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/net/rds/tcp.c

https://gitlab.com/cr3pt/nkernel
C | 326 lines | 220 code | 58 blank | 48 comment | 11 complexity | 9d27411f54d2683925b6bba2eac1b0f7 MD5 | raw file
  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. #include "rds.h"
  39. #include "tcp.h"
  40. /* only for info exporting */
  41. static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
  42. static LIST_HEAD(rds_tcp_tc_list);
  43. static unsigned int rds_tcp_tc_count;
  44. /* Track rds_tcp_connection structs so they can be cleaned up */
  45. static DEFINE_SPINLOCK(rds_tcp_conn_lock);
  46. static LIST_HEAD(rds_tcp_conn_list);
  47. static struct kmem_cache *rds_tcp_conn_slab;
  48. #define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024)
  49. /* doing it this way avoids calling tcp_sk() */
  50. void rds_tcp_nonagle(struct socket *sock)
  51. {
  52. mm_segment_t oldfs = get_fs();
  53. int val = 1;
  54. set_fs(KERNEL_DS);
  55. sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val,
  56. sizeof(val));
  57. set_fs(oldfs);
  58. }
  59. void rds_tcp_tune(struct socket *sock)
  60. {
  61. struct sock *sk = sock->sk;
  62. rds_tcp_nonagle(sock);
  63. /*
  64. * We're trying to saturate gigabit with the default,
  65. * see svc_sock_setbufsize().
  66. */
  67. lock_sock(sk);
  68. sk->sk_sndbuf = RDS_TCP_DEFAULT_BUFSIZE;
  69. sk->sk_rcvbuf = RDS_TCP_DEFAULT_BUFSIZE;
  70. sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
  71. release_sock(sk);
  72. }
  73. u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc)
  74. {
  75. return tcp_sk(tc->t_sock->sk)->snd_nxt;
  76. }
  77. u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)
  78. {
  79. return tcp_sk(tc->t_sock->sk)->snd_una;
  80. }
  81. void rds_tcp_restore_callbacks(struct socket *sock,
  82. struct rds_tcp_connection *tc)
  83. {
  84. rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc);
  85. write_lock_bh(&sock->sk->sk_callback_lock);
  86. /* done under the callback_lock to serialize with write_space */
  87. spin_lock(&rds_tcp_tc_list_lock);
  88. list_del_init(&tc->t_list_item);
  89. rds_tcp_tc_count--;
  90. spin_unlock(&rds_tcp_tc_list_lock);
  91. tc->t_sock = NULL;
  92. sock->sk->sk_write_space = tc->t_orig_write_space;
  93. sock->sk->sk_data_ready = tc->t_orig_data_ready;
  94. sock->sk->sk_state_change = tc->t_orig_state_change;
  95. sock->sk->sk_user_data = NULL;
  96. write_unlock_bh(&sock->sk->sk_callback_lock);
  97. }
  98. /*
  99. * This is the only path that sets tc->t_sock. Send and receive trust that
  100. * it is set. The RDS_CONN_CONNECTED bit protects those paths from being
  101. * called while it isn't set.
  102. */
  103. void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn)
  104. {
  105. struct rds_tcp_connection *tc = conn->c_transport_data;
  106. rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc);
  107. write_lock_bh(&sock->sk->sk_callback_lock);
  108. /* done under the callback_lock to serialize with write_space */
  109. spin_lock(&rds_tcp_tc_list_lock);
  110. list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
  111. rds_tcp_tc_count++;
  112. spin_unlock(&rds_tcp_tc_list_lock);
  113. /* accepted sockets need our listen data ready undone */
  114. if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready)
  115. sock->sk->sk_data_ready = sock->sk->sk_user_data;
  116. tc->t_sock = sock;
  117. tc->conn = conn;
  118. tc->t_orig_data_ready = sock->sk->sk_data_ready;
  119. tc->t_orig_write_space = sock->sk->sk_write_space;
  120. tc->t_orig_state_change = sock->sk->sk_state_change;
  121. sock->sk->sk_user_data = conn;
  122. sock->sk->sk_data_ready = rds_tcp_data_ready;
  123. sock->sk->sk_write_space = rds_tcp_write_space;
  124. sock->sk->sk_state_change = rds_tcp_state_change;
  125. write_unlock_bh(&sock->sk->sk_callback_lock);
  126. }
  127. static void rds_tcp_tc_info(struct socket *sock, unsigned int len,
  128. struct rds_info_iterator *iter,
  129. struct rds_info_lengths *lens)
  130. {
  131. struct rds_info_tcp_socket tsinfo;
  132. struct rds_tcp_connection *tc;
  133. unsigned long flags;
  134. struct sockaddr_in sin;
  135. int sinlen;
  136. spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
  137. if (len / sizeof(tsinfo) < rds_tcp_tc_count)
  138. goto out;
  139. list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
  140. sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0);
