18c3e34a4SDavid Howells /* RxRPC individual remote procedure call handling 28c3e34a4SDavid Howells * 38c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 48c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 58c3e34a4SDavid Howells * 68c3e34a4SDavid Howells * This program is free software; you can redistribute it and/or 78c3e34a4SDavid Howells * modify it under the terms of the GNU General Public License 88c3e34a4SDavid Howells * as published by the Free Software Foundation; either version 98c3e34a4SDavid Howells * 2 of the License, or (at your option) any later version. 108c3e34a4SDavid Howells */ 118c3e34a4SDavid Howells 128c3e34a4SDavid Howells #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 138c3e34a4SDavid Howells 148c3e34a4SDavid Howells #include <linux/slab.h> 158c3e34a4SDavid Howells #include <linux/module.h> 168c3e34a4SDavid Howells #include <linux/circ_buf.h> 178c3e34a4SDavid Howells #include <linux/spinlock_types.h> 188c3e34a4SDavid Howells #include <net/sock.h> 198c3e34a4SDavid Howells #include <net/af_rxrpc.h> 208c3e34a4SDavid Howells #include "ar-internal.h" 218c3e34a4SDavid Howells 228c3e34a4SDavid Howells const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { 23999b69f8SDavid Howells [RXRPC_CALL_UNINITIALISED] = "Uninit ", 24999b69f8SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", 258c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", 268c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", 278c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", 2800e90712SDavid Howells [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", 298c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SECURING] = "SvSecure", 308c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", 318c3e34a4SDavid Howells [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 328c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 338c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 348c3e34a4SDavid Howells [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 358c3e34a4SDavid Howells [RXRPC_CALL_COMPLETE] = "Complete", 36f5c17aaeSDavid Howells }; 37f5c17aaeSDavid Howells 38f5c17aaeSDavid Howells const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 39f5c17aaeSDavid Howells [RXRPC_CALL_SUCCEEDED] = "Complete", 408c3e34a4SDavid Howells [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 418c3e34a4SDavid Howells [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 42f5c17aaeSDavid Howells [RXRPC_CALL_LOCAL_ERROR] = "LocError", 438c3e34a4SDavid Howells [RXRPC_CALL_NETWORK_ERROR] = "NetError", 448c3e34a4SDavid Howells }; 458c3e34a4SDavid Howells 468c3e34a4SDavid Howells struct kmem_cache *rxrpc_call_jar; 478c3e34a4SDavid Howells LIST_HEAD(rxrpc_calls); 488c3e34a4SDavid Howells DEFINE_RWLOCK(rxrpc_call_lock); 498c3e34a4SDavid Howells 50248f219cSDavid Howells static void rxrpc_call_timer_expired(unsigned long _call) 51248f219cSDavid Howells { 52248f219cSDavid Howells struct rxrpc_call *call = (struct rxrpc_call *)_call; 53248f219cSDavid Howells 54248f219cSDavid Howells _enter("%d", call->debug_id); 55248f219cSDavid Howells 56405dea1dSDavid Howells if (call->state < RXRPC_CALL_COMPLETE) 57405dea1dSDavid Howells rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real()); 58fc7ab6d2SDavid Howells } 598c3e34a4SDavid Howells 608c3e34a4SDavid Howells /* 618c3e34a4SDavid Howells * find an extant server call 628c3e34a4SDavid Howells * - called in process context with IRQs enabled 638c3e34a4SDavid Howells */ 648c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 658c3e34a4SDavid Howells unsigned long user_call_ID) 668c3e34a4SDavid Howells { 678c3e34a4SDavid Howells struct rxrpc_call *call; 688c3e34a4SDavid Howells struct rb_node *p; 698c3e34a4SDavid Howells 708c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 718c3e34a4SDavid Howells 728c3e34a4SDavid Howells read_lock(&rx->call_lock); 738c3e34a4SDavid Howells 748c3e34a4SDavid Howells p = rx->calls.rb_node; 758c3e34a4SDavid Howells while (p) { 768c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 778c3e34a4SDavid Howells 788c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 798c3e34a4SDavid Howells p = p->rb_left; 808c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 818c3e34a4SDavid Howells p = p->rb_right; 828c3e34a4SDavid Howells else 838c3e34a4SDavid Howells goto found_extant_call; 848c3e34a4SDavid Howells } 858c3e34a4SDavid Howells 868c3e34a4SDavid Howells read_unlock(&rx->call_lock); 878c3e34a4SDavid Howells _leave(" = NULL"); 888c3e34a4SDavid Howells return NULL; 898c3e34a4SDavid Howells 908c3e34a4SDavid Howells found_extant_call: 91fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got); 928c3e34a4SDavid Howells read_unlock(&rx->call_lock); 938c3e34a4SDavid Howells _leave(" = %p [%d]", call, atomic_read(&call->usage)); 948c3e34a4SDavid Howells return call; 958c3e34a4SDavid Howells } 968c3e34a4SDavid Howells 978c3e34a4SDavid Howells /* 988c3e34a4SDavid Howells * allocate a new call 998c3e34a4SDavid Howells */ 10000e90712SDavid Howells struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) 1018c3e34a4SDavid Howells { 1028c3e34a4SDavid Howells struct rxrpc_call *call; 1038c3e34a4SDavid Howells 1048c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1058c3e34a4SDavid Howells if (!call) 1068c3e34a4SDavid Howells return NULL; 1078c3e34a4SDavid Howells 108248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 109248f219cSDavid Howells sizeof(struct sk_buff *), 1108c3e34a4SDavid Howells gfp); 111248f219cSDavid Howells if (!call->rxtx_buffer) 112248f219cSDavid Howells goto nomem; 1138c3e34a4SDavid Howells 114248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 115248f219cSDavid Howells if (!call->rxtx_annotations) 116248f219cSDavid Howells goto nomem_2; 117248f219cSDavid Howells 118540b1c48SDavid Howells mutex_init(&call->user_mutex); 119248f219cSDavid Howells setup_timer(&call->timer, rxrpc_call_timer_expired, 1208c3e34a4SDavid Howells (unsigned long)call); 1218c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 122999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 12345025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1248c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 125248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 126248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 12745025bceSDavid Howells init_waitqueue_head(&call->waitq); 1288c3e34a4SDavid Howells spin_lock_init(&call->lock); 1298c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1308c3e34a4SDavid Howells atomic_set(&call->usage, 1); 1318c3e34a4SDavid Howells call->debug_id = atomic_inc_return(&rxrpc_debug_id); 1328c3e34a4SDavid Howells 1338c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1348c3e34a4SDavid Howells 135248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 13675e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 137248f219cSDavid Howells call->tx_winsize = 16; 138248f219cSDavid Howells call->rx_expect_next = 1; 13957494343SDavid Howells 14057494343SDavid Howells if (RXRPC_TX_SMSS > 2190) 14157494343SDavid Howells call->cong_cwnd = 2; 14257494343SDavid Howells else if (RXRPC_TX_SMSS > 1095) 14357494343SDavid Howells call->cong_cwnd = 3; 14457494343SDavid Howells else 14557494343SDavid Howells call->cong_cwnd = 4; 14657494343SDavid Howells call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 1478c3e34a4SDavid Howells return call; 148248f219cSDavid Howells 149248f219cSDavid Howells nomem_2: 150248f219cSDavid Howells kfree(call->rxtx_buffer); 151248f219cSDavid Howells nomem: 152248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 153248f219cSDavid Howells return NULL; 1548c3e34a4SDavid Howells } 1558c3e34a4SDavid Howells 1568c3e34a4SDavid Howells /* 157999b69f8SDavid Howells * Allocate a new client call. 1588c3e34a4SDavid Howells */ 159248f219cSDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx, 1608c3e34a4SDavid Howells gfp_t gfp) 1618c3e34a4SDavid Howells { 1628c3e34a4SDavid Howells struct rxrpc_call *call; 16357494343SDavid Howells ktime_t now; 1648c3e34a4SDavid Howells 1658c3e34a4SDavid Howells _enter(""); 1668c3e34a4SDavid Howells 1678c3e34a4SDavid Howells call = rxrpc_alloc_call(gfp); 1688c3e34a4SDavid Howells if (!call) 1698c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 170999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 171999b69f8SDavid Howells call->service_id = srx->srx_service; 17271f3ca40SDavid Howells call->tx_phase = true; 17357494343SDavid Howells now = ktime_get_real(); 17457494343SDavid Howells call->acks_latest_ts = now; 17557494343SDavid Howells call->cong_tstamp = now; 176999b69f8SDavid Howells 177999b69f8SDavid Howells _leave(" = %p", call); 178999b69f8SDavid Howells return call; 179999b69f8SDavid Howells } 180999b69f8SDavid Howells 181999b69f8SDavid Howells /* 182248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 183999b69f8SDavid Howells */ 184248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 185999b69f8SDavid Howells { 186df0adc78SDavid Howells ktime_t now = ktime_get_real(), expire_at; 187999b69f8SDavid Howells 188df0adc78SDavid Howells expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime); 189248f219cSDavid Howells call->expire_at = expire_at; 190248f219cSDavid Howells call->ack_at = expire_at; 191a5af7e1fSDavid Howells call->ping_at = expire_at; 192248f219cSDavid Howells call->resend_at = expire_at; 193df0adc78SDavid Howells call->timer.expires = jiffies + LONG_MAX / 2; 194df0adc78SDavid Howells rxrpc_set_timer(call, rxrpc_timer_begin, now); 1958c3e34a4SDavid Howells } 1968c3e34a4SDavid Howells 1978c3e34a4SDavid Howells /* 198540b1c48SDavid Howells * Set up a call for the given parameters. 