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_hashlist);
166 INIT_LIST_HEAD(&lpni->lpni_peer_nis);
167 INIT_LIST_HEAD(&lpni->lpni_recovery);
168 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
169 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
171 spin_lock_init(&lpni->lpni_lock);
173 if (lnet_peers_start_down())
174 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
176 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
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_rtrq);
252 INIT_LIST_HEAD(&lp->lp_routes);
253 INIT_LIST_HEAD(&lp->lp_peer_list);
254 INIT_LIST_HEAD(&lp->lp_peer_nets);
255 INIT_LIST_HEAD(&lp->lp_dc_list);
256 INIT_LIST_HEAD(&lp->lp_dc_pendq);
257 INIT_LIST_HEAD(&lp->lp_rtr_list);
258 init_waitqueue_head(&lp->lp_dc_waitq);
259 spin_lock_init(&lp->lp_lock);
260 lp->lp_primary_nid = nid;
261 if (lnet_peers_start_down())
262 lp->lp_alive = false;
267 * all peers created on a router should have health on
268 * if it's not already on.
270 if (the_lnet.ln_routing && !lnet_health_sensitivity)
271 lp->lp_health_sensitivity = 1;
274 * Turn off discovery for loopback peer. If you're creating a peer
275 * for the loopback interface then that was initiated when we
276 * attempted to send a message over the loopback. There is no need
277 * to ever use a different interface when sending messages to
280 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
281 lp->lp_state = LNET_PEER_NO_DISCOVERY;
282 lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
284 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
290 lnet_destroy_peer_locked(struct lnet_peer *lp)
292 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
294 LASSERT(atomic_read(&lp->lp_refcount) == 0);
295 LASSERT(lp->lp_rtr_refcount == 0);
296 LASSERT(list_empty(&lp->lp_peer_nets));
297 LASSERT(list_empty(&lp->lp_peer_list));
298 LASSERT(list_empty(&lp->lp_dc_list));
301 lnet_ping_buffer_decref(lp->lp_data);
304 * if there are messages still on the pending queue, then make
305 * sure to queue them on the ln_msg_resend list so they can be
306 * resent at a later point if the discovery thread is still
308 * If the discovery thread has stopped, then the wakeup will be a
309 * no-op, and it is expected the lnet_shutdown_lndnets() will
310 * eventually be called, which will traverse this list and
311 * finalize the messages on the list.
312 * We can not resend them now because we're holding the cpt lock.
313 * Releasing the lock can cause an inconsistent state
315 spin_lock(&the_lnet.ln_msg_resend_lock);
316 spin_lock(&lp->lp_lock);
317 list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
318 spin_unlock(&lp->lp_lock);
319 spin_unlock(&the_lnet.ln_msg_resend_lock);
320 wake_up(&the_lnet.ln_dc_waitq);
322 LIBCFS_FREE(lp, sizeof(*lp));
326 * Detach a peer_ni from its peer_net. If this was the last peer_ni on
327 * that peer_net, detach the peer_net from the peer.
329 * Call with lnet_net_lock/EX held
332 lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
334 struct lnet_peer_table *ptable;
335 struct lnet_peer_net *lpn;
336 struct lnet_peer *lp;
339 * Belts and suspenders: gracefully handle teardown of a
340 * partially connected peer_ni.
342 lpn = lpni->lpni_peer_net;
344 list_del_init(&lpni->lpni_peer_nis);
346 * If there are no lpni's left, we detach lpn from
347 * lp_peer_nets, so it cannot be found anymore.
349 if (list_empty(&lpn->lpn_peer_nis))
350 list_del_init(&lpn->lpn_peer_nets);
352 /* Update peer NID count. */
357 * If there are no more peer nets, make the peer unfindable
358 * via the peer_tables.
360 * Otherwise, if the peer is DISCOVERED, tell discovery to
361 * take another look at it. This is a no-op if discovery for
362 * this peer did the detaching.
364 if (list_empty(&lp->lp_peer_nets)) {
365 list_del_init(&lp->lp_peer_list);
366 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
368 } else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
369 /* Discovery isn't running, nothing to do here. */
370 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
371 lnet_peer_queue_for_discovery(lp);
372 wake_up(&the_lnet.ln_dc_waitq);
374 CDEBUG(D_NET, "peer %s NID %s\n",
375 libcfs_nid2str(lp->lp_primary_nid),
376 libcfs_nid2str(lpni->lpni_nid));
379 /* called with lnet_net_lock LNET_LOCK_EX held */
381 lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni, bool force)
383 struct lnet_peer_table *ptable = NULL;
385 /* don't remove a peer_ni if it's also a gateway */
386 if (lnet_isrouter(lpni) && !force) {
387 CERROR("Peer NI %s is a gateway. Can not delete it\n",
388 libcfs_nid2str(lpni->lpni_nid));
392 lnet_peer_remove_from_remote_list(lpni);
394 /* remove peer ni from the hash list. */
395 list_del_init(&lpni->lpni_hashlist);
398 * indicate the peer is being deleted so the monitor thread can
399 * remove it from the recovery queue.
401 spin_lock(&lpni->lpni_lock);
402 lpni->lpni_state |= LNET_PEER_NI_DELETING;
403 spin_unlock(&lpni->lpni_lock);
405 /* decrement the ref count on the peer table */
406 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
409 * The peer_ni can no longer be found with a lookup. But there
410 * can be current users, so keep track of it on the zombie
411 * list until the reference count has gone to zero.
413 * The last reference may be lost in a place where the
414 * lnet_net_lock locks only a single cpt, and that cpt may not
415 * be lpni->lpni_cpt. So the zombie list of lnet_peer_table
418 spin_lock(&ptable->pt_zombie_lock);
419 list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
420 ptable->pt_zombies++;
421 spin_unlock(&ptable->pt_zombie_lock);
423 /* no need to keep this peer_ni on the hierarchy anymore */
424 lnet_peer_detach_peer_ni_locked(lpni);
426 /* remove hashlist reference on peer_ni */
427 lnet_peer_ni_decref_locked(lpni);
432 void lnet_peer_uninit(void)
434 struct lnet_peer_ni *lpni, *tmp;
436 lnet_net_lock(LNET_LOCK_EX);
438 /* remove all peer_nis from the remote peer and the hash list */
439 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
440 lpni_on_remote_peer_ni_list)
441 lnet_peer_ni_del_locked(lpni, false);
443 lnet_peer_tables_destroy();
445 lnet_net_unlock(LNET_LOCK_EX);
449 lnet_peer_del_locked(struct lnet_peer *peer)
451 struct lnet_peer_ni *lpni = NULL, *lpni2;
454 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(peer->lp_primary_nid));
456 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
457 while (lpni != NULL) {
458 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
459 rc = lnet_peer_ni_del_locked(lpni, false);
469 lnet_peer_del(struct lnet_peer *peer)
471 lnet_net_lock(LNET_LOCK_EX);
472 lnet_peer_del_locked(peer);
473 lnet_net_unlock(LNET_LOCK_EX);
479 * Delete a NID from a peer. Call with ln_api_mutex held.
482 * -EPERM: Non-DLC deletion from DLC-configured peer.
483 * -ENOENT: No lnet_peer_ni corresponding to the nid.
484 * -ECHILD: The lnet_peer_ni isn't connected to the peer.
485 * -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
488 lnet_peer_del_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
490 struct lnet_peer_ni *lpni;
491 lnet_nid_t primary_nid = lp->lp_primary_nid;
493 bool force = (flags & LNET_PEER_RTR_NI_FORCE_DEL) ? true : false;
495 if (!(flags & LNET_PEER_CONFIGURED)) {
496 if (lp->lp_state & LNET_PEER_CONFIGURED) {
501 lpni = lnet_find_peer_ni_locked(nid);
506 lnet_peer_ni_decref_locked(lpni);
507 if (lp != lpni->lpni_peer_net->lpn_peer) {
513 * This function only allows deletion of the primary NID if it
516 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && !force) {
521 lnet_net_lock(LNET_LOCK_EX);
523 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && force) {
524 struct lnet_peer_ni *lpni2;
525 /* assign the next peer_ni to be the primary */
526 lpni2 = lnet_get_next_peer_ni_locked(lp, NULL, lpni);
528 lp->lp_primary_nid = lpni->lpni_nid;
530 rc = lnet_peer_ni_del_locked(lpni, force);
532 lnet_net_unlock(LNET_LOCK_EX);
535 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
536 libcfs_nid2str(primary_nid), libcfs_nid2str(nid), flags, rc);
542 lnet_peer_table_cleanup_locked(struct lnet_net *net,
543 struct lnet_peer_table *ptable)
546 struct lnet_peer_ni *next;
547 struct lnet_peer_ni *lpni;
548 struct lnet_peer *peer;
550 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
551 list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
553 if (net != NULL && net != lpni->lpni_net)
556 peer = lpni->lpni_peer_net->lpn_peer;
557 if (peer->lp_primary_nid != lpni->lpni_nid) {
558 lnet_peer_ni_del_locked(lpni, false);
562 * Removing the primary NID implies removing
563 * the entire peer. Advance next beyond any
564 * peer_ni that belongs to the same peer.
