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 <if_ether.h>
  27 #include <ip.h>
  28 #include <wifi.h>
  29 #include <mlme_osdep.h>
  30 #include <xmit_osdep.h>
  31 #include <osdep_intf.h>
  32 #include <usb_osintf.h>
  33
  34 uint rtw_remainder_len(struct pkt_file *pfile)
  35 {
  36         return pfile->buf_len - ((size_t)(pfile->cur_addr) -
  37                (size_t)(pfile->buf_start));
  38 }
  39
  40 void _rtw_open_pktfile(struct sk_buff *pktptr, struct pkt_file *pfile)
  41 {
  42 _func_enter_;
  43
  44         pfile->pkt = pktptr;
  45         pfile->cur_addr = pktptr->data;
  46         pfile->buf_start = pktptr->data;
  47         pfile->pkt_len = pktptr->len;
  48         pfile->buf_len = pktptr->len;
  49
  50         pfile->cur_buffer = pfile->buf_start;
  51
  52 _func_exit_;
  53 }
  54
  55 uint _rtw_pktfile_read (struct pkt_file *pfile, u8 *rmem, uint rlen)
  56 {
  57         uint    len = 0;
  58
  59 _func_enter_;
  60
  61         len =  rtw_remainder_len(pfile);
  62         len = (rlen > len) ? len : rlen;
  63
  64         if (rmem)
  65                 skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
  66
  67         pfile->cur_addr += len;
  68         pfile->pkt_len -= len;
  69
  70 _func_exit_;
  71
  72         return len;
  73 }
  74
  75 int rtw_endofpktfile(struct pkt_file *pfile)
  76 {
  77 _func_enter_;
  78
  79         if (pfile->pkt_len == 0) {
  80         _func_exit_;
  81                 return true;
  82         }
  83
  84 _func_exit_;
  85
  86         return false;
  87 }
  88
  89 void rtw_set_tx_chksum_offload(struct sk_buff *pkt, struct pkt_attrib *pattrib)
  90 {
  91 }
  92
  93 int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz)
  94 {
  95         int i;
  96
  97         pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
  98         if (pxmitbuf->pallocated_buf == NULL)
  99                 return _FAIL;
 100
 101         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((size_t)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
 102         pxmitbuf->dma_transfer_addr = 0;
 103
 104         for (i = 0; i < 8; i++) {
 105                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
 106                 if (pxmitbuf->pxmit_urb[i] == NULL) {
 107                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
 108                         return _FAIL;
 109                 }
 110         }
 111         return _SUCCESS;
 112 }
 113
 114 void rtw_os_xmit_resource_free(struct adapter *padapter,
 115                                struct xmit_buf *pxmitbuf, u32 free_sz)
 116 {
 117         int i;
 118
 119         for (i = 0; i < 8; i++)
 120                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
 121
 122         kfree(pxmitbuf->pallocated_buf);
 123 }
 124
 125 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 126
 127 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
 128 {
 129 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 35))
 130         u16     queue;
 131         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 132
 133         queue = skb_get_queue_mapping(pkt);
 134         if (padapter->registrypriv.wifi_spec) {
 135                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 136                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 137                         netif_wake_subqueue(padapter->pnetdev, queue);
 138         } else {
 139                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
 140                         netif_wake_subqueue(padapter->pnetdev, queue);
 141         }
 142 #else
 143         if (netif_queue_stopped(padapter->pnetdev))
 144                 netif_wake_queue(padapter->pnetdev);
 145 #endif
 146
 147         dev_kfree_skb_any(pkt);
 148 }
 149
 150 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
 151 {
 152         if (pxframe->pkt)
 153                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 154         pxframe->pkt = NULL;
 155 }
 156
 157 void rtw_os_xmit_schedule(struct adapter *padapter)
 158 {
 159         unsigned long  irql;
 160         struct xmit_priv *pxmitpriv;
 161
 162         if (!padapter)
 163                 return;
 164
 165         pxmitpriv = &padapter->xmitpriv;
 166
 167         _enter_critical_bh(&pxmitpriv->lock, &irql);
 168
 169         if (rtw_txframes_pending(padapter))
 170                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 171
 172         _exit_critical_bh(&pxmitpriv->lock, &irql);
