1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
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 cfs_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 cfs_spin_unlock(&ksocknal_data.ksnd_tx_lock);
51 LIBCFS_ALLOC(tx, size);
56 cfs_atomic_set(&tx->tx_refcount, 1);
57 tx->tx_zc_capable = 0;
58 tx->tx_zc_checked = 0;
59 tx->tx_desc_size = size;
61 cfs_atomic_inc(&ksocknal_data.ksnd_nactive_txs);
67 ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
71 tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
73 CERROR("Can't allocate noop tx desc\n");
78 tx->tx_lnetmsg = NULL;
81 tx->tx_iov = tx->tx_frags.virt.iov;
83 tx->tx_nonblk = nonblk;
85 socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_NOOP);
86 tx->tx_msg.ksm_zc_cookies[1] = cookie;
93 ksocknal_free_tx (ksock_tx_t *tx)
95 cfs_atomic_dec(&ksocknal_data.ksnd_nactive_txs);
97 if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
99 cfs_spin_lock(&ksocknal_data.ksnd_tx_lock);
101 cfs_list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
103 cfs_spin_unlock(&ksocknal_data.ksnd_tx_lock);
105 LIBCFS_FREE(tx, tx->tx_desc_size);
110 ksocknal_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
112 struct iovec *iov = tx->tx_iov;
116 LASSERT (tx->tx_niov > 0);
118 /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */
119 rc = ksocknal_lib_send_iov(conn, tx);
121 if (rc <= 0) /* sent nothing? */
125 LASSERT (nob <= tx->tx_resid);
130 LASSERT (tx->tx_niov > 0);
132 if (nob < (int) iov->iov_len) {
133 iov->iov_base = (void *)((char *)iov->iov_base + nob);
147 ksocknal_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
149 lnet_kiov_t *kiov = tx->tx_kiov;
153 LASSERT (tx->tx_niov == 0);
154 LASSERT (tx->tx_nkiov > 0);
156 /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
157 rc = ksocknal_lib_send_kiov(conn, tx);
159 if (rc <= 0) /* sent nothing? */
163 LASSERT (nob <= tx->tx_resid);
168 LASSERT(tx->tx_nkiov > 0);
170 if (nob < (int)kiov->kiov_len) {
171 kiov->kiov_offset += nob;
172 kiov->kiov_len -= nob;
176 nob -= (int)kiov->kiov_len;
177 tx->tx_kiov = ++kiov;
185 ksocknal_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
190 if (ksocknal_data.ksnd_stall_tx != 0) {
191 cfs_pause(cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
194 LASSERT (tx->tx_resid != 0);
196 rc = ksocknal_connsock_addref(conn);
198 LASSERT (conn->ksnc_closing);
203 if (ksocknal_data.ksnd_enomem_tx > 0) {
205 ksocknal_data.ksnd_enomem_tx--;
207 } else if (tx->tx_niov != 0) {
208 rc = ksocknal_send_iov (conn, tx);
210 rc = ksocknal_send_kiov (conn, tx);
213 bufnob = libcfs_sock_wmem_queued(conn->ksnc_sock);
214 if (rc > 0) /* sent something? */
215 conn->ksnc_tx_bufnob += rc; /* account it */
217 if (bufnob < conn->ksnc_tx_bufnob) {
218 /* allocated send buffer bytes < computed; infer
219 * something got ACKed */
220 conn->ksnc_tx_deadline =
221 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
222 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
223 conn->ksnc_tx_bufnob = bufnob;
227 if (rc <= 0) { /* Didn't write anything? */
229 if (rc == 0) /* some stacks return 0 instead of -EAGAIN */
232 /* Check if EAGAIN is due to memory pressure */
233 if(rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
239 /* socket's wmem_queued now includes 'rc' bytes */
240 cfs_atomic_sub (rc, &conn->ksnc_tx_nob);
243 } while (tx->tx_resid != 0);
245 ksocknal_connsock_decref(conn);
250 ksocknal_recv_iov (ksock_conn_t *conn)
252 struct iovec *iov = conn->ksnc_rx_iov;
256 LASSERT (conn->ksnc_rx_niov > 0);
258 /* Never touch conn->ksnc_rx_iov or change connection
259 * status inside ksocknal_lib_recv_iov */
260 rc = ksocknal_lib_recv_iov(conn);
265 /* received something... */
268 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
269 conn->ksnc_rx_deadline =
270 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
271 cfs_mb(); /* order with setting rx_started */
272 conn->ksnc_rx_started = 1;
274 conn->ksnc_rx_nob_wanted -= nob;
275 conn->ksnc_rx_nob_left -= nob;
278 LASSERT (conn->ksnc_rx_niov > 0);
280 if (nob < (int)iov->iov_len) {
282 iov->iov_base = (void *)((char *)iov->iov_base + nob);
287 conn->ksnc_rx_iov = ++iov;
288 conn->ksnc_rx_niov--;
295 ksocknal_recv_kiov (ksock_conn_t *conn)
297 lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
300 LASSERT (conn->ksnc_rx_nkiov > 0);
302 /* Never touch conn->ksnc_rx_kiov or change connection
303 * status inside ksocknal_lib_recv_iov */
304 rc = ksocknal_lib_recv_kiov(conn);
309 /* received something... */
312 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
313 conn->ksnc_rx_deadline =
314 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
315 cfs_mb(); /* order with setting rx_started */
316 conn->ksnc_rx_started = 1;
318 conn->ksnc_rx_nob_wanted -= nob;
319 conn->ksnc_rx_nob_left -= nob;
322 LASSERT (conn->ksnc_rx_nkiov > 0);
324 if (nob < (int) kiov->kiov_len) {
325 kiov->kiov_offset += nob;
326 kiov->kiov_len -= nob;
330 nob -= kiov->kiov_len;
331 conn->ksnc_rx_kiov = ++kiov;
332 conn->ksnc_rx_nkiov--;
339 ksocknal_receive (ksock_conn_t *conn)
341 /* Return 1 on success, 0 on EOF, < 0 on error.
342 * Caller checks ksnc_rx_nob_wanted to determine
343 * progress/completion. */
347 if (ksocknal_data.ksnd_stall_rx != 0) {
348 cfs_pause(cfs_time_seconds (ksocknal_data.ksnd_stall_rx));
351 rc = ksocknal_connsock_addref(conn);
353 LASSERT (conn->ksnc_closing);
358 if (conn->ksnc_rx_niov != 0)
359 rc = ksocknal_recv_iov (conn);
361 rc = ksocknal_recv_kiov (conn);
364 /* error/EOF or partial receive */
367 } else if (rc == 0 && conn->ksnc_rx_started) {
368 /* EOF in the middle of a message */
374 /* Completed a fragment */
376 if (conn->ksnc_rx_nob_wanted == 0) {
382 ksocknal_connsock_decref(conn);
387 ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
389 lnet_msg_t *lnetmsg = tx->tx_lnetmsg;
390 int rc = (tx->tx_resid == 0) ? 0 : -EIO;
393 LASSERT(ni != NULL || tx->tx_conn != NULL);
395 if (tx->tx_conn != NULL)
396 ksocknal_conn_decref(tx->tx_conn);
398 if (ni == NULL && tx->tx_conn != NULL)
399 ni = tx->tx_conn->ksnc_peer->ksnp_ni;
401 ksocknal_free_tx (tx);
402 if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */
403 lnet_finalize (ni, lnetmsg, rc);
409 ksocknal_txlist_done (lnet_ni_t *ni, cfs_list_t *txlist, int error)
413 while (!cfs_list_empty (txlist)) {
414 tx = cfs_list_entry (txlist->next, ksock_tx_t, tx_list);
416 if (error && tx->tx_lnetmsg != NULL) {
417 CDEBUG (D_NETERROR, "Deleting packet type %d len %d %s->%s\n",
418 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
419 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
420 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
421 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
423 CDEBUG (D_NETERROR, "Deleting noop packet\n");
426 cfs_list_del (&tx->tx_list);
428 LASSERT (cfs_atomic_read(&tx->tx_refcount) == 1);
429 ksocknal_tx_done (ni, tx);
434 ksocknal_check_zc_req(ksock_tx_t *tx)
436 ksock_conn_t *conn = tx->tx_conn;
437 ksock_peer_t *peer = conn->ksnc_peer;
439 /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
440 * to ksnp_zc_req_list if some fragment of this message should be sent
441 * zero-copy. Our peer will send an ACK containing this cookie when
442 * she has received this message to tell us we can signal completion.
