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", 56fff72429SDavid Howells [rxrpc_call_seen] = "SEE", 57fff72429SDavid Howells [rxrpc_call_got] = "GOT", 58fff72429SDavid Howells [rxrpc_call_got_userid] = "Gus", 59cbd00891SDavid Howells [rxrpc_call_got_kernel] = "Gke", 60fff72429SDavid Howells [rxrpc_call_put] = "PUT", 61fff72429SDavid Howells [rxrpc_call_put_userid] = "Pus", 62cbd00891SDavid Howells [rxrpc_call_put_kernel] = "Pke", 63fff72429SDavid Howells [rxrpc_call_put_noqueue] = "PNQ", 64fff72429SDavid Howells }; 65fff72429SDavid Howells 668c3e34a4SDavid Howells struct kmem_cache *rxrpc_call_jar; 678c3e34a4SDavid Howells LIST_HEAD(rxrpc_calls); 688c3e34a4SDavid Howells DEFINE_RWLOCK(rxrpc_call_lock); 698c3e34a4SDavid Howells 70248f219cSDavid Howells static void rxrpc_call_timer_expired(unsigned long _call) 71248f219cSDavid Howells { 72248f219cSDavid Howells struct rxrpc_call *call = (struct rxrpc_call *)_call; 73248f219cSDavid Howells 74248f219cSDavid Howells _enter("%d", call->debug_id); 75248f219cSDavid Howells 76248f219cSDavid Howells if (call->state < RXRPC_CALL_COMPLETE) 77248f219cSDavid Howells rxrpc_queue_call(call); 78248f219cSDavid Howells } 798c3e34a4SDavid Howells 808c3e34a4SDavid Howells /* 818c3e34a4SDavid Howells * find an extant server call 828c3e34a4SDavid Howells * - called in process context with IRQs enabled 838c3e34a4SDavid Howells */ 848c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 858c3e34a4SDavid Howells unsigned long user_call_ID) 868c3e34a4SDavid Howells { 878c3e34a4SDavid Howells struct rxrpc_call *call; 888c3e34a4SDavid Howells struct rb_node *p; 898c3e34a4SDavid Howells 908c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 918c3e34a4SDavid Howells 928c3e34a4SDavid Howells read_lock(&rx->call_lock); 938c3e34a4SDavid Howells 948c3e34a4SDavid Howells p = rx->calls.rb_node; 958c3e34a4SDavid Howells while (p) { 968c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 978c3e34a4SDavid Howells 988c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 998c3e34a4SDavid Howells p = p->rb_left; 1008c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 1018c3e34a4SDavid Howells p = p->rb_right; 1028c3e34a4SDavid Howells else 1038c3e34a4SDavid Howells goto found_extant_call; 1048c3e34a4SDavid Howells } 1058c3e34a4SDavid Howells 1068c3e34a4SDavid Howells read_unlock(&rx->call_lock); 1078c3e34a4SDavid Howells _leave(" = NULL"); 1088c3e34a4SDavid Howells return NULL; 1098c3e34a4SDavid Howells 1108c3e34a4SDavid Howells found_extant_call: 111fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got); 1128c3e34a4SDavid Howells read_unlock(&rx->call_lock); 1138c3e34a4SDavid Howells _leave(" = %p [%d]", call, atomic_read(&call->usage)); 1148c3e34a4SDavid Howells return call; 1158c3e34a4SDavid Howells } 1168c3e34a4SDavid Howells 1178c3e34a4SDavid Howells /* 1188c3e34a4SDavid Howells * allocate a new call 1198c3e34a4SDavid Howells */ 12000e90712SDavid Howells struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) 1218c3e34a4SDavid Howells { 1228c3e34a4SDavid Howells struct rxrpc_call *call; 1238c3e34a4SDavid Howells 1248c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1258c3e34a4SDavid Howells if (!call) 1268c3e34a4SDavid Howells return NULL; 1278c3e34a4SDavid Howells 128248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 129248f219cSDavid Howells sizeof(struct sk_buff *), 1308c3e34a4SDavid Howells gfp); 131248f219cSDavid Howells if (!call->rxtx_buffer) 132248f219cSDavid Howells goto nomem; 1338c3e34a4SDavid Howells 134248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 135248f219cSDavid Howells if (!call->rxtx_annotations) 136248f219cSDavid Howells goto nomem_2; 137248f219cSDavid Howells 138248f219cSDavid Howells setup_timer(&call->timer, rxrpc_call_timer_expired, 1398c3e34a4SDavid Howells (unsigned long)call); 1408c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 141999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 14245025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1438c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 144248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 145248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 14645025bceSDavid Howells init_waitqueue_head(&call->waitq); 1478c3e34a4SDavid Howells spin_lock_init(&call->lock); 1488c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1498c3e34a4SDavid Howells atomic_set(&call->usage, 1); 1508c3e34a4SDavid Howells call->debug_id = atomic_inc_return(&rxrpc_debug_id); 1518c3e34a4SDavid Howells 1528c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1538c3e34a4SDavid Howells 154248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 155248f219cSDavid Howells call->rx_winsize = RXRPC_RXTX_BUFF_SIZE - 1 - 46; 156248f219cSDavid Howells call->tx_winsize = 16; 157248f219cSDavid Howells