12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 28c3e34a4SDavid Howells /* RxRPC individual remote procedure call handling 38c3e34a4SDavid Howells * 48c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 58c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 68c3e34a4SDavid Howells */ 78c3e34a4SDavid Howells 88c3e34a4SDavid Howells #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 98c3e34a4SDavid Howells 108c3e34a4SDavid Howells #include <linux/slab.h> 118c3e34a4SDavid Howells #include <linux/module.h> 128c3e34a4SDavid Howells #include <linux/circ_buf.h> 138c3e34a4SDavid Howells #include <linux/spinlock_types.h> 148c3e34a4SDavid Howells #include <net/sock.h> 158c3e34a4SDavid Howells #include <net/af_rxrpc.h> 168c3e34a4SDavid Howells #include "ar-internal.h" 178c3e34a4SDavid Howells 188c3e34a4SDavid Howells const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { 19999b69f8SDavid Howells [RXRPC_CALL_UNINITIALISED] = "Uninit ", 20999b69f8SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", 218c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", 228c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", 238c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", 2400e90712SDavid Howells [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", 258c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SECURING] = "SvSecure", 268c3e34a4SDavid Howells [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 278c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 288c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 298c3e34a4SDavid Howells [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 308c3e34a4SDavid Howells [RXRPC_CALL_COMPLETE] = "Complete", 31f5c17aaeSDavid Howells }; 32f5c17aaeSDavid Howells 33f5c17aaeSDavid Howells const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 34f5c17aaeSDavid Howells [RXRPC_CALL_SUCCEEDED] = "Complete", 358c3e34a4SDavid Howells [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 368c3e34a4SDavid Howells [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 37f5c17aaeSDavid Howells [RXRPC_CALL_LOCAL_ERROR] = "LocError", 388c3e34a4SDavid Howells [RXRPC_CALL_NETWORK_ERROR] = "NetError", 398c3e34a4SDavid Howells }; 408c3e34a4SDavid Howells 418c3e34a4SDavid Howells struct kmem_cache *rxrpc_call_jar; 428c3e34a4SDavid Howells 43b7a7d674SDavid Howells static struct semaphore rxrpc_call_limiter = 44b7a7d674SDavid Howells __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000); 45b7a7d674SDavid Howells static struct semaphore rxrpc_kernel_call_limiter = 46b7a7d674SDavid Howells __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000); 47b7a7d674SDavid Howells 4815f661dcSDavid Howells void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what) 4915f661dcSDavid Howells { 50f3441d41SDavid Howells struct rxrpc_local *local = call->local; 5115f661dcSDavid Howells bool busy; 5215f661dcSDavid Howells 5303fc55adSDavid Howells if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) { 5415f661dcSDavid Howells spin_lock_bh(&local->lock); 5515f661dcSDavid Howells busy = !list_empty(&call->attend_link); 5615f661dcSDavid Howells trace_rxrpc_poke_call(call, busy, what); 57a33395abSDavid Howells if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke)) 58a33395abSDavid Howells busy = true; 5915f661dcSDavid Howells if (!busy) { 6015f661dcSDavid Howells list_add_tail(&call->attend_link, &local->call_attend_q); 6115f661dcSDavid Howells } 6215f661dcSDavid Howells spin_unlock_bh(&local->lock); 63a33395abSDavid Howells if (!busy) 6415f661dcSDavid Howells rxrpc_wake_up_io_thread(local); 6515f661dcSDavid Howells } 6615f661dcSDavid Howells } 6715f661dcSDavid Howells 68e99e88a9SKees Cook static void rxrpc_call_timer_expired(struct timer_list *t) 69248f219cSDavid Howells { 70e99e88a9SKees Cook struct rxrpc_call *call = from_timer(call, t, timer); 71248f219cSDavid Howells 72248f219cSDavid Howells _enter("%d", call->debug_id); 73248f219cSDavid Howells 7496b4059fSDavid Howells if (!__rxrpc_call_is_complete(call)) { 75334dfbfcSDavid Howells trace_rxrpc_timer_expired(call, jiffies); 765e6ef4f1SDavid Howells rxrpc_poke_call(call, rxrpc_call_poke_timer); 77fc7ab6d2SDavid Howells } 78248f219cSDavid Howells } 798c3e34a4SDavid Howells 804a7f62f9SDavid Howells void rxrpc_reduce_call_timer(struct rxrpc_call *call, 814a7f62f9SDavid Howells unsigned long expire_at, 824a7f62f9SDavid Howells unsigned long now, 834a7f62f9SDavid Howells enum rxrpc_timer_trace why) 844a7f62f9SDavid Howells { 854a7f62f9SDavid Howells trace_rxrpc_timer(call, why, now); 863feda9d6SDavid Howells timer_reduce(&call->timer, expire_at); 874a7f62f9SDavid Howells } 884a7f62f9SDavid Howells 899faaff59SDavid Howells static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 908c3e34a4SDavid Howells 913feda9d6SDavid