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 (!cfs_list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
41 tx = cfs_list_entry(ksocknal_data.ksnd_idle_noop_txs. \
42 next, ksock_tx_t, tx_list);
43 LASSERT(tx->tx_desc_size == size);
44 cfs_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 cfs_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 cfs_pause(cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
195 LASSERT (tx->tx_resid != 0);
197 rc = ksocknal_connsock_addref(conn);
199 LASSERT (conn->ksnc_closing);
204 if (ksocknal_data.ksnd_enomem_tx > 0) {
206 ksocknal_data.ksnd_enomem_tx--;
208 } else if (tx->tx_niov != 0) {
209 rc = ksocknal_send_iov (conn, tx);
211 rc = ksocknal_send_kiov (conn, tx);
214 bufnob = libcfs_sock_wmem_queued(conn->ksnc_sock);
215 if (rc > 0) /* sent something? */
216 conn->ksnc_tx_bufnob += rc; /* account it */
218 if (bufnob < conn->ksnc_tx_bufnob) {
219 /* allocated send buffer bytes < computed; infer
220 * something got ACKed */
221 conn->ksnc_tx_deadline =
222 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
223 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
224 conn->ksnc_tx_bufnob = bufnob;
228 if (rc <= 0) { /* Didn't write anything? */
230 if (rc == 0) /* some stacks return 0 instead of -EAGAIN */
233 /* Check if EAGAIN is due to memory pressure */
234 if(rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
240 /* socket's wmem_queued now includes 'rc' bytes */
241 atomic_sub (rc, &conn->ksnc_tx_nob);
244 } while (tx->tx_resid != 0);
246 ksocknal_connsock_decref(conn);
251 ksocknal_recv_iov (ksock_conn_t *conn)
253 struct iovec *iov = conn->ksnc_rx_iov;
257 LASSERT (conn->ksnc_rx_niov > 0);
259 /* Never touch conn->ksnc_rx_iov or change connection
260 * status inside ksocknal_lib_recv_iov */
261 rc = ksocknal_lib_recv_iov(conn);
266 /* received something... */
269 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
270 conn->ksnc_rx_deadline =
271 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
272 smp_mb(); /* order with setting rx_started */
273 conn->ksnc_rx_started = 1;
275 conn->ksnc_rx_nob_wanted -= nob;
276 conn->ksnc_rx_nob_left -= nob;
279 LASSERT (conn->ksnc_rx_niov > 0);
281 if (nob < (int)iov->iov_len) {
283 iov->iov_base = (void *)((char *)iov->iov_base + nob);
288 conn->ksnc_rx_iov = ++iov;
289 conn->ksnc_rx_niov--;
296 ksocknal_recv_kiov (ksock_conn_t *conn)
298 lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
301 LASSERT (conn->ksnc_rx_nkiov > 0);
303 /* Never touch conn->ksnc_rx_kiov or change connection
304 * status inside ksocknal_lib_recv_iov */
305 rc = ksocknal_lib_recv_kiov(conn);
310 /* received something... */
313 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
314 conn->ksnc_rx_deadline =
315 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
316 smp_mb(); /* order with setting rx_started */
317 conn->ksnc_rx_started = 1;
319 conn->ksnc_rx_nob_wanted -= nob;
320 conn->ksnc_rx_nob_left -= nob;
323 LASSERT (conn->ksnc_rx_nkiov > 0);
325 if (nob < (int) kiov->kiov_len) {
326 kiov->kiov_offset += nob;
327 kiov->kiov_len -= nob;
331 nob -= kiov->kiov_len;
332 conn->ksnc_rx_kiov = ++kiov;
333 conn->ksnc_rx_nkiov--;
340 ksocknal_receive (ksock_conn_t *conn)
342 /* Return 1 on success, 0 on EOF, < 0 on error.
343 * Caller checks ksnc_rx_nob_wanted to determine
344 * progress/completion. */
348 if (ksocknal_data.ksnd_stall_rx != 0) {
349 cfs_pause(cfs_time_seconds (ksocknal_data.ksnd_stall_rx));
352 rc = ksocknal_connsock_addref(conn);
354 LASSERT (conn->ksnc_closing);
359 if (conn->ksnc_rx_niov != 0)
360 rc = ksocknal_recv_iov (conn);
362 rc = ksocknal_recv_kiov (conn);
365 /* error/EOF or partial receive */
368 } else if (rc == 0 && conn->ksnc_rx_started) {
369 /* EOF in the middle of a message */
375 /* Completed a fragment */
377 if (conn->ksnc_rx_nob_wanted == 0) {
383 ksocknal_connsock_decref(conn);
388 ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
390 lnet_msg_t *lnetmsg = tx->tx_lnetmsg;
391 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);
410 ksocknal_txlist_done (lnet_ni_t *ni, cfs_list_t *txlist, int error)
414 while (!cfs_list_empty (txlist)) {
415 tx = cfs_list_entry (txlist->next, ksock_tx_t, tx_list);
417 if (error && tx->tx_lnetmsg != NULL) {
418 CNETERR("Deleting packet type %d len %d %s->%s\n",
419 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
420 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
421 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
422 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
424 CNETERR("Deleting noop packet\n");
427 cfs_list_del (&tx->tx_list);
429 LASSERT (atomic_read(&tx->tx_refcount) == 1);
430 ksocknal_tx_done (ni, tx);
435 ksocknal_check_zc_req(ksock_tx_t *tx)
437 ksock_conn_t *conn = tx->tx_conn;
438 ksock_peer_t *peer = conn->ksnc_peer;
440 /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
441 * to ksnp_zc_req_list if some fragment of this message should be sent
442 * zero-copy. Our peer will send an ACK containing this cookie when
443 * she has received this message to tell us we can signal completion.
