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, 2014, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
35 #define DEBUG_SUBSYSTEM S_LNET
37 #include <lnet/lib-lnet.h>
38 #include <lnet/lib-dlc.h>
41 lnet_peer_remove_from_remote_list(struct lnet_peer_ni *lpni)
43 if (!list_empty(&lpni->lpni_on_remote_peer_ni_list)) {
44 list_del_init(&lpni->lpni_on_remote_peer_ni_list);
45 lnet_peer_ni_decref_locked(lpni);
50 lnet_peer_net_added(struct lnet_net *net)
52 struct lnet_peer_ni *lpni, *tmp;
54 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
55 lpni_on_remote_peer_ni_list) {
57 if (LNET_NIDNET(lpni->lpni_nid) == net->net_id) {
59 lpni->lpni_txcredits =
60 lpni->lpni_mintxcredits =
61 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
62 lpni->lpni_rtrcredits =
63 lpni->lpni_minrtrcredits =
64 lnet_peer_buffer_credits(lpni->lpni_net);
66 lnet_peer_remove_from_remote_list(lpni);
72 lnet_peer_tables_destroy(void)
74 struct lnet_peer_table *ptable;
75 struct list_head *hash;
79 if (!the_lnet.ln_peer_tables)
82 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
83 hash = ptable->pt_hash;
84 if (!hash) /* not intialized */
87 ptable->pt_hash = NULL;
88 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
89 LASSERT(list_empty(&hash[j]));
91 LIBCFS_FREE(hash, LNET_PEER_HASH_SIZE * sizeof(*hash));
94 cfs_percpt_free(the_lnet.ln_peer_tables);
95 the_lnet.ln_peer_tables = NULL;
99 lnet_peer_tables_create(void)
101 struct lnet_peer_table *ptable;
102 struct list_head *hash;
106 the_lnet.ln_peer_tables = cfs_percpt_alloc(lnet_cpt_table(),
108 if (the_lnet.ln_peer_tables == NULL) {
109 CERROR("Failed to allocate cpu-partition peer tables\n");
113 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
114 LIBCFS_CPT_ALLOC(hash, lnet_cpt_table(), i,
115 LNET_PEER_HASH_SIZE * sizeof(*hash));
117 CERROR("Failed to create peer hash table\n");
118 lnet_peer_tables_destroy();
122 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
123 INIT_LIST_HEAD(&hash[j]);
124 ptable->pt_hash = hash; /* sign of initialization */
130 void lnet_peer_uninit()
133 struct lnet_peer_ni *lpni, *tmp;
134 struct lnet_peer_table *ptable = NULL;
136 /* remove all peer_nis from the remote peer and he hash list */
137 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
138 lpni_on_remote_peer_ni_list) {
139 list_del_init(&lpni->lpni_on_remote_peer_ni_list);
140 lnet_peer_ni_decref_locked(lpni);
142 cpt = lnet_cpt_of_nid_locked(lpni->lpni_nid, NULL);
143 ptable = the_lnet.ln_peer_tables[cpt];
144 ptable->pt_zombies++;
146 list_del_init(&lpni->lpni_hashlist);
147 lnet_peer_ni_decref_locked(lpni);
150 lnet_peer_tables_destroy();
154 lnet_peer_table_cleanup_locked(lnet_ni_t *ni, struct lnet_peer_table *ptable)
157 struct lnet_peer_ni *lp;
158 struct lnet_peer_ni *tmp;
160 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
161 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
163 if (ni != NULL && ni->ni_net != lp->lpni_net)
165 list_del_init(&lp->lpni_hashlist);
166 /* Lose hash table's ref */
167 ptable->pt_zombies++;
168 lnet_peer_ni_decref_locked(lp);
174 lnet_peer_table_finalize_wait_locked(struct lnet_peer_table *ptable,
179 for (i = 3; ptable->pt_zombies != 0; i++) {
