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>
29 #include <linux/sunrpc/addr.h>
32 ksocknal_alloc_tx(int type, int size)
34 struct ksock_tx *tx = NULL;
36 if (type == KSOCK_MSG_NOOP) {
37 LASSERT(size == KSOCK_NOOP_TX_SIZE);
39 /* searching for a noop tx in free list */
40 spin_lock(&ksocknal_data.ksnd_tx_lock);
42 tx = list_first_entry_or_null(&ksocknal_data.ksnd_idle_noop_txs,
43 struct ksock_tx, tx_list);
45 LASSERT(tx->tx_desc_size == size);
46 list_del(&tx->tx_list);
49 spin_unlock(&ksocknal_data.ksnd_tx_lock);
53 LIBCFS_ALLOC(tx, size);
58 refcount_set(&tx->tx_refcount, 1);
59 tx->tx_zc_aborted = 0;
60 tx->tx_zc_capable = 0;
61 tx->tx_zc_checked = 0;
62 tx->tx_hstatus = LNET_MSG_STATUS_OK;
63 tx->tx_desc_size = size;
65 atomic_inc(&ksocknal_data.ksnd_nactive_txs);
71 ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
75 tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
77 CERROR("Can't allocate noop tx desc\n");
82 tx->tx_lnetmsg = NULL;
86 tx->tx_nonblk = nonblk;
88 tx->tx_msg.ksm_csum = 0;
89 tx->tx_msg.ksm_type = KSOCK_MSG_NOOP;
90 tx->tx_msg.ksm_zc_cookies[0] = 0;
91 tx->tx_msg.ksm_zc_cookies[1] = cookie;
98 ksocknal_free_tx(struct ksock_tx *tx)
100 atomic_dec(&ksocknal_data.ksnd_nactive_txs);
102 if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
104 spin_lock(&ksocknal_data.ksnd_tx_lock);
106 list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
108 spin_unlock(&ksocknal_data.ksnd_tx_lock);
110 LIBCFS_FREE(tx, tx->tx_desc_size);
115 ksocknal_send_hdr(struct ksock_conn *conn, struct ksock_tx *tx,
116 struct kvec *scratch_iov)
118 struct kvec *iov = &tx->tx_hdr;
122 LASSERT(tx->tx_niov > 0);
124 /* Never touch tx->tx_hdr inside ksocknal_lib_send_hdr() */
125 rc = ksocknal_lib_send_hdr(conn, tx, scratch_iov);
127 if (rc <= 0) /* sent nothing? */
131 LASSERT(nob <= tx->tx_resid);
135 LASSERT(tx->tx_niov == 1);
137 if (nob < (int) iov->iov_len) {
138 iov->iov_base += nob;
143 LASSERT(nob == iov->iov_len);
150 ksocknal_send_kiov(struct ksock_conn *conn, struct ksock_tx *tx,
151 struct kvec *scratch_iov)
153 struct bio_vec *kiov = tx->tx_kiov;
157 LASSERT(tx->tx_niov == 0);
158 LASSERT(tx->tx_nkiov > 0);
160 /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
161 rc = ksocknal_lib_send_kiov(conn, tx, scratch_iov);
163 if (rc <= 0) /* sent nothing? */
167 LASSERT(nob <= tx->tx_resid);
172 LASSERT(tx->tx_nkiov > 0);
174 if (nob < (int)kiov->bv_len) {
175 kiov->bv_offset += nob;
180 nob -= (int)kiov->bv_len;
181 tx->tx_kiov = ++kiov;
189 ksocknal_transmit(struct ksock_conn *conn, struct ksock_tx *tx,
190 struct kvec *scratch_iov)
195 if (ksocknal_data.ksnd_stall_tx != 0)
196 schedule_timeout_uninterruptible(
197 cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
199 LASSERT(tx->tx_resid != 0);
201 rc = ksocknal_connsock_addref(conn);
203 LASSERT(conn->ksnc_closing);
208 if (ksocknal_data.ksnd_enomem_tx > 0) {
210 ksocknal_data.ksnd_enomem_tx--;
212 } else if (tx->tx_niov != 0) {
213 rc = ksocknal_send_hdr(conn, tx, scratch_iov);
215 rc = ksocknal_send_kiov(conn, tx, scratch_iov);
218 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
219 if (rc > 0) /* sent something? */
220 conn->ksnc_tx_bufnob += rc; /* account it */
222 if (bufnob < conn->ksnc_tx_bufnob) {
223 /* allocated send buffer bytes < computed; infer
224 * something got ACKed */
225 conn->ksnc_tx_deadline = ktime_get_seconds() +
227 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
228 conn->ksnc_tx_bufnob = bufnob;
232 if (rc <= 0) { /* Didn't write anything? */
233 /* some stacks return 0 instead of -EAGAIN */
237 /* Check if EAGAIN is due to memory pressure */
238 if (rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
244 /* socket's wmem_queued now includes 'rc' bytes */
245 atomic_sub (rc, &conn->ksnc_tx_nob);
248 } while (tx->tx_resid != 0);
250 ksocknal_connsock_decref(conn);
255 ksocknal_recv_iov(struct ksock_conn *conn, struct kvec *scratchiov)
257 struct kvec *iov = conn->ksnc_rx_iov;
261 LASSERT(conn->ksnc_rx_niov > 0);
263 /* Never touch conn->ksnc_rx_iov or change connection
264 * status inside ksocknal_lib_recv_iov */
265 rc = ksocknal_lib_recv_iov(conn, scratchiov);
270 /* received something... */
273 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
274 conn->ksnc_rx_deadline = ktime_get_seconds() +
276 smp_mb(); /* order with setting rx_started */
277 conn->ksnc_rx_started = 1;
279 conn->ksnc_rx_nob_wanted -= nob;
280 conn->ksnc_rx_nob_left -= nob;
283 LASSERT(conn->ksnc_rx_niov > 0);
285 if (nob < (int)iov->iov_len) {
287 iov->iov_base += nob;
292 conn->ksnc_rx_iov = ++iov;
293 conn->ksnc_rx_niov--;
300 ksocknal_recv_kiov(struct ksock_conn *conn, struct page **rx_scratch_pgs,
301 struct kvec *scratch_iov)
303 struct bio_vec *kiov = conn->ksnc_rx_kiov;
306 LASSERT(conn->ksnc_rx_nkiov > 0);
308 /* Never touch conn->ksnc_rx_kiov or change connection
309 * status inside ksocknal_lib_recv_iov */
310 rc = ksocknal_lib_recv_kiov(conn, rx_scratch_pgs, scratch_iov);
315 /* received something... */
318 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
319 conn->ksnc_rx_deadline = ktime_get_seconds() +
321 smp_mb(); /* order with setting rx_started */
322 conn->ksnc_rx_started = 1;
324 conn->ksnc_rx_nob_wanted -= nob;
325 conn->ksnc_rx_nob_left -= nob;
328 LASSERT(conn->ksnc_rx_nkiov > 0);
330 if (nob < (int) kiov->bv_len) {
331 kiov->bv_offset += nob;
337 conn->ksnc_rx_kiov = ++kiov;
338 conn->ksnc_rx_nkiov--;
345 ksocknal_receive(struct ksock_conn *conn, struct page **rx_scratch_pgs,
346 struct kvec *scratch_iov)
348 /* Return 1 on success, 0 on EOF, < 0 on error.