444 * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
445 * ksnp_zc_req_list. */
446 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
447 LASSERT (tx->tx_zc_capable);
449 tx->tx_zc_checked = 1;
451 if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
452 !conn->ksnc_zc_capable)
455 /* assign cookie and queue tx to pending list, it will be released when
456 * a matching ack is received. See ksocknal_handle_zcack() */
458 ksocknal_tx_addref(tx);
460 spin_lock(&peer->ksnp_lock);
462 /* ZC_REQ is going to be pinned to the peer */
464 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
466 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
468 tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
470 if (peer->ksnp_zc_next_cookie == 0)
471 peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
473 cfs_list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
475 spin_unlock(&peer->ksnp_lock);
479 ksocknal_uncheck_zc_req(ksock_tx_t *tx)
481 ksock_peer_t *peer = tx->tx_conn->ksnc_peer;
483 LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
484 LASSERT(tx->tx_zc_capable);
486 tx->tx_zc_checked = 0;
488 spin_lock(&peer->ksnp_lock);
490 if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
491 /* Not waiting for an ACK */
492 spin_unlock(&peer->ksnp_lock);
496 tx->tx_msg.ksm_zc_cookies[0] = 0;
497 cfs_list_del(&tx->tx_zc_list);
499 spin_unlock(&peer->ksnp_lock);
501 ksocknal_tx_decref(tx);
505 ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
509 if (tx->tx_zc_capable && !tx->tx_zc_checked)
510 ksocknal_check_zc_req(tx);
512 rc = ksocknal_transmit (conn, tx);
514 CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc);
516 if (tx->tx_resid == 0) {
517 /* Sent everything OK */
529 counter++; /* exponential backoff warnings */
530 if ((counter & (-counter)) == counter)
531 CWARN("%u ENOMEM tx %p (%u allocated)\n",
532 counter, conn, atomic_read(&libcfs_kmemory));
534 /* Queue on ksnd_enomem_conns for retry after a timeout */
535 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
537 /* enomem list takes over scheduler's ref... */
538 LASSERT (conn->ksnc_tx_scheduled);
539 cfs_list_add_tail(&conn->ksnc_tx_list,
540 &ksocknal_data.ksnd_enomem_conns);
541 if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
542 SOCKNAL_ENOMEM_RETRY),
543 ksocknal_data.ksnd_reaper_waketime))
544 wake_up(&ksocknal_data.ksnd_reaper_waitq);
546 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
553 if (!conn->ksnc_closing) {
556 LCONSOLE_WARN("Host %u.%u.%u.%u reset our connection "
557 "while we were sending data; it may have "
559 HIPQUAD(conn->ksnc_ipaddr));
562 LCONSOLE_WARN("There was an unexpected network error "
563 "while writing to %u.%u.%u.%u: %d.\n",
564 HIPQUAD(conn->ksnc_ipaddr), rc);
567 CDEBUG(D_NET, "[%p] Error %d on write to %s"
568 " ip %d.%d.%d.%d:%d\n", conn, rc,
569 libcfs_id2str(conn->ksnc_peer->ksnp_id),
570 HIPQUAD(conn->ksnc_ipaddr),
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 cfs_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)
627 ksock_conn_t *typed = NULL;
628 ksock_conn_t *fallback = NULL;
632 cfs_list_for_each (tmp, &peer->ksnp_conns) {
633 ksock_conn_t *c = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
634 int nob = atomic_read(&c->ksnc_tx_nob) +
635 libcfs_sock_wmem_queued(c->ksnc_sock);
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 %d.%d.%d.%d:%d\n",
704 libcfs_id2str(conn->ksnc_peer->ksnp_id),
705 HIPQUAD(conn->ksnc_ipaddr),
708 ksocknal_tx_prep(conn, tx);
710 /* Ensure the frags we've been given EXACTLY match the number of
711 * bytes we want to send. Many TCP/IP stacks disregard any total
712 * size parameters passed to them and just look at the frags.
714 * We always expect at least 1 mapped fragment containing the
715 * complete ksocknal message header. */
716 LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
717 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
718 (unsigned int)tx->tx_nob);
719 LASSERT (tx->tx_niov >= 1);
720 LASSERT (tx->tx_resid == tx->tx_nob);
722 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
723 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
725 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
728 * FIXME: SOCK_WMEM_QUEUED and SOCK_ERROR could block in __DARWIN8__
729 * but they're used inside spinlocks a lot.
731 bufnob = libcfs_sock_wmem_queued(conn->ksnc_sock);
732 spin_lock_bh(&sched->kss_lock);
734 if (cfs_list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
735 /* First packet starts the timeout */
736 conn->ksnc_tx_deadline =
737 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
738 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
739 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
740 conn->ksnc_tx_bufnob = 0;
741 smp_mb(); /* order with adding to tx_queue */
744 if (msg->ksm_type == KSOCK_MSG_NOOP) {
745 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
746 * on a normal packet so I don't need to send it */
747 LASSERT (msg->ksm_zc_cookies[1] != 0);
748 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
750 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
751 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
754 /* It's a normal packet - can it piggback a noop zc-ack that
755 * has been queued already? */
756 LASSERT (msg->ksm_zc_cookies[1] == 0);
757 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
759 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
760 /* ztx will be released later */
764 atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
765 cfs_list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
768 if (conn->ksnc_tx_ready && /* able to send */
769 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
770 /* +1 ref for scheduler */
771 ksocknal_conn_addref(conn);
772 cfs_list_add_tail (&conn->ksnc_tx_list,
773 &sched->kss_tx_conns);
774 conn->ksnc_tx_scheduled = 1;
775 wake_up(&sched->kss_waitq);
778 spin_unlock_bh(&sched->kss_lock);
783 ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
785 cfs_time_t now = cfs_time_current();
787 ksock_route_t *route;
789 cfs_list_for_each (tmp, &peer->ksnp_routes) {
790 route = cfs_list_entry (tmp, ksock_route_t, ksnr_list);
792 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
794 if (route->ksnr_scheduled) /* connections being established */
797 /* all route types connected ? */
798 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
801 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
802 cfs_time_aftereq(now, route->ksnr_timeout))) {
804 "Too soon to retry route %u.%u.%u.%u "
805 "(cnted %d, interval %ld, %ld secs later)\n",
806 HIPQUAD(route->ksnr_ipaddr),
807 route->ksnr_connected,
808 route->ksnr_retry_interval,
809 cfs_duration_sec(route->ksnr_timeout - now));
820 ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
823 ksock_route_t *route;
825 cfs_list_for_each (tmp, &peer->ksnp_routes) {
826 route = cfs_list_entry (tmp, ksock_route_t, ksnr_list);
828 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
830 if (route->ksnr_scheduled)
838 ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
846 LASSERT (tx->tx_conn == NULL);
848 g_lock = &ksocknal_data.ksnd_global_lock;
850 for (retry = 0;; retry = 1) {
852 peer = ksocknal_find_peer_locked(ni, id);
854 if (ksocknal_find_connectable_route_locked(peer) == NULL) {
855 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
857 /* I've got no routes that need to be
858 * connecting and I do have an actual
860 ksocknal_queue_tx_locked (tx, conn);
867 /* I'll need a write lock... */
870 write_lock_bh(g_lock);
872 peer = ksocknal_find_peer_locked(ni, id);
876 write_unlock_bh(g_lock);
878 if ((id.pid & LNET_PID_USERFLAG) != 0) {
879 CERROR("Refusing to create a connection to "
880 "userspace process %s\n", libcfs_id2str(id));
881 return -EHOSTUNREACH;
885 CERROR("Can't find peer %s\n", libcfs_id2str(id));
886 return -EHOSTUNREACH;
889 rc = ksocknal_add_peer(ni, id,
890 LNET_NIDADDR(id.nid),
891 lnet_acceptor_port());
893 CERROR("Can't add peer %s: %d\n",
894 libcfs_id2str(id), rc);
899 ksocknal_launch_all_connections_locked(peer);
901 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
903 /* Connection exists; queue message on it */
904 ksocknal_queue_tx_locked (tx, conn);
905 write_unlock_bh(g_lock);
909 if (peer->ksnp_accepting > 0 ||
910 ksocknal_find_connecting_route_locked (peer) != NULL) {
911 /* the message is going to be pinned to the peer */
913 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
915 /* Queue the message until a connection is established */
916 cfs_list_add_tail (&tx->tx_list, &peer->ksnp_tx_queue);
917 write_unlock_bh(g_lock);
921 write_unlock_bh(g_lock);
923 /* NB Routes may be ignored if connections to them failed recently */
924 CNETERR("No usable routes to %s\n", libcfs_id2str(id));
925 return (-EHOSTUNREACH);
929 ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
932 int type = lntmsg->msg_type;
933 lnet_process_id_t target = lntmsg->msg_target;
934 unsigned int payload_niov = lntmsg->msg_niov;
935 struct iovec *payload_iov = lntmsg->msg_iov;
936 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
937 unsigned int payload_offset = lntmsg->msg_offset;
938 unsigned int payload_nob = lntmsg->msg_len;
943 /* NB 'private' is different depending on what we're sending.