call->rx_expect_next = 1; 1588c3e34a4SDavid Howells return call; 159248f219cSDavid Howells 160248f219cSDavid Howells nomem_2: 161248f219cSDavid Howells kfree(call->rxtx_buffer); 162248f219cSDavid Howells nomem: 163248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 164248f219cSDavid Howells return NULL; 1658c3e34a4SDavid Howells } 1668c3e34a4SDavid Howells 1678c3e34a4SDavid Howells /* 168999b69f8SDavid Howells * Allocate a new client call. 1698c3e34a4SDavid Howells */ 170248f219cSDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx, 1718c3e34a4SDavid Howells gfp_t gfp) 1728c3e34a4SDavid Howells { 1738c3e34a4SDavid Howells struct rxrpc_call *call; 1748c3e34a4SDavid Howells 1758c3e34a4SDavid Howells _enter(""); 1768c3e34a4SDavid Howells 1778c3e34a4SDavid Howells call = rxrpc_alloc_call(gfp); 1788c3e34a4SDavid Howells if (!call) 1798c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 180999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 181999b69f8SDavid Howells call->service_id = srx->srx_service; 182999b69f8SDavid Howells 183999b69f8SDavid Howells _leave(" = %p", call); 184999b69f8SDavid Howells return call; 185999b69f8SDavid Howells } 186999b69f8SDavid Howells 187999b69f8SDavid Howells /* 188248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 189999b69f8SDavid Howells */ 190248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 191999b69f8SDavid Howells { 192248f219cSDavid Howells unsigned long expire_at; 193999b69f8SDavid Howells 194248f219cSDavid Howells expire_at = jiffies + rxrpc_max_call_lifetime; 195248f219cSDavid Howells call->expire_at = expire_at; 196248f219cSDavid Howells call->ack_at = expire_at; 197248f219cSDavid Howells call->resend_at = expire_at; 198248f219cSDavid Howells call->timer.expires = expire_at; 199248f219cSDavid Howells add_timer(&call->timer); 2008c3e34a4SDavid Howells } 2018c3e34a4SDavid Howells 2028c3e34a4SDavid Howells /* 2038c3e34a4SDavid Howells * set up a call for the given data 2048c3e34a4SDavid Howells * - called in process context with IRQs enabled 2058c3e34a4SDavid Howells */ 2068c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 20719ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 208999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 2098c3e34a4SDavid Howells unsigned long user_call_ID, 2108c3e34a4SDavid Howells gfp_t gfp) 2118c3e34a4SDavid Howells { 2128c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 2138c3e34a4SDavid Howells struct rb_node *parent, **pp; 214e34d4234SDavid Howells const void *here = __builtin_return_address(0); 215999b69f8SDavid Howells int ret; 2168c3e34a4SDavid Howells 217999b69f8SDavid Howells _enter("%p,%lx", rx, user_call_ID); 2188c3e34a4SDavid Howells 219248f219cSDavid Howells call = rxrpc_alloc_client_call(srx, gfp); 2208c3e34a4SDavid Howells if (IS_ERR(call)) { 2218c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2228c3e34a4SDavid Howells return call; 2238c3e34a4SDavid Howells } 2248c3e34a4SDavid Howells 2252ab27215SDavid Howells trace_rxrpc_call(call, 0, atomic_read(&call->usage), here, 2262ab27215SDavid Howells (const void *)user_call_ID); 227e34d4234SDavid Howells 228999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2298c3e34a4SDavid Howells call->user_call_ID = user_call_ID; 2308c3e34a4SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 2318c3e34a4SDavid Howells 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 2458c3e34a4SDavid Howells goto found_user_ID_now_present; 2468c3e34a4SDavid Howells } 2478c3e34a4SDavid Howells 248248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 249fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2508c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2518c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 252248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 253248f219cSDavid Howells 2548c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2558c3e34a4SDavid Howells 256248f219cSDavid Howells write_lock(&rxrpc_call_lock); 2578c3e34a4SDavid Howells list_add_tail(&call->link, &rxrpc_calls); 258248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 2598c3e34a4SDavid Howells 260248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 261248f219cSDavid Howells * including channel number and call ID. 262248f219cSDavid Howells */ 263248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 264999b69f8SDavid Howells if (ret < 0) 265999b69f8SDavid Howells goto error; 266999b69f8SDavid Howells 267248f219cSDavid Howells spin_lock_bh(&call->conn->params.peer->lock); 268248f219cSDavid Howells hlist_add_head(&call->error_link, 269248f219cSDavid Howells &call->conn->params.peer->error_targets); 270248f219cSDavid Howells spin_unlock_bh(&call->conn->params.peer->lock); 271248f219cSDavid Howells 272248f219cSDavid Howells rxrpc_start_call_timer(call); 273248f219cSDavid