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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 | 37 | #include <net/tcp.h> |
467fa153 SV |
38 | #include <net/net_namespace.h> |
39 | #include <net/netns/generic.h> | |
70041088 AG |
40 | |
41 | #include "rds.h" | |
42 | #include "tcp.h" | |
43 | ||
44 | /* only for info exporting */ | |
45 | static DEFINE_SPINLOCK(rds_tcp_tc_list_lock); | |
46 | static LIST_HEAD(rds_tcp_tc_list); | |
ff51bf84 | 47 | static unsigned int rds_tcp_tc_count; |
70041088 AG |
48 | |
49 | /* Track rds_tcp_connection structs so they can be cleaned up */ | |
50 | static DEFINE_SPINLOCK(rds_tcp_conn_lock); | |
51 | static LIST_HEAD(rds_tcp_conn_list); | |
52 | ||
53 | static struct kmem_cache *rds_tcp_conn_slab; | |
54 | ||
c6a58ffe SV |
55 | static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write, |
56 | void __user *buffer, size_t *lenp, | |
57 | loff_t *fpos); | |
58 | ||
af73e72d WY |
59 | static int rds_tcp_min_sndbuf = SOCK_MIN_SNDBUF; |
60 | static int rds_tcp_min_rcvbuf = SOCK_MIN_RCVBUF; | |
c6a58ffe SV |
61 | |
62 | static struct ctl_table rds_tcp_sysctl_table[] = { | |
63 | #define RDS_TCP_SNDBUF 0 | |
64 | { | |
65 | .procname = "rds_tcp_sndbuf", | |
66 | /* data is per-net pointer */ | |
67 | .maxlen = sizeof(int), | |
68 | .mode = 0644, | |
69 | .proc_handler = rds_tcp_skbuf_handler, | |
70 | .extra1 = &rds_tcp_min_sndbuf, | |
71 | }, | |
72 | #define RDS_TCP_RCVBUF 1 | |
73 | { | |
74 | .procname = "rds_tcp_rcvbuf", | |
75 | /* data is per-net pointer */ | |
76 | .maxlen = sizeof(int), | |
77 | .mode = 0644, | |
78 | .proc_handler = rds_tcp_skbuf_handler, | |
79 | .extra1 = &rds_tcp_min_rcvbuf, | |
80 | }, | |
81 | { } | |
82 | }; | |
83 | ||
70041088 AG |
84 | /* doing it this way avoids calling tcp_sk() */ |
85 | void rds_tcp_nonagle(struct socket *sock) | |
86 | { | |
70041088 AG |
87 | int val = 1; |
88 | ||
e73a67f7 | 89 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (void *)&val, |
70041088 | 90 | sizeof(val)); |
70041088 AG |
91 | } |
92 | ||
b589513e | 93 | u32 rds_tcp_write_seq(struct rds_tcp_connection *tc) |
70041088 | 94 | { |
b589513e SV |
95 | /* seq# of the last byte of data in tcp send buffer */ |
96 | return tcp_sk(tc->t_sock->sk)->write_seq; | |
70041088 AG |
97 | } |
98 | ||
99 | u32 rds_tcp_snd_una(struct rds_tcp_connection *tc) | |
100 | { | |
101 | return tcp_sk(tc->t_sock->sk)->snd_una; | |
102 | } | |
103 | ||
104 | void rds_tcp_restore_callbacks(struct socket *sock, | |
105 | struct rds_tcp_connection *tc) | |
106 | { | |
107 | rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc); | |
108 | write_lock_bh(&sock->sk->sk_callback_lock); | |
109 | ||
110 | /* done under the callback_lock to serialize with write_space */ | |
111 | spin_lock(&rds_tcp_tc_list_lock); | |
112 | list_del_init(&tc->t_list_item); | |
113 | rds_tcp_tc_count--; | |
114 | spin_unlock(&rds_tcp_tc_list_lock); | |
115 | ||
116 | tc->t_sock = NULL; | |
117 | ||
118 | sock->sk->sk_write_space = tc->t_orig_write_space; | |
119 | sock->sk->sk_data_ready = tc->t_orig_data_ready; | |
120 | sock->sk->sk_state_change = tc->t_orig_state_change; | |
