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 /* 238c3e34a4SDavid Howells * Maximum lifetime of a call (in jiffies). 248c3e34a4SDavid Howells */ 258c3e34a4SDavid Howells unsigned int rxrpc_max_call_lifetime = 60 * HZ; 268c3e34a4SDavid Howells 278c3e34a4SDavid Howells const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { 28999b69f8SDavid Howells [RXRPC_CALL_UNINITIALISED] = "Uninit ", 29999b69f8SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", 308c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", 318c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", 328c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", 3300e90712SDavid Howells [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", 348c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SECURING] = "SvSecure", 358c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", 368c3e34a4SDavid Howells [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 378c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 388c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 398c3e34a4SDavid Howells [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 408c3e34a4SDavid Howells [RXRPC_CALL_COMPLETE] = "Complete", 41f5c17aaeSDavid Howells }; 42f5c17aaeSDavid Howells 43f5c17aaeSDavid Howells const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 44f5c17aaeSDavid Howells [RXRPC_CALL_SUCCEEDED] = "Complete", 458c3e34a4SDavid Howells [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 468c3e34a4SDavid Howells [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 47f5c17aaeSDavid Howells [RXRPC_CALL_LOCAL_ERROR] = "LocError", 488c3e34a4SDavid Howells [RXRPC_CALL_NETWORK_ERROR] = "NetError", 498c3e34a4SDavid Howells }; 508c3e34a4SDavid Howells 51fff72429SDavid Howells const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = { 52fff72429SDavid Howells [rxrpc_call_new_client] = "NWc", 53fff72429SDavid Howells [rxrpc_call_new_service] = "NWs", 54fff72429SDavid Howells [rxrpc_call_queued] = "QUE", 55fff72429SDavid Howells [rxrpc_call_queued_ref] = "QUR", 56a84a46d7SDavid Howells [rxrpc_call_connected] = "CON", 57a84a46d7SDavid Howells [rxrpc_call_release] = "RLS", 58fff72429SDavid Howells [rxrpc_call_seen] = "SEE", 59fff72429SDavid Howells [rxrpc_call_got] = "GOT", 60fff72429SDavid Howells [rxrpc_call_got_userid] = "Gus", 61cbd00891SDavid Howells [rxrpc_call_got_kernel] = "Gke", 62fff72429SDavid Howells [rxrpc_call_put] = "PUT", 63fff72429SDavid Howells [rxrpc_call_put_userid] = "Pus", 64cbd00891SDavid Howells [rxrpc_call_put_kernel] = "Pke", 65fff72429SDavid Howells [rxrpc_call_put_noqueue] = "PNQ", 66a84a46d7SDavid Howells [rxrpc_call_error] = "*E*", 67fff72429SDavid Howells }; 68fff72429SDavid Howells 698c3e34a4SDavid Howells struct kmem_cache *rxrpc_call_jar; 708c3e34a4SDavid Howells LIST_HEAD(rxrpc_calls); 718c3e34a4SDavid Howells DEFINE_RWLOCK(rxrpc_call_lock); 728c3e34a4SDavid Howells 73248f219cSDavid Howells static void rxrpc_call_timer_expired(unsigned long _call) 74248f219cSDavid Howells { 75248f219cSDavid Howells struct rxrpc_call *call = (struct rxrpc_call *)_call; 76248f219cSDavid Howells 77248f219cSDavid Howells _enter("%d", call->debug_id); 78248f219cSDavid Howells 79fc7ab6d2SDavid Howells if (call->state < RXRPC_CALL_COMPLETE) { 80fc7ab6d2SDavid Howells trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); 81248f219cSDavid Howells rxrpc_queue_call(call); 82248f219cSDavid Howells } 83fc7ab6d2SDavid Howells } 848c3e34a4SDavid Howells 858c3e34a4SDavid Howells /* 868c3e34a4SDavid Howells * find an extant server call 878c3e34a4SDavid Howells * - called in process context with IRQs enabled 888c3e34a4SDavid Howells */ 898c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 908c3e34a4SDavid Howells unsigned long user_call_ID) 918c3e34a4SDavid Howells { 928c3e34a4SDavid Howells struct rxrpc_call *call; 938c3e34a4SDavid Howells struct rb_node *p; 948c3e34a4SDavid Howells 958c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 968c3e34a4SDavid Howells 978c3e34a4SDavid Howells read_lock(&rx->call_lock); 988c3e34a4SDavid Howells 998c3e34a4SDavid Howells p = rx->calls.rb_node; 1008c3e34a4SDavid Howells while (p) { 1018c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 1028c3e34a4SDavid Howells 1038c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 1048c3e34a4SDavid Howells p = p->rb_left; 1058c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 1068c3e34a4SDavid Howells p = p->rb_right; 1078c3e34a4SDavid Howells else 1088c3e34a4SDavid Howells goto found_extant_call; 1098c3e34a4SDavid Howells } 1108c3e34a4SDavid Howells 1118c3e34a4SDavid Howells