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 spin_lock(&lp->lp_lock);
1197 /* force a full discovery cycle */
1198 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
1199 spin_unlock(&lp->lp_lock);
1201 rc = lnet_discover_peer_locked(lpni, cpt, true);
1204 lp = lpni->lpni_peer_net->lpn_peer;
1206 /* Only try once if discovery is disabled */
1207 if (lnet_is_discovery_disabled(lp))
1210 primary_nid = lp->lp_primary_nid;
1212 lnet_peer_ni_decref_locked(lpni);
1214 lnet_net_unlock(cpt);
1216 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1217 libcfs_nid2str(primary_nid), rc);
1220 EXPORT_SYMBOL(LNetPrimaryNID);
1222 struct lnet_peer_net *
1223 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1225 struct lnet_peer_net *peer_net;
1226 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1227 if (peer_net->lpn_net_id == net_id)
1234 * Attach a peer_ni to a peer_net and peer. This function assumes
1235 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1236 * may be attached to a different peer, in which case it will be
1237 * properly detached first. The whole operation is done atomically.
1239 * Always returns 0. This is the last function called from functions
1240 * that do return an int, so returning 0 here allows the compiler to
1244 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1245 struct lnet_peer_net *lpn,
1246 struct lnet_peer_ni *lpni,
1249 struct lnet_peer_table *ptable;
1251 /* Install the new peer_ni */
1252 lnet_net_lock(LNET_LOCK_EX);
1253 /* Add peer_ni to global peer table hash, if necessary. */
1254 if (list_empty(&lpni->lpni_hashlist)) {
1255 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1257 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1258 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1259 ptable->pt_version++;
1260 /* This is the 1st refcount on lpni. */
1261 atomic_inc(&lpni->lpni_refcount);
1264 /* Detach the peer_ni from an existing peer, if necessary. */
1265 if (lpni->lpni_peer_net) {
1266 LASSERT(lpni->lpni_peer_net != lpn);
1267 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1268 lnet_peer_detach_peer_ni_locked(lpni);
1269 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1270 lpni->lpni_peer_net = NULL;
1273 /* Add peer_ni to peer_net */
1274 lpni->lpni_peer_net = lpn;
1275 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1276 lnet_update_peer_net_healthv(lpni);
1277 lnet_peer_net_addref_locked(lpn);
1279 /* Add peer_net to peer */
1280 if (!lpn->lpn_peer) {
1282 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1283 lnet_peer_addref_locked(lp);
1286 /* Add peer to global peer list, if necessary */
1287 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1288 if (list_empty(&lp->lp_peer_list)) {
1289 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1294 /* Update peer state */
1295 spin_lock(&lp->lp_lock);
1296 if (flags & LNET_PEER_CONFIGURED) {
1297 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1298 lp->lp_state |= LNET_PEER_CONFIGURED;
1300 if (flags & LNET_PEER_MULTI_RAIL) {
1301 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1302 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1303 lnet_peer_clr_non_mr_pref_nids(lp);
1306 spin_unlock(&lp->lp_lock);
1309 lnet_net_unlock(LNET_LOCK_EX);
1311 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1312 libcfs_nid2str(lp->lp_primary_nid),
1313 libcfs_nid2str(lpni->lpni_nid), flags);
1319 * Create a new peer, with nid as its primary nid.
1321 * Call with the lnet_api_mutex held.
1324 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1326 struct lnet_peer *lp;
1327 struct lnet_peer_net *lpn;
1328 struct lnet_peer_ni *lpni;
1331 LASSERT(nid != LNET_NID_ANY);
1334 * No need for the lnet_net_lock here, because the
1335 * lnet_api_mutex is held.
1337 lpni = lnet_find_peer_ni_locked(nid);
1339 /* A peer with this NID already exists. */
1340 lp = lpni->lpni_peer_net->lpn_peer;
1341 lnet_peer_ni_decref_locked(lpni);
1343 * This is an error if the peer was configured and the
1344 * primary NID differs or an attempt is made to change
1345 * the Multi-Rail flag. Otherwise the assumption is
1346 * that an existing peer is being modified.
1348 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1349 if (lp->lp_primary_nid != nid)
1351 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1355 /* Delete and recreate as a configured peer. */
1359 /* Create peer, peer_net, and peer_ni. */
1361 lp = lnet_peer_alloc(nid);
1364 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1367 lpni = lnet_peer_ni_alloc(nid);
1371 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1374 LIBCFS_FREE(lpn, sizeof(*lpn));
1376 LIBCFS_FREE(lp, sizeof(*lp));
1378 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1379 libcfs_nid2str(nid), flags, rc);
1384 * Add a NID to a peer. Call with ln_api_mutex held.
1387 * -EPERM: Non-DLC addition to a DLC-configured peer.
1388 * -EEXIST: The NID was configured by DLC for a different peer.
1389 * -ENOMEM: Out of memory.
1390 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1391 * non-multi-rail peer.
1394 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1396 struct lnet_peer_net *lpn;
1397 struct lnet_peer_ni *lpni;
1401 LASSERT(nid != LNET_NID_ANY);
1403 /* A configured peer can only be updated through configuration. */
1404 if (!(flags & LNET_PEER_CONFIGURED)) {
1405 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1412 * The MULTI_RAIL flag can be set but not cleared, because
1413 * that would leave the peer struct in an invalid state.
1415 if (flags & LNET_PEER_MULTI_RAIL) {
1416 spin_lock(&lp->lp_lock);
1417 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1418 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1419 lnet_peer_clr_non_mr_pref_nids(lp);
1421 spin_unlock(&lp->lp_lock);
1422 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1427 lpni = lnet_find_peer_ni_locked(nid);
1430 * A peer_ni already exists. This is only a problem if
1431 * it is not connected to this peer and was configured
1434 lnet_peer_ni_decref_locked(lpni);
1435 if (lpni->lpni_peer_net->lpn_peer == lp)
1437 if (lnet_peer_ni_is_configured(lpni)) {
1441 /* If this is the primary NID, destroy the peer. */
1442 if (lnet_peer_ni_is_primary(lpni)) {
1443 struct lnet_peer *rtr_lp =
1444 lpni->lpni_peer_net->lpn_peer;
1445 int rtr_refcount = rtr_lp->lp_rtr_refcount;
1447 * if we're trying to delete a router it means
1448 * we're moving this peer NI to a new peer so must
1449 * transfer router properties to the new peer
1451 if (rtr_refcount > 0) {
1452 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1453 lnet_rtr_transfer_to_peer(rtr_lp, lp);
1455 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1456 lpni = lnet_peer_ni_alloc(nid);
1463 lpni = lnet_peer_ni_alloc(nid);
1471 * Get the peer_net. Check that we're not adding a second
1472 * peer_ni on a peer_net of a non-multi-rail peer.
1474 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1476 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1481 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1486 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1489 /* If the peer_ni was allocated above its peer_net pointer is NULL */
1490 if (!lpni->lpni_peer_net)
1491 LIBCFS_FREE(lpni, sizeof(*lpni));
1493 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1494 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1500 * Update the primary NID of a peer, if possible.
1502 * Call with the lnet_api_mutex held.
1505 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1507 lnet_nid_t old = lp->lp_primary_nid;
1510 if (lp->lp_primary_nid == nid)
1512 rc = lnet_peer_add_nid(lp, nid, flags);
1515 lp->lp_primary_nid = nid;
1517 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1518 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1523 * lpni creation initiated due to traffic either sending or receiving.
1526 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1528 struct lnet_peer *lp;
1529 struct lnet_peer_net *lpn;
1530 struct lnet_peer_ni *lpni;
1534 if (nid == LNET_NID_ANY) {
1539 /* lnet_net_lock is not needed here because ln_api_lock is held */
1540 lpni = lnet_find_peer_ni_locked(nid);
1543 * We must have raced with another thread. Since we
1544 * know next to nothing about a peer_ni created by
1545 * traffic, we just assume everything is ok and
1548 lnet_peer_ni_decref_locked(lpni);
1552 /* Create peer, peer_net, and peer_ni. */
1554 lp = lnet_peer_alloc(nid);
1557 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1560 lpni = lnet_peer_ni_alloc(nid);
1563 if (pref != LNET_NID_ANY)
1564 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1566 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1569 LIBCFS_FREE(lpn, sizeof(*lpn));
1571 LIBCFS_FREE(lp, sizeof(*lp));
1573 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1578 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1580 * This API handles the following combinations:
1581 * Create a peer with its primary NI if only the prim_nid is provided
1582 * Add a NID to a peer identified by the prim_nid. The peer identified
1583 * by the prim_nid must already exist.
