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 46fff72429SDavid Howells const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = { 47fff72429SDavid Howells [rxrpc_call_new_client] = "NWc", 48fff72429SDavid Howells [rxrpc_call_new_service] = "NWs", 49fff72429SDavid Howells [rxrpc_call_queued] = "QUE", 50fff72429SDavid Howells [rxrpc_call_queued_ref] = "QUR", 51a84a46d7SDavid Howells [rxrpc_call_connected] = "CON", 52a84a46d7SDavid Howells [rxrpc_call_release] = "RLS", 53fff72429SDavid Howells [rxrpc_call_seen] = "SEE", 54fff72429SDavid Howells [rxrpc_call_got] = "GOT", 55fff72429SDavid Howells [rxrpc_call_got_userid] = "Gus", 56cbd00891SDavid Howells [rxrpc_call_got_kernel] = "Gke", 57fff72429SDavid Howells [rxrpc_call_put] = "PUT", 58fff72429SDavid Howells [rxrpc_call_put_userid] = "Pus", 59cbd00891SDavid Howells [rxrpc_call_put_kernel] = "Pke", 60fff72429SDavid Howells [rxrpc_call_put_noqueue] = "PNQ", 61a84a46d7SDavid Howells [rxrpc_call_error] = "*E*", 62fff72429SDavid Howells }; 63fff72429SDavid Howells 648c3e34a4SDavid Howells struct kmem_cache *rxrpc_call_jar; 658c3e34a4SDavid Howells LIST_HEAD(rxrpc_calls); 668c3e34a4SDavid Howells DEFINE_RWLOCK(rxrpc_call_lock); 678c3e34a4SDavid Howells 68248f219cSDavid Howells static void rxrpc_call_timer_expired(unsigned long _call) 69248f219cSDavid Howells { 70248f219cSDavid Howells struct rxrpc_call *call = (struct rxrpc_call *)_call; 71248f219cSDavid Howells 72248f219cSDavid Howells _enter("%d", call->debug_id); 73248f219cSDavid Howells 74fc7ab6d2SDavid Howells if (call->state < RXRPC_CALL_COMPLETE) { 75df0adc78SDavid Howells trace_rxrpc_timer(call, rxrpc_timer_expired, 76df0adc78SDavid Howells ktime_get_real(), jiffies); 77248f219cSDavid Howells rxrpc_queue_call(call); 78248f219cSDavid Howells } 79fc7ab6d2SDavid Howells } 808c3e34a4SDavid Howells 818c3e34a4SDavid Howells /* 828c3e34a4SDavid Howells * find an extant server call 838c3e34a4SDavid Howells * - called in process context with IRQs enabled 848c3e34a4SDavid Howells */ 858c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 868c3e34a4SDavid Howells unsigned long user_call_ID) 878c3e34a4SDavid Howells { 888c3e34a4SDavid Howells struct rxrpc_call *call; 898c3e34a4SDavid Howells struct rb_node *p; 908c3e34a4SDavid Howells 918c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 928c3e34a4SDavid Howells 938c3e34a4SDavid Howells read_lock(&rx->call_lock); 948c3e34a4SDavid Howells 958c3e34a4SDavid Howells p = rx->calls.rb_node; 968c3e34a4SDavid Howells while (p) { 978c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 988c3e34a4SDavid Howells 998c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 1008c3e34a4SDavid Howells p = p->rb_left; 1018c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 1028c3e34a4SDavid Howells p = p->rb_right; 1038c3e34a4SDavid Howells else 1048c3e34a4SDavid Howells goto found_extant_call; 1058c3e34a4SDavid Howells } 1068c3e34a4SDavid Howells 1078c3e34a4SDavid Howells read_unlock(&rx->call_lock); 1088c3e34a4SDavid Howells _leave(" = NULL"); 1098c3e34a4SDavid Howells return NULL; 1108c3e34a4SDavid Howells 1118c3e34a4SDavid Howells found_extant_call: 112fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got); 1138c3e34a4SDavid Howells read_unlock(&rx->call_lock); 1148c3e34a4SDavid Howells _leave(" = %p [%d]", call, atomic_read(&call->usage)); 1158c3e34a4SDavid Howells return call; 1168c3e34a4SDavid Howells } 1178c3e34a4SDavid Howells 1188c3e34a4SDavid Howells /* 1198c3e34a4SDavid Howells * allocate a new call 1208c3e34a4SDavid Howells */ 12100e90712SDavid Howells struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) 1228c3e34a4SDavid Howells { 1238c3e34a4SDavid Howells struct rxrpc_call *call; 1248c3e34a4SDavid Howells 1258c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1268c3e34a4SDavid Howells if (!call) 1278c3e34a4SDavid Howells return NULL; 1288c3e34a4SDavid Howells 129248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 130248f219cSDavid Howells sizeof(struct sk_buff *), 1318c3e34a4SDavid Howells gfp); 132248f219cSDavid Howells if (!call->rxtx_buffer) 133248f219cSDavid Howells goto nomem; 1348c3e34a4SDavid Howells 135248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 136248f219cSDavid Howells if (!call->rxtx_annotations) 137248f219cSDavid Howells goto nomem_2; 138248f219cSDavid Howells 139248f219cSDavid Howells