/* * Copyright (c) 2006 Oracle. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/in.h> #include <linux/module.h> #include <net/tcp.h> #include "rds.h" #include "tcp.h" /* only for info exporting */ static DEFINE_SPINLOCK(rds_tcp_tc_list_lock); static LIST_HEAD(rds_tcp_tc_list); static unsigned int rds_tcp_tc_count; /* Track rds_tcp_connection structs so they can be cleaned up */ static DEFINE_SPINLOCK(rds_tcp_conn_lock); static LIST_HEAD(rds_tcp_conn_list); static struct kmem_cache *rds_tcp_conn_slab; #define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024) /* doing it this way avoids calling tcp_sk() */ void rds_tcp_nonagle(struct socket *sock) { mm_segment_t oldfs = get_fs(); int val = 1; set_fs(KERNEL_DS); sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val, sizeof(val)); set_fs(oldfs); } void rds_tcp_tune(struct socket *sock) { struct sock *sk = sock->sk; rds_tcp_nonagle(sock); /* * We're trying to saturate gigabit with the default, * see svc_sock_setbufsize(). */ lock_sock(sk); sk->sk_sndbuf = RDS_TCP_DEFAULT_BUFSIZE; sk->sk_rcvbuf = RDS_TCP_DEFAULT_BUFSIZE; sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; release_sock(sk); } u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc) { return tcp_sk(tc->t_sock->sk)->snd_nxt; } u32 rds_tcp_snd_una(struct rds_tcp_connection *tc) { return tcp_sk(tc->t_sock->sk)->snd_una; } void rds_tcp_restore_callbacks(struct socket *sock, struct rds_tcp_connection *tc) { rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc); write_lock_bh(&sock->sk->sk_callback_lock); /* done under the callback_lock to serialize with write_space */ spin_lock(&rds_tcp_tc_list_lock); list_del_init(&tc->t_list_item); rds_tcp_tc_count--; spin_unlock(&rds_tcp_tc_list_lock); tc->t_sock = NULL; sock->sk->sk_write_space = tc->t_orig_write_space; sock->sk->sk_data_ready = tc->t_orig_data_ready; sock->sk->sk_state_change = tc->t_orig_state_change; sock->sk->sk_user_data = NULL; write_unlock_bh(&sock->sk->sk_callback_lock); } /* * This is the only path that sets tc->t_sock. Send and receive trust that * it is set. The RDS_CONN_CONNECTED bit protects those paths from being * called while it isn't set. */ void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn) { struct rds_tcp_connection *tc = conn->c_transport_data; rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc); write_lock_bh(&sock->sk->sk_callback_lock); /* done under the callback_lock to serialize with write_space */ spin_lock(&rds_tcp_tc_list_lock); list_add_tail(&tc->t_list_item, &rds_tcp_tc_list); rds_tcp_tc_count++; spin_unlock(&rds_tcp_tc_list_lock); /* accepted sockets need our listen data ready undone */ if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready) sock->sk->sk_data_ready = sock->sk->sk_user_data; tc->t_sock = sock; tc->conn = conn; tc->t_orig_data_ready = sock->sk->sk_data_ready; tc->t_orig_write_space = sock->sk->sk_write_space; tc->t_orig_state_change = sock->sk->sk_state_change; sock->sk->sk_user_data = conn; sock->sk->sk_data_ready = rds_tcp_data_ready; sock->sk->sk_write_space = rds_tcp_write_space; sock->sk->sk_state_change = rds_tcp_state_change; write_unlock_bh(&sock->sk->sk_callback_lock); } static void rds_tcp_tc_info(struct socket *sock, unsigned int len, struct rds_info_iterator *iter, struct rds_info_lengths *lens) { struct rds_info_tcp_socket tsinfo; struct rds_tcp_connection *tc; unsigned long flags; struct sockaddr_in sin; int sinlen; spin_lock_irqsave(&rds_tcp_tc_list_lock, flags); if (len / sizeof(tsinfo) < rds_tcp_tc_count) goto out; list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) { sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0); tsinfo.local_addr = sin.sin_addr.s_addr; tsinfo.local_port = sin.sin_port; sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1); tsinfo.peer_addr = sin.sin_addr.s_addr; tsinfo.peer_port = sin.sin_port; tsinfo.hdr_rem = tc->t_tinc_hdr_rem; tsinfo.data_rem = tc->t_tinc_data_rem; tsinfo.last_sent_nxt = tc->t_last_sent_nxt; tsinfo.last_expected_una = tc->t_last_expected_una; tsinfo.last_seen_una = tc->t_last_seen_una; rds_info_copy(iter, &tsinfo, sizeof(tsinfo)); } out: lens->nr = rds_tcp_tc_count; lens->each = sizeof(tsinfo); spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags); } static int rds_tcp_laddr_check(__be32 addr) { if (inet_addr_type(&init_net, addr) == RTN_LOCAL) return 0; return -EADDRNOTAVAIL; } static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp) { struct rds_tcp_connection *tc; tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp); if (!tc) return -ENOMEM; tc->t_sock = NULL; tc->t_tinc = NULL; tc->t_tinc_hdr_rem = sizeof(struct rds_header); tc->t_tinc_data_rem = 0; conn->c_transport_data = tc; spin_lock_irq(&rds_tcp_conn_lock); list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list); spin_unlock_irq(&rds_tcp_conn_lock); rdsdebug("alloced tc %p\n", conn->c_transport_data); return 0; } static void rds_tcp_conn_free(void *arg) { struct rds_tcp_connection *tc = arg; unsigned long flags; rdsdebug("freeing tc %p\n", tc); spin_lock_irqsave(&rds_tcp_conn_lock, flags); list_del(&tc->t_tcp_node); spin_unlock_irqrestore(&rds_tcp_conn_lock, flags); kmem_cache_free(rds_tcp_conn_slab, tc); } static void rds_tcp_destroy_conns(void) { struct rds_tcp_connection *tc, *_tc; LIST_HEAD(tmp_list); /* avoid calling conn_destroy with irqs off */ spin_lock_irq(&rds_tcp_conn_lock); list_splice(&rds_tcp_conn_list, &tmp_list); INIT_LIST_HEAD(&rds_tcp_conn_list); spin_unlock_irq(&rds_tcp_conn_lock); list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { if (tc->conn->c_passive) rds_conn_destroy(tc->conn->c_passive); rds_conn_destroy(tc->conn); } } static void rds_tcp_exit(void) { rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); rds_tcp_listen_stop(); rds_tcp_destroy_conns(); rds_trans_unregister(&rds_tcp_transport); rds_tcp_recv_exit(); kmem_cache_destroy(rds_tcp_conn_slab); } module_exit(rds_tcp_exit); struct rds_transport rds_tcp_transport = { .laddr_check = rds_tcp_laddr_check, .xmit_prepare = rds_tcp_xmit_prepare, .xmit_complete = rds_tcp_xmit_complete, .xmit = rds_tcp_xmit, .recv = rds_tcp_recv, .conn_alloc = rds_tcp_conn_alloc, .conn_free = rds_tcp_conn_free, .conn_connect = rds_tcp_conn_connect, .conn_shutdown = rds_tcp_conn_shutdown, .inc_copy_to_user = rds_tcp_inc_copy_to_user, .inc_free = rds_tcp_inc_free, .stats_info_copy = rds_tcp_stats_info_copy, .exit = rds_tcp_exit, .t_owner = THIS_MODULE, .t_name = "tcp", .t_type = RDS_TRANS_TCP, .t_prefer_loopback = 1, }; static int rds_tcp_init(void) { int ret; rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection", sizeof(struct rds_tcp_connection), 0, 0, NULL); if (!rds_tcp_conn_slab) { ret = -ENOMEM; goto out; } ret = rds_tcp_recv_init(); if (ret) goto out_slab; ret = rds_trans_register(&rds_tcp_transport); if (ret) goto out_recv; ret = rds_tcp_listen_init(); if (ret) goto out_register; rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); goto out; out_register: rds_trans_unregister(&rds_tcp_transport); out_recv: rds_tcp_recv_exit(); out_slab: kmem_cache_destroy(rds_tcp_conn_slab); out: return ret; } module_init(rds_tcp_init); MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); MODULE_DESCRIPTION("RDS: TCP transport"); MODULE_LICENSE("Dual BSD/GPL");