1584 * The peer being created may be non-MR.
1586 * The caller must hold ln_api_mutex. This prevents the peer from
1587 * being created/modified/deleted by a different thread.
1590 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1592 struct lnet_peer *lp = NULL;
1593 struct lnet_peer_ni *lpni;
1596 /* The prim_nid must always be specified */
1597 if (prim_nid == LNET_NID_ANY)
1600 flags = LNET_PEER_CONFIGURED;
1602 flags |= LNET_PEER_MULTI_RAIL;
1605 * If nid isn't specified, we must create a new peer with
1606 * prim_nid as its primary nid.
1608 if (nid == LNET_NID_ANY)
1609 return lnet_peer_add(prim_nid, flags);
1611 /* Look up the prim_nid, which must exist. */
1612 lpni = lnet_find_peer_ni_locked(prim_nid);
1615 lnet_peer_ni_decref_locked(lpni);
1616 lp = lpni->lpni_peer_net->lpn_peer;
1618 /* Peer must have been configured. */
1619 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1620 CDEBUG(D_NET, "peer %s was not configured\n",
1621 libcfs_nid2str(prim_nid));
1625 /* Primary NID must match */
1626 if (lp->lp_primary_nid != prim_nid) {
1627 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1628 libcfs_nid2str(prim_nid),
1629 libcfs_nid2str(lp->lp_primary_nid));
1633 /* Multi-Rail flag must match. */
1634 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1635 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1636 libcfs_nid2str(prim_nid));
1640 return lnet_peer_add_nid(lp, nid, flags);
1644 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1646 * This API handles the following combinations:
1647 * Delete a NI from a peer if both prim_nid and nid are provided.
1648 * Delete a peer if only prim_nid is provided.
1649 * Delete a peer if its primary nid is provided.
1651 * The caller must hold ln_api_mutex. This prevents the peer from
1652 * being modified/deleted by a different thread.
1655 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1657 struct lnet_peer *lp;
1658 struct lnet_peer_ni *lpni;
1661 if (prim_nid == LNET_NID_ANY)
1664 lpni = lnet_find_peer_ni_locked(prim_nid);
1667 lnet_peer_ni_decref_locked(lpni);
1668 lp = lpni->lpni_peer_net->lpn_peer;
1670 if (prim_nid != lp->lp_primary_nid) {
1671 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1672 libcfs_nid2str(prim_nid),
1673 libcfs_nid2str(lp->lp_primary_nid));
1677 lnet_net_lock(LNET_LOCK_EX);
1678 if (lp->lp_rtr_refcount > 0) {
1679 lnet_net_unlock(LNET_LOCK_EX);
1680 CERROR("%s is a router. Can not be deleted\n",
1681 libcfs_nid2str(prim_nid));
1684 lnet_net_unlock(LNET_LOCK_EX);
1686 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1687 return lnet_peer_del(lp);
1689 flags = LNET_PEER_CONFIGURED;
1690 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1691 flags |= LNET_PEER_MULTI_RAIL;
1693 return lnet_peer_del_nid(lp, nid, flags);
1697 lnet_destroy_peer_ni_locked(struct lnet_peer_ni *lpni)
1699 struct lnet_peer_table *ptable;
1700 struct lnet_peer_net *lpn;
1702 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1704 LASSERT(atomic_read(&lpni->lpni_refcount) == 0);
1705 LASSERT(list_empty(&lpni->lpni_txq));
1706 LASSERT(lpni->lpni_txqnob == 0);
1707 LASSERT(list_empty(&lpni->lpni_peer_nis));
1708 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1710 lpn = lpni->lpni_peer_net;
1711 lpni->lpni_peer_net = NULL;
1712 lpni->lpni_net = NULL;
1714 /* remove the peer ni from the zombie list */
1715 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1716 spin_lock(&ptable->pt_zombie_lock);
1717 list_del_init(&lpni->lpni_hashlist);
1718 ptable->pt_zombies--;
1719 spin_unlock(&ptable->pt_zombie_lock);
1721 if (lpni->lpni_pref_nnids > 1)
1722 CFS_FREE_PTR_ARRAY(lpni->lpni_pref.nids, lpni->lpni_pref_nnids);
1724 LIBCFS_FREE(lpni, sizeof(*lpni));
1726 lnet_peer_net_decref_locked(lpn);
1729 struct lnet_peer_ni *
1730 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1732 struct lnet_peer_ni *lpni = NULL;
1735 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1736 return ERR_PTR(-ESHUTDOWN);
1739 * find if a peer_ni already exists.
1740 * If so then just return that.
1742 lpni = lnet_find_peer_ni_locked(nid);
1746 lnet_net_unlock(cpt);
1748 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1751 goto out_net_relock;
1754 lpni = lnet_find_peer_ni_locked(nid);
1764 * Get a peer_ni for the given nid, create it if necessary. Takes a
1765 * hold on the peer_ni.
1767 struct lnet_peer_ni *
1768 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1770 struct lnet_peer_ni *lpni = NULL;
1773 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1774 return ERR_PTR(-ESHUTDOWN);
1777 * find if a peer_ni already exists.
1778 * If so then just return that.
1780 lpni = lnet_find_peer_ni_locked(nid);
1786 * use the lnet_api_mutex to serialize the creation of the peer_ni
1787 * and the creation/deletion of the local ni/net. When a local ni is
1788 * created, if there exists a set of peer_nis on that network,
1789 * they need to be traversed and updated. When a local NI is
1790 * deleted, which could result in a network being deleted, then
1791 * all peer nis on that network need to be removed as well.
1793 * Creation through traffic should also be serialized with
1794 * creation through DLC.
1796 lnet_net_unlock(cpt);
1797 mutex_lock(&the_lnet.ln_api_mutex);
1799 * Shutdown is only set under the ln_api_lock, so a single
1800 * check here is sufficent.
1802 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1803 lpni = ERR_PTR(-ESHUTDOWN);
1804 goto out_mutex_unlock;
1807 rc = lnet_peer_ni_traffic_add(nid, pref);
1810 goto out_mutex_unlock;
1813 lpni = lnet_find_peer_ni_locked(nid);
1817 mutex_unlock(&the_lnet.ln_api_mutex);
1820 /* Lock has been dropped, check again for shutdown. */
1821 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1823 lnet_peer_ni_decref_locked(lpni);
1824 lpni = ERR_PTR(-ESHUTDOWN);
1831 lnet_peer_gw_discovery(struct lnet_peer *lp)
1835 spin_lock(&lp->lp_lock);
1836 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
1838 spin_unlock(&lp->lp_lock);
1844 lnet_peer_is_uptodate(struct lnet_peer *lp)
1848 spin_lock(&lp->lp_lock);
1849 rc = lnet_peer_is_uptodate_locked(lp);
1850 spin_unlock(&lp->lp_lock);
1855 * Is a peer uptodate from the point of view of discovery?
1857 * If it is currently being processed, obviously not.
1858 * A forced Ping or Push is also handled by the discovery thread.
1860 * Otherwise look at whether the peer needs rediscovering.
1863 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
1864 __must_hold(&lp->lp_lock)
1868 if (lp->lp_state & (LNET_PEER_DISCOVERING |
1869 LNET_PEER_FORCE_PING |
1870 LNET_PEER_FORCE_PUSH)) {
1872 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
1874 } else if (lnet_peer_needs_push(lp)) {
1876 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
1877 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
1889 * Queue a peer for the attention of the discovery thread. Call with
1890 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
1891 * -EALREADY if the peer was already queued.
1893 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
1897 spin_lock(&lp->lp_lock);
1898 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
1899 lp->lp_state |= LNET_PEER_DISCOVERING;
1900 spin_unlock(&lp->lp_lock);
1901 if (list_empty(&lp->lp_dc_list)) {
1902 lnet_peer_addref_locked(lp);
1903 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
1904 wake_up(&the_lnet.ln_dc_waitq);
1910 CDEBUG(D_NET, "Queue peer %s: %d\n",
1911 libcfs_nid2str(lp->lp_primary_nid), rc);
1917 * Discovery of a peer is complete. Wake all waiters on the peer.
1918 * Call with lnet_net_lock/EX held.
