diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib-linux.c')
| -rw-r--r-- | drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib-linux.c | 1088 |
1 files changed, 1088 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib-linux.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib-linux.c new file mode 100644 index 000000000000..3e08fe2d1489 --- /dev/null +++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib-linux.c @@ -0,0 +1,1088 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2011, 2012, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + */ + +#include "socklnd.h" + +# if defined(CONFIG_SYSCTL) && !CFS_SYSFS_MODULE_PARM + + +enum { + SOCKLND_TIMEOUT = 1, + SOCKLND_CREDITS, + SOCKLND_PEER_TXCREDITS, + SOCKLND_PEER_RTRCREDITS, + SOCKLND_PEER_TIMEOUT, + SOCKLND_NCONNDS, + SOCKLND_RECONNECTS_MIN, + SOCKLND_RECONNECTS_MAX, + SOCKLND_EAGER_ACK, + SOCKLND_ZERO_COPY, + SOCKLND_TYPED, + SOCKLND_BULK_MIN, + SOCKLND_RX_BUFFER_SIZE, + SOCKLND_TX_BUFFER_SIZE, + SOCKLND_NAGLE, + SOCKLND_IRQ_AFFINITY, + SOCKLND_ROUND_ROBIN, + SOCKLND_KEEPALIVE, + SOCKLND_KEEPALIVE_IDLE, + SOCKLND_KEEPALIVE_COUNT, + SOCKLND_KEEPALIVE_INTVL, + SOCKLND_BACKOFF_INIT, + SOCKLND_BACKOFF_MAX, + SOCKLND_PROTOCOL, + SOCKLND_ZERO_COPY_RECV, + SOCKLND_ZERO_COPY_RECV_MIN_NFRAGS +}; + +static ctl_table_t ksocknal_ctl_table[] = { + { + .ctl_name = SOCKLND_TIMEOUT, + .procname = "timeout", + .data = &ksocknal_tunables.ksnd_timeout, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_CREDITS, + .procname = "credits", + .data = &ksocknal_tunables.ksnd_credits, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_PEER_TXCREDITS, + .procname = "peer_credits", + .data = &ksocknal_tunables.ksnd_peertxcredits, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_PEER_RTRCREDITS, + .procname = "peer_buffer_credits", + .data = &ksocknal_tunables.ksnd_peerrtrcredits, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_PEER_TIMEOUT, + .procname = "peer_timeout", + .data = &ksocknal_tunables.ksnd_peertimeout, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_NCONNDS, + .procname = "nconnds", + .data = &ksocknal_tunables.ksnd_nconnds, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_RECONNECTS_MIN, + .procname = "min_reconnectms", + .data = &ksocknal_tunables.ksnd_min_reconnectms, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_RECONNECTS_MAX, + .procname = "max_reconnectms", + .data = &ksocknal_tunables.ksnd_max_reconnectms, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_EAGER_ACK, + .procname = "eager_ack", + .data = &ksocknal_tunables.ksnd_eager_ack, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_ZERO_COPY, + .procname = "zero_copy", + .data = &ksocknal_tunables.ksnd_zc_min_payload, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_ZERO_COPY_RECV, + .procname = "zero_copy_recv", + .data = &ksocknal_tunables.ksnd_zc_recv, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + + { + .ctl_name = SOCKLND_ZERO_COPY_RECV_MIN_NFRAGS, + .procname = "zero_copy_recv", + .data = &ksocknal_tunables.ksnd_zc_recv_min_nfrags, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_TYPED, + .procname = "typed", + .data = &ksocknal_tunables.ksnd_typed_conns, + .maxlen = sizeof (int), + .mode = 0444, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_BULK_MIN, + .procname = "min_bulk", + .data = &ksocknal_tunables.ksnd_min_bulk, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_RX_BUFFER_SIZE, + .procname = "rx_buffer_size", + .data = &ksocknal_tunables.ksnd_rx_buffer_size, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_TX_BUFFER_SIZE, + .procname = "tx_buffer_size", + .data = &ksocknal_tunables.ksnd_tx_buffer_size, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_NAGLE, + .procname = "nagle", + .data = &ksocknal_tunables.ksnd_nagle, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_ROUND_ROBIN, + .procname = "round_robin", + .data = &ksocknal_tunables.ksnd_round_robin, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_KEEPALIVE, + .procname = "keepalive", + .data = &ksocknal_tunables.ksnd_keepalive, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_KEEPALIVE_IDLE, + .procname = "keepalive_idle", + .data = &ksocknal_tunables.ksnd_keepalive_idle, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_KEEPALIVE_COUNT, + .procname = "keepalive_count", + .data = &ksocknal_tunables.ksnd_keepalive_count, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, + { + .ctl_name = SOCKLND_KEEPALIVE_INTVL, + .procname = "keepalive_intvl", + .data = &ksocknal_tunables.ksnd_keepalive_intvl, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, +#if SOCKNAL_VERSION_DEBUG + { + .ctl_name = SOCKLND_PROTOCOL, + .procname = "protocol", + .data = &ksocknal_tunables.ksnd_protocol, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &sysctl_intvec, + }, +#endif + {0} +}; + + +ctl_table_t ksocknal_top_ctl_table[] = { + { + .ctl_name = CTL_SOCKLND, + .procname = "socknal", + .data = NULL, + .maxlen = 0, + .mode = 0555, + .child = ksocknal_ctl_table + }, + { 0 } +}; + +int +ksocknal_lib_tunables_init () +{ + if (!*ksocknal_tunables.ksnd_typed_conns) { + int rc = -EINVAL; +#if SOCKNAL_VERSION_DEBUG + if (*ksocknal_tunables.ksnd_protocol < 3) + rc = 0; +#endif + if (rc != 0) { + CERROR("Protocol V3.x MUST have typed connections\n"); + return rc; + } + } + + if (*ksocknal_tunables.ksnd_zc_recv_min_nfrags < 2) + *ksocknal_tunables.ksnd_zc_recv_min_nfrags = 2; + if (*ksocknal_tunables.ksnd_zc_recv_min_nfrags > LNET_MAX_IOV) + *ksocknal_tunables.ksnd_zc_recv_min_nfrags = LNET_MAX_IOV; + + ksocknal_tunables.ksnd_sysctl = + cfs_register_sysctl_table(ksocknal_top_ctl_table, 0); + + if (ksocknal_tunables.ksnd_sysctl == NULL) + CWARN("Can't setup /proc tunables\n"); + + return 0; +} + +void +ksocknal_lib_tunables_fini () +{ + if (ksocknal_tunables.ksnd_sysctl != NULL) + unregister_sysctl_table(ksocknal_tunables.ksnd_sysctl); +} +#else +int +ksocknal_lib_tunables_init () +{ + return 0; +} + +void +ksocknal_lib_tunables_fini () +{ +} +#endif /* # if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM */ + +int +ksocknal_lib_get_conn_addrs (ksock_conn_t *conn) +{ + int rc = libcfs_sock_getaddr(conn->ksnc_sock, 1, + &conn->ksnc_ipaddr, + &conn->ksnc_port); + + /* Didn't need the {get,put}connsock dance to deref ksnc_sock... */ + LASSERT (!conn->ksnc_closing); + + if (rc != 0) { + CERROR ("Error %d getting sock peer IP\n", rc); + return rc; + } + + rc = libcfs_sock_getaddr(conn->ksnc_sock, 0, + &conn->ksnc_myipaddr, NULL); + if (rc != 0) { + CERROR ("Error %d getting sock local IP\n", rc); + return rc; + } + + return 0; +} + +int +ksocknal_lib_zc_capable(ksock_conn_t *conn) +{ + int caps = conn->ksnc_sock->sk->sk_route_caps; + + if (conn->ksnc_proto == &ksocknal_protocol_v1x) + return 0; + + /* ZC if the