Howells 2748c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2758c3e34a4SDavid Howells 2768c3e34a4SDavid Howells _leave(" = %p [new]", call); 2778c3e34a4SDavid Howells return call; 2788c3e34a4SDavid Howells 279999b69f8SDavid Howells error: 280999b69f8SDavid Howells write_lock(&rx->call_lock); 281999b69f8SDavid Howells rb_erase(&call->sock_node, &rx->calls); 282999b69f8SDavid Howells write_unlock(&rx->call_lock); 283fff72429SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 284999b69f8SDavid Howells 285248f219cSDavid Howells write_lock(&rxrpc_call_lock); 286d1e858c5SDavid Howells list_del_init(&call->link); 287248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 288999b69f8SDavid Howells 2898d94aa38SDavid Howells error_out: 2908d94aa38SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 2918d94aa38SDavid Howells RX_CALL_DEAD, ret); 29217b963e3SDavid Howells set_bit(RXRPC_CALL_RELEASED, &call->flags); 293fff72429SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 294999b69f8SDavid Howells _leave(" = %d", ret); 295999b69f8SDavid Howells return ERR_PTR(ret); 296999b69f8SDavid Howells 2978c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 2988c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 2998c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 3008c3e34a4SDavid Howells * same time in different threads. 3018c3e34a4SDavid Howells */ 3028c3e34a4SDavid Howells found_user_ID_now_present: 3038c3e34a4SDavid Howells write_unlock(&rx->call_lock); 3048d94aa38SDavid Howells ret = -EEXIST; 3058d94aa38SDavid Howells goto error_out; 3068c3e34a4SDavid Howells } 3078c3e34a4SDavid Howells 3088c3e34a4SDavid Howells /* 309248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 310248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3118c3e34a4SDavid Howells */ 312248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 313248f219cSDavid Howells struct rxrpc_call *call, 31442886ffeSDavid Howells struct sk_buff *skb) 3158c3e34a4SDavid Howells { 316248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 31742886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 318248f219cSDavid Howells u32 chan; 3198c3e34a4SDavid Howells 320248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3218c3e34a4SDavid Howells 322248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 323248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 324248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 325248f219cSDavid Howells call->cid = sp->hdr.cid; 326248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 327248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 328248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 3298c3e34a4SDavid Howells 330248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 331248f219cSDavid Howells * only defending against the data_ready handler (which we're called 332248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 333248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 334248f219cSDavid Howells * call pointer). 3358c3e34a4SDavid Howells */ 336248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 337248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 338248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 339a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3408c3e34a4SDavid Howells 34185f32278SDavid Howells spin_lock(&conn->params.peer->lock); 34285f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 34385f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3448c3e34a4SDavid Howells 3458c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3468c3e34a4SDavid Howells 347248f219cSDavid Howells rxrpc_start_call_timer(call); 348248f219cSDavid Howells _leave(""); 3498c3e34a4SDavid Howells } 3508c3e34a4SDavid Howells 3518c3e34a4SDavid Howells /* 3528d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 3538d94aa38SDavid Howells */ 3548d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 3558d94aa38SDavid Howells { 3568d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3578d94aa38SDavid Howells int n = __atomic_add_unless(&call->usage, 1, 0); 3588d94aa38SDavid Howells if (n == 0) 3598d94aa38SDavid Howells return false; 3608d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3612ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 3628d94aa38SDavid Howells else 3638d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3648d94aa38SDavid Howells return true; 3658d94aa38SDavid Howells } 3668d94aa38SDavid Howells 3678d94aa38SDavid Howells /* 3688d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 3698d94aa38SDavid Howells */ 3708d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 3718d94aa38SDavid Howells { 3728d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3738d94aa38SDavid Howells int n = atomic_read(&call->usage); 3748d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 