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 <linux/version.h>
  23 #include <osdep_service.h>
  24 #include <drv_types.h>
  25
  26 #include <wifi.h>
  27 #include <mlme_osdep.h>
  28 #include <xmit_osdep.h>
  29 #include <osdep_intf.h>
  30 #include <usb_osintf.h>
  31
  32 uint rtw_remainder_len(struct pkt_file *pfile)
  33 {
  34         return pfile->buf_len - ((size_t)(pfile->cur_addr) -
  35                (size_t)(pfile->buf_start));
  36 }
  37
  38 void _rtw_open_pktfile(struct sk_buff *pktptr, struct pkt_file *pfile)
  39 {
  40
  41         pfile->pkt = pktptr;
  42         pfile->cur_addr = pktptr->data;
  43         pfile->buf_start = pktptr->data;
  44         pfile->pkt_len = pktptr->len;
  45         pfile->buf_len = pktptr->len;
  46
  47         pfile->cur_buffer = pfile->buf_start;
  48
  49 }
  50
  51 uint _rtw_pktfile_read (struct pkt_file *pfile, u8 *rmem, uint rlen)
  52 {
  53         uint    len = 0;
  54
  55
  56         len =  rtw_remainder_len(pfile);
  57         len = (rlen > len) ? len : rlen;
  58
  59         if (rmem)
  60                 skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
  61
  62         pfile->cur_addr += len;
  63         pfile->pkt_len -= len;
  64
  65
  66         return len;
  67 }
  68
  69 int rtw_endofpktfile(struct pkt_file *pfile)
  70 {
  71
  72         if (pfile->pkt_len == 0) {
  73                 return true;
  74         }
  75
  76
  77         return false;
  78 }
  79
  80 void rtw_set_tx_chksum_offload(struct sk_buff *pkt, struct pkt_attrib *pattrib)
  81 {
  82 }
  83
  84 int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz)
  85 {
  86         int i;
  87
  88         pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
  89         if (pxmitbuf->pallocated_buf == NULL)
  90                 return _FAIL;
  91
  92         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((size_t)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
  93         pxmitbuf->dma_transfer_addr = 0;
  94
  95         for (i = 0; i < 8; i++) {
  96                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  97                 if (pxmitbuf->pxmit_urb[i] == NULL) {
  98                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
  99                         return _FAIL;
 100                 }
 101         }
 102         return _SUCCESS;
 103 }
 104
 105 void rtw_os_xmit_resource_free(struct adapter *padapter,
 106                                struct xmit_buf *pxmitbuf, u32 free_sz)
 107 {
 108         int i;
 109
 110         for (i = 0; i < 8; i++)
 111                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
 112
 113         kfree(pxmitbuf->pallocated_buf);
 114 }
 115
 116 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 117
 118 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
 119 {
 120 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 35))
 121         u16     queue;
 122         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 123
 124         queue = skb_get_queue_mapping(pkt);
 125         if (padapter->registrypriv.wifi_spec) {
 126                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 127                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 128                         netif_wake_subqueue(padapter->pnetdev, queue);
 129         } else {
 130                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
 131                         netif_wake_subqueue(padapter->pnetdev, queue);
 132         }
 133 #else
 134         if (netif_queue_stopped(padapter->pnetdev))
 135                 netif_wake_queue(padapter->pnetdev);
 136 #endif
 137
 138         dev_kfree_skb_any(pkt);
 139 }
 140
 141 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
 142 {
 143         if (pxframe->pkt)
 144                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 145         pxframe->pkt = NULL;
 146 }
 147
 148 void rtw_os_xmit_schedule(struct adapter *padapter)
 149 {
 150         struct xmit_priv *pxmitpriv;
 151
 152         if (!padapter)
 153                 return;
 154
 155         pxmitpriv = &padapter->xmitpriv;
 156
 157         spin_lock_bh(&pxmitpriv->lock);
 158
 159         if (rtw_txframes_pending(padapter))
 160                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 161
 162         spin_unlock_bh(&pxmitpriv->lock);
 163 }
 164
 165 static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
 166 {
 167         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 168         u16     queue;
 169
 170         queue = skb_get_queue_mapping(pkt);
 171         if (padapter->registrypriv.wifi_spec) {
 172                 /* No free space for Tx, tx_worker is too slow */
 173                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 174                         netif_stop_subqueue(padapter->pnetdev, queue);
 175         } else {
 176                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 177                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 178                                 netif_stop_subqueue(padapter->pnetdev, queue);
 179                 }
 180         }
 181 }
 182
 183 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 184 {
 185         struct  sta_priv *pstapriv = &padapter->stapriv;
 186         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 187         struct list_head *phead, *plist;
 188         struct sk_buff *newskb;
 189         struct sta_info *psta = NULL;
 190         s32     res;
 191
 192         spin_lock_bh(&pstapriv->asoc_list_lock);
 193         phead = &pstapriv->asoc_list;
 194         plist = phead->next;
 195
 196         /* free sta asoc_queue */
 197         while (!rtw_end_of_queue_search(phead, plist)) {
 198                 psta = container_of(plist, struct sta_info, asoc_list);
 199
 200                 plist = plist->next;
 201
 202                 /* avoid   come from STA1 and send back STA1 */
 203                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 204                         continue;
 205
 206                 newskb = skb_copy(skb, GFP_ATOMIC);
 207
 208                 if (newskb) {
 209                         memcpy(newskb->data, psta->hwaddr, 6);
 210                         res = rtw_xmit(padapter, &newskb);
 211                         if (res < 0) {
 212                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
 213                                 pxmitpriv->tx_drop++;
 214                                 dev_kfree_skb_any(newskb);
 215                         } else {
 216                                 pxmitpriv->tx_pkts++;
 217                         }
 218                 } else {
 219                         DBG_88E("%s-%d: skb_copy() failed!\n", __func__, __LINE__);
 220                         pxmitpriv->tx_drop++;
 221
 222                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 223                         return false;   /*  Caller shall tx this multicast frame via normal way. */
 224                 }
 225         }
 226
 227         spin_unlock_bh(&pstapriv->asoc_list_lock);
 228         dev_kfree_skb_any(skb);
 229         return true;
 230 }
 231
 232
 233 int rtw_xmit_entry(struct sk_buff *pkt, struct  net_device *pnetdev)
 234 {
 235         struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
 236         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 237         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 238         s32 res = 0;
 239
 240
 241         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 242
 243         if (rtw_if_up(padapter) == false) {
 244                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 245                 goto drop_packet;
 246         }
 247
 248         rtw_check_xmit_resource(padapter, pkt);
 249
 250         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 251             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 252             (padapter->registrypriv.wifi_spec == 0)) {
 253                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
 254                         res = rtw_mlcst2unicst(padapter, pkt);
 255                         if (res)
 256                                 goto exit;
 257                 }
 258         }
 259
 260         res = rtw_xmit(padapter, &pkt);
 261         if (res < 0)
 262                 goto drop_packet;
 263
 264         pxmitpriv->tx_pkts++;
 265         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 266         goto exit;
 267
 268 drop_packet:
 269         pxmitpriv->tx_drop++;
 270         dev_kfree_skb_any(pkt);
 271         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 272
 273 exit:
 274
 275
 276         return 0;
 277 }