text: /******************************************************************************
   * rtl8712_recv.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 _RTL8712_RECV_C_
  
  #include <linux/if_ether.h>
  #include <linux/ip.h>
  
  #include "osdep_service.h"
  #include "drv_types.h"
  #include "recv_osdep.h"
  #include "mlme_osdep.h"
  #include "ethernet.h"
  #include "usb_ops.h"
  #include "wifi.h"
  
  /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  
  /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  
  static void recv_tasklet(void *priv);
  
  int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
  {
  	int i;
  	struct recv_buf *precvbuf;
  	int res = _SUCCESS;
  	addr_t tmpaddr = 0;
  	int alignment = 0;
  	struct sk_buff *pskb = NULL;
  
  	/*init recv_buf*/
  	_init_queue(&precvpriv->free_recv_buf_queue);
  	precvpriv->pallocated_recv_buf = kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4,
  						 GFP_ATOMIC);
  	if (precvpriv->pallocated_recv_buf == NULL)
  		return _FAIL;
  	precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  			      ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
  	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  	for (i = 0; i < NR_RECVBUFF; i++) {
  		INIT_LIST_HEAD(&precvbuf->list);
  		spin_lock_init(&precvbuf->recvbuf_lock);
  		res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
  		if (res == _FAIL)
  			break;
  		precvbuf->ref_cnt = 0;
  		precvbuf->adapter = padapter;
  		list_add_tail(&precvbuf->list,
  				 &(precvpriv->free_recv_buf_queue.queue));
  		precvbuf++;
  	}
  	precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  	tasklet_init(&precvpriv->recv_tasklet,
  	     (void(*)(unsigned long))recv_tasklet,
  	     (unsigned long)padapter);
  	skb_queue_head_init(&precvpriv->rx_skb_queue);
  
  	skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  	for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  		pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  		       RECVBUFF_ALIGN_SZ);
  		if (pskb) {
  			tmpaddr = (addr_t)pskb->data;
  			alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
  			skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  			skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  		}
  		pskb = NULL;
  	}
  	return res;
  }
  
  void r8712_free_recv_priv(struct recv_priv *precvpriv)
  {
  	int i;
  	struct recv_buf *precvbuf;
  	struct _adapter *padapter = precvpriv->adapter;
  
  	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  	for (i = 0; i < NR_RECVBUFF; i++) {
  		r8712_os_recvbuf_resource_free(padapter, precvbuf);
  		precvbuf++;
  	}
  	kfree(precvpriv->pallocated_recv_buf);
  	skb_queue_purge(&precvpriv->rx_skb_queue);
  	if (skb_queue_len(&precvpriv->rx_skb_queue))
  		netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
  	skb_queue_purge(&precvpriv->free_recv_skb_queue);
  	if (skb_queue_len(&precvpriv->free_recv_skb_queue))
  		netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
  			    skb_queue_len(&precvpriv->free_recv_skb_queue));
  }
  
  int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
  {
  	precvbuf->transfer_len = 0;
  	precvbuf->len = 0;
  	precvbuf->ref_cnt = 0;
  	if (precvbuf->pbuf) {
  		precvbuf->pdata = precvbuf->pbuf;
  		precvbuf->phead = precvbuf->pbuf;
  		precvbuf->ptail = precvbuf->pbuf;
  		precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
  	}
  	return _SUCCESS;
  }
  
  int r8712_free_recvframe(union recv_frame *precvframe,
  		   struct  __queue *pfree_recv_queue)
  {
  	unsigned long irqL;
  	struct _adapter *padapter = precvframe->u.hdr.adapter;
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  
  	if (precvframe->u.hdr.pkt) {
  		dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
  		precvframe->u.hdr.pkt = NULL;
  	}
  	spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
  	list_del_init(&(precvframe->u.hdr.list));
  	list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
  	if (padapter != NULL) {
  		if (pfree_recv_queue == &precvpriv->free_recv_queue)
  				precvpriv->free_recvframe_cnt++;
  	}
  	spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
  	return _SUCCESS;
  }
  
  static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
  					   struct recv_stat *prxstat)
  {
  	u16 drvinfo_sz = 0;
  
