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