3758d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3762ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 3778d94aa38SDavid Howells else 3788d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3798d94aa38SDavid Howells return true; 3808d94aa38SDavid Howells } 3818d94aa38SDavid Howells 3828d94aa38SDavid Howells /* 383e34d4234SDavid Howells * Note the re-emergence of a call. 384e34d4234SDavid Howells */ 385e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 386e34d4234SDavid Howells { 387e34d4234SDavid Howells const void *here = __builtin_return_address(0); 388e34d4234SDavid Howells if (call) { 389e34d4234SDavid Howells int n = atomic_read(&call->usage); 390e34d4234SDavid Howells 3912ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 392e34d4234SDavid Howells } 393e34d4234SDavid Howells } 394e34d4234SDavid Howells 395e34d4234SDavid Howells /* 396e34d4234SDavid Howells * Note the addition of a ref on a call. 397e34d4234SDavid Howells */ 398fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 399e34d4234SDavid Howells { 400e34d4234SDavid Howells const void *here = __builtin_return_address(0); 401e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 402e34d4234SDavid Howells 4032ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 404e34d4234SDavid Howells } 405e34d4234SDavid Howells 406e34d4234SDavid Howells /* 407248f219cSDavid Howells * Detach a call from its owning socket. 4088c3e34a4SDavid Howells */ 4098d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4108c3e34a4SDavid Howells { 411248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 412248f219cSDavid Howells bool put = false; 413248f219cSDavid Howells int i; 414248f219cSDavid Howells 415248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 416248f219cSDavid Howells 417248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 4188c3e34a4SDavid Howells 419e34d4234SDavid Howells rxrpc_see_call(call); 420e34d4234SDavid Howells 4218c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4228c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4238c3e34a4SDavid Howells BUG(); 4248c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4258c3e34a4SDavid Howells 426248f219cSDavid Howells del_timer_sync(&call->timer); 4278c3e34a4SDavid Howells 428248f219cSDavid Howells /* Make sure we don't get any more notifications */ 429248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 430e653cfe4SDavid Howells 431248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4328c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4338c3e34a4SDavid Howells call, call->events, call->flags); 434248f219cSDavid Howells list_del(&call->recvmsg_link); 435248f219cSDavid Howells put = true; 436248f219cSDavid Howells } 437248f219cSDavid Howells 438248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 439248f219cSDavid Howells call->recvmsg_link.next = NULL; 440248f219cSDavid Howells call->recvmsg_link.prev = NULL; 441248f219cSDavid Howells 442248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 443248f219cSDavid Howells if (put) 444248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 445248f219cSDavid Howells 446248f219cSDavid Howells write_lock(&rx->call_lock); 447248f219cSDavid Howells 448248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 4498c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 4508c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 4518d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 4528c3e34a4SDavid Howells } 4538c3e34a4SDavid Howells 454248f219cSDavid Howells list_del(&call->sock_link); 455248f219cSDavid Howells write_unlock(&rx->call_lock); 4568c3e34a4SDavid Howells 457248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 4588c3e34a4SDavid Howells 459248f219cSDavid Howells if (conn) 460e653cfe4SDavid Howells rxrpc_disconnect_call(call); 461e653cfe4SDavid Howells 462248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 463248f219cSDavid Howells rxrpc_free_skb(call->rxtx_buffer[i]); 464248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 4658c3e34a4SDavid Howells } 4668c3e34a4SDavid Howells 46700e90712SDavid Howells /* We have to release the prealloc backlog ref */ 46800e90712SDavid Howells if (rxrpc_is_service_call(call)) 46900e90712SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 4708c3e34a4SDavid Howells _leave(""); 4718c3e34a4SDavid Howells } 4728c3e34a4SDavid Howells 4738c3e34a4SDavid Howells /* 4748c3e34a4SDavid Howells * release all the calls associated with a socket 4758c3e34a4SDavid Howells */ 4768c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 4778c3e34a4SDavid Howells { 4788c3e34a4SDavid Howells struct rxrpc_call *call; 4798c3e34a4SDavid Howells 4808c3e34a4SDavid Howells _enter("%p", rx); 4818c3e34a4SDavid Howells 482248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 