rtl8192eu-linux-driver/include/rtw_recv.h

/******************************************************************************
 *
 * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 *
 ******************************************************************************/
#ifndef _RTW_RECV_H_
#define _RTW_RECV_H_

#ifdef PLATFORM_OS_XP
	#ifdef CONFIG_SDIO_HCI
		#define NR_RECVBUFF 1024//512//128
	#else
		#define NR_RECVBUFF (16)
	#endif
#elif defined(PLATFORM_OS_CE)
	#ifdef CONFIG_SDIO_HCI
		#define NR_RECVBUFF (128)
	#else
		#define NR_RECVBUFF (4)
	#endif
#else //PLATFORM_LINUX /PLATFORM_BSD

	#ifdef CONFIG_SINGLE_RECV_BUF
		#define NR_RECVBUFF (1)
	#else
		#if defined(CONFIG_GSPI_HCI)
			#define NR_RECVBUFF (32)
		#elif defined(CONFIG_SDIO_HCI)
			#define NR_RECVBUFF (8)	
		#else
			#define NR_RECVBUFF (8)
		#endif	
	#endif //CONFIG_SINGLE_RECV_BUF
	#ifdef CONFIG_PREALLOC_RX_SKB_BUFFER
		#define NR_PREALLOC_RECV_SKB (rtw_rtkm_get_nr_recv_skb()>>1)
	#else /*!CONFIG_PREALLOC_RX_SKB_BUFFER */
		#define NR_PREALLOC_RECV_SKB 8
	#endif /* CONFIG_PREALLOC_RX_SKB_BUFFER */

#endif

#define NR_RECVFRAME 256

#define RXFRAME_ALIGN	8
#define RXFRAME_ALIGN_SZ	(1<<RXFRAME_ALIGN)

#define DRVINFO_SZ	4 // unit is 8bytes

#define MAX_RXFRAME_CNT	512
#define MAX_RX_NUMBLKS		(32)
#define RECVFRAME_HDR_ALIGN 128
#define MAX_CONTINUAL_NORXPACKET_COUNT 4    /*  In MAX_CONTINUAL_NORXPACKET_COUNT*2 sec  , no rx traffict would issue DELBA*/

#define PHY_RSSI_SLID_WIN_MAX				100
#define PHY_LINKQUALITY_SLID_WIN_MAX		20


#define SNAP_SIZE sizeof(struct ieee80211_snap_hdr)

#define RX_MPDU_QUEUE				0
#define RX_CMD_QUEUE				1
#define RX_MAX_QUEUE				2

static u8 SNAP_ETH_TYPE_IPX[2] = {0x81, 0x37};

static u8 SNAP_ETH_TYPE_APPLETALK_AARP[2] = {0x80, 0xf3};
static u8 SNAP_ETH_TYPE_APPLETALK_DDP[2] = {0x80, 0x9b};
static u8 SNAP_ETH_TYPE_TDLS[2] = {0x89, 0x0d};
static u8 SNAP_HDR_APPLETALK_DDP[3] = {0x08, 0x00, 0x07}; // Datagram Delivery Protocol

static u8 oui_8021h[] = {0x00, 0x00, 0xf8};
static u8 oui_rfc1042[]= {0x00,0x00,0x00};

#define MAX_SUBFRAME_COUNT	64
static u8 rtw_rfc1042_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static u8 rtw_bridge_tunnel_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };

//for Rx reordering buffer control
struct recv_reorder_ctrl
{
	_adapter	*padapter;
	u8 enable;
	u16 indicate_seq;//=wstart_b, init_value=0xffff
	u16 wend_b;
	u8 wsize_b;
	u8 ampdu_size;
	_queue pending_recvframe_queue;
	_timer reordering_ctrl_timer;
	u8 bReorderWaiting;
};

