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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 long rxrpc_conn_idle_client_expiry = 2 * 60 * HZ;
89__read_mostly unsigned long 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 atomic_inc(&rxnet->nr_conns);
211 write_lock(&rxnet->conn_lock);
212 list_add_tail(&conn->proc_link, &rxnet->conn_proc_list);
213 write_unlock(&rxnet->conn_lock);
214
215
216 cp->peer = NULL;
217 rxrpc_get_local(conn->params.local);
218 key_get(conn->params.key);
219
220 trace_rxrpc_conn(conn, rxrpc_conn_new_client, atomic_read(&conn->usage),
221 __builtin_return_address(0));
222 trace_rxrpc_client(conn, -1, rxrpc_client_alloc);
223 _leave(" = %p", conn);
224 return conn;
225
226error_2:
227 conn->security->clear(conn);
228error_1:
229 rxrpc_put_client_connection_id(conn);
230error_0:
231 kfree(conn);
232 _leave(" = %d", ret);
233 return ERR_PTR(ret);
234}
235
236
237
238
239static bool rxrpc_may_reuse_conn(struct rxrpc_connection *conn)
240{
241 struct rxrpc_net *rxnet = conn->params.local->rxnet;
242 int id_cursor, id, distance, limit;
243
244 if (test_bit(RXRPC_CONN_DONT_REUSE, &conn->flags))
245 goto dont_reuse;
246
247 if (conn->proto.epoch != rxnet->epoch)
248 goto mark_dont_reuse;
249
250
251
252
253
254
255
256 id_cursor = idr_get_cursor(&rxrpc_client_conn_ids);
257 id = conn->proto.cid >> RXRPC_CIDSHIFT;
258 distance = id - id_cursor;
259 if (distance < 0)
260 distance = -distance;
261 limit = max(rxrpc_max_client_connections * 4, 1024U);
262 if (distance > limit)
263 goto mark_dont_reuse;
264
265 return true;
266
267mark_dont_reuse:
268 set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
269dont_reuse:
270 return false;
271}
272
273
274
275
276
277
278
279static int rxrpc_get_client_conn(struct rxrpc_call *call,
280 struct rxrpc_conn_parameters *cp,
281 struct sockaddr_rxrpc *srx,
282 gfp_t gfp)
283{
284 struct rxrpc_connection *conn, *candidate = NULL;
285 struct rxrpc_local *local = cp->local;
286 struct rb_node *p, **pp, *parent;
287 long diff;
288 int ret = -ENOMEM;
289
290 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
291
292 cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp);
293 if (!cp->peer)
294 goto error;
295
296 call->cong_cwnd = cp->peer->cong_cwnd;
297 if (call->cong_cwnd >= call->cong_ssthresh)
298 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
299 else
300 call->cong_mode = RXRPC_CALL_SLOW_START;
301
302
303
304
305 if (!cp->exclusive) {
306 _debug("search 1");
307 spin_lock(&local->client_conns_lock);
308 p = local->client_conns.rb_node;
309 while (p) {
310 conn = rb_entry(p, struct rxrpc_connection, client_node);
311
312#define cmp(X) ((long)conn->params.X - (long)cp->X)
313 diff = (cmp(peer) ?:
314 cmp(key) ?:
315 cmp(security_level) ?:
316 cmp(upgrade));
317#undef cmp
318 if (diff < 0) {
319 p = p->rb_left;
320 } else if (diff > 0) {
321 p = p->rb_right;
322 } else {
323 if (rxrpc_may_reuse_conn(conn) &&
324 rxrpc_get_connection_maybe(conn))
325 goto found_extant_conn;
326
327
328
329
330
331 break;
332 }
333 }
334 spin_unlock(&local->client_conns_lock);
335 }
336
337
338
339
340
341
342 _debug("new conn");
343 candidate = rxrpc_alloc_client_connection(cp, gfp);
344 if (IS_ERR(candidate)) {
