2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
4 * Copyright (c) 2011, 2012, 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 Portals, http://www.sf.net/projects/sandiaportals/
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 iovec *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 = (void *)((char *)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 iovec *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 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 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. */
348 if (ksocknal_data.ksnd_stall_rx != 0) {
349 set_current_state(TASK_UNINTERRUPTIBLE);
350 schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
353 rc = ksocknal_connsock_addref(conn);
355 LASSERT (conn->ksnc_closing);
360 if (conn->ksnc_rx_niov != 0)
361 rc = ksocknal_recv_iov (conn);
363 rc = ksocknal_recv_kiov (conn);
366 /* error/EOF or partial receive */
369 } else if (rc == 0 && conn->ksnc_rx_started) {
370 /* EOF in the middle of a message */
376 /* Completed a fragment */
378 if (conn->ksnc_rx_nob_wanted == 0) {
384 ksocknal_connsock_decref(conn);
389 ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
391 lnet_msg_t *lnetmsg = tx->tx_lnetmsg;
392 int rc = (tx->tx_resid == 0 && !tx->tx_zc_aborted) ? 0 : -EIO;
394 LASSERT(ni != NULL || tx->tx_conn != NULL);
396 if (tx->tx_conn != NULL)
397 ksocknal_conn_decref(tx->tx_conn);
399 if (ni == NULL && tx->tx_conn != NULL)
400 ni = tx->tx_conn->ksnc_peer->ksnp_ni;
402 ksocknal_free_tx (tx);
403 if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */
404 lnet_finalize (ni, lnetmsg, rc);
408 ksocknal_txlist_done (lnet_ni_t *ni, struct list_head *txlist, int error)
412 while (!list_empty (txlist)) {
413 tx = list_entry (txlist->next, ksock_tx_t, tx_list);
415 if (error && tx->tx_lnetmsg != NULL) {
416 CNETERR("Deleting packet type %d len %d %s->%s\n",
417 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
418 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
419 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
420 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
422 CNETERR("Deleting noop packet\n");
425 list_del (&tx->tx_list);
427 LASSERT (atomic_read(&tx->tx_refcount) == 1);
428 ksocknal_tx_done (ni, tx);
433 ksocknal_check_zc_req(ksock_tx_t *tx)
435 ksock_conn_t *conn = tx->tx_conn;
436 ksock_peer_t *peer = conn->ksnc_peer;
438 /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
439 * to ksnp_zc_req_list if some fragment of this message should be sent
440 * zero-copy. Our peer will send an ACK containing this cookie when
441 * she has received this message to tell us we can signal completion.
442 * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
443 * ksnp_zc_req_list. */
444 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
445 LASSERT (tx->tx_zc_capable);
447 tx->tx_zc_checked = 1;
449 if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
450 !conn->ksnc_zc_capable)
453 /* assign cookie and queue tx to pending list, it will be released when
454 * a matching ack is received. See ksocknal_handle_zcack() */
456 ksocknal_tx_addref(tx);
458 spin_lock(&peer->ksnp_lock);
460 /* ZC_REQ is going to be pinned to the peer */
462 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
464 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
466 tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
468 if (peer->ksnp_zc_next_cookie == 0)
469 peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
471 list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
473 spin_unlock(&peer->ksnp_lock);
477 ksocknal_uncheck_zc_req(ksock_tx_t *tx)
479 ksock_peer_t *peer = tx->tx_conn->ksnc_peer;
481 LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
482 LASSERT(tx->tx_zc_capable);
484 tx->tx_zc_checked = 0;
486 spin_lock(&peer->ksnp_lock);
488 if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
489 /* Not waiting for an ACK */
490 spin_unlock(&peer->ksnp_lock);
494 tx->tx_msg.ksm_zc_cookies[0] = 0;
495 list_del(&tx->tx_zc_list);
497 spin_unlock(&peer->ksnp_lock);
499 ksocknal_tx_decref(tx);
503 ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
507 if (tx->tx_zc_capable && !tx->tx_zc_checked)
508 ksocknal_check_zc_req(tx);
510 rc = ksocknal_transmit (conn, tx);
512 CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc);
514 if (tx->tx_resid == 0) {
515 /* Sent everything OK */
527 counter++; /* exponential backoff warnings */
528 if ((counter & (-counter)) == counter)
529 CWARN("%u ENOMEM tx %p (%u allocated)\n",
530 counter, conn, atomic_read(&libcfs_kmemory));
532 /* Queue on ksnd_enomem_conns for retry after a timeout */
533 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
535 /* enomem list takes over scheduler's ref... */
536 LASSERT (conn->ksnc_tx_scheduled);
537 list_add_tail(&conn->ksnc_tx_list,
538 &ksocknal_data.ksnd_enomem_conns);
539 if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
540 SOCKNAL_ENOMEM_RETRY),
541 ksocknal_data.ksnd_reaper_waketime))
542 wake_up (&ksocknal_data.ksnd_reaper_waitq);
544 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
551 if (!conn->ksnc_closing) {
554 LCONSOLE_WARN("Host %pI4h reset our connection "
555 "while we were sending data; it may have "
560 LCONSOLE_WARN("There was an unexpected network error "
561 "while writing to %pI4h: %d.\n",
562 &conn->ksnc_ipaddr, rc);
565 CDEBUG(D_NET, "[%p] Error %d on write to %s"
566 " ip %pI4h:%d\n", conn, rc,
567 libcfs_id2str(conn->ksnc_peer->ksnp_id),
572 if (tx->tx_zc_checked)
573 ksocknal_uncheck_zc_req(tx);
575 /* it's not an error if conn is being closed */
576 ksocknal_close_conn_and_siblings (conn,
577 (conn->ksnc_closing) ? 0 : rc);
583 ksocknal_launch_connection_locked (ksock_route_t *route)
586 /* called holding write lock on ksnd_global_lock */
588 LASSERT (!route->ksnr_scheduled);
589 LASSERT (!route->ksnr_connecting);
590 LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
592 route->ksnr_scheduled = 1; /* scheduling conn for connd */
593 ksocknal_route_addref(route); /* extra ref for connd */
595 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
597 list_add_tail(&route->ksnr_connd_list,
598 &ksocknal_data.ksnd_connd_routes);
599 wake_up(&ksocknal_data.ksnd_connd_waitq);
601 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
605 ksocknal_launch_all_connections_locked (ksock_peer_t *peer)
607 ksock_route_t *route;
609 /* called holding write lock on ksnd_global_lock */
611 /* launch any/all connections that need it */
612 route = ksocknal_find_connectable_route_locked(peer);
616 ksocknal_launch_connection_locked(route);
621 ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk)
623 struct list_head *tmp;
625 ksock_conn_t *typed = NULL;
626 ksock_conn_t *fallback = NULL;
630 list_for_each (tmp, &peer->ksnp_conns) {
631 ksock_conn_t *c = list_entry(tmp, ksock_conn_t, ksnc_list);
632 int nob = atomic_read(&c->ksnc_tx_nob) +
633 c->ksnc_sock->sk->sk_wmem_queued;
636 LASSERT (!c->ksnc_closing);
637 LASSERT (c->ksnc_proto != NULL &&
638 c->ksnc_proto->pro_match_tx != NULL);
640 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
