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 <if_ether.h>
  27 #include <ip.h>
  28 #include <rtw_byteorder.h>
  29 #include <wifi.h>
  30 #include <mlme_osdep.h>
  31 #include <xmit_osdep.h>
  32 #include <osdep_intf.h>
  33 #include <circ_buf.h>
  34
  35 uint rtw_remainder_len(struct pkt_file *pfile)
  36 {
  37         return (pfile->buf_len - ((SIZE_PTR)(pfile->cur_addr) - (SIZE_PTR)(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 = pfile->buf_start = pktptr->data;
  46         pfile->pkt_len = pfile->buf_len = pktptr->len;
  47
  48         pfile->cur_buffer = pfile->buf_start ;
  49
  50 _func_exit_;
  51 }
  52
  53 uint _rtw_pktfile_read (struct pkt_file *pfile, u8 *rmem, uint rlen)
  54 {
  55         uint    len = 0;
  56
  57 _func_enter_;
  58
  59        len =  rtw_remainder_len(pfile);
  60         len = (rlen > len)? len: rlen;
  61
  62        if(rmem)
  63           skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
  64
  65        pfile->cur_addr += len;
  66        pfile->pkt_len -= len;
  67
  68 _func_exit_;
  69
  70         return len;
  71 }
  72
  73 sint rtw_endofpktfile(struct pkt_file *pfile)
  74 {
  75 _func_enter_;
  76
  77         if (pfile->pkt_len == 0) {
  78 _func_exit_;
  79                 return true;
  80         }
  81
  82 _func_exit_;
  83
  84         return false;
  85 }
  86
  87 void rtw_set_tx_chksum_offload(struct sk_buff *pkt, struct pkt_attrib *pattrib)
  88 {
  89
  90 #ifdef CONFIG_TCP_CSUM_OFFLOAD_TX
  91         struct sk_buff *skb = (struct sk_buff *)pkt;
  92         pattrib->hw_tcp_csum = 0;
  93
  94         if (skb->ip_summed == CHECKSUM_PARTIAL) {
  95                 if (skb_shinfo(skb)->nr_frags == 0)
  96                 {
  97                         const struct iphdr *ip = ip_hdr(skb);
  98                         if (ip->protocol == IPPROTO_TCP) {
  99                                 // TCP checksum offload by HW
 100                                 DBG_871X("CHECKSUM_PARTIAL TCP\n");
 101                                 pattrib->hw_tcp_csum = 1;
 102                                 //skb_checksum_help(skb);
 103                         } else if (ip->protocol == IPPROTO_UDP) {
 104                                 //DBG_871X("CHECKSUM_PARTIAL UDP\n");
 105 #if 1
 106                                 skb_checksum_help(skb);
 107 #else
 108                                 // Set UDP checksum = 0 to skip checksum check
 109                                 struct udphdr *udp = skb_transport_header(skb);
 110                                 udp->check = 0;
 111 #endif
 112                         } else {
 113                                 DBG_871X("%s-%d TCP CSUM offload Error!!\n", __FUNCTION__, __LINE__);
 114                                 WARN_ON(1);     /* we need a WARN() */
 115                             }
 116                 }
 117                 else { // IP fragmentation case
 118                         DBG_871X("%s-%d nr_frags != 0, using skb_checksum_help(skb);!!\n", __FUNCTION__, __LINE__);
 119                         skb_checksum_help(skb);
 120                 }
 121         }
 122 #endif
 123
 124 }
 125
 126 int rtw_os_xmit_resource_alloc(_adapter *padapter, struct xmit_buf *pxmitbuf,u32 alloc_sz)
 127 {
 128         int i;
 129         struct dvobj_priv       *pdvobjpriv = adapter_to_dvobj(padapter);
 130         struct usb_device       *pusbd = pdvobjpriv->pusbdev;
 131
 132 #ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
 133         pxmitbuf->pallocated_buf = rtw_usb_buffer_alloc(pusbd, (size_t)alloc_sz, &pxmitbuf->dma_transfer_addr);
 134         pxmitbuf->pbuf = pxmitbuf->pallocated_buf;
 135         if(pxmitbuf->pallocated_buf == NULL)
 136                 return _FAIL;
 137 #else // CONFIG_USE_USB_BUFFER_ALLOC_TX
 138
 139         pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
 140         if (pxmitbuf->pallocated_buf == NULL)
 141         {
 142                 return _FAIL;
 143         }
 144
 145         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
 146         pxmitbuf->dma_transfer_addr = 0;
 147
 148 #endif // CONFIG_USE_USB_BUFFER_ALLOC_TX
 149
 150         for(i=0; i<8; i++)
 151         {
 152                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
 153                 if(pxmitbuf->pxmit_urb[i] == NULL)
 154                 {