345 ret = PTR_ERR(candidate);
346 goto error_peer;
347 }
348
349
350
351
352
353
354
355 list_add_tail(&call->chan_wait_link, &candidate->waiting_calls);
356
357 if (cp->exclusive) {
358 call->conn = candidate;
359 call->security_ix = candidate->security_ix;
360 call->service_id = candidate->service_id;
361 _leave(" = 0 [exclusive %d]", candidate->debug_id);
362 return 0;
363 }
364
365
366
367
368
369 _debug("search 2");
370 spin_lock(&local->client_conns_lock);
371
372 pp = &local->client_conns.rb_node;
373 parent = NULL;
374 while (*pp) {
375 parent = *pp;
376 conn = rb_entry(parent, struct rxrpc_connection, client_node);
377
378#define cmp(X) ((long)conn->params.X - (long)candidate->params.X)
379 diff = (cmp(peer) ?:
380 cmp(key) ?:
381 cmp(security_level) ?:
382 cmp(upgrade));
383#undef cmp
384 if (diff < 0) {
385 pp = &(*pp)->rb_left;
386 } else if (diff > 0) {
387 pp = &(*pp)->rb_right;
388 } else {
389 if (rxrpc_may_reuse_conn(conn) &&
390 rxrpc_get_connection_maybe(conn))
391 goto found_extant_conn;
392
393 _debug("replace conn");
394 clear_bit(RXRPC_CONN_IN_CLIENT_CONNS, &conn->flags);
395 rb_replace_node(&conn->client_node,
396 &candidate->client_node,
397 &local->client_conns);
398 trace_rxrpc_client(conn, -1, rxrpc_client_replace);
399 goto candidate_published;
400 }
401 }
402
403 _debug("new conn");
404 rb_link_node(&candidate->client_node, parent, pp);
405 rb_insert_color(&candidate->client_node, &local->client_conns);
406
407candidate_published:
408 set_bit(RXRPC_CONN_IN_CLIENT_CONNS, &candidate->flags);
409 call->conn = candidate;
410 call->security_ix = candidate->security_ix;
411 call->service_id = candidate->service_id;
412 spin_unlock(&local->client_conns_lock);
413 _leave(" = 0 [new %d]", candidate->debug_id);
414 return 0;
415
416
417
418
419
420found_extant_conn:
421 _debug("found conn");
422 spin_unlock(&local->client_conns_lock);
423
424 if (candidate) {
425 trace_rxrpc_client(candidate, -1, rxrpc_client_duplicate);
426 rxrpc_put_connection(candidate);
427 candidate = NULL;
428 }
429
430 spin_lock(&conn->channel_lock);
431 call->conn = conn;
432 call->security_ix = conn->security_ix;
433 call->service_id = conn->service_id;
434 list_add(&call->chan_wait_link, &conn->waiting_calls);
435 spin_unlock(&conn->channel_lock);
436 _leave(" = 0 [extant %d]", conn->debug_id);
437 return 0;
438
439error_peer:
440 rxrpc_put_peer(cp->peer);
441 cp->peer = NULL;
442error:
443 _leave(" = %d", ret);
444 return ret;
445}
446
447
448
449
450static void rxrpc_activate_conn(struct rxrpc_net *rxnet,
451 struct rxrpc_connection *conn)
452{
453 if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) {
454 trace_rxrpc_client(conn, -1, rxrpc_client_to_upgrade);
455 conn->cache_state = RXRPC_CONN_CLIENT_UPGRADE;
456 } else {
457 trace_rxrpc_client(conn, -1, rxrpc_client_to_active);
458 conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE;
459 }
460 rxnet->nr_active_client_conns++;
461 list_move_tail(&conn->cache_link, &rxnet->active_client_conns);
462}
463
464
465
466
467
468
469
470
471
472
473
474
475
476static void rxrpc_animate_client_conn(struct rxrpc_net *rxnet,
477 struct rxrpc_connection *conn)
478{
479 unsigned int nr_conns;
480
481 _enter("%d,%d", conn->debug_id, conn->cache_state);
482