180 lnet_net_unlock(cpt_locked);
184 "Waiting for %d zombies on peer table\n",
187 set_current_state(TASK_UNINTERRUPTIBLE);
188 schedule_timeout(cfs_time_seconds(1) >> 1);
189 lnet_net_lock(cpt_locked);
194 lnet_peer_table_del_rtrs_locked(lnet_ni_t *ni, struct lnet_peer_table *ptable,
197 struct lnet_peer_ni *lp;
198 struct lnet_peer_ni *tmp;
202 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
203 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
205 if (ni->ni_net != lp->lpni_net)
208 if (lp->lpni_rtr_refcount == 0)
211 lpni_nid = lp->lpni_nid;
213 lnet_net_unlock(cpt_locked);
214 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), lpni_nid);
215 lnet_net_lock(cpt_locked);
221 lnet_peer_tables_cleanup(lnet_ni_t *ni)
224 struct lnet_peer_table *ptable;
226 LASSERT(the_lnet.ln_shutdown || ni != NULL);
227 /* If just deleting the peers for a NI, get rid of any routes these
228 * peers are gateways for. */
229 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
230 lnet_net_lock(LNET_LOCK_EX);
231 lnet_peer_table_del_rtrs_locked(ni, ptable, i);
232 lnet_net_unlock(LNET_LOCK_EX);
235 /* Start the cleanup process */
236 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
237 lnet_net_lock(LNET_LOCK_EX);
238 lnet_peer_table_cleanup_locked(ni, ptable);
239 lnet_net_unlock(LNET_LOCK_EX);
242 /* Wait until all peers have been destroyed. */
243 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
244 lnet_net_lock(LNET_LOCK_EX);
245 lnet_peer_table_finalize_wait_locked(ptable, i);
246 lnet_net_unlock(LNET_LOCK_EX);
250 static struct lnet_peer_ni *
251 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
253 struct list_head *peers;
254 struct lnet_peer_ni *lp;
256 LASSERT(!the_lnet.ln_shutdown);
258 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
259 list_for_each_entry(lp, peers, lpni_hashlist) {
260 if (lp->lpni_nid == nid) {
261 lnet_peer_ni_addref_locked(lp);
269 struct lnet_peer_ni *
270 lnet_find_peer_ni_locked(lnet_nid_t nid)
272 struct lnet_peer_ni *lpni;
273 struct lnet_peer_table *ptable;
276 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
278 ptable = the_lnet.ln_peer_tables[cpt];
279 lpni = lnet_get_peer_ni_locked(ptable, nid);
285 lnet_find_or_create_peer_locked(lnet_nid_t dst_nid, int cpt, struct lnet_peer **peer)
287 struct lnet_peer_ni *lpni;
289 lpni = lnet_find_peer_ni_locked(dst_nid);
292 rc = lnet_nid2peerni_locked(&lpni, dst_nid, cpt);
297 *peer = lpni->lpni_peer_net->lpn_peer;
298 lnet_peer_ni_decref_locked(lpni);
303 struct lnet_peer_ni *
304 lnet_get_peer_ni_idx_locked(int idx, struct lnet_peer_net **lpn,
305 struct lnet_peer **lp)
307 struct lnet_peer_ni *lpni;
309 list_for_each_entry((*lp), &the_lnet.ln_peers, lp_on_lnet_peer_list) {
310 list_for_each_entry((*lpn), &((*lp)->lp_peer_nets), lpn_on_peer_list) {
311 list_for_each_entry(lpni, &((*lpn)->lpn_peer_nis),
312 lpni_on_peer_net_list)
321 struct lnet_peer_ni *
322 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
323 struct lnet_peer_net *peer_net,
324 struct lnet_peer_ni *prev)
326 struct lnet_peer_ni *lpni;
327 struct lnet_peer_net *net = peer_net;
331 net = list_entry(peer->lp_peer_nets.next,
332 struct lnet_peer_net,