Howells static void rxrpc_destroy_call(struct work_struct *); 923feda9d6SDavid Howells 938c3e34a4SDavid Howells /* 948c3e34a4SDavid Howells * find an extant server call 958c3e34a4SDavid Howells * - called in process context with IRQs enabled 968c3e34a4SDavid Howells */ 978c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 988c3e34a4SDavid Howells unsigned long user_call_ID) 998c3e34a4SDavid Howells { 1008c3e34a4SDavid Howells struct rxrpc_call *call; 1018c3e34a4SDavid Howells struct rb_node *p; 1028c3e34a4SDavid Howells 1038c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 1048c3e34a4SDavid Howells 1058c3e34a4SDavid Howells read_lock(&rx->call_lock); 1068c3e34a4SDavid Howells 1078c3e34a4SDavid Howells p = rx->calls.rb_node; 1088c3e34a4SDavid Howells while (p) { 1098c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 1108c3e34a4SDavid Howells 1118c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 1128c3e34a4SDavid Howells p = p->rb_left; 1138c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 1148c3e34a4SDavid Howells p = p->rb_right; 1158c3e34a4SDavid Howells else 1168c3e34a4SDavid Howells goto found_extant_call; 1178c3e34a4SDavid Howells } 1188c3e34a4SDavid Howells 1198c3e34a4SDavid Howells read_unlock(&rx->call_lock); 1208c3e34a4SDavid Howells _leave(" = NULL"); 1218c3e34a4SDavid Howells return NULL; 1228c3e34a4SDavid Howells 1238c3e34a4SDavid Howells found_extant_call: 124cb0fc0c9SDavid Howells rxrpc_get_call(call, rxrpc_call_get_sendmsg); 1258c3e34a4SDavid Howells read_unlock(&rx->call_lock); 126a0575429SDavid Howells _leave(" = %p [%d]", call, refcount_read(&call->ref)); 1278c3e34a4SDavid Howells return call; 1288c3e34a4SDavid Howells } 1298c3e34a4SDavid Howells 1308c3e34a4SDavid Howells /* 1318c3e34a4SDavid Howells * allocate a new call 1328c3e34a4SDavid Howells */ 133a25e21f0SDavid Howells struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 134a25e21f0SDavid Howells unsigned int debug_id) 1358c3e34a4SDavid Howells { 1368c3e34a4SDavid Howells struct rxrpc_call *call; 137d3be4d24SDavid Howells struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 1388c3e34a4SDavid Howells 1398c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1408c3e34a4SDavid Howells if (!call) 1418c3e34a4SDavid Howells return NULL; 1428c3e34a4SDavid Howells 143540b1c48SDavid Howells mutex_init(&call->user_mutex); 1449faaff59SDavid Howells 1459faaff59SDavid Howells /* Prevent lockdep reporting a deadlock false positive between the afs 1469faaff59SDavid Howells * filesystem and sys_sendmsg() via the mmap sem. 1479faaff59SDavid Howells */ 1489faaff59SDavid Howells if (rx->sk.sk_kern_sock) 1499faaff59SDavid Howells lockdep_set_class(&call->user_mutex, 1509faaff59SDavid Howells &rxrpc_call_user_mutex_lock_class_key); 1519faaff59SDavid Howells 152e99e88a9SKees Cook timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 1533feda9d6SDavid Howells INIT_WORK(&call->destroyer, rxrpc_destroy_call); 154999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 1559d35d880SDavid Howells INIT_LIST_HEAD(&call->wait_link); 1568c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 157248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 158248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 15915f661dcSDavid Howells INIT_LIST_HEAD(&call->attend_link); 160cf37b598SDavid Howells INIT_LIST_HEAD(&call->tx_sendmsg); 161a4ea4c47SDavid Howells INIT_LIST_HEAD(&call->tx_buffer); 1625d7edbc9SDavid Howells skb_queue_head_init(&call->recvmsg_queue); 1635d7edbc9SDavid Howells skb_queue_head_init(&call->rx_oos_queue); 16445025bceSDavid Howells init_waitqueue_head(&call->waitq); 16520acbd9aSDavid Howells spin_lock_init(&call->notify_lock); 166a4ea4c47SDavid Howells spin_lock_init(&call->tx_lock); 167a0575429SDavid Howells refcount_set(&call->ref, 1); 168a25e21f0SDavid Howells call->debug_id = debug_id; 169e754eba6SDavid Howells call->tx_total_len = -1; 170a158bdd3SDavid Howells call->next_rx_timo = 20 * HZ; 171a158bdd3SDavid Howells call->next_req_timo = 1 * HZ; 1725bbf9533SDavid Howells call->ackr_window = 1; 1735bbf9533SDavid Howells call->ackr_wtop = 1; 1748c3e34a4SDavid Howells 1758c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1768c3e34a4SDavid Howells 17775e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 178248f219cSDavid Howells call->tx_winsize = 16; 17957494343SDavid Howells 1801fc4fa2aSDavid Howells if (RXRPC_TX_SMSS > 2190) 18157494343SDavid Howells call->cong_cwnd = 2; 1821fc4fa2aSDavid Howells else if (RXRPC_TX_SMSS > 1095) 1831fc4fa2aSDavid Howells call->cong_cwnd = 3; 1841fc4fa2aSDavid Howells else 1851fc4fa2aSDavid Howells call->cong_cwnd = 4; 186a4ea4c47SDavid Howells call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; 187d3be4d24SDavid Howells 188d3be4d24SDavid Howells call->rxnet = rxnet; 1894700c4d8SDavid