  	drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
  	drvinfo_sz = drvinfo_sz<<3;
  	/*TODO:
  	 * Offset 0 */
  	pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
  				 ? 0 : 1;
  	pattrib->crc_err = ((le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14);
  	/*Offset 4*/
  	/*Offset 8*/
  	/*Offset 12*/
  	if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
  		pattrib->tcpchk_valid = 1; /* valid */
  		if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
  			pattrib->tcp_chkrpt = 1; /* correct */
  		else
  			pattrib->tcp_chkrpt = 0; /* incorrect */
  		if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
  			pattrib->ip_chkrpt = 1; /* correct */
  		else
  			pattrib->ip_chkrpt = 0; /* incorrect */
  	} else
  		pattrib->tcpchk_valid = 0; /* invalid */
  	pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
  	pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
  	/*Offset 16*/
  	/*Offset 20*/
  	/*phy_info*/
  }
  
  /*perform defrag*/
  static union recv_frame *recvframe_defrag(struct _adapter *adapter,
  				   struct  __queue *defrag_q)
  {
  	struct list_head *plist, *phead;
  	u8 wlanhdr_offset;
  	u8	curfragnum;
  	struct recv_frame_hdr *pfhdr, *pnfhdr;
  	union recv_frame *prframe, *pnextrframe;
  	struct  __queue	*pfree_recv_queue;
  
  	pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
  	phead = &defrag_q->queue;
  	plist = phead->next;
  	prframe = LIST_CONTAINOR(plist, union recv_frame, u);
  	list_del_init(&prframe->u.list);
  	pfhdr = &prframe->u.hdr;
  	curfragnum = 0;
  	if (curfragnum != pfhdr->attrib.frag_num) {
  		/*the first fragment number must be 0
  		 *free the whole queue*/
  		r8712_free_recvframe(prframe, pfree_recv_queue);
  		r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
  		return NULL;
  	}
  	curfragnum++;
  	plist = &defrag_q->queue;
  	plist = plist->next;
  	while (end_of_queue_search(phead, plist) == false) {
  		pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
  		pnfhdr = &pnextrframe->u.hdr;
  		/*check the fragment sequence  (2nd ~n fragment frame) */
  		if (curfragnum != pnfhdr->attrib.frag_num) {
  			/* the fragment number must increase  (after decache)
  			 * release the defrag_q & prframe */
  			r8712_free_recvframe(prframe, pfree_recv_queue);
  			r8712_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(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 */
  	r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
  	return prframe;
  }
  
  /* check if need to defrag, if needed queue the frame to defrag_q */
  union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
  					     union recv_frame *precv_frame)
  {
  	u8	ismfrag;
  	u8	fragnum;
  	u8   *psta_addr;
  	struct recv_frame_hdr *pfhdr;
  	struct sta_info *psta;
  	struct	sta_priv *pstapriv;
  	struct list_head *phead;
  	union recv_frame *prtnframe = NULL;
  	struct  __queue *pfree_recv_queue, *pdefrag_q;
  
  	pstapriv = &padapter->stapriv;
  	pfhdr = &precv_frame->u.hdr;
  	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 = r8712_get_stainfo(pstapriv, psta_addr);
  	if (psta == NULL)
  		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 */
  					r8712_free_recvframe_queue(pdefrag_q,
  							     pfree_recv_queue);
  				}
  			}
  			/* Then enqueue the 0~(n-1) fragment to the defrag_q */
  			phead = &pdefrag_q->queue;
  			list_add_tail(&pfhdr->list, phead);
  			prtnframe = NULL;
  		} else {
  			/* can't find this ta's defrag_queue, so free this
  			 * recv_frame */
  			r8712_free_recvframe(precv_frame, pfree_recv_queue);
  			prtnframe = NULL;
  		}
  
