Whamcloud - gitweb
9e344d4e35ceeb59c4181959be7623037a7e516d
[fs/lustre-release.git] / lnet / lnet / api-ni.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, Whamcloud, Inc.
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 <lnet/lib-lnet.h>
39
40 #ifdef __KERNEL__
41 #define D_LNI D_CONSOLE
42 #else
43 #define D_LNI D_CONFIG
44 #endif
45
46 lnet_t      the_lnet;                           /* THE state of the network */
47
48 #ifdef __KERNEL__
49
50 static char *ip2nets = "";
51 CFS_MODULE_PARM(ip2nets, "s", charp, 0444,
52                 "LNET network <- IP table");
53
54 static char *networks = "";
55 CFS_MODULE_PARM(networks, "s", charp, 0444,
56                 "local networks");
57
58 static char *routes = "";
59 CFS_MODULE_PARM(routes, "s", charp, 0444,
60                 "routes to non-local networks");
61
62 char *
63 lnet_get_routes(void)
64 {
65         return routes;
66 }
67
68 char *
69 lnet_get_networks(void)
70 {
71         char   *nets;
72         int     rc;
73
74         if (*networks != 0 && *ip2nets != 0) {
75                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
76                                    "'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 void
92 lnet_init_locks(void)
93 {
94         cfs_spin_lock_init(&the_lnet.ln_eq_wait_lock);
95         cfs_waitq_init(&the_lnet.ln_eq_waitq);
96         cfs_mutex_init(&the_lnet.ln_lnd_mutex);
97         cfs_mutex_init(&the_lnet.ln_api_mutex);
98 }
99
100 void
101 lnet_fini_locks(void)
102 {
103 }
104
105 #else
106
107 char *
108 lnet_get_routes(void)
109 {
110         char *str = getenv("LNET_ROUTES");
111
112         return (str == NULL) ? "" : str;
113 }
114
115 char *
116 lnet_get_networks (void)
117 {
118         static char       default_networks[256];
119         char             *networks = getenv ("LNET_NETWORKS");
120         char             *ip2nets  = getenv ("LNET_IP2NETS");
121         char             *str;
122         char             *sep;
123         int               len;
124         int               nob;
125         int               rc;
126         cfs_list_t       *tmp;
127
128 #ifdef NOT_YET
129         if (networks != NULL && ip2nets != NULL) {
130                 LCONSOLE_ERROR_MSG(0x103, "Please set EITHER 'LNET_NETWORKS' or"
131                                    " 'LNET_IP2NETS' but not both at once\n");
132                 return NULL;
133         }
134
135         if (ip2nets != NULL) {
136                 rc = lnet_parse_ip2nets(&networks, ip2nets);
137                 return (rc == 0) ? networks : NULL;
138         }
139 #else
140         SET_BUT_UNUSED(ip2nets);
141         SET_BUT_UNUSED(rc);
142 #endif
143         if (networks != NULL)
144                 return networks;
145
146         /* In userland, the default 'networks=' is the list of known net types */
147
148         len = sizeof(default_networks);
149         str = default_networks;
150         *str = 0;
151         sep = "";
152
153         cfs_list_for_each (tmp, &the_lnet.ln_lnds) {
154                 lnd_t *lnd = cfs_list_entry(tmp, lnd_t, lnd_list);
155
156                 nob = snprintf(str, len, "%s%s", sep,
157                                libcfs_lnd2str(lnd->lnd_type));
158                 len -= nob;
159                 if (len < 0) {
160                         /* overflowed the string; leave it where it was */
161                         *str = 0;
162                         break;
163                 }
164
165                 str += nob;
166                 sep = ",";
167         }
168
169         return default_networks;
170 }
171
172 # ifndef HAVE_LIBPTHREAD
173
174 void lnet_init_locks(void)
175 {
176         the_lnet.ln_eq_wait_lock = 0;
177         the_lnet.ln_lnd_mutex = 0;
178         the_lnet.ln_api_mutex = 0;
179 }
180
181 void lnet_fini_locks(void)
182 {
183         LASSERT(the_lnet.ln_api_mutex == 0);
184         LASSERT(the_lnet.ln_lnd_mutex == 0);
185         LASSERT(the_lnet.ln_eq_wait_lock == 0);
186 }
187
188 # else
189
190 void lnet_init_locks(void)
191 {
192         pthread_cond_init(&the_lnet.ln_eq_cond, NULL);
193         pthread_mutex_init(&the_lnet.ln_eq_wait_lock, NULL);
194         pthread_mutex_init(&the_lnet.ln_lnd_mutex, NULL);
195         pthread_mutex_init(&the_lnet.ln_api_mutex, NULL);
196 }
197
198 void lnet_fini_locks(void)
199 {
200         pthread_mutex_destroy(&the_lnet.ln_api_mutex);
201         pthread_mutex_destroy(&the_lnet.ln_lnd_mutex);
202         pthread_mutex_destroy(&the_lnet.ln_eq_wait_lock);
203         pthread_cond_destroy(&the_lnet.ln_eq_cond);
204 }
205
206 # endif
207 #endif
208
209 static int
210 lnet_create_locks(void)
211 {
212         lnet_init_locks();
213
214         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
215         if (the_lnet.ln_res_lock == NULL)
216                 goto failed;
217
218         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
219         if (the_lnet.ln_net_lock == NULL)
220                 goto failed;
221
222         return 0;
223
224  failed:
225         lnet_fini_locks();
226         return -ENOMEM;
227 }
228
229 static void
230 lnet_destroy_locks(void)
231 {
232         if (the_lnet.ln_res_lock != NULL) {
233                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
234                 the_lnet.ln_res_lock = NULL;
235         }
236
237         if (the_lnet.ln_net_lock != NULL) {
238                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
239                 the_lnet.ln_net_lock = NULL;
240         }
241
242         lnet_fini_locks();
243 }
244
245 void lnet_assert_wire_constants (void)
246 {
247         /* Wire protocol assertions generated by 'wirecheck'
248          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
249          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
250          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
251
252         /* Constants... */
253         CLASSERT (LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
254         CLASSERT (LNET_PROTO_TCP_VERSION_MAJOR == 1);
255         CLASSERT (LNET_PROTO_TCP_VERSION_MINOR == 0);
256         CLASSERT (LNET_MSG_ACK == 0);
257         CLASSERT (LNET_MSG_PUT == 1);
258         CLASSERT (LNET_MSG_GET == 2);
259         CLASSERT (LNET_MSG_REPLY == 3);
260         CLASSERT (LNET_MSG_HELLO == 4);
261
262         /* Checks for struct ptl_handle_wire_t */
263         CLASSERT ((int)sizeof(lnet_handle_wire_t) == 16);
264         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_interface_cookie) == 0);
265         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_interface_cookie) == 8);
266         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_object_cookie) == 8);
267         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_object_cookie) == 8);
268
269         /* Checks for struct lnet_magicversion_t */
270         CLASSERT ((int)sizeof(lnet_magicversion_t) == 8);
271         CLASSERT ((int)offsetof(lnet_magicversion_t, magic) == 0);
272         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->magic) == 4);
273         CLASSERT ((int)offsetof(lnet_magicversion_t, version_major) == 4);
274         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_major) == 2);
275         CLASSERT ((int)offsetof(lnet_magicversion_t, version_minor) == 6);
276         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_minor) == 2);
277
278         /* Checks for struct lnet_hdr_t */
279         CLASSERT ((int)sizeof(lnet_hdr_t) == 72);
280         CLASSERT ((int)offsetof(lnet_hdr_t, dest_nid) == 0);
281         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_nid) == 8);
282         CLASSERT ((int)offsetof(lnet_hdr_t, src_nid) == 8);
283         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_nid) == 8);
284         CLASSERT ((int)offsetof(lnet_hdr_t, dest_pid) == 16);
285         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_pid) == 4);
286         CLASSERT ((int)offsetof(lnet_hdr_t, src_pid) == 20);
287         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_pid) == 4);
288         CLASSERT ((int)offsetof(lnet_hdr_t, type) == 24);
289         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->type) == 4);
290         CLASSERT ((int)offsetof(lnet_hdr_t, payload_length) == 28);
291         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->payload_length) == 4);
292         CLASSERT ((int)offsetof(lnet_hdr_t, msg) == 32);
293         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg) == 40);
294
295         /* Ack */
296         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.dst_wmd) == 32);
297         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.dst_wmd) == 16);
298         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.match_bits) == 48);
299         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.match_bits) == 8);
300         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.mlength) == 56);