struct	stainfo_rxcache	{
	u16 	tid_rxseq[16];
/*
	unsigned short 	tid0_rxseq;
	unsigned short 	tid1_rxseq;
	unsigned short 	tid2_rxseq;
	unsigned short 	tid3_rxseq;
	unsigned short 	tid4_rxseq;
	unsigned short 	tid5_rxseq;
	unsigned short 	tid6_rxseq;
	unsigned short 	tid7_rxseq;
	unsigned short 	tid8_rxseq;
	unsigned short 	tid9_rxseq;
	unsigned short 	tid10_rxseq;
	unsigned short 	tid11_rxseq;
	unsigned short 	tid12_rxseq;
	unsigned short 	tid13_rxseq;
	unsigned short 	tid14_rxseq;
	unsigned short 	tid15_rxseq;
*/
};


struct smooth_rssi_data {
	u32	elements[100];	//array to store values
	u32	index;			//index to current array to store
	u32	total_num;		//num of valid elements
	u32	total_val;		//sum of valid elements
};

struct signal_stat {
	u8	update_req;		//used to indicate 
	u8	avg_val;		//avg of valid elements
	u32	total_num;		//num of valid elements
	u32	total_val;		//sum of valid elements	
};
/*
typedef struct _ODM_Phy_Status_Info_
{
	//
	// Be care, if you want to add any element please insert between 
	// RxPWDBAll & SignalStrength.
	//
#if (DM_ODM_SUPPORT_TYPE &  (ODM_WIN))
	u4Byte		RxPWDBAll;	
#else
	u1Byte		RxPWDBAll;	
#endif

	u1Byte		SignalQuality;	 		// in 0-100 index. 
	s1Byte		RxMIMOSignalQuality[4];	//per-path's EVM
	u1Byte		RxMIMOEVMdbm[4]; 		//per-path's EVM dbm

	u1Byte		RxMIMOSignalStrength[4];// in 0~100 index

	u2Byte		Cfo_short[4]; 			// per-path's Cfo_short
	u2Byte		Cfo_tail[4];			// per-path's Cfo_tail
	
#if (DM_ODM_SUPPORT_TYPE &  (ODM_WIN|ODM_CE))
	s1Byte		RxPower;				// in dBm Translate from PWdB
	s1Byte		RecvSignalPower;		// Real power in dBm for this packet, no beautification and aggregation. Keep this raw info to be used for the other procedures.
	u1Byte		BTRxRSSIPercentage;	
	u1Byte		SignalStrength; 		// in 0-100 index.
 
	u1Byte		RxPwr[4];				//per-path's pwdb
#endif
	u1Byte		RxSNR[4];				//per-path's SNR	
	u1Byte		BandWidth;
	u1Byte		btCoexPwrAdjust;
}ODM_PHY_INFO_T,*PODM_PHY_INFO_T;
*/

struct phy_info
{		
	u8			RxPWDBAll;
	u8			SignalQuality;				/* in 0-100 index. */
	s8			RxMIMOSignalQuality[4];		/* per-path's EVM */
	u8			RxMIMOEVMdbm[4];			/* per-path's EVM dbm */
	u8			RxMIMOSignalStrength[4];	/* in 0~100 index */
	s16			Cfo_short[4];				/* per-path's Cfo_short */
	s16			Cfo_tail[4];					/* per-path's Cfo_tail */
	s8			RxPower;					/* in dBm Translate from PWdB */
	s8			RecvSignalPower;			/* Real power in dBm for this packet, no beautification and aggregation. Keep this raw info to be used for the other procedures. */
	u8			BTRxRSSIPercentage;	
	u8			SignalStrength;				/* in 0-100 index. */
	s8			RxPwr[4];					/* per-path's pwdb */
	s8			RxSNR[4];
#if (RTL8822B_SUPPORT == 1)
	u8			RxCount:2;
	u8			BandWidth:2;
	u8			rxsc:4;
#else
	u8			BandWidth;
#endif
	u8			btCoexPwrAdjust;
#if (RTL8822B_SUPPORT == 1)
	u8			channel;						/* channel number---*/
	BOOLEAN		bMuPacket;					/* is MU packet or not---*/
	BOOLEAN		bBeamformed;
#endif
};

struct rx_raw_rssi
{
	u8 data_rate;
	u8 pwdball;
	s8 pwr_all;
	
