1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37 #define DEBUG_SUBSYSTEM S_LNET
38 #include "../../include/linux/lnet/lib-lnet.h"
39 #include <linux/log2.h>
40
41 #define D_LNI D_CONSOLE
42
43 lnet_t the_lnet; /* THE state of the network */
44 EXPORT_SYMBOL(the_lnet);
45
46
47 static char *ip2nets = "";
48 module_param(ip2nets, charp, 0444);
49 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
50
51 static char *networks = "";
52 module_param(networks, charp, 0444);
53 MODULE_PARM_DESC(networks, "local networks");
54
55 static char *routes = "";
56 module_param(routes, charp, 0444);
57 MODULE_PARM_DESC(routes, "routes to non-local networks");
58
59 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
60 module_param(rnet_htable_size, int, 0444);
61 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
62
63 static char *
lnet_get_routes(void)64 lnet_get_routes(void)
65 {
66 return routes;
67 }
68
69 static char *
lnet_get_networks(void)70 lnet_get_networks(void)
71 {
72 char *nets;
73 int rc;
74
75 if (*networks != 0 && *ip2nets != 0) {
76 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or 'ip2nets' but not both at once\n");
77 return NULL;
78 }
79
80 if (*ip2nets != 0) {
81 rc = lnet_parse_ip2nets(&nets, ip2nets);
82 return (rc == 0) ? nets : NULL;
83 }
84
85 if (*networks != 0)
86 return networks;
87
88 return "tcp";
89 }
90
91 static void
lnet_init_locks(void)92 lnet_init_locks(void)
93 {
94 spin_lock_init(&the_lnet.ln_eq_wait_lock);
95 init_waitqueue_head(&the_lnet.ln_eq_waitq);
96 mutex_init(&the_lnet.ln_lnd_mutex);
97 mutex_init(&the_lnet.ln_api_mutex);
98 }
99
100 static void
lnet_fini_locks(void)101 lnet_fini_locks(void)
102 {
103 }
104
105
106 static int
lnet_create_remote_nets_table(void)107 lnet_create_remote_nets_table(void)
108 {
109 int i;
110 struct list_head *hash;
111
112 LASSERT(the_lnet.ln_remote_nets_hash == NULL);
113 LASSERT(the_lnet.ln_remote_nets_hbits > 0);
114 LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
115 if (hash == NULL) {
116 CERROR("Failed to create remote nets hash table\n");
117 return -ENOMEM;
118 }
119
120 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
121 INIT_LIST_HEAD(&hash[i]);
122 the_lnet.ln_remote_nets_hash = hash;
123 return 0;
124 }
125
126 static void
lnet_destroy_remote_nets_table(void)127 lnet_destroy_remote_nets_table(void)
128 {
129 int i;
130
131 if (the_lnet.ln_remote_nets_hash == NULL)
132 return;
133
134 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
135 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
136
137 LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
138 LNET_REMOTE_NETS_HASH_SIZE *
139 sizeof(the_lnet.ln_remote_nets_hash[0]));
140 the_lnet.ln_remote_nets_hash = NULL;
141 }
142
143 static void
lnet_destroy_locks(void)144 lnet_destroy_locks(void)
145 {
146 if (the_lnet.ln_res_lock != NULL) {
147 cfs_percpt_lock_free(the_lnet.ln_res_lock);
148 the_lnet.ln_res_lock = NULL;
149 }
150
151 if (the_lnet.ln_net_lock != NULL) {
152 cfs_percpt_lock_free(the_lnet.ln_net_lock);
153 the_lnet.ln_net_lock = NULL;
154 }
155
156 lnet_fini_locks();
157 }
158
159 static int
lnet_create_locks(void)160 lnet_create_locks(void)
161 {
162 lnet_init_locks();
163
164 the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
165 if (the_lnet.ln_res_lock == NULL)
166 goto failed;
167
168 the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
169 if (the_lnet.ln_net_lock == NULL)
170 goto failed;
171
172 return 0;
173
174 failed:
175 lnet_destroy_locks();
176 return -ENOMEM;
177 }
178
lnet_assert_wire_constants(void)179 static void lnet_assert_wire_constants(void)
180 {
181 /* Wire protocol assertions generated by 'wirecheck'
182 * running on Linux robert.bartonsoftware.com 2.6.8-1.521
183 * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
184 * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
185
186 /* Constants... */
187 CLASSERT(LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
188 CLASSERT(LNET_PROTO_TCP_VERSION_MAJOR == 1);
189 CLASSERT(LNET_PROTO_TCP_VERSION_MINOR == 0);
190 CLASSERT(LNET_MSG_ACK == 0);
191 CLASSERT(LNET_MSG_PUT == 1);
192 CLASSERT(LNET_MSG_GET == 2);
193 CLASSERT(LNET_MSG_REPLY == 3);
194 CLASSERT(LNET_MSG_HELLO == 4);
195
196 /* Checks for struct ptl_handle_wire_t */
197 CLASSERT((int)sizeof(lnet_handle_wire_t) == 16);
198 CLASSERT((int)offsetof(lnet_handle_wire_t, wh_interface_cookie) == 0);
199 CLASSERT((int)sizeof(((lnet_handle_wire_t *)0)->wh_interface_cookie) == 8);
200 CLASSERT((int)offsetof(lnet_handle_wire_t, wh_object_cookie) == 8);
201 CLASSERT((int)sizeof(((lnet_handle_wire_t *)0)->wh_object_cookie) == 8);
202
203 /* Checks for struct lnet_magicversion_t */
204 CLASSERT((int)sizeof(lnet_magicversion_t) == 8);
205 CLASSERT((int)offsetof(lnet_magicversion_t, magic) == 0);
206 CLASSERT((int)sizeof(((lnet_magicversion_t *)0)->magic) == 4);
207 CLASSERT((int)offsetof(lnet_magicversion_t, version_major) == 4);
208 CLASSERT((int)sizeof(((lnet_magicversion_t *)0)->version_major) == 2);
209 CLASSERT((int)offsetof(lnet_magicversion_t, version_minor) == 6);
210 CLASSERT((int)sizeof(((lnet_magicversion_t *)0)->version_minor) == 2);
211
212 /* Checks for struct lnet_hdr_t */
213 CLASSERT((int)sizeof(lnet_hdr_t) == 72);
214 CLASSERT((int)offsetof(lnet_hdr_t, dest_nid) == 0);
215 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->dest_nid) == 8);
216 CLASSERT((int)offsetof(lnet_hdr_t, src_nid) == 8);
217 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->src_nid) == 8);
218 CLASSERT((int)offsetof(lnet_hdr_t, dest_pid) == 16);
219 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->dest_pid) == 4);
220 CLASSERT((int)offsetof(lnet_hdr_t, src_pid) == 20);
221 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->src_pid) == 4);
222 CLASSERT((int)offsetof(lnet_hdr_t, type) == 24);
223 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->type) == 4);
224 CLASSERT((int)offsetof(lnet_hdr_t, payload_length) == 28);
225 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->payload_length) == 4);
226 CLASSERT((int)offsetof(lnet_hdr_t, msg) == 32);
227 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg) == 40);
228
229 /* Ack */
230 CLASSERT((int)offsetof(lnet_hdr_t, msg.ack.dst_wmd) == 32);
231 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.ack.dst_wmd) == 16);
232 CLASSERT((int)offsetof(lnet_hdr_t, msg.ack.match_bits) == 48);
233 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.ack.match_bits) == 8);
234 CLASSERT((int)offsetof(lnet_hdr_t, msg.ack.mlength) == 56);
235 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.ack.mlength) == 4);
236
237 /* Put */
238 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.ack_wmd) == 32);
239 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.ack_wmd) == 16);
240 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.match_bits) == 48);
241 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.match_bits) == 8);