121 | sock->sk->sk_user_data = NULL; | |
122 | ||
123 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
124 | } | |
125 | ||
126 | /* | |
335b48d9 SV |
127 | * rds_tcp_reset_callbacks() switches the to the new sock and |
128 | * returns the existing tc->t_sock. | |
129 | * | |
130 | * The only functions that set tc->t_sock are rds_tcp_set_callbacks | |
131 | * and rds_tcp_reset_callbacks. Send and receive trust that | |
132 | * it is set. The absence of RDS_CONN_UP bit protects those paths | |
133 | * from being called while it isn't set. | |
134 | */ | |
135 | void rds_tcp_reset_callbacks(struct socket *sock, | |
ea3b1ea5 | 136 | struct rds_conn_path *cp) |
335b48d9 | 137 | { |
ea3b1ea5 | 138 | struct rds_tcp_connection *tc = cp->cp_transport_data; |
335b48d9 SV |
139 | struct socket *osock = tc->t_sock; |
140 | ||
141 | if (!osock) | |
142 | goto newsock; | |
143 | ||
144 | /* Need to resolve a duelling SYN between peers. | |
145 | * We have an outstanding SYN to this peer, which may | |
146 | * potentially have transitioned to the RDS_CONN_UP state, | |
147 | * so we must quiesce any send threads before resetting | |
ea3b1ea5 SV |
148 | * cp_transport_data. We quiesce these threads by setting |
149 | * cp_state to something other than RDS_CONN_UP, and then | |
335b48d9 SV |
150 | * waiting for any existing threads in rds_send_xmit to |
151 | * complete release_in_xmit(). (Subsequent threads entering | |
152 | * rds_send_xmit() will bail on !rds_conn_up(). | |
9c79440e SV |
153 | * |
154 | * However an incoming syn-ack at this point would end up | |
155 | * marking the conn as RDS_CONN_UP, and would again permit | |
156 | * rds_send_xmi() threads through, so ideally we would | |
157 | * synchronize on RDS_CONN_UP after lock_sock(), but cannot | |
158 | * do that: waiting on !RDS_IN_XMIT after lock_sock() may | |
159 | * end up deadlocking with tcp_sendmsg(), and the RDS_IN_XMIT | |
160 | * would not get set. As a result, we set c_state to | |
161 | * RDS_CONN_RESETTTING, to ensure that rds_tcp_state_change | |
162 | * cannot mark rds_conn_path_up() in the window before lock_sock() | |
335b48d9 | 163 | */ |
ea3b1ea5 SV |
164 | atomic_set(&cp->cp_state, RDS_CONN_RESETTING); |
165 | wait_event(cp->cp_waitq, !test_bit(RDS_IN_XMIT, &cp->cp_flags)); | |
335b48d9 SV |
166 | lock_sock(osock->sk); |
167 | /* reset receive side state for rds_tcp_data_recv() for osock */ | |
ac3615e7 SV |
168 | cancel_delayed_work_sync(&cp->cp_send_w); |
169 | cancel_delayed_work_sync(&cp->cp_recv_w); | |
335b48d9 SV |
170 | if (tc->t_tinc) { |
171 | rds_inc_put(&tc->t_tinc->ti_inc); | |
172 | tc->t_tinc = NULL; | |
173 | } | |
174 | tc->t_tinc_hdr_rem = sizeof(struct rds_header); | |
175 | tc->t_tinc_data_rem = 0; | |
ac3615e7 | 176 | rds_tcp_restore_callbacks(osock, tc); |
335b48d9 SV |
177 | release_sock(osock->sk); |
178 | sock_release(osock); | |
179 | newsock: | |
ea3b1ea5 | 180 | rds_send_path_reset(cp); |
335b48d9 | 181 | lock_sock(sock->sk); |
ac3615e7 | 182 | rds_tcp_set_callbacks(sock, cp); |
335b48d9 SV |
183 | release_sock(sock->sk); |
184 | } | |
185 | ||