	u8 mimo_signal_strength[4];/* in 0~100 index */
	u8 mimo_signal_quality[4];
	
	s8 ofdm_pwr[4];
	u8 ofdm_snr[4];
};


struct rx_pkt_attrib	{
	u16	pkt_len;
	u8	physt;
	u8	drvinfo_sz;
	u8	shift_sz;
	u8	hdrlen; //the WLAN Header Len
	u8 	to_fr_ds;
	u8 	amsdu;
	u8	qos;
	u8	priority;
	u8	pw_save;
	u8	mdata;
	u16	seq_num;
	u8	frag_num;
	u8	mfrag;
	u8	order;
	u8	privacy; //in frame_ctrl field
	u8	bdecrypted;
	u8	encrypt; //when 0 indicate no encrypt. when non-zero, indicate the encrypt algorith
	u8	iv_len;
	u8	icv_len;
	u8	crc_err;
	u8	icv_err;

	u16	eth_type;

	u8 	dst[ETH_ALEN];
	u8 	src[ETH_ALEN];
	u8 	ta[ETH_ALEN];
	u8 	ra[ETH_ALEN];
	u8 	bssid[ETH_ALEN];
	
	u8	ack_policy;
	
//#ifdef CONFIG_TCP_CSUM_OFFLOAD_RX
	u8	tcpchk_valid; // 0: invalid, 1: valid
	u8	ip_chkrpt; //0: incorrect, 1: correct
	u8	tcp_chkrpt; //0: incorrect, 1: correct
//#endif
	u8 	key_index;

	u8	data_rate;
	u8	bw;
	u8	stbc;
	u8	ldpc;
	u8 	sgi;
	u8 	pkt_rpt_type;
	u32 tsfl;
	u32	MacIDValidEntry[2];	// 64 bits present 64 entry.

/*
	u8	signal_qual;
	s8	rx_mimo_signal_qual[2];
	u8	signal_strength;
	u32	RxPWDBAll;	
	s32	RecvSignalPower;
*/
	struct phy_info phy_info;
};


//These definition is used for Rx packet reordering.
#define SN_LESS(a, b)		(((a-b)&0x800)!=0)
#define SN_EQUAL(a, b)	(a == b)
//#define REORDER_WIN_SIZE	128
//#define REORDER_ENTRY_NUM	128
#define REORDER_WAIT_TIME	(50) // (ms)

#define RECVBUFF_ALIGN_SZ 8

#if defined(CONFIG_RTL8192E) || defined(CONFIG_RTL8814A)
	#ifdef CONFIG_PCI_HCI
		#define RXDESC_SIZE 16
		#define RX_WIFI_INFO_SIZE	24
	#else
		#define RXDESC_SIZE	24
	#endif
#else
#define RXDESC_SIZE	24
#endif
#define RXDESC_OFFSET RXDESC_SIZE

struct recv_stat
{
	unsigned int rxdw0;

	unsigned int rxdw1;

#if !((defined(CONFIG_RTL8192E) || defined(CONFIG_RTL8814A)) && defined(CONFIG_PCI_HCI))  /* exclude 8192ee, 8814ae */
	unsigned int rxdw2;

	unsigned int rxdw3;
#endif

#ifndef BUF_DESC_ARCH
	unsigned int rxdw4;

	unsigned int rxdw5;

#ifdef CONFIG_PCI_HCI
	unsigned int rxdw6;

	unsigned int rxdw7;
#endif
#endif //if BUF_DESC_ARCH is defined, rx_buf_desc occupy 4 double words
};

#define EOR BIT(30)

#ifdef CONFIG_PCI_HCI
#define PCI_MAX_RX_QUEUE		1// MSDU packet queue, Rx Command Queue
#define PCI_MAX_RX_COUNT		128

struct rtw_rx_ring {
	struct recv_stat	*desc;
	dma_addr_t		dma;
	unsigned int		idx;
	struct sk_buff	*rx_buf[PCI_MAX_RX_COUNT];
};
#endif