setup_timer(&call->timer, rxrpc_call_timer_expired, 1408c3e34a4SDavid Howells (unsigned long)call); 1418c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 142999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 14345025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1448c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 145248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 146248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 14745025bceSDavid Howells init_waitqueue_head(&call->waitq); 1488c3e34a4SDavid Howells spin_lock_init(&call->lock); 1498c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1508c3e34a4SDavid Howells atomic_set(&call->usage, 1); 1518c3e34a4SDavid Howells call->debug_id = atomic_inc_return(&rxrpc_debug_id); 1528c3e34a4SDavid Howells 1538c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1548c3e34a4SDavid Howells 155248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 15675e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 157248f219cSDavid Howells call->tx_winsize = 16; 158248f219cSDavid Howells call->rx_expect_next = 1; 15957494343SDavid Howells 16057494343SDavid Howells if (RXRPC_TX_SMSS > 2190) 16157494343SDavid Howells call->cong_cwnd = 2; 16257494343SDavid Howells else if (RXRPC_TX_SMSS > 1095) 16357494343SDavid Howells call->cong_cwnd = 3; 16457494343SDavid Howells else 16557494343SDavid Howells call->cong_cwnd = 4; 16657494343SDavid Howells call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 1678c3e34a4SDavid Howells return call; 168248f219cSDavid Howells 169248f219cSDavid Howells nomem_2: 170248f219cSDavid Howells kfree(call->rxtx_buffer); 171248f219cSDavid Howells nomem: 172248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 173248f219cSDavid Howells return NULL; 1748c3e34a4SDavid Howells } 1758c3e34a4SDavid Howells 1768c3e34a4SDavid Howells /* 177999b69f8SDavid Howells * Allocate a new client call. 1788c3e34a4SDavid Howells */ 179248f219cSDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx, 1808c3e34a4SDavid Howells gfp_t gfp) 1818c3e34a4SDavid Howells { 1828c3e34a4SDavid Howells struct rxrpc_call *call; 18357494343SDavid Howells ktime_t now; 1848c3e34a4SDavid Howells 1858c3e34a4SDavid Howells _enter(""); 1868c3e34a4SDavid Howells 1878c3e34a4SDavid Howells call = rxrpc_alloc_call(gfp); 1888c3e34a4SDavid Howells if (!call) 1898c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 190999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 191999b69f8SDavid Howells call->service_id = srx->srx_service; 19271f3ca40SDavid Howells call->tx_phase = true; 19357494343SDavid Howells now = ktime_get_real(); 19457494343SDavid Howells call->acks_latest_ts = now; 19557494343SDavid Howells call->cong_tstamp = now; 196999b69f8SDavid Howells 197999b69f8SDavid Howells _leave(" = %p", call); 198999b69f8SDavid Howells return call; 199999b69f8SDavid Howells } 200999b69f8SDavid Howells 201999b69f8SDavid Howells /* 202248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 203999b69f8SDavid Howells */ 204248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 205999b69f8SDavid Howells { 206df0adc78SDavid Howells ktime_t now = ktime_get_real(), expire_at; 207999b69f8SDavid Howells 208df0adc78SDavid Howells expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime); 209248f219cSDavid Howells call->expire_at = expire_at; 210248f219cSDavid Howells call->ack_at = expire_at; 211248f219cSDavid Howells call->resend_at = expire_at; 212df0adc78SDavid Howells call->timer.expires = jiffies + LONG_MAX / 2; 213df0adc78SDavid Howells rxrpc_set_timer(call, rxrpc_timer_begin, now); 2148c3e34a4SDavid Howells } 2158c3e34a4SDavid Howells 2168c3e34a4SDavid Howells /* 2178c3e34a4SDavid Howells * set up a call for the given data 2188c3e34a4SDavid Howells * - called in process context with IRQs enabled 2198c3e34a4SDavid Howells */ 2208c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 22119ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 222999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 2238c3e34a4SDavid Howells unsigned long user_call_ID, 2248c3e34a4SDavid Howells gfp_t gfp) 2258c3e34a4SDavid Howells { 2268c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 2278c3e34a4SDavid Howells struct rb_node *parent, **pp; 228e34d4234SDavid Howells const void *here = __builtin_return_address(0); 229999b69f8SDavid Howells int ret; 2308c3e34a4SDavid