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;
263 * all peers created on a router should have health on
264 * if it's not already on.
266 if (the_lnet.ln_routing && !lnet_health_sensitivity)
267 lp->lp_health_sensitivity = 1;
270 * Turn off discovery for loopback peer. If you're creating a peer
271 * for the loopback interface then that was initiated when we
272 * attempted to send a message over the loopback. There is no need
273 * to ever use a different interface when sending messages to
276 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
277 lp->lp_state = LNET_PEER_NO_DISCOVERY;
278 lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
280 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
286 lnet_destroy_peer_locked(struct lnet_peer *lp)
288 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
290 LASSERT(atomic_read(&lp->lp_refcount) == 0);
291 LASSERT(lp->lp_rtr_refcount == 0);
292 LASSERT(list_empty(&lp->lp_peer_nets));
293 LASSERT(list_empty(&lp->lp_peer_list));
294 LASSERT(list_empty(&lp->lp_dc_list));
297 lnet_ping_buffer_decref(lp->lp_data);
300 * if there are messages still on the pending queue, then make
301 * sure to queue them on the ln_msg_resend list so they can be
302 * resent at a later point if the discovery thread is still
304 * If the discovery thread has stopped, then the wakeup will be a
305 * no-op, and it is expected the lnet_shutdown_lndnets() will
306 * eventually be called, which will traverse this list and
307 * finalize the messages on the list.
308 * We can not resend them now because we're holding the cpt lock.
309 * Releasing the lock can cause an inconsistent state
311 spin_lock(&the_lnet.ln_msg_resend_lock);
312 spin_lock(&lp->lp_lock);
313 list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
314 spin_unlock(&lp->lp_lock);
315 spin_unlock(&the_lnet.ln_msg_resend_lock);
316 wake_up(&the_lnet.ln_dc_waitq);
318 LIBCFS_FREE(lp, sizeof(*lp));
322 * Detach a peer_ni from its peer_net. If this was the last peer_ni on
323 * that peer_net, detach the peer_net from the peer.
325 * Call with lnet_net_lock/EX held
328 lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
330 struct lnet_peer_table *ptable;
331 struct lnet_peer_net *lpn;
332 struct lnet_peer *lp;
335 * Belts and suspenders: gracefully handle teardown of a
336 * partially connected peer_ni.
338 lpn = lpni->lpni_peer_net;
340 list_del_init(&lpni->lpni_peer_nis);
342 * If there are no lpni's left, we detach lpn from
343 * lp_peer_nets, so it cannot be found anymore.
345 if (list_empty(&lpn->lpn_peer_nis))
346 list_del_init(&lpn->lpn_peer_nets);
348 /* Update peer NID count. */
353 * If there are no more peer nets, make the peer unfindable
354 * via the peer_tables.
356 * Otherwise, if the peer is DISCOVERED, tell discovery to
357 * take another look at it. This is a no-op if discovery for
358 * this peer did the detaching.
360 if (list_empty(&lp->lp_peer_nets)) {
361 list_del_init(&lp->lp_peer_list);
362 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
364 } else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
365 /* Discovery isn't running, nothing to do here. */
366 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
367 lnet_peer_queue_for_discovery(lp);
368 wake_up(&the_lnet.ln_dc_waitq);
370 CDEBUG(D_NET, "peer %s NID %s\n",
371 libcfs_nid2str(lp->lp_primary_nid),
372 libcfs_nid2str(lpni->lpni_nid));
375 /* called with lnet_net_lock LNET_LOCK_EX held */
377 lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni, bool force)
379 struct lnet_peer_table *ptable = NULL;
381 /* don't remove a peer_ni if it's also a gateway */
382 if (lnet_isrouter(lpni) && !force) {
383 CERROR("Peer NI %s is a gateway. Can not delete it\n",
384 libcfs_nid2str(lpni->lpni_nid));
388 lnet_peer_remove_from_remote_list(lpni);
390 /* remove peer ni from the hash list. */
391 list_del_init(&lpni->lpni_hashlist);
394 * indicate the peer is being deleted so the monitor thread can
395 * remove it from the recovery queue.
397 spin_lock(&lpni->lpni_lock);
398 lpni->lpni_state |= LNET_PEER_NI_DELETING;
399 spin_unlock(&lpni->lpni_lock);
401 /* decrement the ref count on the peer table */
402 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
405 * The peer_ni can no longer be found with a lookup. But there
406 * can be current users, so keep track of it on the zombie
407 * list until the reference count has gone to zero.
409 * The last reference may be lost in a place where the
410 * lnet_net_lock locks only a single cpt, and that cpt may not
411 * be lpni->lpni_cpt. So the zombie list of lnet_peer_table
414 spin_lock(&ptable->pt_zombie_lock);
415 list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
416 ptable->pt_zombies++;
417 spin_unlock(&ptable->pt_zombie_lock);
419 /* no need to keep this peer_ni on the hierarchy anymore */
420 lnet_peer_detach_peer_ni_locked(lpni);
422 /* remove hashlist reference on peer_ni */
423 lnet_peer_ni_decref_locked(lpni);
428 void lnet_peer_uninit(void)
430 struct lnet_peer_ni *lpni, *tmp;
432 lnet_net_lock(LNET_LOCK_EX);
434 /* remove all peer_nis from the remote peer and the hash list */
435 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
436 lpni_on_remote_peer_ni_list)
437 lnet_peer_ni_del_locked(lpni, false);
439 lnet_peer_tables_destroy();
441 lnet_net_unlock(LNET_LOCK_EX);
445 lnet_peer_del_locked(struct lnet_peer *peer)
447 struct lnet_peer_ni *lpni = NULL, *lpni2;
450 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(peer->lp_primary_nid));
452 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
453 while (lpni != NULL) {
454 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
455 rc = lnet_peer_ni_del_locked(lpni, false);
465 lnet_peer_del(struct lnet_peer *peer)
467 lnet_net_lock(LNET_LOCK_EX);
468 lnet_peer_del_locked(peer);
469 lnet_net_unlock(LNET_LOCK_EX);
475 * Delete a NID from a peer. Call with ln_api_mutex held.
478 * -EPERM: Non-DLC deletion from DLC-configured peer.
479 * -ENOENT: No lnet_peer_ni corresponding to the nid.
480 * -ECHILD: The lnet_peer_ni isn't connected to the peer.
481 * -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
484 lnet_peer_del_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
486 struct lnet_peer_ni *lpni;
487 lnet_nid_t primary_nid = lp->lp_primary_nid;
489 bool force = (flags & LNET_PEER_RTR_NI_FORCE_DEL) ? true : false;
491 if (!(flags & LNET_PEER_CONFIGURED)) {
492 if (lp->lp_state & LNET_PEER_CONFIGURED) {
497 lpni = lnet_find_peer_ni_locked(nid);
502 lnet_peer_ni_decref_locked(lpni);
503 if (lp != lpni->lpni_peer_net->lpn_peer) {
509 * This function only allows deletion of the primary NID if it
512 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && !force) {
517 lnet_net_lock(LNET_LOCK_EX);
519 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && force) {
520 struct lnet_peer_ni *lpni2;
521 /* assign the next peer_ni to be the primary */
522 lpni2 = lnet_get_next_peer_ni_locked(lp, NULL, lpni);
524 lp->lp_primary_nid = lpni->lpni_nid;
526 rc = lnet_peer_ni_del_locked(lpni, force);
528 lnet_net_unlock(LNET_LOCK_EX);
531 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
532 libcfs_nid2str(primary_nid), libcfs_nid2str(nid), flags, rc);
538 lnet_peer_table_cleanup_locked(struct lnet_net *net,
539 struct lnet_peer_table *ptable)
542 struct lnet_peer_ni *next;
543 struct lnet_peer_ni *lpni;
544 struct lnet_peer *peer;
546 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
547 list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
549 if (net != NULL && net != lpni->lpni_net)
552 peer = lpni->lpni_peer_net->lpn_peer;
553 if (peer->lp_primary_nid != lpni->lpni_nid) {
554 lnet_peer_ni_del_locked(lpni, false);
558 * Removing the primary NID implies removing
559 * the entire peer. Advance next beyond any
560 * peer_ni that belongs to the same peer.
