2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
4 * Copyright (c) 2011, 2017, Intel Corporation.
6 * Author: Zach Brown <zab@zabbo.net>
7 * Author: Peter J. Braam <braam@clusterfs.com>
8 * Author: Phil Schwan <phil@clusterfs.com>
9 * Author: Eric Barton <eric@bartonsoftware.com>
11 * This file is part of Lustre, https://wiki.whamcloud.com/
13 * Portals is free software; you can redistribute it and/or
14 * modify it under the terms of version 2 of the GNU General Public
15 * License as published by the Free Software Foundation.
17 * Portals is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with Portals; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <libcfs/linux/linux-mem.h>
31 ksocknal_alloc_tx(int type, int size)
33 struct ksock_tx *tx = NULL;
35 if (type == KSOCK_MSG_NOOP) {
36 LASSERT(size == KSOCK_NOOP_TX_SIZE);
38 /* searching for a noop tx in free list */
39 spin_lock(&ksocknal_data.ksnd_tx_lock);
41 if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
42 tx = list_entry(ksocknal_data.ksnd_idle_noop_txs.next,
43 struct ksock_tx, tx_list);
44 LASSERT(tx->tx_desc_size == size);
45 list_del(&tx->tx_list);
48 spin_unlock(&ksocknal_data.ksnd_tx_lock);
52 LIBCFS_ALLOC(tx, size);
57 refcount_set(&tx->tx_refcount, 1);
58 tx->tx_zc_aborted = 0;
59 tx->tx_zc_capable = 0;
60 tx->tx_zc_checked = 0;
61 tx->tx_hstatus = LNET_MSG_STATUS_OK;
62 tx->tx_desc_size = size;
64 atomic_inc(&ksocknal_data.ksnd_nactive_txs);
70 ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
74 tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
76 CERROR("Can't allocate noop tx desc\n");
81 tx->tx_lnetmsg = NULL;
85 tx->tx_nonblk = nonblk;
87 tx->tx_msg.ksm_csum = 0;
88 tx->tx_msg.ksm_type = KSOCK_MSG_NOOP;
89 tx->tx_msg.ksm_zc_cookies[0] = 0;
90 tx->tx_msg.ksm_zc_cookies[1] = cookie;
97 ksocknal_free_tx(struct ksock_tx *tx)
99 atomic_dec(&ksocknal_data.ksnd_nactive_txs);
101 if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
103 spin_lock(&ksocknal_data.ksnd_tx_lock);
105 list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
107 spin_unlock(&ksocknal_data.ksnd_tx_lock);
109 LIBCFS_FREE(tx, tx->tx_desc_size);
114 ksocknal_send_hdr(struct ksock_conn *conn, struct ksock_tx *tx,
115 struct kvec *scratch_iov)
117 struct kvec *iov = &tx->tx_hdr;
121 LASSERT(tx->tx_niov > 0);
123 /* Never touch tx->tx_hdr inside ksocknal_lib_send_hdr() */
124 rc = ksocknal_lib_send_hdr(conn, tx, scratch_iov);
126 if (rc <= 0) /* sent nothing? */
130 LASSERT(nob <= tx->tx_resid);
134 LASSERT(tx->tx_niov == 1);
136 if (nob < (int) iov->iov_len) {
137 iov->iov_base += nob;
142 LASSERT(nob == iov->iov_len);
149 ksocknal_send_kiov(struct ksock_conn *conn, struct ksock_tx *tx,
150 struct kvec *scratch_iov)
152 struct bio_vec *kiov = tx->tx_kiov;
156 LASSERT(tx->tx_niov == 0);
157 LASSERT(tx->tx_nkiov > 0);
159 /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
160 rc = ksocknal_lib_send_kiov(conn, tx, scratch_iov);
162 if (rc <= 0) /* sent nothing? */
166 LASSERT(nob <= tx->tx_resid);
171 LASSERT(tx->tx_nkiov > 0);
173 if (nob < (int)kiov->bv_len) {
174 kiov->bv_offset += nob;
179 nob -= (int)kiov->bv_len;
180 tx->tx_kiov = ++kiov;
188 ksocknal_transmit(struct ksock_conn *conn, struct ksock_tx *tx,
189 struct kvec *scratch_iov)
194 if (ksocknal_data.ksnd_stall_tx != 0)
195 schedule_timeout_uninterruptible(
196 cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
198 LASSERT(tx->tx_resid != 0);
200 rc = ksocknal_connsock_addref(conn);
202 LASSERT(conn->ksnc_closing);
207 if (ksocknal_data.ksnd_enomem_tx > 0) {
209 ksocknal_data.ksnd_enomem_tx--;
211 } else if (tx->tx_niov != 0) {
212 rc = ksocknal_send_hdr(conn, tx, scratch_iov);
214 rc = ksocknal_send_kiov(conn, tx, scratch_iov);
217 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
218 if (rc > 0) /* sent something? */
219 conn->ksnc_tx_bufnob += rc; /* account it */
221 if (bufnob < conn->ksnc_tx_bufnob) {
222 /* allocated send buffer bytes < computed; infer
223 * something got ACKed */
224 conn->ksnc_tx_deadline = ktime_get_seconds() +
226 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
227 conn->ksnc_tx_bufnob = bufnob;
231 if (rc <= 0) { /* Didn't write anything? */
232 /* some stacks return 0 instead of -EAGAIN */
236 /* Check if EAGAIN is due to memory pressure */
237 if (rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
243 /* socket's wmem_queued now includes 'rc' bytes */
244 atomic_sub (rc, &conn->ksnc_tx_nob);
247 } while (tx->tx_resid != 0);
249 ksocknal_connsock_decref(conn);
254 ksocknal_recv_iov(struct ksock_conn *conn, struct kvec *scratchiov)
256 struct kvec *iov = conn->ksnc_rx_iov;
260 LASSERT(conn->ksnc_rx_niov > 0);
262 /* Never touch conn->ksnc_rx_iov or change connection
263 * status inside ksocknal_lib_recv_iov */
264 rc = ksocknal_lib_recv_iov(conn, scratchiov);
269 /* received something... */
272 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
273 conn->ksnc_rx_deadline = ktime_get_seconds() +
275 smp_mb(); /* order with setting rx_started */
276 conn->ksnc_rx_started = 1;
278 conn->ksnc_rx_nob_wanted -= nob;
279 conn->ksnc_rx_nob_left -= nob;
282 LASSERT(conn->ksnc_rx_niov > 0);
284 if (nob < (int)iov->iov_len) {
286 iov->iov_base += nob;
291 conn->ksnc_rx_iov = ++iov;
292 conn->ksnc_rx_niov--;
299 ksocknal_recv_kiov(struct ksock_conn *conn, struct page **rx_scratch_pgs,
300 struct kvec *scratch_iov)
302 struct bio_vec *kiov = conn->ksnc_rx_kiov;
305 LASSERT(conn->ksnc_rx_nkiov > 0);
307 /* Never touch conn->ksnc_rx_kiov or change connection
308 * status inside ksocknal_lib_recv_iov */
309 rc = ksocknal_lib_recv_kiov(conn, rx_scratch_pgs, scratch_iov);
314 /* received something... */
317 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
318 conn->ksnc_rx_deadline = ktime_get_seconds() +
320 smp_mb(); /* order with setting rx_started */
321 conn->ksnc_rx_started = 1;
323 conn->ksnc_rx_nob_wanted -= nob;
324 conn->ksnc_rx_nob_left -= nob;
327 LASSERT(conn->ksnc_rx_nkiov > 0);
329 if (nob < (int) kiov->bv_len) {
330 kiov->bv_offset += nob;
336 conn->ksnc_rx_kiov = ++kiov;
337 conn->ksnc_rx_nkiov--;
344 ksocknal_receive(struct ksock_conn *conn, struct page **rx_scratch_pgs,
345 struct kvec *scratch_iov)
347 /* Return 1 on success, 0 on EOF, < 0 on error.
