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76
77#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
78
79#include <linux/slab.h>
80#include <linux/idr.h>
81#include <linux/timer.h>
82#include <linux/sched/signal.h>
83
84#include "ar-internal.h"
85
86__read_mostly unsigned int rxrpc_max_client_connections = 1000;
87__read_mostly unsigned int rxrpc_reap_client_connections = 900;
88__read_mostly unsigned int rxrpc_conn_idle_client_expiry = 2 * 60 * HZ;
89__read_mostly unsigned int rxrpc_conn_idle_client_fast_expiry = 2 * HZ;
90
91
92
93
94DEFINE_IDR(rxrpc_client_conn_ids);
95static DEFINE_SPINLOCK(rxrpc_conn_id_lock);
96
97static void rxrpc_cull_active_client_conns(struct rxrpc_net *);
98
99
100
101
102
103
104
105static int rxrpc_get_client_connection_id(struct rxrpc_connection *conn,
106 gfp_t gfp)
107{
108 struct rxrpc_net *rxnet = conn->params.local->rxnet;
109 int id;
110
111 _enter("");
112
113 idr_preload(gfp);
114 spin_lock(&rxrpc_conn_id_lock);
115
116 id = idr_alloc_cyclic(&rxrpc_client_conn_ids, conn,
117 1, 0x40000000, GFP_NOWAIT);
118 if (id < 0)
119 goto error;
120
121 spin_unlock(&rxrpc_conn_id_lock);
122 idr_preload_end();
123
124 conn->proto.epoch = rxnet->epoch;
125 conn->proto.cid = id << RXRPC_CIDSHIFT;
126 set_bit(RXRPC_CONN_HAS_IDR, &conn->flags);
127 _leave(" [CID %x]", conn->proto.cid);
128 return 0;
129
130error:
131 spin_unlock(&rxrpc_conn_id_lock);
132 idr_preload_end();
133 _leave(" = %d", id);
134 return id;
135}
136
137
138
139
140static void rxrpc_put_client_connection_id(struct rxrpc_connection *conn)
141{
142 if (test_bit(RXRPC_CONN_HAS_IDR, &conn->flags)) {
143 spin_lock(&rxrpc_conn_id_lock);
144 idr_remove(&rxrpc_client_conn_ids,
145 conn->proto.cid >> RXRPC_CIDSHIFT);
146 spin_unlock(&rxrpc_conn_id_lock);
147 }
148}
149
150
151
152
153void rxrpc_destroy_client_conn_ids(void)
154{
155 struct rxrpc_connection *conn;
156 int id;
157
158 if (!idr_is_empty(&rxrpc_client_conn_ids)) {
159 idr_for_each_entry(&rxrpc_client_conn_ids, conn, id) {
160 pr_err("AF_RXRPC: Leaked client conn %p {%d}\n",
161 conn, atomic_read(&conn->usage));
162 }
163 BUG();
164 }
165
166 idr_destroy(&rxrpc_client_conn_ids);
167}
168
169
170
171
172static struct rxrpc_connection *
173rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp)
174{
175 struct rxrpc_connection *conn;
176 struct rxrpc_net *rxnet = cp->local->rxnet;
177 int ret;
178
179 _enter("");
180
181 conn = rxrpc_alloc_connection(gfp);
182 if (!conn) {
183 _leave(" = -ENOMEM");
184 return ERR_PTR(-ENOMEM);
185 }
186
187 atomic_set(&conn->usage, 1);
188 if (cp->exclusive)
189 __set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
190 if (cp->upgrade)
191 __set_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags);
192
193 conn->params = *cp;
194 conn->out_clientflag = RXRPC_CLIENT_INITIATED;
195 conn->state = RXRPC_CONN_CLIENT;
196 conn->service_id = cp->service_id;
197
198 ret = rxrpc_get_client_connection_id(conn, gfp);
199 if (ret < 0)
200 goto error_0;
201
202 ret = rxrpc_init_client_conn_security(conn);
203 if (ret < 0)
204 goto error_1;
