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staging/lustre/libcfs: fix issues found by Klocwork Insight tool
[deliverable/linux.git] / drivers / staging / lustre / lnet / lnet / api-ni.c
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d7e09d03
PT		 1/*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26/*
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
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 <linux/lnet/lib-lnet.h>
39#include <linux/log2.h>
40
41#define D_LNI D_CONSOLE
42
43lnet_t the_lnet; /* THE state of the network */
44EXPORT_SYMBOL(the_lnet);
45
46
47static char *ip2nets = "";
8cc7b4b9
PT		 48module_param(ip2nets, charp, 0444);
49MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
d7e09d03
PT		 50
51static char *networks = "";
8cc7b4b9
PT		 52module_param(networks, charp, 0444);
53MODULE_PARM_DESC(networks, "local networks");
d7e09d03
PT		 54
55static char *routes = "";
8cc7b4b9
PT		 56module_param(routes, charp, 0444);
57MODULE_PARM_DESC(routes, "routes to non-local networks");
d7e09d03
PT		 58
59static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
8cc7b4b9
PT		 60module_param(rnet_htable_size, int, 0444);
61MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
d7e09d03
PT		 62
63char *
64lnet_get_routes(void)
65{
66 return routes;
67}
68
69char *
70lnet_get_networks(void)
71{
72 char *nets;
73 int rc;
74
75 if (*networks != 0 && *ip2nets != 0) {
76 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
77 "'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
92void
93lnet_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
101void
102lnet_fini_locks(void)
103{
104}
105
106
107static int
108lnet_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
127static void
128lnet_destroy_remote_nets_table(void)
129{
130 int i;
131 struct list_head *hash;
132
133 if (the_lnet.ln_remote_nets_hash == NULL)
134 return;
135
136 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
137 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
138
139 LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
140 LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
141 the_lnet.ln_remote_nets_hash = NULL;
142}
143
144static void
145lnet_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
160static int
161lnet_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
180void 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
273lnd_t *
274lnet_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
290void
291lnet_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}
306EXPORT_SYMBOL(lnet_register_lnd);
307
308void
309lnet_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}
322EXPORT_SYMBOL(lnet_unregister_lnd);
323
324void
325lnet_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;
b3d0dfe5 341 counters->drop_count += ctr->drop_count;
d7e09d03
PT		 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}
350EXPORT_SYMBOL(lnet_counters_get);
351
352void
353lnet_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}
365EXPORT_SYMBOL(lnet_counters_reset);
366
367#ifdef LNET_USE_LIB_FREELIST
368
369int
370lnet_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 {
389 memset (space, 0, size);
390 list_add ((struct list_head *)space, &fl->fl_list);
391 space += size;
392 } while (--n != 0);
393
394 return (0);
395}
396
397void
398lnet_freelist_fini (lnet_freelist_t *fl)
399{
400 struct list_head *el;
401 int count;
402
403 if (fl->fl_nobjs == 0)
404 return;
405
406 count = 0;
407 for (el = fl->fl_list.next; el != &fl->fl_list; el = el->next)
408 count++;
409
410 LASSERT (count == fl->fl_nobjs);
411
412 LIBCFS_FREE(fl->fl_objs, fl->fl_nobjs * fl->fl_objsize);
413 memset (fl, 0, sizeof (*fl));
414}
415
416#endif /* LNET_USE_LIB_FREELIST */
417
418__u64
419lnet_create_interface_cookie (void)
420{
421 /* NB the interface cookie in wire handles guards against delayed
422 * replies and ACKs appearing valid after reboot. Initialisation time,
423 * even if it's only implemented to millisecond resolution is probably
424 * easily good enough. */
425 struct timeval tv;
426 __u64 cookie;
427 do_gettimeofday(&tv);
428 cookie = tv.tv_sec;
429 cookie *= 1000000;
430 cookie += tv.tv_usec;
431 return cookie;
432}
433
434static char *
435lnet_res_type2str(int type)
436{
437 switch (type) {
438 default:
439 LBUG();
440 case LNET_COOKIE_TYPE_MD:
441 return "MD";
442 case LNET_COOKIE_TYPE_ME:
443 return "ME";
444 case LNET_COOKIE_TYPE_EQ:
445 return "EQ";
446 }
447}
448
449void
450lnet_res_container_cleanup(struct lnet_res_container *rec)
451{
452 int count = 0;
453
454 if (rec->rec_type == 0) /* not set yet, it's uninitialized */
455 return;
456
457 while (!list_empty(&rec->rec_active)) {
458 struct list_head *e = rec->rec_active.next;
459
460 list_del_init(e);
461 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
462 lnet_eq_free(list_entry(e, lnet_eq_t, eq_list));
463
464 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
465 lnet_md_free(list_entry(e, lnet_libmd_t, md_list));
466
467 } else { /* NB: Active MEs should be attached on portals */
468 LBUG();
469 }
470 count++;
471 }
472
473 if (count > 0) {
474 /* Found alive MD/ME/EQ, user really should unlink/free
475 * all of them before finalize LNet, but if someone didn't,
476 * we have to recycle garbage for him */
477 CERROR("%d active elements on exit of %s container\n",
478 count, lnet_res_type2str(rec->rec_type));
479 }
480
481#ifdef LNET_USE_LIB_FREELIST
482 lnet_freelist_fini(&rec->rec_freelist);
483#endif
484 if (rec->rec_lh_hash != NULL) {
485 LIBCFS_FREE(rec->rec_lh_hash,
486 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
487 rec->rec_lh_hash = NULL;
488 }
489