566 list_for_each_entry_from(next, &ptable->pt_hash[i],
568 if (next->lpni_peer_net->lpn_peer != peer)
571 lnet_peer_del_locked(peer);
577 lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
581 spin_lock(&ptable->pt_zombie_lock);
582 while (ptable->pt_zombies) {
583 spin_unlock(&ptable->pt_zombie_lock);
585 if (is_power_of_2(i)) {
587 "Waiting for %d zombies on peer table\n",
590 set_current_state(TASK_UNINTERRUPTIBLE);
591 schedule_timeout(cfs_time_seconds(1) >> 1);
592 spin_lock(&ptable->pt_zombie_lock);
594 spin_unlock(&ptable->pt_zombie_lock);
598 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
599 struct lnet_peer_table *ptable)
601 struct lnet_peer_ni *lp;
602 struct lnet_peer_ni *tmp;
606 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
607 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
609 if (net != lp->lpni_net)
612 if (!lnet_isrouter(lp))
615 gw_nid = lp->lpni_peer_net->lpn_peer->lp_primary_nid;
617 lnet_net_unlock(LNET_LOCK_EX);
618 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), gw_nid);
619 lnet_net_lock(LNET_LOCK_EX);
625 lnet_peer_tables_cleanup(struct lnet_net *net)
628 struct lnet_peer_table *ptable;
630 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
631 /* If just deleting the peers for a NI, get rid of any routes these
632 * peers are gateways for. */
633 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
634 lnet_net_lock(LNET_LOCK_EX);
635 lnet_peer_table_del_rtrs_locked(net, ptable);
636 lnet_net_unlock(LNET_LOCK_EX);
639 /* Start the cleanup process */
640 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
641 lnet_net_lock(LNET_LOCK_EX);
642 lnet_peer_table_cleanup_locked(net, ptable);
643 lnet_net_unlock(LNET_LOCK_EX);
646 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
647 lnet_peer_ni_finalize_wait(ptable);
650 static struct lnet_peer_ni *
651 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
653 struct list_head *peers;
654 struct lnet_peer_ni *lp;
656 if (the_lnet.ln_state != LNET_STATE_RUNNING)
659 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
660 list_for_each_entry(lp, peers, lpni_hashlist) {
661 if (lp->lpni_nid == nid) {
662 lnet_peer_ni_addref_locked(lp);
670 struct lnet_peer_ni *
671 lnet_find_peer_ni_locked(lnet_nid_t nid)
673 struct lnet_peer_ni *lpni;
674 struct lnet_peer_table *ptable;
677 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
679 ptable = the_lnet.ln_peer_tables[cpt];
680 lpni = lnet_get_peer_ni_locked(ptable, nid);
685 struct lnet_peer_ni *
686 lnet_peer_get_ni_locked(struct lnet_peer *lp, lnet_nid_t nid)
688 struct lnet_peer_net *lpn;
689 struct lnet_peer_ni *lpni;
691 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
695 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
696 if (lpni->lpni_nid == nid)
704 lnet_find_peer(lnet_nid_t nid)
706 struct lnet_peer_ni *lpni;
707 struct lnet_peer *lp = NULL;
710 cpt = lnet_net_lock_current();
711 lpni = lnet_find_peer_ni_locked(nid);
713 lp = lpni->lpni_peer_net->lpn_peer;
714 lnet_peer_addref_locked(lp);
715 lnet_peer_ni_decref_locked(lpni);
717 lnet_net_unlock(cpt);
722 struct lnet_peer_net *
723 lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
725 struct lnet_peer_net *net;
728 /* no net id provided return the first net */
729 net = list_first_entry_or_null(&lp->lp_peer_nets,
730 struct lnet_peer_net,
736 /* find the net after the one provided */
737 list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
738 if (net->lpn_net_id == prev_lpn_id) {
740 * if we reached the end of the list loop to the
743 if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
744 return list_first_entry_or_null(&lp->lp_peer_nets,
745 struct lnet_peer_net,
748 return list_next_entry(net, lpn_peer_nets);
755 struct lnet_peer_ni *
756 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
757 struct lnet_peer_net *peer_net,
758 struct lnet_peer_ni *prev)
760 struct lnet_peer_ni *lpni;
761 struct lnet_peer_net *net = peer_net;
765 if (list_empty(&peer->lp_peer_nets))
768 net = list_entry(peer->lp_peer_nets.next,
769 struct lnet_peer_net,
772 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
778 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
780 * if you reached the end of the peer ni list and the peer
781 * net is specified then there are no more peer nis in that
788 * we reached the end of this net ni list. move to the
791 if (prev->lpni_peer_net->lpn_peer_nets.next ==
793 /* no more nets and no more NIs. */
796 /* get the next net */
797 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
798 struct lnet_peer_net,
800 /* get the ni on it */
801 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
807 /* there are more nis left */
808 lpni = list_entry(prev->lpni_peer_nis.next,
809 struct lnet_peer_ni, lpni_peer_nis);
814 /* Call with the ln_api_mutex held */
815 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
817 struct lnet_process_id id;
818 struct lnet_peer_table *ptable;
819 struct lnet_peer *lp;
828 if (the_lnet.ln_state != LNET_STATE_RUNNING)
831 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
834 * Count the number of peers, and return E2BIG if the buffer
835 * is too small. We'll also return the desired size.
838 for (cpt = 0; cpt < lncpt; cpt++) {
839 ptable = the_lnet.ln_peer_tables[cpt];
840 count += ptable->pt_peers;
842 size = count * sizeof(*ids);
847 * Walk the peer lists and copy out the primary nids.
848 * This is safe because the peer lists are only modified
849 * while the ln_api_mutex is held. So we don't need to
850 * hold the lnet_net_lock as well, and can therefore
851 * directly call copy_to_user().
854 memset(&id, 0, sizeof(id));
855 id.pid = LNET_PID_LUSTRE;
857 for (cpt = 0; cpt < lncpt; cpt++) {
858 ptable = the_lnet.ln_peer_tables[cpt];
859 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
862 id.nid = lp->lp_primary_nid;
863 if (copy_to_user(&ids[i], &id, sizeof(id)))
876 * Start pushes to peers that need to be updated for a configuration
877 * change on this node.
880 lnet_push_update_to_peers(int force)
882 struct lnet_peer_table *ptable;
883 struct lnet_peer *lp;
887 lnet_net_lock(LNET_LOCK_EX);
888 if (lnet_peer_discovery_disabled)
890 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
891 for (cpt = 0; cpt < lncpt; cpt++) {
892 ptable = the_lnet.ln_peer_tables[cpt];
893 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
895 spin_lock(&lp->lp_lock);
896 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
897 lp->lp_state |= LNET_PEER_FORCE_PUSH;
898 spin_unlock(&lp->lp_lock);
900 if (lnet_peer_needs_push(lp))
901 lnet_peer_queue_for_discovery(lp);
904 lnet_net_unlock(LNET_LOCK_EX);
905 wake_up(&the_lnet.ln_dc_waitq);
909 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
910 * this is a preferred point-to-point path. Call with lnet_net_lock in
914 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
918 if (lpni->lpni_pref_nnids == 0)
920 if (lpni->lpni_pref_nnids == 1)
921 return lpni->lpni_pref.nid == nid;
922 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
923 if (lpni->lpni_pref.nids[i] == nid)
930 * Set a single ni as preferred, provided no preferred ni is already
931 * defined. Only to be used for non-multi-rail peer_ni.
934 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
938 spin_lock(&lpni->lpni_lock);
939 if (nid == LNET_NID_ANY) {
941 } else if (lpni->lpni_pref_nnids > 0) {
943 } else if (lpni->lpni_pref_nnids == 0) {
944 lpni->lpni_pref.nid = nid;
945 lpni->lpni_pref_nnids = 1;
946 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
948 spin_unlock(&lpni->lpni_lock);
950 CDEBUG(D_NET, "peer %s nid %s: %d\n",
951 libcfs_nid2str(lpni->lpni_nid), libcfs_nid2str(nid), rc);
956 * Clear the preferred NID from a non-multi-rail peer_ni, provided
957 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
960 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
964 spin_lock(&lpni->lpni_lock);
965 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
966 lpni->lpni_pref_nnids = 0;
967 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
968 } else if (lpni->lpni_pref_nnids == 0) {
973 spin_unlock(&lpni->lpni_lock);
975 CDEBUG(D_NET, "peer %s: %d\n",
976 libcfs_nid2str(lpni->lpni_nid), rc);
981 * Clear the preferred NIDs from a non-multi-rail peer.
984 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
986 struct lnet_peer_ni *lpni = NULL;
988 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
989 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
993 lnet_peer_add_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 (nid == LNET_NID_ANY) {
1007 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
1012 /* A non-MR node may have only one preferred NI per peer_ni */
1013 if (lpni->lpni_pref_nnids > 0) {
1014 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1020 if (lpni->lpni_pref_nnids != 0) {
1021 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1022 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1027 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
1028 if (lpni->lpni_pref.nids[i] == nid) {
1029 LIBCFS_FREE(nids, size);
1033 nids[i] = lpni->lpni_pref.nids[i];
1038 lnet_net_lock(LNET_LOCK_EX);
1039 spin_lock(&lpni->lpni_lock);
1040 if (lpni->lpni_pref_nnids == 0) {
1041 lpni->lpni_pref.nid = nid;
1043 oldnids = lpni->lpni_pref.nids;
1044 lpni->lpni_pref.nids = nids;
1046 lpni->lpni_pref_nnids++;
1047 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1048 spin_unlock(&lpni->lpni_lock);
1049 lnet_net_unlock(LNET_LOCK_EX);
1052 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1053 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
1056 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
1057 spin_lock(&lpni->lpni_lock);
1058 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1059 spin_unlock(&lpni->lpni_lock);
1061 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1062 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1067 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1069 lnet_nid_t *nids = NULL;
1070 lnet_nid_t *oldnids = NULL;
1071 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1076 if (lpni->lpni_pref_nnids == 0) {
1081 if (lpni->lpni_pref_nnids == 1) {
1082 if (lpni->lpni_pref.nid != nid) {
1086 } else if (lpni->lpni_pref_nnids == 2) {
1087 if (lpni->lpni_pref.nids[0] != nid &&
1088 lpni->lpni_pref.nids[1] != nid) {
1093 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1094 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1099 for (i = 0, j = 0; i < lpni->lpni_pref_nnids; i++) {
1100 if (lpni->lpni_pref.nids[i] != nid)
1102 nids[j++] = lpni->lpni_pref.nids[i];
1104 /* Check if we actually removed a nid. */
1105 if (j == lpni->lpni_pref_nnids) {
1106 LIBCFS_FREE(nids, size);
1112 lnet_net_lock(LNET_LOCK_EX);
1113 spin_lock(&lpni->lpni_lock);
1114 if (lpni->lpni_pref_nnids == 1) {
1115 lpni->lpni_pref.nid = LNET_NID_ANY;
1116 } else if (lpni->lpni_pref_nnids == 2) {
1117 oldnids = lpni->lpni_pref.nids;
1118 if (oldnids[0] == nid)
1119 lpni->lpni_pref.nid = oldnids[1];
1121 lpni->lpni_pref.nid = oldnids[2];
1123 oldnids = lpni->lpni_pref.nids;
1124 lpni->lpni_pref.nids = nids;
1126 lpni->lpni_pref_nnids--;
1127 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1128 spin_unlock(&lpni->lpni_lock);
1129 lnet_net_unlock(LNET_LOCK_EX);
1132 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1133 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
1136 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1137 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1142 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1144 struct lnet_peer_ni *lpni;
1145 lnet_nid_t primary_nid = nid;
1147 lpni = lnet_find_peer_ni_locked(nid);
1149 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
1150 lnet_peer_ni_decref_locked(lpni);
1157 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1158 __must_hold(&lp->lp_lock)
1160 if (lnet_peer_discovery_disabled)
1163 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1164 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1175 lnet_is_discovery_disabled(struct lnet_peer *lp)
1179 spin_lock(&lp->lp_lock);
1180 rc = lnet_is_discovery_disabled_locked(lp);
1181 spin_unlock(&lp->lp_lock);
1187 LNetPrimaryNID(lnet_nid_t nid)
1189 struct lnet_peer *lp;
1190 struct lnet_peer_ni *lpni;
1191 lnet_nid_t primary_nid = nid;
1195 cpt = lnet_net_lock_current();
1196 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1201 lp = lpni->lpni_peer_net->lpn_peer;
1203 while (!lnet_peer_is_uptodate(lp)) {
1204 rc = lnet_discover_peer_locked(lpni, cpt, true);
1207 lp = lpni->lpni_peer_net->lpn_peer;
1209 /* Only try once if discovery is disabled */
1210 if (lnet_is_discovery_disabled(lp))
1213 primary_nid = lp->lp_primary_nid;
1215 lnet_peer_ni_decref_locked(lpni);
1217 lnet_net_unlock(cpt);
1219 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1220 libcfs_nid2str(primary_nid), rc);
1223 EXPORT_SYMBOL(LNetPrimaryNID);
1225 struct lnet_peer_net *
1226 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1228 struct lnet_peer_net *peer_net;
1229 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1230 if (peer_net->lpn_net_id == net_id)
1237 * Attach a peer_ni to a peer_net and peer. This function assumes
1238 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1239 * may be attached to a different peer, in which case it will be
1240 * properly detached first. The whole operation is done atomically.
