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[mirror_ubuntu-bionic-kernel.git] / drivers / staging / lustre / lnet / klnds / socklnd / socklnd.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * GPL HEADER START
4 *
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 only,
9 * as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License version 2 for more details (a copy is included
15 * in the LICENSE file that accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License
18 * version 2 along with this program; If not, see
19 * http://www.gnu.org/licenses/gpl-2.0.html
20 *
21 * GPL HEADER END
22 */
23 /*
24 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
25 * Use is subject to license terms.
26 *
27 * Copyright (c) 2011, 2015, Intel Corporation.
28 */
29 /*
30 * This file is part of Lustre, http://www.lustre.org/
31 * Lustre is a trademark of Sun Microsystems, Inc.
32 *
33 * lnet/klnds/socklnd/socklnd.c
34 *
35 * Author: Zach Brown <zab@zabbo.net>
36 * Author: Peter J. Braam <braam@clusterfs.com>
37 * Author: Phil Schwan <phil@clusterfs.com>
38 * Author: Eric Barton <eric@bartonsoftware.com>
39 */
40
41 #include "socklnd.h"
42
43 static struct lnet_lnd the_ksocklnd;
44 struct ksock_nal_data ksocknal_data;
45
46 static struct ksock_interface *
47 ksocknal_ip2iface(struct lnet_ni *ni, __u32 ip)
48 {
49 struct ksock_net *net = ni->ni_data;
50 int i;
51 struct ksock_interface *iface;
52
53 for (i = 0; i < net->ksnn_ninterfaces; i++) {
54 LASSERT(i < LNET_MAX_INTERFACES);
55 iface = &net->ksnn_interfaces[i];
56
57 if (iface->ksni_ipaddr == ip)
58 return iface;
59 }
60
61 return NULL;
62 }
63
64 static struct ksock_route *
65 ksocknal_create_route(__u32 ipaddr, int port)
66 {
67 struct ksock_route *route;
68
69 LIBCFS_ALLOC(route, sizeof(*route));
70 if (!route)
71 return NULL;
72
73 atomic_set(&route->ksnr_refcount, 1);
74 route->ksnr_peer = NULL;
75 route->ksnr_retry_interval = 0; /* OK to connect at any time */
76 route->ksnr_ipaddr = ipaddr;
77 route->ksnr_port = port;
78 route->ksnr_scheduled = 0;
79 route->ksnr_connecting = 0;
80 route->ksnr_connected = 0;
81 route->ksnr_deleted = 0;
82 route->ksnr_conn_count = 0;
83 route->ksnr_share_count = 0;
84
85 return route;
86 }
87
88 void
89 ksocknal_destroy_route(struct ksock_route *route)
90 {
91 LASSERT(!atomic_read(&route->ksnr_refcount));
92
93 if (route->ksnr_peer)
94 ksocknal_peer_decref(route->ksnr_peer);
95
96 LIBCFS_FREE(route, sizeof(*route));
97 }
98
99 static int
100 ksocknal_create_peer(struct ksock_peer **peerp, struct lnet_ni *ni,
101 struct lnet_process_id id)
102 {
103 int cpt = lnet_cpt_of_nid(id.nid);
104 struct ksock_net *net = ni->ni_data;
105 struct ksock_peer *peer;
106
107 LASSERT(id.nid != LNET_NID_ANY);
108 LASSERT(id.pid != LNET_PID_ANY);
109 LASSERT(!in_interrupt());
110
111 LIBCFS_CPT_ALLOC(peer, lnet_cpt_table(), cpt, sizeof(*peer));
112 if (!peer)
113 return -ENOMEM;
114
115 peer->ksnp_ni = ni;
116 peer->ksnp_id = id;
117 atomic_set(&peer->ksnp_refcount, 1); /* 1 ref for caller */
118 peer->ksnp_closing = 0;
119 peer->ksnp_accepting = 0;
120 peer->ksnp_proto = NULL;
121 peer->ksnp_last_alive = 0;
122 peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
123
124 INIT_LIST_HEAD(&peer->ksnp_conns);
125 INIT_LIST_HEAD(&peer->ksnp_routes);
126 INIT_LIST_HEAD(&peer->ksnp_tx_queue);
127 INIT_LIST_HEAD(&peer->ksnp_zc_req_list);
128 spin_lock_init(&peer->ksnp_lock);
129
130 spin_lock_bh(&net->ksnn_lock);
131
132 if (net->ksnn_shutdown) {
133 spin_unlock_bh(&net->ksnn_lock);
134
135 LIBCFS_FREE(peer, sizeof(*peer));
136 CERROR("Can't create peer: network shutdown\n");
137 return -ESHUTDOWN;
138 }
139
140 net->ksnn_npeers++;
141
142 spin_unlock_bh(&net->ksnn_lock);
143
144 *peerp = peer;
145 return 0;
146 }
147
148 void
149 ksocknal_destroy_peer(struct ksock_peer *peer)
150 {
151 struct ksock_net *net = peer->ksnp_ni->ni_data;
152
153 CDEBUG(D_NET, "peer %s %p deleted\n",
154 libcfs_id2str(peer->ksnp_id), peer);
155
156 LASSERT(!atomic_read(&peer->ksnp_refcount));
157 LASSERT(!peer->ksnp_accepting);
158 LASSERT(list_empty(&peer->ksnp_conns));
159 LASSERT(list_empty(&peer->ksnp_routes));
160 LASSERT(list_empty(&peer->ksnp_tx_queue));
161 LASSERT(list_empty(&peer->ksnp_zc_req_list));
162
163 LIBCFS_FREE(peer, sizeof(*peer));
164
165 /*
166 * NB a peer's connections and routes keep a reference on their peer
167 * until they are destroyed, so we can be assured that _all_ state to
168 * do with this peer has been cleaned up when its refcount drops to
169 * zero.
170 */
171 spin_lock_bh(&net->ksnn_lock);
172 net->ksnn_npeers--;
173 spin_unlock_bh(&net->ksnn_lock);
174 }
175
176 struct ksock_peer *
177 ksocknal_find_peer_locked(struct lnet_ni *ni, struct lnet_process_id id)
178 {
179 struct list_head *peer_list = ksocknal_nid2peerlist(id.nid);
180 struct ksock_peer *peer;
181
182 list_for_each_entry(peer, peer_list, ksnp_list) {
183 LASSERT(!peer->ksnp_closing);
184
185 if (peer->ksnp_ni != ni)
186 continue;
187
188 if (peer->ksnp_id.nid != id.nid ||
189 peer->ksnp_id.pid != id.pid)
190 continue;
191
192 CDEBUG(D_NET, "got peer [%p] -> %s (%d)\n",
193 peer, libcfs_id2str(id),
194 atomic_read(&peer->ksnp_refcount));
195 return peer;
196 }
197 return NULL;
198 }
199
200 struct ksock_peer *
201 ksocknal_find_peer(struct lnet_ni *ni, struct lnet_process_id id)
202 {
203 struct ksock_peer *peer;
204
205 read_lock(&ksocknal_data.ksnd_global_lock);
206 peer = ksocknal_find_peer_locked(ni, id);
207 if (peer) /* +1 ref for caller? */
208 ksocknal_peer_addref(peer);
209 read_unlock(&ksocknal_data.ksnd_global_lock);
210
211 return peer;
212 }
213
214 static void
215 ksocknal_unlink_peer_locked(struct ksock_peer *peer)
216 {
217 int i;
218 __u32 ip;
219 struct ksock_interface *iface;
220
221 for (i = 0; i < peer->ksnp_n_passive_ips; i++) {
222 LASSERT(i < LNET_MAX_INTERFACES);
223 ip = peer->ksnp_passive_ips[i];
224
225 iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
226 /*
227 * All IPs in peer->ksnp_passive_ips[] come from the
228 * interface list, therefore the call must succeed.
229 */
230 LASSERT(iface);
231
232 CDEBUG(D_NET, "peer=%p iface=%p ksni_nroutes=%d\n",
233 peer, iface, iface->ksni_nroutes);
234 iface->ksni_npeers--;
235 }
236
237 LASSERT(list_empty(&peer->ksnp_conns));
238 LASSERT(list_empty(&peer->ksnp_routes));
239 LASSERT(!peer->ksnp_closing);
240 peer->ksnp_closing = 1;
241 list_del(&peer->ksnp_list);
242 /* lose peerlist's ref */
243 ksocknal_peer_decref(peer);
244 }
245
246 static int
247 ksocknal_get_peer_info(struct lnet_ni *ni, int index,
248 struct lnet_process_id *id, __u32 *myip, __u32 *peer_ip,
249 int *port, int *conn_count, int *share_count)
250 {
251 struct ksock_peer *peer;
252 struct list_head *ptmp;
253 struct ksock_route *route;
254 struct list_head *rtmp;
255 int i;
256 int j;
257 int rc = -ENOENT;
258
259 read_lock(&ksocknal_data.ksnd_global_lock);
260
261 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
262 list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
263 peer = list_entry(ptmp, struct ksock_peer, ksnp_list);
264
265 if (peer->ksnp_ni != ni)
266 continue;
267
268 if (!peer->ksnp_n_passive_ips &&
269 list_empty(&peer->ksnp_routes)) {
270 if (index-- > 0)
271 continue;
272
273 *id = peer->ksnp_id;
274 *myip = 0;
275 *peer_ip = 0;
276 *port = 0;
277 *conn_count = 0;
278 *share_count = 0;
279 rc = 0;
280 goto out;
281 }
282
283 for (j = 0; j < peer->ksnp_n_passive_ips; j++) {
284 if (index-- > 0)
285 continue;
286
287 *id = peer->ksnp_id;
288 *myip = peer->ksnp_passive_ips[j];
289 *peer_ip = 0;
290 *port = 0;
291 *conn_count = 0;
292 *share_count = 0;
293 rc = 0;
294 goto out;
295 }
296
297 list_for_each(rtmp, &peer->ksnp_routes) {
298 if (index-- > 0)
299 continue;
300
301 route = list_entry(rtmp, struct ksock_route,
302 ksnr_list);
303
304 *id = peer->ksnp_id;
305 *myip = route->ksnr_myipaddr;
306 *peer_ip = route->ksnr_ipaddr;
307 *port = route->ksnr_port;
308 *conn_count = route->ksnr_conn_count;
309 *share_count = route->ksnr_share_count;
310 rc = 0;
311 goto out;
312 }
313 }
314 }
315 out:
316 read_unlock(&ksocknal_data.ksnd_global_lock);
317 return rc;
318 }
319
320 static void
321 ksocknal_associate_route_conn_locked(struct ksock_route *route,
322 struct ksock_conn *conn)
323 {
324 struct ksock_peer *peer = route->ksnr_peer;
325 int type = conn->ksnc_type;
326 struct ksock_interface *iface;
327
328 conn->ksnc_route = route;
329 ksocknal_route_addref(route);
330
331 if (route->ksnr_myipaddr != conn->ksnc_myipaddr) {
332 if (!route->ksnr_myipaddr) {
333 /* route wasn't bound locally yet (the initial route) */
334 CDEBUG(D_NET, "Binding %s %pI4h to %pI4h\n",
335 libcfs_id2str(peer->ksnp_id),
336 &route->ksnr_ipaddr,
337 &conn->ksnc_myipaddr);
338 } else {
339 CDEBUG(D_NET, "Rebinding %s %pI4h from %pI4h to %pI4h\n",
340 libcfs_id2str(peer->ksnp_id),
341 &route->ksnr_ipaddr,
342 &route->ksnr_myipaddr,
343 &conn->ksnc_myipaddr);
344
345 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
346 route->ksnr_myipaddr);
347 if (iface)
348 iface->ksni_nroutes--;
349 }
350 route->ksnr_myipaddr = conn->ksnc_myipaddr;
351 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
352 route->ksnr_myipaddr);
353 if (iface)
354 iface->ksni_nroutes++;
355 }
356
357 route->ksnr_connected |= (1 << type);
358 route->ksnr_conn_count++;
359
360 /*
361 * Successful connection => further attempts can
362 * proceed immediately
363 */
364 route->ksnr_retry_interval = 0;
365 }
366
367 static void
368 ksocknal_add_route_locked(struct ksock_peer *peer, struct ksock_route *route)
369 {
370 struct list_head *tmp;
371 struct ksock_conn *conn;
372 struct ksock_route *route2;
373
374 LASSERT(!peer->ksnp_closing);
375 LASSERT(!route->ksnr_peer);
376 LASSERT(!route->ksnr_scheduled);
377 LASSERT(!route->ksnr_connecting);
378 LASSERT(!route->ksnr_connected);
379
380 /* LASSERT(unique) */
381 list_for_each(tmp, &peer->ksnp_routes) {
382 route2 = list_entry(tmp, struct ksock_route, ksnr_list);
383
384 if (route2->ksnr_ipaddr == route->ksnr_ipaddr) {
385 CERROR("Duplicate route %s %pI4h\n",
386 libcfs_id2str(peer->ksnp_id),
387 &route->ksnr_ipaddr);
388 LBUG();
389 }
390 }
391
392 route->ksnr_peer = peer;
393 ksocknal_peer_addref(peer);
394 /* peer's routelist takes over my ref on 'route' */
