4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
35 #define DEBUG_SUBSYSTEM S_LNET
37 #include <linux/sched.h>
38 #ifdef HAVE_SCHED_HEADERS
39 #include <linux/sched/signal.h>
41 #include <linux/uaccess.h>
43 #include <lnet/lib-lnet.h>
44 #include <uapi/linux/lnet/lnet-dlc.h>
46 /* Value indicating that recovery needs to re-check a peer immediately. */
47 #define LNET_REDISCOVER_PEER (1)
49 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp);
52 lnet_peer_remove_from_remote_list(struct lnet_peer_ni *lpni)
54 if (!list_empty(&lpni->lpni_on_remote_peer_ni_list)) {
55 list_del_init(&lpni->lpni_on_remote_peer_ni_list);
56 lnet_peer_ni_decref_locked(lpni);
61 lnet_peer_net_added(struct lnet_net *net)
63 struct lnet_peer_ni *lpni, *tmp;
65 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
66 lpni_on_remote_peer_ni_list) {
68 if (LNET_NIDNET(lpni->lpni_nid) == net->net_id) {
71 spin_lock(&lpni->lpni_lock);
72 lpni->lpni_txcredits =
73 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
74 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
75 lpni->lpni_rtrcredits =
76 lnet_peer_buffer_credits(lpni->lpni_net);
77 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
78 spin_unlock(&lpni->lpni_lock);
80 lnet_peer_remove_from_remote_list(lpni);
86 lnet_peer_tables_destroy(void)
88 struct lnet_peer_table *ptable;
89 struct list_head *hash;
93 if (!the_lnet.ln_peer_tables)
96 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
97 hash = ptable->pt_hash;
98 if (!hash) /* not intialized */
101 LASSERT(list_empty(&ptable->pt_zombie_list));
103 ptable->pt_hash = NULL;
104 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
105 LASSERT(list_empty(&hash[j]));
107 LIBCFS_FREE(hash, LNET_PEER_HASH_SIZE * sizeof(*hash));
110 cfs_percpt_free(the_lnet.ln_peer_tables);
111 the_lnet.ln_peer_tables = NULL;
115 lnet_peer_tables_create(void)
117 struct lnet_peer_table *ptable;
118 struct list_head *hash;
122 the_lnet.ln_peer_tables = cfs_percpt_alloc(lnet_cpt_table(),
124 if (the_lnet.ln_peer_tables == NULL) {
125 CERROR("Failed to allocate cpu-partition peer tables\n");
129 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
130 LIBCFS_CPT_ALLOC(hash, lnet_cpt_table(), i,
131 LNET_PEER_HASH_SIZE * sizeof(*hash));
133 CERROR("Failed to create peer hash table\n");
134 lnet_peer_tables_destroy();
138 spin_lock_init(&ptable->pt_zombie_lock);
139 INIT_LIST_HEAD(&ptable->pt_zombie_list);
141 INIT_LIST_HEAD(&ptable->pt_peer_list);
143 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
144 INIT_LIST_HEAD(&hash[j]);
145 ptable->pt_hash = hash; /* sign of initialization */
151 static struct lnet_peer_ni *
152 lnet_peer_ni_alloc(lnet_nid_t nid)
154 struct lnet_peer_ni *lpni;
155 struct lnet_net *net;
158 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
160 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt, sizeof(*lpni));
164 INIT_LIST_HEAD(&lpni->lpni_txq);
165 INIT_LIST_HEAD(&lpni->lpni_rtrq);
166 INIT_LIST_HEAD(&lpni->lpni_routes);
167 INIT_LIST_HEAD(&lpni->lpni_hashlist);
168 INIT_LIST_HEAD(&lpni->lpni_peer_nis);
169 INIT_LIST_HEAD(&lpni->lpni_recovery);
170 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
171 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
173 spin_lock_init(&lpni->lpni_lock);
175 lpni->lpni_alive = !lnet_peers_start_down(); /* 1 bit!! */
176 lpni->lpni_last_alive = ktime_get_seconds(); /* assumes alive */
177 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
178 lpni->lpni_nid = nid;
179 lpni->lpni_cpt = cpt;
180 atomic_set(&lpni->lpni_healthv, LNET_MAX_HEALTH_VALUE);
182 net = lnet_get_net_locked(LNET_NIDNET(nid));
183 lpni->lpni_net = net;
185 lpni->lpni_txcredits = net->net_tunables.lct_peer_tx_credits;
186 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
187 lpni->lpni_rtrcredits = lnet_peer_buffer_credits(net);
188 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
191 * This peer_ni is not on a local network, so we
192 * cannot add the credits here. In case the net is
193 * added later, add the peer_ni to the remote peer ni
194 * list so it can be easily found and revisited.
196 /* FIXME: per-net implementation instead? */
197 atomic_inc(&lpni->lpni_refcount);
198 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
199 &the_lnet.ln_remote_peer_ni_list);
202 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
207 static struct lnet_peer_net *
208 lnet_peer_net_alloc(__u32 net_id)
210 struct lnet_peer_net *lpn;
212 LIBCFS_CPT_ALLOC(lpn, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lpn));
216 INIT_LIST_HEAD(&lpn->lpn_peer_nets);
217 INIT_LIST_HEAD(&lpn->lpn_peer_nis);
218 lpn->lpn_net_id = net_id;
220 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
226 lnet_destroy_peer_net_locked(struct lnet_peer_net *lpn)
228 struct lnet_peer *lp;
230 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
232 LASSERT(atomic_read(&lpn->lpn_refcount) == 0);
233 LASSERT(list_empty(&lpn->lpn_peer_nis));
234 LASSERT(list_empty(&lpn->lpn_peer_nets));
236 lpn->lpn_peer = NULL;
237 LIBCFS_FREE(lpn, sizeof(*lpn));
239 lnet_peer_decref_locked(lp);
242 static struct lnet_peer *
243 lnet_peer_alloc(lnet_nid_t nid)
245 struct lnet_peer *lp;
247 LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lp));
251 INIT_LIST_HEAD(&lp->lp_peer_list);
252 INIT_LIST_HEAD(&lp->lp_peer_nets);
253 INIT_LIST_HEAD(&lp->lp_dc_list);
254 INIT_LIST_HEAD(&lp->lp_dc_pendq);
255 init_waitqueue_head(&lp->lp_dc_waitq);
256 spin_lock_init(&lp->lp_lock);
257 lp->lp_primary_nid = nid;
258 lp->lp_disc_src_nid = LNET_NID_ANY;
261 * Turn off discovery for loopback peer. If you're creating a peer
262 * for the loopback interface then that was initiated when we
263 * attempted to send a message over the loopback. There is no need
264 * to ever use a different interface when sending messages to
267 if (nid == LNET_NID_LO_0)
268 lp->lp_state = LNET_PEER_NO_DISCOVERY;
269 lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
271 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
277 lnet_destroy_peer_locked(struct lnet_peer *lp)
279 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
281 LASSERT(atomic_read(&lp->lp_refcount) == 0);
282 LASSERT(list_empty(&lp->lp_peer_nets));
283 LASSERT(list_empty(&lp->lp_peer_list));
284 LASSERT(list_empty(&lp->lp_dc_list));
287 lnet_ping_buffer_decref(lp->lp_data);
290 * if there are messages still on the pending queue, then make
291 * sure to queue them on the ln_msg_resend list so they can be
292 * resent at a later point if the discovery thread is still
294 * If the discovery thread has stopped, then the wakeup will be a
295 * no-op, and it is expected the lnet_shutdown_lndnets() will
296 * eventually be called, which will traverse this list and
297 * finalize the messages on the list.
298 * We can not resend them now because we're holding the cpt lock.
299 * Releasing the lock can cause an inconsistent state
301 spin_lock(&the_lnet.ln_msg_resend_lock);
302 spin_lock(&lp->lp_lock);
303 list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
304 spin_unlock(&lp->lp_lock);
305 spin_unlock(&the_lnet.ln_msg_resend_lock);
306 wake_up(&the_lnet.ln_dc_waitq);
308 LIBCFS_FREE(lp, sizeof(*lp));
312 * Detach a peer_ni from its peer_net. If this was the last peer_ni on
313 * that peer_net, detach the peer_net from the peer.
315 * Call with lnet_net_lock/EX held
318 lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
320 struct lnet_peer_table *ptable;
321 struct lnet_peer_net *lpn;
322 struct lnet_peer *lp;
325 * Belts and suspenders: gracefully handle teardown of a
326 * partially connected peer_ni.
328 lpn = lpni->lpni_peer_net;
330 list_del_init(&lpni->lpni_peer_nis);
332 * If there are no lpni's left, we detach lpn from
333 * lp_peer_nets, so it cannot be found anymore.
335 if (list_empty(&lpn->lpn_peer_nis))
336 list_del_init(&lpn->lpn_peer_nets);
338 /* Update peer NID count. */
343 * If there are no more peer nets, make the peer unfindable
344 * via the peer_tables.
346 * Otherwise, if the peer is DISCOVERED, tell discovery to
347 * take another look at it. This is a no-op if discovery for
348 * this peer did the detaching.
350 if (list_empty(&lp->lp_peer_nets)) {
351 list_del_init(&lp->lp_peer_list);
352 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
354 } else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
355 /* Discovery isn't running, nothing to do here. */
356 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
357 lnet_peer_queue_for_discovery(lp);
358 wake_up(&the_lnet.ln_dc_waitq);
360 CDEBUG(D_NET, "peer %s NID %s\n",
361 libcfs_nid2str(lp->lp_primary_nid),
362 libcfs_nid2str(lpni->lpni_nid));
365 /* called with lnet_net_lock LNET_LOCK_EX held */
367 lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni)
369 struct lnet_peer_table *ptable = NULL;
371 /* don't remove a peer_ni if it's also a gateway */
372 if (lpni->lpni_rtr_refcount > 0) {
373 CERROR("Peer NI %s is a gateway. Can not delete it\n",
374 libcfs_nid2str(lpni->lpni_nid));
378 lnet_peer_remove_from_remote_list(lpni);
380 /* remove peer ni from the hash list. */
381 list_del_init(&lpni->lpni_hashlist);
384 * indicate the peer is being deleted so the monitor thread can
385 * remove it from the recovery queue.
387 spin_lock(&lpni->lpni_lock);
388 lpni->lpni_state |= LNET_PEER_NI_DELETING;
389 spin_unlock(&lpni->lpni_lock);
391 /* decrement the ref count on the peer table */
392 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
393 LASSERT(ptable->pt_number > 0);
397 * The peer_ni can no longer be found with a lookup. But there
398 * can be current users, so keep track of it on the zombie
399 * list until the reference count has gone to zero.
