2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
4 * Copyright (c) 2011, 2017, Intel Corporation.
6 * Author: Zach Brown <zab@zabbo.net>
7 * Author: Peter J. Braam <braam@clusterfs.com>
8 * Author: Phil Schwan <phil@clusterfs.com>
9 * Author: Eric Barton <eric@bartonsoftware.com>
11 * This file is part of Lustre, https://wiki.whamcloud.com/
13 * Portals is free software; you can redistribute it and/or
14 * modify it under the terms of version 2 of the GNU General Public
15 * License as published by the Free Software Foundation.
17 * Portals is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with Portals; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <libcfs/linux/linux-mem.h>
31 ksocknal_alloc_tx(int type, int size)
33 struct ksock_tx *tx = NULL;
35 if (type == KSOCK_MSG_NOOP) {
36 LASSERT(size == KSOCK_NOOP_TX_SIZE);
38 /* searching for a noop tx in free list */
39 spin_lock(&ksocknal_data.ksnd_tx_lock);
41 if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
42 tx = list_entry(ksocknal_data.ksnd_idle_noop_txs.next,
43 struct ksock_tx, tx_list);
44 LASSERT(tx->tx_desc_size == size);
45 list_del(&tx->tx_list);
48 spin_unlock(&ksocknal_data.ksnd_tx_lock);
52 LIBCFS_ALLOC(tx, size);
57 atomic_set(&tx->tx_refcount, 1);
58 tx->tx_zc_aborted = 0;
59 tx->tx_zc_capable = 0;
60 tx->tx_zc_checked = 0;
61 tx->tx_hstatus = LNET_MSG_STATUS_OK;
62 tx->tx_desc_size = size;
64 atomic_inc(&ksocknal_data.ksnd_nactive_txs);
70 ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
74 tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
76 CERROR("Can't allocate noop tx desc\n");
81 tx->tx_lnetmsg = NULL;
84 tx->tx_iov = tx->tx_frags.virt.iov;
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_iov(struct ksock_conn *conn, struct ksock_tx *tx,
116 struct kvec *scratch_iov)
118 struct kvec *iov = tx->tx_iov;
122 LASSERT(tx->tx_niov > 0);
124 /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */
125 rc = ksocknal_lib_send_iov(conn, tx, scratch_iov);
127 if (rc <= 0) /* sent nothing? */
131 LASSERT(nob <= tx->tx_resid);
136 LASSERT(tx->tx_niov > 0);
138 if (nob < (int) iov->iov_len) {
139 iov->iov_base += nob;
153 ksocknal_send_kiov(struct ksock_conn *conn, struct ksock_tx *tx,
154 struct kvec *scratch_iov)
156 struct bio_vec *kiov = tx->tx_kiov;
160 LASSERT(tx->tx_niov == 0);
161 LASSERT(tx->tx_nkiov > 0);
163 /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
164 rc = ksocknal_lib_send_kiov(conn, tx, scratch_iov);
166 if (rc <= 0) /* sent nothing? */
170 LASSERT(nob <= tx->tx_resid);
175 LASSERT(tx->tx_nkiov > 0);
177 if (nob < (int)kiov->bv_len) {
178 kiov->bv_offset += nob;
183 nob -= (int)kiov->bv_len;
184 tx->tx_kiov = ++kiov;
192 ksocknal_transmit(struct ksock_conn *conn, struct ksock_tx *tx,
193 struct kvec *scratch_iov)
198 if (ksocknal_data.ksnd_stall_tx != 0)
199 schedule_timeout_uninterruptible(
200 cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
202 LASSERT(tx->tx_resid != 0);
204 rc = ksocknal_connsock_addref(conn);
206 LASSERT(conn->ksnc_closing);
211 if (ksocknal_data.ksnd_enomem_tx > 0) {
213 ksocknal_data.ksnd_enomem_tx--;
215 } else if (tx->tx_niov != 0) {
216 rc = ksocknal_send_iov(conn, tx, scratch_iov);
218 rc = ksocknal_send_kiov(conn, tx, scratch_iov);
221 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
222 if (rc > 0) /* sent something? */
223 conn->ksnc_tx_bufnob += rc; /* account it */
225 if (bufnob < conn->ksnc_tx_bufnob) {
226 /* allocated send buffer bytes < computed; infer
227 * something got ACKed */
228 conn->ksnc_tx_deadline = ktime_get_seconds() +
229 lnet_get_lnd_timeout();
230 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
231 conn->ksnc_tx_bufnob = bufnob;
235 if (rc <= 0) { /* Didn't write anything? */
236 /* some stacks return 0 instead of -EAGAIN */
240 /* Check if EAGAIN is due to memory pressure */
241 if (rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
247 /* socket's wmem_queued now includes 'rc' bytes */
248 atomic_sub (rc, &conn->ksnc_tx_nob);
251 } while (tx->tx_resid != 0);
253 ksocknal_connsock_decref(conn);
258 ksocknal_recv_iov(struct ksock_conn *conn, struct kvec *scratchiov)
260 struct kvec *iov = conn->ksnc_rx_iov;
264 LASSERT(conn->ksnc_rx_niov > 0);
266 /* Never touch conn->ksnc_rx_iov or change connection
267 * status inside ksocknal_lib_recv_iov */
268 rc = ksocknal_lib_recv_iov(conn, scratchiov);
273 /* received something... */
276 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
277 conn->ksnc_rx_deadline = ktime_get_seconds() +
278 lnet_get_lnd_timeout();
279 smp_mb(); /* order with setting rx_started */
280 conn->ksnc_rx_started = 1;
282 conn->ksnc_rx_nob_wanted -= nob;
283 conn->ksnc_rx_nob_left -= nob;
286 LASSERT(conn->ksnc_rx_niov > 0);
288 if (nob < (int)iov->iov_len) {
290 iov->iov_base += nob;
295 conn->ksnc_rx_iov = ++iov;
296 conn->ksnc_rx_niov--;
303 ksocknal_recv_kiov(struct ksock_conn *conn, struct page **rx_scratch_pgs,
304 struct kvec *scratch_iov)
306 struct bio_vec *kiov = conn->ksnc_rx_kiov;
309 LASSERT(conn->ksnc_rx_nkiov > 0);
311 /* Never touch conn->ksnc_rx_kiov or change connection
312 * status inside ksocknal_lib_recv_iov */
313 rc = ksocknal_lib_recv_kiov(conn, rx_scratch_pgs, scratch_iov);
318 /* received something... */
321 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
322 conn->ksnc_rx_deadline = ktime_get_seconds() +
323 lnet_get_lnd_timeout();
324 smp_mb(); /* order with setting rx_started */
325 conn->ksnc_rx_started = 1;
327 conn->ksnc_rx_nob_wanted -= nob;
328 conn->ksnc_rx_nob_left -= nob;
331 LASSERT(conn->ksnc_rx_nkiov > 0);
333 if (nob < (int) kiov->bv_len) {
334 kiov->bv_offset += nob;
340 conn->ksnc_rx_kiov = ++kiov;
341 conn->ksnc_rx_nkiov--;
348 ksocknal_receive(struct ksock_conn *conn, struct page **rx_scratch_pgs,
349 struct kvec *scratch_iov)
351 /* Return 1 on success, 0 on EOF, < 0 on error.
352 * Caller checks ksnc_rx_nob_wanted to determine
353 * progress/completion. */
357 if (ksocknal_data.ksnd_stall_rx != 0)
358 schedule_timeout_uninterruptible(
359 cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
361 rc = ksocknal_connsock_addref(conn);
363 LASSERT(conn->ksnc_closing);
368 if (conn->ksnc_rx_niov != 0)
369 rc = ksocknal_recv_iov(conn, scratch_iov);
371 rc = ksocknal_recv_kiov(conn, rx_scratch_pgs,
375 /* error/EOF or partial receive */
378 } else if (rc == 0 && conn->ksnc_rx_started) {
379 /* EOF in the middle of a message */
385 /* Completed a fragment */
387 if (conn->ksnc_rx_nob_wanted == 0) {
393 ksocknal_connsock_decref(conn);
398 ksocknal_tx_done(struct lnet_ni *ni, struct ksock_tx *tx, int rc)
400 struct lnet_msg *lnetmsg = tx->tx_lnetmsg;
401 enum lnet_msg_hstatus hstatus = tx->tx_hstatus;
404 LASSERT(ni != NULL || tx->tx_conn != NULL);
406 if (!rc && (tx->tx_resid != 0 || tx->tx_zc_aborted)) {
408 if (hstatus == LNET_MSG_STATUS_OK)
409 hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
412 if (tx->tx_conn != NULL)
413 ksocknal_conn_decref(tx->tx_conn);
415 ksocknal_free_tx(tx);
416 if (lnetmsg != NULL) { /* KSOCK_MSG_NOOP go without lnetmsg */
417 lnetmsg->msg_health_status = hstatus;
418 lnet_finalize(lnetmsg, rc);
425 ksocknal_txlist_done(struct lnet_ni *ni, struct list_head *txlist, int error)
429 while (!list_empty(txlist)) {
430 tx = list_entry(txlist->next, struct ksock_tx, tx_list);
432 if (error && tx->tx_lnetmsg != NULL) {
433 CNETERR("Deleting packet type %d len %d %s->%s\n",
434 le32_to_cpu(tx->tx_lnetmsg->msg_hdr.type),
435 le32_to_cpu(tx->tx_lnetmsg->msg_hdr.payload_length),
436 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
437 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
439 CNETERR("Deleting noop packet\n");
442 list_del(&tx->tx_list);
444 if (tx->tx_hstatus == LNET_MSG_STATUS_OK) {
445 if (error == -ETIMEDOUT)
447 LNET_MSG_STATUS_LOCAL_TIMEOUT;
448 else if (error == -ENETDOWN ||
449 error == -EHOSTUNREACH ||
450 error == -ENETUNREACH ||
451 error == -ECONNREFUSED ||
452 error == -ECONNRESET)
453 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
455 * for all other errors we don't want to
459 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
462 LASSERT(atomic_read(&tx->tx_refcount) == 1);
463 ksocknal_tx_done(ni, tx, error);
468 ksocknal_check_zc_req(struct ksock_tx *tx)
470 struct ksock_conn *conn = tx->tx_conn;
471 struct ksock_peer_ni *peer_ni = conn->ksnc_peer;
473 /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
474 * to ksnp_zc_req_list if some fragment of this message should be sent
475 * zero-copy. Our peer_ni will send an ACK containing this cookie when
476 * she has received this message to tell us we can signal completion.
