2 * Copyright (C) 2012 Cray, Inc.
4 * Copyright (c) 2013, 2017, Intel Corporation.
6 * Author: Nic Henke <nic@cray.com>
7 * Author: James Shimek <jshimek@cray.com>
9 * This file is part of Lustre, http://www.lustre.org.
11 * Lustre is free software; you can redistribute it and/or
12 * modify it under the terms of version 2 of the GNU General Public
13 * License as published by the Free Software Foundation.
15 * Lustre is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with Lustre; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 /* Primary entry points from LNET. There are no guarantees against reentrance. */
28 const struct lnet_lnd the_kgnilnd = {
30 .lnd_startup = kgnilnd_startup,
31 .lnd_shutdown = kgnilnd_shutdown,
32 .lnd_ctl = kgnilnd_ctl,
33 .lnd_send = kgnilnd_send,
34 .lnd_recv = kgnilnd_recv,
35 .lnd_eager_recv = kgnilnd_eager_recv,
38 kgn_data_t kgnilnd_data;
41 kgnilnd_thread_start(int(*fn)(void *arg), void *arg, char *name, int id)
43 struct task_struct *thrd;
45 thrd = kthread_run(fn, arg, "%s_%02d", name, id);
49 atomic_inc(&kgnilnd_data.kgn_nthreads);
53 /* bind scheduler threads to cpus */
55 kgnilnd_start_sd_threads(void)
59 struct task_struct *task;
61 for_each_online_cpu(cpu) {
62 /* don't bind to cpu 0 - all interrupts are processed here */
66 task = kthread_create(kgnilnd_scheduler, (void *)((long)i),
67 "%s_%02d", "kgnilnd_sd", i);
69 kthread_bind(task, cpu);
70 wake_up_process(task);
72 CERROR("Can't spawn gnilnd scheduler[%d] %ld\n", i,
76 atomic_inc(&kgnilnd_data.kgn_nthreads);
78 if (++i >= *kgnilnd_tunables.kgn_sched_threads) {
86 /* needs write_lock on kgn_peer_conn_lock */
88 kgnilnd_close_stale_conns_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
91 struct list_head *ctmp, *cnxt;
95 loopback = peer->gnp_nid == peer->gnp_net->gnn_ni->ni_nid;
97 list_for_each_safe(ctmp, cnxt, &peer->gnp_conns) {
98 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
100 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
106 if (conn->gnc_device != newconn->gnc_device)
109 /* This is a two connection loopback - one talking to the other */
111 newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
112 newconn->gnc_peer_connstamp == conn->gnc_my_connstamp) {
113 CDEBUG(D_NET, "skipping prune of %p, "
114 "loopback and matching stamps"
115 " connstamp %llu(%llu)"
116 " peerstamp %llu(%llu)\n",
117 conn, newconn->gnc_my_connstamp,
118 conn->gnc_peer_connstamp,
119 newconn->gnc_peer_connstamp,
120 conn->gnc_my_connstamp);
124 if (conn->gnc_peerstamp != newconn->gnc_peerstamp) {
125 LASSERTF(conn->gnc_peerstamp < newconn->gnc_peerstamp,
126 "conn 0x%p peerstamp %llu >= "
127 "newconn 0x%p peerstamp %llu\n",
128 conn, conn->gnc_peerstamp,
129 newconn, newconn->gnc_peerstamp);
131 CDEBUG(D_NET, "Closing stale conn nid: %s "
132 " peerstamp:%#llx(%#llx)\n",
133 libcfs_nid2str(peer->gnp_nid),
134 conn->gnc_peerstamp, newconn->gnc_peerstamp);
137 LASSERTF(conn->gnc_peer_connstamp < newconn->gnc_peer_connstamp,
138 "conn 0x%p peer_connstamp %llu >= "
139 "newconn 0x%p peer_connstamp %llu\n",
140 conn, conn->gnc_peer_connstamp,
141 newconn, newconn->gnc_peer_connstamp);
143 CDEBUG(D_NET, "Closing stale conn nid: %s"
144 " connstamp:%llu(%llu)\n",
145 libcfs_nid2str(peer->gnp_nid),
146 conn->gnc_peer_connstamp, newconn->gnc_peer_connstamp);
150 kgnilnd_close_conn_locked(conn, -ESTALE);
154 CWARN("Closed %d stale conns to %s\n", count, libcfs_nid2str(peer->gnp_nid));
161 kgnilnd_conn_isdup_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
164 struct list_head *tmp;
168 loopback = peer->gnp_nid == peer->gnp_net->gnn_ni->ni_nid;
170 list_for_each(tmp, &peer->gnp_conns) {
171 conn = list_entry(tmp, kgn_conn_t, gnc_list);
172 CDEBUG(D_NET, "checking conn 0x%p for peer %s"
173 " lo %d new %llu existing %llu"
174 " new peer %llu existing peer %llu"
175 " new dev %p existing dev %p\n",
176 conn, libcfs_nid2str(peer->gnp_nid),
178 newconn->gnc_peerstamp, conn->gnc_peerstamp,
179 newconn->gnc_peer_connstamp, conn->gnc_peer_connstamp,
180 newconn->gnc_device, conn->gnc_device);
182 /* conn is in the process of closing */
183 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
186 /* 'newconn' is from an earlier version of 'peer'!!! */
187 if (newconn->gnc_peerstamp < conn->gnc_peerstamp)
190 /* 'conn' is from an earlier version of 'peer': it will be
191 * removed when we cull stale conns later on... */
192 if (newconn->gnc_peerstamp > conn->gnc_peerstamp)
195 /* Different devices are OK */
196 if (conn->gnc_device != newconn->gnc_device)
199 /* It's me connecting to myself */
201 newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
202 newconn->gnc_peer_connstamp == conn->gnc_my_connstamp)
205 /* 'newconn' is an earlier connection from 'peer'!!! */
206 if (newconn->gnc_peer_connstamp < conn->gnc_peer_connstamp)
209 /* 'conn' is an earlier connection from 'peer': it will be
210 * removed when we cull stale conns later on... */
211 if (newconn->gnc_peer_connstamp > conn->gnc_peer_connstamp)
214 /* 'newconn' has the SAME connection stamp; 'peer' isn't
215 * playing the game... */
223 kgnilnd_create_conn(kgn_conn_t **connp, kgn_device_t *dev)
229 LASSERT (!in_interrupt());
230 atomic_inc(&kgnilnd_data.kgn_nconns);
232 /* divide by 2 to allow for complete reset and immediate reconnect */
233 if (atomic_read(&kgnilnd_data.kgn_nconns) >= GNILND_MAX_CQID/2) {
234 CERROR("Too many conn are live: %d > %d\n",
235 atomic_read(&kgnilnd_data.kgn_nconns), GNILND_MAX_CQID/2);
236 atomic_dec(&kgnilnd_data.kgn_nconns);
240 LIBCFS_ALLOC(conn, sizeof(*conn));
242 atomic_dec(&kgnilnd_data.kgn_nconns);
246 conn->gnc_tx_ref_table =
247 kgnilnd_vzalloc(GNILND_MAX_MSG_ID * sizeof(void *));
248 if (conn->gnc_tx_ref_table == NULL) {
249 CERROR("Can't allocate conn tx_ref_table\n");
250 GOTO(failed, rc = -ENOMEM);
253 mutex_init(&conn->gnc_smsg_mutex);
254 mutex_init(&conn->gnc_rdma_mutex);
255 atomic_set(&conn->gnc_refcount, 1);
256 atomic_set(&conn->gnc_reaper_noop, 0);
257 atomic_set(&conn->gnc_sched_noop, 0);
258 atomic_set(&conn->gnc_tx_in_use, 0);
259 INIT_LIST_HEAD(&conn->gnc_list);
260 INIT_LIST_HEAD(&conn->gnc_hashlist);
261 INIT_LIST_HEAD(&conn->gnc_schedlist);
262 INIT_LIST_HEAD(&conn->gnc_fmaq);
263 INIT_LIST_HEAD(&conn->gnc_mdd_list);
264 INIT_LIST_HEAD(&conn->gnc_delaylist);
265 spin_lock_init(&conn->gnc_list_lock);
266 spin_lock_init(&conn->gnc_tx_lock);
267 conn->gnc_magic = GNILND_CONN_MAGIC;
269 /* set tx id to nearly the end to make sure we find wrapping
271 conn->gnc_next_tx = (int) GNILND_MAX_MSG_ID - 10;
273 /* if this fails, we have conflicts and MAX_TX is too large */
274 BUILD_BUG_ON(GNILND_MAX_MSG_ID >= GNILND_MSGID_CLOSE);
276 /* get a new unique CQ id for this conn */
277 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
278 conn->gnc_my_connstamp = kgnilnd_data.kgn_connstamp++;
279 conn->gnc_cqid = kgnilnd_get_cqid_locked();
280 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
282 if (conn->gnc_cqid == 0) {
283 CERROR("Could not allocate unique CQ ID for conn 0x%p\n", conn);
284 GOTO(failed, rc = -E2BIG);
287 CDEBUG(D_NET, "alloc cqid %u for conn 0x%p\n",
288 conn->gnc_cqid, conn);
290 /* need to be set before gnc_ephandle to allow kgnilnd_destroy_conn_ep to
292 conn->gnc_device = dev;
294 conn->gnc_timeout = max(*kgnilnd_tunables.kgn_timeout,
296 kgnilnd_update_reaper_timeout(conn->gnc_timeout);
298 /* this is the ep_handle for doing SMSG & BTE */
299 mutex_lock(&dev->gnd_cq_mutex);
300 rrc = kgnilnd_ep_create(dev->gnd_handle, dev->gnd_snd_fma_cqh,
301 &conn->gnc_ephandle);
302 mutex_unlock(&dev->gnd_cq_mutex);
303 if (rrc != GNI_RC_SUCCESS)
304 GOTO(failed, rc = -ENETDOWN);
306 CDEBUG(D_NET, "created conn 0x%p ep_hndl 0x%p\n",
307 conn, conn->gnc_ephandle);
309 /* add ref for EP canceling */
310 kgnilnd_conn_addref(conn);
311 atomic_inc(&dev->gnd_neps);
317 atomic_dec(&kgnilnd_data.kgn_nconns);
318 kgnilnd_vfree(conn->gnc_tx_ref_table,
319 GNILND_MAX_MSG_ID * sizeof(void *));
320 LIBCFS_FREE(conn, sizeof(*conn));
324 /* needs to be called with kgn_peer_conn_lock held (read or write) */
326 kgnilnd_find_conn_locked(kgn_peer_t *peer)
328 kgn_conn_t *conn = NULL;
330 /* if we are in reset, this conn is going to die soon */
331 if (unlikely(kgnilnd_data.kgn_in_reset)) {
335 /* just return the first ESTABLISHED connection */
336 list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
337 /* kgnilnd_finish_connect doesn't put connections on the
338 * peer list until they are actually established */
339 LASSERTF(conn->gnc_state >= GNILND_CONN_ESTABLISHED,
340 "found conn %p state %s on peer %p (%s)\n",
341 conn, kgnilnd_conn_state2str(conn), peer,
342 libcfs_nid2str(peer->gnp_nid));
343 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
351 /* needs write_lock on kgn_peer_conn_lock held */
353 kgnilnd_find_or_create_conn_locked(kgn_peer_t *peer) {
355 kgn_device_t *dev = peer->gnp_net->gnn_dev;
358 conn = kgnilnd_find_conn_locked(peer);
364 /* if the peer was previously connecting, check if we should
365 * trigger another connection attempt yet. */
366 if (time_before(jiffies, peer->gnp_reconnect_time)) {
370 /* This check prevents us from creating a new connection to a peer while we are
371 * still in the process of closing an existing connection to the peer.
