4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
35 #define DEBUG_SUBSYSTEM S_LNET
37 #include <linux/sched.h>
38 #ifdef HAVE_SCHED_HEADERS
39 #include <linux/sched/signal.h>
41 #include <linux/uaccess.h>
43 #include <lnet/lib-lnet.h>
44 #include <uapi/linux/lnet/lnet-dlc.h>
46 /* Value indicating that recovery needs to re-check a peer immediately. */
47 #define LNET_REDISCOVER_PEER (1)
49 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp);
52 lnet_peer_remove_from_remote_list(struct lnet_peer_ni *lpni)
54 if (!list_empty(&lpni->lpni_on_remote_peer_ni_list)) {
55 list_del_init(&lpni->lpni_on_remote_peer_ni_list);
56 lnet_peer_ni_decref_locked(lpni);
61 lnet_peer_net_added(struct lnet_net *net)
63 struct lnet_peer_ni *lpni, *tmp;
65 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
66 lpni_on_remote_peer_ni_list) {
68 if (LNET_NIDNET(lpni->lpni_nid) == net->net_id) {
71 spin_lock(&lpni->lpni_lock);
72 lpni->lpni_txcredits =
73 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
74 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
75 lpni->lpni_rtrcredits =
76 lnet_peer_buffer_credits(lpni->lpni_net);
77 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
78 spin_unlock(&lpni->lpni_lock);
80 lnet_peer_remove_from_remote_list(lpni);
86 lnet_peer_tables_destroy(void)
88 struct lnet_peer_table *ptable;
89 struct list_head *hash;
93 if (!the_lnet.ln_peer_tables)
96 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
97 hash = ptable->pt_hash;
98 if (!hash) /* not intialized */
101 LASSERT(list_empty(&ptable->pt_zombie_list));
103 ptable->pt_hash = NULL;
104 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
105 LASSERT(list_empty(&hash[j]));
107 LIBCFS_FREE(hash, LNET_PEER_HASH_SIZE * sizeof(*hash));
110 cfs_percpt_free(the_lnet.ln_peer_tables);
111 the_lnet.ln_peer_tables = NULL;
115 lnet_peer_tables_create(void)
117 struct lnet_peer_table *ptable;
118 struct list_head *hash;
122 the_lnet.ln_peer_tables = cfs_percpt_alloc(lnet_cpt_table(),
124 if (the_lnet.ln_peer_tables == NULL) {
125 CERROR("Failed to allocate cpu-partition peer tables\n");
129 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
130 LIBCFS_CPT_ALLOC(hash, lnet_cpt_table(), i,
131 LNET_PEER_HASH_SIZE * sizeof(*hash));
133 CERROR("Failed to create peer hash table\n");
134 lnet_peer_tables_destroy();
138 spin_lock_init(&ptable->pt_zombie_lock);
139 INIT_LIST_HEAD(&ptable->pt_zombie_list);
141 INIT_LIST_HEAD(&ptable->pt_peer_list);
143 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
144 INIT_LIST_HEAD(&hash[j]);
145 ptable->pt_hash = hash; /* sign of initialization */
151 static struct lnet_peer_ni *
152 lnet_peer_ni_alloc(lnet_nid_t nid)
154 struct lnet_peer_ni *lpni;
155 struct lnet_net *net;
158 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
160 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt, sizeof(*lpni));
164 INIT_LIST_HEAD(&lpni->lpni_txq);
165 INIT_LIST_HEAD(&lpni->lpni_hashlist);
166 INIT_LIST_HEAD(&lpni->lpni_peer_nis);
167 INIT_LIST_HEAD(&lpni->lpni_recovery);
168 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
169 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
171 spin_lock_init(&lpni->lpni_lock);
173 if (lnet_peers_start_down())
174 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
176 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
177 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
178 lpni->lpni_nid = nid;
179 lpni->lpni_cpt = cpt;
180 atomic_set(&lpni->lpni_healthv, LNET_MAX_HEALTH_VALUE);
182 net = lnet_get_net_locked(LNET_NIDNET(nid));
183 lpni->lpni_net = net;
185 lpni->lpni_txcredits = net->net_tunables.lct_peer_tx_credits;
186 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
187 lpni->lpni_rtrcredits = lnet_peer_buffer_credits(net);
188 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
191 * This peer_ni is not on a local network, so we
192 * cannot add the credits here. In case the net is
193 * added later, add the peer_ni to the remote peer ni
194 * list so it can be easily found and revisited.
196 /* FIXME: per-net implementation instead? */
197 atomic_inc(&lpni->lpni_refcount);
198 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
199 &the_lnet.ln_remote_peer_ni_list);
202 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
207 static struct lnet_peer_net *
208 lnet_peer_net_alloc(__u32 net_id)
210 struct lnet_peer_net *lpn;
212 LIBCFS_CPT_ALLOC(lpn, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lpn));
216 INIT_LIST_HEAD(&lpn->lpn_peer_nets);
217 INIT_LIST_HEAD(&lpn->lpn_peer_nis);
218 lpn->lpn_net_id = net_id;
220 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
226 lnet_destroy_peer_net_locked(struct lnet_peer_net *lpn)
228 struct lnet_peer *lp;
230 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
232 LASSERT(atomic_read(&lpn->lpn_refcount) == 0);
233 LASSERT(list_empty(&lpn->lpn_peer_nis));
234 LASSERT(list_empty(&lpn->lpn_peer_nets));
236 lpn->lpn_peer = NULL;
237 LIBCFS_FREE(lpn, sizeof(*lpn));
239 lnet_peer_decref_locked(lp);
242 static struct lnet_peer *
243 lnet_peer_alloc(lnet_nid_t nid)
245 struct lnet_peer *lp;
247 LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lp));
251 INIT_LIST_HEAD(&lp->lp_rtrq);
252 INIT_LIST_HEAD(&lp->lp_routes);
253 INIT_LIST_HEAD(&lp->lp_peer_list);
254 INIT_LIST_HEAD(&lp->lp_peer_nets);
255 INIT_LIST_HEAD(&lp->lp_dc_list);
256 INIT_LIST_HEAD(&lp->lp_dc_pendq);
257 INIT_LIST_HEAD(&lp->lp_rtr_list);
258 init_waitqueue_head(&lp->lp_dc_waitq);
259 spin_lock_init(&lp->lp_lock);
260 lp->lp_primary_nid = nid;
261 if (lnet_peers_start_down())
262 lp->lp_alive = false;
267 * all peers created on a router should have health on
268 * if it's not already on.
270 if (the_lnet.ln_routing && !lnet_health_sensitivity)
271 lp->lp_health_sensitivity = 1;
274 * Turn off discovery for loopback peer. If you're creating a peer
275 * for the loopback interface then that was initiated when we
276 * attempted to send a message over the loopback. There is no need
277 * to ever use a different interface when sending messages to
280 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
281 lp->lp_state = LNET_PEER_NO_DISCOVERY;
282 lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
284 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
290 lnet_destroy_peer_locked(struct lnet_peer *lp)
292 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
294 LASSERT(atomic_read(&lp->lp_refcount) == 0);
295 LASSERT(lp->lp_rtr_refcount == 0);
296 LASSERT(list_empty(&lp->lp_peer_nets));
297 LASSERT(list_empty(&lp->lp_peer_list));
298 LASSERT(list_empty(&lp->lp_dc_list));
301 lnet_ping_buffer_decref(lp->lp_data);
304 * if there are messages still on the pending queue, then make
305 * sure to queue them on the ln_msg_resend list so they can be
306 * resent at a later point if the discovery thread is still
308 * If the discovery thread has stopped, then the wakeup will be a
309 * no-op, and it is expected the lnet_shutdown_lndnets() will
310 * eventually be called, which will traverse this list and
311 * finalize the messages on the list.
312 * We can not resend them now because we're holding the cpt lock.
313 * Releasing the lock can cause an inconsistent state
315 spin_lock(&the_lnet.ln_msg_resend_lock);
316 spin_lock(&lp->lp_lock);
317 list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
318 spin_unlock(&lp->lp_lock);
319 spin_unlock(&the_lnet.ln_msg_resend_lock);
320 wake_up(&the_lnet.ln_dc_waitq);
322 LIBCFS_FREE(lp, sizeof(*lp));
326 * Detach a peer_ni from its peer_net. If this was the last peer_ni on
327 * that peer_net, detach the peer_net from the peer.
329 * Call with lnet_net_lock/EX held
332 lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
334 struct lnet_peer_table *ptable;
335 struct lnet_peer_net *lpn;
336 struct lnet_peer *lp;
339 * Belts and suspenders: gracefully handle teardown of a
340 * partially connected peer_ni.
342 lpn = lpni->lpni_peer_net;
344 list_del_init(&lpni->lpni_peer_nis);
346 * If there are no lpni's left, we detach lpn from
347 * lp_peer_nets, so it cannot be found anymore.
349 if (list_empty(&lpn->lpn_peer_nis))
350 list_del_init(&lpn->lpn_peer_nets);
352 /* Update peer NID count. */
357 * If there are no more peer nets, make the peer unfindable
358 * via the peer_tables.
360 * Otherwise, if the peer is DISCOVERED, tell discovery to
361 * take another look at it. This is a no-op if discovery for
362 * this peer did the detaching.
364 if (list_empty(&lp->lp_peer_nets)) {
365 list_del_init(&lp->lp_peer_list);
366 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
368 } else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
369 /* Discovery isn't running, nothing to do here. */
370 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
371 lnet_peer_queue_for_discovery(lp);
372 wake_up(&the_lnet.ln_dc_waitq);
374 CDEBUG(D_NET, "peer %s NID %s\n",
375 libcfs_nid2str(lp->lp_primary_nid),
376 libcfs_nid2str(lpni->lpni_nid));
379 /* called with lnet_net_lock LNET_LOCK_EX held */
381 lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni, bool force)
383 struct lnet_peer_table *ptable = NULL;
385 /* don't remove a peer_ni if it's also a gateway */
386 if (lnet_isrouter(lpni) && !force) {
387 CERROR("Peer NI %s is a gateway. Can not delete it\n",
388 libcfs_nid2str(lpni->lpni_nid));
392 lnet_peer_remove_from_remote_list(lpni);
394 /* remove peer ni from the hash list. */
395 list_del_init(&lpni->lpni_hashlist);
398 * indicate the peer is being deleted so the monitor thread can
399 * remove it from the recovery queue.
401 spin_lock(&lpni->lpni_lock);
402 lpni->lpni_state |= LNET_PEER_NI_DELETING;
403 spin_unlock(&lpni->lpni_lock);
405 /* decrement the ref count on the peer table */
406 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
409 * The peer_ni can no longer be found with a lookup. But there
410 * can be current users, so keep track of it on the zombie
411 * list until the reference count has gone to zero.
