drivers/net/wireless/libertas/rx.c - kernel/msm-4.9 - Gitiles

 /**
   * This file contains the handling of RX in wlan driver.
   */
 #include <linux/etherdevice.h>
 #include <linux/types.h>

 #include "hostcmd.h"
 #include "radiotap.h"
 #include "decl.h"
 #include "dev.h"
 #include "wext.h"

 struct eth803hdr {
 	u8 dest_addr[6];
 	u8 src_addr[6];
 	u16 h803_len;
 } __attribute__ ((packed));

 struct rfc1042hdr {
 	u8 llc_dsap;
 	u8 llc_ssap;
 	u8 llc_ctrl;
 	u8 snap_oui[3];
 	u16 snap_type;
 } __attribute__ ((packed));

 struct rxpackethdr {
 	struct rxpd rx_pd;
 	struct eth803hdr eth803_hdr;
 	struct rfc1042hdr rfc1042_hdr;
 } __attribute__ ((packed));

 struct rx80211packethdr {
 	struct rxpd rx_pd;
 	void *eth80211_hdr;
 } __attribute__ ((packed));

 static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb);

 /**
  *  @brief This function computes the avgSNR .
  *
  *  @param priv    A pointer to wlan_private structure
  *  @return 	   avgSNR
  */
 static u8 wlan_getavgsnr(wlan_private * priv)
 {
 	u8 i;
 	u16 temp = 0;
 	wlan_adapter *adapter = priv->adapter;
 	if (adapter->numSNRNF == 0)
 		return 0;
 	for (i = 0; i < adapter->numSNRNF; i++)
 		temp += adapter->rawSNR[i];
 	return (u8) (temp / adapter->numSNRNF);

 }

 /**
  *  @brief This function computes the AvgNF
  *
  *  @param priv    A pointer to wlan_private structure
  *  @return 	   AvgNF
  */
 static u8 wlan_getavgnf(wlan_private * priv)
 {
 	u8 i;
 	u16 temp = 0;
 	wlan_adapter *adapter = priv->adapter;
 	if (adapter->numSNRNF == 0)
 		return 0;
 	for (i = 0; i < adapter->numSNRNF; i++)
 		temp += adapter->rawNF[i];
 	return (u8) (temp / adapter->numSNRNF);

 }

 /**
  *  @brief This function save the raw SNR/NF to our internel buffer
  *
  *  @param priv    A pointer to wlan_private structure
  *  @param prxpd   A pointer to rxpd structure of received packet
  *  @return 	   n/a
  */
 static void wlan_save_rawSNRNF(wlan_private * priv, struct rxpd *p_rx_pd)
 {
 	wlan_adapter *adapter = priv->adapter;
 	if (adapter->numSNRNF < adapter->data_avg_factor)
 		adapter->numSNRNF++;
 	adapter->rawSNR[adapter->nextSNRNF] = p_rx_pd->snr;
 	adapter->rawNF[adapter->nextSNRNF] = p_rx_pd->nf;
 	adapter->nextSNRNF++;
 	if (adapter->nextSNRNF >= adapter->data_avg_factor)
 		adapter->nextSNRNF = 0;
 	return;
 }

 /**
  *  @brief This function computes the RSSI in received packet.
  *
  *  @param priv    A pointer to wlan_private structure
  *  @param prxpd   A pointer to rxpd structure of received packet
  *  @return 	   n/a
  */
 static void wlan_compute_rssi(wlan_private * priv, struct rxpd *p_rx_pd)
 {
 	wlan_adapter *adapter = priv->adapter;

 	lbs_deb_enter(LBS_DEB_RX);

 	lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf);
 	lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n",
 	       adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
 	       adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);

 	adapter->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
 	adapter->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
 	wlan_save_rawSNRNF(priv, p_rx_pd);

 	adapter->rxpd_rate = p_rx_pd->rx_rate;

 	adapter->SNR[TYPE_RXPD][TYPE_AVG] = wlan_getavgsnr(priv) * AVG_SCALE;
 	adapter->NF[TYPE_RXPD][TYPE_AVG] = wlan_getavgnf(priv) * AVG_SCALE;
 	lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
 	       adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
 	       adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);

 	adapter->RSSI[TYPE_RXPD][TYPE_NOAVG] =
 	    CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_NOAVG],
 		     adapter->NF[TYPE_RXPD][TYPE_NOAVG]);

 	adapter->RSSI[TYPE_RXPD][TYPE_AVG] =
 	    CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
 		     adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);

 	lbs_deb_leave(LBS_DEB_RX);
 }

 void libertas_upload_rx_packet(wlan_private * priv, struct sk_buff *skb)
 {
 	lbs_deb_rx("skb->data %p\n", skb->data);

 	if (priv->mesh_dev && IS_MESH_FRAME(skb))
 		skb->dev = priv->mesh_dev;
 	else
 		skb->dev = priv->wlan_dev.netdev;
 	skb->protocol = eth_type_trans(skb, priv->wlan_dev.netdev);
 	skb->ip_summed = CHECKSUM_UNNECESSARY;

 	netif_rx(skb);
 }

 /**
  *  @brief This function processes received packet and forwards it
  *  to kernel/upper layer
  *
  *  @param priv    A pointer to wlan_private
  *  @param skb     A pointer to skb which includes the received packet
  *  @return 	   0 or -1
  */
 int libertas_process_rxed_packet(wlan_private * priv, struct sk_buff *skb)
 {
 	wlan_adapter *adapter = priv->adapter;
 	int ret = 0;