205
206 ret = conn->security->prime_packet_security(conn);
207 if (ret < 0)
208 goto error_2;
209
210 write_lock(&rxnet->conn_lock);
211 list_add_tail(&conn->proc_link, &rxnet->conn_proc_list);
212 write_unlock(&rxnet->conn_lock);
213
214
215 cp->peer = NULL;
216 rxrpc_get_local(conn->params.local);
217 key_get(conn->params.key);
218
219 trace_rxrpc_conn(conn, rxrpc_conn_new_client, atomic_read(&conn->usage),
220 __builtin_return_address(0));
221 trace_rxrpc_client(conn, -1, rxrpc_client_alloc);
222 _leave(" = %p", conn);
223 return conn;
224
225error_2:
226 conn->security->clear(conn);
227error_1:
228 rxrpc_put_client_connection_id(conn);
229error_0:
230 kfree(conn);
231 _leave(" = %d", ret);
232 return ERR_PTR(ret);
233}
234
235
236
237
238static bool rxrpc_may_reuse_conn(struct rxrpc_connection *conn)
239{
240 struct rxrpc_net *rxnet = conn->params.local->rxnet;
241 int id_cursor, id, distance, limit;
242
243 if (test_bit(RXRPC_CONN_DONT_REUSE, &conn->flags))
244 goto dont_reuse;
245
246 if (conn->proto.epoch != rxnet->epoch)
247 goto mark_dont_reuse;
248
249
250
251
252
253
254
255 id_cursor = idr_get_cursor(&rxrpc_client_conn_ids);
256 id = conn->proto.cid >> RXRPC_CIDSHIFT;
257 distance = id - id_cursor;
258 if (distance < 0)
259 distance = -distance;
260 limit = max(rxrpc_max_client_connections * 4, 1024U);
261 if (distance > limit)
262 goto mark_dont_reuse;
263
264 return true;
265
266mark_dont_reuse:
267 set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
268dont_reuse:
269 return false;
270}
271
272
273
274
275
276
277
278static int rxrpc_get_client_conn(struct rxrpc_call *call,
279 struct rxrpc_conn_parameters *cp,
280 struct sockaddr_rxrpc *srx,
281 gfp_t gfp)
282{
283 struct rxrpc_connection *conn, *candidate = NULL;
284 struct rxrpc_local *local = cp->local;
285 struct rb_node *p, **pp, *parent;
286 long diff;
287 int ret = -ENOMEM;
288
289 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
290
291 cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp);
292 if (!cp->peer)
293 goto error;
294
295 call->cong_cwnd = cp->peer->cong_cwnd;
296 if (call->cong_cwnd >= call->cong_ssthresh)
297 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
298 else
299 call->cong_mode = RXRPC_CALL_SLOW_START;
300
301
302
303
304 if (!cp->exclusive) {
305 _debug("search 1");
306 spin_lock(&local->client_conns_lock);
307 p = local->client_conns.rb_node;
308 while (p) {
309 conn = rb_entry(p, struct rxrpc_connection, client_node);
310
311#define cmp(X) ((long)conn->params.X - (long)cp->X)
312 diff = (cmp(peer) ?:
313 cmp(key) ?:
314 cmp(security_level) ?:
315 cmp(upgrade));
316#undef cmp
317 if (diff < 0) {
318 p = p->rb_left;
319 } else if (diff > 0) {
320 p = p->rb_right;
321 } else {
322 if (rxrpc_may_reuse_conn(conn) &&
323 rxrpc_get_connection_maybe(conn))
324 goto found_extant_conn;
325
326
327
328
329
330 break;
331 }
332 }
333 spin_unlock(&local->client_conns_lock);
334 }
335
336
337
338
339
340
341 _debug("new conn");
342 candidate = rxrpc_alloc_client_connection(cp, gfp);
343 if (IS_ERR(candidate)) {
