text: /******************************************************************************
   *
   * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
   *
   * 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
   *
   *
   ******************************************************************************/
  #define _RTW_RECV_C_
  
  #include <osdep_service.h>
  #include <drv_types.h>
  #include <recv_osdep.h>
  #include <mlme_osdep.h>
  #include <wifi.h>
  #include <linux/vmalloc.h>
  
  #define ETHERNET_HEADER_SIZE	14	/*  Ethernet Header Length */
  #define LLC_HEADER_SIZE			6	/*  LLC Header Length */
  
  static u8 SNAP_ETH_TYPE_IPX[2] = {0x81, 0x37};
  static u8 SNAP_ETH_TYPE_APPLETALK_AARP[2] = {0x80, 0xf3};
  
  /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  static u8 rtw_bridge_tunnel_header[] = {
         0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8
  };
  
  static u8 rtw_rfc1042_header[] = {
         0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
  };
  
  void rtw_signal_stat_timer_hdl(unsigned long data);
  
  void _rtw_init_sta_recv_priv(struct sta_recv_priv *psta_recvpriv)
  {
  
  	memset((u8 *)psta_recvpriv, 0, sizeof(struct sta_recv_priv));
  
  	spin_lock_init(&psta_recvpriv->lock);
  
  	_rtw_init_queue(&psta_recvpriv->defrag_q);
  
  }
  
  int _rtw_init_recv_priv(struct recv_priv *precvpriv, struct adapter *padapter)
  {
  	int i;
  
  	struct recv_frame *precvframe;
  
  	int	res = _SUCCESS;
  
  	_rtw_init_queue(&precvpriv->free_recv_queue);
  	_rtw_init_queue(&precvpriv->recv_pending_queue);
  	_rtw_init_queue(&precvpriv->uc_swdec_pending_queue);
  
  	precvpriv->adapter = padapter;
  
  	precvpriv->free_recvframe_cnt = NR_RECVFRAME;
  
  	precvpriv->pallocated_frame_buf = vzalloc(NR_RECVFRAME * sizeof(struct recv_frame) + RXFRAME_ALIGN_SZ);
  
  	if (precvpriv->pallocated_frame_buf == NULL) {
  		res = _FAIL;
  		goto exit;
  	}
  
  	precvpriv->precv_frame_buf = (u8 *)N_BYTE_ALIGMENT((size_t)(precvpriv->pallocated_frame_buf), RXFRAME_ALIGN_SZ);
  
  	precvframe = (struct recv_frame *)precvpriv->precv_frame_buf;
  
  	for (i = 0; i < NR_RECVFRAME; i++) {
  		INIT_LIST_HEAD(&(precvframe->list));
  
  		list_add_tail(&(precvframe->list),
  				     &(precvpriv->free_recv_queue.queue));
  
  		res = rtw_os_recv_resource_alloc(padapter, precvframe);
  
  		precvframe->len = 0;
  
  		precvframe->adapter = padapter;
  		precvframe++;
  	}
  	precvpriv->rx_pending_cnt = 1;
  
  	res = rtw_hal_init_recv_priv(padapter);
  
  	setup_timer(&precvpriv->signal_stat_timer,
  		    rtw_signal_stat_timer_hdl,
  		    (unsigned long)padapter);
  
  	precvpriv->signal_stat_sampling_interval = 1000; /* ms */
  
  	rtw_set_signal_stat_timer(precvpriv);
  exit:
  
  
  	return res;
  }
  
  void _rtw_free_recv_priv(struct recv_priv *precvpriv)
  {
  	struct adapter	*padapter = precvpriv->adapter;
  
  
  	rtw_free_uc_swdec_pending_queue(padapter);
  
  	if (precvpriv->pallocated_frame_buf) {
  		vfree(precvpriv->pallocated_frame_buf);
  	}
  
  	rtw_hal_free_recv_priv(padapter);
  
  }
  
  struct recv_frame *_rtw_alloc_recvframe(struct __queue *pfree_recv_queue)
  {
  	struct recv_frame *hdr;
  	struct list_head *plist, *phead;
  	struct adapter *padapter;
  	struct recv_priv *precvpriv;
  
  	if (list_empty(&pfree_recv_queue->queue)) {
  		hdr = NULL;
  	} else {
  		phead = get_list_head(pfree_recv_queue);
  
  		plist = phead->next;
  
  		hdr = container_of(plist, struct recv_frame, list);
  
  		list_del_init(&hdr->list);
  		padapter = hdr->adapter;
  		if (padapter != NULL) {
  			precvpriv = &padapter->recvpriv;
  			if (pfree_recv_queue == &precvpriv->free_recv_queue)
  				precvpriv->free_recvframe_cnt--;
  		}
  	}
  
  
  	return (struct recv_frame *)hdr;
  }
  
  struct recv_frame *rtw_alloc_recvframe(struct __queue *pfree_recv_queue)
  {
  	struct recv_frame  *precvframe;
  
  	spin_lock_bh(&pfree_recv_queue->lock);
  
  	precvframe = _rtw_alloc_recvframe(pfree_recv_queue);
  
  	spin_unlock_bh(&pfree_recv_queue->lock);
  
  	return precvframe;
  }
  
  void rtw_init_recvframe(struct recv_frame *precvframe, struct recv_priv *precvpriv)
  {
  	/* Perry: This can be removed */
  	INIT_LIST_HEAD(&precvframe->list);
  
  	precvframe->len = 0;
  }
  
  int rtw_free_recvframe(struct recv_frame *precvframe,
  		       struct __queue *pfree_recv_queue)
  {
  	struct adapter *padapter;
  	struct recv_priv *precvpriv;
  
  	if (!precvframe)
  		return _FAIL;
  	padapter = precvframe->adapter;
  	precvpriv = &padapter->recvpriv;
  	if (precvframe->pkt) {
  		dev_kfree_skb_any(precvframe->pkt);/* free skb by driver */
  		precvframe->pkt = NULL;
  	}
  
  	spin_lock_bh(&pfree_recv_queue->lock);
  
  	list_del_init(&(precvframe->list));
  
  	precvframe->len = 0;
  
  	list_add_tail(&(precvframe->list), get_list_head(pfree_recv_queue));
  
  	if (padapter != NULL) {
  		if (pfree_recv_queue == &precvpriv->free_recv_queue)
  				precvpriv->free_recvframe_cnt++;
  	}
  
        spin_unlock_bh(&pfree_recv_queue->lock);
  
  
  	return _SUCCESS;
  }
  
  int _rtw_enqueue_recvframe(struct recv_frame *precvframe, struct __queue *queue)
  {
  	struct adapter *padapter = precvframe->adapter;
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  
  
  	list_del_init(&(precvframe->list));
  	list_add_tail(&(precvframe->list), get_list_head(queue));
  
  	if (padapter != NULL) {
  		if (queue == &precvpriv->free_recv_queue)
  			precvpriv->free_recvframe_cnt++;
  	}
  
  
  	return _SUCCESS;
  }
  
  int rtw_enqueue_recvframe(struct recv_frame *precvframe, struct __queue *queue)
  {
  	int ret;
  
  	spin_lock_bh(&queue->lock);
  	ret = _rtw_enqueue_recvframe(precvframe, queue);
  	spin_unlock_bh(&queue->lock);
  
  	return ret;
  }
  
  /*
  caller : defrag ; recvframe_chk_defrag in recv_thread  (passive)
  pframequeue: defrag_queue : will be accessed in recv_thread  (passive)
  
  using spinlock to protect
  
  */
  
  void rtw_free_recvframe_queue(struct __queue *pframequeue,  struct __queue *pfree_recv_queue)
  {
  	struct recv_frame *hdr;
  	struct list_head *plist, *phead;
  
  	spin_lock(&pframequeue->lock);
  
  	phead = get_list_head(pframequeue);
  	plist = phead->next;
  
  	while (phead != plist) {
  		hdr = container_of(plist, struct recv_frame, list);
  
  		plist = plist->next;
  
  		rtw_free_recvframe((struct recv_frame *)hdr, pfree_recv_queue);
  	}
  
  	spin_unlock(&pframequeue->lock);
  
  }
  
  u32 rtw_free_uc_swdec_pending_queue(struct adapter *adapter)
  {
  	u32 cnt = 0;
  	struct recv_frame *pending_frame;
  	while ((pending_frame = rtw_alloc_recvframe(&adapter->recvpriv.uc_swdec_pending_queue))) {
  		rtw_free_recvframe(pending_frame, &adapter->recvpriv.free_recv_queue);
  		DBG_88E("%s: dequeue uc_swdec_pending_queue\n", __func__);
  		cnt++;
  	}
  
  	return cnt;
  }
  
  static int recvframe_chkmic(struct adapter *adapter,
  			    struct recv_frame *precvframe)
  {
  	int	i, res = _SUCCESS;
  	u32	datalen;
  	u8	miccode[8];
  	u8	bmic_err = false, brpt_micerror = true;
  	u8	*pframe, *payload, *pframemic;
  	u8	*mickey;
  	struct	sta_info		*stainfo;
  	struct	rx_pkt_attrib	*prxattrib = &precvframe->attrib;
  	struct	security_priv	*psecuritypriv = &adapter->securitypriv;
  
  	struct mlme_ext_priv	*pmlmeext = &adapter->mlmeextpriv;
  	struct mlme_ext_info	*pmlmeinfo = &(pmlmeext->mlmext_info);
  
  	stainfo = rtw_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);
  
  	if (prxattrib->encrypt == _TKIP_) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n recvframe_chkmic:prxattrib->encrypt==_TKIP_\n"));
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n recvframe_chkmic:da=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
  			 prxattrib->ra[0], prxattrib->ra[1], prxattrib->ra[2], prxattrib->ra[3], prxattrib->ra[4], prxattrib->ra[5]));
  