395 list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
396
397 list_for_each(tmp, &peer->ksnp_conns) {
398 conn = list_entry(tmp, struct ksock_conn, ksnc_list);
399
400 if (conn->ksnc_ipaddr != route->ksnr_ipaddr)
401 continue;
402
403 ksocknal_associate_route_conn_locked(route, conn);
404 /* keep going (typed routes) */
405 }
406 }
407
408 static void
409 ksocknal_del_route_locked(struct ksock_route *route)
410 {
411 struct ksock_peer *peer = route->ksnr_peer;
412 struct ksock_interface *iface;
413 struct ksock_conn *conn;
414 struct list_head *ctmp;
415 struct list_head *cnxt;
416
417 LASSERT(!route->ksnr_deleted);
418
419 /* Close associated conns */
420 list_for_each_safe(ctmp, cnxt, &peer->ksnp_conns) {
421 conn = list_entry(ctmp, struct ksock_conn, ksnc_list);
422
423 if (conn->ksnc_route != route)
424 continue;
425
426 ksocknal_close_conn_locked(conn, 0);
427 }
428
429 if (route->ksnr_myipaddr) {
430 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
431 route->ksnr_myipaddr);
432 if (iface)
433 iface->ksni_nroutes--;
434 }
435
436 route->ksnr_deleted = 1;
437 list_del(&route->ksnr_list);
438 ksocknal_route_decref(route); /* drop peer's ref */
439
440 if (list_empty(&peer->ksnp_routes) &&
441 list_empty(&peer->ksnp_conns)) {
442 /*
443 * I've just removed the last route to a peer with no active
444 * connections
445 */
446 ksocknal_unlink_peer_locked(peer);
447 }
448 }
449
450 int
451 ksocknal_add_peer(struct lnet_ni *ni, struct lnet_process_id id, __u32 ipaddr,
452 int port)
453 {
454 struct ksock_peer *peer;
455 struct ksock_peer *peer2;
456 struct ksock_route *route;
457 struct ksock_route *route2;
458 int rc;
459
460 if (id.nid == LNET_NID_ANY ||
461 id.pid == LNET_PID_ANY)
462 return -EINVAL;
463
464 /* Have a brand new peer ready... */
465 rc = ksocknal_create_peer(&peer, ni, id);
466 if (rc)
467 return rc;
468
469 route = ksocknal_create_route(ipaddr, port);
470 if (!route) {
471 ksocknal_peer_decref(peer);
472 return -ENOMEM;
473 }
474
475 write_lock_bh(&ksocknal_data.ksnd_global_lock);
476
477 /* always called with a ref on ni, so shutdown can't have started */
478 LASSERT(!((struct ksock_net *)ni->ni_data)->ksnn_shutdown);
479
480 peer2 = ksocknal_find_peer_locked(ni, id);
481 if (peer2) {
482 ksocknal_peer_decref(peer);
483 peer = peer2;
484 } else {
485 /* peer table takes my ref on peer */
486 list_add_tail(&peer->ksnp_list,
487 ksocknal_nid2peerlist(id.nid));
488 }
489
490 route2 = NULL;
491 list_for_each_entry(route2, &peer->ksnp_routes, ksnr_list) {
492 if (route2->ksnr_ipaddr == ipaddr)
493 break;
494
495 route2 = NULL;
496 }
497 if (!route2) {
498 ksocknal_add_route_locked(peer, route);
499 route->ksnr_share_count++;
500 } else {
501 ksocknal_route_decref(route);
502 route2->ksnr_share_count++;
503 }
504
505 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
506
507 return 0;
508 }
509
510 static void
511 ksocknal_del_peer_locked(struct ksock_peer *peer, __u32 ip)
512 {
513 struct ksock_conn *conn;
514 struct ksock_route *route;
515 struct list_head *tmp;
516 struct list_head *nxt;
517 int nshared;
518
519 LASSERT(!peer->ksnp_closing);
520
521 /* Extra ref prevents peer disappearing until I'm done with it */
522 ksocknal_peer_addref(peer);
523
524 list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
525 route = list_entry(tmp, struct ksock_route, ksnr_list);
526
527 /* no match */
528 if (!(!ip || route->ksnr_ipaddr == ip))
529 continue;
530
531 route->ksnr_share_count = 0;
532 /* This deletes associated conns too */
533 ksocknal_del_route_locked(route);
534 }
535
536 nshared = 0;
537 list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
538 route = list_entry(tmp, struct ksock_route, ksnr_list);
539 nshared += route->ksnr_share_count;
540 }
541
542 if (!nshared) {
543 /*
544 * remove everything else if there are no explicit entries
545 * left
546 */
547 list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
548 route = list_entry(tmp, struct ksock_route, ksnr_list);
549
550 /* we should only be removing auto-entries */
551 LASSERT(!route->ksnr_share_count);
552 ksocknal_del_route_locked(route);
553 }
554
555 list_for_each_safe(tmp, nxt, &peer->ksnp_conns) {
556 conn = list_entry(tmp, struct ksock_conn, ksnc_list);
557
558 ksocknal_close_conn_locked(conn, 0);
559 }
560 }
561
562 ksocknal_peer_decref(peer);
563 /* NB peer unlinks itself when last conn/route is removed */
564 }
565
566 static int
567 ksocknal_del_peer(struct lnet_ni *ni, struct lnet_process_id id, __u32 ip)
568 {
569 LIST_HEAD(zombies);
570 struct list_head *ptmp;
571 struct list_head *pnxt;
572 struct ksock_peer *peer;
573 int lo;
574 int hi;
575 int i;
576 int rc = -ENOENT;
577
578 write_lock_bh(&ksocknal_data.ksnd_global_lock);
579
580 if (id.nid != LNET_NID_ANY) {
581 lo = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
582 hi = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
583 } else {
584 lo = 0;
585 hi = ksocknal_data.ksnd_peer_hash_size - 1;
586 }
587
588 for (i = lo; i <= hi; i++) {
589 list_for_each_safe(ptmp, pnxt, &ksocknal_data.ksnd_peers[i]) {
590 peer = list_entry(ptmp, struct ksock_peer, ksnp_list);
591
592 if (peer->ksnp_ni != ni)
593 continue;
594
595 if (!((id.nid == LNET_NID_ANY || peer->ksnp_id.nid == id.nid) &&
596 (id.pid == LNET_PID_ANY || peer->ksnp_id.pid == id.pid)))
597 continue;
598
599 ksocknal_peer_addref(peer); /* a ref for me... */
600
601 ksocknal_del_peer_locked(peer, ip);
602
603 if (peer->ksnp_closing &&
604 !list_empty(&peer->ksnp_tx_queue)) {
605 LASSERT(list_empty(&peer->ksnp_conns));
606 LASSERT(list_empty(&peer->ksnp_routes));
607
608 list_splice_init(&peer->ksnp_tx_queue,
609 &zombies);
610 }
611
612 ksocknal_peer_decref(peer); /* ...till here */
613
614 rc = 0; /* matched! */
615 }
616 }
617
618 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
619
620 ksocknal_txlist_done(ni, &zombies, 1);
621
622 return rc;
623 }
624
625 static struct ksock_conn *
626 ksocknal_get_conn_by_idx(struct lnet_ni *ni, int index)
627 {
628 struct ksock_peer *peer;
629 struct list_head *ptmp;
630 struct ksock_conn *conn;
631 struct list_head *ctmp;
632 int i;
633
634 read_lock(&ksocknal_data.ksnd_global_lock);
635
636 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
637 list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
638 peer = list_entry(ptmp, struct ksock_peer, ksnp_list);
639
640 LASSERT(!peer->ksnp_closing);
641
642 if (peer->ksnp_ni != ni)
643 continue;
644
645 list_for_each(ctmp, &peer->ksnp_conns) {
646 if (index-- > 0)
647 continue;
648
649 conn = list_entry(ctmp, struct ksock_conn,
650 ksnc_list);
651 ksocknal_conn_addref(conn);
652 read_unlock(&ksocknal_data.ksnd_global_lock);
653 return conn;
654 }
655 }
656 }
657
658 read_unlock(&ksocknal_data.ksnd_global_lock);
659 return NULL;
660 }
661
662 static struct ksock_sched *
663 ksocknal_choose_scheduler_locked(unsigned int cpt)
664 {
665 struct ksock_sched_info *info = ksocknal_data.ksnd_sched_info[cpt];
666 struct ksock_sched *sched;
667 int i;
668
669 LASSERT(info->ksi_nthreads > 0);
670
671 sched = &info->ksi_scheds[0];
672 /*
673 * NB: it's safe so far, but info->ksi_nthreads could be changed
674 * at runtime when we have dynamic LNet configuration, then we
675 * need to take care of this.
676 */
677 for (i = 1; i < info->ksi_nthreads; i++) {
678 if (sched->kss_nconns > info->ksi_scheds[i].kss_nconns)
679 sched = &info->ksi_scheds[i];
680 }
681
682 return sched;
683 }
684
685 static int
686 ksocknal_local_ipvec(struct lnet_ni *ni, __u32 *ipaddrs)
687 {
688 struct ksock_net *net = ni->ni_data;
689 int i;
690 int nip;
691
692 read_lock(&ksocknal_data.ksnd_global_lock);
693
694 nip = net->ksnn_ninterfaces;
695 LASSERT(nip <= LNET_MAX_INTERFACES);
696
697 /*
698 * Only offer interfaces for additional connections if I have
699 * more than one.
700 */
701 if (nip < 2) {
702 read_unlock(&ksocknal_data.ksnd_global_lock);
703 return 0;
704 }
705
706 for (i = 0; i < nip; i++) {
707 ipaddrs[i] = net->ksnn_interfaces[i].ksni_ipaddr;
708 LASSERT(ipaddrs[i]);
709 }
710
711 read_unlock(&ksocknal_data.ksnd_global_lock);
712 return nip;
713 }
714
715 static int
716 ksocknal_match_peerip(struct ksock_interface *iface, __u32 *ips, int nips)
717 {
718 int best_netmatch = 0;
719 int best_xor = 0;
720 int best = -1;
721 int this_xor;
722 int this_netmatch;
723 int i;
724
725 for (i = 0; i < nips; i++) {
726 if (!ips[i])
727 continue;
728
729 this_xor = ips[i] ^ iface->ksni_ipaddr;
730 this_netmatch = !(this_xor & iface->ksni_netmask) ? 1 : 0;
731
732 if (!(best < 0 ||
733 best_netmatch < this_netmatch ||
734 (best_netmatch == this_netmatch &&
735 best_xor > this_xor)))
736 continue;
737
738 best = i;
739 best_netmatch = this_netmatch;
740 best_xor = this_xor;
741 }
742
743 LASSERT(best >= 0);
744 return best;
745 }
746
747 static int
748 ksocknal_select_ips(struct ksock_peer *peer, __u32 *peerips, int n_peerips)
749 {
750 rwlock_t *global_lock = &ksocknal_data.ksnd_global_lock;
751 struct ksock_net *net = peer->ksnp_ni->ni_data;
752 struct ksock_interface *iface;
753 struct ksock_interface *best_iface;
754 int n_ips;
755 int i;
756 int j;
757 int k;
758 __u32 ip;
759 __u32 xor;
760 int this_netmatch;
761 int best_netmatch;
762 int best_npeers;
763
764 /*
765 * CAVEAT EMPTOR: We do all our interface matching with an
766 * exclusive hold of global lock at IRQ priority. We're only
767 * expecting to be dealing with small numbers of interfaces, so the
768 * O(n**3)-ness shouldn't matter
769 */
770 /*
771 * Also note that I'm not going to return more than n_peerips
772 * interfaces, even if I have more myself
773 */
774 write_lock_bh(global_lock);
775
776 LASSERT(n_peerips <= LNET_MAX_INTERFACES);
777 LASSERT(net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
778
779 /*
780 * Only match interfaces for additional connections
781 * if I have > 1 interface
782 */
783 n_ips = (net->ksnn_ninterfaces < 2) ? 0 :
784 min(n_peerips, net->ksnn_ninterfaces);
785
786 for (i = 0; peer->ksnp_n_passive_ips < n_ips; i++) {
787 /* ^ yes really... */
788
789 /*
790 * If we have any new interfaces, first tick off all the
791 * peer IPs that match old interfaces, then choose new
792 * interfaces to match the remaining peer IPS.
793 * We don't forget interfaces we've stopped using; we might
794 * start using them again...