1242 * Always returns 0. This is the last function called from functions
1243 * that do return an int, so returning 0 here allows the compiler to
1247 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1248 struct lnet_peer_net *lpn,
1249 struct lnet_peer_ni *lpni,
1252 struct lnet_peer_table *ptable;
1254 /* Install the new peer_ni */
1255 lnet_net_lock(LNET_LOCK_EX);
1256 /* Add peer_ni to global peer table hash, if necessary. */
1257 if (list_empty(&lpni->lpni_hashlist)) {
1258 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1260 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1261 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1262 ptable->pt_version++;
1263 /* This is the 1st refcount on lpni. */
1264 atomic_inc(&lpni->lpni_refcount);
1267 /* Detach the peer_ni from an existing peer, if necessary. */
1268 if (lpni->lpni_peer_net) {
1269 LASSERT(lpni->lpni_peer_net != lpn);
1270 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1271 lnet_peer_detach_peer_ni_locked(lpni);
1272 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1273 lpni->lpni_peer_net = NULL;
1276 /* Add peer_ni to peer_net */
1277 lpni->lpni_peer_net = lpn;
1278 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1279 lnet_peer_net_addref_locked(lpn);
1281 /* Add peer_net to peer */
1282 if (!lpn->lpn_peer) {
1284 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1285 lnet_peer_addref_locked(lp);
1288 /* Add peer to global peer list, if necessary */
1289 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1290 if (list_empty(&lp->lp_peer_list)) {
1291 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1296 /* Update peer state */
1297 spin_lock(&lp->lp_lock);
1298 if (flags & LNET_PEER_CONFIGURED) {
1299 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1300 lp->lp_state |= LNET_PEER_CONFIGURED;
1302 if (flags & LNET_PEER_MULTI_RAIL) {
1303 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1304 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1305 lnet_peer_clr_non_mr_pref_nids(lp);
1308 spin_unlock(&lp->lp_lock);
1311 lnet_net_unlock(LNET_LOCK_EX);
1313 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1314 libcfs_nid2str(lp->lp_primary_nid),
1315 libcfs_nid2str(lpni->lpni_nid), flags);
1321 * Create a new peer, with nid as its primary nid.
1323 * Call with the lnet_api_mutex held.
1326 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1328 struct lnet_peer *lp;
1329 struct lnet_peer_net *lpn;
1330 struct lnet_peer_ni *lpni;
1333 LASSERT(nid != LNET_NID_ANY);
1336 * No need for the lnet_net_lock here, because the
1337 * lnet_api_mutex is held.
1339 lpni = lnet_find_peer_ni_locked(nid);
1341 /* A peer with this NID already exists. */
1342 lp = lpni->lpni_peer_net->lpn_peer;
1343 lnet_peer_ni_decref_locked(lpni);
1345 * This is an error if the peer was configured and the
1346 * primary NID differs or an attempt is made to change
1347 * the Multi-Rail flag. Otherwise the assumption is
1348 * that an existing peer is being modified.
1350 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1351 if (lp->lp_primary_nid != nid)
1353 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1357 /* Delete and recreate as a configured peer. */
1361 /* Create peer, peer_net, and peer_ni. */
1363 lp = lnet_peer_alloc(nid);
1366 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1369 lpni = lnet_peer_ni_alloc(nid);
1373 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1376 LIBCFS_FREE(lpn, sizeof(*lpn));
1378 LIBCFS_FREE(lp, sizeof(*lp));
1380 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1381 libcfs_nid2str(nid), flags, rc);
1386 * Add a NID to a peer. Call with ln_api_mutex held.
1389 * -EPERM: Non-DLC addition to a DLC-configured peer.
1390 * -EEXIST: The NID was configured by DLC for a different peer.
1391 * -ENOMEM: Out of memory.
1392 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1393 * non-multi-rail peer.
1396 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1398 struct lnet_peer_net *lpn;
1399 struct lnet_peer_ni *lpni;
1403 LASSERT(nid != LNET_NID_ANY);
1405 /* A configured peer can only be updated through configuration. */
1406 if (!(flags & LNET_PEER_CONFIGURED)) {
1407 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1414 * The MULTI_RAIL flag can be set but not cleared, because
1415 * that would leave the peer struct in an invalid state.
1417 if (flags & LNET_PEER_MULTI_RAIL) {
1418 spin_lock(&lp->lp_lock);
1419 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1420 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1421 lnet_peer_clr_non_mr_pref_nids(lp);
1423 spin_unlock(&lp->lp_lock);
1424 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1429 lpni = lnet_find_peer_ni_locked(nid);
1432 * A peer_ni already exists. This is only a problem if
1433 * it is not connected to this peer and was configured
1436 lnet_peer_ni_decref_locked(lpni);
1437 if (lpni->lpni_peer_net->lpn_peer == lp)
1439 if (lnet_peer_ni_is_configured(lpni)) {
1443 /* If this is the primary NID, destroy the peer. */
1444 if (lnet_peer_ni_is_primary(lpni)) {
1445 struct lnet_peer *rtr_lp =
1446 lpni->lpni_peer_net->lpn_peer;
1447 int rtr_refcount = rtr_lp->lp_rtr_refcount;
1449 * if we're trying to delete a router it means
1450 * we're moving this peer NI to a new peer so must
1451 * transfer router properties to the new peer
1453 if (rtr_refcount > 0) {
1454 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1455 lnet_rtr_transfer_to_peer(rtr_lp, lp);
1457 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1458 lpni = lnet_peer_ni_alloc(nid);
1465 lpni = lnet_peer_ni_alloc(nid);
1473 * Get the peer_net. Check that we're not adding a second
1474 * peer_ni on a peer_net of a non-multi-rail peer.
1476 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1478 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1483 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1488 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1491 /* If the peer_ni was allocated above its peer_net pointer is NULL */
1492 if (!lpni->lpni_peer_net)
1493 LIBCFS_FREE(lpni, sizeof(*lpni));
1495 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1496 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1502 * Update the primary NID of a peer, if possible.
1504 * Call with the lnet_api_mutex held.
1507 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1509 lnet_nid_t old = lp->lp_primary_nid;
1512 if (lp->lp_primary_nid == nid)
1514 rc = lnet_peer_add_nid(lp, nid, flags);
1517 lp->lp_primary_nid = nid;
1519 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1520 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1525 * lpni creation initiated due to traffic either sending or receiving.
1528 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1530 struct lnet_peer *lp;
1531 struct lnet_peer_net *lpn;
1532 struct lnet_peer_ni *lpni;
1534 * Assume peer is Multi-Rail capable and let discovery find out
1537 unsigned flags = LNET_PEER_MULTI_RAIL;
1540 if (nid == LNET_NID_ANY) {
1545 /* lnet_net_lock is not needed here because ln_api_lock is held */
1546 lpni = lnet_find_peer_ni_locked(nid);
1549 * We must have raced with another thread. Since we
1550 * know next to nothing about a peer_ni created by
1551 * traffic, we just assume everything is ok and
1554 lnet_peer_ni_decref_locked(lpni);
1558 /* Create peer, peer_net, and peer_ni. */
1560 lp = lnet_peer_alloc(nid);
1563 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1566 lpni = lnet_peer_ni_alloc(nid);
1569 if (pref != LNET_NID_ANY)
1570 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1572 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1575 LIBCFS_FREE(lpn, sizeof(*lpn));
1577 LIBCFS_FREE(lp, sizeof(*lp));
1579 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1584 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1586 * This API handles the following combinations:
1587 * Create a peer with its primary NI if only the prim_nid is provided
1588 * Add a NID to a peer identified by the prim_nid. The peer identified
1589 * by the prim_nid must already exist.
1590 * The peer being created may be non-MR.
1592 * The caller must hold ln_api_mutex. This prevents the peer from
1593 * being created/modified/deleted by a different thread.
1596 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1598 struct lnet_peer *lp = NULL;
1599 struct lnet_peer_ni *lpni;
1602 /* The prim_nid must always be specified */
1603 if (prim_nid == LNET_NID_ANY)
1606 flags = LNET_PEER_CONFIGURED;
1608 flags |= LNET_PEER_MULTI_RAIL;
1611 * If nid isn't specified, we must create a new peer with
1612 * prim_nid as its primary nid.
1614 if (nid == LNET_NID_ANY)
1615 return lnet_peer_add(prim_nid, flags);
1617 /* Look up the prim_nid, which must exist. */
1618 lpni = lnet_find_peer_ni_locked(prim_nid);
1621 lnet_peer_ni_decref_locked(lpni);
1622 lp = lpni->lpni_peer_net->lpn_peer;
1624 /* Peer must have been configured. */
1625 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1626 CDEBUG(D_NET, "peer %s was not configured\n",
1627 libcfs_nid2str(prim_nid));
1631 /* Primary NID must match */
1632 if (lp->lp_primary_nid != prim_nid) {
1633 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1634 libcfs_nid2str(prim_nid),
1635 libcfs_nid2str(lp->lp_primary_nid));
1639 /* Multi-Rail flag must match. */
1640 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1641 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1642 libcfs_nid2str(prim_nid));
1646 return lnet_peer_add_nid(lp, nid, flags);
1650 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1652 * This API handles the following combinations:
1653 * Delete a NI from a peer if both prim_nid and nid are provided.
1654 * Delete a peer if only prim_nid is provided.
1655 * Delete a peer if its primary nid is provided.
1657 * The caller must hold ln_api_mutex. This prevents the peer from
1658 * being modified/deleted by a different thread.