443 * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
444 * ksnp_zc_req_list. */
445 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
446 LASSERT (tx->tx_zc_capable);
448 tx->tx_zc_checked = 1;
450 if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
451 !conn->ksnc_zc_capable)
454 /* assign cookie and queue tx to pending list, it will be released when
455 * a matching ack is received. See ksocknal_handle_zcack() */
457 ksocknal_tx_addref(tx);
459 cfs_spin_lock(&peer->ksnp_lock);
461 /* ZC_REQ is going to be pinned to the peer */
463 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
465 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
467 tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
469 if (peer->ksnp_zc_next_cookie == 0)
470 peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
472 cfs_list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
474 cfs_spin_unlock(&peer->ksnp_lock);
478 ksocknal_uncheck_zc_req(ksock_tx_t *tx)
480 ksock_peer_t *peer = tx->tx_conn->ksnc_peer;
482 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
483 LASSERT (tx->tx_zc_capable);
485 tx->tx_zc_checked = 0;
487 cfs_spin_lock(&peer->ksnp_lock);
489 if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
490 /* Not waiting for an ACK */
491 cfs_spin_unlock(&peer->ksnp_lock);
495 tx->tx_msg.ksm_zc_cookies[0] = 0;
496 cfs_list_del(&tx->tx_zc_list);
498 cfs_spin_unlock(&peer->ksnp_lock);
500 ksocknal_tx_decref(tx);
504 ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
508 if (tx->tx_zc_capable && !tx->tx_zc_checked)
509 ksocknal_check_zc_req(tx);
511 rc = ksocknal_transmit (conn, tx);
513 CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc);
515 if (tx->tx_resid == 0) {
516 /* Sent everything OK */
528 counter++; /* exponential backoff warnings */
529 if ((counter & (-counter)) == counter)
530 CWARN("%u ENOMEM tx %p (%u allocated)\n",
531 counter, conn, cfs_atomic_read(&libcfs_kmemory));
533 /* Queue on ksnd_enomem_conns for retry after a timeout */
534 cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
536 /* enomem list takes over scheduler's ref... */
537 LASSERT (conn->ksnc_tx_scheduled);
538 cfs_list_add_tail(&conn->ksnc_tx_list,
539 &ksocknal_data.ksnd_enomem_conns);
540 if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
541 SOCKNAL_ENOMEM_RETRY),
542 ksocknal_data.ksnd_reaper_waketime))
543 cfs_waitq_signal (&ksocknal_data.ksnd_reaper_waitq);
545 cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
552 if (!conn->ksnc_closing) {
555 LCONSOLE_WARN("Host %u.%u.%u.%u reset our connection "
556 "while we were sending data; it may have "
558 HIPQUAD(conn->ksnc_ipaddr));
561 LCONSOLE_WARN("There was an unexpected network error "
562 "while writing to %u.%u.%u.%u: %d.\n",
563 HIPQUAD(conn->ksnc_ipaddr), rc);
566 CDEBUG(D_NET, "[%p] Error %d on write to %s"
567 " ip %d.%d.%d.%d:%d\n", conn, rc,
568 libcfs_id2str(conn->ksnc_peer->ksnp_id),
569 HIPQUAD(conn->ksnc_ipaddr),
573 if (tx->tx_zc_checked)
574 ksocknal_uncheck_zc_req(tx);
576 /* it's not an error if conn is being closed */
577 ksocknal_close_conn_and_siblings (conn,
578 (conn->ksnc_closing) ? 0 : rc);
584 ksocknal_launch_connection_locked (ksock_route_t *route)
587 /* called holding write lock on ksnd_global_lock */
589 LASSERT (!route->ksnr_scheduled);
590 LASSERT (!route->ksnr_connecting);
591 LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
593 route->ksnr_scheduled = 1; /* scheduling conn for connd */
594 ksocknal_route_addref(route); /* extra ref for connd */
596 cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
598 cfs_list_add_tail (&route->ksnr_connd_list,
599 &ksocknal_data.ksnd_connd_routes);
600 cfs_waitq_signal (&ksocknal_data.ksnd_connd_waitq);
602 cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
606 ksocknal_launch_all_connections_locked (ksock_peer_t *peer)
608 ksock_route_t *route;
610 /* called holding write lock on ksnd_global_lock */
612 /* launch any/all connections that need it */
613 route = ksocknal_find_connectable_route_locked(peer);
617 ksocknal_launch_connection_locked(route);
622 ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk)
626 ksock_conn_t *typed = NULL;
627 ksock_conn_t *fallback = NULL;
631 cfs_list_for_each (tmp, &peer->ksnp_conns) {
632 ksock_conn_t *c = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
633 int nob = cfs_atomic_read(&c->ksnc_tx_nob) +
634 libcfs_sock_wmem_queued(c->ksnc_sock);
637 LASSERT (!c->ksnc_closing);
638 LASSERT (c->ksnc_proto != NULL &&
639 c->ksnc_proto->pro_match_tx != NULL);
641 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
646 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
649 case SOCKNAL_MATCH_YES: /* typed connection */
650 if (typed == NULL || tnob > nob ||
651 (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
652 cfs_time_after(typed->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
658 case SOCKNAL_MATCH_MAY: /* fallback connection */
659 if (fallback == NULL || fnob > nob ||
660 (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
661 cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
669 /* prefer the typed selection */
670 conn = (typed != NULL) ? typed : fallback;
673 conn->ksnc_tx_last_post = cfs_time_current();
679 ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *tx)
681 conn->ksnc_proto->pro_pack(tx);
683 cfs_atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
684 ksocknal_conn_addref(conn); /* +1 ref for tx */
689 ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn)
691 ksock_sched_t *sched = conn->ksnc_scheduler;
692 ksock_msg_t *msg = &tx->tx_msg;
693 ksock_tx_t *ztx = NULL;
696 /* called holding global lock (read or irq-write) and caller may
697 * not have dropped this lock between finding conn and calling me,
698 * so we don't need the {get,put}connsock dance to deref
700 LASSERT(!conn->ksnc_closing);
702 CDEBUG (D_NET, "Sending to %s ip %d.%d.%d.%d:%d\n",
703 libcfs_id2str(conn->ksnc_peer->ksnp_id),
704 HIPQUAD(conn->ksnc_ipaddr),
707 ksocknal_tx_prep(conn, tx);
709 /* Ensure the frags we've been given EXACTLY match the number of
710 * bytes we want to send. Many TCP/IP stacks disregard any total
711 * size parameters passed to them and just look at the frags.
713 * We always expect at least 1 mapped fragment containing the
714 * complete ksocknal message header. */
715 LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
716 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
717 (unsigned int)tx->tx_nob);
718 LASSERT (tx->tx_niov >= 1);
719 LASSERT (tx->tx_resid == tx->tx_nob);
721 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
722 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
724 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
727 * FIXME: SOCK_WMEM_QUEUED and SOCK_ERROR could block in __DARWIN8__
728 * but they're used inside spinlocks a lot.