477 * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
478 * ksnp_zc_req_list. */
479 LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
480 LASSERT (tx->tx_zc_capable);
482 tx->tx_zc_checked = 1;
484 if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
485 !conn->ksnc_zc_capable)
488 /* assign cookie and queue tx to pending list, it will be released when
489 * a matching ack is received. See ksocknal_handle_zcack() */
491 ksocknal_tx_addref(tx);
493 spin_lock(&peer_ni->ksnp_lock);
495 /* ZC_REQ is going to be pinned to the peer_ni */
496 tx->tx_deadline = ktime_get_seconds() +
497 lnet_get_lnd_timeout();
499 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
501 tx->tx_msg.ksm_zc_cookies[0] = peer_ni->ksnp_zc_next_cookie++;
503 if (peer_ni->ksnp_zc_next_cookie == 0)
504 peer_ni->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
506 list_add_tail(&tx->tx_zc_list, &peer_ni->ksnp_zc_req_list);
508 spin_unlock(&peer_ni->ksnp_lock);
512 ksocknal_uncheck_zc_req(struct ksock_tx *tx)
514 struct ksock_peer_ni *peer_ni = tx->tx_conn->ksnc_peer;
516 LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
517 LASSERT(tx->tx_zc_capable);
519 tx->tx_zc_checked = 0;
521 spin_lock(&peer_ni->ksnp_lock);
523 if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
524 /* Not waiting for an ACK */
525 spin_unlock(&peer_ni->ksnp_lock);
529 tx->tx_msg.ksm_zc_cookies[0] = 0;
530 list_del(&tx->tx_zc_list);
532 spin_unlock(&peer_ni->ksnp_lock);
534 ksocknal_tx_decref(tx);
538 ksocknal_process_transmit(struct ksock_conn *conn, struct ksock_tx *tx,
539 struct kvec *scratch_iov)
542 bool error_sim = false;
544 if (lnet_send_error_simulation(tx->tx_lnetmsg, &tx->tx_hstatus)) {
550 if (tx->tx_zc_capable && !tx->tx_zc_checked)
551 ksocknal_check_zc_req(tx);
553 rc = ksocknal_transmit(conn, tx, scratch_iov);
555 CDEBUG(D_NET, "send(%d) %d\n", tx->tx_resid, rc);
557 if (tx->tx_resid == 0) {
558 /* Sent everything OK */
570 counter++; /* exponential backoff warnings */
571 if ((counter & (-counter)) == counter)
572 CWARN("%u ENOMEM tx %p (%u allocated)\n",
573 counter, conn, atomic_read(&libcfs_kmemory));
575 /* Queue on ksnd_enomem_conns for retry after a timeout */
576 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
578 /* enomem list takes over scheduler's ref... */
579 LASSERT(conn->ksnc_tx_scheduled);
580 list_add_tail(&conn->ksnc_tx_list,
581 &ksocknal_data.ksnd_enomem_conns);
582 if (ktime_get_seconds() + SOCKNAL_ENOMEM_RETRY <
583 ksocknal_data.ksnd_reaper_waketime)
584 wake_up(&ksocknal_data.ksnd_reaper_waitq);
586 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
589 * set the health status of the message which determines
590 * whether we should retry the transmit
592 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
603 * set the health status of the message which determines
604 * whether we should retry the transmit
606 if (rc == -ETIMEDOUT)
607 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_TIMEOUT;
609 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
612 if (!conn->ksnc_closing) {
615 LCONSOLE_WARN("Host %pI4h reset our connection "
616 "while we were sending data; it may have "
621 LCONSOLE_WARN("There was an unexpected network error "
622 "while writing to %pI4h: %d.\n",
623 &conn->ksnc_ipaddr, rc);
626 CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pI4h:%d\n",
627 conn, rc, libcfs_id2str(conn->ksnc_peer->ksnp_id),
628 &conn->ksnc_ipaddr, conn->ksnc_port);
631 if (tx->tx_zc_checked)
632 ksocknal_uncheck_zc_req(tx);
634 /* it's not an error if conn is being closed */
635 ksocknal_close_conn_and_siblings(conn,
636 (conn->ksnc_closing) ? 0 : rc);
642 ksocknal_launch_connection_locked(struct ksock_route *route)
645 /* called holding write lock on ksnd_global_lock */
647 LASSERT (!route->ksnr_scheduled);
648 LASSERT (!route->ksnr_connecting);
649 LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
651 route->ksnr_scheduled = 1; /* scheduling conn for connd */
652 ksocknal_route_addref(route); /* extra ref for connd */
654 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
656 list_add_tail(&route->ksnr_connd_list,
657 &ksocknal_data.ksnd_connd_routes);
658 wake_up(&ksocknal_data.ksnd_connd_waitq);
660 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
664 ksocknal_launch_all_connections_locked(struct ksock_peer_ni *peer_ni)
666 struct ksock_route *route;
668 /* called holding write lock on ksnd_global_lock */
670 /* launch any/all connections that need it */
671 route = ksocknal_find_connectable_route_locked(peer_ni);
675 ksocknal_launch_connection_locked(route);
680 ksocknal_find_conn_locked(struct ksock_peer_ni *peer_ni, struct ksock_tx *tx, int nonblk)
682 struct list_head *tmp;
683 struct ksock_conn *conn;
684 struct ksock_conn *typed = NULL;
685 struct ksock_conn *fallback = NULL;
689 list_for_each(tmp, &peer_ni->ksnp_conns) {
690 struct ksock_conn *c = list_entry(tmp, struct ksock_conn,
692 int nob = atomic_read(&c->ksnc_tx_nob) +
693 c->ksnc_sock->sk->sk_wmem_queued;
696 LASSERT (!c->ksnc_closing);
697 LASSERT (c->ksnc_proto != NULL &&
698 c->ksnc_proto->pro_match_tx != NULL);
700 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
705 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
708 case SOCKNAL_MATCH_YES: /* typed connection */
709 if (typed == NULL || tnob > nob ||
710 (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
711 typed->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
717 case SOCKNAL_MATCH_MAY: /* fallback connection */
718 if (fallback == NULL || fnob > nob ||
719 (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
720 fallback->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
728 /* prefer the typed selection */
729 conn = (typed != NULL) ? typed : fallback;
732 conn->ksnc_tx_last_post = ktime_get_seconds();
738 ksocknal_tx_prep(struct ksock_conn *conn, struct ksock_tx *tx)
740 conn->ksnc_proto->pro_pack(tx);
742 atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
743 ksocknal_conn_addref(conn); /* +1 ref for tx */
748 ksocknal_queue_tx_locked(struct ksock_tx *tx, struct ksock_conn *conn)
750 struct ksock_sched *sched = conn->ksnc_scheduler;
751 struct ksock_msg *msg = &tx->tx_msg;
752 struct ksock_tx *ztx = NULL;
755 /* called holding global lock (read or irq-write) and caller may
756 * not have dropped this lock between finding conn and calling me,
757 * so we don't need the {get,put}connsock dance to deref
759 LASSERT(!conn->ksnc_closing);
761 CDEBUG(D_NET, "Sending to %s ip %pI4h:%d\n",
762 libcfs_id2str(conn->ksnc_peer->ksnp_id),
763 &conn->ksnc_ipaddr, conn->ksnc_port);
765 ksocknal_tx_prep(conn, tx);
767 /* Ensure the frags we've been given EXACTLY match the number of
768 * bytes we want to send. Many TCP/IP stacks disregard any total
769 * size parameters passed to them and just look at the frags.