348 * Caller checks ksnc_rx_nob_wanted to determine
349 * progress/completion. */
353 if (ksocknal_data.ksnd_stall_rx != 0)
354 schedule_timeout_uninterruptible(
355 cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
357 rc = ksocknal_connsock_addref(conn);
359 LASSERT(conn->ksnc_closing);
364 if (conn->ksnc_rx_niov != 0)
365 rc = ksocknal_recv_iov(conn, scratch_iov);
367 rc = ksocknal_recv_kiov(conn, rx_scratch_pgs,
371 /* error/EOF or partial receive */
374 } else if (rc == 0 && conn->ksnc_rx_started) {
375 /* EOF in the middle of a message */
381 /* Completed a fragment */
383 if (conn->ksnc_rx_nob_wanted == 0) {
389 ksocknal_connsock_decref(conn);
394 ksocknal_tx_done(struct lnet_ni *ni, struct ksock_tx *tx, int rc)
396 struct lnet_msg *lnetmsg = tx->tx_lnetmsg;
397 enum lnet_msg_hstatus hstatus = tx->tx_hstatus;
400 LASSERT(ni != NULL || tx->tx_conn != NULL);
402 if (!rc && (tx->tx_resid != 0 || tx->tx_zc_aborted)) {
404 if (hstatus == LNET_MSG_STATUS_OK)
405 hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
408 if (tx->tx_conn != NULL)
409 ksocknal_conn_decref(tx->tx_conn);
411 ksocknal_free_tx(tx);
412 if (lnetmsg != NULL) { /* KSOCK_MSG_NOOP go without lnetmsg */
413 lnetmsg->msg_health_status = hstatus;
414 lnet_finalize(lnetmsg, rc);
421 ksocknal_txlist_done(struct lnet_ni *ni, struct list_head *txlist, int error)
425 while (!list_empty(txlist)) {
426 tx = list_entry(txlist->next, struct ksock_tx, tx_list);
428 if (error && tx->tx_lnetmsg != NULL) {
429 CNETERR("Deleting packet type %d len %d %s->%s\n",
430 le32_to_cpu(tx->tx_lnetmsg->msg_hdr.type),
431 le32_to_cpu(tx->tx_lnetmsg->msg_hdr.payload_length),
432 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
433 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
435 CNETERR("Deleting noop packet\n");
438 list_del(&tx->tx_list);
440 if (tx->tx_hstatus == LNET_MSG_STATUS_OK) {
441 if (error == -ETIMEDOUT)
443 LNET_MSG_STATUS_LOCAL_TIMEOUT;
444 else if (error == -ENETDOWN ||
445 error == -EHOSTUNREACH ||
446 error == -ENETUNREACH ||
447 error == -ECONNREFUSED ||
448 error == -ECONNRESET)
449 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
451 * for all other errors we don't want to
455 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
458 LASSERT(refcount_read(&tx->tx_refcount) == 1);
459 ksocknal_tx_done(ni, tx, error);
464 ksocknal_check_zc_req(struct ksock_tx *tx)
466 struct ksock_conn *conn = tx->tx_conn;
467 struct ksock_peer_ni *peer_ni = conn->ksnc_peer;
469 /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
470 * to ksnp_zc_req_list if some fragment of this message should be sent
471 * zero-copy. Our peer_ni will send an ACK containing this cookie when
472 * she has received this message to tell us we can signal completion.
473 * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
474 * ksnp_zc_req_list. */
475 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
476 LASSERT (tx->tx_zc_capable);
478 tx->tx_zc_checked = 1;
480 if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
481 !conn->ksnc_zc_capable)
484 /* assign cookie and queue tx to pending list, it will be released when
485 * a matching ack is received. See ksocknal_handle_zcack() */
487 ksocknal_tx_addref(tx);
489 spin_lock(&peer_ni->ksnp_lock);
491 /* ZC_REQ is going to be pinned to the peer_ni */
492 tx->tx_deadline = ktime_get_seconds() +
495 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
497 tx->tx_msg.ksm_zc_cookies[0] = peer_ni->ksnp_zc_next_cookie++;
499 if (peer_ni->ksnp_zc_next_cookie == 0)
500 peer_ni->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
502 list_add_tail(&tx->tx_zc_list, &peer_ni->ksnp_zc_req_list);
504 spin_unlock(&peer_ni->ksnp_lock);
508 ksocknal_uncheck_zc_req(struct ksock_tx *tx)
510 struct ksock_peer_ni *peer_ni = tx->tx_conn->ksnc_peer;
512 LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
513 LASSERT(tx->tx_zc_capable);
515 tx->tx_zc_checked = 0;
517 spin_lock(&peer_ni->ksnp_lock);
519 if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
520 /* Not waiting for an ACK */
521 spin_unlock(&peer_ni->ksnp_lock);
525 tx->tx_msg.ksm_zc_cookies[0] = 0;
526 list_del(&tx->tx_zc_list);
528 spin_unlock(&peer_ni->ksnp_lock);
530 ksocknal_tx_decref(tx);
534 ksocknal_process_transmit(struct ksock_conn *conn, struct ksock_tx *tx,
535 struct kvec *scratch_iov)
538 bool error_sim = false;
540 if (lnet_send_error_simulation(tx->tx_lnetmsg, &tx->tx_hstatus)) {
546 if (tx->tx_zc_capable && !tx->tx_zc_checked)
547 ksocknal_check_zc_req(tx);
549 rc = ksocknal_transmit(conn, tx, scratch_iov);
551 CDEBUG(D_NET, "send(%d) %d\n", tx->tx_resid, rc);
553 if (tx->tx_resid == 0) {
554 /* Sent everything OK */
566 counter++; /* exponential backoff warnings */
567 if ((counter & (-counter)) == counter)
568 CWARN("%u ENOMEM tx %p (%lld allocated)\n",
569 counter, conn, libcfs_kmem_read());
571 /* Queue on ksnd_enomem_conns for retry after a timeout */
572 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
574 /* enomem list takes over scheduler's ref... */
575 LASSERT(conn->ksnc_tx_scheduled);
576 list_add_tail(&conn->ksnc_tx_list,
577 &ksocknal_data.ksnd_enomem_conns);
578 if (ktime_get_seconds() + SOCKNAL_ENOMEM_RETRY <
579 ksocknal_data.ksnd_reaper_waketime)
580 wake_up(&ksocknal_data.ksnd_reaper_waitq);
582 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
585 * set the health status of the message which determines
586 * whether we should retry the transmit
588 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
599 * set the health status of the message which determines
600 * whether we should retry the transmit
602 if (rc == -ETIMEDOUT)
603 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_TIMEOUT;
605 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
608 if (!conn->ksnc_closing) {
611 LCONSOLE_WARN("Host %pI4h reset our connection "
612 "while we were sending data; it may have "
617 LCONSOLE_WARN("There was an unexpected network error "
618 "while writing to %pI4h: %d.\n",
619 &conn->ksnc_ipaddr, rc);
622 CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pI4h:%d\n",
623 conn, rc, libcfs_id2str(conn->ksnc_peer->ksnp_id),
624 &conn->ksnc_ipaddr, conn->ksnc_port);
627 if (tx->tx_zc_checked)
628 ksocknal_uncheck_zc_req(tx);
630 /* it's not an error if conn is being closed */
631 ksocknal_close_conn_and_siblings(conn,
632 (conn->ksnc_closing) ? 0 : rc);
638 ksocknal_launch_connection_locked(struct ksock_route *route)
641 /* called holding write lock on ksnd_global_lock */
643 LASSERT (!route->ksnr_scheduled);
644 LASSERT (!route->ksnr_connecting);
645 LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
647 route->ksnr_scheduled = 1; /* scheduling conn for connd */
648 ksocknal_route_addref(route); /* extra ref for connd */
650 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
652 list_add_tail(&route->ksnr_connd_list,
653 &ksocknal_data.ksnd_connd_routes);
654 wake_up(&ksocknal_data.ksnd_connd_waitq);
656 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
660 ksocknal_launch_all_connections_locked(struct ksock_peer_ni *peer_ni)
662 struct ksock_route *route;
664 /* called holding write lock on ksnd_global_lock */
666 /* launch any/all connections that need it */
667 route = ksocknal_find_connectable_route_locked(peer_ni);
671 ksocknal_launch_connection_locked(route);
676 ksocknal_find_conn_locked(struct ksock_peer_ni *peer_ni, struct ksock_tx *tx, int nonblk)
678 struct list_head *tmp;
679 struct ksock_conn *conn;
680 struct ksock_conn *typed = NULL;
681 struct ksock_conn *fallback = NULL;
685 list_for_each(tmp, &peer_ni->ksnp_conns) {
686 struct ksock_conn *c = list_entry(tmp, struct ksock_conn,
688 int nob = atomic_read(&c->ksnc_tx_nob) +
689 c->ksnc_sock->sk->sk_wmem_queued;
692 LASSERT (!c->ksnc_closing);
693 LASSERT (c->ksnc_proto != NULL &&
694 c->ksnc_proto->pro_match_tx != NULL);
696 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
701 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
704 case SOCKNAL_MATCH_YES: /* typed connection */
705 if (typed == NULL || tnob > nob ||
706 (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
707 typed->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
713 case SOCKNAL_MATCH_MAY: /* fallback connection */
714 if (fallback == NULL || fnob > nob ||
715 (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
716 fallback->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
724 /* prefer the typed selection */
725 conn = (typed != NULL) ? typed : fallback;
728 conn->ksnc_tx_last_post = ktime_get_seconds();
734 ksocknal_tx_prep(struct ksock_conn *conn, struct ksock_tx *tx)
736 conn->ksnc_proto->pro_pack(tx);
738 atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
739 ksocknal_conn_addref(conn); /* +1 ref for tx */
744 ksocknal_queue_tx_locked(struct ksock_tx *tx, struct ksock_conn *conn)
746 struct ksock_sched *sched = conn->ksnc_scheduler;
747 struct ksock_msg *msg = &tx->tx_msg;
748 struct ksock_tx *ztx = NULL;
751 /* called holding global lock (read or irq-write) and caller may
752 * not have dropped this lock between finding conn and calling me,
753 * so we don't need the {get,put}connsock dance to deref
755 LASSERT(!conn->ksnc_closing);
757 CDEBUG(D_NET, "Sending to %s ip %pI4h:%d\n",
758 libcfs_id2str(conn->ksnc_peer->ksnp_id),
759 &conn->ksnc_ipaddr, conn->ksnc_port);
761 ksocknal_tx_prep(conn, tx);
763 /* Ensure the frags we've been given EXACTLY match the number of
764 * bytes we want to send. Many TCP/IP stacks disregard any total
765 * size parameters passed to them and just look at the frags.