  		/* calculate mic code */
  		if (stainfo != NULL) {
  			if (IS_MCAST(prxattrib->ra)) {
  				if (!psecuritypriv) {
  					res = _FAIL;
  					RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("\n recvframe_chkmic:didn't install group key!!!!!!!!!!\n"));
  					DBG_88E("\n recvframe_chkmic:didn't install group key!!!!!!!!!!\n");
  					goto exit;
  				}
  				mickey = &psecuritypriv->dot118021XGrprxmickey[prxattrib->key_index].skey[0];
  
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n recvframe_chkmic: bcmc key\n"));
  			} else {
  				mickey = &stainfo->dot11tkiprxmickey.skey[0];
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("\n recvframe_chkmic: unicast key\n"));
  			}
  
  			/* icv_len included the mic code */
  			datalen = precvframe->len-prxattrib->hdrlen -
  				  prxattrib->iv_len-prxattrib->icv_len-8;
  			pframe = precvframe->rx_data;
  			payload = pframe+prxattrib->hdrlen+prxattrib->iv_len;
  
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n prxattrib->iv_len=%d prxattrib->icv_len=%d\n", prxattrib->iv_len, prxattrib->icv_len));
  			rtw_seccalctkipmic(mickey, pframe, payload, datalen, &miccode[0],
  					   (unsigned char)prxattrib->priority); /* care the length of the data */
  
  			pframemic = payload+datalen;
  
  			bmic_err = false;
  
  			for (i = 0; i < 8; i++) {
  				if (miccode[i] != *(pframemic+i)) {
  					RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
  						 ("recvframe_chkmic:miccode[%d](%02x)!=*(pframemic+%d)(%02x) ",
  						 i, miccode[i], i, *(pframemic+i)));
  					bmic_err = true;
  				}
  			}
  
  			if (bmic_err) {
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
  					 ("\n *(pframemic-8)-*(pframemic-1)=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
  					 *(pframemic-8), *(pframemic-7), *(pframemic-6),
  					 *(pframemic-5), *(pframemic-4), *(pframemic-3),
  					 *(pframemic-2), *(pframemic-1)));
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
  					 ("\n *(pframemic-16)-*(pframemic-9)=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
  					 *(pframemic-16), *(pframemic-15), *(pframemic-14),
  					 *(pframemic-13), *(pframemic-12), *(pframemic-11),
  					 *(pframemic-10), *(pframemic-9)));
  				{
  					uint i;
  					RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
  						 ("\n ======demp packet (len=%d)======\n",
  						 precvframe->len));
  					for (i = 0; i < precvframe->len; i += 8) {
  						RT_TRACE(_module_rtl871x_recv_c_,
  							 _drv_err_,
  							 ("0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x",
  							 *(precvframe->rx_data+i),
  							 *(precvframe->rx_data+i+1),
  							 *(precvframe->rx_data+i+2),
  							 *(precvframe->rx_data+i+3),
  							 *(precvframe->rx_data+i+4),
  							 *(precvframe->rx_data+i+5),
  							 *(precvframe->rx_data+i+6),
  							 *(precvframe->rx_data+i+7)));
  					}
  					RT_TRACE(_module_rtl871x_recv_c_,
  						 _drv_err_,
  						 ("\n ====== demp packet end [len=%d]======\n",
  						 precvframe->len));
  					RT_TRACE(_module_rtl871x_recv_c_,
  						 _drv_err_,
  						 ("\n hrdlen=%d,\n",
  						 prxattrib->hdrlen));
  				}
  
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
  					 ("ra=0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x psecuritypriv->binstallGrpkey=%d ",
  					 prxattrib->ra[0], prxattrib->ra[1], prxattrib->ra[2],
  					 prxattrib->ra[3], prxattrib->ra[4], prxattrib->ra[5], psecuritypriv->binstallGrpkey));
  
  				/*  double check key_index for some timing issue , */
  				/*  cannot compare with psecuritypriv->dot118021XGrpKeyid also cause timing issue */
  				if ((IS_MCAST(prxattrib->ra) == true)  && (prxattrib->key_index != pmlmeinfo->key_index))
  					brpt_micerror = false;
  
  				if ((prxattrib->bdecrypted) && (brpt_micerror)) {
  					rtw_handle_tkip_mic_err(adapter, (u8)IS_MCAST(prxattrib->ra));
  					RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" mic error :prxattrib->bdecrypted=%d ", prxattrib->bdecrypted));
  					DBG_88E(" mic error :prxattrib->bdecrypted=%d\n", prxattrib->bdecrypted);
  				} else {
  					RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" mic error :prxattrib->bdecrypted=%d ", prxattrib->bdecrypted));
  					DBG_88E(" mic error :prxattrib->bdecrypted=%d\n", prxattrib->bdecrypted);
  				}
  				res = _FAIL;
  			} else {
  				/* mic checked ok */
  				if ((!psecuritypriv->bcheck_grpkey) && (IS_MCAST(prxattrib->ra))) {
  					psecuritypriv->bcheck_grpkey = true;
  					RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("psecuritypriv->bcheck_grpkey = true"));
  				}
  			}
  		} else {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recvframe_chkmic: rtw_get_stainfo==NULL!!!\n"));
  		}
  
  		recvframe_pull_tail(precvframe, 8);
  	}
  
  exit:
  
  
  	return res;
  }
  
  /* decrypt and set the ivlen, icvlen of the recv_frame */
  static struct recv_frame *decryptor(struct adapter *padapter,
  				    struct recv_frame *precv_frame)
  {
  	struct rx_pkt_attrib *prxattrib = &precv_frame->attrib;
  	struct security_priv *psecuritypriv = &padapter->securitypriv;
  	struct recv_frame *return_packet = precv_frame;
  	u32	 res = _SUCCESS;
  
  	RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("prxstat->decrypted=%x prxattrib->encrypt=0x%03x\n", prxattrib->bdecrypted, prxattrib->encrypt));
  
  	if (prxattrib->encrypt > 0) {
  		u8 *iv = precv_frame->rx_data+prxattrib->hdrlen;
  		prxattrib->key_index = (((iv[3])>>6)&0x3);
  
  		if (prxattrib->key_index > WEP_KEYS) {
  			DBG_88E("prxattrib->key_index(%d)>WEP_KEYS\n", prxattrib->key_index);
  
  			switch (prxattrib->encrypt) {
  			case _WEP40_:
  			case _WEP104_:
  				prxattrib->key_index = psecuritypriv->dot11PrivacyKeyIndex;
  				break;
  			case _TKIP_:
  			case _AES_:
  			default:
  				prxattrib->key_index = psecuritypriv->dot118021XGrpKeyid;
  				break;
  			}
  		}
  	}
  
  	if ((prxattrib->encrypt > 0) && ((prxattrib->bdecrypted == 0) || (psecuritypriv->sw_decrypt))) {
  		psecuritypriv->hw_decrypted = false;
  
  		switch (prxattrib->encrypt) {
  		case _WEP40_:
  		case _WEP104_:
  			rtw_wep_decrypt(padapter, (u8 *)precv_frame);
  			break;
  		case _TKIP_:
  			res = rtw_tkip_decrypt(padapter, (u8 *)precv_frame);
  			break;
  		case _AES_:
  			res = rtw_aes_decrypt(padapter, (u8 *)precv_frame);
  			break;
  		default:
  			break;
  		}
  	} else if (prxattrib->bdecrypted == 1 && prxattrib->encrypt > 0 &&
  		   (psecuritypriv->busetkipkey == 1 || prxattrib->encrypt != _TKIP_))
  			psecuritypriv->hw_decrypted = true;
  
  	if (res == _FAIL) {
  		rtw_free_recvframe(return_packet, &padapter->recvpriv.free_recv_queue);
  		return_packet = NULL;
  	}
  
  
  	return return_packet;
  }
  
  /* set the security information in the recv_frame */
  static struct recv_frame *portctrl(struct adapter *adapter,
  				   struct recv_frame *precv_frame)
  {
  	u8   *psta_addr, *ptr;
  	uint  auth_alg;
  	struct recv_frame *pfhdr;
  	struct sta_info *psta;
  	struct sta_priv *pstapriv;
  	struct recv_frame *prtnframe;
  	u16	ether_type;
  	u16  eapol_type = 0x888e;/* for Funia BD's WPA issue */
  	struct rx_pkt_attrib *pattrib;
  	__be16 be_tmp;
  
  
  	pstapriv = &adapter->stapriv;
  
  	auth_alg = adapter->securitypriv.dot11AuthAlgrthm;
  
  	ptr = precv_frame->rx_data;
  	pfhdr = precv_frame;
  	pattrib = &pfhdr->attrib;
  	psta_addr = pattrib->ta;
  	psta = rtw_get_stainfo(pstapriv, psta_addr);
  
  	prtnframe = NULL;
  
