/******************************************************************************
 *
 * 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
 *
 *
 ******************************************************************************/
#define _XMIT_OSDEP_C_

#include <drv_types.h>


uint rtw_remainder_len(struct pkt_file *pfile)
{
	return (pfile->buf_len - ((SIZE_PTR)(pfile->cur_addr) - (SIZE_PTR)(pfile->buf_start)));
}

void _rtw_open_pktfile (_pkt *pktptr, struct pkt_file *pfile)
{
_func_enter_;

	pfile->pkt = pktptr;
	pfile->cur_addr = pfile->buf_start = pktptr->data;
	pfile->pkt_len = pfile->buf_len = pktptr->len;

	pfile->cur_buffer = pfile->buf_start ;
	
_func_exit_;
}

uint _rtw_pktfile_read (struct pkt_file *pfile, u8 *rmem, uint rlen)
{	
	uint	len = 0;
	
_func_enter_;

       len =  rtw_remainder_len(pfile);
      	len = (rlen > len)? len: rlen;

       if(rmem)
	  skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);

       pfile->cur_addr += len;
       pfile->pkt_len -= len;
	   
_func_exit_;	       		

	return len;	
}

sint rtw_endofpktfile(struct pkt_file *pfile)
{
_func_enter_;

	if (pfile->pkt_len == 0) {
_func_exit_;
		return _TRUE;
	}

_func_exit_;

	return _FALSE;
}

void rtw_set_tx_chksum_offload(_pkt *pkt, struct pkt_attrib *pattrib)
{

#ifdef CONFIG_TCP_CSUM_OFFLOAD_TX
	struct sk_buff *skb = (struct sk_buff *)pkt;
	pattrib->hw_tcp_csum = 0;
	
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		if (skb_shinfo(skb)->nr_frags == 0)
		{	
                        const struct iphdr *ip = ip_hdr(skb);
                        if (ip->protocol == IPPROTO_TCP) {
                                // TCP checksum offload by HW
                                DBG_871X("CHECKSUM_PARTIAL TCP\n");
                                pattrib->hw_tcp_csum = 1;
                                //skb_checksum_help(skb);
                        } else if (ip->protocol == IPPROTO_UDP) {
                                //DBG_871X("CHECKSUM_PARTIAL UDP\n");
#if 1                       
                                skb_checksum_help(skb);
#else
                                // Set UDP checksum = 0 to skip checksum check
                                struct udphdr *udp = skb_transport_header(skb);
                                udp->check = 0;
#endif
                        } else {
				DBG_871X("%s-%d TCP CSUM offload Error!!\n", __FUNCTION__, __LINE__);
                                WARN_ON(1);     /* we need a WARN() */
			    }
		}
		else { // IP fragmentation case
			DBG_871X("%s-%d nr_frags != 0, using skb_checksum_help(skb);!!\n", __FUNCTION__, __LINE__);
                	skb_checksum_help(skb);
		}		
	}
#endif	
	
}

int rtw_os_xmit_resource_alloc(_adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz, u8 flag)
{
	if (alloc_sz > 0) {
#ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
		struct dvobj_priv	*pdvobjpriv = adapter_to_dvobj(padapter);
		struct usb_device	*pusbd = pdvobjpriv->pusbdev;

		pxmitbuf->pallocated_buf = rtw_usb_buffer_alloc(pusbd, (size_t)alloc_sz, &pxmitbuf->dma_transfer_addr);
		pxmitbuf->pbuf = pxmitbuf->pallocated_buf;
		if(pxmitbuf->pallocated_buf == NULL)
			return _FAIL;
#else // CONFIG_USE_USB_BUFFER_ALLOC_TX
		
		pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
		if (pxmitbuf->pallocated_buf == NULL)
		{
			return _FAIL;
		}

		pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);

#endif // CONFIG_USE_USB_BUFFER_ALLOC_TX
	}

	if (flag) {
#ifdef CONFIG_USB_HCI
		int i;
		for(i=0; i<8; i++)
	      	{
	      		pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
	             	if(pxmitbuf->pxmit_urb[i] == NULL) 
	             	{
	             		DBG_871X("pxmitbuf->pxmit_urb[i]==NULL");
		        	return _FAIL;	 
	             	}
	      	}
#endif
	}

	return _SUCCESS;	
}

void rtw_os_xmit_resource_free(_adapter *padapter, struct xmit_buf *pxmitbuf,u32 free_sz, u8 flag)
{
	if (flag) {
#ifdef CONFIG_USB_HCI
		int i;

