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  ******************************************************************************/
  15 #define _XMIT_OSDEP_C_
  16
  17 #include <osdep_service.h>
  18 #include <drv_types.h>
  19
  20 #include <wifi.h>
  21 #include <mlme_osdep.h>
  22 #include <xmit_osdep.h>
  23 #include <osdep_intf.h>
  24
  25 uint rtw_remainder_len(struct pkt_file *pfile)
  26 {
  27         return pfile->buf_len - ((size_t)(pfile->cur_addr) -
  28                (size_t)(pfile->buf_start));
  29 }
  30
  31 void _rtw_open_pktfile(struct sk_buff *pktptr, struct pkt_file *pfile)
  32 {
  33
  34         pfile->pkt = pktptr;
  35         pfile->cur_addr = pktptr->data;
  36         pfile->buf_start = pktptr->data;
  37         pfile->pkt_len = pktptr->len;
  38         pfile->buf_len = pktptr->len;
  39
  40         pfile->cur_buffer = pfile->buf_start;
  41
  42 }
  43
  44 uint _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen)
  45 {
  46         uint    len = 0;
  47
  48
  49         len =  rtw_remainder_len(pfile);
  50         len = min(rlen, len);
  51
  52         if (rmem)
  53                 skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
  54
  55         pfile->cur_addr += len;
  56         pfile->pkt_len -= len;
  57
  58
  59         return len;
  60 }
  61
  62 int rtw_endofpktfile(struct pkt_file *pfile)
  63 {
  64         return pfile->pkt_len == 0;
  65 }
  66
  67 int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz)
  68 {
  69         int i;
  70
  71         pxmitbuf->pallocated_buf = kzalloc(alloc_sz, GFP_KERNEL);
  72         if (pxmitbuf->pallocated_buf == NULL)
  73                 return _FAIL;
  74
  75         pxmitbuf->pbuf = PTR_ALIGN(pxmitbuf->pallocated_buf, XMITBUF_ALIGN_SZ);
  76         pxmitbuf->dma_transfer_addr = 0;
  77
  78         for (i = 0; i < 8; i++) {
  79                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  80                 if (pxmitbuf->pxmit_urb[i] == NULL) {
  81                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
  82                         return _FAIL;
  83                 }
  84         }
  85         return _SUCCESS;
  86 }
  87
  88 void rtw_os_xmit_resource_free(struct adapter *padapter,
  89                                struct xmit_buf *pxmitbuf, u32 free_sz)
  90 {
  91         int i;
  92
  93         for (i = 0; i < 8; i++)
  94                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
  95
  96         kfree(pxmitbuf->pallocated_buf);
  97 }
  98
  99 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 100
 101 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
 102 {
 103         u16     queue;
 104         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 105
 106         queue = skb_get_queue_mapping(pkt);
 107         if (padapter->registrypriv.wifi_spec) {
 108                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 109                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 110                         netif_wake_subqueue(padapter->pnetdev, queue);
 111         } else {
 112                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
 113                         netif_wake_subqueue(padapter->pnetdev, queue);
 114         }
 115
 116         dev_kfree_skb_any(pkt);
 117 }
 118
 119 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
 120 {
 121         if (pxframe->pkt)
 122                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 123         pxframe->pkt = NULL;
 124 }
 125
 126 void rtw_os_xmit_schedule(struct adapter *padapter)
 127 {
 128         struct xmit_priv *pxmitpriv;
 129
 130         if (!padapter)
 131                 return;
 132
 133         pxmitpriv = &padapter->xmitpriv;
 134
 135         spin_lock_bh(&pxmitpriv->lock);
 136
 137         if (rtw_txframes_pending(padapter))
 138                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 139
 140         spin_unlock_bh(&pxmitpriv->lock);
 141 }
 142
 143 static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
 144 {
 145         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 146         u16     queue;
 147
 148         queue = skb_get_queue_mapping(pkt);
 149         if (padapter->registrypriv.wifi_spec) {
 150                 /* No free space for Tx, tx_worker is too slow */
 151                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 152                         netif_stop_subqueue(padapter->pnetdev, queue);
 153         } else {
 154                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 155                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 156                                 netif_stop_subqueue(padapter->pnetdev, queue);
 157                 }
 158         }
 159 }
 160
 161 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 162 {
 163         struct  sta_priv *pstapriv = &padapter->stapriv;
 164         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 165         struct list_head *phead, *plist;
 166         struct sk_buff *newskb;
 167         struct sta_info *psta = NULL;
 168         s32     res;
 169
 170         spin_lock_bh(&pstapriv->asoc_list_lock);
 171         phead = &pstapriv->asoc_list;
 172         plist = phead->next;
 173
 174         /* free sta asoc_queue */
 175         while (phead != plist) {
 176                 psta = container_of(plist, struct sta_info, asoc_list);
 177
 178                 plist = plist->next;
 179
 180                 /* avoid   come from STA1 and send back STA1 */
 181                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 182                         continue;
 183
 184                 newskb = skb_copy(skb, GFP_ATOMIC);
 185
 186                 if (newskb) {
 187                         memcpy(newskb->data, psta->hwaddr, 6);
 188                         res = rtw_xmit(padapter, &newskb);
 189                         if (res < 0) {
 190                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
 191                                 pxmitpriv->tx_drop++;
 192                                 dev_kfree_skb_any(newskb);
 193                         } else {
 194                                 pxmitpriv->tx_pkts++;
 195                         }
 196                 } else {
 197                         DBG_88E("%s-%d: skb_copy() failed!\n", __func__, __LINE__);
 198                         pxmitpriv->tx_drop++;
 199
 200                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 201                         return false;   /*  Caller shall tx this multicast frame via normal way. */
 202                 }
 203         }
 204
 205         spin_unlock_bh(&pstapriv->asoc_list_lock);
 206         dev_kfree_skb_any(skb);
 207         return true;
 208 }
 209
 210
 211 int rtw_xmit_entry(struct sk_buff *pkt, struct  net_device *pnetdev)
 212 {
 213         struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
 214         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 215         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 216         s32 res = 0;
 217
 218
 219         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 220
 221         if (rtw_if_up(padapter) == false) {
 222                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 223                 goto drop_packet;
 224         }
 225
 226         rtw_check_xmit_resource(padapter, pkt);
 227
 228         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 229             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 230             (padapter->registrypriv.wifi_spec == 0)) {
 231                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
 232                         res = rtw_mlcst2unicst(padapter, pkt);
 233                         if (res)
 234                                 goto exit;
 235                 }
 236         }
 237
 238         res = rtw_xmit(padapter, &pkt);
 239         if (res < 0)
 240                 goto drop_packet;
 241
 242         pxmitpriv->tx_pkts++;
 243         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 244         goto exit;
 245
 246 drop_packet:
 247         pxmitpriv->tx_drop++;
 248         dev_kfree_skb_any(pkt);
 249         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 250
 251 exit:
 252
 253
 254         return 0;
 255 }