199540b1c48SDavid Howells * - Called with the socket lock held, which it must release. 200540b1c48SDavid Howells * - If it returns a call, the call's lock will need releasing by the caller. 2018c3e34a4SDavid Howells */ 2028c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 20319ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 204999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 2058c3e34a4SDavid Howells unsigned long user_call_ID, 2068c3e34a4SDavid Howells gfp_t gfp) 207540b1c48SDavid Howells __releases(&rx->sk.sk_lock.slock) 2088c3e34a4SDavid Howells { 2098c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 2108c3e34a4SDavid Howells struct rb_node *parent, **pp; 211e34d4234SDavid Howells const void *here = __builtin_return_address(0); 212999b69f8SDavid Howells int ret; 2138c3e34a4SDavid Howells 214999b69f8SDavid Howells _enter("%p,%lx", rx, user_call_ID); 2158c3e34a4SDavid Howells 216248f219cSDavid Howells call = rxrpc_alloc_client_call(srx, gfp); 2178c3e34a4SDavid Howells if (IS_ERR(call)) { 218540b1c48SDavid Howells release_sock(&rx->sk); 2198c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2208c3e34a4SDavid Howells return call; 2218c3e34a4SDavid Howells } 2228c3e34a4SDavid Howells 223a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 224a84a46d7SDavid Howells here, (const void *)user_call_ID); 225e34d4234SDavid Howells 226540b1c48SDavid Howells /* We need to protect a partially set up call against the user as we 227540b1c48SDavid Howells * will be acting outside the socket lock. 228540b1c48SDavid Howells */ 229540b1c48SDavid Howells mutex_lock(&call->user_mutex); 230540b1c48SDavid Howells 231999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2328c3e34a4SDavid Howells write_lock(&rx->call_lock); 2338c3e34a4SDavid Howells 2348c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2358c3e34a4SDavid Howells parent = NULL; 2368c3e34a4SDavid Howells while (*pp) { 2378c3e34a4SDavid Howells parent = *pp; 2388c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2398c3e34a4SDavid Howells 2408c3e34a4SDavid Howells if (user_call_ID < xcall->user_call_ID) 2418c3e34a4SDavid Howells pp = &(*pp)->rb_left; 2428c3e34a4SDavid Howells else if (user_call_ID > xcall->user_call_ID) 2438c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2448c3e34a4SDavid Howells else 245357f5ef6SDavid Howells goto error_dup_user_ID; 2468c3e34a4SDavid Howells } 2478c3e34a4SDavid Howells 248248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 249357f5ef6SDavid Howells call->user_call_ID = user_call_ID; 250357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 251fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2528c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2538c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 254248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 255248f219cSDavid Howells 2568c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2578c3e34a4SDavid Howells 258248f219cSDavid Howells write_lock(&rxrpc_call_lock); 2598c3e34a4SDavid Howells list_add_tail(&call->link, &rxrpc_calls); 260248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 2618c3e34a4SDavid Howells 262540b1c48SDavid Howells /* From this point on, the call is protected by its own lock. */ 263540b1c48SDavid Howells release_sock(&rx->sk); 264540b1c48SDavid Howells 265248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 266248f219cSDavid Howells * including channel number and call ID. 267248f219cSDavid Howells */ 268248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 269999b69f8SDavid Howells if (ret < 0) 270999b69f8SDavid Howells goto error; 271999b69f8SDavid Howells 272a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 27354fde423SDavid Howells here, NULL); 274a84a46d7SDavid Howells 275248f219cSDavid Howells spin_lock_bh(&call->conn->params.peer->lock); 276248f219cSDavid Howells hlist_add_head(&call->error_link, 277248f219cSDavid Howells &call->conn->params.peer->error_targets); 278248f219cSDavid Howells spin_unlock_bh(&call->conn->params.peer->lock); 279248f219cSDavid Howells 280248f219cSDavid Howells rxrpc_start_call_timer(call); 281248f219cSDavid Howells 2828c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2838c3e34a4SDavid Howells 2848c3e34a4SDavid Howells _leave(" = %p [new]", call); 2858c3e34a4SDavid Howells return call; 2868c3e34a4SDavid Howells 2878c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 2888c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 2898c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 2908c3e34a4SDavid Howells * same time in different threads. 