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/
34 #define DEBUG_SUBSYSTEM S_LNET
36 #include <linux/sched.h>
37 #ifdef HAVE_SCHED_HEADERS
38 #include <linux/sched/signal.h>
40 #include <linux/uaccess.h>
42 #include <lnet/udsp.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_NID_NET(&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(struct lnet_nid *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 INIT_LIST_HEAD(&lpni->lpni_rtr_pref_nids);
170 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
171 kref_init(&lpni->lpni_kref);
172 lpni->lpni_sel_priority = LNET_MAX_SELECTION_PRIORITY;
174 spin_lock_init(&lpni->lpni_lock);
176 if (lnet_peers_start_down())
177 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
179 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
180 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
181 lpni->lpni_nid = *nid;
182 lpni->lpni_cpt = cpt;
183 atomic_set(&lpni->lpni_healthv, LNET_MAX_HEALTH_VALUE);
185 net = lnet_get_net_locked(LNET_NID_NET(nid));
186 lpni->lpni_net = net;
188 lpni->lpni_txcredits = net->net_tunables.lct_peer_tx_credits;
189 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
190 lpni->lpni_rtrcredits = lnet_peer_buffer_credits(net);
191 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
194 * This peer_ni is not on a local network, so we
195 * cannot add the credits here. In case the net is
196 * added later, add the peer_ni to the remote peer ni
197 * list so it can be easily found and revisited.
199 /* FIXME: per-net implementation instead? */
200 lnet_peer_ni_addref_locked(lpni);
201 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
202 &the_lnet.ln_remote_peer_ni_list);
205 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nidstr(&lpni->lpni_nid));
210 static struct lnet_peer_net *
211 lnet_peer_net_alloc(__u32 net_id)
213 struct lnet_peer_net *lpn;
215 LIBCFS_CPT_ALLOC(lpn, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lpn));
219 INIT_LIST_HEAD(&lpn->lpn_peer_nets);
220 INIT_LIST_HEAD(&lpn->lpn_peer_nis);
221 lpn->lpn_net_id = net_id;
222 lpn->lpn_sel_priority = LNET_MAX_SELECTION_PRIORITY;
224 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
230 lnet_destroy_peer_net_locked(struct lnet_peer_net *lpn)
232 struct lnet_peer *lp;
234 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
236 LASSERT(atomic_read(&lpn->lpn_refcount) == 0);
237 LASSERT(list_empty(&lpn->lpn_peer_nis));
238 LASSERT(list_empty(&lpn->lpn_peer_nets));
240 lpn->lpn_peer = NULL;
241 LIBCFS_FREE(lpn, sizeof(*lpn));
243 lnet_peer_decref_locked(lp);
246 static struct lnet_peer *
247 lnet_peer_alloc(struct lnet_nid *nid)
249 struct lnet_peer *lp;
251 LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lp));
255 INIT_LIST_HEAD(&lp->lp_rtrq);
256 INIT_LIST_HEAD(&lp->lp_routes);
257 INIT_LIST_HEAD(&lp->lp_peer_list);
258 INIT_LIST_HEAD(&lp->lp_peer_nets);
259 INIT_LIST_HEAD(&lp->lp_dc_list);
260 INIT_LIST_HEAD(&lp->lp_dc_pendq);
261 INIT_LIST_HEAD(&lp->lp_rtr_list);
262 init_waitqueue_head(&lp->lp_dc_waitq);
263 spin_lock_init(&lp->lp_lock);
264 lp->lp_primary_nid = *nid;
265 lp->lp_disc_src_nid = LNET_ANY_NID;
266 lp->lp_disc_dst_nid = LNET_ANY_NID;
267 if (lnet_peers_start_down())
268 lp->lp_alive = false;
273 * all peers created on a router should have health on
274 * if it's not already on.
276 if (the_lnet.ln_routing && !lnet_health_sensitivity)
277 lp->lp_health_sensitivity = 1;
280 * Turn off discovery for loopback peer. If you're creating a peer
281 * for the loopback interface then that was initiated when we
282 * attempted to send a message over the loopback. There is no need
283 * to ever use a different interface when sending messages to
287 lp->lp_state = LNET_PEER_NO_DISCOVERY;
288 lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
290 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nidstr(&lp->lp_primary_nid));
296 lnet_destroy_peer_locked(struct lnet_peer *lp)
298 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nidstr(&lp->lp_primary_nid));
300 LASSERT(atomic_read(&lp->lp_refcount) == 0);
301 LASSERT(lp->lp_rtr_refcount == 0);
302 LASSERT(list_empty(&lp->lp_peer_nets));
303 LASSERT(list_empty(&lp->lp_peer_list));
304 LASSERT(list_empty(&lp->lp_dc_list));
307 lnet_ping_buffer_decref(lp->lp_data);
310 * if there are messages still on the pending queue, then make
311 * sure to queue them on the ln_msg_resend list so they can be
312 * resent at a later point if the discovery thread is still
314 * If the discovery thread has stopped, then the wakeup will be a
315 * no-op, and it is expected the lnet_shutdown_lndnets() will
316 * eventually be called, which will traverse this list and
317 * finalize the messages on the list.
318 * We can not resend them now because we're holding the cpt lock.
319 * Releasing the lock can cause an inconsistent state
321 spin_lock(&the_lnet.ln_msg_resend_lock);
322 spin_lock(&lp->lp_lock);
323 list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
324 spin_unlock(&lp->lp_lock);
325 spin_unlock(&the_lnet.ln_msg_resend_lock);
326 wake_up(&the_lnet.ln_dc_waitq);
328 LIBCFS_FREE(lp, sizeof(*lp));
332 * Detach a peer_ni from its peer_net. If this was the last peer_ni on
333 * that peer_net, detach the peer_net from the peer.
335 * Call with lnet_net_lock/EX held
338 lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
340 struct lnet_peer_table *ptable;
341 struct lnet_peer_net *lpn;
342 struct lnet_peer *lp;
345 * Belts and suspenders: gracefully handle teardown of a
346 * partially connected peer_ni.
348 lpn = lpni->lpni_peer_net;
350 list_del_init(&lpni->lpni_peer_nis);
352 * If there are no lpni's left, we detach lpn from
353 * lp_peer_nets, so it cannot be found anymore.
355 if (list_empty(&lpn->lpn_peer_nis))
356 list_del_init(&lpn->lpn_peer_nets);
358 /* Update peer NID count. */
363 * If there are no more peer nets, make the peer unfindable
364 * via the peer_tables.
366 * Otherwise, if the peer is DISCOVERED, tell discovery to
367 * take another look at it. This is a no-op if discovery for
368 * this peer did the detaching.
370 if (list_empty(&lp->lp_peer_nets)) {
371 list_del_init(&lp->lp_peer_list);
372 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
374 } else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
375 /* Discovery isn't running, nothing to do here. */
376 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
377 lnet_peer_queue_for_discovery(lp);
378 wake_up(&the_lnet.ln_dc_waitq);
380 CDEBUG(D_NET, "peer %s NID %s\n",
381 libcfs_nidstr(&lp->lp_primary_nid),
382 libcfs_nidstr(&lpni->lpni_nid));
385 /* called with lnet_net_lock LNET_LOCK_EX held */
387 lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni, bool force)
389 struct lnet_peer_table *ptable = NULL;
391 /* don't remove a peer_ni if it's also a gateway */
392 if (lnet_isrouter(lpni) && !force) {
393 CERROR("Peer NI %s is a gateway. Can not delete it\n",
394 libcfs_nidstr(&lpni->lpni_nid));
398 lnet_peer_remove_from_remote_list(lpni);
400 /* remove peer ni from the hash list. */
401 list_del_init(&lpni->lpni_hashlist);
404 * indicate the peer is being deleted so the monitor thread can
405 * remove it from the recovery queue.
407 spin_lock(&lpni->lpni_lock);
408 lpni->lpni_state |= LNET_PEER_NI_DELETING;
409 spin_unlock(&lpni->lpni_lock);
411 /* decrement the ref count on the peer table */
412 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
415 * The peer_ni can no longer be found with a lookup. But there
416 * can be current users, so keep track of it on the zombie
417 * list until the reference count has gone to zero.
419 * The last reference may be lost in a place where the
420 * lnet_net_lock locks only a single cpt, and that cpt may not
421 * be lpni->lpni_cpt. So the zombie list of lnet_peer_table
424 spin_lock(&ptable->pt_zombie_lock);
425 list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
426 ptable->pt_zombies++;
427 spin_unlock(&ptable->pt_zombie_lock);
429 /* no need to keep this peer_ni on the hierarchy anymore */
430 lnet_peer_detach_peer_ni_locked(lpni);
432 /* remove hashlist reference on peer_ni */
433 lnet_peer_ni_decref_locked(lpni);
438 void lnet_peer_uninit(void)
440 struct lnet_peer_ni *lpni, *tmp;
442 lnet_net_lock(LNET_LOCK_EX);
444 /* remove all peer_nis from the remote peer and the hash list */
445 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
446 lpni_on_remote_peer_ni_list)
447 lnet_peer_ni_del_locked(lpni, false);
449 lnet_peer_tables_destroy();
451 lnet_net_unlock(LNET_LOCK_EX);
455 lnet_peer_del_locked(struct lnet_peer *peer)
457 struct lnet_peer_ni *lpni = NULL, *lpni2;
460 CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&peer->lp_primary_nid));
462 spin_lock(&peer->lp_lock);
463 peer->lp_state |= LNET_PEER_MARK_DELETED;
464 spin_unlock(&peer->lp_lock);
466 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
467 while (lpni != NULL) {
468 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
469 rc = lnet_peer_ni_del_locked(lpni, false);
479 * Discovering this peer is taking too long. Cancel any Ping or Push
480 * that discovery is waiting on by unlinking the relevant MDs. The
481 * lnet_discovery_event_handler() will proceed from here and complete
484 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
486 struct lnet_handle_md ping_mdh;
487 struct lnet_handle_md push_mdh;
489 LNetInvalidateMDHandle(&ping_mdh);
490 LNetInvalidateMDHandle(&push_mdh);
492 spin_lock(&lp->lp_lock);
493 if (lp->lp_state & LNET_PEER_PING_SENT) {
494 ping_mdh = lp->lp_ping_mdh;
495 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
497 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
498 push_mdh = lp->lp_push_mdh;
499 LNetInvalidateMDHandle(&lp->lp_push_mdh);
501 spin_unlock(&lp->lp_lock);
503 if (!LNetMDHandleIsInvalid(ping_mdh))
504 LNetMDUnlink(ping_mdh);
505 if (!LNetMDHandleIsInvalid(push_mdh))
506 LNetMDUnlink(push_mdh);
510 lnet_peer_del(struct lnet_peer *peer)
512 lnet_peer_cancel_discovery(peer);
513 lnet_net_lock(LNET_LOCK_EX);
514 lnet_peer_del_locked(peer);
515 lnet_net_unlock(LNET_LOCK_EX);
521 * Delete a NID from a peer. Call with ln_api_mutex held.
524 * -EPERM: Non-DLC deletion from DLC-configured peer.
525 * -ENOENT: No lnet_peer_ni corresponding to the nid.
526 * -ECHILD: The lnet_peer_ni isn't connected to the peer.
527 * -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
530 lnet_peer_del_nid(struct lnet_peer *lp, lnet_nid_t nid4, unsigned int flags)
532 struct lnet_peer_ni *lpni;
533 struct lnet_nid primary_nid = lp->lp_primary_nid;
536 bool force = (flags & LNET_PEER_RTR_NI_FORCE_DEL) ? true : false;
538 lnet_nid4_to_nid(nid4, &nid);
539 if (!(flags & LNET_PEER_CONFIGURED)) {
540 if (lp->lp_state & LNET_PEER_CONFIGURED) {
546 /* If we're asked to lock down the primary NID we shouldn't be
549 if (lp->lp_state & LNET_PEER_LOCK_PRIMARY &&
550 nid_same(&primary_nid, &nid)) {
555 lpni = lnet_peer_ni_find_locked(&nid);
560 lnet_peer_ni_decref_locked(lpni);
561 if (lp != lpni->lpni_peer_net->lpn_peer) {
567 * This function only allows deletion of the primary NID if it
570 if (nid_same(&nid, &lp->lp_primary_nid) && lp->lp_nnis != 1 && !force) {
575 lnet_net_lock(LNET_LOCK_EX);
577 if (nid_same(&nid, &lp->lp_primary_nid) && lp->lp_nnis != 1 && force) {
578 struct lnet_peer_ni *lpni2;
579 /* assign the next peer_ni to be the primary */
580 lpni2 = lnet_get_next_peer_ni_locked(lp, NULL, lpni);
582 lp->lp_primary_nid = lpni2->lpni_nid;
584 rc = lnet_peer_ni_del_locked(lpni, force);
586 lnet_net_unlock(LNET_LOCK_EX);
589 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
590 libcfs_nidstr(&primary_nid), libcfs_nidstr(&nid),
597 lnet_peer_table_cleanup_locked(struct lnet_net *net,
598 struct lnet_peer_table *ptable)
601 struct lnet_peer_ni *next;
602 struct lnet_peer_ni *lpni;
603 struct lnet_peer *peer;
605 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
606 list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
608 if (net != NULL && net != lpni->lpni_net)
611 peer = lpni->lpni_peer_net->lpn_peer;
612 if (!nid_same(&peer->lp_primary_nid,
614 lnet_peer_ni_del_locked(lpni, false);
618 * Removing the primary NID implies removing
619 * the entire peer. Advance next beyond any
620 * peer_ni that belongs to the same peer.
