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[deliverable/linux.git] / drivers / staging / lustre / lnet / lnet / api-ni.c
1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2015, 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 #include "../../include/linux/lnet/lib-dlc.h"
43
44 #define D_LNI D_CONSOLE
45
46 lnet_t the_lnet; /* THE state of the network */
47 EXPORT_SYMBOL(the_lnet);
48
49 static char *ip2nets = "";
50 module_param(ip2nets, charp, 0444);
51 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
52
53 static char *networks = "";
54 module_param(networks, charp, 0444);
55 MODULE_PARM_DESC(networks, "local networks");
56
57 static char *routes = "";
58 module_param(routes, charp, 0444);
59 MODULE_PARM_DESC(routes, "routes to non-local networks");
60
61 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
62 module_param(rnet_htable_size, int, 0444);
63 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
64
65 static int lnet_ping(lnet_process_id_t id, int timeout_ms,
66 lnet_process_id_t __user *ids, int n_ids);
67
68 static char *
69 lnet_get_routes(void)
70 {
71 return routes;
72 }
73
74 static char *
75 lnet_get_networks(void)
76 {
77 char *nets;
78 int rc;
79
80 if (*networks && *ip2nets) {
81 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or 'ip2nets' but not both at once\n");
82 return NULL;
83 }
84
85 if (*ip2nets) {
86 rc = lnet_parse_ip2nets(&nets, ip2nets);
87 return !rc ? nets : NULL;
88 }
89
90 if (*networks)
91 return networks;
92
93 return "tcp";
94 }
95
96 static void
97 lnet_init_locks(void)
98 {
99 spin_lock_init(&the_lnet.ln_eq_wait_lock);
100 init_waitqueue_head(&the_lnet.ln_eq_waitq);
101 mutex_init(&the_lnet.ln_lnd_mutex);
102 mutex_init(&the_lnet.ln_api_mutex);
103 }
104
105 static int
106 lnet_create_remote_nets_table(void)
107 {
108 int i;
109 struct list_head *hash;
110
111 LASSERT(!the_lnet.ln_remote_nets_hash);
112 LASSERT(the_lnet.ln_remote_nets_hbits > 0);
113 LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
114 if (!hash) {
115 CERROR("Failed to create remote nets hash table\n");
116 return -ENOMEM;
117 }
118
119 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
120 INIT_LIST_HEAD(&hash[i]);
121 the_lnet.ln_remote_nets_hash = hash;
122 return 0;
123 }
124
125 static void
126 lnet_destroy_remote_nets_table(void)
127 {
128 int i;
129
130 if (!the_lnet.ln_remote_nets_hash)
131 return;
132
133 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
134 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
135
136 LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
137 LNET_REMOTE_NETS_HASH_SIZE *
138 sizeof(the_lnet.ln_remote_nets_hash[0]));
139 the_lnet.ln_remote_nets_hash = NULL;
140 }
141
142 static void
143 lnet_destroy_locks(void)
144 {
145 if (the_lnet.ln_res_lock) {
146 cfs_percpt_lock_free(the_lnet.ln_res_lock);
147 the_lnet.ln_res_lock = NULL;
148 }
149
150 if (the_lnet.ln_net_lock) {
151 cfs_percpt_lock_free(the_lnet.ln_net_lock);
152 the_lnet.ln_net_lock = NULL;
153 }
154 }
155
156 static int
157 lnet_create_locks(void)
158 {
159 lnet_init_locks();
160
161 the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
162 if (!the_lnet.ln_res_lock)
163 goto failed;
164
165 the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
166 if (!the_lnet.ln_net_lock)
167 goto failed;
168
169 return 0;
170
171 failed:
172 lnet_destroy_locks();
173 return -ENOMEM;
174 }
175
176 static void lnet_assert_wire_constants(void)
177 {
178 /*
179 * Wire protocol assertions generated by 'wirecheck'
180 * running on Linux robert.bartonsoftware.com 2.6.8-1.521
181 * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
182 * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7)
183 */
184
185 /* Constants... */
186 CLASSERT(LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
187 CLASSERT(LNET_PROTO_TCP_VERSION_MAJOR == 1);
188 CLASSERT(LNET_PROTO_TCP_VERSION_MINOR == 0);
189 CLASSERT(LNET_MSG_ACK == 0);
190 CLASSERT(LNET_MSG_PUT == 1);
191 CLASSERT(LNET_MSG_GET == 2);
192 CLASSERT(LNET_MSG_REPLY == 3);
193 CLASSERT(LNET_MSG_HELLO == 4);
194
195 /* Checks for struct ptl_handle_wire_t */
196 CLASSERT((int)sizeof(lnet_handle_wire_t) == 16);
197 CLASSERT((int)offsetof(lnet_handle_wire_t, wh_interface_cookie) == 0);
198 CLASSERT((int)sizeof(((lnet_handle_wire_t *)0)->wh_interface_cookie) == 8);
199 CLASSERT((int)offsetof(lnet_handle_wire_t, wh_object_cookie) == 8);
200 CLASSERT((int)sizeof(((lnet_handle_wire_t *)0)->wh_object_cookie) == 8);
201
202 /* Checks for struct lnet_magicversion_t */
203 CLASSERT((int)sizeof(lnet_magicversion_t) == 8);
204 CLASSERT((int)offsetof(lnet_magicversion_t, magic) == 0);
205 CLASSERT((int)sizeof(((lnet_magicversion_t *)0)->magic) == 4);
206 CLASSERT((int)offsetof(lnet_magicversion_t, version_major) == 4);
207 CLASSERT((int)sizeof(((lnet_magicversion_t *)0)->version_major) == 2);
208 CLASSERT((int)offsetof(lnet_magicversion_t, version_minor) == 6);
209 CLASSERT((int)sizeof(((lnet_magicversion_t *)0)->version_minor) == 2);
210
211 /* Checks for struct lnet_hdr_t */
212 CLASSERT((int)sizeof(lnet_hdr_t) == 72);
213 CLASSERT((int)offsetof(lnet_hdr_t, dest_nid) == 0);
214 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->dest_nid) == 8);
215 CLASSERT((int)offsetof(lnet_hdr_t, src_nid) == 8);
216 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->src_nid) == 8);
217 CLASSERT((int)offsetof(lnet_hdr_t, dest_pid) == 16);
218 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->dest_pid) == 4);
219 CLASSERT((int)offsetof(lnet_hdr_t, src_pid) == 20);
220 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->src_pid) == 4);
221 CLASSERT((int)offsetof(lnet_hdr_t, type) == 24);
222 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->type) == 4);
223 CLASSERT((int)offsetof(lnet_hdr_t, payload_length) == 28);
224 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->payload_length) == 4);
225 CLASSERT((int)offsetof(lnet_hdr_t, msg) == 32);
226 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg) == 40);
227
228 /* Ack */
229 CLASSERT((int)offsetof(lnet_hdr_t, msg.ack.dst_wmd) == 32);
230 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.ack.dst_wmd) == 16);
231 CLASSERT((int)offsetof(lnet_hdr_t, msg.ack.match_bits) == 48);
232 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.ack.match_bits) == 8);
233 CLASSERT((int)offsetof(lnet_hdr_t, msg.ack.mlength) == 56);
234 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.ack.mlength) == 4);
235
236 /* Put */
237 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.ack_wmd) == 32);
238 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.ack_wmd) == 16);
239 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.match_bits) == 48);
240 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.match_bits) == 8);
241 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.hdr_data) == 56);
242 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.hdr_data) == 8);
243 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.ptl_index) == 64);
244 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.ptl_index) == 4);
245 CLASSERT((int)offsetof(lnet_hdr_t, msg.put.offset) == 68);
246 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.put.offset) == 4);
247
248 /* Get */
249 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.return_wmd) == 32);
250 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.return_wmd) == 16);
251 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.match_bits) == 48);
252 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.match_bits) == 8);
253 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.ptl_index) == 56);
254 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.ptl_index) == 4);
255 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.src_offset) == 60);
256 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.src_offset) == 4);
257 CLASSERT((int)offsetof(lnet_hdr_t, msg.get.sink_length) == 64);
