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 socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_NOOP);
87 tx->tx_msg.ksm_zc_cookies[1] = cookie;
94 ksocknal_free_tx (ksock_tx_t *tx)
96 atomic_dec(&ksocknal_data.ksnd_nactive_txs);
98 if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
100 spin_lock(&ksocknal_data.ksnd_tx_lock);
102 list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
104 spin_unlock(&ksocknal_data.ksnd_tx_lock);
106 LIBCFS_FREE(tx, tx->tx_desc_size);
111 ksocknal_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
113 struct kvec *iov = tx->tx_iov;
117 LASSERT (tx->tx_niov > 0);
119 /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */
120 rc = ksocknal_lib_send_iov(conn, tx);
122 if (rc <= 0) /* sent nothing? */
126 LASSERT (nob <= tx->tx_resid);
131 LASSERT (tx->tx_niov > 0);
133 if (nob < (int) iov->iov_len) {
134 iov->iov_base += nob;
148 ksocknal_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
150 lnet_kiov_t *kiov = tx->tx_kiov;
154 LASSERT (tx->tx_niov == 0);
155 LASSERT (tx->tx_nkiov > 0);
157 /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
158 rc = ksocknal_lib_send_kiov(conn, tx);
160 if (rc <= 0) /* sent nothing? */
164 LASSERT (nob <= tx->tx_resid);
169 LASSERT(tx->tx_nkiov > 0);
171 if (nob < (int)kiov->kiov_len) {
172 kiov->kiov_offset += nob;
173 kiov->kiov_len -= nob;
177 nob -= (int)kiov->kiov_len;
178 tx->tx_kiov = ++kiov;
186 ksocknal_transmit(ksock_conn_t *conn, ksock_tx_t *tx)
191 if (ksocknal_data.ksnd_stall_tx != 0) {
192 set_current_state(TASK_UNINTERRUPTIBLE);
193 schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
196 LASSERT(tx->tx_resid != 0);
198 rc = ksocknal_connsock_addref(conn);
200 LASSERT (conn->ksnc_closing);
205 if (ksocknal_data.ksnd_enomem_tx > 0) {
207 ksocknal_data.ksnd_enomem_tx--;
209 } else if (tx->tx_niov != 0) {
210 rc = ksocknal_send_iov (conn, tx);
212 rc = ksocknal_send_kiov (conn, tx);
215 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
216 if (rc > 0) /* sent something? */
217 conn->ksnc_tx_bufnob += rc; /* account it */
219 if (bufnob < conn->ksnc_tx_bufnob) {
220 /* allocated send buffer bytes < computed; infer
221 * something got ACKed */
222 conn->ksnc_tx_deadline =
223 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
224 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
225 conn->ksnc_tx_bufnob = bufnob;
229 if (rc <= 0) { /* Didn't write anything? */
231 if (rc == 0) /* some stacks return 0 instead of -EAGAIN */
234 /* Check if EAGAIN is due to memory pressure */
235 if(rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
241 /* socket's wmem_queued now includes 'rc' bytes */
242 atomic_sub (rc, &conn->ksnc_tx_nob);
245 } while (tx->tx_resid != 0);
247 ksocknal_connsock_decref(conn);
252 ksocknal_recv_iov (ksock_conn_t *conn)
254 struct kvec *iov = conn->ksnc_rx_iov;
258 LASSERT (conn->ksnc_rx_niov > 0);
260 /* Never touch conn->ksnc_rx_iov or change connection
261 * status inside ksocknal_lib_recv_iov */
262 rc = ksocknal_lib_recv_iov(conn);
267 /* received something... */
270 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
271 conn->ksnc_rx_deadline =
272 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
273 smp_mb(); /* order with setting rx_started */
274 conn->ksnc_rx_started = 1;
276 conn->ksnc_rx_nob_wanted -= nob;
277 conn->ksnc_rx_nob_left -= nob;
280 LASSERT (conn->ksnc_rx_niov > 0);
282 if (nob < (int)iov->iov_len) {
284 iov->iov_base += nob;
289 conn->ksnc_rx_iov = ++iov;
290 conn->ksnc_rx_niov--;
297 ksocknal_recv_kiov (ksock_conn_t *conn)
299 lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
302 LASSERT (conn->ksnc_rx_nkiov > 0);
304 /* Never touch conn->ksnc_rx_kiov or change connection
305 * status inside ksocknal_lib_recv_iov */
306 rc = ksocknal_lib_recv_kiov(conn);
311 /* received something... */
314 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
315 conn->ksnc_rx_deadline =
316 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
317 smp_mb(); /* order with setting rx_started */
318 conn->ksnc_rx_started = 1;
320 conn->ksnc_rx_nob_wanted -= nob;
321 conn->ksnc_rx_nob_left -= nob;
324 LASSERT (conn->ksnc_rx_nkiov > 0);
326 if (nob < (int) kiov->kiov_len) {
327 kiov->kiov_offset += nob;
328 kiov->kiov_len -= nob;
332 nob -= kiov->kiov_len;
333 conn->ksnc_rx_kiov = ++kiov;
334 conn->ksnc_rx_nkiov--;
341 ksocknal_receive (ksock_conn_t *conn)
343 /* Return 1 on success, 0 on EOF, < 0 on error.
344 * Caller checks ksnc_rx_nob_wanted to determine
345 * progress/completion. */
349 if (ksocknal_data.ksnd_stall_rx != 0) {
350 set_current_state(TASK_UNINTERRUPTIBLE);
351 schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
354 rc = ksocknal_connsock_addref(conn);
356 LASSERT (conn->ksnc_closing);
361 if (conn->ksnc_rx_niov != 0)
362 rc = ksocknal_recv_iov (conn);
364 rc = ksocknal_recv_kiov (conn);
367 /* error/EOF or partial receive */
370 } else if (rc == 0 && conn->ksnc_rx_started) {
371 /* EOF in the middle of a message */
377 /* Completed a fragment */
379 if (conn->ksnc_rx_nob_wanted == 0) {
385 ksocknal_connsock_decref(conn);
390 ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
392 lnet_msg_t *lnetmsg = tx->tx_lnetmsg;
393 int rc = (tx->tx_resid == 0 && !tx->tx_zc_aborted) ? 0 : -EIO;
396 LASSERT(ni != NULL || tx->tx_conn != NULL);
398 if (tx->tx_conn != NULL)
399 ksocknal_conn_decref(tx->tx_conn);
401 if (ni == NULL && tx->tx_conn != NULL)
402 ni = tx->tx_conn->ksnc_peer->ksnp_ni;
404 ksocknal_free_tx (tx);
405 if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */
406 lnet_finalize (ni, lnetmsg, rc);
412 ksocknal_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int error)
416 while (!list_empty(txlist)) {
417 tx = list_entry(txlist->next, ksock_tx_t, tx_list);
419 if (error && tx->tx_lnetmsg != NULL) {
420 CNETERR("Deleting packet type %d len %d %s->%s\n",
421 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
422 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
423 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
424 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
426 CNETERR("Deleting noop packet\n");
429 list_del(&tx->tx_list);
431 LASSERT (atomic_read(&tx->tx_refcount) == 1);
432 ksocknal_tx_done (ni, tx);
437 ksocknal_check_zc_req(ksock_tx_t *tx)
439 ksock_conn_t *conn = tx->tx_conn;
440 ksock_peer_t *peer = conn->ksnc_peer;
442 /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
443 * to ksnp_zc_req_list if some fragment of this message should be sent
444 * zero-copy. Our peer will send an ACK containing this cookie when
445 * she has received this message to tell us we can signal completion.