186 | /* Add tc to rds_tcp_tc_list and set tc->t_sock. See comments | |
187 | * above rds_tcp_reset_callbacks for notes about synchronization | |
188 | * with data path | |
70041088 | 189 | */ |
ea3b1ea5 | 190 | void rds_tcp_set_callbacks(struct socket *sock, struct rds_conn_path *cp) |
70041088 | 191 | { |
ea3b1ea5 | 192 | struct rds_tcp_connection *tc = cp->cp_transport_data; |
70041088 AG |
193 | |
194 | rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc); | |
195 | write_lock_bh(&sock->sk->sk_callback_lock); | |
196 | ||
197 | /* done under the callback_lock to serialize with write_space */ | |
198 | spin_lock(&rds_tcp_tc_list_lock); | |
199 | list_add_tail(&tc->t_list_item, &rds_tcp_tc_list); | |
200 | rds_tcp_tc_count++; | |
201 | spin_unlock(&rds_tcp_tc_list_lock); | |
202 | ||
203 | /* accepted sockets need our listen data ready undone */ | |
204 | if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready) | |
205 | sock->sk->sk_data_ready = sock->sk->sk_user_data; | |
206 | ||
207 | tc->t_sock = sock; | |
ea3b1ea5 | 208 | tc->t_cpath = cp; |
70041088 AG |
209 | tc->t_orig_data_ready = sock->sk->sk_data_ready; |
210 | tc->t_orig_write_space = sock->sk->sk_write_space; | |
211 | tc->t_orig_state_change = sock->sk->sk_state_change; | |
212 | ||
ea3b1ea5 | 213 | sock->sk->sk_user_data = cp; |
70041088 AG |
214 | sock->sk->sk_data_ready = rds_tcp_data_ready; |
215 | sock->sk->sk_write_space = rds_tcp_write_space; | |
216 | sock->sk->sk_state_change = rds_tcp_state_change; | |
217 | ||
218 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
219 | } | |
220 | ||
1ac507d4 | 221 | static void rds_tcp_tc_info(struct socket *rds_sock, unsigned int len, |
70041088 AG |
222 | struct rds_info_iterator *iter, |
223 | struct rds_info_lengths *lens) | |
224 | { | |
225 | struct rds_info_tcp_socket tsinfo; | |
226 | struct rds_tcp_connection *tc; | |
227 | unsigned long flags; | |
228 | struct sockaddr_in sin; | |
229 | int sinlen; | |
1ac507d4 | 230 | struct socket *sock; |
70041088 AG |
231 | |
232 | spin_lock_irqsave(&rds_tcp_tc_list_lock, flags); | |
233 | ||
234 | if (len / sizeof(tsinfo) < rds_tcp_tc_count) | |
235 | goto out; | |
236 | ||
237 | list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) { | |
238 | ||
1ac507d4 SV |
239 | sock = tc->t_sock; |
240 | if (sock) { | |
241 | sock->ops->getname(sock, (struct sockaddr *)&sin, | |
242 | &sinlen, 0); | |
243 | tsinfo.local_addr = sin.sin_addr.s_addr; | |
244 | tsinfo.local_port = sin.sin_port; | |
245 | sock->ops->getname(sock, (struct sockaddr *)&sin, | |
246 | &sinlen, 1); | |
247 | tsinfo.peer_addr = sin.sin_addr.s_addr; | |
248 | tsinfo.peer_port = sin.sin_port; | |
249 | } | |
70041088 AG |
250 | |
251 | tsinfo.hdr_rem = tc->t_tinc_hdr_rem; | |
252 | tsinfo.data_rem = tc->t_tinc_data_rem; | |
253 | tsinfo.last_sent_nxt = tc->t_last_sent_nxt; | |
254 | tsinfo.last_expected_una = tc->t_last_expected_una; | |
255 | tsinfo.last_seen_una = tc->t_last_seen_una; | |
256 | ||
257 | rds_info_copy(iter, &tsinfo, sizeof(tsinfo)); | |
258 | } | |
259 | ||
260 | out: | |
261 | lens->nr = rds_tcp_tc_count; | |
262 | lens->each = sizeof(tsinfo); | |