622 list_for_each_entry_from(next, &ptable->pt_hash[i],
624 if (next->lpni_peer_net->lpn_peer != peer)
627 lnet_peer_del_locked(peer);
633 lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
635 wait_var_event_warning(&ptable->pt_zombies,
636 ptable->pt_zombies == 0,
637 "Waiting for %d zombies on peer table\n",
642 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
643 struct lnet_peer_table *ptable)
645 struct lnet_peer_ni *lp;
646 struct lnet_peer_ni *tmp;
650 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
651 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
653 if (net != lp->lpni_net)
656 if (!lnet_isrouter(lp))
659 /* FIXME handle large-addr nid */
660 gw_nid = lnet_nid_to_nid4(
661 &lp->lpni_peer_net->lpn_peer->lp_primary_nid);
663 lnet_net_unlock(LNET_LOCK_EX);
664 lnet_del_route(LNET_NET_ANY, gw_nid);
665 lnet_net_lock(LNET_LOCK_EX);
671 lnet_peer_tables_cleanup(struct lnet_net *net)
674 struct lnet_peer_table *ptable;
676 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
677 /* If just deleting the peers for a NI, get rid of any routes these
678 * peers are gateways for. */
679 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
680 lnet_net_lock(LNET_LOCK_EX);
681 lnet_peer_table_del_rtrs_locked(net, ptable);
682 lnet_net_unlock(LNET_LOCK_EX);
685 /* Start the cleanup process */
686 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
687 lnet_net_lock(LNET_LOCK_EX);
688 lnet_peer_table_cleanup_locked(net, ptable);
689 lnet_net_unlock(LNET_LOCK_EX);
692 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
693 lnet_peer_ni_finalize_wait(ptable);
696 static struct lnet_peer_ni *
697 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, struct lnet_nid *nid)
699 struct list_head *peers;
700 struct lnet_peer_ni *lp;
702 if (the_lnet.ln_state != LNET_STATE_RUNNING)
705 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
706 list_for_each_entry(lp, peers, lpni_hashlist) {
707 if (nid_same(&lp->lpni_nid, nid)) {
708 lnet_peer_ni_addref_locked(lp);
716 struct lnet_peer_ni *
717 lnet_find_peer_ni_locked(lnet_nid_t nid4)
719 struct lnet_peer_ni *lpni;
720 struct lnet_peer_table *ptable;
724 lnet_nid4_to_nid(nid4, &nid);
726 cpt = lnet_nid_cpt_hash(&nid, LNET_CPT_NUMBER);
728 ptable = the_lnet.ln_peer_tables[cpt];
729 lpni = lnet_get_peer_ni_locked(ptable, &nid);
734 struct lnet_peer_ni *
735 lnet_peer_ni_find_locked(struct lnet_nid *nid)
737 struct lnet_peer_ni *lpni;
738 struct lnet_peer_table *ptable;
741 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
743 ptable = the_lnet.ln_peer_tables[cpt];
744 lpni = lnet_get_peer_ni_locked(ptable, nid);
749 struct lnet_peer_ni *
750 lnet_peer_get_ni_locked(struct lnet_peer *lp, lnet_nid_t nid)
752 struct lnet_peer_net *lpn;
753 struct lnet_peer_ni *lpni;
755 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
759 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
760 if (lnet_nid_to_nid4(&lpni->lpni_nid) == nid)
767 struct lnet_peer_ni *
768 lnet_peer_ni_get_locked(struct lnet_peer *lp, struct lnet_nid *nid)
770 struct lnet_peer_net *lpn;
771 struct lnet_peer_ni *lpni;
773 lpn = lnet_peer_get_net_locked(lp, LNET_NID_NET(nid));
777 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
778 if (nid_same(&lpni->lpni_nid, nid))
786 lnet_find_peer(lnet_nid_t nid)
788 struct lnet_peer_ni *lpni;
789 struct lnet_peer *lp = NULL;
792 cpt = lnet_net_lock_current();
793 lpni = lnet_find_peer_ni_locked(nid);
795 lp = lpni->lpni_peer_net->lpn_peer;
796 lnet_peer_addref_locked(lp);
797 lnet_peer_ni_decref_locked(lpni);
799 lnet_net_unlock(cpt);
804 struct lnet_peer_net *
805 lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
807 struct lnet_peer_net *net;
810 /* no net id provided return the first net */
811 net = list_first_entry_or_null(&lp->lp_peer_nets,
812 struct lnet_peer_net,
818 /* find the net after the one provided */
819 list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
820 if (net->lpn_net_id == prev_lpn_id) {
822 * if we reached the end of the list loop to the
825 if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
826 return list_first_entry_or_null(&lp->lp_peer_nets,
827 struct lnet_peer_net,
830 return list_next_entry(net, lpn_peer_nets);
837 struct lnet_peer_ni *
838 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
839 struct lnet_peer_net *peer_net,
840 struct lnet_peer_ni *prev)
842 struct lnet_peer_ni *lpni;
843 struct lnet_peer_net *net = peer_net;
847 if (list_empty(&peer->lp_peer_nets))
850 net = list_entry(peer->lp_peer_nets.next,
851 struct lnet_peer_net,
854 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
860 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
862 * if you reached the end of the peer ni list and the peer
863 * net is specified then there are no more peer nis in that
870 * we reached the end of this net ni list. move to the
873 if (prev->lpni_peer_net->lpn_peer_nets.next ==
875 /* no more nets and no more NIs. */
878 /* get the next net */
879 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
880 struct lnet_peer_net,
882 /* get the ni on it */
883 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
889 /* there are more nis left */
890 lpni = list_entry(prev->lpni_peer_nis.next,
891 struct lnet_peer_ni, lpni_peer_nis);
896 /* Call with the ln_api_mutex held */
897 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
899 struct lnet_process_id id;
900 struct lnet_peer_table *ptable;
901 struct lnet_peer *lp;
910 if (the_lnet.ln_state != LNET_STATE_RUNNING)
913 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
916 * Count the number of peers, and return E2BIG if the buffer
917 * is too small. We'll also return the desired size.
920 for (cpt = 0; cpt < lncpt; cpt++) {
921 ptable = the_lnet.ln_peer_tables[cpt];
922 count += ptable->pt_peers;
924 size = count * sizeof(*ids);
929 * Walk the peer lists and copy out the primary nids.
930 * This is safe because the peer lists are only modified
931 * while the ln_api_mutex is held. So we don't need to
932 * hold the lnet_net_lock as well, and can therefore
933 * directly call copy_to_user().
936 memset(&id, 0, sizeof(id));
937 id.pid = LNET_PID_LUSTRE;
939 for (cpt = 0; cpt < lncpt; cpt++) {
940 ptable = the_lnet.ln_peer_tables[cpt];
941 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
942 if (!nid_is_nid4(&lp->lp_primary_nid))
946 id.nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
947 if (copy_to_user(&ids[i], &id, sizeof(id)))
960 * Start pushes to peers that need to be updated for a configuration
961 * change on this node.
964 lnet_push_update_to_peers(int force)
966 struct lnet_peer_table *ptable;
967 struct lnet_peer *lp;
971 lnet_net_lock(LNET_LOCK_EX);
972 if (lnet_peer_discovery_disabled)
974 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
975 for (cpt = 0; cpt < lncpt; cpt++) {
976 ptable = the_lnet.ln_peer_tables[cpt];
977 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
979 spin_lock(&lp->lp_lock);
980 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
981 lp->lp_state |= LNET_PEER_FORCE_PUSH;
982 spin_unlock(&lp->lp_lock);
984 if (lnet_peer_needs_push(lp))
985 lnet_peer_queue_for_discovery(lp);
988 lnet_net_unlock(LNET_LOCK_EX);
989 wake_up(&the_lnet.ln_dc_waitq);
992 /* find the NID in the preferred gateways for the remote peer
994 * false: list is not empty and NID is not preferred
995 * false: list is empty
996 * true: nid is found in the list
999 lnet_peer_is_pref_rtr_locked(struct lnet_peer_ni *lpni,
1002 struct lnet_nid_list *ne;
1004 CDEBUG(D_NET, "%s: rtr pref emtpy: %d\n",
1005 libcfs_nidstr(&lpni->lpni_nid),
1006 list_empty(&lpni->lpni_rtr_pref_nids));
1008 if (list_empty(&lpni->lpni_rtr_pref_nids))
1011 /* iterate through all the preferred NIDs and see if any of them
1012 * matches the provided gw_nid
1014 list_for_each_entry(ne, &lpni->lpni_rtr_pref_nids, nl_list) {
1015 CDEBUG(D_NET, "Comparing pref %s with gw %s\n",
1016 libcfs_nid2str(ne->nl_nid),
1017 libcfs_nid2str(gw_nid));
1018 if (ne->nl_nid == gw_nid)
1026 lnet_peer_clr_pref_rtrs(struct lnet_peer_ni *lpni)
1028 struct list_head zombies;
1029 struct lnet_nid_list *ne;
1030 struct lnet_nid_list *tmp;
1031 int cpt = lpni->lpni_cpt;
1033 INIT_LIST_HEAD(&zombies);
1036 list_splice_init(&lpni->lpni_rtr_pref_nids, &zombies);
1037 lnet_net_unlock(cpt);
1039 list_for_each_entry_safe(ne, tmp, &zombies, nl_list) {
1040 list_del(&ne->nl_list);
1041 LIBCFS_FREE(ne, sizeof(*ne));
1046 lnet_peer_add_pref_rtr(struct lnet_peer_ni *lpni,
1049 int cpt = lpni->lpni_cpt;
1050 struct lnet_nid_list *ne = NULL;
1052 /* This function is called with api_mutex held. When the api_mutex
1053 * is held the list can not be modified, as it is only modified as
1054 * a result of applying a UDSP and that happens under api_mutex
1057 __must_hold(&the_lnet.ln_api_mutex);
1059 list_for_each_entry(ne, &lpni->lpni_rtr_pref_nids, nl_list) {
1060 if (ne->nl_nid == gw_nid)
1064 LIBCFS_CPT_ALLOC(ne, lnet_cpt_table(), cpt, sizeof(*ne));
1068 ne->nl_nid = gw_nid;
1070 /* Lock the cpt to protect against addition and checks in the
1071 * selection algorithm
1074 list_add(&ne->nl_list, &lpni->lpni_rtr_pref_nids);
1075 lnet_net_unlock(cpt);
1081 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
1082 * this is a preferred point-to-point path. Call with lnet_net_lock in
1086 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1088 struct lnet_nid_list *ne;
1090 if (lpni->lpni_pref_nnids == 0)
1092 if (lpni->lpni_pref_nnids == 1)
1093 return lpni->lpni_pref.nid == nid;
1094 list_for_each_entry(ne, &lpni->lpni_pref.nids, nl_list) {
1095 if (ne->nl_nid == nid)
1102 * Set a single ni as preferred, provided no preferred ni is already
1103 * defined. Only to be used for non-multi-rail peer_ni.
1106 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1110 spin_lock(&lpni->lpni_lock);
1111 if (nid == LNET_NID_ANY) {
1113 } else if (lpni->lpni_pref_nnids > 0) {
1115 } else if (lpni->lpni_pref_nnids == 0) {
1116 lpni->lpni_pref.nid = nid;
1117 lpni->lpni_pref_nnids = 1;
1118 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
1120 spin_unlock(&lpni->lpni_lock);
1122 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1123 libcfs_nidstr(&lpni->lpni_nid), libcfs_nid2str(nid), rc);
1128 * Clear the preferred NID from a non-multi-rail peer_ni, provided
1129 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
1132 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
1136 spin_lock(&lpni->lpni_lock);
1137 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
1138 lpni->lpni_pref_nnids = 0;
1139 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1140 } else if (lpni->lpni_pref_nnids == 0) {
1145 spin_unlock(&lpni->lpni_lock);
1147 CDEBUG(D_NET, "peer %s: %d\n",
1148 libcfs_nidstr(&lpni->lpni_nid), rc);
1153 lnet_peer_ni_set_selection_priority(struct lnet_peer_ni *lpni, __u32 priority)
1155 lpni->lpni_sel_priority = priority;
1159 * Clear the preferred NIDs from a non-multi-rail peer.