730 bufnob = libcfs_sock_wmem_queued(conn->ksnc_sock);
731 cfs_spin_lock_bh (&sched->kss_lock);
733 if (cfs_list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
734 /* First packet starts the timeout */
735 conn->ksnc_tx_deadline =
736 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
737 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
738 conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
739 conn->ksnc_tx_bufnob = 0;
740 cfs_mb(); /* order with adding to tx_queue */
743 if (msg->ksm_type == KSOCK_MSG_NOOP) {
744 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
745 * on a normal packet so I don't need to send it */
746 LASSERT (msg->ksm_zc_cookies[1] != 0);
747 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
749 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
750 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
753 /* It's a normal packet - can it piggback a noop zc-ack that
754 * has been queued already? */
755 LASSERT (msg->ksm_zc_cookies[1] == 0);
756 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
758 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
759 /* ztx will be released later */
763 cfs_atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
764 cfs_list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
767 if (conn->ksnc_tx_ready && /* able to send */
768 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
769 /* +1 ref for scheduler */
770 ksocknal_conn_addref(conn);
771 cfs_list_add_tail (&conn->ksnc_tx_list,
772 &sched->kss_tx_conns);
773 conn->ksnc_tx_scheduled = 1;
774 cfs_waitq_signal (&sched->kss_waitq);
777 cfs_spin_unlock_bh (&sched->kss_lock);
782 ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
784 cfs_time_t now = cfs_time_current();
786 ksock_route_t *route;
788 cfs_list_for_each (tmp, &peer->ksnp_routes) {
789 route = cfs_list_entry (tmp, ksock_route_t, ksnr_list);
791 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
793 if (route->ksnr_scheduled) /* connections being established */
796 /* all route types connected ? */
797 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
800 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
801 cfs_time_aftereq(now, route->ksnr_timeout))) {
803 "Too soon to retry route %u.%u.%u.%u "
804 "(cnted %d, interval %ld, %ld secs later)\n",
805 HIPQUAD(route->ksnr_ipaddr),
806 route->ksnr_connected,
807 route->ksnr_retry_interval,
808 cfs_duration_sec(route->ksnr_timeout - now));
819 ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
822 ksock_route_t *route;
824 cfs_list_for_each (tmp, &peer->ksnp_routes) {
825 route = cfs_list_entry (tmp, ksock_route_t, ksnr_list);
827 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
829 if (route->ksnr_scheduled)
837 ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
841 cfs_rwlock_t *g_lock;
845 LASSERT (tx->tx_conn == NULL);
847 g_lock = &ksocknal_data.ksnd_global_lock;
849 for (retry = 0;; retry = 1) {
850 cfs_read_lock (g_lock);
851 peer = ksocknal_find_peer_locked(ni, id);
853 if (ksocknal_find_connectable_route_locked(peer) == NULL) {
854 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
856 /* I've got no routes that need to be
857 * connecting and I do have an actual
859 ksocknal_queue_tx_locked (tx, conn);
860 cfs_read_unlock (g_lock);
866 /* I'll need a write lock... */
867 cfs_read_unlock (g_lock);
869 cfs_write_lock_bh (g_lock);
871 peer = ksocknal_find_peer_locked(ni, id);
875 cfs_write_unlock_bh (g_lock);
877 if ((id.pid & LNET_PID_USERFLAG) != 0) {
878 CERROR("Refusing to create a connection to "
879 "userspace process %s\n", libcfs_id2str(id));
880 return -EHOSTUNREACH;
884 CERROR("Can't find peer %s\n", libcfs_id2str(id));
885 return -EHOSTUNREACH;
888 rc = ksocknal_add_peer(ni, id,
889 LNET_NIDADDR(id.nid),
890 lnet_acceptor_port());
892 CERROR("Can't add peer %s: %d\n",
893 libcfs_id2str(id), rc);
898 ksocknal_launch_all_connections_locked(peer);
900 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
902 /* Connection exists; queue message on it */
903 ksocknal_queue_tx_locked (tx, conn);
904 cfs_write_unlock_bh (g_lock);
908 if (peer->ksnp_accepting > 0 ||
909 ksocknal_find_connecting_route_locked (peer) != NULL) {
910 /* the message is going to be pinned to the peer */
912 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
914 /* Queue the message until a connection is established */
915 cfs_list_add_tail (&tx->tx_list, &peer->ksnp_tx_queue);
916 cfs_write_unlock_bh (g_lock);
920 cfs_write_unlock_bh (g_lock);
922 /* NB Routes may be ignored if connections to them failed recently */
923 CDEBUG(D_NETERROR, "No usable routes to %s\n", libcfs_id2str(id));
924 return (-EHOSTUNREACH);
928 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 (!cfs_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 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
962 CERROR("Can't allocate tx desc type %d size %d\n",
967 tx->tx_conn = NULL; /* set when assigned a conn */
968 tx->tx_lnetmsg = lntmsg;
970 if (payload_iov != NULL) {
973 tx->tx_iov = tx->tx_frags.virt.iov;
975 lnet_extract_iov(payload_niov, &tx->tx_iov[1],
976 payload_niov, payload_iov,
977 payload_offset, payload_nob);
980 tx->tx_iov = &tx->tx_frags.paged.iov;
981 tx->tx_kiov = tx->tx_frags.paged.kiov;
982 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
983 payload_niov, payload_kiov,
984 payload_offset, payload_nob);
986 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
987 tx->tx_zc_capable = 1;
990 socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_LNET);
992 /* The first fragment will be set later in pro_pack */
993 rc = ksocknal_launch_packet(ni, tx, target);
997 ksocknal_free_tx(tx);
1002 ksocknal_thread_start (int (*fn)(void *arg), void *arg)
1004 long pid = cfs_kernel_thread (fn, arg, 0);
1009 cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1010 ksocknal_data.ksnd_nthreads++;
1011 cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1016 ksocknal_thread_fini (void)
1018 cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1019 ksocknal_data.ksnd_nthreads--;
1020 cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1024 ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
1026 static char ksocknal_slop_buffer[4096];
1032 LASSERT(conn->ksnc_proto != NULL);
1034 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1035 /* Remind the socket to ack eagerly... */
1036 ksocknal_lib_eager_ack(conn);
1039 if (nob_to_skip == 0) { /* right at next packet boundary now */
1040 conn->ksnc_rx_started = 0;
1041 cfs_mb(); /* racing with timeout thread */
1043 switch (conn->ksnc_proto->pro_version) {
1044 case KSOCK_PROTO_V2:
1045 case KSOCK_PROTO_V3:
1046 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1047 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1048 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1050 conn->ksnc_rx_nob_wanted = offsetof(ksock_msg_t, ksm_u);
1051 conn->ksnc_rx_nob_left = offsetof(ksock_msg_t, ksm_u);
1052 conn->ksnc_rx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u);
1055 case KSOCK_PROTO_V1:
1056 /* Receiving bare lnet_hdr_t */
1057 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1058 conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
1059 conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
1061 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1062 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1063 conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t);
1069 conn->ksnc_rx_niov = 1;
1071 conn->ksnc_rx_kiov = NULL;
1072 conn->ksnc_rx_nkiov = 0;
1073 conn->ksnc_rx_csum = ~0;
1077 /* Set up to skip as much as possible now. If there's more left
1078 * (ran out of iov entries) we'll get called again */
1080 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1081 conn->ksnc_rx_nob_left = nob_to_skip;
1082 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1087 nob = MIN (nob_to_skip, sizeof (ksocknal_slop_buffer));
1089 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1090 conn->ksnc_rx_iov[niov].iov_len = nob;
1095 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1096 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof (struct iovec));
1098 conn->ksnc_rx_niov = niov;
1099 conn->ksnc_rx_kiov = NULL;
1100 conn->ksnc_rx_nkiov = 0;
1101 conn->ksnc_rx_nob_wanted = skipped;
1106 ksocknal_process_receive (ksock_conn_t *conn)
1109 lnet_process_id_t *id;
1112 LASSERT (cfs_atomic_read(&conn->ksnc_conn_refcount) > 0);
