drivers/staging/rtl8712/xmit_linux.c

   1 /******************************************************************************
   2  * xmit_linux.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28
  29 #define _XMIT_OSDEP_C_
  30
  31 #include "osdep_service.h"
  32 #include "drv_types.h"
  33
  34
  35 #include "if_ether.h"
  36 #include "ip.h"
  37 #include "rtl871x_byteorder.h"
  38 #include "wifi.h"
  39 #include "mlme_osdep.h"
  40 #include "xmit_osdep.h"
  41 #include "osdep_intf.h"
  42
  43 static uint remainder_len(struct pkt_file *pfile)
  44 {
  45         /* Kovich: Need to extend the buf_len to 64 bit ?(unsigned long long) */
  46         return (uint)(pfile->buf_len - ((addr_t)(pfile->cur_addr) -
  47                (addr_t)(pfile->buf_start)));
  48 }
  49
  50 void _r8712_open_pktfile(_pkt *pktptr, struct pkt_file *pfile)
  51 {
  52         pfile->pkt = pktptr;
  53         pfile->cur_addr = pfile->buf_start = pktptr->data;
  54         pfile->pkt_len = pfile->buf_len = pktptr->len;
  55         pfile->cur_buffer = pfile->buf_start ;
  56 }
  57
  58 uint _r8712_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen)
  59 {
  60         uint len;
  61
  62         len = remainder_len(pfile);
  63         len = (rlen > len) ? len : rlen;
  64         if (rmem)
  65                 skb_copy_bits(pfile->pkt, pfile->buf_len - pfile->pkt_len,
  66                               rmem, len);
  67         pfile->cur_addr += len;
  68         pfile->pkt_len -= len;
  69         return len;
  70 }
  71
  72 sint r8712_endofpktfile(struct pkt_file *pfile)
  73 {
  74         if (pfile->pkt_len == 0)
  75                 return true;
  76         else
  77                 return false;
  78 }
  79
  80
  81 void r8712_set_qos(struct pkt_file *ppktfile, struct pkt_attrib *pattrib)
  82 {
  83         int i;
  84         struct ethhdr etherhdr;
  85         struct iphdr ip_hdr;
  86         u16 UserPriority = 0;
  87
  88         _r8712_open_pktfile(ppktfile->pkt, ppktfile);
  89         _r8712_pktfile_read(ppktfile, (unsigned char *)&etherhdr, ETH_HLEN);
  90
  91         /* get UserPriority from IP hdr*/
  92         if (pattrib->ether_type == 0x0800) {
  93                 i = _r8712_pktfile_read(ppktfile, (u8 *)&ip_hdr,
  94                                         sizeof(ip_hdr));
  95                 /*UserPriority = (ntohs(ip_hdr.tos) >> 5) & 0x3 ;*/
  96                 UserPriority = ip_hdr.tos >> 5;
  97         } else {
  98                 /* "When priority processing of data frames is supported,
  99                  * a STA's SME should send EAPOL-Key frames at the highest
 100                  * priority." */
 101
 102                 if (pattrib->ether_type == 0x888e)
 103                         UserPriority = 7;
 104         }
 105         pattrib->priority = UserPriority;
 106         pattrib->hdrlen = WLAN_HDR_A3_QOS_LEN;
 107         pattrib->subtype = WIFI_QOS_DATA_TYPE;
 108 }
 109
 110 int r8712_xmit_resource_alloc(struct _adapter *padapter,
 111                               struct xmit_buf *pxmitbuf)
 112 {
 113         int i;
 114
 115         for (i = 0; i < 8; i++) {
 116                 pxmitbuf->pxmit_urb[i] = _usb_alloc_urb(0, GFP_KERNEL);
 117                 if (pxmitbuf->pxmit_urb[i] == NULL) {
 118                         printk(KERN_ERR "r8712u: pxmitbuf->pxmit_urb[i]"
 119                             " == NULL");
 120                         return _FAIL;
 121                 }
 122         }
 123         return _SUCCESS;
 124 }
 125
 126 void r8712_xmit_resource_free(struct _adapter *padapter,
 127                               struct xmit_buf *pxmitbuf)
 128 {
 129         int i;
 130
 131         for (i = 0; i < 8; i++) {
 132                 if (pxmitbuf->pxmit_urb[i]) {
 133                         usb_kill_urb(pxmitbuf->pxmit_urb[i]);
 134                         usb_free_urb(pxmitbuf->pxmit_urb[i]);
 135                 }
 136         }
 137 }
 138
 139 void r8712_xmit_complete(struct _adapter *padapter, struct xmit_frame *pxframe)
 140 {
 141         if (pxframe->pkt)
 142                 dev_kfree_skb_any(pxframe->pkt);
 143         pxframe->pkt = NULL;
 144 }
 145
 146 int r8712_xmit_entry(_pkt *pkt, struct  net_device *pnetdev)
 147 {
 148         struct xmit_frame *pxmitframe = NULL;
 149         struct _adapter *padapter = (struct _adapter *)_netdev_priv(pnetdev);
 150         struct xmit_priv *pxmitpriv = &(padapter->xmitpriv);
 151         int ret = 0;
 152
 153         if (r8712_if_up(padapter) == false) {
 154                 ret = 0;
 155                 goto _xmit_entry_drop;
 156         }
 157         pxmitframe = r8712_alloc_xmitframe(pxmitpriv);
 158         if (pxmitframe == NULL) {
 159                 ret = 0;
 160                 goto _xmit_entry_drop;
 161         }
 162         if ((!r8712_update_attrib(padapter, pkt, &pxmitframe->attrib))) {
 163                 ret = 0;
 164                 goto _xmit_entry_drop;
 165         }
 166         padapter->ledpriv.LedControlHandler(padapter, LED_CTL_TX);
 167         pxmitframe->pkt = pkt;
 168         if (r8712_pre_xmit(padapter, pxmitframe) == true) {
 169                 /*dump xmitframe directly or drop xframe*/
 170                 dev_kfree_skb_any(pkt);
 171                 pxmitframe->pkt = NULL;
 172         }
 173         pxmitpriv->tx_pkts++;
 174         pxmitpriv->tx_bytes += pxmitframe->attrib.last_txcmdsz;
 175         return ret;
 176 _xmit_entry_drop:
 177         if (pxmitframe)
 178                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 179         pxmitpriv->tx_drop++;
 180         dev_kfree_skb_any(pkt);
 181         return ret;
 182 }