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00e0f34c 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> | |
34 | #include <linux/list.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
bc3b2d7f | 36 | #include <linux/export.h> |
00e0f34c AG |
37 | #include <net/inet_hashtables.h> |
38 | ||
39 | #include "rds.h" | |
40 | #include "loop.h" | |
00e0f34c AG |
41 | |
42 | #define RDS_CONNECTION_HASH_BITS 12 | |
43 | #define RDS_CONNECTION_HASH_ENTRIES (1 << RDS_CONNECTION_HASH_BITS) | |
44 | #define RDS_CONNECTION_HASH_MASK (RDS_CONNECTION_HASH_ENTRIES - 1) | |
45 | ||
46 | /* converting this to RCU is a chore for another day.. */ | |
47 | static DEFINE_SPINLOCK(rds_conn_lock); | |
48 | static unsigned long rds_conn_count; | |
49 | static struct hlist_head rds_conn_hash[RDS_CONNECTION_HASH_ENTRIES]; | |
50 | static struct kmem_cache *rds_conn_slab; | |
51 | ||
52 | static struct hlist_head *rds_conn_bucket(__be32 laddr, __be32 faddr) | |
53 | { | |
1bbdceef HFS |
54 | static u32 rds_hash_secret __read_mostly; |
55 | ||
56 | unsigned long hash; | |
57 | ||
58 | net_get_random_once(&rds_hash_secret, sizeof(rds_hash_secret)); | |
59 | ||
00e0f34c | 60 | /* Pass NULL, don't need struct net for hash */ |
1bbdceef HFS |
61 | hash = __inet_ehashfn(be32_to_cpu(laddr), 0, |
62 | be32_to_cpu(faddr), 0, | |
63 | rds_hash_secret); | |
00e0f34c AG |
64 | return &rds_conn_hash[hash & RDS_CONNECTION_HASH_MASK]; |
65 | } | |
66 | ||
67 | #define rds_conn_info_set(var, test, suffix) do { \ | |
68 | if (test) \ | |
69 | var |= RDS_INFO_CONNECTION_FLAG_##suffix; \ | |
70 | } while (0) | |
71 | ||
bcf50ef2 | 72 | /* rcu read lock must be held or the connection spinlock */ |
8f384c01 SV |
73 | static struct rds_connection *rds_conn_lookup(struct net *net, |
74 | struct hlist_head *head, | |
00e0f34c AG |
75 | __be32 laddr, __be32 faddr, |
76 | struct rds_transport *trans) | |
77 | { | |
78 | struct rds_connection *conn, *ret = NULL; | |
00e0f34c | 79 | |
b67bfe0d | 80 | hlist_for_each_entry_rcu(conn, head, c_hash_node) { |
00e0f34c | 81 | if (conn->c_faddr == faddr && conn->c_laddr == laddr && |
8f384c01 | 82 | conn->c_trans == trans && net == rds_conn_net(conn)) { |
00e0f34c AG |
83 | ret = conn; |
84 | break; | |
85 | } | |
86 | } | |
87 | rdsdebug("returning conn %p for %pI4 -> %pI4\n", ret, | |
88 | &laddr, &faddr); | |
89 | return ret; | |
90 | } | |
91 | ||
92 | /* | |
93 | * This is called by transports as they're bringing down a connection. | |
94 | * It clears partial message state so that the transport can start sending | |
95 | * and receiving over this connection again in the future. It is up to | |
96 | * the transport to have serialized this call with its send and recv. | |
97 | */ | |
ff51bf84 | 98 | static void rds_conn_reset(struct rds_connection *conn) |
00e0f34c AG |
99 | { |
100 | rdsdebug("connection %pI4 to %pI4 reset\n", | |
101 | &conn->c_laddr, &conn->c_faddr); | |
102 | ||
103 | rds_stats_inc(s_conn_reset); | |
104 | rds_send_reset(conn); | |
105 | conn->c_flags = 0; | |
106 | ||
107 | /* Do not clear next_rx_seq here, else we cannot distinguish | |
108 | * retransmitted packets from new packets, and will hand all | |