413 * The last reference may be lost in a place where the
414 * lnet_net_lock locks only a single cpt, and that cpt may not
415 * be lpni->lpni_cpt. So the zombie list of lnet_peer_table
418 spin_lock(&ptable->pt_zombie_lock);
419 list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
420 ptable->pt_zombies++;
421 spin_unlock(&ptable->pt_zombie_lock);
423 /* no need to keep this peer_ni on the hierarchy anymore */
424 lnet_peer_detach_peer_ni_locked(lpni);
426 /* remove hashlist reference on peer_ni */
427 lnet_peer_ni_decref_locked(lpni);
432 void lnet_peer_uninit(void)
434 struct lnet_peer_ni *lpni, *tmp;
436 lnet_net_lock(LNET_LOCK_EX);
438 /* remove all peer_nis from the remote peer and the hash list */
439 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
440 lpni_on_remote_peer_ni_list)
441 lnet_peer_ni_del_locked(lpni, false);
443 lnet_peer_tables_destroy();
445 lnet_net_unlock(LNET_LOCK_EX);
449 lnet_peer_del_locked(struct lnet_peer *peer)
451 struct lnet_peer_ni *lpni = NULL, *lpni2;
454 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(peer->lp_primary_nid));
456 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
457 while (lpni != NULL) {
458 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
459 rc = lnet_peer_ni_del_locked(lpni, false);
469 lnet_peer_del(struct lnet_peer *peer)
471 lnet_net_lock(LNET_LOCK_EX);
472 lnet_peer_del_locked(peer);
473 lnet_net_unlock(LNET_LOCK_EX);
479 * Delete a NID from a peer. Call with ln_api_mutex held.
482 * -EPERM: Non-DLC deletion from DLC-configured peer.
483 * -ENOENT: No lnet_peer_ni corresponding to the nid.
484 * -ECHILD: The lnet_peer_ni isn't connected to the peer.
485 * -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
488 lnet_peer_del_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
490 struct lnet_peer_ni *lpni;
491 lnet_nid_t primary_nid = lp->lp_primary_nid;
493 bool force = (flags & LNET_PEER_RTR_NI_FORCE_DEL) ? true : false;
495 if (!(flags & LNET_PEER_CONFIGURED)) {
496 if (lp->lp_state & LNET_PEER_CONFIGURED) {
501 lpni = lnet_find_peer_ni_locked(nid);
506 lnet_peer_ni_decref_locked(lpni);
507 if (lp != lpni->lpni_peer_net->lpn_peer) {
513 * This function only allows deletion of the primary NID if it
516 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && !force) {
521 lnet_net_lock(LNET_LOCK_EX);
523 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && force) {
524 struct lnet_peer_ni *lpni2;
525 /* assign the next peer_ni to be the primary */
526 lpni2 = lnet_get_next_peer_ni_locked(lp, NULL, lpni);
528 lp->lp_primary_nid = lpni->lpni_nid;
530 rc = lnet_peer_ni_del_locked(lpni, force);
532 lnet_net_unlock(LNET_LOCK_EX);
535 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
536 libcfs_nid2str(primary_nid), libcfs_nid2str(nid), flags, rc);
542 lnet_peer_table_cleanup_locked(struct lnet_net *net,
543 struct lnet_peer_table *ptable)
546 struct lnet_peer_ni *next;
547 struct lnet_peer_ni *lpni;
548 struct lnet_peer *peer;
550 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
551 list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
553 if (net != NULL && net != lpni->lpni_net)
556 peer = lpni->lpni_peer_net->lpn_peer;
557 if (peer->lp_primary_nid != lpni->lpni_nid) {
558 lnet_peer_ni_del_locked(lpni, false);
562 * Removing the primary NID implies removing
563 * the entire peer. Advance next beyond any
564 * peer_ni that belongs to the same peer.
566 list_for_each_entry_from(next, &ptable->pt_hash[i],
568 if (next->lpni_peer_net->lpn_peer != peer)
571 lnet_peer_del_locked(peer);
577 lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
581 spin_lock(&ptable->pt_zombie_lock);
582 while (ptable->pt_zombies) {
583 spin_unlock(&ptable->pt_zombie_lock);
585 if (is_power_of_2(i)) {
587 "Waiting for %d zombies on peer table\n",
590 set_current_state(TASK_UNINTERRUPTIBLE);
591 schedule_timeout(cfs_time_seconds(1) >> 1);
592 spin_lock(&ptable->pt_zombie_lock);
594 spin_unlock(&ptable->pt_zombie_lock);
598 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
599 struct lnet_peer_table *ptable)
601 struct lnet_peer_ni *lp;
602 struct lnet_peer_ni *tmp;
606 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
607 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
609 if (net != lp->lpni_net)
612 if (!lnet_isrouter(lp))
615 gw_nid = lp->lpni_peer_net->lpn_peer->lp_primary_nid;
617 lnet_net_unlock(LNET_LOCK_EX);
618 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), gw_nid);
619 lnet_net_lock(LNET_LOCK_EX);
625 lnet_peer_tables_cleanup(struct lnet_net *net)
628 struct lnet_peer_table *ptable;
630 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
631 /* If just deleting the peers for a NI, get rid of any routes these
632 * peers are gateways for. */
633 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
634 lnet_net_lock(LNET_LOCK_EX);
635 lnet_peer_table_del_rtrs_locked(net, ptable);
636 lnet_net_unlock(LNET_LOCK_EX);
639 /* Start the cleanup process */
640 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
641 lnet_net_lock(LNET_LOCK_EX);
642 lnet_peer_table_cleanup_locked(net, ptable);
643 lnet_net_unlock(LNET_LOCK_EX);
646 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
647 lnet_peer_ni_finalize_wait(ptable);
650 static struct lnet_peer_ni *
651 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
653 struct list_head *peers;
654 struct lnet_peer_ni *lp;
656 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
658 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
659 list_for_each_entry(lp, peers, lpni_hashlist) {
660 if (lp->lpni_nid == nid) {
661 lnet_peer_ni_addref_locked(lp);
669 struct lnet_peer_ni *
670 lnet_find_peer_ni_locked(lnet_nid_t nid)
672 struct lnet_peer_ni *lpni;
673 struct lnet_peer_table *ptable;
676 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
678 ptable = the_lnet.ln_peer_tables[cpt];
679 lpni = lnet_get_peer_ni_locked(ptable, nid);
684 struct lnet_peer_ni *
685 lnet_peer_get_ni_locked(struct lnet_peer *lp, lnet_nid_t nid)
687 struct lnet_peer_net *lpn;
688 struct lnet_peer_ni *lpni;
690 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
694 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
695 if (lpni->lpni_nid == nid)
703 lnet_find_peer(lnet_nid_t nid)
705 struct lnet_peer_ni *lpni;
706 struct lnet_peer *lp = NULL;
709 cpt = lnet_net_lock_current();
710 lpni = lnet_find_peer_ni_locked(nid);
712 lp = lpni->lpni_peer_net->lpn_peer;
713 lnet_peer_addref_locked(lp);
714 lnet_peer_ni_decref_locked(lpni);
716 lnet_net_unlock(cpt);
721 struct lnet_peer_net *
722 lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
724 struct lnet_peer_net *net;
727 /* no net id provided return the first net */
728 net = list_first_entry_or_null(&lp->lp_peer_nets,
729 struct lnet_peer_net,
735 /* find the net after the one provided */
736 list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
737 if (net->lpn_net_id == prev_lpn_id) {
739 * if we reached the end of the list loop to the
742 if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
743 return list_first_entry_or_null(&lp->lp_peer_nets,
744 struct lnet_peer_net,
747 return list_next_entry(net, lpn_peer_nets);
754 struct lnet_peer_ni *
755 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
756 struct lnet_peer_net *peer_net,
757 struct lnet_peer_ni *prev)
759 struct lnet_peer_ni *lpni;
760 struct lnet_peer_net *net = peer_net;
764 if (list_empty(&peer->lp_peer_nets))
767 net = list_entry(peer->lp_peer_nets.next,
768 struct lnet_peer_net,
771 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
777 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
779 * if you reached the end of the peer ni list and the peer
780 * net is specified then there are no more peer nis in that
787 * we reached the end of this net ni list. move to the
790 if (prev->lpni_peer_net->lpn_peer_nets.next ==
792 /* no more nets and no more NIs. */
795 /* get the next net */
796 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
797 struct lnet_peer_net,
799 /* get the ni on it */
800 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
806 /* there are more nis left */
807 lpni = list_entry(prev->lpni_peer_nis.next,
808 struct lnet_peer_ni, lpni_peer_nis);
813 /* Call with the ln_api_mutex held */
814 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
816 struct lnet_process_id id;
817 struct lnet_peer_table *ptable;
818 struct lnet_peer *lp;
827 if (the_lnet.ln_state != LNET_STATE_RUNNING)
830 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
833 * Count the number of peers, and return E2BIG if the buffer
834 * is too small. We'll also return the desired size.
837 for (cpt = 0; cpt < lncpt; cpt++) {
838 ptable = the_lnet.ln_peer_tables[cpt];
839 count += ptable->pt_peers;
841 size = count * sizeof(*ids);
846 * Walk the peer lists and copy out the primary nids.
847 * This is safe because the peer lists are only modified
848 * while the ln_api_mutex is held. So we don't need to
849 * hold the lnet_net_lock as well, and can therefore
850 * directly call copy_to_user().
853 memset(&id, 0, sizeof(id));
854 id.pid = LNET_PID_LUSTRE;
856 for (cpt = 0; cpt < lncpt; cpt++) {
857 ptable = the_lnet.ln_peer_tables[cpt];
858 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
861 id.nid = lp->lp_primary_nid;
862 if (copy_to_user(&ids[i], &id, sizeof(id)))
875 * Start pushes to peers that need to be updated for a configuration
876 * change on this node.
879 lnet_push_update_to_peers(int force)
881 struct lnet_peer_table *ptable;
882 struct lnet_peer *lp;
886 lnet_net_lock(LNET_LOCK_EX);
887 if (lnet_peer_discovery_disabled)
889 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
890 for (cpt = 0; cpt < lncpt; cpt++) {
891 ptable = the_lnet.ln_peer_tables[cpt];
892 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
894 spin_lock(&lp->lp_lock);
895 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
896 lp->lp_state |= LNET_PEER_FORCE_PUSH;
897 spin_unlock(&lp->lp_lock);
899 if (lnet_peer_needs_push(lp))
900 lnet_peer_queue_for_discovery(lp);
903 lnet_net_unlock(LNET_LOCK_EX);
904 wake_up(&the_lnet.ln_dc_waitq);
908 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
909 * this is a preferred point-to-point path. Call with lnet_net_lock in
913 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
917 if (lpni->lpni_pref_nnids == 0)
919 if (lpni->lpni_pref_nnids == 1)
920 return lpni->lpni_pref.nid == nid;
921 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
922 if (lpni->lpni_pref.nids[i] == nid)
929 * Set a single ni as preferred, provided no preferred ni is already
930 * defined. Only to be used for non-multi-rail peer_ni.
933 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
937 spin_lock(&lpni->lpni_lock);
938 if (nid == LNET_NID_ANY) {
940 } else if (lpni->lpni_pref_nnids > 0) {
942 } else if (lpni->lpni_pref_nnids == 0) {
943 lpni->lpni_pref.nid = nid;
944 lpni->lpni_pref_nnids = 1;
945 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
947 spin_unlock(&lpni->lpni_lock);
949 CDEBUG(D_NET, "peer %s nid %s: %d\n",
950 libcfs_nid2str(lpni->lpni_nid), libcfs_nid2str(nid), rc);
955 * Clear the preferred NID from a non-multi-rail peer_ni, provided
956 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
959 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
963 spin_lock(&lpni->lpni_lock);
964 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
965 lpni->lpni_pref_nnids = 0;
966 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
967 } else if (lpni->lpni_pref_nnids == 0) {
972 spin_unlock(&lpni->lpni_lock);
974 CDEBUG(D_NET, "peer %s: %d\n",
975 libcfs_nid2str(lpni->lpni_nid), rc);
980 * Clear the preferred NIDs from a non-multi-rail peer.