  141. tsinfo.local_addr = sin.sin_addr.s_addr;
  142. tsinfo.local_port = sin.sin_port;
  143. sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1);
  144. tsinfo.peer_addr = sin.sin_addr.s_addr;
  145. tsinfo.peer_port = sin.sin_port;
  146. tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
  147. tsinfo.data_rem = tc->t_tinc_data_rem;
  148. tsinfo.last_sent_nxt = tc->t_last_sent_nxt;
  149. tsinfo.last_expected_una = tc->t_last_expected_una;
  150. tsinfo.last_seen_una = tc->t_last_seen_una;
  151. rds_info_copy(iter, &tsinfo, sizeof(tsinfo));
  152. }
  153. out:
  154. lens->nr = rds_tcp_tc_count;
  155. lens->each = sizeof(tsinfo);
  156. spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
  157. }
  158. static int rds_tcp_laddr_check(__be32 addr)
  159. {
  160. if (inet_addr_type(&init_net, addr) == RTN_LOCAL)
  161. return 0;
  162. return -EADDRNOTAVAIL;
  163. }
  164. static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
  165. {
  166. struct rds_tcp_connection *tc;
  167. tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
  168. if (!tc)
  169. return -ENOMEM;
  170. tc->t_sock = NULL;
  171. tc->t_tinc = NULL;
  172. tc->t_tinc_hdr_rem = sizeof(struct rds_header);
  173. tc->t_tinc_data_rem = 0;
  174. conn->c_transport_data = tc;
  175. spin_lock_irq(&rds_tcp_conn_lock);
  176. list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
  177. spin_unlock_irq(&rds_tcp_conn_lock);
  178. rdsdebug("alloced tc %p\n", conn->c_transport_data);
  179. return 0;
  180. }
  181. static void rds_tcp_conn_free(void *arg)
  182. {
  183. struct rds_tcp_connection *tc = arg;
  184. unsigned long flags;
  185. rdsdebug("freeing tc %p\n", tc);
  186. spin_lock_irqsave(&rds_tcp_conn_lock, flags);
  187. list_del(&tc->t_tcp_node);
  188. spin_unlock_irqrestore(&rds_tcp_conn_lock, flags);
  189. kmem_cache_free(rds_tcp_conn_slab, tc);
  190. }
  191. static void rds_tcp_destroy_conns(void)
  192. {
  193. struct rds_tcp_connection *tc, *_tc;
  194. LIST_HEAD(tmp_list);
  195. /* avoid calling conn_destroy with irqs off */
  196. spin_lock_irq(&rds_tcp_conn_lock);
  197. list_splice(&rds_tcp_conn_list, &tmp_list);
  198. INIT_LIST_HEAD(&rds_tcp_conn_list);
  199. spin_unlock_irq(&rds_tcp_conn_lock);
  200. list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) {
  201. if (tc->conn->c_passive)
  202. rds_conn_destroy(tc->conn->c_passive);
  203. rds_conn_destroy(tc->conn);
  204. }
  205. }
  206. static void rds_tcp_exit(void)
  207. {
  208. rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
  209. rds_tcp_listen_stop();
  210. rds_tcp_destroy_conns();
  211. rds_trans_unregister(&rds_tcp_transport);
  212. rds_tcp_recv_exit();
  213. kmem_cache_destroy(rds_tcp_conn_slab);
  214. }
  215. module_exit(rds_tcp_exit);
  216. struct rds_transport rds_tcp_transport = {
  217. .laddr_check = rds_tcp_laddr_check,
  218. .xmit_prepare = rds_tcp_xmit_prepare,
  219. .xmit_complete = rds_tcp_xmit_complete,
  220. .xmit = rds_tcp_xmit,
  221. .recv = rds_tcp_recv,
  222. .conn_alloc = rds_tcp_conn_alloc,
  223. .conn_free = rds_tcp_conn_free,
  224. .conn_connect = rds_tcp_conn_connect,
  225. .conn_shutdown = rds_tcp_conn_shutdown,
  226. .inc_copy_to_user = rds_tcp_inc_copy_to_user,
  227. .inc_free = rds_tcp_inc_free,
  228. .stats_info_copy = rds_tcp_stats_info_copy,
  229. .exit = rds_tcp_exit,
  230. .t_owner = THIS_MODULE,
  231. .t_name = "tcp",
  232. .t_type = RDS_TRANS_TCP,
  233. .t_prefer_loopback = 1,
  234. };
  235. static int rds_tcp_init(void)
  236. {
  237. int ret;
  238. rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
  239. sizeof(struct rds_tcp_connection),
  240. 0, 0, NULL);
  241. if (!rds_tcp_conn_slab) {
  242. ret = -ENOMEM;
  243. goto out;
  244. }
  245. ret = rds_tcp_recv_init();
  246. if (ret)
  247. goto out_slab;
  248. ret = rds_trans_register(&rds_tcp_transport);
  249. if (ret)
  250. goto out_recv;
  251. ret = rds_tcp_listen_init();
  252. if (ret)
  253. goto out_register;
  254. rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
  255. goto out;
  256. out_register:
  257. rds_trans_unregister(&rds_tcp_transport);
  258. out_recv:
  259. rds_tcp_recv_exit();
  260. out_slab:
  261. kmem_cache_destroy(rds_tcp_conn_slab);
  262. out:
  263. return ret;
  264. }
  265. module_init(rds_tcp_init);
  266. MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
  267. MODULE_DESCRIPTION("RDS: TCP transport");
  268. MODULE_LICENSE("Dual BSD/GPL");