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.gnu.org/licenses/gpl-2.0.html
19 *
20 * GPL HEADER END
21 */
22 /*
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
25 *
26 * Copyright (c) 2011, 2015, Intel Corporation.
27 */
28 /*
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
31 */
32
33 #define DEBUG_SUBSYSTEM S_LNET
34 #include <linux/log2.h>
35 #include <linux/ktime.h>
36
37 #include <linux/lnet/lib-lnet.h>
38 #include <uapi/linux/lnet/lnet-dlc.h>
39
40 #define D_LNI D_CONSOLE
41
42 struct lnet the_lnet; /* THE state of the network */
43 EXPORT_SYMBOL(the_lnet);
44
45 static char *ip2nets = "";
46 module_param(ip2nets, charp, 0444);
47 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
48
49 static char *networks = "";
50 module_param(networks, charp, 0444);
51 MODULE_PARM_DESC(networks, "local networks");
52
53 static char *routes = "";
54 module_param(routes, charp, 0444);
55 MODULE_PARM_DESC(routes, "routes to non-local networks");
56
57 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
58 module_param(rnet_htable_size, int, 0444);
59 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
60
61 static int lnet_ping(struct lnet_process_id id, int timeout_ms,
62 struct lnet_process_id __user *ids, int n_ids);
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 && *ip2nets) {
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) {
82 rc = lnet_parse_ip2nets(&nets, ip2nets);
83 return !rc ? nets : NULL;
84 }
85
86 if (*networks)
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 init_waitqueue_head(&the_lnet.ln_rc_waitq);
98 mutex_init(&the_lnet.ln_lnd_mutex);
99 mutex_init(&the_lnet.ln_api_mutex);
100 }
101
102 static int
lnet_create_remote_nets_table(void)103 lnet_create_remote_nets_table(void)
104 {
105 int i;
106 struct list_head *hash;
107
108 LASSERT(!the_lnet.ln_remote_nets_hash);
109 LASSERT(the_lnet.ln_remote_nets_hbits > 0);
110 LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
111 if (!hash) {
112 CERROR("Failed to create remote nets hash table\n");
113 return -ENOMEM;
114 }
115
116 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
117 INIT_LIST_HEAD(&hash[i]);
118 the_lnet.ln_remote_nets_hash = hash;
119 return 0;
120 }
121
122 static void
lnet_destroy_remote_nets_table(void)123 lnet_destroy_remote_nets_table(void)
124 {
125 int i;
126
127 if (!the_lnet.ln_remote_nets_hash)
128 return;
129
130 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
131 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
132
133 LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
134 LNET_REMOTE_NETS_HASH_SIZE *
135 sizeof(the_lnet.ln_remote_nets_hash[0]));
136 the_lnet.ln_remote_nets_hash = NULL;
137 }
138
139 static void
lnet_destroy_locks(void)140 lnet_destroy_locks(void)
141 {
142 if (the_lnet.ln_res_lock) {
143 cfs_percpt_lock_free(the_lnet.ln_res_lock);
144 the_lnet.ln_res_lock = NULL;
145 }
146
147 if (the_lnet.ln_net_lock) {
148 cfs_percpt_lock_free(the_lnet.ln_net_lock);
149 the_lnet.ln_net_lock = NULL;
150 }
151 }
152
153 static int
lnet_create_locks(void)154 lnet_create_locks(void)
155 {
156 lnet_init_locks();
157
158 the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
159 if (!the_lnet.ln_res_lock)
160 goto failed;
161
162 the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
163 if (!the_lnet.ln_net_lock)
164 goto failed;
165
166 return 0;
167
168 failed:
169 lnet_destroy_locks();
170 return -ENOMEM;
171 }
172
lnet_assert_wire_constants(void)173 static void lnet_assert_wire_constants(void)
174 {
175 /*
176 * Wire protocol assertions generated by 'wirecheck'
177 * running on Linux robert.bartonsoftware.com 2.6.8-1.521
178 * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
179 * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7)
180 */
181
182 /* Constants... */
183 BUILD_BUG_ON(LNET_PROTO_TCP_MAGIC != 0xeebc0ded);
184 BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MAJOR != 1);
185 BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MINOR != 0);
186 BUILD_BUG_ON(LNET_MSG_ACK != 0);
187 BUILD_BUG_ON(LNET_MSG_PUT != 1);
188 BUILD_BUG_ON(LNET_MSG_GET != 2);
189 BUILD_BUG_ON(LNET_MSG_REPLY != 3);
190 BUILD_BUG_ON(LNET_MSG_HELLO != 4);
191
192 /* Checks for struct ptl_handle_wire_t */
193 BUILD_BUG_ON((int)sizeof(struct lnet_handle_wire) != 16);
194 BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire, wh_interface_cookie) != 0);
195 BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) != 8);
196 BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire, wh_object_cookie) != 8);
197 BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) != 8);
198
199 /* Checks for struct struct lnet_magicversion */
200 BUILD_BUG_ON((int)sizeof(struct lnet_magicversion) != 8);
201 BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, magic) != 0);
202 BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->magic) != 4);
203 BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_major) != 4);
204 BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_major) != 2);
205 BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_minor) != 6);
206 BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_minor) != 2);
207
208 /* Checks for struct struct lnet_hdr */
209 BUILD_BUG_ON((int)sizeof(struct lnet_hdr) != 72);
210 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_nid) != 0);
211 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_nid) != 8);
212 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_nid) != 8);
213 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_nid) != 8);
214 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_pid) != 16);
215 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_pid) != 4);
216 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_pid) != 20);
217 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_pid) != 4);
218 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, type) != 24);
219 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->type) != 4);
220 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, payload_length) != 28);
221 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->payload_length) != 4);
222 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg) != 32);
223 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg) != 40);
224
225 /* Ack */
226 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) != 32);
227 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) != 16);
228 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.match_bits) != 48);
229 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) != 8);
230 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.mlength) != 56);
231 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) != 4);
232
233 /* Put */
234 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) != 32);
235 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) != 16);
236 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.match_bits) != 48);
237 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) != 8);
238 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.hdr_data) != 56);
239 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) != 8);
240 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ptl_index) != 64);
241 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) != 4);
242 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.offset) != 68);
243 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) != 4);
244
245 /* Get */
246 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.return_wmd) != 32);
247 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) != 16);
248 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.match_bits) != 48);
249 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) != 8);
250 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.ptl_index) != 56);
251 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) != 4);
252 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.src_offset) != 60);
253 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) != 4);
254 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.sink_length) != 64);
255 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) != 4);
256
257 /* Reply */
258 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) != 32);
259 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) != 16);
260
261 /* Hello */
262 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.incarnation) != 32);
