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TOMOYO Linux Cross Reference
Linux/net/rds/connection.c

Version: ~ [ linux-5.6.3 ] ~ [ linux-5.5.16 ] ~ [ linux-5.4.31 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.114 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.175 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.218 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.218 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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>
 35 #include <linux/slab.h>
 36 #include <linux/export.h>
 37 #include <net/inet_hashtables.h>
 38 
 39 #include "rds.h"
 40 #include "loop.h"
 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 {
 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 
 60         /* Pass NULL, don't need struct net for hash */
 61         hash = __inet_ehashfn(be32_to_cpu(laddr), 0,
 62                               be32_to_cpu(faddr), 0,
 63                               rds_hash_secret);
 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 
 72 /* rcu read lock must be held or the connection spinlock */
 73 static struct rds_connection *rds_conn_lookup(struct net *net,
 74                                               struct hlist_head *head,
 75                                               __be32 laddr, __be32 faddr,
 76                                               struct rds_transport *trans)
 77 {
 78         struct rds_connection *conn, *ret = NULL;
 79 
 80         hlist_for_each_entry_rcu(conn, head, c_hash_node) {
 81                 if (conn->c_faddr == faddr && conn->c_laddr == laddr &&
 82                     conn->c_trans == trans && net == rds_conn_net(conn)) {
 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  */
 98 static void rds_conn_reset(struct rds_connection *conn)
 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  */
121 static struct rds_connection *__rds_conn_create(struct net *net,
122                                                 __be32 laddr, __be32 faddr,
123                                        struct rds_transport *trans, gfp_t gfp,
124                                        int is_outgoing)
125 {
126         struct rds_connection *conn, *parent = NULL;
127         struct hlist_head *head = rds_conn_bucket(laddr, faddr);
128         struct rds_transport *loop_trans;
129         unsigned long flags;
130         int ret;
131 
132         rcu_read_lock();
133         conn = rds_conn_lookup(net, head, laddr, faddr, trans);
134         if (conn && conn->c_loopback && conn->c_trans != &rds_loop_transport &&
135             laddr == faddr && !is_outgoing) {
136                 /* This is a looped back IB connection, and we're
137                  * called by the code handling the incoming connect.
138                  * We need a second connection object into which we
139                  * can stick the other QP. */
140                 parent = conn;
141                 conn = parent->c_passive;
142         }
143         rcu_read_unlock();
144         if (conn)
145                 goto out;
146 
147         conn = kmem_cache_zalloc(rds_conn_slab, gfp);
148         if (!conn) {
149                 conn = ERR_PTR(-ENOMEM);
150                 goto out;
151         }
152 
153         INIT_HLIST_NODE(&conn->c_hash_node);
154         conn->c_laddr = laddr;
155         conn->c_faddr = faddr;
156         spin_lock_init(&conn->c_lock);
157         conn->c_next_tx_seq = 1;
158         rds_conn_net_set(conn, net);
159 
160         init_waitqueue_head(&conn->c_waitq);
161         INIT_LIST_HEAD(&conn->c_send_queue);
162         INIT_LIST_HEAD(&conn->c_retrans);
163 
164         ret = rds_cong_get_maps(conn);
165         if (ret) {
166                 kmem_cache_free(rds_conn_slab, conn);
167                 conn = ERR_PTR(ret);
168                 goto out;
169         }
170 
171         /*
172          * This is where a connection becomes loopback.  If *any* RDS sockets
173          * can bind to the destination address then we'd rather the messages
174          * flow through loopback rather than either transport.
175          */
176         loop_trans = rds_trans_get_preferred(net, faddr);
177         if (loop_trans) {
178                 rds_trans_put(loop_trans);
179                 conn->c_loopback = 1;
180                 if (is_outgoing && trans->t_prefer_loopback) {
181                         /* "outgoing" connection - and the transport
182                          * says it wants the connection handled by the
183                          * loopback transport. This is what TCP does.