258 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.get.sink_length) == 4);
259
260 /* Reply */
261 CLASSERT((int)offsetof(lnet_hdr_t, msg.reply.dst_wmd) == 32);
262 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.reply.dst_wmd) == 16);
263
264 /* Hello */
265 CLASSERT((int)offsetof(lnet_hdr_t, msg.hello.incarnation) == 32);
266 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.hello.incarnation) == 8);
267 CLASSERT((int)offsetof(lnet_hdr_t, msg.hello.type) == 40);
268 CLASSERT((int)sizeof(((lnet_hdr_t *)0)->msg.hello.type) == 4);
269 }
270
271 static lnd_t *
272 lnet_find_lnd_by_type(__u32 type)
273 {
274 lnd_t *lnd;
275 struct list_head *tmp;
276
277 /* holding lnd mutex */
278 list_for_each(tmp, &the_lnet.ln_lnds) {
279 lnd = list_entry(tmp, lnd_t, lnd_list);
280
281 if (lnd->lnd_type == type)
282 return lnd;
283 }
284
285 return NULL;
286 }
287
288 void
289 lnet_register_lnd(lnd_t *lnd)
290 {
291 mutex_lock(&the_lnet.ln_lnd_mutex);
292
293 LASSERT(the_lnet.ln_init);
294 LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
295 LASSERT(!lnet_find_lnd_by_type(lnd->lnd_type));
296
297 list_add_tail(&lnd->lnd_list, &the_lnet.ln_lnds);
298 lnd->lnd_refcount = 0;
299
300 CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
301
302 mutex_unlock(&the_lnet.ln_lnd_mutex);
303 }
304 EXPORT_SYMBOL(lnet_register_lnd);
305
306 void
307 lnet_unregister_lnd(lnd_t *lnd)
308 {
309 mutex_lock(&the_lnet.ln_lnd_mutex);
310
311 LASSERT(the_lnet.ln_init);
312 LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
313 LASSERT(!lnd->lnd_refcount);
314
315 list_del(&lnd->lnd_list);
316 CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
317
318 mutex_unlock(&the_lnet.ln_lnd_mutex);
319 }
320 EXPORT_SYMBOL(lnet_unregister_lnd);
321
322 void
323 lnet_counters_get(lnet_counters_t *counters)
324 {
325 lnet_counters_t *ctr;
326 int i;
327
328 memset(counters, 0, sizeof(*counters));
329
330 lnet_net_lock(LNET_LOCK_EX);
331
332 cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
333 counters->msgs_max += ctr->msgs_max;
334 counters->msgs_alloc += ctr->msgs_alloc;
335 counters->errors += ctr->errors;
336 counters->send_count += ctr->send_count;
337 counters->recv_count += ctr->recv_count;
338 counters->route_count += ctr->route_count;
339 counters->drop_count += ctr->drop_count;
340 counters->send_length += ctr->send_length;
341 counters->recv_length += ctr->recv_length;
342 counters->route_length += ctr->route_length;
343 counters->drop_length += ctr->drop_length;
344 }
345 lnet_net_unlock(LNET_LOCK_EX);
346 }
347 EXPORT_SYMBOL(lnet_counters_get);
348
349 void
350 lnet_counters_reset(void)
351 {
352 lnet_counters_t *counters;
353 int i;
354
355 lnet_net_lock(LNET_LOCK_EX);
356
357 cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
358 memset(counters, 0, sizeof(lnet_counters_t));
359
360 lnet_net_unlock(LNET_LOCK_EX);
361 }
362
363 static char *
364 lnet_res_type2str(int type)
365 {
366 switch (type) {
367 default:
368 LBUG();
369 case LNET_COOKIE_TYPE_MD:
370 return "MD";
371 case LNET_COOKIE_TYPE_ME:
372 return "ME";
373 case LNET_COOKIE_TYPE_EQ:
374 return "EQ";
375 }
376 }
377
378 static void
379 lnet_res_container_cleanup(struct lnet_res_container *rec)
380 {
381 int count = 0;
382
383 if (!rec->rec_type) /* not set yet, it's uninitialized */
384 return;
385
386 while (!list_empty(&rec->rec_active)) {
387 struct list_head *e = rec->rec_active.next;
388
389 list_del_init(e);
390 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
391 lnet_eq_free(list_entry(e, lnet_eq_t, eq_list));
392
393 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
394 lnet_md_free(list_entry(e, lnet_libmd_t, md_list));
395
396 } else { /* NB: Active MEs should be attached on portals */
397 LBUG();
398 }
399 count++;
400 }
401
402 if (count > 0) {
403 /*
404 * Found alive MD/ME/EQ, user really should unlink/free
405 * all of them before finalize LNet, but if someone didn't,
406 * we have to recycle garbage for him
407 */
408 CERROR("%d active elements on exit of %s container\n",
409 count, lnet_res_type2str(rec->rec_type));
410 }
411
412 if (rec->rec_lh_hash) {
413 LIBCFS_FREE(rec->rec_lh_hash,
414 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
415 rec->rec_lh_hash = NULL;
416 }
417
418 rec->rec_type = 0; /* mark it as finalized */
419 }
420
421 static int
422 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
423 {
424 int rc = 0;
425 int i;
426
427 LASSERT(!rec->rec_type);
428
429 rec->rec_type = type;
430 INIT_LIST_HEAD(&rec->rec_active);
431 rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
432
433 /* Arbitrary choice of hash table size */
434 LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
435 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
436 if (!rec->rec_lh_hash) {
437 rc = -ENOMEM;
438 goto out;
439 }
440
441 for (i = 0; i < LNET_LH_HASH_SIZE; i++)
442 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
443
444 return 0;
445
446 out:
447 CERROR("Failed to setup %s resource container\n",
448 lnet_res_type2str(type));
449 lnet_res_container_cleanup(rec);
450 return rc;
451 }
452
453 static void
454 lnet_res_containers_destroy(struct lnet_res_container **recs)
455 {
456 struct lnet_res_container *rec;
457 int i;
458
459 cfs_percpt_for_each(rec, i, recs)
460 lnet_res_container_cleanup(rec);
461
462 cfs_percpt_free(recs);
463 }
464
465 static struct lnet_res_container **
466 lnet_res_containers_create(int type)
467 {
468 struct lnet_res_container **recs;
469 struct lnet_res_container *rec;
470 int rc;
471 int i;
472
473 recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
474 if (!recs) {
475 CERROR("Failed to allocate %s resource containers\n",
476 lnet_res_type2str(type));
477 return NULL;
478 }
479
480 cfs_percpt_for_each(rec, i, recs) {
481 rc = lnet_res_container_setup(rec, i, type);
482 if (rc) {
483 lnet_res_containers_destroy(recs);
484 return NULL;
485 }
486 }
487
488 return recs;
489 }
490
491 lnet_libhandle_t *
492 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
493 {
494 /* ALWAYS called with lnet_res_lock held */
495 struct list_head *head;
496 lnet_libhandle_t *lh;
497 unsigned int hash;
498
499 if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
500 return NULL;
501
502 hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
503 head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
504
505 list_for_each_entry(lh, head, lh_hash_chain) {
506 if (lh->lh_cookie == cookie)
507 return lh;
508 }
509
510 return NULL;
511 }
512
513 void
514 lnet_res_lh_initialize(struct lnet_res_container *rec, lnet_libhandle_t *lh)
515 {
516 /* ALWAYS called with lnet_res_lock held */
517 unsigned int ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
518 unsigned int hash;
519
520 lh->lh_cookie = rec->rec_lh_cookie;
521 rec->rec_lh_cookie += 1 << ibits;
522
523 hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
524
525 list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
526 }
527
528 static int lnet_unprepare(void);
529
530 static int
531 lnet_prepare(lnet_pid_t requested_pid)
532 {
533 /* Prepare to bring up the network */
534 struct lnet_res_container **recs;
535 int rc = 0;
536
537 if (requested_pid == LNET_PID_ANY) {
538 /* Don't instantiate LNET just for me */
539 return -ENETDOWN;
540 }
541
542 LASSERT(!the_lnet.ln_refcount);
543
544 the_lnet.ln_routing = 0;
545
546 LASSERT(!(requested_pid & LNET_PID_USERFLAG));
547 the_lnet.ln_pid = requested_pid;
548
549 INIT_LIST_HEAD(&the_lnet.ln_test_peers);
550 INIT_LIST_HEAD(&the_lnet.ln_nis);
551 INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
552 INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
553 INIT_LIST_HEAD(&the_lnet.ln_routers);
554
555 rc = lnet_create_remote_nets_table();
556 if (rc)
557 goto failed;
558 /*
559 * NB the interface cookie in wire handles guards against delayed
560 * replies and ACKs appearing valid after reboot.