401 * The last reference may be lost in a place where the
402 * lnet_net_lock locks only a single cpt, and that cpt may not
403 * be lpni->lpni_cpt. So the zombie list of lnet_peer_table
406 spin_lock(&ptable->pt_zombie_lock);
407 list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
408 ptable->pt_zombies++;
409 spin_unlock(&ptable->pt_zombie_lock);
411 /* no need to keep this peer_ni on the hierarchy anymore */
412 lnet_peer_detach_peer_ni_locked(lpni);
414 /* remove hashlist reference on peer_ni */
415 lnet_peer_ni_decref_locked(lpni);
420 void lnet_peer_uninit(void)
422 struct lnet_peer_ni *lpni, *tmp;
424 lnet_net_lock(LNET_LOCK_EX);
426 /* remove all peer_nis from the remote peer and the hash list */
427 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
428 lpni_on_remote_peer_ni_list)
429 lnet_peer_ni_del_locked(lpni);
431 lnet_peer_tables_destroy();
433 lnet_net_unlock(LNET_LOCK_EX);
437 lnet_peer_del_locked(struct lnet_peer *peer)
439 struct lnet_peer_ni *lpni = NULL, *lpni2;
442 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(peer->lp_primary_nid));
444 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
445 while (lpni != NULL) {
446 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
447 rc = lnet_peer_ni_del_locked(lpni);
457 lnet_peer_del(struct lnet_peer *peer)
459 lnet_net_lock(LNET_LOCK_EX);
460 lnet_peer_del_locked(peer);
461 lnet_net_unlock(LNET_LOCK_EX);
467 * Delete a NID from a peer. Call with ln_api_mutex held.
470 * -EPERM: Non-DLC deletion from DLC-configured peer.
471 * -ENOENT: No lnet_peer_ni corresponding to the nid.
472 * -ECHILD: The lnet_peer_ni isn't connected to the peer.
473 * -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
476 lnet_peer_del_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
478 struct lnet_peer_ni *lpni;
479 lnet_nid_t primary_nid = lp->lp_primary_nid;
482 if (!(flags & LNET_PEER_CONFIGURED)) {
483 if (lp->lp_state & LNET_PEER_CONFIGURED) {
488 lpni = lnet_find_peer_ni_locked(nid);
493 lnet_peer_ni_decref_locked(lpni);
494 if (lp != lpni->lpni_peer_net->lpn_peer) {
500 * This function only allows deletion of the primary NID if it
503 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1) {
508 lnet_net_lock(LNET_LOCK_EX);
510 rc = lnet_peer_ni_del_locked(lpni);
512 lnet_net_unlock(LNET_LOCK_EX);
515 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
516 libcfs_nid2str(primary_nid), libcfs_nid2str(nid), flags, rc);
522 lnet_peer_table_cleanup_locked(struct lnet_net *net,
523 struct lnet_peer_table *ptable)
526 struct lnet_peer_ni *next;
527 struct lnet_peer_ni *lpni;
528 struct lnet_peer *peer;
530 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
531 list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
533 if (net != NULL && net != lpni->lpni_net)
536 peer = lpni->lpni_peer_net->lpn_peer;
537 if (peer->lp_primary_nid != lpni->lpni_nid) {
538 lnet_peer_ni_del_locked(lpni);
542 * Removing the primary NID implies removing
543 * the entire peer. Advance next beyond any
544 * peer_ni that belongs to the same peer.
546 list_for_each_entry_from(next, &ptable->pt_hash[i],
548 if (next->lpni_peer_net->lpn_peer != peer)
551 lnet_peer_del_locked(peer);
557 lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
561 spin_lock(&ptable->pt_zombie_lock);
562 while (ptable->pt_zombies) {
563 spin_unlock(&ptable->pt_zombie_lock);
565 if (is_power_of_2(i)) {
567 "Waiting for %d zombies on peer table\n",
570 set_current_state(TASK_UNINTERRUPTIBLE);
571 schedule_timeout(cfs_time_seconds(1) >> 1);
572 spin_lock(&ptable->pt_zombie_lock);
574 spin_unlock(&ptable->pt_zombie_lock);
578 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
579 struct lnet_peer_table *ptable)
581 struct lnet_peer_ni *lp;
582 struct lnet_peer_ni *tmp;
586 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
587 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
589 if (net != lp->lpni_net)
592 if (lp->lpni_rtr_refcount == 0)
595 lpni_nid = lp->lpni_nid;
597 lnet_net_unlock(LNET_LOCK_EX);
598 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), lpni_nid);
599 lnet_net_lock(LNET_LOCK_EX);
605 lnet_peer_tables_cleanup(struct lnet_net *net)
608 struct lnet_peer_table *ptable;
610 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
611 /* If just deleting the peers for a NI, get rid of any routes these
612 * peers are gateways for. */
613 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
614 lnet_net_lock(LNET_LOCK_EX);
615 lnet_peer_table_del_rtrs_locked(net, ptable);
616 lnet_net_unlock(LNET_LOCK_EX);
619 /* Start the cleanup process */
620 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
621 lnet_net_lock(LNET_LOCK_EX);
622 lnet_peer_table_cleanup_locked(net, ptable);
623 lnet_net_unlock(LNET_LOCK_EX);
626 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
627 lnet_peer_ni_finalize_wait(ptable);
630 static struct lnet_peer_ni *
631 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
633 struct list_head *peers;
634 struct lnet_peer_ni *lp;
636 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
638 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
639 list_for_each_entry(lp, peers, lpni_hashlist) {
640 if (lp->lpni_nid == nid) {
641 lnet_peer_ni_addref_locked(lp);
649 struct lnet_peer_ni *
650 lnet_find_peer_ni_locked(lnet_nid_t nid)
652 struct lnet_peer_ni *lpni;
653 struct lnet_peer_table *ptable;
656 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
658 ptable = the_lnet.ln_peer_tables[cpt];
659 lpni = lnet_get_peer_ni_locked(ptable, nid);
665 lnet_find_peer(lnet_nid_t nid)
667 struct lnet_peer_ni *lpni;
668 struct lnet_peer *lp = NULL;
671 cpt = lnet_net_lock_current();
672 lpni = lnet_find_peer_ni_locked(nid);
674 lp = lpni->lpni_peer_net->lpn_peer;
675 lnet_peer_addref_locked(lp);
676 lnet_peer_ni_decref_locked(lpni);
678 lnet_net_unlock(cpt);
683 struct lnet_peer_ni *
684 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
685 struct lnet_peer_net *peer_net,
686 struct lnet_peer_ni *prev)
688 struct lnet_peer_ni *lpni;
689 struct lnet_peer_net *net = peer_net;
693 if (list_empty(&peer->lp_peer_nets))
696 net = list_entry(peer->lp_peer_nets.next,
697 struct lnet_peer_net,
700 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
706 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
708 * if you reached the end of the peer ni list and the peer
709 * net is specified then there are no more peer nis in that
716 * we reached the end of this net ni list. move to the
719 if (prev->lpni_peer_net->lpn_peer_nets.next ==
721 /* no more nets and no more NIs. */
724 /* get the next net */
725 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
726 struct lnet_peer_net,
728 /* get the ni on it */
729 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
735 /* there are more nis left */
736 lpni = list_entry(prev->lpni_peer_nis.next,
737 struct lnet_peer_ni, lpni_peer_nis);
742 /* Call with the ln_api_mutex held */
743 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
745 struct lnet_process_id id;
746 struct lnet_peer_table *ptable;
747 struct lnet_peer *lp;
756 if (the_lnet.ln_state != LNET_STATE_RUNNING)
759 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
762 * Count the number of peers, and return E2BIG if the buffer
763 * is too small. We'll also return the desired size.
766 for (cpt = 0; cpt < lncpt; cpt++) {
767 ptable = the_lnet.ln_peer_tables[cpt];
768 count += ptable->pt_peers;
770 size = count * sizeof(*ids);
775 * Walk the peer lists and copy out the primary nids.
776 * This is safe because the peer lists are only modified
777 * while the ln_api_mutex is held. So we don't need to
778 * hold the lnet_net_lock as well, and can therefore
779 * directly call copy_to_user().
782 memset(&id, 0, sizeof(id));
783 id.pid = LNET_PID_LUSTRE;
785 for (cpt = 0; cpt < lncpt; cpt++) {
786 ptable = the_lnet.ln_peer_tables[cpt];
787 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
790 id.nid = lp->lp_primary_nid;
791 if (copy_to_user(&ids[i], &id, sizeof(id)))
804 * Start pushes to peers that need to be updated for a configuration
805 * change on this node.
808 lnet_push_update_to_peers(int force)
810 struct lnet_peer_table *ptable;
811 struct lnet_peer *lp;
815 lnet_net_lock(LNET_LOCK_EX);
816 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
817 for (cpt = 0; cpt < lncpt; cpt++) {
818 ptable = the_lnet.ln_peer_tables[cpt];
819 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
821 spin_lock(&lp->lp_lock);
822 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
823 lp->lp_state |= LNET_PEER_FORCE_PUSH;
824 spin_unlock(&lp->lp_lock);
826 if (lnet_peer_needs_push(lp))
827 lnet_peer_queue_for_discovery(lp);
830 lnet_net_unlock(LNET_LOCK_EX);
831 wake_up(&the_lnet.ln_dc_waitq);
835 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
836 * this is a preferred point-to-point path. Call with lnet_net_lock in
840 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
844 if (lpni->lpni_pref_nnids == 0)
846 if (lpni->lpni_pref_nnids == 1)
847 return lpni->lpni_pref.nid == nid;
848 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
849 if (lpni->lpni_pref.nids[i] == nid)
856 * Set a single ni as preferred, provided no preferred ni is already
857 * defined. Only to be used for non-multi-rail peer_ni.
860 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
864 spin_lock(&lpni->lpni_lock);
865 if (nid == LNET_NID_ANY) {
867 } else if (lpni->lpni_pref_nnids > 0) {
869 } else if (lpni->lpni_pref_nnids == 0) {
870 lpni->lpni_pref.nid = nid;
871 lpni->lpni_pref_nnids = 1;
872 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
874 spin_unlock(&lpni->lpni_lock);
876 CDEBUG(D_NET, "peer %s nid %s: %d\n",
877 libcfs_nid2str(lpni->lpni_nid), libcfs_nid2str(nid), rc);
882 * Clear the preferred NID from a non-multi-rail peer_ni, provided
883 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
886 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
890 spin_lock(&lpni->lpni_lock);
891 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
892 lpni->lpni_pref_nnids = 0;
893 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
894 } else if (lpni->lpni_pref_nnids == 0) {
899 spin_unlock(&lpni->lpni_lock);
901 CDEBUG(D_NET, "peer %s: %d\n",
902 libcfs_nid2str(lpni->lpni_nid), rc);
907 * Clear the preferred NIDs from a non-multi-rail peer.
