2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
4 * Copyright (c) 2011, 2014, Intel Corporation.
6 * Author: Zach Brown <zab@zabbo.net>
7 * Author: Peter J. Braam <braam@clusterfs.com>
8 * Author: Phil Schwan <phil@clusterfs.com>
9 * Author: Eric Barton <eric@bartonsoftware.com>
11 * This file is part of Lustre, https://wiki.hpdd.intel.com/
13 * Portals is free software; you can redistribute it and/or
14 * modify it under the terms of version 2 of the GNU General Public
15 * License as published by the Free Software Foundation.
17 * Portals is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with Portals; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 ksocknal_alloc_tx(int type, int size)
32 ksock_tx_t *tx = NULL;
34 if (type == KSOCK_MSG_NOOP) {
35 LASSERT(size == KSOCK_NOOP_TX_SIZE);
37 /* searching for a noop tx in free list */
38 spin_lock(&ksocknal_data.ksnd_tx_lock);
40 if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
41 tx = list_entry(ksocknal_data.ksnd_idle_noop_txs. \
42 next, ksock_tx_t, tx_list);
43 LASSERT(tx->tx_desc_size == size);
44 list_del(&tx->tx_list);
47 spin_unlock(&ksocknal_data.ksnd_tx_lock);
51 LIBCFS_ALLOC(tx, size);
56 atomic_set(&tx->tx_refcount, 1);
57 tx->tx_zc_aborted = 0;
58 tx->tx_zc_capable = 0;
59 tx->tx_zc_checked = 0;
60 tx->tx_desc_size = size;
62 atomic_inc(&ksocknal_data.ksnd_nactive_txs);
68 ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
72 tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
74 CERROR("Can't allocate noop tx desc\n");
79 tx->tx_lnetmsg = NULL;
82 tx->tx_iov = tx->tx_frags.virt.iov;
84 tx->tx_nonblk = nonblk;
86 tx->tx_msg.ksm_csum = 0;
87 tx->tx_msg.ksm_type = KSOCK_MSG_NOOP;
88 tx->tx_msg.ksm_zc_cookies[0] = 0;
89 tx->tx_msg.ksm_zc_cookies[1] = cookie;
96 ksocknal_free_tx (ksock_tx_t *tx)
98 atomic_dec(&ksocknal_data.ksnd_nactive_txs);
100 if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
102 spin_lock(&ksocknal_data.ksnd_tx_lock);
104 list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
106 spin_unlock(&ksocknal_data.ksnd_tx_lock);
108 LIBCFS_FREE(tx, tx->tx_desc_size);
113 ksocknal_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
115 struct kvec *iov = tx->tx_iov;
119 LASSERT (tx->tx_niov > 0);
121 /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */
122 rc = ksocknal_lib_send_iov(conn, tx);
124 if (rc <= 0) /* sent nothing? */
128 LASSERT (nob <= tx->tx_resid);
133 LASSERT (tx->tx_niov > 0);
135 if (nob < (int) iov->iov_len) {
136 iov->iov_base += nob;
150 ksocknal_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
152 lnet_kiov_t *kiov = tx->tx_kiov;
156 LASSERT (tx->tx_niov == 0);
157 LASSERT (tx->tx_nkiov > 0);
159 /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
160 rc = ksocknal_lib_send_kiov(conn, tx);
162 if (rc <= 0) /* sent nothing? */
166 LASSERT (nob <= tx->tx_resid);
171 LASSERT(tx->tx_nkiov > 0);
173 if (nob < (int)kiov->kiov_len) {
174 kiov->kiov_offset += nob;
175 kiov->kiov_len -= nob;
179 nob -= (int)kiov->kiov_len;
180 tx->tx_kiov = ++kiov;
188 ksocknal_transmit(ksock_conn_t *conn, ksock_tx_t *tx)
193 if (ksocknal_data.ksnd_stall_tx != 0) {
194 set_current_state(TASK_UNINTERRUPTIBLE);
195 schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
198 LASSERT(tx->tx_resid != 0);
200 rc = ksocknal_connsock_addref(conn);
202 LASSERT (conn->ksnc_closing);
207 if (ksocknal_data.ksnd_enomem_tx > 0) {
209 ksocknal_data.ksnd_enomem_tx--;
211 } else if (tx->tx_niov != 0) {
212 rc = ksocknal_send_iov (conn, tx);
214 rc = ksocknal_send_kiov (conn, tx);
217 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
218 if (rc > 0) /* sent something? */
219 conn->ksnc_tx_bufnob += rc; /* account it */
221 if (bufnob < conn->ksnc_tx_bufnob) {
222 /* allocated send buffer bytes < computed; infer
223 * something got ACKed */
224 conn->ksnc_tx_deadline =
225 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
226 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
227 conn->ksnc_tx_bufnob = bufnob;
231 if (rc <= 0) { /* Didn't write anything? */
233 if (rc == 0) /* some stacks return 0 instead of -EAGAIN */
236 /* Check if EAGAIN is due to memory pressure */
237 if(rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
243 /* socket's wmem_queued now includes 'rc' bytes */
244 atomic_sub (rc, &conn->ksnc_tx_nob);
247 } while (tx->tx_resid != 0);
249 ksocknal_connsock_decref(conn);
254 ksocknal_recv_iov (ksock_conn_t *conn)
256 struct kvec *iov = conn->ksnc_rx_iov;
260 LASSERT (conn->ksnc_rx_niov > 0);
262 /* Never touch conn->ksnc_rx_iov or change connection
263 * status inside ksocknal_lib_recv_iov */
264 rc = ksocknal_lib_recv_iov(conn);
269 /* received something... */
272 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
273 conn->ksnc_rx_deadline =
274 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
275 smp_mb(); /* order with setting rx_started */
276 conn->ksnc_rx_started = 1;
278 conn->ksnc_rx_nob_wanted -= nob;
279 conn->ksnc_rx_nob_left -= nob;
282 LASSERT (conn->ksnc_rx_niov > 0);
284 if (nob < (int)iov->iov_len) {
286 iov->iov_base += nob;
291 conn->ksnc_rx_iov = ++iov;
292 conn->ksnc_rx_niov--;
299 ksocknal_recv_kiov (ksock_conn_t *conn)
301 lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
304 LASSERT (conn->ksnc_rx_nkiov > 0);
306 /* Never touch conn->ksnc_rx_kiov or change connection
307 * status inside ksocknal_lib_recv_iov */
308 rc = ksocknal_lib_recv_kiov(conn);
313 /* received something... */
316 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
317 conn->ksnc_rx_deadline =
318 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
319 smp_mb(); /* order with setting rx_started */
320 conn->ksnc_rx_started = 1;
322 conn->ksnc_rx_nob_wanted -= nob;
323 conn->ksnc_rx_nob_left -= nob;
326 LASSERT (conn->ksnc_rx_nkiov > 0);
328 if (nob < (int) kiov->kiov_len) {
329 kiov->kiov_offset += nob;
330 kiov->kiov_len -= nob;
334 nob -= kiov->kiov_len;
335 conn->ksnc_rx_kiov = ++kiov;
336 conn->ksnc_rx_nkiov--;
343 ksocknal_receive (ksock_conn_t *conn)
345 /* Return 1 on success, 0 on EOF, < 0 on error.