Howells 231999b69f8SDavid Howells _enter("%p,%lx", rx, user_call_ID); 2328c3e34a4SDavid Howells 233248f219cSDavid Howells call = rxrpc_alloc_client_call(srx, gfp); 2348c3e34a4SDavid Howells if (IS_ERR(call)) { 2358c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2368c3e34a4SDavid Howells return call; 2378c3e34a4SDavid Howells } 2388c3e34a4SDavid Howells 239a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 240a84a46d7SDavid Howells here, (const void *)user_call_ID); 241e34d4234SDavid Howells 242999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2438c3e34a4SDavid Howells write_lock(&rx->call_lock); 2448c3e34a4SDavid Howells 2458c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2468c3e34a4SDavid Howells parent = NULL; 2478c3e34a4SDavid Howells while (*pp) { 2488c3e34a4SDavid Howells parent = *pp; 2498c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2508c3e34a4SDavid Howells 2518c3e34a4SDavid Howells if (user_call_ID < xcall->user_call_ID) 2528c3e34a4SDavid Howells pp = &(*pp)->rb_left; 2538c3e34a4SDavid Howells else if (user_call_ID > xcall->user_call_ID) 2548c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2558c3e34a4SDavid Howells else 256357f5ef6SDavid Howells goto error_dup_user_ID; 2578c3e34a4SDavid Howells } 2588c3e34a4SDavid Howells 259248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 260357f5ef6SDavid Howells call->user_call_ID = user_call_ID; 261357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 262fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2638c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2648c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 265248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 266248f219cSDavid Howells 2678c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2688c3e34a4SDavid Howells 269248f219cSDavid Howells write_lock(&rxrpc_call_lock); 2708c3e34a4SDavid Howells list_add_tail(&call->link, &rxrpc_calls); 271248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 2728c3e34a4SDavid Howells 273248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 274248f219cSDavid Howells * including channel number and call ID. 275248f219cSDavid Howells */ 276248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 277999b69f8SDavid Howells if (ret < 0) 278999b69f8SDavid Howells goto error; 279999b69f8SDavid Howells 280a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 281a84a46d7SDavid Howells here, ERR_PTR(ret)); 282a84a46d7SDavid Howells 283248f219cSDavid Howells spin_lock_bh(&call->conn->params.peer->lock); 284248f219cSDavid Howells hlist_add_head(&call->error_link, 285248f219cSDavid Howells &call->conn->params.peer->error_targets); 286248f219cSDavid Howells spin_unlock_bh(&call->conn->params.peer->lock); 287248f219cSDavid Howells 288248f219cSDavid Howells rxrpc_start_call_timer(call); 289248f219cSDavid Howells 2908c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2918c3e34a4SDavid Howells 2928c3e34a4SDavid Howells _leave(" = %p [new]", call); 2938c3e34a4SDavid Howells return call; 2948c3e34a4SDavid Howells 2958c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 2968c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 2978c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 2988c3e34a4SDavid Howells * same time in different threads. 2998c3e34a4SDavid Howells */ 300357f5ef6SDavid Howells error_dup_user_ID: 3018c3e34a4SDavid Howells write_unlock(&rx->call_lock); 3028d94aa38SDavid Howells ret = -EEXIST; 303357f5ef6SDavid Howells 304357f5ef6SDavid Howells error: 305357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 306357f5ef6SDavid Howells RX_CALL_DEAD, ret); 307a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 308a84a46d7SDavid Howells here, ERR_PTR(ret)); 309357f5ef6SDavid Howells rxrpc_release_call(rx, call); 310357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 311357f5ef6SDavid Howells _leave(" = %d", ret); 312357f5ef6SDavid Howells return ERR_PTR(ret); 3138c3e34a4SDavid Howells } 3148c3e34a4SDavid Howells 3158c3e34a4SDavid Howells /* 316248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 317248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3188c3e34a4SDavid Howells */ 319248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 320248f219cSDavid Howells struct rxrpc_call *call, 32142886ffeSDavid Howells struct sk_buff *skb) 3228c3e34a4SDavid Howells { 