910 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
912 struct lnet_peer_ni *lpni = NULL;
914 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
915 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
919 lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
921 lnet_nid_t *nids = NULL;
922 lnet_nid_t *oldnids = NULL;
923 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
928 if (nid == LNET_NID_ANY) {
933 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
938 /* A non-MR node may have only one preferred NI per peer_ni */
939 if (lpni->lpni_pref_nnids > 0) {
940 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
946 if (lpni->lpni_pref_nnids != 0) {
947 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
948 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
953 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
954 if (lpni->lpni_pref.nids[i] == nid) {
955 LIBCFS_FREE(nids, size);
959 nids[i] = lpni->lpni_pref.nids[i];
964 lnet_net_lock(LNET_LOCK_EX);
965 spin_lock(&lpni->lpni_lock);
966 if (lpni->lpni_pref_nnids == 0) {
967 lpni->lpni_pref.nid = nid;
969 oldnids = lpni->lpni_pref.nids;
970 lpni->lpni_pref.nids = nids;
972 lpni->lpni_pref_nnids++;
973 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
974 spin_unlock(&lpni->lpni_lock);
975 lnet_net_unlock(LNET_LOCK_EX);
978 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
979 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
982 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
983 spin_lock(&lpni->lpni_lock);
984 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
985 spin_unlock(&lpni->lpni_lock);
987 CDEBUG(D_NET, "peer %s nid %s: %d\n",
988 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
993 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
995 lnet_nid_t *nids = NULL;
996 lnet_nid_t *oldnids = NULL;
997 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1002 if (lpni->lpni_pref_nnids == 0) {
1007 if (lpni->lpni_pref_nnids == 1) {
1008 if (lpni->lpni_pref.nid != nid) {
1012 } else if (lpni->lpni_pref_nnids == 2) {
1013 if (lpni->lpni_pref.nids[0] != nid &&
1014 lpni->lpni_pref.nids[1] != nid) {
1019 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1020 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1025 for (i = 0, j = 0; i < lpni->lpni_pref_nnids; i++) {
1026 if (lpni->lpni_pref.nids[i] != nid)
1028 nids[j++] = lpni->lpni_pref.nids[i];
1030 /* Check if we actually removed a nid. */
1031 if (j == lpni->lpni_pref_nnids) {
1032 LIBCFS_FREE(nids, size);
1038 lnet_net_lock(LNET_LOCK_EX);
1039 spin_lock(&lpni->lpni_lock);
1040 if (lpni->lpni_pref_nnids == 1) {
1041 lpni->lpni_pref.nid = LNET_NID_ANY;
1042 } else if (lpni->lpni_pref_nnids == 2) {
1043 oldnids = lpni->lpni_pref.nids;
1044 if (oldnids[0] == nid)
1045 lpni->lpni_pref.nid = oldnids[1];
1047 lpni->lpni_pref.nid = oldnids[2];
1049 oldnids = lpni->lpni_pref.nids;
1050 lpni->lpni_pref.nids = nids;
1052 lpni->lpni_pref_nnids--;
1053 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1054 spin_unlock(&lpni->lpni_lock);
1055 lnet_net_unlock(LNET_LOCK_EX);
1058 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1059 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
1062 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1063 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1068 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1070 struct lnet_peer_ni *lpni;
1071 lnet_nid_t primary_nid = nid;
1073 lpni = lnet_find_peer_ni_locked(nid);
1075 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
1076 lnet_peer_ni_decref_locked(lpni);
1083 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1085 if (lnet_peer_discovery_disabled)
1088 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1089 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1100 lnet_is_discovery_disabled(struct lnet_peer *lp)
1104 spin_lock(&lp->lp_lock);
1105 rc = lnet_is_discovery_disabled_locked(lp);
1106 spin_unlock(&lp->lp_lock);
1112 LNetPrimaryNID(lnet_nid_t nid)
1114 struct lnet_peer *lp;
1115 struct lnet_peer_ni *lpni;
1116 lnet_nid_t primary_nid = nid;
1120 if (nid == LNET_NID_LO_0)
1121 return LNET_NID_LO_0;
1123 cpt = lnet_net_lock_current();
1124 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1129 lp = lpni->lpni_peer_net->lpn_peer;
1131 while (!lnet_peer_is_uptodate(lp)) {
1132 rc = lnet_discover_peer_locked(lpni, cpt, true);
1135 lp = lpni->lpni_peer_net->lpn_peer;
1137 /* Only try once if discovery is disabled */
1138 if (lnet_is_discovery_disabled(lp))
1141 primary_nid = lp->lp_primary_nid;
1143 lnet_peer_ni_decref_locked(lpni);
1145 lnet_net_unlock(cpt);
1147 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1148 libcfs_nid2str(primary_nid), rc);
1151 EXPORT_SYMBOL(LNetPrimaryNID);
1153 struct lnet_peer_net *
1154 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1156 struct lnet_peer_net *peer_net;
1157 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1158 if (peer_net->lpn_net_id == net_id)
1165 * Attach a peer_ni to a peer_net and peer. This function assumes
1166 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1167 * may be attached to a different peer, in which case it will be
1168 * properly detached first. The whole operation is done atomically.
1170 * Always returns 0. This is the last function called from functions
1171 * that do return an int, so returning 0 here allows the compiler to
1175 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1176 struct lnet_peer_net *lpn,
1177 struct lnet_peer_ni *lpni,
1180 struct lnet_peer_table *ptable;
1182 /* Install the new peer_ni */
1183 lnet_net_lock(LNET_LOCK_EX);
1184 /* Add peer_ni to global peer table hash, if necessary. */
1185 if (list_empty(&lpni->lpni_hashlist)) {
1186 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1188 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1189 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1190 ptable->pt_version++;
1191 ptable->pt_number++;
1192 /* This is the 1st refcount on lpni. */
1193 atomic_inc(&lpni->lpni_refcount);
1196 /* Detach the peer_ni from an existing peer, if necessary. */
1197 if (lpni->lpni_peer_net) {
1198 LASSERT(lpni->lpni_peer_net != lpn);
1199 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1200 lnet_peer_detach_peer_ni_locked(lpni);
1201 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1202 lpni->lpni_peer_net = NULL;
1205 /* Add peer_ni to peer_net */
1206 lpni->lpni_peer_net = lpn;
1207 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1208 lnet_peer_net_addref_locked(lpn);
1210 /* Add peer_net to peer */
1211 if (!lpn->lpn_peer) {
1213 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1214 lnet_peer_addref_locked(lp);
1217 /* Add peer to global peer list, if necessary */
1218 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1219 if (list_empty(&lp->lp_peer_list)) {
1220 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1225 /* Update peer state */
1226 spin_lock(&lp->lp_lock);
1227 if (flags & LNET_PEER_CONFIGURED) {
1228 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1229 lp->lp_state |= LNET_PEER_CONFIGURED;
1231 if (flags & LNET_PEER_MULTI_RAIL) {
1232 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1233 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1234 lnet_peer_clr_non_mr_pref_nids(lp);
1237 spin_unlock(&lp->lp_lock);
1240 lnet_net_unlock(LNET_LOCK_EX);
1242 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1243 libcfs_nid2str(lp->lp_primary_nid),
1244 libcfs_nid2str(lpni->lpni_nid), flags);
1250 * Create a new peer, with nid as its primary nid.
1252 * Call with the lnet_api_mutex held.
1255 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1257 struct lnet_peer *lp;
1258 struct lnet_peer_net *lpn;
1259 struct lnet_peer_ni *lpni;
1262 LASSERT(nid != LNET_NID_ANY);
1265 * No need for the lnet_net_lock here, because the
1266 * lnet_api_mutex is held.
1268 lpni = lnet_find_peer_ni_locked(nid);
1270 /* A peer with this NID already exists. */
1271 lp = lpni->lpni_peer_net->lpn_peer;
1272 lnet_peer_ni_decref_locked(lpni);
1274 * This is an error if the peer was configured and the
1275 * primary NID differs or an attempt is made to change
1276 * the Multi-Rail flag. Otherwise the assumption is
1277 * that an existing peer is being modified.
1279 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1280 if (lp->lp_primary_nid != nid)
1282 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1286 /* Delete and recreate as a configured peer. */
1290 /* Create peer, peer_net, and peer_ni. */
1292 lp = lnet_peer_alloc(nid);
1295 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1298 lpni = lnet_peer_ni_alloc(nid);
1302 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1305 LIBCFS_FREE(lpn, sizeof(*lpn));
1307 LIBCFS_FREE(lp, sizeof(*lp));
1309 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1310 libcfs_nid2str(nid), flags, rc);
1315 * Add a NID to a peer. Call with ln_api_mutex held.
1318 * -EPERM: Non-DLC addition to a DLC-configured peer.
1319 * -EEXIST: The NID was configured by DLC for a different peer.
1320 * -ENOMEM: Out of memory.
1321 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1322 * non-multi-rail peer.
1325 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1327 struct lnet_peer_net *lpn;
1328 struct lnet_peer_ni *lpni;
1332 LASSERT(nid != LNET_NID_ANY);
1334 /* A configured peer can only be updated through configuration. */
1335 if (!(flags & LNET_PEER_CONFIGURED)) {
1336 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1343 * The MULTI_RAIL flag can be set but not cleared, because
1344 * that would leave the peer struct in an invalid state.
1346 if (flags & LNET_PEER_MULTI_RAIL) {
1347 spin_lock(&lp->lp_lock);
1348 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1349 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1350 lnet_peer_clr_non_mr_pref_nids(lp);
1352 spin_unlock(&lp->lp_lock);
1353 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1358 lpni = lnet_find_peer_ni_locked(nid);
1361 * A peer_ni already exists. This is only a problem if
1362 * it is not connected to this peer and was configured
1365 lnet_peer_ni_decref_locked(lpni);
1366 if (lpni->lpni_peer_net->lpn_peer == lp)
1368 if (lnet_peer_ni_is_configured(lpni)) {
1372 /* If this is the primary NID, destroy the peer. */
1373 if (lnet_peer_ni_is_primary(lpni)) {
1374 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1375 lpni = lnet_peer_ni_alloc(nid);
1382 lpni = lnet_peer_ni_alloc(nid);
1390 * Get the peer_net. Check that we're not adding a second
1391 * peer_ni on a peer_net of a non-multi-rail peer.
1393 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1395 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1400 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1405 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1408 /* If the peer_ni was allocated above its peer_net pointer is NULL */
1409 if (!lpni->lpni_peer_net)
1410 LIBCFS_FREE(lpni, sizeof(*lpni));
1412 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1413 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1419 * Update the primary NID of a peer, if possible.
1421 * Call with the lnet_api_mutex held.
1424 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1426 lnet_nid_t old = lp->lp_primary_nid;
1429 if (lp->lp_primary_nid == nid)
1431 rc = lnet_peer_add_nid(lp, nid, flags);
1434 lp->lp_primary_nid = nid;
1436 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1437 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1442 * lpni creation initiated due to traffic either sending or receiving.