490 rec->rec_type = 0; /* mark it as finalized */
491}
492
493int
494lnet_res_container_setup(struct lnet_res_container *rec,
495 int cpt, int type, int objnum, int objsz)
496{
497 int rc = 0;
498 int i;
499
500 LASSERT(rec->rec_type == 0);
501
502 rec->rec_type = type;
503 INIT_LIST_HEAD(&rec->rec_active);
504
505#ifdef LNET_USE_LIB_FREELIST
506 memset(&rec->rec_freelist, 0, sizeof(rec->rec_freelist));
507 rc = lnet_freelist_init(&rec->rec_freelist, objnum, objsz);
508 if (rc != 0)
509 goto out;
510#endif
511 rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
512
513 /* Arbitrary choice of hash table size */
514 LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
515 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
516 if (rec->rec_lh_hash == NULL) {
517 rc = -ENOMEM;
518 goto out;
519 }
520
521 for (i = 0; i < LNET_LH_HASH_SIZE; i++)
522 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
523
524 return 0;
525
526out:
527 CERROR("Failed to setup %s resource container\n",
528 lnet_res_type2str(type));
529 lnet_res_container_cleanup(rec);
530 return rc;
531}
532
533static void
534lnet_res_containers_destroy(struct lnet_res_container **recs)
535{
536 struct lnet_res_container *rec;
537 int i;
538
539 cfs_percpt_for_each(rec, i, recs)
540 lnet_res_container_cleanup(rec);
541
542 cfs_percpt_free(recs);
543}
544
545static struct lnet_res_container **
546lnet_res_containers_create(int type, int objnum, int objsz)
547{
548 struct lnet_res_container **recs;
549 struct lnet_res_container *rec;
550 int rc;
551 int i;
552
553 recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
554 if (recs == NULL) {
555 CERROR("Failed to allocate %s resource containers\n",
556 lnet_res_type2str(type));
557 return NULL;
558 }
559
560 cfs_percpt_for_each(rec, i, recs) {
561 rc = lnet_res_container_setup(rec, i, type, objnum, objsz);
562 if (rc != 0) {
563 lnet_res_containers_destroy(recs);
564 return NULL;
565 }
566 }
567
568 return recs;
569}
570
571lnet_libhandle_t *
572lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
573{
574 /* ALWAYS called with lnet_res_lock held */
575 struct list_head *head;
576 lnet_libhandle_t *lh;
577 unsigned int hash;
578
579 if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
580 return NULL;
581
582 hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
583 head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
584
585 list_for_each_entry(lh, head, lh_hash_chain) {
586 if (lh->lh_cookie == cookie)
587 return lh;
588 }
589
590 return NULL;
591}
592
593void
594lnet_res_lh_initialize(struct lnet_res_container *rec, lnet_libhandle_t *lh)
595{
596 /* ALWAYS called with lnet_res_lock held */
597 unsigned int ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
598 unsigned int hash;
599
600 lh->lh_cookie = rec->rec_lh_cookie;
601 rec->rec_lh_cookie += 1 << ibits;
602
603 hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
604
605 list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
606}
607
608
609int lnet_unprepare(void);
610
611int
612lnet_prepare(lnet_pid_t requested_pid)
613{
614 /* Prepare to bring up the network */
615 struct lnet_res_container **recs;
616 int rc = 0;
617
618 LASSERT (the_lnet.ln_refcount == 0);
619
620 the_lnet.ln_routing = 0;
621
622 LASSERT ((requested_pid & LNET_PID_USERFLAG) == 0);
623 the_lnet.ln_pid = requested_pid;
624
625 INIT_LIST_HEAD(&the_lnet.ln_test_peers);
626 INIT_LIST_HEAD(&the_lnet.ln_nis);
627 INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
628 INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
629 INIT_LIST_HEAD(&the_lnet.ln_routers);
630
631 rc = lnet_create_remote_nets_table();
632 if (rc != 0)
633 goto failed;
634
635 the_lnet.ln_interface_cookie = lnet_create_interface_cookie();
636
637 the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
638 sizeof(lnet_counters_t));
639 if (the_lnet.ln_counters == NULL) {
640 CERROR("Failed to allocate counters for LNet\n");
641 rc = -ENOMEM;
642 goto failed;
643 }
644
645 rc = lnet_peer_tables_create();
646 if (rc != 0)
647 goto failed;
648
649 rc = lnet_msg_containers_create();
650 if (rc != 0)
651 goto failed;
652
653 rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
654 LNET_COOKIE_TYPE_EQ, LNET_FL_MAX_EQS,
655 sizeof(lnet_eq_t));
656 if (rc != 0)
657 goto failed;
658
659 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME, LNET_FL_MAX_MES,
660 sizeof(lnet_me_t));
661 if (recs == NULL)
662 goto failed;
663
664 the_lnet.ln_me_containers = recs;
665
666 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD, LNET_FL_MAX_MDS,
667 sizeof(lnet_libmd_t));
668 if (recs == NULL)
669 goto failed;
670
671 the_lnet.ln_md_containers = recs;
672
673 rc = lnet_portals_create();
674 if (rc != 0) {
675 CERROR("Failed to create portals for LNet: %d\n", rc);
676 goto failed;
677 }
678
679 return 0;
680
681 failed:
682 lnet_unprepare();
683 return rc;
684}
685
686int
687lnet_unprepare (void)
688{
689 /* NB no LNET_LOCK since this is the last reference. All LND instances
690 * have shut down already, so it is safe to unlink and free all
691 * descriptors, even those that appear committed to a network op (eg MD
692 * with non-zero pending count) */
693
694 lnet_fail_nid(LNET_NID_ANY, 0);
695
696 LASSERT(the_lnet.ln_refcount == 0);
697 LASSERT(list_empty(&the_lnet.ln_test_peers));
698 LASSERT(list_empty(&the_lnet.ln_nis));
699 LASSERT(list_empty(&the_lnet.ln_nis_cpt));
700 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
701
702 lnet_portals_destroy();
703
704 if (the_lnet.ln_md_containers != NULL) {
705 lnet_res_containers_destroy(the_lnet.ln_md_containers);
706 the_lnet.ln_md_containers = NULL;
707 }
708
709 if (the_lnet.ln_me_containers != NULL) {