323248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 32442886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 325248f219cSDavid Howells u32 chan; 3268c3e34a4SDavid Howells 327248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3288c3e34a4SDavid Howells 329248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 330248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 331248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 332248f219cSDavid Howells call->cid = sp->hdr.cid; 333248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 334248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 335248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 33657494343SDavid Howells call->cong_tstamp = skb->tstamp; 3378c3e34a4SDavid Howells 338248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 339248f219cSDavid Howells * only defending against the data_ready handler (which we're called 340248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 341248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 342248f219cSDavid Howells * call pointer). 3438c3e34a4SDavid Howells */ 344248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 345248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 346248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 347a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3488c3e34a4SDavid Howells 34985f32278SDavid Howells spin_lock(&conn->params.peer->lock); 35085f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 35185f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3528c3e34a4SDavid Howells 3538c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3548c3e34a4SDavid Howells 355248f219cSDavid Howells rxrpc_start_call_timer(call); 356248f219cSDavid Howells _leave(""); 3578c3e34a4SDavid Howells } 3588c3e34a4SDavid Howells 3598c3e34a4SDavid Howells /* 3608d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 3618d94aa38SDavid Howells */ 3628d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 3638d94aa38SDavid Howells { 3648d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3658d94aa38SDavid Howells int n = __atomic_add_unless(&call->usage, 1, 0); 3668d94aa38SDavid Howells if (n == 0) 3678d94aa38SDavid Howells return false; 3688d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3692ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 3708d94aa38SDavid Howells else 3718d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3728d94aa38SDavid Howells return true; 3738d94aa38SDavid Howells } 3748d94aa38SDavid Howells 3758d94aa38SDavid Howells /* 3768d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 3778d94aa38SDavid Howells */ 3788d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 3798d94aa38SDavid Howells { 3808d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3818d94aa38SDavid Howells int n = atomic_read(&call->usage); 3828d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 3838d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3842ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 3858d94aa38SDavid Howells else 3868d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3878d94aa38SDavid Howells return true; 3888d94aa38SDavid Howells } 3898d94aa38SDavid Howells 3908d94aa38SDavid Howells /* 391e34d4234SDavid Howells * Note the re-emergence of a call. 392e34d4234SDavid Howells */ 393e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 394e34d4234SDavid Howells { 395e34d4234SDavid Howells const void *here = __builtin_return_address(0); 396e34d4234SDavid Howells if (call) { 397e34d4234SDavid Howells int n = atomic_read(&call->usage); 398e34d4234SDavid Howells 3992ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 400e34d4234SDavid Howells } 401e34d4234SDavid Howells } 402e34d4234SDavid Howells 403e34d4234SDavid Howells /* 404e34d4234SDavid Howells * Note the addition of a ref on a call. 405e34d4234SDavid Howells */ 406fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 407e34d4234SDavid Howells { 408e34d4234SDavid Howells const void *here = __builtin_return_address(0); 409e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 410e34d4234SDavid Howells 4112ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 412e34d4234SDavid Howells } 413e34d4234SDavid Howells 414e34d4234SDavid Howells /* 415248f219cSDavid Howells * Detach a call from its owning socket. 