109 | * of them to the application. That is not consistent with the | |
110 | * reliability guarantees of RDS. */ | |
111 | } | |
112 | ||
113 | /* | |
114 | * There is only every one 'conn' for a given pair of addresses in the | |
115 | * system at a time. They contain messages to be retransmitted and so | |
116 | * span the lifetime of the actual underlying transport connections. | |
117 | * | |
118 | * For now they are not garbage collected once they're created. They | |
119 | * are torn down as the module is removed, if ever. | |
120 | */ | |
d5a8ac28 SV |
121 | static struct rds_connection *__rds_conn_create(struct net *net, |
122 | __be32 laddr, __be32 faddr, | |
00e0f34c AG |
123 | struct rds_transport *trans, gfp_t gfp, |
124 | int is_outgoing) | |
125 | { | |
cb24405e | 126 | struct rds_connection *conn, *parent = NULL; |
00e0f34c | 127 | struct hlist_head *head = rds_conn_bucket(laddr, faddr); |
5adb5bc6 | 128 | struct rds_transport *loop_trans; |
00e0f34c AG |
129 | unsigned long flags; |
130 | int ret; | |
f711a6ae | 131 | struct rds_transport *otrans = trans; |
00e0f34c | 132 | |
f711a6ae SV |
133 | if (!is_outgoing && otrans->t_type == RDS_TRANS_TCP) |
134 | goto new_conn; | |
bcf50ef2 | 135 | rcu_read_lock(); |
8f384c01 | 136 | conn = rds_conn_lookup(net, head, laddr, faddr, trans); |
f64f9e71 | 137 | if (conn && conn->c_loopback && conn->c_trans != &rds_loop_transport && |
1789b2c0 | 138 | laddr == faddr && !is_outgoing) { |
00e0f34c AG |
139 | /* This is a looped back IB connection, and we're |
140 | * called by the code handling the incoming connect. | |
141 | * We need a second connection object into which we | |
142 | * can stick the other QP. */ | |
143 | parent = conn; | |
144 | conn = parent->c_passive; | |
145 | } | |
bcf50ef2 | 146 | rcu_read_unlock(); |
00e0f34c AG |
147 | if (conn) |
148 | goto out; | |
149 | ||
f711a6ae | 150 | new_conn: |
05a178ec | 151 | conn = kmem_cache_zalloc(rds_conn_slab, gfp); |
8690bfa1 | 152 | if (!conn) { |
00e0f34c AG |
153 | conn = ERR_PTR(-ENOMEM); |
154 | goto out; | |
155 | } | |
156 | ||
00e0f34c | 157 | INIT_HLIST_NODE(&conn->c_hash_node); |
00e0f34c AG |
158 | conn->c_laddr = laddr; |
159 | conn->c_faddr = faddr; | |
160 | spin_lock_init(&conn->c_lock); | |
161 | conn->c_next_tx_seq = 1; | |
d5a8ac28 | 162 | rds_conn_net_set(conn, net); |
00e0f34c | 163 | |
0f4b1c7e | 164 | init_waitqueue_head(&conn->c_waitq); |
00e0f34c AG |
165 | INIT_LIST_HEAD(&conn->c_send_queue); |
166 | INIT_LIST_HEAD(&conn->c_retrans); | |
167 | ||
168 | ret = rds_cong_get_maps(conn); | |
169 | if (ret) { | |
170 | kmem_cache_free(rds_conn_slab, conn); | |
171 | conn = ERR_PTR(ret); | |
172 | goto out; | |
173 | } | |
174 | ||
175 | /* | |
176 | * This is where a connection becomes loopback. If *any* RDS sockets | |
177 | * can bind to the destination address then we'd rather the messages | |
178 | * flow through loopback rather than either transport. | |
179 | */ | |
d5a8ac28 | 180 | loop_trans = rds_trans_get_preferred(net, faddr); |
5adb5bc6 ZB |
181 | if (loop_trans) { |
182 | rds_trans_put(loop_trans); | |
00e0f34c AG |
