kernel/drivers/staging/rtl8188eu/os_dep/xmit_linux.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  *
  19  ******************************************************************************/
  20 #define _XMIT_OSDEP_C_
  21
  22 #include <osdep_service.h>
  23 #include <drv_types.h>
  24
  25 #include <wifi.h>
  26 #include <mlme_osdep.h>
  27 #include <xmit_osdep.h>
  28 #include <osdep_intf.h>
  29
  30 uint rtw_remainder_len(struct pkt_file *pfile)
  31 {
  32         return pfile->buf_len - ((size_t)(pfile->cur_addr) -
  33                (size_t)(pfile->buf_start));
  34 }
  35
  36 void _rtw_open_pktfile(struct sk_buff *pktptr, struct pkt_file *pfile)
  37 {
  38
  39         pfile->pkt = pktptr;
  40         pfile->cur_addr = pktptr->data;
  41         pfile->buf_start = pktptr->data;
  42         pfile->pkt_len = pktptr->len;
  43         pfile->buf_len = pktptr->len;
  44
  45         pfile->cur_buffer = pfile->buf_start;
  46
  47 }
  48
  49 uint _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen)
  50 {
  51         uint    len = 0;
  52
  53
  54         len =  rtw_remainder_len(pfile);
  55         len = (rlen > len) ? len : rlen;
  56
  57         if (rmem)
  58                 skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
  59
  60         pfile->cur_addr += len;
  61         pfile->pkt_len -= len;
  62
  63
  64         return len;
  65 }
  66
  67 int rtw_endofpktfile(struct pkt_file *pfile)
  68 {
  69         return pfile->pkt_len == 0;
  70 }
  71
  72 int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz)
  73 {
  74         int i;
  75
  76         pxmitbuf->pallocated_buf = kzalloc(alloc_sz, GFP_KERNEL);
  77         if (pxmitbuf->pallocated_buf == NULL)
  78                 return _FAIL;
  79
  80         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((size_t)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
  81         pxmitbuf->dma_transfer_addr = 0;
  82
  83         for (i = 0; i < 8; i++) {
  84                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  85                 if (pxmitbuf->pxmit_urb[i] == NULL) {
  86                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
  87                         return _FAIL;
  88                 }
  89         }
  90         return _SUCCESS;
  91 }
  92
  93 void rtw_os_xmit_resource_free(struct adapter *padapter,
  94                                struct xmit_buf *pxmitbuf, u32 free_sz)
  95 {
  96         int i;
  97
  98         for (i = 0; i < 8; i++)
  99                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
 100
 101         kfree(pxmitbuf->pallocated_buf);
 102 }
 103
 104 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 105
 106 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
 107 {
 108         u16     queue;
 109         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 110
 111         queue = skb_get_queue_mapping(pkt);
 112         if (padapter->registrypriv.wifi_spec) {
 113                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 114                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 115                         netif_wake_subqueue(padapter->pnetdev, queue);
 116         } else {
 117                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
 118                         netif_wake_subqueue(padapter->pnetdev, queue);
 119         }
 120
 121         dev_kfree_skb_any(pkt);
 122 }
 123
 124 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
 125 {
 126         if (pxframe->pkt)
 127                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 128         pxframe->pkt = NULL;
 129 }
 130
 131 void rtw_os_xmit_schedule(struct adapter *padapter)
 132 {
 133         struct xmit_priv *pxmitpriv;
 134
 135         if (!padapter)
 136                 return;
 137
 138         pxmitpriv = &padapter->xmitpriv;
 139
 140         spin_lock_bh(&pxmitpriv->lock);
 141
 142         if (rtw_txframes_pending(padapter))
 143                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 144
 145         spin_unlock_bh(&pxmitpriv->lock);
 146 }
 147
 148 static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
 149 {
 150         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 151         u16     queue;
 152
 153         queue = skb_get_queue_mapping(pkt);
 154         if (padapter->registrypriv.wifi_spec) {
 155                 /* No free space for Tx, tx_worker is too slow */
 156                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 157                         netif_stop_subqueue(padapter->pnetdev, queue);
 158         } else {
 159                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 160                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 161                                 netif_stop_subqueue(padapter->pnetdev, queue);
 162                 }
 163         }
 164 }
 165
 166 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 167 {
 168         struct  sta_priv *pstapriv = &padapter->stapriv;
 169         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 170         struct list_head *phead, *plist;
 171         struct sk_buff *newskb;
 172         struct sta_info *psta = NULL;
 173         s32     res;
 174
 175         spin_lock_bh(&pstapriv->asoc_list_lock);
 176         phead = &pstapriv->asoc_list;
 177         plist = phead->next;
 178
 179         /* free sta asoc_queue */
 180         while (phead != plist) {
 181                 psta = container_of(plist, struct sta_info, asoc_list);
 182
 183                 plist = plist->next;
 184
 185                 /* avoid   come from STA1 and send back STA1 */
 186                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 187                         continue;
 188
 189                 newskb = skb_copy(skb, GFP_ATOMIC);
 190
 191                 if (newskb) {
 192                         memcpy(newskb->data, psta->hwaddr, 6);
 193                         res = rtw_xmit(padapter, &newskb);
 194                         if (res < 0) {
 195                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
 196                                 pxmitpriv->tx_drop++;
 197                                 dev_kfree_skb_any(newskb);
 198                         } else {
 199                                 pxmitpriv->tx_pkts++;
 200                         }
 201                 } else {
 202                         DBG_88E("%s-%d: skb_copy() failed!\n", __func__, __LINE__);
 203                         pxmitpriv->tx_drop++;
 204
 205                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 206                         return false;   /*  Caller shall tx this multicast frame via normal way. */
 207                 }
 208         }
 209
 210         spin_unlock_bh(&pstapriv->asoc_list_lock);
 211         dev_kfree_skb_any(skb);
 212         return true;
 213 }
 214
 215
 216 int rtw_xmit_entry(struct sk_buff *pkt, struct  net_device *pnetdev)
 217 {
 218         struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
 219         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 220         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 221         s32 res = 0;
 222
 223
 224         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 225
 226         if (rtw_if_up(padapter) == false) {
 227                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 228                 goto drop_packet;
 229         }
 230
 231         rtw_check_xmit_resource(padapter, pkt);
 232
 233         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 234             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 235             (padapter->registrypriv.wifi_spec == 0)) {
 236                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
 237                         res = rtw_mlcst2unicst(padapter, pkt);
 238                         if (res)
 239                                 goto exit;
 240                 }
 241         }
 242
 243         res = rtw_xmit(padapter, &pkt);
 244         if (res < 0)
 245                 goto drop_packet;
 246
 247         pxmitpriv->tx_pkts++;
 248         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 249         goto exit;
 250
 251 drop_packet:
 252         pxmitpriv->tx_drop++;
 253         dev_kfree_skb_any(pkt);
 254         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 255
 256 exit:
 257
 258
 259         return 0;
 260 }