184                          */
185                         trans = &rds_loop_transport;
186                 }
187         }
188 
189         conn->c_trans = trans;
190 
191         ret = trans->conn_alloc(conn, gfp);
192         if (ret) {
193                 kmem_cache_free(rds_conn_slab, conn);
194                 conn = ERR_PTR(ret);
195                 goto out;
196         }
197 
198         atomic_set(&conn->c_state, RDS_CONN_DOWN);
199         conn->c_send_gen = 0;
200         conn->c_outgoing = (is_outgoing ? 1 : 0);
201         conn->c_reconnect_jiffies = 0;
202         INIT_DELAYED_WORK(&conn->c_send_w, rds_send_worker);
203         INIT_DELAYED_WORK(&conn->c_recv_w, rds_recv_worker);
204         INIT_DELAYED_WORK(&conn->c_conn_w, rds_connect_worker);
205         INIT_WORK(&conn->c_down_w, rds_shutdown_worker);
206         mutex_init(&conn->c_cm_lock);
207         conn->c_flags = 0;
208 
209         rdsdebug("allocated conn %p for %pI4 -> %pI4 over %s %s\n",
210           conn, &laddr, &faddr,
211           trans->t_name ? trans->t_name : "[unknown]",
212           is_outgoing ? "(outgoing)" : "");
213 
214         /*
215          * Since we ran without holding the conn lock, someone could
216          * have created the same conn (either normal or passive) in the
217          * interim. We check while holding the lock. If we won, we complete
218          * init and return our conn. If we lost, we rollback and return the
219          * other one.
220          */
221         spin_lock_irqsave(&rds_conn_lock, flags);
222         if (parent) {
223                 /* Creating passive conn */
224                 if (parent->c_passive) {
225                         trans->conn_free(conn->c_transport_data);
226                         kmem_cache_free(rds_conn_slab, conn);
227                         conn = parent->c_passive;
228                 } else {
229                         parent->c_passive = conn;
230                         rds_cong_add_conn(conn);
231                         rds_conn_count++;
232                 }
233         } else {
234                 /* Creating normal conn */
235                 struct rds_connection *found;
236 
237                 found = rds_conn_lookup(net, head, laddr, faddr, trans);
238                 if (found) {
239                         trans->conn_free(conn->c_transport_data);
240                         kmem_cache_free(rds_conn_slab, conn);
241                         conn = found;
242                 } else {
243                         hlist_add_head_rcu(&conn->c_hash_node, head);
244                         rds_cong_add_conn(conn);
245                         rds_conn_count++;
246                 }
247         }
248         spin_unlock_irqrestore(&rds_conn_lock, flags);
249 
250 out:
251         return conn;
252 }
253 
254 struct rds_connection *rds_conn_create(struct net *net,
255                                        __be32 laddr, __be32 faddr,
256                                        struct rds_transport *trans, gfp_t gfp)
257 {
258         return __rds_conn_create(net, laddr, faddr, trans, gfp, 0);
259 }
260 EXPORT_SYMBOL_GPL(rds_conn_create);
261 
262 struct rds_connection *rds_conn_create_outgoing(struct net *net,
263                                                 __be32 laddr, __be32 faddr,
264                                        struct rds_transport *trans, gfp_t gfp)
265 {
266         return __rds_conn_create(net, laddr, faddr, trans, gfp, 1);
267 }
268 EXPORT_SYMBOL_GPL(rds_conn_create_outgoing);
269 
270 void rds_conn_shutdown(struct rds_connection *conn)
271 {
272         /* shut it down unless it's down already */
273         if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_DOWN)) {
274                 /*
275                  * Quiesce the connection mgmt handlers before we start tearing
276                  * things down. We don't hold the mutex for the entire
277                  * duration of the shutdown operation, else we may be
278                  * deadlocking with the CM handler. Instead, the CM event
279                  * handler is supposed to check for state DISCONNECTING
280                  */
281                 mutex_lock(&conn->c_cm_lock);
