1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
7 # if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
8 static cfs_sysctl_table_t ksocknal_ctl_table[21];
10 cfs_sysctl_table_t ksocknal_top_ctl_table[] = {
13 .procname = "socknal",
17 .child = ksocknal_ctl_table
23 ksocknal_lib_tunables_init ()
28 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
31 .procname = "timeout",
32 .data = ksocknal_tunables.ksnd_timeout,
33 .maxlen = sizeof (int),
35 .proc_handler = &proc_dointvec
37 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
40 .procname = "credits",
41 .data = ksocknal_tunables.ksnd_credits,
42 .maxlen = sizeof (int),
44 .proc_handler = &proc_dointvec
46 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
49 .procname = "peer_credits",
50 .data = ksocknal_tunables.ksnd_peercredits,
51 .maxlen = sizeof (int),
53 .proc_handler = &proc_dointvec
55 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
58 .procname = "nconnds",
59 .data = ksocknal_tunables.ksnd_nconnds,
60 .maxlen = sizeof (int),
62 .proc_handler = &proc_dointvec
64 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
67 .procname = "min_reconnectms",
68 .data = ksocknal_tunables.ksnd_min_reconnectms,
69 .maxlen = sizeof (int),
71 .proc_handler = &proc_dointvec
73 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
76 .procname = "max_reconnectms",
77 .data = ksocknal_tunables.ksnd_max_reconnectms,
78 .maxlen = sizeof (int),
80 .proc_handler = &proc_dointvec
82 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
85 .procname = "eager_ack",
86 .data = ksocknal_tunables.ksnd_eager_ack,
87 .maxlen = sizeof (int),
89 .proc_handler = &proc_dointvec
91 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
94 .procname = "zero_copy",
95 .data = ksocknal_tunables.ksnd_zc_min_frag,
96 .maxlen = sizeof (int),
98 .proc_handler = &proc_dointvec
100 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
104 .data = ksocknal_tunables.ksnd_typed_conns,
105 .maxlen = sizeof (int),
107 .proc_handler = &proc_dointvec
109 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
112 .procname = "min_bulk",
113 .data = ksocknal_tunables.ksnd_min_bulk,
114 .maxlen = sizeof (int),
116 .proc_handler = &proc_dointvec
118 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
121 .procname = "rx_buffer_size",
122 .data = ksocknal_tunables.ksnd_rx_buffer_size,
123 .maxlen = sizeof(int),
125 .proc_handler = &proc_dointvec
127 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
130 .procname = "tx_buffer_size",
131 .data = ksocknal_tunables.ksnd_tx_buffer_size,
132 .maxlen = sizeof(int),
134 .proc_handler = &proc_dointvec
136 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
140 .data = ksocknal_tunables.ksnd_nagle,
141 .maxlen = sizeof(int),
143 .proc_handler = &proc_dointvec
146 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
149 .procname = "irq_affinity",
150 .data = ksocknal_tunables.ksnd_irq_affinity,
151 .maxlen = sizeof(int),
153 .proc_handler = &proc_dointvec
156 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
159 .procname = "keepalive_idle",
160 .data = ksocknal_tunables.ksnd_keepalive_idle,
161 .maxlen = sizeof(int),
163 .proc_handler = &proc_dointvec
165 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
168 .procname = "keepalive_count",
169 .data = ksocknal_tunables.ksnd_keepalive_count,
170 .maxlen = sizeof(int),
172 .proc_handler = &proc_dointvec
174 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
177 .procname = "keepalive_intvl",
178 .data = ksocknal_tunables.ksnd_keepalive_intvl,
179 .maxlen = sizeof(int),
181 .proc_handler = &proc_dointvec
183 #ifdef SOCKNAL_BACKOFF
