/******************************************************************************
 *
 * 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_

#include <drv_conf.h>
#include <osdep_service.h>
#include <drv_types.h>


#define NR_RECVFRAME 256

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

#define MAX_RXFRAME_CNT	512
#define MAX_RX_NUMBLKS		(32)
#define RECVFRAME_HDR_ALIGN 128

#define SNAP_SIZE sizeof(struct ieee80211_snap_hdr)

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
{
	struct adapter	*padapter;
	u8 enable;
	u16 indicate_seq;/* wstart_b, init_value=0xffff */
	u16 wend_b;
	u8 wsize_b;
	struct  __queue pending_recvframe_queue;
	struct timer_list reordering_ctrl_timer;
};

struct	stainfo_rxcache	{
	u16	tid_rxseq[16];
};


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 */
};

#define MAX_PATH_NUM_92CS		2
struct phy_info /* ODM_PHY_INFO_T */
{
	u8		RxPWDBAll;
	u8		SignalQuality;	 /*  in 0-100 index. */
	u8		RxMIMOSignalQuality[MAX_PATH_NUM_92CS]; /* EVM */
	u8		RxMIMOSignalStrength[MAX_PATH_NUM_92CS];/*  in 0~100 index */
	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. */
	u8		RxPwr[MAX_PATH_NUM_92CS];/* per-path's pwdb */
	u8		RxSNR[MAX_PATH_NUM_92CS];/* per-path's SNR */
};


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;

	u8	tcpchk_valid; /*  0: invalid, 1: valid */
	u8	ip_chkrpt; /* 0: incorrect, 1: correct */
	u8	tcp_chkrpt; /* 0: incorrect, 1: correct */
	u8	key_index;

	u8	mcs_rate;
	u8	rxht;
	u8	sgi;
	u8	pkt_rpt_type;
	u32	MacIDValidEntry[2];	/*  64 bits present 64 entry. */

	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

#define RXDESC_SIZE	24
#define RXDESC_OFFSET RXDESC_SIZE

struct recv_stat {
	__le32 rxdw0;
	__le32 rxdw1;
	__le32 rxdw2;
	__le32 rxdw3;
	__le32 rxdw4;
	__le32 rxdw5;
};

#define EOR BIT(30)

/*
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 {
	spinlock_t lock;

	struct  __queue	free_recv_queue;
	struct  __queue	recv_pending_queue;
	struct  __queue	uc_swdec_pending_queue;

	u8 *pallocated_frame_buf;
	u8 *precv_frame_buf;

	uint free_recvframe_cnt;

	struct adapter	*adapter;

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

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

	/* u8 *pallocated_urb_buf; */
	struct  semaphore allrxreturnevt;
	uint	ff_hwaddr;
	u8	rx_pending_cnt;

#ifdef CONFIG_USB_INTERRUPT_IN_PIPE
	struct urb *	int_in_urb;

	u8	*int_in_buf;
#endif /* CONFIG_USB_INTERRUPT_IN_PIPE */

	struct tasklet_struct irq_prepare_beacon_tasklet;
	struct tasklet_struct recv_tasklet;
	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 */

	u8 *pallocated_recv_buf;
	u8 *precv_buf;    /*  4 alignment */
	struct  __queue free_recv_buf_queue;
	u32	free_recv_buf_queue_cnt;

	u8 is_signal_dbg;	/*  for debug */
	u8 signal_strength_dbg;	/*  for debug */
	s8 rssi;
	s8 rxpwdb;
	u8 signal_strength;
	u8 signal_qual;
	u8 noise;
	int RxSNRdB[2];
	s8 RxRssi[2];
	int FalseAlmCnt_all;

	struct timer_list signal_stat_timer;
	u32 signal_stat_sampling_interval;
	struct signal_stat signal_qual_data;
	struct signal_stat signal_strength_data;
};

#define rtw_set_signal_stat_timer(recvpriv) _set_timer(&(recvpriv)->signal_stat_timer, (recvpriv)->signal_stat_sampling_interval)

struct sta_recv_priv {

	spinlock_t lock;
	sint	option;
	struct  __queue defrag_q;	 /* keeping the fragment frame until defrag */
	struct	stainfo_rxcache rxcache;
};

struct recv_buf {
	struct list_head list;
	spinlock_t recvbuf_lock;
	u32	ref_cnt;
	struct adapter *adapter;
	u8	*pbuf;
	u8	*pallocated_buf;
	u32	len;
	u8	*phead;
	u8	*pdata;
	u8	*ptail;
	u8	*pend;

	struct urb *purb;
	dma_addr_t dma_transfer_addr;	/* (in) dma addr for transfer_buffer */
	u32 alloc_sz;

	u8  irp_pending;
	int  transfer_len;

	struct sk_buff	*pskb;
	u8	reuse;
};


/*
	head  ----->

		data  ----->

			payload

		tail  ----->


	end   ----->

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

*/
struct recv_frame_hdr {
	struct list_head list;
	struct sk_buff	 *pkt;
	struct sk_buff	 *pkt_newalloc;
	struct 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;
};

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

extern union recv_frame *_rtw_alloc_recvframe (struct  __queue *pfree_recv_queue);  /* get a free recv_frame from pfree_recv_queue */
extern union recv_frame *rtw_alloc_recvframe (struct  __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, struct  __queue *pfree_recv_queue);

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

extern void rtw_free_recvframe_queue(struct  __queue *pframequeue,  struct  __queue *pfree_recv_queue);
u32 rtw_free_uc_swdec_pending_queue(struct adapter *adapter);

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

void rtw_reordering_ctrl_timeout_handler(void *pcontext);

__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;

	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 unsigned char *get_rxbuf_desc(union recv_frame *precvframe)
{
	unsigned char *buf_desc;

	if (precvframe== NULL)
		return NULL;
	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(struct sk_buff *pkt)
{

	u8 * buf_star;
	union recv_frame * precv_frame;
	precv_frame = rxmem_to_recvframe((unsigned char*)buf_star);

	return precv_frame;
}

__inline static u8 *pkt_to_recvmem(struct sk_buff *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(struct sk_buff *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. */

	/*  Translate to dBm (x=0.5y-95). */
	SignalPower = (s32)((SignalStrengthIndex + 1) >> 1);
	SignalPower -= 95;

	return SignalPower;
}


struct sta_info;

extern void _rtw_init_sta_recv_priv(struct sta_recv_priv *psta_recvpriv);

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

#endif