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/udsp.h>
44 #include <lnet/lib-lnet.h>
45 #include <uapi/linux/lnet/lnet-dlc.h>
47 /* Value indicating that recovery needs to re-check a peer immediately. */
48 #define LNET_REDISCOVER_PEER (1)
50 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp);
53 lnet_peer_remove_from_remote_list(struct lnet_peer_ni *lpni)
55 if (!list_empty(&lpni->lpni_on_remote_peer_ni_list)) {
56 list_del_init(&lpni->lpni_on_remote_peer_ni_list);
57 lnet_peer_ni_decref_locked(lpni);
62 lnet_peer_net_added(struct lnet_net *net)
64 struct lnet_peer_ni *lpni, *tmp;
66 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
67 lpni_on_remote_peer_ni_list) {
69 if (LNET_NIDNET(lpni->lpni_nid) == net->net_id) {
72 spin_lock(&lpni->lpni_lock);
73 lpni->lpni_txcredits =
74 lpni->lpni_net->net_tunables.lct_peer_tx_credits;
75 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
76 lpni->lpni_rtrcredits =
77 lnet_peer_buffer_credits(lpni->lpni_net);
78 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
79 spin_unlock(&lpni->lpni_lock);
81 lnet_peer_remove_from_remote_list(lpni);
87 lnet_peer_tables_destroy(void)
89 struct lnet_peer_table *ptable;
90 struct list_head *hash;
94 if (!the_lnet.ln_peer_tables)
97 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
98 hash = ptable->pt_hash;
99 if (!hash) /* not intialized */
102 LASSERT(list_empty(&ptable->pt_zombie_list));
104 ptable->pt_hash = NULL;
105 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
106 LASSERT(list_empty(&hash[j]));
108 CFS_FREE_PTR_ARRAY(hash, LNET_PEER_HASH_SIZE);
111 cfs_percpt_free(the_lnet.ln_peer_tables);
112 the_lnet.ln_peer_tables = NULL;
116 lnet_peer_tables_create(void)
118 struct lnet_peer_table *ptable;
119 struct list_head *hash;
123 the_lnet.ln_peer_tables = cfs_percpt_alloc(lnet_cpt_table(),
125 if (the_lnet.ln_peer_tables == NULL) {
126 CERROR("Failed to allocate cpu-partition peer tables\n");
130 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
131 LIBCFS_CPT_ALLOC(hash, lnet_cpt_table(), i,
132 LNET_PEER_HASH_SIZE * sizeof(*hash));
134 CERROR("Failed to create peer hash table\n");
135 lnet_peer_tables_destroy();
139 spin_lock_init(&ptable->pt_zombie_lock);
140 INIT_LIST_HEAD(&ptable->pt_zombie_list);
142 INIT_LIST_HEAD(&ptable->pt_peer_list);
144 for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
145 INIT_LIST_HEAD(&hash[j]);
146 ptable->pt_hash = hash; /* sign of initialization */
152 static struct lnet_peer_ni *
153 lnet_peer_ni_alloc(lnet_nid_t nid)
155 struct lnet_peer_ni *lpni;
156 struct lnet_net *net;
159 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
161 LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt, sizeof(*lpni));
165 INIT_LIST_HEAD(&lpni->lpni_txq);
166 INIT_LIST_HEAD(&lpni->lpni_hashlist);
167 INIT_LIST_HEAD(&lpni->lpni_peer_nis);
168 INIT_LIST_HEAD(&lpni->lpni_recovery);
169 INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
170 INIT_LIST_HEAD(&lpni->lpni_rtr_pref_nids);
171 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
172 kref_init(&lpni->lpni_kref);
173 lpni->lpni_sel_priority = LNET_MAX_SELECTION_PRIORITY;
175 spin_lock_init(&lpni->lpni_lock);
177 if (lnet_peers_start_down())
178 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
180 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
181 lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
182 lpni->lpni_nid = nid;
183 lpni->lpni_cpt = cpt;
184 atomic_set(&lpni->lpni_healthv, LNET_MAX_HEALTH_VALUE);
186 net = lnet_get_net_locked(LNET_NIDNET(nid));
187 lpni->lpni_net = net;
189 lpni->lpni_txcredits = net->net_tunables.lct_peer_tx_credits;
190 lpni->lpni_mintxcredits = lpni->lpni_txcredits;
191 lpni->lpni_rtrcredits = lnet_peer_buffer_credits(net);
192 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
195 * This peer_ni is not on a local network, so we
196 * cannot add the credits here. In case the net is
197 * added later, add the peer_ni to the remote peer ni
198 * list so it can be easily found and revisited.
200 /* FIXME: per-net implementation instead? */
201 lnet_peer_ni_addref_locked(lpni);
202 list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
203 &the_lnet.ln_remote_peer_ni_list);
206 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
211 static struct lnet_peer_net *
212 lnet_peer_net_alloc(__u32 net_id)
214 struct lnet_peer_net *lpn;
216 LIBCFS_CPT_ALLOC(lpn, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lpn));
220 INIT_LIST_HEAD(&lpn->lpn_peer_nets);
221 INIT_LIST_HEAD(&lpn->lpn_peer_nis);
222 lpn->lpn_net_id = net_id;
223 lpn->lpn_sel_priority = LNET_MAX_SELECTION_PRIORITY;
225 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
231 lnet_destroy_peer_net_locked(struct lnet_peer_net *lpn)
233 struct lnet_peer *lp;
235 CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
237 LASSERT(atomic_read(&lpn->lpn_refcount) == 0);
238 LASSERT(list_empty(&lpn->lpn_peer_nis));
239 LASSERT(list_empty(&lpn->lpn_peer_nets));
241 lpn->lpn_peer = NULL;
242 LIBCFS_FREE(lpn, sizeof(*lpn));
244 lnet_peer_decref_locked(lp);
247 static struct lnet_peer *
248 lnet_peer_alloc(lnet_nid_t nid)
250 struct lnet_peer *lp;
252 LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lp));
256 INIT_LIST_HEAD(&lp->lp_rtrq);
257 INIT_LIST_HEAD(&lp->lp_routes);
258 INIT_LIST_HEAD(&lp->lp_peer_list);
259 INIT_LIST_HEAD(&lp->lp_peer_nets);
260 INIT_LIST_HEAD(&lp->lp_dc_list);
261 INIT_LIST_HEAD(&lp->lp_dc_pendq);
262 INIT_LIST_HEAD(&lp->lp_rtr_list);
263 init_waitqueue_head(&lp->lp_dc_waitq);
264 spin_lock_init(&lp->lp_lock);
265 lp->lp_primary_nid = nid;
266 lp->lp_disc_src_nid = LNET_NID_ANY;
267 if (lnet_peers_start_down())
268 lp->lp_alive = false;
273 * all peers created on a router should have health on
274 * if it's not already on.
276 if (the_lnet.ln_routing && !lnet_health_sensitivity)
277 lp->lp_health_sensitivity = 1;
280 * Turn off discovery for loopback peer. If you're creating a peer
281 * for the loopback interface then that was initiated when we
282 * attempted to send a message over the loopback. There is no need
283 * to ever use a different interface when sending messages to
286 if (nid == LNET_NID_LO_0)
287 lp->lp_state = LNET_PEER_NO_DISCOVERY;
288 lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
290 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
296 lnet_destroy_peer_locked(struct lnet_peer *lp)
298 CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nid2str(lp->lp_primary_nid));
300 LASSERT(atomic_read(&lp->lp_refcount) == 0);
301 LASSERT(lp->lp_rtr_refcount == 0);
302 LASSERT(list_empty(&lp->lp_peer_nets));
303 LASSERT(list_empty(&lp->lp_peer_list));
304 LASSERT(list_empty(&lp->lp_dc_list));
307 lnet_ping_buffer_decref(lp->lp_data);
310 * if there are messages still on the pending queue, then make
311 * sure to queue them on the ln_msg_resend list so they can be
312 * resent at a later point if the discovery thread is still
314 * If the discovery thread has stopped, then the wakeup will be a
315 * no-op, and it is expected the lnet_shutdown_lndnets() will
316 * eventually be called, which will traverse this list and
317 * finalize the messages on the list.
318 * We can not resend them now because we're holding the cpt lock.
319 * Releasing the lock can cause an inconsistent state
321 spin_lock(&the_lnet.ln_msg_resend_lock);
322 spin_lock(&lp->lp_lock);
323 list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
324 spin_unlock(&lp->lp_lock);
325 spin_unlock(&the_lnet.ln_msg_resend_lock);
326 wake_up(&the_lnet.ln_dc_waitq);
328 LIBCFS_FREE(lp, sizeof(*lp));
332 * Detach a peer_ni from its peer_net. If this was the last peer_ni on
333 * that peer_net, detach the peer_net from the peer.
335 * Call with lnet_net_lock/EX held
338 lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
340 struct lnet_peer_table *ptable;
341 struct lnet_peer_net *lpn;
342 struct lnet_peer *lp;
345 * Belts and suspenders: gracefully handle teardown of a
346 * partially connected peer_ni.
348 lpn = lpni->lpni_peer_net;
350 list_del_init(&lpni->lpni_peer_nis);
352 * If there are no lpni's left, we detach lpn from
353 * lp_peer_nets, so it cannot be found anymore.
355 if (list_empty(&lpn->lpn_peer_nis))
356 list_del_init(&lpn->lpn_peer_nets);
358 /* Update peer NID count. */
363 * If there are no more peer nets, make the peer unfindable
364 * via the peer_tables.
366 * Otherwise, if the peer is DISCOVERED, tell discovery to
367 * take another look at it. This is a no-op if discovery for
368 * this peer did the detaching.
370 if (list_empty(&lp->lp_peer_nets)) {
371 list_del_init(&lp->lp_peer_list);
372 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
374 } else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
375 /* Discovery isn't running, nothing to do here. */
376 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
377 lnet_peer_queue_for_discovery(lp);
378 wake_up(&the_lnet.ln_dc_waitq);
380 CDEBUG(D_NET, "peer %s NID %s\n",
381 libcfs_nid2str(lp->lp_primary_nid),
382 libcfs_nid2str(lpni->lpni_nid));
385 /* called with lnet_net_lock LNET_LOCK_EX held */
387 lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni, bool force)
389 struct lnet_peer_table *ptable = NULL;
391 /* don't remove a peer_ni if it's also a gateway */
392 if (lnet_isrouter(lpni) && !force) {
393 CERROR("Peer NI %s is a gateway. Can not delete it\n",
394 libcfs_nid2str(lpni->lpni_nid));
398 lnet_peer_remove_from_remote_list(lpni);
400 /* remove peer ni from the hash list. */
401 list_del_init(&lpni->lpni_hashlist);
404 * indicate the peer is being deleted so the monitor thread can
405 * remove it from the recovery queue.
407 spin_lock(&lpni->lpni_lock);
408 lpni->lpni_state |= LNET_PEER_NI_DELETING;
409 spin_unlock(&lpni->lpni_lock);
411 /* decrement the ref count on the peer table */
412 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
415 * The peer_ni can no longer be found with a lookup. But there
416 * can be current users, so keep track of it on the zombie
417 * list until the reference count has gone to zero.
419 * The last reference may be lost in a place where the
420 * lnet_net_lock locks only a single cpt, and that cpt may not
421 * be lpni->lpni_cpt. So the zombie list of lnet_peer_table
424 spin_lock(&ptable->pt_zombie_lock);
425 list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
426 ptable->pt_zombies++;
427 spin_unlock(&ptable->pt_zombie_lock);
429 /* no need to keep this peer_ni on the hierarchy anymore */
430 lnet_peer_detach_peer_ni_locked(lpni);
432 /* remove hashlist reference on peer_ni */
433 lnet_peer_ni_decref_locked(lpni);
438 void lnet_peer_uninit(void)
440 struct lnet_peer_ni *lpni, *tmp;
442 lnet_net_lock(LNET_LOCK_EX);
444 /* remove all peer_nis from the remote peer and the hash list */
445 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
446 lpni_on_remote_peer_ni_list)
447 lnet_peer_ni_del_locked(lpni, false);
449 lnet_peer_tables_destroy();
451 lnet_net_unlock(LNET_LOCK_EX);
455 lnet_peer_del_locked(struct lnet_peer *peer)
457 struct lnet_peer_ni *lpni = NULL, *lpni2;
460 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(peer->lp_primary_nid));
462 spin_lock(&peer->lp_lock);
463 peer->lp_state |= LNET_PEER_MARK_DELETED;
464 spin_unlock(&peer->lp_lock);
466 lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
467 while (lpni != NULL) {
468 lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
469 rc = lnet_peer_ni_del_locked(lpni, false);
479 * Discovering this peer is taking too long. Cancel any Ping or Push
480 * that discovery is waiting on by unlinking the relevant MDs. The
481 * lnet_discovery_event_handler() will proceed from here and complete
484 static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
486 struct lnet_handle_md ping_mdh;
487 struct lnet_handle_md push_mdh;
489 LNetInvalidateMDHandle(&ping_mdh);
490 LNetInvalidateMDHandle(&push_mdh);
492 spin_lock(&lp->lp_lock);
493 if (lp->lp_state & LNET_PEER_PING_SENT) {
494 ping_mdh = lp->lp_ping_mdh;
495 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
497 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
498 push_mdh = lp->lp_push_mdh;
499 LNetInvalidateMDHandle(&lp->lp_push_mdh);
501 spin_unlock(&lp->lp_lock);
503 if (!LNetMDHandleIsInvalid(ping_mdh))
504 LNetMDUnlink(ping_mdh);
505 if (!LNetMDHandleIsInvalid(push_mdh))
506 LNetMDUnlink(push_mdh);
510 lnet_peer_del(struct lnet_peer *peer)
512 lnet_peer_cancel_discovery(peer);
513 lnet_net_lock(LNET_LOCK_EX);
514 lnet_peer_del_locked(peer);
515 lnet_net_unlock(LNET_LOCK_EX);
521 * Delete a NID from a peer. Call with ln_api_mutex held.
524 * -EPERM: Non-DLC deletion from DLC-configured peer.
525 * -ENOENT: No lnet_peer_ni corresponding to the nid.
526 * -ECHILD: The lnet_peer_ni isn't connected to the peer.
