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_id2str(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_id2str(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_process_id 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 "
922 "userspace process %s\n", libcfs_id2str(id));
923 return -EHOSTUNREACH;
927 CERROR("Can't find peer_ni %s\n", libcfs_id2str(id));
928 return -EHOSTUNREACH;
931 memset(&sa, 0, sizeof(sa));
932 sa.sin_family = AF_INET;
933 sa.sin_addr.s_addr = htonl(LNET_NIDADDR(id.nid));
934 sa.sin_port = htons(lnet_acceptor_port());
935 rc = ksocknal_add_peer(ni, id, (struct sockaddr *)&sa);
937 CERROR("Can't add peer_ni %s: %d\n",
938 libcfs_id2str(id), rc);
943 ksocknal_launch_all_connections_locked(peer_ni);
945 conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
947 /* Connection exists; queue message on it */
948 ksocknal_queue_tx_locked (tx, conn);
949 write_unlock_bh(g_lock);
953 if (peer_ni->ksnp_accepting > 0 ||
954 ksocknal_find_connecting_conn_cb_locked(peer_ni) != NULL) {
955 /* the message is going to be pinned to the peer_ni */
956 tx->tx_deadline = ktime_get_seconds() +
959 /* Queue the message until a connection is established */
960 list_add_tail(&tx->tx_list, &peer_ni->ksnp_tx_queue);
961 write_unlock_bh(g_lock);
965 write_unlock_bh(g_lock);
967 /* NB Routes may be ignored if connections to them failed recently */
968 CNETERR("No usable routes to %s\n", libcfs_id2str(id));
969 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
970 return (-EHOSTUNREACH);
974 ksocknal_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
976 /* '1' for consistency with code that checks !mpflag to restore */
977 unsigned int mpflag = 1;
978 int type = lntmsg->msg_type;
979 struct lnet_process_id target = lntmsg->msg_target;
980 unsigned int payload_niov = lntmsg->msg_niov;
981 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
982 unsigned int payload_offset = lntmsg->msg_offset;
983 unsigned int payload_nob = lntmsg->msg_len;
988 /* NB 'private' is different depending on what we're sending.
989 * Just ignore it... */
991 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
992 payload_nob, payload_niov, libcfs_id2str(target));
994 LASSERT (payload_nob == 0 || payload_niov > 0);
995 LASSERT (payload_niov <= LNET_MAX_IOV);
996 LASSERT (!in_interrupt ());
998 desc_size = offsetof(struct ksock_tx,
999 tx_payload[payload_niov]);
1001 if (lntmsg->msg_vmflush)
1002 mpflag = memalloc_noreclaim_save();
1004 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
1006 CERROR("Can't allocate tx desc type %d size %d\n",
1008 if (lntmsg->msg_vmflush)
1009 memalloc_noreclaim_restore(mpflag);
1013 tx->tx_conn = NULL; /* set when assigned a conn */
1014 tx->tx_lnetmsg = lntmsg;
1017 tx->tx_kiov = tx->tx_payload;
1018 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
1019 payload_niov, payload_kiov,
1020 payload_offset, payload_nob);
1022 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
1023 tx->tx_zc_capable = 1;
1025 tx->tx_msg.ksm_csum = 0;
1026 tx->tx_msg.ksm_type = KSOCK_MSG_LNET;
1027 tx->tx_msg.ksm_zc_cookies[0] = 0;
1028 tx->tx_msg.ksm_zc_cookies[1] = 0;
1030 /* The first fragment will be set later in pro_pack */
1031 rc = ksocknal_launch_packet(ni, tx, target);
1033 * We can't test lntsmg->msg_vmflush again as lntmsg may
1037 memalloc_noreclaim_restore(mpflag);
1042 lntmsg->msg_health_status = tx->tx_hstatus;
1043 ksocknal_free_tx(tx);
1048 ksocknal_thread_fini (void)
1050 if (atomic_dec_and_test(&ksocknal_data.ksnd_nthreads))
1051 wake_up_var(&ksocknal_data.ksnd_nthreads);
1055 ksocknal_new_packet(struct ksock_conn *conn, int nob_to_skip)
1057 static char ksocknal_slop_buffer[4096];
1062 LASSERT(conn->ksnc_proto != NULL);
1064 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1065 /* Remind the socket to ack eagerly... */
1066 ksocknal_lib_eager_ack(conn);
1069 if (nob_to_skip == 0) { /* right at next packet boundary now */
1070 conn->ksnc_rx_started = 0;
1071 smp_mb(); /* racing with timeout thread */
1073 switch (conn->ksnc_proto->pro_version) {
1074 case KSOCK_PROTO_V2:
1075 case KSOCK_PROTO_V3:
1076 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1077 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1078 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1080 conn->ksnc_rx_nob_wanted = offsetof(struct ksock_msg, ksm_u);
1081 conn->ksnc_rx_nob_left = offsetof(struct ksock_msg, ksm_u);
1082 conn->ksnc_rx_iov[0].iov_len = offsetof(struct ksock_msg, ksm_u);
1085 case KSOCK_PROTO_V1:
1086 /* Receiving bare struct lnet_hdr */
1087 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1088 conn->ksnc_rx_nob_wanted = sizeof(struct lnet_hdr);
1089 conn->ksnc_rx_nob_left = sizeof(struct lnet_hdr);
1091 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1092 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1093 conn->ksnc_rx_iov[0].iov_len = sizeof(struct lnet_hdr);
1099 conn->ksnc_rx_niov = 1;
1101 conn->ksnc_rx_kiov = NULL;
1102 conn->ksnc_rx_nkiov = 0;
1103 conn->ksnc_rx_csum = ~0;
1107 /* Set up to skip as much as possible now. If there's more left
1108 * (ran out of iov entries) we'll get called again */
1110 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1111 conn->ksnc_rx_nob_left = nob_to_skip;
1112 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1117 nob = min_t(int, nob_to_skip, sizeof(ksocknal_slop_buffer));
1119 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1120 conn->ksnc_rx_iov[niov].iov_len = nob;
1125 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1126 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof(struct kvec));
1128 conn->ksnc_rx_niov = niov;
1129 conn->ksnc_rx_kiov = NULL;
1130 conn->ksnc_rx_nkiov = 0;
1131 conn->ksnc_rx_nob_wanted = skipped;
1136 ksocknal_process_receive(struct ksock_conn *conn,
1137 struct page **rx_scratch_pgs,
1138 struct kvec *scratch_iov)
1140 struct lnet_hdr *lhdr;
1141 struct lnet_process_id *id;
1144 LASSERT(refcount_read(&conn->ksnc_conn_refcount) > 0);