socket supports scatter/gather and doesn't need software + * checksums */ + return ((caps & NETIF_F_SG) != 0 && (caps & NETIF_F_ALL_CSUM) != 0); +} + +int +ksocknal_lib_send_iov (ksock_conn_t *conn, ksock_tx_t *tx) +{ + struct socket *sock = conn->ksnc_sock; + int nob; + int rc; + + if (*ksocknal_tunables.ksnd_enable_csum && /* checksum enabled */ + conn->ksnc_proto == &ksocknal_protocol_v2x && /* V2.x connection */ + tx->tx_nob == tx->tx_resid && /* frist sending */ + tx->tx_msg.ksm_csum == 0) /* not checksummed */ + ksocknal_lib_csum_tx(tx); + + /* NB we can't trust socket ops to either consume our iovs + * or leave them alone. */ + + { +#if SOCKNAL_SINGLE_FRAG_TX + struct iovec scratch; + struct iovec *scratchiov = &scratch; + unsigned int niov = 1; +#else + struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov; + unsigned int niov = tx->tx_niov; +#endif + struct msghdr msg = { + .msg_name = NULL, + .msg_namelen = 0, + .msg_iov = scratchiov, + .msg_iovlen = niov, + .msg_control = NULL, + .msg_controllen = 0, + .msg_flags = MSG_DONTWAIT + }; + mm_segment_t oldmm = get_fs(); + int i; + + for (nob = i = 0; i < niov; i++) { + scratchiov[i] = tx->tx_iov[i]; + nob += scratchiov[i].iov_len; + } + + if (!list_empty(&conn->ksnc_tx_queue) || + nob < tx->tx_resid) + msg.msg_flags |= MSG_MORE; + + set_fs (KERNEL_DS); + rc = sock_sendmsg(sock, &msg, nob); + set_fs (oldmm); + } + return rc; +} + +int +ksocknal_lib_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx) +{ + struct socket *sock = conn->ksnc_sock; + lnet_kiov_t *kiov = tx->tx_kiov; + int rc; + int nob; + + /* Not NOOP message */ + LASSERT (tx->tx_lnetmsg != NULL); + + /* NB we can't trust socket ops to either consume our iovs + * or leave them alone. */ + if (tx->tx_msg.ksm_zc_cookies[0] != 0) { + /* Zero copy is enabled */ + struct sock *sk = sock->sk; + struct page *page = kiov->kiov_page; + int offset = kiov->kiov_offset; + int fragsize = kiov->kiov_len; + int msgflg = MSG_DONTWAIT; + + CDEBUG(D_NET, "page %p + offset %x for %d\n", + page, offset, kiov->kiov_len); + + if (!list_empty(&conn->ksnc_tx_queue) || + fragsize < tx->tx_resid) + msgflg |= MSG_MORE; + + if (sk->sk_prot->sendpage != NULL) { + rc = sk->sk_prot->sendpage(sk, page, + offset, fragsize, msgflg); + } else { + rc = cfs_tcp_sendpage(sk, page, offset, fragsize, + msgflg); + } + } else { +#if SOCKNAL_SINGLE_FRAG_TX || !SOCKNAL_RISK_KMAP_DEADLOCK + struct iovec scratch; + struct iovec *scratchiov = &scratch; + unsigned int niov = 1; +#else +#ifdef CONFIG_HIGHMEM +#warning "XXX risk of kmap deadlock on multiple frags..." +#endif + struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov; + unsigned int niov = tx->tx_nkiov; +#endif + struct msghdr msg = { + .msg_name = NULL, + .msg_namelen = 0, + .msg_iov = scratchiov, + .msg_iovlen = niov, + .msg_control = NULL, + .msg_controllen = 0, + .msg_flags = MSG_DONTWAIT + }; + mm_segment_t oldmm = get_fs(); + int i; + + for (nob = i = 0; i < niov; i++) { + scratchiov[i].iov_base = kmap(kiov[i].kiov_page) + + kiov[i].kiov_offset; + nob += scratchiov[i].iov_len = kiov[i].kiov_len; + } + + if (!list_empty(&conn->ksnc_tx_queue) || + nob < tx->tx_resid) + msg.msg_flags |= MSG_MORE; + + set_fs (KERNEL_DS); + rc = sock_sendmsg(sock, &msg, nob); + set_fs (oldmm); + + for (i = 0; i < niov; i++) + kunmap(kiov[i].kiov_page); + } + return rc; +} + +void +ksocknal_lib_eager_ack (ksock_conn_t *conn) +{ + int opt = 1; + mm_segment_t oldmm = get_fs(); + struct socket *sock = conn->ksnc_sock; + + /* Remind the socket to ACK eagerly. If I don't, the socket might + * think I'm about to send something it could piggy-back the ACK + * on, introducing delay in completing zero-copy sends in my + * peer. */ + + set_fs(KERNEL_DS); + sock->ops->setsockopt (sock, SOL_TCP, TCP_QUICKACK, + (char *)&opt, sizeof (opt)); + set_fs(oldmm); +} + +int +ksocknal_lib_recv_iov (ksock_conn_t *conn) +{ +#if SOCKNAL_SINGLE_FRAG_RX + struct iovec scratch; + struct iovec *scratchiov = &scratch; + unsigned int niov = 1; +#else + struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov; + unsigned int niov = conn->ksnc_rx_niov; +#endif + struct iovec *iov = conn->ksnc_rx_iov; + struct msghdr msg = { + .msg_name = NULL, + .msg_namelen = 0, + .msg_iov = scratchiov, + .msg_iovlen = niov, + .msg_control = NULL, + .msg_controllen = 0, + .msg_flags = 0 + }; + mm_segment_t oldmm = get_fs(); + int nob; + int i; + int rc; + int fragnob; + int sum; + __u32 saved_csum; + + /* NB we can't trust socket ops to either consume our iovs + * or leave them alone. */ + LASSERT (niov > 0); + + for (nob = i = 0; i < niov; i++) { + scratchiov[i] = iov[i]; + nob += scratchiov[i].iov_len; + } + LASSERT (nob <= conn->ksnc_rx_nob_wanted); + + set_fs (KERNEL_DS); + rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT); + /* NB this is just a boolean..........................^ */ + set_fs (oldmm); + + saved_csum = 0; + if (conn->ksnc_proto == &ksocknal_protocol_v2x) { + saved_csum = conn->ksnc_msg.ksm_csum; + conn->ksnc_msg.ksm_csum = 0; + } + + if (saved_csum != 0) { + /* accumulate checksum */ + for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) { + LASSERT (i < niov); + + fragnob = iov[i].iov_len; + if (fragnob > sum) + fragnob = sum; + + conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum, + iov[i].iov_base, fragnob); + } + conn->ksnc_msg.ksm_csum = saved_csum; + } + + return rc; +} + +static void +ksocknal_lib_kiov_vunmap(void *addr) +{ + if (addr == NULL) + return; + + vunmap(addr); +} + +static void * +ksocknal_lib_kiov_vmap(lnet_kiov_t *kiov, int niov, + struct iovec *iov, struct page **pages) +{ + void *addr; + int nob; + int i; + + if (!*ksocknal_tunables.ksnd_zc_recv || pages == NULL) + return NULL; + + LASSERT (niov <= LNET_MAX_IOV); + + if (niov < 2 || + niov < *ksocknal_tunables.ksnd_zc_recv_min_nfrags) + return NULL; + + for (nob = i = 0; i < niov; i++) { + if ((kiov[i].kiov_offset != 0 && i > 0) || + (kiov[i].kiov_offset + kiov[i].kiov_len != PAGE_CACHE_SIZE && i < niov - 1)) + return NULL; + + pages[i] = kiov[i].kiov_page; + nob += kiov[i].kiov_len; + } + + addr = vmap(pages, niov, VM_MAP, PAGE_KERNEL); + if (addr == NULL) + return NULL; + + iov->iov_base = addr + kiov[0].kiov_offset; + iov->iov_len = nob; + + return addr; +} + +int +ksocknal_lib_recv_kiov (ksock_conn_t *conn) +{ +#if SOCKNAL_SINGLE_FRAG_RX || !SOCKNAL_RISK_KMAP_DEADLOCK + struct iovec scratch; + struct iovec *scratchiov = &scratch; + struct page **pages = NULL; + unsigned int niov = 1; +#else +#ifdef CONFIG_HIGHMEM +#warning "XXX risk of kmap deadlock on multiple frags..." +#endif + struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov; + struct page **pages = conn->ksnc_scheduler->kss_rx_scratch_pgs; + unsigned int niov = conn->ksnc_rx_nkiov; +#endif + lnet_kiov_t *kiov = conn->ksnc_rx_kiov; + struct msghdr msg = { + .msg_name = NULL, + .msg_namelen = 0, + .msg_iov = scratchiov, + .msg_control = NULL, + .msg_controllen = 0, + .msg_flags = 0 + }; + mm_segment_t oldmm = get_fs(); + int nob; + int i; + int rc; + void *base; + void *addr; + int sum; + int fragnob; + + /* NB we can't trust socket ops to either consume our iovs + * or leave them alone. */ + if ((addr = ksocknal_lib_kiov_vmap(kiov, niov, scratchiov, pages)) != NULL) { + nob = scratchiov[0].iov_len; + msg.msg_iovlen = 1; + + } else { + for (nob = i = 0; i < niov; i++) { + nob += scratchiov[i].iov_len = kiov[i].kiov_len; + scratchiov[i].iov_base = kmap(kiov[i].kiov_page) + + kiov[i].kiov_offset; + } + msg.msg_iovlen = niov; + } + + LASSERT (nob <= conn->ksnc_rx_nob_wanted); + + set_fs (KERNEL_DS); + rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT); + /* NB this is just a boolean.......................^ */ + set_fs (oldmm); + + if (conn->ksnc_msg.ksm_csum != 0) { + for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) { + LASSERT (i < niov); + + /* Dang! have to kmap again because I have nowhere to stash the + * mapped address. But by doing it while the page is still + * mapped, the kernel just bumps the map count and returns me + * the address it stashed. */ + base = kmap(kiov[i].kiov_page) + kiov[i].kiov_offset; + fragnob = kiov[i].kiov_len; + if (fragnob > sum) + fragnob = sum; + + conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum, + base, fragnob); + + kunmap(kiov[i].kiov_page); + } + } + + if (addr != NULL) { + ksocknal_lib_kiov_vunmap(addr); + } else { + for (i = 0; i < niov; i++) + kunmap(kiov[i].kiov_page); + } + + return (rc); +} + +void +ksocknal_lib_csum_tx(ksock_tx_t *tx) +{ + int i; + __u32 csum; + void *base; + + LASSERT(tx->tx_iov[0].iov_base == (void *)&tx->tx_msg); + LASSERT(tx->tx_conn != NULL); + LASSERT(tx->tx_conn->ksnc_proto == &ksocknal_protocol_v2x); + + tx->tx_msg.ksm_csum = 0; + + csum = ksocknal_csum(~0, (void *)tx->tx_iov[0].iov_base, + tx->tx_iov[0].iov_len); + + if (tx->tx_kiov != NULL) { + for (i = 0; i < tx->tx_nkiov; i++) { + base = kmap(tx->tx_kiov[i].kiov_page) + + tx->tx_kiov[i].kiov_offset; + + csum = ksocknal_csum(csum, base, tx->tx_kiov[i].kiov_len); + + kunmap(tx->tx_kiov[i].kiov_page); + } + } else { + for (i = 1; i < tx->tx_niov; i++) + csum = ksocknal_csum(csum, tx->tx_iov[i].iov_base, + tx->tx_iov[i].iov_len); + } + + if (*ksocknal_tunables.ksnd_inject_csum_error) { + csum++; + *ksocknal_tunables.ksnd_inject_csum_error = 0; + } + + tx->tx_msg.ksm_csum = csum; +} + +int +ksocknal_lib_get_conn_tunables (ksock_conn_t *conn, int *txmem, int *rxmem, int *nagle) +{ + mm_segment_t oldmm = get_fs (); + struct socket *sock = conn->ksnc_sock; + int len; + int rc; + + rc = ksocknal_connsock_addref(conn); + if (rc != 0) { + LASSERT (conn->ksnc_closing); + *txmem = *rxmem = *nagle = 0; + return (-ESHUTDOWN); + } + + rc = libcfs_sock_getbuf(sock, txmem, rxmem); + if (rc == 0) { + len = sizeof(*nagle); + set_fs(KERNEL_DS); + rc = sock->ops->getsockopt(sock, SOL_TCP, TCP_NODELAY, + (char *)nagle, &len); + set_fs(oldmm); + } + + ksocknal_connsock_decref(conn); + + if (rc == 0) + *nagle = !