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 list_add_tail(&peer_net->lpn_on_peer_list, &peer->lp_peer_nets);
471 list_add_tail(&lpni->lpni_on_peer_net_list, &peer_net->lpn_peer_nis);
472 list_add_tail(&peer->lp_on_lnet_peer_list, &the_lnet.ln_peers);
477 struct lnet_peer_net *
478 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
480 struct lnet_peer_net *peer_net;
481 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_on_peer_list) {
482 if (peer_net->lpn_net_id == net_id)
489 * given the key nid find the peer to add the new peer NID to. If the key
490 * nid is NULL, then create a new peer, but first make sure that the NID
494 lnet_add_peer_ni_to_peer(lnet_nid_t key_nid, lnet_nid_t nid)
496 struct lnet_peer_ni *lpni, *lpni2;
497 struct lnet_peer *peer;
498 struct lnet_peer_net *peer_net, *pn;
500 struct lnet_peer_table *ptable = NULL;
501 __u32 net_id = LNET_NIDNET(nid);
503 if (nid == LNET_NID_ANY)
506 /* check that nid is unique */
507 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
509 lpni = lnet_find_peer_ni_locked(nid);
511 lnet_peer_ni_decref_locked(lpni);
512 lnet_net_unlock(cpt);
515 lnet_net_unlock(cpt);
517 if (key_nid != LNET_NID_ANY) {
518 cpt2 = lnet_nid_cpt_hash(key_nid, LNET_CPT_NUMBER);
520 lpni = lnet_find_peer_ni_locked(key_nid);
522 lnet_net_unlock(cpt2);
523 /* key_nid refers to a non-existant peer_ni.*/
526 peer = lpni->lpni_peer_net->lpn_peer;
527 peer->lp_multi_rail = true;
528 lnet_peer_ni_decref_locked(lpni);
529 lnet_net_unlock(cpt2);
531 lnet_net_lock(LNET_LOCK_EX);
532 rc = lnet_nid2peerni_locked(&lpni, nid, LNET_LOCK_EX);
534 lpni->lpni_peer_net->lpn_peer->lp_multi_rail = true;
535 lnet_peer_ni_decref_locked(lpni);
537 lnet_net_unlock(LNET_LOCK_EX);
543 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt, sizeof(*lpni));
547 INIT_LIST_HEAD(&lpni->lpni_txq);
548 INIT_LIST_HEAD(&lpni->lpni_rtrq);
549 INIT_LIST_HEAD(&lpni->lpni_routes);
550 INIT_LIST_HEAD(&lpni->lpni_hashlist);
551 INIT_LIST_HEAD(&lpni->lpni_on_peer_net_list);
552 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
554 lpni->lpni_alive = !lnet_peers_start_down(); /* 1 bit!! */
555 lpni->lpni_last_alive = cfs_time_current(); /* assumes alive */
556 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
557 lpni->lpni_nid = nid;
558 lpni->lpni_cpt = cpt;
559 lnet_set_peer_ni_health_locked(lpni, true);
561 /* allocate here in case we need to add a new peer_net */
563 LIBCFS_ALLOC(peer_net, sizeof(*peer_net));
564 if (peer_net == NULL) {
567 LIBCFS_FREE(lpni, sizeof(*lpni));
571 lnet_net_lock(LNET_LOCK_EX);
573 ptable = the_lnet.ln_peer_tables[cpt];
576 lpni2 = lnet_find_peer_ni_locked(nid);
578 lnet_peer_ni_decref_locked(lpni2);
579 /* sanity check that lpni2's peer is what we expect */
580 if (lpni2->lpni_peer_net->lpn_peer != peer)
586 /* another thread has already added it */
587 lnet_net_unlock(LNET_LOCK_EX);
588 LIBCFS_FREE(peer_net, sizeof(*peer_net));
592 lpni->lpni_net = lnet_get_net_locked(LNET_NIDNET(lpni->lpni_nid));
593 if (lpni->lpni_net != NULL) {
594 lpni->lpni_txcredits =
595 lpni->lpni_mintxcredits =
596 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
597 lpni->lpni_rtrcredits =
598 lpni->lpni_minrtrcredits = lnet_peer_buffer_credits(lpni->lpni_net);
601 * if you're adding a peer which is not on a local network
602 * then we can't assign any of the credits. It won't be
603 * picked for sending anyway. Eventually a network can be
604 * added, in this case we need to revisit this peer and
605 * update its credits.