527 * -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
530 lnet_peer_del_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
532 struct lnet_peer_ni *lpni;
533 lnet_nid_t primary_nid = lp->lp_primary_nid;
535 bool force = (flags & LNET_PEER_RTR_NI_FORCE_DEL) ? true : false;
537 if (!(flags & LNET_PEER_CONFIGURED)) {
538 if (lp->lp_state & LNET_PEER_CONFIGURED) {
543 lpni = lnet_find_peer_ni_locked(nid);
548 lnet_peer_ni_decref_locked(lpni);
549 if (lp != lpni->lpni_peer_net->lpn_peer) {
555 * This function only allows deletion of the primary NID if it
558 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && !force) {
563 lnet_net_lock(LNET_LOCK_EX);
565 if (nid == lp->lp_primary_nid && lp->lp_nnis != 1 && force) {
566 struct lnet_peer_ni *lpni2;
567 /* assign the next peer_ni to be the primary */
568 lpni2 = lnet_get_next_peer_ni_locked(lp, NULL, lpni);
570 lp->lp_primary_nid = lpni2->lpni_nid;
572 rc = lnet_peer_ni_del_locked(lpni, force);
574 lnet_net_unlock(LNET_LOCK_EX);
577 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
578 libcfs_nid2str(primary_nid), libcfs_nid2str(nid), flags, rc);
584 lnet_peer_table_cleanup_locked(struct lnet_net *net,
585 struct lnet_peer_table *ptable)
588 struct lnet_peer_ni *next;
589 struct lnet_peer_ni *lpni;
590 struct lnet_peer *peer;
592 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
593 list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
595 if (net != NULL && net != lpni->lpni_net)
598 peer = lpni->lpni_peer_net->lpn_peer;
599 if (peer->lp_primary_nid != lpni->lpni_nid) {
600 lnet_peer_ni_del_locked(lpni, false);
604 * Removing the primary NID implies removing
605 * the entire peer. Advance next beyond any
606 * peer_ni that belongs to the same peer.
608 list_for_each_entry_from(next, &ptable->pt_hash[i],
610 if (next->lpni_peer_net->lpn_peer != peer)
613 lnet_peer_del_locked(peer);
619 lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
621 wait_var_event_warning(&ptable->pt_zombies,
622 ptable->pt_zombies == 0,
623 "Waiting for %d zombies on peer table\n",
628 lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
629 struct lnet_peer_table *ptable)
631 struct lnet_peer_ni *lp;
632 struct lnet_peer_ni *tmp;
636 for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
637 list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
639 if (net != lp->lpni_net)
642 if (!lnet_isrouter(lp))
645 gw_nid = lp->lpni_peer_net->lpn_peer->lp_primary_nid;
647 lnet_net_unlock(LNET_LOCK_EX);
648 lnet_del_route(LNET_NET_ANY, gw_nid);
649 lnet_net_lock(LNET_LOCK_EX);
655 lnet_peer_tables_cleanup(struct lnet_net *net)
658 struct lnet_peer_table *ptable;
660 LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
661 /* If just deleting the peers for a NI, get rid of any routes these
662 * peers are gateways for. */
663 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
664 lnet_net_lock(LNET_LOCK_EX);
665 lnet_peer_table_del_rtrs_locked(net, ptable);
666 lnet_net_unlock(LNET_LOCK_EX);
669 /* Start the cleanup process */
670 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
671 lnet_net_lock(LNET_LOCK_EX);
672 lnet_peer_table_cleanup_locked(net, ptable);
673 lnet_net_unlock(LNET_LOCK_EX);
676 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
677 lnet_peer_ni_finalize_wait(ptable);
680 static struct lnet_peer_ni *
681 lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
683 struct list_head *peers;
684 struct lnet_peer_ni *lp;
686 if (the_lnet.ln_state != LNET_STATE_RUNNING)
689 peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
690 list_for_each_entry(lp, peers, lpni_hashlist) {
691 if (lp->lpni_nid == nid) {
692 lnet_peer_ni_addref_locked(lp);
700 struct lnet_peer_ni *
701 lnet_find_peer_ni_locked(lnet_nid_t nid)
703 struct lnet_peer_ni *lpni;
704 struct lnet_peer_table *ptable;
707 cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
709 ptable = the_lnet.ln_peer_tables[cpt];
710 lpni = lnet_get_peer_ni_locked(ptable, nid);
715 struct lnet_peer_ni *
716 lnet_peer_get_ni_locked(struct lnet_peer *lp, lnet_nid_t nid)
718 struct lnet_peer_net *lpn;
719 struct lnet_peer_ni *lpni;
721 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
725 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
726 if (lpni->lpni_nid == nid)
734 lnet_find_peer(lnet_nid_t nid)
736 struct lnet_peer_ni *lpni;
737 struct lnet_peer *lp = NULL;
740 cpt = lnet_net_lock_current();
741 lpni = lnet_find_peer_ni_locked(nid);
743 lp = lpni->lpni_peer_net->lpn_peer;
744 lnet_peer_addref_locked(lp);
745 lnet_peer_ni_decref_locked(lpni);
747 lnet_net_unlock(cpt);
752 struct lnet_peer_net *
753 lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
755 struct lnet_peer_net *net;
758 /* no net id provided return the first net */
759 net = list_first_entry_or_null(&lp->lp_peer_nets,
760 struct lnet_peer_net,
766 /* find the net after the one provided */
767 list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
768 if (net->lpn_net_id == prev_lpn_id) {
770 * if we reached the end of the list loop to the
773 if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
774 return list_first_entry_or_null(&lp->lp_peer_nets,
775 struct lnet_peer_net,
778 return list_next_entry(net, lpn_peer_nets);
785 struct lnet_peer_ni *
786 lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
787 struct lnet_peer_net *peer_net,
788 struct lnet_peer_ni *prev)
790 struct lnet_peer_ni *lpni;
791 struct lnet_peer_net *net = peer_net;
795 if (list_empty(&peer->lp_peer_nets))
798 net = list_entry(peer->lp_peer_nets.next,
799 struct lnet_peer_net,
802 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
808 if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
810 * if you reached the end of the peer ni list and the peer
811 * net is specified then there are no more peer nis in that
818 * we reached the end of this net ni list. move to the
821 if (prev->lpni_peer_net->lpn_peer_nets.next ==
823 /* no more nets and no more NIs. */
826 /* get the next net */
827 net = list_entry(prev->lpni_peer_net->lpn_peer_nets.next,
828 struct lnet_peer_net,
830 /* get the ni on it */
831 lpni = list_entry(net->lpn_peer_nis.next, struct lnet_peer_ni,
837 /* there are more nis left */
838 lpni = list_entry(prev->lpni_peer_nis.next,
839 struct lnet_peer_ni, lpni_peer_nis);
844 /* Call with the ln_api_mutex held */
845 int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
847 struct lnet_process_id id;
848 struct lnet_peer_table *ptable;
849 struct lnet_peer *lp;
858 if (the_lnet.ln_state != LNET_STATE_RUNNING)
861 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
864 * Count the number of peers, and return E2BIG if the buffer
865 * is too small. We'll also return the desired size.
868 for (cpt = 0; cpt < lncpt; cpt++) {
869 ptable = the_lnet.ln_peer_tables[cpt];
870 count += ptable->pt_peers;
872 size = count * sizeof(*ids);
877 * Walk the peer lists and copy out the primary nids.
878 * This is safe because the peer lists are only modified
879 * while the ln_api_mutex is held. So we don't need to
880 * hold the lnet_net_lock as well, and can therefore
881 * directly call copy_to_user().
884 memset(&id, 0, sizeof(id));
885 id.pid = LNET_PID_LUSTRE;
887 for (cpt = 0; cpt < lncpt; cpt++) {
888 ptable = the_lnet.ln_peer_tables[cpt];
889 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
892 id.nid = lp->lp_primary_nid;
893 if (copy_to_user(&ids[i], &id, sizeof(id)))
906 * Start pushes to peers that need to be updated for a configuration
907 * change on this node.
910 lnet_push_update_to_peers(int force)
912 struct lnet_peer_table *ptable;
913 struct lnet_peer *lp;
917 lnet_net_lock(LNET_LOCK_EX);
918 if (lnet_peer_discovery_disabled)
920 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
921 for (cpt = 0; cpt < lncpt; cpt++) {
922 ptable = the_lnet.ln_peer_tables[cpt];
923 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
925 spin_lock(&lp->lp_lock);
926 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
927 lp->lp_state |= LNET_PEER_FORCE_PUSH;
928 spin_unlock(&lp->lp_lock);
930 if (lnet_peer_needs_push(lp))
931 lnet_peer_queue_for_discovery(lp);
934 lnet_net_unlock(LNET_LOCK_EX);
935 wake_up(&the_lnet.ln_dc_waitq);
938 /* find the NID in the preferred gateways for the remote peer
940 * false: list is not empty and NID is not preferred
941 * false: list is empty
942 * true: nid is found in the list
945 lnet_peer_is_pref_rtr_locked(struct lnet_peer_ni *lpni,
948 struct lnet_nid_list *ne;
950 CDEBUG(D_NET, "%s: rtr pref emtpy: %d\n",
951 libcfs_nid2str(lpni->lpni_nid),
952 list_empty(&lpni->lpni_rtr_pref_nids));
954 if (list_empty(&lpni->lpni_rtr_pref_nids))
957 /* iterate through all the preferred NIDs and see if any of them
958 * matches the provided gw_nid
960 list_for_each_entry(ne, &lpni->lpni_rtr_pref_nids, nl_list) {
961 CDEBUG(D_NET, "Comparing pref %s with gw %s\n",
962 libcfs_nid2str(ne->nl_nid),
963 libcfs_nid2str(gw_nid));
964 if (ne->nl_nid == gw_nid)
972 lnet_peer_clr_pref_rtrs(struct lnet_peer_ni *lpni)
974 struct list_head zombies;
975 struct lnet_nid_list *ne;
976 struct lnet_nid_list *tmp;
977 int cpt = lpni->lpni_cpt;
979 INIT_LIST_HEAD(&zombies);
982 list_splice_init(&lpni->lpni_rtr_pref_nids, &zombies);
983 lnet_net_unlock(cpt);
985 list_for_each_entry_safe(ne, tmp, &zombies, nl_list) {
986 list_del(&ne->nl_list);
987 LIBCFS_FREE(ne, sizeof(*ne));
992 lnet_peer_add_pref_rtr(struct lnet_peer_ni *lpni,
995 int cpt = lpni->lpni_cpt;
996 struct lnet_nid_list *ne = NULL;
998 /* This function is called with api_mutex held. When the api_mutex
999 * is held the list can not be modified, as it is only modified as
1000 * a result of applying a UDSP and that happens under api_mutex
1003 __must_hold(&the_lnet.ln_api_mutex);
1005 list_for_each_entry(ne, &lpni->lpni_rtr_pref_nids, nl_list) {
1006 if (ne->nl_nid == gw_nid)
1010 LIBCFS_CPT_ALLOC(ne, lnet_cpt_table(), cpt, sizeof(*ne));
1014 ne->nl_nid = gw_nid;
1016 /* Lock the cpt to protect against addition and checks in the
1017 * selection algorithm
1020 list_add(&ne->nl_list, &lpni->lpni_rtr_pref_nids);
1021 lnet_net_unlock(cpt);
1027 * Test whether a ni is a preferred ni for this peer_ni, e.g, whether
1028 * this is a preferred point-to-point path. Call with lnet_net_lock in
1032 lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1034 struct lnet_nid_list *ne;
1036 if (lpni->lpni_pref_nnids == 0)
1038 if (lpni->lpni_pref_nnids == 1)
1039 return lpni->lpni_pref.nid == nid;
1040 list_for_each_entry(ne, &lpni->lpni_pref.nids, nl_list) {
1041 if (ne->nl_nid == nid)
1048 * Set a single ni as preferred, provided no preferred ni is already
1049 * defined. Only to be used for non-multi-rail peer_ni.
1052 lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1056 spin_lock(&lpni->lpni_lock);
1057 if (nid == LNET_NID_ANY) {
1059 } else if (lpni->lpni_pref_nnids > 0) {
1061 } else if (lpni->lpni_pref_nnids == 0) {
1062 lpni->lpni_pref.nid = nid;
1063 lpni->lpni_pref_nnids = 1;
1064 lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
1066 spin_unlock(&lpni->lpni_lock);
1068 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1069 libcfs_nid2str(lpni->lpni_nid), libcfs_nid2str(nid), rc);
1074 * Clear the preferred NID from a non-multi-rail peer_ni, provided
1075 * this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
1078 lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
1082 spin_lock(&lpni->lpni_lock);
1083 if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
1084 lpni->lpni_pref_nnids = 0;
1085 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1086 } else if (lpni->lpni_pref_nnids == 0) {
1091 spin_unlock(&lpni->lpni_lock);
1093 CDEBUG(D_NET, "peer %s: %d\n",
1094 libcfs_nid2str(lpni->lpni_nid), rc);
1099 lnet_peer_ni_set_selection_priority(struct lnet_peer_ni *lpni, __u32 priority)
1101 lpni->lpni_sel_priority = priority;
1105 * Clear the preferred NIDs from a non-multi-rail peer.