282                 if (!rds_conn_transition(conn, RDS_CONN_UP, RDS_CONN_DISCONNECTING)
283                  && !rds_conn_transition(conn, RDS_CONN_ERROR, RDS_CONN_DISCONNECTING)) {
284                         rds_conn_error(conn, "shutdown called in state %d\n",
285                                         atomic_read(&conn->c_state));
286                         mutex_unlock(&conn->c_cm_lock);
287                         return;
288                 }
289                 mutex_unlock(&conn->c_cm_lock);
290 
291                 wait_event(conn->c_waitq,
292                            !test_bit(RDS_IN_XMIT, &conn->c_flags));
293                 wait_event(conn->c_waitq,
294                            !test_bit(RDS_RECV_REFILL, &conn->c_flags));
295 
296                 conn->c_trans->conn_shutdown(conn);
297                 rds_conn_reset(conn);
298 
299                 if (!rds_conn_transition(conn, RDS_CONN_DISCONNECTING, RDS_CONN_DOWN)) {
300                         /* This can happen - eg when we're in the middle of tearing
301                          * down the connection, and someone unloads the rds module.
302                          * Quite reproduceable with loopback connections.
303                          * Mostly harmless.
304                          */
305                         rds_conn_error(conn,
306                                 "%s: failed to transition to state DOWN, "
307                                 "current state is %d\n",
308                                 __func__,
309                                 atomic_read(&conn->c_state));
310                         return;
311                 }
312         }
313 
314         /* Then reconnect if it's still live.
315          * The passive side of an IB loopback connection is never added
316          * to the conn hash, so we never trigger a reconnect on this
317          * conn - the reconnect is always triggered by the active peer. */
318         cancel_delayed_work_sync(&conn->c_conn_w);
319         rcu_read_lock();
320         if (!hlist_unhashed(&conn->c_hash_node)) {
321                 rcu_read_unlock();
322                 if (conn->c_trans->t_type != RDS_TRANS_TCP ||
323                     conn->c_outgoing == 1)
324                         rds_queue_reconnect(conn);
325         } else {
326                 rcu_read_unlock();
327         }
328 }
329 
330 /*
331  * Stop and free a connection.
332  *
333  * This can only be used in very limited circumstances.  It assumes that once
334  * the conn has been shutdown that no one else is referencing the connection.
335  * We can only ensure this in the rmmod path in the current code.
336  */
337 void rds_conn_destroy(struct rds_connection *conn)
338 {
339         struct rds_message *rm, *rtmp;
340         unsigned long flags;
341 
342         rdsdebug("freeing conn %p for %pI4 -> "
343                  "%pI4\n", conn, &conn->c_laddr,
344                  &conn->c_faddr);
345 
346         /* Ensure conn will not be scheduled for reconnect */
347         spin_lock_irq(&rds_conn_lock);
348         hlist_del_init_rcu(&conn->c_hash_node);
349         spin_unlock_irq(&rds_conn_lock);
350         synchronize_rcu();
351 
352         /* shut the connection down */
353         rds_conn_drop(conn);
354         flush_work(&conn->c_down_w);
355 
356         /* make sure lingering queued work won't try to ref the conn */
357         cancel_delayed_work_sync(&conn->c_send_w);
358         cancel_delayed_work_sync(&conn->c_recv_w);
359 
360         /* tear down queued messages */
361         list_for_each_entry_safe(rm, rtmp,
362                                  &conn->c_send_queue,
363                                  m_conn_item) {
364                 list_del_init(&rm->m_conn_item);
365                 BUG_ON(!list_empty(&rm->m_sock_item));
366                 rds_message_put(rm);
367         }
368         if (conn->c_xmit_rm)
369                 rds_message_put(conn->c_xmit_rm);
370 
371         conn->c_trans->conn_free(conn->c_transport_data);
372 
373         /*
374          * The congestion maps aren't freed up here.  They're
375          * freed by rds_cong_exit() after all the connections
376          * have been freed.