446 * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
447 * ksnp_zc_req_list. */
448 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
449 LASSERT (tx->tx_zc_capable);
451 tx->tx_zc_checked = 1;
453 if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
454 !conn->ksnc_zc_capable)
457 /* assign cookie and queue tx to pending list, it will be released when
458 * a matching ack is received. See ksocknal_handle_zcack() */
460 ksocknal_tx_addref(tx);
462 spin_lock(&peer->ksnp_lock);
464 /* ZC_REQ is going to be pinned to the peer */
466 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
468 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
470 tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
472 if (peer->ksnp_zc_next_cookie == 0)
473 peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
475 list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
477 spin_unlock(&peer->ksnp_lock);
481 ksocknal_uncheck_zc_req(ksock_tx_t *tx)
483 ksock_peer_t *peer = tx->tx_conn->ksnc_peer;
485 LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
486 LASSERT(tx->tx_zc_capable);
488 tx->tx_zc_checked = 0;
490 spin_lock(&peer->ksnp_lock);
492 if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
493 /* Not waiting for an ACK */
494 spin_unlock(&peer->ksnp_lock);
498 tx->tx_msg.ksm_zc_cookies[0] = 0;
499 list_del(&tx->tx_zc_list);
501 spin_unlock(&peer->ksnp_lock);
503 ksocknal_tx_decref(tx);
507 ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
511 if (tx->tx_zc_capable && !tx->tx_zc_checked)
512 ksocknal_check_zc_req(tx);
514 rc = ksocknal_transmit (conn, tx);
516 CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc);
518 if (tx->tx_resid == 0) {
519 /* Sent everything OK */
531 counter++; /* exponential backoff warnings */
532 if ((counter & (-counter)) == counter)
533 CWARN("%u ENOMEM tx %p (%u allocated)\n",
534 counter, conn, atomic_read(&libcfs_kmemory));
536 /* Queue on ksnd_enomem_conns for retry after a timeout */
537 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
539 /* enomem list takes over scheduler's ref... */
540 LASSERT (conn->ksnc_tx_scheduled);
541 list_add_tail(&conn->ksnc_tx_list,
542 &ksocknal_data.ksnd_enomem_conns);
543 if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
544 SOCKNAL_ENOMEM_RETRY),
545 ksocknal_data.ksnd_reaper_waketime))
546 wake_up(&ksocknal_data.ksnd_reaper_waitq);
548 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
555 if (!conn->ksnc_closing) {
558 LCONSOLE_WARN("Host %pI4h reset our connection "
559 "while we were sending data; it may have "
564 LCONSOLE_WARN("There was an unexpected network error "
565 "while writing to %pI4h: %d.\n",
566 &conn->ksnc_ipaddr, rc);
569 CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pI4h:%d\n",
570 conn, rc, libcfs_id2str(conn->ksnc_peer->ksnp_id),
571 &conn->ksnc_ipaddr, conn->ksnc_port);
574 if (tx->tx_zc_checked)
575 ksocknal_uncheck_zc_req(tx);
577 /* it's not an error if conn is being closed */
578 ksocknal_close_conn_and_siblings (conn,
579 (conn->ksnc_closing) ? 0 : rc);
585 ksocknal_launch_connection_locked (ksock_route_t *route)
588 /* called holding write lock on ksnd_global_lock */
590 LASSERT (!route->ksnr_scheduled);
591 LASSERT (!route->ksnr_connecting);
592 LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
594 route->ksnr_scheduled = 1; /* scheduling conn for connd */
595 ksocknal_route_addref(route); /* extra ref for connd */
597 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
599 list_add_tail(&route->ksnr_connd_list,
600 &ksocknal_data.ksnd_connd_routes);
601 wake_up(&ksocknal_data.ksnd_connd_waitq);
603 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
607 ksocknal_launch_all_connections_locked (ksock_peer_t *peer)
609 ksock_route_t *route;
611 /* called holding write lock on ksnd_global_lock */
613 /* launch any/all connections that need it */
614 route = ksocknal_find_connectable_route_locked(peer);
618 ksocknal_launch_connection_locked(route);
623 ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk)
625 struct list_head *tmp;
627 ksock_conn_t *typed = NULL;
628 ksock_conn_t *fallback = NULL;
632 list_for_each(tmp, &peer->ksnp_conns) {
633 ksock_conn_t *c = list_entry(tmp, ksock_conn_t, ksnc_list);
634 int nob = atomic_read(&c->ksnc_tx_nob) +
635 c->ksnc_sock->sk->sk_wmem_queued;
638 LASSERT (!c->ksnc_closing);
639 LASSERT (c->ksnc_proto != NULL &&
640 c->ksnc_proto->pro_match_tx != NULL);
642 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
647 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
650 case SOCKNAL_MATCH_YES: /* typed connection */
651 if (typed == NULL || tnob > nob ||
652 (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
653 cfs_time_after(typed->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
659 case SOCKNAL_MATCH_MAY: /* fallback connection */
660 if (fallback == NULL || fnob > nob ||
661 (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
662 cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
670 /* prefer the typed selection */
671 conn = (typed != NULL) ? typed : fallback;
674 conn->ksnc_tx_last_post = cfs_time_current();
680 ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *tx)
682 conn->ksnc_proto->pro_pack(tx);
684 atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
685 ksocknal_conn_addref(conn); /* +1 ref for tx */
690 ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn)
692 ksock_sched_t *sched = conn->ksnc_scheduler;
693 ksock_msg_t *msg = &tx->tx_msg;
694 ksock_tx_t *ztx = NULL;
697 /* called holding global lock (read or irq-write) and caller may
698 * not have dropped this lock between finding conn and calling me,
699 * so we don't need the {get,put}connsock dance to deref
701 LASSERT(!conn->ksnc_closing);
703 CDEBUG(D_NET, "Sending to %s ip %pI4h:%d\n",
704 libcfs_id2str(conn->ksnc_peer->ksnp_id),
705 &conn->ksnc_ipaddr, conn->ksnc_port);
707 ksocknal_tx_prep(conn, tx);
709 /* Ensure the frags we've been given EXACTLY match the number of
710 * bytes we want to send. Many TCP/IP stacks disregard any total
711 * size parameters passed to them and just look at the frags.