1114 /* NB: sched lock NOT held */
1115 /* SOCKNAL_RX_LNET_HEADER is here for backward compatability */
1116 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1117 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1118 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1119 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1121 if (conn->ksnc_rx_nob_wanted != 0) {
1122 rc = ksocknal_receive(conn);
1125 LASSERT (rc != -EAGAIN);
1128 CDEBUG (D_NET, "[%p] EOF from %s"
1129 " ip %d.%d.%d.%d:%d\n", conn,
1130 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1131 HIPQUAD(conn->ksnc_ipaddr),
1133 else if (!conn->ksnc_closing)
1134 CERROR ("[%p] Error %d on read from %s"
1135 " ip %d.%d.%d.%d:%d\n",
1137 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1138 HIPQUAD(conn->ksnc_ipaddr),
1141 /* it's not an error if conn is being closed */
1142 ksocknal_close_conn_and_siblings (conn,
1143 (conn->ksnc_closing) ? 0 : rc);
1144 return (rc == 0 ? -ESHUTDOWN : rc);
1147 if (conn->ksnc_rx_nob_wanted != 0) {
1152 switch (conn->ksnc_rx_state) {
1153 case SOCKNAL_RX_KSM_HEADER:
1154 if (conn->ksnc_flip) {
1155 __swab32s(&conn->ksnc_msg.ksm_type);
1156 __swab32s(&conn->ksnc_msg.ksm_csum);
1157 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1158 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1161 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1162 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1163 CERROR("%s: Unknown message type: %x\n",
1164 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1165 conn->ksnc_msg.ksm_type);
1166 ksocknal_new_packet(conn, 0);
1167 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1171 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1172 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1173 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1174 /* NOOP Checksum error */
1175 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1176 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1177 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1178 ksocknal_new_packet(conn, 0);
1179 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1183 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1186 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1188 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1189 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1191 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1192 conn->ksnc_msg.ksm_zc_cookies[1]);
1195 CERROR("%s: Unknown ZC-ACK cookie: "LPU64", "LPU64"\n",
1196 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1197 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1198 ksocknal_new_packet(conn, 0);
1199 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1204 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1205 ksocknal_new_packet (conn, 0);
1206 return 0; /* NOOP is done and just return */
1209 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1210 conn->ksnc_rx_nob_wanted = sizeof(ksock_lnet_msg_t);
1211 conn->ksnc_rx_nob_left = sizeof(ksock_lnet_msg_t);
1213 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1214 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1215 conn->ksnc_rx_iov[0].iov_len = sizeof(ksock_lnet_msg_t);
1217 conn->ksnc_rx_niov = 1;
1218 conn->ksnc_rx_kiov = NULL;
1219 conn->ksnc_rx_nkiov = 0;
1221 goto again; /* read lnet header now */
1223 case SOCKNAL_RX_LNET_HEADER:
1224 /* unpack message header */
1225 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1227 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1228 /* Userspace peer */
1229 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1230 id = &conn->ksnc_peer->ksnp_id;
1232 /* Substitute process ID assigned at connection time */
1233 lhdr->src_pid = cpu_to_le32(id->pid);
1234 lhdr->src_nid = cpu_to_le64(id->nid);
1237 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1238 ksocknal_conn_addref(conn); /* ++ref while parsing */
1240 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1241 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1242 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1244 /* I just received garbage: give up on this conn */
1245 ksocknal_new_packet(conn, 0);
1246 ksocknal_close_conn_and_siblings (conn, rc);
1247 ksocknal_conn_decref(conn);
1251 /* I'm racing with ksocknal_recv() */
1252 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1253 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1255 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1258 /* ksocknal_recv() got called */
1261 case SOCKNAL_RX_LNET_PAYLOAD:
1262 /* payload all received */
1265 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1266 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1267 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1268 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1269 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1270 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1274 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1275 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1277 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1278 id = &conn->ksnc_peer->ksnp_id;
1280 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1281 conn->ksnc_msg.ksm_zc_cookies[0],
1282 *ksocknal_tunables.ksnd_nonblk_zcack ||
1283 le64_to_cpu(lhdr->src_nid) != id->nid);
1286 lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
1289 ksocknal_new_packet(conn, 0);
1290 ksocknal_close_conn_and_siblings (conn, rc);
1295 case SOCKNAL_RX_SLOP:
1296 /* starting new packet? */
1297 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1298 return 0; /* come back later */
1299 goto again; /* try to finish reading slop now */
1307 return (-EINVAL); /* keep gcc happy */
1311 ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
1312 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1313 unsigned int offset, unsigned int mlen, unsigned int rlen)
1315 ksock_conn_t *conn = (ksock_conn_t *)private;
1316 ksock_sched_t *sched = conn->ksnc_scheduler;
1318 LASSERT (mlen <= rlen);
1319 LASSERT (niov <= LNET_MAX_IOV);
1321 conn->ksnc_cookie = msg;
1322 conn->ksnc_rx_nob_wanted = mlen;
1323 conn->ksnc_rx_nob_left = rlen;
1325 if (mlen == 0 || iov != NULL) {
1326 conn->ksnc_rx_nkiov = 0;
1327 conn->ksnc_rx_kiov = NULL;
1328 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1329 conn->ksnc_rx_niov =
1330 lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
1331 niov, iov, offset, mlen);
1333 conn->ksnc_rx_niov = 0;
1334 conn->ksnc_rx_iov = NULL;
1335 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1336 conn->ksnc_rx_nkiov =
1337 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1338 niov, kiov, offset, mlen);
1342 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1343 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1345 LASSERT (conn->ksnc_rx_scheduled);
1347 cfs_spin_lock_bh (&sched->kss_lock);
1349 switch (conn->ksnc_rx_state) {
1350 case SOCKNAL_RX_PARSE_WAIT:
1351 cfs_list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1352 cfs_waitq_signal (&sched->kss_waitq);
1353 LASSERT (conn->ksnc_rx_ready);
1356 case SOCKNAL_RX_PARSE:
1357 /* scheduler hasn't noticed I'm parsing yet */
1361 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1363 cfs_spin_unlock_bh (&sched->kss_lock);
1364 ksocknal_conn_decref(conn);
1369 ksocknal_sched_cansleep(ksock_sched_t *sched)
1373 cfs_spin_lock_bh (&sched->kss_lock);
1375 rc = (!ksocknal_data.ksnd_shuttingdown &&
1376 cfs_list_empty(&sched->kss_rx_conns) &&
1377 cfs_list_empty(&sched->kss_tx_conns));
1379 cfs_spin_unlock_bh (&sched->kss_lock);
1383 int ksocknal_scheduler (void *arg)
1385 ksock_sched_t *sched = (ksock_sched_t *)arg;
1390 int id = (int)(sched - ksocknal_data.ksnd_schedulers);
1393 snprintf (name, sizeof (name),"socknal_sd%02d", id);
1394 cfs_daemonize (name);
1395 cfs_block_allsigs ();
1397 if (ksocknal_lib_bind_thread_to_cpu(id))
1398 CERROR ("Can't set CPU affinity for %s to %d\n", name, id);
1400 cfs_spin_lock_bh (&sched->kss_lock);
1402 while (!ksocknal_data.ksnd_shuttingdown) {
1403 int did_something = 0;
1405 /* Ensure I progress everything semi-fairly */
1407 if (!cfs_list_empty (&sched->kss_rx_conns)) {
1408 conn = cfs_list_entry(sched->kss_rx_conns.next,
1409 ksock_conn_t, ksnc_rx_list);
1410 cfs_list_del(&conn->ksnc_rx_list);
1412 LASSERT(conn->ksnc_rx_scheduled);
1413 LASSERT(conn->ksnc_rx_ready);
1415 /* clear rx_ready in case receive isn't complete.