242 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.hdr_data) == 56);
243 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.hdr_data) == 8);
244 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.ptl_index) == 64);
245 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.ptl_index) == 4);
246 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.offset) == 68);
247 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.offset) == 4);
248
249 /* Get */
250 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.return_wmd) == 32);
251 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.return_wmd) == 16);
252 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.match_bits) == 48);
253 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.match_bits) == 8);
254 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.ptl_index) == 56);
255 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.ptl_index) == 4);
256 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.src_offset) == 60);
257 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.src_offset) == 4);
258 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.sink_length) == 64);
259 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.sink_length) == 4);
260
261 /* Reply */
262 CLASSERT((int)offsetof(lnet_hdr_t, msg.reply.dst_wmd) == 32);
263 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.reply.dst_wmd) == 16);
264
265 /* Hello */
266 CLASSERT((int)offsetof(lnet_hdr_t, msg.hello.incarnation) == 32);
267 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.hello.incarnation) == 8);
268 CLASSERT((int)offsetof(lnet_hdr_t, msg.hello.type) == 40);
269 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.hello.type) == 4);
270 }
271
272 static lnd_t *
lnet_find_lnd_by_type(int type)273 lnet_find_lnd_by_type(int type)
274 {
275 lnd_t *lnd;
276 struct list_head *tmp;
277
278 /* holding lnd mutex */
279 list_for_each (tmp, &the_lnet.ln_lnds) {
280 lnd = list_entry(tmp, lnd_t, lnd_list);
281
282 if ((int)lnd->lnd_type == type)
283 return lnd;
284 }
285
286 return NULL;
287 }
288
289 void
lnet_register_lnd(lnd_t * lnd)290 lnet_register_lnd(lnd_t *lnd)
291 {
292 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
293
294 LASSERT(the_lnet.ln_init);
295 LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
296 LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
297
298 list_add_tail(&lnd->lnd_list, &the_lnet.ln_lnds);
299 lnd->lnd_refcount = 0;
300
301 CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
302
303 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
304 }
305 EXPORT_SYMBOL(lnet_register_lnd);
306
307 void
lnet_unregister_lnd(lnd_t * lnd)308 lnet_unregister_lnd(lnd_t *lnd)
309 {
310 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
311
312 LASSERT(the_lnet.ln_init);
313 LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
314 LASSERT(lnd->lnd_refcount == 0);
315
316 list_del(&lnd->lnd_list);
317 CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
318
319 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
320 }
321 EXPORT_SYMBOL(lnet_unregister_lnd);
322
323 void
lnet_counters_get(lnet_counters_t * counters)324 lnet_counters_get(lnet_counters_t *counters)
325 {
326 lnet_counters_t *ctr;
327 int i;
328
329 memset(counters, 0, sizeof(*counters));
330
331 lnet_net_lock(LNET_LOCK_EX);
332
333 cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
334 counters->msgs_max += ctr->msgs_max;
335 counters->msgs_alloc += ctr->msgs_alloc;
336 counters->errors += ctr->errors;
337 counters->send_count += ctr->send_count;
338 counters->recv_count += ctr->recv_count;
339 counters->route_count += ctr->route_count;
340 counters->drop_count += ctr->drop_count;
341 counters->send_length += ctr->send_length;
342 counters->recv_length += ctr->recv_length;
343 counters->route_length += ctr->route_length;
344 counters->drop_length += ctr->drop_length;
345
346 }
347 lnet_net_unlock(LNET_LOCK_EX);
348 }
349 EXPORT_SYMBOL(lnet_counters_get);
350
351 void
lnet_counters_reset(void)352 lnet_counters_reset(void)
353 {
354 lnet_counters_t *counters;
355 int i;
356
357 lnet_net_lock(LNET_LOCK_EX);
358
359 cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
360 memset(counters, 0, sizeof(lnet_counters_t));
361
362 lnet_net_unlock(LNET_LOCK_EX);
363 }
364 EXPORT_SYMBOL(lnet_counters_reset);
365
366 #ifdef LNET_USE_LIB_FREELIST
367
368 int
lnet_freelist_init(lnet_freelist_t * fl,int n,int size)369 lnet_freelist_init(lnet_freelist_t *fl, int n, int size)
370 {
371 char *space;
372
373 LASSERT(n > 0);
374
375 size += offsetof(lnet_freeobj_t, fo_contents);
376
377 LIBCFS_ALLOC(space, n * size);
378 if (space == NULL)
379 return -ENOMEM;
380
381 INIT_LIST_HEAD(&fl->fl_list);
382 fl->fl_objs = space;
383 fl->fl_nobjs = n;
384 fl->fl_objsize = size;
385
386 do {
387 memset(space, 0, size);
388 list_add((struct list_head *)space, &fl->fl_list);
389 space += size;
390 } while (--n != 0);
391
392 return 0;
393 }
394
395 void
lnet_freelist_fini(lnet_freelist_t * fl)396 lnet_freelist_fini(lnet_freelist_t *fl)
397 {
398 struct list_head *el;
399 int count;
400
401 if (fl->fl_nobjs == 0)
402 return;
403
404 count = 0;
405 for (el = fl->fl_list.next; el != &fl->fl_list; el = el->next)
406 count++;
407
408 LASSERT(count == fl->fl_nobjs);
409
410 LIBCFS_FREE(fl->fl_objs, fl->fl_nobjs * fl->fl_objsize);
411 memset(fl, 0, sizeof(*fl));
412 }
413
414 #endif /* LNET_USE_LIB_FREELIST */
415
416 static __u64
lnet_create_interface_cookie(void)417 lnet_create_interface_cookie(void)
418 {
419 /* NB the interface cookie in wire handles guards against delayed
420 * replies and ACKs appearing valid after reboot. Initialisation time,
421 * even if it's only implemented to millisecond resolution is probably
422 * easily good enough. */
423 struct timeval tv;
424 __u64 cookie;
425
426 do_gettimeofday(&tv);
427 cookie = tv.tv_sec;
428 cookie *= 1000000;
429 cookie += tv.tv_usec;
430 return cookie;
431 }
432
433 static char *
lnet_res_type2str(int type)434 lnet_res_type2str(int type)
435 {
436 switch (type) {
437 default:
438 LBUG();
439 case LNET_COOKIE_TYPE_MD:
440 return "MD";
441 case LNET_COOKIE_TYPE_ME:
442 return "ME";
443 case LNET_COOKIE_TYPE_EQ:
444 return "EQ";
445 }
446 }
447
448 static void
lnet_res_container_cleanup(struct lnet_res_container * rec)449 lnet_res_container_cleanup(struct lnet_res_container *rec)
450 {
451 int count = 0;
452
453 if (rec->rec_type == 0) /* not set yet, it's uninitialized */
454 return;
455
456 while (!list_empty(&rec->rec_active)) {
457 struct list_head *e = rec->rec_active.next;
458
459 list_del_init(e);
460 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
461 lnet_eq_free(list_entry(e, lnet_eq_t, eq_list));
462
463 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
464 lnet_md_free(list_entry(e, lnet_libmd_t, md_list));
465
466 } else { /* NB: Active MEs should be attached on portals */
467 LBUG();
468 }
469 count++;
470 }
471
472 if (count > 0) {