1920 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
1922 struct lnet_msg *msg, *tmp;
1924 LIST_HEAD(pending_msgs);
1926 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
1927 libcfs_nid2str(lp->lp_primary_nid));
1929 list_del_init(&lp->lp_dc_list);
1930 spin_lock(&lp->lp_lock);
1931 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
1932 spin_unlock(&lp->lp_lock);
1933 wake_up_all(&lp->lp_dc_waitq);
1935 if (lp->lp_rtr_refcount > 0)
1936 lnet_router_discovery_complete(lp);
1938 lnet_net_unlock(LNET_LOCK_EX);
1940 /* iterate through all pending messages and send them again */
1941 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
1942 list_del_init(&msg->msg_list);
1943 if (lp->lp_dc_error) {
1944 lnet_finalize(msg, lp->lp_dc_error);
1948 CDEBUG(D_NET, "sending pending message %s to target %s\n",
1949 lnet_msgtyp2str(msg->msg_type),
1950 libcfs_id2str(msg->msg_target));
1951 rc = lnet_send(msg->msg_src_nid_param, msg,
1952 msg->msg_rtr_nid_param);
1954 CNETERR("Error sending %s to %s: %d\n",
1955 lnet_msgtyp2str(msg->msg_type),
1956 libcfs_id2str(msg->msg_target), rc);
1957 lnet_finalize(msg, rc);
1960 lnet_net_lock(LNET_LOCK_EX);
1961 lnet_peer_decref_locked(lp);
1965 * Handle inbound push.
1966 * Like any event handler, called with lnet_res_lock/CPT held.
1968 void lnet_peer_push_event(struct lnet_event *ev)
1970 struct lnet_ping_buffer *pbuf;
1971 struct lnet_peer *lp;
1973 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start + ev->offset);
1975 /* lnet_find_peer() adds a refcount */
1976 lp = lnet_find_peer(ev->source.nid);
1978 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
1979 libcfs_nid2str(ev->initiator.nid),
1980 libcfs_nid2str(ev->source.nid));
1981 pbuf->pb_needs_post = true;
1985 /* Ensure peer state remains consistent while we modify it. */
1986 spin_lock(&lp->lp_lock);
1989 * If some kind of error happened the contents of the message
1990 * cannot be used. Clear the NIDS_UPTODATE and set the
1991 * FORCE_PING flag to trigger a ping.
1994 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1995 lp->lp_state |= LNET_PEER_FORCE_PING;
1996 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
1998 libcfs_nid2str(lp->lp_primary_nid),
1999 libcfs_nid2str(ev->source.nid));
2004 * A push with invalid or corrupted info. Clear the UPTODATE
2005 * flag to trigger a ping.
2007 if (lnet_ping_info_validate(&pbuf->pb_info)) {
2008 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2009 lp->lp_state |= LNET_PEER_FORCE_PING;
2010 CDEBUG(D_NET, "Corrupted Push from %s\n",
2011 libcfs_nid2str(lp->lp_primary_nid));
2016 * Make sure we'll allocate the correct size ping buffer when
2019 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2020 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2023 * A non-Multi-Rail peer is not supposed to be capable of
2026 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2027 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2028 libcfs_nid2str(lp->lp_primary_nid));
2033 * The peer may have discovery disabled at its end. Set
2034 * NO_DISCOVERY as appropriate.
2036 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2037 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2038 libcfs_nid2str(lp->lp_primary_nid));
2040 * Mark the peer for deletion if we already know about it
2041 * and it's going from discovery set to no discovery set
2043 if (!(lp->lp_state & (LNET_PEER_NO_DISCOVERY |
2044 LNET_PEER_DISCOVERING)) &&
2045 lp->lp_state & LNET_PEER_DISCOVERED) {
2046 CDEBUG(D_NET, "Marking %s:0x%x for deletion\n",
2047 libcfs_nid2str(lp->lp_primary_nid),
2049 lp->lp_state |= LNET_PEER_MARK_DELETION;
2051 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2052 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2053 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2054 libcfs_nid2str(lp->lp_primary_nid));
2055 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2059 * Update the MULTI_RAIL flag based on the push. If the peer
2060 * was configured with DLC then the setting should match what
2062 * NB: We verified above that the MR feature bit is set in pi_features
2064 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2065 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2066 libcfs_nid2str(lp->lp_primary_nid), lp);
2067 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2068 CWARN("Push says %s is Multi-Rail, DLC says not\n",
2069 libcfs_nid2str(lp->lp_primary_nid));
2070 } else if (lnet_peer_discovery_disabled) {
2071 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled locally\n",
2072 libcfs_nid2str(lp->lp_primary_nid), lp);
2073 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2074 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled remotely\n",
2075 libcfs_nid2str(lp->lp_primary_nid), lp);
2077 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2078 libcfs_nid2str(lp->lp_primary_nid), lp);
2079 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2080 lnet_peer_clr_non_mr_pref_nids(lp);
2084 * Check for truncation of the Put message. Clear the
2085 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2086 * and tell discovery to allocate a bigger buffer.
2088 if (ev->mlength < ev->rlength) {
2089 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2090 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2091 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2092 lp->lp_state |= LNET_PEER_FORCE_PING;
2093 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2094 libcfs_nid2str(lp->lp_primary_nid),
2095 pbuf->pb_info.pi_nnis);
2099 /* always assume new data */
2100 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2101 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2104 * If there is data present that hasn't been processed yet,
2105 * we'll replace it if the Put contained newer data and it
2106 * fits. We're racing with a Ping or earlier Push in this
2109 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2110 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2111 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2112 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2113 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2114 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2115 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2116 libcfs_nid2str(lp->lp_primary_nid),
2117 LNET_PING_BUFFER_SEQNO(pbuf),
2118 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2124 * Allocate a buffer to copy the data. On a failure we drop
2125 * the Push and set FORCE_PING to force the discovery
2126 * thread to fix the problem by pinging the peer.
2128 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2130 lp->lp_state |= LNET_PEER_FORCE_PING;
2131 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2132 libcfs_nid2str(lp->lp_primary_nid),
2133 LNET_PING_BUFFER_SEQNO(pbuf));
2138 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2139 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2140 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2141 CDEBUG(D_NET, "Received Push %s %u\n",
2142 libcfs_nid2str(lp->lp_primary_nid),
2143 LNET_PING_BUFFER_SEQNO(pbuf));
2146 /* We've processed this buffer. It can be reposted */
2147 pbuf->pb_needs_post = true;
2150 * Queue the peer for discovery if not done, force it on the request
2151 * queue and wake the discovery thread if the peer was already queued,
2152 * because its status changed.
2154 spin_unlock(&lp->lp_lock);
2155 lnet_net_lock(LNET_LOCK_EX);
2156 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2157 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2158 wake_up(&the_lnet.ln_dc_waitq);
2160 /* Drop refcount from lookup */
2161 lnet_peer_decref_locked(lp);
2162 lnet_net_unlock(LNET_LOCK_EX);
2166 * Clear the discovery error state, unless we're already discovering
2167 * this peer, in which case the error is current.
2169 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2171 spin_lock(&lp->lp_lock);
2172 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2173 lp->lp_dc_error = 0;
2174 spin_unlock(&lp->lp_lock);
2178 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2179 * dropped/retaken within this function. An lnet_peer_ni is passed in
2180 * because discovery could tear down an lnet_peer.
2183 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2186 struct lnet_peer *lp;
2191 lnet_net_unlock(cpt);
2192 lnet_net_lock(LNET_LOCK_EX);
2193 lp = lpni->lpni_peer_net->lpn_peer;
2194 lnet_peer_clear_discovery_error(lp);
2197 * We're willing to be interrupted. The lpni can become a
2198 * zombie if we race with DLC, so we must check for that.
2201 /* Keep lp alive when the lnet_net_lock is unlocked */
2202 lnet_peer_addref_locked(lp);
2203 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2204 if (signal_pending(current))
2206 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2209 * Don't repeat discovery if discovery is disabled. This is
2210 * done to ensure we can use discovery as a standard ping as
2211 * well for backwards compatibility with routers which do not
2212 * have discovery or have discovery disabled
2214 if (lnet_is_discovery_disabled(lp) && count > 0)
2216 if (lp->lp_dc_error)
2218 if (lnet_peer_is_uptodate(lp))
2220 lnet_peer_queue_for_discovery(lp);
2222 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2225 * If caller requested a non-blocking operation then
2226 * return immediately. Once discovery is complete any
2227 * pending messages that were stopped due to discovery
2228 * will be transmitted.
2233 lnet_net_unlock(LNET_LOCK_EX);
2235 finish_wait(&lp->lp_dc_waitq, &wait);
2236 lnet_net_lock(LNET_LOCK_EX);
2237 lnet_peer_decref_locked(lp);
2238 /* Peer may have changed */
2239 lp = lpni->lpni_peer_net->lpn_peer;
2241 finish_wait(&lp->lp_dc_waitq, &wait);
2243 lnet_net_unlock(LNET_LOCK_EX);
2245 lnet_peer_decref_locked(lp);
2247 * The peer may have changed, so re-check and rediscover if that turns
2248 * out to have been the case. The reference count on lp ensured that
2249 * even if it was unlinked from lpni the memory could not be recycled.