373 list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
374 if (conn->gnc_ephandle != NULL) {
375 CDEBUG(D_NET, "Not connecting non-null ephandle found peer 0x%p->%s\n", peer,
376 libcfs_nid2str(peer->gnp_nid));
381 if (peer->gnp_connecting != GNILND_PEER_IDLE) {
382 /* if we are not connecting, fire up a new connection */
383 /* or if we are anything but IDLE DONT start a new connection */
387 CDEBUG(D_NET, "starting connect to %s\n",
388 libcfs_nid2str(peer->gnp_nid));
389 peer->gnp_connecting = GNILND_PEER_CONNECT;
390 kgnilnd_peer_addref(peer); /* extra ref for connd */
392 spin_lock(&dev->gnd_connd_lock);
393 list_add_tail(&peer->gnp_connd_list, &dev->gnd_connd_peers);
394 spin_unlock(&dev->gnd_connd_lock);
396 kgnilnd_schedule_dgram(dev);
397 CDEBUG(D_NETTRACE, "scheduling new connect\n");
402 /* Caller is responsible for deciding if/when to call this */
404 kgnilnd_destroy_conn_ep(kgn_conn_t *conn)
407 gni_ep_handle_t tmp_ep;
409 /* only if we actually initialized it,
410 * then set NULL to tell kgnilnd_destroy_conn to leave it alone */
412 tmp_ep = xchg(&conn->gnc_ephandle, NULL);
413 if (tmp_ep != NULL) {
414 /* we never re-use the EP, so unbind is not needed */
415 mutex_lock(&conn->gnc_device->gnd_cq_mutex);
416 rrc = kgnilnd_ep_destroy(tmp_ep);
418 mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
420 /* if this fails, it could hork up kgni smsg retransmit and others
421 * since we could free the SMSG mbox memory, etc. */
422 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d conn 0x%p ep 0x%p\n",
423 rrc, conn, conn->gnc_ephandle);
425 atomic_dec(&conn->gnc_device->gnd_neps);
427 /* clear out count added in kgnilnd_close_conn_locked
428 * conn will have a peer once it hits finish_connect, where it
429 * is the first spot we'll mark it ESTABLISHED as well */
430 if (conn->gnc_peer) {
431 kgnilnd_admin_decref(conn->gnc_peer->gnp_dirty_eps);
434 /* drop ref for EP */
435 kgnilnd_conn_decref(conn);
440 kgnilnd_destroy_conn(kgn_conn_t *conn)
442 LASSERTF(!in_interrupt() &&
443 !conn->gnc_scheduled &&
444 !conn->gnc_in_purgatory &&
445 conn->gnc_ephandle == NULL &&
446 list_empty(&conn->gnc_list) &&
447 list_empty(&conn->gnc_hashlist) &&
448 list_empty(&conn->gnc_schedlist) &&
449 list_empty(&conn->gnc_mdd_list) &&
450 list_empty(&conn->gnc_delaylist) &&
451 conn->gnc_magic == GNILND_CONN_MAGIC,
452 "conn 0x%p->%s IRQ %d sched %d purg %d ep 0x%p Mg %d lists %d/%d/%d/%d/%d\n",
453 conn, conn->gnc_peer ? libcfs_nid2str(conn->gnc_peer->gnp_nid)
455 !!in_interrupt(), conn->gnc_scheduled,
456 conn->gnc_in_purgatory,
459 list_empty(&conn->gnc_list),
460 list_empty(&conn->gnc_hashlist),
461 list_empty(&conn->gnc_schedlist),
462 list_empty(&conn->gnc_mdd_list),
463 list_empty(&conn->gnc_delaylist));
465 /* Tripping these is especially bad, as it means we have items on the
466 * lists that didn't keep their refcount on the connection - or
467 * somebody evil released their own */
468 LASSERTF(list_empty(&conn->gnc_fmaq) &&
469 atomic_read(&conn->gnc_nlive_fma) == 0 &&
470 atomic_read(&conn->gnc_nlive_rdma) == 0,
471 "conn 0x%p fmaq %d@0x%p nfma %d nrdma %d\n",
472 conn, kgnilnd_count_list(&conn->gnc_fmaq), &conn->gnc_fmaq,
473 atomic_read(&conn->gnc_nlive_fma), atomic_read(&conn->gnc_nlive_rdma));
475 CDEBUG(D_NET, "destroying conn %p ephandle %p error %d\n",
476 conn, conn->gnc_ephandle, conn->gnc_error);
478 /* We are freeing this memory remove the magic value from the connection */
481 /* if there is an FMA blk left here, we'll tear it down */
482 if (conn->gnc_fma_blk) {
483 if (conn->gnc_peer) {
484 kgn_mbox_info_t *mbox;
485 mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
486 mbox->mbx_prev_nid = conn->gnc_peer->gnp_nid;
488 kgnilnd_release_mbox(conn, 0);
491 if (conn->gnc_peer != NULL)
492 kgnilnd_peer_decref(conn->gnc_peer);
494 if (conn->gnc_tx_ref_table != NULL) {
495 kgnilnd_vfree(conn->gnc_tx_ref_table,
496 GNILND_MAX_MSG_ID * sizeof(void *));
499 LIBCFS_FREE(conn, sizeof(*conn));
500 atomic_dec(&kgnilnd_data.kgn_nconns);
503 /* peer_alive and peer_notify done in the style of the o2iblnd */
505 kgnilnd_peer_alive(kgn_peer_t *peer)
507 time64_t now = ktime_get_seconds();
509 set_mb(peer->gnp_last_alive, now);
513 kgnilnd_peer_notify(kgn_peer_t *peer, int error, int alive)
524 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DONT_NOTIFY))
527 /* Tell LNet we are giving ups on this peer - but only
528 * if it isn't already reconnected or trying to reconnect */
529 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
531 /* use kgnilnd_find_conn_locked to avoid any conns in the process of being nuked
533 * don't tell LNet if we are in reset - we assume that everyone will be able to
534 * reconnect just fine
536 conn = kgnilnd_find_conn_locked(peer);
538 CDEBUG(D_NETTRACE, "peer 0x%p->%s ting %d conn 0x%p, rst %d error %d\n",
539 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting, conn,
540 kgnilnd_data.kgn_in_reset, error);
542 if (((peer->gnp_connecting == GNILND_PEER_IDLE) &&
544 (!kgnilnd_data.kgn_in_reset) &&
545 (!kgnilnd_conn_clean_errno(error))) || alive) {
549 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
552 /* short circuit if we dont need to notify Lnet */
556 rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
559 /* dont do this if this fails since LNET is in shutdown or something else
562 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
563 list_for_each_entry(net , &kgnilnd_data.kgn_nets[i], gnn_list) {
564 /* if gnn_shutdown set for any net shutdown is in progress just return */
565 if (net->gnn_shutdown) {
566 up_read(&kgnilnd_data.kgn_net_rw_sem);
574 /* shutdown in progress most likely */
575 up_read(&kgnilnd_data.kgn_net_rw_sem);
579 CFS_ALLOC_PTR_ARRAY(nets, nnets);
582 up_read(&kgnilnd_data.kgn_net_rw_sem);
583 CERROR("Failed to allocate nets[%d]\n", nnets);
588 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
589 list_for_each_entry(net, &kgnilnd_data.kgn_nets[i], gnn_list) {
591 kgnilnd_net_addref(net);
595 up_read(&kgnilnd_data.kgn_net_rw_sem);
597 for (i = 0; i < nnets; i++) {
602 peer_nid = kgnilnd_lnd2lnetnid(net->gnn_ni->ni_nid,
605 CDEBUG(D_NET, "peer 0x%p->%s last_alive %lld (%llds ago)\n",
606 peer, libcfs_nid2str(peer_nid), peer->gnp_last_alive,
607 ktime_get_seconds() - peer->gnp_last_alive);
609 lnet_notify(net->gnn_ni, peer_nid, alive,
610 (alive) ? true : false,
611 peer->gnp_last_alive);
613 kgnilnd_net_decref(net);
616 CFS_FREE_PTR_ARRAY(nets, nnets);
620 /* need write_lock on kgn_peer_conn_lock */
622 kgnilnd_close_conn_locked(kgn_conn_t *conn, int error)
624 kgn_peer_t *peer = conn->gnc_peer;
627 LASSERT(!in_interrupt());
629 /* store error for tx completion */
630 conn->gnc_error = error;
631 peer->gnp_last_errno = error;
633 /* use real error from peer if possible */
634 if (error == -ECONNRESET) {
635 error = conn->gnc_peer_error;
638 /* if we NETERROR, make sure it is rate limited */
639 if (!kgnilnd_conn_clean_errno(error) &&
640 peer->gnp_state != GNILND_PEER_DOWN) {
641 CNETERR("closing conn to %s: error %d\n",
642 libcfs_nid2str(peer->gnp_nid), error);
644 CDEBUG(D_NET, "closing conn to %s: error %d\n",
645 libcfs_nid2str(peer->gnp_nid), error);
648 LASSERTF(conn->gnc_state == GNILND_CONN_ESTABLISHED,
649 "conn %p to %s with bogus state %s\n", conn,
650 libcfs_nid2str(conn->gnc_peer->gnp_nid),
651 kgnilnd_conn_state2str(conn));
652 LASSERT(!list_empty(&conn->gnc_hashlist));
653 LASSERT(!list_empty(&conn->gnc_list));
656 /* mark peer count here so any place the EP gets destroyed will
657 * open up the peer count so that a new ESTABLISHED conn is then free
658 * to send new messages -- sending before the previous EPs are destroyed
659 * could end up with messages on the network for the old conn _after_
660 * the new conn and break the mbox safety protocol */
661 kgnilnd_admin_addref(conn->gnc_peer->gnp_dirty_eps);
663 /* Remove from conn hash table: no new callbacks */
664 list_del_init(&conn->gnc_hashlist);
665 kgnilnd_data.kgn_conn_version++;
666 kgnilnd_conn_decref(conn);
668 /* if we are in reset, go right to CLOSED as there is no scheduler
669 * thread to move from CLOSING to CLOSED */
670 if (unlikely(kgnilnd_data.kgn_in_reset)) {
671 conn->gnc_state = GNILND_CONN_CLOSED;
673 conn->gnc_state = GNILND_CONN_CLOSING;
676 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RDMA_CQ_ERROR)) {
677 msleep_interruptible(MSEC_PER_SEC);
680 /* leave on peer->gnp_conns to make sure we don't let the reaper
681 * or others try to unlink this peer until the conn is fully
682 * processed for closing */
684 if (kgnilnd_check_purgatory_conn(conn)) {
685 kgnilnd_add_purgatory_locked(conn, conn->gnc_peer);
688 /* Reset RX timeout to ensure we wait for an incoming CLOSE
689 * for the full timeout. If we get a CLOSE we know the
690 * peer has stopped all RDMA. Otherwise if we wait for
691 * the full timeout we can also be sure all RDMA has stopped. */
692 conn->gnc_last_rx = conn->gnc_last_rx_cq = jiffies;
695 /* schedule sending CLOSE - if we are in quiesce, this adds to
696 * gnd_ready_conns and allows us to find it in quiesce processing */
697 kgnilnd_schedule_conn(conn);
703 kgnilnd_close_conn(kgn_conn_t *conn, int error)
705 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
706 /* need to check the state here - this call is racy and we don't
707 * know the state until after the lock is grabbed */
708 if (conn->gnc_state == GNILND_CONN_ESTABLISHED) {
709 kgnilnd_close_conn_locked(conn, error);
711 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
715 kgnilnd_complete_closed_conn(kgn_conn_t *conn)
725 /* Dump log on cksum error - wait until complete phase to let
726 * RX of error happen */
727 if (*kgnilnd_tunables.kgn_checksum_dump &&
728 (conn != NULL && conn->gnc_peer_error == -ENOKEY)) {
729 libcfs_debug_dumplog();
732 /* _CLOSED set in kgnilnd_process_fmaq once we decide to
733 * send the CLOSE or not */
734 LASSERTF(conn->gnc_state == GNILND_CONN_CLOSED,
735 "conn 0x%p->%s with bad state %s\n",
736 conn, conn->gnc_peer ?
737 libcfs_nid2str(conn->gnc_peer->gnp_nid) :
739 kgnilnd_conn_state2str(conn));
741 LASSERT(list_empty(&conn->gnc_hashlist));
742 /* We shouldnt be on the delay list, the conn can
743 * get added to this list during a retransmit, and retransmits
744 * only occur within scheduler threads.
746 LASSERT(list_empty(&conn->gnc_delaylist));
748 /* we've sent the close, start nuking */
749 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SCHEDULE_COMPLETE))
750 kgnilnd_schedule_conn(conn);
752 if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
753 CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
754 "done, Attempting to recover conn 0x%p "
755 "scheduled %d function: %s line: %d\n", conn,
756 conn->gnc_scheduled, conn->gnc_sched_caller,
757 conn->gnc_sched_line);
761 /* we don't use lists to track things that we can get out of the
764 /* need to hold locks for tx_list_state, sampling it is too racy:
765 * - the lock actually protects tx != NULL, but we can't take the proper
766 * lock until we check tx_list_state, which would be too late and
767 * we could have the TX change under us.