1108 lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
1110 struct lnet_peer_ni *lpni = NULL;
1112 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
1113 lnet_peer_ni_clr_non_mr_pref_nid(lpni);
1117 lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1119 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1120 struct lnet_nid_list *ne1 = NULL;
1121 struct lnet_nid_list *ne2 = NULL;
1122 lnet_nid_t tmp_nid = LNET_NID_ANY;
1125 if (nid == LNET_NID_ANY) {
1130 if (lpni->lpni_pref_nnids == 1 && lpni->lpni_pref.nid == nid) {
1135 /* A non-MR node may have only one preferred NI per peer_ni */
1136 if (lpni->lpni_pref_nnids > 0 &&
1137 !(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1142 /* add the new preferred nid to the list of preferred nids */
1143 if (lpni->lpni_pref_nnids != 0) {
1144 size_t alloc_size = sizeof(*ne1);
1146 if (lpni->lpni_pref_nnids == 1) {
1147 tmp_nid = lpni->lpni_pref.nid;
1148 INIT_LIST_HEAD(&lpni->lpni_pref.nids);
1151 list_for_each_entry(ne1, &lpni->lpni_pref.nids, nl_list) {
1152 if (ne1->nl_nid == nid) {
1158 LIBCFS_CPT_ALLOC(ne1, lnet_cpt_table(), lpni->lpni_cpt,
1165 /* move the originally stored nid to the list */
1166 if (lpni->lpni_pref_nnids == 1) {
1167 LIBCFS_CPT_ALLOC(ne2, lnet_cpt_table(),
1168 lpni->lpni_cpt, alloc_size);
1173 INIT_LIST_HEAD(&ne2->nl_list);
1174 ne2->nl_nid = tmp_nid;
1179 lnet_net_lock(LNET_LOCK_EX);
1180 spin_lock(&lpni->lpni_lock);
1181 if (lpni->lpni_pref_nnids == 0) {
1182 lpni->lpni_pref.nid = nid;
1185 list_add_tail(&ne2->nl_list, &lpni->lpni_pref.nids);
1186 list_add_tail(&ne1->nl_list, &lpni->lpni_pref.nids);
1188 lpni->lpni_pref_nnids++;
1189 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1190 spin_unlock(&lpni->lpni_lock);
1191 lnet_net_unlock(LNET_LOCK_EX);
1194 if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
1195 spin_lock(&lpni->lpni_lock);
1196 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1197 spin_unlock(&lpni->lpni_lock);
1199 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1200 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1205 lnet_peer_del_pref_nid(struct lnet_peer_ni *lpni, lnet_nid_t nid)
1207 struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
1208 struct lnet_nid_list *ne = NULL;
1211 if (lpni->lpni_pref_nnids == 0) {
1216 if (lpni->lpni_pref_nnids == 1) {
1217 if (lpni->lpni_pref.nid != nid) {
1222 list_for_each_entry(ne, &lpni->lpni_pref.nids, nl_list) {
1223 if (ne->nl_nid == nid)
1224 goto remove_nid_entry;
1232 lnet_net_lock(LNET_LOCK_EX);
1233 spin_lock(&lpni->lpni_lock);
1234 if (lpni->lpni_pref_nnids == 1)
1235 lpni->lpni_pref.nid = LNET_NID_ANY;
1237 list_del_init(&ne->nl_list);
1238 if (lpni->lpni_pref_nnids == 2) {
1239 struct lnet_nid_list *ne, *tmp;
1241 list_for_each_entry_safe(ne, tmp,
1242 &lpni->lpni_pref.nids,
1244 lpni->lpni_pref.nid = ne->nl_nid;
1245 list_del_init(&ne->nl_list);
1246 LIBCFS_FREE(ne, sizeof(*ne));
1250 lpni->lpni_pref_nnids--;
1251 lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
1252 spin_unlock(&lpni->lpni_lock);
1253 lnet_net_unlock(LNET_LOCK_EX);
1256 LIBCFS_FREE(ne, sizeof(*ne));
1258 CDEBUG(D_NET, "peer %s nid %s: %d\n",
1259 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid), rc);
1264 lnet_peer_clr_pref_nids(struct lnet_peer_ni *lpni)
1266 struct list_head zombies;
1267 struct lnet_nid_list *ne;
1268 struct lnet_nid_list *tmp;
1270 INIT_LIST_HEAD(&zombies);
1272 lnet_net_lock(LNET_LOCK_EX);
1273 if (lpni->lpni_pref_nnids == 1)
1274 lpni->lpni_pref.nid = LNET_NID_ANY;
1275 else if (lpni->lpni_pref_nnids > 1)
1276 list_splice_init(&lpni->lpni_pref.nids, &zombies);
1277 lpni->lpni_pref_nnids = 0;
1278 lnet_net_unlock(LNET_LOCK_EX);
1280 list_for_each_entry_safe(ne, tmp, &zombies, nl_list) {
1281 list_del_init(&ne->nl_list);
1282 LIBCFS_FREE(ne, sizeof(*ne));
1287 lnet_peer_primary_nid_locked(lnet_nid_t nid)
1289 struct lnet_peer_ni *lpni;
1290 lnet_nid_t primary_nid = nid;
1292 lpni = lnet_find_peer_ni_locked(nid);
1294 primary_nid = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
1295 lnet_peer_ni_decref_locked(lpni);
1302 lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
1303 __must_hold(&lp->lp_lock)
1305 if (lnet_peer_discovery_disabled)
1308 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
1309 (lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
1320 lnet_is_discovery_disabled(struct lnet_peer *lp)
1324 spin_lock(&lp->lp_lock);
1325 rc = lnet_is_discovery_disabled_locked(lp);
1326 spin_unlock(&lp->lp_lock);
1332 LNetPrimaryNID(lnet_nid_t nid)
1334 struct lnet_peer *lp;
1335 struct lnet_peer_ni *lpni;
1336 lnet_nid_t primary_nid = nid;
1340 if (nid == LNET_NID_LO_0)
1341 return LNET_NID_LO_0;
1343 cpt = lnet_net_lock_current();
1344 lpni = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
1349 lp = lpni->lpni_peer_net->lpn_peer;
1351 while (!lnet_peer_is_uptodate(lp)) {
1352 spin_lock(&lp->lp_lock);
1353 /* force a full discovery cycle */
1354 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
1355 spin_unlock(&lp->lp_lock);
1357 rc = lnet_discover_peer_locked(lpni, cpt, true);
1360 /* The lpni (or lp) for this NID may have changed and our ref is
1361 * the only thing keeping the old one around. Release the ref
1362 * and lookup the lpni again
1364 lnet_peer_ni_decref_locked(lpni);
1365 lpni = lnet_find_peer_ni_locked(nid);
1370 lp = lpni->lpni_peer_net->lpn_peer;
1372 /* Only try once if discovery is disabled */
1373 if (lnet_is_discovery_disabled(lp))
1376 primary_nid = lp->lp_primary_nid;
1378 lnet_peer_ni_decref_locked(lpni);
1380 lnet_net_unlock(cpt);
1382 CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nid2str(nid),
1383 libcfs_nid2str(primary_nid), rc);
1386 EXPORT_SYMBOL(LNetPrimaryNID);
1388 struct lnet_peer_net *
1389 lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
1391 struct lnet_peer_net *peer_net;
1392 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
1393 if (peer_net->lpn_net_id == net_id)
1400 * Attach a peer_ni to a peer_net and peer. This function assumes
1401 * peer_ni is not already attached to the peer_net/peer. The peer_ni
1402 * may be attached to a different peer, in which case it will be
1403 * properly detached first. The whole operation is done atomically.
1405 * This function consumes the reference on lpni and Always returns 0.
1406 * This is the last function called from functions that do return an
1407 * int, so returning 0 here allows the compiler to do a tail call.
1410 lnet_peer_attach_peer_ni(struct lnet_peer *lp,
1411 struct lnet_peer_net *lpn,
1412 struct lnet_peer_ni *lpni,
1415 struct lnet_peer_table *ptable;
1416 bool new_lpn = false;
1419 /* Install the new peer_ni */
1420 lnet_net_lock(LNET_LOCK_EX);
1421 /* Add peer_ni to global peer table hash, if necessary. */
1422 if (list_empty(&lpni->lpni_hashlist)) {
1423 int hash = lnet_nid2peerhash(lpni->lpni_nid);
1425 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1426 list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
1427 ptable->pt_version++;
1428 lnet_peer_ni_addref_locked(lpni);
1431 /* Detach the peer_ni from an existing peer, if necessary. */
1432 if (lpni->lpni_peer_net) {
1433 LASSERT(lpni->lpni_peer_net != lpn);
1434 LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
1435 lnet_peer_detach_peer_ni_locked(lpni);
1436 lnet_peer_net_decref_locked(lpni->lpni_peer_net);
1437 lpni->lpni_peer_net = NULL;
1440 /* Add peer_ni to peer_net */
1441 lpni->lpni_peer_net = lpn;
1442 list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
1443 lnet_update_peer_net_healthv(lpni);
1444 lnet_peer_net_addref_locked(lpn);
1446 /* Add peer_net to peer */
1447 if (!lpn->lpn_peer) {
1450 list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
1451 lnet_peer_addref_locked(lp);
1454 /* Add peer to global peer list, if necessary */
1455 ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
1456 if (list_empty(&lp->lp_peer_list)) {
1457 list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
1462 /* Update peer state */
1463 spin_lock(&lp->lp_lock);
1464 if (flags & LNET_PEER_CONFIGURED) {
1465 if (!(lp->lp_state & LNET_PEER_CONFIGURED))
1466 lp->lp_state |= LNET_PEER_CONFIGURED;
1468 if (flags & LNET_PEER_MULTI_RAIL) {
1469 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1470 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1471 lnet_peer_clr_non_mr_pref_nids(lp);
1474 spin_unlock(&lp->lp_lock);
1480 rc = lnet_udsp_apply_policies_on_lpn(lpn);
1482 CERROR("Failed to apply UDSPs on lpn %s\n",
1483 libcfs_net2str(lpn->lpn_net_id));
1485 rc = lnet_udsp_apply_policies_on_lpni(lpni);
1487 CERROR("Failed to apply UDSPs on lpni %s\n",
1488 libcfs_nid2str(lpni->lpni_nid));
1490 CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
1491 libcfs_nid2str(lp->lp_primary_nid),
1492 libcfs_nid2str(lpni->lpni_nid), flags);
1493 lnet_peer_ni_decref_locked(lpni);
1494 lnet_net_unlock(LNET_LOCK_EX);
1500 * Create a new peer, with nid as its primary nid.
1502 * Call with the lnet_api_mutex held.
1505 lnet_peer_add(lnet_nid_t nid, unsigned flags)
1507 struct lnet_peer *lp;
1508 struct lnet_peer_net *lpn;
1509 struct lnet_peer_ni *lpni;
1512 LASSERT(nid != LNET_NID_ANY);
1515 * No need for the lnet_net_lock here, because the
1516 * lnet_api_mutex is held.
1518 lpni = lnet_find_peer_ni_locked(nid);
1520 /* A peer with this NID already exists. */
1521 lp = lpni->lpni_peer_net->lpn_peer;
1522 lnet_peer_ni_decref_locked(lpni);
1524 * This is an error if the peer was configured and the
1525 * primary NID differs or an attempt is made to change
1526 * the Multi-Rail flag. Otherwise the assumption is
1527 * that an existing peer is being modified.
1529 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1530 if (lp->lp_primary_nid != nid)
1532 else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
1536 /* Delete and recreate as a configured peer. */
1540 /* Create peer, peer_net, and peer_ni. */
1542 lp = lnet_peer_alloc(nid);
1545 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1548 lpni = lnet_peer_ni_alloc(nid);
1552 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1555 LIBCFS_FREE(lpn, sizeof(*lpn));
1557 LIBCFS_FREE(lp, sizeof(*lp));
1559 CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
1560 libcfs_nid2str(nid), flags, rc);
1565 * Add a NID to a peer. Call with ln_api_mutex held.
1568 * -EPERM: Non-DLC addition to a DLC-configured peer.
1569 * -EEXIST: The NID was configured by DLC for a different peer.
1570 * -ENOMEM: Out of memory.
1571 * -ENOTUNIQ: Adding a second peer NID on a single network on a
1572 * non-multi-rail peer.
1575 lnet_peer_add_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1577 struct lnet_peer_net *lpn;
1578 struct lnet_peer_ni *lpni;
1582 LASSERT(nid != LNET_NID_ANY);
1584 /* A configured peer can only be updated through configuration. */
1585 if (!(flags & LNET_PEER_CONFIGURED)) {
1586 if (lp->lp_state & LNET_PEER_CONFIGURED) {
1593 * The MULTI_RAIL flag can be set but not cleared, because
1594 * that would leave the peer struct in an invalid state.
1596 if (flags & LNET_PEER_MULTI_RAIL) {
1597 spin_lock(&lp->lp_lock);
1598 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1599 lp->lp_state |= LNET_PEER_MULTI_RAIL;
1600 lnet_peer_clr_non_mr_pref_nids(lp);
1602 spin_unlock(&lp->lp_lock);
1603 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
1608 lpni = lnet_find_peer_ni_locked(nid);
1611 * A peer_ni already exists. This is only a problem if
1612 * it is not connected to this peer and was configured
1615 if (lpni->lpni_peer_net->lpn_peer == lp)
1617 if (lnet_peer_ni_is_configured(lpni)) {
1621 /* If this is the primary NID, destroy the peer. */
1622 if (lnet_peer_ni_is_primary(lpni)) {
1623 struct lnet_peer *rtr_lp =
1624 lpni->lpni_peer_net->lpn_peer;
1625 int rtr_refcount = rtr_lp->lp_rtr_refcount;
1627 * if we're trying to delete a router it means
1628 * we're moving this peer NI to a new peer so must
1629 * transfer router properties to the new peer
1631 if (rtr_refcount > 0) {
1632 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
1633 lnet_rtr_transfer_to_peer(rtr_lp, lp);
1635 lnet_peer_del(lpni->lpni_peer_net->lpn_peer);
1636 lnet_peer_ni_decref_locked(lpni);
1637 lpni = lnet_peer_ni_alloc(nid);
1644 lpni = lnet_peer_ni_alloc(nid);
1652 * Get the peer_net. Check that we're not adding a second
1653 * peer_ni on a peer_net of a non-multi-rail peer.
1655 lpn = lnet_peer_get_net_locked(lp, LNET_NIDNET(nid));
1657 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1662 } else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
1667 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1670 lnet_peer_ni_decref_locked(lpni);
1672 CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
1673 libcfs_nid2str(lp->lp_primary_nid), libcfs_nid2str(nid),
1679 * Update the primary NID of a peer, if possible.
1681 * Call with the lnet_api_mutex held.
1684 lnet_peer_set_primary_nid(struct lnet_peer *lp, lnet_nid_t nid, unsigned flags)
1686 lnet_nid_t old = lp->lp_primary_nid;
1689 if (lp->lp_primary_nid == nid)
1691 rc = lnet_peer_add_nid(lp, nid, flags);
1694 lp->lp_primary_nid = nid;
1696 CDEBUG(D_NET, "peer %s NID %s: %d\n",
1697 libcfs_nid2str(old), libcfs_nid2str(nid), rc);
1702 * lpni creation initiated due to traffic either sending or receiving.