349 * Caller checks ksnc_rx_nob_wanted to determine
350 * progress/completion. */
354 if (ksocknal_data.ksnd_stall_rx != 0)
355 schedule_timeout_uninterruptible(
356 cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
358 rc = ksocknal_connsock_addref(conn);
360 LASSERT(conn->ksnc_closing);
365 if (conn->ksnc_rx_niov != 0)
366 rc = ksocknal_recv_iov(conn, scratch_iov);
368 rc = ksocknal_recv_kiov(conn, rx_scratch_pgs,
372 /* error/EOF or partial receive */
375 } else if (rc == 0 && conn->ksnc_rx_started) {
376 /* EOF in the middle of a message */
382 /* Completed a fragment */
384 if (conn->ksnc_rx_nob_wanted == 0) {
390 ksocknal_connsock_decref(conn);
395 ksocknal_tx_done(struct lnet_ni *ni, struct ksock_tx *tx, int rc)
397 struct lnet_msg *lnetmsg = tx->tx_lnetmsg;
398 enum lnet_msg_hstatus hstatus = tx->tx_hstatus;
401 LASSERT(ni != NULL || tx->tx_conn != NULL);
403 if (!rc && (tx->tx_resid != 0 || tx->tx_zc_aborted)) {
405 if (hstatus == LNET_MSG_STATUS_OK)
406 hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
409 if (tx->tx_conn != NULL)
410 ksocknal_conn_decref(tx->tx_conn);
412 ksocknal_free_tx(tx);
413 if (lnetmsg != NULL) { /* KSOCK_MSG_NOOP go without lnetmsg */
414 lnetmsg->msg_health_status = hstatus;
415 lnet_finalize(lnetmsg, rc);
422 ksocknal_txlist_done(struct lnet_ni *ni, struct list_head *txlist, int error)
426 while ((tx = list_first_entry_or_null(txlist, struct ksock_tx,
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 %pIS reset our connection while we were sending data; it may have rebooted.\n",
612 &conn->ksnc_peeraddr);
615 LCONSOLE_WARN("There was an unexpected network error while writing to %pIS: %d.\n",
616 &conn->ksnc_peeraddr, rc);
619 CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pISp\n",
620 conn, rc, libcfs_idstr(&conn->ksnc_peer->ksnp_id),
621 &conn->ksnc_peeraddr);
624 if (tx->tx_zc_checked)
625 ksocknal_uncheck_zc_req(tx);
627 /* it's not an error if conn is being closed */
628 ksocknal_close_conn_and_siblings(conn,
629 (conn->ksnc_closing) ? 0 : rc);
635 ksocknal_launch_connection_locked(struct ksock_conn_cb *conn_cb)
637 /* called holding write lock on ksnd_global_lock */
639 LASSERT(!conn_cb->ksnr_scheduled);
640 LASSERT(!conn_cb->ksnr_connecting);
641 LASSERT((ksocknal_conn_cb_mask() & ~conn_cb->ksnr_connected) != 0);
643 /* scheduling conn for connd */
644 conn_cb->ksnr_scheduled = 1;
646 /* extra ref for connd */
647 ksocknal_conn_cb_addref(conn_cb);
649 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
651 list_add_tail(&conn_cb->ksnr_connd_list,
652 &ksocknal_data.ksnd_connd_routes);
653 wake_up(&ksocknal_data.ksnd_connd_waitq);
655 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
659 ksocknal_launch_all_connections_locked(struct ksock_peer_ni *peer_ni)
661 struct ksock_conn_cb *conn_cb;
663 /* called holding write lock on ksnd_global_lock */
665 /* launch any/all connections that need it */
666 conn_cb = ksocknal_find_connectable_conn_cb_locked(peer_ni);
670 ksocknal_launch_connection_locked(conn_cb);
675 ksocknal_find_conn_locked(struct ksock_peer_ni *peer_ni, struct ksock_tx *tx, int nonblk)
677 struct ksock_conn *c;
678 struct ksock_conn *conn;
679 struct ksock_conn *typed = NULL;
680 struct ksock_conn *fallback = NULL;
684 list_for_each_entry(c, &peer_ni->ksnp_conns, ksnc_list) {
685 int nob = atomic_read(&c->ksnc_tx_nob) +
686 c->ksnc_sock->sk->sk_wmem_queued;
689 LASSERT (!c->ksnc_closing);
690 LASSERT (c->ksnc_proto != NULL &&
691 c->ksnc_proto->pro_match_tx != NULL);
693 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
698 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
701 case SOCKNAL_MATCH_YES: /* typed connection */
702 if (typed == NULL || tnob > nob ||
703 (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
704 typed->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
710 case SOCKNAL_MATCH_MAY: /* fallback connection */
711 if (fallback == NULL || fnob > nob ||
712 (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
713 fallback->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
721 /* prefer the typed selection */
722 conn = (typed != NULL) ? typed : fallback;
725 conn->ksnc_tx_last_post = ktime_get_seconds();
731 ksocknal_tx_prep(struct ksock_conn *conn, struct ksock_tx *tx)
733 conn->ksnc_proto->pro_pack(tx);
735 atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
736 ksocknal_conn_addref(conn); /* +1 ref for tx */
741 ksocknal_queue_tx_locked(struct ksock_tx *tx, struct ksock_conn *conn)
743 struct ksock_sched *sched = conn->ksnc_scheduler;
744 struct ksock_msg *msg = &tx->tx_msg;
745 struct ksock_tx *ztx = NULL;
748 /* called holding global lock (read or irq-write) and caller may
749 * not have dropped this lock between finding conn and calling me,
750 * so we don't need the {get,put}connsock dance to deref
752 LASSERT(!conn->ksnc_closing);
754 CDEBUG(D_NET, "Sending to %s ip %pISp\n",
755 libcfs_idstr(&conn->ksnc_peer->ksnp_id),
756 &conn->ksnc_peeraddr);
758 ksocknal_tx_prep(conn, tx);
760 /* Ensure the frags we've been given EXACTLY match the number of
761 * bytes we want to send. Many TCP/IP stacks disregard any total
762 * size parameters passed to them and just look at the frags.
764 * We always expect at least 1 mapped fragment containing the
765 * complete ksocknal message header.
767 LASSERT(lnet_iov_nob(tx->tx_niov, &tx->tx_hdr) +
768 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
769 (unsigned int)tx->tx_nob);
770 LASSERT(tx->tx_niov >= 1);
771 LASSERT(tx->tx_resid == tx->tx_nob);
773 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
774 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
776 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
778 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
779 spin_lock_bh(&sched->kss_lock);
781 if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
782 /* First packet starts the timeout */
783 conn->ksnc_tx_deadline = ktime_get_seconds() +
785 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
786 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
787 conn->ksnc_tx_bufnob = 0;
788 smp_mb(); /* order with adding to tx_queue */
791 if (msg->ksm_type == KSOCK_MSG_NOOP) {
792 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
793 * on a normal packet so I don't need to send it */
794 LASSERT (msg->ksm_zc_cookies[1] != 0);
795 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
797 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
798 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
801 /* It's a normal packet - can it piggback a noop zc-ack that
802 * has been queued already? */
803 LASSERT (msg->ksm_zc_cookies[1] == 0);
804 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
806 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
807 /* ztx will be released later */
811 atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
812 list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
815 if (conn->ksnc_tx_ready && /* able to send */
816 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
817 /* +1 ref for scheduler */
818 ksocknal_conn_addref(conn);
819 list_add_tail(&conn->ksnc_tx_list,
820 &sched->kss_tx_conns);
821 conn->ksnc_tx_scheduled = 1;
822 wake_up(&sched->kss_waitq);
825 spin_unlock_bh(&sched->kss_lock);
829 struct ksock_conn_cb *
830 ksocknal_find_connectable_conn_cb_locked(struct ksock_peer_ni *peer_ni)
832 time64_t now = ktime_get_seconds();
833 struct ksock_conn_cb *conn_cb;
835 conn_cb = peer_ni->ksnp_conn_cb;