/*
accesser of recv_priv: rtw_recv_entry(dispatch / passive level); recv_thread(passive) ; returnpkt(dispatch)
; halt(passive) ;

using enter_critical section to protect
*/
struct recv_priv
{
	_lock	lock;

#ifdef CONFIG_RECV_THREAD_MODE
	_sema	recv_sema;
	_sema	terminate_recvthread_sema;
#endif

	//_queue	blk_strms[MAX_RX_NUMBLKS];    // keeping the block ack frame until return ack
	_queue	free_recv_queue;
	_queue	recv_pending_queue;
	_queue	uc_swdec_pending_queue;


	u8 *pallocated_frame_buf;
	u8 *precv_frame_buf;

	uint free_recvframe_cnt;

	_adapter	*adapter;

#ifdef PLATFORM_WINDOWS
	_nic_hdl  RxPktPoolHdl;
	_nic_hdl  RxBufPoolHdl;

#ifdef PLATFORM_OS_XP
	PMDL	pbytecnt_mdl;
#endif
	uint	counter; //record the number that up-layer will return to drv; only when counter==0 can we  release recv_priv
	NDIS_EVENT 	recv_resource_evt ;
#endif

	u32	bIsAnyNonBEPkts;
	u64	rx_bytes;
	u64	rx_pkts;
	u64	rx_drop;

	uint  rx_icv_err;
	uint  rx_largepacket_crcerr;
	uint  rx_smallpacket_crcerr;
	uint  rx_middlepacket_crcerr;

#ifdef CONFIG_USB_HCI
	//u8 *pallocated_urb_buf;
	_sema allrxreturnevt;
	uint	ff_hwaddr;
	ATOMIC_T	rx_pending_cnt;

#ifdef CONFIG_USB_INTERRUPT_IN_PIPE
#ifdef PLATFORM_LINUX
	PURB	int_in_urb;
#endif

	u8	*int_in_buf;
#endif //CONFIG_USB_INTERRUPT_IN_PIPE

#endif
#if defined(PLATFORM_LINUX) || defined(PLATFORM_FREEBSD)
#ifdef PLATFORM_FREEBSD
	struct task irq_prepare_beacon_tasklet;
	struct task recv_tasklet;
#else //PLATFORM_FREEBSD
	struct tasklet_struct irq_prepare_beacon_tasklet;
	struct tasklet_struct recv_tasklet;
#endif //PLATFORM_FREEBSD
	struct sk_buff_head free_recv_skb_queue;
	struct sk_buff_head rx_skb_queue;
#ifdef CONFIG_RX_INDICATE_QUEUE
	struct task rx_indicate_tasklet;
	struct ifqueue rx_indicate_queue;
#endif	// CONFIG_RX_INDICATE_QUEUE

#endif //defined(PLATFORM_LINUX) || defined(PLATFORM_FREEBSD)

	u8 *pallocated_recv_buf;
	u8 *precv_buf;    // 4 alignment
	_queue	free_recv_buf_queue;
	u32	free_recv_buf_queue_cnt;

#if defined(CONFIG_SDIO_HCI) || defined(CONFIG_GSPI_HCI) || defined(CONFIG_USB_HCI) 
	_queue	recv_buf_pending_queue;
#endif

#ifdef CONFIG_PCI_HCI
	// Rx
	struct rtw_rx_ring	rx_ring[PCI_MAX_RX_QUEUE];
	int 	rxringcount;
	u16	rxbuffersize;
#endif

	//For display the phy informatiom
	u8 is_signal_dbg;	// for debug
	u8 signal_strength_dbg;	// for debug
	
	u8 signal_strength;
	u8 signal_qual;
	s8 rssi;	//translate_percentage_to_dbm(ptarget_wlan->network.PhyInfo.SignalStrength);
	struct rx_raw_rssi raw_rssi_info;
	//s8 rxpwdb;	
	s16 noise;	
	//int RxSNRdB[2];
	//s8 RxRssi[2];
	//int FalseAlmCnt_all;
	