561 */
562 the_lnet.ln_interface_cookie = ktime_get_ns();
563
564 the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
565 sizeof(lnet_counters_t));
566 if (!the_lnet.ln_counters) {
567 CERROR("Failed to allocate counters for LNet\n");
568 rc = -ENOMEM;
569 goto failed;
570 }
571
572 rc = lnet_peer_tables_create();
573 if (rc)
574 goto failed;
575
576 rc = lnet_msg_containers_create();
577 if (rc)
578 goto failed;
579
580 rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
581 LNET_COOKIE_TYPE_EQ);
582 if (rc)
583 goto failed;
584
585 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME);
586 if (!recs) {
587 rc = -ENOMEM;
588 goto failed;
589 }
590
591 the_lnet.ln_me_containers = recs;
592
593 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
594 if (!recs) {
595 rc = -ENOMEM;
596 goto failed;
597 }
598
599 the_lnet.ln_md_containers = recs;
600
601 rc = lnet_portals_create();
602 if (rc) {
603 CERROR("Failed to create portals for LNet: %d\n", rc);
604 goto failed;
605 }
606
607 return 0;
608
609 failed:
610 lnet_unprepare();
611 return rc;
612 }
613
614 static int
615 lnet_unprepare(void)
616 {
617 /*
618 * NB no LNET_LOCK since this is the last reference. All LND instances
619 * have shut down already, so it is safe to unlink and free all
620 * descriptors, even those that appear committed to a network op (eg MD
621 * with non-zero pending count)
622 */
623 lnet_fail_nid(LNET_NID_ANY, 0);
624
625 LASSERT(!the_lnet.ln_refcount);
626 LASSERT(list_empty(&the_lnet.ln_test_peers));
627 LASSERT(list_empty(&the_lnet.ln_nis));
628 LASSERT(list_empty(&the_lnet.ln_nis_cpt));
629 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
630
631 lnet_portals_destroy();
632
633 if (the_lnet.ln_md_containers) {
634 lnet_res_containers_destroy(the_lnet.ln_md_containers);
635 the_lnet.ln_md_containers = NULL;
636 }
637
638 if (the_lnet.ln_me_containers) {
639 lnet_res_containers_destroy(the_lnet.ln_me_containers);
640 the_lnet.ln_me_containers = NULL;
641 }
642
643 lnet_res_container_cleanup(&the_lnet.ln_eq_container);
644
645 lnet_msg_containers_destroy();
646 lnet_peer_tables_destroy();
647 lnet_rtrpools_free(0);
648
649 if (the_lnet.ln_counters) {
650 cfs_percpt_free(the_lnet.ln_counters);
651 the_lnet.ln_counters = NULL;
652 }
653 lnet_destroy_remote_nets_table();
654
655 return 0;
656 }
657
658 lnet_ni_t *
659 lnet_net2ni_locked(__u32 net, int cpt)
660 {
661 struct list_head *tmp;
662 lnet_ni_t *ni;
663
664 LASSERT(cpt != LNET_LOCK_EX);
665
666 list_for_each(tmp, &the_lnet.ln_nis) {
667 ni = list_entry(tmp, lnet_ni_t, ni_list);
668
669 if (LNET_NIDNET(ni->ni_nid) == net) {
670 lnet_ni_addref_locked(ni, cpt);
671 return ni;
672 }
673 }
674
675 return NULL;
676 }
677
678 lnet_ni_t *
679 lnet_net2ni(__u32 net)
680 {
681 lnet_ni_t *ni;
682
683 lnet_net_lock(0);
684 ni = lnet_net2ni_locked(net, 0);
685 lnet_net_unlock(0);
686
687 return ni;
688 }
689 EXPORT_SYMBOL(lnet_net2ni);
690
691 static unsigned int
692 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
693 {
694 __u64 key = nid;
695 unsigned int val;
696
697 LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
698
699 if (number == 1)
700 return 0;
701
702 val = hash_long(key, LNET_CPT_BITS);
703 /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
704 if (val < number)
705 return val;
706
707 return (unsigned int)(key + val + (val >> 1)) % number;
708 }
709
710 int
711 lnet_cpt_of_nid_locked(lnet_nid_t nid)
712 {
713 struct lnet_ni *ni;
714
715 /* must called with hold of lnet_net_lock */
716 if (LNET_CPT_NUMBER == 1)
717 return 0; /* the only one */
718
719 /* take lnet_net_lock(any) would be OK */
720 if (!list_empty(&the_lnet.ln_nis_cpt)) {
721 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
722 if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
723 continue;
724
725 LASSERT(ni->ni_cpts);
726 return ni->ni_cpts[lnet_nid_cpt_hash
727 (nid, ni->ni_ncpts)];
728 }
729 }
730
731 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
732 }
733
734 int
735 lnet_cpt_of_nid(lnet_nid_t nid)
736 {
737 int cpt;
738 int cpt2;
739
740 if (LNET_CPT_NUMBER == 1)
741 return 0; /* the only one */
742
743 if (list_empty(&the_lnet.ln_nis_cpt))
744 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
745
746 cpt = lnet_net_lock_current();
747 cpt2 = lnet_cpt_of_nid_locked(nid);
748 lnet_net_unlock(cpt);
749
750 return cpt2;
751 }
752 EXPORT_SYMBOL(lnet_cpt_of_nid);
753
754 int
755 lnet_islocalnet(__u32 net)
756 {
757 struct lnet_ni *ni;
758 int cpt;
759
760 cpt = lnet_net_lock_current();
761
762 ni = lnet_net2ni_locked(net, cpt);
763 if (ni)
764 lnet_ni_decref_locked(ni, cpt);
765
766 lnet_net_unlock(cpt);
767
768 return !!ni;
769 }
770
771 lnet_ni_t *
772 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
773 {
774 struct lnet_ni *ni;
775 struct list_head *tmp;
776
777 LASSERT(cpt != LNET_LOCK_EX);
778
779 list_for_each(tmp, &the_lnet.ln_nis) {
780 ni = list_entry(tmp, lnet_ni_t, ni_list);
781
782 if (ni->ni_nid == nid) {
783 lnet_ni_addref_locked(ni, cpt);
784 return ni;
785 }
786 }
787
788 return NULL;
789 }
790
791 int
792 lnet_islocalnid(lnet_nid_t nid)
793 {
794 struct lnet_ni *ni;
795 int cpt;
796
797 cpt = lnet_net_lock_current();
798 ni = lnet_nid2ni_locked(nid, cpt);
799 if (ni)
800 lnet_ni_decref_locked(ni, cpt);
801 lnet_net_unlock(cpt);
802
803 return !!ni;
804 }
805
806 int
807 lnet_count_acceptor_nis(void)
808 {
809 /* Return the # of NIs that need the acceptor. */
810 int count = 0;
811 struct list_head *tmp;
812 struct lnet_ni *ni;
813 int cpt;
814
815 cpt = lnet_net_lock_current();
816 list_for_each(tmp, &the_lnet.ln_nis) {
817 ni = list_entry(tmp, lnet_ni_t, ni_list);
818
819 if (ni->ni_lnd->lnd_accept)
820 count++;
821 }
822
823 lnet_net_unlock(cpt);
824
825 return count;
826 }
827
828 static lnet_ping_info_t *
829 lnet_ping_info_create(int num_ni)
830 {
831 lnet_ping_info_t *ping_info;
832 unsigned int infosz;
833
834 infosz = offsetof(lnet_ping_info_t, pi_ni[num_ni]);
835 LIBCFS_ALLOC(ping_info, infosz);
836 if (!ping_info) {
837 CERROR("Can't allocate ping info[%d]\n", num_ni);
838 return NULL;
839 }
840
841 ping_info->pi_nnis = num_ni;
842 ping_info->pi_pid = the_lnet.ln_pid;
843 ping_info->pi_magic = LNET_PROTO_PING_MAGIC;
844 ping_info->pi_features = LNET_PING_FEAT_NI_STATUS;
845
846 return ping_info;
847 }
848
849 static inline int
850 lnet_get_ni_count(void)
851 {
852 struct lnet_ni *ni;
853 int count = 0;
854
855 lnet_net_lock(0);
856
857 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list)
858 count++;
859
860 lnet_net_unlock(0);
861
862 return count;
863 }
864
865 static inline void
866 lnet_ping_info_free(lnet_ping_info_t *pinfo)
867 {
868 LIBCFS_FREE(pinfo,
869 offsetof(lnet_ping_info_t,
870 pi_ni[pinfo->pi_nnis]));
871 }
872
873 static void
874 lnet_ping_info_destroy(void)
875 {
876 struct lnet_ni *ni;
877
878 lnet_net_lock(LNET_LOCK_EX);
879
880 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
881 lnet_ni_lock(ni);
882 ni->ni_status = NULL;
883 lnet_ni_unlock(ni);
884 }
885
886 lnet_ping_info_free(the_lnet.ln_ping_info);
887 the_lnet.ln_ping_info = NULL;
888
889 lnet_net_unlock(LNET_LOCK_EX);
890 }
891
892 static void
893 lnet_ping_event_handler(lnet_event_t *event)
894 {
895 lnet_ping_info_t *pinfo = event->md.user_ptr;
896
897 if (event->unlinked)
898 pinfo->pi_features = LNET_PING_FEAT_INVAL;
899 }
900
901 static int
902 lnet_ping_info_setup(lnet_ping_info_t **ppinfo, lnet_handle_md_t *md_handle,
903 int ni_count, bool set_eq)
904 {
905 lnet_process_id_t id = {LNET_NID_ANY, LNET_PID_ANY};
906 lnet_handle_me_t me_handle;
907 lnet_md_t md = { NULL };
908 int rc, rc2;
909
910 if (set_eq) {
911 rc = LNetEQAlloc(0, lnet_ping_event_handler,
912 &the_lnet.ln_ping_target_eq);
913 if (rc) {
914 CERROR("Can't allocate ping EQ: %d\n", rc);
915 return rc;
916 }
917 }
918
919 *ppinfo = lnet_ping_info_create(ni_count);
920 if (!*ppinfo) {
921 rc = -ENOMEM;
922 goto failed_0;
923 }
924
925 rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
926 LNET_PROTO_PING_MATCHBITS, 0,
927 LNET_UNLINK, LNET_INS_AFTER,
928 &me_handle);
929 if (rc) {
930 CERROR("Can't create ping ME: %d\n", rc);
931 goto failed_1;
932 }
933
934 /* initialize md content */
935 md.start = *ppinfo;
936 md.length = offsetof(lnet_ping_info_t,
937 pi_ni[(*ppinfo)->pi_nnis]);
938 md.threshold = LNET_MD_THRESH_INF;
939 md.max_size = 0;
940 md.options = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
941 LNET_MD_MANAGE_REMOTE;
942 md.user_ptr = NULL;
943 md.eq_handle = the_lnet.ln_ping_target_eq;
944 md.user_ptr = *ppinfo;
945
946 rc = LNetMDAttach(me_handle, md, LNET_RETAIN, md_handle);
947 if (rc) {
948 CERROR("Can't attach ping MD: %d\n", rc);
949 goto failed_2;
950 }
951
952 return 0;
953
954 failed_2:
955 rc2 = LNetMEUnlink(me_handle);
956 LASSERT(!rc2);
957 failed_1:
958 lnet_ping_info_free(*ppinfo);
959 *ppinfo = NULL;
960 failed_0:
961 if (set_eq)
962 LNetEQFree(the_lnet.ln_ping_target_eq);
963 return rc;
964 }
965
966 static void
967 lnet_ping_md_unlink(lnet_ping_info_t *pinfo, lnet_handle_md_t *md_handle)
968 {
969 sigset_t blocked = cfs_block_allsigs();
970
971 LNetMDUnlink(*md_handle);
972 LNetInvalidateHandle(md_handle);
973
974 /* NB md could be busy; this just starts the unlink */
975 while (pinfo->pi_features != LNET_PING_FEAT_INVAL) {
976 CDEBUG(D_NET, "Still waiting for ping MD to unlink\n");
977 set_current_state(TASK_UNINTERRUPTIBLE);
978 schedule_timeout(cfs_time_seconds(1));
979 }
980
981 cfs_restore_sigs(blocked);
982 }
983
984 static void
985 lnet_ping_info_install_locked(lnet_ping_info_t *ping_info)
986 {
987 lnet_ni_status_t *ns;
988 lnet_ni_t *ni;
989 int i = 0;
990
991 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
992 LASSERT(i < ping_info->pi_nnis);
993
994 ns = &ping_info->pi_ni[i];
995
996 ns->ns_nid = ni->ni_nid;
997
998 lnet_ni_lock(ni);
999 ns->ns_status = (ni->ni_status) ?
