1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
39 # if defined(CONFIG_SYSCTL) && !CFS_SYSFS_MODULE_PARM
40 static cfs_sysctl_table_t ksocknal_ctl_table[23];
42 cfs_sysctl_table_t ksocknal_top_ctl_table[] = {
45 .procname = "socknal",
49 .child = ksocknal_ctl_table
55 ksocknal_lib_tunables_init ()
60 if (*ksocknal_tunables.ksnd_zc_recv_min_nfrags < 2)
61 *ksocknal_tunables.ksnd_zc_recv_min_nfrags = 2;
63 if (*ksocknal_tunables.ksnd_zc_recv_min_nfrags > LNET_MAX_IOV)
64 *ksocknal_tunables.ksnd_zc_recv_min_nfrags = LNET_MAX_IOV;
66 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
68 .procname = "timeout",
69 .data = ksocknal_tunables.ksnd_timeout,
70 .maxlen = sizeof (int),
72 .proc_handler = &proc_dointvec
74 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
76 .procname = "credits",
77 .data = ksocknal_tunables.ksnd_credits,
78 .maxlen = sizeof (int),
80 .proc_handler = &proc_dointvec
82 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
84 .procname = "peer_credits",
85 .data = ksocknal_tunables.ksnd_peercredits,
86 .maxlen = sizeof (int),
88 .proc_handler = &proc_dointvec
90 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
92 .procname = "nconnds",
93 .data = ksocknal_tunables.ksnd_nconnds,
94 .maxlen = sizeof (int),
96 .proc_handler = &proc_dointvec
98 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
100 .procname = "min_reconnectms",
101 .data = ksocknal_tunables.ksnd_min_reconnectms,
102 .maxlen = sizeof (int),
104 .proc_handler = &proc_dointvec
106 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
108 .procname = "max_reconnectms",
109 .data = ksocknal_tunables.ksnd_max_reconnectms,
110 .maxlen = sizeof (int),
112 .proc_handler = &proc_dointvec
114 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
116 .procname = "eager_ack",
117 .data = ksocknal_tunables.ksnd_eager_ack,
118 .maxlen = sizeof (int),
120 .proc_handler = &proc_dointvec
122 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
124 .procname = "zero_copy",
125 .data = ksocknal_tunables.ksnd_zc_min_frag,
126 .maxlen = sizeof (int),
128 .proc_handler = &proc_dointvec
130 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
132 .procname = "zero_copy_recv",
133 .data = ksocknal_tunables.ksnd_zc_recv,
134 .maxlen = sizeof (int),
136 .proc_handler = &proc_dointvec
138 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
140 .procname = "zero_copy_recv_min_nfrags",
141 .data = ksocknal_tunables.ksnd_zc_recv_min_nfrags,
142 .maxlen = sizeof (int),
144 .proc_handler = &proc_dointvec
146 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
149 .data = ksocknal_tunables.ksnd_typed_conns,
150 .maxlen = sizeof (int),
152 .proc_handler = &proc_dointvec
154 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
156 .procname = "min_bulk",
157 .data = ksocknal_tunables.ksnd_min_bulk,
158 .maxlen = sizeof (int),
160 .proc_handler = &proc_dointvec
162 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
164 .procname = "rx_buffer_size",
165 .data = ksocknal_tunables.ksnd_rx_buffer_size,
166 .maxlen = sizeof(int),
168 .proc_handler = &proc_dointvec
170 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
172 .procname = "tx_buffer_size",
173 .data = ksocknal_tunables.ksnd_tx_buffer_size,
174 .maxlen = sizeof(int),
176 .proc_handler = &proc_dointvec
178 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
181 .data = ksocknal_tunables.ksnd_nagle,
182 .maxlen = sizeof(int),
184 .proc_handler = &proc_dointvec
187 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
189 .procname = "irq_affinity",
190 .data = ksocknal_tunables.ksnd_irq_affinity,