944 * Just ignore it... */
946 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
947 payload_nob, payload_niov, libcfs_id2str(target));
949 LASSERT (payload_nob == 0 || payload_niov > 0);
950 LASSERT (payload_niov <= LNET_MAX_IOV);
951 /* payload is either all vaddrs or all pages */
952 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
953 LASSERT (!in_interrupt ());
955 if (payload_iov != NULL)
956 desc_size = offsetof(ksock_tx_t,
957 tx_frags.virt.iov[1 + payload_niov]);
959 desc_size = offsetof(ksock_tx_t,
960 tx_frags.paged.kiov[payload_niov]);
962 if (lntmsg->msg_vmflush)
963 mpflag = cfs_memory_pressure_get_and_set();
964 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
966 CERROR("Can't allocate tx desc type %d size %d\n",
968 if (lntmsg->msg_vmflush)
969 cfs_memory_pressure_restore(mpflag);
973 tx->tx_conn = NULL; /* set when assigned a conn */
974 tx->tx_lnetmsg = lntmsg;
976 if (payload_iov != NULL) {
979 tx->tx_iov = tx->tx_frags.virt.iov;
981 lnet_extract_iov(payload_niov, &tx->tx_iov[1],
982 payload_niov, payload_iov,
983 payload_offset, payload_nob);
986 tx->tx_iov = &tx->tx_frags.paged.iov;
987 tx->tx_kiov = tx->tx_frags.paged.kiov;
988 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
989 payload_niov, payload_kiov,
990 payload_offset, payload_nob);
992 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
993 tx->tx_zc_capable = 1;
996 socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_LNET);
998 /* The first fragment will be set later in pro_pack */
999 rc = ksocknal_launch_packet(ni, tx, target);
1000 if (lntmsg->msg_vmflush)
1001 cfs_memory_pressure_restore(mpflag);
1005 ksocknal_free_tx(tx);
1010 ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
1012 struct task_struct *task = kthread_run(fn, arg, name);
1015 return PTR_ERR(task);
1017 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1018 ksocknal_data.ksnd_nthreads++;
1019 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1024 ksocknal_thread_fini (void)
1026 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1027 ksocknal_data.ksnd_nthreads--;
1028 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1032 ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
1034 static char ksocknal_slop_buffer[4096];
1040 LASSERT(conn->ksnc_proto != NULL);
1042 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1043 /* Remind the socket to ack eagerly... */
1044 ksocknal_lib_eager_ack(conn);
1047 if (nob_to_skip == 0) { /* right at next packet boundary now */
1048 conn->ksnc_rx_started = 0;
1049 smp_mb(); /* racing with timeout thread */
1051 switch (conn->ksnc_proto->pro_version) {
1052 case KSOCK_PROTO_V2:
1053 case KSOCK_PROTO_V3:
1054 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1055 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1056 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1058 conn->ksnc_rx_nob_wanted = offsetof(ksock_msg_t, ksm_u);
1059 conn->ksnc_rx_nob_left = offsetof(ksock_msg_t, ksm_u);
1060 conn->ksnc_rx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u);
1063 case KSOCK_PROTO_V1:
1064 /* Receiving bare lnet_hdr_t */
1065 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1066 conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
1067 conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
1069 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1070 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1071 conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t);
1077 conn->ksnc_rx_niov = 1;
1079 conn->ksnc_rx_kiov = NULL;
1080 conn->ksnc_rx_nkiov = 0;
1081 conn->ksnc_rx_csum = ~0;
1085 /* Set up to skip as much as possible now. If there's more left
1086 * (ran out of iov entries) we'll get called again */
1088 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1089 conn->ksnc_rx_nob_left = nob_to_skip;
1090 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1095 nob = MIN (nob_to_skip, sizeof (ksocknal_slop_buffer));
1097 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1098 conn->ksnc_rx_iov[niov].iov_len = nob;
1103 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1104 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof (struct iovec));
1106 conn->ksnc_rx_niov = niov;
1107 conn->ksnc_rx_kiov = NULL;
1108 conn->ksnc_rx_nkiov = 0;
1109 conn->ksnc_rx_nob_wanted = skipped;
1114 ksocknal_process_receive (ksock_conn_t *conn)
1117 lnet_process_id_t *id;
1120 LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
1122 /* NB: sched lock NOT held */
1123 /* SOCKNAL_RX_LNET_HEADER is here for backward compatability */
1124 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1125 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1126 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1127 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1129 if (conn->ksnc_rx_nob_wanted != 0) {
1130 rc = ksocknal_receive(conn);
1133 LASSERT (rc != -EAGAIN);
1136 CDEBUG (D_NET, "[%p] EOF from %s"
1137 " ip %d.%d.%d.%d:%d\n", conn,
1138 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1139 HIPQUAD(conn->ksnc_ipaddr),
1141 else if (!conn->ksnc_closing)
1142 CERROR ("[%p] Error %d on read from %s"
1143 " ip %d.%d.%d.%d:%d\n",
1145 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1146 HIPQUAD(conn->ksnc_ipaddr),
1149 /* it's not an error if conn is being closed */
1150 ksocknal_close_conn_and_siblings (conn,
1151 (conn->ksnc_closing) ? 0 : rc);
1152 return (rc == 0 ? -ESHUTDOWN : rc);
1155 if (conn->ksnc_rx_nob_wanted != 0) {
1160 switch (conn->ksnc_rx_state) {
1161 case SOCKNAL_RX_KSM_HEADER:
1162 if (conn->ksnc_flip) {
1163 __swab32s(&conn->ksnc_msg.ksm_type);
1164 __swab32s(&conn->ksnc_msg.ksm_csum);
1165 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1166 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1169 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1170 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1171 CERROR("%s: Unknown message type: %x\n",
1172 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1173 conn->ksnc_msg.ksm_type);
1174 ksocknal_new_packet(conn, 0);
1175 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1179 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1180 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1181 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1182 /* NOOP Checksum error */
1183 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1184 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1185 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1186 ksocknal_new_packet(conn, 0);
1187 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1191 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1194 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1196 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1197 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1199 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1200 conn->ksnc_msg.ksm_zc_cookies[1]);
1203 CERROR("%s: Unknown ZC-ACK cookie: "LPU64", "LPU64"\n",
1204 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1205 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1206 ksocknal_new_packet(conn, 0);
1207 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1212 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1213 ksocknal_new_packet (conn, 0);
1214 return 0; /* NOOP is done and just return */
1217 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1218 conn->ksnc_rx_nob_wanted = sizeof(ksock_lnet_msg_t);
1219 conn->ksnc_rx_nob_left = sizeof(ksock_lnet_msg_t);
1221 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1222 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1223 conn->ksnc_rx_iov[0].iov_len = sizeof(ksock_lnet_msg_t);
1225 conn->ksnc_rx_niov = 1;
1226 conn->ksnc_rx_kiov = NULL;
1227 conn->ksnc_rx_nkiov = 0;
1229 goto again; /* read lnet header now */
1231 case SOCKNAL_RX_LNET_HEADER:
1232 /* unpack message header */
1233 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1235 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1236 /* Userspace peer */
1237 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1238 id = &conn->ksnc_peer->ksnp_id;
