staging: r8712u: Add the new driver to the mainline kernel

This code is for a completely new version of the Realtek 8192 USB devices
such as the D-Link DWA-130. The Realtek code, which was originally for
Linux, Windows XP and Windows CE, has been stripped of all code not needed
for Linux. In addition, only one additional configuration variable, which
enables AP mode, remains.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Florian Schilhabel <florian.c.schilhabel@googlemail.com>
Tested-by: Frederic Leroy <fredo@starox.org>

1 files changed, 715 insertions, 0 deletions

diff --git a/drivers/staging/rtl8712/rtl871x_recv.c b/drivers/staging/rtl8712/rtl871x_recv.c
new file mode 100644
index 0000000..1f4304f
--- /dev/null
+++ b/drivers/staging/rtl8712/rtl871x_recv.c
@@ -0,0 +1,715 @@
+/******************************************************************************
+ * rtl871x_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 _RTL871X_RECV_C_
+
+#include "osdep_service.h"
+#include "drv_types.h"
+#include "recv_osdep.h"
+#include "mlme_osdep.h"
+#include "ip.h"
+#include "if_ether.h"
+#include "ethernet.h"
+#include "usb_ops.h"
+#include "wifi.h"
+
+static const u8 SNAP_ETH_TYPE_IPX[2] = {0x81, 0x37};
+
+/* Datagram Delivery Protocol */
+static const u8 SNAP_ETH_TYPE_APPLETALK_AARP[2] = {0x80, 0xf3};
+
+/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
+static const u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
+
+/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
+static const u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
+
+void _r8712_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);
+	_init_queue(&psta_recvpriv->defrag_q);
+}
+
+sint _r8712_init_recv_priv(struct recv_priv *precvpriv,
+			   struct _adapter *padapter)
+{
+	sint i;
+	union recv_frame *precvframe;
+
+	 memset((unsigned char *)precvpriv, 0, sizeof(struct  recv_priv));
+	spin_lock_init(&precvpriv->lock);
+	_init_queue(&precvpriv->free_recv_queue);
+	_init_queue(&precvpriv->recv_pending_queue);
+	precvpriv->adapter = padapter;
+	precvpriv->free_recvframe_cnt = NR_RECVFRAME;
+	precvpriv->pallocated_frame_buf = _malloc(NR_RECVFRAME *
+					   sizeof(union recv_frame) +
+					   RXFRAME_ALIGN_SZ);
+	if (precvpriv->pallocated_frame_buf == NULL)
+		return _FAIL;
+	memset(precvpriv->pallocated_frame_buf, 0, NR_RECVFRAME *
+		sizeof(union recv_frame) + RXFRAME_ALIGN_SZ);
+	precvpriv->precv_frame_buf = precvpriv->pallocated_frame_buf +
+				    RXFRAME_ALIGN_SZ -
+				    ((addr_t)(precvpriv->pallocated_frame_buf) &
+				    (RXFRAME_ALIGN_SZ-1));
+	precvframe = (union recv_frame *)precvpriv->precv_frame_buf;
+	for (i = 0; i < NR_RECVFRAME; i++) {
+		_init_listhead(&(precvframe->u.list));
+		list_insert_tail(&(precvframe->u.list),
+				 &(precvpriv->free_recv_queue.queue));
+		r8712_os_recv_resource_alloc(padapter, precvframe);
+		precvframe->u.hdr.adapter = padapter;
+		precvframe++;
+	}
+	precvpriv->rx_pending_cnt = 1;
+	sema_init(&precvpriv->allrxreturnevt, 0);
+	return r8712_init_recv_priv(precvpriv, padapter);
+}
+
+void _r8712_free_recv_priv(struct recv_priv *precvpriv)
+{
+	kfree(precvpriv->pallocated_frame_buf);
+	r8712_free_recv_priv(precvpriv);
+}
+