263 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) != 8);
264 BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.type) != 40);
265 BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) != 4);
266 }
267
268 static struct lnet_lnd *
lnet_find_lnd_by_type(__u32 type)269 lnet_find_lnd_by_type(__u32 type)
270 {
271 struct lnet_lnd *lnd;
272 struct list_head *tmp;
273
274 /* holding lnd mutex */
275 list_for_each(tmp, &the_lnet.ln_lnds) {
276 lnd = list_entry(tmp, struct lnet_lnd, lnd_list);
277
278 if (lnd->lnd_type == type)
279 return lnd;
280 }
281
282 return NULL;
283 }
284
285 void
lnet_register_lnd(struct lnet_lnd * lnd)286 lnet_register_lnd(struct lnet_lnd *lnd)
287 {
288 mutex_lock(&the_lnet.ln_lnd_mutex);
289
290 LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
291 LASSERT(!lnet_find_lnd_by_type(lnd->lnd_type));
292
293 list_add_tail(&lnd->lnd_list, &the_lnet.ln_lnds);
294 lnd->lnd_refcount = 0;
295
296 CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
297
298 mutex_unlock(&the_lnet.ln_lnd_mutex);
299 }
300 EXPORT_SYMBOL(lnet_register_lnd);
301
302 void
lnet_unregister_lnd(struct lnet_lnd * lnd)303 lnet_unregister_lnd(struct lnet_lnd *lnd)
304 {
305 mutex_lock(&the_lnet.ln_lnd_mutex);
306
307 LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
308 LASSERT(!lnd->lnd_refcount);
309
310 list_del(&lnd->lnd_list);
311 CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
312
313 mutex_unlock(&the_lnet.ln_lnd_mutex);
314 }
315 EXPORT_SYMBOL(lnet_unregister_lnd);
316
317 void
lnet_counters_get(struct lnet_counters * counters)318 lnet_counters_get(struct lnet_counters *counters)
319 {
320 struct lnet_counters *ctr;
321 int i;
322
323 memset(counters, 0, sizeof(*counters));
324
325 lnet_net_lock(LNET_LOCK_EX);
326
327 cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
328 counters->msgs_max += ctr->msgs_max;
329 counters->msgs_alloc += ctr->msgs_alloc;
330 counters->errors += ctr->errors;
331 counters->send_count += ctr->send_count;
332 counters->recv_count += ctr->recv_count;
333 counters->route_count += ctr->route_count;
334 counters->drop_count += ctr->drop_count;
335 counters->send_length += ctr->send_length;
336 counters->recv_length += ctr->recv_length;
337 counters->route_length += ctr->route_length;
338 counters->drop_length += ctr->drop_length;
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 struct lnet_counters *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(struct lnet_counters));
354
355 lnet_net_unlock(LNET_LOCK_EX);
356 }
357
358 static char *
lnet_res_type2str(int type)359 lnet_res_type2str(int type)
360 {
361 switch (type) {
362 default:
363 LBUG();
364 case LNET_COOKIE_TYPE_MD:
365 return "MD";
366 case LNET_COOKIE_TYPE_ME:
367 return "ME";
368 case LNET_COOKIE_TYPE_EQ:
369 return "EQ";
370 }
371 }
372
373 static void
lnet_res_container_cleanup(struct lnet_res_container * rec)374 lnet_res_container_cleanup(struct lnet_res_container *rec)
375 {
376 int count = 0;
377
378 if (!rec->rec_type) /* not set yet, it's uninitialized */
379 return;
380
381 while (!list_empty(&rec->rec_active)) {
382 struct list_head *e = rec->rec_active.next;
383
384 list_del_init(e);
385 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
386 lnet_eq_free(list_entry(e, struct lnet_eq, eq_list));
387
388 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
389 lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
390
391 } else { /* NB: Active MEs should be attached on portals */
392 LBUG();
393 }
394 count++;
395 }
396
397 if (count > 0) {
398 /*
399 * Found alive MD/ME/EQ, user really should unlink/free
400 * all of them before finalize LNet, but if someone didn't,
401 * we have to recycle garbage for him
402 */
403 CERROR("%d active elements on exit of %s container\n",
404 count, lnet_res_type2str(rec->rec_type));
405 }
406
407 if (rec->rec_lh_hash) {
408 LIBCFS_FREE(rec->rec_lh_hash,
409 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
410 rec->rec_lh_hash = NULL;
411 }
412
413 rec->rec_type = 0; /* mark it as finalized */
414 }
415
416 static int
lnet_res_container_setup(struct lnet_res_container * rec,int cpt,int type)417 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
418 {
419 int rc = 0;
420 int i;
421
422 LASSERT(!rec->rec_type);
423
424 rec->rec_type = type;
425 INIT_LIST_HEAD(&rec->rec_active);
426 rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
427
428 /* Arbitrary choice of hash table size */
429 LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
430 LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
431 if (!rec->rec_lh_hash) {
432 rc = -ENOMEM;
433 goto out;
434 }
435
436 for (i = 0; i < LNET_LH_HASH_SIZE; i++)
437 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
438
439 return 0;
440
441 out:
442 CERROR("Failed to setup %s resource container\n",
443 lnet_res_type2str(type));
444 lnet_res_container_cleanup(rec);
445 return rc;
446 }
447
448 static void
lnet_res_containers_destroy(struct lnet_res_container ** recs)449 lnet_res_containers_destroy(struct lnet_res_container **recs)
450 {
451 struct lnet_res_container *rec;
452 int i;
453
454 cfs_percpt_for_each(rec, i, recs)
455 lnet_res_container_cleanup(rec);
456
457 cfs_percpt_free(recs);
458 }
459
460 static struct lnet_res_container **
lnet_res_containers_create(int type)461 lnet_res_containers_create(int type)
462 {
463 struct lnet_res_container **recs;
464 struct lnet_res_container *rec;
465 int rc;
466 int i;
467
468 recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
469 if (!recs) {
470 CERROR("Failed to allocate %s resource containers\n",
471 lnet_res_type2str(type));
472 return NULL;
473 }
474
475 cfs_percpt_for_each(rec, i, recs) {
476 rc = lnet_res_container_setup(rec, i, type);
477 if (rc) {
478 lnet_res_containers_destroy(recs);
479 return NULL;
480 }
481 }
482
483 return recs;
484 }
485
486 struct lnet_libhandle *
lnet_res_lh_lookup(struct lnet_res_container * rec,__u64 cookie)487 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
488 {
489 /* ALWAYS called with lnet_res_lock held */
490 struct list_head *head;
491 struct lnet_libhandle *lh;
492 unsigned int hash;
493
494 if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
495 return NULL;
496
497 hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
498 head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
499
500 list_for_each_entry(lh, head, lh_hash_chain) {
501 if (lh->lh_cookie == cookie)
502 return lh;
503 }
504
505 return NULL;
506 }
507
508 void
lnet_res_lh_initialize(struct lnet_res_container * rec,struct lnet_libhandle * lh)509 lnet_res_lh_initialize(struct lnet_res_container *rec,
510 struct lnet_libhandle *lh)
511 {
512 /* ALWAYS called with lnet_res_lock held */
513 unsigned int ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
514 unsigned int hash;
515
516 lh->lh_cookie = rec->rec_lh_cookie;
517 rec->rec_lh_cookie += 1 << ibits;
518
519 hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
520
521 list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
522 }
523
524 static int lnet_unprepare(void);
525
526 static int
lnet_prepare(lnet_pid_t requested_pid)527 lnet_prepare(lnet_pid_t requested_pid)
528 {
529 /* Prepare to bring up the network */
530 struct lnet_res_container **recs;
531 int rc = 0;
532
533 if (requested_pid == LNET_PID_ANY) {
534 /* Don't instantiate LNET just for me */
535 return -ENETDOWN;
536 }
537
538 LASSERT(!the_lnet.ln_refcount);
539
540 the_lnet.ln_routing = 0;
541
542 LASSERT(!(requested_pid & LNET_PID_USERFLAG));
543 the_lnet.ln_pid = requested_pid;
544
545 INIT_LIST_HEAD(&the_lnet.ln_test_peers);
546 INIT_LIST_HEAD(&the_lnet.ln_nis);
547 INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
548 INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
549 INIT_LIST_HEAD(&the_lnet.ln_routers);
550 INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
551 INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
552
553 rc = lnet_create_remote_nets_table();
554 if (rc)
555 goto failed;
556 /*
557 * NB the interface cookie in wire handles guards against delayed
558 * replies and ACKs appearing valid after reboot.
559 */
560 the_lnet.ln_interface_cookie = ktime_get_ns();
561
562 the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
563 sizeof(struct lnet_counters));
564 if (!the_lnet.ln_counters) {
565 CERROR("Failed to allocate counters for LNet\n");
566 rc = -ENOMEM;
567 goto failed;
568 }
569
570 rc = lnet_peer_tables_create();
571 if (rc)
572 goto failed;
573