191 .maxlen = sizeof(int),
193 .proc_handler = &proc_dointvec
196 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
198 .procname = "keepalive_idle",
199 .data = ksocknal_tunables.ksnd_keepalive_idle,
200 .maxlen = sizeof(int),
202 .proc_handler = &proc_dointvec
204 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
206 .procname = "keepalive_count",
207 .data = ksocknal_tunables.ksnd_keepalive_count,
208 .maxlen = sizeof(int),
210 .proc_handler = &proc_dointvec
212 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
214 .procname = "keepalive_intvl",
215 .data = ksocknal_tunables.ksnd_keepalive_intvl,
216 .maxlen = sizeof(int),
218 .proc_handler = &proc_dointvec
220 #ifdef SOCKNAL_BACKOFF
221 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
223 .procname = "backoff_init",
224 .data = ksocknal_tunables.ksnd_backoff_init,
225 .maxlen = sizeof(int),
227 .proc_handler = &proc_dointvec
229 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
231 .procname = "backoff_max",
232 .data = ksocknal_tunables.ksnd_backoff_max,
233 .maxlen = sizeof(int),
235 .proc_handler = &proc_dointvec
238 #if SOCKNAL_VERSION_DEBUG
239 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) {
241 .procname = "protocol",
242 .data = ksocknal_tunables.ksnd_protocol,
243 .maxlen = sizeof(int),
245 .proc_handler = &proc_dointvec
248 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t) { 0 };
251 LASSERT (i <= sizeof(ksocknal_ctl_table)/sizeof(ksocknal_ctl_table[0]));
253 ksocknal_tunables.ksnd_sysctl =
254 cfs_register_sysctl_table(ksocknal_top_ctl_table, 0);
256 if (ksocknal_tunables.ksnd_sysctl == NULL)
257 CWARN("Can't setup /proc tunables\n");
263 ksocknal_lib_tunables_fini ()
265 if (ksocknal_tunables.ksnd_sysctl != NULL)
266 cfs_unregister_sysctl_table(ksocknal_tunables.ksnd_sysctl);
270 ksocknal_lib_tunables_init ()
276 ksocknal_lib_tunables_fini ()
279 #endif /* # if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM */
282 ksocknal_lib_bind_irq (unsigned int irq)
284 #if (defined(CONFIG_SMP) && defined(CPU_AFFINITY))
288 ksock_irqinfo_t *info;
289 char *argv[] = {"/bin/sh",
293 char *envp[] = {"HOME=/",
294 "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
297 LASSERT (irq < NR_IRQS);
298 if (irq == 0) /* software NIC or affinity disabled */
301 info = &ksocknal_data.ksnd_irqinfo[irq];
303 write_lock_bh (&ksocknal_data.ksnd_global_lock);
305 LASSERT (info->ksni_valid);
306 bind = !info->ksni_bound;
307 info->ksni_bound = 1;
309 write_unlock_bh (&ksocknal_data.ksnd_global_lock);
311 if (!bind) /* bound already */
314 cpu = ksocknal_irqsched2cpu(info->ksni_sched);
315 snprintf (cmdline, sizeof (cmdline),
316 "echo %d > /proc/irq/%u/smp_affinity", 1 << cpu, irq);
318 LCONSOLE_INFO("Binding irq %u to CPU %d with cmd: %s\n",
321 /* FIXME: Find a better method of setting IRQ affinity...
324 USERMODEHELPER(argv[0], argv, envp);
329 ksocknal_lib_get_conn_addrs (ksock_conn_t *conn)
331 int rc = libcfs_sock_getaddr(conn->ksnc_sock, 1,
335 /* Didn't need the {get,put}connsock dance to deref ksnc_sock... */
336 LASSERT (!conn->ksnc_closing);
339 CERROR ("Error %d getting sock peer IP\n", rc);
343 rc = libcfs_sock_getaddr(conn->ksnc_sock, 0,
344 &conn->ksnc_myipaddr, NULL);
346 CERROR ("Error %d getting sock local IP\n", rc);
354 ksocknal_lib_sock_irq (struct socket *sock)
358 struct dst_entry *dst;
360 if (!*ksocknal_tunables.ksnd_irq_affinity)
363 dst = sk_dst_get (sock->sk);
365 if (dst->dev != NULL) {
367 if (irq >= NR_IRQS) {
368 CERROR ("Unexpected IRQ %x\n", irq);
380 ksocknal_lib_zc_capable(struct socket *sock)
382 int caps = sock->sk->sk_route_caps;