263 | ||
264 | spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags); | |
265 | } | |
266 | ||
d5a8ac28 | 267 | static int rds_tcp_laddr_check(struct net *net, __be32 addr) |
70041088 | 268 | { |
d5a8ac28 | 269 | if (inet_addr_type(net, addr) == RTN_LOCAL) |
70041088 AG |
270 | return 0; |
271 | return -EADDRNOTAVAIL; | |
272 | } | |
273 | ||
274 | static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp) | |
275 | { | |
276 | struct rds_tcp_connection *tc; | |
02105b2c | 277 | int i; |
70041088 | 278 | |
02105b2c SV |
279 | for (i = 0; i < RDS_MPATH_WORKERS; i++) { |
280 | tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp); | |
281 | if (!tc) | |
282 | return -ENOMEM; | |
70041088 | 283 | |
02105b2c SV |
284 | mutex_init(&tc->t_conn_path_lock); |
285 | tc->t_sock = NULL; | |
286 | tc->t_tinc = NULL; | |
287 | tc->t_tinc_hdr_rem = sizeof(struct rds_header); | |
288 | tc->t_tinc_data_rem = 0; | |
70041088 | 289 | |
02105b2c SV |
290 | conn->c_path[i].cp_transport_data = tc; |
291 | tc->t_cpath = &conn->c_path[i]; | |
70041088 | 292 | |
02105b2c SV |
293 | spin_lock_irq(&rds_tcp_conn_lock); |
294 | list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list); | |
295 | spin_unlock_irq(&rds_tcp_conn_lock); | |
296 | rdsdebug("rds_conn_path [%d] tc %p\n", i, | |
297 | conn->c_path[i].cp_transport_data); | |
298 | } | |
70041088 | 299 | |
70041088 AG |
300 | return 0; |
301 | } | |
302 | ||
303 | static void rds_tcp_conn_free(void *arg) | |
304 | { | |
305 | struct rds_tcp_connection *tc = arg; | |
8200a59f | 306 | unsigned long flags; |
70041088 | 307 | rdsdebug("freeing tc %p\n", tc); |
8200a59f PE |
308 | |
309 | spin_lock_irqsave(&rds_tcp_conn_lock, flags); | |
310 | list_del(&tc->t_tcp_node); | |
311 | spin_unlock_irqrestore(&rds_tcp_conn_lock, flags); | |
312 | ||
70041088 AG |
313 | kmem_cache_free(rds_tcp_conn_slab, tc); |
314 | } | |
315 | ||
afb4164d SV |
316 | static bool list_has_conn(struct list_head *list, struct rds_connection *conn) |
317 | { | |
318 | struct rds_tcp_connection *tc, *_tc; | |
319 | ||
320 | list_for_each_entry_safe(tc, _tc, list, t_tcp_node) { | |
321 | if (tc->t_cpath->cp_conn == conn) | |
322 | return true; | |
323 | } | |
324 | return false; | |
325 | } | |
326 | ||
70041088 AG |
327 | static void rds_tcp_destroy_conns(void) |
328 | { | |
329 | struct rds_tcp_connection *tc, *_tc; | |
330 | LIST_HEAD(tmp_list); | |
331 | ||
332 | /* avoid calling conn_destroy with irqs off */ | |
333 | spin_lock_irq(&rds_tcp_conn_lock); | |
afb4164d SV |
334 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { |
335 | if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn)) | |
336 | list_move_tail(&tc->t_tcp_node, &tmp_list); | |
337 | } | |
70041088 AG |
338 | spin_unlock_irq(&rds_tcp_conn_lock); |
339 | ||
26e4e6bb | 340 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) |
02105b2c | 341 | rds_conn_destroy(tc->t_cpath->cp_conn); |
70041088 AG |
342 | } |
343 | ||
467fa153 | 344 | static void rds_tcp_exit(void); |
70041088 AG |
345 | |
346 | struct rds_transport rds_tcp_transport = { | |
347 | .laddr_check = rds_tcp_laddr_check, | |
226f7a7d SV |