1661 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1663 struct lnet_peer *lp;
1664 struct lnet_peer_ni *lpni;
1667 if (prim_nid == LNET_NID_ANY)
1670 lpni = lnet_find_peer_ni_locked(prim_nid);
1673 lnet_peer_ni_decref_locked(lpni);
1674 lp = lpni->lpni_peer_net->lpn_peer;
1676 if (prim_nid != lp->lp_primary_nid) {
1677 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1678 libcfs_nid2str(prim_nid),
1679 libcfs_nid2str(lp->lp_primary_nid));
1683 lnet_net_lock(LNET_LOCK_EX);
1684 if (lp->lp_rtr_refcount > 0) {
1685 lnet_net_unlock(LNET_LOCK_EX);
1686 CERROR("%s is a router. Can not be deleted\n",
1687 libcfs_nid2str(prim_nid));
1690 lnet_net_unlock(LNET_LOCK_EX);
1692 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1693 return lnet_peer_del(lp);
1695 flags = LNET_PEER_CONFIGURED;
1696 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1697 flags |= LNET_PEER_MULTI_RAIL;
1699 return lnet_peer_del_nid(lp, nid, flags);
1703 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
1705 struct lnet_peer_table *ptable;
1706 struct lnet_peer_net *lpn;
1708 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1710 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
1711 LASSERT(list_empty(&lpni->lpni_txq));
1712 LASSERT(lpni->lpni_txqnob == 0);
1713 LASSERT(list_empty(&lpni->lpni_peer_nis));
1714 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1716 lpn = lpni->lpni_peer_net;
1717 lpni->lpni_peer_net = NULL;
1718 lpni->lpni_net = NULL;
1720 /* remove the peer ni from the zombie list */
1721 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1722 spin_lock(&ptable->pt_zombie_lock);
1723 list_del_init(&lpni->lpni_hashlist);
1724 ptable->pt_zombies--;
1725 spin_unlock(&ptable->pt_zombie_lock);
1727 if (lpni->lpni_pref_nnids > 1) {
1728 LIBCFS_FREE(lpni->lpni_pref.nids,
1729 sizeof(*lpni->lpni_pref.nids) * lpni->lpni_pref_nnids);
1731 LIBCFS_FREE(lpni, sizeof(*lpni));
1733 lnet_peer_net_decref_locked(lpn);
1736 struct lnet_peer_ni *
1737 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1739 struct lnet_peer_ni *lpni = NULL;
1742 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1743 return ERR_PTR(-ESHUTDOWN);
1746 * find if a peer_ni already exists.
1747 * If so then just return that.
1749 lpni = lnet_find_peer_ni_locked(nid);
1753 lnet_net_unlock(cpt);
1755 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1758 goto out_net_relock;
1761 lpni = lnet_find_peer_ni_locked(nid);
1771 * Get a peer_ni for the given nid, create it if necessary. Takes a
1772 * hold on the peer_ni.
1774 struct lnet_peer_ni *
1775 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1777 struct lnet_peer_ni *lpni = NULL;
1780 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1781 return ERR_PTR(-ESHUTDOWN);
1784 * find if a peer_ni already exists.
1785 * If so then just return that.
1787 lpni = lnet_find_peer_ni_locked(nid);
1793 * use the lnet_api_mutex to serialize the creation of the peer_ni
1794 * and the creation/deletion of the local ni/net. When a local ni is
1795 * created, if there exists a set of peer_nis on that network,
1796 * they need to be traversed and updated. When a local NI is
1797 * deleted, which could result in a network being deleted, then
1798 * all peer nis on that network need to be removed as well.
1800 * Creation through traffic should also be serialized with
1801 * creation through DLC.
1803 lnet_net_unlock(cpt);
1804 mutex_lock(&the_lnet.ln_api_mutex);
1806 * Shutdown is only set under the ln_api_lock, so a single
1807 * check here is sufficent.
1809 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1810 lpni = ERR_PTR(-ESHUTDOWN);
1811 goto out_mutex_unlock;
1814 rc = lnet_peer_ni_traffic_add(nid, pref);
1817 goto out_mutex_unlock;
1820 lpni = lnet_find_peer_ni_locked(nid);
1824 mutex_unlock(&the_lnet.ln_api_mutex);
1827 /* Lock has been dropped, check again for shutdown. */
1828 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1830 lnet_peer_ni_decref_locked(lpni);
1831 lpni = ERR_PTR(-ESHUTDOWN);
1838 lnet_peer_gw_discovery(struct lnet_peer *lp)
1842 spin_lock(&lp->lp_lock);
1843 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
1845 spin_unlock(&lp->lp_lock);
1851 lnet_peer_is_uptodate(struct lnet_peer *lp)
1855 spin_lock(&lp->lp_lock);
1856 rc = lnet_peer_is_uptodate_locked(lp);
1857 spin_unlock(&lp->lp_lock);
1862 * Is a peer uptodate from the point of view of discovery?
1864 * If it is currently being processed, obviously not.
1865 * A forced Ping or Push is also handled by the discovery thread.
1867 * Otherwise look at whether the peer needs rediscovering.
1870 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
1871 __must_hold(&lp->lp_lock)
1875 if (lp->lp_state & (LNET_PEER_DISCOVERING |
1876 LNET_PEER_FORCE_PING |
1877 LNET_PEER_FORCE_PUSH)) {
1879 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
1881 } else if (lnet_peer_needs_push(lp)) {
1883 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
1884 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
1896 * Queue a peer for the attention of the discovery thread. Call with
1897 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
1898 * -EALREADY if the peer was already queued.
1900 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
1904 spin_lock(&lp->lp_lock);
1905 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
1906 lp->lp_state |= LNET_PEER_DISCOVERING;
1907 spin_unlock(&lp->lp_lock);
1908 if (list_empty(&lp->lp_dc_list)) {
1909 lnet_peer_addref_locked(lp);
1910 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
1911 wake_up(&the_lnet.ln_dc_waitq);
1917 CDEBUG(D_NET, "Queue peer %s: %d\n",
1918 libcfs_nid2str(lp->lp_primary_nid), rc);
1924 * Discovery of a peer is complete. Wake all waiters on the peer.
1925 * Call with lnet_net_lock/EX held.
1927 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
1929 struct lnet_msg *msg, *tmp;
1931 struct list_head pending_msgs;
1933 INIT_LIST_HEAD(&pending_msgs);
1935 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
1936 libcfs_nid2str(lp->lp_primary_nid));
1938 list_del_init(&lp->lp_dc_list);
1939 spin_lock(&lp->lp_lock);
1940 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
1941 spin_unlock(&lp->lp_lock);
1942 wake_up_all(&lp->lp_dc_waitq);
1944 if (lp->lp_rtr_refcount > 0)
1945 lnet_router_discovery_complete(lp);
1947 lnet_net_unlock(LNET_LOCK_EX);
1949 /* iterate through all pending messages and send them again */
1950 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
1951 list_del_init(&msg->msg_list);
1952 if (lp->lp_dc_error) {
1953 lnet_finalize(msg, lp->lp_dc_error);
1957 CDEBUG(D_NET, "sending pending message %s to target %s\n",
1958 lnet_msgtyp2str(msg->msg_type),
1959 libcfs_id2str(msg->msg_target));
1960 rc = lnet_send(msg->msg_src_nid_param, msg,
1961 msg->msg_rtr_nid_param);
1963 CNETERR("Error sending %s to %s: %d\n",
1964 lnet_msgtyp2str(msg->msg_type),
1965 libcfs_id2str(msg->msg_target), rc);
1966 lnet_finalize(msg, rc);
1969 lnet_net_lock(LNET_LOCK_EX);
1970 lnet_peer_decref_locked(lp);
1974 * Handle inbound push.
1975 * Like any event handler, called with lnet_res_lock/CPT held.
1977 void lnet_peer_push_event(struct lnet_event *ev)
1979 struct lnet_ping_buffer *pbuf = ev->md.user_ptr;
1980 struct lnet_peer *lp;
1982 /* lnet_find_peer() adds a refcount */
1983 lp = lnet_find_peer(ev->source.nid);
1985 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
1986 libcfs_nid2str(ev->initiator.nid),
1987 libcfs_nid2str(ev->source.nid));
1991 /* Ensure peer state remains consistent while we modify it. */
1992 spin_lock(&lp->lp_lock);
1995 * If some kind of error happened the contents of the message
1996 * cannot be used. Clear the NIDS_UPTODATE and set the
1997 * FORCE_PING flag to trigger a ping.
2000 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2001 lp->lp_state |= LNET_PEER_FORCE_PING;
2002 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
2004 libcfs_nid2str(lp->lp_primary_nid),
2005 libcfs_nid2str(ev->source.nid));
2010 * A push with invalid or corrupted info. Clear the UPTODATE
2011 * flag to trigger a ping.
2013 if (lnet_ping_info_validate(&pbuf->pb_info)) {
2014 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2015 lp->lp_state |= LNET_PEER_FORCE_PING;
2016 CDEBUG(D_NET, "Corrupted Push from %s\n",
2017 libcfs_nid2str(lp->lp_primary_nid));
2022 * Make sure we'll allocate the correct size ping buffer when
2025 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2026 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2029 * A non-Multi-Rail peer is not supposed to be capable of
2032 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2033 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2034 libcfs_nid2str(lp->lp_primary_nid));
2039 * Check the MULTIRAIL flag. Complain if the peer was DLC
2040 * configured without it.
2042 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
2043 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2044 CERROR("Push says %s is Multi-Rail, DLC says not\n",
2045 libcfs_nid2str(lp->lp_primary_nid));
2047 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2048 lnet_peer_clr_non_mr_pref_nids(lp);
2053 * The peer may have discovery disabled at its end. Set
2054 * NO_DISCOVERY as appropriate.
2056 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2057 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2058 libcfs_nid2str(lp->lp_primary_nid));
2059 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2060 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2061 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2062 libcfs_nid2str(lp->lp_primary_nid));
2063 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2067 * Check for truncation of the Put message. Clear the
2068 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2069 * and tell discovery to allocate a bigger buffer.
2071 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2072 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2073 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2074 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2075 lp->lp_state |= LNET_PEER_FORCE_PING;
2076 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2077 libcfs_nid2str(lp->lp_primary_nid),
2078 pbuf->pb_info.pi_nnis);
2082 /* always assume new data */
2083 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2084 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2087 * If there is data present that hasn't been processed yet,
2088 * we'll replace it if the Put contained newer data and it
2089 * fits. We're racing with a Ping or earlier Push in this
2092 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2093 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2094 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2095 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2096 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2097 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2098 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2099 libcfs_nid2str(lp->lp_primary_nid),
2100 LNET_PING_BUFFER_SEQNO(pbuf),
2101 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2107 * Allocate a buffer to copy the data. On a failure we drop
2108 * the Push and set FORCE_PING to force the discovery
2109 * thread to fix the problem by pinging the peer.