 155                         DBG_871X("pxmitbuf->pxmit_urb[i]==NULL");
 156                         return _FAIL;
 157                 }
 158
 159         }
 160         return _SUCCESS;
 161 }
 162
 163 void rtw_os_xmit_resource_free(_adapter *padapter, struct xmit_buf *pxmitbuf,u32 free_sz)
 164 {
 165         int i;
 166         struct dvobj_priv       *pdvobjpriv = adapter_to_dvobj(padapter);
 167         struct usb_device       *pusbd = pdvobjpriv->pusbdev;
 168
 169
 170         for(i=0; i<8; i++)
 171         {
 172                 if(pxmitbuf->pxmit_urb[i])
 173                 {
 174                         //usb_kill_urb(pxmitbuf->pxmit_urb[i]);
 175                         usb_free_urb(pxmitbuf->pxmit_urb[i]);
 176                 }
 177         }
 178
 179 #ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
 180         rtw_usb_buffer_free(pusbd, (size_t)free_sz, pxmitbuf->pallocated_buf, pxmitbuf->dma_transfer_addr);
 181         pxmitbuf->pallocated_buf =  NULL;
 182         pxmitbuf->dma_transfer_addr = 0;
 183 #else   // CONFIG_USE_USB_BUFFER_ALLOC_TX
 184         if(pxmitbuf->pallocated_buf)
 185                 rtw_mfree(pxmitbuf->pallocated_buf, free_sz);
 186 #endif  // CONFIG_USE_USB_BUFFER_ALLOC_TX
 187 }
 188
 189 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 190
 191 void rtw_os_pkt_complete(_adapter *padapter, struct sk_buff *pkt)
 192 {
 193 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 194         u16     queue;
 195         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 196
 197         queue = skb_get_queue_mapping(pkt);
 198         if (padapter->registrypriv.wifi_spec) {
 199                 if(__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 200                         (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 201                 {
 202                         netif_wake_subqueue(padapter->pnetdev, queue);
 203                 }
 204         } else {
 205                 if(__netif_subqueue_stopped(padapter->pnetdev, queue))
 206                         netif_wake_subqueue(padapter->pnetdev, queue);
 207         }
 208 #else
 209         if (netif_queue_stopped(padapter->pnetdev))
 210                 netif_wake_queue(padapter->pnetdev);
 211 #endif
 212
 213         dev_kfree_skb_any(pkt);
 214 }
 215
 216 void rtw_os_xmit_complete(_adapter *padapter, struct xmit_frame *pxframe)
 217 {
 218         if(pxframe->pkt)
 219                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 220
 221         pxframe->pkt = NULL;
 222 }
 223
 224 void rtw_os_xmit_schedule(_adapter *padapter)
 225 {
 226         _adapter *pri_adapter = padapter;
 227
 228         unsigned long  irqL;
 229         struct xmit_priv *pxmitpriv;
 230
 231         if(!padapter)
 232                 return;
 233
 234         pxmitpriv = &padapter->xmitpriv;
 235
 236         _enter_critical_bh(&pxmitpriv->lock, &irqL);
 237
 238         if(rtw_txframes_pending(padapter))
 239                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 240
 241         _exit_critical_bh(&pxmitpriv->lock, &irqL);
 242 }
 243
 244 static void rtw_check_xmit_resource(_adapter *padapter, struct sk_buff *pkt)
 245 {
 246         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 247 #if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
 248         u16     queue;
 249
 250         queue = skb_get_queue_mapping(pkt);
 251         if (padapter->registrypriv.wifi_spec) {
 252                 /* No free space for Tx, tx_worker is too slow */
 253                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD) {
 254                         //DBG_871X("%s(): stop netif_subqueue[%d]\n", __FUNCTION__, queue);
 255                         netif_stop_subqueue(padapter->pnetdev, queue);
 256                 }
 257         } else {
 258                 if(pxmitpriv->free_xmitframe_cnt<=4) {
 259                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 260                                 netif_stop_subqueue(padapter->pnetdev, queue);
 261                 }
 262         }
 263 #else
 264         if(pxmitpriv->free_xmitframe_cnt<=4)
 265         {
 266                 if (!rtw_netif_queue_stopped(padapter->pnetdev))
 267                         rtw_netif_stop_queue(padapter->pnetdev);
 268         }
 269 #endif
 270 }
 271
 272 #ifdef CONFIG_TX_MCAST2UNI
 273 int rtw_mlcst2unicst(_adapter *padapter, struct sk_buff *skb)