1705 lnet_peer_ni_traffic_add(lnet_nid_t nid, lnet_nid_t pref)
1707 struct lnet_peer *lp;
1708 struct lnet_peer_net *lpn;
1709 struct lnet_peer_ni *lpni;
1713 if (nid == LNET_NID_ANY) {
1718 /* lnet_net_lock is not needed here because ln_api_lock is held */
1719 lpni = lnet_find_peer_ni_locked(nid);
1722 * We must have raced with another thread. Since we
1723 * know next to nothing about a peer_ni created by
1724 * traffic, we just assume everything is ok and
1727 lnet_peer_ni_decref_locked(lpni);
1731 /* Create peer, peer_net, and peer_ni. */
1733 lp = lnet_peer_alloc(nid);
1736 lpn = lnet_peer_net_alloc(LNET_NIDNET(nid));
1739 lpni = lnet_peer_ni_alloc(nid);
1742 if (pref != LNET_NID_ANY)
1743 lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
1745 return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
1748 LIBCFS_FREE(lpn, sizeof(*lpn));
1750 LIBCFS_FREE(lp, sizeof(*lp));
1752 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(nid), rc);
1757 * Implementation of IOC_LIBCFS_ADD_PEER_NI.
1759 * This API handles the following combinations:
1760 * Create a peer with its primary NI if only the prim_nid is provided
1761 * Add a NID to a peer identified by the prim_nid. The peer identified
1762 * by the prim_nid must already exist.
1763 * The peer being created may be non-MR.
1765 * The caller must hold ln_api_mutex. This prevents the peer from
1766 * being created/modified/deleted by a different thread.
1769 lnet_add_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid, bool mr)
1771 struct lnet_peer *lp = NULL;
1772 struct lnet_peer_ni *lpni;
1775 /* The prim_nid must always be specified */
1776 if (prim_nid == LNET_NID_ANY)
1779 flags = LNET_PEER_CONFIGURED;
1781 flags |= LNET_PEER_MULTI_RAIL;
1784 * If nid isn't specified, we must create a new peer with
1785 * prim_nid as its primary nid.
1787 if (nid == LNET_NID_ANY)
1788 return lnet_peer_add(prim_nid, flags);
1790 /* Look up the prim_nid, which must exist. */
1791 lpni = lnet_find_peer_ni_locked(prim_nid);
1794 lnet_peer_ni_decref_locked(lpni);
1795 lp = lpni->lpni_peer_net->lpn_peer;
1797 /* Peer must have been configured. */
1798 if (!(lp->lp_state & LNET_PEER_CONFIGURED)) {
1799 CDEBUG(D_NET, "peer %s was not configured\n",
1800 libcfs_nid2str(prim_nid));
1804 /* Primary NID must match */
1805 if (lp->lp_primary_nid != prim_nid) {
1806 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1807 libcfs_nid2str(prim_nid),
1808 libcfs_nid2str(lp->lp_primary_nid));
1812 /* Multi-Rail flag must match. */
1813 if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
1814 CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
1815 libcfs_nid2str(prim_nid));
1819 return lnet_peer_add_nid(lp, nid, flags);
1823 * Implementation of IOC_LIBCFS_DEL_PEER_NI.
1825 * This API handles the following combinations:
1826 * Delete a NI from a peer if both prim_nid and nid are provided.
1827 * Delete a peer if only prim_nid is provided.
1828 * Delete a peer if its primary nid is provided.
1830 * The caller must hold ln_api_mutex. This prevents the peer from
1831 * being modified/deleted by a different thread.
1834 lnet_del_peer_ni(lnet_nid_t prim_nid, lnet_nid_t nid)
1836 struct lnet_peer *lp;
1837 struct lnet_peer_ni *lpni;
1840 if (prim_nid == LNET_NID_ANY)
1843 lpni = lnet_find_peer_ni_locked(prim_nid);
1846 lnet_peer_ni_decref_locked(lpni);
1847 lp = lpni->lpni_peer_net->lpn_peer;
1849 if (prim_nid != lp->lp_primary_nid) {
1850 CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
1851 libcfs_nid2str(prim_nid),
1852 libcfs_nid2str(lp->lp_primary_nid));
1856 lnet_net_lock(LNET_LOCK_EX);
1857 if (lp->lp_rtr_refcount > 0) {
1858 lnet_net_unlock(LNET_LOCK_EX);
1859 CERROR("%s is a router. Can not be deleted\n",
1860 libcfs_nid2str(prim_nid));
1863 lnet_net_unlock(LNET_LOCK_EX);
1865 if (nid == LNET_NID_ANY || nid == lp->lp_primary_nid)
1866 return lnet_peer_del(lp);
1868 flags = LNET_PEER_CONFIGURED;
1869 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
1870 flags |= LNET_PEER_MULTI_RAIL;
1872 return lnet_peer_del_nid(lp, nid, flags);
1876 lnet_destroy_peer_ni_locked(struct kref *ref)
1878 struct lnet_peer_ni *lpni = container_of(ref, struct lnet_peer_ni,
1880 struct lnet_peer_table *ptable;
1881 struct lnet_peer_net *lpn;
1883 CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nid2str(lpni->lpni_nid));
1885 LASSERT(kref_read(&lpni->lpni_kref) == 0);
1886 LASSERT(list_empty(&lpni->lpni_txq));
1887 LASSERT(lpni->lpni_txqnob == 0);
1888 LASSERT(list_empty(&lpni->lpni_peer_nis));
1889 LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
1891 lpn = lpni->lpni_peer_net;
1892 lpni->lpni_peer_net = NULL;
1893 lpni->lpni_net = NULL;
1895 if (!list_empty(&lpni->lpni_hashlist)) {
1896 /* remove the peer ni from the zombie list */
1897 ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
1898 spin_lock(&ptable->pt_zombie_lock);
1899 list_del_init(&lpni->lpni_hashlist);
1900 ptable->pt_zombies--;
1901 spin_unlock(&ptable->pt_zombie_lock);
1904 if (lpni->lpni_pref_nnids > 1) {
1905 struct lnet_nid_list *ne, *tmp;
1907 list_for_each_entry_safe(ne, tmp, &lpni->lpni_pref.nids,
1909 list_del_init(&ne->nl_list);
1910 LIBCFS_FREE(ne, sizeof(*ne));
1913 LIBCFS_FREE(lpni, sizeof(*lpni));
1916 lnet_peer_net_decref_locked(lpn);
1919 struct lnet_peer_ni *
1920 lnet_nid2peerni_ex(lnet_nid_t nid, int cpt)
1922 struct lnet_peer_ni *lpni = NULL;
1925 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1926 return ERR_PTR(-ESHUTDOWN);
1929 * find if a peer_ni already exists.
1930 * If so then just return that.
1932 lpni = lnet_find_peer_ni_locked(nid);
1936 lnet_net_unlock(cpt);
1938 rc = lnet_peer_ni_traffic_add(nid, LNET_NID_ANY);
1941 goto out_net_relock;
1944 lpni = lnet_find_peer_ni_locked(nid);
1954 * Get a peer_ni for the given nid, create it if necessary. Takes a
1955 * hold on the peer_ni.
1957 struct lnet_peer_ni *
1958 lnet_nid2peerni_locked(lnet_nid_t nid, lnet_nid_t pref, int cpt)
1960 struct lnet_peer_ni *lpni = NULL;
1963 if (the_lnet.ln_state != LNET_STATE_RUNNING)
1964 return ERR_PTR(-ESHUTDOWN);
1967 * find if a peer_ni already exists.
1968 * If so then just return that.
1970 lpni = lnet_find_peer_ni_locked(nid);
1976 * use the lnet_api_mutex to serialize the creation of the peer_ni
1977 * and the creation/deletion of the local ni/net. When a local ni is
1978 * created, if there exists a set of peer_nis on that network,
1979 * they need to be traversed and updated. When a local NI is
1980 * deleted, which could result in a network being deleted, then
1981 * all peer nis on that network need to be removed as well.
1983 * Creation through traffic should also be serialized with
1984 * creation through DLC.
1986 lnet_net_unlock(cpt);
1987 mutex_lock(&the_lnet.ln_api_mutex);
1989 * Shutdown is only set under the ln_api_lock, so a single
1990 * check here is sufficent.
1992 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1993 lpni = ERR_PTR(-ESHUTDOWN);
1994 goto out_mutex_unlock;
1997 rc = lnet_peer_ni_traffic_add(nid, pref);
2000 goto out_mutex_unlock;
2003 lpni = lnet_find_peer_ni_locked(nid);
2007 mutex_unlock(&the_lnet.ln_api_mutex);
2010 /* Lock has been dropped, check again for shutdown. */
2011 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
2013 lnet_peer_ni_decref_locked(lpni);
2014 lpni = ERR_PTR(-ESHUTDOWN);
2021 lnet_peer_gw_discovery(struct lnet_peer *lp)
2025 spin_lock(&lp->lp_lock);
2026 if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
2028 spin_unlock(&lp->lp_lock);
2034 lnet_peer_is_uptodate(struct lnet_peer *lp)
2038 spin_lock(&lp->lp_lock);
2039 rc = lnet_peer_is_uptodate_locked(lp);
2040 spin_unlock(&lp->lp_lock);
2045 * Is a peer uptodate from the point of view of discovery?
2047 * If it is currently being processed, obviously not.
2048 * A forced Ping or Push is also handled by the discovery thread.
2050 * Otherwise look at whether the peer needs rediscovering.
2053 lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
2054 __must_hold(&lp->lp_lock)
2058 if (lp->lp_state & (LNET_PEER_DISCOVERING |
2059 LNET_PEER_FORCE_PING |
2060 LNET_PEER_FORCE_PUSH)) {
2062 } else if (lp->lp_state & LNET_PEER_REDISCOVER) {
2064 } else if (lnet_peer_needs_push(lp)) {
2066 } else if (lp->lp_state & LNET_PEER_DISCOVERED) {
2067 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
2078 /* Add the message to the peer's lp_dc_pendq and queue the peer for discovery */
2080 lnet_peer_queue_message(struct lnet_peer *lp, struct lnet_msg *msg)
2082 /* The discovery thread holds net_lock/EX and lp_lock when it splices
2083 * the lp_dc_pendq onto a local list for resending. Thus, we do the same
2084 * when adding to the list and queuing the peer to ensure that we do not
2085 * strand any messages on the lp_dc_pendq. This scheme ensures the
2086 * message will be resent even if the peer is already being discovered.
2087 * Therefore we needn't check the return value of
2088 * lnet_peer_queue_for_discovery(lp).
2090 lnet_net_lock(LNET_LOCK_EX);
2091 spin_lock(&lp->lp_lock);
2092 list_add_tail(&msg->msg_list, &lp->lp_dc_pendq);
2093 spin_unlock(&lp->lp_lock);
2094 lnet_peer_queue_for_discovery(lp);
2095 lnet_net_unlock(LNET_LOCK_EX);
2099 * Queue a peer for the attention of the discovery thread. Call with
2100 * lnet_net_lock/EX held. Returns 0 if the peer was queued, and
2101 * -EALREADY if the peer was already queued.
2103 static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
2107 spin_lock(&lp->lp_lock);
2108 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2109 lp->lp_state |= LNET_PEER_DISCOVERING;
2110 spin_unlock(&lp->lp_lock);
2111 if (list_empty(&lp->lp_dc_list)) {
2112 lnet_peer_addref_locked(lp);
2113 list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2114 wake_up(&the_lnet.ln_dc_waitq);
2120 CDEBUG(D_NET, "Queue peer %s: %d\n",
2121 libcfs_nid2str(lp->lp_primary_nid), rc);
2127 * Discovery of a peer is complete. Wake all waiters on the peer.
2128 * Call with lnet_net_lock/EX held.
2130 static void lnet_peer_discovery_complete(struct lnet_peer *lp)
2132 struct lnet_msg *msg, *tmp;
2134 LIST_HEAD(pending_msgs);
2136 CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
2137 libcfs_nid2str(lp->lp_primary_nid));
2139 list_del_init(&lp->lp_dc_list);
2140 spin_lock(&lp->lp_lock);
2141 list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
2142 spin_unlock(&lp->lp_lock);
2143 wake_up_all(&lp->lp_dc_waitq);
2145 if (lp->lp_rtr_refcount > 0)
2146 lnet_router_discovery_complete(lp);
2148 lnet_net_unlock(LNET_LOCK_EX);
2150 /* iterate through all pending messages and send them again */
2151 list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
2152 list_del_init(&msg->msg_list);
2153 if (lp->lp_dc_error) {
2154 lnet_finalize(msg, lp->lp_dc_error);
2158 CDEBUG(D_NET, "sending pending message %s to target %s\n",
2159 lnet_msgtyp2str(msg->msg_type),
2160 libcfs_id2str(msg->msg_target));
2161 rc = lnet_send(msg->msg_src_nid_param, msg,
2162 msg->msg_rtr_nid_param);
2164 CNETERR("Error sending %s to %s: %d\n",
2165 lnet_msgtyp2str(msg->msg_type),
2166 libcfs_id2str(msg->msg_target), rc);
2167 lnet_finalize(msg, rc);
2170 lnet_net_lock(LNET_LOCK_EX);
2171 lnet_peer_decref_locked(lp);
2175 * Handle inbound push.
2176 * Like any event handler, called with lnet_res_lock/CPT held.
2178 void lnet_peer_push_event(struct lnet_event *ev)
2180 struct lnet_ping_buffer *pbuf;
2181 struct lnet_peer *lp;
2183 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start + ev->offset);
2185 /* lnet_find_peer() adds a refcount */
2186 lp = lnet_find_peer(ev->source.nid);
2188 CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
2189 libcfs_nid2str(ev->initiator.nid),
2190 libcfs_nid2str(ev->source.nid));
2191 pbuf->pb_needs_post = true;
2195 /* Ensure peer state remains consistent while we modify it. */
2196 spin_lock(&lp->lp_lock);
2199 * If some kind of error happened the contents of the message
2200 * cannot be used. Clear the NIDS_UPTODATE and set the
2201 * FORCE_PING flag to trigger a ping.
2204 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2205 lp->lp_state |= LNET_PEER_FORCE_PING;
2206 CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
2208 libcfs_nid2str(lp->lp_primary_nid),
2209 libcfs_nid2str(ev->source.nid));
2214 * A push with invalid or corrupted info. Clear the UPTODATE
2215 * flag to trigger a ping.
2217 if (lnet_ping_info_validate(&pbuf->pb_info)) {
2218 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2219 lp->lp_state |= LNET_PEER_FORCE_PING;
2220 CDEBUG(D_NET, "Corrupted Push from %s\n",
2221 libcfs_nid2str(lp->lp_primary_nid));
2226 * Make sure we'll allocate the correct size ping buffer when
2229 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2230 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2233 * A non-Multi-Rail peer is not supposed to be capable of
2236 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
2237 CERROR("Push from non-Multi-Rail peer %s dropped\n",
2238 libcfs_nid2str(lp->lp_primary_nid));
2243 * The peer may have discovery disabled at its end. Set
2244 * NO_DISCOVERY as appropriate.