983 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
985 struct lnet_peer_ni *lpni = NULL;
987 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
988 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
992 lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
994 lnet_nid_t *nids = NULL;
995 lnet_nid_t *oldnids = NULL;
996 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1001 if (nid == LNET_NID_ANY) {
1006 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
1011 /* A non-MR node may have only one preferred NI per peer_ni */
1012 if (lpni->lpni_pref_nnids > 0) {
1013 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1019 if (lpni->lpni_pref_nnids != 0) {
1020 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1021 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1026 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
1027 if (lpni->lpni_pref.nids[i] == nid) {
1028 LIBCFS_FREE(nids, size);
1032 nids[i] = lpni->lpni_pref.nids[i];
1037 lnet_net_lock(LNET_LOCK_EX);
1038 spin_lock(&lpni->lpni_lock);
1039 if (lpni->lpni_pref_nnids == 0) {
1040 lpni->lpni_pref.nid = nid;
1042 oldnids = lpni->lpni_pref.nids;
1043 lpni->lpni_pref.nids = nids;
1045 lpni->lpni_pref_nnids++;
1046 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1047 spin_unlock(&lpni->lpni_lock);
1048 lnet_net_unlock(LNET_LOCK_EX);
1051 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1052 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
1055 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
1056 spin_lock(&lpni->lpni_lock);
1057 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1058 spin_unlock(&lpni->lpni_lock);
1060 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1061 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1066 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1068 lnet_nid_t *nids = NULL;
1069 lnet_nid_t *oldnids = NULL;
1070 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1075 if (lpni->lpni_pref_nnids == 0) {
1080 if (lpni->lpni_pref_nnids == 1) {
1081 if (lpni->lpni_pref.nid != nid) {
1085 } else if (lpni->lpni_pref_nnids == 2) {
1086 if (lpni->lpni_pref.nids[0] != nid &&
1087 lpni->lpni_pref.nids[1] != nid) {
1092 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1093 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1098 for (i = 0, j = 0; i < lpni->lpni_pref_nnids; i++) {
1099 if (lpni->lpni_pref.nids[i] != nid)
1101 nids[j++] = lpni->lpni_pref.nids[i];
1103 /* Check if we actually removed a nid. */
1104 if (j == lpni->lpni_pref_nnids) {
1105 LIBCFS_FREE(nids, size);
1111 lnet_net_lock(LNET_LOCK_EX);
1112 spin_lock(&lpni->lpni_lock);
1113 if (lpni->lpni_pref_nnids == 1) {
1114 lpni->lpni_pref.nid = LNET_NID_ANY;
1115 } else if (lpni->lpni_pref_nnids == 2) {
1116 oldnids = lpni->lpni_pref.nids;
1117 if (oldnids[0] == nid)
1118 lpni->lpni_pref.nid = oldnids[1];
1120 lpni->lpni_pref.nid = oldnids[2];
1122 oldnids = lpni->lpni_pref.nids;
1123 lpni->lpni_pref.nids = nids;
1125 lpni->lpni_pref_nnids--;
1126 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1127 spin_unlock(&lpni->lpni_lock);
1128 lnet_net_unlock(LNET_LOCK_EX);
1131 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1132 LIBCFS_FREE(oldnids, sizeof(*oldnids) * size);
1135 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1136 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1141 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1143 struct lnet_peer_ni *lpni;
1144 lnet_nid_t primary_nid = nid;
1146 lpni = lnet_find_peer_ni_locked(nid);
1148 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
1149 lnet_peer_ni_decref_locked(lpni);
1156 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1157 __must_hold(&lp->lp_lock)
1159 if (lnet_peer_discovery_disabled)
1162 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1163 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1174 lnet_is_discovery_disabled(struct lnet_peer *lp)
1178 spin_lock(&lp->lp_lock);
1179 rc = lnet_is_discovery_disabled_locked(lp);
1180 spin_unlock(&lp->lp_lock);
1186 LNetPrimaryNID(lnet_nid_t nid)
1188 struct lnet_peer *lp;
1189 struct lnet_peer_ni *lpni;
1190 lnet_nid_t primary_nid = nid;
1194 cpt = lnet_net_lock_current();
1195 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1200 lp = lpni->lpni_peer_net->lpn_peer;
1202 while (!lnet_peer_is_uptodate(lp)) {
1203 rc = lnet_discover_peer_locked(lpni, cpt, true);
1206 lp = lpni->lpni_peer_net->lpn_peer;
1208 /* Only try once if discovery is disabled */
1209 if (lnet_is_discovery_disabled(lp))
1212 primary_nid = lp->lp_primary_nid;
1214 lnet_peer_ni_decref_locked(lpni);
1216 lnet_net_unlock(cpt);
1218 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1219 libcfs_nid2str(primary_nid), rc);
1222 EXPORT_SYMBOL(LNetPrimaryNID);
1224 struct lnet_peer_net *
1225 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1227 struct lnet_peer_net *peer_net;
1228 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1229 if (peer_net->lpn_net_id == net_id)
1236 * Attach a peer_ni to a peer_net and peer. This function assumes
1237 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1238 * may be attached to a different peer, in which case it will be
1239 * properly detached first. The whole operation is done atomically.
1241 * Always returns 0. This is the last function called from functions
1242 * that do return an int, so returning 0 here allows the compiler to
1246 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1247 struct lnet_peer_net *lpn,
1248 struct lnet_peer_ni *lpni,
1251 struct lnet_peer_table *ptable;
1253 /* Install the new peer_ni */
1254 lnet_net_lock(LNET_LOCK_EX);
1255 /* Add peer_ni to global peer table hash, if necessary. */
1256 if (list_empty(&lpni->lpni_hashlist)) {
1257 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1259 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1260 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1261 ptable->pt_version++;
1262 /* This is the 1st refcount on lpni. */
1263 atomic_inc(&lpni->lpni_refcount);
1266 /* Detach the peer_ni from an existing peer, if necessary. */
1267 if (lpni->lpni_peer_net) {
1268 LASSERT(lpni->lpni_peer_net != lpn);
1269 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1270 lnet_peer_detach_peer_ni_locked(lpni);
1271 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1272 lpni->lpni_peer_net = NULL;
1275 /* Add peer_ni to peer_net */
1276 lpni->lpni_peer_net = lpn;
1277 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1278 lnet_peer_net_addref_locked(lpn);
1280 /* Add peer_net to peer */
1281 if (!lpn->lpn_peer) {
1283 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1284 lnet_peer_addref_locked(lp);
1287 /* Add peer to global peer list, if necessary */
1288 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1289 if (list_empty(&lp->lp_peer_list)) {
1290 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1295 /* Update peer state */
1296 spin_lock(&lp->lp_lock);
1297 if (flags & LNET_PEER_CONFIGURED) {
1298 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1299 lp->lp_state |= LNET_PEER_CONFIGURED;
1301 if (flags & LNET_PEER_MULTI_RAIL) {
1302 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1303 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1304 lnet_peer_clr_non_mr_pref_nids(lp);
1307 spin_unlock(&lp->lp_lock);
1310 lnet_net_unlock(LNET_LOCK_EX);
1312 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1313 libcfs_nid2str(lp->lp_primary_nid),
1314 libcfs_nid2str(lpni->lpni_nid), flags);
1320 * Create a new peer, with nid as its primary nid.
1322 * Call with the lnet_api_mutex held.
1325 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1327 struct lnet_peer *lp;
1328 struct lnet_peer_net *lpn;
1329 struct lnet_peer_ni *lpni;
1332 LASSERT(nid != LNET_NID_ANY);
1335 * No need for the lnet_net_lock here, because the
1336 * lnet_api_mutex is held.
1338 lpni = lnet_find_peer_ni_locked(nid);
1340 /* A peer with this NID already exists. */
1341 lp = lpni->lpni_peer_net->lpn_peer;
1342 lnet_peer_ni_decref_locked(lpni);
1344 * This is an error if the peer was configured and the
1345 * primary NID differs or an attempt is made to change
1346 * the Multi-Rail flag. Otherwise the assumption is
1347 * that an existing peer is being modified.
1349 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1350 if (lp->lp_primary_nid != nid)
1352 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1356 /* Delete and recreate as a configured peer. */
1360 /* Create peer, peer_net, and peer_ni. */
1362 lp = lnet_peer_alloc(nid);
1365 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1368 lpni = lnet_peer_ni_alloc(nid);
1372 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1375 LIBCFS_FREE(lpn, sizeof(*lpn));
1377 LIBCFS_FREE(lp, sizeof(*lp));
1379 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1380 libcfs_nid2str(nid), flags, rc);
1385 * Add a NID to a peer. Call with ln_api_mutex held.
1388 * -EPERM: Non-DLC addition to a DLC-configured peer.
1389 * -EEXIST: The NID was configured by DLC for a different peer.
1390 * -ENOMEM: Out of memory.
1391 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1392 * non-multi-rail peer.
1395 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1397 struct lnet_peer_net *lpn;
1398 struct lnet_peer_ni *lpni;
1402 LASSERT(nid != LNET_NID_ANY);
1404 /* A configured peer can only be updated through configuration. */
1405 if (!(flags & LNET_PEER_CONFIGURED)) {
1406 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1413 * The MULTI_RAIL flag can be set but not cleared, because
1414 * that would leave the peer struct in an invalid state.
1416 if (flags & LNET_PEER_MULTI_RAIL) {
1417 spin_lock(&lp->lp_lock);
1418 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1419 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1420 lnet_peer_clr_non_mr_pref_nids(lp);
1422 spin_unlock(&lp->lp_lock);
1423 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1428 lpni = lnet_find_peer_ni_locked(nid);
1431 * A peer_ni already exists. This is only a problem if
1432 * it is not connected to this peer and was configured
1435 lnet_peer_ni_decref_locked(lpni);
1436 if (lpni->lpni_peer_net->lpn_peer == lp)
1438 if (lnet_peer_ni_is_configured(lpni)) {
1442 /* If this is the primary NID, destroy the peer. */
1443 if (lnet_peer_ni_is_primary(lpni)) {
1444 struct lnet_peer *rtr_lp =
1445 lpni->lpni_peer_net->lpn_peer;
1446 int rtr_refcount = rtr_lp->lp_rtr_refcount;
1448 * if we're trying to delete a router it means
1449 * we're moving this peer NI to a new peer so must
1450 * transfer router properties to the new peer
1452 if (rtr_refcount > 0) {
1453 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1454 lnet_rtr_transfer_to_peer(rtr_lp, lp);
1456 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1457 lpni = lnet_peer_ni_alloc(nid);
1464 lpni = lnet_peer_ni_alloc(nid);
1472 * Get the peer_net. Check that we're not adding a second
1473 * peer_ni on a peer_net of a non-multi-rail peer.
1475 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1477 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1482 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1487 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1490 /* If the peer_ni was allocated above its peer_net pointer is NULL */
1491 if (!lpni->lpni_peer_net)
1492 LIBCFS_FREE(lpni, sizeof(*lpni));
1494 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1495 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1501 * Update the primary NID of a peer, if possible.
1503 * Call with the lnet_api_mutex held.
1506 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1508 lnet_nid_t old = lp->lp_primary_nid;
1511 if (lp->lp_primary_nid == nid)
1513 rc = lnet_peer_add_nid(lp, nid, flags);
1516 lp->lp_primary_nid = nid;
1518 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1519 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1524 * lpni creation initiated due to traffic either sending or receiving.