348 | .xmit_path_prepare = rds_tcp_xmit_path_prepare, |
349 | .xmit_path_complete = rds_tcp_xmit_path_complete, | |
70041088 | 350 | .xmit = rds_tcp_xmit, |
2da43c4a | 351 | .recv_path = rds_tcp_recv_path, |
70041088 AG |
352 | .conn_alloc = rds_tcp_conn_alloc, |
353 | .conn_free = rds_tcp_conn_free, | |
b04e8554 | 354 | .conn_path_connect = rds_tcp_conn_path_connect, |
226f7a7d | 355 | .conn_path_shutdown = rds_tcp_conn_path_shutdown, |
70041088 | 356 | .inc_copy_to_user = rds_tcp_inc_copy_to_user, |
70041088 AG |
357 | .inc_free = rds_tcp_inc_free, |
358 | .stats_info_copy = rds_tcp_stats_info_copy, | |
359 | .exit = rds_tcp_exit, | |
360 | .t_owner = THIS_MODULE, | |
361 | .t_name = "tcp", | |
335776bd | 362 | .t_type = RDS_TRANS_TCP, |
70041088 | 363 | .t_prefer_loopback = 1, |
5916e2c1 | 364 | .t_mp_capable = 1, |
70041088 AG |
365 | }; |
366 | ||
c7d03a00 | 367 | static unsigned int rds_tcp_netid; |
467fa153 SV |
368 | |
369 | /* per-network namespace private data for this module */ | |
370 | struct rds_tcp_net { | |
371 | struct socket *rds_tcp_listen_sock; | |
372 | struct work_struct rds_tcp_accept_w; | |
c6a58ffe SV |
373 | struct ctl_table_header *rds_tcp_sysctl; |
374 | struct ctl_table *ctl_table; | |
375 | int sndbuf_size; | |
376 | int rcvbuf_size; | |
467fa153 SV |
377 | }; |
378 | ||
c6a58ffe SV |
379 | /* All module specific customizations to the RDS-TCP socket should be done in |
380 | * rds_tcp_tune() and applied after socket creation. | |
381 | */ | |
382 | void rds_tcp_tune(struct socket *sock) | |
383 | { | |
384 | struct sock *sk = sock->sk; | |
385 | struct net *net = sock_net(sk); | |
386 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
387 | ||
388 | rds_tcp_nonagle(sock); | |
389 | lock_sock(sk); | |
390 | if (rtn->sndbuf_size > 0) { | |
391 | sk->sk_sndbuf = rtn->sndbuf_size; | |
392 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
393 | } | |
394 | if (rtn->rcvbuf_size > 0) { | |
395 | sk->sk_sndbuf = rtn->rcvbuf_size; | |
396 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
397 | } | |
398 | release_sock(sk); | |
399 | } | |
400 | ||
467fa153 SV |
401 | static void rds_tcp_accept_worker(struct work_struct *work) |
402 | { | |
403 | struct rds_tcp_net *rtn = container_of(work, | |
404 | struct rds_tcp_net, | |
405 | rds_tcp_accept_w); | |
406 | ||
407 | while (rds_tcp_accept_one(rtn->rds_tcp_listen_sock) == 0) | |
408 | cond_resched(); | |
409 | } | |
410 | ||
411 | void rds_tcp_accept_work(struct sock *sk) | |
412 | { | |
413 | struct net *net = sock_net(sk); | |
414 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
415 | ||
416 | queue_work(rds_wq, &rtn->rds_tcp_accept_w); | |
417 | } | |
418 | ||
419 | static __net_init int rds_tcp_init_net(struct net *net) | |
420 | { | |
421 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
c6a58ffe SV |
422 | struct ctl_table *tbl; |
423 | int err = 0; | |
467fa153 | 424 | |
c6a58ffe SV |
425 | memset(rtn, 0, sizeof(*rtn)); |
426 | ||
427 | /* {snd, rcv}buf_size default to 0, which implies we let the | |
428 | * stack pick the value, and permit auto-tuning of buffer size. | |
429 | */ | |