483248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 484248f219cSDavid Howells struct rxrpc_call, sock_link); 485248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 486248f219cSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET); 487248f219cSDavid Howells rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT); 4888d94aa38SDavid Howells rxrpc_release_call(rx, call); 489248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 4908c3e34a4SDavid Howells } 4918c3e34a4SDavid Howells 4928c3e34a4SDavid Howells _leave(""); 4938c3e34a4SDavid Howells } 4948c3e34a4SDavid Howells 4958c3e34a4SDavid Howells /* 4968c3e34a4SDavid Howells * release a call 4978c3e34a4SDavid Howells */ 498fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 4998c3e34a4SDavid Howells { 500e34d4234SDavid Howells const void *here = __builtin_return_address(0); 5012ab27215SDavid Howells int n; 502e34d4234SDavid Howells 5038c3e34a4SDavid Howells ASSERT(call != NULL); 5048c3e34a4SDavid Howells 505e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 5062ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 507e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 508e34d4234SDavid Howells if (n == 0) { 5098c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 510248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 511e34d4234SDavid Howells 512248f219cSDavid Howells write_lock(&rxrpc_call_lock); 513248f219cSDavid Howells list_del_init(&call->link); 514248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 515e34d4234SDavid Howells 5168d94aa38SDavid Howells rxrpc_cleanup_call(call); 517e34d4234SDavid Howells } 5188c3e34a4SDavid Howells } 5198c3e34a4SDavid Howells 5208c3e34a4SDavid Howells /* 521dee46364SDavid Howells * Final call destruction under RCU. 522dee46364SDavid Howells */ 523dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 524dee46364SDavid Howells { 525dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 526dee46364SDavid Howells 527df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 528248f219cSDavid Howells kfree(call->rxtx_buffer); 529248f219cSDavid Howells kfree(call->rxtx_annotations); 530dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 531dee46364SDavid Howells } 532dee46364SDavid Howells 533dee46364SDavid Howells /* 5348c3e34a4SDavid Howells * clean up a call 5358c3e34a4SDavid Howells */ 53600e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 5378c3e34a4SDavid Howells { 538248f219cSDavid Howells int i; 5398c3e34a4SDavid Howells 540248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 5418c3e34a4SDavid Howells 5428c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 5438c3e34a4SDavid Howells 544248f219cSDavid Howells del_timer_sync(&call->timer); 5458c3e34a4SDavid Howells 5468d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 5478c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 548e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 5498c3e34a4SDavid Howells 550248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 551248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 552248f219cSDavid Howells rxrpc_free_skb(call->rxtx_buffer[i]); 5538c3e34a4SDavid Howells 5548c3e34a4SDavid Howells rxrpc_free_skb(call->tx_pending); 5558c3e34a4SDavid Howells 556dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 5578c3e34a4SDavid Howells } 5588c3e34a4SDavid Howells 5598c3e34a4SDavid Howells /* 5608d94aa38SDavid Howells * Make sure that all calls are gone. 5618c3e34a4SDavid Howells */ 5628c3e34a4SDavid Howells void __exit rxrpc_destroy_all_calls(void) 5638c3e34a4SDavid Howells { 5648c3e34a4SDavid Howells struct rxrpc_call *call; 5658c3e34a4SDavid Howells 5668c3e34a4SDavid Howells _enter(""); 5678d94aa38SDavid Howells 5688d94aa38SDavid Howells if (list_empty(&rxrpc_calls)) 5698d94aa38SDavid Howells return; 5708d94aa38SDavid Howells 571248f219cSDavid Howells write_lock(&rxrpc_call_lock); 5728c3e34a4SDavid Howells 5738c3e34a4SDavid Howells while (!list_empty(&rxrpc_calls)) { 5748c3e34a4SDavid Howells call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); 5758c3e34a4SDavid Howells _debug("Zapping call %p", call); 5768c3e34a4SDavid Howells 577e34d4234SDavid Howells rxrpc_see_call(call); 5788c3e34a4SDavid Howells list_del_init(&call->link); 5798c3e34a4SDavid Howells 580248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 5818c3e34a4SDavid Howells call, atomic_read(&call->usage), 5828c3e34a4SDavid Howells rxrpc_call_states[call->state], 5838c3e34a4SDavid Howells call->flags, call->events); 5848c3e34a4SDavid Howells 585248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 5868c3e34a4SDavid Howells cond_resched(); 587248f219cSDavid Howells write_lock(&rxrpc_call_lock); 5888c3e34a4SDavid Howells } 5898c3e34a4SDavid Howells 590248f219cSDavid Howells write_unlock(&rxrpc_call_lock); 5918c3e34a4SDavid Howells } 592