read_unlock(&rx->call_lock); 1128c3e34a4SDavid Howells _leave(" = NULL"); 1138c3e34a4SDavid Howells return NULL; 1148c3e34a4SDavid Howells 1158c3e34a4SDavid Howells found_extant_call: 116fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got); 1178c3e34a4SDavid Howells read_unlock(&rx->call_lock); 1188c3e34a4SDavid Howells _leave(" = %p [%d]", call, atomic_read(&call->usage)); 1198c3e34a4SDavid Howells return call; 1208c3e34a4SDavid Howells } 1218c3e34a4SDavid Howells 1228c3e34a4SDavid Howells /* 1238c3e34a4SDavid Howells * allocate a new call 1248c3e34a4SDavid Howells */ 12500e90712SDavid Howells struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) 1268c3e34a4SDavid Howells { 1278c3e34a4SDavid Howells struct rxrpc_call *call; 1288c3e34a4SDavid Howells 1298c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1308c3e34a4SDavid Howells if (!call) 1318c3e34a4SDavid Howells return NULL; 1328c3e34a4SDavid Howells 133248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 134248f219cSDavid Howells sizeof(struct sk_buff *), 1358c3e34a4SDavid Howells gfp); 136248f219cSDavid Howells if (!call->rxtx_buffer) 137248f219cSDavid Howells goto nomem; 1388c3e34a4SDavid Howells 139248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 140248f219cSDavid Howells if (!call->rxtx_annotations) 141248f219cSDavid Howells goto nomem_2; 142248f219cSDavid Howells 143248f219cSDavid Howells setup_timer(&call->timer, rxrpc_call_timer_expired, 1448c3e34a4SDavid Howells (unsigned long)call); 1458c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 146999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 14745025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1488c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 149248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 150248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 15145025bceSDavid Howells init_waitqueue_head(&call->waitq); 1528c3e34a4SDavid Howells spin_lock_init(&call->lock); 1538c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1548c3e34a4SDavid Howells atomic_set(&call->usage, 1); 1558c3e34a4SDavid Howells call->debug_id = atomic_inc_return(&rxrpc_debug_id); 1568c3e34a4SDavid Howells 1578c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1588c3e34a4SDavid Howells 159248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 16075e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 161248f219cSDavid Howells call->tx_winsize = 16; 162248f219cSDavid Howells call->rx_expect_next = 1; 16357494343SDavid Howells 16457494343SDavid Howells if (RXRPC_TX_SMSS > 2190) 16557494343SDavid Howells call->cong_cwnd = 2; 16657494343SDavid Howells else if (RXRPC_TX_SMSS > 1095) 16757494343SDavid Howells call->cong_cwnd = 3; 16857494343SDavid Howells else 16957494343SDavid Howells call->cong_cwnd = 4; 17057494343SDavid Howells call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 1718c3e34a4SDavid Howells return call; 172248f219cSDavid Howells 173248f219cSDavid Howells nomem_2: 174248f219cSDavid Howells kfree(call->rxtx_buffer); 175248f219cSDavid Howells nomem: 176248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 177248f219cSDavid Howells return NULL; 1788c3e34a4SDavid Howells } 1798c3e34a4SDavid Howells 1808c3e34a4SDavid Howells /* 181999b69f8SDavid Howells * Allocate a new client call. 1828c3e34a4SDavid Howells */ 183248f219cSDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx, 1848c3e34a4SDavid Howells gfp_t gfp) 1858c3e34a4SDavid Howells { 1868c3e34a4SDavid Howells struct rxrpc_call *call; 18757494343SDavid Howells ktime_t now; 1888c3e34a4SDavid Howells 1898c3e34a4SDavid Howells _enter(""); 1908c3e34a4SDavid Howells 1918c3e34a4SDavid Howells call = rxrpc_alloc_call(gfp); 1928c3e34a4SDavid Howells if (!call) 1938c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 194999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 195999b69f8SDavid Howells call->service_id = srx->srx_service; 19671f3ca40SDavid Howells call->tx_phase = true; 19757494343SDavid Howells now = ktime_get_real(); 19857494343SDavid Howells call->acks_latest_ts = now; 19957494343SDavid Howells call->cong_tstamp = now; 200999b69f8SDavid Howells 201999b69f8SDavid Howells _leave(" = %p", call); 202999b69f8SDavid Howells return call; 203999b69f8SDavid Howells } 204999b69f8SDavid Howells 205999b69f8SDavid Howells /* 206248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 207999b69f8SDavid Howells */ 208248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 209999b69f8SDavid Howells { 210248f219cSDavid Howells unsigned long expire_at; 211999b69f8SDavid Howells 212248f219cSDavid Howells expire_at = jiffies + rxrpc_max_call_lifetime; 