608 /* increment refcount for remote peer list */
609 atomic_inc(&lpni->lpni_refcount);
610 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
611 &the_lnet.ln_remote_peer_ni_list);
614 /* increment refcount for peer on hash list */
615 atomic_inc(&lpni->lpni_refcount);
617 list_add_tail(&lpni->lpni_hashlist,
618 &ptable->pt_hash[lnet_nid2peerhash(nid)]);
619 ptable->pt_version++;
621 /* add the lpni to a net */
622 list_for_each_entry(pn, &peer->lp_peer_nets, lpn_on_peer_list) {
623 if (pn->lpn_net_id == net_id) {
624 list_add_tail(&lpni->lpni_on_peer_net_list,
626 lpni->lpni_peer_net = pn;
627 lnet_net_unlock(LNET_LOCK_EX);
628 LIBCFS_FREE(peer_net, sizeof(*peer_net));
633 INIT_LIST_HEAD(&peer_net->lpn_on_peer_list);
634 INIT_LIST_HEAD(&peer_net->lpn_peer_nis);
636 /* build the hierarchy */
637 peer_net->lpn_net_id = net_id;
638 peer_net->lpn_peer = peer;
639 lpni->lpni_peer_net = peer_net;
640 list_add_tail(&lpni->lpni_on_peer_net_list, &peer_net->lpn_peer_nis);
641 list_add_tail(&peer_net->lpn_on_peer_list, &peer->lp_peer_nets);
643 lnet_net_unlock(LNET_LOCK_EX);
648 lnet_del_peer_ni_from_peer(lnet_nid_t key_nid, lnet_nid_t nid)
651 lnet_nid_t local_nid;
652 struct lnet_peer *peer;
653 struct lnet_peer_ni *lpni, *lpni2;
654 struct lnet_peer_table *ptable = NULL;
656 if (key_nid == LNET_NID_ANY)
659 local_nid = (nid != LNET_NID_ANY) ? nid : key_nid;
660 cpt = lnet_nid_cpt_hash(local_nid, LNET_CPT_NUMBER);
661 lnet_net_lock(LNET_LOCK_EX);
663 lpni = lnet_find_peer_ni_locked(local_nid);
665 lnet_net_unlock(cpt);
668 lnet_peer_ni_decref_locked(lpni);
670 peer = lpni->lpni_peer_net->lpn_peer;
671 LASSERT(peer != NULL);
673 if (peer->lp_primary_nid == lpni->lpni_nid) {
675 * deleting the primary ni is equivalent to deleting the
679 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
680 while (lpni != NULL) {
681 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
682 cpt = lnet_nid_cpt_hash(lpni->lpni_nid,
684 lnet_peer_remove_from_remote_list(lpni);
685 ptable = the_lnet.ln_peer_tables[cpt];
686 ptable->pt_zombies++;
687 list_del_init(&lpni->lpni_hashlist);
688 lnet_peer_ni_decref_locked(lpni);
691 lnet_net_unlock(LNET_LOCK_EX);
696 lnet_peer_remove_from_remote_list(lpni);
697 cpt = lnet_nid_cpt_hash(lpni->lpni_nid, LNET_CPT_NUMBER);
698 ptable = the_lnet.ln_peer_tables[cpt];
699 ptable->pt_zombies++;
700 list_del_init(&lpni->lpni_hashlist);
701 lnet_peer_ni_decref_locked(lpni);
702 lnet_net_unlock(LNET_LOCK_EX);
708 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
710 struct lnet_peer_table *ptable;
712 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
713 LASSERT(lpni->lpni_rtr_refcount == 0);
714 LASSERT(list_empty(&lpni->lpni_txq));
715 LASSERT(list_empty(&lpni->lpni_hashlist));
716 LASSERT(lpni->lpni_txqnob == 0);