430 | if (net == &init_net) { | |
431 | tbl = rds_tcp_sysctl_table; | |
432 | } else { | |
433 | tbl = kmemdup(rds_tcp_sysctl_table, | |
434 | sizeof(rds_tcp_sysctl_table), GFP_KERNEL); | |
435 | if (!tbl) { | |
436 | pr_warn("could not set allocate syctl table\n"); | |
437 | return -ENOMEM; | |
438 | } | |
439 | rtn->ctl_table = tbl; | |
440 | } | |
441 | tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size; | |
442 | tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size; | |
443 | rtn->rds_tcp_sysctl = register_net_sysctl(net, "net/rds/tcp", tbl); | |
444 | if (!rtn->rds_tcp_sysctl) { | |
445 | pr_warn("could not register sysctl\n"); | |
446 | err = -ENOMEM; | |
447 | goto fail; | |
448 | } | |
467fa153 SV |
449 | rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net); |
450 | if (!rtn->rds_tcp_listen_sock) { | |
451 | pr_warn("could not set up listen sock\n"); | |
c6a58ffe SV |
452 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); |
453 | rtn->rds_tcp_sysctl = NULL; | |
454 | err = -EAFNOSUPPORT; | |
455 | goto fail; | |
467fa153 SV |
456 | } |
457 | INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker); | |
458 | return 0; | |
c6a58ffe SV |
459 | |
460 | fail: | |
461 | if (net != &init_net) | |
462 | kfree(tbl); | |
463 | return err; | |
467fa153 SV |
464 | } |
465 | ||
466 | static void __net_exit rds_tcp_exit_net(struct net *net) | |
467 | { | |
468 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
469 | ||
c6a58ffe SV |
470 | if (rtn->rds_tcp_sysctl) |
471 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); | |
472 | ||
473 | if (net != &init_net && rtn->ctl_table) | |
474 | kfree(rtn->ctl_table); | |
475 | ||
467fa153 SV |
476 | /* If rds_tcp_exit_net() is called as a result of netns deletion, |
477 | * the rds_tcp_kill_sock() device notifier would already have cleaned | |
478 | * up the listen socket, thus there is no work to do in this function. | |
479 | * | |
480 | * If rds_tcp_exit_net() is called as a result of module unload, | |
481 | * i.e., due to rds_tcp_exit() -> unregister_pernet_subsys(), then | |
482 | * we do need to clean up the listen socket here. | |
483 | */ | |
484 | if (rtn->rds_tcp_listen_sock) { | |
b21dd450 SV |
485 | struct socket *lsock = rtn->rds_tcp_listen_sock; |
486 | ||
467fa153 | 487 | rtn->rds_tcp_listen_sock = NULL; |
b21dd450 | 488 | rds_tcp_listen_stop(lsock, &rtn->rds_tcp_accept_w); |
467fa153 SV |
489 | } |
490 | } | |
491 | ||
492 | static struct pernet_operations rds_tcp_net_ops = { | |
493 | .init = rds_tcp_init_net, | |
494 | .exit = rds_tcp_exit_net, | |
495 | .id = &rds_tcp_netid, | |
496 | .size = sizeof(struct rds_tcp_net), | |
497 | }; | |
498 | ||
afb4164d SV |
499 | /* explicitly send a RST on each socket, thereby releasing any socket refcnts |
500 | * that may otherwise hold up netns deletion. | |
501 | */ | |
502 | static void rds_tcp_conn_paths_destroy(struct rds_connection *conn) | |
503 | { | |
504 | struct rds_conn_path *cp; | |
505 | struct rds_tcp_connection *tc; | |
506 | int i; | |
507 | struct sock *sk; | |
508 | ||
509 | for (i = 0; i < RDS_MPATH_WORKERS; i++) { | |