1162 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
1164 struct lnet_peer_ni *lpni = NULL;
1166 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
1167 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
1171 lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1173 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1174 struct lnet_nid_list *ne1 = NULL;
1175 struct lnet_nid_list *ne2 = NULL;
1176 lnet_nid_t tmp_nid = LNET_NID_ANY;
1179 if (nid == LNET_NID_ANY) {
1184 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
1189 /* A non-MR node may have only one preferred NI per peer_ni */
1190 if (lpni->lpni_pref_nnids > 0 &&
1191 !(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1196 /* add the new preferred nid to the list of preferred nids */
1197 if (lpni->lpni_pref_nnids != 0) {
1198 size_t alloc_size = sizeof(*ne1);
1200 if (lpni->lpni_pref_nnids == 1) {
1201 tmp_nid = lpni->lpni_pref.nid;
1202 INIT_LIST_HEAD(&lpni->lpni_pref.nids);
1205 list_for_each_entry(ne1, &lpni->lpni_pref.nids, nl_list) {
1206 if (ne1->nl_nid == nid) {
1212 LIBCFS_CPT_ALLOC(ne1, lnet_cpt_table(), lpni->lpni_cpt,
1219 /* move the originally stored nid to the list */
1220 if (lpni->lpni_pref_nnids == 1) {
1221 LIBCFS_CPT_ALLOC(ne2, lnet_cpt_table(),
1222 lpni->lpni_cpt, alloc_size);
1227 INIT_LIST_HEAD(&ne2->nl_list);
1228 ne2->nl_nid = tmp_nid;
1233 lnet_net_lock(LNET_LOCK_EX);
1234 spin_lock(&lpni->lpni_lock);
1235 if (lpni->lpni_pref_nnids == 0) {
1236 lpni->lpni_pref.nid = nid;
1239 list_add_tail(&ne2->nl_list, &lpni->lpni_pref.nids);
1240 list_add_tail(&ne1->nl_list, &lpni->lpni_pref.nids);
1242 lpni->lpni_pref_nnids++;
1243 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1244 spin_unlock(&lpni->lpni_lock);
1245 lnet_net_unlock(LNET_LOCK_EX);
1248 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
1249 spin_lock(&lpni->lpni_lock);
1250 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1251 spin_unlock(&lpni->lpni_lock);
1253 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1254 libcfs_nidstr(&lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1259 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1261 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1262 struct lnet_nid_list *ne = NULL;
1265 if (lpni->lpni_pref_nnids == 0) {
1270 if (lpni->lpni_pref_nnids == 1) {
1271 if (lpni->lpni_pref.nid != nid) {
1276 list_for_each_entry(ne, &lpni->lpni_pref.nids, nl_list) {
1277 if (ne->nl_nid == nid)
1278 goto remove_nid_entry;
1286 lnet_net_lock(LNET_LOCK_EX);
1287 spin_lock(&lpni->lpni_lock);
1288 if (lpni->lpni_pref_nnids == 1)
1289 lpni->lpni_pref.nid = LNET_NID_ANY;
1291 list_del_init(&ne->nl_list);
1292 if (lpni->lpni_pref_nnids == 2) {
1293 struct lnet_nid_list *ne, *tmp;
1295 list_for_each_entry_safe(ne, tmp,
1296 &lpni->lpni_pref.nids,
1298 lpni->lpni_pref.nid = ne->nl_nid;
1299 list_del_init(&ne->nl_list);
1300 LIBCFS_FREE(ne, sizeof(*ne));
1304 lpni->lpni_pref_nnids--;
1305 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1306 spin_unlock(&lpni->lpni_lock);
1307 lnet_net_unlock(LNET_LOCK_EX);
1310 LIBCFS_FREE(ne, sizeof(*ne));
1312 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1313 libcfs_nidstr(&lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1318 lnet_peer_clr_pref_nids(struct lnet_peer_ni *lpni)
1320 struct list_head zombies;
1321 struct lnet_nid_list *ne;
1322 struct lnet_nid_list *tmp;
1324 INIT_LIST_HEAD(&zombies);
1326 lnet_net_lock(LNET_LOCK_EX);
1327 if (lpni->lpni_pref_nnids == 1)
1328 lpni->lpni_pref.nid = LNET_NID_ANY;
1329 else if (lpni->lpni_pref_nnids > 1)
1330 list_splice_init(&lpni->lpni_pref.nids, &zombies);
1331 lpni->lpni_pref_nnids = 0;
1332 lnet_net_unlock(LNET_LOCK_EX);
1334 list_for_each_entry_safe(ne, tmp, &zombies, nl_list) {
1335 list_del_init(&ne->nl_list);
1336 LIBCFS_FREE(ne, sizeof(*ne));
1341 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1343 /* FIXME handle large-addr nid */
1344 struct lnet_peer_ni *lpni;
1345 lnet_nid_t primary_nid = nid;
1347 lpni = lnet_find_peer_ni_locked(nid);
1349 primary_nid = lnet_nid_to_nid4(
1350 &lpni->lpni_peer_net->lpn_peer->lp_primary_nid);
1351 lnet_peer_ni_decref_locked(lpni);
1358 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1359 __must_hold(&lp->lp_lock)
1361 if (lnet_peer_discovery_disabled)
1364 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1365 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1376 lnet_is_discovery_disabled(struct lnet_peer *lp)
1380 spin_lock(&lp->lp_lock);
1381 rc = lnet_is_discovery_disabled_locked(lp);
1382 spin_unlock(&lp->lp_lock);
1388 LNetAddPeer(lnet_nid_t *nids, __u32 num_nids)
1390 lnet_nid_t pnid = 0;
1394 if (!nids || num_nids < 1)
1397 rc = LNetNIInit(LNET_PID_ANY);
1401 mutex_lock(&the_lnet.ln_api_mutex);
1403 mr = lnet_peer_discovery_disabled == 0;
1406 for (i = 0; i < num_nids; i++) {
1407 if (nids[i] == LNET_NID_LO_0)
1412 rc = lnet_add_peer_ni(pnid, LNET_NID_ANY, mr, true);
1413 } else if (lnet_peer_discovery_disabled) {
1414 rc = lnet_add_peer_ni(nids[i], LNET_NID_ANY, mr, true);
1416 rc = lnet_add_peer_ni(pnid, nids[i], mr, true);
1419 if (rc && rc != -EEXIST)
1424 mutex_unlock(&the_lnet.ln_api_mutex);
1428 return rc == -EEXIST ? 0 : rc;
1430 EXPORT_SYMBOL(LNetAddPeer);
1432 /* FIXME support large-addr nid */
1434 LNetPrimaryNID(lnet_nid_t nid)
1436 struct lnet_peer *lp;
1437 struct lnet_peer_ni *lpni;
1438 lnet_nid_t primary_nid = nid;
1442 if (nid == LNET_NID_LO_0)
1443 return LNET_NID_LO_0;
1445 cpt = lnet_net_lock_current();
1446 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1451 lp = lpni->lpni_peer_net->lpn_peer;
1453 /* If discovery is disabled locally then we needn't bother running
1454 * discovery here because discovery will not modify whatever
1455 * primary NID is currently set for this peer. If the specified peer is
1456 * down then this discovery can introduce long delays into the mount
1457 * process, so skip it if it isn't necessary.
1459 if (!lnet_peer_discovery_disabled && !lnet_peer_is_uptodate(lp)) {
1460 spin_lock(&lp->lp_lock);
1461 /* force a full discovery cycle */
1462 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH |
1463 LNET_PEER_LOCK_PRIMARY;
1464 spin_unlock(&lp->lp_lock);
1466 /* start discovery in the background. Messages to that
1467 * peer will not go through until the discovery is
1470 rc = lnet_discover_peer_locked(lpni, cpt, false);
1473 /* The lpni (or lp) for this NID may have changed and our ref is
1474 * the only thing keeping the old one around. Release the ref
1475 * and lookup the lpni again
1477 lnet_peer_ni_decref_locked(lpni);
1478 lpni = lnet_find_peer_ni_locked(nid);
1483 lp = lpni->lpni_peer_net->lpn_peer;
1485 primary_nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
1487 lnet_peer_ni_decref_locked(lpni);
1489 lnet_net_unlock(cpt);
1491 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1492 libcfs_nid2str(primary_nid), rc);
1495 EXPORT_SYMBOL(LNetPrimaryNID);
1497 struct lnet_peer_net *
1498 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1500 struct lnet_peer_net *peer_net;
1501 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1502 if (peer_net->lpn_net_id == net_id)
1509 * Attach a peer_ni to a peer_net and peer. This function assumes
1510 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1511 * may be attached to a different peer, in which case it will be
1512 * properly detached first. The whole operation is done atomically.
1514 * This function consumes the reference on lpni and Always returns 0.
1515 * This is the last function called from functions that do return an
1516 * int, so returning 0 here allows the compiler to do a tail call.
1519 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1520 struct lnet_peer_net *lpn,
1521 struct lnet_peer_ni *lpni,
1524 struct lnet_peer_table *ptable;
1525 bool new_lpn = false;
1528 /* Install the new peer_ni */
1529 lnet_net_lock(LNET_LOCK_EX);
1530 /* Add peer_ni to global peer table hash, if necessary. */
1531 if (list_empty(&lpni->lpni_hashlist)) {
1532 int hash = lnet_nid2peerhash(&lpni->lpni_nid);
1534 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1535 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1536 ptable->pt_version++;
1537 lnet_peer_ni_addref_locked(lpni);
1540 /* Detach the peer_ni from an existing peer, if necessary. */
1541 if (lpni->lpni_peer_net) {
1542 LASSERT(lpni->lpni_peer_net != lpn);
1543 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1544 lnet_peer_detach_peer_ni_locked(lpni);
1545 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1546 lpni->lpni_peer_net = NULL;
1549 /* Add peer_ni to peer_net */
1550 lpni->lpni_peer_net = lpn;
1551 if (nid_same(&lp->lp_primary_nid, &lpni->lpni_nid))
1552 list_add(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1554 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1555 lnet_update_peer_net_healthv(lpni);
1556 lnet_peer_net_addref_locked(lpn);
1558 /* Add peer_net to peer */
1559 if (!lpn->lpn_peer) {
1562 if (nid_same(&lp->lp_primary_nid, &lpni->lpni_nid))
1563 list_add(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1565 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1566 lnet_peer_addref_locked(lp);
1569 /* Add peer to global peer list, if necessary */
1570 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1571 if (list_empty(&lp->lp_peer_list)) {
1572 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1577 /* Update peer state */
1578 spin_lock(&lp->lp_lock);
1579 if (flags & LNET_PEER_CONFIGURED) {
1580 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1581 lp->lp_state |= LNET_PEER_CONFIGURED;
1583 if (flags & LNET_PEER_MULTI_RAIL) {
1584 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1585 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1586 lnet_peer_clr_non_mr_pref_nids(lp);
1589 if (flags & LNET_PEER_LOCK_PRIMARY)
1590 lp->lp_state |= LNET_PEER_LOCK_PRIMARY;
1591 spin_unlock(&lp->lp_lock);
1597 rc = lnet_udsp_apply_policies_on_lpn(lpn);
1599 CERROR("Failed to apply UDSPs on lpn %s\n",
1600 libcfs_net2str(lpn->lpn_net_id));
1602 rc = lnet_udsp_apply_policies_on_lpni(lpni);
1604 CERROR("Failed to apply UDSPs on lpni %s\n",
1605 libcfs_nidstr(&lpni->lpni_nid));
1607 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1608 libcfs_nidstr(&lp->lp_primary_nid),
1609 libcfs_nidstr(&lpni->lpni_nid), flags);
1610 lnet_peer_ni_decref_locked(lpni);
1611 lnet_net_unlock(LNET_LOCK_EX);
1617 * Create a new peer, with nid as its primary nid.
1619 * Call with the lnet_api_mutex held.
1622 lnet_peer_add(lnet_nid_t nid4, unsigned int flags)
1624 struct lnet_nid nid;
1625 struct lnet_peer *lp;
1626 struct lnet_peer_net *lpn;
1627 struct lnet_peer_ni *lpni;
1630 LASSERT(nid4 != LNET_NID_ANY);
1633 * No need for the lnet_net_lock here, because the
1634 * lnet_api_mutex is held.
1636 lpni = lnet_find_peer_ni_locked(nid4);
1638 /* A peer with this NID already exists. */
1639 lp = lpni->lpni_peer_net->lpn_peer;
1640 lnet_peer_ni_decref_locked(lpni);
1642 * This is an error if the peer was configured and the
1643 * primary NID differs or an attempt is made to change
1644 * the Multi-Rail flag. Otherwise the assumption is
1645 * that an existing peer is being modified.
1647 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1648 if (lnet_nid_to_nid4(&lp->lp_primary_nid) != nid4)
1650 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1653 } else if (!(flags & LNET_PEER_CONFIGURED)) {
1654 if (lnet_nid_to_nid4(&lp->lp_primary_nid) == nid4) {
1659 /* Delete and recreate as a configured peer. */
1663 /* Create peer, peer_net, and peer_ni. */
1665 lnet_nid4_to_nid(nid4, &nid);
1666 lp = lnet_peer_alloc(&nid);
1669 lpn = lnet_peer_net_alloc(LNET_NID_NET(&nid));
1672 lpni = lnet_peer_ni_alloc(&nid);
1676 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1679 LIBCFS_FREE(lpn, sizeof(*lpn));
1681 LIBCFS_FREE(lp, sizeof(*lp));
1683 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1684 libcfs_nid2str(nid4), flags, rc);
1689 * Add a NID to a peer. Call with ln_api_mutex held.
1692 * -EPERM: Non-DLC addition to a DLC-configured peer.
1693 * -EEXIST: The NID was configured by DLC for a different peer.
1694 * -ENOMEM: Out of memory.
1695 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1696 * non-multi-rail peer.
1699 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid4, unsigned int flags)
1701 struct lnet_peer_net *lpn;
1702 struct lnet_peer_ni *lpni;
1703 struct lnet_nid nid;
1707 LASSERT(nid4 != LNET_NID_ANY);
1709 lnet_nid4_to_nid(nid4, &nid);
1711 /* A configured peer can only be updated through configuration. */
1712 if (!(flags & LNET_PEER_CONFIGURED)) {
1713 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1720 * The MULTI_RAIL flag can be set but not cleared, because
1721 * that would leave the peer struct in an invalid state.
1723 if (flags & LNET_PEER_MULTI_RAIL) {
1724 spin_lock(&lp->lp_lock);
1725 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1726 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1727 lnet_peer_clr_non_mr_pref_nids(lp);
1729 spin_unlock(&lp->lp_lock);
1730 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1735 lpni = lnet_find_peer_ni_locked(nid4);
1738 * A peer_ni already exists. This is only a problem if
1739 * it is not connected to this peer and was configured
1742 if (lpni->lpni_peer_net->lpn_peer == lp)
1744 if (lnet_peer_ni_is_configured(lpni)) {
1748 /* If this is the primary NID, destroy the peer. */
1749 if (lnet_peer_ni_is_primary(lpni)) {
1750 struct lnet_peer *lp2 =
1751 lpni->lpni_peer_net->lpn_peer;
1752 int rtr_refcount = lp2->lp_rtr_refcount;
1754 /* If the new peer that this NID belongs to is
1755 * a primary NID for another peer which we're
1756 * suppose to preserve the Primary for then we
1757 * don't want to mess with it. But the
1758 * configuration is wrong at this point, so we
1759 * should flag both of these peers as in a bad
1762 if (lp2->lp_state & LNET_PEER_LOCK_PRIMARY) {
1763 spin_lock(&lp->lp_lock);
1764 lp->lp_state |= LNET_PEER_BAD_CONFIG;
1765 spin_unlock(&lp->lp_lock);
1766 spin_lock(&lp2->lp_lock);
1767 lp2->lp_state |= LNET_PEER_BAD_CONFIG;
1768 spin_unlock(&lp2->lp_lock);
1772 * if we're trying to delete a router it means
1773 * we're moving this peer NI to a new peer so must
1774 * transfer router properties to the new peer
1776 if (rtr_refcount > 0) {
1777 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1778 lnet_rtr_transfer_to_peer(lp2, lp);
1781 lnet_peer_ni_decref_locked(lpni);
1782 lpni = lnet_peer_ni_alloc(&nid);
1789 lpni = lnet_peer_ni_alloc(&nid);
1797 * Get the peer_net. Check that we're not adding a second
1798 * peer_ni on a peer_net of a non-multi-rail peer.