184 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
187 .procname = "backoff_init",
188 .data = ksocknal_tunables.ksnd_backoff_init,
189 .maxlen = sizeof(int),
191 .proc_handler = &proc_dointvec
193 ksocknal_ctl_table[i++] = (cfs_sysctl_table_t)
196 .procname = "backoff_max",
197 .data = ksocknal_tunables.ksnd_backoff_max,
198 .maxlen = sizeof(int),
200 .proc_handler = &proc_dointvec
205 LASSERT (i < sizeof(ksocknal_ctl_table)/sizeof(ksocknal_ctl_table[0]));
207 ksocknal_tunables.ksnd_sysctl =
208 cfs_register_sysctl_table(ksocknal_top_ctl_table, 0);
210 if (ksocknal_tunables.ksnd_sysctl == NULL)
211 CWARN("Can't setup /proc tunables\n");
217 ksocknal_lib_tunables_fini ()
219 if (ksocknal_tunables.ksnd_sysctl != NULL)
220 cfs_unregister_sysctl_table(ksocknal_tunables.ksnd_sysctl);
224 ksocknal_lib_tunables_init ()
230 ksocknal_lib_tunables_fini ()
233 #endif /* # if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM */
236 ksocknal_lib_bind_irq (unsigned int irq)
238 #if (defined(CONFIG_SMP) && CPU_AFFINITY)
242 ksock_irqinfo_t *info;
243 char *argv[] = {"/bin/sh",
247 char *envp[] = {"HOME=/",
248 "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
251 LASSERT (irq < NR_IRQS);
252 if (irq == 0) /* software NIC or affinity disabled */
255 info = &ksocknal_data.ksnd_irqinfo[irq];
257 write_lock_bh (&ksocknal_data.ksnd_global_lock);
259 LASSERT (info->ksni_valid);
260 bind = !info->ksni_bound;
261 info->ksni_bound = 1;
263 write_unlock_bh (&ksocknal_data.ksnd_global_lock);
265 if (!bind) /* bound already */
268 cpu = ksocknal_irqsched2cpu(info->ksni_sched);
269 snprintf (cmdline, sizeof (cmdline),
270 "echo %d > /proc/irq/%u/smp_affinity", 1 << cpu, irq);
272 LCONSOLE_INFO("Binding irq %u to CPU %d with cmd: %s\n",
275 /* FIXME: Find a better method of setting IRQ affinity...
278 USERMODEHELPER(argv[0], argv, envp);
283 ksocknal_lib_get_conn_addrs (ksock_conn_t *conn)
285 int rc = libcfs_sock_getaddr(conn->ksnc_sock, 1,
289 /* Didn't need the {get,put}connsock dance to deref ksnc_sock... */
290 LASSERT (!conn->ksnc_closing);
293 CERROR ("Error %d getting sock peer IP\n", rc);
297 rc = libcfs_sock_getaddr(conn->ksnc_sock, 0,
298 &conn->ksnc_myipaddr, NULL);
300 CERROR ("Error %d getting sock local IP\n", rc);
308 ksocknal_lib_sock_irq (struct socket *sock)
312 struct dst_entry *dst;
314 if (!*ksocknal_tunables.ksnd_irq_affinity)
317 dst = sk_dst_get (sock->sk);
319 if (dst->dev != NULL) {
321 if (irq >= NR_IRQS) {
322 CERROR ("Unexpected IRQ %x\n", irq);
334 ksocknal_lib_zc_capable(struct socket *sock)
336 int caps = sock->sk->sk_route_caps;
338 /* ZC if the socket supports scatter/gather and doesn't need software
340 return ((caps & NETIF_F_SG) != 0 &&
341 (caps & (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)) != 0);
345 ksocknal_lib_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
347 struct socket *sock = conn->ksnc_sock;
351 if (*ksocknal_tunables.ksnd_enable_csum && /* checksum enabled */
352 conn->ksnc_proto == &ksocknal_protocol_v2x && /* V2.x connection */
353 tx->tx_nob == tx->tx_resid && /* frist sending */
354 tx->tx_msg.ksm_csum == 0) /* not checksummed */
355 ksocknal_lib_csum_tx(tx);
357 /* NB we can't trust socket ops to either consume our iovs
358 * or leave them alone. */
361 #if SOCKNAL_SINGLE_FRAG_TX
362 struct iovec scratch;
363 struct iovec *scratchiov = &scratch;
364 unsigned int niov = 1;
366 struct iovec *scratchiov = conn->ksnc_tx_scratch_iov;
367 unsigned int niov = tx->tx_niov;
369 struct msghdr msg = {
372 .msg_iov = scratchiov,
376 .msg_flags = MSG_DONTWAIT
378 mm_segment_t oldmm = get_fs();