  	}
  	if ((ismfrag == 0) && (fragnum != 0)) {
  		/* the last fragment frame
  		 * enqueue the last fragment */
  		if (pdefrag_q != NULL) {
  			phead = &pdefrag_q->queue;
  			list_add_tail(&pfhdr->list, phead);
  			/*call recvframe_defrag to defrag*/
  			precv_frame = recvframe_defrag(padapter, pdefrag_q);
  			prtnframe = precv_frame;
  		} else {
  			/* can't find this ta's defrag_queue, so free this
  			 *  recv_frame */
  			r8712_free_recvframe(precv_frame, pfree_recv_queue);
  			prtnframe = NULL;
  		}
  	}
  	if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
  		/* after defrag we must check tkip mic code */
  		if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
  			r8712_free_recvframe(prtnframe, pfree_recv_queue);
  			prtnframe = NULL;
  		}
  	}
  	return prtnframe;
  }
  
  static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
  {
  	int	a_len, padding_len;
  	u16	eth_type, nSubframe_Length;
  	u8	nr_subframes, i;
  	unsigned char *data_ptr, *pdata;
  	struct rx_pkt_attrib *pattrib;
  	_pkt *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->u.hdr.attrib;
  	recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
  	if (prframe->u.hdr.attrib.iv_len > 0)
  		recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
  	a_len = prframe->u.hdr.len;
  	pdata = prframe->u.hdr.rx_data;
  	while (a_len > ETH_HLEN) {
  		/* Offset 12 denote 2 mac address */
  		nSubframe_Length = *((u16 *)(pdata + 12));
  		/*==m==>change the length order*/
  		nSubframe_Length = (nSubframe_Length >> 8) +
  				   (nSubframe_Length << 8);
  		if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
  			netdev_warn(padapter->pnetdev, "r8712u: 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)
  			break;
  		skb_reserve(sub_skb, 12);
  		data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
  		memcpy(data_ptr, pdata, nSubframe_Length);
  		subframes[nr_subframes++] = sub_skb;
  		if (nr_subframes >= MAX_SUBFRAME_COUNT) {
  			netdev_warn(padapter->pnetdev, "r8712u: 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) & 3);
  			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 = (sub_skb->data[6] << 8) | sub_skb->data[7];
  		if (sub_skb->len >= 8 &&
  		   ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
  		   eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
  		   !memcmp(sub_skb->data, 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 {
  			u16 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 */
  		if (sub_skb) {
  			sub_skb->protocol =
  				 eth_type_trans(sub_skb, padapter->pnetdev);
  			sub_skb->dev = padapter->pnetdev;
  			if ((pattrib->tcpchk_valid == 1) &&
  			    (pattrib->tcp_chkrpt == 1)) {
  				sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
  			} else
  				sub_skb->ip_summed = CHECKSUM_NONE;
  			netif_rx(sub_skb);
  		}
  	}
  exit:
  	prframe->u.hdr.len = 0;
  	r8712_free_recvframe(prframe, pfree_recv_queue);
  	return _SUCCESS;
  }
  
  void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
  {
  	uint voffset;
  	u8 *poffset;
  	u16 cmd_len, drvinfo_sz;
  	struct recv_stat *prxstat;
  
  	poffset = (u8 *)prxcmdbuf;
  	voffset = *(uint *)poffset;
  	prxstat = (struct recv_stat *)prxcmdbuf;
  	drvinfo_sz = ((le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16);
  	drvinfo_sz = drvinfo_sz << 3;
  	poffset += RXDESC_SIZE + drvinfo_sz;
  	do {
  		voffset  = *(uint *)poffset;
  		cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
  		r8712_event_handle(padapter, (uint *)poffset);
  		poffset += (cmd_len + 8);/*8 bytes alignment*/
  	} while (le32_to_cpu(voffset) & BIT(31));
  
  }
  
  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) % 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) % 4096;
  	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 = 4095 - (wsize -
  						      (seq_num + 1)) + 1;
  	}
  	return true;
  }
  
  static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
  			      union recv_frame *prframe)
  {
  	struct list_head *phead, *plist;
  	union recv_frame *pnextrframe;
  	struct rx_pkt_attrib *pnextattrib;
  	struct  __queue *ppending_recvframe_queue =
  					&preorder_ctrl->pending_recvframe_queue;
  	struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
  
  	phead = &ppending_recvframe_queue->queue;
  	plist = phead->next;
  	while (end_of_queue_search(phead, plist) == false) {
  		pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
  		pnextattrib = &pnextrframe->u.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->u.hdr.list));
  	list_add_tail(&(prframe->u.hdr.list), plist);
  	return true;
  }
  