574 rc = lnet_msg_containers_create();
575 if (rc)
576 goto failed;
577
578 rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
579 LNET_COOKIE_TYPE_EQ);
580 if (rc)
581 goto failed;
582
583 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME);
584 if (!recs) {
585 rc = -ENOMEM;
586 goto failed;
587 }
588
589 the_lnet.ln_me_containers = recs;
590
591 recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
592 if (!recs) {
593 rc = -ENOMEM;
594 goto failed;
595 }
596
597 the_lnet.ln_md_containers = recs;
598
599 rc = lnet_portals_create();
600 if (rc) {
601 CERROR("Failed to create portals for LNet: %d\n", rc);
602 goto failed;
603 }
604
605 return 0;
606
607 failed:
608 lnet_unprepare();
609 return rc;
610 }
611
612 static int
lnet_unprepare(void)613 lnet_unprepare(void)
614 {
615 /*
616 * NB no LNET_LOCK since this is the last reference. All LND instances
617 * have shut down already, so it is safe to unlink and free all
618 * descriptors, even those that appear committed to a network op (eg MD
619 * with non-zero pending count)
620 */
621 lnet_fail_nid(LNET_NID_ANY, 0);
622
623 LASSERT(!the_lnet.ln_refcount);
624 LASSERT(list_empty(&the_lnet.ln_test_peers));
625 LASSERT(list_empty(&the_lnet.ln_nis));
626 LASSERT(list_empty(&the_lnet.ln_nis_cpt));
627 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
628
629 lnet_portals_destroy();
630
631 if (the_lnet.ln_md_containers) {
632 lnet_res_containers_destroy(the_lnet.ln_md_containers);
633 the_lnet.ln_md_containers = NULL;
634 }
635
636 if (the_lnet.ln_me_containers) {
637 lnet_res_containers_destroy(the_lnet.ln_me_containers);
638 the_lnet.ln_me_containers = NULL;
639 }
640
641 lnet_res_container_cleanup(&the_lnet.ln_eq_container);
642
643 lnet_msg_containers_destroy();
644 lnet_peer_tables_destroy();
645 lnet_rtrpools_free(0);
646
647 if (the_lnet.ln_counters) {
648 cfs_percpt_free(the_lnet.ln_counters);
649 the_lnet.ln_counters = NULL;
650 }
651 lnet_destroy_remote_nets_table();
652
653 return 0;
654 }
655
656 struct lnet_ni *
lnet_net2ni_locked(__u32 net,int cpt)657 lnet_net2ni_locked(__u32 net, int cpt)
658 {
659 struct list_head *tmp;
660 struct lnet_ni *ni;
661
662 LASSERT(cpt != LNET_LOCK_EX);
663
664 list_for_each(tmp, &the_lnet.ln_nis) {
665 ni = list_entry(tmp, struct lnet_ni, ni_list);
666
667 if (LNET_NIDNET(ni->ni_nid) == net) {
668 lnet_ni_addref_locked(ni, cpt);
669 return ni;
670 }
671 }
672
673 return NULL;
674 }
675
676 struct lnet_ni *
lnet_net2ni(__u32 net)677 lnet_net2ni(__u32 net)
678 {
679 struct lnet_ni *ni;
680
681 lnet_net_lock(0);
682 ni = lnet_net2ni_locked(net, 0);
683 lnet_net_unlock(0);
684
685 return ni;
686 }
687 EXPORT_SYMBOL(lnet_net2ni);
688
689 static unsigned int
lnet_nid_cpt_hash(lnet_nid_t nid,unsigned int number)690 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
691 {
692 __u64 key = nid;
693 unsigned int val;
694
695 LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
696
697 if (number == 1)
698 return 0;
699
700 val = hash_long(key, LNET_CPT_BITS);
701 /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
702 if (val < number)
703 return val;
704
705 return (unsigned int)(key + val + (val >> 1)) % number;
706 }
707
708 int
lnet_cpt_of_nid_locked(lnet_nid_t nid)709 lnet_cpt_of_nid_locked(lnet_nid_t nid)
710 {
711 struct lnet_ni *ni;
712
713 /* must called with hold of lnet_net_lock */
714 if (LNET_CPT_NUMBER == 1)
715 return 0; /* the only one */
716
717 /* take lnet_net_lock(any) would be OK */
718 if (!list_empty(&the_lnet.ln_nis_cpt)) {
719 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
720 if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
721 continue;
722
723 LASSERT(ni->ni_cpts);
724 return ni->ni_cpts[lnet_nid_cpt_hash
725 (nid, ni->ni_ncpts)];
726 }
727 }
728
729 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
730 }
731
732 int
lnet_cpt_of_nid(lnet_nid_t nid)733 lnet_cpt_of_nid(lnet_nid_t nid)
734 {
735 int cpt;
736 int cpt2;
737
738 if (LNET_CPT_NUMBER == 1)
739 return 0; /* the only one */
740
741 if (list_empty(&the_lnet.ln_nis_cpt))
742 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
743
744 cpt = lnet_net_lock_current();
745 cpt2 = lnet_cpt_of_nid_locked(nid);
746 lnet_net_unlock(cpt);
747
748 return cpt2;
749 }
750 EXPORT_SYMBOL(lnet_cpt_of_nid);
751
752 int
lnet_islocalnet(__u32 net)753 lnet_islocalnet(__u32 net)
754 {
755 struct lnet_ni *ni;
756 int cpt;
757
758 cpt = lnet_net_lock_current();
759
760 ni = lnet_net2ni_locked(net, cpt);
761 if (ni)
762 lnet_ni_decref_locked(ni, cpt);
763
764 lnet_net_unlock(cpt);
765
766 return !!ni;
767 }
768
769 struct lnet_ni *
lnet_nid2ni_locked(lnet_nid_t nid,int cpt)770 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
771 {
772 struct lnet_ni *ni;
773 struct list_head *tmp;
774
775 LASSERT(cpt != LNET_LOCK_EX);
776
777 list_for_each(tmp, &the_lnet.ln_nis) {
778 ni = list_entry(tmp, struct lnet_ni, ni_list);
779
780 if (ni->ni_nid == nid) {
781 lnet_ni_addref_locked(ni, cpt);
782 return ni;
783 }
784 }
785
786 return NULL;
787 }
788
789 int
lnet_islocalnid(lnet_nid_t nid)790 lnet_islocalnid(lnet_nid_t nid)
791 {
792 struct lnet_ni *ni;
793 int cpt;
794
795 cpt = lnet_net_lock_current();
796 ni = lnet_nid2ni_locked(nid, cpt);
797 if (ni)
798 lnet_ni_decref_locked(ni, cpt);
799 lnet_net_unlock(cpt);
800
801 return !!ni;
802 }
803
804 int
lnet_count_acceptor_nis(void)805 lnet_count_acceptor_nis(void)
806 {
807 /* Return the # of NIs that need the acceptor. */
808 int count = 0;
809 struct list_head *tmp;
810 struct lnet_ni *ni;
811 int cpt;
812
813 cpt = lnet_net_lock_current();
814 list_for_each(tmp, &the_lnet.ln_nis) {
815 ni = list_entry(tmp, struct lnet_ni, ni_list);
816
817 if (ni->ni_lnd->lnd_accept)
818 count++;
819 }
820
821 lnet_net_unlock(cpt);
822
823 return count;
824 }
825
826 static struct lnet_ping_info *
lnet_ping_info_create(int num_ni)827 lnet_ping_info_create(int num_ni)
828 {
829 struct lnet_ping_info *ping_info;
830 unsigned int infosz;
831
832 infosz = offsetof(struct lnet_ping_info, pi_ni[num_ni]);
833 LIBCFS_ALLOC(ping_info, infosz);
834 if (!ping_info) {
835 CERROR("Can't allocate ping info[%d]\n", num_ni);
836 return NULL;
837 }
838
839 ping_info->pi_nnis = num_ni;
840 ping_info->pi_pid = the_lnet.ln_pid;
841 ping_info->pi_magic = LNET_PROTO_PING_MAGIC;
842 ping_info->pi_features = LNET_PING_FEAT_NI_STATUS;
843
844 return ping_info;
845 }
846
847 static inline int
lnet_get_ni_count(void)848 lnet_get_ni_count(void)
849 {
850 struct lnet_ni *ni;
851 int count = 0;
852
853 lnet_net_lock(0);
854
855 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list)
856 count++;
857
858 lnet_net_unlock(0);
859
860 return count;
861 }
862
863 static inline void
lnet_ping_info_free(struct lnet_ping_info * pinfo)864 lnet_ping_info_free(struct lnet_ping_info *pinfo)
865 {
866 LIBCFS_FREE(pinfo,
867 offsetof(struct lnet_ping_info,
868 pi_ni[pinfo->pi_nnis]));
869 }
870
871 static void
lnet_ping_info_destroy(void)872 lnet_ping_info_destroy(void)
873 {
874 struct lnet_ni *ni;
875
876 lnet_net_lock(LNET_LOCK_EX);
877
878 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
879 lnet_ni_lock(ni);
880 ni->ni_status = NULL;
881 lnet_ni_unlock(ni);
882 }
883
884 lnet_ping_info_free(the_lnet.ln_ping_info);
885 the_lnet.ln_ping_info = NULL;
886
887 lnet_net_unlock(LNET_LOCK_EX);
888 }
889
890 static void
lnet_ping_event_handler(struct lnet_event * event)891 lnet_ping_event_handler(struct lnet_event *event)
892 {
893 struct lnet_ping_info *pinfo = event->md.user_ptr;
894
895 if (event->unlinked)
896 pinfo->pi_features = LNET_PING_FEAT_INVAL;
897 }
898
899 static int
lnet_ping_info_setup(struct lnet_ping_info ** ppinfo,struct lnet_handle_md * md_handle,int ni_count,bool set_eq)900 lnet_ping_info_setup(struct lnet_ping_info **ppinfo,
901 struct lnet_handle_md *md_handle,
902 int ni_count, bool set_eq)
903 {
904 struct lnet_process_id id = {LNET_NID_ANY, LNET_PID_ANY};
905 struct lnet_handle_me me_handle;
906 struct lnet_md md = { NULL };
907 int rc, rc2;
908
909 if (set_eq) {
910 rc = LNetEQAlloc(0, lnet_ping_event_handler,
911 &the_lnet.ln_ping_target_eq);
912 if (rc) {
913 CERROR("Can't allocate ping EQ: %d\n", rc);
914 return rc;
915 }
916 }
917
918 *ppinfo = lnet_ping_info_create(ni_count);
919 if (!*ppinfo) {
920 rc = -ENOMEM;
921 goto failed_0;
922 }
923
924 rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
925 LNET_PROTO_PING_MATCHBITS, 0,
926 LNET_UNLINK, LNET_INS_AFTER,
927 &me_handle);
