blob: 1ed18d8c9c9fa31ac46028089184519624625a51 [file] [log] [blame]
David Howells17926a72007-04-26 15:48:28 -07001/* RxRPC individual remote procedure call handling
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
Joe Perches9b6d5392016-06-02 12:08:52 -070012#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
David Howells17926a72007-04-26 15:48:28 -070015#include <linux/module.h>
16#include <linux/circ_buf.h>
Tim Smith77276402014-03-03 23:04:45 +000017#include <linux/spinlock_types.h>
David Howells17926a72007-04-26 15:48:28 -070018#include <net/sock.h>
19#include <net/af_rxrpc.h>
20#include "ar-internal.h"
21
David Howells5b8848d2016-03-04 15:53:46 +000022const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
David Howellsf5c17aa2016-08-30 09:49:28 +010023 [RXRPC_CALL_UNINITIALISED] = "Uninit ",
David Howells999b69f2016-06-17 15:42:35 +010024 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
David Howells1f8481d2007-05-22 16:14:24 -070025 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
26 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
27 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
David Howells00e90712016-09-08 11:10:12 +010028 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
David Howells1f8481d2007-05-22 16:14:24 -070029 [RXRPC_CALL_SERVER_SECURING] = "SvSecure",
30 [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
31 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
32 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
33 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
34 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
35 [RXRPC_CALL_COMPLETE] = "Complete",
David Howellsf5c17aa2016-08-30 09:49:28 +010036};
37
38const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
39 [RXRPC_CALL_SUCCEEDED] = "Complete",
David Howells1f8481d2007-05-22 16:14:24 -070040 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
41 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
David Howellsf5c17aa2016-08-30 09:49:28 +010042 [RXRPC_CALL_LOCAL_ERROR] = "LocError",
David Howells1f8481d2007-05-22 16:14:24 -070043 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
David Howells1f8481d2007-05-22 16:14:24 -070044};
45
David Howellsfff72422016-09-07 14:34:21 +010046const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = {
47 [rxrpc_call_new_client] = "NWc",
48 [rxrpc_call_new_service] = "NWs",
49 [rxrpc_call_queued] = "QUE",
50 [rxrpc_call_queued_ref] = "QUR",
David Howellsa84a46d2016-09-17 10:49:14 +010051 [rxrpc_call_connected] = "CON",
52 [rxrpc_call_release] = "RLS",
David Howellsfff72422016-09-07 14:34:21 +010053 [rxrpc_call_seen] = "SEE",
54 [rxrpc_call_got] = "GOT",
David Howellsfff72422016-09-07 14:34:21 +010055 [rxrpc_call_got_userid] = "Gus",
David Howellscbd00892016-09-13 09:12:34 +010056 [rxrpc_call_got_kernel] = "Gke",
David Howellsfff72422016-09-07 14:34:21 +010057 [rxrpc_call_put] = "PUT",
David Howellsfff72422016-09-07 14:34:21 +010058 [rxrpc_call_put_userid] = "Pus",
David Howellscbd00892016-09-13 09:12:34 +010059 [rxrpc_call_put_kernel] = "Pke",
David Howellsfff72422016-09-07 14:34:21 +010060 [rxrpc_call_put_noqueue] = "PNQ",
David Howellsa84a46d2016-09-17 10:49:14 +010061 [rxrpc_call_error] = "*E*",
David Howellsfff72422016-09-07 14:34:21 +010062};
63
David Howells17926a72007-04-26 15:48:28 -070064struct kmem_cache *rxrpc_call_jar;
65LIST_HEAD(rxrpc_calls);
66DEFINE_RWLOCK(rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -070067
David Howells248f2192016-09-08 11:10:12 +010068static void rxrpc_call_timer_expired(unsigned long _call)
69{
70 struct rxrpc_call *call = (struct rxrpc_call *)_call;
71
72 _enter("%d", call->debug_id);
73
David Howells405dea12016-09-30 09:13:50 +010074 if (call->state < RXRPC_CALL_COMPLETE)
75 rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real());