795 */
796 if (i < peer->ksnp_n_passive_ips) {
797 /* Old interface. */
798 ip = peer->ksnp_passive_ips[i];
799 best_iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
800
801 /* peer passive ips are kept up to date */
802 LASSERT(best_iface);
803 } else {
804 /* choose a new interface */
805 LASSERT(i == peer->ksnp_n_passive_ips);
806
807 best_iface = NULL;
808 best_netmatch = 0;
809 best_npeers = 0;
810
811 for (j = 0; j < net->ksnn_ninterfaces; j++) {
812 iface = &net->ksnn_interfaces[j];
813 ip = iface->ksni_ipaddr;
814
815 for (k = 0; k < peer->ksnp_n_passive_ips; k++)
816 if (peer->ksnp_passive_ips[k] == ip)
817 break;
818
819 if (k < peer->ksnp_n_passive_ips) /* using it already */
820 continue;
821
822 k = ksocknal_match_peerip(iface, peerips,
823 n_peerips);
824 xor = ip ^ peerips[k];
825 this_netmatch = !(xor & iface->ksni_netmask) ? 1 : 0;
826
827 if (!(!best_iface ||
828 best_netmatch < this_netmatch ||
829 (best_netmatch == this_netmatch &&
830 best_npeers > iface->ksni_npeers)))
831 continue;
832
833 best_iface = iface;
834 best_netmatch = this_netmatch;
835 best_npeers = iface->ksni_npeers;
836 }
837
838 LASSERT(best_iface);
839
840 best_iface->ksni_npeers++;
841 ip = best_iface->ksni_ipaddr;
842 peer->ksnp_passive_ips[i] = ip;
843 peer->ksnp_n_passive_ips = i + 1;
844 }
845
846 /* mark the best matching peer IP used */
847 j = ksocknal_match_peerip(best_iface, peerips, n_peerips);
848 peerips[j] = 0;
849 }
850
851 /* Overwrite input peer IP addresses */
852 memcpy(peerips, peer->ksnp_passive_ips, n_ips * sizeof(*peerips));
853
854 write_unlock_bh(global_lock);
855
856 return n_ips;
857 }
858
859 static void
860 ksocknal_create_routes(struct ksock_peer *peer, int port,
861 __u32 *peer_ipaddrs, int npeer_ipaddrs)
862 {
863 struct ksock_route *newroute = NULL;
864 rwlock_t *global_lock = &ksocknal_data.ksnd_global_lock;
865 struct lnet_ni *ni = peer->ksnp_ni;
866 struct ksock_net *net = ni->ni_data;
867 struct list_head *rtmp;
868 struct ksock_route *route;
869 struct ksock_interface *iface;
870 struct ksock_interface *best_iface;
871 int best_netmatch;
872 int this_netmatch;
873 int best_nroutes;
874 int i;
875 int j;
876
877 /*
878 * CAVEAT EMPTOR: We do all our interface matching with an
879 * exclusive hold of global lock at IRQ priority. We're only
880 * expecting to be dealing with small numbers of interfaces, so the
881 * O(n**3)-ness here shouldn't matter
882 */
883 write_lock_bh(global_lock);
884
885 if (net->ksnn_ninterfaces < 2) {
886 /*
887 * Only create additional connections
888 * if I have > 1 interface
889 */
890 write_unlock_bh(global_lock);
891 return;
892 }
893
894 LASSERT(npeer_ipaddrs <= LNET_MAX_INTERFACES);
895
896 for (i = 0; i < npeer_ipaddrs; i++) {
897 if (newroute) {
898 newroute->ksnr_ipaddr = peer_ipaddrs[i];
899 } else {
900 write_unlock_bh(global_lock);
901
902 newroute = ksocknal_create_route(peer_ipaddrs[i], port);
903 if (!newroute)
904 return;
905
906 write_lock_bh(global_lock);
907 }
908
909 if (peer->ksnp_closing) {
910 /* peer got closed under me */
911 break;
912 }
913
914 /* Already got a route? */
915 route = NULL;
916 list_for_each(rtmp, &peer->ksnp_routes) {
917 route = list_entry(rtmp, struct ksock_route, ksnr_list);
918
919 if (route->ksnr_ipaddr == newroute->ksnr_ipaddr)
920 break;
921
922 route = NULL;
923 }
924 if (route)
925 continue;
926
927 best_iface = NULL;
928 best_nroutes = 0;
929 best_netmatch = 0;
930
931 LASSERT(net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
932
933 /* Select interface to connect from */
934 for (j = 0; j < net->ksnn_ninterfaces; j++) {
935 iface = &net->ksnn_interfaces[j];
936
937 /* Using this interface already? */
938 list_for_each(rtmp, &peer->ksnp_routes) {
939 route = list_entry(rtmp, struct ksock_route,
940 ksnr_list);
941
942 if (route->ksnr_myipaddr == iface->ksni_ipaddr)
943 break;
944
945 route = NULL;
946 }
947 if (route)
948 continue;
949
950 this_netmatch = (!((iface->ksni_ipaddr ^
951 newroute->ksnr_ipaddr) &
952 iface->ksni_netmask)) ? 1 : 0;
953
954 if (!(!best_iface ||
955 best_netmatch < this_netmatch ||
956 (best_netmatch == this_netmatch &&
957 best_nroutes > iface->ksni_nroutes)))
958 continue;
959
960 best_iface = iface;
961 best_netmatch = this_netmatch;
962 best_nroutes = iface->ksni_nroutes;
963 }
964
965 if (!best_iface)
966 continue;
967
968 newroute->ksnr_myipaddr = best_iface->ksni_ipaddr;
969 best_iface->ksni_nroutes++;
970
971 ksocknal_add_route_locked(peer, newroute);
972 newroute = NULL;
973 }
974
975 write_unlock_bh(global_lock);
976 if (newroute)
977 ksocknal_route_decref(newroute);
978 }
979
980 int
981 ksocknal_accept(struct lnet_ni *ni, struct socket *sock)
982 {
983 struct ksock_connreq *cr;
984 int rc;
985 __u32 peer_ip;
986 int peer_port;
987
988 rc = lnet_sock_getaddr(sock, 1, &peer_ip, &peer_port);
989 LASSERT(!rc); /* we succeeded before */
990
991 LIBCFS_ALLOC(cr, sizeof(*cr));
992 if (!cr) {
993 LCONSOLE_ERROR_MSG(0x12f, "Dropping connection request from %pI4h: memory exhausted\n",
994 &peer_ip);
995 return -ENOMEM;
996 }
997
998 lnet_ni_addref(ni);
999 cr->ksncr_ni = ni;
1000 cr->ksncr_sock = sock;
1001
1002 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
1003
1004 list_add_tail(&cr->ksncr_list, &ksocknal_data.ksnd_connd_connreqs);
1005 wake_up(&ksocknal_data.ksnd_connd_waitq);
1006
1007 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
1008 return 0;
1009 }
1010
1011 static int
1012 ksocknal_connecting(struct ksock_peer *peer, __u32 ipaddr)
1013 {
1014 struct ksock_route *route;
1015
1016 list_for_each_entry(route, &peer->ksnp_routes, ksnr_list) {
1017 if (route->ksnr_ipaddr == ipaddr)
1018 return route->ksnr_connecting;
1019 }
1020 return 0;
1021 }
1022
1023 int
1024 ksocknal_create_conn(struct lnet_ni *ni, struct ksock_route *route,
1025 struct socket *sock, int type)
1026 {
1027 rwlock_t *global_lock = &ksocknal_data.ksnd_global_lock;
1028 LIST_HEAD(zombies);
1029 struct lnet_process_id peerid;
1030 struct list_head *tmp;
1031 __u64 incarnation;
1032 struct ksock_conn *conn;
1033 struct ksock_conn *conn2;
1034 struct ksock_peer *peer = NULL;
1035 struct ksock_peer *peer2;
1036 struct ksock_sched *sched;
1037 struct ksock_hello_msg *hello;
1038 int cpt;
1039 struct ksock_tx *tx;
1040 struct ksock_tx *txtmp;
1041 int rc;
1042 int active;
1043 char *warn = NULL;
1044
1045 active = !!route;
1046
1047 LASSERT(active == (type != SOCKLND_CONN_NONE));
1048
1049 LIBCFS_ALLOC(conn, sizeof(*conn));
1050 if (!conn) {
1051 rc = -ENOMEM;
1052 goto failed_0;
1053 }
1054
1055 conn->ksnc_peer = NULL;
1056 conn->ksnc_route = NULL;
1057 conn->ksnc_sock = sock;
1058 /*
1059 * 2 ref, 1 for conn, another extra ref prevents socket
1060 * being closed before establishment of connection
1061 */
1062 atomic_set(&conn->ksnc_sock_refcount, 2);
1063 conn->ksnc_type = type;
1064 ksocknal_lib_save_callback(sock, conn);
1065 atomic_set(&conn->ksnc_conn_refcount, 1); /* 1 ref for me */
1066
1067 conn->ksnc_rx_ready = 0;
1068 conn->ksnc_rx_scheduled = 0;
1069
1070 INIT_LIST_HEAD(&conn->ksnc_tx_queue);
1071 conn->ksnc_tx_ready = 0;
1072 conn->ksnc_tx_scheduled = 0;
1073 conn->ksnc_tx_carrier = NULL;
1074 atomic_set(&conn->ksnc_tx_nob, 0);
1075
1076 LIBCFS_ALLOC(hello, offsetof(struct ksock_hello_msg,
1077 kshm_ips[LNET_MAX_INTERFACES]));
1078 if (!hello) {
1079 rc = -ENOMEM;
1080 goto failed_1;
1081 }
1082
1083 /* stash conn's local and remote addrs */
1084 rc = ksocknal_lib_get_conn_addrs(conn);
1085 if (rc)
1086 goto failed_1;
1087
1088 /*
1089 * Find out/confirm peer's NID and connection type and get the
1090 * vector of interfaces she's willing to let me connect to.
1091 * Passive connections use the listener timeout since the peer sends
1092 * eagerly
1093 */
1094 if (active) {
1095 peer = route->ksnr_peer;
1096 LASSERT(ni == peer->ksnp_ni);
1097
1098 /* Active connection sends HELLO eagerly */
1099 hello->kshm_nips = ksocknal_local_ipvec(ni, hello->kshm_ips);
1100 peerid = peer->ksnp_id;
1101
1102 write_lock_bh(global_lock);
1103 conn->ksnc_proto = peer->ksnp_proto;
1104 write_unlock_bh(global_lock);
1105
1106 if (!conn->ksnc_proto) {
1107 conn->ksnc_proto = &ksocknal_protocol_v3x;
1108 #if SOCKNAL_VERSION_DEBUG
1109 if (*ksocknal_tunables.ksnd_protocol == 2)
1110 conn->ksnc_proto = &ksocknal_protocol_v2x;
1111 else if (*ksocknal_tunables.ksnd_protocol == 1)
1112 conn->ksnc_proto = &ksocknal_protocol_v1x;
1113 #endif
1114 }
1115
1116 rc = ksocknal_send_hello(ni, conn, peerid.nid, hello);
1117 if (rc)
1118 goto failed_1;
1119 } else {
1120 peerid.nid = LNET_NID_ANY;
1121 peerid.pid = LNET_PID_ANY;
1122
1123 /* Passive, get protocol from peer */
1124 conn->ksnc_proto = NULL;
1125 }
1126
1127 rc = ksocknal_recv_hello(ni, conn, hello, &peerid, &incarnation);
1128 if (rc < 0)
1129 goto failed_1;
1130
1131 LASSERT(!rc || active);
1132 LASSERT(conn->ksnc_proto);
1133 LASSERT(peerid.nid != LNET_NID_ANY);
1134
1135 cpt = lnet_cpt_of_nid(peerid.nid);
1136
1137 if (active) {
1138 ksocknal_peer_addref(peer);
1139 write_lock_bh(global_lock);
1140 } else {
1141 rc = ksocknal_create_peer(&peer, ni, peerid);
1142 if (rc)
1143 goto failed_1;
1144
1145 write_lock_bh(global_lock);
1146
1147 /* called with a ref on ni, so shutdown can't have started */
1148 LASSERT(!((struct ksock_net *)ni->ni_data)->ksnn_shutdown);
1149
1150 peer2 = ksocknal_find_peer_locked(ni, peerid);
1151 if (!peer2) {
1152 /*
1153 * NB this puts an "empty" peer in the peer
1154 * table (which takes my ref)
1155 */
1156 list_add_tail(&peer->ksnp_list,
1157 ksocknal_nid2peerlist(peerid.nid));
1158 } else {
1159 ksocknal_peer_decref(peer);
1160 peer = peer2;
1161 }
1162
1163 /* +1 ref for me */
1164 ksocknal_peer_addref(peer);
1165 peer->ksnp_accepting++;
1166
1167 /*
1168 * Am I already connecting to this guy? Resolve in
1169 * favour of higher NID...