346 * Caller checks ksnc_rx_nob_wanted to determine
347 * progress/completion. */
351 if (ksocknal_data.ksnd_stall_rx != 0) {
352 set_current_state(TASK_UNINTERRUPTIBLE);
353 schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
356 rc = ksocknal_connsock_addref(conn);
358 LASSERT (conn->ksnc_closing);
363 if (conn->ksnc_rx_niov != 0)
364 rc = ksocknal_recv_iov (conn);
366 rc = ksocknal_recv_kiov (conn);
369 /* error/EOF or partial receive */
372 } else if (rc == 0 && conn->ksnc_rx_started) {
373 /* EOF in the middle of a message */
379 /* Completed a fragment */
381 if (conn->ksnc_rx_nob_wanted == 0) {
387 ksocknal_connsock_decref(conn);
392 ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
394 lnet_msg_t *lnetmsg = tx->tx_lnetmsg;
395 int rc = (tx->tx_resid == 0 && !tx->tx_zc_aborted) ? 0 : -EIO;
398 LASSERT(ni != NULL || tx->tx_conn != NULL);
400 if (tx->tx_conn != NULL)
401 ksocknal_conn_decref(tx->tx_conn);
403 if (ni == NULL && tx->tx_conn != NULL)
404 ni = tx->tx_conn->ksnc_peer->ksnp_ni;
406 ksocknal_free_tx (tx);
407 if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */
408 lnet_finalize (ni, lnetmsg, rc);
414 ksocknal_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int error)
418 while (!list_empty(txlist)) {
419 tx = list_entry(txlist->next, ksock_tx_t, tx_list);
421 if (error && tx->tx_lnetmsg != NULL) {
422 CNETERR("Deleting packet type %d len %d %s->%s\n",
423 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
424 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
425 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
426 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
428 CNETERR("Deleting noop packet\n");
431 list_del(&tx->tx_list);
433 LASSERT (atomic_read(&tx->tx_refcount) == 1);
434 ksocknal_tx_done (ni, tx);
439 ksocknal_check_zc_req(ksock_tx_t *tx)
441 ksock_conn_t *conn = tx->tx_conn;
442 ksock_peer_t *peer = conn->ksnc_peer;
444 /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
445 * to ksnp_zc_req_list if some fragment of this message should be sent
446 * zero-copy. Our peer will send an ACK containing this cookie when
447 * she has received this message to tell us we can signal completion.
448 * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
449 * ksnp_zc_req_list. */
450 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
451 LASSERT (tx->tx_zc_capable);
453 tx->tx_zc_checked = 1;
455 if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
456 !conn->ksnc_zc_capable)
459 /* assign cookie and queue tx to pending list, it will be released when
460 * a matching ack is received. See ksocknal_handle_zcack() */
462 ksocknal_tx_addref(tx);
464 spin_lock(&peer->ksnp_lock);
466 /* ZC_REQ is going to be pinned to the peer */
468 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
470 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
472 tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
474 if (peer->ksnp_zc_next_cookie == 0)
475 peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
477 list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
479 spin_unlock(&peer->ksnp_lock);
483 ksocknal_uncheck_zc_req(ksock_tx_t *tx)
485 ksock_peer_t *peer = tx->tx_conn->ksnc_peer;
487 LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
488 LASSERT(tx->tx_zc_capable);
490 tx->tx_zc_checked = 0;
492 spin_lock(&peer->ksnp_lock);
494 if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
495 /* Not waiting for an ACK */
496 spin_unlock(&peer->ksnp_lock);
500 tx->tx_msg.ksm_zc_cookies[0] = 0;
501 list_del(&tx->tx_zc_list);
503 spin_unlock(&peer->ksnp_lock);
505 ksocknal_tx_decref(tx);
509 ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
513 if (tx->tx_zc_capable && !tx->tx_zc_checked)
514 ksocknal_check_zc_req(tx);
516 rc = ksocknal_transmit (conn, tx);
518 CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc);
520 if (tx->tx_resid == 0) {
521 /* Sent everything OK */
533 counter++; /* exponential backoff warnings */
534 if ((counter & (-counter)) == counter)
535 CWARN("%u ENOMEM tx %p (%u allocated)\n",
536 counter, conn, atomic_read(&libcfs_kmemory));
538 /* Queue on ksnd_enomem_conns for retry after a timeout */
539 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
541 /* enomem list takes over scheduler's ref... */
542 LASSERT (conn->ksnc_tx_scheduled);
543 list_add_tail(&conn->ksnc_tx_list,
544 &ksocknal_data.ksnd_enomem_conns);
545 if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
546 SOCKNAL_ENOMEM_RETRY),
547 ksocknal_data.ksnd_reaper_waketime))
548 wake_up(&ksocknal_data.ksnd_reaper_waitq);
550 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
557 if (!conn->ksnc_closing) {
560 LCONSOLE_WARN("Host %pI4h reset our connection "
561 "while we were sending data; it may have "
566 LCONSOLE_WARN("There was an unexpected network error "
567 "while writing to %pI4h: %d.\n",
568 &conn->ksnc_ipaddr, rc);
571 CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pI4h:%d\n",
572 conn, rc, libcfs_id2str(conn->ksnc_peer->ksnp_id),
573 &conn->ksnc_ipaddr, conn->ksnc_port);
576 if (tx->tx_zc_checked)
577 ksocknal_uncheck_zc_req(tx);
579 /* it's not an error if conn is being closed */
580 ksocknal_close_conn_and_siblings (conn,
581 (conn->ksnc_closing) ? 0 : rc);
587 ksocknal_launch_connection_locked (ksock_route_t *route)
590 /* called holding write lock on ksnd_global_lock */
592 LASSERT (!route->ksnr_scheduled);
593 LASSERT (!route->ksnr_connecting);
594 LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
596 route->ksnr_scheduled = 1; /* scheduling conn for connd */
597 ksocknal_route_addref(route); /* extra ref for connd */
599 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
601 list_add_tail(&route->ksnr_connd_list,
602 &ksocknal_data.ksnd_connd_routes);
603 wake_up(&ksocknal_data.ksnd_connd_waitq);
605 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
609 ksocknal_launch_all_connections_locked (ksock_peer_t *peer)
611 ksock_route_t *route;
613 /* called holding write lock on ksnd_global_lock */
615 /* launch any/all connections that need it */
616 route = ksocknal_find_connectable_route_locked(peer);
620 ksocknal_launch_connection_locked(route);
625 ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk)
627 struct list_head *tmp;
629 ksock_conn_t *typed = NULL;
630 ksock_conn_t *fallback = NULL;
634 list_for_each(tmp, &peer->ksnp_conns) {
635 ksock_conn_t *c = list_entry(tmp, ksock_conn_t, ksnc_list);
636 int nob = atomic_read(&c->ksnc_tx_nob) +
637 c->ksnc_sock->sk->sk_wmem_queued;
640 LASSERT (!c->ksnc_closing);
641 LASSERT (c->ksnc_proto != NULL &&
642 c->ksnc_proto->pro_match_tx != NULL);
644 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
649 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
652 case SOCKNAL_MATCH_YES: /* typed connection */
653 if (typed == NULL || tnob > nob ||
654 (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
655 cfs_time_after(typed->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
661 case SOCKNAL_MATCH_MAY: /* fallback connection */
662 if (fallback == NULL || fnob > nob ||
663 (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
664 cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
672 /* prefer the typed selection */
673 conn = (typed != NULL) ? typed : fallback;
676 conn->ksnc_tx_last_post = cfs_time_current();
682 ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *tx)
684 conn->ksnc_proto->pro_pack(tx);
686 atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
687 ksocknal_conn_addref(conn); /* +1 ref for tx */
692 ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn)
694 ksock_sched_t *sched = conn->ksnc_scheduler;
695 struct ksock_msg *msg = &tx->tx_msg;
696 ksock_tx_t *ztx = NULL;
699 /* called holding global lock (read or irq-write) and caller may
700 * not have dropped this lock between finding conn and calling me,
701 * so we don't need the {get,put}connsock dance to deref
703 LASSERT(!conn->ksnc_closing);
705 CDEBUG(D_NET, "Sending to %s ip %pI4h:%d\n",
706 libcfs_id2str(conn->ksnc_peer->ksnp_id),
707 &conn->ksnc_ipaddr, conn->ksnc_port);
709 ksocknal_tx_prep(conn, tx);
711 /* Ensure the frags we've been given EXACTLY match the number of
712 * bytes we want to send. Many TCP/IP stacks disregard any total
713 * size parameters passed to them and just look at the frags.