183 | conn->c_loopback = 1; |
184 | if (is_outgoing && trans->t_prefer_loopback) { | |
185 | /* "outgoing" connection - and the transport | |
186 | * says it wants the connection handled by the | |
187 | * loopback transport. This is what TCP does. | |
188 | */ | |
189 | trans = &rds_loop_transport; | |
190 | } | |
191 | } | |
192 | ||
74e98eb0 SL |
193 | if (trans == NULL) { |
194 | kmem_cache_free(rds_conn_slab, conn); | |
195 | conn = ERR_PTR(-ENODEV); | |
196 | goto out; | |
197 | } | |
198 | ||
00e0f34c AG |
199 | conn->c_trans = trans; |
200 | ||
201 | ret = trans->conn_alloc(conn, gfp); | |
202 | if (ret) { | |
203 | kmem_cache_free(rds_conn_slab, conn); | |
204 | conn = ERR_PTR(ret); | |
205 | goto out; | |
206 | } | |
207 | ||
208 | atomic_set(&conn->c_state, RDS_CONN_DOWN); | |
443be0e5 | 209 | conn->c_send_gen = 0; |
00e0f34c AG |
210 | conn->c_reconnect_jiffies = 0; |
211 | INIT_DELAYED_WORK(&conn->c_send_w, rds_send_worker); | |
212 | INIT_DELAYED_WORK(&conn->c_recv_w, rds_recv_worker); | |
213 | INIT_DELAYED_WORK(&conn->c_conn_w, rds_connect_worker); | |
214 | INIT_WORK(&conn->c_down_w, rds_shutdown_worker); | |
215 | mutex_init(&conn->c_cm_lock); | |
216 | conn->c_flags = 0; | |
217 | ||
218 | rdsdebug("allocated conn %p for %pI4 -> %pI4 over %s %s\n", | |
219 | conn, &laddr, &faddr, | |
220 | trans->t_name ? trans->t_name : "[unknown]", | |
221 | is_outgoing ? "(outgoing)" : ""); | |
222 | ||
cb24405e AG |
223 | /* |
224 | * Since we ran without holding the conn lock, someone could | |
225 | * have created the same conn (either normal or passive) in the | |
226 | * interim. We check while holding the lock. If we won, we complete | |
227 | * init and return our conn. If we lost, we rollback and return the | |
228 | * other one. | |
229 | */ | |
00e0f34c | 230 | spin_lock_irqsave(&rds_conn_lock, flags); |
cb24405e AG |
231 | if (parent) { |
232 | /* Creating passive conn */ | |
233 | if (parent->c_passive) { | |
234 | trans->conn_free(conn->c_transport_data); | |
235 | kmem_cache_free(rds_conn_slab, conn); | |
236 | conn = parent->c_passive; | |
237 | } else { | |
00e0f34c | 238 | parent->c_passive = conn; |
cb24405e AG |
239 | rds_cong_add_conn(conn); |
240 | rds_conn_count++; | |
241 | } | |
00e0f34c | 242 | } else { |
cb24405e AG |
243 | /* Creating normal conn */ |
244 | struct rds_connection *found; | |
245 | ||
c82ac7e6 SV |
246 | if (!is_outgoing && otrans->t_type == RDS_TRANS_TCP) |
247 | found = NULL; | |
248 | else | |
8f384c01 | 249 | found = rds_conn_lookup(net, head, laddr, faddr, trans); |
cb24405e AG |
250 | if (found) { |
251 | trans->conn_free(conn->c_transport_data); | |
252 | kmem_cache_free(rds_conn_slab, conn); | |
253 | conn = found; | |
254 | } else { | |
c82ac7e6 SV |
255 | if ((is_outgoing && otrans->t_type == RDS_TRANS_TCP) || |
256 | (otrans->t_type != RDS_TRANS_TCP)) { | |
257 | /* Only the active side should be added to | |
258 | * reconnect list for TCP. | |
259 | */ | |
260 | hlist_add_head_rcu(&conn->c_hash_node, head); | |
261 | } | |
cb24405e AG |
262 | rds_cong_add_conn(conn); |
263 | rds_conn_count++; | |
264 | } | |
00e0f34c | 265 | } |
00e0f34c AG |
