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 CFS_FREE_PTR_ARRAY(hash, LNET_PEER_HASH_SIZE);
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 = lpni2->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)
579 wait_var_event_warning(&ptable->pt_zombies,
580 ptable->pt_zombies == 0,
581 "Waiting for %d zombies on peer table\n",
586 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
587 struct lnet_peer_table *ptable)
589 struct lnet_peer_ni *lp;
590 struct lnet_peer_ni *tmp;
594 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
595 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
597 if (net != lp->lpni_net)
600 if (!lnet_isrouter(lp))
603 gw_nid = lp->lpni_peer_net->lpn_peer->lp_primary_nid;
605 lnet_net_unlock(LNET_LOCK_EX);
606 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), gw_nid);
607 lnet_net_lock(LNET_LOCK_EX);
613 lnet_peer_tables_cleanup(struct lnet_net *net)
616 struct lnet_peer_table *ptable;
618 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
619 /* If just deleting the peers for a NI, get rid of any routes these
620 * peers are gateways for. */
621 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
622 lnet_net_lock(LNET_LOCK_EX);
623 lnet_peer_table_del_rtrs_locked(net, ptable);
624 lnet_net_unlock(LNET_LOCK_EX);
627 /* Start the cleanup process */
628 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
629 lnet_net_lock(LNET_LOCK_EX);
630 lnet_peer_table_cleanup_locked(net, ptable);
631 lnet_net_unlock(LNET_LOCK_EX);
634 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
635 lnet_peer_ni_finalize_wait(ptable);
638 static struct lnet_peer_ni *
639 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
641 struct list_head *peers;
642 struct lnet_peer_ni *lp;
644 if (the_lnet.ln_state != LNET_STATE_RUNNING)
647 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
648 list_for_each_entry(lp, peers, lpni_hashlist) {
649 if (lp->lpni_nid == nid) {
650 lnet_peer_ni_addref_locked(lp);
658 struct lnet_peer_ni *
659 lnet_find_peer_ni_locked(lnet_nid_t nid)
661 struct lnet_peer_ni *lpni;
662 struct lnet_peer_table *ptable;
665 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
667 ptable = the_lnet.ln_peer_tables[cpt];
668 lpni = lnet_get_peer_ni_locked(ptable, nid);
673 struct lnet_peer_ni *
674 lnet_peer_get_ni_locked(struct lnet_peer *lp, lnet_nid_t nid)
676 struct lnet_peer_net *lpn;
677 struct lnet_peer_ni *lpni;
679 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
683 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
684 if (lpni->lpni_nid == nid)
692 lnet_find_peer(lnet_nid_t nid)
694 struct lnet_peer_ni *lpni;
695 struct lnet_peer *lp = NULL;
698 cpt = lnet_net_lock_current();
699 lpni = lnet_find_peer_ni_locked(nid);
701 lp = lpni->lpni_peer_net->lpn_peer;
702 lnet_peer_addref_locked(lp);
703 lnet_peer_ni_decref_locked(lpni);
705 lnet_net_unlock(cpt);
710 struct lnet_peer_net *
711 lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
713 struct lnet_peer_net *net;
716 /* no net id provided return the first net */
717 net = list_first_entry_or_null(&lp->lp_peer_nets,
718 struct lnet_peer_net,
724 /* find the net after the one provided */
725 list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
726 if (net->lpn_net_id == prev_lpn_id) {
728 * if we reached the end of the list loop to the
731 if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
732 return list_first_entry_or_null(&lp->lp_peer_nets,
733 struct lnet_peer_net,
736 return list_next_entry(net, lpn_peer_nets);
743 struct lnet_peer_ni *
744 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
745 struct lnet_peer_net *peer_net,
746 struct lnet_peer_ni *prev)
748 struct lnet_peer_ni *lpni;
749 struct lnet_peer_net *net = peer_net;
753 if (list_empty(&peer->lp_peer_nets))
756 net = list_entry(peer->lp_peer_nets.next,
757 struct lnet_peer_net,
760 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
766 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
768 * if you reached the end of the peer ni list and the peer
769 * net is specified then there are no more peer nis in that
776 * we reached the end of this net ni list. move to the
779 if (prev->lpni_peer_net->lpn_peer_nets.next ==
781 /* no more nets and no more NIs. */
784 /* get the next net */
785 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
786 struct lnet_peer_net,
788 /* get the ni on it */
789 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
795 /* there are more nis left */
796 lpni = list_entry(prev->lpni_peer_nis.next,
797 struct lnet_peer_ni, lpni_peer_nis);
802 /* Call with the ln_api_mutex held */
803 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
805 struct lnet_process_id id;
806 struct lnet_peer_table *ptable;
807 struct lnet_peer *lp;
816 if (the_lnet.ln_state != LNET_STATE_RUNNING)
819 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
822 * Count the number of peers, and return E2BIG if the buffer
823 * is too small. We'll also return the desired size.
826 for (cpt = 0; cpt < lncpt; cpt++) {
827 ptable = the_lnet.ln_peer_tables[cpt];
828 count += ptable->pt_peers;
830 size = count * sizeof(*ids);
835 * Walk the peer lists and copy out the primary nids.
836 * This is safe because the peer lists are only modified
837 * while the ln_api_mutex is held. So we don't need to
838 * hold the lnet_net_lock as well, and can therefore
839 * directly call copy_to_user().
842 memset(&id, 0, sizeof(id));
843 id.pid = LNET_PID_LUSTRE;
845 for (cpt = 0; cpt < lncpt; cpt++) {
846 ptable = the_lnet.ln_peer_tables[cpt];
847 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
850 id.nid = lp->lp_primary_nid;
851 if (copy_to_user(&ids[i], &id, sizeof(id)))
864 * Start pushes to peers that need to be updated for a configuration
865 * change on this node.
868 lnet_push_update_to_peers(int force)
870 struct lnet_peer_table *ptable;
871 struct lnet_peer *lp;
875 lnet_net_lock(LNET_LOCK_EX);
876 if (lnet_peer_discovery_disabled)
878 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
879 for (cpt = 0; cpt < lncpt; cpt++) {
880 ptable = the_lnet.ln_peer_tables[cpt];
881 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
883 spin_lock(&lp->lp_lock);
884 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
885 lp->lp_state |= LNET_PEER_FORCE_PUSH;
886 spin_unlock(&lp->lp_lock);
888 if (lnet_peer_needs_push(lp))
889 lnet_peer_queue_for_discovery(lp);
892 lnet_net_unlock(LNET_LOCK_EX);
893 wake_up(&the_lnet.ln_dc_waitq);
897 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
898 * this is a preferred point-to-point path. Call with lnet_net_lock in
902 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
906 if (lpni->lpni_pref_nnids == 0)
908 if (lpni->lpni_pref_nnids == 1)
909 return lpni->lpni_pref.nid == nid;
910 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
911 if (lpni->lpni_pref.nids[i] == nid)
918 * Set a single ni as preferred, provided no preferred ni is already
919 * defined. Only to be used for non-multi-rail peer_ni.
922 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
926 spin_lock(&lpni->lpni_lock);
927 if (nid == LNET_NID_ANY) {
929 } else if (lpni->lpni_pref_nnids > 0) {
931 } else if (lpni->lpni_pref_nnids == 0) {
932 lpni->lpni_pref.nid = nid;
933 lpni->lpni_pref_nnids = 1;
934 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
936 spin_unlock(&lpni->lpni_lock);
938 CDEBUG(D_NET, "peer %s nid %s: %d\n",
939 libcfs_nid2str(lpni->lpni_nid), libcfs_nid2str(nid), rc);
944 * Clear the preferred NID from a non-multi-rail peer_ni, provided
945 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
948 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
952 spin_lock(&lpni->lpni_lock);
953 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
954 lpni->lpni_pref_nnids = 0;
955 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
956 } else if (lpni->lpni_pref_nnids == 0) {
961 spin_unlock(&lpni->lpni_lock);
963 CDEBUG(D_NET, "peer %s: %d\n",
964 libcfs_nid2str(lpni->lpni_nid), rc);
969 * Clear the preferred NIDs from a non-multi-rail peer.