  int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
  			       struct recv_reorder_ctrl *preorder_ctrl,
  			       int bforced)
  {
  	struct list_head *phead, *plist;
  	union recv_frame *prframe;
  	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 = &ppending_recvframe_queue->queue;
  	plist = phead->next;
  	/* Handling some condition for forced indicate case.*/
  	if (bforced == true) {
  		if (list_empty(phead))
  			return true;
  
  		prframe = LIST_CONTAINOR(plist, union recv_frame, u);
  		pattrib = &prframe->u.hdr.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)) {
  		prframe = LIST_CONTAINOR(plist, union recv_frame, u);
  		pattrib = &prframe->u.hdr.attrib;
  		if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
  			plist = plist->next;
  			list_del_init(&(prframe->u.hdr.list));
  			if (SN_EQUAL(preorder_ctrl->indicate_seq,
  			    pattrib->seq_num))
  				preorder_ctrl->indicate_seq =
  				  (preorder_ctrl->indicate_seq + 1) % 4096;
  			/*indicate this recv_frame*/
  			if (!pattrib->amsdu) {
  				if ((padapter->bDriverStopped == false) &&
  				    (padapter->bSurpriseRemoved == false)) {
  					/* indicate this recv_frame */
  					r8712_recv_indicatepkt(padapter,
  							       prframe);
  				}
  			} else if (pattrib->amsdu == 1) {
  				if (amsdu_to_msdu(padapter, prframe) !=
  				    _SUCCESS)
  					r8712_free_recvframe(prframe,
  						   &precvpriv->free_recv_queue);
  			}
  			/* Update local variables. */
  			bPktInBuf = false;
  		} else {
  			bPktInBuf = true;
  			break;
  		}
  	}
  	return bPktInBuf;
  }
  
  static int recv_indicatepkt_reorder(struct _adapter *padapter,
  			     union recv_frame *prframe)
  {
  	unsigned long irql;
  	struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
  	struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
  	struct  __queue *ppending_recvframe_queue =
  			 &preorder_ctrl->pending_recvframe_queue;
  
  	if (!pattrib->amsdu) {
  		/* s1. */
  		r8712_wlanhdr_to_ethhdr(prframe);
  		if (pattrib->qos != 1) {
  			if ((padapter->bDriverStopped == false) &&
  			   (padapter->bSurpriseRemoved == false)) {
  				r8712_recv_indicatepkt(padapter, prframe);
  				return _SUCCESS;
  			} else
  				return _FAIL;
  		}
  	}
  	spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
  	/*s2. check if winstart_b(indicate_seq) needs to be updated*/
  	if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
  		goto _err_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.
  	 */
  	if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
  	    true) {
  		_set_timer(&preorder_ctrl->reordering_ctrl_timer,
  			   REORDER_WAIT_TIME);
  		spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
  	} else {
  		spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
  		_cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
  	}
  	return _SUCCESS;
  _err_exit:
  	spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
  	return _FAIL;
  }
  
  void r8712_reordering_ctrl_timeout_handler(void *pcontext)
  {
  	unsigned long irql;
  	struct recv_reorder_ctrl *preorder_ctrl =
  				 (struct recv_reorder_ctrl *)pcontext;
  	struct _adapter *padapter = preorder_ctrl->padapter;
  	struct  __queue *ppending_recvframe_queue =
  				 &preorder_ctrl->pending_recvframe_queue;
  
  	if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
  		return;
  	spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
  	r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
  	spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
  }
  
  static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
  			      union recv_frame *prframe)
  {
  	int retval = _SUCCESS;
  	struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
  	struct ht_priv	*phtpriv = &pmlmepriv->htpriv;
  