768 * gnd_rdmaq_lock and gnd_lock and not used together, so taking both
770 spin_lock(&conn->gnc_device->gnd_rdmaq_lock);
771 spin_lock(&conn->gnc_device->gnd_lock);
773 for (nrdma = 0; nrdma < GNILND_MAX_MSG_ID; nrdma++) {
774 tx = conn->gnc_tx_ref_table[nrdma];
777 /* only print the first error and if not CLOSE, we often don't see
778 * CQ events for that by the time we get here... and really don't care */
779 if (nlive || tx->tx_msg.gnm_type == GNILND_MSG_CLOSE)
780 tx->tx_state |= GNILND_TX_QUIET_ERROR;
782 GNIDBG_TX(D_NET, tx, "cleaning up on close, nlive %d", nlive);
784 /* don't worry about gnc_lock here as nobody else should be
785 * touching this conn */
786 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
787 list_add_tail(&tx->tx_list, &sinners);
790 spin_unlock(&conn->gnc_device->gnd_lock);
791 spin_unlock(&conn->gnc_device->gnd_rdmaq_lock);
793 /* nobody should have marked this as needing scheduling after
794 * we called close - so only ref should be us handling it */
795 if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
796 CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
797 "done, Attempting to recover conn 0x%p "
798 "scheduled %d function %s line: %d\n", conn,
799 conn->gnc_scheduled, conn->gnc_sched_caller,
800 conn->gnc_sched_line);
802 /* now reset a few to actual counters... */
803 nrdma = atomic_read(&conn->gnc_nlive_rdma);
804 nq_rdma = atomic_read(&conn->gnc_nq_rdma);
806 if (!list_empty(&sinners)) {
807 list_for_each_entry_safe(tx, txn, &sinners, tx_list) {
808 /* clear tx_list to make tx_add_list_locked happy */
809 list_del_init(&tx->tx_list);
810 /* The error codes determine if we hold onto the MDD */
811 kgnilnd_tx_done(tx, conn->gnc_error);
815 logmsg = (nlive + nrdma + nq_rdma);
818 int level = conn->gnc_peer->gnp_state == GNILND_PEER_UP ?
820 CDEBUG(level, "Closed conn 0x%p->%s (errno %d,"
821 " peer errno %d): canceled %d TX, %d/%d RDMA\n",
822 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
823 conn->gnc_error, conn->gnc_peer_error,
824 nlive, nq_rdma, nrdma);
827 kgnilnd_destroy_conn_ep(conn);
829 /* Bug 765042 - race this with completing a new conn to same peer - we need
830 * finish_connect to detach purgatory before we can do it ourselves here */
831 CFS_RACE(CFS_FAIL_GNI_FINISH_PURG);
833 /* now it is safe to remove from peer list - anyone looking at
834 * gnp_conns now is free to unlink if not on purgatory */
835 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
837 conn->gnc_state = GNILND_CONN_DONE;
839 /* Decrement counter if we are marked by del_conn_or_peers for closing
841 if (conn->gnc_needs_closing)
842 kgnilnd_admin_decref(kgnilnd_data.kgn_npending_conns);
844 /* Remove from peer's list of valid connections if its not in purgatory */
845 if (!conn->gnc_in_purgatory) {
846 list_del_init(&conn->gnc_list);
847 /* Lose peers reference on the conn */
848 kgnilnd_conn_decref(conn);
851 /* NB - only unlinking if we set pending in del_peer_locked from admin or
853 if (kgnilnd_peer_active(conn->gnc_peer) &&
854 conn->gnc_peer->gnp_pending_unlink &&
855 kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
856 kgnilnd_unlink_peer_locked(conn->gnc_peer);
859 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
861 /* I'm telling Mommy! - use peer_error if they initiated close */
862 kgnilnd_peer_notify(conn->gnc_peer,
863 conn->gnc_error == -ECONNRESET ?
864 conn->gnc_peer_error : conn->gnc_error, 0);
870 kgnilnd_set_conn_params(kgn_dgram_t *dgram)
872 kgn_conn_t *conn = dgram->gndg_conn;
873 kgn_connreq_t *connreq = &dgram->gndg_conn_in;
874 kgn_gniparams_t *rem_param = &connreq->gncr_gnparams;
877 gni_smsg_attr_t *remote = &connreq->gncr_gnparams.gnpr_smsg_attr;
879 /* set timeout vals in conn early so we can use them for the NAK */
881 /* use max of the requested and our timeout, peer will do the same */
882 conn->gnc_timeout = max(conn->gnc_timeout, connreq->gncr_timeout);
884 /* only ep_bind really mucks around with the CQ */
885 /* only ep bind if we are not connecting to ourself and the dstnid is not a wildcard. this check
886 * is necessary as you can only bind an ep once and we must make sure we dont bind when already bound.
888 if (connreq->gncr_dstnid != LNET_NID_ANY && dgram->gndg_conn_out.gncr_dstnid != connreq->gncr_srcnid) {
889 mutex_lock(&conn->gnc_device->gnd_cq_mutex);
890 rrc = kgnilnd_ep_bind(conn->gnc_ephandle,
891 connreq->gncr_gnparams.gnpr_host_id,
893 mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
894 if (rrc != GNI_RC_SUCCESS) {
900 rrc = kgnilnd_ep_set_eventdata(conn->gnc_ephandle, conn->gnc_cqid,
901 connreq->gncr_gnparams.gnpr_cqid);
902 if (rrc != GNI_RC_SUCCESS) {
907 /* Initialize SMSG */
908 rrc = kgnilnd_smsg_init(conn->gnc_ephandle, &conn->gnpr_smsg_attr,
909 &connreq->gncr_gnparams.gnpr_smsg_attr);
910 if (unlikely(rrc == GNI_RC_INVALID_PARAM)) {
911 gni_smsg_attr_t *local = &conn->gnpr_smsg_attr;
912 /* help folks figure out if there is a tunable off, etc. */
913 LCONSOLE_ERROR("SMSG attribute mismatch. Data from local/remote:"
914 " type %d/%d msg_maxsize %u/%u"
915 " mbox_maxcredit %u/%u. Please check kgni"
916 " logs for further data\n",
917 local->msg_type, remote->msg_type,
918 local->msg_maxsize, remote->msg_maxsize,
919 local->mbox_maxcredit, remote->mbox_maxcredit);
921 if (rrc != GNI_RC_SUCCESS) {
926 /* log this for help in debuggin SMSG buffer re-use */
927 CDEBUG(D_NET, "conn %p src %s dst %s smsg %p acquired"
928 " local cqid %u SMSG %p->%u hndl %#llx.%#llx"
929 " remote cqid %u SMSG %p->%u hndl %#llx.%#llx\n",
930 conn, libcfs_nid2str(connreq->gncr_srcnid),
931 libcfs_nid2str(connreq->gncr_dstnid),
932 &conn->gnpr_smsg_attr,
934 conn->gnpr_smsg_attr.msg_buffer,
935 conn->gnpr_smsg_attr.mbox_offset,
936 conn->gnpr_smsg_attr.mem_hndl.qword1,
937 conn->gnpr_smsg_attr.mem_hndl.qword2,
938 rem_param->gnpr_cqid,
939 rem_param->gnpr_smsg_attr.msg_buffer,
940 rem_param->gnpr_smsg_attr.mbox_offset,
941 rem_param->gnpr_smsg_attr.mem_hndl.qword1,
942 rem_param->gnpr_smsg_attr.mem_hndl.qword2);
944 conn->gnc_peerstamp = connreq->gncr_peerstamp;
945 conn->gnc_peer_connstamp = connreq->gncr_connstamp;
946 conn->remote_mbox_addr = (void *)((char *)remote->msg_buffer + remote->mbox_offset);
948 /* We update the reaper timeout once we have a valid conn and timeout */
949 kgnilnd_update_reaper_timeout(GNILND_TO2KA(conn->gnc_timeout));
954 rrc = kgnilnd_ep_unbind(conn->gnc_ephandle);
955 /* not sure I can just let this fly */
956 LASSERTF(rrc == GNI_RC_SUCCESS,
957 "bad rc from gni_ep_unbind trying to cleanup: %d\n", rrc);
960 LASSERTF(rc != 0, "SOFTWARE BUG: rc == 0\n");
961 CERROR("Error setting connection params from %s: %d\n",
962 libcfs_nid2str(connreq->gncr_srcnid), rc);
966 /* needs down_read on kgn_net_rw_sem held from before this call until
967 * after the write_lock on kgn_peer_conn_lock - this ensures we stay sane
968 * with kgnilnd_shutdown - it'll get the sem and set shutdown, then get the
969 * kgn_peer_conn_lock to start del_peer'ing. If we hold the sem until after
970 * kgn_peer_conn_lock is held, we guarantee that nobody calls
971 * kgnilnd_add_peer_locked without checking gnn_shutdown */
973 kgnilnd_create_peer_safe(kgn_peer_t **peerp,
981 LASSERT(nid != LNET_NID_ANY);
983 /* We dont pass the net around in the dgram anymore so here is where we find it
984 * this will work unless its in shutdown or the nid has a net that is invalid.
985 * Either way error code needs to be returned in that case.
987 * If the net passed in is not NULL then we can use it, this alleviates looking it
988 * when the calling function has access to the data.
991 rc = kgnilnd_find_net(nid, &net);
995 /* find net adds a reference on the net if we are not using
996 * it we must do it manually so the net references are
997 * correct when tearing down the net
999 kgnilnd_net_addref(net);
1002 LIBCFS_ALLOC(peer, sizeof(*peer));
1004 kgnilnd_net_decref(net);
1007 peer->gnp_nid = nid;
1008 peer->gnp_state = node_state;
1010 /* translate from nid to nic addr & store */
1011 rc = kgnilnd_nid_to_nicaddrs(LNET_NIDADDR(nid), 1, &peer->gnp_host_id);
1013 kgnilnd_net_decref(net);
1014 LIBCFS_FREE(peer, sizeof(*peer));
1017 CDEBUG(D_NET, "peer 0x%p->%s -> NIC 0x%x\n", peer,
1018 libcfs_nid2str(nid), peer->gnp_host_id);
1020 atomic_set(&peer->gnp_refcount, 1); /* 1 ref for caller */
1021 atomic_set(&peer->gnp_dirty_eps, 0);
1023 INIT_LIST_HEAD(&peer->gnp_list);
1024 INIT_LIST_HEAD(&peer->gnp_connd_list);
1025 INIT_LIST_HEAD(&peer->gnp_conns);
1026 INIT_LIST_HEAD(&peer->gnp_tx_queue);
1028 /* the first reconnect should happen immediately, so we leave
1029 * gnp_reconnect_interval set to 0 */
1031 LASSERTF(net != NULL, "peer 0x%p->%s with NULL net\n",
1032 peer, libcfs_nid2str(nid));
1034 /* must have kgn_net_rw_sem held for this... */
1035 if (net->gnn_shutdown) {
1036 /* shutdown has started already */
1037 kgnilnd_net_decref(net);
1038 LIBCFS_FREE(peer, sizeof(*peer));
1042 peer->gnp_net = net;
1044 atomic_inc(&kgnilnd_data.kgn_npeers);
1051 kgnilnd_destroy_peer(kgn_peer_t *peer)
1053 CDEBUG(D_NET, "peer %s %p deleted\n",
1054 libcfs_nid2str(peer->gnp_nid), peer);
1055 LASSERTF(atomic_read(&peer->gnp_refcount) == 0,
1056 "peer 0x%p->%s refs %d\n",
1057 peer, libcfs_nid2str(peer->gnp_nid),
1058 atomic_read(&peer->gnp_refcount));
1059 LASSERTF(atomic_read(&peer->gnp_dirty_eps) == 0,
1060 "peer 0x%p->%s dirty eps %d\n",
1061 peer, libcfs_nid2str(peer->gnp_nid),
1062 atomic_read(&peer->gnp_dirty_eps));
1063 LASSERTF(peer->gnp_net != NULL, "peer %p (%s) with NULL net\n",
1064 peer, libcfs_nid2str(peer->gnp_nid));
1065 LASSERTF(!kgnilnd_peer_active(peer),
1067 peer, libcfs_nid2str(peer->gnp_nid));
1068 LASSERTF(peer->gnp_connecting == GNILND_PEER_IDLE || peer->gnp_connecting == GNILND_PEER_KILL,
1069 "peer 0x%p->%s, connecting %d\n",
1070 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
1071 LASSERTF(list_empty(&peer->gnp_conns),
1073 peer, libcfs_nid2str(peer->gnp_nid));
1074 LASSERTF(list_empty(&peer->gnp_tx_queue),
1076 peer, libcfs_nid2str(peer->gnp_nid));
1077 LASSERTF(list_empty(&peer->gnp_connd_list),
1079 peer, libcfs_nid2str(peer->gnp_nid));
1081 /* NB a peer's connections keep a reference on their peer until
1082 * they are destroyed, so we can be assured that _all_ state to do
1083 * with this peer has been cleaned up when its refcount drops to
1086 atomic_dec(&kgnilnd_data.kgn_npeers);
1087 kgnilnd_net_decref(peer->gnp_net);
1089 LIBCFS_FREE(peer, sizeof(*peer));
1092 /* the conn might not have made it all the way through to a connected
1093 * state - but we need to purgatory any conn that a remote peer might
1094 * have seen through a posted dgram as well */
1096 kgnilnd_add_purgatory_locked(kgn_conn_t *conn, kgn_peer_t *peer)
1098 kgn_mbox_info_t *mbox = NULL;
1101 /* NB - the caller should own conn by removing him from the
1102 * scheduler thread when finishing the close */
1104 LASSERTF(peer != NULL, "conn %p with NULL peer\n", conn);
1106 /* If this is still true, need to add the calls to unlink back in and
1107 * figure out how to close the hole on loopback conns */
1108 LASSERTF(kgnilnd_peer_active(peer), "can't use inactive peer %s (%p)"
1109 " we'll never recover the resources\n",
1110 libcfs_nid2str(peer->gnp_nid), peer);
1112 CDEBUG(D_NET, "conn %p peer %p dev %p\n", conn, peer,
1115 LASSERTF(conn->gnc_in_purgatory == 0,
1116 "Conn already in purgatory\n");
1117 conn->gnc_in_purgatory = 1;
1119 mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1120 mbox->mbx_prev_purg_nid = peer->gnp_nid;
1121 mbox->mbx_add_purgatory = jiffies;
1122 kgnilnd_release_mbox(conn, 1);
1124 LASSERTF(list_empty(&conn->gnc_mdd_list),
1125 "conn 0x%p->%s with active purgatory hold MDD %d\n",
1126 conn, libcfs_nid2str(peer->gnp_nid),
1127 kgnilnd_count_list(&conn->gnc_mdd_list));
1132 /* Instead of detaching everything from purgatory here we just mark the conn as needing
1133 * detach, when the reaper checks the conn the next time it will detach it.