713 * We always expect at least 1 mapped fragment containing the
714 * complete ksocknal message header. */
715 LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
716 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
717 (unsigned int)tx->tx_nob);
718 LASSERT (tx->tx_niov >= 1);
719 LASSERT (tx->tx_resid == tx->tx_nob);
721 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
722 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
724 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
726 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
727 spin_lock_bh(&sched->kss_lock);
729 if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
730 /* First packet starts the timeout */
731 conn->ksnc_tx_deadline =
732 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
733 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
734 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
735 conn->ksnc_tx_bufnob = 0;
736 smp_mb(); /* order with adding to tx_queue */
739 if (msg->ksm_type == KSOCK_MSG_NOOP) {
740 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
741 * on a normal packet so I don't need to send it */
742 LASSERT (msg->ksm_zc_cookies[1] != 0);
743 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
745 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
746 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
749 /* It's a normal packet - can it piggback a noop zc-ack that
750 * has been queued already? */
751 LASSERT (msg->ksm_zc_cookies[1] == 0);
752 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
754 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
755 /* ztx will be released later */
759 atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
760 list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
763 if (conn->ksnc_tx_ready && /* able to send */
764 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
765 /* +1 ref for scheduler */
766 ksocknal_conn_addref(conn);
767 list_add_tail(&conn->ksnc_tx_list,
768 &sched->kss_tx_conns);
769 conn->ksnc_tx_scheduled = 1;
770 wake_up(&sched->kss_waitq);
773 spin_unlock_bh(&sched->kss_lock);
778 ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
780 cfs_time_t now = cfs_time_current();
781 struct list_head *tmp;
782 ksock_route_t *route;
784 list_for_each(tmp, &peer->ksnp_routes) {
785 route = list_entry(tmp, ksock_route_t, ksnr_list);
787 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
789 if (route->ksnr_scheduled) /* connections being established */
792 /* all route types connected ? */
793 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
796 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
797 cfs_time_aftereq(now, route->ksnr_timeout))) {
799 "Too soon to retry route %pI4h "
800 "(cnted %d, interval %ld, %ld secs later)\n",
802 route->ksnr_connected,
803 route->ksnr_retry_interval,
804 cfs_duration_sec(route->ksnr_timeout - now));
815 ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
817 struct list_head *tmp;
818 ksock_route_t *route;
820 list_for_each(tmp, &peer->ksnp_routes) {
821 route = list_entry(tmp, ksock_route_t, ksnr_list);
823 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
825 if (route->ksnr_scheduled)
833 ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
841 LASSERT (tx->tx_conn == NULL);
843 g_lock = &ksocknal_data.ksnd_global_lock;
845 for (retry = 0;; retry = 1) {
847 peer = ksocknal_find_peer_locked(ni, id);
849 if (ksocknal_find_connectable_route_locked(peer) == NULL) {
850 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
852 /* I've got no routes that need to be
853 * connecting and I do have an actual
855 ksocknal_queue_tx_locked (tx, conn);
862 /* I'll need a write lock... */
865 write_lock_bh(g_lock);
867 peer = ksocknal_find_peer_locked(ni, id);
871 write_unlock_bh(g_lock);
873 if ((id.pid & LNET_PID_USERFLAG) != 0) {
874 CERROR("Refusing to create a connection to "
875 "userspace process %s\n", libcfs_id2str(id));
876 return -EHOSTUNREACH;
880 CERROR("Can't find peer %s\n", libcfs_id2str(id));
881 return -EHOSTUNREACH;
884 rc = ksocknal_add_peer(ni, id,
885 LNET_NIDADDR(id.nid),
886 lnet_acceptor_port());
888 CERROR("Can't add peer %s: %d\n",
889 libcfs_id2str(id), rc);
894 ksocknal_launch_all_connections_locked(peer);
896 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
898 /* Connection exists; queue message on it */
899 ksocknal_queue_tx_locked (tx, conn);
900 write_unlock_bh(g_lock);
904 if (peer->ksnp_accepting > 0 ||
905 ksocknal_find_connecting_route_locked (peer) != NULL) {
906 /* the message is going to be pinned to the peer */
908 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
910 /* Queue the message until a connection is established */
911 list_add_tail(&tx->tx_list, &peer->ksnp_tx_queue);
912 write_unlock_bh(g_lock);
916 write_unlock_bh(g_lock);
918 /* NB Routes may be ignored if connections to them failed recently */
919 CNETERR("No usable routes to %s\n", libcfs_id2str(id));
920 return (-EHOSTUNREACH);
924 ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
927 int type = lntmsg->msg_type;
928 lnet_process_id_t target = lntmsg->msg_target;
929 unsigned int payload_niov = lntmsg->msg_niov;
930 struct kvec *payload_iov = lntmsg->msg_iov;
931 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
932 unsigned int payload_offset = lntmsg->msg_offset;
933 unsigned int payload_nob = lntmsg->msg_len;
938 /* NB 'private' is different depending on what we're sending.
939 * Just ignore it... */
941 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
942 payload_nob, payload_niov, libcfs_id2str(target));
944 LASSERT (payload_nob == 0 || payload_niov > 0);
945 LASSERT (payload_niov <= LNET_MAX_IOV);
946 /* payload is either all vaddrs or all pages */
947 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
948 LASSERT (!in_interrupt ());
950 if (payload_iov != NULL)
951 desc_size = offsetof(ksock_tx_t,
952 tx_frags.virt.iov[1 + payload_niov]);
954 desc_size = offsetof(ksock_tx_t,
955 tx_frags.paged.kiov[payload_niov]);
957 if (lntmsg->msg_vmflush)
958 mpflag = cfs_memory_pressure_get_and_set();
959 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
961 CERROR("Can't allocate tx desc type %d size %d\n",
963 if (lntmsg->msg_vmflush)
964 cfs_memory_pressure_restore(mpflag);
968 tx->tx_conn = NULL; /* set when assigned a conn */
969 tx->tx_lnetmsg = lntmsg;
971 if (payload_iov != NULL) {
974 tx->tx_iov = tx->tx_frags.virt.iov;
976 lnet_extract_iov(payload_niov, &tx->tx_iov[1],
977 payload_niov, payload_iov,
978 payload_offset, payload_nob);
981 tx->tx_iov = &tx->tx_frags.paged.iov;
982 tx->tx_kiov = tx->tx_frags.paged.kiov;
983 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
984 payload_niov, payload_kiov,
985 payload_offset, payload_nob);
987 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
988 tx->tx_zc_capable = 1;
991 socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_LNET);
993 /* The first fragment will be set later in pro_pack */
994 rc = ksocknal_launch_packet(ni, tx, target);
996 cfs_memory_pressure_restore(mpflag);
1001 ksocknal_free_tx(tx);
1006 ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
1008 struct task_struct *task = kthread_run(fn, arg, name);
1011 return PTR_ERR(task);
1013 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1014 ksocknal_data.ksnd_nthreads++;
1015 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1020 ksocknal_thread_fini (void)
1022 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1023 ksocknal_data.ksnd_nthreads--;
1024 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1028 ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
1030 static char ksocknal_slop_buffer[4096];
1036 LASSERT(conn->ksnc_proto != NULL);
1038 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1039 /* Remind the socket to ack eagerly... */
1040 ksocknal_lib_eager_ack(conn);
1043 if (nob_to_skip == 0) { /* right at next packet boundary now */
1044 conn->ksnc_rx_started = 0;
1045 smp_mb(); /* racing with timeout thread */
1047 switch (conn->ksnc_proto->pro_version) {
1048 case KSOCK_PROTO_V2:
1049 case KSOCK_PROTO_V3:
1050 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1051 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1052 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1054 conn->ksnc_rx_nob_wanted = offsetof(ksock_msg_t, ksm_u);
1055 conn->ksnc_rx_nob_left = offsetof(ksock_msg_t, ksm_u);
1056 conn->ksnc_rx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u);
1059 case KSOCK_PROTO_V1:
1060 /* Receiving bare lnet_hdr_t */
1061 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1062 conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
1063 conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
1065 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1066 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1067 conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t);
1073 conn->ksnc_rx_niov = 1;
1075 conn->ksnc_rx_kiov = NULL;
1076 conn->ksnc_rx_nkiov = 0;
1077 conn->ksnc_rx_csum = ~0;
1081 /* Set up to skip as much as possible now. If there's more left