301         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.mlength) == 4);
302
303         /* Put */
304         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ack_wmd) == 32);
305         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ack_wmd) == 16);
306         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.match_bits) == 48);
307         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.match_bits) == 8);
308         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.hdr_data) == 56);
309         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.hdr_data) == 8);
310         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ptl_index) == 64);
311         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ptl_index) == 4);
312         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.offset) == 68);
313         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.offset) == 4);
314
315         /* Get */
316         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.return_wmd) == 32);
317         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.return_wmd) == 16);
318         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.match_bits) == 48);
319         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.match_bits) == 8);
320         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.ptl_index) == 56);
321         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.ptl_index) == 4);
322         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.src_offset) == 60);
323         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.src_offset) == 4);
324         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.sink_length) == 64);
325         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.sink_length) == 4);
326
327         /* Reply */
328         CLASSERT ((int)offsetof(lnet_hdr_t, msg.reply.dst_wmd) == 32);
329         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.reply.dst_wmd) == 16);
330
331         /* Hello */
332         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.incarnation) == 32);
333         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.incarnation) == 8);
334         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.type) == 40);
335         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.type) == 4);
336 }
337
338 lnd_t *
339 lnet_find_lnd_by_type (int type)
340 {
341         lnd_t              *lnd;
342         cfs_list_t         *tmp;
343
344         /* holding lnd mutex */
345         cfs_list_for_each (tmp, &the_lnet.ln_lnds) {
346                 lnd = cfs_list_entry(tmp, lnd_t, lnd_list);
347
348                 if ((int)lnd->lnd_type == type)
349                         return lnd;
350         }
351
352         return NULL;
353 }
354
355 void
356 lnet_register_lnd (lnd_t *lnd)
357 {
358         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
359
360         LASSERT (the_lnet.ln_init);
361         LASSERT (libcfs_isknown_lnd(lnd->lnd_type));
362         LASSERT (lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
363
364         cfs_list_add_tail (&lnd->lnd_list, &the_lnet.ln_lnds);
365         lnd->lnd_refcount = 0;
366
367         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
368
369         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
370 }
371
372 void
373 lnet_unregister_lnd (lnd_t *lnd)
374 {
375         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
376
377         LASSERT (the_lnet.ln_init);
378         LASSERT (lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
379         LASSERT (lnd->lnd_refcount == 0);
380
381         cfs_list_del (&lnd->lnd_list);
382         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
383
384         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
385 }
386
387 void
388 lnet_counters_get(lnet_counters_t *counters)
389 {
390         lnet_counters_t *ctr;
391         int             i;
392
393         memset(counters, 0, sizeof(*counters));
394
395         lnet_net_lock(LNET_LOCK_EX);
396
397         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
398                 counters->msgs_max     += ctr->msgs_max;
399                 counters->msgs_alloc   += ctr->msgs_alloc;
400                 counters->errors       += ctr->errors;
401                 counters->send_count   += ctr->send_count;
402                 counters->recv_count   += ctr->recv_count;
403                 counters->route_count  += ctr->route_count;
404                 counters->drop_length  += ctr->drop_length;
405                 counters->send_length  += ctr->send_length;
406                 counters->recv_length  += ctr->recv_length;
407                 counters->route_length += ctr->route_length;
408                 counters->drop_length  += ctr->drop_length;
409
410         }
411         lnet_net_unlock(LNET_LOCK_EX);
412 }
413 EXPORT_SYMBOL(lnet_counters_get);
414
415 void
416 lnet_counters_reset(void)
417 {
418         lnet_counters_t *counters;
419         int             i;
420
421         lnet_net_lock(LNET_LOCK_EX);
422
423         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
424                 memset(counters, 0, sizeof(lnet_counters_t));
425
426         lnet_net_unlock(LNET_LOCK_EX);
427 }
428 EXPORT_SYMBOL(lnet_counters_reset);
429
430 #ifdef LNET_USE_LIB_FREELIST
431
432 int
433 lnet_freelist_init (lnet_freelist_t *fl, int n, int size)
434 {
435         char *space;
436
437         LASSERT (n > 0);
438
439         size += offsetof (lnet_freeobj_t, fo_contents);
440
441         LIBCFS_ALLOC(space, n * size);
442         if (space == NULL)
443                 return (-ENOMEM);
444
445         CFS_INIT_LIST_HEAD (&fl->fl_list);
446         fl->fl_objs = space;
447         fl->fl_nobjs = n;
448         fl->fl_objsize = size;
449
450         do
451         {
452                 memset (space, 0, size);
453                 cfs_list_add ((cfs_list_t *)space, &fl->fl_list);
454                 space += size;
455         } while (--n != 0);
456
457         return (0);
458 }
459
460 void
461 lnet_freelist_fini (lnet_freelist_t *fl)
462 {
463         cfs_list_t       *el;
464         int               count;
465
466         if (fl->fl_nobjs == 0)
467                 return;
468
469         count = 0;
470         for (el = fl->fl_list.next; el != &fl->fl_list; el = el->next)
471                 count++;
472
473         LASSERT (count == fl->fl_nobjs);
474
475         LIBCFS_FREE(fl->fl_objs, fl->fl_nobjs * fl->fl_objsize);
476         memset (fl, 0, sizeof (*fl));
477 }
478
479 #endif /* LNET_USE_LIB_FREELIST */
480
481 __u64
482 lnet_create_interface_cookie (void)
483 {
484         /* NB the interface cookie in wire handles guards against delayed
485          * replies and ACKs appearing valid after reboot. Initialisation time,
486          * even if it's only implemented to millisecond resolution is probably
487          * easily good enough. */
488         struct timeval tv;
489         __u64          cookie;
490 #ifndef __KERNEL__
491         int            rc = gettimeofday (&tv, NULL);
492         LASSERT (rc == 0);
493 #else
494         cfs_gettimeofday(&tv);
495 #endif
496         cookie = tv.tv_sec;
497         cookie *= 1000000;
498         cookie += tv.tv_usec;
499         return cookie;
500 }
501
502 static char *
503 lnet_res_type2str(int type)
504 {
505         switch (type) {
506         default:
507                 LBUG();
508         case LNET_COOKIE_TYPE_MD:
509                 return "MD";
510         case LNET_COOKIE_TYPE_ME:
511                 return "ME";
512         case LNET_COOKIE_TYPE_EQ:
513                 return "EQ";
514         }
515 }
516
517 void
518 lnet_res_container_cleanup(struct lnet_res_container *rec)
519 {
520         int     count = 0;
521
522         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
523                 return;
524
525         while (!cfs_list_empty(&rec->rec_active)) {
526                 cfs_list_t *e = rec->rec_active.next;
527
528                 cfs_list_del_init(e);
529                 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
530                         lnet_eq_free(cfs_list_entry(e, lnet_eq_t, eq_list));
531
532                 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
533                         lnet_md_free(cfs_list_entry(e, lnet_libmd_t, md_list));
534
535                 } else { /* NB: Active MEs should be attached on portals */
536                         LBUG();
537                 }
538                 count++;
539         }
540
541         if (count > 0) {
542                 /* Found alive MD/ME/EQ, user really should unlink/free
543                  * all of them before finalize LNet, but if someone didn't,
544                  * we have to recycle garbage for him */
545                 CERROR("%d active elements on exit of %s container\n",
546                        count, lnet_res_type2str(rec->rec_type));
547         }
548
549 #ifdef LNET_USE_LIB_FREELIST