645 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
648 case SOCKNAL_MATCH_YES: /* typed connection */
649 if (typed == NULL || tnob > nob ||
650 (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
651 cfs_time_after(typed->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
657 case SOCKNAL_MATCH_MAY: /* fallback connection */
658 if (fallback == NULL || fnob > nob ||
659 (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
660 cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
668 /* prefer the typed selection */
669 conn = (typed != NULL) ? typed : fallback;
672 conn->ksnc_tx_last_post = cfs_time_current();
678 ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *tx)
680 conn->ksnc_proto->pro_pack(tx);
682 atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
683 ksocknal_conn_addref(conn); /* +1 ref for tx */
688 ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn)
690 ksock_sched_t *sched = conn->ksnc_scheduler;
691 ksock_msg_t *msg = &tx->tx_msg;
692 ksock_tx_t *ztx = NULL;
695 /* called holding global lock (read or irq-write) and caller may
696 * not have dropped this lock between finding conn and calling me,
697 * so we don't need the {get,put}connsock dance to deref
699 LASSERT(!conn->ksnc_closing);
701 CDEBUG(D_NET, "Sending to %s ip %pI4h:%d\n",
702 libcfs_id2str(conn->ksnc_peer->ksnp_id),
706 ksocknal_tx_prep(conn, tx);
708 /* Ensure the frags we've been given EXACTLY match the number of
709 * bytes we want to send. Many TCP/IP stacks disregard any total
710 * size parameters passed to them and just look at the frags.
712 * We always expect at least 1 mapped fragment containing the
713 * complete ksocknal message header. */
714 LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
715 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
716 (unsigned int)tx->tx_nob);
717 LASSERT (tx->tx_niov >= 1);
718 LASSERT (tx->tx_resid == tx->tx_nob);
720 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
721 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
723 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
726 * FIXME: SOCK_WMEM_QUEUED and SOCK_ERROR could block in __DARWIN8__
727 * but they're used inside spinlocks a lot.
729 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
730 spin_lock_bh(&sched->kss_lock);
732 if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
733 /* First packet starts the timeout */
734 conn->ksnc_tx_deadline =
735 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
736 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
737 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
738 conn->ksnc_tx_bufnob = 0;
739 mb(); /* order with adding to tx_queue */
742 if (msg->ksm_type == KSOCK_MSG_NOOP) {
743 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
744 * on a normal packet so I don't need to send it */
745 LASSERT (msg->ksm_zc_cookies[1] != 0);
746 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
748 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
749 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
752 /* It's a normal packet - can it piggback a noop zc-ack that
753 * has been queued already? */
754 LASSERT (msg->ksm_zc_cookies[1] == 0);
755 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
757 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
758 /* ztx will be released later */
762 atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
763 list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
766 if (conn->ksnc_tx_ready && /* able to send */
767 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
768 /* +1 ref for scheduler */
769 ksocknal_conn_addref(conn);
770 list_add_tail (&conn->ksnc_tx_list,
771 &sched->kss_tx_conns);
772 conn->ksnc_tx_scheduled = 1;
773 wake_up (&sched->kss_waitq);
776 spin_unlock_bh(&sched->kss_lock);
781 ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
783 unsigned long now = cfs_time_current();
784 struct list_head *tmp;
785 ksock_route_t *route;
787 list_for_each (tmp, &peer->ksnp_routes) {
788 route = list_entry (tmp, ksock_route_t, ksnr_list);
790 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
792 if (route->ksnr_scheduled) /* connections being established */
795 /* all route types connected ? */
796 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
799 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
800 cfs_time_aftereq(now, route->ksnr_timeout))) {
802 "Too soon to retry route %pI4h "
803 "(cnted %d, interval %ld, %ld secs later)\n",
805 route->ksnr_connected,
806 route->ksnr_retry_interval,
807 cfs_duration_sec(route->ksnr_timeout - now));
818 ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
820 struct list_head *tmp;
821 ksock_route_t *route;
823 list_for_each (tmp, &peer->ksnp_routes) {
824 route = list_entry (tmp, ksock_route_t, ksnr_list);
826 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
828 if (route->ksnr_scheduled)
836 ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
844 LASSERT (tx->tx_conn == NULL);
846 g_lock = &ksocknal_data.ksnd_global_lock;
848 for (retry = 0;; retry = 1) {
850 peer = ksocknal_find_peer_locked(ni, id);
852 if (ksocknal_find_connectable_route_locked(peer) == NULL) {
853 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
855 /* I've got no routes that need to be
856 * connecting and I do have an actual
858 ksocknal_queue_tx_locked (tx, conn);
865 /* I'll need a write lock... */
868 write_lock_bh(g_lock);
870 peer = ksocknal_find_peer_locked(ni, id);
874 write_unlock_bh(g_lock);
876 if ((id.pid & LNET_PID_USERFLAG) != 0) {
877 CERROR("Refusing to create a connection to "
878 "userspace process %s\n", libcfs_id2str(id));
879 return -EHOSTUNREACH;
883 CERROR("Can't find peer %s\n", libcfs_id2str(id));
884 return -EHOSTUNREACH;
887 rc = ksocknal_add_peer(ni, id,
888 LNET_NIDADDR(id.nid),
889 lnet_acceptor_port());
891 CERROR("Can't add peer %s: %d\n",
892 libcfs_id2str(id), rc);
897 ksocknal_launch_all_connections_locked(peer);
899 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
901 /* Connection exists; queue message on it */
902 ksocknal_queue_tx_locked (tx, conn);
903 write_unlock_bh(g_lock);
907 if (peer->ksnp_accepting > 0 ||
908 ksocknal_find_connecting_route_locked (peer) != NULL) {
909 /* the message is going to be pinned to the peer */
911 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
913 /* Queue the message until a connection is established */
914 list_add_tail (&tx->tx_list, &peer->ksnp_tx_queue);
915 write_unlock_bh(g_lock);
919 write_unlock_bh(g_lock);
921 /* NB Routes may be ignored if connections to them failed recently */
922 CNETERR("No usable routes to %s\n", libcfs_id2str(id));
923 return -EHOSTUNREACH;
927 ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
930 int type = lntmsg->msg_type;
931 lnet_process_id_t target = lntmsg->msg_target;
932 unsigned int payload_niov = lntmsg->msg_niov;
933 struct iovec *payload_iov = lntmsg->msg_iov;
934 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
935 unsigned int payload_offset = lntmsg->msg_offset;
936 unsigned int payload_nob = lntmsg->msg_len;
941 /* NB 'private' is different depending on what we're sending.