1527 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1529 struct lnet_peer *lp;
1530 struct lnet_peer_net *lpn;
1531 struct lnet_peer_ni *lpni;
1533 * Assume peer is Multi-Rail capable and let discovery find out
1536 unsigned flags = LNET_PEER_MULTI_RAIL;
1539 if (nid == LNET_NID_ANY) {
1544 /* lnet_net_lock is not needed here because ln_api_lock is held */
1545 lpni = lnet_find_peer_ni_locked(nid);
1548 * We must have raced with another thread. Since we
1549 * know next to nothing about a peer_ni created by
1550 * traffic, we just assume everything is ok and
1553 lnet_peer_ni_decref_locked(lpni);
1557 /* Create peer, peer_net, and peer_ni. */
1559 lp = lnet_peer_alloc(nid);
1562 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1565 lpni = lnet_peer_ni_alloc(nid);
1568 if (pref != LNET_NID_ANY)
1569 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1571 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1574 LIBCFS_FREE(lpn, sizeof(*lpn));
1576 LIBCFS_FREE(lp, sizeof(*lp));
1578 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1583 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1585 * This API handles the following combinations:
1586 * Create a peer with its primary NI if only the prim_nid is provided
1587 * Add a NID to a peer identified by the prim_nid. The peer identified
1588 * by the prim_nid must already exist.
1589 * The peer being created may be non-MR.
1591 * The caller must hold ln_api_mutex. This prevents the peer from
1592 * being created/modified/deleted by a different thread.
1595 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1597 struct lnet_peer *lp = NULL;
1598 struct lnet_peer_ni *lpni;
1601 /* The prim_nid must always be specified */
1602 if (prim_nid == LNET_NID_ANY)
1605 flags = LNET_PEER_CONFIGURED;
1607 flags |= LNET_PEER_MULTI_RAIL;
1610 * If nid isn't specified, we must create a new peer with
1611 * prim_nid as its primary nid.
1613 if (nid == LNET_NID_ANY)
1614 return lnet_peer_add(prim_nid, flags);
1616 /* Look up the prim_nid, which must exist. */
1617 lpni = lnet_find_peer_ni_locked(prim_nid);
1620 lnet_peer_ni_decref_locked(lpni);
1621 lp = lpni->lpni_peer_net->lpn_peer;
1623 /* Peer must have been configured. */
1624 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1625 CDEBUG(D_NET, "peer %s was not configured\n",
1626 libcfs_nid2str(prim_nid));
1630 /* Primary NID must match */
1631 if (lp->lp_primary_nid != prim_nid) {
1632 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1633 libcfs_nid2str(prim_nid),
1634 libcfs_nid2str(lp->lp_primary_nid));
1638 /* Multi-Rail flag must match. */
1639 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1640 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1641 libcfs_nid2str(prim_nid));
1645 return lnet_peer_add_nid(lp, nid, flags);
1649 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1651 * This API handles the following combinations:
1652 * Delete a NI from a peer if both prim_nid and nid are provided.
1653 * Delete a peer if only prim_nid is provided.
1654 * Delete a peer if its primary nid is provided.
1656 * The caller must hold ln_api_mutex. This prevents the peer from
1657 * being modified/deleted by a different thread.
1660 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1662 struct lnet_peer *lp;
1663 struct lnet_peer_ni *lpni;
1666 if (prim_nid == LNET_NID_ANY)
1669 lpni = lnet_find_peer_ni_locked(prim_nid);
1672 lnet_peer_ni_decref_locked(lpni);
1673 lp = lpni->lpni_peer_net->lpn_peer;
1675 if (prim_nid != lp->lp_primary_nid) {
1676 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1677 libcfs_nid2str(prim_nid),
1678 libcfs_nid2str(lp->lp_primary_nid));
1682 lnet_net_lock(LNET_LOCK_EX);
1683 if (lp->lp_rtr_refcount > 0) {
1684 lnet_net_unlock(LNET_LOCK_EX);
1685 CERROR("%s is a router. Can not be deleted\n",
1686 libcfs_nid2str(prim_nid));
1689 lnet_net_unlock(LNET_LOCK_EX);
1691 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1692 return lnet_peer_del(lp);
1694 flags = LNET_PEER_CONFIGURED;
1695 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1696 flags |= LNET_PEER_MULTI_RAIL;
1698 return lnet_peer_del_nid(lp, nid, flags);
1702 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
1704 struct lnet_peer_table *ptable;
1705 struct lnet_peer_net *lpn;
1707 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1709 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
1710 LASSERT(list_empty(&lpni->lpni_txq));
1711 LASSERT(lpni->lpni_txqnob == 0);
1712 LASSERT(list_empty(&lpni->lpni_peer_nis));
1713 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1715 lpn = lpni->lpni_peer_net;
1716 lpni->lpni_peer_net = NULL;
1717 lpni->lpni_net = NULL;
1719 /* remove the peer ni from the zombie list */
1720 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1721 spin_lock(&ptable->pt_zombie_lock);
1722 list_del_init(&lpni->lpni_hashlist);
1723 ptable->pt_zombies--;
1724 spin_unlock(&ptable->pt_zombie_lock);
1726 if (lpni->lpni_pref_nnids > 1) {
1727 LIBCFS_FREE(lpni->lpni_pref.nids,
1728 sizeof(*lpni->lpni_pref.nids) * lpni->lpni_pref_nnids);
1730 LIBCFS_FREE(lpni, sizeof(*lpni));
1732 lnet_peer_net_decref_locked(lpn);
1735 struct lnet_peer_ni *
1736 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1738 struct lnet_peer_ni *lpni = NULL;
1741 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1742 return ERR_PTR(-ESHUTDOWN);
1745 * find if a peer_ni already exists.
1746 * If so then just return that.
1748 lpni = lnet_find_peer_ni_locked(nid);
1752 lnet_net_unlock(cpt);
1754 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1757 goto out_net_relock;
1760 lpni = lnet_find_peer_ni_locked(nid);
1770 * Get a peer_ni for the given nid, create it if necessary. Takes a
1771 * hold on the peer_ni.
1773 struct lnet_peer_ni *
1774 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1776 struct lnet_peer_ni *lpni = NULL;
1779 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1780 return ERR_PTR(-ESHUTDOWN);
1783 * find if a peer_ni already exists.
1784 * If so then just return that.
1786 lpni = lnet_find_peer_ni_locked(nid);
1792 * use the lnet_api_mutex to serialize the creation of the peer_ni
1793 * and the creation/deletion of the local ni/net. When a local ni is
1794 * created, if there exists a set of peer_nis on that network,
1795 * they need to be traversed and updated. When a local NI is
1796 * deleted, which could result in a network being deleted, then
1797 * all peer nis on that network need to be removed as well.
1799 * Creation through traffic should also be serialized with
1800 * creation through DLC.
1802 lnet_net_unlock(cpt);
1803 mutex_lock(&the_lnet.ln_api_mutex);
1805 * Shutdown is only set under the ln_api_lock, so a single
1806 * check here is sufficent.
1808 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1809 lpni = ERR_PTR(-ESHUTDOWN);
1810 goto out_mutex_unlock;
1813 rc = lnet_peer_ni_traffic_add(nid, pref);
1816 goto out_mutex_unlock;
1819 lpni = lnet_find_peer_ni_locked(nid);
1823 mutex_unlock(&the_lnet.ln_api_mutex);
1826 /* Lock has been dropped, check again for shutdown. */
1827 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1829 lnet_peer_ni_decref_locked(lpni);
1830 lpni = ERR_PTR(-ESHUTDOWN);
1837 lnet_peer_gw_discovery(struct lnet_peer *lp)
1841 spin_lock(&lp->lp_lock);
1842 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
1844 spin_unlock(&lp->lp_lock);
1850 lnet_peer_is_uptodate(struct lnet_peer *lp)
1854 spin_lock(&lp->lp_lock);
1855 rc = lnet_peer_is_uptodate_locked(lp);
1856 spin_unlock(&lp->lp_lock);
1861 * Is a peer uptodate from the point of view of discovery?
1863 * If it is currently being processed, obviously not.
1864 * A forced Ping or Push is also handled by the discovery thread.
1866 * Otherwise look at whether the peer needs rediscovering.
1869 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
1870 __must_hold(&lp->lp_lock)
1874 if (lp->lp_state & (LNET_PEER_DISCOVERING |
1875 LNET_PEER_FORCE_PING |
1876 LNET_PEER_FORCE_PUSH)) {
1878 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
1880 } else if (lnet_peer_needs_push(lp)) {
1882 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
1883 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
1895 * Queue a peer for the attention of the discovery thread. Call with
1896 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
1897 * -EALREADY if the peer was already queued.
1899 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
1903 spin_lock(&lp->lp_lock);
1904 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
1905 lp->lp_state |= LNET_PEER_DISCOVERING;
1906 spin_unlock(&lp->lp_lock);
1907 if (list_empty(&lp->lp_dc_list)) {
1908 lnet_peer_addref_locked(lp);
1909 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
1910 wake_up(&the_lnet.ln_dc_waitq);
1916 CDEBUG(D_NET, "Queue peer %s: %d\n",
1917 libcfs_nid2str(lp->lp_primary_nid), rc);
1923 * Discovery of a peer is complete. Wake all waiters on the peer.
1924 * Call with lnet_net_lock/EX held.
1926 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
1928 struct lnet_msg *msg, *tmp;
1930 struct list_head pending_msgs;
1932 INIT_LIST_HEAD(&pending_msgs);
1934 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
1935 libcfs_nid2str(lp->lp_primary_nid));
1937 list_del_init(&lp->lp_dc_list);
1938 spin_lock(&lp->lp_lock);
1939 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
1940 spin_unlock(&lp->lp_lock);
1941 wake_up_all(&lp->lp_dc_waitq);
1943 if (lp->lp_rtr_refcount > 0)
1944 lnet_router_discovery_complete(lp);
1946 lnet_net_unlock(LNET_LOCK_EX);
1948 /* iterate through all pending messages and send them again */
1949 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
1950 list_del_init(&msg->msg_list);
1951 if (lp->lp_dc_error) {
1952 lnet_finalize(msg, lp->lp_dc_error);
1956 CDEBUG(D_NET, "sending pending message %s to target %s\n",
1957 lnet_msgtyp2str(msg->msg_type),
1958 libcfs_id2str(msg->msg_target));
1959 rc = lnet_send(msg->msg_src_nid_param, msg,
1960 msg->msg_rtr_nid_param);
1962 CNETERR("Error sending %s to %s: %d\n",
1963 lnet_msgtyp2str(msg->msg_type),
1964 libcfs_id2str(msg->msg_target), rc);
1965 lnet_finalize(msg, rc);
1968 lnet_net_lock(LNET_LOCK_EX);
1969 lnet_peer_decref_locked(lp);
1973 * Handle inbound push.
1974 * Like any event handler, called with lnet_res_lock/CPT held.
1976 void lnet_peer_push_event(struct lnet_event *ev)
1978 struct lnet_ping_buffer *pbuf = ev->md.user_ptr;
1979 struct lnet_peer *lp;
1981 /* lnet_find_peer() adds a refcount */
1982 lp = lnet_find_peer(ev->source.nid);
1984 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
1985 libcfs_nid2str(ev->initiator.nid),
1986 libcfs_nid2str(ev->source.nid));
1990 /* Ensure peer state remains consistent while we modify it. */
1991 spin_lock(&lp->lp_lock);
1994 * If some kind of error happened the contents of the message
1995 * cannot be used. Clear the NIDS_UPTODATE and set the
1996 * FORCE_PING flag to trigger a ping.