928 if (rc) {
929 CERROR("Can't create ping ME: %d\n", rc);
930 goto failed_1;
931 }
932
933 /* initialize md content */
934 md.start = *ppinfo;
935 md.length = offsetof(struct lnet_ping_info,
936 pi_ni[(*ppinfo)->pi_nnis]);
937 md.threshold = LNET_MD_THRESH_INF;
938 md.max_size = 0;
939 md.options = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
940 LNET_MD_MANAGE_REMOTE;
941 md.user_ptr = NULL;
942 md.eq_handle = the_lnet.ln_ping_target_eq;
943 md.user_ptr = *ppinfo;
944
945 rc = LNetMDAttach(me_handle, md, LNET_RETAIN, md_handle);
946 if (rc) {
947 CERROR("Can't attach ping MD: %d\n", rc);
948 goto failed_2;
949 }
950
951 return 0;
952
953 failed_2:
954 rc2 = LNetMEUnlink(me_handle);
955 LASSERT(!rc2);
956 failed_1:
957 lnet_ping_info_free(*ppinfo);
958 *ppinfo = NULL;
959 failed_0:
960 if (set_eq)
961 LNetEQFree(the_lnet.ln_ping_target_eq);
962 return rc;
963 }
964
965 static void
lnet_ping_md_unlink(struct lnet_ping_info * pinfo,struct lnet_handle_md * md_handle)966 lnet_ping_md_unlink(struct lnet_ping_info *pinfo,
967 struct lnet_handle_md *md_handle)
968 {
969 sigset_t blocked = cfs_block_allsigs();
970
971 LNetMDUnlink(*md_handle);
972 LNetInvalidateMDHandle(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
lnet_ping_info_install_locked(struct lnet_ping_info * ping_info)985 lnet_ping_info_install_locked(struct lnet_ping_info *ping_info)
986 {
987 struct lnet_ni_status *ns;
988 struct lnet_ni *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
lnet_ping_target_update(struct lnet_ping_info * pinfo,struct lnet_handle_md md_handle)1009 lnet_ping_target_update(struct lnet_ping_info *pinfo,
1010 struct lnet_handle_md md_handle)
1011 {
1012 struct lnet_ping_info *old_pinfo = NULL;
1013 struct lnet_handle_md old_md;
1014
1015 /* switch the NIs to point to the new ping info created */
1016 lnet_net_lock(LNET_LOCK_EX);
1017
1018 if (!the_lnet.ln_routing)
1019 pinfo->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1020 lnet_ping_info_install_locked(pinfo);
1021
1022 if (the_lnet.ln_ping_info) {
1023 old_pinfo = the_lnet.ln_ping_info;
1024 old_md = the_lnet.ln_ping_target_md;
1025 }
1026 the_lnet.ln_ping_target_md = md_handle;
1027 the_lnet.ln_ping_info = pinfo;
1028
1029 lnet_net_unlock(LNET_LOCK_EX);
1030
1031 if (old_pinfo) {
1032 /* unlink the old ping info */
1033 lnet_ping_md_unlink(old_pinfo, &old_md);
1034 lnet_ping_info_free(old_pinfo);
1035 }
1036 }
1037
1038 static void
lnet_ping_target_fini(void)1039 lnet_ping_target_fini(void)
1040 {
1041 int rc;
1042
1043 lnet_ping_md_unlink(the_lnet.ln_ping_info,
1044 &the_lnet.ln_ping_target_md);
1045
1046 rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1047 LASSERT(!rc);
1048
1049 lnet_ping_info_destroy();
1050 }
1051
1052 static int
lnet_ni_tq_credits(struct lnet_ni * ni)1053 lnet_ni_tq_credits(struct lnet_ni *ni)
1054 {
1055 int credits;
1056
1057 LASSERT(ni->ni_ncpts >= 1);
1058
1059 if (ni->ni_ncpts == 1)
1060 return ni->ni_maxtxcredits;
1061
1062 credits = ni->ni_maxtxcredits / ni->ni_ncpts;
1063 credits = max(credits, 8 * ni->ni_peertxcredits);
1064 credits = min(credits, ni->ni_maxtxcredits);
1065
1066 return credits;
1067 }
1068
1069 static void
lnet_ni_unlink_locked(struct lnet_ni * ni)1070 lnet_ni_unlink_locked(struct lnet_ni *ni)
1071 {
1072 if (!list_empty(&ni->ni_cptlist)) {
1073 list_del_init(&ni->ni_cptlist);
1074 lnet_ni_decref_locked(ni, 0);
1075 }
1076
1077 /* move it to zombie list and nobody can find it anymore */
1078 LASSERT(!list_empty(&ni->ni_list));
1079 list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
1080 lnet_ni_decref_locked(ni, 0); /* drop ln_nis' ref */
1081 }
1082
1083 static void
lnet_clear_zombies_nis_locked(void)1084 lnet_clear_zombies_nis_locked(void)
1085 {
1086 int i;
1087 int islo;
1088 struct lnet_ni *ni;
1089 struct lnet_ni *temp;
1090
1091 /*
1092 * Now wait for the NI's I just nuked to show up on ln_zombie_nis
1093 * and shut them down in guaranteed thread context
1094 */
1095 i = 2;
1096 list_for_each_entry_safe(ni, temp, &the_lnet.ln_nis_zombie, ni_list) {
1097 int *ref;
1098 int j;
1099
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
lnet_shutdown_lndnis(void)1146 lnet_shutdown_lndnis(void)
1147 {
1148 struct lnet_ni *ni;
1149 struct lnet_ni *temp;
1150 int i;
1151
1152 /* NB called holding the global mutex */
1153
1154 /* All quiet on the API front */
1155 LASSERT(!the_lnet.ln_shutdown);
1156 LASSERT(!the_lnet.ln_refcount);
1157 LASSERT(list_empty(&the_lnet.ln_nis_zombie));
1158
1159 lnet_net_lock(LNET_LOCK_EX);
1160 the_lnet.ln_shutdown = 1; /* flag shutdown */
1161
1162 /* Unlink NIs from the global table */
1163 list_for_each_entry_safe(ni, temp, &the_lnet.ln_nis, ni_list) {
1164 lnet_ni_unlink_locked(ni);
1165 }
1166
1167 /* Drop the cached loopback NI. */
1168 if (the_lnet.ln_loni) {
1169 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
1170 the_lnet.ln_loni = NULL;
1171 }
1172
1173 lnet_net_unlock(LNET_LOCK_EX);
1174
1175 /*
1176 * Clear lazy portals and drop delayed messages which hold refs
1177 * on their lnet_msg::msg_rxpeer
1178 */
1179 for (i = 0; i < the_lnet.ln_nportals; i++)
1180 LNetClearLazyPortal(i);
1181
1182 /*
1183 * Clear the peer table and wait for all peers to go (they hold refs on
1184 * their NIs)
1185 */
1186 lnet_peer_tables_cleanup(NULL);
1187
1188 lnet_net_lock(LNET_LOCK_EX);
1189
1190 lnet_clear_zombies_nis_locked();
1191 the_lnet.ln_shutdown = 0;
1192 lnet_net_unlock(LNET_LOCK_EX);
1193 }
1194
1195 /* shutdown down the NI and release refcount */
1196 static void
lnet_shutdown_lndni(struct lnet_ni * ni)1197 lnet_shutdown_lndni(struct lnet_ni *ni)
1198 {
1199 int i;
1200
1201 lnet_net_lock(LNET_LOCK_EX);
1202 lnet_ni_unlink_locked(ni);
1203 lnet_net_unlock(LNET_LOCK_EX);
1204
1205 /* clear messages for this NI on the lazy portal */
1206 for (i = 0; i < the_lnet.ln_nportals; i++)
1207 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
1208
1209 /* Do peer table cleanup for this ni */
1210 lnet_peer_tables_cleanup(ni);
1211
1212 lnet_net_lock(LNET_LOCK_EX);
1213 lnet_clear_zombies_nis_locked();
1214 lnet_net_unlock(LNET_LOCK_EX);
1215 }
1216
1217 static int
lnet_startup_lndni(struct lnet_ni * ni,struct lnet_ioctl_config_data * conf)1218 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_ioctl_config_data *conf)
1219 {
1220 struct lnet_ioctl_config_lnd_tunables *lnd_tunables = NULL;
1221 int rc = -EINVAL;
1222 int lnd_type;
1223 struct lnet_lnd *lnd;
1224 struct lnet_tx_queue *tq;
1225 int i;
1226
1227 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1228
1229 LASSERT(libcfs_isknown_lnd(lnd_type));
1230
1231 if (lnd_type == CIBLND || lnd_type == OPENIBLND ||
1232 lnd_type == IIBLND || lnd_type == VIBLND) {
1233 CERROR("LND %s obsoleted\n", libcfs_lnd2str(lnd_type));
1234 goto failed0;
1235 }
1236
1237 /* Make sure this new NI is unique. */
1238 lnet_net_lock(LNET_LOCK_EX);
1239 rc = lnet_net_unique(LNET_NIDNET(ni->ni_nid), &the_lnet.ln_nis);
1240 lnet_net_unlock(LNET_LOCK_EX);
1241 if (!rc) {
1242 if (lnd_type == LOLND) {
1243 lnet_ni_free(ni);
1244 return 0;
1245 }
1246
1247 CERROR("Net %s is not unique\n",
1248 libcfs_net2str(LNET_NIDNET(ni->ni_nid)));
1249 rc = -EEXIST;
1250 goto failed0;
1251 }
1252
1253 mutex_lock(&the_lnet.ln_lnd_mutex);
1254 lnd = lnet_find_lnd_by_type(lnd_type);
1255
1256 if (!lnd) {
1257 mutex_unlock(&the_lnet.ln_lnd_mutex);
1258 rc = request_module("%s", libcfs_lnd2modname(lnd_type));
1259 mutex_lock(&the_lnet.ln_lnd_mutex);
1260
1261 lnd = lnet_find_lnd_by_type(lnd_type);
1262 if (!lnd) {
1263 mutex_unlock(&the_lnet.ln_lnd_mutex);
1264 CERROR("Can't load LND %s, module %s, rc=%d\n",
1265 libcfs_lnd2str(lnd_type),
1266 libcfs_lnd2modname(lnd_type), rc);
1267 rc = -EINVAL;
1268 goto failed0;
1269 }
1270 }
1271
1272 lnet_net_lock(LNET_LOCK_EX);
1273 lnd->lnd_refcount++;
1274 lnet_net_unlock(LNET_LOCK_EX);
1275
1276 ni->ni_lnd = lnd;
1277
1278 if (conf && conf->cfg_hdr.ioc_len > sizeof(*conf))
1279 lnd_tunables = (struct lnet_ioctl_config_lnd_tunables *)conf->cfg_bulk;
1280
1281 if (lnd_tunables) {
1282 LIBCFS_ALLOC(ni->ni_lnd_tunables,
1283 sizeof(*ni->ni_lnd_tunables));
1284 if (!ni->ni_lnd_tunables) {
1285 mutex_unlock(&the_lnet.ln_lnd_mutex);
1286 rc = -ENOMEM;
1287 goto failed0;
1288 }
1289 memcpy(ni->ni_lnd_tunables, lnd_tunables,
1290 sizeof(*ni->ni_lnd_tunables));
1291 }
1292
1293 /*
1294 * If given some LND tunable parameters, parse those now to
1295 * override the values in the NI structure.