1146 /* NB: sched lock NOT held */
1147 /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
1148 LASSERT(conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1149 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1150 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1151 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1153 if (conn->ksnc_rx_nob_wanted != 0) {
1154 rc = ksocknal_receive(conn, rx_scratch_pgs,
1158 struct lnet_process_id ksnp_id;
1160 ksnp_id = conn->ksnc_peer->ksnp_id;
1162 LASSERT(rc != -EAGAIN);
1164 CDEBUG(D_NET, "[%p] EOF from %s ip %pISp\n",
1165 conn, libcfs_id2str(ksnp_id),
1166 &conn->ksnc_peeraddr);
1167 else if (!conn->ksnc_closing)
1168 CERROR("[%p] Error %d on read from %s ip %pISp\n",
1169 conn, rc, libcfs_id2str(ksnp_id),
1170 &conn->ksnc_peeraddr);
1172 /* it's not an error if conn is being closed */
1173 ksocknal_close_conn_and_siblings (conn,
1174 (conn->ksnc_closing) ? 0 : rc);
1175 return (rc == 0 ? -ESHUTDOWN : rc);
1178 if (conn->ksnc_rx_nob_wanted != 0) {
1183 switch (conn->ksnc_rx_state) {
1184 case SOCKNAL_RX_KSM_HEADER:
1185 if (conn->ksnc_flip) {
1186 __swab32s(&conn->ksnc_msg.ksm_type);
1187 __swab32s(&conn->ksnc_msg.ksm_csum);
1188 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1189 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1192 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1193 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1194 CERROR("%s: Unknown message type: %x\n",
1195 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1196 conn->ksnc_msg.ksm_type);
1197 ksocknal_new_packet(conn, 0);
1198 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1202 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1203 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1204 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1205 /* NOOP Checksum error */
1206 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1207 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1208 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1209 ksocknal_new_packet(conn, 0);
1210 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1214 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1217 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1219 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1220 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1222 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1223 conn->ksnc_msg.ksm_zc_cookies[1]);
1226 CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
1227 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1228 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1229 ksocknal_new_packet(conn, 0);
1230 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1235 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1236 ksocknal_new_packet (conn, 0);
1237 return 0; /* NOOP is done and just return */
1240 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1241 conn->ksnc_rx_nob_wanted = sizeof(struct ksock_lnet_msg);
1242 conn->ksnc_rx_nob_left = sizeof(struct ksock_lnet_msg);
1244 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1245 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1246 conn->ksnc_rx_iov[0].iov_len = sizeof(struct ksock_lnet_msg);
1248 conn->ksnc_rx_niov = 1;
1249 conn->ksnc_rx_kiov = NULL;
1250 conn->ksnc_rx_nkiov = 0;
1252 goto again; /* read lnet header now */
1254 case SOCKNAL_RX_LNET_HEADER:
1255 /* unpack message header */
1256 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1258 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1259 /* Userspace peer_ni */
1260 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1261 id = &conn->ksnc_peer->ksnp_id;
1263 /* Substitute process ID assigned at connection time */
1264 lhdr->src_pid = cpu_to_le32(id->pid);
1265 lhdr->src_nid = cpu_to_le64(id->nid);
1268 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1269 ksocknal_conn_addref(conn); /* ++ref while parsing */
1271 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1272 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1273 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1275 /* I just received garbage: give up on this conn */
1276 ksocknal_new_packet(conn, 0);
1277 ksocknal_close_conn_and_siblings (conn, rc);
1278 ksocknal_conn_decref(conn);
1282 /* I'm racing with ksocknal_recv() */
1283 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1284 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1286 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1289 /* ksocknal_recv() got called */
1292 case SOCKNAL_RX_LNET_PAYLOAD:
1293 /* payload all received */
1296 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1297 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1298 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1299 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1300 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1301 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1305 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1306 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1308 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1309 id = &conn->ksnc_peer->ksnp_id;
1311 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1312 conn->ksnc_msg.ksm_zc_cookies[0],
1313 *ksocknal_tunables.ksnd_nonblk_zcack ||
1314 le64_to_cpu(lhdr->src_nid) != id->nid);
1317 if (rc && conn->ksnc_lnet_msg)
1318 conn->ksnc_lnet_msg->msg_health_status =
1319 LNET_MSG_STATUS_REMOTE_ERROR;
1320 lnet_finalize(conn->ksnc_lnet_msg, rc);
1323 ksocknal_new_packet(conn, 0);
1324 ksocknal_close_conn_and_siblings (conn, rc);
1329 case SOCKNAL_RX_SLOP:
1330 /* starting new packet? */
1331 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1332 return 0; /* come back later */
1333 goto again; /* try to finish reading slop now */
1341 return (-EINVAL); /* keep gcc happy */
1345 ksocknal_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
1346 int delayed, unsigned int niov,