Howells call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; 190d3be4d24SDavid Howells atomic_inc(&rxnet->nr_calls); 1918c3e34a4SDavid Howells return call; 1928c3e34a4SDavid Howells } 1938c3e34a4SDavid Howells 1948c3e34a4SDavid Howells /* 195999b69f8SDavid Howells * Allocate a new client call. 1968c3e34a4SDavid Howells */ 1979faaff59SDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 1989faaff59SDavid Howells struct sockaddr_rxrpc *srx, 199f3441d41SDavid Howells struct rxrpc_conn_parameters *cp, 200f3441d41SDavid Howells struct rxrpc_call_params *p, 201a25e21f0SDavid Howells gfp_t gfp, 202a25e21f0SDavid Howells unsigned int debug_id) 2038c3e34a4SDavid Howells { 2048c3e34a4SDavid Howells struct rxrpc_call *call; 20557494343SDavid Howells ktime_t now; 206f3441d41SDavid Howells int ret; 2078c3e34a4SDavid Howells 2088c3e34a4SDavid Howells _enter(""); 2098c3e34a4SDavid Howells 210a25e21f0SDavid Howells call = rxrpc_alloc_call(rx, gfp, debug_id); 2118c3e34a4SDavid Howells if (!call) 2128c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 21357494343SDavid Howells now = ktime_get_real(); 21457494343SDavid Howells call->acks_latest_ts = now; 21557494343SDavid Howells call->cong_tstamp = now; 216f3441d41SDavid Howells call->dest_srx = *srx; 217f3441d41SDavid Howells call->interruptibility = p->interruptibility; 218f3441d41SDavid Howells call->tx_total_len = p->tx_total_len; 219f3441d41SDavid Howells call->key = key_get(cp->key); 220f3441d41SDavid Howells call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); 221fdb99487SDavid Howells call->security_level = cp->security_level; 222f3441d41SDavid Howells if (p->kernel) 223f3441d41SDavid Howells __set_bit(RXRPC_CALL_KERNEL, &call->flags); 224f3441d41SDavid Howells if (cp->upgrade) 225f3441d41SDavid Howells __set_bit(RXRPC_CALL_UPGRADE, &call->flags); 226f3441d41SDavid Howells if (cp->exclusive) 227f3441d41SDavid Howells __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags); 228f3441d41SDavid Howells 229*db099c62SDavid Howells if (p->timeouts.normal) 230*db099c62SDavid Howells call->next_rx_timo = min(msecs_to_jiffies(p->timeouts.normal), 1UL); 231*db099c62SDavid Howells if (p->timeouts.idle) 232*db099c62SDavid Howells call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL); 233*db099c62SDavid Howells if (p->timeouts.hard) 234*db099c62SDavid Howells call->hard_timo = p->timeouts.hard * HZ; 235*db099c62SDavid Howells 236f3441d41SDavid Howells ret = rxrpc_init_client_call_security(call); 237f3441d41SDavid Howells if (ret < 0) { 23896b4059fSDavid Howells rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret); 239f3441d41SDavid Howells rxrpc_put_call(call, rxrpc_call_put_discard_error); 240f3441d41SDavid Howells return ERR_PTR(ret); 241f3441d41SDavid Howells } 242f3441d41SDavid Howells 24396b4059fSDavid Howells rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN); 24496b4059fSDavid Howells 245f3441d41SDavid Howells trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 246f3441d41SDavid Howells p->user_call_ID, rxrpc_call_new_client); 247999b69f8SDavid Howells 248999b69f8SDavid Howells _leave(" = %p", call); 249999b69f8SDavid Howells return call; 250999b69f8SDavid Howells } 251999b69f8SDavid Howells 252999b69f8SDavid Howells /* 253248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 254999b69f8SDavid Howells */ 2559d35d880SDavid Howells void rxrpc_start_call_timer(struct rxrpc_call *call) 256999b69f8SDavid Howells { 257a158bdd3SDavid Howells unsigned long now = jiffies; 258a158bdd3SDavid Howells unsigned long j = now + MAX_JIFFY_OFFSET; 259999b69f8SDavid Howells 260530403d9SDavid Howells call->delay_ack_at = j; 261bd1fdf8cSDavid Howells call->ack_lost_at = j; 262a158bdd3SDavid Howells call->resend_at = j; 263a158bdd3SDavid Howells call->ping_at = j; 2645e6ef4f1SDavid Howells call->keepalive_at = j; 265a158bdd3SDavid Howells call->expect_rx_by = j; 266a158bdd3SDavid Howells call->expect_req_by = j; 267*db099c62SDavid Howells call->expect_term_by = j + call->hard_timo; 268a158bdd3SDavid Howells call->timer.expires = now; 2698c3e34a4SDavid Howells } 2708c3e34a4SDavid Howells 2718c3e34a4SDavid Howells /* 272b7a7d674SDavid Howells * Wait for a call slot to become available. 