377          */
378         rds_cong_remove_conn(conn);
379 
380         BUG_ON(!list_empty(&conn->c_retrans));
381         kmem_cache_free(rds_conn_slab, conn);
382 
383         spin_lock_irqsave(&rds_conn_lock, flags);
384         rds_conn_count--;
385         spin_unlock_irqrestore(&rds_conn_lock, flags);
386 }
387 EXPORT_SYMBOL_GPL(rds_conn_destroy);
388 
389 static void rds_conn_message_info(struct socket *sock, unsigned int len,
390                                   struct rds_info_iterator *iter,
391                                   struct rds_info_lengths *lens,
392                                   int want_send)
393 {
394         struct hlist_head *head;
395         struct list_head *list;
396         struct rds_connection *conn;
397         struct rds_message *rm;
398         unsigned int total = 0;
399         unsigned long flags;
400         size_t i;
401 
402         len /= sizeof(struct rds_info_message);
403 
404         rcu_read_lock();
405 
406         for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash);
407              i++, head++) {
408                 hlist_for_each_entry_rcu(conn, head, c_hash_node) {
409                         if (want_send)
410                                 list = &conn->c_send_queue;
411                         else
412                                 list = &conn->c_retrans;
413 
414                         spin_lock_irqsave(&conn->c_lock, flags);
415 
416                         /* XXX too lazy to maintain counts.. */
417                         list_for_each_entry(rm, list, m_conn_item) {
418                                 total++;
419                                 if (total <= len)
420                                         rds_inc_info_copy(&rm->m_inc, iter,
421                                                           conn->c_laddr,
422                                                           conn->c_faddr, 0);
423                         }
424 
425                         spin_unlock_irqrestore(&conn->c_lock, flags);
426                 }
427         }
428         rcu_read_unlock();
429 
430         lens->nr = total;
431         lens->each = sizeof(struct rds_info_message);
432 }
433 
434 static void rds_conn_message_info_send(struct socket *sock, unsigned int len,
435                                        struct rds_info_iterator *iter,
436                                        struct rds_info_lengths *lens)
437 {
438         rds_conn_message_info(sock, len, iter, lens, 1);
439 }
440 
441 static void rds_conn_message_info_retrans(struct socket *sock,
442                                           unsigned int len,
443                                           struct rds_info_iterator *iter,
444                                           struct rds_info_lengths *lens)
445 {
446         rds_conn_message_info(sock, len, iter, lens, 0);
447 }
448 
449 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
450                           struct rds_info_iterator *iter,
451                           struct rds_info_lengths *lens,
452                           int (*visitor)(struct rds_connection *, void *),
453                           size_t item_len)
454 {
455         uint64_t buffer[(item_len + 7) / 8];
456         struct hlist_head *head;
457         struct rds_connection *conn;
458         size_t i;
459 
460         rcu_read_lock();
461 
462         lens->nr = 0;
463         lens->each = item_len;
464 
465         for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash);
466              i++, head++) {
467                 hlist_for_each_entry_rcu(conn, head, c_hash_node) {
468 
469                         /* XXX no c_lock usage.. */
470                         if (!visitor(conn, buffer))
471                                 continue;
472 
473                         /* We copy as much as we can fit in the buffer,
474                          * but we count all items so that the caller
475                          * can resize the buffer. */
476                         if (len >= item_len) {
