpt); | |
1062 | ||
1063 | list_for_each_entry_safe(msg, tmp, &drop, msg_list) { | |
1064 | lnet_ni_recv(msg->msg_rxpeer->lp_ni, msg->msg_private, NULL, | |
1065 | 0, 0, 0, msg->msg_hdr.payload_length); | |
1066 | list_del_init(&msg->msg_list); | |
1067 | lnet_finalize(NULL, msg, -ECANCELED); | |
1068 | } | |
1069 | ||
1070 | lnet_net_lock(cpt); | |
1071 | } | |
1072 | ||
d7e09d03 PT |
1073 | void |
1074 | lnet_return_rx_credits_locked(lnet_msg_t *msg) | |
1075 | { | |
7e7ab095 MS |
1076 | lnet_peer_t *rxpeer = msg->msg_rxpeer; |
1077 | lnet_msg_t *msg2; | |
d7e09d03 PT |
1078 | |
1079 | if (msg->msg_rtrcredit) { | |
1080 | /* give back global router credits */ | |
7e7ab095 | 1081 | lnet_rtrbuf_t *rb; |
d7e09d03 PT |
1082 | lnet_rtrbufpool_t *rbp; |
1083 | ||
4420cfd3 JS |
1084 | /* |
1085 | * NB If a msg ever blocks for a buffer in rbp_msgs, it stays | |
d7e09d03 | 1086 | * there until it gets one allocated, or aborts the wait |
4420cfd3 JS |
1087 | * itself |
1088 | */ | |
06ace26e | 1089 | LASSERT(msg->msg_kiov); |
d7e09d03 PT |
1090 | |
1091 | rb = list_entry(msg->msg_kiov, lnet_rtrbuf_t, rb_kiov[0]); | |
1092 | rbp = rb->rb_pool; | |
d7e09d03 PT |
1093 | |
1094 | msg->msg_kiov = NULL; | |
1095 | msg->msg_rtrcredit = 0; | |
1096 | ||
86ef6250 AS |
1097 | LASSERT(rbp == lnet_msg2bufpool(msg)); |
1098 | ||
d7e09d03 PT |
1099 | LASSERT((rbp->rbp_credits > 0) == |
1100 | !list_empty(&rbp->rbp_bufs)); | |
1101 | ||
86ef6250 AS |
1102 | /* |
1103 | * If routing is now turned off, we just drop this buffer and | |
1104 | * don't bother trying to return credits. | |
1105 | */ | |
1106 | if (!the_lnet.ln_routing) { | |
1107 | lnet_destroy_rtrbuf(rb, rbp->rbp_npages); | |
1108 | goto routing_off; | |
1109 | } | |
d7e09d03 | 1110 | |
86ef6250 AS |
1111 | /* |
1112 | * It is possible that a user has lowered the desired number of | |
1113 | * buffers in this pool. Make sure we never put back | |
1114 | * more buffers than the stated number. | |
1115 | */ | |
95fc2938 | 1116 | if (unlikely(rbp->rbp_credits >= rbp->rbp_req_nbuffers)) { |
86ef6250 AS |
1117 | /* Discard this buffer so we don't have too many. */ |
1118 | lnet_destroy_rtrbuf(rb, rbp->rbp_npages); | |
95fc2938 | 1119 | rbp->rbp_nbuffers--; |
86ef6250 AS |
1120 | } else { |
1121 | list_add(&rb->rb_list, &rbp->rbp_bufs); | |
1122 | rbp->rbp_credits++; | |
1123 | if (rbp->rbp_credits <= 0) | |
1124 | lnet_schedule_blocked_locked(rbp); | |
d7e09d03 PT |
1125 | } |
1126 | } | |
1127 | ||
86ef6250 | 1128 | routing_off: |
d7e09d03 PT |
1129 | if (msg->msg_peerrtrcredit) { |
1130 | /* give back peer router credits */ | |
1131 | msg->msg_peerrtrcredit = 0; | |
1132 | ||
1133 | LASSERT((rxpeer->lp_rtrcredits < 0) == | |
1134 | !list_empty(&rxpeer->lp_rtrq)); | |
1135 | ||
1136 | rxpeer->lp_rtrcredits++; | |
86ef6250 AS |
1137 | /* |
1138 | * drop all messages which are queued to be routed on that | |
1139 | * peer. | |
1140 | */ | |
1141 | if (!the_lnet.ln_routing) { | |
1142 | lnet_drop_routed_msgs_locked(&rxpeer->lp_rtrq, | |
1143 | msg->msg_rx_cpt); | |
1144 | } else if (rxpeer->lp_rtrcredits <= 0) { | |
d7e09d03 | 1145 | msg2 = list_entry(rxpeer->lp_rtrq.next, |
c314c319 | 1146 | lnet_msg_t, msg_list); |
d7e09d03 PT |
1147 | list_del(&msg2->msg_list); |
1148 | ||
1149 | (void) lnet_post_routed_recv_locked(msg2, 1); | |
1150 | } | |
1151 | } | |
06ace26e | 1152 | if (rxpeer) { |
d7e09d03 PT |
1153 | msg->msg_rxpeer = NULL; |
1154 | lnet_peer_decref_locked(rxpeer); | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | static int | |
1159 | lnet_compare_routes(lnet_route_t *r1, lnet_route_t *r2) | |
1160 | { | |
1161 | lnet_peer_t *p1 = r1->lr_gateway; | |
1162 | lnet_peer_t *p2 = r2->lr_gateway; | |
1163 | ||
e75fb87f DO |
1164 | if (r1->lr_priority < r2->lr_priority) |
1165 | return 1; | |
1166 | ||
1167 | if (r1->lr_priority > r2->lr_priority) | |
1168 | return -1; | |
1169 | ||
d7e09d03 PT |
1170 | if (r1->lr_hops < r2->lr_hops) |
1171 | return 1; | |
1172 | ||
1173 | if (r1->lr_hops > r2->lr_hops) | |
1174 | return -1; | |
1175 | ||
1176 | if (p1->lp_txqnob < p2->lp_txqnob) | |
1177 | return 1; | |
1178 | ||
1179 | if (p1->lp_txqnob > p2->lp_txqnob) | |
1180 | return -1; | |
1181 | ||
1182 | if (p1->lp_txcredits > p2->lp_txcredits) | |
1183 | return 1; | |
1184 | ||
1185 | if (p1->lp_txcredits < p2->lp_txcredits) | |
1186 | return -1; | |
1187 | ||
1188 | if (r1->lr_seq - r2->lr_seq <= 0) | |
1189 | return 1; | |
1190 | ||
1191 | return -1; | |
1192 | } | |
1193 | ||
1194 | static lnet_peer_t * | |
1195 | lnet_find_route_locked(lnet_ni_t *ni, lnet_nid_t target, lnet_nid_t rtr_nid) | |
1196 | { | |
7e7ab095 | 1197 | lnet_remotenet_t *rnet; |
4f0bedec CH |
1198 | lnet_route_t *route; |
1199 | lnet_route_t *best_route; | |
1200 | lnet_route_t *last_route; | |
7e7ab095 MS |
1201 | struct lnet_peer *lp_best; |
1202 | struct lnet_peer *lp; | |
1203 | int rc; | |
d7e09d03 | 1204 | |
4420cfd3 JS |
1205 | /* |
1206 | * If @rtr_nid is not LNET_NID_ANY, return the gateway with | |
1207 | * rtr_nid nid, otherwise find the best gateway I can use | |
1208 | */ | |
d7e09d03 | 1209 | rnet = lnet_find_net_locked(LNET_NIDNET(target)); |
06ace26e | 1210 | if (!rnet) |
d7e09d03 PT |
1211 | return NULL; |
1212 | ||
1213 | lp_best = NULL; | |
4f0bedec CH |
1214 | best_route = NULL; |
1215 | last_route = NULL; | |
1216 | list_for_each_entry(route, &rnet->lrn_routes, lr_list) { | |
1217 | lp = route->lr_gateway; | |
d7e09d03 | 1218 | |
4ee23a84 | 1219 | if (!lnet_is_route_alive(route)) |
d7e09d03 PT |
1220 | continue; |
1221 | ||
06ace26e | 1222 | if (ni && lp->lp_ni != ni) |
d7e09d03 PT |
1223 | continue; |
1224 | ||
1225 | if (lp->lp_nid == rtr_nid) /* it's pre-determined router */ | |
1226 | return lp; | |
1227 | ||
06ace26e | 1228 | if (!lp_best) { |
4f0bedec CH |
1229 | best_route = route; |
1230 | last_route = route; | |
d7e09d03 PT |
1231 | lp_best = lp; |
1232 | continue; | |
1233 | } | |
1234 | ||
1235 | /* no protection on below fields, but it's harmless */ | |
4f0bedec CH |
1236 | if (last_route->lr_seq - route->lr_seq < 0) |
1237 | last_route = route; | |
d7e09d03 | 1238 | |
4f0bedec | 1239 | rc = lnet_compare_routes(route, best_route); |
d7e09d03 PT |
1240 | if (rc < 0) |
1241 | continue; | |
1242 | ||
4f0bedec | 1243 | best_route = route; |
d7e09d03 PT |
1244 | lp_best = lp; |
1245 | } | |
1246 | ||
4420cfd3 JS |
1247 | /* |
1248 | * set sequence number on the best router to the latest sequence + 1 | |
d7e09d03 | 1249 | * so we can round-robin all routers, it's race and inaccurate but |
4420cfd3 JS |
1250 | * harmless and functional |
1251 | */ | |
4f0bedec CH |
1252 | if (best_route) |
1253 | best_route->lr_seq = last_route->lr_seq + 1; | |
d7e09d03 PT |
1254 | return lp_best; |
1255 | } | |
1256 | ||
1257 | int | |
1258 | lnet_send(lnet_nid_t src_nid, lnet_msg_t *msg, lnet_nid_t rtr_nid) | |
1259 | { | |
7e7ab095 MS |
1260 | lnet_nid_t dst_nid = msg->msg_target.nid; |
1261 | struct lnet_ni *src_ni; | |