710 lnet_res_containers_destroy(the_lnet.ln_me_containers);
711 the_lnet.ln_me_containers = NULL;
712 }
713
714 lnet_res_container_cleanup(&the_lnet.ln_eq_container);
715
716 lnet_msg_containers_destroy();
717 lnet_peer_tables_destroy();
718 lnet_rtrpools_free();
719
720 if (the_lnet.ln_counters != NULL) {
721 cfs_percpt_free(the_lnet.ln_counters);
722 the_lnet.ln_counters = NULL;
723 }
724 lnet_destroy_remote_nets_table();
725
726 return 0;
727}
728
729lnet_ni_t *
730lnet_net2ni_locked(__u32 net, int cpt)
731{
732 struct list_head *tmp;
733 lnet_ni_t *ni;
734
735 LASSERT(cpt != LNET_LOCK_EX);
736
737 list_for_each(tmp, &the_lnet.ln_nis) {
738 ni = list_entry(tmp, lnet_ni_t, ni_list);
739
740 if (LNET_NIDNET(ni->ni_nid) == net) {
741 lnet_ni_addref_locked(ni, cpt);
742 return ni;
743 }
744 }
745
746 return NULL;
747}
748
749lnet_ni_t *
750lnet_net2ni(__u32 net)
751{
752 lnet_ni_t *ni;
753
754 lnet_net_lock(0);
755 ni = lnet_net2ni_locked(net, 0);
756 lnet_net_unlock(0);
757
758 return ni;
759}
760EXPORT_SYMBOL(lnet_net2ni);
761
762static unsigned int
763lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
764{
765 __u64 key = nid;
766 unsigned int val;
767
768 LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
769
770 if (number == 1)
771 return 0;
772
72c0824a 773 val = hash_long(key, LNET_CPT_BITS);
d7e09d03
PT		 774 /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
775 if (val < number)
776 return val;
777
778 return (unsigned int)(key + val + (val >> 1)) % number;
779}
780
781int
782lnet_cpt_of_nid_locked(lnet_nid_t nid)
783{
784 struct lnet_ni *ni;
785
786 /* must called with hold of lnet_net_lock */
787 if (LNET_CPT_NUMBER == 1)
788 return 0; /* the only one */
789
790 /* take lnet_net_lock(any) would be OK */
791 if (!list_empty(&the_lnet.ln_nis_cpt)) {
792 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
793 if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
794 continue;
795
796 LASSERT(ni->ni_cpts != NULL);
797 return ni->ni_cpts[lnet_nid_cpt_hash
798 (nid, ni->ni_ncpts)];
799 }
800 }
801
802 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
803}
804
805int
806lnet_cpt_of_nid(lnet_nid_t nid)
807{
808 int cpt;
809 int cpt2;
810
811 if (LNET_CPT_NUMBER == 1)
812 return 0; /* the only one */
813
814 if (list_empty(&the_lnet.ln_nis_cpt))
815 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
816
817 cpt = lnet_net_lock_current();
818 cpt2 = lnet_cpt_of_nid_locked(nid);
819 lnet_net_unlock(cpt);
820
821 return cpt2;
822}
823EXPORT_SYMBOL(lnet_cpt_of_nid);
824
825int
826lnet_islocalnet(__u32 net)
827{
828 struct lnet_ni *ni;
829 int cpt;
830
831 cpt = lnet_net_lock_current();
832
833 ni = lnet_net2ni_locked(net, cpt);
834 if (ni != NULL)
835 lnet_ni_decref_locked(ni, cpt);
836
837 lnet_net_unlock(cpt);
838
839 return ni != NULL;
840}
841
842lnet_ni_t *
843lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
844{
845 struct lnet_ni *ni;
846 struct list_head *tmp;
847
848 LASSERT(cpt != LNET_LOCK_EX);
849
850 list_for_each(tmp, &the_lnet.ln_nis) {
851 ni = list_entry(tmp, lnet_ni_t, ni_list);
852
853 if (ni->ni_nid == nid) {
854 lnet_ni_addref_locked(ni, cpt);
855 return ni;
856 }
857 }
858
859 return NULL;
860}
861
862int
863lnet_islocalnid(lnet_nid_t nid)
864{
865 struct lnet_ni *ni;
866 int cpt;
867
868 cpt = lnet_net_lock_current();
869 ni = lnet_nid2ni_locked(nid, cpt);
870 if (ni != NULL)
871 lnet_ni_decref_locked(ni, cpt);
872 lnet_net_unlock(cpt);
873
874 return ni != NULL;
875}
876
877int
878lnet_count_acceptor_nis (void)
879{
880 /* Return the # of NIs that need the acceptor. */
881 int count = 0;
882 struct list_head *tmp;
883 struct lnet_ni *ni;
884 int cpt;
885
886 cpt = lnet_net_lock_current();
887 list_for_each(tmp, &the_lnet.ln_nis) {
888 ni = list_entry(tmp, lnet_ni_t, ni_list);
889
890 if (ni->ni_lnd->lnd_accept != NULL)
891 count++;
892 }
893
894 lnet_net_unlock(cpt);
895
896 return count;
897}
898
899static int
900lnet_ni_tq_credits(lnet_ni_t *ni)
901{
902 int credits;
903
904 LASSERT(ni->ni_ncpts >= 1);
905
906 if (ni->ni_ncpts == 1)
907 return ni->ni_maxtxcredits;
908
909 credits = ni->ni_maxtxcredits / ni->ni_ncpts;
910 credits = max(credits, 8 * ni->ni_peertxcredits);
911 credits = min(credits, ni->ni_maxtxcredits);
912
913 return credits;
914}
915
916void
917lnet_shutdown_lndnis (void)
918{
919 int i;
920 int islo;
921 lnet_ni_t *ni;
922
923 /* NB called holding the global mutex */
924
925 /* All quiet on the API front */
926 LASSERT(!the_lnet.ln_shutdown);
927 LASSERT(the_lnet.ln_refcount == 0);
928 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
929
930 lnet_net_lock(LNET_LOCK_EX);
931 the_lnet.ln_shutdown = 1; /* flag shutdown */
932
933 /* Unlink NIs from the global table */
934 while (!list_empty(&the_lnet.ln_nis)) {
935 ni = list_entry(the_lnet.ln_nis.next,
936 lnet_ni_t, ni_list);
937 /* move it to zombie list and nobody can find it anymore */
938 list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
939 lnet_ni_decref_locked(ni, 0); /* drop ln_nis' ref */
940
941 if (!list_empty(&ni->ni_cptlist)) {
942 list_del_init(&ni->ni_cptlist);
943 lnet_ni_decref_locked(ni, 0);
944 }
945 }
946
947 /* Drop the cached eqwait NI. */
948 if (the_lnet.ln_eq_waitni != NULL) {
949 lnet_ni_decref_locked(the_lnet.ln_eq_waitni, 0);
950 the_lnet.ln_eq_waitni = NULL;
951 }
952
953 /* Drop the cached loopback NI. */
954 if (the_lnet.ln_loni != NULL) {
955 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
956 the_lnet.ln_loni = NULL;
957 }
958
959 lnet_net_unlock(LNET_LOCK_EX);
960
961 /* Clear lazy portals and drop delayed messages which hold refs
962 * on their lnet_msg_t::msg_rxpeer */