2918c3e34a4SDavid Howells */ 292357f5ef6SDavid Howells error_dup_user_ID: 2938c3e34a4SDavid Howells write_unlock(&rx->call_lock); 294540b1c48SDavid Howells release_sock(&rx->sk); 2958d94aa38SDavid Howells ret = -EEXIST; 296357f5ef6SDavid Howells 297357f5ef6SDavid Howells error: 298357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 299357f5ef6SDavid Howells RX_CALL_DEAD, ret); 300a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 301a84a46d7SDavid Howells here, ERR_PTR(ret)); 302357f5ef6SDavid Howells rxrpc_release_call(rx, call); 303540b1c48SDavid Howells mutex_unlock(&call->user_mutex); 304357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 305357f5ef6SDavid Howells _leave(" = %d", ret); 306357f5ef6SDavid Howells return ERR_PTR(ret); 3078c3e34a4SDavid Howells } 3088c3e34a4SDavid Howells 3098c3e34a4SDavid Howells /* 310248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 311248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3128c3e34a4SDavid Howells */ 313248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 314248f219cSDavid Howells struct rxrpc_call *call, 31542886ffeSDavid Howells struct sk_buff *skb) 3168c3e34a4SDavid Howells { 317248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 31842886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 319248f219cSDavid Howells u32 chan; 3208c3e34a4SDavid Howells 321248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3228c3e34a4SDavid Howells 323248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 324248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 325248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 326248f219cSDavid Howells call->cid = sp->hdr.cid; 327248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 328248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 329248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 33057494343SDavid Howells call->cong_tstamp = skb->tstamp; 3318c3e34a4SDavid Howells 332248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 333248f219cSDavid Howells * only defending against the data_ready handler (which we're called 334248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 335248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 336248f219cSDavid Howells * call pointer). 3378c3e34a4SDavid Howells */ 338248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 339248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 340248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 341a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3428c3e34a4SDavid Howells 34385f32278SDavid Howells spin_lock(&conn->params.peer->lock); 34485f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 34585f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3468c3e34a4SDavid Howells 3478c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3488c3e34a4SDavid Howells 349248f219cSDavid Howells rxrpc_start_call_timer(call); 350248f219cSDavid Howells _leave(""); 3518c3e34a4SDavid Howells } 3528c3e34a4SDavid Howells 3538c3e34a4SDavid Howells /* 3548d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 3558d94aa38SDavid Howells */ 3568d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 3578d94aa38SDavid Howells { 3588d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3598d94aa38SDavid Howells int n = __atomic_add_unless(&call->usage, 1, 0); 3608d94aa38SDavid Howells if (n == 0) 3618d94aa38SDavid Howells return false; 3628d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3632ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 3648d94aa38SDavid Howells else 3658d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3668d94aa38SDavid Howells return true; 3678d94aa38SDavid Howells } 3688d94aa38SDavid Howells 3698d94aa38SDavid Howells /* 3708d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 3718d94aa38SDavid Howells */ 3728d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 3738d94aa38SDavid Howells { 3748d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3758d94aa38SDavid Howells int n = atomic_read(&call->usage); 3768d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 3778d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3782ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 3798d94aa38SDavid Howells else 3808d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3818d94aa38SDavid Howells return true; 3828d94aa38SDavid Howells } 3838d94aa38SDavid Howells 3848d94aa38SDavid Howells /* 385e34d4234SDavid Howells * Note the re-emergence of a call. 386e34d4234SDavid Howells */ 387e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 388e34d4234SDavid Howells { 389e34d4234SDavid Howells const void *here = __builtin_return_address(0); 390e34d4234SDavid Howells if (call) { 391e34d4234SDavid Howells int n = atomic_read(&call->usage); 