213248f219cSDavid Howells call->expire_at = expire_at; 214248f219cSDavid Howells call->ack_at = expire_at; 215248f219cSDavid Howells call->resend_at = expire_at; 21601a88f7fSDavid Howells call->timer.expires = expire_at + 1; 217fc7ab6d2SDavid Howells rxrpc_set_timer(call, rxrpc_timer_begin); 2188c3e34a4SDavid Howells } 2198c3e34a4SDavid Howells 2208c3e34a4SDavid Howells /* 2218c3e34a4SDavid Howells * set up a call for the given data 2228c3e34a4SDavid Howells * - called in process context with IRQs enabled 2238c3e34a4SDavid Howells */ 2248c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 22519ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 226999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 2278c3e34a4SDavid Howells unsigned long user_call_ID, 2288c3e34a4SDavid Howells gfp_t gfp) 2298c3e34a4SDavid Howells { 2308c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 2318c3e34a4SDavid Howells struct rb_node *parent, **pp; 232e34d4234SDavid Howells const void *here = __builtin_return_address(0); 233999b69f8SDavid Howells int ret; 2348c3e34a4SDavid Howells 235999b69f8SDavid Howells _enter("%p,%lx", rx, user_call_ID); 2368c3e34a4SDavid Howells 237248f219cSDavid Howells call = rxrpc_alloc_client_call(srx, gfp); 2388c3e34a4SDavid Howells if (IS_ERR(call)) { 2398c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2408c3e34a4SDavid Howells return call; 2418c3e34a4SDavid Howells } 2428c3e34a4SDavid Howells 243a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 244a84a46d7SDavid Howells here, (const void *)user_call_ID); 245e34d4234SDavid Howells 246999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2478c3e34a4SDavid Howells write_lock(&rx->call_lock); 2488c3e34a4SDavid Howells 2498c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2508c3e34a4SDavid Howells parent = NULL; 2518c3e34a4SDavid Howells while (*pp) { 2528c3e34a4SDavid Howells parent = *pp; 2538c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2548c3e34a4SDavid Howells 2558c3e34a4SDavid Howells if (user_call_ID < xcall->user_call_ID) 2568c3e34a4SDavid Howells pp = &(*pp)->rb_left; 2578c3e34a4SDavid Howells else if (user_call_ID > xcall->user_call_ID) 2588c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2598c3e34a4SDavid Howells else 260357f5ef6SDavid Howells goto error_dup_user_ID; 2618c3e34a4SDavid Howells } 2628c3e34a4SDavid Howells 263248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 264357f5ef6SDavid Howells call->user_call_ID = user_call_ID; 265357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 266fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2678c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2688c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 269248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 270248f219cSDavid Howells 2718c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2728c3e34a4SDavid Howells 273248f219cSDavid Howells write_lock(&rxrpc_call_lock); 2748c3e34a4SDavid Howells list_add_tail(&call->link, &rxrpc_calls); 275248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 2768c3e34a4SDavid Howells 277248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 278248f219cSDavid Howells * including channel number and call ID. 279248f219cSDavid Howells */ 280248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 281999b69f8SDavid Howells if (ret < 0) 282999b69f8SDavid Howells goto error; 283999b69f8SDavid Howells 284a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 285a84a46d7SDavid Howells here, ERR_PTR(ret)); 286a84a46d7SDavid Howells 287248f219cSDavid Howells spin_lock_bh(&call->conn->params.peer->lock); 288248f219cSDavid Howells hlist_add_head(&call->error_link, 289248f219cSDavid Howells &call->conn->params.peer->error_targets); 290248f219cSDavid Howells spin_unlock_bh(&call->conn->params.peer->lock); 291248f219cSDavid Howells 292248f219cSDavid Howells rxrpc_start_call_timer(call); 293248f219cSDavid Howells 2948c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2958c3e34a4SDavid Howells 2968c3e34a4SDavid Howells _leave(" = %p [new]", call); 2978c3e34a4SDavid Howells return call; 2988c3e34a4SDavid Howells 2998c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 3008c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 3018c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 3028c3e34a4SDavid Howells * same time in different threads. 