David Howells248f2192016-09-08 11:10:12 +010076}
David Howells17926a72007-04-26 15:48:28 -070077
78/*
David Howells2341e072016-06-09 23:02:51 +010079 * find an extant server call
80 * - called in process context with IRQs enabled
81 */
82struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
83 unsigned long user_call_ID)
84{
85 struct rxrpc_call *call;
86 struct rb_node *p;
87
88 _enter("%p,%lx", rx, user_call_ID);
89
90 read_lock(&rx->call_lock);
91
92 p = rx->calls.rb_node;
93 while (p) {
94 call = rb_entry(p, struct rxrpc_call, sock_node);
95
96 if (user_call_ID < call->user_call_ID)
97 p = p->rb_left;
98 else if (user_call_ID > call->user_call_ID)
99 p = p->rb_right;
100 else
101 goto found_extant_call;
102 }
103
104 read_unlock(&rx->call_lock);
105 _leave(" = NULL");
106 return NULL;
107
108found_extant_call:
David Howellsfff72422016-09-07 14:34:21 +0100109 rxrpc_get_call(call, rxrpc_call_got);
David Howells2341e072016-06-09 23:02:51 +0100110 read_unlock(&rx->call_lock);
111 _leave(" = %p [%d]", call, atomic_read(&call->usage));
112 return call;
113}
114
115/*
David Howells17926a72007-04-26 15:48:28 -0700116 * allocate a new call
117 */
David Howells00e90712016-09-08 11:10:12 +0100118struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
David Howells17926a72007-04-26 15:48:28 -0700119{
120 struct rxrpc_call *call;
121
122 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
123 if (!call)
124 return NULL;
125
David Howells248f2192016-09-08 11:10:12 +0100126 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
127 sizeof(struct sk_buff *),
David Howells17926a72007-04-26 15:48:28 -0700128 gfp);
David Howells248f2192016-09-08 11:10:12 +0100129 if (!call->rxtx_buffer)
130 goto nomem;
David Howells17926a72007-04-26 15:48:28 -0700131
David Howells248f2192016-09-08 11:10:12 +0100132 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
133 if (!call->rxtx_annotations)
134 goto nomem_2;
135
136 setup_timer(&call->timer, rxrpc_call_timer_expired,
137 (unsigned long)call);
David Howells17926a72007-04-26 15:48:28 -0700138 INIT_WORK(&call->processor, &rxrpc_process_call);
David Howells999b69f2016-06-17 15:42:35 +0100139 INIT_LIST_HEAD(&call->link);
David Howells45025bc2016-08-24 07:30:52 +0100140 INIT_LIST_HEAD(&call->chan_wait_link);
David Howells17926a72007-04-26 15:48:28 -0700141 INIT_LIST_HEAD(&call->accept_link);
David Howells248f2192016-09-08 11:10:12 +0100142 INIT_LIST_HEAD(&call->recvmsg_link);
143 INIT_LIST_HEAD(&call->sock_link);
David Howells45025bc2016-08-24 07:30:52 +0100144 init_waitqueue_head(&call->waitq);
David Howells17926a72007-04-26 15:48:28 -0700145 spin_lock_init(&call->lock);
146 rwlock_init(&call->state_lock);
147 atomic_set(&call->usage, 1);
148 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
David Howells17926a72007-04-26 15:48:28 -0700149
150 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
151
David Howells248f2192016-09-08 11:10:12 +0100152 /* Leave space in the ring to handle a maxed-out jumbo packet */
David Howells75e42122016-09-13 22:36:22 +0100153 call->rx_winsize = rxrpc_rx_window_size;
David Howells248f2192016-09-08 11:10:12 +0100154 call->tx_winsize = 16;
155 call->rx_expect_next = 1;
David Howells57494342016-09-24 18:05:27 +0100156
157 if (RXRPC_TX_SMSS > 2190)
158 call->cong_cwnd = 2;
159 else if (RXRPC_TX_SMSS > 1095)
160 call->cong_cwnd = 3;
161 else
162 call->cong_cwnd = 4;
163 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
David Howells17926a72007-04-26 15:48:28 -0700164 return call;
David Howells248f2192016-09-08 11:10:12 +0100165
166nomem_2:
167 kfree(call->rxtx_buffer);
168nomem:
169 kmem_cache_free(rxrpc_call_jar, call);
170 return NULL;
David Howells17926a72007-04-26 15:48:28 -0700171}
172
173/*
David Howells999b69f2016-06-17 15:42:35 +0100174 * Allocate a new client call.