562 list_for_each_entry_from(next, &ptable->pt_hash[i],
564 if (next->lpni_peer_net->lpn_peer != peer)
567 lnet_peer_del_locked(peer);
573 lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
577 spin_lock(&ptable->pt_zombie_lock);
578 while (ptable->pt_zombies) {
579 spin_unlock(&ptable->pt_zombie_lock);
581 if (is_power_of_2(i)) {
583 "Waiting for %d zombies on peer table\n",
586 set_current_state(TASK_UNINTERRUPTIBLE);
587 schedule_timeout(cfs_time_seconds(1) >> 1);
588 spin_lock(&ptable->pt_zombie_lock);
590 spin_unlock(&ptable->pt_zombie_lock);
594 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
595 struct lnet_peer_table *ptable)
597 struct lnet_peer_ni *lp;
598 struct lnet_peer_ni *tmp;
602 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
603 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
605 if (net != lp->lpni_net)
608 if (!lnet_isrouter(lp))
611 gw_nid = lp->lpni_peer_net->lpn_peer->lp_primary_nid;
613 lnet_net_unlock(LNET_LOCK_EX);
614 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), gw_nid);
615 lnet_net_lock(LNET_LOCK_EX);
621 lnet_peer_tables_cleanup(struct lnet_net *net)
624 struct lnet_peer_table *ptable;
626 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
627 /* If just deleting the peers for a NI, get rid of any routes these
628 * peers are gateways for. */
629 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
630 lnet_net_lock(LNET_LOCK_EX);
631 lnet_peer_table_del_rtrs_locked(net, ptable);
632 lnet_net_unlock(LNET_LOCK_EX);
635 /* Start the cleanup process */
636 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
637 lnet_net_lock(LNET_LOCK_EX);
638 lnet_peer_table_cleanup_locked(net, ptable);
639 lnet_net_unlock(LNET_LOCK_EX);
642 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
643 lnet_peer_ni_finalize_wait(ptable);
646 static struct lnet_peer_ni *
647 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
649 struct list_head *peers;
650 struct lnet_peer_ni *lp;
652 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
654 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
655 list_for_each_entry(lp, peers, lpni_hashlist) {
656 if (lp->lpni_nid == nid) {
657 lnet_peer_ni_addref_locked(lp);
665 struct lnet_peer_ni *
666 lnet_find_peer_ni_locked(lnet_nid_t nid)
668 struct lnet_peer_ni *lpni;
669 struct lnet_peer_table *ptable;
672 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
674 ptable = the_lnet.ln_peer_tables[cpt];
675 lpni = lnet_get_peer_ni_locked(ptable, nid);
680 struct lnet_peer_ni *
681 lnet_peer_get_ni_locked(struct lnet_peer *lp, lnet_nid_t nid)
683 struct lnet_peer_net *lpn;
684 struct lnet_peer_ni *lpni;
686 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
690 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
691 if (lpni->lpni_nid == nid)
699 lnet_find_peer(lnet_nid_t nid)
701 struct lnet_peer_ni *lpni;
702 struct lnet_peer *lp = NULL;
705 cpt = lnet_net_lock_current();
706 lpni = lnet_find_peer_ni_locked(nid);
708 lp = lpni->lpni_peer_net->lpn_peer;
709 lnet_peer_addref_locked(lp);
710 lnet_peer_ni_decref_locked(lpni);
712 lnet_net_unlock(cpt);
717 struct lnet_peer_net *
718 lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
720 struct lnet_peer_net *net;
723 /* no net id provided return the first net */
724 net = list_first_entry_or_null(&lp->lp_peer_nets,
725 struct lnet_peer_net,
731 /* find the net after the one provided */
732 list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
733 if (net->lpn_net_id == prev_lpn_id) {
735 * if we reached the end of the list loop to the
738 if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
739 return list_first_entry_or_null(&lp->lp_peer_nets,
740 struct lnet_peer_net,
743 return list_next_entry(net, lpn_peer_nets);
750 struct lnet_peer_ni *
751 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
752 struct lnet_peer_net *peer_net,
753 struct lnet_peer_ni *prev)
755 struct lnet_peer_ni *lpni;
756 struct lnet_peer_net *net = peer_net;
760 if (list_empty(&peer->lp_peer_nets))
763 net = list_entry(peer->lp_peer_nets.next,
764 struct lnet_peer_net,
767 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
773 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
775 * if you reached the end of the peer ni list and the peer
776 * net is specified then there are no more peer nis in that
783 * we reached the end of this net ni list. move to the
786 if (prev->lpni_peer_net->lpn_peer_nets.next ==
788 /* no more nets and no more NIs. */
791 /* get the next net */
792 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
793 struct lnet_peer_net,
795 /* get the ni on it */
796 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
802 /* there are more nis left */
803 lpni = list_entry(prev->lpni_peer_nis.next,
804 struct lnet_peer_ni, lpni_peer_nis);
809 /* Call with the ln_api_mutex held */
810 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
812 struct lnet_process_id id;
813 struct lnet_peer_table *ptable;
814 struct lnet_peer *lp;
823 if (the_lnet.ln_state != LNET_STATE_RUNNING)
826 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
829 * Count the number of peers, and return E2BIG if the buffer
830 * is too small. We'll also return the desired size.
833 for (cpt = 0; cpt < lncpt; cpt++) {
834 ptable = the_lnet.ln_peer_tables[cpt];
835 count += ptable->pt_peers;
837 size = count * sizeof(*ids);
842 * Walk the peer lists and copy out the primary nids.
843 * This is safe because the peer lists are only modified
844 * while the ln_api_mutex is held. So we don't need to
845 * hold the lnet_net_lock as well, and can therefore
846 * directly call copy_to_user().
849 memset(&id, 0, sizeof(id));
850 id.pid = LNET_PID_LUSTRE;
852 for (cpt = 0; cpt < lncpt; cpt++) {
853 ptable = the_lnet.ln_peer_tables[cpt];
854 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
857 id.nid = lp->lp_primary_nid;
858 if (copy_to_user(&ids[i], &id, sizeof(id)))
871 * Start pushes to peers that need to be updated for a configuration
872 * change on this node.
875 lnet_push_update_to_peers(int force)
877 struct lnet_peer_table *ptable;
878 struct lnet_peer *lp;
882 lnet_net_lock(LNET_LOCK_EX);
883 if (lnet_peer_discovery_disabled)
885 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
886 for (cpt = 0; cpt < lncpt; cpt++) {
887 ptable = the_lnet.ln_peer_tables[cpt];
888 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
890 spin_lock(&lp->lp_lock);
891 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
892 lp->lp_state |= LNET_PEER_FORCE_PUSH;
893 spin_unlock(&lp->lp_lock);
895 if (lnet_peer_needs_push(lp))
896 lnet_peer_queue_for_discovery(lp);
899 lnet_net_unlock(LNET_LOCK_EX);
900 wake_up(&the_lnet.ln_dc_waitq);
904 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
905 * this is a preferred point-to-point path. Call with lnet_net_lock in
909 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
913 if (lpni->lpni_pref_nnids == 0)
915 if (lpni->lpni_pref_nnids == 1)
916 return lpni->lpni_pref.nid == nid;
917 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
918 if (lpni->lpni_pref.nids[i] == nid)
925 * Set a single ni as preferred, provided no preferred ni is already
926 * defined. Only to be used for non-multi-rail peer_ni.
929 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
933 spin_lock(&lpni->lpni_lock);
934 if (nid == LNET_NID_ANY) {
936 } else if (lpni->lpni_pref_nnids > 0) {
938 } else if (lpni->lpni_pref_nnids == 0) {
939 lpni->lpni_pref.nid = nid;
940 lpni->lpni_pref_nnids = 1;
941 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
943 spin_unlock(&lpni->lpni_lock);
945 CDEBUG(D_NET, "peer %s nid %s: %d\n",
946 libcfs_nid2str(lpni->lpni_nid), libcfs_nid2str(nid), rc);
951 * Clear the preferred NID from a non-multi-rail peer_ni, provided
952 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
955 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
959 spin_lock(&lpni->lpni_lock);
960 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
961 lpni->lpni_pref_nnids = 0;
962 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
963 } else if (lpni->lpni_pref_nnids == 0) {
968 spin_unlock(&lpni->lpni_lock);
970 CDEBUG(D_NET, "peer %s: %d\n",
971 libcfs_nid2str(lpni->lpni_nid), rc);
976 * Clear the preferred NIDs from a non-multi-rail peer.
979 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
981 struct lnet_peer_ni *lpni = NULL;
983 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
984 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
988 lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
990 lnet_nid_t *nids = NULL;
991 lnet_nid_t *oldnids = NULL;
992 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
997 if (nid == LNET_NID_ANY) {
1002 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
1007 /* A non-MR node may have only one preferred NI per peer_ni */
1008 if (lpni->lpni_pref_nnids > 0) {
1009 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1015 if (lpni->lpni_pref_nnids != 0) {
1016 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1017 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1022 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
1023 if (lpni->lpni_pref.nids[i] == nid) {
1024 LIBCFS_FREE(nids, size);
1028 nids[i] = lpni->lpni_pref.nids[i];
1033 lnet_net_lock(LNET_LOCK_EX);
1034 spin_lock(&lpni->lpni_lock);
1035 if (lpni->lpni_pref_nnids == 0) {
1036 lpni->lpni_pref.nid = nid;
1038 oldnids = lpni->lpni_pref.nids;
1039 lpni->lpni_pref.nids = nids;
1041 lpni->lpni_pref_nnids++;
1042 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1043 spin_unlock(&lpni->lpni_lock);
1044 lnet_net_unlock(LNET_LOCK_EX);
1047 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1048 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
1051 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
1052 spin_lock(&lpni->lpni_lock);
1053 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1054 spin_unlock(&lpni->lpni_lock);
1056 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1057 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1062 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1064 lnet_nid_t *nids = NULL;
1065 lnet_nid_t *oldnids = NULL;
1066 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1071 if (lpni->lpni_pref_nnids == 0) {
1076 if (lpni->lpni_pref_nnids == 1) {
1077 if (lpni->lpni_pref.nid != nid) {
1081 } else if (lpni->lpni_pref_nnids == 2) {
1082 if (lpni->lpni_pref.nids[0] != nid &&
1083 lpni->lpni_pref.nids[1] != nid) {
1088 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1089 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1094 for (i = 0, j = 0; i < lpni->lpni_pref_nnids; i++) {
1095 if (lpni->lpni_pref.nids[i] != nid)
1097 nids[j++] = lpni->lpni_pref.nids[i];
1099 /* Check if we actually removed a nid. */
1100 if (j == lpni->lpni_pref_nnids) {
1101 LIBCFS_FREE(nids, size);
1107 lnet_net_lock(LNET_LOCK_EX);
1108 spin_lock(&lpni->lpni_lock);
1109 if (lpni->lpni_pref_nnids == 1) {
1110 lpni->lpni_pref.nid = LNET_NID_ANY;
1111 } else if (lpni->lpni_pref_nnids == 2) {
1112 oldnids = lpni->lpni_pref.nids;
1113 if (oldnids[0] == nid)
1114 lpni->lpni_pref.nid = oldnids[1];
1116 lpni->lpni_pref.nid = oldnids[2];
1118 oldnids = lpni->lpni_pref.nids;
1119 lpni->lpni_pref.nids = nids;
1121 lpni->lpni_pref_nnids--;
1122 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1123 spin_unlock(&lpni->lpni_lock);
1124 lnet_net_unlock(LNET_LOCK_EX);
1127 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1128 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
1131 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1132 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1137 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1139 struct lnet_peer_ni *lpni;
1140 lnet_nid_t primary_nid = nid;
1142 lpni = lnet_find_peer_ni_locked(nid);
1144 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
1145 lnet_peer_ni_decref_locked(lpni);
1152 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1153 __must_hold(&lp->lp_lock)
1155 if (lnet_peer_discovery_disabled)
1158 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1159 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1170 lnet_is_discovery_disabled(struct lnet_peer *lp)
1174 spin_lock(&lp->lp_lock);
1175 rc = lnet_is_discovery_disabled_locked(lp);
1176 spin_unlock(&lp->lp_lock);
1182 LNetPrimaryNID(lnet_nid_t nid)
1184 struct lnet_peer *lp;
1185 struct lnet_peer_ni *lpni;
1186 lnet_nid_t primary_nid = nid;
1190 cpt = lnet_net_lock_current();
1191 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1196 lp = lpni->lpni_peer_net->lpn_peer;
1198 while (!lnet_peer_is_uptodate(lp)) {
1199 rc = lnet_discover_peer_locked(lpni, cpt, true);
1202 lp = lpni->lpni_peer_net->lpn_peer;
1204 /* Only try once if discovery is disabled */
1205 if (lnet_is_discovery_disabled(lp))
1208 primary_nid = lp->lp_primary_nid;
1210 lnet_peer_ni_decref_locked(lpni);
1212 lnet_net_unlock(cpt);
1214 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1215 libcfs_nid2str(primary_nid), rc);
1218 EXPORT_SYMBOL(LNetPrimaryNID);
1220 struct lnet_peer_net *
1221 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1223 struct lnet_peer_net *peer_net;
1224 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1225 if (peer_net->lpn_net_id == net_id)
1232 * Attach a peer_ni to a peer_net and peer. This function assumes
1233 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1234 * may be attached to a different peer, in which case it will be
1235 * properly detached first. The whole operation is done atomically.