972 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
974 struct lnet_peer_ni *lpni = NULL;
976 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
977 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
981 lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
983 lnet_nid_t *nids = NULL;
984 lnet_nid_t *oldnids = NULL;
985 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
990 if (nid == LNET_NID_ANY) {
995 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
1000 /* A non-MR node may have only one preferred NI per peer_ni */
1001 if (lpni->lpni_pref_nnids > 0) {
1002 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1008 if (lpni->lpni_pref_nnids != 0) {
1009 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1010 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1015 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
1016 if (lpni->lpni_pref.nids[i] == nid) {
1017 LIBCFS_FREE(nids, size);
1021 nids[i] = lpni->lpni_pref.nids[i];
1026 lnet_net_lock(LNET_LOCK_EX);
1027 spin_lock(&lpni->lpni_lock);
1028 if (lpni->lpni_pref_nnids == 0) {
1029 lpni->lpni_pref.nid = nid;
1031 oldnids = lpni->lpni_pref.nids;
1032 lpni->lpni_pref.nids = nids;
1034 lpni->lpni_pref_nnids++;
1035 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1036 spin_unlock(&lpni->lpni_lock);
1037 lnet_net_unlock(LNET_LOCK_EX);
1040 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1041 CFS_FREE_PTR_ARRAY(oldnids, size);
1044 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
1045 spin_lock(&lpni->lpni_lock);
1046 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1047 spin_unlock(&lpni->lpni_lock);
1049 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1050 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1055 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1057 lnet_nid_t *nids = NULL;
1058 lnet_nid_t *oldnids = NULL;
1059 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1064 if (lpni->lpni_pref_nnids == 0) {
1069 if (lpni->lpni_pref_nnids == 1) {
1070 if (lpni->lpni_pref.nid != nid) {
1074 } else if (lpni->lpni_pref_nnids == 2) {
1075 if (lpni->lpni_pref.nids[0] != nid &&
1076 lpni->lpni_pref.nids[1] != nid) {
1081 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1082 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1087 for (i = 0, j = 0; i < lpni->lpni_pref_nnids; i++) {
1088 if (lpni->lpni_pref.nids[i] != nid)
1090 nids[j++] = lpni->lpni_pref.nids[i];
1092 /* Check if we actually removed a nid. */
1093 if (j == lpni->lpni_pref_nnids) {
1094 LIBCFS_FREE(nids, size);
1100 lnet_net_lock(LNET_LOCK_EX);
1101 spin_lock(&lpni->lpni_lock);
1102 if (lpni->lpni_pref_nnids == 1) {
1103 lpni->lpni_pref.nid = LNET_NID_ANY;
1104 } else if (lpni->lpni_pref_nnids == 2) {
1105 oldnids = lpni->lpni_pref.nids;
1106 if (oldnids[0] == nid)
1107 lpni->lpni_pref.nid = oldnids[1];
1109 lpni->lpni_pref.nid = oldnids[2];
1111 oldnids = lpni->lpni_pref.nids;
1112 lpni->lpni_pref.nids = nids;
1114 lpni->lpni_pref_nnids--;
1115 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1116 spin_unlock(&lpni->lpni_lock);
1117 lnet_net_unlock(LNET_LOCK_EX);
1120 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1121 CFS_FREE_PTR_ARRAY(oldnids, size);
1124 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1125 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1130 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1132 struct lnet_peer_ni *lpni;
1133 lnet_nid_t primary_nid = nid;
1135 lpni = lnet_find_peer_ni_locked(nid);
1137 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
1138 lnet_peer_ni_decref_locked(lpni);
1145 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1146 __must_hold(&lp->lp_lock)
1148 if (lnet_peer_discovery_disabled)
1151 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1152 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1163 lnet_is_discovery_disabled(struct lnet_peer *lp)
1167 spin_lock(&lp->lp_lock);
1168 rc = lnet_is_discovery_disabled_locked(lp);
1169 spin_unlock(&lp->lp_lock);
1175 LNetPrimaryNID(lnet_nid_t nid)
1177 struct lnet_peer *lp;
1178 struct lnet_peer_ni *lpni;
1179 lnet_nid_t primary_nid = nid;
1183 cpt = lnet_net_lock_current();
1184 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1189 lp = lpni->lpni_peer_net->lpn_peer;
1191 while (!lnet_peer_is_uptodate(lp)) {
1192 rc = lnet_discover_peer_locked(lpni, cpt, true);
1195 lp = lpni->lpni_peer_net->lpn_peer;
1197 /* Only try once if discovery is disabled */
1198 if (lnet_is_discovery_disabled(lp))
1201 primary_nid = lp->lp_primary_nid;
1203 lnet_peer_ni_decref_locked(lpni);
1205 lnet_net_unlock(cpt);
1207 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1208 libcfs_nid2str(primary_nid), rc);
1211 EXPORT_SYMBOL(LNetPrimaryNID);
1213 struct lnet_peer_net *
1214 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1216 struct lnet_peer_net *peer_net;
1217 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1218 if (peer_net->lpn_net_id == net_id)
1225 * Attach a peer_ni to a peer_net and peer. This function assumes
1226 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1227 * may be attached to a different peer, in which case it will be
1228 * properly detached first. The whole operation is done atomically.
1230 * Always returns 0. This is the last function called from functions
1231 * that do return an int, so returning 0 here allows the compiler to
1235 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1236 struct lnet_peer_net *lpn,
1237 struct lnet_peer_ni *lpni,
1240 struct lnet_peer_table *ptable;
1242 /* Install the new peer_ni */
1243 lnet_net_lock(LNET_LOCK_EX);
1244 /* Add peer_ni to global peer table hash, if necessary. */
1245 if (list_empty(&lpni->lpni_hashlist)) {
1246 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1248 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1249 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1250 ptable->pt_version++;
1251 /* This is the 1st refcount on lpni. */
1252 atomic_inc(&lpni->lpni_refcount);
1255 /* Detach the peer_ni from an existing peer, if necessary. */
1256 if (lpni->lpni_peer_net) {
1257 LASSERT(lpni->lpni_peer_net != lpn);
1258 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1259 lnet_peer_detach_peer_ni_locked(lpni);
1260 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1261 lpni->lpni_peer_net = NULL;
1264 /* Add peer_ni to peer_net */
1265 lpni->lpni_peer_net = lpn;
1266 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1267 lnet_update_peer_net_healthv(lpni);
1268 lnet_peer_net_addref_locked(lpn);
1270 /* Add peer_net to peer */
1271 if (!lpn->lpn_peer) {
1273 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1274 lnet_peer_addref_locked(lp);
1277 /* Add peer to global peer list, if necessary */
1278 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1279 if (list_empty(&lp->lp_peer_list)) {
1280 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1285 /* Update peer state */
1286 spin_lock(&lp->lp_lock);
1287 if (flags & LNET_PEER_CONFIGURED) {
1288 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1289 lp->lp_state |= LNET_PEER_CONFIGURED;
1291 if (flags & LNET_PEER_MULTI_RAIL) {
1292 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1293 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1294 lnet_peer_clr_non_mr_pref_nids(lp);
1297 spin_unlock(&lp->lp_lock);
1300 lnet_net_unlock(LNET_LOCK_EX);
1302 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1303 libcfs_nid2str(lp->lp_primary_nid),
1304 libcfs_nid2str(lpni->lpni_nid), flags);
1310 * Create a new peer, with nid as its primary nid.
1312 * Call with the lnet_api_mutex held.
1315 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1317 struct lnet_peer *lp;
1318 struct lnet_peer_net *lpn;
1319 struct lnet_peer_ni *lpni;
1322 LASSERT(nid != LNET_NID_ANY);
1325 * No need for the lnet_net_lock here, because the
1326 * lnet_api_mutex is held.
1328 lpni = lnet_find_peer_ni_locked(nid);
1330 /* A peer with this NID already exists. */
1331 lp = lpni->lpni_peer_net->lpn_peer;
1332 lnet_peer_ni_decref_locked(lpni);
1334 * This is an error if the peer was configured and the
1335 * primary NID differs or an attempt is made to change
1336 * the Multi-Rail flag. Otherwise the assumption is
1337 * that an existing peer is being modified.
1339 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1340 if (lp->lp_primary_nid != nid)
1342 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1346 /* Delete and recreate as a configured peer. */
1350 /* Create peer, peer_net, and peer_ni. */
1352 lp = lnet_peer_alloc(nid);
1355 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1358 lpni = lnet_peer_ni_alloc(nid);
1362 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1365 LIBCFS_FREE(lpn, sizeof(*lpn));
1367 LIBCFS_FREE(lp, sizeof(*lp));
1369 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1370 libcfs_nid2str(nid), flags, rc);
1375 * Add a NID to a peer. Call with ln_api_mutex held.
1378 * -EPERM: Non-DLC addition to a DLC-configured peer.
1379 * -EEXIST: The NID was configured by DLC for a different peer.
1380 * -ENOMEM: Out of memory.
1381 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1382 * non-multi-rail peer.
1385 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1387 struct lnet_peer_net *lpn;
1388 struct lnet_peer_ni *lpni;
1392 LASSERT(nid != LNET_NID_ANY);
1394 /* A configured peer can only be updated through configuration. */
1395 if (!(flags & LNET_PEER_CONFIGURED)) {
1396 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1403 * The MULTI_RAIL flag can be set but not cleared, because
1404 * that would leave the peer struct in an invalid state.
1406 if (flags & LNET_PEER_MULTI_RAIL) {
1407 spin_lock(&lp->lp_lock);
1408 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1409 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1410 lnet_peer_clr_non_mr_pref_nids(lp);
1412 spin_unlock(&lp->lp_lock);
1413 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1418 lpni = lnet_find_peer_ni_locked(nid);
1421 * A peer_ni already exists. This is only a problem if
1422 * it is not connected to this peer and was configured
1425 lnet_peer_ni_decref_locked(lpni);
1426 if (lpni->lpni_peer_net->lpn_peer == lp)
1428 if (lnet_peer_ni_is_configured(lpni)) {
1432 /* If this is the primary NID, destroy the peer. */
1433 if (lnet_peer_ni_is_primary(lpni)) {
1434 struct lnet_peer *rtr_lp =
1435 lpni->lpni_peer_net->lpn_peer;
1436 int rtr_refcount = rtr_lp->lp_rtr_refcount;
1438 * if we're trying to delete a router it means
1439 * we're moving this peer NI to a new peer so must
1440 * transfer router properties to the new peer
1442 if (rtr_refcount > 0) {
1443 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1444 lnet_rtr_transfer_to_peer(rtr_lp, lp);
1446 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1447 lpni = lnet_peer_ni_alloc(nid);
1454 lpni = lnet_peer_ni_alloc(nid);
1462 * Get the peer_net. Check that we're not adding a second
1463 * peer_ni on a peer_net of a non-multi-rail peer.
1465 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1467 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1472 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1477 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1480 /* If the peer_ni was allocated above its peer_net pointer is NULL */
1481 if (!lpni->lpni_peer_net)
1482 LIBCFS_FREE(lpni, sizeof(*lpni));
1484 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1485 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1491 * Update the primary NID of a peer, if possible.
1493 * Call with the lnet_api_mutex held.
1496 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1498 lnet_nid_t old = lp->lp_primary_nid;
1501 if (lp->lp_primary_nid == nid)
1503 rc = lnet_peer_add_nid(lp, nid, flags);
1506 lp->lp_primary_nid = nid;
1508 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1509 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1514 * lpni creation initiated due to traffic either sending or receiving.