1000 ni->ni_status->ns_status : LNET_NI_STATUS_UP;
1001 ni->ni_status = ns;
1002 lnet_ni_unlock(ni);
1003
1004 i++;
1005 }
1006 }
1007
1008 static void
1009 lnet_ping_target_update(lnet_ping_info_t *pinfo, lnet_handle_md_t md_handle)
1010 {
1011 lnet_ping_info_t *old_pinfo = NULL;
1012 lnet_handle_md_t old_md;
1013
1014 /* switch the NIs to point to the new ping info created */
1015 lnet_net_lock(LNET_LOCK_EX);
1016
1017 if (!the_lnet.ln_routing)
1018 pinfo->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1019 lnet_ping_info_install_locked(pinfo);
1020
1021 if (the_lnet.ln_ping_info) {
1022 old_pinfo = the_lnet.ln_ping_info;
1023 old_md = the_lnet.ln_ping_target_md;
1024 }
1025 the_lnet.ln_ping_target_md = md_handle;
1026 the_lnet.ln_ping_info = pinfo;
1027
1028 lnet_net_unlock(LNET_LOCK_EX);
1029
1030 if (old_pinfo) {
1031 /* unlink the old ping info */
1032 lnet_ping_md_unlink(old_pinfo, &old_md);
1033 lnet_ping_info_free(old_pinfo);
1034 }
1035 }
1036
1037 static void
1038 lnet_ping_target_fini(void)
1039 {
1040 int rc;
1041
1042 lnet_ping_md_unlink(the_lnet.ln_ping_info,
1043 &the_lnet.ln_ping_target_md);
1044
1045 rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1046 LASSERT(!rc);
1047
1048 lnet_ping_info_destroy();
1049 }
1050
1051 static int
1052 lnet_ni_tq_credits(lnet_ni_t *ni)
1053 {
1054 int credits;
1055
1056 LASSERT(ni->ni_ncpts >= 1);
1057
1058 if (ni->ni_ncpts == 1)
1059 return ni->ni_maxtxcredits;
1060
1061 credits = ni->ni_maxtxcredits / ni->ni_ncpts;
1062 credits = max(credits, 8 * ni->ni_peertxcredits);
1063 credits = min(credits, ni->ni_maxtxcredits);
1064
1065 return credits;
1066 }
1067
1068 static void
1069 lnet_ni_unlink_locked(lnet_ni_t *ni)
1070 {
1071 if (!list_empty(&ni->ni_cptlist)) {
1072 list_del_init(&ni->ni_cptlist);
1073 lnet_ni_decref_locked(ni, 0);
1074 }
1075
1076 /* move it to zombie list and nobody can find it anymore */
1077 LASSERT(!list_empty(&ni->ni_list));
1078 list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
1079 lnet_ni_decref_locked(ni, 0); /* drop ln_nis' ref */
1080 }
1081
1082 static void
1083 lnet_clear_zombies_nis_locked(void)
1084 {
1085 int i;
1086 int islo;
1087 lnet_ni_t *ni;
1088
1089 /*
1090 * Now wait for the NI's I just nuked to show up on ln_zombie_nis
1091 * and shut them down in guaranteed thread context
1092 */
1093 i = 2;
1094 while (!list_empty(&the_lnet.ln_nis_zombie)) {
1095 int *ref;
1096 int j;
1097
1098 ni = list_entry(the_lnet.ln_nis_zombie.next,
1099 lnet_ni_t, ni_list);
1100 list_del_init(&ni->ni_list);
1101 cfs_percpt_for_each(ref, j, ni->ni_refs) {
1102 if (!*ref)
1103 continue;
1104 /* still busy, add it back to zombie list */
1105 list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
1106 break;
1107 }
1108
1109 if (!list_empty(&ni->ni_list)) {
1110 lnet_net_unlock(LNET_LOCK_EX);
1111 ++i;
1112 if ((i & (-i)) == i) {
1113 CDEBUG(D_WARNING, "Waiting for zombie LNI %s\n",
1114 libcfs_nid2str(ni->ni_nid));
1115 }
1116 set_current_state(TASK_UNINTERRUPTIBLE);
1117 schedule_timeout(cfs_time_seconds(1));
1118 lnet_net_lock(LNET_LOCK_EX);
1119 continue;
1120 }
1121
1122 ni->ni_lnd->lnd_refcount--;
1123 lnet_net_unlock(LNET_LOCK_EX);
1124
1125 islo = ni->ni_lnd->lnd_type == LOLND;
1126
1127 LASSERT(!in_interrupt());
1128 ni->ni_lnd->lnd_shutdown(ni);
1129
1130 /*
1131 * can't deref lnd anymore now; it might have unregistered
1132 * itself...
1133 */
1134 if (!islo)
1135 CDEBUG(D_LNI, "Removed LNI %s\n",
1136 libcfs_nid2str(ni->ni_nid));
1137
1138 lnet_ni_free(ni);
1139 i = 2;
1140
1141 lnet_net_lock(LNET_LOCK_EX);
1142 }
1143 }
1144
1145 static void
1146 lnet_shutdown_lndnis(void)
1147 {
1148 lnet_ni_t *ni;
1149 int i;
1150
1151 /* NB called holding the global mutex */
1152
1153 /* All quiet on the API front */
1154 LASSERT(!the_lnet.ln_shutdown);
1155 LASSERT(!the_lnet.ln_refcount);
1156 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
1157
1158 lnet_net_lock(LNET_LOCK_EX);
1159 the_lnet.ln_shutdown = 1; /* flag shutdown */
1160
1161 /* Unlink NIs from the global table */
1162 while (!list_empty(&the_lnet.ln_nis)) {
1163 ni = list_entry(the_lnet.ln_nis.next,
1164 lnet_ni_t, ni_list);
1165 lnet_ni_unlink_locked(ni);
1166 }
1167
1168 /* Drop the cached eqwait NI. */
1169 if (the_lnet.ln_eq_waitni) {
1170 lnet_ni_decref_locked(the_lnet.ln_eq_waitni, 0);
1171 the_lnet.ln_eq_waitni = NULL;
1172 }
1173
1174 /* Drop the cached loopback NI. */
1175 if (the_lnet.ln_loni) {
1176 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
1177 the_lnet.ln_loni = NULL;
1178 }
1179
1180 lnet_net_unlock(LNET_LOCK_EX);
1181
1182 /*
1183 * Clear lazy portals and drop delayed messages which hold refs
1184 * on their lnet_msg_t::msg_rxpeer
1185 */
1186 for (i = 0; i < the_lnet.ln_nportals; i++)
1187 LNetClearLazyPortal(i);
1188
1189 /*
1190 * Clear the peer table and wait for all peers to go (they hold refs on
1191 * their NIs)
1192 */
1193 lnet_peer_tables_cleanup(NULL);
1194
1195 lnet_net_lock(LNET_LOCK_EX);
1196
1197 lnet_clear_zombies_nis_locked();
1198 the_lnet.ln_shutdown = 0;
1199 lnet_net_unlock(LNET_LOCK_EX);
1200 }
1201
1202 /* shutdown down the NI and release refcount */
1203 static void
1204 lnet_shutdown_lndni(struct lnet_ni *ni)
1205 {
1206 lnet_net_lock(LNET_LOCK_EX);
1207 lnet_ni_unlink_locked(ni);
1208 lnet_net_unlock(LNET_LOCK_EX);
1209
1210 /* Do peer table cleanup for this ni */
1211 lnet_peer_tables_cleanup(ni);
1212
1213 lnet_net_lock(LNET_LOCK_EX);
1214 lnet_clear_zombies_nis_locked();
1215 lnet_net_unlock(LNET_LOCK_EX);
1216 }
1217
1218 static int
1219 lnet_startup_lndni(struct lnet_ni *ni, __s32 peer_timeout,
1220 __s32 peer_cr, __s32 peer_buf_cr, __s32 credits)
1221 {
1222 int rc = -EINVAL;
1223 int lnd_type;
1224 lnd_t *lnd;
1225 struct lnet_tx_queue *tq;
1226 int i;
1227
1228 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1229
1230 LASSERT(libcfs_isknown_lnd(lnd_type));
1231
1232 if (lnd_type == CIBLND || lnd_type == OPENIBLND ||
1233 lnd_type == IIBLND || lnd_type == VIBLND) {
1234 CERROR("LND %s obsoleted\n", libcfs_lnd2str(lnd_type));
1235 goto failed0;
1236 }
1237
1238 /* Make sure this new NI is unique. */
1239 lnet_net_lock(LNET_LOCK_EX);
1240 rc = lnet_net_unique(LNET_NIDNET(ni->ni_nid), &the_lnet.ln_nis);
1241 lnet_net_unlock(LNET_LOCK_EX);
1242 if (!rc) {
1243 if (lnd_type == LOLND) {
1244 lnet_ni_free(ni);
1245 return 0;
1246 }
1247
1248 CERROR("Net %s is not unique\n",
1249 libcfs_net2str(LNET_NIDNET(ni->ni_nid)));
1250 rc = -EEXIST;
1251 goto failed0;
1252 }
1253
1254 mutex_lock(&the_lnet.ln_lnd_mutex);
1255 lnd = lnet_find_lnd_by_type(lnd_type);
1256
1257 if (!lnd) {
1258 mutex_unlock(&the_lnet.ln_lnd_mutex);
1259 rc = request_module("%s", libcfs_lnd2modname(lnd_type));
1260 mutex_lock(&the_lnet.ln_lnd_mutex);
1261
1262 lnd = lnet_find_lnd_by_type(lnd_type);
1263 if (!lnd) {
1264 mutex_unlock(&the_lnet.ln_lnd_mutex);
1265 CERROR("Can't load LND %s, module %s, rc=%d\n",
1266 libcfs_lnd2str(lnd_type),
1267 libcfs_lnd2modname(lnd_type), rc);
1268 rc = -EINVAL;
1269 goto failed0;
1270 }
1271 }
1272
1273 lnet_net_lock(LNET_LOCK_EX);
1274 lnd->lnd_refcount++;
1275 lnet_net_unlock(LNET_LOCK_EX);
1276
1277 ni->ni_lnd = lnd;
1278
1279 rc = lnd->lnd_startup(ni);
1280
1281 mutex_unlock(&the_lnet.ln_lnd_mutex);
1282
1283 if (rc) {
1284 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
1285 rc, libcfs_lnd2str(lnd->lnd_type));
1286 lnet_net_lock(LNET_LOCK_EX);
1287 lnd->lnd_refcount--;
1288 lnet_net_unlock(LNET_LOCK_EX);
1289 goto failed0;
1290 }
1291
1292 /*
1293 * If given some LND tunable parameters, parse those now to
1294 * override the values in the NI structure.