1416 * Do it BEFORE we call process_recv, since
1417 * data_ready can set it any time after we release
1419 conn->ksnc_rx_ready = 0;
1420 cfs_spin_unlock_bh (&sched->kss_lock);
1422 rc = ksocknal_process_receive(conn);
1424 cfs_spin_lock_bh (&sched->kss_lock);
1426 /* I'm the only one that can clear this flag */
1427 LASSERT(conn->ksnc_rx_scheduled);
1429 /* Did process_receive get everything it wanted? */
1431 conn->ksnc_rx_ready = 1;
1433 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1434 /* Conn blocked waiting for ksocknal_recv()
1435 * I change its state (under lock) to signal
1436 * it can be rescheduled */
1437 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1438 } else if (conn->ksnc_rx_ready) {
1439 /* reschedule for rx */
1440 cfs_list_add_tail (&conn->ksnc_rx_list,
1441 &sched->kss_rx_conns);
1443 conn->ksnc_rx_scheduled = 0;
1445 ksocknal_conn_decref(conn);
1451 if (!cfs_list_empty (&sched->kss_tx_conns)) {
1452 CFS_LIST_HEAD (zlist);
1454 if (!cfs_list_empty(&sched->kss_zombie_noop_txs)) {
1455 cfs_list_add(&zlist,
1456 &sched->kss_zombie_noop_txs);
1457 cfs_list_del_init(&sched->kss_zombie_noop_txs);
1460 conn = cfs_list_entry(sched->kss_tx_conns.next,
1461 ksock_conn_t, ksnc_tx_list);
1462 cfs_list_del (&conn->ksnc_tx_list);
1464 LASSERT(conn->ksnc_tx_scheduled);
1465 LASSERT(conn->ksnc_tx_ready);
1466 LASSERT(!cfs_list_empty(&conn->ksnc_tx_queue));
1468 tx = cfs_list_entry(conn->ksnc_tx_queue.next,
1469 ksock_tx_t, tx_list);
1471 if (conn->ksnc_tx_carrier == tx)
1472 ksocknal_next_tx_carrier(conn);
1474 /* dequeue now so empty list => more to send */
1475 cfs_list_del(&tx->tx_list);
1477 /* Clear tx_ready in case send isn't complete. Do
1478 * it BEFORE we call process_transmit, since
1479 * write_space can set it any time after we release
1481 conn->ksnc_tx_ready = 0;
1482 cfs_spin_unlock_bh (&sched->kss_lock);
1484 if (!cfs_list_empty(&zlist)) {
1485 /* free zombie noop txs, it's fast because
1486 * noop txs are just put in freelist */
1487 ksocknal_txlist_done(NULL, &zlist, 0);
1490 rc = ksocknal_process_transmit(conn, tx);
1492 if (rc == -ENOMEM || rc == -EAGAIN) {
1493 /* Incomplete send: replace tx on HEAD of tx_queue */
1494 cfs_spin_lock_bh (&sched->kss_lock);
1495 cfs_list_add (&tx->tx_list,
1496 &conn->ksnc_tx_queue);
1498 /* Complete send; tx -ref */
1499 ksocknal_tx_decref (tx);
1501 cfs_spin_lock_bh (&sched->kss_lock);
1502 /* assume space for more */
1503 conn->ksnc_tx_ready = 1;
1506 if (rc == -ENOMEM) {
1507 /* Do nothing; after a short timeout, this
1508 * conn will be reposted on kss_tx_conns. */
1509 } else if (conn->ksnc_tx_ready &&
1510 !cfs_list_empty (&conn->ksnc_tx_queue)) {
1511 /* reschedule for tx */
1512 cfs_list_add_tail (&conn->ksnc_tx_list,
1513 &sched->kss_tx_conns);
1515 conn->ksnc_tx_scheduled = 0;
1517 ksocknal_conn_decref(conn);
1522 if (!did_something || /* nothing to do */
1523 ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
1524 cfs_spin_unlock_bh (&sched->kss_lock);
1528 if (!did_something) { /* wait for something to do */
1529 cfs_wait_event_interruptible_exclusive(
1531 !ksocknal_sched_cansleep(sched), rc);
1537 cfs_spin_lock_bh (&sched->kss_lock);
1541 cfs_spin_unlock_bh (&sched->kss_lock);
1542 ksocknal_thread_fini ();
1547 * Add connection to kss_rx_conns of scheduler
1548 * and wakeup the scheduler.
1550 void ksocknal_read_callback (ksock_conn_t *conn)
1552 ksock_sched_t *sched;
1555 sched = conn->ksnc_scheduler;
1557 cfs_spin_lock_bh (&sched->kss_lock);
1559 conn->ksnc_rx_ready = 1;
1561 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1562 cfs_list_add_tail(&conn->ksnc_rx_list,
1563 &sched->kss_rx_conns);
1564 conn->ksnc_rx_scheduled = 1;
1565 /* extra ref for scheduler */
1566 ksocknal_conn_addref(conn);
1568 cfs_waitq_signal (&sched->kss_waitq);
1570 cfs_spin_unlock_bh (&sched->kss_lock);
1576 * Add connection to kss_tx_conns of scheduler
1577 * and wakeup the scheduler.
1579 void ksocknal_write_callback (ksock_conn_t *conn)
1581 ksock_sched_t *sched;
1584 sched = conn->ksnc_scheduler;
1586 cfs_spin_lock_bh (&sched->kss_lock);
1588 conn->ksnc_tx_ready = 1;
1590 if (!conn->ksnc_tx_scheduled && // not being progressed
1591 !cfs_list_empty(&conn->ksnc_tx_queue)){//packets to send
1592 cfs_list_add_tail (&conn->ksnc_tx_list,
1593 &sched->kss_tx_conns);
1594 conn->ksnc_tx_scheduled = 1;
1595 /* extra ref for scheduler */
1596 ksocknal_conn_addref(conn);
1598 cfs_waitq_signal (&sched->kss_waitq);
1601 cfs_spin_unlock_bh (&sched->kss_lock);
1607 ksocknal_parse_proto_version (ksock_hello_msg_t *hello)
1611 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1612 version = hello->kshm_version;
1613 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1614 version = __swab32(hello->kshm_version);
1617 #if SOCKNAL_VERSION_DEBUG
1618 if (*ksocknal_tunables.ksnd_protocol == 1)
1621 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1622 version == KSOCK_PROTO_V3)
1625 if (version == KSOCK_PROTO_V2)
1626 return &ksocknal_protocol_v2x;
1628 if (version == KSOCK_PROTO_V3)
1629 return &ksocknal_protocol_v3x;
1634 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1635 lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
1637 CLASSERT (sizeof (lnet_magicversion_t) ==
1638 offsetof (ksock_hello_msg_t, kshm_src_nid));
1640 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1641 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1642 return &ksocknal_protocol_v1x;
1649 ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1650 lnet_nid_t peer_nid, ksock_hello_msg_t *hello)
1652 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1653 ksock_net_t *net = (ksock_net_t *)ni->ni_data;
1655 LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
1657 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1658 LASSERT (conn->ksnc_proto != NULL);
1660 hello->kshm_src_nid = ni->ni_nid;
1661 hello->kshm_dst_nid = peer_nid;
1662 hello->kshm_src_pid = the_lnet.ln_pid;
1664 hello->kshm_src_incarnation = net->ksnn_incarnation;
1665 hello->kshm_ctype = conn->ksnc_type;
1667 return conn->ksnc_proto->pro_send_hello(conn, hello);
1671 ksocknal_invert_type(int type)
1675 case SOCKLND_CONN_ANY:
1676 case SOCKLND_CONN_CONTROL:
1678 case SOCKLND_CONN_BULK_IN:
1679 return SOCKLND_CONN_BULK_OUT;
1680 case SOCKLND_CONN_BULK_OUT:
1681 return SOCKLND_CONN_BULK_IN;
1683 return (SOCKLND_CONN_NONE);
1688 ksocknal_recv_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1689 ksock_hello_msg_t *hello, lnet_process_id_t *peerid,
1692 /* Return < 0 fatal error
1694 * EALREADY lost connection race
1695 * EPROTO protocol version mismatch
1697 cfs_socket_t *sock = conn->ksnc_sock;
1698 int active = (conn->ksnc_proto != NULL);
1702 ksock_proto_t *proto;
1703 lnet_process_id_t recv_id;
1705 /* socket type set on active connections - not set on passive */
1706 LASSERT (!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1708 timeout = active ? *ksocknal_tunables.ksnd_timeout :
1709 lnet_acceptor_timeout();