473 /* Found alive MD/ME/EQ, user really should unlink/free
474 * all of them before finalize LNet, but if someone didn't,
475 * we have to recycle garbage for him */
476 CERROR("%d active elements on exit of %s container\n",
477 count, lnet_res_type2str(rec->rec_type));
478 }
479
480 #ifdef LNET_USE_LIB_FREELIST
481 lnet_freelist_fini(&rec->rec_freelist);
482 #endif
483 if (rec->rec_lh_hash != NULL) {
484 LIBCFS_FREE(rec->rec_lh_hash,
485 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
486 rec->rec_lh_hash = NULL;
487 }
488
489 rec->rec_type = 0; /* mark it as finalized */
490 }
491
492 static int
lnet_res_container_setup(struct lnet_res_container * rec,int cpt,int type,int objnum,int objsz)493 lnet_res_container_setup(struct lnet_res_container *rec,
494 int cpt, int type, int objnum, int objsz)
495 {
496 int rc = 0;
497 int i;
498
499 LASSERT(rec->rec_type == 0);
500
501 rec->rec_type = type;
502 INIT_LIST_HEAD(&rec->rec_active);
503
504 #ifdef LNET_USE_LIB_FREELIST
505 memset(&rec->rec_freelist, 0, sizeof(rec->rec_freelist));
506 rc = lnet_freelist_init(&rec->rec_freelist, objnum, objsz);
507 if (rc != 0)
508 goto out;
509 #endif
510 rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
511
512 /* Arbitrary choice of hash table size */
513 LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
514 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
515 if (rec->rec_lh_hash == NULL) {
516 rc = -ENOMEM;
517 goto out;
518 }
519
520 for (i = 0; i < LNET_LH_HASH_SIZE; i++)
521 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
522
523 return 0;
524
525 out:
526 CERROR("Failed to setup %s resource container\n",
527 lnet_res_type2str(type));
528 lnet_res_container_cleanup(rec);
529 return rc;
530 }
531
532 static void
lnet_res_containers_destroy(struct lnet_res_container ** recs)533 lnet_res_containers_destroy(struct lnet_res_container **recs)
534 {
535 struct lnet_res_container *rec;
536 int i;
537
538 cfs_percpt_for_each(rec, i, recs)
539 lnet_res_container_cleanup(rec);
540
541 cfs_percpt_free(recs);
542 }
543
544 static struct lnet_res_container **
lnet_res_containers_create(int type,int objnum,int objsz)545 lnet_res_containers_create(int type, int objnum, int objsz)
546 {
547 struct lnet_res_container **recs;
548 struct lnet_res_container *rec;
549 int rc;
550 int i;
551
552 recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
553 if (recs == NULL) {
554 CERROR("Failed to allocate %s resource containers\n",
555 lnet_res_type2str(type));
556 return NULL;
557 }
558
559 cfs_percpt_for_each(rec, i, recs) {
560 rc = lnet_res_container_setup(rec, i, type, objnum, objsz);
561 if (rc != 0) {
562 lnet_res_containers_destroy(recs);
563 return NULL;
564 }
565 }
566
567 return recs;
568 }
569
570 lnet_libhandle_t *
lnet_res_lh_lookup(struct lnet_res_container * rec,__u64 cookie)571 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
572 {
573 /* ALWAYS called with lnet_res_lock held */
574 struct list_head *head;
575 lnet_libhandle_t *lh;
576 unsigned int hash;
577
578 if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
579 return NULL;
580
581 hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
582 head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
583
584 list_for_each_entry(lh, head, lh_hash_chain) {
585 if (lh->lh_cookie == cookie)
586 return lh;
587 }
588
589 return NULL;
590 }
591
592 void
lnet_res_lh_initialize(struct lnet_res_container * rec,lnet_libhandle_t * lh)593 lnet_res_lh_initialize(struct lnet_res_container *rec, lnet_libhandle_t *lh)
594 {
595 /* ALWAYS called with lnet_res_lock held */
596 unsigned int ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
597 unsigned int hash;
598
599 lh->lh_cookie = rec->rec_lh_cookie;
600 rec->rec_lh_cookie += 1 << ibits;
601
602 hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
603
604 list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
605 }
606
607
608 int lnet_unprepare(void);
609
610 static int
lnet_prepare(lnet_pid_t requested_pid)611 lnet_prepare(lnet_pid_t requested_pid)
612 {
613 /* Prepare to bring up the network */
614 struct lnet_res_container **recs;
615 int rc = 0;
616
617 LASSERT(the_lnet.ln_refcount == 0);
618
619 the_lnet.ln_routing = 0;
620
621 LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
622 the_lnet.ln_pid = requested_pid;
623
624 INIT_LIST_HEAD(&the_lnet.ln_test_peers);
625 INIT_LIST_HEAD(&the_lnet.ln_nis);
626 INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
627 INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
628 INIT_LIST_HEAD(&the_lnet.ln_routers);
629
630 rc = lnet_create_remote_nets_table();
631 if (rc != 0)
632 goto failed;
633
634 the_lnet.ln_interface_cookie = lnet_create_interface_cookie();
635
636 the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
637 sizeof(lnet_counters_t));
638 if (the_lnet.ln_counters == NULL) {
639 CERROR("Failed to allocate counters for LNet\n");
640 rc = -ENOMEM;
641 goto failed;
642 }
643
644 rc = lnet_peer_tables_create();
645 if (rc != 0)
646 goto failed;
647
648 rc = lnet_msg_containers_create();
649 if (rc != 0)
650 goto failed;
651
652 rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
653 LNET_COOKIE_TYPE_EQ, LNET_FL_MAX_EQS,
654 sizeof(lnet_eq_t));
655 if (rc != 0)
656 goto failed;
657
658 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME, LNET_FL_MAX_MES,
659 sizeof(lnet_me_t));
660 if (recs == NULL)
661 goto failed;
662
663 the_lnet.ln_me_containers = recs;
664
665 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD, LNET_FL_MAX_MDS,
666 sizeof(lnet_libmd_t));
667 if (recs == NULL)
668 goto failed;
669
670 the_lnet.ln_md_containers = recs;
671
672 rc = lnet_portals_create();
673 if (rc != 0) {
674 CERROR("Failed to create portals for LNet: %d\n", rc);
675 goto failed;
676 }
677
678 return 0;
679
680 failed:
681 lnet_unprepare();
682 return rc;
683 }
684
685 int
lnet_unprepare(void)686 lnet_unprepare(void)
687 {
688 /* NB no LNET_LOCK since this is the last reference. All LND instances
689 * have shut down already, so it is safe to unlink and free all
690 * descriptors, even those that appear committed to a network op (eg MD
691 * with non-zero pending count) */
692
693 lnet_fail_nid(LNET_NID_ANY, 0);
694
695 LASSERT(the_lnet.ln_refcount == 0);
696 LASSERT(list_empty(&the_lnet.ln_test_peers));
697 LASSERT(list_empty(&the_lnet.ln_nis));
698 LASSERT(list_empty(&the_lnet.ln_nis_cpt));
699 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
700
701 lnet_portals_destroy();
702
703 if (the_lnet.ln_md_containers != NULL) {
704 lnet_res_containers_destroy(the_lnet.ln_md_containers);
705 the_lnet.ln_md_containers = NULL;
706 }
707
708 if (the_lnet.ln_me_containers != NULL) {
709 lnet_res_containers_destroy(the_lnet.ln_me_containers);
710 the_lnet.ln_me_containers = NULL;
711 }
712
713 lnet_res_container_cleanup(&the_lnet.ln_eq_container);
714
715 lnet_msg_containers_destroy();
716 lnet_peer_tables_destroy();
717 lnet_rtrpools_free();
718
719 if (the_lnet.ln_counters != NULL) {