273b7a7d674SDavid Howells */ 274b7a7d674SDavid Howells static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 275b7a7d674SDavid Howells { 276b7a7d674SDavid Howells struct semaphore *limiter = &rxrpc_call_limiter; 277b7a7d674SDavid Howells 278b7a7d674SDavid Howells if (p->kernel) 279b7a7d674SDavid Howells limiter = &rxrpc_kernel_call_limiter; 280b7a7d674SDavid Howells if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 281b7a7d674SDavid Howells down(limiter); 282b7a7d674SDavid Howells return limiter; 283b7a7d674SDavid Howells } 284b7a7d674SDavid Howells return down_interruptible(limiter) < 0 ? NULL : limiter; 285b7a7d674SDavid Howells } 286b7a7d674SDavid Howells 287b7a7d674SDavid Howells /* 288b7a7d674SDavid Howells * Release a call slot. 289b7a7d674SDavid Howells */ 290b7a7d674SDavid Howells static void rxrpc_put_call_slot(struct rxrpc_call *call) 291b7a7d674SDavid Howells { 292b7a7d674SDavid Howells struct semaphore *limiter = &rxrpc_call_limiter; 293b7a7d674SDavid Howells 294b7a7d674SDavid Howells if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 295b7a7d674SDavid Howells limiter = &rxrpc_kernel_call_limiter; 296b7a7d674SDavid Howells up(limiter); 297b7a7d674SDavid Howells } 298b7a7d674SDavid Howells 299b7a7d674SDavid Howells /* 3009d35d880SDavid Howells * Start the process of connecting a call. We obtain a peer and a connection 3019d35d880SDavid Howells * bundle, but the actual association of a call with a connection is offloaded 3029d35d880SDavid Howells * to the I/O thread to simplify locking. 3039d35d880SDavid Howells */ 3049d35d880SDavid Howells static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp) 3059d35d880SDavid Howells { 3069d35d880SDavid Howells struct rxrpc_local *local = call->local; 30701644a1fSDavid Howells int ret = -ENOMEM; 3089d35d880SDavid Howells 3099d35d880SDavid Howells _enter("{%d,%lx},", call->debug_id, call->user_call_ID); 3109d35d880SDavid Howells 3119d35d880SDavid Howells call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp); 3129d35d880SDavid Howells if (!call->peer) 3139d35d880SDavid Howells goto error; 3149d35d880SDavid Howells 3159d35d880SDavid Howells ret = rxrpc_look_up_bundle(call, gfp); 3169d35d880SDavid Howells if (ret < 0) 3179d35d880SDavid Howells goto error; 3189d35d880SDavid Howells 3199d35d880SDavid Howells trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call); 3209d35d880SDavid Howells rxrpc_get_call(call, rxrpc_call_get_io_thread); 3219d35d880SDavid Howells spin_lock(&local->client_call_lock); 3229d35d880SDavid Howells list_add_tail(&call->wait_link, &local->new_client_calls); 3239d35d880SDavid Howells spin_unlock(&local->client_call_lock); 3249d35d880SDavid Howells rxrpc_wake_up_io_thread(local); 3259d35d880SDavid Howells return 0; 3269d35d880SDavid Howells 3279d35d880SDavid Howells error: 3289d35d880SDavid Howells __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 3299d35d880SDavid Howells return ret; 3309d35d880SDavid Howells } 3319d35d880SDavid Howells 3329d35d880SDavid Howells /* 333540b1c48SDavid Howells * Set up a call for the given parameters. 334540b1c48SDavid Howells * - Called with the socket lock held, which it must release. 335540b1c48SDavid Howells * - If it returns a call, the call's lock will need releasing by the caller. 3368c3e34a4SDavid Howells */ 3378c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 33819ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 339999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 34048124178SDavid Howells struct rxrpc_call_params *p, 341a25e21f0SDavid Howells gfp_t gfp, 342a25e21f0SDavid Howells unsigned int debug_id) 343540b1c48SDavid Howells __releases(&rx->sk.sk_lock.slock) 34488f2a825SDavid Howells __acquires(&call->user_mutex) 3458c3e34a4SDavid Howells { 3468c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 347d3be4d24SDavid Howells struct rxrpc_net *rxnet; 348b7a7d674SDavid Howells struct semaphore *limiter; 3498c3e34a4SDavid Howells struct rb_node *parent, **pp; 350999b69f8SDavid Howells int ret; 3518c3e34a4SDavid Howells 35248124178SDavid Howells _enter("%p,%lx", rx, p->user_call_ID); 3538c3e34a4SDavid Howells 354b7a7d674SDavid Howells limiter = rxrpc_get_call_slot(p, gfp); 355b0f571ecSDavid Howells if (!limiter) { 356b0f571ecSDavid Howells release_sock(&rx->sk); 357b7a7d674SDavid Howells return ERR_PTR(-ERESTARTSYS); 358b0f571ecSDavid Howells } 359b7a7d674SDavid Howells 360f3441d41SDavid Howells call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id); 3618c3e34a4SDavid Howells if (IS_ERR(call)) { 362540b1c48SDavid Howells release_sock(&rx->sk); 363b7a7d674SDavid Howells up(limiter); 3648c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 3658c3e34a4SDavid Howells return call; 3668c3e34a4SDavid Howells } 3678c3e34a4SDavid Howells 368540b1c48SDavid Howells /* We need to protect a partially set up call against the user as we 369540b1c48SDavid Howells * will be acting outside the socket lock. 370540b1c48SDavid Howells */ 371540b1c48SDavid Howells mutex_lock(&call->user_mutex); 372540b1c48SDavid Howells 373999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 3748c3e34a4SDavid Howells write_lock(&rx->call_lock); 3758c3e34a4SDavid Howells 3768c3e34a4SDavid Howells pp = &rx->calls.rb_node; 3778c3e34a4SDavid Howells parent = NULL; 3788c3e34a4SDavid Howells while (*pp) { 3798c3e34a4SDavid Howells parent = *pp; 3808c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 