1237 * Always returns 0. This is the last function called from functions
1238 * that do return an int, so returning 0 here allows the compiler to
1242 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1243 struct lnet_peer_net *lpn,
1244 struct lnet_peer_ni *lpni,
1247 struct lnet_peer_table *ptable;
1249 /* Install the new peer_ni */
1250 lnet_net_lock(LNET_LOCK_EX);
1251 /* Add peer_ni to global peer table hash, if necessary. */
1252 if (list_empty(&lpni->lpni_hashlist)) {
1253 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1255 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1256 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1257 ptable->pt_version++;
1258 /* This is the 1st refcount on lpni. */
1259 atomic_inc(&lpni->lpni_refcount);
1262 /* Detach the peer_ni from an existing peer, if necessary. */
1263 if (lpni->lpni_peer_net) {
1264 LASSERT(lpni->lpni_peer_net != lpn);
1265 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1266 lnet_peer_detach_peer_ni_locked(lpni);
1267 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1268 lpni->lpni_peer_net = NULL;
1271 /* Add peer_ni to peer_net */
1272 lpni->lpni_peer_net = lpn;
1273 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1274 lnet_peer_net_addref_locked(lpn);
1276 /* Add peer_net to peer */
1277 if (!lpn->lpn_peer) {
1279 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1280 lnet_peer_addref_locked(lp);
1283 /* Add peer to global peer list, if necessary */
1284 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1285 if (list_empty(&lp->lp_peer_list)) {
1286 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1291 /* Update peer state */
1292 spin_lock(&lp->lp_lock);
1293 if (flags & LNET_PEER_CONFIGURED) {
1294 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1295 lp->lp_state |= LNET_PEER_CONFIGURED;
1297 if (flags & LNET_PEER_MULTI_RAIL) {
1298 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1299 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1300 lnet_peer_clr_non_mr_pref_nids(lp);
1303 spin_unlock(&lp->lp_lock);
1306 lnet_net_unlock(LNET_LOCK_EX);
1308 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1309 libcfs_nid2str(lp->lp_primary_nid),
1310 libcfs_nid2str(lpni->lpni_nid), flags);
1316 * Create a new peer, with nid as its primary nid.
1318 * Call with the lnet_api_mutex held.
1321 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1323 struct lnet_peer *lp;
1324 struct lnet_peer_net *lpn;
1325 struct lnet_peer_ni *lpni;
1328 LASSERT(nid != LNET_NID_ANY);
1331 * No need for the lnet_net_lock here, because the
1332 * lnet_api_mutex is held.
1334 lpni = lnet_find_peer_ni_locked(nid);
1336 /* A peer with this NID already exists. */
1337 lp = lpni->lpni_peer_net->lpn_peer;
1338 lnet_peer_ni_decref_locked(lpni);
1340 * This is an error if the peer was configured and the
1341 * primary NID differs or an attempt is made to change
1342 * the Multi-Rail flag. Otherwise the assumption is
1343 * that an existing peer is being modified.
1345 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1346 if (lp->lp_primary_nid != nid)
1348 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1352 /* Delete and recreate as a configured peer. */
1356 /* Create peer, peer_net, and peer_ni. */
1358 lp = lnet_peer_alloc(nid);
1361 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1364 lpni = lnet_peer_ni_alloc(nid);
1368 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1371 LIBCFS_FREE(lpn, sizeof(*lpn));
1373 LIBCFS_FREE(lp, sizeof(*lp));
1375 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1376 libcfs_nid2str(nid), flags, rc);
1381 * Add a NID to a peer. Call with ln_api_mutex held.
1384 * -EPERM: Non-DLC addition to a DLC-configured peer.
1385 * -EEXIST: The NID was configured by DLC for a different peer.
1386 * -ENOMEM: Out of memory.
1387 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1388 * non-multi-rail peer.
1391 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1393 struct lnet_peer_net *lpn;
1394 struct lnet_peer_ni *lpni;
1398 LASSERT(nid != LNET_NID_ANY);
1400 /* A configured peer can only be updated through configuration. */
1401 if (!(flags & LNET_PEER_CONFIGURED)) {
1402 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1409 * The MULTI_RAIL flag can be set but not cleared, because
1410 * that would leave the peer struct in an invalid state.
1412 if (flags & LNET_PEER_MULTI_RAIL) {
1413 spin_lock(&lp->lp_lock);
1414 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1415 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1416 lnet_peer_clr_non_mr_pref_nids(lp);
1418 spin_unlock(&lp->lp_lock);
1419 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1424 lpni = lnet_find_peer_ni_locked(nid);
1427 * A peer_ni already exists. This is only a problem if
1428 * it is not connected to this peer and was configured
1431 lnet_peer_ni_decref_locked(lpni);
1432 if (lpni->lpni_peer_net->lpn_peer == lp)
1434 if (lnet_peer_ni_is_configured(lpni)) {
1438 /* If this is the primary NID, destroy the peer. */
1439 if (lnet_peer_ni_is_primary(lpni)) {
1440 struct lnet_peer *rtr_lp =
1441 lpni->lpni_peer_net->lpn_peer;
1442 int rtr_refcount = rtr_lp->lp_rtr_refcount;
1444 * if we're trying to delete a router it means
1445 * we're moving this peer NI to a new peer so must
1446 * transfer router properties to the new peer
1448 if (rtr_refcount > 0) {
1449 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1450 lnet_rtr_transfer_to_peer(rtr_lp, lp);
1452 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1453 lpni = lnet_peer_ni_alloc(nid);
1460 lpni = lnet_peer_ni_alloc(nid);
1468 * Get the peer_net. Check that we're not adding a second
1469 * peer_ni on a peer_net of a non-multi-rail peer.
1471 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1473 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1478 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1483 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1486 /* If the peer_ni was allocated above its peer_net pointer is NULL */
1487 if (!lpni->lpni_peer_net)
1488 LIBCFS_FREE(lpni, sizeof(*lpni));
1490 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1491 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1497 * Update the primary NID of a peer, if possible.
1499 * Call with the lnet_api_mutex held.
1502 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1504 lnet_nid_t old = lp->lp_primary_nid;
1507 if (lp->lp_primary_nid == nid)
1509 rc = lnet_peer_add_nid(lp, nid, flags);
1512 lp->lp_primary_nid = nid;
1514 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1515 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1520 * lpni creation initiated due to traffic either sending or receiving.
1523 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1525 struct lnet_peer *lp;
1526 struct lnet_peer_net *lpn;
1527 struct lnet_peer_ni *lpni;
1529 * Assume peer is Multi-Rail capable and let discovery find out
1532 unsigned flags = LNET_PEER_MULTI_RAIL;
1535 if (nid == LNET_NID_ANY) {
1540 /* lnet_net_lock is not needed here because ln_api_lock is held */
1541 lpni = lnet_find_peer_ni_locked(nid);
1544 * We must have raced with another thread. Since we
1545 * know next to nothing about a peer_ni created by
1546 * traffic, we just assume everything is ok and
1549 lnet_peer_ni_decref_locked(lpni);
1553 /* Create peer, peer_net, and peer_ni. */
1555 lp = lnet_peer_alloc(nid);
1558 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1561 lpni = lnet_peer_ni_alloc(nid);
1564 if (pref != LNET_NID_ANY)
1565 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1567 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1570 LIBCFS_FREE(lpn, sizeof(*lpn));
1572 LIBCFS_FREE(lp, sizeof(*lp));
1574 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1579 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1581 * This API handles the following combinations:
1582 * Create a peer with its primary NI if only the prim_nid is provided
1583 * Add a NID to a peer identified by the prim_nid. The peer identified
1584 * by the prim_nid must already exist.
1585 * The peer being created may be non-MR.
1587 * The caller must hold ln_api_mutex. This prevents the peer from
1588 * being created/modified/deleted by a different thread.
1591 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1593 struct lnet_peer *lp = NULL;
1594 struct lnet_peer_ni *lpni;
1597 /* The prim_nid must always be specified */
1598 if (prim_nid == LNET_NID_ANY)
1601 flags = LNET_PEER_CONFIGURED;
1603 flags |= LNET_PEER_MULTI_RAIL;
1606 * If nid isn't specified, we must create a new peer with
1607 * prim_nid as its primary nid.
1609 if (nid == LNET_NID_ANY)
1610 return lnet_peer_add(prim_nid, flags);
1612 /* Look up the prim_nid, which must exist. */
1613 lpni = lnet_find_peer_ni_locked(prim_nid);
1616 lnet_peer_ni_decref_locked(lpni);
1617 lp = lpni->lpni_peer_net->lpn_peer;
1619 /* Peer must have been configured. */
1620 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1621 CDEBUG(D_NET, "peer %s was not configured\n",
1622 libcfs_nid2str(prim_nid));
1626 /* Primary NID must match */
1627 if (lp->lp_primary_nid != prim_nid) {
1628 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1629 libcfs_nid2str(prim_nid),
1630 libcfs_nid2str(lp->lp_primary_nid));
1634 /* Multi-Rail flag must match. */
1635 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1636 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1637 libcfs_nid2str(prim_nid));
1641 return lnet_peer_add_nid(lp, nid, flags);
1645 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1647 * This API handles the following combinations:
1648 * Delete a NI from a peer if both prim_nid and nid are provided.
1649 * Delete a peer if only prim_nid is provided.
1650 * Delete a peer if its primary nid is provided.
1652 * The caller must hold ln_api_mutex. This prevents the peer from
1653 * being modified/deleted by a different thread.