  	RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:adapter->securitypriv.dot11AuthAlgrthm=%d\n", adapter->securitypriv.dot11AuthAlgrthm));
  
  	if (auth_alg == 2) {
  		/* get ether_type */
  		ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE;
  		memcpy(&be_tmp, ptr, 2);
  		ether_type = ntohs(be_tmp);
  
  		if ((psta != NULL) && (psta->ieee8021x_blocked)) {
  			/* blocked */
  			/* only accept EAPOL frame */
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:psta->ieee8021x_blocked==1\n"));
  
  			if (ether_type == eapol_type) {
  				prtnframe = precv_frame;
  			} else {
  				/* free this frame */
  				rtw_free_recvframe(precv_frame, &adapter->recvpriv.free_recv_queue);
  				prtnframe = NULL;
  			}
  		} else {
  			/* allowed */
  			/* check decryption status, and decrypt the frame if needed */
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:psta->ieee8021x_blocked==0\n"));
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
  				 ("portctrl:precv_frame->hdr.attrib.privacy=%x\n",
  				 precv_frame->attrib.privacy));
  
  			if (pattrib->bdecrypted == 0)
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("portctrl:prxstat->decrypted=%x\n", pattrib->bdecrypted));
  
  			prtnframe = precv_frame;
  			/* check is the EAPOL frame or not (Rekey) */
  			if (ether_type == eapol_type) {
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("########portctrl:ether_type==0x888e\n"));
  				/* check Rekey */
  
  				prtnframe = precv_frame;
  			} else {
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:ether_type=0x%04x\n", ether_type));
  			}
  		}
  	} else {
  		prtnframe = precv_frame;
  	}
  
  
  		return prtnframe;
  }
  
  static int recv_decache(struct recv_frame *precv_frame, u8 bretry,
  			struct stainfo_rxcache *prxcache)
  {
  	int tid = precv_frame->attrib.priority;
  
  	u16 seq_ctrl = ((precv_frame->attrib.seq_num&0xffff) << 4) |
  		(precv_frame->attrib.frag_num & 0xf);
  
  
  	if (tid > 15) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("recv_decache, (tid>15)! seq_ctrl=0x%x, tid=0x%x\n", seq_ctrl, tid));
  
  		return _FAIL;
  	}
  
  	if (1) {/* if (bretry) */
  		if (seq_ctrl == prxcache->tid_rxseq[tid]) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("recv_decache, seq_ctrl=0x%x, tid=0x%x, tid_rxseq=0x%x\n", seq_ctrl, tid, prxcache->tid_rxseq[tid]));
  
  			return _FAIL;
  		}
  	}
  
  	prxcache->tid_rxseq[tid] = seq_ctrl;
  
  
  	return _SUCCESS;
  }
  
  static void process_pwrbit_data(struct adapter *padapter,
  				struct recv_frame *precv_frame)
  {
  #ifdef CONFIG_88EU_AP_MODE
  	unsigned char pwrbit;
  	u8 *ptr = precv_frame->rx_data;
  	struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
  	struct sta_priv *pstapriv = &padapter->stapriv;
  	struct sta_info *psta = NULL;
  
  	psta = rtw_get_stainfo(pstapriv, pattrib->src);
  
  	pwrbit = GetPwrMgt(ptr);
  
  	if (psta) {
  		if (pwrbit) {
  			if (!(psta->state & WIFI_SLEEP_STATE))
  				stop_sta_xmit(padapter, psta);
  		} else {
  			if (psta->state & WIFI_SLEEP_STATE)
  				wakeup_sta_to_xmit(padapter, psta);
  		}
  	}
  
  #endif
  }
  
  static void process_wmmps_data(struct adapter *padapter,
  			       struct recv_frame *precv_frame)
  {
  #ifdef CONFIG_88EU_AP_MODE
  	struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
  	struct sta_priv *pstapriv = &padapter->stapriv;
  	struct sta_info *psta = NULL;
  
  	psta = rtw_get_stainfo(pstapriv, pattrib->src);
  
  	if (!psta)
  		return;
  
  	if (!psta->qos_option)
  		return;
  
  	if (!(psta->qos_info&0xf))
  		return;
  
  	if (psta->state&WIFI_SLEEP_STATE) {
  		u8 wmmps_ac = 0;
  
  		switch (pattrib->priority) {
  		case 1:
  		case 2:
  			wmmps_ac = psta->uapsd_bk&BIT(1);
  			break;
  		case 4:
  		case 5:
  			wmmps_ac = psta->uapsd_vi&BIT(1);
  			break;
  		case 6:
  		case 7:
  			wmmps_ac = psta->uapsd_vo&BIT(1);
  			break;
  		case 0:
  		case 3:
  		default:
  			wmmps_ac = psta->uapsd_be&BIT(1);
  			break;
  		}
  
  		if (wmmps_ac) {
  			if (psta->sleepq_ac_len > 0) {
  				/* process received triggered frame */
  				xmit_delivery_enabled_frames(padapter, psta);
  			} else {
  				/* issue one qos null frame with More data bit = 0 and the EOSP bit set (= 1) */
  				issue_qos_nulldata(padapter, psta->hwaddr, (u16)pattrib->priority, 0, 0);
  			}
  		}
  	}
  
  #endif
  }
  
  static void count_rx_stats(struct adapter *padapter,
  			   struct recv_frame *prframe,
  			   struct sta_info *sta)
  {
  	int	sz;
  	struct sta_info		*psta = NULL;
  	struct stainfo_stats	*pstats = NULL;
  	struct rx_pkt_attrib	*pattrib = &prframe->attrib;
  	struct recv_priv	*precvpriv = &padapter->recvpriv;
  
  	sz = prframe->len;
  	precvpriv->rx_bytes += sz;
  
  	padapter->mlmepriv.LinkDetectInfo.NumRxOkInPeriod++;
  
  	if ((!MacAddr_isBcst(pattrib->dst)) && (!IS_MCAST(pattrib->dst)))
  		padapter->mlmepriv.LinkDetectInfo.NumRxUnicastOkInPeriod++;
  
  	if (sta)
  		psta = sta;
  	else
  		psta = prframe->psta;
  
  	if (psta) {
  		pstats = &psta->sta_stats;
  
  		pstats->rx_data_pkts++;
  		pstats->rx_bytes += sz;
  	}
  }
  
  int sta2sta_data_frame(
  	struct adapter *adapter,
  	struct recv_frame *precv_frame,
  	struct sta_info **psta
  );
  
  int sta2sta_data_frame(struct adapter *adapter, struct recv_frame *precv_frame,
  		       struct sta_info **psta)
  {
  	u8 *ptr = precv_frame->rx_data;
  	int ret = _SUCCESS;
  	struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
  	struct	sta_priv *pstapriv = &adapter->stapriv;
  	struct	mlme_priv *pmlmepriv = &adapter->mlmepriv;
  	u8 *mybssid  = get_bssid(pmlmepriv);
  	u8 *myhwaddr = myid(&adapter->eeprompriv);
  	u8 *sta_addr = NULL;
  	int bmcast = IS_MCAST(pattrib->dst);
  
  
  	if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true) ||
  	    (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE) == true)) {
  		/*  filter packets that SA is myself or multicast or broadcast */
  		if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN)) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" SA==myself\n"));
  			ret = _FAIL;
  			goto exit;
  		}
  
  		if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast)) {
  			ret = _FAIL;
  			goto exit;
  		}
  
  		if (!memcmp(pattrib->bssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
  		    !memcmp(mybssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
  		    memcmp(pattrib->bssid, mybssid, ETH_ALEN)) {
  			ret = _FAIL;
  			goto exit;
  		}
  
  		sta_addr = pattrib->src;
  	} else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
  		/*  For Station mode, sa and bssid should always be BSSID, and DA is my mac-address */
  		if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN)) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("bssid!=TA under STATION_MODE; drop pkt\n"));
  			ret = _FAIL;
  			goto exit;
  		}
  		sta_addr = pattrib->bssid;
  	} else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
  		if (bmcast) {
  			/*  For AP mode, if DA == MCAST, then BSSID should be also MCAST */
  			if (!IS_MCAST(pattrib->bssid)) {
  					ret = _FAIL;
  					goto exit;
  			}
  		} else { /*  not mc-frame */
  			/*  For AP mode, if DA is non-MCAST, then it must be BSSID, and bssid == BSSID */
  			if (memcmp(pattrib->bssid, pattrib->dst, ETH_ALEN)) {
  				ret = _FAIL;
  				goto exit;
  			}
  
  			sta_addr = pattrib->src;
  		}
  	} else if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
  		memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
  		memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
  		memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
  		memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
  		memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
  
  		sta_addr = mybssid;
  	} else {
  		ret  = _FAIL;
  	}
  
  	if (bmcast)
  		*psta = rtw_get_bcmc_stainfo(adapter);
  	else
  		*psta = rtw_get_stainfo(pstapriv, sta_addr); /*  get ap_info */
  
  	if (*psta == NULL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("can't get psta under sta2sta_data_frame ; drop pkt\n"));
  		ret = _FAIL;
  		goto exit;
  	}
  
  exit:
  	return ret;
  }
  
  static int ap2sta_data_frame(
  	struct adapter *adapter,
  	struct recv_frame *precv_frame,
  	struct sta_info **psta)
  {
  	u8 *ptr = precv_frame->rx_data;
  	struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
  	int ret = _SUCCESS;
  	struct	sta_priv *pstapriv = &adapter->stapriv;
  	struct	mlme_priv *pmlmepriv = &adapter->mlmepriv;
  	u8 *mybssid  = get_bssid(pmlmepriv);
  	u8 *myhwaddr = myid(&adapter->eeprompriv);
  	int bmcast = IS_MCAST(pattrib->dst);
  
  
  	if ((check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true) &&
  	    (check_fwstate(pmlmepriv, _FW_LINKED) == true ||
  	    check_fwstate(pmlmepriv, _FW_UNDER_LINKING))) {
  		/*  filter packets that SA is myself or multicast or broadcast */
  		if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN)) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" SA==myself\n"));
  			ret = _FAIL;
  			goto exit;
  		}
  
  		/*  da should be for me */
  		if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast)) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
  				 (" ap2sta_data_frame:  compare DA fail; DA=%pM\n", (pattrib->dst)));
  			ret = _FAIL;
  			goto exit;
  		}
  
  		/*  check BSSID */
  		if (!memcmp(pattrib->bssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
  		    !memcmp(mybssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
  		     (memcmp(pattrib->bssid, mybssid, ETH_ALEN))) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
  				 (" ap2sta_data_frame:  compare BSSID fail ; BSSID=%pM\n", (pattrib->bssid)));
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("mybssid=%pM\n", (mybssid)));
  
  			if (!bmcast) {
  				DBG_88E("issue_deauth to the nonassociated ap=%pM for the reason(7)\n", (pattrib->bssid));
  				issue_deauth(adapter, pattrib->bssid, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
  			}
  
  			ret = _FAIL;
  			goto exit;
  		}
  
  		if (bmcast)
  			*psta = rtw_get_bcmc_stainfo(adapter);
  		else
  			*psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get ap_info */
  
  		if (*psta == NULL) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("ap2sta: can't get psta under STATION_MODE ; drop pkt\n"));
  			ret = _FAIL;
  			goto exit;
  		}
  