963 for (i = 0; i < the_lnet.ln_nportals; i++)
964 LNetClearLazyPortal(i);
965
966 /* Clear the peer table and wait for all peers to go (they hold refs on
967 * their NIs) */
968 lnet_peer_tables_cleanup();
969
970 lnet_net_lock(LNET_LOCK_EX);
971 /* Now wait for the NI's I just nuked to show up on ln_zombie_nis
972 * and shut them down in guaranteed thread context */
973 i = 2;
974 while (!list_empty(&the_lnet.ln_nis_zombie)) {
975 int *ref;
976 int j;
977
978 ni = list_entry(the_lnet.ln_nis_zombie.next,
979 lnet_ni_t, ni_list);
980 list_del_init(&ni->ni_list);
981 cfs_percpt_for_each(ref, j, ni->ni_refs) {
982 if (*ref == 0)
983 continue;
984 /* still busy, add it back to zombie list */
985 list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
986 break;
987 }
988
989 while (!list_empty(&ni->ni_list)) {
990 lnet_net_unlock(LNET_LOCK_EX);
991 ++i;
992 if ((i & (-i)) == i) {
993 CDEBUG(D_WARNING,
994 "Waiting for zombie LNI %s\n",
995 libcfs_nid2str(ni->ni_nid));
996 }
d3caf4d5
PT		 997 set_current_state(TASK_UNINTERRUPTIBLE);
998 schedule_timeout(cfs_time_seconds(1));
d7e09d03
PT		 999 lnet_net_lock(LNET_LOCK_EX);
1000 continue;
1001 }
1002
1003 ni->ni_lnd->lnd_refcount--;
1004 lnet_net_unlock(LNET_LOCK_EX);
1005
1006 islo = ni->ni_lnd->lnd_type == LOLND;
1007
1008 LASSERT (!in_interrupt ());
1009 (ni->ni_lnd->lnd_shutdown)(ni);
1010
1011 /* can't deref lnd anymore now; it might have unregistered
1012 * itself... */
1013
1014 if (!islo)
1015 CDEBUG(D_LNI, "Removed LNI %s\n",
1016 libcfs_nid2str(ni->ni_nid));
1017
1018 lnet_ni_free(ni);
1019 lnet_net_lock(LNET_LOCK_EX);
1020 }
1021
1022 the_lnet.ln_shutdown = 0;
1023 lnet_net_unlock(LNET_LOCK_EX);
1024
1025 if (the_lnet.ln_network_tokens != NULL) {
1026 LIBCFS_FREE(the_lnet.ln_network_tokens,
1027 the_lnet.ln_network_tokens_nob);
1028 the_lnet.ln_network_tokens = NULL;
1029 }
1030}
1031
1032int
1033lnet_startup_lndnis (void)
1034{
1035 lnd_t *lnd;
1036 struct lnet_ni *ni;
1037 struct lnet_tx_queue *tq;
1038 struct list_head nilist;
1039 int i;
1040 int rc = 0;
1041 int lnd_type;
1042 int nicount = 0;
1043 char *nets = lnet_get_networks();
1044
1045 INIT_LIST_HEAD(&nilist);
1046
1047 if (nets == NULL)
1048 goto failed;
1049
1050 rc = lnet_parse_networks(&nilist, nets);
1051 if (rc != 0)
1052 goto failed;
1053
1054 while (!list_empty(&nilist)) {
1055 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
1056 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1057
1058 LASSERT (libcfs_isknown_lnd(lnd_type));
1059
1060 if (lnd_type == CIBLND ||
1061 lnd_type == OPENIBLND ||
1062 lnd_type == IIBLND ||
1063 lnd_type == VIBLND) {
1064 CERROR("LND %s obsoleted\n",
1065 libcfs_lnd2str(lnd_type));
1066 goto failed;
1067 }
1068
1069 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1070 lnd = lnet_find_lnd_by_type(lnd_type);
1071
1072 if (lnd == NULL) {
1073 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1074 rc = request_module("%s",
1075 libcfs_lnd2modname(lnd_type));
1076 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1077
1078 lnd = lnet_find_lnd_by_type(lnd_type);
1079 if (lnd == NULL) {
1080 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1081 CERROR("Can't load LND %s, module %s, rc=%d\n",
1082 libcfs_lnd2str(lnd_type),
1083 libcfs_lnd2modname(lnd_type), rc);
1084 goto failed;
1085 }
1086 }
1087
1088 lnet_net_lock(LNET_LOCK_EX);
1089 lnd->lnd_refcount++;
1090 lnet_net_unlock(LNET_LOCK_EX);
1091
1092 ni->ni_lnd = lnd;
1093
1094 rc = (lnd->lnd_startup)(ni);
1095
1096 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1097
1098 if (rc != 0) {
1099 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s"
1100 "\n",
1101 rc, libcfs_lnd2str(lnd->lnd_type));
1102 lnet_net_lock(LNET_LOCK_EX);
1103 lnd->lnd_refcount--;
1104 lnet_net_unlock(LNET_LOCK_EX);
1105 goto failed;
1106 }
1107
1108 LASSERT (ni->ni_peertimeout <= 0 || lnd->lnd_query != NULL);
1109
1110 list_del(&ni->ni_list);
1111
1112 lnet_net_lock(LNET_LOCK_EX);
1113 /* refcount for ln_nis */
1114 lnet_ni_addref_locked(ni, 0);
1115 list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1116 if (ni->ni_cpts != NULL) {
1117 list_add_tail(&ni->ni_cptlist,
1118 &the_lnet.ln_nis_cpt);
1119 lnet_ni_addref_locked(ni, 0);
1120 }
1121
1122 lnet_net_unlock(LNET_LOCK_EX);
1123
1124 if (lnd->lnd_type == LOLND) {
1125 lnet_ni_addref(ni);
1126 LASSERT (the_lnet.ln_loni == NULL);
1127 the_lnet.ln_loni = ni;
1128 continue;
1129 }
1130
1131 if (ni->ni_peertxcredits == 0 ||
1132 ni->ni_maxtxcredits == 0) {
1133 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1134 libcfs_lnd2str(lnd->lnd_type),
1135 ni->ni_peertxcredits == 0 ?
1136 "" : "per-peer ");
1137 goto failed;
1138 }
1139
1140 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1141 tq->tq_credits_min =
1142 tq->tq_credits_max =
1143 tq->tq_credits = lnet_ni_tq_credits(ni);
1144 }
1145
1146 CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1147 libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1148 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1149 ni->ni_peerrtrcredits, ni->ni_peertimeout);
1150
1151 nicount++;
1152 }
1153
1154 if (the_lnet.ln_eq_waitni != NULL && nicount > 1) {
1155 lnd_type = the_lnet.ln_eq_waitni->ni_lnd->lnd_type;
1156 LCONSOLE_ERROR_MSG(0x109, "LND %s can only run single-network"
1157 "\n",
1158 libcfs_lnd2str(lnd_type));
1159 goto failed;
1160 }
1161
1162 return 0;
1163
1164 failed:
1165 lnet_shutdown_lndnis();
1166
1167 while (!list_empty(&nilist)) {
1168 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
1169 list_del(&ni->ni_list);
1170 lnet_ni_free(ni);
1171 }
1172
1173 return -ENETDOWN;
1174}
1175
1176/**
1177 * Initialize LNet library.