715 * We always expect at least 1 mapped fragment containing the
716 * complete ksocknal message header. */
717 LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
718 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
719 (unsigned int)tx->tx_nob);
720 LASSERT (tx->tx_niov >= 1);
721 LASSERT (tx->tx_resid == tx->tx_nob);
723 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
724 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
726 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
728 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
729 spin_lock_bh(&sched->kss_lock);
731 if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
732 /* First packet starts the timeout */
733 conn->ksnc_tx_deadline =
734 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
735 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
736 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
737 conn->ksnc_tx_bufnob = 0;
738 smp_mb(); /* order with adding to tx_queue */
741 if (msg->ksm_type == KSOCK_MSG_NOOP) {
742 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
743 * on a normal packet so I don't need to send it */
744 LASSERT (msg->ksm_zc_cookies[1] != 0);
745 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
747 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
748 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
751 /* It's a normal packet - can it piggback a noop zc-ack that
752 * has been queued already? */
753 LASSERT (msg->ksm_zc_cookies[1] == 0);
754 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
756 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
757 /* ztx will be released later */
761 atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
762 list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
765 if (conn->ksnc_tx_ready && /* able to send */
766 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
767 /* +1 ref for scheduler */
768 ksocknal_conn_addref(conn);
769 list_add_tail(&conn->ksnc_tx_list,
770 &sched->kss_tx_conns);
771 conn->ksnc_tx_scheduled = 1;
772 wake_up(&sched->kss_waitq);
775 spin_unlock_bh(&sched->kss_lock);
780 ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
782 cfs_time_t now = cfs_time_current();
783 struct list_head *tmp;
784 ksock_route_t *route;
786 list_for_each(tmp, &peer->ksnp_routes) {
787 route = list_entry(tmp, ksock_route_t, ksnr_list);
789 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
791 if (route->ksnr_scheduled) /* connections being established */
794 /* all route types connected ? */
795 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
798 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
799 cfs_time_aftereq(now, route->ksnr_timeout))) {
801 "Too soon to retry route %pI4h "
802 "(cnted %d, interval %ld, %ld secs later)\n",
804 route->ksnr_connected,
805 route->ksnr_retry_interval,
806 cfs_duration_sec(route->ksnr_timeout - now));
817 ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
819 struct list_head *tmp;
820 ksock_route_t *route;
822 list_for_each(tmp, &peer->ksnp_routes) {
823 route = list_entry(tmp, ksock_route_t, ksnr_list);
825 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
827 if (route->ksnr_scheduled)
835 ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
843 LASSERT (tx->tx_conn == NULL);
845 g_lock = &ksocknal_data.ksnd_global_lock;
847 for (retry = 0;; retry = 1) {
849 peer = ksocknal_find_peer_locked(ni, id);
851 if (ksocknal_find_connectable_route_locked(peer) == NULL) {
852 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
854 /* I've got no routes that need to be
855 * connecting and I do have an actual
857 ksocknal_queue_tx_locked (tx, conn);
864 /* I'll need a write lock... */
867 write_lock_bh(g_lock);
869 peer = ksocknal_find_peer_locked(ni, id);
873 write_unlock_bh(g_lock);
875 if ((id.pid & LNET_PID_USERFLAG) != 0) {
876 CERROR("Refusing to create a connection to "
877 "userspace process %s\n", libcfs_id2str(id));
878 return -EHOSTUNREACH;
882 CERROR("Can't find peer %s\n", libcfs_id2str(id));
883 return -EHOSTUNREACH;
886 rc = ksocknal_add_peer(ni, id,
887 LNET_NIDADDR(id.nid),
888 lnet_acceptor_port());
890 CERROR("Can't add peer %s: %d\n",
891 libcfs_id2str(id), rc);
896 ksocknal_launch_all_connections_locked(peer);
898 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
900 /* Connection exists; queue message on it */
901 ksocknal_queue_tx_locked (tx, conn);
902 write_unlock_bh(g_lock);
906 if (peer->ksnp_accepting > 0 ||
907 ksocknal_find_connecting_route_locked (peer) != NULL) {
908 /* the message is going to be pinned to the peer */
910 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
912 /* Queue the message until a connection is established */
913 list_add_tail(&tx->tx_list, &peer->ksnp_tx_queue);
914 write_unlock_bh(g_lock);
918 write_unlock_bh(g_lock);
920 /* NB Routes may be ignored if connections to them failed recently */
921 CNETERR("No usable routes to %s\n", libcfs_id2str(id));
922 return (-EHOSTUNREACH);
926 ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
929 int type = lntmsg->msg_type;
930 lnet_process_id_t target = lntmsg->msg_target;
931 unsigned int payload_niov = lntmsg->msg_niov;
932 struct kvec *payload_iov = lntmsg->msg_iov;
933 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
934 unsigned int payload_offset = lntmsg->msg_offset;
935 unsigned int payload_nob = lntmsg->msg_len;
940 /* NB 'private' is different depending on what we're sending.
941 * Just ignore it... */
943 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
944 payload_nob, payload_niov, libcfs_id2str(target));
946 LASSERT (payload_nob == 0 || payload_niov > 0);
947 LASSERT (payload_niov <= LNET_MAX_IOV);
948 /* payload is either all vaddrs or all pages */
949 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
950 LASSERT (!in_interrupt ());
952 if (payload_iov != NULL)
953 desc_size = offsetof(ksock_tx_t,
954 tx_frags.virt.iov[1 + payload_niov]);
956 desc_size = offsetof(ksock_tx_t,
957 tx_frags.paged.kiov[payload_niov]);
959 if (lntmsg->msg_vmflush)
960 mpflag = cfs_memory_pressure_get_and_set();
961 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
963 CERROR("Can't allocate tx desc type %d size %d\n",
965 if (lntmsg->msg_vmflush)
966 cfs_memory_pressure_restore(mpflag);
970 tx->tx_conn = NULL; /* set when assigned a conn */
971 tx->tx_lnetmsg = lntmsg;
973 if (payload_iov != NULL) {
976 tx->tx_iov = tx->tx_frags.virt.iov;
978 lnet_extract_iov(payload_niov, &tx->tx_iov[1],
979 payload_niov, payload_iov,
980 payload_offset, payload_nob);
983 tx->tx_iov = &tx->tx_frags.paged.iov;
984 tx->tx_kiov = tx->tx_frags.paged.kiov;
985 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
986 payload_niov, payload_kiov,
987 payload_offset, payload_nob);
989 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
990 tx->tx_zc_capable = 1;
993 tx->tx_msg.ksm_csum = 0;
994 tx->tx_msg.ksm_type = KSOCK_MSG_LNET;
995 tx->tx_msg.ksm_zc_cookies[0] = 0;
996 tx->tx_msg.ksm_zc_cookies[1] = 0;
998 /* The first fragment will be set later in pro_pack */
999 rc = ksocknal_launch_packet(ni, tx, target);
1001 cfs_memory_pressure_restore(mpflag);
1006 ksocknal_free_tx(tx);
1011 ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
1013 struct task_struct *task = kthread_run(fn, arg, name);
1016 return PTR_ERR(task);
1018 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1019 ksocknal_data.ksnd_nthreads++;
1020 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1025 ksocknal_thread_fini (void)
1027 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1028 ksocknal_data.ksnd_nthreads--;
1029 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1033 ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
1035 static char ksocknal_slop_buffer[4096];
1041 LASSERT(conn->ksnc_proto != NULL);
1043 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1044 /* Remind the socket to ack eagerly... */
1045 ksocknal_lib_eager_ack(conn);
1048 if (nob_to_skip == 0) { /* right at next packet boundary now */
1049 conn->ksnc_rx_started = 0;
1050 smp_mb(); /* racing with timeout thread */
1052 switch (conn->ksnc_proto->pro_version) {
1053 case KSOCK_PROTO_V2:
1054 case KSOCK_PROTO_V3:
1055 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1056 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1057 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1059 conn->ksnc_rx_nob_wanted = offsetof(struct ksock_msg, ksm_u);
1060 conn->ksnc_rx_nob_left = offsetof(struct ksock_msg, ksm_u);
1061 conn->ksnc_rx_iov[0].iov_len = offsetof(struct ksock_msg, ksm_u);
1064 case KSOCK_PROTO_V1:
1065 /* Receiving bare lnet_hdr_t */
1066 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1067 conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
1068 conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
1070 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1071 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1072 conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t);
1078 conn->ksnc_rx_niov = 1;
1080 conn->ksnc_rx_kiov = NULL;
1081 conn->ksnc_rx_nkiov = 0;
1082 conn->ksnc_rx_csum = ~0;
1086 /* Set up to skip as much as possible now. If there's more left