David Howells17926a72007-04-26 15:48:28 -0700175 */
David Howells248f2192016-09-08 11:10:12 +0100176static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
David Howellsaa390bb2016-06-17 10:06:56 +0100177 gfp_t gfp)
David Howells17926a72007-04-26 15:48:28 -0700178{
179 struct rxrpc_call *call;
David Howells57494342016-09-24 18:05:27 +0100180 ktime_t now;
David Howells17926a72007-04-26 15:48:28 -0700181
182 _enter("");
183
David Howells17926a72007-04-26 15:48:28 -0700184 call = rxrpc_alloc_call(gfp);
185 if (!call)
186 return ERR_PTR(-ENOMEM);
David Howells999b69f2016-06-17 15:42:35 +0100187 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
David Howells999b69f2016-06-17 15:42:35 +0100188 call->service_id = srx->srx_service;
David Howells71f3ca42016-09-17 10:49:14 +0100189 call->tx_phase = true;
David Howells57494342016-09-24 18:05:27 +0100190 now = ktime_get_real();
191 call->acks_latest_ts = now;
192 call->cong_tstamp = now;
David Howells999b69f2016-06-17 15:42:35 +0100193
194 _leave(" = %p", call);
195 return call;
196}
197
198/*
David Howells248f2192016-09-08 11:10:12 +0100199 * Initiate the call ack/resend/expiry timer.
David Howells999b69f2016-06-17 15:42:35 +0100200 */
David Howells248f2192016-09-08 11:10:12 +0100201static void rxrpc_start_call_timer(struct rxrpc_call *call)
David Howells999b69f2016-06-17 15:42:35 +0100202{
David Howellsdf0adc72016-09-26 22:12:49 +0100203 ktime_t now = ktime_get_real(), expire_at;
David Howells999b69f2016-06-17 15:42:35 +0100204
David Howellsdf0adc72016-09-26 22:12:49 +0100205 expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime);
David Howells248f2192016-09-08 11:10:12 +0100206 call->expire_at = expire_at;
207 call->ack_at = expire_at;
David Howellsa5af7e12016-10-06 08:11:49 +0100208 call->ping_at = expire_at;
David Howells248f2192016-09-08 11:10:12 +0100209 call->resend_at = expire_at;
David Howellsdf0adc72016-09-26 22:12:49 +0100210 call->timer.expires = jiffies + LONG_MAX / 2;
211 rxrpc_set_timer(call, rxrpc_timer_begin, now);
David Howells17926a72007-04-26 15:48:28 -0700212}
213
214/*
215 * set up a call for the given data
216 * - called in process context with IRQs enabled
217 */
David Howells2341e072016-06-09 23:02:51 +0100218struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
David Howells19ffa012016-04-04 14:00:36 +0100219 struct rxrpc_conn_parameters *cp,
David Howells999b69f2016-06-17 15:42:35 +0100220 struct sockaddr_rxrpc *srx,
David Howells17926a72007-04-26 15:48:28 -0700221 unsigned long user_call_ID,
David Howells17926a72007-04-26 15:48:28 -0700222 gfp_t gfp)
223{
David Howells2341e072016-06-09 23:02:51 +0100224 struct rxrpc_call *call, *xcall;
225 struct rb_node *parent, **pp;
David Howellse34d4232016-08-30 09:49:29 +0100226 const void *here = __builtin_return_address(0);
David Howells999b69f2016-06-17 15:42:35 +0100227 int ret;
David Howells17926a72007-04-26 15:48:28 -0700228
David Howells999b69f2016-06-17 15:42:35 +0100229 _enter("%p,%lx", rx, user_call_ID);
David Howells17926a72007-04-26 15:48:28 -0700230
David Howells248f2192016-09-08 11:10:12 +0100231 call = rxrpc_alloc_client_call(srx, gfp);
David Howells2341e072016-06-09 23:02:51 +0100232 if (IS_ERR(call)) {
233 _leave(" = %ld", PTR_ERR(call));
234 return call;