1800 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid4));
1802 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid4));
1807 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1812 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1815 lnet_peer_ni_decref_locked(lpni);
1817 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1818 libcfs_nidstr(&lp->lp_primary_nid), libcfs_nid2str(nid4),
1824 * Update the primary NID of a peer, if possible.
1826 * Call with the lnet_api_mutex held.
1829 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid,
1832 struct lnet_nid old = lp->lp_primary_nid;
1835 if (lnet_nid_to_nid4(&lp->lp_primary_nid) == nid)
1838 if (!(lp->lp_state & LNET_PEER_LOCK_PRIMARY))
1839 lnet_nid4_to_nid(nid, &lp->lp_primary_nid);
1841 rc = lnet_peer_add_nid(lp, nid, flags);
1843 lp->lp_primary_nid = old;
1847 /* if this is a configured peer or the primary for that peer has
1848 * been locked, then we don't want to flag this scenario as
1851 if (lp->lp_state & LNET_PEER_CONFIGURED ||
1852 lp->lp_state & LNET_PEER_LOCK_PRIMARY)
1855 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1856 libcfs_nidstr(&old), libcfs_nid2str(nid), rc);
1862 * lpni creation initiated due to traffic either sending or receiving.
1865 lnet_peer_ni_traffic_add(struct lnet_nid *nid, lnet_nid_t pref)
1867 struct lnet_peer *lp;
1868 struct lnet_peer_net *lpn;
1869 struct lnet_peer_ni *lpni;
1873 if (LNET_NID_IS_ANY(nid)) {
1878 /* lnet_net_lock is not needed here because ln_api_lock is held */
1879 lpni = lnet_peer_ni_find_locked(nid);
1882 * We must have raced with another thread. Since we
1883 * know next to nothing about a peer_ni created by
1884 * traffic, we just assume everything is ok and
1887 lnet_peer_ni_decref_locked(lpni);
1891 /* Create peer, peer_net, and peer_ni. */
1893 lp = lnet_peer_alloc(nid);
1896 lpn = lnet_peer_net_alloc(LNET_NID_NET(nid));
1899 lpni = lnet_peer_ni_alloc(nid);
1902 if (pref != LNET_NID_ANY)
1903 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1905 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1908 LIBCFS_FREE(lpn, sizeof(*lpn));
1910 LIBCFS_FREE(lp, sizeof(*lp));
1912 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nidstr(nid), rc);
1917 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1919 * This API handles the following combinations:
1920 * Create a peer with its primary NI if only the prim_nid is provided
1921 * Add a NID to a peer identified by the prim_nid. The peer identified
1922 * by the prim_nid must already exist.
1923 * The peer being created may be non-MR.
1925 * The caller must hold ln_api_mutex. This prevents the peer from
1926 * being created/modified/deleted by a different thread.
1929 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr, bool temp)
1931 struct lnet_peer *lp = NULL;
1932 struct lnet_peer_ni *lpni;
1933 unsigned int flags = 0;
1935 /* The prim_nid must always be specified */
1936 if (prim_nid == LNET_NID_ANY)
1940 flags = LNET_PEER_CONFIGURED;
1943 flags |= LNET_PEER_MULTI_RAIL;
1946 * If nid isn't specified, we must create a new peer with
1947 * prim_nid as its primary nid.
1949 if (nid == LNET_NID_ANY)
1950 return lnet_peer_add(prim_nid, flags);
1952 /* Look up the prim_nid, which must exist. */
1953 lpni = lnet_find_peer_ni_locked(prim_nid);
1956 lnet_peer_ni_decref_locked(lpni);
1957 lp = lpni->lpni_peer_net->lpn_peer;
1959 /* Peer must have been configured. */
1960 if (!temp && !(lp->lp_state & LNET_PEER_CONFIGURED)) {
1961 CDEBUG(D_NET, "peer %s was not configured\n",
1962 libcfs_nid2str(prim_nid));
1966 /* Primary NID must match */
1967 if (lnet_nid_to_nid4(&lp->lp_primary_nid) != prim_nid) {
1968 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1969 libcfs_nid2str(prim_nid),
1970 libcfs_nidstr(&lp->lp_primary_nid));
1974 /* Multi-Rail flag must match. */
1975 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1976 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1977 libcfs_nid2str(prim_nid));
1981 return lnet_peer_add_nid(lp, nid, flags);
1985 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1987 * This API handles the following combinations:
1988 * Delete a NI from a peer if both prim_nid and nid are provided.
1989 * Delete a peer if only prim_nid is provided.
1990 * Delete a peer if its primary nid is provided.
1992 * The caller must hold ln_api_mutex. This prevents the peer from
1993 * being modified/deleted by a different thread.
1996 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1998 struct lnet_peer *lp;
1999 struct lnet_peer_ni *lpni;
2002 if (prim_nid == LNET_NID_ANY)
2005 lpni = lnet_find_peer_ni_locked(prim_nid);
2008 lnet_peer_ni_decref_locked(lpni);
2009 lp = lpni->lpni_peer_net->lpn_peer;
2011 if (prim_nid != lnet_nid_to_nid4(&lp->lp_primary_nid)) {
2012 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
2013 libcfs_nid2str(prim_nid),
2014 libcfs_nidstr(&lp->lp_primary_nid));
2018 lnet_net_lock(LNET_LOCK_EX);
2019 if (lp->lp_rtr_refcount > 0) {
2020 lnet_net_unlock(LNET_LOCK_EX);
2021 CERROR("%s is a router. Can not be deleted\n",
2022 libcfs_nid2str(prim_nid));
2025 lnet_net_unlock(LNET_LOCK_EX);
2027 if (nid == LNET_NID_ANY || nid == lnet_nid_to_nid4(&lp->lp_primary_nid))
2028 return lnet_peer_del(lp);
2030 flags = LNET_PEER_CONFIGURED;
2031 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
2032 flags |= LNET_PEER_MULTI_RAIL;
2034 return lnet_peer_del_nid(lp, nid, flags);
2038 lnet_destroy_peer_ni_locked(struct kref *ref)
2040 struct lnet_peer_ni *lpni = container_of(ref, struct lnet_peer_ni,
2042 struct lnet_peer_table *ptable;
2043 struct lnet_peer_net *lpn;
2045 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nidstr(&lpni->lpni_nid));
2047 LASSERT(kref_read(&lpni->lpni_kref) == 0);
2048 LASSERT(list_empty(&lpni->lpni_txq));
2049 LASSERT(lpni->lpni_txqnob == 0);
2050 LASSERT(list_empty(&lpni->lpni_peer_nis));
2051 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
2053 lpn = lpni->lpni_peer_net;
2054 lpni->lpni_peer_net = NULL;
2055 lpni->lpni_net = NULL;
2057 if (!list_empty(&lpni->lpni_hashlist)) {
2058 /* remove the peer ni from the zombie list */
2059 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
2060 spin_lock(&ptable->pt_zombie_lock);
2061 list_del_init(&lpni->lpni_hashlist);
2062 ptable->pt_zombies--;
2063 spin_unlock(&ptable->pt_zombie_lock);
2066 if (lpni->lpni_pref_nnids > 1) {
2067 struct lnet_nid_list *ne, *tmp;
2069 list_for_each_entry_safe(ne, tmp, &lpni->lpni_pref.nids,
2071 list_del_init(&ne->nl_list);
2072 LIBCFS_FREE(ne, sizeof(*ne));
2075 LIBCFS_FREE(lpni, sizeof(*lpni));
2078 lnet_peer_net_decref_locked(lpn);
2081 struct lnet_peer_ni *
2082 lnet_nid2peerni_ex(struct lnet_nid *nid, int cpt)
2084 struct lnet_peer_ni *lpni = NULL;
2087 if (the_lnet.ln_state != LNET_STATE_RUNNING)
2088 return ERR_PTR(-ESHUTDOWN);
2091 * find if a peer_ni already exists.
2092 * If so then just return that.
2094 lpni = lnet_peer_ni_find_locked(nid);
2098 lnet_net_unlock(cpt);
2100 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
2103 goto out_net_relock;
2106 lpni = lnet_peer_ni_find_locked(nid);
2116 * Get a peer_ni for the given nid, create it if necessary. Takes a
2117 * hold on the peer_ni.
2119 struct lnet_peer_ni *
2120 lnet_nid2peerni_locked(lnet_nid_t nid4, lnet_nid_t pref, int cpt)
2122 struct lnet_peer_ni *lpni = NULL;
2123 struct lnet_nid nid;
2126 if (the_lnet.ln_state != LNET_STATE_RUNNING)
2127 return ERR_PTR(-ESHUTDOWN);
2129 lnet_nid4_to_nid(nid4, &nid);
2131 * find if a peer_ni already exists.
2132 * If so then just return that.
2134 lpni = lnet_find_peer_ni_locked(nid4);
2140 * use the lnet_api_mutex to serialize the creation of the peer_ni
2141 * and the creation/deletion of the local ni/net. When a local ni is
2142 * created, if there exists a set of peer_nis on that network,
2143 * they need to be traversed and updated. When a local NI is
2144 * deleted, which could result in a network being deleted, then
2145 * all peer nis on that network need to be removed as well.
2147 * Creation through traffic should also be serialized with
2148 * creation through DLC.
2150 lnet_net_unlock(cpt);
2151 mutex_lock(&the_lnet.ln_api_mutex);
2153 * Shutdown is only set under the ln_api_lock, so a single
2154 * check here is sufficent.
2156 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2157 lpni = ERR_PTR(-ESHUTDOWN);
2158 goto out_mutex_unlock;
2161 rc = lnet_peer_ni_traffic_add(&nid, pref);
2164 goto out_mutex_unlock;
2167 lpni = lnet_find_peer_ni_locked(nid4);
2171 mutex_unlock(&the_lnet.ln_api_mutex);
2174 /* Lock has been dropped, check again for shutdown. */
2175 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2177 lnet_peer_ni_decref_locked(lpni);
2178 lpni = ERR_PTR(-ESHUTDOWN);
2185 lnet_peer_gw_discovery(struct lnet_peer *lp)
2189 spin_lock(&lp->lp_lock);
2190 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
2192 spin_unlock(&lp->lp_lock);
2198 lnet_peer_is_uptodate(struct lnet_peer *lp)
2202 spin_lock(&lp->lp_lock);
2203 rc = lnet_peer_is_uptodate_locked(lp);
2204 spin_unlock(&lp->lp_lock);
2209 * Is a peer uptodate from the point of view of discovery?
2211 * If it is currently being processed, obviously not.
2212 * A forced Ping or Push is also handled by the discovery thread.
2214 * Otherwise look at whether the peer needs rediscovering.
2217 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
2218 __must_hold(&lp->lp_lock)
2222 if (lp->lp_state & (LNET_PEER_DISCOVERING |
2223 LNET_PEER_FORCE_PING |
2224 LNET_PEER_FORCE_PUSH)) {
2226 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
2228 } else if (lnet_peer_needs_push(lp)) {
2230 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
2231 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
2242 /* Add the message to the peer's lp_dc_pendq and queue the peer for discovery */
2244 lnet_peer_queue_message(struct lnet_peer *lp, struct lnet_msg *msg)
2246 /* The discovery thread holds net_lock/EX and lp_lock when it splices
2247 * the lp_dc_pendq onto a local list for resending. Thus, we do the same
2248 * when adding to the list and queuing the peer to ensure that we do not
2249 * strand any messages on the lp_dc_pendq. This scheme ensures the
2250 * message will be resent even if the peer is already being discovered.
2251 * Therefore we needn't check the return value of
2252 * lnet_peer_queue_for_discovery(lp).
2254 lnet_net_lock(LNET_LOCK_EX);
2255 spin_lock(&lp->lp_lock);
2256 list_add_tail(&msg->msg_list, &lp->lp_dc_pendq);
2257 spin_unlock(&lp->lp_lock);
2258 lnet_peer_queue_for_discovery(lp);
2259 lnet_net_unlock(LNET_LOCK_EX);
2263 * Queue a peer for the attention of the discovery thread. Call with
2264 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
2265 * -EALREADY if the peer was already queued.
2267 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
2271 spin_lock(&lp->lp_lock);
2272 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2273 lp->lp_state |= LNET_PEER_DISCOVERING;
2274 spin_unlock(&lp->lp_lock);
2275 if (list_empty(&lp->lp_dc_list)) {
2276 lnet_peer_addref_locked(lp);
2277 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2278 wake_up(&the_lnet.ln_dc_waitq);
2284 CDEBUG(D_NET, "Queue peer %s: %d\n",
2285 libcfs_nidstr(&lp->lp_primary_nid), rc);
2291 * Discovery of a peer is complete. Wake all waiters on the peer.
2292 * Call with lnet_net_lock/EX held.
2294 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
2296 struct lnet_msg *msg, *tmp;
2298 LIST_HEAD(pending_msgs);
2300 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
2301 libcfs_nidstr(&lp->lp_primary_nid));
2303 list_del_init(&lp->lp_dc_list);
2304 spin_lock(&lp->lp_lock);
2305 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
2306 spin_unlock(&lp->lp_lock);
2307 wake_up(&lp->lp_dc_waitq);
2309 if (lp->lp_rtr_refcount > 0)
2310 lnet_router_discovery_complete(lp);
2312 lnet_net_unlock(LNET_LOCK_EX);
2314 /* iterate through all pending messages and send them again */
2315 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
2316 list_del_init(&msg->msg_list);
2317 if (lp->lp_dc_error) {
2318 lnet_finalize(msg, lp->lp_dc_error);
2322 CDEBUG(D_NET, "sending pending message %s to target %s\n",
2323 lnet_msgtyp2str(msg->msg_type),
2324 libcfs_id2str(msg->msg_target));
2325 rc = lnet_send(msg->msg_src_nid_param, msg,
2326 msg->msg_rtr_nid_param);
2328 CNETERR("Error sending %s to %s: %d\n",
2329 lnet_msgtyp2str(msg->msg_type),
2330 libcfs_id2str(msg->msg_target), rc);
2331 lnet_finalize(msg, rc);
2334 lnet_net_lock(LNET_LOCK_EX);
2335 lnet_peer_decref_locked(lp);
2339 * Handle inbound push.