266 | spin_unlock_irqrestore(&rds_conn_lock, flags); |
267 | ||
268 | out: | |
269 | return conn; | |
270 | } | |
271 | ||
d5a8ac28 SV |
272 | struct rds_connection *rds_conn_create(struct net *net, |
273 | __be32 laddr, __be32 faddr, | |
00e0f34c AG |
274 | struct rds_transport *trans, gfp_t gfp) |
275 | { | |
d5a8ac28 | 276 | return __rds_conn_create(net, laddr, faddr, trans, gfp, 0); |
00e0f34c | 277 | } |
616b757a | 278 | EXPORT_SYMBOL_GPL(rds_conn_create); |
00e0f34c | 279 | |
d5a8ac28 SV |
280 | struct rds_connection *rds_conn_create_outgoing(struct net *net, |
281 | __be32 laddr, __be32 faddr, | |
00e0f34c AG |
282 | struct rds_transport *trans, gfp_t gfp) |
283 | { | |
d5a8ac28 | 284 | return __rds_conn_create(net, laddr, faddr, trans, gfp, 1); |
00e0f34c | 285 | } |
616b757a | 286 | EXPORT_SYMBOL_GPL(rds_conn_create_outgoing); |
00e0f34c | 287 | |
2dc39357 AG |
288 | void rds_conn_shutdown(struct rds_connection *conn) |
289 | { | |
290 | /* shut it down unless it's down already */ | |
291 | if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_DOWN)) { | |
292 | /* | |
293 | * Quiesce the connection mgmt handlers before we start tearing | |
294 | * things down. We don't hold the mutex for the entire | |
295 | * duration of the shutdown operation, else we may be | |
296 | * deadlocking with the CM handler. Instead, the CM event | |
297 | * handler is supposed to check for state DISCONNECTING | |
298 | */ | |
299 | mutex_lock(&conn->c_cm_lock); | |
300 | if (!rds_conn_transition(conn, RDS_CONN_UP, RDS_CONN_DISCONNECTING) | |
301 | && !rds_conn_transition(conn, RDS_CONN_ERROR, RDS_CONN_DISCONNECTING)) { | |
302 | rds_conn_error(conn, "shutdown called in state %d\n", | |
303 | atomic_read(&conn->c_state)); | |
304 | mutex_unlock(&conn->c_cm_lock); | |
305 | return; | |
306 | } | |
307 | mutex_unlock(&conn->c_cm_lock); | |
308 | ||
0f4b1c7e ZB |
309 | wait_event(conn->c_waitq, |
310 | !test_bit(RDS_IN_XMIT, &conn->c_flags)); | |
73ce4317 | 311 | wait_event(conn->c_waitq, |
312 | !test_bit(RDS_RECV_REFILL, &conn->c_flags)); | |
7e3f2952 | 313 | |
2dc39357 AG |
314 | conn->c_trans->conn_shutdown(conn); |
315 | rds_conn_reset(conn); | |
2dc39357 AG |
316 | |
317 | if (!rds_conn_transition(conn, RDS_CONN_DISCONNECTING, RDS_CONN_DOWN)) { | |
318 | /* This can happen - eg when we're in the middle of tearing | |
319 | * down the connection, and someone unloads the rds module. | |
320 | * Quite reproduceable with loopback connections. | |
321 | * Mostly harmless. | |
322 | */ | |
323 | rds_conn_error(conn, | |
324 | "%s: failed to transition to state DOWN, " | |
325 | "current state is %d\n", | |
326 | __func__, | |
327 | atomic_read(&conn->c_state)); | |
328 | return; | |
329 | } | |
330 | } | |
331 | ||
332 | /* Then reconnect if it's still live. | |
333 | * The passive side of an IB loopback connection is never added | |
334 | * to the conn hash, so we never trigger a reconnect on this | |
335 | * conn - the reconnect is always triggered by the active peer. */ | |
336 | cancel_delayed_work_sync(&conn->c_conn_w); | |
bcf50ef2 CM |
337 | rcu_read_lock(); |
338 | if (!hlist_unhashed(&conn->c_hash_node)) { | |