1517 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1519 struct lnet_peer *lp;
1520 struct lnet_peer_net *lpn;
1521 struct lnet_peer_ni *lpni;
1525 if (nid == LNET_NID_ANY) {
1530 /* lnet_net_lock is not needed here because ln_api_lock is held */
1531 lpni = lnet_find_peer_ni_locked(nid);
1534 * We must have raced with another thread. Since we
1535 * know next to nothing about a peer_ni created by
1536 * traffic, we just assume everything is ok and
1539 lnet_peer_ni_decref_locked(lpni);
1543 /* Create peer, peer_net, and peer_ni. */
1545 lp = lnet_peer_alloc(nid);
1548 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1551 lpni = lnet_peer_ni_alloc(nid);
1554 if (pref != LNET_NID_ANY)
1555 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1557 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1560 LIBCFS_FREE(lpn, sizeof(*lpn));
1562 LIBCFS_FREE(lp, sizeof(*lp));
1564 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1569 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1571 * This API handles the following combinations:
1572 * Create a peer with its primary NI if only the prim_nid is provided
1573 * Add a NID to a peer identified by the prim_nid. The peer identified
1574 * by the prim_nid must already exist.
1575 * The peer being created may be non-MR.
1577 * The caller must hold ln_api_mutex. This prevents the peer from
1578 * being created/modified/deleted by a different thread.
1581 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1583 struct lnet_peer *lp = NULL;
1584 struct lnet_peer_ni *lpni;
1587 /* The prim_nid must always be specified */
1588 if (prim_nid == LNET_NID_ANY)
1591 flags = LNET_PEER_CONFIGURED;
1593 flags |= LNET_PEER_MULTI_RAIL;
1596 * If nid isn't specified, we must create a new peer with
1597 * prim_nid as its primary nid.
1599 if (nid == LNET_NID_ANY)
1600 return lnet_peer_add(prim_nid, flags);
1602 /* Look up the prim_nid, which must exist. */
1603 lpni = lnet_find_peer_ni_locked(prim_nid);
1606 lnet_peer_ni_decref_locked(lpni);
1607 lp = lpni->lpni_peer_net->lpn_peer;
1609 /* Peer must have been configured. */
1610 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1611 CDEBUG(D_NET, "peer %s was not configured\n",
1612 libcfs_nid2str(prim_nid));
1616 /* Primary NID must match */
1617 if (lp->lp_primary_nid != prim_nid) {
1618 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1619 libcfs_nid2str(prim_nid),
1620 libcfs_nid2str(lp->lp_primary_nid));
1624 /* Multi-Rail flag must match. */
1625 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1626 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1627 libcfs_nid2str(prim_nid));
1631 return lnet_peer_add_nid(lp, nid, flags);
1635 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1637 * This API handles the following combinations:
1638 * Delete a NI from a peer if both prim_nid and nid are provided.
1639 * Delete a peer if only prim_nid is provided.
1640 * Delete a peer if its primary nid is provided.
1642 * The caller must hold ln_api_mutex. This prevents the peer from
1643 * being modified/deleted by a different thread.
1646 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1648 struct lnet_peer *lp;
1649 struct lnet_peer_ni *lpni;
1652 if (prim_nid == LNET_NID_ANY)
1655 lpni = lnet_find_peer_ni_locked(prim_nid);
1658 lnet_peer_ni_decref_locked(lpni);
1659 lp = lpni->lpni_peer_net->lpn_peer;
1661 if (prim_nid != lp->lp_primary_nid) {
1662 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1663 libcfs_nid2str(prim_nid),
1664 libcfs_nid2str(lp->lp_primary_nid));
1668 lnet_net_lock(LNET_LOCK_EX);
1669 if (lp->lp_rtr_refcount > 0) {
1670 lnet_net_unlock(LNET_LOCK_EX);
1671 CERROR("%s is a router. Can not be deleted\n",
1672 libcfs_nid2str(prim_nid));
1675 lnet_net_unlock(LNET_LOCK_EX);
1677 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1678 return lnet_peer_del(lp);
1680 flags = LNET_PEER_CONFIGURED;
1681 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1682 flags |= LNET_PEER_MULTI_RAIL;
1684 return lnet_peer_del_nid(lp, nid, flags);
1688 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
1690 struct lnet_peer_table *ptable;
1691 struct lnet_peer_net *lpn;
1693 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1695 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
1696 LASSERT(list_empty(&lpni->lpni_txq));
1697 LASSERT(lpni->lpni_txqnob == 0);
1698 LASSERT(list_empty(&lpni->lpni_peer_nis));
1699 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1701 lpn = lpni->lpni_peer_net;
1702 lpni->lpni_peer_net = NULL;
1703 lpni->lpni_net = NULL;
1705 /* remove the peer ni from the zombie list */
1706 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1707 spin_lock(&ptable->pt_zombie_lock);
1708 list_del_init(&lpni->lpni_hashlist);
1709 ptable->pt_zombies--;
1710 spin_unlock(&ptable->pt_zombie_lock);
1712 if (lpni->lpni_pref_nnids > 1)
1713 CFS_FREE_PTR_ARRAY(lpni->lpni_pref.nids, lpni->lpni_pref_nnids);
1715 LIBCFS_FREE(lpni, sizeof(*lpni));
1717 lnet_peer_net_decref_locked(lpn);
1720 struct lnet_peer_ni *
1721 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1723 struct lnet_peer_ni *lpni = NULL;
1726 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1727 return ERR_PTR(-ESHUTDOWN);
1730 * find if a peer_ni already exists.
1731 * If so then just return that.
1733 lpni = lnet_find_peer_ni_locked(nid);
1737 lnet_net_unlock(cpt);
1739 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1742 goto out_net_relock;
1745 lpni = lnet_find_peer_ni_locked(nid);
1755 * Get a peer_ni for the given nid, create it if necessary. Takes a
1756 * hold on the peer_ni.
1758 struct lnet_peer_ni *
1759 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1761 struct lnet_peer_ni *lpni = NULL;
1764 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1765 return ERR_PTR(-ESHUTDOWN);
1768 * find if a peer_ni already exists.
1769 * If so then just return that.
1771 lpni = lnet_find_peer_ni_locked(nid);
1777 * use the lnet_api_mutex to serialize the creation of the peer_ni
1778 * and the creation/deletion of the local ni/net. When a local ni is
1779 * created, if there exists a set of peer_nis on that network,
1780 * they need to be traversed and updated. When a local NI is
1781 * deleted, which could result in a network being deleted, then
1782 * all peer nis on that network need to be removed as well.
1784 * Creation through traffic should also be serialized with
1785 * creation through DLC.
1787 lnet_net_unlock(cpt);
1788 mutex_lock(&the_lnet.ln_api_mutex);
1790 * Shutdown is only set under the ln_api_lock, so a single
1791 * check here is sufficent.
1793 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1794 lpni = ERR_PTR(-ESHUTDOWN);
1795 goto out_mutex_unlock;
1798 rc = lnet_peer_ni_traffic_add(nid, pref);
1801 goto out_mutex_unlock;
1804 lpni = lnet_find_peer_ni_locked(nid);
1808 mutex_unlock(&the_lnet.ln_api_mutex);
1811 /* Lock has been dropped, check again for shutdown. */
1812 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1814 lnet_peer_ni_decref_locked(lpni);
1815 lpni = ERR_PTR(-ESHUTDOWN);
1822 lnet_peer_gw_discovery(struct lnet_peer *lp)
1826 spin_lock(&lp->lp_lock);
1827 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
1829 spin_unlock(&lp->lp_lock);
1835 lnet_peer_is_uptodate(struct lnet_peer *lp)
1839 spin_lock(&lp->lp_lock);
1840 rc = lnet_peer_is_uptodate_locked(lp);
1841 spin_unlock(&lp->lp_lock);
1846 * Is a peer uptodate from the point of view of discovery?
1848 * If it is currently being processed, obviously not.
1849 * A forced Ping or Push is also handled by the discovery thread.
1851 * Otherwise look at whether the peer needs rediscovering.
1854 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
1855 __must_hold(&lp->lp_lock)
1859 if (lp->lp_state & (LNET_PEER_DISCOVERING |
1860 LNET_PEER_FORCE_PING |
1861 LNET_PEER_FORCE_PUSH)) {
1863 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
1865 } else if (lnet_peer_needs_push(lp)) {
1867 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
1868 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
1880 * Queue a peer for the attention of the discovery thread. Call with
1881 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
1882 * -EALREADY if the peer was already queued.
1884 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
1888 spin_lock(&lp->lp_lock);
1889 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
1890 lp->lp_state |= LNET_PEER_DISCOVERING;
1891 spin_unlock(&lp->lp_lock);
1892 if (list_empty(&lp->lp_dc_list)) {
1893 lnet_peer_addref_locked(lp);
1894 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
1895 wake_up(&the_lnet.ln_dc_waitq);
1901 CDEBUG(D_NET, "Queue peer %s: %d\n",
1902 libcfs_nid2str(lp->lp_primary_nid), rc);
1908 * Discovery of a peer is complete. Wake all waiters on the peer.
1909 * Call with lnet_net_lock/EX held.
1911 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
1913 struct lnet_msg *msg, *tmp;
1915 LIST_HEAD(pending_msgs);
1917 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
1918 libcfs_nid2str(lp->lp_primary_nid));
1920 list_del_init(&lp->lp_dc_list);
1921 spin_lock(&lp->lp_lock);
1922 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
1923 spin_unlock(&lp->lp_lock);
1924 wake_up_all(&lp->lp_dc_waitq);
1926 if (lp->lp_rtr_refcount > 0)
1927 lnet_router_discovery_complete(lp);
1929 lnet_net_unlock(LNET_LOCK_EX);
1931 /* iterate through all pending messages and send them again */
1932 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
1933 list_del_init(&msg->msg_list);
1934 if (lp->lp_dc_error) {
1935 lnet_finalize(msg, lp->lp_dc_error);
1939 CDEBUG(D_NET, "sending pending message %s to target %s\n",
1940 lnet_msgtyp2str(msg->msg_type),
1941 libcfs_id2str(msg->msg_target));
1942 rc = lnet_send(msg->msg_src_nid_param, msg,
1943 msg->msg_rtr_nid_param);
1945 CNETERR("Error sending %s to %s: %d\n",
1946 lnet_msgtyp2str(msg->msg_type),
1947 libcfs_id2str(msg->msg_target), rc);
1948 lnet_finalize(msg, rc);
1951 lnet_net_lock(LNET_LOCK_EX);
1952 lnet_peer_decref_locked(lp);
1956 * Handle inbound push.