839 LASSERT(!conn_cb->ksnr_connecting || conn_cb->ksnr_scheduled);
841 if (conn_cb->ksnr_scheduled) /* connections being established */
844 /* all conn types connected ? */
845 if ((ksocknal_conn_cb_mask() & ~conn_cb->ksnr_connected) == 0)
848 if (!(conn_cb->ksnr_retry_interval == 0 || /* first attempt */
849 now >= conn_cb->ksnr_timeout)) {
851 "Too soon to retry route %pIS (cnted %d, interval %lld, %lld secs later)\n",
853 conn_cb->ksnr_connected,
854 conn_cb->ksnr_retry_interval,
855 conn_cb->ksnr_timeout - now);
862 struct ksock_conn_cb *
863 ksocknal_find_connecting_conn_cb_locked(struct ksock_peer_ni *peer_ni)
865 struct ksock_conn_cb *conn_cb;
867 conn_cb = peer_ni->ksnp_conn_cb;
871 LASSERT(!conn_cb->ksnr_connecting || conn_cb->ksnr_scheduled);
873 return conn_cb->ksnr_scheduled ? conn_cb : NULL;
877 ksocknal_launch_packet(struct lnet_ni *ni, struct ksock_tx *tx,
878 struct lnet_processid *id)
880 struct ksock_peer_ni *peer_ni;
881 struct ksock_conn *conn;
882 struct sockaddr_in sa;
887 LASSERT(tx->tx_conn == NULL);
889 g_lock = &ksocknal_data.ksnd_global_lock;
891 for (retry = 0;; retry = 1) {
893 peer_ni = ksocknal_find_peer_locked(ni, id);
894 if (peer_ni != NULL) {
895 if (ksocknal_find_connectable_conn_cb_locked(peer_ni) == NULL) {
896 conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
898 /* I've got nothing that need to be
899 * connecting and I do have an actual
902 ksocknal_queue_tx_locked(tx, conn);
909 /* I'll need a write lock... */
912 write_lock_bh(g_lock);
914 peer_ni = ksocknal_find_peer_locked(ni, id);
918 write_unlock_bh(g_lock);
920 if ((id->pid & LNET_PID_USERFLAG) != 0) {
921 CERROR("Refusing to create a connection to userspace process %s\n",
923 return -EHOSTUNREACH;
927 CERROR("Can't find peer_ni %s\n", libcfs_idstr(id));
928 return -EHOSTUNREACH;
931 memset(&sa, 0, sizeof(sa));
932 sa.sin_family = AF_INET;
933 sa.sin_addr.s_addr = id->nid.nid_addr[0];
934 sa.sin_port = htons(lnet_acceptor_port());
936 struct lnet_process_id id4 = {
938 .nid = lnet_nid_to_nid4(&id->nid),
940 rc = ksocknal_add_peer(ni, id4, (struct sockaddr *)&sa);
943 CERROR("Can't add peer_ni %s: %d\n",
944 libcfs_idstr(id), rc);
949 ksocknal_launch_all_connections_locked(peer_ni);
951 conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
953 /* Connection exists; queue message on it */
954 ksocknal_queue_tx_locked (tx, conn);
955 write_unlock_bh(g_lock);
959 if (peer_ni->ksnp_accepting > 0 ||
960 ksocknal_find_connecting_conn_cb_locked(peer_ni) != NULL) {
961 /* the message is going to be pinned to the peer_ni */
962 tx->tx_deadline = ktime_get_seconds() +
965 /* Queue the message until a connection is established */
966 list_add_tail(&tx->tx_list, &peer_ni->ksnp_tx_queue);
967 write_unlock_bh(g_lock);
971 write_unlock_bh(g_lock);
973 /* NB Routes may be ignored if connections to them failed recently */
974 CNETERR("No usable routes to %s\n", libcfs_idstr(id));
975 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
976 return (-EHOSTUNREACH);
980 ksocknal_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
982 /* '1' for consistency with code that checks !mpflag to restore */
983 unsigned int mpflag = 1;
984 int type = lntmsg->msg_type;
985 struct lnet_processid *target = &lntmsg->msg_target;
986 unsigned int payload_niov = lntmsg->msg_niov;
987 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
988 unsigned int payload_offset = lntmsg->msg_offset;
989 unsigned int payload_nob = lntmsg->msg_len;
994 /* NB 'private' is different depending on what we're sending.
998 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
999 payload_nob, payload_niov, libcfs_idstr(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_fini (void)
1057 if (atomic_dec_and_test(&ksocknal_data.ksnd_nthreads))
1058 wake_up_var(&ksocknal_data.ksnd_nthreads);
1062 ksocknal_new_packet(struct ksock_conn *conn, int nob_to_skip)
1064 static char ksocknal_slop_buffer[4096];
1069 LASSERT(conn->ksnc_proto != NULL);
1071 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1072 /* Remind the socket to ack eagerly... */
1073 ksocknal_lib_eager_ack(conn);
1076 if (nob_to_skip == 0) { /* right at next packet boundary now */
1077 conn->ksnc_rx_started = 0;
1078 smp_mb(); /* racing with timeout thread */
1080 switch (conn->ksnc_proto->pro_version) {
1081 case KSOCK_PROTO_V2:
1082 case KSOCK_PROTO_V3:
1083 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1084 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1085 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1087 conn->ksnc_rx_nob_wanted = offsetof(struct ksock_msg, ksm_u);
1088 conn->ksnc_rx_nob_left = offsetof(struct ksock_msg, ksm_u);
1089 conn->ksnc_rx_iov[0].iov_len = offsetof(struct ksock_msg, ksm_u);
1092 case KSOCK_PROTO_V1:
1093 /* Receiving bare struct lnet_hdr */
1094 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1095 conn->ksnc_rx_nob_wanted = sizeof(struct lnet_hdr);
1096 conn->ksnc_rx_nob_left = sizeof(struct lnet_hdr);
1098 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1099 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1100 conn->ksnc_rx_iov[0].iov_len = sizeof(struct lnet_hdr);
1106 conn->ksnc_rx_niov = 1;
1108 conn->ksnc_rx_kiov = NULL;
1109 conn->ksnc_rx_nkiov = 0;
1110 conn->ksnc_rx_csum = ~0;
1114 /* Set up to skip as much as possible now. If there's more left
1115 * (ran out of iov entries) we'll get called again */
1117 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1118 conn->ksnc_rx_nob_left = nob_to_skip;
1119 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1124 nob = min_t(int, nob_to_skip, sizeof(ksocknal_slop_buffer));
1126 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1127 conn->ksnc_rx_iov[niov].iov_len = nob;
1132 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1133 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof(struct kvec));
1135 conn->ksnc_rx_niov = niov;
1136 conn->ksnc_rx_kiov = NULL;
1137 conn->ksnc_rx_nkiov = 0;
1138 conn->ksnc_rx_nob_wanted = skipped;
1143 ksocknal_process_receive(struct ksock_conn *conn,
1144 struct page **rx_scratch_pgs,
1145 struct kvec *scratch_iov)
1147 struct lnet_hdr *lhdr;
1148 struct lnet_processid *id;
1151 LASSERT(refcount_read(&conn->ksnc_conn_refcount) > 0);
1153 /* NB: sched lock NOT held */
1154 /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
1155 LASSERT(conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1156 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1157 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1158 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1160 if (conn->ksnc_rx_nob_wanted != 0) {
1161 rc = ksocknal_receive(conn, rx_scratch_pgs,
1165 struct lnet_processid *ksnp_id;
1167 ksnp_id = &conn->ksnc_peer->ksnp_id;
1169 LASSERT(rc != -EAGAIN);
1171 CDEBUG(D_NET, "[%p] EOF from %s ip %pISp\n",
1172 conn, libcfs_idstr(ksnp_id),
1173 &conn->ksnc_peeraddr);
1174 else if (!conn->ksnc_closing)
1175 CERROR("[%p] Error %d on read from %s ip %pISp\n",
1176 conn, rc, libcfs_idstr(ksnp_id),
1177 &conn->ksnc_peeraddr);
1179 /* it's not an error if conn is being closed */
1180 ksocknal_close_conn_and_siblings (conn,
1181 (conn->ksnc_closing) ? 0 : rc);
1182 return (rc == 0 ? -ESHUTDOWN : rc);
1185 if (conn->ksnc_rx_nob_wanted != 0) {
1190 switch (conn->ksnc_rx_state) {
1191 case SOCKNAL_RX_KSM_HEADER:
1192 if (conn->ksnc_flip) {
1193 __swab32s(&conn->ksnc_msg.ksm_type);
1194 __swab32s(&conn->ksnc_msg.ksm_csum);
