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
  70         if (pfile->pkt_len == 0) {
  71                 return true;
  72         }
  73
  74
  75         return false;
  76 }
  77
  78 int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz)
  79 {
  80         int i;
  81
  82         pxmitbuf->pallocated_buf = kzalloc(alloc_sz, GFP_KERNEL);
  83         if (pxmitbuf->pallocated_buf == NULL)
  84                 return _FAIL;
  85
  86         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((size_t)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
  87         pxmitbuf->dma_transfer_addr = 0;
  88
  89         for (i = 0; i < 8; i++) {
  90                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  91                 if (pxmitbuf->pxmit_urb[i] == NULL) {
  92                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
  93                         return _FAIL;
  94                 }
  95         }
  96         return _SUCCESS;
  97 }
  98
  99 void rtw_os_xmit_resource_free(struct adapter *padapter,
 100                                struct xmit_buf *pxmitbuf, u32 free_sz)
 101 {
 102         int i;
 103
 104         for (i = 0; i < 8; i++)
 105                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
 106
 107         kfree(pxmitbuf->pallocated_buf);
 108 }
 109
 110 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 111
 112 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
 113 {
 114         u16     queue;
 115         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 116
 117         queue = skb_get_queue_mapping(pkt);
 118         if (padapter->registrypriv.wifi_spec) {
 119                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 120                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 121                         netif_wake_subqueue(padapter->pnetdev, queue);
 122         } else {
 123                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
 124                         netif_wake_subqueue(padapter->pnetdev, queue);
 125         }
 126
 127         dev_kfree_skb_any(pkt);
 128 }
 129
 130 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
 131 {
 132         if (pxframe->pkt)
 133                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 134         pxframe->pkt = NULL;
 135 }
 136
 137 void rtw_os_xmit_schedule(struct adapter *padapter)
 138 {
 139         struct xmit_priv *pxmitpriv;
 140
 141         if (!padapter)
 142                 return;
 143
 144         pxmitpriv = &padapter->xmitpriv;
 145
 146         spin_lock_bh(&pxmitpriv->lock);
 147
 148         if (rtw_txframes_pending(padapter))
 149                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 150
 151         spin_unlock_bh(&pxmitpriv->lock);
 152 }
 153
 154 static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
 155 {
 156         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 157         u16     queue;
 158
 159         queue = skb_get_queue_mapping(pkt);
 160         if (padapter->registrypriv.wifi_spec) {
 161                 /* No free space for Tx, tx_worker is too slow */
 162                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 163                         netif_stop_subqueue(padapter->pnetdev, queue);
 164         } else {
 165                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 166                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 167                                 netif_stop_subqueue(padapter->pnetdev, queue);
 168                 }
 169         }
 170 }
 171
 172 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 173 {
 174         struct  sta_priv *pstapriv = &padapter->stapriv;
 175         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 176         struct list_head *phead, *plist;
 177         struct sk_buff *newskb;
 178         struct sta_info *psta = NULL;
 179         s32     res;
 180
 181         spin_lock_bh(&pstapriv->asoc_list_lock);
 182         phead = &pstapriv->asoc_list;
 183         plist = phead->next;
 184
 185         /* free sta asoc_queue */
 186         while (phead != plist) {
 187                 psta = container_of(plist, struct sta_info, asoc_list);
 188
 189                 plist = plist->next;
 190
 191                 /* avoid   come from STA1 and send back STA1 */
 192                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 193                         continue;
 194
 195                 newskb = skb_copy(skb, GFP_ATOMIC);
 196
 197                 if (newskb) {
 198                         memcpy(newskb->data, psta->hwaddr, 6);
 199                         res = rtw_xmit(padapter, &newskb);
 200                         if (res < 0) {
 201                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
 202                                 pxmitpriv->tx_drop++;
 203                                 dev_kfree_skb_any(newskb);
 204                         } else {
 205                                 pxmitpriv->tx_pkts++;
 206                         }
 207                 } else {
 208                         DBG_88E("%s-%d: skb_copy() failed!\n", __func__, __LINE__);
 209                         pxmitpriv->tx_drop++;
 210
 211                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 212                         return false;   /*  Caller shall tx this multicast frame via normal way. */
 213                 }
 214         }
 215
 216         spin_unlock_bh(&pstapriv->asoc_list_lock);
 217         dev_kfree_skb_any(skb);
 218         return true;
 219 }
 220
 221
 222 int rtw_xmit_entry(struct sk_buff *pkt, struct  net_device *pnetdev)
 223 {
 224         struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
 225         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 226         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 227         s32 res = 0;
 228
 229
 230         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 231
 232         if (rtw_if_up(padapter) == false) {
 233                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 234                 goto drop_packet;
 235         }
 236
 237         rtw_check_xmit_resource(padapter, pkt);
 238
 239         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 240             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 241             (padapter->registrypriv.wifi_spec == 0)) {
 242                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
 243                         res = rtw_mlcst2unicst(padapter, pkt);
 244                         if (res)
 245                                 goto exit;
 246                 }
 247         }
 248
 249         res = rtw_xmit(padapter, &pkt);
 250         if (res < 0)
 251                 goto drop_packet;
 252
 253         pxmitpriv->tx_pkts++;
 254         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 255         goto exit;
 256
 257 drop_packet:
 258         pxmitpriv->tx_drop++;
 259         dev_kfree_skb_any(pkt);
 260         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 261
 262 exit:
 263
 264
 265         return 0;
 266 }