4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
35 #define DEBUG_SUBSYSTEM S_LNET
37 #include <linux/sched.h>
38 #ifdef HAVE_SCHED_HEADERS
39 #include <linux/sched/signal.h>
41 #include <linux/uaccess.h>
43 #include <lnet/lib-lnet.h>
44 #include <uapi/linux/lnet/lnet-dlc.h>
46 /* Value indicating that recovery needs to re-check a peer immediately. */
47 #define LNET_REDISCOVER_PEER (1)
49 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp);
52 lnet_peer_remove_from_remote_list(struct lnet_peer_ni *lpni)
54 if (!list_empty(&lpni->lpni_on_remote_peer_ni_list)) {
55 list_del_init(&lpni->lpni_on_remote_peer_ni_list);
56 lnet_peer_ni_decref_locked(lpni);
61 lnet_peer_net_added(struct lnet_net *net)
63 struct lnet_peer_ni *lpni, *tmp;
65 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
66 lpni_on_remote_peer_ni_list) {
68 if (LNET_NIDNET(lpni->lpni_nid) == net->net_id) {
71 spin_lock(&lpni->lpni_lock);
72 lpni->lpni_txcredits =
73 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
74 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
75 lpni->lpni_rtrcredits =
76 lnet_peer_buffer_credits(lpni->lpni_net);
77 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
78 spin_unlock(&lpni->lpni_lock);
80 lnet_peer_remove_from_remote_list(lpni);
86 lnet_peer_tables_destroy(void)
88 struct lnet_peer_table *ptable;
89 struct list_head *hash;
93 if (!the_lnet.ln_peer_tables)
96 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
97 hash = ptable->pt_hash;
98 if (!hash) /* not intialized */
101 LASSERT(list_empty(&ptable->pt_zombie_list));
103 ptable->pt_hash = NULL;
104 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
105 LASSERT(list_empty(&hash[j]));
107 CFS_FREE_PTR_ARRAY(hash, LNET_PEER_HASH_SIZE);
110 cfs_percpt_free(the_lnet.ln_peer_tables);
111 the_lnet.ln_peer_tables = NULL;
115 lnet_peer_tables_create(void)
117 struct lnet_peer_table *ptable;
118 struct list_head *hash;
122 the_lnet.ln_peer_tables = cfs_percpt_alloc(lnet_cpt_table(),
124 if (the_lnet.ln_peer_tables == NULL) {
125 CERROR("Failed to allocate cpu-partition peer tables\n");
129 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
130 LIBCFS_CPT_ALLOC(hash, lnet_cpt_table(), i,
131 LNET_PEER_HASH_SIZE * sizeof(*hash));
133 CERROR("Failed to create peer hash table\n");
134 lnet_peer_tables_destroy();
138 spin_lock_init(&ptable->pt_zombie_lock);
139 INIT_LIST_HEAD(&ptable->pt_zombie_list);
141 INIT_LIST_HEAD(&ptable->pt_peer_list);
143 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
144 INIT_LIST_HEAD(&hash[j]);
145 ptable->pt_hash = hash; /* sign of initialization */
151 static struct lnet_peer_ni *
152 lnet_peer_ni_alloc(lnet_nid_t nid)
154 struct lnet_peer_ni *lpni;
155 struct lnet_net *net;
158 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
160 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt, sizeof(*lpni));
164 INIT_LIST_HEAD(&lpni->lpni_txq);
165 INIT_LIST_HEAD(&lpni->lpni_hashlist);
166 INIT_LIST_HEAD(&lpni->lpni_peer_nis);
167 INIT_LIST_HEAD(&lpni->lpni_recovery);
168 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
169 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
171 spin_lock_init(&lpni->lpni_lock);
173 if (lnet_peers_start_down())
174 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
176 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
177 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
178 lpni->lpni_nid = nid;
179 lpni->lpni_cpt = cpt;
180 atomic_set(&lpni->lpni_healthv, LNET_MAX_HEALTH_VALUE);
182 net = lnet_get_net_locked(LNET_NIDNET(nid));
183 lpni->lpni_net = net;
185 lpni->lpni_txcredits = net->net_tunables.lct_peer_tx_credits;
186 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
187 lpni->lpni_rtrcredits = lnet_peer_buffer_credits(net);
188 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
191 * This peer_ni is not on a local network, so we
192 * cannot add the credits here. In case the net is
193 * added later, add the peer_ni to the remote peer ni
194 * list so it can be easily found and revisited.
196 /* FIXME: per-net implementation instead? */
197 atomic_inc(&lpni->lpni_refcount);
198 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
199 &the_lnet.ln_remote_peer_ni_list);
202 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
207 static struct lnet_peer_net *
208 lnet_peer_net_alloc(__u32 net_id)
210 struct lnet_peer_net *lpn;
212 LIBCFS_CPT_ALLOC(lpn, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lpn));
216 INIT_LIST_HEAD(&lpn->lpn_peer_nets);
217 INIT_LIST_HEAD(&lpn->lpn_peer_nis);
218 lpn->lpn_net_id = net_id;
220 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
226 lnet_destroy_peer_net_locked(struct lnet_peer_net *lpn)
228 struct lnet_peer *lp;
230 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
232 LASSERT(atomic_read(&lpn->lpn_refcount) == 0);
233 LASSERT(list_empty(&lpn->lpn_peer_nis));
234 LASSERT(list_empty(&lpn->lpn_peer_nets));
236 lpn->lpn_peer = NULL;
237 LIBCFS_FREE(lpn, sizeof(*lpn));
239 lnet_peer_decref_locked(lp);
242 static struct lnet_peer *
243 lnet_peer_alloc(lnet_nid_t nid)
245 struct lnet_peer *lp;
247 LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lp));
251 INIT_LIST_HEAD(&lp->lp_rtrq);
252 INIT_LIST_HEAD(&lp->lp_routes);
253 INIT_LIST_HEAD(&lp->lp_peer_list);
254 INIT_LIST_HEAD(&lp->lp_peer_nets);
255 INIT_LIST_HEAD(&lp->lp_dc_list);
256 INIT_LIST_HEAD(&lp->lp_dc_pendq);
257 INIT_LIST_HEAD(&lp->lp_rtr_list);
258 init_waitqueue_head(&lp->lp_dc_waitq);
259 spin_lock_init(&lp->lp_lock);
260 lp->lp_primary_nid = nid;
261 lp->lp_disc_src_nid = LNET_NID_ANY;
262 if (lnet_peers_start_down())
263 lp->lp_alive = false;
268 * all peers created on a router should have health on
269 * if it's not already on.
271 if (the_lnet.ln_routing && !lnet_health_sensitivity)
272 lp->lp_health_sensitivity = 1;
275 * Turn off discovery for loopback peer. If you're creating a peer
276 * for the loopback interface then that was initiated when we
277 * attempted to send a message over the loopback. There is no need
278 * to ever use a different interface when sending messages to
281 if (nid == LNET_NID_LO_0)
282 lp->lp_state = LNET_PEER_NO_DISCOVERY;
283 lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
285 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
291 lnet_destroy_peer_locked(struct lnet_peer *lp)
293 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
295 LASSERT(atomic_read(&lp->lp_refcount) == 0);
296 LASSERT(lp->lp_rtr_refcount == 0);
297 LASSERT(list_empty(&lp->lp_peer_nets));
298 LASSERT(list_empty(&lp->lp_peer_list));
299 LASSERT(list_empty(&lp->lp_dc_list));
302 lnet_ping_buffer_decref(lp->lp_data);
305 * if there are messages still on the pending queue, then make
306 * sure to queue them on the ln_msg_resend list so they can be
307 * resent at a later point if the discovery thread is still
309 * If the discovery thread has stopped, then the wakeup will be a
310 * no-op, and it is expected the lnet_shutdown_lndnets() will
311 * eventually be called, which will traverse this list and
312 * finalize the messages on the list.
313 * We can not resend them now because we're holding the cpt lock.
314 * Releasing the lock can cause an inconsistent state
316 spin_lock(&the_lnet.ln_msg_resend_lock);
317 spin_lock(&lp->lp_lock);
318 list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
319 spin_unlock(&lp->lp_lock);
320 spin_unlock(&the_lnet.ln_msg_resend_lock);
321 wake_up(&the_lnet.ln_dc_waitq);
323 LIBCFS_FREE(lp, sizeof(*lp));
327 * Detach a peer_ni from its peer_net. If this was the last peer_ni on
328 * that peer_net, detach the peer_net from the peer.
330 * Call with lnet_net_lock/EX held
333 lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
335 struct lnet_peer_table *ptable;
336 struct lnet_peer_net *lpn;
337 struct lnet_peer *lp;
340 * Belts and suspenders: gracefully handle teardown of a
341 * partially connected peer_ni.
343 lpn = lpni->lpni_peer_net;
345 list_del_init(&lpni->lpni_peer_nis);
347 * If there are no lpni's left, we detach lpn from
348 * lp_peer_nets, so it cannot be found anymore.
350 if (list_empty(&lpn->lpn_peer_nis))
351 list_del_init(&lpn->lpn_peer_nets);
353 /* Update peer NID count. */
358 * If there are no more peer nets, make the peer unfindable
359 * via the peer_tables.
361 * Otherwise, if the peer is DISCOVERED, tell discovery to
362 * take another look at it. This is a no-op if discovery for
363 * this peer did the detaching.
365 if (list_empty(&lp->lp_peer_nets)) {
366 list_del_init(&lp->lp_peer_list);
367 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
369 } else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
370 /* Discovery isn't running, nothing to do here. */
371 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
372 lnet_peer_queue_for_discovery(lp);
373 wake_up(&the_lnet.ln_dc_waitq);
375 CDEBUG(D_NET, "peer %s NID %s\n",
376 libcfs_nid2str(lp->lp_primary_nid),
377 libcfs_nid2str(lpni->lpni_nid));
380 /* called with lnet_net_lock LNET_LOCK_EX held */
382 lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni, bool force)
384 struct lnet_peer_table *ptable = NULL;
386 /* don't remove a peer_ni if it's also a gateway */
387 if (lnet_isrouter(lpni) && !force) {
388 CERROR("Peer NI %s is a gateway. Can not delete it\n",
389 libcfs_nid2str(lpni->lpni_nid));
393 lnet_peer_remove_from_remote_list(lpni);
395 /* remove peer ni from the hash list. */
396 list_del_init(&lpni->lpni_hashlist);
399 * indicate the peer is being deleted so the monitor thread can
400 * remove it from the recovery queue.
402 spin_lock(&lpni->lpni_lock);
403 lpni->lpni_state |= LNET_PEER_NI_DELETING;
404 spin_unlock(&lpni->lpni_lock);
406 /* decrement the ref count on the peer table */
407 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
410 * The peer_ni can no longer be found with a lookup. But there
411 * can be current users, so keep track of it on the zombie
412 * list until the reference count has gone to zero.
414 * The last reference may be lost in a place where the
415 * lnet_net_lock locks only a single cpt, and that cpt may not
416 * be lpni->lpni_cpt. So the zombie list of lnet_peer_table
419 spin_lock(&ptable->pt_zombie_lock);
420 list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
421 ptable->pt_zombies++;
422 spin_unlock(&ptable->pt_zombie_lock);
424 /* no need to keep this peer_ni on the hierarchy anymore */
425 lnet_peer_detach_peer_ni_locked(lpni);
427 /* remove hashlist reference on peer_ni */
428 lnet_peer_ni_decref_locked(lpni);
433 void lnet_peer_uninit(void)
435 struct lnet_peer_ni *lpni, *tmp;
437 lnet_net_lock(LNET_LOCK_EX);
439 /* remove all peer_nis from the remote peer and the hash list */
440 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
441 lpni_on_remote_peer_ni_list)
442 lnet_peer_ni_del_locked(lpni, false);
444 lnet_peer_tables_destroy();
446 lnet_net_unlock(LNET_LOCK_EX);
450 lnet_peer_del_locked(struct lnet_peer *peer)
452 struct lnet_peer_ni *lpni = NULL, *lpni2;
455 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(peer->lp_primary_nid));
457 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
458 while (lpni != NULL) {
459 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
460 rc = lnet_peer_ni_del_locked(lpni, false);
470 lnet_peer_del(struct lnet_peer *peer)
472 lnet_net_lock(LNET_LOCK_EX);
473 lnet_peer_del_locked(peer);
474 lnet_net_unlock(LNET_LOCK_EX);
480 * Delete a NID from a peer. Call with ln_api_mutex held.