1195 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1196 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1199 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1200 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1201 CERROR("%s: Unknown message type: %x\n",
1202 libcfs_idstr(&conn->ksnc_peer->ksnp_id),
1203 conn->ksnc_msg.ksm_type);
1204 ksocknal_new_packet(conn, 0);
1205 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1209 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1210 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1211 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1212 /* NOOP Checksum error */
1213 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1214 libcfs_idstr(&conn->ksnc_peer->ksnp_id),
1215 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1216 ksocknal_new_packet(conn, 0);
1217 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1221 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1224 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1226 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1227 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1229 rc = conn->ksnc_proto->pro_handle_zcack(
1230 conn, cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1233 CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
1234 libcfs_idstr(&conn->ksnc_peer->ksnp_id),
1236 conn->ksnc_msg.ksm_zc_cookies[1]);
1237 ksocknal_new_packet(conn, 0);
1238 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1243 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1244 ksocknal_new_packet(conn, 0);
1245 return 0; /* NOOP is done and just return */
1248 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1249 conn->ksnc_rx_nob_wanted = sizeof(struct ksock_lnet_msg);
1250 conn->ksnc_rx_nob_left = sizeof(struct ksock_lnet_msg);
1252 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1253 conn->ksnc_rx_iov[0].iov_base =
1254 (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1255 conn->ksnc_rx_iov[0].iov_len = sizeof(struct ksock_lnet_msg);
1257 conn->ksnc_rx_niov = 1;
1258 conn->ksnc_rx_kiov = NULL;
1259 conn->ksnc_rx_nkiov = 0;
1261 goto again; /* read lnet header now */
1263 case SOCKNAL_RX_LNET_HEADER:
1264 /* unpack message header */
1265 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1267 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1268 /* Userspace peer_ni */
1269 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1270 id = &conn->ksnc_peer->ksnp_id;
1272 /* Substitute process ID assigned at connection time */
1273 lhdr->src_pid = cpu_to_le32(id->pid);
1274 lhdr->src_nid = cpu_to_le64(lnet_nid_to_nid4(&id->nid));
1277 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1278 ksocknal_conn_addref(conn); /* ++ref while parsing */
1280 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1281 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1282 lnet_nid_to_nid4(&conn->ksnc_peer->ksnp_id.nid),
1285 /* I just received garbage: give up on this conn */
1286 ksocknal_new_packet(conn, 0);
1287 ksocknal_close_conn_and_siblings(conn, rc);
1288 ksocknal_conn_decref(conn);
1292 /* I'm racing with ksocknal_recv() */
1293 LASSERT(conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1294 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1296 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1299 /* ksocknal_recv() got called */
1302 case SOCKNAL_RX_LNET_PAYLOAD:
1303 /* payload all received */
1306 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1307 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1308 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1309 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1310 libcfs_idstr(&conn->ksnc_peer->ksnp_id),
1311 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1315 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1316 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1318 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1319 id = &conn->ksnc_peer->ksnp_id;
1321 rc = conn->ksnc_proto->pro_handle_zcreq(
1323 conn->ksnc_msg.ksm_zc_cookies[0],
1324 *ksocknal_tunables.ksnd_nonblk_zcack ||
1325 le64_to_cpu(lhdr->src_nid) !=
1326 lnet_nid_to_nid4(&id->nid));
1329 if (rc && conn->ksnc_lnet_msg)
1330 conn->ksnc_lnet_msg->msg_health_status =
1331 LNET_MSG_STATUS_REMOTE_ERROR;
1332 lnet_finalize(conn->ksnc_lnet_msg, rc);
1335 ksocknal_new_packet(conn, 0);
1336 ksocknal_close_conn_and_siblings(conn, rc);
1341 case SOCKNAL_RX_SLOP:
1342 /* starting new packet? */
1343 if (ksocknal_new_packet(conn, conn->ksnc_rx_nob_left))
1344 return 0; /* come back later */
1345 goto again; /* try to finish reading slop now */
1353 return (-EINVAL); /* keep gcc happy */
1357 ksocknal_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
1358 int delayed, unsigned int niov,
1359 struct bio_vec *kiov, unsigned int offset, unsigned int mlen,
1362 struct ksock_conn *conn = private;
1363 struct ksock_sched *sched = conn->ksnc_scheduler;
1365 LASSERT (mlen <= rlen);
1366 LASSERT (niov <= LNET_MAX_IOV);
1368 conn->ksnc_lnet_msg = msg;
1369 conn->ksnc_rx_nob_wanted = mlen;
1370 conn->ksnc_rx_nob_left = rlen;
1373 conn->ksnc_rx_nkiov = 0;
1374 conn->ksnc_rx_kiov = NULL;
1375 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1376 conn->ksnc_rx_niov = 0;
1378 conn->ksnc_rx_niov = 0;
1379 conn->ksnc_rx_iov = NULL;
1380 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1381 conn->ksnc_rx_nkiov =
1382 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1383 niov, kiov, offset, mlen);
1387 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1388 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1390 LASSERT (conn->ksnc_rx_scheduled);
1392 spin_lock_bh(&sched->kss_lock);
1394 switch (conn->ksnc_rx_state) {
1395 case SOCKNAL_RX_PARSE_WAIT:
1396 list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1397 wake_up(&sched->kss_waitq);
1398 LASSERT(conn->ksnc_rx_ready);
1401 case SOCKNAL_RX_PARSE:
1402 /* scheduler hasn't noticed I'm parsing yet */
1406 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1408 spin_unlock_bh(&sched->kss_lock);
1409 ksocknal_conn_decref(conn);
1414 ksocknal_sched_cansleep(struct ksock_sched *sched)
1418 spin_lock_bh(&sched->kss_lock);
1420 rc = (!ksocknal_data.ksnd_shuttingdown &&
1421 list_empty(&sched->kss_rx_conns) &&
1422 list_empty(&sched->kss_tx_conns));
1424 spin_unlock_bh(&sched->kss_lock);
1428 int ksocknal_scheduler(void *arg)
1430 struct ksock_sched *sched;
1431 struct ksock_conn *conn;
1432 struct ksock_tx *tx;
1434 long id = (long)arg;
1435 struct page **rx_scratch_pgs;
1436 struct kvec *scratch_iov;
1438 sched = ksocknal_data.ksnd_schedulers[KSOCK_THREAD_CPT(id)];
1440 LIBCFS_CPT_ALLOC(rx_scratch_pgs, lnet_cpt_table(), sched->kss_cpt,
1441 sizeof(*rx_scratch_pgs) * LNET_MAX_IOV);
1442 if (!rx_scratch_pgs) {
1443 CERROR("Unable to allocate scratch pages\n");
1447 LIBCFS_CPT_ALLOC(scratch_iov, lnet_cpt_table(), sched->kss_cpt,
1448 sizeof(*scratch_iov) * LNET_MAX_IOV);
1450 CERROR("Unable to allocate scratch iov\n");
1454 rc = cfs_cpt_bind(lnet_cpt_table(), sched->kss_cpt);
1456 CWARN("Can't set CPU partition affinity to %d: %d\n",
1457 sched->kss_cpt, rc);
1460 spin_lock_bh(&sched->kss_lock);
1462 while (!ksocknal_data.ksnd_shuttingdown) {
1463 bool did_something = false;
1465 /* Ensure I progress everything semi-fairly */
1466 conn = list_first_entry_or_null(&sched->kss_rx_conns,
1470 list_del(&conn->ksnc_rx_list);
1472 LASSERT(conn->ksnc_rx_scheduled);
1473 LASSERT(conn->ksnc_rx_ready);
1475 /* clear rx_ready in case receive isn't complete.