1262 | struct lnet_ni *local_ni; | |
1263 | struct lnet_peer *lp; | |
1264 | int cpt; | |
1265 | int cpt2; | |
1266 | int rc; | |
d7e09d03 | 1267 | |
4420cfd3 JS |
1268 | /* |
1269 | * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases, | |
d7e09d03 | 1270 | * but we might want to use pre-determined router for ACK/REPLY |
4420cfd3 JS |
1271 | * in the future |
1272 | */ | |
06ace26e JS |
1273 | /* NB: ni == interface pre-determined (ACK/REPLY) */ |
1274 | LASSERT(!msg->msg_txpeer); | |
af66a6e2 LN |
1275 | LASSERT(!msg->msg_sending); |
1276 | LASSERT(!msg->msg_target_is_router); | |
1277 | LASSERT(!msg->msg_receiving); | |
d7e09d03 PT |
1278 | |
1279 | msg->msg_sending = 1; | |
1280 | ||
1281 | LASSERT(!msg->msg_tx_committed); | |
1282 | cpt = lnet_cpt_of_nid(rtr_nid == LNET_NID_ANY ? dst_nid : rtr_nid); | |
1283 | again: | |
1284 | lnet_net_lock(cpt); | |
1285 | ||
1286 | if (the_lnet.ln_shutdown) { | |
1287 | lnet_net_unlock(cpt); | |
1288 | return -ESHUTDOWN; | |
1289 | } | |
1290 | ||
1291 | if (src_nid == LNET_NID_ANY) { | |
1292 | src_ni = NULL; | |
1293 | } else { | |
1294 | src_ni = lnet_nid2ni_locked(src_nid, cpt); | |
06ace26e | 1295 | if (!src_ni) { |
d7e09d03 | 1296 | lnet_net_unlock(cpt); |
2d00bd17 JP |
1297 | LCONSOLE_WARN("Can't send to %s: src %s is not a local nid\n", |
1298 | libcfs_nid2str(dst_nid), | |
d7e09d03 PT |
1299 | libcfs_nid2str(src_nid)); |
1300 | return -EINVAL; | |
1301 | } | |
af66a6e2 | 1302 | LASSERT(!msg->msg_routing); |
d7e09d03 PT |
1303 | } |
1304 | ||
1305 | /* Is this for someone on a local network? */ | |
1306 | local_ni = lnet_net2ni_locked(LNET_NIDNET(dst_nid), cpt); | |
1307 | ||
06ace26e JS |
1308 | if (local_ni) { |
1309 | if (!src_ni) { | |
d7e09d03 PT |
1310 | src_ni = local_ni; |
1311 | src_nid = src_ni->ni_nid; | |
1312 | } else if (src_ni == local_ni) { | |
1313 | lnet_ni_decref_locked(local_ni, cpt); | |
1314 | } else { | |
1315 | lnet_ni_decref_locked(local_ni, cpt); | |
1316 | lnet_ni_decref_locked(src_ni, cpt); | |
1317 | lnet_net_unlock(cpt); | |
1318 | LCONSOLE_WARN("No route to %s via from %s\n", | |
1319 | libcfs_nid2str(dst_nid), | |
1320 | libcfs_nid2str(src_nid)); | |
1321 | return -EINVAL; | |
1322 | } | |
1323 | ||
1324 | LASSERT(src_nid != LNET_NID_ANY); | |
1325 | lnet_msg_commit(msg, cpt); | |
1326 | ||
1327 | if (!msg->msg_routing) | |
1328 | msg->msg_hdr.src_nid = cpu_to_le64(src_nid); | |
1329 | ||
1330 | if (src_ni == the_lnet.ln_loni) { | |
1331 | /* No send credit hassles with LOLND */ | |
1332 | lnet_net_unlock(cpt); | |
1333 | lnet_ni_send(src_ni, msg); | |
1334 | ||
1335 | lnet_net_lock(cpt); | |
1336 | lnet_ni_decref_locked(src_ni, cpt); | |
1337 | lnet_net_unlock(cpt); | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | rc = lnet_nid2peer_locked(&lp, dst_nid, cpt); | |
1342 | /* lp has ref on src_ni; lose mine */ | |
1343 | lnet_ni_decref_locked(src_ni, cpt); | |
5fd88337 | 1344 | if (rc) { |
d7e09d03 PT |
1345 | lnet_net_unlock(cpt); |
1346 | LCONSOLE_WARN("Error %d finding peer %s\n", rc, | |
1347 | libcfs_nid2str(dst_nid)); | |
1348 | /* ENOMEM or shutting down */ | |
1349 | return rc; | |
1350 | } | |
af66a6e2 | 1351 | LASSERT(lp->lp_ni == src_ni); |
d7e09d03 PT |
1352 | } else { |
1353 | /* sending to a remote network */ | |
1354 | lp = lnet_find_route_locked(src_ni, dst_nid, rtr_nid); | |
06ace26e JS |
1355 | if (!lp) { |
1356 | if (src_ni) | |
d7e09d03 PT |
1357 | lnet_ni_decref_locked(src_ni, cpt); |
1358 | lnet_net_unlock(cpt); | |
1359 | ||
2d00bd17 | 1360 | LCONSOLE_WARN("No route to %s via %s (all routers down)\n", |
d7e09d03 PT |
1361 | libcfs_id2str(msg->msg_target), |
1362 | libcfs_nid2str(src_nid)); | |
1363 | return -EHOSTUNREACH; | |
1364 | } | |
1365 | ||
4420cfd3 JS |
1366 | /* |
1367 | * rtr_nid is LNET_NID_ANY or NID of pre-determined router, | |
d7e09d03 PT |
1368 | * it's possible that rtr_nid isn't LNET_NID_ANY and lp isn't |
1369 | * pre-determined router, this can happen if router table | |
4420cfd3 JS |
1370 | * was changed when we release the lock |
1371 | */ | |
d7e09d03 PT |
1372 | if (rtr_nid != lp->lp_nid) { |
1373 | cpt2 = lnet_cpt_of_nid_locked(lp->lp_nid); | |
1374 | if (cpt2 != cpt) { | |
06ace26e | 1375 | if (src_ni) |
d7e09d03 PT |
1376 | lnet_ni_decref_locked(src_ni, cpt); |
1377 | lnet_net_unlock(cpt); | |
1378 | ||
1379 | rtr_nid = lp->lp_nid; | |
1380 | cpt = cpt2; | |
1381 | goto again; | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | CDEBUG(D_NET, "Best route to %s via %s for %s %d\n", | |
1386 | libcfs_nid2str(dst_nid), libcfs_nid2str(lp->lp_nid), | |
1387 | lnet_msgtyp2str(msg->msg_type), msg->msg_len); | |
1388 | ||
06ace26e | 1389 | if (!src_ni) { |
d7e09d03 PT |
1390 | src_ni = lp->lp_ni; |
1391 | src_nid = src_ni->ni_nid; | |
1392 | } else { | |
af66a6e2 | 1393 | LASSERT(src_ni == lp->lp_ni); |
d7e09d03 PT |
1394 | lnet_ni_decref_locked(src_ni, cpt); |
1395 | } | |
1396 | ||
1397 | lnet_peer_addref_locked(lp); | |
1398 | ||
1399 | LASSERT(src_nid != LNET_NID_ANY); | |
1400 | lnet_msg_commit(msg, cpt); | |
1401 | ||
1402 | if (!msg->msg_routing) { | |
1403 | /* I'm the source and now I know which NI to send on */ | |
1404 | msg->msg_hdr.src_nid = cpu_to_le64(src_nid); | |
1405 | } | |
1406 | ||
1407 | msg->msg_target_is_router = 1; | |
1408 | msg->msg_target.nid = lp->lp_nid; | |
fe7cb65d | 1409 | msg->msg_target.pid = LNET_PID_LUSTRE; |
d7e09d03 PT |
1410 | } |
1411 | ||
1412 | /* 'lp' is our best choice of peer */ | |
1413 | ||
af66a6e2 LN |
1414 | LASSERT(!msg->msg_peertxcredit); |
1415 | LASSERT(!msg->msg_txcredit); | |
06ace26e | 1416 | LASSERT(!msg->msg_txpeer); |
d7e09d03 PT |
1417 | |
1418 | msg->msg_txpeer = lp; /* msg takes my ref on lp */ | |
1419 | ||
1420 | rc = lnet_post_send_locked(msg, 0); | |
1421 | lnet_net_unlock(cpt); | |
1422 | ||
ec5fb5be LZ |
1423 | if (rc < 0) |
1424 | return rc; | |
d7e09d03 | 1425 | |
ec5fb5be | 1426 | if (rc == LNET_CREDIT_OK) |
d7e09d03 PT |
1427 | lnet_ni_send(src_ni, msg); |
1428 | ||
ec5fb5be | 1429 | return 0; /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT */ |
d7e09d03 PT |
1430 | } |
1431 | ||
1432 | static void | |
1433 | lnet_drop_message(lnet_ni_t *ni, int cpt, void *private, unsigned int nob) | |
1434 | { | |
1435 | lnet_net_lock(cpt); | |
1436 | the_lnet.ln_counters[cpt]->drop_count++; | |
1437 | the_lnet.ln_counters[cpt]->drop_length += nob; | |
1438 | lnet_net_unlock(cpt); | |
1439 | ||
1440 | lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob); | |
1441 | } | |
1442 | ||
1443 | static void | |
1444 | lnet_recv_put(lnet_ni_t *ni, lnet_msg_t *msg) | |
1445 | { | |
7e7ab095 | 1446 | lnet_hdr_t *hdr = &msg->msg_hdr; |
d7e09d03 | 1447 | |
5fd88337 | 1448 | if (msg->msg_wanted) |
d7e09d03 PT |
1449 | lnet_setpayloadbuffer(msg); |
1450 | ||
1451 | lnet_build_msg_event(msg, LNET_EVENT_PUT); | |
1452 | ||
4420cfd3 JS |
1453 | /* |
1454 | * Must I ACK? If so I'll grab the ack_wmd out of the header and put | |
1455 | * it back into the ACK during lnet_finalize() | |