2340 * Like any event handler, called with lnet_res_lock/CPT held.
2342 void lnet_peer_push_event(struct lnet_event *ev)
2344 struct lnet_ping_buffer *pbuf;
2345 struct lnet_peer *lp;
2347 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start + ev->offset);
2349 /* lnet_find_peer() adds a refcount */
2350 lp = lnet_find_peer(ev->source.nid);
2352 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
2353 libcfs_nid2str(ev->initiator.nid),
2354 libcfs_nid2str(ev->source.nid));
2355 pbuf->pb_needs_post = true;
2359 /* Ensure peer state remains consistent while we modify it. */
2360 spin_lock(&lp->lp_lock);
2363 * If some kind of error happened the contents of the message
2364 * cannot be used. Clear the NIDS_UPTODATE and set the
2365 * FORCE_PING flag to trigger a ping.
2368 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2369 lp->lp_state |= LNET_PEER_FORCE_PING;
2370 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
2372 libcfs_nidstr(&lp->lp_primary_nid),
2373 libcfs_nid2str(ev->source.nid));
2378 * A push with invalid or corrupted info. Clear the UPTODATE
2379 * flag to trigger a ping.
2381 if (lnet_ping_info_validate(&pbuf->pb_info)) {
2382 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2383 lp->lp_state |= LNET_PEER_FORCE_PING;
2384 CDEBUG(D_NET, "Corrupted Push from %s\n",
2385 libcfs_nidstr(&lp->lp_primary_nid));
2390 * Make sure we'll allocate the correct size ping buffer when
2393 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2394 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2397 * A non-Multi-Rail peer is not supposed to be capable of
2400 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2401 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2402 libcfs_nidstr(&lp->lp_primary_nid));
2407 * The peer may have discovery disabled at its end. Set
2408 * NO_DISCOVERY as appropriate.
2410 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2411 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2412 libcfs_nidstr(&lp->lp_primary_nid));
2414 * Mark the peer for deletion if we already know about it
2415 * and it's going from discovery set to no discovery set
2417 if (!(lp->lp_state & (LNET_PEER_NO_DISCOVERY |
2418 LNET_PEER_DISCOVERING)) &&
2419 lp->lp_state & LNET_PEER_DISCOVERED) {
2420 CDEBUG(D_NET, "Marking %s:0x%x for deletion\n",
2421 libcfs_nidstr(&lp->lp_primary_nid),
2423 lp->lp_state |= LNET_PEER_MARK_DELETION;
2425 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2426 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2427 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2428 libcfs_nidstr(&lp->lp_primary_nid));
2429 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2433 * Update the MULTI_RAIL flag based on the push. If the peer
2434 * was configured with DLC then the setting should match what
2436 * NB: We verified above that the MR feature bit is set in pi_features
2438 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2439 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2440 libcfs_nidstr(&lp->lp_primary_nid), lp);
2441 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2442 CWARN("Push says %s is Multi-Rail, DLC says not\n",
2443 libcfs_nidstr(&lp->lp_primary_nid));
2444 } else if (lnet_peer_discovery_disabled) {
2445 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled locally\n",
2446 libcfs_nidstr(&lp->lp_primary_nid), lp);
2447 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2448 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled remotely\n",
2449 libcfs_nidstr(&lp->lp_primary_nid), lp);
2451 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2452 libcfs_nidstr(&lp->lp_primary_nid), lp);
2453 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2454 lnet_peer_clr_non_mr_pref_nids(lp);
2458 * Check for truncation of the Put message. Clear the
2459 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2460 * and tell discovery to allocate a bigger buffer.
2462 if (ev->mlength < ev->rlength) {
2463 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2464 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2465 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2466 lp->lp_state |= LNET_PEER_FORCE_PING;
2467 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2468 libcfs_nidstr(&lp->lp_primary_nid),
2469 pbuf->pb_info.pi_nnis);
2473 /* always assume new data */
2474 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2475 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2478 * If there is data present that hasn't been processed yet,
2479 * we'll replace it if the Put contained newer data and it
2480 * fits. We're racing with a Ping or earlier Push in this
2483 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2484 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2485 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2486 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2487 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2488 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2489 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2490 libcfs_nidstr(&lp->lp_primary_nid),
2491 LNET_PING_BUFFER_SEQNO(pbuf),
2492 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2498 * Allocate a buffer to copy the data. On a failure we drop
2499 * the Push and set FORCE_PING to force the discovery
2500 * thread to fix the problem by pinging the peer.
2502 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2504 lp->lp_state |= LNET_PEER_FORCE_PING;
2505 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2506 libcfs_nidstr(&lp->lp_primary_nid),
2507 LNET_PING_BUFFER_SEQNO(pbuf));
2512 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2513 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2514 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2515 CDEBUG(D_NET, "Received Push %s %u\n",
2516 libcfs_nidstr(&lp->lp_primary_nid),
2517 LNET_PING_BUFFER_SEQNO(pbuf));
2520 /* We've processed this buffer. It can be reposted */
2521 pbuf->pb_needs_post = true;
2524 * Queue the peer for discovery if not done, force it on the request
2525 * queue and wake the discovery thread if the peer was already queued,
2526 * because its status changed.
2528 spin_unlock(&lp->lp_lock);
2529 lnet_net_lock(LNET_LOCK_EX);
2530 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2531 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2532 wake_up(&the_lnet.ln_dc_waitq);
2534 /* Drop refcount from lookup */
2535 lnet_peer_decref_locked(lp);
2536 lnet_net_unlock(LNET_LOCK_EX);
2540 * Clear the discovery error state, unless we're already discovering
2541 * this peer, in which case the error is current.
2543 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2545 spin_lock(&lp->lp_lock);
2546 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2547 lp->lp_dc_error = 0;
2548 spin_unlock(&lp->lp_lock);
2552 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2553 * dropped/retaken within this function. An lnet_peer_ni is passed in
2554 * because discovery could tear down an lnet_peer.
2557 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2560 struct lnet_peer *lp;
2565 lnet_net_unlock(cpt);
2566 lnet_net_lock(LNET_LOCK_EX);
2567 lp = lpni->lpni_peer_net->lpn_peer;
2568 lnet_peer_clear_discovery_error(lp);
2571 * We're willing to be interrupted. The lpni can become a
2572 * zombie if we race with DLC, so we must check for that.
2575 /* Keep lp alive when the lnet_net_lock is unlocked */
2576 lnet_peer_addref_locked(lp);
2577 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2578 if (signal_pending(current))
2580 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2583 * Don't repeat discovery if discovery is disabled. This is
2584 * done to ensure we can use discovery as a standard ping as
2585 * well for backwards compatibility with routers which do not
2586 * have discovery or have discovery disabled
2588 if (lnet_is_discovery_disabled(lp) && count > 0)
2590 if (lp->lp_dc_error)
2592 if (lnet_peer_is_uptodate(lp))
2594 lnet_peer_queue_for_discovery(lp);
2596 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2599 * If caller requested a non-blocking operation then
2600 * return immediately. Once discovery is complete any
2601 * pending messages that were stopped due to discovery
2602 * will be transmitted.
2607 lnet_net_unlock(LNET_LOCK_EX);
2609 finish_wait(&lp->lp_dc_waitq, &wait);
2610 lnet_net_lock(LNET_LOCK_EX);
2611 lnet_peer_decref_locked(lp);
2612 /* Peer may have changed */
2613 lp = lpni->lpni_peer_net->lpn_peer;
2615 finish_wait(&lp->lp_dc_waitq, &wait);
2617 lnet_net_unlock(LNET_LOCK_EX);
2619 lnet_peer_decref_locked(lp);
2621 * The peer may have changed, so re-check and rediscover if that turns
2622 * out to have been the case. The reference count on lp ensured that
2623 * even if it was unlinked from lpni the memory could not be recycled.
2624 * Thus the check below is sufficient to determine whether the peer
2625 * changed. If the peer changed, then lp must not be dereferenced.
2627 if (lp != lpni->lpni_peer_net->lpn_peer)
2630 if (signal_pending(current))
2632 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2634 else if (lp->lp_dc_error)
2635 rc = lp->lp_dc_error;
2637 CDEBUG(D_NET, "non-blocking discovery\n");
2638 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2641 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2642 (lp ? libcfs_nidstr(&lp->lp_primary_nid) : "(none)"),
2643 libcfs_nidstr(&lpni->lpni_nid), rc,
2644 (!block) ? "pending discovery" : "discovery complete");
2649 /* Handle an incoming ack for a push. */
2651 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2653 struct lnet_ping_buffer *pbuf;
2655 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2656 spin_lock(&lp->lp_lock);
2657 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2658 lp->lp_push_error = ev->status;
2660 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2662 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2663 spin_unlock(&lp->lp_lock);
2665 CDEBUG(D_NET, "peer %s ev->status %d\n",
2666 libcfs_nidstr(&lp->lp_primary_nid), ev->status);
2669 /* Handle a Reply message. This is the reply to a Ping message. */
2671 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2673 struct lnet_ping_buffer *pbuf;
2676 spin_lock(&lp->lp_lock);
2678 lnet_nid4_to_nid(ev->target.nid, &lp->lp_disc_src_nid);
2679 lnet_nid4_to_nid(ev->source.nid, &lp->lp_disc_dst_nid);
2682 * If some kind of error happened the contents of message
2683 * cannot be used. Set PING_FAILED to trigger a retry.
2686 lp->lp_state |= LNET_PEER_PING_FAILED;
2687 lp->lp_ping_error = ev->status;
2688 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2690 libcfs_nidstr(&lp->lp_primary_nid),
2691 libcfs_nid2str(ev->source.nid));
2695 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2696 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2697 lnet_swap_pinginfo(pbuf);
2700 * A reply with invalid or corrupted info. Set PING_FAILED to
2703 rc = lnet_ping_info_validate(&pbuf->pb_info);
2705 lp->lp_state |= LNET_PEER_PING_FAILED;
2706 lp->lp_ping_error = 0;
2707 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2708 libcfs_nidstr(&lp->lp_primary_nid), rc);
2713 * The peer may have discovery disabled at its end. Set
2714 * NO_DISCOVERY as appropriate.
2716 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) ||
2717 lnet_peer_discovery_disabled) {
2718 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2719 libcfs_nidstr(&lp->lp_primary_nid));
2721 /* Detect whether this peer has toggled discovery from on to
2722 * off and whether we can delete and re-create the peer. Peers
2723 * that were manually configured cannot be deleted by discovery.
2724 * We need to delete this peer and re-create it if the peer was
2725 * not configured manually, is currently considered DD capable,
2727 * 1. We've already discovered the peer (the peer has toggled
2728 * the discovery feature from on to off), or
2729 * 2. The peer is considered MR, but it was not user configured
2730 * (this was a "temporary" peer created via the kernel APIs
2731 * that we're discovering for the first time)
2733 if (!(lp->lp_state & (LNET_PEER_CONFIGURED |
2734 LNET_PEER_NO_DISCOVERY)) &&
2735 (lp->lp_state & (LNET_PEER_DISCOVERED |
2736 LNET_PEER_MULTI_RAIL))) {
2737 CDEBUG(D_NET, "Marking %s:0x%x for deletion\n",
2738 libcfs_nidstr(&lp->lp_primary_nid),
2740 lp->lp_state |= LNET_PEER_MARK_DELETION;
2742 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2744 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2745 libcfs_nidstr(&lp->lp_primary_nid));
2746 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2750 * Update the MULTI_RAIL flag based on the reply. If the peer
2751 * was configured with DLC then the setting should match what
2754 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2755 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2756 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2757 libcfs_nidstr(&lp->lp_primary_nid), lp);
2758 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2759 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2760 libcfs_nidstr(&lp->lp_primary_nid));
2761 } else if (lnet_peer_discovery_disabled) {
2763 "peer %s(%p) not MR: DD disabled locally\n",
2764 libcfs_nidstr(&lp->lp_primary_nid), lp);
2765 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2767 "peer %s(%p) not MR: DD disabled remotely\n",
2768 libcfs_nidstr(&lp->lp_primary_nid), lp);
2770 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2771 libcfs_nidstr(&lp->lp_primary_nid), lp);
2772 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2773 lnet_peer_clr_non_mr_pref_nids(lp);
2775 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2776 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2777 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2778 libcfs_nidstr(&lp->lp_primary_nid));
2780 CERROR("Multi-Rail state vanished from %s\n",
2781 libcfs_nidstr(&lp->lp_primary_nid));
2782 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2787 * Make sure we'll allocate the correct size ping buffer when
2790 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2791 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2794 * Check for truncation of the Reply. Clear PING_SENT and set
2795 * PING_FAILED to trigger a retry.
2797 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2798 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2799 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2800 lp->lp_state |= LNET_PEER_PING_FAILED;
2801 lp->lp_ping_error = 0;
2802 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2803 libcfs_nidstr(&lp->lp_primary_nid),
2804 pbuf->pb_info.pi_nnis);
2809 * Check the sequence numbers in the reply. These are only
2810 * available if the reply came from a Multi-Rail peer.
2812 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2813 pbuf->pb_info.pi_nnis > 1 &&
2814 lnet_nid_to_nid4(&lp->lp_primary_nid) ==
2815 pbuf->pb_info.pi_ni[1].ns_nid) {
2816 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2817 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2818 libcfs_nidstr(&lp->lp_primary_nid),
2819 LNET_PING_BUFFER_SEQNO(pbuf),
2822 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2825 /* We're happy with the state of the data in the buffer. */
2826 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2827 libcfs_nidstr(&lp->lp_primary_nid), lp->lp_peer_seqno,
2829 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2830 lnet_ping_buffer_decref(lp->lp_data);
2832 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2833 lnet_ping_buffer_addref(pbuf);
2836 lp->lp_state &= ~LNET_PEER_PING_SENT;
2837 spin_unlock(&lp->lp_lock);
2839 lnet_net_lock(LNET_LOCK_EX);
2841 * If this peer is a gateway, call the routing callback to
2842 * handle the ping reply
2844 if (lp->lp_rtr_refcount > 0)
2845 lnet_router_discovery_ping_reply(lp);
2846 lnet_net_unlock(LNET_LOCK_EX);
2850 * Send event handling. Only matters for error cases, where we clean
2851 * up state on the peer and peer_ni that would otherwise be updated in
2852 * the REPLY event handler for a successful Ping, and the ACK event
2853 * handler for a successful Push.