		for(i=0; i<8; i++)
		{
			if(pxmitbuf->pxmit_urb[i])
			{
				//usb_kill_urb(pxmitbuf->pxmit_urb[i]);
				usb_free_urb(pxmitbuf->pxmit_urb[i]);
			}
		}
#endif
	}

	if (free_sz > 0 ) {
#ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
		struct dvobj_priv	*pdvobjpriv = adapter_to_dvobj(padapter);
		struct usb_device	*pusbd = pdvobjpriv->pusbdev;

		rtw_usb_buffer_free(pusbd, (size_t)free_sz, pxmitbuf->pallocated_buf, pxmitbuf->dma_transfer_addr);
		pxmitbuf->pallocated_buf =  NULL;
		pxmitbuf->dma_transfer_addr = 0;
#else	// CONFIG_USE_USB_BUFFER_ALLOC_TX
		if(pxmitbuf->pallocated_buf)
			rtw_mfree(pxmitbuf->pallocated_buf, free_sz);
#endif	// CONFIG_USE_USB_BUFFER_ALLOC_TX
	}
}

#define WMM_XMIT_THRESHOLD	(NR_XMITFRAME*2/5)

void rtw_os_pkt_complete(_adapter *padapter, _pkt *pkt)
{
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
	u16	queue;
	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;

	queue = skb_get_queue_mapping(pkt);
	if (padapter->registrypriv.wifi_spec) {
		if(__netif_subqueue_stopped(padapter->pnetdev, queue) &&
			(pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
		{
			netif_wake_subqueue(padapter->pnetdev, queue);
		}
	} else {
		if(__netif_subqueue_stopped(padapter->pnetdev, queue))
			netif_wake_subqueue(padapter->pnetdev, queue);
	}
#else
	if (netif_queue_stopped(padapter->pnetdev))
		netif_wake_queue(padapter->pnetdev);
#endif

	rtw_skb_free(pkt);
}

void rtw_os_xmit_complete(_adapter *padapter, struct xmit_frame *pxframe)
{
	if(pxframe->pkt)
		rtw_os_pkt_complete(padapter, pxframe->pkt);

	pxframe->pkt = NULL;
}

void rtw_os_xmit_schedule(_adapter *padapter)
{
	_adapter *pri_adapter = padapter;

#if defined(CONFIG_SDIO_HCI) || defined(CONFIG_GSPI_HCI)
	if(!padapter)
		return;

#ifdef CONFIG_CONCURRENT_MODE
	if(padapter->adapter_type > PRIMARY_ADAPTER)
		pri_adapter = padapter->pbuddy_adapter;
#endif

	if (_rtw_queue_empty(&padapter->xmitpriv.pending_xmitbuf_queue) == _FALSE)
		_rtw_up_sema(&pri_adapter->xmitpriv.xmit_sema);


#else
	_irqL  irqL;
	struct xmit_priv *pxmitpriv;

	if(!padapter)
		return;

	pxmitpriv = &padapter->xmitpriv;

	_enter_critical_bh(&pxmitpriv->lock, &irqL);

	if(rtw_txframes_pending(padapter))	
	{
		tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
	}

	_exit_critical_bh(&pxmitpriv->lock, &irqL);
#endif
}

static void rtw_check_xmit_resource(_adapter *padapter, _pkt *pkt)
{
	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
#if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
	u16	queue;

	queue = skb_get_queue_mapping(pkt);
	if (padapter->registrypriv.wifi_spec) {
		/* No free space for Tx, tx_worker is too slow */
		if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD) {
			//DBG_871X("%s(): stop netif_subqueue[%d]\n", __FUNCTION__, queue);
			netif_stop_subqueue(padapter->pnetdev, queue);
		}
	} else {
		if(pxmitpriv->free_xmitframe_cnt<=4) {
			if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
				netif_stop_subqueue(padapter->pnetdev, queue);
		}
	}
#else
	if(pxmitpriv->free_xmitframe_cnt<=4)
	{
		if (!rtw_netif_queue_stopped(padapter->pnetdev))
			rtw_netif_stop_queue(padapter->pnetdev);
	}
#endif
}

#ifdef CONFIG_TX_MCAST2UNI
int rtw_mlcst2unicst(_adapter *padapter, struct sk_buff *skb)
{
	struct	sta_priv *pstapriv = &padapter->stapriv;
	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
	_irqL	irqL;
	_list	*phead, *plist;
	struct sk_buff *newskb;
	struct sta_info *psta = NULL;
	u8 chk_alive_num = 0;
	char chk_alive_list[NUM_STA];
	u8 bc_addr[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
	u8 null_addr[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

	int i;
	s32	res;

	_enter_critical_bh(&pstapriv->asoc_list_lock, &irqL);
	phead = &pstapriv->asoc_list;
	plist = get_next(phead);
	