1082 * (ran out of iov entries) we'll get called again */
1084 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1085 conn->ksnc_rx_nob_left = nob_to_skip;
1086 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1091 nob = MIN (nob_to_skip, sizeof (ksocknal_slop_buffer));
1093 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1094 conn->ksnc_rx_iov[niov].iov_len = nob;
1099 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1100 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof(struct kvec));
1102 conn->ksnc_rx_niov = niov;
1103 conn->ksnc_rx_kiov = NULL;
1104 conn->ksnc_rx_nkiov = 0;
1105 conn->ksnc_rx_nob_wanted = skipped;
1110 ksocknal_process_receive (ksock_conn_t *conn)
1113 lnet_process_id_t *id;
1116 LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
1118 /* NB: sched lock NOT held */
1119 /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
1120 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1121 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1122 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1123 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1125 if (conn->ksnc_rx_nob_wanted != 0) {
1126 rc = ksocknal_receive(conn);
1129 lnet_process_id_t ksnp_id = conn->ksnc_peer->ksnp_id;
1131 LASSERT(rc != -EAGAIN);
1134 CDEBUG(D_NET, "[%p] EOF from %s "
1135 "ip %pI4h:%d\n", conn,
1136 libcfs_id2str(ksnp_id),
1139 else if (!conn->ksnc_closing)
1140 CERROR("[%p] Error %d on read from %s "
1141 "ip %pI4h:%d\n", conn, rc,
1142 libcfs_id2str(ksnp_id),
1146 /* it's not an error if conn is being closed */
1147 ksocknal_close_conn_and_siblings (conn,
1148 (conn->ksnc_closing) ? 0 : rc);
1149 return (rc == 0 ? -ESHUTDOWN : rc);
1152 if (conn->ksnc_rx_nob_wanted != 0) {
1157 switch (conn->ksnc_rx_state) {
1158 case SOCKNAL_RX_KSM_HEADER:
1159 if (conn->ksnc_flip) {
1160 __swab32s(&conn->ksnc_msg.ksm_type);
1161 __swab32s(&conn->ksnc_msg.ksm_csum);
1162 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1163 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1166 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1167 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1168 CERROR("%s: Unknown message type: %x\n",
1169 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1170 conn->ksnc_msg.ksm_type);
1171 ksocknal_new_packet(conn, 0);
1172 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1176 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1177 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1178 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1179 /* NOOP Checksum error */
1180 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1181 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1182 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1183 ksocknal_new_packet(conn, 0);
1184 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1188 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1191 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1193 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1194 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1196 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1197 conn->ksnc_msg.ksm_zc_cookies[1]);
1200 CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
1201 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1202 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1203 ksocknal_new_packet(conn, 0);
1204 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1209 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1210 ksocknal_new_packet (conn, 0);
1211 return 0; /* NOOP is done and just return */
1214 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1215 conn->ksnc_rx_nob_wanted = sizeof(ksock_lnet_msg_t);
1216 conn->ksnc_rx_nob_left = sizeof(ksock_lnet_msg_t);
1218 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1219 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1220 conn->ksnc_rx_iov[0].iov_len = sizeof(ksock_lnet_msg_t);
1222 conn->ksnc_rx_niov = 1;
1223 conn->ksnc_rx_kiov = NULL;
1224 conn->ksnc_rx_nkiov = 0;
1226 goto again; /* read lnet header now */
1228 case SOCKNAL_RX_LNET_HEADER:
1229 /* unpack message header */
1230 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1232 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1233 /* Userspace peer */
1234 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1235 id = &conn->ksnc_peer->ksnp_id;
1237 /* Substitute process ID assigned at connection time */
1238 lhdr->src_pid = cpu_to_le32(id->pid);
1239 lhdr->src_nid = cpu_to_le64(id->nid);
1242 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1243 ksocknal_conn_addref(conn); /* ++ref while parsing */
1245 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1246 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1247 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1249 /* I just received garbage: give up on this conn */
1250 ksocknal_new_packet(conn, 0);
1251 ksocknal_close_conn_and_siblings (conn, rc);
1252 ksocknal_conn_decref(conn);
1256 /* I'm racing with ksocknal_recv() */
1257 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1258 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1260 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1263 /* ksocknal_recv() got called */
1266 case SOCKNAL_RX_LNET_PAYLOAD:
1267 /* payload all received */
1270 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1271 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1272 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1273 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1274 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1275 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1279 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1280 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1282 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1283 id = &conn->ksnc_peer->ksnp_id;
1285 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1286 conn->ksnc_msg.ksm_zc_cookies[0],
1287 *ksocknal_tunables.ksnd_nonblk_zcack ||
1288 le64_to_cpu(lhdr->src_nid) != id->nid);
1291 lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
1294 ksocknal_new_packet(conn, 0);
1295 ksocknal_close_conn_and_siblings (conn, rc);
1300 case SOCKNAL_RX_SLOP:
1301 /* starting new packet? */
1302 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1303 return 0; /* come back later */
1304 goto again; /* try to finish reading slop now */
1312 return (-EINVAL); /* keep gcc happy */
1316 ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
1317 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1318 unsigned int offset, unsigned int mlen, unsigned int rlen)
1320 ksock_conn_t *conn = (ksock_conn_t *)private;
1321 ksock_sched_t *sched = conn->ksnc_scheduler;
1323 LASSERT (mlen <= rlen);
1324 LASSERT (niov <= LNET_MAX_IOV);
1326 conn->ksnc_cookie = msg;
1327 conn->ksnc_rx_nob_wanted = mlen;
1328 conn->ksnc_rx_nob_left = rlen;
1330 if (mlen == 0 || iov != NULL) {
1331 conn->ksnc_rx_nkiov = 0;
1332 conn->ksnc_rx_kiov = NULL;
1333 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1334 conn->ksnc_rx_niov =
1335 lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
1336 niov, iov, offset, mlen);
1338 conn->ksnc_rx_niov = 0;
1339 conn->ksnc_rx_iov = NULL;
1340 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1341 conn->ksnc_rx_nkiov =
1342 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1343 niov, kiov, offset, mlen);
1347 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1348 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1350 LASSERT (conn->ksnc_rx_scheduled);
1352 spin_lock_bh(&sched->kss_lock);
1354 switch (conn->ksnc_rx_state) {
1355 case SOCKNAL_RX_PARSE_WAIT:
1356 list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1357 wake_up(&sched->kss_waitq);
1358 LASSERT(conn->ksnc_rx_ready);
1361 case SOCKNAL_RX_PARSE:
1362 /* scheduler hasn't noticed I'm parsing yet */
1366 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1368 spin_unlock_bh(&sched->kss_lock);
1369 ksocknal_conn_decref(conn);
1374 ksocknal_sched_cansleep(ksock_sched_t *sched)
1378 spin_lock_bh(&sched->kss_lock);
1380 rc = (!ksocknal_data.ksnd_shuttingdown &&
1381 list_empty(&sched->kss_rx_conns) &&
1382 list_empty(&sched->kss_tx_conns));
1384 spin_unlock_bh(&sched->kss_lock);
1388 int ksocknal_scheduler(void *arg)
1390 struct ksock_sched_info *info;
1391 ksock_sched_t *sched;
1396 long id = (long)arg;
1398 info = ksocknal_data.ksnd_sched_info[KSOCK_THREAD_CPT(id)];
1399 sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
1401 cfs_block_allsigs();
1403 rc = cfs_cpt_bind(lnet_cpt_table(), info->ksi_cpt);
1405 CWARN("Can't set CPU partition affinity to %d: %d\n",
1409 spin_lock_bh(&sched->kss_lock);
1411 while (!ksocknal_data.ksnd_shuttingdown) {
1412 int did_something = 0;
1414 /* Ensure I progress everything semi-fairly */
1416 if (!list_empty(&sched->kss_rx_conns)) {
1417 conn = list_entry(sched->kss_rx_conns.next,
1418 ksock_conn_t, ksnc_rx_list);
1419 list_del(&conn->ksnc_rx_list);
1421 LASSERT(conn->ksnc_rx_scheduled);
1422 LASSERT(conn->ksnc_rx_ready);
1424 /* clear rx_ready in case receive isn't complete.