1178 *
1179 * Only userspace program needs to call this function - it's automatically
1180 * called in the kernel at module loading time. Caller has to call LNetFini()
1181 * after a call to LNetInit(), if and only if the latter returned 0. It must
1182 * be called exactly once.
1183 *
1184 * \return 0 on success, and -ve on failures.
1185 */
1186int
1187LNetInit(void)
1188{
1189 int rc;
1190
1191 lnet_assert_wire_constants();
1192 LASSERT(!the_lnet.ln_init);
1193
1194 memset(&the_lnet, 0, sizeof(the_lnet));
1195
1196 /* refer to global cfs_cpt_table for now */
1197 the_lnet.ln_cpt_table = cfs_cpt_table;
1198 the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_table);
1199
1200 LASSERT(the_lnet.ln_cpt_number > 0);
1201 if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1202 /* we are under risk of consuming all lh_cookie */
1203 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
1204 "please change setting of CPT-table and retry\n",
1205 the_lnet.ln_cpt_number, LNET_CPT_MAX);
1206 return -1;
1207 }
1208
1209 while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1210 the_lnet.ln_cpt_bits++;
1211
1212 rc = lnet_create_locks();
1213 if (rc != 0) {
1214 CERROR("Can't create LNet global locks: %d\n", rc);
1215 return -1;
1216 }
1217
1218 the_lnet.ln_refcount = 0;
1219 the_lnet.ln_init = 1;
1220 LNetInvalidateHandle(&the_lnet.ln_rc_eqh);
1221 INIT_LIST_HEAD(&the_lnet.ln_lnds);
1222 INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1223 INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1224
1225 /* The hash table size is the number of bits it takes to express the set
1226 * ln_num_routes, minus 1 (better to under estimate than over so we
1227 * don't waste memory). */
1228 if (rnet_htable_size <= 0)
1229 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1230 else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1231 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1232 the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1233 order_base_2(rnet_htable_size) - 1);
1234
1235 /* All LNDs apart from the LOLND are in separate modules. They
1236 * register themselves when their module loads, and unregister
1237 * themselves when their module is unloaded. */
1238 lnet_register_lnd(&the_lolnd);
1239 return 0;
1240}
1241EXPORT_SYMBOL(LNetInit);
1242
1243/**
1244 * Finalize LNet library.
1245 *
1246 * Only userspace program needs to call this function. It can be called
1247 * at most once.
1248 *
1249 * \pre LNetInit() called with success.
1250 * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1251 */
1252void
1253LNetFini(void)
1254{
1255 LASSERT(the_lnet.ln_init);
1256 LASSERT(the_lnet.ln_refcount == 0);
1257
1258 while (!list_empty(&the_lnet.ln_lnds))
1259 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1260 lnd_t, lnd_list));
1261 lnet_destroy_locks();
1262
1263 the_lnet.ln_init = 0;
1264}
1265EXPORT_SYMBOL(LNetFini);
1266
1267/**
1268 * Set LNet PID and start LNet interfaces, routing, and forwarding.
1269 *
1270 * Userspace program should call this after a successful call to LNetInit().
1271 * Users must call this function at least once before any other functions.
1272 * For each successful call there must be a corresponding call to
1273 * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1274 * ignored.
1275 *
1276 * The PID used by LNet may be different from the one requested.
1277 * See LNetGetId().
1278 *
1279 * \param requested_pid PID requested by the caller.
1280 *
1281 * \return >= 0 on success, and < 0 error code on failures.
1282 */
1283int
1284LNetNIInit(lnet_pid_t requested_pid)
1285{
1286 int im_a_router = 0;
1287 int rc;
1288
1289 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1290
1291 LASSERT (the_lnet.ln_init);
1292 CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1293
1294 if (the_lnet.ln_refcount > 0) {
1295 rc = the_lnet.ln_refcount++;
1296 goto out;
1297 }
1298
1299 lnet_get_tunables();
1300
1301 if (requested_pid == LNET_PID_ANY) {
1302 /* Don't instantiate LNET just for me */
1303 rc = -ENETDOWN;
1304 goto failed0;
1305 }
1306
1307 rc = lnet_prepare(requested_pid);
1308 if (rc != 0)
1309 goto failed0;
1310
1311 rc = lnet_startup_lndnis();
1312 if (rc != 0)
1313 goto failed1;
1314
1315 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1316 if (rc != 0)
1317 goto failed2;
1318
1319 rc = lnet_check_routes();
1320 if (rc != 0)
1321 goto failed2;
1322
1323 rc = lnet_rtrpools_alloc(im_a_router);
1324 if (rc != 0)
1325 goto failed2;
1326
1327 rc = lnet_acceptor_start();
1328 if (rc != 0)
1329 goto failed2;
1330
1331 the_lnet.ln_refcount = 1;
1332 /* Now I may use my own API functions... */
1333
1334 /* NB router checker needs the_lnet.ln_ping_info in
1335 * lnet_router_checker -> lnet_update_ni_status_locked */
1336 rc = lnet_ping_target_init();
1337 if (rc != 0)
1338 goto failed3;
1339
1340 rc = lnet_router_checker_start();
1341 if (rc != 0)
1342 goto failed4;
1343
1344 lnet_proc_init();
1345 goto out;
1346
1347 failed4:
1348 lnet_ping_target_fini();
1349 failed3:
1350 the_lnet.ln_refcount = 0;
1351 lnet_acceptor_stop();
1352 failed2:
1353 lnet_destroy_routes();
1354 lnet_shutdown_lndnis();
1355 failed1:
1356 lnet_unprepare();
1357 failed0:
1358 LASSERT (rc < 0);
1359 out:
1360 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1361 return rc;
1362}
1363EXPORT_SYMBOL(LNetNIInit);
1364
1365/**
1366 * Stop LNet interfaces, routing, and forwarding.
1367 *
1368 * Users must call this function once for each successful call to LNetNIInit().
1369 * Once the LNetNIFini() operation has been started, the results of pending
1370 * API operations are undefined.
1371 *
1372 * \return always 0 for current implementation.