David Howells17926a72007-04-26 15:48:28 -0700235 }
236
David Howellsa84a46d2016-09-17 10:49:14 +0100237 trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
238 here, (const void *)user_call_ID);
David Howellse34d4232016-08-30 09:49:29 +0100239
David Howells999b69f2016-06-17 15:42:35 +0100240 /* Publish the call, even though it is incompletely set up as yet */
David Howells17926a72007-04-26 15:48:28 -0700241 write_lock(&rx->call_lock);
242
243 pp = &rx->calls.rb_node;
244 parent = NULL;
245 while (*pp) {
246 parent = *pp;
David Howells2341e072016-06-09 23:02:51 +0100247 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
David Howells17926a72007-04-26 15:48:28 -0700248
David Howells2341e072016-06-09 23:02:51 +0100249 if (user_call_ID < xcall->user_call_ID)
David Howells17926a72007-04-26 15:48:28 -0700250 pp = &(*pp)->rb_left;
David Howells2341e072016-06-09 23:02:51 +0100251 else if (user_call_ID > xcall->user_call_ID)
David Howells17926a72007-04-26 15:48:28 -0700252 pp = &(*pp)->rb_right;
253 else
David Howells357f5ef2016-09-17 10:49:12 +0100254 goto error_dup_user_ID;
David Howells17926a72007-04-26 15:48:28 -0700255 }
256
David Howells248f2192016-09-08 11:10:12 +0100257 rcu_assign_pointer(call->socket, rx);
David Howells357f5ef2016-09-17 10:49:12 +0100258 call->user_call_ID = user_call_ID;
259 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
David Howellsfff72422016-09-07 14:34:21 +0100260 rxrpc_get_call(call, rxrpc_call_got_userid);
David Howells17926a72007-04-26 15:48:28 -0700261 rb_link_node(&call->sock_node, parent, pp);
262 rb_insert_color(&call->sock_node, &rx->calls);
David Howells248f2192016-09-08 11:10:12 +0100263 list_add(&call->sock_link, &rx->sock_calls);
264
David Howells17926a72007-04-26 15:48:28 -0700265 write_unlock(&rx->call_lock);
266
David Howells248f2192016-09-08 11:10:12 +0100267 write_lock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700268 list_add_tail(&call->link, &rxrpc_calls);
David Howells248f2192016-09-08 11:10:12 +0100269 write_unlock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700270
David Howells248f2192016-09-08 11:10:12 +0100271 /* Set up or get a connection record and set the protocol parameters,
272 * including channel number and call ID.
273 */
274 ret = rxrpc_connect_call(call, cp, srx, gfp);
David Howells999b69f2016-06-17 15:42:35 +0100275 if (ret < 0)
276 goto error;
277
David Howellsa84a46d2016-09-17 10:49:14 +0100278 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
David Howells54fde422016-10-13 08:39:52 +0100279 here, NULL);
David Howellsa84a46d2016-09-17 10:49:14 +0100280
David Howells248f2192016-09-08 11:10:12 +0100281 spin_lock_bh(&call->conn->params.peer->lock);
282 hlist_add_head(&call->error_link,
283 &call->conn->params.peer->error_targets);
284 spin_unlock_bh(&call->conn->params.peer->lock);
285
286 rxrpc_start_call_timer(call);
287
David Howells17926a72007-04-26 15:48:28 -0700288 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
289
290 _leave(" = %p [new]", call);
291 return call;
292
David Howells2341e072016-06-09 23:02:51 +0100293 /* We unexpectedly found the user ID in the list after taking
294 * the call_lock. This shouldn't happen unless the user races
295 * with itself and tries to add the same user ID twice at the
296 * same time in different threads.