483 if (conn->cache_state == RXRPC_CONN_CLIENT_ACTIVE ||
484 conn->cache_state == RXRPC_CONN_CLIENT_UPGRADE)
485 goto out;
486
487 spin_lock(&rxnet->client_conn_cache_lock);
488
489 nr_conns = rxnet->nr_client_conns;
490 if (!test_and_set_bit(RXRPC_CONN_COUNTED, &conn->flags)) {
491 trace_rxrpc_client(conn, -1, rxrpc_client_count);
492 rxnet->nr_client_conns = nr_conns + 1;
493 }
494
495 switch (conn->cache_state) {
496 case RXRPC_CONN_CLIENT_ACTIVE:
497 case RXRPC_CONN_CLIENT_UPGRADE:
498 case RXRPC_CONN_CLIENT_WAITING:
499 break;
500
501 case RXRPC_CONN_CLIENT_INACTIVE:
502 case RXRPC_CONN_CLIENT_CULLED:
503 case RXRPC_CONN_CLIENT_IDLE:
504 if (nr_conns >= rxrpc_max_client_connections)
505 goto wait_for_capacity;
506 goto activate_conn;
507
508 default:
509 BUG();
510 }
511
512out_unlock:
513 spin_unlock(&rxnet->client_conn_cache_lock);
514out:
515 _leave(" [%d]", conn->cache_state);
516 return;
517
518activate_conn:
519 _debug("activate");
520 rxrpc_activate_conn(rxnet, conn);
521 goto out_unlock;
522
523wait_for_capacity:
524 _debug("wait");
525 trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting);
526 conn->cache_state = RXRPC_CONN_CLIENT_WAITING;
527 list_move_tail(&conn->cache_link, &rxnet->waiting_client_conns);
528 goto out_unlock;
529}
530
531
532
533
534static void rxrpc_deactivate_one_channel(struct rxrpc_connection *conn,
535 unsigned int channel)
536{
537 struct rxrpc_channel *chan = &conn->channels[channel];
538
539 rcu_assign_pointer(chan->call, NULL);
540 conn->active_chans &= ~(1 << channel);
541}
542
543
544
545
546
547
548static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,
549 unsigned int channel)
550{
551 struct rxrpc_channel *chan = &conn->channels[channel];
552 struct rxrpc_call *call = list_entry(conn->waiting_calls.next,
553 struct rxrpc_call, chan_wait_link);
554 u32 call_id = chan->call_counter + 1;
555
556 trace_rxrpc_client(conn, channel, rxrpc_client_chan_activate);
557
558
559
560
561 clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
562
563 write_lock_bh(&call->state_lock);
564 if (!test_bit(RXRPC_CALL_TX_LASTQ, &call->flags))
565 call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
566 else
567 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
568 write_unlock_bh(&call->state_lock);
569
570 rxrpc_see_call(call);
571 list_del_init(&call->chan_wait_link);
572 conn->active_chans |= 1 << channel;
573 call->peer = rxrpc_get_peer(conn->params.peer);
574 call->cid = conn->proto.cid | channel;
575 call->call_id = call_id;
576
577 trace_rxrpc_connect_call(call);
578 _net("CONNECT call %08x:%08x as call %d on conn %d",
579 call->cid, call->call_id, call->debug_id, conn->debug_id);
580
581
582
583
584
585
586
587
588
589
590
591 smp_wmb();
592 chan->call_id = call_id;
593 rcu_assign_pointer(chan->call, call);
594 wake_up(&call->waitq);
595}
596
597
598
599
600
601static void rxrpc_activate_channels_locked(struct rxrpc_connection *conn)
602{
603 u8 avail, mask;
604
605 switch (conn->cache_state) {
606 case RXRPC_CONN_CLIENT_ACTIVE:
607 mask = RXRPC_ACTIVE_CHANS_MASK;
608 break;
609 case RXRPC_CONN_CLIENT_UPGRADE:
610 mask = 0x01;
611 break;
612 default:
613 return;
614 }
615
616 while (!list_empty(&conn->waiting_calls) &&
617 (avail = ~conn->active_chans,