767 * We always expect at least 1 mapped fragment containing the
768 * complete ksocknal message header.
770 LASSERT(lnet_iov_nob(tx->tx_niov, &tx->tx_hdr) +
771 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
772 (unsigned int)tx->tx_nob);
773 LASSERT(tx->tx_niov >= 1);
774 LASSERT(tx->tx_resid == tx->tx_nob);
776 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
777 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
779 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
781 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
782 spin_lock_bh(&sched->kss_lock);
784 if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
785 /* First packet starts the timeout */
786 conn->ksnc_tx_deadline = ktime_get_seconds() +
788 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
789 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
790 conn->ksnc_tx_bufnob = 0;
791 smp_mb(); /* order with adding to tx_queue */
794 if (msg->ksm_type == KSOCK_MSG_NOOP) {
795 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
796 * on a normal packet so I don't need to send it */
797 LASSERT (msg->ksm_zc_cookies[1] != 0);
798 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
800 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
801 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
804 /* It's a normal packet - can it piggback a noop zc-ack that
805 * has been queued already? */
806 LASSERT (msg->ksm_zc_cookies[1] == 0);
807 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
809 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
810 /* ztx will be released later */
814 atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
815 list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
818 if (conn->ksnc_tx_ready && /* able to send */
819 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
820 /* +1 ref for scheduler */
821 ksocknal_conn_addref(conn);
822 list_add_tail(&conn->ksnc_tx_list,
823 &sched->kss_tx_conns);
824 conn->ksnc_tx_scheduled = 1;
825 wake_up(&sched->kss_waitq);
828 spin_unlock_bh(&sched->kss_lock);
833 ksocknal_find_connectable_route_locked(struct ksock_peer_ni *peer_ni)
835 time64_t now = ktime_get_seconds();
836 struct list_head *tmp;
837 struct ksock_route *route;
839 list_for_each(tmp, &peer_ni->ksnp_routes) {
840 route = list_entry(tmp, struct ksock_route, ksnr_list);
842 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
844 if (route->ksnr_scheduled) /* connections being established */
847 /* all route types connected ? */
848 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
851 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
852 now >= route->ksnr_timeout)) {
854 "Too soon to retry route %pI4h "
855 "(cnted %d, interval %lld, %lld secs later)\n",
857 route->ksnr_connected,
858 route->ksnr_retry_interval,
859 route->ksnr_timeout - now);
870 ksocknal_find_connecting_route_locked(struct ksock_peer_ni *peer_ni)
872 struct list_head *tmp;
873 struct ksock_route *route;
875 list_for_each(tmp, &peer_ni->ksnp_routes) {
876 route = list_entry(tmp, struct ksock_route, ksnr_list);
878 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
880 if (route->ksnr_scheduled)
888 ksocknal_launch_packet(struct lnet_ni *ni, struct ksock_tx *tx,
889 struct lnet_process_id id)
891 struct ksock_peer_ni *peer_ni;
892 struct ksock_conn *conn;
897 LASSERT (tx->tx_conn == NULL);
899 g_lock = &ksocknal_data.ksnd_global_lock;
901 for (retry = 0;; retry = 1) {
903 peer_ni = ksocknal_find_peer_locked(ni, id);
904 if (peer_ni != NULL) {
905 if (ksocknal_find_connectable_route_locked(peer_ni) == NULL) {
906 conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
908 /* I've got no routes that need to be
909 * connecting and I do have an actual
911 ksocknal_queue_tx_locked (tx, conn);
918 /* I'll need a write lock... */
921 write_lock_bh(g_lock);
923 peer_ni = ksocknal_find_peer_locked(ni, id);
927 write_unlock_bh(g_lock);
929 if ((id.pid & LNET_PID_USERFLAG) != 0) {
930 CERROR("Refusing to create a connection to "
931 "userspace process %s\n", libcfs_id2str(id));
932 return -EHOSTUNREACH;
936 CERROR("Can't find peer_ni %s\n", libcfs_id2str(id));
937 return -EHOSTUNREACH;
940 rc = ksocknal_add_peer(ni, id,
941 LNET_NIDADDR(id.nid),
942 lnet_acceptor_port());
944 CERROR("Can't add peer_ni %s: %d\n",
945 libcfs_id2str(id), rc);
950 ksocknal_launch_all_connections_locked(peer_ni);
952 conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
954 /* Connection exists; queue message on it */
955 ksocknal_queue_tx_locked (tx, conn);
956 write_unlock_bh(g_lock);
960 if (peer_ni->ksnp_accepting > 0 ||
961 ksocknal_find_connecting_route_locked (peer_ni) != NULL) {
962 /* the message is going to be pinned to the peer_ni */
963 tx->tx_deadline = ktime_get_seconds() +
966 /* Queue the message until a connection is established */
967 list_add_tail(&tx->tx_list, &peer_ni->ksnp_tx_queue);
968 write_unlock_bh(g_lock);
972 write_unlock_bh(g_lock);
974 /* NB Routes may be ignored if connections to them failed recently */
975 CNETERR("No usable routes to %s\n", libcfs_id2str(id));
976 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
977 return (-EHOSTUNREACH);
981 ksocknal_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
983 /* '1' for consistency with code that checks !mpflag to restore */
984 unsigned int mpflag = 1;
985 int type = lntmsg->msg_type;
986 struct lnet_process_id target = lntmsg->msg_target;
987 unsigned int payload_niov = lntmsg->msg_niov;
988 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
989 unsigned int payload_offset = lntmsg->msg_offset;
990 unsigned int payload_nob = lntmsg->msg_len;
995 /* NB 'private' is different depending on what we're sending.