771 * We always expect at least 1 mapped fragment containing the
772 * complete ksocknal message header. */
773 LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
774 lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
775 (unsigned int)tx->tx_nob);
776 LASSERT (tx->tx_niov >= 1);
777 LASSERT (tx->tx_resid == tx->tx_nob);
779 CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
780 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
782 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
784 bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
785 spin_lock_bh(&sched->kss_lock);
787 if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
788 /* First packet starts the timeout */
789 conn->ksnc_tx_deadline = ktime_get_seconds() +
790 lnet_get_lnd_timeout();
791 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
792 conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
793 conn->ksnc_tx_bufnob = 0;
794 smp_mb(); /* order with adding to tx_queue */
797 if (msg->ksm_type == KSOCK_MSG_NOOP) {
798 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
799 * on a normal packet so I don't need to send it */
800 LASSERT (msg->ksm_zc_cookies[1] != 0);
801 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
803 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
804 ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
807 /* It's a normal packet - can it piggback a noop zc-ack that
808 * has been queued already? */
809 LASSERT (msg->ksm_zc_cookies[1] == 0);
810 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
812 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
813 /* ztx will be released later */
817 atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
818 list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
821 if (conn->ksnc_tx_ready && /* able to send */
822 !conn->ksnc_tx_scheduled) { /* not scheduled to send */
823 /* +1 ref for scheduler */
824 ksocknal_conn_addref(conn);
825 list_add_tail(&conn->ksnc_tx_list,
826 &sched->kss_tx_conns);
827 conn->ksnc_tx_scheduled = 1;
828 wake_up(&sched->kss_waitq);
831 spin_unlock_bh(&sched->kss_lock);
836 ksocknal_find_connectable_route_locked(struct ksock_peer_ni *peer_ni)
838 time64_t now = ktime_get_seconds();
839 struct list_head *tmp;
840 struct ksock_route *route;
842 list_for_each(tmp, &peer_ni->ksnp_routes) {
843 route = list_entry(tmp, struct ksock_route, ksnr_list);
845 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
847 if (route->ksnr_scheduled) /* connections being established */
850 /* all route types connected ? */
851 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
854 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
855 now >= route->ksnr_timeout)) {
857 "Too soon to retry route %pI4h "
858 "(cnted %d, interval %lld, %lld secs later)\n",
860 route->ksnr_connected,
861 route->ksnr_retry_interval,
862 route->ksnr_timeout - now);
873 ksocknal_find_connecting_route_locked(struct ksock_peer_ni *peer_ni)
875 struct list_head *tmp;
876 struct ksock_route *route;
878 list_for_each(tmp, &peer_ni->ksnp_routes) {
879 route = list_entry(tmp, struct ksock_route, ksnr_list);
881 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
883 if (route->ksnr_scheduled)
891 ksocknal_launch_packet(struct lnet_ni *ni, struct ksock_tx *tx,
892 struct lnet_process_id id)
894 struct ksock_peer_ni *peer_ni;
895 struct ksock_conn *conn;
900 LASSERT (tx->tx_conn == NULL);
902 g_lock = &ksocknal_data.ksnd_global_lock;
904 for (retry = 0;; retry = 1) {
906 peer_ni = ksocknal_find_peer_locked(ni, id);
907 if (peer_ni != NULL) {
908 if (ksocknal_find_connectable_route_locked(peer_ni) == NULL) {
909 conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
911 /* I've got no routes that need to be
912 * connecting and I do have an actual
914 ksocknal_queue_tx_locked (tx, conn);
921 /* I'll need a write lock... */
924 write_lock_bh(g_lock);
926 peer_ni = ksocknal_find_peer_locked(ni, id);
930 write_unlock_bh(g_lock);
932 if ((id.pid & LNET_PID_USERFLAG) != 0) {
933 CERROR("Refusing to create a connection to "
934 "userspace process %s\n", libcfs_id2str(id));
935 return -EHOSTUNREACH;
939 CERROR("Can't find peer_ni %s\n", libcfs_id2str(id));
940 return -EHOSTUNREACH;
943 rc = ksocknal_add_peer(ni, id,
944 LNET_NIDADDR(id.nid),
945 lnet_acceptor_port());
947 CERROR("Can't add peer_ni %s: %d\n",
948 libcfs_id2str(id), rc);
953 ksocknal_launch_all_connections_locked(peer_ni);
955 conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
957 /* Connection exists; queue message on it */
958 ksocknal_queue_tx_locked (tx, conn);
959 write_unlock_bh(g_lock);
963 if (peer_ni->ksnp_accepting > 0 ||
964 ksocknal_find_connecting_route_locked (peer_ni) != NULL) {
965 /* the message is going to be pinned to the peer_ni */
966 tx->tx_deadline = ktime_get_seconds() +
967 lnet_get_lnd_timeout();
969 /* Queue the message until a connection is established */
970 list_add_tail(&tx->tx_list, &peer_ni->ksnp_tx_queue);
971 write_unlock_bh(g_lock);
975 write_unlock_bh(g_lock);
977 /* NB Routes may be ignored if connections to them failed recently */
978 CNETERR("No usable routes to %s\n", libcfs_id2str(id));
979 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
980 return (-EHOSTUNREACH);
984 ksocknal_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
986 /* '1' for consistency with code that checks !mpflag to restore */
987 unsigned int mpflag = 1;
988 int type = lntmsg->msg_type;
989 struct lnet_process_id target = lntmsg->msg_target;
990 unsigned int payload_niov = lntmsg->msg_niov;
991 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
992 unsigned int payload_offset = lntmsg->msg_offset;
993 unsigned int payload_nob = lntmsg->msg_len;
998 /* NB 'private' is different depending on what we're sending.
999 * Just ignore it... */
1001 CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
1002 payload_nob, payload_niov, libcfs_id2str(target));
1004 LASSERT (payload_nob == 0 || payload_niov > 0);
1005 LASSERT (payload_niov <= LNET_MAX_IOV);
1006 LASSERT (!in_interrupt ());
1008 desc_size = offsetof(struct ksock_tx,
1009 tx_frags.paged.kiov[payload_niov]);
1011 if (lntmsg->msg_vmflush)
1012 mpflag = memalloc_noreclaim_save();
1014 tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
1016 CERROR("Can't allocate tx desc type %d size %d\n",
1018 if (lntmsg->msg_vmflush)
1019 memalloc_noreclaim_restore(mpflag);
1023 tx->tx_conn = NULL; /* set when assigned a conn */
1024 tx->tx_lnetmsg = lntmsg;
1027 tx->tx_iov = &tx->tx_frags.paged.iov;
1028 tx->tx_kiov = tx->tx_frags.paged.kiov;
1029 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
1030 payload_niov, payload_kiov,
1031 payload_offset, payload_nob);
1033 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
1034 tx->tx_zc_capable = 1;
1036 tx->tx_msg.ksm_csum = 0;
1037 tx->tx_msg.ksm_type = KSOCK_MSG_LNET;
1038 tx->tx_msg.ksm_zc_cookies[0] = 0;
1039 tx->tx_msg.ksm_zc_cookies[1] = 0;
1041 /* The first fragment will be set later in pro_pack */
1042 rc = ksocknal_launch_packet(ni, tx, target);
1044 * We can't test lntsmg->msg_vmflush again as lntmsg may
1048 memalloc_noreclaim_restore(mpflag);
1053 lntmsg->msg_health_status = tx->tx_hstatus;
1054 ksocknal_free_tx(tx);
1059 ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
1061 struct task_struct *task = kthread_run(fn, arg, name);
1064 return PTR_ERR(task);
1066 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1067 ksocknal_data.ksnd_nthreads++;
1068 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1073 ksocknal_thread_fini (void)
1075 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1076 if (--ksocknal_data.ksnd_nthreads == 0)
1077 wake_up_var(&ksocknal_data.ksnd_nthreads);
1078 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1082 ksocknal_new_packet(struct ksock_conn *conn, int nob_to_skip)
1084 static char ksocknal_slop_buffer[4096];
1089 LASSERT(conn->ksnc_proto != NULL);
1091 if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1092 /* Remind the socket to ack eagerly... */
1093 ksocknal_lib_eager_ack(conn);
1096 if (nob_to_skip == 0) { /* right at next packet boundary now */
1097 conn->ksnc_rx_started = 0;
1098 smp_mb(); /* racing with timeout thread */
1100 switch (conn->ksnc_proto->pro_version) {
1101 case KSOCK_PROTO_V2:
1102 case KSOCK_PROTO_V3:
1103 conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1104 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1105 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1107 conn->ksnc_rx_nob_wanted = offsetof(struct ksock_msg, ksm_u);
1108 conn->ksnc_rx_nob_left = offsetof(struct ksock_msg, ksm_u);
1109 conn->ksnc_rx_iov[0].iov_len = offsetof(struct ksock_msg, ksm_u);
1112 case KSOCK_PROTO_V1:
1113 /* Receiving bare struct lnet_hdr */
1114 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1115 conn->ksnc_rx_nob_wanted = sizeof(struct lnet_hdr);
1116 conn->ksnc_rx_nob_left = sizeof(struct lnet_hdr);
1118 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1119 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1120 conn->ksnc_rx_iov[0].iov_len = sizeof(struct lnet_hdr);
1126 conn->ksnc_rx_niov = 1;
1128 conn->ksnc_rx_kiov = NULL;
1129 conn->ksnc_rx_nkiov = 0;
1130 conn->ksnc_rx_csum = ~0;
1134 /* Set up to skip as much as possible now. If there's more left
1135 * (ran out of iov entries) we'll get called again */
1137 conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1138 conn->ksnc_rx_nob_left = nob_to_skip;
1139 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1144 nob = min_t(int, nob_to_skip, sizeof(ksocknal_slop_buffer));