2856 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2863 spin_lock(&lp->lp_lock);
2864 if (ev->msg_type == LNET_MSG_GET) {
2865 lp->lp_state &= ~LNET_PEER_PING_SENT;
2866 lp->lp_state |= LNET_PEER_PING_FAILED;
2867 lp->lp_ping_error = ev->status;
2868 } else { /* ev->msg_type == LNET_MSG_PUT */
2869 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2870 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2871 lp->lp_push_error = ev->status;
2873 spin_unlock(&lp->lp_lock);
2874 rc = LNET_REDISCOVER_PEER;
2876 CDEBUG(D_NET, "%s Send to %s: %d\n",
2877 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2878 libcfs_nid2str(ev->target.nid), rc);
2883 * Unlink event handling. This event is only seen if a call to
2884 * LNetMDUnlink() caused the event to be unlinked. If this call was
2885 * made after the event was set up in LNetGet() or LNetPut() then we
2886 * assume the Ping or Push timed out.
2889 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2891 spin_lock(&lp->lp_lock);
2892 /* We've passed through LNetGet() */
2893 if (lp->lp_state & LNET_PEER_PING_SENT) {
2894 lp->lp_state &= ~LNET_PEER_PING_SENT;
2895 lp->lp_state |= LNET_PEER_PING_FAILED;
2896 lp->lp_ping_error = -ETIMEDOUT;
2897 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2898 libcfs_nidstr(&lp->lp_primary_nid));
2900 /* We've passed through LNetPut() */
2901 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2902 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2903 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2904 lp->lp_push_error = -ETIMEDOUT;
2905 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2906 libcfs_nidstr(&lp->lp_primary_nid));
2908 spin_unlock(&lp->lp_lock);
2912 * Event handler for the discovery EQ.
2914 * Called with lnet_res_lock(cpt) held. The cpt is the
2915 * lnet_cpt_of_cookie() of the md handle cookie.
2917 static void lnet_discovery_event_handler(struct lnet_event *event)
2919 struct lnet_peer *lp = event->md_user_ptr;
2920 struct lnet_ping_buffer *pbuf;
2923 /* discovery needs to take another look */
2924 rc = LNET_REDISCOVER_PEER;
2926 CDEBUG(D_NET, "Received event: %d\n", event->type);
2928 switch (event->type) {
2929 case LNET_EVENT_ACK:
2930 lnet_discovery_event_ack(lp, event);
2932 case LNET_EVENT_REPLY:
2933 lnet_discovery_event_reply(lp, event);
2935 case LNET_EVENT_SEND:
2936 /* Only send failure triggers a retry. */
2937 rc = lnet_discovery_event_send(lp, event);
2939 case LNET_EVENT_UNLINK:
2940 /* LNetMDUnlink() was called */
2941 lnet_discovery_event_unlink(lp, event);
2944 /* Invalid events. */
2947 lnet_net_lock(LNET_LOCK_EX);
2948 if (event->unlinked) {
2949 pbuf = LNET_PING_INFO_TO_BUFFER(event->md_start);
2950 lnet_ping_buffer_decref(pbuf);
2951 lnet_peer_decref_locked(lp);
2954 /* put peer back at end of request queue, if discovery not already
2956 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp) &&
2957 lnet_peer_queue_for_discovery(lp)) {
2958 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2959 wake_up(&the_lnet.ln_dc_waitq);
2961 lnet_net_unlock(LNET_LOCK_EX);
2965 * Build a peer from incoming data.
2967 * The NIDs in the incoming data are supposed to be structured as follows:
2970 * - other NIDs in same net
2971 * - NIDs in second net
2972 * - NIDs in third net
2974 * This due to the way the list of NIDs in the data is created.
2976 * Note that this function will mark the peer uptodate unless an
2977 * ENOMEM is encontered. All other errors are due to a conflict
2978 * between the DLC configuration and what discovery sees. We treat DLC
2979 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2980 * peer from becoming stuck in discovery.
2982 static int lnet_peer_merge_data(struct lnet_peer *lp,
2983 struct lnet_ping_buffer *pbuf)
2985 struct lnet_peer_net *lpn;
2986 struct lnet_peer_ni *lpni;
2987 lnet_nid_t *curnis = NULL;
2988 struct lnet_ni_status *addnis = NULL;
2989 lnet_nid_t *delnis = NULL;
2999 flags = LNET_PEER_DISCOVERED;
3000 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
3001 flags |= LNET_PEER_MULTI_RAIL;
3004 * Cache the routing feature for the peer; whether it is enabled
3005 * for disabled as reported by the remote peer.
3007 spin_lock(&lp->lp_lock);
3008 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
3009 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
3011 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
3012 spin_unlock(&lp->lp_lock);
3014 nnis = max_t(int, lp->lp_nnis, pbuf->pb_info.pi_nnis);
3015 CFS_ALLOC_PTR_ARRAY(curnis, nnis);
3016 CFS_ALLOC_PTR_ARRAY(addnis, nnis);
3017 CFS_ALLOC_PTR_ARRAY(delnis, nnis);
3018 if (!curnis || !addnis || !delnis) {
3026 /* Construct the list of NIDs present in peer. */
3028 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
3029 curnis[ncurnis++] = lnet_nid_to_nid4(&lpni->lpni_nid);
3032 * Check for NIDs in pbuf not present in curnis[].
3033 * The loop starts at 1 to skip the loopback NID.
3035 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
3036 for (j = 0; j < ncurnis; j++)
3037 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
3040 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
3043 * Check for NIDs in curnis[] not present in pbuf.
3044 * The nested loop starts at 1 to skip the loopback NID.
3046 * But never add the loopback NID to delnis[]: if it is
3047 * present in curnis[] then this peer is for this node.
3049 for (i = 0; i < ncurnis; i++) {
3050 if (curnis[i] == LNET_NID_LO_0)
3052 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
3053 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
3055 * update the information we cache for the
3056 * peer with the latest information we
3059 lpni = lnet_find_peer_ni_locked(curnis[i]);
3061 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
3062 lnet_peer_ni_decref_locked(lpni);
3067 if (j == pbuf->pb_info.pi_nnis)
3068 delnis[ndelnis++] = curnis[i];
3072 * If we get here and the discovery is disabled then we don't want
3073 * to add or delete any NIs. We just updated the ones we have some
3074 * information on, and call it a day
3077 if (lnet_is_discovery_disabled(lp))
3080 for (i = 0; i < naddnis; i++) {
3081 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
3083 CERROR("Error adding NID %s to peer %s: %d\n",
3084 libcfs_nid2str(addnis[i].ns_nid),
3085 libcfs_nidstr(&lp->lp_primary_nid), rc);
3089 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
3091 lpni->lpni_ns_status = addnis[i].ns_status;
3092 lnet_peer_ni_decref_locked(lpni);
3096 for (i = 0; i < ndelnis; i++) {
3098 * for routers it's okay to delete the primary_nid because
3099 * the upper layers don't really rely on it. So if we're
3100 * being told that the router changed its primary_nid
3101 * then it's okay to delete it.
3103 if (lp->lp_rtr_refcount > 0)
3104 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
3105 rc = lnet_peer_del_nid(lp, delnis[i], flags);
3107 CERROR("Error deleting NID %s from peer %s: %d\n",
3108 libcfs_nid2str(delnis[i]),
3109 libcfs_nidstr(&lp->lp_primary_nid), rc);
3115 /* The peer net for the primary NID should be the first entry in the
3116 * peer's lp_peer_nets list, and the peer NI for the primary NID should
3117 * be the first entry in its peer net's lpn_peer_nis list.
3119 lpni = lnet_find_peer_ni_locked(pbuf->pb_info.pi_ni[1].ns_nid);
3121 CERROR("Internal error: Failed to lookup peer NI for primary NID: %s\n",
3122 libcfs_nid2str(pbuf->pb_info.pi_ni[1].ns_nid));
3126 lnet_peer_ni_decref_locked(lpni);
3128 lpn = lpni->lpni_peer_net;
3129 if (lpn->lpn_peer_nets.prev != &lp->lp_peer_nets)
3130 list_move(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
3132 if (lpni->lpni_peer_nis.prev != &lpni->lpni_peer_net->lpn_peer_nis)
3133 list_move(&lpni->lpni_peer_nis,
3134 &lpni->lpni_peer_net->lpn_peer_nis);
3137 * Errors other than -ENOMEM are due to peers having been
3138 * configured with DLC. Ignore these because DLC overrides
3143 CFS_FREE_PTR_ARRAY(curnis, nnis);
3144 CFS_FREE_PTR_ARRAY(addnis, nnis);
3145 CFS_FREE_PTR_ARRAY(delnis, nnis);
3146 lnet_ping_buffer_decref(pbuf);
3147 CDEBUG(D_NET, "peer %s (%p): %d\n",
3148 libcfs_nidstr(&lp->lp_primary_nid), lp, rc);
3151 spin_lock(&lp->lp_lock);
3152 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
3153 lp->lp_state |= LNET_PEER_FORCE_PING;
3154 spin_unlock(&lp->lp_lock);
3160 * The data in pbuf says lp is its primary peer, but the data was
3161 * received by a different peer. Try to update lp with the data.
3164 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
3166 struct lnet_handle_md mdh;
3168 /* Queue lp for discovery, and force it on the request queue. */
3169 lnet_net_lock(LNET_LOCK_EX);
3170 if (lnet_peer_queue_for_discovery(lp))
3171 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
3172 lnet_net_unlock(LNET_LOCK_EX);
3174 LNetInvalidateMDHandle(&mdh);
3177 * Decide whether we can move the peer to the DATA_PRESENT state.
3179 * We replace stale data for a multi-rail peer, repair PING_FAILED
3180 * status, and preempt FORCE_PING.
3182 * If after that we have DATA_PRESENT, we merge it into this peer.
3184 spin_lock(&lp->lp_lock);
3185 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
3186 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
3187 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
3188 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
3189 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
3190 lnet_ping_buffer_decref(pbuf);
3195 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
3196 lnet_ping_buffer_decref(lp->lp_data);
3198 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
3200 if (lp->lp_state & LNET_PEER_PING_FAILED) {
3201 mdh = lp->lp_ping_mdh;
3202 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3203 lp->lp_state &= ~LNET_PEER_PING_FAILED;
3204 lp->lp_ping_error = 0;
3206 if (lp->lp_state & LNET_PEER_FORCE_PING)
3207 lp->lp_state &= ~LNET_PEER_FORCE_PING;
3208 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
3209 spin_unlock(&lp->lp_lock);
3211 if (!LNetMDHandleIsInvalid(mdh))
3215 return lnet_peer_merge_data(lp, pbuf);
3217 CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
3221 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
3225 for (i = 0; i < pinfo->pi_nnis; i++) {
3226 if (pinfo->pi_ni[i].ns_nid == nid)
3233 /* Delete a peer that has been marked for deletion. NB: when this peer was added
3234 * to the discovery queue a reference was taken that will prevent the peer from
3235 * actually being freed by this function. After this function exits the
3236 * discovery thread should call lnet_peer_discovery_complete() which will
3237 * drop that reference as well as wake any waiters that may also be holding a
3240 static int lnet_peer_deletion(struct lnet_peer *lp)
3241 __must_hold(&lp->lp_lock)
3243 struct list_head rlist;
3244 struct lnet_route *route, *tmp;
3245 int sensitivity = lp->lp_health_sensitivity;
3247 INIT_LIST_HEAD(&rlist);
3249 lp->lp_state &= ~(LNET_PEER_DISCOVERING | LNET_PEER_FORCE_PING |
3250 LNET_PEER_FORCE_PUSH);
3251 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3252 libcfs_nidstr(&lp->lp_primary_nid), lp, lp->lp_state);
3254 /* no-op if lnet_peer_del() has already been called on this peer */
3255 if (lp->lp_state & LNET_PEER_MARK_DELETED)
3258 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
3261 spin_unlock(&lp->lp_lock);
3263 mutex_lock(&the_lnet.ln_api_mutex);
3265 lnet_net_lock(LNET_LOCK_EX);
3266 /* remove the peer from the discovery work
3267 * queue if it's on there in preparation
3270 if (!list_empty(&lp->lp_dc_list))
3271 list_del_init(&lp->lp_dc_list);
3272 list_for_each_entry_safe(route, tmp,
3275 lnet_move_route(route, NULL, &rlist);
3276 lnet_net_unlock(LNET_LOCK_EX);
3278 /* lnet_peer_del() deletes all the peer NIs owned by this peer */
3281 list_for_each_entry_safe(route, tmp,
3283 /* re-add these routes */
3284 lnet_add_route(route->lr_net,
3289 LIBCFS_FREE(route, sizeof(*route));
3292 mutex_unlock(&the_lnet.ln_api_mutex);
3294 spin_lock(&lp->lp_lock);
3300 * Update a peer using the data received.
3302 static int lnet_peer_data_present(struct lnet_peer *lp)
3303 __must_hold(&lp->lp_lock)
3305 struct lnet_ping_buffer *pbuf;
3306 struct lnet_peer_ni *lpni;
3307 lnet_nid_t nid = LNET_NID_ANY;
3313 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
3314 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
3315 spin_unlock(&lp->lp_lock);
3318 * Modifications of peer structures are done while holding the
3319 * ln_api_mutex. A global lock is required because we may be
3320 * modifying multiple peer structures, and a mutex greatly
3321 * simplifies memory management.
3323 * The actual changes to the data structures must also protect
3324 * against concurrent lookups, for which the lnet_net_lock in
3325 * LNET_LOCK_EX mode is used.
3327 mutex_lock(&the_lnet.ln_api_mutex);
3328 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
3334 * If this peer is not on the peer list then it is being torn
3335 * down, and our reference count may be all that is keeping it
3336 * alive. Don't do any work on it.