297 */
David Howells357f5ef2016-09-17 10:49:12 +0100298error_dup_user_ID:
David Howells17926a72007-04-26 15:48:28 -0700299 write_unlock(&rx->call_lock);
David Howells8d94aa32016-09-07 09:19:31 +0100300 ret = -EEXIST;
David Howells357f5ef2016-09-17 10:49:12 +0100301
302error:
303 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
304 RX_CALL_DEAD, ret);
David Howellsa84a46d2016-09-17 10:49:14 +0100305 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
306 here, ERR_PTR(ret));
David Howells357f5ef2016-09-17 10:49:12 +0100307 rxrpc_release_call(rx, call);
308 rxrpc_put_call(call, rxrpc_call_put);
309 _leave(" = %d", ret);
310 return ERR_PTR(ret);
David Howells17926a72007-04-26 15:48:28 -0700311}
312
313/*
David Howells248f2192016-09-08 11:10:12 +0100314 * Set up an incoming call. call->conn points to the connection.
315 * This is called in BH context and isn't allowed to fail.
David Howells17926a72007-04-26 15:48:28 -0700316 */
David Howells248f2192016-09-08 11:10:12 +0100317void rxrpc_incoming_call(struct rxrpc_sock *rx,
318 struct rxrpc_call *call,
319 struct sk_buff *skb)
David Howells17926a72007-04-26 15:48:28 -0700320{
David Howells248f2192016-09-08 11:10:12 +0100321 struct rxrpc_connection *conn = call->conn;
David Howells42886ff2016-06-16 13:31:07 +0100322 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
David Howells248f2192016-09-08 11:10:12 +0100323 u32 chan;
David Howells17926a72007-04-26 15:48:28 -0700324
David Howells248f2192016-09-08 11:10:12 +0100325 _enter(",%d", call->conn->debug_id);
David Howells17926a72007-04-26 15:48:28 -0700326
David Howells248f2192016-09-08 11:10:12 +0100327 rcu_assign_pointer(call->socket, rx);
328 call->call_id = sp->hdr.callNumber;
329 call->service_id = sp->hdr.serviceId;
330 call->cid = sp->hdr.cid;
331 call->state = RXRPC_CALL_SERVER_ACCEPTING;
332 if (sp->hdr.securityIndex > 0)
333 call->state = RXRPC_CALL_SERVER_SECURING;
David Howells57494342016-09-24 18:05:27 +0100334 call->cong_tstamp = skb->tstamp;
David Howells17926a72007-04-26 15:48:28 -0700335
David Howells248f2192016-09-08 11:10:12 +0100336 /* Set the channel for this call. We don't get channel_lock as we're
337 * only defending against the data_ready handler (which we're called
338 * from) and the RESPONSE packet parser (which is only really
339 * interested in call_counter and can cope with a disagreement with the
340 * call pointer).
David Howellsa1399f82016-06-27 14:39:44 +0100341 */
David Howells248f2192016-09-08 11:10:12 +0100342 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
343 conn->channels[chan].call_counter = call->call_id;
344 conn->channels[chan].call_id = call->call_id;
David Howellsa1399f82016-06-27 14:39:44 +0100345 rcu_assign_pointer(conn->channels[chan].call, call);
David Howells17926a72007-04-26 15:48:28 -0700346
David Howells85f32272016-04-04 14:00:36 +0100347 spin_lock(&conn->params.peer->lock);
348 hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
349 spin_unlock(&conn->params.peer->lock);
David Howells17926a72007-04-26 15:48:28 -0700350
David Howells17926a72007-04-26 15:48:28 -0700351 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
352
David Howells248f2192016-09-08 11:10:12 +0100353 rxrpc_start_call_timer(call);
354 _leave("");
David Howells17926a72007-04-26 15:48:28 -0700355}
356
357/*
David Howells8d94aa32016-09-07 09:19:31 +0100358 * Queue a call's work processor, getting a ref to pass to the work queue.
359 */
360bool rxrpc_queue_call(struct rxrpc_call *call)
361{
362 const void *here = __builtin_return_address(0);
363 int n = __atomic_add_unless(&call->usage, 1, 0);
David Howells8d94aa32016-09-07 09:19:31 +0100364 if (n == 0)
365 return false;
366 if (rxrpc_queue_work(&call->processor))
David Howells2ab27212016-09-08 11:10:12 +0100367 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
David Howells8d94aa32016-09-07 09:19:31 +0100368 else
369 rxrpc_put_call(call, rxrpc_call_put_noqueue);
370 return true;
371}
372
373/*
374 * Queue a call's work processor, passing the callers ref to the work queue.