1170 */
1171 if (peerid.nid < ni->ni_nid &&
1172 ksocknal_connecting(peer, conn->ksnc_ipaddr)) {
1173 rc = EALREADY;
1174 warn = "connection race resolution";
1175 goto failed_2;
1176 }
1177 }
1178
1179 if (peer->ksnp_closing ||
1180 (active && route->ksnr_deleted)) {
1181 /* peer/route got closed under me */
1182 rc = -ESTALE;
1183 warn = "peer/route removed";
1184 goto failed_2;
1185 }
1186
1187 if (!peer->ksnp_proto) {
1188 /*
1189 * Never connected before.
1190 * NB recv_hello may have returned EPROTO to signal my peer
1191 * wants a different protocol than the one I asked for.
1192 */
1193 LASSERT(list_empty(&peer->ksnp_conns));
1194
1195 peer->ksnp_proto = conn->ksnc_proto;
1196 peer->ksnp_incarnation = incarnation;
1197 }
1198
1199 if (peer->ksnp_proto != conn->ksnc_proto ||
1200 peer->ksnp_incarnation != incarnation) {
1201 /* Peer rebooted or I've got the wrong protocol version */
1202 ksocknal_close_peer_conns_locked(peer, 0, 0);
1203
1204 peer->ksnp_proto = NULL;
1205 rc = ESTALE;
1206 warn = peer->ksnp_incarnation != incarnation ?
1207 "peer rebooted" :
1208 "wrong proto version";
1209 goto failed_2;
1210 }
1211
1212 switch (rc) {
1213 default:
1214 LBUG();
1215 case 0:
1216 break;
1217 case EALREADY:
1218 warn = "lost conn race";
1219 goto failed_2;
1220 case EPROTO:
1221 warn = "retry with different protocol version";
1222 goto failed_2;
1223 }
1224
1225 /*
1226 * Refuse to duplicate an existing connection, unless this is a
1227 * loopback connection
1228 */
1229 if (conn->ksnc_ipaddr != conn->ksnc_myipaddr) {
1230 list_for_each(tmp, &peer->ksnp_conns) {
1231 conn2 = list_entry(tmp, struct ksock_conn, ksnc_list);
1232
1233 if (conn2->ksnc_ipaddr != conn->ksnc_ipaddr ||
1234 conn2->ksnc_myipaddr != conn->ksnc_myipaddr ||
1235 conn2->ksnc_type != conn->ksnc_type)
1236 continue;
1237
1238 /*
1239 * Reply on a passive connection attempt so the peer
1240 * realises we're connected.
1241 */
1242 LASSERT(!rc);
1243 if (!active)
1244 rc = EALREADY;
1245
1246 warn = "duplicate";
1247 goto failed_2;
1248 }
1249 }
1250
1251 /*
1252 * If the connection created by this route didn't bind to the IP
1253 * address the route connected to, the connection/route matching
1254 * code below probably isn't going to work.
1255 */
1256 if (active &&
1257 route->ksnr_ipaddr != conn->ksnc_ipaddr) {
1258 CERROR("Route %s %pI4h connected to %pI4h\n",
1259 libcfs_id2str(peer->ksnp_id),
1260 &route->ksnr_ipaddr,
1261 &conn->ksnc_ipaddr);
1262 }
1263
1264 /*
1265 * Search for a route corresponding to the new connection and
1266 * create an association. This allows incoming connections created
1267 * by routes in my peer to match my own route entries so I don't
1268 * continually create duplicate routes.
1269 */
1270 list_for_each(tmp, &peer->ksnp_routes) {
1271 route = list_entry(tmp, struct ksock_route, ksnr_list);
1272
1273 if (route->ksnr_ipaddr != conn->ksnc_ipaddr)
1274 continue;
1275
1276 ksocknal_associate_route_conn_locked(route, conn);
1277 break;
1278 }
1279
1280 conn->ksnc_peer = peer; /* conn takes my ref on peer */
1281 peer->ksnp_last_alive = cfs_time_current();
1282 peer->ksnp_send_keepalive = 0;
1283 peer->ksnp_error = 0;
1284
1285 sched = ksocknal_choose_scheduler_locked(cpt);
1286 sched->kss_nconns++;
1287 conn->ksnc_scheduler = sched;
1288
1289 conn->ksnc_tx_last_post = cfs_time_current();
1290 /* Set the deadline for the outgoing HELLO to drain */
1291 conn->ksnc_tx_bufnob = sock->sk->sk_wmem_queued;
1292 conn->ksnc_tx_deadline = cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1293 mb(); /* order with adding to peer's conn list */
1294
1295 list_add(&conn->ksnc_list, &peer->ksnp_conns);
1296 ksocknal_conn_addref(conn);
1297
1298 ksocknal_new_packet(conn, 0);
1299
1300 conn->ksnc_zc_capable = ksocknal_lib_zc_capable(conn);
1301
1302 /* Take packets blocking for this connection. */
1303 list_for_each_entry_safe(tx, txtmp, &peer->ksnp_tx_queue, tx_list) {
1304 int match = conn->ksnc_proto->pro_match_tx(conn, tx,
1305 tx->tx_nonblk);
1306
1307 if (match == SOCKNAL_MATCH_NO)
1308 continue;
1309
1310 list_del(&tx->tx_list);
1311 ksocknal_queue_tx_locked(tx, conn);
1312 }
1313
1314 write_unlock_bh(global_lock);
1315
1316 /*
1317 * We've now got a new connection. Any errors from here on are just
1318 * like "normal" comms errors and we close the connection normally.
1319 * NB (a) we still have to send the reply HELLO for passive
1320 * connections,
1321 * (b) normal I/O on the conn is blocked until I setup and call the
1322 * socket callbacks.
1323 */
1324 CDEBUG(D_NET, "New conn %s p %d.x %pI4h -> %pI4h/%d incarnation:%lld sched[%d:%d]\n",
1325 libcfs_id2str(peerid), conn->ksnc_proto->pro_version,
1326 &conn->ksnc_myipaddr, &conn->ksnc_ipaddr,
1327 conn->ksnc_port, incarnation, cpt,
1328 (int)(sched - &sched->kss_info->ksi_scheds[0]));
1329
1330 if (active) {
1331 /* additional routes after interface exchange? */
1332 ksocknal_create_routes(peer, conn->ksnc_port,
1333 hello->kshm_ips, hello->kshm_nips);
1334 } else {
1335 hello->kshm_nips = ksocknal_select_ips(peer, hello->kshm_ips,
1336 hello->kshm_nips);
1337 rc = ksocknal_send_hello(ni, conn, peerid.nid, hello);
1338 }
1339
1340 LIBCFS_FREE(hello, offsetof(struct ksock_hello_msg,
1341 kshm_ips[LNET_MAX_INTERFACES]));
1342
1343 /*
1344 * setup the socket AFTER I've received hello (it disables
1345 * SO_LINGER). I might call back to the acceptor who may want
1346 * to send a protocol version response and then close the
1347 * socket; this ensures the socket only tears down after the
1348 * response has been sent.
1349 */
1350 if (!rc)
1351 rc = ksocknal_lib_setup_sock(sock);
1352
1353 write_lock_bh(global_lock);
1354
1355 /* NB my callbacks block while I hold ksnd_global_lock */
1356 ksocknal_lib_set_callback(sock, conn);
1357
1358 if (!active)
1359 peer->ksnp_accepting--;
1360
1361 write_unlock_bh(global_lock);
1362
1363 if (rc) {
1364 write_lock_bh(global_lock);
1365 if (!conn->ksnc_closing) {
1366 /* could be closed by another thread */
1367 ksocknal_close_conn_locked(conn, rc);
1368 }
1369 write_unlock_bh(global_lock);
1370 } else if (!ksocknal_connsock_addref(conn)) {
1371 /* Allow I/O to proceed. */
1372 ksocknal_read_callback(conn);
1373 ksocknal_write_callback(conn);
1374 ksocknal_connsock_decref(conn);
1375 }
1376
1377 ksocknal_connsock_decref(conn);
1378 ksocknal_conn_decref(conn);
1379 return rc;
1380
1381 failed_2:
1382 if (!peer->ksnp_closing &&
1383 list_empty(&peer->ksnp_conns) &&
1384 list_empty(&peer->ksnp_routes)) {
1385 list_add(&zombies, &peer->ksnp_tx_queue);
1386 list_del_init(&peer->ksnp_tx_queue);
1387 ksocknal_unlink_peer_locked(peer);
1388 }
1389
1390 write_unlock_bh(global_lock);
1391
1392 if (warn) {
1393 if (rc < 0)
1394 CERROR("Not creating conn %s type %d: %s\n",
1395 libcfs_id2str(peerid), conn->ksnc_type, warn);
1396 else
1397 CDEBUG(D_NET, "Not creating conn %s type %d: %s\n",
1398 libcfs_id2str(peerid), conn->ksnc_type, warn);
1399 }
1400
1401 if (!active) {
1402 if (rc > 0) {
1403 /*
1404 * Request retry by replying with CONN_NONE
1405 * ksnc_proto has been set already
1406 */
1407 conn->ksnc_type = SOCKLND_CONN_NONE;
1408 hello->kshm_nips = 0;
1409 ksocknal_send_hello(ni, conn, peerid.nid, hello);
1410 }
1411
1412 write_lock_bh(global_lock);
1413 peer->ksnp_accepting--;
1414 write_unlock_bh(global_lock);
1415 }
1416
1417 ksocknal_txlist_done(ni, &zombies, 1);
1418 ksocknal_peer_decref(peer);
1419
1420 failed_1:
1421 if (hello)
1422 LIBCFS_FREE(hello, offsetof(struct ksock_hello_msg,
1423 kshm_ips[LNET_MAX_INTERFACES]));
1424
1425 LIBCFS_FREE(conn, sizeof(*conn));
1426
1427 failed_0:
1428 sock_release(sock);
1429 return rc;
1430 }
1431
1432 void
1433 ksocknal_close_conn_locked(struct ksock_conn *conn, int error)
1434 {
1435 /*
1436 * This just does the immmediate housekeeping, and queues the
1437 * connection for the reaper to terminate.
1438 * Caller holds ksnd_global_lock exclusively in irq context
1439 */
1440 struct ksock_peer *peer = conn->ksnc_peer;
1441 struct ksock_route *route;
1442 struct ksock_conn *conn2;
1443 struct list_head *tmp;
1444
1445 LASSERT(!peer->ksnp_error);
1446 LASSERT(!conn->ksnc_closing);
1447 conn->ksnc_closing = 1;
1448
1449 /* ksnd_deathrow_conns takes over peer's ref */
1450 list_del(&conn->ksnc_list);
1451
1452 route = conn->ksnc_route;
1453 if (route) {
1454 /* dissociate conn from route... */
1455 LASSERT(!route->ksnr_deleted);
1456 LASSERT(route->ksnr_connected & (1 << conn->ksnc_type));
1457
1458 conn2 = NULL;
1459 list_for_each(tmp, &peer->ksnp_conns) {
1460 conn2 = list_entry(tmp, struct ksock_conn, ksnc_list);
1461
1462 if (conn2->ksnc_route == route &&
1463 conn2->ksnc_type == conn->ksnc_type)
1464 break;
1465
1466 conn2 = NULL;
1467 }
1468 if (!conn2)
1469 route->ksnr_connected &= ~(1 << conn->ksnc_type);
1470
1471 conn->ksnc_route = NULL;
1472
1473 ksocknal_route_decref(route); /* drop conn's ref on route */
1474 }
1475
1476 if (list_empty(&peer->ksnp_conns)) {
1477 /* No more connections to this peer */
1478
1479 if (!list_empty(&peer->ksnp_tx_queue)) {
1480 struct ksock_tx *tx;
1481
1482 LASSERT(conn->ksnc_proto == &ksocknal_protocol_v3x);
1483
1484 /*
1485 * throw them to the last connection...,
1486 * these TXs will be send to /dev/null by scheduler
1487 */
1488 list_for_each_entry(tx, &peer->ksnp_tx_queue,
1489 tx_list)
1490 ksocknal_tx_prep(conn, tx);
1491
1492 spin_lock_bh(&conn->ksnc_scheduler->kss_lock);
1493 list_splice_init(&peer->ksnp_tx_queue,
1494 &conn->ksnc_tx_queue);
1495 spin_unlock_bh(&conn->ksnc_scheduler->kss_lock);
1496 }
1497
1498 peer->ksnp_proto = NULL; /* renegotiate protocol version */
1499 peer->ksnp_error = error; /* stash last conn close reason */
1500
1501 if (list_empty(&peer->ksnp_routes)) {
1502 /*
1503 * I've just closed last conn belonging to a
1504 * peer with no routes to it
1505 */
1506 ksocknal_unlink_peer_locked(peer);
1507 }
1508 }
1509
1510 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1511
1512 list_add_tail(&conn->ksnc_list,
1513 &ksocknal_data.ksnd_deathrow_conns);
1514 wake_up(&ksocknal_data.ksnd_reaper_waitq);
1515
1516 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1517 }
1518
1519 void
1520 ksocknal_peer_failed(struct ksock_peer *peer)
1521 {
1522 int notify = 0;
1523 unsigned long last_alive = 0;
1524
1525 /*
1526 * There has been a connection failure or comms error; but I'll only
1527 * tell LNET I think the peer is dead if it's to another kernel and
1528 * there are no connections or connection attempts in existence.