381 for (nob = i = 0; i < niov; i++) {
382 scratchiov[i] = tx->tx_iov[i];
383 nob += scratchiov[i].iov_len;
386 if (!list_empty(&conn->ksnc_tx_queue) ||
388 msg.msg_flags |= MSG_MORE;
391 rc = sock_sendmsg(sock, &msg, nob);
398 ksocknal_lib_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
400 struct socket *sock = conn->ksnc_sock;
401 lnet_kiov_t *kiov = tx->tx_kiov;
405 /* NB we can't trust socket ops to either consume our iovs
406 * or leave them alone. */
408 if (kiov->kiov_len >= *ksocknal_tunables.ksnd_zc_min_frag &&
409 tx->tx_msg.ksm_zc_req_cookie != 0) {
410 /* Zero copy is enabled */
411 struct page *page = kiov->kiov_page;
412 int offset = kiov->kiov_offset;
413 int fragsize = kiov->kiov_len;
414 int msgflg = MSG_DONTWAIT;
416 CDEBUG(D_NET, "page %p + offset %x for %d\n",
417 page, offset, kiov->kiov_len);
419 if (!list_empty(&conn->ksnc_tx_queue) ||
420 fragsize < tx->tx_resid)
423 rc = tcp_sendpage(sock, page, offset, fragsize, msgflg);
425 #if SOCKNAL_SINGLE_FRAG_TX || !SOCKNAL_RISK_KMAP_DEADLOCK
426 struct iovec scratch;
427 struct iovec *scratchiov = &scratch;
428 unsigned int niov = 1;
430 #ifdef CONFIG_HIGHMEM
431 #warning "XXX risk of kmap deadlock on multiple frags..."
433 struct iovec *scratchiov = conn->ksnc_tx_scratch_iov;
434 unsigned int niov = tx->tx_nkiov;
436 struct msghdr msg = {
439 .msg_iov = scratchiov,
443 .msg_flags = MSG_DONTWAIT
445 mm_segment_t oldmm = get_fs();
448 for (nob = i = 0; i < niov; i++) {
449 scratchiov[i].iov_base = kmap(kiov[i].kiov_page) +
451 nob += scratchiov[i].iov_len = kiov[i].kiov_len;
454 if (!list_empty(&conn->ksnc_tx_queue) ||
456 msg.msg_flags |= MSG_MORE;
459 rc = sock_sendmsg(sock, &msg, nob);
462 for (i = 0; i < niov; i++)
463 kunmap(kiov[i].kiov_page);
469 ksocknal_lib_eager_ack (ksock_conn_t *conn)
472 mm_segment_t oldmm = get_fs();
473 struct socket *sock = conn->ksnc_sock;
475 /* Remind the socket to ACK eagerly. If I don't, the socket might
476 * think I'm about to send something it could piggy-back the ACK
477 * on, introducing delay in completing zero-copy sends in my
481 sock->ops->setsockopt (sock, SOL_TCP, TCP_QUICKACK,
482 (char *)&opt, sizeof (opt));
487 ksocknal_lib_recv_iov (ksock_conn_t *conn)
489 #if SOCKNAL_SINGLE_FRAG_RX
490 struct iovec scratch;
491 struct iovec *scratchiov = &scratch;
492 unsigned int niov = 1;
494 struct iovec *scratchiov = conn->ksnc_rx_scratch_iov;
495 unsigned int niov = conn->ksnc_rx_niov;
497 struct iovec *iov = conn->ksnc_rx_iov;
498 struct msghdr msg = {
501 .msg_iov = scratchiov,
507 mm_segment_t oldmm = get_fs();
515 /* NB we can't trust socket ops to either consume our iovs
516 * or leave them alone. */
519 for (nob = i = 0; i < niov; i++) {
520 scratchiov[i] = iov[i];
521 nob += scratchiov[i].iov_len;
523 LASSERT (nob <= conn->ksnc_rx_nob_wanted);
526 rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
527 /* NB this is just a boolean..........................^ */
531 if (conn->ksnc_proto == &ksocknal_protocol_v2x) {
532 saved_csum = conn->ksnc_msg.ksm_csum;
533 conn->ksnc_msg.ksm_csum = 0;
536 if (saved_csum != 0) {
537 /* accumulate checksum */
538 for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {
541 fragnob = iov[i].iov_len;
545 conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum,
546 iov[i].iov_base, fragnob);
548 conn->ksnc_msg.ksm_csum = saved_csum;
555 ksocknal_lib_recv_kiov (ksock_conn_t *conn)
557 #if SOCKNAL_SINGLE_FRAG_RX || !SOCKNAL_RISK_KMAP_DEADLOCK
558 struct iovec scratch;
559 struct iovec *scratchiov = &scratch;
560 unsigned int niov = 1;
562 #ifdef CONFIG_HIGHMEM
563 #warning "XXX risk of kmap deadlock on multiple frags..."