942 * Just ignore it... */
944 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
945 payload_nob, payload_niov, libcfs_id2str(target));
947 LASSERT (payload_nob == 0 || payload_niov > 0);
948 LASSERT (payload_niov <= LNET_MAX_IOV);
949 /* payload is either all vaddrs or all pages */
950 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
951 LASSERT (!in_interrupt ());
953 if (payload_iov != NULL)
954 desc_size = offsetof(ksock_tx_t,
955 tx_frags.virt.iov[1 + payload_niov]);
957 desc_size = offsetof(ksock_tx_t,
958 tx_frags.paged.kiov[payload_niov]);
960 if (lntmsg->msg_vmflush)
961 mpflag = cfs_memory_pressure_get_and_set();
962 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
964 CERROR("Can't allocate tx desc type %d size %d\n",
966 if (lntmsg->msg_vmflush)
967 cfs_memory_pressure_restore(mpflag);
971 tx->tx_conn = NULL; /* set when assigned a conn */
972 tx->tx_lnetmsg = lntmsg;
974 if (payload_iov != NULL) {
977 tx->tx_iov = tx->tx_frags.virt.iov;
979 lnet_extract_iov(payload_niov, &tx->tx_iov[1],
980 payload_niov, payload_iov,
981 payload_offset, payload_nob);
984 tx->tx_iov = &tx->tx_frags.paged.iov;
985 tx->tx_kiov = tx->tx_frags.paged.kiov;
986 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
987 payload_niov, payload_kiov,
988 payload_offset, payload_nob);
990 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
991 tx->tx_zc_capable = 1;
994 socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_LNET);
996 /* The first fragment will be set later in pro_pack */
997 rc = ksocknal_launch_packet(ni, tx, target);
999 cfs_memory_pressure_restore(mpflag);
1004 ksocknal_free_tx(tx);
1009 ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
1011 struct task_struct *task = kthread_run(fn, arg, "%s", name);
1014 return PTR_ERR(task);
1016 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1017 ksocknal_data.ksnd_nthreads++;
1018 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1023 ksocknal_thread_fini (void)
1025 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1026 ksocknal_data.ksnd_nthreads--;
1027 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1031 ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
1033 static char ksocknal_slop_buffer[4096];
1039 LASSERT(conn->ksnc_proto != NULL);
1041 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1042 /* Remind the socket to ack eagerly... */
1043 ksocknal_lib_eager_ack(conn);
1046 if (nob_to_skip == 0) { /* right at next packet boundary now */
1047 conn->ksnc_rx_started = 0;
1048 mb(); /* racing with timeout thread */
1050 switch (conn->ksnc_proto->pro_version) {
1051 case KSOCK_PROTO_V2:
1052 case KSOCK_PROTO_V3:
1053 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1054 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1055 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1057 conn->ksnc_rx_nob_wanted = offsetof(ksock_msg_t, ksm_u);
1058 conn->ksnc_rx_nob_left = offsetof(ksock_msg_t, ksm_u);
1059 conn->ksnc_rx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u);
1062 case KSOCK_PROTO_V1:
1063 /* Receiving bare lnet_hdr_t */
1064 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1065 conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
1066 conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
1068 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1069 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1070 conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t);
1076 conn->ksnc_rx_niov = 1;
1078 conn->ksnc_rx_kiov = NULL;
1079 conn->ksnc_rx_nkiov = 0;
1080 conn->ksnc_rx_csum = ~0;
1084 /* Set up to skip as much as possible now. If there's more left
1085 * (ran out of iov entries) we'll get called again */
1087 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1088 conn->ksnc_rx_nob_left = nob_to_skip;
1089 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1094 nob = MIN (nob_to_skip, sizeof (ksocknal_slop_buffer));
1096 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1097 conn->ksnc_rx_iov[niov].iov_len = nob;
1102 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1103 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof (struct iovec));
1105 conn->ksnc_rx_niov = niov;
1106 conn->ksnc_rx_kiov = NULL;
1107 conn->ksnc_rx_nkiov = 0;
1108 conn->ksnc_rx_nob_wanted = skipped;
1113 ksocknal_process_receive (ksock_conn_t *conn)
1116 lnet_process_id_t *id;
1119 LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
1121 /* NB: sched lock NOT held */
1122 /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
1123 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1124 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1125 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1126 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1128 if (conn->ksnc_rx_nob_wanted != 0) {
1129 rc = ksocknal_receive(conn);
1132 LASSERT (rc != -EAGAIN);
1135 CDEBUG(D_NET, "[%p] EOF from %s"
1136 " ip %pI4h:%d\n", conn,
1137 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1140 else if (!conn->ksnc_closing)
1141 CERROR("[%p] Error %d on read from %s"
1144 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1148 /* it's not an error if conn is being closed */
1149 ksocknal_close_conn_and_siblings (conn,
1150 (conn->ksnc_closing) ? 0 : rc);
1151 return (rc == 0 ? -ESHUTDOWN : rc);
1154 if (conn->ksnc_rx_nob_wanted != 0) {
1159 switch (conn->ksnc_rx_state) {
1160 case SOCKNAL_RX_KSM_HEADER:
1161 if (conn->ksnc_flip) {
1162 __swab32s(&conn->ksnc_msg.ksm_type);
1163 __swab32s(&conn->ksnc_msg.ksm_csum);
1164 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1165 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1168 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1169 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1170 CERROR("%s: Unknown message type: %x\n",
1171 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1172 conn->ksnc_msg.ksm_type);
1173 ksocknal_new_packet(conn, 0);
1174 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1178 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1179 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1180 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1181 /* NOOP Checksum error */
1182 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1183 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1184 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1185 ksocknal_new_packet(conn, 0);