1146 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1147 conn->ksnc_rx_iov[niov].iov_len = nob;
1152 } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
1153 niov < sizeof(conn->ksnc_rx_iov_space) / sizeof(struct kvec));
1155 conn->ksnc_rx_niov = niov;
1156 conn->ksnc_rx_kiov = NULL;
1157 conn->ksnc_rx_nkiov = 0;
1158 conn->ksnc_rx_nob_wanted = skipped;
1163 ksocknal_process_receive(struct ksock_conn *conn,
1164 struct page **rx_scratch_pgs,
1165 struct kvec *scratch_iov)
1167 struct lnet_hdr *lhdr;
1168 struct lnet_process_id *id;
1171 LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
1173 /* NB: sched lock NOT held */
1174 /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
1175 LASSERT(conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1176 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1177 conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1178 conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1180 if (conn->ksnc_rx_nob_wanted != 0) {
1181 rc = ksocknal_receive(conn, rx_scratch_pgs,
1185 struct lnet_process_id ksnp_id;
1187 ksnp_id = conn->ksnc_peer->ksnp_id;
1189 LASSERT(rc != -EAGAIN);
1191 CDEBUG(D_NET, "[%p] EOF from %s "
1192 "ip %pI4h:%d\n", conn,
1193 libcfs_id2str(ksnp_id),
1196 else if (!conn->ksnc_closing)
1197 CERROR("[%p] Error %d on read from %s "
1198 "ip %pI4h:%d\n", conn, rc,
1199 libcfs_id2str(ksnp_id),
1203 /* it's not an error if conn is being closed */
1204 ksocknal_close_conn_and_siblings (conn,
1205 (conn->ksnc_closing) ? 0 : rc);
1206 return (rc == 0 ? -ESHUTDOWN : rc);
1209 if (conn->ksnc_rx_nob_wanted != 0) {
1214 switch (conn->ksnc_rx_state) {
1215 case SOCKNAL_RX_KSM_HEADER:
1216 if (conn->ksnc_flip) {
1217 __swab32s(&conn->ksnc_msg.ksm_type);
1218 __swab32s(&conn->ksnc_msg.ksm_csum);
1219 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1220 __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1223 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1224 conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1225 CERROR("%s: Unknown message type: %x\n",
1226 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1227 conn->ksnc_msg.ksm_type);
1228 ksocknal_new_packet(conn, 0);
1229 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1233 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1234 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1235 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1236 /* NOOP Checksum error */
1237 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1238 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1239 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1240 ksocknal_new_packet(conn, 0);
1241 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1245 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1248 LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1250 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1251 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1253 rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1254 conn->ksnc_msg.ksm_zc_cookies[1]);
1257 CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
1258 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1259 cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1260 ksocknal_new_packet(conn, 0);
1261 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1266 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1267 ksocknal_new_packet (conn, 0);
1268 return 0; /* NOOP is done and just return */
1271 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1272 conn->ksnc_rx_nob_wanted = sizeof(struct ksock_lnet_msg);
1273 conn->ksnc_rx_nob_left = sizeof(struct ksock_lnet_msg);
1275 conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
1276 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1277 conn->ksnc_rx_iov[0].iov_len = sizeof(struct ksock_lnet_msg);
1279 conn->ksnc_rx_niov = 1;
1280 conn->ksnc_rx_kiov = NULL;
1281 conn->ksnc_rx_nkiov = 0;
1283 goto again; /* read lnet header now */
1285 case SOCKNAL_RX_LNET_HEADER:
1286 /* unpack message header */
1287 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1289 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1290 /* Userspace peer_ni */
1291 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1292 id = &conn->ksnc_peer->ksnp_id;
1294 /* Substitute process ID assigned at connection time */
1295 lhdr->src_pid = cpu_to_le32(id->pid);
1296 lhdr->src_nid = cpu_to_le64(id->nid);
1299 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1300 ksocknal_conn_addref(conn); /* ++ref while parsing */
1302 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1303 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1304 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1306 /* I just received garbage: give up on this conn */
1307 ksocknal_new_packet(conn, 0);
1308 ksocknal_close_conn_and_siblings (conn, rc);
1309 ksocknal_conn_decref(conn);
1313 /* I'm racing with ksocknal_recv() */
1314 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1315 conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1317 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1320 /* ksocknal_recv() got called */
1323 case SOCKNAL_RX_LNET_PAYLOAD:
1324 /* payload all received */
1327 if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
1328 conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
1329 conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1330 CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1331 libcfs_id2str(conn->ksnc_peer->ksnp_id),
1332 conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1336 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1337 LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1339 lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1340 id = &conn->ksnc_peer->ksnp_id;
1342 rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1343 conn->ksnc_msg.ksm_zc_cookies[0],
1344 *ksocknal_tunables.ksnd_nonblk_zcack ||
1345 le64_to_cpu(lhdr->src_nid) != id->nid);
1348 if (rc && conn->ksnc_lnet_msg)
1349 conn->ksnc_lnet_msg->msg_health_status =
1350 LNET_MSG_STATUS_REMOTE_ERROR;
1351 lnet_finalize(conn->ksnc_lnet_msg, rc);
1354 ksocknal_new_packet(conn, 0);
1355 ksocknal_close_conn_and_siblings (conn, rc);
1360 case SOCKNAL_RX_SLOP:
1361 /* starting new packet? */
1362 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1363 return 0; /* come back later */
1364 goto again; /* try to finish reading slop now */
1372 return (-EINVAL); /* keep gcc happy */
1376 ksocknal_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
1377 int delayed, unsigned int niov,
1378 struct bio_vec *kiov, unsigned int offset, unsigned int mlen,
1381 struct ksock_conn *conn = private;
1382 struct ksock_sched *sched = conn->ksnc_scheduler;
1384 LASSERT (mlen <= rlen);
1385 LASSERT (niov <= LNET_MAX_IOV);
1387 conn->ksnc_lnet_msg = msg;
1388 conn->ksnc_rx_nob_wanted = mlen;
1389 conn->ksnc_rx_nob_left = rlen;
1392 conn->ksnc_rx_nkiov = 0;
1393 conn->ksnc_rx_kiov = NULL;
1394 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1395 conn->ksnc_rx_niov =
1396 lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
1397 niov, NULL, offset, mlen);
1399 conn->ksnc_rx_niov = 0;
1400 conn->ksnc_rx_iov = NULL;
1401 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1402 conn->ksnc_rx_nkiov =
1403 lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1404 niov, kiov, offset, mlen);
1408 lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1409 lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1411 LASSERT (conn->ksnc_rx_scheduled);
1413 spin_lock_bh(&sched->kss_lock);
1415 switch (conn->ksnc_rx_state) {
1416 case SOCKNAL_RX_PARSE_WAIT:
1417 list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1418 wake_up(&sched->kss_waitq);
1419 LASSERT(conn->ksnc_rx_ready);
1422 case SOCKNAL_RX_PARSE:
1423 /* scheduler hasn't noticed I'm parsing yet */
1427 conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1429 spin_unlock_bh(&sched->kss_lock);
1430 ksocknal_conn_decref(conn);
1435 ksocknal_sched_cansleep(struct ksock_sched *sched)
1439 spin_lock_bh(&sched->kss_lock);
1441 rc = (!ksocknal_data.ksnd_shuttingdown &&
1442 list_empty(&sched->kss_rx_conns) &&
1443 list_empty(&sched->kss_tx_conns));
1445 spin_unlock_bh(&sched->kss_lock);
1449 int ksocknal_scheduler(void *arg)
1451 struct ksock_sched *sched;
1452 struct ksock_conn *conn;
1453 struct ksock_tx *tx;
1456 long id = (long)arg;
1457 struct page **rx_scratch_pgs;
1458 struct kvec *scratch_iov;
1460 sched = ksocknal_data.ksnd_schedulers[KSOCK_THREAD_CPT(id)];
1462 LIBCFS_CPT_ALLOC(rx_scratch_pgs, lnet_cpt_table(), sched->kss_cpt,
1463 sizeof(*rx_scratch_pgs) * LNET_MAX_IOV);
1464 if (!rx_scratch_pgs) {
1465 CERROR("Unable to allocate scratch pages\n");
1469 LIBCFS_CPT_ALLOC(scratch_iov, lnet_cpt_table(), sched->kss_cpt,
1470 sizeof(*scratch_iov) * LNET_MAX_IOV);
1472 CERROR("Unable to allocate scratch iov\n");
1476 rc = cfs_cpt_bind(lnet_cpt_table(), sched->kss_cpt);
1478 CWARN("Can't set CPU partition affinity to %d: %d\n",
1479 sched->kss_cpt, rc);
1482 spin_lock_bh(&sched->kss_lock);
1484 while (!ksocknal_data.ksnd_shuttingdown) {
1485 int did_something = 0;
1487 /* Ensure I progress everything semi-fairly */
1489 if (!list_empty(&sched->kss_rx_conns)) {
1490 conn = list_entry(sched->kss_rx_conns.next,
1491 struct ksock_conn, ksnc_rx_list);
1492 list_del(&conn->ksnc_rx_list);
1494 LASSERT(conn->ksnc_rx_scheduled);
1495 LASSERT(conn->ksnc_rx_ready);
1497 /* clear rx_ready in case receive isn't complete.