1240 /* Substitute process ID assigned at connection time */
1241 lhdr->src_pid = cpu_to_le32(id->pid);
1242 lhdr->src_nid = cpu_to_le64(id->nid);
1245 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1246 ksocknal_conn_addref(conn); /* ++ref while parsing */
1248 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1249 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1250 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1252 /* I just received garbage: give up on this conn */
1253 ksocknal_new_packet(conn, 0);
1254 ksocknal_close_conn_and_siblings (conn, rc);
1255 ksocknal_conn_decref(conn);
1259 /* I'm racing with ksocknal_recv() */
1260 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1261 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1263 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1266 /* ksocknal_recv() got called */
1269 case SOCKNAL_RX_LNET_PAYLOAD:
1270 /* payload all received */
1273 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1274 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1275 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1276 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1277 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1278 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1282 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1283 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1285 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1286 id = &conn->ksnc_peer->ksnp_id;
1288 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1289 conn->ksnc_msg.ksm_zc_cookies[0],
1290 *ksocknal_tunables.ksnd_nonblk_zcack ||
1291 le64_to_cpu(lhdr->src_nid) != id->nid);
1294 lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
1297 ksocknal_new_packet(conn, 0);
1298 ksocknal_close_conn_and_siblings (conn, rc);
1303 case SOCKNAL_RX_SLOP:
1304 /* starting new packet? */
1305 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1306 return 0; /* come back later */
1307 goto again; /* try to finish reading slop now */
1315 return (-EINVAL); /* keep gcc happy */
1319 ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
1320 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1321 unsigned int offset, unsigned int mlen, unsigned int rlen)
1323 ksock_conn_t *conn = (ksock_conn_t *)private;
1324 ksock_sched_t *sched = conn->ksnc_scheduler;
1326 LASSERT (mlen <= rlen);
1327 LASSERT (niov <= LNET_MAX_IOV);
1329 conn->ksnc_cookie = msg;
1330 conn->ksnc_rx_nob_wanted = mlen;
1331 conn->ksnc_rx_nob_left = rlen;
1333 if (mlen == 0 || iov != NULL) {
1334 conn->ksnc_rx_nkiov = 0;
1335 conn->ksnc_rx_kiov = NULL;
1336 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1337 conn->ksnc_rx_niov =
1338 lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
1339 niov, iov, offset, mlen);
1341 conn->ksnc_rx_niov = 0;
1342 conn->ksnc_rx_iov = NULL;
1343 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1344 conn->ksnc_rx_nkiov =
1345 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1346 niov, kiov, offset, mlen);
1350 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1351 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1353 LASSERT (conn->ksnc_rx_scheduled);
1355 spin_lock_bh(&sched->kss_lock);
1357 switch (conn->ksnc_rx_state) {
1358 case SOCKNAL_RX_PARSE_WAIT:
1359 cfs_list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1360 wake_up(&sched->kss_waitq);
1361 LASSERT(conn->ksnc_rx_ready);
1364 case SOCKNAL_RX_PARSE:
1365 /* scheduler hasn't noticed I'm parsing yet */
1369 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1371 spin_unlock_bh(&sched->kss_lock);
1372 ksocknal_conn_decref(conn);
1377 ksocknal_sched_cansleep(ksock_sched_t *sched)
1381 spin_lock_bh(&sched->kss_lock);
1383 rc = (!ksocknal_data.ksnd_shuttingdown &&
1384 cfs_list_empty(&sched->kss_rx_conns) &&
1385 cfs_list_empty(&sched->kss_tx_conns));
1387 spin_unlock_bh(&sched->kss_lock);
1391 int ksocknal_scheduler(void *arg)
1393 struct ksock_sched_info *info;
1394 ksock_sched_t *sched;
1399 long id = (long)arg;
1401 info = ksocknal_data.ksnd_sched_info[KSOCK_THREAD_CPT(id)];
1402 sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
1404 cfs_block_allsigs();
1406 rc = cfs_cpt_bind(lnet_cpt_table(), info->ksi_cpt);
1408 CERROR("Can't set CPT affinity to %d: %d\n",
1412 spin_lock_bh(&sched->kss_lock);
1414 while (!ksocknal_data.ksnd_shuttingdown) {
1415 int did_something = 0;
1417 /* Ensure I progress everything semi-fairly */
1419 if (!cfs_list_empty (&sched->kss_rx_conns)) {
1420 conn = cfs_list_entry(sched->kss_rx_conns.next,
1421 ksock_conn_t, ksnc_rx_list);
1422 cfs_list_del(&conn->ksnc_rx_list);
1424 LASSERT(conn->ksnc_rx_scheduled);
1425 LASSERT(conn->ksnc_rx_ready);
1427 /* clear rx_ready in case receive isn't complete.
1428 * Do it BEFORE we call process_recv, since
1429 * data_ready can set it any time after we release
1431 conn->ksnc_rx_ready = 0;
1432 spin_unlock_bh(&sched->kss_lock);
1434 rc = ksocknal_process_receive(conn);
1436 spin_lock_bh(&sched->kss_lock);
1438 /* I'm the only one that can clear this flag */
1439 LASSERT(conn->ksnc_rx_scheduled);
1441 /* Did process_receive get everything it wanted? */
1443 conn->ksnc_rx_ready = 1;
1445 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1446 /* Conn blocked waiting for ksocknal_recv()
1447 * I change its state (under lock) to signal
1448 * it can be rescheduled */
1449 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1450 } else if (conn->ksnc_rx_ready) {
1451 /* reschedule for rx */
1452 cfs_list_add_tail (&conn->ksnc_rx_list,
1453 &sched->kss_rx_conns);
1455 conn->ksnc_rx_scheduled = 0;
1457 ksocknal_conn_decref(conn);
1463 if (!cfs_list_empty (&sched->kss_tx_conns)) {
1464 CFS_LIST_HEAD (zlist);
1466 if (!cfs_list_empty(&sched->kss_zombie_noop_txs)) {
1467 cfs_list_add(&zlist,
1468 &sched->kss_zombie_noop_txs);
1469 cfs_list_del_init(&sched->kss_zombie_noop_txs);
1472 conn = cfs_list_entry(sched->kss_tx_conns.next,
1473 ksock_conn_t, ksnc_tx_list);
1474 cfs_list_del (&conn->ksnc_tx_list);
1476 LASSERT(conn->ksnc_tx_scheduled);
1477 LASSERT(conn->ksnc_tx_ready);
1478 LASSERT(!cfs_list_empty(&conn->ksnc_tx_queue));
1480 tx = cfs_list_entry(conn->ksnc_tx_queue.next,
1481 ksock_tx_t, tx_list);
1483 if (conn->ksnc_tx_carrier == tx)
1484 ksocknal_next_tx_carrier(conn);
1486 /* dequeue now so empty list => more to send */
1487 cfs_list_del(&tx->tx_list);
1489 /* Clear tx_ready in case send isn't complete. Do
1490 * it BEFORE we call process_transmit, since
1491 * write_space can set it any time after we release
1493 conn->ksnc_tx_ready = 0;
1494 spin_unlock_bh(&sched->kss_lock);
1496 if (!cfs_list_empty(&zlist)) {
1497 /* free zombie noop txs, it's fast because
1498 * noop txs are just put in freelist */
1499 ksocknal_txlist_done(NULL, &zlist, 0);
1502 rc = ksocknal_process_transmit(conn, tx);
1504 if (rc == -ENOMEM || rc == -EAGAIN) {
1505 /* Incomplete send: replace tx on HEAD of tx_queue */
1506 spin_lock_bh(&sched->kss_lock);
1507 cfs_list_add(&tx->tx_list,
1508 &conn->ksnc_tx_queue);
1510 /* Complete send; tx -ref */
1511 ksocknal_tx_decref(tx);
1513 spin_lock_bh(&sched->kss_lock);
1514 /* assume space for more */
1515 conn->ksnc_tx_ready = 1;
1518 if (rc == -ENOMEM) {
1519 /* Do nothing; after a short timeout, this
1520 * conn will be reposted on kss_tx_conns. */
1521 } else if (conn->ksnc_tx_ready &&
1522 !cfs_list_empty (&conn->ksnc_tx_queue)) {
1523 /* reschedule for tx */
1524 cfs_list_add_tail (&conn->ksnc_tx_list,
1525 &sched->kss_tx_conns);
1527 conn->ksnc_tx_scheduled = 0;
1529 ksocknal_conn_decref(conn);
1534 if (!did_something || /* nothing to do */
1535 ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
1536 spin_unlock_bh(&sched->kss_lock);
1540 if (!did_something) { /* wait for something to do */
1541 rc = wait_event_interruptible_exclusive(
1543 !ksocknal_sched_cansleep(sched));
1549 spin_lock_bh(&sched->kss_lock);
1553 spin_unlock_bh(&sched->kss_lock);
1554 ksocknal_thread_fini();
1559 * Add connection to kss_rx_conns of scheduler
1560 * and wakeup the scheduler.