1347 struct bio_vec *kiov, unsigned int offset, unsigned int mlen,
1350 struct ksock_conn *conn = private;
1351 struct ksock_sched *sched = conn->ksnc_scheduler;
1353 LASSERT (mlen <= rlen);
1354 LASSERT (niov <= LNET_MAX_IOV);
1356 conn->ksnc_lnet_msg = msg;
1357 conn->ksnc_rx_nob_wanted = mlen;
1358 conn->ksnc_rx_nob_left = rlen;
1361 conn->ksnc_rx_nkiov = 0;
1362 conn->ksnc_rx_kiov = NULL;
1363 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1364 conn->ksnc_rx_niov = 0;
1366 conn->ksnc_rx_niov = 0;
1367 conn->ksnc_rx_iov = NULL;
1368 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1369 conn->ksnc_rx_nkiov =
1370 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1371 niov, kiov, offset, mlen);
1375 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1376 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1378 LASSERT (conn->ksnc_rx_scheduled);
1380 spin_lock_bh(&sched->kss_lock);
1382 switch (conn->ksnc_rx_state) {
1383 case SOCKNAL_RX_PARSE_WAIT:
1384 list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1385 wake_up(&sched->kss_waitq);
1386 LASSERT(conn->ksnc_rx_ready);
1389 case SOCKNAL_RX_PARSE:
1390 /* scheduler hasn't noticed I'm parsing yet */
1394 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1396 spin_unlock_bh(&sched->kss_lock);
1397 ksocknal_conn_decref(conn);
1402 ksocknal_sched_cansleep(struct ksock_sched *sched)
1406 spin_lock_bh(&sched->kss_lock);
1408 rc = (!ksocknal_data.ksnd_shuttingdown &&
1409 list_empty(&sched->kss_rx_conns) &&
1410 list_empty(&sched->kss_tx_conns));
1412 spin_unlock_bh(&sched->kss_lock);
1416 int ksocknal_scheduler(void *arg)
1418 struct ksock_sched *sched;
1419 struct ksock_conn *conn;
1420 struct ksock_tx *tx;
1422 long id = (long)arg;
1423 struct page **rx_scratch_pgs;
1424 struct kvec *scratch_iov;
1426 sched = ksocknal_data.ksnd_schedulers[KSOCK_THREAD_CPT(id)];
1428 LIBCFS_CPT_ALLOC(rx_scratch_pgs, lnet_cpt_table(), sched->kss_cpt,
1429 sizeof(*rx_scratch_pgs) * LNET_MAX_IOV);
1430 if (!rx_scratch_pgs) {
1431 CERROR("Unable to allocate scratch pages\n");
1435 LIBCFS_CPT_ALLOC(scratch_iov, lnet_cpt_table(), sched->kss_cpt,
1436 sizeof(*scratch_iov) * LNET_MAX_IOV);
1438 CERROR("Unable to allocate scratch iov\n");
1442 rc = cfs_cpt_bind(lnet_cpt_table(), sched->kss_cpt);
1444 CWARN("Can't set CPU partition affinity to %d: %d\n",
1445 sched->kss_cpt, rc);
1448 spin_lock_bh(&sched->kss_lock);
1450 while (!ksocknal_data.ksnd_shuttingdown) {
1451 bool did_something = false;
1453 /* Ensure I progress everything semi-fairly */
1454 conn = list_first_entry_or_null(&sched->kss_rx_conns,
1458 list_del(&conn->ksnc_rx_list);
1460 LASSERT(conn->ksnc_rx_scheduled);
1461 LASSERT(conn->ksnc_rx_ready);
1463 /* clear rx_ready in case receive isn't complete.
1464 * Do it BEFORE we call process_recv, since
1465 * data_ready can set it any time after we release
1467 conn->ksnc_rx_ready = 0;
1468 spin_unlock_bh(&sched->kss_lock);
1470 rc = ksocknal_process_receive(conn, rx_scratch_pgs,
1473 spin_lock_bh(&sched->kss_lock);
1475 /* I'm the only one that can clear this flag */
1476 LASSERT(conn->ksnc_rx_scheduled);
1478 /* Did process_receive get everything it wanted? */
1480 conn->ksnc_rx_ready = 1;
1482 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1483 /* Conn blocked waiting for ksocknal_recv()
1484 * I change its state (under lock) to signal
1485 * it can be rescheduled */
1486 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1487 } else if (conn->ksnc_rx_ready) {
1488 /* reschedule for rx */
1489 list_add_tail(&conn->ksnc_rx_list,
1490 &sched->kss_rx_conns);
1492 conn->ksnc_rx_scheduled = 0;
1494 ksocknal_conn_decref(conn);
1497 did_something = true;
1500 if (!list_empty(&sched->kss_tx_conns)) {
1503 list_splice_init(&sched->kss_zombie_noop_txs, &zlist);
1505 conn = list_first_entry(&sched->kss_tx_conns,
1508 list_del(&conn->ksnc_tx_list);
1510 LASSERT(conn->ksnc_tx_scheduled);
1511 LASSERT(conn->ksnc_tx_ready);
1512 LASSERT(!list_empty(&conn->ksnc_tx_queue));
1514 tx = list_first_entry(&conn->ksnc_tx_queue,
1515 struct ksock_tx, tx_list);
1517 if (conn->ksnc_tx_carrier == tx)
1518 ksocknal_next_tx_carrier(conn);
1520 /* dequeue now so empty list => more to send */
1521 list_del(&tx->tx_list);
1523 /* Clear tx_ready in case send isn't complete. Do
1524 * it BEFORE we call process_transmit, since
1525 * write_space can set it any time after we release
1527 conn->ksnc_tx_ready = 0;
1528 spin_unlock_bh(&sched->kss_lock);
1530 if (!list_empty(&zlist)) {
1531 /* free zombie noop txs, it's fast because
1532 * noop txs are just put in freelist */
1533 ksocknal_txlist_done(NULL, &zlist, 0);
1536 rc = ksocknal_process_transmit(conn, tx, scratch_iov);
1538 if (rc == -ENOMEM || rc == -EAGAIN) {
1539 /* Incomplete send: replace tx on HEAD of tx_queue */
1540 spin_lock_bh(&sched->kss_lock);
1541 list_add(&tx->tx_list,
1542 &conn->ksnc_tx_queue);
1544 /* Complete send; tx -ref */
1545 ksocknal_tx_decref(tx);
1547 spin_lock_bh(&sched->kss_lock);
1548 /* assume space for more */
1549 conn->ksnc_tx_ready = 1;
1552 if (rc == -ENOMEM) {
1553 /* Do nothing; after a short timeout, this
1554 * conn will be reposted on kss_tx_conns. */
1555 } else if (conn->ksnc_tx_ready &&
1556 !list_empty(&conn->ksnc_tx_queue)) {
1557 /* reschedule for tx */
1558 list_add_tail(&conn->ksnc_tx_list,
1559 &sched->kss_tx_conns);
1561 conn->ksnc_tx_scheduled = 0;
1563 ksocknal_conn_decref(conn);
1566 did_something = true;
1568 if (!did_something || /* nothing to do */
1569 need_resched()) { /* hogging CPU? */
1570 spin_unlock_bh(&sched->kss_lock);
1572 if (!did_something) { /* wait for something to do */
1573 rc = wait_event_interruptible_exclusive(
1575 !ksocknal_sched_cansleep(sched));
1581 spin_lock_bh(&sched->kss_lock);
1585 spin_unlock_bh(&sched->kss_lock);
1586 CFS_FREE_PTR_ARRAY(rx_scratch_pgs, LNET_MAX_IOV);
1587 CFS_FREE_PTR_ARRAY(scratch_iov, LNET_MAX_IOV);
1588 ksocknal_thread_fini();
1593 * Add connection to kss_rx_conns of scheduler
1594 * and wakeup the scheduler.