1295 */
1296 if (peer_buf_cr >= 0)
1297 ni->ni_peerrtrcredits = peer_buf_cr;
1298 if (peer_timeout >= 0)
1299 ni->ni_peertimeout = peer_timeout;
1300 /*
1301 * TODO
1302 * Note: For now, don't allow the user to change
1303 * peertxcredits as this number is used in the
1304 * IB LND to control queue depth.
1305 * if (peer_cr != -1)
1306 * ni->ni_peertxcredits = peer_cr;
1307 */
1308 if (credits >= 0)
1309 ni->ni_maxtxcredits = credits;
1310
1311 LASSERT(ni->ni_peertimeout <= 0 || lnd->lnd_query);
1312
1313 lnet_net_lock(LNET_LOCK_EX);
1314 /* refcount for ln_nis */
1315 lnet_ni_addref_locked(ni, 0);
1316 list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1317 if (ni->ni_cpts) {
1318 lnet_ni_addref_locked(ni, 0);
1319 list_add_tail(&ni->ni_cptlist, &the_lnet.ln_nis_cpt);
1320 }
1321
1322 lnet_net_unlock(LNET_LOCK_EX);
1323
1324 if (lnd->lnd_type == LOLND) {
1325 lnet_ni_addref(ni);
1326 LASSERT(!the_lnet.ln_loni);
1327 the_lnet.ln_loni = ni;
1328 return 0;
1329 }
1330
1331 if (!ni->ni_peertxcredits || !ni->ni_maxtxcredits) {
1332 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1333 libcfs_lnd2str(lnd->lnd_type),
1334 !ni->ni_peertxcredits ?
1335 "" : "per-peer ");
1336 /*
1337 * shutdown the NI since if we get here then it must've already
1338 * been started
1339 */
1340 lnet_shutdown_lndni(ni);
1341 return -EINVAL;
1342 }
1343
1344 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1345 tq->tq_credits_min =
1346 tq->tq_credits_max =
1347 tq->tq_credits = lnet_ni_tq_credits(ni);
1348 }
1349
1350 CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1351 libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1352 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1353 ni->ni_peerrtrcredits, ni->ni_peertimeout);
1354
1355 return 0;
1356 failed0:
1357 lnet_ni_free(ni);
1358 return rc;
1359 }
1360
1361 static int
1362 lnet_startup_lndnis(struct list_head *nilist)
1363 {
1364 struct lnet_ni *ni;
1365 int rc;
1366 int lnd_type;
1367 int ni_count = 0;
1368
1369 while (!list_empty(nilist)) {
1370 ni = list_entry(nilist->next, lnet_ni_t, ni_list);
1371 list_del(&ni->ni_list);
1372 rc = lnet_startup_lndni(ni, -1, -1, -1, -1);
1373
1374 if (rc < 0)
1375 goto failed;
1376
1377 ni_count++;
1378 }
1379
1380 if (the_lnet.ln_eq_waitni && ni_count > 1) {
1381 lnd_type = the_lnet.ln_eq_waitni->ni_lnd->lnd_type;
1382 LCONSOLE_ERROR_MSG(0x109, "LND %s can only run single-network\n",
1383 libcfs_lnd2str(lnd_type));
1384 rc = -EINVAL;
1385 goto failed;
1386 }
1387
1388 return ni_count;
1389 failed:
1390 lnet_shutdown_lndnis();
1391
1392 return rc;
1393 }
1394
1395 /**
1396 * Initialize LNet library.
1397 *
1398 * Only userspace program needs to call this function - it's automatically
1399 * called in the kernel at module loading time. Caller has to call lnet_fini()
1400 * after a call to lnet_init(), if and only if the latter returned 0. It must
1401 * be called exactly once.
1402 *
1403 * \return 0 on success, and -ve on failures.
1404 */
1405 int
1406 lnet_init(void)
1407 {
1408 int rc;
1409
1410 lnet_assert_wire_constants();
1411 LASSERT(!the_lnet.ln_init);
1412
1413 memset(&the_lnet, 0, sizeof(the_lnet));
1414
1415 /* refer to global cfs_cpt_table for now */
1416 the_lnet.ln_cpt_table = cfs_cpt_table;
1417 the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_table);
1418
1419 LASSERT(the_lnet.ln_cpt_number > 0);
1420 if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1421 /* we are under risk of consuming all lh_cookie */
1422 CERROR("Can't have %d CPTs for LNet (max allowed is %d), please change setting of CPT-table and retry\n",
1423 the_lnet.ln_cpt_number, LNET_CPT_MAX);
1424 return -1;
1425 }
1426
1427 while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1428 the_lnet.ln_cpt_bits++;
1429
1430 rc = lnet_create_locks();
1431 if (rc) {
1432 CERROR("Can't create LNet global locks: %d\n", rc);
1433 return -1;
1434 }
1435
1436 the_lnet.ln_refcount = 0;
1437 the_lnet.ln_init = 1;
1438 LNetInvalidateHandle(&the_lnet.ln_rc_eqh);
1439 INIT_LIST_HEAD(&the_lnet.ln_lnds);
1440 INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1441 INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1442
1443 /*
1444 * The hash table size is the number of bits it takes to express the set
1445 * ln_num_routes, minus 1 (better to under estimate than over so we
1446 * don't waste memory).
1447 */
1448 if (rnet_htable_size <= 0)
1449 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1450 else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1451 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1452 the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1453 order_base_2(rnet_htable_size) - 1);
1454
1455 /*
1456 * All LNDs apart from the LOLND are in separate modules. They
1457 * register themselves when their module loads, and unregister
1458 * themselves when their module is unloaded.
1459 */
1460 lnet_register_lnd(&the_lolnd);
1461 return 0;
1462 }
1463
1464 /**
1465 * Finalize LNet library.
1466 *
1467 * Only userspace program needs to call this function. It can be called
1468 * at most once.
1469 *
1470 * \pre lnet_init() called with success.
1471 * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1472 */
1473 void
1474 lnet_fini(void)
1475 {
1476 LASSERT(the_lnet.ln_init);
1477 LASSERT(!the_lnet.ln_refcount);
1478
1479 while (!list_empty(&the_lnet.ln_lnds))
1480 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1481 lnd_t, lnd_list));
1482 lnet_destroy_locks();
1483
1484 the_lnet.ln_init = 0;
1485 }
1486
1487 /**
1488 * Set LNet PID and start LNet interfaces, routing, and forwarding.
1489 *
1490 * Userspace program should call this after a successful call to lnet_init().
1491 * Users must call this function at least once before any other functions.
1492 * For each successful call there must be a corresponding call to
1493 * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1494 * ignored.
1495 *
1496 * The PID used by LNet may be different from the one requested.
1497 * See LNetGetId().
1498 *
1499 * \param requested_pid PID requested by the caller.
1500 *
1501 * \return >= 0 on success, and < 0 error code on failures.