1087 * (ran out of iov entries) we'll get called again */
1089 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1090 conn->ksnc_rx_nob_left = nob_to_skip;
1091 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1096 nob = MIN (nob_to_skip, sizeof (ksocknal_slop_buffer));
1098 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1099 conn->ksnc_rx_iov[niov].iov_len = nob;
1104 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1105 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof(struct kvec));
1107 conn->ksnc_rx_niov = niov;
1108 conn->ksnc_rx_kiov = NULL;
1109 conn->ksnc_rx_nkiov = 0;
1110 conn->ksnc_rx_nob_wanted = skipped;
1115 ksocknal_process_receive (ksock_conn_t *conn)
1118 lnet_process_id_t *id;
1121 LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
1123 /* NB: sched lock NOT held */
1124 /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
1125 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1126 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1127 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1128 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1130 if (conn->ksnc_rx_nob_wanted != 0) {
1131 rc = ksocknal_receive(conn);
1134 lnet_process_id_t ksnp_id = conn->ksnc_peer->ksnp_id;
1136 LASSERT(rc != -EAGAIN);
1139 CDEBUG(D_NET, "[%p] EOF from %s "
1140 "ip %pI4h:%d\n", conn,
1141 libcfs_id2str(ksnp_id),
1144 else if (!conn->ksnc_closing)
1145 CERROR("[%p] Error %d on read from %s "
1146 "ip %pI4h:%d\n", conn, rc,
1147 libcfs_id2str(ksnp_id),
1151 /* it's not an error if conn is being closed */
1152 ksocknal_close_conn_and_siblings (conn,
1153 (conn->ksnc_closing) ? 0 : rc);
1154 return (rc == 0 ? -ESHUTDOWN : rc);
1157 if (conn->ksnc_rx_nob_wanted != 0) {
1162 switch (conn->ksnc_rx_state) {
1163 case SOCKNAL_RX_KSM_HEADER:
1164 if (conn->ksnc_flip) {
1165 __swab32s(&conn->ksnc_msg.ksm_type);
1166 __swab32s(&conn->ksnc_msg.ksm_csum);
1167 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1168 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1171 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1172 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1173 CERROR("%s: Unknown message type: %x\n",
1174 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1175 conn->ksnc_msg.ksm_type);
1176 ksocknal_new_packet(conn, 0);
1177 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1181 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1182 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1183 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1184 /* NOOP Checksum error */
1185 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1186 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1187 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1188 ksocknal_new_packet(conn, 0);
1189 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1193 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1196 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1198 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1199 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1201 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1202 conn->ksnc_msg.ksm_zc_cookies[1]);
1205 CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
1206 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1207 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1208 ksocknal_new_packet(conn, 0);
1209 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1214 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1215 ksocknal_new_packet (conn, 0);
1216 return 0; /* NOOP is done and just return */
1219 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1220 conn->ksnc_rx_nob_wanted = sizeof(struct ksock_lnet_msg);
1221 conn->ksnc_rx_nob_left = sizeof(struct ksock_lnet_msg);
1223 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1224 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1225 conn->ksnc_rx_iov[0].iov_len = sizeof(struct ksock_lnet_msg);
1227 conn->ksnc_rx_niov = 1;
1228 conn->ksnc_rx_kiov = NULL;
1229 conn->ksnc_rx_nkiov = 0;
1231 goto again; /* read lnet header now */
1233 case SOCKNAL_RX_LNET_HEADER:
1234 /* unpack message header */
1235 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1237 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1238 /* Userspace peer */
1239 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1240 id = &conn->ksnc_peer->ksnp_id;
1242 /* Substitute process ID assigned at connection time */
1243 lhdr->src_pid = cpu_to_le32(id->pid);
1244 lhdr->src_nid = cpu_to_le64(id->nid);
1247 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1248 ksocknal_conn_addref(conn); /* ++ref while parsing */
1250 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1251 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1252 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1254 /* I just received garbage: give up on this conn */
1255 ksocknal_new_packet(conn, 0);
1256 ksocknal_close_conn_and_siblings (conn, rc);
1257 ksocknal_conn_decref(conn);
1261 /* I'm racing with ksocknal_recv() */
1262 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1263 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1265 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1268 /* ksocknal_recv() got called */
1271 case SOCKNAL_RX_LNET_PAYLOAD:
1272 /* payload all received */
1275 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1276 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1277 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1278 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1279 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1280 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1284 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1285 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1287 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1288 id = &conn->ksnc_peer->ksnp_id;
1290 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1291 conn->ksnc_msg.ksm_zc_cookies[0],
1292 *ksocknal_tunables.ksnd_nonblk_zcack ||
1293 le64_to_cpu(lhdr->src_nid) != id->nid);
1296 lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
1299 ksocknal_new_packet(conn, 0);
1300 ksocknal_close_conn_and_siblings (conn, rc);
1305 case SOCKNAL_RX_SLOP:
1306 /* starting new packet? */
1307 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1308 return 0; /* come back later */
1309 goto again; /* try to finish reading slop now */
1317 return (-EINVAL); /* keep gcc happy */
1321 ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
1322 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1323 unsigned int offset, unsigned int mlen, unsigned int rlen)
1325 ksock_conn_t *conn = (ksock_conn_t *)private;
1326 ksock_sched_t *sched = conn->ksnc_scheduler;
1328 LASSERT (mlen <= rlen);
1329 LASSERT (niov <= LNET_MAX_IOV);
1331 conn->ksnc_cookie = msg;
1332 conn->ksnc_rx_nob_wanted = mlen;
1333 conn->ksnc_rx_nob_left = rlen;
1335 if (mlen == 0 || iov != NULL) {
1336 conn->ksnc_rx_nkiov = 0;
1337 conn->ksnc_rx_kiov = NULL;
1338 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1339 conn->ksnc_rx_niov =
1340 lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
1341 niov, iov, offset, mlen);
1343 conn->ksnc_rx_niov = 0;
1344 conn->ksnc_rx_iov = NULL;
1345 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1346 conn->ksnc_rx_nkiov =
1347 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1348 niov, kiov, offset, mlen);
1352 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1353 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1355 LASSERT (conn->ksnc_rx_scheduled);
1357 spin_lock_bh(&sched->kss_lock);
1359 switch (conn->ksnc_rx_state) {
1360 case SOCKNAL_RX_PARSE_WAIT:
1361 list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1362 wake_up(&sched->kss_waitq);
1363 LASSERT(conn->ksnc_rx_ready);
1366 case SOCKNAL_RX_PARSE:
1367 /* scheduler hasn't noticed I'm parsing yet */
1371 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1373 spin_unlock_bh(&sched->kss_lock);
1374 ksocknal_conn_decref(conn);
1379 ksocknal_sched_cansleep(ksock_sched_t *sched)
1383 spin_lock_bh(&sched->kss_lock);
1385 rc = (!ksocknal_data.ksnd_shuttingdown &&
1386 list_empty(&sched->kss_rx_conns) &&
1387 list_empty(&sched->kss_tx_conns));
1389 spin_unlock_bh(&sched->kss_lock);
1393 int ksocknal_scheduler(void *arg)
1395 struct ksock_sched_info *info;
1396 ksock_sched_t *sched;
1401 long id = (long)arg;
1403 info = ksocknal_data.ksnd_sched_info[KSOCK_THREAD_CPT(id)];
1404 sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
1406 cfs_block_allsigs();
1408 rc = cfs_cpt_bind(lnet_cpt_table(), info->ksi_cpt);
1410 CWARN("Can't set CPU partition affinity to %d: %d\n",
1414 spin_lock_bh(&sched->kss_lock);
1416 while (!ksocknal_data.ksnd_shuttingdown) {
1417 int did_something = 0;
1419 /* Ensure I progress everything semi-fairly */
1421 if (!list_empty(&sched->kss_rx_conns)) {
1422 conn = list_entry(sched->kss_rx_conns.next,
1423 ksock_conn_t, ksnc_rx_list);
1424 list_del(&conn->ksnc_rx_list);
1426 LASSERT(conn->ksnc_rx_scheduled);
1427 LASSERT(conn->ksnc_rx_ready);
1429 /* clear rx_ready in case receive isn't complete.