618 avail &= mask,
619 avail != 0))
620 rxrpc_activate_one_channel(conn, __ffs(avail));
621}
622
623
624
625
626static void rxrpc_activate_channels(struct rxrpc_connection *conn)
627{
628 _enter("%d", conn->debug_id);
629
630 trace_rxrpc_client(conn, -1, rxrpc_client_activate_chans);
631
632 if (conn->active_chans == RXRPC_ACTIVE_CHANS_MASK)
633 return;
634
635 spin_lock(&conn->channel_lock);
636 rxrpc_activate_channels_locked(conn);
637 spin_unlock(&conn->channel_lock);
638 _leave("");
639}
640
641
642
643
644static int rxrpc_wait_for_channel(struct rxrpc_call *call, gfp_t gfp)
645{
646 int ret = 0;
647
648 _enter("%d", call->debug_id);
649
650 if (!call->call_id) {
651 DECLARE_WAITQUEUE(myself, current);
652
653 if (!gfpflags_allow_blocking(gfp)) {
654 ret = -EAGAIN;
655 goto out;
656 }
657
658 add_wait_queue_exclusive(&call->waitq, &myself);
659 for (;;) {
660 set_current_state(TASK_INTERRUPTIBLE);
661 if (call->call_id)
662 break;
663 if (signal_pending(current)) {
664 ret = -ERESTARTSYS;
665 break;
666 }
667 schedule();
668 }
669 remove_wait_queue(&call->waitq, &myself);
670 __set_current_state(TASK_RUNNING);
671 }
672
673
674 smp_rmb();
675
676out:
677 _leave(" = %d", ret);
678 return ret;
679}
680
681
682
683
684
685int rxrpc_connect_call(struct rxrpc_call *call,
686 struct rxrpc_conn_parameters *cp,
687 struct sockaddr_rxrpc *srx,
688 gfp_t gfp)
689{
690 struct rxrpc_net *rxnet = cp->local->rxnet;
691 int ret;
692
693 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
694
695 rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper);
696 rxrpc_cull_active_client_conns(rxnet);
697
698 ret = rxrpc_get_client_conn(call, cp, srx, gfp);
699 if (ret < 0)
700 goto out;
701
702 rxrpc_animate_client_conn(rxnet, call->conn);
703 rxrpc_activate_channels(call->conn);
704
705 ret = rxrpc_wait_for_channel(call, gfp);
706 if (ret < 0) {
707 rxrpc_disconnect_client_call(call);
708 goto out;
709 }
710
711 spin_lock_bh(&call->conn->params.peer->lock);
712 hlist_add_head(&call->error_link,
713 &call->conn->params.peer->error_targets);
714 spin_unlock_bh(&call->conn->params.peer->lock);
715
716out:
717 _leave(" = %d", ret);
718 return ret;
719}
720
721
722
723
724
725
726
727
728static void rxrpc_expose_client_conn(struct rxrpc_connection *conn,
729 unsigned int channel)
730{
731 if (!test_and_set_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
732 trace_rxrpc_client(conn, channel, rxrpc_client_exposed);
733 rxrpc_get_connection(conn);
734 }
735}
736
737
738
739
740
741void rxrpc_expose_client_call(struct rxrpc_call *call)
742{
743 unsigned int channel = call->cid & RXRPC_CHANNELMASK;
744 struct rxrpc_connection *conn = call->conn;
745 struct rxrpc_channel *chan = &conn->channels[channel];
746
747 if (!test_and_set_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
748
749
750
751
752
753 chan->call_counter++;
754 if (chan->call_counter >= INT_MAX)
755 set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
756 rxrpc_expose_client_conn(conn, channel);
757 }
758}
759
760
761
762
763static void rxrpc_set_client_reap_timer(struct rxrpc_net *rxnet)
764{
765 unsigned long now = jiffies;
766 unsigned long reap_at = now + rxrpc_conn_idle_client_expiry;
767
768 if (rxnet->live)