1476 * Do it BEFORE we call process_recv, since
1477 * data_ready can set it any time after we release
1479 conn->ksnc_rx_ready = 0;
1480 spin_unlock_bh(&sched->kss_lock);
1482 rc = ksocknal_process_receive(conn, rx_scratch_pgs,
1485 spin_lock_bh(&sched->kss_lock);
1487 /* I'm the only one that can clear this flag */
1488 LASSERT(conn->ksnc_rx_scheduled);
1490 /* Did process_receive get everything it wanted? */
1492 conn->ksnc_rx_ready = 1;
1494 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1495 /* Conn blocked waiting for ksocknal_recv()
1496 * I change its state (under lock) to signal
1497 * it can be rescheduled */
1498 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1499 } else if (conn->ksnc_rx_ready) {
1500 /* reschedule for rx */
1501 list_add_tail(&conn->ksnc_rx_list,
1502 &sched->kss_rx_conns);
1504 conn->ksnc_rx_scheduled = 0;
1506 ksocknal_conn_decref(conn);
1509 did_something = true;
1512 if (!list_empty(&sched->kss_tx_conns)) {
1515 list_splice_init(&sched->kss_zombie_noop_txs, &zlist);
1517 conn = list_first_entry(&sched->kss_tx_conns,
1520 list_del(&conn->ksnc_tx_list);
1522 LASSERT(conn->ksnc_tx_scheduled);
1523 LASSERT(conn->ksnc_tx_ready);
1524 LASSERT(!list_empty(&conn->ksnc_tx_queue));
1526 tx = list_first_entry(&conn->ksnc_tx_queue,
1527 struct ksock_tx, tx_list);
1529 if (conn->ksnc_tx_carrier == tx)
1530 ksocknal_next_tx_carrier(conn);
1532 /* dequeue now so empty list => more to send */
1533 list_del(&tx->tx_list);
1535 /* Clear tx_ready in case send isn't complete. Do
1536 * it BEFORE we call process_transmit, since
1537 * write_space can set it any time after we release
1539 conn->ksnc_tx_ready = 0;
1540 spin_unlock_bh(&sched->kss_lock);
1542 if (!list_empty(&zlist)) {
1543 /* free zombie noop txs, it's fast because
1544 * noop txs are just put in freelist */
1545 ksocknal_txlist_done(NULL, &zlist, 0);
1548 rc = ksocknal_process_transmit(conn, tx, scratch_iov);
1550 if (rc == -ENOMEM || rc == -EAGAIN) {
1551 /* Incomplete send: replace tx on HEAD of tx_queue */
1552 spin_lock_bh(&sched->kss_lock);
1553 list_add(&tx->tx_list,
1554 &conn->ksnc_tx_queue);
1556 /* Complete send; tx -ref */
1557 ksocknal_tx_decref(tx);
1559 spin_lock_bh(&sched->kss_lock);
1560 /* assume space for more */
1561 conn->ksnc_tx_ready = 1;
1564 if (rc == -ENOMEM) {
1565 /* Do nothing; after a short timeout, this
1566 * conn will be reposted on kss_tx_conns. */
1567 } else if (conn->ksnc_tx_ready &&
1568 !list_empty(&conn->ksnc_tx_queue)) {
1569 /* reschedule for tx */
1570 list_add_tail(&conn->ksnc_tx_list,
1571 &sched->kss_tx_conns);
1573 conn->ksnc_tx_scheduled = 0;
1575 ksocknal_conn_decref(conn);
1578 did_something = true;
1580 if (!did_something || /* nothing to do */
1581 need_resched()) { /* hogging CPU? */
1582 spin_unlock_bh(&sched->kss_lock);
1584 if (!did_something) { /* wait for something to do */
1585 rc = wait_event_interruptible_exclusive(
1587 !ksocknal_sched_cansleep(sched));
1593 spin_lock_bh(&sched->kss_lock);
1597 spin_unlock_bh(&sched->kss_lock);
1598 CFS_FREE_PTR_ARRAY(rx_scratch_pgs, LNET_MAX_IOV);
1599 CFS_FREE_PTR_ARRAY(scratch_iov, LNET_MAX_IOV);
1600 ksocknal_thread_fini();
1605 * Add connection to kss_rx_conns of scheduler
1606 * and wakeup the scheduler.
1608 void ksocknal_read_callback(struct ksock_conn *conn)
1610 struct ksock_sched *sched;
1613 sched = conn->ksnc_scheduler;
1615 spin_lock_bh(&sched->kss_lock);
1617 conn->ksnc_rx_ready = 1;
1619 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1620 list_add_tail(&conn->ksnc_rx_list,
1621 &sched->kss_rx_conns);
1622 conn->ksnc_rx_scheduled = 1;
1623 /* extra ref for scheduler */
1624 ksocknal_conn_addref(conn);
1626 wake_up (&sched->kss_waitq);
1628 spin_unlock_bh(&sched->kss_lock);
1634 * Add connection to kss_tx_conns of scheduler
1635 * and wakeup the scheduler.
1637 void ksocknal_write_callback(struct ksock_conn *conn)
1639 struct ksock_sched *sched;
1642 sched = conn->ksnc_scheduler;
1644 spin_lock_bh(&sched->kss_lock);
1646 conn->ksnc_tx_ready = 1;
1648 if (!conn->ksnc_tx_scheduled && /* not being progressed */
1649 !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
1650 list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
1651 conn->ksnc_tx_scheduled = 1;
1652 /* extra ref for scheduler */
1653 ksocknal_conn_addref(conn);
1655 wake_up(&sched->kss_waitq);
1658 spin_unlock_bh(&sched->kss_lock);
1663 static const struct ksock_proto *
1664 ksocknal_parse_proto_version(struct ksock_hello_msg *hello)
1668 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1669 version = hello->kshm_version;
1670 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1671 version = __swab32(hello->kshm_version);
1674 #if SOCKNAL_VERSION_DEBUG
1675 if (*ksocknal_tunables.ksnd_protocol == 1)
1678 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1679 version == KSOCK_PROTO_V3)
1682 if (version == KSOCK_PROTO_V2)
1683 return &ksocknal_protocol_v2x;
1685 if (version == KSOCK_PROTO_V3)
1686 return &ksocknal_protocol_v3x;
1691 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1692 struct lnet_magicversion *hmv;
1694 BUILD_BUG_ON(sizeof(struct lnet_magicversion) !=
1695 offsetof(struct ksock_hello_msg, kshm_src_nid));
1697 hmv = (struct lnet_magicversion *)hello;
1699 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1700 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1701 return &ksocknal_protocol_v1x;
1708 ksocknal_send_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1709 lnet_nid_t peer_nid, struct ksock_hello_msg *hello)
1711 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1712 struct ksock_net *net = (struct ksock_net *)ni->ni_data;
1714 LASSERT(hello->kshm_nips <= LNET_INTERFACES_NUM);
1716 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1717 LASSERT(conn->ksnc_proto != NULL);
1719 hello->kshm_src_nid = lnet_nid_to_nid4(&ni->ni_nid);
1720 hello->kshm_dst_nid = peer_nid;
1721 hello->kshm_src_pid = the_lnet.ln_pid;
1723 hello->kshm_src_incarnation = net->ksnn_incarnation;
1724 hello->kshm_ctype = conn->ksnc_type;
1726 return conn->ksnc_proto->pro_send_hello(conn, hello);
1730 ksocknal_invert_type(int type)
1734 case SOCKLND_CONN_ANY:
1735 case SOCKLND_CONN_CONTROL:
1737 case SOCKLND_CONN_BULK_IN:
1738 return SOCKLND_CONN_BULK_OUT;
1739 case SOCKLND_CONN_BULK_OUT:
1740 return SOCKLND_CONN_BULK_IN;
1742 return (SOCKLND_CONN_NONE);
1747 ksocknal_recv_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1748 struct ksock_hello_msg *hello,
1749 struct lnet_process_id *peerid,
1752 /* Return < 0 fatal error
1754 * EALREADY lost connection race
1755 * EPROTO protocol version mismatch
1757 struct socket *sock = conn->ksnc_sock;
1758 int active = (conn->ksnc_proto != NULL);
1762 const struct ksock_proto *proto;
1763 struct lnet_process_id recv_id;
1765 /* socket type set on active connections - not set on passive */
1766 LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1768 timeout = active ? ksocknal_timeout() :
1769 lnet_acceptor_timeout();
1771 rc = lnet_sock_read(sock, &hello->kshm_magic,
1772 sizeof(hello->kshm_magic), timeout);
1774 CERROR("Error %d reading HELLO from %pIS\n",
1775 rc, &conn->ksnc_peeraddr);
1780 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1781 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1782 hello->kshm_magic != le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1783 /* Unexpected magic! */
1784 CERROR("Bad magic(1) %#08x (%#08x expected) from %pIS\n",
1785 __cpu_to_le32 (hello->kshm_magic),
1786 LNET_PROTO_TCP_MAGIC, &conn->ksnc_peeraddr);
1790 rc = lnet_sock_read(sock, &hello->kshm_version,
1791 sizeof(hello->kshm_version), timeout);
1793 CERROR("Error %d reading HELLO from %pIS\n",
1794 rc, &conn->ksnc_peeraddr);
1799 proto = ksocknal_parse_proto_version(hello);
1800 if (proto == NULL) {
1802 /* unknown protocol from peer_ni,
1803 * tell peer_ni my protocol.