3038c3e34a4SDavid Howells */ 304357f5ef6SDavid Howells error_dup_user_ID: 3058c3e34a4SDavid Howells write_unlock(&rx->call_lock); 3068d94aa38SDavid Howells ret = -EEXIST; 307357f5ef6SDavid Howells 308357f5ef6SDavid Howells error: 309357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 310357f5ef6SDavid Howells RX_CALL_DEAD, ret); 311a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 312a84a46d7SDavid Howells here, ERR_PTR(ret)); 313357f5ef6SDavid Howells rxrpc_release_call(rx, call); 314357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 315357f5ef6SDavid Howells _leave(" = %d", ret); 316357f5ef6SDavid Howells return ERR_PTR(ret); 3178c3e34a4SDavid Howells } 3188c3e34a4SDavid Howells 3198c3e34a4SDavid Howells /* 320248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 321248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3228c3e34a4SDavid Howells */ 323248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 324248f219cSDavid Howells struct rxrpc_call *call, 32542886ffeSDavid Howells struct sk_buff *skb) 3268c3e34a4SDavid Howells { 327248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 32842886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 329248f219cSDavid Howells u32 chan; 3308c3e34a4SDavid Howells 331248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3328c3e34a4SDavid Howells 333248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 334248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 335248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 336248f219cSDavid Howells call->cid = sp->hdr.cid; 337248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 338248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 339248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 34057494343SDavid Howells call->cong_tstamp = skb->tstamp; 3418c3e34a4SDavid Howells 342248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 343248f219cSDavid Howells * only defending against the data_ready handler (which we're called 344248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 345248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 346248f219cSDavid Howells * call pointer). 3478c3e34a4SDavid Howells */ 348248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 349248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 350248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 351a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3528c3e34a4SDavid Howells 35385f32278SDavid Howells spin_lock(&conn->params.peer->lock); 35485f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 35585f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3568c3e34a4SDavid Howells 3578c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3588c3e34a4SDavid Howells 359248f219cSDavid Howells rxrpc_start_call_timer(call); 360248f219cSDavid Howells _leave(""); 3618c3e34a4SDavid Howells } 3628c3e34a4SDavid Howells 3638c3e34a4SDavid Howells /* 3648d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 3658d94aa38SDavid Howells */ 3668d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 3678d94aa38SDavid Howells { 3688d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3698d94aa38SDavid Howells int n = __atomic_add_unless(&call->usage, 1, 0); 3708d94aa38SDavid Howells if (n == 0) 3718d94aa38SDavid Howells return false; 3728d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3732ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 3748d94aa38SDavid Howells else 3758d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3768d94aa38SDavid Howells return true; 3778d94aa38SDavid Howells } 3788d94aa38SDavid Howells 3798d94aa38SDavid Howells /* 3808d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 3818d94aa38SDavid Howells */ 3828d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 3838d94aa38SDavid Howells { 3848d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3858d94aa38SDavid Howells int n = atomic_read(&call->usage); 3868d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 3878d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3882ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 3898d94aa38SDavid Howells else 3908d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3918d94aa38SDavid Howells return true; 3928d94aa38SDavid Howells } 3938d94aa38SDavid Howells 3948d94aa38SDavid Howells /* 395e34d4234SDavid Howells * Note the re-emergence of a call. 396e34d4234SDavid Howells */ 397e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 398e34d4234SDavid Howells { 399e34d4234SDavid Howells const void *here = __builtin_return_address(0); 400e34d4234SDavid Howells if (call) { 401e34d4234SDavid Howells int n = atomic_read(&call->usage); 402e34d4234SDavid Howells 4032ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 404e34d4234SDavid Howells } 405e34d4234SDavid Howells } 406e34d4234SDavid Howells 407e34d4234SDavid Howells /* 408e34d4234SDavid Howells * Note the addition of a ref on a call. 409e34d4234SDavid Howells */ 410fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 411e34d4234SDavid Howells { 412e34d4234SDavid Howells const void *here = __builtin_return_address(0); 413e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 414e34d4234SDavid Howells 4152ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 416e34d4234SDavid Howells } 417e34d4234SDavid Howells 418e34d4234SDavid Howells /* 419248f219cSDavid Howells * Detach a call from its owning socket. 