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 #ifdef CONFIG_USB_HCI
 129         int i;
 130         struct dvobj_priv       *pdvobjpriv = adapter_to_dvobj(padapter);
 131         struct usb_device       *pusbd = pdvobjpriv->pusbdev;
 132
 133 #ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
 134         pxmitbuf->pallocated_buf = rtw_usb_buffer_alloc(pusbd, (size_t)alloc_sz, &pxmitbuf->dma_transfer_addr);
 135         pxmitbuf->pbuf = pxmitbuf->pallocated_buf;
 136         if(pxmitbuf->pallocated_buf == NULL)
 137                 return _FAIL;
 138 #else // CONFIG_USE_USB_BUFFER_ALLOC_TX
 139
 140         pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
 141         if (pxmitbuf->pallocated_buf == NULL)
 142         {
 143                 return _FAIL;
 144         }
 145
 146         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
 147         pxmitbuf->dma_transfer_addr = 0;
 148
 149 #endif // CONFIG_USE_USB_BUFFER_ALLOC_TX
 150
 151         for(i=0; i<8; i++)
 152         {
 153                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
 154                 if(pxmitbuf->pxmit_urb[i] == NULL)
 155                 {
 156                         DBG_871X("pxmitbuf->pxmit_urb[i]==NULL");
 157                         return _FAIL;
 158                 }
 159
 160         }
 161 #endif
 162 #if defined(CONFIG_PCI_HCI) || defined(CONFIG_SDIO_HCI) || defined(CONFIG_GSPI_HCI)
 163         pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
 164         if (pxmitbuf->pallocated_buf == NULL)
 165         {
 166                 return _FAIL;
 167         }
 168
 169         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
 170 #endif
 171
 172         return _SUCCESS;
 173 }
 174
 175 void rtw_os_xmit_resource_free(_adapter *padapter, struct xmit_buf *pxmitbuf,u32 free_sz)
 176 {
 177 #ifdef CONFIG_USB_HCI
 178         int i;
 179         struct dvobj_priv       *pdvobjpriv = adapter_to_dvobj(padapter);
 180         struct usb_device       *pusbd = pdvobjpriv->pusbdev;
 181
 182
 183         for(i=0; i<8; i++)
 184         {
 185                 if(pxmitbuf->pxmit_urb[i])
 186                 {
 187                         //usb_kill_urb(pxmitbuf->pxmit_urb[i]);
 188                         usb_free_urb(pxmitbuf->pxmit_urb[i]);
 189                 }
 190         }
 191
 192 #ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
 193         rtw_usb_buffer_free(pusbd, (size_t)free_sz, pxmitbuf->pallocated_buf, pxmitbuf->dma_transfer_addr);
 194         pxmitbuf->pallocated_buf =  NULL;
 195         pxmitbuf->dma_transfer_addr = 0;
 196 #else   // CONFIG_USE_USB_BUFFER_ALLOC_TX
 197         if(pxmitbuf->pallocated_buf)
 198                 rtw_mfree(pxmitbuf->pallocated_buf, free_sz);
 199 #endif  // CONFIG_USE_USB_BUFFER_ALLOC_TX
 200
 201 #endif
 202 #if defined(CONFIG_PCI_HCI) || defined(CONFIG_SDIO_HCI) || defined(CONFIG_GSPI_HCI)
 203         if(pxmitbuf->pallocated_buf)
 204                 rtw_mfree(pxmitbuf->pallocated_buf, free_sz);
 205 #endif
 206 }
 207
 208 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 209
 210 void rtw_os_pkt_complete(_adapter *padapter, struct sk_buff *pkt)
 211 {
 212 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 213         u16     queue;
 214         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 215
 216         queue = skb_get_queue_mapping(pkt);
 217         if (padapter->registrypriv.wifi_spec) {
 218                 if(__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 219                         (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 220                 {
 221                         netif_wake_subqueue(padapter->pnetdev, queue);
 222                 }
 223         } else {