344 ret = PTR_ERR(candidate);
345 goto error_peer;
346 }
347
348
349
350
351
352
353
354 list_add_tail(&call->chan_wait_link, &candidate->waiting_calls);
355
356 if (cp->exclusive) {
357 call->conn = candidate;
358 call->security_ix = candidate->security_ix;
359 call->service_id = candidate->service_id;
360 _leave(" = 0 [exclusive %d]", candidate->debug_id);
361 return 0;
362 }
363
364
365
366
367
368 _debug("search 2");
369 spin_lock(&local->client_conns_lock);
370
371 pp = &local->client_conns.rb_node;
372 parent = NULL;
373 while (*pp) {
374 parent = *pp;
375 conn = rb_entry(parent, struct rxrpc_connection, client_node);
376
377#define cmp(X) ((long)conn->params.X - (long)candidate->params.X)
378 diff = (cmp(peer) ?:
379 cmp(key) ?:
380 cmp(security_level) ?:
381 cmp(upgrade));
382#undef cmp
383 if (diff < 0) {
384 pp = &(*pp)->rb_left;
385 } else if (diff > 0) {
386 pp = &(*pp)->rb_right;
387 } else {
388 if (rxrpc_may_reuse_conn(conn) &&
389 rxrpc_get_connection_maybe(conn))
390 goto found_extant_conn;
391
392 _debug("replace conn");
393 clear_bit(RXRPC_CONN_IN_CLIENT_CONNS, &conn->flags);
394 rb_replace_node(&conn->client_node,
395 &candidate->client_node,
396 &local->client_conns);
397 trace_rxrpc_client(conn, -1, rxrpc_client_replace);
398 goto candidate_published;
399 }
400 }
401
402 _debug("new conn");
403 rb_link_node(&candidate->client_node, parent, pp);
404 rb_insert_color(&candidate->client_node, &local->client_conns);
405
406candidate_published:
407 set_bit(RXRPC_CONN_IN_CLIENT_CONNS, &candidate->flags);
408 call->conn = candidate;
409 call->security_ix = candidate->security_ix;
410 call->service_id = candidate->service_id;
411 spin_unlock(&local->client_conns_lock);
412 _leave(" = 0 [new %d]", candidate->debug_id);
413 return 0;
414
415
416
417
418
419found_extant_conn:
420 _debug("found conn");
421 spin_unlock(&local->client_conns_lock);
422
423 if (candidate) {
424 trace_rxrpc_client(candidate, -1, rxrpc_client_duplicate);
425 rxrpc_put_connection(candidate);
426 candidate = NULL;
427 }
428
429 spin_lock(&conn->channel_lock);
430 call->conn = conn;
431 call->security_ix = conn->security_ix;
432 call->service_id = conn->service_id;
433 list_add(&call->chan_wait_link, &conn->waiting_calls);
434 spin_unlock(&conn->channel_lock);
435 _leave(" = 0 [extant %d]", conn->debug_id);
436 return 0;
437
438error_peer:
439 rxrpc_put_peer(cp->peer);
440 cp->peer = NULL;
441error:
442 _leave(" = %d", ret);
443 return ret;
444}
445
446
447
448
449static void rxrpc_activate_conn(struct rxrpc_net *rxnet,
450 struct rxrpc_connection *conn)
451{
452 if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) {
453 trace_rxrpc_client(conn, -1, rxrpc_client_to_upgrade);
454 conn->cache_state = RXRPC_CONN_CLIENT_UPGRADE;
455 } else {
456 trace_rxrpc_client(conn, -1, rxrpc_client_to_active);
457 conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE;
458 }
459 rxnet->nr_active_client_conns++;
460 list_move_tail(&conn->cache_link, &rxnet->active_client_conns);
461}
462
463
464
465
466
467
468
469
470
471
472
473
474
475static void rxrpc_animate_client_conn(struct rxrpc_net *rxnet,