1711 rc = libcfs_sock_read(sock, &hello->kshm_magic, sizeof (hello->kshm_magic), timeout);
1713 CERROR ("Error %d reading HELLO from %u.%u.%u.%u\n",
1714 rc, HIPQUAD(conn->ksnc_ipaddr));
1719 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1720 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1721 hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1722 /* Unexpected magic! */
1723 CERROR ("Bad magic(1) %#08x (%#08x expected) from "
1724 "%u.%u.%u.%u\n", __cpu_to_le32 (hello->kshm_magic),
1725 LNET_PROTO_TCP_MAGIC,
1726 HIPQUAD(conn->ksnc_ipaddr));
1730 rc = libcfs_sock_read(sock, &hello->kshm_version,
1731 sizeof(hello->kshm_version), timeout);
1733 CERROR ("Error %d reading HELLO from %u.%u.%u.%u\n",
1734 rc, HIPQUAD(conn->ksnc_ipaddr));
1739 proto = ksocknal_parse_proto_version(hello);
1740 if (proto == NULL) {
1742 /* unknown protocol from peer, tell peer my protocol */
1743 conn->ksnc_proto = &ksocknal_protocol_v3x;
1744 #if SOCKNAL_VERSION_DEBUG
1745 if (*ksocknal_tunables.ksnd_protocol == 2)
1746 conn->ksnc_proto = &ksocknal_protocol_v2x;
1747 else if (*ksocknal_tunables.ksnd_protocol == 1)
1748 conn->ksnc_proto = &ksocknal_protocol_v1x;
1750 hello->kshm_nips = 0;
1751 ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1754 CERROR ("Unknown protocol version (%d.x expected)"
1755 " from %u.%u.%u.%u\n",
1756 conn->ksnc_proto->pro_version,
1757 HIPQUAD(conn->ksnc_ipaddr));
1762 proto_match = (conn->ksnc_proto == proto);
1763 conn->ksnc_proto = proto;
1765 /* receive the rest of hello message anyway */
1766 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1768 CERROR("Error %d reading or checking hello from from %u.%u.%u.%u\n",
1769 rc, HIPQUAD(conn->ksnc_ipaddr));
1774 *incarnation = hello->kshm_src_incarnation;
1776 if (hello->kshm_src_nid == LNET_NID_ANY) {
1777 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY"
1778 "from %u.%u.%u.%u\n", HIPQUAD(conn->ksnc_ipaddr));
1783 conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1784 /* Userspace NAL assigns peer process ID from socket */
1785 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1786 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1788 recv_id.nid = hello->kshm_src_nid;
1789 recv_id.pid = hello->kshm_src_pid;
1795 /* peer determines type */
1796 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1797 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1798 CERROR ("Unexpected type %d from %s ip %u.%u.%u.%u\n",
1799 hello->kshm_ctype, libcfs_id2str(*peerid),
1800 HIPQUAD(conn->ksnc_ipaddr));
1807 if (peerid->pid != recv_id.pid ||
1808 peerid->nid != recv_id.nid) {
1809 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1810 " %u.%u.%u.%u, but they claimed they were "
1811 "%s; please check your Lustre "
1813 libcfs_id2str(*peerid),
1814 HIPQUAD(conn->ksnc_ipaddr),
1815 libcfs_id2str(recv_id));
1819 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1820 /* Possible protocol mismatch or I lost the connection race */
1821 return proto_match ? EALREADY : EPROTO;
1824 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1825 CERROR ("Mismatched types: me %d, %s ip %u.%u.%u.%u %d\n",
1826 conn->ksnc_type, libcfs_id2str(*peerid),
1827 HIPQUAD(conn->ksnc_ipaddr),
1836 ksocknal_connect (ksock_route_t *route)
1838 CFS_LIST_HEAD (zombies);
1839 ksock_peer_t *peer = route->ksnr_peer;
1843 cfs_time_t deadline;
1844 int retry_later = 0;
1847 deadline = cfs_time_add(cfs_time_current(),
1848 cfs_time_seconds(*ksocknal_tunables.ksnd_timeout));
1850 cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1852 LASSERT (route->ksnr_scheduled);
1853 LASSERT (!route->ksnr_connecting);
1855 route->ksnr_connecting = 1;
1858 wanted = ksocknal_route_mask() & ~route->ksnr_connected;
1860 /* stop connecting if peer/route got closed under me, or
1861 * route got connected while queued */
1862 if (peer->ksnp_closing || route->ksnr_deleted ||
1868 /* reschedule if peer is connecting to me */
1869 if (peer->ksnp_accepting > 0) {
1871 "peer %s(%d) already connecting to me, retry later.\n",
1872 libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting);
1876 if (retry_later) /* needs reschedule */
1879 if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) {
1880 type = SOCKLND_CONN_ANY;
1881 } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) {
1882 type = SOCKLND_CONN_CONTROL;
1883 } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) {
1884 type = SOCKLND_CONN_BULK_IN;
1886 LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0);
1887 type = SOCKLND_CONN_BULK_OUT;
1890 cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1892 if (cfs_time_aftereq(cfs_time_current(), deadline)) {
1894 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1900 rc = lnet_connect(&sock, peer->ksnp_id.nid,
1901 route->ksnr_myipaddr,
1902 route->ksnr_ipaddr, route->ksnr_port);
1906 rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type);
1908 lnet_connect_console_error(rc, peer->ksnp_id.nid,
1914 /* A +ve RC means I have to retry because I lost the connection
1915 * race or I have to renegotiate protocol version */
1916 retry_later = (rc != 0);
1918 CDEBUG(D_NET, "peer %s: conn race, retry later.\n",
1919 libcfs_nid2str(peer->ksnp_id.nid));
1921 cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1924 route->ksnr_scheduled = 0;
1925 route->ksnr_connecting = 0;
1928 /* re-queue for attention; this frees me up to handle
1929 * the peer's incoming connection request */
1931 if (rc == EALREADY ||
1932 (rc == 0 && peer->ksnp_accepting > 0)) {
1933 /* We want to introduce a delay before next
1934 * attempt to connect if we lost conn race,
1935 * but the race is resolved quickly usually,
1936 * so min_reconnectms should be good heuristic */
1937 route->ksnr_retry_interval =
1938 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000;
1939 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1940 route->ksnr_retry_interval);
1943 ksocknal_launch_connection_locked(route);
1946 cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1950 cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1952 route->ksnr_scheduled = 0;
1953 route->ksnr_connecting = 0;
1955 /* This is a retry rather than a new connection */
1956 route->ksnr_retry_interval *= 2;
1957 route->ksnr_retry_interval =
1958 MAX(route->ksnr_retry_interval,
1959 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000);
1960 route->ksnr_retry_interval =
1961 MIN(route->ksnr_retry_interval,
1962 cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000);
1964 LASSERT (route->ksnr_retry_interval != 0);
1965 route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1966 route->ksnr_retry_interval);
1968 if (!cfs_list_empty(&peer->ksnp_tx_queue) &&
1969 peer->ksnp_accepting == 0 &&
1970 ksocknal_find_connecting_route_locked(peer) == NULL) {
1973 /* ksnp_tx_queue is queued on a conn on successful
1974 * connection for V1.x and V2.x */
1975 if (!cfs_list_empty (&peer->ksnp_conns)) {
1976 conn = cfs_list_entry(peer->ksnp_conns.next,