720 cfs_percpt_free(the_lnet.ln_counters);
721 the_lnet.ln_counters = NULL;
722 }
723 lnet_destroy_remote_nets_table();
724
725 return 0;
726 }
727
728 lnet_ni_t *
lnet_net2ni_locked(__u32 net,int cpt)729 lnet_net2ni_locked(__u32 net, int cpt)
730 {
731 struct list_head *tmp;
732 lnet_ni_t *ni;
733
734 LASSERT(cpt != LNET_LOCK_EX);
735
736 list_for_each(tmp, &the_lnet.ln_nis) {
737 ni = list_entry(tmp, lnet_ni_t, ni_list);
738
739 if (LNET_NIDNET(ni->ni_nid) == net) {
740 lnet_ni_addref_locked(ni, cpt);
741 return ni;
742 }
743 }
744
745 return NULL;
746 }
747
748 lnet_ni_t *
lnet_net2ni(__u32 net)749 lnet_net2ni(__u32 net)
750 {
751 lnet_ni_t *ni;
752
753 lnet_net_lock(0);
754 ni = lnet_net2ni_locked(net, 0);
755 lnet_net_unlock(0);
756
757 return ni;
758 }
759 EXPORT_SYMBOL(lnet_net2ni);
760
761 static unsigned int
lnet_nid_cpt_hash(lnet_nid_t nid,unsigned int number)762 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
763 {
764 __u64 key = nid;
765 unsigned int val;
766
767 LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
768
769 if (number == 1)
770 return 0;
771
772 val = hash_long(key, LNET_CPT_BITS);
773 /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
774 if (val < number)
775 return val;
776
777 return (unsigned int)(key + val + (val >> 1)) % number;
778 }
779
780 int
lnet_cpt_of_nid_locked(lnet_nid_t nid)781 lnet_cpt_of_nid_locked(lnet_nid_t nid)
782 {
783 struct lnet_ni *ni;
784
785 /* must called with hold of lnet_net_lock */
786 if (LNET_CPT_NUMBER == 1)
787 return 0; /* the only one */
788
789 /* take lnet_net_lock(any) would be OK */
790 if (!list_empty(&the_lnet.ln_nis_cpt)) {
791 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
792 if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
793 continue;
794
795 LASSERT(ni->ni_cpts != NULL);
796 return ni->ni_cpts[lnet_nid_cpt_hash
797 (nid, ni->ni_ncpts)];
798 }
799 }
800
801 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
802 }
803
804 int
lnet_cpt_of_nid(lnet_nid_t nid)805 lnet_cpt_of_nid(lnet_nid_t nid)
806 {
807 int cpt;
808 int cpt2;
809
810 if (LNET_CPT_NUMBER == 1)
811 return 0; /* the only one */
812
813 if (list_empty(&the_lnet.ln_nis_cpt))
814 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
815
816 cpt = lnet_net_lock_current();
817 cpt2 = lnet_cpt_of_nid_locked(nid);
818 lnet_net_unlock(cpt);
819
820 return cpt2;
821 }
822 EXPORT_SYMBOL(lnet_cpt_of_nid);
823
824 int
lnet_islocalnet(__u32 net)825 lnet_islocalnet(__u32 net)
826 {
827 struct lnet_ni *ni;
828 int cpt;
829
830 cpt = lnet_net_lock_current();
831
832 ni = lnet_net2ni_locked(net, cpt);
833 if (ni != NULL)
834 lnet_ni_decref_locked(ni, cpt);
835
836 lnet_net_unlock(cpt);
837
838 return ni != NULL;
839 }
840
841 lnet_ni_t *
lnet_nid2ni_locked(lnet_nid_t nid,int cpt)842 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
843 {
844 struct lnet_ni *ni;
845 struct list_head *tmp;
846
847 LASSERT(cpt != LNET_LOCK_EX);
848
849 list_for_each(tmp, &the_lnet.ln_nis) {
850 ni = list_entry(tmp, lnet_ni_t, ni_list);
851
852 if (ni->ni_nid == nid) {
853 lnet_ni_addref_locked(ni, cpt);
854 return ni;
855 }
856 }
857
858 return NULL;
859 }
860
861 int
lnet_islocalnid(lnet_nid_t nid)862 lnet_islocalnid(lnet_nid_t nid)
863 {
864 struct lnet_ni *ni;
865 int cpt;
866
867 cpt = lnet_net_lock_current();
868 ni = lnet_nid2ni_locked(nid, cpt);
869 if (ni != NULL)
870 lnet_ni_decref_locked(ni, cpt);
871 lnet_net_unlock(cpt);
872
873 return ni != NULL;
874 }
875
876 int
lnet_count_acceptor_nis(void)877 lnet_count_acceptor_nis(void)
878 {
879 /* Return the # of NIs that need the acceptor. */
880 int count = 0;
881 struct list_head *tmp;
882 struct lnet_ni *ni;
883 int cpt;
884
885 cpt = lnet_net_lock_current();
886 list_for_each(tmp, &the_lnet.ln_nis) {
887 ni = list_entry(tmp, lnet_ni_t, ni_list);
888
889 if (ni->ni_lnd->lnd_accept != NULL)
890 count++;
891 }
892
893 lnet_net_unlock(cpt);
894
895 return count;
896 }
897
898 static int
lnet_ni_tq_credits(lnet_ni_t * ni)899 lnet_ni_tq_credits(lnet_ni_t *ni)
900 {
901 int credits;
902
903 LASSERT(ni->ni_ncpts >= 1);
904
905 if (ni->ni_ncpts == 1)
906 return ni->ni_maxtxcredits;
907
908 credits = ni->ni_maxtxcredits / ni->ni_ncpts;
909 credits = max(credits, 8 * ni->ni_peertxcredits);
910 credits = min(credits, ni->ni_maxtxcredits);
911
912 return credits;
913 }
914
915 static void
lnet_shutdown_lndnis(void)916 lnet_shutdown_lndnis(void)
917 {
918 int i;
919 int islo;
920 lnet_ni_t *ni;
921
922 /* NB called holding the global mutex */
923
924 /* All quiet on the API front */
925 LASSERT(!the_lnet.ln_shutdown);
926 LASSERT(the_lnet.ln_refcount == 0);
927 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
928
929 lnet_net_lock(LNET_LOCK_EX);
930 the_lnet.ln_shutdown = 1; /* flag shutdown */
931
932 /* Unlink NIs from the global table */
933 while (!list_empty(&the_lnet.ln_nis)) {
934 ni = list_entry(the_lnet.ln_nis.next,
935 lnet_ni_t, ni_list);
936 /* move it to zombie list and nobody can find it anymore */
937 list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
938 lnet_ni_decref_locked(ni, 0); /* drop ln_nis' ref */
939
940 if (!list_empty(&ni->ni_cptlist)) {
941 list_del_init(&ni->ni_cptlist);
942 lnet_ni_decref_locked(ni, 0);
943 }
944 }
945
946 /* Drop the cached eqwait NI. */
947 if (the_lnet.ln_eq_waitni != NULL) {
948 lnet_ni_decref_locked(the_lnet.ln_eq_waitni, 0);
949 the_lnet.ln_eq_waitni = NULL;
950 }
951
952 /* Drop the cached loopback NI. */
953 if (the_lnet.ln_loni != NULL) {
954 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
955 the_lnet.ln_loni = NULL;
956 }
957
958 lnet_net_unlock(LNET_LOCK_EX);
959
960 /* Clear lazy portals and drop delayed messages which hold refs
961 * on their lnet_msg_t::msg_rxpeer */
962 for (i = 0; i < the_lnet.ln_nportals; i++)
963 LNetClearLazyPortal(i);
964
965 /* Clear the peer table and wait for all peers to go (they hold refs on
966 * their NIs) */
967 lnet_peer_tables_cleanup();
968
969 lnet_net_lock(LNET_LOCK_EX);
970 /* Now wait for the NI's I just nuked to show up on ln_zombie_nis
971 * and shut them down in guaranteed thread context */
972 i = 2;
973 while (!list_empty(&the_lnet.ln_nis_zombie)) {
974 int *ref;
975 int j;
976
977 ni = list_entry(the_lnet.ln_nis_zombie.next,
978 lnet_ni_t, ni_list);
979 list_del_init(&ni->ni_list);
980 cfs_percpt_for_each(ref, j, ni->ni_refs) {
981 if (*ref == 0)
982 continue;
983 /* still busy, add it back to zombie list */
984 list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
985 break;
986 }
987
988 if (!list_empty(&ni->ni_list)) {
989 lnet_net_unlock(LNET_LOCK_EX);
990 ++i;
991 if ((i & (-i)) == i) {
992 CDEBUG(D_WARNING, "Waiting for zombie LNI %s\n",
993 libcfs_nid2str(ni->ni_nid));
994 }
995 set_current_state(TASK_UNINTERRUPTIBLE);
996 schedule_timeout(cfs_time_seconds(1));
997 lnet_net_lock(LNET_LOCK_EX);
998 continue;
999 }
1000
1001 ni->ni_lnd->lnd_refcount--;
1002 lnet_net_unlock(LNET_LOCK_EX);
1003