1957 * Like any event handler, called with lnet_res_lock/CPT held.
1959 void lnet_peer_push_event(struct lnet_event *ev)
1961 struct lnet_ping_buffer *pbuf;
1962 struct lnet_peer *lp;
1964 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start + ev->offset);
1966 /* lnet_find_peer() adds a refcount */
1967 lp = lnet_find_peer(ev->source.nid);
1969 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
1970 libcfs_nid2str(ev->initiator.nid),
1971 libcfs_nid2str(ev->source.nid));
1972 pbuf->pb_needs_post = true;
1976 /* Ensure peer state remains consistent while we modify it. */
1977 spin_lock(&lp->lp_lock);
1980 * If some kind of error happened the contents of the message
1981 * cannot be used. Clear the NIDS_UPTODATE and set the
1982 * FORCE_PING flag to trigger a ping.
1985 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1986 lp->lp_state |= LNET_PEER_FORCE_PING;
1987 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
1989 libcfs_nid2str(lp->lp_primary_nid),
1990 libcfs_nid2str(ev->source.nid));
1995 * A push with invalid or corrupted info. Clear the UPTODATE
1996 * flag to trigger a ping.
1998 if (lnet_ping_info_validate(&pbuf->pb_info)) {
1999 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2000 lp->lp_state |= LNET_PEER_FORCE_PING;
2001 CDEBUG(D_NET, "Corrupted Push from %s\n",
2002 libcfs_nid2str(lp->lp_primary_nid));
2007 * Make sure we'll allocate the correct size ping buffer when
2010 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2011 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2014 * A non-Multi-Rail peer is not supposed to be capable of
2017 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2018 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2019 libcfs_nid2str(lp->lp_primary_nid));
2024 * The peer may have discovery disabled at its end. Set
2025 * NO_DISCOVERY as appropriate.
2027 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2028 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2029 libcfs_nid2str(lp->lp_primary_nid));
2031 * If the peer is going from discovery enabled to
2032 * discovery disabled, we need to reflect that in our
2033 * representation of the peer.
2035 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2036 lp->lp_state |= LNET_PEER_MARK_DELETION;
2037 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2038 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2039 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2040 libcfs_nid2str(lp->lp_primary_nid));
2041 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2045 * Update the MULTI_RAIL flag based on the push. If the peer
2046 * was configured with DLC then the setting should match what
2048 * NB: We verified above that the MR feature bit is set in pi_features
2050 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2051 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2052 libcfs_nid2str(lp->lp_primary_nid), lp);
2053 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2054 CWARN("Push says %s is Multi-Rail, DLC says not\n",
2055 libcfs_nid2str(lp->lp_primary_nid));
2056 } else if (lnet_peer_discovery_disabled) {
2057 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled locally\n",
2058 libcfs_nid2str(lp->lp_primary_nid), lp);
2059 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2060 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled remotely\n",
2061 libcfs_nid2str(lp->lp_primary_nid), lp);
2063 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2064 libcfs_nid2str(lp->lp_primary_nid), lp);
2065 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2066 lnet_peer_clr_non_mr_pref_nids(lp);
2070 * Check for truncation of the Put message. Clear the
2071 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2072 * and tell discovery to allocate a bigger buffer.
2074 if (ev->mlength < ev->rlength) {
2075 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2076 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2077 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2078 lp->lp_state |= LNET_PEER_FORCE_PING;
2079 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2080 libcfs_nid2str(lp->lp_primary_nid),
2081 pbuf->pb_info.pi_nnis);
2085 /* always assume new data */
2086 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2087 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2090 * If there is data present that hasn't been processed yet,
2091 * we'll replace it if the Put contained newer data and it
2092 * fits. We're racing with a Ping or earlier Push in this
2095 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2096 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2097 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2098 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2099 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2100 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2101 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2102 libcfs_nid2str(lp->lp_primary_nid),
2103 LNET_PING_BUFFER_SEQNO(pbuf),
2104 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2110 * Allocate a buffer to copy the data. On a failure we drop
2111 * the Push and set FORCE_PING to force the discovery
2112 * thread to fix the problem by pinging the peer.
2114 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2116 lp->lp_state |= LNET_PEER_FORCE_PING;
2117 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2118 libcfs_nid2str(lp->lp_primary_nid),
2119 LNET_PING_BUFFER_SEQNO(pbuf));
2124 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2125 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2126 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2127 CDEBUG(D_NET, "Received Push %s %u\n",
2128 libcfs_nid2str(lp->lp_primary_nid),
2129 LNET_PING_BUFFER_SEQNO(pbuf));
2132 /* We've processed this buffer. It can be reposted */
2133 pbuf->pb_needs_post = true;
2136 * Queue the peer for discovery if not done, force it on the request
2137 * queue and wake the discovery thread if the peer was already queued,
2138 * because its status changed.
2140 spin_unlock(&lp->lp_lock);
2141 lnet_net_lock(LNET_LOCK_EX);
2142 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2143 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2144 wake_up(&the_lnet.ln_dc_waitq);
2146 /* Drop refcount from lookup */
2147 lnet_peer_decref_locked(lp);
2148 lnet_net_unlock(LNET_LOCK_EX);
2152 * Clear the discovery error state, unless we're already discovering
2153 * this peer, in which case the error is current.
2155 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2157 spin_lock(&lp->lp_lock);
2158 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2159 lp->lp_dc_error = 0;
2160 spin_unlock(&lp->lp_lock);
2164 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2165 * dropped/retaken within this function. An lnet_peer_ni is passed in
2166 * because discovery could tear down an lnet_peer.
2169 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2172 struct lnet_peer *lp;
2177 lnet_net_unlock(cpt);
2178 lnet_net_lock(LNET_LOCK_EX);
2179 lp = lpni->lpni_peer_net->lpn_peer;
2180 lnet_peer_clear_discovery_error(lp);
2183 * We're willing to be interrupted. The lpni can become a
2184 * zombie if we race with DLC, so we must check for that.
2187 /* Keep lp alive when the lnet_net_lock is unlocked */
2188 lnet_peer_addref_locked(lp);
2189 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2190 if (signal_pending(current))
2192 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2195 * Don't repeat discovery if discovery is disabled. This is
2196 * done to ensure we can use discovery as a standard ping as
2197 * well for backwards compatibility with routers which do not
2198 * have discovery or have discovery disabled
2200 if (lnet_is_discovery_disabled(lp) && count > 0)
2202 if (lp->lp_dc_error)
2204 if (lnet_peer_is_uptodate(lp))
2206 lnet_peer_queue_for_discovery(lp);
2208 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2211 * If caller requested a non-blocking operation then
2212 * return immediately. Once discovery is complete any
2213 * pending messages that were stopped due to discovery
2214 * will be transmitted.
2219 lnet_net_unlock(LNET_LOCK_EX);
2221 finish_wait(&lp->lp_dc_waitq, &wait);
2222 lnet_net_lock(LNET_LOCK_EX);
2223 lnet_peer_decref_locked(lp);
2224 /* Peer may have changed */
2225 lp = lpni->lpni_peer_net->lpn_peer;
2227 finish_wait(&lp->lp_dc_waitq, &wait);
2229 lnet_net_unlock(LNET_LOCK_EX);
2231 lnet_peer_decref_locked(lp);
2233 * The peer may have changed, so re-check and rediscover if that turns
2234 * out to have been the case. The reference count on lp ensured that
2235 * even if it was unlinked from lpni the memory could not be recycled.
2236 * Thus the check below is sufficient to determine whether the peer
2237 * changed. If the peer changed, then lp must not be dereferenced.
2239 if (lp != lpni->lpni_peer_net->lpn_peer)
2242 if (signal_pending(current))
2244 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2246 else if (lp->lp_dc_error)
2247 rc = lp->lp_dc_error;
2249 CDEBUG(D_NET, "non-blocking discovery\n");
2250 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2253 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2254 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2255 libcfs_nid2str(lpni->lpni_nid), rc,
2256 (!block) ? "pending discovery" : "discovery complete");
2261 /* Handle an incoming ack for a push. */
2263 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2265 struct lnet_ping_buffer *pbuf;
2267 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2268 spin_lock(&lp->lp_lock);
2269 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2270 lp->lp_push_error = ev->status;
2272 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2274 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2275 spin_unlock(&lp->lp_lock);
2277 CDEBUG(D_NET, "peer %s ev->status %d\n",
2278 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2281 /* Handle a Reply message. This is the reply to a Ping message. */
2283 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2285 struct lnet_ping_buffer *pbuf;
2288 spin_lock(&lp->lp_lock);
2291 * If some kind of error happened the contents of message
2292 * cannot be used. Set PING_FAILED to trigger a retry.
2295 lp->lp_state |= LNET_PEER_PING_FAILED;
2296 lp->lp_ping_error = ev->status;
2297 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2299 libcfs_nid2str(lp->lp_primary_nid),
2300 libcfs_nid2str(ev->source.nid));
2304 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md.start);
2305 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2306 lnet_swap_pinginfo(pbuf);
2309 * A reply with invalid or corrupted info. Set PING_FAILED to
2312 rc = lnet_ping_info_validate(&pbuf->pb_info);
2314 lp->lp_state |= LNET_PEER_PING_FAILED;
2315 lp->lp_ping_error = 0;
2316 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2317 libcfs_nid2str(lp->lp_primary_nid), rc);
2323 * The peer may have discovery disabled at its end. Set
2324 * NO_DISCOVERY as appropriate.