3818c3e34a4SDavid Howells 38248124178SDavid Howells if (p->user_call_ID < xcall->user_call_ID) 3838c3e34a4SDavid Howells pp = &(*pp)->rb_left; 38448124178SDavid Howells else if (p->user_call_ID > xcall->user_call_ID) 3858c3e34a4SDavid Howells pp = &(*pp)->rb_right; 3868c3e34a4SDavid Howells else 387357f5ef6SDavid Howells goto error_dup_user_ID; 3888c3e34a4SDavid Howells } 3898c3e34a4SDavid Howells 390248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 39148124178SDavid Howells call->user_call_ID = p->user_call_ID; 392357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 393cb0fc0c9SDavid Howells rxrpc_get_call(call, rxrpc_call_get_userid); 3948c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 3958c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 396248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 397248f219cSDavid Howells 3988c3e34a4SDavid Howells write_unlock(&rx->call_lock); 3998c3e34a4SDavid Howells 400d3be4d24SDavid Howells rxnet = call->rxnet; 4013dd9c8b5SDavid Howells spin_lock(&rxnet->call_lock); 402ad25f5cbSDavid Howells list_add_tail_rcu(&call->link, &rxnet->calls); 4033dd9c8b5SDavid Howells spin_unlock(&rxnet->call_lock); 4048c3e34a4SDavid Howells 405540b1c48SDavid Howells /* From this point on, the call is protected by its own lock. */ 406540b1c48SDavid Howells release_sock(&rx->sk); 407540b1c48SDavid Howells 408248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 409248f219cSDavid Howells * including channel number and call ID. 410248f219cSDavid Howells */ 4111bab27afSDavid Howells ret = rxrpc_connect_call(call, gfp); 412999b69f8SDavid Howells if (ret < 0) 41365550098SDavid Howells goto error_attached_to_socket; 414999b69f8SDavid Howells 4158c3e34a4SDavid Howells _leave(" = %p [new]", call); 4168c3e34a4SDavid Howells return call; 4178c3e34a4SDavid Howells 4188c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 4198c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 4208c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 4218c3e34a4SDavid Howells * same time in different threads. 4228c3e34a4SDavid Howells */ 423357f5ef6SDavid Howells error_dup_user_ID: 4248c3e34a4SDavid Howells write_unlock(&rx->call_lock); 425540b1c48SDavid Howells release_sock(&rx->sk); 42696b4059fSDavid Howells rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST); 427cb0fc0c9SDavid Howells trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, 428cb0fc0c9SDavid Howells rxrpc_call_see_userid_exists); 429540b1c48SDavid Howells mutex_unlock(&call->user_mutex); 430cb0fc0c9SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid_exists); 43165550098SDavid Howells _leave(" = -EEXIST"); 43265550098SDavid Howells return ERR_PTR(-EEXIST); 43365550098SDavid Howells 43465550098SDavid Howells /* We got an error, but the call is attached to the socket and is in 4359d35d880SDavid Howells * need of release. However, we might now race with recvmsg() when it 4369d35d880SDavid Howells * completion notifies the socket. Return 0 from sys_sendmsg() and 43765550098SDavid Howells * leave the error to recvmsg() to deal with. 43865550098SDavid Howells */ 43965550098SDavid Howells error_attached_to_socket: 440cb0fc0c9SDavid Howells trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, 441cb0fc0c9SDavid Howells rxrpc_call_see_connect_failed); 4429d35d880SDavid Howells rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); 44365550098SDavid Howells _leave(" = c=%08x [err]", call->debug_id); 44465550098SDavid Howells return call; 4458c3e34a4SDavid Howells } 4468c3e34a4SDavid Howells 4478c3e34a4SDavid Howells /* 448248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 449248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 4508c3e34a4SDavid Howells */ 451248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 452248f219cSDavid Howells struct rxrpc_call *call, 45342886ffeSDavid Howells struct sk_buff *skb) 4548c3e34a4SDavid Howells { 455248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 45642886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 457248f219cSDavid Howells u32 chan; 4588c3e34a4SDavid Howells 459248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 4608c3e34a4SDavid Howells 461248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 462248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 463f3441d41SDavid Howells call->dest_srx.srx_service = sp->hdr.serviceId; 464248f219cSDavid Howells call->cid = sp->hdr.cid; 46557494343SDavid Howells call->cong_tstamp = skb->tstamp; 4668c3e34a4SDavid Howells 467a343b174SDavid Howells __set_bit(RXRPC_CALL_EXPOSED, &call->flags); 46896b4059fSDavid Howells rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); 469a343b174SDavid Howells 4705e6ef4f1SDavid Howells spin_lock(&conn->state_lock); 4715e6ef4f1SDavid Howells 4725e6ef4f1SDavid