1977 ksock_conn_t, ksnc_list);
1978 LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
1981 /* take all the blocked packets while I've got the lock and
1982 * complete below... */
1983 cfs_list_splice_init(&peer->ksnp_tx_queue, &zombies);
1986 #if 0 /* irrelevent with only eager routes */
1987 if (!route->ksnr_deleted) {
1988 /* make this route least-favourite for re-selection */
1989 cfs_list_del(&route->ksnr_list);
1990 cfs_list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
1993 cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1995 ksocknal_peer_failed(peer);
1996 ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
2000 /* Go through connd_routes queue looking for a route that
2001 we can process right now */
2002 static ksock_route_t *
2003 ksocknal_connd_get_route_locked(signed long *timeout_p)
2005 ksock_route_t *route;
2008 /* Only handle an outgoing connection request if there
2009 * is someone left to handle incoming connections */
2010 if ((ksocknal_data.ksnd_connd_connecting + 1) >=
2011 *ksocknal_tunables.ksnd_nconnds)
2014 now = cfs_time_current();
2016 /* connd_routes can contain both pending and ordinary routes */
2017 cfs_list_for_each_entry (route, &ksocknal_data.ksnd_connd_routes,
2020 if (route->ksnr_retry_interval == 0 ||
2021 cfs_time_aftereq(now, route->ksnr_timeout))
2024 if (*timeout_p == CFS_MAX_SCHEDULE_TIMEOUT ||
2025 (int)*timeout_p > (int)(route->ksnr_timeout - now))
2026 *timeout_p = (int)(route->ksnr_timeout - now);
2033 ksocknal_connd (void *arg)
2035 long id = (long)(long_ptr_t)arg;
2037 ksock_connreq_t *cr;
2038 ksock_route_t *route;
2039 cfs_waitlink_t wait;
2040 signed long timeout;
2045 snprintf (name, sizeof (name), "socknal_cd%02ld", id);
2046 cfs_daemonize (name);
2047 cfs_block_allsigs ();
2049 cfs_waitlink_init (&wait);
2051 cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2053 while (!ksocknal_data.ksnd_shuttingdown) {
2057 if (!cfs_list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2058 /* Connection accepted by the listener */
2059 cr = cfs_list_entry(ksocknal_data.ksnd_connd_connreqs. \
2060 next, ksock_connreq_t, ksncr_list);
2062 cfs_list_del(&cr->ksncr_list);
2063 cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2066 ksocknal_create_conn(cr->ksncr_ni, NULL,
2067 cr->ksncr_sock, SOCKLND_CONN_NONE);
2068 lnet_ni_decref(cr->ksncr_ni);
2069 LIBCFS_FREE(cr, sizeof(*cr));
2071 cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2074 /* Sleep till explicit wake_up if no pending routes present */
2075 timeout = CFS_MAX_SCHEDULE_TIMEOUT;
2077 /* Connection request */
2078 route = ksocknal_connd_get_route_locked(&timeout);
2080 if (route != NULL) {
2081 cfs_list_del (&route->ksnr_connd_list);
2082 ksocknal_data.ksnd_connd_connecting++;
2083 cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2086 if (ksocknal_connect(route)) {
2087 /* consecutive retry */
2088 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2089 CWARN("massive consecutive "
2090 "re-connecting to %u.%u.%u.%u\n",
2091 HIPQUAD(route->ksnr_ipaddr));
2098 ksocknal_route_decref(route);
2100 cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2101 ksocknal_data.ksnd_connd_connecting--;
2105 if (++nloops < SOCKNAL_RESCHED)
2107 cfs_spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2110 cfs_spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2114 /* Nothing to do for 'timeout' */
2115 cfs_set_current_state (CFS_TASK_INTERRUPTIBLE);
2116 cfs_waitq_add_exclusive (&ksocknal_data.ksnd_connd_waitq,
2118 cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2121 cfs_waitq_timedwait (&wait, CFS_TASK_INTERRUPTIBLE, timeout);
2123 cfs_set_current_state (CFS_TASK_RUNNING);
2124 cfs_waitq_del (&ksocknal_data.ksnd_connd_waitq, &wait);
2125 cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2128 cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2130 ksocknal_thread_fini ();
2135 ksocknal_find_timed_out_conn (ksock_peer_t *peer)
2137 /* We're called with a shared lock on ksnd_global_lock */
2141 cfs_list_for_each (ctmp, &peer->ksnp_conns) {
2143 conn = cfs_list_entry (ctmp, ksock_conn_t, ksnc_list);
2145 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2146 LASSERT (!conn->ksnc_closing);
2148 /* SOCK_ERROR will reset error code of socket in
2149 * some platform (like Darwin8.x) */
2150 error = libcfs_sock_error(conn->ksnc_sock);
2152 ksocknal_conn_addref(conn);
2156 CDEBUG(D_NETERROR, "A connection with %s "
2157 "(%u.%u.%u.%u:%d) was reset; "
2158 "it may have rebooted.\n",
2159 libcfs_id2str(peer->ksnp_id),
2160 HIPQUAD(conn->ksnc_ipaddr),
2164 CDEBUG(D_NETERROR, "A connection with %s "
2165 "(%u.%u.%u.%u:%d) timed out; the "
2166 "network or node may be down.\n",
2167 libcfs_id2str(peer->ksnp_id),
2168 HIPQUAD(conn->ksnc_ipaddr),
2172 CDEBUG(D_NETERROR, "An unexpected network error %d "
2174 "(%u.%u.%u.%u:%d\n", error,
2175 libcfs_id2str(peer->ksnp_id),
2176 HIPQUAD(conn->ksnc_ipaddr),
2184 if (conn->ksnc_rx_started &&
2185 cfs_time_aftereq(cfs_time_current(),
2186 conn->ksnc_rx_deadline)) {
2187 /* Timed out incomplete incoming message */
2188 ksocknal_conn_addref(conn);
2189 CDEBUG(D_NETERROR, "Timeout receiving from %s "
2190 "(%u.%u.%u.%u:%d), state %d wanted %d left %d\n",
2191 libcfs_id2str(peer->ksnp_id),
2192 HIPQUAD(conn->ksnc_ipaddr),
2194 conn->ksnc_rx_state,
2195 conn->ksnc_rx_nob_wanted,
2196 conn->ksnc_rx_nob_left);
2200 if ((!cfs_list_empty(&conn->ksnc_tx_queue) ||
2201 libcfs_sock_wmem_queued(conn->ksnc_sock) != 0) &&
2202 cfs_time_aftereq(cfs_time_current(),
2203 conn->ksnc_tx_deadline)) {
2204 /* Timed out messages queued for sending or
2205 * buffered in the socket's send buffer */
2206 ksocknal_conn_addref(conn);
2207 CDEBUG(D_NETERROR, "Timeout sending data to %s "
2208 "(%u.%u.%u.%u:%d) the network or that "
2209 "node may be down.\n",
2210 libcfs_id2str(peer->ksnp_id),
2211 HIPQUAD(conn->ksnc_ipaddr),
2221 ksocknal_flush_stale_txs(ksock_peer_t *peer)
2224 CFS_LIST_HEAD (stale_txs);
2226 cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
2228 while (!cfs_list_empty (&peer->ksnp_tx_queue)) {
2229 tx = cfs_list_entry (peer->ksnp_tx_queue.next,
2230 ksock_tx_t, tx_list);
2232 if (!cfs_time_aftereq(cfs_time_current(),
2236 cfs_list_del (&tx->tx_list);
2237 cfs_list_add_tail (&tx->tx_list, &stale_txs);
2240 cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
2242 ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
2246 ksocknal_send_keepalive_locked(ksock_peer_t *peer)
2248 ksock_sched_t *sched;
2252 if (cfs_list_empty(&peer->ksnp_conns)) /* last_alive will be updated by create_conn */
2255 if (peer->ksnp_proto != &ksocknal_protocol_v3x)
2258 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2259 cfs_time_before(cfs_time_current(),
2260 cfs_time_add(peer->ksnp_last_alive,
2261 cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
2264 if (cfs_time_before(cfs_time_current(),
2265 peer->ksnp_send_keepalive))
2268 /* retry 10 secs later, so we wouldn't put pressure