339 | rcu_read_unlock(); | |
2dc39357 | 340 | rds_queue_reconnect(conn); |
bcf50ef2 CM |
341 | } else { |
342 | rcu_read_unlock(); | |
343 | } | |
2dc39357 AG |
344 | } |
345 | ||
346 | /* | |
347 | * Stop and free a connection. | |
ffcec0e1 ZB |
348 | * |
349 | * This can only be used in very limited circumstances. It assumes that once | |
350 | * the conn has been shutdown that no one else is referencing the connection. | |
351 | * We can only ensure this in the rmmod path in the current code. | |
2dc39357 | 352 | */ |
00e0f34c AG |
353 | void rds_conn_destroy(struct rds_connection *conn) |
354 | { | |
355 | struct rds_message *rm, *rtmp; | |
fe8ff6b5 | 356 | unsigned long flags; |
00e0f34c AG |
357 | |
358 | rdsdebug("freeing conn %p for %pI4 -> " | |
359 | "%pI4\n", conn, &conn->c_laddr, | |
360 | &conn->c_faddr); | |
361 | ||
abf45439 CM |
362 | /* Ensure conn will not be scheduled for reconnect */ |
363 | spin_lock_irq(&rds_conn_lock); | |
bcf50ef2 | 364 | hlist_del_init_rcu(&conn->c_hash_node); |
abf45439 | 365 | spin_unlock_irq(&rds_conn_lock); |
bcf50ef2 CM |
366 | synchronize_rcu(); |
367 | ||
ffcec0e1 ZB |
368 | /* shut the connection down */ |
369 | rds_conn_drop(conn); | |
370 | flush_work(&conn->c_down_w); | |
00e0f34c | 371 | |
4518071a ZB |
372 | /* make sure lingering queued work won't try to ref the conn */ |
373 | cancel_delayed_work_sync(&conn->c_send_w); | |
374 | cancel_delayed_work_sync(&conn->c_recv_w); | |
375 | ||
00e0f34c AG |
376 | /* tear down queued messages */ |
377 | list_for_each_entry_safe(rm, rtmp, | |
378 | &conn->c_send_queue, | |
379 | m_conn_item) { | |
380 | list_del_init(&rm->m_conn_item); | |
381 | BUG_ON(!list_empty(&rm->m_sock_item)); | |
382 | rds_message_put(rm); | |
383 | } | |
384 | if (conn->c_xmit_rm) | |
385 | rds_message_put(conn->c_xmit_rm); | |
386 | ||
387 | conn->c_trans->conn_free(conn->c_transport_data); | |
388 | ||
389 | /* | |
390 | * The congestion maps aren't freed up here. They're | |
391 | * freed by rds_cong_exit() after all the connections | |
392 | * have been freed. | |
393 | */ | |
394 | rds_cong_remove_conn(conn); | |
395 | ||
396 | BUG_ON(!list_empty(&conn->c_retrans)); | |
397 | kmem_cache_free(rds_conn_slab, conn); | |
398 | ||
fe8ff6b5 | 399 | spin_lock_irqsave(&rds_conn_lock, flags); |
00e0f34c | 400 | rds_conn_count--; |
fe8ff6b5 | 401 | spin_unlock_irqrestore(&rds_conn_lock, flags); |
00e0f34c | 402 | } |
616b757a | 403 | EXPORT_SYMBOL_GPL(rds_conn_destroy); |
00e0f34c AG |
404 | |
405 | static void rds_conn_message_info(struct socket *sock, unsigned int len, | |
406 | struct rds_info_iterator *iter, | |
407 | struct rds_info_lengths *lens, | |
408 | int want_send) | |
409 | { | |
410 | struct hlist_head *head; | |
00e0f34c AG |
411 | struct list_head *list; |
412 | struct rds_connection *conn; | |
413 | struct rds_message *rm; | |
00e0f34c | 414 | unsigned int total = 0; |
501dcccd | 415 | unsigned long flags; |
00e0f34c AG |
416 | size_t i; |
417 | ||
418 | len /= sizeof(struct rds_info_message); | |
419 | ||
bcf50ef2 | 420 | rcu_read_lock(); |
00e0f34c AG |
421 | |
422 | for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash); | |