1445 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1447 struct lnet_peer *lp;
1448 struct lnet_peer_net *lpn;
1449 struct lnet_peer_ni *lpni;
1453 if (nid == LNET_NID_ANY) {
1458 /* lnet_net_lock is not needed here because ln_api_lock is held */
1459 lpni = lnet_find_peer_ni_locked(nid);
1462 * We must have raced with another thread. Since we
1463 * know next to nothing about a peer_ni created by
1464 * traffic, we just assume everything is ok and
1467 lnet_peer_ni_decref_locked(lpni);
1471 /* Create peer, peer_net, and peer_ni. */
1473 lp = lnet_peer_alloc(nid);
1476 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1479 lpni = lnet_peer_ni_alloc(nid);
1482 if (pref != LNET_NID_ANY)
1483 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1485 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1488 LIBCFS_FREE(lpn, sizeof(*lpn));
1490 LIBCFS_FREE(lp, sizeof(*lp));
1492 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1497 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1499 * This API handles the following combinations:
1500 * Create a peer with its primary NI if only the prim_nid is provided
1501 * Add a NID to a peer identified by the prim_nid. The peer identified
1502 * by the prim_nid must already exist.
1503 * The peer being created may be non-MR.
1505 * The caller must hold ln_api_mutex. This prevents the peer from
1506 * being created/modified/deleted by a different thread.
1509 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1511 struct lnet_peer *lp = NULL;
1512 struct lnet_peer_ni *lpni;
1515 /* The prim_nid must always be specified */
1516 if (prim_nid == LNET_NID_ANY)
1519 flags = LNET_PEER_CONFIGURED;
1521 flags |= LNET_PEER_MULTI_RAIL;
1524 * If nid isn't specified, we must create a new peer with
1525 * prim_nid as its primary nid.
1527 if (nid == LNET_NID_ANY)
1528 return lnet_peer_add(prim_nid, flags);
1530 /* Look up the prim_nid, which must exist. */
1531 lpni = lnet_find_peer_ni_locked(prim_nid);
1534 lnet_peer_ni_decref_locked(lpni);
1535 lp = lpni->lpni_peer_net->lpn_peer;
1537 /* Peer must have been configured. */
1538 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1539 CDEBUG(D_NET, "peer %s was not configured\n",
1540 libcfs_nid2str(prim_nid));
1544 /* Primary NID must match */
1545 if (lp->lp_primary_nid != prim_nid) {
1546 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1547 libcfs_nid2str(prim_nid),
1548 libcfs_nid2str(lp->lp_primary_nid));
1552 /* Multi-Rail flag must match. */
1553 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1554 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1555 libcfs_nid2str(prim_nid));
1559 return lnet_peer_add_nid(lp, nid, flags);
1563 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1565 * This API handles the following combinations:
1566 * Delete a NI from a peer if both prim_nid and nid are provided.
1567 * Delete a peer if only prim_nid is provided.
1568 * Delete a peer if its primary nid is provided.
1570 * The caller must hold ln_api_mutex. This prevents the peer from
1571 * being modified/deleted by a different thread.
1574 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1576 struct lnet_peer *lp;
1577 struct lnet_peer_ni *lpni;
1580 if (prim_nid == LNET_NID_ANY)
1583 lpni = lnet_find_peer_ni_locked(prim_nid);
1586 lnet_peer_ni_decref_locked(lpni);
1587 lp = lpni->lpni_peer_net->lpn_peer;
1589 if (prim_nid != lp->lp_primary_nid) {
1590 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1591 libcfs_nid2str(prim_nid),
1592 libcfs_nid2str(lp->lp_primary_nid));
1596 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1597 return lnet_peer_del(lp);
1599 flags = LNET_PEER_CONFIGURED;
1600 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1601 flags |= LNET_PEER_MULTI_RAIL;
1603 return lnet_peer_del_nid(lp, nid, flags);
1607 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
1609 struct lnet_peer_table *ptable;
1610 struct lnet_peer_net *lpn;
1612 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1614 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
1615 LASSERT(lpni->lpni_rtr_refcount == 0);
1616 LASSERT(list_empty(&lpni->lpni_txq));
1617 LASSERT(lpni->lpni_txqnob == 0);
1618 LASSERT(list_empty(&lpni->lpni_peer_nis));
1619 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1621 lpn = lpni->lpni_peer_net;
1622 lpni->lpni_peer_net = NULL;
1623 lpni->lpni_net = NULL;
1625 /* remove the peer ni from the zombie list */
1626 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1627 spin_lock(&ptable->pt_zombie_lock);
1628 list_del_init(&lpni->lpni_hashlist);
1629 ptable->pt_zombies--;
1630 spin_unlock(&ptable->pt_zombie_lock);
1632 if (lpni->lpni_pref_nnids > 1) {
1633 LIBCFS_FREE(lpni->lpni_pref.nids,
1634 sizeof(*lpni->lpni_pref.nids) * lpni->lpni_pref_nnids);
1636 LIBCFS_FREE(lpni, sizeof(*lpni));
1638 lnet_peer_net_decref_locked(lpn);
1641 struct lnet_peer_ni *
1642 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1644 struct lnet_peer_ni *lpni = NULL;
1647 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1648 return ERR_PTR(-ESHUTDOWN);
1651 * find if a peer_ni already exists.
1652 * If so then just return that.
1654 lpni = lnet_find_peer_ni_locked(nid);
1658 lnet_net_unlock(cpt);
1660 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1663 goto out_net_relock;
1666 lpni = lnet_find_peer_ni_locked(nid);
1676 * Get a peer_ni for the given nid, create it if necessary. Takes a
1677 * hold on the peer_ni.
1679 struct lnet_peer_ni *
1680 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1682 struct lnet_peer_ni *lpni = NULL;
1685 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1686 return ERR_PTR(-ESHUTDOWN);
1689 * find if a peer_ni already exists.
1690 * If so then just return that.
1692 lpni = lnet_find_peer_ni_locked(nid);
1698 * use the lnet_api_mutex to serialize the creation of the peer_ni
1699 * and the creation/deletion of the local ni/net. When a local ni is
1700 * created, if there exists a set of peer_nis on that network,
1701 * they need to be traversed and updated. When a local NI is
1702 * deleted, which could result in a network being deleted, then
1703 * all peer nis on that network need to be removed as well.
1705 * Creation through traffic should also be serialized with
1706 * creation through DLC.
1708 lnet_net_unlock(cpt);
1709 mutex_lock(&the_lnet.ln_api_mutex);
1711 * Shutdown is only set under the ln_api_lock, so a single
1712 * check here is sufficent.
1714 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1715 lpni = ERR_PTR(-ESHUTDOWN);
1716 goto out_mutex_unlock;
1719 rc = lnet_peer_ni_traffic_add(nid, pref);
1722 goto out_mutex_unlock;
1725 lpni = lnet_find_peer_ni_locked(nid);
1729 mutex_unlock(&the_lnet.ln_api_mutex);
1732 /* Lock has been dropped, check again for shutdown. */
1733 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1735 lnet_peer_ni_decref_locked(lpni);
1736 lpni = ERR_PTR(-ESHUTDOWN);
1743 * Is a peer uptodate from the point of view of discovery?
1745 * If it is currently being processed, obviously not.
1746 * A forced Ping or Push is also handled by the discovery thread.
1748 * Otherwise look at whether the peer needs rediscovering.
1751 lnet_peer_is_uptodate(struct lnet_peer *lp)
1755 spin_lock(&lp->lp_lock);
1756 if (lp->lp_state & (LNET_PEER_DISCOVERING |
1757 LNET_PEER_FORCE_PING |
1758 LNET_PEER_FORCE_PUSH)) {
1760 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
1762 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
1763 if (lnet_peer_discovery_disabled)
1767 } else if (lnet_peer_needs_push(lp)) {
1769 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
1770 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
1777 spin_unlock(&lp->lp_lock);
1783 * Queue a peer for the attention of the discovery thread. Call with
1784 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
1785 * -EALREADY if the peer was already queued.
1787 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
1791 spin_lock(&lp->lp_lock);
1792 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
1793 lp->lp_state |= LNET_PEER_DISCOVERING;
1794 spin_unlock(&lp->lp_lock);
1795 if (list_empty(&lp->lp_dc_list)) {
1796 lnet_peer_addref_locked(lp);
1797 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
1798 wake_up(&the_lnet.ln_dc_waitq);
1804 CDEBUG(D_NET, "Queue peer %s: %d\n",
1805 libcfs_nid2str(lp->lp_primary_nid), rc);
1811 * Discovery of a peer is complete. Wake all waiters on the peer.
1812 * Call with lnet_net_lock/EX held.
1814 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
1816 struct lnet_msg *msg, *tmp;
1818 struct list_head pending_msgs;
1820 INIT_LIST_HEAD(&pending_msgs);
1822 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
1823 libcfs_nid2str(lp->lp_primary_nid));
1825 list_del_init(&lp->lp_dc_list);
1826 spin_lock(&lp->lp_lock);
1827 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
1828 spin_unlock(&lp->lp_lock);
1829 wake_up_all(&lp->lp_dc_waitq);
1831 lnet_net_unlock(LNET_LOCK_EX);
1833 /* iterate through all pending messages and send them again */
1834 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
1835 list_del_init(&msg->msg_list);
1836 if (lp->lp_dc_error) {
1837 lnet_finalize(msg, lp->lp_dc_error);
1841 CDEBUG(D_NET, "sending pending message %s to target %s\n",
1842 lnet_msgtyp2str(msg->msg_type),
1843 libcfs_id2str(msg->msg_target));
1844 rc = lnet_send(msg->msg_src_nid_param, msg,
1845 msg->msg_rtr_nid_param);
1847 CNETERR("Error sending %s to %s: %d\n",
1848 lnet_msgtyp2str(msg->msg_type),
1849 libcfs_id2str(msg->msg_target), rc);
1850 lnet_finalize(msg, rc);
1853 lnet_net_lock(LNET_LOCK_EX);
1854 lnet_peer_decref_locked(lp);
1858 * Handle inbound push.
1859 * Like any event handler, called with lnet_res_lock/CPT held.
1861 void lnet_peer_push_event(struct lnet_event *ev)
1863 struct lnet_ping_buffer *pbuf = ev->md.user_ptr;
1864 struct lnet_peer *lp;
1866 /* lnet_find_peer() adds a refcount */
1867 lp = lnet_find_peer(ev->source.nid);
1869 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
1870 libcfs_nid2str(ev->initiator.nid),
1871 libcfs_nid2str(ev->source.nid));
1875 /* Ensure peer state remains consistent while we modify it. */
1876 spin_lock(&lp->lp_lock);
1879 * If some kind of error happened the contents of the message
1880 * cannot be used. Clear the NIDS_UPTODATE and set the
1881 * FORCE_PING flag to trigger a ping.
1884 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1885 lp->lp_state |= LNET_PEER_FORCE_PING;
1886 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
1888 libcfs_nid2str(lp->lp_primary_nid),
1889 libcfs_nid2str(ev->source.nid));
1894 * A push with invalid or corrupted info. Clear the UPTODATE
1895 * flag to trigger a ping.
1897 if (lnet_ping_info_validate(&pbuf->pb_info)) {
1898 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1899 lp->lp_state |= LNET_PEER_FORCE_PING;
1900 CDEBUG(D_NET, "Corrupted Push from %s\n",
1901 libcfs_nid2str(lp->lp_primary_nid));
1906 * Make sure we'll allocate the correct size ping buffer when
1909 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
1910 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
1913 * A non-Multi-Rail peer is not supposed to be capable of
1916 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
1917 CERROR("Push from non-Multi-Rail peer %s dropped\n",
1918 libcfs_nid2str(lp->lp_primary_nid));
1923 * The peer may have discovery disabled at its end. Set
1924 * NO_DISCOVERY as appropriate.