 274 {
 275         struct  sta_priv *pstapriv = &padapter->stapriv;
 276         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 277         unsigned long   irqL;
 278         _list   *phead, *plist;
 279         struct sk_buff *newskb;
 280         struct sta_info *psta = NULL;
 281         s32     res;
 282
 283         _enter_critical_bh(&pstapriv->asoc_list_lock, &irqL);
 284         phead = &pstapriv->asoc_list;
 285         plist = get_next(phead);
 286
 287         //free sta asoc_queue
 288         while ((rtw_end_of_queue_search(phead, plist)) == false)
 289         {
 290                 psta = LIST_CONTAINOR(plist, struct sta_info, asoc_list);
 291
 292                 plist = get_next(plist);
 293
 294                 /* avoid   come from STA1 and send back STA1 */
 295                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 296                         continue;
 297
 298                 newskb = skb_copy(skb, GFP_ATOMIC);
 299
 300                 if (newskb) {
 301                         memcpy(newskb->data, psta->hwaddr, 6);
 302                         res = rtw_xmit(padapter, &newskb);
 303                         if (res < 0) {
 304                                 DBG_871X("%s()-%d: rtw_xmit() return error!\n", __FUNCTION__, __LINE__);
 305                                 pxmitpriv->tx_drop++;
 306                                 dev_kfree_skb_any(newskb);
 307                         } else
 308                                 pxmitpriv->tx_pkts++;
 309                 } else {
 310                         DBG_871X("%s-%d: skb_copy() failed!\n", __FUNCTION__, __LINE__);
 311                         pxmitpriv->tx_drop++;
 312
 313                         _exit_critical_bh(&pstapriv->asoc_list_lock, &irqL);
 314                         //dev_kfree_skb_any(skb);
 315                         return false;   // Caller shall tx this multicast frame via normal way.
 316                 }
 317         }
 318
 319         _exit_critical_bh(&pstapriv->asoc_list_lock, &irqL);
 320         dev_kfree_skb_any(skb);
 321         return true;
 322 }
 323 #endif  // CONFIG_TX_MCAST2UNI
 324
 325
 326 int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
 327 {
 328         _adapter *padapter = (_adapter *)rtw_netdev_priv(pnetdev);
 329         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 330 #ifdef CONFIG_TX_MCAST2UNI
 331         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 332         extern int rtw_mc2u_disable;
 333 #endif  // CONFIG_TX_MCAST2UNI
 334         s32 res = 0;
 335 #if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
 336         u16 queue;
 337 #endif
 338
 339 _func_enter_;
 340
 341         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 342
 343         if (rtw_if_up(padapter) == false) {
 344                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 345                 #ifdef DBG_TX_DROP_FRAME
 346                 DBG_871X("DBG_TX_DROP_FRAME %s if_up fail\n", __FUNCTION__);
 347                 #endif
 348                 goto drop_packet;
 349         }
 350
 351         rtw_check_xmit_resource(padapter, pkt);
 352
 353 #ifdef CONFIG_TX_MCAST2UNI
 354         if (!rtw_mc2u_disable &&
 355             check_fwstate(pmlmepriv, WIFI_AP_STATE) == true &&
 356             (IP_MCAST_MAC(pkt->data) ||
 357             ICMPV6_MCAST_MAC(pkt->data))) {
 358                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME / 4)) {
 359                         res = rtw_mlcst2unicst(padapter, pkt);
 360                         if (res == true)
 361                                 goto exit;
 362                 }
 363         }
 364 #endif  // CONFIG_TX_MCAST2UNI
 365
 366         res = rtw_xmit(padapter, &pkt);
 367         if (res < 0) {
 368                 #ifdef DBG_TX_DROP_FRAME
 369                 DBG_871X("DBG_TX_DROP_FRAME %s rtw_xmit fail\n", __FUNCTION__);
 370                 #endif
 371                 goto drop_packet;
 372         }
 373
 374         pxmitpriv->tx_pkts++;
 375         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 376         goto exit;
 377
 378 drop_packet:
 379         pxmitpriv->tx_drop++;
 380         dev_kfree_skb_any(pkt);
 381         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 382
 383 exit:
 384
 385 _func_exit_;
 386
 387         return 0;
 388 }
 389