1. 根目录:
2. drivers
3. staging
4. rtl8712
5. xmit_linux.c

/******************************************************************************
 * xmit_linux.c
 *
 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
 * Linux device driver for RTL8192SU
 *
 * 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
 *
 * Modifications for inclusion into the Linux staging tree are
 * Copyright(c) 2010 Larry Finger. All rights reserved.
 *
 * Contact information:
 * WLAN FAE <wlanfae@realtek.com>
 * Larry Finger <Larry.Finger@lwfinger.net>
 *
 ******************************************************************************/

#define _XMIT_OSDEP_C_

#include "osdep_service.h"
#include "drv_types.h"


#include "if_ether.h"
#include "ip.h"
#include "rtl871x_byteorder.h"
#include "wifi.h"
#include "mlme_osdep.h"
#include "xmit_osdep.h"
#include "osdep_intf.h"

static uint remainder_len(struct pkt_file *pfile)
{
	/* Kovich: Need to extend the buf_len to 64 bit ?(unsigned long long) */
	return (uint)(pfile->buf_len - ((addr_t)(pfile->cur_addr) -
	       (addr_t)(pfile->buf_start)));
}

void _r8712_open_pktfile(_pkt *pktptr, struct pkt_file *pfile)
{
	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 ;
}

uint _r8712_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen)
{
	uint len;

	len = 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;
	return len;
}

sint r8712_endofpktfile(struct pkt_file *pfile)
{
	if (pfile->pkt_len == 0)
		return true;
	else
		return false;
}


void r8712_set_qos(struct pkt_file *ppktfile, struct pkt_attrib *pattrib)
{
	int i;
	struct ethhdr etherhdr;
	struct iphdr ip_hdr;
	u16 UserPriority = 0;

	_r8712_open_pktfile(ppktfile->pkt, ppktfile);
	_r8712_pktfile_read(ppktfile, (unsigned char *)&etherhdr, ETH_HLEN);

	/* get UserPriority from IP hdr*/
	if (pattrib->ether_type == 0x0800) {
		i = _r8712_pktfile_read(ppktfile, (u8 *)&ip_hdr,
					sizeof(ip_hdr));
		/*UserPriority = (ntohs(ip_hdr.tos) >> 5) & 0x3 ;*/
		UserPriority = ip_hdr.tos >> 5;
	} else {
		/* "When priority processing of data frames is supported,
		 * a STA's SME should send EAPOL-Key frames at the highest
		 * priority." */

		if (pattrib->ether_type == 0x888e)
			UserPriority = 7;
	}
	pattrib->priority = UserPriority;
	pattrib->hdrlen = WLAN_HDR_A3_QOS_LEN;
	pattrib->subtype = WIFI_QOS_DATA_TYPE;
}

int r8712_xmit_resource_alloc(struct _adapter *padapter,
			      struct xmit_buf *pxmitbuf)
{
	int i;

	for (i = 0; i < 8; i++) {
		pxmitbuf->pxmit_urb[i] = _usb_alloc_urb(0, GFP_KERNEL);
		if (pxmitbuf->pxmit_urb[i] == NULL) {
			printk(KERN_ERR "r8712u: pxmitbuf->pxmit_urb[i]"
			    " == NULL");
			return _FAIL;
		}
	}
	return _SUCCESS;
}

void r8712_xmit_resource_free(struct _adapter *padapter,
			      struct xmit_buf *pxmitbuf)
{
	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]);
		}
	}
}

void r8712_xmit_complete(struct _adapter *padapter, struct xmit_frame *pxframe)
{
	if (pxframe->pkt)
		dev_kfree_skb_any(pxframe->pkt);
	pxframe->pkt = NULL;
}

int r8712_xmit_entry(_pkt *pkt, struct  net_device *pnetdev)
{
	struct xmit_frame *pxmitframe = NULL;
	struct _adapter *padapter = (struct _adapter *)_netdev_priv(pnetdev);
	struct xmit_priv *pxmitpriv = &(padapter->xmitpriv);
	int ret = 0;

	if (r8712_if_up(padapter) == false) {
		ret = 0;
		goto _xmit_entry_drop;
	}
	pxmitframe = r8712_alloc_xmitframe(pxmitpriv);
	if (pxmitframe == NULL) {
		ret = 0;
		goto _xmit_entry_drop;
	}
	if ((!r8712_update_attrib(padapter, pkt, &pxmitframe->attrib))) {
		ret = 0;
		goto _xmit_entry_drop;
	}
	padapter->ledpriv.LedControlHandler(padapter, LED_CTL_TX);
	pxmitframe->pkt = pkt;
	if (r8712_pre_xmit(padapter, pxmitframe) == true) {
		/*dump xmitframe directly or drop xframe*/
		dev_kfree_skb_any(pkt);
		pxmitframe->pkt = NULL;
	}
	pxmitpriv->tx_pkts++;
	pxmitpriv->tx_bytes += pxmitframe->attrib.last_txcmdsz;
	return ret;
_xmit_entry_drop:
	if (pxmitframe)
		r8712_free_xmitframe(pxmitpriv, pxmitframe);
	pxmitpriv->tx_drop++;
	dev_kfree_skb_any(pkt);
	return ret;
}