2250 * Thus the check below is sufficient to determine whether the peer
2251 * changed. If the peer changed, then lp must not be dereferenced.
2253 if (lp != lpni->lpni_peer_net->lpn_peer)
2256 if (signal_pending(current))
2258 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2260 else if (lp->lp_dc_error)
2261 rc = lp->lp_dc_error;
2263 CDEBUG(D_NET, "non-blocking discovery\n");
2264 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2267 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2268 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2269 libcfs_nid2str(lpni->lpni_nid), rc,
2270 (!block) ? "pending discovery" : "discovery complete");
2275 /* Handle an incoming ack for a push. */
2277 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2279 struct lnet_ping_buffer *pbuf;
2281 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2282 spin_lock(&lp->lp_lock);
2283 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2284 lp->lp_push_error = ev->status;
2286 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2288 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2289 spin_unlock(&lp->lp_lock);
2291 CDEBUG(D_NET, "peer %s ev->status %d\n",
2292 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2295 /* Handle a Reply message. This is the reply to a Ping message. */
2297 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2299 struct lnet_ping_buffer *pbuf;
2302 spin_lock(&lp->lp_lock);
2304 lp->lp_disc_src_nid = ev->target.nid;
2307 * If some kind of error happened the contents of message
2308 * cannot be used. Set PING_FAILED to trigger a retry.
2311 lp->lp_state |= LNET_PEER_PING_FAILED;
2312 lp->lp_ping_error = ev->status;
2313 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2315 libcfs_nid2str(lp->lp_primary_nid),
2316 libcfs_nid2str(ev->source.nid));
2320 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2321 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2322 lnet_swap_pinginfo(pbuf);
2325 * A reply with invalid or corrupted info. Set PING_FAILED to
2328 rc = lnet_ping_info_validate(&pbuf->pb_info);
2330 lp->lp_state |= LNET_PEER_PING_FAILED;
2331 lp->lp_ping_error = 0;
2332 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2333 libcfs_nid2str(lp->lp_primary_nid), rc);
2339 * The peer may have discovery disabled at its end. Set
2340 * NO_DISCOVERY as appropriate.
2342 if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) &&
2343 !lnet_peer_discovery_disabled) {
2344 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2345 libcfs_nid2str(lp->lp_primary_nid));
2346 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2348 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2349 libcfs_nid2str(lp->lp_primary_nid));
2350 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2354 * Update the MULTI_RAIL flag based on the reply. If the peer
2355 * was configured with DLC then the setting should match what
2358 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2359 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2360 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2361 libcfs_nid2str(lp->lp_primary_nid), lp);
2362 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2363 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2364 libcfs_nid2str(lp->lp_primary_nid));
2365 } else if (lnet_peer_discovery_disabled) {
2367 "peer %s(%p) not MR: DD disabled locally\n",
2368 libcfs_nid2str(lp->lp_primary_nid), lp);
2369 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2371 "peer %s(%p) not MR: DD disabled remotely\n",
2372 libcfs_nid2str(lp->lp_primary_nid), lp);
2374 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2375 libcfs_nid2str(lp->lp_primary_nid), lp);
2376 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2377 lnet_peer_clr_non_mr_pref_nids(lp);
2379 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2380 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2381 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2382 libcfs_nid2str(lp->lp_primary_nid));
2384 CERROR("Multi-Rail state vanished from %s\n",
2385 libcfs_nid2str(lp->lp_primary_nid));
2386 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2391 * Make sure we'll allocate the correct size ping buffer when
2394 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2395 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2398 * Check for truncation of the Reply. Clear PING_SENT and set
2399 * PING_FAILED to trigger a retry.
2401 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2402 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2403 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2404 lp->lp_state |= LNET_PEER_PING_FAILED;
2405 lp->lp_ping_error = 0;
2406 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2407 libcfs_nid2str(lp->lp_primary_nid),
2408 pbuf->pb_info.pi_nnis);
2413 * Check the sequence numbers in the reply. These are only
2414 * available if the reply came from a Multi-Rail peer.
2416 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2417 pbuf->pb_info.pi_nnis > 1 &&
2418 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2419 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2420 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2421 libcfs_nid2str(lp->lp_primary_nid),
2422 LNET_PING_BUFFER_SEQNO(pbuf),
2425 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2428 /* We're happy with the state of the data in the buffer. */
2429 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2430 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno, lp->lp_state);
2431 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2432 lnet_ping_buffer_decref(lp->lp_data);
2434 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2435 lnet_ping_buffer_addref(pbuf);
2438 lp->lp_state &= ~LNET_PEER_PING_SENT;
2439 spin_unlock(&lp->lp_lock);
2441 lnet_net_lock(LNET_LOCK_EX);
2443 * If this peer is a gateway, call the routing callback to
2444 * handle the ping reply
2446 if (lp->lp_rtr_refcount > 0)
2447 lnet_router_discovery_ping_reply(lp);
2448 lnet_net_unlock(LNET_LOCK_EX);
2452 * Send event handling. Only matters for error cases, where we clean
2453 * up state on the peer and peer_ni that would otherwise be updated in
2454 * the REPLY event handler for a successful Ping, and the ACK event
2455 * handler for a successful Push.
2458 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2465 spin_lock(&lp->lp_lock);
2466 if (ev->msg_type == LNET_MSG_GET) {
2467 lp->lp_state &= ~LNET_PEER_PING_SENT;
2468 lp->lp_state |= LNET_PEER_PING_FAILED;
2469 lp->lp_ping_error = ev->status;
2470 } else { /* ev->msg_type == LNET_MSG_PUT */
2471 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2472 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2473 lp->lp_push_error = ev->status;
2475 spin_unlock(&lp->lp_lock);
2476 rc = LNET_REDISCOVER_PEER;
2478 CDEBUG(D_NET, "%s Send to %s: %d\n",
2479 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2480 libcfs_nid2str(ev->target.nid), rc);
2485 * Unlink event handling. This event is only seen if a call to
2486 * LNetMDUnlink() caused the event to be unlinked. If this call was
2487 * made after the event was set up in LNetGet() or LNetPut() then we
2488 * assume the Ping or Push timed out.
2491 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2493 spin_lock(&lp->lp_lock);
2494 /* We've passed through LNetGet() */
2495 if (lp->lp_state & LNET_PEER_PING_SENT) {
2496 lp->lp_state &= ~LNET_PEER_PING_SENT;
2497 lp->lp_state |= LNET_PEER_PING_FAILED;
2498 lp->lp_ping_error = -ETIMEDOUT;
2499 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2500 libcfs_nid2str(lp->lp_primary_nid));
2502 /* We've passed through LNetPut() */
2503 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2504 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2505 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2506 lp->lp_push_error = -ETIMEDOUT;
2507 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2508 libcfs_nid2str(lp->lp_primary_nid));
2510 spin_unlock(&lp->lp_lock);
2514 * Event handler for the discovery EQ.
2516 * Called with lnet_res_lock(cpt) held. The cpt is the
2517 * lnet_cpt_of_cookie() of the md handle cookie.
2519 static void lnet_discovery_event_handler(struct lnet_event *event)
2521 struct lnet_peer *lp = event->md_user_ptr;
2522 struct lnet_ping_buffer *pbuf;
2525 /* discovery needs to take another look */
2526 rc = LNET_REDISCOVER_PEER;
2528 CDEBUG(D_NET, "Received event: %d\n", event->type);
2530 switch (event->type) {
2531 case LNET_EVENT_ACK:
2532 lnet_discovery_event_ack(lp, event);
2534 case LNET_EVENT_REPLY:
2535 lnet_discovery_event_reply(lp, event);
2537 case LNET_EVENT_SEND:
2538 /* Only send failure triggers a retry. */
2539 rc = lnet_discovery_event_send(lp, event);
2541 case LNET_EVENT_UNLINK:
2542 /* LNetMDUnlink() was called */
2543 lnet_discovery_event_unlink(lp, event);
2546 /* Invalid events. */
2549 lnet_net_lock(LNET_LOCK_EX);
2550 if (event->unlinked) {
2551 pbuf = LNET_PING_INFO_TO_BUFFER(event->md_start);
2552 lnet_ping_buffer_decref(pbuf);
2553 lnet_peer_decref_locked(lp);
2556 /* put peer back at end of request queue, if discovery not already
2558 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2559 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2560 wake_up(&the_lnet.ln_dc_waitq);
2562 lnet_net_unlock(LNET_LOCK_EX);
2566 * Build a peer from incoming data.