550         lnet_freelist_fini(&rec->rec_freelist);
551 #endif
552         if (rec->rec_lh_hash != NULL) {
553                 LIBCFS_FREE(rec->rec_lh_hash,
554                             LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
555                 rec->rec_lh_hash = NULL;
556         }
557
558         rec->rec_type = 0; /* mark it as finalized */
559 }
560
561 int
562 lnet_res_container_setup(struct lnet_res_container *rec,
563                          int cpt, int type, int objnum, int objsz)
564 {
565         int     rc = 0;
566         int     i;
567
568         LASSERT(rec->rec_type == 0);
569
570         rec->rec_type = type;
571         CFS_INIT_LIST_HEAD(&rec->rec_active);
572
573 #ifdef LNET_USE_LIB_FREELIST
574         memset(&rec->rec_freelist, 0, sizeof(rec->rec_freelist));
575         rc = lnet_freelist_init(&rec->rec_freelist, objnum, objsz);
576         if (rc != 0)
577                 goto out;
578 #endif
579         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
580
581         /* Arbitrary choice of hash table size */
582         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
583                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
584         if (rec->rec_lh_hash == NULL) {
585                 rc = -ENOMEM;
586                 goto out;
587         }
588
589         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
590                 CFS_INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
591
592         return 0;
593
594 out:
595         CERROR("Failed to setup %s resource container\n",
596                lnet_res_type2str(type));
597         lnet_res_container_cleanup(rec);
598         return rc;
599 }
600
601 static void
602 lnet_res_containers_destroy(struct lnet_res_container **recs)
603 {
604         struct lnet_res_container       *rec;
605         int                             i;
606
607         cfs_percpt_for_each(rec, i, recs)
608                 lnet_res_container_cleanup(rec);
609
610         cfs_percpt_free(recs);
611 }
612
613 static struct lnet_res_container **
614 lnet_res_containers_create(int type, int objnum, int objsz)
615 {
616         struct lnet_res_container       **recs;
617         struct lnet_res_container       *rec;
618         int                             rc;
619         int                             i;
620
621         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
622         if (recs == NULL) {
623                 CERROR("Failed to allocate %s resource containers\n",
624                        lnet_res_type2str(type));
625                 return NULL;
626         }
627
628         cfs_percpt_for_each(rec, i, recs) {
629                 rc = lnet_res_container_setup(rec, i, type, objnum, objsz);
630                 if (rc != 0) {
631                         lnet_res_containers_destroy(recs);
632                         return NULL;
633                 }
634         }
635
636         return recs;
637 }
638
639 lnet_libhandle_t *
640 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
641 {
642         /* ALWAYS called with lnet_res_lock held */
643         cfs_list_t              *head;
644         lnet_libhandle_t        *lh;
645         unsigned int            hash;
646
647         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
648                 return NULL;
649
650         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
651         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
652
653         cfs_list_for_each_entry(lh, head, lh_hash_chain) {
654                 if (lh->lh_cookie == cookie)
655                         return lh;
656         }
657
658         return NULL;
659 }
660
661 void
662 lnet_res_lh_initialize(struct lnet_res_container *rec, lnet_libhandle_t *lh)
663 {
664         /* ALWAYS called with lnet_res_lock held */
665         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
666         unsigned int    hash;
667
668         lh->lh_cookie = rec->rec_lh_cookie;
669         rec->rec_lh_cookie += 1 << ibits;
670
671         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
672
673         cfs_list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
674 }
675
676 #ifndef __KERNEL__
677 /**
678  * Reserved API - do not use.
679  * Temporary workaround to allow uOSS and test programs force server
680  * mode in userspace. See comments near ln_server_mode_flag in
681  * lnet/lib-types.h */
682
683 void
684 lnet_server_mode() {
685         the_lnet.ln_server_mode_flag = 1;
686 }
687 #endif
688
689 int lnet_unprepare(void);
690
691 int
692 lnet_prepare(lnet_pid_t requested_pid)
693 {
694         /* Prepare to bring up the network */
695         struct lnet_res_container **recs;
696         int                       rc = 0;
697
698         LASSERT (the_lnet.ln_refcount == 0);
699
700         the_lnet.ln_routing = 0;
701
702 #ifdef __KERNEL__
703         LASSERT ((requested_pid & LNET_PID_USERFLAG) == 0);
704         the_lnet.ln_pid = requested_pid;
705 #else
706         if (the_lnet.ln_server_mode_flag) {/* server case (uOSS) */
707                 LASSERT ((requested_pid & LNET_PID_USERFLAG) == 0);
708
709                 if (cfs_curproc_uid())/* Only root can run user-space server */
710                         return -EPERM;
711                 the_lnet.ln_pid = requested_pid;
712
713         } else {/* client case (liblustre) */
714
715                 /* My PID must be unique on this node and flag I'm userspace */
716                 the_lnet.ln_pid = getpid() | LNET_PID_USERFLAG;
717         }
718 #endif
719
720         CFS_INIT_LIST_HEAD(&the_lnet.ln_test_peers);
721         CFS_INIT_LIST_HEAD(&the_lnet.ln_nis);
722         CFS_INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
723         CFS_INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
724         CFS_INIT_LIST_HEAD(&the_lnet.ln_remote_nets);
725         CFS_INIT_LIST_HEAD(&the_lnet.ln_routers);
726
727         the_lnet.ln_interface_cookie = lnet_create_interface_cookie();
728
729         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
730                                                 sizeof(lnet_counters_t));
731         if (the_lnet.ln_counters == NULL) {
732                 CERROR("Failed to allocate counters for LNet\n");
733                 rc = -ENOMEM;
734                 goto failed;
735         }
736
737         rc = lnet_peer_tables_create();
738         if (rc != 0)
739                 goto failed;
740
741         rc = lnet_msg_containers_create();
742         if (rc != 0)
743                 goto failed;
744
745         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
746                                       LNET_COOKIE_TYPE_EQ, LNET_FL_MAX_EQS,
747                                       sizeof(lnet_eq_t));
748         if (rc != 0)
749                 goto failed;
750
751         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME, LNET_FL_MAX_MES,
752                                           sizeof(lnet_me_t));
753         if (recs == NULL)
754                 goto failed;
755
756         the_lnet.ln_me_containers = recs;
757
758         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD, LNET_FL_MAX_MDS,
759                                           sizeof(lnet_libmd_t));
760         if (recs == NULL)
761                 goto failed;
762
763         the_lnet.ln_md_containers = recs;
764
765         rc = lnet_portals_create();
766         if (rc != 0) {
767                 CERROR("Failed to create portals for LNet: %d\n", rc);
768                 goto failed;
769         }
770
771         return 0;
772
773  failed:
774         lnet_unprepare();
775         return rc;
776 }
777
778 int
779 lnet_unprepare (void)
780 {
781         /* NB no LNET_LOCK since this is the last reference.  All LND instances
782          * have shut down already, so it is safe to unlink and free all
783          * descriptors, even those that appear committed to a network op (eg MD
784          * with non-zero pending count) */
785
786         lnet_fail_nid(LNET_NID_ANY, 0);
787
788         LASSERT(the_lnet.ln_refcount == 0);
789         LASSERT(cfs_list_empty(&the_lnet.ln_test_peers));
790         LASSERT(cfs_list_empty(&the_lnet.ln_nis));
791         LASSERT(cfs_list_empty(&the_lnet.ln_nis_cpt));
792         LASSERT(cfs_list_empty(&the_lnet.ln_nis_zombie));
793
794         lnet_portals_destroy();
795
796         if (the_lnet.ln_md_containers != NULL) {
797                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
798                 the_lnet.ln_md_containers = NULL;
799         }
800
801         if (the_lnet.ln_me_containers != NULL) {
802                 lnet_res_containers_destroy(the_lnet.ln_me_containers);
803                 the_lnet.ln_me_containers = NULL;
804         }
805
806         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
807
808         lnet_msg_containers_destroy();
809         lnet_peer_tables_destroy();
810         lnet_rtrpools_free();