2246 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
2247 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2248 libcfs_nid2str(lp->lp_primary_nid));
2250 * Mark the peer for deletion if we already know about it
2251 * and it's going from discovery set to no discovery set
2253 if (!(lp->lp_state & (LNET_PEER_NO_DISCOVERY |
2254 LNET_PEER_DISCOVERING)) &&
2255 lp->lp_state & LNET_PEER_DISCOVERED) {
2256 CDEBUG(D_NET, "Marking %s:0x%x for deletion\n",
2257 libcfs_nid2str(lp->lp_primary_nid),
2259 lp->lp_state |= LNET_PEER_MARK_DELETION;
2261 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2262 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2263 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2264 libcfs_nid2str(lp->lp_primary_nid));
2265 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2269 * Update the MULTI_RAIL flag based on the push. If the peer
2270 * was configured with DLC then the setting should match what
2272 * NB: We verified above that the MR feature bit is set in pi_features
2274 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2275 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2276 libcfs_nid2str(lp->lp_primary_nid), lp);
2277 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2278 CWARN("Push says %s is Multi-Rail, DLC says not\n",
2279 libcfs_nid2str(lp->lp_primary_nid));
2280 } else if (lnet_peer_discovery_disabled) {
2281 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled locally\n",
2282 libcfs_nid2str(lp->lp_primary_nid), lp);
2283 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2284 CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled remotely\n",
2285 libcfs_nid2str(lp->lp_primary_nid), lp);
2287 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2288 libcfs_nid2str(lp->lp_primary_nid), lp);
2289 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2290 lnet_peer_clr_non_mr_pref_nids(lp);
2294 * Check for truncation of the Put message. Clear the
2295 * NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
2296 * and tell discovery to allocate a bigger buffer.
2298 if (ev->mlength < ev->rlength) {
2299 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2300 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2301 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2302 lp->lp_state |= LNET_PEER_FORCE_PING;
2303 CDEBUG(D_NET, "Truncated Push from %s (%d nids)\n",
2304 libcfs_nid2str(lp->lp_primary_nid),
2305 pbuf->pb_info.pi_nnis);
2309 /* always assume new data */
2310 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2311 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2314 * If there is data present that hasn't been processed yet,
2315 * we'll replace it if the Put contained newer data and it
2316 * fits. We're racing with a Ping or earlier Push in this
2319 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2320 if (LNET_PING_BUFFER_SEQNO(pbuf) >
2321 LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
2322 pbuf->pb_info.pi_nnis <= lp->lp_data->pb_nnis) {
2323 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2324 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2325 CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
2326 libcfs_nid2str(lp->lp_primary_nid),
2327 LNET_PING_BUFFER_SEQNO(pbuf),
2328 LNET_PING_BUFFER_SEQNO(lp->lp_data));
2334 * Allocate a buffer to copy the data. On a failure we drop
2335 * the Push and set FORCE_PING to force the discovery
2336 * thread to fix the problem by pinging the peer.
2338 lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_nnis, GFP_ATOMIC);
2340 lp->lp_state |= LNET_PEER_FORCE_PING;
2341 CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
2342 libcfs_nid2str(lp->lp_primary_nid),
2343 LNET_PING_BUFFER_SEQNO(pbuf));
2348 memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
2349 LNET_PING_INFO_SIZE(pbuf->pb_info.pi_nnis));
2350 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2351 CDEBUG(D_NET, "Received Push %s %u\n",
2352 libcfs_nid2str(lp->lp_primary_nid),
2353 LNET_PING_BUFFER_SEQNO(pbuf));
2356 /* We've processed this buffer. It can be reposted */
2357 pbuf->pb_needs_post = true;
2360 * Queue the peer for discovery if not done, force it on the request
2361 * queue and wake the discovery thread if the peer was already queued,
2362 * because its status changed.
2364 spin_unlock(&lp->lp_lock);
2365 lnet_net_lock(LNET_LOCK_EX);
2366 if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
2367 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2368 wake_up(&the_lnet.ln_dc_waitq);
2370 /* Drop refcount from lookup */
2371 lnet_peer_decref_locked(lp);
2372 lnet_net_unlock(LNET_LOCK_EX);
2376 * Clear the discovery error state, unless we're already discovering
2377 * this peer, in which case the error is current.
2379 static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
2381 spin_lock(&lp->lp_lock);
2382 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
2383 lp->lp_dc_error = 0;
2384 spin_unlock(&lp->lp_lock);
2388 * Peer discovery slow path. The ln_api_mutex is held on entry, and
2389 * dropped/retaken within this function. An lnet_peer_ni is passed in
2390 * because discovery could tear down an lnet_peer.
2393 lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
2396 struct lnet_peer *lp;
2401 lnet_net_unlock(cpt);
2402 lnet_net_lock(LNET_LOCK_EX);
2403 lp = lpni->lpni_peer_net->lpn_peer;
2404 lnet_peer_clear_discovery_error(lp);
2407 * We're willing to be interrupted. The lpni can become a
2408 * zombie if we race with DLC, so we must check for that.
2411 /* Keep lp alive when the lnet_net_lock is unlocked */
2412 lnet_peer_addref_locked(lp);
2413 prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
2414 if (signal_pending(current))
2416 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2419 * Don't repeat discovery if discovery is disabled. This is
2420 * done to ensure we can use discovery as a standard ping as
2421 * well for backwards compatibility with routers which do not
2422 * have discovery or have discovery disabled
2424 if (lnet_is_discovery_disabled(lp) && count > 0)
2426 if (lp->lp_dc_error)
2428 if (lnet_peer_is_uptodate(lp))
2430 lnet_peer_queue_for_discovery(lp);
2432 CDEBUG(D_NET, "Discovery attempt # %d\n", count);
2435 * If caller requested a non-blocking operation then
2436 * return immediately. Once discovery is complete any
2437 * pending messages that were stopped due to discovery
2438 * will be transmitted.
2443 lnet_net_unlock(LNET_LOCK_EX);
2445 finish_wait(&lp->lp_dc_waitq, &wait);
2446 lnet_net_lock(LNET_LOCK_EX);
2447 lnet_peer_decref_locked(lp);
2448 /* Peer may have changed */
2449 lp = lpni->lpni_peer_net->lpn_peer;
2451 finish_wait(&lp->lp_dc_waitq, &wait);
2453 lnet_net_unlock(LNET_LOCK_EX);
2455 lnet_peer_decref_locked(lp);
2457 * The peer may have changed, so re-check and rediscover if that turns
2458 * out to have been the case. The reference count on lp ensured that
2459 * even if it was unlinked from lpni the memory could not be recycled.
2460 * Thus the check below is sufficient to determine whether the peer
2461 * changed. If the peer changed, then lp must not be dereferenced.
2463 if (lp != lpni->lpni_peer_net->lpn_peer)
2466 if (signal_pending(current))
2468 else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
2470 else if (lp->lp_dc_error)
2471 rc = lp->lp_dc_error;
2473 CDEBUG(D_NET, "non-blocking discovery\n");
2474 else if (!lnet_peer_is_uptodate(lp) && !lnet_is_discovery_disabled(lp))
2477 CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
2478 (lp ? libcfs_nid2str(lp->lp_primary_nid) : "(none)"),
2479 libcfs_nid2str(lpni->lpni_nid), rc,
2480 (!block) ? "pending discovery" : "discovery complete");
2485 /* Handle an incoming ack for a push. */
2487 lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
2489 struct lnet_ping_buffer *pbuf;
2491 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2492 spin_lock(&lp->lp_lock);
2493 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2494 lp->lp_push_error = ev->status;
2496 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2498 lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2499 spin_unlock(&lp->lp_lock);
2501 CDEBUG(D_NET, "peer %s ev->status %d\n",
2502 libcfs_nid2str(lp->lp_primary_nid), ev->status);
2505 /* Handle a Reply message. This is the reply to a Ping message. */
2507 lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
2509 struct lnet_ping_buffer *pbuf;
2512 spin_lock(&lp->lp_lock);
2514 lp->lp_disc_src_nid = ev->target.nid;
2517 * If some kind of error happened the contents of message
2518 * cannot be used. Set PING_FAILED to trigger a retry.
2521 lp->lp_state |= LNET_PEER_PING_FAILED;
2522 lp->lp_ping_error = ev->status;
2523 CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
2525 libcfs_nid2str(lp->lp_primary_nid),
2526 libcfs_nid2str(ev->source.nid));
2530 pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
2531 if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2532 lnet_swap_pinginfo(pbuf);
2535 * A reply with invalid or corrupted info. Set PING_FAILED to
2538 rc = lnet_ping_info_validate(&pbuf->pb_info);
2540 lp->lp_state |= LNET_PEER_PING_FAILED;
2541 lp->lp_ping_error = 0;
2542 CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
2543 libcfs_nid2str(lp->lp_primary_nid), rc);
2549 * The peer may have discovery disabled at its end. Set
2550 * NO_DISCOVERY as appropriate.
2552 if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY) &&
2553 !lnet_peer_discovery_disabled) {
2554 CDEBUG(D_NET, "Peer %s has discovery enabled\n",
2555 libcfs_nid2str(lp->lp_primary_nid));
2556 lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
2558 CDEBUG(D_NET, "Peer %s has discovery disabled\n",
2559 libcfs_nid2str(lp->lp_primary_nid));
2560 lp->lp_state |= LNET_PEER_NO_DISCOVERY;
2564 * Update the MULTI_RAIL flag based on the reply. If the peer
2565 * was configured with DLC then the setting should match what
2568 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
2569 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2570 CDEBUG(D_NET, "peer %s(%p) is MR\n",
2571 libcfs_nid2str(lp->lp_primary_nid), lp);
2572 } else if (lp->lp_state & LNET_PEER_CONFIGURED) {
2573 CWARN("Reply says %s is Multi-Rail, DLC says not\n",
2574 libcfs_nid2str(lp->lp_primary_nid));
2575 } else if (lnet_peer_discovery_disabled) {
2577 "peer %s(%p) not MR: DD disabled locally\n",
2578 libcfs_nid2str(lp->lp_primary_nid), lp);
2579 } else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
2581 "peer %s(%p) not MR: DD disabled remotely\n",
2582 libcfs_nid2str(lp->lp_primary_nid), lp);
2584 CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
2585 libcfs_nid2str(lp->lp_primary_nid), lp);
2586 lp->lp_state |= LNET_PEER_MULTI_RAIL;
2587 lnet_peer_clr_non_mr_pref_nids(lp);
2589 } else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2590 if (lp->lp_state & LNET_PEER_CONFIGURED) {
2591 CWARN("DLC says %s is Multi-Rail, Reply says not\n",
2592 libcfs_nid2str(lp->lp_primary_nid));
2594 CERROR("Multi-Rail state vanished from %s\n",
2595 libcfs_nid2str(lp->lp_primary_nid));
2596 lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
2601 * Make sure we'll allocate the correct size ping buffer when
2604 if (lp->lp_data_nnis < pbuf->pb_info.pi_nnis)
2605 lp->lp_data_nnis = pbuf->pb_info.pi_nnis;
2608 * Check for truncation of the Reply. Clear PING_SENT and set
2609 * PING_FAILED to trigger a retry.
2611 if (pbuf->pb_nnis < pbuf->pb_info.pi_nnis) {
2612 if (the_lnet.ln_push_target_nnis < pbuf->pb_info.pi_nnis)
2613 the_lnet.ln_push_target_nnis = pbuf->pb_info.pi_nnis;
2614 lp->lp_state |= LNET_PEER_PING_FAILED;
2615 lp->lp_ping_error = 0;
2616 CDEBUG(D_NET, "Truncated Reply from %s (%d nids)\n",
2617 libcfs_nid2str(lp->lp_primary_nid),
2618 pbuf->pb_info.pi_nnis);
2623 * Check the sequence numbers in the reply. These are only
2624 * available if the reply came from a Multi-Rail peer.
2626 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
2627 pbuf->pb_info.pi_nnis > 1 &&
2628 lp->lp_primary_nid == pbuf->pb_info.pi_ni[1].ns_nid) {
2629 if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
2630 CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
2631 libcfs_nid2str(lp->lp_primary_nid),
2632 LNET_PING_BUFFER_SEQNO(pbuf),
2635 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2638 /* We're happy with the state of the data in the buffer. */
2639 CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
2640 libcfs_nid2str(lp->lp_primary_nid), lp->lp_peer_seqno, lp->lp_state);
2641 if (lp->lp_state & LNET_PEER_DATA_PRESENT)
2642 lnet_ping_buffer_decref(lp->lp_data);
2644 lp->lp_state |= LNET_PEER_DATA_PRESENT;
2645 lnet_ping_buffer_addref(pbuf);
2648 lp->lp_state &= ~LNET_PEER_PING_SENT;
2649 spin_unlock(&lp->lp_lock);
2651 lnet_net_lock(LNET_LOCK_EX);
2653 * If this peer is a gateway, call the routing callback to
2654 * handle the ping reply
2656 if (lp->lp_rtr_refcount > 0)
2657 lnet_router_discovery_ping_reply(lp);
2658 lnet_net_unlock(LNET_LOCK_EX);
2662 * Send event handling. Only matters for error cases, where we clean
2663 * up state on the peer and peer_ni that would otherwise be updated in
2664 * the REPLY event handler for a successful Ping, and the ACK event
2665 * handler for a successful Push.
2668 lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
2675 spin_lock(&lp->lp_lock);
2676 if (ev->msg_type == LNET_MSG_GET) {
2677 lp->lp_state &= ~LNET_PEER_PING_SENT;
2678 lp->lp_state |= LNET_PEER_PING_FAILED;
2679 lp->lp_ping_error = ev->status;
2680 } else { /* ev->msg_type == LNET_MSG_PUT */
2681 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2682 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2683 lp->lp_push_error = ev->status;
2685 spin_unlock(&lp->lp_lock);
2686 rc = LNET_REDISCOVER_PEER;
2688 CDEBUG(D_NET, "%s Send to %s: %d\n",
2689 (ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
2690 libcfs_nid2str(ev->target.nid), rc);
2695 * Unlink event handling. This event is only seen if a call to
2696 * LNetMDUnlink() caused the event to be unlinked. If this call was
2697 * made after the event was set up in LNetGet() or LNetPut() then we
2698 * assume the Ping or Push timed out.