769 timer_reduce(&rxnet->client_conn_reap_timer, reap_at);
770}
771
772
773
774
775void rxrpc_disconnect_client_call(struct rxrpc_call *call)
776{
777 unsigned int channel = call->cid & RXRPC_CHANNELMASK;
778 struct rxrpc_connection *conn = call->conn;
779 struct rxrpc_channel *chan = &conn->channels[channel];
780 struct rxrpc_net *rxnet = conn->params.local->rxnet;
781
782 trace_rxrpc_client(conn, channel, rxrpc_client_chan_disconnect);
783 call->conn = NULL;
784
785 spin_lock(&conn->channel_lock);
786
787
788
789
790
791 if (!list_empty(&call->chan_wait_link)) {
792 _debug("call is waiting");
793 ASSERTCMP(call->call_id, ==, 0);
794 ASSERT(!test_bit(RXRPC_CALL_EXPOSED, &call->flags));
795 list_del_init(&call->chan_wait_link);
796
797 trace_rxrpc_client(conn, channel, rxrpc_client_chan_unstarted);
798
799
800
801
802 spin_lock(&rxnet->client_conn_cache_lock);
803 if (conn->cache_state == RXRPC_CONN_CLIENT_WAITING &&
804 list_empty(&conn->waiting_calls) &&
805 !conn->active_chans)
806 goto idle_connection;
807 goto out;
808 }
809
810 ASSERTCMP(rcu_access_pointer(chan->call), ==, call);
811
812
813
814
815
816
817
818
819
820
821 if (test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
822 _debug("exposed %u,%u", call->call_id, call->abort_code);
823 __rxrpc_disconnect_call(conn, call);
824 }
825
826
827 if (conn->cache_state == RXRPC_CONN_CLIENT_ACTIVE &&
828 !list_empty(&conn->waiting_calls)) {
829 trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
830 rxrpc_activate_one_channel(conn, channel);
831 goto out_2;
832 }
833
834
835
836
837
838 if (call->completion == RXRPC_CALL_SUCCEEDED &&
839 test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
840 unsigned long final_ack_at = jiffies + 2;
841
842 WRITE_ONCE(chan->final_ack_at, final_ack_at);
843 smp_wmb();
844 set_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
845 rxrpc_reduce_conn_timer(conn, final_ack_at);
846 }
847
848
849
850
851
852
853 spin_lock(&rxnet->client_conn_cache_lock);
854
855 switch (conn->cache_state) {
856 case RXRPC_CONN_CLIENT_UPGRADE:
857
858 if (test_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
859 clear_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags);
860 trace_rxrpc_client(conn, channel, rxrpc_client_to_active);
861 conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE;
862 rxrpc_activate_channels_locked(conn);
863 }
864
865 case RXRPC_CONN_CLIENT_ACTIVE:
866 if (list_empty(&conn->waiting_calls)) {
867 rxrpc_deactivate_one_channel(conn, channel);
868 if (!conn->active_chans) {
869 rxnet->nr_active_client_conns--;
870 goto idle_connection;
871 }
872 goto out;
873 }
874
875 trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
876 rxrpc_activate_one_channel(conn, channel);
877 goto out;
878
879 case RXRPC_CONN_CLIENT_CULLED:
880 rxrpc_deactivate_one_channel(conn, channel);
881 ASSERT(list_empty(&conn->waiting_calls));
882 if (!conn->active_chans)
883 goto idle_connection;
884 goto out;
885
886 case RXRPC_CONN_CLIENT_WAITING:
887 rxrpc_deactivate_one_channel(conn, channel);
888 goto out;
889
890 default:
891 BUG();
892 }
893
894out:
895 spin_unlock(&rxnet->client_conn_cache_lock);
896out_2:
897 spin_unlock(&conn->channel_lock);
898 rxrpc_put_connection(conn);
899 _leave("");
900 return;