1562 void ksocknal_read_callback (ksock_conn_t *conn)
1564 ksock_sched_t *sched;
1567 sched = conn->ksnc_scheduler;
1569 spin_lock_bh(&sched->kss_lock);
1571 conn->ksnc_rx_ready = 1;
1573 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1574 cfs_list_add_tail(&conn->ksnc_rx_list,
1575 &sched->kss_rx_conns);
1576 conn->ksnc_rx_scheduled = 1;
1577 /* extra ref for scheduler */
1578 ksocknal_conn_addref(conn);
1580 wake_up (&sched->kss_waitq);
1582 spin_unlock_bh(&sched->kss_lock);
1588 * Add connection to kss_tx_conns of scheduler
1589 * and wakeup the scheduler.
1591 void ksocknal_write_callback(ksock_conn_t *conn)
1593 ksock_sched_t *sched;
1596 sched = conn->ksnc_scheduler;
1598 spin_lock_bh(&sched->kss_lock);
1600 conn->ksnc_tx_ready = 1;
1602 if (!conn->ksnc_tx_scheduled && // not being progressed
1603 !cfs_list_empty(&conn->ksnc_tx_queue)){//packets to send
1604 cfs_list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
1605 conn->ksnc_tx_scheduled = 1;
1606 /* extra ref for scheduler */
1607 ksocknal_conn_addref(conn);
1609 wake_up(&sched->kss_waitq);
1612 spin_unlock_bh(&sched->kss_lock);
1618 ksocknal_parse_proto_version (ksock_hello_msg_t *hello)
1622 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1623 version = hello->kshm_version;
1624 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1625 version = __swab32(hello->kshm_version);
1628 #if SOCKNAL_VERSION_DEBUG
1629 if (*ksocknal_tunables.ksnd_protocol == 1)
1632 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1633 version == KSOCK_PROTO_V3)
1636 if (version == KSOCK_PROTO_V2)
1637 return &ksocknal_protocol_v2x;
1639 if (version == KSOCK_PROTO_V3)
1640 return &ksocknal_protocol_v3x;
1645 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1646 lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
1648 CLASSERT (sizeof (lnet_magicversion_t) ==
1649 offsetof (ksock_hello_msg_t, kshm_src_nid));
1651 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1652 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1653 return &ksocknal_protocol_v1x;
1660 ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1661 lnet_nid_t peer_nid, ksock_hello_msg_t *hello)
1663 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1664 ksock_net_t *net = (ksock_net_t *)ni->ni_data;
1666 LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
1668 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1669 LASSERT (conn->ksnc_proto != NULL);
1671 hello->kshm_src_nid = ni->ni_nid;
1672 hello->kshm_dst_nid = peer_nid;
1673 hello->kshm_src_pid = the_lnet.ln_pid;
1675 hello->kshm_src_incarnation = net->ksnn_incarnation;
1676 hello->kshm_ctype = conn->ksnc_type;
1678 return conn->ksnc_proto->pro_send_hello(conn, hello);
1682 ksocknal_invert_type(int type)
1686 case SOCKLND_CONN_ANY:
1687 case SOCKLND_CONN_CONTROL:
1689 case SOCKLND_CONN_BULK_IN:
1690 return SOCKLND_CONN_BULK_OUT;
1691 case SOCKLND_CONN_BULK_OUT:
1692 return SOCKLND_CONN_BULK_IN;
1694 return (SOCKLND_CONN_NONE);
1699 ksocknal_recv_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1700 ksock_hello_msg_t *hello, lnet_process_id_t *peerid,
1703 /* Return < 0 fatal error
1705 * EALREADY lost connection race
1706 * EPROTO protocol version mismatch
1708 cfs_socket_t *sock = conn->ksnc_sock;
1709 int active = (conn->ksnc_proto != NULL);
1713 ksock_proto_t *proto;
1714 lnet_process_id_t recv_id;
1716 /* socket type set on active connections - not set on passive */
1717 LASSERT (!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1719 timeout = active ? *ksocknal_tunables.ksnd_timeout :
1720 lnet_acceptor_timeout();
1722 rc = libcfs_sock_read(sock, &hello->kshm_magic, sizeof (hello->kshm_magic), timeout);
1724 CERROR ("Error %d reading HELLO from %u.%u.%u.%u\n",
1725 rc, HIPQUAD(conn->ksnc_ipaddr));
1730 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1731 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1732 hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1733 /* Unexpected magic! */
1734 CERROR ("Bad magic(1) %#08x (%#08x expected) from "
1735 "%u.%u.%u.%u\n", __cpu_to_le32 (hello->kshm_magic),
1736 LNET_PROTO_TCP_MAGIC,
1737 HIPQUAD(conn->ksnc_ipaddr));
1741 rc = libcfs_sock_read(sock, &hello->kshm_version,
1742 sizeof(hello->kshm_version), timeout);
1744 CERROR ("Error %d reading HELLO from %u.%u.%u.%u\n",
1745 rc, HIPQUAD(conn->ksnc_ipaddr));
1750 proto = ksocknal_parse_proto_version(hello);
1751 if (proto == NULL) {
1753 /* unknown protocol from peer, tell peer my protocol */
1754 conn->ksnc_proto = &ksocknal_protocol_v3x;
1755 #if SOCKNAL_VERSION_DEBUG
1756 if (*ksocknal_tunables.ksnd_protocol == 2)
1757 conn->ksnc_proto = &ksocknal_protocol_v2x;
1758 else if (*ksocknal_tunables.ksnd_protocol == 1)
1759 conn->ksnc_proto = &ksocknal_protocol_v1x;
1761 hello->kshm_nips = 0;
1762 ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1765 CERROR ("Unknown protocol version (%d.x expected)"
1766 " from %u.%u.%u.%u\n",
1767 conn->ksnc_proto->pro_version,
1768 HIPQUAD(conn->ksnc_ipaddr));
1773 proto_match = (conn->ksnc_proto == proto);
1774 conn->ksnc_proto = proto;
1776 /* receive the rest of hello message anyway */
1777 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1779 CERROR("Error %d reading or checking hello from from %u.%u.%u.%u\n",
1780 rc, HIPQUAD(conn->ksnc_ipaddr));
1785 *incarnation = hello->kshm_src_incarnation;
1787 if (hello->kshm_src_nid == LNET_NID_ANY) {
1788 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY"
1789 "from %u.%u.%u.%u\n", HIPQUAD(conn->ksnc_ipaddr));
1794 conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1795 /* Userspace NAL assigns peer process ID from socket */
1796 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1797 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1799 recv_id.nid = hello->kshm_src_nid;
1800 recv_id.pid = hello->kshm_src_pid;
1806 /* peer determines type */
1807 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1808 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1809 CERROR ("Unexpected type %d from %s ip %u.%u.%u.%u\n",
1810 hello->kshm_ctype, libcfs_id2str(*peerid),
1811 HIPQUAD(conn->ksnc_ipaddr));
1818 if (peerid->pid != recv_id.pid ||
1819 peerid->nid != recv_id.nid) {
1820 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1821 " %u.%u.%u.%u, but they claimed they were "
1822 "%s; please check your Lustre "
1824 libcfs_id2str(*peerid),
1825 HIPQUAD(conn->ksnc_ipaddr),
1826 libcfs_id2str(recv_id));
1830 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1831 /* Possible protocol mismatch or I lost the connection race */