1296 */
1297 if (conf) {
1298 if (conf->cfg_config_u.cfg_net.net_peer_rtr_credits >= 0)
1299 ni->ni_peerrtrcredits =
1300 conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
1301 if (conf->cfg_config_u.cfg_net.net_peer_timeout >= 0)
1302 ni->ni_peertimeout =
1303 conf->cfg_config_u.cfg_net.net_peer_timeout;
1304 if (conf->cfg_config_u.cfg_net.net_peer_tx_credits != -1)
1305 ni->ni_peertxcredits =
1306 conf->cfg_config_u.cfg_net.net_peer_tx_credits;
1307 if (conf->cfg_config_u.cfg_net.net_max_tx_credits >= 0)
1308 ni->ni_maxtxcredits =
1309 conf->cfg_config_u.cfg_net.net_max_tx_credits;
1310 }
1311
1312 rc = lnd->lnd_startup(ni);
1313
1314 mutex_unlock(&the_lnet.ln_lnd_mutex);
1315
1316 if (rc) {
1317 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
1318 rc, libcfs_lnd2str(lnd->lnd_type));
1319 lnet_net_lock(LNET_LOCK_EX);
1320 lnd->lnd_refcount--;
1321 lnet_net_unlock(LNET_LOCK_EX);
1322 goto failed0;
1323 }
1324
1325 LASSERT(ni->ni_peertimeout <= 0 || lnd->lnd_query);
1326
1327 lnet_net_lock(LNET_LOCK_EX);
1328 /* refcount for ln_nis */
1329 lnet_ni_addref_locked(ni, 0);
1330 list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1331 if (ni->ni_cpts) {
1332 lnet_ni_addref_locked(ni, 0);
1333 list_add_tail(&ni->ni_cptlist, &the_lnet.ln_nis_cpt);
1334 }
1335
1336 lnet_net_unlock(LNET_LOCK_EX);
1337
1338 if (lnd->lnd_type == LOLND) {
1339 lnet_ni_addref(ni);
1340 LASSERT(!the_lnet.ln_loni);
1341 the_lnet.ln_loni = ni;
1342 return 0;
1343 }
1344
1345 if (!ni->ni_peertxcredits || !ni->ni_maxtxcredits) {
1346 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1347 libcfs_lnd2str(lnd->lnd_type),
1348 !ni->ni_peertxcredits ?
1349 "" : "per-peer ");
1350 /*
1351 * shutdown the NI since if we get here then it must've already
1352 * been started
1353 */
1354 lnet_shutdown_lndni(ni);
1355 return -EINVAL;
1356 }
1357
1358 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1359 tq->tq_credits_min =
1360 tq->tq_credits_max =
1361 tq->tq_credits = lnet_ni_tq_credits(ni);
1362 }
1363
1364 CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1365 libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1366 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1367 ni->ni_peerrtrcredits, ni->ni_peertimeout);
1368
1369 return 0;
1370 failed0:
1371 lnet_ni_free(ni);
1372 return rc;
1373 }
1374
1375 static int
lnet_startup_lndnis(struct list_head * nilist)1376 lnet_startup_lndnis(struct list_head *nilist)
1377 {
1378 struct lnet_ni *ni;
1379 int rc;
1380 int ni_count = 0;
1381
1382 while (!list_empty(nilist)) {
1383 ni = list_entry(nilist->next, struct lnet_ni, ni_list);
1384 list_del(&ni->ni_list);
1385 rc = lnet_startup_lndni(ni, NULL);
1386
1387 if (rc < 0)
1388 goto failed;
1389
1390 ni_count++;
1391 }
1392
1393 return ni_count;
1394 failed:
1395 lnet_shutdown_lndnis();
1396
1397 return rc;
1398 }
1399
1400 /**
1401 * Initialize LNet library.
1402 *
1403 * Automatically called at module loading time. Caller has to call
1404 * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
1405 * latter returned 0. It must be called exactly once.
1406 *
1407 * \retval 0 on success
1408 * \retval -ve on failures.
1409 */
lnet_lib_init(void)1410 int lnet_lib_init(void)
1411 {
1412 int rc;
1413
1414 lnet_assert_wire_constants();
1415
1416 memset(&the_lnet, 0, sizeof(the_lnet));
1417
1418 /* refer to global cfs_cpt_table for now */
1419 the_lnet.ln_cpt_table = cfs_cpt_table;
1420 the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_table);
1421
1422 LASSERT(the_lnet.ln_cpt_number > 0);
1423 if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1424 /* we are under risk of consuming all lh_cookie */
1425 CERROR("Can't have %d CPTs for LNet (max allowed is %d), please change setting of CPT-table and retry\n",
1426 the_lnet.ln_cpt_number, LNET_CPT_MAX);
1427 return -E2BIG;
1428 }
1429
1430 while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1431 the_lnet.ln_cpt_bits++;
1432
1433 rc = lnet_create_locks();
1434 if (rc) {
1435 CERROR("Can't create LNet global locks: %d\n", rc);
1436 return rc;
1437 }
1438
1439 the_lnet.ln_refcount = 0;
1440 LNetInvalidateEQHandle(&the_lnet.ln_rc_eqh);
1441 INIT_LIST_HEAD(&the_lnet.ln_lnds);
1442 INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1443 INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1444
1445 /*
1446 * The hash table size is the number of bits it takes to express the set
1447 * ln_num_routes, minus 1 (better to under estimate than over so we
1448 * don't waste memory).
1449 */
1450 if (rnet_htable_size <= 0)
1451 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1452 else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1453 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1454 the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1455 order_base_2(rnet_htable_size) - 1);
1456
1457 /*
1458 * All LNDs apart from the LOLND are in separate modules. They
1459 * register themselves when their module loads, and unregister
1460 * themselves when their module is unloaded.
1461 */
1462 lnet_register_lnd(&the_lolnd);
1463 return 0;
1464 }
1465
1466 /**
1467 * Finalize LNet library.
1468 *
1469 * \pre lnet_lib_init() called with success.
1470 * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1471 */
lnet_lib_exit(void)1472 void lnet_lib_exit(void)
1473 {
1474 LASSERT(!the_lnet.ln_refcount);
1475
1476 while (!list_empty(&the_lnet.ln_lnds))
1477 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1478 struct lnet_lnd, lnd_list));
1479 lnet_destroy_locks();
1480 }
1481
1482 /**
1483 * Set LNet PID and start LNet interfaces, routing, and forwarding.
1484 *
1485 * Users must call this function at least once before any other functions.
1486 * For each successful call there must be a corresponding call to
1487 * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1488 * ignored.
1489 *
1490 * The PID used by LNet may be different from the one requested.
1491 * See LNetGetId().
1492 *
1493 * \param requested_pid PID requested by the caller.
1494 *
1495 * \return >= 0 on success, and < 0 error code on failures.