1456 | */ | |
5fd88337 JS |
1457 | msg->msg_ack = !lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) && |
1458 | !(msg->msg_md->md_options & LNET_MD_ACK_DISABLE); | |
d7e09d03 PT |
1459 | |
1460 | lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed, | |
1461 | msg->msg_offset, msg->msg_wanted, hdr->payload_length); | |
1462 | } | |
1463 | ||
1464 | static int | |
1465 | lnet_parse_put(lnet_ni_t *ni, lnet_msg_t *msg) | |
1466 | { | |
7e7ab095 MS |
1467 | lnet_hdr_t *hdr = &msg->msg_hdr; |
1468 | struct lnet_match_info info; | |
1469 | int rc; | |
d7e09d03 PT |
1470 | |
1471 | /* Convert put fields to host byte order */ | |
1472 | hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits); | |
1473 | hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index); | |
1474 | hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset); | |
1475 | ||
1476 | info.mi_id.nid = hdr->src_nid; | |
1477 | info.mi_id.pid = hdr->src_pid; | |
1478 | info.mi_opc = LNET_MD_OP_PUT; | |
1479 | info.mi_portal = hdr->msg.put.ptl_index; | |
1480 | info.mi_rlength = hdr->payload_length; | |
1481 | info.mi_roffset = hdr->msg.put.offset; | |
1482 | info.mi_mbits = hdr->msg.put.match_bits; | |
1483 | ||
06ace26e | 1484 | msg->msg_rx_ready_delay = !ni->ni_lnd->lnd_eager_recv; |
d7e09d03 PT |
1485 | |
1486 | again: | |
1487 | rc = lnet_ptl_match_md(&info, msg); | |
1488 | switch (rc) { | |
1489 | default: | |
1490 | LBUG(); | |
1491 | ||
1492 | case LNET_MATCHMD_OK: | |
1493 | lnet_recv_put(ni, msg); | |
1494 | return 0; | |
1495 | ||
1496 | case LNET_MATCHMD_NONE: | |
1497 | if (msg->msg_rx_delayed) /* attached on delayed list */ | |
1498 | return 0; | |
1499 | ||
1500 | rc = lnet_ni_eager_recv(ni, msg); | |
5fd88337 | 1501 | if (!rc) |
d7e09d03 PT |
1502 | goto again; |
1503 | /* fall through */ | |
1504 | ||
1505 | case LNET_MATCHMD_DROP: | |
b0f5aad5 | 1506 | CNETERR("Dropping PUT from %s portal %d match %llu offset %d length %d: %d\n", |
d7e09d03 PT |
1507 | libcfs_id2str(info.mi_id), info.mi_portal, |
1508 | info.mi_mbits, info.mi_roffset, info.mi_rlength, rc); | |
1509 | ||
1510 | return ENOENT; /* +ve: OK but no match */ | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | static int | |
1515 | lnet_parse_get(lnet_ni_t *ni, lnet_msg_t *msg, int rdma_get) | |
1516 | { | |
7e7ab095 MS |
1517 | struct lnet_match_info info; |
1518 | lnet_hdr_t *hdr = &msg->msg_hdr; | |
1519 | lnet_handle_wire_t reply_wmd; | |
1520 | int rc; | |
d7e09d03 PT |
1521 | |
1522 | /* Convert get fields to host byte order */ | |
7e7ab095 MS |
1523 | hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits); |
1524 | hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index); | |
1525 | hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length); | |
1526 | hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset); | |
1527 | ||
1528 | info.mi_id.nid = hdr->src_nid; | |
1529 | info.mi_id.pid = hdr->src_pid; | |
1530 | info.mi_opc = LNET_MD_OP_GET; | |
1531 | info.mi_portal = hdr->msg.get.ptl_index; | |
1532 | info.mi_rlength = hdr->msg.get.sink_length; | |
1533 | info.mi_roffset = hdr->msg.get.src_offset; | |
1534 | info.mi_mbits = hdr->msg.get.match_bits; | |
d7e09d03 PT |
1535 | |
1536 | rc = lnet_ptl_match_md(&info, msg); | |
1537 | if (rc == LNET_MATCHMD_DROP) { | |
b0f5aad5 | 1538 | CNETERR("Dropping GET from %s portal %d match %llu offset %d length %d\n", |
d7e09d03 PT |
1539 | libcfs_id2str(info.mi_id), info.mi_portal, |
1540 | info.mi_mbits, info.mi_roffset, info.mi_rlength); | |
1541 | return ENOENT; /* +ve: OK but no match */ | |
1542 | } | |
1543 | ||
1544 | LASSERT(rc == LNET_MATCHMD_OK); | |
1545 | ||
1546 | lnet_build_msg_event(msg, LNET_EVENT_GET); | |
1547 | ||
1548 | reply_wmd = hdr->msg.get.return_wmd; | |
1549 | ||
1550 | lnet_prep_send(msg, LNET_MSG_REPLY, info.mi_id, | |
1551 | msg->msg_offset, msg->msg_wanted); | |
1552 | ||
1553 | msg->msg_hdr.msg.reply.dst_wmd = reply_wmd; | |
1554 | ||
1555 | if (rdma_get) { | |
1556 | /* The LND completes the REPLY from her recv procedure */ | |
1557 | lnet_ni_recv(ni, msg->msg_private, msg, 0, | |
1558 | msg->msg_offset, msg->msg_len, msg->msg_len); | |
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0); | |
1563 | msg->msg_receiving = 0; | |
1564 | ||
1565 | rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY); | |
1566 | if (rc < 0) { | |
1567 | /* didn't get as far as lnet_ni_send() */ | |
1568 | CERROR("%s: Unable to send REPLY for GET from %s: %d\n", | |
1569 | libcfs_nid2str(ni->ni_nid), | |
1570 | libcfs_id2str(info.mi_id), rc); | |
1571 | ||
1572 | lnet_finalize(ni, msg, rc); | |
1573 | } | |
1574 | ||
1575 | return 0; | |
1576 | } | |
1577 | ||
1578 | static int | |
1579 | lnet_parse_reply(lnet_ni_t *ni, lnet_msg_t *msg) | |
1580 | { | |
7e7ab095 MS |
1581 | void *private = msg->msg_private; |
1582 | lnet_hdr_t *hdr = &msg->msg_hdr; | |
d7e09d03 | 1583 | lnet_process_id_t src = {0}; |
7e7ab095 MS |
1584 | lnet_libmd_t *md; |
1585 | int rlength; | |
1586 | int mlength; | |
1587 | int cpt; | |
d7e09d03 PT |
1588 | |
1589 | cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie); | |
1590 | lnet_res_lock(cpt); | |
1591 | ||
1592 | src.nid = hdr->src_nid; | |
1593 | src.pid = hdr->src_pid; | |
1594 | ||
1595 | /* NB handles only looked up by creator (no flips) */ | |
1596 | md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd); | |
5fd88337 | 1597 | if (!md || !md->md_threshold || md->md_me) { |
55f5a824 | 1598 | CNETERR("%s: Dropping REPLY from %s for %s MD %#llx.%#llx\n", |
d7e09d03 | 1599 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
06ace26e | 1600 | !md ? "invalid" : "inactive", |
d7e09d03 PT |
1601 | hdr->msg.reply.dst_wmd.wh_interface_cookie, |
1602 | hdr->msg.reply.dst_wmd.wh_object_cookie); | |
06ace26e | 1603 | if (md && md->md_me) |
d7e09d03 PT |
1604 | CERROR("REPLY MD also attached to portal %d\n", |
1605 | md->md_me->me_portal); | |
1606 | ||
1607 | lnet_res_unlock(cpt); | |
1608 | return ENOENT; /* +ve: OK but no match */ | |
1609 | } | |
1610 | ||
5fd88337 | 1611 | LASSERT(!md->md_offset); |
d7e09d03 PT |
1612 | |
1613 | rlength = hdr->payload_length; | |
005b23d6 | 1614 | mlength = min_t(uint, rlength, md->md_length); |
d7e09d03 PT |
1615 | |
1616 | if (mlength < rlength && | |
5fd88337 | 1617 | !(md->md_options & LNET_MD_TRUNCATE)) { |
55f5a824 | 1618 | CNETERR("%s: Dropping REPLY from %s length %d for MD %#llx would overflow (%d)\n", |
d7e09d03 PT |
1619 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
1620 | rlength, hdr->msg.reply.dst_wmd.wh_object_cookie, | |
1621 | mlength); | |
1622 | lnet_res_unlock(cpt); | |
1623 | return ENOENT; /* +ve: OK but no match */ | |
1624 | } | |
1625 | ||
55f5a824 | 1626 | CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md %#llx\n", |
d7e09d03 PT |
1627 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
1628 | mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie); | |
1629 | ||
1630 | lnet_msg_attach_md(msg, md, 0, mlength); | |