1656 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1658 struct lnet_peer *lp;
1659 struct lnet_peer_ni *lpni;
1662 if (prim_nid == LNET_NID_ANY)
1665 lpni = lnet_find_peer_ni_locked(prim_nid);
1668 lnet_peer_ni_decref_locked(lpni);
1669 lp = lpni->lpni_peer_net->lpn_peer;
1671 if (prim_nid != lp->lp_primary_nid) {
1672 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1673 libcfs_nid2str(prim_nid),
1674 libcfs_nid2str(lp->lp_primary_nid));
1678 lnet_net_lock(LNET_LOCK_EX);
1679 if (lp->lp_rtr_refcount > 0) {
1680 lnet_net_unlock(LNET_LOCK_EX);
1681 CERROR("%s is a router. Can not be deleted\n",
1682 libcfs_nid2str(prim_nid));
1685 lnet_net_unlock(LNET_LOCK_EX);
1687 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1688 return lnet_peer_del(lp);
1690 flags = LNET_PEER_CONFIGURED;
1691 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1692 flags |= LNET_PEER_MULTI_RAIL;
1694 return lnet_peer_del_nid(lp, nid, flags);
1698 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
1700 struct lnet_peer_table *ptable;
1701 struct lnet_peer_net *lpn;
1703 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1705 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
1706 LASSERT(list_empty(&lpni->lpni_txq));
1707 LASSERT(lpni->lpni_txqnob == 0);
1708 LASSERT(list_empty(&lpni->lpni_peer_nis));
1709 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1711 lpn = lpni->lpni_peer_net;
1712 lpni->lpni_peer_net = NULL;
1713 lpni->lpni_net = NULL;
1715 /* remove the peer ni from the zombie list */
1716 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1717 spin_lock(&ptable->pt_zombie_lock);
1718 list_del_init(&lpni->lpni_hashlist);
1719 ptable->pt_zombies--;
1720 spin_unlock(&ptable->pt_zombie_lock);
1722 if (lpni->lpni_pref_nnids > 1) {
1723 LIBCFS_FREE(lpni->lpni_pref.nids,
1724 sizeof(*lpni->lpni_pref.nids) * lpni->lpni_pref_nnids);
1726 LIBCFS_FREE(lpni, sizeof(*lpni));
1728 lnet_peer_net_decref_locked(lpn);
1731 struct lnet_peer_ni *
1732 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1734 struct lnet_peer_ni *lpni = NULL;
1737 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1738 return ERR_PTR(-ESHUTDOWN);
1741 * find if a peer_ni already exists.
1742 * If so then just return that.
1744 lpni = lnet_find_peer_ni_locked(nid);
1748 lnet_net_unlock(cpt);
1750 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1753 goto out_net_relock;
1756 lpni = lnet_find_peer_ni_locked(nid);
1766 * Get a peer_ni for the given nid, create it if necessary. Takes a
1767 * hold on the peer_ni.
1769 struct lnet_peer_ni *
1770 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1772 struct lnet_peer_ni *lpni = NULL;
1775 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1776 return ERR_PTR(-ESHUTDOWN);
1779 * find if a peer_ni already exists.
1780 * If so then just return that.
1782 lpni = lnet_find_peer_ni_locked(nid);
1788 * use the lnet_api_mutex to serialize the creation of the peer_ni
1789 * and the creation/deletion of the local ni/net. When a local ni is
1790 * created, if there exists a set of peer_nis on that network,
1791 * they need to be traversed and updated. When a local NI is
1792 * deleted, which could result in a network being deleted, then
1793 * all peer nis on that network need to be removed as well.
1795 * Creation through traffic should also be serialized with
1796 * creation through DLC.
1798 lnet_net_unlock(cpt);
1799 mutex_lock(&the_lnet.ln_api_mutex);
1801 * Shutdown is only set under the ln_api_lock, so a single
1802 * check here is sufficent.
1804 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1805 lpni = ERR_PTR(-ESHUTDOWN);
1806 goto out_mutex_unlock;
1809 rc = lnet_peer_ni_traffic_add(nid, pref);
1812 goto out_mutex_unlock;
1815 lpni = lnet_find_peer_ni_locked(nid);
1819 mutex_unlock(&the_lnet.ln_api_mutex);
1822 /* Lock has been dropped, check again for shutdown. */
1823 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1825 lnet_peer_ni_decref_locked(lpni);
1826 lpni = ERR_PTR(-ESHUTDOWN);
1833 lnet_peer_gw_discovery(struct lnet_peer *lp)
1837 spin_lock(&lp->lp_lock);
1838 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
1840 spin_unlock(&lp->lp_lock);
1846 lnet_peer_is_uptodate(struct lnet_peer *lp)
1850 spin_lock(&lp->lp_lock);
1851 rc = lnet_peer_is_uptodate_locked(lp);
1852 spin_unlock(&lp->lp_lock);
1857 * Is a peer uptodate from the point of view of discovery?
1859 * If it is currently being processed, obviously not.
1860 * A forced Ping or Push is also handled by the discovery thread.
1862 * Otherwise look at whether the peer needs rediscovering.
1865 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
1866 __must_hold(&lp->lp_lock)
1870 if (lp->lp_state & (LNET_PEER_DISCOVERING |
1871 LNET_PEER_FORCE_PING |
1872 LNET_PEER_FORCE_PUSH)) {
1874 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
1876 } else if (lnet_peer_needs_push(lp)) {
1878 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
1879 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
1891 * Queue a peer for the attention of the discovery thread. Call with
1892 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
1893 * -EALREADY if the peer was already queued.
1895 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
1899 spin_lock(&lp->lp_lock);
1900 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
1901 lp->lp_state |= LNET_PEER_DISCOVERING;
1902 spin_unlock(&lp->lp_lock);
1903 if (list_empty(&lp->lp_dc_list)) {
1904 lnet_peer_addref_locked(lp);
1905 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
1906 wake_up(&the_lnet.ln_dc_waitq);
1912 CDEBUG(D_NET, "Queue peer %s: %d\n",
1913 libcfs_nid2str(lp->lp_primary_nid), rc);
1919 * Discovery of a peer is complete. Wake all waiters on the peer.
1920 * Call with lnet_net_lock/EX held.
1922 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
1924 struct lnet_msg *msg, *tmp;
1926 struct list_head pending_msgs;
1928 INIT_LIST_HEAD(&pending_msgs);
1930 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
1931 libcfs_nid2str(lp->lp_primary_nid));
1933 list_del_init(&lp->lp_dc_list);
1934 spin_lock(&lp->lp_lock);
1935 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
1936 spin_unlock(&lp->lp_lock);
1937 wake_up_all(&lp->lp_dc_waitq);
1939 if (lp->lp_rtr_refcount > 0)
1940 lnet_router_discovery_complete(lp);
1942 lnet_net_unlock(LNET_LOCK_EX);
1944 /* iterate through all pending messages and send them again */
1945 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
1946 list_del_init(&msg->msg_list);
1947 if (lp->lp_dc_error) {
1948 lnet_finalize(msg, lp->lp_dc_error);
1952 CDEBUG(D_NET, "sending pending message %s to target %s\n",
1953 lnet_msgtyp2str(msg->msg_type),
1954 libcfs_id2str(msg->msg_target));
1955 rc = lnet_send(msg->msg_src_nid_param, msg,
1956 msg->msg_rtr_nid_param);
1958 CNETERR("Error sending %s to %s: %d\n",
1959 lnet_msgtyp2str(msg->msg_type),
1960 libcfs_id2str(msg->msg_target), rc);
1961 lnet_finalize(msg, rc);
1964 lnet_net_lock(LNET_LOCK_EX);
1965 lnet_peer_decref_locked(lp);
1969 * Handle inbound push.
1970 * Like any event handler, called with lnet_res_lock/CPT held.
1972 void lnet_peer_push_event(struct lnet_event *ev)
1974 struct lnet_ping_buffer *pbuf = ev->md.user_ptr;
1975 struct lnet_peer *lp;
1977 /* lnet_find_peer() adds a refcount */
1978 lp = lnet_find_peer(ev->source.nid);
1980 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
1981 libcfs_nid2str(ev->initiator.nid),
1982 libcfs_nid2str(ev->source.nid));
1986 /* Ensure peer state remains consistent while we modify it. */
1987 spin_lock(&lp->lp_lock);
1990 * If some kind of error happened the contents of the message
1991 * cannot be used. Clear the NIDS_UPTODATE and set the
1992 * FORCE_PING flag to trigger a ping.
1995 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1996 lp->lp_state |= LNET_PEER_FORCE_PING;
1997 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
1999 libcfs_nid2str(lp->lp_primary_nid),
2000 libcfs_nid2str(ev->source.nid));
2005 * A push with invalid or corrupted info. Clear the UPTODATE
2006 * flag to trigger a ping.
2008 if (lnet_ping_info_validate(&pbuf->pb_info)) {
2009 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2010 lp->lp_state |= LNET_PEER_FORCE_PING;
2011 CDEBUG(D_NET, "Corrupted Push from %s\n",
2012 libcfs_nid2str(lp->lp_primary_nid));
2017 * Make sure we'll allocate the correct size ping buffer when
2020 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2021 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2024 * A non-Multi-Rail peer is not supposed to be capable of
2027 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2028 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2029 libcfs_nid2str(lp->lp_primary_nid));
2034 * Check the MULTIRAIL flag. Complain if the peer was DLC
2035 * configured without it.
2037 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
2038 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2039 CERROR("Push says %s is Multi-Rail, DLC says not\n",
2040 libcfs_nid2str(lp->lp_primary_nid));
2042 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2043 lnet_peer_clr_non_mr_pref_nids(lp);
2048 * The peer may have discovery disabled at its end. Set
2049 * NO_DISCOVERY as appropriate.
2051 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2052 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2053 libcfs_nid2str(lp->lp_primary_nid));
2054 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2055 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2056 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2057 libcfs_nid2str(lp->lp_primary_nid));
2058 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2062 * Check for truncation of the Put message. Clear the
2063 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2064 * and tell discovery to allocate a bigger buffer.
2066 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2067 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2068 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2069 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2070 lp->lp_state |= LNET_PEER_FORCE_PING;
2071 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2072 libcfs_nid2str(lp->lp_primary_nid),
2073 pbuf->pb_info.pi_nnis);
2077 /* always assume new data */
2078 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2079 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2082 * If there is data present that hasn't been processed yet,
2083 * we'll replace it if the Put contained newer data and it
2084 * fits. We're racing with a Ping or earlier Push in this
2087 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2088 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2089 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2090 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2091 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2092 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2093 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2094 libcfs_nid2str(lp->lp_primary_nid),
2095 LNET_PING_BUFFER_SEQNO(pbuf),
2096 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2102 * Allocate a buffer to copy the data. On a failure we drop
2103 * the Push and set FORCE_PING to force the discovery
2104 * thread to fix the problem by pinging the peer.
2106 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2108 lp->lp_state |= LNET_PEER_FORCE_PING;
2109 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2110 libcfs_nid2str(lp->lp_primary_nid),
2111 LNET_PING_BUFFER_SEQNO(pbuf));
2116 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2117 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2118 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2119 CDEBUG(D_NET, "Received Push %s %u\n",
2120 libcfs_nid2str(lp->lp_primary_nid),
2121 LNET_PING_BUFFER_SEQNO(pbuf));
2125 * Queue the peer for discovery if not done, force it on the request
2126 * queue and wake the discovery thread if the peer was already queued,
2127 * because its status changed.