1004 islo = ni->ni_lnd->lnd_type == LOLND;
1005
1006 LASSERT(!in_interrupt());
1007 (ni->ni_lnd->lnd_shutdown)(ni);
1008
1009 /* can't deref lnd anymore now; it might have unregistered
1010 * itself... */
1011
1012 if (!islo)
1013 CDEBUG(D_LNI, "Removed LNI %s\n",
1014 libcfs_nid2str(ni->ni_nid));
1015
1016 lnet_ni_free(ni);
1017 i = 2;
1018
1019 lnet_net_lock(LNET_LOCK_EX);
1020 }
1021
1022 the_lnet.ln_shutdown = 0;
1023 lnet_net_unlock(LNET_LOCK_EX);
1024
1025 if (the_lnet.ln_network_tokens != NULL) {
1026 LIBCFS_FREE(the_lnet.ln_network_tokens,
1027 the_lnet.ln_network_tokens_nob);
1028 the_lnet.ln_network_tokens = NULL;
1029 }
1030 }
1031
1032 static int
lnet_startup_lndnis(void)1033 lnet_startup_lndnis(void)
1034 {
1035 lnd_t *lnd;
1036 struct lnet_ni *ni;
1037 struct lnet_tx_queue *tq;
1038 struct list_head nilist;
1039 int i;
1040 int rc = 0;
1041 int lnd_type;
1042 int nicount = 0;
1043 char *nets = lnet_get_networks();
1044
1045 INIT_LIST_HEAD(&nilist);
1046
1047 if (nets == NULL)
1048 goto failed;
1049
1050 rc = lnet_parse_networks(&nilist, nets);
1051 if (rc != 0)
1052 goto failed;
1053
1054 while (!list_empty(&nilist)) {
1055 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
1056 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1057
1058 LASSERT(libcfs_isknown_lnd(lnd_type));
1059
1060 if (lnd_type == CIBLND ||
1061 lnd_type == OPENIBLND ||
1062 lnd_type == IIBLND ||
1063 lnd_type == VIBLND) {
1064 CERROR("LND %s obsoleted\n",
1065 libcfs_lnd2str(lnd_type));
1066 goto failed;
1067 }
1068
1069 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1070 lnd = lnet_find_lnd_by_type(lnd_type);
1071
1072 if (lnd == NULL) {
1073 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1074 rc = request_module("%s",
1075 libcfs_lnd2modname(lnd_type));
1076 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1077
1078 lnd = lnet_find_lnd_by_type(lnd_type);
1079 if (lnd == NULL) {
1080 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1081 CERROR("Can't load LND %s, module %s, rc=%d\n",
1082 libcfs_lnd2str(lnd_type),
1083 libcfs_lnd2modname(lnd_type), rc);
1084 goto failed;
1085 }
1086 }
1087
1088 lnet_net_lock(LNET_LOCK_EX);
1089 lnd->lnd_refcount++;
1090 lnet_net_unlock(LNET_LOCK_EX);
1091
1092 ni->ni_lnd = lnd;
1093
1094 rc = (lnd->lnd_startup)(ni);
1095
1096 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1097
1098 if (rc != 0) {
1099 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
1100 rc, libcfs_lnd2str(lnd->lnd_type));
1101 lnet_net_lock(LNET_LOCK_EX);
1102 lnd->lnd_refcount--;
1103 lnet_net_unlock(LNET_LOCK_EX);
1104 goto failed;
1105 }
1106
1107 LASSERT(ni->ni_peertimeout <= 0 || lnd->lnd_query != NULL);
1108
1109 list_del(&ni->ni_list);
1110
1111 lnet_net_lock(LNET_LOCK_EX);
1112 /* refcount for ln_nis */
1113 lnet_ni_addref_locked(ni, 0);
1114 list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1115 if (ni->ni_cpts != NULL) {
1116 list_add_tail(&ni->ni_cptlist,
1117 &the_lnet.ln_nis_cpt);
1118 lnet_ni_addref_locked(ni, 0);
1119 }
1120
1121 lnet_net_unlock(LNET_LOCK_EX);
1122
1123 if (lnd->lnd_type == LOLND) {
1124 lnet_ni_addref(ni);
1125 LASSERT(the_lnet.ln_loni == NULL);
1126 the_lnet.ln_loni = ni;
1127 continue;
1128 }
1129
1130 if (ni->ni_peertxcredits == 0 ||
1131 ni->ni_maxtxcredits == 0) {
1132 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1133 libcfs_lnd2str(lnd->lnd_type),
1134 ni->ni_peertxcredits == 0 ?
1135 "" : "per-peer ");
1136 goto failed;
1137 }
1138
1139 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1140 tq->tq_credits_min =
1141 tq->tq_credits_max =
1142 tq->tq_credits = lnet_ni_tq_credits(ni);
1143 }
1144
1145 CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1146 libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1147 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1148 ni->ni_peerrtrcredits, ni->ni_peertimeout);
1149
1150 nicount++;
1151 }
1152
1153 if (the_lnet.ln_eq_waitni != NULL && nicount > 1) {
1154 lnd_type = the_lnet.ln_eq_waitni->ni_lnd->lnd_type;
1155 LCONSOLE_ERROR_MSG(0x109, "LND %s can only run single-network\n",
1156 libcfs_lnd2str(lnd_type));
1157 goto failed;
1158 }
1159
1160 return 0;
1161
1162 failed:
1163 lnet_shutdown_lndnis();
1164
1165 while (!list_empty(&nilist)) {
1166 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
1167 list_del(&ni->ni_list);
1168 lnet_ni_free(ni);
1169 }
1170
1171 return -ENETDOWN;
1172 }
1173
1174 /**
1175 * Initialize LNet library.
1176 *
1177 * Only userspace program needs to call this function - it's automatically
1178 * called in the kernel at module loading time. Caller has to call LNetFini()
1179 * after a call to LNetInit(), if and only if the latter returned 0. It must
1180 * be called exactly once.
1181 *
1182 * \return 0 on success, and -ve on failures.
1183 */
1184 int
LNetInit(void)1185 LNetInit(void)
1186 {
1187 int rc;
1188
1189 lnet_assert_wire_constants();
1190 LASSERT(!the_lnet.ln_init);
1191
1192 memset(&the_lnet, 0, sizeof(the_lnet));
1193
1194 /* refer to global cfs_cpt_table for now */
1195 the_lnet.ln_cpt_table = cfs_cpt_table;
1196 the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_table);
1197
1198 LASSERT(the_lnet.ln_cpt_number > 0);
1199 if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1200 /* we are under risk of consuming all lh_cookie */
1201 CERROR("Can't have %d CPTs for LNet (max allowed is %d), please change setting of CPT-table and retry\n",
1202 the_lnet.ln_cpt_number, LNET_CPT_MAX);
1203 return -1;
1204 }
1205
1206 while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1207 the_lnet.ln_cpt_bits++;
1208
1209 rc = lnet_create_locks();
1210 if (rc != 0) {
1211 CERROR("Can't create LNet global locks: %d\n", rc);
1212 return -1;
1213 }
1214
1215 the_lnet.ln_refcount = 0;
1216 the_lnet.ln_init = 1;
1217 LNetInvalidateHandle(&the_lnet.ln_rc_eqh);
1218 INIT_LIST_HEAD(&the_lnet.ln_lnds);
1219 INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1220 INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1221
1222 /* The hash table size is the number of bits it takes to express the set
1223 * ln_num_routes, minus 1 (better to under estimate than over so we
1224 * don't waste memory). */
1225 if (rnet_htable_size <= 0)
1226 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1227 else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1228 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1229 the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1230 order_base_2(rnet_htable_size) - 1);
1231
1232 /* All LNDs apart from the LOLND are in separate modules. They
1233 * register themselves when their module loads, and unregister
1234 * themselves when their module is unloaded. */
1235 lnet_register_lnd(&the_lolnd);
1236 return 0;
1237 }
1238 EXPORT_SYMBOL(LNetInit);
1239
1240 /**
1241 * Finalize LNet library.
1242 *
1243 * Only userspace program needs to call this function. It can be called
1244 * at most once.
1245 *
1246 * \pre LNetInit() called with success.