#ifdef CONFIG_NEW_SIGNAL_STAT_PROCESS
	_timer signal_stat_timer;
	u32 signal_stat_sampling_interval;
	//u32 signal_stat_converging_constant;
	struct signal_stat signal_qual_data;
	struct signal_stat signal_strength_data;
#else //CONFIG_NEW_SIGNAL_STAT_PROCESS
	struct smooth_rssi_data signal_qual_data;
	struct smooth_rssi_data signal_strength_data;
#endif //CONFIG_NEW_SIGNAL_STAT_PROCESS
	u16 sink_udpport,pre_rtp_rxseq,cur_rtp_rxseq;

	BOOLEAN store_law_data_flag;
};

#ifdef CONFIG_NEW_SIGNAL_STAT_PROCESS
#define rtw_set_signal_stat_timer(recvpriv) _set_timer(&(recvpriv)->signal_stat_timer, (recvpriv)->signal_stat_sampling_interval)
#endif //CONFIG_NEW_SIGNAL_STAT_PROCESS

struct sta_recv_priv {

	_lock	lock;
	sint	option;

	//_queue	blk_strms[MAX_RX_NUMBLKS];
	_queue defrag_q;	 //keeping the fragment frame until defrag

	struct	stainfo_rxcache rxcache;

	//uint	sta_rx_bytes;
	//uint	sta_rx_pkts;
	//uint	sta_rx_fail;

};


struct recv_buf
{
	_list list;

	_lock recvbuf_lock;

	u32	ref_cnt;

	PADAPTER adapter;

	u8	*pbuf;
	u8	*pallocated_buf;

	u32	len;
	u8	*phead;
	u8	*pdata;
	u8	*ptail;
	u8	*pend;

#ifdef CONFIG_USB_HCI

	#if defined(PLATFORM_OS_XP)||defined(PLATFORM_LINUX)||defined(PLATFORM_FREEBSD)
	PURB	purb;
	dma_addr_t dma_transfer_addr;	/* (in) dma addr for transfer_buffer */
	u32 alloc_sz;
	#endif

	#ifdef PLATFORM_OS_XP
	PIRP		pirp;
	#endif

	#ifdef PLATFORM_OS_CE
	USB_TRANSFER	usb_transfer_read_port;
	#endif

	u8  irp_pending;
	int  transfer_len;

#endif

#ifdef PLATFORM_LINUX
	_pkt	*pskb;
#endif
#ifdef PLATFORM_FREEBSD //skb solution
	struct sk_buff *pskb;
#endif //PLATFORM_FREEBSD //skb solution
};


/*
	head  ----->

		data  ----->

			payload

		tail  ----->


	end   ----->

	len = (unsigned int )(tail - data);

*/
struct recv_frame_hdr
{
	_list	list;
#ifndef CONFIG_BSD_RX_USE_MBUF
	struct sk_buff	 *pkt;
	struct sk_buff	 *pkt_newalloc;
#else // CONFIG_BSD_RX_USE_MBUF
	_pkt	*pkt;
	_pkt *pkt_newalloc;
#endif // CONFIG_BSD_RX_USE_MBUF

	_adapter  *adapter;

	u8 fragcnt;

	int frame_tag;

	struct rx_pkt_attrib attrib;

	uint  len;
	u8 *rx_head;
	u8 *rx_data;
	u8 *rx_tail;
	u8 *rx_end;

	void *precvbuf;


	//
	struct sta_info *psta;

	//for A-MPDU Rx reordering buffer control
	struct recv_reorder_ctrl *preorder_ctrl;

#ifdef CONFIG_WAPI_SUPPORT
	u8 UserPriority;
	u8 WapiTempPN[16];
	u8 WapiSrcAddr[6];
	u8 bWapiCheckPNInDecrypt;
	u8 bIsWaiPacket;
#endif

};


union recv_frame{

	union{
		_list list;
		struct recv_frame_hdr hdr;
		uint mem[RECVFRAME_HDR_ALIGN>>2];
	}u;

	//uint mem[MAX_RXSZ>>2];