Howells switch (conn->state) { 4735e6ef4f1SDavid Howells case RXRPC_CONN_SERVICE_UNSECURED: 4745e6ef4f1SDavid Howells case RXRPC_CONN_SERVICE_CHALLENGING: 47596b4059fSDavid Howells rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); 4765e6ef4f1SDavid Howells break; 4775e6ef4f1SDavid Howells case RXRPC_CONN_SERVICE: 47896b4059fSDavid Howells rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST); 4795e6ef4f1SDavid Howells break; 4805e6ef4f1SDavid Howells 481a00ce28bSDavid Howells case RXRPC_CONN_ABORTED: 48296b4059fSDavid Howells rxrpc_set_call_completion(call, conn->completion, 4835e6ef4f1SDavid Howells conn->abort_code, conn->error); 4845e6ef4f1SDavid Howells break; 4855e6ef4f1SDavid Howells default: 4865e6ef4f1SDavid Howells BUG(); 4875e6ef4f1SDavid Howells } 4885e6ef4f1SDavid Howells 4895040011dSDavid Howells rxrpc_get_call(call, rxrpc_call_get_io_thread); 4905040011dSDavid Howells 491248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 492248f219cSDavid Howells * only defending against the data_ready handler (which we're called 493248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 494248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 495248f219cSDavid Howells * call pointer). 4968c3e34a4SDavid Howells */ 497248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 498248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 499248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 5009d35d880SDavid Howells conn->channels[chan].call = call; 5015e6ef4f1SDavid Howells spin_unlock(&conn->state_lock); 5028c3e34a4SDavid Howells 5032cc80086SDavid Howells spin_lock(&conn->peer->lock); 50429fb4ec3SDavid Howells hlist_add_head(&call->error_link, &conn->peer->error_targets); 5052cc80086SDavid Howells spin_unlock(&conn->peer->lock); 5068c3e34a4SDavid Howells 507248f219cSDavid Howells rxrpc_start_call_timer(call); 508248f219cSDavid Howells _leave(""); 5098c3e34a4SDavid Howells } 5108c3e34a4SDavid Howells 5118c3e34a4SDavid Howells /* 512e34d4234SDavid Howells * Note the re-emergence of a call. 513e34d4234SDavid Howells */ 514cb0fc0c9SDavid Howells void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 515e34d4234SDavid Howells { 516e34d4234SDavid Howells if (call) { 517cb0fc0c9SDavid Howells int r = refcount_read(&call->ref); 518e34d4234SDavid Howells 519cb0fc0c9SDavid Howells trace_rxrpc_call(call->debug_id, r, 0, why); 520e34d4234SDavid Howells } 521e34d4234SDavid Howells } 522e34d4234SDavid Howells 5235e6ef4f1SDavid Howells struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, 5245e6ef4f1SDavid Howells enum rxrpc_call_trace why) 5254a7f62f9SDavid Howells { 526cb0fc0c9SDavid Howells int r; 5274a7f62f9SDavid Howells 5285e6ef4f1SDavid Howells if (!call || !__refcount_inc_not_zero(&call->ref, &r)) 5295e6ef4f1SDavid Howells return NULL; 530cb0fc0c9SDavid Howells trace_rxrpc_call(call->debug_id, r + 1, 0, why); 5315e6ef4f1SDavid Howells return call; 5324a7f62f9SDavid Howells } 5334a7f62f9SDavid Howells 534e34d4234SDavid Howells /* 535e34d4234SDavid Howells * Note the addition of a ref on a call. 536e34d4234SDavid Howells */ 537cb0fc0c9SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 538e34d4234SDavid Howells { 539cb0fc0c9SDavid Howells int r; 540e34d4234SDavid Howells 541cb0fc0c9SDavid Howells __refcount_inc(&call->ref, &r); 542cb0fc0c9SDavid Howells trace_rxrpc_call(call->debug_id, r + 1, 0, why); 543e34d4234SDavid Howells } 544e34d4234SDavid Howells 545e34d4234SDavid Howells /* 546a4ea4c47SDavid Howells * Clean up the Rx skb ring. 547a641fd00SDavid Howells */ 548a641fd00SDavid Howells static void rxrpc_cleanup_ring(struct rxrpc_call *call) 549a641fd00SDavid Howells { 5505d7edbc9SDavid Howells skb_queue_purge(&call->recvmsg_queue); 5515d7edbc9SDavid Howells skb_queue_purge(&call->rx_oos_queue); 552a641fd00SDavid Howells } 553a641fd00SDavid Howells 554a641fd00SDavid Howells /* 555248f219cSDavid Howells * Detach a call from its owning socket. 5568c3e34a4SDavid Howells */ 5578d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 5588c3e34a4SDavid Howells { 559248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 5609d35d880SDavid Howells bool put = false, putu = false; 561248f219cSDavid Howells 562a0575429SDavid Howells _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); 563248f219cSDavid Howells 564cb0fc0c9SDavid Howells trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 565cb0fc0c9SDavid Howells call->flags, rxrpc_call_see_release); 5668c3e34a4SDavid Howells 5678c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 5688c3e34a4SDavid Howells BUG(); 5698c3e34a4SDavid Howells 570b7a7d674SDavid Howells rxrpc_put_call_slot(call); 5718c3e34a4SDavid Howells 572248f219cSDavid Howells /* Make sure we don't get any more notifications */ 573223f5901SDavid Howells spin_lock(&rx->recvmsg_lock); 