996 * Just ignore it... */
998 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
999 payload_nob, payload_niov, libcfs_id2str(target));
1001 LASSERT (payload_nob == 0 || payload_niov > 0);
1002 LASSERT (payload_niov <= LNET_MAX_IOV);
1003 LASSERT (!in_interrupt ());
1005 desc_size = offsetof(struct ksock_tx,
1006 tx_payload[payload_niov]);
1008 if (lntmsg->msg_vmflush)
1009 mpflag = memalloc_noreclaim_save();
1011 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
1013 CERROR("Can't allocate tx desc type %d size %d\n",
1015 if (lntmsg->msg_vmflush)
1016 memalloc_noreclaim_restore(mpflag);
1020 tx->tx_conn = NULL; /* set when assigned a conn */
1021 tx->tx_lnetmsg = lntmsg;
1024 tx->tx_kiov = tx->tx_payload;
1025 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
1026 payload_niov, payload_kiov,
1027 payload_offset, payload_nob);
1029 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
1030 tx->tx_zc_capable = 1;
1032 tx->tx_msg.ksm_csum = 0;
1033 tx->tx_msg.ksm_type = KSOCK_MSG_LNET;
1034 tx->tx_msg.ksm_zc_cookies[0] = 0;
1035 tx->tx_msg.ksm_zc_cookies[1] = 0;
1037 /* The first fragment will be set later in pro_pack */
1038 rc = ksocknal_launch_packet(ni, tx, target);
1040 * We can't test lntsmg->msg_vmflush again as lntmsg may
1044 memalloc_noreclaim_restore(mpflag);
1049 lntmsg->msg_health_status = tx->tx_hstatus;
1050 ksocknal_free_tx(tx);
1055 ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
1057 struct task_struct *task = kthread_run(fn, arg, "%s", name);
1060 return PTR_ERR(task);
1062 atomic_inc(&ksocknal_data.ksnd_nthreads);
1067 ksocknal_thread_fini (void)
1069 if (atomic_dec_and_test(&ksocknal_data.ksnd_nthreads))
1070 wake_up_var(&ksocknal_data.ksnd_nthreads);
1074 ksocknal_new_packet(struct ksock_conn *conn, int nob_to_skip)
1076 static char ksocknal_slop_buffer[4096];
1081 LASSERT(conn->ksnc_proto != NULL);
1083 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1084 /* Remind the socket to ack eagerly... */
1085 ksocknal_lib_eager_ack(conn);
1088 if (nob_to_skip == 0) { /* right at next packet boundary now */
1089 conn->ksnc_rx_started = 0;
1090 smp_mb(); /* racing with timeout thread */
1092 switch (conn->ksnc_proto->pro_version) {
1093 case KSOCK_PROTO_V2:
1094 case KSOCK_PROTO_V3:
1095 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1096 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1097 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1099 conn->ksnc_rx_nob_wanted = offsetof(struct ksock_msg, ksm_u);
1100 conn->ksnc_rx_nob_left = offsetof(struct ksock_msg, ksm_u);
1101 conn->ksnc_rx_iov[0].iov_len = offsetof(struct ksock_msg, ksm_u);
1104 case KSOCK_PROTO_V1:
1105 /* Receiving bare struct lnet_hdr */
1106 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1107 conn->ksnc_rx_nob_wanted = sizeof(struct lnet_hdr);
1108 conn->ksnc_rx_nob_left = sizeof(struct lnet_hdr);
1110 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1111 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1112 conn->ksnc_rx_iov[0].iov_len = sizeof(struct lnet_hdr);
1118 conn->ksnc_rx_niov = 1;
1120 conn->ksnc_rx_kiov = NULL;
1121 conn->ksnc_rx_nkiov = 0;
1122 conn->ksnc_rx_csum = ~0;
1126 /* Set up to skip as much as possible now. If there's more left
1127 * (ran out of iov entries) we'll get called again */
1129 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1130 conn->ksnc_rx_nob_left = nob_to_skip;
1131 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1136 nob = min_t(int, nob_to_skip, sizeof(ksocknal_slop_buffer));
1138 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1139 conn->ksnc_rx_iov[niov].iov_len = nob;
1144 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1145 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof(struct kvec));
1147 conn->ksnc_rx_niov = niov;
1148 conn->ksnc_rx_kiov = NULL;
1149 conn->ksnc_rx_nkiov = 0;
1150 conn->ksnc_rx_nob_wanted = skipped;
1155 ksocknal_process_receive(struct ksock_conn *conn,
1156 struct page **rx_scratch_pgs,
1157 struct kvec *scratch_iov)
1159 struct lnet_hdr *lhdr;
1160 struct lnet_process_id *id;
1163 LASSERT(refcount_read(&conn->ksnc_conn_refcount) > 0);
1165 /* NB: sched lock NOT held */
1166 /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
1167 LASSERT(conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1168 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1169 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1170 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1172 if (conn->ksnc_rx_nob_wanted != 0) {
1173 rc = ksocknal_receive(conn, rx_scratch_pgs,
1177 struct lnet_process_id ksnp_id;
1179 ksnp_id = conn->ksnc_peer->ksnp_id;
1181 LASSERT(rc != -EAGAIN);
1183 CDEBUG(D_NET, "[%p] EOF from %s "
1184 "ip %pI4h:%d\n", conn,
1185 libcfs_id2str(ksnp_id),
1188 else if (!conn->ksnc_closing)
1189 CERROR("[%p] Error %d on read from %s "
1190 "ip %pI4h:%d\n", conn, rc,
1191 libcfs_id2str(ksnp_id),
1195 /* it's not an error if conn is being closed */
1196 ksocknal_close_conn_and_siblings (conn,
1197 (conn->ksnc_closing) ? 0 : rc);
1198 return (rc == 0 ? -ESHUTDOWN : rc);
1201 if (conn->ksnc_rx_nob_wanted != 0) {
1206 switch (conn->ksnc_rx_state) {
1207 case SOCKNAL_RX_KSM_HEADER:
1208 if (conn->ksnc_flip) {
1209 __swab32s(&conn->ksnc_msg.ksm_type);
1210 __swab32s(&conn->ksnc_msg.ksm_csum);
1211 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1212 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1215 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1216 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1217 CERROR("%s: Unknown message type: %x\n",
1218 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1219 conn->ksnc_msg.ksm_type);
1220 ksocknal_new_packet(conn, 0);
1221 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1225 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1226 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1227 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1228 /* NOOP Checksum error */
1229 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1230 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1231 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1232 ksocknal_new_packet(conn, 0);
1233 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1237 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1240 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1242 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1243 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1245 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1246 conn->ksnc_msg.ksm_zc_cookies[1]);
1249 CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
1250 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1251 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1252 ksocknal_new_packet(conn, 0);
1253 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1258 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1259 ksocknal_new_packet (conn, 0);
1260 return 0; /* NOOP is done and just return */
1263 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1264 conn->ksnc_rx_nob_wanted = sizeof(struct ksock_lnet_msg);
1265 conn->ksnc_rx_nob_left = sizeof(struct ksock_lnet_msg);
1267 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1268 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1269 conn->ksnc_rx_iov[0].iov_len = sizeof(struct ksock_lnet_msg);
1271 conn->ksnc_rx_niov = 1;
1272 conn->ksnc_rx_kiov = NULL;
1273 conn->ksnc_rx_nkiov = 0;
1275 goto again; /* read lnet header now */
1277 case SOCKNAL_RX_LNET_HEADER:
1278 /* unpack message header */
1279 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1281 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1282 /* Userspace peer_ni */
1283 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1284 id = &conn->ksnc_peer->ksnp_id;
1286 /* Substitute process ID assigned at connection time */
1287 lhdr->src_pid = cpu_to_le32(id->pid);
1288 lhdr->src_nid = cpu_to_le64(id->nid);
1291 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1292 ksocknal_conn_addref(conn); /* ++ref while parsing */
1294 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1295 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1296 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1298 /* I just received garbage: give up on this conn */
1299 ksocknal_new_packet(conn, 0);
1300 ksocknal_close_conn_and_siblings (conn, rc);
1301 ksocknal_conn_decref(conn);
1305 /* I'm racing with ksocknal_recv() */
1306 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1307 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1309 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1312 /* ksocknal_recv() got called */
1315 case SOCKNAL_RX_LNET_PAYLOAD:
1316 /* payload all received */
1319 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1320 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1321 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1322 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1323 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1324 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1328 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1329 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1331 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1332 id = &conn->ksnc_peer->ksnp_id;
1334 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1335 conn->ksnc_msg.ksm_zc_cookies[0],
1336 *ksocknal_tunables.ksnd_nonblk_zcack ||
1337 le64_to_cpu(lhdr->src_nid) != id->nid);
1340 if (rc && conn->ksnc_lnet_msg)
1341 conn->ksnc_lnet_msg->msg_health_status =
1342 LNET_MSG_STATUS_REMOTE_ERROR;
1343 lnet_finalize(conn->ksnc_lnet_msg, rc);
1346 ksocknal_new_packet(conn, 0);
1347 ksocknal_close_conn_and_siblings (conn, rc);
1352 case SOCKNAL_RX_SLOP:
1353 /* starting new packet? */
1354 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1355 return 0; /* come back later */
1356 goto again; /* try to finish reading slop now */
1364 return (-EINVAL); /* keep gcc happy */
1368 ksocknal_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
1369 int delayed, unsigned int niov,
1370 struct bio_vec *kiov, unsigned int offset, unsigned int mlen,
1373 struct ksock_conn *conn = private;
1374 struct ksock_sched *sched = conn->ksnc_scheduler;
1376 LASSERT (mlen <= rlen);
1377 LASSERT (niov <= LNET_MAX_IOV);
1379 conn->ksnc_lnet_msg = msg;
1380 conn->ksnc_rx_nob_wanted = mlen;
1381 conn->ksnc_rx_nob_left = rlen;
1384 conn->ksnc_rx_nkiov = 0;
1385 conn->ksnc_rx_kiov = NULL;
1386 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1387 conn->ksnc_rx_niov = 0;
1389 conn->ksnc_rx_niov = 0;
1390 conn->ksnc_rx_iov = NULL;
1391 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1392 conn->ksnc_rx_nkiov =
1393 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1394 niov, kiov, offset, mlen);
1398 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1399 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1401 LASSERT (conn->ksnc_rx_scheduled);
1403 spin_lock_bh(&sched->kss_lock);
1405 switch (conn->ksnc_rx_state) {
1406 case SOCKNAL_RX_PARSE_WAIT:
1407 list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1408 wake_up(&sched->kss_waitq);
1409 LASSERT(conn->ksnc_rx_ready);
1412 case SOCKNAL_RX_PARSE:
1413 /* scheduler hasn't noticed I'm parsing yet */
1417 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1419 spin_unlock_bh(&sched->kss_lock);
1420 ksocknal_conn_decref(conn);
1425 ksocknal_sched_cansleep(struct ksock_sched *sched)
1429 spin_lock_bh(&sched->kss_lock);
1431 rc = (!ksocknal_data.ksnd_shuttingdown &&
1432 list_empty(&sched->kss_rx_conns) &&
1433 list_empty(&sched->kss_tx_conns));
1435 spin_unlock_bh(&sched->kss_lock);
1439 int ksocknal_scheduler(void *arg)
1441 struct ksock_sched *sched;
1442 struct ksock_conn *conn;
1443 struct ksock_tx *tx;
1445 long id = (long)arg;
1446 struct page **rx_scratch_pgs;
1447 struct kvec *scratch_iov;
1449 sched = ksocknal_data.ksnd_schedulers[KSOCK_THREAD_CPT(id)];
1451 LIBCFS_CPT_ALLOC(rx_scratch_pgs, lnet_cpt_table(), sched->kss_cpt,
1452 sizeof(*rx_scratch_pgs) * LNET_MAX_IOV);
1453 if (!rx_scratch_pgs) {
1454 CERROR("Unable to allocate scratch pages\n");
1458 LIBCFS_CPT_ALLOC(scratch_iov, lnet_cpt_table(), sched->kss_cpt,
1459 sizeof(*scratch_iov) * LNET_MAX_IOV);
1461 CERROR("Unable to allocate scratch iov\n");
1465 rc = cfs_cpt_bind(lnet_cpt_table(), sched->kss_cpt);
1467 CWARN("Can't set CPU partition affinity to %d: %d\n",
1468 sched->kss_cpt, rc);
1471 spin_lock_bh(&sched->kss_lock);
1473 while (!ksocknal_data.ksnd_shuttingdown) {
1474 int did_something = 0;
1476 /* Ensure I progress everything semi-fairly */
1478 if (!list_empty(&sched->kss_rx_conns)) {
1479 conn = list_entry(sched->kss_rx_conns.next,
1480 struct ksock_conn, ksnc_rx_list);
1481 list_del(&conn->ksnc_rx_list);
1483 LASSERT(conn->ksnc_rx_scheduled);
1484 LASSERT(conn->ksnc_rx_ready);
1486 /* clear rx_ready in case receive isn't complete.
