conn_client.c (0d6bf319bc5aba4535bb46e1b607973688a2248a) conn_client.c (9d35d880e0e4a3ab32d8c12f9e4d76198aadd42d)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Client connection-specific management code.
3 *
4 * Copyright (C) 2016, 2020 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 *
7 * Client connections need to be cached for a little while after they've made a
8 * call so as to handle retransmitted DATA packets in case the server didn't

--- 26 unchanged lines hidden (view full) ---

35__read_mostly unsigned long rxrpc_conn_idle_client_fast_expiry = 2 * HZ;
36
37static void rxrpc_activate_bundle(struct rxrpc_bundle *bundle)
38{
39 atomic_inc(&bundle->active);
40}
41
42/*
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Client connection-specific management code.
3 *
4 * Copyright (C) 2016, 2020 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 *
7 * Client connections need to be cached for a little while after they've made a
8 * call so as to handle retransmitted DATA packets in case the server didn't

--- 26 unchanged lines hidden (view full) ---

35__read_mostly unsigned long rxrpc_conn_idle_client_fast_expiry = 2 * HZ;
36
37static void rxrpc_activate_bundle(struct rxrpc_bundle *bundle)
38{
39 atomic_inc(&bundle->active);
40}
41
42/*
43 * Get a connection ID and epoch for a client connection from the global pool.
44 * The connection struct pointer is then recorded in the idr radix tree. The
45 * epoch doesn't change until the client is rebooted (or, at least, unless the
46 * module is unloaded).
47 */
48static int rxrpc_get_client_connection_id(struct rxrpc_connection *conn,
49 gfp_t gfp)
50{
51 struct rxrpc_local *local = conn->local;
52 int id;
53
54 _enter("");
55
56 idr_preload(gfp);
57 spin_lock(&local->conn_lock);
58
59 id = idr_alloc_cyclic(&local->conn_ids, conn,
60 1, 0x40000000, GFP_NOWAIT);
61 if (id < 0)
62 goto error;
63
64 spin_unlock(&local->conn_lock);
65 idr_preload_end();
66
67 conn->proto.epoch = local->rxnet->epoch;
68 conn->proto.cid = id << RXRPC_CIDSHIFT;
69 set_bit(RXRPC_CONN_HAS_IDR, &conn->flags);
70 _leave(" [CID %x]", conn->proto.cid);
71 return 0;
72
73error:
74 spin_unlock(&local->conn_lock);
75 idr_preload_end();
76 _leave(" = %d", id);
77 return id;
78}
79
80/*
81 * Release a connection ID for a client connection.
82 */
83static void rxrpc_put_client_connection_id(struct rxrpc_local *local,
84 struct rxrpc_connection *conn)
85{
43 * Release a connection ID for a client connection.
44 */
45static void rxrpc_put_client_connection_id(struct rxrpc_local *local,
46 struct rxrpc_connection *conn)
47{
86 if (test_bit(RXRPC_CONN_HAS_IDR, &conn->flags)) {
87 spin_lock(&local->conn_lock);
88 idr_remove(&local->conn_ids, conn->proto.cid >> RXRPC_CIDSHIFT);
89 spin_unlock(&local->conn_lock);
90 }
48 idr_remove(&local->conn_ids, conn->proto.cid >> RXRPC_CIDSHIFT);
91}
92
93/*
94 * Destroy the client connection ID tree.
95 */
49}
50
51/*
52 * Destroy the client connection ID tree.
53 */
96void rxrpc_destroy_client_conn_ids(struct rxrpc_local *local)
54static void rxrpc_destroy_client_conn_ids(struct rxrpc_local *local)
97{
98 struct rxrpc_connection *conn;
99 int id;
100
101 if (!idr_is_empty(&local->conn_ids)) {
102 idr_for_each_entry(&local->conn_ids, conn, id) {
103 pr_err("AF_RXRPC: Leaked client conn %p {%d}\n",
104 conn, refcount_read(&conn->ref));

--- 19 unchanged lines hidden (view full) ---

124 bundle->key = key_get(call->key);
125 bundle->security = call->security;
126 bundle->exclusive = test_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
127 bundle->upgrade = test_bit(RXRPC_CALL_UPGRADE, &call->flags);
128 bundle->service_id = call->dest_srx.srx_service;
129 bundle->security_level = call->security_level;
130 refcount_set(&bundle->ref, 1);
131 atomic_set(&bundle->active, 1);
55{
56 struct rxrpc_connection *conn;
57 int id;
58
59 if (!idr_is_empty(&local->conn_ids)) {
60 idr_for_each_entry(&local->conn_ids, conn, id) {
61 pr_err("AF_RXRPC: Leaked client conn %p {%d}\n",
62 conn, refcount_read(&conn->ref));

--- 19 unchanged lines hidden (view full) ---

82 bundle->key = key_get(call->key);
83 bundle->security = call->security;
84 bundle->exclusive = test_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
85 bundle->upgrade = test_bit(RXRPC_CALL_UPGRADE, &call->flags);
86 bundle->service_id = call->dest_srx.srx_service;
87 bundle->security_level = call->security_level;
88 refcount_set(&bundle->ref, 1);
89 atomic_set(&bundle->active, 1);
132 spin_lock_init(&bundle->channel_lock);
133 INIT_LIST_HEAD(&bundle->waiting_calls);
134 trace_rxrpc_bundle(bundle->debug_id, 1, rxrpc_bundle_new);
135 }
136 return bundle;
137}
138
139struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *bundle,
140 enum rxrpc_bundle_trace why)

--- 24 unchanged lines hidden (view full) ---

165 dead = __refcount_dec_and_test(&bundle->ref, &r);
166 trace_rxrpc_bundle(id, r - 1, why);
167 if (dead)
168 rxrpc_free_bundle(bundle);
169 }
170}
171
172/*
90 INIT_LIST_HEAD(&bundle->waiting_calls);
91 trace_rxrpc_bundle(bundle->debug_id, 1, rxrpc_bundle_new);
92 }
93 return bundle;
94}
95
96struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *bundle,
97 enum rxrpc_bundle_trace why)