1805 conn->ksnc_proto = &ksocknal_protocol_v3x;
1806 #if SOCKNAL_VERSION_DEBUG
1807 if (*ksocknal_tunables.ksnd_protocol == 2)
1808 conn->ksnc_proto = &ksocknal_protocol_v2x;
1809 else if (*ksocknal_tunables.ksnd_protocol == 1)
1810 conn->ksnc_proto = &ksocknal_protocol_v1x;
1812 hello->kshm_nips = 0;
1813 ksocknal_send_hello(ni, conn,
1814 lnet_nid_to_nid4(&ni->ni_nid),
1818 CERROR("Unknown protocol version (%d.x expected) from %pIS\n",
1819 conn->ksnc_proto->pro_version, &conn->ksnc_peeraddr);
1824 proto_match = (conn->ksnc_proto == proto);
1825 conn->ksnc_proto = proto;
1827 /* receive the rest of hello message anyway */
1828 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1830 CERROR("Error %d reading or checking hello from from %pIS\n",
1831 rc, &conn->ksnc_peeraddr);
1836 *incarnation = hello->kshm_src_incarnation;
1838 if (hello->kshm_src_nid == LNET_NID_ANY) {
1839 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY from %pIS\n",
1840 &conn->ksnc_peeraddr);
1845 rpc_get_port((struct sockaddr *)&conn->ksnc_peeraddr) >
1846 LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1847 /* Userspace NAL assigns peer_ni process ID from socket */
1848 recv_id.pid = rpc_get_port((struct sockaddr *)
1849 &conn->ksnc_peeraddr) |
1851 LASSERT(conn->ksnc_peeraddr.ss_family == AF_INET);
1852 recv_id.nid = LNET_MKNID(
1853 LNET_NID_NET(&ni->ni_nid),
1854 ntohl(((struct sockaddr_in *)
1855 &conn->ksnc_peeraddr)->sin_addr.s_addr));
1857 recv_id.nid = hello->kshm_src_nid;
1858 recv_id.pid = hello->kshm_src_pid;
1864 /* peer_ni determines type */
1865 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1866 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1867 CERROR("Unexpected type %d from %s ip %pIS\n",
1868 hello->kshm_ctype, libcfs_id2str(*peerid),
1869 &conn->ksnc_peeraddr);
1875 if (peerid->pid != recv_id.pid ||
1876 peerid->nid != recv_id.nid) {
1877 LCONSOLE_ERROR_MSG(0x130,
1878 "Connected successfully to %s on host %pIS, but they claimed they were %s; please check your Lustre configuration.\n",
1879 libcfs_id2str(*peerid),
1880 &conn->ksnc_peeraddr,
1881 libcfs_id2str(recv_id));
1885 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1886 /* Possible protocol mismatch or I lost the connection race */
1887 return proto_match ? EALREADY : EPROTO;
1890 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1891 CERROR("Mismatched types: me %d, %s ip %pIS %d\n",
1892 conn->ksnc_type, libcfs_id2str(*peerid),
1893 &conn->ksnc_peeraddr,
1901 ksocknal_connect(struct ksock_conn_cb *conn_cb)
1904 struct ksock_peer_ni *peer_ni = conn_cb->ksnr_peer;
1907 struct socket *sock;
1909 bool retry_later = false;
1912 deadline = ktime_get_seconds() + ksocknal_timeout();
1914 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1916 LASSERT(conn_cb->ksnr_scheduled);
1917 LASSERT(!conn_cb->ksnr_connecting);
1919 conn_cb->ksnr_connecting = 1;
1922 wanted = ksocknal_conn_cb_mask() & ~conn_cb->ksnr_connected;
1924 /* stop connecting if peer_ni/cb got closed under me, or
1925 * conn cb got connected while queued
1927 if (peer_ni->ksnp_closing || conn_cb->ksnr_deleted ||
1929 retry_later = false;
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_nidstr(&peer_ni->ksnp_id.nid),
1938 peer_ni->ksnp_accepting);
1942 if (retry_later) /* needs reschedule */
1945 if ((wanted & BIT(SOCKLND_CONN_ANY)) != 0) {
1946 type = SOCKLND_CONN_ANY;
1947 } else if ((wanted & BIT(SOCKLND_CONN_CONTROL)) != 0) {
1948 type = SOCKLND_CONN_CONTROL;
1949 } else if ((wanted & BIT(SOCKLND_CONN_BULK_IN)) != 0 &&
1950 conn_cb->ksnr_blki_conn_count <= conn_cb->ksnr_blko_conn_count) {
1951 type = SOCKLND_CONN_BULK_IN;
1953 LASSERT ((wanted & BIT(SOCKLND_CONN_BULK_OUT)) != 0);
1954 type = SOCKLND_CONN_BULK_OUT;
1957 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1959 if (ktime_get_seconds() >= deadline) {
1961 lnet_connect_console_error(
1962 rc, &peer_ni->ksnp_id.nid,
1963 (struct sockaddr *)&conn_cb->ksnr_addr);
1967 sock = lnet_connect(&peer_ni->ksnp_id.nid,
1968 conn_cb->ksnr_myiface,
1969 (struct sockaddr *)&conn_cb->ksnr_addr,
1970 peer_ni->ksnp_ni->ni_net_ns);
1976 rc = ksocknal_create_conn(peer_ni->ksnp_ni, conn_cb, sock,
1979 lnet_connect_console_error(
1980 rc, &peer_ni->ksnp_id.nid,
1981 (struct sockaddr *)&conn_cb->ksnr_addr);
1985 /* A +ve RC means I have to retry because I lost the connection
1986 * race or I have to renegotiate protocol version
1988 retry_later = (rc != 0);
1990 CDEBUG(D_NET, "peer_ni %s: conn race, retry later.\n",
1991 libcfs_nidstr(&peer_ni->ksnp_id.nid));
1993 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1996 conn_cb->ksnr_scheduled = 0;
1997 conn_cb->ksnr_connecting = 0;
2000 /* re-queue for attention; this frees me up to handle
2001 * the peer_ni's incoming connection request
2004 if (rc == EALREADY ||
2005 (rc == 0 && peer_ni->ksnp_accepting > 0)) {
2006 /* We want to introduce a delay before next
2007 * attempt to connect if we lost conn race, but
2008 * the race is resolved quickly usually, so
2009 * min_reconnectms should be good heuristic
2011 conn_cb->ksnr_retry_interval =
2012 *ksocknal_tunables.ksnd_min_reconnectms / 1000;
2013 conn_cb->ksnr_timeout = ktime_get_seconds() +
2014 conn_cb->ksnr_retry_interval;
2017 ksocknal_launch_connection_locked(conn_cb);
2020 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2024 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2026 conn_cb->ksnr_scheduled = 0;
2027 conn_cb->ksnr_connecting = 0;
2029 /* This is a retry rather than a new connection */
2030 conn_cb->ksnr_retry_interval *= 2;
2031 conn_cb->ksnr_retry_interval =
2032 max_t(time64_t, conn_cb->ksnr_retry_interval,
2033 *ksocknal_tunables.ksnd_min_reconnectms / 1000);
2034 conn_cb->ksnr_retry_interval =
2035 min_t(time64_t, conn_cb->ksnr_retry_interval,
2036 *ksocknal_tunables.ksnd_max_reconnectms / 1000);
2038 LASSERT(conn_cb->ksnr_retry_interval);
2039 conn_cb->ksnr_timeout = ktime_get_seconds() +
2040 conn_cb->ksnr_retry_interval;
2042 if (!list_empty(&peer_ni->ksnp_tx_queue) &&
2043 peer_ni->ksnp_accepting == 0 &&
2044 !ksocknal_find_connecting_conn_cb_locked(peer_ni)) {
2045 struct ksock_conn *conn;
2047 /* ksnp_tx_queue is queued on a conn on successful
2048 * connection for V1.x and V2.x
2050 conn = list_first_entry_or_null(&peer_ni->ksnp_conns,
2051 struct ksock_conn, ksnc_list);
2053 LASSERT(conn->ksnc_proto == &ksocknal_protocol_v3x);
2055 /* take all the blocked packets while I've got the lock and
2058 list_splice_init(&peer_ni->ksnp_tx_queue, &zombies);
2061 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2063 ksocknal_peer_failed(peer_ni);
2064 ksocknal_txlist_done(peer_ni->ksnp_ni, &zombies, rc);
2069 * check whether we need to create more connds.
2070 * It will try to create new thread if it's necessary, @timeout can
2071 * be updated if failed to create, so caller wouldn't keep try while
2072 * running out of resource.
2075 ksocknal_connd_check_start(time64_t sec, long *timeout)
2078 int total = ksocknal_data.ksnd_connd_starting +
2079 ksocknal_data.ksnd_connd_running;
2081 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2082 /* still in initializing */
2086 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2087 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2088 /* can't create more connd, or still have enough
2089 * threads to handle more connecting */
2093 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2094 /* no pending connecting request */
2098 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2099 /* may run out of resource, retry later */
2100 *timeout = cfs_time_seconds(1);
2104 if (ksocknal_data.ksnd_connd_starting > 0) {
2105 /* serialize starting to avoid flood */
2109 ksocknal_data.ksnd_connd_starting_stamp = sec;
2110 ksocknal_data.ksnd_connd_starting++;
2111 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2113 /* NB: total is the next id */
2114 rc = ksocknal_thread_start(ksocknal_connd, NULL,
2115 "socknal_cd%02d", total);
2117 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2122 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2123 ksocknal_data.ksnd_connd_starting--;
2124 ksocknal_data.ksnd_connd_failed_stamp = ktime_get_real_seconds();
2130 * check whether current thread can exit, it will return 1 if there are too
2131 * many threads and no creating in past 120 seconds.