2129 spin_unlock(&lp->lp_lock);
2130 lnet_net_lock(LNET_LOCK_EX);
2131 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2132 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2133 wake_up(&the_lnet.ln_dc_waitq);
2135 /* Drop refcount from lookup */
2136 lnet_peer_decref_locked(lp);
2137 lnet_net_unlock(LNET_LOCK_EX);
2141 * Clear the discovery error state, unless we're already discovering
2142 * this peer, in which case the error is current.
2144 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2146 spin_lock(&lp->lp_lock);
2147 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2148 lp->lp_dc_error = 0;
2149 spin_unlock(&lp->lp_lock);
2153 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2154 * dropped/retaken within this function. An lnet_peer_ni is passed in
2155 * because discovery could tear down an lnet_peer.
2158 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2161 struct lnet_peer *lp;
2166 lnet_net_unlock(cpt);
2167 lnet_net_lock(LNET_LOCK_EX);
2168 lp = lpni->lpni_peer_net->lpn_peer;
2169 lnet_peer_clear_discovery_error(lp);
2172 * We're willing to be interrupted. The lpni can become a
2173 * zombie if we race with DLC, so we must check for that.
2176 /* Keep lp alive when the lnet_net_lock is unlocked */
2177 lnet_peer_addref_locked(lp);
2178 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2179 if (signal_pending(current))
2181 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2184 * Don't repeat discovery if discovery is disabled. This is
2185 * done to ensure we can use discovery as a standard ping as
2186 * well for backwards compatibility with routers which do not
2187 * have discovery or have discovery disabled
2189 if (lnet_is_discovery_disabled(lp) && count > 0)
2191 if (lp->lp_dc_error)
2193 if (lnet_peer_is_uptodate(lp))
2195 lnet_peer_queue_for_discovery(lp);
2197 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2200 * If caller requested a non-blocking operation then
2201 * return immediately. Once discovery is complete any
2202 * pending messages that were stopped due to discovery
2203 * will be transmitted.
2208 lnet_net_unlock(LNET_LOCK_EX);
2210 finish_wait(&lp->lp_dc_waitq, &wait);
2211 lnet_net_lock(LNET_LOCK_EX);
2212 lnet_peer_decref_locked(lp);
2213 /* Peer may have changed */
2214 lp = lpni->lpni_peer_net->lpn_peer;
2216 finish_wait(&lp->lp_dc_waitq, &wait);
2218 lnet_net_unlock(LNET_LOCK_EX);
2220 lnet_peer_decref_locked(lp);
2222 * The peer may have changed, so re-check and rediscover if that turns
2223 * out to have been the case. The reference count on lp ensured that
2224 * even if it was unlinked from lpni the memory could not be recycled.
2225 * Thus the check below is sufficient to determine whether the peer
2226 * changed. If the peer changed, then lp must not be dereferenced.
2228 if (lp != lpni->lpni_peer_net->lpn_peer)
2231 if (signal_pending(current))
2233 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2235 else if (lp->lp_dc_error)
2236 rc = lp->lp_dc_error;
2238 CDEBUG(D_NET, "non-blocking discovery\n");
2239 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2242 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2243 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2244 libcfs_nid2str(lpni->lpni_nid), rc,
2245 (!block) ? "pending discovery" : "discovery complete");
2250 /* Handle an incoming ack for a push. */
2252 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2254 struct lnet_ping_buffer *pbuf;
2256 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2257 spin_lock(&lp->lp_lock);
2258 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2259 lp->lp_push_error = ev->status;
2261 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2263 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2264 spin_unlock(&lp->lp_lock);
2266 CDEBUG(D_NET, "peer %s ev->status %d\n",
2267 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2270 /* Handle a Reply message. This is the reply to a Ping message. */
2272 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2274 struct lnet_ping_buffer *pbuf;
2277 spin_lock(&lp->lp_lock);
2280 * If some kind of error happened the contents of message
2281 * cannot be used. Set PING_FAILED to trigger a retry.
2284 lp->lp_state |= LNET_PEER_PING_FAILED;
2285 lp->lp_ping_error = ev->status;
2286 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2288 libcfs_nid2str(lp->lp_primary_nid),
2289 libcfs_nid2str(ev->source.nid));
2293 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2294 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2295 lnet_swap_pinginfo(pbuf);
2298 * A reply with invalid or corrupted info. Set PING_FAILED to
2301 rc = lnet_ping_info_validate(&pbuf->pb_info);
2303 lp->lp_state |= LNET_PEER_PING_FAILED;
2304 lp->lp_ping_error = 0;
2305 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2306 libcfs_nid2str(lp->lp_primary_nid), rc);
2312 * Only enable the multi-rail feature on the peer if both sides of
2313 * the connection have discovery on
2315 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2316 CDEBUG(D_NET, "Peer %s has Multi-Rail feature enabled\n",
2317 libcfs_nid2str(lp->lp_primary_nid));
2318 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2320 CDEBUG(D_NET, "Peer %s has Multi-Rail feature disabled\n",
2321 libcfs_nid2str(lp->lp_primary_nid));
2322 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2326 * The peer may have discovery disabled at its end. Set
2327 * NO_DISCOVERY as appropriate.
2329 if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) &&
2330 !lnet_peer_discovery_disabled) {
2331 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2332 libcfs_nid2str(lp->lp_primary_nid));
2333 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2335 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2336 libcfs_nid2str(lp->lp_primary_nid));
2337 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2341 * Update the MULTI_RAIL flag based on the reply. If the peer
2342 * was configured with DLC then the setting should match what
2345 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2346 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2347 /* Everything's fine */
2348 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2349 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2350 libcfs_nid2str(lp->lp_primary_nid));
2353 * if discovery is disabled then we don't want to
2354 * update the state of the peer. All we'll do is
2355 * update the peer_nis which were reported back in
2359 if (!lnet_is_discovery_disabled_locked(lp)) {
2360 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2361 lnet_peer_clr_non_mr_pref_nids(lp);
2364 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2365 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2366 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2367 libcfs_nid2str(lp->lp_primary_nid));
2369 CERROR("Multi-Rail state vanished from %s\n",
2370 libcfs_nid2str(lp->lp_primary_nid));
2371 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2376 * Make sure we'll allocate the correct size ping buffer when
2379 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2380 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2383 * Check for truncation of the Reply. Clear PING_SENT and set
2384 * PING_FAILED to trigger a retry.
2386 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2387 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2388 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2389 lp->lp_state |= LNET_PEER_PING_FAILED;
2390 lp->lp_ping_error = 0;
2391 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2392 libcfs_nid2str(lp->lp_primary_nid),
2393 pbuf->pb_info.pi_nnis);
2398 * Check the sequence numbers in the reply. These are only
2399 * available if the reply came from a Multi-Rail peer.
2401 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2402 pbuf->pb_info.pi_nnis > 1 &&
2403 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2404 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2405 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2406 libcfs_nid2str(lp->lp_primary_nid),
2407 LNET_PING_BUFFER_SEQNO(pbuf),
2410 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2413 /* We're happy with the state of the data in the buffer. */
2414 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2415 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno, lp->lp_state);
2416 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2417 lnet_ping_buffer_decref(lp->lp_data);
2419 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2420 lnet_ping_buffer_addref(pbuf);
2423 lp->lp_state &= ~LNET_PEER_PING_SENT;
2424 spin_unlock(&lp->lp_lock);
2426 lnet_net_lock(LNET_LOCK_EX);
2428 * If this peer is a gateway, call the routing callback to
2429 * handle the ping reply
2431 if (lp->lp_rtr_refcount > 0)
2432 lnet_router_discovery_ping_reply(lp);
2433 lnet_net_unlock(LNET_LOCK_EX);
2437 * Send event handling. Only matters for error cases, where we clean
2438 * up state on the peer and peer_ni that would otherwise be updated in
2439 * the REPLY event handler for a successful Ping, and the ACK event
2440 * handler for a successful Push.
2443 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2450 spin_lock(&lp->lp_lock);
2451 if (ev->msg_type == LNET_MSG_GET) {
2452 lp->lp_state &= ~LNET_PEER_PING_SENT;
2453 lp->lp_state |= LNET_PEER_PING_FAILED;
2454 lp->lp_ping_error = ev->status;
2455 } else { /* ev->msg_type == LNET_MSG_PUT */
2456 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2457 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2458 lp->lp_push_error = ev->status;
2460 spin_unlock(&lp->lp_lock);
2461 rc = LNET_REDISCOVER_PEER;
2463 CDEBUG(D_NET, "%s Send to %s: %d\n",
2464 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2465 libcfs_nid2str(ev->target.nid), rc);
2470 * Unlink event handling. This event is only seen if a call to
2471 * LNetMDUnlink() caused the event to be unlinked. If this call was
2472 * made after the event was set up in LNetGet() or LNetPut() then we
2473 * assume the Ping or Push timed out.
2476 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2478 spin_lock(&lp->lp_lock);
2479 /* We've passed through LNetGet() */
2480 if (lp->lp_state & LNET_PEER_PING_SENT) {
2481 lp->lp_state &= ~LNET_PEER_PING_SENT;
2482 lp->lp_state |= LNET_PEER_PING_FAILED;
2483 lp->lp_ping_error = -ETIMEDOUT;
2484 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2485 libcfs_nid2str(lp->lp_primary_nid));
2487 /* We've passed through LNetPut() */
2488 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2489 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2490 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2491 lp->lp_push_error = -ETIMEDOUT;
2492 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2493 libcfs_nid2str(lp->lp_primary_nid));
2495 spin_unlock(&lp->lp_lock);
2499 * Event handler for the discovery EQ.
2501 * Called with lnet_res_lock(cpt) held. The cpt is the
2502 * lnet_cpt_of_cookie() of the md handle cookie.
2504 static void lnet_discovery_event_handler(struct lnet_event *event)
2506 struct lnet_peer *lp = event->md.user_ptr;
2507 struct lnet_ping_buffer *pbuf;
2510 /* discovery needs to take another look */
2511 rc = LNET_REDISCOVER_PEER;
2513 CDEBUG(D_NET, "Received event: %d\n", event->type);
2515 switch (event->type) {
2516 case LNET_EVENT_ACK:
2517 lnet_discovery_event_ack(lp, event);
2519 case LNET_EVENT_REPLY:
2520 lnet_discovery_event_reply(lp, event);
2522 case LNET_EVENT_SEND:
2523 /* Only send failure triggers a retry. */
2524 rc = lnet_discovery_event_send(lp, event);
2526 case LNET_EVENT_UNLINK:
2527 /* LNetMDUnlink() was called */
2528 lnet_discovery_event_unlink(lp, event);
2531 /* Invalid events. */
2534 lnet_net_lock(LNET_LOCK_EX);
2535 if (event->unlinked) {
2536 pbuf = LNET_PING_INFO_TO_BUFFER(event->md.start);
2537 lnet_ping_buffer_decref(pbuf);
2538 lnet_peer_decref_locked(lp);
2541 /* put peer back at end of request queue, if discovery not already
2543 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2544 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2545 wake_up(&the_lnet.ln_dc_waitq);
2547 lnet_net_unlock(LNET_LOCK_EX);
2551 * Build a peer from incoming data.