  	if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
  		if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
  			/* including perform A-MPDU Rx Ordering Buffer Control*/
  			if ((padapter->bDriverStopped == false) &&
  			    (padapter->bSurpriseRemoved == false))
  				return _FAIL;
  		}
  	} else { /*B/G mode*/
  		retval = r8712_wlanhdr_to_ethhdr(prframe);
  		if (retval != _SUCCESS)
  			return retval;
  		if ((padapter->bDriverStopped == false) &&
  		    (padapter->bSurpriseRemoved == false)) {
  			/* indicate this recv_frame */
  			r8712_recv_indicatepkt(padapter, prframe);
  		} else
  			return _FAIL;
  	}
  	return retval;
  }
  
  static u8 query_rx_pwr_percentage(s8 antpower)
  {
  	if ((antpower <= -100) || (antpower >= 20))
  		return	0;
  	else if (antpower >= 0)
  		return	100;
  	else
  		return 100 + antpower;
  }
  
  static u8 evm_db2percentage(s8 value)
  {
  	/*
  	 * -33dB~0dB to 0%~99%
  	 */
  	s8 ret_val;
  
  	ret_val = value;
  	if (ret_val >= 0)
  		ret_val = 0;
  	if (ret_val <= -33)
  		ret_val = -33;
  	ret_val = -ret_val;
  	ret_val *= 3;
  	if (ret_val == 99)
  		ret_val = 100;
  	return ret_val;
  }
  
  s32 r8712_signal_scale_mapping(s32 cur_sig)
  {
  	s32 ret_sig;
  
  	if (cur_sig >= 51 && cur_sig <= 100)
  		ret_sig = 100;
  	else if (cur_sig >= 41 && cur_sig <= 50)
  		ret_sig = 80 + ((cur_sig - 40) * 2);
  	else if (cur_sig >= 31 && cur_sig <= 40)
  		ret_sig = 66 + (cur_sig - 30);
  	else if (cur_sig >= 21 && cur_sig <= 30)
  		ret_sig = 54 + (cur_sig - 20);
  	else if (cur_sig >= 10 && cur_sig <= 20)
  		ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
  	else if (cur_sig >= 5 && cur_sig <= 9)
  		ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
  	else if (cur_sig >= 1 && cur_sig <= 4)
  		ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
  	else
  		ret_sig = cur_sig;
  	return ret_sig;
  }
  
  static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
  {
  	s32 signal_power; /* in dBm.*/
  	/* Translate to dBm (x=0.5y-95).*/
  	signal_power = (s32)((signal_strength_idx + 1) >> 1);
  	signal_power -= 95;
  	return signal_power;
  }
  
  static void query_rx_phy_status(struct _adapter *padapter,
  				union recv_frame *prframe)
  {
  	u8 i, max_spatial_stream, evm;
  	struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
  	struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
  	u8 *pphy_head = (u8 *)(prxstat + 1);
  	s8 rx_pwr[4], rx_pwr_all;
  	u8 pwdb_all;
  	u32 rssi, total_rssi = 0;
  	u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
  	struct phy_cck_rx_status *pcck_buf;
  	u8 sq;
  
  	/* Record it for next packet processing*/
  	bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
  	if (bcck_rate) {
  		u8 report;
  