1430 * Do it BEFORE we call process_recv, since
1431 * data_ready can set it any time after we release
1433 conn->ksnc_rx_ready = 0;
1434 spin_unlock_bh(&sched->kss_lock);
1436 rc = ksocknal_process_receive(conn);
1438 spin_lock_bh(&sched->kss_lock);
1440 /* I'm the only one that can clear this flag */
1441 LASSERT(conn->ksnc_rx_scheduled);
1443 /* Did process_receive get everything it wanted? */
1445 conn->ksnc_rx_ready = 1;
1447 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1448 /* Conn blocked waiting for ksocknal_recv()
1449 * I change its state (under lock) to signal
1450 * it can be rescheduled */
1451 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1452 } else if (conn->ksnc_rx_ready) {
1453 /* reschedule for rx */
1454 list_add_tail(&conn->ksnc_rx_list,
1455 &sched->kss_rx_conns);
1457 conn->ksnc_rx_scheduled = 0;
1459 ksocknal_conn_decref(conn);
1465 if (!list_empty(&sched->kss_tx_conns)) {
1466 struct list_head zlist = LIST_HEAD_INIT(zlist);
1468 if (!list_empty(&sched->kss_zombie_noop_txs)) {
1470 &sched->kss_zombie_noop_txs);
1471 list_del_init(&sched->kss_zombie_noop_txs);
1474 conn = list_entry(sched->kss_tx_conns.next,
1475 ksock_conn_t, ksnc_tx_list);
1476 list_del(&conn->ksnc_tx_list);
1478 LASSERT(conn->ksnc_tx_scheduled);
1479 LASSERT(conn->ksnc_tx_ready);
1480 LASSERT(!list_empty(&conn->ksnc_tx_queue));
1482 tx = list_entry(conn->ksnc_tx_queue.next,
1483 ksock_tx_t, tx_list);
1485 if (conn->ksnc_tx_carrier == tx)
1486 ksocknal_next_tx_carrier(conn);
1488 /* dequeue now so empty list => more to send */
1489 list_del(&tx->tx_list);
1491 /* Clear tx_ready in case send isn't complete. Do
1492 * it BEFORE we call process_transmit, since
1493 * write_space can set it any time after we release
1495 conn->ksnc_tx_ready = 0;
1496 spin_unlock_bh(&sched->kss_lock);
1498 if (!list_empty(&zlist)) {
1499 /* free zombie noop txs, it's fast because
1500 * noop txs are just put in freelist */
1501 ksocknal_txlist_done(NULL, &zlist, 0);
1504 rc = ksocknal_process_transmit(conn, tx);
1506 if (rc == -ENOMEM || rc == -EAGAIN) {
1507 /* Incomplete send: replace tx on HEAD of tx_queue */
1508 spin_lock_bh(&sched->kss_lock);
1509 list_add(&tx->tx_list,
1510 &conn->ksnc_tx_queue);
1512 /* Complete send; tx -ref */
1513 ksocknal_tx_decref(tx);
1515 spin_lock_bh(&sched->kss_lock);
1516 /* assume space for more */
1517 conn->ksnc_tx_ready = 1;
1520 if (rc == -ENOMEM) {
1521 /* Do nothing; after a short timeout, this
1522 * conn will be reposted on kss_tx_conns. */
1523 } else if (conn->ksnc_tx_ready &&
1524 !list_empty(&conn->ksnc_tx_queue)) {
1525 /* reschedule for tx */
1526 list_add_tail(&conn->ksnc_tx_list,
1527 &sched->kss_tx_conns);
1529 conn->ksnc_tx_scheduled = 0;
1531 ksocknal_conn_decref(conn);
1536 if (!did_something || /* nothing to do */
1537 ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
1538 spin_unlock_bh(&sched->kss_lock);
1542 if (!did_something) { /* wait for something to do */
1543 rc = wait_event_interruptible_exclusive(
1545 !ksocknal_sched_cansleep(sched));
1551 spin_lock_bh(&sched->kss_lock);
1555 spin_unlock_bh(&sched->kss_lock);
1556 ksocknal_thread_fini();
1561 * Add connection to kss_rx_conns of scheduler
1562 * and wakeup the scheduler.
1564 void ksocknal_read_callback (ksock_conn_t *conn)
1566 ksock_sched_t *sched;
1569 sched = conn->ksnc_scheduler;
1571 spin_lock_bh(&sched->kss_lock);
1573 conn->ksnc_rx_ready = 1;
1575 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1576 list_add_tail(&conn->ksnc_rx_list,
1577 &sched->kss_rx_conns);
1578 conn->ksnc_rx_scheduled = 1;
1579 /* extra ref for scheduler */
1580 ksocknal_conn_addref(conn);
1582 wake_up (&sched->kss_waitq);
1584 spin_unlock_bh(&sched->kss_lock);
1590 * Add connection to kss_tx_conns of scheduler
1591 * and wakeup the scheduler.
1593 void ksocknal_write_callback(ksock_conn_t *conn)
1595 ksock_sched_t *sched;
1598 sched = conn->ksnc_scheduler;
1600 spin_lock_bh(&sched->kss_lock);
1602 conn->ksnc_tx_ready = 1;
1604 if (!conn->ksnc_tx_scheduled && /* not being progressed */
1605 !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
1606 list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
1607 conn->ksnc_tx_scheduled = 1;
1608 /* extra ref for scheduler */
1609 ksocknal_conn_addref(conn);
1611 wake_up(&sched->kss_waitq);
1614 spin_unlock_bh(&sched->kss_lock);
1619 static ksock_proto_t *
1620 ksocknal_parse_proto_version (struct ksock_hello_msg *hello)
1624 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1625 version = hello->kshm_version;
1626 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1627 version = __swab32(hello->kshm_version);
1630 #if SOCKNAL_VERSION_DEBUG
1631 if (*ksocknal_tunables.ksnd_protocol == 1)
1634 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1635 version == KSOCK_PROTO_V3)
1638 if (version == KSOCK_PROTO_V2)
1639 return &ksocknal_protocol_v2x;
1641 if (version == KSOCK_PROTO_V3)
1642 return &ksocknal_protocol_v3x;
1647 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1648 lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
1650 CLASSERT (sizeof (lnet_magicversion_t) ==
1651 offsetof (struct ksock_hello_msg, kshm_src_nid));
1653 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1654 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1655 return &ksocknal_protocol_v1x;
1662 ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1663 lnet_nid_t peer_nid, struct ksock_hello_msg *hello)
1665 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1666 ksock_net_t *net = (ksock_net_t *)ni->ni_data;
1668 LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
1670 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1671 LASSERT (conn->ksnc_proto != NULL);
1673 hello->kshm_src_nid = ni->ni_nid;
1674 hello->kshm_dst_nid = peer_nid;
1675 hello->kshm_src_pid = the_lnet.ln_pid;
1677 hello->kshm_src_incarnation = net->ksnn_incarnation;
1678 hello->kshm_ctype = conn->ksnc_type;
1680 return conn->ksnc_proto->pro_send_hello(conn, hello);
1684 ksocknal_invert_type(int type)
1688 case SOCKLND_CONN_ANY:
1689 case SOCKLND_CONN_CONTROL:
1691 case SOCKLND_CONN_BULK_IN:
1692 return SOCKLND_CONN_BULK_OUT;
1693 case SOCKLND_CONN_BULK_OUT:
1694 return SOCKLND_CONN_BULK_IN;
1696 return (SOCKLND_CONN_NONE);
1701 ksocknal_recv_hello(lnet_ni_t *ni, ksock_conn_t *conn,
1702 struct ksock_hello_msg *hello, lnet_process_id_t *peerid,
1705 /* Return < 0 fatal error
1707 * EALREADY lost connection race
1708 * EPROTO protocol version mismatch
1710 struct socket *sock = conn->ksnc_sock;
1711 int active = (conn->ksnc_proto != NULL);
1715 ksock_proto_t *proto;
1716 lnet_process_id_t recv_id;
1718 /* socket type set on active connections - not set on passive */
1719 LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1721 timeout = active ? *ksocknal_tunables.ksnd_timeout :
1722 lnet_acceptor_timeout();
1724 rc = lnet_sock_read(sock, &hello->kshm_magic,
1725 sizeof(hello->kshm_magic), timeout);
1727 CERROR("Error %d reading HELLO from %pI4h\n",
1728 rc, &conn->ksnc_ipaddr);
1733 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1734 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1735 hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1736 /* Unexpected magic! */
1737 CERROR ("Bad magic(1) %#08x (%#08x expected) from "
1738 "%pI4h\n", __cpu_to_le32 (hello->kshm_magic),
1739 LNET_PROTO_TCP_MAGIC, &conn->ksnc_ipaddr);
1743 rc = lnet_sock_read(sock, &hello->kshm_version,
1744 sizeof(hello->kshm_version), timeout);
1746 CERROR("Error %d reading HELLO from %pI4h\n",
1747 rc, &conn->ksnc_ipaddr);
1752 proto = ksocknal_parse_proto_version(hello);
1753 if (proto == NULL) {
1755 /* unknown protocol from peer, tell peer my protocol */
1756 conn->ksnc_proto = &ksocknal_protocol_v3x;
1757 #if SOCKNAL_VERSION_DEBUG
1758 if (*ksocknal_tunables.ksnd_protocol == 2)
1759 conn->ksnc_proto = &ksocknal_protocol_v2x;