1832 return proto_match ? EALREADY : EPROTO;
1835 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1836 CERROR ("Mismatched types: me %d, %s ip %u.%u.%u.%u %d\n",
1837 conn->ksnc_type, libcfs_id2str(*peerid),
1838 HIPQUAD(conn->ksnc_ipaddr),
1847 ksocknal_connect (ksock_route_t *route)
1849 CFS_LIST_HEAD (zombies);
1850 ksock_peer_t *peer = route->ksnr_peer;
1854 cfs_time_t deadline;
1855 int retry_later = 0;
1858 deadline = cfs_time_add(cfs_time_current(),
1859 cfs_time_seconds(*ksocknal_tunables.ksnd_timeout));
1861 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1863 LASSERT (route->ksnr_scheduled);
1864 LASSERT (!route->ksnr_connecting);
1866 route->ksnr_connecting = 1;
1869 wanted = ksocknal_route_mask() & ~route->ksnr_connected;
1871 /* stop connecting if peer/route got closed under me, or
1872 * route got connected while queued */
1873 if (peer->ksnp_closing || route->ksnr_deleted ||
1879 /* reschedule if peer is connecting to me */
1880 if (peer->ksnp_accepting > 0) {
1882 "peer %s(%d) already connecting to me, retry later.\n",
1883 libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting);
1887 if (retry_later) /* needs reschedule */
1890 if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) {
1891 type = SOCKLND_CONN_ANY;
1892 } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) {
1893 type = SOCKLND_CONN_CONTROL;
1894 } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) {
1895 type = SOCKLND_CONN_BULK_IN;
1897 LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0);
1898 type = SOCKLND_CONN_BULK_OUT;
1901 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1903 if (cfs_time_aftereq(cfs_time_current(), deadline)) {
1905 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1911 rc = lnet_connect(&sock, peer->ksnp_id.nid,
1912 route->ksnr_myipaddr,
1913 route->ksnr_ipaddr, route->ksnr_port);
1917 rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type);
1919 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1925 /* A +ve RC means I have to retry because I lost the connection
1926 * race or I have to renegotiate protocol version */
1927 retry_later = (rc != 0);
1929 CDEBUG(D_NET, "peer %s: conn race, retry later.\n",
1930 libcfs_nid2str(peer->ksnp_id.nid));
1932 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1935 route->ksnr_scheduled = 0;
1936 route->ksnr_connecting = 0;
1939 /* re-queue for attention; this frees me up to handle
1940 * the peer's incoming connection request */
1942 if (rc == EALREADY ||
1943 (rc == 0 && peer->ksnp_accepting > 0)) {
1944 /* We want to introduce a delay before next
1945 * attempt to connect if we lost conn race,
1946 * but the race is resolved quickly usually,
1947 * so min_reconnectms should be good heuristic */
1948 route->ksnr_retry_interval =
1949 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000;
1950 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1951 route->ksnr_retry_interval);
1954 ksocknal_launch_connection_locked(route);
1957 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1961 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1963 route->ksnr_scheduled = 0;
1964 route->ksnr_connecting = 0;
1966 /* This is a retry rather than a new connection */
1967 route->ksnr_retry_interval *= 2;
1968 route->ksnr_retry_interval =
1969 MAX(route->ksnr_retry_interval,
1970 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000);
1971 route->ksnr_retry_interval =
1972 MIN(route->ksnr_retry_interval,
1973 cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000);
1975 LASSERT (route->ksnr_retry_interval != 0);
1976 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1977 route->ksnr_retry_interval);
1979 if (!cfs_list_empty(&peer->ksnp_tx_queue) &&
1980 peer->ksnp_accepting == 0 &&
1981 ksocknal_find_connecting_route_locked(peer) == NULL) {
1984 /* ksnp_tx_queue is queued on a conn on successful
1985 * connection for V1.x and V2.x */
1986 if (!cfs_list_empty (&peer->ksnp_conns)) {
1987 conn = cfs_list_entry(peer->ksnp_conns.next,
1988 ksock_conn_t, ksnc_list);
1989 LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
1992 /* take all the blocked packets while I've got the lock and
1993 * complete below... */
1994 cfs_list_splice_init(&peer->ksnp_tx_queue, &zombies);
1997 #if 0 /* irrelevent with only eager routes */
1998 if (!route->ksnr_deleted) {
1999 /* make this route least-favourite for re-selection */
2000 cfs_list_del(&route->ksnr_list);
2001 cfs_list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
2004 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2006 ksocknal_peer_failed(peer);
2007 ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
2012 * check whether we need to create more connds.
2013 * It will try to create new thread if it's necessary, @timeout can
2014 * be updated if failed to create, so caller wouldn't keep try while
2015 * running out of resource.
2018 ksocknal_connd_check_start(long sec, long *timeout)
2022 int total = ksocknal_data.ksnd_connd_starting +
2023 ksocknal_data.ksnd_connd_running;
2025 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2026 /* still in initializing */
2030 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2031 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2032 /* can't create more connd, or still have enough
2033 * threads to handle more connecting */
2037 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2038 /* no pending connecting request */
2042 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2043 /* may run out of resource, retry later */
2044 *timeout = cfs_time_seconds(1);
2048 if (ksocknal_data.ksnd_connd_starting > 0) {
2049 /* serialize starting to avoid flood */
2053 ksocknal_data.ksnd_connd_starting_stamp = sec;
2054 ksocknal_data.ksnd_connd_starting++;
2055 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2057 /* NB: total is the next id */
2058 snprintf(name, sizeof(name), "socknal_cd%02d", total);
2059 rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
2061 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2066 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2067 ksocknal_data.ksnd_connd_starting--;
2068 ksocknal_data.ksnd_connd_failed_stamp = cfs_time_current_sec();
2074 * check whether current thread can exit, it will return 1 if there are too
2075 * many threads and no creating in past 120 seconds.
2076 * Also, this function may update @timeout to make caller come back
2077 * again to recheck these conditions.