1425 * Do it BEFORE we call process_recv, since
1426 * data_ready can set it any time after we release
1428 conn->ksnc_rx_ready = 0;
1429 spin_unlock_bh(&sched->kss_lock);
1431 rc = ksocknal_process_receive(conn);
1433 spin_lock_bh(&sched->kss_lock);
1435 /* I'm the only one that can clear this flag */
1436 LASSERT(conn->ksnc_rx_scheduled);
1438 /* Did process_receive get everything it wanted? */
1440 conn->ksnc_rx_ready = 1;
1442 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1443 /* Conn blocked waiting for ksocknal_recv()
1444 * I change its state (under lock) to signal
1445 * it can be rescheduled */
1446 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1447 } else if (conn->ksnc_rx_ready) {
1448 /* reschedule for rx */
1449 list_add_tail(&conn->ksnc_rx_list,
1450 &sched->kss_rx_conns);
1452 conn->ksnc_rx_scheduled = 0;
1454 ksocknal_conn_decref(conn);
1460 if (!list_empty(&sched->kss_tx_conns)) {
1461 struct list_head zlist = LIST_HEAD_INIT(zlist);
1463 if (!list_empty(&sched->kss_zombie_noop_txs)) {
1465 &sched->kss_zombie_noop_txs);
1466 list_del_init(&sched->kss_zombie_noop_txs);
1469 conn = list_entry(sched->kss_tx_conns.next,
1470 ksock_conn_t, ksnc_tx_list);
1471 list_del(&conn->ksnc_tx_list);
1473 LASSERT(conn->ksnc_tx_scheduled);
1474 LASSERT(conn->ksnc_tx_ready);
1475 LASSERT(!list_empty(&conn->ksnc_tx_queue));
1477 tx = list_entry(conn->ksnc_tx_queue.next,
1478 ksock_tx_t, tx_list);
1480 if (conn->ksnc_tx_carrier == tx)
1481 ksocknal_next_tx_carrier(conn);
1483 /* dequeue now so empty list => more to send */
1484 list_del(&tx->tx_list);
1486 /* Clear tx_ready in case send isn't complete. Do
1487 * it BEFORE we call process_transmit, since
1488 * write_space can set it any time after we release
1490 conn->ksnc_tx_ready = 0;
1491 spin_unlock_bh(&sched->kss_lock);
1493 if (!list_empty(&zlist)) {
1494 /* free zombie noop txs, it's fast because
1495 * noop txs are just put in freelist */
1496 ksocknal_txlist_done(NULL, &zlist, 0);
1499 rc = ksocknal_process_transmit(conn, tx);
1501 if (rc == -ENOMEM || rc == -EAGAIN) {
1502 /* Incomplete send: replace tx on HEAD of tx_queue */
1503 spin_lock_bh(&sched->kss_lock);
1504 list_add(&tx->tx_list,
1505 &conn->ksnc_tx_queue);
1507 /* Complete send; tx -ref */
1508 ksocknal_tx_decref(tx);
1510 spin_lock_bh(&sched->kss_lock);
1511 /* assume space for more */
1512 conn->ksnc_tx_ready = 1;
1515 if (rc == -ENOMEM) {
1516 /* Do nothing; after a short timeout, this
1517 * conn will be reposted on kss_tx_conns. */
1518 } else if (conn->ksnc_tx_ready &&
1519 !list_empty(&conn->ksnc_tx_queue)) {
1520 /* reschedule for tx */
1521 list_add_tail(&conn->ksnc_tx_list,
1522 &sched->kss_tx_conns);
1524 conn->ksnc_tx_scheduled = 0;
1526 ksocknal_conn_decref(conn);
1531 if (!did_something || /* nothing to do */
1532 ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
1533 spin_unlock_bh(&sched->kss_lock);
1537 if (!did_something) { /* wait for something to do */
1538 rc = wait_event_interruptible_exclusive(
1540 !ksocknal_sched_cansleep(sched));
1546 spin_lock_bh(&sched->kss_lock);
1550 spin_unlock_bh(&sched->kss_lock);
1551 ksocknal_thread_fini();
1556 * Add connection to kss_rx_conns of scheduler
1557 * and wakeup the scheduler.
1559 void ksocknal_read_callback (ksock_conn_t *conn)
1561 ksock_sched_t *sched;
1564 sched = conn->ksnc_scheduler;
1566 spin_lock_bh(&sched->kss_lock);
1568 conn->ksnc_rx_ready = 1;
1570 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1571 list_add_tail(&conn->ksnc_rx_list,
1572 &sched->kss_rx_conns);
1573 conn->ksnc_rx_scheduled = 1;
1574 /* extra ref for scheduler */
1575 ksocknal_conn_addref(conn);
1577 wake_up (&sched->kss_waitq);
1579 spin_unlock_bh(&sched->kss_lock);
1585 * Add connection to kss_tx_conns of scheduler
1586 * and wakeup the scheduler.
1588 void ksocknal_write_callback(ksock_conn_t *conn)
1590 ksock_sched_t *sched;
1593 sched = conn->ksnc_scheduler;
1595 spin_lock_bh(&sched->kss_lock);
1597 conn->ksnc_tx_ready = 1;
1599 if (!conn->ksnc_tx_scheduled && /* not being progressed */
1600 !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
1601 list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
1602 conn->ksnc_tx_scheduled = 1;
1603 /* extra ref for scheduler */
1604 ksocknal_conn_addref(conn);
1606 wake_up(&sched->kss_waitq);
1609 spin_unlock_bh(&sched->kss_lock);
1614 static ksock_proto_t *
1615 ksocknal_parse_proto_version (ksock_hello_msg_t *hello)
1619 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1620 version = hello->kshm_version;
1621 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1622 version = __swab32(hello->kshm_version);
1625 #if SOCKNAL_VERSION_DEBUG
1626 if (*ksocknal_tunables.ksnd_protocol == 1)
1629 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1630 version == KSOCK_PROTO_V3)
1633 if (version == KSOCK_PROTO_V2)
1634 return &ksocknal_protocol_v2x;
1636 if (version == KSOCK_PROTO_V3)
1637 return &ksocknal_protocol_v3x;
1642 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1643 lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
1645 CLASSERT (sizeof (lnet_magicversion_t) ==
1646 offsetof (ksock_hello_msg_t, kshm_src_nid));
1648 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1649 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1650 return &ksocknal_protocol_v1x;
1657 ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1658 lnet_nid_t peer_nid, ksock_hello_msg_t *hello)
1660 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1661 ksock_net_t *net = (ksock_net_t *)ni->ni_data;
1663 LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
1665 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1666 LASSERT (conn->ksnc_proto != NULL);
1668 hello->kshm_src_nid = ni->ni_nid;
1669 hello->kshm_dst_nid = peer_nid;
1670 hello->kshm_src_pid = the_lnet.ln_pid;
1672 hello->kshm_src_incarnation = net->ksnn_incarnation;
1673 hello->kshm_ctype = conn->ksnc_type;
1675 return conn->ksnc_proto->pro_send_hello(conn, hello);
1679 ksocknal_invert_type(int type)
1683 case SOCKLND_CONN_ANY:
1684 case SOCKLND_CONN_CONTROL:
1686 case SOCKLND_CONN_BULK_IN:
1687 return SOCKLND_CONN_BULK_OUT;
1688 case SOCKLND_CONN_BULK_OUT:
1689 return SOCKLND_CONN_BULK_IN;
1691 return (SOCKLND_CONN_NONE);
1696 ksocknal_recv_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1697 ksock_hello_msg_t *hello, lnet_process_id_t *peerid,
1700 /* Return < 0 fatal error
1702 * EALREADY lost connection race
1703 * EPROTO protocol version mismatch
1705 struct socket *sock = conn->ksnc_sock;
1706 int active = (conn->ksnc_proto != NULL);
1710 ksock_proto_t *proto;
1711 lnet_process_id_t recv_id;
1713 /* socket type set on active connections - not set on passive */
1714 LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1716 timeout = active ? *ksocknal_tunables.ksnd_timeout :
1717 lnet_acceptor_timeout();
1719 rc = lnet_sock_read(sock, &hello->kshm_magic,
1720 sizeof(hello->kshm_magic), timeout);
1722 CERROR("Error %d reading HELLO from %pI4h\n",
1723 rc, &conn->ksnc_ipaddr);
1728 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1729 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1730 hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1731 /* Unexpected magic! */
1732 CERROR ("Bad magic(1) %#08x (%#08x expected) from "
1733 "%pI4h\n", __cpu_to_le32 (hello->kshm_magic),
1734 LNET_PROTO_TCP_MAGIC, &conn->ksnc_ipaddr);
1738 rc = lnet_sock_read(sock, &hello->kshm_version,
1739 sizeof(hello->kshm_version), timeout);
1741 CERROR("Error %d reading HELLO from %pI4h\n",
1742 rc, &conn->ksnc_ipaddr);
1747 proto = ksocknal_parse_proto_version(hello);
1748 if (proto == NULL) {
1750 /* unknown protocol from peer, tell peer my protocol */
1751 conn->ksnc_proto = &ksocknal_protocol_v3x;
1752 #if SOCKNAL_VERSION_DEBUG
1753 if (*ksocknal_tunables.ksnd_protocol == 2)
1754 conn->ksnc_proto = &ksocknal_protocol_v2x;
1755 else if (*ksocknal_tunables.ksnd_protocol == 1)