1134 * Calling function requires write_lock held on kgn_peer_conn_lock
1137 kgnilnd_mark_for_detach_purgatory_all_locked(kgn_peer_t *peer) {
1140 list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
1141 if (conn->gnc_in_purgatory && !conn->gnc_needs_detach) {
1142 conn->gnc_needs_detach = 1;
1143 kgnilnd_admin_addref(kgnilnd_data.kgn_npending_detach);
1148 /* Calling function needs a write_lock held on kgn_peer_conn_lock */
1150 kgnilnd_detach_purgatory_locked(kgn_conn_t *conn, struct list_head *conn_list)
1152 kgn_mbox_info_t *mbox = NULL;
1154 /* if needed, add the conn purgatory data to the list passed in */
1155 if (conn->gnc_in_purgatory) {
1156 CDEBUG(D_NET, "peer %p->%s purg_conn %p@%s mdd_list #tx %d\n",
1157 conn->gnc_peer, libcfs_nid2str(conn->gnc_peer->gnp_nid),
1158 conn, kgnilnd_conn_state2str(conn),
1159 kgnilnd_count_list(&conn->gnc_mdd_list));
1161 mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1162 mbox->mbx_detach_of_purgatory = jiffies;
1164 /* conn->gnc_list is the entry point on peer->gnp_conns, so detaching it
1165 * here removes it from the list of 'valid' peer connections.
1166 * We put the current conn onto a list of conns to call kgnilnd_release_purgatory_locked()
1167 * and as such the caller of kgnilnd_detach_purgatory_locked() now owns that conn, since its not
1168 * on the peer's conn_list anymore.
1171 list_del_init(&conn->gnc_list);
1173 /* NB - only unlinking if we set pending in del_peer_locked from admin or
1175 if (kgnilnd_peer_active(conn->gnc_peer) &&
1176 conn->gnc_peer->gnp_pending_unlink &&
1177 kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
1178 kgnilnd_unlink_peer_locked(conn->gnc_peer);
1180 /* The reaper will not call detach unless the conn is fully through kgnilnd_complete_closed_conn.
1181 * If the conn is not in a DONE state somehow we are attempting to detach even though
1182 * the conn has not been fully cleaned up. If we detach while the conn is still closing
1183 * we will end up with an orphaned connection that has valid ep_handle, that is not on a
1187 LASSERTF(conn->gnc_state == GNILND_CONN_DONE, "Conn in invalid state %p@%s \n",
1188 conn, kgnilnd_conn_state2str(conn));
1190 /* move from peer to the delayed release list */
1191 list_add_tail(&conn->gnc_list, conn_list);
1196 kgnilnd_release_purgatory_list(struct list_head *conn_list)
1199 kgn_conn_t *conn, *connN;
1200 kgn_mdd_purgatory_t *gmp, *gmpN;
1202 list_for_each_entry_safe(conn, connN, conn_list, gnc_list) {
1203 dev = conn->gnc_device;
1205 kgnilnd_release_mbox(conn, -1);
1206 conn->gnc_in_purgatory = 0;
1208 list_del_init(&conn->gnc_list);
1210 /* gnc_needs_detach is set in kgnilnd_del_conn_or_peer. It is used to keep track
1211 * of conns that have been marked for detach by kgnilnd_del_conn_or_peer.
1212 * The function uses kgn_npending_detach to verify the conn has
1213 * actually been detached.
1216 if (conn->gnc_needs_detach)
1217 kgnilnd_admin_decref(kgnilnd_data.kgn_npending_detach);
1219 /* if this guy is really dead (we are doing release from reaper),
1220 * make sure we tell LNet - if this is from other context,
1221 * the checks in the function will prevent an errant
1223 kgnilnd_peer_notify(conn->gnc_peer, conn->gnc_error, 0);
1225 list_for_each_entry_safe(gmp, gmpN, &conn->gnc_mdd_list,
1228 "dev %p releasing held mdd %#llx.%#llx\n",
1229 conn->gnc_device, gmp->gmp_map_key.qword1,
1230 gmp->gmp_map_key.qword2);
1232 atomic_dec(&dev->gnd_n_mdd_held);
1233 kgnilnd_mem_mdd_release(conn->gnc_device->gnd_handle,
1235 /* ignoring the return code - if kgni/ghal can't find it
1236 * it must be released already */
1238 list_del_init(&gmp->gmp_list);
1239 LIBCFS_FREE(gmp, sizeof(*gmp));
1241 /* lose conn ref for purgatory */
1242 kgnilnd_conn_decref(conn);
1246 /* needs write_lock on kgnilnd_data.kgn_peer_conn_lock held */
1248 kgnilnd_peer_increase_reconnect_locked(kgn_peer_t *peer)
1252 current_to = peer->gnp_reconnect_interval;
1254 /* we'll try to reconnect fast the first time, then back-off */
1255 if (current_to == 0) {
1256 peer->gnp_reconnect_time = jiffies - 1;
1257 current_to = *kgnilnd_tunables.kgn_min_reconnect_interval;
1259 peer->gnp_reconnect_time = jiffies + cfs_time_seconds(current_to);
1260 /* add 50% of min timeout & retry */
1261 current_to += *kgnilnd_tunables.kgn_min_reconnect_interval / 2;
1264 current_to = min(current_to,
1265 *kgnilnd_tunables.kgn_max_reconnect_interval);
1267 peer->gnp_reconnect_interval = current_to;
1268 CDEBUG(D_NET, "peer %s can reconnect at %lu interval %lu\n",
1269 libcfs_nid2str(peer->gnp_nid), peer->gnp_reconnect_time,
1270 peer->gnp_reconnect_interval);
1273 /* needs kgnilnd_data.kgn_peer_conn_lock held */
1275 kgnilnd_find_peer_locked(lnet_nid_t nid)
1277 struct list_head *peer_list = kgnilnd_nid2peerlist(nid);
1280 /* Chopping nid down to only NIDADDR using LNET_NIDADDR so we only
1281 * have a single peer per device instead of a peer per nid/net combo.
1284 list_for_each_entry(peer, peer_list, gnp_list) {
1285 if (LNET_NIDADDR(nid) != LNET_NIDADDR(peer->gnp_nid))
1288 CDEBUG(D_NET, "got peer [%p] -> %s c %d (%d)\n",
1289 peer, libcfs_nid2str(nid),
1290 peer->gnp_connecting,
1291 atomic_read(&peer->gnp_refcount));
1297 /* need write_lock on kgn_peer_conn_lock */
1299 kgnilnd_unlink_peer_locked(kgn_peer_t *peer)
1301 LASSERTF(list_empty(&peer->gnp_conns),
1303 peer, libcfs_nid2str(peer->gnp_nid));
1304 LASSERTF(list_empty(&peer->gnp_tx_queue),
1306 peer, libcfs_nid2str(peer->gnp_nid));
1307 LASSERTF(kgnilnd_peer_active(peer),
1309 peer, libcfs_nid2str(peer->gnp_nid));
1310 CDEBUG(D_NET, "unlinking peer 0x%p->%s\n",
1311 peer, libcfs_nid2str(peer->gnp_nid));
1313 list_del_init(&peer->gnp_list);
1314 kgnilnd_data.kgn_peer_version++;
1315 kgnilnd_admin_decref(kgnilnd_data.kgn_npending_unlink);
1316 /* lose peerlist's ref */
1317 kgnilnd_peer_decref(peer);
1321 kgnilnd_get_peer_info(int index,
1322 kgn_peer_t **found_peer,
1323 lnet_nid_t *id, __u32 *nic_addr,
1324 int *refcount, int *connecting)
1326 struct list_head *ptmp;
1331 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1333 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1335 list_for_each(ptmp, &kgnilnd_data.kgn_peers[i]) {
1336 peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1341 CDEBUG(D_NET, "found peer %p (%s) at index %d\n",
1342 peer, libcfs_nid2str(peer->gnp_nid), index);
1345 *id = peer->gnp_nid;
1346 *nic_addr = peer->gnp_host_id;
1347 *refcount = atomic_read(&peer->gnp_refcount);
1348 *connecting = peer->gnp_connecting;
1355 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1357 CDEBUG(D_NET, "no gni peer at index %d\n", index);
1361 /* requires write_lock on kgn_peer_conn_lock held */
1363 kgnilnd_add_peer_locked(lnet_nid_t nid, kgn_peer_t *new_stub_peer, kgn_peer_t **peerp)
1365 kgn_peer_t *peer, *peer2;
1367 LASSERTF(new_stub_peer != NULL, "bad stub peer for nid %s\n",
1368 libcfs_nid2str(nid));
1370 peer2 = kgnilnd_find_peer_locked(nid);
1371 if (peer2 != NULL) {
1372 /* A peer was created during the lock transition, so drop
1373 * the new one we created */
1374 kgnilnd_peer_decref(new_stub_peer);
1377 peer = new_stub_peer;
1378 /* peer table takes existing ref on peer */
1380 LASSERTF(!kgnilnd_peer_active(peer),
1381 "peer 0x%p->%s already in peer table\n",
1382 peer, libcfs_nid2str(peer->gnp_nid));
1383 list_add_tail(&peer->gnp_list,
1384 kgnilnd_nid2peerlist(nid));
1385 kgnilnd_data.kgn_peer_version++;
1388 LASSERTF(peer->gnp_net != NULL, "peer 0x%p->%s with NULL net\n",
1389 peer, libcfs_nid2str(peer->gnp_nid));
1394 kgnilnd_add_peer(kgn_net_t *net, lnet_nid_t nid, kgn_peer_t **peerp)
1401 if (nid == LNET_NID_ANY)
1404 node_state = kgnilnd_get_node_state(LNET_NIDADDR(nid));
1406 /* NB - this will not block during normal operations -
1407 * the only writer of this is in the startup/shutdown path. */
1408 rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
1413 rc = kgnilnd_create_peer_safe(&peer, nid, net, node_state);
1415 up_read(&kgnilnd_data.kgn_net_rw_sem);
1419 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1420 up_read(&kgnilnd_data.kgn_net_rw_sem);
1422 kgnilnd_add_peer_locked(nid, peer, peerp);
1424 CDEBUG(D_NET, "peer 0x%p->%s connecting %d\n",
1425 peerp, libcfs_nid2str((*peerp)->gnp_nid),
1426 (*peerp)->gnp_connecting);
1428 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1432 /* needs write_lock on kgn_peer_conn_lock */
1434 kgnilnd_cancel_peer_connect_locked(kgn_peer_t *peer, struct list_head *zombies)
1438 /* we do care about state of gnp_connecting - we could be between
1439 * reconnect attempts, so try to find the dgram and cancel the TX
1440 * anyways. If we are in the process of posting DONT do anything;
1441 * once it fails or succeeds we can nuke the connect attempt.