2701 lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
2703 spin_lock(&lp->lp_lock);
2704 /* We've passed through LNetGet() */
2705 if (lp->lp_state & LNET_PEER_PING_SENT) {
2706 lp->lp_state &= ~LNET_PEER_PING_SENT;
2707 lp->lp_state |= LNET_PEER_PING_FAILED;
2708 lp->lp_ping_error = -ETIMEDOUT;
2709 CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
2710 libcfs_nid2str(lp->lp_primary_nid));
2712 /* We've passed through LNetPut() */
2713 if (lp->lp_state & LNET_PEER_PUSH_SENT) {
2714 lp->lp_state &= ~LNET_PEER_PUSH_SENT;
2715 lp->lp_state |= LNET_PEER_PUSH_FAILED;
2716 lp->lp_push_error = -ETIMEDOUT;
2717 CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
2718 libcfs_nid2str(lp->lp_primary_nid));
2720 spin_unlock(&lp->lp_lock);
2724 * Event handler for the discovery EQ.
2726 * Called with lnet_res_lock(cpt) held. The cpt is the
2727 * lnet_cpt_of_cookie() of the md handle cookie.
2729 static void lnet_discovery_event_handler(struct lnet_event *event)
2731 struct lnet_peer *lp = event->md_user_ptr;
2732 struct lnet_ping_buffer *pbuf;
2735 /* discovery needs to take another look */
2736 rc = LNET_REDISCOVER_PEER;
2738 CDEBUG(D_NET, "Received event: %d\n", event->type);
2740 switch (event->type) {
2741 case LNET_EVENT_ACK:
2742 lnet_discovery_event_ack(lp, event);
2744 case LNET_EVENT_REPLY:
2745 lnet_discovery_event_reply(lp, event);
2747 case LNET_EVENT_SEND:
2748 /* Only send failure triggers a retry. */
2749 rc = lnet_discovery_event_send(lp, event);
2751 case LNET_EVENT_UNLINK:
2752 /* LNetMDUnlink() was called */
2753 lnet_discovery_event_unlink(lp, event);
2756 /* Invalid events. */
2759 lnet_net_lock(LNET_LOCK_EX);
2760 if (event->unlinked) {
2761 pbuf = LNET_PING_INFO_TO_BUFFER(event->md_start);
2762 lnet_ping_buffer_decref(pbuf);
2763 lnet_peer_decref_locked(lp);
2766 /* put peer back at end of request queue, if discovery not already
2768 if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp)) {
2769 list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2770 wake_up(&the_lnet.ln_dc_waitq);
2772 lnet_net_unlock(LNET_LOCK_EX);
2776 * Build a peer from incoming data.
2778 * The NIDs in the incoming data are supposed to be structured as follows:
2781 * - other NIDs in same net
2782 * - NIDs in second net
2783 * - NIDs in third net
2785 * This due to the way the list of NIDs in the data is created.
2787 * Note that this function will mark the peer uptodate unless an
2788 * ENOMEM is encontered. All other errors are due to a conflict
2789 * between the DLC configuration and what discovery sees. We treat DLC
2790 * as binding, and therefore set the NIDS_UPTODATE flag to prevent the
2791 * peer from becoming stuck in discovery.
2793 static int lnet_peer_merge_data(struct lnet_peer *lp,
2794 struct lnet_ping_buffer *pbuf)
2796 struct lnet_peer_ni *lpni;
2797 lnet_nid_t *curnis = NULL;
2798 struct lnet_ni_status *addnis = NULL;
2799 lnet_nid_t *delnis = NULL;
2809 flags = LNET_PEER_DISCOVERED;
2810 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
2811 flags |= LNET_PEER_MULTI_RAIL;
2814 * Cache the routing feature for the peer; whether it is enabled
2815 * for disabled as reported by the remote peer.
2817 spin_lock(&lp->lp_lock);
2818 if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
2819 lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
2821 lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
2822 spin_unlock(&lp->lp_lock);
2824 nnis = max_t(int, lp->lp_nnis, pbuf->pb_info.pi_nnis);
2825 CFS_ALLOC_PTR_ARRAY(curnis, nnis);
2826 CFS_ALLOC_PTR_ARRAY(addnis, nnis);
2827 CFS_ALLOC_PTR_ARRAY(delnis, nnis);
2828 if (!curnis || !addnis || !delnis) {
2836 /* Construct the list of NIDs present in peer. */
2838 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
2839 curnis[ncurnis++] = lpni->lpni_nid;
2842 * Check for NIDs in pbuf not present in curnis[].
2843 * The loop starts at 1 to skip the loopback NID.
2845 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
2846 for (j = 0; j < ncurnis; j++)
2847 if (pbuf->pb_info.pi_ni[i].ns_nid == curnis[j])
2850 addnis[naddnis++] = pbuf->pb_info.pi_ni[i];
2853 * Check for NIDs in curnis[] not present in pbuf.
2854 * The nested loop starts at 1 to skip the loopback NID.
2856 * But never add the loopback NID to delnis[]: if it is
2857 * present in curnis[] then this peer is for this node.
2859 for (i = 0; i < ncurnis; i++) {
2860 if (curnis[i] == LNET_NID_LO_0)
2862 for (j = 1; j < pbuf->pb_info.pi_nnis; j++) {
2863 if (curnis[i] == pbuf->pb_info.pi_ni[j].ns_nid) {
2865 * update the information we cache for the
2866 * peer with the latest information we
2869 lpni = lnet_find_peer_ni_locked(curnis[i]);
2871 lpni->lpni_ns_status = pbuf->pb_info.pi_ni[j].ns_status;
2872 lnet_peer_ni_decref_locked(lpni);
2877 if (j == pbuf->pb_info.pi_nnis)
2878 delnis[ndelnis++] = curnis[i];
2882 * If we get here and the discovery is disabled then we don't want
2883 * to add or delete any NIs. We just updated the ones we have some
2884 * information on, and call it a day
2887 if (lnet_is_discovery_disabled(lp))
2890 for (i = 0; i < naddnis; i++) {
2891 rc = lnet_peer_add_nid(lp, addnis[i].ns_nid, flags);
2893 CERROR("Error adding NID %s to peer %s: %d\n",
2894 libcfs_nid2str(addnis[i].ns_nid),
2895 libcfs_nid2str(lp->lp_primary_nid), rc);
2899 lpni = lnet_find_peer_ni_locked(addnis[i].ns_nid);
2901 lpni->lpni_ns_status = addnis[i].ns_status;
2902 lnet_peer_ni_decref_locked(lpni);
2906 for (i = 0; i < ndelnis; i++) {
2908 * for routers it's okay to delete the primary_nid because
2909 * the upper layers don't really rely on it. So if we're
2910 * being told that the router changed its primary_nid
2911 * then it's okay to delete it.
2913 if (lp->lp_rtr_refcount > 0)
2914 flags |= LNET_PEER_RTR_NI_FORCE_DEL;
2915 rc = lnet_peer_del_nid(lp, delnis[i], flags);
2917 CERROR("Error deleting NID %s from peer %s: %d\n",
2918 libcfs_nid2str(delnis[i]),
2919 libcfs_nid2str(lp->lp_primary_nid), rc);
2925 * Errors other than -ENOMEM are due to peers having been
2926 * configured with DLC. Ignore these because DLC overrides
2931 CFS_FREE_PTR_ARRAY(curnis, nnis);
2932 CFS_FREE_PTR_ARRAY(addnis, nnis);
2933 CFS_FREE_PTR_ARRAY(delnis, nnis);
2934 lnet_ping_buffer_decref(pbuf);
2935 CDEBUG(D_NET, "peer %s (%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
2938 spin_lock(&lp->lp_lock);
2939 lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
2940 lp->lp_state |= LNET_PEER_FORCE_PING;
2941 spin_unlock(&lp->lp_lock);
2947 * The data in pbuf says lp is its primary peer, but the data was
2948 * received by a different peer. Try to update lp with the data.
2951 lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
2953 struct lnet_handle_md mdh;
2955 /* Queue lp for discovery, and force it on the request queue. */
2956 lnet_net_lock(LNET_LOCK_EX);
2957 if (lnet_peer_queue_for_discovery(lp))
2958 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
2959 lnet_net_unlock(LNET_LOCK_EX);
2961 LNetInvalidateMDHandle(&mdh);
2964 * Decide whether we can move the peer to the DATA_PRESENT state.
2966 * We replace stale data for a multi-rail peer, repair PING_FAILED
2967 * status, and preempt FORCE_PING.
2969 * If after that we have DATA_PRESENT, we merge it into this peer.
2971 spin_lock(&lp->lp_lock);
2972 if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
2973 if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
2974 lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
2975 } else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2976 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2977 lnet_ping_buffer_decref(pbuf);
2982 if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
2983 lnet_ping_buffer_decref(lp->lp_data);
2985 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
2987 if (lp->lp_state & LNET_PEER_PING_FAILED) {
2988 mdh = lp->lp_ping_mdh;
2989 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
2990 lp->lp_state &= ~LNET_PEER_PING_FAILED;
2991 lp->lp_ping_error = 0;
2993 if (lp->lp_state & LNET_PEER_FORCE_PING)
2994 lp->lp_state &= ~LNET_PEER_FORCE_PING;
2995 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
2996 spin_unlock(&lp->lp_lock);
2998 if (!LNetMDHandleIsInvalid(mdh))
3002 return lnet_peer_merge_data(lp, pbuf);
3004 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3008 static bool lnet_is_nid_in_ping_info(lnet_nid_t nid, struct lnet_ping_info *pinfo)
3012 for (i = 0; i < pinfo->pi_nnis; i++) {
3013 if (pinfo->pi_ni[i].ns_nid == nid)
3020 /* Delete a peer that has been marked for deletion. NB: when this peer was added
3021 * to the discovery queue a reference was taken that will prevent the peer from
3022 * actually being freed by this function. After this function exits the
3023 * discovery thread should call lnet_peer_discovery_complete() which will
3024 * drop that reference as well as wake any waiters that may also be holding a
3027 static int lnet_peer_deletion(struct lnet_peer *lp)
3028 __must_hold(&lp->lp_lock)
3030 struct list_head rlist;
3031 struct lnet_route *route, *tmp;
3032 int sensitivity = lp->lp_health_sensitivity;
3034 INIT_LIST_HEAD(&rlist);
3036 lp->lp_state &= ~(LNET_PEER_DISCOVERING | LNET_PEER_FORCE_PING |
3037 LNET_PEER_FORCE_PUSH);
3038 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3039 libcfs_nid2str(lp->lp_primary_nid), lp, lp->lp_state);
3041 /* no-op if lnet_peer_del() has already been called on this peer */
3042 if (lp->lp_state & LNET_PEER_MARK_DELETED)
3045 if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
3048 spin_unlock(&lp->lp_lock);
3050 mutex_lock(&the_lnet.ln_api_mutex);
3052 lnet_net_lock(LNET_LOCK_EX);
3053 /* remove the peer from the discovery work
3054 * queue if it's on there in preparation
3057 if (!list_empty(&lp->lp_dc_list))
3058 list_del(&lp->lp_dc_list);
3059 list_for_each_entry_safe(route, tmp,
3062 lnet_move_route(route, NULL, &rlist);
3063 lnet_net_unlock(LNET_LOCK_EX);
3065 /* lnet_peer_del() deletes all the peer NIs owned by this peer */
3068 list_for_each_entry_safe(route, tmp,
3070 /* re-add these routes */
3071 lnet_add_route(route->lr_net,
3076 LIBCFS_FREE(route, sizeof(*route));
3079 mutex_unlock(&the_lnet.ln_api_mutex);
3081 spin_lock(&lp->lp_lock);
3087 * Update a peer using the data received.
3089 static int lnet_peer_data_present(struct lnet_peer *lp)
3090 __must_hold(&lp->lp_lock)
3092 struct lnet_ping_buffer *pbuf;
3093 struct lnet_peer_ni *lpni;
3094 lnet_nid_t nid = LNET_NID_ANY;
3100 lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
3101 lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
3102 spin_unlock(&lp->lp_lock);
3105 * Modifications of peer structures are done while holding the
3106 * ln_api_mutex. A global lock is required because we may be
3107 * modifying multiple peer structures, and a mutex greatly
3108 * simplifies memory management.
3110 * The actual changes to the data structures must also protect
3111 * against concurrent lookups, for which the lnet_net_lock in
3112 * LNET_LOCK_EX mode is used.
3114 mutex_lock(&the_lnet.ln_api_mutex);
3115 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
3121 * If this peer is not on the peer list then it is being torn
3122 * down, and our reference count may be all that is keeping it
3123 * alive. Don't do any work on it.
3125 if (list_empty(&lp->lp_peer_list))
3128 flags = LNET_PEER_DISCOVERED;
3129 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
3130 flags |= LNET_PEER_MULTI_RAIL;
3133 * Check whether the primary NID in the message matches the
3134 * primary NID of the peer. If it does, update the peer, if
3135 * it it does not, check whether there is already a peer with
3136 * that primary NID. If no such peer exists, try to update
3137 * the primary NID of the current peer (allowed if it was
3138 * created due to message traffic) and complete the update.
3139 * If the peer did exist, hand off the data to it.
3141 * The peer for the loopback interface is a special case: this
3142 * is the peer for the local node, and we want to set its
3143 * primary NID to the correct value here. Moreover, this peer
3144 * can show up with only the loopback NID in the ping buffer.
3146 if (pbuf->pb_info.pi_nnis <= 1)
3148 nid = pbuf->pb_info.pi_ni[1].ns_nid;
3149 if (lp->lp_primary_nid == LNET_NID_LO_0) {
3150 rc = lnet_peer_set_primary_nid(lp, nid, flags);
3152 rc = lnet_peer_merge_data(lp, pbuf);
3154 * if the primary nid of the peer is present in the ping info returned
3155 * from the peer, but it's not the local primary peer we have
3156 * cached and discovery is disabled, then we don't want to update
3157 * our local peer info, by adding or removing NIDs, we just want
3158 * to update the status of the nids that we currently have
3159 * recorded in that peer.