1631 | ||
5fd88337 | 1632 | if (mlength) |
d7e09d03 PT |
1633 | lnet_setpayloadbuffer(msg); |
1634 | ||
1635 | lnet_res_unlock(cpt); | |
1636 | ||
1637 | lnet_build_msg_event(msg, LNET_EVENT_REPLY); | |
1638 | ||
1639 | lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength); | |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | static int | |
1644 | lnet_parse_ack(lnet_ni_t *ni, lnet_msg_t *msg) | |
1645 | { | |
7e7ab095 | 1646 | lnet_hdr_t *hdr = &msg->msg_hdr; |
d7e09d03 | 1647 | lnet_process_id_t src = {0}; |
7e7ab095 MS |
1648 | lnet_libmd_t *md; |
1649 | int cpt; | |
d7e09d03 PT |
1650 | |
1651 | src.nid = hdr->src_nid; | |
1652 | src.pid = hdr->src_pid; | |
1653 | ||
1654 | /* Convert ack fields to host byte order */ | |
1655 | hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits); | |
1656 | hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength); | |
1657 | ||
1658 | cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie); | |
1659 | lnet_res_lock(cpt); | |
1660 | ||
1661 | /* NB handles only looked up by creator (no flips) */ | |
1662 | md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd); | |
5fd88337 | 1663 | if (!md || !md->md_threshold || md->md_me) { |
d7e09d03 PT |
1664 | /* Don't moan; this is expected */ |
1665 | CDEBUG(D_NET, | |
55f5a824 | 1666 | "%s: Dropping ACK from %s to %s MD %#llx.%#llx\n", |
d7e09d03 | 1667 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
06ace26e | 1668 | !md ? "invalid" : "inactive", |
d7e09d03 PT |
1669 | hdr->msg.ack.dst_wmd.wh_interface_cookie, |
1670 | hdr->msg.ack.dst_wmd.wh_object_cookie); | |
06ace26e | 1671 | if (md && md->md_me) |
d7e09d03 PT |
1672 | CERROR("Source MD also attached to portal %d\n", |
1673 | md->md_me->me_portal); | |
1674 | ||
1675 | lnet_res_unlock(cpt); | |
1676 | return ENOENT; /* +ve! */ | |
1677 | } | |
1678 | ||
55f5a824 | 1679 | CDEBUG(D_NET, "%s: ACK from %s into md %#llx\n", |
d7e09d03 PT |
1680 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(src), |
1681 | hdr->msg.ack.dst_wmd.wh_object_cookie); | |
1682 | ||
1683 | lnet_msg_attach_md(msg, md, 0, 0); | |
1684 | ||
1685 | lnet_res_unlock(cpt); | |
1686 | ||
1687 | lnet_build_msg_event(msg, LNET_EVENT_ACK); | |
1688 | ||
1689 | lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len); | |
1690 | return 0; | |
1691 | } | |
1692 | ||
ec5fb5be LZ |
1693 | /** |
1694 | * \retval LNET_CREDIT_OK If \a msg is forwarded | |
1695 | * \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer | |
1696 | * \retval -ve error code | |
1697 | */ | |
d7e09d03 PT |
1698 | static int |
1699 | lnet_parse_forward_locked(lnet_ni_t *ni, lnet_msg_t *msg) | |
1700 | { | |
7e7ab095 | 1701 | int rc = 0; |
d7e09d03 | 1702 | |
86ef6250 AS |
1703 | if (!the_lnet.ln_routing) |
1704 | return -ECANCELED; | |
1705 | ||
d7e09d03 PT |
1706 | if (msg->msg_rxpeer->lp_rtrcredits <= 0 || |
1707 | lnet_msg2bufpool(msg)->rbp_credits <= 0) { | |
06ace26e | 1708 | if (!ni->ni_lnd->lnd_eager_recv) { |
d7e09d03 PT |
1709 | msg->msg_rx_ready_delay = 1; |
1710 | } else { | |
1711 | lnet_net_unlock(msg->msg_rx_cpt); | |
1712 | rc = lnet_ni_eager_recv(ni, msg); | |
1713 | lnet_net_lock(msg->msg_rx_cpt); | |
1714 | } | |
1715 | } | |
1716 | ||
5fd88337 | 1717 | if (!rc) |
d7e09d03 PT |
1718 | rc = lnet_post_routed_recv_locked(msg, 0); |
1719 | return rc; | |
1720 | } | |
1721 | ||
1722 | char * | |
af66a6e2 | 1723 | lnet_msgtyp2str(int type) |
d7e09d03 PT |
1724 | { |
1725 | switch (type) { | |
1726 | case LNET_MSG_ACK: | |
2b5f2e44 | 1727 | return "ACK"; |
d7e09d03 | 1728 | case LNET_MSG_PUT: |
2b5f2e44 | 1729 | return "PUT"; |
d7e09d03 | 1730 | case LNET_MSG_GET: |
2b5f2e44 | 1731 | return "GET"; |
d7e09d03 | 1732 | case LNET_MSG_REPLY: |
2b5f2e44 | 1733 | return "REPLY"; |
d7e09d03 | 1734 | case LNET_MSG_HELLO: |
2b5f2e44 | 1735 | return "HELLO"; |
d7e09d03 | 1736 | default: |
2b5f2e44 | 1737 | return "<UNKNOWN>"; |
d7e09d03 PT |
1738 | } |
1739 | } | |
d7e09d03 PT |
1740 | |
1741 | void | |
51f01fab | 1742 | lnet_print_hdr(lnet_hdr_t *hdr) |
d7e09d03 PT |
1743 | { |
1744 | lnet_process_id_t src = {0}; | |
1745 | lnet_process_id_t dst = {0}; | |
af66a6e2 | 1746 | char *type_str = lnet_msgtyp2str(hdr->type); |
d7e09d03 PT |
1747 | |
1748 | src.nid = hdr->src_nid; | |
1749 | src.pid = hdr->src_pid; | |
1750 | ||
1751 | dst.nid = hdr->dest_nid; | |
1752 | dst.pid = hdr->dest_pid; | |
1753 | ||
1754 | CWARN("P3 Header at %p of type %s\n", hdr, type_str); | |
1755 | CWARN(" From %s\n", libcfs_id2str(src)); | |
1756 | CWARN(" To %s\n", libcfs_id2str(dst)); | |
1757 | ||
1758 | switch (hdr->type) { | |
1759 | default: | |
1760 | break; | |
1761 | ||
1762 | case LNET_MSG_PUT: | |
2d00bd17 | 1763 | CWARN(" Ptl index %d, ack md %#llx.%#llx, match bits %llu\n", |
d7e09d03 PT |
1764 | hdr->msg.put.ptl_index, |
1765 | hdr->msg.put.ack_wmd.wh_interface_cookie, | |
1766 | hdr->msg.put.ack_wmd.wh_object_cookie, | |
1767 | hdr->msg.put.match_bits); | |
55f5a824 | 1768 | CWARN(" Length %d, offset %d, hdr data %#llx\n", |
d7e09d03 PT |
1769 | hdr->payload_length, hdr->msg.put.offset, |
1770 | hdr->msg.put.hdr_data); | |
1771 | break; | |
1772 | ||
1773 | case LNET_MSG_GET: | |
2d00bd17 JP |
1774 | CWARN(" Ptl index %d, return md %#llx.%#llx, match bits %llu\n", |
1775 | hdr->msg.get.ptl_index, | |
d7e09d03 PT |
1776 | hdr->msg.get.return_wmd.wh_interface_cookie, |
1777 | hdr->msg.get.return_wmd.wh_object_cookie, | |
1778 | hdr->msg.get.match_bits); | |
1779 | CWARN(" Length %d, src offset %d\n", | |
1780 | hdr->msg.get.sink_length, | |
1781 | hdr->msg.get.src_offset); | |
1782 | break; | |
1783 | ||
1784 | case LNET_MSG_ACK: | |
2d00bd17 | 1785 | CWARN(" dst md %#llx.%#llx, manipulated length %d\n", |
d7e09d03 PT |
1786 | hdr->msg.ack.dst_wmd.wh_interface_cookie, |
1787 | hdr->msg.ack.dst_wmd.wh_object_cookie, | |
1788 | hdr->msg.ack.mlength); | |
1789 | break; | |
1790 | ||
1791 | case LNET_MSG_REPLY: | |
2d00bd17 | 1792 | CWARN(" dst md %#llx.%#llx, length %d\n", |
d7e09d03 PT |
1793 | hdr->msg.reply.dst_wmd.wh_interface_cookie, |
1794 | hdr->msg.reply.dst_wmd.wh_object_cookie, | |
1795 | hdr->payload_length); | |
1796 | } | |
d7e09d03 PT |
1797 | } |
1798 | ||
1799 | int | |
1800 | lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid, | |
1801 | void *private, int rdma_req) | |
1802 | { | |
7e7ab095 MS |
1803 | int rc = 0; |
1804 | int cpt; | |
1805 | int for_me; | |
1806 | struct lnet_msg *msg; | |
1807 | lnet_pid_t dest_pid; | |
1808 | lnet_nid_t dest_nid; | |
1809 | lnet_nid_t src_nid; | |
1810 | __u32 payload_length; | |
1811 | __u32 type; | |
d7e09d03 | 1812 | |
af66a6e2 | 1813 | LASSERT(!in_interrupt()); |
d7e09d03 PT |
1814 | |
1815 | type = le32_to_cpu(hdr->type); | |
1816 | src_nid = le64_to_cpu(hdr->src_nid); | |
1817 | dest_nid = le64_to_cpu(hdr->dest_nid); | |
1818 | dest_pid = le32_to_cpu(hdr->dest_pid); | |
1819 | payload_length = le32_to_cpu(hdr->payload_length); | |
1820 | ||
1821 | for_me = (ni->ni_nid == dest_nid); | |