1373 */
1374int
7d46a21a 1375LNetNIFini(void)
d7e09d03
PT		 1376{
1377 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1378
1379 LASSERT (the_lnet.ln_init);
1380 LASSERT (the_lnet.ln_refcount > 0);
1381
1382 if (the_lnet.ln_refcount != 1) {
1383 the_lnet.ln_refcount--;
1384 } else {
1385 LASSERT (!the_lnet.ln_niinit_self);
1386
1387 lnet_proc_fini();
1388 lnet_router_checker_stop();
1389 lnet_ping_target_fini();
1390
1391 /* Teardown fns that use my own API functions BEFORE here */
1392 the_lnet.ln_refcount = 0;
1393
1394 lnet_acceptor_stop();
1395 lnet_destroy_routes();
1396 lnet_shutdown_lndnis();
1397 lnet_unprepare();
1398 }
1399
1400 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1401 return 0;
1402}
1403EXPORT_SYMBOL(LNetNIFini);
1404
1405/**
1406 * This is an ugly hack to export IOC_LIBCFS_DEBUG_PEER and
1407 * IOC_LIBCFS_PORTALS_COMPATIBILITY commands to users, by tweaking the LNet
1408 * internal ioctl handler.
1409 *
1410 * IOC_LIBCFS_PORTALS_COMPATIBILITY is now deprecated, don't use it.
1411 *
1412 * \param cmd IOC_LIBCFS_DEBUG_PEER to print debugging data about a peer.
1413 * The data will be printed to system console. Don't use it excessively.
1414 * \param arg A pointer to lnet_process_id_t, process ID of the peer.
1415 *
1416 * \return Always return 0 when called by users directly (i.e., not via ioctl).
1417 */
1418int
1419LNetCtl(unsigned int cmd, void *arg)
1420{
1421 struct libcfs_ioctl_data *data = arg;
1422 lnet_process_id_t id = {0};
1423 lnet_ni_t *ni;
1424 int rc;
1425
1426 LASSERT (the_lnet.ln_init);
1427 LASSERT (the_lnet.ln_refcount > 0);
1428
1429 switch (cmd) {
1430 case IOC_LIBCFS_GET_NI:
1431 rc = LNetGetId(data->ioc_count, &id);
1432 data->ioc_nid = id.nid;
1433 return rc;
1434
1435 case IOC_LIBCFS_FAIL_NID:
1436 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1437
1438 case IOC_LIBCFS_ADD_ROUTE:
1439 rc = lnet_add_route(data->ioc_net, data->ioc_count,
e75fb87f 1440 data->ioc_nid, data->ioc_priority);
d7e09d03
PT		 1441 return (rc != 0) ? rc : lnet_check_routes();
1442
1443 case IOC_LIBCFS_DEL_ROUTE:
1444 return lnet_del_route(data->ioc_net, data->ioc_nid);
1445
1446 case IOC_LIBCFS_GET_ROUTE:
1447 return lnet_get_route(data->ioc_count,
1448 &data->ioc_net, &data->ioc_count,
e75fb87f
DO		 1449 &data->ioc_nid, &data->ioc_flags,
1450 &data->ioc_priority);
d7e09d03
PT		 1451 case IOC_LIBCFS_NOTIFY_ROUTER:
1452 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
1453 cfs_time_current() -
1454 cfs_time_seconds(cfs_time_current_sec() -
1455 (time_t)data->ioc_u64[0]));
1456
1457 case IOC_LIBCFS_PORTALS_COMPATIBILITY:
1458 /* This can be removed once lustre stops calling it */
1459 return 0;
1460
1461 case IOC_LIBCFS_LNET_DIST:
1462 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
1463 if (rc < 0 && rc != -EHOSTUNREACH)
1464 return rc;
1465
1466 data->ioc_u32[0] = rc;
1467 return 0;
1468
1469 case IOC_LIBCFS_TESTPROTOCOMPAT:
1470 lnet_net_lock(LNET_LOCK_EX);
1471 the_lnet.ln_testprotocompat = data->ioc_flags;
1472 lnet_net_unlock(LNET_LOCK_EX);
1473 return 0;
1474
1475 case IOC_LIBCFS_PING:
1476 id.nid = data->ioc_nid;
1477 id.pid = data->ioc_u32[0];
1478 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
1479 (lnet_process_id_t *)data->ioc_pbuf1,
1480 data->ioc_plen1/sizeof(lnet_process_id_t));
1481 if (rc < 0)
1482 return rc;
1483 data->ioc_count = rc;
1484 return 0;
1485
1486 case IOC_LIBCFS_DEBUG_PEER: {
1487 /* CAVEAT EMPTOR: this one designed for calling directly; not
1488 * via an ioctl */
1489 id = *((lnet_process_id_t *) arg);
1490
1491 lnet_debug_peer(id.nid);
1492
1493 ni = lnet_net2ni(LNET_NIDNET(id.nid));
1494 if (ni == NULL) {
1495 CDEBUG(D_WARNING, "No NI for %s\n", libcfs_id2str(id));
1496 } else {
1497 if (ni->ni_lnd->lnd_ctl == NULL) {
1498 CDEBUG(D_WARNING, "No ctl for %s\n",
1499 libcfs_id2str(id));
1500 } else {
1501 (void)ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1502 }
1503
1504 lnet_ni_decref(ni);
1505 }
1506 return 0;
1507 }
1508
1509 default:
1510 ni = lnet_net2ni(data->ioc_net);
1511 if (ni == NULL)
1512 return -EINVAL;
1513
1514 if (ni->ni_lnd->lnd_ctl == NULL)
1515 rc = -EINVAL;
1516 else
1517 rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1518
1519 lnet_ni_decref(ni);
1520 return rc;
1521 }
1522 /* not reached */
1523}
1524EXPORT_SYMBOL(LNetCtl);
1525
1526/**
1527 * Retrieve the lnet_process_id_t ID of LNet interface at \a index. Note that
1528 * all interfaces share a same PID, as requested by LNetNIInit().
1529 *
1530 * \param index Index of the interface to look up.
1531 * \param id On successful return, this location will hold the
1532 * lnet_process_id_t ID of the interface.
1533 *
1534 * \retval 0 If an interface exists at \a index.
1535 * \retval -ENOENT If no interface has been found.
1536 */
1537int
1538LNetGetId(unsigned int index, lnet_process_id_t *id)
1539{
1540 struct lnet_ni *ni;
1541 struct list_head *tmp;
1542 int cpt;
1543 int rc = -ENOENT;
1544
1545 LASSERT(the_lnet.ln_init);
4b1e84ed
PT		 1546
1547 /* LNetNI initilization failed? */
1548 if (the_lnet.ln_refcount == 0)
1549 return rc;
d7e09d03
PT		 1550
1551 cpt = lnet_net_lock_current();
1552
1553 list_for_each(tmp, &the_lnet.ln_nis) {
1554 if (index-- != 0)
1555 continue;
1556
1557 ni = list_entry(tmp, lnet_ni_t, ni_list);
1558
1559 id->nid = ni->ni_nid;
1560 id->pid = the_lnet.ln_pid;
1561 rc = 0;
1562 break;
1563 }
1564
1565 lnet_net_unlock(cpt);
1566 return rc;
1567}
1568EXPORT_SYMBOL(LNetGetId);
1569
1570/**
1571 * Print a string representation of handle \a h into buffer \a str of
1572 * \a len bytes.
