if_athproto.h

Linux下wifi实现

/*
 * Copyright (c) 2004 Atheros Communications Inc.  All rights reserved.
 *
 * $Id: if_athproto.h 1495 2006-04-06 04:14:07Z jbicket $
 */

#ifndef _NET_IF_ATH_PROTO_H_
#define _NET_IF_ATH_PROTO_H_

/*
 * Atheros proprietary protocol info.
 */

/*
 * Atheros proprietary SuperG defines.
 */

#define ATH_ETH_TYPE  		0x88bd
#define ATH_SNAP_ORGCODE_0	0x00
#define ATH_SNAP_ORGCODE_1	0x03
#define ATH_SNAP_ORGCODE_2	0x7f

struct athl2p_tunnel_hdr {
#if (_BYTE_ORDER == _LITTLE_ENDIAN)
	u_int32_t offset:11,
	seqNum:11,
	optHdrLen32:2,
	frameType:2,
	proto:6;
#else /* big endian */
	u_int32_t proto:6,
	frameType:2,
	optHdrLen32:2,
	seqNum:11,
	offset:11;
#endif
} __packed;

/*
 * The following defines control compiling Atheros-specific features
 * (see BuildCaps.inc):
 *
 *   ATH_SUPERG_FF 
 *      set to 1 for fast-frame
 */

#define ATH_L2TUNNEL_PROTO_FF 0
/* FF max payload: 
 * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500:
 *   8   +   4   +  4   +   14  +   8   + 1500 +  6   +   14  +   8   + 1500
 * = 3066
 */ 
#define ATH_FF_MAX_HDR_PAD	4
#define ATH_FF_MAX_SEP_PAD	6
#define ATH_FF_MAX_HDR		30
#define ATH_FF_MAX_PAYLOAD 	3066
#define ATH_FF_MAX_LEN (ATH_FF_MAX_PAYLOAD + IEEE80211_CRC_LEN + \
    (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + IEEE80211_WEP_CRCLEN))

/*
 * Store a magic number in skb->cb[] area to indicate FF within driver.
 * Offset of 8B into cb[] is used to preserve vlan tag info.
 */
#define ATH_FF_MAGIC_PUT(_skb) \
	(((struct ieee80211_cb *) (_skb)->cb)->flags |= M_FF)
#define ATH_FF_MAGIC_CLR(_skb) \
	(((struct ieee80211_cb *) (_skb)->cb)->flags &= ~M_FF)
#define ATH_FF_MAGIC_PRESENT(_skb) \
	((((struct ieee80211_cb *) (_skb)->cb)->flags & M_FF) != 0)
#define ATH_FF_NEXTSKB_PUT(_skb, _next) \
	(((struct ieee80211_cb *) (_skb)->cb)->next = _next)
#define ATH_FF_NEXTSKB_GET(_skb) \
	(((struct ieee80211_cb *) (_skb)->cb)->next)

/*
 * default value for the minimum txq depth required for an ath_buf to be
 * placed on the FF staging queue. this value should be >=3 due to interaction
 * with HW compression.
 */
#define ATH_FF_TXQMIN		3

/* 
 * default maximum age an ath_buf is allowed to remain on the staging queue.
 * When this number of ath_bufs have been queued on the txq, after an ath_buf
 * was placed on the staging queue, that ath_buf on the staging queue will be
 * flushed.
 */
#define ATH_FF_STAGEQAGEMAX	5

/*
 * Reserve enough buffer header length to avoid reallocation on fast-frame
 * rx and tx.
 */
#define USE_HEADERLEN_RESV	1

#endif /* _NET_IF_ATH_PROTO_H_ */