483 * -EPERM: Non-DLC deletion from DLC-configured peer.
484 * -ENOENT: No lnet_peer_ni corresponding to the nid.
485 * -ECHILD: The lnet_peer_ni isn't connected to the peer.
486 * -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
489 lnet_peer_del_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
491 struct lnet_peer_ni *lpni;
492 lnet_nid_t primary_nid = lp->lp_primary_nid;
494 bool force = (flags & LNET_PEER_RTR_NI_FORCE_DEL) ? true : false;
496 if (!(flags & LNET_PEER_CONFIGURED)) {
497 if (lp->lp_state & LNET_PEER_CONFIGURED) {
502 lpni = lnet_find_peer_ni_locked(nid);
507 lnet_peer_ni_decref_locked(lpni);
508 if (lp != lpni->lpni_peer_net->lpn_peer) {
514 * This function only allows deletion of the primary NID if it
517 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && !force) {
522 lnet_net_lock(LNET_LOCK_EX);
524 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && force) {
525 struct lnet_peer_ni *lpni2;
526 /* assign the next peer_ni to be the primary */
527 lpni2 = lnet_get_next_peer_ni_locked(lp, NULL, lpni);
529 lp->lp_primary_nid = lpni2->lpni_nid;
531 rc = lnet_peer_ni_del_locked(lpni, force);
533 lnet_net_unlock(LNET_LOCK_EX);
536 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
537 libcfs_nid2str(primary_nid), libcfs_nid2str(nid), flags, rc);
543 lnet_peer_table_cleanup_locked(struct lnet_net *net,
544 struct lnet_peer_table *ptable)
547 struct lnet_peer_ni *next;
548 struct lnet_peer_ni *lpni;
549 struct lnet_peer *peer;
551 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
552 list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
554 if (net != NULL && net != lpni->lpni_net)
557 peer = lpni->lpni_peer_net->lpn_peer;
558 if (peer->lp_primary_nid != lpni->lpni_nid) {
559 lnet_peer_ni_del_locked(lpni, false);
563 * Removing the primary NID implies removing
564 * the entire peer. Advance next beyond any
565 * peer_ni that belongs to the same peer.
567 list_for_each_entry_from(next, &ptable->pt_hash[i],
569 if (next->lpni_peer_net->lpn_peer != peer)
572 lnet_peer_del_locked(peer);
578 lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
580 wait_var_event_warning(&ptable->pt_zombies,
581 ptable->pt_zombies == 0,
582 "Waiting for %d zombies on peer table\n",
587 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
588 struct lnet_peer_table *ptable)
590 struct lnet_peer_ni *lp;
591 struct lnet_peer_ni *tmp;
595 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
596 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
598 if (net != lp->lpni_net)
601 if (!lnet_isrouter(lp))
604 gw_nid = lp->lpni_peer_net->lpn_peer->lp_primary_nid;
606 lnet_net_unlock(LNET_LOCK_EX);
607 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), gw_nid);
608 lnet_net_lock(LNET_LOCK_EX);
614 lnet_peer_tables_cleanup(struct lnet_net *net)
617 struct lnet_peer_table *ptable;
619 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
620 /* If just deleting the peers for a NI, get rid of any routes these
621 * peers are gateways for. */
622 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
623 lnet_net_lock(LNET_LOCK_EX);
624 lnet_peer_table_del_rtrs_locked(net, ptable);
625 lnet_net_unlock(LNET_LOCK_EX);
628 /* Start the cleanup process */
629 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
630 lnet_net_lock(LNET_LOCK_EX);
631 lnet_peer_table_cleanup_locked(net, ptable);
632 lnet_net_unlock(LNET_LOCK_EX);
635 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
636 lnet_peer_ni_finalize_wait(ptable);
639 static struct lnet_peer_ni *
640 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
642 struct list_head *peers;
643 struct lnet_peer_ni *lp;
645 if (the_lnet.ln_state != LNET_STATE_RUNNING)
648 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
649 list_for_each_entry(lp, peers, lpni_hashlist) {
650 if (lp->lpni_nid == nid) {
651 lnet_peer_ni_addref_locked(lp);
659 struct lnet_peer_ni *
660 lnet_find_peer_ni_locked(lnet_nid_t nid)
662 struct lnet_peer_ni *lpni;
663 struct lnet_peer_table *ptable;
666 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
668 ptable = the_lnet.ln_peer_tables[cpt];
669 lpni = lnet_get_peer_ni_locked(ptable, nid);
674 struct lnet_peer_ni *
675 lnet_peer_get_ni_locked(struct lnet_peer *lp, lnet_nid_t nid)
677 struct lnet_peer_net *lpn;
678 struct lnet_peer_ni *lpni;
680 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
684 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
685 if (lpni->lpni_nid == nid)
693 lnet_find_peer(lnet_nid_t nid)
695 struct lnet_peer_ni *lpni;
696 struct lnet_peer *lp = NULL;
699 cpt = lnet_net_lock_current();
700 lpni = lnet_find_peer_ni_locked(nid);
702 lp = lpni->lpni_peer_net->lpn_peer;
703 lnet_peer_addref_locked(lp);
704 lnet_peer_ni_decref_locked(lpni);
706 lnet_net_unlock(cpt);
711 struct lnet_peer_net *
712 lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
714 struct lnet_peer_net *net;
717 /* no net id provided return the first net */
718 net = list_first_entry_or_null(&lp->lp_peer_nets,
719 struct lnet_peer_net,
725 /* find the net after the one provided */
726 list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
727 if (net->lpn_net_id == prev_lpn_id) {
729 * if we reached the end of the list loop to the
732 if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
733 return list_first_entry_or_null(&lp->lp_peer_nets,
734 struct lnet_peer_net,
737 return list_next_entry(net, lpn_peer_nets);
744 struct lnet_peer_ni *
745 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
746 struct lnet_peer_net *peer_net,
747 struct lnet_peer_ni *prev)
749 struct lnet_peer_ni *lpni;
750 struct lnet_peer_net *net = peer_net;
754 if (list_empty(&peer->lp_peer_nets))
757 net = list_entry(peer->lp_peer_nets.next,
758 struct lnet_peer_net,
761 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
767 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
769 * if you reached the end of the peer ni list and the peer
770 * net is specified then there are no more peer nis in that
777 * we reached the end of this net ni list. move to the
780 if (prev->lpni_peer_net->lpn_peer_nets.next ==
782 /* no more nets and no more NIs. */
785 /* get the next net */
786 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
787 struct lnet_peer_net,
789 /* get the ni on it */
790 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
796 /* there are more nis left */
797 lpni = list_entry(prev->lpni_peer_nis.next,
798 struct lnet_peer_ni, lpni_peer_nis);
803 /* Call with the ln_api_mutex held */
804 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
806 struct lnet_process_id id;
807 struct lnet_peer_table *ptable;
808 struct lnet_peer *lp;
817 if (the_lnet.ln_state != LNET_STATE_RUNNING)
820 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
823 * Count the number of peers, and return E2BIG if the buffer
824 * is too small. We'll also return the desired size.
827 for (cpt = 0; cpt < lncpt; cpt++) {
828 ptable = the_lnet.ln_peer_tables[cpt];
829 count += ptable->pt_peers;
831 size = count * sizeof(*ids);
836 * Walk the peer lists and copy out the primary nids.
837 * This is safe because the peer lists are only modified
838 * while the ln_api_mutex is held. So we don't need to
839 * hold the lnet_net_lock as well, and can therefore
840 * directly call copy_to_user().
843 memset(&id, 0, sizeof(id));
844 id.pid = LNET_PID_LUSTRE;
846 for (cpt = 0; cpt < lncpt; cpt++) {
847 ptable = the_lnet.ln_peer_tables[cpt];
848 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
851 id.nid = lp->lp_primary_nid;
852 if (copy_to_user(&ids[i], &id, sizeof(id)))
865 * Start pushes to peers that need to be updated for a configuration
866 * change on this node.
869 lnet_push_update_to_peers(int force)
871 struct lnet_peer_table *ptable;
872 struct lnet_peer *lp;
876 lnet_net_lock(LNET_LOCK_EX);
877 if (lnet_peer_discovery_disabled)
879 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
880 for (cpt = 0; cpt < lncpt; cpt++) {
881 ptable = the_lnet.ln_peer_tables[cpt];
882 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
884 spin_lock(&lp->lp_lock);
885 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
886 lp->lp_state |= LNET_PEER_FORCE_PUSH;
887 spin_unlock(&lp->lp_lock);
889 if (lnet_peer_needs_push(lp))
890 lnet_peer_queue_for_discovery(lp);
893 lnet_net_unlock(LNET_LOCK_EX);
894 wake_up(&the_lnet.ln_dc_waitq);
898 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
899 * this is a preferred point-to-point path. Call with lnet_net_lock in
903 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
907 if (lpni->lpni_pref_nnids == 0)
909 if (lpni->lpni_pref_nnids == 1)
910 return lpni->lpni_pref.nid == nid;
911 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
912 if (lpni->lpni_pref.nids[i] == nid)
919 * Set a single ni as preferred, provided no preferred ni is already
920 * defined. Only to be used for non-multi-rail peer_ni.
923 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
927 spin_lock(&lpni->lpni_lock);
928 if (nid == LNET_NID_ANY) {
930 } else if (lpni->lpni_pref_nnids > 0) {
932 } else if (lpni->lpni_pref_nnids == 0) {
933 lpni->lpni_pref.nid = nid;
934 lpni->lpni_pref_nnids = 1;
935 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
937 spin_unlock(&lpni->lpni_lock);
939 CDEBUG(D_NET, "peer %s nid %s: %d\n",
940 libcfs_nid2str(lpni->lpni_nid), libcfs_nid2str(nid), rc);
945 * Clear the preferred NID from a non-multi-rail peer_ni, provided
946 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
949 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
953 spin_lock(&lpni->lpni_lock);
954 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
955 lpni->lpni_pref_nnids = 0;
956 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
957 } else if (lpni->lpni_pref_nnids == 0) {
962 spin_unlock(&lpni->lpni_lock);
964 CDEBUG(D_NET, "peer %s: %d\n",
965 libcfs_nid2str(lpni->lpni_nid), rc);
970 * Clear the preferred NIDs from a non-multi-rail peer.