1999 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2000 lp->lp_state |= LNET_PEER_FORCE_PING;
2001 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
2003 libcfs_nid2str(lp->lp_primary_nid),
2004 libcfs_nid2str(ev->source.nid));
2009 * A push with invalid or corrupted info. Clear the UPTODATE
2010 * flag to trigger a ping.
2012 if (lnet_ping_info_validate(&pbuf->pb_info)) {
2013 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2014 lp->lp_state |= LNET_PEER_FORCE_PING;
2015 CDEBUG(D_NET, "Corrupted Push from %s\n",
2016 libcfs_nid2str(lp->lp_primary_nid));
2021 * Make sure we'll allocate the correct size ping buffer when
2024 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2025 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2028 * A non-Multi-Rail peer is not supposed to be capable of
2031 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2032 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2033 libcfs_nid2str(lp->lp_primary_nid));
2038 * Check the MULTIRAIL flag. Complain if the peer was DLC
2039 * configured without it.
2041 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
2042 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2043 CERROR("Push says %s is Multi-Rail, DLC says not\n",
2044 libcfs_nid2str(lp->lp_primary_nid));
2046 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2047 lnet_peer_clr_non_mr_pref_nids(lp);
2052 * The peer may have discovery disabled at its end. Set
2053 * NO_DISCOVERY as appropriate.
2055 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2056 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2057 libcfs_nid2str(lp->lp_primary_nid));
2058 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2059 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2060 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2061 libcfs_nid2str(lp->lp_primary_nid));
2062 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2066 * Check for truncation of the Put message. Clear the
2067 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2068 * and tell discovery to allocate a bigger buffer.
2070 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2071 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2072 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2073 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2074 lp->lp_state |= LNET_PEER_FORCE_PING;
2075 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2076 libcfs_nid2str(lp->lp_primary_nid),
2077 pbuf->pb_info.pi_nnis);
2081 /* always assume new data */
2082 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2083 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2086 * If there is data present that hasn't been processed yet,
2087 * we'll replace it if the Put contained newer data and it
2088 * fits. We're racing with a Ping or earlier Push in this
2091 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2092 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2093 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2094 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2095 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2096 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2097 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2098 libcfs_nid2str(lp->lp_primary_nid),
2099 LNET_PING_BUFFER_SEQNO(pbuf),
2100 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2106 * Allocate a buffer to copy the data. On a failure we drop
2107 * the Push and set FORCE_PING to force the discovery
2108 * thread to fix the problem by pinging the peer.
2110 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2112 lp->lp_state |= LNET_PEER_FORCE_PING;
2113 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2114 libcfs_nid2str(lp->lp_primary_nid),
2115 LNET_PING_BUFFER_SEQNO(pbuf));
2120 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2121 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2122 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2123 CDEBUG(D_NET, "Received Push %s %u\n",
2124 libcfs_nid2str(lp->lp_primary_nid),
2125 LNET_PING_BUFFER_SEQNO(pbuf));
2129 * Queue the peer for discovery if not done, force it on the request
2130 * queue and wake the discovery thread if the peer was already queued,
2131 * because its status changed.
2133 spin_unlock(&lp->lp_lock);
2134 lnet_net_lock(LNET_LOCK_EX);
2135 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2136 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2137 wake_up(&the_lnet.ln_dc_waitq);
2139 /* Drop refcount from lookup */
2140 lnet_peer_decref_locked(lp);
2141 lnet_net_unlock(LNET_LOCK_EX);
2145 * Clear the discovery error state, unless we're already discovering
2146 * this peer, in which case the error is current.
2148 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2150 spin_lock(&lp->lp_lock);
2151 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2152 lp->lp_dc_error = 0;
2153 spin_unlock(&lp->lp_lock);
2157 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2158 * dropped/retaken within this function. An lnet_peer_ni is passed in
2159 * because discovery could tear down an lnet_peer.
2162 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2165 struct lnet_peer *lp;
2170 lnet_net_unlock(cpt);
2171 lnet_net_lock(LNET_LOCK_EX);
2172 lp = lpni->lpni_peer_net->lpn_peer;
2173 lnet_peer_clear_discovery_error(lp);
2176 * We're willing to be interrupted. The lpni can become a
2177 * zombie if we race with DLC, so we must check for that.
2180 /* Keep lp alive when the lnet_net_lock is unlocked */
2181 lnet_peer_addref_locked(lp);
2182 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2183 if (signal_pending(current))
2185 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2188 * Don't repeat discovery if discovery is disabled. This is
2189 * done to ensure we can use discovery as a standard ping as
2190 * well for backwards compatibility with routers which do not
2191 * have discovery or have discovery disabled
2193 if (lnet_is_discovery_disabled(lp) && count > 0)
2195 if (lp->lp_dc_error)
2197 if (lnet_peer_is_uptodate(lp))
2199 lnet_peer_queue_for_discovery(lp);
2201 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2204 * If caller requested a non-blocking operation then
2205 * return immediately. Once discovery is complete any
2206 * pending messages that were stopped due to discovery
2207 * will be transmitted.
2212 lnet_net_unlock(LNET_LOCK_EX);
2214 finish_wait(&lp->lp_dc_waitq, &wait);
2215 lnet_net_lock(LNET_LOCK_EX);
2216 lnet_peer_decref_locked(lp);
2217 /* Peer may have changed */
2218 lp = lpni->lpni_peer_net->lpn_peer;
2220 finish_wait(&lp->lp_dc_waitq, &wait);
2222 lnet_net_unlock(LNET_LOCK_EX);
2224 lnet_peer_decref_locked(lp);
2226 * The peer may have changed, so re-check and rediscover if that turns
2227 * out to have been the case. The reference count on lp ensured that
2228 * even if it was unlinked from lpni the memory could not be recycled.
2229 * Thus the check below is sufficient to determine whether the peer
2230 * changed. If the peer changed, then lp must not be dereferenced.
2232 if (lp != lpni->lpni_peer_net->lpn_peer)
2235 if (signal_pending(current))
2237 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2239 else if (lp->lp_dc_error)
2240 rc = lp->lp_dc_error;
2242 CDEBUG(D_NET, "non-blocking discovery\n");
2243 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2246 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2247 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2248 libcfs_nid2str(lpni->lpni_nid), rc,
2249 (!block) ? "pending discovery" : "discovery complete");
2254 /* Handle an incoming ack for a push. */
2256 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2258 struct lnet_ping_buffer *pbuf;
2260 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2261 spin_lock(&lp->lp_lock);
2262 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2263 lp->lp_push_error = ev->status;
2265 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2267 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2268 spin_unlock(&lp->lp_lock);
2270 CDEBUG(D_NET, "peer %s ev->status %d\n",
2271 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2274 /* Handle a Reply message. This is the reply to a Ping message. */
2276 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2278 struct lnet_ping_buffer *pbuf;
2281 spin_lock(&lp->lp_lock);
2284 * If some kind of error happened the contents of message
2285 * cannot be used. Set PING_FAILED to trigger a retry.
2288 lp->lp_state |= LNET_PEER_PING_FAILED;
2289 lp->lp_ping_error = ev->status;
2290 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2292 libcfs_nid2str(lp->lp_primary_nid),
2293 libcfs_nid2str(ev->source.nid));
2297 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2298 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2299 lnet_swap_pinginfo(pbuf);
2302 * A reply with invalid or corrupted info. Set PING_FAILED to
2305 rc = lnet_ping_info_validate(&pbuf->pb_info);
2307 lp->lp_state |= LNET_PEER_PING_FAILED;
2308 lp->lp_ping_error = 0;
2309 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2310 libcfs_nid2str(lp->lp_primary_nid), rc);
2316 * Only enable the multi-rail feature on the peer if both sides of
2317 * the connection have discovery on
2319 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2320 CDEBUG(D_NET, "Peer %s has Multi-Rail feature enabled\n",
2321 libcfs_nid2str(lp->lp_primary_nid));
2322 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2324 CDEBUG(D_NET, "Peer %s has Multi-Rail feature disabled\n",
2325 libcfs_nid2str(lp->lp_primary_nid));
2326 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2330 * The peer may have discovery disabled at its end. Set
2331 * NO_DISCOVERY as appropriate.
2333 if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) &&
2334 !lnet_peer_discovery_disabled) {
2335 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2336 libcfs_nid2str(lp->lp_primary_nid));
2337 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2339 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2340 libcfs_nid2str(lp->lp_primary_nid));
2341 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2345 * Update the MULTI_RAIL flag based on the reply. If the peer
2346 * was configured with DLC then the setting should match what
2349 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2350 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2351 /* Everything's fine */
2352 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2353 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2354 libcfs_nid2str(lp->lp_primary_nid));
2357 * if discovery is disabled then we don't want to
2358 * update the state of the peer. All we'll do is
2359 * update the peer_nis which were reported back in
2363 if (!lnet_is_discovery_disabled_locked(lp)) {
2364 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2365 lnet_peer_clr_non_mr_pref_nids(lp);
2368 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2369 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2370 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2371 libcfs_nid2str(lp->lp_primary_nid));
2373 CERROR("Multi-Rail state vanished from %s\n",
2374 libcfs_nid2str(lp->lp_primary_nid));
2375 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2380 * Make sure we'll allocate the correct size ping buffer when
2383 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2384 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2387 * Check for truncation of the Reply. Clear PING_SENT and set
2388 * PING_FAILED to trigger a retry.
2390 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2391 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2392 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2393 lp->lp_state |= LNET_PEER_PING_FAILED;
2394 lp->lp_ping_error = 0;
2395 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2396 libcfs_nid2str(lp->lp_primary_nid),
2397 pbuf->pb_info.pi_nnis);
2402 * Check the sequence numbers in the reply. These are only
2403 * available if the reply came from a Multi-Rail peer.
2405 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2406 pbuf->pb_info.pi_nnis > 1 &&
2407 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2408 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2409 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2410 libcfs_nid2str(lp->lp_primary_nid),
2411 LNET_PING_BUFFER_SEQNO(pbuf),
2414 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2417 /* We're happy with the state of the data in the buffer. */
2418 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2419 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno, lp->lp_state);
2420 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2421 lnet_ping_buffer_decref(lp->lp_data);
2423 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2424 lnet_ping_buffer_addref(pbuf);
2427 lp->lp_state &= ~LNET_PEER_PING_SENT;
2428 spin_unlock(&lp->lp_lock);
2430 lnet_net_lock(LNET_LOCK_EX);
2432 * If this peer is a gateway, call the routing callback to
2433 * handle the ping reply
2435 if (lp->lp_rtr_refcount > 0)
2436 lnet_router_discovery_ping_reply(lp);
2437 lnet_net_unlock(LNET_LOCK_EX);
2441 * Send event handling. Only matters for error cases, where we clean
2442 * up state on the peer and peer_ni that would otherwise be updated in
2443 * the REPLY event handler for a successful Ping, and the ACK event
2444 * handler for a successful Push.
2447 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2454 spin_lock(&lp->lp_lock);
2455 if (ev->msg_type == LNET_MSG_GET) {
2456 lp->lp_state &= ~LNET_PEER_PING_SENT;
2457 lp->lp_state |= LNET_PEER_PING_FAILED;
2458 lp->lp_ping_error = ev->status;
2459 } else { /* ev->msg_type == LNET_MSG_PUT */
2460 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2461 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2462 lp->lp_push_error = ev->status;
2464 spin_unlock(&lp->lp_lock);
2465 rc = LNET_REDISCOVER_PEER;
2467 CDEBUG(D_NET, "%s Send to %s: %d\n",
2468 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2469 libcfs_nid2str(ev->target.nid), rc);
2474 * Unlink event handling. This event is only seen if a call to
2475 * LNetMDUnlink() caused the event to be unlinked. If this call was
2476 * made after the event was set up in LNetGet() or LNetPut() then we
2477 * assume the Ping or Push timed out.