  		/* if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) == WIFI_QOS_DATA_TYPE) { */
  		/*  */
  
  		if (GetFrameSubType(ptr) & BIT(6)) {
  			/* No data, will not indicate to upper layer, temporily count it here */
  			count_rx_stats(adapter, precv_frame, *psta);
  			ret = RTW_RX_HANDLED;
  			goto exit;
  		}
  	} else if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) &&
  		   (check_fwstate(pmlmepriv, _FW_LINKED) == true)) {
  		memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
  		memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
  		memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
  		memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
  		memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
  
  		/*  */
  		memcpy(pattrib->bssid,  mybssid, ETH_ALEN);
  
  		*psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get sta_info */
  		if (*psta == NULL) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("can't get psta under MP_MODE ; drop pkt\n"));
  			ret = _FAIL;
  			goto exit;
  		}
  	} else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
  		/* Special case */
  		ret = RTW_RX_HANDLED;
  		goto exit;
  	} else {
  		if (!memcmp(myhwaddr, pattrib->dst, ETH_ALEN) && (!bmcast)) {
  			*psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get sta_info */
  			if (*psta == NULL) {
  				DBG_88E("issue_deauth to the ap =%pM for the reason(7)\n", (pattrib->bssid));
  
  				issue_deauth(adapter, pattrib->bssid, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
  			}
  		}
  
  		ret = _FAIL;
  	}
  
  exit:
  
  
  	return ret;
  }
  
  static int sta2ap_data_frame(struct adapter *adapter,
  			     struct recv_frame *precv_frame,
  			     struct sta_info **psta)
  {
  	struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
  	struct	sta_priv *pstapriv = &adapter->stapriv;
  	struct	mlme_priv *pmlmepriv = &adapter->mlmepriv;
  	u8 *ptr = precv_frame->rx_data;
  	unsigned char *mybssid  = get_bssid(pmlmepriv);
  	int ret = _SUCCESS;
  
  
  	if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
  		/* For AP mode, RA = BSSID, TX = STA(SRC_ADDR), A3 = DST_ADDR */
  		if (memcmp(pattrib->bssid, mybssid, ETH_ALEN)) {
  			ret = _FAIL;
  			goto exit;
  		}
  
  		*psta = rtw_get_stainfo(pstapriv, pattrib->src);
  		if (*psta == NULL) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("can't get psta under AP_MODE; drop pkt\n"));
  			DBG_88E("issue_deauth to sta=%pM for the reason(7)\n", (pattrib->src));
  
  			issue_deauth(adapter, pattrib->src, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
  
  			ret = RTW_RX_HANDLED;
  			goto exit;
  		}
  
  		process_pwrbit_data(adapter, precv_frame);
  
  		if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) == WIFI_QOS_DATA_TYPE) {
  			process_wmmps_data(adapter, precv_frame);
  		}
  
  		if (GetFrameSubType(ptr) & BIT(6)) {
  			/* No data, will not indicate to upper layer, temporily count it here */
  			count_rx_stats(adapter, precv_frame, *psta);
  			ret = RTW_RX_HANDLED;
  			goto exit;
  		}
  	} else {
  		u8 *myhwaddr = myid(&adapter->eeprompriv);
  		if (memcmp(pattrib->ra, myhwaddr, ETH_ALEN)) {
  			ret = RTW_RX_HANDLED;
  			goto exit;
  		}
  		DBG_88E("issue_deauth to sta=%pM for the reason(7)\n", (pattrib->src));
  		issue_deauth(adapter, pattrib->src, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
  		ret = RTW_RX_HANDLED;
  		goto exit;
  	}
  
  exit:
  
  
  	return ret;
  }
  
  static int validate_recv_ctrl_frame(struct adapter *padapter,
  				    struct recv_frame *precv_frame)
  {
  #ifdef CONFIG_88EU_AP_MODE
  	struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
  	struct sta_priv *pstapriv = &padapter->stapriv;
  	u8 *pframe = precv_frame->rx_data;
  
  	if (GetFrameType(pframe) != WIFI_CTRL_TYPE)
  		return _FAIL;
  
  	/* receive the frames that ra(a1) is my address */
  	if (memcmp(GetAddr1Ptr(pframe), myid(&padapter->eeprompriv), ETH_ALEN))
  		return _FAIL;
  
  	/* only handle ps-poll */
  	if (GetFrameSubType(pframe) == WIFI_PSPOLL) {
  		u16 aid;
  		u8 wmmps_ac = 0;
  		struct sta_info *psta = NULL;
  
  		aid = GetAid(pframe);
  		psta = rtw_get_stainfo(pstapriv, GetAddr2Ptr(pframe));
  
  		if ((psta == NULL) || (psta->aid != aid))
  			return _FAIL;
  
  		/* for rx pkt statistics */
  		psta->sta_stats.rx_ctrl_pkts++;
  
  		switch (pattrib->priority) {
  		case 1:
  		case 2:
  			wmmps_ac = psta->uapsd_bk&BIT(0);
  			break;
  		case 4:
  		case 5:
  			wmmps_ac = psta->uapsd_vi&BIT(0);
  			break;
  		case 6:
  		case 7:
  			wmmps_ac = psta->uapsd_vo&BIT(0);
  			break;
  		case 0:
  		case 3:
  		default:
  			wmmps_ac = psta->uapsd_be&BIT(0);
  			break;
  		}
  
  		if (wmmps_ac)
  			return _FAIL;
  
  		if (psta->state & WIFI_STA_ALIVE_CHK_STATE) {
  			DBG_88E("%s alive check-rx ps-poll\n", __func__);
  			psta->expire_to = pstapriv->expire_to;
  			psta->state ^= WIFI_STA_ALIVE_CHK_STATE;
  		}
  
  		if ((psta->state&WIFI_SLEEP_STATE) && (pstapriv->sta_dz_bitmap&BIT(psta->aid))) {
  			struct list_head *xmitframe_plist, *xmitframe_phead;
  			struct xmit_frame *pxmitframe = NULL;
  
  			spin_lock_bh(&psta->sleep_q.lock);
  
  			xmitframe_phead = get_list_head(&psta->sleep_q);
  			xmitframe_plist = xmitframe_phead->next;
  
  			if (xmitframe_phead != xmitframe_plist) {
  				pxmitframe = container_of(xmitframe_plist, struct xmit_frame, list);
  
  				xmitframe_plist = xmitframe_plist->next;
  
  				list_del_init(&pxmitframe->list);
  
  				psta->sleepq_len--;
  
  				if (psta->sleepq_len > 0)
  					pxmitframe->attrib.mdata = 1;
  				else
  					pxmitframe->attrib.mdata = 0;
  
  				pxmitframe->attrib.triggered = 1;
  
  				spin_unlock_bh(&psta->sleep_q.lock);
  				if (rtw_hal_xmit(padapter, pxmitframe) == true)
  					rtw_os_xmit_complete(padapter, pxmitframe);
  				spin_lock_bh(&psta->sleep_q.lock);
  
  				if (psta->sleepq_len == 0) {
  					pstapriv->tim_bitmap &= ~BIT(psta->aid);
  
  					/* update BCN for TIM IE */
  					/* update_BCNTIM(padapter); */
  					update_beacon(padapter, _TIM_IE_, NULL, false);
  				}
  			} else {
  				if (pstapriv->tim_bitmap&BIT(psta->aid)) {
  					if (psta->sleepq_len == 0) {
  						DBG_88E("no buffered packets to xmit\n");
  
  						/* issue nulldata with More data bit = 0 to indicate we have no buffered packets */
  						issue_nulldata(padapter, psta->hwaddr, 0, 0, 0);
  					} else {
  						DBG_88E("error!psta->sleepq_len=%d\n", psta->sleepq_len);
  						psta->sleepq_len = 0;
  					}
  
  					pstapriv->tim_bitmap &= ~BIT(psta->aid);
  
  					/* update BCN for TIM IE */
  					/* update_BCNTIM(padapter); */
  					update_beacon(padapter, _TIM_IE_, NULL, false);
  				}
  			}
  
  			spin_unlock_bh(&psta->sleep_q.lock);
  		}
  	}
  
  #endif
  
  	return _FAIL;
  }
  
  struct recv_frame *recvframe_chk_defrag(struct adapter *padapter,
  					struct recv_frame *precv_frame);
  
  static int validate_recv_mgnt_frame(struct adapter *padapter,
  				    struct recv_frame *precv_frame)
  {
  	struct sta_info *psta;
  
  	RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("+validate_recv_mgnt_frame\n"));
  
  	precv_frame = recvframe_chk_defrag(padapter, precv_frame);
  	if (precv_frame == NULL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("%s: fragment packet\n", __func__));
  		return _SUCCESS;
  	}
  