1186 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1190 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1193 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1195 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1196 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1198 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1199 conn->ksnc_msg.ksm_zc_cookies[1]);
1202 CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
1203 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1204 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1205 ksocknal_new_packet(conn, 0);
1206 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1211 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1212 ksocknal_new_packet (conn, 0);
1213 return 0; /* NOOP is done and just return */
1216 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1217 conn->ksnc_rx_nob_wanted = sizeof(ksock_lnet_msg_t);
1218 conn->ksnc_rx_nob_left = sizeof(ksock_lnet_msg_t);
1220 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1221 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1222 conn->ksnc_rx_iov[0].iov_len = sizeof(ksock_lnet_msg_t);
1224 conn->ksnc_rx_niov = 1;
1225 conn->ksnc_rx_kiov = NULL;
1226 conn->ksnc_rx_nkiov = 0;
1228 goto again; /* read lnet header now */
1230 case SOCKNAL_RX_LNET_HEADER:
1231 /* unpack message header */
1232 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1234 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1235 /* Userspace peer */
1236 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1237 id = &conn->ksnc_peer->ksnp_id;
1239 /* Substitute process ID assigned at connection time */
1240 lhdr->src_pid = cpu_to_le32(id->pid);
1241 lhdr->src_nid = cpu_to_le64(id->nid);
1244 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1245 ksocknal_conn_addref(conn); /* ++ref while parsing */
1247 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1248 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1249 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1251 /* I just received garbage: give up on this conn */
1252 ksocknal_new_packet(conn, 0);
1253 ksocknal_close_conn_and_siblings (conn, rc);
1254 ksocknal_conn_decref(conn);
1258 /* I'm racing with ksocknal_recv() */
1259 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1260 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1262 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1265 /* ksocknal_recv() got called */
1268 case SOCKNAL_RX_LNET_PAYLOAD:
1269 /* payload all received */
1272 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1273 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1274 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1275 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1276 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1277 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1281 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1282 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1284 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1285 id = &conn->ksnc_peer->ksnp_id;
1287 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1288 conn->ksnc_msg.ksm_zc_cookies[0],
1289 *ksocknal_tunables.ksnd_nonblk_zcack ||
1290 le64_to_cpu(lhdr->src_nid) != id->nid);
1293 lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
1296 ksocknal_new_packet(conn, 0);
1297 ksocknal_close_conn_and_siblings (conn, rc);
1302 case SOCKNAL_RX_SLOP:
1303 /* starting new packet? */
1304 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1305 return 0; /* come back later */
1306 goto again; /* try to finish reading slop now */
1314 return -EINVAL; /* keep gcc happy */
1318 ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
1319 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1320 unsigned int offset, unsigned int mlen, unsigned int rlen)
1322 ksock_conn_t *conn = (ksock_conn_t *)private;
1323 ksock_sched_t *sched = conn->ksnc_scheduler;
1325 LASSERT (mlen <= rlen);
1326 LASSERT (niov <= LNET_MAX_IOV);
1328 conn->ksnc_cookie = msg;
1329 conn->ksnc_rx_nob_wanted = mlen;
1330 conn->ksnc_rx_nob_left = rlen;
1332 if (mlen == 0 || iov != NULL) {
1333 conn->ksnc_rx_nkiov = 0;
1334 conn->ksnc_rx_kiov = NULL;
1335 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1336 conn->ksnc_rx_niov =
1337 lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
1338 niov, iov, offset, mlen);
1340 conn->ksnc_rx_niov = 0;
1341 conn->ksnc_rx_iov = NULL;
1342 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1343 conn->ksnc_rx_nkiov =
1344 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1345 niov, kiov, offset, mlen);
1349 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1350 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1352 LASSERT (conn->ksnc_rx_scheduled);
1354 spin_lock_bh(&sched->kss_lock);
1356 switch (conn->ksnc_rx_state) {
1357 case SOCKNAL_RX_PARSE_WAIT:
1358 list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1359 wake_up (&sched->kss_waitq);
1360 LASSERT (conn->ksnc_rx_ready);
1363 case SOCKNAL_RX_PARSE:
1364 /* scheduler hasn't noticed I'm parsing yet */
1368 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1370 spin_unlock_bh(&sched->kss_lock);
1371 ksocknal_conn_decref(conn);
1376 ksocknal_sched_cansleep(ksock_sched_t *sched)
1380 spin_lock_bh(&sched->kss_lock);
1382 rc = (!ksocknal_data.ksnd_shuttingdown &&
1383 list_empty(&sched->kss_rx_conns) &&
1384 list_empty(&sched->kss_tx_conns));
1386 spin_unlock_bh(&sched->kss_lock);
1390 int ksocknal_scheduler(void *arg)
1392 struct ksock_sched_info *info;
1393 ksock_sched_t *sched;
1398 long id = (long)arg;
1400 info = ksocknal_data.ksnd_sched_info[KSOCK_THREAD_CPT(id)];
1401 sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
1403 cfs_block_allsigs();
1405 rc = cfs_cpt_bind(lnet_cpt_table(), info->ksi_cpt);
1407 CERROR("Can't set CPT affinity to %d: %d\n",
1411 spin_lock_bh(&sched->kss_lock);
1413 while (!ksocknal_data.ksnd_shuttingdown) {
1414 int did_something = 0;
1416 /* Ensure I progress everything semi-fairly */
1418 if (!list_empty (&sched->kss_rx_conns)) {
1419 conn = list_entry(sched->kss_rx_conns.next,
1420 ksock_conn_t, ksnc_rx_list);
1421 list_del(&conn->ksnc_rx_list);
1423 LASSERT(conn->ksnc_rx_scheduled);
1424 LASSERT(conn->ksnc_rx_ready);
1426 /* clear rx_ready in case receive isn't complete.