1756 conn->ksnc_proto = &ksocknal_protocol_v1x;
1758 hello->kshm_nips = 0;
1759 ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1762 CERROR("Unknown protocol version (%d.x expected) from %pI4h\n",
1763 conn->ksnc_proto->pro_version, &conn->ksnc_ipaddr);
1768 proto_match = (conn->ksnc_proto == proto);
1769 conn->ksnc_proto = proto;
1771 /* receive the rest of hello message anyway */
1772 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1774 CERROR("Error %d reading or checking hello from from %pI4h\n",
1775 rc, &conn->ksnc_ipaddr);
1780 *incarnation = hello->kshm_src_incarnation;
1782 if (hello->kshm_src_nid == LNET_NID_ANY) {
1783 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY"
1784 "from %pI4h\n", &conn->ksnc_ipaddr);
1789 conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1790 /* Userspace NAL assigns peer process ID from socket */
1791 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1792 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1794 recv_id.nid = hello->kshm_src_nid;
1795 recv_id.pid = hello->kshm_src_pid;
1801 /* peer determines type */
1802 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1803 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1804 CERROR("Unexpected type %d from %s ip %pI4h\n",
1805 hello->kshm_ctype, libcfs_id2str(*peerid),
1806 &conn->ksnc_ipaddr);
1812 if (peerid->pid != recv_id.pid ||
1813 peerid->nid != recv_id.nid) {
1814 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1815 " %pI4h, but they claimed they were "
1816 "%s; please check your Lustre "
1818 libcfs_id2str(*peerid),
1820 libcfs_id2str(recv_id));
1824 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1825 /* Possible protocol mismatch or I lost the connection race */
1826 return proto_match ? EALREADY : EPROTO;
1829 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1830 CERROR("Mismatched types: me %d, %s ip %pI4h %d\n",
1831 conn->ksnc_type, libcfs_id2str(*peerid),
1840 ksocknal_connect (ksock_route_t *route)
1842 struct list_head zombies = LIST_HEAD_INIT(zombies);
1843 ksock_peer_t *peer = route->ksnr_peer;
1846 struct socket *sock;
1847 cfs_time_t deadline;
1848 int retry_later = 0;
1851 deadline = cfs_time_add(cfs_time_current(),
1852 cfs_time_seconds(*ksocknal_tunables.ksnd_timeout));
1854 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1856 LASSERT (route->ksnr_scheduled);
1857 LASSERT (!route->ksnr_connecting);
1859 route->ksnr_connecting = 1;
1862 wanted = ksocknal_route_mask() & ~route->ksnr_connected;
1864 /* stop connecting if peer/route got closed under me, or
1865 * route got connected while queued */
1866 if (peer->ksnp_closing || route->ksnr_deleted ||
1872 /* reschedule if peer is connecting to me */
1873 if (peer->ksnp_accepting > 0) {
1875 "peer %s(%d) already connecting to me, retry later.\n",
1876 libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting);
1880 if (retry_later) /* needs reschedule */
1883 if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) {
1884 type = SOCKLND_CONN_ANY;
1885 } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) {
1886 type = SOCKLND_CONN_CONTROL;
1887 } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) {
1888 type = SOCKLND_CONN_BULK_IN;
1890 LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0);
1891 type = SOCKLND_CONN_BULK_OUT;
1894 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1896 if (cfs_time_aftereq(cfs_time_current(), deadline)) {
1898 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1904 rc = lnet_connect(&sock, peer->ksnp_id.nid,
1905 route->ksnr_myipaddr,
1906 route->ksnr_ipaddr, route->ksnr_port);
1910 rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type);
1912 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1918 /* A +ve RC means I have to retry because I lost the connection
1919 * race or I have to renegotiate protocol version */
1920 retry_later = (rc != 0);
1922 CDEBUG(D_NET, "peer %s: conn race, retry later.\n",
1923 libcfs_nid2str(peer->ksnp_id.nid));
1925 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1928 route->ksnr_scheduled = 0;
1929 route->ksnr_connecting = 0;
1932 /* re-queue for attention; this frees me up to handle
1933 * the peer's incoming connection request */
1935 if (rc == EALREADY ||
1936 (rc == 0 && peer->ksnp_accepting > 0)) {
1937 /* We want to introduce a delay before next
1938 * attempt to connect if we lost conn race,
1939 * but the race is resolved quickly usually,
1940 * so min_reconnectms should be good heuristic */
1941 route->ksnr_retry_interval =
1942 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000;
1943 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1944 route->ksnr_retry_interval);
1947 ksocknal_launch_connection_locked(route);
1950 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1954 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1956 route->ksnr_scheduled = 0;
1957 route->ksnr_connecting = 0;
1959 /* This is a retry rather than a new connection */
1960 route->ksnr_retry_interval *= 2;
1961 route->ksnr_retry_interval =
1962 MAX(route->ksnr_retry_interval,
1963 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000);
1964 route->ksnr_retry_interval =
1965 MIN(route->ksnr_retry_interval,
1966 cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000);
1968 LASSERT (route->ksnr_retry_interval != 0);
1969 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1970 route->ksnr_retry_interval);
1972 if (!list_empty(&peer->ksnp_tx_queue) &&
1973 peer->ksnp_accepting == 0 &&
1974 ksocknal_find_connecting_route_locked(peer) == NULL) {
1977 /* ksnp_tx_queue is queued on a conn on successful
1978 * connection for V1.x and V2.x */
1979 if (!list_empty(&peer->ksnp_conns)) {
1980 conn = list_entry(peer->ksnp_conns.next,
1981 ksock_conn_t, ksnc_list);
1982 LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
1985 /* take all the blocked packets while I've got the lock and
1986 * complete below... */
1987 list_splice_init(&peer->ksnp_tx_queue, &zombies);
1990 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1992 ksocknal_peer_failed(peer);
1993 ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
1998 * check whether we need to create more connds.
1999 * It will try to create new thread if it's necessary, @timeout can
2000 * be updated if failed to create, so caller wouldn't keep try while
2001 * running out of resource.
2004 ksocknal_connd_check_start(long sec, long *timeout)
2008 int total = ksocknal_data.ksnd_connd_starting +
2009 ksocknal_data.ksnd_connd_running;
2011 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2012 /* still in initializing */
2016 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2017 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2018 /* can't create more connd, or still have enough
2019 * threads to handle more connecting */
2023 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2024 /* no pending connecting request */
2028 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2029 /* may run out of resource, retry later */
2030 *timeout = cfs_time_seconds(1);
2034 if (ksocknal_data.ksnd_connd_starting > 0) {
2035 /* serialize starting to avoid flood */
2039 ksocknal_data.ksnd_connd_starting_stamp = sec;
2040 ksocknal_data.ksnd_connd_starting++;
2041 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2043 /* NB: total is the next id */
2044 snprintf(name, sizeof(name), "socknal_cd%02d", total);
2045 rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
2047 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2052 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2053 ksocknal_data.ksnd_connd_starting--;
2054 ksocknal_data.ksnd_connd_failed_stamp = cfs_time_current_sec();
2060 * check whether current thread can exit, it will return 1 if there are too
2061 * many threads and no creating in past 120 seconds.
2062 * Also, this function may update @timeout to make caller come back
2063 * again to recheck these conditions.