1822 | cpt = lnet_cpt_of_nid(from_nid); | |
1823 | ||
1824 | switch (type) { | |
1825 | case LNET_MSG_ACK: | |
1826 | case LNET_MSG_GET: | |
1827 | if (payload_length > 0) { | |
1828 | CERROR("%s, src %s: bad %s payload %d (0 expected)\n", | |
1829 | libcfs_nid2str(from_nid), | |
1830 | libcfs_nid2str(src_nid), | |
1831 | lnet_msgtyp2str(type), payload_length); | |
1832 | return -EPROTO; | |
1833 | } | |
1834 | break; | |
1835 | ||
1836 | case LNET_MSG_PUT: | |
1837 | case LNET_MSG_REPLY: | |
ae4003f0 LN |
1838 | if (payload_length > |
1839 | (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) { | |
2d00bd17 | 1840 | CERROR("%s, src %s: bad %s payload %d (%d max expected)\n", |
d7e09d03 PT |
1841 | libcfs_nid2str(from_nid), |
1842 | libcfs_nid2str(src_nid), | |
1843 | lnet_msgtyp2str(type), | |
1844 | payload_length, | |
1845 | for_me ? LNET_MAX_PAYLOAD : LNET_MTU); | |
1846 | return -EPROTO; | |
1847 | } | |
1848 | break; | |
1849 | ||
1850 | default: | |
1851 | CERROR("%s, src %s: Bad message type 0x%x\n", | |
1852 | libcfs_nid2str(from_nid), | |
1853 | libcfs_nid2str(src_nid), type); | |
1854 | return -EPROTO; | |
1855 | } | |
1856 | ||
1857 | if (the_lnet.ln_routing && | |
ec0067d1 | 1858 | ni->ni_last_alive != ktime_get_real_seconds()) { |
d7e09d03 | 1859 | /* NB: so far here is the only place to set NI status to "up */ |
86ef6250 | 1860 | lnet_ni_lock(ni); |
ec0067d1 | 1861 | ni->ni_last_alive = ktime_get_real_seconds(); |
06ace26e | 1862 | if (ni->ni_status && |
d7e09d03 PT |
1863 | ni->ni_status->ns_status == LNET_NI_STATUS_DOWN) |
1864 | ni->ni_status->ns_status = LNET_NI_STATUS_UP; | |
1865 | lnet_ni_unlock(ni); | |
1866 | } | |
1867 | ||
4420cfd3 JS |
1868 | /* |
1869 | * Regard a bad destination NID as a protocol error. Senders should | |
d7e09d03 | 1870 | * know what they're doing; if they don't they're misconfigured, buggy |
4420cfd3 JS |
1871 | * or malicious so we chop them off at the knees :) |
1872 | */ | |
d7e09d03 PT |
1873 | if (!for_me) { |
1874 | if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) { | |
1875 | /* should have gone direct */ | |
2d00bd17 JP |
1876 | CERROR("%s, src %s: Bad dest nid %s (should have been sent direct)\n", |
1877 | libcfs_nid2str(from_nid), | |
1878 | libcfs_nid2str(src_nid), | |
1879 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1880 | return -EPROTO; |
1881 | } | |
1882 | ||
1883 | if (lnet_islocalnid(dest_nid)) { | |
4420cfd3 JS |
1884 | /* |
1885 | * dest is another local NI; sender should have used | |
1886 | * this node's NID on its own network | |
1887 | */ | |
2d00bd17 JP |
1888 | CERROR("%s, src %s: Bad dest nid %s (it's my nid but on a different network)\n", |
1889 | libcfs_nid2str(from_nid), | |
1890 | libcfs_nid2str(src_nid), | |
1891 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1892 | return -EPROTO; |
1893 | } | |
1894 | ||
1895 | if (rdma_req && type == LNET_MSG_GET) { | |
2d00bd17 JP |
1896 | CERROR("%s, src %s: Bad optimized GET for %s (final destination must be me)\n", |
1897 | libcfs_nid2str(from_nid), | |
1898 | libcfs_nid2str(src_nid), | |
1899 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1900 | return -EPROTO; |
1901 | } | |
1902 | ||
1903 | if (!the_lnet.ln_routing) { | |
2d00bd17 JP |
1904 | CERROR("%s, src %s: Dropping message for %s (routing not enabled)\n", |
1905 | libcfs_nid2str(from_nid), | |
1906 | libcfs_nid2str(src_nid), | |
1907 | libcfs_nid2str(dest_nid)); | |
d7e09d03 PT |
1908 | goto drop; |
1909 | } | |
1910 | } | |
1911 | ||
4420cfd3 JS |
1912 | /* |
1913 | * Message looks OK; we're not going to return an error, so we MUST | |
1914 | * call back lnd_recv() come what may... | |
1915 | */ | |
af66a6e2 | 1916 | if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */ |
9b79ca85 | 1917 | fail_peer(src_nid, 0)) { /* shall we now? */ |
d7e09d03 PT |
1918 | CERROR("%s, src %s: Dropping %s to simulate failure\n", |
1919 | libcfs_nid2str(from_nid), libcfs_nid2str(src_nid), | |
1920 | lnet_msgtyp2str(type)); | |
1921 | goto drop; | |
1922 | } | |
1923 | ||
1924 | msg = lnet_msg_alloc(); | |
06ace26e | 1925 | if (!msg) { |
d7e09d03 PT |
1926 | CERROR("%s, src %s: Dropping %s (out of memory)\n", |
1927 | libcfs_nid2str(from_nid), libcfs_nid2str(src_nid), | |
1928 | lnet_msgtyp2str(type)); | |
1929 | goto drop; | |
1930 | } | |
1931 | ||
ae4003f0 LN |
1932 | /* msg zeroed in lnet_msg_alloc; |
1933 | * i.e. flags all clear, pointers NULL etc | |
1934 | */ | |
d7e09d03 PT |
1935 | msg->msg_type = type; |
1936 | msg->msg_private = private; | |
1937 | msg->msg_receiving = 1; | |
d3d3d37a JS |
1938 | msg->msg_wanted = payload_length; |
1939 | msg->msg_len = payload_length; | |
d7e09d03 PT |
1940 | msg->msg_offset = 0; |
1941 | msg->msg_hdr = *hdr; | |
1942 | /* for building message event */ | |
1943 | msg->msg_from = from_nid; | |
1944 | if (!for_me) { | |
1945 | msg->msg_target.pid = dest_pid; | |
1946 | msg->msg_target.nid = dest_nid; | |
1947 | msg->msg_routing = 1; | |
1948 | ||
1949 | } else { | |
1950 | /* convert common msg->hdr fields to host byteorder */ | |
1951 | msg->msg_hdr.type = type; | |
1952 | msg->msg_hdr.src_nid = src_nid; | |
1953 | msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid); | |
1954 | msg->msg_hdr.dest_nid = dest_nid; | |
1955 | msg->msg_hdr.dest_pid = dest_pid; | |
1956 | msg->msg_hdr.payload_length = payload_length; | |
1957 | } | |
1958 | ||
1959 | lnet_net_lock(cpt); | |
1960 | rc = lnet_nid2peer_locked(&msg->msg_rxpeer, from_nid, cpt); | |
5fd88337 | 1961 | if (rc) { |
d7e09d03 | 1962 | lnet_net_unlock(cpt); |
2d00bd17 | 1963 | CERROR("%s, src %s: Dropping %s (error %d looking up sender)\n", |
d7e09d03 PT |
1964 | libcfs_nid2str(from_nid), libcfs_nid2str(src_nid), |
1965 | lnet_msgtyp2str(type), rc); | |
1966 | lnet_msg_free(msg); | |
1967 | goto drop; | |
1968 | } | |
1969 | ||
af3fa7c7 LZ |
1970 | if (lnet_isrouter(msg->msg_rxpeer)) { |
1971 | lnet_peer_set_alive(msg->msg_rxpeer); | |
1972 | if (avoid_asym_router_failure && | |
1973 | LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) { | |
1974 | /* received a remote message from router, update | |
1975 | * remote NI status on this router. | |
1976 | * NB: multi-hop routed message will be ignored. | |
1977 | */ | |
1978 | lnet_router_ni_update_locked(msg->msg_rxpeer, | |
1979 | LNET_NIDNET(src_nid)); | |
1980 | } | |
1981 | } | |
1982 | ||
d7e09d03 PT |
1983 | lnet_msg_commit(msg, cpt); |
1984 | ||
1985 | if (!for_me) { | |
1986 | rc = lnet_parse_forward_locked(ni, msg); | |
1987 | lnet_net_unlock(cpt); | |
1988 | ||
1989 | if (rc < 0) | |
1990 | goto free_drop; | |
ec5fb5be LZ |
1991 | |
1992 | if (rc == LNET_CREDIT_OK) { | |
d7e09d03 PT |
1993 | lnet_ni_recv(ni, msg->msg_private, msg, 0, |
1994 | 0, payload_length, payload_length); | |
1995 | } | |
1996 | return 0; | |
1997 | } | |
1998 | ||
1999 | lnet_net_unlock(cpt); | |
2000 | ||
2001 | switch (type) { | |
2002 | case LNET_MSG_ACK: | |
2003 | rc = lnet_parse_ack(ni, msg); | |
2004 | break; | |