 173 }
 174
 175 static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
 176 {
 177         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 178         u16     queue;
 179
 180         queue = skb_get_queue_mapping(pkt);
 181         if (padapter->registrypriv.wifi_spec) {
 182                 /* No free space for Tx, tx_worker is too slow */
 183                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 184                         netif_stop_subqueue(padapter->pnetdev, queue);
 185         } else {
 186                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 187                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 188                                 netif_stop_subqueue(padapter->pnetdev, queue);
 189                 }
 190         }
 191 }
 192
 193 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 194 {
 195         struct  sta_priv *pstapriv = &padapter->stapriv;
 196         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 197         unsigned long   irql;
 198         struct list_head *phead, *plist;
 199         struct sk_buff *newskb;
 200         struct sta_info *psta = NULL;
 201         s32     res;
 202
 203         _enter_critical_bh(&pstapriv->asoc_list_lock, &irql);
 204         phead = &pstapriv->asoc_list;
 205         plist = get_next(phead);
 206
 207         /* free sta asoc_queue */
 208         while (!rtw_end_of_queue_search(phead, plist)) {
 209                 psta = LIST_CONTAINOR(plist, struct sta_info, asoc_list);
 210
 211                 plist = get_next(plist);
 212
 213                 /* avoid   come from STA1 and send back STA1 */
 214                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 215                         continue;
 216
 217                 newskb = skb_copy(skb, GFP_ATOMIC);
 218
 219                 if (newskb) {
 220                         memcpy(newskb->data, psta->hwaddr, 6);
 221                         res = rtw_xmit(padapter, &newskb);
 222                         if (res < 0) {
 223                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
 224                                 pxmitpriv->tx_drop++;
 225                                 dev_kfree_skb_any(newskb);
 226                         } else {
 227                                 pxmitpriv->tx_pkts++;
 228                         }
 229                 } else {
 230                         DBG_88E("%s-%d: skb_copy() failed!\n", __func__, __LINE__);
 231                         pxmitpriv->tx_drop++;
 232
 233                         _exit_critical_bh(&pstapriv->asoc_list_lock, &irql);
 234                         return false;   /*  Caller shall tx this multicast frame via normal way. */
 235                 }
 236         }
 237
 238         _exit_critical_bh(&pstapriv->asoc_list_lock, &irql);
 239         dev_kfree_skb_any(skb);
 240         return true;
 241 }
 242
 243
 244 int rtw_xmit_entry(struct sk_buff *pkt, struct  net_device *pnetdev)
 245 {
 246         struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
 247         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 248         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 249         s32 res = 0;
 250
 251 _func_enter_;
 252
 253         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 254
 255         if (rtw_if_up(padapter) == false) {
 256                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 257                 goto drop_packet;
 258         }
 259
 260         rtw_check_xmit_resource(padapter, pkt);
 261
 262         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 263             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 264             (padapter->registrypriv.wifi_spec == 0)) {
 265                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
 266                         res = rtw_mlcst2unicst(padapter, pkt);
 267                         if (res)
 268                                 goto exit;
 269                 }
 270         }
 271
 272         res = rtw_xmit(padapter, &pkt);
 273         if (res < 0)
 274                 goto drop_packet;
 275
 276         pxmitpriv->tx_pkts++;
 277         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 278         goto exit;
 279
 280 drop_packet:
 281         pxmitpriv->tx_drop++;
 282         dev_kfree_skb_any(pkt);
 283         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 284
 285 exit:
 286
 287 _func_exit_;
 288
 289         return 0;
 290 }