2553 * The NIDs in the incoming data are supposed to be structured as follows:
2556 * - other NIDs in same net
2557 * - NIDs in second net
2558 * - NIDs in third net
2560 * This due to the way the list of NIDs in the data is created.
2562 * Note that this function will mark the peer uptodate unless an
2563 * ENOMEM is encontered. All other errors are due to a conflict
2564 * between the DLC configuration and what discovery sees. We treat DLC
2565 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2566 * peer from becoming stuck in discovery.
2568 static int lnet_peer_merge_data(struct lnet_peer *lp,
2569 struct lnet_ping_buffer *pbuf)
2571 struct lnet_peer_ni *lpni;
2572 lnet_nid_t *curnis = NULL;
2573 struct lnet_ni_status *addnis = NULL;
2574 lnet_nid_t *delnis = NULL;
2584 flags = LNET_PEER_DISCOVERED;
2585 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2586 flags |= LNET_PEER_MULTI_RAIL;
2589 * Cache the routing feature for the peer; whether it is enabled
2590 * for disabled as reported by the remote peer.
2592 spin_lock(&lp->lp_lock);
2593 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
2594 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
2596 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
2597 spin_unlock(&lp->lp_lock);
2599 nnis = MAX(lp->lp_nnis, pbuf->pb_info.pi_nnis);
2600 LIBCFS_ALLOC(curnis, nnis * sizeof(*curnis));
2601 LIBCFS_ALLOC(addnis, nnis * sizeof(*addnis));
2602 LIBCFS_ALLOC(delnis, nnis * sizeof(*delnis));
2603 if (!curnis || !addnis || !delnis) {
2611 /* Construct the list of NIDs present in peer. */
2613 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2614 curnis[ncurnis++] = lpni->lpni_nid;
2617 * Check for NIDs in pbuf not present in curnis[].
2618 * The loop starts at 1 to skip the loopback NID.
2620 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2621 for (j = 0; j < ncurnis; j++)
2622 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2625 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
2628 * Check for NIDs in curnis[] not present in pbuf.
2629 * The nested loop starts at 1 to skip the loopback NID.
2631 * But never add the loopback NID to delnis[]: if it is
2632 * present in curnis[] then this peer is for this node.
2634 for (i = 0; i < ncurnis; i++) {
2635 if (LNET_NETTYP(LNET_NIDNET(curnis[i])) == LOLND)
2637 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
2638 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
2640 * update the information we cache for the
2641 * peer with the latest information we
2644 lpni = lnet_find_peer_ni_locked(curnis[i]);
2646 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
2647 lnet_peer_ni_decref_locked(lpni);
2652 if (j == pbuf->pb_info.pi_nnis)
2653 delnis[ndelnis++] = curnis[i];
2657 * If we get here and the discovery is disabled then we don't want
2658 * to add or delete any NIs. We just updated the ones we have some
2659 * information on, and call it a day
2662 if (lnet_is_discovery_disabled(lp))
2665 for (i = 0; i < naddnis; i++) {
2666 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
2668 CERROR("Error adding NID %s to peer %s: %d\n",
2669 libcfs_nid2str(addnis[i].ns_nid),
2670 libcfs_nid2str(lp->lp_primary_nid), rc);
2674 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
2676 lpni->lpni_ns_status = addnis[i].ns_status;
2677 lnet_peer_ni_decref_locked(lpni);
2681 for (i = 0; i < ndelnis; i++) {
2683 * for routers it's okay to delete the primary_nid because
2684 * the upper layers don't really rely on it. So if we're
2685 * being told that the router changed its primary_nid
2686 * then it's okay to delete it.
2688 if (lp->lp_rtr_refcount > 0)
2689 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
2690 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2692 CERROR("Error deleting NID %s from peer %s: %d\n",
2693 libcfs_nid2str(delnis[i]),
2694 libcfs_nid2str(lp->lp_primary_nid), rc);
2700 * Errors other than -ENOMEM are due to peers having been
2701 * configured with DLC. Ignore these because DLC overrides
2706 LIBCFS_FREE(curnis, nnis * sizeof(*curnis));
2707 LIBCFS_FREE(addnis, nnis * sizeof(*addnis));
2708 LIBCFS_FREE(delnis, nnis * sizeof(*delnis));
2709 lnet_ping_buffer_decref(pbuf);
2710 CDEBUG(D_NET, "peer %s (%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
2713 spin_lock(&lp->lp_lock);
2714 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2715 lp->lp_state |= LNET_PEER_FORCE_PING;
2716 spin_unlock(&lp->lp_lock);
2722 * The data in pbuf says lp is its primary peer, but the data was
2723 * received by a different peer. Try to update lp with the data.
2726 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2728 struct lnet_handle_md mdh;
2730 /* Queue lp for discovery, and force it on the request queue. */
2731 lnet_net_lock(LNET_LOCK_EX);
2732 if (lnet_peer_queue_for_discovery(lp))
2733 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2734 lnet_net_unlock(LNET_LOCK_EX);
2736 LNetInvalidateMDHandle(&mdh);
2739 * Decide whether we can move the peer to the DATA_PRESENT state.
2741 * We replace stale data for a multi-rail peer, repair PING_FAILED
2742 * status, and preempt FORCE_PING.
2744 * If after that we have DATA_PRESENT, we merge it into this peer.
2746 spin_lock(&lp->lp_lock);
2747 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2748 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2749 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2750 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2751 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2752 lnet_ping_buffer_decref(pbuf);
2757 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2758 lnet_ping_buffer_decref(lp->lp_data);
2760 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2762 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2763 mdh = lp->lp_ping_mdh;
2764 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2765 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2766 lp->lp_ping_error = 0;
2768 if (lp->lp_state & LNET_PEER_FORCE_PING)
2769 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2770 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2771 spin_unlock(&lp->lp_lock);
2773 if (!LNetMDHandleIsInvalid(mdh))
2777 return lnet_peer_merge_data(lp, pbuf);
2779 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2783 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
2787 for (i = 0; i < pinfo->pi_nnis; i++) {
2788 if (pinfo->pi_ni[i].ns_nid == nid)
2796 * Update a peer using the data received.
2798 static int lnet_peer_data_present(struct lnet_peer *lp)
2799 __must_hold(&lp->lp_lock)
2801 struct lnet_ping_buffer *pbuf;
2802 struct lnet_peer_ni *lpni;
2803 lnet_nid_t nid = LNET_NID_ANY;
2809 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2810 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2811 spin_unlock(&lp->lp_lock);
2814 * Modifications of peer structures are done while holding the
2815 * ln_api_mutex. A global lock is required because we may be
2816 * modifying multiple peer structures, and a mutex greatly
2817 * simplifies memory management.
2819 * The actual changes to the data structures must also protect
2820 * against concurrent lookups, for which the lnet_net_lock in
2821 * LNET_LOCK_EX mode is used.
2823 mutex_lock(&the_lnet.ln_api_mutex);
2824 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2830 * If this peer is not on the peer list then it is being torn
2831 * down, and our reference count may be all that is keeping it
2832 * alive. Don't do any work on it.
2834 if (list_empty(&lp->lp_peer_list))
2837 flags = LNET_PEER_DISCOVERED;
2838 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2839 flags |= LNET_PEER_MULTI_RAIL;
2842 * Check whether the primary NID in the message matches the
2843 * primary NID of the peer. If it does, update the peer, if
2844 * it it does not, check whether there is already a peer with
2845 * that primary NID. If no such peer exists, try to update
2846 * the primary NID of the current peer (allowed if it was
2847 * created due to message traffic) and complete the update.
2848 * If the peer did exist, hand off the data to it.
2850 * The peer for the loopback interface is a special case: this
2851 * is the peer for the local node, and we want to set its
2852 * primary NID to the correct value here. Moreover, this peer
2853 * can show up with only the loopback NID in the ping buffer.
2855 if (pbuf->pb_info.pi_nnis <= 1)
2857 nid = pbuf->pb_info.pi_ni[1].ns_nid;
2858 if (LNET_NETTYP(LNET_NIDNET(lp->lp_primary_nid)) == LOLND) {
2859 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2861 rc = lnet_peer_merge_data(lp, pbuf);
2863 * if the primary nid of the peer is present in the ping info returned
2864 * from the peer, but it's not the local primary peer we have
2865 * cached and discovery is disabled, then we don't want to update
2866 * our local peer info, by adding or removing NIDs, we just want
2867 * to update the status of the nids that we currently have
2868 * recorded in that peer.
2870 } else if (lp->lp_primary_nid == nid ||
2871 (lnet_is_nid_in_ping_info(lp->lp_primary_nid, &pbuf->pb_info) &&
2872 lnet_is_discovery_disabled(lp))) {
2873 rc = lnet_peer_merge_data(lp, pbuf);
2875 lpni = lnet_find_peer_ni_locked(nid);
2877 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2879 CERROR("Primary NID error %s versus %s: %d\n",
2880 libcfs_nid2str(lp->lp_primary_nid),
2881 libcfs_nid2str(nid), rc);
2883 rc = lnet_peer_merge_data(lp, pbuf);
2886 struct lnet_peer *new_lp;
2887 new_lp = lpni->lpni_peer_net->lpn_peer;
2889 * if lp has discovery/MR enabled that means new_lp
2890 * should have discovery/MR enabled as well, since
2891 * it's the same peer, which we're about to merge
2893 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2894 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2895 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
2896 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
2898 rc = lnet_peer_set_primary_data(new_lp, pbuf);
2899 lnet_consolidate_routes_locked(lp, new_lp);
2900 lnet_peer_ni_decref_locked(lpni);
2904 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc,
2906 mutex_unlock(&the_lnet.ln_api_mutex);
2908 spin_lock(&lp->lp_lock);
2909 /* Tell discovery to re-check the peer immediately. */
2911 rc = LNET_REDISCOVER_PEER;
2916 * A ping failed. Clear the PING_FAILED state and set the
2917 * FORCE_PING state, to ensure a retry even if discovery is
2918 * disabled. This avoids being left with incorrect state.