1926 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
1927 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
1928 libcfs_nid2str(lp->lp_primary_nid));
1929 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
1930 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
1931 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
1932 libcfs_nid2str(lp->lp_primary_nid));
1933 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
1937 * Update the MULTI_RAIL flag based on the push. If the peer
1938 * was configured with DLC then the setting should match what
1940 * NB: We verified above that the MR feature bit is set in pi_features
1942 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1943 CDEBUG(D_NET, "peer %s(%p) is MR\n",
1944 libcfs_nid2str(lp->lp_primary_nid), lp);
1945 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
1946 CWARN("Push says %s is Multi-Rail, DLC says not\n",
1947 libcfs_nid2str(lp->lp_primary_nid));
1948 } else if (lnet_peer_discovery_disabled) {
1949 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled locally\n",
1950 libcfs_nid2str(lp->lp_primary_nid), lp);
1951 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
1952 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled remotely\n",
1953 libcfs_nid2str(lp->lp_primary_nid), lp);
1955 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
1956 libcfs_nid2str(lp->lp_primary_nid), lp);
1957 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1958 lnet_peer_clr_non_mr_pref_nids(lp);
1962 * Check for truncation of the Put message. Clear the
1963 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
1964 * and tell discovery to allocate a bigger buffer.
1966 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
1967 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
1968 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
1969 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1970 lp->lp_state |= LNET_PEER_FORCE_PING;
1971 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
1972 libcfs_nid2str(lp->lp_primary_nid),
1973 pbuf->pb_info.pi_nnis);
1977 /* always assume new data */
1978 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
1979 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1982 * If there is data present that hasn't been processed yet,
1983 * we'll replace it if the Put contained newer data and it
1984 * fits. We're racing with a Ping or earlier Push in this
1987 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
1988 if (LNET_PING_BUFFER_SEQNO(pbuf) >
1989 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
1990 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
1991 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
1992 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
1993 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
1994 libcfs_nid2str(lp->lp_primary_nid),
1995 LNET_PING_BUFFER_SEQNO(pbuf),
1996 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2002 * Allocate a buffer to copy the data. On a failure we drop
2003 * the Push and set FORCE_PING to force the discovery
2004 * thread to fix the problem by pinging the peer.
2006 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2008 lp->lp_state |= LNET_PEER_FORCE_PING;
2009 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2010 libcfs_nid2str(lp->lp_primary_nid),
2011 LNET_PING_BUFFER_SEQNO(pbuf));
2016 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2017 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2018 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2019 CDEBUG(D_NET, "Received Push %s %u\n",
2020 libcfs_nid2str(lp->lp_primary_nid),
2021 LNET_PING_BUFFER_SEQNO(pbuf));
2025 * Queue the peer for discovery if not done, force it on the request
2026 * queue and wake the discovery thread if the peer was already queued,
2027 * because its status changed.
2029 spin_unlock(&lp->lp_lock);
2030 lnet_net_lock(LNET_LOCK_EX);
2031 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2032 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2033 wake_up(&the_lnet.ln_dc_waitq);
2035 /* Drop refcount from lookup */
2036 lnet_peer_decref_locked(lp);
2037 lnet_net_unlock(LNET_LOCK_EX);
2041 * Clear the discovery error state, unless we're already discovering
2042 * this peer, in which case the error is current.
2044 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2046 spin_lock(&lp->lp_lock);
2047 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2048 lp->lp_dc_error = 0;
2049 spin_unlock(&lp->lp_lock);
2053 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2054 * dropped/retaken within this function. An lnet_peer_ni is passed in
2055 * because discovery could tear down an lnet_peer.
2058 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2061 struct lnet_peer *lp;
2066 lnet_net_unlock(cpt);
2067 lnet_net_lock(LNET_LOCK_EX);
2068 lp = lpni->lpni_peer_net->lpn_peer;
2069 lnet_peer_clear_discovery_error(lp);
2072 * We're willing to be interrupted. The lpni can become a
2073 * zombie if we race with DLC, so we must check for that.
2076 /* Keep lp alive when the lnet_net_lock is unlocked */
2077 lnet_peer_addref_locked(lp);
2078 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2079 if (signal_pending(current))
2081 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2084 * Don't repeat discovery if discovery is disabled. This is
2085 * done to ensure we can use discovery as a standard ping as
2086 * well for backwards compatibility with routers which do not
2087 * have discovery or have discovery disabled
2089 if (lnet_is_discovery_disabled(lp) && count > 0)
2091 if (lp->lp_dc_error)
2093 if (lnet_peer_is_uptodate(lp))
2095 lnet_peer_queue_for_discovery(lp);
2097 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2100 * If caller requested a non-blocking operation then
2101 * return immediately. Once discovery is complete any
2102 * pending messages that were stopped due to discovery
2103 * will be transmitted.
2108 lnet_net_unlock(LNET_LOCK_EX);
2110 finish_wait(&lp->lp_dc_waitq, &wait);
2111 lnet_net_lock(LNET_LOCK_EX);
2112 lnet_peer_decref_locked(lp);
2113 /* Peer may have changed */
2114 lp = lpni->lpni_peer_net->lpn_peer;
2116 finish_wait(&lp->lp_dc_waitq, &wait);
2118 lnet_net_unlock(LNET_LOCK_EX);
2120 lnet_peer_decref_locked(lp);
2122 * The peer may have changed, so re-check and rediscover if that turns
2123 * out to have been the case. The reference count on lp ensured that
2124 * even if it was unlinked from lpni the memory could not be recycled.
2125 * Thus the check below is sufficient to determine whether the peer
2126 * changed. If the peer changed, then lp must not be dereferenced.
2128 if (lp != lpni->lpni_peer_net->lpn_peer)
2131 if (signal_pending(current))
2133 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2135 else if (lp->lp_dc_error)
2136 rc = lp->lp_dc_error;
2138 CDEBUG(D_NET, "non-blocking discovery\n");
2139 else if (!lnet_peer_is_uptodate(lp))
2142 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2143 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2144 libcfs_nid2str(lpni->lpni_nid), rc,
2145 (!block) ? "pending discovery" : "discovery complete");
2150 /* Handle an incoming ack for a push. */
2152 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2154 struct lnet_ping_buffer *pbuf;
2156 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2157 spin_lock(&lp->lp_lock);
2158 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2159 lp->lp_push_error = ev->status;
2161 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2163 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2164 spin_unlock(&lp->lp_lock);
2166 CDEBUG(D_NET, "peer %s ev->status %d\n",
2167 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2170 /* Handle a Reply message. This is the reply to a Ping message. */
2172 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2174 struct lnet_ping_buffer *pbuf;
2177 spin_lock(&lp->lp_lock);
2179 lp->lp_disc_src_nid = ev->target.nid;
2182 * If some kind of error happened the contents of message
2183 * cannot be used. Set PING_FAILED to trigger a retry.
2186 lp->lp_state |= LNET_PEER_PING_FAILED;
2187 lp->lp_ping_error = ev->status;
2188 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2190 libcfs_nid2str(lp->lp_primary_nid),
2191 libcfs_nid2str(ev->source.nid));
2195 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2196 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2197 lnet_swap_pinginfo(pbuf);
2200 * A reply with invalid or corrupted info. Set PING_FAILED to
2203 rc = lnet_ping_info_validate(&pbuf->pb_info);
2205 lp->lp_state |= LNET_PEER_PING_FAILED;
2206 lp->lp_ping_error = 0;
2207 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2208 libcfs_nid2str(lp->lp_primary_nid), rc);
2213 * Update the MULTI_RAIL flag based on the reply. If the peer
2214 * was configured with DLC then the setting should match what
2217 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2218 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2219 /* Everything's fine */
2220 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2221 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2222 libcfs_nid2str(lp->lp_primary_nid));
2224 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2225 lnet_peer_clr_non_mr_pref_nids(lp);
2227 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2228 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2229 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2230 libcfs_nid2str(lp->lp_primary_nid));
2232 CERROR("Multi-Rail state vanished from %s\n",
2233 libcfs_nid2str(lp->lp_primary_nid));
2234 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2239 * Make sure we'll allocate the correct size ping buffer when
2242 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2243 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2246 * The peer may have discovery disabled at its end. Set
2247 * NO_DISCOVERY as appropriate.
2249 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2250 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2251 libcfs_nid2str(lp->lp_primary_nid));
2252 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2253 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2254 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2255 libcfs_nid2str(lp->lp_primary_nid));
2256 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2260 * Check for truncation of the Reply. Clear PING_SENT and set
2261 * PING_FAILED to trigger a retry.
2263 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2264 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2265 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2266 lp->lp_state |= LNET_PEER_PING_FAILED;
2267 lp->lp_ping_error = 0;
2268 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2269 libcfs_nid2str(lp->lp_primary_nid),
2270 pbuf->pb_info.pi_nnis);
2275 * Check the sequence numbers in the reply. These are only
2276 * available if the reply came from a Multi-Rail peer.
2278 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2279 pbuf->pb_info.pi_nnis > 1 &&
2280 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2281 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2282 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2283 libcfs_nid2str(lp->lp_primary_nid),
2284 LNET_PING_BUFFER_SEQNO(pbuf),
2287 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2290 /* We're happy with the state of the data in the buffer. */
2291 CDEBUG(D_NET, "peer %s data present %u\n",
2292 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno);
2293 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2294 lnet_ping_buffer_decref(lp->lp_data);
2296 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2297 lnet_ping_buffer_addref(pbuf);
2300 lp->lp_state &= ~LNET_PEER_PING_SENT;
2301 spin_unlock(&lp->lp_lock);
2305 * Send event handling. Only matters for error cases, where we clean
2306 * up state on the peer and peer_ni that would otherwise be updated in
2307 * the REPLY event handler for a successful Ping, and the ACK event
2308 * handler for a successful Push.
2311 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2318 spin_lock(&lp->lp_lock);
2319 if (ev->msg_type == LNET_MSG_GET) {
2320 lp->lp_state &= ~LNET_PEER_PING_SENT;
2321 lp->lp_state |= LNET_PEER_PING_FAILED;
2322 lp->lp_ping_error = ev->status;
2323 } else { /* ev->msg_type == LNET_MSG_PUT */
2324 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2325 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2326 lp->lp_push_error = ev->status;
2328 spin_unlock(&lp->lp_lock);
2329 rc = LNET_REDISCOVER_PEER;
2331 CDEBUG(D_NET, "%s Send to %s: %d\n",
2332 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2333 libcfs_nid2str(ev->target.nid), rc);
2338 * Unlink event handling. This event is only seen if a call to
2339 * LNetMDUnlink() caused the event to be unlinked. If this call was
2340 * made after the event was set up in LNetGet() or LNetPut() then we
2341 * assume the Ping or Push timed out.
