text: /******************************************************************************
   * recv_linux.c
   *
   * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   * Linux device driver for RTL8192SU
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of version 2 of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
   *
   * Modifications for inclusion into the Linux staging tree are
   * Copyright(c) 2010 Larry Finger. All rights reserved.
   *
   * Contact information:
   * WLAN FAE <wlanfae@realtek.com>.
   * Larry Finger <Larry.Finger@lwfinger.net>
   *
   ******************************************************************************/
  
  #define _RECV_OSDEP_C_
  
  #include <linux/usb.h>
  
  #include "osdep_service.h"
  #include "drv_types.h"
  #include "wifi.h"
  #include "recv_osdep.h"
  #include "osdep_intf.h"
  #include "ethernet.h"
  #include <linux/if_arp.h>
  #include "usb_ops.h"
  
  /*init os related resource in struct recv_priv*/
  /*alloc os related resource in union recv_frame*/
  int r8712_os_recv_resource_alloc(struct _adapter *padapter,
  				 union recv_frame *precvframe)
  {
  	precvframe->u.hdr.pkt_newalloc = precvframe->u.hdr.pkt = NULL;
  	return _SUCCESS;
  }
  
  /*alloc os related resource in struct recv_buf*/
  int r8712_os_recvbuf_resource_alloc(struct _adapter *padapter,
  				    struct recv_buf *precvbuf)
  {
  	int res = _SUCCESS;
  
  	precvbuf->irp_pending = false;
  	precvbuf->purb = usb_alloc_urb(0, GFP_KERNEL);
  	if (precvbuf->purb == NULL)
  		res = _FAIL;
  	precvbuf->pskb = NULL;
  	precvbuf->reuse = false;
  	precvbuf->pallocated_buf = NULL;
  	precvbuf->pbuf = NULL;
  	precvbuf->pdata = NULL;
  	precvbuf->phead = NULL;
  	precvbuf->ptail = NULL;
  	precvbuf->pend = NULL;
  	precvbuf->transfer_len = 0;
  	precvbuf->len = 0;
  	return res;
  }
  
  /*free os related resource in struct recv_buf*/
  int r8712_os_recvbuf_resource_free(struct _adapter *padapter,
  			     struct recv_buf *precvbuf)
  {
  	if (precvbuf->pskb)
  		dev_kfree_skb_any(precvbuf->pskb);
  	if (precvbuf->purb) {
  		usb_kill_urb(precvbuf->purb);
  		usb_free_urb(precvbuf->purb);
  	}
  	return _SUCCESS;
  }
  
  void r8712_handle_tkip_mic_err(struct _adapter *padapter, u8 bgroup)
  {
  	union iwreq_data wrqu;
  	struct iw_michaelmicfailure ev;
  	struct mlme_priv *pmlmepriv  = &padapter->mlmepriv;
  
  	memset(&ev, 0x00, sizeof(ev));
  	if (bgroup)
  		ev.flags |= IW_MICFAILURE_GROUP;
  	else
  		ev.flags |= IW_MICFAILURE_PAIRWISE;
  	ev.src_addr.sa_family = ARPHRD_ETHER;
  	memcpy(ev.src_addr.sa_data, &pmlmepriv->assoc_bssid[0], ETH_ALEN);
  	memset(&wrqu, 0x00, sizeof(wrqu));
  	wrqu.data.length = sizeof(ev);
  	wireless_send_event(padapter->pnetdev, IWEVMICHAELMICFAILURE, &wrqu,
  			    (char *)&ev);
  }
  
  void r8712_recv_indicatepkt(struct _adapter *padapter,
  			    union recv_frame *precv_frame)
  {
  	struct recv_priv *precvpriv;
  	struct  __queue	*pfree_recv_queue;
  	_pkt *skb;
  	struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
  
  	precvpriv = &(padapter->recvpriv);
  	pfree_recv_queue = &(precvpriv->free_recv_queue);
  	skb = precv_frame->u.hdr.pkt;
  	if (skb == NULL)
  		goto _recv_indicatepkt_drop;
  	skb->data = precv_frame->u.hdr.rx_data;
  	skb->len = precv_frame->u.hdr.len;
  	skb_set_tail_pointer(skb, skb->len);
  	if ((pattrib->tcpchk_valid == 1) && (pattrib->tcp_chkrpt == 1))
  		skb->ip_summed = CHECKSUM_UNNECESSARY;
  	else
  		skb->ip_summed = CHECKSUM_NONE;
  	skb->dev = padapter->pnetdev;
  	skb->protocol = eth_type_trans(skb, padapter->pnetdev);
  	netif_rx(skb);
  	precv_frame->u.hdr.pkt = NULL; /* pointers to NULL before
  					* r8712_free_recvframe() */
  	r8712_free_recvframe(precv_frame, pfree_recv_queue);
  	return;
  _recv_indicatepkt_drop:
  	 /*enqueue back to free_recv_queue*/
  	 if (precv_frame)
  		r8712_free_recvframe(precv_frame, pfree_recv_queue);
  	 precvpriv->rx_drop++;
  }
  
  void r8712_os_read_port(struct _adapter *padapter, struct recv_buf *precvbuf)
  {
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  
  	precvbuf->ref_cnt--;
  	/*free skb in recv_buf*/
  	dev_kfree_skb_any(precvbuf->pskb);
  	precvbuf->pskb = NULL;
  	precvbuf->reuse = false;
  	if (!precvbuf->irp_pending)
  		r8712_read_port(padapter, precvpriv->ff_hwaddr, 0,
  			 (unsigned char *)precvbuf);
  }
  
  static void _r8712_reordering_ctrl_timeout_handler (void *FunctionContext)
  {
  	struct recv_reorder_ctrl *preorder_ctrl =
  			 (struct recv_reorder_ctrl *)FunctionContext;
  
  	r8712_reordering_ctrl_timeout_handler(preorder_ctrl);
  }
  
  void r8712_init_recv_timer(struct recv_reorder_ctrl *preorder_ctrl)
  {
  	struct _adapter *padapter = preorder_ctrl->padapter;
  
  	_init_timer(&(preorder_ctrl->reordering_ctrl_timer), padapter->pnetdev,
  		    _r8712_reordering_ctrl_timeout_handler, preorder_ctrl);
  }
  