4168c3e34a4SDavid Howells */ 4178d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4188c3e34a4SDavid Howells { 419a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 420248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 421248f219cSDavid Howells bool put = false; 422248f219cSDavid Howells int i; 423248f219cSDavid Howells 424248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 425248f219cSDavid Howells 426a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 427a84a46d7SDavid Howells here, (const void *)call->flags); 4288c3e34a4SDavid Howells 429a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 430e34d4234SDavid Howells 4318c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4328c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4338c3e34a4SDavid Howells BUG(); 4348c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4358c3e34a4SDavid Howells 436248f219cSDavid Howells del_timer_sync(&call->timer); 4378c3e34a4SDavid Howells 438248f219cSDavid Howells /* Make sure we don't get any more notifications */ 439248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 440e653cfe4SDavid Howells 441248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4428c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4438c3e34a4SDavid Howells call, call->events, call->flags); 444248f219cSDavid Howells list_del(&call->recvmsg_link); 445248f219cSDavid Howells put = true; 446248f219cSDavid Howells } 447248f219cSDavid Howells 448248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 449248f219cSDavid Howells call->recvmsg_link.next = NULL; 450248f219cSDavid Howells call->recvmsg_link.prev = NULL; 451248f219cSDavid Howells 452248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 453248f219cSDavid Howells if (put) 454248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 455248f219cSDavid Howells 456248f219cSDavid Howells write_lock(&rx->call_lock); 457248f219cSDavid Howells 458248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 4598c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 4608c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 4618d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 4628c3e34a4SDavid Howells } 4638c3e34a4SDavid Howells 464248f219cSDavid Howells list_del(&call->sock_link); 465248f219cSDavid Howells write_unlock(&rx->call_lock); 4668c3e34a4SDavid Howells 467248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 4688c3e34a4SDavid Howells 469248f219cSDavid Howells if (conn) 470e653cfe4SDavid Howells rxrpc_disconnect_call(call); 471e653cfe4SDavid Howells 472248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 47371f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 47471f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 47571f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 476248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 4778c3e34a4SDavid Howells } 4788c3e34a4SDavid Howells 4798c3e34a4SDavid Howells _leave(""); 4808c3e34a4SDavid Howells } 4818c3e34a4SDavid Howells 4828c3e34a4SDavid Howells /* 4838c3e34a4SDavid Howells * release all the calls associated with a socket 4848c3e34a4SDavid Howells */ 4858c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 4868c3e34a4SDavid Howells { 4878c3e34a4SDavid Howells struct rxrpc_call *call; 4888c3e34a4SDavid Howells 4898c3e34a4SDavid Howells _enter("%p", rx); 4908c3e34a4SDavid Howells 4910360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 4920360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 4930360da6dSDavid Howells struct rxrpc_call, accept_link); 4940360da6dSDavid Howells list_del(&call->accept_link); 4950360da6dSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET); 4960360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 4970360da6dSDavid Howells } 4980360da6dSDavid Howells 499248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 500248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 501248f219cSDavid Howells struct rxrpc_call, sock_link); 502248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 503248f219cSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET); 504248f219cSDavid Howells rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT); 5058d94aa38SDavid Howells rxrpc_release_call(rx, call); 506248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5078c3e34a4SDavid Howells } 5088c3e34a4SDavid Howells 5098c3e34a4SDavid Howells _leave(""); 5108c3e34a4SDavid Howells } 5118c3e34a4SDavid