901
902idle_connection:
903
904
905
906 if (test_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
907 trace_rxrpc_client(conn, channel, rxrpc_client_to_idle);
908 conn->idle_timestamp = jiffies;
909 conn->cache_state = RXRPC_CONN_CLIENT_IDLE;
910 list_move_tail(&conn->cache_link, &rxnet->idle_client_conns);
911 if (rxnet->idle_client_conns.next == &conn->cache_link &&
912 !rxnet->kill_all_client_conns)
913 rxrpc_set_client_reap_timer(rxnet);
914 } else {
915 trace_rxrpc_client(conn, channel, rxrpc_client_to_inactive);
916 conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
917 list_del_init(&conn->cache_link);
918 }
919 goto out;
920}
921
922
923
924
925static struct rxrpc_connection *
926rxrpc_put_one_client_conn(struct rxrpc_connection *conn)
927{
928 struct rxrpc_connection *next = NULL;
929 struct rxrpc_local *local = conn->params.local;
930 struct rxrpc_net *rxnet = local->rxnet;
931 unsigned int nr_conns;
932
933 trace_rxrpc_client(conn, -1, rxrpc_client_cleanup);
934
935 if (test_bit(RXRPC_CONN_IN_CLIENT_CONNS, &conn->flags)) {
936 spin_lock(&local->client_conns_lock);
937 if (test_and_clear_bit(RXRPC_CONN_IN_CLIENT_CONNS,
938 &conn->flags))
939 rb_erase(&conn->client_node, &local->client_conns);
940 spin_unlock(&local->client_conns_lock);
941 }
942
943 rxrpc_put_client_connection_id(conn);
944
945 ASSERTCMP(conn->cache_state, ==, RXRPC_CONN_CLIENT_INACTIVE);
946
947 if (test_bit(RXRPC_CONN_COUNTED, &conn->flags)) {
948 trace_rxrpc_client(conn, -1, rxrpc_client_uncount);
949 spin_lock(&rxnet->client_conn_cache_lock);
950 nr_conns = --rxnet->nr_client_conns;
951
952 if (nr_conns < rxrpc_max_client_connections &&
953 !list_empty(&rxnet->waiting_client_conns)) {
954 next = list_entry(rxnet->waiting_client_conns.next,
955 struct rxrpc_connection, cache_link);
956 rxrpc_get_connection(next);
957 rxrpc_activate_conn(rxnet, next);
958 }
959
960 spin_unlock(&rxnet->client_conn_cache_lock);
961 }
962
963 rxrpc_kill_connection(conn);
964 if (next)
965 rxrpc_activate_channels(next);
966
967
968
969
970 return next;
971}
972
973
974
975
976void rxrpc_put_client_conn(struct rxrpc_connection *conn)
977{
978 const void *here = __builtin_return_address(0);
979 int n;
980
981 do {
982 n = atomic_dec_return(&conn->usage);
983 trace_rxrpc_conn(conn, rxrpc_conn_put_client, n, here);
984 if (n > 0)
985 return;
986 ASSERTCMP(n, >=, 0);
987
988 conn = rxrpc_put_one_client_conn(conn);
989 } while (conn);
990}
991
992
993
994
995static void rxrpc_cull_active_client_conns(struct rxrpc_net *rxnet)
996{
997 struct rxrpc_connection *conn;
998 unsigned int nr_conns = rxnet->nr_client_conns;
999 unsigned int nr_active, limit;
1000
1001 _enter("");
1002
1003 ASSERTCMP(nr_conns, >=, 0);
1004 if (nr_conns < rxrpc_max_client_connections) {
1005 _leave(" [ok]");
1006 return;
1007 }
1008 limit = rxrpc_reap_client_connections;
1009
1010 spin_lock(&rxnet->client_conn_cache_lock);
1011 nr_active = rxnet->nr_active_client_conns;
1012
1013 while (nr_active > limit) {
1014 ASSERT(!list_empty(&rxnet->active_client_conns));
1015 conn = list_entry(rxnet->active_client_conns.next,
1016 struct rxrpc_connection, cache_link);
1017 ASSERTIFCMP(conn->cache_state != RXRPC_CONN_CLIENT_ACTIVE,
1018 conn->cache_state, ==, RXRPC_CONN_CLIENT_UPGRADE);