1498 * Do it BEFORE we call process_recv, since
1499 * data_ready can set it any time after we release
1501 conn->ksnc_rx_ready = 0;
1502 spin_unlock_bh(&sched->kss_lock);
1504 rc = ksocknal_process_receive(conn, rx_scratch_pgs,
1507 spin_lock_bh(&sched->kss_lock);
1509 /* I'm the only one that can clear this flag */
1510 LASSERT(conn->ksnc_rx_scheduled);
1512 /* Did process_receive get everything it wanted? */
1514 conn->ksnc_rx_ready = 1;
1516 if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1517 /* Conn blocked waiting for ksocknal_recv()
1518 * I change its state (under lock) to signal
1519 * it can be rescheduled */
1520 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1521 } else if (conn->ksnc_rx_ready) {
1522 /* reschedule for rx */
1523 list_add_tail(&conn->ksnc_rx_list,
1524 &sched->kss_rx_conns);
1526 conn->ksnc_rx_scheduled = 0;
1528 ksocknal_conn_decref(conn);
1534 if (!list_empty(&sched->kss_tx_conns)) {
1537 list_splice_init(&sched->kss_zombie_noop_txs, &zlist);
1539 conn = list_entry(sched->kss_tx_conns.next,
1540 struct ksock_conn, ksnc_tx_list);
1541 list_del(&conn->ksnc_tx_list);
1543 LASSERT(conn->ksnc_tx_scheduled);
1544 LASSERT(conn->ksnc_tx_ready);
1545 LASSERT(!list_empty(&conn->ksnc_tx_queue));
1547 tx = list_entry(conn->ksnc_tx_queue.next,
1548 struct ksock_tx, tx_list);
1550 if (conn->ksnc_tx_carrier == tx)
1551 ksocknal_next_tx_carrier(conn);
1553 /* dequeue now so empty list => more to send */
1554 list_del(&tx->tx_list);
1556 /* Clear tx_ready in case send isn't complete. Do
1557 * it BEFORE we call process_transmit, since
1558 * write_space can set it any time after we release
1560 conn->ksnc_tx_ready = 0;
1561 spin_unlock_bh(&sched->kss_lock);
1563 if (!list_empty(&zlist)) {
1564 /* free zombie noop txs, it's fast because
1565 * noop txs are just put in freelist */
1566 ksocknal_txlist_done(NULL, &zlist, 0);
1569 rc = ksocknal_process_transmit(conn, tx, scratch_iov);
1571 if (rc == -ENOMEM || rc == -EAGAIN) {
1572 /* Incomplete send: replace tx on HEAD of tx_queue */
1573 spin_lock_bh(&sched->kss_lock);
1574 list_add(&tx->tx_list,
1575 &conn->ksnc_tx_queue);
1577 /* Complete send; tx -ref */
1578 ksocknal_tx_decref(tx);
1580 spin_lock_bh(&sched->kss_lock);
1581 /* assume space for more */
1582 conn->ksnc_tx_ready = 1;
1585 if (rc == -ENOMEM) {
1586 /* Do nothing; after a short timeout, this
1587 * conn will be reposted on kss_tx_conns. */
1588 } else if (conn->ksnc_tx_ready &&
1589 !list_empty(&conn->ksnc_tx_queue)) {
1590 /* reschedule for tx */
1591 list_add_tail(&conn->ksnc_tx_list,
1592 &sched->kss_tx_conns);
1594 conn->ksnc_tx_scheduled = 0;
1596 ksocknal_conn_decref(conn);
1601 if (!did_something || /* nothing to do */
1602 ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
1603 spin_unlock_bh(&sched->kss_lock);
1607 if (!did_something) { /* wait for something to do */
1608 rc = wait_event_interruptible_exclusive(
1610 !ksocknal_sched_cansleep(sched));
1616 spin_lock_bh(&sched->kss_lock);
1620 spin_unlock_bh(&sched->kss_lock);
1621 CFS_FREE_PTR_ARRAY(rx_scratch_pgs, LNET_MAX_IOV);
1622 CFS_FREE_PTR_ARRAY(scratch_iov, LNET_MAX_IOV);
1623 ksocknal_thread_fini();
1628 * Add connection to kss_rx_conns of scheduler
1629 * and wakeup the scheduler.
1631 void ksocknal_read_callback(struct ksock_conn *conn)
1633 struct ksock_sched *sched;
1636 sched = conn->ksnc_scheduler;
1638 spin_lock_bh(&sched->kss_lock);
1640 conn->ksnc_rx_ready = 1;
1642 if (!conn->ksnc_rx_scheduled) { /* not being progressed */
1643 list_add_tail(&conn->ksnc_rx_list,
1644 &sched->kss_rx_conns);
1645 conn->ksnc_rx_scheduled = 1;
1646 /* extra ref for scheduler */
1647 ksocknal_conn_addref(conn);
1649 wake_up (&sched->kss_waitq);
1651 spin_unlock_bh(&sched->kss_lock);
1657 * Add connection to kss_tx_conns of scheduler
1658 * and wakeup the scheduler.
1660 void ksocknal_write_callback(struct ksock_conn *conn)
1662 struct ksock_sched *sched;
1665 sched = conn->ksnc_scheduler;
1667 spin_lock_bh(&sched->kss_lock);
1669 conn->ksnc_tx_ready = 1;
1671 if (!conn->ksnc_tx_scheduled && /* not being progressed */
1672 !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
1673 list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
1674 conn->ksnc_tx_scheduled = 1;
1675 /* extra ref for scheduler */
1676 ksocknal_conn_addref(conn);
1678 wake_up(&sched->kss_waitq);
1681 spin_unlock_bh(&sched->kss_lock);
1686 static const struct ksock_proto *
1687 ksocknal_parse_proto_version(struct ksock_hello_msg *hello)
1691 if (hello->kshm_magic == LNET_PROTO_MAGIC)
1692 version = hello->kshm_version;
1693 else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1694 version = __swab32(hello->kshm_version);
1697 #if SOCKNAL_VERSION_DEBUG
1698 if (*ksocknal_tunables.ksnd_protocol == 1)
1701 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1702 version == KSOCK_PROTO_V3)
1705 if (version == KSOCK_PROTO_V2)
1706 return &ksocknal_protocol_v2x;
1708 if (version == KSOCK_PROTO_V3)
1709 return &ksocknal_protocol_v3x;
1714 if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1715 struct lnet_magicversion *hmv;
1717 BUILD_BUG_ON(sizeof(struct lnet_magicversion) !=
1718 offsetof(struct ksock_hello_msg, kshm_src_nid));
1720 hmv = (struct lnet_magicversion *)hello;
1722 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1723 hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1724 return &ksocknal_protocol_v1x;
1731 ksocknal_send_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1732 lnet_nid_t peer_nid, struct ksock_hello_msg *hello)
1734 /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1735 struct ksock_net *net = (struct ksock_net *)ni->ni_data;
1737 LASSERT(hello->kshm_nips <= LNET_INTERFACES_NUM);
1739 /* rely on caller to hold a ref on socket so it wouldn't disappear */
1740 LASSERT(conn->ksnc_proto != NULL);
1742 hello->kshm_src_nid = ni->ni_nid;
1743 hello->kshm_dst_nid = peer_nid;
1744 hello->kshm_src_pid = the_lnet.ln_pid;
1746 hello->kshm_src_incarnation = net->ksnn_incarnation;
1747 hello->kshm_ctype = conn->ksnc_type;
1749 return conn->ksnc_proto->pro_send_hello(conn, hello);
1753 ksocknal_invert_type(int type)
1757 case SOCKLND_CONN_ANY:
1758 case SOCKLND_CONN_CONTROL:
1760 case SOCKLND_CONN_BULK_IN:
1761 return SOCKLND_CONN_BULK_OUT;
1762 case SOCKLND_CONN_BULK_OUT:
1763 return SOCKLND_CONN_BULK_IN;
1765 return (SOCKLND_CONN_NONE);
1770 ksocknal_recv_hello(struct lnet_ni *ni, struct ksock_conn *conn,
1771 struct ksock_hello_msg *hello,
1772 struct lnet_process_id *peerid,
1775 /* Return < 0 fatal error
1777 * EALREADY lost connection race
1778 * EPROTO protocol version mismatch
1780 struct socket *sock = conn->ksnc_sock;
1781 int active = (conn->ksnc_proto != NULL);
1785 const struct ksock_proto *proto;
1786 struct lnet_process_id recv_id;
1788 /* socket type set on active connections - not set on passive */
1789 LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1791 timeout = active ? lnet_get_lnd_timeout() :
1792 lnet_acceptor_timeout();
1794 rc = lnet_sock_read(sock, &hello->kshm_magic,
1795 sizeof(hello->kshm_magic), timeout);