1596 void ksocknal_read_callback(struct ksock_conn *conn)
1598 struct ksock_sched *sched;
1601 sched = conn->ksnc_scheduler;
1603 spin_lock_bh(&sched->kss_lock);
1605 conn->ksnc_rx_ready = 1;
1607 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1608 list_add_tail(&conn->ksnc_rx_list,
1609 &sched->kss_rx_conns);
1610 conn->ksnc_rx_scheduled = 1;
1611 /* extra ref for scheduler */
1612 ksocknal_conn_addref(conn);
1614 wake_up (&sched->kss_waitq);
1616 spin_unlock_bh(&sched->kss_lock);
1622 * Add connection to kss_tx_conns of scheduler
1623 * and wakeup the scheduler.
1625 void ksocknal_write_callback(struct ksock_conn *conn)
1627 struct ksock_sched *sched;
1630 sched = conn->ksnc_scheduler;
1632 spin_lock_bh(&sched->kss_lock);
1634 conn->ksnc_tx_ready = 1;
1636 if (!conn->ksnc_tx_scheduled && /* not being progressed */
1637 !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
1638 list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
1639 conn->ksnc_tx_scheduled = 1;
1640 /* extra ref for scheduler */
1641 ksocknal_conn_addref(conn);
1643 wake_up(&sched->kss_waitq);
1646 spin_unlock_bh(&sched->kss_lock);
1651 static const struct ksock_proto *
1652 ksocknal_parse_proto_version(struct ksock_hello_msg *hello)
1656 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1657 version = hello->kshm_version;
1658 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1659 version = __swab32(hello->kshm_version);
1662 #if SOCKNAL_VERSION_DEBUG
1663 if (*ksocknal_tunables.ksnd_protocol == 1)
1666 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1667 version == KSOCK_PROTO_V3)
1670 if (version == KSOCK_PROTO_V2)
1671 return &ksocknal_protocol_v2x;
1673 if (version == KSOCK_PROTO_V3)
1674 return &ksocknal_protocol_v3x;
1679 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1680 struct lnet_magicversion *hmv;
1682 BUILD_BUG_ON(sizeof(struct lnet_magicversion) !=
1683 offsetof(struct ksock_hello_msg, kshm_src_nid));
1685 hmv = (struct lnet_magicversion *)hello;
1687 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1688 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1689 return &ksocknal_protocol_v1x;
1696 ksocknal_send_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1697 lnet_nid_t peer_nid, struct ksock_hello_msg *hello)
1699 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1700 struct ksock_net *net = (struct ksock_net *)ni->ni_data;
1702 LASSERT(hello->kshm_nips <= LNET_INTERFACES_NUM);
1704 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1705 LASSERT(conn->ksnc_proto != NULL);
1707 hello->kshm_src_nid = lnet_nid_to_nid4(&ni->ni_nid);
1708 hello->kshm_dst_nid = peer_nid;
1709 hello->kshm_src_pid = the_lnet.ln_pid;
1711 hello->kshm_src_incarnation = net->ksnn_incarnation;
1712 hello->kshm_ctype = conn->ksnc_type;
1714 return conn->ksnc_proto->pro_send_hello(conn, hello);
1718 ksocknal_invert_type(int type)
1722 case SOCKLND_CONN_ANY:
1723 case SOCKLND_CONN_CONTROL:
1725 case SOCKLND_CONN_BULK_IN:
1726 return SOCKLND_CONN_BULK_OUT;
1727 case SOCKLND_CONN_BULK_OUT:
1728 return SOCKLND_CONN_BULK_IN;
1730 return (SOCKLND_CONN_NONE);
1735 ksocknal_recv_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1736 struct ksock_hello_msg *hello,
1737 struct lnet_process_id *peerid,
1740 /* Return < 0 fatal error
1742 * EALREADY lost connection race
1743 * EPROTO protocol version mismatch
1745 struct socket *sock = conn->ksnc_sock;
1746 int active = (conn->ksnc_proto != NULL);
1750 const struct ksock_proto *proto;
1751 struct lnet_process_id recv_id;
1753 /* socket type set on active connections - not set on passive */
1754 LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1756 timeout = active ? ksocknal_timeout() :
1757 lnet_acceptor_timeout();
1759 rc = lnet_sock_read(sock, &hello->kshm_magic,
1760 sizeof(hello->kshm_magic), timeout);
1762 CERROR("Error %d reading HELLO from %pIS\n",
1763 rc, &conn->ksnc_peeraddr);
1768 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1769 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1770 hello->kshm_magic != le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1771 /* Unexpected magic! */
1772 CERROR("Bad magic(1) %#08x (%#08x expected) from %pIS\n",
1773 __cpu_to_le32 (hello->kshm_magic),
1774 LNET_PROTO_TCP_MAGIC, &conn->ksnc_peeraddr);
1778 rc = lnet_sock_read(sock, &hello->kshm_version,
1779 sizeof(hello->kshm_version), timeout);
1781 CERROR("Error %d reading HELLO from %pIS\n",
1782 rc, &conn->ksnc_peeraddr);
1787 proto = ksocknal_parse_proto_version(hello);
1788 if (proto == NULL) {
1790 /* unknown protocol from peer_ni,
1791 * tell peer_ni my protocol.