811
812         if (the_lnet.ln_counters != NULL) {
813                 cfs_percpt_free(the_lnet.ln_counters);
814                 the_lnet.ln_counters = NULL;
815         }
816
817         return 0;
818 }
819
820 lnet_ni_t  *
821 lnet_net2ni_locked(__u32 net, int cpt)
822 {
823         cfs_list_t      *tmp;
824         lnet_ni_t       *ni;
825
826         LASSERT(cpt != LNET_LOCK_EX);
827
828         cfs_list_for_each(tmp, &the_lnet.ln_nis) {
829                 ni = cfs_list_entry(tmp, lnet_ni_t, ni_list);
830
831                 if (LNET_NIDNET(ni->ni_nid) == net) {
832                         lnet_ni_addref_locked(ni, cpt);
833                         return ni;
834                 }
835         }
836
837         return NULL;
838 }
839
840 lnet_ni_t *
841 lnet_net2ni(__u32 net)
842 {
843         lnet_ni_t *ni;
844
845         lnet_net_lock(0);
846         ni = lnet_net2ni_locked(net, 0);
847         lnet_net_unlock(0);
848
849         return ni;
850 }
851 EXPORT_SYMBOL(lnet_net2ni);
852
853 static unsigned int
854 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
855 {
856         __u64           key = nid;
857         unsigned int    val;
858
859         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
860
861         if (number == 1)
862                 return 0;
863
864         val = cfs_hash_long(key, LNET_CPT_BITS);
865         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
866         if (val < number)
867                 return val;
868
869         return (unsigned int)(key + val + (val >> 1)) % number;
870 }
871
872 int
873 lnet_cpt_of_nid_locked(lnet_nid_t nid)
874 {
875         struct lnet_ni *ni;
876
877         /* must called with hold of lnet_net_lock */
878         if (LNET_CPT_NUMBER == 1)
879                 return 0; /* the only one */
880
881         /* take lnet_net_lock(any) would be OK */
882         if (!cfs_list_empty(&the_lnet.ln_nis_cpt)) {
883                 cfs_list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
884                         if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
885                                 continue;
886
887                         LASSERT(ni->ni_cpts != NULL);
888                         return ni->ni_cpts[lnet_nid_cpt_hash
889                                            (nid, ni->ni_ncpts)];
890                 }
891         }
892
893         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
894 }
895
896 int
897 lnet_cpt_of_nid(lnet_nid_t nid)
898 {
899         int     cpt;
900         int     cpt2;
901
902         if (LNET_CPT_NUMBER == 1)
903                 return 0; /* the only one */
904
905         if (cfs_list_empty(&the_lnet.ln_nis_cpt))
906                 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
907
908         cpt = lnet_net_lock_current();
909         cpt2 = lnet_cpt_of_nid_locked(nid);
910         lnet_net_unlock(cpt);
911
912         return cpt2;
913 }
914 EXPORT_SYMBOL(lnet_cpt_of_nid);
915
916 int
917 lnet_islocalnet(__u32 net)
918 {
919         struct lnet_ni  *ni;
920         int             cpt;
921
922         cpt = lnet_net_lock_current();
923
924         ni = lnet_net2ni_locked(net, cpt);
925         if (ni != NULL)
926                 lnet_ni_decref_locked(ni, cpt);
927
928         lnet_net_unlock(cpt);
929
930         return ni != NULL;
931 }
932
933 lnet_ni_t  *
934 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
935 {
936         struct lnet_ni  *ni;
937         cfs_list_t      *tmp;
938
939         LASSERT(cpt != LNET_LOCK_EX);
940
941         cfs_list_for_each(tmp, &the_lnet.ln_nis) {
942                 ni = cfs_list_entry(tmp, lnet_ni_t, ni_list);
943
944                 if (ni->ni_nid == nid) {
945                         lnet_ni_addref_locked(ni, cpt);
946                         return ni;
947                 }
948         }
949
950         return NULL;
951 }
952
953 int
954 lnet_islocalnid(lnet_nid_t nid)
955 {
956         struct lnet_ni  *ni;
957         int             cpt;
958
959         cpt = lnet_net_lock_current();
960         ni = lnet_nid2ni_locked(nid, cpt);
961         if (ni != NULL)
962                 lnet_ni_decref_locked(ni, cpt);
963         lnet_net_unlock(cpt);
964
965         return ni != NULL;
966 }
967
968 int
969 lnet_count_acceptor_nis (void)
970 {
971         /* Return the # of NIs that need the acceptor. */
972         int             count = 0;
973 #if defined(__KERNEL__) || defined(HAVE_LIBPTHREAD)
974         cfs_list_t      *tmp;
975         struct lnet_ni  *ni;
976         int             cpt;
977
978         cpt = lnet_net_lock_current();
979         cfs_list_for_each(tmp, &the_lnet.ln_nis) {
980                 ni = cfs_list_entry(tmp, lnet_ni_t, ni_list);
981
982                 if (ni->ni_lnd->lnd_accept != NULL)
983                         count++;
984         }
985
986         lnet_net_unlock(cpt);
987
988 #endif /* defined(__KERNEL__) || defined(HAVE_LIBPTHREAD) */
989         return count;
990 }
991
992 static int
993 lnet_ni_tq_credits(lnet_ni_t *ni)
994 {
995         int     credits;
996
997         LASSERT(ni->ni_ncpts >= 1);
998
999         if (ni->ni_ncpts == 1)
1000                 return ni->ni_maxtxcredits;
1001
1002         credits = ni->ni_maxtxcredits / ni->ni_ncpts;
1003         credits = max(credits, 8 * ni->ni_peertxcredits);
1004         credits = min(credits, ni->ni_maxtxcredits);
1005
1006         return credits;
1007 }
1008
1009 void
1010 lnet_shutdown_lndnis (void)
1011 {
1012         int                i;
1013         int                islo;
1014         lnet_ni_t         *ni;
1015
1016         /* NB called holding the global mutex */
1017
1018         /* All quiet on the API front */
1019         LASSERT(!the_lnet.ln_shutdown);
1020         LASSERT(the_lnet.ln_refcount == 0);
1021         LASSERT(cfs_list_empty(&the_lnet.ln_nis_zombie));
1022         LASSERT(cfs_list_empty(&the_lnet.ln_remote_nets));
1023
1024         lnet_net_lock(LNET_LOCK_EX);
1025         the_lnet.ln_shutdown = 1;       /* flag shutdown */
1026
1027         /* Unlink NIs from the global table */
1028         while (!cfs_list_empty(&the_lnet.ln_nis)) {
1029                 ni = cfs_list_entry(the_lnet.ln_nis.next,
1030                                     lnet_ni_t, ni_list);
1031                 /* move it to zombie list and nobody can find it anymore */
1032                 cfs_list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
1033                 lnet_ni_decref_locked(ni, 0);   /* drop ln_nis' ref */
1034
1035                 if (!cfs_list_empty(&ni->ni_cptlist)) {
1036                         cfs_list_del_init(&ni->ni_cptlist);
1037                         lnet_ni_decref_locked(ni, 0);
1038                 }
1039         }
1040
1041         /* Drop the cached eqwait NI. */
1042         if (the_lnet.ln_eq_waitni != NULL) {
1043                 lnet_ni_decref_locked(the_lnet.ln_eq_waitni, 0);
1044                 the_lnet.ln_eq_waitni = NULL;
1045         }
1046
1047         /* Drop the cached loopback NI. */
1048         if (the_lnet.ln_loni != NULL) {
1049                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
1050                 the_lnet.ln_loni = NULL;
1051         }
1052
1053         lnet_net_unlock(LNET_LOCK_EX);
1054
1055         /* Clear lazy portals and drop delayed messages which hold refs
1056          * on their lnet_msg_t::msg_rxpeer */
1057         for (i = 0; i < the_lnet.ln_nportals; i++)
1058                 LNetClearLazyPortal(i);
1059
1060         /* Clear the peer table and wait for all peers to go (they hold refs on
1061          * their NIs) */
1062         lnet_peer_tables_cleanup();
1063
1064         lnet_net_lock(LNET_LOCK_EX);
1065         /* Now wait for the NI's I just nuked to show up on ln_zombie_nis
1066          * and shut them down in guaranteed thread context */
1067         i = 2;
1068         while (!cfs_list_empty(&the_lnet.ln_nis_zombie)) {
1069                 int     *ref;
1070                 int     j;
1071
1072                 ni = cfs_list_entry(the_lnet.ln_nis_zombie.next,
1073                                     lnet_ni_t, ni_list);
1074                 cfs_list_del_init(&ni->ni_list);
1075                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
1076                         if (*ref == 0)
1077                                 continue;
1078                         /* still busy, add it back to zombie list */
1079                         cfs_list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
1080                         break;
1081                 }
1082
1083                 while (!cfs_list_empty(&ni->ni_list)) {
1084                         lnet_net_unlock(LNET_LOCK_EX);
1085                         ++i;
1086                         if ((i & (-i)) == i) {
1087                                 CDEBUG(D_WARNING,
1088                                        "Waiting for zombie LNI %s\n",
1089                                        libcfs_nid2str(ni->ni_nid));