  	/* for rx pkt statistics */
  	psta = rtw_get_stainfo(&padapter->stapriv,
  			       GetAddr2Ptr(precv_frame->rx_data));
  	if (psta) {
  		psta->sta_stats.rx_mgnt_pkts++;
  		if (GetFrameSubType(precv_frame->rx_data) == WIFI_BEACON) {
  			psta->sta_stats.rx_beacon_pkts++;
  		} else if (GetFrameSubType(precv_frame->rx_data) == WIFI_PROBEREQ) {
  			psta->sta_stats.rx_probereq_pkts++;
  		} else if (GetFrameSubType(precv_frame->rx_data) == WIFI_PROBERSP) {
  			if (!memcmp(padapter->eeprompriv.mac_addr,
  				    GetAddr1Ptr(precv_frame->rx_data), ETH_ALEN))
  				psta->sta_stats.rx_probersp_pkts++;
  			else if (is_broadcast_mac_addr(GetAddr1Ptr(precv_frame->rx_data)) ||
  				 is_multicast_mac_addr(GetAddr1Ptr(precv_frame->rx_data)))
  				psta->sta_stats.rx_probersp_bm_pkts++;
  			else
  				psta->sta_stats.rx_probersp_uo_pkts++;
  		}
  	}
  
  	mgt_dispatcher(padapter, precv_frame);
  
  	return _SUCCESS;
  }
  
  static int validate_recv_data_frame(struct adapter *adapter,
  				    struct recv_frame *precv_frame)
  {
  	u8 bretry;
  	u8 *psa, *pda, *pbssid;
  	struct sta_info *psta = NULL;
  	u8 *ptr = precv_frame->rx_data;
  	struct rx_pkt_attrib	*pattrib = &precv_frame->attrib;
  	struct security_priv	*psecuritypriv = &adapter->securitypriv;
  	int ret = _SUCCESS;
  
  
  	bretry = GetRetry(ptr);
  	pda = get_da(ptr);
  	psa = get_sa(ptr);
  	pbssid = get_hdr_bssid(ptr);
  
  	if (pbssid == NULL) {
  		ret = _FAIL;
  		goto exit;
  	}
  
  	memcpy(pattrib->dst, pda, ETH_ALEN);
  	memcpy(pattrib->src, psa, ETH_ALEN);
  
  	memcpy(pattrib->bssid, pbssid, ETH_ALEN);
  
  	switch (pattrib->to_fr_ds) {
  	case 0:
  		memcpy(pattrib->ra, pda, ETH_ALEN);
  		memcpy(pattrib->ta, psa, ETH_ALEN);
  		ret = sta2sta_data_frame(adapter, precv_frame, &psta);
  		break;
  	case 1:
  		memcpy(pattrib->ra, pda, ETH_ALEN);
  		memcpy(pattrib->ta, pbssid, ETH_ALEN);
  		ret = ap2sta_data_frame(adapter, precv_frame, &psta);
  		break;
  	case 2:
  		memcpy(pattrib->ra, pbssid, ETH_ALEN);
  		memcpy(pattrib->ta, psa, ETH_ALEN);
  		ret = sta2ap_data_frame(adapter, precv_frame, &psta);
  		break;
  	case 3:
  		memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
  		memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
  		ret = _FAIL;
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" case 3\n"));
  		break;
  	default:
  		ret = _FAIL;
  		break;
  	}
  
  	if (ret == _FAIL) {
  		goto exit;
  	} else if (ret == RTW_RX_HANDLED) {
  		goto exit;
  	}
  
  	if (psta == NULL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" after to_fr_ds_chk; psta==NULL\n"));
  		ret = _FAIL;
  		goto exit;
  	}
  
  	/* psta->rssi = prxcmd->rssi; */
  	/* psta->signal_quality = prxcmd->sq; */
  	precv_frame->psta = psta;
  
  	pattrib->amsdu = 0;
  	pattrib->ack_policy = 0;
  	/* parsing QC field */
  	if (pattrib->qos == 1) {
  		pattrib->priority = GetPriority((ptr + 24));
  		pattrib->ack_policy = GetAckpolicy((ptr + 24));
  		pattrib->amsdu = GetAMsdu((ptr + 24));
  		pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 32 : 26;
  
  		if (pattrib->priority != 0 && pattrib->priority != 3)
  			adapter->recvpriv.bIsAnyNonBEPkts = true;
  	} else {
  		pattrib->priority = 0;
  		pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 30 : 24;
  	}
  
  	if (pattrib->order)/* HT-CTRL 11n */
  		pattrib->hdrlen += 4;
  
  	precv_frame->preorder_ctrl = &psta->recvreorder_ctrl[pattrib->priority];
  
  	/*  decache, drop duplicate recv packets */
  	if (recv_decache(precv_frame, bretry, &psta->sta_recvpriv.rxcache) == _FAIL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("decache : drop pkt\n"));
  		ret = _FAIL;
  		goto exit;
  	}
  
  	if (pattrib->privacy) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("validate_recv_data_frame:pattrib->privacy=%x\n", pattrib->privacy));
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n ^^^^^^^^^^^IS_MCAST(pattrib->ra(0x%02x))=%d^^^^^^^^^^^^^^^6\n", pattrib->ra[0], IS_MCAST(pattrib->ra)));
  
  		GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt, IS_MCAST(pattrib->ra));
  
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n pattrib->encrypt=%d\n", pattrib->encrypt));
  
  		SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len, pattrib->encrypt);
  	} else {
  		pattrib->encrypt = 0;
  		pattrib->iv_len = 0;
  		pattrib->icv_len = 0;
  	}
  
  exit:
  
  
  	return ret;
  }
  
  static int validate_recv_frame(struct adapter *adapter,
  			       struct recv_frame *precv_frame)
  {
  	/* shall check frame subtype, to / from ds, da, bssid */
  
  	/* then call check if rx seq/frag. duplicated. */
  
  	u8 type;
  	u8 subtype;
  	int retval = _SUCCESS;
  	u8 bDumpRxPkt;
  	struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
  	u8 *ptr = precv_frame->rx_data;
  	u8  ver = (unsigned char)(*ptr)&0x3;
  	struct mlme_ext_priv *pmlmeext = &adapter->mlmeextpriv;
  
  
  	if (pmlmeext->sitesurvey_res.state == SCAN_PROCESS) {
  		int ch_set_idx = rtw_ch_set_search_ch(pmlmeext->channel_set, rtw_get_oper_ch(adapter));
  		if (ch_set_idx >= 0)
  			pmlmeext->channel_set[ch_set_idx].rx_count++;
  	}
  
  	/* add version chk */
  	if (ver != 0) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_data_frame fail! (ver!=0)\n"));
  		retval = _FAIL;
  		goto exit;
  	}
  
  	type =  GetFrameType(ptr);
  	subtype = GetFrameSubType(ptr); /* bit(7)~bit(2) */
  
  	pattrib->to_fr_ds = get_tofr_ds(ptr);
  
  	pattrib->frag_num = GetFragNum(ptr);
  	pattrib->seq_num = GetSequence(ptr);
  
  	pattrib->pw_save = GetPwrMgt(ptr);
  	pattrib->mfrag = GetMFrag(ptr);
  	pattrib->mdata = GetMData(ptr);
  	pattrib->privacy = GetPrivacy(ptr);
  	pattrib->order = GetOrder(ptr);
  
  	/* Dump rx packets */
  	rtw_hal_get_def_var(adapter, HAL_DEF_DBG_DUMP_RXPKT, &(bDumpRxPkt));
  	if (bDumpRxPkt == 1) {/* dump all rx packets */
  		int i;
  		DBG_88E("#############################\n");
  
  		for (i = 0; i < 64; i = i+8)
  			DBG_88E("%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:\n", *(ptr+i),
  				*(ptr+i+1), *(ptr+i+2), *(ptr+i+3), *(ptr+i+4), *(ptr+i+5), *(ptr+i+6), *(ptr+i+7));
  		DBG_88E("#############################\n");
  	} else if (bDumpRxPkt == 2) {
  		if (type == WIFI_MGT_TYPE) {
  			int i;
  			DBG_88E("#############################\n");
  
  			for (i = 0; i < 64; i = i+8)
  				DBG_88E("%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:\n", *(ptr+i),
  					*(ptr+i+1), *(ptr+i+2), *(ptr+i+3), *(ptr+i+4), *(ptr+i+5), *(ptr+i+6), *(ptr+i+7));
  			DBG_88E("#############################\n");
  		}
  	} else if (bDumpRxPkt == 3) {
  		if (type == WIFI_DATA_TYPE) {
  			int i;
  			DBG_88E("#############################\n");
  
  			for (i = 0; i < 64; i = i+8)
  				DBG_88E("%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:\n", *(ptr+i),
  					*(ptr+i+1), *(ptr+i+2), *(ptr+i+3), *(ptr+i+4), *(ptr+i+5), *(ptr+i+6), *(ptr+i+7));
  			DBG_88E("#############################\n");
  		}
  	}
  	switch (type) {
  	case WIFI_MGT_TYPE: /* mgnt */
  		retval = validate_recv_mgnt_frame(adapter, precv_frame);
  		if (retval == _FAIL)
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_mgnt_frame fail\n"));
  		retval = _FAIL; /*  only data frame return _SUCCESS */
  		break;
  	case WIFI_CTRL_TYPE: /* ctrl */
  		retval = validate_recv_ctrl_frame(adapter, precv_frame);
  		if (retval == _FAIL)
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_ctrl_frame fail\n"));
  		retval = _FAIL; /*  only data frame return _SUCCESS */
  		break;
  	case WIFI_DATA_TYPE: /* data */
  		rtw_led_control(adapter, LED_CTL_RX);
  		pattrib->qos = (subtype & BIT(7)) ? 1 : 0;
  		retval = validate_recv_data_frame(adapter, precv_frame);
  		if (retval == _FAIL) {
  			struct recv_priv *precvpriv = &adapter->recvpriv;
  			precvpriv->rx_drop++;
  		}
  		break;
  	default:
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_data_frame fail! type= 0x%x\n", type));
  		retval = _FAIL;
  		break;
  	}
  
  exit:
  
  
  	return retval;
  }
  
  /* remove the wlanhdr and add the eth_hdr */
  
  static int wlanhdr_to_ethhdr(struct recv_frame *precvframe)
  {
  	int	rmv_len;
  	u16	eth_type, len;
  	__be16 be_tmp;
  	u8	bsnaphdr;
  	u8	*psnap_type;
  	struct ieee80211_snap_hdr	*psnap;
  
  	struct adapter		*adapter = precvframe->adapter;
  	struct mlme_priv	*pmlmepriv = &adapter->mlmepriv;
  	u8 *ptr = precvframe->rx_data;
  	struct rx_pkt_attrib *pattrib = &precvframe->attrib;
  
  	if (pattrib->encrypt)
  		recvframe_pull_tail(precvframe, pattrib->icv_len);
  
  	psnap = (struct ieee80211_snap_hdr *)(ptr+pattrib->hdrlen + pattrib->iv_len);
  	psnap_type = ptr+pattrib->hdrlen + pattrib->iv_len+SNAP_SIZE;
  	/* convert hdr + possible LLC headers into Ethernet header */
  	if ((!memcmp(psnap, rtw_rfc1042_header, SNAP_SIZE) &&
  	     (!memcmp(psnap_type, SNAP_ETH_TYPE_IPX, 2) == false) &&
  	     (!memcmp(psnap_type, SNAP_ETH_TYPE_APPLETALK_AARP, 2) == false)) ||
  	     !memcmp(psnap, rtw_bridge_tunnel_header, SNAP_SIZE)) {
  		/* remove RFC1042 or Bridge-Tunnel encapsulation and replace EtherType */
  		bsnaphdr = true;
  	} else {
  		/* Leave Ethernet header part of hdr and full payload */
  		bsnaphdr = false;
  	}
  
  	rmv_len = pattrib->hdrlen + pattrib->iv_len + (bsnaphdr ? SNAP_SIZE : 0);
  	len = precvframe->len - rmv_len;
  