1793 conn->ksnc_proto = &ksocknal_protocol_v3x;
1794 #if SOCKNAL_VERSION_DEBUG
1795 if (*ksocknal_tunables.ksnd_protocol == 2)
1796 conn->ksnc_proto = &ksocknal_protocol_v2x;
1797 else if (*ksocknal_tunables.ksnd_protocol == 1)
1798 conn->ksnc_proto = &ksocknal_protocol_v1x;
1800 hello->kshm_nips = 0;
1801 ksocknal_send_hello(ni, conn,
1802 lnet_nid_to_nid4(&ni->ni_nid),
1806 CERROR("Unknown protocol version (%d.x expected) from %pIS\n",
1807 conn->ksnc_proto->pro_version, &conn->ksnc_peeraddr);
1812 proto_match = (conn->ksnc_proto == proto);
1813 conn->ksnc_proto = proto;
1815 /* receive the rest of hello message anyway */
1816 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1818 CERROR("Error %d reading or checking hello from from %pIS\n",
1819 rc, &conn->ksnc_peeraddr);
1824 *incarnation = hello->kshm_src_incarnation;
1826 if (hello->kshm_src_nid == LNET_NID_ANY) {
1827 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY from %pIS\n",
1828 &conn->ksnc_peeraddr);
1833 rpc_get_port((struct sockaddr *)&conn->ksnc_peeraddr) >
1834 LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1835 /* Userspace NAL assigns peer_ni process ID from socket */
1836 recv_id.pid = rpc_get_port((struct sockaddr *)
1837 &conn->ksnc_peeraddr) |
1839 LASSERT(conn->ksnc_peeraddr.ss_family == AF_INET);
1840 recv_id.nid = LNET_MKNID(
1841 LNET_NID_NET(&ni->ni_nid),
1842 ntohl(((struct sockaddr_in *)
1843 &conn->ksnc_peeraddr)->sin_addr.s_addr));
1845 recv_id.nid = hello->kshm_src_nid;
1846 recv_id.pid = hello->kshm_src_pid;
1852 /* peer_ni determines type */
1853 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1854 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1855 CERROR("Unexpected type %d from %s ip %pIS\n",
1856 hello->kshm_ctype, libcfs_id2str(*peerid),
1857 &conn->ksnc_peeraddr);
1863 if (peerid->pid != recv_id.pid ||
1864 peerid->nid != recv_id.nid) {
1865 LCONSOLE_ERROR_MSG(0x130,
1866 "Connected successfully to %s on host %pIS, but they claimed they were %s; please check your Lustre configuration.\n",
1867 libcfs_id2str(*peerid),
1868 &conn->ksnc_peeraddr,
1869 libcfs_id2str(recv_id));
1873 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1874 /* Possible protocol mismatch or I lost the connection race */
1875 return proto_match ? EALREADY : EPROTO;
1878 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1879 CERROR("Mismatched types: me %d, %s ip %pIS %d\n",
1880 conn->ksnc_type, libcfs_id2str(*peerid),
1881 &conn->ksnc_peeraddr,
1889 ksocknal_connect(struct ksock_conn_cb *conn_cb)
1892 struct ksock_peer_ni *peer_ni = conn_cb->ksnr_peer;
1895 struct socket *sock;
1897 bool retry_later = false;
1900 deadline = ktime_get_seconds() + ksocknal_timeout();
1902 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1904 LASSERT(conn_cb->ksnr_scheduled);
1905 LASSERT(!conn_cb->ksnr_connecting);
1907 conn_cb->ksnr_connecting = 1;
1910 wanted = ksocknal_conn_cb_mask() & ~conn_cb->ksnr_connected;
1912 /* stop connecting if peer_ni/cb got closed under me, or
1913 * conn cb got connected while queued
1915 if (peer_ni->ksnp_closing || conn_cb->ksnr_deleted ||
1917 retry_later = false;
1921 /* reschedule if peer_ni is connecting to me */
1922 if (peer_ni->ksnp_accepting > 0) {
1924 "peer_ni %s(%d) already connecting to me, retry later.\n",
1925 libcfs_nid2str(peer_ni->ksnp_id.nid), peer_ni->ksnp_accepting);
1929 if (retry_later) /* needs reschedule */
1932 if ((wanted & BIT(SOCKLND_CONN_ANY)) != 0) {
1933 type = SOCKLND_CONN_ANY;
1934 } else if ((wanted & BIT(SOCKLND_CONN_CONTROL)) != 0) {
1935 type = SOCKLND_CONN_CONTROL;
1936 } else if ((wanted & BIT(SOCKLND_CONN_BULK_IN)) != 0 &&
1937 conn_cb->ksnr_blki_conn_count <= conn_cb->ksnr_blko_conn_count) {
1938 type = SOCKLND_CONN_BULK_IN;
1940 LASSERT ((wanted & BIT(SOCKLND_CONN_BULK_OUT)) != 0);
1941 type = SOCKLND_CONN_BULK_OUT;
1944 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1946 if (ktime_get_seconds() >= deadline) {
1948 lnet_connect_console_error(rc, peer_ni->ksnp_id.nid,
1950 &conn_cb->ksnr_addr);
1954 sock = lnet_connect(peer_ni->ksnp_id.nid,
1955 conn_cb->ksnr_myiface,
1956 (struct sockaddr *)&conn_cb->ksnr_addr,
1957 peer_ni->ksnp_ni->ni_net_ns);
1963 rc = ksocknal_create_conn(peer_ni->ksnp_ni, conn_cb, sock,
1966 lnet_connect_console_error(rc, peer_ni->ksnp_id.nid,
1968 &conn_cb->ksnr_addr);
1972 /* A +ve RC means I have to retry because I lost the connection
1973 * race or I have to renegotiate protocol version */
1974 retry_later = (rc != 0);
1976 CDEBUG(D_NET, "peer_ni %s: conn race, retry later.\n",
1977 libcfs_nid2str(peer_ni->ksnp_id.nid));
1979 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1982 conn_cb->ksnr_scheduled = 0;
1983 conn_cb->ksnr_connecting = 0;
1986 /* re-queue for attention; this frees me up to handle
1987 * the peer_ni's incoming connection request
1990 if (rc == EALREADY ||
1991 (rc == 0 && peer_ni->ksnp_accepting > 0)) {
1992 /* We want to introduce a delay before next
1993 * attempt to connect if we lost conn race, but
1994 * the race is resolved quickly usually, so
1995 * min_reconnectms should be good heuristic
1997 conn_cb->ksnr_retry_interval =
1998 *ksocknal_tunables.ksnd_min_reconnectms / 1000;
1999 conn_cb->ksnr_timeout = ktime_get_seconds() +
2000 conn_cb->ksnr_retry_interval;
2003 ksocknal_launch_connection_locked(conn_cb);
2006 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2010 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2012 conn_cb->ksnr_scheduled = 0;
2013 conn_cb->ksnr_connecting = 0;
2015 /* This is a retry rather than a new connection */
2016 conn_cb->ksnr_retry_interval *= 2;
2017 conn_cb->ksnr_retry_interval =
2018 max_t(time64_t, conn_cb->ksnr_retry_interval,
2019 *ksocknal_tunables.ksnd_min_reconnectms / 1000);
2020 conn_cb->ksnr_retry_interval =
2021 min_t(time64_t, conn_cb->ksnr_retry_interval,
2022 *ksocknal_tunables.ksnd_max_reconnectms / 1000);
2024 LASSERT(conn_cb->ksnr_retry_interval);
2025 conn_cb->ksnr_timeout = ktime_get_seconds() +
2026 conn_cb->ksnr_retry_interval;
2028 if (!list_empty(&peer_ni->ksnp_tx_queue) &&
2029 peer_ni->ksnp_accepting == 0 &&
2030 !ksocknal_find_connecting_conn_cb_locked(peer_ni)) {
2031 struct ksock_conn *conn;
2033 /* ksnp_tx_queue is queued on a conn on successful
2034 * connection for V1.x and V2.x
2036 conn = list_first_entry_or_null(&peer_ni->ksnp_conns,
2037 struct ksock_conn, ksnc_list);
2039 LASSERT(conn->ksnc_proto == &ksocknal_protocol_v3x);
2041 /* take all the blocked packets while I've got the lock and
2044 list_splice_init(&peer_ni->ksnp_tx_queue, &zombies);
2047 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2049 ksocknal_peer_failed(peer_ni);
2050 ksocknal_txlist_done(peer_ni->ksnp_ni, &zombies, rc);
2055 * check whether we need to create more connds.