973 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
975 struct lnet_peer_ni *lpni = NULL;
977 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
978 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
982 lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
984 lnet_nid_t *nids = NULL;
985 lnet_nid_t *oldnids = NULL;
986 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
991 if (nid == LNET_NID_ANY) {
996 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
1001 /* A non-MR node may have only one preferred NI per peer_ni */
1002 if (lpni->lpni_pref_nnids > 0) {
1003 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1009 if (lpni->lpni_pref_nnids != 0) {
1010 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1011 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1016 for (i = 0; i < lpni->lpni_pref_nnids; i++) {
1017 if (lpni->lpni_pref.nids[i] == nid) {
1018 LIBCFS_FREE(nids, size);
1022 nids[i] = lpni->lpni_pref.nids[i];
1027 lnet_net_lock(LNET_LOCK_EX);
1028 spin_lock(&lpni->lpni_lock);
1029 if (lpni->lpni_pref_nnids == 0) {
1030 lpni->lpni_pref.nid = nid;
1032 oldnids = lpni->lpni_pref.nids;
1033 lpni->lpni_pref.nids = nids;
1035 lpni->lpni_pref_nnids++;
1036 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1037 spin_unlock(&lpni->lpni_lock);
1038 lnet_net_unlock(LNET_LOCK_EX);
1041 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1042 CFS_FREE_PTR_ARRAY(oldnids, size);
1045 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
1046 spin_lock(&lpni->lpni_lock);
1047 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1048 spin_unlock(&lpni->lpni_lock);
1050 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1051 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1056 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1058 lnet_nid_t *nids = NULL;
1059 lnet_nid_t *oldnids = NULL;
1060 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1065 if (lpni->lpni_pref_nnids == 0) {
1070 if (lpni->lpni_pref_nnids == 1) {
1071 if (lpni->lpni_pref.nid != nid) {
1075 } else if (lpni->lpni_pref_nnids == 2) {
1076 if (lpni->lpni_pref.nids[0] != nid &&
1077 lpni->lpni_pref.nids[1] != nid) {
1082 size = sizeof(*nids) * (lpni->lpni_pref_nnids - 1);
1083 LIBCFS_CPT_ALLOC(nids, lnet_cpt_table(), lpni->lpni_cpt, size);
1088 for (i = 0, j = 0; i < lpni->lpni_pref_nnids; i++) {
1089 if (lpni->lpni_pref.nids[i] != nid)
1091 nids[j++] = lpni->lpni_pref.nids[i];
1093 /* Check if we actually removed a nid. */
1094 if (j == lpni->lpni_pref_nnids) {
1095 LIBCFS_FREE(nids, size);
1101 lnet_net_lock(LNET_LOCK_EX);
1102 spin_lock(&lpni->lpni_lock);
1103 if (lpni->lpni_pref_nnids == 1) {
1104 lpni->lpni_pref.nid = LNET_NID_ANY;
1105 } else if (lpni->lpni_pref_nnids == 2) {
1106 oldnids = lpni->lpni_pref.nids;
1107 if (oldnids[0] == nid)
1108 lpni->lpni_pref.nid = oldnids[1];
1110 lpni->lpni_pref.nid = oldnids[2];
1112 oldnids = lpni->lpni_pref.nids;
1113 lpni->lpni_pref.nids = nids;
1115 lpni->lpni_pref_nnids--;
1116 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1117 spin_unlock(&lpni->lpni_lock);
1118 lnet_net_unlock(LNET_LOCK_EX);
1121 size = sizeof(*nids) * (lpni->lpni_pref_nnids + 1);
1122 CFS_FREE_PTR_ARRAY(oldnids, size);
1125 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1126 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1131 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1133 struct lnet_peer_ni *lpni;
1134 lnet_nid_t primary_nid = nid;
1136 lpni = lnet_find_peer_ni_locked(nid);
1138 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
1139 lnet_peer_ni_decref_locked(lpni);
1146 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1147 __must_hold(&lp->lp_lock)
1149 if (lnet_peer_discovery_disabled)
1152 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1153 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1164 lnet_is_discovery_disabled(struct lnet_peer *lp)
1168 spin_lock(&lp->lp_lock);
1169 rc = lnet_is_discovery_disabled_locked(lp);
1170 spin_unlock(&lp->lp_lock);
1176 LNetPrimaryNID(lnet_nid_t nid)
1178 struct lnet_peer *lp;
1179 struct lnet_peer_ni *lpni;
1180 lnet_nid_t primary_nid = nid;
1184 if (nid == LNET_NID_LO_0)
1185 return LNET_NID_LO_0;
1187 cpt = lnet_net_lock_current();
1188 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1193 lp = lpni->lpni_peer_net->lpn_peer;
1195 while (!lnet_peer_is_uptodate(lp)) {
1196 rc = lnet_discover_peer_locked(lpni, cpt, true);
1199 lp = lpni->lpni_peer_net->lpn_peer;
1201 /* Only try once if discovery is disabled */
1202 if (lnet_is_discovery_disabled(lp))
1205 primary_nid = lp->lp_primary_nid;
1207 lnet_peer_ni_decref_locked(lpni);
1209 lnet_net_unlock(cpt);
1211 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1212 libcfs_nid2str(primary_nid), rc);
1215 EXPORT_SYMBOL(LNetPrimaryNID);
1217 struct lnet_peer_net *
1218 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1220 struct lnet_peer_net *peer_net;
1221 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1222 if (peer_net->lpn_net_id == net_id)
1229 * Attach a peer_ni to a peer_net and peer. This function assumes
1230 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1231 * may be attached to a different peer, in which case it will be
1232 * properly detached first. The whole operation is done atomically.
1234 * Always returns 0. This is the last function called from functions
1235 * that do return an int, so returning 0 here allows the compiler to
1239 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1240 struct lnet_peer_net *lpn,
1241 struct lnet_peer_ni *lpni,
1244 struct lnet_peer_table *ptable;
1246 /* Install the new peer_ni */
1247 lnet_net_lock(LNET_LOCK_EX);
1248 /* Add peer_ni to global peer table hash, if necessary. */
1249 if (list_empty(&lpni->lpni_hashlist)) {
1250 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1252 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1253 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1254 ptable->pt_version++;
1255 /* This is the 1st refcount on lpni. */
1256 atomic_inc(&lpni->lpni_refcount);
1259 /* Detach the peer_ni from an existing peer, if necessary. */
1260 if (lpni->lpni_peer_net) {
1261 LASSERT(lpni->lpni_peer_net != lpn);
1262 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1263 lnet_peer_detach_peer_ni_locked(lpni);
1264 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1265 lpni->lpni_peer_net = NULL;
1268 /* Add peer_ni to peer_net */
1269 lpni->lpni_peer_net = lpn;
1270 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1271 lnet_update_peer_net_healthv(lpni);
1272 lnet_peer_net_addref_locked(lpn);
1274 /* Add peer_net to peer */
1275 if (!lpn->lpn_peer) {
1277 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1278 lnet_peer_addref_locked(lp);
1281 /* Add peer to global peer list, if necessary */
1282 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1283 if (list_empty(&lp->lp_peer_list)) {
1284 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1289 /* Update peer state */
1290 spin_lock(&lp->lp_lock);
1291 if (flags & LNET_PEER_CONFIGURED) {
1292 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1293 lp->lp_state |= LNET_PEER_CONFIGURED;
1295 if (flags & LNET_PEER_MULTI_RAIL) {
1296 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1297 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1298 lnet_peer_clr_non_mr_pref_nids(lp);
1301 spin_unlock(&lp->lp_lock);
1304 lnet_net_unlock(LNET_LOCK_EX);
1306 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1307 libcfs_nid2str(lp->lp_primary_nid),
1308 libcfs_nid2str(lpni->lpni_nid), flags);
1314 * Create a new peer, with nid as its primary nid.
1316 * Call with the lnet_api_mutex held.
1319 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1321 struct lnet_peer *lp;
1322 struct lnet_peer_net *lpn;
1323 struct lnet_peer_ni *lpni;
1326 LASSERT(nid != LNET_NID_ANY);
1329 * No need for the lnet_net_lock here, because the
1330 * lnet_api_mutex is held.
1332 lpni = lnet_find_peer_ni_locked(nid);
1334 /* A peer with this NID already exists. */
1335 lp = lpni->lpni_peer_net->lpn_peer;
1336 lnet_peer_ni_decref_locked(lpni);
1338 * This is an error if the peer was configured and the
1339 * primary NID differs or an attempt is made to change
1340 * the Multi-Rail flag. Otherwise the assumption is
1341 * that an existing peer is being modified.
1343 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1344 if (lp->lp_primary_nid != nid)
1346 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1350 /* Delete and recreate as a configured peer. */
1354 /* Create peer, peer_net, and peer_ni. */
1356 lp = lnet_peer_alloc(nid);
1359 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1362 lpni = lnet_peer_ni_alloc(nid);
1366 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1369 LIBCFS_FREE(lpn, sizeof(*lpn));
1371 LIBCFS_FREE(lp, sizeof(*lp));
1373 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1374 libcfs_nid2str(nid), flags, rc);
1379 * Add a NID to a peer. Call with ln_api_mutex held.
1382 * -EPERM: Non-DLC addition to a DLC-configured peer.
1383 * -EEXIST: The NID was configured by DLC for a different peer.
1384 * -ENOMEM: Out of memory.
1385 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1386 * non-multi-rail peer.
1389 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1391 struct lnet_peer_net *lpn;
1392 struct lnet_peer_ni *lpni;
1396 LASSERT(nid != LNET_NID_ANY);
1398 /* A configured peer can only be updated through configuration. */
1399 if (!(flags & LNET_PEER_CONFIGURED)) {
1400 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1407 * The MULTI_RAIL flag can be set but not cleared, because
1408 * that would leave the peer struct in an invalid state.
1410 if (flags & LNET_PEER_MULTI_RAIL) {
1411 spin_lock(&lp->lp_lock);
1412 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1413 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1414 lnet_peer_clr_non_mr_pref_nids(lp);
1416 spin_unlock(&lp->lp_lock);
1417 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1422 lpni = lnet_find_peer_ni_locked(nid);
1425 * A peer_ni already exists. This is only a problem if
1426 * it is not connected to this peer and was configured
1429 lnet_peer_ni_decref_locked(lpni);
1430 if (lpni->lpni_peer_net->lpn_peer == lp)
1432 if (lnet_peer_ni_is_configured(lpni)) {
1436 /* If this is the primary NID, destroy the peer. */
1437 if (lnet_peer_ni_is_primary(lpni)) {
1438 struct lnet_peer *rtr_lp =
1439 lpni->lpni_peer_net->lpn_peer;
1440 int rtr_refcount = rtr_lp->lp_rtr_refcount;
1442 * if we're trying to delete a router it means
1443 * we're moving this peer NI to a new peer so must
1444 * transfer router properties to the new peer
1446 if (rtr_refcount > 0) {
1447 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1448 lnet_rtr_transfer_to_peer(rtr_lp, lp);
1450 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1451 lpni = lnet_peer_ni_alloc(nid);
1458 lpni = lnet_peer_ni_alloc(nid);
1466 * Get the peer_net. Check that we're not adding a second
1467 * peer_ni on a peer_net of a non-multi-rail peer.
1469 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1471 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1476 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1481 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1484 /* If the peer_ni was allocated above its peer_net pointer is NULL */
1485 if (!lpni->lpni_peer_net)
1486 LIBCFS_FREE(lpni, sizeof(*lpni));
1488 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1489 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1495 * Update the primary NID of a peer, if possible.
1497 * Call with the lnet_api_mutex held.
1500 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1502 lnet_nid_t old = lp->lp_primary_nid;
1505 if (lp->lp_primary_nid == nid)
1507 rc = lnet_peer_add_nid(lp, nid, flags);
1510 lp->lp_primary_nid = nid;
1512 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1513 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1518 * lpni creation initiated due to traffic either sending or receiving.
1521 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1523 struct lnet_peer *lp;
1524 struct lnet_peer_net *lpn;
1525 struct lnet_peer_ni *lpni;
1529 if (nid == LNET_NID_ANY) {
1534 /* lnet_net_lock is not needed here because ln_api_lock is held */
1535 lpni = lnet_find_peer_ni_locked(nid);
1538 * We must have raced with another thread. Since we
1539 * know next to nothing about a peer_ni created by
1540 * traffic, we just assume everything is ok and
1543 lnet_peer_ni_decref_locked(lpni);
1547 /* Create peer, peer_net, and peer_ni. */
1549 lp = lnet_peer_alloc(nid);
1552 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1555 lpni = lnet_peer_ni_alloc(nid);
1558 if (pref != LNET_NID_ANY)
1559 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1561 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1564 LIBCFS_FREE(lpn, sizeof(*lpn));
1566 LIBCFS_FREE(lp, sizeof(*lp));
1568 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1573 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1575 * This API handles the following combinations:
1576 * Create a peer with its primary NI if only the prim_nid is provided
1577 * Add a NID to a peer identified by the prim_nid. The peer identified
1578 * by the prim_nid must already exist.