--- 24 unchanged lines hidden (view full) ---

122 dead = __refcount_dec_and_test(&bundle->ref, &r);
123 trace_rxrpc_bundle(id, r - 1, why);
124 if (dead)
125 rxrpc_free_bundle(bundle);
126 }
127}
128
129/*
130 * Get rid of outstanding client connection preallocations when a local
131 * endpoint is destroyed.
132 */
133void rxrpc_purge_client_connections(struct rxrpc_local *local)
134{
135 rxrpc_destroy_client_conn_ids(local);
136}
137
138/*
173 * Allocate a client connection.
174 */
175static struct rxrpc_connection *
139 * Allocate a client connection.
140 */
141static struct rxrpc_connection *
176rxrpc_alloc_client_connection(struct rxrpc_bundle *bundle, gfp_t gfp)
142rxrpc_alloc_client_connection(struct rxrpc_bundle *bundle)
177{
178 struct rxrpc_connection *conn;
143{
144 struct rxrpc_connection *conn;
179 struct rxrpc_net *rxnet = bundle->local->rxnet;
180 int ret;
145 struct rxrpc_local *local = bundle->local;
146 struct rxrpc_net *rxnet = local->rxnet;
147 int id;
181
182 _enter("");
183
148
149 _enter("");
150
184 conn = rxrpc_alloc_connection(rxnet, gfp);
185 if (!conn) {
186 _leave(" = -ENOMEM");
151 conn = rxrpc_alloc_connection(rxnet, GFP_ATOMIC | __GFP_NOWARN);
152 if (!conn)
187 return ERR_PTR(-ENOMEM);
153 return ERR_PTR(-ENOMEM);
154
155 id = idr_alloc_cyclic(&local->conn_ids, conn, 1, 0x40000000,
156 GFP_ATOMIC | __GFP_NOWARN);
157 if (id < 0) {
158 kfree(conn);
159 return ERR_PTR(id);
188 }
189
190 refcount_set(&conn->ref, 1);
160 }
161
162 refcount_set(&conn->ref, 1);
191 conn->bundle = bundle;
192 conn->local = bundle->local;
193 conn->peer = bundle->peer;
194 conn->key = bundle->key;
163 conn->proto.cid = id << RXRPC_CIDSHIFT;
164 conn->proto.epoch = local->rxnet->epoch;
165 conn->out_clientflag = RXRPC_CLIENT_INITIATED;
166 conn->bundle = rxrpc_get_bundle(bundle, rxrpc_bundle_get_client_conn);
167 conn->local = rxrpc_get_local(bundle->local, rxrpc_local_get_client_conn);
168 conn->peer = rxrpc_get_peer(bundle->peer, rxrpc_peer_get_client_conn);
169 conn->key = key_get(bundle->key);
170 conn->security = bundle->security;
195 conn->exclusive = bundle->exclusive;
196 conn->upgrade = bundle->upgrade;
197 conn->orig_service_id = bundle->service_id;
198 conn->security_level = bundle->security_level;
171 conn->exclusive = bundle->exclusive;
172 conn->upgrade = bundle->upgrade;
173 conn->orig_service_id = bundle->service_id;
174 conn->security_level = bundle->security_level;
199 conn->out_clientflag = RXRPC_CLIENT_INITIATED;
200 conn->state = RXRPC_CONN_CLIENT;
175 conn->state = RXRPC_CONN_CLIENT_UNSECURED;
201 conn->service_id = conn->orig_service_id;
202
176 conn->service_id = conn->orig_service_id;
177
203 ret = rxrpc_get_client_connection_id(conn, gfp);
204 if (ret < 0)
205 goto error_0;
178 if (conn->security == &rxrpc_no_security)
179 conn->state = RXRPC_CONN_CLIENT;
206
180
207 ret = rxrpc_init_client_conn_security(conn);
208 if (ret < 0)
209 goto error_1;
210
211 atomic_inc(&rxnet->nr_conns);
212 write_lock(&rxnet->conn_lock);
213 list_add_tail(&conn->proc_link, &rxnet->conn_proc_list);
214 write_unlock(&rxnet->conn_lock);
215
181 atomic_inc(&rxnet->nr_conns);
182 write_lock(&rxnet->conn_lock);
183 list_add_tail(&conn->proc_link, &rxnet->conn_proc_list);
184 write_unlock(&rxnet->conn_lock);
185
216 rxrpc_get_bundle(bundle, rxrpc_bundle_get_client_conn);
217 rxrpc_get_peer(conn->peer, rxrpc_peer_get_client_conn);
218 rxrpc_get_local(conn->local, rxrpc_local_get_client_conn);
219 key_get(conn->key);
186 rxrpc_see_connection(conn, rxrpc_conn_new_client);
220
187
221 trace_rxrpc_conn(conn->debug_id, refcount_read(&conn->ref),
222 rxrpc_conn_new_client);
223
224 atomic_inc(&rxnet->nr_client_conns);
225 trace_rxrpc_client(conn, -1, rxrpc_client_alloc);
188 atomic_inc(&rxnet->nr_client_conns);
189 trace_rxrpc_client(conn, -1, rxrpc_client_alloc);
226 _leave(" = %p", conn);
227 return conn;
190 return conn;
228
229error_1:
230 rxrpc_put_client_connection_id(bundle->local, conn);
231error_0:
232 kfree(conn);
233 _leave(" = %d", ret);
234 return ERR_PTR(ret);
235}
236
237/*
238 * Determine if a connection may be reused.
239 */
240static bool rxrpc_may_reuse_conn(struct rxrpc_connection *conn)
241{
242 struct rxrpc_net *rxnet;
243 int id_cursor, id, distance, limit;
244
245 if (!conn)
246 goto dont_reuse;
247
248 rxnet = conn->rxnet;
249 if (test_bit(RXRPC_CONN_DONT_REUSE, &conn->flags))
250 goto dont_reuse;
251
191}
192
193/*
194 * Determine if a connection may be reused.
195 */
196static bool rxrpc_may_reuse_conn(struct rxrpc_connection *conn)
197{
198 struct rxrpc_net *rxnet;
199 int id_cursor, id, distance, limit;
200
201 if (!conn)
202 goto dont_reuse;
203
204 rxnet = conn->rxnet;
205 if (test_bit(RXRPC_CONN_DONT_REUSE, &conn->flags))
206 goto dont_reuse;
207
252 if (conn->state != RXRPC_CONN_CLIENT ||
208 if ((conn->state != RXRPC_CONN_CLIENT_UNSECURED &&
209 conn->state != RXRPC_CONN_CLIENT) ||
253 conn->proto.epoch != rxnet->epoch)
254 goto mark_dont_reuse;
255
256 /* The IDR tree gets very expensive on memory if the connection IDs are
257 * widely scattered throughout the number space, so we shall want to
258 * kill off connections that, say, have an ID more than about four
259 * times the maximum number of client conns away from the current
260 * allocation point to try and keep the IDs concentrated.

--- 14 unchanged lines hidden (view full) ---

275dont_reuse:
276 return false;
277}
278
279/*
280 * Look up the conn bundle that matches the connection parameters, adding it if
281 * it doesn't yet exist.
282 */
210 conn->proto.epoch != rxnet->epoch)
211 goto mark_dont_reuse;
212
213 /* The IDR tree gets very expensive on memory if the connection IDs are
214 * widely scattered throughout the number space, so we shall want to
215 * kill off connections that, say, have an ID more than about four
216 * times the maximum number of client conns away from the current
217 * allocation point to try and keep the IDs concentrated.