2269 * on this peer if we failed to send keepalive this time */
2270 peer->ksnp_send_keepalive = cfs_time_shift(10);
2272 conn = ksocknal_find_conn_locked(peer, NULL, 1);
2274 sched = conn->ksnc_scheduler;
2276 cfs_spin_lock_bh (&sched->kss_lock);
2277 if (!cfs_list_empty(&conn->ksnc_tx_queue)) {
2278 cfs_spin_unlock_bh(&sched->kss_lock);
2279 /* there is an queued ACK, don't need keepalive */
2283 cfs_spin_unlock_bh(&sched->kss_lock);
2286 cfs_read_unlock(&ksocknal_data.ksnd_global_lock);
2288 /* cookie = 1 is reserved for keepalive PING */
2289 tx = ksocknal_alloc_tx_noop(1, 1);
2291 cfs_read_lock(&ksocknal_data.ksnd_global_lock);
2295 if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) {
2296 cfs_read_lock(&ksocknal_data.ksnd_global_lock);
2300 ksocknal_free_tx(tx);
2301 cfs_read_lock(&ksocknal_data.ksnd_global_lock);
2308 ksocknal_check_peer_timeouts (int idx)
2310 cfs_list_t *peers = &ksocknal_data.ksnd_peers[idx];
2316 /* NB. We expect to have a look at all the peers and not find any
2317 * connections to time out, so we just use a shared lock while we
2319 cfs_read_lock (&ksocknal_data.ksnd_global_lock);
2321 cfs_list_for_each_entry_typed(peer, peers, ksock_peer_t, ksnp_list) {
2322 cfs_time_t deadline = 0;
2326 if (ksocknal_send_keepalive_locked(peer) != 0) {
2327 cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2331 conn = ksocknal_find_timed_out_conn (peer);
2334 cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2336 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2338 /* NB we won't find this one again, but we can't
2339 * just proceed with the next peer, since we dropped
2340 * ksnd_global_lock and it might be dead already! */
2341 ksocknal_conn_decref(conn);
2345 /* we can't process stale txs right here because we're
2346 * holding only shared lock */
2347 if (!cfs_list_empty (&peer->ksnp_tx_queue)) {
2349 cfs_list_entry (peer->ksnp_tx_queue.next,
2350 ksock_tx_t, tx_list);
2352 if (cfs_time_aftereq(cfs_time_current(),
2355 ksocknal_peer_addref(peer);
2356 cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2358 ksocknal_flush_stale_txs(peer);
2360 ksocknal_peer_decref(peer);
2365 if (cfs_list_empty(&peer->ksnp_zc_req_list))
2368 cfs_spin_lock(&peer->ksnp_lock);
2369 cfs_list_for_each_entry_typed(tx, &peer->ksnp_zc_req_list,
2370 ksock_tx_t, tx_zc_list) {
2371 if (!cfs_time_aftereq(cfs_time_current(),
2374 /* ignore the TX if connection is being closed */
2375 if (tx->tx_conn->ksnc_closing)
2381 cfs_spin_unlock(&peer->ksnp_lock);
2385 tx = cfs_list_entry(peer->ksnp_zc_req_list.next,
2386 ksock_tx_t, tx_zc_list);
2387 deadline = tx->tx_deadline;
2388 resid = tx->tx_resid;
2390 ksocknal_conn_addref(conn);
2392 cfs_spin_unlock(&peer->ksnp_lock);
2393 cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2395 CERROR("Total %d stale ZC_REQs for peer %s detected; the "
2396 "oldest(%p) timed out %ld secs ago, "
2397 "resid: %d, wmem: %d\n",
2398 n, libcfs_nid2str(peer->ksnp_id.nid), tx,
2399 cfs_duration_sec(cfs_time_current() - deadline),
2400 resid, libcfs_sock_wmem_queued(conn->ksnc_sock));
2402 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2403 ksocknal_conn_decref(conn);
2407 cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2411 ksocknal_reaper (void *arg)
2413 cfs_waitlink_t wait;
2415 ksock_sched_t *sched;
2416 cfs_list_t enomem_conns;
2418 cfs_duration_t timeout;
2421 cfs_time_t deadline = cfs_time_current();
2423 cfs_daemonize ("socknal_reaper");
2424 cfs_block_allsigs ();
2426 CFS_INIT_LIST_HEAD(&enomem_conns);
2427 cfs_waitlink_init (&wait);
2429 cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2431 while (!ksocknal_data.ksnd_shuttingdown) {
2433 if (!cfs_list_empty (&ksocknal_data.ksnd_deathrow_conns)) {
2434 conn = cfs_list_entry (ksocknal_data. \
2435 ksnd_deathrow_conns.next,
2436 ksock_conn_t, ksnc_list);
2437 cfs_list_del (&conn->ksnc_list);
2439 cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2441 ksocknal_terminate_conn (conn);
2442 ksocknal_conn_decref(conn);
2444 cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2448 if (!cfs_list_empty (&ksocknal_data.ksnd_zombie_conns)) {
2449 conn = cfs_list_entry (ksocknal_data.ksnd_zombie_conns.\
2450 next, ksock_conn_t, ksnc_list);
2451 cfs_list_del (&conn->ksnc_list);
2453 cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2455 ksocknal_destroy_conn (conn);
2457 cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2461 if (!cfs_list_empty (&ksocknal_data.ksnd_enomem_conns)) {
2462 cfs_list_add(&enomem_conns,
2463 &ksocknal_data.ksnd_enomem_conns);
2464 cfs_list_del_init(&ksocknal_data.ksnd_enomem_conns);
2467 cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2469 /* reschedule all the connections that stalled with ENOMEM... */
2471 while (!cfs_list_empty (&enomem_conns)) {
2472 conn = cfs_list_entry (enomem_conns.next,
2473 ksock_conn_t, ksnc_tx_list);
2474 cfs_list_del (&conn->ksnc_tx_list);
2476 sched = conn->ksnc_scheduler;
2478 cfs_spin_lock_bh (&sched->kss_lock);
2480 LASSERT (conn->ksnc_tx_scheduled);
2481 conn->ksnc_tx_ready = 1;
2482 cfs_list_add_tail(&conn->ksnc_tx_list,
2483 &sched->kss_tx_conns);
2484 cfs_waitq_signal (&sched->kss_waitq);
2486 cfs_spin_unlock_bh (&sched->kss_lock);
2490 /* careful with the jiffy wrap... */
2491 while ((timeout = cfs_time_sub(deadline,
2492 cfs_time_current())) <= 0) {
2495 int chunk = ksocknal_data.ksnd_peer_hash_size;
2497 /* Time to check for timeouts on a few more peers: I do
2498 * checks every 'p' seconds on a proportion of the peer
2499 * table and I need to check every connection 'n' times
2500 * within a timeout interval, to ensure I detect a
2501 * timeout on any connection within (n+1)/n times the
2502 * timeout interval. */
2504 if (*ksocknal_tunables.ksnd_timeout > n * p)
2505 chunk = (chunk * n * p) /
2506 *ksocknal_tunables.ksnd_timeout;
2510 for (i = 0; i < chunk; i++) {
2511 ksocknal_check_peer_timeouts (peer_index);
2512 peer_index = (peer_index + 1) %
2513 ksocknal_data.ksnd_peer_hash_size;
2516 deadline = cfs_time_add(deadline, cfs_time_seconds(p));
2519 if (nenomem_conns != 0) {
2520 /* Reduce my timeout if I rescheduled ENOMEM conns.
2521 * This also prevents me getting woken immediately
2522 * if any go back on my enomem list. */
2523 timeout = SOCKNAL_ENOMEM_RETRY;
2525 ksocknal_data.ksnd_reaper_waketime =
2526 cfs_time_add(cfs_time_current(), timeout);
2528 cfs_set_current_state (CFS_TASK_INTERRUPTIBLE);
2529 cfs_waitq_add (&ksocknal_data.ksnd_reaper_waitq, &wait);
2531 if (!ksocknal_data.ksnd_shuttingdown &&
2532 cfs_list_empty (&ksocknal_data.ksnd_deathrow_conns) &&
2533 cfs_list_empty (&ksocknal_data.ksnd_zombie_conns))
2534 cfs_waitq_timedwait (&wait, CFS_TASK_INTERRUPTIBLE,
2537 cfs_set_current_state (CFS_TASK_RUNNING);
2538 cfs_waitq_del (&ksocknal_data.ksnd_reaper_waitq, &wait);
2540 cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2543 cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2545 ksocknal_thread_fini ();