2005 | case LNET_MSG_PUT: | |
2006 | rc = lnet_parse_put(ni, msg); | |
2007 | break; | |
2008 | case LNET_MSG_GET: | |
2009 | rc = lnet_parse_get(ni, msg, rdma_req); | |
2010 | break; | |
2011 | case LNET_MSG_REPLY: | |
2012 | rc = lnet_parse_reply(ni, msg); | |
2013 | break; | |
2014 | default: | |
2015 | LASSERT(0); | |
2016 | rc = -EPROTO; | |
2017 | goto free_drop; /* prevent an unused label if !kernel */ | |
2018 | } | |
2019 | ||
5fd88337 | 2020 | if (!rc) |
d7e09d03 PT |
2021 | return 0; |
2022 | ||
af66a6e2 | 2023 | LASSERT(rc == ENOENT); |
d7e09d03 PT |
2024 | |
2025 | free_drop: | |
06ace26e | 2026 | LASSERT(!msg->msg_md); |
d7e09d03 PT |
2027 | lnet_finalize(ni, msg, rc); |
2028 | ||
2029 | drop: | |
2030 | lnet_drop_message(ni, cpt, private, payload_length); | |
2031 | return 0; | |
2032 | } | |
2033 | EXPORT_SYMBOL(lnet_parse); | |
2034 | ||
2035 | void | |
2036 | lnet_drop_delayed_msg_list(struct list_head *head, char *reason) | |
2037 | { | |
2038 | while (!list_empty(head)) { | |
7e7ab095 MS |
2039 | lnet_process_id_t id = {0}; |
2040 | lnet_msg_t *msg; | |
d7e09d03 PT |
2041 | |
2042 | msg = list_entry(head->next, lnet_msg_t, msg_list); | |
2043 | list_del(&msg->msg_list); | |
2044 | ||
2045 | id.nid = msg->msg_hdr.src_nid; | |
2046 | id.pid = msg->msg_hdr.src_pid; | |
2047 | ||
06ace26e | 2048 | LASSERT(!msg->msg_md); |
d7e09d03 | 2049 | LASSERT(msg->msg_rx_delayed); |
06ace26e | 2050 | LASSERT(msg->msg_rxpeer); |
d7e09d03 PT |
2051 | LASSERT(msg->msg_hdr.type == LNET_MSG_PUT); |
2052 | ||
b0f5aad5 | 2053 | CWARN("Dropping delayed PUT from %s portal %d match %llu offset %d length %d: %s\n", |
d7e09d03 PT |
2054 | libcfs_id2str(id), |
2055 | msg->msg_hdr.msg.put.ptl_index, | |
2056 | msg->msg_hdr.msg.put.match_bits, | |
2057 | msg->msg_hdr.msg.put.offset, | |
2058 | msg->msg_hdr.payload_length, reason); | |
2059 | ||
4420cfd3 JS |
2060 | /* |
2061 | * NB I can't drop msg's ref on msg_rxpeer until after I've | |
d7e09d03 | 2062 | * called lnet_drop_message(), so I just hang onto msg as well |
4420cfd3 JS |
2063 | * until that's done |
2064 | */ | |
d7e09d03 PT |
2065 | lnet_drop_message(msg->msg_rxpeer->lp_ni, |
2066 | msg->msg_rxpeer->lp_cpt, | |
2067 | msg->msg_private, msg->msg_len); | |
2068 | /* | |
2069 | * NB: message will not generate event because w/o attached MD, | |
2070 | * but we still should give error code so lnet_msg_decommit() | |
2071 | * can skip counters operations and other checks. | |
2072 | */ | |
2073 | lnet_finalize(msg->msg_rxpeer->lp_ni, msg, -ENOENT); | |
2074 | } | |
2075 | } | |
2076 | ||
2077 | void | |
2078 | lnet_recv_delayed_msg_list(struct list_head *head) | |
2079 | { | |
2080 | while (!list_empty(head)) { | |
7e7ab095 MS |
2081 | lnet_msg_t *msg; |
2082 | lnet_process_id_t id; | |
d7e09d03 PT |
2083 | |
2084 | msg = list_entry(head->next, lnet_msg_t, msg_list); | |
2085 | list_del(&msg->msg_list); | |
2086 | ||
4420cfd3 JS |
2087 | /* |
2088 | * md won't disappear under me, since each msg | |
2089 | * holds a ref on it | |
2090 | */ | |
d7e09d03 PT |
2091 | id.nid = msg->msg_hdr.src_nid; |
2092 | id.pid = msg->msg_hdr.src_pid; | |
2093 | ||
2094 | LASSERT(msg->msg_rx_delayed); | |
06ace26e JS |
2095 | LASSERT(msg->msg_md); |
2096 | LASSERT(msg->msg_rxpeer); | |
d7e09d03 PT |
2097 | LASSERT(msg->msg_hdr.type == LNET_MSG_PUT); |
2098 | ||
2d00bd17 JP |
2099 | CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d match %llu offset %d length %d.\n", |
2100 | libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index, | |
2101 | msg->msg_hdr.msg.put.match_bits, | |
2102 | msg->msg_hdr.msg.put.offset, | |
2103 | msg->msg_hdr.payload_length); | |
d7e09d03 PT |
2104 | |
2105 | lnet_recv_put(msg->msg_rxpeer->lp_ni, msg); | |
2106 | } | |
2107 | } | |
2108 | ||
2109 | /** | |
2110 | * Initiate an asynchronous PUT operation. | |
2111 | * | |
2112 | * There are several events associated with a PUT: completion of the send on | |
2113 | * the initiator node (LNET_EVENT_SEND), and when the send completes | |
2114 | * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating | |
2115 | * that the operation was accepted by the target. The event LNET_EVENT_PUT is | |
2116 | * used at the target node to indicate the completion of incoming data | |
2117 | * delivery. | |
2118 | * | |
2119 | * The local events will be logged in the EQ associated with the MD pointed to | |
2120 | * by \a mdh handle. Using a MD without an associated EQ results in these | |
2121 | * events being discarded. In this case, the caller must have another | |
2122 | * mechanism (e.g., a higher level protocol) for determining when it is safe | |
2123 | * to modify the memory region associated with the MD. | |
2124 | * | |
2125 | * Note that LNet does not guarantee the order of LNET_EVENT_SEND and | |
2126 | * LNET_EVENT_ACK, though intuitively ACK should happen after SEND. | |
2127 | * | |
2128 | * \param self Indicates the NID of a local interface through which to send | |
2129 | * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself. | |
2130 | * \param mdh A handle for the MD that describes the memory to be sent. The MD | |
2131 | * must be "free floating" (See LNetMDBind()). | |
2132 | * \param ack Controls whether an acknowledgment is requested. | |
2133 | * Acknowledgments are only sent when they are requested by the initiating | |
2134 | * process and the target MD enables them. | |
2135 | * \param target A process identifier for the target process. | |
2136 | * \param portal The index in the \a target's portal table. | |
2137 | * \param match_bits The match bits to use for MD selection at the target | |
2138 | * process. | |
2139 | * \param offset The offset into the target MD (only used when the target | |
2140 | * MD has the LNET_MD_MANAGE_REMOTE option set). | |
2141 | * \param hdr_data 64 bits of user data that can be included in the message | |
2142 | * header. This data is written to an event queue entry at the target if an | |
2143 | * EQ is present on the matching MD. | |
2144 | * | |
2145 | * \retval 0 Success, and only in this case events will be generated | |
2146 | * and logged to EQ (if it exists). | |
2147 | * \retval -EIO Simulated failure. | |
2148 | * \retval -ENOMEM Memory allocation failure. | |
2149 | * \retval -ENOENT Invalid MD object. | |
2150 | * | |
2151 | * \see lnet_event_t::hdr_data and lnet_event_kind_t. | |
2152 | */ | |
2153 | int | |
2154 | LNetPut(lnet_nid_t self, lnet_handle_md_t mdh, lnet_ack_req_t ack, | |
2155 | lnet_process_id_t target, unsigned int portal, | |
2156 | __u64 match_bits, unsigned int offset, | |
2157 | __u64 hdr_data) | |
2158 | { | |
7e7ab095 MS |
2159 | struct lnet_msg *msg; |
2160 | struct lnet_libmd *md; | |
2161 | int cpt; | |
2162 | int rc; | |
d7e09d03 | 2163 | |
af66a6e2 | 2164 | LASSERT(the_lnet.ln_refcount > 0); |
d7e09d03 | 2165 | |
af66a6e2 | 2166 | if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */ |
9b79ca85 | 2167 | fail_peer(target.nid, 1)) { /* shall we now? */ |