--- 14 unchanged lines hidden (view full) ---

232dont_reuse:
233 return false;
234}
235
236/*
237 * Look up the conn bundle that matches the connection parameters, adding it if
238 * it doesn't yet exist.
239 */
283static struct rxrpc_bundle *rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp)
240int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp)
284{
285 static atomic_t rxrpc_bundle_id;
286 struct rxrpc_bundle *bundle, *candidate;
287 struct rxrpc_local *local = call->local;
288 struct rb_node *p, **pp, *parent;
289 long diff;
290 bool upgrade = test_bit(RXRPC_CALL_UPGRADE, &call->flags);
291
292 _enter("{%px,%x,%u,%u}",
293 call->peer, key_serial(call->key), call->security_level,
294 upgrade);
295
296 if (test_bit(RXRPC_CALL_EXCLUSIVE, &call->flags)) {
297 call->bundle = rxrpc_alloc_bundle(call, gfp);
241{
242 static atomic_t rxrpc_bundle_id;
243 struct rxrpc_bundle *bundle, *candidate;
244 struct rxrpc_local *local = call->local;
245 struct rb_node *p, **pp, *parent;
246 long diff;
247 bool upgrade = test_bit(RXRPC_CALL_UPGRADE, &call->flags);
248
249 _enter("{%px,%x,%u,%u}",
250 call->peer, key_serial(call->key), call->security_level,
251 upgrade);
252
253 if (test_bit(RXRPC_CALL_EXCLUSIVE, &call->flags)) {
254 call->bundle = rxrpc_alloc_bundle(call, gfp);
298 return call->bundle;
255 return call->bundle ? 0 : -ENOMEM;
299 }
300
301 /* First, see if the bundle is already there. */
302 _debug("search 1");
303 spin_lock(&local->client_bundles_lock);
304 p = local->client_bundles.rb_node;
305 while (p) {
306 bundle = rb_entry(p, struct rxrpc_bundle, local_node);

--- 12 unchanged lines hidden (view full) ---

319 goto found_bundle;
320 }
321 spin_unlock(&local->client_bundles_lock);
322 _debug("not found");
323
324 /* It wasn't. We need to add one. */
325 candidate = rxrpc_alloc_bundle(call, gfp);
326 if (!candidate)
256 }
257
258 /* First, see if the bundle is already there. */
259 _debug("search 1");
260 spin_lock(&local->client_bundles_lock);
261 p = local->client_bundles.rb_node;
262 while (p) {
263 bundle = rb_entry(p, struct rxrpc_bundle, local_node);

--- 12 unchanged lines hidden (view full) ---

276 goto found_bundle;
277 }
278 spin_unlock(&local->client_bundles_lock);
279 _debug("not found");
280
281 /* It wasn't. We need to add one. */
282 candidate = rxrpc_alloc_bundle(call, gfp);
283 if (!candidate)
327 return ERR_PTR(-ENOMEM);
284 return -ENOMEM;
328
329 _debug("search 2");
330 spin_lock(&local->client_bundles_lock);
331 pp = &local->client_bundles.rb_node;
332 parent = NULL;
333 while (*pp) {
334 parent = *pp;
335 bundle = rb_entry(parent, struct rxrpc_bundle, local_node);

--- 14 unchanged lines hidden (view full) ---

350
351 _debug("new bundle");
352 candidate->debug_id = atomic_inc_return(&rxrpc_bundle_id);
353 rb_link_node(&candidate->local_node, parent, pp);
354 rb_insert_color(&candidate->local_node, &local->client_bundles);
355 call->bundle = rxrpc_get_bundle(candidate, rxrpc_bundle_get_client_call);
356 spin_unlock(&local->client_bundles_lock);
357 _leave(" = B=%u [new]", call->bundle->debug_id);
285
286 _debug("search 2");
287 spin_lock(&local->client_bundles_lock);
288 pp = &local->client_bundles.rb_node;
289 parent = NULL;
290 while (*pp) {
291 parent = *pp;
292 bundle = rb_entry(parent, struct rxrpc_bundle, local_node);