 224                 if(__netif_subqueue_stopped(padapter->pnetdev, queue))
 225                         netif_wake_subqueue(padapter->pnetdev, queue);
 226         }
 227 #else
 228         if (netif_queue_stopped(padapter->pnetdev))
 229                 netif_wake_queue(padapter->pnetdev);
 230 #endif
 231
 232         dev_kfree_skb_any(pkt);
 233 }
 234
 235 void rtw_os_xmit_complete(_adapter *padapter, struct xmit_frame *pxframe)
 236 {
 237         if(pxframe->pkt)
 238         {
 239                 //RT_TRACE(_module_xmit_osdep_c_,_drv_err_,("linux : rtw_os_xmit_complete, dev_kfree_skb()\n"));
 240
 241                 //dev_kfree_skb_any(pxframe->pkt);
 242                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 243
 244         }
 245
 246         pxframe->pkt = NULL;
 247 }
 248
 249 void rtw_os_xmit_schedule(_adapter *padapter)
 250 {
 251         _adapter *pri_adapter = padapter;
 252
 253 #if defined(CONFIG_SDIO_HCI) || defined(CONFIG_GSPI_HCI)
 254         if(!padapter)
 255                 return;
 256
 257 #ifdef CONFIG_CONCURRENT_MODE
 258         if(padapter->adapter_type > PRIMARY_ADAPTER)
 259                 pri_adapter = padapter->pbuddy_adapter;
 260 #endif
 261
 262         if (_rtw_queue_empty(&pri_adapter->xmitpriv.pending_xmitbuf_queue) == false)
 263                 _rtw_up_sema(&pri_adapter->xmitpriv.xmit_sema);
 264
 265
 266 #else
 267         unsigned long  irqL;
 268         struct xmit_priv *pxmitpriv;
 269
 270         if(!padapter)
 271                 return;
 272
 273         pxmitpriv = &padapter->xmitpriv;
 274
 275         _enter_critical_bh(&pxmitpriv->lock, &irqL);
 276
 277         if(rtw_txframes_pending(padapter))
 278         {
 279                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 280         }
 281
 282         _exit_critical_bh(&pxmitpriv->lock, &irqL);
 283 #endif
 284 }
 285
 286 static void rtw_check_xmit_resource(_adapter *padapter, struct sk_buff *pkt)
 287 {
 288         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 289 #if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
 290         u16     queue;
 291
 292         queue = skb_get_queue_mapping(pkt);
 293         if (padapter->registrypriv.wifi_spec) {
 294                 /* No free space for Tx, tx_worker is too slow */
 295                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD) {
 296                         //DBG_871X("%s(): stop netif_subqueue[%d]\n", __FUNCTION__, queue);
 297                         netif_stop_subqueue(padapter->pnetdev, queue);
 298                 }
 299         } else {
 300                 if(pxmitpriv->free_xmitframe_cnt<=4) {
 301                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 302                                 netif_stop_subqueue(padapter->pnetdev, queue);
 303                 }
 304         }
 305 #else
 306         if(pxmitpriv->free_xmitframe_cnt<=4)
 307         {
 308                 if (!rtw_netif_queue_stopped(padapter->pnetdev))
 309                         rtw_netif_stop_queue(padapter->pnetdev);
 310         }
 311 #endif
 312 }
 313
 314 #ifdef CONFIG_TX_MCAST2UNI
 315 int rtw_mlcst2unicst(_adapter *padapter, struct sk_buff *skb)
 316 {
 317         struct  sta_priv *pstapriv = &padapter->stapriv;
 318         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 319         unsigned long   irqL;
 320         _list   *phead, *plist;
 321         struct sk_buff *newskb;
 322         struct sta_info *psta = NULL;
 323         s32     res;
 324
 325         _enter_critical_bh(&pstapriv->asoc_list_lock, &irqL);
 326         phead = &pstapriv->asoc_list;
 327         plist = get_next(phead);
 328
 329         //free sta asoc_queue
 330         while ((rtw_end_of_queue_search(phead, plist)) == false)