565 struct iovec *scratchiov = conn->ksnc_rx_scratch_iov;
566 unsigned int niov = conn->ksnc_rx_nkiov;
568 lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
569 struct msghdr msg = {
572 .msg_iov = scratchiov,
578 mm_segment_t oldmm = get_fs();
586 /* NB we can't trust socket ops to either consume our iovs
587 * or leave them alone. */
588 for (nob = i = 0; i < niov; i++) {
589 scratchiov[i].iov_base = kmap(kiov[i].kiov_page) + kiov[i].kiov_offset;
590 nob += scratchiov[i].iov_len = kiov[i].kiov_len;
592 LASSERT (nob <= conn->ksnc_rx_nob_wanted);
595 rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
596 /* NB this is just a boolean.......................^ */
599 if (conn->ksnc_msg.ksm_csum != 0) {
600 for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {
603 /* Dang! have to kmap again because I have nowhere to stash the
604 * mapped address. But by doing it while the page is still
605 * mapped, the kernel just bumps the map count and returns me
606 * the address it stashed. */
607 base = kmap(kiov[i].kiov_page) + kiov[i].kiov_offset;
608 fragnob = kiov[i].kiov_len;
612 conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum,
615 kunmap(kiov[i].kiov_page);
618 for (i = 0; i < niov; i++)
619 kunmap(kiov[i].kiov_page);
624 void ksocknal_lib_csum_tx(ksock_tx_t *tx)
630 LASSERT(tx->tx_iov[0].iov_base == (void *)&tx->tx_msg);
631 LASSERT(tx->tx_conn != NULL);
632 LASSERT(tx->tx_conn->ksnc_proto == &ksocknal_protocol_v2x);
634 tx->tx_msg.ksm_csum = 0;
636 csum = ksocknal_csum(~0, (void *)tx->tx_iov[0].iov_base,
637 tx->tx_iov[0].iov_len);
639 if (tx->tx_kiov != NULL) {
640 for (i = 0; i < tx->tx_nkiov; i++) {
641 base = kmap(tx->tx_kiov[i].kiov_page) +
642 tx->tx_kiov[i].kiov_offset;
644 csum = ksocknal_csum(csum, base, tx->tx_kiov[i].kiov_len);
646 kunmap(tx->tx_kiov[i].kiov_page);
649 for (i = 1; i < tx->tx_niov; i++)
650 csum = ksocknal_csum(csum, tx->tx_iov[i].iov_base,
651 tx->tx_iov[i].iov_len);
654 if (*ksocknal_tunables.ksnd_inject_csum_error) {
656 *ksocknal_tunables.ksnd_inject_csum_error = 0;
659 tx->tx_msg.ksm_csum = csum;
663 ksocknal_lib_get_conn_tunables (ksock_conn_t *conn, int *txmem, int *rxmem, int *nagle)
665 mm_segment_t oldmm = get_fs ();
666 struct socket *sock = conn->ksnc_sock;
670 rc = ksocknal_connsock_addref(conn);
672 LASSERT (conn->ksnc_closing);
673 *txmem = *rxmem = *nagle = 0;
677 rc = libcfs_sock_getbuf(sock, txmem, rxmem);
679 len = sizeof(*nagle);
681 rc = sock->ops->getsockopt(sock, SOL_TCP, TCP_NODELAY,
682 (char *)nagle, &len);
686 ksocknal_connsock_decref(conn);
691 *txmem = *rxmem = *nagle = 0;
697 ksocknal_lib_setup_sock (struct socket *sock)
699 mm_segment_t oldmm = get_fs ();
706 struct linger linger;
708 sock->sk->sk_allocation = GFP_NOFS;
710 /* Ensure this socket aborts active sends immediately when we close
717 rc = sock_setsockopt (sock, SOL_SOCKET, SO_LINGER,