1760 else if (*ksocknal_tunables.ksnd_protocol == 1)
1761 conn->ksnc_proto = &ksocknal_protocol_v1x;
1763 hello->kshm_nips = 0;
1764 ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1767 CERROR("Unknown protocol version (%d.x expected) from %pI4h\n",
1768 conn->ksnc_proto->pro_version, &conn->ksnc_ipaddr);
1773 proto_match = (conn->ksnc_proto == proto);
1774 conn->ksnc_proto = proto;
1776 /* receive the rest of hello message anyway */
1777 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1779 CERROR("Error %d reading or checking hello from from %pI4h\n",
1780 rc, &conn->ksnc_ipaddr);
1785 *incarnation = hello->kshm_src_incarnation;
1787 if (hello->kshm_src_nid == LNET_NID_ANY) {
1788 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY"
1789 "from %pI4h\n", &conn->ksnc_ipaddr);
1794 conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1795 /* Userspace NAL assigns peer process ID from socket */
1796 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1797 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1799 recv_id.nid = hello->kshm_src_nid;
1800 recv_id.pid = hello->kshm_src_pid;
1806 /* peer determines type */
1807 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1808 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1809 CERROR("Unexpected type %d from %s ip %pI4h\n",
1810 hello->kshm_ctype, libcfs_id2str(*peerid),
1811 &conn->ksnc_ipaddr);
1817 if (peerid->pid != recv_id.pid ||
1818 peerid->nid != recv_id.nid) {
1819 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1820 " %pI4h, but they claimed they were "
1821 "%s; please check your Lustre "
1823 libcfs_id2str(*peerid),
1825 libcfs_id2str(recv_id));
1829 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1830 /* Possible protocol mismatch or I lost the connection race */
1831 return proto_match ? EALREADY : EPROTO;
1834 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1835 CERROR("Mismatched types: me %d, %s ip %pI4h %d\n",
1836 conn->ksnc_type, libcfs_id2str(*peerid),
1845 ksocknal_connect (ksock_route_t *route)
1847 struct list_head zombies = LIST_HEAD_INIT(zombies);
1848 ksock_peer_t *peer = route->ksnr_peer;
1851 struct socket *sock;
1852 cfs_time_t deadline;
1853 int retry_later = 0;
1856 deadline = cfs_time_add(cfs_time_current(),
1857 cfs_time_seconds(*ksocknal_tunables.ksnd_timeout));
1859 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1861 LASSERT (route->ksnr_scheduled);
1862 LASSERT (!route->ksnr_connecting);
1864 route->ksnr_connecting = 1;
1867 wanted = ksocknal_route_mask() & ~route->ksnr_connected;
1869 /* stop connecting if peer/route got closed under me, or
1870 * route got connected while queued */
1871 if (peer->ksnp_closing || route->ksnr_deleted ||
1877 /* reschedule if peer is connecting to me */
1878 if (peer->ksnp_accepting > 0) {
1880 "peer %s(%d) already connecting to me, retry later.\n",
1881 libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting);
1885 if (retry_later) /* needs reschedule */
1888 if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) {
1889 type = SOCKLND_CONN_ANY;
1890 } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) {
1891 type = SOCKLND_CONN_CONTROL;
1892 } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) {
1893 type = SOCKLND_CONN_BULK_IN;
1895 LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0);
1896 type = SOCKLND_CONN_BULK_OUT;
1899 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1901 if (cfs_time_aftereq(cfs_time_current(), deadline)) {
1903 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1909 rc = lnet_connect(&sock, peer->ksnp_id.nid,
1910 route->ksnr_myipaddr,
1911 route->ksnr_ipaddr, route->ksnr_port);
1915 rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type);
1917 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1923 /* A +ve RC means I have to retry because I lost the connection
1924 * race or I have to renegotiate protocol version */
1925 retry_later = (rc != 0);
1927 CDEBUG(D_NET, "peer %s: conn race, retry later.\n",
1928 libcfs_nid2str(peer->ksnp_id.nid));
1930 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1933 route->ksnr_scheduled = 0;
1934 route->ksnr_connecting = 0;
1937 /* re-queue for attention; this frees me up to handle
1938 * the peer's incoming connection request */
1940 if (rc == EALREADY ||
1941 (rc == 0 && peer->ksnp_accepting > 0)) {
1942 /* We want to introduce a delay before next
1943 * attempt to connect if we lost conn race,
1944 * but the race is resolved quickly usually,
1945 * so min_reconnectms should be good heuristic */
1946 route->ksnr_retry_interval =
1947 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000;
1948 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1949 route->ksnr_retry_interval);
1952 ksocknal_launch_connection_locked(route);
1955 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1959 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1961 route->ksnr_scheduled = 0;
1962 route->ksnr_connecting = 0;
1964 /* This is a retry rather than a new connection */
1965 route->ksnr_retry_interval *= 2;
1966 route->ksnr_retry_interval =
1967 MAX(route->ksnr_retry_interval,
1968 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000);
1969 route->ksnr_retry_interval =
1970 MIN(route->ksnr_retry_interval,
1971 cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000);
1973 LASSERT (route->ksnr_retry_interval != 0);
1974 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1975 route->ksnr_retry_interval);
1977 if (!list_empty(&peer->ksnp_tx_queue) &&
1978 peer->ksnp_accepting == 0 &&
1979 ksocknal_find_connecting_route_locked(peer) == NULL) {
1982 /* ksnp_tx_queue is queued on a conn on successful
1983 * connection for V1.x and V2.x */
1984 if (!list_empty(&peer->ksnp_conns)) {
1985 conn = list_entry(peer->ksnp_conns.next,
1986 ksock_conn_t, ksnc_list);
1987 LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
1990 /* take all the blocked packets while I've got the lock and
1991 * complete below... */
1992 list_splice_init(&peer->ksnp_tx_queue, &zombies);
1995 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1997 ksocknal_peer_failed(peer);
1998 ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
2003 * check whether we need to create more connds.
2004 * It will try to create new thread if it's necessary, @timeout can
2005 * be updated if failed to create, so caller wouldn't keep try while
2006 * running out of resource.
2009 ksocknal_connd_check_start(time64_t sec, long *timeout)
2013 int total = ksocknal_data.ksnd_connd_starting +
2014 ksocknal_data.ksnd_connd_running;
2016 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2017 /* still in initializing */
2021 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2022 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2023 /* can't create more connd, or still have enough
2024 * threads to handle more connecting */
2028 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2029 /* no pending connecting request */
2033 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2034 /* may run out of resource, retry later */
2035 *timeout = cfs_time_seconds(1);
2039 if (ksocknal_data.ksnd_connd_starting > 0) {
2040 /* serialize starting to avoid flood */
2044 ksocknal_data.ksnd_connd_starting_stamp = sec;
2045 ksocknal_data.ksnd_connd_starting++;
2046 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2048 /* NB: total is the next id */
2049 snprintf(name, sizeof(name), "socknal_cd%02d", total);
2050 rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
2052 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2057 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2058 ksocknal_data.ksnd_connd_starting--;
2059 ksocknal_data.ksnd_connd_failed_stamp = ktime_get_real_seconds();
2065 * check whether current thread can exit, it will return 1 if there are too
2066 * many threads and no creating in past 120 seconds.
