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> 34 #include <linux/slab.h> 35 #include <linux/in.h> 36 #include <net/tcp.h> 37 38 #include "rds.h" 39 #include "tcp.h" 40 41 /* only for info exporting */ 42 static DEFINE_SPINLOCK(rds_tcp_tc_list_lock); 43 static LIST_HEAD(rds_tcp_tc_list); 44 static unsigned int rds_tcp_tc_count; 45 46 /* Track rds_tcp_connection structs so they can be cleaned up */ 47 static DEFINE_SPINLOCK(rds_tcp_conn_lock); 48 static LIST_HEAD(rds_tcp_conn_list); 49 50 static struct kmem_cache *rds_tcp_conn_slab; 51 52 #define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024) 53 54 /* doing it this way avoids calling tcp_sk() */ 55 void rds_tcp_nonagle(struct socket *sock) 56 { 57 mm_segment_t oldfs = get_fs(); 58 int val = 1; 59 60 set_fs(KERNEL_DS); 61 sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val, 62 sizeof(val)); 63 set_fs(oldfs); 64 } 65 66 void rds_tcp_tune(struct socket *sock) 67 { 68 struct sock *sk = sock->sk; 69 70 rds_tcp_nonagle(sock); 71 72 /* 73 * We're trying to saturate gigabit with the default, 74 * see svc_sock_setbufsize(). 75 */ 76 lock_sock(sk); 77 sk->sk_sndbuf = RDS_TCP_DEFAULT_BUFSIZE; 78 sk->sk_rcvbuf = RDS_TCP_DEFAULT_BUFSIZE; 79 sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; 80 release_sock(sk); 81 } 82 83 u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc) 84 { 85 return tcp_sk(tc->t_sock->sk)->snd_nxt; 86 } 87 88 u32 rds_tcp_snd_una(struct rds_tcp_connection *tc) 89 { 90 return tcp_sk(tc->t_sock->sk)->snd_una; 91 } 92 93 void rds_tcp_restore_callbacks(struct socket *sock, 94 struct rds_tcp_connection *tc) 95 { 96 rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc); 97 write_lock_bh(&sock->sk->sk_callback_lock); 98 99 /* done under the callback_lock to serialize with write_space */ 100 spin_lock(&rds_tcp_tc_list_lock); 101 list_del_init(&tc->t_list_item); 102 rds_tcp_tc_count--; 103 spin_unlock(&rds_tcp_tc_list_lock); 104 105 tc->t_sock = NULL; 106 107 sock->sk->sk_write_space = tc->t_orig_write_space; 108 sock->sk->sk_data_ready = tc->t_orig_data_ready; 109 sock->sk->sk_state_change = tc->t_orig_state_change; 110 sock->sk->sk_user_data = NULL; 111 112 write_unlock_bh(&sock->sk->sk_callback_lock); 113 } 114 115 /* 116 * This is the only path that sets tc->t_sock. Send and receive trust that 117 * it is set. The RDS_CONN_CONNECTED bit protects those paths from being 118 * called while it isn't set. 119 */ 120 void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn) 121 { 122 struct rds_tcp_connection *tc = conn->c_transport_data; 123 124 rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc); 125 write_lock_bh(&sock->sk->sk_callback_lock); 126 127 /* done under the callback_lock to serialize with write_space */ 128 spin_lock(&rds_tcp_tc_list_lock); 129 list_add_tail(&tc->t_list_item, &rds_tcp_tc_list); 130 rds_tcp_tc_count++; 131 spin_unlock(&rds_tcp_tc_list_lock); 132 133 /* accepted sockets need our listen data ready undone */ 134 if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready) 135 sock->sk->sk_data_ready = sock->sk->sk_user_data; 136 137 tc->t_sock = sock; 138 tc->conn = conn; 139 tc->t_orig_data_ready = sock->sk->sk_data_ready; 140 tc->t_orig_write_space = sock->sk->sk_write_space; 141 tc->t_orig_state_change = sock->sk->sk_state_change; 142 143 sock->sk->sk_user_data = conn; 144 sock->sk->sk_data_ready = rds_tcp_data_ready; 145 sock->sk->sk_write_space = rds_tcp_write_space; 146 sock->sk->sk_state_change = rds_tcp_state_change; 147 148 write_unlock_bh(&sock->sk->sk_callback_lock); 149 } 150 151 static void rds_tcp_tc_info(struct socket *sock, unsigned int len, 152 struct rds_info_iterator *iter, 153 struct rds_info_lengths *lens) 154 { 155 struct rds_info_tcp_socket tsinfo; 156 struct rds_tcp_connection *tc; 157 unsigned long flags; 158 struct sockaddr_in sin; 159 int sinlen; 160 161 spin_lock_irqsave(&rds_tcp_tc_list_lock, flags); 162 163 if (len / sizeof(tsinfo) < rds_tcp_tc_count) 164 goto out; 165 166 list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) { 167 168 sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0); 