1442 * We have no idea where in kgnilnd_post_dgram we are so we cant
1443 * attempt to cancel until the function is done.
1446 /* make sure peer isn't in process of connecting or waiting for connect*/
1447 spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1448 if (!(list_empty(&peer->gnp_connd_list))) {
1449 list_del_init(&peer->gnp_connd_list);
1450 /* remove connd ref */
1451 kgnilnd_peer_decref(peer);
1453 spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1455 if (peer->gnp_connecting == GNILND_PEER_POSTING || peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
1456 peer->gnp_connecting = GNILND_PEER_NEEDS_DEATH;
1457 /* We are in process of posting right now the xchg set it up for us to
1458 * cancel the connect so we are finished for now */
1460 /* no need for exchange we have the peer lock and its ready for us to nuke */
1461 LASSERTF(peer->gnp_connecting != GNILND_PEER_POSTING,
1462 "Peer in invalid state 0x%p->%s, connecting %d\n",
1463 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
1464 peer->gnp_connecting = GNILND_PEER_IDLE;
1465 set_mb(peer->gnp_last_dgram_errno, -ETIMEDOUT);
1466 kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev,
1470 /* The least we can do is nuke the tx's no matter what.... */
1471 list_for_each_entry_safe(tx, txn, &peer->gnp_tx_queue, tx_list) {
1472 kgnilnd_tx_del_state_locked(tx, peer, NULL,
1474 list_add_tail(&tx->tx_list, zombies);
1478 /* needs write_lock on kgn_peer_conn_lock */
1480 kgnilnd_del_peer_locked(kgn_peer_t *peer, int error)
1482 /* this peer could be passive and only held for purgatory,
1483 * take a ref to ensure it doesn't disappear in this function */
1484 kgnilnd_peer_addref(peer);
1486 CFS_RACE(CFS_FAIL_GNI_FIND_TARGET);
1488 /* if purgatory release cleared it out, don't try again */
1489 if (kgnilnd_peer_active(peer)) {
1490 /* always do this to allow kgnilnd_start_connect and
1491 * kgnilnd_finish_connect to catch this before they
1492 * wrap up their operations */
1493 if (kgnilnd_can_unlink_peer_locked(peer)) {
1494 /* already released purgatory, so only active
1496 kgnilnd_unlink_peer_locked(peer);
1498 kgnilnd_close_peer_conns_locked(peer, error);
1499 /* peer unlinks itself when last conn is closed */
1503 /* we are done, release back to the wild */
1504 kgnilnd_peer_decref(peer);
1508 kgnilnd_del_conn_or_peer(kgn_net_t *net, lnet_nid_t nid, int command,
1512 LIST_HEAD (zombies);
1513 struct list_head *ptmp, *pnxt;
1520 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1522 if (nid != LNET_NID_ANY)
1523 lo = hi = kgnilnd_nid2peerlist(nid) - kgnilnd_data.kgn_peers;
1526 hi = *kgnilnd_tunables.kgn_peer_hash_size - 1;
1527 /* wildcards always succeed */
1531 for (i = lo; i <= hi; i++) {
1532 list_for_each_safe(ptmp, pnxt, &kgnilnd_data.kgn_peers[i]) {
1533 peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1535 LASSERTF(peer->gnp_net != NULL,
1536 "peer %p (%s) with NULL net\n",
1537 peer, libcfs_nid2str(peer->gnp_nid));
1539 if (net != NULL && peer->gnp_net != net)
1542 if (!(nid == LNET_NID_ANY || LNET_NIDADDR(peer->gnp_nid) == LNET_NIDADDR(nid)))
1545 /* In both cases, we want to stop any in-flight
1546 * connect attempts */
1547 kgnilnd_cancel_peer_connect_locked(peer, &zombies);
1550 case GNILND_DEL_CONN:
1551 kgnilnd_close_peer_conns_locked(peer, error);
1553 case GNILND_DEL_PEER:
1554 peer->gnp_pending_unlink = 1;
1555 kgnilnd_admin_addref(kgnilnd_data.kgn_npending_unlink);
1556 kgnilnd_mark_for_detach_purgatory_all_locked(peer);
1557 kgnilnd_del_peer_locked(peer, error);
1559 case GNILND_CLEAR_PURGATORY:
1560 /* Mark everything ready for detach reaper will cleanup
1561 * once we release the kgn_peer_conn_lock
1563 kgnilnd_mark_for_detach_purgatory_all_locked(peer);
1564 peer->gnp_last_errno = -EISCONN;
1565 /* clear reconnect so he can reconnect soon */
1566 peer->gnp_reconnect_time = 0;
1567 peer->gnp_reconnect_interval = 0;
1570 CERROR("bad command %d\n", command);
1573 /* we matched something */
1578 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1581 kgnilnd_txlist_done(&zombies, error);
1583 /* This function does not return until the commands it initiated have completed,
1584 * since they have to work there way through the other threads. In the case of shutdown
1585 * threads are not woken up until after this call is initiated so we cannot wait, we just
1586 * need to return. The same applies for stack reset we shouldnt wait as the reset thread
1590 CFS_RACE(CFS_FAIL_GNI_RACE_RESET);
1592 if (error == -ENOTRECOVERABLE || error == -ESHUTDOWN) {
1597 while (atomic_read(&kgnilnd_data.kgn_npending_conns) ||
1598 atomic_read(&kgnilnd_data.kgn_npending_detach) ||
1599 atomic_read(&kgnilnd_data.kgn_npending_unlink)) {
1601 schedule_timeout_uninterruptible(cfs_time_seconds(1));
1604 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, "Waiting on %d peers %d closes %d detaches\n",
1605 atomic_read(&kgnilnd_data.kgn_npending_unlink),
1606 atomic_read(&kgnilnd_data.kgn_npending_conns),
1607 atomic_read(&kgnilnd_data.kgn_npending_detach));
1614 kgnilnd_get_conn_by_idx(int index)
1617 struct list_head *ptmp;
1619 struct list_head *ctmp;
1623 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1624 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1625 list_for_each(ptmp, &kgnilnd_data.kgn_peers[i]) {
1627 peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1629 list_for_each(ctmp, &peer->gnp_conns) {
1630 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
1632 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
1638 CDEBUG(D_NET, "++conn[%p] -> %s (%d)\n", conn,
1639 libcfs_nid2str(conn->gnc_peer->gnp_nid),
1640 atomic_read(&conn->gnc_refcount));
1641 kgnilnd_conn_addref(conn);
1642 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1646 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1653 kgnilnd_get_conn_info(kgn_peer_t *peer,
1654 int *device_id, __u64 *peerstamp,
1655 int *tx_seq, int *rx_seq,
1656 int *fmaq_len, int *nfma, int *nrdma)
1661 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1663 conn = kgnilnd_find_conn_locked(peer);
1669 *device_id = conn->gnc_device->gnd_host_id;
1670 *peerstamp = conn->gnc_peerstamp;
1671 *tx_seq = atomic_read(&conn->gnc_tx_seq);
1672 *rx_seq = atomic_read(&conn->gnc_rx_seq);
1673 *fmaq_len = kgnilnd_count_list(&conn->gnc_fmaq);
1674 *nfma = atomic_read(&conn->gnc_nlive_fma);
1675 *nrdma = atomic_read(&conn->gnc_nlive_rdma);
1677 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1681 /* needs write_lock on kgn_peer_conn_lock */
1683 kgnilnd_close_peer_conns_locked(kgn_peer_t *peer, int why)
1686 struct list_head *ctmp, *cnxt;
1689 list_for_each_safe(ctmp, cnxt, &peer->gnp_conns) {
1690 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
1692 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
1696 /* we mark gnc_needs closing and increment kgn_npending_conns so that
1697 * kgnilnd_del_conn_or_peer can wait on the other threads closing
1698 * and cleaning up the connection.
1700 if (!conn->gnc_needs_closing) {
1701 conn->gnc_needs_closing = 1;
1702 kgnilnd_admin_addref(kgnilnd_data.kgn_npending_conns);
1704 kgnilnd_close_conn_locked(conn, why);
1710 kgnilnd_report_node_state(lnet_nid_t nid, int down)
1713 kgn_peer_t *peer, *new_peer;
1716 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1717 peer = kgnilnd_find_peer_locked(nid);
1724 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1726 /* Don't add a peer for node up events */
1727 if (down == GNILND_PEER_UP)
1730 /* find any valid net - we don't care which one... */
1731 down_read(&kgnilnd_data.kgn_net_rw_sem);
1732 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
1733 list_for_each_entry(net, &kgnilnd_data.kgn_nets[i],
1743 up_read(&kgnilnd_data.kgn_net_rw_sem);
1746 CNETERR("Could not find a net for nid %lld\n", nid);
1750 /* The nid passed in does not yet contain the net portion.
1751 * Let's build it up now
1753 nid = LNET_MKNID(LNET_NIDNET(net->gnn_ni->ni_nid), nid);
1754 rc = kgnilnd_add_peer(net, nid, &new_peer);
1757 CNETERR("Could not add peer for nid %lld, rc %d\n",
1762 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1763 peer = kgnilnd_find_peer_locked(nid);
1766 CNETERR("Could not find peer for nid %lld\n", nid);
1767 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1772 peer->gnp_state = down;
1774 if (down == GNILND_PEER_DOWN) {
1777 peer->gnp_down_event_time = jiffies;
1778 kgnilnd_cancel_peer_connect_locked(peer, &zombies);
1779 conn = kgnilnd_find_conn_locked(peer);
1782 kgnilnd_close_conn_locked(conn, -ENETRESET);
1785 peer->gnp_up_event_time = jiffies;
1788 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1790 if (down == GNILND_PEER_DOWN) {
1791 /* using ENETRESET so we don't get messages from
1794 kgnilnd_txlist_done(&zombies, -ENETRESET);
1795 kgnilnd_peer_notify(peer, -ECONNRESET, 0);
1796 LCONSOLE_INFO("Received down event for nid %d\n",
1804 kgnilnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
1806 struct libcfs_ioctl_data *data = arg;
1807 kgn_net_t *net = ni->ni_data;
1810 LASSERT(ni == net->gnn_ni);
1813 case IOC_LIBCFS_GET_PEER: {
1815 kgn_peer_t *peer = NULL;
1817 __u64 peerstamp = 0;
1818 int peer_refcount = 0, peer_connecting = 0;
1820 int tx_seq = 0, rx_seq = 0;
1821 int fmaq_len = 0, nfma = 0, nrdma = 0;
1823 rc = kgnilnd_get_peer_info(data->ioc_count, &peer,
1824 &nid, &nic_addr, &peer_refcount,
1830 /* LNET_MKNID is used to mask from lnet the multiplexing/demultiplexing of connections and peers
1831 * LNET assumes a conn and peer per net, the LNET_MKNID/LNET_NIDADDR allows us to let Lnet see what it
1832 * wants to see instead of the underlying network that is being used to send the data
1834 data->ioc_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), LNET_NIDADDR(nid));
1835 data->ioc_flags = peer_connecting;
1836 data->ioc_count = peer_refcount;
1838 rc = kgnilnd_get_conn_info(peer, &device_id, &peerstamp,
1839 &tx_seq, &rx_seq, &fmaq_len,
1842 /* This is allowable - a persistent peer could not
1843 * have a connection */
1845 /* flag to indicate we are not connected -
1846 * need to print as such */
1847 data->ioc_flags |= (1<<16);
1851 data->ioc_net = device_id;
1852 data->ioc_u64[0] = peerstamp;
1853 data->ioc_u32[0] = fmaq_len;
1854 data->ioc_u32[1] = nfma;
1855 data->ioc_u32[2] = tx_seq;
1856 data->ioc_u32[3] = rx_seq;
1857 data->ioc_u32[4] = nrdma;
1861 case IOC_LIBCFS_ADD_PEER: {
1862 /* just dummy value to allow using common interface */
1864 rc = kgnilnd_add_peer(net, data->ioc_nid, &peer);
1867 case IOC_LIBCFS_DEL_PEER: {
1868 /* NULL is passed in so it affects all peers in existence without regard to network
1869 * as the peer may not exist on the network LNET believes it to be on.
