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 <drv_conf.h>
  23 #include <osdep_service.h>
  24 #include <drv_types.h>
  25
  26 #include <linux/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 <circ_buf.h>
  33
  34 uint rtw_remainder_len(struct pkt_file *pfile)
  35 {
  36         return (pfile->buf_len - ((unsigned long)(pfile->cur_addr) - (unsigned long)(pfile->buf_start)));
  37 }
  38
  39 void _rtw_open_pktfile (_pkt *pktptr, struct pkt_file *pfile)
  40 {
  41 _func_enter_;
  42
  43         pfile->pkt = pktptr;
  44         pfile->cur_addr = pfile->buf_start = pktptr->data;
  45         pfile->pkt_len = pfile->buf_len = pktptr->len;
  46
  47         pfile->cur_buffer = pfile->buf_start ;
  48
  49 _func_exit_;
  50 }
  51
  52 uint _rtw_pktfile_read (struct pkt_file *pfile, u8 *rmem, uint rlen)
  53 {
  54         uint    len = 0;
  55
  56 _func_enter_;
  57
  58        len =  rtw_remainder_len(pfile);
  59         len = (rlen > len)? len: rlen;
  60
  61        if(rmem)
  62           skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
  63
  64        pfile->cur_addr += len;
  65        pfile->pkt_len -= len;
  66
  67 _func_exit_;
  68
  69         return len;
  70 }
  71
  72 int rtw_endofpktfile(struct pkt_file *pfile)
  73 {
  74 _func_enter_;
  75
  76         if (pfile->pkt_len == 0) {
  77 _func_exit_;
  78                 return _TRUE;
  79         }
  80
  81 _func_exit_;
  82
  83         return _FALSE;
  84 }
  85
  86 void rtw_set_tx_chksum_offload(_pkt *pkt, struct pkt_attrib *pattrib)
  87 {
  88
  89 #ifdef CONFIG_TCP_CSUM_OFFLOAD_TX
  90         struct sk_buff *skb = (struct sk_buff *)pkt;
  91         pattrib->hw_tcp_csum = 0;
  92
  93         if (skb->ip_summed == CHECKSUM_PARTIAL) {
  94                 if (skb_shinfo(skb)->nr_frags == 0)
  95                 {
  96                         const struct iphdr *ip = ip_hdr(skb);
  97                         if (ip->protocol == IPPROTO_TCP) {
  98                                 // TCP checksum offload by HW
  99                                 DBG_8723A("CHECKSUM_PARTIAL TCP\n");
 100                                 pattrib->hw_tcp_csum = 1;
 101                                 //skb_checksum_help(skb);
 102                         } else if (ip->protocol == IPPROTO_UDP) {
 103                                 //DBG_8723A("CHECKSUM_PARTIAL UDP\n");
 104 #if 1
 105                                 skb_checksum_help(skb);
 106 #else
 107                                 // Set UDP checksum = 0 to skip checksum check
 108                                 struct udphdr *udp = skb_transport_header(skb);
 109                                 udp->check = 0;
 110 #endif
 111                         } else {
 112                                 DBG_8723A("%s-%d TCP CSUM offload Error!!\n", __FUNCTION__, __LINE__);
 113                                 WARN_ON(1);     /* we need a WARN() */
 114                             }
 115                 }
 116                 else { // IP fragmentation case
 117                         DBG_8723A("%s-%d nr_frags != 0, using skb_checksum_help(skb);!!\n", __FUNCTION__, __LINE__);
 118                         skb_checksum_help(skb);
 119                 }
 120         }
 121 #endif
 122
 123 }
 124
 125 int rtw_os_xmit_resource_alloc(_adapter *padapter, struct xmit_buf *pxmitbuf,u32 alloc_sz)
 126 {
 127         int i;
 128         struct dvobj_priv       *pdvobjpriv = adapter_to_dvobj(padapter);
 129         struct usb_device       *pusbd = pdvobjpriv->pusbdev;
 130
 131 #ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
 132         pxmitbuf->pallocated_buf = rtw_usb_buffer_alloc(pusbd, (size_t)alloc_sz, &pxmitbuf->dma_transfer_addr);
 133         pxmitbuf->pbuf = pxmitbuf->pallocated_buf;
 134         if(pxmitbuf->pallocated_buf == NULL)
 135                 return _FAIL;
 136 #else // CONFIG_USE_USB_BUFFER_ALLOC_TX
 137
 138         pxmitbuf->pallocated_buf = kzalloc(alloc_sz, GFP_KERNEL);
 139         if (pxmitbuf->pallocated_buf == NULL) {
 140                 return _FAIL;
 141         }
 142
 143         pxmitbuf->pbuf = PTR_ALIGN(pxmitbuf->pallocated_buf, XMITBUF_ALIGN_SZ);
 144         pxmitbuf->dma_transfer_addr = 0;
 145
 146 #endif // CONFIG_USE_USB_BUFFER_ALLOC_TX
 147
 148         for(i=0; i<8; i++)
 149         {
 150                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
 151                 if(pxmitbuf->pxmit_urb[i] == NULL)
 152                 {
 153                         DBG_8723A("pxmitbuf->pxmit_urb[i]==NULL");
 154                         return _FAIL;
 155                 }
 156
 157         }
 158         return _SUCCESS;
 159 }
 160
 161 void rtw_os_xmit_resource_free(_adapter *padapter, struct xmit_buf *pxmitbuf,u32 free_sz)
 162 {
 163         int i;
 164         struct dvobj_priv       *pdvobjpriv = adapter_to_dvobj(padapter);