2326 if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) &&
2327 !lnet_peer_discovery_disabled) {
2328 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2329 libcfs_nid2str(lp->lp_primary_nid));
2330 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2332 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2333 libcfs_nid2str(lp->lp_primary_nid));
2335 * If the peer is going from discovery enabled to
2336 * discovery disabled, we need to reflect that in our
2337 * representation of the peer.
2339 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2340 lp->lp_state |= LNET_PEER_MARK_DELETION;
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 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2352 libcfs_nid2str(lp->lp_primary_nid), lp);
2353 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2354 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2355 libcfs_nid2str(lp->lp_primary_nid));
2356 } else if (lnet_peer_discovery_disabled) {
2358 "peer %s(%p) not MR: DD disabled locally\n",
2359 libcfs_nid2str(lp->lp_primary_nid), lp);
2360 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2362 "peer %s(%p) not MR: DD disabled remotely\n",
2363 libcfs_nid2str(lp->lp_primary_nid), lp);
2365 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2366 libcfs_nid2str(lp->lp_primary_nid), lp);
2367 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2368 lnet_peer_clr_non_mr_pref_nids(lp);
2370 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2371 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2372 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2373 libcfs_nid2str(lp->lp_primary_nid));
2375 CERROR("Multi-Rail state vanished from %s\n",
2376 libcfs_nid2str(lp->lp_primary_nid));
2377 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2382 * Make sure we'll allocate the correct size ping buffer when
2385 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2386 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2389 * Check for truncation of the Reply. Clear PING_SENT and set
2390 * PING_FAILED to trigger a retry.
2392 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2393 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2394 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2395 lp->lp_state |= LNET_PEER_PING_FAILED;
2396 lp->lp_ping_error = 0;
2397 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2398 libcfs_nid2str(lp->lp_primary_nid),
2399 pbuf->pb_info.pi_nnis);
2404 * Check the sequence numbers in the reply. These are only
2405 * available if the reply came from a Multi-Rail peer.
2407 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2408 pbuf->pb_info.pi_nnis > 1 &&
2409 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2410 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2411 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2412 libcfs_nid2str(lp->lp_primary_nid),
2413 LNET_PING_BUFFER_SEQNO(pbuf),
2416 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2419 /* We're happy with the state of the data in the buffer. */
2420 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2421 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno, lp->lp_state);
2422 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2423 lnet_ping_buffer_decref(lp->lp_data);
2425 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2426 lnet_ping_buffer_addref(pbuf);
2429 lp->lp_state &= ~LNET_PEER_PING_SENT;
2430 spin_unlock(&lp->lp_lock);
2432 lnet_net_lock(LNET_LOCK_EX);
2434 * If this peer is a gateway, call the routing callback to
2435 * handle the ping reply
2437 if (lp->lp_rtr_refcount > 0)
2438 lnet_router_discovery_ping_reply(lp);
2439 lnet_net_unlock(LNET_LOCK_EX);
2443 * Send event handling. Only matters for error cases, where we clean
2444 * up state on the peer and peer_ni that would otherwise be updated in
2445 * the REPLY event handler for a successful Ping, and the ACK event
2446 * handler for a successful Push.
2449 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2456 spin_lock(&lp->lp_lock);
2457 if (ev->msg_type == LNET_MSG_GET) {
2458 lp->lp_state &= ~LNET_PEER_PING_SENT;
2459 lp->lp_state |= LNET_PEER_PING_FAILED;
2460 lp->lp_ping_error = ev->status;
2461 } else { /* ev->msg_type == LNET_MSG_PUT */
2462 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2463 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2464 lp->lp_push_error = ev->status;
2466 spin_unlock(&lp->lp_lock);
2467 rc = LNET_REDISCOVER_PEER;
2469 CDEBUG(D_NET, "%s Send to %s: %d\n",
2470 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2471 libcfs_nid2str(ev->target.nid), rc);
2476 * Unlink event handling. This event is only seen if a call to
2477 * LNetMDUnlink() caused the event to be unlinked. If this call was
2478 * made after the event was set up in LNetGet() or LNetPut() then we
2479 * assume the Ping or Push timed out.
2482 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2484 spin_lock(&lp->lp_lock);
2485 /* We've passed through LNetGet() */
2486 if (lp->lp_state & LNET_PEER_PING_SENT) {
2487 lp->lp_state &= ~LNET_PEER_PING_SENT;
2488 lp->lp_state |= LNET_PEER_PING_FAILED;
2489 lp->lp_ping_error = -ETIMEDOUT;
2490 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2491 libcfs_nid2str(lp->lp_primary_nid));
2493 /* We've passed through LNetPut() */
2494 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2495 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2496 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2497 lp->lp_push_error = -ETIMEDOUT;
2498 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2499 libcfs_nid2str(lp->lp_primary_nid));
2501 spin_unlock(&lp->lp_lock);
2505 * Event handler for the discovery EQ.
2507 * Called with lnet_res_lock(cpt) held. The cpt is the
2508 * lnet_cpt_of_cookie() of the md handle cookie.
2510 static void lnet_discovery_event_handler(struct lnet_event *event)
2512 struct lnet_peer *lp = event->md.user_ptr;
2513 struct lnet_ping_buffer *pbuf;
2516 /* discovery needs to take another look */
2517 rc = LNET_REDISCOVER_PEER;
2519 CDEBUG(D_NET, "Received event: %d\n", event->type);
2521 switch (event->type) {
2522 case LNET_EVENT_ACK:
2523 lnet_discovery_event_ack(lp, event);
2525 case LNET_EVENT_REPLY:
2526 lnet_discovery_event_reply(lp, event);
2528 case LNET_EVENT_SEND:
2529 /* Only send failure triggers a retry. */
2530 rc = lnet_discovery_event_send(lp, event);
2532 case LNET_EVENT_UNLINK:
2533 /* LNetMDUnlink() was called */
2534 lnet_discovery_event_unlink(lp, event);
2537 /* Invalid events. */
2540 lnet_net_lock(LNET_LOCK_EX);
2541 if (event->unlinked) {
2542 pbuf = LNET_PING_INFO_TO_BUFFER(event->md.start);
2543 lnet_ping_buffer_decref(pbuf);
2544 lnet_peer_decref_locked(lp);
2547 /* put peer back at end of request queue, if discovery not already
2549 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2550 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2551 wake_up(&the_lnet.ln_dc_waitq);
2553 lnet_net_unlock(LNET_LOCK_EX);
2557 * Build a peer from incoming data.
2559 * The NIDs in the incoming data are supposed to be structured as follows:
2562 * - other NIDs in same net
2563 * - NIDs in second net
2564 * - NIDs in third net
2566 * This due to the way the list of NIDs in the data is created.
2568 * Note that this function will mark the peer uptodate unless an
2569 * ENOMEM is encontered. All other errors are due to a conflict
2570 * between the DLC configuration and what discovery sees. We treat DLC
2571 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2572 * peer from becoming stuck in discovery.
2574 static int lnet_peer_merge_data(struct lnet_peer *lp,
2575 struct lnet_ping_buffer *pbuf)
2577 struct lnet_peer_ni *lpni;
2578 lnet_nid_t *curnis = NULL;
2579 struct lnet_ni_status *addnis = NULL;
2580 lnet_nid_t *delnis = NULL;
2590 flags = LNET_PEER_DISCOVERED;
2591 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2592 flags |= LNET_PEER_MULTI_RAIL;
2595 * Cache the routing feature for the peer; whether it is enabled
2596 * for disabled as reported by the remote peer.
2598 spin_lock(&lp->lp_lock);
2599 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
2600 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
2602 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
2603 spin_unlock(&lp->lp_lock);
2605 nnis = max_t(int, lp->lp_nnis, pbuf->pb_info.pi_nnis);
2606 CFS_ALLOC_PTR_ARRAY(curnis, nnis);
2607 CFS_ALLOC_PTR_ARRAY(addnis, nnis);
2608 CFS_ALLOC_PTR_ARRAY(delnis, nnis);
2609 if (!curnis || !addnis || !delnis) {
2617 /* Construct the list of NIDs present in peer. */
2619 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2620 curnis[ncurnis++] = lpni->lpni_nid;
2623 * Check for NIDs in pbuf not present in curnis[].
2624 * The loop starts at 1 to skip the loopback NID.
2626 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2627 for (j = 0; j < ncurnis; j++)
2628 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2631 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
2634 * Check for NIDs in curnis[] not present in pbuf.
2635 * The nested loop starts at 1 to skip the loopback NID.
2637 * But never add the loopback NID to delnis[]: if it is
2638 * present in curnis[] then this peer is for this node.
2640 for (i = 0; i < ncurnis; i++) {
2641 if (LNET_NETTYP(LNET_NIDNET(curnis[i])) == LOLND)
2643 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
2644 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
2646 * update the information we cache for the
2647 * peer with the latest information we
2650 lpni = lnet_find_peer_ni_locked(curnis[i]);
2652 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
2653 lnet_peer_ni_decref_locked(lpni);
2658 if (j == pbuf->pb_info.pi_nnis)
2659 delnis[ndelnis++] = curnis[i];
2663 * If we get here and the discovery is disabled then we don't want
2664 * to add or delete any NIs. We just updated the ones we have some
2665 * information on, and call it a day
2668 if (lnet_is_discovery_disabled(lp))
2671 for (i = 0; i < naddnis; i++) {
2672 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
2674 CERROR("Error adding NID %s to peer %s: %d\n",
2675 libcfs_nid2str(addnis[i].ns_nid),
2676 libcfs_nid2str(lp->lp_primary_nid), rc);
2680 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
2682 lpni->lpni_ns_status = addnis[i].ns_status;
2683 lnet_peer_ni_decref_locked(lpni);
2687 for (i = 0; i < ndelnis; i++) {
2689 * for routers it's okay to delete the primary_nid because
2690 * the upper layers don't really rely on it. So if we're
2691 * being told that the router changed its primary_nid
2692 * then it's okay to delete it.