  	RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
  		 ("\n===pattrib->hdrlen: %x,  pattrib->iv_len:%x===\n\n", pattrib->hdrlen,  pattrib->iv_len));
  
  	memcpy(&be_tmp, ptr+rmv_len, 2);
  	eth_type = ntohs(be_tmp); /* pattrib->ether_type */
  	pattrib->eth_type = eth_type;
  
  	if ((check_fwstate(pmlmepriv, WIFI_MP_STATE))) {
  		ptr += rmv_len;
  		*ptr = 0x87;
  		*(ptr+1) = 0x12;
  
  		eth_type = 0x8712;
  		/*  append rx status for mp test packets */
  		ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr)+2)-24);
  		memcpy(ptr, get_rxmem(precvframe), 24);
  		ptr += 24;
  	} else {
  		ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0)));
  	}
  
  	memcpy(ptr, pattrib->dst, ETH_ALEN);
  	memcpy(ptr+ETH_ALEN, pattrib->src, ETH_ALEN);
  
  	if (!bsnaphdr) {
  		be_tmp = htons(len);
  		memcpy(ptr+12, &be_tmp, 2);
  	}
  
  	return _SUCCESS;
  }
  
  /* perform defrag */
  static struct recv_frame *recvframe_defrag(struct adapter *adapter,
  					   struct __queue *defrag_q)
  {
  	struct list_head *plist, *phead;
  	u8 wlanhdr_offset;
  	u8	curfragnum;
  	struct recv_frame *pfhdr, *pnfhdr;
  	struct recv_frame *prframe, *pnextrframe;
  	struct __queue *pfree_recv_queue;
  
  
  	curfragnum = 0;
  	pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
  
  	phead = get_list_head(defrag_q);
  	plist = phead->next;
  	pfhdr = container_of(plist, struct recv_frame, list);
  	prframe = (struct recv_frame *)pfhdr;
  	list_del_init(&(prframe->list));
  
  	if (curfragnum != pfhdr->attrib.frag_num) {
  		/* the first fragment number must be 0 */
  		/* free the whole queue */
  		rtw_free_recvframe(prframe, pfree_recv_queue);
  		rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);
  
  		return NULL;
  	}
  
  	curfragnum++;
  
  	plist = get_list_head(defrag_q);
  
  	plist = plist->next;
  
  	while (phead != plist) {
  		pnfhdr = container_of(plist, struct recv_frame, list);
  		pnextrframe = (struct recv_frame *)pnfhdr;
  
  		/* check the fragment sequence  (2nd ~n fragment frame) */
  
  		if (curfragnum != pnfhdr->attrib.frag_num) {
  			/* the fragment number must be increasing  (after decache) */
  			/* release the defrag_q & prframe */
  			rtw_free_recvframe(prframe, pfree_recv_queue);
  			rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);
  			return NULL;
  		}
  
  		curfragnum++;
  
  		/* copy the 2nd~n fragment frame's payload to the first fragment */
  		/* get the 2nd~last fragment frame's payload */
  
  		wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
  
  		recvframe_pull(pnextrframe, wlanhdr_offset);
  
  		/* append  to first fragment frame's tail (if privacy frame, pull the ICV) */
  		recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
  
  		/* memcpy */
  		memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
  
  		recvframe_put(prframe, pnfhdr->len);
  
  		pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
  		plist = plist->next;
  	}
  
  	/* free the defrag_q queue and return the prframe */
  	rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);
  
  	RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("Performance defrag!!!!!\n"));
  
  
  	return prframe;
  }
  
  /* check if need to defrag, if needed queue the frame to defrag_q */
  struct recv_frame *recvframe_chk_defrag(struct adapter *padapter,
  					struct recv_frame *precv_frame)
  {
  	u8	ismfrag;
  	u8	fragnum;
  	u8	*psta_addr;
  	struct recv_frame *pfhdr;
  	struct sta_info *psta;
  	struct sta_priv *pstapriv;
  	struct list_head *phead;
  	struct recv_frame *prtnframe = NULL;
  	struct __queue *pfree_recv_queue, *pdefrag_q;
  
  
  	pstapriv = &padapter->stapriv;
  
  	pfhdr = precv_frame;
  
  	pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
  
  	/* need to define struct of wlan header frame ctrl */
  	ismfrag = pfhdr->attrib.mfrag;
  	fragnum = pfhdr->attrib.frag_num;
  
  	psta_addr = pfhdr->attrib.ta;
  	psta = rtw_get_stainfo(pstapriv, psta_addr);
  	if (psta == NULL) {
  		u8 type = GetFrameType(pfhdr->rx_data);
  		if (type != WIFI_DATA_TYPE) {
  			psta = rtw_get_bcmc_stainfo(padapter);
  			pdefrag_q = &psta->sta_recvpriv.defrag_q;
  		} else {
  			pdefrag_q = NULL;
  		}
  	} else {
  		pdefrag_q = &psta->sta_recvpriv.defrag_q;
  	}
  
  	if ((ismfrag == 0) && (fragnum == 0))
  		prtnframe = precv_frame;/* isn't a fragment frame */
  
  	if (ismfrag == 1) {
  		/* 0~(n-1) fragment frame */
  		/* enqueue to defraf_g */
  		if (pdefrag_q != NULL) {
  			if (fragnum == 0) {
  				/* the first fragment */
  				if (!list_empty(&pdefrag_q->queue)) {
  					/* free current defrag_q */
  					rtw_free_recvframe_queue(pdefrag_q, pfree_recv_queue);
  				}
  			}
  
  			/* Then enqueue the 0~(n-1) fragment into the defrag_q */
  
  			phead = get_list_head(pdefrag_q);
  			list_add_tail(&pfhdr->list, phead);
  
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("Enqueuq: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));
  
  			prtnframe = NULL;
  		} else {
  			/* can't find this ta's defrag_queue, so free this recv_frame */
  			rtw_free_recvframe(precv_frame, pfree_recv_queue);
  			prtnframe = NULL;
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("Free because pdefrag_q==NULL: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));
  		}
  	}
  
  	if ((ismfrag == 0) && (fragnum != 0)) {
  		/* the last fragment frame */
  		/* enqueue the last fragment */
  		if (pdefrag_q != NULL) {
  			phead = get_list_head(pdefrag_q);
  			list_add_tail(&pfhdr->list, phead);
  
  			/* call recvframe_defrag to defrag */
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("defrag: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));
  			precv_frame = recvframe_defrag(padapter, pdefrag_q);
  			prtnframe = precv_frame;
  		} else {
  			/* can't find this ta's defrag_queue, so free this recv_frame */
  			rtw_free_recvframe(precv_frame, pfree_recv_queue);
  			prtnframe = NULL;
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("Free because pdefrag_q==NULL: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));
  		}
  	}
  
  	if ((prtnframe != NULL) && (prtnframe->attrib.privacy)) {
  		/* after defrag we must check tkip mic code */
  		if (recvframe_chkmic(padapter,  prtnframe) == _FAIL) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recvframe_chkmic(padapter,  prtnframe)==_FAIL\n"));
  			rtw_free_recvframe(prtnframe, pfree_recv_queue);
  			prtnframe = NULL;
  		}
  	}
  
  
  	return prtnframe;
  }
  
  static int amsdu_to_msdu(struct adapter *padapter, struct recv_frame *prframe)
  {
  	int	a_len, padding_len;
  	u16	eth_type, nSubframe_Length;
  	u8	nr_subframes, i;
  	unsigned char *pdata;
  	struct rx_pkt_attrib *pattrib;
  	unsigned char *data_ptr;
  	struct sk_buff *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  	struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
  	nr_subframes = 0;
  
  	pattrib = &prframe->attrib;
  
  	recvframe_pull(prframe, prframe->attrib.hdrlen);
  
  	if (prframe->attrib.iv_len > 0)
  		recvframe_pull(prframe, prframe->attrib.iv_len);
  
  	a_len = prframe->len;
  
  	pdata = prframe->rx_data;
  
  	while (a_len > ETH_HLEN) {
  		/* Offset 12 denote 2 mac address */
  		nSubframe_Length = get_unaligned_be16(pdata + 12);
  
  		if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
  			DBG_88E("nRemain_Length is %d and nSubframe_Length is : %d\n", a_len, nSubframe_Length);
  			goto exit;
  		}
  
  		/* move the data point to data content */
  		pdata += ETH_HLEN;
  		a_len -= ETH_HLEN;
  