1090                         }
1091                         cfs_pause(cfs_time_seconds(1));
1092                         lnet_net_lock(LNET_LOCK_EX);
1093                         continue;
1094                 }
1095
1096                 ni->ni_lnd->lnd_refcount--;
1097                 lnet_net_unlock(LNET_LOCK_EX);
1098
1099                 islo = ni->ni_lnd->lnd_type == LOLND;
1100
1101                 LASSERT (!cfs_in_interrupt ());
1102                 (ni->ni_lnd->lnd_shutdown)(ni);
1103
1104                 /* can't deref lnd anymore now; it might have unregistered
1105                  * itself...  */
1106
1107                 if (!islo)
1108                         CDEBUG(D_LNI, "Removed LNI %s\n",
1109                                libcfs_nid2str(ni->ni_nid));
1110
1111                 lnet_ni_free(ni);
1112                 lnet_net_lock(LNET_LOCK_EX);
1113         }
1114
1115         the_lnet.ln_shutdown = 0;
1116         lnet_net_unlock(LNET_LOCK_EX);
1117
1118         if (the_lnet.ln_network_tokens != NULL) {
1119                 LIBCFS_FREE(the_lnet.ln_network_tokens,
1120                             the_lnet.ln_network_tokens_nob);
1121                 the_lnet.ln_network_tokens = NULL;
1122         }
1123 }
1124
1125 int
1126 lnet_startup_lndnis (void)
1127 {
1128         lnd_t                   *lnd;
1129         struct lnet_ni          *ni;
1130         struct lnet_tx_queue    *tq;
1131         cfs_list_t              nilist;
1132         int                     i;
1133         int                rc = 0;
1134         int                lnd_type;
1135         int                nicount = 0;
1136         char              *nets = lnet_get_networks();
1137
1138         CFS_INIT_LIST_HEAD(&nilist);
1139
1140         if (nets == NULL)
1141                 goto failed;
1142
1143         rc = lnet_parse_networks(&nilist, nets);
1144         if (rc != 0)
1145                 goto failed;
1146
1147         while (!cfs_list_empty(&nilist)) {
1148                 ni = cfs_list_entry(nilist.next, lnet_ni_t, ni_list);
1149                 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1150
1151                 LASSERT (libcfs_isknown_lnd(lnd_type));
1152
1153                 if (lnd_type == CIBLND    ||
1154                     lnd_type == OPENIBLND ||
1155                     lnd_type == IIBLND    ||
1156                     lnd_type == VIBLND) {
1157                         CERROR("LND %s obsoleted\n",
1158                                libcfs_lnd2str(lnd_type));
1159                         goto failed;
1160                 }
1161
1162                 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1163                 lnd = lnet_find_lnd_by_type(lnd_type);
1164
1165 #ifdef __KERNEL__
1166                 if (lnd == NULL) {
1167                         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1168                         rc = cfs_request_module("%s",
1169                                                 libcfs_lnd2modname(lnd_type));
1170                         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1171
1172                         lnd = lnet_find_lnd_by_type(lnd_type);
1173                         if (lnd == NULL) {
1174                                 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1175                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
1176                                        libcfs_lnd2str(lnd_type),
1177                                        libcfs_lnd2modname(lnd_type), rc);
1178 #ifndef HAVE_MODULE_LOADING_SUPPORT
1179                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
1180                                          "compiled with kernel module "
1181                                          "loading support.");
1182 #endif
1183                                 goto failed;
1184                         }
1185                 }
1186 #else
1187                 if (lnd == NULL) {
1188                         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1189                         CERROR("LND %s not supported\n",
1190                                libcfs_lnd2str(lnd_type));
1191                         goto failed;
1192                 }
1193 #endif
1194
1195                 lnet_net_lock(LNET_LOCK_EX);
1196                 lnd->lnd_refcount++;
1197                 lnet_net_unlock(LNET_LOCK_EX);
1198
1199                 ni->ni_lnd = lnd;
1200
1201                 rc = (lnd->lnd_startup)(ni);
1202
1203                 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1204
1205                 if (rc != 0) {
1206                         LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s"
1207                                            "\n",
1208                                            rc, libcfs_lnd2str(lnd->lnd_type));
1209                         lnet_net_lock(LNET_LOCK_EX);
1210                         lnd->lnd_refcount--;
1211                         lnet_net_unlock(LNET_LOCK_EX);
1212                         goto failed;
1213                 }
1214
1215                 LASSERT (ni->ni_peertimeout <= 0 || lnd->lnd_query != NULL);
1216
1217                 cfs_list_del(&ni->ni_list);
1218
1219                 lnet_net_lock(LNET_LOCK_EX);
1220                 /* refcount for ln_nis */
1221                 lnet_ni_addref_locked(ni, 0);
1222                 cfs_list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1223                 if (ni->ni_cpts != NULL) {
1224                         cfs_list_add_tail(&ni->ni_cptlist,
1225                                           &the_lnet.ln_nis_cpt);
1226                         lnet_ni_addref_locked(ni, 0);
1227                 }
1228
1229                 lnet_net_unlock(LNET_LOCK_EX);
1230
1231                 if (lnd->lnd_type == LOLND) {
1232                         lnet_ni_addref(ni);
1233                         LASSERT (the_lnet.ln_loni == NULL);
1234                         the_lnet.ln_loni = ni;
1235                         continue;
1236                 }
1237
1238 #ifndef __KERNEL__
1239                 if (lnd->lnd_wait != NULL) {
1240                         if (the_lnet.ln_eq_waitni == NULL) {
1241                                 lnet_ni_addref(ni);
1242                                 the_lnet.ln_eq_waitni = ni;
1243                         }
1244                 } else {
1245 # ifndef HAVE_LIBPTHREAD
1246                         LCONSOLE_ERROR_MSG(0x106, "LND %s not supported in a "
1247                                            "single-threaded runtime\n",
1248                                            libcfs_lnd2str(lnd_type));
1249                         goto failed;
1250 # endif
1251                 }
1252 #endif
1253                 if (ni->ni_peertxcredits == 0 ||
1254                     ni->ni_maxtxcredits == 0) {
1255                         LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1256                                            libcfs_lnd2str(lnd->lnd_type),
1257                                            ni->ni_peertxcredits == 0 ?
1258                                            "" : "per-peer ");
1259                         goto failed;
1260                 }
1261
1262                 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1263                         tq->tq_credits_min =
1264                         tq->tq_credits_max =
1265                         tq->tq_credits = lnet_ni_tq_credits(ni);
1266                 }
1267
1268                 CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1269                        libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1270                        lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1271                        ni->ni_peerrtrcredits, ni->ni_peertimeout);
1272
1273                 nicount++;
1274         }
1275
1276         if (the_lnet.ln_eq_waitni != NULL && nicount > 1) {
1277                 lnd_type = the_lnet.ln_eq_waitni->ni_lnd->lnd_type;
1278                 LCONSOLE_ERROR_MSG(0x109, "LND %s can only run single-network"
1279                                    "\n",
1280                                    libcfs_lnd2str(lnd_type));
1281                 goto failed;
1282         }
1283
1284         return 0;
1285
1286  failed:
1287         lnet_shutdown_lndnis();
1288
1289         while (!cfs_list_empty(&nilist)) {
1290                 ni = cfs_list_entry(nilist.next, lnet_ni_t, ni_list);
1291                 cfs_list_del(&ni->ni_list);
1292                 lnet_ni_free(ni);
1293         }
1294
1295         return -ENETDOWN;
1296 }
1297
1298 /**
1299  * Initialize LNet library.
1300  *
1301  * Only userspace program needs to call this function - it's automatically
1302  * called in the kernel at module loading time. Caller has to call LNetFini()
1303  * after a call to LNetInit(), if and only if the latter returned 0. It must
1304  * be called exactly once.
1305  *
1306  * \return 0 on success, and -ve on failures.