2920 static int lnet_peer_ping_failed(struct lnet_peer *lp)
2921 __must_hold(&lp->lp_lock)
2923 struct lnet_handle_md mdh;
2926 mdh = lp->lp_ping_mdh;
2927 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2928 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2929 lp->lp_state |= LNET_PEER_FORCE_PING;
2930 rc = lp->lp_ping_error;
2931 lp->lp_ping_error = 0;
2932 spin_unlock(&lp->lp_lock);
2934 if (!LNetMDHandleIsInvalid(mdh))
2937 CDEBUG(D_NET, "peer %s:%d\n",
2938 libcfs_nid2str(lp->lp_primary_nid), rc);
2940 spin_lock(&lp->lp_lock);
2941 return rc ? rc : LNET_REDISCOVER_PEER;
2945 * Select NID to send a Ping or Push to.
2947 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
2949 struct lnet_peer_ni *lpni;
2951 /* Look for a direct-connected NID for this peer. */
2953 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2954 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
2959 return lpni->lpni_nid;
2961 /* Look for a routed-connected NID for this peer. */
2963 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2964 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
2969 return lpni->lpni_nid;
2971 return LNET_NID_ANY;
2974 /* Active side of ping. */
2975 static int lnet_peer_send_ping(struct lnet_peer *lp)
2976 __must_hold(&lp->lp_lock)
2983 lp->lp_state |= LNET_PEER_PING_SENT;
2984 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2985 spin_unlock(&lp->lp_lock);
2987 cpt = lnet_net_lock_current();
2988 /* Refcount for MD. */
2989 lnet_peer_addref_locked(lp);
2990 pnid = lnet_peer_select_nid(lp);
2991 lnet_net_unlock(cpt);
2993 nnis = MAX(lp->lp_data_nnis, LNET_INTERFACES_MIN);
2995 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
2996 the_lnet.ln_dc_eqh, false);
2999 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3000 * refcount on the peer, otherwise LNetMDUnlink will be called
3001 * which will eventually do that.
3005 lnet_peer_decref_locked(lp);
3006 lnet_net_unlock(cpt);
3007 rc = -rc; /* change the rc to negative value */
3009 } else if (rc < 0) {
3013 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3015 spin_lock(&lp->lp_lock);
3019 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
3021 * The errors that get us here are considered hard errors and
3022 * cause Discovery to terminate. So we clear PING_SENT, but do
3023 * not set either PING_FAILED or FORCE_PING. In fact we need
3024 * to clear PING_FAILED, because the unlink event handler will
3025 * have set it if we called LNetMDUnlink() above.
3027 spin_lock(&lp->lp_lock);
3028 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3033 * This function exists because you cannot call LNetMDUnlink() from an
3036 static int lnet_peer_push_failed(struct lnet_peer *lp)
3037 __must_hold(&lp->lp_lock)
3039 struct lnet_handle_md mdh;
3042 mdh = lp->lp_push_mdh;
3043 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3044 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3045 rc = lp->lp_push_error;
3046 lp->lp_push_error = 0;
3047 spin_unlock(&lp->lp_lock);
3049 if (!LNetMDHandleIsInvalid(mdh))
3052 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3053 spin_lock(&lp->lp_lock);
3054 return rc ? rc : LNET_REDISCOVER_PEER;
3057 /* Active side of push. */
3058 static int lnet_peer_send_push(struct lnet_peer *lp)
3059 __must_hold(&lp->lp_lock)
3061 struct lnet_ping_buffer *pbuf;
3062 struct lnet_process_id id;
3067 /* Don't push to a non-multi-rail peer. */
3068 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3069 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3073 lp->lp_state |= LNET_PEER_PUSH_SENT;
3074 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3075 spin_unlock(&lp->lp_lock);
3077 cpt = lnet_net_lock_current();
3078 pbuf = the_lnet.ln_ping_target;
3079 lnet_ping_buffer_addref(pbuf);
3080 lnet_net_unlock(cpt);
3082 /* Push source MD */
3083 md.start = &pbuf->pb_info;
3084 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3085 md.threshold = 2; /* Put/Ack */
3088 md.eq_handle = the_lnet.ln_dc_eqh;
3091 rc = LNetMDBind(md, LNET_UNLINK, &lp->lp_push_mdh);
3093 lnet_ping_buffer_decref(pbuf);
3094 CERROR("Can't bind push source MD: %d\n", rc);
3097 cpt = lnet_net_lock_current();
3098 /* Refcount for MD. */
3099 lnet_peer_addref_locked(lp);
3100 id.pid = LNET_PID_LUSTRE;
3101 id.nid = lnet_peer_select_nid(lp);
3102 lnet_net_unlock(cpt);
3104 if (id.nid == LNET_NID_ANY) {
3109 rc = LNetPut(LNET_NID_ANY, lp->lp_push_mdh,
3110 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3111 LNET_PROTO_PING_MATCHBITS, 0, 0);
3116 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3118 spin_lock(&lp->lp_lock);
3122 LNetMDUnlink(lp->lp_push_mdh);
3123 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3125 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
3127 * The errors that get us here are considered hard errors and
3128 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3129 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3130 * because the unlink event handler will have set it if we
3131 * called LNetMDUnlink() above.
3133 spin_lock(&lp->lp_lock);
3134 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3139 * An unrecoverable error was encountered during discovery.
3140 * Set error status in peer and abort discovery.
3142 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3144 CDEBUG(D_NET, "Discovery error %s: %d\n",
3145 libcfs_nid2str(lp->lp_primary_nid), error);
3147 spin_lock(&lp->lp_lock);
3148 lp->lp_dc_error = error;
3149 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3150 lp->lp_state |= LNET_PEER_REDISCOVER;
3151 spin_unlock(&lp->lp_lock);
3155 * Mark the peer as discovered.
3157 static int lnet_peer_discovered(struct lnet_peer *lp)
3158 __must_hold(&lp->lp_lock)
3160 lp->lp_state |= LNET_PEER_DISCOVERED;
3161 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3162 LNET_PEER_REDISCOVER);
3164 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3171 * Discovering this peer is taking too long. Cancel any Ping or Push
3172 * that discovery is waiting on by unlinking the relevant MDs. The
3173 * lnet_discovery_event_handler() will proceed from here and complete
3176 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
3178 struct lnet_handle_md ping_mdh;
3179 struct lnet_handle_md push_mdh;
3181 LNetInvalidateMDHandle(&ping_mdh);
3182 LNetInvalidateMDHandle(&push_mdh);
3184 spin_lock(&lp->lp_lock);
3185 if (lp->lp_state & LNET_PEER_PING_SENT) {
3186 ping_mdh = lp->lp_ping_mdh;
3187 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3189 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
3190 push_mdh = lp->lp_push_mdh;
3191 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3193 spin_unlock(&lp->lp_lock);
3195 if (!LNetMDHandleIsInvalid(ping_mdh))
3196 LNetMDUnlink(ping_mdh);
3197 if (!LNetMDHandleIsInvalid(push_mdh))
3198 LNetMDUnlink(push_mdh);
3202 * Wait for work to be queued or some other change that must be
3203 * attended to. Returns non-zero if the discovery thread should shut
3206 static int lnet_peer_discovery_wait_for_work(void)
3213 cpt = lnet_net_lock_current();
3215 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3216 TASK_INTERRUPTIBLE);
3217 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3219 if (lnet_push_target_resize_needed())
3221 if (!list_empty(&the_lnet.ln_dc_request))
3223 if (!list_empty(&the_lnet.ln_msg_resend))
3225 lnet_net_unlock(cpt);
3228 * wakeup max every second to check if there are peers that
3229 * have been stuck on the working queue for greater than
3232 schedule_timeout(cfs_time_seconds(1));
3233 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3234 cpt = lnet_net_lock_current();
3236 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3238 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3241 lnet_net_unlock(cpt);
3243 CDEBUG(D_NET, "woken: %d\n", rc);
3249 * Messages that were pending on a destroyed peer will be put on a global
3250 * resend list. The message resend list will be checked by
3251 * the discovery thread when it wakes up, and will resend messages. These
3252 * messages can still be sendable in the case the lpni which was the initial
3253 * cause of the message re-queue was transfered to another peer.
3255 * It is possible that LNet could be shutdown while we're iterating
3256 * through the list. lnet_shudown_lndnets() will attempt to access the
3257 * resend list, but will have to wait until the spinlock is released, by
3258 * which time there shouldn't be any more messages on the resend list.
3259 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3260 * for the messages so they can be released. The other case is that
3261 * lnet_shudown_lndnets() can finalize all the messages before this
3262 * function can visit the resend list, in which case this function will be
3265 static void lnet_resend_msgs(void)
3267 struct lnet_msg *msg, *tmp;
3268 struct list_head resend;
3271 INIT_LIST_HEAD(&resend);
3273 spin_lock(&the_lnet.ln_msg_resend_lock);
3274 list_splice(&the_lnet.ln_msg_resend, &resend);
3275 spin_unlock(&the_lnet.ln_msg_resend_lock);
3277 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3278 list_del_init(&msg->msg_list);
3279 rc = lnet_send(msg->msg_src_nid_param, msg,
3280 msg->msg_rtr_nid_param);
3282 CNETERR("Error sending %s to %s: %d\n",
3283 lnet_msgtyp2str(msg->msg_type),
3284 libcfs_id2str(msg->msg_target), rc);
3285 lnet_finalize(msg, rc);
3290 /* The discovery thread. */
3291 static int lnet_peer_discovery(void *arg)
3293 struct lnet_peer *lp;
3296 wait_for_completion(&the_lnet.ln_started);
3298 CDEBUG(D_NET, "started\n");
3299 cfs_block_allsigs();
3302 if (lnet_peer_discovery_wait_for_work())
3307 if (lnet_push_target_resize_needed())
3308 lnet_push_target_resize();
3310 lnet_net_lock(LNET_LOCK_EX);
3311 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3315 * Process all incoming discovery work requests. When
3316 * discovery must wait on a peer to change state, it
3317 * is added to the tail of the ln_dc_working queue. A
3318 * timestamp keeps track of when the peer was added,
3319 * so we can time out discovery requests that take too
3322 while (!list_empty(&the_lnet.ln_dc_request)) {
3323 lp = list_first_entry(&the_lnet.ln_dc_request,
3324 struct lnet_peer, lp_dc_list);
3325 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3327 * set the time the peer was put on the dc_working
3328 * queue. It shouldn't remain on the queue
3329 * forever, in case the GET message (for ping)
3330 * doesn't get a REPLY or the PUT message (for
3331 * push) doesn't get an ACK.
3333 lp->lp_last_queued = ktime_get_real_seconds();
3334 lnet_net_unlock(LNET_LOCK_EX);
3337 * Select an action depending on the state of
3338 * the peer and whether discovery is disabled.
3339 * The check whether discovery is disabled is
3340 * done after the code that handles processing
3341 * for arrived data, cleanup for failures, and
3342 * forcing a Ping or Push.