};

bool rtw_rframe_del_wfd_ie(union recv_frame *rframe, u8 ies_offset);

typedef enum _RX_PACKET_TYPE{
	NORMAL_RX,//Normal rx packet
	TX_REPORT1,//CCX
	TX_REPORT2,//TX RPT
	HIS_REPORT,// USB HISR RPT
	C2H_PACKET
}RX_PACKET_TYPE, *PRX_PACKET_TYPE;

extern union recv_frame *_rtw_alloc_recvframe (_queue *pfree_recv_queue);  //get a free recv_frame from pfree_recv_queue
extern union recv_frame *rtw_alloc_recvframe (_queue *pfree_recv_queue);  //get a free recv_frame from pfree_recv_queue
extern void rtw_init_recvframe(union recv_frame *precvframe ,struct recv_priv *precvpriv);
extern int	 rtw_free_recvframe(union recv_frame *precvframe, _queue *pfree_recv_queue);

#define rtw_dequeue_recvframe(queue) rtw_alloc_recvframe(queue)
extern int _rtw_enqueue_recvframe(union recv_frame *precvframe, _queue *queue);
extern int rtw_enqueue_recvframe(union recv_frame *precvframe, _queue *queue);

extern void rtw_free_recvframe_queue(_queue *pframequeue,  _queue *pfree_recv_queue);
u32 rtw_free_uc_swdec_pending_queue(_adapter *adapter);

sint rtw_enqueue_recvbuf_to_head(struct recv_buf *precvbuf, _queue *queue);
sint rtw_enqueue_recvbuf(struct recv_buf *precvbuf, _queue *queue);
struct recv_buf *rtw_dequeue_recvbuf (_queue *queue);

void rtw_reordering_ctrl_timeout_handler(void *pcontext);

void rx_query_phy_status(union recv_frame *rframe, u8 *phy_stat);
int rtw_inc_and_chk_continual_no_rx_packet(struct sta_info *sta, int tid_index);
void rtw_reset_continual_no_rx_packet(struct sta_info *sta, int tid_index);

__inline static u8 *get_rxmem(union recv_frame *precvframe)
{
	//always return rx_head...
	if(precvframe==NULL)
		return NULL;

	return precvframe->u.hdr.rx_head;
}

__inline static u8 *get_rx_status(union recv_frame *precvframe)
{

	return get_rxmem(precvframe);

}

__inline static u8 *get_recvframe_data(union recv_frame *precvframe)
{

	//alwasy return rx_data
	if(precvframe==NULL)
		return NULL;

	return precvframe->u.hdr.rx_data;

}

__inline static u8 *recvframe_push(union recv_frame *precvframe, sint sz)
{
	// append data before rx_data

	/* add data to the start of recv_frame
 *
 *      This function extends the used data area of the recv_frame at the buffer
 *      start. rx_data must be still larger than rx_head, after pushing.
 */

	if(precvframe==NULL)
		return NULL;


	precvframe->u.hdr.rx_data -= sz ;
	if( precvframe->u.hdr.rx_data < precvframe->u.hdr.rx_head )
	{
		precvframe->u.hdr.rx_data += sz ;
		return NULL;
	}

	precvframe->u.hdr.len +=sz;

	return precvframe->u.hdr.rx_data;

}


__inline static u8 *recvframe_pull(union recv_frame *precvframe, sint sz)
{
	// rx_data += sz; move rx_data sz bytes  hereafter

	//used for extract sz bytes from rx_data, update rx_data and return the updated rx_data to the caller


	if(precvframe==NULL)
		return NULL;


	precvframe->u.hdr.rx_data += sz;

	if(precvframe->u.hdr.rx_data > precvframe->u.hdr.rx_tail)
	{
		precvframe->u.hdr.rx_data -= sz;
		return NULL;
	}

	precvframe->u.hdr.len -=sz;

	return precvframe->u.hdr.rx_data;

}

__inline static u8 *recvframe_put(union recv_frame *precvframe, sint sz)
{
	// rx_tai += sz; move rx_tail sz bytes  hereafter