384 /* ZC if the socket supports scatter/gather and doesn't need software
386 return ((caps & NETIF_F_SG) != 0 &&
387 (caps & (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)) != 0);
391 ksocknal_lib_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
393 struct socket *sock = conn->ksnc_sock;
397 if (*ksocknal_tunables.ksnd_enable_csum && /* checksum enabled */
398 conn->ksnc_proto == &ksocknal_protocol_v2x && /* V2.x connection */
399 tx->tx_nob == tx->tx_resid && /* frist sending */
400 tx->tx_msg.ksm_csum == 0) /* not checksummed */
401 ksocknal_lib_csum_tx(tx);
403 /* NB we can't trust socket ops to either consume our iovs
404 * or leave them alone. */
407 #if SOCKNAL_SINGLE_FRAG_TX
408 struct iovec scratch;
409 struct iovec *scratchiov = &scratch;
410 unsigned int niov = 1;
412 struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
413 unsigned int niov = tx->tx_niov;
415 struct msghdr msg = {
418 .msg_iov = scratchiov,
422 .msg_flags = MSG_DONTWAIT
424 mm_segment_t oldmm = get_fs();
427 for (nob = i = 0; i < niov; i++) {
428 scratchiov[i] = tx->tx_iov[i];
429 nob += scratchiov[i].iov_len;
432 if (!list_empty(&conn->ksnc_tx_queue) ||
434 msg.msg_flags |= MSG_MORE;
437 rc = sock_sendmsg(sock, &msg, nob);
444 ksocknal_lib_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
446 struct socket *sock = conn->ksnc_sock;
447 lnet_kiov_t *kiov = tx->tx_kiov;
451 /* NB we can't trust socket ops to either consume our iovs
452 * or leave them alone. */
454 if (kiov->kiov_len >= *ksocknal_tunables.ksnd_zc_min_frag &&
455 tx->tx_msg.ksm_zc_req_cookie != 0) {
456 /* Zero copy is enabled */
457 struct sock *sk = sock->sk;
458 struct page *page = kiov->kiov_page;
459 int offset = kiov->kiov_offset;
460 int fragsize = kiov->kiov_len;
461 int msgflg = MSG_DONTWAIT;
463 CDEBUG(D_NET, "page %p + offset %x for %d\n",
464 page, offset, kiov->kiov_len);
466 if (!list_empty(&conn->ksnc_tx_queue) ||
467 fragsize < tx->tx_resid)
470 if (sk->sk_prot->sendpage != NULL) {
471 rc = sk->sk_prot->sendpage(sk, page,
472 offset, fragsize, msgflg);
474 rc = tcp_sendpage(sock, page, offset, fragsize, msgflg);
477 #if SOCKNAL_SINGLE_FRAG_TX || !SOCKNAL_RISK_KMAP_DEADLOCK
478 struct iovec scratch;
479 struct iovec *scratchiov = &scratch;
480 unsigned int niov = 1;
482 #ifdef CONFIG_HIGHMEM
483 #warning "XXX risk of kmap deadlock on multiple frags..."
485 struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
486 unsigned int niov = tx->tx_nkiov;
488 struct msghdr msg = {
491 .msg_iov = scratchiov,
495 .msg_flags = MSG_DONTWAIT
497 mm_segment_t oldmm = get_fs();
500 for (nob = i = 0; i < niov; i++) {
501 scratchiov[i].iov_base = kmap(kiov[i].kiov_page) +
503 nob += scratchiov[i].iov_len = kiov[i].kiov_len;
506 if (!list_empty(&conn->ksnc_tx_queue) ||
508 msg.msg_flags |= MSG_MORE;
511 rc = sock_sendmsg(sock, &msg, nob);
514 for (i = 0; i < niov; i++)
515 kunmap(kiov[i].kiov_page);
521 ksocknal_lib_eager_ack (ksock_conn_t *conn)
524 mm_segment_t oldmm = get_fs();
525 struct socket *sock = conn->ksnc_sock;
527 /* Remind the socket to ACK eagerly. If I don't, the socket might
528 * think I'm about to send something it could piggy-back the ACK
529 * on, introducing delay in completing zero-copy sends in my
533 sock->ops->setsockopt (sock, SOL_TCP, TCP_QUICKACK,
534 (char *)&opt, sizeof (opt));
539 ksocknal_lib_recv_iov (ksock_conn_t *conn)
541 #if SOCKNAL_SINGLE_FRAG_RX
542 struct iovec scratch;
543 struct iovec *scratchiov = &scratch;
544 unsigned int niov = 1;
546 struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