1247 * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1248 */
1249 void
LNetFini(void)1250 LNetFini(void)
1251 {
1252 LASSERT(the_lnet.ln_init);
1253 LASSERT(the_lnet.ln_refcount == 0);
1254
1255 while (!list_empty(&the_lnet.ln_lnds))
1256 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1257 lnd_t, lnd_list));
1258 lnet_destroy_locks();
1259
1260 the_lnet.ln_init = 0;
1261 }
1262 EXPORT_SYMBOL(LNetFini);
1263
1264 /**
1265 * Set LNet PID and start LNet interfaces, routing, and forwarding.
1266 *
1267 * Userspace program should call this after a successful call to LNetInit().
1268 * Users must call this function at least once before any other functions.
1269 * For each successful call there must be a corresponding call to
1270 * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1271 * ignored.
1272 *
1273 * The PID used by LNet may be different from the one requested.
1274 * See LNetGetId().
1275 *
1276 * \param requested_pid PID requested by the caller.
1277 *
1278 * \return >= 0 on success, and < 0 error code on failures.
1279 */
1280 int
LNetNIInit(lnet_pid_t requested_pid)1281 LNetNIInit(lnet_pid_t requested_pid)
1282 {
1283 int im_a_router = 0;
1284 int rc;
1285
1286 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1287
1288 LASSERT(the_lnet.ln_init);
1289 CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1290
1291 if (the_lnet.ln_refcount > 0) {
1292 rc = the_lnet.ln_refcount++;
1293 goto out;
1294 }
1295
1296 lnet_get_tunables();
1297
1298 if (requested_pid == LNET_PID_ANY) {
1299 /* Don't instantiate LNET just for me */
1300 rc = -ENETDOWN;
1301 goto failed0;
1302 }
1303
1304 rc = lnet_prepare(requested_pid);
1305 if (rc != 0)
1306 goto failed0;
1307
1308 rc = lnet_startup_lndnis();
1309 if (rc != 0)
1310 goto failed1;
1311
1312 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1313 if (rc != 0)
1314 goto failed2;
1315
1316 rc = lnet_check_routes();
1317 if (rc != 0)
1318 goto failed2;
1319
1320 rc = lnet_rtrpools_alloc(im_a_router);
1321 if (rc != 0)
1322 goto failed2;
1323
1324 rc = lnet_acceptor_start();
1325 if (rc != 0)
1326 goto failed2;
1327
1328 the_lnet.ln_refcount = 1;
1329 /* Now I may use my own API functions... */
1330
1331 /* NB router checker needs the_lnet.ln_ping_info in
1332 * lnet_router_checker -> lnet_update_ni_status_locked */
1333 rc = lnet_ping_target_init();
1334 if (rc != 0)
1335 goto failed3;
1336
1337 rc = lnet_router_checker_start();
1338 if (rc != 0)
1339 goto failed4;
1340
1341 lnet_proc_init();
1342 goto out;
1343
1344 failed4:
1345 lnet_ping_target_fini();
1346 failed3:
1347 the_lnet.ln_refcount = 0;
1348 lnet_acceptor_stop();
1349 failed2:
1350 lnet_destroy_routes();
1351 lnet_shutdown_lndnis();
1352 failed1:
1353 lnet_unprepare();
1354 failed0:
1355 LASSERT(rc < 0);
1356 out:
1357 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1358 return rc;
1359 }
1360 EXPORT_SYMBOL(LNetNIInit);
1361
1362 /**
1363 * Stop LNet interfaces, routing, and forwarding.
1364 *
1365 * Users must call this function once for each successful call to LNetNIInit().
1366 * Once the LNetNIFini() operation has been started, the results of pending
1367 * API operations are undefined.
1368 *
1369 * \return always 0 for current implementation.
1370 */
1371 int
LNetNIFini(void)1372 LNetNIFini(void)
1373 {
1374 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1375
1376 LASSERT(the_lnet.ln_init);
1377 LASSERT(the_lnet.ln_refcount > 0);
1378
1379 if (the_lnet.ln_refcount != 1) {
1380 the_lnet.ln_refcount--;
1381 } else {
1382 LASSERT(!the_lnet.ln_niinit_self);
1383
1384 lnet_proc_fini();
1385 lnet_router_checker_stop();
1386 lnet_ping_target_fini();
1387
1388 /* Teardown fns that use my own API functions BEFORE here */
1389 the_lnet.ln_refcount = 0;
1390
1391 lnet_acceptor_stop();
1392 lnet_destroy_routes();
1393 lnet_shutdown_lndnis();
1394 lnet_unprepare();
1395 }
1396
1397 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1398 return 0;
1399 }
1400 EXPORT_SYMBOL(LNetNIFini);
1401
1402 /**
1403 * This is an ugly hack to export IOC_LIBCFS_DEBUG_PEER and
1404 * IOC_LIBCFS_PORTALS_COMPATIBILITY commands to users, by tweaking the LNet
1405 * internal ioctl handler.
1406 *
1407 * IOC_LIBCFS_PORTALS_COMPATIBILITY is now deprecated, don't use it.
1408 *
1409 * \param cmd IOC_LIBCFS_DEBUG_PEER to print debugging data about a peer.
1410 * The data will be printed to system console. Don't use it excessively.
1411 * \param arg A pointer to lnet_process_id_t, process ID of the peer.
1412 *
1413 * \return Always return 0 when called by users directly (i.e., not via ioctl).
1414 */
1415 int
LNetCtl(unsigned int cmd,void * arg)1416 LNetCtl(unsigned int cmd, void *arg)
1417 {
1418 struct libcfs_ioctl_data *data = arg;
1419 lnet_process_id_t id = {0};
1420 lnet_ni_t *ni;
1421 int rc;
1422
1423 LASSERT(the_lnet.ln_init);
1424 LASSERT(the_lnet.ln_refcount > 0);
1425
1426 switch (cmd) {
1427 case IOC_LIBCFS_GET_NI:
1428 rc = LNetGetId(data->ioc_count, &id);
1429 data->ioc_nid = id.nid;
1430 return rc;
1431
1432 case IOC_LIBCFS_FAIL_NID:
1433 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1434
1435 case IOC_LIBCFS_ADD_ROUTE:
1436 rc = lnet_add_route(data->ioc_net, data->ioc_count,
1437 data->ioc_nid, data->ioc_priority);
1438 return (rc != 0) ? rc : lnet_check_routes();
1439
1440 case IOC_LIBCFS_DEL_ROUTE:
1441 return lnet_del_route(data->ioc_net, data->ioc_nid);
1442
1443 case IOC_LIBCFS_GET_ROUTE:
1444 return lnet_get_route(data->ioc_count,
1445 &data->ioc_net, &data->ioc_count,
1446 &data->ioc_nid, &data->ioc_flags,
1447 &data->ioc_priority);
1448 case IOC_LIBCFS_NOTIFY_ROUTER:
1449 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
1450 cfs_time_current() -
1451 cfs_time_seconds(get_seconds() -
1452 (time_t)data->ioc_u64[0]));
1453
1454 case IOC_LIBCFS_PORTALS_COMPATIBILITY:
1455 /* This can be removed once lustre stops calling it */
1456 return 0;
1457
1458 case IOC_LIBCFS_LNET_DIST:
1459 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
1460 if (rc < 0 && rc != -EHOSTUNREACH)
1461 return rc;
1462
1463 data->ioc_u32[0] = rc;
1464 return 0;
1465
1466 case IOC_LIBCFS_TESTPROTOCOMPAT:
1467 lnet_net_lock(LNET_LOCK_EX);
1468 the_lnet.ln_testprotocompat = data->ioc_flags;
1469 lnet_net_unlock(LNET_LOCK_EX);
1470 return 0;
1471
1472 case IOC_LIBCFS_PING:
1473 id.nid = data->ioc_nid;
1474 id.pid = data->ioc_u32[0];
1475 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
1476 (lnet_process_id_t *)data->ioc_pbuf1,
1477 data->ioc_plen1/sizeof(lnet_process_id_t));
1478 if (rc < 0)
1479 return rc;
1480 data->ioc_count = rc;
1481 return 0;
1482
1483 case IOC_LIBCFS_DEBUG_PEER: {
1484 /* CAVEAT EMPTOR: this one designed for calling directly; not
1485 * via an ioctl */
1486 id = *((lnet_process_id_t *) arg);
1487
1488 lnet_debug_peer(id.nid);
1489
1490 ni = lnet_net2ni(LNET_NIDNET(id.nid));
1491 if (ni == NULL) {
1492 CDEBUG(D_WARNING, "No NI for %s\n", libcfs_id2str(id));
1493 } else {
1494 if (ni->ni_lnd->lnd_ctl == NULL) {
1495 CDEBUG(D_WARNING, "No ctl for %s\n",
1496 libcfs_id2str(id));
1497 } else {
1498 (void)ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1499 }
1500
1501 lnet_ni_decref(ni);
1502 }
1503 return 0;
1504 }
1505
1506 default:
1507 ni = lnet_net2ni(data->ioc_net);
1508 if (ni == NULL)
1509 return -EINVAL;
1510
1511 if (ni->ni_lnd->lnd_ctl == NULL)
1512 rc = -EINVAL;
1513 else
1514 rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1515
1516 lnet_ni_decref(ni);
1517 return rc;
1518 }
1519 /* not reached */
1520 }
1521 EXPORT_SYMBOL(LNetCtl);
1522
1523 /**
1524 * Retrieve the lnet_process_id_t ID of LNet interface at \a index. Note that
1525 * all interfaces share a same PID, as requested by LNetNIInit().