334 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
335 lpni_on_peer_net_list);
340 if (prev->lpni_on_peer_net_list.next ==
341 &prev->lpni_peer_net->lpn_peer_nis) {
343 * if you reached the end of the peer ni list and the peer
344 * net is specified then there are no more peer nis in that
351 * we reached the end of this net ni list. move to the
354 if (prev->lpni_peer_net->lpn_on_peer_list.next ==
356 /* no more nets and no more NIs. */
359 /* get the next net */
360 net = list_entry(prev->lpni_peer_net->lpn_on_peer_list.next,
361 struct lnet_peer_net,
363 /* get the ni on it */
364 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
365 lpni_on_peer_net_list);
370 /* there are more nis left */
371 lpni = list_entry(prev->lpni_on_peer_net_list.next,
372 struct lnet_peer_ni, lpni_on_peer_net_list);
378 lnet_peer_is_ni_pref_locked(struct lnet_peer_ni *lpni, struct lnet_ni *ni)
382 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
383 if (lpni->lpni_pref_nids[i] == ni->ni_nid)
390 lnet_peer_primary_nid(lnet_nid_t nid)
392 struct lnet_peer_ni *lpni;
393 lnet_nid_t primary_nid = nid;
396 cpt = lnet_net_lock_current();
397 lpni = lnet_find_peer_ni_locked(nid);
399 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
400 lnet_peer_ni_decref_locked(lpni);
402 lnet_net_unlock(cpt);
408 lnet_try_destroy_peer_hierarchy_locked(struct lnet_peer_ni *lpni)
410 struct lnet_peer_net *peer_net;
411 struct lnet_peer *peer;
413 /* TODO: could the below situation happen? accessing an already
415 if (lpni->lpni_peer_net == NULL ||
416 lpni->lpni_peer_net->lpn_peer == NULL)
419 peer_net = lpni->lpni_peer_net;
420 peer = lpni->lpni_peer_net->lpn_peer;
422 list_del_init(&lpni->lpni_on_peer_net_list);
423 lpni->lpni_peer_net = NULL;
425 /* if peer_net is empty, then remove it from the peer */
426 if (list_empty(&peer_net->lpn_peer_nis)) {
427 list_del_init(&peer_net->lpn_on_peer_list);
428 peer_net->lpn_peer = NULL;
429 LIBCFS_FREE(peer_net, sizeof(*peer_net));
431 /* if the peer is empty then remove it from the
432 * the_lnet.ln_peers */
433 if (list_empty(&peer->lp_peer_nets)) {
434 list_del_init(&peer->lp_on_lnet_peer_list);
435 LIBCFS_FREE(peer, sizeof(*peer));
441 lnet_build_peer_hierarchy(struct lnet_peer_ni *lpni)
443 struct lnet_peer *peer;
444 struct lnet_peer_net *peer_net;
445 __u32 lpni_net = LNET_NIDNET(lpni->lpni_nid);
450 LIBCFS_ALLOC(peer, sizeof(*peer));
454 LIBCFS_ALLOC(peer_net, sizeof(*peer_net));
455 if (peer_net == NULL) {
456 LIBCFS_FREE(peer, sizeof(*peer));
460 INIT_LIST_HEAD(&peer->lp_on_lnet_peer_list);
461 INIT_LIST_HEAD(&peer->lp_peer_nets);
462 INIT_LIST_HEAD(&peer_net->lpn_on_peer_list);
463 INIT_LIST_HEAD(&peer_net->lpn_peer_nis);
465 /* build the hierarchy */
466 peer_net->lpn_net_id = lpni_net;
467 peer_net->lpn_peer = peer;
468 lpni->lpni_peer_net = peer_net;
469 peer->lp_primary_nid = lpni->lpni_nid;
470 peer->lp_multi_rail = false;
471 list_add_tail(&peer_net->lpn_on_peer_list, &peer->lp_peer_nets);
472 list_add_tail(&lpni->lpni_on_peer_net_list, &peer_net->lpn_peer_nis);
473 list_add_tail(&peer->lp_on_lnet_peer_list, &the_lnet.ln_peers);
478 struct lnet_peer_net *
479 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