+union recv_frame *r8712_alloc_recvframe(struct  __queue *pfree_recv_queue)
+{
+	unsigned long irqL;
+	union recv_frame  *precvframe;
+	struct list_head *plist, *phead;
+	struct _adapter *padapter;
+	struct recv_priv *precvpriv;
+
+	spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
+	if (_queue_empty(pfree_recv_queue) == true)
+		precvframe = NULL;
+	else {
+		phead = get_list_head(pfree_recv_queue);
+		plist = get_next(phead);
+		precvframe = LIST_CONTAINOR(plist, union recv_frame, u);
+		list_delete(&precvframe->u.hdr.list);
+		padapter = precvframe->u.hdr.adapter;
+		if (padapter != NULL) {
+			precvpriv = &padapter->recvpriv;
+			if (pfree_recv_queue == &precvpriv->free_recv_queue)
+				precvpriv->free_recvframe_cnt--;
+		}
+	}
+	spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
+	return precvframe;
+}
+
+union recv_frame *dequeue_recvframe(struct  __queue *queue)
+{
+	return r8712_alloc_recvframe(queue);
+}
+
+sint enqueue_recvframe(union recv_frame *precvframe, struct  __queue *queue)
+{
+	unsigned long irqL;
+	struct _adapter *padapter = precvframe->u.hdr.adapter;
+	struct recv_priv *precvpriv = &padapter->recvpriv;
+
+	 spin_lock_irqsave(&queue->lock, irqL);
+	list_delete(&(precvframe->u.hdr.list));
+	list_insert_tail(&(precvframe->u.hdr.list), get_list_head(queue));
+	if (padapter != NULL) {
+		if (queue == &precvpriv->free_recv_queue)
+			precvpriv->free_recvframe_cnt++;
+	}
+	 spin_unlock_irqrestore(&queue->lock, irqL);
+	return _SUCCESS;
+}
+
+/*
+caller : defrag; recvframe_chk_defrag in recv_thread  (passive)
+pframequeue: defrag_queue : will be accessed in recv_thread  (passive)
+
+using spin_lock to protect
+
+*/
+
+void r8712_free_recvframe_queue(struct  __queue *pframequeue,
+				struct  __queue *pfree_recv_queue)
+{
+	union	recv_frame *precvframe;
+	struct list_head *plist, *phead;
+
+	spin_lock(&pframequeue->lock);
+	phead = get_list_head(pframequeue);
+	plist = get_next(phead);
+	while (end_of_queue_search(phead, plist) == false) {
+		precvframe = LIST_CONTAINOR(plist, union recv_frame, u);
+		plist = get_next(plist);
+		r8712_free_recvframe(precvframe, pfree_recv_queue);
+	}
+	spin_unlock(&pframequeue->lock);
+}
+
+sint r8712_recvframe_chkmic(struct _adapter *adapter,
+			    union recv_frame *precvframe)
+{
+	sint i, res = _SUCCESS;
+	u32	datalen;
+	u8 miccode[8];
+	u8 bmic_err = false;
+	u8 *pframe, *payload, *pframemic;
+	u8   *mickey, idx, *iv;
+	struct	sta_info *stainfo;
+	struct	rx_pkt_attrib *prxattrib = &precvframe->u.hdr.attrib;
+	struct	security_priv *psecuritypriv = &adapter->securitypriv;
+
+	stainfo = r8712_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);
+	if (prxattrib->encrypt == _TKIP_) {
+		/* calculate mic code */
+		if (stainfo != NULL) {
+			if (IS_MCAST(prxattrib->ra)) {
+				iv = precvframe->u.hdr.rx_data +
+				     prxattrib->hdrlen;
+				idx = iv[3];
+				mickey = &psecuritypriv->XGrprxmickey[(((idx >>
+					 6) & 0x3)) - 1].skey[0];
+				if (psecuritypriv->binstallGrpkey == false)
+					return _FAIL;
+			} else
+				mickey = &stainfo->tkiprxmickey.skey[0];
+			/*icv_len included the mic code*/
+			datalen = precvframe->u.hdr.len - prxattrib->hdrlen -
+				  prxattrib->iv_len - prxattrib->icv_len - 8;
+			pframe = precvframe->u.hdr.rx_data;