4208c3e34a4SDavid Howells */ 4218d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4228c3e34a4SDavid Howells { 423a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 424248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 425248f219cSDavid Howells bool put = false; 426248f219cSDavid Howells int i; 427248f219cSDavid Howells 428248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 429248f219cSDavid Howells 430a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 431a84a46d7SDavid Howells here, (const void *)call->flags); 4328c3e34a4SDavid Howells 433a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 434e34d4234SDavid Howells 4358c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4368c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4378c3e34a4SDavid Howells BUG(); 4388c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4398c3e34a4SDavid Howells 440248f219cSDavid Howells del_timer_sync(&call->timer); 4418c3e34a4SDavid Howells 442248f219cSDavid Howells /* Make sure we don't get any more notifications */ 443248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 444e653cfe4SDavid Howells 445248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4468c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4478c3e34a4SDavid Howells call, call->events, call->flags); 448248f219cSDavid Howells list_del(&call->recvmsg_link); 449248f219cSDavid Howells put = true; 450248f219cSDavid Howells } 451248f219cSDavid Howells 452248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 453248f219cSDavid Howells call->recvmsg_link.next = NULL; 454248f219cSDavid Howells call->recvmsg_link.prev = NULL; 455248f219cSDavid Howells 456248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 457248f219cSDavid Howells if (put) 458248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 459248f219cSDavid Howells 460248f219cSDavid Howells write_lock(&rx->call_lock); 461248f219cSDavid Howells 462248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 4638c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 4648c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 4658d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 4668c3e34a4SDavid Howells } 4678c3e34a4SDavid Howells 468248f219cSDavid Howells list_del(&call->sock_link); 469248f219cSDavid Howells write_unlock(&rx->call_lock); 4708c3e34a4SDavid Howells 471248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 4728c3e34a4SDavid Howells 473248f219cSDavid Howells if (conn) 474e653cfe4SDavid Howells rxrpc_disconnect_call(call); 475e653cfe4SDavid Howells 476248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 47771f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 47871f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 47971f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 480248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 4818c3e34a4SDavid Howells } 4828c3e34a4SDavid Howells 4838c3e34a4SDavid Howells _leave(""); 4848c3e34a4SDavid Howells } 4858c3e34a4SDavid Howells 4868c3e34a4SDavid Howells /* 4878c3e34a4SDavid Howells * release all the calls associated with a socket 4888c3e34a4SDavid Howells */ 4898c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 4908c3e34a4SDavid Howells { 4918c3e34a4SDavid Howells struct rxrpc_call *call; 4928c3e34a4SDavid Howells 4938c3e34a4SDavid Howells _enter("%p", rx); 4948c3e34a4SDavid Howells 4950360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 4960360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 4970360da6dSDavid Howells struct rxrpc_call, accept_link); 4980360da6dSDavid Howells list_del(&call->accept_link); 4990360da6dSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET); 5000360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5010360da6dSDavid Howells } 5020360da6dSDavid Howells 503248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 504248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 505248f219cSDavid Howells struct rxrpc_call, sock_link); 506248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 507248f219cSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET); 508248f219cSDavid Howells rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT); 