1579 * The peer being created may be non-MR.
1581 * The caller must hold ln_api_mutex. This prevents the peer from
1582 * being created/modified/deleted by a different thread.
1585 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1587 struct lnet_peer *lp = NULL;
1588 struct lnet_peer_ni *lpni;
1591 /* The prim_nid must always be specified */
1592 if (prim_nid == LNET_NID_ANY)
1595 flags = LNET_PEER_CONFIGURED;
1597 flags |= LNET_PEER_MULTI_RAIL;
1600 * If nid isn't specified, we must create a new peer with
1601 * prim_nid as its primary nid.
1603 if (nid == LNET_NID_ANY)
1604 return lnet_peer_add(prim_nid, flags);
1606 /* Look up the prim_nid, which must exist. */
1607 lpni = lnet_find_peer_ni_locked(prim_nid);
1610 lnet_peer_ni_decref_locked(lpni);
1611 lp = lpni->lpni_peer_net->lpn_peer;
1613 /* Peer must have been configured. */
1614 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1615 CDEBUG(D_NET, "peer %s was not configured\n",
1616 libcfs_nid2str(prim_nid));
1620 /* Primary NID must match */
1621 if (lp->lp_primary_nid != prim_nid) {
1622 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1623 libcfs_nid2str(prim_nid),
1624 libcfs_nid2str(lp->lp_primary_nid));
1628 /* Multi-Rail flag must match. */
1629 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1630 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1631 libcfs_nid2str(prim_nid));
1635 return lnet_peer_add_nid(lp, nid, flags);
1639 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1641 * This API handles the following combinations:
1642 * Delete a NI from a peer if both prim_nid and nid are provided.
1643 * Delete a peer if only prim_nid is provided.
1644 * Delete a peer if its primary nid is provided.
1646 * The caller must hold ln_api_mutex. This prevents the peer from
1647 * being modified/deleted by a different thread.
1650 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1652 struct lnet_peer *lp;
1653 struct lnet_peer_ni *lpni;
1656 if (prim_nid == LNET_NID_ANY)
1659 lpni = lnet_find_peer_ni_locked(prim_nid);
1662 lnet_peer_ni_decref_locked(lpni);
1663 lp = lpni->lpni_peer_net->lpn_peer;
1665 if (prim_nid != lp->lp_primary_nid) {
1666 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1667 libcfs_nid2str(prim_nid),
1668 libcfs_nid2str(lp->lp_primary_nid));
1672 lnet_net_lock(LNET_LOCK_EX);
1673 if (lp->lp_rtr_refcount > 0) {
1674 lnet_net_unlock(LNET_LOCK_EX);
1675 CERROR("%s is a router. Can not be deleted\n",
1676 libcfs_nid2str(prim_nid));
1679 lnet_net_unlock(LNET_LOCK_EX);
1681 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1682 return lnet_peer_del(lp);
1684 flags = LNET_PEER_CONFIGURED;
1685 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1686 flags |= LNET_PEER_MULTI_RAIL;
1688 return lnet_peer_del_nid(lp, nid, flags);
1692 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
1694 struct lnet_peer_table *ptable;
1695 struct lnet_peer_net *lpn;
1697 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1699 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
1700 LASSERT(list_empty(&lpni->lpni_txq));
1701 LASSERT(lpni->lpni_txqnob == 0);
1702 LASSERT(list_empty(&lpni->lpni_peer_nis));
1703 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1705 lpn = lpni->lpni_peer_net;
1706 lpni->lpni_peer_net = NULL;
1707 lpni->lpni_net = NULL;
1709 /* remove the peer ni from the zombie list */
1710 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1711 spin_lock(&ptable->pt_zombie_lock);
1712 list_del_init(&lpni->lpni_hashlist);
1713 ptable->pt_zombies--;
1714 spin_unlock(&ptable->pt_zombie_lock);
1716 if (lpni->lpni_pref_nnids > 1)
1717 CFS_FREE_PTR_ARRAY(lpni->lpni_pref.nids, lpni->lpni_pref_nnids);
1719 LIBCFS_FREE(lpni, sizeof(*lpni));
1721 lnet_peer_net_decref_locked(lpn);
1724 struct lnet_peer_ni *
1725 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1727 struct lnet_peer_ni *lpni = NULL;
1730 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1731 return ERR_PTR(-ESHUTDOWN);
1734 * find if a peer_ni already exists.
1735 * If so then just return that.
1737 lpni = lnet_find_peer_ni_locked(nid);
1741 lnet_net_unlock(cpt);
1743 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1746 goto out_net_relock;
1749 lpni = lnet_find_peer_ni_locked(nid);
1759 * Get a peer_ni for the given nid, create it if necessary. Takes a
1760 * hold on the peer_ni.
1762 struct lnet_peer_ni *
1763 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1765 struct lnet_peer_ni *lpni = NULL;
1768 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1769 return ERR_PTR(-ESHUTDOWN);
1772 * find if a peer_ni already exists.
1773 * If so then just return that.
1775 lpni = lnet_find_peer_ni_locked(nid);
1781 * use the lnet_api_mutex to serialize the creation of the peer_ni
1782 * and the creation/deletion of the local ni/net. When a local ni is
1783 * created, if there exists a set of peer_nis on that network,
1784 * they need to be traversed and updated. When a local NI is
1785 * deleted, which could result in a network being deleted, then
1786 * all peer nis on that network need to be removed as well.
1788 * Creation through traffic should also be serialized with
1789 * creation through DLC.
1791 lnet_net_unlock(cpt);
1792 mutex_lock(&the_lnet.ln_api_mutex);
1794 * Shutdown is only set under the ln_api_lock, so a single
1795 * check here is sufficent.
1797 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1798 lpni = ERR_PTR(-ESHUTDOWN);
1799 goto out_mutex_unlock;
1802 rc = lnet_peer_ni_traffic_add(nid, pref);
1805 goto out_mutex_unlock;
1808 lpni = lnet_find_peer_ni_locked(nid);
1812 mutex_unlock(&the_lnet.ln_api_mutex);
1815 /* Lock has been dropped, check again for shutdown. */
1816 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1818 lnet_peer_ni_decref_locked(lpni);
1819 lpni = ERR_PTR(-ESHUTDOWN);
1826 lnet_peer_gw_discovery(struct lnet_peer *lp)
1830 spin_lock(&lp->lp_lock);
1831 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
1833 spin_unlock(&lp->lp_lock);
1839 lnet_peer_is_uptodate(struct lnet_peer *lp)
1843 spin_lock(&lp->lp_lock);
1844 rc = lnet_peer_is_uptodate_locked(lp);
1845 spin_unlock(&lp->lp_lock);
1850 * Is a peer uptodate from the point of view of discovery?
1852 * If it is currently being processed, obviously not.
1853 * A forced Ping or Push is also handled by the discovery thread.
1855 * Otherwise look at whether the peer needs rediscovering.
1858 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
1859 __must_hold(&lp->lp_lock)
1863 if (lp->lp_state & (LNET_PEER_DISCOVERING |
1864 LNET_PEER_FORCE_PING |
1865 LNET_PEER_FORCE_PUSH)) {
1867 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
1869 } else if (lnet_peer_needs_push(lp)) {
1871 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
1872 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
1884 * Queue a peer for the attention of the discovery thread. Call with
1885 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
1886 * -EALREADY if the peer was already queued.
1888 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
1892 spin_lock(&lp->lp_lock);
1893 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
1894 lp->lp_state |= LNET_PEER_DISCOVERING;
1895 spin_unlock(&lp->lp_lock);
1896 if (list_empty(&lp->lp_dc_list)) {
1897 lnet_peer_addref_locked(lp);
1898 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
1899 wake_up(&the_lnet.ln_dc_waitq);
1905 CDEBUG(D_NET, "Queue peer %s: %d\n",
1906 libcfs_nid2str(lp->lp_primary_nid), rc);
1912 * Discovery of a peer is complete. Wake all waiters on the peer.
1913 * Call with lnet_net_lock/EX held.
1915 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
1917 struct lnet_msg *msg, *tmp;
1919 LIST_HEAD(pending_msgs);
1921 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
1922 libcfs_nid2str(lp->lp_primary_nid));
1924 list_del_init(&lp->lp_dc_list);
1925 spin_lock(&lp->lp_lock);
1926 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
1927 spin_unlock(&lp->lp_lock);
1928 wake_up_all(&lp->lp_dc_waitq);
1930 if (lp->lp_rtr_refcount > 0)
1931 lnet_router_discovery_complete(lp);
1933 lnet_net_unlock(LNET_LOCK_EX);
1935 /* iterate through all pending messages and send them again */
1936 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
1937 list_del_init(&msg->msg_list);
1938 if (lp->lp_dc_error) {
1939 lnet_finalize(msg, lp->lp_dc_error);
1943 CDEBUG(D_NET, "sending pending message %s to target %s\n",
1944 lnet_msgtyp2str(msg->msg_type),
1945 libcfs_id2str(msg->msg_target));
1946 rc = lnet_send(msg->msg_src_nid_param, msg,
1947 msg->msg_rtr_nid_param);
1949 CNETERR("Error sending %s to %s: %d\n",
1950 lnet_msgtyp2str(msg->msg_type),
1951 libcfs_id2str(msg->msg_target), rc);
1952 lnet_finalize(msg, rc);
1955 lnet_net_lock(LNET_LOCK_EX);
1956 lnet_peer_decref_locked(lp);
1960 * Handle inbound push.
1961 * Like any event handler, called with lnet_res_lock/CPT held.
1963 void lnet_peer_push_event(struct lnet_event *ev)
1965 struct lnet_ping_buffer *pbuf;
1966 struct lnet_peer *lp;
1968 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start + ev->offset);
1970 /* lnet_find_peer() adds a refcount */
1971 lp = lnet_find_peer(ev->source.nid);
1973 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
1974 libcfs_nid2str(ev->initiator.nid),
1975 libcfs_nid2str(ev->source.nid));
1976 pbuf->pb_needs_post = true;
1980 /* Ensure peer state remains consistent while we modify it. */
1981 spin_lock(&lp->lp_lock);
1984 * If some kind of error happened the contents of the message
1985 * cannot be used. Clear the NIDS_UPTODATE and set the
1986 * FORCE_PING flag to trigger a ping.
1989 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1990 lp->lp_state |= LNET_PEER_FORCE_PING;
1991 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
1993 libcfs_nid2str(lp->lp_primary_nid),
1994 libcfs_nid2str(ev->source.nid));
1999 * A push with invalid or corrupted info. Clear the UPTODATE
2000 * flag to trigger a ping.
2002 if (lnet_ping_info_validate(&pbuf->pb_info)) {
2003 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2004 lp->lp_state |= LNET_PEER_FORCE_PING;
2005 CDEBUG(D_NET, "Corrupted Push from %s\n",
2006 libcfs_nid2str(lp->lp_primary_nid));
2011 * Make sure we'll allocate the correct size ping buffer when
2014 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2015 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2018 * A non-Multi-Rail peer is not supposed to be capable of
2021 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2022 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2023 libcfs_nid2str(lp->lp_primary_nid));
2028 * The peer may have discovery disabled at its end. Set
2029 * NO_DISCOVERY as appropriate.
2031 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2032 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2033 libcfs_nid2str(lp->lp_primary_nid));
2035 * If the peer is going from discovery enabled to
2036 * discovery disabled, we need to reflect that in our
2037 * representation of the peer.