  		/* CCK Driver info Structure is not the same as OFDM packet.*/
  		pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
  		/* (1)Hardware does not provide RSSI for CCK
  		 * (2)PWDB, Average PWDB cacluated by hardware
  		 * (for rate adaptive)
  		 */
  		if (!cck_highpwr) {
  			report = pcck_buf->cck_agc_rpt & 0xc0;
  			report = report >> 6;
  			switch (report) {
  			/* Modify the RF RNA gain value to -40, -20,
  			 * -2, 14 by Jenyu's suggestion
  			 * Note: different RF with the different
  			 * RNA gain. */
  			case 0x3:
  				rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
  					     0x3e);
  				break;
  			case 0x2:
  				rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
  					     0x3e);
  				break;
  			case 0x1:
  				rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
  					     0x3e);
  				break;
  			case 0x0:
  				rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
  					     0x3e);
  				break;
  			}
  		} else {
  			report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
  				 0x60;
  			report = report >> 5;
  			switch (report) {
  			case 0x3:
  				rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
  					     0x1f) << 1);
  				break;
  			case 0x2:
  				rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
  					     0x1f) << 1);
  				break;
  			case 0x1:
  				rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
  					     0x1f) << 1);
  				break;
  			case 0x0:
  				rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
  					     0x1f) << 1);
  				break;
  			}
  		}
  		pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
  		/* CCK gain is smaller than OFDM/MCS gain,*/
  		/* so we add gain diff by experiences, the val is 6 */
  		pwdb_all += 6;
  		if (pwdb_all > 100)
  			pwdb_all = 100;
  		/* modify the offset to make the same gain index with OFDM.*/
  		if (pwdb_all > 34 && pwdb_all <= 42)
  			pwdb_all -= 2;
  		else if (pwdb_all > 26 && pwdb_all <= 34)
  			pwdb_all -= 6;
  		else if (pwdb_all > 14 && pwdb_all <= 26)
  			pwdb_all -= 8;
  		else if (pwdb_all > 4 && pwdb_all <= 14)
  			pwdb_all -= 4;
  		/*
  		 * (3) Get Signal Quality (EVM)
  		 */
  		if (pwdb_all > 40)
  			sq = 100;
  		else {
  			sq = pcck_buf->sq_rpt;
  			if (pcck_buf->sq_rpt > 64)
  				sq = 0;
  			else if (pcck_buf->sq_rpt < 20)
  				sq = 100;
  			else
  				sq = ((64-sq) * 100) / 44;
  		}
  		prframe->u.hdr.attrib.signal_qual = sq;
  		prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
  		prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
  	} else {
  		/* (1)Get RSSI for HT rate */
  		for (i = 0; i < ((padapter->registrypriv.rf_config) &
  			    0x0f); i++) {
  			rf_rx_num++;
  			rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
  				    & 0x3F) * 2) - 110;
  			/* Translate DBM to percentage. */
  			rssi = query_rx_pwr_percentage(rx_pwr[i]);
  			total_rssi += rssi;
  		}
  		/* (2)PWDB, Average PWDB cacluated by hardware (for
  		 * rate adaptive) */
  		rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
  			     - 106;
  		pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
  
  		{
  			/* (3)EVM of HT rate */
  			if (prframe->u.hdr.attrib.htc &&
  			    prframe->u.hdr.attrib.mcs_rate >= 20 &&
  			    prframe->u.hdr.attrib.mcs_rate <= 27) {
  				/* both spatial stream make sense */
  				max_spatial_stream = 2;
  			} else {
  				/* only spatial stream 1 makes sense */
  				max_spatial_stream = 1;
  			}
  			for (i = 0; i < max_spatial_stream; i++) {
  				evm = evm_db2percentage((pphy_head
  				      [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
  				prframe->u.hdr.attrib.signal_qual =
  					 (u8)(evm & 0xff);
  				prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
  					 (u8)(evm & 0xff);
  			}
  		}
  	}
  	/* UI BSS List signal strength(in percentage), make it good looking,
  	 * from 0~100. It is assigned to the BSS List in
  	 * GetValueFromBeaconOrProbeRsp(). */
  	if (bcck_rate)
  		prframe->u.hdr.attrib.signal_strength =
  			 (u8)r8712_signal_scale_mapping(pwdb_all);
  	else {
  		if (rf_rx_num != 0)
  			prframe->u.hdr.attrib.signal_strength =
  				 (u8)(r8712_signal_scale_mapping(total_rssi /=
  				 rf_rx_num));
  	}
  }
  
  static void process_link_qual(struct _adapter *padapter,
  			      union recv_frame *prframe)
  {
  	u32	last_evm = 0, tmpVal;
  	struct rx_pkt_attrib *pattrib;
  
  	if (prframe == NULL || padapter == NULL)
  		return;
  	pattrib = &prframe->u.hdr.attrib;
  	if (pattrib->signal_qual != 0) {
  		/*
  		 * 1. Record the general EVM to the sliding window.
  		 */
  		if (padapter->recvpriv.signal_qual_data.total_num++ >=
  				  PHY_LINKQUALITY_SLID_WIN_MAX) {
  			padapter->recvpriv.signal_qual_data.total_num =
  				  PHY_LINKQUALITY_SLID_WIN_MAX;
  			last_evm = padapter->recvpriv.signal_qual_data.elements
  				  [padapter->recvpriv.signal_qual_data.index];
  			padapter->recvpriv.signal_qual_data.total_val -=
  				  last_evm;
  		}
  		padapter->recvpriv.signal_qual_data.total_val +=
  			  pattrib->signal_qual;
  		padapter->recvpriv.signal_qual_data.elements[padapter->
  			  recvpriv.signal_qual_data.index++] =
  			  pattrib->signal_qual;
  		if (padapter->recvpriv.signal_qual_data.index >=
  		    PHY_LINKQUALITY_SLID_WIN_MAX)
  			padapter->recvpriv.signal_qual_data.index = 0;
  