1526 *
1527 * \param index Index of the interface to look up.
1528 * \param id On successful return, this location will hold the
1529 * lnet_process_id_t ID of the interface.
1530 *
1531 * \retval 0 If an interface exists at \a index.
1532 * \retval -ENOENT If no interface has been found.
1533 */
1534 int
LNetGetId(unsigned int index,lnet_process_id_t * id)1535 LNetGetId(unsigned int index, lnet_process_id_t *id)
1536 {
1537 struct lnet_ni *ni;
1538 struct list_head *tmp;
1539 int cpt;
1540 int rc = -ENOENT;
1541
1542 LASSERT(the_lnet.ln_init);
1543
1544 /* LNetNI initilization failed? */
1545 if (the_lnet.ln_refcount == 0)
1546 return rc;
1547
1548 cpt = lnet_net_lock_current();
1549
1550 list_for_each(tmp, &the_lnet.ln_nis) {
1551 if (index-- != 0)
1552 continue;
1553
1554 ni = list_entry(tmp, lnet_ni_t, ni_list);
1555
1556 id->nid = ni->ni_nid;
1557 id->pid = the_lnet.ln_pid;
1558 rc = 0;
1559 break;
1560 }
1561
1562 lnet_net_unlock(cpt);
1563 return rc;
1564 }
1565 EXPORT_SYMBOL(LNetGetId);
1566
1567 /**
1568 * Print a string representation of handle \a h into buffer \a str of
1569 * \a len bytes.
1570 */
1571 void
LNetSnprintHandle(char * str,int len,lnet_handle_any_t h)1572 LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
1573 {
1574 snprintf(str, len, "%#llx", h.cookie);
1575 }
1576 EXPORT_SYMBOL(LNetSnprintHandle);
1577
1578 static int
lnet_create_ping_info(void)1579 lnet_create_ping_info(void)
1580 {
1581 int i;
1582 int n;
1583 int rc;
1584 unsigned int infosz;
1585 lnet_ni_t *ni;
1586 lnet_process_id_t id;
1587 lnet_ping_info_t *pinfo;
1588
1589 for (n = 0; ; n++) {
1590 rc = LNetGetId(n, &id);
1591 if (rc == -ENOENT)
1592 break;
1593
1594 LASSERT(rc == 0);
1595 }
1596
1597 infosz = offsetof(lnet_ping_info_t, pi_ni[n]);
1598 LIBCFS_ALLOC(pinfo, infosz);
1599 if (pinfo == NULL) {
1600 CERROR("Can't allocate ping info[%d]\n", n);
1601 return -ENOMEM;
1602 }
1603
1604 pinfo->pi_nnis = n;
1605 pinfo->pi_pid = the_lnet.ln_pid;
1606 pinfo->pi_magic = LNET_PROTO_PING_MAGIC;
1607 pinfo->pi_features = LNET_PING_FEAT_NI_STATUS;
1608
1609 for (i = 0; i < n; i++) {
1610 lnet_ni_status_t *ns = &pinfo->pi_ni[i];
1611
1612 rc = LNetGetId(i, &id);
1613 LASSERT(rc == 0);
1614
1615 ns->ns_nid = id.nid;
1616 ns->ns_status = LNET_NI_STATUS_UP;
1617
1618 lnet_net_lock(0);
1619
1620 ni = lnet_nid2ni_locked(id.nid, 0);
1621 LASSERT(ni != NULL);
1622
1623 lnet_ni_lock(ni);
1624 LASSERT(ni->ni_status == NULL);
1625 ni->ni_status = ns;
1626 lnet_ni_unlock(ni);
1627
1628 lnet_ni_decref_locked(ni, 0);
1629 lnet_net_unlock(0);
1630 }
1631
1632 the_lnet.ln_ping_info = pinfo;
1633 return 0;
1634 }
1635
1636 static void
lnet_destroy_ping_info(void)1637 lnet_destroy_ping_info(void)
1638 {
1639 struct lnet_ni *ni;
1640
1641 lnet_net_lock(0);
1642
1643 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
1644 lnet_ni_lock(ni);
1645 ni->ni_status = NULL;
1646 lnet_ni_unlock(ni);
1647 }
1648
1649 lnet_net_unlock(0);
1650
1651 LIBCFS_FREE(the_lnet.ln_ping_info,
1652 offsetof(lnet_ping_info_t,
1653 pi_ni[the_lnet.ln_ping_info->pi_nnis]));
1654 the_lnet.ln_ping_info = NULL;
1655 return;
1656 }
1657
1658 int
lnet_ping_target_init(void)1659 lnet_ping_target_init(void)
1660 {
1661 lnet_md_t md = { NULL };
1662 lnet_handle_me_t meh;
1663 lnet_process_id_t id;
1664 int rc;
1665 int rc2;
1666 int infosz;
1667
1668 rc = lnet_create_ping_info();
1669 if (rc != 0)
1670 return rc;
1671
1672 /* We can have a tiny EQ since we only need to see the unlink event on
1673 * teardown, which by definition is the last one! */
1674 rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &the_lnet.ln_ping_target_eq);
1675 if (rc != 0) {
1676 CERROR("Can't allocate ping EQ: %d\n", rc);
1677 goto failed_0;
1678 }
1679
1680 memset(&id, 0, sizeof(lnet_process_id_t));
1681 id.nid = LNET_NID_ANY;
1682 id.pid = LNET_PID_ANY;
1683
1684 rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1685 LNET_PROTO_PING_MATCHBITS, 0,
1686 LNET_UNLINK, LNET_INS_AFTER,
1687 &meh);
1688 if (rc != 0) {
1689 CERROR("Can't create ping ME: %d\n", rc);
1690 goto failed_1;
1691 }
1692
1693 /* initialize md content */
1694 infosz = offsetof(lnet_ping_info_t,
1695 pi_ni[the_lnet.ln_ping_info->pi_nnis]);
1696 md.start = the_lnet.ln_ping_info;
1697 md.length = infosz;
1698 md.threshold = LNET_MD_THRESH_INF;
1699 md.max_size = 0;
1700 md.options = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1701 LNET_MD_MANAGE_REMOTE;
1702 md.user_ptr = NULL;
1703 md.eq_handle = the_lnet.ln_ping_target_eq;
1704
1705 rc = LNetMDAttach(meh, md,
1706 LNET_RETAIN,
1707 &the_lnet.ln_ping_target_md);
1708 if (rc != 0) {
1709 CERROR("Can't attach ping MD: %d\n", rc);
1710 goto failed_2;
1711 }
1712
1713 return 0;
1714
1715 failed_2:
1716 rc2 = LNetMEUnlink(meh);
1717 LASSERT(rc2 == 0);
1718 failed_1:
1719 rc2 = LNetEQFree(the_lnet.ln_ping_target_eq);
1720 LASSERT(rc2 == 0);
1721 failed_0:
1722 lnet_destroy_ping_info();
1723 return rc;
1724 }
1725
1726 void
lnet_ping_target_fini(void)1727 lnet_ping_target_fini(void)
1728 {
1729 lnet_event_t event;
1730 int rc;
1731 int which;
1732 int timeout_ms = 1000;
1733 sigset_t blocked = cfs_block_allsigs();
1734
1735 LNetMDUnlink(the_lnet.ln_ping_target_md);
1736 /* NB md could be busy; this just starts the unlink */
1737
1738 for (;;) {
1739 rc = LNetEQPoll(&the_lnet.ln_ping_target_eq, 1,
1740 timeout_ms, &event, &which);