476 struct rxrpc_connection *conn)
477{
478 unsigned int nr_conns;
479
480 _enter("%d,%d", conn->debug_id, conn->cache_state);
481
482 if (conn->cache_state == RXRPC_CONN_CLIENT_ACTIVE ||
483 conn->cache_state == RXRPC_CONN_CLIENT_UPGRADE)
484 goto out;
485
486 spin_lock(&rxnet->client_conn_cache_lock);
487
488 nr_conns = rxnet->nr_client_conns;
489 if (!test_and_set_bit(RXRPC_CONN_COUNTED, &conn->flags)) {
490 trace_rxrpc_client(conn, -1, rxrpc_client_count);
491 rxnet->nr_client_conns = nr_conns + 1;
492 }
493
494 switch (conn->cache_state) {
495 case RXRPC_CONN_CLIENT_ACTIVE:
496 case RXRPC_CONN_CLIENT_UPGRADE:
497 case RXRPC_CONN_CLIENT_WAITING:
498 break;
499
500 case RXRPC_CONN_CLIENT_INACTIVE:
501 case RXRPC_CONN_CLIENT_CULLED:
502 case RXRPC_CONN_CLIENT_IDLE:
503 if (nr_conns >= rxrpc_max_client_connections)
504 goto wait_for_capacity;
505 goto activate_conn;
506
507 default:
508 BUG();
509 }
510
511out_unlock:
512 spin_unlock(&rxnet->client_conn_cache_lock);
513out:
514 _leave(" [%d]", conn->cache_state);
515 return;
516
517activate_conn:
518 _debug("activate");
519 rxrpc_activate_conn(rxnet, conn);
520 goto out_unlock;
521
522wait_for_capacity:
523 _debug("wait");
524 trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting);
525 conn->cache_state = RXRPC_CONN_CLIENT_WAITING;
526 list_move_tail(&conn->cache_link, &rxnet->waiting_client_conns);
527 goto out_unlock;
528}
529
530
531
532
533static void rxrpc_deactivate_one_channel(struct rxrpc_connection *conn,
534 unsigned int channel)
535{
536 struct rxrpc_channel *chan = &conn->channels[channel];
537
538 rcu_assign_pointer(chan->call, NULL);
539 conn->active_chans &= ~(1 << channel);
540}
541
542
543
544
545
546
547static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,
548 unsigned int channel)
549{
550 struct rxrpc_channel *chan = &conn->channels[channel];
551 struct rxrpc_call *call = list_entry(conn->waiting_calls.next,
552 struct rxrpc_call, chan_wait_link);
553 u32 call_id = chan->call_counter + 1;
554
555 trace_rxrpc_client(conn, channel, rxrpc_client_chan_activate);
556
557 write_lock_bh(&call->state_lock);
558 call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
559 write_unlock_bh(&call->state_lock);
560
561 rxrpc_see_call(call);
562 list_del_init(&call->chan_wait_link);
563 conn->active_chans |= 1 << channel;
564 call->peer = rxrpc_get_peer(conn->params.peer);
565 call->cid = conn->proto.cid | channel;
566 call->call_id = call_id;
567
568 trace_rxrpc_connect_call(call);
569 _net("CONNECT call %08x:%08x as call %d on conn %d",
570 call->cid, call->call_id, call->debug_id, conn->debug_id);
571
572
573
574
575
576
577
578
579
580
581
582 smp_wmb();
583 chan->call_id = call_id;
584 rcu_assign_pointer(chan->call, call);
585 wake_up(&call->waitq);
586}
587
588
589
590
591
592static void rxrpc_activate_channels_locked(struct rxrpc_connection *conn)
593{
594 u8 avail, mask;
595
596 switch (conn->cache_state) {
597 case RXRPC_CONN_CLIENT_ACTIVE:
598 mask = RXRPC_ACTIVE_CHANS_MASK;
599 break;
600 case RXRPC_CONN_CLIENT_UPGRADE:
601 mask = 0x01;
602 break;
603 default:
604 return;
605 }
606
607 while (!list_empty(&conn->waiting_calls) &&
608 (avail = ~conn->active_chans,
609 avail &= mask,
610 avail != 0))
611 rxrpc_activate_one_channel(conn, __ffs(avail));
612}
613
614
615
616
617static void rxrpc_activate_channels(struct rxrpc_connection *conn)
618{
619 _enter("%d", conn->debug_id);
620
621 trace_rxrpc_client(conn, -1, rxrpc_client_activate_chans);
622
623 if (conn->active_chans == RXRPC_ACTIVE_CHANS_MASK)
624 return;
625
626 spin_lock(&conn->channel_lock);
627 rxrpc_activate_channels_locked(conn);
628 spin_unlock(&conn->channel_lock);
629 _leave("");
630}
631
632
633
634
635static int rxrpc_wait_for_channel(struct rxrpc_call *call, gfp_t gfp)
636{
637 int ret = 0;
638
639 _enter("%d", call->debug_id);
640
641 if (!call->call_id) {
642 DECLARE_WAITQUEUE(myself, current);
643
644 if (!gfpflags_allow_blocking(gfp)) {
645 ret = -EAGAIN;
646 goto out;
647 }
648
649 add_wait_queue_exclusive(&call->waitq, &myself);
650 for (;;) {
651 set_current_state(TASK_INTERRUPTIBLE);
652 if (call->call_id)
653 break;
654 if (signal_pending(current)) {
655 ret = -ERESTARTSYS;
656 break;
657 }
658 schedule();
659 }
660 remove_wait_queue(&call->waitq, &myself);
661 __set_current_state(TASK_RUNNING);
662 }
663
664
665 smp_rmb();
666
667out:
668 _leave(" = %d", ret);
669 return ret;
670}
671
672
673
674
675
676int rxrpc_connect_call(struct rxrpc_call *call,
677 struct rxrpc_conn_parameters *cp,
678 struct sockaddr_rxrpc *srx,
679 gfp_t gfp)
680{
681 struct rxrpc_net *rxnet = cp->local->rxnet;
682 int ret;
683
684 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
685
686 rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper.work);
687 rxrpc_cull_active_client_conns(rxnet);
688
689 ret = rxrpc_get_client_conn(call, cp, srx, gfp);
690 if (ret < 0)
691 return ret;
692
693 rxrpc_animate_client_conn(rxnet, call->conn);
694 rxrpc_activate_channels(call->conn);
695
696 ret = rxrpc_wait_for_channel(call, gfp);
697 if (ret < 0)
698 rxrpc_disconnect_client_call(call);
699
700 _leave(" = %d", ret);
701 return ret;
702}
703
704
705
706
707
708
709
710
711static void rxrpc_expose_client_conn(struct rxrpc_connection *conn,
712 unsigned int channel)
713{
714 if (!test_and_set_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
715 trace_rxrpc_client(conn, channel, rxrpc_client_exposed);
716 rxrpc_get_connection(conn);
717 }
718}
719
720
721
722
723
724void rxrpc_expose_client_call(struct rxrpc_call *call)
725{
726 unsigned int channel = call->cid & RXRPC_CHANNELMASK;
727 struct rxrpc_connection *conn = call->conn;
728 struct rxrpc_channel *chan = &conn->channels[channel];
729
730 if (!test_and_set_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
731
732
733
734
735
736 chan->call_counter++;
737 if (chan->call_counter >= INT_MAX)
738 set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
739 rxrpc_expose_client_conn(conn, channel);
740 }
741}
742
743
744
745
746void rxrpc_disconnect_client_call(struct rxrpc_call *call)
747{
748 unsigned int channel = call->cid & RXRPC_CHANNELMASK;