375 */
376bool __rxrpc_queue_call(struct rxrpc_call *call)
377{
378 const void *here = __builtin_return_address(0);
379 int n = atomic_read(&call->usage);
David Howells8d94aa32016-09-07 09:19:31 +0100380 ASSERTCMP(n, >=, 1);
381 if (rxrpc_queue_work(&call->processor))
David Howells2ab27212016-09-08 11:10:12 +0100382 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
David Howells8d94aa32016-09-07 09:19:31 +0100383 else
384 rxrpc_put_call(call, rxrpc_call_put_noqueue);
385 return true;
386}
387
388/*
David Howellse34d4232016-08-30 09:49:29 +0100389 * Note the re-emergence of a call.
390 */
391void rxrpc_see_call(struct rxrpc_call *call)
392{
393 const void *here = __builtin_return_address(0);
394 if (call) {
395 int n = atomic_read(&call->usage);
David Howellse34d4232016-08-30 09:49:29 +0100396
David Howells2ab27212016-09-08 11:10:12 +0100397 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
David Howellse34d4232016-08-30 09:49:29 +0100398 }
399}
400
401/*
402 * Note the addition of a ref on a call.
403 */
David Howellsfff72422016-09-07 14:34:21 +0100404void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
David Howellse34d4232016-08-30 09:49:29 +0100405{
406 const void *here = __builtin_return_address(0);
407 int n = atomic_inc_return(&call->usage);
David Howellse34d4232016-08-30 09:49:29 +0100408
David Howells2ab27212016-09-08 11:10:12 +0100409 trace_rxrpc_call(call, op, n, here, NULL);
David Howellse34d4232016-08-30 09:49:29 +0100410}
411
412/*
David Howells248f2192016-09-08 11:10:12 +0100413 * Detach a call from its owning socket.
David Howells17926a72007-04-26 15:48:28 -0700414 */
David Howells8d94aa32016-09-07 09:19:31 +0100415void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
David Howells17926a72007-04-26 15:48:28 -0700416{
David Howellsa84a46d2016-09-17 10:49:14 +0100417 const void *here = __builtin_return_address(0);
David Howells248f2192016-09-08 11:10:12 +0100418 struct rxrpc_connection *conn = call->conn;
419 bool put = false;
420 int i;
421
422 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
423
David Howellsa84a46d2016-09-17 10:49:14 +0100424 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
425 here, (const void *)call->flags);
David Howells17926a72007-04-26 15:48:28 -0700426
David Howellsa84a46d2016-09-17 10:49:14 +0100427 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
David Howellse34d4232016-08-30 09:49:29 +0100428
David Howells17926a72007-04-26 15:48:28 -0700429 spin_lock_bh(&call->lock);
430 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
431 BUG();
432 spin_unlock_bh(&call->lock);
433
David Howells248f2192016-09-08 11:10:12 +0100434 del_timer_sync(&call->timer);
David Howells17926a72007-04-26 15:48:28 -0700435
David Howells248f2192016-09-08 11:10:12 +0100436 /* Make sure we don't get any more notifications */
437 write_lock_bh(&rx->recvmsg_lock);
David Howellse653cfe2016-04-04 14:00:38 +0100438
David Howells248f2192016-09-08 11:10:12 +0100439 if (!list_empty(&call->recvmsg_link)) {
David Howells17926a72007-04-26 15:48:28 -0700440 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
441 call, call->events, call->flags);
David Howells248f2192016-09-08 11:10:12 +0100442 list_del(&call->recvmsg_link);
443 put = true;
444 }
445
446 /* list_empty() must return false in rxrpc_notify_socket() */
447 call->recvmsg_link.next = NULL;
448 call->recvmsg_link.prev = NULL;
449
450 write_unlock_bh(&rx->recvmsg_lock);
451 if (put)
452 rxrpc_put_call(call, rxrpc_call_put);
453
454 write_lock(&rx->call_lock);
455
456 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
David Howells17926a72007-04-26 15:48:28 -0700457 rb_erase(&call->sock_node, &rx->calls);
458 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
David Howells8d94aa32016-09-07 09:19:31 +0100459 rxrpc_put_call(call, rxrpc_call_put_userid);