1529 */
1530 read_lock(&ksocknal_data.ksnd_global_lock);
1531
1532 if (!(peer->ksnp_id.pid & LNET_PID_USERFLAG) &&
1533 list_empty(&peer->ksnp_conns) &&
1534 !peer->ksnp_accepting &&
1535 !ksocknal_find_connecting_route_locked(peer)) {
1536 notify = 1;
1537 last_alive = peer->ksnp_last_alive;
1538 }
1539
1540 read_unlock(&ksocknal_data.ksnd_global_lock);
1541
1542 if (notify)
1543 lnet_notify(peer->ksnp_ni, peer->ksnp_id.nid, 0,
1544 last_alive);
1545 }
1546
1547 void
1548 ksocknal_finalize_zcreq(struct ksock_conn *conn)
1549 {
1550 struct ksock_peer *peer = conn->ksnc_peer;
1551 struct ksock_tx *tx;
1552 struct ksock_tx *temp;
1553 struct ksock_tx *tmp;
1554 LIST_HEAD(zlist);
1555
1556 /*
1557 * NB safe to finalize TXs because closing of socket will
1558 * abort all buffered data
1559 */
1560 LASSERT(!conn->ksnc_sock);
1561
1562 spin_lock(&peer->ksnp_lock);
1563
1564 list_for_each_entry_safe(tx, tmp, &peer->ksnp_zc_req_list, tx_zc_list) {
1565 if (tx->tx_conn != conn)
1566 continue;
1567
1568 LASSERT(tx->tx_msg.ksm_zc_cookies[0]);
1569
1570 tx->tx_msg.ksm_zc_cookies[0] = 0;
1571 tx->tx_zc_aborted = 1; /* mark it as not-acked */
1572 list_del(&tx->tx_zc_list);
1573 list_add(&tx->tx_zc_list, &zlist);
1574 }
1575
1576 spin_unlock(&peer->ksnp_lock);
1577
1578 list_for_each_entry_safe(tx, temp, &zlist, tx_zc_list) {
1579 list_del(&tx->tx_zc_list);
1580 ksocknal_tx_decref(tx);
1581 }
1582 }
1583
1584 void
1585 ksocknal_terminate_conn(struct ksock_conn *conn)
1586 {
1587 /*
1588 * This gets called by the reaper (guaranteed thread context) to
1589 * disengage the socket from its callbacks and close it.
1590 * ksnc_refcount will eventually hit zero, and then the reaper will
1591 * destroy it.
1592 */
1593 struct ksock_peer *peer = conn->ksnc_peer;
1594 struct ksock_sched *sched = conn->ksnc_scheduler;
1595 int failed = 0;
1596
1597 LASSERT(conn->ksnc_closing);
1598
1599 /* wake up the scheduler to "send" all remaining packets to /dev/null */
1600 spin_lock_bh(&sched->kss_lock);
1601
1602 /* a closing conn is always ready to tx */
1603 conn->ksnc_tx_ready = 1;
1604
1605 if (!conn->ksnc_tx_scheduled &&
1606 !list_empty(&conn->ksnc_tx_queue)) {
1607 list_add_tail(&conn->ksnc_tx_list,
1608 &sched->kss_tx_conns);
1609 conn->ksnc_tx_scheduled = 1;
1610 /* extra ref for scheduler */
1611 ksocknal_conn_addref(conn);
1612
1613 wake_up(&sched->kss_waitq);
1614 }
1615
1616 spin_unlock_bh(&sched->kss_lock);
1617
1618 /* serialise with callbacks */
1619 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1620
1621 ksocknal_lib_reset_callback(conn->ksnc_sock, conn);
1622
1623 /*
1624 * OK, so this conn may not be completely disengaged from its
1625 * scheduler yet, but it _has_ committed to terminate...
1626 */
1627 conn->ksnc_scheduler->kss_nconns--;
1628
1629 if (peer->ksnp_error) {
1630 /* peer's last conn closed in error */
1631 LASSERT(list_empty(&peer->ksnp_conns));
1632 failed = 1;
1633 peer->ksnp_error = 0; /* avoid multiple notifications */
1634 }
1635
1636 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1637
1638 if (failed)
1639 ksocknal_peer_failed(peer);
1640
1641 /*
1642 * The socket is closed on the final put; either here, or in
1643 * ksocknal_{send,recv}msg(). Since we set up the linger2 option
1644 * when the connection was established, this will close the socket
1645 * immediately, aborting anything buffered in it. Any hung
1646 * zero-copy transmits will therefore complete in finite time.
1647 */
1648 ksocknal_connsock_decref(conn);
1649 }
1650
1651 void
1652 ksocknal_queue_zombie_conn(struct ksock_conn *conn)
1653 {
1654 /* Queue the conn for the reaper to destroy */
1655
1656 LASSERT(!atomic_read(&conn->ksnc_conn_refcount));
1657 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1658
1659 list_add_tail(&conn->ksnc_list, &ksocknal_data.ksnd_zombie_conns);
1660 wake_up(&ksocknal_data.ksnd_reaper_waitq);
1661
1662 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1663 }
1664
1665 void
1666 ksocknal_destroy_conn(struct ksock_conn *conn)
1667 {
1668 unsigned long last_rcv;
1669
1670 /* Final coup-de-grace of the reaper */
1671 CDEBUG(D_NET, "connection %p\n", conn);
1672
1673 LASSERT(!atomic_read(&conn->ksnc_conn_refcount));
1674 LASSERT(!atomic_read(&conn->ksnc_sock_refcount));
1675 LASSERT(!conn->ksnc_sock);
1676 LASSERT(!conn->ksnc_route);
1677 LASSERT(!conn->ksnc_tx_scheduled);
1678 LASSERT(!conn->ksnc_rx_scheduled);
1679 LASSERT(list_empty(&conn->ksnc_tx_queue));
1680
1681 /* complete current receive if any */
1682 switch (conn->ksnc_rx_state) {
1683 case SOCKNAL_RX_LNET_PAYLOAD:
1684 last_rcv = conn->ksnc_rx_deadline -
1685 cfs_time_seconds(*ksocknal_tunables.ksnd_timeout);
1686 CERROR("Completing partial receive from %s[%d], ip %pI4h:%d, with error, wanted: %zd, left: %d, last alive is %ld secs ago\n",
1687 libcfs_id2str(conn->ksnc_peer->ksnp_id), conn->ksnc_type,
1688 &conn->ksnc_ipaddr, conn->ksnc_port,
1689 iov_iter_count(&conn->ksnc_rx_to), conn->ksnc_rx_nob_left,
1690 cfs_duration_sec(cfs_time_sub(cfs_time_current(),
1691 last_rcv)));
1692 lnet_finalize(conn->ksnc_peer->ksnp_ni,
1693 conn->ksnc_cookie, -EIO);
1694 break;
1695 case SOCKNAL_RX_LNET_HEADER:
1696 if (conn->ksnc_rx_started)
1697 CERROR("Incomplete receive of lnet header from %s, ip %pI4h:%d, with error, protocol: %d.x.\n",
1698 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1699 &conn->ksnc_ipaddr, conn->ksnc_port,
1700 conn->ksnc_proto->pro_version);
1701 break;
1702 case SOCKNAL_RX_KSM_HEADER:
1703 if (conn->ksnc_rx_started)
1704 CERROR("Incomplete receive of ksock message from %s, ip %pI4h:%d, with error, protocol: %d.x.\n",
1705 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1706 &conn->ksnc_ipaddr, conn->ksnc_port,
1707 conn->ksnc_proto->pro_version);
1708 break;
1709 case SOCKNAL_RX_SLOP:
1710 if (conn->ksnc_rx_started)
1711 CERROR("Incomplete receive of slops from %s, ip %pI4h:%d, with error\n",
1712 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1713 &conn->ksnc_ipaddr, conn->ksnc_port);
1714 break;
1715 default:
1716 LBUG();
1717 break;
1718 }
1719
1720 ksocknal_peer_decref(conn->ksnc_peer);
1721
1722 LIBCFS_FREE(conn, sizeof(*conn));
1723 }
1724
1725 int
1726 ksocknal_close_peer_conns_locked(struct ksock_peer *peer, __u32 ipaddr, int why)
1727 {
1728 struct ksock_conn *conn;
1729 struct list_head *ctmp;
1730 struct list_head *cnxt;
1731 int count = 0;
1732
1733 list_for_each_safe(ctmp, cnxt, &peer->ksnp_conns) {
1734 conn = list_entry(ctmp, struct ksock_conn, ksnc_list);
1735
1736 if (!ipaddr || conn->ksnc_ipaddr == ipaddr) {
1737 count++;
1738 ksocknal_close_conn_locked(conn, why);
1739 }
1740 }
1741
1742 return count;
1743 }
1744
1745 int
1746 ksocknal_close_conn_and_siblings(struct ksock_conn *conn, int why)
1747 {
1748 struct ksock_peer *peer = conn->ksnc_peer;
1749 __u32 ipaddr = conn->ksnc_ipaddr;
1750 int count;
1751
1752 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1753
1754 count = ksocknal_close_peer_conns_locked(peer, ipaddr, why);
1755
1756 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1757
1758 return count;
1759 }
1760
1761 int
1762 ksocknal_close_matching_conns(struct lnet_process_id id, __u32 ipaddr)
1763 {
1764 struct ksock_peer *peer;
1765 struct list_head *ptmp;
1766 struct list_head *pnxt;
1767 int lo;
1768 int hi;
1769 int i;
1770 int count = 0;
1771
1772 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1773
1774 if (id.nid != LNET_NID_ANY) {
1775 lo = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
1776 hi = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
1777 } else {
1778 lo = 0;
1779 hi = ksocknal_data.ksnd_peer_hash_size - 1;
1780 }
1781
1782 for (i = lo; i <= hi; i++) {
1783 list_for_each_safe(ptmp, pnxt,
1784 &ksocknal_data.ksnd_peers[i]) {
1785 peer = list_entry(ptmp, struct ksock_peer, ksnp_list);
1786
1787 if (!((id.nid == LNET_NID_ANY || id.nid == peer->ksnp_id.nid) &&
1788 (id.pid == LNET_PID_ANY || id.pid == peer->ksnp_id.pid)))
1789 continue;
1790
1791 count += ksocknal_close_peer_conns_locked(peer, ipaddr,
1792 0);
1793 }
1794 }
1795
1796 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1797
1798 /* wildcards always succeed */
1799 if (id.nid == LNET_NID_ANY || id.pid == LNET_PID_ANY || !ipaddr)
1800 return 0;
1801
1802 if (!count)
1803 return -ENOENT;
1804 else
1805 return 0;
1806 }
1807
1808 void
1809 ksocknal_notify(struct lnet_ni *ni, lnet_nid_t gw_nid, int alive)
1810 {
1811 /*
1812 * The router is telling me she's been notified of a change in
1813 * gateway state....
1814 */
1815 struct lnet_process_id id = {0};
1816
1817 id.nid = gw_nid;
1818 id.pid = LNET_PID_ANY;
1819
1820 CDEBUG(D_NET, "gw %s %s\n", libcfs_nid2str(gw_nid),
1821 alive ? "up" : "down");
1822
1823 if (!alive) {
1824 /* If the gateway crashed, close all open connections... */
1825 ksocknal_close_matching_conns(id, 0);
1826 return;
1827 }
1828
1829 /*
1830 * ...otherwise do nothing. We can only establish new connections
1831 * if we have autroutes, and these connect on demand.