2111 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2113 lp->lp_state |= LNET_PEER_FORCE_PING;
2114 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2115 libcfs_nid2str(lp->lp_primary_nid),
2116 LNET_PING_BUFFER_SEQNO(pbuf));
2121 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2122 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2123 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2124 CDEBUG(D_NET, "Received Push %s %u\n",
2125 libcfs_nid2str(lp->lp_primary_nid),
2126 LNET_PING_BUFFER_SEQNO(pbuf));
2130 * Queue the peer for discovery if not done, force it on the request
2131 * queue and wake the discovery thread if the peer was already queued,
2132 * because its status changed.
2134 spin_unlock(&lp->lp_lock);
2135 lnet_net_lock(LNET_LOCK_EX);
2136 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2137 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2138 wake_up(&the_lnet.ln_dc_waitq);
2140 /* Drop refcount from lookup */
2141 lnet_peer_decref_locked(lp);
2142 lnet_net_unlock(LNET_LOCK_EX);
2146 * Clear the discovery error state, unless we're already discovering
2147 * this peer, in which case the error is current.
2149 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2151 spin_lock(&lp->lp_lock);
2152 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2153 lp->lp_dc_error = 0;
2154 spin_unlock(&lp->lp_lock);
2158 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2159 * dropped/retaken within this function. An lnet_peer_ni is passed in
2160 * because discovery could tear down an lnet_peer.
2163 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2166 struct lnet_peer *lp;
2171 lnet_net_unlock(cpt);
2172 lnet_net_lock(LNET_LOCK_EX);
2173 lp = lpni->lpni_peer_net->lpn_peer;
2174 lnet_peer_clear_discovery_error(lp);
2177 * We're willing to be interrupted. The lpni can become a
2178 * zombie if we race with DLC, so we must check for that.
2181 /* Keep lp alive when the lnet_net_lock is unlocked */
2182 lnet_peer_addref_locked(lp);
2183 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2184 if (signal_pending(current))
2186 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2189 * Don't repeat discovery if discovery is disabled. This is
2190 * done to ensure we can use discovery as a standard ping as
2191 * well for backwards compatibility with routers which do not
2192 * have discovery or have discovery disabled
2194 if (lnet_is_discovery_disabled(lp) && count > 0)
2196 if (lp->lp_dc_error)
2198 if (lnet_peer_is_uptodate(lp))
2200 lnet_peer_queue_for_discovery(lp);
2202 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2205 * If caller requested a non-blocking operation then
2206 * return immediately. Once discovery is complete any
2207 * pending messages that were stopped due to discovery
2208 * will be transmitted.
2213 lnet_net_unlock(LNET_LOCK_EX);
2215 finish_wait(&lp->lp_dc_waitq, &wait);
2216 lnet_net_lock(LNET_LOCK_EX);
2217 lnet_peer_decref_locked(lp);
2218 /* Peer may have changed */
2219 lp = lpni->lpni_peer_net->lpn_peer;
2221 finish_wait(&lp->lp_dc_waitq, &wait);
2223 lnet_net_unlock(LNET_LOCK_EX);
2225 lnet_peer_decref_locked(lp);
2227 * The peer may have changed, so re-check and rediscover if that turns
2228 * out to have been the case. The reference count on lp ensured that
2229 * even if it was unlinked from lpni the memory could not be recycled.
2230 * Thus the check below is sufficient to determine whether the peer
2231 * changed. If the peer changed, then lp must not be dereferenced.
2233 if (lp != lpni->lpni_peer_net->lpn_peer)
2236 if (signal_pending(current))
2238 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2240 else if (lp->lp_dc_error)
2241 rc = lp->lp_dc_error;
2243 CDEBUG(D_NET, "non-blocking discovery\n");
2244 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2247 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2248 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2249 libcfs_nid2str(lpni->lpni_nid), rc,
2250 (!block) ? "pending discovery" : "discovery complete");
2255 /* Handle an incoming ack for a push. */
2257 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2259 struct lnet_ping_buffer *pbuf;
2261 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2262 spin_lock(&lp->lp_lock);
2263 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2264 lp->lp_push_error = ev->status;
2266 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2268 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2269 spin_unlock(&lp->lp_lock);
2271 CDEBUG(D_NET, "peer %s ev->status %d\n",
2272 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2275 /* Handle a Reply message. This is the reply to a Ping message. */
2277 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2279 struct lnet_ping_buffer *pbuf;
2282 spin_lock(&lp->lp_lock);
2285 * If some kind of error happened the contents of message
2286 * cannot be used. Set PING_FAILED to trigger a retry.
2289 lp->lp_state |= LNET_PEER_PING_FAILED;
2290 lp->lp_ping_error = ev->status;
2291 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2293 libcfs_nid2str(lp->lp_primary_nid),
2294 libcfs_nid2str(ev->source.nid));
2298 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2299 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2300 lnet_swap_pinginfo(pbuf);
2303 * A reply with invalid or corrupted info. Set PING_FAILED to
2306 rc = lnet_ping_info_validate(&pbuf->pb_info);
2308 lp->lp_state |= LNET_PEER_PING_FAILED;
2309 lp->lp_ping_error = 0;
2310 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2311 libcfs_nid2str(lp->lp_primary_nid), rc);
2317 * Only enable the multi-rail feature on the peer if both sides of
2318 * the connection have discovery on
2320 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2321 CDEBUG(D_NET, "Peer %s has Multi-Rail feature enabled\n",
2322 libcfs_nid2str(lp->lp_primary_nid));
2323 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2325 CDEBUG(D_NET, "Peer %s has Multi-Rail feature disabled\n",
2326 libcfs_nid2str(lp->lp_primary_nid));
2327 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2331 * The peer may have discovery disabled at its end. Set
2332 * NO_DISCOVERY as appropriate.
2334 if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) &&
2335 !lnet_peer_discovery_disabled) {
2336 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2337 libcfs_nid2str(lp->lp_primary_nid));
2338 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2340 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2341 libcfs_nid2str(lp->lp_primary_nid));
2342 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2346 * Update the MULTI_RAIL flag based on the reply. If the peer
2347 * was configured with DLC then the setting should match what
2350 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2351 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2352 /* Everything's fine */
2353 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2354 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2355 libcfs_nid2str(lp->lp_primary_nid));
2358 * if discovery is disabled then we don't want to
2359 * update the state of the peer. All we'll do is
2360 * update the peer_nis which were reported back in
2364 if (!lnet_is_discovery_disabled_locked(lp)) {
2365 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2366 lnet_peer_clr_non_mr_pref_nids(lp);
2369 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2370 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2371 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2372 libcfs_nid2str(lp->lp_primary_nid));
2374 CERROR("Multi-Rail state vanished from %s\n",
2375 libcfs_nid2str(lp->lp_primary_nid));
2376 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2381 * Make sure we'll allocate the correct size ping buffer when
2384 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2385 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2388 * Check for truncation of the Reply. Clear PING_SENT and set
2389 * PING_FAILED to trigger a retry.
2391 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2392 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2393 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2394 lp->lp_state |= LNET_PEER_PING_FAILED;
2395 lp->lp_ping_error = 0;
2396 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2397 libcfs_nid2str(lp->lp_primary_nid),
2398 pbuf->pb_info.pi_nnis);
2403 * Check the sequence numbers in the reply. These are only
2404 * available if the reply came from a Multi-Rail peer.
2406 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2407 pbuf->pb_info.pi_nnis > 1 &&
2408 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2409 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2410 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2411 libcfs_nid2str(lp->lp_primary_nid),
2412 LNET_PING_BUFFER_SEQNO(pbuf),
2415 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2418 /* We're happy with the state of the data in the buffer. */
2419 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2420 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno, lp->lp_state);
2421 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2422 lnet_ping_buffer_decref(lp->lp_data);
2424 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2425 lnet_ping_buffer_addref(pbuf);
2428 lp->lp_state &= ~LNET_PEER_PING_SENT;
2429 spin_unlock(&lp->lp_lock);
2431 lnet_net_lock(LNET_LOCK_EX);
2433 * If this peer is a gateway, call the routing callback to
2434 * handle the ping reply
2436 if (lp->lp_rtr_refcount > 0)
2437 lnet_router_discovery_ping_reply(lp);
2438 lnet_net_unlock(LNET_LOCK_EX);
2442 * Send event handling. Only matters for error cases, where we clean
2443 * up state on the peer and peer_ni that would otherwise be updated in
2444 * the REPLY event handler for a successful Ping, and the ACK event
2445 * handler for a successful Push.
2448 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2455 spin_lock(&lp->lp_lock);
2456 if (ev->msg_type == LNET_MSG_GET) {
2457 lp->lp_state &= ~LNET_PEER_PING_SENT;
2458 lp->lp_state |= LNET_PEER_PING_FAILED;
2459 lp->lp_ping_error = ev->status;
2460 } else { /* ev->msg_type == LNET_MSG_PUT */
2461 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2462 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2463 lp->lp_push_error = ev->status;
2465 spin_unlock(&lp->lp_lock);
2466 rc = LNET_REDISCOVER_PEER;
2468 CDEBUG(D_NET, "%s Send to %s: %d\n",
2469 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2470 libcfs_nid2str(ev->target.nid), rc);
2475 * Unlink event handling. This event is only seen if a call to
2476 * LNetMDUnlink() caused the event to be unlinked. If this call was
2477 * made after the event was set up in LNetGet() or LNetPut() then we
2478 * assume the Ping or Push timed out.
2481 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2483 spin_lock(&lp->lp_lock);
2484 /* We've passed through LNetGet() */
2485 if (lp->lp_state & LNET_PEER_PING_SENT) {
2486 lp->lp_state &= ~LNET_PEER_PING_SENT;
2487 lp->lp_state |= LNET_PEER_PING_FAILED;
2488 lp->lp_ping_error = -ETIMEDOUT;
2489 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2490 libcfs_nid2str(lp->lp_primary_nid));
2492 /* We've passed through LNetPut() */
2493 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2494 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2495 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2496 lp->lp_push_error = -ETIMEDOUT;
2497 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2498 libcfs_nid2str(lp->lp_primary_nid));
2500 spin_unlock(&lp->lp_lock);
2504 * Event handler for the discovery EQ.
2506 * Called with lnet_res_lock(cpt) held. The cpt is the
2507 * lnet_cpt_of_cookie() of the md handle cookie.