1487 * Do it BEFORE we call process_recv, since
1488 * data_ready can set it any time after we release
1490 conn->ksnc_rx_ready = 0;
1491 spin_unlock_bh(&sched->kss_lock);
1493 rc = ksocknal_process_receive(conn, rx_scratch_pgs,
1496 spin_lock_bh(&sched->kss_lock);
1498 /* I'm the only one that can clear this flag */
1499 LASSERT(conn->ksnc_rx_scheduled);
1501 /* Did process_receive get everything it wanted? */
1503 conn->ksnc_rx_ready = 1;
1505 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1506 /* Conn blocked waiting for ksocknal_recv()
1507 * I change its state (under lock) to signal
1508 * it can be rescheduled */
1509 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1510 } else if (conn->ksnc_rx_ready) {
1511 /* reschedule for rx */
1512 list_add_tail(&conn->ksnc_rx_list,
1513 &sched->kss_rx_conns);
1515 conn->ksnc_rx_scheduled = 0;
1517 ksocknal_conn_decref(conn);
1523 if (!list_empty(&sched->kss_tx_conns)) {
1526 list_splice_init(&sched->kss_zombie_noop_txs, &zlist);
1528 conn = list_entry(sched->kss_tx_conns.next,
1529 struct ksock_conn, ksnc_tx_list);
1530 list_del(&conn->ksnc_tx_list);
1532 LASSERT(conn->ksnc_tx_scheduled);
1533 LASSERT(conn->ksnc_tx_ready);
1534 LASSERT(!list_empty(&conn->ksnc_tx_queue));
1536 tx = list_entry(conn->ksnc_tx_queue.next,
1537 struct ksock_tx, tx_list);
1539 if (conn->ksnc_tx_carrier == tx)
1540 ksocknal_next_tx_carrier(conn);
1542 /* dequeue now so empty list => more to send */
1543 list_del(&tx->tx_list);
1545 /* Clear tx_ready in case send isn't complete. Do
1546 * it BEFORE we call process_transmit, since
1547 * write_space can set it any time after we release
1549 conn->ksnc_tx_ready = 0;
1550 spin_unlock_bh(&sched->kss_lock);
1552 if (!list_empty(&zlist)) {
1553 /* free zombie noop txs, it's fast because
1554 * noop txs are just put in freelist */
1555 ksocknal_txlist_done(NULL, &zlist, 0);
1558 rc = ksocknal_process_transmit(conn, tx, scratch_iov);
1560 if (rc == -ENOMEM || rc == -EAGAIN) {
1561 /* Incomplete send: replace tx on HEAD of tx_queue */
1562 spin_lock_bh(&sched->kss_lock);
1563 list_add(&tx->tx_list,
1564 &conn->ksnc_tx_queue);
1566 /* Complete send; tx -ref */
1567 ksocknal_tx_decref(tx);
1569 spin_lock_bh(&sched->kss_lock);
1570 /* assume space for more */
1571 conn->ksnc_tx_ready = 1;
1574 if (rc == -ENOMEM) {
1575 /* Do nothing; after a short timeout, this
1576 * conn will be reposted on kss_tx_conns. */
1577 } else if (conn->ksnc_tx_ready &&
1578 !list_empty(&conn->ksnc_tx_queue)) {
1579 /* reschedule for tx */
1580 list_add_tail(&conn->ksnc_tx_list,
1581 &sched->kss_tx_conns);
1583 conn->ksnc_tx_scheduled = 0;
1585 ksocknal_conn_decref(conn);
1590 if (!did_something || /* nothing to do */
1591 need_resched()) { /* hogging CPU? */
1592 spin_unlock_bh(&sched->kss_lock);
1594 if (!did_something) { /* wait for something to do */
1595 rc = wait_event_interruptible_exclusive(
1597 !ksocknal_sched_cansleep(sched));
1603 spin_lock_bh(&sched->kss_lock);
1607 spin_unlock_bh(&sched->kss_lock);
1608 CFS_FREE_PTR_ARRAY(rx_scratch_pgs, LNET_MAX_IOV);
1609 CFS_FREE_PTR_ARRAY(scratch_iov, LNET_MAX_IOV);
1610 ksocknal_thread_fini();
1615 * Add connection to kss_rx_conns of scheduler
1616 * and wakeup the scheduler.
1618 void ksocknal_read_callback(struct ksock_conn *conn)
1620 struct ksock_sched *sched;
1623 sched = conn->ksnc_scheduler;
1625 spin_lock_bh(&sched->kss_lock);
1627 conn->ksnc_rx_ready = 1;
1629 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1630 list_add_tail(&conn->ksnc_rx_list,
1631 &sched->kss_rx_conns);
1632 conn->ksnc_rx_scheduled = 1;
1633 /* extra ref for scheduler */
1634 ksocknal_conn_addref(conn);
1636 wake_up (&sched->kss_waitq);
1638 spin_unlock_bh(&sched->kss_lock);
1644 * Add connection to kss_tx_conns of scheduler
1645 * and wakeup the scheduler.
