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