1502 */
1503 int
1504 LNetNIInit(lnet_pid_t requested_pid)
1505 {
1506 int im_a_router = 0;
1507 int rc;
1508 int ni_count;
1509 lnet_ping_info_t *pinfo;
1510 lnet_handle_md_t md_handle;
1511 struct list_head net_head;
1512
1513 INIT_LIST_HEAD(&net_head);
1514
1515 mutex_lock(&the_lnet.ln_api_mutex);
1516
1517 LASSERT(the_lnet.ln_init);
1518 CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1519
1520 if (the_lnet.ln_refcount > 0) {
1521 rc = the_lnet.ln_refcount++;
1522 mutex_unlock(&the_lnet.ln_api_mutex);
1523 return rc;
1524 }
1525
1526 rc = lnet_prepare(requested_pid);
1527 if (rc) {
1528 mutex_unlock(&the_lnet.ln_api_mutex);
1529 return rc;
1530 }
1531
1532 /* Add in the loopback network */
1533 if (!lnet_ni_alloc(LNET_MKNET(LOLND, 0), NULL, &net_head)) {
1534 rc = -ENOMEM;
1535 goto err_empty_list;
1536 }
1537
1538 /*
1539 * If LNet is being initialized via DLC it is possible
1540 * that the user requests not to load module parameters (ones which
1541 * are supported by DLC) on initialization. Therefore, make sure not
1542 * to load networks, routes and forwarding from module parameters
1543 * in this case. On cleanup in case of failure only clean up
1544 * routes if it has been loaded
1545 */
1546 if (!the_lnet.ln_nis_from_mod_params) {
1547 rc = lnet_parse_networks(&net_head, lnet_get_networks());
1548 if (rc < 0)
1549 goto err_empty_list;
1550 }
1551
1552 ni_count = lnet_startup_lndnis(&net_head);
1553 if (ni_count < 0) {
1554 rc = ni_count;
1555 goto err_empty_list;
1556 }
1557
1558 if (!the_lnet.ln_nis_from_mod_params) {
1559 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1560 if (rc)
1561 goto err_shutdown_lndnis;
1562
1563 rc = lnet_check_routes();
1564 if (rc)
1565 goto err_destory_routes;
1566
1567 rc = lnet_rtrpools_alloc(im_a_router);
1568 if (rc)
1569 goto err_destory_routes;
1570 }
1571
1572 rc = lnet_acceptor_start();
1573 if (rc)
1574 goto err_destory_routes;
1575
1576 the_lnet.ln_refcount = 1;
1577 /* Now I may use my own API functions... */
1578
1579 rc = lnet_ping_info_setup(&pinfo, &md_handle, ni_count, true);
1580 if (rc)
1581 goto err_acceptor_stop;
1582
1583 lnet_ping_target_update(pinfo, md_handle);
1584
1585 rc = lnet_router_checker_start();
1586 if (rc)
1587 goto err_stop_ping;
1588
1589 lnet_router_debugfs_init();
1590
1591 mutex_unlock(&the_lnet.ln_api_mutex);
1592
1593 return 0;
1594
1595 err_stop_ping:
1596 lnet_ping_target_fini();
1597 err_acceptor_stop:
1598 the_lnet.ln_refcount = 0;
1599 lnet_acceptor_stop();
1600 err_destory_routes:
1601 if (!the_lnet.ln_nis_from_mod_params)
1602 lnet_destroy_routes();
1603 err_shutdown_lndnis:
1604 lnet_shutdown_lndnis();
1605 err_empty_list:
1606 lnet_unprepare();
1607 LASSERT(rc < 0);
1608 mutex_unlock(&the_lnet.ln_api_mutex);
1609 while (!list_empty(&net_head)) {
1610 struct lnet_ni *ni;
1611
1612 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1613 list_del_init(&ni->ni_list);
1614 lnet_ni_free(ni);
1615 }
1616 return rc;
1617 }
1618 EXPORT_SYMBOL(LNetNIInit);
1619
1620 /**
1621 * Stop LNet interfaces, routing, and forwarding.
1622 *
1623 * Users must call this function once for each successful call to LNetNIInit().
1624 * Once the LNetNIFini() operation has been started, the results of pending
1625 * API operations are undefined.
1626 *
1627 * \return always 0 for current implementation.
1628 */
1629 int
1630 LNetNIFini(void)
1631 {
1632 mutex_lock(&the_lnet.ln_api_mutex);
1633
1634 LASSERT(the_lnet.ln_init);
1635 LASSERT(the_lnet.ln_refcount > 0);
1636
1637 if (the_lnet.ln_refcount != 1) {
1638 the_lnet.ln_refcount--;
1639 } else {
1640 LASSERT(!the_lnet.ln_niinit_self);
1641
1642 lnet_router_debugfs_fini();
1643 lnet_router_checker_stop();
1644 lnet_ping_target_fini();
1645
1646 /* Teardown fns that use my own API functions BEFORE here */
1647 the_lnet.ln_refcount = 0;
1648
1649 lnet_acceptor_stop();
1650 lnet_destroy_routes();
1651 lnet_shutdown_lndnis();
1652 lnet_unprepare();
1653 }
1654
1655 mutex_unlock(&the_lnet.ln_api_mutex);
1656 return 0;
1657 }
1658 EXPORT_SYMBOL(LNetNIFini);
1659
1660 /**
1661 * Grabs the ni data from the ni structure and fills the out
1662 * parameters
1663 *
1664 * \param[in] ni network interface structure
1665 * \param[out] cpt_count the number of cpts the ni is on
1666 * \param[out] nid Network Interface ID
1667 * \param[out] peer_timeout NI peer timeout
1668 * \param[out] peer_tx_crdits NI peer transmit credits
1669 * \param[out] peer_rtr_credits NI peer router credits
1670 * \param[out] max_tx_credits NI max transmit credit
1671 * \param[out] net_config Network configuration
1672 */
1673 static void
1674 lnet_fill_ni_info(struct lnet_ni *ni, __u32 *cpt_count, __u64 *nid,
1675 int *peer_timeout, int *peer_tx_credits,
1676 int *peer_rtr_credits, int *max_tx_credits,
1677 struct lnet_ioctl_net_config *net_config)
1678 {
1679 int i;
1680
1681 if (!ni)
1682 return;
1683
1684 if (!net_config)
1685 return;
1686
1687 BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
1688 ARRAY_SIZE(net_config->ni_interfaces));
1689
1690 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
1691 if (!ni->ni_interfaces[i])
1692 break;
1693
1694 strncpy(net_config->ni_interfaces[i],
1695 ni->ni_interfaces[i],
1696 sizeof(net_config->ni_interfaces[i]));
1697 }
1698
1699 *nid = ni->ni_nid;
1700 *peer_timeout = ni->ni_peertimeout;
1701 *peer_tx_credits = ni->ni_peertxcredits;
1702 *peer_rtr_credits = ni->ni_peerrtrcredits;
1703 *max_tx_credits = ni->ni_maxtxcredits;
1704
1705 net_config->ni_status = ni->ni_status->ns_status;
1706
1707 if (ni->ni_cpts) {
1708 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
1709
1710 for (i = 0; i < num_cpts; i++)
1711 net_config->ni_cpts[i] = ni->ni_cpts[i];
1712
1713 *cpt_count = num_cpts;
1714 }
1715 }
1716
1717 int
1718 lnet_get_net_config(int idx, __u32 *cpt_count, __u64 *nid, int *peer_timeout,
1719 int *peer_tx_credits, int *peer_rtr_credits,
1720 int *max_tx_credits,
1721 struct lnet_ioctl_net_config *net_config)
1722 {
1723 struct lnet_ni *ni;
1724 struct list_head *tmp;
1725 int cpt, i = 0;
1726 int rc = -ENOENT;
1727
1728 cpt = lnet_net_lock_current();
1729
1730 list_for_each(tmp, &the_lnet.ln_nis) {
1731 if (i++ != idx)
1732 continue;
1733
1734 ni = list_entry(tmp, lnet_ni_t, ni_list);
1735 lnet_ni_lock(ni);
1736 lnet_fill_ni_info(ni, cpt_count, nid, peer_timeout,
1737 peer_tx_credits, peer_rtr_credits,
1738 max_tx_credits, net_config);
1739 lnet_ni_unlock(ni);
1740 rc = 0;
1741 break;
1742 }
1743
1744 lnet_net_unlock(cpt);
1745 return rc;
1746 }
1747
1748 int
1749 lnet_dyn_add_ni(lnet_pid_t requested_pid, char *nets,
1750 __s32 peer_timeout, __s32 peer_cr, __s32 peer_buf_cr,
1751 __s32 credits)
1752 {
1753 lnet_ping_info_t *pinfo;
1754 lnet_handle_md_t md_handle;
1755 struct lnet_ni *ni;
1756 struct list_head net_head;
1757 lnet_remotenet_t *rnet;
1758 int rc;
1759
1760 INIT_LIST_HEAD(&net_head);
1761
1762 /* Create a ni structure for the network string */
1763 rc = lnet_parse_networks(&net_head, nets);
1764 if (rc <= 0)
1765 return !rc ? -EINVAL : rc;
1766
1767 mutex_lock(&the_lnet.ln_api_mutex);
1768
1769 if (rc > 1) {
1770 rc = -EINVAL; /* only add one interface per call */
1771 goto failed0;
1772 }
1773
1774 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1775
1776 lnet_net_lock(LNET_LOCK_EX);
1777 rnet = lnet_find_net_locked(LNET_NIDNET(ni->ni_nid));
1778 lnet_net_unlock(LNET_LOCK_EX);
1779 /*
1780 * make sure that the net added doesn't invalidate the current
1781 * configuration LNet is keeping
1782 */
1783 if (rnet) {
1784 CERROR("Adding net %s will invalidate routing configuration\n",
1785 nets);
1786 rc = -EUSERS;
1787 goto failed0;
1788 }
1789
1790 rc = lnet_ping_info_setup(&pinfo, &md_handle, 1 + lnet_get_ni_count(),
1791 false);
1792 if (rc)
1793 goto failed0;
1794
1795 list_del_init(&ni->ni_list);
1796
1797 rc = lnet_startup_lndni(ni, peer_timeout, peer_cr,
1798 peer_buf_cr, credits);
