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