2509 static void lnet_discovery_event_handler(struct lnet_event *event)
2511 struct lnet_peer *lp = event->md.user_ptr;
2512 struct lnet_ping_buffer *pbuf;
2515 /* discovery needs to take another look */
2516 rc = LNET_REDISCOVER_PEER;
2518 CDEBUG(D_NET, "Received event: %d\n", event->type);
2520 switch (event->type) {
2521 case LNET_EVENT_ACK:
2522 lnet_discovery_event_ack(lp, event);
2524 case LNET_EVENT_REPLY:
2525 lnet_discovery_event_reply(lp, event);
2527 case LNET_EVENT_SEND:
2528 /* Only send failure triggers a retry. */
2529 rc = lnet_discovery_event_send(lp, event);
2531 case LNET_EVENT_UNLINK:
2532 /* LNetMDUnlink() was called */
2533 lnet_discovery_event_unlink(lp, event);
2536 /* Invalid events. */
2539 lnet_net_lock(LNET_LOCK_EX);
2540 if (event->unlinked) {
2541 pbuf = LNET_PING_INFO_TO_BUFFER(event->md.start);
2542 lnet_ping_buffer_decref(pbuf);
2543 lnet_peer_decref_locked(lp);
2546 /* put peer back at end of request queue, if discovery not already
2548 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2549 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2550 wake_up(&the_lnet.ln_dc_waitq);
2552 lnet_net_unlock(LNET_LOCK_EX);
2556 * Build a peer from incoming data.
2558 * The NIDs in the incoming data are supposed to be structured as follows:
2561 * - other NIDs in same net
2562 * - NIDs in second net
2563 * - NIDs in third net
2565 * This due to the way the list of NIDs in the data is created.
2567 * Note that this function will mark the peer uptodate unless an
2568 * ENOMEM is encontered. All other errors are due to a conflict
2569 * between the DLC configuration and what discovery sees. We treat DLC
2570 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2571 * peer from becoming stuck in discovery.
2573 static int lnet_peer_merge_data(struct lnet_peer *lp,
2574 struct lnet_ping_buffer *pbuf)
2576 struct lnet_peer_ni *lpni;
2577 lnet_nid_t *curnis = NULL;
2578 struct lnet_ni_status *addnis = NULL;
2579 lnet_nid_t *delnis = NULL;
2589 flags = LNET_PEER_DISCOVERED;
2590 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2591 flags |= LNET_PEER_MULTI_RAIL;
2594 * Cache the routing feature for the peer; whether it is enabled
2595 * for disabled as reported by the remote peer.
2597 spin_lock(&lp->lp_lock);
2598 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
2599 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
2601 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
2602 spin_unlock(&lp->lp_lock);
2604 nnis = MAX(lp->lp_nnis, pbuf->pb_info.pi_nnis);
2605 LIBCFS_ALLOC(curnis, nnis * sizeof(*curnis));
2606 LIBCFS_ALLOC(addnis, nnis * sizeof(*addnis));
2607 LIBCFS_ALLOC(delnis, nnis * sizeof(*delnis));
2608 if (!curnis || !addnis || !delnis) {
2616 /* Construct the list of NIDs present in peer. */
2618 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2619 curnis[ncurnis++] = lpni->lpni_nid;
2622 * Check for NIDs in pbuf not present in curnis[].
2623 * The loop starts at 1 to skip the loopback NID.
2625 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2626 for (j = 0; j < ncurnis; j++)
2627 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2630 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
2633 * Check for NIDs in curnis[] not present in pbuf.
2634 * The nested loop starts at 1 to skip the loopback NID.
2636 * But never add the loopback NID to delnis[]: if it is
2637 * present in curnis[] then this peer is for this node.
2639 for (i = 0; i < ncurnis; i++) {
2640 if (LNET_NETTYP(LNET_NIDNET(curnis[i])) == LOLND)
2642 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
2643 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
2645 * update the information we cache for the
2646 * peer with the latest information we
2649 lpni = lnet_find_peer_ni_locked(curnis[i]);
2651 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
2652 lnet_peer_ni_decref_locked(lpni);
2657 if (j == pbuf->pb_info.pi_nnis)
2658 delnis[ndelnis++] = curnis[i];
2662 * If we get here and the discovery is disabled then we don't want
2663 * to add or delete any NIs. We just updated the ones we have some
2664 * information on, and call it a day
2667 if (lnet_is_discovery_disabled(lp))
2670 for (i = 0; i < naddnis; i++) {
2671 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
2673 CERROR("Error adding NID %s to peer %s: %d\n",
2674 libcfs_nid2str(addnis[i].ns_nid),
2675 libcfs_nid2str(lp->lp_primary_nid), rc);
2679 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
2681 lpni->lpni_ns_status = addnis[i].ns_status;
2682 lnet_peer_ni_decref_locked(lpni);
2686 for (i = 0; i < ndelnis; i++) {
2688 * for routers it's okay to delete the primary_nid because
2689 * the upper layers don't really rely on it. So if we're
2690 * being told that the router changed its primary_nid
2691 * then it's okay to delete it.
2693 if (lp->lp_rtr_refcount > 0)
2694 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
2695 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2697 CERROR("Error deleting NID %s from peer %s: %d\n",
2698 libcfs_nid2str(delnis[i]),
2699 libcfs_nid2str(lp->lp_primary_nid), rc);
2705 * Errors other than -ENOMEM are due to peers having been
2706 * configured with DLC. Ignore these because DLC overrides
2711 LIBCFS_FREE(curnis, nnis * sizeof(*curnis));
2712 LIBCFS_FREE(addnis, nnis * sizeof(*addnis));
2713 LIBCFS_FREE(delnis, nnis * sizeof(*delnis));
2714 lnet_ping_buffer_decref(pbuf);
2715 CDEBUG(D_NET, "peer %s (%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
2718 spin_lock(&lp->lp_lock);
2719 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2720 lp->lp_state |= LNET_PEER_FORCE_PING;
2721 spin_unlock(&lp->lp_lock);
2727 * The data in pbuf says lp is its primary peer, but the data was
2728 * received by a different peer. Try to update lp with the data.
2731 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2733 struct lnet_handle_md mdh;
2735 /* Queue lp for discovery, and force it on the request queue. */
2736 lnet_net_lock(LNET_LOCK_EX);
2737 if (lnet_peer_queue_for_discovery(lp))
2738 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2739 lnet_net_unlock(LNET_LOCK_EX);
2741 LNetInvalidateMDHandle(&mdh);
2744 * Decide whether we can move the peer to the DATA_PRESENT state.
2746 * We replace stale data for a multi-rail peer, repair PING_FAILED
2747 * status, and preempt FORCE_PING.
2749 * If after that we have DATA_PRESENT, we merge it into this peer.
2751 spin_lock(&lp->lp_lock);
2752 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2753 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2754 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2755 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2756 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2757 lnet_ping_buffer_decref(pbuf);
2762 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2763 lnet_ping_buffer_decref(lp->lp_data);
2765 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2767 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2768 mdh = lp->lp_ping_mdh;
2769 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2770 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2771 lp->lp_ping_error = 0;
2773 if (lp->lp_state & LNET_PEER_FORCE_PING)
2774 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2775 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2776 spin_unlock(&lp->lp_lock);
2778 if (!LNetMDHandleIsInvalid(mdh))
2782 return lnet_peer_merge_data(lp, pbuf);
2784 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2788 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
2792 for (i = 0; i < pinfo->pi_nnis; i++) {
2793 if (pinfo->pi_ni[i].ns_nid == nid)
2801 * Update a peer using the data received.
2803 static int lnet_peer_data_present(struct lnet_peer *lp)
2804 __must_hold(&lp->lp_lock)
2806 struct lnet_ping_buffer *pbuf;
2807 struct lnet_peer_ni *lpni;
2808 lnet_nid_t nid = LNET_NID_ANY;
2814 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2815 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2816 spin_unlock(&lp->lp_lock);
2819 * Modifications of peer structures are done while holding the
2820 * ln_api_mutex. A global lock is required because we may be
2821 * modifying multiple peer structures, and a mutex greatly
2822 * simplifies memory management.
2824 * The actual changes to the data structures must also protect
2825 * against concurrent lookups, for which the lnet_net_lock in
2826 * LNET_LOCK_EX mode is used.
2828 mutex_lock(&the_lnet.ln_api_mutex);
2829 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2835 * If this peer is not on the peer list then it is being torn
2836 * down, and our reference count may be all that is keeping it
2837 * alive. Don't do any work on it.
2839 if (list_empty(&lp->lp_peer_list))
2842 flags = LNET_PEER_DISCOVERED;
2843 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2844 flags |= LNET_PEER_MULTI_RAIL;
2847 * Check whether the primary NID in the message matches the
2848 * primary NID of the peer. If it does, update the peer, if
2849 * it it does not, check whether there is already a peer with
2850 * that primary NID. If no such peer exists, try to update
2851 * the primary NID of the current peer (allowed if it was
2852 * created due to message traffic) and complete the update.
2853 * If the peer did exist, hand off the data to it.
2855 * The peer for the loopback interface is a special case: this
2856 * is the peer for the local node, and we want to set its
2857 * primary NID to the correct value here. Moreover, this peer
2858 * can show up with only the loopback NID in the ping buffer.
2860 if (pbuf->pb_info.pi_nnis <= 1)
2862 nid = pbuf->pb_info.pi_ni[1].ns_nid;
2863 if (LNET_NETTYP(LNET_NIDNET(lp->lp_primary_nid)) == LOLND) {
2864 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2866 rc = lnet_peer_merge_data(lp, pbuf);
2868 * if the primary nid of the peer is present in the ping info returned
2869 * from the peer, but it's not the local primary peer we have
2870 * cached and discovery is disabled, then we don't want to update
2871 * our local peer info, by adding or removing NIDs, we just want
2872 * to update the status of the nids that we currently have
2873 * recorded in that peer.
2875 } else if (lp->lp_primary_nid == nid ||
2876 (lnet_is_nid_in_ping_info(lp->lp_primary_nid, &pbuf->pb_info) &&
2877 lnet_is_discovery_disabled(lp))) {
2878 rc = lnet_peer_merge_data(lp, pbuf);
2880 lpni = lnet_find_peer_ni_locked(nid);
2882 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2884 CERROR("Primary NID error %s versus %s: %d\n",
2885 libcfs_nid2str(lp->lp_primary_nid),
2886 libcfs_nid2str(nid), rc);
2888 rc = lnet_peer_merge_data(lp, pbuf);
2891 struct lnet_peer *new_lp;
2892 new_lp = lpni->lpni_peer_net->lpn_peer;
2894 * if lp has discovery/MR enabled that means new_lp
2895 * should have discovery/MR enabled as well, since
2896 * it's the same peer, which we're about to merge
2898 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2899 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2900 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
2901 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
2903 rc = lnet_peer_set_primary_data(new_lp, pbuf);
2904 lnet_consolidate_routes_locked(lp, new_lp);
2905 lnet_peer_ni_decref_locked(lpni);
2909 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc,
2911 mutex_unlock(&the_lnet.ln_api_mutex);
2913 spin_lock(&lp->lp_lock);
2914 /* Tell discovery to re-check the peer immediately. */
2916 rc = LNET_REDISCOVER_PEER;
2921 * A ping failed. Clear the PING_FAILED state and set the
2922 * FORCE_PING state, to ensure a retry even if discovery is
2923 * disabled. This avoids being left with incorrect state.