1871 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1872 GNILND_DEL_PEER, -EUCLEAN);
1875 case IOC_LIBCFS_GET_CONN: {
1876 kgn_conn_t *conn = kgnilnd_get_conn_by_idx(data->ioc_count);
1882 /* LNET_MKNID is used to build the correct address based on what LNET wants to see instead of
1883 * the generic connection that is used to send the data
1885 data->ioc_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), LNET_NIDADDR(conn->gnc_peer->gnp_nid));
1886 data->ioc_u32[0] = conn->gnc_device->gnd_id;
1887 kgnilnd_conn_decref(conn);
1891 case IOC_LIBCFS_CLOSE_CONNECTION: {
1892 /* use error = -ENETRESET to indicate it was lctl disconnect */
1893 /* NULL is passed in so it affects all the nets as the connection is virtual
1894 * and may not exist on the network LNET believes it to be on.
1896 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1897 GNILND_DEL_CONN, -ENETRESET);
1900 case IOC_LIBCFS_PUSH_CONNECTION: {
1901 /* we use this to flush purgatory */
1902 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1903 GNILND_CLEAR_PURGATORY, -EUCLEAN);
1906 case IOC_LIBCFS_REGISTER_MYNID: {
1907 /* Ignore if this is a noop */
1908 if (data->ioc_nid == ni->ni_nid) {
1911 CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
1912 libcfs_nid2str(data->ioc_nid),
1913 libcfs_nid2str(ni->ni_nid));
1924 kgnilnd_dev_init(kgn_device_t *dev)
1928 unsigned int cq_size;
1931 /* size of these CQs should be able to accommodate the outgoing
1932 * RDMA and SMSG transactions. Since we really don't know what we
1933 * really need here, we'll take credits * 2 * 3 to allow a bunch.
1934 * We need to dig into this more with the performance work. */
1935 cq_size = *kgnilnd_tunables.kgn_credits * 2 * 3;
1937 rrc = kgnilnd_cdm_create(dev->gnd_id, *kgnilnd_tunables.kgn_ptag,
1938 *kgnilnd_tunables.kgn_pkey, 0,
1940 if (rrc != GNI_RC_SUCCESS) {
1941 CERROR("Can't create CDM %d (%d)\n", dev->gnd_id, rrc);
1942 GOTO(failed, rc = -ENODEV);
1945 rrc = kgnilnd_cdm_attach(dev->gnd_domain, dev->gnd_id,
1946 &dev->gnd_host_id, &dev->gnd_handle);
1947 if (rrc != GNI_RC_SUCCESS) {
1948 CERROR("Can't attach CDM to device %d (%d)\n",
1950 GOTO(failed, rc = -ENODEV);
1953 /* a bit gross, but not much we can do - Aries Sim doesn't have
1954 * hardcoded NIC/NID that we can use */
1955 rc = kgnilnd_setup_nic_translation(dev->gnd_host_id);
1957 GOTO(failed, rc = -ENODEV);
1959 /* only dev 0 gets the errors - no need to reset the stack twice
1960 * - this works because we have a single PTAG, if we had more
1961 * then we'd need to have multiple handlers */
1962 if (dev->gnd_id == 0) {
1963 rrc = kgnilnd_subscribe_errors(dev->gnd_handle,
1964 GNI_ERRMASK_CRITICAL |
1965 GNI_ERRMASK_UNKNOWN_TRANSACTION,
1966 0, NULL, kgnilnd_critical_error,
1967 &dev->gnd_err_handle);
1968 if (rrc != GNI_RC_SUCCESS) {
1969 CERROR("Can't subscribe for errors on device %d: rc %d\n",
1971 GOTO(failed, rc = -ENODEV);
1974 rc = kgnilnd_set_quiesce_callback(dev->gnd_handle,
1975 kgnilnd_quiesce_end_callback);
1976 if (rc != GNI_RC_SUCCESS) {
1977 CERROR("Can't subscribe for quiesce callback on device %d: rc %d\n",
1979 GOTO(failed, rc = -ENODEV);
1983 rc = kgnilnd_nicaddr_to_nid(dev->gnd_host_id, &dev->gnd_nid);
1985 /* log messages during startup */
1986 if (kgnilnd_data.kgn_init < GNILND_INIT_ALL) {
1987 CERROR("couldn't translate host_id 0x%x to nid. rc %d\n",
1988 dev->gnd_host_id, rc);
1990 GOTO(failed, rc = -ESRCH);
1992 CDEBUG(D_NET, "NIC %x -> NID %d\n", dev->gnd_host_id, dev->gnd_nid);
1994 rrc = kgnilnd_cq_create(dev->gnd_handle, *kgnilnd_tunables.kgn_credits,
1995 0, kgnilnd_device_callback,
1996 dev->gnd_id, &dev->gnd_snd_rdma_cqh);
1997 if (rrc != GNI_RC_SUCCESS) {
1998 CERROR("Can't create rdma send cq size %u for device "
1999 "%d (%d)\n", cq_size, dev->gnd_id, rrc);
2000 GOTO(failed, rc = -EINVAL);
2003 rrc = kgnilnd_cq_create(dev->gnd_handle, cq_size,
2004 0, kgnilnd_device_callback, dev->gnd_id,
2005 &dev->gnd_snd_fma_cqh);
2006 if (rrc != GNI_RC_SUCCESS) {
2007 CERROR("Can't create fma send cq size %u for device %d (%d)\n",
2008 cq_size, dev->gnd_id, rrc);
2009 GOTO(failed, rc = -EINVAL);
2012 /* This one we size differently - overflows are possible and it needs to be
2013 * sized based on machine size */
2014 rrc = kgnilnd_cq_create(dev->gnd_handle,
2015 *kgnilnd_tunables.kgn_fma_cq_size,
2016 0, kgnilnd_device_callback, dev->gnd_id,
2017 &dev->gnd_rcv_fma_cqh);
2018 if (rrc != GNI_RC_SUCCESS) {
2019 CERROR("Can't create fma cq size %d for device %d (%d)\n",
2020 *kgnilnd_tunables.kgn_fma_cq_size, dev->gnd_id, rrc);
2021 GOTO(failed, rc = -EINVAL);
2024 rrc = kgnilnd_register_smdd_buf(dev);
2025 if (rrc != GNI_RC_SUCCESS) {
2026 GOTO(failed, rc = -EINVAL);
2032 kgnilnd_dev_fini(dev);
2037 kgnilnd_dev_fini(kgn_device_t *dev)
2042 /* At quiesce or rest time, need to loop through and clear gnd_ready_conns ?*/
2043 LASSERTF(list_empty(&dev->gnd_ready_conns) &&
2044 list_empty(&dev->gnd_map_tx) &&
2045 list_empty(&dev->gnd_rdmaq) &&
2046 list_empty(&dev->gnd_delay_conns),
2047 "dev 0x%p ready_conns %d@0x%p delay_conns %d@0x%p"
2048 "map_tx %d@0x%p rdmaq %d@0x%p\n",
2049 dev, kgnilnd_count_list(&dev->gnd_ready_conns), &dev->gnd_ready_conns,
2050 kgnilnd_count_list(&dev->gnd_delay_conns), &dev->gnd_delay_conns,
2051 kgnilnd_count_list(&dev->gnd_map_tx), &dev->gnd_map_tx,
2052 kgnilnd_count_list(&dev->gnd_rdmaq), &dev->gnd_rdmaq);
2054 /* These should follow from tearing down all connections */
2055 LASSERTF(dev->gnd_map_nphys == 0 && dev->gnd_map_physnop == 0,
2056 "%d physical mappings of %d pages still mapped\n",
2057 dev->gnd_map_nphys, dev->gnd_map_physnop);
2059 LASSERTF(dev->gnd_map_nvirt == 0 && dev->gnd_map_virtnob == 0,
2060 "%d virtual mappings of %llu bytes still mapped\n",
2061 dev->gnd_map_nvirt, dev->gnd_map_virtnob);
2063 LASSERTF(atomic_read(&dev->gnd_n_mdd) == 0 &&
2064 atomic_read(&dev->gnd_n_mdd_held) == 0 &&
2065 atomic64_read(&dev->gnd_nbytes_map) == 0,
2066 "%d SMSG mappings of %ld bytes still mapped or held %d\n",
2067 atomic_read(&dev->gnd_n_mdd),
2068 atomic64_read(&dev->gnd_nbytes_map), atomic_read(&dev->gnd_n_mdd_held));
2070 LASSERT(list_empty(&dev->gnd_map_list));
2072 /* What other assertions needed to ensure all connections torn down ? */
2074 /* check all counters == 0 (EP, MDD, etc) */
2076 /* if we are resetting due to quiese (stack reset), don't check
2078 LASSERTF(kgnilnd_data.kgn_quiesce_trigger ||
2079 atomic_read(&kgnilnd_data.kgn_nthreads) == 0,
2080 "tried to shutdown with threads active\n");
2082 if (dev->gnd_smdd_hold_buf) {
2083 rrc = kgnilnd_deregister_smdd_buf(dev);
2084 LASSERTF(rrc == GNI_RC_SUCCESS,
2085 "bad rc from deregistion of sMDD buffer: %d\n", rrc);
2086 dev->gnd_smdd_hold_buf = NULL;
2089 if (dev->gnd_rcv_fma_cqh) {
2090 rrc = kgnilnd_cq_destroy(dev->gnd_rcv_fma_cqh);
2091 LASSERTF(rrc == GNI_RC_SUCCESS,
2092 "bad rc from gni_cq_destroy on rcv_fma_cqh: %d\n", rrc);
2093 dev->gnd_rcv_fma_cqh = NULL;
2096 if (dev->gnd_snd_rdma_cqh) {
2097 rrc = kgnilnd_cq_destroy(dev->gnd_snd_rdma_cqh);
2098 LASSERTF(rrc == GNI_RC_SUCCESS,
2099 "bad rc from gni_cq_destroy on send_rdma_cqh: %d\n", rrc);
2100 dev->gnd_snd_rdma_cqh = NULL;
2103 if (dev->gnd_snd_fma_cqh) {
2104 rrc = kgnilnd_cq_destroy(dev->gnd_snd_fma_cqh);
2105 LASSERTF(rrc == GNI_RC_SUCCESS,
2106 "bad rc from gni_cq_destroy on snd_fma_cqh: %d\n", rrc);
2107 dev->gnd_snd_fma_cqh = NULL;
2110 if (dev->gnd_err_handle) {
2111 rrc = kgnilnd_release_errors(dev->gnd_err_handle);
2112 LASSERTF(rrc == GNI_RC_SUCCESS,
2113 "bad rc from gni_release_errors: %d\n", rrc);
2114 dev->gnd_err_handle = NULL;
2117 if (dev->gnd_domain) {
2118 rrc = kgnilnd_cdm_destroy(dev->gnd_domain);
2119 LASSERTF(rrc == GNI_RC_SUCCESS,
2120 "bad rc from gni_cdm_destroy: %d\n", rrc);
2121 dev->gnd_domain = NULL;
2127 int kgnilnd_base_startup(void)
2130 int pkmem = atomic_read(&libcfs_kmemory);
2134 struct task_struct *thrd;
2136 #if defined(CONFIG_CRAY_XT) && !defined(CONFIG_CRAY_COMPUTE)
2137 /* limit how much memory can be allocated for fma blocks in
2138 * instances where many nodes need to reconnects at the same time */
2141 kgnilnd_data.free_pages_limit = si.totalram/4;
2146 LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_NOTHING,
2147 "init %d\n", kgnilnd_data.kgn_init);
2149 /* zero pointers, flags etc */
2150 memset(&kgnilnd_data, 0, sizeof(kgnilnd_data));
2151 kgnilnd_check_kgni_version();
2153 /* CAVEAT EMPTOR: Every 'Fma' message includes the sender's NID and
2154 * a unique (for all time) connstamp so we can uniquely identify
2155 * the sender. The connstamp is an incrementing counter
2156 * initialised with seconds + microseconds at startup time. So we
2157 * rely on NOT creating connections more frequently on average than
2158 * 1MHz to ensure we don't use old connstamps when we reboot. */
2159 do_gettimeofday(&tv);
2160 kgnilnd_data.kgn_connstamp =
2161 kgnilnd_data.kgn_peerstamp =
2162 (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2164 init_rwsem(&kgnilnd_data.kgn_net_rw_sem);
2166 for (i = 0; i < GNILND_MAXDEVS; i++) {
2167 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2170 INIT_LIST_HEAD(&dev->gnd_ready_conns);
2171 INIT_LIST_HEAD(&dev->gnd_delay_conns);
2172 INIT_LIST_HEAD(&dev->gnd_map_tx);
2173 INIT_LIST_HEAD(&dev->gnd_fma_buffs);
2174 mutex_init(&dev->gnd_cq_mutex);
2175 mutex_init(&dev->gnd_fmablk_mutex);
2176 spin_lock_init(&dev->gnd_fmablk_lock);
2177 init_waitqueue_head(&dev->gnd_waitq);
2178 init_waitqueue_head(&dev->gnd_dgram_waitq);
2179 init_waitqueue_head(&dev->gnd_dgping_waitq);