1427 * Do it BEFORE we call process_recv, since
1428 * data_ready can set it any time after we release
1430 conn->ksnc_rx_ready = 0;
1431 spin_unlock_bh(&sched->kss_lock);
1433 rc = ksocknal_process_receive(conn);
1435 spin_lock_bh(&sched->kss_lock);
1437 /* I'm the only one that can clear this flag */
1438 LASSERT(conn->ksnc_rx_scheduled);
1440 /* Did process_receive get everything it wanted? */
1442 conn->ksnc_rx_ready = 1;
1444 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1445 /* Conn blocked waiting for ksocknal_recv()
1446 * I change its state (under lock) to signal
1447 * it can be rescheduled */
1448 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1449 } else if (conn->ksnc_rx_ready) {
1450 /* reschedule for rx */
1451 list_add_tail (&conn->ksnc_rx_list,
1452 &sched->kss_rx_conns);
1454 conn->ksnc_rx_scheduled = 0;
1456 ksocknal_conn_decref(conn);
1462 if (!list_empty (&sched->kss_tx_conns)) {
1465 if (!list_empty(&sched->kss_zombie_noop_txs)) {
1467 &sched->kss_zombie_noop_txs);
1468 list_del_init(&sched->kss_zombie_noop_txs);
1471 conn = list_entry(sched->kss_tx_conns.next,
1472 ksock_conn_t, ksnc_tx_list);
1473 list_del (&conn->ksnc_tx_list);
1475 LASSERT(conn->ksnc_tx_scheduled);
1476 LASSERT(conn->ksnc_tx_ready);
1477 LASSERT(!list_empty(&conn->ksnc_tx_queue));
1479 tx = list_entry(conn->ksnc_tx_queue.next,
1480 ksock_tx_t, tx_list);
1482 if (conn->ksnc_tx_carrier == tx)
1483 ksocknal_next_tx_carrier(conn);
1485 /* dequeue now so empty list => more to send */
1486 list_del(&tx->tx_list);
1488 /* Clear tx_ready in case send isn't complete. Do
1489 * it BEFORE we call process_transmit, since
1490 * write_space can set it any time after we release
1492 conn->ksnc_tx_ready = 0;
1493 spin_unlock_bh(&sched->kss_lock);
1495 if (!list_empty(&zlist)) {
1496 /* free zombie noop txs, it's fast because
1497 * noop txs are just put in freelist */
1498 ksocknal_txlist_done(NULL, &zlist, 0);
1501 rc = ksocknal_process_transmit(conn, tx);
1503 if (rc == -ENOMEM || rc == -EAGAIN) {
1504 /* Incomplete send: replace tx on HEAD of tx_queue */
1505 spin_lock_bh(&sched->kss_lock);
1506 list_add(&tx->tx_list,
1507 &conn->ksnc_tx_queue);
1509 /* Complete send; tx -ref */
1510 ksocknal_tx_decref(tx);
1512 spin_lock_bh(&sched->kss_lock);
1513 /* assume space for more */
1514 conn->ksnc_tx_ready = 1;
1517 if (rc == -ENOMEM) {
1518 /* Do nothing; after a short timeout, this
1519 * conn will be reposted on kss_tx_conns. */
1520 } else if (conn->ksnc_tx_ready &&
1521 !list_empty (&conn->ksnc_tx_queue)) {
1522 /* reschedule for tx */
1523 list_add_tail (&conn->ksnc_tx_list,
1524 &sched->kss_tx_conns);
1526 conn->ksnc_tx_scheduled = 0;
1528 ksocknal_conn_decref(conn);
1533 if (!did_something || /* nothing to do */
1534 ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
1535 spin_unlock_bh(&sched->kss_lock);
1539 if (!did_something) { /* wait for something to do */
1540 rc = wait_event_interruptible_exclusive(
1542 !ksocknal_sched_cansleep(sched));
1548 spin_lock_bh(&sched->kss_lock);
1552 spin_unlock_bh(&sched->kss_lock);
1553 ksocknal_thread_fini();
1558 * Add connection to kss_rx_conns of scheduler
1559 * and wakeup the scheduler.
1561 void ksocknal_read_callback (ksock_conn_t *conn)
1563 ksock_sched_t *sched;
1565 sched = conn->ksnc_scheduler;
1567 spin_lock_bh(&sched->kss_lock);
1569 conn->ksnc_rx_ready = 1;
1571 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1572 list_add_tail(&conn->ksnc_rx_list,
1573 &sched->kss_rx_conns);
1574 conn->ksnc_rx_scheduled = 1;
1575 /* extra ref for scheduler */
1576 ksocknal_conn_addref(conn);
1578 wake_up (&sched->kss_waitq);
1580 spin_unlock_bh(&sched->kss_lock);
1584 * Add connection to kss_tx_conns of scheduler
1585 * and wakeup the scheduler.