2480 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2482 spin_lock(&lp->lp_lock);
2483 /* We've passed through LNetGet() */
2484 if (lp->lp_state & LNET_PEER_PING_SENT) {
2485 lp->lp_state &= ~LNET_PEER_PING_SENT;
2486 lp->lp_state |= LNET_PEER_PING_FAILED;
2487 lp->lp_ping_error = -ETIMEDOUT;
2488 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2489 libcfs_nid2str(lp->lp_primary_nid));
2491 /* We've passed through LNetPut() */
2492 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2493 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2494 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2495 lp->lp_push_error = -ETIMEDOUT;
2496 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2497 libcfs_nid2str(lp->lp_primary_nid));
2499 spin_unlock(&lp->lp_lock);
2503 * Event handler for the discovery EQ.
2505 * Called with lnet_res_lock(cpt) held. The cpt is the
2506 * lnet_cpt_of_cookie() of the md handle cookie.
2508 static void lnet_discovery_event_handler(struct lnet_event *event)
2510 struct lnet_peer *lp = event->md.user_ptr;
2511 struct lnet_ping_buffer *pbuf;
2514 /* discovery needs to take another look */
2515 rc = LNET_REDISCOVER_PEER;
2517 CDEBUG(D_NET, "Received event: %d\n", event->type);
2519 switch (event->type) {
2520 case LNET_EVENT_ACK:
2521 lnet_discovery_event_ack(lp, event);
2523 case LNET_EVENT_REPLY:
2524 lnet_discovery_event_reply(lp, event);
2526 case LNET_EVENT_SEND:
2527 /* Only send failure triggers a retry. */
2528 rc = lnet_discovery_event_send(lp, event);
2530 case LNET_EVENT_UNLINK:
2531 /* LNetMDUnlink() was called */
2532 lnet_discovery_event_unlink(lp, event);
2535 /* Invalid events. */
2538 lnet_net_lock(LNET_LOCK_EX);
2539 if (event->unlinked) {
2540 pbuf = LNET_PING_INFO_TO_BUFFER(event->md.start);
2541 lnet_ping_buffer_decref(pbuf);
2542 lnet_peer_decref_locked(lp);
2545 /* put peer back at end of request queue, if discovery not already
2547 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2548 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2549 wake_up(&the_lnet.ln_dc_waitq);
2551 lnet_net_unlock(LNET_LOCK_EX);
2555 * Build a peer from incoming data.
2557 * The NIDs in the incoming data are supposed to be structured as follows:
2560 * - other NIDs in same net
2561 * - NIDs in second net
2562 * - NIDs in third net
2564 * This due to the way the list of NIDs in the data is created.
2566 * Note that this function will mark the peer uptodate unless an
2567 * ENOMEM is encontered. All other errors are due to a conflict
2568 * between the DLC configuration and what discovery sees. We treat DLC
2569 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2570 * peer from becoming stuck in discovery.
2572 static int lnet_peer_merge_data(struct lnet_peer *lp,
2573 struct lnet_ping_buffer *pbuf)
2575 struct lnet_peer_ni *lpni;
2576 lnet_nid_t *curnis = NULL;
2577 struct lnet_ni_status *addnis = NULL;
2578 lnet_nid_t *delnis = NULL;
2588 flags = LNET_PEER_DISCOVERED;
2589 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2590 flags |= LNET_PEER_MULTI_RAIL;
2593 * Cache the routing feature for the peer; whether it is enabled
2594 * for disabled as reported by the remote peer.
2596 spin_lock(&lp->lp_lock);
2597 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
2598 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
2600 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
2601 spin_unlock(&lp->lp_lock);
2603 nnis = MAX(lp->lp_nnis, pbuf->pb_info.pi_nnis);
2604 LIBCFS_ALLOC(curnis, nnis * sizeof(*curnis));
2605 LIBCFS_ALLOC(addnis, nnis * sizeof(*addnis));
2606 LIBCFS_ALLOC(delnis, nnis * sizeof(*delnis));
2607 if (!curnis || !addnis || !delnis) {
2615 /* Construct the list of NIDs present in peer. */
2617 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2618 curnis[ncurnis++] = lpni->lpni_nid;
2621 * Check for NIDs in pbuf not present in curnis[].
2622 * The loop starts at 1 to skip the loopback NID.
2624 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2625 for (j = 0; j < ncurnis; j++)
2626 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2629 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
2632 * Check for NIDs in curnis[] not present in pbuf.
2633 * The nested loop starts at 1 to skip the loopback NID.
2635 * But never add the loopback NID to delnis[]: if it is
2636 * present in curnis[] then this peer is for this node.
2638 for (i = 0; i < ncurnis; i++) {
2639 if (LNET_NETTYP(LNET_NIDNET(curnis[i])) == LOLND)
2641 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
2642 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
2644 * update the information we cache for the
2645 * peer with the latest information we
2648 lpni = lnet_find_peer_ni_locked(curnis[i]);
2650 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
2651 lnet_peer_ni_decref_locked(lpni);
2656 if (j == pbuf->pb_info.pi_nnis)
2657 delnis[ndelnis++] = curnis[i];
2661 * If we get here and the discovery is disabled then we don't want
2662 * to add or delete any NIs. We just updated the ones we have some
2663 * information on, and call it a day
2666 if (lnet_is_discovery_disabled(lp))
2669 for (i = 0; i < naddnis; i++) {
2670 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
2672 CERROR("Error adding NID %s to peer %s: %d\n",
2673 libcfs_nid2str(addnis[i].ns_nid),
2674 libcfs_nid2str(lp->lp_primary_nid), rc);
2678 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
2680 lpni->lpni_ns_status = addnis[i].ns_status;
2681 lnet_peer_ni_decref_locked(lpni);
2685 for (i = 0; i < ndelnis; i++) {
2687 * for routers it's okay to delete the primary_nid because
2688 * the upper layers don't really rely on it. So if we're
2689 * being told that the router changed its primary_nid
2690 * then it's okay to delete it.
2692 if (lp->lp_rtr_refcount > 0)
2693 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
2694 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2696 CERROR("Error deleting NID %s from peer %s: %d\n",
2697 libcfs_nid2str(delnis[i]),
2698 libcfs_nid2str(lp->lp_primary_nid), rc);
2704 * Errors other than -ENOMEM are due to peers having been
2705 * configured with DLC. Ignore these because DLC overrides
2710 LIBCFS_FREE(curnis, nnis * sizeof(*curnis));
2711 LIBCFS_FREE(addnis, nnis * sizeof(*addnis));
2712 LIBCFS_FREE(delnis, nnis * sizeof(*delnis));
2713 lnet_ping_buffer_decref(pbuf);
2714 CDEBUG(D_NET, "peer %s (%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
2717 spin_lock(&lp->lp_lock);
2718 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2719 lp->lp_state |= LNET_PEER_FORCE_PING;
2720 spin_unlock(&lp->lp_lock);
2726 * The data in pbuf says lp is its primary peer, but the data was
2727 * received by a different peer. Try to update lp with the data.
2730 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2732 struct lnet_handle_md mdh;
2734 /* Queue lp for discovery, and force it on the request queue. */
2735 lnet_net_lock(LNET_LOCK_EX);
2736 if (lnet_peer_queue_for_discovery(lp))
2737 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2738 lnet_net_unlock(LNET_LOCK_EX);
2740 LNetInvalidateMDHandle(&mdh);
2743 * Decide whether we can move the peer to the DATA_PRESENT state.
2745 * We replace stale data for a multi-rail peer, repair PING_FAILED
2746 * status, and preempt FORCE_PING.
2748 * If after that we have DATA_PRESENT, we merge it into this peer.
2750 spin_lock(&lp->lp_lock);
2751 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2752 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2753 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2754 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2755 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2756 lnet_ping_buffer_decref(pbuf);
2761 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2762 lnet_ping_buffer_decref(lp->lp_data);
2764 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2766 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2767 mdh = lp->lp_ping_mdh;
2768 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2769 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2770 lp->lp_ping_error = 0;
2772 if (lp->lp_state & LNET_PEER_FORCE_PING)
2773 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2774 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2775 spin_unlock(&lp->lp_lock);
2777 if (!LNetMDHandleIsInvalid(mdh))
2781 return lnet_peer_merge_data(lp, pbuf);
2783 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2787 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
2791 for (i = 0; i < pinfo->pi_nnis; i++) {
2792 if (pinfo->pi_ni[i].ns_nid == nid)
2800 * Update a peer using the data received.
2802 static int lnet_peer_data_present(struct lnet_peer *lp)
2803 __must_hold(&lp->lp_lock)
2805 struct lnet_ping_buffer *pbuf;
2806 struct lnet_peer_ni *lpni;
2807 lnet_nid_t nid = LNET_NID_ANY;
2813 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2814 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2815 spin_unlock(&lp->lp_lock);
2818 * Modifications of peer structures are done while holding the
2819 * ln_api_mutex. A global lock is required because we may be
2820 * modifying multiple peer structures, and a mutex greatly
2821 * simplifies memory management.
2823 * The actual changes to the data structures must also protect
2824 * against concurrent lookups, for which the lnet_net_lock in
2825 * LNET_LOCK_EX mode is used.
2827 mutex_lock(&the_lnet.ln_api_mutex);
2828 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2834 * If this peer is not on the peer list then it is being torn
2835 * down, and our reference count may be all that is keeping it
2836 * alive. Don't do any work on it.
2838 if (list_empty(&lp->lp_peer_list))
2841 flags = LNET_PEER_DISCOVERED;
2842 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2843 flags |= LNET_PEER_MULTI_RAIL;
2846 * Check whether the primary NID in the message matches the
2847 * primary NID of the peer. If it does, update the peer, if
2848 * it it does not, check whether there is already a peer with
2849 * that primary NID. If no such peer exists, try to update
2850 * the primary NID of the current peer (allowed if it was
2851 * created due to message traffic) and complete the update.
2852 * If the peer did exist, hand off the data to it.
2854 * The peer for the loopback interface is a special case: this
2855 * is the peer for the local node, and we want to set its
2856 * primary NID to the correct value here. Moreover, this peer
2857 * can show up with only the loopback NID in the ping buffer.
2859 if (pbuf->pb_info.pi_nnis <= 1)
2861 nid = pbuf->pb_info.pi_ni[1].ns_nid;
2862 if (LNET_NETTYP(LNET_NIDNET(lp->lp_primary_nid)) == LOLND) {
2863 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2865 rc = lnet_peer_merge_data(lp, pbuf);
2867 * if the primary nid of the peer is present in the ping info returned
2868 * from the peer, but it's not the local primary peer we have
2869 * cached and discovery is disabled, then we don't want to update
2870 * our local peer info, by adding or removing NIDs, we just want
2871 * to update the status of the nids that we currently have
2872 * recorded in that peer.