1307  */
1308 int
1309 LNetInit(void)
1310 {
1311         int     rc;
1312
1313         lnet_assert_wire_constants();
1314         LASSERT(!the_lnet.ln_init);
1315
1316         memset(&the_lnet, 0, sizeof(the_lnet));
1317
1318         /* refer to global cfs_cpt_table for now */
1319         the_lnet.ln_cpt_table   = cfs_cpt_table;
1320         the_lnet.ln_cpt_number  = cfs_cpt_number(cfs_cpt_table);
1321
1322         LASSERT(the_lnet.ln_cpt_number > 0);
1323         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1324                 /* we are under risk of consuming all lh_cookie */
1325                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
1326                        "please change setting of CPT-table and retry\n",
1327                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
1328                 return -1;
1329         }
1330
1331         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1332                 the_lnet.ln_cpt_bits++;
1333
1334         rc = lnet_create_locks();
1335         if (rc != 0) {
1336                 CERROR("Can't create LNet global locks: %d\n", rc);
1337                 return -1;
1338         }
1339
1340         the_lnet.ln_refcount = 0;
1341         the_lnet.ln_init = 1;
1342         LNetInvalidateHandle(&the_lnet.ln_rc_eqh);
1343         CFS_INIT_LIST_HEAD(&the_lnet.ln_lnds);
1344         CFS_INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1345         CFS_INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1346
1347 #ifdef __KERNEL__
1348         /* All LNDs apart from the LOLND are in separate modules.  They
1349          * register themselves when their module loads, and unregister
1350          * themselves when their module is unloaded. */
1351 #else
1352         /* Register LNDs
1353          * NB the order here determines default 'networks=' order */
1354 # ifdef HAVE_LIBPTHREAD
1355         LNET_REGISTER_ULND(the_tcplnd);
1356 # endif
1357 #endif
1358         lnet_register_lnd(&the_lolnd);
1359         return 0;
1360 }
1361
1362 /**
1363  * Finalize LNet library.
1364  *
1365  * Only userspace program needs to call this function. It can be called
1366  * at most once.
1367  *
1368  * \pre LNetInit() called with success.
1369  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1370  */
1371 void
1372 LNetFini(void)
1373 {
1374         LASSERT(the_lnet.ln_init);
1375         LASSERT(the_lnet.ln_refcount == 0);
1376
1377         while (!cfs_list_empty(&the_lnet.ln_lnds))
1378                 lnet_unregister_lnd(cfs_list_entry(the_lnet.ln_lnds.next,
1379                                                    lnd_t, lnd_list));
1380         lnet_destroy_locks();
1381
1382         the_lnet.ln_init = 0;
1383 }
1384
1385 /**
1386  * Set LNet PID and start LNet interfaces, routing, and forwarding.
1387  *
1388  * Userspace program should call this after a successful call to LNetInit().
1389  * Users must call this function at least once before any other functions.
1390  * For each successful call there must be a corresponding call to
1391  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1392  * ignored.
1393  *
1394  * The PID used by LNet may be different from the one requested.
1395  * See LNetGetId().
1396  *
1397  * \param requested_pid PID requested by the caller.
1398  *
1399  * \return >= 0 on success, and < 0 error code on failures.
1400  */
1401 int
1402 LNetNIInit(lnet_pid_t requested_pid)
1403 {
1404         int         im_a_router = 0;
1405         int         rc;
1406
1407         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1408
1409         LASSERT (the_lnet.ln_init);
1410         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1411
1412         if (the_lnet.ln_refcount > 0) {
1413                 rc = the_lnet.ln_refcount++;
1414                 goto out;
1415         }
1416
1417         lnet_get_tunables();
1418
1419         if (requested_pid == LNET_PID_ANY) {
1420                 /* Don't instantiate LNET just for me */
1421                 rc = -ENETDOWN;
1422                 goto failed0;
1423         }
1424
1425         rc = lnet_prepare(requested_pid);
1426         if (rc != 0)
1427                 goto failed0;
1428
1429         rc = lnet_startup_lndnis();
1430         if (rc != 0)
1431                 goto failed1;
1432
1433         rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1434         if (rc != 0)
1435                 goto failed2;
1436
1437         rc = lnet_check_routes();
1438         if (rc != 0)
1439                 goto failed2;
1440
1441         rc = lnet_rtrpools_alloc(im_a_router);
1442         if (rc != 0)
1443                 goto failed2;
1444
1445         rc = lnet_acceptor_start();
1446         if (rc != 0)
1447                 goto failed2;
1448
1449         the_lnet.ln_refcount = 1;
1450         /* Now I may use my own API functions... */
1451
1452         /* NB router checker needs the_lnet.ln_ping_info in
1453          * lnet_router_checker -> lnet_update_ni_status_locked */
1454         rc = lnet_ping_target_init();
1455         if (rc != 0)
1456                 goto failed3;
1457
1458         rc = lnet_router_checker_start();
1459         if (rc != 0)
1460                 goto failed4;
1461
1462         lnet_proc_init();
1463         goto out;
1464
1465  failed4:
1466         lnet_ping_target_fini();
1467  failed3:
1468         the_lnet.ln_refcount = 0;
1469         lnet_acceptor_stop();
1470  failed2:
1471         lnet_destroy_routes();
1472         lnet_shutdown_lndnis();
1473  failed1:
1474         lnet_unprepare();
1475  failed0:
1476         LASSERT (rc < 0);
1477  out:
1478         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1479         return rc;
1480 }
1481
1482 /**
1483  * Stop LNet interfaces, routing, and forwarding.
1484  *
1485  * Users must call this function once for each successful call to LNetNIInit().
1486  * Once the LNetNIFini() operation has been started, the results of pending
1487  * API operations are undefined.
1488  *
1489  * \return always 0 for current implementation.
1490  */
1491 int
1492 LNetNIFini()
1493 {
1494         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1495
1496         LASSERT (the_lnet.ln_init);
1497         LASSERT (the_lnet.ln_refcount > 0);
1498
1499         if (the_lnet.ln_refcount != 1) {
1500                 the_lnet.ln_refcount--;
1501         } else {
1502                 LASSERT (!the_lnet.ln_niinit_self);
1503
1504                 lnet_proc_fini();
1505                 lnet_router_checker_stop();
1506                 lnet_ping_target_fini();
1507
1508                 /* Teardown fns that use my own API functions BEFORE here */
1509                 the_lnet.ln_refcount = 0;
1510
1511                 lnet_acceptor_stop();
1512                 lnet_destroy_routes();
1513                 lnet_shutdown_lndnis();
1514                 lnet_unprepare();
1515         }
1516
1517         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1518         return 0;
1519 }
1520
1521 /**
1522  * This is an ugly hack to export IOC_LIBCFS_DEBUG_PEER and
1523  * IOC_LIBCFS_PORTALS_COMPATIBILITY commands to users, by tweaking the LNet
1524  * internal ioctl handler.
1525  *
1526  * IOC_LIBCFS_PORTALS_COMPATIBILITY is now deprecated, don't use it.
1527  *
1528  * \param cmd IOC_LIBCFS_DEBUG_PEER to print debugging data about a peer.
1529  * The data will be printed to system console. Don't use it excessively.
1530  * \param arg A pointer to lnet_process_id_t, process ID of the peer.
1531  *
1532  * \return Always return 0 when called by users directly (i.e., not via ioctl).