1647 void ksocknal_write_callback(struct ksock_conn *conn)
1649 struct ksock_sched *sched;
1652 sched = conn->ksnc_scheduler;
1654 spin_lock_bh(&sched->kss_lock);
1656 conn->ksnc_tx_ready = 1;
1658 if (!conn->ksnc_tx_scheduled && /* not being progressed */
1659 !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
1660 list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
1661 conn->ksnc_tx_scheduled = 1;
1662 /* extra ref for scheduler */
1663 ksocknal_conn_addref(conn);
1665 wake_up(&sched->kss_waitq);
1668 spin_unlock_bh(&sched->kss_lock);
1673 static const struct ksock_proto *
1674 ksocknal_parse_proto_version(struct ksock_hello_msg *hello)
1678 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1679 version = hello->kshm_version;
1680 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1681 version = __swab32(hello->kshm_version);
1684 #if SOCKNAL_VERSION_DEBUG
1685 if (*ksocknal_tunables.ksnd_protocol == 1)
1688 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1689 version == KSOCK_PROTO_V3)
1692 if (version == KSOCK_PROTO_V2)
1693 return &ksocknal_protocol_v2x;
1695 if (version == KSOCK_PROTO_V3)
1696 return &ksocknal_protocol_v3x;
1701 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1702 struct lnet_magicversion *hmv;
1704 BUILD_BUG_ON(sizeof(struct lnet_magicversion) !=
1705 offsetof(struct ksock_hello_msg, kshm_src_nid));
1707 hmv = (struct lnet_magicversion *)hello;
1709 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1710 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1711 return &ksocknal_protocol_v1x;
1718 ksocknal_send_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1719 lnet_nid_t peer_nid, struct ksock_hello_msg *hello)
1721 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1722 struct ksock_net *net = (struct ksock_net *)ni->ni_data;
1724 LASSERT(hello->kshm_nips <= LNET_INTERFACES_NUM);
1726 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1727 LASSERT(conn->ksnc_proto != NULL);
1729 hello->kshm_src_nid = ni->ni_nid;
1730 hello->kshm_dst_nid = peer_nid;
1731 hello->kshm_src_pid = the_lnet.ln_pid;
1733 hello->kshm_src_incarnation = net->ksnn_incarnation;
1734 hello->kshm_ctype = conn->ksnc_type;
1736 return conn->ksnc_proto->pro_send_hello(conn, hello);
1740 ksocknal_invert_type(int type)
1744 case SOCKLND_CONN_ANY:
1745 case SOCKLND_CONN_CONTROL:
1747 case SOCKLND_CONN_BULK_IN:
1748 return SOCKLND_CONN_BULK_OUT;
1749 case SOCKLND_CONN_BULK_OUT:
1750 return SOCKLND_CONN_BULK_IN;
1752 return (SOCKLND_CONN_NONE);
1757 ksocknal_recv_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1758 struct ksock_hello_msg *hello,
1759 struct lnet_process_id *peerid,
1762 /* Return < 0 fatal error
1764 * EALREADY lost connection race
1765 * EPROTO protocol version mismatch
1767 struct socket *sock = conn->ksnc_sock;
1768 int active = (conn->ksnc_proto != NULL);
1772 const struct ksock_proto *proto;
1773 struct lnet_process_id recv_id;
1775 /* socket type set on active connections - not set on passive */
1776 LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1778 timeout = active ? ksocknal_timeout() :
1779 lnet_acceptor_timeout();
1781 rc = lnet_sock_read(sock, &hello->kshm_magic,
1782 sizeof(hello->kshm_magic), timeout);
1784 CERROR("Error %d reading HELLO from %pI4h\n",
1785 rc, &conn->ksnc_ipaddr);
1790 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1791 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1792 hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1793 /* Unexpected magic! */
1794 CERROR ("Bad magic(1) %#08x (%#08x expected) from "
1795 "%pI4h\n", __cpu_to_le32 (hello->kshm_magic),
1796 LNET_PROTO_TCP_MAGIC, &conn->ksnc_ipaddr);
1800 rc = lnet_sock_read(sock, &hello->kshm_version,
1801 sizeof(hello->kshm_version), timeout);
1803 CERROR("Error %d reading HELLO from %pI4h\n",
1804 rc, &conn->ksnc_ipaddr);
1809 proto = ksocknal_parse_proto_version(hello);
1810 if (proto == NULL) {
1812 /* unknown protocol from peer_ni, tell peer_ni my protocol */
1813 conn->ksnc_proto = &ksocknal_protocol_v3x;
1814 #if SOCKNAL_VERSION_DEBUG
1815 if (*ksocknal_tunables.ksnd_protocol == 2)
1816 conn->ksnc_proto = &ksocknal_protocol_v2x;
1817 else if (*ksocknal_tunables.ksnd_protocol == 1)
1818 conn->ksnc_proto = &ksocknal_protocol_v1x;
1820 hello->kshm_nips = 0;
1821 ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1824 CERROR("Unknown protocol version (%d.x expected) from %pI4h\n",
1825 conn->ksnc_proto->pro_version, &conn->ksnc_ipaddr);
1830 proto_match = (conn->ksnc_proto == proto);
1831 conn->ksnc_proto = proto;
1833 /* receive the rest of hello message anyway */
1834 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1836 CERROR("Error %d reading or checking hello from from %pI4h\n",
1837 rc, &conn->ksnc_ipaddr);
1842 *incarnation = hello->kshm_src_incarnation;
1844 if (hello->kshm_src_nid == LNET_NID_ANY) {
1845 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY from %pI4h\n",
1846 &conn->ksnc_ipaddr);
1851 conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1852 /* Userspace NAL assigns peer_ni process ID from socket */
1853 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1854 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1856 recv_id.nid = hello->kshm_src_nid;
1857 recv_id.pid = hello->kshm_src_pid;
1863 /* peer_ni determines type */
1864 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1865 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1866 CERROR("Unexpected type %d from %s ip %pI4h\n",
1867 hello->kshm_ctype, libcfs_id2str(*peerid),
1868 &conn->ksnc_ipaddr);
1874 if (peerid->pid != recv_id.pid ||
1875 peerid->nid != recv_id.nid) {
1876 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1877 " %pI4h, but they claimed they were "
1878 "%s; please check your Lustre "
1880 libcfs_id2str(*peerid),
1882 libcfs_id2str(recv_id));
1886 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1887 /* Possible protocol mismatch or I lost the connection race */
1888 return proto_match ? EALREADY : EPROTO;
1891 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1892 CERROR("Mismatched types: me %d, %s ip %pI4h %d\n",
1893 conn->ksnc_type, libcfs_id2str(*peerid),
1902 ksocknal_connect(struct ksock_route *route)
1905 struct ksock_peer_ni *peer_ni = route->ksnr_peer;
1908 struct socket *sock;
1910 int retry_later = 0;
1913 deadline = ktime_get_seconds() + ksocknal_timeout();
1915 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1917 LASSERT (route->ksnr_scheduled);
1918 LASSERT (!route->ksnr_connecting);
1920 route->ksnr_connecting = 1;
1923 wanted = ksocknal_route_mask() & ~route->ksnr_connected;
1925 /* stop connecting if peer_ni/route got closed under me, or
1926 * route got connected while queued */
1927 if (peer_ni->ksnp_closing || route->ksnr_deleted ||
1933 /* reschedule if peer_ni is connecting to me */
1934 if (peer_ni->ksnp_accepting > 0) {
1936 "peer_ni %s(%d) already connecting to me, retry later.\n",
1937 libcfs_nid2str(peer_ni->ksnp_id.nid), peer_ni->ksnp_accepting);
1941 if (retry_later) /* needs reschedule */
1944 if ((wanted & BIT(SOCKLND_CONN_ANY)) != 0) {
1945 type = SOCKLND_CONN_ANY;
1946 } else if ((wanted & BIT(SOCKLND_CONN_CONTROL)) != 0) {
1947 type = SOCKLND_CONN_CONTROL;
1948 } else if ((wanted & BIT(SOCKLND_CONN_BULK_IN)) != 0) {
1949 type = SOCKLND_CONN_BULK_IN;
1951 LASSERT ((wanted & BIT(SOCKLND_CONN_BULK_OUT)) != 0);
1952 type = SOCKLND_CONN_BULK_OUT;
1955 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1957 if (ktime_get_seconds() >= deadline) {
1959 lnet_connect_console_error(rc, peer_ni->ksnp_id.nid,
1965 sock = lnet_connect(peer_ni->ksnp_id.nid,
1966 route->ksnr_myiface,
1967 route->ksnr_ipaddr, route->ksnr_port,
1968 peer_ni->ksnp_ni->ni_net_ns);
1974 rc = ksocknal_create_conn(peer_ni->ksnp_ni, route, sock, type);
1976 lnet_connect_console_error(rc, peer_ni->ksnp_id.nid,
1982 /* A +ve RC means I have to retry because I lost the connection
1983 * race or I have to renegotiate protocol version */
1984 retry_later = (rc != 0);
1986 CDEBUG(D_NET, "peer_ni %s: conn race, retry later.\n",
1987 libcfs_nid2str(peer_ni->ksnp_id.nid));
1989 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1992 route->ksnr_scheduled = 0;
1993 route->ksnr_connecting = 0;
1996 /* re-queue for attention; this frees me up to handle
1997 * the peer_ni's incoming connection request */
1999 if (rc == EALREADY ||
2000 (rc == 0 && peer_ni->ksnp_accepting > 0)) {
2001 /* We want to introduce a delay before next
2002 * attempt to connect if we lost conn race,
2003 * but the race is resolved quickly usually,
2004 * so min_reconnectms should be good heuristic */
2005 route->ksnr_retry_interval = *ksocknal_tunables.ksnd_min_reconnectms / 1000;
2006 route->ksnr_timeout = ktime_get_seconds() +
2007 route->ksnr_retry_interval;
2010 ksocknal_launch_connection_locked(route);
2013 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2017 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2019 route->ksnr_scheduled = 0;
2020 route->ksnr_connecting = 0;
2022 /* This is a retry rather than a new connection */
2023 route->ksnr_retry_interval *= 2;
2024 route->ksnr_retry_interval =
2025 max_t(time64_t, route->ksnr_retry_interval,
2026 *ksocknal_tunables.ksnd_min_reconnectms / 1000);
2027 route->ksnr_retry_interval =
2028 min_t(time64_t, route->ksnr_retry_interval,
2029 *ksocknal_tunables.ksnd_max_reconnectms / 1000);
2031 LASSERT(route->ksnr_retry_interval);
2032 route->ksnr_timeout = ktime_get_seconds() + route->ksnr_retry_interval;
2034 if (!list_empty(&peer_ni->ksnp_tx_queue) &&
2035 peer_ni->ksnp_accepting == 0 &&
2036 ksocknal_find_connecting_route_locked(peer_ni) == NULL) {
2037 struct ksock_conn *conn;
2039 /* ksnp_tx_queue is queued on a conn on successful
2040 * connection for V1.x and V2.x */
2041 if (!list_empty(&peer_ni->ksnp_conns)) {
2042 conn = list_entry(peer_ni->ksnp_conns.next,
2043 struct ksock_conn, ksnc_list);
2044 LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
2047 /* take all the blocked packets while I've got the lock and
2048 * complete below... */
2049 list_splice_init(&peer_ni->ksnp_tx_queue, &zombies);
2052 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2054 ksocknal_peer_failed(peer_ni);
2055 ksocknal_txlist_done(peer_ni->ksnp_ni, &zombies, rc);
2060 * check whether we need to create more connds.