--- 14 unchanged lines hidden (view full) ---

307
308 _debug("new bundle");
309 candidate->debug_id = atomic_inc_return(&rxrpc_bundle_id);
310 rb_link_node(&candidate->local_node, parent, pp);
311 rb_insert_color(&candidate->local_node, &local->client_bundles);
312 call->bundle = rxrpc_get_bundle(candidate, rxrpc_bundle_get_client_call);
313 spin_unlock(&local->client_bundles_lock);
314 _leave(" = B=%u [new]", call->bundle->debug_id);
358 return call->bundle;
315 return 0;
359
360found_bundle_free:
361 rxrpc_free_bundle(candidate);
362found_bundle:
363 call->bundle = rxrpc_get_bundle(bundle, rxrpc_bundle_get_client_call);
364 rxrpc_activate_bundle(bundle);
365 spin_unlock(&local->client_bundles_lock);
366 _leave(" = B=%u [found]", call->bundle->debug_id);
316
317found_bundle_free:
318 rxrpc_free_bundle(candidate);
319found_bundle:
320 call->bundle = rxrpc_get_bundle(bundle, rxrpc_bundle_get_client_call);
321 rxrpc_activate_bundle(bundle);
322 spin_unlock(&local->client_bundles_lock);
323 _leave(" = B=%u [found]", call->bundle->debug_id);
367 return call->bundle;
324 return 0;
368}
369
370/*
325}
326
327/*
371 * Create or find a client bundle to use for a call.
372 *
373 * If we return with a connection, the call will be on its waiting list. It's
374 * left to the caller to assign a channel and wake up the call.
375 */
376static struct rxrpc_bundle *rxrpc_prep_call(struct rxrpc_call *call, gfp_t gfp)
377{
378 struct rxrpc_bundle *bundle;
379
380 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
381
382 call->peer = rxrpc_lookup_peer(call->local, &call->dest_srx, gfp);
383 if (!call->peer)
384 goto error;
385
386 call->tx_last_sent = ktime_get_real();
387 call->cong_ssthresh = call->peer->cong_ssthresh;
388 if (call->cong_cwnd >= call->cong_ssthresh)
389 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
390 else
391 call->cong_mode = RXRPC_CALL_SLOW_START;
392
393 /* Find the client connection bundle. */
394 bundle = rxrpc_look_up_bundle(call, gfp);
395 if (!bundle)
396 goto error;
397
398 /* Get this call queued. Someone else may activate it whilst we're
399 * lining up a new connection, but that's fine.
400 */
401 spin_lock(&bundle->channel_lock);
402 list_add_tail(&call->chan_wait_link, &bundle->waiting_calls);
403 spin_unlock(&bundle->channel_lock);
404
405 _leave(" = [B=%x]", bundle->debug_id);
406 return bundle;
407
408error:
409 _leave(" = -ENOMEM");
410 return ERR_PTR(-ENOMEM);
411}
412
413/*
414 * Allocate a new connection and add it into a bundle.
415 */
328 * Allocate a new connection and add it into a bundle.
329 */
416static void rxrpc_add_conn_to_bundle(struct rxrpc_bundle *bundle, gfp_t gfp)
417 __releases(bundle->channel_lock)
330static bool rxrpc_add_conn_to_bundle(struct rxrpc_bundle *bundle,
331 unsigned int slot)
418{
332{
419 struct rxrpc_connection *candidate = NULL, *old = NULL;
420 bool conflict;
421 int i;
333 struct rxrpc_connection *conn, *old;
334 unsigned int shift = slot * RXRPC_MAXCALLS;
335 unsigned int i;
422
336
423 _enter("");
424
425 conflict = bundle->alloc_conn;
426 if (!conflict)
427 bundle->alloc_conn = true;
428 spin_unlock(&bundle->channel_lock);
429 if (conflict) {
430 _leave(" [conf]");
431 return;
337 old = bundle->conns[slot];
338 if (old) {
339 bundle->conns[slot] = NULL;
340 trace_rxrpc_client(old, -1, rxrpc_client_replace);
341 rxrpc_put_connection(old, rxrpc_conn_put_noreuse);
432 }
433
342 }
343
434 candidate = rxrpc_alloc_client_connection(bundle, gfp);
435
436 spin_lock(&bundle->channel_lock);
437 bundle->alloc_conn = false;
438
439 if (IS_ERR(candidate)) {
440 bundle->alloc_error = PTR_ERR(candidate);
441 spin_unlock(&bundle->channel_lock);
442 _leave(" [err %ld]", PTR_ERR(candidate));
443 return;
344 conn = rxrpc_alloc_client_connection(bundle);
345 if (IS_ERR(conn)) {
346 bundle->alloc_error = PTR_ERR(conn);
347 return false;
444 }
445
348 }
349
446 bundle->alloc_error = 0;
447
448 for (i = 0; i < ARRAY_SIZE(bundle->conns); i++) {
449 unsigned int shift = i * RXRPC_MAXCALLS;
450 int j;
451
452 old = bundle->conns[i];
453 if (!rxrpc_may_reuse_conn(old)) {
454 if (old)
455 trace_rxrpc_client(old, -1, rxrpc_client_replace);
456 candidate->bundle_shift = shift;
457 rxrpc_activate_bundle(bundle);
458 bundle->conns[i] = candidate;
459 for (j = 0; j < RXRPC_MAXCALLS; j++)
460 set_bit(shift + j, &bundle->avail_chans);
461 candidate = NULL;
462 break;
463 }
464
465 old = NULL;
466 }
467
468 spin_unlock(&bundle->channel_lock);
469
470 if (candidate) {
471 _debug("discard C=%x", candidate->debug_id);
472 trace_rxrpc_client(candidate, -1, rxrpc_client_duplicate);
473 rxrpc_put_connection(candidate, rxrpc_conn_put_discard);
474 }
475
476 rxrpc_put_connection(old, rxrpc_conn_put_noreuse);
477 _leave("");
350 rxrpc_activate_bundle(bundle);
351 conn->bundle_shift = shift;
352 bundle->conns[slot] = conn;
353 for (i = 0; i < RXRPC_MAXCALLS; i++)
354 set_bit(shift + i, &bundle->avail_chans);
355 return true;
478}
479
480/*
481 * Add a connection to a bundle if there are no usable connections or we have
482 * connections waiting for extra capacity.
483 */
356}
357
358/*
359 * Add a connection to a bundle if there are no usable connections or we have
360 * connections waiting for extra capacity.
361 */
484static void rxrpc_maybe_add_conn(struct rxrpc_bundle *bundle, gfp_t gfp)
362static bool rxrpc_bundle_has_space(struct rxrpc_bundle *bundle)
485{
363{
486 struct rxrpc_call *call;
487 int i, usable;
364 int slot = -1, i, usable;
488
489 _enter("");
490
365
366 _enter("");
367
491 spin_lock(&bundle->channel_lock);
368 bundle->alloc_error = 0;
492
493 /* See if there are any usable connections. */
494 usable = 0;
369
370 /* See if there are any usable connections. */
371 usable = 0;
495 for (i = 0; i < ARRAY_SIZE(bundle->conns); i++)
372 for (i = 0; i < ARRAY_SIZE(bundle->conns); i++) {
496 if (rxrpc_may_reuse_conn(bundle->conns[i]))
497 usable++;
373 if (rxrpc_may_reuse_conn(bundle->conns[i]))
374 usable++;
498
499 if (!usable && !list_empty(&bundle->waiting_calls)) {
500 call = list_first_entry(&bundle->waiting_calls,
501 struct rxrpc_call, chan_wait_link);
502 if (test_bit(RXRPC_CALL_UPGRADE, &call->flags))
503 bundle->try_upgrade = true;
375 else if (slot == -1)
376 slot = i;
504 }
505
377 }
378
379 if (!usable && bundle->upgrade)
380 bundle->try_upgrade = true;
381
506 if (!usable)
507 goto alloc_conn;
508
509 if (!bundle->avail_chans &&
510 !bundle->try_upgrade &&
382 if (!usable)
383 goto alloc_conn;
384
385 if (!bundle->avail_chans &&
386 !bundle->try_upgrade &&
511 !list_empty(&bundle->waiting_calls) &&
512 usable < ARRAY_SIZE(bundle->conns))
513 goto alloc_conn;
514
387 usable < ARRAY_SIZE(bundle->conns))
388 goto alloc_conn;
389
515 spin_unlock(&bundle->channel_lock);
516 _leave("");
390 _leave("");
517 return;
391 return usable;
518
519alloc_conn:
392
393alloc_conn:
520 return rxrpc_add_conn_to_bundle(bundle, gfp);
394 return slot >= 0 ? rxrpc_add_conn_to_bundle(bundle, slot) : false;
521}
522
523/*
524 * Assign a channel to the call at the front of the queue and wake the call up.
525 * We don't increment the callNumber counter until this number has been exposed
526 * to the world.
527 */
528static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,
529 unsigned int channel)
530{
531 struct rxrpc_channel *chan = &conn->channels[channel];
532 struct rxrpc_bundle *bundle = conn->bundle;
533 struct rxrpc_call *call = list_entry(bundle->waiting_calls.next,
395}
396
397/*
398 * Assign a channel to the call at the front of the queue and wake the call up.
399 * We don't increment the callNumber counter until this number has been exposed
400 * to the world.
401 */
402static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,
403 unsigned int channel)
404{
405 struct rxrpc_channel *chan = &conn->channels[channel];
406 struct rxrpc_bundle *bundle = conn->bundle;
407 struct rxrpc_call *call = list_entry(bundle->waiting_calls.next,
534 struct rxrpc_call, chan_wait_link);
408 struct rxrpc_call, wait_link);
535 u32 call_id = chan->call_counter + 1;
536
537 _enter("C=%x,%u", conn->debug_id, channel);
538
409 u32 call_id = chan->call_counter + 1;
410
411 _enter("C=%x,%u", conn->debug_id, channel);
412
413 list_del_init(&call->wait_link);
414
539 trace_rxrpc_client(conn, channel, rxrpc_client_chan_activate);
540
541 /* Cancel the final ACK on the previous call if it hasn't been sent yet
542 * as the DATA packet will implicitly ACK it.
543 */
544 clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
545 clear_bit(conn->bundle_shift + channel, &bundle->avail_chans);
546
547 rxrpc_see_call(call, rxrpc_call_see_activate_client);
415 trace_rxrpc_client(conn, channel, rxrpc_client_chan_activate);
416
417 /* Cancel the final ACK on the previous call if it hasn't been sent yet