  		/* Allocate new skb for releasing to upper layer */
  		sub_skb = dev_alloc_skb(nSubframe_Length + 12);
  		if (sub_skb) {
  			skb_reserve(sub_skb, 12);
  			data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
  			memcpy(data_ptr, pdata, nSubframe_Length);
  		} else {
  			sub_skb = skb_clone(prframe->pkt, GFP_ATOMIC);
  			if (sub_skb) {
  				sub_skb->data = pdata;
  				sub_skb->len = nSubframe_Length;
  				skb_set_tail_pointer(sub_skb, nSubframe_Length);
  			} else {
  				DBG_88E("skb_clone() Fail!!! , nr_subframes=%d\n", nr_subframes);
  				break;
  			}
  		}
  
  		subframes[nr_subframes++] = sub_skb;
  
  		if (nr_subframes >= MAX_SUBFRAME_COUNT) {
  			DBG_88E("ParseSubframe(): Too many Subframes! Packets dropped!\n");
  			break;
  		}
  
  		pdata += nSubframe_Length;
  		a_len -= nSubframe_Length;
  		if (a_len != 0) {
  			padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & (4-1));
  			if (padding_len == 4) {
  				padding_len = 0;
  			}
  
  			if (a_len < padding_len) {
  				goto exit;
  			}
  			pdata += padding_len;
  			a_len -= padding_len;
  		}
  	}
  
  	for (i = 0; i < nr_subframes; i++) {
  		sub_skb = subframes[i];
  		/* convert hdr + possible LLC headers into Ethernet header */
  		eth_type = get_unaligned_be16(&sub_skb->data[6]);
  		if (sub_skb->len >= 8 &&
  		    ((!memcmp(sub_skb->data, rtw_rfc1042_header, SNAP_SIZE) &&
  			  eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
  			 !memcmp(sub_skb->data, rtw_bridge_tunnel_header, SNAP_SIZE))) {
  			/* remove RFC1042 or Bridge-Tunnel encapsulation and replace EtherType */
  			skb_pull(sub_skb, SNAP_SIZE);
  			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, ETH_ALEN);
  			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, ETH_ALEN);
  		} else {
  			__be16 len;
  			/* Leave Ethernet header part of hdr and full payload */
  			len = htons(sub_skb->len);
  			memcpy(skb_push(sub_skb, 2), &len, 2);
  			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, ETH_ALEN);
  			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, ETH_ALEN);
  		}
  
  		/* Indicate the packets to upper layer */
  		/*  Insert NAT2.5 RX here! */
  		sub_skb->protocol = eth_type_trans(sub_skb, padapter->pnetdev);
  		sub_skb->dev = padapter->pnetdev;
  
  		sub_skb->ip_summed = CHECKSUM_NONE;
  
  		netif_rx(sub_skb);
  	}
  
  exit:
  
  	prframe->len = 0;
  	rtw_free_recvframe(prframe, pfree_recv_queue);/* free this recv_frame */
  
  	return _SUCCESS;
  }
  
  static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl, u16 seq_num)
  {
  	u8	wsize = preorder_ctrl->wsize_b;
  	u16	wend = (preorder_ctrl->indicate_seq + wsize - 1) & 0xFFF;/*  4096; */
  
  	/*  Rx Reorder initialize condition. */
  	if (preorder_ctrl->indicate_seq == 0xFFFF)
  		preorder_ctrl->indicate_seq = seq_num;
  
  	/*  Drop out the packet which SeqNum is smaller than WinStart */
  	if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
  		return false;
  
  	/*  */
  	/*  Sliding window manipulation. Conditions includes: */
  	/*  1. Incoming SeqNum is equal to WinStart =>Window shift 1 */
  	/*  2. Incoming SeqNum is larger than the WinEnd => Window shift N */
  	/*  */
  	if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq)) {
  		preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;
  	} else if (SN_LESS(wend, seq_num)) {
  		if (seq_num >= (wsize - 1))
  			preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
  		else
  			preorder_ctrl->indicate_seq = 0xFFF - (wsize - (seq_num + 1)) + 1;
  	}
  
  	return true;
  }
  
  static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
  				     struct recv_frame *prframe)
  {
  	struct rx_pkt_attrib *pattrib = &prframe->attrib;
  	struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;
  	struct list_head *phead, *plist;
  	struct recv_frame *hdr;
  	struct rx_pkt_attrib *pnextattrib;
  
  	phead = get_list_head(ppending_recvframe_queue);
  	plist = phead->next;
  
  	while (phead != plist) {
  		hdr = container_of(plist, struct recv_frame, list);
  		pnextattrib = &hdr->attrib;
  
  		if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
  			plist = plist->next;
  		else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
  			return false;
  		else
  			break;
  	}
  
  	list_del_init(&(prframe->list));
  
  	list_add_tail(&(prframe->list), plist);
  	return true;
  }
  
  static int recv_indicatepkts_in_order(struct adapter *padapter, struct recv_reorder_ctrl *preorder_ctrl, int bforced)
  {
  	struct list_head *phead, *plist;
  	struct recv_frame *prframe;
  	struct recv_frame *prhdr;
  	struct rx_pkt_attrib *pattrib;
  	int bPktInBuf = false;
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  	struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;
  
  	phead =		get_list_head(ppending_recvframe_queue);
  	plist = phead->next;
  
  	/*  Handling some condition for forced indicate case. */
  	if (bforced) {
  		if (list_empty(phead))
  			return true;
  
  		prhdr = container_of(plist, struct recv_frame, list);
  		pattrib = &prhdr->attrib;
  		preorder_ctrl->indicate_seq = pattrib->seq_num;
  	}
  
  	/*  Prepare indication list and indication. */
  	/*  Check if there is any packet need indicate. */
  	while (!list_empty(phead)) {
  		prhdr = container_of(plist, struct recv_frame, list);
  		prframe = (struct recv_frame *)prhdr;
  		pattrib = &prframe->attrib;
  
  		if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_,
  				 ("recv_indicatepkts_in_order: indicate=%d seq=%d amsdu=%d\n",
  				  preorder_ctrl->indicate_seq, pattrib->seq_num, pattrib->amsdu));
  			plist = plist->next;
  			list_del_init(&(prframe->list));
  
  			if (SN_EQUAL(preorder_ctrl->indicate_seq, pattrib->seq_num))
  				preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;
  
  			/* Set this as a lock to make sure that only one thread is indicating packet. */
  
  			/* indicate this recv_frame */
  			if (!pattrib->amsdu) {
  				if ((!padapter->bDriverStopped) &&
  				    (!padapter->bSurpriseRemoved))
  					rtw_recv_indicatepkt(padapter, prframe);/* indicate this recv_frame */
  			} else if (pattrib->amsdu == 1) {
  				if (amsdu_to_msdu(padapter, prframe) != _SUCCESS)
  					rtw_free_recvframe(prframe, &precvpriv->free_recv_queue);
  			} else {
  				/* error condition; */
  			}
  
  			/* Update local variables. */
  			bPktInBuf = false;
  		} else {
  			bPktInBuf = true;
  			break;
  		}
  	}
  	return bPktInBuf;
  }
  
  static int recv_indicatepkt_reorder(struct adapter *padapter,
  				    struct recv_frame *prframe)
  {
  	int retval = _SUCCESS;
  	struct rx_pkt_attrib *pattrib = &prframe->attrib;
  	struct recv_reorder_ctrl *preorder_ctrl = prframe->preorder_ctrl;
  	struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;
  
  	if (!pattrib->amsdu) {
  		/* s1. */
  		wlanhdr_to_ethhdr(prframe);
  
  		if ((pattrib->qos != 1) || (pattrib->eth_type == 0x0806) ||
  		    (pattrib->ack_policy != 0)) {
  			if ((!padapter->bDriverStopped) &&
  			    (!padapter->bSurpriseRemoved)) {
  				RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("@@@@  recv_indicatepkt_reorder -recv_func recv_indicatepkt\n"));
  
  				rtw_recv_indicatepkt(padapter, prframe);
  				return _SUCCESS;
  			}
  
  			return _FAIL;
  		}
  
  		if (!preorder_ctrl->enable) {
  			/* indicate this recv_frame */
  			preorder_ctrl->indicate_seq = pattrib->seq_num;
  			rtw_recv_indicatepkt(padapter, prframe);
  
  			preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1)%4096;
  			return _SUCCESS;
  		}
  	} else if (pattrib->amsdu == 1) { /* temp filter -> means didn't support A-MSDUs in a A-MPDU */
  		if (!preorder_ctrl->enable) {
  			preorder_ctrl->indicate_seq = pattrib->seq_num;
  			retval = amsdu_to_msdu(padapter, prframe);
  
  			preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1)%4096;
  			return retval;
  		}
  	}
  
  	spin_lock_bh(&ppending_recvframe_queue->lock);
  
  	RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_,
  		 ("recv_indicatepkt_reorder: indicate=%d seq=%d\n",
  		  preorder_ctrl->indicate_seq, pattrib->seq_num));
  
  	/* s2. check if winstart_b(indicate_seq) needs to been updated */
  	if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num)) {
  		rtw_recv_indicatepkt(padapter, prframe);
  
  		spin_unlock_bh(&ppending_recvframe_queue->lock);
  
  		goto _success_exit;
  	}
  
  	/* s3. Insert all packet into Reorder Queue to maintain its ordering. */
  	if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
  		goto _err_exit;
  
  	/* s4. */
  	/*  Indication process. */
  	/*  After Packet dropping and Sliding Window shifting as above, we can now just indicate the packets */
  	/*  with the SeqNum smaller than latest WinStart and buffer other packets. */
  	/*  */
  	/*  For Rx Reorder condition: */
  	/*  1. All packets with SeqNum smaller than WinStart => Indicate */
  	/*  2. All packets with SeqNum larger than or equal to WinStart => Buffer it. */
  	/*  */
  