2039 if (!(lp->lp_state & (LNET_PEER_NO_DISCOVERY |
2040 LNET_PEER_DISCOVERING)))
2041 lp->lp_state |= LNET_PEER_MARK_DELETION;
2042 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2043 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2044 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2045 libcfs_nid2str(lp->lp_primary_nid));
2046 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2050 * Update the MULTI_RAIL flag based on the push. If the peer
2051 * was configured with DLC then the setting should match what
2053 * NB: We verified above that the MR feature bit is set in pi_features
2055 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2056 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2057 libcfs_nid2str(lp->lp_primary_nid), lp);
2058 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2059 CWARN("Push says %s is Multi-Rail, DLC says not\n",
2060 libcfs_nid2str(lp->lp_primary_nid));
2061 } else if (lnet_peer_discovery_disabled) {
2062 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled locally\n",
2063 libcfs_nid2str(lp->lp_primary_nid), lp);
2064 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2065 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled remotely\n",
2066 libcfs_nid2str(lp->lp_primary_nid), lp);
2068 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2069 libcfs_nid2str(lp->lp_primary_nid), lp);
2070 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2071 lnet_peer_clr_non_mr_pref_nids(lp);
2075 * Check for truncation of the Put message. Clear the
2076 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2077 * and tell discovery to allocate a bigger buffer.
2079 if (ev->mlength < ev->rlength) {
2080 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2081 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2082 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2083 lp->lp_state |= LNET_PEER_FORCE_PING;
2084 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2085 libcfs_nid2str(lp->lp_primary_nid),
2086 pbuf->pb_info.pi_nnis);
2090 /* always assume new data */
2091 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2092 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2095 * If there is data present that hasn't been processed yet,
2096 * we'll replace it if the Put contained newer data and it
2097 * fits. We're racing with a Ping or earlier Push in this
2100 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2101 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2102 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2103 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2104 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2105 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2106 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2107 libcfs_nid2str(lp->lp_primary_nid),
2108 LNET_PING_BUFFER_SEQNO(pbuf),
2109 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2115 * Allocate a buffer to copy the data. On a failure we drop
2116 * the Push and set FORCE_PING to force the discovery
2117 * thread to fix the problem by pinging the peer.
2119 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2121 lp->lp_state |= LNET_PEER_FORCE_PING;
2122 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2123 libcfs_nid2str(lp->lp_primary_nid),
2124 LNET_PING_BUFFER_SEQNO(pbuf));
2129 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2130 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2131 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2132 CDEBUG(D_NET, "Received Push %s %u\n",
2133 libcfs_nid2str(lp->lp_primary_nid),
2134 LNET_PING_BUFFER_SEQNO(pbuf));
2137 /* We've processed this buffer. It can be reposted */
2138 pbuf->pb_needs_post = true;
2141 * Queue the peer for discovery if not done, force it on the request
2142 * queue and wake the discovery thread if the peer was already queued,
2143 * because its status changed.
2145 spin_unlock(&lp->lp_lock);
2146 lnet_net_lock(LNET_LOCK_EX);
2147 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2148 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2149 wake_up(&the_lnet.ln_dc_waitq);
2151 /* Drop refcount from lookup */
2152 lnet_peer_decref_locked(lp);
2153 lnet_net_unlock(LNET_LOCK_EX);
2157 * Clear the discovery error state, unless we're already discovering
2158 * this peer, in which case the error is current.
2160 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2162 spin_lock(&lp->lp_lock);
2163 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2164 lp->lp_dc_error = 0;
2165 spin_unlock(&lp->lp_lock);
2169 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2170 * dropped/retaken within this function. An lnet_peer_ni is passed in
2171 * because discovery could tear down an lnet_peer.
2174 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2177 struct lnet_peer *lp;
2182 lnet_net_unlock(cpt);
2183 lnet_net_lock(LNET_LOCK_EX);
2184 lp = lpni->lpni_peer_net->lpn_peer;
2185 lnet_peer_clear_discovery_error(lp);
2188 * We're willing to be interrupted. The lpni can become a
2189 * zombie if we race with DLC, so we must check for that.
2192 /* Keep lp alive when the lnet_net_lock is unlocked */
2193 lnet_peer_addref_locked(lp);
2194 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2195 if (signal_pending(current))
2197 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2200 * Don't repeat discovery if discovery is disabled. This is
2201 * done to ensure we can use discovery as a standard ping as
2202 * well for backwards compatibility with routers which do not
2203 * have discovery or have discovery disabled
2205 if (lnet_is_discovery_disabled(lp) && count > 0)
2207 if (lp->lp_dc_error)
2209 if (lnet_peer_is_uptodate(lp))
2211 lnet_peer_queue_for_discovery(lp);
2213 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2216 * If caller requested a non-blocking operation then
2217 * return immediately. Once discovery is complete any
2218 * pending messages that were stopped due to discovery
2219 * will be transmitted.
2224 lnet_net_unlock(LNET_LOCK_EX);
2226 finish_wait(&lp->lp_dc_waitq, &wait);
2227 lnet_net_lock(LNET_LOCK_EX);
2228 lnet_peer_decref_locked(lp);
2229 /* Peer may have changed */
2230 lp = lpni->lpni_peer_net->lpn_peer;
2232 finish_wait(&lp->lp_dc_waitq, &wait);
2234 lnet_net_unlock(LNET_LOCK_EX);
2236 lnet_peer_decref_locked(lp);
2238 * The peer may have changed, so re-check and rediscover if that turns
2239 * out to have been the case. The reference count on lp ensured that
2240 * even if it was unlinked from lpni the memory could not be recycled.
2241 * Thus the check below is sufficient to determine whether the peer
2242 * changed. If the peer changed, then lp must not be dereferenced.
2244 if (lp != lpni->lpni_peer_net->lpn_peer)
2247 if (signal_pending(current))
2249 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2251 else if (lp->lp_dc_error)
2252 rc = lp->lp_dc_error;
2254 CDEBUG(D_NET, "non-blocking discovery\n");
2255 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2258 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2259 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2260 libcfs_nid2str(lpni->lpni_nid), rc,
2261 (!block) ? "pending discovery" : "discovery complete");
2266 /* Handle an incoming ack for a push. */
2268 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2270 struct lnet_ping_buffer *pbuf;
2272 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2273 spin_lock(&lp->lp_lock);
2274 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2275 lp->lp_push_error = ev->status;
2277 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2279 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2280 spin_unlock(&lp->lp_lock);
2282 CDEBUG(D_NET, "peer %s ev->status %d\n",
2283 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2286 /* Handle a Reply message. This is the reply to a Ping message. */
2288 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2290 struct lnet_ping_buffer *pbuf;
2293 spin_lock(&lp->lp_lock);
2295 lp->lp_disc_src_nid = ev->target.nid;
2298 * If some kind of error happened the contents of message
2299 * cannot be used. Set PING_FAILED to trigger a retry.
2302 lp->lp_state |= LNET_PEER_PING_FAILED;
2303 lp->lp_ping_error = ev->status;
2304 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2306 libcfs_nid2str(lp->lp_primary_nid),
2307 libcfs_nid2str(ev->source.nid));
2311 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2312 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2313 lnet_swap_pinginfo(pbuf);
2316 * A reply with invalid or corrupted info. Set PING_FAILED to
2319 rc = lnet_ping_info_validate(&pbuf->pb_info);
2321 lp->lp_state |= LNET_PEER_PING_FAILED;
2322 lp->lp_ping_error = 0;
2323 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2324 libcfs_nid2str(lp->lp_primary_nid), rc);
2330 * The peer may have discovery disabled at its end. Set
2331 * NO_DISCOVERY as appropriate.
2333 if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) &&
2334 !lnet_peer_discovery_disabled) {
2335 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2336 libcfs_nid2str(lp->lp_primary_nid));
2337 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2339 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2340 libcfs_nid2str(lp->lp_primary_nid));
2341 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2345 * Update the MULTI_RAIL flag based on the reply. If the peer
2346 * was configured with DLC then the setting should match what
2349 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2350 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2351 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2352 libcfs_nid2str(lp->lp_primary_nid), lp);
2353 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2354 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2355 libcfs_nid2str(lp->lp_primary_nid));
2356 } else if (lnet_peer_discovery_disabled) {
2358 "peer %s(%p) not MR: DD disabled locally\n",
2359 libcfs_nid2str(lp->lp_primary_nid), lp);
2360 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2362 "peer %s(%p) not MR: DD disabled remotely\n",
2363 libcfs_nid2str(lp->lp_primary_nid), lp);
2365 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2366 libcfs_nid2str(lp->lp_primary_nid), lp);
2367 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2368 lnet_peer_clr_non_mr_pref_nids(lp);
2370 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2371 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2372 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2373 libcfs_nid2str(lp->lp_primary_nid));
2375 CERROR("Multi-Rail state vanished from %s\n",
2376 libcfs_nid2str(lp->lp_primary_nid));
2377 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2382 * Make sure we'll allocate the correct size ping buffer when
2385 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2386 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2389 * Check for truncation of the Reply. Clear PING_SENT and set
2390 * PING_FAILED to trigger a retry.
2392 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2393 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2394 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2395 lp->lp_state |= LNET_PEER_PING_FAILED;
2396 lp->lp_ping_error = 0;
2397 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2398 libcfs_nid2str(lp->lp_primary_nid),
2399 pbuf->pb_info.pi_nnis);
2404 * Check the sequence numbers in the reply. These are only
2405 * available if the reply came from a Multi-Rail peer.
2407 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2408 pbuf->pb_info.pi_nnis > 1 &&
2409 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2410 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2411 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2412 libcfs_nid2str(lp->lp_primary_nid),
2413 LNET_PING_BUFFER_SEQNO(pbuf),
2416 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2419 /* We're happy with the state of the data in the buffer. */
2420 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2421 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno, lp->lp_state);
2422 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2423 lnet_ping_buffer_decref(lp->lp_data);
2425 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2426 lnet_ping_buffer_addref(pbuf);
2429 lp->lp_state &= ~LNET_PEER_PING_SENT;
2430 spin_unlock(&lp->lp_lock);
2432 lnet_net_lock(LNET_LOCK_EX);
2434 * If this peer is a gateway, call the routing callback to
2435 * handle the ping reply
2437 if (lp->lp_rtr_refcount > 0)
2438 lnet_router_discovery_ping_reply(lp);
2439 lnet_net_unlock(LNET_LOCK_EX);
2443 * Send event handling. Only matters for error cases, where we clean
2444 * up state on the peer and peer_ni that would otherwise be updated in
2445 * the REPLY event handler for a successful Ping, and the ACK event
2446 * handler for a successful Push.
2449 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2456 spin_lock(&lp->lp_lock);
2457 if (ev->msg_type == LNET_MSG_GET) {
2458 lp->lp_state &= ~LNET_PEER_PING_SENT;
2459 lp->lp_state |= LNET_PEER_PING_FAILED;
2460 lp->lp_ping_error = ev->status;
2461 } else { /* ev->msg_type == LNET_MSG_PUT */
2462 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2463 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2464 lp->lp_push_error = ev->status;
2466 spin_unlock(&lp->lp_lock);
2467 rc = LNET_REDISCOVER_PEER;
2469 CDEBUG(D_NET, "%s Send to %s: %d\n",
2470 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2471 libcfs_nid2str(ev->target.nid), rc);
2476 * Unlink event handling. This event is only seen if a call to
2477 * LNetMDUnlink() caused the event to be unlinked. If this call was
2478 * made after the event was set up in LNetGet() or LNetPut() then we
2479 * assume the Ping or Push timed out.