477                                 rds_info_copy(iter, buffer, item_len);
478                                 len -= item_len;
479                         }
480                         lens->nr++;
481                 }
482         }
483         rcu_read_unlock();
484 }
485 EXPORT_SYMBOL_GPL(rds_for_each_conn_info);
486 
487 static int rds_conn_info_visitor(struct rds_connection *conn,
488                                   void *buffer)
489 {
490         struct rds_info_connection *cinfo = buffer;
491 
492         cinfo->next_tx_seq = conn->c_next_tx_seq;
493         cinfo->next_rx_seq = conn->c_next_rx_seq;
494         cinfo->laddr = conn->c_laddr;
495         cinfo->faddr = conn->c_faddr;
496         strncpy(cinfo->transport, conn->c_trans->t_name,
497                 sizeof(cinfo->transport));
498         cinfo->flags = 0;
499 
500         rds_conn_info_set(cinfo->flags, test_bit(RDS_IN_XMIT, &conn->c_flags),
501                           SENDING);
502         /* XXX Future: return the state rather than these funky bits */
503         rds_conn_info_set(cinfo->flags,
504                           atomic_read(&conn->c_state) == RDS_CONN_CONNECTING,
505                           CONNECTING);
506         rds_conn_info_set(cinfo->flags,
507                           atomic_read(&conn->c_state) == RDS_CONN_UP,
508                           CONNECTED);
509         return 1;
510 }
511 
512 static void rds_conn_info(struct socket *sock, unsigned int len,
513                           struct rds_info_iterator *iter,
514                           struct rds_info_lengths *lens)
515 {
516         rds_for_each_conn_info(sock, len, iter, lens,
517                                 rds_conn_info_visitor,
518                                 sizeof(struct rds_info_connection));
519 }
520 
521 int rds_conn_init(void)
522 {
523         rds_conn_slab = kmem_cache_create("rds_connection",
524                                           sizeof(struct rds_connection),
525                                           0, 0, NULL);
526         if (!rds_conn_slab)
527                 return -ENOMEM;
528 
529         rds_info_register_func(RDS_INFO_CONNECTIONS, rds_conn_info);
530         rds_info_register_func(RDS_INFO_SEND_MESSAGES,
531                                rds_conn_message_info_send);
532         rds_info_register_func(RDS_INFO_RETRANS_MESSAGES,
533                                rds_conn_message_info_retrans);
534 
535         return 0;
536 }
537 
538 void rds_conn_exit(void)
539 {
540         rds_loop_exit();
541 
542         WARN_ON(!hlist_empty(rds_conn_hash));
543 
544         kmem_cache_destroy(rds_conn_slab);
545 
546         rds_info_deregister_func(RDS_INFO_CONNECTIONS, rds_conn_info);
547         rds_info_deregister_func(RDS_INFO_SEND_MESSAGES,
548                                  rds_conn_message_info_send);
549         rds_info_deregister_func(RDS_INFO_RETRANS_MESSAGES,
550                                  rds_conn_message_info_retrans);
551 }
552 
553 /*
554  * Force a disconnect
555  */
556 void rds_conn_drop(struct rds_connection *conn)
557 {
558         atomic_set(&conn->c_state, RDS_CONN_ERROR);
559         queue_work(rds_wq, &conn->c_down_w);
560 }
561 EXPORT_SYMBOL_GPL(rds_conn_drop);
562 
563 /*
564  * If the connection is down, trigger a connect. We may have scheduled a
565  * delayed reconnect however - in this case we should not interfere.
566  */
567 void rds_conn_connect_if_down(struct rds_connection *conn)
568 {
569         if (rds_conn_state(conn) == RDS_CONN_DOWN &&
570             !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags))
571                 queue_delayed_work(rds_wq, &conn->c_conn_w, 0);
572 }
573 EXPORT_SYMBOL_GPL(rds_conn_connect_if_down);
574 
575 /*
576  * An error occurred on the connection
577  */
578 void
579 __rds_conn_error(struct rds_connection *conn, const char *fmt, ...)
580 {
581         va_list ap;
582 
583         va_start(ap, fmt);
584         vprintk(fmt, ap);
585         va_end(ap);
586 
587         rds_conn_drop(conn);
588 }
589 

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