717 LASSERT(lpni->lpni_peer_net != NULL);
718 LASSERT(lpni->lpni_peer_net->lpn_peer != NULL);
720 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
721 LASSERT(ptable->pt_number > 0);
724 lpni->lpni_net = NULL;
726 lnet_try_destroy_peer_hierarchy_locked(lpni);
728 LIBCFS_FREE(lpni, sizeof(*lpni));
730 LASSERT(ptable->pt_zombies > 0);
731 ptable->pt_zombies--;
735 lnet_nid2peerni_locked(struct lnet_peer_ni **lpnip, lnet_nid_t nid, int cpt)
737 struct lnet_peer_table *ptable;
738 struct lnet_peer_ni *lpni = NULL;
739 struct lnet_peer_ni *lpni2;
744 if (the_lnet.ln_shutdown) /* it's shutting down */
748 * calculate cpt2 with the standard hash function
749 * This cpt2 becomes the slot where we'll find or create the peer.
751 cpt2 = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
754 * Any changes to the peer tables happen under exclusive write
755 * lock. Any reads to the peer tables can be done via a standard
758 if (cpt != LNET_LOCK_EX) {
759 lnet_net_unlock(cpt);
760 lnet_net_lock(LNET_LOCK_EX);
763 ptable = the_lnet.ln_peer_tables[cpt2];
764 lpni = lnet_get_peer_ni_locked(ptable, nid);
767 if (cpt != LNET_LOCK_EX) {
768 lnet_net_unlock(LNET_LOCK_EX);
775 * take extra refcount in case another thread has shutdown LNet
776 * and destroyed locks and peer-table before I finish the allocation
779 lnet_net_unlock(LNET_LOCK_EX);
781 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt2, sizeof(*lpni));
789 INIT_LIST_HEAD(&lpni->lpni_txq);
790 INIT_LIST_HEAD(&lpni->lpni_rtrq);
791 INIT_LIST_HEAD(&lpni->lpni_routes);
792 INIT_LIST_HEAD(&lpni->lpni_hashlist);
793 INIT_LIST_HEAD(&lpni->lpni_on_peer_net_list);
794 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
796 lpni->lpni_alive = !lnet_peers_start_down(); /* 1 bit!! */
797 lpni->lpni_last_alive = cfs_time_current(); /* assumes alive */
798 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
799 lpni->lpni_nid = nid;
800 lpni->lpni_cpt = cpt2;
801 atomic_set(&lpni->lpni_refcount, 2); /* 1 for caller; 1 for hash */
803 rc = lnet_build_peer_hierarchy(lpni);
807 lnet_net_lock(LNET_LOCK_EX);
809 if (the_lnet.ln_shutdown) {
814 lpni2 = lnet_get_peer_ni_locked(ptable, nid);
820 lpni->lpni_net = lnet_get_net_locked(LNET_NIDNET(lpni->lpni_nid));
821 if (lpni->lpni_net) {
822 lpni->lpni_txcredits =
823 lpni->lpni_mintxcredits =
824 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
825 lpni->lpni_rtrcredits =
826 lpni->lpni_minrtrcredits =
827 lnet_peer_buffer_credits(lpni->lpni_net);
830 * if you're adding a peer which is not on a local network
831 * then we can't assign any of the credits. It won't be
832 * picked for sending anyway. Eventually a network can be
833 * added, in this case we need to revisit this peer and
834 * update its credits.