481 struct lnet_peer_net *peer_net;
482 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_on_peer_list) {
483 if (peer_net->lpn_net_id == net_id)
490 * given the key nid find the peer to add the new peer NID to. If the key
491 * nid is NULL, then create a new peer, but first make sure that the NID
495 lnet_add_peer_ni_to_peer(lnet_nid_t key_nid, lnet_nid_t nid, bool mr)
497 struct lnet_peer_ni *lpni, *lpni2;
498 struct lnet_peer *peer;
499 struct lnet_peer_net *peer_net, *pn;
501 struct lnet_peer_table *ptable = NULL;
502 __u32 net_id = LNET_NIDNET(nid);
504 if (nid == LNET_NID_ANY)
507 /* check that nid is unique */
508 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
510 lpni = lnet_find_peer_ni_locked(nid);
512 lnet_peer_ni_decref_locked(lpni);
513 lnet_net_unlock(cpt);
516 lnet_net_unlock(cpt);
518 if (key_nid != LNET_NID_ANY) {
519 cpt2 = lnet_nid_cpt_hash(key_nid, LNET_CPT_NUMBER);
521 lpni = lnet_find_peer_ni_locked(key_nid);
523 lnet_net_unlock(cpt2);
524 /* key_nid refers to a non-existant peer_ni.*/
527 peer = lpni->lpni_peer_net->lpn_peer;
528 peer->lp_multi_rail = mr;
529 lnet_peer_ni_decref_locked(lpni);
530 lnet_net_unlock(cpt2);
532 lnet_net_lock(LNET_LOCK_EX);
533 rc = lnet_nid2peerni_locked(&lpni, nid, LNET_LOCK_EX);
535 lpni->lpni_peer_net->lpn_peer->lp_multi_rail = mr;
536 lnet_peer_ni_decref_locked(lpni);
538 lnet_net_unlock(LNET_LOCK_EX);
544 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt, sizeof(*lpni));
548 INIT_LIST_HEAD(&lpni->lpni_txq);
549 INIT_LIST_HEAD(&lpni->lpni_rtrq);
550 INIT_LIST_HEAD(&lpni->lpni_routes);
551 INIT_LIST_HEAD(&lpni->lpni_hashlist);
552 INIT_LIST_HEAD(&lpni->lpni_on_peer_net_list);
553 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
555 lpni->lpni_alive = !lnet_peers_start_down(); /* 1 bit!! */
556 lpni->lpni_last_alive = cfs_time_current(); /* assumes alive */
557 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
558 lpni->lpni_nid = nid;
559 lpni->lpni_cpt = cpt;
560 lnet_set_peer_ni_health_locked(lpni, true);
562 /* allocate here in case we need to add a new peer_net */
564 LIBCFS_ALLOC(peer_net, sizeof(*peer_net));
565 if (peer_net == NULL) {
568 LIBCFS_FREE(lpni, sizeof(*lpni));
572 lnet_net_lock(LNET_LOCK_EX);
574 ptable = the_lnet.ln_peer_tables[cpt];
577 lpni2 = lnet_find_peer_ni_locked(nid);
579 lnet_peer_ni_decref_locked(lpni2);
580 /* sanity check that lpni2's peer is what we expect */
581 if (lpni2->lpni_peer_net->lpn_peer != peer)
587 /* another thread has already added it */
588 lnet_net_unlock(LNET_LOCK_EX);
589 LIBCFS_FREE(peer_net, sizeof(*peer_net));
593 lpni->lpni_net = lnet_get_net_locked(LNET_NIDNET(lpni->lpni_nid));
594 if (lpni->lpni_net != NULL) {
595 lpni->lpni_txcredits =
596 lpni->lpni_mintxcredits =
597 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
598 lpni->lpni_rtrcredits =
599 lpni->lpni_minrtrcredits = lnet_peer_buffer_credits(lpni->lpni_net);
602 * if you're adding a peer which is not on a local network
603 * then we can't assign any of the credits. It won't be
604 * picked for sending anyway. Eventually a network can be
605 * added, in this case we need to revisit this peer and
606 * update its credits.