2061 * It will try to create new thread if it's necessary, @timeout can
2062 * be updated if failed to create, so caller wouldn't keep try while
2063 * running out of resource.
2066 ksocknal_connd_check_start(time64_t sec, long *timeout)
2070 int total = ksocknal_data.ksnd_connd_starting +
2071 ksocknal_data.ksnd_connd_running;
2073 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2074 /* still in initializing */
2078 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2079 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2080 /* can't create more connd, or still have enough
2081 * threads to handle more connecting */
2085 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2086 /* no pending connecting request */
2090 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2091 /* may run out of resource, retry later */
2092 *timeout = cfs_time_seconds(1);
2096 if (ksocknal_data.ksnd_connd_starting > 0) {
2097 /* serialize starting to avoid flood */
2101 ksocknal_data.ksnd_connd_starting_stamp = sec;
2102 ksocknal_data.ksnd_connd_starting++;
2103 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2105 /* NB: total is the next id */
2106 snprintf(name, sizeof(name), "socknal_cd%02d", total);
2107 rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
2109 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2114 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2115 ksocknal_data.ksnd_connd_starting--;
2116 ksocknal_data.ksnd_connd_failed_stamp = ktime_get_real_seconds();
2122 * check whether current thread can exit, it will return 1 if there are too
2123 * many threads and no creating in past 120 seconds.
2124 * Also, this function may update @timeout to make caller come back
2125 * again to recheck these conditions.
2128 ksocknal_connd_check_stop(time64_t sec, long *timeout)
2132 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2133 /* still in initializing */
2137 if (ksocknal_data.ksnd_connd_starting > 0) {
2138 /* in progress of starting new thread */
2142 if (ksocknal_data.ksnd_connd_running <=
2143 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2147 /* created thread in past 120 seconds? */
2148 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2149 SOCKNAL_CONND_TIMEOUT - sec);
2151 *timeout = (val > 0) ? cfs_time_seconds(val) :
2152 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2156 /* no creating in past 120 seconds */
2158 return ksocknal_data.ksnd_connd_running >
2159 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2162 /* Go through connd_routes queue looking for a route that we can process
2163 * right now, @timeout_p can be updated if we need to come back later */
2164 static struct ksock_route *
2165 ksocknal_connd_get_route_locked(signed long *timeout_p)
2167 time64_t now = ktime_get_seconds();
2168 struct ksock_route *route;
2170 /* connd_routes can contain both pending and ordinary routes */
2171 list_for_each_entry(route, &ksocknal_data.ksnd_connd_routes,
2174 if (route->ksnr_retry_interval == 0 ||
2175 now >= route->ksnr_timeout)
2178 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2179 *timeout_p > cfs_time_seconds(route->ksnr_timeout - now))
2180 *timeout_p = cfs_time_seconds(route->ksnr_timeout - now);
2187 ksocknal_connd(void *arg)
2189 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2190 struct ksock_connreq *cr;
2191 wait_queue_entry_t wait;
2194 init_waitqueue_entry(&wait, current);
2196 spin_lock_bh(connd_lock);
2198 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2199 ksocknal_data.ksnd_connd_starting--;
2200 ksocknal_data.ksnd_connd_running++;
2202 while (!ksocknal_data.ksnd_shuttingdown) {
2203 struct ksock_route *route = NULL;
2204 time64_t sec = ktime_get_real_seconds();
2205 long timeout = MAX_SCHEDULE_TIMEOUT;
2206 int dropped_lock = 0;
2208 if (ksocknal_connd_check_stop(sec, &timeout)) {
2209 /* wakeup another one to check stop */
2210 wake_up(&ksocknal_data.ksnd_connd_waitq);
2214 if (ksocknal_connd_check_start(sec, &timeout)) {
2215 /* created new thread */
2219 if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2220 /* Connection accepted by the listener */
2221 cr = list_entry(ksocknal_data.ksnd_connd_connreqs.next,
2222 struct ksock_connreq, ksncr_list);
2224 list_del(&cr->ksncr_list);
2225 spin_unlock_bh(connd_lock);
2228 ksocknal_create_conn(cr->ksncr_ni, NULL,
2229 cr->ksncr_sock, SOCKLND_CONN_NONE);
2230 lnet_ni_decref(cr->ksncr_ni);
2231 LIBCFS_FREE(cr, sizeof(*cr));
2233 spin_lock_bh(connd_lock);
2236 /* Only handle an outgoing connection request if there
2237 * is a thread left to handle incoming connections and
2238 * create new connd */
2239 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2240 ksocknal_data.ksnd_connd_running) {
2241 route = ksocknal_connd_get_route_locked(&timeout);
2243 if (route != NULL) {
2244 list_del(&route->ksnr_connd_list);
2245 ksocknal_data.ksnd_connd_connecting++;
2246 spin_unlock_bh(connd_lock);
2249 if (ksocknal_connect(route)) {
2250 /* consecutive retry */
2251 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2252 CWARN("massive consecutive "
2253 "re-connecting to %pI4h\n",
2254 &route->ksnr_ipaddr);
2261 ksocknal_route_decref(route);
2263 spin_lock_bh(connd_lock);
2264 ksocknal_data.ksnd_connd_connecting--;
2268 if (!need_resched())
2270 spin_unlock_bh(connd_lock);
2272 spin_lock_bh(connd_lock);
2276 /* Nothing to do for 'timeout' */
2277 set_current_state(TASK_INTERRUPTIBLE);
2278 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
2279 spin_unlock_bh(connd_lock);
2281 schedule_timeout(timeout);
2283 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2284 spin_lock_bh(connd_lock);
2286 ksocknal_data.ksnd_connd_running--;
2287 spin_unlock_bh(connd_lock);
2289 ksocknal_thread_fini();
2293 static struct ksock_conn *
2294 ksocknal_find_timed_out_conn(struct ksock_peer_ni *peer_ni)
2296 /* We're called with a shared lock on ksnd_global_lock */
2297 struct ksock_conn *conn;
2298 struct list_head *ctmp;
2299 struct ksock_tx *tx;
2301 list_for_each(ctmp, &peer_ni->ksnp_conns) {
2304 conn = list_entry(ctmp, struct ksock_conn, ksnc_list);
2306 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2307 LASSERT (!conn->ksnc_closing);
2309 error = conn->ksnc_sock->sk->sk_err;
2311 ksocknal_conn_addref(conn);
2315 CNETERR("A connection with %s "
2316 "(%pI4h:%d) was reset; "
2317 "it may have rebooted.\n",
2318 libcfs_id2str(peer_ni->ksnp_id),
2323 CNETERR("A connection with %s "
2324 "(%pI4h:%d) timed out; the "
2325 "network or node may be down.\n",
2326 libcfs_id2str(peer_ni->ksnp_id),
2331 CNETERR("An unexpected network error %d "
2333 "(%pI4h:%d\n", error,
2334 libcfs_id2str(peer_ni->ksnp_id),
2343 if (conn->ksnc_rx_started &&
2344 ktime_get_seconds() >= conn->ksnc_rx_deadline) {
2345 /* Timed out incomplete incoming message */
2346 ksocknal_conn_addref(conn);
2347 CNETERR("Timeout receiving from %s (%pI4h:%d), "
2348 "state %d wanted %d left %d\n",
2349 libcfs_id2str(peer_ni->ksnp_id),
2352 conn->ksnc_rx_state,
2353 conn->ksnc_rx_nob_wanted,
2354 conn->ksnc_rx_nob_left);
2358 if ((!list_empty(&conn->ksnc_tx_queue) ||
2359 conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
2360 ktime_get_seconds() >= conn->ksnc_tx_deadline) {
2361 /* Timed out messages queued for sending or
2362 * buffered in the socket's send buffer */
2363 ksocknal_conn_addref(conn);
2364 list_for_each_entry(tx, &conn->ksnc_tx_queue,
2367 LNET_MSG_STATUS_LOCAL_TIMEOUT;
2368 CNETERR("Timeout sending data to %s (%pI4h:%d) "
2369 "the network or that node may be down.\n",
2370 libcfs_id2str(peer_ni->ksnp_id),
2371 &conn->ksnc_ipaddr, conn->ksnc_port);
2380 ksocknal_flush_stale_txs(struct ksock_peer_ni *peer_ni)
2382 struct ksock_tx *tx;
2383 LIST_HEAD(stale_txs);