1496 */
1497 int
LNetNIInit(lnet_pid_t requested_pid)1498 LNetNIInit(lnet_pid_t requested_pid)
1499 {
1500 int im_a_router = 0;
1501 int rc;
1502 int ni_count;
1503 struct lnet_ping_info *pinfo;
1504 struct lnet_handle_md md_handle;
1505 struct list_head net_head;
1506
1507 INIT_LIST_HEAD(&net_head);
1508
1509 mutex_lock(&the_lnet.ln_api_mutex);
1510
1511 CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1512
1513 if (the_lnet.ln_refcount > 0) {
1514 rc = the_lnet.ln_refcount++;
1515 mutex_unlock(&the_lnet.ln_api_mutex);
1516 return rc;
1517 }
1518
1519 rc = lnet_prepare(requested_pid);
1520 if (rc) {
1521 mutex_unlock(&the_lnet.ln_api_mutex);
1522 return rc;
1523 }
1524
1525 /* Add in the loopback network */
1526 if (!lnet_ni_alloc(LNET_MKNET(LOLND, 0), NULL, &net_head)) {
1527 rc = -ENOMEM;
1528 goto err_empty_list;
1529 }
1530
1531 /*
1532 * If LNet is being initialized via DLC it is possible
1533 * that the user requests not to load module parameters (ones which
1534 * are supported by DLC) on initialization. Therefore, make sure not
1535 * to load networks, routes and forwarding from module parameters
1536 * in this case. On cleanup in case of failure only clean up
1537 * routes if it has been loaded
1538 */
1539 if (!the_lnet.ln_nis_from_mod_params) {
1540 rc = lnet_parse_networks(&net_head, lnet_get_networks());
1541 if (rc < 0)
1542 goto err_empty_list;
1543 }
1544
1545 ni_count = lnet_startup_lndnis(&net_head);
1546 if (ni_count < 0) {
1547 rc = ni_count;
1548 goto err_empty_list;
1549 }
1550
1551 if (!the_lnet.ln_nis_from_mod_params) {
1552 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1553 if (rc)
1554 goto err_shutdown_lndnis;
1555
1556 rc = lnet_check_routes();
1557 if (rc)
1558 goto err_destroy_routes;
1559
1560 rc = lnet_rtrpools_alloc(im_a_router);
1561 if (rc)
1562 goto err_destroy_routes;
1563 }
1564
1565 rc = lnet_acceptor_start();
1566 if (rc)
1567 goto err_destroy_routes;
1568
1569 the_lnet.ln_refcount = 1;
1570 /* Now I may use my own API functions... */
1571
1572 rc = lnet_ping_info_setup(&pinfo, &md_handle, ni_count, true);
1573 if (rc)
1574 goto err_acceptor_stop;
1575
1576 lnet_ping_target_update(pinfo, md_handle);
1577
1578 rc = lnet_router_checker_start();
1579 if (rc)
1580 goto err_stop_ping;
1581
1582 lnet_fault_init();
1583 lnet_router_debugfs_init();
1584
1585 mutex_unlock(&the_lnet.ln_api_mutex);
1586
1587 return 0;
1588
1589 err_stop_ping:
1590 lnet_ping_target_fini();
1591 err_acceptor_stop:
1592 the_lnet.ln_refcount = 0;
1593 lnet_acceptor_stop();
1594 err_destroy_routes:
1595 if (!the_lnet.ln_nis_from_mod_params)
1596 lnet_destroy_routes();
1597 err_shutdown_lndnis:
1598 lnet_shutdown_lndnis();
1599 err_empty_list:
1600 lnet_unprepare();
1601 LASSERT(rc < 0);
1602 mutex_unlock(&the_lnet.ln_api_mutex);
1603 while (!list_empty(&net_head)) {
1604 struct lnet_ni *ni;
1605
1606 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1607 list_del_init(&ni->ni_list);
1608 lnet_ni_free(ni);
1609 }
1610 return rc;
1611 }
1612 EXPORT_SYMBOL(LNetNIInit);
1613
1614 /**
1615 * Stop LNet interfaces, routing, and forwarding.
1616 *
1617 * Users must call this function once for each successful call to LNetNIInit().
1618 * Once the LNetNIFini() operation has been started, the results of pending
1619 * API operations are undefined.
1620 *
1621 * \return always 0 for current implementation.
1622 */
1623 int
LNetNIFini(void)1624 LNetNIFini(void)
1625 {
1626 mutex_lock(&the_lnet.ln_api_mutex);
1627
1628 LASSERT(the_lnet.ln_refcount > 0);
1629
1630 if (the_lnet.ln_refcount != 1) {
1631 the_lnet.ln_refcount--;
1632 } else {
1633 LASSERT(!the_lnet.ln_niinit_self);
1634
1635 lnet_fault_fini();
1636 lnet_router_debugfs_fini();
1637 lnet_router_checker_stop();
1638 lnet_ping_target_fini();
1639
1640 /* Teardown fns that use my own API functions BEFORE here */
1641 the_lnet.ln_refcount = 0;
1642
1643 lnet_acceptor_stop();
1644 lnet_destroy_routes();
1645 lnet_shutdown_lndnis();
1646 lnet_unprepare();
1647 }
1648
1649 mutex_unlock(&the_lnet.ln_api_mutex);
1650 return 0;
1651 }
1652 EXPORT_SYMBOL(LNetNIFini);
1653
1654 /**
1655 * Grabs the ni data from the ni structure and fills the out
1656 * parameters
1657 *
1658 * \param[in] ni network interface structure
1659 * \param[out] config NI configuration
1660 */
1661 static void
lnet_fill_ni_info(struct lnet_ni * ni,struct lnet_ioctl_config_data * config)1662 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_data *config)
1663 {
1664 struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
1665 struct lnet_ioctl_net_config *net_config;
1666 size_t min_size, tunable_size = 0;
1667 int i;
1668
1669 if (!ni || !config)
1670 return;
1671
1672 net_config = (struct lnet_ioctl_net_config *)config->cfg_bulk;
1673 if (!net_config)
1674 return;
1675
1676 BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
1677 ARRAY_SIZE(net_config->ni_interfaces));
1678
1679 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
1680 if (!ni->ni_interfaces[i])
1681 break;
1682
1683 strncpy(net_config->ni_interfaces[i],
1684 ni->ni_interfaces[i],
1685 sizeof(net_config->ni_interfaces[i]));
1686 }
1687
1688 config->cfg_nid = ni->ni_nid;
1689 config->cfg_config_u.cfg_net.net_peer_timeout = ni->ni_peertimeout;
1690 config->cfg_config_u.cfg_net.net_max_tx_credits = ni->ni_maxtxcredits;
1691 config->cfg_config_u.cfg_net.net_peer_tx_credits = ni->ni_peertxcredits;
1692 config->cfg_config_u.cfg_net.net_peer_rtr_credits = ni->ni_peerrtrcredits;
1693
1694 net_config->ni_status = ni->ni_status->ns_status;
1695
1696 if (ni->ni_cpts) {
1697 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
1698
1699 for (i = 0; i < num_cpts; i++)
1700 net_config->ni_cpts[i] = ni->ni_cpts[i];
1701
1702 config->cfg_ncpts = num_cpts;
1703 }
1704
1705 /*
1706 * See if user land tools sent in a newer and larger version
1707 * of struct lnet_tunables than what the kernel uses.
1708 */
1709 min_size = sizeof(*config) + sizeof(*net_config);
1710
1711 if (config->cfg_hdr.ioc_len > min_size)
1712 tunable_size = config->cfg_hdr.ioc_len - min_size;
1713
1714 /* Don't copy to much data to user space */
1715 min_size = min(tunable_size, sizeof(*ni->ni_lnd_tunables));
1716 lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
1717
1718 if (ni->ni_lnd_tunables && lnd_cfg && min_size) {
1719 memcpy(lnd_cfg, ni->ni_lnd_tunables, min_size);
1720 config->cfg_config_u.cfg_net.net_interface_count = 1;
1721
1722 /* Tell user land that kernel side has less data */
1723 if (tunable_size > sizeof(*ni->ni_lnd_tunables)) {
1724 min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
1725 config->cfg_hdr.ioc_len -= min_size;
1726 }
1727 }
1728 }
1729
1730 static int
lnet_get_net_config(struct lnet_ioctl_config_data * config)1731 lnet_get_net_config(struct lnet_ioctl_config_data *config)
1732 {
1733 struct lnet_ni *ni;
1734 struct list_head *tmp;
1735 int idx = config->cfg_count;
1736 int cpt, i = 0;
1737 int rc = -ENOENT;
1738
1739 cpt = lnet_net_lock_current();
1740
1741 list_for_each(tmp, &the_lnet.ln_nis) {
1742 if (i++ != idx)
1743 continue;
1744
1745 ni = list_entry(tmp, struct lnet_ni, ni_list);
1746 lnet_ni_lock(ni);
1747 lnet_fill_ni_info(ni, config);
1748 lnet_ni_unlock(ni);
1749 rc = 0;
1750 break;
1751 }
1752
1753 lnet_net_unlock(cpt);
1754 return rc;
1755 }
1756
1757 int
lnet_dyn_add_ni(lnet_pid_t requested_pid,struct lnet_ioctl_config_data * conf)1758 lnet_dyn_add_ni(lnet_pid_t requested_pid, struct lnet_ioctl_config_data *conf)
1759 {
1760 char *nets = conf->cfg_config_u.cfg_net.net_intf;
1761 struct lnet_ping_info *pinfo;
1762 struct lnet_handle_md md_handle;
1763 struct lnet_ni *ni;
1764 struct list_head net_head;
1765 struct lnet_remotenet *rnet;
1766 int rc;
1767
1768 INIT_LIST_HEAD(&net_head);
1769
1770 /* Create a ni structure for the network string */
1771 rc = lnet_parse_networks(&net_head, nets);
1772 if (rc <= 0)
1773 return !rc ? -EINVAL : rc;
1774
1775 mutex_lock(&the_lnet.ln_api_mutex);
1776
1777 if (rc > 1) {
1778 rc = -EINVAL; /* only add one interface per call */
1779 goto failed0;
1780 }
1781
1782 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1783
1784 lnet_net_lock(LNET_LOCK_EX);
1785 rnet = lnet_find_net_locked(LNET_NIDNET(ni->ni_nid));
1786 lnet_net_unlock(LNET_LOCK_EX);
1787 /*
1788 * make sure that the net added doesn't invalidate the current