2056 * It will try to create new thread if it's necessary, @timeout can
2057 * be updated if failed to create, so caller wouldn't keep try while
2058 * running out of resource.
2061 ksocknal_connd_check_start(time64_t sec, long *timeout)
2064 int total = ksocknal_data.ksnd_connd_starting +
2065 ksocknal_data.ksnd_connd_running;
2067 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2068 /* still in initializing */
2072 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2073 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2074 /* can't create more connd, or still have enough
2075 * threads to handle more connecting */
2079 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2080 /* no pending connecting request */
2084 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2085 /* may run out of resource, retry later */
2086 *timeout = cfs_time_seconds(1);
2090 if (ksocknal_data.ksnd_connd_starting > 0) {
2091 /* serialize starting to avoid flood */
2095 ksocknal_data.ksnd_connd_starting_stamp = sec;
2096 ksocknal_data.ksnd_connd_starting++;
2097 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2099 /* NB: total is the next id */
2100 rc = ksocknal_thread_start(ksocknal_connd, NULL,
2101 "socknal_cd%02d", total);
2103 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2108 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2109 ksocknal_data.ksnd_connd_starting--;
2110 ksocknal_data.ksnd_connd_failed_stamp = ktime_get_real_seconds();
2116 * check whether current thread can exit, it will return 1 if there are too
2117 * many threads and no creating in past 120 seconds.
2118 * Also, this function may update @timeout to make caller come back
2119 * again to recheck these conditions.
2122 ksocknal_connd_check_stop(time64_t sec, long *timeout)
2126 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2127 /* still in initializing */
2131 if (ksocknal_data.ksnd_connd_starting > 0) {
2132 /* in progress of starting new thread */
2136 if (ksocknal_data.ksnd_connd_running <=
2137 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2141 /* created thread in past 120 seconds? */
2142 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2143 SOCKNAL_CONND_TIMEOUT - sec);
2145 *timeout = (val > 0) ? cfs_time_seconds(val) :
2146 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2150 /* no creating in past 120 seconds */
2152 return ksocknal_data.ksnd_connd_running >
2153 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2156 /* Go through connd_cbs queue looking for a conn_cb that we can process
2157 * right now, @timeout_p can be updated if we need to come back later */
2158 static struct ksock_conn_cb *
2159 ksocknal_connd_get_conn_cb_locked(signed long *timeout_p)
2161 time64_t now = ktime_get_seconds();
2162 time64_t conn_timeout;
2163 struct ksock_conn_cb *conn_cb;
2165 /* connd_routes can contain both pending and ordinary routes */
2166 list_for_each_entry(conn_cb, &ksocknal_data.ksnd_connd_routes,
2169 conn_timeout = conn_cb->ksnr_timeout;
2171 if (conn_cb->ksnr_retry_interval == 0 ||
2172 now >= conn_timeout)
2175 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2176 *timeout_p > cfs_time_seconds(conn_timeout - now))
2177 *timeout_p = cfs_time_seconds(conn_timeout - now);
2184 ksocknal_connd(void *arg)
2186 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2187 struct ksock_connreq *cr;
2188 wait_queue_entry_t wait;
2193 spin_lock_bh(connd_lock);
2195 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2196 ksocknal_data.ksnd_connd_starting--;
2197 ksocknal_data.ksnd_connd_running++;
2199 while (!ksocknal_data.ksnd_shuttingdown) {
2200 struct ksock_conn_cb *conn_cb = NULL;
2201 time64_t sec = ktime_get_real_seconds();
2202 long timeout = MAX_SCHEDULE_TIMEOUT;
2203 bool dropped_lock = false;
2205 if (ksocknal_connd_check_stop(sec, &timeout)) {
2206 /* wakeup another one to check stop */
2207 wake_up(&ksocknal_data.ksnd_connd_waitq);
2211 if (ksocknal_connd_check_start(sec, &timeout)) {
2212 /* created new thread */
2213 dropped_lock = true;
2216 cr = list_first_entry_or_null(&ksocknal_data.ksnd_connd_connreqs,
2217 struct ksock_connreq, ksncr_list);
2219 /* Connection accepted by the listener */
2220 list_del(&cr->ksncr_list);
2221 spin_unlock_bh(connd_lock);
2222 dropped_lock = true;
2224 ksocknal_create_conn(cr->ksncr_ni, NULL,
2225 cr->ksncr_sock, SOCKLND_CONN_NONE);
2226 lnet_ni_decref(cr->ksncr_ni);
2227 LIBCFS_FREE(cr, sizeof(*cr));
2229 spin_lock_bh(connd_lock);
2232 /* Only handle an outgoing connection request if there
2233 * is a thread left to handle incoming connections and
2236 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2237 ksocknal_data.ksnd_connd_running)
2238 conn_cb = ksocknal_connd_get_conn_cb_locked(&timeout);
2241 list_del(&conn_cb->ksnr_connd_list);
2242 ksocknal_data.ksnd_connd_connecting++;
2243 spin_unlock_bh(connd_lock);
2244 dropped_lock = true;
2246 if (ksocknal_connect(conn_cb)) {
2247 /* consecutive retry */
2248 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2249 CWARN("massive consecutive re-connecting to %pIS\n",
2250 &conn_cb->ksnr_addr);
2257 ksocknal_conn_cb_decref(conn_cb);
2259 spin_lock_bh(connd_lock);
2260 ksocknal_data.ksnd_connd_connecting--;
2264 if (!need_resched())