5098d94aa38SDavid Howells rxrpc_release_call(rx, call); 510248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5118c3e34a4SDavid Howells } 5128c3e34a4SDavid Howells 5138c3e34a4SDavid Howells _leave(""); 5148c3e34a4SDavid Howells } 5158c3e34a4SDavid Howells 5168c3e34a4SDavid Howells /* 5178c3e34a4SDavid Howells * release a call 5188c3e34a4SDavid Howells */ 519fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 5208c3e34a4SDavid Howells { 521e34d4234SDavid Howells const void *here = __builtin_return_address(0); 5222ab27215SDavid Howells int n; 523e34d4234SDavid Howells 5248c3e34a4SDavid Howells ASSERT(call != NULL); 5258c3e34a4SDavid Howells 526e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 5272ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 528e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 529e34d4234SDavid Howells if (n == 0) { 5308c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 531248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 532e34d4234SDavid Howells 533248f219cSDavid Howells write_lock(&rxrpc_call_lock); 534248f219cSDavid Howells list_del_init(&call->link); 535248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 536e34d4234SDavid Howells 5378d94aa38SDavid Howells rxrpc_cleanup_call(call); 538e34d4234SDavid Howells } 5398c3e34a4SDavid Howells } 5408c3e34a4SDavid Howells 5418c3e34a4SDavid Howells /* 542dee46364SDavid Howells * Final call destruction under RCU. 543dee46364SDavid Howells */ 544dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 545dee46364SDavid Howells { 546dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 547dee46364SDavid Howells 548df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 549248f219cSDavid Howells kfree(call->rxtx_buffer); 550248f219cSDavid Howells kfree(call->rxtx_annotations); 551dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 552dee46364SDavid Howells } 553dee46364SDavid Howells 554dee46364SDavid Howells /* 5558c3e34a4SDavid Howells * clean up a call 5568c3e34a4SDavid Howells */ 55700e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 5588c3e34a4SDavid Howells { 559248f219cSDavid Howells int i; 5608c3e34a4SDavid Howells 561248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 5628c3e34a4SDavid Howells 5638c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 5648c3e34a4SDavid Howells 565248f219cSDavid Howells del_timer_sync(&call->timer); 5668c3e34a4SDavid Howells 5678d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 5688c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 569e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 5708c3e34a4SDavid Howells 571248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 572248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 57371f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 57471f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 57571f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 5768c3e34a4SDavid Howells 57771f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 5788c3e34a4SDavid Howells 579dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 5808c3e34a4SDavid Howells } 5818c3e34a4SDavid Howells 5828c3e34a4SDavid Howells /* 5838d94aa38SDavid Howells * Make sure that all calls are gone. 5848c3e34a4SDavid Howells */ 5858c3e34a4SDavid Howells void __exit rxrpc_destroy_all_calls(void) 5868c3e34a4SDavid Howells { 5878c3e34a4SDavid Howells struct rxrpc_call *call; 5888c3e34a4SDavid Howells 5898c3e34a4SDavid Howells _enter(""); 5908d94aa38SDavid Howells 5918d94aa38SDavid Howells if (list_empty(&rxrpc_calls)) 5928d94aa38SDavid Howells return; 5938d94aa38SDavid Howells 594248f219cSDavid Howells write_lock(&rxrpc_call_lock); 5958c3e34a4SDavid Howells 5968c3e34a4SDavid Howells while (!list_empty(&rxrpc_calls)) { 5978c3e34a4SDavid Howells call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); 5988c3e34a4SDavid Howells _debug("Zapping call %p", call); 5998c3e34a4SDavid Howells 600e34d4234SDavid Howells rxrpc_see_call(call); 6018c3e34a4SDavid Howells list_del_init(&call->link); 6028c3e34a4SDavid Howells 603248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 6048c3e34a4SDavid Howells call, atomic_read(&call->usage), 6058c3e34a4SDavid Howells rxrpc_call_states[call->state], 6068c3e34a4SDavid Howells call->flags, call->events); 6078c3e34a4SDavid Howells 608248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 6098c3e34a4SDavid Howells cond_resched(); 610248f219cSDavid Howells write_lock(&rxrpc_call_lock); 6118c3e34a4SDavid Howells } 6128c3e34a4SDavid Howells 613248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 6148c3e34a4SDavid Howells } 615