2066 ksocknal_connd_check_stop(long sec, long *timeout)
2070 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2071 /* still in initializing */
2075 if (ksocknal_data.ksnd_connd_starting > 0) {
2076 /* in progress of starting new thread */
2080 if (ksocknal_data.ksnd_connd_running <=
2081 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2085 /* created thread in past 120 seconds? */
2086 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2087 SOCKNAL_CONND_TIMEOUT - sec);
2089 *timeout = (val > 0) ? cfs_time_seconds(val) :
2090 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2094 /* no creating in past 120 seconds */
2096 return ksocknal_data.ksnd_connd_running >
2097 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2100 /* Go through connd_routes queue looking for a route that we can process
2101 * right now, @timeout_p can be updated if we need to come back later */
2102 static ksock_route_t *
2103 ksocknal_connd_get_route_locked(signed long *timeout_p)
2105 ksock_route_t *route;
2108 now = cfs_time_current();
2110 /* connd_routes can contain both pending and ordinary routes */
2111 list_for_each_entry(route, &ksocknal_data.ksnd_connd_routes,
2114 if (route->ksnr_retry_interval == 0 ||
2115 cfs_time_aftereq(now, route->ksnr_timeout))
2118 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2119 (int)*timeout_p > (int)(route->ksnr_timeout - now))
2120 *timeout_p = (int)(route->ksnr_timeout - now);
2127 ksocknal_connd (void *arg)
2129 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2130 ksock_connreq_t *cr;
2135 cfs_block_allsigs();
2137 init_waitqueue_entry(&wait, current);
2139 spin_lock_bh(connd_lock);
2141 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2142 ksocknal_data.ksnd_connd_starting--;
2143 ksocknal_data.ksnd_connd_running++;
2145 while (!ksocknal_data.ksnd_shuttingdown) {
2146 ksock_route_t *route = NULL;
2147 long sec = cfs_time_current_sec();
2148 long timeout = MAX_SCHEDULE_TIMEOUT;
2149 int dropped_lock = 0;
2151 if (ksocknal_connd_check_stop(sec, &timeout)) {
2152 /* wakeup another one to check stop */
2153 wake_up(&ksocknal_data.ksnd_connd_waitq);
2157 if (ksocknal_connd_check_start(sec, &timeout)) {
2158 /* created new thread */
2162 if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2163 /* Connection accepted by the listener */
2164 cr = list_entry(ksocknal_data.ksnd_connd_connreqs. \
2165 next, ksock_connreq_t, ksncr_list);
2167 list_del(&cr->ksncr_list);
2168 spin_unlock_bh(connd_lock);
2171 ksocknal_create_conn(cr->ksncr_ni, NULL,
2172 cr->ksncr_sock, SOCKLND_CONN_NONE);
2173 lnet_ni_decref(cr->ksncr_ni);
2174 LIBCFS_FREE(cr, sizeof(*cr));
2176 spin_lock_bh(connd_lock);
2179 /* Only handle an outgoing connection request if there
2180 * is a thread left to handle incoming connections and
2181 * create new connd */
2182 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2183 ksocknal_data.ksnd_connd_running) {
2184 route = ksocknal_connd_get_route_locked(&timeout);
2186 if (route != NULL) {
2187 list_del(&route->ksnr_connd_list);
2188 ksocknal_data.ksnd_connd_connecting++;
2189 spin_unlock_bh(connd_lock);
2192 if (ksocknal_connect(route)) {
2193 /* consecutive retry */
2194 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2195 CWARN("massive consecutive "
2196 "re-connecting to %pI4h\n",
2197 &route->ksnr_ipaddr);
2204 ksocknal_route_decref(route);
2206 spin_lock_bh(connd_lock);
2207 ksocknal_data.ksnd_connd_connecting--;
2211 if (++nloops < SOCKNAL_RESCHED)
2213 spin_unlock_bh(connd_lock);
2216 spin_lock_bh(connd_lock);
2220 /* Nothing to do for 'timeout' */
2221 set_current_state(TASK_INTERRUPTIBLE);
2222 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
2223 spin_unlock_bh(connd_lock);
2226 schedule_timeout(timeout);
2228 set_current_state(TASK_RUNNING);
2229 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2230 spin_lock_bh(connd_lock);
2232 ksocknal_data.ksnd_connd_running--;
2233 spin_unlock_bh(connd_lock);
2235 ksocknal_thread_fini();
2239 static ksock_conn_t *
2240 ksocknal_find_timed_out_conn (ksock_peer_t *peer)
2242 /* We're called with a shared lock on ksnd_global_lock */
2244 struct list_head *ctmp;
2246 list_for_each(ctmp, &peer->ksnp_conns) {
2248 conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
2250 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2251 LASSERT (!conn->ksnc_closing);
2253 error = conn->ksnc_sock->sk->sk_err;
2255 ksocknal_conn_addref(conn);
2259 CNETERR("A connection with %s "
2260 "(%pI4h:%d) was reset; "
2261 "it may have rebooted.\n",
2262 libcfs_id2str(peer->ksnp_id),
2267 CNETERR("A connection with %s "
2268 "(%pI4h:%d) timed out; the "
2269 "network or node may be down.\n",
2270 libcfs_id2str(peer->ksnp_id),
2275 CNETERR("An unexpected network error %d "
2277 "(%pI4h:%d\n", error,
2278 libcfs_id2str(peer->ksnp_id),
2287 if (conn->ksnc_rx_started &&
2288 cfs_time_aftereq(cfs_time_current(),
2289 conn->ksnc_rx_deadline)) {
2290 /* Timed out incomplete incoming message */
2291 ksocknal_conn_addref(conn);
2292 CNETERR("Timeout receiving from %s (%pI4h:%d), "
2293 "state %d wanted %d left %d\n",
2294 libcfs_id2str(peer->ksnp_id),
2297 conn->ksnc_rx_state,
2298 conn->ksnc_rx_nob_wanted,
2299 conn->ksnc_rx_nob_left);
2303 if ((!list_empty(&conn->ksnc_tx_queue) ||
2304 conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
2305 cfs_time_aftereq(cfs_time_current(),
2306 conn->ksnc_tx_deadline)) {
2307 /* Timed out messages queued for sending or
2308 * buffered in the socket's send buffer */
2309 ksocknal_conn_addref(conn);
2310 CNETERR("Timeout sending data to %s (%pI4h:%d) "
2311 "the network or that node may be down.\n",
2312 libcfs_id2str(peer->ksnp_id),
2313 &conn->ksnc_ipaddr, conn->ksnc_port);
2322 ksocknal_flush_stale_txs(ksock_peer_t *peer)
2325 struct list_head stale_txs = LIST_HEAD_INIT(stale_txs);
2327 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2329 while (!list_empty(&peer->ksnp_tx_queue)) {
2330 tx = list_entry(peer->ksnp_tx_queue.next,
2331 ksock_tx_t, tx_list);
2333 if (!cfs_time_aftereq(cfs_time_current(),
2337 list_del(&tx->tx_list);
2338 list_add_tail(&tx->tx_list, &stale_txs);
2341 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2343 ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
2347 ksocknal_send_keepalive_locked(ksock_peer_t *peer)
2348 __must_hold(&ksocknal_data.ksnd_global_lock)
2350 ksock_sched_t *sched;
2354 /* last_alive will be updated by create_conn */
2355 if (list_empty(&peer->ksnp_conns))
2358 if (peer->ksnp_proto != &ksocknal_protocol_v3x)
2361 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2362 cfs_time_before(cfs_time_current(),
2363 cfs_time_add(peer->ksnp_last_alive,
2364 cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
2367 if (cfs_time_before(cfs_time_current(),
