-/* RxRPC virtual connection handler
+/* RxRPC virtual connection handler, common bits.
*
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
#include <linux/slab.h>
#include <linux/net.h>
#include <linux/skbuff.h>
-#include <net/sock.h>
-#include <net/af_rxrpc.h>
#include "ar-internal.h"
/*
static void rxrpc_connection_reaper(struct work_struct *work);
LIST_HEAD(rxrpc_connections);
+LIST_HEAD(rxrpc_connection_proc_list);
DEFINE_RWLOCK(rxrpc_connection_lock);
static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper);
+static void rxrpc_destroy_connection(struct rcu_head *);
+
/*
* allocate a new connection
*/
conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
if (conn) {
+ INIT_LIST_HEAD(&conn->cache_link);
spin_lock_init(&conn->channel_lock);
- init_waitqueue_head(&conn->channel_wq);
+ INIT_LIST_HEAD(&conn->waiting_calls);
INIT_WORK(&conn->processor, &rxrpc_process_connection);
+ INIT_LIST_HEAD(&conn->proc_link);
INIT_LIST_HEAD(&conn->link);
skb_queue_head_init(&conn->rx_queue);
conn->security = &rxrpc_no_security;
spin_lock_init(&conn->state_lock);
- /* We maintain an extra ref on the connection whilst it is
- * on the rxrpc_connections list.
- */
- atomic_set(&conn->usage, 2);
conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
- atomic_set(&conn->avail_chans, RXRPC_MAXCALLS);
conn->size_align = 4;
conn->header_size = sizeof(struct rxrpc_wire_header);
conn->idle_timestamp = jiffies;
* terminates. The caller must hold the channel_lock and must release the
* call's ref on the connection.
*/
-void __rxrpc_disconnect_call(struct rxrpc_call *call)
+void __rxrpc_disconnect_call(struct rxrpc_connection *conn,
+ struct rxrpc_call *call)
{
- struct rxrpc_connection *conn = call->conn;
struct rxrpc_channel *chan =
&conn->channels[call->cid & RXRPC_CHANNELMASK];
/* Save the result of the call so that we can repeat it if necessary
* through the channel, whilst disposing of the actual call record.
*/
- chan->last_result = call->local_abort;
+ chan->last_service_id = call->service_id;
+ if (call->abort_code) {
+ chan->last_abort = call->abort_code;
+ chan->last_type = RXRPC_PACKET_TYPE_ABORT;
+ } else {
+ chan->last_seq = call->rx_hard_ack;
+ chan->last_type = RXRPC_PACKET_TYPE_ACK;
+ }
+ /* Sync with rxrpc_conn_retransmit(). */
smp_wmb();
chan->last_call = chan->call_id;
chan->call_id = chan->call_counter;
rcu_assign_pointer(chan->call, NULL);
- atomic_inc(&conn->avail_chans);
- wake_up(&conn->channel_wq);
}
_leave("");
{
struct rxrpc_connection *conn = call->conn;
+ spin_lock_bh(&conn->params.peer->lock);
+ hlist_del_init(&call->error_link);
+ spin_unlock_bh(&conn->params.peer->lock);
+
+ if (rxrpc_is_client_call(call))
+ return rxrpc_disconnect_client_call(call);
+
spin_lock(&conn->channel_lock);
- __rxrpc_disconnect_call(call);
+ __rxrpc_disconnect_call(conn, call);
spin_unlock(&conn->channel_lock);
call->conn = NULL;
rxrpc_put_connection(conn);
}
+/*
+ * Kill off a connection.
+ */
+void rxrpc_kill_connection(struct rxrpc_connection *conn)
+{
+ ASSERT(!rcu_access_pointer(conn->channels[0].call) &&
+ !rcu_access_pointer(conn->channels[1].call) &&
+ !rcu_access_pointer(conn->channels[2].call) &&
+ !rcu_access_pointer(conn->channels[3].call));
+ ASSERT(list_empty(&conn->cache_link));
+
+ write_lock(&rxrpc_connection_lock);
+ list_del_init(&conn->proc_link);
+ write_unlock(&rxrpc_connection_lock);
+
+ /* Drain the Rx queue. Note that even though we've unpublished, an
+ * incoming packet could still be being added to our Rx queue, so we
+ * will need to drain it again in the RCU cleanup handler.
+ */
+ rxrpc_purge_queue(&conn->rx_queue);
+
+ /* Leave final destruction to RCU. The connection processor work item
+ * must carry a ref on the connection to prevent us getting here whilst
+ * it is queued or running.
+ */
+ call_rcu(&conn->rcu, rxrpc_destroy_connection);
+}
+
/*
* release a virtual connection
*/
}
/*
- * reap dead connections
+ * reap dead service connections
*/
static void rxrpc_connection_reaper(struct work_struct *work)
{
ASSERTCMP(atomic_read(&conn->usage), >, 0);
if (likely(atomic_read(&conn->usage) > 1))
continue;
+ if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
+ continue;
idle_timestamp = READ_ONCE(conn->idle_timestamp);
_debug("reap CONN %d { u=%d,t=%ld }",
continue;
if (rxrpc_conn_is_client(conn))
- rxrpc_unpublish_client_conn(conn);
+ BUG();
else
rxrpc_unpublish_service_conn(conn);
list_del_init(&conn->link);
ASSERTCMP(atomic_read(&conn->usage), ==, 0);
- skb_queue_purge(&conn->rx_queue);
- call_rcu(&conn->rcu, rxrpc_destroy_connection);
+ rxrpc_kill_connection(conn);
}
_leave("");
}
/*
- * preemptively destroy all the connection records rather than waiting for them
- * to time out
+ * preemptively destroy all the service connection records rather than
+ * waiting for them to time out
*/
void __exit rxrpc_destroy_all_connections(void)
{
_enter("");
+ rxrpc_destroy_all_client_connections();
+
rxrpc_connection_expiry = 0;
cancel_delayed_work(&rxrpc_connection_reap);
rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
write_unlock(&rxrpc_connection_lock);
BUG_ON(leak);
+ ASSERT(list_empty(&rxrpc_connection_proc_list));
+
/* Make sure the local and peer records pinned by any dying connections
* are released.
*/
projects / cascardo / linux.git / blobdiff