  		/* <1> Showed on UI for user, in percentage. */
  		tmpVal = padapter->recvpriv.signal_qual_data.total_val /
  			 padapter->recvpriv.signal_qual_data.total_num;
  		padapter->recvpriv.signal = (u8)tmpVal;
  	}
  }
  
  static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
  {
  	u32 last_rssi, tmp_val;
  	struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
  
  	if (padapter->recvpriv.signal_strength_data.total_num++ >=
  	    PHY_RSSI_SLID_WIN_MAX) {
  		padapter->recvpriv.signal_strength_data.total_num =
  			 PHY_RSSI_SLID_WIN_MAX;
  		last_rssi = padapter->recvpriv.signal_strength_data.elements
  			    [padapter->recvpriv.signal_strength_data.index];
  		padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
  	}
  	padapter->recvpriv.signal_strength_data.total_val +=
  			pattrib->signal_strength;
  	padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
  			signal_strength_data.index++] =
  			pattrib->signal_strength;
  	if (padapter->recvpriv.signal_strength_data.index >=
  	    PHY_RSSI_SLID_WIN_MAX)
  		padapter->recvpriv.signal_strength_data.index = 0;
  	tmp_val = padapter->recvpriv.signal_strength_data.total_val /
  		  padapter->recvpriv.signal_strength_data.total_num;
  	padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
  }
  
  static void process_phy_info(struct _adapter *padapter,
  			     union recv_frame *prframe)
  {
  	query_rx_phy_status(padapter, prframe);
  	process_rssi(padapter, prframe);
  	process_link_qual(padapter,  prframe);
  }
  
  int recv_func(struct _adapter *padapter, void *pcontext)
  {
  	struct rx_pkt_attrib *pattrib;
  	union recv_frame *prframe, *orig_prframe;
  	int retval = _SUCCESS;
  	struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
  	struct	mlme_priv	*pmlmepriv = &padapter->mlmepriv;
  
  	prframe = (union recv_frame *)pcontext;
  	orig_prframe = prframe;
  	pattrib = &prframe->u.hdr.attrib;
  	if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
  		if (pattrib->crc_err == 1)
  			padapter->mppriv.rx_crcerrpktcount++;
  		else
  			padapter->mppriv.rx_pktcount++;
  		if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
  			/* free this recv_frame */
  			r8712_free_recvframe(orig_prframe, pfree_recv_queue);
  			goto _exit_recv_func;
  		}
  	}
  	/* check the frame crtl field and decache */
  	retval = r8712_validate_recv_frame(padapter, prframe);
  	if (retval != _SUCCESS) {
  		/* free this recv_frame */
  		r8712_free_recvframe(orig_prframe, pfree_recv_queue);
  		goto _exit_recv_func;
  	}
  	process_phy_info(padapter, prframe);
  	prframe = r8712_decryptor(padapter, prframe);
  	if (prframe == NULL) {
  		retval = _FAIL;
  		goto _exit_recv_func;
  	}
  	prframe = r8712_recvframe_chk_defrag(padapter, prframe);
  	if (prframe == NULL)
  		goto _exit_recv_func;
  	prframe = r8712_portctrl(padapter, prframe);
  	if (prframe == NULL) {
  		retval = _FAIL;
  		goto _exit_recv_func;
  	}
  	retval = r8712_process_recv_indicatepkts(padapter, prframe);
  	if (retval != _SUCCESS) {
  		r8712_free_recvframe(orig_prframe, pfree_recv_queue);
  		goto _exit_recv_func;
  	}
  _exit_recv_func:
  	return retval;
  }
  