2568 * The NIDs in the incoming data are supposed to be structured as follows:
2571 * - other NIDs in same net
2572 * - NIDs in second net
2573 * - NIDs in third net
2575 * This due to the way the list of NIDs in the data is created.
2577 * Note that this function will mark the peer uptodate unless an
2578 * ENOMEM is encontered. All other errors are due to a conflict
2579 * between the DLC configuration and what discovery sees. We treat DLC
2580 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2581 * peer from becoming stuck in discovery.
2583 static int lnet_peer_merge_data(struct lnet_peer *lp,
2584 struct lnet_ping_buffer *pbuf)
2586 struct lnet_peer_ni *lpni;
2587 lnet_nid_t *curnis = NULL;
2588 struct lnet_ni_status *addnis = NULL;
2589 lnet_nid_t *delnis = NULL;
2599 flags = LNET_PEER_DISCOVERED;
2600 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2601 flags |= LNET_PEER_MULTI_RAIL;
2604 * Cache the routing feature for the peer; whether it is enabled
2605 * for disabled as reported by the remote peer.
2607 spin_lock(&lp->lp_lock);
2608 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
2609 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
2611 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
2612 spin_unlock(&lp->lp_lock);
2614 nnis = max_t(int, lp->lp_nnis, pbuf->pb_info.pi_nnis);
2615 CFS_ALLOC_PTR_ARRAY(curnis, nnis);
2616 CFS_ALLOC_PTR_ARRAY(addnis, nnis);
2617 CFS_ALLOC_PTR_ARRAY(delnis, nnis);
2618 if (!curnis || !addnis || !delnis) {
2626 /* Construct the list of NIDs present in peer. */
2628 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2629 curnis[ncurnis++] = lpni->lpni_nid;
2632 * Check for NIDs in pbuf not present in curnis[].
2633 * The loop starts at 1 to skip the loopback NID.
2635 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2636 for (j = 0; j < ncurnis; j++)
2637 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2640 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
2643 * Check for NIDs in curnis[] not present in pbuf.
2644 * The nested loop starts at 1 to skip the loopback NID.
2646 * But never add the loopback NID to delnis[]: if it is
2647 * present in curnis[] then this peer is for this node.
2649 for (i = 0; i < ncurnis; i++) {
2650 if (curnis[i] == LNET_NID_LO_0)
2652 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
2653 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
2655 * update the information we cache for the
2656 * peer with the latest information we
2659 lpni = lnet_find_peer_ni_locked(curnis[i]);
2661 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
2662 lnet_peer_ni_decref_locked(lpni);
2667 if (j == pbuf->pb_info.pi_nnis)
2668 delnis[ndelnis++] = curnis[i];
2672 * If we get here and the discovery is disabled then we don't want
2673 * to add or delete any NIs. We just updated the ones we have some
2674 * information on, and call it a day
2677 if (lnet_is_discovery_disabled(lp))
2680 for (i = 0; i < naddnis; i++) {
2681 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
2683 CERROR("Error adding NID %s to peer %s: %d\n",
2684 libcfs_nid2str(addnis[i].ns_nid),
2685 libcfs_nid2str(lp->lp_primary_nid), rc);
2689 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
2691 lpni->lpni_ns_status = addnis[i].ns_status;
2692 lnet_peer_ni_decref_locked(lpni);
2696 for (i = 0; i < ndelnis; i++) {
2698 * for routers it's okay to delete the primary_nid because
2699 * the upper layers don't really rely on it. So if we're
2700 * being told that the router changed its primary_nid
2701 * then it's okay to delete it.
2703 if (lp->lp_rtr_refcount > 0)
2704 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
2705 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2707 CERROR("Error deleting NID %s from peer %s: %d\n",
2708 libcfs_nid2str(delnis[i]),
2709 libcfs_nid2str(lp->lp_primary_nid), rc);
2715 * Errors other than -ENOMEM are due to peers having been
2716 * configured with DLC. Ignore these because DLC overrides
2721 CFS_FREE_PTR_ARRAY(curnis, nnis);
2722 CFS_FREE_PTR_ARRAY(addnis, nnis);
2723 CFS_FREE_PTR_ARRAY(delnis, nnis);
2724 lnet_ping_buffer_decref(pbuf);
2725 CDEBUG(D_NET, "peer %s (%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
2728 spin_lock(&lp->lp_lock);
2729 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2730 lp->lp_state |= LNET_PEER_FORCE_PING;
2731 spin_unlock(&lp->lp_lock);
2737 * The data in pbuf says lp is its primary peer, but the data was
2738 * received by a different peer. Try to update lp with the data.
2741 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2743 struct lnet_handle_md mdh;
2745 /* Queue lp for discovery, and force it on the request queue. */
2746 lnet_net_lock(LNET_LOCK_EX);
2747 if (lnet_peer_queue_for_discovery(lp))
2748 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2749 lnet_net_unlock(LNET_LOCK_EX);
2751 LNetInvalidateMDHandle(&mdh);
2754 * Decide whether we can move the peer to the DATA_PRESENT state.
2756 * We replace stale data for a multi-rail peer, repair PING_FAILED
2757 * status, and preempt FORCE_PING.
2759 * If after that we have DATA_PRESENT, we merge it into this peer.
2761 spin_lock(&lp->lp_lock);
2762 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2763 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2764 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2765 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2766 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2767 lnet_ping_buffer_decref(pbuf);
2772 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2773 lnet_ping_buffer_decref(lp->lp_data);
2775 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2777 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2778 mdh = lp->lp_ping_mdh;
2779 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2780 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2781 lp->lp_ping_error = 0;
2783 if (lp->lp_state & LNET_PEER_FORCE_PING)
2784 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2785 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2786 spin_unlock(&lp->lp_lock);
2788 if (!LNetMDHandleIsInvalid(mdh))
2792 return lnet_peer_merge_data(lp, pbuf);
2794 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
2798 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
2802 for (i = 0; i < pinfo->pi_nnis; i++) {
2803 if (pinfo->pi_ni[i].ns_nid == nid)
2811 * Update a peer using the data received.
2813 static int lnet_peer_data_present(struct lnet_peer *lp)
2814 __must_hold(&lp->lp_lock)
2816 struct lnet_ping_buffer *pbuf;
2817 struct lnet_peer_ni *lpni;
2818 lnet_nid_t nid = LNET_NID_ANY;
2824 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2825 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2826 spin_unlock(&lp->lp_lock);
2829 * Modifications of peer structures are done while holding the
2830 * ln_api_mutex. A global lock is required because we may be
2831 * modifying multiple peer structures, and a mutex greatly
2832 * simplifies memory management.
2834 * The actual changes to the data structures must also protect
2835 * against concurrent lookups, for which the lnet_net_lock in
2836 * LNET_LOCK_EX mode is used.
2838 mutex_lock(&the_lnet.ln_api_mutex);
2839 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2845 * If this peer is not on the peer list then it is being torn
2846 * down, and our reference count may be all that is keeping it
2847 * alive. Don't do any work on it.
2849 if (list_empty(&lp->lp_peer_list))
2852 flags = LNET_PEER_DISCOVERED;
2853 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2854 flags |= LNET_PEER_MULTI_RAIL;
2857 * Check whether the primary NID in the message matches the
2858 * primary NID of the peer. If it does, update the peer, if
2859 * it it does not, check whether there is already a peer with
2860 * that primary NID. If no such peer exists, try to update
2861 * the primary NID of the current peer (allowed if it was
2862 * created due to message traffic) and complete the update.
2863 * If the peer did exist, hand off the data to it.
2865 * The peer for the loopback interface is a special case: this
2866 * is the peer for the local node, and we want to set its
2867 * primary NID to the correct value here. Moreover, this peer
2868 * can show up with only the loopback NID in the ping buffer.
2870 if (pbuf->pb_info.pi_nnis <= 1)
2872 nid = pbuf->pb_info.pi_ni[1].ns_nid;
2873 if (lp->lp_primary_nid == LNET_NID_LO_0) {
2874 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2876 rc = lnet_peer_merge_data(lp, pbuf);
2878 * if the primary nid of the peer is present in the ping info returned
2879 * from the peer, but it's not the local primary peer we have
2880 * cached and discovery is disabled, then we don't want to update
2881 * our local peer info, by adding or removing NIDs, we just want
2882 * to update the status of the nids that we currently have
2883 * recorded in that peer.