1789 * configuration LNet is keeping
1790 */
1791 if (rnet) {
1792 CERROR("Adding net %s will invalidate routing configuration\n",
1793 nets);
1794 rc = -EUSERS;
1795 goto failed0;
1796 }
1797
1798 rc = lnet_ping_info_setup(&pinfo, &md_handle, 1 + lnet_get_ni_count(),
1799 false);
1800 if (rc)
1801 goto failed0;
1802
1803 list_del_init(&ni->ni_list);
1804
1805 rc = lnet_startup_lndni(ni, conf);
1806 if (rc)
1807 goto failed1;
1808
1809 if (ni->ni_lnd->lnd_accept) {
1810 rc = lnet_acceptor_start();
1811 if (rc < 0) {
1812 /* shutdown the ni that we just started */
1813 CERROR("Failed to start up acceptor thread\n");
1814 lnet_shutdown_lndni(ni);
1815 goto failed1;
1816 }
1817 }
1818
1819 lnet_ping_target_update(pinfo, md_handle);
1820 mutex_unlock(&the_lnet.ln_api_mutex);
1821
1822 return 0;
1823
1824 failed1:
1825 lnet_ping_md_unlink(pinfo, &md_handle);
1826 lnet_ping_info_free(pinfo);
1827 failed0:
1828 mutex_unlock(&the_lnet.ln_api_mutex);
1829 while (!list_empty(&net_head)) {
1830 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1831 list_del_init(&ni->ni_list);
1832 lnet_ni_free(ni);
1833 }
1834 return rc;
1835 }
1836
1837 int
lnet_dyn_del_ni(__u32 net)1838 lnet_dyn_del_ni(__u32 net)
1839 {
1840 struct lnet_ni *ni;
1841 struct lnet_ping_info *pinfo;
1842 struct lnet_handle_md md_handle;
1843 int rc;
1844
1845 /* don't allow userspace to shutdown the LOLND */
1846 if (LNET_NETTYP(net) == LOLND)
1847 return -EINVAL;
1848
1849 mutex_lock(&the_lnet.ln_api_mutex);
1850 /* create and link a new ping info, before removing the old one */
1851 rc = lnet_ping_info_setup(&pinfo, &md_handle,
1852 lnet_get_ni_count() - 1, false);
1853 if (rc)
1854 goto out;
1855
1856 ni = lnet_net2ni(net);
1857 if (!ni) {
1858 rc = -EINVAL;
1859 goto failed;
1860 }
1861
1862 /* decrement the reference counter taken by lnet_net2ni() */
1863 lnet_ni_decref_locked(ni, 0);
1864
1865 lnet_shutdown_lndni(ni);
1866
1867 if (!lnet_count_acceptor_nis())
1868 lnet_acceptor_stop();
1869
1870 lnet_ping_target_update(pinfo, md_handle);
1871 goto out;
1872 failed:
1873 lnet_ping_md_unlink(pinfo, &md_handle);
1874 lnet_ping_info_free(pinfo);
1875 out:
1876 mutex_unlock(&the_lnet.ln_api_mutex);
1877
1878 return rc;
1879 }
1880
1881 /**
1882 * LNet ioctl handler.
1883 *
1884 */
1885 int
LNetCtl(unsigned int cmd,void * arg)1886 LNetCtl(unsigned int cmd, void *arg)
1887 {
1888 struct libcfs_ioctl_data *data = arg;
1889 struct lnet_ioctl_config_data *config;
1890 struct lnet_process_id id = {0};
1891 struct lnet_ni *ni;
1892 int rc;
1893 unsigned long secs_passed;
1894
1895 BUILD_BUG_ON(LIBCFS_IOC_DATA_MAX <
1896 sizeof(struct lnet_ioctl_net_config) +
1897 sizeof(struct lnet_ioctl_config_data));
1898
1899 switch (cmd) {
1900 case IOC_LIBCFS_GET_NI:
1901 rc = LNetGetId(data->ioc_count, &id);
1902 data->ioc_nid = id.nid;
1903 return rc;
1904
1905 case IOC_LIBCFS_FAIL_NID:
1906 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1907
1908 case IOC_LIBCFS_ADD_ROUTE:
1909 config = arg;
1910
1911 if (config->cfg_hdr.ioc_len < sizeof(*config))
1912 return -EINVAL;
1913
1914 mutex_lock(&the_lnet.ln_api_mutex);
1915 rc = lnet_add_route(config->cfg_net,
1916 config->cfg_config_u.cfg_route.rtr_hop,
1917 config->cfg_nid,
1918 config->cfg_config_u.cfg_route.rtr_priority);
1919 if (!rc) {
1920 rc = lnet_check_routes();
1921 if (rc)
1922 lnet_del_route(config->cfg_net,
1923 config->cfg_nid);
1924 }
1925 mutex_unlock(&the_lnet.ln_api_mutex);
1926 return rc;
1927
1928 case IOC_LIBCFS_DEL_ROUTE:
1929 config = arg;
1930
1931 if (config->cfg_hdr.ioc_len < sizeof(*config))
1932 return -EINVAL;
1933
1934 mutex_lock(&the_lnet.ln_api_mutex);
1935 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
1936 mutex_unlock(&the_lnet.ln_api_mutex);
1937 return rc;
1938
1939 case IOC_LIBCFS_GET_ROUTE:
1940 config = arg;
1941
1942 if (config->cfg_hdr.ioc_len < sizeof(*config))
1943 return -EINVAL;
1944
1945 return lnet_get_route(config->cfg_count,
1946 &config->cfg_net,
1947 &config->cfg_config_u.cfg_route.rtr_hop,
1948 &config->cfg_nid,
1949 &config->cfg_config_u.cfg_route.rtr_flags,
1950 &config->cfg_config_u.cfg_route.rtr_priority);
1951
1952 case IOC_LIBCFS_GET_NET: {
1953 size_t total = sizeof(*config) +
1954 sizeof(struct lnet_ioctl_net_config);
1955 config = arg;
1956
1957 if (config->cfg_hdr.ioc_len < total)
1958 return -EINVAL;
1959
1960 return lnet_get_net_config(config);
1961 }
1962
1963 case IOC_LIBCFS_GET_LNET_STATS: {
1964 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
1965
1966 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
1967 return -EINVAL;
1968
1969 lnet_counters_get(&lnet_stats->st_cntrs);
1970 return 0;
1971 }
1972
1973 case IOC_LIBCFS_CONFIG_RTR:
1974 config = arg;
1975
1976 if (config->cfg_hdr.ioc_len < sizeof(*config))
1977 return -EINVAL;
1978
1979 mutex_lock(&the_lnet.ln_api_mutex);
1980 if (config->cfg_config_u.cfg_buffers.buf_enable) {
1981 rc = lnet_rtrpools_enable();
1982 mutex_unlock(&the_lnet.ln_api_mutex);
1983 return rc;
1984 }
1985 lnet_rtrpools_disable();
1986 mutex_unlock(&the_lnet.ln_api_mutex);
1987 return 0;
1988
1989 case IOC_LIBCFS_ADD_BUF:
1990 config = arg;
1991
1992 if (config->cfg_hdr.ioc_len < sizeof(*config))
1993 return -EINVAL;
1994
1995 mutex_lock(&the_lnet.ln_api_mutex);
1996 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.buf_tiny,
1997 config->cfg_config_u.cfg_buffers.buf_small,
1998 config->cfg_config_u.cfg_buffers.buf_large);
1999 mutex_unlock(&the_lnet.ln_api_mutex);
2000 return rc;
2001
2002 case IOC_LIBCFS_GET_BUF: {
2003 struct lnet_ioctl_pool_cfg *pool_cfg;
2004 size_t total = sizeof(*config) + sizeof(*pool_cfg);
2005
2006 config = arg;
2007
2008 if (config->cfg_hdr.ioc_len < total)
2009 return -EINVAL;
2010
2011 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
2012 return lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
2013 }
2014
2015 case IOC_LIBCFS_GET_PEER_INFO: {
2016 struct lnet_ioctl_peer *peer_info = arg;
2017
2018 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
2019 return -EINVAL;
2020
2021 return lnet_get_peer_info(peer_info->pr_count,
2022 &peer_info->pr_nid,
2023 peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
2024 &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
2025 &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
2026 &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
2027 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
2028 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
2029 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_rtr_credits,
2030 &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
2031 }
2032
2033 case IOC_LIBCFS_NOTIFY_ROUTER:
2034 secs_passed = (ktime_get_real_seconds() - data->ioc_u64[0]);
2035 secs_passed *= msecs_to_jiffies(MSEC_PER_SEC);
2036
2037 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
2038 jiffies - secs_passed);
2039
2040 case IOC_LIBCFS_LNET_DIST:
2041 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
2042 if (rc < 0 && rc != -EHOSTUNREACH)
2043 return rc;
2044
2045 data->ioc_u32[0] = rc;
2046 return 0;
2047
2048 case IOC_LIBCFS_TESTPROTOCOMPAT:
2049 lnet_net_lock(LNET_LOCK_EX);
2050 the_lnet.ln_testprotocompat = data->ioc_flags;
2051 lnet_net_unlock(LNET_LOCK_EX);
2052 return 0;
2053
2054 case IOC_LIBCFS_LNET_FAULT:
2055 return lnet_fault_ctl(data->ioc_flags, data);
2056
2057 case IOC_LIBCFS_PING:
2058 id.nid = data->ioc_nid;
2059 id.pid = data->ioc_u32[0];
2060 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
2061 data->ioc_pbuf1,
2062 data->ioc_plen1 / sizeof(struct lnet_process_id));
2063 if (rc < 0)
2064 return rc;
2065 data->ioc_count = rc;
2066 return 0;
2067
2068 default:
2069 ni = lnet_net2ni(data->ioc_net);
2070 if (!ni)
2071 return -EINVAL;
2072
2073 if (!ni->ni_lnd->lnd_ctl)
2074 rc = -EINVAL;
2075 else
2076 rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
2077
2078 lnet_ni_decref(ni);
2079 return rc;
2080 }
2081 /* not reached */
2082 }
2083 EXPORT_SYMBOL(LNetCtl);
2084
LNetDebugPeer(struct lnet_process_id id)2085 void LNetDebugPeer(struct lnet_process_id id)
2086 {
2087 lnet_debug_peer(id.nid);
2088 }
2089 EXPORT_SYMBOL(LNetDebugPeer);
2090
2091 /**
2092 * Retrieve the lnet_process_id ID of LNet interface at \a index. Note that
2093 * all interfaces share a same PID, as requested by LNetNIInit().