423 | i++, head++) { | |
b67bfe0d | 424 | hlist_for_each_entry_rcu(conn, head, c_hash_node) { |
00e0f34c AG |
425 | if (want_send) |
426 | list = &conn->c_send_queue; | |
427 | else | |
428 | list = &conn->c_retrans; | |
429 | ||
501dcccd | 430 | spin_lock_irqsave(&conn->c_lock, flags); |
00e0f34c AG |
431 | |
432 | /* XXX too lazy to maintain counts.. */ | |
433 | list_for_each_entry(rm, list, m_conn_item) { | |
434 | total++; | |
435 | if (total <= len) | |
436 | rds_inc_info_copy(&rm->m_inc, iter, | |
437 | conn->c_laddr, | |
438 | conn->c_faddr, 0); | |
439 | } | |
440 | ||
501dcccd | 441 | spin_unlock_irqrestore(&conn->c_lock, flags); |
00e0f34c AG |
442 | } |
443 | } | |
bcf50ef2 | 444 | rcu_read_unlock(); |
00e0f34c AG |
445 | |
446 | lens->nr = total; | |
447 | lens->each = sizeof(struct rds_info_message); | |
448 | } | |
449 | ||
450 | static void rds_conn_message_info_send(struct socket *sock, unsigned int len, | |
451 | struct rds_info_iterator *iter, | |
452 | struct rds_info_lengths *lens) | |
453 | { | |
454 | rds_conn_message_info(sock, len, iter, lens, 1); | |
455 | } | |
456 | ||
457 | static void rds_conn_message_info_retrans(struct socket *sock, | |
458 | unsigned int len, | |
459 | struct rds_info_iterator *iter, | |
460 | struct rds_info_lengths *lens) | |
461 | { | |
462 | rds_conn_message_info(sock, len, iter, lens, 0); | |
463 | } | |
464 | ||
465 | void rds_for_each_conn_info(struct socket *sock, unsigned int len, | |
466 | struct rds_info_iterator *iter, | |
467 | struct rds_info_lengths *lens, | |
468 | int (*visitor)(struct rds_connection *, void *), | |
469 | size_t item_len) | |
470 | { | |
471 | uint64_t buffer[(item_len + 7) / 8]; | |
472 | struct hlist_head *head; | |
00e0f34c | 473 | struct rds_connection *conn; |
00e0f34c AG |
474 | size_t i; |
475 | ||
bcf50ef2 | 476 | rcu_read_lock(); |
00e0f34c AG |
477 | |
478 | lens->nr = 0; | |
479 | lens->each = item_len; | |
480 | ||
481 | for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash); | |
482 | i++, head++) { | |
b67bfe0d | 483 | hlist_for_each_entry_rcu(conn, head, c_hash_node) { |
00e0f34c AG |
484 | |
485 | /* XXX no c_lock usage.. */ | |
486 | if (!visitor(conn, buffer)) | |
487 | continue; | |
488 | ||
489 | /* We copy as much as we can fit in the buffer, | |
490 | * but we count all items so that the caller | |
491 | * can resize the buffer. */ | |
492 | if (len >= item_len) { | |
493 | rds_info_copy(iter, buffer, item_len); | |
494 | len -= item_len; | |
495 | } | |
496 | lens->nr++; | |
497 | } | |
498 | } | |
bcf50ef2 | 499 | rcu_read_unlock(); |
00e0f34c | 500 | } |
616b757a | 501 | EXPORT_SYMBOL_GPL(rds_for_each_conn_info); |
00e0f34c AG |
502 | |
503 | static int rds_conn_info_visitor(struct rds_connection *conn, | |
504 | void *buffer) | |
505 | { | |
506 | struct rds_info_connection *cinfo = buffer; | |
507 | ||
508 | cinfo->next_tx_seq = conn->c_next_tx_seq; | |
509 | cinfo->next_rx_seq = conn->c_next_rx_seq; | |
510 | cinfo->laddr = conn->c_laddr; | |
511 | cinfo->faddr = conn->c_faddr; | |
512 | strncpy(cinfo->transport, conn->c_trans->t_name, | |
513 | sizeof(cinfo->transport)); | |