510 | cp = &conn->c_path[i]; | |
511 | tc = cp->cp_transport_data; | |
512 | if (!tc->t_sock) | |
513 | continue; | |
514 | sk = tc->t_sock->sk; | |
515 | sk->sk_prot->disconnect(sk, 0); | |
516 | tcp_done(sk); | |
517 | } | |
518 | } | |
519 | ||
467fa153 SV |
520 | static void rds_tcp_kill_sock(struct net *net) |
521 | { | |
522 | struct rds_tcp_connection *tc, *_tc; | |
467fa153 SV |
523 | LIST_HEAD(tmp_list); |
524 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
b21dd450 | 525 | struct socket *lsock = rtn->rds_tcp_listen_sock; |
467fa153 | 526 | |
467fa153 | 527 | rtn->rds_tcp_listen_sock = NULL; |
b21dd450 | 528 | rds_tcp_listen_stop(lsock, &rtn->rds_tcp_accept_w); |
467fa153 SV |
529 | spin_lock_irq(&rds_tcp_conn_lock); |
530 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { | |
8edc3aff | 531 | struct net *c_net = tc->t_cpath->cp_conn->c_net; |
467fa153 SV |
532 | |
533 | if (net != c_net || !tc->t_sock) | |
534 | continue; | |
afb4164d SV |
535 | if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn)) |
536 | list_move_tail(&tc->t_tcp_node, &tmp_list); | |
467fa153 SV |
537 | } |
538 | spin_unlock_irq(&rds_tcp_conn_lock); | |
539 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { | |
afb4164d | 540 | rds_tcp_conn_paths_destroy(tc->t_cpath->cp_conn); |
02105b2c | 541 | rds_conn_destroy(tc->t_cpath->cp_conn); |
467fa153 SV |
542 | } |
543 | } | |
544 | ||
a93d01f5 SV |
545 | void *rds_tcp_listen_sock_def_readable(struct net *net) |
546 | { | |
547 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
b21dd450 SV |
548 | struct socket *lsock = rtn->rds_tcp_listen_sock; |
549 | ||
550 | if (!lsock) | |
551 | return NULL; | |
a93d01f5 | 552 | |
b21dd450 | 553 | return lsock->sk->sk_user_data; |
a93d01f5 SV |
554 | } |
555 | ||
467fa153 SV |
556 | static int rds_tcp_dev_event(struct notifier_block *this, |
557 | unsigned long event, void *ptr) | |
558 | { | |
559 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
560 | ||
561 | /* rds-tcp registers as a pernet subys, so the ->exit will only | |
562 | * get invoked after network acitivity has quiesced. We need to | |
563 | * clean up all sockets to quiesce network activity, and use | |
564 | * the unregistration of the per-net loopback device as a trigger | |
565 | * to start that cleanup. | |
566 | */ | |
567 | if (event == NETDEV_UNREGISTER_FINAL && | |
568 | dev->ifindex == LOOPBACK_IFINDEX) | |
569 | rds_tcp_kill_sock(dev_net(dev)); | |
570 | ||
571 | return NOTIFY_DONE; | |
572 | } | |
573 | ||
574 | static struct notifier_block rds_tcp_dev_notifier = { | |
575 | .notifier_call = rds_tcp_dev_event, | |
576 | .priority = -10, /* must be called after other network notifiers */ | |
577 | }; | |
578 | ||
c6a58ffe SV |
579 | /* when sysctl is used to modify some kernel socket parameters,this |
580 | * function resets the RDS connections in that netns so that we can | |
581 | * restart with new parameters. The assumption is that such reset | |
582 | * events are few and far-between. | |
583 | */ | |
584 | static void rds_tcp_sysctl_reset(struct net *net) | |
585 | { | |
586 | struct rds_tcp_connection *tc, *_tc; | |