David Howells17926a72007-04-26 15:48:28 -0700460 }
David Howells17926a72007-04-26 15:48:28 -0700461
David Howells248f2192016-09-08 11:10:12 +0100462 list_del(&call->sock_link);
463 write_unlock(&rx->call_lock);
David Howells651350d2007-04-26 15:50:17 -0700464
David Howells248f2192016-09-08 11:10:12 +0100465 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
David Howells8d94aa32016-09-07 09:19:31 +0100466
David Howells248f2192016-09-08 11:10:12 +0100467 if (conn)
David Howells8d94aa32016-09-07 09:19:31 +0100468 rxrpc_disconnect_call(call);
David Howellse653cfe2016-04-04 14:00:38 +0100469
David Howells248f2192016-09-08 11:10:12 +0100470 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
David Howells71f3ca42016-09-17 10:49:14 +0100471 rxrpc_free_skb(call->rxtx_buffer[i],
472 (call->tx_phase ? rxrpc_skb_tx_cleaned :
473 rxrpc_skb_rx_cleaned));
David Howells248f2192016-09-08 11:10:12 +0100474 call->rxtx_buffer[i] = NULL;
David Howells17926a72007-04-26 15:48:28 -0700475 }
David Howells17926a72007-04-26 15:48:28 -0700476
477 _leave("");
478}
479
480/*
David Howells17926a72007-04-26 15:48:28 -0700481 * release all the calls associated with a socket
482 */
483void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
484{
485 struct rxrpc_call *call;
David Howells17926a72007-04-26 15:48:28 -0700486
487 _enter("%p", rx);
488
David Howells0360da62016-09-17 10:49:11 +0100489 while (!list_empty(&rx->to_be_accepted)) {
490 call = list_entry(rx->to_be_accepted.next,
491 struct rxrpc_call, accept_link);
492 list_del(&call->accept_link);
493 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET);
David Howells0360da62016-09-17 10:49:11 +0100494 rxrpc_put_call(call, rxrpc_call_put);
495 }
496
David Howells248f2192016-09-08 11:10:12 +0100497 while (!list_empty(&rx->sock_calls)) {
498 call = list_entry(rx->sock_calls.next,
499 struct rxrpc_call, sock_link);
500 rxrpc_get_call(call, rxrpc_call_got);
501 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET);
David Howells26cb02a2016-10-06 08:11:49 +0100502 rxrpc_send_abort_packet(call);
David Howells8d94aa32016-09-07 09:19:31 +0100503 rxrpc_release_call(rx, call);
David Howells248f2192016-09-08 11:10:12 +0100504 rxrpc_put_call(call, rxrpc_call_put);
David Howells17926a72007-04-26 15:48:28 -0700505 }
506
David Howells17926a72007-04-26 15:48:28 -0700507 _leave("");
508}
509
510/*
511 * release a call
512 */
David Howellsfff72422016-09-07 14:34:21 +0100513void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
David Howells17926a72007-04-26 15:48:28 -0700514{
David Howellse34d4232016-08-30 09:49:29 +0100515 const void *here = __builtin_return_address(0);
David Howells2ab27212016-09-08 11:10:12 +0100516 int n;
David Howellse34d4232016-08-30 09:49:29 +0100517
David Howells17926a72007-04-26 15:48:28 -0700518 ASSERT(call != NULL);
519
David Howellse34d4232016-08-30 09:49:29 +0100520 n = atomic_dec_return(&call->usage);
David Howells2ab27212016-09-08 11:10:12 +0100521 trace_rxrpc_call(call, op, n, here, NULL);
David Howellse34d4232016-08-30 09:49:29 +0100522 ASSERTCMP(n, >=, 0);
523 if (n == 0) {
David Howells17926a72007-04-26 15:48:28 -0700524 _debug("call %d dead", call->debug_id);
David Howells248f2192016-09-08 11:10:12 +0100525 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
David Howellse34d4232016-08-30 09:49:29 +0100526
David Howells248f2192016-09-08 11:10:12 +0100527 write_lock(&rxrpc_call_lock);
528 list_del_init(&call->link);
529 write_unlock(&rxrpc_call_lock);
David Howellse34d4232016-08-30 09:49:29 +0100530
David Howells8d94aa32016-09-07 09:19:31 +0100531 rxrpc_cleanup_call(call);
David Howellse34d4232016-08-30 09:49:29 +0100532 }
David Howells17926a72007-04-26 15:48:28 -0700533}
534
535/*
David Howellsdee46362016-06-27 17:11:19 +0100536 * Final call destruction under RCU.