	//free sta asoc_queue
	while ((rtw_end_of_queue_search(phead, plist)) == _FALSE) {
		int stainfo_offset;
		psta = LIST_CONTAINOR(plist, struct sta_info, asoc_list);
		plist = get_next(plist);

		stainfo_offset = rtw_stainfo_offset(pstapriv, psta);
		if (stainfo_offset_valid(stainfo_offset)) {
			chk_alive_list[chk_alive_num++] = stainfo_offset;
		}
	}
	_exit_critical_bh(&pstapriv->asoc_list_lock, &irqL);

	for (i = 0; i < chk_alive_num; i++) {
		psta = rtw_get_stainfo_by_offset(pstapriv, chk_alive_list[i]);
		if(!(psta->state &_FW_LINKED))
			continue;		
		
		/* avoid come from STA1 and send back STA1 */ 
		if (_rtw_memcmp(psta->hwaddr, &skb->data[6], 6) == _TRUE
			|| _rtw_memcmp(psta->hwaddr, null_addr, 6) == _TRUE
			|| _rtw_memcmp(psta->hwaddr, bc_addr, 6) == _TRUE
		)
			continue;

		newskb = rtw_skb_copy(skb);

		if (newskb) {
			_rtw_memcpy(newskb->data, psta->hwaddr, 6);
			res = rtw_xmit(padapter, &newskb);
			if (res < 0) {
				DBG_871X("%s()-%d: rtw_xmit() return error!\n", __FUNCTION__, __LINE__);
				pxmitpriv->tx_drop++;
				rtw_skb_free(newskb);
			}
		} else {
			DBG_871X("%s-%d: rtw_skb_copy() failed!\n", __FUNCTION__, __LINE__);
			pxmitpriv->tx_drop++;
			//rtw_skb_free(skb);
			return _FALSE;	// Caller shall tx this multicast frame via normal way.
		}
	}

	rtw_skb_free(skb);
	return _TRUE;
}
#endif	// CONFIG_TX_MCAST2UNI


int _rtw_xmit_entry(_pkt *pkt, _nic_hdl pnetdev)
{
	_adapter *padapter = (_adapter *)rtw_netdev_priv(pnetdev);
	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
#ifdef CONFIG_TX_MCAST2UNI
	struct mlme_priv	*pmlmepriv = &padapter->mlmepriv;
	extern int rtw_mc2u_disable;
#endif	// CONFIG_TX_MCAST2UNI	
	s32 res = 0;
#if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
	u16 queue;
#endif

_func_enter_;

	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));

	if (rtw_if_up(padapter) == _FALSE) {
		RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
		#ifdef DBG_TX_DROP_FRAME
		DBG_871X("DBG_TX_DROP_FRAME %s if_up fail\n", __FUNCTION__);
		#endif
		goto drop_packet;
	}

	rtw_check_xmit_resource(padapter, pkt);

#ifdef CONFIG_TX_MCAST2UNI
	if ( !rtw_mc2u_disable
		&& check_fwstate(pmlmepriv, WIFI_AP_STATE) == _TRUE
		&& ( IP_MCAST_MAC(pkt->data)
			|| ICMPV6_MCAST_MAC(pkt->data) )
		&& (padapter->registrypriv.wifi_spec == 0)
		)
	{
		if ( pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4) ) {
			res = rtw_mlcst2unicst(padapter, pkt);
			if (res == _TRUE) {
				goto exit;
			}
		} else {
			//DBG_871X("Stop M2U(%d, %d)! ", pxmitpriv->free_xmitframe_cnt, pxmitpriv->free_xmitbuf_cnt);
			//DBG_871X("!m2u );
		}
	}	
#endif	// CONFIG_TX_MCAST2UNI	

	res = rtw_xmit(padapter, &pkt);
	if (res < 0) {
		#ifdef DBG_TX_DROP_FRAME
		DBG_871X("DBG_TX_DROP_FRAME %s rtw_xmit fail\n", __FUNCTION__);
		#endif
		goto drop_packet;
	}

	RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
	goto exit;

drop_packet:
	pxmitpriv->tx_drop++;
	rtw_skb_free(pkt);
	RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));

exit:

_func_exit_;

	return 0;
}

int rtw_xmit_entry(_pkt *pkt, _nic_hdl pnetdev)
{
	int ret = 0;

	if (pkt) {
		rtw_mstat_update(MSTAT_TYPE_SKB, MSTAT_ALLOC_SUCCESS, pkt->truesize);
		ret = _rtw_xmit_entry(pkt, pnetdev);
	}

	return ret;
}