+			payload = pframe + prxattrib->hdrlen +
+				  prxattrib->iv_len;
+			seccalctkipmic(mickey, pframe, payload, datalen,
+				       &miccode[0],
+				       (unsigned char)prxattrib->priority);
+			pframemic = payload + datalen;
+			bmic_err = false;
+			for (i = 0; i < 8; i++) {
+				if (miccode[i] != *(pframemic + i))
+					bmic_err = true;
+			}
+			if (bmic_err == true) {
+				if (prxattrib->bdecrypted == true)
+					r8712_handle_tkip_mic_err(adapter,
+						(u8)IS_MCAST(prxattrib->ra));
+				res = _FAIL;
+			} else {
+				/* mic checked ok */
+				if ((psecuritypriv->bcheck_grpkey ==
+				     false) && (IS_MCAST(prxattrib->ra) ==
+				     true))
+					psecuritypriv->bcheck_grpkey = true;
+			}
+			recvframe_pull_tail(precvframe, 8);
+		}
+	}
+	return res;
+}
+
+/* decrypt and set the ivlen,icvlen of the recv_frame */
+union recv_frame *r8712_decryptor(struct _adapter *padapter,
+			    union recv_frame *precv_frame)
+{
+	struct rx_pkt_attrib *prxattrib = &precv_frame->u.hdr.attrib;
+	struct security_priv *psecuritypriv = &padapter->securitypriv;
+	union recv_frame *return_packet = precv_frame;
+
+	if ((prxattrib->encrypt > 0) && ((prxattrib->bdecrypted == 0) ||
+	   (psecuritypriv->sw_decrypt == true))) {
+		psecuritypriv->hw_decrypted = false;
+		switch (prxattrib->encrypt) {
+		case _WEP40_:
+		case _WEP104_:
+			r8712_wep_decrypt(padapter, (u8 *)precv_frame);
+			break;
+		case _TKIP_:
+			r8712_tkip_decrypt(padapter, (u8 *)precv_frame);
+			break;
+		case _AES_:
+			r8712_aes_decrypt(padapter, (u8 *)precv_frame);
+			break;
+		default:
+				break;
+		}
+	} else if (prxattrib->bdecrypted == 1)
+		psecuritypriv->hw_decrypted = true;
+	return return_packet;
+}
+/*###set the security information in the recv_frame */
+union recv_frame *r8712_portctrl(struct _adapter *adapter,
+				 union recv_frame *precv_frame)
+{
+	u8 *psta_addr, *ptr;
+	uint auth_alg;
+	struct recv_frame_hdr *pfhdr;
+	struct sta_info *psta;
+	struct	sta_priv *pstapriv;
+	union recv_frame *prtnframe;
+	u16 ether_type = 0;
+
+	pstapriv = &adapter->stapriv;
+	ptr = get_recvframe_data(precv_frame);
+	pfhdr = &precv_frame->u.hdr;
+	psta_addr = pfhdr->attrib.ta;
+	psta = r8712_get_stainfo(pstapriv, psta_addr);
+	auth_alg = adapter->securitypriv.AuthAlgrthm;
+	if (auth_alg == 2) {
+		if ((psta != NULL) && (psta->ieee8021x_blocked)) {
+			/* blocked
+			 * only accept EAPOL frame */
+			prtnframe = precv_frame;
+			/*get ether_type */
+			ptr = ptr + pfhdr->attrib.hdrlen +
+			      pfhdr->attrib.iv_len + LLC_HEADER_SIZE;
+			memcpy(&ether_type, ptr, 2);
+			ether_type = ntohs((unsigned short)ether_type);
+			if (ether_type == 0x888e)
+				prtnframe = precv_frame;
+			else {
+				/*free this frame*/
+				r8712_free_recvframe(precv_frame,
+					 &adapter->recvpriv.free_recv_queue);
+				prtnframe = NULL;
+			}
+		} else {
+			/* allowed
+			 * check decryption status, and decrypt the
+			 * frame if needed */
+			prtnframe = precv_frame;
+			/* check is the EAPOL frame or not (Rekey) */
+			if (ether_type == 0x888e) {
+				/* check Rekey */
+				prtnframe = precv_frame;
+			}
+		}
+	} else
+		prtnframe = precv_frame;
+	return prtnframe;
+}
+
+sint recv_decache(union recv_frame *precv_frame, u8 bretry,