2344 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2346 spin_lock(&lp->lp_lock);
2347 /* We've passed through LNetGet() */
2348 if (lp->lp_state & LNET_PEER_PING_SENT) {
2349 lp->lp_state &= ~LNET_PEER_PING_SENT;
2350 lp->lp_state |= LNET_PEER_PING_FAILED;
2351 lp->lp_ping_error = -ETIMEDOUT;
2352 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2353 libcfs_nid2str(lp->lp_primary_nid));
2355 /* We've passed through LNetPut() */
2356 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2357 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2358 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2359 lp->lp_push_error = -ETIMEDOUT;
2360 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2361 libcfs_nid2str(lp->lp_primary_nid));
2363 spin_unlock(&lp->lp_lock);
2367 * Event handler for the discovery EQ.
2369 * Called with lnet_res_lock(cpt) held. The cpt is the
2370 * lnet_cpt_of_cookie() of the md handle cookie.
2372 static void lnet_discovery_event_handler(struct lnet_event *event)
2374 struct lnet_peer *lp = event->md.user_ptr;
2375 struct lnet_ping_buffer *pbuf;
2378 /* discovery needs to take another look */
2379 rc = LNET_REDISCOVER_PEER;
2381 CDEBUG(D_NET, "Received event: %d\n", event->type);
2383 switch (event->type) {
2384 case LNET_EVENT_ACK:
2385 lnet_discovery_event_ack(lp, event);
2387 case LNET_EVENT_REPLY:
2388 lnet_discovery_event_reply(lp, event);
2390 case LNET_EVENT_SEND:
2391 /* Only send failure triggers a retry. */
2392 rc = lnet_discovery_event_send(lp, event);
2394 case LNET_EVENT_UNLINK:
2395 /* LNetMDUnlink() was called */
2396 lnet_discovery_event_unlink(lp, event);
2399 /* Invalid events. */
2402 lnet_net_lock(LNET_LOCK_EX);
2403 if (event->unlinked) {
2404 pbuf = LNET_PING_INFO_TO_BUFFER(event->md.start);
2405 lnet_ping_buffer_decref(pbuf);
2406 lnet_peer_decref_locked(lp);
2409 /* put peer back at end of request queue, if discovery not already
2411 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2412 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2413 wake_up(&the_lnet.ln_dc_waitq);
2415 lnet_net_unlock(LNET_LOCK_EX);
2419 * Build a peer from incoming data.
2421 * The NIDs in the incoming data are supposed to be structured as follows:
2424 * - other NIDs in same net
2425 * - NIDs in second net
2426 * - NIDs in third net
2428 * This due to the way the list of NIDs in the data is created.
2430 * Note that this function will mark the peer uptodate unless an
2431 * ENOMEM is encontered. All other errors are due to a conflict
2432 * between the DLC configuration and what discovery sees. We treat DLC
2433 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2434 * peer from becoming stuck in discovery.
2436 static int lnet_peer_merge_data(struct lnet_peer *lp,
2437 struct lnet_ping_buffer *pbuf)
2439 struct lnet_peer_ni *lpni;
2440 lnet_nid_t *curnis = NULL;
2441 lnet_nid_t *addnis = NULL;
2442 lnet_nid_t *delnis = NULL;
2452 flags = LNET_PEER_DISCOVERED;
2453 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2454 flags |= LNET_PEER_MULTI_RAIL;
2456 nnis = MAX(lp->lp_nnis, pbuf->pb_info.pi_nnis);
2457 LIBCFS_ALLOC(curnis, nnis * sizeof(lnet_nid_t));
2458 LIBCFS_ALLOC(addnis, nnis * sizeof(lnet_nid_t));
2459 LIBCFS_ALLOC(delnis, nnis * sizeof(lnet_nid_t));
2460 if (!curnis || !addnis || !delnis) {
2468 /* Construct the list of NIDs present in peer. */
2470 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2471 curnis[ncurnis++] = lpni->lpni_nid;
2474 * Check for NIDs in pbuf not present in curnis[].
2475 * The loop starts at 1 to skip the loopback NID.
2477 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2478 for (j = 0; j < ncurnis; j++)
2479 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2482 addnis[naddnis++] = pbuf->pb_info.pi_ni[i].ns_nid;
2485 * Check for NIDs in curnis[] not present in pbuf.
2486 * The nested loop starts at 1 to skip the loopback NID.
2488 * But never add the loopback NID to delnis[]: if it is
2489 * present in curnis[] then this peer is for this node.
2491 for (i = 0; i < ncurnis; i++) {
2492 if (curnis[i] == LNET_NID_LO_0)
2494 for (j = 1; j < pbuf->pb_info.pi_nnis; j++)
2495 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid)
2497 if (j == pbuf->pb_info.pi_nnis)
2498 delnis[ndelnis++] = curnis[i];
2501 for (i = 0; i < naddnis; i++) {
2502 rc = lnet_peer_add_nid(lp, addnis[i], flags);
2504 CERROR("Error adding NID %s to peer %s: %d\n",
2505 libcfs_nid2str(addnis[i]),
2506 libcfs_nid2str(lp->lp_primary_nid), rc);
2511 for (i = 0; i < ndelnis; i++) {
2512 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2514 CERROR("Error deleting NID %s from peer %s: %d\n",
2515 libcfs_nid2str(delnis[i]),
2516 libcfs_nid2str(lp->lp_primary_nid), rc);
2522 * Errors other than -ENOMEM are due to peers having been
2523 * configured with DLC. Ignore these because DLC overrides
2528 LIBCFS_FREE(curnis, nnis * sizeof(lnet_nid_t));
2529 LIBCFS_FREE(addnis, nnis * sizeof(lnet_nid_t));
2530 LIBCFS_FREE(delnis, nnis * sizeof(lnet_nid_t));
2531 lnet_ping_buffer_decref(pbuf);
2532 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
2535 spin_lock(&lp->lp_lock);
2536 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2537 lp->lp_state |= LNET_PEER_FORCE_PING;
2538 spin_unlock(&lp->lp_lock);
2544 * The data in pbuf says lp is its primary peer, but the data was
2545 * received by a different peer. Try to update lp with the data.
2548 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2550 struct lnet_handle_md mdh;
2552 /* Queue lp for discovery, and force it on the request queue. */
2553 lnet_net_lock(LNET_LOCK_EX);
2554 if (lnet_peer_queue_for_discovery(lp))
2555 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2556 lnet_net_unlock(LNET_LOCK_EX);
2558 LNetInvalidateMDHandle(&mdh);
2561 * Decide whether we can move the peer to the DATA_PRESENT state.
2563 * We replace stale data for a multi-rail peer, repair PING_FAILED
2564 * status, and preempt FORCE_PING.
2566 * If after that we have DATA_PRESENT, we merge it into this peer.
2568 spin_lock(&lp->lp_lock);
2569 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2570 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2571 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2572 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2573 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2574 lnet_ping_buffer_decref(pbuf);
2579 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2580 lnet_ping_buffer_decref(lp->lp_data);
2582 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2584 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2585 mdh = lp->lp_ping_mdh;
2586 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2587 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2588 lp->lp_ping_error = 0;
2590 if (lp->lp_state & LNET_PEER_FORCE_PING)
2591 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2592 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2593 spin_unlock(&lp->lp_lock);
2595 if (!LNetMDHandleIsInvalid(mdh))
2599 return lnet_peer_merge_data(lp, pbuf);
2601 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2606 * Update a peer using the data received.
2608 static int lnet_peer_data_present(struct lnet_peer *lp)
2609 __must_hold(&lp->lp_lock)
2611 struct lnet_ping_buffer *pbuf;
2612 struct lnet_peer_ni *lpni;
2613 lnet_nid_t nid = LNET_NID_ANY;
2619 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2620 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2621 spin_unlock(&lp->lp_lock);
2624 * Modifications of peer structures are done while holding the
2625 * ln_api_mutex. A global lock is required because we may be
2626 * modifying multiple peer structures, and a mutex greatly
2627 * simplifies memory management.
2629 * The actual changes to the data structures must also protect
2630 * against concurrent lookups, for which the lnet_net_lock in
2631 * LNET_LOCK_EX mode is used.
2633 mutex_lock(&the_lnet.ln_api_mutex);
2634 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2640 * If this peer is not on the peer list then it is being torn
2641 * down, and our reference count may be all that is keeping it
2642 * alive. Don't do any work on it.
2644 if (list_empty(&lp->lp_peer_list))
2647 flags = LNET_PEER_DISCOVERED;
2648 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2649 flags |= LNET_PEER_MULTI_RAIL;
2652 * Check whether the primary NID in the message matches the
2653 * primary NID of the peer. If it does, update the peer, if
2654 * it it does not, check whether there is already a peer with
2655 * that primary NID. If no such peer exists, try to update
2656 * the primary NID of the current peer (allowed if it was
2657 * created due to message traffic) and complete the update.
2658 * If the peer did exist, hand off the data to it.
2660 * The peer for the loopback interface is a special case: this
2661 * is the peer for the local node, and we want to set its
2662 * primary NID to the correct value here. Moreover, this peer
2663 * can show up with only the loopback NID in the ping buffer.
2665 if (pbuf->pb_info.pi_nnis <= 1)
2667 nid = pbuf->pb_info.pi_ni[1].ns_nid;
2668 if (lp->lp_primary_nid == LNET_NID_LO_0) {
2669 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2671 rc = lnet_peer_merge_data(lp, pbuf);
2672 } else if (lp->lp_primary_nid == nid) {
2673 rc = lnet_peer_merge_data(lp, pbuf);
2675 lpni = lnet_find_peer_ni_locked(nid);
2677 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2679 CERROR("Primary NID error %s versus %s: %d\n",
2680 libcfs_nid2str(lp->lp_primary_nid),
2681 libcfs_nid2str(nid), rc);
2683 rc = lnet_peer_merge_data(lp, pbuf);
2686 rc = lnet_peer_set_primary_data(
2687 lpni->lpni_peer_net->lpn_peer, pbuf);
2688 lnet_peer_ni_decref_locked(lpni);
2692 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
2693 mutex_unlock(&the_lnet.ln_api_mutex);
2695 spin_lock(&lp->lp_lock);
2696 /* Tell discovery to re-check the peer immediately. */
2698 rc = LNET_REDISCOVER_PEER;
2703 * A ping failed. Clear the PING_FAILED state and set the
2704 * FORCE_PING state, to ensure a retry even if discovery is
2705 * disabled. This avoids being left with incorrect state.
2707 static int lnet_peer_ping_failed(struct lnet_peer *lp)
2708 __must_hold(&lp->lp_lock)
2710 struct lnet_handle_md mdh;
2713 mdh = lp->lp_ping_mdh;
2714 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2715 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2716 lp->lp_state |= LNET_PEER_FORCE_PING;
2717 rc = lp->lp_ping_error;
2718 lp->lp_ping_error = 0;
2719 spin_unlock(&lp->lp_lock);
2721 if (!LNetMDHandleIsInvalid(mdh))
2724 CDEBUG(D_NET, "peer %s:%d\n",
2725 libcfs_nid2str(lp->lp_primary_nid), rc);
2727 spin_lock(&lp->lp_lock);
2728 return rc ? rc : LNET_REDISCOVER_PEER;
2732 * Select NID to send a Ping or Push to.
