[linux.git] / net / rds / tcp.c

/*
 * 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 <[email protected]>");
MODULE_DESCRIPTION("RDS: TCP transport");
MODULE_LICENSE("Dual BSD/GPL");
Commit	Line	Data
70041088 AG	1	/*
	2	* Copyright (c) 2006 Oracle. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*
	32	*/
	33	#include <linux/kernel.h>
5a0e3ad6	34	#include <linux/slab.h>
70041088	35	#include <linux/in.h>
3a9a231d	36	#include <linux/module.h>
70041088 AG	37	#include <net/tcp.h>
	38
	39	#include "rds.h"
	40	#include "tcp.h"
	41
	42	/* only for info exporting */
	43	static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
	44	static LIST_HEAD(rds_tcp_tc_list);
ff51bf84	45	static unsigned int rds_tcp_tc_count;
70041088 AG	46
	47	/* Track rds_tcp_connection structs so they can be cleaned up */
	48	static DEFINE_SPINLOCK(rds_tcp_conn_lock);
	49	static LIST_HEAD(rds_tcp_conn_list);
	50
	51	static struct kmem_cache *rds_tcp_conn_slab;
	52
	53	#define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024)
	54
	55	/* doing it this way avoids calling tcp_sk() */
	56	void rds_tcp_nonagle(struct socket *sock)
	57	{
	58	mm_segment_t oldfs = get_fs();
	59	int val = 1;
	60
	61	set_fs(KERNEL_DS);
	62	sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val,
	63	sizeof(val));
	64	set_fs(oldfs);
	65	}
	66
	67	void rds_tcp_tune(struct socket *sock)
	68	{
	69	struct sock *sk = sock->sk;
	70
	71	rds_tcp_nonagle(sock);
	72
	73	/*
	74	* We're trying to saturate gigabit with the default,
	75	* see svc_sock_setbufsize().
	76	*/
	77	lock_sock(sk);
	78	sk->sk_sndbuf = RDS_TCP_DEFAULT_BUFSIZE;
	79	sk->sk_rcvbuf = RDS_TCP_DEFAULT_BUFSIZE;
	80	sk->sk_userlocks \|= SOCK_SNDBUF_LOCK\|SOCK_RCVBUF_LOCK;
	81	release_sock(sk);
	82	}
	83
	84	u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc)
	85	{
	86	return tcp_sk(tc->t_sock->sk)->snd_nxt;
	87	}
	88
	89	u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)
	90	{
	91	return tcp_sk(tc->t_sock->sk)->snd_una;
	92	}
	93
	94	void rds_tcp_restore_callbacks(struct socket *sock,
	95	struct rds_tcp_connection *tc)
	96	{
	97	rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc);
	98	write_lock_bh(&sock->sk->sk_callback_lock);
	99
	100	/* done under the callback_lock to serialize with write_space */
	101	spin_lock(&rds_tcp_tc_list_lock);
	102	list_del_init(&tc->t_list_item);
	103	rds_tcp_tc_count--;
	104	spin_unlock(&rds_tcp_tc_list_lock);
	105
	106	tc->t_sock = NULL;
	107
	108	sock->sk->sk_write_space = tc->t_orig_write_space;
	109	sock->sk->sk_data_ready = tc->t_orig_data_ready;
110	sock->sk->sk_state_change = tc->t_orig_state_change;
111	sock->sk->sk_user_data = NULL;
112
113	write_unlock_bh(&sock->sk->sk_callback_lock);
114	}
115
116	/*
117	* This is the only path that sets tc->t_sock. Send and receive trust that
118	* it is set. The RDS_CONN_CONNECTED bit protects those paths from being
119	* called while it isn't set.
120	*/
121	void rds_tcp_set_callbacks(struct socket sock, struct rds_connection conn)
122	{
123	struct rds_tcp_connection *tc = conn->c_transport_data;
124
125	rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc);
126	write_lock_bh(&sock->sk->sk_callback_lock);
127
128	/* done under the callback_lock to serialize with write_space */
129	spin_lock(&rds_tcp_tc_list_lock);
130	list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
131	rds_tcp_tc_count++;
132	spin_unlock(&rds_tcp_tc_list_lock);
133
134	/* accepted sockets need our listen data ready undone */
135	if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready)
136	sock->sk->sk_data_ready = sock->sk->sk_user_data;
137
138	tc->t_sock = sock;
139	tc->conn = conn;
140	tc->t_orig_data_ready = sock->sk->sk_data_ready;
141	tc->t_orig_write_space = sock->sk->sk_write_space;
142	tc->t_orig_state_change = sock->sk->sk_state_change;
143
144	sock->sk->sk_user_data = conn;
145	sock->sk->sk_data_ready = rds_tcp_data_ready;
146	sock->sk->sk_write_space = rds_tcp_write_space;
147	sock->sk->sk_state_change = rds_tcp_state_change;
148
149	write_unlock_bh(&sock->sk->sk_callback_lock);
150	}
151
152	static void rds_tcp_tc_info(struct socket *sock, unsigned int len,
153	struct rds_info_iterator *iter,
154	struct rds_info_lengths *lens)
155	{
156	struct rds_info_tcp_socket tsinfo;
157	struct rds_tcp_connection *tc;
158	unsigned long flags;
159	struct sockaddr_in sin;
160	int sinlen;
161
162	spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
163
164	if (len / sizeof(tsinfo) < rds_tcp_tc_count)
165	goto out;
166
167	list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
168