	//used for append sz bytes from ptr to rx_tail, update rx_tail and return the updated rx_tail to the caller
	//after putting, rx_tail must be still larger than rx_end.
 	unsigned char * prev_rx_tail;

	/* DBG_871X("recvframe_put: len=%d\n", sz); */

	if(precvframe==NULL)
		return NULL;

	prev_rx_tail = precvframe->u.hdr.rx_tail;

	precvframe->u.hdr.rx_tail += sz;

	if(precvframe->u.hdr.rx_tail > precvframe->u.hdr.rx_end)
	{
		precvframe->u.hdr.rx_tail -= sz;
		return NULL;
	}

	precvframe->u.hdr.len +=sz;

	return precvframe->u.hdr.rx_tail;

}



__inline static u8 *recvframe_pull_tail(union recv_frame *precvframe, sint sz)
{
	// rmv data from rx_tail (by yitsen)

	//used for extract sz bytes from rx_end, update rx_end and return the updated rx_end to the caller
	//after pulling, rx_end must be still larger than rx_data.

	if(precvframe==NULL)
		return NULL;

	precvframe->u.hdr.rx_tail -= sz;

	if(precvframe->u.hdr.rx_tail < precvframe->u.hdr.rx_data)
	{
		precvframe->u.hdr.rx_tail += sz;
		return NULL;
	}

	precvframe->u.hdr.len -=sz;

	return precvframe->u.hdr.rx_tail;

}



__inline static _buffer * get_rxbuf_desc(union recv_frame *precvframe)
{
	_buffer * buf_desc;

	if(precvframe==NULL)
		return NULL;
#ifdef PLATFORM_WINDOWS
	NdisQueryPacket(precvframe->u.hdr.pkt, NULL, NULL, &buf_desc, NULL);
#endif

	return buf_desc;
}


__inline static union recv_frame *rxmem_to_recvframe(u8 *rxmem)
{
	//due to the design of 2048 bytes alignment of recv_frame, we can reference the union recv_frame
	//from any given member of recv_frame.
	// rxmem indicates the any member/address in recv_frame

	return (union recv_frame*)(((SIZE_PTR)rxmem >> RXFRAME_ALIGN) << RXFRAME_ALIGN);

}

__inline static union recv_frame *pkt_to_recvframe(_pkt *pkt)
{

	u8 * buf_star;
	union recv_frame * precv_frame;
#ifdef PLATFORM_WINDOWS
	_buffer * buf_desc;
	uint len;

	NdisQueryPacket(pkt, NULL, NULL, &buf_desc, &len);
	NdisQueryBufferSafe(buf_desc, &buf_star, &len, HighPagePriority);
#endif
	precv_frame = rxmem_to_recvframe((unsigned char*)buf_star);

	return precv_frame;
}

__inline static u8 *pkt_to_recvmem(_pkt *pkt)
{
	// return the rx_head

	union recv_frame * precv_frame = pkt_to_recvframe(pkt);

	return 	precv_frame->u.hdr.rx_head;

}

__inline static u8 *pkt_to_recvdata(_pkt *pkt)
{
	// return the rx_data

	union recv_frame * precv_frame =pkt_to_recvframe(pkt);

	return 	precv_frame->u.hdr.rx_data;

}


__inline static sint get_recvframe_len(union recv_frame *precvframe)
{
	return precvframe->u.hdr.len;
}


__inline static s32 translate_percentage_to_dbm(u32 SignalStrengthIndex)
{
	s32	SignalPower; // in dBm.

#ifdef CONFIG_SIGNAL_SCALE_MAPPING
	/* Translate to dBm (x=0.5y-95). */
	SignalPower = (s32)((SignalStrengthIndex + 1) >> 1); 
	SignalPower -= 95; 
#else
	/* Translate to dBm (x=y-100) */
	SignalPower = SignalStrengthIndex - 100;
#endif

	return SignalPower;
}


struct sta_info;

extern void _rtw_init_sta_recv_priv(struct sta_recv_priv *psta_recvpriv);

extern void  mgt_dispatcher(_adapter *padapter, union recv_frame *precv_frame);

#endif