2885 } else if (lp->lp_primary_nid == nid ||
2886 (lnet_is_nid_in_ping_info(lp->lp_primary_nid, &pbuf->pb_info) &&
2887 lnet_is_discovery_disabled(lp))) {
2888 rc = lnet_peer_merge_data(lp, pbuf);
2890 lpni = lnet_find_peer_ni_locked(nid);
2892 rc = lnet_peer_set_primary_nid(lp, nid, flags);
2894 CERROR("Primary NID error %s versus %s: %d\n",
2895 libcfs_nid2str(lp->lp_primary_nid),
2896 libcfs_nid2str(nid), rc);
2898 rc = lnet_peer_merge_data(lp, pbuf);
2901 struct lnet_peer *new_lp;
2902 new_lp = lpni->lpni_peer_net->lpn_peer;
2904 * if lp has discovery/MR enabled that means new_lp
2905 * should have discovery/MR enabled as well, since
2906 * it's the same peer, which we're about to merge
2908 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
2909 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2910 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
2911 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
2913 rc = lnet_peer_set_primary_data(new_lp, pbuf);
2914 lnet_consolidate_routes_locked(lp, new_lp);
2915 lnet_peer_ni_decref_locked(lpni);
2919 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc,
2921 mutex_unlock(&the_lnet.ln_api_mutex);
2923 spin_lock(&lp->lp_lock);
2924 /* Tell discovery to re-check the peer immediately. */
2926 rc = LNET_REDISCOVER_PEER;
2931 * A ping failed. Clear the PING_FAILED state and set the
2932 * FORCE_PING state, to ensure a retry even if discovery is
2933 * disabled. This avoids being left with incorrect state.
2935 static int lnet_peer_ping_failed(struct lnet_peer *lp)
2936 __must_hold(&lp->lp_lock)
2938 struct lnet_handle_md mdh;
2941 mdh = lp->lp_ping_mdh;
2942 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2943 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2944 lp->lp_state |= LNET_PEER_FORCE_PING;
2945 rc = lp->lp_ping_error;
2946 lp->lp_ping_error = 0;
2947 spin_unlock(&lp->lp_lock);
2949 if (!LNetMDHandleIsInvalid(mdh))
2952 CDEBUG(D_NET, "peer %s:%d\n",
2953 libcfs_nid2str(lp->lp_primary_nid), rc);
2955 spin_lock(&lp->lp_lock);
2956 return rc ? rc : LNET_REDISCOVER_PEER;
2960 * Select NID to send a Ping or Push to.
2962 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
2964 struct lnet_peer_ni *lpni;
2966 /* Look for a direct-connected NID for this peer. */
2968 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2969 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
2974 return lpni->lpni_nid;
2976 /* Look for a routed-connected NID for this peer. */
2978 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
2979 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
2984 return lpni->lpni_nid;
2986 return LNET_NID_ANY;
2989 /* Active side of ping. */
2990 static int lnet_peer_send_ping(struct lnet_peer *lp)
2991 __must_hold(&lp->lp_lock)
2998 lp->lp_state |= LNET_PEER_PING_SENT;
2999 lp->lp_state &= ~LNET_PEER_FORCE_PING;
3000 spin_unlock(&lp->lp_lock);
3002 cpt = lnet_net_lock_current();
3003 /* Refcount for MD. */
3004 lnet_peer_addref_locked(lp);
3005 pnid = lnet_peer_select_nid(lp);
3006 lnet_net_unlock(cpt);
3008 nnis = max(lp->lp_data_nnis, LNET_INTERFACES_MIN);
3010 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
3011 the_lnet.ln_dc_handler, false);
3014 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3015 * refcount on the peer, otherwise LNetMDUnlink will be called
3016 * which will eventually do that.
3020 lnet_peer_decref_locked(lp);
3021 lnet_net_unlock(cpt);
3022 rc = -rc; /* change the rc to negative value */
3024 } else if (rc < 0) {
3028 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3030 spin_lock(&lp->lp_lock);
3034 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
3036 * The errors that get us here are considered hard errors and
3037 * cause Discovery to terminate. So we clear PING_SENT, but do
3038 * not set either PING_FAILED or FORCE_PING. In fact we need
3039 * to clear PING_FAILED, because the unlink event handler will
3040 * have set it if we called LNetMDUnlink() above.
3042 spin_lock(&lp->lp_lock);
3043 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3048 * This function exists because you cannot call LNetMDUnlink() from an
3051 static int lnet_peer_push_failed(struct lnet_peer *lp)
3052 __must_hold(&lp->lp_lock)
3054 struct lnet_handle_md mdh;
3057 mdh = lp->lp_push_mdh;
3058 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3059 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3060 rc = lp->lp_push_error;
3061 lp->lp_push_error = 0;
3062 spin_unlock(&lp->lp_lock);
3064 if (!LNetMDHandleIsInvalid(mdh))
3067 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3068 spin_lock(&lp->lp_lock);
3069 return rc ? rc : LNET_REDISCOVER_PEER;
3073 * Mark the peer as discovered.
3075 static int lnet_peer_discovered(struct lnet_peer *lp)
3076 __must_hold(&lp->lp_lock)
3078 lp->lp_state |= LNET_PEER_DISCOVERED;
3079 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3080 LNET_PEER_REDISCOVER);
3082 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3087 /* Active side of push. */
3088 static int lnet_peer_send_push(struct lnet_peer *lp)
3089 __must_hold(&lp->lp_lock)
3091 struct lnet_ping_buffer *pbuf;
3092 struct lnet_process_id id;
3097 /* Don't push to a non-multi-rail peer. */
3098 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3099 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3100 /* if peer's NIDs are uptodate then peer is discovered */
3101 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE) {
3102 rc = lnet_peer_discovered(lp);
3109 lp->lp_state |= LNET_PEER_PUSH_SENT;
3110 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3111 spin_unlock(&lp->lp_lock);
3113 cpt = lnet_net_lock_current();
3114 pbuf = the_lnet.ln_ping_target;
3115 lnet_ping_buffer_addref(pbuf);
3116 lnet_net_unlock(cpt);
3118 /* Push source MD */
3119 md.start = &pbuf->pb_info;
3120 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3121 md.threshold = 2; /* Put/Ack */
3123 md.options = LNET_MD_TRACK_RESPONSE;
3124 md.handler = the_lnet.ln_dc_handler;
3127 rc = LNetMDBind(&md, LNET_UNLINK, &lp->lp_push_mdh);
3129 lnet_ping_buffer_decref(pbuf);
3130 CERROR("Can't bind push source MD: %d\n", rc);
3133 cpt = lnet_net_lock_current();
3134 /* Refcount for MD. */
3135 lnet_peer_addref_locked(lp);
3136 id.pid = LNET_PID_LUSTRE;
3137 id.nid = lnet_peer_select_nid(lp);
3138 lnet_net_unlock(cpt);
3140 if (id.nid == LNET_NID_ANY) {
3145 rc = LNetPut(lp->lp_disc_src_nid, lp->lp_push_mdh,
3146 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3147 LNET_PROTO_PING_MATCHBITS, 0, 0);
3150 * reset the discovery nid. There is no need to restrict sending
3151 * from that source, if we call lnet_push_update_to_peers(). It'll
3152 * get set to a specific NID, if we initiate discovery from the
3155 lp->lp_disc_src_nid = LNET_NID_ANY;
3160 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3162 spin_lock(&lp->lp_lock);
3166 LNetMDUnlink(lp->lp_push_mdh);
3167 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3169 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
3171 * The errors that get us here are considered hard errors and
3172 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3173 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3174 * because the unlink event handler will have set it if we
3175 * called LNetMDUnlink() above.
3177 spin_lock(&lp->lp_lock);
3178 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3183 * An unrecoverable error was encountered during discovery.
3184 * Set error status in peer and abort discovery.