1533  */
1534 int
1535 LNetCtl(unsigned int cmd, void *arg)
1536 {
1537         struct libcfs_ioctl_data *data = arg;
1538         lnet_process_id_t         id = {0};
1539         lnet_ni_t                *ni;
1540         int                       rc;
1541
1542         LASSERT (the_lnet.ln_init);
1543         LASSERT (the_lnet.ln_refcount > 0);
1544
1545         switch (cmd) {
1546         case IOC_LIBCFS_GET_NI:
1547                 rc = LNetGetId(data->ioc_count, &id);
1548                 data->ioc_nid = id.nid;
1549                 return rc;
1550
1551         case IOC_LIBCFS_FAIL_NID:
1552                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1553
1554         case IOC_LIBCFS_ADD_ROUTE:
1555                 rc = lnet_add_route(data->ioc_net, data->ioc_count,
1556                                     data->ioc_nid);
1557                 return (rc != 0) ? rc : lnet_check_routes();
1558
1559         case IOC_LIBCFS_DEL_ROUTE:
1560                 return lnet_del_route(data->ioc_net, data->ioc_nid);
1561
1562         case IOC_LIBCFS_GET_ROUTE:
1563                 return lnet_get_route(data->ioc_count,
1564                                       &data->ioc_net, &data->ioc_count,
1565                                       &data->ioc_nid, &data->ioc_flags);
1566         case IOC_LIBCFS_NOTIFY_ROUTER:
1567                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
1568                                    cfs_time_current() -
1569                                    cfs_time_seconds(cfs_time_current_sec() -
1570                                                     (time_t)data->ioc_u64[0]));
1571
1572         case IOC_LIBCFS_PORTALS_COMPATIBILITY:
1573                 /* This can be removed once lustre stops calling it */
1574                 return 0;
1575
1576         case IOC_LIBCFS_LNET_DIST:
1577                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
1578                 if (rc < 0 && rc != -EHOSTUNREACH)
1579                         return rc;
1580
1581                 data->ioc_u32[0] = rc;
1582                 return 0;
1583
1584         case IOC_LIBCFS_TESTPROTOCOMPAT:
1585                 lnet_net_lock(LNET_LOCK_EX);
1586                 the_lnet.ln_testprotocompat = data->ioc_flags;
1587                 lnet_net_unlock(LNET_LOCK_EX);
1588                 return 0;
1589
1590         case IOC_LIBCFS_PING:
1591                 id.nid = data->ioc_nid;
1592                 id.pid = data->ioc_u32[0];
1593                 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
1594                                (lnet_process_id_t *)data->ioc_pbuf1,
1595                                data->ioc_plen1/sizeof(lnet_process_id_t));
1596                 if (rc < 0)
1597                         return rc;
1598                 data->ioc_count = rc;
1599                 return 0;
1600
1601         case IOC_LIBCFS_DEBUG_PEER: {
1602                 /* CAVEAT EMPTOR: this one designed for calling directly; not
1603                  * via an ioctl */
1604                 id = *((lnet_process_id_t *) arg);
1605
1606                 lnet_debug_peer(id.nid);
1607
1608                 ni = lnet_net2ni(LNET_NIDNET(id.nid));
1609                 if (ni == NULL) {
1610                         CDEBUG(D_WARNING, "No NI for %s\n", libcfs_id2str(id));
1611                 } else {
1612                         if (ni->ni_lnd->lnd_ctl == NULL) {
1613                                 CDEBUG(D_WARNING, "No ctl for %s\n",
1614                                        libcfs_id2str(id));
1615                         } else {
1616                                 (void)ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1617                         }
1618
1619                         lnet_ni_decref(ni);
1620                 }
1621                 return 0;
1622         }
1623
1624         default:
1625                 ni = lnet_net2ni(data->ioc_net);
1626                 if (ni == NULL)
1627                         return -EINVAL;
1628
1629                 if (ni->ni_lnd->lnd_ctl == NULL)
1630                         rc = -EINVAL;
1631                 else
1632                         rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1633
1634                 lnet_ni_decref(ni);
1635                 return rc;
1636         }
1637         /* not reached */
1638 }
1639
1640 /**
1641  * Retrieve the lnet_process_id_t ID of LNet interface at \a index. Note that
1642  * all interfaces share a same PID, as requested by LNetNIInit().
1643  *
1644  * \param index Index of the interface to look up.
1645  * \param id On successful return, this location will hold the
1646  * lnet_process_id_t ID of the interface.
1647  *
1648  * \retval 0 If an interface exists at \a index.
1649  * \retval -ENOENT If no interface has been found.
1650  */
1651 int
1652 LNetGetId(unsigned int index, lnet_process_id_t *id)
1653 {
1654         struct lnet_ni  *ni;
1655         cfs_list_t      *tmp;
1656         int             cpt;
1657         int             rc = -ENOENT;
1658
1659         LASSERT(the_lnet.ln_init);
1660         LASSERT(the_lnet.ln_refcount > 0);
1661
1662         cpt = lnet_net_lock_current();
1663
1664         cfs_list_for_each(tmp, &the_lnet.ln_nis) {
1665                 if (index-- != 0)
1666                         continue;
1667
1668                 ni = cfs_list_entry(tmp, lnet_ni_t, ni_list);
1669
1670                 id->nid = ni->ni_nid;
1671                 id->pid = the_lnet.ln_pid;
1672                 rc = 0;
1673                 break;
1674         }
1675
1676         lnet_net_unlock(cpt);
1677         return rc;
1678 }
1679
1680 /**
1681  * Print a string representation of handle \a h into buffer \a str of
1682  * \a len bytes.
1683  */
1684 void
1685 LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
1686 {
1687         snprintf(str, len, LPX64, h.cookie);
1688 }
1689
1690 static int
1691 lnet_create_ping_info(void)
1692 {
1693         int               i;
1694         int               n;
1695         int               rc;
1696         unsigned int      infosz;
1697         lnet_ni_t        *ni;
1698         lnet_process_id_t id;
1699         lnet_ping_info_t *pinfo;
1700
1701         for (n = 0; ; n++) {
1702                 rc = LNetGetId(n, &id);
1703                 if (rc == -ENOENT)
1704                         break;
1705
1706                 LASSERT (rc == 0);
1707         }
1708
1709         infosz = offsetof(lnet_ping_info_t, pi_ni[n]);
1710         LIBCFS_ALLOC(pinfo, infosz);
1711         if (pinfo == NULL) {
1712                 CERROR("Can't allocate ping info[%d]\n", n);
1713                 return -ENOMEM;
1714         }
1715
1716         pinfo->pi_nnis    = n;
1717         pinfo->pi_pid     = the_lnet.ln_pid;
1718         pinfo->pi_magic   = LNET_PROTO_PING_MAGIC;
1719         pinfo->pi_features = LNET_PING_FEAT_NI_STATUS;
1720
1721         for (i = 0; i < n; i++) {
1722                 lnet_ni_status_t *ns = &pinfo->pi_ni[i];
1723
1724                 rc = LNetGetId(i, &id);
1725                 LASSERT (rc == 0);
1726
1727                 ns->ns_nid    = id.nid;
1728                 ns->ns_status = LNET_NI_STATUS_UP;
1729
1730                 lnet_net_lock(0);
1731
1732                 ni = lnet_nid2ni_locked(id.nid, 0);
1733                 LASSERT(ni != NULL);
1734
1735                 lnet_ni_lock(ni);
1736                 LASSERT(ni->ni_status == NULL);
1737                 ni->ni_status = ns;
1738                 lnet_ni_unlock(ni);
1739
1740                 lnet_ni_decref_locked(ni, 0);
1741                 lnet_net_unlock(0);
1742         }
1743
1744         the_lnet.ln_ping_info = pinfo;
1745         return 0;
1746 }
1747
1748 static void
1749 lnet_destroy_ping_info(void)
1750 {
1751         struct lnet_ni  *ni;
1752
1753         lnet_net_lock(0);
1754
1755         cfs_list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
1756                 lnet_ni_lock(ni);
1757                 ni->ni_status = NULL;
1758                 lnet_ni_unlock(ni);
1759         }
1760
1761         lnet_net_unlock(0);
1762
1763         LIBCFS_FREE(the_lnet.ln_ping_info,
1764                     offsetof(lnet_ping_info_t,
1765                              pi_ni[the_lnet.ln_ping_info->pi_nnis]));
1766         the_lnet.ln_ping_info = NULL;
1767         return;
1768 }
1769
1770 int
1771 lnet_ping_target_init(void)
1772 {
1773         lnet_md_t         md = {0};
1774         lnet_handle_me_t  meh;
1775         lnet_process_id_t id;
1776         int               rc;
1777         int               rc2;
1778         int               infosz;
1779
1780         rc = lnet_create_ping_info();
1781         if (rc != 0)
1782                 return rc;
1783
1784         /* We can have a tiny EQ since we only need to see the unlink event on
1785          * teardown, which by definition is the last one! */
1786         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &the_lnet.ln_ping_target_eq);
1787         if (rc != 0) {
1788                 CERROR("Can't allocate ping EQ: %d\n", rc);
1789                 goto failed_0;
1790         }
1791
1792         memset(&id, 0, sizeof(lnet_process_id_t));
1793         id.nid = LNET_NID_ANY;
1794         id.pid = LNET_PID_ANY;
1795
1796         rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1797                           LNET_PROTO_PING_MATCHBITS, 0,
1798                           LNET_UNLINK, LNET_INS_AFTER,
1799                           &meh);
1800         if (rc != 0) {
1801                 CERROR("Can't create ping ME: %d\n", rc);
1802                 goto failed_1;
1803         }
1804
1805         /* initialize md content */