2180 spin_lock_init(&dev->gnd_lock);
2181 INIT_LIST_HEAD(&dev->gnd_map_list);
2182 spin_lock_init(&dev->gnd_map_lock);
2183 atomic_set(&dev->gnd_nfmablk, 0);
2184 atomic_set(&dev->gnd_fmablk_vers, 1);
2185 atomic_set(&dev->gnd_neps, 0);
2186 atomic_set(&dev->gnd_canceled_dgrams, 0);
2187 INIT_LIST_HEAD(&dev->gnd_connd_peers);
2188 spin_lock_init(&dev->gnd_connd_lock);
2189 spin_lock_init(&dev->gnd_dgram_lock);
2190 spin_lock_init(&dev->gnd_rdmaq_lock);
2191 INIT_LIST_HEAD(&dev->gnd_rdmaq);
2192 init_rwsem(&dev->gnd_conn_sem);
2194 /* alloc & setup nid based dgram table */
2195 CFS_ALLOC_PTR_ARRAY(dev->gnd_dgrams,
2196 *kgnilnd_tunables.kgn_peer_hash_size);
2198 if (dev->gnd_dgrams == NULL)
2199 GOTO(failed, rc = -ENOMEM);
2201 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2202 INIT_LIST_HEAD(&dev->gnd_dgrams[i]);
2204 atomic_set(&dev->gnd_ndgrams, 0);
2205 atomic_set(&dev->gnd_nwcdgrams, 0);
2206 /* setup timer for RDMAQ processing */
2207 setup_timer(&dev->gnd_rdmaq_timer, kgnilnd_schedule_device_timer,
2208 (unsigned long)dev);
2210 /* setup timer for mapping processing */
2211 setup_timer(&dev->gnd_map_timer, kgnilnd_schedule_device_timer,
2212 (unsigned long)dev);
2216 /* CQID 0 isn't allowed, set to MAX_MSG_ID - 1 to check for conflicts early */
2217 kgnilnd_data.kgn_next_cqid = GNILND_MAX_MSG_ID - 1;
2218 kgnilnd_data.kgn_new_min_timeout = *kgnilnd_tunables.kgn_timeout;
2219 init_waitqueue_head(&kgnilnd_data.kgn_reaper_waitq);
2220 init_waitqueue_head(&kgnilnd_data.kgn_ruhroh_waitq);
2221 spin_lock_init(&kgnilnd_data.kgn_reaper_lock);
2223 mutex_init(&kgnilnd_data.kgn_quiesce_mutex);
2224 atomic_set(&kgnilnd_data.kgn_nquiesce, 0);
2225 atomic_set(&kgnilnd_data.kgn_npending_conns, 0);
2226 atomic_set(&kgnilnd_data.kgn_npending_unlink, 0);
2227 atomic_set(&kgnilnd_data.kgn_npending_detach, 0);
2228 atomic_set(&kgnilnd_data.kgn_rev_offset, 0);
2229 atomic_set(&kgnilnd_data.kgn_rev_length, 0);
2230 atomic_set(&kgnilnd_data.kgn_rev_copy_buff, 0);
2232 /* OK to call kgnilnd_api_shutdown() to cleanup now */
2233 kgnilnd_data.kgn_init = GNILND_INIT_DATA;
2234 if (!try_module_get(THIS_MODULE))
2235 GOTO(failed, rc = -ENOENT);
2237 rwlock_init(&kgnilnd_data.kgn_peer_conn_lock);
2239 CFS_ALLOC_PTR_ARRAY(kgnilnd_data.kgn_peers,
2240 *kgnilnd_tunables.kgn_peer_hash_size);
2242 if (kgnilnd_data.kgn_peers == NULL)
2243 GOTO(failed, rc = -ENOMEM);
2245 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2246 INIT_LIST_HEAD(&kgnilnd_data.kgn_peers[i]);
2249 CFS_ALLOC_PTR_ARRAY(kgnilnd_data.kgn_conns,
2250 *kgnilnd_tunables.kgn_peer_hash_size);
2252 if (kgnilnd_data.kgn_conns == NULL)
2253 GOTO(failed, rc = -ENOMEM);
2255 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2256 INIT_LIST_HEAD(&kgnilnd_data.kgn_conns[i]);
2259 CFS_ALLOC_PTR_ARRAY(kgnilnd_data.kgn_nets,
2260 *kgnilnd_tunables.kgn_net_hash_size);
2262 if (kgnilnd_data.kgn_nets == NULL)
2263 GOTO(failed, rc = -ENOMEM);
2265 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
2266 INIT_LIST_HEAD(&kgnilnd_data.kgn_nets[i]);
2269 kgnilnd_data.kgn_mbox_cache =
2270 kmem_cache_create("kgn_mbox_block", GNILND_MBOX_SIZE, 0,
2271 SLAB_HWCACHE_ALIGN, NULL);
2272 if (kgnilnd_data.kgn_mbox_cache == NULL) {
2273 CERROR("Can't create slab for physical mbox blocks\n");
2274 GOTO(failed, rc = -ENOMEM);
2277 kgnilnd_data.kgn_rx_cache =
2278 kmem_cache_create("kgn_rx_t", sizeof(kgn_rx_t), 0, 0, NULL);
2279 if (kgnilnd_data.kgn_rx_cache == NULL) {
2280 CERROR("Can't create slab for kgn_rx_t descriptors\n");
2281 GOTO(failed, rc = -ENOMEM);
2284 kgnilnd_data.kgn_tx_cache =
2285 kmem_cache_create("kgn_tx_t", sizeof(kgn_tx_t), 0, 0, NULL);
2286 if (kgnilnd_data.kgn_tx_cache == NULL) {
2287 CERROR("Can't create slab for kgn_tx_t\n");
2288 GOTO(failed, rc = -ENOMEM);
2291 kgnilnd_data.kgn_tx_phys_cache =
2292 kmem_cache_create("kgn_tx_phys",
2293 LNET_MAX_IOV * sizeof(gni_mem_segment_t),
2295 if (kgnilnd_data.kgn_tx_phys_cache == NULL) {
2296 CERROR("Can't create slab for kgn_tx_phys\n");
2297 GOTO(failed, rc = -ENOMEM);
2300 kgnilnd_data.kgn_dgram_cache =
2301 kmem_cache_create("kgn_dgram_t", sizeof(kgn_dgram_t), 0, 0, NULL);
2302 if (kgnilnd_data.kgn_dgram_cache == NULL) {
2303 CERROR("Can't create slab for outgoing datagrams\n");
2304 GOTO(failed, rc = -ENOMEM);
2307 /* allocate a MAX_IOV array of page pointers for each cpu */
2308 kgnilnd_data.kgn_cksum_map_pages = kmalloc(num_possible_cpus() * sizeof (struct page *),
2310 if (kgnilnd_data.kgn_cksum_map_pages == NULL) {
2311 CERROR("Can't allocate vmap cksum pages\n");
2312 GOTO(failed, rc = -ENOMEM);
2314 kgnilnd_data.kgn_cksum_npages = num_possible_cpus();
2315 memset(kgnilnd_data.kgn_cksum_map_pages, 0,
2316 kgnilnd_data.kgn_cksum_npages * sizeof (struct page *));
2318 for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
2319 kgnilnd_data.kgn_cksum_map_pages[i] = kmalloc(LNET_MAX_IOV * sizeof (struct page *),
2321 if (kgnilnd_data.kgn_cksum_map_pages[i] == NULL) {
2322 CERROR("Can't allocate vmap cksum pages for cpu %d\n", i);
2323 GOTO(failed, rc = -ENOMEM);
2327 LASSERT(kgnilnd_data.kgn_ndevs == 0);
2329 /* Use all available GNI devices */
2330 for (i = 0; i < GNILND_MAXDEVS; i++) {
2331 dev = &kgnilnd_data.kgn_devices[kgnilnd_data.kgn_ndevs];
2333 rc = kgnilnd_dev_init(dev);
2335 /* Increment here so base_shutdown cleans it up */
2336 kgnilnd_data.kgn_ndevs++;
2338 rc = kgnilnd_allocate_phys_fmablk(dev);
2344 if (kgnilnd_data.kgn_ndevs == 0) {
2345 CERROR("Can't initialise any GNI devices\n");
2346 GOTO(failed, rc = -ENODEV);
2349 rc = kgnilnd_thread_start(kgnilnd_reaper, NULL, "kgnilnd_rpr", 0);
2351 CERROR("Can't spawn gnilnd reaper: %d\n", rc);
2355 rc = kgnilnd_start_rca_thread();
2357 CERROR("Can't spawn gnilnd rca: %d\n", rc);
2362 * Start ruhroh thread. We can't use kgnilnd_thread_start() because
2363 * we don't want this thread included in kgnilnd_data.kgn_nthreads
2364 * count. This thread controls quiesce, so it mustn't
2367 thrd = kthread_run(kgnilnd_ruhroh_thread, NULL, "%s_%02d", "kgnilnd_rr", 0);
2370 CERROR("Can't spawn gnilnd ruhroh thread: %d\n", rc);
2374 /* threads will load balance across devs as they are available */
2375 if (*kgnilnd_tunables.kgn_thread_affinity) {
2376 rc = kgnilnd_start_sd_threads();
2380 for (i = 0; i < *kgnilnd_tunables.kgn_sched_threads; i++) {
2381 rc = kgnilnd_thread_start(kgnilnd_scheduler,
2385 CERROR("Can't spawn gnilnd scheduler[%d]: %d\n",
2392 for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2393 dev = &kgnilnd_data.kgn_devices[i];
2394 rc = kgnilnd_thread_start(kgnilnd_dgram_mover, dev,
2395 "kgnilnd_dg", dev->gnd_id);
2397 CERROR("Can't spawn gnilnd dgram_mover[%d]: %d\n",
2402 rc = kgnilnd_thread_start(kgnilnd_dgram_waitq, dev,
2403 "kgnilnd_dgn", dev->gnd_id);
2405 CERROR("Can't spawn gnilnd dgram_waitq[%d]: %d\n",
2410 rc = kgnilnd_setup_wildcard_dgram(dev);
2413 CERROR("Can't create wildcard dgrams[%d]: %d\n",
2419 /* flag everything initialised */
2420 kgnilnd_data.kgn_init = GNILND_INIT_ALL;
2421 /*****************************************************/
2423 CDEBUG(D_MALLOC, "initial kmem %d\n", pkmem);
2427 kgnilnd_base_shutdown();
2428 kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
2433 kgnilnd_base_shutdown(void)
2438 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_PAUSE_SHUTDOWN, 1)) {};
2440 kgnilnd_data.kgn_wc_kill = 1;
2442 for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2443 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2444 kgnilnd_cancel_wc_dgrams(dev);
2445 kgnilnd_cancel_dgrams(dev);
2446 kgnilnd_del_conn_or_peer(NULL, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
2447 kgnilnd_wait_for_canceled_dgrams(dev);
2450 /* We need to verify there are no conns left before we let the threads
2451 * shut down otherwise we could clean up the peers but still have
2452 * some outstanding conns due to orphaned datagram conns that are
2456 while (atomic_read(&kgnilnd_data.kgn_nconns) != 0) {
2459 for(j = 0; j < kgnilnd_data.kgn_ndevs; ++j) {
2460 kgn_device_t *dev = &kgnilnd_data.kgn_devices[j];
2461 kgnilnd_schedule_device(dev);
2464 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2465 "Waiting for conns to be cleaned up %d\n",atomic_read(&kgnilnd_data.kgn_nconns));
2466 schedule_timeout_uninterruptible(cfs_time_seconds(1));
2468 /* Peer state all cleaned up BEFORE setting shutdown, so threads don't
2469 * have to worry about shutdown races. NB connections may be created
2470 * while there are still active connds, but these will be temporary
2471 * since peer creation always fails after the listener has started to
2473 * all peers should have been cleared out on the nets */
2474 LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
2475 "peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
2477 /* Wait for the ruhroh thread to shut down. */
2478 kgnilnd_data.kgn_ruhroh_shutdown = 1;
2479 wake_up(&kgnilnd_data.kgn_ruhroh_waitq);
2481 while (kgnilnd_data.kgn_ruhroh_running != 0) {
2483 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2484 "Waiting for ruhroh thread to terminate\n");
2485 schedule_timeout_uninterruptible(cfs_time_seconds(1));
2488 /* Flag threads to terminate */
2489 kgnilnd_data.kgn_shutdown = 1;
2491 for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2492 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2494 /* should clear all the MDDs */
2495 kgnilnd_unmap_fma_blocks(dev);
2497 kgnilnd_schedule_device(dev);
2498 wake_up_all(&dev->gnd_dgram_waitq);
2499 wake_up_all(&dev->gnd_dgping_waitq);
2500 LASSERT(list_empty(&dev->gnd_connd_peers));