3338 if (list_empty(&lp->lp_peer_list))
3341 flags = LNET_PEER_DISCOVERED;
3342 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
3343 flags |= LNET_PEER_MULTI_RAIL;
3346 * Check whether the primary NID in the message matches the
3347 * primary NID of the peer. If it does, update the peer, if
3348 * it it does not, check whether there is already a peer with
3349 * that primary NID. If no such peer exists, try to update
3350 * the primary NID of the current peer (allowed if it was
3351 * created due to message traffic) and complete the update.
3352 * If the peer did exist, hand off the data to it.
3354 * The peer for the loopback interface is a special case: this
3355 * is the peer for the local node, and we want to set its
3356 * primary NID to the correct value here. Moreover, this peer
3357 * can show up with only the loopback NID in the ping buffer.
3359 if (pbuf->pb_info.pi_nnis <= 1)
3361 nid = pbuf->pb_info.pi_ni[1].ns_nid;
3362 if (nid_is_lo0(&lp->lp_primary_nid)) {
3363 rc = lnet_peer_set_primary_nid(lp, nid, flags);
3365 rc = lnet_peer_merge_data(lp, pbuf);
3367 * if the primary nid of the peer is present in the ping info returned
3368 * from the peer, but it's not the local primary peer we have
3369 * cached and discovery is disabled, then we don't want to update
3370 * our local peer info, by adding or removing NIDs, we just want
3371 * to update the status of the nids that we currently have
3372 * recorded in that peer.
3374 } else if (lnet_nid_to_nid4(&lp->lp_primary_nid) == nid ||
3375 (lnet_is_nid_in_ping_info(lnet_nid_to_nid4(&lp->lp_primary_nid),
3377 lnet_is_discovery_disabled(lp))) {
3378 rc = lnet_peer_merge_data(lp, pbuf);
3380 lpni = lnet_find_peer_ni_locked(nid);
3381 if (!lpni || lp == lpni->lpni_peer_net->lpn_peer) {
3382 rc = lnet_peer_set_primary_nid(lp, nid, flags);
3384 CERROR("Primary NID error %s versus %s: %d\n",
3385 libcfs_nidstr(&lp->lp_primary_nid),
3386 libcfs_nid2str(nid), rc);
3388 rc = lnet_peer_merge_data(lp, pbuf);
3391 lnet_peer_ni_decref_locked(lpni);
3393 struct lnet_peer *new_lp;
3394 new_lp = lpni->lpni_peer_net->lpn_peer;
3396 * if lp has discovery/MR enabled that means new_lp
3397 * should have discovery/MR enabled as well, since
3398 * it's the same peer, which we're about to merge
3400 spin_lock(&lp->lp_lock);
3401 spin_lock(&new_lp->lp_lock);
3402 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
3403 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
3404 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
3405 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
3406 /* If we're processing a ping reply then we may be
3407 * about to send a push to the peer that we ping'd.
3408 * Since the ping reply that we're processing was
3409 * received by lp, we need to set the discovery source
3410 * NID for new_lp to the NID stored in lp.
3412 if (!LNET_NID_IS_ANY(&lp->lp_disc_src_nid)) {
3413 new_lp->lp_disc_src_nid = lp->lp_disc_src_nid;
3414 new_lp->lp_disc_dst_nid = lp->lp_disc_dst_nid;
3416 spin_unlock(&new_lp->lp_lock);
3417 spin_unlock(&lp->lp_lock);
3419 rc = lnet_peer_set_primary_data(new_lp, pbuf);
3420 lnet_consolidate_routes_locked(lp, new_lp);
3421 lnet_peer_ni_decref_locked(lpni);
3425 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n",
3426 libcfs_nidstr(&lp->lp_primary_nid), lp, rc,
3428 mutex_unlock(&the_lnet.ln_api_mutex);
3430 spin_lock(&lp->lp_lock);
3431 /* Tell discovery to re-check the peer immediately. */
3433 rc = LNET_REDISCOVER_PEER;
3438 * A ping failed. Clear the PING_FAILED state and set the
3439 * FORCE_PING state, to ensure a retry even if discovery is
3440 * disabled. This avoids being left with incorrect state.
3442 static int lnet_peer_ping_failed(struct lnet_peer *lp)
3443 __must_hold(&lp->lp_lock)
3445 struct lnet_handle_md mdh;
3448 mdh = lp->lp_ping_mdh;
3449 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3450 lp->lp_state &= ~LNET_PEER_PING_FAILED;
3451 lp->lp_state |= LNET_PEER_FORCE_PING;
3452 rc = lp->lp_ping_error;
3453 lp->lp_ping_error = 0;
3454 spin_unlock(&lp->lp_lock);
3456 if (!LNetMDHandleIsInvalid(mdh))
3459 CDEBUG(D_NET, "peer %s:%d\n",
3460 libcfs_nidstr(&lp->lp_primary_nid), rc);
3462 spin_lock(&lp->lp_lock);
3463 return rc ? rc : LNET_REDISCOVER_PEER;
3466 /* Active side of ping. */
3467 static int lnet_peer_send_ping(struct lnet_peer *lp)
3468 __must_hold(&lp->lp_lock)
3474 lp->lp_state |= LNET_PEER_PING_SENT;
3475 lp->lp_state &= ~LNET_PEER_FORCE_PING;
3476 spin_unlock(&lp->lp_lock);
3478 cpt = lnet_net_lock_current();
3479 /* Refcount for MD. */
3480 lnet_peer_addref_locked(lp);
3481 lnet_net_unlock(cpt);
3483 nnis = max(lp->lp_data_nnis, LNET_INTERFACES_MIN);
3485 rc = lnet_send_ping(lnet_nid_to_nid4(&lp->lp_primary_nid),
3486 &lp->lp_ping_mdh, nnis, lp,
3487 the_lnet.ln_dc_handler, false);
3490 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3491 * refcount on the peer, otherwise LNetMDUnlink will be called
3492 * which will eventually do that.
3496 lnet_peer_decref_locked(lp);
3497 lnet_net_unlock(cpt);
3498 rc = -rc; /* change the rc to negative value */
3500 } else if (rc < 0) {
3504 CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
3506 spin_lock(&lp->lp_lock);
3510 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nidstr(&lp->lp_primary_nid), rc);
3512 * The errors that get us here are considered hard errors and
3513 * cause Discovery to terminate. So we clear PING_SENT, but do
3514 * not set either PING_FAILED or FORCE_PING. In fact we need
3515 * to clear PING_FAILED, because the unlink event handler will
3516 * have set it if we called LNetMDUnlink() above.
3518 spin_lock(&lp->lp_lock);
3519 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3524 * This function exists because you cannot call LNetMDUnlink() from an
3527 static int lnet_peer_push_failed(struct lnet_peer *lp)
3528 __must_hold(&lp->lp_lock)
3530 struct lnet_handle_md mdh;
3533 mdh = lp->lp_push_mdh;
3534 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3535 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3536 rc = lp->lp_push_error;
3537 lp->lp_push_error = 0;
3538 spin_unlock(&lp->lp_lock);
3540 if (!LNetMDHandleIsInvalid(mdh))
3543 CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
3544 spin_lock(&lp->lp_lock);
3545 return rc ? rc : LNET_REDISCOVER_PEER;
3549 * Mark the peer as discovered.
3551 static int lnet_peer_discovered(struct lnet_peer *lp)
3552 __must_hold(&lp->lp_lock)
3554 lp->lp_state |= LNET_PEER_DISCOVERED;
3555 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3556 LNET_PEER_REDISCOVER);
3558 lp->lp_dc_error = 0;
3560 CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
3565 /* Active side of push. */
3566 static int lnet_peer_send_push(struct lnet_peer *lp)
3567 __must_hold(&lp->lp_lock)
3569 struct lnet_ping_buffer *pbuf;
3570 struct lnet_process_id id;
3575 /* Don't push to a non-multi-rail peer. */
3576 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3577 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3578 /* if peer's NIDs are uptodate then peer is discovered */
3579 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE) {
3580 rc = lnet_peer_discovered(lp);
3587 lp->lp_state |= LNET_PEER_PUSH_SENT;
3588 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3589 spin_unlock(&lp->lp_lock);
3591 cpt = lnet_net_lock_current();
3592 pbuf = the_lnet.ln_ping_target;
3593 lnet_ping_buffer_addref(pbuf);
3594 lnet_net_unlock(cpt);
3596 /* Push source MD */
3597 md.start = &pbuf->pb_info;
3598 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3599 md.threshold = 2; /* Put/Ack */
3601 md.options = LNET_MD_TRACK_RESPONSE;
3602 md.handler = the_lnet.ln_dc_handler;
3605 rc = LNetMDBind(&md, LNET_UNLINK, &lp->lp_push_mdh);
3607 lnet_ping_buffer_decref(pbuf);
3608 CERROR("Can't bind push source MD: %d\n", rc);
3612 cpt = lnet_net_lock_current();
3613 /* Refcount for MD. */
3614 lnet_peer_addref_locked(lp);
3615 id.pid = LNET_PID_LUSTRE;
3616 if (!LNET_NID_IS_ANY(&lp->lp_disc_dst_nid))
3617 id.nid = lnet_nid_to_nid4(&lp->lp_disc_dst_nid);
3619 id.nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
3620 lnet_net_unlock(cpt);
3622 rc = LNetPut(lnet_nid_to_nid4(&lp->lp_disc_src_nid), lp->lp_push_mdh,
3623 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3624 LNET_PROTO_PING_MATCHBITS, 0, 0);
3627 * reset the discovery nid. There is no need to restrict sending
3628 * from that source, if we call lnet_push_update_to_peers(). It'll
3629 * get set to a specific NID, if we initiate discovery from the
3632 lp->lp_disc_src_nid = LNET_ANY_NID;
3633 lp->lp_disc_dst_nid = LNET_ANY_NID;
3638 CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
3640 spin_lock(&lp->lp_lock);
3644 LNetMDUnlink(lp->lp_push_mdh);
3645 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3647 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nidstr(&lp->lp_primary_nid),
3650 * The errors that get us here are considered hard errors and
3651 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3652 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3653 * because the unlink event handler will have set it if we
3654 * called LNetMDUnlink() above.
3656 spin_lock(&lp->lp_lock);
3657 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3662 * An unrecoverable error was encountered during discovery.
3663 * Set error status in peer and abort discovery.
3665 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3667 CDEBUG(D_NET, "Discovery error %s: %d\n",
3668 libcfs_nidstr(&lp->lp_primary_nid), error);
3670 spin_lock(&lp->lp_lock);
3671 lp->lp_dc_error = error;
3672 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3673 lp->lp_state |= LNET_PEER_REDISCOVER;
3674 spin_unlock(&lp->lp_lock);
3678 * Wait for work to be queued or some other change that must be
3679 * attended to. Returns non-zero if the discovery thread should shut
3682 static int lnet_peer_discovery_wait_for_work(void)
3689 cpt = lnet_net_lock_current();
3691 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3692 TASK_INTERRUPTIBLE);
3693 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3695 if (lnet_push_target_resize_needed() ||
3696 the_lnet.ln_push_target->pb_needs_post)
3698 if (!list_empty(&the_lnet.ln_dc_request))
3700 if (!list_empty(&the_lnet.ln_msg_resend))
3702 lnet_net_unlock(cpt);
3705 * wakeup max every second to check if there are peers that
3706 * have been stuck on the working queue for greater than
3709 schedule_timeout(cfs_time_seconds(1));
3710 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3711 cpt = lnet_net_lock_current();
3713 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3715 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3718 lnet_net_unlock(cpt);
3720 CDEBUG(D_NET, "woken: %d\n", rc);
3726 * Messages that were pending on a destroyed peer will be put on a global
3727 * resend list. The message resend list will be checked by
3728 * the discovery thread when it wakes up, and will resend messages. These
3729 * messages can still be sendable in the case the lpni which was the initial
3730 * cause of the message re-queue was transfered to another peer.
3732 * It is possible that LNet could be shutdown while we're iterating
3733 * through the list. lnet_shudown_lndnets() will attempt to access the
3734 * resend list, but will have to wait until the spinlock is released, by
3735 * which time there shouldn't be any more messages on the resend list.
3736 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3737 * for the messages so they can be released. The other case is that
3738 * lnet_shudown_lndnets() can finalize all the messages before this
3739 * function can visit the resend list, in which case this function will be
3742 static void lnet_resend_msgs(void)
3744 struct lnet_msg *msg, *tmp;
3748 spin_lock(&the_lnet.ln_msg_resend_lock);
3749 list_splice(&the_lnet.ln_msg_resend, &resend);
3750 spin_unlock(&the_lnet.ln_msg_resend_lock);
3752 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3753 list_del_init(&msg->msg_list);
3754 rc = lnet_send(msg->msg_src_nid_param, msg,
3755 msg->msg_rtr_nid_param);
3757 CNETERR("Error sending %s to %s: %d\n",
3758 lnet_msgtyp2str(msg->msg_type),
3759 libcfs_id2str(msg->msg_target), rc);
3760 lnet_finalize(msg, rc);
3765 /* The discovery thread. */
3766 static int lnet_peer_discovery(void *arg)
3768 struct lnet_peer *lp;
3771 wait_for_completion(&the_lnet.ln_started);
3773 CDEBUG(D_NET, "started\n");
3776 if (lnet_peer_discovery_wait_for_work())
3779 if (lnet_push_target_resize_needed())
3780 lnet_push_target_resize();
3781 else if (the_lnet.ln_push_target->pb_needs_post)
3782 lnet_push_target_post(the_lnet.ln_push_target,
3783 &the_lnet.ln_push_target_md);
3787 lnet_net_lock(LNET_LOCK_EX);
3788 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING) {
3789 lnet_net_unlock(LNET_LOCK_EX);
3794 * Process all incoming discovery work requests. When
3795 * discovery must wait on a peer to change state, it
3796 * is added to the tail of the ln_dc_working queue. A
3797 * timestamp keeps track of when the peer was added,
3798 * so we can time out discovery requests that take too
3801 while (!list_empty(&the_lnet.ln_dc_request)) {
3802 lp = list_first_entry(&the_lnet.ln_dc_request,
3803 struct lnet_peer, lp_dc_list);
3804 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3806 * set the time the peer was put on the dc_working
3807 * queue. It shouldn't remain on the queue
3808 * forever, in case the GET message (for ping)
3809 * doesn't get a REPLY or the PUT message (for
3810 * push) doesn't get an ACK.