1797 CERROR("Error %d reading HELLO from %pI4h\n",
1798 rc, &conn->ksnc_ipaddr);
1803 if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1804 hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1805 hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1806 /* Unexpected magic! */
1807 CERROR ("Bad magic(1) %#08x (%#08x expected) from "
1808 "%pI4h\n", __cpu_to_le32 (hello->kshm_magic),
1809 LNET_PROTO_TCP_MAGIC, &conn->ksnc_ipaddr);
1813 rc = lnet_sock_read(sock, &hello->kshm_version,
1814 sizeof(hello->kshm_version), timeout);
1816 CERROR("Error %d reading HELLO from %pI4h\n",
1817 rc, &conn->ksnc_ipaddr);
1822 proto = ksocknal_parse_proto_version(hello);
1823 if (proto == NULL) {
1825 /* unknown protocol from peer_ni, tell peer_ni my protocol */
1826 conn->ksnc_proto = &ksocknal_protocol_v3x;
1827 #if SOCKNAL_VERSION_DEBUG
1828 if (*ksocknal_tunables.ksnd_protocol == 2)
1829 conn->ksnc_proto = &ksocknal_protocol_v2x;
1830 else if (*ksocknal_tunables.ksnd_protocol == 1)
1831 conn->ksnc_proto = &ksocknal_protocol_v1x;
1833 hello->kshm_nips = 0;
1834 ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1837 CERROR("Unknown protocol version (%d.x expected) from %pI4h\n",
1838 conn->ksnc_proto->pro_version, &conn->ksnc_ipaddr);
1843 proto_match = (conn->ksnc_proto == proto);
1844 conn->ksnc_proto = proto;
1846 /* receive the rest of hello message anyway */
1847 rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1849 CERROR("Error %d reading or checking hello from from %pI4h\n",
1850 rc, &conn->ksnc_ipaddr);
1855 *incarnation = hello->kshm_src_incarnation;
1857 if (hello->kshm_src_nid == LNET_NID_ANY) {
1858 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY from %pI4h\n",
1859 &conn->ksnc_ipaddr);
1864 conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1865 /* Userspace NAL assigns peer_ni process ID from socket */
1866 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1867 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1869 recv_id.nid = hello->kshm_src_nid;
1870 recv_id.pid = hello->kshm_src_pid;
1876 /* peer_ni determines type */
1877 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1878 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1879 CERROR("Unexpected type %d from %s ip %pI4h\n",
1880 hello->kshm_ctype, libcfs_id2str(*peerid),
1881 &conn->ksnc_ipaddr);
1887 if (peerid->pid != recv_id.pid ||
1888 peerid->nid != recv_id.nid) {
1889 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1890 " %pI4h, but they claimed they were "
1891 "%s; please check your Lustre "
1893 libcfs_id2str(*peerid),
1895 libcfs_id2str(recv_id));
1899 if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1900 /* Possible protocol mismatch or I lost the connection race */
1901 return proto_match ? EALREADY : EPROTO;
1904 if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1905 CERROR("Mismatched types: me %d, %s ip %pI4h %d\n",
1906 conn->ksnc_type, libcfs_id2str(*peerid),
1915 ksocknal_connect(struct ksock_route *route)
1918 struct ksock_peer_ni *peer_ni = route->ksnr_peer;
1921 struct socket *sock;
1923 int retry_later = 0;
1926 deadline = ktime_get_seconds() + lnet_get_lnd_timeout();
1928 write_lock_bh(&ksocknal_data.ksnd_global_lock);
1930 LASSERT (route->ksnr_scheduled);
1931 LASSERT (!route->ksnr_connecting);
1933 route->ksnr_connecting = 1;
1936 wanted = ksocknal_route_mask() & ~route->ksnr_connected;
1938 /* stop connecting if peer_ni/route got closed under me, or
1939 * route got connected while queued */
1940 if (peer_ni->ksnp_closing || route->ksnr_deleted ||
1946 /* reschedule if peer_ni is connecting to me */
1947 if (peer_ni->ksnp_accepting > 0) {
1949 "peer_ni %s(%d) already connecting to me, retry later.\n",
1950 libcfs_nid2str(peer_ni->ksnp_id.nid), peer_ni->ksnp_accepting);
1954 if (retry_later) /* needs reschedule */
1957 if ((wanted & BIT(SOCKLND_CONN_ANY)) != 0) {
1958 type = SOCKLND_CONN_ANY;
1959 } else if ((wanted & BIT(SOCKLND_CONN_CONTROL)) != 0) {
1960 type = SOCKLND_CONN_CONTROL;
1961 } else if ((wanted & BIT(SOCKLND_CONN_BULK_IN)) != 0) {
1962 type = SOCKLND_CONN_BULK_IN;
1964 LASSERT ((wanted & BIT(SOCKLND_CONN_BULK_OUT)) != 0);
1965 type = SOCKLND_CONN_BULK_OUT;
1968 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1970 if (ktime_get_seconds() >= deadline) {
1972 lnet_connect_console_error(rc, peer_ni->ksnp_id.nid,
1978 sock = lnet_connect(peer_ni->ksnp_id.nid,
1979 route->ksnr_myiface,
1980 route->ksnr_ipaddr, route->ksnr_port,
1981 peer_ni->ksnp_ni->ni_net_ns);
1987 rc = ksocknal_create_conn(peer_ni->ksnp_ni, route, sock, type);
1989 lnet_connect_console_error(rc, peer_ni->ksnp_id.nid,
1995 /* A +ve RC means I have to retry because I lost the connection
1996 * race or I have to renegotiate protocol version */
1997 retry_later = (rc != 0);
1999 CDEBUG(D_NET, "peer_ni %s: conn race, retry later.\n",
2000 libcfs_nid2str(peer_ni->ksnp_id.nid));
2002 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2005 route->ksnr_scheduled = 0;
2006 route->ksnr_connecting = 0;
2009 /* re-queue for attention; this frees me up to handle
2010 * the peer_ni's incoming connection request */
2012 if (rc == EALREADY ||
2013 (rc == 0 && peer_ni->ksnp_accepting > 0)) {
2014 /* We want to introduce a delay before next
2015 * attempt to connect if we lost conn race,
2016 * but the race is resolved quickly usually,
2017 * so min_reconnectms should be good heuristic */
2018 route->ksnr_retry_interval = *ksocknal_tunables.ksnd_min_reconnectms / 1000;
2019 route->ksnr_timeout = ktime_get_seconds() +
2020 route->ksnr_retry_interval;
2023 ksocknal_launch_connection_locked(route);
2026 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2030 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2032 route->ksnr_scheduled = 0;
2033 route->ksnr_connecting = 0;
2035 /* This is a retry rather than a new connection */
2036 route->ksnr_retry_interval *= 2;
2037 route->ksnr_retry_interval =
2038 max_t(time64_t, route->ksnr_retry_interval,
2039 *ksocknal_tunables.ksnd_min_reconnectms / 1000);
2040 route->ksnr_retry_interval =
2041 min_t(time64_t, route->ksnr_retry_interval,
2042 *ksocknal_tunables.ksnd_max_reconnectms / 1000);
2044 LASSERT(route->ksnr_retry_interval);
2045 route->ksnr_timeout = ktime_get_seconds() + route->ksnr_retry_interval;
2047 if (!list_empty(&peer_ni->ksnp_tx_queue) &&
2048 peer_ni->ksnp_accepting == 0 &&
2049 ksocknal_find_connecting_route_locked(peer_ni) == NULL) {
2050 struct ksock_conn *conn;
2052 /* ksnp_tx_queue is queued on a conn on successful
2053 * connection for V1.x and V2.x */
2054 if (!list_empty(&peer_ni->ksnp_conns)) {
2055 conn = list_entry(peer_ni->ksnp_conns.next,
2056 struct ksock_conn, ksnc_list);
2057 LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
2060 /* take all the blocked packets while I've got the lock and
2061 * complete below... */
2062 list_splice_init(&peer_ni->ksnp_tx_queue, &zombies);
2065 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2067 ksocknal_peer_failed(peer_ni);
2068 ksocknal_txlist_done(peer_ni->ksnp_ni, &zombies, rc);
2073 * check whether we need to create more connds.