2874 } else if (lp->lp_primary_nid == nid ||
2875 (lnet_is_nid_in_ping_info(lp->lp_primary_nid, &pbuf->pb_info) &&
2876 lnet_is_discovery_disabled(lp))) {
2877 rc = lnet_peer_merge_data(lp, pbuf);
2879 lpni = lnet_find_peer_ni_locked(nid);
2881 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2883 CERROR("Primary NID error %s versus %s: %d\n",
2884 libcfs_nid2str(lp->lp_primary_nid),
2885 libcfs_nid2str(nid), rc);
2887 rc = lnet_peer_merge_data(lp, pbuf);
2890 struct lnet_peer *new_lp;
2891 new_lp = lpni->lpni_peer_net->lpn_peer;
2893 * if lp has discovery/MR enabled that means new_lp
2894 * should have discovery/MR enabled as well, since
2895 * it's the same peer, which we're about to merge
2897 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2898 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2899 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
2900 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
2902 rc = lnet_peer_set_primary_data(new_lp, pbuf);
2903 lnet_consolidate_routes_locked(lp, new_lp);
2904 lnet_peer_ni_decref_locked(lpni);
2908 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc,
2910 mutex_unlock(&the_lnet.ln_api_mutex);
2912 spin_lock(&lp->lp_lock);
2913 /* Tell discovery to re-check the peer immediately. */
2915 rc = LNET_REDISCOVER_PEER;
2920 * A ping failed. Clear the PING_FAILED state and set the
2921 * FORCE_PING state, to ensure a retry even if discovery is
2922 * disabled. This avoids being left with incorrect state.
2924 static int lnet_peer_ping_failed(struct lnet_peer *lp)
2925 __must_hold(&lp->lp_lock)
2927 struct lnet_handle_md mdh;
2930 mdh = lp->lp_ping_mdh;
2931 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2932 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2933 lp->lp_state |= LNET_PEER_FORCE_PING;
2934 rc = lp->lp_ping_error;
2935 lp->lp_ping_error = 0;
2936 spin_unlock(&lp->lp_lock);
2938 if (!LNetMDHandleIsInvalid(mdh))
2941 CDEBUG(D_NET, "peer %s:%d\n",
2942 libcfs_nid2str(lp->lp_primary_nid), rc);
2944 spin_lock(&lp->lp_lock);
2945 return rc ? rc : LNET_REDISCOVER_PEER;
2949 * Select NID to send a Ping or Push to.
2951 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
2953 struct lnet_peer_ni *lpni;
2955 /* Look for a direct-connected NID for this peer. */
2957 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2958 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
2963 return lpni->lpni_nid;
2965 /* Look for a routed-connected NID for this peer. */
2967 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2968 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
2973 return lpni->lpni_nid;
2975 return LNET_NID_ANY;
2978 /* Active side of ping. */
2979 static int lnet_peer_send_ping(struct lnet_peer *lp)
2980 __must_hold(&lp->lp_lock)
2987 lp->lp_state |= LNET_PEER_PING_SENT;
2988 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2989 spin_unlock(&lp->lp_lock);
2991 cpt = lnet_net_lock_current();
2992 /* Refcount for MD. */
2993 lnet_peer_addref_locked(lp);
2994 pnid = lnet_peer_select_nid(lp);
2995 lnet_net_unlock(cpt);
2997 nnis = MAX(lp->lp_data_nnis, LNET_INTERFACES_MIN);
2999 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
3000 the_lnet.ln_dc_eqh, false);
3003 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3004 * refcount on the peer, otherwise LNetMDUnlink will be called
3005 * which will eventually do that.
3009 lnet_peer_decref_locked(lp);
3010 lnet_net_unlock(cpt);
3011 rc = -rc; /* change the rc to negative value */
3013 } else if (rc < 0) {
3017 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3019 spin_lock(&lp->lp_lock);
3023 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
3025 * The errors that get us here are considered hard errors and
3026 * cause Discovery to terminate. So we clear PING_SENT, but do
3027 * not set either PING_FAILED or FORCE_PING. In fact we need
3028 * to clear PING_FAILED, because the unlink event handler will
3029 * have set it if we called LNetMDUnlink() above.
3031 spin_lock(&lp->lp_lock);
3032 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3037 * This function exists because you cannot call LNetMDUnlink() from an
3040 static int lnet_peer_push_failed(struct lnet_peer *lp)
3041 __must_hold(&lp->lp_lock)
3043 struct lnet_handle_md mdh;
3046 mdh = lp->lp_push_mdh;
3047 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3048 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3049 rc = lp->lp_push_error;
3050 lp->lp_push_error = 0;
3051 spin_unlock(&lp->lp_lock);
3053 if (!LNetMDHandleIsInvalid(mdh))
3056 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3057 spin_lock(&lp->lp_lock);
3058 return rc ? rc : LNET_REDISCOVER_PEER;
3061 /* Active side of push. */
3062 static int lnet_peer_send_push(struct lnet_peer *lp)
3063 __must_hold(&lp->lp_lock)
3065 struct lnet_ping_buffer *pbuf;
3066 struct lnet_process_id id;
3071 /* Don't push to a non-multi-rail peer. */
3072 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3073 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3077 lp->lp_state |= LNET_PEER_PUSH_SENT;
3078 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3079 spin_unlock(&lp->lp_lock);
3081 cpt = lnet_net_lock_current();
3082 pbuf = the_lnet.ln_ping_target;
3083 lnet_ping_buffer_addref(pbuf);
3084 lnet_net_unlock(cpt);
3086 /* Push source MD */
3087 md.start = &pbuf->pb_info;
3088 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3089 md.threshold = 2; /* Put/Ack */
3092 md.eq_handle = the_lnet.ln_dc_eqh;
3095 rc = LNetMDBind(md, LNET_UNLINK, &lp->lp_push_mdh);
3097 lnet_ping_buffer_decref(pbuf);
3098 CERROR("Can't bind push source MD: %d\n", rc);
3101 cpt = lnet_net_lock_current();
3102 /* Refcount for MD. */
3103 lnet_peer_addref_locked(lp);
3104 id.pid = LNET_PID_LUSTRE;
3105 id.nid = lnet_peer_select_nid(lp);
3106 lnet_net_unlock(cpt);
3108 if (id.nid == LNET_NID_ANY) {
3113 rc = LNetPut(LNET_NID_ANY, lp->lp_push_mdh,
3114 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3115 LNET_PROTO_PING_MATCHBITS, 0, 0);
3120 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3122 spin_lock(&lp->lp_lock);
3126 LNetMDUnlink(lp->lp_push_mdh);
3127 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3129 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
3131 * The errors that get us here are considered hard errors and
3132 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3133 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3134 * because the unlink event handler will have set it if we
3135 * called LNetMDUnlink() above.
3137 spin_lock(&lp->lp_lock);
3138 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3143 * An unrecoverable error was encountered during discovery.
3144 * Set error status in peer and abort discovery.
3146 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3148 CDEBUG(D_NET, "Discovery error %s: %d\n",
3149 libcfs_nid2str(lp->lp_primary_nid), error);
3151 spin_lock(&lp->lp_lock);
3152 lp->lp_dc_error = error;
3153 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3154 lp->lp_state |= LNET_PEER_REDISCOVER;
3155 spin_unlock(&lp->lp_lock);
3159 * Mark the peer as discovered.
3161 static int lnet_peer_discovered(struct lnet_peer *lp)
3162 __must_hold(&lp->lp_lock)
3164 lp->lp_state |= LNET_PEER_DISCOVERED;
3165 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3166 LNET_PEER_REDISCOVER);
3168 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3175 * Discovering this peer is taking too long. Cancel any Ping or Push
3176 * that discovery is waiting on by unlinking the relevant MDs. The
3177 * lnet_discovery_event_handler() will proceed from here and complete
3180 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
3182 struct lnet_handle_md ping_mdh;
3183 struct lnet_handle_md push_mdh;
3185 LNetInvalidateMDHandle(&ping_mdh);
3186 LNetInvalidateMDHandle(&push_mdh);
3188 spin_lock(&lp->lp_lock);
3189 if (lp->lp_state & LNET_PEER_PING_SENT) {
3190 ping_mdh = lp->lp_ping_mdh;
3191 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3193 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
3194 push_mdh = lp->lp_push_mdh;
3195 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3197 spin_unlock(&lp->lp_lock);
3199 if (!LNetMDHandleIsInvalid(ping_mdh))
3200 LNetMDUnlink(ping_mdh);
3201 if (!LNetMDHandleIsInvalid(push_mdh))
3202 LNetMDUnlink(push_mdh);
3206 * Wait for work to be queued or some other change that must be
3207 * attended to. Returns non-zero if the discovery thread should shut
3210 static int lnet_peer_discovery_wait_for_work(void)
3217 cpt = lnet_net_lock_current();
3219 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3220 TASK_INTERRUPTIBLE);
3221 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3223 if (lnet_push_target_resize_needed())
3225 if (!list_empty(&the_lnet.ln_dc_request))
3227 if (!list_empty(&the_lnet.ln_msg_resend))
3229 lnet_net_unlock(cpt);
3232 * wakeup max every second to check if there are peers that
3233 * have been stuck on the working queue for greater than
3236 schedule_timeout(cfs_time_seconds(1));
3237 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3238 cpt = lnet_net_lock_current();
3240 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3242 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3245 lnet_net_unlock(cpt);
3247 CDEBUG(D_NET, "woken: %d\n", rc);
3253 * Messages that were pending on a destroyed peer will be put on a global
3254 * resend list. The message resend list will be checked by
3255 * the discovery thread when it wakes up, and will resend messages. These
3256 * messages can still be sendable in the case the lpni which was the initial
3257 * cause of the message re-queue was transfered to another peer.
3259 * It is possible that LNet could be shutdown while we're iterating
3260 * through the list. lnet_shudown_lndnets() will attempt to access the
3261 * resend list, but will have to wait until the spinlock is released, by
3262 * which time there shouldn't be any more messages on the resend list.
3263 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3264 * for the messages so they can be released. The other case is that
3265 * lnet_shudown_lndnets() can finalize all the messages before this
3266 * function can visit the resend list, in which case this function will be
3269 static void lnet_resend_msgs(void)
3271 struct lnet_msg *msg, *tmp;
3272 struct list_head resend;
3275 INIT_LIST_HEAD(&resend);
3277 spin_lock(&the_lnet.ln_msg_resend_lock);
3278 list_splice(&the_lnet.ln_msg_resend, &resend);
3279 spin_unlock(&the_lnet.ln_msg_resend_lock);
3281 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3282 list_del_init(&msg->msg_list);
3283 rc = lnet_send(msg->msg_src_nid_param, msg,
3284 msg->msg_rtr_nid_param);
3286 CNETERR("Error sending %s to %s: %d\n",
3287 lnet_msgtyp2str(msg->msg_type),
3288 libcfs_id2str(msg->msg_target), rc);
3289 lnet_finalize(msg, rc);
3294 /* The discovery thread. */
3295 static int lnet_peer_discovery(void *arg)
3297 struct lnet_peer *lp;
3300 wait_for_completion(&the_lnet.ln_started);
3302 CDEBUG(D_NET, "started\n");
3303 cfs_block_allsigs();
3306 if (lnet_peer_discovery_wait_for_work())
3311 if (lnet_push_target_resize_needed())
3312 lnet_push_target_resize();
3314 lnet_net_lock(LNET_LOCK_EX);
3315 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3319 * Process all incoming discovery work requests. When
3320 * discovery must wait on a peer to change state, it
3321 * is added to the tail of the ln_dc_working queue. A
3322 * timestamp keeps track of when the peer was added,
3323 * so we can time out discovery requests that take too
3326 while (!list_empty(&the_lnet.ln_dc_request)) {
3327 lp = list_first_entry(&the_lnet.ln_dc_request,
3328 struct lnet_peer, lp_dc_list);
3329 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3331 * set the time the peer was put on the dc_working
3332 * queue. It shouldn't remain on the queue
3333 * forever, in case the GET message (for ping)
3334 * doesn't get a REPLY or the PUT message (for
3335 * push) doesn't get an ACK.