1832 */
1833 }
1834
1835 void
1836 ksocknal_query(struct lnet_ni *ni, lnet_nid_t nid, unsigned long *when)
1837 {
1838 int connect = 1;
1839 unsigned long last_alive = 0;
1840 unsigned long now = cfs_time_current();
1841 struct ksock_peer *peer = NULL;
1842 rwlock_t *glock = &ksocknal_data.ksnd_global_lock;
1843 struct lnet_process_id id = {
1844 .nid = nid,
1845 .pid = LNET_PID_LUSTRE,
1846 };
1847
1848 read_lock(glock);
1849
1850 peer = ksocknal_find_peer_locked(ni, id);
1851 if (peer) {
1852 struct ksock_conn *conn;
1853 int bufnob;
1854
1855 list_for_each_entry(conn, &peer->ksnp_conns, ksnc_list) {
1856 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
1857
1858 if (bufnob < conn->ksnc_tx_bufnob) {
1859 /* something got ACKed */
1860 conn->ksnc_tx_deadline =
1861 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1862 peer->ksnp_last_alive = now;
1863 conn->ksnc_tx_bufnob = bufnob;
1864 }
1865 }
1866
1867 last_alive = peer->ksnp_last_alive;
1868 if (!ksocknal_find_connectable_route_locked(peer))
1869 connect = 0;
1870 }
1871
1872 read_unlock(glock);
1873
1874 if (last_alive)
1875 *when = last_alive;
1876
1877 CDEBUG(D_NET, "Peer %s %p, alive %ld secs ago, connect %d\n",
1878 libcfs_nid2str(nid), peer,
1879 last_alive ? cfs_duration_sec(now - last_alive) : -1,
1880 connect);
1881
1882 if (!connect)
1883 return;
1884
1885 ksocknal_add_peer(ni, id, LNET_NIDADDR(nid), lnet_acceptor_port());
1886
1887 write_lock_bh(glock);
1888
1889 peer = ksocknal_find_peer_locked(ni, id);
1890 if (peer)
1891 ksocknal_launch_all_connections_locked(peer);
1892
1893 write_unlock_bh(glock);
1894 }
1895
1896 static void
1897 ksocknal_push_peer(struct ksock_peer *peer)
1898 {
1899 int index;
1900 int i;
1901 struct list_head *tmp;
1902 struct ksock_conn *conn;
1903
1904 for (index = 0; ; index++) {
1905 read_lock(&ksocknal_data.ksnd_global_lock);
1906
1907 i = 0;
1908 conn = NULL;
1909
1910 list_for_each(tmp, &peer->ksnp_conns) {
1911 if (i++ == index) {
1912 conn = list_entry(tmp, struct ksock_conn,
1913 ksnc_list);
1914 ksocknal_conn_addref(conn);
1915 break;
1916 }
1917 }
1918
1919 read_unlock(&ksocknal_data.ksnd_global_lock);
1920
1921 if (!conn)
1922 break;
1923
1924 ksocknal_lib_push_conn(conn);
1925 ksocknal_conn_decref(conn);
1926 }
1927 }
1928
1929 static int ksocknal_push(struct lnet_ni *ni, struct lnet_process_id id)
1930 {
1931 struct list_head *start;
1932 struct list_head *end;
1933 struct list_head *tmp;
1934 int rc = -ENOENT;
1935 unsigned int hsize = ksocknal_data.ksnd_peer_hash_size;
1936
1937 if (id.nid == LNET_NID_ANY) {
1938 start = &ksocknal_data.ksnd_peers[0];
1939 end = &ksocknal_data.ksnd_peers[hsize - 1];
1940 } else {
1941 start = ksocknal_nid2peerlist(id.nid);
1942 end = ksocknal_nid2peerlist(id.nid);
1943 }
1944
1945 for (tmp = start; tmp <= end; tmp++) {
1946 int peer_off; /* searching offset in peer hash table */
1947
1948 for (peer_off = 0; ; peer_off++) {
1949 struct ksock_peer *peer;
1950 int i = 0;
1951
1952 read_lock(&ksocknal_data.ksnd_global_lock);
1953 list_for_each_entry(peer, tmp, ksnp_list) {
1954 if (!((id.nid == LNET_NID_ANY ||
1955 id.nid == peer->ksnp_id.nid) &&
1956 (id.pid == LNET_PID_ANY ||
1957 id.pid == peer->ksnp_id.pid)))
1958 continue;
1959
1960 if (i++ == peer_off) {
1961 ksocknal_peer_addref(peer);
1962 break;
1963 }
1964 }
1965 read_unlock(&ksocknal_data.ksnd_global_lock);
1966
1967 if (!i) /* no match */
1968 break;
1969
1970 rc = 0;
1971 ksocknal_push_peer(peer);
1972 ksocknal_peer_decref(peer);
1973 }
1974 }
1975 return rc;
1976 }
1977
1978 static int
1979 ksocknal_add_interface(struct lnet_ni *ni, __u32 ipaddress, __u32 netmask)
1980 {
1981 struct ksock_net *net = ni->ni_data;
1982 struct ksock_interface *iface;
1983 int rc;
1984 int i;
1985 int j;
1986 struct list_head *ptmp;
1987 struct ksock_peer *peer;
1988 struct list_head *rtmp;
1989 struct ksock_route *route;
1990
1991 if (!ipaddress || !netmask)
1992 return -EINVAL;
1993
1994 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1995
1996 iface = ksocknal_ip2iface(ni, ipaddress);
1997 if (iface) {
1998 /* silently ignore dups */
1999 rc = 0;
2000 } else if (net->ksnn_ninterfaces == LNET_MAX_INTERFACES) {
2001 rc = -ENOSPC;
2002 } else {
2003 iface = &net->ksnn_interfaces[net->ksnn_ninterfaces++];
2004
2005 iface->ksni_ipaddr = ipaddress;
2006 iface->ksni_netmask = netmask;
2007 iface->ksni_nroutes = 0;
2008 iface->ksni_npeers = 0;
2009
2010 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2011 list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
2012 peer = list_entry(ptmp, struct ksock_peer,
2013 ksnp_list);
2014
2015 for (j = 0; j < peer->ksnp_n_passive_ips; j++)
2016 if (peer->ksnp_passive_ips[j] == ipaddress)
2017 iface->ksni_npeers++;
2018
2019 list_for_each(rtmp, &peer->ksnp_routes) {
2020 route = list_entry(rtmp, struct ksock_route,
2021 ksnr_list);
2022
2023 if (route->ksnr_myipaddr == ipaddress)
2024 iface->ksni_nroutes++;
2025 }
2026 }
2027 }
2028
2029 rc = 0;
2030 /*
2031 * NB only new connections will pay attention to the
2032 * new interface!
2033 */
2034 }
2035
2036 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2037
2038 return rc;
2039 }
2040
2041 static void
2042 ksocknal_peer_del_interface_locked(struct ksock_peer *peer, __u32 ipaddr)
2043 {
2044 struct list_head *tmp;
2045 struct list_head *nxt;
2046 struct ksock_route *route;
2047 struct ksock_conn *conn;
2048 int i;
2049 int j;
2050
2051 for (i = 0; i < peer->ksnp_n_passive_ips; i++)
2052 if (peer->ksnp_passive_ips[i] == ipaddr) {
2053 for (j = i + 1; j < peer->ksnp_n_passive_ips; j++)
2054 peer->ksnp_passive_ips[j - 1] =
2055 peer->ksnp_passive_ips[j];
2056 peer->ksnp_n_passive_ips--;
2057 break;
2058 }
2059
2060 list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
2061 route = list_entry(tmp, struct ksock_route, ksnr_list);
2062
2063 if (route->ksnr_myipaddr != ipaddr)
2064 continue;
2065
2066 if (route->ksnr_share_count) {
2067 /* Manually created; keep, but unbind */
2068 route->ksnr_myipaddr = 0;
2069 } else {
2070 ksocknal_del_route_locked(route);
2071 }
2072 }
2073
2074 list_for_each_safe(tmp, nxt, &peer->ksnp_conns) {
2075 conn = list_entry(tmp, struct ksock_conn, ksnc_list);
2076
2077 if (conn->ksnc_myipaddr == ipaddr)
2078 ksocknal_close_conn_locked(conn, 0);
2079 }
2080 }
2081
2082 static int
2083 ksocknal_del_interface(struct lnet_ni *ni, __u32 ipaddress)
2084 {
2085 struct ksock_net *net = ni->ni_data;
2086 int rc = -ENOENT;
2087 struct list_head *tmp;
2088 struct list_head *nxt;
2089 struct ksock_peer *peer;
2090 __u32 this_ip;
2091 int i;
2092 int j;
2093
2094 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2095
2096 for (i = 0; i < net->ksnn_ninterfaces; i++) {
2097 this_ip = net->ksnn_interfaces[i].ksni_ipaddr;
2098
2099 if (!(!ipaddress || ipaddress == this_ip))
2100 continue;
2101
2102 rc = 0;
2103
2104 for (j = i + 1; j < net->ksnn_ninterfaces; j++)
2105 net->ksnn_interfaces[j - 1] =
2106 net->ksnn_interfaces[j];
2107
2108 net->ksnn_ninterfaces--;
2109
2110 for (j = 0; j < ksocknal_data.ksnd_peer_hash_size; j++) {
2111 list_for_each_safe(tmp, nxt,
2112 &ksocknal_data.ksnd_peers[j]) {
2113 peer = list_entry(tmp, struct ksock_peer, ksnp_list);
2114
2115 if (peer->ksnp_ni != ni)
2116 continue;
2117
2118 ksocknal_peer_del_interface_locked(peer, this_ip);
2119 }
2120 }
2121 }
2122
2123 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2124
2125 return rc;
2126 }
2127
2128 int
2129 ksocknal_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
2130 {
2131 struct lnet_process_id id = {0};
2132 struct libcfs_ioctl_data *data = arg;
2133 int rc;
2134
2135 switch (cmd) {
2136 case IOC_LIBCFS_GET_INTERFACE: {
2137 struct ksock_net *net = ni->ni_data;
2138 struct ksock_interface *iface;
2139
2140 read_lock(&ksocknal_data.ksnd_global_lock);
2141
2142 if (data->ioc_count >= (__u32)net->ksnn_ninterfaces) {
2143 rc = -ENOENT;
2144 } else {
2145 rc = 0;
2146 iface = &net->ksnn_interfaces[data->ioc_count];
2147
2148 data->ioc_u32[0] = iface->ksni_ipaddr;
2149 data->ioc_u32[1] = iface->ksni_netmask;
2150 data->ioc_u32[2] = iface->ksni_npeers;
2151 data->ioc_u32[3] = iface->ksni_nroutes;
2152 }
2153
2154 read_unlock(&ksocknal_data.ksnd_global_lock);
2155 return rc;
2156 }
2157
2158 case IOC_LIBCFS_ADD_INTERFACE:
2159 return ksocknal_add_interface(ni,
2160 data->ioc_u32[0], /* IP address */
2161 data->ioc_u32[1]); /* net mask */
2162
2163 case IOC_LIBCFS_DEL_INTERFACE:
2164 return ksocknal_del_interface(ni,
2165 data->ioc_u32[0]); /* IP address */
2166
2167 case IOC_LIBCFS_GET_PEER: {
2168 __u32 myip = 0;
2169 __u32 ip = 0;
2170 int port = 0;
2171 int conn_count = 0;
2172 int share_count = 0;
2173
2174 rc = ksocknal_get_peer_info(ni, data->ioc_count,
2175 &id, &myip, &ip, &port,
2176 &conn_count, &share_count);
2177 if (rc)
2178 return rc;
2179
2180 data->ioc_nid = id.nid;
2181 data->ioc_count = share_count;
2182 data->ioc_u32[0] = ip;
2183 data->ioc_u32[1] = port;
2184 data->ioc_u32[2] = myip;
2185 data->ioc_u32[3] = conn_count;
2186 data->ioc_u32[4] = id.pid;
2187 return 0;
2188 }
2189
2190 case IOC_LIBCFS_ADD_PEER:
2191 id.nid = data->ioc_nid;
2192 id.pid = LNET_PID_LUSTRE;
2193 return ksocknal_add_peer(ni, id,
2194 data->ioc_u32[0], /* IP */
2195 data->ioc_u32[1]); /* port */
2196
2197 case IOC_LIBCFS_DEL_PEER:
2198 id.nid = data->ioc_nid;
2199 id.pid = LNET_PID_ANY;
2200 return ksocknal_del_peer(ni, id,
2201 data->ioc_u32[0]); /* IP */
2202
2203 case IOC_LIBCFS_GET_CONN: {
2204 int txmem;
2205 int rxmem;
2206 int nagle;
2207 struct ksock_conn *conn;
2208
2209 conn = ksocknal_get_conn_by_idx(ni, data->ioc_count);
2210 if (!conn)
2211 return -ENOENT;
2212
2213 ksocknal_lib_get_conn_tunables(conn, &txmem, &rxmem, &nagle);
2214
2215 data->ioc_count = txmem;
2216 data->ioc_nid = conn->ksnc_peer->ksnp_id.nid;
2217 data->ioc_flags = nagle;
2218 data->ioc_u32[0] = conn->ksnc_ipaddr;
2219 data->ioc_u32[1] = conn->ksnc_port;
2220 data->ioc_u32[2] = conn->ksnc_myipaddr;