*nagle; + else + *txmem = *rxmem = *nagle = 0; + + return (rc); +} + +int +ksocknal_lib_setup_sock (struct socket *sock) +{ + mm_segment_t oldmm = get_fs (); + int rc; + int option; + int keep_idle; + int keep_intvl; + int keep_count; + int do_keepalive; + struct linger linger; + + sock->sk->sk_allocation = GFP_NOFS; + + /* Ensure this socket aborts active sends immediately when we close + * it. */ + + linger.l_onoff = 0; + linger.l_linger = 0; + + set_fs (KERNEL_DS); + rc = sock_setsockopt (sock, SOL_SOCKET, SO_LINGER, + (char *)&linger, sizeof (linger)); + set_fs (oldmm); + if (rc != 0) { + CERROR ("Can't set SO_LINGER: %d\n", rc); + return (rc); + } + + option = -1; + set_fs (KERNEL_DS); + rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_LINGER2, + (char *)&option, sizeof (option)); + set_fs (oldmm); + if (rc != 0) { + CERROR ("Can't set SO_LINGER2: %d\n", rc); + return (rc); + } + + if (!*ksocknal_tunables.ksnd_nagle) { + option = 1; + + set_fs (KERNEL_DS); + rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_NODELAY, + (char *)&option, sizeof (option)); + set_fs (oldmm); + if (rc != 0) { + CERROR ("Can't disable nagle: %d\n", rc); + return (rc); + } + } + + rc = libcfs_sock_setbuf(sock, + *ksocknal_tunables.ksnd_tx_buffer_size, + *ksocknal_tunables.ksnd_rx_buffer_size); + if (rc != 0) { + CERROR ("Can't set buffer tx %d, rx %d buffers: %d\n", + *ksocknal_tunables.ksnd_tx_buffer_size, + *ksocknal_tunables.ksnd_rx_buffer_size, rc); + return (rc); + } + +/* TCP_BACKOFF_* sockopt tunables unsupported in stock kernels */ + + /* snapshot tunables */ + keep_idle = *ksocknal_tunables.ksnd_keepalive_idle; + keep_count = *ksocknal_tunables.ksnd_keepalive_count; + keep_intvl = *ksocknal_tunables.ksnd_keepalive_intvl; + + do_keepalive = (keep_idle > 0 && keep_count > 0 && keep_intvl > 0); + + option = (do_keepalive ? 1 : 0); + set_fs (KERNEL_DS); + rc = sock_setsockopt (sock, SOL_SOCKET, SO_KEEPALIVE, + (char *)&option, sizeof (option)); + set_fs (oldmm); + if (rc != 0) { + CERROR ("Can't set SO_KEEPALIVE: %d\n", rc); + return (rc); + } + + if (!do_keepalive) + return (0); + + set_fs (KERNEL_DS); + rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPIDLE, + (char *)&keep_idle, sizeof (keep_idle)); + set_fs (oldmm); + if (rc != 0) { + CERROR ("Can't set TCP_KEEPIDLE: %d\n", rc); + return (rc); + } + + set_fs (KERNEL_DS); + rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPINTVL, + (char *)&keep_intvl, sizeof (keep_intvl)); + set_fs (oldmm); + if (rc != 0) { + CERROR ("Can't set TCP_KEEPINTVL: %d\n", rc); + return (rc); + } + + set_fs (KERNEL_DS); + rc = sock->ops->setsockopt (sock, SOL_TCP, TCP_KEEPCNT, + (char *)&keep_count, sizeof (keep_count)); + set_fs (oldmm); + if (rc != 0) { + CERROR ("Can't set TCP_KEEPCNT: %d\n", rc); + return (rc); + } + + return (0); +} + +void +ksocknal_lib_push_conn (ksock_conn_t *conn) +{ + struct sock *sk; + struct tcp_sock *tp; + int nonagle; + int val = 1; + int rc; + mm_segment_t oldmm; + + rc = ksocknal_connsock_addref(conn); + if (rc != 0) /* being shut down */ + return; + + sk = conn->ksnc_sock->sk; + tp = tcp_sk(sk); + + lock_sock (sk); + nonagle = tp->nonagle; + tp->nonagle = 1; + release_sock (sk); + + oldmm = get_fs (); + set_fs (KERNEL_DS); + + rc = sk->sk_prot->setsockopt (sk, SOL_TCP, TCP_NODELAY, + (char *)&val, sizeof (val)); + LASSERT (rc == 0); + + set_fs (oldmm); + + lock_sock (sk); + tp->nonagle = nonagle; + release_sock (sk); + + ksocknal_connsock_decref(conn); +} + +extern void ksocknal_read_callback (ksock_conn_t *conn); +extern void ksocknal_write_callback (ksock_conn_t *conn); +/* + * socket call back in Linux + */ +static void +ksocknal_data_ready (struct sock *sk, int n) +{ + ksock_conn_t *conn; + ENTRY; + + /* interleave correctly with closing sockets... */ + LASSERT(!in_irq()); + read_lock(&ksocknal_data.ksnd_global_lock); + + conn = sk->sk_user_data; + if (conn == NULL) { /* raced with ksocknal_terminate_conn */ + LASSERT (sk->sk_data_ready != &ksocknal_data_ready); + sk->sk_data_ready (sk, n); + } else + ksocknal_read_callback(conn); + + read_unlock(&ksocknal_data.ksnd_global_lock); + + EXIT; +} + +static void +ksocknal_write_space (struct sock *sk) +{ + ksock_conn_t *conn; + int wspace; + int min_wpace; + + /* interleave correctly with closing sockets... */ + LASSERT(!in_irq()); + read_lock(&ksocknal_data.ksnd_global_lock); + + conn = sk->sk_user_data; + wspace = SOCKNAL_WSPACE(sk); + min_wpace = SOCKNAL_MIN_WSPACE(sk); + + CDEBUG(D_NET, "sk %p wspace %d low water %d conn %p%s%s%s\n", + sk, wspace, min_wpace, conn, + (conn == NULL) ? "" : (conn->ksnc_tx_ready ? + " ready" : " blocked"), + (conn == NULL) ? "" : (conn->ksnc_tx_scheduled ? + " scheduled" : " idle"), + (conn == NULL) ? "" : (list_empty (&conn->ksnc_tx_queue) ? + " empty" : " queued")); + + if (conn == NULL) { /* raced with ksocknal_terminate_conn */ + LASSERT (sk->sk_write_space != &ksocknal_write_space); + sk->sk_write_space (sk); + + read_unlock(&ksocknal_data.ksnd_global_lock); + return; + } + + if (wspace >= min_wpace) { /* got enough space */ + ksocknal_write_callback(conn); + + /* Clear SOCK_NOSPACE _after_ ksocknal_write_callback so the + * ENOMEM check in ksocknal_transmit is race-free (think about + * it). */ + + clear_bit (SOCK_NOSPACE, &sk->sk_socket->flags); + } + + read_unlock(&ksocknal_data.ksnd_global_lock); +} + +void +ksocknal_lib_save_callback(struct socket *sock, ksock_conn_t *conn) +{ + conn->ksnc_saved_data_ready = sock->sk->sk_data_ready; + conn->ksnc_saved_write_space = sock->sk->sk_write_space; +} + +void +ksocknal_lib_set_callback(struct socket *sock, ksock_conn_t *conn) +{ + sock->sk->sk_user_data = conn; + sock->sk->sk_data_ready = ksocknal_data_ready; + sock->sk->sk_write_space = ksocknal_write_space; + return; +} + +void +ksocknal_lib_reset_callback(struct socket *sock, ksock_conn_t *conn) +{ + /* Remove conn's network callbacks. + * NB I _have_ to restore the callback, rather than storing a noop, + * since the socket could survive past this module being unloaded!! */ + sock->sk->sk_data_ready = conn->ksnc_saved_data_ready; + sock->sk->sk_write_space = conn->ksnc_saved_write_space; + + /* A callback could be in progress already; they hold a read lock + * on ksnd_global_lock (to serialise with me) and NOOP if + * sk_user_data is NULL. */ + sock->sk->sk_user_data = NULL; + + return ; +} + +int +ksocknal_lib_memory_pressure(ksock_conn_t *conn) +{ + int rc = 0; + ksock_sched_t *sched; + + sched = conn->ksnc_scheduler; + spin_lock_bh(&sched->kss_lock); + + if (!SOCK_TEST_NOSPACE(conn->ksnc_sock) && + !conn->ksnc_tx_ready) { + /* SOCK_NOSPACE is set when the socket fills + * and cleared in the write_space callback + * (which also sets ksnc_tx_ready). If + * SOCK_NOSPACE and ksnc_tx_ready are BOTH + * zero, I didn't fill the socket and + * write_space won't reschedule me, so I + * return -ENOMEM to get my caller to retry + * after a timeout */ + rc = -ENOMEM; + } + + spin_unlock_bh(&sched->kss_lock); + + return rc; +} |