2067 * Also, this function may update @timeout to make caller come back
2068 * again to recheck these conditions.
2071 ksocknal_connd_check_stop(time64_t sec, long *timeout)
2075 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2076 /* still in initializing */
2080 if (ksocknal_data.ksnd_connd_starting > 0) {
2081 /* in progress of starting new thread */
2085 if (ksocknal_data.ksnd_connd_running <=
2086 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2090 /* created thread in past 120 seconds? */
2091 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2092 SOCKNAL_CONND_TIMEOUT - sec);
2094 *timeout = (val > 0) ? cfs_time_seconds(val) :
2095 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2099 /* no creating in past 120 seconds */
2101 return ksocknal_data.ksnd_connd_running >
2102 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2105 /* Go through connd_routes queue looking for a route that we can process
2106 * right now, @timeout_p can be updated if we need to come back later */
2107 static ksock_route_t *
2108 ksocknal_connd_get_route_locked(signed long *timeout_p)
2110 ksock_route_t *route;
2113 now = cfs_time_current();
2115 /* connd_routes can contain both pending and ordinary routes */
2116 list_for_each_entry(route, &ksocknal_data.ksnd_connd_routes,
2119 if (route->ksnr_retry_interval == 0 ||
2120 cfs_time_aftereq(now, route->ksnr_timeout))
2123 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2124 (int)*timeout_p > (int)(route->ksnr_timeout - now))
2125 *timeout_p = (int)(route->ksnr_timeout - now);
2132 ksocknal_connd (void *arg)
2134 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2135 ksock_connreq_t *cr;
2140 cfs_block_allsigs();
2142 init_waitqueue_entry(&wait, current);
2144 spin_lock_bh(connd_lock);
2146 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2147 ksocknal_data.ksnd_connd_starting--;
2148 ksocknal_data.ksnd_connd_running++;
2150 while (!ksocknal_data.ksnd_shuttingdown) {
2151 ksock_route_t *route = NULL;
2152 time64_t sec = ktime_get_real_seconds();
2153 long timeout = MAX_SCHEDULE_TIMEOUT;
2154 int dropped_lock = 0;
2156 if (ksocknal_connd_check_stop(sec, &timeout)) {
2157 /* wakeup another one to check stop */
2158 wake_up(&ksocknal_data.ksnd_connd_waitq);
2162 if (ksocknal_connd_check_start(sec, &timeout)) {
2163 /* created new thread */
2167 if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2168 /* Connection accepted by the listener */
2169 cr = list_entry(ksocknal_data.ksnd_connd_connreqs. \
2170 next, ksock_connreq_t, ksncr_list);
2172 list_del(&cr->ksncr_list);
2173 spin_unlock_bh(connd_lock);
2176 ksocknal_create_conn(cr->ksncr_ni, NULL,
2177 cr->ksncr_sock, SOCKLND_CONN_NONE);
2178 lnet_ni_decref(cr->ksncr_ni);
2179 LIBCFS_FREE(cr, sizeof(*cr));
2181 spin_lock_bh(connd_lock);
2184 /* Only handle an outgoing connection request if there
2185 * is a thread left to handle incoming connections and
2186 * create new connd */
2187 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2188 ksocknal_data.ksnd_connd_running) {
2189 route = ksocknal_connd_get_route_locked(&timeout);
2191 if (route != NULL) {
2192 list_del(&route->ksnr_connd_list);
2193 ksocknal_data.ksnd_connd_connecting++;
2194 spin_unlock_bh(connd_lock);
2197 if (ksocknal_connect(route)) {
2198 /* consecutive retry */
2199 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2200 CWARN("massive consecutive "
2201 "re-connecting to %pI4h\n",
2202 &route->ksnr_ipaddr);
2209 ksocknal_route_decref(route);
2211 spin_lock_bh(connd_lock);
2212 ksocknal_data.ksnd_connd_connecting--;
2216 if (++nloops < SOCKNAL_RESCHED)
2218 spin_unlock_bh(connd_lock);
2221 spin_lock_bh(connd_lock);
2225 /* Nothing to do for 'timeout' */
2226 set_current_state(TASK_INTERRUPTIBLE);
2227 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
2228 spin_unlock_bh(connd_lock);
2231 schedule_timeout(timeout);
2233 set_current_state(TASK_RUNNING);
2234 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2235 spin_lock_bh(connd_lock);
2237 ksocknal_data.ksnd_connd_running--;
2238 spin_unlock_bh(connd_lock);
2240 ksocknal_thread_fini();
2244 static ksock_conn_t *
2245 ksocknal_find_timed_out_conn (ksock_peer_t *peer)
2247 /* We're called with a shared lock on ksnd_global_lock */
2249 struct list_head *ctmp;
2251 list_for_each(ctmp, &peer->ksnp_conns) {
2253 conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
2255 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2256 LASSERT (!conn->ksnc_closing);
2258 error = conn->ksnc_sock->sk->sk_err;
2260 ksocknal_conn_addref(conn);
2264 CNETERR("A connection with %s "
2265 "(%pI4h:%d) was reset; "
2266 "it may have rebooted.\n",
2267 libcfs_id2str(peer->ksnp_id),
2272 CNETERR("A connection with %s "
2273 "(%pI4h:%d) timed out; the "
2274 "network or node may be down.\n",
2275 libcfs_id2str(peer->ksnp_id),
2280 CNETERR("An unexpected network error %d "
2282 "(%pI4h:%d\n", error,
2283 libcfs_id2str(peer->ksnp_id),
2292 if (conn->ksnc_rx_started &&
2293 cfs_time_aftereq(cfs_time_current(),
2294 conn->ksnc_rx_deadline)) {
2295 /* Timed out incomplete incoming message */
2296 ksocknal_conn_addref(conn);
2297 CNETERR("Timeout receiving from %s (%pI4h:%d), "
2298 "state %d wanted %d left %d\n",
2299 libcfs_id2str(peer->ksnp_id),
2302 conn->ksnc_rx_state,
2303 conn->ksnc_rx_nob_wanted,
2304 conn->ksnc_rx_nob_left);
2308 if ((!list_empty(&conn->ksnc_tx_queue) ||
2309 conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
2310 cfs_time_aftereq(cfs_time_current(),
2311 conn->ksnc_tx_deadline)) {
2312 /* Timed out messages queued for sending or
2313 * buffered in the socket's send buffer */
2314 ksocknal_conn_addref(conn);
2315 CNETERR("Timeout sending data to %s (%pI4h:%d) "
2316 "the network or that node may be down.\n",
2317 libcfs_id2str(peer->ksnp_id),
2318 &conn->ksnc_ipaddr, conn->ksnc_port);
2327 ksocknal_flush_stale_txs(ksock_peer_t *peer)
2330 struct list_head stale_txs = LIST_HEAD_INIT(stale_txs);
2332 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2334 while (!list_empty(&peer->ksnp_tx_queue)) {
2335 tx = list_entry(peer->ksnp_tx_queue.next,
2336 ksock_tx_t, tx_list);
2338 if (!cfs_time_aftereq(cfs_time_current(),
2342 list_del(&tx->tx_list);
2343 list_add_tail(&tx->tx_list, &stale_txs);
2346 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2348 ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
2352 ksocknal_send_keepalive_locked(ksock_peer_t *peer)
2353 __must_hold(&ksocknal_data.ksnd_global_lock)
2355 ksock_sched_t *sched;
2359 /* last_alive will be updated by create_conn */
2360 if (list_empty(&peer->ksnp_conns))
2363 if (peer->ksnp_proto != &ksocknal_protocol_v3x)
2366 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2367 cfs_time_before(cfs_time_current(),
2368 cfs_time_add(peer->ksnp_last_alive,