2221 data->ioc_u32[3] = conn->ksnc_type;
2222 data->ioc_u32[4] = conn->ksnc_scheduler->kss_info->ksi_cpt;
2223 data->ioc_u32[5] = rxmem;
2224 data->ioc_u32[6] = conn->ksnc_peer->ksnp_id.pid;
2225 ksocknal_conn_decref(conn);
2226 return 0;
2227 }
2228
2229 case IOC_LIBCFS_CLOSE_CONNECTION:
2230 id.nid = data->ioc_nid;
2231 id.pid = LNET_PID_ANY;
2232 return ksocknal_close_matching_conns(id,
2233 data->ioc_u32[0]);
2234
2235 case IOC_LIBCFS_REGISTER_MYNID:
2236 /* Ignore if this is a noop */
2237 if (data->ioc_nid == ni->ni_nid)
2238 return 0;
2239
2240 CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
2241 libcfs_nid2str(data->ioc_nid),
2242 libcfs_nid2str(ni->ni_nid));
2243 return -EINVAL;
2244
2245 case IOC_LIBCFS_PUSH_CONNECTION:
2246 id.nid = data->ioc_nid;
2247 id.pid = LNET_PID_ANY;
2248 return ksocknal_push(ni, id);
2249
2250 default:
2251 return -EINVAL;
2252 }
2253 /* not reached */
2254 }
2255
2256 static void
2257 ksocknal_free_buffers(void)
2258 {
2259 LASSERT(!atomic_read(&ksocknal_data.ksnd_nactive_txs));
2260
2261 if (ksocknal_data.ksnd_sched_info) {
2262 struct ksock_sched_info *info;
2263 int i;
2264
2265 cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2266 if (info->ksi_scheds) {
2267 LIBCFS_FREE(info->ksi_scheds,
2268 info->ksi_nthreads_max *
2269 sizeof(info->ksi_scheds[0]));
2270 }
2271 }
2272 cfs_percpt_free(ksocknal_data.ksnd_sched_info);
2273 }
2274
2275 LIBCFS_FREE(ksocknal_data.ksnd_peers,
2276 sizeof(struct list_head) *
2277 ksocknal_data.ksnd_peer_hash_size);
2278
2279 spin_lock(&ksocknal_data.ksnd_tx_lock);
2280
2281 if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
2282 struct list_head zlist;
2283 struct ksock_tx *tx;
2284 struct ksock_tx *temp;
2285
2286 list_add(&zlist, &ksocknal_data.ksnd_idle_noop_txs);
2287 list_del_init(&ksocknal_data.ksnd_idle_noop_txs);
2288 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2289
2290 list_for_each_entry_safe(tx, temp, &zlist, tx_list) {
2291 list_del(&tx->tx_list);
2292 LIBCFS_FREE(tx, tx->tx_desc_size);
2293 }
2294 } else {
2295 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2296 }
2297 }
2298
2299 static void
2300 ksocknal_base_shutdown(void)
2301 {
2302 struct ksock_sched_info *info;
2303 struct ksock_sched *sched;
2304 int i;
2305 int j;
2306
2307 LASSERT(!ksocknal_data.ksnd_nnets);
2308
2309 switch (ksocknal_data.ksnd_init) {
2310 default:
2311 LASSERT(0);
2312 /* fall through */
2313 case SOCKNAL_INIT_ALL:
2314 case SOCKNAL_INIT_DATA:
2315 LASSERT(ksocknal_data.ksnd_peers);
2316 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++)
2317 LASSERT(list_empty(&ksocknal_data.ksnd_peers[i]));
2318
2319 LASSERT(list_empty(&ksocknal_data.ksnd_nets));
2320 LASSERT(list_empty(&ksocknal_data.ksnd_enomem_conns));
2321 LASSERT(list_empty(&ksocknal_data.ksnd_zombie_conns));
2322 LASSERT(list_empty(&ksocknal_data.ksnd_connd_connreqs));
2323 LASSERT(list_empty(&ksocknal_data.ksnd_connd_routes));
2324
2325 if (ksocknal_data.ksnd_sched_info) {
2326 cfs_percpt_for_each(info, i,
2327 ksocknal_data.ksnd_sched_info) {
2328 if (!info->ksi_scheds)
2329 continue;
2330
2331 for (j = 0; j < info->ksi_nthreads_max; j++) {
2332 sched = &info->ksi_scheds[j];
2333 LASSERT(list_empty(
2334 &sched->kss_tx_conns));
2335 LASSERT(list_empty(
2336 &sched->kss_rx_conns));
2337 LASSERT(list_empty(
2338 &sched->kss_zombie_noop_txs));
2339 LASSERT(!sched->kss_nconns);
2340 }
2341 }
2342 }
2343
2344 /* flag threads to terminate; wake and wait for them to die */
2345 ksocknal_data.ksnd_shuttingdown = 1;
2346 wake_up_all(&ksocknal_data.ksnd_connd_waitq);
2347 wake_up_all(&ksocknal_data.ksnd_reaper_waitq);
2348
2349 if (ksocknal_data.ksnd_sched_info) {
2350 cfs_percpt_for_each(info, i,
2351 ksocknal_data.ksnd_sched_info) {
2352 if (!info->ksi_scheds)
2353 continue;
2354
2355 for (j = 0; j < info->ksi_nthreads_max; j++) {
2356 sched = &info->ksi_scheds[j];
2357 wake_up_all(&sched->kss_waitq);
2358 }
2359 }
2360 }
2361
2362 i = 4;
2363 read_lock(&ksocknal_data.ksnd_global_lock);
2364 while (ksocknal_data.ksnd_nthreads) {
2365 i++;
2366 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2367 "waiting for %d threads to terminate\n",
2368 ksocknal_data.ksnd_nthreads);
2369 read_unlock(&ksocknal_data.ksnd_global_lock);
2370 set_current_state(TASK_UNINTERRUPTIBLE);
2371 schedule_timeout(cfs_time_seconds(1));
2372 read_lock(&ksocknal_data.ksnd_global_lock);
2373 }
2374 read_unlock(&ksocknal_data.ksnd_global_lock);
2375
2376 ksocknal_free_buffers();
2377
2378 ksocknal_data.ksnd_init = SOCKNAL_INIT_NOTHING;
2379 break;
2380 }
2381
2382 module_put(THIS_MODULE);
2383 }
2384
2385 static __u64
2386 ksocknal_new_incarnation(void)
2387 {
2388 /* The incarnation number is the time this module loaded and it
2389 * identifies this particular instance of the socknal.
2390 */
2391 return ktime_get_ns();
2392 }
2393
2394 static int
2395 ksocknal_base_startup(void)
2396 {
2397 struct ksock_sched_info *info;
2398 int rc;
2399 int i;
2400
2401 LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING);
2402 LASSERT(!ksocknal_data.ksnd_nnets);
2403
2404 memset(&ksocknal_data, 0, sizeof(ksocknal_data)); /* zero pointers */
2405
2406 ksocknal_data.ksnd_peer_hash_size = SOCKNAL_PEER_HASH_SIZE;
2407 LIBCFS_ALLOC(ksocknal_data.ksnd_peers,
2408 sizeof(struct list_head) *
2409 ksocknal_data.ksnd_peer_hash_size);
2410 if (!ksocknal_data.ksnd_peers)
2411 return -ENOMEM;
2412
2413 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++)
2414 INIT_LIST_HEAD(&ksocknal_data.ksnd_peers[i]);
2415
2416 rwlock_init(&ksocknal_data.ksnd_global_lock);
2417 INIT_LIST_HEAD(&ksocknal_data.ksnd_nets);
2418
2419 spin_lock_init(&ksocknal_data.ksnd_reaper_lock);
2420 INIT_LIST_HEAD(&ksocknal_data.ksnd_enomem_conns);
2421 INIT_LIST_HEAD(&ksocknal_data.ksnd_zombie_conns);
2422 INIT_LIST_HEAD(&ksocknal_data.ksnd_deathrow_conns);
2423 init_waitqueue_head(&ksocknal_data.ksnd_reaper_waitq);
2424
2425 spin_lock_init(&ksocknal_data.ksnd_connd_lock);
2426 INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_connreqs);
2427 INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_routes);
2428 init_waitqueue_head(&ksocknal_data.ksnd_connd_waitq);
2429
2430 spin_lock_init(&ksocknal_data.ksnd_tx_lock);
2431 INIT_LIST_HEAD(&ksocknal_data.ksnd_idle_noop_txs);
2432
2433 /* NB memset above zeros whole of ksocknal_data */
2434
2435 /* flag lists/ptrs/locks initialised */
2436 ksocknal_data.ksnd_init = SOCKNAL_INIT_DATA;
2437 try_module_get(THIS_MODULE);
2438
2439 ksocknal_data.ksnd_sched_info = cfs_percpt_alloc(lnet_cpt_table(),
2440 sizeof(*info));
2441 if (!ksocknal_data.ksnd_sched_info)
2442 goto failed;
2443
2444 cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2445 struct ksock_sched *sched;
2446 int nthrs;
2447
2448 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
2449 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2450 nthrs = min(nthrs, *ksocknal_tunables.ksnd_nscheds);
2451 } else {
2452 /*
2453 * max to half of CPUs, assume another half should be
2454 * reserved for upper layer modules
2455 */
2456 nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2457 }
2458
2459 info->ksi_nthreads_max = nthrs;
2460 info->ksi_cpt = i;
2461
2462 LIBCFS_CPT_ALLOC(info->ksi_scheds, lnet_cpt_table(), i,
2463 info->ksi_nthreads_max * sizeof(*sched));
2464 if (!info->ksi_scheds)
2465 goto failed;
2466
2467 for (; nthrs > 0; nthrs--) {
2468 sched = &info->ksi_scheds[nthrs - 1];
2469
2470 sched->kss_info = info;
2471 spin_lock_init(&sched->kss_lock);
2472 INIT_LIST_HEAD(&sched->kss_rx_conns);
2473 INIT_LIST_HEAD(&sched->kss_tx_conns);
2474 INIT_LIST_HEAD(&sched->kss_zombie_noop_txs);
2475 init_waitqueue_head(&sched->kss_waitq);
2476 }
2477 }
2478
2479 ksocknal_data.ksnd_connd_starting = 0;
2480 ksocknal_data.ksnd_connd_failed_stamp = 0;
2481 ksocknal_data.ksnd_connd_starting_stamp = ktime_get_real_seconds();
2482 /*
2483 * must have at least 2 connds to remain responsive to accepts while
2484 * connecting
2485 */
2486 if (*ksocknal_tunables.ksnd_nconnds < SOCKNAL_CONND_RESV + 1)
2487 *ksocknal_tunables.ksnd_nconnds = SOCKNAL_CONND_RESV + 1;
2488
2489 if (*ksocknal_tunables.ksnd_nconnds_max <
2490 *ksocknal_tunables.ksnd_nconnds) {
2491 ksocknal_tunables.ksnd_nconnds_max =
2492 ksocknal_tunables.ksnd_nconnds;
2493 }
2494
2495 for (i = 0; i < *ksocknal_tunables.ksnd_nconnds; i++) {
2496 char name[16];
2497
2498 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2499 ksocknal_data.ksnd_connd_starting++;
2500 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2501
2502 snprintf(name, sizeof(name), "socknal_cd%02d", i);
2503 rc = ksocknal_thread_start(ksocknal_connd,
2504 (void *)((uintptr_t)i), name);
2505 if (rc) {
2506 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2507 ksocknal_data.ksnd_connd_starting--;
2508 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2509 CERROR("Can't spawn socknal connd: %d\n", rc);
2510 goto failed;
2511 }
2512 }
2513
2514 rc = ksocknal_thread_start(ksocknal_reaper, NULL, "socknal_reaper");
2515 if (rc) {
2516 CERROR("Can't spawn socknal reaper: %d\n", rc);
2517 goto failed;
2518 }
2519
2520 /* flag everything initialised */
2521 ksocknal_data.ksnd_init = SOCKNAL_INIT_ALL;
2522
2523 return 0;
2524
2525 failed:
2526 ksocknal_base_shutdown();
2527 return -ENETDOWN;
2528 }
2529
2530 static void
2531 ksocknal_debug_peerhash(struct lnet_ni *ni)
2532 {
2533 struct ksock_peer *peer = NULL;
2534 struct list_head *tmp;
2535 int i;
2536
2537 read_lock(&ksocknal_data.ksnd_global_lock);
2538
2539 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2540 list_for_each(tmp, &ksocknal_data.ksnd_peers[i]) {
2541 peer = list_entry(tmp, struct ksock_peer, ksnp_list);
2542
2543 if (peer->ksnp_ni == ni)
2544 break;
2545
2546 peer = NULL;
2547 }
2548 }
2549
2550 if (peer) {
2551 struct ksock_route *route;
2552 struct ksock_conn *conn;
2553
2554 CWARN("Active peer on shutdown: %s, ref %d, scnt %d, closing %d, accepting %d, err %d, zcookie %llu, txq %d, zc_req %d\n",