2482 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2484 spin_lock(&lp->lp_lock);
2485 /* We've passed through LNetGet() */
2486 if (lp->lp_state & LNET_PEER_PING_SENT) {
2487 lp->lp_state &= ~LNET_PEER_PING_SENT;
2488 lp->lp_state |= LNET_PEER_PING_FAILED;
2489 lp->lp_ping_error = -ETIMEDOUT;
2490 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2491 libcfs_nid2str(lp->lp_primary_nid));
2493 /* We've passed through LNetPut() */
2494 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2495 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2496 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2497 lp->lp_push_error = -ETIMEDOUT;
2498 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2499 libcfs_nid2str(lp->lp_primary_nid));
2501 spin_unlock(&lp->lp_lock);
2505 * Event handler for the discovery EQ.
2507 * Called with lnet_res_lock(cpt) held. The cpt is the
2508 * lnet_cpt_of_cookie() of the md handle cookie.
2510 static void lnet_discovery_event_handler(struct lnet_event *event)
2512 struct lnet_peer *lp = event->md_user_ptr;
2513 struct lnet_ping_buffer *pbuf;
2516 /* discovery needs to take another look */
2517 rc = LNET_REDISCOVER_PEER;
2519 CDEBUG(D_NET, "Received event: %d\n", event->type);
2521 switch (event->type) {
2522 case LNET_EVENT_ACK:
2523 lnet_discovery_event_ack(lp, event);
2525 case LNET_EVENT_REPLY:
2526 lnet_discovery_event_reply(lp, event);
2528 case LNET_EVENT_SEND:
2529 /* Only send failure triggers a retry. */
2530 rc = lnet_discovery_event_send(lp, event);
2532 case LNET_EVENT_UNLINK:
2533 /* LNetMDUnlink() was called */
2534 lnet_discovery_event_unlink(lp, event);
2537 /* Invalid events. */
2540 lnet_net_lock(LNET_LOCK_EX);
2541 if (event->unlinked) {
2542 pbuf = LNET_PING_INFO_TO_BUFFER(event->md_start);
2543 lnet_ping_buffer_decref(pbuf);
2544 lnet_peer_decref_locked(lp);
2547 /* put peer back at end of request queue, if discovery not already
2549 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2550 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2551 wake_up(&the_lnet.ln_dc_waitq);
2553 lnet_net_unlock(LNET_LOCK_EX);
2557 * Build a peer from incoming data.
2559 * The NIDs in the incoming data are supposed to be structured as follows:
2562 * - other NIDs in same net
2563 * - NIDs in second net
2564 * - NIDs in third net
2566 * This due to the way the list of NIDs in the data is created.
2568 * Note that this function will mark the peer uptodate unless an
2569 * ENOMEM is encontered. All other errors are due to a conflict
2570 * between the DLC configuration and what discovery sees. We treat DLC
2571 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2572 * peer from becoming stuck in discovery.
2574 static int lnet_peer_merge_data(struct lnet_peer *lp,
2575 struct lnet_ping_buffer *pbuf)
2577 struct lnet_peer_ni *lpni;
2578 lnet_nid_t *curnis = NULL;
2579 struct lnet_ni_status *addnis = NULL;
2580 lnet_nid_t *delnis = NULL;
2590 flags = LNET_PEER_DISCOVERED;
2591 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2592 flags |= LNET_PEER_MULTI_RAIL;
2595 * Cache the routing feature for the peer; whether it is enabled
2596 * for disabled as reported by the remote peer.
2598 spin_lock(&lp->lp_lock);
2599 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
2600 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
2602 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
2603 spin_unlock(&lp->lp_lock);
2605 nnis = max_t(int, lp->lp_nnis, pbuf->pb_info.pi_nnis);
2606 CFS_ALLOC_PTR_ARRAY(curnis, nnis);
2607 CFS_ALLOC_PTR_ARRAY(addnis, nnis);
2608 CFS_ALLOC_PTR_ARRAY(delnis, nnis);
2609 if (!curnis || !addnis || !delnis) {
2617 /* Construct the list of NIDs present in peer. */
2619 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2620 curnis[ncurnis++] = lpni->lpni_nid;
2623 * Check for NIDs in pbuf not present in curnis[].
2624 * The loop starts at 1 to skip the loopback NID.
2626 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2627 for (j = 0; j < ncurnis; j++)
2628 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2631 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
2634 * Check for NIDs in curnis[] not present in pbuf.
2635 * The nested loop starts at 1 to skip the loopback NID.
2637 * But never add the loopback NID to delnis[]: if it is
2638 * present in curnis[] then this peer is for this node.
2640 for (i = 0; i < ncurnis; i++) {
2641 if (curnis[i] == LNET_NID_LO_0)
2643 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
2644 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
2646 * update the information we cache for the
2647 * peer with the latest information we
2650 lpni = lnet_find_peer_ni_locked(curnis[i]);
2652 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
2653 lnet_peer_ni_decref_locked(lpni);
2658 if (j == pbuf->pb_info.pi_nnis)
2659 delnis[ndelnis++] = curnis[i];
2663 * If we get here and the discovery is disabled then we don't want
2664 * to add or delete any NIs. We just updated the ones we have some
2665 * information on, and call it a day
2668 if (lnet_is_discovery_disabled(lp))
2671 for (i = 0; i < naddnis; i++) {
2672 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
2674 CERROR("Error adding NID %s to peer %s: %d\n",
2675 libcfs_nid2str(addnis[i].ns_nid),
2676 libcfs_nid2str(lp->lp_primary_nid), rc);
2680 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
2682 lpni->lpni_ns_status = addnis[i].ns_status;
2683 lnet_peer_ni_decref_locked(lpni);
2687 for (i = 0; i < ndelnis; i++) {
2689 * for routers it's okay to delete the primary_nid because
2690 * the upper layers don't really rely on it. So if we're
2691 * being told that the router changed its primary_nid
2692 * then it's okay to delete it.
2694 if (lp->lp_rtr_refcount > 0)
2695 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
2696 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2698 CERROR("Error deleting NID %s from peer %s: %d\n",
2699 libcfs_nid2str(delnis[i]),
2700 libcfs_nid2str(lp->lp_primary_nid), rc);
2706 * Errors other than -ENOMEM are due to peers having been
2707 * configured with DLC. Ignore these because DLC overrides
2712 CFS_FREE_PTR_ARRAY(curnis, nnis);
2713 CFS_FREE_PTR_ARRAY(addnis, nnis);
2714 CFS_FREE_PTR_ARRAY(delnis, nnis);
2715 lnet_ping_buffer_decref(pbuf);
2716 CDEBUG(D_NET, "peer %s (%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
2719 spin_lock(&lp->lp_lock);
2720 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2721 lp->lp_state |= LNET_PEER_FORCE_PING;
2722 spin_unlock(&lp->lp_lock);
2728 * The data in pbuf says lp is its primary peer, but the data was
2729 * received by a different peer. Try to update lp with the data.
2732 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2734 struct lnet_handle_md mdh;
2736 /* Queue lp for discovery, and force it on the request queue. */
2737 lnet_net_lock(LNET_LOCK_EX);
2738 if (lnet_peer_queue_for_discovery(lp))
2739 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2740 lnet_net_unlock(LNET_LOCK_EX);
2742 LNetInvalidateMDHandle(&mdh);
2745 * Decide whether we can move the peer to the DATA_PRESENT state.
2747 * We replace stale data for a multi-rail peer, repair PING_FAILED
2748 * status, and preempt FORCE_PING.
2750 * If after that we have DATA_PRESENT, we merge it into this peer.
2752 spin_lock(&lp->lp_lock);
2753 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2754 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2755 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2756 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2757 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2758 lnet_ping_buffer_decref(pbuf);
2763 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2764 lnet_ping_buffer_decref(lp->lp_data);
2766 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2768 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2769 mdh = lp->lp_ping_mdh;
2770 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2771 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2772 lp->lp_ping_error = 0;
2774 if (lp->lp_state & LNET_PEER_FORCE_PING)
2775 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2776 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2777 spin_unlock(&lp->lp_lock);
2779 if (!LNetMDHandleIsInvalid(mdh))
2783 return lnet_peer_merge_data(lp, pbuf);
2785 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2789 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
2793 for (i = 0; i < pinfo->pi_nnis; i++) {
2794 if (pinfo->pi_ni[i].ns_nid == nid)
2802 * Update a peer using the data received.
2804 static int lnet_peer_data_present(struct lnet_peer *lp)
2805 __must_hold(&lp->lp_lock)
2807 struct lnet_ping_buffer *pbuf;
2808 struct lnet_peer_ni *lpni;
2809 lnet_nid_t nid = LNET_NID_ANY;
2815 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2816 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2817 spin_unlock(&lp->lp_lock);
2820 * Modifications of peer structures are done while holding the
2821 * ln_api_mutex. A global lock is required because we may be
2822 * modifying multiple peer structures, and a mutex greatly
2823 * simplifies memory management.
2825 * The actual changes to the data structures must also protect
2826 * against concurrent lookups, for which the lnet_net_lock in
2827 * LNET_LOCK_EX mode is used.
2829 mutex_lock(&the_lnet.ln_api_mutex);
2830 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2836 * If this peer is not on the peer list then it is being torn
2837 * down, and our reference count may be all that is keeping it
2838 * alive. Don't do any work on it.
2840 if (list_empty(&lp->lp_peer_list))
2843 flags = LNET_PEER_DISCOVERED;
2844 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2845 flags |= LNET_PEER_MULTI_RAIL;
2848 * Check whether the primary NID in the message matches the
2849 * primary NID of the peer. If it does, update the peer, if
2850 * it it does not, check whether there is already a peer with
2851 * that primary NID. If no such peer exists, try to update
2852 * the primary NID of the current peer (allowed if it was
2853 * created due to message traffic) and complete the update.
2854 * If the peer did exist, hand off the data to it.
2856 * The peer for the loopback interface is a special case: this
2857 * is the peer for the local node, and we want to set its
2858 * primary NID to the correct value here. Moreover, this peer
2859 * can show up with only the loopback NID in the ping buffer.
2861 if (pbuf->pb_info.pi_nnis <= 1)
2863 nid = pbuf->pb_info.pi_ni[1].ns_nid;
2864 if (lp->lp_primary_nid == LNET_NID_LO_0) {
2865 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2867 rc = lnet_peer_merge_data(lp, pbuf);
2869 * if the primary nid of the peer is present in the ping info returned
2870 * from the peer, but it's not the local primary peer we have
2871 * cached and discovery is disabled, then we don't want to update
2872 * our local peer info, by adding or removing NIDs, we just want
2873 * to update the status of the nids that we currently have
2874 * recorded in that peer.
2876 } else if (lp->lp_primary_nid == nid ||
2877 (lnet_is_nid_in_ping_info(lp->lp_primary_nid, &pbuf->pb_info) &&
2878 lnet_is_discovery_disabled(lp))) {
2879 rc = lnet_peer_merge_data(lp, pbuf);
2881 lpni = lnet_find_peer_ni_locked(nid);
2883 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2885 CERROR("Primary NID error %s versus %s: %d\n",
2886 libcfs_nid2str(lp->lp_primary_nid),
2887 libcfs_nid2str(nid), rc);
2889 rc = lnet_peer_merge_data(lp, pbuf);
2892 struct lnet_peer *new_lp;
2893 new_lp = lpni->lpni_peer_net->lpn_peer;
2895 * if lp has discovery/MR enabled that means new_lp
2896 * should have discovery/MR enabled as well, since
2897 * it's the same peer, which we're about to merge
2899 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2900 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2901 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
2902 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
2904 rc = lnet_peer_set_primary_data(new_lp, pbuf);
2905 lnet_consolidate_routes_locked(lp, new_lp);
2906 lnet_peer_ni_decref_locked(lpni);
2910 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc,
2912 mutex_unlock(&the_lnet.ln_api_mutex);
2914 spin_lock(&lp->lp_lock);
2915 /* Tell discovery to re-check the peer immediately. */
2917 rc = LNET_REDISCOVER_PEER;
2922 * A ping failed. Clear the PING_FAILED state and set the
2923 * FORCE_PING state, to ensure a retry even if discovery is
2924 * disabled. This avoids being left with incorrect state.