1587 void ksocknal_write_callback (ksock_conn_t *conn)
1589 ksock_sched_t *sched;
1591 sched = conn->ksnc_scheduler;
1593 spin_lock_bh(&sched->kss_lock);
1595 conn->ksnc_tx_ready = 1;
1597 if (!conn->ksnc_tx_scheduled && /* not being progressed */
1598 !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
1599 list_add_tail (&conn->ksnc_tx_list,
1600 &sched->kss_tx_conns);
1601 conn->ksnc_tx_scheduled = 1;
1602 /* extra ref for scheduler */
1603 ksocknal_conn_addref(conn);
1605 wake_up (&sched->kss_waitq);
1608 spin_unlock_bh(&sched->kss_lock);
1611 static ksock_proto_t *
1612 ksocknal_parse_proto_version (ksock_hello_msg_t *hello)
1616 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1617 version = hello->kshm_version;
1618 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1619 version = __swab32(hello->kshm_version);
1622 #if SOCKNAL_VERSION_DEBUG
1623 if (*ksocknal_tunables.ksnd_protocol == 1)
1626 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1627 version == KSOCK_PROTO_V3)
1630 if (version == KSOCK_PROTO_V2)
1631 return &ksocknal_protocol_v2x;
1633 if (version == KSOCK_PROTO_V3)
1634 return &ksocknal_protocol_v3x;
1639 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1640 lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
1642 CLASSERT (sizeof (lnet_magicversion_t) ==
1643 offsetof (ksock_hello_msg_t, kshm_src_nid));
1645 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1646 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1647 return &ksocknal_protocol_v1x;
1654 ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1655 lnet_nid_t peer_nid, ksock_hello_msg_t *hello)
1657 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1658 ksock_net_t *net = (ksock_net_t *)ni->ni_data;
1660 LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
1662 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1663 LASSERT (conn->ksnc_proto != NULL);
1665 hello->kshm_src_nid = ni->ni_nid;
1666 hello->kshm_dst_nid = peer_nid;
1667 hello->kshm_src_pid = the_lnet.ln_pid;
1669 hello->kshm_src_incarnation = net->ksnn_incarnation;
1670 hello->kshm_ctype = conn->ksnc_type;
1672 return conn->ksnc_proto->pro_send_hello(conn, hello);
1676 ksocknal_invert_type(int type)
1679 case SOCKLND_CONN_ANY:
1680 case SOCKLND_CONN_CONTROL:
1682 case SOCKLND_CONN_BULK_IN:
1683 return SOCKLND_CONN_BULK_OUT;
1684 case SOCKLND_CONN_BULK_OUT:
1685 return SOCKLND_CONN_BULK_IN;
1687 return SOCKLND_CONN_NONE;
1692 ksocknal_recv_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1693 ksock_hello_msg_t *hello, lnet_process_id_t *peerid,
1696 /* Return < 0 fatal error
1698 * EALREADY lost connection race
1699 * EPROTO protocol version mismatch
1701 struct socket *sock = conn->ksnc_sock;
1702 int active = (conn->ksnc_proto != NULL);
1706 ksock_proto_t *proto;
1707 lnet_process_id_t recv_id;
1709 /* socket type set on active connections - not set on passive */
1710 LASSERT (!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1712 timeout = active ? *ksocknal_tunables.ksnd_timeout :
1713 lnet_acceptor_timeout();
1715 rc = libcfs_sock_read(sock, &hello->kshm_magic, sizeof (hello->kshm_magic), timeout);
1717 CERROR("Error %d reading HELLO from %pI4h\n",
1718 rc, &conn->ksnc_ipaddr);
1723 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1724 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1725 hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1726 /* Unexpected magic! */
1727 CERROR("Bad magic(1) %#08x (%#08x expected) from "
1728 "%pI4h\n", __cpu_to_le32 (hello->kshm_magic),
1729 LNET_PROTO_TCP_MAGIC,
1730 &conn->ksnc_ipaddr);
1734 rc = libcfs_sock_read(sock, &hello->kshm_version,
1735 sizeof(hello->kshm_version), timeout);
1737 CERROR("Error %d reading HELLO from %pI4h\n",
1738 rc, &conn->ksnc_ipaddr);
1743 proto = ksocknal_parse_proto_version(hello);
1744 if (proto == NULL) {
1746 /* unknown protocol from peer, tell peer my protocol */
1747 conn->ksnc_proto = &ksocknal_protocol_v3x;
1748 #if SOCKNAL_VERSION_DEBUG
1749 if (*ksocknal_tunables.ksnd_protocol == 2)
1750 conn->ksnc_proto = &ksocknal_protocol_v2x;
1751 else if (*ksocknal_tunables.ksnd_protocol == 1)
1752 conn->ksnc_proto = &ksocknal_protocol_v1x;
1754 hello->kshm_nips = 0;
1755 ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1758 CERROR("Unknown protocol version (%d.x expected)"
1760 conn->ksnc_proto->pro_version,
1761 &conn->ksnc_ipaddr);
1766 proto_match = (conn->ksnc_proto == proto);
1767 conn->ksnc_proto = proto;
1769 /* receive the rest of hello message anyway */
1770 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1772 CERROR("Error %d reading or checking hello from from %pI4h\n",
1773 rc, &conn->ksnc_ipaddr);
1778 *incarnation = hello->kshm_src_incarnation;
1780 if (hello->kshm_src_nid == LNET_NID_ANY) {
1781 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY"
1782 "from %pI4h\n", &conn->ksnc_ipaddr);
1787 conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1788 /* Userspace NAL assigns peer process ID from socket */
1789 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1790 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1792 recv_id.nid = hello->kshm_src_nid;
1793 recv_id.pid = hello->kshm_src_pid;
1799 /* peer determines type */
1800 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1801 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1802 CERROR("Unexpected type %d from %s ip %pI4h\n",
1803 hello->kshm_ctype, libcfs_id2str(*peerid),
1804 &conn->ksnc_ipaddr);
1811 if (peerid->pid != recv_id.pid ||
1812 peerid->nid != recv_id.nid) {
1813 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1814 " %pI4h, but they claimed they were "
1815 "%s; please check your Lustre "
1817 libcfs_id2str(*peerid),
1819 libcfs_id2str(recv_id));
1823 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1824 /* Possible protocol mismatch or I lost the connection race */
1825 return proto_match ? EALREADY : EPROTO;
1828 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1829 CERROR("Mismatched types: me %d, %s ip %pI4h %d\n",
1830 conn->ksnc_type, libcfs_id2str(*peerid),
1840 ksocknal_connect (ksock_route_t *route)
1842 LIST_HEAD (zombies);
1843 ksock_peer_t *peer = route->ksnr_peer;
1846 struct socket *sock;
1847 unsigned long 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 #if 0 /* irrelevant with only eager routes */
1991 if (!route->ksnr_deleted) {
1992 /* make this route least-favourite for re-selection */
1993 list_del(&route->ksnr_list);
1994 list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
1997 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1999 ksocknal_peer_failed(peer);
2000 ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
2005 * check whether we need to create more connds.