3186 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3188 CDEBUG(D_NET, "Discovery error %s: %d\n",
3189 libcfs_nid2str(lp->lp_primary_nid), error);
3191 spin_lock(&lp->lp_lock);
3192 lp->lp_dc_error = error;
3193 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3194 lp->lp_state |= LNET_PEER_REDISCOVER;
3195 spin_unlock(&lp->lp_lock);
3199 * Discovering this peer is taking too long. Cancel any Ping or Push
3200 * that discovery is waiting on by unlinking the relevant MDs. The
3201 * lnet_discovery_event_handler() will proceed from here and complete
3204 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
3206 struct lnet_handle_md ping_mdh;
3207 struct lnet_handle_md push_mdh;
3209 LNetInvalidateMDHandle(&ping_mdh);
3210 LNetInvalidateMDHandle(&push_mdh);
3212 spin_lock(&lp->lp_lock);
3213 if (lp->lp_state & LNET_PEER_PING_SENT) {
3214 ping_mdh = lp->lp_ping_mdh;
3215 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3217 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
3218 push_mdh = lp->lp_push_mdh;
3219 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3221 spin_unlock(&lp->lp_lock);
3223 if (!LNetMDHandleIsInvalid(ping_mdh))
3224 LNetMDUnlink(ping_mdh);
3225 if (!LNetMDHandleIsInvalid(push_mdh))
3226 LNetMDUnlink(push_mdh);
3230 * Wait for work to be queued or some other change that must be
3231 * attended to. Returns non-zero if the discovery thread should shut
3234 static int lnet_peer_discovery_wait_for_work(void)
3241 cpt = lnet_net_lock_current();
3243 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3244 TASK_INTERRUPTIBLE);
3245 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3247 if (lnet_push_target_resize_needed() ||
3248 the_lnet.ln_push_target->pb_needs_post)
3250 if (!list_empty(&the_lnet.ln_dc_request))
3252 if (!list_empty(&the_lnet.ln_msg_resend))
3254 lnet_net_unlock(cpt);
3257 * wakeup max every second to check if there are peers that
3258 * have been stuck on the working queue for greater than
3261 schedule_timeout(cfs_time_seconds(1));
3262 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3263 cpt = lnet_net_lock_current();
3265 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3267 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3270 lnet_net_unlock(cpt);
3272 CDEBUG(D_NET, "woken: %d\n", rc);
3278 * Messages that were pending on a destroyed peer will be put on a global
3279 * resend list. The message resend list will be checked by
3280 * the discovery thread when it wakes up, and will resend messages. These
3281 * messages can still be sendable in the case the lpni which was the initial
3282 * cause of the message re-queue was transfered to another peer.
3284 * It is possible that LNet could be shutdown while we're iterating
3285 * through the list. lnet_shudown_lndnets() will attempt to access the
3286 * resend list, but will have to wait until the spinlock is released, by
3287 * which time there shouldn't be any more messages on the resend list.
3288 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3289 * for the messages so they can be released. The other case is that
3290 * lnet_shudown_lndnets() can finalize all the messages before this
3291 * function can visit the resend list, in which case this function will be
3294 static void lnet_resend_msgs(void)
3296 struct lnet_msg *msg, *tmp;
3300 spin_lock(&the_lnet.ln_msg_resend_lock);
3301 list_splice(&the_lnet.ln_msg_resend, &resend);
3302 spin_unlock(&the_lnet.ln_msg_resend_lock);
3304 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3305 list_del_init(&msg->msg_list);
3306 rc = lnet_send(msg->msg_src_nid_param, msg,
3307 msg->msg_rtr_nid_param);
3309 CNETERR("Error sending %s to %s: %d\n",
3310 lnet_msgtyp2str(msg->msg_type),
3311 libcfs_id2str(msg->msg_target), rc);
3312 lnet_finalize(msg, rc);
3317 /* The discovery thread. */
3318 static int lnet_peer_discovery(void *arg)
3320 struct lnet_peer *lp;
3323 wait_for_completion(&the_lnet.ln_started);
3325 CDEBUG(D_NET, "started\n");
3328 if (lnet_peer_discovery_wait_for_work())
3331 if (lnet_push_target_resize_needed())
3332 lnet_push_target_resize();
3333 else if (the_lnet.ln_push_target->pb_needs_post)
3334 lnet_push_target_post(the_lnet.ln_push_target,
3335 &the_lnet.ln_push_target_md);
3339 lnet_net_lock(LNET_LOCK_EX);
3340 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING) {
3341 lnet_net_unlock(LNET_LOCK_EX);
3346 * Process all incoming discovery work requests. When
3347 * discovery must wait on a peer to change state, it
3348 * is added to the tail of the ln_dc_working queue. A
3349 * timestamp keeps track of when the peer was added,
3350 * so we can time out discovery requests that take too
3353 while (!list_empty(&the_lnet.ln_dc_request)) {
3354 lp = list_first_entry(&the_lnet.ln_dc_request,
3355 struct lnet_peer, lp_dc_list);
3356 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3358 * set the time the peer was put on the dc_working
3359 * queue. It shouldn't remain on the queue
3360 * forever, in case the GET message (for ping)
3361 * doesn't get a REPLY or the PUT message (for
3362 * push) doesn't get an ACK.
3364 lp->lp_last_queued = ktime_get_real_seconds();
3365 lnet_net_unlock(LNET_LOCK_EX);
3367 if (lnet_push_target_resize_needed())
3368 lnet_push_target_resize();
3369 else if (the_lnet.ln_push_target->pb_needs_post)
3370 lnet_push_target_post(the_lnet.ln_push_target,
3371 &the_lnet.ln_push_target_md);
3374 * Select an action depending on the state of
3375 * the peer and whether discovery is disabled.
3376 * The check whether discovery is disabled is
3377 * done after the code that handles processing
3378 * for arrived data, cleanup for failures, and
3379 * forcing a Ping or Push.
3381 spin_lock(&lp->lp_lock);
3382 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3383 libcfs_nid2str(lp->lp_primary_nid), lp,
3385 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3386 rc = lnet_peer_data_present(lp);
3387 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3388 rc = lnet_peer_ping_failed(lp);
3389 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3390 rc = lnet_peer_push_failed(lp);
3391 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3392 rc = lnet_peer_send_ping(lp);
3393 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3394 rc = lnet_peer_send_push(lp);
3395 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3396 rc = lnet_peer_send_ping(lp);
3397 else if (lnet_peer_needs_push(lp))
3398 rc = lnet_peer_send_push(lp);
3400 rc = lnet_peer_discovered(lp);
3401 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3402 libcfs_nid2str(lp->lp_primary_nid), lp,
3404 spin_unlock(&lp->lp_lock);
3406 lnet_net_lock(LNET_LOCK_EX);
3407 if (rc == LNET_REDISCOVER_PEER) {
3408 list_move(&lp->lp_dc_list,
3409 &the_lnet.ln_dc_request);
3411 lnet_peer_discovery_error(lp, rc);
3413 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3414 lnet_peer_discovery_complete(lp);
3415 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3418 if (lp->lp_state & LNET_PEER_MARK_DELETION) {
3419 struct list_head rlist;
3420 struct lnet_route *route, *tmp;
3421 int sensitivity = lp->lp_health_sensitivity;
3423 INIT_LIST_HEAD(&rlist);
3426 * remove the peer from the discovery work
3427 * queue if it's on there in preparation
3430 if (!list_empty(&lp->lp_dc_list))
3431 list_del(&lp->lp_dc_list);
3433 lnet_net_unlock(LNET_LOCK_EX);
3435 mutex_lock(&the_lnet.ln_api_mutex);
3437 lnet_net_lock(LNET_LOCK_EX);
3438 list_for_each_entry_safe(route, tmp,
3441 lnet_move_route(route, NULL, &rlist);
3442 lnet_net_unlock(LNET_LOCK_EX);
3444 /* delete the peer */
3447 list_for_each_entry_safe(route, tmp,
3449 /* re-add these routes */
3450 lnet_add_route(route->lr_net,
3455 LIBCFS_FREE(route, sizeof(*route));
3457 mutex_unlock(&the_lnet.ln_api_mutex);
3459 lnet_net_lock(LNET_LOCK_EX);
3463 lnet_net_unlock(LNET_LOCK_EX);
3466 CDEBUG(D_NET, "stopping\n");
3468 * Clean up before telling lnet_peer_discovery_stop() that
3469 * we're done. Use wake_up() below to somewhat reduce the
3470 * size of the thundering herd if there are multiple threads
3471 * waiting on discovery of a single peer.