392e34d4234SDavid Howells 3932ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 394e34d4234SDavid Howells } 395e34d4234SDavid Howells } 396e34d4234SDavid Howells 397e34d4234SDavid Howells /* 398e34d4234SDavid Howells * Note the addition of a ref on a call. 399e34d4234SDavid Howells */ 400fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 401e34d4234SDavid Howells { 402e34d4234SDavid Howells const void *here = __builtin_return_address(0); 403e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 404e34d4234SDavid Howells 4052ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 406e34d4234SDavid Howells } 407e34d4234SDavid Howells 408e34d4234SDavid Howells /* 409248f219cSDavid Howells * Detach a call from its owning socket. 4108c3e34a4SDavid Howells */ 4118d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4128c3e34a4SDavid Howells { 413a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 414248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 415248f219cSDavid Howells bool put = false; 416248f219cSDavid Howells int i; 417248f219cSDavid Howells 418248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 419248f219cSDavid Howells 420a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 421a84a46d7SDavid Howells here, (const void *)call->flags); 4228c3e34a4SDavid Howells 423a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 424e34d4234SDavid Howells 4258c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4268c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4278c3e34a4SDavid Howells BUG(); 4288c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4298c3e34a4SDavid Howells 430248f219cSDavid Howells del_timer_sync(&call->timer); 4318c3e34a4SDavid Howells 432248f219cSDavid Howells /* Make sure we don't get any more notifications */ 433248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 434e653cfe4SDavid Howells 435248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4368c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4378c3e34a4SDavid Howells call, call->events, call->flags); 438248f219cSDavid Howells list_del(&call->recvmsg_link); 439248f219cSDavid Howells put = true; 440248f219cSDavid Howells } 441248f219cSDavid Howells 442248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 443248f219cSDavid Howells call->recvmsg_link.next = NULL; 444248f219cSDavid Howells call->recvmsg_link.prev = NULL; 445248f219cSDavid Howells 446248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 447248f219cSDavid Howells if (put) 448248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 449248f219cSDavid Howells 450248f219cSDavid Howells write_lock(&rx->call_lock); 451248f219cSDavid Howells 452248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 4538c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 4548c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 4558d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 4568c3e34a4SDavid Howells } 4578c3e34a4SDavid Howells 458248f219cSDavid Howells list_del(&call->sock_link); 459248f219cSDavid Howells write_unlock(&rx->call_lock); 4608c3e34a4SDavid Howells 461248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 4628c3e34a4SDavid Howells 463248f219cSDavid Howells if (conn) 464e653cfe4SDavid Howells rxrpc_disconnect_call(call); 465e653cfe4SDavid Howells 466248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 46771f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 46871f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 46971f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 470248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 4718c3e34a4SDavid Howells } 4728c3e34a4SDavid Howells 4738c3e34a4SDavid Howells _leave(""); 4748c3e34a4SDavid Howells } 4758c3e34a4SDavid Howells 4768c3e34a4SDavid Howells /* 4778c3e34a4SDavid Howells * release all the calls associated with a socket 4788c3e34a4SDavid Howells */ 4798c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 4808c3e34a4SDavid Howells { 4818c3e34a4SDavid Howells struct rxrpc_call *call; 4828c3e34a4SDavid Howells 4838c3e34a4SDavid Howells _enter("%p", rx); 4848c3e34a4SDavid Howells 4850360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 4860360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 4870360da6dSDavid Howells struct rxrpc_call, accept_link); 4880360da6dSDavid Howells list_del(&call->accept_link); 4890360da6dSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET); 4900360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 4910360da6dSDavid Howells } 4920360da6dSDavid Howells 493248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 494248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 495248f219cSDavid Howells struct rxrpc_call, sock_link); 496248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 