749 struct rxrpc_connection *conn = call->conn;
750 struct rxrpc_channel *chan = &conn->channels[channel];
751 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&call->socket->sk));
752
753 trace_rxrpc_client(conn, channel, rxrpc_client_chan_disconnect);
754 call->conn = NULL;
755
756 spin_lock(&conn->channel_lock);
757
758
759
760
761
762 if (!list_empty(&call->chan_wait_link)) {
763 _debug("call is waiting");
764 ASSERTCMP(call->call_id, ==, 0);
765 ASSERT(!test_bit(RXRPC_CALL_EXPOSED, &call->flags));
766 list_del_init(&call->chan_wait_link);
767
768 trace_rxrpc_client(conn, channel, rxrpc_client_chan_unstarted);
769
770
771
772
773 spin_lock(&rxnet->client_conn_cache_lock);
774 if (conn->cache_state == RXRPC_CONN_CLIENT_WAITING &&
775 list_empty(&conn->waiting_calls) &&
776 !conn->active_chans)
777 goto idle_connection;
778 goto out;
779 }
780
781 ASSERTCMP(rcu_access_pointer(chan->call), ==, call);
782
783
784
785
786
787
788
789
790
791
792 if (test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
793 _debug("exposed %u,%u", call->call_id, call->abort_code);
794 __rxrpc_disconnect_call(conn, call);
795 }
796
797
798 if (conn->cache_state == RXRPC_CONN_CLIENT_ACTIVE &&
799 !list_empty(&conn->waiting_calls)) {
800 trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
801 rxrpc_activate_one_channel(conn, channel);
802 goto out_2;
803 }
804
805
806
807
808
809
810 spin_lock(&rxnet->client_conn_cache_lock);
811
812 switch (conn->cache_state) {
813 case RXRPC_CONN_CLIENT_UPGRADE:
814
815 if (test_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
816 clear_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags);
817 trace_rxrpc_client(conn, channel, rxrpc_client_to_active);
818 conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE;
819 rxrpc_activate_channels_locked(conn);
820 }
821
822 case RXRPC_CONN_CLIENT_ACTIVE:
823 if (list_empty(&conn->waiting_calls)) {
824 rxrpc_deactivate_one_channel(conn, channel);
825 if (!conn->active_chans) {
826 rxnet->nr_active_client_conns--;
827 goto idle_connection;
828 }
829 goto out;
830 }
831
832 trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
833 rxrpc_activate_one_channel(conn, channel);
834 goto out;
835
836 case RXRPC_CONN_CLIENT_CULLED:
837 rxrpc_deactivate_one_channel(conn, channel);
838 ASSERT(list_empty(&conn->waiting_calls));
839 if (!conn->active_chans)
840 goto idle_connection;
841 goto out;
842
843 case RXRPC_CONN_CLIENT_WAITING:
844 rxrpc_deactivate_one_channel(conn, channel);
845 goto out;
846
847 default:
848 BUG();
849 }
850
851out:
852 spin_unlock(&rxnet->client_conn_cache_lock);
853out_2:
854 spin_unlock(&conn->channel_lock);
855 rxrpc_put_connection(conn);
856 _leave("");
857 return;
858
859idle_connection:
860
861
862
863 if (test_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
864 trace_rxrpc_client(conn, channel, rxrpc_client_to_idle);
865 conn->idle_timestamp = jiffies;
866 conn->cache_state = RXRPC_CONN_CLIENT_IDLE;
867 list_move_tail(&conn->cache_link, &rxnet->idle_client_conns);
868 if (rxnet->idle_client_conns.next == &conn->cache_link &&