2694 if (lp->lp_rtr_refcount > 0)
2695 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
2696 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2698 CERROR("Error deleting NID %s from peer %s: %d\n",
2699 libcfs_nid2str(delnis[i]),
2700 libcfs_nid2str(lp->lp_primary_nid), rc);
2706 * Errors other than -ENOMEM are due to peers having been
2707 * configured with DLC. Ignore these because DLC overrides
2712 CFS_FREE_PTR_ARRAY(curnis, nnis);
2713 CFS_FREE_PTR_ARRAY(addnis, nnis);
2714 CFS_FREE_PTR_ARRAY(delnis, nnis);
2715 lnet_ping_buffer_decref(pbuf);
2716 CDEBUG(D_NET, "peer %s (%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
2719 spin_lock(&lp->lp_lock);
2720 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2721 lp->lp_state |= LNET_PEER_FORCE_PING;
2722 spin_unlock(&lp->lp_lock);
2728 * The data in pbuf says lp is its primary peer, but the data was
2729 * received by a different peer. Try to update lp with the data.
2732 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2734 struct lnet_handle_md mdh;
2736 /* Queue lp for discovery, and force it on the request queue. */
2737 lnet_net_lock(LNET_LOCK_EX);
2738 if (lnet_peer_queue_for_discovery(lp))
2739 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2740 lnet_net_unlock(LNET_LOCK_EX);
2742 LNetInvalidateMDHandle(&mdh);
2745 * Decide whether we can move the peer to the DATA_PRESENT state.
2747 * We replace stale data for a multi-rail peer, repair PING_FAILED
2748 * status, and preempt FORCE_PING.
2750 * If after that we have DATA_PRESENT, we merge it into this peer.
2752 spin_lock(&lp->lp_lock);
2753 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2754 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2755 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2756 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2757 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2758 lnet_ping_buffer_decref(pbuf);
2763 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2764 lnet_ping_buffer_decref(lp->lp_data);
2766 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2768 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2769 mdh = lp->lp_ping_mdh;
2770 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2771 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2772 lp->lp_ping_error = 0;
2774 if (lp->lp_state & LNET_PEER_FORCE_PING)
2775 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2776 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2777 spin_unlock(&lp->lp_lock);
2779 if (!LNetMDHandleIsInvalid(mdh))
2783 return lnet_peer_merge_data(lp, pbuf);
2785 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2789 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
2793 for (i = 0; i < pinfo->pi_nnis; i++) {
2794 if (pinfo->pi_ni[i].ns_nid == nid)
2802 * Update a peer using the data received.
2804 static int lnet_peer_data_present(struct lnet_peer *lp)
2805 __must_hold(&lp->lp_lock)
2807 struct lnet_ping_buffer *pbuf;
2808 struct lnet_peer_ni *lpni;
2809 lnet_nid_t nid = LNET_NID_ANY;
2815 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2816 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2817 spin_unlock(&lp->lp_lock);
2820 * Modifications of peer structures are done while holding the
2821 * ln_api_mutex. A global lock is required because we may be
2822 * modifying multiple peer structures, and a mutex greatly
2823 * simplifies memory management.
2825 * The actual changes to the data structures must also protect
2826 * against concurrent lookups, for which the lnet_net_lock in
2827 * LNET_LOCK_EX mode is used.
2829 mutex_lock(&the_lnet.ln_api_mutex);
2830 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2836 * If this peer is not on the peer list then it is being torn
2837 * down, and our reference count may be all that is keeping it
2838 * alive. Don't do any work on it.
2840 if (list_empty(&lp->lp_peer_list))
2843 flags = LNET_PEER_DISCOVERED;
2844 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2845 flags |= LNET_PEER_MULTI_RAIL;
2848 * Check whether the primary NID in the message matches the
2849 * primary NID of the peer. If it does, update the peer, if
2850 * it it does not, check whether there is already a peer with
2851 * that primary NID. If no such peer exists, try to update
2852 * the primary NID of the current peer (allowed if it was
2853 * created due to message traffic) and complete the update.
2854 * If the peer did exist, hand off the data to it.
2856 * The peer for the loopback interface is a special case: this
2857 * is the peer for the local node, and we want to set its
2858 * primary NID to the correct value here. Moreover, this peer
2859 * can show up with only the loopback NID in the ping buffer.
2861 if (pbuf->pb_info.pi_nnis <= 1)
2863 nid = pbuf->pb_info.pi_ni[1].ns_nid;
2864 if (LNET_NETTYP(LNET_NIDNET(lp->lp_primary_nid)) == LOLND) {
2865 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2867 rc = lnet_peer_merge_data(lp, pbuf);
2869 * if the primary nid of the peer is present in the ping info returned
2870 * from the peer, but it's not the local primary peer we have
2871 * cached and discovery is disabled, then we don't want to update
2872 * our local peer info, by adding or removing NIDs, we just want
2873 * to update the status of the nids that we currently have
2874 * recorded in that peer.
2876 } else if (lp->lp_primary_nid == nid ||
2877 (lnet_is_nid_in_ping_info(lp->lp_primary_nid, &pbuf->pb_info) &&
2878 lnet_is_discovery_disabled(lp))) {
2879 rc = lnet_peer_merge_data(lp, pbuf);
2881 lpni = lnet_find_peer_ni_locked(nid);
2883 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2885 CERROR("Primary NID error %s versus %s: %d\n",
2886 libcfs_nid2str(lp->lp_primary_nid),
2887 libcfs_nid2str(nid), rc);
2889 rc = lnet_peer_merge_data(lp, pbuf);
2892 struct lnet_peer *new_lp;
2893 new_lp = lpni->lpni_peer_net->lpn_peer;
2895 * if lp has discovery/MR enabled that means new_lp
2896 * should have discovery/MR enabled as well, since
2897 * it's the same peer, which we're about to merge
2899 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2900 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2901 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
2902 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
2904 rc = lnet_peer_set_primary_data(new_lp, pbuf);
2905 lnet_consolidate_routes_locked(lp, new_lp);
2906 lnet_peer_ni_decref_locked(lpni);
2910 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc,
2912 mutex_unlock(&the_lnet.ln_api_mutex);
2914 spin_lock(&lp->lp_lock);
2915 /* Tell discovery to re-check the peer immediately. */
2917 rc = LNET_REDISCOVER_PEER;
2922 * A ping failed. Clear the PING_FAILED state and set the
2923 * FORCE_PING state, to ensure a retry even if discovery is
2924 * disabled. This avoids being left with incorrect state.
2926 static int lnet_peer_ping_failed(struct lnet_peer *lp)
2927 __must_hold(&lp->lp_lock)
2929 struct lnet_handle_md mdh;
2932 mdh = lp->lp_ping_mdh;
2933 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2934 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2935 lp->lp_state |= LNET_PEER_FORCE_PING;
2936 rc = lp->lp_ping_error;
2937 lp->lp_ping_error = 0;
2938 spin_unlock(&lp->lp_lock);
2940 if (!LNetMDHandleIsInvalid(mdh))
2943 CDEBUG(D_NET, "peer %s:%d\n",
2944 libcfs_nid2str(lp->lp_primary_nid), rc);
2946 spin_lock(&lp->lp_lock);
2947 return rc ? rc : LNET_REDISCOVER_PEER;
2951 * Select NID to send a Ping or Push to.
2953 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
2955 struct lnet_peer_ni *lpni;
2957 /* Look for a direct-connected NID for this peer. */
2959 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2960 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
2965 return lpni->lpni_nid;
2967 /* Look for a routed-connected NID for this peer. */
2969 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2970 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
2975 return lpni->lpni_nid;
2977 return LNET_NID_ANY;
2980 /* Active side of ping. */
2981 static int lnet_peer_send_ping(struct lnet_peer *lp)
2982 __must_hold(&lp->lp_lock)
2989 lp->lp_state |= LNET_PEER_PING_SENT;
2990 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2991 spin_unlock(&lp->lp_lock);
2993 cpt = lnet_net_lock_current();
2994 /* Refcount for MD. */
2995 lnet_peer_addref_locked(lp);
2996 pnid = lnet_peer_select_nid(lp);
2997 lnet_net_unlock(cpt);
2999 nnis = max(lp->lp_data_nnis, LNET_INTERFACES_MIN);
3001 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
3002 the_lnet.ln_dc_eq, false);
3005 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3006 * refcount on the peer, otherwise LNetMDUnlink will be called
3007 * which will eventually do that.
3011 lnet_peer_decref_locked(lp);
3012 lnet_net_unlock(cpt);
3013 rc = -rc; /* change the rc to negative value */
3015 } else if (rc < 0) {
3019 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3021 spin_lock(&lp->lp_lock);
3025 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
3027 * The errors that get us here are considered hard errors and
3028 * cause Discovery to terminate. So we clear PING_SENT, but do
3029 * not set either PING_FAILED or FORCE_PING. In fact we need
3030 * to clear PING_FAILED, because the unlink event handler will
3031 * have set it if we called LNetMDUnlink() above.