418 * as the DATA packet will implicitly ACK it.
419 */
420 clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
421 clear_bit(conn->bundle_shift + channel, &bundle->avail_chans);
422
423 rxrpc_see_call(call, rxrpc_call_see_activate_client);
548 list_del_init(&call->chan_wait_link);
549 call->conn = rxrpc_get_connection(conn, rxrpc_conn_get_activate_call);
550 call->cid = conn->proto.cid | channel;
551 call->call_id = call_id;
552 call->dest_srx.srx_service = conn->service_id;
424 call->conn = rxrpc_get_connection(conn, rxrpc_conn_get_activate_call);
425 call->cid = conn->proto.cid | channel;
426 call->call_id = call_id;
427 call->dest_srx.srx_service = conn->service_id;
428 call->cong_ssthresh = call->peer->cong_ssthresh;
429 if (call->cong_cwnd >= call->cong_ssthresh)
430 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
431 else
432 call->cong_mode = RXRPC_CALL_SLOW_START;
553
433
554 trace_rxrpc_connect_call(call);
555
556 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_SEND_REQUEST);
557
558 /* Paired with the read barrier in rxrpc_connect_call(). This orders
559 * cid and epoch in the connection wrt to call_id without the need to
560 * take the channel_lock.
561 *
562 * We provisionally assign a callNumber at this point, but we don't
563 * confirm it until the call is about to be exposed.
564 *
565 * TODO: Pair with a barrier in the data_ready handler when that looks
566 * at the call ID through a connection channel.
567 */
568 smp_wmb();
569
570 chan->call_id = call_id;
571 chan->call_debug_id = call->debug_id;
434 chan->call_id = call_id;
435 chan->call_debug_id = call->debug_id;
572 rcu_assign_pointer(chan->call, call);
436 chan->call = call;
437
438 rxrpc_see_call(call, rxrpc_call_see_connected);
439 trace_rxrpc_connect_call(call);
440 call->tx_last_sent = ktime_get_real();
441 rxrpc_start_call_timer(call);
442 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_SEND_REQUEST);
573 wake_up(&call->waitq);
574}
575
576/*
577 * Remove a connection from the idle list if it's on it.
578 */
443 wake_up(&call->waitq);
444}
445
446/*
447 * Remove a connection from the idle list if it's on it.
448 */
579static void rxrpc_unidle_conn(struct rxrpc_bundle *bundle, struct rxrpc_connection *conn)
449static void rxrpc_unidle_conn(struct rxrpc_connection *conn)
580{
450{
581 struct rxrpc_local *local = bundle->local;
582 bool drop_ref;
583
584 if (!list_empty(&conn->cache_link)) {
451 if (!list_empty(&conn->cache_link)) {
585 drop_ref = false;
586 spin_lock(&local->client_conn_cache_lock);
587 if (!list_empty(&conn->cache_link)) {
588 list_del_init(&conn->cache_link);
589 drop_ref = true;
590 }
591 spin_unlock(&local->client_conn_cache_lock);
592 if (drop_ref)
593 rxrpc_put_connection(conn, rxrpc_conn_put_unidle);
452 list_del_init(&conn->cache_link);
453 rxrpc_put_connection(conn, rxrpc_conn_put_unidle);
594 }
595}
596
597/*
454 }
455}
456
457/*
598 * Assign channels and callNumbers to waiting calls with channel_lock
599 * held by caller.
458 * Assign channels and callNumbers to waiting calls.
600 */
459 */
601static void rxrpc_activate_channels_locked(struct rxrpc_bundle *bundle)
460static void rxrpc_activate_channels(struct rxrpc_bundle *bundle)
602{
603 struct rxrpc_connection *conn;
604 unsigned long avail, mask;
605 unsigned int channel, slot;
606
461{
462 struct rxrpc_connection *conn;
463 unsigned long avail, mask;
464 unsigned int channel, slot;
465
466 trace_rxrpc_client(NULL, -1, rxrpc_client_activate_chans);
467
607 if (bundle->try_upgrade)
608 mask = 1;
609 else
610 mask = ULONG_MAX;
611
612 while (!list_empty(&bundle->waiting_calls)) {
613 avail = bundle->avail_chans & mask;
614 if (!avail)
615 break;
616 channel = __ffs(avail);
617 clear_bit(channel, &bundle->avail_chans);
618
619 slot = channel / RXRPC_MAXCALLS;
620 conn = bundle->conns[slot];
621 if (!conn)
622 break;
623
624 if (bundle->try_upgrade)
625 set_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags);
468 if (bundle->try_upgrade)
469 mask = 1;
470 else
471 mask = ULONG_MAX;
472
473 while (!list_empty(&bundle->waiting_calls)) {
474 avail = bundle->avail_chans & mask;
475 if (!avail)
476 break;
477 channel = __ffs(avail);
478 clear_bit(channel, &bundle->avail_chans);
479
480 slot = channel / RXRPC_MAXCALLS;
481 conn = bundle->conns[slot];
482 if (!conn)
483 break;
484
485 if (bundle->try_upgrade)
486 set_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags);
626 rxrpc_unidle_conn(bundle, conn);
487 rxrpc_unidle_conn(conn);
627
628 channel &= (RXRPC_MAXCALLS - 1);
629 conn->act_chans |= 1 << channel;
630 rxrpc_activate_one_channel(conn, channel);
631 }
632}
633
634/*
488
489 channel &= (RXRPC_MAXCALLS - 1);
490 conn->act_chans |= 1 << channel;
491 rxrpc_activate_one_channel(conn, channel);
492 }
493}
494
495/*
635 * Assign channels and callNumbers to waiting calls.
496 * Connect waiting channels (called from the I/O thread).
636 */
497 */
637static void rxrpc_activate_channels(struct rxrpc_bundle *bundle)
498void rxrpc_connect_client_calls(struct rxrpc_local *local)
638{
499{
639 _enter("B=%x", bundle->debug_id);
500 struct rxrpc_call *call;
640
501
641 trace_rxrpc_client(NULL, -1, rxrpc_client_activate_chans);
502 while ((call = list_first_entry_or_null(&local->new_client_calls,
503 struct rxrpc_call, wait_link))
504 ) {
505 struct rxrpc_bundle *bundle = call->bundle;
642
506
643 if (!bundle->avail_chans)
644 return;
507 spin_lock(&local->client_call_lock);
508 list_move_tail(&call->wait_link, &bundle->waiting_calls);
509 spin_unlock(&local->client_call_lock);
645
510
646 spin_lock(&bundle->channel_lock);
647 rxrpc_activate_channels_locked(bundle);
648 spin_unlock(&bundle->channel_lock);
649 _leave("");
650}
651
652/*
653 * Wait for a callNumber and a channel to be granted to a call.
654 */
655static int rxrpc_wait_for_channel(struct rxrpc_bundle *bundle,
656 struct rxrpc_call *call, gfp_t gfp)
657{
658 DECLARE_WAITQUEUE(myself, current);
659 int ret = 0;
660
661 _enter("%d", call->debug_id);
662
663 if (!gfpflags_allow_blocking(gfp)) {
664 rxrpc_maybe_add_conn(bundle, gfp);
665 rxrpc_activate_channels(bundle);
666 ret = bundle->alloc_error ?: -EAGAIN;
667 goto out;
511 if (rxrpc_bundle_has_space(bundle))
512 rxrpc_activate_channels(bundle);
668 }
513 }
669
670 add_wait_queue_exclusive(&call->waitq, &myself);
671 for (;;) {
672 rxrpc_maybe_add_conn(bundle, gfp);
673 rxrpc_activate_channels(bundle);
674 ret = bundle->alloc_error;
675 if (ret < 0)
676 break;
677
678 switch (call->interruptibility) {
679 case RXRPC_INTERRUPTIBLE:
680 case RXRPC_PREINTERRUPTIBLE:
681 set_current_state(TASK_INTERRUPTIBLE);
682 break;
683 case RXRPC_UNINTERRUPTIBLE:
684 default:
685 set_current_state(TASK_UNINTERRUPTIBLE);
686 break;
687 }
688 if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN)
689 break;
690 if ((call->interruptibility == RXRPC_INTERRUPTIBLE ||
691 call->interruptibility == RXRPC_PREINTERRUPTIBLE) &&
692 signal_pending(current)) {
693 ret = -ERESTARTSYS;
694 break;
695 }
696 schedule();
697 }
698 remove_wait_queue(&call->waitq, &myself);
699 __set_current_state(TASK_RUNNING);
700
701out:
702 _leave(" = %d", ret);
703 return ret;
704}
705
706/*
514}
515
516/*
707 * find a connection for a call
708 * - called in process context with IRQs enabled
709 */
710int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
711{
712 struct rxrpc_bundle *bundle;
713 int ret = 0;
714
715 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
716
717 rxrpc_get_call(call, rxrpc_call_get_io_thread);
718
719 bundle = rxrpc_prep_call(call, gfp);
720 if (IS_ERR(bundle)) {
721 rxrpc_put_call(call, rxrpc_call_get_io_thread);
722 ret = PTR_ERR(bundle);
723 goto out;
724 }
725
726 if (rxrpc_call_state(call) == RXRPC_CALL_CLIENT_AWAIT_CONN) {
727 ret = rxrpc_wait_for_channel(bundle, call, gfp);
728 if (ret < 0)
729 goto wait_failed;
730 }
731
732granted_channel:
733 /* Paired with the write barrier in rxrpc_activate_one_channel(). */
734 smp_rmb();
735
736out:
737 _leave(" = %d", ret);
738 return ret;
739
740wait_failed:
741 spin_lock(&bundle->channel_lock);
742 list_del_init(&call->chan_wait_link);
743 spin_unlock(&bundle->channel_lock);
744
745 if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN) {
746 ret = 0;
747 goto granted_channel;
748 }
749
750 trace_rxrpc_client(call->conn, ret, rxrpc_client_chan_wait_failed);
751 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
752 rxrpc_disconnect_client_call(bundle, call);
753 goto out;
754}
755
756/*
757 * Note that a call, and thus a connection, is about to be exposed to the
758 * world.
759 */
760void rxrpc_expose_client_call(struct rxrpc_call *call)
761{
762 unsigned int channel = call->cid & RXRPC_CHANNELMASK;
763 struct rxrpc_connection *conn = call->conn;
764 struct rxrpc_channel *chan = &conn->channels[channel];