869 !rxnet->kill_all_client_conns)
870 queue_delayed_work(rxrpc_workqueue,
871 &rxnet->client_conn_reaper,
872 rxrpc_conn_idle_client_expiry);
873 } else {
874 trace_rxrpc_client(conn, channel, rxrpc_client_to_inactive);
875 conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
876 list_del_init(&conn->cache_link);
877 }
878 goto out;
879}
880
881
882
883
884static struct rxrpc_connection *
885rxrpc_put_one_client_conn(struct rxrpc_connection *conn)
886{
887 struct rxrpc_connection *next = NULL;
888 struct rxrpc_local *local = conn->params.local;
889 struct rxrpc_net *rxnet = local->rxnet;
890 unsigned int nr_conns;
891
892 trace_rxrpc_client(conn, -1, rxrpc_client_cleanup);
893
894 if (test_bit(RXRPC_CONN_IN_CLIENT_CONNS, &conn->flags)) {
895 spin_lock(&local->client_conns_lock);
896 if (test_and_clear_bit(RXRPC_CONN_IN_CLIENT_CONNS,
897 &conn->flags))
898 rb_erase(&conn->client_node, &local->client_conns);
899 spin_unlock(&local->client_conns_lock);
900 }
901
902 rxrpc_put_client_connection_id(conn);
903
904 ASSERTCMP(conn->cache_state, ==, RXRPC_CONN_CLIENT_INACTIVE);
905
906 if (test_bit(RXRPC_CONN_COUNTED, &conn->flags)) {
907 trace_rxrpc_client(conn, -1, rxrpc_client_uncount);
908 spin_lock(&rxnet->client_conn_cache_lock);
909 nr_conns = --rxnet->nr_client_conns;
910
911 if (nr_conns < rxrpc_max_client_connections &&
912 !list_empty(&rxnet->waiting_client_conns)) {
913 next = list_entry(rxnet->waiting_client_conns.next,
914 struct rxrpc_connection, cache_link);
915 rxrpc_get_connection(next);
916 rxrpc_activate_conn(rxnet, next);
917 }
918
919 spin_unlock(&rxnet->client_conn_cache_lock);
920 }
921
922 rxrpc_kill_connection(conn);
923 if (next)
924 rxrpc_activate_channels(next);
925
926
927
928
929 return next;
930}
931
932
933
934
935void rxrpc_put_client_conn(struct rxrpc_connection *conn)
936{
937 const void *here = __builtin_return_address(0);
938 int n;
939
940 do {
941 n = atomic_dec_return(&conn->usage);
942 trace_rxrpc_conn(conn, rxrpc_conn_put_client, n, here);
943 if (n > 0)
944 return;
945 ASSERTCMP(n, >=, 0);
946
947 conn = rxrpc_put_one_client_conn(conn);
948 } while (conn);
949}
950
951
952
953
954static void rxrpc_cull_active_client_conns(struct rxrpc_net *rxnet)
955{
956 struct rxrpc_connection *conn;
957 unsigned int nr_conns = rxnet->nr_client_conns;
958 unsigned int nr_active, limit;
959
960 _enter("");
961
962 ASSERTCMP(nr_conns, >=, 0);
963 if (nr_conns < rxrpc_max_client_connections) {
964 _leave(" [ok]");
965 return;
966 }
967 limit = rxrpc_reap_client_connections;
968
969 spin_lock(&rxnet->client_conn_cache_lock);
970 nr_active = rxnet->nr_active_client_conns;
971
972 while (nr_active > limit) {
973 ASSERT(!list_empty(&rxnet->active_client_conns));
974 conn = list_entry(rxnet->active_client_conns.next,
975 struct rxrpc_connection, cache_link);
976 ASSERTIFCMP(conn->cache_state != RXRPC_CONN_CLIENT_ACTIVE,
977 conn->cache_state, ==, RXRPC_CONN_CLIENT_UPGRADE);
978
979 if (list_empty(&conn->waiting_calls)) {
980 trace_rxrpc_client(conn, -1, rxrpc_client_to_culled);