Howells 5128c3e34a4SDavid Howells /* 5138c3e34a4SDavid Howells * release a call 5148c3e34a4SDavid Howells */ 515fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 5168c3e34a4SDavid Howells { 517e34d4234SDavid Howells const void *here = __builtin_return_address(0); 5182ab27215SDavid Howells int n; 519e34d4234SDavid Howells 5208c3e34a4SDavid Howells ASSERT(call != NULL); 5218c3e34a4SDavid Howells 522e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 5232ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 524e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 525e34d4234SDavid Howells if (n == 0) { 5268c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 527248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 528e34d4234SDavid Howells 529248f219cSDavid Howells write_lock(&rxrpc_call_lock); 530248f219cSDavid Howells list_del_init(&call->link); 531248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 532e34d4234SDavid Howells 5338d94aa38SDavid Howells rxrpc_cleanup_call(call); 534e34d4234SDavid Howells } 5358c3e34a4SDavid Howells } 5368c3e34a4SDavid Howells 5378c3e34a4SDavid Howells /* 538dee46364SDavid Howells * Final call destruction under RCU. 539dee46364SDavid Howells */ 540dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 541dee46364SDavid Howells { 542dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 543dee46364SDavid Howells 544df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 545248f219cSDavid Howells kfree(call->rxtx_buffer); 546248f219cSDavid Howells kfree(call->rxtx_annotations); 547dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 548dee46364SDavid Howells } 549dee46364SDavid Howells 550dee46364SDavid Howells /* 5518c3e34a4SDavid Howells * clean up a call 5528c3e34a4SDavid Howells */ 55300e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 5548c3e34a4SDavid Howells { 555248f219cSDavid Howells int i; 5568c3e34a4SDavid Howells 557248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 5588c3e34a4SDavid Howells 5598c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 5608c3e34a4SDavid Howells 561248f219cSDavid Howells del_timer_sync(&call->timer); 5628c3e34a4SDavid Howells 5638d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 5648c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 565e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 5668c3e34a4SDavid Howells 567248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 568248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 56971f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 57071f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 57171f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 5728c3e34a4SDavid Howells 57371f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 5748c3e34a4SDavid Howells 575dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 5768c3e34a4SDavid Howells } 5778c3e34a4SDavid Howells 5788c3e34a4SDavid Howells /* 5798d94aa38SDavid Howells * Make sure that all calls are gone. 5808c3e34a4SDavid Howells */ 5818c3e34a4SDavid Howells void __exit rxrpc_destroy_all_calls(void) 5828c3e34a4SDavid Howells { 5838c3e34a4SDavid Howells struct rxrpc_call *call; 5848c3e34a4SDavid Howells 5858c3e34a4SDavid Howells _enter(""); 5868d94aa38SDavid Howells 5878d94aa38SDavid Howells if (list_empty(&rxrpc_calls)) 5888d94aa38SDavid Howells return; 5898d94aa38SDavid Howells 590248f219cSDavid Howells write_lock(&rxrpc_call_lock); 5918c3e34a4SDavid Howells 5928c3e34a4SDavid Howells while (!list_empty(&rxrpc_calls)) { 5938c3e34a4SDavid Howells call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); 5948c3e34a4SDavid Howells _debug("Zapping call %p", call); 5958c3e34a4SDavid Howells 596e34d4234SDavid Howells rxrpc_see_call(call); 5978c3e34a4SDavid Howells list_del_init(&call->link); 5988c3e34a4SDavid Howells 599248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 6008c3e34a4SDavid Howells call, atomic_read(&call->usage), 6018c3e34a4SDavid Howells rxrpc_call_states[call->state], 6028c3e34a4SDavid Howells call->flags, call->events); 6038c3e34a4SDavid Howells 604248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 6058c3e34a4SDavid Howells cond_resched(); 606248f219cSDavid Howells write_lock(&rxrpc_call_lock); 6078c3e34a4SDavid Howells } 6088c3e34a4SDavid Howells 609248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 6108c3e34a4SDavid Howells } 611