--- 38 unchanged lines hidden (view full) ---

803 struct rxrpc_channel *chan = NULL;
804 struct rxrpc_local *local = bundle->local;
805 unsigned int channel;
806 bool may_reuse;
807 u32 cid;
808
809 _enter("c=%x", call->debug_id);
810
517 * Note that a call, and thus a connection, is about to be exposed to the
518 * world.
519 */
520void rxrpc_expose_client_call(struct rxrpc_call *call)
521{
522 unsigned int channel = call->cid & RXRPC_CHANNELMASK;
523 struct rxrpc_connection *conn = call->conn;
524 struct rxrpc_channel *chan = &conn->channels[channel];

--- 38 unchanged lines hidden (view full) ---

563 struct rxrpc_channel *chan = NULL;
564 struct rxrpc_local *local = bundle->local;
565 unsigned int channel;
566 bool may_reuse;
567 u32 cid;
568
569 _enter("c=%x", call->debug_id);
570
811 spin_lock(&bundle->channel_lock);
812
813 /* Calls that have never actually been assigned a channel can simply be
814 * discarded.
815 */
816 conn = call->conn;
817 if (!conn) {
818 _debug("call is waiting");
819 ASSERTCMP(call->call_id, ==, 0);
820 ASSERT(!test_bit(RXRPC_CALL_EXPOSED, &call->flags));
571 /* Calls that have never actually been assigned a channel can simply be
572 * discarded.
573 */
574 conn = call->conn;
575 if (!conn) {
576 _debug("call is waiting");
577 ASSERTCMP(call->call_id, ==, 0);
578 ASSERT(!test_bit(RXRPC_CALL_EXPOSED, &call->flags));
821 list_del_init(&call->chan_wait_link);
822 goto out;
579 list_del_init(&call->wait_link);
580 return;
823 }
824
825 cid = call->cid;
826 channel = cid & RXRPC_CHANNELMASK;
827 chan = &conn->channels[channel];
828 trace_rxrpc_client(conn, channel, rxrpc_client_chan_disconnect);
829
581 }
582
583 cid = call->cid;
584 channel = cid & RXRPC_CHANNELMASK;
585 chan = &conn->channels[channel];
586 trace_rxrpc_client(conn, channel, rxrpc_client_chan_disconnect);
587
830 if (rcu_access_pointer(chan->call) != call) {
831 spin_unlock(&bundle->channel_lock);
832 BUG();
833 }
588 if (WARN_ON(chan->call != call))
589 return;
834
835 may_reuse = rxrpc_may_reuse_conn(conn);
836
837 /* If a client call was exposed to the world, we save the result for
838 * retransmission.
839 *
840 * We use a barrier here so that the call number and abort code can be
841 * read without needing to take a lock.