3812 lp->lp_last_queued = ktime_get_real_seconds();
3813 lnet_net_unlock(LNET_LOCK_EX);
3815 if (lnet_push_target_resize_needed())
3816 lnet_push_target_resize();
3817 else if (the_lnet.ln_push_target->pb_needs_post)
3818 lnet_push_target_post(the_lnet.ln_push_target,
3819 &the_lnet.ln_push_target_md);
3822 * Select an action depending on the state of
3823 * the peer and whether discovery is disabled.
3824 * The check whether discovery is disabled is
3825 * done after the code that handles processing
3826 * for arrived data, cleanup for failures, and
3827 * forcing a Ping or Push.
3829 spin_lock(&lp->lp_lock);
3830 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3831 libcfs_nidstr(&lp->lp_primary_nid), lp,
3833 if (lp->lp_state & (LNET_PEER_MARK_DELETION |
3834 LNET_PEER_MARK_DELETED))
3835 rc = lnet_peer_deletion(lp);
3836 else if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3837 rc = lnet_peer_data_present(lp);
3838 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3839 rc = lnet_peer_ping_failed(lp);
3840 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3841 rc = lnet_peer_push_failed(lp);
3842 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3843 rc = lnet_peer_send_ping(lp);
3844 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3845 rc = lnet_peer_send_push(lp);
3846 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3847 rc = lnet_peer_send_ping(lp);
3848 else if (lnet_peer_needs_push(lp))
3849 rc = lnet_peer_send_push(lp);
3851 rc = lnet_peer_discovered(lp);
3852 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3853 libcfs_nidstr(&lp->lp_primary_nid), lp,
3855 spin_unlock(&lp->lp_lock);
3857 lnet_net_lock(LNET_LOCK_EX);
3858 if (rc == LNET_REDISCOVER_PEER) {
3859 list_move(&lp->lp_dc_list,
3860 &the_lnet.ln_dc_request);
3862 lnet_peer_discovery_error(lp, rc);
3864 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3865 lnet_peer_discovery_complete(lp);
3866 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3871 lnet_net_unlock(LNET_LOCK_EX);
3874 CDEBUG(D_NET, "stopping\n");
3876 * Clean up before telling lnet_peer_discovery_stop() that
3877 * we're done. Use wake_up() below to somewhat reduce the
3878 * size of the thundering herd if there are multiple threads
3879 * waiting on discovery of a single peer.
3882 /* Queue cleanup 1: stop all pending pings and pushes. */
3883 lnet_net_lock(LNET_LOCK_EX);
3884 while (!list_empty(&the_lnet.ln_dc_working)) {
3885 lp = list_first_entry(&the_lnet.ln_dc_working,
3886 struct lnet_peer, lp_dc_list);
3887 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3888 lnet_net_unlock(LNET_LOCK_EX);
3889 lnet_peer_cancel_discovery(lp);
3890 lnet_net_lock(LNET_LOCK_EX);
3892 lnet_net_unlock(LNET_LOCK_EX);
3894 /* Queue cleanup 2: wait for the expired queue to clear. */
3895 while (!list_empty(&the_lnet.ln_dc_expired))
3896 schedule_timeout_uninterruptible(cfs_time_seconds(1));
3898 /* Queue cleanup 3: clear the request queue. */
3899 lnet_net_lock(LNET_LOCK_EX);
3900 while (!list_empty(&the_lnet.ln_dc_request)) {
3901 lp = list_first_entry(&the_lnet.ln_dc_request,
3902 struct lnet_peer, lp_dc_list);
3903 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3904 lnet_peer_discovery_complete(lp);
3906 lnet_net_unlock(LNET_LOCK_EX);
3908 lnet_assert_handler_unused(the_lnet.ln_dc_handler);
3909 the_lnet.ln_dc_handler = NULL;
3911 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3912 wake_up(&the_lnet.ln_dc_waitq);
3914 CDEBUG(D_NET, "stopped\n");
3919 /* ln_api_mutex is held on entry. */
3920 int lnet_peer_discovery_start(void)
3922 struct task_struct *task;
3925 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3928 the_lnet.ln_dc_handler = lnet_discovery_event_handler;
3929 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3930 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3933 CERROR("Can't start peer discovery thread: %d\n", rc);
3935 the_lnet.ln_dc_handler = NULL;
3937 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3940 CDEBUG(D_NET, "discovery start: %d\n", rc);
3945 /* ln_api_mutex is held on entry. */
3946 void lnet_peer_discovery_stop(void)
3948 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3951 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3952 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3954 /* In the LNetNIInit() path we may be stopping discovery before it
3955 * entered its work loop
3957 if (!completion_done(&the_lnet.ln_started))
3958 complete(&the_lnet.ln_started);
3960 wake_up(&the_lnet.ln_dc_waitq);
3962 wait_event(the_lnet.ln_dc_waitq,
3963 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3965 LASSERT(list_empty(&the_lnet.ln_dc_request));
3966 LASSERT(list_empty(&the_lnet.ln_dc_working));
3967 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3969 CDEBUG(D_NET, "discovery stopped\n");
3975 lnet_debug_peer(lnet_nid_t nid)
3977 char *aliveness = "NA";
3978 struct lnet_peer_ni *lp;
3981 cpt = lnet_cpt_of_nid(nid, NULL);
3984 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3986 lnet_net_unlock(cpt);
3987 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3991 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3992 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3994 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3995 libcfs_nidstr(&lp->lpni_nid), kref_read(&lp->lpni_kref),
3996 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3997 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3998 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
4000 lnet_peer_ni_decref_locked(lp);
4002 lnet_net_unlock(cpt);
4005 /* Gathering information for userspace. */
4007 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
4008 char aliveness[LNET_MAX_STR_LEN],
4009 __u32 *cpt_iter, __u32 *refcount,
4010 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
4011 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
4012 __u32 *peer_tx_qnob)
4014 struct lnet_peer_table *peer_table;
4015 struct lnet_peer_ni *lp;
4020 /* get the number of CPTs */
4021 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
4023 /* if the cpt number to be examined is >= the number of cpts in
4024 * the system then indicate that there are no more cpts to examin
4026 if (*cpt_iter >= lncpt)
4029 /* get the current table */
4030 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
4031 /* if the ptable is NULL then there are no more cpts to examine */
4032 if (peer_table == NULL)
4035 lnet_net_lock(*cpt_iter);
4037 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
4038 struct list_head *peers = &peer_table->pt_hash[j];
4040 list_for_each_entry(lp, peers, lpni_hashlist) {
4041 if (!nid_is_nid4(&lp->lpni_nid))
4043 if (peer_index-- > 0)
4046 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
4047 if (lnet_isrouter(lp) ||
4048 lnet_peer_aliveness_enabled(lp))
4049 snprintf(aliveness, LNET_MAX_STR_LEN,
4050 lnet_is_peer_ni_alive(lp) ? "up" : "down");
4052 *nid = lnet_nid_to_nid4(&lp->lpni_nid);
4053 *refcount = kref_read(&lp->lpni_kref);
4054 *ni_peer_tx_credits =
4055 lp->lpni_net->net_tunables.lct_peer_tx_credits;
4056 *peer_tx_credits = lp->lpni_txcredits;
4057 *peer_rtr_credits = lp->lpni_rtrcredits;
4058 *peer_min_rtr_credits = lp->lpni_mintxcredits;
4059 *peer_tx_qnob = lp->lpni_txqnob;
4065 lnet_net_unlock(*cpt_iter);
4069 return found ? 0 : -ENOENT;
4072 /* ln_api_mutex is held, which keeps the peer list stable */
4073 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
4075 struct lnet_ioctl_element_stats *lpni_stats;
4076 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
4077 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
4078 struct lnet_peer_ni_credit_info *lpni_info;
4079 struct lnet_peer_ni *lpni;
4080 struct lnet_peer *lp;
4085 lp = lnet_find_peer(cfg->prcfg_prim_nid);
4092 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
4093 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
4094 size *= lp->lp_nnis;
4095 if (size > cfg->prcfg_size) {
4096 cfg->prcfg_size = size;
4101 cfg->prcfg_prim_nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
4102 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
4103 cfg->prcfg_cfg_nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
4104 cfg->prcfg_count = lp->lp_nnis;
4105 cfg->prcfg_size = size;
4106 cfg->prcfg_state = lp->lp_state;
4108 /* Allocate helper buffers. */
4110 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
4113 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
4116 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
4117 if (!lpni_msg_stats)
4118 goto out_free_stats;
4119 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
4121 goto out_free_msg_stats;
4126 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
4127 if (!nid_is_nid4(&lpni->lpni_nid))
4129 nid = lnet_nid_to_nid4(&lpni->lpni_nid);
4130 if (copy_to_user(bulk, &nid, sizeof(nid)))
4131 goto out_free_hstats;
4132 bulk += sizeof(nid);
4134 memset(lpni_info, 0, sizeof(*lpni_info));
4135 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
4136 if (lnet_isrouter(lpni) ||
4137 lnet_peer_aliveness_enabled(lpni))
4138 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
4139 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
4141 lpni_info->cr_refcount = kref_read(&lpni->lpni_kref);
4142 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
4143 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
4144 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
4145 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
4146 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
4147 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
4148 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
4149 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
4150 goto out_free_hstats;
4151 bulk += sizeof(*lpni_info);
4153 memset(lpni_stats, 0, sizeof(*lpni_stats));
4154 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
4155 LNET_STATS_TYPE_SEND);
4156 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
4157 LNET_STATS_TYPE_RECV);
4158 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
4159 LNET_STATS_TYPE_DROP);
4160 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
4161 goto out_free_hstats;
4162 bulk += sizeof(*lpni_stats);
4163 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
4164 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
4165 goto out_free_hstats;
4166 bulk += sizeof(*lpni_msg_stats);
4167 lpni_hstats->hlpni_network_timeout =
4168 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
4169 lpni_hstats->hlpni_remote_dropped =
4170 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
4171 lpni_hstats->hlpni_remote_timeout =
4172 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
4173 lpni_hstats->hlpni_remote_error =
4174 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
4175 lpni_hstats->hlpni_health_value =
4176 atomic_read(&lpni->lpni_healthv);
4177 lpni_hstats->hlpni_ping_count = lpni->lpni_ping_count;
4178 lpni_hstats->hlpni_next_ping = lpni->lpni_next_ping;
4179 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
4180 goto out_free_hstats;
4181 bulk += sizeof(*lpni_hstats);
4186 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
4188 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
4190 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
4192 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
4194 lnet_peer_decref_locked(lp);
4199 /* must hold net_lock/0 */
4201 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni,
4202 struct list_head *recovery_queue,
4205 /* the mt could've shutdown and cleaned up the queues */
4206 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
4209 if (!list_empty(&lpni->lpni_recovery))
4212 if (atomic_read(&lpni->lpni_healthv) == LNET_MAX_HEALTH_VALUE)
4215 if (!lpni->lpni_last_alive) {
4217 "lpni %s(%p) not eligible for recovery last alive %lld\n",
4218 libcfs_nidstr(&lpni->lpni_nid), lpni,
4219 lpni->lpni_last_alive);
4223 if (lnet_recovery_limit &&
4224 now > lpni->lpni_last_alive + lnet_recovery_limit) {
4225 CDEBUG(D_NET, "lpni %s aged out last alive %lld\n",
4226 libcfs_nidstr(&lpni->lpni_nid),
4227 lpni->lpni_last_alive);
4228 /* Reset the ping count so that if this peer NI is added back to
4229 * the recovery queue we will send the first ping right away.
4231 lpni->lpni_ping_count = 0;
4235 /* This peer NI is going on the recovery queue, so take a ref on it */
4236 lnet_peer_ni_addref_locked(lpni);
4238 lnet_peer_ni_set_next_ping(lpni, now);
4240 CDEBUG(D_NET, "%s added to recovery queue. ping count: %u next ping: %lld last alive: %lld health: %d\n",
4241 libcfs_nidstr(&lpni->lpni_nid),
4242 lpni->lpni_ping_count,
4243 lpni->lpni_next_ping,
4244 lpni->lpni_last_alive,
4245 atomic_read(&lpni->lpni_healthv));
4247 list_add_tail(&lpni->lpni_recovery, recovery_queue);
4250 /* Call with the ln_api_mutex held */
4252 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
4254 struct lnet_peer_table *ptable;
4255 struct lnet_peer *lp;
4256 struct lnet_peer_net *lpn;
4257 struct lnet_peer_ni *lpni;
4262 if (the_lnet.ln_state != LNET_STATE_RUNNING)
4265 now = ktime_get_seconds();
4268 lnet_net_lock(LNET_LOCK_EX);
4269 lpni = lnet_find_peer_ni_locked(nid);
4271 lnet_net_unlock(LNET_LOCK_EX);
4274 lnet_set_lpni_healthv_locked(lpni, value);
4275 lnet_peer_ni_add_to_recoveryq_locked(lpni,
4276 &the_lnet.ln_mt_peerNIRecovq, now);
4277 lnet_peer_ni_decref_locked(lpni);
4278 lnet_net_unlock(LNET_LOCK_EX);
4282 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
4285 * Walk all the peers and reset the health value for each one to the
4288 lnet_net_lock(LNET_LOCK_EX);
4289 for (cpt = 0; cpt < lncpt; cpt++) {
4290 ptable = the_lnet.ln_peer_tables[cpt];
4291 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
4292 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
4293 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
4295 lnet_set_lpni_healthv_locked(lpni,
4297 lnet_peer_ni_add_to_recoveryq_locked(lpni,
4298 &the_lnet.ln_mt_peerNIRecovq, now);
4303 lnet_net_unlock(LNET_LOCK_EX);