1573 */
1574void
1575LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
1576{
1577 snprintf(str, len, LPX64, h.cookie);
1578}
1579EXPORT_SYMBOL(LNetSnprintHandle);
1580
1581static int
1582lnet_create_ping_info(void)
1583{
1584 int i;
1585 int n;
1586 int rc;
1587 unsigned int infosz;
1588 lnet_ni_t *ni;
1589 lnet_process_id_t id;
1590 lnet_ping_info_t *pinfo;
1591
1592 for (n = 0; ; n++) {
1593 rc = LNetGetId(n, &id);
1594 if (rc == -ENOENT)
1595 break;
1596
1597 LASSERT (rc == 0);
1598 }
1599
1600 infosz = offsetof(lnet_ping_info_t, pi_ni[n]);
1601 LIBCFS_ALLOC(pinfo, infosz);
1602 if (pinfo == NULL) {
1603 CERROR("Can't allocate ping info[%d]\n", n);
1604 return -ENOMEM;
1605 }
1606
1607 pinfo->pi_nnis = n;
1608 pinfo->pi_pid = the_lnet.ln_pid;
1609 pinfo->pi_magic = LNET_PROTO_PING_MAGIC;
1610 pinfo->pi_features = LNET_PING_FEAT_NI_STATUS;
1611
1612 for (i = 0; i < n; i++) {
1613 lnet_ni_status_t *ns = &pinfo->pi_ni[i];
1614
1615 rc = LNetGetId(i, &id);
1616 LASSERT (rc == 0);
1617
1618 ns->ns_nid = id.nid;
1619 ns->ns_status = LNET_NI_STATUS_UP;
1620
1621 lnet_net_lock(0);
1622
1623 ni = lnet_nid2ni_locked(id.nid, 0);
1624 LASSERT(ni != NULL);
1625
1626 lnet_ni_lock(ni);
1627 LASSERT(ni->ni_status == NULL);
1628 ni->ni_status = ns;
1629 lnet_ni_unlock(ni);
1630
1631 lnet_ni_decref_locked(ni, 0);
1632 lnet_net_unlock(0);
1633 }
1634
1635 the_lnet.ln_ping_info = pinfo;
1636 return 0;
1637}
1638
1639static void
1640lnet_destroy_ping_info(void)
1641{
1642 struct lnet_ni *ni;
1643
1644 lnet_net_lock(0);
1645
1646 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
1647 lnet_ni_lock(ni);
1648 ni->ni_status = NULL;
1649 lnet_ni_unlock(ni);
1650 }
1651
1652 lnet_net_unlock(0);
1653
1654 LIBCFS_FREE(the_lnet.ln_ping_info,
1655 offsetof(lnet_ping_info_t,
1656 pi_ni[the_lnet.ln_ping_info->pi_nnis]));
1657 the_lnet.ln_ping_info = NULL;
1658 return;
1659}
1660
1661int
1662lnet_ping_target_init(void)
1663{
1664 lnet_md_t md = {0};
1665 lnet_handle_me_t meh;
1666 lnet_process_id_t id;
1667 int rc;
1668 int rc2;
1669 int infosz;
1670
1671 rc = lnet_create_ping_info();
1672 if (rc != 0)
1673 return rc;
1674
1675 /* We can have a tiny EQ since we only need to see the unlink event on
1676 * teardown, which by definition is the last one! */
1677 rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &the_lnet.ln_ping_target_eq);
1678 if (rc != 0) {
1679 CERROR("Can't allocate ping EQ: %d\n", rc);
1680 goto failed_0;
1681 }
1682
1683 memset(&id, 0, sizeof(lnet_process_id_t));
1684 id.nid = LNET_NID_ANY;
1685 id.pid = LNET_PID_ANY;
1686
1687 rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1688 LNET_PROTO_PING_MATCHBITS, 0,
1689 LNET_UNLINK, LNET_INS_AFTER,
1690 &meh);
1691 if (rc != 0) {
1692 CERROR("Can't create ping ME: %d\n", rc);
1693 goto failed_1;
1694 }
1695
1696 /* initialize md content */
1697 infosz = offsetof(lnet_ping_info_t,
1698 pi_ni[the_lnet.ln_ping_info->pi_nnis]);
1699 md.start = the_lnet.ln_ping_info;
1700 md.length = infosz;
1701 md.threshold = LNET_MD_THRESH_INF;
1702 md.max_size = 0;
1703 md.options = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1704 LNET_MD_MANAGE_REMOTE;
1705 md.user_ptr = NULL;
1706 md.eq_handle = the_lnet.ln_ping_target_eq;
1707
1708 rc = LNetMDAttach(meh, md,
1709 LNET_RETAIN,
1710 &the_lnet.ln_ping_target_md);
1711 if (rc != 0) {
1712 CERROR("Can't attach ping MD: %d\n", rc);
1713 goto failed_2;
1714 }
1715
1716 return 0;
1717
1718 failed_2:
1719 rc2 = LNetMEUnlink(meh);
1720 LASSERT (rc2 == 0);
1721 failed_1:
1722 rc2 = LNetEQFree(the_lnet.ln_ping_target_eq);
1723 LASSERT (rc2 == 0);
1724 failed_0:
1725 lnet_destroy_ping_info();
1726 return rc;
1727}
1728
1729void
1730lnet_ping_target_fini(void)
1731{
1732 lnet_event_t event;
1733 int rc;
1734 int which;
1735 int timeout_ms = 1000;
1736 sigset_t blocked = cfs_block_allsigs();
1737
1738 LNetMDUnlink(the_lnet.ln_ping_target_md);
1739 /* NB md could be busy; this just starts the unlink */
1740
1741 for (;;) {
1742 rc = LNetEQPoll(&the_lnet.ln_ping_target_eq, 1,
1743 timeout_ms, &event, &which);
1744
1745 /* I expect overflow... */
1746 LASSERT (rc >= 0 || rc == -EOVERFLOW);
1747
1748 if (rc == 0) {
1749 /* timed out: provide a diagnostic */
1750 CWARN("Still waiting for ping MD to unlink\n");
1751 timeout_ms *= 2;
1752 continue;
1753 }
1754
1755 /* Got a valid event */
1756 if (event.unlinked)
1757 break;
1758 }
1759
1760 rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1761 LASSERT (rc == 0);
1762 lnet_destroy_ping_info();
1763 cfs_restore_sigs(blocked);
1764}
1765
1766int
1767lnet_ping (lnet_process_id_t id, int timeout_ms, lnet_process_id_t *ids, int n_ids)
1768{
1769 lnet_handle_eq_t eqh;