--- 4 unchanged lines hidden (view full) ---

846 if (test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
847 _debug("exposed %u,%u", call->call_id, call->abort_code);
848 __rxrpc_disconnect_call(conn, call);
849
850 if (test_and_clear_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) {
851 trace_rxrpc_client(conn, channel, rxrpc_client_to_active);
852 bundle->try_upgrade = false;
853 if (may_reuse)
590
591 may_reuse = rxrpc_may_reuse_conn(conn);
592
593 /* If a client call was exposed to the world, we save the result for
594 * retransmission.
595 *
596 * We use a barrier here so that the call number and abort code can be
597 * read without needing to take a lock.

--- 4 unchanged lines hidden (view full) ---

602 if (test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
603 _debug("exposed %u,%u", call->call_id, call->abort_code);
604 __rxrpc_disconnect_call(conn, call);
605
606 if (test_and_clear_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) {
607 trace_rxrpc_client(conn, channel, rxrpc_client_to_active);
608 bundle->try_upgrade = false;
609 if (may_reuse)
854 rxrpc_activate_channels_locked(bundle);
610 rxrpc_activate_channels(bundle);
855 }
611 }
856
857 }
858
859 /* See if we can pass the channel directly to another call. */
860 if (may_reuse && !list_empty(&bundle->waiting_calls)) {
861 trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
862 rxrpc_activate_one_channel(conn, channel);
612 }
613
614 /* See if we can pass the channel directly to another call. */
615 if (may_reuse && !list_empty(&bundle->waiting_calls)) {
616 trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
617 rxrpc_activate_one_channel(conn, channel);
863 goto out;
618 return;
864 }
865
866 /* Schedule the final ACK to be transmitted in a short while so that it
867 * can be skipped if we find a follow-on call. The first DATA packet
868 * of the follow on call will implicitly ACK this call.
869 */
870 if (call->completion == RXRPC_CALL_SUCCEEDED &&
871 test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
872 unsigned long final_ack_at = jiffies + 2;
873
874 WRITE_ONCE(chan->final_ack_at, final_ack_at);
875 smp_wmb(); /* vs rxrpc_process_delayed_final_acks() */
876 set_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
877 rxrpc_reduce_conn_timer(conn, final_ack_at);
878 }
879
880 /* Deactivate the channel. */
619 }
620
621 /* Schedule the final ACK to be transmitted in a short while so that it
622 * can be skipped if we find a follow-on call. The first DATA packet
623 * of the follow on call will implicitly ACK this call.
624 */
625 if (call->completion == RXRPC_CALL_SUCCEEDED &&
626 test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
627 unsigned long final_ack_at = jiffies + 2;
628
629 WRITE_ONCE(chan->final_ack_at, final_ack_at);
630 smp_wmb(); /* vs rxrpc_process_delayed_final_acks() */
631 set_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
632 rxrpc_reduce_conn_timer(conn, final_ack_at);
633 }
634
635 /* Deactivate the channel. */
881 rcu_assign_pointer(chan->call, NULL);
636 chan->call = NULL;
882 set_bit(conn->bundle_shift + channel, &conn->bundle->avail_chans);
883 conn->act_chans &= ~(1 << channel);
884
885 /* If no channels remain active, then put the connection on the idle
886 * list for a short while. Give it a ref to stop it going away if it
887 * becomes unbundled.
888 */
889 if (!conn->act_chans) {
890 trace_rxrpc_client(conn, channel, rxrpc_client_to_idle);
891 conn->idle_timestamp = jiffies;
892
893 rxrpc_get_connection(conn, rxrpc_conn_get_idle);
637 set_bit(conn->bundle_shift + channel, &conn->bundle->avail_chans);
638 conn->act_chans &= ~(1 << channel);
639
640 /* If no channels remain active, then put the connection on the idle
641 * list for a short while. Give it a ref to stop it going away if it
642 * becomes unbundled.
643 */
644 if (!conn->act_chans) {
645 trace_rxrpc_client(conn, channel, rxrpc_client_to_idle);
646 conn->idle_timestamp = jiffies;
647
648 rxrpc_get_connection(conn, rxrpc_conn_get_idle);
894 spin_lock(&local->client_conn_cache_lock);
895 list_move_tail(&conn->cache_link, &local->idle_client_conns);
649 list_move_tail(&conn->cache_link, &local->idle_client_conns);
896 spin_unlock(&local->client_conn_cache_lock);
897
898 rxrpc_set_client_reap_timer(local);
899 }
650
651 rxrpc_set_client_reap_timer(local);
652 }
900
901out:
902 spin_unlock(&bundle->channel_lock);
903}
904
905/*
906 * Remove a connection from a bundle.
907 */
908static void rxrpc_unbundle_conn(struct rxrpc_connection *conn)
909{
910 struct rxrpc_bundle *bundle = conn->bundle;
911 unsigned int bindex;
653}
654
655/*
656 * Remove a connection from a bundle.
657 */
658static void rxrpc_unbundle_conn(struct rxrpc_connection *conn)
659{
660 struct rxrpc_bundle *bundle = conn->bundle;
661 unsigned int bindex;
912 bool need_drop = false;
913 int i;
914
915 _enter("C=%x", conn->debug_id);
916
917 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
918 rxrpc_process_delayed_final_acks(conn, true);
919
662 int i;
663
664 _enter("C=%x", conn->debug_id);
665
666 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
667 rxrpc_process_delayed_final_acks(conn, true);
668
920 spin_lock(&bundle->channel_lock);
921 bindex = conn->bundle_shift / RXRPC_MAXCALLS;
922 if (bundle->conns[bindex] == conn) {
923 _debug("clear slot %u", bindex);
924 bundle->conns[bindex] = NULL;
925 for (i = 0; i < RXRPC_MAXCALLS; i++)
926 clear_bit(conn->bundle_shift + i, &bundle->avail_chans);
669 bindex = conn->bundle_shift / RXRPC_MAXCALLS;
670 if (bundle->conns[bindex] == conn) {
671 _debug("clear slot %u", bindex);
672 bundle->conns[bindex] = NULL;
673 for (i = 0; i < RXRPC_MAXCALLS; i++)
674 clear_bit(conn->bundle_shift + i, &bundle->avail_chans);
927 need_drop = true;
928 }
929 spin_unlock(&bundle->channel_lock);
930
931 if (need_drop) {
675 rxrpc_put_client_connection_id(bundle->local, conn);
932 rxrpc_deactivate_bundle(bundle);
933 rxrpc_put_connection(conn, rxrpc_conn_put_unbundle);
934 }
935}
936
937/*
938 * Drop the active count on a bundle.
939 */