3033 spin_lock(&lp->lp_lock);
3034 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3039 * This function exists because you cannot call LNetMDUnlink() from an
3042 static int lnet_peer_push_failed(struct lnet_peer *lp)
3043 __must_hold(&lp->lp_lock)
3045 struct lnet_handle_md mdh;
3048 mdh = lp->lp_push_mdh;
3049 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3050 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3051 rc = lp->lp_push_error;
3052 lp->lp_push_error = 0;
3053 spin_unlock(&lp->lp_lock);
3055 if (!LNetMDHandleIsInvalid(mdh))
3058 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3059 spin_lock(&lp->lp_lock);
3060 return rc ? rc : LNET_REDISCOVER_PEER;
3063 /* Active side of push. */
3064 static int lnet_peer_send_push(struct lnet_peer *lp)
3065 __must_hold(&lp->lp_lock)
3067 struct lnet_ping_buffer *pbuf;
3068 struct lnet_process_id id;
3073 /* Don't push to a non-multi-rail peer. */
3074 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3075 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3079 lp->lp_state |= LNET_PEER_PUSH_SENT;
3080 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3081 spin_unlock(&lp->lp_lock);
3083 cpt = lnet_net_lock_current();
3084 pbuf = the_lnet.ln_ping_target;
3085 lnet_ping_buffer_addref(pbuf);
3086 lnet_net_unlock(cpt);
3088 /* Push source MD */
3089 md.start = &pbuf->pb_info;
3090 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3091 md.threshold = 2; /* Put/Ack */
3094 md.eq_handle = the_lnet.ln_dc_eq;
3097 rc = LNetMDBind(md, LNET_UNLINK, &lp->lp_push_mdh);
3099 lnet_ping_buffer_decref(pbuf);
3100 CERROR("Can't bind push source MD: %d\n", rc);
3103 cpt = lnet_net_lock_current();
3104 /* Refcount for MD. */
3105 lnet_peer_addref_locked(lp);
3106 id.pid = LNET_PID_LUSTRE;
3107 id.nid = lnet_peer_select_nid(lp);
3108 lnet_net_unlock(cpt);
3110 if (id.nid == LNET_NID_ANY) {
3115 rc = LNetPut(LNET_NID_ANY, lp->lp_push_mdh,
3116 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3117 LNET_PROTO_PING_MATCHBITS, 0, 0);
3122 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3124 spin_lock(&lp->lp_lock);
3128 LNetMDUnlink(lp->lp_push_mdh);
3129 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3131 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
3133 * The errors that get us here are considered hard errors and
3134 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3135 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3136 * because the unlink event handler will have set it if we
3137 * called LNetMDUnlink() above.
3139 spin_lock(&lp->lp_lock);
3140 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3145 * An unrecoverable error was encountered during discovery.
3146 * Set error status in peer and abort discovery.
3148 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3150 CDEBUG(D_NET, "Discovery error %s: %d\n",
3151 libcfs_nid2str(lp->lp_primary_nid), error);
3153 spin_lock(&lp->lp_lock);
3154 lp->lp_dc_error = error;
3155 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3156 lp->lp_state |= LNET_PEER_REDISCOVER;
3157 spin_unlock(&lp->lp_lock);
3161 * Mark the peer as discovered.
3163 static int lnet_peer_discovered(struct lnet_peer *lp)
3164 __must_hold(&lp->lp_lock)
3166 lp->lp_state |= LNET_PEER_DISCOVERED;
3167 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3168 LNET_PEER_REDISCOVER);
3170 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3177 * Discovering this peer is taking too long. Cancel any Ping or Push
3178 * that discovery is waiting on by unlinking the relevant MDs. The
3179 * lnet_discovery_event_handler() will proceed from here and complete
3182 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
3184 struct lnet_handle_md ping_mdh;
3185 struct lnet_handle_md push_mdh;
3187 LNetInvalidateMDHandle(&ping_mdh);
3188 LNetInvalidateMDHandle(&push_mdh);
3190 spin_lock(&lp->lp_lock);
3191 if (lp->lp_state & LNET_PEER_PING_SENT) {
3192 ping_mdh = lp->lp_ping_mdh;
3193 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3195 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
3196 push_mdh = lp->lp_push_mdh;
3197 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3199 spin_unlock(&lp->lp_lock);
3201 if (!LNetMDHandleIsInvalid(ping_mdh))
3202 LNetMDUnlink(ping_mdh);
3203 if (!LNetMDHandleIsInvalid(push_mdh))
3204 LNetMDUnlink(push_mdh);
3208 * Wait for work to be queued or some other change that must be
3209 * attended to. Returns non-zero if the discovery thread should shut
3212 static int lnet_peer_discovery_wait_for_work(void)
3219 cpt = lnet_net_lock_current();
3221 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3222 TASK_INTERRUPTIBLE);
3223 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3225 if (lnet_push_target_resize_needed() ||
3226 the_lnet.ln_push_target->pb_needs_post)
3228 if (!list_empty(&the_lnet.ln_dc_request))
3230 if (!list_empty(&the_lnet.ln_msg_resend))
3232 lnet_net_unlock(cpt);
3235 * wakeup max every second to check if there are peers that
3236 * have been stuck on the working queue for greater than
3239 schedule_timeout(cfs_time_seconds(1));
3240 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3241 cpt = lnet_net_lock_current();
3243 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3245 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3248 lnet_net_unlock(cpt);
3250 CDEBUG(D_NET, "woken: %d\n", rc);
3256 * Messages that were pending on a destroyed peer will be put on a global
3257 * resend list. The message resend list will be checked by
3258 * the discovery thread when it wakes up, and will resend messages. These
3259 * messages can still be sendable in the case the lpni which was the initial
3260 * cause of the message re-queue was transfered to another peer.
3262 * It is possible that LNet could be shutdown while we're iterating
3263 * through the list. lnet_shudown_lndnets() will attempt to access the
3264 * resend list, but will have to wait until the spinlock is released, by
3265 * which time there shouldn't be any more messages on the resend list.
3266 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3267 * for the messages so they can be released. The other case is that
3268 * lnet_shudown_lndnets() can finalize all the messages before this
3269 * function can visit the resend list, in which case this function will be
3272 static void lnet_resend_msgs(void)
3274 struct lnet_msg *msg, *tmp;
3278 spin_lock(&the_lnet.ln_msg_resend_lock);
3279 list_splice(&the_lnet.ln_msg_resend, &resend);
3280 spin_unlock(&the_lnet.ln_msg_resend_lock);
3282 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3283 list_del_init(&msg->msg_list);
3284 rc = lnet_send(msg->msg_src_nid_param, msg,
3285 msg->msg_rtr_nid_param);
3287 CNETERR("Error sending %s to %s: %d\n",
3288 lnet_msgtyp2str(msg->msg_type),
3289 libcfs_id2str(msg->msg_target), rc);
3290 lnet_finalize(msg, rc);
3295 /* The discovery thread. */
3296 static int lnet_peer_discovery(void *arg)
3298 struct lnet_peer *lp;
3301 wait_for_completion(&the_lnet.ln_started);
3303 CDEBUG(D_NET, "started\n");
3306 if (lnet_peer_discovery_wait_for_work())
3309 if (lnet_push_target_resize_needed())
3310 lnet_push_target_resize();
3311 else if (the_lnet.ln_push_target->pb_needs_post)
3312 lnet_push_target_post(the_lnet.ln_push_target,
3313 &the_lnet.ln_push_target_md);
3317 lnet_net_lock(LNET_LOCK_EX);
3318 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING) {
3319 lnet_net_unlock(LNET_LOCK_EX);
3324 * Process all incoming discovery work requests. When
3325 * discovery must wait on a peer to change state, it
3326 * is added to the tail of the ln_dc_working queue. A
3327 * timestamp keeps track of when the peer was added,
3328 * so we can time out discovery requests that take too
3331 while (!list_empty(&the_lnet.ln_dc_request)) {
3332 lp = list_first_entry(&the_lnet.ln_dc_request,
3333 struct lnet_peer, lp_dc_list);
3334 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3336 * set the time the peer was put on the dc_working
3337 * queue. It shouldn't remain on the queue
3338 * forever, in case the GET message (for ping)
3339 * doesn't get a REPLY or the PUT message (for
3340 * push) doesn't get an ACK.
3342 lp->lp_last_queued = ktime_get_real_seconds();
3343 lnet_net_unlock(LNET_LOCK_EX);
3345 if (lnet_push_target_resize_needed())
3346 lnet_push_target_resize();
3347 else if (the_lnet.ln_push_target->pb_needs_post)
3348 lnet_push_target_post(the_lnet.ln_push_target,
3349 &the_lnet.ln_push_target_md);
3352 * Select an action depending on the state of
3353 * the peer and whether discovery is disabled.
3354 * The check whether discovery is disabled is
3355 * done after the code that handles processing
3356 * for arrived data, cleanup for failures, and
3357 * forcing a Ping or Push.
3359 spin_lock(&lp->lp_lock);
3360 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3361 libcfs_nid2str(lp->lp_primary_nid), lp,
3363 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3364 rc = lnet_peer_data_present(lp);
3365 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3366 rc = lnet_peer_ping_failed(lp);
3367 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3368 rc = lnet_peer_push_failed(lp);
3369 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3370 rc = lnet_peer_send_ping(lp);
3371 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3372 rc = lnet_peer_send_push(lp);
3373 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3374 rc = lnet_peer_send_ping(lp);
3375 else if (lnet_peer_needs_push(lp))
3376 rc = lnet_peer_send_push(lp);
3378 rc = lnet_peer_discovered(lp);
3379 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3380 libcfs_nid2str(lp->lp_primary_nid), lp,
3382 spin_unlock(&lp->lp_lock);
3384 lnet_net_lock(LNET_LOCK_EX);
3385 if (rc == LNET_REDISCOVER_PEER) {
3386 list_move(&lp->lp_dc_list,
3387 &the_lnet.ln_dc_request);
3389 lnet_peer_discovery_error(lp, rc);
3391 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3392 lnet_peer_discovery_complete(lp);
3393 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3396 if (lp->lp_state & LNET_PEER_MARK_DELETION) {
3397 struct list_head rlist;
3398 struct lnet_route *route, *tmp;
3399 int sensitivity = lp->lp_health_sensitivity;
3401 INIT_LIST_HEAD(&rlist);
3404 * remove the peer from the discovery work
3405 * queue if it's on there in preparation
3408 if (!list_empty(&lp->lp_dc_list))
3409 list_del(&lp->lp_dc_list);
3411 lnet_net_unlock(LNET_LOCK_EX);
3413 mutex_lock(&the_lnet.ln_api_mutex);
3415 lnet_net_lock(LNET_LOCK_EX);
3416 list_for_each_entry_safe(route, tmp,
3419 lnet_move_route(route, NULL, &rlist);
3420 lnet_net_unlock(LNET_LOCK_EX);
3422 /* delete the peer */
3425 list_for_each_entry_safe(route, tmp,
3427 /* re-add these routes */
3428 lnet_add_route(route->lr_net,
3433 LIBCFS_FREE(route, sizeof(*route));
3435 mutex_unlock(&the_lnet.ln_api_mutex);
3437 lnet_net_lock(LNET_LOCK_EX);
3441 lnet_net_unlock(LNET_LOCK_EX);
3444 CDEBUG(D_NET, "stopping\n");
3446 * Clean up before telling lnet_peer_discovery_stop() that
3447 * we're done. Use wake_up() below to somewhat reduce the
3448 * size of the thundering herd if there are multiple threads
3449 * waiting on discovery of a single peer.