2925 static int lnet_peer_ping_failed(struct lnet_peer *lp)
2926 __must_hold(&lp->lp_lock)
2928 struct lnet_handle_md mdh;
2931 mdh = lp->lp_ping_mdh;
2932 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2933 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2934 lp->lp_state |= LNET_PEER_FORCE_PING;
2935 rc = lp->lp_ping_error;
2936 lp->lp_ping_error = 0;
2937 spin_unlock(&lp->lp_lock);
2939 if (!LNetMDHandleIsInvalid(mdh))
2942 CDEBUG(D_NET, "peer %s:%d\n",
2943 libcfs_nid2str(lp->lp_primary_nid), rc);
2945 spin_lock(&lp->lp_lock);
2946 return rc ? rc : LNET_REDISCOVER_PEER;
2950 * Select NID to send a Ping or Push to.
2952 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
2954 struct lnet_peer_ni *lpni;
2956 /* Look for a direct-connected NID for this peer. */
2958 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2959 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
2964 return lpni->lpni_nid;
2966 /* Look for a routed-connected NID for this peer. */
2968 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2969 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
2974 return lpni->lpni_nid;
2976 return LNET_NID_ANY;
2979 /* Active side of ping. */
2980 static int lnet_peer_send_ping(struct lnet_peer *lp)
2981 __must_hold(&lp->lp_lock)
2988 lp->lp_state |= LNET_PEER_PING_SENT;
2989 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2990 spin_unlock(&lp->lp_lock);
2992 cpt = lnet_net_lock_current();
2993 /* Refcount for MD. */
2994 lnet_peer_addref_locked(lp);
2995 pnid = lnet_peer_select_nid(lp);
2996 lnet_net_unlock(cpt);
2998 nnis = MAX(lp->lp_data_nnis, LNET_INTERFACES_MIN);
3000 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
3001 the_lnet.ln_dc_eqh, false);
3004 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3005 * refcount on the peer, otherwise LNetMDUnlink will be called
3006 * which will eventually do that.
3010 lnet_peer_decref_locked(lp);
3011 lnet_net_unlock(cpt);
3012 rc = -rc; /* change the rc to negative value */
3014 } else if (rc < 0) {
3018 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3020 spin_lock(&lp->lp_lock);
3024 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
3026 * The errors that get us here are considered hard errors and
3027 * cause Discovery to terminate. So we clear PING_SENT, but do
3028 * not set either PING_FAILED or FORCE_PING. In fact we need
3029 * to clear PING_FAILED, because the unlink event handler will
3030 * have set it if we called LNetMDUnlink() above.
3032 spin_lock(&lp->lp_lock);
3033 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3038 * This function exists because you cannot call LNetMDUnlink() from an
3041 static int lnet_peer_push_failed(struct lnet_peer *lp)
3042 __must_hold(&lp->lp_lock)
3044 struct lnet_handle_md mdh;
3047 mdh = lp->lp_push_mdh;
3048 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3049 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3050 rc = lp->lp_push_error;
3051 lp->lp_push_error = 0;
3052 spin_unlock(&lp->lp_lock);
3054 if (!LNetMDHandleIsInvalid(mdh))
3057 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3058 spin_lock(&lp->lp_lock);
3059 return rc ? rc : LNET_REDISCOVER_PEER;
3062 /* Active side of push. */
3063 static int lnet_peer_send_push(struct lnet_peer *lp)
3064 __must_hold(&lp->lp_lock)
3066 struct lnet_ping_buffer *pbuf;
3067 struct lnet_process_id id;
3072 /* Don't push to a non-multi-rail peer. */
3073 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3074 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3078 lp->lp_state |= LNET_PEER_PUSH_SENT;
3079 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3080 spin_unlock(&lp->lp_lock);
3082 cpt = lnet_net_lock_current();
3083 pbuf = the_lnet.ln_ping_target;
3084 lnet_ping_buffer_addref(pbuf);
3085 lnet_net_unlock(cpt);
3087 /* Push source MD */
3088 md.start = &pbuf->pb_info;
3089 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3090 md.threshold = 2; /* Put/Ack */
3093 md.eq_handle = the_lnet.ln_dc_eqh;
3096 rc = LNetMDBind(md, LNET_UNLINK, &lp->lp_push_mdh);
3098 lnet_ping_buffer_decref(pbuf);
3099 CERROR("Can't bind push source MD: %d\n", rc);
3102 cpt = lnet_net_lock_current();
3103 /* Refcount for MD. */
3104 lnet_peer_addref_locked(lp);
3105 id.pid = LNET_PID_LUSTRE;
3106 id.nid = lnet_peer_select_nid(lp);
3107 lnet_net_unlock(cpt);
3109 if (id.nid == LNET_NID_ANY) {
3114 rc = LNetPut(LNET_NID_ANY, lp->lp_push_mdh,
3115 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3116 LNET_PROTO_PING_MATCHBITS, 0, 0);
3121 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3123 spin_lock(&lp->lp_lock);
3127 LNetMDUnlink(lp->lp_push_mdh);
3128 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3130 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
3132 * The errors that get us here are considered hard errors and
3133 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3134 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3135 * because the unlink event handler will have set it if we
3136 * called LNetMDUnlink() above.
3138 spin_lock(&lp->lp_lock);
3139 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3144 * An unrecoverable error was encountered during discovery.
3145 * Set error status in peer and abort discovery.
3147 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3149 CDEBUG(D_NET, "Discovery error %s: %d\n",
3150 libcfs_nid2str(lp->lp_primary_nid), error);
3152 spin_lock(&lp->lp_lock);
3153 lp->lp_dc_error = error;
3154 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3155 lp->lp_state |= LNET_PEER_REDISCOVER;
3156 spin_unlock(&lp->lp_lock);
3160 * Mark the peer as discovered.
3162 static int lnet_peer_discovered(struct lnet_peer *lp)
3163 __must_hold(&lp->lp_lock)
3165 lp->lp_state |= LNET_PEER_DISCOVERED;
3166 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3167 LNET_PEER_REDISCOVER);
3169 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3176 * Discovering this peer is taking too long. Cancel any Ping or Push
3177 * that discovery is waiting on by unlinking the relevant MDs. The
3178 * lnet_discovery_event_handler() will proceed from here and complete
3181 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
3183 struct lnet_handle_md ping_mdh;
3184 struct lnet_handle_md push_mdh;
3186 LNetInvalidateMDHandle(&ping_mdh);
3187 LNetInvalidateMDHandle(&push_mdh);
3189 spin_lock(&lp->lp_lock);
3190 if (lp->lp_state & LNET_PEER_PING_SENT) {
3191 ping_mdh = lp->lp_ping_mdh;
3192 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3194 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
3195 push_mdh = lp->lp_push_mdh;
3196 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3198 spin_unlock(&lp->lp_lock);
3200 if (!LNetMDHandleIsInvalid(ping_mdh))
3201 LNetMDUnlink(ping_mdh);
3202 if (!LNetMDHandleIsInvalid(push_mdh))
3203 LNetMDUnlink(push_mdh);
3207 * Wait for work to be queued or some other change that must be
3208 * attended to. Returns non-zero if the discovery thread should shut
3211 static int lnet_peer_discovery_wait_for_work(void)
3218 cpt = lnet_net_lock_current();
3220 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3221 TASK_INTERRUPTIBLE);
3222 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3224 if (lnet_push_target_resize_needed())
3226 if (!list_empty(&the_lnet.ln_dc_request))
3228 if (!list_empty(&the_lnet.ln_msg_resend))
3230 lnet_net_unlock(cpt);
3233 * wakeup max every second to check if there are peers that
3234 * have been stuck on the working queue for greater than
3237 schedule_timeout(cfs_time_seconds(1));
3238 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3239 cpt = lnet_net_lock_current();
3241 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3243 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3246 lnet_net_unlock(cpt);
3248 CDEBUG(D_NET, "woken: %d\n", rc);
3254 * Messages that were pending on a destroyed peer will be put on a global
3255 * resend list. The message resend list will be checked by
3256 * the discovery thread when it wakes up, and will resend messages. These
3257 * messages can still be sendable in the case the lpni which was the initial
3258 * cause of the message re-queue was transfered to another peer.
3260 * It is possible that LNet could be shutdown while we're iterating
3261 * through the list. lnet_shudown_lndnets() will attempt to access the
3262 * resend list, but will have to wait until the spinlock is released, by
3263 * which time there shouldn't be any more messages on the resend list.
3264 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3265 * for the messages so they can be released. The other case is that
3266 * lnet_shudown_lndnets() can finalize all the messages before this
3267 * function can visit the resend list, in which case this function will be
3270 static void lnet_resend_msgs(void)
3272 struct lnet_msg *msg, *tmp;
3273 struct list_head resend;
3276 INIT_LIST_HEAD(&resend);
3278 spin_lock(&the_lnet.ln_msg_resend_lock);
3279 list_splice(&the_lnet.ln_msg_resend, &resend);
3280 spin_unlock(&the_lnet.ln_msg_resend_lock);
3282 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3283 list_del_init(&msg->msg_list);
3284 rc = lnet_send(msg->msg_src_nid_param, msg,
3285 msg->msg_rtr_nid_param);
3287 CNETERR("Error sending %s to %s: %d\n",
3288 lnet_msgtyp2str(msg->msg_type),
3289 libcfs_id2str(msg->msg_target), rc);
3290 lnet_finalize(msg, rc);
3295 /* The discovery thread. */
3296 static int lnet_peer_discovery(void *arg)
3298 struct lnet_peer *lp;
3301 wait_for_completion(&the_lnet.ln_started);
3303 CDEBUG(D_NET, "started\n");
3304 cfs_block_allsigs();
3307 if (lnet_peer_discovery_wait_for_work())
3312 if (lnet_push_target_resize_needed())
3313 lnet_push_target_resize();
3315 lnet_net_lock(LNET_LOCK_EX);
3316 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3320 * Process all incoming discovery work requests. When
3321 * discovery must wait on a peer to change state, it
3322 * is added to the tail of the ln_dc_working queue. A
3323 * timestamp keeps track of when the peer was added,
3324 * so we can time out discovery requests that take too
3327 while (!list_empty(&the_lnet.ln_dc_request)) {
3328 lp = list_first_entry(&the_lnet.ln_dc_request,
3329 struct lnet_peer, lp_dc_list);
3330 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3332 * set the time the peer was put on the dc_working
3333 * queue. It shouldn't remain on the queue
3334 * forever, in case the GET message (for ping)
3335 * doesn't get a REPLY or the PUT message (for
3336 * push) doesn't get an ACK.
3338 lp->lp_last_queued = ktime_get_real_seconds();
3339 lnet_net_unlock(LNET_LOCK_EX);
3342 * Select an action depending on the state of
3343 * the peer and whether discovery is disabled.