837 CDEBUG(D_NET, "peer_ni %s is not directly connected\n",
838 libcfs_nid2str(nid));
839 /* increment refcount for remote peer list */
840 atomic_inc(&lpni->lpni_refcount);
841 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
842 &the_lnet.ln_remote_peer_ni_list);
845 lnet_set_peer_ni_health_locked(lpni, true);
847 list_add_tail(&lpni->lpni_hashlist,
848 &ptable->pt_hash[lnet_nid2peerhash(nid)]);
849 ptable->pt_version++;
852 if (cpt != LNET_LOCK_EX) {
853 lnet_net_unlock(LNET_LOCK_EX);
860 lnet_try_destroy_peer_hierarchy_locked(lpni);
861 LIBCFS_FREE(lpni, sizeof(*lpni));
864 if (cpt != LNET_LOCK_EX) {
865 lnet_net_unlock(LNET_LOCK_EX);
872 lnet_debug_peer(lnet_nid_t nid)
874 char *aliveness = "NA";
875 struct lnet_peer_ni *lp;
879 cpt = lnet_cpt_of_nid(nid, NULL);
882 rc = lnet_nid2peerni_locked(&lp, nid, cpt);
884 lnet_net_unlock(cpt);
885 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
889 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
890 aliveness = lp->lpni_alive ? "up" : "down";
892 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
893 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
894 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
895 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
896 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
898 lnet_peer_ni_decref_locked(lp);
900 lnet_net_unlock(cpt);
903 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
904 char aliveness[LNET_MAX_STR_LEN],
905 __u32 *cpt_iter, __u32 *refcount,
906 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
907 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
910 struct lnet_peer_table *peer_table;
911 struct lnet_peer_ni *lp;
916 /* get the number of CPTs */
917 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
919 /* if the cpt number to be examined is >= the number of cpts in
920 * the system then indicate that there are no more cpts to examin
922 if (*cpt_iter >= lncpt)
925 /* get the current table */
926 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
927 /* if the ptable is NULL then there are no more cpts to examine */
928 if (peer_table == NULL)
931 lnet_net_lock(*cpt_iter);
933 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
934 struct list_head *peers = &peer_table->pt_hash[j];
936 list_for_each_entry(lp, peers, lpni_hashlist) {
937 if (peer_index-- > 0)
940 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
941 if (lnet_isrouter(lp) ||
942 lnet_peer_aliveness_enabled(lp))
943 snprintf(aliveness, LNET_MAX_STR_LEN,
944 lp->lpni_alive ? "up" : "down");
947 *refcount = atomic_read(&lp->lpni_refcount);
948 *ni_peer_tx_credits =
949 lp->lpni_net->net_tunables.lct_peer_tx_credits;
950 *peer_tx_credits = lp->lpni_txcredits;
951 *peer_rtr_credits = lp->lpni_rtrcredits;
952 *peer_min_rtr_credits = lp->lpni_mintxcredits;
953 *peer_tx_qnob = lp->lpni_txqnob;
959 lnet_net_unlock(*cpt_iter);
963 return found ? 0 : -ENOENT;
966 int lnet_get_peer_info(__u32 idx, lnet_nid_t *primary_nid, lnet_nid_t *nid,
967 struct lnet_peer_ni_credit_info *peer_ni_info)
969 struct lnet_peer_ni *lpni = NULL;
970 struct lnet_peer_net *lpn = NULL;
971 struct lnet_peer *lp = NULL;
973 lpni = lnet_get_peer_ni_idx_locked(idx, &lpn, &lp);
978 *primary_nid = lp->lp_primary_nid;
979 *nid = lpni->lpni_nid;
980 snprintf(peer_ni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
981 if (lnet_isrouter(lpni) ||
982 lnet_peer_aliveness_enabled(lpni))
983 snprintf(peer_ni_info->cr_aliveness, LNET_MAX_STR_LEN,
984 lpni->lpni_alive ? "up" : "down");
986 peer_ni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
987 peer_ni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
988 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
989 peer_ni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
990 peer_ni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
991 peer_ni_info->cr_peer_min_rtr_credits = lpni->lpni_mintxcredits;
992 peer_ni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;