2926 static int lnet_peer_ping_failed(struct lnet_peer *lp)
2927 __must_hold(&lp->lp_lock)
2929 struct lnet_handle_md mdh;
2932 mdh = lp->lp_ping_mdh;
2933 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2934 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2935 lp->lp_state |= LNET_PEER_FORCE_PING;
2936 rc = lp->lp_ping_error;
2937 lp->lp_ping_error = 0;
2938 spin_unlock(&lp->lp_lock);
2940 if (!LNetMDHandleIsInvalid(mdh))
2943 CDEBUG(D_NET, "peer %s:%d\n",
2944 libcfs_nid2str(lp->lp_primary_nid), rc);
2946 spin_lock(&lp->lp_lock);
2947 return rc ? rc : LNET_REDISCOVER_PEER;
2951 * Select NID to send a Ping or Push to.
2953 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
2955 struct lnet_peer_ni *lpni;
2957 /* Look for a direct-connected NID for this peer. */
2959 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2960 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
2965 return lpni->lpni_nid;
2967 /* Look for a routed-connected NID for this peer. */
2969 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2970 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
2975 return lpni->lpni_nid;
2977 return LNET_NID_ANY;
2980 /* Active side of ping. */
2981 static int lnet_peer_send_ping(struct lnet_peer *lp)
2982 __must_hold(&lp->lp_lock)
2989 lp->lp_state |= LNET_PEER_PING_SENT;
2990 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2991 spin_unlock(&lp->lp_lock);
2993 cpt = lnet_net_lock_current();
2994 /* Refcount for MD. */
2995 lnet_peer_addref_locked(lp);
2996 pnid = lnet_peer_select_nid(lp);
2997 lnet_net_unlock(cpt);
2999 nnis = max(lp->lp_data_nnis, LNET_INTERFACES_MIN);
3001 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
3002 the_lnet.ln_dc_handler, false);
3005 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3006 * refcount on the peer, otherwise LNetMDUnlink will be called
3007 * which will eventually do that.
3011 lnet_peer_decref_locked(lp);
3012 lnet_net_unlock(cpt);
3013 rc = -rc; /* change the rc to negative value */
3015 } else if (rc < 0) {
3019 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3021 spin_lock(&lp->lp_lock);
3025 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
3027 * The errors that get us here are considered hard errors and
3028 * cause Discovery to terminate. So we clear PING_SENT, but do
3029 * not set either PING_FAILED or FORCE_PING. In fact we need
3030 * to clear PING_FAILED, because the unlink event handler will
3031 * have set it if we called LNetMDUnlink() above.
3033 spin_lock(&lp->lp_lock);
3034 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3039 * This function exists because you cannot call LNetMDUnlink() from an
3042 static int lnet_peer_push_failed(struct lnet_peer *lp)
3043 __must_hold(&lp->lp_lock)
3045 struct lnet_handle_md mdh;
3048 mdh = lp->lp_push_mdh;
3049 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3050 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3051 rc = lp->lp_push_error;
3052 lp->lp_push_error = 0;
3053 spin_unlock(&lp->lp_lock);
3055 if (!LNetMDHandleIsInvalid(mdh))
3058 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3059 spin_lock(&lp->lp_lock);
3060 return rc ? rc : LNET_REDISCOVER_PEER;
3063 /* Active side of push. */
3064 static int lnet_peer_send_push(struct lnet_peer *lp)
3065 __must_hold(&lp->lp_lock)
3067 struct lnet_ping_buffer *pbuf;
3068 struct lnet_process_id id;
3073 /* Don't push to a non-multi-rail peer. */
3074 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3075 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3079 lp->lp_state |= LNET_PEER_PUSH_SENT;
3080 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3081 spin_unlock(&lp->lp_lock);
3083 cpt = lnet_net_lock_current();
3084 pbuf = the_lnet.ln_ping_target;
3085 lnet_ping_buffer_addref(pbuf);
3086 lnet_net_unlock(cpt);
3088 /* Push source MD */
3089 md.start = &pbuf->pb_info;
3090 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3091 md.threshold = 2; /* Put/Ack */
3094 md.handler = the_lnet.ln_dc_handler;
3097 rc = LNetMDBind(&md, LNET_UNLINK, &lp->lp_push_mdh);
3099 lnet_ping_buffer_decref(pbuf);
3100 CERROR("Can't bind push source MD: %d\n", rc);
3103 cpt = lnet_net_lock_current();
3104 /* Refcount for MD. */
3105 lnet_peer_addref_locked(lp);
3106 id.pid = LNET_PID_LUSTRE;
3107 id.nid = lnet_peer_select_nid(lp);
3108 lnet_net_unlock(cpt);
3110 if (id.nid == LNET_NID_ANY) {
3115 rc = LNetPut(lp->lp_disc_src_nid, lp->lp_push_mdh,
3116 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3117 LNET_PROTO_PING_MATCHBITS, 0, 0);
3120 * reset the discovery nid. There is no need to restrict sending
3121 * from that source, if we call lnet_push_update_to_peers(). It'll
3122 * get set to a specific NID, if we initiate discovery from the
3125 lp->lp_disc_src_nid = LNET_NID_ANY;
3130 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3132 spin_lock(&lp->lp_lock);
3136 LNetMDUnlink(lp->lp_push_mdh);
3137 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3139 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
3141 * The errors that get us here are considered hard errors and
3142 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3143 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3144 * because the unlink event handler will have set it if we
3145 * called LNetMDUnlink() above.
3147 spin_lock(&lp->lp_lock);
3148 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3153 * An unrecoverable error was encountered during discovery.
3154 * Set error status in peer and abort discovery.
3156 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3158 CDEBUG(D_NET, "Discovery error %s: %d\n",
3159 libcfs_nid2str(lp->lp_primary_nid), error);
3161 spin_lock(&lp->lp_lock);
3162 lp->lp_dc_error = error;
3163 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3164 lp->lp_state |= LNET_PEER_REDISCOVER;
3165 spin_unlock(&lp->lp_lock);
3169 * Mark the peer as discovered.
3171 static int lnet_peer_discovered(struct lnet_peer *lp)
3172 __must_hold(&lp->lp_lock)
3174 lp->lp_state |= LNET_PEER_DISCOVERED;
3175 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3176 LNET_PEER_REDISCOVER);
3178 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3185 * Discovering this peer is taking too long. Cancel any Ping or Push
3186 * that discovery is waiting on by unlinking the relevant MDs. The
3187 * lnet_discovery_event_handler() will proceed from here and complete
3190 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
3192 struct lnet_handle_md ping_mdh;
3193 struct lnet_handle_md push_mdh;
3195 LNetInvalidateMDHandle(&ping_mdh);
3196 LNetInvalidateMDHandle(&push_mdh);
3198 spin_lock(&lp->lp_lock);
3199 if (lp->lp_state & LNET_PEER_PING_SENT) {
3200 ping_mdh = lp->lp_ping_mdh;
3201 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3203 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
3204 push_mdh = lp->lp_push_mdh;
3205 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3207 spin_unlock(&lp->lp_lock);
3209 if (!LNetMDHandleIsInvalid(ping_mdh))
3210 LNetMDUnlink(ping_mdh);
3211 if (!LNetMDHandleIsInvalid(push_mdh))
3212 LNetMDUnlink(push_mdh);
3216 * Wait for work to be queued or some other change that must be
3217 * attended to. Returns non-zero if the discovery thread should shut
3220 static int lnet_peer_discovery_wait_for_work(void)
3227 cpt = lnet_net_lock_current();
3229 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3230 TASK_INTERRUPTIBLE);
3231 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3233 if (lnet_push_target_resize_needed() ||
3234 the_lnet.ln_push_target->pb_needs_post)
3236 if (!list_empty(&the_lnet.ln_dc_request))
3238 if (!list_empty(&the_lnet.ln_msg_resend))
3240 lnet_net_unlock(cpt);
3243 * wakeup max every second to check if there are peers that
3244 * have been stuck on the working queue for greater than
3247 schedule_timeout(cfs_time_seconds(1));
3248 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3249 cpt = lnet_net_lock_current();
3251 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3253 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3256 lnet_net_unlock(cpt);
3258 CDEBUG(D_NET, "woken: %d\n", rc);
3264 * Messages that were pending on a destroyed peer will be put on a global
3265 * resend list. The message resend list will be checked by
3266 * the discovery thread when it wakes up, and will resend messages. These
3267 * messages can still be sendable in the case the lpni which was the initial
3268 * cause of the message re-queue was transfered to another peer.
3270 * It is possible that LNet could be shutdown while we're iterating
3271 * through the list. lnet_shudown_lndnets() will attempt to access the
3272 * resend list, but will have to wait until the spinlock is released, by
3273 * which time there shouldn't be any more messages on the resend list.
3274 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3275 * for the messages so they can be released. The other case is that
3276 * lnet_shudown_lndnets() can finalize all the messages before this
3277 * function can visit the resend list, in which case this function will be
3280 static void lnet_resend_msgs(void)
3282 struct lnet_msg *msg, *tmp;
3286 spin_lock(&the_lnet.ln_msg_resend_lock);
3287 list_splice(&the_lnet.ln_msg_resend, &resend);
3288 spin_unlock(&the_lnet.ln_msg_resend_lock);
3290 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3291 list_del_init(&msg->msg_list);
3292 rc = lnet_send(msg->msg_src_nid_param, msg,
3293 msg->msg_rtr_nid_param);
3295 CNETERR("Error sending %s to %s: %d\n",
3296 lnet_msgtyp2str(msg->msg_type),
3297 libcfs_id2str(msg->msg_target), rc);
3298 lnet_finalize(msg, rc);
3303 /* The discovery thread. */
3304 static int lnet_peer_discovery(void *arg)
3306 struct lnet_peer *lp;
3309 wait_for_completion(&the_lnet.ln_started);
3311 CDEBUG(D_NET, "started\n");
3314 if (lnet_peer_discovery_wait_for_work())
3317 if (lnet_push_target_resize_needed())
3318 lnet_push_target_resize();
3319 else if (the_lnet.ln_push_target->pb_needs_post)
3320 lnet_push_target_post(the_lnet.ln_push_target,
3321 &the_lnet.ln_push_target_md);
3325 lnet_net_lock(LNET_LOCK_EX);
3326 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING) {
3327 lnet_net_unlock(LNET_LOCK_EX);
3332 * Process all incoming discovery work requests. When
3333 * discovery must wait on a peer to change state, it
3334 * is added to the tail of the ln_dc_working queue. A
3335 * timestamp keeps track of when the peer was added,
3336 * so we can time out discovery requests that take too
3339 while (!list_empty(&the_lnet.ln_dc_request)) {
3340 lp = list_first_entry(&the_lnet.ln_dc_request,
3341 struct lnet_peer, lp_dc_list);
3342 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3344 * set the time the peer was put on the dc_working
3345 * queue. It shouldn't remain on the queue
3346 * forever, in case the GET message (for ping)
3347 * doesn't get a REPLY or the PUT message (for
3348 * push) doesn't get an ACK.
3350 lp->lp_last_queued = ktime_get_real_seconds();
3351 lnet_net_unlock(LNET_LOCK_EX);
3353 if (lnet_push_target_resize_needed())
3354 lnet_push_target_resize();
3355 else if (the_lnet.ln_push_target->pb_needs_post)
3356 lnet_push_target_post(the_lnet.ln_push_target,
3357 &the_lnet.ln_push_target_md);
3360 * Select an action depending on the state of
3361 * the peer and whether discovery is disabled.
3362 * The check whether discovery is disabled is
3363 * done after the code that handles processing
3364 * for arrived data, cleanup for failures, and
3365 * forcing a Ping or Push.