547 unsigned int niov = conn->ksnc_rx_niov;
549 struct iovec *iov = conn->ksnc_rx_iov;
550 struct msghdr msg = {
553 .msg_iov = scratchiov,
559 mm_segment_t oldmm = get_fs();
567 /* NB we can't trust socket ops to either consume our iovs
568 * or leave them alone. */
571 for (nob = i = 0; i < niov; i++) {
572 scratchiov[i] = iov[i];
573 nob += scratchiov[i].iov_len;
575 LASSERT (nob <= conn->ksnc_rx_nob_wanted);
578 rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
579 /* NB this is just a boolean..........................^ */
583 if (conn->ksnc_proto == &ksocknal_protocol_v2x) {
584 saved_csum = conn->ksnc_msg.ksm_csum;
585 conn->ksnc_msg.ksm_csum = 0;
588 if (saved_csum != 0) {
589 /* accumulate checksum */
590 for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {
593 fragnob = iov[i].iov_len;
597 conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum,
598 iov[i].iov_base, fragnob);
600 conn->ksnc_msg.ksm_csum = saved_csum;
607 ksocknal_lib_kiov_vunmap(void *addr)
616 ksocknal_lib_kiov_vmap(lnet_kiov_t *kiov, int niov,
617 struct iovec *iov, struct page **pages)
623 if (!*ksocknal_tunables.ksnd_zc_recv || pages == NULL)
626 LASSERT (niov <= LNET_MAX_IOV);
629 niov < *ksocknal_tunables.ksnd_zc_recv_min_nfrags)
632 for (nob = i = 0; i < niov; i++) {
633 if ((kiov[i].kiov_offset != 0 && i > 0) ||
634 (kiov[i].kiov_offset + kiov[i].kiov_len != CFS_PAGE_SIZE && i < niov - 1))
637 pages[i] = kiov[i].kiov_page;
638 nob += kiov[i].kiov_len;
641 addr = vmap(pages, niov, VM_MAP, PAGE_KERNEL);
645 iov->iov_base = addr + kiov[0].kiov_offset;
652 ksocknal_lib_recv_kiov (ksock_conn_t *conn)
654 #if SOCKNAL_SINGLE_FRAG_RX || !SOCKNAL_RISK_KMAP_DEADLOCK
655 struct iovec scratch;
656 struct iovec *scratchiov = &scratch;
657 struct page **pages = NULL;
658 unsigned int niov = 1;
660 #ifdef CONFIG_HIGHMEM
661 #warning "XXX risk of kmap deadlock on multiple frags..."
663 struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
664 struct page **pages = conn->ksnc_scheduler->kss_rx_scratch_pgs;
665 unsigned int niov = conn->ksnc_rx_nkiov;
667 lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
668 struct msghdr msg = {
671 .msg_iov = scratchiov,
676 mm_segment_t oldmm = get_fs();
685 /* NB we can't trust socket ops to either consume our iovs
686 * or leave them alone. */
687 if ((addr = ksocknal_lib_kiov_vmap(kiov, niov, scratchiov, pages)) != NULL) {
688 nob = scratchiov[0].iov_len;
692 for (nob = i = 0; i < niov; i++) {
693 nob += scratchiov[i].iov_len = kiov[i].kiov_len;
694 scratchiov[i].iov_base = kmap(kiov[i].kiov_page) +
697 msg.msg_iovlen = niov;
701 LASSERT (nob <= conn->ksnc_rx_nob_wanted);
704 rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
705 /* NB this is just a boolean.......................^ */
708 if (conn->ksnc_msg.ksm_csum != 0) {
709 for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {
712 /* Dang! have to kmap again because I have nowhere to stash the
713 * mapped address. But by doing it while the page is still
714 * mapped, the kernel just bumps the map count and returns me
715 * the address it stashed. */
716 base = kmap(kiov[i].kiov_page) + kiov[i].kiov_offset;
717 fragnob = kiov[i].kiov_len;
721 conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum,
724 kunmap(kiov[i].kiov_page);
729 ksocknal_lib_kiov_vunmap(addr);
731 for (i = 0; i < niov; i++)
732 kunmap(kiov[i].kiov_page);
739 ksocknal_lib_csum_tx(ksock_tx_t *tx)
745 LASSERT(tx->tx_iov[0].iov_base == (void *)&tx->tx_msg);
746 LASSERT(tx->tx_conn != NULL);
747 LASSERT(tx->tx_conn->ksnc_proto == &ksocknal_protocol_v2x);
749 tx->tx_msg.ksm_csum = 0;
