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 <linux/module.h> 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); 45 static unsigned int rds_tcp_tc_count; 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); 204 if (!tc) 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; 225 unsigned long flags; 226 rdsdebug("freeing tc %p\n", tc); 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); 231 232 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 } 252 253 static void rds_tcp_exit(void) 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, 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, 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", 280 .t_type = RDS_TRANS_TCP, 281 .t_prefer_loopback = 1, 282 }; 283 284 static int rds_tcp_init(void) 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); 291 if (!rds_tcp_conn_slab) { 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 <rds-devel@oss.oracle.com>"); 324 MODULE_DESCRIPTION("RDS: TCP transport"); 325 MODULE_LICENSE("Dual BSD/GPL"); 326 327