3452 /* Queue cleanup 1: stop all pending pings and pushes. */
3453 lnet_net_lock(LNET_LOCK_EX);
3454 while (!list_empty(&the_lnet.ln_dc_working)) {
3455 lp = list_first_entry(&the_lnet.ln_dc_working,
3456 struct lnet_peer, lp_dc_list);
3457 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3458 lnet_net_unlock(LNET_LOCK_EX);
3459 lnet_peer_cancel_discovery(lp);
3460 lnet_net_lock(LNET_LOCK_EX);
3462 lnet_net_unlock(LNET_LOCK_EX);
3464 /* Queue cleanup 2: wait for the expired queue to clear. */
3465 while (!list_empty(&the_lnet.ln_dc_expired))
3466 schedule_timeout_uninterruptible(cfs_time_seconds(1));
3468 /* Queue cleanup 3: clear the request queue. */
3469 lnet_net_lock(LNET_LOCK_EX);
3470 while (!list_empty(&the_lnet.ln_dc_request)) {
3471 lp = list_first_entry(&the_lnet.ln_dc_request,
3472 struct lnet_peer, lp_dc_list);
3473 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3474 lnet_peer_discovery_complete(lp);
3476 lnet_net_unlock(LNET_LOCK_EX);
3478 LNetEQFree(the_lnet.ln_dc_eq);
3479 the_lnet.ln_dc_eq = NULL;
3481 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3482 wake_up(&the_lnet.ln_dc_waitq);
3484 CDEBUG(D_NET, "stopped\n");
3489 /* ln_api_mutex is held on entry. */
3490 int lnet_peer_discovery_start(void)
3492 struct task_struct *task;
3495 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3498 the_lnet.ln_dc_eq = LNetEQAlloc(lnet_discovery_event_handler);
3499 if (IS_ERR(the_lnet.ln_dc_eq)) {
3500 rc = PTR_ERR(the_lnet.ln_dc_eq);
3501 CERROR("Can't allocate discovery EQ: %d\n", rc);
3505 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3506 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3509 CERROR("Can't start peer discovery thread: %d\n", rc);
3511 LNetEQFree(the_lnet.ln_dc_eq);
3512 the_lnet.ln_dc_eq = NULL;
3514 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3517 CDEBUG(D_NET, "discovery start: %d\n", rc);
3522 /* ln_api_mutex is held on entry. */
3523 void lnet_peer_discovery_stop(void)
3525 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3528 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3529 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3531 /* In the LNetNIInit() path we may be stopping discovery before it
3532 * entered its work loop
3534 if (!completion_done(&the_lnet.ln_started))
3535 complete(&the_lnet.ln_started);
3537 wake_up(&the_lnet.ln_dc_waitq);
3539 wait_event(the_lnet.ln_dc_waitq,
3540 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3542 LASSERT(list_empty(&the_lnet.ln_dc_request));
3543 LASSERT(list_empty(&the_lnet.ln_dc_working));
3544 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3546 CDEBUG(D_NET, "discovery stopped\n");
3552 lnet_debug_peer(lnet_nid_t nid)
3554 char *aliveness = "NA";
3555 struct lnet_peer_ni *lp;
3558 cpt = lnet_cpt_of_nid(nid, NULL);
3561 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3563 lnet_net_unlock(cpt);
3564 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3568 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3569 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3571 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3572 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
3573 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3574 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3575 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3577 lnet_peer_ni_decref_locked(lp);
3579 lnet_net_unlock(cpt);
3582 /* Gathering information for userspace. */
3584 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3585 char aliveness[LNET_MAX_STR_LEN],
3586 __u32 *cpt_iter, __u32 *refcount,
3587 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3588 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3589 __u32 *peer_tx_qnob)
3591 struct lnet_peer_table *peer_table;
3592 struct lnet_peer_ni *lp;
3597 /* get the number of CPTs */
3598 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3600 /* if the cpt number to be examined is >= the number of cpts in
3601 * the system then indicate that there are no more cpts to examin
3603 if (*cpt_iter >= lncpt)
3606 /* get the current table */
3607 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3608 /* if the ptable is NULL then there are no more cpts to examine */
3609 if (peer_table == NULL)
3612 lnet_net_lock(*cpt_iter);
3614 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3615 struct list_head *peers = &peer_table->pt_hash[j];
3617 list_for_each_entry(lp, peers, lpni_hashlist) {
3618 if (peer_index-- > 0)
3621 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3622 if (lnet_isrouter(lp) ||
3623 lnet_peer_aliveness_enabled(lp))
3624 snprintf(aliveness, LNET_MAX_STR_LEN,
3625 lnet_is_peer_ni_alive(lp) ? "up" : "down");
3627 *nid = lp->lpni_nid;
3628 *refcount = atomic_read(&lp->lpni_refcount);
3629 *ni_peer_tx_credits =
3630 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3631 *peer_tx_credits = lp->lpni_txcredits;
3632 *peer_rtr_credits = lp->lpni_rtrcredits;
3633 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3634 *peer_tx_qnob = lp->lpni_txqnob;
3640 lnet_net_unlock(*cpt_iter);
3644 return found ? 0 : -ENOENT;
3647 /* ln_api_mutex is held, which keeps the peer list stable */
3648 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3650 struct lnet_ioctl_element_stats *lpni_stats;
3651 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3652 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3653 struct lnet_peer_ni_credit_info *lpni_info;
3654 struct lnet_peer_ni *lpni;
3655 struct lnet_peer *lp;
3660 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3667 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3668 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3669 size *= lp->lp_nnis;
3670 if (size > cfg->prcfg_size) {
3671 cfg->prcfg_size = size;
3676 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3677 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3678 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3679 cfg->prcfg_count = lp->lp_nnis;
3680 cfg->prcfg_size = size;
3681 cfg->prcfg_state = lp->lp_state;
3683 /* Allocate helper buffers. */
3685 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3688 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3691 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3692 if (!lpni_msg_stats)
3693 goto out_free_stats;
3694 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3696 goto out_free_msg_stats;
3701 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3702 nid = lpni->lpni_nid;
3703 if (copy_to_user(bulk, &nid, sizeof(nid)))
3704 goto out_free_hstats;
3705 bulk += sizeof(nid);
3707 memset(lpni_info, 0, sizeof(*lpni_info));
3708 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3709 if (lnet_isrouter(lpni) ||
3710 lnet_peer_aliveness_enabled(lpni))
3711 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3712 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
3714 lpni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
3715 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3716 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3717 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3718 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3719 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3720 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3721 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3722 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3723 goto out_free_hstats;
3724 bulk += sizeof(*lpni_info);
3726 memset(lpni_stats, 0, sizeof(*lpni_stats));
3727 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3728 LNET_STATS_TYPE_SEND);
3729 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3730 LNET_STATS_TYPE_RECV);
3731 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3732 LNET_STATS_TYPE_DROP);
3733 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3734 goto out_free_hstats;
3735 bulk += sizeof(*lpni_stats);
3736 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3737 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3738 goto out_free_hstats;
3739 bulk += sizeof(*lpni_msg_stats);
3740 lpni_hstats->hlpni_network_timeout =
3741 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3742 lpni_hstats->hlpni_remote_dropped =
3743 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3744 lpni_hstats->hlpni_remote_timeout =
3745 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3746 lpni_hstats->hlpni_remote_error =
3747 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3748 lpni_hstats->hlpni_health_value =
3749 atomic_read(&lpni->lpni_healthv);
3750 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3751 goto out_free_hstats;
3752 bulk += sizeof(*lpni_hstats);
3757 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3759 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3761 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3763 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
3765 lnet_peer_decref_locked(lp);
3771 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni)
3773 /* the mt could've shutdown and cleaned up the queues */
3774 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
3777 if (list_empty(&lpni->lpni_recovery) &&
3778 atomic_read(&lpni->lpni_healthv) < LNET_MAX_HEALTH_VALUE) {
3779 CDEBUG(D_NET, "lpni %s added to recovery queue. Health = %d\n",
3780 libcfs_nid2str(lpni->lpni_nid),
3781 atomic_read(&lpni->lpni_healthv));
3782 list_add_tail(&lpni->lpni_recovery, &the_lnet.ln_mt_peerNIRecovq);
3783 lnet_peer_ni_addref_locked(lpni);
3787 /* Call with the ln_api_mutex held */
3789 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3791 struct lnet_peer_table *ptable;
3792 struct lnet_peer *lp;
3793 struct lnet_peer_net *lpn;
3794 struct lnet_peer_ni *lpni;
3798 if (the_lnet.ln_state != LNET_STATE_RUNNING)
3802 lnet_net_lock(LNET_LOCK_EX);
3803 lpni = lnet_find_peer_ni_locked(nid);
3805 lnet_net_unlock(LNET_LOCK_EX);
3808 atomic_set(&lpni->lpni_healthv, value);
3809 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3810 lnet_peer_ni_decref_locked(lpni);
3811 lnet_net_unlock(LNET_LOCK_EX);
3815 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3818 * Walk all the peers and reset the healhv for each one to the
3821 lnet_net_lock(LNET_LOCK_EX);
3822 for (cpt = 0; cpt < lncpt; cpt++) {
3823 ptable = the_lnet.ln_peer_tables[cpt];
3824 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
3825 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
3826 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
3828 atomic_set(&lpni->lpni_healthv, value);
3829 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3834 lnet_net_unlock(LNET_LOCK_EX);