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

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ 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 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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