2074 * It will try to create new thread if it's necessary, @timeout can
2075 * be updated if failed to create, so caller wouldn't keep try while
2076 * running out of resource.
2079 ksocknal_connd_check_start(time64_t sec, long *timeout)
2083 int total = ksocknal_data.ksnd_connd_starting +
2084 ksocknal_data.ksnd_connd_running;
2086 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2087 /* still in initializing */
2091 if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
2092 total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
2093 /* can't create more connd, or still have enough
2094 * threads to handle more connecting */
2098 if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
2099 /* no pending connecting request */
2103 if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
2104 /* may run out of resource, retry later */
2105 *timeout = cfs_time_seconds(1);
2109 if (ksocknal_data.ksnd_connd_starting > 0) {
2110 /* serialize starting to avoid flood */
2114 ksocknal_data.ksnd_connd_starting_stamp = sec;
2115 ksocknal_data.ksnd_connd_starting++;
2116 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2118 /* NB: total is the next id */
2119 snprintf(name, sizeof(name), "socknal_cd%02d", total);
2120 rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
2122 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2127 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2128 ksocknal_data.ksnd_connd_starting--;
2129 ksocknal_data.ksnd_connd_failed_stamp = ktime_get_real_seconds();
2135 * check whether current thread can exit, it will return 1 if there are too
2136 * many threads and no creating in past 120 seconds.
2137 * Also, this function may update @timeout to make caller come back
2138 * again to recheck these conditions.
2141 ksocknal_connd_check_stop(time64_t sec, long *timeout)
2145 if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
2146 /* still in initializing */
2150 if (ksocknal_data.ksnd_connd_starting > 0) {
2151 /* in progress of starting new thread */
2155 if (ksocknal_data.ksnd_connd_running <=
2156 *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
2160 /* created thread in past 120 seconds? */
2161 val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
2162 SOCKNAL_CONND_TIMEOUT - sec);
2164 *timeout = (val > 0) ? cfs_time_seconds(val) :
2165 cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
2169 /* no creating in past 120 seconds */
2171 return ksocknal_data.ksnd_connd_running >
2172 ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
2175 /* Go through connd_routes queue looking for a route that we can process
2176 * right now, @timeout_p can be updated if we need to come back later */
2177 static struct ksock_route *
2178 ksocknal_connd_get_route_locked(signed long *timeout_p)
2180 time64_t now = ktime_get_seconds();
2181 struct ksock_route *route;
2183 /* connd_routes can contain both pending and ordinary routes */
2184 list_for_each_entry(route, &ksocknal_data.ksnd_connd_routes,
2187 if (route->ksnr_retry_interval == 0 ||
2188 now >= route->ksnr_timeout)
2191 if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
2192 *timeout_p > cfs_time_seconds(route->ksnr_timeout - now))
2193 *timeout_p = cfs_time_seconds(route->ksnr_timeout - now);
2200 ksocknal_connd(void *arg)
2202 spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
2203 struct ksock_connreq *cr;
2204 wait_queue_entry_t wait;
2208 init_waitqueue_entry(&wait, current);
2210 spin_lock_bh(connd_lock);
2212 LASSERT(ksocknal_data.ksnd_connd_starting > 0);
2213 ksocknal_data.ksnd_connd_starting--;
2214 ksocknal_data.ksnd_connd_running++;
2216 while (!ksocknal_data.ksnd_shuttingdown) {
2217 struct ksock_route *route = NULL;
2218 time64_t sec = ktime_get_real_seconds();
2219 long timeout = MAX_SCHEDULE_TIMEOUT;
2220 int dropped_lock = 0;
2222 if (ksocknal_connd_check_stop(sec, &timeout)) {
2223 /* wakeup another one to check stop */
2224 wake_up(&ksocknal_data.ksnd_connd_waitq);
2228 if (ksocknal_connd_check_start(sec, &timeout)) {
2229 /* created new thread */
2233 if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2234 /* Connection accepted by the listener */
2235 cr = list_entry(ksocknal_data.ksnd_connd_connreqs.next,
2236 struct ksock_connreq, ksncr_list);
2238 list_del(&cr->ksncr_list);
2239 spin_unlock_bh(connd_lock);
2242 ksocknal_create_conn(cr->ksncr_ni, NULL,
2243 cr->ksncr_sock, SOCKLND_CONN_NONE);
2244 lnet_ni_decref(cr->ksncr_ni);
2245 LIBCFS_FREE(cr, sizeof(*cr));
2247 spin_lock_bh(connd_lock);
2250 /* Only handle an outgoing connection request if there
2251 * is a thread left to handle incoming connections and
2252 * create new connd */
2253 if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
2254 ksocknal_data.ksnd_connd_running) {
2255 route = ksocknal_connd_get_route_locked(&timeout);
2257 if (route != NULL) {
2258 list_del(&route->ksnr_connd_list);
2259 ksocknal_data.ksnd_connd_connecting++;
2260 spin_unlock_bh(connd_lock);
2263 if (ksocknal_connect(route)) {
2264 /* consecutive retry */
2265 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2266 CWARN("massive consecutive "
2267 "re-connecting to %pI4h\n",
2268 &route->ksnr_ipaddr);
2275 ksocknal_route_decref(route);
2277 spin_lock_bh(connd_lock);
2278 ksocknal_data.ksnd_connd_connecting--;
2282 if (++nloops < SOCKNAL_RESCHED)
2284 spin_unlock_bh(connd_lock);
2287 spin_lock_bh(connd_lock);
2291 /* Nothing to do for 'timeout' */
2292 set_current_state(TASK_INTERRUPTIBLE);
2293 add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
2294 spin_unlock_bh(connd_lock);
2297 schedule_timeout(timeout);
2299 remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
2300 spin_lock_bh(connd_lock);
2302 ksocknal_data.ksnd_connd_running--;
2303 spin_unlock_bh(connd_lock);
2305 ksocknal_thread_fini();
2309 static struct ksock_conn *
2310 ksocknal_find_timed_out_conn(struct ksock_peer_ni *peer_ni)
2312 /* We're called with a shared lock on ksnd_global_lock */
2313 struct ksock_conn *conn;
2314 struct list_head *ctmp;
2315 struct ksock_tx *tx;
2317 list_for_each(ctmp, &peer_ni->ksnp_conns) {
2320 conn = list_entry(ctmp, struct ksock_conn, ksnc_list);
2322 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2323 LASSERT (!conn->ksnc_closing);
2325 error = conn->ksnc_sock->sk->sk_err;
2327 ksocknal_conn_addref(conn);
2331 CNETERR("A connection with %s "
2332 "(%pI4h:%d) was reset; "
2333 "it may have rebooted.\n",
2334 libcfs_id2str(peer_ni->ksnp_id),
2339 CNETERR("A connection with %s "
2340 "(%pI4h:%d) timed out; the "
2341 "network or node may be down.\n",
2342 libcfs_id2str(peer_ni->ksnp_id),
2347 CNETERR("An unexpected network error %d "
2349 "(%pI4h:%d\n", error,
2350 libcfs_id2str(peer_ni->ksnp_id),
2359 if (conn->ksnc_rx_started &&
2360 ktime_get_seconds() >= conn->ksnc_rx_deadline) {
2361 /* Timed out incomplete incoming message */
2362 ksocknal_conn_addref(conn);
2363 CNETERR("Timeout receiving from %s (%pI4h:%d), "
2364 "state %d wanted %d left %d\n",
2365 libcfs_id2str(peer_ni->ksnp_id),
2368 conn->ksnc_rx_state,
2369 conn->ksnc_rx_nob_wanted,
2370 conn->ksnc_rx_nob_left);
2374 if ((!list_empty(&conn->ksnc_tx_queue) ||
2375 conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
2376 ktime_get_seconds() >= conn->ksnc_tx_deadline) {
2377 /* Timed out messages queued for sending or
2378 * buffered in the socket's send buffer */
2379 ksocknal_conn_addref(conn);
2380 list_for_each_entry(tx, &conn->ksnc_tx_queue,
2383 LNET_MSG_STATUS_LOCAL_TIMEOUT;
2384 CNETERR("Timeout sending data to %s (%pI4h:%d) "
2385 "the network or that node may be down.\n",
2386 libcfs_id2str(peer_ni->ksnp_id),
2387 &conn->ksnc_ipaddr, conn->ksnc_port);
2396 ksocknal_flush_stale_txs(struct ksock_peer_ni *peer_ni)
2398 struct ksock_tx *tx;
2399 LIST_HEAD(stale_txs);