3474 /* Queue cleanup 1: stop all pending pings and pushes. */
3475 lnet_net_lock(LNET_LOCK_EX);
3476 while (!list_empty(&the_lnet.ln_dc_working)) {
3477 lp = list_first_entry(&the_lnet.ln_dc_working,
3478 struct lnet_peer, lp_dc_list);
3479 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3480 lnet_net_unlock(LNET_LOCK_EX);
3481 lnet_peer_cancel_discovery(lp);
3482 lnet_net_lock(LNET_LOCK_EX);
3484 lnet_net_unlock(LNET_LOCK_EX);
3486 /* Queue cleanup 2: wait for the expired queue to clear. */
3487 while (!list_empty(&the_lnet.ln_dc_expired))
3488 schedule_timeout_uninterruptible(cfs_time_seconds(1));
3490 /* Queue cleanup 3: clear the request queue. */
3491 lnet_net_lock(LNET_LOCK_EX);
3492 while (!list_empty(&the_lnet.ln_dc_request)) {
3493 lp = list_first_entry(&the_lnet.ln_dc_request,
3494 struct lnet_peer, lp_dc_list);
3495 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3496 lnet_peer_discovery_complete(lp);
3498 lnet_net_unlock(LNET_LOCK_EX);
3500 lnet_assert_handler_unused(the_lnet.ln_dc_handler);
3501 the_lnet.ln_dc_handler = NULL;
3503 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3504 wake_up(&the_lnet.ln_dc_waitq);
3506 CDEBUG(D_NET, "stopped\n");
3511 /* ln_api_mutex is held on entry. */
3512 int lnet_peer_discovery_start(void)
3514 struct task_struct *task;
3517 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3520 the_lnet.ln_dc_handler = lnet_discovery_event_handler;
3521 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3522 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3525 CERROR("Can't start peer discovery thread: %d\n", rc);
3527 the_lnet.ln_dc_handler = NULL;
3529 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3532 CDEBUG(D_NET, "discovery start: %d\n", rc);
3537 /* ln_api_mutex is held on entry. */
3538 void lnet_peer_discovery_stop(void)
3540 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3543 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3544 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3546 /* In the LNetNIInit() path we may be stopping discovery before it
3547 * entered its work loop
3549 if (!completion_done(&the_lnet.ln_started))
3550 complete(&the_lnet.ln_started);
3552 wake_up(&the_lnet.ln_dc_waitq);
3554 wait_event(the_lnet.ln_dc_waitq,
3555 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3557 LASSERT(list_empty(&the_lnet.ln_dc_request));
3558 LASSERT(list_empty(&the_lnet.ln_dc_working));
3559 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3561 CDEBUG(D_NET, "discovery stopped\n");
3567 lnet_debug_peer(lnet_nid_t nid)
3569 char *aliveness = "NA";
3570 struct lnet_peer_ni *lp;
3573 cpt = lnet_cpt_of_nid(nid, NULL);
3576 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3578 lnet_net_unlock(cpt);
3579 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3583 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3584 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3586 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3587 libcfs_nid2str(lp->lpni_nid), atomic_read(&lp->lpni_refcount),
3588 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3589 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3590 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3592 lnet_peer_ni_decref_locked(lp);
3594 lnet_net_unlock(cpt);
3597 /* Gathering information for userspace. */
3599 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3600 char aliveness[LNET_MAX_STR_LEN],
3601 __u32 *cpt_iter, __u32 *refcount,
3602 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3603 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3604 __u32 *peer_tx_qnob)
3606 struct lnet_peer_table *peer_table;
3607 struct lnet_peer_ni *lp;
3612 /* get the number of CPTs */
3613 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3615 /* if the cpt number to be examined is >= the number of cpts in
3616 * the system then indicate that there are no more cpts to examin
3618 if (*cpt_iter >= lncpt)
3621 /* get the current table */
3622 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3623 /* if the ptable is NULL then there are no more cpts to examine */
3624 if (peer_table == NULL)
3627 lnet_net_lock(*cpt_iter);
3629 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3630 struct list_head *peers = &peer_table->pt_hash[j];
3632 list_for_each_entry(lp, peers, lpni_hashlist) {
3633 if (peer_index-- > 0)
3636 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3637 if (lnet_isrouter(lp) ||
3638 lnet_peer_aliveness_enabled(lp))
3639 snprintf(aliveness, LNET_MAX_STR_LEN,
3640 lnet_is_peer_ni_alive(lp) ? "up" : "down");
3642 *nid = lp->lpni_nid;
3643 *refcount = atomic_read(&lp->lpni_refcount);
3644 *ni_peer_tx_credits =
3645 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3646 *peer_tx_credits = lp->lpni_txcredits;
3647 *peer_rtr_credits = lp->lpni_rtrcredits;
3648 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3649 *peer_tx_qnob = lp->lpni_txqnob;
3655 lnet_net_unlock(*cpt_iter);
3659 return found ? 0 : -ENOENT;
3662 /* ln_api_mutex is held, which keeps the peer list stable */
3663 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3665 struct lnet_ioctl_element_stats *lpni_stats;
3666 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3667 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3668 struct lnet_peer_ni_credit_info *lpni_info;
3669 struct lnet_peer_ni *lpni;
3670 struct lnet_peer *lp;
3675 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3682 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3683 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3684 size *= lp->lp_nnis;
3685 if (size > cfg->prcfg_size) {
3686 cfg->prcfg_size = size;
3691 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3692 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3693 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3694 cfg->prcfg_count = lp->lp_nnis;
3695 cfg->prcfg_size = size;
3696 cfg->prcfg_state = lp->lp_state;
3698 /* Allocate helper buffers. */
3700 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3703 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3706 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3707 if (!lpni_msg_stats)
3708 goto out_free_stats;
3709 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3711 goto out_free_msg_stats;
3716 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3717 nid = lpni->lpni_nid;
3718 if (copy_to_user(bulk, &nid, sizeof(nid)))
3719 goto out_free_hstats;
3720 bulk += sizeof(nid);
3722 memset(lpni_info, 0, sizeof(*lpni_info));
3723 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3724 if (lnet_isrouter(lpni) ||
3725 lnet_peer_aliveness_enabled(lpni))
3726 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3727 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
3729 lpni_info->cr_refcount = atomic_read(&lpni->lpni_refcount);
3730 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3731 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3732 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3733 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3734 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3735 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3736 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3737 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3738 goto out_free_hstats;
3739 bulk += sizeof(*lpni_info);
3741 memset(lpni_stats, 0, sizeof(*lpni_stats));
3742 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3743 LNET_STATS_TYPE_SEND);
3744 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3745 LNET_STATS_TYPE_RECV);
3746 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3747 LNET_STATS_TYPE_DROP);
3748 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3749 goto out_free_hstats;
3750 bulk += sizeof(*lpni_stats);
3751 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3752 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3753 goto out_free_hstats;
3754 bulk += sizeof(*lpni_msg_stats);
3755 lpni_hstats->hlpni_network_timeout =
3756 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3757 lpni_hstats->hlpni_remote_dropped =
3758 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3759 lpni_hstats->hlpni_remote_timeout =
3760 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3761 lpni_hstats->hlpni_remote_error =
3762 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3763 lpni_hstats->hlpni_health_value =
3764 atomic_read(&lpni->lpni_healthv);
3765 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3766 goto out_free_hstats;
3767 bulk += sizeof(*lpni_hstats);
3772 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3774 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3776 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3778 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
3780 lnet_peer_decref_locked(lp);
3786 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni)
3788 /* the mt could've shutdown and cleaned up the queues */
3789 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
3792 if (list_empty(&lpni->lpni_recovery) &&
3793 atomic_read(&lpni->lpni_healthv) < LNET_MAX_HEALTH_VALUE) {
3794 CDEBUG(D_NET, "lpni %s added to recovery queue. Health = %d\n",
3795 libcfs_nid2str(lpni->lpni_nid),
3796 atomic_read(&lpni->lpni_healthv));
3797 list_add_tail(&lpni->lpni_recovery, &the_lnet.ln_mt_peerNIRecovq);
3798 lnet_peer_ni_addref_locked(lpni);
3802 /* Call with the ln_api_mutex held */
3804 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3806 struct lnet_peer_table *ptable;
3807 struct lnet_peer *lp;
3808 struct lnet_peer_net *lpn;
3809 struct lnet_peer_ni *lpni;
3813 if (the_lnet.ln_state != LNET_STATE_RUNNING)
3817 lnet_net_lock(LNET_LOCK_EX);
3818 lpni = lnet_find_peer_ni_locked(nid);
3820 lnet_net_unlock(LNET_LOCK_EX);
3823 atomic_set(&lpni->lpni_healthv, value);
3824 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3825 lnet_peer_ni_decref_locked(lpni);
3826 lnet_net_unlock(LNET_LOCK_EX);
3830 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3833 * Walk all the peers and reset the healhv for each one to the
3836 lnet_net_lock(LNET_LOCK_EX);
3837 for (cpt = 0; cpt < lncpt; cpt++) {
3838 ptable = the_lnet.ln_peer_tables[cpt];
3839 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
3840 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
3841 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
3843 atomic_set(&lpni->lpni_healthv, value);
3844 lnet_peer_ni_add_to_recoveryq_locked(lpni);
3849 lnet_net_unlock(LNET_LOCK_EX);