718 (char *)&linger, sizeof (linger));
721 CERROR ("Can't set SO_LINGER: %d\n", rc);
727 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_LINGER2,
728 (char *)&option, sizeof (option));
731 CERROR ("Can't set SO_LINGER2: %d\n", rc);
735 if (!*ksocknal_tunables.ksnd_nagle) {
739 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_NODELAY,
740 (char *)&option, sizeof (option));
743 CERROR ("Can't disable nagle: %d\n", rc);
748 rc = libcfs_sock_setbuf(sock,
749 *ksocknal_tunables.ksnd_tx_buffer_size,
750 *ksocknal_tunables.ksnd_rx_buffer_size);
752 CERROR ("Can't set buffer tx %d, rx %d buffers: %d\n",
753 *ksocknal_tunables.ksnd_tx_buffer_size,
754 *ksocknal_tunables.ksnd_rx_buffer_size, rc);
758 /* TCP_BACKOFF_* sockopt tunables unsupported in stock kernels */
759 #ifdef SOCKNAL_BACKOFF
760 if (*ksocknal_tunables.ksnd_backoff_init > 0) {
761 option = *ksocknal_tunables.ksnd_backoff_init;
764 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_BACKOFF_INIT,
765 (char *)&option, sizeof (option));
768 CERROR ("Can't set initial tcp backoff %d: %d\n",
774 if (*ksocknal_tunables.ksnd_backoff_max > 0) {
775 option = *ksocknal_tunables.ksnd_backoff_max;
778 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_BACKOFF_MAX,
779 (char *)&option, sizeof (option));
782 CERROR ("Can't set maximum tcp backoff %d: %d\n",
789 /* snapshot tunables */
790 keep_idle = *ksocknal_tunables.ksnd_keepalive_idle;
791 keep_count = *ksocknal_tunables.ksnd_keepalive_count;
792 keep_intvl = *ksocknal_tunables.ksnd_keepalive_intvl;
794 do_keepalive = (keep_idle > 0 && keep_count > 0 && keep_intvl > 0);
796 option = (do_keepalive ? 1 : 0);
798 rc = sock_setsockopt (sock, SOL_SOCKET, SO_KEEPALIVE,
799 (char *)&option, sizeof (option));
802 CERROR ("Can't set SO_KEEPALIVE: %d\n", rc);
810 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPIDLE,
811 (char *)&keep_idle, sizeof (keep_idle));
814 CERROR ("Can't set TCP_KEEPIDLE: %d\n", rc);
819 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPINTVL,
820 (char *)&keep_intvl, sizeof (keep_intvl));
823 CERROR ("Can't set TCP_KEEPINTVL: %d\n", rc);
828 rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPCNT,
829 (char *)&keep_count, sizeof (keep_count));
832 CERROR ("Can't set TCP_KEEPCNT: %d\n", rc);
839 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
840 struct tcp_opt *sock2tcp_opt(struct sock *sk)
842 return &(sk->tp_pinfo.af_tcp);
844 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
845 #define sock2tcp_opt(sk) tcp_sk(sk)
847 struct tcp_opt *sock2tcp_opt(struct sock *sk)
849 struct tcp_sock *s = (struct tcp_sock *)sk;
855 ksocknal_lib_push_conn (ksock_conn_t *conn)
858 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,11))
868 rc = ksocknal_connsock_addref(conn);
869 if (rc != 0) /* being shut down */
872 sk = conn->ksnc_sock->sk;
873 tp = sock2tcp_opt(sk);