3344 * The check whether discovery is disabled is
3345 * done after the code that handles processing
3346 * for arrived data, cleanup for failures, and
3347 * forcing a Ping or Push.
3349 spin_lock(&lp->lp_lock);
3350 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3351 libcfs_nid2str(lp->lp_primary_nid), lp,
3353 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3354 rc = lnet_peer_data_present(lp);
3355 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3356 rc = lnet_peer_ping_failed(lp);
3357 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3358 rc = lnet_peer_push_failed(lp);
3359 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3360 rc = lnet_peer_send_ping(lp);
3361 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3362 rc = lnet_peer_send_push(lp);
3363 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3364 rc = lnet_peer_send_ping(lp);
3365 else if (lnet_peer_needs_push(lp))
3366 rc = lnet_peer_send_push(lp);
3368 rc = lnet_peer_discovered(lp);
3369 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3370 libcfs_nid2str(lp->lp_primary_nid), lp,
3372 spin_unlock(&lp->lp_lock);
3374 lnet_net_lock(LNET_LOCK_EX);
3375 if (rc == LNET_REDISCOVER_PEER) {
3376 list_move(&lp->lp_dc_list,
3377 &the_lnet.ln_dc_request);
3379 lnet_peer_discovery_error(lp, rc);
3381 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3382 lnet_peer_discovery_complete(lp);
3383 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3387 lnet_net_unlock(LNET_LOCK_EX);
3390 CDEBUG(D_NET, "stopping\n");
3392 * Clean up before telling lnet_peer_discovery_stop() that
3393 * we're done. Use wake_up() below to somewhat reduce the
3394 * size of the thundering herd if there are multiple threads
3395 * waiting on discovery of a single peer.
3398 /* Queue cleanup 1: stop all pending pings and pushes. */
3399 lnet_net_lock(LNET_LOCK_EX);
3400 while (!list_empty(&the_lnet.ln_dc_working)) {
3401 lp = list_first_entry(&the_lnet.ln_dc_working,
3402 struct lnet_peer, lp_dc_list);
3403 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3404 lnet_net_unlock(LNET_LOCK_EX);
3405 lnet_peer_cancel_discovery(lp);
3406 lnet_net_lock(LNET_LOCK_EX);
3408 lnet_net_unlock(LNET_LOCK_EX);
3410 /* Queue cleanup 2: wait for the expired queue to clear. */
3411 while (!list_empty(&the_lnet.ln_dc_expired))
3412 schedule_timeout(cfs_time_seconds(1));
3414 /* Queue cleanup 3: clear the request queue. */
3415 lnet_net_lock(LNET_LOCK_EX);
3416 while (!list_empty(&the_lnet.ln_dc_request)) {
3417 lp = list_first_entry(&the_lnet.ln_dc_request,
3418 struct lnet_peer, lp_dc_list);
3419 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3420 lnet_peer_discovery_complete(lp);
3422 lnet_net_unlock(LNET_LOCK_EX);
3424 LNetEQFree(the_lnet.ln_dc_eqh);
3425 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3427 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3428 wake_up(&the_lnet.ln_dc_waitq);
3430 CDEBUG(D_NET, "stopped\n");
3435 /* ln_api_mutex is held on entry. */
3436 int lnet_peer_discovery_start(void)
3438 struct task_struct *task;
3441 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3444 rc = LNetEQAlloc(0, lnet_discovery_event_handler, &the_lnet.ln_dc_eqh);
3446 CERROR("Can't allocate discovery EQ: %d\n", rc);
3450 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3451 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3454 CERROR("Can't start peer discovery thread: %d\n", rc);
3456 LNetEQFree(the_lnet.ln_dc_eqh);
3457 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3459 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3462 CDEBUG(D_NET, "discovery start: %d\n", rc);
3467 /* ln_api_mutex is held on entry. */
3468 void lnet_peer_discovery_stop(void)
3470 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3473 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3474 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3476 /* In the LNetNIInit() path we may be stopping discovery before it
3477 * entered its work loop
3479 if (!completion_done(&the_lnet.ln_started))
3480 complete(&the_lnet.ln_started);
3482 wake_up(&the_lnet.ln_dc_waitq);
3484 wait_event(the_lnet.ln_dc_waitq,
3485 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3487 LASSERT(list_empty(&the_lnet.ln_dc_request));
3488 LASSERT(list_empty(&the_lnet.ln_dc_working));
3489 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3491 CDEBUG(D_NET, "discovery stopped\n");
3497 lnet_debug_peer(lnet_nid_t nid)
3499 char *aliveness = "NA";
3500 struct lnet_peer_ni *lp;
3503 cpt = lnet_cpt_of_nid(nid, NULL);
3506 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3508 lnet_net_unlock(cpt);
3509 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3513 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3514 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3516 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3517 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
3518 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3519 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3520 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3522 lnet_peer_ni_decref_locked(lp);
3524 lnet_net_unlock(cpt);
3527 /* Gathering information for userspace. */
3529 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3530 char aliveness[LNET_MAX_STR_LEN],
3531 __u32 *cpt_iter, __u32 *refcount,
3532 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3533 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3534 __u32 *peer_tx_qnob)
3536 struct lnet_peer_table *peer_table;
3537 struct lnet_peer_ni *lp;
3542 /* get the number of CPTs */
3543 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3545 /* if the cpt number to be examined is >= the number of cpts in
3546 * the system then indicate that there are no more cpts to examin
3548 if (*cpt_iter >= lncpt)
3551 /* get the current table */
3552 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3553 /* if the ptable is NULL then there are no more cpts to examine */
3554 if (peer_table == NULL)
3557 lnet_net_lock(*cpt_iter);
3559 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3560 struct list_head *peers = &peer_table->pt_hash[j];
3562 list_for_each_entry(lp, peers, lpni_hashlist) {
3563 if (peer_index-- > 0)
3566 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3567 if (lnet_isrouter(lp) ||
3568 lnet_peer_aliveness_enabled(lp))
3569 snprintf(aliveness, LNET_MAX_STR_LEN,
3570 lnet_is_peer_ni_alive(lp) ? "up" : "down");
3572 *nid = lp->lpni_nid;
3573 *refcount = atomic_read(&lp->lpni_refcount);
3574 *ni_peer_tx_credits =
3575 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3576 *peer_tx_credits = lp->lpni_txcredits;
3577 *peer_rtr_credits = lp->lpni_rtrcredits;
3578 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3579 *peer_tx_qnob = lp->lpni_txqnob;
3585 lnet_net_unlock(*cpt_iter);
3589 return found ? 0 : -ENOENT;
3592 /* ln_api_mutex is held, which keeps the peer list stable */
3593 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3595 struct lnet_ioctl_element_stats *lpni_stats;
3596 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3597 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3598 struct lnet_peer_ni_credit_info *lpni_info;
3599 struct lnet_peer_ni *lpni;
3600 struct lnet_peer *lp;
3605 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3612 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3613 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3614 size *= lp->lp_nnis;
3615 if (size > cfg->prcfg_size) {
3616 cfg->prcfg_size = size;
3621 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3622 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3623 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3624 cfg->prcfg_count = lp->lp_nnis;
3625 cfg->prcfg_size = size;
3626 cfg->prcfg_state = lp->lp_state;
3628 /* Allocate helper buffers. */
3630 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3633 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3636 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3637 if (!lpni_msg_stats)
3638 goto out_free_stats;
3639 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3641 goto out_free_msg_stats;
3646 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3647 nid = lpni->lpni_nid;
3648 if (copy_to_user(bulk, &nid, sizeof(nid)))
3649 goto out_free_hstats;
3650 bulk += sizeof(nid);
3652 memset(lpni_info, 0, sizeof(*lpni_info));
3653 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3654 if (lnet_isrouter(lpni) ||
3655 lnet_peer_aliveness_enabled(lpni))
3656 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3657 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
3659 lpni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
3660 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3661 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3662 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3663 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3664 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3665 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3666 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3667 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3668 goto out_free_hstats;
3669 bulk += sizeof(*lpni_info);
3671 memset(lpni_stats, 0, sizeof(*lpni_stats));
3672 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3673 LNET_STATS_TYPE_SEND);
3674 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3675 LNET_STATS_TYPE_RECV);
3676 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3677 LNET_STATS_TYPE_DROP);
3678 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3679 goto out_free_hstats;
3680 bulk += sizeof(*lpni_stats);
3681 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3682 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3683 goto out_free_hstats;
3684 bulk += sizeof(*lpni_msg_stats);
3685 lpni_hstats->hlpni_network_timeout =
3686 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3687 lpni_hstats->hlpni_remote_dropped =
3688 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3689 lpni_hstats->hlpni_remote_timeout =
3690 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3691 lpni_hstats->hlpni_remote_error =
3692 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3693 lpni_hstats->hlpni_health_value =
3694 atomic_read(&lpni->lpni_healthv);
3695 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3696 goto out_free_hstats;
3697 bulk += sizeof(*lpni_hstats);
3702 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3704 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3706 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3708 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
3710 lnet_peer_decref_locked(lp);
3716 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni)
3718 /* the mt could've shutdown and cleaned up the queues */
3719 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
3722 if (list_empty(&lpni->lpni_recovery) &&
3723 atomic_read(&lpni->lpni_healthv) < LNET_MAX_HEALTH_VALUE) {
3724 CERROR("lpni %s added to recovery queue. Health = %d\n",
3725 libcfs_nid2str(lpni->lpni_nid),
3726 atomic_read(&lpni->lpni_healthv));
3727 list_add_tail(&lpni->lpni_recovery, &the_lnet.ln_mt_peerNIRecovq);
3728 lnet_peer_ni_addref_locked(lpni);
3732 /* Call with the ln_api_mutex held */
3734 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3736 struct lnet_peer_table *ptable;
3737 struct lnet_peer *lp;
3738 struct lnet_peer_net *lpn;
3739 struct lnet_peer_ni *lpni;
3743 if (the_lnet.ln_state != LNET_STATE_RUNNING)
3747 lnet_net_lock(LNET_LOCK_EX);
3748 lpni = lnet_find_peer_ni_locked(nid);
3750 lnet_net_unlock(LNET_LOCK_EX);
3753 atomic_set(&lpni->lpni_healthv, value);
3754 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3755 lnet_peer_ni_decref_locked(lpni);
3756 lnet_net_unlock(LNET_LOCK_EX);
3760 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3763 * Walk all the peers and reset the healhv for each one to the
3766 lnet_net_lock(LNET_LOCK_EX);
3767 for (cpt = 0; cpt < lncpt; cpt++) {
3768 ptable = the_lnet.ln_peer_tables[cpt];
3769 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
3770 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
3771 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
3773 atomic_set(&lpni->lpni_healthv, value);
3774 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3779 lnet_net_unlock(LNET_LOCK_EX);