2555 libcfs_id2str(peer->ksnp_id),
2556 atomic_read(&peer->ksnp_refcount),
2557 peer->ksnp_sharecount, peer->ksnp_closing,
2558 peer->ksnp_accepting, peer->ksnp_error,
2559 peer->ksnp_zc_next_cookie,
2560 !list_empty(&peer->ksnp_tx_queue),
2561 !list_empty(&peer->ksnp_zc_req_list));
2562
2563 list_for_each(tmp, &peer->ksnp_routes) {
2564 route = list_entry(tmp, struct ksock_route, ksnr_list);
2565 CWARN("Route: ref %d, schd %d, conn %d, cnted %d, del %d\n",
2566 atomic_read(&route->ksnr_refcount),
2567 route->ksnr_scheduled, route->ksnr_connecting,
2568 route->ksnr_connected, route->ksnr_deleted);
2569 }
2570
2571 list_for_each(tmp, &peer->ksnp_conns) {
2572 conn = list_entry(tmp, struct ksock_conn, ksnc_list);
2573 CWARN("Conn: ref %d, sref %d, t %d, c %d\n",
2574 atomic_read(&conn->ksnc_conn_refcount),
2575 atomic_read(&conn->ksnc_sock_refcount),
2576 conn->ksnc_type, conn->ksnc_closing);
2577 }
2578 }
2579
2580 read_unlock(&ksocknal_data.ksnd_global_lock);
2581 }
2582
2583 void
2584 ksocknal_shutdown(struct lnet_ni *ni)
2585 {
2586 struct ksock_net *net = ni->ni_data;
2587 int i;
2588 struct lnet_process_id anyid = {0};
2589
2590 anyid.nid = LNET_NID_ANY;
2591 anyid.pid = LNET_PID_ANY;
2592
2593 LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_ALL);
2594 LASSERT(ksocknal_data.ksnd_nnets > 0);
2595
2596 spin_lock_bh(&net->ksnn_lock);
2597 net->ksnn_shutdown = 1; /* prevent new peers */
2598 spin_unlock_bh(&net->ksnn_lock);
2599
2600 /* Delete all peers */
2601 ksocknal_del_peer(ni, anyid, 0);
2602
2603 /* Wait for all peer state to clean up */
2604 i = 2;
2605 spin_lock_bh(&net->ksnn_lock);
2606 while (net->ksnn_npeers) {
2607 spin_unlock_bh(&net->ksnn_lock);
2608
2609 i++;
2610 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2611 "waiting for %d peers to disconnect\n",
2612 net->ksnn_npeers);
2613 set_current_state(TASK_UNINTERRUPTIBLE);
2614 schedule_timeout(cfs_time_seconds(1));
2615
2616 ksocknal_debug_peerhash(ni);
2617
2618 spin_lock_bh(&net->ksnn_lock);
2619 }
2620 spin_unlock_bh(&net->ksnn_lock);
2621
2622 for (i = 0; i < net->ksnn_ninterfaces; i++) {
2623 LASSERT(!net->ksnn_interfaces[i].ksni_npeers);
2624 LASSERT(!net->ksnn_interfaces[i].ksni_nroutes);
2625 }
2626
2627 list_del(&net->ksnn_list);
2628 LIBCFS_FREE(net, sizeof(*net));
2629
2630 ksocknal_data.ksnd_nnets--;
2631 if (!ksocknal_data.ksnd_nnets)
2632 ksocknal_base_shutdown();
2633 }
2634
2635 static int
2636 ksocknal_enumerate_interfaces(struct ksock_net *net)
2637 {
2638 char **names;
2639 int i;
2640 int j;
2641 int rc;
2642 int n;
2643
2644 n = lnet_ipif_enumerate(&names);
2645 if (n <= 0) {
2646 CERROR("Can't enumerate interfaces: %d\n", n);
2647 return n;
2648 }
2649
2650 for (i = j = 0; i < n; i++) {
2651 int up;
2652 __u32 ip;
2653 __u32 mask;
2654
2655 if (!strcmp(names[i], "lo")) /* skip the loopback IF */
2656 continue;
2657
2658 rc = lnet_ipif_query(names[i], &up, &ip, &mask);
2659 if (rc) {
2660 CWARN("Can't get interface %s info: %d\n",
2661 names[i], rc);
2662 continue;
2663 }
2664
2665 if (!up) {
2666 CWARN("Ignoring interface %s (down)\n",
2667 names[i]);
2668 continue;
2669 }
2670
2671 if (j == LNET_MAX_INTERFACES) {
2672 CWARN("Ignoring interface %s (too many interfaces)\n",
2673 names[i]);
2674 continue;
2675 }
2676
2677 net->ksnn_interfaces[j].ksni_ipaddr = ip;
2678 net->ksnn_interfaces[j].ksni_netmask = mask;
2679 strlcpy(net->ksnn_interfaces[j].ksni_name,
2680 names[i], sizeof(net->ksnn_interfaces[j].ksni_name));
2681 j++;
2682 }
2683
2684 lnet_ipif_free_enumeration(names, n);
2685
2686 if (!j)
2687 CERROR("Can't find any usable interfaces\n");
2688
2689 return j;
2690 }
2691
2692 static int
2693 ksocknal_search_new_ipif(struct ksock_net *net)
2694 {
2695 int new_ipif = 0;
2696 int i;
2697
2698 for (i = 0; i < net->ksnn_ninterfaces; i++) {
2699 char *ifnam = &net->ksnn_interfaces[i].ksni_name[0];
2700 char *colon = strchr(ifnam, ':');
2701 int found = 0;
2702 struct ksock_net *tmp;
2703 int j;
2704
2705 if (colon) /* ignore alias device */
2706 *colon = 0;
2707
2708 list_for_each_entry(tmp, &ksocknal_data.ksnd_nets, ksnn_list) {
2709 for (j = 0; !found && j < tmp->ksnn_ninterfaces; j++) {
2710 char *ifnam2 =
2711 &tmp->ksnn_interfaces[j].ksni_name[0];
2712 char *colon2 = strchr(ifnam2, ':');
2713
2714 if (colon2)
2715 *colon2 = 0;
2716
2717 found = !strcmp(ifnam, ifnam2);
2718 if (colon2)
2719 *colon2 = ':';
2720 }
2721 if (found)
2722 break;
2723 }
2724
2725 new_ipif += !found;
2726 if (colon)
2727 *colon = ':';
2728 }
2729
2730 return new_ipif;
2731 }
2732
2733 static int
2734 ksocknal_start_schedulers(struct ksock_sched_info *info)
2735 {
2736 int nthrs;
2737 int rc = 0;
2738 int i;
2739
2740 if (!info->ksi_nthreads) {
2741 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2742 nthrs = info->ksi_nthreads_max;
2743 } else {
2744 nthrs = cfs_cpt_weight(lnet_cpt_table(),
2745 info->ksi_cpt);
2746 nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2747 nthrs = min(SOCKNAL_NSCHEDS_HIGH, nthrs);
2748 }
2749 nthrs = min(nthrs, info->ksi_nthreads_max);
2750 } else {
2751 LASSERT(info->ksi_nthreads <= info->ksi_nthreads_max);
2752 /* increase two threads if there is new interface */
2753 nthrs = min(2, info->ksi_nthreads_max - info->ksi_nthreads);
2754 }
2755
2756 for (i = 0; i < nthrs; i++) {
2757 long id;
2758 char name[20];
2759 struct ksock_sched *sched;
2760
2761 id = KSOCK_THREAD_ID(info->ksi_cpt, info->ksi_nthreads + i);
2762 sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
2763 snprintf(name, sizeof(name), "socknal_sd%02d_%02d",
2764 info->ksi_cpt, (int)(sched - &info->ksi_scheds[0]));
2765
2766 rc = ksocknal_thread_start(ksocknal_scheduler,
2767 (void *)id, name);
2768 if (!rc)
2769 continue;
2770
2771 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
2772 info->ksi_cpt, info->ksi_nthreads + i, rc);
2773 break;
2774 }
2775
2776 info->ksi_nthreads += i;
2777 return rc;
2778 }
2779
2780 static int
2781 ksocknal_net_start_threads(struct ksock_net *net, __u32 *cpts, int ncpts)
2782 {
2783 int newif = ksocknal_search_new_ipif(net);
2784 int rc;
2785 int i;
2786
2787 LASSERT(ncpts > 0 && ncpts <= cfs_cpt_number(lnet_cpt_table()));
2788
2789 for (i = 0; i < ncpts; i++) {
2790 struct ksock_sched_info *info;
2791 int cpt = !cpts ? i : cpts[i];
2792
2793 LASSERT(cpt < cfs_cpt_number(lnet_cpt_table()));
2794 info = ksocknal_data.ksnd_sched_info[cpt];
2795
2796 if (!newif && info->ksi_nthreads > 0)
2797 continue;
2798
2799 rc = ksocknal_start_schedulers(info);
2800 if (rc)
2801 return rc;
2802 }
2803 return 0;
2804 }
2805
2806 int
2807 ksocknal_startup(struct lnet_ni *ni)
2808 {
2809 struct ksock_net *net;
2810 int rc;
2811 int i;
2812
2813 LASSERT(ni->ni_lnd == &the_ksocklnd);
2814
2815 if (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING) {
2816 rc = ksocknal_base_startup();
2817 if (rc)
2818 return rc;
2819 }
2820
2821 LIBCFS_ALLOC(net, sizeof(*net));
2822 if (!net)
2823 goto fail_0;
2824
2825 spin_lock_init(&net->ksnn_lock);
2826 net->ksnn_incarnation = ksocknal_new_incarnation();
2827 ni->ni_data = net;
2828 ni->ni_peertimeout = *ksocknal_tunables.ksnd_peertimeout;
2829 ni->ni_maxtxcredits = *ksocknal_tunables.ksnd_credits;
2830 ni->ni_peertxcredits = *ksocknal_tunables.ksnd_peertxcredits;
2831 ni->ni_peerrtrcredits = *ksocknal_tunables.ksnd_peerrtrcredits;
2832
2833 if (!ni->ni_interfaces[0]) {
2834 rc = ksocknal_enumerate_interfaces(net);
2835 if (rc <= 0)
2836 goto fail_1;
2837
2838 net->ksnn_ninterfaces = 1;
2839 } else {
2840 for (i = 0; i < LNET_MAX_INTERFACES; i++) {
2841 int up;
2842
2843 if (!ni->ni_interfaces[i])
2844 break;
2845
2846 rc = lnet_ipif_query(ni->ni_interfaces[i], &up,
2847 &net->ksnn_interfaces[i].ksni_ipaddr,
2848 &net->ksnn_interfaces[i].ksni_netmask);
2849
2850 if (rc) {
2851 CERROR("Can't get interface %s info: %d\n",
2852 ni->ni_interfaces[i], rc);
2853 goto fail_1;
2854 }
2855
2856 if (!up) {
2857 CERROR("Interface %s is down\n",
2858 ni->ni_interfaces[i]);
2859 goto fail_1;
2860 }
2861
2862 strlcpy(net->ksnn_interfaces[i].ksni_name,
2863 ni->ni_interfaces[i],
2864 sizeof(net->ksnn_interfaces[i].ksni_name));
2865 }
2866 net->ksnn_ninterfaces = i;
2867 }
2868
2869 /* call it before add it to ksocknal_data.ksnd_nets */
2870 rc = ksocknal_net_start_threads(net, ni->ni_cpts, ni->ni_ncpts);
2871 if (rc)
2872 goto fail_1;
2873
2874 ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid),
2875 net->ksnn_interfaces[0].ksni_ipaddr);
2876 list_add(&net->ksnn_list, &ksocknal_data.ksnd_nets);
2877
2878 ksocknal_data.ksnd_nnets++;
2879
2880 return 0;
2881
2882 fail_1:
2883 LIBCFS_FREE(net, sizeof(*net));
2884 fail_0:
2885 if (!ksocknal_data.ksnd_nnets)
2886 ksocknal_base_shutdown();
2887
2888 return -ENETDOWN;
2889 }
2890
2891 static void __exit ksocklnd_exit(void)
2892 {
2893 lnet_unregister_lnd(&the_ksocklnd);
2894 }
2895
2896 static int __init ksocklnd_init(void)
2897 {
2898 int rc;
2899
2900 /* check ksnr_connected/connecting field large enough */
2901 BUILD_BUG_ON(SOCKLND_CONN_NTYPES > 4);
2902 BUILD_BUG_ON(SOCKLND_CONN_ACK != SOCKLND_CONN_BULK_IN);
2903
2904 /* initialize the_ksocklnd */
2905 the_ksocklnd.lnd_type = SOCKLND;
2906 the_ksocklnd.lnd_startup = ksocknal_startup;
2907 the_ksocklnd.lnd_shutdown = ksocknal_shutdown;
2908 the_ksocklnd.lnd_ctl = ksocknal_ctl;
2909 the_ksocklnd.lnd_send = ksocknal_send;
2910 the_ksocklnd.lnd_recv = ksocknal_recv;
2911 the_ksocklnd.lnd_notify = ksocknal_notify;
2912 the_ksocklnd.lnd_query = ksocknal_query;
2913 the_ksocklnd.lnd_accept = ksocknal_accept;
2914
2915 rc = ksocknal_tunables_init();
2916 if (rc)
2917 return rc;
2918
2919 lnet_register_lnd(&the_ksocklnd);
2920
2921 return 0;
2922 }
2923
2924 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2925 MODULE_DESCRIPTION("TCP Socket LNet Network Driver");
2926 MODULE_VERSION("2.7.0");
2927 MODULE_LICENSE("GPL");
2928
2929 module_init(ksocklnd_init);
2930 module_exit(ksocklnd_exit);
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