2080 ksocknal_connd_check_stop(long sec, long *timeout)
2084 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2085 /* still in initializing */
2089 if (ksocknal_data.ksnd_connd_starting > 0) {
2090 /* in progress of starting new thread */
2094 if (ksocknal_data.ksnd_connd_running <=
2095 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2099 /* created thread in past 120 seconds? */
2100 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2101 SOCKNAL_CONND_TIMEOUT - sec);
2103 *timeout = (val > 0) ? cfs_time_seconds(val) :
2104 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2108 /* no creating in past 120 seconds */
2110 return ksocknal_data.ksnd_connd_running >
2111 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2114 /* Go through connd_routes queue looking for a route that we can process
2115 * right now, @timeout_p can be updated if we need to come back later */
2116 static ksock_route_t *
2117 ksocknal_connd_get_route_locked(signed long *timeout_p)
2119 ksock_route_t *route;
2122 now = cfs_time_current();
2124 /* connd_routes can contain both pending and ordinary routes */
2125 cfs_list_for_each_entry (route, &ksocknal_data.ksnd_connd_routes,
2128 if (route->ksnr_retry_interval == 0 ||
2129 cfs_time_aftereq(now, route->ksnr_timeout))
2132 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2133 (int)*timeout_p > (int)(route->ksnr_timeout - now))
2134 *timeout_p = (int)(route->ksnr_timeout - now);
2141 ksocknal_connd (void *arg)
2143 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2144 ksock_connreq_t *cr;
2149 cfs_block_allsigs ();
2151 init_waitqueue_entry_current(&wait);
2153 spin_lock_bh(connd_lock);
2155 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2156 ksocknal_data.ksnd_connd_starting--;
2157 ksocknal_data.ksnd_connd_running++;
2159 while (!ksocknal_data.ksnd_shuttingdown) {
2160 ksock_route_t *route = NULL;
2161 long sec = cfs_time_current_sec();
2162 long timeout = MAX_SCHEDULE_TIMEOUT;
2163 int dropped_lock = 0;
2165 if (ksocknal_connd_check_stop(sec, &timeout)) {
2166 /* wakeup another one to check stop */
2167 wake_up(&ksocknal_data.ksnd_connd_waitq);
2171 if (ksocknal_connd_check_start(sec, &timeout)) {
2172 /* created new thread */
2176 if (!cfs_list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2177 /* Connection accepted by the listener */
2178 cr = cfs_list_entry(ksocknal_data.ksnd_connd_connreqs. \
2179 next, ksock_connreq_t, ksncr_list);
2181 cfs_list_del(&cr->ksncr_list);
2182 spin_unlock_bh(connd_lock);
2185 ksocknal_create_conn(cr->ksncr_ni, NULL,
2186 cr->ksncr_sock, SOCKLND_CONN_NONE);
2187 lnet_ni_decref(cr->ksncr_ni);
2188 LIBCFS_FREE(cr, sizeof(*cr));
2190 spin_lock_bh(connd_lock);
2193 /* Only handle an outgoing connection request if there
2194 * is a thread left to handle incoming connections and
2195 * create new connd */
2196 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2197 ksocknal_data.ksnd_connd_running) {
2198 route = ksocknal_connd_get_route_locked(&timeout);
2200 if (route != NULL) {
2201 cfs_list_del (&route->ksnr_connd_list);
2202 ksocknal_data.ksnd_connd_connecting++;
2203 spin_unlock_bh(connd_lock);
2206 if (ksocknal_connect(route)) {
2207 /* consecutive retry */
2208 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2209 CWARN("massive consecutive "
2210 "re-connecting to %u.%u.%u.%u\n",
2211 HIPQUAD(route->ksnr_ipaddr));
2218 ksocknal_route_decref(route);
2220 spin_lock_bh(connd_lock);
2221 ksocknal_data.ksnd_connd_connecting--;
2225 if (++nloops < SOCKNAL_RESCHED)
2227 spin_unlock_bh(connd_lock);
2230 spin_lock_bh(connd_lock);
2234 /* Nothing to do for 'timeout' */
2235 set_current_state(TASK_INTERRUPTIBLE);
2236 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
2237 spin_unlock_bh(connd_lock);
2240 waitq_timedwait(&wait, TASK_INTERRUPTIBLE, timeout);
2242 set_current_state(TASK_RUNNING);
2243 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2244 spin_lock_bh(connd_lock);
2246 ksocknal_data.ksnd_connd_running--;
2247 spin_unlock_bh(connd_lock);
2249 ksocknal_thread_fini();
2254 ksocknal_find_timed_out_conn (ksock_peer_t *peer)
2256 /* We're called with a shared lock on ksnd_global_lock */
2260 cfs_list_for_each (ctmp, &peer->ksnp_conns) {
2262 conn = cfs_list_entry (ctmp, ksock_conn_t, ksnc_list);
2264 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2265 LASSERT (!conn->ksnc_closing);
2267 /* SOCK_ERROR will reset error code of socket in
2268 * some platform (like Darwin8.x) */
2269 error = libcfs_sock_error(conn->ksnc_sock);
2271 ksocknal_conn_addref(conn);
2275 CNETERR("A connection with %s "
2276 "(%u.%u.%u.%u:%d) was reset; "
2277 "it may have rebooted.\n",
2278 libcfs_id2str(peer->ksnp_id),
2279 HIPQUAD(conn->ksnc_ipaddr),
2283 CNETERR("A connection with %s "
2284 "(%u.%u.%u.%u:%d) timed out; the "
2285 "network or node may be down.\n",
2286 libcfs_id2str(peer->ksnp_id),
2287 HIPQUAD(conn->ksnc_ipaddr),
2291 CNETERR("An unexpected network error %d "
2293 "(%u.%u.%u.%u:%d\n", error,
2294 libcfs_id2str(peer->ksnp_id),
2295 HIPQUAD(conn->ksnc_ipaddr),
2303 if (conn->ksnc_rx_started &&
2304 cfs_time_aftereq(cfs_time_current(),
2305 conn->ksnc_rx_deadline)) {
2306 /* Timed out incomplete incoming message */
2307 ksocknal_conn_addref(conn);
2308 CNETERR("Timeout receiving from %s (%u.%u.%u.%u:%d), "
2309 "state %d wanted %d left %d\n",
2310 libcfs_id2str(peer->ksnp_id),
2311 HIPQUAD(conn->ksnc_ipaddr),
2313 conn->ksnc_rx_state,
2314 conn->ksnc_rx_nob_wanted,
2315 conn->ksnc_rx_nob_left);
2319 if ((!cfs_list_empty(&conn->ksnc_tx_queue) ||
2320 libcfs_sock_wmem_queued(conn->ksnc_sock) != 0) &&
2321 cfs_time_aftereq(cfs_time_current(),
2322 conn->ksnc_tx_deadline)) {
2323 /* Timed out messages queued for sending or
2324 * buffered in the socket's send buffer */
2325 ksocknal_conn_addref(conn);
2326 CNETERR("Timeout sending data to %s (%u.%u.%u.%u:%d) "
2327 "the network or that node may be down.\n",
2328 libcfs_id2str(peer->ksnp_id),
2329 HIPQUAD(conn->ksnc_ipaddr),
2339 ksocknal_flush_stale_txs(ksock_peer_t *peer)
2342 CFS_LIST_HEAD (stale_txs);
2344 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2346 while (!cfs_list_empty (&peer->ksnp_tx_queue)) {
2347 tx = cfs_list_entry (peer->ksnp_tx_queue.next,
2348 ksock_tx_t, tx_list);
2350 if (!cfs_time_aftereq(cfs_time_current(),
2354 cfs_list_del (&tx->tx_list);
2355 cfs_list_add_tail (&tx->tx_list, &stale_txs);
2358 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2360 ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
2364 ksocknal_send_keepalive_locked(ksock_peer_t *peer)
2366 ksock_sched_t *sched;
2370 if (cfs_list_empty(&peer->ksnp_conns)) /* last_alive will be updated by create_conn */
2373 if (peer->ksnp_proto != &ksocknal_protocol_v3x)
2376 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2377 cfs_time_before(cfs_time_current(),
2378 cfs_time_add(peer->ksnp_last_alive,
2379 cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