+		  struct stainfo_rxcache *prxcache)
+{
+	sint tid = precv_frame->u.hdr.attrib.priority;
+	u16 seq_ctrl = ((precv_frame->u.hdr.attrib.seq_num&0xffff) << 4) |
+			(precv_frame->u.hdr.attrib.frag_num & 0xf);
+
+	if (tid > 15)
+		return _FAIL;
+	if (seq_ctrl == prxcache->tid_rxseq[tid])
+		return _FAIL;
+	prxcache->tid_rxseq[tid] = seq_ctrl;
+	return _SUCCESS;
+}
+
+sint sta2sta_data_frame(struct _adapter *adapter, union recv_frame *precv_frame,
+			struct sta_info **psta
+)
+{
+	u8 *ptr = precv_frame->u.hdr.rx_data;
+	sint ret = _SUCCESS;
+	struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.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;
+	sint 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))
+			return _FAIL;
+		if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
+			return _FAIL;
+		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)))
+			return _FAIL;
+		sta_addr = pattrib->src;
+	} else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true) {
+		/* For Station mode, sa and bssid should always be BSSID,
+		 * and DA is my mac-address */
+		if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN))
+			return _FAIL;
+	       sta_addr = pattrib->bssid;
+	 } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
+		if (bmcast) {
+			/* For AP mode, if DA == MCAST, then BSSID should
+			 * be also MCAST */
+			if (!IS_MCAST(pattrib->bssid))
+				return _FAIL;
+		} 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))
+				return _FAIL;
+			sta_addr = pattrib->src;
+		}
+	  } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == 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);
+		sta_addr = mybssid;
+	  } else
+		ret  = _FAIL;
+	if (bmcast)
+		*psta = r8712_get_bcmc_stainfo(adapter);
+	else
+		*psta = r8712_get_stainfo(pstapriv, sta_addr); /* get ap_info */
+	if (*psta == NULL) {
+		if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)
+			adapter->mppriv.rx_pktloss++;
+		return _FAIL;
+	}
+	return ret;
+}
+
+sint ap2sta_data_frame(struct _adapter *adapter, union recv_frame *precv_frame,
+		       struct sta_info **psta)
+{
+	u8 *ptr = precv_frame->u.hdr.rx_data;
+	struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
+	struct	sta_priv *pstapriv = &adapter->stapriv;
+	struct	mlme_priv *pmlmepriv = &adapter->mlmepriv;
+	u8 *mybssid  = get_bssid(pmlmepriv);
+	u8 *myhwaddr = myid(&adapter->eeprompriv);
+	sint bmcast = IS_MCAST(pattrib->dst);
+
+	if ((check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true)
+	     && (check_fwstate(pmlmepriv, _FW_LINKED) == true)) {
+		/* if NULL-frame, drop packet */
+		if ((GetFrameSubType(ptr)) == WIFI_DATA_NULL)
+			return _FAIL;
+		/* drop QoS-SubType Data, including QoS NULL,
+		 * excluding QoS-Data */
+		if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) ==
+		     WIFI_QOS_DATA_TYPE) {
+			if (GetFrameSubType(ptr) & (BIT(4) | BIT(5) | BIT(6)))
+				return _FAIL;
+		}
+
+		/* filter packets that SA is myself or multicast or broadcast */
+	       if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
+			return _FAIL;
+
+		/* da should be for me */
+		if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
+			return _FAIL;
+		/* 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)))