2006 * It will try to create new thread if it's necessary, @timeout can
2007 * be updated if failed to create, so caller wouldn't keep try while
2008 * running out of resource.
2011 ksocknal_connd_check_start(long sec, long *timeout)
2015 int total = ksocknal_data.ksnd_connd_starting +
2016 ksocknal_data.ksnd_connd_running;
2018 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2019 /* still in initializing */
2023 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2024 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2025 /* can't create more connd, or still have enough
2026 * threads to handle more connecting */
2030 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2031 /* no pending connecting request */
2035 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2036 /* may run out of resource, retry later */
2037 *timeout = cfs_time_seconds(1);
2041 if (ksocknal_data.ksnd_connd_starting > 0) {
2042 /* serialize starting to avoid flood */
2046 ksocknal_data.ksnd_connd_starting_stamp = sec;
2047 ksocknal_data.ksnd_connd_starting++;
2048 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2050 /* NB: total is the next id */
2051 snprintf(name, sizeof(name), "socknal_cd%02d", total);
2052 rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
2054 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2059 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2060 ksocknal_data.ksnd_connd_starting--;
2061 ksocknal_data.ksnd_connd_failed_stamp = get_seconds();
2067 * check whether current thread can exit, it will return 1 if there are too
2068 * many threads and no creating in past 120 seconds.
2069 * Also, this function may update @timeout to make caller come back
2070 * again to recheck these conditions.
2073 ksocknal_connd_check_stop(long sec, long *timeout)
2077 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2078 /* still in initializing */
2082 if (ksocknal_data.ksnd_connd_starting > 0) {
2083 /* in progress of starting new thread */
2087 if (ksocknal_data.ksnd_connd_running <=
2088 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2092 /* created thread in past 120 seconds? */
2093 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2094 SOCKNAL_CONND_TIMEOUT - sec);
2096 *timeout = (val > 0) ? cfs_time_seconds(val) :
2097 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2101 /* no creating in past 120 seconds */
2103 return ksocknal_data.ksnd_connd_running >
2104 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2107 /* Go through connd_routes queue looking for a route that we can process
2108 * right now, @timeout_p can be updated if we need to come back later */
2109 static ksock_route_t *
2110 ksocknal_connd_get_route_locked(signed long *timeout_p)
2112 ksock_route_t *route;
2115 now = cfs_time_current();
2117 /* connd_routes can contain both pending and ordinary routes */
2118 list_for_each_entry (route, &ksocknal_data.ksnd_connd_routes,
2121 if (route->ksnr_retry_interval == 0 ||
2122 cfs_time_aftereq(now, route->ksnr_timeout))
2125 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2126 (int)*timeout_p > (int)(route->ksnr_timeout - now))
2127 *timeout_p = (int)(route->ksnr_timeout - now);
2134 ksocknal_connd (void *arg)
2136 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2137 ksock_connreq_t *cr;
2142 cfs_block_allsigs ();
2144 init_waitqueue_entry(&wait, current);
2146 spin_lock_bh(connd_lock);
2148 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2149 ksocknal_data.ksnd_connd_starting--;
2150 ksocknal_data.ksnd_connd_running++;
2152 while (!ksocknal_data.ksnd_shuttingdown) {
2153 ksock_route_t *route = NULL;
2154 long sec = get_seconds();
2155 long timeout = MAX_SCHEDULE_TIMEOUT;
2156 int dropped_lock = 0;
2158 if (ksocknal_connd_check_stop(sec, &timeout)) {
2159 /* wakeup another one to check stop */
2160 wake_up(&ksocknal_data.ksnd_connd_waitq);
2164 if (ksocknal_connd_check_start(sec, &timeout)) {
2165 /* created new thread */
2169 if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2170 /* Connection accepted by the listener */
2171 cr = list_entry(ksocknal_data.ksnd_connd_connreqs. \
2172 next, ksock_connreq_t, ksncr_list);
2174 list_del(&cr->ksncr_list);
2175 spin_unlock_bh(connd_lock);
2178 ksocknal_create_conn(cr->ksncr_ni, NULL,
2179 cr->ksncr_sock, SOCKLND_CONN_NONE);
2180 lnet_ni_decref(cr->ksncr_ni);
2181 LIBCFS_FREE(cr, sizeof(*cr));
2183 spin_lock_bh(connd_lock);
2186 /* Only handle an outgoing connection request if there
2187 * is a thread left to handle incoming connections and
2188 * create new connd */
2189 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2190 ksocknal_data.ksnd_connd_running) {
2191 route = ksocknal_connd_get_route_locked(&timeout);
2193 if (route != NULL) {
2194 list_del (&route->ksnr_connd_list);
2195 ksocknal_data.ksnd_connd_connecting++;
2196 spin_unlock_bh(connd_lock);
2199 if (ksocknal_connect(route)) {
2200 /* consecutive retry */
2201 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2202 CWARN("massive consecutive "
2203 "re-connecting to %pI4h\n",
2204 &route->ksnr_ipaddr);
2211 ksocknal_route_decref(route);
2213 spin_lock_bh(connd_lock);
2214 ksocknal_data.ksnd_connd_connecting--;
2218 if (++nloops < SOCKNAL_RESCHED)
2220 spin_unlock_bh(connd_lock);
2223 spin_lock_bh(connd_lock);
2227 /* Nothing to do for 'timeout' */
2228 set_current_state(TASK_INTERRUPTIBLE);
2229 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