587 | ||
588 | spin_lock_irq(&rds_tcp_conn_lock); | |
589 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { | |
8edc3aff | 590 | struct net *c_net = tc->t_cpath->cp_conn->c_net; |
c6a58ffe SV |
591 | |
592 | if (net != c_net || !tc->t_sock) | |
593 | continue; | |
594 | ||
02105b2c | 595 | /* reconnect with new parameters */ |
aed20a53 | 596 | rds_conn_path_drop(tc->t_cpath, false); |
c6a58ffe SV |
597 | } |
598 | spin_unlock_irq(&rds_tcp_conn_lock); | |
599 | } | |
600 | ||
601 | static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write, | |
602 | void __user *buffer, size_t *lenp, | |
603 | loff_t *fpos) | |
604 | { | |
605 | struct net *net = current->nsproxy->net_ns; | |
606 | int err; | |
607 | ||
608 | err = proc_dointvec_minmax(ctl, write, buffer, lenp, fpos); | |
609 | if (err < 0) { | |
610 | pr_warn("Invalid input. Must be >= %d\n", | |
611 | *(int *)(ctl->extra1)); | |
612 | return err; | |
613 | } | |
614 | if (write) | |
615 | rds_tcp_sysctl_reset(net); | |
616 | return 0; | |
617 | } | |
618 | ||
467fa153 SV |
619 | static void rds_tcp_exit(void) |
620 | { | |
621 | rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); | |
622 | unregister_pernet_subsys(&rds_tcp_net_ops); | |
623 | if (unregister_netdevice_notifier(&rds_tcp_dev_notifier)) | |
624 | pr_warn("could not unregister rds_tcp_dev_notifier\n"); | |
625 | rds_tcp_destroy_conns(); | |
626 | rds_trans_unregister(&rds_tcp_transport); | |
627 | rds_tcp_recv_exit(); | |
628 | kmem_cache_destroy(rds_tcp_conn_slab); | |
629 | } | |
630 | module_exit(rds_tcp_exit); | |
631 | ||
ff51bf84 | 632 | static int rds_tcp_init(void) |
70041088 AG |
633 | { |
634 | int ret; | |
635 | ||
636 | rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection", | |
637 | sizeof(struct rds_tcp_connection), | |
638 | 0, 0, NULL); | |
8690bfa1 | 639 | if (!rds_tcp_conn_slab) { |
70041088 AG |
640 | ret = -ENOMEM; |
641 | goto out; | |
642 | } | |
643 | ||
16c09b1c SV |
644 | ret = rds_tcp_recv_init(); |
645 | if (ret) | |
3b5923f0 | 646 | goto out_slab; |
467fa153 SV |
647 | |
648 | ret = register_pernet_subsys(&rds_tcp_net_ops); | |
649 | if (ret) | |
16c09b1c | 650 | goto out_recv; |
467fa153 | 651 | |
16c09b1c SV |
652 | ret = register_netdevice_notifier(&rds_tcp_dev_notifier); |
653 | if (ret) { | |
654 | pr_warn("could not register rds_tcp_dev_notifier\n"); | |
3dad5424 | 655 | goto out_pernet; |
16c09b1c | 656 | } |
70041088 | 657 | |
a8d63a53 | 658 | rds_trans_register(&rds_tcp_transport); |
70041088 | 659 | |
70041088 AG |
660 | rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); |
661 | ||
662 | goto out; | |
663 | ||
3dad5424 | 664 | out_pernet: |
467fa153 | 665 | unregister_pernet_subsys(&rds_tcp_net_ops); |
16c09b1c SV |
666 | out_recv: |
667 | rds_tcp_recv_exit(); | |
3b5923f0 | 668 | out_slab: |
70041088 AG |
669 | kmem_cache_destroy(rds_tcp_conn_slab); |
670 | out: | |
671 | return ret; | |
672 | } | |
673 | module_init(rds_tcp_init); | |
674 | ||
675 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); | |
676 | MODULE_DESCRIPTION("RDS: TCP transport"); | |
677 | MODULE_LICENSE("Dual BSD/GPL"); | |
678 |