+			return _FAIL;
+		if (bmcast)
+			*psta = r8712_get_bcmc_stainfo(adapter);
+		else
+		       *psta = r8712_get_stainfo(pstapriv, pattrib->bssid);
+		if (*psta == NULL)
+			return _FAIL;
+	} 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 = r8712_get_stainfo(pstapriv, pattrib->bssid);
+		if (*psta == NULL)
+			return _FAIL;
+	} else
+		return _FAIL;
+	return _SUCCESS;
+}
+
+sint sta2ap_data_frame(struct _adapter *adapter, union recv_frame *precv_frame,
+		       struct sta_info **psta)
+{
+	struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
+	struct	sta_priv *pstapriv = &adapter->stapriv;
+	struct	mlme_priv *pmlmepriv = &adapter->mlmepriv;
+	unsigned char *mybssid  = get_bssid(pmlmepriv);
+
+	if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
+		/* For AP mode, if DA is non-MCAST, then it must be BSSID,
+		 * and bssid == BSSID
+		 * For AP mode, RA=BSSID, TX=STA(SRC_ADDR), A3=DST_ADDR */
+		if (memcmp(pattrib->bssid, mybssid, ETH_ALEN))
+			return _FAIL;
+		*psta = r8712_get_stainfo(pstapriv, pattrib->src);
+		if (*psta == NULL)
+			return _FAIL;
+	}
+	return _SUCCESS;
+}
+
+sint validate_recv_ctrl_frame(struct _adapter *adapter,
+			      union recv_frame *precv_frame)
+{
+	return _FAIL;
+}
+
+sint validate_recv_mgnt_frame(struct _adapter *adapter,
+			      union recv_frame *precv_frame)
+{
+	return _FAIL;
+}
+
+
+sint validate_recv_data_frame(struct _adapter *adapter,
+			      union recv_frame *precv_frame)
+{
+	int res;
+	u8 bretry;
+	u8 *psa, *pda, *pbssid;
+	struct sta_info *psta = NULL;
+	u8 *ptr = precv_frame->u.hdr.rx_data;
+	struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
+	struct security_priv *psecuritypriv = &adapter->securitypriv;
+
+	bretry = GetRetry(ptr);
+	pda = get_da(ptr);
+	psa = get_sa(ptr);
+	pbssid = get_hdr_bssid(ptr);
+	if (pbssid == NULL)
+		return _FAIL;
+	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);
+		res = sta2sta_data_frame(adapter, precv_frame, &psta);
+		break;
+	case 1:
+		memcpy(pattrib->ra, pda, ETH_ALEN);
+		memcpy(pattrib->ta, pbssid, ETH_ALEN);
+		res = ap2sta_data_frame(adapter, precv_frame, &psta);
+		break;
+	case 2:
+		memcpy(pattrib->ra, pbssid, ETH_ALEN);
+		memcpy(pattrib->ta, psa, ETH_ALEN);
+		res = sta2ap_data_frame(adapter, precv_frame, &psta);
+		break;
+	case 3:
+		memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
+		memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
+		return _FAIL;
+	default:
+		return _FAIL;
+	}
+	if (res == _FAIL)
+		return _FAIL;
+	if (psta == NULL)
+		return _FAIL;
+	else
+		precv_frame->u.hdr.psta = psta;
+	pattrib->amsdu = 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;
+	} else {
+		pattrib->priority = 0;
+		pattrib->hdrlen = (pattrib->to_fr_ds == 3) ? 30 : 24;
+	}
+
+	if (pattrib->order)/*HT-CTRL 11n*/
+		pattrib->hdrlen += 4;
+	precv_frame->u.hdr.preorder_ctrl =
+			 &psta->recvreorder_ctrl[pattrib->priority];
+
+	/* decache, drop duplicate recv packets */
+	if (recv_decache(precv_frame, bretry, &psta->sta_recvpriv.rxcache) ==
+	    _FAIL)
+		return _FAIL;
+
+	if (pattrib->privacy) {
+		GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt,
+			       IS_MCAST(pattrib->ra));
+		SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len,