  	/* recv_indicatepkts_in_order(padapter, preorder_ctrl, true); */
  	if (recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
  		mod_timer(&preorder_ctrl->reordering_ctrl_timer,
  			  jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
  		spin_unlock_bh(&ppending_recvframe_queue->lock);
  	} else {
  		spin_unlock_bh(&ppending_recvframe_queue->lock);
  		del_timer_sync(&preorder_ctrl->reordering_ctrl_timer);
  	}
  
  _success_exit:
  
  	return _SUCCESS;
  
  _err_exit:
  
  	spin_unlock_bh(&ppending_recvframe_queue->lock);
  
  	return _FAIL;
  }
  
  void rtw_reordering_ctrl_timeout_handler(unsigned long data)
  {
  	struct recv_reorder_ctrl *preorder_ctrl = (struct recv_reorder_ctrl *)data;
  	struct adapter *padapter = preorder_ctrl->padapter;
  	struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;
  
  	if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
  		return;
  
  	spin_lock_bh(&ppending_recvframe_queue->lock);
  
  	if (recv_indicatepkts_in_order(padapter, preorder_ctrl, true) == true)
  		mod_timer(&preorder_ctrl->reordering_ctrl_timer,
  			  jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
  
  	spin_unlock_bh(&ppending_recvframe_queue->lock);
  }
  
  static int process_recv_indicatepkts(struct adapter *padapter,
  				     struct recv_frame *prframe)
  {
  	int retval = _SUCCESS;
  	struct mlme_priv	*pmlmepriv = &padapter->mlmepriv;
  	struct ht_priv	*phtpriv = &pmlmepriv->htpriv;
  
  	if (phtpriv->ht_option) {  /* B/G/N Mode */
  		if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
  			/*  including perform A-MPDU Rx Ordering Buffer Control */
  			if ((!padapter->bDriverStopped) &&
  			    (!padapter->bSurpriseRemoved)) {
  				retval = _FAIL;
  				return retval;
  			}
  		}
  	} else { /* B/G mode */
  		retval = wlanhdr_to_ethhdr(prframe);
  		if (retval != _SUCCESS) {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("wlanhdr_to_ethhdr: drop pkt\n"));
  			return retval;
  		}
  
  		if ((!padapter->bDriverStopped) &&
  		    (!padapter->bSurpriseRemoved)) {
  			/* indicate this recv_frame */
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("@@@@ process_recv_indicatepkts- recv_func recv_indicatepkt\n"));
  			rtw_recv_indicatepkt(padapter, prframe);
  		} else {
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("@@@@ process_recv_indicatepkts- recv_func free_indicatepkt\n"));
  
  			RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("recv_func:bDriverStopped(%d) OR bSurpriseRemoved(%d)", padapter->bDriverStopped, padapter->bSurpriseRemoved));
  			retval = _FAIL;
  			return retval;
  		}
  	}
  
  	return retval;
  }
  
  static int recv_func_prehandle(struct adapter *padapter,
  			       struct recv_frame *rframe)
  {
  	int ret = _SUCCESS;
  	struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
  
  	/* check the frame crtl field and decache */
  	ret = validate_recv_frame(padapter, rframe);
  	if (ret != _SUCCESS) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("recv_func: validate_recv_frame fail! drop pkt\n"));
  		rtw_free_recvframe(rframe, pfree_recv_queue);/* free this recv_frame */
  		goto exit;
  	}
  
  exit:
  	return ret;
  }
  
  static int recv_func_posthandle(struct adapter *padapter,
  				struct recv_frame *prframe)
  {
  	int ret = _SUCCESS;
  	struct recv_frame *orig_prframe = prframe;
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  	struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
  
  	/*  DATA FRAME */
  	rtw_led_control(padapter, LED_CTL_RX);
  
  	prframe = decryptor(padapter, prframe);
  	if (prframe == NULL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("decryptor: drop pkt\n"));
  		ret = _FAIL;
  		goto _recv_data_drop;
  	}
  
  	prframe = recvframe_chk_defrag(padapter, prframe);
  	if (prframe == NULL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recvframe_chk_defrag: drop pkt\n"));
  		goto _recv_data_drop;
  	}
  
  	prframe = portctrl(padapter, prframe);
  	if (prframe == NULL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("portctrl: drop pkt\n"));
  		ret = _FAIL;
  		goto _recv_data_drop;
  	}
  
  	count_rx_stats(padapter, prframe, NULL);
  
  	ret = process_recv_indicatepkts(padapter, prframe);
  	if (ret != _SUCCESS) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recv_func: process_recv_indicatepkts fail!\n"));
  		rtw_free_recvframe(orig_prframe, pfree_recv_queue);/* free this recv_frame */
  		goto _recv_data_drop;
  	}
  	return ret;
  
  _recv_data_drop:
  	precvpriv->rx_drop++;
  	return ret;
  }
  
  static int recv_func(struct adapter *padapter, struct recv_frame *rframe)
  {
  	int ret;
  	struct rx_pkt_attrib *prxattrib = &rframe->attrib;
  	struct security_priv *psecuritypriv = &padapter->securitypriv;
  	struct mlme_priv *mlmepriv = &padapter->mlmepriv;
  
  	/* check if need to handle uc_swdec_pending_queue*/
  	if (check_fwstate(mlmepriv, WIFI_STATION_STATE) && psecuritypriv->busetkipkey) {
  		struct recv_frame *pending_frame;
  
  		while ((pending_frame = rtw_alloc_recvframe(&padapter->recvpriv.uc_swdec_pending_queue))) {
  			if (recv_func_posthandle(padapter, pending_frame) == _SUCCESS)
  				DBG_88E("%s: dequeue uc_swdec_pending_queue\n", __func__);
  		}
  	}
  
  	ret = recv_func_prehandle(padapter, rframe);
  
  	if (ret == _SUCCESS) {
  		/* check if need to enqueue into uc_swdec_pending_queue*/
  		if (check_fwstate(mlmepriv, WIFI_STATION_STATE) &&
  		    !IS_MCAST(prxattrib->ra) && prxattrib->encrypt > 0 &&
  		    (prxattrib->bdecrypted == 0 || psecuritypriv->sw_decrypt) &&
  		    !is_wep_enc(psecuritypriv->dot11PrivacyAlgrthm) &&
  		    !psecuritypriv->busetkipkey) {
  			rtw_enqueue_recvframe(rframe, &padapter->recvpriv.uc_swdec_pending_queue);
  			DBG_88E("%s: no key, enqueue uc_swdec_pending_queue\n", __func__);
  			goto exit;
  		}
  
  		ret = recv_func_posthandle(padapter, rframe);
  	}
  
  exit:
  	return ret;
  }
  
  s32 rtw_recv_entry(struct recv_frame *precvframe)
  {
  	struct adapter *padapter;
  	struct recv_priv *precvpriv;
  	s32 ret = _SUCCESS;
  
  
  	padapter = precvframe->adapter;
  
  	precvpriv = &padapter->recvpriv;
  
  	ret = recv_func(padapter, precvframe);
  	if (ret == _FAIL) {
  		RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("rtw_recv_entry: recv_func return fail!!!\n"));
  		goto _recv_entry_drop;
  	}
  
  	precvpriv->rx_pkts++;
  
  
  	return ret;
  
  _recv_entry_drop:
  	return ret;
  }
  
  void rtw_signal_stat_timer_hdl(unsigned long data)
  {
  	struct adapter *adapter = (struct adapter *)data;
  	struct recv_priv *recvpriv = &adapter->recvpriv;
  
  	u32 tmp_s, tmp_q;
  	u8 avg_signal_strength = 0;
  	u8 avg_signal_qual = 0;
  	u8 _alpha = 3; /*  this value is based on converging_constant = 5000 and sampling_interval = 1000 */
  
  	if (adapter->recvpriv.is_signal_dbg) {
  		/* update the user specific value, signal_strength_dbg, to signal_strength, rssi */
  		adapter->recvpriv.signal_strength = adapter->recvpriv.signal_strength_dbg;
  		adapter->recvpriv.rssi = (s8)translate_percentage_to_dbm((u8)adapter->recvpriv.signal_strength_dbg);
  	} else {
  		if (recvpriv->signal_strength_data.update_req == 0) {/*  update_req is clear, means we got rx */
  			avg_signal_strength = recvpriv->signal_strength_data.avg_val;
  			/*  after avg_vals are acquired, we can re-stat the signal values */
  			recvpriv->signal_strength_data.update_req = 1;
  		}
  
  		if (recvpriv->signal_qual_data.update_req == 0) {/*  update_req is clear, means we got rx */
  			avg_signal_qual = recvpriv->signal_qual_data.avg_val;
  			/*  after avg_vals are acquired, we can re-stat the signal values */
  			recvpriv->signal_qual_data.update_req = 1;
  		}
  
  		/* update value of signal_strength, rssi, signal_qual */
  		if (check_fwstate(&adapter->mlmepriv, _FW_UNDER_SURVEY) == false) {
  			tmp_s = avg_signal_strength+(_alpha-1)*recvpriv->signal_strength;
  			if (tmp_s % _alpha)
  				tmp_s = tmp_s/_alpha + 1;
  			else
  				tmp_s = tmp_s/_alpha;
  			if (tmp_s > 100)
  				tmp_s = 100;
  
  			tmp_q = avg_signal_qual+(_alpha-1)*recvpriv->signal_qual;
  			if (tmp_q % _alpha)
  				tmp_q = tmp_q/_alpha + 1;
  			else
  				tmp_q = tmp_q/_alpha;
  			if (tmp_q > 100)
  				tmp_q = 100;
  
  			recvpriv->signal_strength = tmp_s;
  			recvpriv->rssi = (s8)translate_percentage_to_dbm(tmp_s);
  			recvpriv->signal_qual = tmp_q;
  		}
  	}
  	rtw_set_signal_stat_timer(recvpriv);
  }
  