574e653cfe4SDavid Howells 575248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 5768c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 5778c3e34a4SDavid Howells call, call->events, call->flags); 578248f219cSDavid Howells list_del(&call->recvmsg_link); 579248f219cSDavid Howells put = true; 580248f219cSDavid Howells } 581248f219cSDavid Howells 582248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 583248f219cSDavid Howells call->recvmsg_link.next = NULL; 584248f219cSDavid Howells call->recvmsg_link.prev = NULL; 585248f219cSDavid Howells 586223f5901SDavid Howells spin_unlock(&rx->recvmsg_lock); 587248f219cSDavid Howells if (put) 588cb0fc0c9SDavid Howells rxrpc_put_call(call, rxrpc_call_put_unnotify); 589248f219cSDavid Howells 590248f219cSDavid Howells write_lock(&rx->call_lock); 591248f219cSDavid Howells 592248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 5938c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 5948c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 5959d35d880SDavid Howells putu = true; 5968c3e34a4SDavid Howells } 5978c3e34a4SDavid Howells 598248f219cSDavid Howells list_del(&call->sock_link); 599248f219cSDavid Howells write_unlock(&rx->call_lock); 6008c3e34a4SDavid Howells 601248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 6028c3e34a4SDavid Howells 6039d35d880SDavid Howells if (putu) 6049d35d880SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 6059d35d880SDavid Howells 6068c3e34a4SDavid Howells _leave(""); 6078c3e34a4SDavid Howells } 6088c3e34a4SDavid Howells 6098c3e34a4SDavid Howells /* 6108c3e34a4SDavid Howells * release all the calls associated with a socket 6118c3e34a4SDavid Howells */ 6128c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 6138c3e34a4SDavid Howells { 6148c3e34a4SDavid Howells struct rxrpc_call *call; 6158c3e34a4SDavid Howells 6168c3e34a4SDavid Howells _enter("%p", rx); 6178c3e34a4SDavid Howells 6180360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 6190360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 6200360da6dSDavid Howells struct rxrpc_call, accept_link); 6210360da6dSDavid Howells list_del(&call->accept_link); 62257af281eSDavid Howells rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, 62357af281eSDavid Howells rxrpc_abort_call_sock_release_tba); 624cb0fc0c9SDavid Howells rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); 6250360da6dSDavid Howells } 6260360da6dSDavid Howells 627248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 628248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 629248f219cSDavid Howells struct rxrpc_call, sock_link); 630cb0fc0c9SDavid Howells rxrpc_get_call(call, rxrpc_call_get_release_sock); 63157af281eSDavid Howells rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, 63257af281eSDavid Howells rxrpc_abort_call_sock_release); 6338d94aa38SDavid Howells rxrpc_release_call(rx, call); 634cb0fc0c9SDavid Howells rxrpc_put_call(call, rxrpc_call_put_release_sock); 6358c3e34a4SDavid Howells } 6368c3e34a4SDavid Howells 6378c3e34a4SDavid Howells _leave(""); 6388c3e34a4SDavid Howells } 6398c3e34a4SDavid Howells 6408c3e34a4SDavid Howells /* 6418c3e34a4SDavid Howells * release a call 6428c3e34a4SDavid Howells */ 643cb0fc0c9SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 6448c3e34a4SDavid Howells { 645d3be4d24SDavid Howells struct rxrpc_net *rxnet = call->rxnet; 64648c9e0ecSDavid Howells unsigned int debug_id = call->debug_id; 647a0575429SDavid Howells bool dead; 648cb0fc0c9SDavid Howells int r; 649e34d4234SDavid Howells 6508c3e34a4SDavid Howells ASSERT(call != NULL); 6518c3e34a4SDavid Howells 652cb0fc0c9SDavid Howells dead = __refcount_dec_and_test(&call->ref, &r); 653cb0fc0c9SDavid Howells trace_rxrpc_call(debug_id, r - 1, 0, why); 654a0575429SDavid Howells if (dead) { 65596b4059fSDavid Howells ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); 656e34d4234SDavid Howells 6572baec2c3SDavid Howells if (!list_empty(&call->link)) { 6583dd9c8b5SDavid Howells spin_lock(&rxnet->call_lock); 659248f219cSDavid Howells list_del_init(&call->link); 6603dd9c8b5SDavid Howells spin_unlock(&rxnet->call_lock); 6612baec2c3SDavid Howells } 662e34d4234SDavid Howells 6638d94aa38SDavid Howells rxrpc_cleanup_call(call); 664e34d4234SDavid Howells } 6658c3e34a4SDavid Howells } 6668c3e34a4SDavid Howells 6678c3e34a4SDavid Howells /* 6683feda9d6SDavid Howells * Free up the call under RCU. 669dee46364SDavid Howells */ 6703feda9d6SDavid Howells static void rxrpc_rcu_free_call(struct rcu_head *rcu) 671dee46364SDavid Howells { 6723feda9d6SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 6733feda9d6SDavid Howells struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); 674dee46364SDavid Howells 675dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 676d3be4d24SDavid Howells if (atomic_dec_and_test(&rxnet->nr_calls)) 6775bb053beSLinus Torvalds wake_up_var(&rxnet->nr_calls); 678dee46364SDavid Howells } 679dee46364SDavid Howells 680dee46364SDavid Howells /* 6813feda9d6SDavid Howells * Final call destruction - but must be done in process context. 