751 csum = ksocknal_csum(~0, (void *)tx->tx_iov[0].iov_base,
752 tx->tx_iov[0].iov_len);
754 if (tx->tx_kiov != NULL) {
755 for (i = 0; i < tx->tx_nkiov; i++) {
756 base = kmap(tx->tx_kiov[i].kiov_page) +
757 tx->tx_kiov[i].kiov_offset;
759 csum = ksocknal_csum(csum, base, tx->tx_kiov[i].kiov_len);
761 kunmap(tx->tx_kiov[i].kiov_page);
764 for (i = 1; i < tx->tx_niov; i++)
765 csum = ksocknal_csum(csum, tx->tx_iov[i].iov_base,
766 tx->tx_iov[i].iov_len);
769 if (*ksocknal_tunables.ksnd_inject_csum_error) {
771 *ksocknal_tunables.ksnd_inject_csum_error = 0;
774 tx->tx_msg.ksm_csum = csum;
778 ksocknal_lib_get_conn_tunables (ksock_conn_t *conn, int *txmem, int *rxmem, int *nagle)
780 mm_segment_t oldmm = get_fs ();
781 struct socket *sock = conn->ksnc_sock;
785 rc = ksocknal_connsock_addref(conn);
787 LASSERT (conn->ksnc_closing);
788 *txmem = *rxmem = *nagle = 0;
792 rc = libcfs_sock_getbuf(sock, txmem, rxmem);
794 len = sizeof(*nagle);
796 rc = sock->ops->getsockopt(sock, SOL_TCP, TCP_NODELAY,
797 (char *)nagle, &len);
801 ksocknal_connsock_decref(conn);
806 *txmem = *rxmem = *nagle = 0;
812 ksocknal_lib_setup_sock (struct socket *sock)
814 mm_segment_t oldmm = get_fs ();
821 struct linger linger;
823 sock->sk->sk_allocation = GFP_NOFS;
825 /* Ensure this socket aborts active sends immediately when we close
832 rc = sock_setsockopt (sock, SOL_SOCKET, SO_LINGER,
833 (char *)&linger, sizeof (linger));
836 CERROR ("Can't set SO_LINGER: %d\n", rc);
842 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_LINGER2,
843 (char *)&option, sizeof (option));
846 CERROR ("Can't set SO_LINGER2: %d\n", rc);
850 if (!*ksocknal_tunables.ksnd_nagle) {
854 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_NODELAY,
855 (char *)&option, sizeof (option));
858 CERROR ("Can't disable nagle: %d\n", rc);
863 rc = libcfs_sock_setbuf(sock,
864 *ksocknal_tunables.ksnd_tx_buffer_size,
865 *ksocknal_tunables.ksnd_rx_buffer_size);
867 CERROR ("Can't set buffer tx %d, rx %d buffers: %d\n",
868 *ksocknal_tunables.ksnd_tx_buffer_size,
869 *ksocknal_tunables.ksnd_rx_buffer_size, rc);
873 /* TCP_BACKOFF_* sockopt tunables unsupported in stock kernels */
874 #ifdef SOCKNAL_BACKOFF
875 if (*ksocknal_tunables.ksnd_backoff_init > 0) {
876 option = *ksocknal_tunables.ksnd_backoff_init;
877 #ifdef SOCKNAL_BACKOFF_MS
882 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_BACKOFF_INIT,
883 (char *)&option, sizeof (option));
886 CERROR ("Can't set initial tcp backoff %d: %d\n",
892 if (*ksocknal_tunables.ksnd_backoff_max > 0) {
893 option = *ksocknal_tunables.ksnd_backoff_max;
894 #ifdef SOCKNAL_BACKOFF_MS
899 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_BACKOFF_MAX,
900 (char *)&option, sizeof (option));
903 CERROR ("Can't set maximum tcp backoff %d: %d\n",
910 /* snapshot tunables */
911 keep_idle = *ksocknal_tunables.ksnd_keepalive_idle;
912 keep_count = *ksocknal_tunables.ksnd_keepalive_count;
913 keep_intvl = *ksocknal_tunables.ksnd_keepalive_intvl;
915 do_keepalive = (keep_idle > 0 && keep_count > 0 && keep_intvl > 0);
917 option = (do_keepalive ? 1 : 0);
919 rc = sock_setsockopt (sock, SOL_SOCKET, SO_KEEPALIVE,
920 (char *)&option, sizeof (option));
923 CERROR ("Can't set SO_KEEPALIVE: %d\n", rc);
931 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPIDLE,
932 (char *)&keep_idle, sizeof (keep_idle));
935 CERROR ("Can't set TCP_KEEPIDLE: %d\n", rc);
940 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPINTVL,
941 (char *)&keep_intvl, sizeof (keep_intvl));
944 CERROR ("Can't set TCP_KEEPINTVL: %d\n", rc);
949 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPCNT,