609 /* increment refcount for remote peer list */
610 atomic_inc(&lpni->lpni_refcount);
611 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
612 &the_lnet.ln_remote_peer_ni_list);
615 /* increment refcount for peer on hash list */
616 atomic_inc(&lpni->lpni_refcount);
618 list_add_tail(&lpni->lpni_hashlist,
619 &ptable->pt_hash[lnet_nid2peerhash(nid)]);
620 ptable->pt_version++;
622 /* add the lpni to a net */
623 list_for_each_entry(pn, &peer->lp_peer_nets, lpn_on_peer_list) {
624 if (pn->lpn_net_id == net_id) {
625 list_add_tail(&lpni->lpni_on_peer_net_list,
627 lpni->lpni_peer_net = pn;
628 lnet_net_unlock(LNET_LOCK_EX);
629 LIBCFS_FREE(peer_net, sizeof(*peer_net));
634 INIT_LIST_HEAD(&peer_net->lpn_on_peer_list);
635 INIT_LIST_HEAD(&peer_net->lpn_peer_nis);
637 /* build the hierarchy */
638 peer_net->lpn_net_id = net_id;
639 peer_net->lpn_peer = peer;
640 lpni->lpni_peer_net = peer_net;
641 list_add_tail(&lpni->lpni_on_peer_net_list, &peer_net->lpn_peer_nis);
642 list_add_tail(&peer_net->lpn_on_peer_list, &peer->lp_peer_nets);
644 lnet_net_unlock(LNET_LOCK_EX);
649 lnet_del_peer_ni_from_peer(lnet_nid_t key_nid, lnet_nid_t nid)
652 lnet_nid_t local_nid;
653 struct lnet_peer *peer;
654 struct lnet_peer_ni *lpni, *lpni2;
655 struct lnet_peer_table *ptable = NULL;
657 if (key_nid == LNET_NID_ANY)
660 local_nid = (nid != LNET_NID_ANY) ? nid : key_nid;
661 cpt = lnet_nid_cpt_hash(local_nid, LNET_CPT_NUMBER);
662 lnet_net_lock(LNET_LOCK_EX);
664 lpni = lnet_find_peer_ni_locked(local_nid);
666 lnet_net_unlock(cpt);
669 lnet_peer_ni_decref_locked(lpni);
671 peer = lpni->lpni_peer_net->lpn_peer;
672 LASSERT(peer != NULL);
674 if (peer->lp_primary_nid == lpni->lpni_nid) {
676 * deleting the primary ni is equivalent to deleting the
680 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
681 while (lpni != NULL) {
682 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
683 cpt = lnet_nid_cpt_hash(lpni->lpni_nid,
685 lnet_peer_remove_from_remote_list(lpni);
686 ptable = the_lnet.ln_peer_tables[cpt];
687 ptable->pt_zombies++;
688 list_del_init(&lpni->lpni_hashlist);
689 lnet_peer_ni_decref_locked(lpni);
692 lnet_net_unlock(LNET_LOCK_EX);
697 lnet_peer_remove_from_remote_list(lpni);
698 cpt = lnet_nid_cpt_hash(lpni->lpni_nid, LNET_CPT_NUMBER);
699 ptable = the_lnet.ln_peer_tables[cpt];
700 ptable->pt_zombies++;
701 list_del_init(&lpni->lpni_hashlist);
702 lnet_peer_ni_decref_locked(lpni);
703 lnet_net_unlock(LNET_LOCK_EX);
709 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
711 struct lnet_peer_table *ptable;
713 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
714 LASSERT(lpni->lpni_rtr_refcount == 0);
715 LASSERT(list_empty(&lpni->lpni_txq));
716 LASSERT(list_empty(&lpni->lpni_hashlist));
717 LASSERT(lpni->lpni_txqnob == 0);
718 LASSERT(lpni->lpni_peer_net != NULL);
719 LASSERT(lpni->lpni_peer_net->lpn_peer != NULL);
721 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
722 LASSERT(ptable->pt_number > 0);
725 lpni->lpni_net = NULL;
727 lnet_try_destroy_peer_hierarchy_locked(lpni);
729 LIBCFS_FREE(lpni, sizeof(*lpni));
731 LASSERT(ptable->pt_zombies > 0);
732 ptable->pt_zombies--;
736 lnet_nid2peerni_locked(struct lnet_peer_ni **lpnip, lnet_nid_t nid, int cpt)
738 struct lnet_peer_table *ptable;
739 struct lnet_peer_ni *lpni = NULL;
740 struct lnet_peer_ni *lpni2;
745 if (the_lnet.ln_shutdown) /* it's shutting down */
749 * calculate cpt2 with the standard hash function
750 * This cpt2 becomes the slot where we'll find or create the peer.