981 conn->cache_state = RXRPC_CONN_CLIENT_CULLED;
982 list_del_init(&conn->cache_link);
983 } else {
984 trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting);
985 conn->cache_state = RXRPC_CONN_CLIENT_WAITING;
986 list_move_tail(&conn->cache_link,
987 &rxnet->waiting_client_conns);
988 }
989
990 nr_active--;
991 }
992
993 rxnet->nr_active_client_conns = nr_active;
994 spin_unlock(&rxnet->client_conn_cache_lock);
995 ASSERTCMP(nr_active, >=, 0);
996 _leave(" [culled]");
997}
998
999
1000
1001
1002
1003
1004
1005
1006void rxrpc_discard_expired_client_conns(struct work_struct *work)
1007{
1008 struct rxrpc_connection *conn;
1009 struct rxrpc_net *rxnet =
1010 container_of(to_delayed_work(work),
1011 struct rxrpc_net, client_conn_reaper);
1012 unsigned long expiry, conn_expires_at, now;
1013 unsigned int nr_conns;
1014 bool did_discard = false;
1015
1016 _enter("");
1017
1018 if (list_empty(&rxnet->idle_client_conns)) {
1019 _leave(" [empty]");
1020 return;
1021 }
1022
1023
1024 if (!spin_trylock(&rxnet->client_conn_discard_lock)) {
1025 _leave(" [already]");
1026 return;
1027 }
1028
1029
1030
1031
1032 nr_conns = rxnet->nr_client_conns;
1033
1034next:
1035 spin_lock(&rxnet->client_conn_cache_lock);
1036
1037 if (list_empty(&rxnet->idle_client_conns))
1038 goto out;
1039
1040 conn = list_entry(rxnet->idle_client_conns.next,
1041 struct rxrpc_connection, cache_link);
1042 ASSERT(test_bit(RXRPC_CONN_EXPOSED, &conn->flags));
1043
1044 if (!rxnet->kill_all_client_conns) {
1045
1046
1047
1048
1049
1050 expiry = rxrpc_conn_idle_client_expiry;
1051 if (nr_conns > rxrpc_reap_client_connections)
1052 expiry = rxrpc_conn_idle_client_fast_expiry;
1053
1054 conn_expires_at = conn->idle_timestamp + expiry;
1055
1056 now = READ_ONCE(jiffies);
1057 if (time_after(conn_expires_at, now))
1058 goto not_yet_expired;
1059 }
1060
1061 trace_rxrpc_client(conn, -1, rxrpc_client_discard);
1062 if (!test_and_clear_bit(RXRPC_CONN_EXPOSED, &conn->flags))
1063 BUG();
1064 conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
1065 list_del_init(&conn->cache_link);
1066
1067 spin_unlock(&rxnet->client_conn_cache_lock);
1068
1069
1070
1071
1072
1073 rxrpc_put_connection(conn);
1074 did_discard = true;
1075 nr_conns--;
1076 goto next;
1077
1078not_yet_expired:
1079
1080
1081
1082
1083
1084
1085
1086 _debug("not yet");
1087 if (!rxnet->kill_all_client_conns)
1088 queue_delayed_work(rxrpc_workqueue,
1089 &rxnet->client_conn_reaper,
1090 conn_expires_at - now);
1091
1092out:
1093 spin_unlock(&rxnet->client_conn_cache_lock);
1094 spin_unlock(&rxnet->client_conn_discard_lock);
1095 _leave("");
1096}
1097
1098
1099
1100
1101
1102void rxrpc_destroy_all_client_connections(struct rxrpc_net *rxnet)
1103{
1104 _enter("");
1105
1106 spin_lock(&rxnet->client_conn_cache_lock);
1107 rxnet->kill_all_client_conns = true;
1108 spin_unlock(&rxnet->client_conn_cache_lock);
1109
1110 cancel_delayed_work(&rxnet->client_conn_reaper);
1111
1112 if (!queue_delayed_work(rxrpc_workqueue, &rxnet->client_conn_reaper, 0))
1113 _debug("destroy: queue failed");
1114
1115 _leave("");
1116}
1117