682963485d4SDavid Howells */ 6833feda9d6SDavid Howells static void rxrpc_destroy_call(struct work_struct *work) 684963485d4SDavid Howells { 6853feda9d6SDavid Howells struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); 686a4ea4c47SDavid Howells struct rxrpc_txbuf *txb; 687a4ea4c47SDavid Howells 6883feda9d6SDavid Howells del_timer_sync(&call->timer); 6898c3e34a4SDavid Howells 690a641fd00SDavid Howells rxrpc_cleanup_ring(call); 691cf37b598SDavid Howells while ((txb = list_first_entry_or_null(&call->tx_sendmsg, 692cf37b598SDavid Howells struct rxrpc_txbuf, call_link))) { 693cf37b598SDavid Howells list_del(&txb->call_link); 694cf37b598SDavid Howells rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 695cf37b598SDavid Howells } 696a4ea4c47SDavid Howells while ((txb = list_first_entry_or_null(&call->tx_buffer, 697a4ea4c47SDavid Howells struct rxrpc_txbuf, call_link))) { 698a4ea4c47SDavid Howells list_del(&txb->call_link); 699a4ea4c47SDavid Howells rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 700a4ea4c47SDavid Howells } 7015e6ef4f1SDavid Howells 702a4ea4c47SDavid Howells rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); 7033feda9d6SDavid Howells rxrpc_put_connection(call->conn, rxrpc_conn_put_call); 7041bab27afSDavid Howells rxrpc_deactivate_bundle(call->bundle); 7051bab27afSDavid Howells rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call); 7063feda9d6SDavid Howells rxrpc_put_peer(call->peer, rxrpc_peer_put_call); 707f3441d41SDavid Howells rxrpc_put_local(call->local, rxrpc_local_put_call); 7083feda9d6SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_free_call); 7093feda9d6SDavid Howells } 7108c3e34a4SDavid Howells 7113feda9d6SDavid Howells /* 7123feda9d6SDavid Howells * clean up a call 7133feda9d6SDavid Howells */ 7143feda9d6SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 7153feda9d6SDavid Howells { 7163feda9d6SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 7173feda9d6SDavid Howells 71896b4059fSDavid Howells ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); 7193feda9d6SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 7203feda9d6SDavid Howells 7215e6ef4f1SDavid Howells del_timer(&call->timer); 7223feda9d6SDavid Howells 7235e6ef4f1SDavid Howells if (rcu_read_lock_held()) 7243feda9d6SDavid Howells /* Can't use the rxrpc workqueue as we need to cancel/flush 7253feda9d6SDavid Howells * something that may be running/waiting there. 7263feda9d6SDavid Howells */ 7273feda9d6SDavid Howells schedule_work(&call->destroyer); 7283feda9d6SDavid Howells else 7293feda9d6SDavid Howells rxrpc_destroy_call(&call->destroyer); 7308c3e34a4SDavid Howells } 7318c3e34a4SDavid Howells 7328c3e34a4SDavid Howells /* 7332baec2c3SDavid Howells * Make sure that all calls are gone from a network namespace. To reach this 7342baec2c3SDavid Howells * point, any open UDP sockets in that namespace must have been closed, so any 7352baec2c3SDavid Howells * outstanding calls cannot be doing I/O. 7368c3e34a4SDavid Howells */ 7372baec2c3SDavid Howells void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 7388c3e34a4SDavid Howells { 7398c3e34a4SDavid Howells struct rxrpc_call *call; 7408c3e34a4SDavid Howells 7418c3e34a4SDavid Howells _enter(""); 7428d94aa38SDavid Howells 743b1302342SDavid Howells if (!list_empty(&rxnet->calls)) { 7443dd9c8b5SDavid Howells spin_lock(&rxnet->call_lock); 7458c3e34a4SDavid Howells 7462baec2c3SDavid Howells while (!list_empty(&rxnet->calls)) { 747b1302342SDavid Howells call = list_entry(rxnet->calls.next, 748b1302342SDavid Howells struct rxrpc_call, link); 7498c3e34a4SDavid Howells _debug("Zapping call %p", call); 7508c3e34a4SDavid Howells 751cb0fc0c9SDavid Howells rxrpc_see_call(call, rxrpc_call_see_zap); 7528c3e34a4SDavid Howells list_del_init(&call->link); 7538c3e34a4SDavid Howells 754248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 755a0575429SDavid Howells call, refcount_read(&call->ref), 75696b4059fSDavid Howells rxrpc_call_states[__rxrpc_call_state(call)], 7578c3e34a4SDavid Howells call->flags, call->events); 7588c3e34a4SDavid Howells 7593dd9c8b5SDavid Howells spin_unlock(&rxnet->call_lock); 7608c3e34a4SDavid Howells cond_resched(); 7613dd9c8b5SDavid Howells spin_lock(&rxnet->call_lock); 7628c3e34a4SDavid Howells } 7638c3e34a4SDavid Howells 7643dd9c8b5SDavid Howells spin_unlock(&rxnet->call_lock); 765b1302342SDavid Howells } 766d3be4d24SDavid Howells 767d3be4d24SDavid Howells atomic_dec(&rxnet->nr_calls); 7685bb053beSLinus Torvalds wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 7698c3e34a4SDavid Howells } 770