752 cpt2 = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
755 * Any changes to the peer tables happen under exclusive write
756 * lock. Any reads to the peer tables can be done via a standard
759 if (cpt != LNET_LOCK_EX) {
760 lnet_net_unlock(cpt);
761 lnet_net_lock(LNET_LOCK_EX);
764 ptable = the_lnet.ln_peer_tables[cpt2];
765 lpni = lnet_get_peer_ni_locked(ptable, nid);
768 if (cpt != LNET_LOCK_EX) {
769 lnet_net_unlock(LNET_LOCK_EX);
776 * take extra refcount in case another thread has shutdown LNet
777 * and destroyed locks and peer-table before I finish the allocation
780 lnet_net_unlock(LNET_LOCK_EX);
782 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt2, sizeof(*lpni));
790 INIT_LIST_HEAD(&lpni->lpni_txq);
791 INIT_LIST_HEAD(&lpni->lpni_rtrq);
792 INIT_LIST_HEAD(&lpni->lpni_routes);
793 INIT_LIST_HEAD(&lpni->lpni_hashlist);
794 INIT_LIST_HEAD(&lpni->lpni_on_peer_net_list);
795 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
797 lpni->lpni_alive = !lnet_peers_start_down(); /* 1 bit!! */
798 lpni->lpni_last_alive = cfs_time_current(); /* assumes alive */
799 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
800 lpni->lpni_nid = nid;
801 lpni->lpni_cpt = cpt2;
802 atomic_set(&lpni->lpni_refcount, 2); /* 1 for caller; 1 for hash */
804 rc = lnet_build_peer_hierarchy(lpni);
808 lnet_net_lock(LNET_LOCK_EX);
810 if (the_lnet.ln_shutdown) {
815 lpni2 = lnet_get_peer_ni_locked(ptable, nid);
821 lpni->lpni_net = lnet_get_net_locked(LNET_NIDNET(lpni->lpni_nid));
822 if (lpni->lpni_net) {
823 lpni->lpni_txcredits =
824 lpni->lpni_mintxcredits =
825 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
826 lpni->lpni_rtrcredits =
827 lpni->lpni_minrtrcredits =
828 lnet_peer_buffer_credits(lpni->lpni_net);
831 * if you're adding a peer which is not on a local network
832 * then we can't assign any of the credits. It won't be
833 * picked for sending anyway. Eventually a network can be
834 * added, in this case we need to revisit this peer and
835 * update its credits.