2132 * Also, this function may update @timeout to make caller come back
2133 * again to recheck these conditions.
2136 ksocknal_connd_check_stop(time64_t sec, long *timeout)
2140 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2141 /* still in initializing */
2145 if (ksocknal_data.ksnd_connd_starting > 0) {
2146 /* in progress of starting new thread */
2150 if (ksocknal_data.ksnd_connd_running <=
2151 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2155 /* created thread in past 120 seconds? */
2156 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2157 SOCKNAL_CONND_TIMEOUT - sec);
2159 *timeout = (val > 0) ? cfs_time_seconds(val) :
2160 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2164 /* no creating in past 120 seconds */
2166 return ksocknal_data.ksnd_connd_running >
2167 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2170 /* Go through connd_cbs queue looking for a conn_cb that we can process
2171 * right now, @timeout_p can be updated if we need to come back later */
2172 static struct ksock_conn_cb *
2173 ksocknal_connd_get_conn_cb_locked(signed long *timeout_p)
2175 time64_t now = ktime_get_seconds();
2176 time64_t conn_timeout;
2177 struct ksock_conn_cb *conn_cb;
2179 /* connd_routes can contain both pending and ordinary routes */
2180 list_for_each_entry(conn_cb, &ksocknal_data.ksnd_connd_routes,
2183 conn_timeout = conn_cb->ksnr_timeout;
2185 if (conn_cb->ksnr_retry_interval == 0 ||
2186 now >= conn_timeout)
2189 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2190 *timeout_p > cfs_time_seconds(conn_timeout - now))
2191 *timeout_p = cfs_time_seconds(conn_timeout - now);
2198 ksocknal_connd(void *arg)
2200 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2201 struct ksock_connreq *cr;
2202 wait_queue_entry_t wait;
2207 spin_lock_bh(connd_lock);
2209 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2210 ksocknal_data.ksnd_connd_starting--;
2211 ksocknal_data.ksnd_connd_running++;
2213 while (!ksocknal_data.ksnd_shuttingdown) {
2214 struct ksock_conn_cb *conn_cb = NULL;
2215 time64_t sec = ktime_get_real_seconds();
2216 long timeout = MAX_SCHEDULE_TIMEOUT;
2217 bool dropped_lock = false;
2219 if (ksocknal_connd_check_stop(sec, &timeout)) {
2220 /* wakeup another one to check stop */
2221 wake_up(&ksocknal_data.ksnd_connd_waitq);
2225 if (ksocknal_connd_check_start(sec, &timeout)) {
2226 /* created new thread */
2227 dropped_lock = true;
2230 cr = list_first_entry_or_null(&ksocknal_data.ksnd_connd_connreqs,
2231 struct ksock_connreq, ksncr_list);
2233 /* Connection accepted by the listener */
2234 list_del(&cr->ksncr_list);
2235 spin_unlock_bh(connd_lock);
2236 dropped_lock = true;
2238 ksocknal_create_conn(cr->ksncr_ni, NULL,
2239 cr->ksncr_sock, SOCKLND_CONN_NONE);
2240 lnet_ni_decref(cr->ksncr_ni);
2241 LIBCFS_FREE(cr, sizeof(*cr));
2243 spin_lock_bh(connd_lock);
2246 /* Only handle an outgoing connection request if there
2247 * is a thread left to handle incoming connections and
2250 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2251 ksocknal_data.ksnd_connd_running)
2252 conn_cb = ksocknal_connd_get_conn_cb_locked(&timeout);
2255 list_del(&conn_cb->ksnr_connd_list);
2256 ksocknal_data.ksnd_connd_connecting++;
2257 spin_unlock_bh(connd_lock);
2258 dropped_lock = true;
2260 if (ksocknal_connect(conn_cb)) {
2261 /* consecutive retry */
2262 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2263 CWARN("massive consecutive re-connecting to %pIS\n",
2264 &conn_cb->ksnr_addr);
2271 ksocknal_conn_cb_decref(conn_cb);
2273 spin_lock_bh(connd_lock);
2274 ksocknal_data.ksnd_connd_connecting--;
2278 if (!need_resched())
2280 spin_unlock_bh(connd_lock);
2282 spin_lock_bh(connd_lock);
2286 /* Nothing to do for 'timeout' */
2287 set_current_state(TASK_INTERRUPTIBLE);
2288 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq,
2290 spin_unlock_bh(connd_lock);
2292 schedule_timeout(timeout);
2294 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2295 spin_lock_bh(connd_lock);
2297 ksocknal_data.ksnd_connd_running--;
2298 spin_unlock_bh(connd_lock);
2300 ksocknal_thread_fini();
2304 static struct ksock_conn *
2305 ksocknal_find_timed_out_conn(struct ksock_peer_ni *peer_ni)
2307 /* We're called with a shared lock on ksnd_global_lock */
2308 struct ksock_conn *conn;
2309 struct ksock_tx *tx;
2310 struct ksock_sched *sched;
2312 list_for_each_entry(conn, &peer_ni->ksnp_conns, ksnc_list) {
2315 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2316 LASSERT (!conn->ksnc_closing);
2317 sched = conn->ksnc_scheduler;
2319 error = conn->ksnc_sock->sk->sk_err;
2321 ksocknal_conn_addref(conn);
2325 CNETERR("A connection with %s (%pISp) was reset; it may have rebooted.\n",
2326 libcfs_idstr(&peer_ni->ksnp_id),
2327 &conn->ksnc_peeraddr);
2330 CNETERR("A connection with %s (%pISp) timed out; the network or node may be down.\n",
2331 libcfs_idstr(&peer_ni->ksnp_id),
2332 &conn->ksnc_peeraddr);
2335 CNETERR("An unexpected network error %d occurred with %s (%pISp\n",
2337 libcfs_idstr(&peer_ni->ksnp_id),
2338 &conn->ksnc_peeraddr);
2345 if (conn->ksnc_rx_started &&
2346 ktime_get_seconds() >= conn->ksnc_rx_deadline) {
2347 /* Timed out incomplete incoming message */
2348 ksocknal_conn_addref(conn);
2349 CNETERR("Timeout receiving from %s (%pISp), state %d wanted %d left %d\n",
2350 libcfs_idstr(&peer_ni->ksnp_id),
2351 &conn->ksnc_peeraddr,
2352 conn->ksnc_rx_state,
2353 conn->ksnc_rx_nob_wanted,
2354 conn->ksnc_rx_nob_left);
2358 spin_lock_bh(&sched->kss_lock);
2359 if ((!list_empty(&conn->ksnc_tx_queue) ||
2360 conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
2361 ktime_get_seconds() >= conn->ksnc_tx_deadline) {
2362 /* Timed out messages queued for sending or
2363 * buffered in the socket's send buffer
2365 ksocknal_conn_addref(conn);
2366 list_for_each_entry(tx, &conn->ksnc_tx_queue,
2369 LNET_MSG_STATUS_LOCAL_TIMEOUT;
2370 CNETERR("Timeout sending data to %s (%pISp) the network or that node may be down.\n",
2371 libcfs_idstr(&peer_ni->ksnp_id),
2372 &conn->ksnc_peeraddr);
2373 spin_unlock_bh(&sched->kss_lock);
2376 spin_unlock_bh(&sched->kss_lock);
2383 ksocknal_flush_stale_txs(struct ksock_peer_ni *peer_ni)
2385 struct ksock_tx *tx;
2386 LIST_HEAD(stale_txs);
2388 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2390 while ((tx = list_first_entry_or_null(&peer_ni->ksnp_tx_queue,
2392 tx_list)) != NULL) {
2393 if (ktime_get_seconds() < tx->tx_deadline)
2396 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2398 list_move_tail(&tx->tx_list, &stale_txs);
2401 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2403 ksocknal_txlist_done(peer_ni->ksnp_ni, &stale_txs, -ETIMEDOUT);
2407 ksocknal_send_keepalive_locked(struct ksock_peer_ni *peer_ni)
2408 __must_hold(&ksocknal_data.ksnd_global_lock)