169 tsinfo.local_addr = sin.sin_addr.s_addr; 170 tsinfo.local_port = sin.sin_port; 171 sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1); 172 tsinfo.peer_addr = sin.sin_addr.s_addr; 173 tsinfo.peer_port = sin.sin_port; 174 175 tsinfo.hdr_rem = tc->t_tinc_hdr_rem; 176 tsinfo.data_rem = tc->t_tinc_data_rem; 177 tsinfo.last_sent_nxt = tc->t_last_sent_nxt; 178 tsinfo.last_expected_una = tc->t_last_expected_una; 179 tsinfo.last_seen_una = tc->t_last_seen_una; 180 181 rds_info_copy(iter, &tsinfo, sizeof(tsinfo)); 182 } 183 184 out: 185 lens->nr = rds_tcp_tc_count; 186 lens->each = sizeof(tsinfo); 187 188 spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags); 189 } 190 191 static int rds_tcp_laddr_check(__be32 addr) 192 { 193 if (inet_addr_type(&init_net, addr) == RTN_LOCAL) 194 return 0; 195 return -EADDRNOTAVAIL; 196 } 197 198 static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp) 199 { 200 struct rds_tcp_connection *tc; 201 202 tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp); 203 if (!tc) 204 return -ENOMEM; 205 206 tc->t_sock = NULL; 207 tc->t_tinc = NULL; 208 tc->t_tinc_hdr_rem = sizeof(struct rds_header); 209 tc->t_tinc_data_rem = 0; 210 211 conn->c_transport_data = tc; 212 213 spin_lock_irq(&rds_tcp_conn_lock); 214 list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list); 215 spin_unlock_irq(&rds_tcp_conn_lock); 216 217 rdsdebug("alloced tc %p\n", conn->c_transport_data); 218 return 0; 219 } 220 221 static void rds_tcp_conn_free(void *arg) 222 { 223 struct rds_tcp_connection *tc = arg; 224 rdsdebug("freeing tc %p\n", tc); 225 kmem_cache_free(rds_tcp_conn_slab, tc); 226 } 227 228 static void rds_tcp_destroy_conns(void) 229 { 230 struct rds_tcp_connection *tc, *_tc; 231 LIST_HEAD(tmp_list); 232 233 /* avoid calling conn_destroy with irqs off */ 234 spin_lock_irq(&rds_tcp_conn_lock); 235 list_splice(&rds_tcp_conn_list, &tmp_list); 236 INIT_LIST_HEAD(&rds_tcp_conn_list); 237 spin_unlock_irq(&rds_tcp_conn_lock); 238 239 list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { 240 if (tc->conn->c_passive) 241 rds_conn_destroy(tc->conn->c_passive); 242 rds_conn_destroy(tc->conn); 243 } 244 } 245 246 static void rds_tcp_exit(void) 247 { 248 rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); 249 rds_tcp_listen_stop(); 250 rds_tcp_destroy_conns(); 251 rds_trans_unregister(&rds_tcp_transport); 252 rds_tcp_recv_exit(); 253 kmem_cache_destroy(rds_tcp_conn_slab); 254 } 255 module_exit(rds_tcp_exit); 256 257 struct rds_transport rds_tcp_transport = { 258 .laddr_check = rds_tcp_laddr_check, 259 .xmit_prepare = rds_tcp_xmit_prepare, 260 .xmit_complete = rds_tcp_xmit_complete, 261 .xmit = rds_tcp_xmit, 262 .recv = rds_tcp_recv, 263 .conn_alloc = rds_tcp_conn_alloc, 264 .conn_free = rds_tcp_conn_free, 265 .conn_connect = rds_tcp_conn_connect, 266 .conn_shutdown = rds_tcp_conn_shutdown, 267 .inc_copy_to_user = rds_tcp_inc_copy_to_user, 268 .inc_free = rds_tcp_inc_free, 269 .stats_info_copy = rds_tcp_stats_info_copy, 270 .exit = rds_tcp_exit, 271 .t_owner = THIS_MODULE, 272 .t_name = "tcp", 273 .t_type = RDS_TRANS_TCP, 274 .t_prefer_loopback = 1, 275 }; 276 277 static int rds_tcp_init(void) 278 { 279 int ret; 280 281 rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection", 282 sizeof(struct rds_tcp_connection), 283 0, 0, NULL); 284 if (!rds_tcp_conn_slab) { 285 ret = -ENOMEM; 286 goto out; 287 } 288 289 ret = rds_tcp_recv_init(); 290 if (ret) 291 goto out_slab; 292 293 ret = rds_trans_register(&rds_tcp_transport); 294 if (ret) 295 goto out_recv; 296 297 ret = rds_tcp_listen_init(); 298 if (ret) 299 goto out_register; 300 301 rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); 302 303 goto out; 304 305 out_register: 306 rds_trans_unregister(&rds_tcp_transport); 307 out_recv: 308 rds_tcp_recv_exit(); 309 out_slab: 310 kmem_cache_destroy(rds_tcp_conn_slab); 311 out: 312 return ret; 313 } 314 module_init(rds_tcp_init); 315 316 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 317 MODULE_DESCRIPTION("RDS: TCP transport"); 318 MODULE_LICENSE("Dual BSD/GPL"); 319 320