2266 spin_unlock_bh(connd_lock);
2268 spin_lock_bh(connd_lock);
2272 /* Nothing to do for 'timeout' */
2273 set_current_state(TASK_INTERRUPTIBLE);
2274 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq,
2276 spin_unlock_bh(connd_lock);
2278 schedule_timeout(timeout);
2280 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2281 spin_lock_bh(connd_lock);
2283 ksocknal_data.ksnd_connd_running--;
2284 spin_unlock_bh(connd_lock);
2286 ksocknal_thread_fini();
2290 static struct ksock_conn *
2291 ksocknal_find_timed_out_conn(struct ksock_peer_ni *peer_ni)
2293 /* We're called with a shared lock on ksnd_global_lock */
2294 struct ksock_conn *conn;
2295 struct ksock_tx *tx;
2297 list_for_each_entry(conn, &peer_ni->ksnp_conns, ksnc_list) {
2300 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2301 LASSERT (!conn->ksnc_closing);
2303 error = conn->ksnc_sock->sk->sk_err;
2305 ksocknal_conn_addref(conn);
2309 CNETERR("A connection with %s (%pISp) was reset; it may have rebooted.\n",
2310 libcfs_id2str(peer_ni->ksnp_id),
2311 &conn->ksnc_peeraddr);
2314 CNETERR("A connection with %s (%pISp) timed out; the network or node may be down.\n",
2315 libcfs_id2str(peer_ni->ksnp_id),
2316 &conn->ksnc_peeraddr);
2319 CNETERR("An unexpected network error %d occurred with %s (%pISp\n",
2321 libcfs_id2str(peer_ni->ksnp_id),
2322 &conn->ksnc_peeraddr);
2329 if (conn->ksnc_rx_started &&
2330 ktime_get_seconds() >= conn->ksnc_rx_deadline) {
2331 /* Timed out incomplete incoming message */
2332 ksocknal_conn_addref(conn);
2333 CNETERR("Timeout receiving from %s (%pISp), state %d wanted %d left %d\n",
2334 libcfs_id2str(peer_ni->ksnp_id),
2335 &conn->ksnc_peeraddr,
2336 conn->ksnc_rx_state,
2337 conn->ksnc_rx_nob_wanted,
2338 conn->ksnc_rx_nob_left);
2342 if ((!list_empty(&conn->ksnc_tx_queue) ||
2343 conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
2344 ktime_get_seconds() >= conn->ksnc_tx_deadline) {
2345 /* Timed out messages queued for sending or
2346 * buffered in the socket's send buffer
2348 ksocknal_conn_addref(conn);
2349 list_for_each_entry(tx, &conn->ksnc_tx_queue,
2352 LNET_MSG_STATUS_LOCAL_TIMEOUT;
2353 CNETERR("Timeout sending data to %s (%pISp) the network or that node may be down.\n",
2354 libcfs_id2str(peer_ni->ksnp_id),
2355 &conn->ksnc_peeraddr);
2364 ksocknal_flush_stale_txs(struct ksock_peer_ni *peer_ni)
2366 struct ksock_tx *tx;
2367 LIST_HEAD(stale_txs);
2369 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2371 while ((tx = list_first_entry_or_null(&peer_ni->ksnp_tx_queue,
2373 tx_list)) != NULL) {
2374 if (ktime_get_seconds() < tx->tx_deadline)
2377 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2379 list_move_tail(&tx->tx_list, &stale_txs);
2382 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2384 ksocknal_txlist_done(peer_ni->ksnp_ni, &stale_txs, -ETIMEDOUT);
2388 ksocknal_send_keepalive_locked(struct ksock_peer_ni *peer_ni)
2389 __must_hold(&ksocknal_data.ksnd_global_lock)
2391 struct ksock_sched *sched;
2392 struct ksock_conn *conn;
2393 struct ksock_tx *tx;
2395 /* last_alive will be updated by create_conn */
2396 if (list_empty(&peer_ni->ksnp_conns))
2399 if (peer_ni->ksnp_proto != &ksocknal_protocol_v3x)
2402 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2403 ktime_get_seconds() < peer_ni->ksnp_last_alive +
2404 *ksocknal_tunables.ksnd_keepalive)
2407 if (ktime_get_seconds() < peer_ni->ksnp_send_keepalive)
2410 /* retry 10 secs later, so we wouldn't put pressure
2411 * on this peer_ni if we failed to send keepalive this time */
2412 peer_ni->ksnp_send_keepalive = ktime_get_seconds() + 10;
2414 conn = ksocknal_find_conn_locked(peer_ni, NULL, 1);
2416 sched = conn->ksnc_scheduler;
2418 spin_lock_bh(&sched->kss_lock);
2419 if (!list_empty(&conn->ksnc_tx_queue)) {
2420 spin_unlock_bh(&sched->kss_lock);
2421 /* there is an queued ACK, don't need keepalive */
2425 spin_unlock_bh(&sched->kss_lock);
2428 read_unlock(&ksocknal_data.ksnd_global_lock);
2430 /* cookie = 1 is reserved for keepalive PING */
2431 tx = ksocknal_alloc_tx_noop(1, 1);
2433 read_lock(&ksocknal_data.ksnd_global_lock);
2437 if (ksocknal_launch_packet(peer_ni->ksnp_ni, tx, peer_ni->ksnp_id) == 0) {
2438 read_lock(&ksocknal_data.ksnd_global_lock);
2442 ksocknal_free_tx(tx);
2443 read_lock(&ksocknal_data.ksnd_global_lock);
2450 ksocknal_check_peer_timeouts(int idx)
2452 struct hlist_head *peers = &ksocknal_data.ksnd_peers[idx];
2453 struct ksock_peer_ni *peer_ni;
2454 struct ksock_conn *conn;
2455 struct ksock_tx *tx;
2458 /* NB. We expect to have a look at all the peers and not find any
2459 * connections to time out, so we just use a shared lock while we
2462 read_lock(&ksocknal_data.ksnd_global_lock);
2464 hlist_for_each_entry(peer_ni, peers, ksnp_list) {
2465 struct ksock_tx *tx_stale;
2466 time64_t deadline = 0;
2470 if (ksocknal_send_keepalive_locked(peer_ni) != 0) {
2471 read_unlock(&ksocknal_data.ksnd_global_lock);
2475 conn = ksocknal_find_timed_out_conn(peer_ni);
2478 read_unlock(&ksocknal_data.ksnd_global_lock);
2480 ksocknal_close_conn_and_siblings(conn, -ETIMEDOUT);
2482 /* NB we won't find this one again, but we can't
2483 * just proceed with the next peer_ni, since we dropped
2484 * ksnd_global_lock and it might be dead already!