1799 if (rc)
1800 goto failed1;
1801
1802 if (ni->ni_lnd->lnd_accept) {
1803 rc = lnet_acceptor_start();
1804 if (rc < 0) {
1805 /* shutdown the ni that we just started */
1806 CERROR("Failed to start up acceptor thread\n");
1807 lnet_shutdown_lndni(ni);
1808 goto failed1;
1809 }
1810 }
1811
1812 lnet_ping_target_update(pinfo, md_handle);
1813 mutex_unlock(&the_lnet.ln_api_mutex);
1814
1815 return 0;
1816
1817 failed1:
1818 lnet_ping_md_unlink(pinfo, &md_handle);
1819 lnet_ping_info_free(pinfo);
1820 failed0:
1821 mutex_unlock(&the_lnet.ln_api_mutex);
1822 while (!list_empty(&net_head)) {
1823 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1824 list_del_init(&ni->ni_list);
1825 lnet_ni_free(ni);
1826 }
1827 return rc;
1828 }
1829
1830 int
1831 lnet_dyn_del_ni(__u32 net)
1832 {
1833 lnet_ni_t *ni;
1834 lnet_ping_info_t *pinfo;
1835 lnet_handle_md_t md_handle;
1836 int rc;
1837
1838 /* don't allow userspace to shutdown the LOLND */
1839 if (LNET_NETTYP(net) == LOLND)
1840 return -EINVAL;
1841
1842 mutex_lock(&the_lnet.ln_api_mutex);
1843 /* create and link a new ping info, before removing the old one */
1844 rc = lnet_ping_info_setup(&pinfo, &md_handle,
1845 lnet_get_ni_count() - 1, false);
1846 if (rc)
1847 goto out;
1848
1849 ni = lnet_net2ni(net);
1850 if (!ni) {
1851 rc = -EINVAL;
1852 goto failed;
1853 }
1854
1855 /* decrement the reference counter taken by lnet_net2ni() */
1856 lnet_ni_decref_locked(ni, 0);
1857
1858 lnet_shutdown_lndni(ni);
1859
1860 if (!lnet_count_acceptor_nis())
1861 lnet_acceptor_stop();
1862
1863 lnet_ping_target_update(pinfo, md_handle);
1864 goto out;
1865 failed:
1866 lnet_ping_md_unlink(pinfo, &md_handle);
1867 lnet_ping_info_free(pinfo);
1868 out:
1869 mutex_unlock(&the_lnet.ln_api_mutex);
1870
1871 return rc;
1872 }
1873
1874 /**
1875 * LNet ioctl handler.
1876 *
1877 */
1878 int
1879 LNetCtl(unsigned int cmd, void *arg)
1880 {
1881 struct libcfs_ioctl_data *data = arg;
1882 struct lnet_ioctl_config_data *config;
1883 lnet_process_id_t id = {0};
1884 lnet_ni_t *ni;
1885 int rc;
1886 unsigned long secs_passed;
1887
1888 LASSERT(the_lnet.ln_init);
1889
1890 switch (cmd) {
1891 case IOC_LIBCFS_GET_NI:
1892 rc = LNetGetId(data->ioc_count, &id);
1893 data->ioc_nid = id.nid;
1894 return rc;
1895
1896 case IOC_LIBCFS_FAIL_NID:
1897 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1898
1899 case IOC_LIBCFS_ADD_ROUTE:
1900 config = arg;
1901
1902 if (config->cfg_hdr.ioc_len < sizeof(*config))
1903 return -EINVAL;
1904
1905 mutex_lock(&the_lnet.ln_api_mutex);
1906 rc = lnet_add_route(config->cfg_net,
1907 config->cfg_config_u.cfg_route.rtr_hop,
1908 config->cfg_nid,
1909 config->cfg_config_u.cfg_route.rtr_priority);
1910 mutex_unlock(&the_lnet.ln_api_mutex);
1911 return rc ? rc : lnet_check_routes();
1912
1913 case IOC_LIBCFS_DEL_ROUTE:
1914 config = arg;
1915
1916 if (config->cfg_hdr.ioc_len < sizeof(*config))
1917 return -EINVAL;
1918
1919 mutex_lock(&the_lnet.ln_api_mutex);
1920 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
1921 mutex_unlock(&the_lnet.ln_api_mutex);
1922 return rc;
1923
1924 case IOC_LIBCFS_GET_ROUTE:
1925 config = arg;
1926
1927 if (config->cfg_hdr.ioc_len < sizeof(*config))
1928 return -EINVAL;
1929
1930 return lnet_get_route(config->cfg_count,
1931 &config->cfg_net,
1932 &config->cfg_config_u.cfg_route.rtr_hop,
1933 &config->cfg_nid,
1934 &config->cfg_config_u.cfg_route.rtr_flags,
1935 &config->cfg_config_u.cfg_route.rtr_priority);
1936
1937 case IOC_LIBCFS_GET_NET: {
1938 struct lnet_ioctl_net_config *net_config;
1939 size_t total = sizeof(*config) + sizeof(*net_config);
1940
1941 config = arg;
1942
1943 if (config->cfg_hdr.ioc_len < total)
1944 return -EINVAL;
1945
1946 net_config = (struct lnet_ioctl_net_config *)
1947 config->cfg_bulk;
1948 if (!net_config)
1949 return -EINVAL;
1950
1951 return lnet_get_net_config(config->cfg_count,
1952 &config->cfg_ncpts,
1953 &config->cfg_nid,
1954 &config->cfg_config_u.cfg_net.net_peer_timeout,
1955 &config->cfg_config_u.cfg_net.net_peer_tx_credits,
1956 &config->cfg_config_u.cfg_net.net_peer_rtr_credits,
1957 &config->cfg_config_u.cfg_net.net_max_tx_credits,
1958 net_config);
1959 }
1960
1961 case IOC_LIBCFS_GET_LNET_STATS: {
1962 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
1963
1964 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
1965 return -EINVAL;
1966
1967 lnet_counters_get(&lnet_stats->st_cntrs);
1968 return 0;
1969 }
1970
1971 case IOC_LIBCFS_CONFIG_RTR:
1972 config = arg;
1973
1974 if (config->cfg_hdr.ioc_len < sizeof(*config))
1975 return -EINVAL;
1976
1977 mutex_lock(&the_lnet.ln_api_mutex);
1978 if (config->cfg_config_u.cfg_buffers.buf_enable) {
1979 rc = lnet_rtrpools_enable();
1980 mutex_unlock(&the_lnet.ln_api_mutex);
1981 return rc;
1982 }
1983 lnet_rtrpools_disable();
1984 mutex_unlock(&the_lnet.ln_api_mutex);
1985 return 0;
1986
1987 case IOC_LIBCFS_ADD_BUF:
1988 config = arg;
1989
1990 if (config->cfg_hdr.ioc_len < sizeof(*config))
1991 return -EINVAL;
1992
1993 mutex_lock(&the_lnet.ln_api_mutex);
1994 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.buf_tiny,
1995 config->cfg_config_u.cfg_buffers.buf_small,
1996 config->cfg_config_u.cfg_buffers.buf_large);
1997 mutex_unlock(&the_lnet.ln_api_mutex);
1998 return rc;
1999
2000 case IOC_LIBCFS_GET_BUF: {
2001 struct lnet_ioctl_pool_cfg *pool_cfg;
2002 size_t total = sizeof(*config) + sizeof(*pool_cfg);
2003
2004 config = arg;
2005
2006 if (config->cfg_hdr.ioc_len < total)
2007 return -EINVAL;
2008
2009 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
2010 return lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
2011 }
2012
2013 case IOC_LIBCFS_GET_PEER_INFO: {
2014 struct lnet_ioctl_peer *peer_info = arg;
2015
2016 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
2017 return -EINVAL;
2018
2019 return lnet_get_peer_info(peer_info->pr_count,
2020 &peer_info->pr_nid,
2021 peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
2022 &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
2023 &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
2024 &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
2025 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
2026 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
2027 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_rtr_credits,
2028 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
2029 }
2030
2031 case IOC_LIBCFS_NOTIFY_ROUTER:
2032 secs_passed = (ktime_get_real_seconds() - data->ioc_u64[0]);
2033 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
2034 jiffies - secs_passed * HZ);
2035
2036 case IOC_LIBCFS_LNET_DIST:
2037 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
2038 if (rc < 0 && rc != -EHOSTUNREACH)
2039 return rc;
2040
2041 data->ioc_u32[0] = rc;
2042 return 0;
2043
2044 case IOC_LIBCFS_TESTPROTOCOMPAT:
2045 lnet_net_lock(LNET_LOCK_EX);
2046 the_lnet.ln_testprotocompat = data->ioc_flags;
2047 lnet_net_unlock(LNET_LOCK_EX);
2048 return 0;
2049
2050 case IOC_LIBCFS_PING:
2051 id.nid = data->ioc_nid;
2052 id.pid = data->ioc_u32[0];
2053 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
2054 data->ioc_pbuf1,
2055 data->ioc_plen1 / sizeof(lnet_process_id_t));
2056 if (rc < 0)
2057 return rc;
2058 data->ioc_count = rc;
2059 return 0;
2060
2061 default:
2062 ni = lnet_net2ni(data->ioc_net);
2063 if (!ni)
2064 return -EINVAL;
2065
2066 if (!ni->ni_lnd->lnd_ctl)
2067 rc = -EINVAL;
2068 else
2069 rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
2070
2071 lnet_ni_decref(ni);
2072 return rc;
2073 }
2074 /* not reached */
2075 }
2076 EXPORT_SYMBOL(LNetCtl);
2077
2078 void LNetDebugPeer(lnet_process_id_t id)
2079 {
2080 lnet_debug_peer(id.nid);
2081 }
2082 EXPORT_SYMBOL(LNetDebugPeer);
2083
2084 /**
2085 * Retrieve the lnet_process_id_t ID of LNet interface at \a index. Note that
2086 * all interfaces share a same PID, as requested by LNetNIInit().