537 */
538static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
539{
540 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
541
David Howellsdf5d8bf2016-08-24 14:31:43 +0100542 rxrpc_put_peer(call->peer);
David Howells248f2192016-09-08 11:10:12 +0100543 kfree(call->rxtx_buffer);
544 kfree(call->rxtx_annotations);
David Howellsdee46362016-06-27 17:11:19 +0100545 kmem_cache_free(rxrpc_call_jar, call);
546}
547
548/*
David Howells17926a72007-04-26 15:48:28 -0700549 * clean up a call
550 */
David Howells00e90712016-09-08 11:10:12 +0100551void rxrpc_cleanup_call(struct rxrpc_call *call)
David Howells17926a72007-04-26 15:48:28 -0700552{
David Howells248f2192016-09-08 11:10:12 +0100553 int i;
David Howells17926a72007-04-26 15:48:28 -0700554
David Howells248f2192016-09-08 11:10:12 +0100555 _net("DESTROY CALL %d", call->debug_id);
David Howells17926a72007-04-26 15:48:28 -0700556
557 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
558
David Howells248f2192016-09-08 11:10:12 +0100559 del_timer_sync(&call->timer);
David Howells17926a72007-04-26 15:48:28 -0700560
David Howells8d94aa32016-09-07 09:19:31 +0100561 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
David Howells17926a72007-04-26 15:48:28 -0700562 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
David Howellse653cfe2016-04-04 14:00:38 +0100563 ASSERTCMP(call->conn, ==, NULL);
David Howells17926a72007-04-26 15:48:28 -0700564
David Howells248f2192016-09-08 11:10:12 +0100565 /* Clean up the Rx/Tx buffer */
566 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
David Howells71f3ca42016-09-17 10:49:14 +0100567 rxrpc_free_skb(call->rxtx_buffer[i],
568 (call->tx_phase ? rxrpc_skb_tx_cleaned :
569 rxrpc_skb_rx_cleaned));
David Howells17926a72007-04-26 15:48:28 -0700570
David Howells71f3ca42016-09-17 10:49:14 +0100571 rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned);
David Howells17926a72007-04-26 15:48:28 -0700572
David Howellsdee46362016-06-27 17:11:19 +0100573 call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
David Howells17926a72007-04-26 15:48:28 -0700574}
575
576/*
David Howells8d94aa32016-09-07 09:19:31 +0100577 * Make sure that all calls are gone.
David Howells17926a72007-04-26 15:48:28 -0700578 */
579void __exit rxrpc_destroy_all_calls(void)
580{
581 struct rxrpc_call *call;
582
583 _enter("");
David Howells8d94aa32016-09-07 09:19:31 +0100584
585 if (list_empty(&rxrpc_calls))
586 return;
David Howells248f2192016-09-08 11:10:12 +0100587
588 write_lock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700589
590 while (!list_empty(&rxrpc_calls)) {
591 call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
592 _debug("Zapping call %p", call);
593
David Howellse34d4232016-08-30 09:49:29 +0100594 rxrpc_see_call(call);
David Howells17926a72007-04-26 15:48:28 -0700595 list_del_init(&call->link);
596
David Howells248f2192016-09-08 11:10:12 +0100597 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
David Howells8d94aa32016-09-07 09:19:31 +0100598 call, atomic_read(&call->usage),
David Howells8d94aa32016-09-07 09:19:31 +0100599 rxrpc_call_states[call->state],
600 call->flags, call->events);
David Howells17926a72007-04-26 15:48:28 -0700601
David Howells248f2192016-09-08 11:10:12 +0100602 write_unlock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700603 cond_resched();
David Howells248f2192016-09-08 11:10:12 +0100604 write_lock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700605 }
606
David Howells248f2192016-09-08 11:10:12 +0100607 write_unlock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700608}