2486 ksocknal_conn_decref(conn);
2490 /* we can't process stale txs right here because we're
2491 * holding only shared lock
2493 tx = list_first_entry_or_null(&peer_ni->ksnp_tx_queue,
2494 struct ksock_tx, tx_list);
2495 if (tx && ktime_get_seconds() >= tx->tx_deadline) {
2496 ksocknal_peer_addref(peer_ni);
2497 read_unlock(&ksocknal_data.ksnd_global_lock);
2499 ksocknal_flush_stale_txs(peer_ni);
2501 ksocknal_peer_decref(peer_ni);
2505 if (list_empty(&peer_ni->ksnp_zc_req_list))
2509 spin_lock(&peer_ni->ksnp_lock);
2510 list_for_each_entry(tx, &peer_ni->ksnp_zc_req_list, tx_zc_list) {
2511 if (ktime_get_seconds() < tx->tx_deadline)
2513 /* ignore the TX if connection is being closed */
2514 if (tx->tx_conn->ksnc_closing)
2517 if (tx_stale == NULL)
2521 if (tx_stale == NULL) {
2522 spin_unlock(&peer_ni->ksnp_lock);
2526 deadline = tx_stale->tx_deadline;
2527 resid = tx_stale->tx_resid;
2528 conn = tx_stale->tx_conn;
2529 ksocknal_conn_addref(conn);
2531 spin_unlock(&peer_ni->ksnp_lock);
2532 read_unlock(&ksocknal_data.ksnd_global_lock);
2534 CERROR("Total %d stale ZC_REQs for peer_ni %s detected; the "
2535 "oldest(%p) timed out %lld secs ago, "
2536 "resid: %d, wmem: %d\n",
2537 n, libcfs_nid2str(peer_ni->ksnp_id.nid), tx_stale,
2538 ktime_get_seconds() - deadline,
2539 resid, conn->ksnc_sock->sk->sk_wmem_queued);
2541 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2542 ksocknal_conn_decref(conn);
2546 read_unlock(&ksocknal_data.ksnd_global_lock);
2549 int ksocknal_reaper(void *arg)
2551 wait_queue_entry_t wait;
2552 struct ksock_conn *conn;
2553 struct ksock_sched *sched;
2554 LIST_HEAD(enomem_conns);
2559 time64_t deadline = ktime_get_seconds();
2563 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2565 while (!ksocknal_data.ksnd_shuttingdown) {
2566 conn = list_first_entry_or_null(&ksocknal_data.ksnd_deathrow_conns,
2567 struct ksock_conn, ksnc_list);
2569 list_del(&conn->ksnc_list);
2571 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2573 ksocknal_terminate_conn(conn);
2574 ksocknal_conn_decref(conn);
2576 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2580 conn = list_first_entry_or_null(&ksocknal_data.ksnd_zombie_conns,
2581 struct ksock_conn, ksnc_list);
2583 list_del(&conn->ksnc_list);
2585 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2587 ksocknal_destroy_conn(conn);
2589 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2593 list_splice_init(&ksocknal_data.ksnd_enomem_conns,
2596 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2598 /* reschedule all the connections that stalled with ENOMEM... */
2600 while ((conn = list_first_entry_or_null(&enomem_conns,
2602 ksnc_tx_list)) != NULL) {
2603 list_del(&conn->ksnc_tx_list);
2605 sched = conn->ksnc_scheduler;
2607 spin_lock_bh(&sched->kss_lock);
2609 LASSERT(conn->ksnc_tx_scheduled);
2610 conn->ksnc_tx_ready = 1;
2611 list_add_tail(&conn->ksnc_tx_list,
2612 &sched->kss_tx_conns);
2613 wake_up(&sched->kss_waitq);
2615 spin_unlock_bh(&sched->kss_lock);
2619 /* careful with the jiffy wrap... */
2620 while ((timeout = deadline - ktime_get_seconds()) <= 0) {
2623 int chunk = HASH_SIZE(ksocknal_data.ksnd_peers);
2624 unsigned int lnd_timeout;
2626 /* Time to check for timeouts on a few more peers: I
2627 * do checks every 'p' seconds on a proportion of the
2628 * peer_ni table and I need to check every connection
2629 * 'n' times within a timeout interval, to ensure I
2630 * detect a timeout on any connection within (n+1)/n
2631 * times the timeout interval.
2634 lnd_timeout = ksocknal_timeout();
2635 if (lnd_timeout > n * p)
2636 chunk = (chunk * n * p) / lnd_timeout;
2640 for (i = 0; i < chunk; i++) {
2641 ksocknal_check_peer_timeouts(peer_index);
2642 peer_index = (peer_index + 1) %
2643 HASH_SIZE(ksocknal_data.ksnd_peers);
2649 if (nenomem_conns != 0) {
2650 /* Reduce my timeout if I rescheduled ENOMEM conns.
2651 * This also prevents me getting woken immediately
2652 * if any go back on my enomem list. */
2653 timeout = SOCKNAL_ENOMEM_RETRY;
2655 ksocknal_data.ksnd_reaper_waketime = ktime_get_seconds() +
2658 set_current_state(TASK_INTERRUPTIBLE);
2659 add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2661 if (!ksocknal_data.ksnd_shuttingdown &&
2662 list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
2663 list_empty(&ksocknal_data.ksnd_zombie_conns))
2664 schedule_timeout(cfs_time_seconds(timeout));
2666 set_current_state(TASK_RUNNING);
2667 remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2669 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2672 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2674 ksocknal_thread_fini();