1741
1742 /* I expect overflow... */
1743 LASSERT(rc >= 0 || rc == -EOVERFLOW);
1744
1745 if (rc == 0) {
1746 /* timed out: provide a diagnostic */
1747 CWARN("Still waiting for ping MD to unlink\n");
1748 timeout_ms *= 2;
1749 continue;
1750 }
1751
1752 /* Got a valid event */
1753 if (event.unlinked)
1754 break;
1755 }
1756
1757 rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1758 LASSERT(rc == 0);
1759 lnet_destroy_ping_info();
1760 cfs_restore_sigs(blocked);
1761 }
1762
1763 int
lnet_ping(lnet_process_id_t id,int timeout_ms,lnet_process_id_t * ids,int n_ids)1764 lnet_ping(lnet_process_id_t id, int timeout_ms, lnet_process_id_t *ids, int n_ids)
1765 {
1766 lnet_handle_eq_t eqh;
1767 lnet_handle_md_t mdh;
1768 lnet_event_t event;
1769 lnet_md_t md = { NULL };
1770 int which;
1771 int unlinked = 0;
1772 int replied = 0;
1773 const int a_long_time = 60000; /* mS */
1774 int infosz = offsetof(lnet_ping_info_t, pi_ni[n_ids]);
1775 lnet_ping_info_t *info;
1776 lnet_process_id_t tmpid;
1777 int i;
1778 int nob;
1779 int rc;
1780 int rc2;
1781 sigset_t blocked;
1782
1783 if (n_ids <= 0 ||
1784 id.nid == LNET_NID_ANY ||
1785 timeout_ms > 500000 || /* arbitrary limit! */
1786 n_ids > 20) /* arbitrary limit! */
1787 return -EINVAL;
1788
1789 if (id.pid == LNET_PID_ANY)
1790 id.pid = LUSTRE_SRV_LNET_PID;
1791
1792 LIBCFS_ALLOC(info, infosz);
1793 if (info == NULL)
1794 return -ENOMEM;
1795
1796 /* NB 2 events max (including any unlink event) */
1797 rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
1798 if (rc != 0) {
1799 CERROR("Can't allocate EQ: %d\n", rc);
1800 goto out_0;
1801 }
1802
1803 /* initialize md content */
1804 md.start = info;
1805 md.length = infosz;
1806 md.threshold = 2; /*GET/REPLY*/
1807 md.max_size = 0;
1808 md.options = LNET_MD_TRUNCATE;
1809 md.user_ptr = NULL;
1810 md.eq_handle = eqh;
1811
1812 rc = LNetMDBind(md, LNET_UNLINK, &mdh);
1813 if (rc != 0) {
1814 CERROR("Can't bind MD: %d\n", rc);
1815 goto out_1;
1816 }
1817
1818 rc = LNetGet(LNET_NID_ANY, mdh, id,
1819 LNET_RESERVED_PORTAL,
1820 LNET_PROTO_PING_MATCHBITS, 0);
1821
1822 if (rc != 0) {
1823 /* Don't CERROR; this could be deliberate! */
1824
1825 rc2 = LNetMDUnlink(mdh);
1826 LASSERT(rc2 == 0);
1827
1828 /* NB must wait for the UNLINK event below... */
1829 unlinked = 1;
1830 timeout_ms = a_long_time;
1831 }
1832
1833 do {
1834 /* MUST block for unlink to complete */
1835 if (unlinked)
1836 blocked = cfs_block_allsigs();
1837
1838 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
1839
1840 if (unlinked)
1841 cfs_restore_sigs(blocked);
1842
1843 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
1844 (rc2 <= 0) ? -1 : event.type,
1845 (rc2 <= 0) ? -1 : event.status,
1846 (rc2 > 0 && event.unlinked) ? " unlinked" : "");
1847
1848 LASSERT(rc2 != -EOVERFLOW); /* can't miss anything */
1849
1850 if (rc2 <= 0 || event.status != 0) {
1851 /* timeout or error */
1852 if (!replied && rc == 0)
1853 rc = (rc2 < 0) ? rc2 :
1854 (rc2 == 0) ? -ETIMEDOUT :
1855 event.status;
1856
1857 if (!unlinked) {
1858 /* Ensure completion in finite time... */
1859 LNetMDUnlink(mdh);
1860 /* No assertion (racing with network) */
1861 unlinked = 1;
1862 timeout_ms = a_long_time;
1863 } else if (rc2 == 0) {
1864 /* timed out waiting for unlink */
1865 CWARN("ping %s: late network completion\n",
1866 libcfs_id2str(id));
1867 }
1868 } else if (event.type == LNET_EVENT_REPLY) {
1869 replied = 1;
1870 rc = event.mlength;
1871 }
1872
1873 } while (rc2 <= 0 || !event.unlinked);
1874
1875 if (!replied) {
1876 if (rc >= 0)
1877 CWARN("%s: Unexpected rc >= 0 but no reply!\n",
1878 libcfs_id2str(id));
1879 rc = -EIO;
1880 goto out_1;
1881 }
1882
1883 nob = rc;
1884 LASSERT(nob >= 0 && nob <= infosz);
1885
1886 rc = -EPROTO; /* if I can't parse... */
1887
1888 if (nob < 8) {
1889 /* can't check magic/version */
1890 CERROR("%s: ping info too short %d\n",
1891 libcfs_id2str(id), nob);
1892 goto out_1;
1893 }
1894
1895 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
1896 lnet_swap_pinginfo(info);
1897 } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
1898 CERROR("%s: Unexpected magic %08x\n",
1899 libcfs_id2str(id), info->pi_magic);
1900 goto out_1;
1901 }
1902
1903 if ((info->pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
1904 CERROR("%s: ping w/o NI status: 0x%x\n",
1905 libcfs_id2str(id), info->pi_features);
1906 goto out_1;
1907 }
1908
1909 if (nob < offsetof(lnet_ping_info_t, pi_ni[0])) {
1910 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
1911 nob, (int)offsetof(lnet_ping_info_t, pi_ni[0]));
1912 goto out_1;
1913 }
1914
1915 if (info->pi_nnis < n_ids)
1916 n_ids = info->pi_nnis;
1917
1918 if (nob < offsetof(lnet_ping_info_t, pi_ni[n_ids])) {
1919 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
1920 nob, (int)offsetof(lnet_ping_info_t, pi_ni[n_ids]));
1921 goto out_1;
1922 }
1923
1924 rc = -EFAULT; /* If I SEGV... */
1925
1926 memset(&tmpid, 0, sizeof(tmpid));
1927 for (i = 0; i < n_ids; i++) {
1928 tmpid.pid = info->pi_pid;
1929 tmpid.nid = info->pi_ni[i].ns_nid;
1930 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
1931 goto out_1;
1932 }
1933 rc = info->pi_nnis;
1934
1935 out_1:
1936 rc2 = LNetEQFree(eqh);
1937 if (rc2 != 0)
1938 CERROR("rc2 %d\n", rc2);
1939 LASSERT(rc2 == 0);
1940
1941 out_0:
1942 LIBCFS_FREE(info, infosz);
1943 return rc;
1944 }
1945