d7e09d03 PT |
2168 | CERROR("Dropping PUT to %s: simulated failure\n", |
2169 | libcfs_id2str(target)); | |
2170 | return -EIO; | |
2171 | } | |
2172 | ||
2173 | msg = lnet_msg_alloc(); | |
06ace26e | 2174 | if (!msg) { |
d7e09d03 PT |
2175 | CERROR("Dropping PUT to %s: ENOMEM on lnet_msg_t\n", |
2176 | libcfs_id2str(target)); | |
2177 | return -ENOMEM; | |
2178 | } | |
2179 | msg->msg_vmflush = !!memory_pressure_get(); | |
2180 | ||
2181 | cpt = lnet_cpt_of_cookie(mdh.cookie); | |
2182 | lnet_res_lock(cpt); | |
2183 | ||
2184 | md = lnet_handle2md(&mdh); | |
5fd88337 | 2185 | if (!md || !md->md_threshold || md->md_me) { |
b0f5aad5 | 2186 | CERROR("Dropping PUT (%llu:%d:%s): MD (%d) invalid\n", |
d7e09d03 | 2187 | match_bits, portal, libcfs_id2str(target), |
06ace26e JS |
2188 | !md ? -1 : md->md_threshold); |
2189 | if (md && md->md_me) | |
d7e09d03 PT |
2190 | CERROR("Source MD also attached to portal %d\n", |
2191 | md->md_me->me_portal); | |
2192 | lnet_res_unlock(cpt); | |
2193 | ||
2194 | lnet_msg_free(msg); | |
2195 | return -ENOENT; | |
2196 | } | |
2197 | ||
2198 | CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target)); | |
2199 | ||
2200 | lnet_msg_attach_md(msg, md, 0, 0); | |
2201 | ||
2202 | lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length); | |
2203 | ||
2204 | msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits); | |
2205 | msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal); | |
2206 | msg->msg_hdr.msg.put.offset = cpu_to_le32(offset); | |
2207 | msg->msg_hdr.msg.put.hdr_data = hdr_data; | |
2208 | ||
2209 | /* NB handles only looked up by creator (no flips) */ | |
2210 | if (ack == LNET_ACK_REQ) { | |
2211 | msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie = | |
2212 | the_lnet.ln_interface_cookie; | |
2213 | msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie = | |
2214 | md->md_lh.lh_cookie; | |
2215 | } else { | |
2216 | msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie = | |
2217 | LNET_WIRE_HANDLE_COOKIE_NONE; | |
2218 | msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie = | |
2219 | LNET_WIRE_HANDLE_COOKIE_NONE; | |
2220 | } | |
2221 | ||
2222 | lnet_res_unlock(cpt); | |
2223 | ||
2224 | lnet_build_msg_event(msg, LNET_EVENT_SEND); | |
2225 | ||
2226 | rc = lnet_send(self, msg, LNET_NID_ANY); | |
5fd88337 | 2227 | if (rc) { |
af66a6e2 | 2228 | CNETERR("Error sending PUT to %s: %d\n", |
c314c319 | 2229 | libcfs_id2str(target), rc); |
af66a6e2 | 2230 | lnet_finalize(NULL, msg, rc); |
d7e09d03 PT |
2231 | } |
2232 | ||
2233 | /* completion will be signalled by an event */ | |
2234 | return 0; | |
2235 | } | |
2236 | EXPORT_SYMBOL(LNetPut); | |
2237 | ||
2238 | lnet_msg_t * | |
af66a6e2 | 2239 | lnet_create_reply_msg(lnet_ni_t *ni, lnet_msg_t *getmsg) |
d7e09d03 | 2240 | { |
4420cfd3 JS |
2241 | /* |
2242 | * The LND can DMA direct to the GET md (i.e. no REPLY msg). This | |
d7e09d03 PT |
2243 | * returns a msg for the LND to pass to lnet_finalize() when the sink |
2244 | * data has been received. | |
2245 | * | |
2246 | * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when | |
4420cfd3 JS |
2247 | * lnet_finalize() is called on it, so the LND must call this first |
2248 | */ | |
7e7ab095 MS |
2249 | struct lnet_msg *msg = lnet_msg_alloc(); |
2250 | struct lnet_libmd *getmd = getmsg->msg_md; | |
2251 | lnet_process_id_t peer_id = getmsg->msg_target; | |
2252 | int cpt; | |
d7e09d03 PT |
2253 | |
2254 | LASSERT(!getmsg->msg_target_is_router); | |
2255 | LASSERT(!getmsg->msg_routing); | |
2256 | ||
06ace26e | 2257 | if (!msg) { |
af66a6e2 | 2258 | CERROR("%s: Dropping REPLY from %s: can't allocate msg\n", |
c314c319 | 2259 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id)); |
d7e09d03 PT |
2260 | goto drop; |
2261 | } | |
2262 | ||
600e9b49 LZ |
2263 | cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie); |
2264 | lnet_res_lock(cpt); | |
2265 | ||
2266 | LASSERT(getmd->md_refcount > 0); | |
2267 | ||
5fd88337 | 2268 | if (!getmd->md_threshold) { |
af66a6e2 | 2269 | CERROR("%s: Dropping REPLY from %s for inactive MD %p\n", |
c314c319 JS |
2270 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), |
2271 | getmd); | |
d7e09d03 PT |
2272 | lnet_res_unlock(cpt); |
2273 | goto drop; | |
2274 | } | |
2275 | ||
5fd88337 | 2276 | LASSERT(!getmd->md_offset); |
d7e09d03 PT |
2277 | |
2278 | CDEBUG(D_NET, "%s: Reply from %s md %p\n", | |
2279 | libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd); | |
2280 | ||
2281 | /* setup information for lnet_build_msg_event */ | |
2282 | msg->msg_from = peer_id.nid; | |
2283 | msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */ | |
2284 | msg->msg_hdr.src_nid = peer_id.nid; | |
2285 | msg->msg_hdr.payload_length = getmd->md_length; | |
2286 | msg->msg_receiving = 1; /* required by lnet_msg_attach_md */ | |
2287 | ||
2288 | lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length); | |
2289 | lnet_res_unlock(cpt); | |
2290 | ||
2291 | cpt = lnet_cpt_of_nid(peer_id.nid); | |
2292 | ||
2293 | lnet_net_lock(cpt); | |
2294 | lnet_msg_commit(msg, cpt); | |
2295 | lnet_net_unlock(cpt); | |
2296 | ||
2297 | lnet_build_msg_event(msg, LNET_EVENT_REPLY); | |
2298 | ||
2299 | return msg; | |
2300 | ||
2301 | drop: | |
2302 | cpt = lnet_cpt_of_nid(peer_id.nid); | |
2303 | ||
2304 | lnet_net_lock(cpt); | |
2305 | the_lnet.ln_counters[cpt]->drop_count++; | |
2306 | the_lnet.ln_counters[cpt]->drop_length += getmd->md_length; | |
2307 | lnet_net_unlock(cpt); | |
2308 | ||
06ace26e | 2309 | if (msg) |
d7e09d03 PT |
2310 | lnet_msg_free(msg); |
2311 | ||
2312 | return NULL; | |
2313 | } | |
2314 | EXPORT_SYMBOL(lnet_create_reply_msg); | |
2315 | ||
2316 | void | |
2317 | lnet_set_reply_msg_len(lnet_ni_t *ni, lnet_msg_t *reply, unsigned int len) | |
2318 | { | |
4420cfd3 JS |
2319 | /* |
2320 | * Set the REPLY length, now the RDMA that elides the REPLY message has | |
2321 | * completed and I know it. | |
2322 | */ | |
06ace26e | 2323 | LASSERT(reply); |
af66a6e2 LN |
2324 | LASSERT(reply->msg_type == LNET_MSG_GET); |
2325 | LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY); | |
d7e09d03 | 2326 | |
4420cfd3 JS |
2327 | /* |
2328 | * NB I trusted my peer to RDMA. If she tells me she's written beyond | |
2329 | * the end of my buffer, I might as well be dead. | |
2330 | */ | |
af66a6e2 | 2331 | LASSERT(len <= reply->msg_ev.mlength); |
d7e09d03 PT |
2332 | |
2333 | reply->msg_ev.mlength = len; | |
2334 | } | |
2335 | EXPORT_SYMBOL(lnet_set_reply_msg_len); | |
2336 | ||
2337 | /** | |
2338 | * Initiate an asynchronous GET operation. | |
2339 | * | |
2340 | * On the initiator node, an LNET_EVENT_SEND is logged when the GET request | |
2341 | * is sent, and an LNET_EVENT_REPLY is logged when the data returned from | |
2342 | * the target node in the REPLY has been written to local MD. | |
2343 | * | |
2344 | * On the target node, an LNET_EVENT_GET is logged when the GET request | |
2345 | * arrives and is accepted into a MD. | |