1806         infosz = offsetof(lnet_ping_info_t,
1807                           pi_ni[the_lnet.ln_ping_info->pi_nnis]);
1808         md.start     = the_lnet.ln_ping_info;
1809         md.length    = infosz;
1810         md.threshold = LNET_MD_THRESH_INF;
1811         md.max_size  = 0;
1812         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1813                        LNET_MD_MANAGE_REMOTE;
1814         md.user_ptr  = NULL;
1815         md.eq_handle = the_lnet.ln_ping_target_eq;
1816
1817         rc = LNetMDAttach(meh, md,
1818                           LNET_RETAIN,
1819                           &the_lnet.ln_ping_target_md);
1820         if (rc != 0) {
1821                 CERROR("Can't attach ping MD: %d\n", rc);
1822                 goto failed_2;
1823         }
1824
1825         return 0;
1826
1827  failed_2:
1828         rc2 = LNetMEUnlink(meh);
1829         LASSERT (rc2 == 0);
1830  failed_1:
1831         rc2 = LNetEQFree(the_lnet.ln_ping_target_eq);
1832         LASSERT (rc2 == 0);
1833  failed_0:
1834         lnet_destroy_ping_info();
1835         return rc;
1836 }
1837
1838 void
1839 lnet_ping_target_fini(void)
1840 {
1841         lnet_event_t    event;
1842         int             rc;
1843         int             which;
1844         int             timeout_ms = 1000;
1845         cfs_sigset_t    blocked = cfs_block_allsigs();
1846
1847         LNetMDUnlink(the_lnet.ln_ping_target_md);
1848         /* NB md could be busy; this just starts the unlink */
1849
1850         for (;;) {
1851                 rc = LNetEQPoll(&the_lnet.ln_ping_target_eq, 1,
1852                                 timeout_ms, &event, &which);
1853
1854                 /* I expect overflow... */
1855                 LASSERT (rc >= 0 || rc == -EOVERFLOW);
1856
1857                 if (rc == 0) {
1858                         /* timed out: provide a diagnostic */
1859                         CWARN("Still waiting for ping MD to unlink\n");
1860                         timeout_ms *= 2;
1861                         continue;
1862                 }
1863
1864                 /* Got a valid event */
1865                 if (event.unlinked)
1866                         break;
1867         }
1868
1869         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1870         LASSERT (rc == 0);
1871         lnet_destroy_ping_info();
1872         cfs_restore_sigs(blocked);
1873 }
1874
1875 int
1876 lnet_ping (lnet_process_id_t id, int timeout_ms, lnet_process_id_t *ids, int n_ids)
1877 {
1878         lnet_handle_eq_t     eqh;
1879         lnet_handle_md_t     mdh;
1880         lnet_event_t         event;
1881         lnet_md_t            md = {0};
1882         int                  which;
1883         int                  unlinked = 0;
1884         int                  replied = 0;
1885         const int            a_long_time = 60000; /* mS */
1886         int                  infosz = offsetof(lnet_ping_info_t, pi_ni[n_ids]);
1887         lnet_ping_info_t    *info;
1888         lnet_process_id_t    tmpid;
1889         int                  i;
1890         int                  nob;
1891         int                  rc;
1892         int                  rc2;
1893         cfs_sigset_t         blocked;
1894
1895         if (n_ids <= 0 ||
1896             id.nid == LNET_NID_ANY ||
1897             timeout_ms > 500000 ||              /* arbitrary limit! */
1898             n_ids > 20)                         /* arbitrary limit! */
1899                 return -EINVAL;
1900
1901         if (id.pid == LNET_PID_ANY)
1902                 id.pid = LUSTRE_SRV_LNET_PID;
1903
1904         LIBCFS_ALLOC(info, infosz);
1905         if (info == NULL)
1906                 return -ENOMEM;
1907
1908         /* NB 2 events max (including any unlink event) */
1909         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
1910         if (rc != 0) {
1911                 CERROR("Can't allocate EQ: %d\n", rc);
1912                 goto out_0;
1913         }
1914
1915         /* initialize md content */
1916         md.start     = info;
1917         md.length    = infosz;
1918         md.threshold = 2; /*GET/REPLY*/
1919         md.max_size  = 0;
1920         md.options   = LNET_MD_TRUNCATE;
1921         md.user_ptr  = NULL;
1922         md.eq_handle = eqh;
1923
1924         rc = LNetMDBind(md, LNET_UNLINK, &mdh);
1925         if (rc != 0) {
1926                 CERROR("Can't bind MD: %d\n", rc);
1927                 goto out_1;
1928         }
1929
1930         rc = LNetGet(LNET_NID_ANY, mdh, id,
1931                      LNET_RESERVED_PORTAL,
1932                      LNET_PROTO_PING_MATCHBITS, 0);
1933
1934         if (rc != 0) {
1935                 /* Don't CERROR; this could be deliberate! */
1936
1937                 rc2 = LNetMDUnlink(mdh);
1938                 LASSERT (rc2 == 0);
1939
1940                 /* NB must wait for the UNLINK event below... */
1941                 unlinked = 1;
1942                 timeout_ms = a_long_time;
1943         }
1944
1945         do {
1946                 /* MUST block for unlink to complete */
1947                 if (unlinked)
1948                         blocked = cfs_block_allsigs();
1949
1950                 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
1951
1952                 if (unlinked)
1953                         cfs_restore_sigs(blocked);
1954
1955                 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
1956                        (rc2 <= 0) ? -1 : event.type,
1957                        (rc2 <= 0) ? -1 : event.status,
1958                        (rc2 > 0 && event.unlinked) ? " unlinked" : "");
1959
1960                 LASSERT (rc2 != -EOVERFLOW);     /* can't miss anything */
1961
1962                 if (rc2 <= 0 || event.status != 0) {
1963                         /* timeout or error */
1964                         if (!replied && rc == 0)
1965                                 rc = (rc2 < 0) ? rc2 :
1966                                      (rc2 == 0) ? -ETIMEDOUT :
1967                                      event.status;
1968
1969                         if (!unlinked) {
1970                                 /* Ensure completion in finite time... */
1971                                 LNetMDUnlink(mdh);
1972                                 /* No assertion (racing with network) */
1973                                 unlinked = 1;
1974                                 timeout_ms = a_long_time;
1975                         } else if (rc2 == 0) {
1976                                 /* timed out waiting for unlink */
1977                                 CWARN("ping %s: late network completion\n",
1978                                       libcfs_id2str(id));
1979                         }
1980                 } else if (event.type == LNET_EVENT_REPLY) {
1981                         replied = 1;
1982                         rc = event.mlength;
1983                 }
1984
1985         } while (rc2 <= 0 || !event.unlinked);
1986
1987         if (!replied) {
1988                 if (rc >= 0)
1989                         CWARN("%s: Unexpected rc >= 0 but no reply!\n",
1990                               libcfs_id2str(id));
1991                 rc = -EIO;
1992                 goto out_1;
1993         }
1994
1995         nob = rc;
1996         LASSERT (nob >= 0 && nob <= infosz);
1997
1998         rc = -EPROTO;                           /* if I can't parse... */
1999
2000         if (nob < 8) {
2001                 /* can't check magic/version */
2002                 CERROR("%s: ping info too short %d\n",
2003                        libcfs_id2str(id), nob);
2004                 goto out_1;
2005         }
2006
2007         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
2008                 lnet_swap_pinginfo(info);
2009         } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
2010                 CERROR("%s: Unexpected magic %08x\n", 
2011                        libcfs_id2str(id), info->pi_magic);
2012                 goto out_1;
2013         }
2014
2015         if ((info->pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
2016                 CERROR("%s: ping w/o NI status: 0x%x\n",
2017                        libcfs_id2str(id), info->pi_features);
2018                 goto out_1;
2019         }
2020
2021         if (nob < offsetof(lnet_ping_info_t, pi_ni[0])) {
2022                 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
2023                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[0]));
2024                 goto out_1;
2025         }
2026
2027         if (info->pi_nnis < n_ids)
2028                 n_ids = info->pi_nnis;
2029
2030         if (nob < offsetof(lnet_ping_info_t, pi_ni[n_ids])) {
2031                 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
2032                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[n_ids]));
2033                 goto out_1;
2034         }
2035
2036         rc = -EFAULT;                           /* If I SEGV... */
2037
2038         for (i = 0; i < n_ids; i++) {
2039                 tmpid.pid = info->pi_pid;
2040                 tmpid.nid = info->pi_ni[i].ns_nid;
2041 #ifdef __KERNEL__
2042                 if (cfs_copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
2043                         goto out_1;
2044 #else
2045                 ids[i] = tmpid;
2046 #endif
2047         }
2048         rc = info->pi_nnis;
2049
2050  out_1:
2051         rc2 = LNetEQFree(eqh);
2052         if (rc2 != 0)
2053                 CERROR("rc2 %d\n", rc2);
2054         LASSERT (rc2 == 0);
2055
2056  out_0:
2057         LIBCFS_FREE(info, infosz);
2058         return rc;
2059 }