3344 spin_lock(&lp->lp_lock);
3345 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3346 libcfs_nid2str(lp->lp_primary_nid), lp,
3348 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3349 rc = lnet_peer_data_present(lp);
3350 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3351 rc = lnet_peer_ping_failed(lp);
3352 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3353 rc = lnet_peer_push_failed(lp);
3354 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3355 rc = lnet_peer_send_ping(lp);
3356 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3357 rc = lnet_peer_send_push(lp);
3358 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3359 rc = lnet_peer_send_ping(lp);
3360 else if (lnet_peer_needs_push(lp))
3361 rc = lnet_peer_send_push(lp);
3363 rc = lnet_peer_discovered(lp);
3364 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3365 libcfs_nid2str(lp->lp_primary_nid), lp,
3367 spin_unlock(&lp->lp_lock);
3369 lnet_net_lock(LNET_LOCK_EX);
3370 if (rc == LNET_REDISCOVER_PEER) {
3371 list_move(&lp->lp_dc_list,
3372 &the_lnet.ln_dc_request);
3374 lnet_peer_discovery_error(lp, rc);
3376 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3377 lnet_peer_discovery_complete(lp);
3378 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3382 lnet_net_unlock(LNET_LOCK_EX);
3385 CDEBUG(D_NET, "stopping\n");
3387 * Clean up before telling lnet_peer_discovery_stop() that
3388 * we're done. Use wake_up() below to somewhat reduce the
3389 * size of the thundering herd if there are multiple threads
3390 * waiting on discovery of a single peer.
3393 /* Queue cleanup 1: stop all pending pings and pushes. */
3394 lnet_net_lock(LNET_LOCK_EX);
3395 while (!list_empty(&the_lnet.ln_dc_working)) {
3396 lp = list_first_entry(&the_lnet.ln_dc_working,
3397 struct lnet_peer, lp_dc_list);
3398 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3399 lnet_net_unlock(LNET_LOCK_EX);
3400 lnet_peer_cancel_discovery(lp);
3401 lnet_net_lock(LNET_LOCK_EX);
3403 lnet_net_unlock(LNET_LOCK_EX);
3405 /* Queue cleanup 2: wait for the expired queue to clear. */
3406 while (!list_empty(&the_lnet.ln_dc_expired))
3407 schedule_timeout(cfs_time_seconds(1));
3409 /* Queue cleanup 3: clear the request queue. */
3410 lnet_net_lock(LNET_LOCK_EX);
3411 while (!list_empty(&the_lnet.ln_dc_request)) {
3412 lp = list_first_entry(&the_lnet.ln_dc_request,
3413 struct lnet_peer, lp_dc_list);
3414 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3415 lnet_peer_discovery_complete(lp);
3417 lnet_net_unlock(LNET_LOCK_EX);
3419 LNetEQFree(the_lnet.ln_dc_eqh);
3420 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3422 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3423 wake_up(&the_lnet.ln_dc_waitq);
3425 CDEBUG(D_NET, "stopped\n");
3430 /* ln_api_mutex is held on entry. */
3431 int lnet_peer_discovery_start(void)
3433 struct task_struct *task;
3436 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3439 rc = LNetEQAlloc(0, lnet_discovery_event_handler, &the_lnet.ln_dc_eqh);
3441 CERROR("Can't allocate discovery EQ: %d\n", rc);
3445 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3446 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3449 CERROR("Can't start peer discovery thread: %d\n", rc);
3451 LNetEQFree(the_lnet.ln_dc_eqh);
3452 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3454 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3457 CDEBUG(D_NET, "discovery start: %d\n", rc);
3462 /* ln_api_mutex is held on entry. */
3463 void lnet_peer_discovery_stop(void)
3465 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3468 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3469 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3471 /* In the LNetNIInit() path we may be stopping discovery before it
3472 * entered its work loop
3474 if (!completion_done(&the_lnet.ln_started))
3475 complete(&the_lnet.ln_started);
3477 wake_up(&the_lnet.ln_dc_waitq);
3479 wait_event(the_lnet.ln_dc_waitq,
3480 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3482 LASSERT(list_empty(&the_lnet.ln_dc_request));
3483 LASSERT(list_empty(&the_lnet.ln_dc_working));
3484 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3486 CDEBUG(D_NET, "discovery stopped\n");
3492 lnet_debug_peer(lnet_nid_t nid)
3494 char *aliveness = "NA";
3495 struct lnet_peer_ni *lp;
3498 cpt = lnet_cpt_of_nid(nid, NULL);
3501 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3503 lnet_net_unlock(cpt);
3504 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3508 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3509 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3511 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3512 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
3513 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3514 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3515 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3517 lnet_peer_ni_decref_locked(lp);
3519 lnet_net_unlock(cpt);
3522 /* Gathering information for userspace. */
3524 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3525 char aliveness[LNET_MAX_STR_LEN],
3526 __u32 *cpt_iter, __u32 *refcount,
3527 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3528 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3529 __u32 *peer_tx_qnob)
3531 struct lnet_peer_table *peer_table;
3532 struct lnet_peer_ni *lp;
3537 /* get the number of CPTs */
3538 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3540 /* if the cpt number to be examined is >= the number of cpts in
3541 * the system then indicate that there are no more cpts to examin
3543 if (*cpt_iter >= lncpt)
3546 /* get the current table */
3547 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3548 /* if the ptable is NULL then there are no more cpts to examine */
3549 if (peer_table == NULL)
3552 lnet_net_lock(*cpt_iter);
3554 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3555 struct list_head *peers = &peer_table->pt_hash[j];
3557 list_for_each_entry(lp, peers, lpni_hashlist) {
3558 if (peer_index-- > 0)
3561 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3562 if (lnet_isrouter(lp) ||
3563 lnet_peer_aliveness_enabled(lp))
3564 snprintf(aliveness, LNET_MAX_STR_LEN,
3565 lnet_is_peer_ni_alive(lp) ? "up" : "down");
3567 *nid = lp->lpni_nid;
3568 *refcount = atomic_read(&lp->lpni_refcount);
3569 *ni_peer_tx_credits =
3570 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3571 *peer_tx_credits = lp->lpni_txcredits;
3572 *peer_rtr_credits = lp->lpni_rtrcredits;
3573 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3574 *peer_tx_qnob = lp->lpni_txqnob;
3580 lnet_net_unlock(*cpt_iter);
3584 return found ? 0 : -ENOENT;
3587 /* ln_api_mutex is held, which keeps the peer list stable */
3588 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3590 struct lnet_ioctl_element_stats *lpni_stats;
3591 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3592 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3593 struct lnet_peer_ni_credit_info *lpni_info;
3594 struct lnet_peer_ni *lpni;
3595 struct lnet_peer *lp;
3600 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3607 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3608 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3609 size *= lp->lp_nnis;
3610 if (size > cfg->prcfg_size) {
3611 cfg->prcfg_size = size;
3616 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3617 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3618 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3619 cfg->prcfg_count = lp->lp_nnis;
3620 cfg->prcfg_size = size;
3621 cfg->prcfg_state = lp->lp_state;
3623 /* Allocate helper buffers. */
3625 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3628 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3631 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3632 if (!lpni_msg_stats)
3633 goto out_free_stats;
3634 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3636 goto out_free_msg_stats;
3641 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3642 nid = lpni->lpni_nid;
3643 if (copy_to_user(bulk, &nid, sizeof(nid)))
3644 goto out_free_hstats;
3645 bulk += sizeof(nid);
3647 memset(lpni_info, 0, sizeof(*lpni_info));
3648 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3649 if (lnet_isrouter(lpni) ||
3650 lnet_peer_aliveness_enabled(lpni))
3651 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3652 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
3654 lpni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
3655 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3656 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3657 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3658 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3659 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3660 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3661 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3662 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3663 goto out_free_hstats;
3664 bulk += sizeof(*lpni_info);
3666 memset(lpni_stats, 0, sizeof(*lpni_stats));
3667 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3668 LNET_STATS_TYPE_SEND);
3669 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3670 LNET_STATS_TYPE_RECV);
3671 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3672 LNET_STATS_TYPE_DROP);
3673 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3674 goto out_free_hstats;
3675 bulk += sizeof(*lpni_stats);
3676 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3677 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3678 goto out_free_hstats;
3679 bulk += sizeof(*lpni_msg_stats);
3680 lpni_hstats->hlpni_network_timeout =
3681 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3682 lpni_hstats->hlpni_remote_dropped =
3683 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3684 lpni_hstats->hlpni_remote_timeout =
3685 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3686 lpni_hstats->hlpni_remote_error =
3687 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3688 lpni_hstats->hlpni_health_value =
3689 atomic_read(&lpni->lpni_healthv);
3690 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3691 goto out_free_hstats;
3692 bulk += sizeof(*lpni_hstats);
3697 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3699 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3701 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3703 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
3705 lnet_peer_decref_locked(lp);
3711 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni)
3713 /* the mt could've shutdown and cleaned up the queues */
3714 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
3717 if (list_empty(&lpni->lpni_recovery) &&
3718 atomic_read(&lpni->lpni_healthv) < LNET_MAX_HEALTH_VALUE) {
3719 CERROR("lpni %s added to recovery queue. Health = %d\n",
3720 libcfs_nid2str(lpni->lpni_nid),
3721 atomic_read(&lpni->lpni_healthv));
3722 list_add_tail(&lpni->lpni_recovery, &the_lnet.ln_mt_peerNIRecovq);
3723 lnet_peer_ni_addref_locked(lpni);
3727 /* Call with the ln_api_mutex held */
3729 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3731 struct lnet_peer_table *ptable;
3732 struct lnet_peer *lp;
3733 struct lnet_peer_net *lpn;
3734 struct lnet_peer_ni *lpni;
3738 if (the_lnet.ln_state != LNET_STATE_RUNNING)
3742 lnet_net_lock(LNET_LOCK_EX);
3743 lpni = lnet_find_peer_ni_locked(nid);
3745 lnet_net_unlock(LNET_LOCK_EX);
3748 atomic_set(&lpni->lpni_healthv, value);
3749 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3750 lnet_peer_ni_decref_locked(lpni);
3751 lnet_net_unlock(LNET_LOCK_EX);
3755 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3758 * Walk all the peers and reset the healhv for each one to the
3761 lnet_net_lock(LNET_LOCK_EX);
3762 for (cpt = 0; cpt < lncpt; cpt++) {
3763 ptable = the_lnet.ln_peer_tables[cpt];
3764 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
3765 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
3766 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
3768 atomic_set(&lpni->lpni_healthv, value);
3769 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3774 lnet_net_unlock(LNET_LOCK_EX);