  static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
  {
  	u8 *pbuf, shift_sz = 0;
  	u8	frag, mf;
  	uint	pkt_len;
  	u32 transfer_len;
  	struct recv_stat *prxstat;
  	u16	pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
  	struct  __queue *pfree_recv_queue;
  	_pkt  *pkt_copy = NULL;
  	union recv_frame *precvframe = NULL;
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  
  	pfree_recv_queue = &(precvpriv->free_recv_queue);
  	pbuf = pskb->data;
  	prxstat = (struct recv_stat *)pbuf;
  	pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
  	pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
  	transfer_len = pskb->len;
  	/* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
  	 * pairs. The packet count will be a big number so that the containing
  	 * packet will effect the Rx reordering. */
  	if (transfer_len < pkt_len) {
  		/* In this case, it means the MAX_RECVBUF_SZ is too small to
  		 * get the data from 8712u. */
  		return _FAIL;
  	}
  	do {
  		prxstat = (struct recv_stat *)pbuf;
  		pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
  		/* more fragment bit */
  		mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
  		/* ragmentation number */
  		frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
  		/* uint 2^3 = 8 bytes */
  		drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
  		drvinfo_sz = drvinfo_sz<<3;
  		if (pkt_len <= 0)
  			goto  _exit_recvbuf2recvframe;
  		/* Qos data, wireless lan header length is 26 */
  		if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
  			shift_sz = 2;
  		precvframe = r8712_alloc_recvframe(pfree_recv_queue);
  		if (precvframe == NULL)
  			goto  _exit_recvbuf2recvframe;
  		INIT_LIST_HEAD(&precvframe->u.hdr.list);
  		precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
  		precvframe->u.hdr.len = 0;
  		tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
  		pkt_offset = (u16)round_up(tmp_len, 128);
  		/* for first fragment packet, driver need allocate 1536 +
  		 * drvinfo_sz + RXDESC_SIZE to defrag packet. */
  		if ((mf == 1) && (frag == 0))
  			alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
  		else
  			alloc_sz = tmp_len;
  		/* 2 is for IP header 4 bytes alignment in QoS packet case.
  		 * 4 is for skb->data 4 bytes alignment. */
  		alloc_sz += 6;
  		pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
  		if (pkt_copy) {
  			precvframe->u.hdr.pkt = pkt_copy;
  			skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
  				    % 4));
  			skb_reserve(pkt_copy, shift_sz);
  			memcpy(pkt_copy->data, pbuf, tmp_len);
  			precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
  				 precvframe->u.hdr.rx_tail = pkt_copy->data;
  			precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
  		} else {
  			precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
  			if (!precvframe->u.hdr.pkt)
  				return _FAIL;
  			precvframe->u.hdr.rx_head = pbuf;
  			precvframe->u.hdr.rx_data = pbuf;
  			precvframe->u.hdr.rx_tail = pbuf;
  			precvframe->u.hdr.rx_end = pbuf + alloc_sz;
  		}
  		recvframe_put(precvframe, tmp_len);
  		recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
  		/* because the endian issue, driver avoid reference to the
  		 * rxstat after calling update_recvframe_attrib_from_recvstat();
  		 */
  		update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
  						      prxstat);
  		r8712_recv_entry(precvframe);
  		transfer_len -= pkt_offset;
  		pbuf += pkt_offset;
  		pkt_cnt--;
  		precvframe = NULL;
  		pkt_copy = NULL;
  	} while ((transfer_len > 0) && pkt_cnt > 0);
  _exit_recvbuf2recvframe:
  	return _SUCCESS;
  }
  
  static void recv_tasklet(void *priv)
  {
  	struct sk_buff *pskb;
  	struct _adapter *padapter = (struct _adapter *)priv;
  	struct recv_priv *precvpriv = &padapter->recvpriv;
  
  	while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
  		recvbuf2recvframe(padapter, pskb);
  		skb_reset_tail_pointer(pskb);
  		pskb->len = 0;
  		if (!skb_cloned(pskb))
  			skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  		else
  			consume_skb(pskb);
  	}
  }
  