514 | cinfo->flags = 0; | |
515 | ||
0f4b1c7e ZB |
516 | rds_conn_info_set(cinfo->flags, test_bit(RDS_IN_XMIT, &conn->c_flags), |
517 | SENDING); | |
00e0f34c AG |
518 | /* XXX Future: return the state rather than these funky bits */ |
519 | rds_conn_info_set(cinfo->flags, | |
520 | atomic_read(&conn->c_state) == RDS_CONN_CONNECTING, | |
521 | CONNECTING); | |
522 | rds_conn_info_set(cinfo->flags, | |
523 | atomic_read(&conn->c_state) == RDS_CONN_UP, | |
524 | CONNECTED); | |
525 | return 1; | |
526 | } | |
527 | ||
528 | static void rds_conn_info(struct socket *sock, unsigned int len, | |
529 | struct rds_info_iterator *iter, | |
530 | struct rds_info_lengths *lens) | |
531 | { | |
532 | rds_for_each_conn_info(sock, len, iter, lens, | |
533 | rds_conn_info_visitor, | |
534 | sizeof(struct rds_info_connection)); | |
535 | } | |
536 | ||
ef87b7ea | 537 | int rds_conn_init(void) |
00e0f34c AG |
538 | { |
539 | rds_conn_slab = kmem_cache_create("rds_connection", | |
540 | sizeof(struct rds_connection), | |
541 | 0, 0, NULL); | |
8690bfa1 | 542 | if (!rds_conn_slab) |
00e0f34c AG |
543 | return -ENOMEM; |
544 | ||
545 | rds_info_register_func(RDS_INFO_CONNECTIONS, rds_conn_info); | |
546 | rds_info_register_func(RDS_INFO_SEND_MESSAGES, | |
547 | rds_conn_message_info_send); | |
548 | rds_info_register_func(RDS_INFO_RETRANS_MESSAGES, | |
549 | rds_conn_message_info_retrans); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | void rds_conn_exit(void) | |
555 | { | |
556 | rds_loop_exit(); | |
557 | ||
558 | WARN_ON(!hlist_empty(rds_conn_hash)); | |
559 | ||
560 | kmem_cache_destroy(rds_conn_slab); | |
561 | ||
562 | rds_info_deregister_func(RDS_INFO_CONNECTIONS, rds_conn_info); | |
563 | rds_info_deregister_func(RDS_INFO_SEND_MESSAGES, | |
564 | rds_conn_message_info_send); | |
565 | rds_info_deregister_func(RDS_INFO_RETRANS_MESSAGES, | |
566 | rds_conn_message_info_retrans); | |
567 | } | |
568 | ||
569 | /* | |
570 | * Force a disconnect | |
571 | */ | |
572 | void rds_conn_drop(struct rds_connection *conn) | |
573 | { | |
574 | atomic_set(&conn->c_state, RDS_CONN_ERROR); | |
575 | queue_work(rds_wq, &conn->c_down_w); | |
576 | } | |
616b757a | 577 | EXPORT_SYMBOL_GPL(rds_conn_drop); |
00e0f34c | 578 | |
f3c6808d ZB |
579 | /* |
580 | * If the connection is down, trigger a connect. We may have scheduled a | |
581 | * delayed reconnect however - in this case we should not interfere. | |
582 | */ | |
583 | void rds_conn_connect_if_down(struct rds_connection *conn) | |
584 | { | |
585 | if (rds_conn_state(conn) == RDS_CONN_DOWN && | |
586 | !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags)) | |
587 | queue_delayed_work(rds_wq, &conn->c_conn_w, 0); | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(rds_conn_connect_if_down); | |
590 | ||
00e0f34c AG |
591 | /* |
592 | * An error occurred on the connection | |
593 | */ | |
594 | void | |
595 | __rds_conn_error(struct rds_connection *conn, const char *fmt, ...) | |
596 | { | |
597 | va_list ap; | |
598 | ||
599 | va_start(ap, fmt); | |
600 | vprintk(fmt, ap); | |
601 | va_end(ap); | |
602 | ||
603 | rds_conn_drop(conn); | |
604 | } |