 331         {
 332                 psta = LIST_CONTAINOR(plist, struct sta_info, asoc_list);
 333
 334                 plist = get_next(plist);
 335
 336                 /* avoid   come from STA1 and send back STA1 */
 337                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 338                         continue;
 339
 340                 newskb = skb_copy(skb, GFP_ATOMIC);
 341
 342                 if (newskb) {
 343                         memcpy(newskb->data, psta->hwaddr, 6);
 344                         res = rtw_xmit(padapter, &newskb);
 345                         if (res < 0) {
 346                                 DBG_871X("%s()-%d: rtw_xmit() return error!\n", __FUNCTION__, __LINE__);
 347                                 pxmitpriv->tx_drop++;
 348                                 dev_kfree_skb_any(newskb);
 349                         } else
 350                                 pxmitpriv->tx_pkts++;
 351                 } else {
 352                         DBG_871X("%s-%d: skb_copy() failed!\n", __FUNCTION__, __LINE__);
 353                         pxmitpriv->tx_drop++;
 354
 355                         _exit_critical_bh(&pstapriv->asoc_list_lock, &irqL);
 356                         //dev_kfree_skb_any(skb);
 357                         return false;   // Caller shall tx this multicast frame via normal way.
 358                 }
 359         }
 360
 361         _exit_critical_bh(&pstapriv->asoc_list_lock, &irqL);
 362         dev_kfree_skb_any(skb);
 363         return true;
 364 }
 365 #endif  // CONFIG_TX_MCAST2UNI
 366
 367
 368 int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
 369 {
 370         _adapter *padapter = (_adapter *)rtw_netdev_priv(pnetdev);
 371         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 372 #ifdef CONFIG_TX_MCAST2UNI
 373         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 374         extern int rtw_mc2u_disable;
 375 #endif  // CONFIG_TX_MCAST2UNI
 376         s32 res = 0;
 377 #if (LINUX_VERSION_CODE>=KERNEL_VERSION(2,6,35))
 378         u16 queue;
 379 #endif
 380
 381 _func_enter_;
 382
 383         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 384
 385         if (rtw_if_up(padapter) == false) {
 386                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 387                 #ifdef DBG_TX_DROP_FRAME
 388                 DBG_871X("DBG_TX_DROP_FRAME %s if_up fail\n", __FUNCTION__);
 389                 #endif
 390                 goto drop_packet;
 391         }
 392
 393         rtw_check_xmit_resource(padapter, pkt);
 394
 395 #ifdef CONFIG_TX_MCAST2UNI
 396         if (!rtw_mc2u_disable &&
 397             check_fwstate(pmlmepriv, WIFI_AP_STATE) == true &&
 398             (IP_MCAST_MAC(pkt->data) ||
 399             ICMPV6_MCAST_MAC(pkt->data))) {
 400                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME / 4)) {
 401                         res = rtw_mlcst2unicst(padapter, pkt);
 402                         if (res == true)
 403                                 goto exit;
 404                 }
 405         }
 406 #endif  // CONFIG_TX_MCAST2UNI
 407
 408         res = rtw_xmit(padapter, &pkt);
 409         if (res < 0) {
 410                 #ifdef DBG_TX_DROP_FRAME
 411                 DBG_871X("DBG_TX_DROP_FRAME %s rtw_xmit fail\n", __FUNCTION__);
 412                 #endif
 413                 goto drop_packet;
 414         }
 415
 416         pxmitpriv->tx_pkts++;
 417         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 418         goto exit;
 419
 420 drop_packet:
 421         pxmitpriv->tx_drop++;
 422         dev_kfree_skb_any(pkt);
 423         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 424
 425 exit:
 426
 427 _func_exit_;
 428
 429         return 0;
 430 }
 431