838 CDEBUG(D_NET, "peer_ni %s is not directly connected\n",
839 libcfs_nid2str(nid));
840 /* increment refcount for remote peer list */
841 atomic_inc(&lpni->lpni_refcount);
842 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
843 &the_lnet.ln_remote_peer_ni_list);
846 lnet_set_peer_ni_health_locked(lpni, true);
848 list_add_tail(&lpni->lpni_hashlist,
849 &ptable->pt_hash[lnet_nid2peerhash(nid)]);
850 ptable->pt_version++;
853 if (cpt != LNET_LOCK_EX) {
854 lnet_net_unlock(LNET_LOCK_EX);
861 lnet_try_destroy_peer_hierarchy_locked(lpni);
862 LIBCFS_FREE(lpni, sizeof(*lpni));
865 if (cpt != LNET_LOCK_EX) {
866 lnet_net_unlock(LNET_LOCK_EX);
873 lnet_debug_peer(lnet_nid_t nid)
875 char *aliveness = "NA";
876 struct lnet_peer_ni *lp;
880 cpt = lnet_cpt_of_nid(nid, NULL);
883 rc = lnet_nid2peerni_locked(&lp, nid, cpt);
885 lnet_net_unlock(cpt);
886 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
890 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
891 aliveness = lp->lpni_alive ? "up" : "down";
893 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
894 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
895 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
896 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
897 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
899 lnet_peer_ni_decref_locked(lp);
901 lnet_net_unlock(cpt);
904 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
905 char aliveness[LNET_MAX_STR_LEN],
906 __u32 *cpt_iter, __u32 *refcount,
907 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
908 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
911 struct lnet_peer_table *peer_table;
912 struct lnet_peer_ni *lp;
917 /* get the number of CPTs */
918 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
920 /* if the cpt number to be examined is >= the number of cpts in
921 * the system then indicate that there are no more cpts to examin
923 if (*cpt_iter >= lncpt)
926 /* get the current table */
927 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
928 /* if the ptable is NULL then there are no more cpts to examine */
929 if (peer_table == NULL)
932 lnet_net_lock(*cpt_iter);
934 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
935 struct list_head *peers = &peer_table->pt_hash[j];
937 list_for_each_entry(lp, peers, lpni_hashlist) {
938 if (peer_index-- > 0)
941 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
942 if (lnet_isrouter(lp) ||
943 lnet_peer_aliveness_enabled(lp))
944 snprintf(aliveness, LNET_MAX_STR_LEN,
945 lp->lpni_alive ? "up" : "down");
948 *refcount = atomic_read(&lp->lpni_refcount);
949 *ni_peer_tx_credits =
950 lp->lpni_net->net_tunables.lct_peer_tx_credits;
951 *peer_tx_credits = lp->lpni_txcredits;
952 *peer_rtr_credits = lp->lpni_rtrcredits;
953 *peer_min_rtr_credits = lp->lpni_mintxcredits;
954 *peer_tx_qnob = lp->lpni_txqnob;
960 lnet_net_unlock(*cpt_iter);
964 return found ? 0 : -ENOENT;
967 int lnet_get_peer_info(__u32 idx, lnet_nid_t *primary_nid, lnet_nid_t *nid,
968 struct lnet_peer_ni_credit_info *peer_ni_info,
969 struct lnet_ioctl_element_stats *peer_ni_stats)
971 struct lnet_peer_ni *lpni = NULL;
972 struct lnet_peer_net *lpn = NULL;
973 struct lnet_peer *lp = NULL;
975 lpni = lnet_get_peer_ni_idx_locked(idx, &lpn, &lp);
980 *primary_nid = lp->lp_primary_nid;
981 *nid = lpni->lpni_nid;
982 snprintf(peer_ni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
983 if (lnet_isrouter(lpni) ||
984 lnet_peer_aliveness_enabled(lpni))
985 snprintf(peer_ni_info->cr_aliveness, LNET_MAX_STR_LEN,
986 lpni->lpni_alive ? "up" : "down");
988 peer_ni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
989 peer_ni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
990 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
991 peer_ni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
992 peer_ni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
993 peer_ni_info->cr_peer_min_rtr_credits = lpni->lpni_mintxcredits;
994 peer_ni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
996 peer_ni_stats->send_count = atomic_read(&lpni->lpni_stats.send_count);
997 peer_ni_stats->recv_count = atomic_read(&lpni->lpni_stats.recv_count);
998 peer_ni_stats->drop_count = atomic_read(&lpni->lpni_stats.drop_count);