 165         struct usb_device       *pusbd = pdvobjpriv->pusbdev;
 166
 167         for(i=0; i<8; i++)
 168         {
 169                 if(pxmitbuf->pxmit_urb[i])
 170                 {
 171                         //usb_kill_urb(pxmitbuf->pxmit_urb[i]);
 172                         usb_free_urb(pxmitbuf->pxmit_urb[i]);
 173                 }
 174         }
 175
 176 #ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
 177         rtw_usb_buffer_free(pusbd, (size_t)free_sz, pxmitbuf->pallocated_buf, pxmitbuf->dma_transfer_addr);
 178         pxmitbuf->pallocated_buf =  NULL;
 179         pxmitbuf->dma_transfer_addr = 0;
 180 #else   // CONFIG_USE_USB_BUFFER_ALLOC_TX
 181         if(pxmitbuf->pallocated_buf)
 182                 kfree(pxmitbuf->pallocated_buf);
 183 #endif  // CONFIG_USE_USB_BUFFER_ALLOC_TX
 184
 185 }
 186
 187 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 188
 189 void rtw_os_pkt_complete(_adapter *padapter, _pkt *pkt)
 190 {
 191 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 192         u16     queue;
 193         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 194
 195         queue = skb_get_queue_mapping(pkt);
 196         if (padapter->registrypriv.wifi_spec) {
 197                 if(__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 198                         (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 199                 {
 200                         netif_wake_subqueue(padapter->pnetdev, queue);
 201                 }
 202         } else {
 203                 if(__netif_subqueue_stopped(padapter->pnetdev, queue))
 204                         netif_wake_subqueue(padapter->pnetdev, queue);
 205         }
 206 #else
 207         if (netif_queue_stopped(padapter->pnetdev))
 208                 netif_wake_queue(padapter->pnetdev);
 209 #endif
 210
 211         dev_kfree_skb_any(pkt);
 212 }
 213
 214 void rtw_os_xmit_complete(_adapter *padapter, struct xmit_frame *pxframe)
 215 {
 216         if(pxframe->pkt)
 217         {
 218                 //RT_TRACE(_module_xmit_osdep_c_,_drv_err_,("linux : rtw_os_xmit_complete, dev_kfree_skb()\n"));
 219
 220                 //dev_kfree_skb_any(pxframe->pkt);
 221                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 222
 223         }
 224
 225         pxframe->pkt = NULL;
 226 }
 227
 228 void rtw_os_xmit_schedule(_adapter *padapter)
 229 {
 230         _adapter *pri_adapter = padapter;
 231         _irqL  irqL;
 232         struct xmit_priv *pxmitpriv;
 233
 234         if(!padapter)
 235                 return;
 236
 237         pxmitpriv = &padapter->xmitpriv;
 238
 239         spin_lock_bh(&pxmitpriv->lock);
 240
 241         if(rtw_txframes_pending(padapter))
 242         {
 243                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 244         }
 245
 246         spin_unlock_bh(&pxmitpriv->lock);
 247 }
 248
 249 static void rtw_check_xmit_resource(_adapter *padapter, _pkt *pkt)
 250 {
 251         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 252 #if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
 253         u16     queue;
 254
 255         queue = skb_get_queue_mapping(pkt);
 256         if (padapter->registrypriv.wifi_spec) {
 257                 /* No free space for Tx, tx_worker is too slow */
 258                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD) {
 259                         //DBG_8723A("%s(): stop netif_subqueue[%d]\n", __FUNCTION__, queue);
 260                         netif_stop_subqueue(padapter->pnetdev, queue);
 261                 }
 262         } else {
 263                 if(pxmitpriv->free_xmitframe_cnt<=4) {
 264                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 265                                 netif_stop_subqueue(padapter->pnetdev, queue);
 266                 }
 267         }
 268 #else
 269         if(pxmitpriv->free_xmitframe_cnt<=4)
 270         {
 271                 if (!rtw_netif_queue_stopped(padapter->pnetdev))
 272                         rtw_netif_stop_queue(padapter->pnetdev);
 273         }
 274 #endif
 275 }
 276
 277 #ifdef CONFIG_TX_MCAST2UNI
 278 int rtw_mlcst2unicst(_adapter *padapter, struct sk_buff *skb)
 279 {
 280         struct  sta_priv *pstapriv = &padapter->stapriv;
 281         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 282         _irqL   irqL;
 283         _list   *phead, *plist;
 284         struct sk_buff *newskb;
 285         struct sta_info *psta = NULL;
 286         u8 chk_alive_num = 0;
 287         char chk_alive_list[NUM_STA];
 288         u8 bc_addr[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 289         u8 null_addr[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
 290
 291         int i;
 292         s32     res;
 293
 294         spin_lock_bh(&pstapriv->asoc_list_lock);