2401 write_lock_bh(&ksocknal_data.ksnd_global_lock);
2403 while (!list_empty(&peer_ni->ksnp_tx_queue)) {
2404 tx = list_entry(peer_ni->ksnp_tx_queue.next,
2405 struct ksock_tx, tx_list);
2407 if (ktime_get_seconds() < tx->tx_deadline)
2410 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2412 list_move_tail(&tx->tx_list, &stale_txs);
2415 write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2417 ksocknal_txlist_done(peer_ni->ksnp_ni, &stale_txs, -ETIMEDOUT);
2421 ksocknal_send_keepalive_locked(struct ksock_peer_ni *peer_ni)
2422 __must_hold(&ksocknal_data.ksnd_global_lock)
2424 struct ksock_sched *sched;
2425 struct ksock_conn *conn;
2426 struct ksock_tx *tx;
2428 /* last_alive will be updated by create_conn */
2429 if (list_empty(&peer_ni->ksnp_conns))
2432 if (peer_ni->ksnp_proto != &ksocknal_protocol_v3x)
2435 if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2436 ktime_get_seconds() < peer_ni->ksnp_last_alive +
2437 *ksocknal_tunables.ksnd_keepalive)
2440 if (ktime_get_seconds() < peer_ni->ksnp_send_keepalive)
2443 /* retry 10 secs later, so we wouldn't put pressure
2444 * on this peer_ni if we failed to send keepalive this time */
2445 peer_ni->ksnp_send_keepalive = ktime_get_seconds() + 10;
2447 conn = ksocknal_find_conn_locked(peer_ni, NULL, 1);
2449 sched = conn->ksnc_scheduler;
2451 spin_lock_bh(&sched->kss_lock);
2452 if (!list_empty(&conn->ksnc_tx_queue)) {
2453 spin_unlock_bh(&sched->kss_lock);
2454 /* there is an queued ACK, don't need keepalive */
2458 spin_unlock_bh(&sched->kss_lock);
2461 read_unlock(&ksocknal_data.ksnd_global_lock);
2463 /* cookie = 1 is reserved for keepalive PING */
2464 tx = ksocknal_alloc_tx_noop(1, 1);
2466 read_lock(&ksocknal_data.ksnd_global_lock);
2470 if (ksocknal_launch_packet(peer_ni->ksnp_ni, tx, peer_ni->ksnp_id) == 0) {
2471 read_lock(&ksocknal_data.ksnd_global_lock);
2475 ksocknal_free_tx(tx);
2476 read_lock(&ksocknal_data.ksnd_global_lock);
2483 ksocknal_check_peer_timeouts(int idx)
2485 struct hlist_head *peers = &ksocknal_data.ksnd_peers[idx];
2486 struct ksock_peer_ni *peer_ni;
2487 struct ksock_conn *conn;
2488 struct ksock_tx *tx;
2491 /* NB. We expect to have a look at all the peers and not find any
2492 * connections to time out, so we just use a shared lock while we
2495 read_lock(&ksocknal_data.ksnd_global_lock);
2497 hlist_for_each_entry(peer_ni, peers, ksnp_list) {
2498 struct ksock_tx *tx_stale;
2499 time64_t deadline = 0;
2503 if (ksocknal_send_keepalive_locked(peer_ni) != 0) {
2504 read_unlock(&ksocknal_data.ksnd_global_lock);
2508 conn = ksocknal_find_timed_out_conn(peer_ni);
2511 read_unlock(&ksocknal_data.ksnd_global_lock);
2513 ksocknal_close_conn_and_siblings(conn, -ETIMEDOUT);
2515 /* NB we won't find this one again, but we can't
2516 * just proceed with the next peer_ni, since we dropped
2517 * ksnd_global_lock and it might be dead already!
2519 ksocknal_conn_decref(conn);
2523 /* we can't process stale txs right here because we're
2524 * holding only shared lock
2526 if (!list_empty(&peer_ni->ksnp_tx_queue)) {
2527 struct ksock_tx *tx;
2529 tx = list_entry(peer_ni->ksnp_tx_queue.next,
2530 struct ksock_tx, tx_list);
2531 if (ktime_get_seconds() >= tx->tx_deadline) {
2532 ksocknal_peer_addref(peer_ni);
2533 read_unlock(&ksocknal_data.ksnd_global_lock);
2535 ksocknal_flush_stale_txs(peer_ni);
2537 ksocknal_peer_decref(peer_ni);
2542 if (list_empty(&peer_ni->ksnp_zc_req_list))
2546 spin_lock(&peer_ni->ksnp_lock);
2547 list_for_each_entry(tx, &peer_ni->ksnp_zc_req_list, tx_zc_list) {
2548 if (ktime_get_seconds() < tx->tx_deadline)
2550 /* ignore the TX if connection is being closed */
2551 if (tx->tx_conn->ksnc_closing)
2554 if (tx_stale == NULL)
2558 if (tx_stale == NULL) {
2559 spin_unlock(&peer_ni->ksnp_lock);
2563 deadline = tx_stale->tx_deadline;
2564 resid = tx_stale->tx_resid;
2565 conn = tx_stale->tx_conn;
2566 ksocknal_conn_addref(conn);
2568 spin_unlock(&peer_ni->ksnp_lock);
2569 read_unlock(&ksocknal_data.ksnd_global_lock);
2571 CERROR("Total %d stale ZC_REQs for peer_ni %s detected; the "
2572 "oldest(%p) timed out %lld secs ago, "
2573 "resid: %d, wmem: %d\n",
2574 n, libcfs_nid2str(peer_ni->ksnp_id.nid), tx_stale,
2575 ktime_get_seconds() - deadline,
2576 resid, conn->ksnc_sock->sk->sk_wmem_queued);
2578 ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2579 ksocknal_conn_decref(conn);
2583 read_unlock(&ksocknal_data.ksnd_global_lock);
2586 int ksocknal_reaper(void *arg)
2588 wait_queue_entry_t wait;
2589 struct ksock_conn *conn;
2590 struct ksock_sched *sched;
2591 LIST_HEAD(enomem_conns);
2596 time64_t deadline = ktime_get_seconds();
2598 init_waitqueue_entry(&wait, current);
2600 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2602 while (!ksocknal_data.ksnd_shuttingdown) {
2603 if (!list_empty(&ksocknal_data.ksnd_deathrow_conns)) {
2604 conn = list_entry(ksocknal_data.ksnd_deathrow_conns.next,
2605 struct ksock_conn, ksnc_list);
2606 list_del(&conn->ksnc_list);
2608 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2610 ksocknal_terminate_conn(conn);
2611 ksocknal_conn_decref(conn);
2613 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2617 if (!list_empty(&ksocknal_data.ksnd_zombie_conns)) {
2618 conn = list_entry(ksocknal_data.ksnd_zombie_conns.next,
2619 struct ksock_conn, ksnc_list);
2620 list_del(&conn->ksnc_list);
2622 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2624 ksocknal_destroy_conn(conn);
2626 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2630 list_splice_init(&ksocknal_data.ksnd_enomem_conns,
2633 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2635 /* reschedule all the connections that stalled with ENOMEM... */
2637 while (!list_empty(&enomem_conns)) {
2638 conn = list_entry(enomem_conns.next,
2639 struct ksock_conn, ksnc_tx_list);
2640 list_del(&conn->ksnc_tx_list);
2642 sched = conn->ksnc_scheduler;
2644 spin_lock_bh(&sched->kss_lock);
2646 LASSERT(conn->ksnc_tx_scheduled);
2647 conn->ksnc_tx_ready = 1;
2648 list_add_tail(&conn->ksnc_tx_list,
2649 &sched->kss_tx_conns);
2650 wake_up(&sched->kss_waitq);
2652 spin_unlock_bh(&sched->kss_lock);
2656 /* careful with the jiffy wrap... */
2657 while ((timeout = deadline - ktime_get_seconds()) <= 0) {
2660 int chunk = HASH_SIZE(ksocknal_data.ksnd_peers);
2661 unsigned int lnd_timeout;
2663 /* Time to check for timeouts on a few more peers: I
2664 * do checks every 'p' seconds on a proportion of the
2665 * peer_ni table and I need to check every connection
2666 * 'n' times within a timeout interval, to ensure I
2667 * detect a timeout on any connection within (n+1)/n
2668 * times the timeout interval.
2671 lnd_timeout = lnet_get_lnd_timeout();
2672 if (lnd_timeout > n * p)
2673 chunk = (chunk * n * p) / lnd_timeout;
2677 for (i = 0; i < chunk; i++) {
2678 ksocknal_check_peer_timeouts(peer_index);
2679 peer_index = (peer_index + 1) %
2680 HASH_SIZE(ksocknal_data.ksnd_peers);
2686 if (nenomem_conns != 0) {
2687 /* Reduce my timeout if I rescheduled ENOMEM conns.
2688 * This also prevents me getting woken immediately
2689 * if any go back on my enomem list. */
2690 timeout = SOCKNAL_ENOMEM_RETRY;
2692 ksocknal_data.ksnd_reaper_waketime = ktime_get_seconds() +
2695 set_current_state(TASK_INTERRUPTIBLE);
2696 add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2698 if (!ksocknal_data.ksnd_shuttingdown &&
2699 list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
2700 list_empty(&ksocknal_data.ksnd_zombie_conns))
2701 schedule_timeout(cfs_time_seconds(timeout));
2703 set_current_state(TASK_RUNNING);
2704 remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
2706 spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
2709 spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
2711 ksocknal_thread_fini();