/******************************************************************************
 * 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 <linux/usb.h>
#include <linux/ip.h>
#include <linux/if_ether.h>

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

#include "wifi.h"
#include "mlme_osdep.h"
#include "xmit_osdep.h"
#include "osdep_intf.h"

static uint remainder_len(struct pkt_file *pfile)
{
        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)
{
        return (pfile->pkt_len == 0);
}


void r8712_set_qos(struct pkt_file *ppktfile, struct pkt_attrib *pattrib)
{
        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) {
                _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;
}

void r8712_SetFilter(struct work_struct *work)
{
        struct _adapter *padapter = container_of(work, struct _adapter,
                                                wkFilterRxFF0);
        u8  oldvalue = 0x00, newvalue = 0x00;
        unsigned long irqL;

        oldvalue = r8712_read8(padapter, 0x117);
        newvalue = oldvalue & 0xfe;
        r8712_write8(padapter, 0x117, newvalue);

        spin_lock_irqsave(&padapter->lockRxFF0Filter, irqL);
        padapter->blnEnableRxFF0Filter = 1;
        spin_unlock_irqrestore(&padapter->lockRxFF0Filter, irqL);
        do {
                msleep(100);
        } while (padapter->blnEnableRxFF0Filter == 1);
        r8712_write8(padapter, 0x117, oldvalue);
}

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]) {
                        netdev_err(padapter->pnetdev, "pxmitbuf->pxmit_urb[i] == NULL\n");
                        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 = netdev_priv(pnetdev);
        struct xmit_priv *pxmitpriv = &(padapter->xmitpriv);

        if (!r8712_if_up(padapter)) {
                goto _xmit_entry_drop;
        }
        pxmitframe = r8712_alloc_xmitframe(pxmitpriv);
        if (!pxmitframe) {
                goto _xmit_entry_drop;
        }
        if ((!r8712_update_attrib(padapter, pkt, &pxmitframe->attrib))) {
                goto _xmit_entry_drop;
        }
        padapter->ledpriv.LedControlHandler(padapter, LED_CTL_TX);
        pxmitframe->pkt = pkt;
        if (r8712_pre_xmit(padapter, pxmitframe)) {
                /*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 0;
_xmit_entry_drop:
        if (pxmitframe)
                r8712_free_xmitframe(pxmitpriv, pxmitframe);
        pxmitpriv->tx_drop++;
        dev_kfree_skb_any(pkt);
        return 0;
}