3337 lp->lp_last_queued = ktime_get_real_seconds();
3338 lnet_net_unlock(LNET_LOCK_EX);
3341 * Select an action depending on the state of
3342 * the peer and whether discovery is disabled.
3343 * The check whether discovery is disabled is
3344 * done after the code that handles processing
3345 * for arrived data, cleanup for failures, and
3346 * forcing a Ping or Push.
3348 spin_lock(&lp->lp_lock);
3349 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3350 libcfs_nid2str(lp->lp_primary_nid), lp,
3352 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3353 rc = lnet_peer_data_present(lp);
3354 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3355 rc = lnet_peer_ping_failed(lp);
3356 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3357 rc = lnet_peer_push_failed(lp);
3358 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3359 rc = lnet_peer_send_ping(lp);
3360 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3361 rc = lnet_peer_send_push(lp);
3362 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3363 rc = lnet_peer_send_ping(lp);
3364 else if (lnet_peer_needs_push(lp))
3365 rc = lnet_peer_send_push(lp);
3367 rc = lnet_peer_discovered(lp);
3368 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3369 libcfs_nid2str(lp->lp_primary_nid), lp,
3371 spin_unlock(&lp->lp_lock);
3373 lnet_net_lock(LNET_LOCK_EX);
3374 if (rc == LNET_REDISCOVER_PEER) {
3375 list_move(&lp->lp_dc_list,
3376 &the_lnet.ln_dc_request);
3378 lnet_peer_discovery_error(lp, rc);
3380 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3381 lnet_peer_discovery_complete(lp);
3382 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3386 lnet_net_unlock(LNET_LOCK_EX);
3389 CDEBUG(D_NET, "stopping\n");
3391 * Clean up before telling lnet_peer_discovery_stop() that
3392 * we're done. Use wake_up() below to somewhat reduce the
3393 * size of the thundering herd if there are multiple threads
3394 * waiting on discovery of a single peer.
3397 /* Queue cleanup 1: stop all pending pings and pushes. */
3398 lnet_net_lock(LNET_LOCK_EX);
3399 while (!list_empty(&the_lnet.ln_dc_working)) {
3400 lp = list_first_entry(&the_lnet.ln_dc_working,
3401 struct lnet_peer, lp_dc_list);
3402 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3403 lnet_net_unlock(LNET_LOCK_EX);
3404 lnet_peer_cancel_discovery(lp);
3405 lnet_net_lock(LNET_LOCK_EX);
3407 lnet_net_unlock(LNET_LOCK_EX);
3409 /* Queue cleanup 2: wait for the expired queue to clear. */
3410 while (!list_empty(&the_lnet.ln_dc_expired))
3411 schedule_timeout(cfs_time_seconds(1));
3413 /* Queue cleanup 3: clear the request queue. */
3414 lnet_net_lock(LNET_LOCK_EX);
3415 while (!list_empty(&the_lnet.ln_dc_request)) {
3416 lp = list_first_entry(&the_lnet.ln_dc_request,
3417 struct lnet_peer, lp_dc_list);
3418 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3419 lnet_peer_discovery_complete(lp);
3421 lnet_net_unlock(LNET_LOCK_EX);
3423 LNetEQFree(the_lnet.ln_dc_eqh);
3424 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3426 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3427 wake_up(&the_lnet.ln_dc_waitq);
3429 CDEBUG(D_NET, "stopped\n");
3434 /* ln_api_mutex is held on entry. */
3435 int lnet_peer_discovery_start(void)
3437 struct task_struct *task;
3440 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3443 rc = LNetEQAlloc(0, lnet_discovery_event_handler, &the_lnet.ln_dc_eqh);
3445 CERROR("Can't allocate discovery EQ: %d\n", rc);
3449 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3450 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3453 CERROR("Can't start peer discovery thread: %d\n", rc);
3455 LNetEQFree(the_lnet.ln_dc_eqh);
3456 LNetInvalidateEQHandle(&the_lnet.ln_dc_eqh);
3458 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3461 CDEBUG(D_NET, "discovery start: %d\n", rc);
3466 /* ln_api_mutex is held on entry. */
3467 void lnet_peer_discovery_stop(void)
3469 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3472 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3473 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3475 /* In the LNetNIInit() path we may be stopping discovery before it
3476 * entered its work loop
3478 if (!completion_done(&the_lnet.ln_started))
3479 complete(&the_lnet.ln_started);
3481 wake_up(&the_lnet.ln_dc_waitq);
3483 wait_event(the_lnet.ln_dc_waitq,
3484 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3486 LASSERT(list_empty(&the_lnet.ln_dc_request));
3487 LASSERT(list_empty(&the_lnet.ln_dc_working));
3488 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3490 CDEBUG(D_NET, "discovery stopped\n");
3496 lnet_debug_peer(lnet_nid_t nid)
3498 char *aliveness = "NA";
3499 struct lnet_peer_ni *lp;
3502 cpt = lnet_cpt_of_nid(nid, NULL);
3505 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3507 lnet_net_unlock(cpt);
3508 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3512 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3513 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3515 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3516 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
3517 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3518 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3519 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3521 lnet_peer_ni_decref_locked(lp);
3523 lnet_net_unlock(cpt);
3526 /* Gathering information for userspace. */
3528 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3529 char aliveness[LNET_MAX_STR_LEN],
3530 __u32 *cpt_iter, __u32 *refcount,
3531 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3532 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3533 __u32 *peer_tx_qnob)
3535 struct lnet_peer_table *peer_table;
3536 struct lnet_peer_ni *lp;
3541 /* get the number of CPTs */
3542 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3544 /* if the cpt number to be examined is >= the number of cpts in
3545 * the system then indicate that there are no more cpts to examin
3547 if (*cpt_iter >= lncpt)
3550 /* get the current table */
3551 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3552 /* if the ptable is NULL then there are no more cpts to examine */
3553 if (peer_table == NULL)
3556 lnet_net_lock(*cpt_iter);
3558 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3559 struct list_head *peers = &peer_table->pt_hash[j];
3561 list_for_each_entry(lp, peers, lpni_hashlist) {
3562 if (peer_index-- > 0)
3565 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3566 if (lnet_isrouter(lp) ||
3567 lnet_peer_aliveness_enabled(lp))
3568 snprintf(aliveness, LNET_MAX_STR_LEN,
3569 lnet_is_peer_ni_alive(lp) ? "up" : "down");
3571 *nid = lp->lpni_nid;
3572 *refcount = atomic_read(&lp->lpni_refcount);
3573 *ni_peer_tx_credits =
3574 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3575 *peer_tx_credits = lp->lpni_txcredits;
3576 *peer_rtr_credits = lp->lpni_rtrcredits;
3577 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3578 *peer_tx_qnob = lp->lpni_txqnob;
3584 lnet_net_unlock(*cpt_iter);
3588 return found ? 0 : -ENOENT;
3591 /* ln_api_mutex is held, which keeps the peer list stable */
3592 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3594 struct lnet_ioctl_element_stats *lpni_stats;
3595 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3596 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3597 struct lnet_peer_ni_credit_info *lpni_info;
3598 struct lnet_peer_ni *lpni;
3599 struct lnet_peer *lp;
3604 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3611 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3612 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3613 size *= lp->lp_nnis;
3614 if (size > cfg->prcfg_size) {
3615 cfg->prcfg_size = size;
3620 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3621 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3622 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3623 cfg->prcfg_count = lp->lp_nnis;
3624 cfg->prcfg_size = size;
3625 cfg->prcfg_state = lp->lp_state;
3627 /* Allocate helper buffers. */
3629 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3632 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3635 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3636 if (!lpni_msg_stats)
3637 goto out_free_stats;
3638 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3640 goto out_free_msg_stats;
3645 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3646 nid = lpni->lpni_nid;
3647 if (copy_to_user(bulk, &nid, sizeof(nid)))
3648 goto out_free_hstats;
3649 bulk += sizeof(nid);
3651 memset(lpni_info, 0, sizeof(*lpni_info));
3652 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3653 if (lnet_isrouter(lpni) ||
3654 lnet_peer_aliveness_enabled(lpni))
3655 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3656 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
3658 lpni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
3659 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3660 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3661 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3662 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3663 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3664 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3665 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3666 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3667 goto out_free_hstats;
3668 bulk += sizeof(*lpni_info);
3670 memset(lpni_stats, 0, sizeof(*lpni_stats));
3671 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3672 LNET_STATS_TYPE_SEND);
3673 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3674 LNET_STATS_TYPE_RECV);
3675 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3676 LNET_STATS_TYPE_DROP);
3677 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3678 goto out_free_hstats;
3679 bulk += sizeof(*lpni_stats);
3680 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3681 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3682 goto out_free_hstats;
3683 bulk += sizeof(*lpni_msg_stats);
3684 lpni_hstats->hlpni_network_timeout =
3685 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3686 lpni_hstats->hlpni_remote_dropped =
3687 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3688 lpni_hstats->hlpni_remote_timeout =
3689 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3690 lpni_hstats->hlpni_remote_error =
3691 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3692 lpni_hstats->hlpni_health_value =
3693 atomic_read(&lpni->lpni_healthv);
3694 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3695 goto out_free_hstats;
3696 bulk += sizeof(*lpni_hstats);
3701 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3703 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3705 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3707 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
3709 lnet_peer_decref_locked(lp);
3715 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni)
3717 /* the mt could've shutdown and cleaned up the queues */
3718 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
3721 if (list_empty(&lpni->lpni_recovery) &&
3722 atomic_read(&lpni->lpni_healthv) < LNET_MAX_HEALTH_VALUE) {
3723 CERROR("lpni %s added to recovery queue. Health = %d\n",
3724 libcfs_nid2str(lpni->lpni_nid),
3725 atomic_read(&lpni->lpni_healthv));
3726 list_add_tail(&lpni->lpni_recovery, &the_lnet.ln_mt_peerNIRecovq);
3727 lnet_peer_ni_addref_locked(lpni);
3731 /* Call with the ln_api_mutex held */
3733 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3735 struct lnet_peer_table *ptable;
3736 struct lnet_peer *lp;
3737 struct lnet_peer_net *lpn;
3738 struct lnet_peer_ni *lpni;
3742 if (the_lnet.ln_state != LNET_STATE_RUNNING)
3746 lnet_net_lock(LNET_LOCK_EX);
3747 lpni = lnet_find_peer_ni_locked(nid);
3749 lnet_net_unlock(LNET_LOCK_EX);
3752 atomic_set(&lpni->lpni_healthv, value);
3753 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3754 lnet_peer_ni_decref_locked(lpni);
3755 lnet_net_unlock(LNET_LOCK_EX);
3759 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3762 * Walk all the peers and reset the healhv for each one to the
3765 lnet_net_lock(LNET_LOCK_EX);
3766 for (cpt = 0; cpt < lncpt; cpt++) {
3767 ptable = the_lnet.ln_peer_tables[cpt];
3768 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
3769 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
3770 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
3772 atomic_set(&lpni->lpni_healthv, value);
3773 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3778 lnet_net_unlock(LNET_LOCK_EX);