2346 | * | |
2347 | * \param self,target,portal,match_bits,offset See the discussion in LNetPut(). | |
2348 | * \param mdh A handle for the MD that describes the memory into which the | |
ae4003f0 LN |
2349 | * requested data will be received. The MD must be "free floating" |
2350 | * (See LNetMDBind()). | |
d7e09d03 PT |
2351 | * |
2352 | * \retval 0 Success, and only in this case events will be generated | |
2353 | * and logged to EQ (if it exists) of the MD. | |
2354 | * \retval -EIO Simulated failure. | |
2355 | * \retval -ENOMEM Memory allocation failure. | |
2356 | * \retval -ENOENT Invalid MD object. | |
2357 | */ | |
2358 | int | |
2359 | LNetGet(lnet_nid_t self, lnet_handle_md_t mdh, | |
2360 | lnet_process_id_t target, unsigned int portal, | |
2361 | __u64 match_bits, unsigned int offset) | |
2362 | { | |
7e7ab095 MS |
2363 | struct lnet_msg *msg; |
2364 | struct lnet_libmd *md; | |
2365 | int cpt; | |
2366 | int rc; | |
d7e09d03 | 2367 | |
af66a6e2 | 2368 | LASSERT(the_lnet.ln_refcount > 0); |
d7e09d03 | 2369 | |
af66a6e2 | 2370 | if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */ |
9b79ca85 | 2371 | fail_peer(target.nid, 1)) { /* shall we now? */ |
d7e09d03 PT |
2372 | CERROR("Dropping GET to %s: simulated failure\n", |
2373 | libcfs_id2str(target)); | |
2374 | return -EIO; | |
2375 | } | |
2376 | ||
2377 | msg = lnet_msg_alloc(); | |
06ace26e | 2378 | if (!msg) { |
d7e09d03 PT |
2379 | CERROR("Dropping GET to %s: ENOMEM on lnet_msg_t\n", |
2380 | libcfs_id2str(target)); | |
2381 | return -ENOMEM; | |
2382 | } | |
2383 | ||
2384 | cpt = lnet_cpt_of_cookie(mdh.cookie); | |
2385 | lnet_res_lock(cpt); | |
2386 | ||
2387 | md = lnet_handle2md(&mdh); | |
5fd88337 | 2388 | if (!md || !md->md_threshold || md->md_me) { |
b0f5aad5 | 2389 | CERROR("Dropping GET (%llu:%d:%s): MD (%d) invalid\n", |
d7e09d03 | 2390 | match_bits, portal, libcfs_id2str(target), |
06ace26e JS |
2391 | !md ? -1 : md->md_threshold); |
2392 | if (md && md->md_me) | |
d7e09d03 PT |
2393 | CERROR("REPLY MD also attached to portal %d\n", |
2394 | md->md_me->me_portal); | |
2395 | ||
2396 | lnet_res_unlock(cpt); | |
2397 | ||
2398 | lnet_msg_free(msg); | |
d7e09d03 PT |
2399 | return -ENOENT; |
2400 | } | |
2401 | ||
2402 | CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target)); | |
2403 | ||
2404 | lnet_msg_attach_md(msg, md, 0, 0); | |
2405 | ||
2406 | lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0); | |
2407 | ||
2408 | msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits); | |
2409 | msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal); | |
2410 | msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset); | |
2411 | msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length); | |
2412 | ||
2413 | /* NB handles only looked up by creator (no flips) */ | |
2414 | msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie = | |
2415 | the_lnet.ln_interface_cookie; | |
2416 | msg->msg_hdr.msg.get.return_wmd.wh_object_cookie = | |
2417 | md->md_lh.lh_cookie; | |
2418 | ||
2419 | lnet_res_unlock(cpt); | |
2420 | ||
2421 | lnet_build_msg_event(msg, LNET_EVENT_SEND); | |
2422 | ||
2423 | rc = lnet_send(self, msg, LNET_NID_ANY); | |
2424 | if (rc < 0) { | |
af66a6e2 | 2425 | CNETERR("Error sending GET to %s: %d\n", |
c314c319 | 2426 | libcfs_id2str(target), rc); |
af66a6e2 | 2427 | lnet_finalize(NULL, msg, rc); |
d7e09d03 PT |
2428 | } |
2429 | ||
2430 | /* completion will be signalled by an event */ | |
2431 | return 0; | |
2432 | } | |
2433 | EXPORT_SYMBOL(LNetGet); | |
2434 | ||
2435 | /** | |
2436 | * Calculate distance to node at \a dstnid. | |
2437 | * | |
2438 | * \param dstnid Target NID. | |
2439 | * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid | |
2440 | * is saved here. | |
2441 | * \param orderp If not NULL, order of the route to reach \a dstnid is saved | |
2442 | * here. | |
2443 | * | |
2444 | * \retval 0 If \a dstnid belongs to a local interface, and reserved option | |
2445 | * local_nid_dist_zero is set, which is the default. | |
2446 | * \retval positives Distance to target NID, i.e. number of hops plus one. | |
2447 | * \retval -EHOSTUNREACH If \a dstnid is not reachable. | |
2448 | */ | |
2449 | int | |
2450 | LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp) | |
2451 | { | |
7e7ab095 MS |
2452 | struct list_head *e; |
2453 | struct lnet_ni *ni; | |
2454 | lnet_remotenet_t *rnet; | |
2455 | __u32 dstnet = LNET_NIDNET(dstnid); | |
2456 | int hops; | |
2457 | int cpt; | |
2458 | __u32 order = 2; | |
2459 | struct list_head *rn_list; | |
d7e09d03 | 2460 | |
4420cfd3 JS |
2461 | /* |
2462 | * if !local_nid_dist_zero, I don't return a distance of 0 ever | |
d7e09d03 PT |
2463 | * (when lustre sees a distance of 0, it substitutes 0@lo), so I |
2464 | * keep order 0 free for 0@lo and order 1 free for a local NID | |
4420cfd3 JS |
2465 | * match |
2466 | */ | |
af66a6e2 | 2467 | LASSERT(the_lnet.ln_refcount > 0); |
d7e09d03 PT |
2468 | |
2469 | cpt = lnet_net_lock_current(); | |
2470 | ||
af66a6e2 | 2471 | list_for_each(e, &the_lnet.ln_nis) { |
d7e09d03 PT |
2472 | ni = list_entry(e, lnet_ni_t, ni_list); |
2473 | ||
2474 | if (ni->ni_nid == dstnid) { | |
06ace26e | 2475 | if (srcnidp) |
d7e09d03 | 2476 | *srcnidp = dstnid; |
06ace26e | 2477 | if (orderp) { |
d7e09d03 PT |
2478 | if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND) |
2479 | *orderp = 0; | |
2480 | else | |
2481 | *orderp = 1; | |
2482 | } | |
2483 | lnet_net_unlock(cpt); | |
2484 | ||
2485 | return local_nid_dist_zero ? 0 : 1; | |
2486 | } | |
2487 | ||
2488 | if (LNET_NIDNET(ni->ni_nid) == dstnet) { | |
06ace26e | 2489 | if (srcnidp) |
d7e09d03 | 2490 | *srcnidp = ni->ni_nid; |
06ace26e | 2491 | if (orderp) |
d7e09d03 PT |
2492 | *orderp = order; |
2493 | lnet_net_unlock(cpt); | |
2494 | return 1; | |
2495 | } | |
2496 | ||
2497 | order++; | |
2498 | } | |
2499 | ||
2500 | rn_list = lnet_net2rnethash(dstnet); | |
2501 | list_for_each(e, rn_list) { | |
2502 | rnet = list_entry(e, lnet_remotenet_t, lrn_list); | |
2503 | ||
2504 | if (rnet->lrn_net == dstnet) { | |
2505 | lnet_route_t *route; | |
2506 | lnet_route_t *shortest = NULL; | |
2507 | ||
af66a6e2 | 2508 | LASSERT(!list_empty(&rnet->lrn_routes)); |
d7e09d03 PT |
2509 | |
2510 | list_for_each_entry(route, &rnet->lrn_routes, | |
c314c319 | 2511 | lr_list) { |
06ace26e | 2512 | if (!shortest || |
d7e09d03 PT |
2513 | route->lr_hops < shortest->lr_hops) |
2514 | shortest = route; | |
2515 | } | |
2516 | ||
06ace26e | 2517 | LASSERT(shortest); |
d7e09d03 | 2518 | hops = shortest->lr_hops; |
06ace26e | 2519 | if (srcnidp) |
d7e09d03 | 2520 | *srcnidp = shortest->lr_gateway->lp_ni->ni_nid; |
06ace26e | 2521 | if (orderp) |
d7e09d03 PT |
2522 | *orderp = order; |
2523 | lnet_net_unlock(cpt); | |
2524 | return hops + 1; | |
2525 | } | |
2526 | order++; | |
2527 | } | |
2528 | ||
2529 | lnet_net_unlock(cpt); | |
2530 | return -EHOSTUNREACH; | |
2531 | } | |
2532 | EXPORT_SYMBOL(LNetDist); |