--- 45 unchanged lines hidden (view full) ---

985void rxrpc_discard_expired_client_conns(struct rxrpc_local *local)
986{
987 struct rxrpc_connection *conn;
988 unsigned long expiry, conn_expires_at, now;
989 unsigned int nr_conns;
990
991 _enter("");
992
676 rxrpc_deactivate_bundle(bundle);
677 rxrpc_put_connection(conn, rxrpc_conn_put_unbundle);
678 }
679}
680
681/*
682 * Drop the active count on a bundle.
683 */

--- 45 unchanged lines hidden (view full) ---

729void rxrpc_discard_expired_client_conns(struct rxrpc_local *local)
730{
731 struct rxrpc_connection *conn;
732 unsigned long expiry, conn_expires_at, now;
733 unsigned int nr_conns;
734
735 _enter("");
736
993 if (list_empty(&local->idle_client_conns)) {
994 _leave(" [empty]");
995 return;
996 }
997
998 /* We keep an estimate of what the number of conns ought to be after
999 * we've discarded some so that we don't overdo the discarding.
1000 */
1001 nr_conns = atomic_read(&local->rxnet->nr_client_conns);
1002
1003next:
737 /* We keep an estimate of what the number of conns ought to be after
738 * we've discarded some so that we don't overdo the discarding.
739 */
740 nr_conns = atomic_read(&local->rxnet->nr_client_conns);
741
742next:
1004 spin_lock(&local->client_conn_cache_lock);
743 conn = list_first_entry_or_null(&local->idle_client_conns,
744 struct rxrpc_connection, cache_link);
745 if (!conn)
746 return;
1005
747
1006 if (list_empty(&local->idle_client_conns))
1007 goto out;
1008
1009 conn = list_entry(local->idle_client_conns.next,
1010 struct rxrpc_connection, cache_link);
1011
1012 if (!local->kill_all_client_conns) {
1013 /* If the number of connections is over the reap limit, we
1014 * expedite discard by reducing the expiry timeout. We must,
1015 * however, have at least a short grace period to be able to do
1016 * final-ACK or ABORT retransmission.
1017 */
1018 expiry = rxrpc_conn_idle_client_expiry;
1019 if (nr_conns > rxrpc_reap_client_connections)

--- 7 unchanged lines hidden (view full) ---

1027 if (time_after(conn_expires_at, now))
1028 goto not_yet_expired;
1029 }
1030
1031 atomic_dec(&conn->active);
1032 trace_rxrpc_client(conn, -1, rxrpc_client_discard);
1033 list_del_init(&conn->cache_link);
1034
748 if (!local->kill_all_client_conns) {
749 /* If the number of connections is over the reap limit, we
750 * expedite discard by reducing the expiry timeout. We must,
751 * however, have at least a short grace period to be able to do
752 * final-ACK or ABORT retransmission.
753 */
754 expiry = rxrpc_conn_idle_client_expiry;
755 if (nr_conns > rxrpc_reap_client_connections)

--- 7 unchanged lines hidden (view full) ---

763 if (time_after(conn_expires_at, now))
764 goto not_yet_expired;
765 }
766
767 atomic_dec(&conn->active);
768 trace_rxrpc_client(conn, -1, rxrpc_client_discard);
769 list_del_init(&conn->cache_link);
770
1035 spin_unlock(&local->client_conn_cache_lock);
1036
1037 rxrpc_unbundle_conn(conn);
1038 /* Drop the ->cache_link ref */
1039 rxrpc_put_connection(conn, rxrpc_conn_put_discard_idle);
1040
1041 nr_conns--;
1042 goto next;
1043
1044not_yet_expired:
1045 /* The connection at the front of the queue hasn't yet expired, so
1046 * schedule the work item for that point if we discarded something.
1047 *
1048 * We don't worry if the work item is already scheduled - it can look
1049 * after rescheduling itself at a later time. We could cancel it, but
1050 * then things get messier.
1051 */
1052 _debug("not yet");
1053 if (!local->kill_all_client_conns)
1054 timer_reduce(&local->client_conn_reap_timer, conn_expires_at);
1055
771 rxrpc_unbundle_conn(conn);
772 /* Drop the ->cache_link ref */
773 rxrpc_put_connection(conn, rxrpc_conn_put_discard_idle);
774
775 nr_conns--;
776 goto next;
777
778not_yet_expired:
779 /* The connection at the front of the queue hasn't yet expired, so
780 * schedule the work item for that point if we discarded something.
781 *
782 * We don't worry if the work item is already scheduled - it can look
783 * after rescheduling itself at a later time. We could cancel it, but
784 * then things get messier.
785 */
786 _debug("not yet");
787 if (!local->kill_all_client_conns)
788 timer_reduce(&local->client_conn_reap_timer, conn_expires_at);
789
1056out:
1057 spin_unlock(&local->client_conn_cache_lock);
1058 _leave("");
1059}
1060
1061/*
1062 * Clean up the client connections on a local endpoint.
1063 */
1064void rxrpc_clean_up_local_conns(struct rxrpc_local *local)
1065{
790 _leave("");
791}
792
793/*
794 * Clean up the client connections on a local endpoint.
795 */
796void rxrpc_clean_up_local_conns(struct rxrpc_local *local)
797{
1066 struct rxrpc_connection *conn, *tmp;
1067 LIST_HEAD(graveyard);
798 struct rxrpc_connection *conn;
1068
1069 _enter("");
1070
799
800 _enter("");
801
1071 spin_lock(&local->client_conn_cache_lock);
1072 local->kill_all_client_conns = true;
802 local->kill_all_client_conns = true;
1073 spin_unlock(&local->client_conn_cache_lock);
1074
1075 del_timer_sync(&local->client_conn_reap_timer);
1076
803
804 del_timer_sync(&local->client_conn_reap_timer);
805
1077 spin_lock(&local->client_conn_cache_lock);
1078
1079 list_for_each_entry_safe(conn, tmp, &local->idle_client_conns,
1080 cache_link) {
1081 if (conn->local == local) {
1082 atomic_dec(&conn->active);
1083 trace_rxrpc_client(conn, -1, rxrpc_client_discard);
1084 list_move(&conn->cache_link, &graveyard);
1085 }
1086 }
1087
1088 spin_unlock(&local->client_conn_cache_lock);
1089
1090 while (!list_empty(&graveyard)) {
1091 conn = list_entry(graveyard.next,
1092 struct rxrpc_connection, cache_link);
806 while ((conn = list_first_entry_or_null(&local->idle_client_conns,
807 struct rxrpc_connection, cache_link))) {
1093 list_del_init(&conn->cache_link);
808 list_del_init(&conn->cache_link);
809 atomic_dec(&conn->active);
810 trace_rxrpc_client(conn, -1, rxrpc_client_discard);
1094 rxrpc_unbundle_conn(conn);
1095 rxrpc_put_connection(conn, rxrpc_conn_put_local_dead);
1096 }
1097
1098 _leave(" [culled]");
1099}
811 rxrpc_unbundle_conn(conn);
812 rxrpc_put_connection(conn, rxrpc_conn_put_local_dead);
813 }
814
815 _leave(" [culled]");
816}