2368 peer->ksnp_send_keepalive))
2371 /* retry 10 secs later, so we wouldn't put pressure
2372 * on this peer if we failed to send keepalive this time */
2373 peer->ksnp_send_keepalive = cfs_time_shift(10);
2375 conn = ksocknal_find_conn_locked(peer, NULL, 1);
2377 sched = conn->ksnc_scheduler;
2379 spin_lock_bh(&sched->kss_lock);
2380 if (!list_empty(&conn->ksnc_tx_queue)) {
2381 spin_unlock_bh(&sched->kss_lock);
2382 /* there is an queued ACK, don't need keepalive */
2386 spin_unlock_bh(&sched->kss_lock);
2389 read_unlock(&ksocknal_data.ksnd_global_lock);
2391 /* cookie = 1 is reserved for keepalive PING */
2392 tx = ksocknal_alloc_tx_noop(1, 1);
2394 read_lock(&ksocknal_data.ksnd_global_lock);
2398 if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) {
2399 read_lock(&ksocknal_data.ksnd_global_lock);
2403 ksocknal_free_tx(tx);
2404 read_lock(&ksocknal_data.ksnd_global_lock);
2411 ksocknal_check_peer_timeouts (int idx)
2413 struct list_head *peers = &ksocknal_data.ksnd_peers[idx];
2419 /* NB. We expect to have a look at all the peers and not find any
2420 * connections to time out, so we just use a shared lock while we
2422 read_lock(&ksocknal_data.ksnd_global_lock);
2424 list_for_each_entry(peer, peers, ksnp_list) {
2425 ksock_tx_t *tx_stale;
2426 cfs_time_t deadline = 0;
2430 if (ksocknal_send_keepalive_locked(peer) != 0) {
2431 read_unlock(&ksocknal_data.ksnd_global_lock);
2435 conn = ksocknal_find_timed_out_conn (peer);
2438 read_unlock(&ksocknal_data.ksnd_global_lock);
2440 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2442 /* NB we won't find this one again, but we can't
2443 * just proceed with the next peer, since we dropped
2444 * ksnd_global_lock and it might be dead already! */
2445 ksocknal_conn_decref(conn);
2449 /* we can't process stale txs right here because we're
2450 * holding only shared lock */
2451 if (!list_empty(&peer->ksnp_tx_queue)) {
2453 list_entry(peer->ksnp_tx_queue.next,
2454 ksock_tx_t, tx_list);
2456 if (cfs_time_aftereq(cfs_time_current(),
2459 ksocknal_peer_addref(peer);
2460 read_unlock(&ksocknal_data.ksnd_global_lock);
2462 ksocknal_flush_stale_txs(peer);
2464 ksocknal_peer_decref(peer);
2469 if (list_empty(&peer->ksnp_zc_req_list))
2473 spin_lock(&peer->ksnp_lock);
2474 list_for_each_entry(tx, &peer->ksnp_zc_req_list, tx_zc_list) {
2475 if (!cfs_time_aftereq(cfs_time_current(),
2478 /* ignore the TX if connection is being closed */
2479 if (tx->tx_conn->ksnc_closing)
2482 if (tx_stale == NULL)
2486 if (tx_stale == NULL) {
2487 spin_unlock(&peer->ksnp_lock);
2491 deadline = tx_stale->tx_deadline;
2492 resid = tx_stale->tx_resid;
2493 conn = tx_stale->tx_conn;
2494 ksocknal_conn_addref(conn);
2496 spin_unlock(&peer->ksnp_lock);
2497 read_unlock(&ksocknal_data.ksnd_global_lock);
2499 CERROR("Total %d stale ZC_REQs for peer %s detected; the "
2500 "oldest(%p) timed out %ld secs ago, "
2501 "resid: %d, wmem: %d\n",
2502 n, libcfs_nid2str(peer->ksnp_id.nid), tx_stale,
2503 cfs_duration_sec(cfs_time_current() - deadline),
2504 resid, conn->ksnc_sock->sk->sk_wmem_queued);
2506 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2507 ksocknal_conn_decref(conn);
2511 read_unlock(&ksocknal_data.ksnd_global_lock);
2514 int ksocknal_reaper(void *arg)
2518 ksock_sched_t *sched;
2519 struct list_head enomem_conns;
2521 cfs_duration_t timeout;
2524 cfs_time_t deadline = cfs_time_current();
2526 cfs_block_allsigs ();
2528 INIT_LIST_HEAD(&enomem_conns);
2529 init_waitqueue_entry(&wait, current);
2531 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2533 while (!ksocknal_data.ksnd_shuttingdown) {
2535 if (!list_empty(&ksocknal_data.ksnd_deathrow_conns)) {
2536 conn = list_entry(ksocknal_data. \
2537 ksnd_deathrow_conns.next,
2538 ksock_conn_t, ksnc_list);
2539 list_del(&conn->ksnc_list);
2541 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2543 ksocknal_terminate_conn(conn);
2544 ksocknal_conn_decref(conn);
2546 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2550 if (!list_empty(&ksocknal_data.ksnd_zombie_conns)) {
2551 conn = list_entry(ksocknal_data.ksnd_zombie_conns.\
2552 next, ksock_conn_t, ksnc_list);
2553 list_del(&conn->ksnc_list);
2555 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2557 ksocknal_destroy_conn(conn);
2559 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2563 if (!list_empty(&ksocknal_data.ksnd_enomem_conns)) {
2564 list_add(&enomem_conns,
2565 &ksocknal_data.ksnd_enomem_conns);
2566 list_del_init(&ksocknal_data.ksnd_enomem_conns);
2569 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2571 /* reschedule all the connections that stalled with ENOMEM... */
2573 while (!list_empty(&enomem_conns)) {
2574 conn = list_entry(enomem_conns.next,
2575 ksock_conn_t, ksnc_tx_list);
2576 list_del(&conn->ksnc_tx_list);
2578 sched = conn->ksnc_scheduler;
2580 spin_lock_bh(&sched->kss_lock);
2582 LASSERT(conn->ksnc_tx_scheduled);
2583 conn->ksnc_tx_ready = 1;
2584 list_add_tail(&conn->ksnc_tx_list,
2585 &sched->kss_tx_conns);
2586 wake_up(&sched->kss_waitq);
2588 spin_unlock_bh(&sched->kss_lock);
2592 /* careful with the jiffy wrap... */
2593 while ((timeout = cfs_time_sub(deadline,
2594 cfs_time_current())) <= 0) {
2597 int chunk = ksocknal_data.ksnd_peer_hash_size;
2599 /* Time to check for timeouts on a few more peers: I do
2600 * checks every 'p' seconds on a proportion of the peer
2601 * table and I need to check every connection 'n' times
2602 * within a timeout interval, to ensure I detect a
2603 * timeout on any connection within (n+1)/n times the
2604 * timeout interval. */
2606 if (*ksocknal_tunables.ksnd_timeout > n * p)
2607 chunk = (chunk * n * p) /
2608 *ksocknal_tunables.ksnd_timeout;
2612 for (i = 0; i < chunk; i++) {
2613 ksocknal_check_peer_timeouts (peer_index);
2614 peer_index = (peer_index + 1) %
2615 ksocknal_data.ksnd_peer_hash_size;
2618 deadline = cfs_time_add(deadline, cfs_time_seconds(p));
2621 if (nenomem_conns != 0) {
2622 /* Reduce my timeout if I rescheduled ENOMEM conns.
2623 * This also prevents me getting woken immediately
2624 * if any go back on my enomem list. */
2625 timeout = SOCKNAL_ENOMEM_RETRY;
2627 ksocknal_data.ksnd_reaper_waketime =
2628 cfs_time_add(cfs_time_current(), timeout);
2630 set_current_state(TASK_INTERRUPTIBLE);
2631 add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2633 if (!ksocknal_data.ksnd_shuttingdown &&
2634 list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
2635 list_empty(&ksocknal_data.ksnd_zombie_conns))
2636 schedule_timeout(timeout);
2638 set_current_state(TASK_RUNNING);
2639 remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2641 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2644 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2646 ksocknal_thread_fini();