2385 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2387 while (!list_empty(&peer_ni->ksnp_tx_queue)) {
2388 tx = list_entry(peer_ni->ksnp_tx_queue.next,
2389 struct ksock_tx, tx_list);
2391 if (ktime_get_seconds() < tx->tx_deadline)
2394 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2396 list_move_tail(&tx->tx_list, &stale_txs);
2399 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2401 ksocknal_txlist_done(peer_ni->ksnp_ni, &stale_txs, -ETIMEDOUT);
2405 ksocknal_send_keepalive_locked(struct ksock_peer_ni *peer_ni)
2406 __must_hold(&ksocknal_data.ksnd_global_lock)
2408 struct ksock_sched *sched;
2409 struct ksock_conn *conn;
2410 struct ksock_tx *tx;
2412 /* last_alive will be updated by create_conn */
2413 if (list_empty(&peer_ni->ksnp_conns))
2416 if (peer_ni->ksnp_proto != &ksocknal_protocol_v3x)
2419 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2420 ktime_get_seconds() < peer_ni->ksnp_last_alive +
2421 *ksocknal_tunables.ksnd_keepalive)
2424 if (ktime_get_seconds() < peer_ni->ksnp_send_keepalive)
2427 /* retry 10 secs later, so we wouldn't put pressure
2428 * on this peer_ni if we failed to send keepalive this time */
2429 peer_ni->ksnp_send_keepalive = ktime_get_seconds() + 10;
2431 conn = ksocknal_find_conn_locked(peer_ni, NULL, 1);
2433 sched = conn->ksnc_scheduler;
2435 spin_lock_bh(&sched->kss_lock);
2436 if (!list_empty(&conn->ksnc_tx_queue)) {
2437 spin_unlock_bh(&sched->kss_lock);
2438 /* there is an queued ACK, don't need keepalive */
2442 spin_unlock_bh(&sched->kss_lock);
2445 read_unlock(&ksocknal_data.ksnd_global_lock);
2447 /* cookie = 1 is reserved for keepalive PING */
2448 tx = ksocknal_alloc_tx_noop(1, 1);
2450 read_lock(&ksocknal_data.ksnd_global_lock);
2454 if (ksocknal_launch_packet(peer_ni->ksnp_ni, tx, peer_ni->ksnp_id) == 0) {
2455 read_lock(&ksocknal_data.ksnd_global_lock);
2459 ksocknal_free_tx(tx);
2460 read_lock(&ksocknal_data.ksnd_global_lock);
2467 ksocknal_check_peer_timeouts(int idx)
2469 struct hlist_head *peers = &ksocknal_data.ksnd_peers[idx];
2470 struct ksock_peer_ni *peer_ni;
2471 struct ksock_conn *conn;
2472 struct ksock_tx *tx;
2475 /* NB. We expect to have a look at all the peers and not find any
2476 * connections to time out, so we just use a shared lock while we
2479 read_lock(&ksocknal_data.ksnd_global_lock);
2481 hlist_for_each_entry(peer_ni, peers, ksnp_list) {
2482 struct ksock_tx *tx_stale;
2483 time64_t deadline = 0;
2487 if (ksocknal_send_keepalive_locked(peer_ni) != 0) {
2488 read_unlock(&ksocknal_data.ksnd_global_lock);
2492 conn = ksocknal_find_timed_out_conn(peer_ni);
2495 read_unlock(&ksocknal_data.ksnd_global_lock);
2497 ksocknal_close_conn_and_siblings(conn, -ETIMEDOUT);
2499 /* NB we won't find this one again, but we can't
2500 * just proceed with the next peer_ni, since we dropped
2501 * ksnd_global_lock and it might be dead already!
2503 ksocknal_conn_decref(conn);
2507 /* we can't process stale txs right here because we're
2508 * holding only shared lock
2510 if (!list_empty(&peer_ni->ksnp_tx_queue)) {
2511 struct ksock_tx *tx;
2513 tx = list_entry(peer_ni->ksnp_tx_queue.next,
2514 struct ksock_tx, tx_list);
2515 if (ktime_get_seconds() >= tx->tx_deadline) {
2516 ksocknal_peer_addref(peer_ni);
2517 read_unlock(&ksocknal_data.ksnd_global_lock);
2519 ksocknal_flush_stale_txs(peer_ni);
2521 ksocknal_peer_decref(peer_ni);
2526 if (list_empty(&peer_ni->ksnp_zc_req_list))
2530 spin_lock(&peer_ni->ksnp_lock);
2531 list_for_each_entry(tx, &peer_ni->ksnp_zc_req_list, tx_zc_list) {
2532 if (ktime_get_seconds() < tx->tx_deadline)
2534 /* ignore the TX if connection is being closed */
2535 if (tx->tx_conn->ksnc_closing)
2538 if (tx_stale == NULL)
2542 if (tx_stale == NULL) {
2543 spin_unlock(&peer_ni->ksnp_lock);
2547 deadline = tx_stale->tx_deadline;
2548 resid = tx_stale->tx_resid;
2549 conn = tx_stale->tx_conn;
2550 ksocknal_conn_addref(conn);
2552 spin_unlock(&peer_ni->ksnp_lock);
2553 read_unlock(&ksocknal_data.ksnd_global_lock);
2555 CERROR("Total %d stale ZC_REQs for peer_ni %s detected; the "
2556 "oldest(%p) timed out %lld secs ago, "
2557 "resid: %d, wmem: %d\n",
2558 n, libcfs_nid2str(peer_ni->ksnp_id.nid), tx_stale,
2559 ktime_get_seconds() - deadline,
2560 resid, conn->ksnc_sock->sk->sk_wmem_queued);
2562 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2563 ksocknal_conn_decref(conn);
2567 read_unlock(&ksocknal_data.ksnd_global_lock);
2570 int ksocknal_reaper(void *arg)
2572 wait_queue_entry_t wait;
2573 struct ksock_conn *conn;
2574 struct ksock_sched *sched;
2575 LIST_HEAD(enomem_conns);
2580 time64_t deadline = ktime_get_seconds();
2582 init_waitqueue_entry(&wait, current);
2584 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2586 while (!ksocknal_data.ksnd_shuttingdown) {
2587 if (!list_empty(&ksocknal_data.ksnd_deathrow_conns)) {
2588 conn = list_entry(ksocknal_data.ksnd_deathrow_conns.next,
2589 struct ksock_conn, ksnc_list);
2590 list_del(&conn->ksnc_list);
2592 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2594 ksocknal_terminate_conn(conn);
2595 ksocknal_conn_decref(conn);
2597 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2601 if (!list_empty(&ksocknal_data.ksnd_zombie_conns)) {
2602 conn = list_entry(ksocknal_data.ksnd_zombie_conns.next,
2603 struct ksock_conn, ksnc_list);
2604 list_del(&conn->ksnc_list);
2606 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2608 ksocknal_destroy_conn(conn);
2610 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2614 list_splice_init(&ksocknal_data.ksnd_enomem_conns,
2617 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2619 /* reschedule all the connections that stalled with ENOMEM... */
2621 while (!list_empty(&enomem_conns)) {
2622 conn = list_entry(enomem_conns.next,
2623 struct ksock_conn, ksnc_tx_list);
2624 list_del(&conn->ksnc_tx_list);
2626 sched = conn->ksnc_scheduler;
2628 spin_lock_bh(&sched->kss_lock);
2630 LASSERT(conn->ksnc_tx_scheduled);
2631 conn->ksnc_tx_ready = 1;
2632 list_add_tail(&conn->ksnc_tx_list,
2633 &sched->kss_tx_conns);
2634 wake_up(&sched->kss_waitq);
2636 spin_unlock_bh(&sched->kss_lock);
2640 /* careful with the jiffy wrap... */
2641 while ((timeout = deadline - ktime_get_seconds()) <= 0) {
2644 int chunk = HASH_SIZE(ksocknal_data.ksnd_peers);
2645 unsigned int lnd_timeout;
2647 /* Time to check for timeouts on a few more peers: I
2648 * do checks every 'p' seconds on a proportion of the
2649 * peer_ni table and I need to check every connection
2650 * 'n' times within a timeout interval, to ensure I
2651 * detect a timeout on any connection within (n+1)/n
2652 * times the timeout interval.
2655 lnd_timeout = ksocknal_timeout();
2656 if (lnd_timeout > n * p)
2657 chunk = (chunk * n * p) / lnd_timeout;
2661 for (i = 0; i < chunk; i++) {
2662 ksocknal_check_peer_timeouts(peer_index);
2663 peer_index = (peer_index + 1) %
2664 HASH_SIZE(ksocknal_data.ksnd_peers);
2670 if (nenomem_conns != 0) {
2671 /* Reduce my timeout if I rescheduled ENOMEM conns.
2672 * This also prevents me getting woken immediately
2673 * if any go back on my enomem list. */
2674 timeout = SOCKNAL_ENOMEM_RETRY;
2676 ksocknal_data.ksnd_reaper_waketime = ktime_get_seconds() +
2679 set_current_state(TASK_INTERRUPTIBLE);
2680 add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2682 if (!ksocknal_data.ksnd_shuttingdown &&
2683 list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
2684 list_empty(&ksocknal_data.ksnd_zombie_conns))
2685 schedule_timeout(cfs_time_seconds(timeout));
2687 set_current_state(TASK_RUNNING);
2688 remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2690 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2693 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2695 ksocknal_thread_fini();