3161 } else if (lp->lp_primary_nid == nid ||
3162 (lnet_is_nid_in_ping_info(lp->lp_primary_nid, &pbuf->pb_info) &&
3163 lnet_is_discovery_disabled(lp))) {
3164 rc = lnet_peer_merge_data(lp, pbuf);
3166 lpni = lnet_find_peer_ni_locked(nid);
3167 if (!lpni || lp == lpni->lpni_peer_net->lpn_peer) {
3168 rc = lnet_peer_set_primary_nid(lp, nid, flags);
3170 CERROR("Primary NID error %s versus %s: %d\n",
3171 libcfs_nid2str(lp->lp_primary_nid),
3172 libcfs_nid2str(nid), rc);
3174 rc = lnet_peer_merge_data(lp, pbuf);
3177 lnet_peer_ni_decref_locked(lpni);
3179 struct lnet_peer *new_lp;
3180 new_lp = lpni->lpni_peer_net->lpn_peer;
3182 * if lp has discovery/MR enabled that means new_lp
3183 * should have discovery/MR enabled as well, since
3184 * it's the same peer, which we're about to merge
3186 spin_lock(&lp->lp_lock);
3187 spin_lock(&new_lp->lp_lock);
3188 if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
3189 new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
3190 if (lp->lp_state & LNET_PEER_MULTI_RAIL)
3191 new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
3192 /* If we're processing a ping reply then we may be
3193 * about to send a push to the peer that we ping'd.
3194 * Since the ping reply that we're processing was
3195 * received by lp, we need to set the discovery source
3196 * NID for new_lp to the NID stored in lp.
3198 if (lp->lp_disc_src_nid != LNET_NID_ANY)
3199 new_lp->lp_disc_src_nid = lp->lp_disc_src_nid;
3200 spin_unlock(&new_lp->lp_lock);
3201 spin_unlock(&lp->lp_lock);
3203 rc = lnet_peer_set_primary_data(new_lp, pbuf);
3204 lnet_consolidate_routes_locked(lp, new_lp);
3205 lnet_peer_ni_decref_locked(lpni);
3209 CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc,
3211 mutex_unlock(&the_lnet.ln_api_mutex);
3213 spin_lock(&lp->lp_lock);
3214 /* Tell discovery to re-check the peer immediately. */
3216 rc = LNET_REDISCOVER_PEER;
3221 * A ping failed. Clear the PING_FAILED state and set the
3222 * FORCE_PING state, to ensure a retry even if discovery is
3223 * disabled. This avoids being left with incorrect state.
3225 static int lnet_peer_ping_failed(struct lnet_peer *lp)
3226 __must_hold(&lp->lp_lock)
3228 struct lnet_handle_md mdh;
3231 mdh = lp->lp_ping_mdh;
3232 LNetInvalidateMDHandle(&lp->lp_ping_mdh);
3233 lp->lp_state &= ~LNET_PEER_PING_FAILED;
3234 lp->lp_state |= LNET_PEER_FORCE_PING;
3235 rc = lp->lp_ping_error;
3236 lp->lp_ping_error = 0;
3237 spin_unlock(&lp->lp_lock);
3239 if (!LNetMDHandleIsInvalid(mdh))
3242 CDEBUG(D_NET, "peer %s:%d\n",
3243 libcfs_nid2str(lp->lp_primary_nid), rc);
3245 spin_lock(&lp->lp_lock);
3246 return rc ? rc : LNET_REDISCOVER_PEER;
3250 * Select NID to send a Ping or Push to.
3252 static lnet_nid_t lnet_peer_select_nid(struct lnet_peer *lp)
3254 struct lnet_peer_ni *lpni;
3256 /* Look for a direct-connected NID for this peer. */
3258 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3259 if (!lnet_get_net_locked(lpni->lpni_peer_net->lpn_net_id))
3264 return lpni->lpni_nid;
3266 /* Look for a routed-connected NID for this peer. */
3268 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3269 if (!lnet_find_rnet_locked(lpni->lpni_peer_net->lpn_net_id))
3274 return lpni->lpni_nid;
3276 return LNET_NID_ANY;
3279 /* Active side of ping. */
3280 static int lnet_peer_send_ping(struct lnet_peer *lp)
3281 __must_hold(&lp->lp_lock)
3288 lp->lp_state |= LNET_PEER_PING_SENT;
3289 lp->lp_state &= ~LNET_PEER_FORCE_PING;
3290 spin_unlock(&lp->lp_lock);
3292 cpt = lnet_net_lock_current();
3293 /* Refcount for MD. */
3294 lnet_peer_addref_locked(lp);
3295 pnid = lnet_peer_select_nid(lp);
3296 lnet_net_unlock(cpt);
3298 nnis = max(lp->lp_data_nnis, LNET_INTERFACES_MIN);
3300 rc = lnet_send_ping(pnid, &lp->lp_ping_mdh, nnis, lp,
3301 the_lnet.ln_dc_handler, false);
3304 * if LNetMDBind in lnet_send_ping fails we need to decrement the
3305 * refcount on the peer, otherwise LNetMDUnlink will be called
3306 * which will eventually do that.
3310 lnet_peer_decref_locked(lp);
3311 lnet_net_unlock(cpt);
3312 rc = -rc; /* change the rc to negative value */
3314 } else if (rc < 0) {
3318 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3320 spin_lock(&lp->lp_lock);
3324 CDEBUG(D_NET, "peer %s: %d\n", libcfs_nid2str(lp->lp_primary_nid), rc);
3326 * The errors that get us here are considered hard errors and
3327 * cause Discovery to terminate. So we clear PING_SENT, but do
3328 * not set either PING_FAILED or FORCE_PING. In fact we need
3329 * to clear PING_FAILED, because the unlink event handler will
3330 * have set it if we called LNetMDUnlink() above.
3332 spin_lock(&lp->lp_lock);
3333 lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
3338 * This function exists because you cannot call LNetMDUnlink() from an
3341 static int lnet_peer_push_failed(struct lnet_peer *lp)
3342 __must_hold(&lp->lp_lock)
3344 struct lnet_handle_md mdh;
3347 mdh = lp->lp_push_mdh;
3348 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3349 lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
3350 rc = lp->lp_push_error;
3351 lp->lp_push_error = 0;
3352 spin_unlock(&lp->lp_lock);
3354 if (!LNetMDHandleIsInvalid(mdh))
3357 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3358 spin_lock(&lp->lp_lock);
3359 return rc ? rc : LNET_REDISCOVER_PEER;
3363 * Mark the peer as discovered.
3365 static int lnet_peer_discovered(struct lnet_peer *lp)
3366 __must_hold(&lp->lp_lock)
3368 lp->lp_state |= LNET_PEER_DISCOVERED;
3369 lp->lp_state &= ~(LNET_PEER_DISCOVERING |
3370 LNET_PEER_REDISCOVER);
3372 lp->lp_dc_error = 0;
3374 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3379 /* Active side of push. */
3380 static int lnet_peer_send_push(struct lnet_peer *lp)
3381 __must_hold(&lp->lp_lock)
3383 struct lnet_ping_buffer *pbuf;
3384 struct lnet_process_id id;
3389 /* Don't push to a non-multi-rail peer. */
3390 if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
3391 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3392 /* if peer's NIDs are uptodate then peer is discovered */
3393 if (lp->lp_state & LNET_PEER_NIDS_UPTODATE) {
3394 rc = lnet_peer_discovered(lp);
3401 lp->lp_state |= LNET_PEER_PUSH_SENT;
3402 lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
3403 spin_unlock(&lp->lp_lock);
3405 cpt = lnet_net_lock_current();
3406 pbuf = the_lnet.ln_ping_target;
3407 lnet_ping_buffer_addref(pbuf);
3408 lnet_net_unlock(cpt);
3410 /* Push source MD */
3411 md.start = &pbuf->pb_info;
3412 md.length = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
3413 md.threshold = 2; /* Put/Ack */
3415 md.options = LNET_MD_TRACK_RESPONSE;
3416 md.handler = the_lnet.ln_dc_handler;
3419 rc = LNetMDBind(&md, LNET_UNLINK, &lp->lp_push_mdh);
3421 lnet_ping_buffer_decref(pbuf);
3422 CERROR("Can't bind push source MD: %d\n", rc);
3425 cpt = lnet_net_lock_current();
3426 /* Refcount for MD. */
3427 lnet_peer_addref_locked(lp);
3428 id.pid = LNET_PID_LUSTRE;
3429 id.nid = lnet_peer_select_nid(lp);
3430 lnet_net_unlock(cpt);
3432 if (id.nid == LNET_NID_ANY) {
3437 rc = LNetPut(lp->lp_disc_src_nid, lp->lp_push_mdh,
3438 LNET_ACK_REQ, id, LNET_RESERVED_PORTAL,
3439 LNET_PROTO_PING_MATCHBITS, 0, 0);
3442 * reset the discovery nid. There is no need to restrict sending
3443 * from that source, if we call lnet_push_update_to_peers(). It'll
3444 * get set to a specific NID, if we initiate discovery from the
3447 lp->lp_disc_src_nid = LNET_NID_ANY;
3452 CDEBUG(D_NET, "peer %s\n", libcfs_nid2str(lp->lp_primary_nid));
3454 spin_lock(&lp->lp_lock);
3458 LNetMDUnlink(lp->lp_push_mdh);
3459 LNetInvalidateMDHandle(&lp->lp_push_mdh);
3461 CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nid2str(lp->lp_primary_nid), lp, rc);
3463 * The errors that get us here are considered hard errors and
3464 * cause Discovery to terminate. So we clear PUSH_SENT, but do
3465 * not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
3466 * because the unlink event handler will have set it if we
3467 * called LNetMDUnlink() above.
3469 spin_lock(&lp->lp_lock);
3470 lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
3475 * An unrecoverable error was encountered during discovery.
3476 * Set error status in peer and abort discovery.
3478 static void lnet_peer_discovery_error(struct lnet_peer *lp, int error)
3480 CDEBUG(D_NET, "Discovery error %s: %d\n",
3481 libcfs_nid2str(lp->lp_primary_nid), error);
3483 spin_lock(&lp->lp_lock);
3484 lp->lp_dc_error = error;
3485 lp->lp_state &= ~LNET_PEER_DISCOVERING;
3486 lp->lp_state |= LNET_PEER_REDISCOVER;
3487 spin_unlock(&lp->lp_lock);
3491 * Wait for work to be queued or some other change that must be
3492 * attended to. Returns non-zero if the discovery thread should shut
3495 static int lnet_peer_discovery_wait_for_work(void)
3502 cpt = lnet_net_lock_current();
3504 prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
3505 TASK_INTERRUPTIBLE);
3506 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3508 if (lnet_push_target_resize_needed() ||
3509 the_lnet.ln_push_target->pb_needs_post)
3511 if (!list_empty(&the_lnet.ln_dc_request))
3513 if (!list_empty(&the_lnet.ln_msg_resend))
3515 lnet_net_unlock(cpt);
3518 * wakeup max every second to check if there are peers that
3519 * have been stuck on the working queue for greater than
3522 schedule_timeout(cfs_time_seconds(1));
3523 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3524 cpt = lnet_net_lock_current();
3526 finish_wait(&the_lnet.ln_dc_waitq, &wait);
3528 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3531 lnet_net_unlock(cpt);
3533 CDEBUG(D_NET, "woken: %d\n", rc);
3539 * Messages that were pending on a destroyed peer will be put on a global
3540 * resend list. The message resend list will be checked by
3541 * the discovery thread when it wakes up, and will resend messages. These
3542 * messages can still be sendable in the case the lpni which was the initial
3543 * cause of the message re-queue was transfered to another peer.
3545 * It is possible that LNet could be shutdown while we're iterating
3546 * through the list. lnet_shudown_lndnets() will attempt to access the
3547 * resend list, but will have to wait until the spinlock is released, by
3548 * which time there shouldn't be any more messages on the resend list.
3549 * During shutdown lnet_send() will fail and lnet_finalize() will be called
3550 * for the messages so they can be released. The other case is that
3551 * lnet_shudown_lndnets() can finalize all the messages before this
3552 * function can visit the resend list, in which case this function will be
3555 static void lnet_resend_msgs(void)
3557 struct lnet_msg *msg, *tmp;
3561 spin_lock(&the_lnet.ln_msg_resend_lock);
3562 list_splice(&the_lnet.ln_msg_resend, &resend);
3563 spin_unlock(&the_lnet.ln_msg_resend_lock);
3565 list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
3566 list_del_init(&msg->msg_list);
3567 rc = lnet_send(msg->msg_src_nid_param, msg,
3568 msg->msg_rtr_nid_param);
3570 CNETERR("Error sending %s to %s: %d\n",
3571 lnet_msgtyp2str(msg->msg_type),
3572 libcfs_id2str(msg->msg_target), rc);
3573 lnet_finalize(msg, rc);
3578 /* The discovery thread. */
3579 static int lnet_peer_discovery(void *arg)
3581 struct lnet_peer *lp;
3584 wait_for_completion(&the_lnet.ln_started);
3586 CDEBUG(D_NET, "started\n");
3589 if (lnet_peer_discovery_wait_for_work())
3592 if (lnet_push_target_resize_needed())
3593 lnet_push_target_resize();
3594 else if (the_lnet.ln_push_target->pb_needs_post)
3595 lnet_push_target_post(the_lnet.ln_push_target,
3596 &the_lnet.ln_push_target_md);
3600 lnet_net_lock(LNET_LOCK_EX);
3601 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING) {
3602 lnet_net_unlock(LNET_LOCK_EX);
3607 * Process all incoming discovery work requests. When
3608 * discovery must wait on a peer to change state, it
3609 * is added to the tail of the ln_dc_working queue. A
3610 * timestamp keeps track of when the peer was added,
3611 * so we can time out discovery requests that take too
3614 while (!list_empty(&the_lnet.ln_dc_request)) {
3615 lp = list_first_entry(&the_lnet.ln_dc_request,
3616 struct lnet_peer, lp_dc_list);
3617 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
3619 * set the time the peer was put on the dc_working
3620 * queue. It shouldn't remain on the queue
3621 * forever, in case the GET message (for ping)
3622 * doesn't get a REPLY or the PUT message (for
3623 * push) doesn't get an ACK.