876 nonagle = tp->nonagle;
883 rc = sk->sk_prot->setsockopt (sk, SOL_TCP, TCP_NODELAY,
884 (char *)&val, sizeof (val));
890 tp->nonagle = nonagle;
893 ksocknal_connsock_decref(conn);
896 extern void ksocknal_read_callback (ksock_conn_t *conn);
897 extern void ksocknal_write_callback (ksock_conn_t *conn);
899 * socket call back in Linux
902 ksocknal_data_ready (struct sock *sk, int n)
907 /* interleave correctly with closing sockets... */
909 read_lock (&ksocknal_data.ksnd_global_lock);
911 conn = sk->sk_user_data;
912 if (conn == NULL) { /* raced with ksocknal_terminate_conn */
913 LASSERT (sk->sk_data_ready != &ksocknal_data_ready);
914 sk->sk_data_ready (sk, n);
916 ksocknal_read_callback(conn);
918 read_unlock (&ksocknal_data.ksnd_global_lock);
924 ksocknal_write_space (struct sock *sk)
930 /* interleave correctly with closing sockets... */
932 read_lock (&ksocknal_data.ksnd_global_lock);
934 conn = sk->sk_user_data;
935 wspace = SOCKNAL_WSPACE(sk);
936 min_wpace = SOCKNAL_MIN_WSPACE(sk);
938 CDEBUG(D_NET, "sk %p wspace %d low water %d conn %p%s%s%s\n",
939 sk, wspace, min_wpace, conn,
940 (conn == NULL) ? "" : (conn->ksnc_tx_ready ?
941 " ready" : " blocked"),
942 (conn == NULL) ? "" : (conn->ksnc_tx_scheduled ?
943 " scheduled" : " idle"),
944 (conn == NULL) ? "" : (list_empty (&conn->ksnc_tx_queue) ?
945 " empty" : " queued"));
947 if (conn == NULL) { /* raced with ksocknal_terminate_conn */
948 LASSERT (sk->sk_write_space != &ksocknal_write_space);
949 sk->sk_write_space (sk);
951 read_unlock (&ksocknal_data.ksnd_global_lock);
955 if (wspace >= min_wpace) { /* got enough space */
956 ksocknal_write_callback(conn);
958 /* Clear SOCK_NOSPACE _after_ ksocknal_write_callback so the
959 * ENOMEM check in ksocknal_transmit is race-free (think about
962 clear_bit (SOCK_NOSPACE, &sk->sk_socket->flags);
965 read_unlock (&ksocknal_data.ksnd_global_lock);
969 ksocknal_lib_save_callback(struct socket *sock, ksock_conn_t *conn)
971 conn->ksnc_saved_data_ready = sock->sk->sk_data_ready;
972 conn->ksnc_saved_write_space = sock->sk->sk_write_space;
976 ksocknal_lib_set_callback(struct socket *sock, ksock_conn_t *conn)
978 sock->sk->sk_user_data = conn;
979 sock->sk->sk_data_ready = ksocknal_data_ready;
980 sock->sk->sk_write_space = ksocknal_write_space;
985 ksocknal_lib_reset_callback(struct socket *sock, ksock_conn_t *conn)
987 /* Remove conn's network callbacks.
988 * NB I _have_ to restore the callback, rather than storing a noop,
989 * since the socket could survive past this module being unloaded!! */
990 sock->sk->sk_data_ready = conn->ksnc_saved_data_ready;
991 sock->sk->sk_write_space = conn->ksnc_saved_write_space;
993 /* A callback could be in progress already; they hold a read lock
994 * on ksnd_global_lock (to serialise with me) and NOOP if
995 * sk_user_data is NULL. */
996 sock->sk->sk_user_data = NULL;