3367 spin_lock(&lp->lp_lock);
3368 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3369 libcfs_nid2str(lp->lp_primary_nid), lp,
3371 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3372 rc = lnet_peer_data_present(lp);
3373 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3374 rc = lnet_peer_ping_failed(lp);
3375 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3376 rc = lnet_peer_push_failed(lp);
3377 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3378 rc = lnet_peer_send_ping(lp);
3379 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3380 rc = lnet_peer_send_push(lp);
3381 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3382 rc = lnet_peer_send_ping(lp);
3383 else if (lnet_peer_needs_push(lp))
3384 rc = lnet_peer_send_push(lp);
3386 rc = lnet_peer_discovered(lp);
3387 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3388 libcfs_nid2str(lp->lp_primary_nid), lp,
3390 spin_unlock(&lp->lp_lock);
3392 lnet_net_lock(LNET_LOCK_EX);
3393 if (rc == LNET_REDISCOVER_PEER) {
3394 list_move(&lp->lp_dc_list,
3395 &the_lnet.ln_dc_request);
3397 lnet_peer_discovery_error(lp, rc);
3399 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3400 lnet_peer_discovery_complete(lp);
3401 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3404 if (lp->lp_state & LNET_PEER_MARK_DELETION) {
3405 struct list_head rlist;
3406 struct lnet_route *route, *tmp;
3407 int sensitivity = lp->lp_health_sensitivity;
3409 INIT_LIST_HEAD(&rlist);
3412 * remove the peer from the discovery work
3413 * queue if it's on there in preparation
3416 if (!list_empty(&lp->lp_dc_list))
3417 list_del(&lp->lp_dc_list);
3419 lnet_net_unlock(LNET_LOCK_EX);
3421 mutex_lock(&the_lnet.ln_api_mutex);
3423 lnet_net_lock(LNET_LOCK_EX);
3424 list_for_each_entry_safe(route, tmp,
3427 lnet_move_route(route, NULL, &rlist);
3428 lnet_net_unlock(LNET_LOCK_EX);
3430 /* delete the peer */
3433 list_for_each_entry_safe(route, tmp,
3435 /* re-add these routes */
3436 lnet_add_route(route->lr_net,
3441 LIBCFS_FREE(route, sizeof(*route));
3443 mutex_unlock(&the_lnet.ln_api_mutex);
3445 lnet_net_lock(LNET_LOCK_EX);
3449 lnet_net_unlock(LNET_LOCK_EX);
3452 CDEBUG(D_NET, "stopping\n");
3454 * Clean up before telling lnet_peer_discovery_stop() that
3455 * we're done. Use wake_up() below to somewhat reduce the
3456 * size of the thundering herd if there are multiple threads
3457 * waiting on discovery of a single peer.
3460 /* Queue cleanup 1: stop all pending pings and pushes. */
3461 lnet_net_lock(LNET_LOCK_EX);
3462 while (!list_empty(&the_lnet.ln_dc_working)) {
3463 lp = list_first_entry(&the_lnet.ln_dc_working,
3464 struct lnet_peer, lp_dc_list);
3465 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3466 lnet_net_unlock(LNET_LOCK_EX);
3467 lnet_peer_cancel_discovery(lp);
3468 lnet_net_lock(LNET_LOCK_EX);
3470 lnet_net_unlock(LNET_LOCK_EX);
3472 /* Queue cleanup 2: wait for the expired queue to clear. */
3473 while (!list_empty(&the_lnet.ln_dc_expired))
3474 schedule_timeout_uninterruptible(cfs_time_seconds(1));
3476 /* Queue cleanup 3: clear the request queue. */
3477 lnet_net_lock(LNET_LOCK_EX);
3478 while (!list_empty(&the_lnet.ln_dc_request)) {
3479 lp = list_first_entry(&the_lnet.ln_dc_request,
3480 struct lnet_peer, lp_dc_list);
3481 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3482 lnet_peer_discovery_complete(lp);
3484 lnet_net_unlock(LNET_LOCK_EX);
3486 lnet_assert_handler_unused(the_lnet.ln_dc_handler);
3487 the_lnet.ln_dc_handler = NULL;
3489 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3490 wake_up(&the_lnet.ln_dc_waitq);
3492 CDEBUG(D_NET, "stopped\n");
3497 /* ln_api_mutex is held on entry. */
3498 int lnet_peer_discovery_start(void)
3500 struct task_struct *task;
3503 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3506 the_lnet.ln_dc_handler = lnet_discovery_event_handler;
3507 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3508 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3511 CERROR("Can't start peer discovery thread: %d\n", rc);
3513 the_lnet.ln_dc_handler = NULL;
3515 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3518 CDEBUG(D_NET, "discovery start: %d\n", rc);
3523 /* ln_api_mutex is held on entry. */
3524 void lnet_peer_discovery_stop(void)
3526 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3529 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3530 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3532 /* In the LNetNIInit() path we may be stopping discovery before it
3533 * entered its work loop
3535 if (!completion_done(&the_lnet.ln_started))
3536 complete(&the_lnet.ln_started);
3538 wake_up(&the_lnet.ln_dc_waitq);
3540 wait_event(the_lnet.ln_dc_waitq,
3541 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3543 LASSERT(list_empty(&the_lnet.ln_dc_request));
3544 LASSERT(list_empty(&the_lnet.ln_dc_working));
3545 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3547 CDEBUG(D_NET, "discovery stopped\n");
3553 lnet_debug_peer(lnet_nid_t nid)
3555 char *aliveness = "NA";
3556 struct lnet_peer_ni *lp;
3559 cpt = lnet_cpt_of_nid(nid, NULL);
3562 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3564 lnet_net_unlock(cpt);
3565 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3569 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3570 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3572 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3573 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
3574 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3575 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3576 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3578 lnet_peer_ni_decref_locked(lp);
3580 lnet_net_unlock(cpt);
3583 /* Gathering information for userspace. */
3585 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3586 char aliveness[LNET_MAX_STR_LEN],
3587 __u32 *cpt_iter, __u32 *refcount,
3588 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3589 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3590 __u32 *peer_tx_qnob)
3592 struct lnet_peer_table *peer_table;
3593 struct lnet_peer_ni *lp;
3598 /* get the number of CPTs */
3599 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3601 /* if the cpt number to be examined is >= the number of cpts in
3602 * the system then indicate that there are no more cpts to examin
3604 if (*cpt_iter >= lncpt)
3607 /* get the current table */
3608 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3609 /* if the ptable is NULL then there are no more cpts to examine */
3610 if (peer_table == NULL)
3613 lnet_net_lock(*cpt_iter);
3615 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3616 struct list_head *peers = &peer_table->pt_hash[j];
3618 list_for_each_entry(lp, peers, lpni_hashlist) {
3619 if (peer_index-- > 0)
3622 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3623 if (lnet_isrouter(lp) ||
3624 lnet_peer_aliveness_enabled(lp))
3625 snprintf(aliveness, LNET_MAX_STR_LEN,
3626 lnet_is_peer_ni_alive(lp) ? "up" : "down");
3628 *nid = lp->lpni_nid;
3629 *refcount = atomic_read(&lp->lpni_refcount);
3630 *ni_peer_tx_credits =
3631 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3632 *peer_tx_credits = lp->lpni_txcredits;
3633 *peer_rtr_credits = lp->lpni_rtrcredits;
3634 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3635 *peer_tx_qnob = lp->lpni_txqnob;
3641 lnet_net_unlock(*cpt_iter);
3645 return found ? 0 : -ENOENT;
3648 /* ln_api_mutex is held, which keeps the peer list stable */
3649 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3651 struct lnet_ioctl_element_stats *lpni_stats;
3652 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3653 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3654 struct lnet_peer_ni_credit_info *lpni_info;
3655 struct lnet_peer_ni *lpni;
3656 struct lnet_peer *lp;
3661 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3668 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3669 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3670 size *= lp->lp_nnis;
3671 if (size > cfg->prcfg_size) {
3672 cfg->prcfg_size = size;
3677 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3678 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3679 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3680 cfg->prcfg_count = lp->lp_nnis;
3681 cfg->prcfg_size = size;
3682 cfg->prcfg_state = lp->lp_state;
3684 /* Allocate helper buffers. */
3686 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3689 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3692 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3693 if (!lpni_msg_stats)
3694 goto out_free_stats;
3695 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3697 goto out_free_msg_stats;
3702 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3703 nid = lpni->lpni_nid;
3704 if (copy_to_user(bulk, &nid, sizeof(nid)))
3705 goto out_free_hstats;
3706 bulk += sizeof(nid);
3708 memset(lpni_info, 0, sizeof(*lpni_info));
3709 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3710 if (lnet_isrouter(lpni) ||
3711 lnet_peer_aliveness_enabled(lpni))
3712 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3713 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
3715 lpni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
3716 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3717 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3718 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3719 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3720 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3721 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3722 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3723 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3724 goto out_free_hstats;
3725 bulk += sizeof(*lpni_info);
3727 memset(lpni_stats, 0, sizeof(*lpni_stats));
3728 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3729 LNET_STATS_TYPE_SEND);
3730 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3731 LNET_STATS_TYPE_RECV);
3732 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3733 LNET_STATS_TYPE_DROP);
3734 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3735 goto out_free_hstats;
3736 bulk += sizeof(*lpni_stats);
3737 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3738 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3739 goto out_free_hstats;
3740 bulk += sizeof(*lpni_msg_stats);
3741 lpni_hstats->hlpni_network_timeout =
3742 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3743 lpni_hstats->hlpni_remote_dropped =
3744 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3745 lpni_hstats->hlpni_remote_timeout =
3746 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3747 lpni_hstats->hlpni_remote_error =
3748 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3749 lpni_hstats->hlpni_health_value =
3750 atomic_read(&lpni->lpni_healthv);
3751 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3752 goto out_free_hstats;
3753 bulk += sizeof(*lpni_hstats);
3758 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3760 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3762 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3764 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
3766 lnet_peer_decref_locked(lp);
3772 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni)
3774 /* the mt could've shutdown and cleaned up the queues */
3775 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
3778 if (list_empty(&lpni->lpni_recovery) &&
3779 atomic_read(&lpni->lpni_healthv) < LNET_MAX_HEALTH_VALUE) {
3780 CDEBUG(D_NET, "lpni %s added to recovery queue. Health = %d\n",
3781 libcfs_nid2str(lpni->lpni_nid),
3782 atomic_read(&lpni->lpni_healthv));
3783 list_add_tail(&lpni->lpni_recovery, &the_lnet.ln_mt_peerNIRecovq);
3784 lnet_peer_ni_addref_locked(lpni);
3788 /* Call with the ln_api_mutex held */
3790 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3792 struct lnet_peer_table *ptable;
3793 struct lnet_peer *lp;
3794 struct lnet_peer_net *lpn;
3795 struct lnet_peer_ni *lpni;
3799 if (the_lnet.ln_state != LNET_STATE_RUNNING)
3803 lnet_net_lock(LNET_LOCK_EX);
3804 lpni = lnet_find_peer_ni_locked(nid);
3806 lnet_net_unlock(LNET_LOCK_EX);
3809 atomic_set(&lpni->lpni_healthv, value);
3810 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3811 lnet_peer_ni_decref_locked(lpni);
3812 lnet_net_unlock(LNET_LOCK_EX);
3816 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3819 * Walk all the peers and reset the healhv for each one to the
3822 lnet_net_lock(LNET_LOCK_EX);
3823 for (cpt = 0; cpt < lncpt; cpt++) {
3824 ptable = the_lnet.ln_peer_tables[cpt];
3825 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
3826 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
3827 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
3829 atomic_set(&lpni->lpni_healthv, value);
3830 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3835 lnet_net_unlock(LNET_LOCK_EX);