2503 spin_lock(&kgnilnd_data.kgn_reaper_lock);
2504 wake_up_all(&kgnilnd_data.kgn_reaper_waitq);
2505 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
2507 if (atomic_read(&kgnilnd_data.kgn_nthreads))
2508 kgnilnd_wakeup_rca_thread();
2510 /* Wait for threads to exit */
2512 while (atomic_read(&kgnilnd_data.kgn_nthreads) != 0) {
2514 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2515 "Waiting for %d threads to terminate\n",
2516 atomic_read(&kgnilnd_data.kgn_nthreads));
2517 schedule_timeout_uninterruptible(cfs_time_seconds(1));
2520 LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
2521 "peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
2523 if (kgnilnd_data.kgn_peers != NULL) {
2524 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2525 LASSERT(list_empty(&kgnilnd_data.kgn_peers[i]));
2527 CFS_FREE_PTRE_ARRAT(kgnilnd_data.kgn_peers,
2528 *kgnilnd_tunables.kgn_peer_hash_size);
2531 down_write(&kgnilnd_data.kgn_net_rw_sem);
2532 if (kgnilnd_data.kgn_nets != NULL) {
2533 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++)
2534 LASSERT(list_empty(&kgnilnd_data.kgn_nets[i]));
2536 CFS_FREE_PTRE_ARRAY(kgnilnd_data.kgn_nets,
2537 *kgnilnd_tunables.kgn_net_hash_size);
2539 up_write(&kgnilnd_data.kgn_net_rw_sem);
2541 LASSERTF(atomic_read(&kgnilnd_data.kgn_nconns) == 0,
2542 "conns left %d\n", atomic_read(&kgnilnd_data.kgn_nconns));
2544 if (kgnilnd_data.kgn_conns != NULL) {
2545 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2546 LASSERT(list_empty(&kgnilnd_data.kgn_conns[i]));
2548 CFS_FREE_PTR_ARRAY(kgnilnd_data.kgn_conns,
2549 *kgnilnd_tunables.kgn_peer_hash_size);
2552 for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2553 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2554 kgnilnd_dev_fini(dev);
2556 LASSERTF(atomic_read(&dev->gnd_ndgrams) == 0,
2557 "dgrams left %d\n", atomic_read(&dev->gnd_ndgrams));
2559 if (dev->gnd_dgrams != NULL) {
2560 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size;
2562 LASSERT(list_empty(&dev->gnd_dgrams[i]));
2564 CFS_FREE_PTR_ARRAY(dev->gnd_dgrams,
2565 *kgnilnd_tunables.kgn_peer_hash_size);
2568 kgnilnd_free_phys_fmablk(dev);
2571 if (kgnilnd_data.kgn_mbox_cache != NULL)
2572 kmem_cache_destroy(kgnilnd_data.kgn_mbox_cache);
2574 if (kgnilnd_data.kgn_rx_cache != NULL)
2575 kmem_cache_destroy(kgnilnd_data.kgn_rx_cache);
2577 if (kgnilnd_data.kgn_tx_cache != NULL)
2578 kmem_cache_destroy(kgnilnd_data.kgn_tx_cache);
2580 if (kgnilnd_data.kgn_tx_phys_cache != NULL)
2581 kmem_cache_destroy(kgnilnd_data.kgn_tx_phys_cache);
2583 if (kgnilnd_data.kgn_dgram_cache != NULL)
2584 kmem_cache_destroy(kgnilnd_data.kgn_dgram_cache);
2586 if (kgnilnd_data.kgn_cksum_map_pages != NULL) {
2587 for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
2588 if (kgnilnd_data.kgn_cksum_map_pages[i] != NULL) {
2589 kfree(kgnilnd_data.kgn_cksum_map_pages[i]);
2592 kfree(kgnilnd_data.kgn_cksum_map_pages);
2595 CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2596 atomic_read(&libcfs_kmemory));
2598 kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
2599 module_put(THIS_MODULE);
2605 kgnilnd_startup(struct lnet_ni *ni)
2611 LASSERTF(ni->ni_net->net_lnd == &the_kgnilnd,
2612 "bad LND 0x%p != the_kgnilnd @ 0x%p\n",
2613 ni->ni_net->net_lnd, &the_kgnilnd);
2615 if (kgnilnd_data.kgn_init == GNILND_INIT_NOTHING) {
2616 rc = kgnilnd_base_startup();
2621 /* Serialize with shutdown. */
2622 mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
2624 LIBCFS_ALLOC(net, sizeof(*net));
2626 CERROR("could not allocate net for new interface instance\n");
2627 /* no need to cleanup the CDM... */
2628 GOTO(failed, rc = -ENOMEM);
2630 INIT_LIST_HEAD(&net->gnn_list);
2633 if (!ni->ni_net->net_tunables_set) {
2634 ni->ni_net->net_tunables.lct_max_tx_credits =
2635 *kgnilnd_tunables.kgn_credits;
2636 ni->ni_net->net_tunables.lct_peer_tx_credits =
2637 *kgnilnd_tunables.kgn_peer_credits;
2640 if (*kgnilnd_tunables.kgn_peer_health) {
2643 /* give this a bit of leeway - we don't have a hard timeout
2644 * as we only check timeouts periodically - see comment in kgnilnd_reaper */
2645 fudge = (GNILND_TO2KA(*kgnilnd_tunables.kgn_timeout) / GNILND_REAPER_NCHECKS);
2646 timeout = *kgnilnd_tunables.kgn_timeout + fudge;
2648 if (*kgnilnd_tunables.kgn_peer_timeout >= timeout) {
2649 ni->ni_net->net_tunables.lct_peer_timeout =
2650 *kgnilnd_tunables.kgn_peer_timeout;
2651 } else if (*kgnilnd_tunables.kgn_peer_timeout > -1) {
2652 LCONSOLE_ERROR("Peer_timeout is set to %d but needs to be >= %d\n",
2653 *kgnilnd_tunables.kgn_peer_timeout,
2656 LIBCFS_FREE(net, sizeof(*net));
2657 GOTO(failed, rc = -EINVAL);
2659 ni->ni_net->net_tunables.lct_peer_timeout = timeout;
2661 LCONSOLE_INFO("Enabling LNet peer health for gnilnd, timeout %ds\n",
2662 ni->ni_net->net_tunables.lct_peer_timeout);
2665 atomic_set(&net->gnn_refcount, 1);
2667 /* if we have multiple devices, spread the nets around */
2668 net->gnn_netnum = LNET_NETNUM(LNET_NIDNET(ni->ni_nid));
2670 devno = LNET_NIDNET(ni->ni_nid) % GNILND_MAXDEVS;
2671 net->gnn_dev = &kgnilnd_data.kgn_devices[devno];
2673 /* allocate a 'dummy' cdm for datagram use. We can only have a single
2674 * datagram between a nid:inst_id and nid2:inst_id. The fake cdm
2675 * give us additional inst_id to use, allowing the datagrams to flow
2676 * like rivers of honey and beer */
2678 /* the instance id for the cdm is the NETNUM offset by MAXDEVS -
2679 * ensuring we'll have a unique id */
2682 ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), net->gnn_dev->gnd_nid);
2683 CDEBUG(D_NET, "adding net %p nid=%s on dev %d \n",
2684 net, libcfs_nid2str(ni->ni_nid), net->gnn_dev->gnd_id);
2685 /* until the gnn_list is set, we need to cleanup ourselves as
2686 * kgnilnd_shutdown is just gonna get confused */
2688 down_write(&kgnilnd_data.kgn_net_rw_sem);
2689 list_add_tail(&net->gnn_list, kgnilnd_netnum2netlist(net->gnn_netnum));
2690 up_write(&kgnilnd_data.kgn_net_rw_sem);
2692 /* we need a separate thread to call probe_wait_by_id until
2693 * we get a function callback notifier from kgni */
2694 mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2697 mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2698 kgnilnd_shutdown(ni);
2703 kgnilnd_shutdown(struct lnet_ni *ni)
2705 kgn_net_t *net = ni->ni_data;
2710 CFS_RACE(CFS_FAIL_GNI_SR_DOWN_RACE);
2712 LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_ALL,
2713 "init %d\n", kgnilnd_data.kgn_init);
2715 /* Serialize with startup. */
2716 mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
2717 CDEBUG(D_MALLOC, "before NAL cleanup: kmem %d\n",
2718 atomic_read(&libcfs_kmemory));
2721 CERROR("got NULL net for ni %p\n", ni);
2722 GOTO(out, rc = -EINVAL);
2725 LASSERTF(ni == net->gnn_ni,
2726 "ni %p gnn_ni %p\n", net, net->gnn_ni);
2730 LASSERT(!net->gnn_shutdown);
2731 LASSERTF(atomic_read(&net->gnn_refcount) != 0,
2732 "net %p refcount %d\n",
2733 net, atomic_read(&net->gnn_refcount));
2735 if (!list_empty(&net->gnn_list)) {
2736 /* serialize with peer creation */
2737 down_write(&kgnilnd_data.kgn_net_rw_sem);
2738 net->gnn_shutdown = 1;
2739 up_write(&kgnilnd_data.kgn_net_rw_sem);
2741 kgnilnd_cancel_net_dgrams(net);
2743 kgnilnd_del_conn_or_peer(net, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
2745 /* if we are quiesced, need to wake up - we need those threads
2746 * alive to release peers, etc */
2747 if (GNILND_IS_QUIESCED) {
2748 set_mb(kgnilnd_data.kgn_quiesce_trigger, GNILND_QUIESCE_IDLE);
2749 kgnilnd_quiesce_wait("shutdown");
2752 kgnilnd_wait_for_canceled_dgrams(net->gnn_dev);
2754 /* We wait until the nets ref's are 1, we will release final ref which is ours
2755 * this allows us to make sure everything else is done before we free the
2759 while (atomic_read(&net->gnn_refcount) != 1) {
2761 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2762 "Waiting for %d references to clear on net %d\n",
2763 atomic_read(&net->gnn_refcount),
2765 schedule_timeout_uninterruptible(cfs_time_seconds(1));
2768 /* release ref from kgnilnd_startup */
2769 kgnilnd_net_decref(net);
2770 /* serialize with reaper and conn_task looping */
2771 down_write(&kgnilnd_data.kgn_net_rw_sem);
2772 list_del_init(&net->gnn_list);
2773 up_write(&kgnilnd_data.kgn_net_rw_sem);
2777 /* not locking, this can't race with writers */
2778 LASSERTF(atomic_read(&net->gnn_refcount) == 0,
2779 "net %p refcount %d\n",
2780 net, atomic_read(&net->gnn_refcount));
2781 LIBCFS_FREE(net, sizeof(*net));
2784 down_read(&kgnilnd_data.kgn_net_rw_sem);
2785 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
2786 if (!list_empty(&kgnilnd_data.kgn_nets[i])) {
2787 up_read(&kgnilnd_data.kgn_net_rw_sem);
2791 if (i == *kgnilnd_tunables.kgn_net_hash_size - 1) {
2792 up_read(&kgnilnd_data.kgn_net_rw_sem);
2793 kgnilnd_base_shutdown();
2796 CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2797 atomic_read(&libcfs_kmemory));
2799 mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2803 static void __exit kgnilnd_exit(void)
2805 lnet_unregister_lnd(&the_kgnilnd);
2806 kgnilnd_proc_fini();
2807 kgnilnd_remove_sysctl();
2810 static int __init kgnilnd_init(void)
2814 rc = kgnilnd_tunables_init();
2818 LCONSOLE_INFO("Lustre: kgnilnd build version: "LUSTRE_VERSION_STRING"\n");
2820 kgnilnd_insert_sysctl();
2821 kgnilnd_proc_init();
2823 lnet_register_lnd(&the_kgnilnd);
2828 MODULE_AUTHOR("Cray, Inc. <nic@cray.com>");
2829 MODULE_DESCRIPTION("Gemini LNet Network Driver");
2830 MODULE_VERSION(LUSTRE_VERSION_STRING);
2831 MODULE_LICENSE("GPL");
2833 module_init(kgnilnd_init);
2834 module_exit(kgnilnd_exit);