169	sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0);
170	tsinfo.local_addr = sin.sin_addr.s_addr;
171	tsinfo.local_port = sin.sin_port;
172	sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1);
173	tsinfo.peer_addr = sin.sin_addr.s_addr;
174	tsinfo.peer_port = sin.sin_port;
175
176	tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
177	tsinfo.data_rem = tc->t_tinc_data_rem;
178	tsinfo.last_sent_nxt = tc->t_last_sent_nxt;
179	tsinfo.last_expected_una = tc->t_last_expected_una;
180	tsinfo.last_seen_una = tc->t_last_seen_una;
181
182	rds_info_copy(iter, &tsinfo, sizeof(tsinfo));
183	}
184
185	out:
186	lens->nr = rds_tcp_tc_count;
187	lens->each = sizeof(tsinfo);
188
189	spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
190	}
191
192	static int rds_tcp_laddr_check(__be32 addr)
193	{
194	if (inet_addr_type(&init_net, addr) == RTN_LOCAL)
195	return 0;
196	return -EADDRNOTAVAIL;
197	}
198
199	static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
200	{
201	struct rds_tcp_connection *tc;
202
203	tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
8690bfa1	204	if (!tc)
70041088 AG	205	return -ENOMEM;
	206
	207	tc->t_sock = NULL;
	208	tc->t_tinc = NULL;
	209	tc->t_tinc_hdr_rem = sizeof(struct rds_header);
	210	tc->t_tinc_data_rem = 0;
	211
	212	conn->c_transport_data = tc;
	213
	214	spin_lock_irq(&rds_tcp_conn_lock);
	215	list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
	216	spin_unlock_irq(&rds_tcp_conn_lock);
	217
	218	rdsdebug("alloced tc %p\n", conn->c_transport_data);
	219	return 0;
	220	}
	221
	222	static void rds_tcp_conn_free(void *arg)
	223	{
	224	struct rds_tcp_connection *tc = arg;
8200a59f	225	unsigned long flags;
70041088	226	rdsdebug("freeing tc %p\n", tc);
8200a59f PE	227
	228	spin_lock_irqsave(&rds_tcp_conn_lock, flags);
	229	list_del(&tc->t_tcp_node);
	230	spin_unlock_irqrestore(&rds_tcp_conn_lock, flags);
	231
70041088 AG	232	kmem_cache_free(rds_tcp_conn_slab, tc);
	233	}
	234
	235	static void rds_tcp_destroy_conns(void)
	236	{
	237	struct rds_tcp_connection tc, _tc;
	238	LIST_HEAD(tmp_list);
	239
	240	/* avoid calling conn_destroy with irqs off */
	241	spin_lock_irq(&rds_tcp_conn_lock);
	242	list_splice(&rds_tcp_conn_list, &tmp_list);
	243	INIT_LIST_HEAD(&rds_tcp_conn_list);
	244	spin_unlock_irq(&rds_tcp_conn_lock);
	245
	246	list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) {
	247	if (tc->conn->c_passive)
	248	rds_conn_destroy(tc->conn->c_passive);
	249	rds_conn_destroy(tc->conn);
	250	}
	251	}
	252
ff51bf84	253	static void rds_tcp_exit(void)
70041088 AG	254	{
	255	rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
	256	rds_tcp_listen_stop();
	257	rds_tcp_destroy_conns();
	258	rds_trans_unregister(&rds_tcp_transport);
	259	rds_tcp_recv_exit();
	260	kmem_cache_destroy(rds_tcp_conn_slab);
	261	}
	262	module_exit(rds_tcp_exit);
	263
	264	struct rds_transport rds_tcp_transport = {
	265	.laddr_check = rds_tcp_laddr_check,
	266	.xmit_prepare = rds_tcp_xmit_prepare,
	267	.xmit_complete = rds_tcp_xmit_complete,
70041088 AG	268	.xmit = rds_tcp_xmit,
	269	.recv = rds_tcp_recv,
	270	.conn_alloc = rds_tcp_conn_alloc,
	271	.conn_free = rds_tcp_conn_free,
	272	.conn_connect = rds_tcp_conn_connect,
	273	.conn_shutdown = rds_tcp_conn_shutdown,
	274	.inc_copy_to_user = rds_tcp_inc_copy_to_user,
70041088 AG	275	.inc_free = rds_tcp_inc_free,
	276	.stats_info_copy = rds_tcp_stats_info_copy,
	277	.exit = rds_tcp_exit,
	278	.t_owner = THIS_MODULE,
	279	.t_name = "tcp",
335776bd	280	.t_type = RDS_TRANS_TCP,
70041088 AG	281	.t_prefer_loopback = 1,
	282	};
	283
ff51bf84	284	static int rds_tcp_init(void)
70041088 AG	285	{
	286	int ret;
	287
	288	rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
	289	sizeof(struct rds_tcp_connection),
	290	0, 0, NULL);
8690bfa1	291	if (!rds_tcp_conn_slab) {
70041088 AG	292	ret = -ENOMEM;
	293	goto out;
	294	}
	295
	296	ret = rds_tcp_recv_init();
	297	if (ret)
	298	goto out_slab;
	299
	300	ret = rds_trans_register(&rds_tcp_transport);
	301	if (ret)
	302	goto out_recv;
	303
	304	ret = rds_tcp_listen_init();
	305	if (ret)
	306	goto out_register;
	307
	308	rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
	309
	310	goto out;
	311
	312	out_register:
	313	rds_trans_unregister(&rds_tcp_transport);
	314	out_recv:
	315	rds_tcp_recv_exit();
	316	out_slab:
	317	kmem_cache_destroy(rds_tcp_conn_slab);
	318	out:
	319	return ret;
	320	}
	321	module_init(rds_tcp_init);
	322
	323	MODULE_AUTHOR("Oracle Corporation <[email protected]>");
	324	MODULE_DESCRIPTION("RDS: TCP transport");
	325	MODULE_LICENSE("Dual BSD/GPL");
	326