1770 lnet_handle_md_t mdh;
1771 lnet_event_t event;
1772 lnet_md_t md = {0};
1773 int which;
1774 int unlinked = 0;
1775 int replied = 0;
1776 const int a_long_time = 60000; /* mS */
1777 int infosz = offsetof(lnet_ping_info_t, pi_ni[n_ids]);
1778 lnet_ping_info_t *info;
1779 lnet_process_id_t tmpid;
1780 int i;
1781 int nob;
1782 int rc;
1783 int rc2;
1784 sigset_t blocked;
1785
1786 if (n_ids <= 0 ||
1787 id.nid == LNET_NID_ANY ||
1788 timeout_ms > 500000 || /* arbitrary limit! */
1789 n_ids > 20) /* arbitrary limit! */
1790 return -EINVAL;
1791
1792 if (id.pid == LNET_PID_ANY)
1793 id.pid = LUSTRE_SRV_LNET_PID;
1794
1795 LIBCFS_ALLOC(info, infosz);
1796 if (info == NULL)
1797 return -ENOMEM;
1798
1799 /* NB 2 events max (including any unlink event) */
1800 rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
1801 if (rc != 0) {
1802 CERROR("Can't allocate EQ: %d\n", rc);
1803 goto out_0;
1804 }
1805
1806 /* initialize md content */
1807 md.start = info;
1808 md.length = infosz;
1809 md.threshold = 2; /*GET/REPLY*/
1810 md.max_size = 0;
1811 md.options = LNET_MD_TRUNCATE;
1812 md.user_ptr = NULL;
1813 md.eq_handle = eqh;
1814
1815 rc = LNetMDBind(md, LNET_UNLINK, &mdh);
1816 if (rc != 0) {
1817 CERROR("Can't bind MD: %d\n", rc);
1818 goto out_1;
1819 }
1820
1821 rc = LNetGet(LNET_NID_ANY, mdh, id,
1822 LNET_RESERVED_PORTAL,
1823 LNET_PROTO_PING_MATCHBITS, 0);
1824
1825 if (rc != 0) {
1826 /* Don't CERROR; this could be deliberate! */
1827
1828 rc2 = LNetMDUnlink(mdh);
1829 LASSERT (rc2 == 0);
1830
1831 /* NB must wait for the UNLINK event below... */
1832 unlinked = 1;
1833 timeout_ms = a_long_time;
1834 }
1835
1836 do {
1837 /* MUST block for unlink to complete */
1838 if (unlinked)
1839 blocked = cfs_block_allsigs();
1840
1841 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
1842
1843 if (unlinked)
1844 cfs_restore_sigs(blocked);
1845
1846 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
1847 (rc2 <= 0) ? -1 : event.type,
1848 (rc2 <= 0) ? -1 : event.status,
1849 (rc2 > 0 && event.unlinked) ? " unlinked" : "");
1850
1851 LASSERT (rc2 != -EOVERFLOW); /* can't miss anything */
1852
1853 if (rc2 <= 0 || event.status != 0) {
1854 /* timeout or error */
1855 if (!replied && rc == 0)
1856 rc = (rc2 < 0) ? rc2 :
1857 (rc2 == 0) ? -ETIMEDOUT :
1858 event.status;
1859
1860 if (!unlinked) {
1861 /* Ensure completion in finite time... */
1862 LNetMDUnlink(mdh);
1863 /* No assertion (racing with network) */
1864 unlinked = 1;
1865 timeout_ms = a_long_time;
1866 } else if (rc2 == 0) {
1867 /* timed out waiting for unlink */
1868 CWARN("ping %s: late network completion\n",
1869 libcfs_id2str(id));
1870 }
1871 } else if (event.type == LNET_EVENT_REPLY) {
1872 replied = 1;
1873 rc = event.mlength;
1874 }
1875
1876 } while (rc2 <= 0 || !event.unlinked);
1877
1878 if (!replied) {
1879 if (rc >= 0)
1880 CWARN("%s: Unexpected rc >= 0 but no reply!\n",
1881 libcfs_id2str(id));
1882 rc = -EIO;
1883 goto out_1;
1884 }
1885
1886 nob = rc;
1887 LASSERT (nob >= 0 && nob <= infosz);
1888
1889 rc = -EPROTO; /* if I can't parse... */
1890
1891 if (nob < 8) {
1892 /* can't check magic/version */
1893 CERROR("%s: ping info too short %d\n",
1894 libcfs_id2str(id), nob);
1895 goto out_1;
1896 }
1897
1898 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
1899 lnet_swap_pinginfo(info);
1900 } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
1901 CERROR("%s: Unexpected magic %08x\n",
1902 libcfs_id2str(id), info->pi_magic);
1903 goto out_1;
1904 }
1905
1906 if ((info->pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
1907 CERROR("%s: ping w/o NI status: 0x%x\n",
1908 libcfs_id2str(id), info->pi_features);
1909 goto out_1;
1910 }
1911
1912 if (nob < offsetof(lnet_ping_info_t, pi_ni[0])) {
1913 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
1914 nob, (int)offsetof(lnet_ping_info_t, pi_ni[0]));
1915 goto out_1;
1916 }
1917
1918 if (info->pi_nnis < n_ids)
1919 n_ids = info->pi_nnis;
1920
1921 if (nob < offsetof(lnet_ping_info_t, pi_ni[n_ids])) {
1922 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
1923 nob, (int)offsetof(lnet_ping_info_t, pi_ni[n_ids]));
1924 goto out_1;
1925 }
1926
1927 rc = -EFAULT; /* If I SEGV... */
1928
1929 for (i = 0; i < n_ids; i++) {
1930 tmpid.pid = info->pi_pid;
1931 tmpid.nid = info->pi_ni[i].ns_nid;
1932 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
1933 goto out_1;
1934 }
1935 rc = info->pi_nnis;
1936
1937 out_1:
1938 rc2 = LNetEQFree(eqh);
1939 if (rc2 != 0)
1940 CERROR("rc2 %d\n", rc2);
1941 LASSERT (rc2 == 0);
1942
1943 out_0:
1944 LIBCFS_FREE(info, infosz);
1945 return rc;
1946}
Linux kernel - Deliverables
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