2382 if (cfs_time_before(cfs_time_current(),
2383 peer->ksnp_send_keepalive))
2386 /* retry 10 secs later, so we wouldn't put pressure
2387 * on this peer if we failed to send keepalive this time */
2388 peer->ksnp_send_keepalive = cfs_time_shift(10);
2390 conn = ksocknal_find_conn_locked(peer, NULL, 1);
2392 sched = conn->ksnc_scheduler;
2394 spin_lock_bh(&sched->kss_lock);
2395 if (!cfs_list_empty(&conn->ksnc_tx_queue)) {
2396 spin_unlock_bh(&sched->kss_lock);
2397 /* there is an queued ACK, don't need keepalive */
2401 spin_unlock_bh(&sched->kss_lock);
2404 read_unlock(&ksocknal_data.ksnd_global_lock);
2406 /* cookie = 1 is reserved for keepalive PING */
2407 tx = ksocknal_alloc_tx_noop(1, 1);
2409 read_lock(&ksocknal_data.ksnd_global_lock);
2413 if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) {
2414 read_lock(&ksocknal_data.ksnd_global_lock);
2418 ksocknal_free_tx(tx);
2419 read_lock(&ksocknal_data.ksnd_global_lock);
2426 ksocknal_check_peer_timeouts (int idx)
2428 cfs_list_t *peers = &ksocknal_data.ksnd_peers[idx];
2434 /* NB. We expect to have a look at all the peers and not find any
2435 * connections to time out, so we just use a shared lock while we
2437 read_lock(&ksocknal_data.ksnd_global_lock);
2439 cfs_list_for_each_entry_typed(peer, peers, ksock_peer_t, ksnp_list) {
2440 cfs_time_t deadline = 0;
2444 if (ksocknal_send_keepalive_locked(peer) != 0) {
2445 read_unlock(&ksocknal_data.ksnd_global_lock);
2449 conn = ksocknal_find_timed_out_conn (peer);
2452 read_unlock(&ksocknal_data.ksnd_global_lock);
2454 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2456 /* NB we won't find this one again, but we can't
2457 * just proceed with the next peer, since we dropped
2458 * ksnd_global_lock and it might be dead already! */
2459 ksocknal_conn_decref(conn);
2463 /* we can't process stale txs right here because we're
2464 * holding only shared lock */
2465 if (!cfs_list_empty (&peer->ksnp_tx_queue)) {
2467 cfs_list_entry (peer->ksnp_tx_queue.next,
2468 ksock_tx_t, tx_list);
2470 if (cfs_time_aftereq(cfs_time_current(),
2473 ksocknal_peer_addref(peer);
2474 read_unlock(&ksocknal_data.ksnd_global_lock);
2476 ksocknal_flush_stale_txs(peer);
2478 ksocknal_peer_decref(peer);
2483 if (cfs_list_empty(&peer->ksnp_zc_req_list))
2486 spin_lock(&peer->ksnp_lock);
2487 cfs_list_for_each_entry_typed(tx, &peer->ksnp_zc_req_list,
2488 ksock_tx_t, tx_zc_list) {
2489 if (!cfs_time_aftereq(cfs_time_current(),
2492 /* ignore the TX if connection is being closed */
2493 if (tx->tx_conn->ksnc_closing)
2499 spin_unlock(&peer->ksnp_lock);
2503 tx = cfs_list_entry(peer->ksnp_zc_req_list.next,
2504 ksock_tx_t, tx_zc_list);
2505 deadline = tx->tx_deadline;
2506 resid = tx->tx_resid;
2508 ksocknal_conn_addref(conn);
2510 spin_unlock(&peer->ksnp_lock);
2511 read_unlock(&ksocknal_data.ksnd_global_lock);
2513 CERROR("Total %d stale ZC_REQs for peer %s detected; the "
2514 "oldest(%p) timed out %ld secs ago, "
2515 "resid: %d, wmem: %d\n",
2516 n, libcfs_nid2str(peer->ksnp_id.nid), tx,
2517 cfs_duration_sec(cfs_time_current() - deadline),
2518 resid, libcfs_sock_wmem_queued(conn->ksnc_sock));
2520 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2521 ksocknal_conn_decref(conn);
2525 read_unlock(&ksocknal_data.ksnd_global_lock);
2528 int ksocknal_reaper(void *arg)
2532 ksock_sched_t *sched;
2533 cfs_list_t enomem_conns;
2535 cfs_duration_t timeout;
2538 cfs_time_t deadline = cfs_time_current();
2540 cfs_block_allsigs ();
2542 CFS_INIT_LIST_HEAD(&enomem_conns);
2543 init_waitqueue_entry_current(&wait);
2545 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2547 while (!ksocknal_data.ksnd_shuttingdown) {
2549 if (!cfs_list_empty (&ksocknal_data.ksnd_deathrow_conns)) {
2550 conn = cfs_list_entry (ksocknal_data. \
2551 ksnd_deathrow_conns.next,
2552 ksock_conn_t, ksnc_list);
2553 cfs_list_del (&conn->ksnc_list);
2555 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2557 ksocknal_terminate_conn(conn);
2558 ksocknal_conn_decref(conn);
2560 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2564 if (!cfs_list_empty (&ksocknal_data.ksnd_zombie_conns)) {
2565 conn = cfs_list_entry (ksocknal_data.ksnd_zombie_conns.\
2566 next, ksock_conn_t, ksnc_list);
2567 cfs_list_del (&conn->ksnc_list);
2569 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2571 ksocknal_destroy_conn(conn);
2573 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2577 if (!cfs_list_empty (&ksocknal_data.ksnd_enomem_conns)) {
2578 cfs_list_add(&enomem_conns,
2579 &ksocknal_data.ksnd_enomem_conns);
2580 cfs_list_del_init(&ksocknal_data.ksnd_enomem_conns);
2583 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2585 /* reschedule all the connections that stalled with ENOMEM... */
2587 while (!cfs_list_empty (&enomem_conns)) {
2588 conn = cfs_list_entry (enomem_conns.next,
2589 ksock_conn_t, ksnc_tx_list);
2590 cfs_list_del (&conn->ksnc_tx_list);
2592 sched = conn->ksnc_scheduler;
2594 spin_lock_bh(&sched->kss_lock);
2596 LASSERT(conn->ksnc_tx_scheduled);
2597 conn->ksnc_tx_ready = 1;
2598 cfs_list_add_tail(&conn->ksnc_tx_list,
2599 &sched->kss_tx_conns);
2600 wake_up(&sched->kss_waitq);
2602 spin_unlock_bh(&sched->kss_lock);
2606 /* careful with the jiffy wrap... */
2607 while ((timeout = cfs_time_sub(deadline,
2608 cfs_time_current())) <= 0) {
2611 int chunk = ksocknal_data.ksnd_peer_hash_size;
2613 /* Time to check for timeouts on a few more peers: I do
2614 * checks every 'p' seconds on a proportion of the peer
2615 * table and I need to check every connection 'n' times
2616 * within a timeout interval, to ensure I detect a
2617 * timeout on any connection within (n+1)/n times the
2618 * timeout interval. */
2620 if (*ksocknal_tunables.ksnd_timeout > n * p)
2621 chunk = (chunk * n * p) /
2622 *ksocknal_tunables.ksnd_timeout;
2626 for (i = 0; i < chunk; i++) {
2627 ksocknal_check_peer_timeouts (peer_index);
2628 peer_index = (peer_index + 1) %
2629 ksocknal_data.ksnd_peer_hash_size;
2632 deadline = cfs_time_add(deadline, cfs_time_seconds(p));
2635 if (nenomem_conns != 0) {
2636 /* Reduce my timeout if I rescheduled ENOMEM conns.
2637 * This also prevents me getting woken immediately
2638 * if any go back on my enomem list. */
2639 timeout = SOCKNAL_ENOMEM_RETRY;
2641 ksocknal_data.ksnd_reaper_waketime =
2642 cfs_time_add(cfs_time_current(), timeout);
2644 set_current_state(TASK_INTERRUPTIBLE);
2645 add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2647 if (!ksocknal_data.ksnd_shuttingdown &&
2648 cfs_list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
2649 cfs_list_empty(&ksocknal_data.ksnd_zombie_conns))
2650 waitq_timedwait(&wait, TASK_INTERRUPTIBLE, timeout);
2652 set_current_state(TASK_RUNNING);
2653 remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2655 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2658 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2660 ksocknal_thread_fini();