2410 struct ksock_sched *sched;
2411 struct ksock_conn *conn;
2412 struct ksock_tx *tx;
2414 /* last_alive will be updated by create_conn */
2415 if (list_empty(&peer_ni->ksnp_conns))
2418 if (peer_ni->ksnp_proto != &ksocknal_protocol_v3x)
2421 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2422 ktime_get_seconds() < peer_ni->ksnp_last_alive +
2423 *ksocknal_tunables.ksnd_keepalive)
2426 if (ktime_get_seconds() < peer_ni->ksnp_send_keepalive)
2429 /* retry 10 secs later, so we wouldn't put pressure
2430 * on this peer_ni if we failed to send keepalive this time */
2431 peer_ni->ksnp_send_keepalive = ktime_get_seconds() + 10;
2433 conn = ksocknal_find_conn_locked(peer_ni, NULL, 1);
2435 sched = conn->ksnc_scheduler;
2437 spin_lock_bh(&sched->kss_lock);
2438 if (!list_empty(&conn->ksnc_tx_queue)) {
2439 spin_unlock_bh(&sched->kss_lock);
2440 /* there is an queued ACK, don't need keepalive */
2444 spin_unlock_bh(&sched->kss_lock);
2447 read_unlock(&ksocknal_data.ksnd_global_lock);
2449 /* cookie = 1 is reserved for keepalive PING */
2450 tx = ksocknal_alloc_tx_noop(1, 1);
2452 read_lock(&ksocknal_data.ksnd_global_lock);
2456 if (ksocknal_launch_packet(peer_ni->ksnp_ni, tx, &peer_ni->ksnp_id)
2458 read_lock(&ksocknal_data.ksnd_global_lock);
2462 ksocknal_free_tx(tx);
2463 read_lock(&ksocknal_data.ksnd_global_lock);
2470 ksocknal_check_peer_timeouts(int idx)
2472 struct hlist_head *peers = &ksocknal_data.ksnd_peers[idx];
2473 struct ksock_peer_ni *peer_ni;
2474 struct ksock_conn *conn;
2475 struct ksock_tx *tx;
2478 /* NB. We expect to have a look at all the peers and not find any
2479 * connections to time out, so we just use a shared lock while we
2482 read_lock(&ksocknal_data.ksnd_global_lock);
2484 hlist_for_each_entry(peer_ni, peers, ksnp_list) {
2485 struct ksock_tx *tx_stale;
2486 time64_t deadline = 0;
2490 if (ksocknal_send_keepalive_locked(peer_ni) != 0) {
2491 read_unlock(&ksocknal_data.ksnd_global_lock);
2495 conn = ksocknal_find_timed_out_conn(peer_ni);
2498 read_unlock(&ksocknal_data.ksnd_global_lock);
2500 ksocknal_close_conn_and_siblings(conn, -ETIMEDOUT);
2502 /* NB we won't find this one again, but we can't
2503 * just proceed with the next peer_ni, since we dropped
2504 * ksnd_global_lock and it might be dead already!
2506 ksocknal_conn_decref(conn);
2510 /* we can't process stale txs right here because we're
2511 * holding only shared lock
2513 tx = list_first_entry_or_null(&peer_ni->ksnp_tx_queue,
2514 struct ksock_tx, tx_list);
2515 if (tx && 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);
2525 if (list_empty(&peer_ni->ksnp_zc_req_list))
2529 spin_lock(&peer_ni->ksnp_lock);
2530 list_for_each_entry(tx, &peer_ni->ksnp_zc_req_list, tx_zc_list) {
2531 if (ktime_get_seconds() < tx->tx_deadline)
2533 /* ignore the TX if connection is being closed */
2534 if (tx->tx_conn->ksnc_closing)
2537 if (tx_stale == NULL)
2541 if (tx_stale == NULL) {
2542 spin_unlock(&peer_ni->ksnp_lock);
2546 deadline = tx_stale->tx_deadline;
2547 resid = tx_stale->tx_resid;
2548 conn = tx_stale->tx_conn;
2549 ksocknal_conn_addref(conn);
2551 spin_unlock(&peer_ni->ksnp_lock);
2552 read_unlock(&ksocknal_data.ksnd_global_lock);
2554 CERROR("Total %d stale ZC_REQs for peer_ni %s detected; the "
2555 "oldest(%p) timed out %lld secs ago, "
2556 "resid: %d, wmem: %d\n",
2557 n, libcfs_nidstr(&peer_ni->ksnp_id.nid), tx_stale,
2558 ktime_get_seconds() - deadline,
2559 resid, conn->ksnc_sock->sk->sk_wmem_queued);
2561 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2562 ksocknal_conn_decref(conn);
2566 read_unlock(&ksocknal_data.ksnd_global_lock);
2569 int ksocknal_reaper(void *arg)
2571 wait_queue_entry_t wait;
2572 struct ksock_conn *conn;
2573 struct ksock_sched *sched;
2574 LIST_HEAD(enomem_conns);
2579 time64_t deadline = ktime_get_seconds();
2583 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2585 while (!ksocknal_data.ksnd_shuttingdown) {
2586 conn = list_first_entry_or_null(&ksocknal_data.ksnd_deathrow_conns,
2587 struct ksock_conn, ksnc_list);
2589 list_del(&conn->ksnc_list);
2591 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2593 ksocknal_terminate_conn(conn);
2594 ksocknal_conn_decref(conn);
2596 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2600 conn = list_first_entry_or_null(&ksocknal_data.ksnd_zombie_conns,
2601 struct ksock_conn, ksnc_list);
2603 list_del(&conn->ksnc_list);
2605 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2607 ksocknal_destroy_conn(conn);
2609 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2613 list_splice_init(&ksocknal_data.ksnd_enomem_conns,
2616 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2618 /* reschedule all the connections that stalled with ENOMEM... */
2620 while ((conn = list_first_entry_or_null(&enomem_conns,
2622 ksnc_tx_list)) != NULL) {
2623 list_del(&conn->ksnc_tx_list);
2625 sched = conn->ksnc_scheduler;
2627 spin_lock_bh(&sched->kss_lock);
2629 LASSERT(conn->ksnc_tx_scheduled);
2630 conn->ksnc_tx_ready = 1;
2631 list_add_tail(&conn->ksnc_tx_list,
2632 &sched->kss_tx_conns);
2633 wake_up(&sched->kss_waitq);
2635 spin_unlock_bh(&sched->kss_lock);
2639 /* careful with the jiffy wrap... */
2640 while ((timeout = deadline - ktime_get_seconds()) <= 0) {
2643 int chunk = HASH_SIZE(ksocknal_data.ksnd_peers);
2644 unsigned int lnd_timeout;
2646 /* Time to check for timeouts on a few more peers: I
2647 * do checks every 'p' seconds on a proportion of the
2648 * peer_ni table and I need to check every connection
2649 * 'n' times within a timeout interval, to ensure I
2650 * detect a timeout on any connection within (n+1)/n
2651 * times the timeout interval.
2654 lnd_timeout = ksocknal_timeout();
2655 if (lnd_timeout > n * p)
2656 chunk = (chunk * n * p) / lnd_timeout;
2660 for (i = 0; i < chunk; i++) {
2661 ksocknal_check_peer_timeouts(peer_index);
2662 peer_index = (peer_index + 1) %
2663 HASH_SIZE(ksocknal_data.ksnd_peers);
2669 if (nenomem_conns != 0) {
2670 /* Reduce my timeout if I rescheduled ENOMEM conns.
2671 * This also prevents me getting woken immediately
2672 * if any go back on my enomem list. */
2673 timeout = SOCKNAL_ENOMEM_RETRY;
2675 ksocknal_data.ksnd_reaper_waketime = ktime_get_seconds() +
2678 set_current_state(TASK_INTERRUPTIBLE);
2679 add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2681 if (!ksocknal_data.ksnd_shuttingdown &&
2682 list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
2683 list_empty(&ksocknal_data.ksnd_zombie_conns))
2684 schedule_timeout(cfs_time_seconds(timeout));
2686 set_current_state(TASK_RUNNING);
2687 remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2689 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2692 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2694 ksocknal_thread_fini();