+			       pattrib->encrypt);
+	} else {
+		pattrib->encrypt = 0;
+		pattrib->iv_len = pattrib->icv_len = 0;
+	}
+	return _SUCCESS;
+}
+
+sint r8712_validate_recv_frame(struct _adapter *adapter,
+			       union 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;
+	sint retval = _SUCCESS;
+	struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
+
+	u8 *ptr = precv_frame->u.hdr.rx_data;
+	u8  ver = (unsigned char)(*ptr) & 0x3;
+
+	/*add version chk*/
+	if (ver != 0)
+		return _FAIL;
+	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);
+	switch (type) {
+	case WIFI_MGT_TYPE: /*mgnt*/
+		retval = validate_recv_mgnt_frame(adapter, precv_frame);
+		break;
+	case WIFI_CTRL_TYPE:/*ctrl*/
+		retval = validate_recv_ctrl_frame(adapter, precv_frame);
+		break;
+	case WIFI_DATA_TYPE: /*data*/
+		pattrib->qos = (subtype & BIT(7)) ? 1 : 0;
+		retval = validate_recv_data_frame(adapter, precv_frame);
+		break;
+	default:
+		return _FAIL;
+	}
+	return retval;
+}
+
+sint r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
+{
+	/*remove the wlanhdr and add the eth_hdr*/
+	sint	rmv_len;
+	u16	eth_type, len;
+	u8	bsnaphdr;
+	u8	*psnap_type;
+	struct ieee80211_snap_hdr *psnap;
+
+	sint ret = _SUCCESS;
+	struct _adapter	*adapter = precvframe->u.hdr.adapter;
+	struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
+
+	u8 *ptr = get_recvframe_data(precvframe); /*point to frame_ctrl field*/
+	struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.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, (void *)rfc1042_header, SNAP_SIZE) &&
+	    (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_IPX, 2)) &&
+	    (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_APPLETALK_AARP, 2))) ||
+	     !memcmp(psnap, (void *)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->u.hdr.len - rmv_len;
+	if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
+		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) {
+		len = htons(len);
+		memcpy(ptr + 12, &len, 2);
+	}
+	return ret;
+}
+
+s32 r8712_recv_entry(union recv_frame *precvframe)
+{
+	struct _adapter *padapter;
+	struct recv_priv *precvpriv;
+	struct	mlme_priv *pmlmepriv;
+	struct recv_stat *prxstat;
+	struct dvobj_priv *pdev;
+	u8 *phead, *pdata, *ptail, *pend;
+
+	struct  __queue *pfree_recv_queue, *ppending_recv_queue;
+	s32 ret = _SUCCESS;
+	struct intf_hdl *pintfhdl;
+
+	padapter = precvframe->u.hdr.adapter;
+	pintfhdl = &padapter->pio_queue->intf;
+	pmlmepriv = &padapter->mlmepriv;
+	precvpriv = &(padapter->recvpriv);
+	pdev = &padapter->dvobjpriv;
+	pfree_recv_queue = &(precvpriv->free_recv_queue);
+	ppending_recv_queue = &(precvpriv->recv_pending_queue);
+	phead = precvframe->u.hdr.rx_head;
+	pdata = precvframe->u.hdr.rx_data;
+	ptail = precvframe->u.hdr.rx_tail;
+	pend = precvframe->u.hdr.rx_end;
+	prxstat = (struct recv_stat *)phead;
+
+	padapter->ledpriv.LedControlHandler(padapter, LED_CTL_RX);
+
+	ret = recv_func(padapter, precvframe);
+	if (ret == _FAIL)
+		goto _recv_entry_drop;
+	precvpriv->rx_pkts++;
+	precvpriv->rx_bytes += (uint)(precvframe->u.hdr.rx_tail -
+				precvframe->u.hdr.rx_data);
+	return ret;
+_recv_entry_drop:
+	precvpriv->rx_drop++;
+	padapter->mppriv.rx_pktloss = precvpriv->rx_drop;
+	return ret;
+}