 295         phead = &pstapriv->asoc_list;
 296         plist = get_next(phead);
 297
 298         //free sta asoc_queue
 299         while ((rtw_end_of_queue_search(phead, plist)) == _FALSE) {
 300                 int stainfo_offset;
 301                 psta = LIST_CONTAINOR(plist, struct sta_info, asoc_list);
 302                 plist = get_next(plist);
 303
 304                 stainfo_offset = rtw_stainfo_offset(pstapriv, psta);
 305                 if (stainfo_offset_valid(stainfo_offset)) {
 306                         chk_alive_list[chk_alive_num++] = stainfo_offset;
 307                 }
 308         }
 309         spin_unlock_bh(&pstapriv->asoc_list_lock);
 310
 311         for (i = 0; i < chk_alive_num; i++) {
 312                 psta = rtw_get_stainfo_by_offset(pstapriv, chk_alive_list[i]);
 313                 if(!(psta->state &_FW_LINKED))
 314                         continue;
 315
 316                 /* avoid come from STA1 and send back STA1 */
 317                 if (!memcmp(psta->hwaddr, &skb->data[6], 6) ||
 318                     !memcmp(psta->hwaddr, null_addr, 6) ||
 319                     !memcmp(psta->hwaddr, bc_addr, 6))
 320                         continue;
 321
 322                 newskb = skb_copy(skb, GFP_ATOMIC);
 323
 324                 if (newskb) {
 325                         memcpy(newskb->data, psta->hwaddr, 6);
 326                         res = rtw_xmit(padapter, &newskb);
 327                         if (res < 0) {
 328                                 DBG_8723A("%s()-%d: rtw_xmit() return error!\n", __FUNCTION__, __LINE__);
 329                                 pxmitpriv->tx_drop++;
 330                                 dev_kfree_skb_any(newskb);
 331                         } else
 332                                 pxmitpriv->tx_pkts++;
 333                 } else {
 334                         DBG_8723A("%s-%d: skb_copy() failed!\n", __FUNCTION__, __LINE__);
 335                         pxmitpriv->tx_drop++;
 336                         //dev_kfree_skb_any(skb);
 337                         return _FALSE;  // Caller shall tx this multicast frame via normal way.
 338                 }
 339         }
 340
 341         dev_kfree_skb_any(skb);
 342         return _TRUE;
 343 }
 344 #endif  // CONFIG_TX_MCAST2UNI
 345
 346
 347 int rtw_xmit_entry(_pkt *pkt, _nic_hdl pnetdev)
 348 {
 349         _adapter *padapter = (_adapter *)rtw_netdev_priv(pnetdev);
 350         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 351 #ifdef CONFIG_TX_MCAST2UNI
 352         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 353         extern int rtw_mc2u_disable;
 354 #endif  // CONFIG_TX_MCAST2UNI
 355         s32 res = 0;
 356 #if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
 357         u16 queue;
 358 #endif
 359
 360 _func_enter_;
 361
 362         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 363
 364         if (rtw_if_up(padapter) == _FALSE) {
 365                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 366                 #ifdef DBG_TX_DROP_FRAME
 367                 DBG_8723A("DBG_TX_DROP_FRAME %s if_up fail\n", __FUNCTION__);
 368                 #endif
 369                 goto drop_packet;
 370         }
 371
 372         rtw_check_xmit_resource(padapter, pkt);
 373
 374 #ifdef CONFIG_TX_MCAST2UNI
 375         if ( !rtw_mc2u_disable
 376                 && check_fwstate(pmlmepriv, WIFI_AP_STATE) == _TRUE
 377                 && ( IP_MCAST_MAC(pkt->data)
 378                         || ICMPV6_MCAST_MAC(pkt->data) )
 379                 && (padapter->registrypriv.wifi_spec == 0)
 380                 )
 381         {
 382                 if ( pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4) ) {
 383                         res = rtw_mlcst2unicst(padapter, pkt);
 384                         if (res == _TRUE) {
 385                                 goto exit;
 386                         }
 387                 } else {
 388                         //DBG_8723A("Stop M2U(%d, %d)! ", pxmitpriv->free_xmitframe_cnt, pxmitpriv->free_xmitbuf_cnt);
 389                         //DBG_8723A("!m2u );
 390                 }
 391         }
 392 #endif  // CONFIG_TX_MCAST2UNI
 393
 394         res = rtw_xmit(padapter, &pkt);
 395         if (res < 0) {
 396                 #ifdef DBG_TX_DROP_FRAME
 397                 DBG_8723A("DBG_TX_DROP_FRAME %s rtw_xmit fail\n", __FUNCTION__);
 398                 #endif
 399                 goto drop_packet;
 400         }
 401
 402         pxmitpriv->tx_pkts++;
 403         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 404         goto exit;
 405
 406 drop_packet:
 407         pxmitpriv->tx_drop++;
 408         dev_kfree_skb_any(pkt);
 409         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 410
 411 exit:
 412
 413 _func_exit_;
 414
 415         return 0;
 416 }