950 (char *)&keep_count, sizeof (keep_count));
953 CERROR ("Can't set TCP_KEEPCNT: %d\n", rc);
960 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
961 struct tcp_opt *sock2tcp_opt(struct sock *sk)
963 return &(sk->tp_pinfo.af_tcp);
965 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
966 #define sock2tcp_opt(sk) tcp_sk(sk)
968 struct tcp_opt *sock2tcp_opt(struct sock *sk)
970 struct tcp_sock *s = (struct tcp_sock *)sk;
976 ksocknal_lib_push_conn (ksock_conn_t *conn)
979 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,11))
989 rc = ksocknal_connsock_addref(conn);
990 if (rc != 0) /* being shut down */
993 sk = conn->ksnc_sock->sk;
994 tp = sock2tcp_opt(sk);
997 nonagle = tp->nonagle;
1004 rc = sk->sk_prot->setsockopt (sk, SOL_TCP, TCP_NODELAY,
1005 (char *)&val, sizeof (val));
1011 tp->nonagle = nonagle;
1014 ksocknal_connsock_decref(conn);
1017 extern void ksocknal_read_callback (ksock_conn_t *conn);
1018 extern void ksocknal_write_callback (ksock_conn_t *conn);
1020 * socket call back in Linux
1023 ksocknal_data_ready (struct sock *sk, int n)
1028 /* interleave correctly with closing sockets... */
1030 read_lock (&ksocknal_data.ksnd_global_lock);
1032 conn = sk->sk_user_data;
1033 if (conn == NULL) { /* raced with ksocknal_terminate_conn */
1034 LASSERT (sk->sk_data_ready != &ksocknal_data_ready);
1035 sk->sk_data_ready (sk, n);
1037 ksocknal_read_callback(conn);
1039 read_unlock (&ksocknal_data.ksnd_global_lock);
1045 ksocknal_write_space (struct sock *sk)
1051 /* interleave correctly with closing sockets... */
1053 read_lock (&ksocknal_data.ksnd_global_lock);
1055 conn = sk->sk_user_data;
1056 wspace = SOCKNAL_WSPACE(sk);
1057 min_wpace = SOCKNAL_MIN_WSPACE(sk);
1059 CDEBUG(D_NET, "sk %p wspace %d low water %d conn %p%s%s%s\n",
1060 sk, wspace, min_wpace, conn,
1061 (conn == NULL) ? "" : (conn->ksnc_tx_ready ?
1062 " ready" : " blocked"),
1063 (conn == NULL) ? "" : (conn->ksnc_tx_scheduled ?
1064 " scheduled" : " idle"),
1065 (conn == NULL) ? "" : (list_empty (&conn->ksnc_tx_queue) ?
1066 " empty" : " queued"));
1068 if (conn == NULL) { /* raced with ksocknal_terminate_conn */
1069 LASSERT (sk->sk_write_space != &ksocknal_write_space);
1070 sk->sk_write_space (sk);
1072 read_unlock (&ksocknal_data.ksnd_global_lock);
1076 if (wspace >= min_wpace) { /* got enough space */
1077 ksocknal_write_callback(conn);
1079 /* Clear SOCK_NOSPACE _after_ ksocknal_write_callback so the
1080 * ENOMEM check in ksocknal_transmit is race-free (think about
1083 clear_bit (SOCK_NOSPACE, &sk->sk_socket->flags);
1086 read_unlock (&ksocknal_data.ksnd_global_lock);
1090 ksocknal_lib_save_callback(struct socket *sock, ksock_conn_t *conn)
1092 conn->ksnc_saved_data_ready = sock->sk->sk_data_ready;
1093 conn->ksnc_saved_write_space = sock->sk->sk_write_space;
1097 ksocknal_lib_set_callback(struct socket *sock, ksock_conn_t *conn)
1099 sock->sk->sk_user_data = conn;
1100 sock->sk->sk_data_ready = ksocknal_data_ready;
1101 sock->sk->sk_write_space = ksocknal_write_space;
1106 ksocknal_lib_reset_callback(struct socket *sock, ksock_conn_t *conn)
1108 /* Remove conn's network callbacks.
1109 * NB I _have_ to restore the callback, rather than storing a noop,
1110 * since the socket could survive past this module being unloaded!! */
1111 sock->sk->sk_data_ready = conn->ksnc_saved_data_ready;
1112 sock->sk->sk_write_space = conn->ksnc_saved_write_space;
1114 /* A callback could be in progress already; they hold a read lock
1115 * on ksnd_global_lock (to serialise with me) and NOOP if
1116 * sk_user_data is NULL. */
1117 sock->sk->sk_user_data = NULL;