2230 spin_unlock_bh(connd_lock);
2233 schedule_timeout(timeout);
2235 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2236 spin_lock_bh(connd_lock);
2238 ksocknal_data.ksnd_connd_running--;
2239 spin_unlock_bh(connd_lock);
2241 ksocknal_thread_fini();
2245 static ksock_conn_t *
2246 ksocknal_find_timed_out_conn (ksock_peer_t *peer)
2248 /* We're called with a shared lock on ksnd_global_lock */
2250 struct list_head *ctmp;
2252 list_for_each (ctmp, &peer->ksnp_conns) {
2254 conn = list_entry (ctmp, ksock_conn_t, ksnc_list);
2256 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2257 LASSERT (!conn->ksnc_closing);
2259 /* SOCK_ERROR will reset error code of socket in
2260 * some platform (like Darwin8.x) */
2261 error = conn->ksnc_sock->sk->sk_err;
2263 ksocknal_conn_addref(conn);
2267 CNETERR("A connection with %s "
2268 "(%pI4h:%d) was reset; "
2269 "it may have rebooted.\n",
2270 libcfs_id2str(peer->ksnp_id),
2275 CNETERR("A connection with %s "
2276 "(%pI4h:%d) timed out; the "
2277 "network or node may be down.\n",
2278 libcfs_id2str(peer->ksnp_id),
2283 CNETERR("An unexpected network error %d "
2285 "(%pI4h:%d\n", error,
2286 libcfs_id2str(peer->ksnp_id),
2295 if (conn->ksnc_rx_started &&
2296 cfs_time_aftereq(cfs_time_current(),
2297 conn->ksnc_rx_deadline)) {
2298 /* Timed out incomplete incoming message */
2299 ksocknal_conn_addref(conn);
2300 CNETERR("Timeout receiving from %s (%pI4h:%d), "
2301 "state %d wanted %d left %d\n",
2302 libcfs_id2str(peer->ksnp_id),
2305 conn->ksnc_rx_state,
2306 conn->ksnc_rx_nob_wanted,
2307 conn->ksnc_rx_nob_left);
2311 if ((!list_empty(&conn->ksnc_tx_queue) ||
2312 conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
2313 cfs_time_aftereq(cfs_time_current(),
2314 conn->ksnc_tx_deadline)) {
2315 /* Timed out messages queued for sending or
2316 * buffered in the socket's send buffer */
2317 ksocknal_conn_addref(conn);
2318 CNETERR("Timeout sending data to %s (%pI4h:%d) "
2319 "the network or that node may be down.\n",
2320 libcfs_id2str(peer->ksnp_id),
2331 ksocknal_flush_stale_txs(ksock_peer_t *peer)
2334 LIST_HEAD (stale_txs);
2336 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2338 while (!list_empty (&peer->ksnp_tx_queue)) {
2339 tx = list_entry (peer->ksnp_tx_queue.next,
2340 ksock_tx_t, tx_list);
2342 if (!cfs_time_aftereq(cfs_time_current(),
2346 list_del (&tx->tx_list);
2347 list_add_tail (&tx->tx_list, &stale_txs);
2350 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2352 ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
2356 ksocknal_send_keepalive_locked(ksock_peer_t *peer)
2358 ksock_sched_t *sched;
2362 if (list_empty(&peer->ksnp_conns)) /* last_alive will be updated by create_conn */
2365 if (peer->ksnp_proto != &ksocknal_protocol_v3x)
2368 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2369 time_before(cfs_time_current(),
2370 cfs_time_add(peer->ksnp_last_alive,
2371 cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
2374 if (time_before(cfs_time_current(), peer->ksnp_send_keepalive))
2377 /* retry 10 secs later, so we wouldn't put pressure
2378 * on this peer if we failed to send keepalive this time */
2379 peer->ksnp_send_keepalive = cfs_time_shift(10);
2381 conn = ksocknal_find_conn_locked(peer, NULL, 1);
2383 sched = conn->ksnc_scheduler;
2385 spin_lock_bh(&sched->kss_lock);
2386 if (!list_empty(&conn->ksnc_tx_queue)) {
2387 spin_unlock_bh(&sched->kss_lock);
2388 /* there is an queued ACK, don't need keepalive */
2392 spin_unlock_bh(&sched->kss_lock);
2395 read_unlock(&ksocknal_data.ksnd_global_lock);
2397 /* cookie = 1 is reserved for keepalive PING */
2398 tx = ksocknal_alloc_tx_noop(1, 1);
2400 read_lock(&ksocknal_data.ksnd_global_lock);
2404 if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) {
2405 read_lock(&ksocknal_data.ksnd_global_lock);
2409 ksocknal_free_tx(tx);
2410 read_lock(&ksocknal_data.ksnd_global_lock);
2417 ksocknal_check_peer_timeouts (int idx)
2419 struct list_head *peers = &ksocknal_data.ksnd_peers[idx];
2425 /* NB. We expect to have a look at all the peers and not find any
2426 * connections to time out, so we just use a shared lock while we
2428 read_lock(&ksocknal_data.ksnd_global_lock);
2430 list_for_each_entry(peer, peers, ksnp_list) {
2431 unsigned long 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))
2477 spin_lock(&peer->ksnp_lock);
2478 list_for_each_entry(tx, &peer->ksnp_zc_req_list, tx_zc_list) {
2479 if (!cfs_time_aftereq(cfs_time_current(),
2482 /* ignore the TX if connection is being closed */
2483 if (tx->tx_conn->ksnc_closing)
2489 spin_unlock(&peer->ksnp_lock);
2493 tx = list_entry(peer->ksnp_zc_req_list.next,
2494 ksock_tx_t, tx_zc_list);
2495 deadline = tx->tx_deadline;
2496 resid = tx->tx_resid;
2498 ksocknal_conn_addref(conn);
2500 spin_unlock(&peer->ksnp_lock);
2501 read_unlock(&ksocknal_data.ksnd_global_lock);
2503 CERROR("Total %d stale ZC_REQs for peer %s detected; the "
2504 "oldest(%p) timed out %ld secs ago, "
2505 "resid: %d, wmem: %d\n",
2506 n, libcfs_nid2str(peer->ksnp_id.nid), tx,
2507 cfs_duration_sec(cfs_time_current() - deadline),
2508 resid, conn->ksnc_sock->sk->sk_wmem_queued);
2510 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2511 ksocknal_conn_decref(conn);
2515 read_unlock(&ksocknal_data.ksnd_global_lock);
2519 ksocknal_reaper (void *arg)
2523 ksock_sched_t *sched;
2524 struct list_head enomem_conns;
2529 unsigned long 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();