497248f219cSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET); 49826cb02aaSDavid Howells rxrpc_send_abort_packet(call); 4998d94aa38SDavid Howells rxrpc_release_call(rx, call); 500248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5018c3e34a4SDavid Howells } 5028c3e34a4SDavid Howells 5038c3e34a4SDavid Howells _leave(""); 5048c3e34a4SDavid Howells } 5058c3e34a4SDavid Howells 5068c3e34a4SDavid Howells /* 5078c3e34a4SDavid Howells * release a call 5088c3e34a4SDavid Howells */ 509fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 5108c3e34a4SDavid Howells { 511e34d4234SDavid Howells const void *here = __builtin_return_address(0); 5122ab27215SDavid Howells int n; 513e34d4234SDavid Howells 5148c3e34a4SDavid Howells ASSERT(call != NULL); 5158c3e34a4SDavid Howells 516e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 5172ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 518e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 519e34d4234SDavid Howells if (n == 0) { 5208c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 521248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 522e34d4234SDavid Howells 523248f219cSDavid Howells write_lock(&rxrpc_call_lock); 524248f219cSDavid Howells list_del_init(&call->link); 525248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 526e34d4234SDavid Howells 5278d94aa38SDavid Howells rxrpc_cleanup_call(call); 528e34d4234SDavid Howells } 5298c3e34a4SDavid Howells } 5308c3e34a4SDavid Howells 5318c3e34a4SDavid Howells /* 532dee46364SDavid Howells * Final call destruction under RCU. 533dee46364SDavid Howells */ 534dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 535dee46364SDavid Howells { 536dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 537dee46364SDavid Howells 538df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 539248f219cSDavid Howells kfree(call->rxtx_buffer); 540248f219cSDavid Howells kfree(call->rxtx_annotations); 541dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 542dee46364SDavid Howells } 543dee46364SDavid Howells 544dee46364SDavid Howells /* 5458c3e34a4SDavid Howells * clean up a call 5468c3e34a4SDavid Howells */ 54700e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 5488c3e34a4SDavid Howells { 549248f219cSDavid Howells int i; 5508c3e34a4SDavid Howells 551248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 5528c3e34a4SDavid Howells 5538c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 5548c3e34a4SDavid Howells 555248f219cSDavid Howells del_timer_sync(&call->timer); 5568c3e34a4SDavid Howells 5578d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 5588c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 559e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 5608c3e34a4SDavid Howells 561248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 562248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 56371f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 56471f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 56571f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 5668c3e34a4SDavid Howells 56771f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 5688c3e34a4SDavid Howells 569dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 5708c3e34a4SDavid Howells } 5718c3e34a4SDavid Howells 5728c3e34a4SDavid Howells /* 5738d94aa38SDavid Howells * Make sure that all calls are gone. 5748c3e34a4SDavid Howells */ 5758c3e34a4SDavid Howells void __exit rxrpc_destroy_all_calls(void) 5768c3e34a4SDavid Howells { 5778c3e34a4SDavid Howells struct rxrpc_call *call; 5788c3e34a4SDavid Howells 5798c3e34a4SDavid Howells _enter(""); 5808d94aa38SDavid Howells 5818d94aa38SDavid Howells if (list_empty(&rxrpc_calls)) 5828d94aa38SDavid Howells return; 5838d94aa38SDavid Howells 584248f219cSDavid Howells write_lock(&rxrpc_call_lock); 5858c3e34a4SDavid Howells 5868c3e34a4SDavid Howells while (!list_empty(&rxrpc_calls)) { 5878c3e34a4SDavid Howells call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); 5888c3e34a4SDavid Howells _debug("Zapping call %p", call); 5898c3e34a4SDavid Howells 590e34d4234SDavid Howells rxrpc_see_call(call); 5918c3e34a4SDavid Howells list_del_init(&call->link); 5928c3e34a4SDavid Howells 593248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 5948c3e34a4SDavid Howells call, atomic_read(&call->usage), 5958c3e34a4SDavid Howells rxrpc_call_states[call->state], 5968c3e34a4SDavid Howells call->flags, call->events); 5978c3e34a4SDavid Howells 598248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 5998c3e34a4SDavid Howells cond_resched(); 600248f219cSDavid Howells write_lock(&rxrpc_call_lock); 6018c3e34a4SDavid Howells } 6028c3e34a4SDavid Howells 603248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 6048c3e34a4SDavid Howells } 605