2087 *
2088 * \param index Index of the interface to look up.
2089 * \param id On successful return, this location will hold the
2090 * lnet_process_id_t ID of the interface.
2091 *
2092 * \retval 0 If an interface exists at \a index.
2093 * \retval -ENOENT If no interface has been found.
2094 */
2095 int
2096 LNetGetId(unsigned int index, lnet_process_id_t *id)
2097 {
2098 struct lnet_ni *ni;
2099 struct list_head *tmp;
2100 int cpt;
2101 int rc = -ENOENT;
2102
2103 LASSERT(the_lnet.ln_init);
2104
2105 /* LNetNI initilization failed? */
2106 if (!the_lnet.ln_refcount)
2107 return rc;
2108
2109 cpt = lnet_net_lock_current();
2110
2111 list_for_each(tmp, &the_lnet.ln_nis) {
2112 if (index--)
2113 continue;
2114
2115 ni = list_entry(tmp, lnet_ni_t, ni_list);
2116
2117 id->nid = ni->ni_nid;
2118 id->pid = the_lnet.ln_pid;
2119 rc = 0;
2120 break;
2121 }
2122
2123 lnet_net_unlock(cpt);
2124 return rc;
2125 }
2126 EXPORT_SYMBOL(LNetGetId);
2127
2128 /**
2129 * Print a string representation of handle \a h into buffer \a str of
2130 * \a len bytes.
2131 */
2132 void
2133 LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
2134 {
2135 snprintf(str, len, "%#llx", h.cookie);
2136 }
2137 EXPORT_SYMBOL(LNetSnprintHandle);
2138
2139 static int lnet_ping(lnet_process_id_t id, int timeout_ms,
2140 lnet_process_id_t __user *ids, int n_ids)
2141 {
2142 lnet_handle_eq_t eqh;
2143 lnet_handle_md_t mdh;
2144 lnet_event_t event;
2145 lnet_md_t md = { NULL };
2146 int which;
2147 int unlinked = 0;
2148 int replied = 0;
2149 const int a_long_time = 60000; /* mS */
2150 int infosz;
2151 lnet_ping_info_t *info;
2152 lnet_process_id_t tmpid;
2153 int i;
2154 int nob;
2155 int rc;
2156 int rc2;
2157 sigset_t blocked;
2158
2159 infosz = offsetof(lnet_ping_info_t, pi_ni[n_ids]);
2160
2161 if (n_ids <= 0 ||
2162 id.nid == LNET_NID_ANY ||
2163 timeout_ms > 500000 || /* arbitrary limit! */
2164 n_ids > 20) /* arbitrary limit! */
2165 return -EINVAL;
2166
2167 if (id.pid == LNET_PID_ANY)
2168 id.pid = LNET_PID_LUSTRE;
2169
2170 LIBCFS_ALLOC(info, infosz);
2171 if (!info)
2172 return -ENOMEM;
2173
2174 /* NB 2 events max (including any unlink event) */
2175 rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
2176 if (rc) {
2177 CERROR("Can't allocate EQ: %d\n", rc);
2178 goto out_0;
2179 }
2180
2181 /* initialize md content */
2182 md.start = info;
2183 md.length = infosz;
2184 md.threshold = 2; /*GET/REPLY*/
2185 md.max_size = 0;
2186 md.options = LNET_MD_TRUNCATE;
2187 md.user_ptr = NULL;
2188 md.eq_handle = eqh;
2189
2190 rc = LNetMDBind(md, LNET_UNLINK, &mdh);
2191 if (rc) {
2192 CERROR("Can't bind MD: %d\n", rc);
2193 goto out_1;
2194 }
2195
2196 rc = LNetGet(LNET_NID_ANY, mdh, id,
2197 LNET_RESERVED_PORTAL,
2198 LNET_PROTO_PING_MATCHBITS, 0);
2199
2200 if (rc) {
2201 /* Don't CERROR; this could be deliberate! */
2202
2203 rc2 = LNetMDUnlink(mdh);
2204 LASSERT(!rc2);
2205
2206 /* NB must wait for the UNLINK event below... */
2207 unlinked = 1;
2208 timeout_ms = a_long_time;
2209 }
2210
2211 do {
2212 /* MUST block for unlink to complete */
2213 if (unlinked)
2214 blocked = cfs_block_allsigs();
2215
2216 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
2217
2218 if (unlinked)
2219 cfs_restore_sigs(blocked);
2220
2221 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
2222 (rc2 <= 0) ? -1 : event.type,
2223 (rc2 <= 0) ? -1 : event.status,
2224 (rc2 > 0 && event.unlinked) ? " unlinked" : "");
2225
2226 LASSERT(rc2 != -EOVERFLOW); /* can't miss anything */
2227
2228 if (rc2 <= 0 || event.status) {
2229 /* timeout or error */
2230 if (!replied && !rc)
2231 rc = (rc2 < 0) ? rc2 :
2232 !rc2 ? -ETIMEDOUT :
2233 event.status;
2234
2235 if (!unlinked) {
2236 /* Ensure completion in finite time... */
2237 LNetMDUnlink(mdh);
2238 /* No assertion (racing with network) */
2239 unlinked = 1;
2240 timeout_ms = a_long_time;
2241 } else if (!rc2) {
2242 /* timed out waiting for unlink */
2243 CWARN("ping %s: late network completion\n",
2244 libcfs_id2str(id));
2245 }
2246 } else if (event.type == LNET_EVENT_REPLY) {
2247 replied = 1;
2248 rc = event.mlength;
2249 }
2250
2251 } while (rc2 <= 0 || !event.unlinked);
2252
2253 if (!replied) {
2254 if (rc >= 0)
2255 CWARN("%s: Unexpected rc >= 0 but no reply!\n",
2256 libcfs_id2str(id));
2257 rc = -EIO;
2258 goto out_1;
2259 }
2260
2261 nob = rc;
2262 LASSERT(nob >= 0 && nob <= infosz);
2263
2264 rc = -EPROTO; /* if I can't parse... */
2265
2266 if (nob < 8) {
2267 /* can't check magic/version */
2268 CERROR("%s: ping info too short %d\n",
2269 libcfs_id2str(id), nob);
2270 goto out_1;
2271 }
2272
2273 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
2274 lnet_swap_pinginfo(info);
2275 } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
2276 CERROR("%s: Unexpected magic %08x\n",
2277 libcfs_id2str(id), info->pi_magic);
2278 goto out_1;
2279 }
2280
2281 if (!(info->pi_features & LNET_PING_FEAT_NI_STATUS)) {
2282 CERROR("%s: ping w/o NI status: 0x%x\n",
2283 libcfs_id2str(id), info->pi_features);
2284 goto out_1;
2285 }
2286
2287 if (nob < offsetof(lnet_ping_info_t, pi_ni[0])) {
2288 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
2289 nob, (int)offsetof(lnet_ping_info_t, pi_ni[0]));
2290 goto out_1;
2291 }
2292
2293 if (info->pi_nnis < n_ids)
2294 n_ids = info->pi_nnis;
2295
2296 if (nob < offsetof(lnet_ping_info_t, pi_ni[n_ids])) {
2297 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
2298 nob, (int)offsetof(lnet_ping_info_t, pi_ni[n_ids]));
2299 goto out_1;
2300 }
2301
2302 rc = -EFAULT; /* If I SEGV... */
2303
2304 memset(&tmpid, 0, sizeof(tmpid));
2305 for (i = 0; i < n_ids; i++) {
2306 tmpid.pid = info->pi_pid;
2307 tmpid.nid = info->pi_ni[i].ns_nid;
2308 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
2309 goto out_1;
2310 }
2311 rc = info->pi_nnis;
2312
2313 out_1:
2314 rc2 = LNetEQFree(eqh);
2315 if (rc2)
2316 CERROR("rc2 %d\n", rc2);
2317 LASSERT(!rc2);
2318
2319 out_0:
2320 LIBCFS_FREE(info, infosz);
2321 return rc;
2322 }
Linux kernel - Deliverables
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