2094 *
2095 * \param index Index of the interface to look up.
2096 * \param id On successful return, this location will hold the
2097 * lnet_process_id ID of the interface.
2098 *
2099 * \retval 0 If an interface exists at \a index.
2100 * \retval -ENOENT If no interface has been found.
2101 */
2102 int
LNetGetId(unsigned int index,struct lnet_process_id * id)2103 LNetGetId(unsigned int index, struct lnet_process_id *id)
2104 {
2105 struct lnet_ni *ni;
2106 struct list_head *tmp;
2107 int cpt;
2108 int rc = -ENOENT;
2109
2110 LASSERT(the_lnet.ln_refcount > 0);
2111
2112 cpt = lnet_net_lock_current();
2113
2114 list_for_each(tmp, &the_lnet.ln_nis) {
2115 if (index--)
2116 continue;
2117
2118 ni = list_entry(tmp, struct lnet_ni, ni_list);
2119
2120 id->nid = ni->ni_nid;
2121 id->pid = the_lnet.ln_pid;
2122 rc = 0;
2123 break;
2124 }
2125
2126 lnet_net_unlock(cpt);
2127 return rc;
2128 }
2129 EXPORT_SYMBOL(LNetGetId);
2130
lnet_ping(struct lnet_process_id id,int timeout_ms,struct lnet_process_id __user * ids,int n_ids)2131 static int lnet_ping(struct lnet_process_id id, int timeout_ms,
2132 struct lnet_process_id __user *ids, int n_ids)
2133 {
2134 struct lnet_handle_eq eqh;
2135 struct lnet_handle_md mdh;
2136 struct lnet_event event;
2137 struct lnet_md md = { NULL };
2138 int which;
2139 int unlinked = 0;
2140 int replied = 0;
2141 const int a_long_time = 60000; /* mS */
2142 int infosz;
2143 struct lnet_ping_info *info;
2144 struct lnet_process_id tmpid;
2145 int i;
2146 int nob;
2147 int rc;
2148 int rc2;
2149 sigset_t blocked;
2150
2151 infosz = offsetof(struct lnet_ping_info, pi_ni[n_ids]);
2152
2153 if (n_ids <= 0 ||
2154 id.nid == LNET_NID_ANY ||
2155 timeout_ms > 500000 || /* arbitrary limit! */
2156 n_ids > 20) /* arbitrary limit! */
2157 return -EINVAL;
2158
2159 if (id.pid == LNET_PID_ANY)
2160 id.pid = LNET_PID_LUSTRE;
2161
2162 LIBCFS_ALLOC(info, infosz);
2163 if (!info)
2164 return -ENOMEM;
2165
2166 /* NB 2 events max (including any unlink event) */
2167 rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
2168 if (rc) {
2169 CERROR("Can't allocate EQ: %d\n", rc);
2170 goto out_0;
2171 }
2172
2173 /* initialize md content */
2174 md.start = info;
2175 md.length = infosz;
2176 md.threshold = 2; /*GET/REPLY*/
2177 md.max_size = 0;
2178 md.options = LNET_MD_TRUNCATE;
2179 md.user_ptr = NULL;
2180 md.eq_handle = eqh;
2181
2182 rc = LNetMDBind(md, LNET_UNLINK, &mdh);
2183 if (rc) {
2184 CERROR("Can't bind MD: %d\n", rc);
2185 goto out_1;
2186 }
2187
2188 rc = LNetGet(LNET_NID_ANY, mdh, id,
2189 LNET_RESERVED_PORTAL,
2190 LNET_PROTO_PING_MATCHBITS, 0);
2191
2192 if (rc) {
2193 /* Don't CERROR; this could be deliberate! */
2194
2195 rc2 = LNetMDUnlink(mdh);
2196 LASSERT(!rc2);
2197
2198 /* NB must wait for the UNLINK event below... */
2199 unlinked = 1;
2200 timeout_ms = a_long_time;
2201 }
2202
2203 do {
2204 /* MUST block for unlink to complete */
2205 if (unlinked)
2206 blocked = cfs_block_allsigs();
2207
2208 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
2209
2210 if (unlinked)
2211 cfs_restore_sigs(blocked);
2212
2213 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
2214 (rc2 <= 0) ? -1 : event.type,
2215 (rc2 <= 0) ? -1 : event.status,
2216 (rc2 > 0 && event.unlinked) ? " unlinked" : "");
2217
2218 LASSERT(rc2 != -EOVERFLOW); /* can't miss anything */
2219
2220 if (rc2 <= 0 || event.status) {
2221 /* timeout or error */
2222 if (!replied && !rc)
2223 rc = (rc2 < 0) ? rc2 :
2224 !rc2 ? -ETIMEDOUT :
2225 event.status;
2226
2227 if (!unlinked) {
2228 /* Ensure completion in finite time... */
2229 LNetMDUnlink(mdh);
2230 /* No assertion (racing with network) */
2231 unlinked = 1;
2232 timeout_ms = a_long_time;
2233 } else if (!rc2) {
2234 /* timed out waiting for unlink */
2235 CWARN("ping %s: late network completion\n",
2236 libcfs_id2str(id));
2237 }
2238 } else if (event.type == LNET_EVENT_REPLY) {
2239 replied = 1;
2240 rc = event.mlength;
2241 }
2242
2243 } while (rc2 <= 0 || !event.unlinked);
2244
2245 if (!replied) {
2246 if (rc >= 0)
2247 CWARN("%s: Unexpected rc >= 0 but no reply!\n",
2248 libcfs_id2str(id));
2249 rc = -EIO;
2250 goto out_1;
2251 }
2252
2253 nob = rc;
2254 LASSERT(nob >= 0 && nob <= infosz);
2255
2256 rc = -EPROTO; /* if I can't parse... */
2257
2258 if (nob < 8) {
2259 /* can't check magic/version */
2260 CERROR("%s: ping info too short %d\n",
2261 libcfs_id2str(id), nob);
2262 goto out_1;
2263 }
2264
2265 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
2266 lnet_swap_pinginfo(info);
2267 } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
2268 CERROR("%s: Unexpected magic %08x\n",
2269 libcfs_id2str(id), info->pi_magic);
2270 goto out_1;
2271 }
2272
2273 if (!(info->pi_features & LNET_PING_FEAT_NI_STATUS)) {
2274 CERROR("%s: ping w/o NI status: 0x%x\n",
2275 libcfs_id2str(id), info->pi_features);
2276 goto out_1;
2277 }
2278
2279 if (nob < offsetof(struct lnet_ping_info, pi_ni[0])) {
2280 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
2281 nob, (int)offsetof(struct lnet_ping_info, pi_ni[0]));
2282 goto out_1;
2283 }
2284
2285 if (info->pi_nnis < n_ids)
2286 n_ids = info->pi_nnis;
2287
2288 if (nob < offsetof(struct lnet_ping_info, pi_ni[n_ids])) {
2289 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
2290 nob, (int)offsetof(struct lnet_ping_info, pi_ni[n_ids]));
2291 goto out_1;
2292 }
2293
2294 rc = -EFAULT; /* If I SEGV... */
2295
2296 memset(&tmpid, 0, sizeof(tmpid));
2297 for (i = 0; i < n_ids; i++) {
2298 tmpid.pid = info->pi_pid;
2299 tmpid.nid = info->pi_ni[i].ns_nid;
2300 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
2301 goto out_1;
2302 }
2303 rc = info->pi_nnis;
2304
2305 out_1:
2306 rc2 = LNetEQFree(eqh);
2307 if (rc2)
2308 CERROR("rc2 %d\n", rc2);
2309 LASSERT(!rc2);
2310
2311 out_0:
2312 LIBCFS_FREE(info, infosz);
2313 return rc;
2314 }
2315