2369 cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
2372 if (cfs_time_before(cfs_time_current(),
2373 peer->ksnp_send_keepalive))
2376 /* retry 10 secs later, so we wouldn't put pressure
2377 * on this peer if we failed to send keepalive this time */
2378 peer->ksnp_send_keepalive = cfs_time_shift(10);
2380 conn = ksocknal_find_conn_locked(peer, NULL, 1);
2382 sched = conn->ksnc_scheduler;
2384 spin_lock_bh(&sched->kss_lock);
2385 if (!list_empty(&conn->ksnc_tx_queue)) {
2386 spin_unlock_bh(&sched->kss_lock);
2387 /* there is an queued ACK, don't need keepalive */
2391 spin_unlock_bh(&sched->kss_lock);
2394 read_unlock(&ksocknal_data.ksnd_global_lock);
2396 /* cookie = 1 is reserved for keepalive PING */
2397 tx = ksocknal_alloc_tx_noop(1, 1);
2399 read_lock(&ksocknal_data.ksnd_global_lock);
2403 if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) {
2404 read_lock(&ksocknal_data.ksnd_global_lock);
2408 ksocknal_free_tx(tx);
2409 read_lock(&ksocknal_data.ksnd_global_lock);
2416 ksocknal_check_peer_timeouts (int idx)
2418 struct list_head *peers = &ksocknal_data.ksnd_peers[idx];
2424 /* NB. We expect to have a look at all the peers and not find any
2425 * connections to time out, so we just use a shared lock while we
2427 read_lock(&ksocknal_data.ksnd_global_lock);
2429 list_for_each_entry(peer, peers, ksnp_list) {
2430 ksock_tx_t *tx_stale;
2431 cfs_time_t deadline = 0;
2435 if (ksocknal_send_keepalive_locked(peer) != 0) {
2436 read_unlock(&ksocknal_data.ksnd_global_lock);
2440 conn = ksocknal_find_timed_out_conn (peer);
2443 read_unlock(&ksocknal_data.ksnd_global_lock);
2445 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2447 /* NB we won't find this one again, but we can't
2448 * just proceed with the next peer, since we dropped
2449 * ksnd_global_lock and it might be dead already! */
2450 ksocknal_conn_decref(conn);
2454 /* we can't process stale txs right here because we're
2455 * holding only shared lock */
2456 if (!list_empty(&peer->ksnp_tx_queue)) {
2458 list_entry(peer->ksnp_tx_queue.next,
2459 ksock_tx_t, tx_list);
2461 if (cfs_time_aftereq(cfs_time_current(),
2464 ksocknal_peer_addref(peer);
2465 read_unlock(&ksocknal_data.ksnd_global_lock);
2467 ksocknal_flush_stale_txs(peer);
2469 ksocknal_peer_decref(peer);
2474 if (list_empty(&peer->ksnp_zc_req_list))
2478 spin_lock(&peer->ksnp_lock);
2479 list_for_each_entry(tx, &peer->ksnp_zc_req_list, tx_zc_list) {
2480 if (!cfs_time_aftereq(cfs_time_current(),
2483 /* ignore the TX if connection is being closed */
2484 if (tx->tx_conn->ksnc_closing)
2487 if (tx_stale == NULL)
2491 if (tx_stale == NULL) {
2492 spin_unlock(&peer->ksnp_lock);
2496 deadline = tx_stale->tx_deadline;
2497 resid = tx_stale->tx_resid;
2498 conn = tx_stale->tx_conn;
2499 ksocknal_conn_addref(conn);
2501 spin_unlock(&peer->ksnp_lock);
2502 read_unlock(&ksocknal_data.ksnd_global_lock);
2504 CERROR("Total %d stale ZC_REQs for peer %s detected; the "
2505 "oldest(%p) timed out %ld secs ago, "
2506 "resid: %d, wmem: %d\n",
2507 n, libcfs_nid2str(peer->ksnp_id.nid), tx_stale,
2508 cfs_duration_sec(cfs_time_current() - deadline),
2509 resid, conn->ksnc_sock->sk->sk_wmem_queued);
2511 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2512 ksocknal_conn_decref(conn);
2516 read_unlock(&ksocknal_data.ksnd_global_lock);
2519 int ksocknal_reaper(void *arg)
2523 ksock_sched_t *sched;
2524 struct list_head enomem_conns;
2526 cfs_duration_t timeout;
2529 cfs_time_t deadline = cfs_time_current();
2531 cfs_block_allsigs ();
2533 INIT_LIST_HEAD(&enomem_conns);
2534 init_waitqueue_entry(&wait, current);
2536 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2538 while (!ksocknal_data.ksnd_shuttingdown) {
2540 if (!list_empty(&ksocknal_data.ksnd_deathrow_conns)) {
2541 conn = list_entry(ksocknal_data. \
2542 ksnd_deathrow_conns.next,
2543 ksock_conn_t, ksnc_list);
2544 list_del(&conn->ksnc_list);
2546 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2548 ksocknal_terminate_conn(conn);
2549 ksocknal_conn_decref(conn);
2551 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2555 if (!list_empty(&ksocknal_data.ksnd_zombie_conns)) {
2556 conn = list_entry(ksocknal_data.ksnd_zombie_conns.\
2557 next, ksock_conn_t, ksnc_list);
2558 list_del(&conn->ksnc_list);
2560 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2562 ksocknal_destroy_conn(conn);
2564 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2568 if (!list_empty(&ksocknal_data.ksnd_enomem_conns)) {
2569 list_add(&enomem_conns,
2570 &ksocknal_data.ksnd_enomem_conns);
2571 list_del_init(&ksocknal_data.ksnd_enomem_conns);
2574 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2576 /* reschedule all the connections that stalled with ENOMEM... */
2578 while (!list_empty(&enomem_conns)) {
2579 conn = list_entry(enomem_conns.next,
2580 ksock_conn_t, ksnc_tx_list);
2581 list_del(&conn->ksnc_tx_list);
2583 sched = conn->ksnc_scheduler;
2585 spin_lock_bh(&sched->kss_lock);
2587 LASSERT(conn->ksnc_tx_scheduled);
2588 conn->ksnc_tx_ready = 1;
2589 list_add_tail(&conn->ksnc_tx_list,
2590 &sched->kss_tx_conns);
2591 wake_up(&sched->kss_waitq);
2593 spin_unlock_bh(&sched->kss_lock);
2597 /* careful with the jiffy wrap... */
2598 while ((timeout = cfs_time_sub(deadline,
2599 cfs_time_current())) <= 0) {
2602 int chunk = ksocknal_data.ksnd_peer_hash_size;
2604 /* Time to check for timeouts on a few more peers: I do
2605 * checks every 'p' seconds on a proportion of the peer
2606 * table and I need to check every connection 'n' times
2607 * within a timeout interval, to ensure I detect a
2608 * timeout on any connection within (n+1)/n times the
2609 * timeout interval. */
2611 if (*ksocknal_tunables.ksnd_timeout > n * p)
2612 chunk = (chunk * n * p) /
2613 *ksocknal_tunables.ksnd_timeout;
2617 for (i = 0; i < chunk; i++) {
2618 ksocknal_check_peer_timeouts (peer_index);
2619 peer_index = (peer_index + 1) %
2620 ksocknal_data.ksnd_peer_hash_size;
2623 deadline = cfs_time_add(deadline, cfs_time_seconds(p));
2626 if (nenomem_conns != 0) {
2627 /* Reduce my timeout if I rescheduled ENOMEM conns.
2628 * This also prevents me getting woken immediately
2629 * if any go back on my enomem list. */
2630 timeout = SOCKNAL_ENOMEM_RETRY;
2632 ksocknal_data.ksnd_reaper_waketime =
2633 cfs_time_add(cfs_time_current(), timeout);
2635 set_current_state(TASK_INTERRUPTIBLE);
2636 add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2638 if (!ksocknal_data.ksnd_shuttingdown &&
2639 list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
2640 list_empty(&ksocknal_data.ksnd_zombie_conns))
2641 schedule_timeout(timeout);
2643 set_current_state(TASK_RUNNING);
2644 remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2646 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2649 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2651 ksocknal_thread_fini();