2734 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
2736 struct lnet_peer_ni *lpni;
2738 /* Look for a direct-connected NID for this peer. */
2740 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2741 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
2746 return lpni->lpni_nid;
2748 /* Look for a routed-connected NID for this peer. */
2750 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2751 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
2756 return lpni->lpni_nid;
2758 return LNET_NID_ANY;
2761 /* Active side of ping. */
2762 static int lnet_peer_send_ping(struct lnet_peer *lp)
2763 __must_hold(&lp->lp_lock)
2770 lp->lp_state |= LNET_PEER_PING_SENT;
2771 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2772 spin_unlock(&lp->lp_lock);
2774 cpt = lnet_net_lock_current();
2775 /* Refcount for MD. */
2776 lnet_peer_addref_locked(lp);
2777 pnid = lnet_peer_select_nid(lp);
2778 lnet_net_unlock(cpt);
2780 nnis = MAX(lp->lp_data_nnis, LNET_INTERFACES_MIN);
2782 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
2783 the_lnet.ln_dc_eqh, false);
2786 * if LNetMDBind in lnet_send_ping fails we need to decrement the
2787 * refcount on the peer, otherwise LNetMDUnlink will be called
2788 * which will eventually do that.
2792 lnet_peer_decref_locked(lp);
2793 lnet_net_unlock(cpt);
2794 rc = -rc; /* change the rc to negative value */
2796 } else if (rc < 0) {
2800 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2802 spin_lock(&lp->lp_lock);
2806 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
2808 * The errors that get us here are considered hard errors and
2809 * cause Discovery to terminate. So we clear PING_SENT, but do
2810 * not set either PING_FAILED or FORCE_PING. In fact we need
2811 * to clear PING_FAILED, because the unlink event handler will
2812 * have set it if we called LNetMDUnlink() above.
2814 spin_lock(&lp->lp_lock);
2815 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
2820 * This function exists because you cannot call LNetMDUnlink() from an
2823 static int lnet_peer_push_failed(struct lnet_peer *lp)
2824 __must_hold(&lp->lp_lock)
2826 struct lnet_handle_md mdh;
2829 mdh = lp->lp_push_mdh;
2830 LNetInvalidateMDHandle(&lp->lp_push_mdh);
2831 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
2832 rc = lp->lp_push_error;
2833 lp->lp_push_error = 0;
2834 spin_unlock(&lp->lp_lock);
2836 if (!LNetMDHandleIsInvalid(mdh))
2839 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2840 spin_lock(&lp->lp_lock);
2841 return rc ? rc : LNET_REDISCOVER_PEER;
2844 /* Active side of push. */
2845 static int lnet_peer_send_push(struct lnet_peer *lp)
2846 __must_hold(&lp->lp_lock)
2848 struct lnet_ping_buffer *pbuf;
2849 struct lnet_process_id id;
2854 /* Don't push to a non-multi-rail peer. */
2855 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
2856 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
2860 lp->lp_state |= LNET_PEER_PUSH_SENT;
2861 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
2862 spin_unlock(&lp->lp_lock);
2864 cpt = lnet_net_lock_current();
2865 pbuf = the_lnet.ln_ping_target;
2866 lnet_ping_buffer_addref(pbuf);
2867 lnet_net_unlock(cpt);
2869 /* Push source MD */
2870 md.start = &pbuf->pb_info;
2871 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
2872 md.threshold = 2; /* Put/Ack */
2875 md.eq_handle = the_lnet.ln_dc_eqh;
2878 rc = LNetMDBind(md, LNET_UNLINK, &lp->lp_push_mdh);
2880 lnet_ping_buffer_decref(pbuf);
2881 CERROR("Can't bind push source MD: %d\n", rc);
2884 cpt = lnet_net_lock_current();
2885 /* Refcount for MD. */
2886 lnet_peer_addref_locked(lp);
2887 id.pid = LNET_PID_LUSTRE;
2888 id.nid = lnet_peer_select_nid(lp);
2889 lnet_net_unlock(cpt);
2891 if (id.nid == LNET_NID_ANY) {
2896 rc = LNetPut(lp->lp_disc_src_nid, lp->lp_push_mdh,
2897 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
2898 LNET_PROTO_PING_MATCHBITS, 0, 0);
2901 * reset the discovery nid. There is no need to restrict sending
2902 * from that source, if we call lnet_push_update_to_peers(). It'll
2903 * get set to a specific NID, if we initiate discovery from the
2906 lp->lp_disc_src_nid = LNET_NID_ANY;
2911 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2913 spin_lock(&lp->lp_lock);
2917 LNetMDUnlink(lp->lp_push_mdh);
2918 LNetInvalidateMDHandle(&lp->lp_push_mdh);
2920 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
2922 * The errors that get us here are considered hard errors and
2923 * cause Discovery to terminate. So we clear PUSH_SENT, but do
2924 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
2925 * because the unlink event handler will have set it if we
2926 * called LNetMDUnlink() above.
2928 spin_lock(&lp->lp_lock);
2929 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
2934 * An unrecoverable error was encountered during discovery.
2935 * Set error status in peer and abort discovery.
2937 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
2939 CDEBUG(D_NET, "Discovery error %s: %d\n",
2940 libcfs_nid2str(lp->lp_primary_nid), error);
2942 spin_lock(&lp->lp_lock);
2943 lp->lp_dc_error = error;
2944 lp->lp_state &= ~LNET_PEER_DISCOVERING;
2945 lp->lp_state |= LNET_PEER_REDISCOVER;
2946 spin_unlock(&lp->lp_lock);
2950 * Mark the peer as discovered.
2952 static int lnet_peer_discovered(struct lnet_peer *lp)
2953 __must_hold(&lp->lp_lock)
2955 lp->lp_state |= LNET_PEER_DISCOVERED;
2956 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
2957 LNET_PEER_REDISCOVER);
2959 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2965 * Mark the peer as to be rediscovered.
2967 static int lnet_peer_rediscover(struct lnet_peer *lp)
2968 __must_hold(&lp->lp_lock)
2970 lp->lp_state |= LNET_PEER_REDISCOVER;
2971 lp->lp_state &= ~LNET_PEER_DISCOVERING;
2973 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2979 * Discovering this peer is taking too long. Cancel any Ping or Push
2980 * that discovery is waiting on by unlinking the relevant MDs. The
2981 * lnet_discovery_event_handler() will proceed from here and complete
2984 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
2986 struct lnet_handle_md ping_mdh;
2987 struct lnet_handle_md push_mdh;
2989 LNetInvalidateMDHandle(&ping_mdh);
2990 LNetInvalidateMDHandle(&push_mdh);
2992 spin_lock(&lp->lp_lock);
2993 if (lp->lp_state & LNET_PEER_PING_SENT) {
2994 ping_mdh = lp->lp_ping_mdh;
2995 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2997 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2998 push_mdh = lp->lp_push_mdh;
2999 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3001 spin_unlock(&lp->lp_lock);
3003 if (!LNetMDHandleIsInvalid(ping_mdh))
3004 LNetMDUnlink(ping_mdh);
3005 if (!LNetMDHandleIsInvalid(push_mdh))
3006 LNetMDUnlink(push_mdh);
3010 * Wait for work to be queued or some other change that must be
3011 * attended to. Returns non-zero if the discovery thread should shut
3014 static int lnet_peer_discovery_wait_for_work(void)
3021 cpt = lnet_net_lock_current();
3023 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3024 TASK_INTERRUPTIBLE);
3025 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3027 if (lnet_push_target_resize_needed())
3029 if (!list_empty(&the_lnet.ln_dc_request))
3031 if (!list_empty(&the_lnet.ln_msg_resend))
3033 lnet_net_unlock(cpt);
3036 * wakeup max every second to check if there are peers that
3037 * have been stuck on the working queue for greater than
3040 schedule_timeout(cfs_time_seconds(1));
3041 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3042 cpt = lnet_net_lock_current();
3044 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3046 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3049 lnet_net_unlock(cpt);
3051 CDEBUG(D_NET, "woken: %d\n", rc);
3057 * Messages that were pending on a destroyed peer will be put on a global
3058 * resend list. The message resend list will be checked by
3059 * the discovery thread when it wakes up, and will resend messages. These
3060 * messages can still be sendable in the case the lpni which was the initial
3061 * cause of the message re-queue was transfered to another peer.
3063 * It is possible that LNet could be shutdown while we're iterating
3064 * through the list. lnet_shudown_lndnets() will attempt to access the
3065 * resend list, but will have to wait until the spinlock is released, by
3066 * which time there shouldn't be any more messages on the resend list.
3067 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3068 * for the messages so they can be released. The other case is that
3069 * lnet_shudown_lndnets() can finalize all the messages before this
3070 * function can visit the resend list, in which case this function will be
3073 static void lnet_resend_msgs(void)
3075 struct lnet_msg *msg, *tmp;
3076 struct list_head resend;
3079 INIT_LIST_HEAD(&resend);
3081 spin_lock(&the_lnet.ln_msg_resend_lock);
3082 list_splice(&the_lnet.ln_msg_resend, &resend);
3083 spin_unlock(&the_lnet.ln_msg_resend_lock);
3085 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3086 list_del_init(&msg->msg_list);
3087 rc = lnet_send(msg->msg_src_nid_param, msg,
3088 msg->msg_rtr_nid_param);
3090 CNETERR("Error sending %s to %s: %d\n",
3091 lnet_msgtyp2str(msg->msg_type),
3092 libcfs_id2str(msg->msg_target), rc);
3093 lnet_finalize(msg, rc);
3098 /* The discovery thread. */
3099 static int lnet_peer_discovery(void *arg)
3101 struct lnet_peer *lp;
3104 CDEBUG(D_NET, "started\n");
3105 cfs_block_allsigs();
3108 if (lnet_peer_discovery_wait_for_work())
3113 if (lnet_push_target_resize_needed())
3114 lnet_push_target_resize();
3116 lnet_net_lock(LNET_LOCK_EX);
3117 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3121 * Process all incoming discovery work requests. When
3122 * discovery must wait on a peer to change state, it
3123 * is added to the tail of the ln_dc_working queue. A
3124 * timestamp keeps track of when the peer was added,
3125 * so we can time out discovery requests that take too
3128 while (!list_empty(&the_lnet.ln_dc_request)) {
3129 lp = list_first_entry(&the_lnet.ln_dc_request,
3130 struct lnet_peer, lp_dc_list);
3131 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3133 * set the time the peer was put on the dc_working
3134 * queue. It shouldn't remain on the queue
3135 * forever, in case the GET message (for ping)
3136 * doesn't get a REPLY or the PUT message (for
3137 * push) doesn't get an ACK.