1019
1020 if (list_empty(&conn->waiting_calls)) {
1021 trace_rxrpc_client(conn, -1, rxrpc_client_to_culled);
1022 conn->cache_state = RXRPC_CONN_CLIENT_CULLED;
1023 list_del_init(&conn->cache_link);
1024 } else {
1025 trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting);
1026 conn->cache_state = RXRPC_CONN_CLIENT_WAITING;
1027 list_move_tail(&conn->cache_link,
1028 &rxnet->waiting_client_conns);
1029 }
1030
1031 nr_active--;
1032 }
1033
1034 rxnet->nr_active_client_conns = nr_active;
1035 spin_unlock(&rxnet->client_conn_cache_lock);
1036 ASSERTCMP(nr_active, >=, 0);
1037 _leave(" [culled]");
1038}
1039
1040
1041
1042
1043
1044
1045
1046
1047void rxrpc_discard_expired_client_conns(struct work_struct *work)
1048{
1049 struct rxrpc_connection *conn;
1050 struct rxrpc_net *rxnet =
1051 container_of(work, struct rxrpc_net, client_conn_reaper);
1052 unsigned long expiry, conn_expires_at, now;
1053 unsigned int nr_conns;
1054 bool did_discard = false;
1055
1056 _enter("");
1057
1058 if (list_empty(&rxnet->idle_client_conns)) {
1059 _leave(" [empty]");
1060 return;
1061 }
1062
1063
1064 if (!spin_trylock(&rxnet->client_conn_discard_lock)) {
1065 _leave(" [already]");
1066 return;
1067 }
1068
1069
1070
1071
1072 nr_conns = rxnet->nr_client_conns;
1073
1074next:
1075 spin_lock(&rxnet->client_conn_cache_lock);
1076
1077 if (list_empty(&rxnet->idle_client_conns))
1078 goto out;
1079
1080 conn = list_entry(rxnet->idle_client_conns.next,
1081 struct rxrpc_connection, cache_link);
1082 ASSERT(test_bit(RXRPC_CONN_EXPOSED, &conn->flags));
1083
1084 if (!rxnet->kill_all_client_conns) {
1085
1086
1087
1088
1089
1090 expiry = rxrpc_conn_idle_client_expiry;
1091 if (nr_conns > rxrpc_reap_client_connections)
1092 expiry = rxrpc_conn_idle_client_fast_expiry;
1093 if (conn->params.local->service_closed)
1094 expiry = rxrpc_closed_conn_expiry * HZ;
1095
1096 conn_expires_at = conn->idle_timestamp + expiry;
1097
1098 now = READ_ONCE(jiffies);
1099 if (time_after(conn_expires_at, now))
1100 goto not_yet_expired;
1101 }
1102
1103 trace_rxrpc_client(conn, -1, rxrpc_client_discard);
1104 if (!test_and_clear_bit(RXRPC_CONN_EXPOSED, &conn->flags))
1105 BUG();
1106 conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
1107 list_del_init(&conn->cache_link);
1108
1109 spin_unlock(&rxnet->client_conn_cache_lock);
1110
1111
1112
1113
1114
1115 rxrpc_put_connection(conn);
1116 did_discard = true;
1117 nr_conns--;
1118 goto next;
1119
1120not_yet_expired:
1121
1122
1123
1124
1125
1126
1127
1128 _debug("not yet");
1129 if (!rxnet->kill_all_client_conns)
1130 timer_reduce(&rxnet->client_conn_reap_timer,
1131 conn_expires_at);
1132
1133out:
1134 spin_unlock(&rxnet->client_conn_cache_lock);
1135 spin_unlock(&rxnet->client_conn_discard_lock);
1136 _leave("");
1137}
1138
1139
1140
1141
1142
1143void rxrpc_destroy_all_client_connections(struct rxrpc_net *rxnet)
1144{
1145 _enter("");
1146
1147 spin_lock(&rxnet->client_conn_cache_lock);
1148 rxnet->kill_all_client_conns = true;
1149 spin_unlock(&rxnet->client_conn_cache_lock);
1150
1151 del_timer_sync(&rxnet->client_conn_reap_timer);
1152
1153 if (!rxrpc_queue_work(&rxnet->client_conn_reaper))
1154 _debug("destroy: queue failed");
1155
1156 _leave("");
1157}
1158