3625 lp->lp_last_queued = ktime_get_real_seconds();
3626 lnet_net_unlock(LNET_LOCK_EX);
3628 if (lnet_push_target_resize_needed())
3629 lnet_push_target_resize();
3630 else if (the_lnet.ln_push_target->pb_needs_post)
3631 lnet_push_target_post(the_lnet.ln_push_target,
3632 &the_lnet.ln_push_target_md);
3635 * Select an action depending on the state of
3636 * the peer and whether discovery is disabled.
3637 * The check whether discovery is disabled is
3638 * done after the code that handles processing
3639 * for arrived data, cleanup for failures, and
3640 * forcing a Ping or Push.
3642 spin_lock(&lp->lp_lock);
3643 CDEBUG(D_NET, "peer %s(%p) state %#x\n",
3644 libcfs_nid2str(lp->lp_primary_nid), lp,
3646 if (lp->lp_state & (LNET_PEER_MARK_DELETION |
3647 LNET_PEER_MARK_DELETED))
3648 rc = lnet_peer_deletion(lp);
3649 else if (lp->lp_state & LNET_PEER_DATA_PRESENT)
3650 rc = lnet_peer_data_present(lp);
3651 else if (lp->lp_state & LNET_PEER_PING_FAILED)
3652 rc = lnet_peer_ping_failed(lp);
3653 else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
3654 rc = lnet_peer_push_failed(lp);
3655 else if (lp->lp_state & LNET_PEER_FORCE_PING)
3656 rc = lnet_peer_send_ping(lp);
3657 else if (lp->lp_state & LNET_PEER_FORCE_PUSH)
3658 rc = lnet_peer_send_push(lp);
3659 else if (!(lp->lp_state & LNET_PEER_NIDS_UPTODATE))
3660 rc = lnet_peer_send_ping(lp);
3661 else if (lnet_peer_needs_push(lp))
3662 rc = lnet_peer_send_push(lp);
3664 rc = lnet_peer_discovered(lp);
3665 CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
3666 libcfs_nid2str(lp->lp_primary_nid), lp,
3668 spin_unlock(&lp->lp_lock);
3670 lnet_net_lock(LNET_LOCK_EX);
3671 if (rc == LNET_REDISCOVER_PEER) {
3672 list_move(&lp->lp_dc_list,
3673 &the_lnet.ln_dc_request);
3675 lnet_peer_discovery_error(lp, rc);
3677 if (!(lp->lp_state & LNET_PEER_DISCOVERING))
3678 lnet_peer_discovery_complete(lp);
3679 if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
3684 lnet_net_unlock(LNET_LOCK_EX);
3687 CDEBUG(D_NET, "stopping\n");
3689 * Clean up before telling lnet_peer_discovery_stop() that
3690 * we're done. Use wake_up() below to somewhat reduce the
3691 * size of the thundering herd if there are multiple threads
3692 * waiting on discovery of a single peer.
3695 /* Queue cleanup 1: stop all pending pings and pushes. */
3696 lnet_net_lock(LNET_LOCK_EX);
3697 while (!list_empty(&the_lnet.ln_dc_working)) {
3698 lp = list_first_entry(&the_lnet.ln_dc_working,
3699 struct lnet_peer, lp_dc_list);
3700 list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
3701 lnet_net_unlock(LNET_LOCK_EX);
3702 lnet_peer_cancel_discovery(lp);
3703 lnet_net_lock(LNET_LOCK_EX);
3705 lnet_net_unlock(LNET_LOCK_EX);
3707 /* Queue cleanup 2: wait for the expired queue to clear. */
3708 while (!list_empty(&the_lnet.ln_dc_expired))
3709 schedule_timeout_uninterruptible(cfs_time_seconds(1));
3711 /* Queue cleanup 3: clear the request queue. */
3712 lnet_net_lock(LNET_LOCK_EX);
3713 while (!list_empty(&the_lnet.ln_dc_request)) {
3714 lp = list_first_entry(&the_lnet.ln_dc_request,
3715 struct lnet_peer, lp_dc_list);
3716 lnet_peer_discovery_error(lp, -ESHUTDOWN);
3717 lnet_peer_discovery_complete(lp);
3719 lnet_net_unlock(LNET_LOCK_EX);
3721 lnet_assert_handler_unused(the_lnet.ln_dc_handler);
3722 the_lnet.ln_dc_handler = NULL;
3724 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3725 wake_up(&the_lnet.ln_dc_waitq);
3727 CDEBUG(D_NET, "stopped\n");
3732 /* ln_api_mutex is held on entry. */
3733 int lnet_peer_discovery_start(void)
3735 struct task_struct *task;
3738 if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
3741 the_lnet.ln_dc_handler = lnet_discovery_event_handler;
3742 the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
3743 task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
3746 CERROR("Can't start peer discovery thread: %d\n", rc);
3748 the_lnet.ln_dc_handler = NULL;
3750 the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
3753 CDEBUG(D_NET, "discovery start: %d\n", rc);
3758 /* ln_api_mutex is held on entry. */
3759 void lnet_peer_discovery_stop(void)
3761 if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
3764 LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
3765 the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
3767 /* In the LNetNIInit() path we may be stopping discovery before it
3768 * entered its work loop
3770 if (!completion_done(&the_lnet.ln_started))
3771 complete(&the_lnet.ln_started);
3773 wake_up(&the_lnet.ln_dc_waitq);
3775 wait_event(the_lnet.ln_dc_waitq,
3776 the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
3778 LASSERT(list_empty(&the_lnet.ln_dc_request));
3779 LASSERT(list_empty(&the_lnet.ln_dc_working));
3780 LASSERT(list_empty(&the_lnet.ln_dc_expired));
3782 CDEBUG(D_NET, "discovery stopped\n");
3788 lnet_debug_peer(lnet_nid_t nid)
3790 char *aliveness = "NA";
3791 struct lnet_peer_ni *lp;
3794 cpt = lnet_cpt_of_nid(nid, NULL);
3797 lp = lnet_nid2peerni_locked(nid, LNET_NID_ANY, cpt);
3799 lnet_net_unlock(cpt);
3800 CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid));
3804 if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
3805 aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
3807 CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
3808 libcfs_nid2str(lp->lpni_nid), kref_read(&lp->lpni_kref),
3809 aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
3810 lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
3811 lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
3813 lnet_peer_ni_decref_locked(lp);
3815 lnet_net_unlock(cpt);
3818 /* Gathering information for userspace. */
3820 int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
3821 char aliveness[LNET_MAX_STR_LEN],
3822 __u32 *cpt_iter, __u32 *refcount,
3823 __u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
3824 __u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
3825 __u32 *peer_tx_qnob)
3827 struct lnet_peer_table *peer_table;
3828 struct lnet_peer_ni *lp;
3833 /* get the number of CPTs */
3834 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
3836 /* if the cpt number to be examined is >= the number of cpts in
3837 * the system then indicate that there are no more cpts to examin
3839 if (*cpt_iter >= lncpt)
3842 /* get the current table */
3843 peer_table = the_lnet.ln_peer_tables[*cpt_iter];
3844 /* if the ptable is NULL then there are no more cpts to examine */
3845 if (peer_table == NULL)
3848 lnet_net_lock(*cpt_iter);
3850 for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
3851 struct list_head *peers = &peer_table->pt_hash[j];
3853 list_for_each_entry(lp, peers, lpni_hashlist) {
3854 if (peer_index-- > 0)
3857 snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
3858 if (lnet_isrouter(lp) ||
3859 lnet_peer_aliveness_enabled(lp))
3860 snprintf(aliveness, LNET_MAX_STR_LEN,
3861 lnet_is_peer_ni_alive(lp) ? "up" : "down");
3863 *nid = lp->lpni_nid;
3864 *refcount = kref_read(&lp->lpni_kref);
3865 *ni_peer_tx_credits =
3866 lp->lpni_net->net_tunables.lct_peer_tx_credits;
3867 *peer_tx_credits = lp->lpni_txcredits;
3868 *peer_rtr_credits = lp->lpni_rtrcredits;
3869 *peer_min_rtr_credits = lp->lpni_mintxcredits;
3870 *peer_tx_qnob = lp->lpni_txqnob;
3876 lnet_net_unlock(*cpt_iter);
3880 return found ? 0 : -ENOENT;
3883 /* ln_api_mutex is held, which keeps the peer list stable */
3884 int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
3886 struct lnet_ioctl_element_stats *lpni_stats;
3887 struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
3888 struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
3889 struct lnet_peer_ni_credit_info *lpni_info;
3890 struct lnet_peer_ni *lpni;
3891 struct lnet_peer *lp;
3896 lp = lnet_find_peer(cfg->prcfg_prim_nid);
3903 size = sizeof(nid) + sizeof(*lpni_info) + sizeof(*lpni_stats)
3904 + sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
3905 size *= lp->lp_nnis;
3906 if (size > cfg->prcfg_size) {
3907 cfg->prcfg_size = size;
3912 cfg->prcfg_prim_nid = lp->lp_primary_nid;
3913 cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
3914 cfg->prcfg_cfg_nid = lp->lp_primary_nid;
3915 cfg->prcfg_count = lp->lp_nnis;
3916 cfg->prcfg_size = size;
3917 cfg->prcfg_state = lp->lp_state;
3919 /* Allocate helper buffers. */
3921 LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
3924 LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
3927 LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
3928 if (!lpni_msg_stats)
3929 goto out_free_stats;
3930 LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
3932 goto out_free_msg_stats;
3937 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
3938 nid = lpni->lpni_nid;
3939 if (copy_to_user(bulk, &nid, sizeof(nid)))
3940 goto out_free_hstats;
3941 bulk += sizeof(nid);
3943 memset(lpni_info, 0, sizeof(*lpni_info));
3944 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
3945 if (lnet_isrouter(lpni) ||
3946 lnet_peer_aliveness_enabled(lpni))
3947 snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
3948 lnet_is_peer_ni_alive(lpni) ? "up" : "down");
3950 lpni_info->cr_refcount = kref_read(&lpni->lpni_kref);
3951 lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
3952 lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
3953 lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
3954 lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
3955 lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
3956 lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
3957 lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
3958 if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
3959 goto out_free_hstats;
3960 bulk += sizeof(*lpni_info);
3962 memset(lpni_stats, 0, sizeof(*lpni_stats));
3963 lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
3964 LNET_STATS_TYPE_SEND);
3965 lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
3966 LNET_STATS_TYPE_RECV);
3967 lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
3968 LNET_STATS_TYPE_DROP);
3969 if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
3970 goto out_free_hstats;
3971 bulk += sizeof(*lpni_stats);
3972 lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
3973 if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
3974 goto out_free_hstats;
3975 bulk += sizeof(*lpni_msg_stats);
3976 lpni_hstats->hlpni_network_timeout =
3977 atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
3978 lpni_hstats->hlpni_remote_dropped =
3979 atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
3980 lpni_hstats->hlpni_remote_timeout =
3981 atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
3982 lpni_hstats->hlpni_remote_error =
3983 atomic_read(&lpni->lpni_hstats.hlt_remote_error);
3984 lpni_hstats->hlpni_health_value =
3985 atomic_read(&lpni->lpni_healthv);
3986 if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
3987 goto out_free_hstats;
3988 bulk += sizeof(*lpni_hstats);
3993 LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
3995 LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
3997 LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
3999 LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
4001 lnet_peer_decref_locked(lp);
4006 /* must hold net_lock/0 */
4008 lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni,
4009 struct list_head *recovery_queue,
4012 /* the mt could've shutdown and cleaned up the queues */
4013 if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
4016 if (!list_empty(&lpni->lpni_recovery))
4019 if (atomic_read(&lpni->lpni_healthv) == LNET_MAX_HEALTH_VALUE)
4022 if (!lpni->lpni_last_alive) {
4024 "lpni %s(%p) not eligible for recovery last alive %lld\n",
4025 libcfs_nid2str(lpni->lpni_nid), lpni,
4026 lpni->lpni_last_alive);
4030 if (now > lpni->lpni_last_alive + lnet_recovery_limit) {
4031 CDEBUG(D_NET, "lpni %s aged out last alive %lld\n",
4032 libcfs_nid2str(lpni->lpni_nid),
4033 lpni->lpni_last_alive);
4034 /* Reset the ping count so that if this peer NI is added back to
4035 * the recovery queue we will send the first ping right away.
4037 lpni->lpni_ping_count = 0;
4041 /* This peer NI is going on the recovery queue, so take a ref on it */
4042 lnet_peer_ni_addref_locked(lpni);
4044 lnet_peer_ni_set_next_ping(lpni, now);
4046 CDEBUG(D_NET, "%s added to recovery queue. ping count: %u next ping: %lld last alive: %lld health: %d\n",
4047 libcfs_nid2str(lpni->lpni_nid),
4048 lpni->lpni_ping_count,
4049 lpni->lpni_next_ping,
4050 lpni->lpni_last_alive,
4051 atomic_read(&lpni->lpni_healthv));
4053 list_add_tail(&lpni->lpni_recovery, recovery_queue);
4056 /* Call with the ln_api_mutex held */
4058 lnet_peer_ni_set_healthv(lnet_nid_t nid, int value, bool all)
4060 struct lnet_peer_table *ptable;
4061 struct lnet_peer *lp;
4062 struct lnet_peer_net *lpn;
4063 struct lnet_peer_ni *lpni;
4068 if (the_lnet.ln_state != LNET_STATE_RUNNING)
4071 now = ktime_get_seconds();
4074 lnet_net_lock(LNET_LOCK_EX);
4075 lpni = lnet_find_peer_ni_locked(nid);
4077 lnet_net_unlock(LNET_LOCK_EX);
4080 atomic_set(&lpni->lpni_healthv, value);
4081 lnet_peer_ni_add_to_recoveryq_locked(lpni,
4082 &the_lnet.ln_mt_peerNIRecovq, now);
4083 lnet_peer_ni_decref_locked(lpni);
4084 lnet_net_unlock(LNET_LOCK_EX);
4088 lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
4091 * Walk all the peers and reset the health value for each one to the
4094 lnet_net_lock(LNET_LOCK_EX);
4095 for (cpt = 0; cpt < lncpt; cpt++) {
4096 ptable = the_lnet.ln_peer_tables[cpt];
4097 list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
4098 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
4099 list_for_each_entry(lpni, &lpn->lpn_peer_nis,
4101 atomic_set(&lpni->lpni_healthv, value);
4102 lnet_peer_ni_add_to_recoveryq_locked(lpni,
4103 &the_lnet.ln_mt_peerNIRecovq, now);
4108 lnet_net_unlock(LNET_LOCK_EX);