ieee80211_node.h

Linux下SDIO设备的驱动程序

/*
 * Copyright (c) 2001 Atsushi Onoe
 * Copyright (c) 2002-2004 Sam Leffler, Errno Consulting
 * Copyright 2006 ATheros Communications, Inc.
 *
 *  Wireless Network driver for Atheros AR6001
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation;
 *
 *  Software distributed under the License is distributed on an "AS
 *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *  implied. See the License for the specific language governing
 *  rights and limitations under the License.
 *
 *
 */
#ifndef _IEEE80211_NODE_H_
#define _IEEE80211_NODE_H_

/*
 * Node locking definitions.
 */
#define IEEE80211_NODE_LOCK_INIT(_nt)   A_MUTEX_INIT(&(_nt)->nt_nodelock)
#define IEEE80211_NODE_LOCK_DESTROY(_nt)
#define IEEE80211_NODE_LOCK(_nt)        A_MUTEX_LOCK(&(_nt)->nt_nodelock)
#define IEEE80211_NODE_UNLOCK(_nt)      A_MUTEX_UNLOCK(&(_nt)->nt_nodelock)
#define IEEE80211_NODE_LOCK_BH(_nt)     A_MUTEX_LOCK(&(_nt)->nt_nodelock)
#define IEEE80211_NODE_UNLOCK_BH(_nt)   A_MUTEX_UNLOCK(&(_nt)->nt_nodelock)
#define IEEE80211_NODE_LOCK_ASSERT(_nt)

/*
 * Node reference counting definitions.
 *
 * ieee80211_node_initref   initialize the reference count to 1
 * ieee80211_node_incref    add a reference
 * ieee80211_node_decref    remove a reference
 * ieee80211_node_dectestref    remove a reference and return 1 if this
 *              is the last reference, otherwise 0
 * ieee80211_node_refcnt    reference count for printing (only)
 */
#define ieee80211_node_initref(_ni)     ((_ni)->ni_refcnt = 1)
#define ieee80211_node_incref(_ni)      ((_ni)->ni_refcnt++)
#define ieee80211_node_decref(_ni)      ((_ni)->ni_refcnt--)
#define ieee80211_node_dectestref(_ni)  (((_ni)->ni_refcnt--) == 0)
#define ieee80211_node_refcnt(_ni)      ((_ni)->ni_refcnt)

#define IEEE80211_NODE_HASHSIZE 32
/* simple hash is enough for variation of macaddr */
#define IEEE80211_NODE_HASH(addr)   \
    (((const A_UINT8 *)(addr))[IEEE80211_ADDR_LEN - 1] % \
        IEEE80211_NODE_HASHSIZE)

/*
 * Table of ieee80211_node instances.  Each ieee80211com
 * has at least one for holding the scan candidates.
 * When operating as an access point or in ibss mode there
 * is a second table for associated stations or neighbors.
 */
struct ieee80211_node_table {
    void                   *nt_wmip;       /* back reference */
    A_MUTEX_T               nt_nodelock;    /* on node table */
    struct bss              *nt_node_first; /* information of all nodes */
    struct bss              *nt_node_last;  /* information of all nodes */
    struct bss              *nt_hash[IEEE80211_NODE_HASHSIZE];
    const char              *nt_name;   /* for debugging */
    A_UINT32                nt_scangen; /* gen# for timeout scan */
    A_TIMER                 nt_inact_timer;
};

#define WLAN_NODE_INACT_TIMEOUT_MSEC            10000

#endif /* _IEEE80211_NODE_H_ */