3139 lp->lp_last_queued = ktime_get_real_seconds();
3140 lnet_net_unlock(LNET_LOCK_EX);
3143 * Select an action depending on the state of
3144 * the peer and whether discovery is disabled.
3145 * The check whether discovery is disabled is
3146 * done after the code that handles processing
3147 * for arrived data, cleanup for failures, and
3148 * forcing a Ping or Push.
3150 spin_lock(&lp->lp_lock);
3151 CDEBUG(D_NET, "peer %s state %#x\n",
3152 libcfs_nid2str(lp->lp_primary_nid),
3154 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3155 rc = lnet_peer_data_present(lp);
3156 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3157 rc = lnet_peer_ping_failed(lp);
3158 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3159 rc = lnet_peer_push_failed(lp);
3160 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3161 rc = lnet_peer_send_ping(lp);
3162 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3163 rc = lnet_peer_send_push(lp);
3164 else if (lnet_peer_discovery_disabled)
3165 rc = lnet_peer_rediscover(lp);
3166 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3167 rc = lnet_peer_send_ping(lp);
3168 else if (lnet_peer_needs_push(lp))
3169 rc = lnet_peer_send_push(lp);
3171 rc = lnet_peer_discovered(lp);
3172 CDEBUG(D_NET, "peer %s state %#x rc %d\n",
3173 libcfs_nid2str(lp->lp_primary_nid),
3175 spin_unlock(&lp->lp_lock);
3177 lnet_net_lock(LNET_LOCK_EX);
3178 if (rc == LNET_REDISCOVER_PEER) {
3179 list_move(&lp->lp_dc_list,
3180 &the_lnet.ln_dc_request);
3182 lnet_peer_discovery_error(lp, rc);
3184 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3185 lnet_peer_discovery_complete(lp);
3186 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3190 lnet_net_unlock(LNET_LOCK_EX);
3193 CDEBUG(D_NET, "stopping\n");
3195 * Clean up before telling lnet_peer_discovery_stop() that
3196 * we're done. Use wake_up() below to somewhat reduce the
3197 * size of the thundering herd if there are multiple threads
3198 * waiting on discovery of a single peer.
3201 /* Queue cleanup 1: stop all pending pings and pushes. */
3202 lnet_net_lock(LNET_LOCK_EX);
3203 while (!list_empty(&the_lnet.ln_dc_working)) {
3204 lp = list_first_entry(&the_lnet.ln_dc_working,
3205 struct lnet_peer, lp_dc_list);
3206 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3207 lnet_net_unlock(LNET_LOCK_EX);
3208 lnet_peer_cancel_discovery(lp);
3209 lnet_net_lock(LNET_LOCK_EX);
3211 lnet_net_unlock(LNET_LOCK_EX);
3213 /* Queue cleanup 2: wait for the expired queue to clear. */
3214 while (!list_empty(&the_lnet.ln_dc_expired))
3215 schedule_timeout(cfs_time_seconds(1));
3217 /* Queue cleanup 3: clear the request queue. */
3218 lnet_net_lock(LNET_LOCK_EX);
3219 while (!list_empty(&the_lnet.ln_dc_request)) {
3220 lp = list_first_entry(&the_lnet.ln_dc_request,
3221 struct lnet_peer, lp_dc_list);
3222 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3223 lnet_peer_discovery_complete(lp);
3225 lnet_net_unlock(LNET_LOCK_EX);
3227 LNetEQFree(the_lnet.ln_dc_eqh);
3228 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3230 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3231 wake_up(&the_lnet.ln_dc_waitq);
3233 CDEBUG(D_NET, "stopped\n");
3238 /* ln_api_mutex is held on entry. */
3239 int lnet_peer_discovery_start(void)
3241 struct task_struct *task;
3244 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3247 rc = LNetEQAlloc(0, lnet_discovery_event_handler, &the_lnet.ln_dc_eqh);
3249 CERROR("Can't allocate discovery EQ: %d\n", rc);
3253 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3254 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3257 CERROR("Can't start peer discovery thread: %d\n", rc);
3259 LNetEQFree(the_lnet.ln_dc_eqh);
3260 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3262 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3265 CDEBUG(D_NET, "discovery start: %d\n", rc);
3270 /* ln_api_mutex is held on entry. */
3271 void lnet_peer_discovery_stop(void)
3273 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3276 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3277 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3278 wake_up(&the_lnet.ln_dc_waitq);
3280 wait_event(the_lnet.ln_dc_waitq,
3281 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3283 LASSERT(list_empty(&the_lnet.ln_dc_request));
3284 LASSERT(list_empty(&the_lnet.ln_dc_working));
3285 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3287 CDEBUG(D_NET, "discovery stopped\n");
3293 lnet_debug_peer(lnet_nid_t nid)
3295 char *aliveness = "NA";
3296 struct lnet_peer_ni *lp;
3299 cpt = lnet_cpt_of_nid(nid, NULL);
3302 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3304 lnet_net_unlock(cpt);
3305 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3309 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3310 aliveness = lp->lpni_alive ? "up" : "down";
3312 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3313 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
3314 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3315 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3316 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3318 lnet_peer_ni_decref_locked(lp);
3320 lnet_net_unlock(cpt);
3323 /* Gathering information for userspace. */
3325 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3326 char aliveness[LNET_MAX_STR_LEN],
3327 __u32 *cpt_iter, __u32 *refcount,
3328 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3329 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3330 __u32 *peer_tx_qnob)
3332 struct lnet_peer_table *peer_table;
3333 struct lnet_peer_ni *lp;
3338 /* get the number of CPTs */
3339 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3341 /* if the cpt number to be examined is >= the number of cpts in
3342 * the system then indicate that there are no more cpts to examin
3344 if (*cpt_iter >= lncpt)
3347 /* get the current table */
3348 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3349 /* if the ptable is NULL then there are no more cpts to examine */
3350 if (peer_table == NULL)
3353 lnet_net_lock(*cpt_iter);
3355 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3356 struct list_head *peers = &peer_table->pt_hash[j];
3358 list_for_each_entry(lp, peers, lpni_hashlist) {
3359 if (peer_index-- > 0)
3362 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3363 if (lnet_isrouter(lp) ||
3364 lnet_peer_aliveness_enabled(lp))
3365 snprintf(aliveness, LNET_MAX_STR_LEN,
3366 lp->lpni_alive ? "up" : "down");
3368 *nid = lp->lpni_nid;
3369 *refcount = atomic_read(&lp->lpni_refcount);
3370 *ni_peer_tx_credits =
3371 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3372 *peer_tx_credits = lp->lpni_txcredits;
3373 *peer_rtr_credits = lp->lpni_rtrcredits;
3374 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3375 *peer_tx_qnob = lp->lpni_txqnob;
3381 lnet_net_unlock(*cpt_iter);
3385 return found ? 0 : -ENOENT;
3388 /* ln_api_mutex is held, which keeps the peer list stable */
3389 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3391 struct lnet_ioctl_element_stats *lpni_stats;
3392 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3393 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3394 struct lnet_peer_ni_credit_info *lpni_info;
3395 struct lnet_peer_ni *lpni;
3396 struct lnet_peer *lp;
3401 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3408 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3409 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3410 size *= lp->lp_nnis;
3411 if (size > cfg->prcfg_size) {
3412 cfg->prcfg_size = size;
3417 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3418 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3419 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3420 cfg->prcfg_count = lp->lp_nnis;
3421 cfg->prcfg_size = size;
3422 cfg->prcfg_state = lp->lp_state;
3424 /* Allocate helper buffers. */
3426 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3429 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3432 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3433 if (!lpni_msg_stats)
3434 goto out_free_stats;
3435 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3437 goto out_free_msg_stats;
3442 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3443 nid = lpni->lpni_nid;
3444 if (copy_to_user(bulk, &nid, sizeof(nid)))
3445 goto out_free_hstats;
3446 bulk += sizeof(nid);
3448 memset(lpni_info, 0, sizeof(*lpni_info));
3449 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3450 if (lnet_isrouter(lpni) ||
3451 lnet_peer_aliveness_enabled(lpni))
3452 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3453 lpni->lpni_alive ? "up" : "down");
3455 lpni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
3456 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3457 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3458 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3459 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3460 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3461 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3462 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3463 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3464 goto out_free_hstats;
3465 bulk += sizeof(*lpni_info);
3467 memset(lpni_stats, 0, sizeof(*lpni_stats));
3468 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3469 LNET_STATS_TYPE_SEND);
3470 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3471 LNET_STATS_TYPE_RECV);
3472 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3473 LNET_STATS_TYPE_DROP);
3474 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3475 goto out_free_hstats;
3476 bulk += sizeof(*lpni_stats);
3477 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3478 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3479 goto out_free_hstats;
3480 bulk += sizeof(*lpni_msg_stats);
3481 lpni_hstats->hlpni_network_timeout =
3482 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3483 lpni_hstats->hlpni_remote_dropped =
3484 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3485 lpni_hstats->hlpni_remote_timeout =
3486 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3487 lpni_hstats->hlpni_remote_error =
3488 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3489 lpni_hstats->hlpni_health_value =
3490 atomic_read(&lpni->lpni_healthv);
3491 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3492 goto out_free_hstats;
3493 bulk += sizeof(*lpni_hstats);
3498 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3500 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3502 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3504 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
3506 lnet_peer_decref_locked(lp);
3512 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni)
3514 /* the mt could've shutdown and cleaned up the queues */
3515 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
3518 if (list_empty(&lpni->lpni_recovery) &&
3519 atomic_read(&lpni->lpni_healthv) < LNET_MAX_HEALTH_VALUE) {
3520 CDEBUG(D_NET, "lpni %s added to recovery queue. Health = %d\n",
3521 libcfs_nid2str(lpni->lpni_nid),
3522 atomic_read(&lpni->lpni_healthv));
3523 list_add_tail(&lpni->lpni_recovery, &the_lnet.ln_mt_peerNIRecovq);
3524 lnet_peer_ni_addref_locked(lpni);
3528 /* Call with the ln_api_mutex held */
3530 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3532 struct lnet_peer_table *ptable;
3533 struct lnet_peer *lp;
3534 struct lnet_peer_net *lpn;
3535 struct lnet_peer_ni *lpni;
3539 if (the_lnet.ln_state != LNET_STATE_RUNNING)
3543 lnet_net_lock(LNET_LOCK_EX);
3544 lpni = lnet_find_peer_ni_locked(nid);
3546 lnet_net_unlock(LNET_LOCK_EX);
3549 atomic_set(&lpni->lpni_healthv, value);
3550 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3551 lnet_peer_ni_decref_locked(lpni);
3552 lnet_net_unlock(LNET_LOCK_EX);
3556 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3559 * Walk all the peers and reset the healhv for each one to the
3562 lnet_net_lock(LNET_LOCK_EX);
3563 for (cpt = 0; cpt < lncpt; cpt++) {
3564 ptable = the_lnet.ln_peer_tables[cpt];
3565 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
3566 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
3567 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
3569 atomic_set(&lpni->lpni_healthv, value);
3570 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3575 lnet_net_unlock(LNET_LOCK_EX);