 	struct rxpackethdr *p_rx_pkt;
 	struct rxpd *p_rx_pd;

 	int hdrchop;
 	struct ethhdr *p_ethhdr;

 	const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

 	lbs_deb_enter(LBS_DEB_RX);

 	if (priv->adapter->debugmode & MRVDRV_DEBUG_RX_PATH)
 		lbs_dbg_hex("RX packet: ", skb->data,
 			 min_t(unsigned int, skb->len, 100));

 	if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
 		return process_rxed_802_11_packet(priv, skb);

 	p_rx_pkt = (struct rxpackethdr *) skb->data;
 	p_rx_pd = &p_rx_pkt->rx_pd;
 	if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
 		SET_MESH_FRAME(skb);
 	else
 		UNSET_MESH_FRAME(skb);

 	lbs_dbg_hex("RX Data: Before chop rxpd", skb->data,
 		 min_t(unsigned int, skb->len, 100));

 	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
 		lbs_deb_rx("rx err: frame received with bad length\n");
 		priv->stats.rx_length_errors++;
 		ret = 0;
 		goto done;
 	}

 	/*
 	 * Check rxpd status and update 802.3 stat,
 	 */
 	if (!(p_rx_pd->status & MRVDRV_RXPD_STATUS_OK)) {
 		lbs_deb_rx("rx err: frame received with bad status\n");
 		lbs_pr_alert("rxpd not ok\n");
 		priv->stats.rx_errors++;
 		ret = 0;
 		goto done;
 	}

 	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
 	       skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));

 	lbs_dbg_hex("RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
 		sizeof(p_rx_pkt->eth803_hdr.dest_addr));
 	lbs_dbg_hex("RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
 		sizeof(p_rx_pkt->eth803_hdr.src_addr));

 	if (memcmp(&p_rx_pkt->rfc1042_hdr,
 		   rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
 		/*
 		 *  Replace the 803 header and rfc1042 header (llc/snap) with an
 		 *    EthernetII header, keep the src/dst and snap_type (ethertype)
 		 *
 		 *  The firmware only passes up SNAP frames converting
 		 *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
 		 *
 		 *  To create the Ethernet II, just move the src, dst address right
 		 *    before the snap_type.
 		 */
 		p_ethhdr = (struct ethhdr *)
 		    ((u8 *) & p_rx_pkt->eth803_hdr
 		     + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
 		     - sizeof(p_rx_pkt->eth803_hdr.dest_addr)
 		     - sizeof(p_rx_pkt->eth803_hdr.src_addr)
 		     - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));

 		memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
 		       sizeof(p_ethhdr->h_source));
 		memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
 		       sizeof(p_ethhdr->h_dest));

 		/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
 		 *   that was removed
 		 */
 		hdrchop = (u8 *) p_ethhdr - (u8 *) p_rx_pkt;
 	} else {
 		lbs_dbg_hex("RX Data: LLC/SNAP",
 			(u8 *) & p_rx_pkt->rfc1042_hdr,
 			sizeof(p_rx_pkt->rfc1042_hdr));

 		/* Chop off the rxpd */
 		hdrchop = (u8 *) & p_rx_pkt->eth803_hdr - (u8 *) p_rx_pkt;
 	}

 	/* Chop off the leading header bytes so the skb points to the start of
 	 *   either the reconstructed EthII frame or the 802.2/llc/snap frame
 	 */
 	skb_pull(skb, hdrchop);

 	/* Take the data rate from the rxpd structure
 	 * only if the rate is auto
 	 */
 	if (adapter->is_datarate_auto)
 		adapter->datarate = libertas_index_to_data_rate(p_rx_pd->rx_rate);

 	wlan_compute_rssi(priv, p_rx_pd);

 	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
 	priv->stats.rx_bytes += skb->len;
 	priv->stats.rx_packets++;

 	libertas_upload_rx_packet(priv, skb);

 	ret = 0;
 done:
 	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
 	return ret;
 }

 /**
  *  @brief This function converts Tx/Rx rates from the Marvell WLAN format
  *  (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
  *
  *  @param rate    Input rate
  *  @return 	   Output Rate (0 if invalid)
  */
 static u8 convert_mv_rate_to_radiotap(u8 rate)
 {
 	switch (rate) {
 	case 0:		/*   1 Mbps */
 		return 2;
 	case 1:		/*   2 Mbps */
 		return 4;
 	case 2:		/* 5.5 Mbps */
 		return 11;
 	case 3:		/*  11 Mbps */
 		return 22;
 	case 4:		/*   6 Mbps */
 		return 12;
 	case 5:		/*   9 Mbps */
 		return 18;
 	case 6:		/*  12 Mbps */
 		return 24;
 	case 7:		/*  18 Mbps */
 		return 36;
 	case 8:		/*  24 Mbps */
 		return 48;
 	case 9:		/*  36 Mbps */
 		return 72;
 	case 10:		/*  48 Mbps */
 		return 96;
 	case 11:		/*  54 Mbps */
 		return 108;
 	}
 	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
 	return 0;
 }

 /**
  *  @brief This function processes a received 802.11 packet and forwards it
  *  to kernel/upper layer
  *
  *  @param priv    A pointer to wlan_private
  *  @param skb     A pointer to skb which includes the received packet
  *  @return 	   0 or -1
  */
 static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb)
 {
 	wlan_adapter *adapter = priv->adapter;
 	int ret = 0;

 	struct rx80211packethdr *p_rx_pkt;
 	struct rxpd *prxpd;
 	struct rx_radiotap_hdr radiotap_hdr;
 	struct rx_radiotap_hdr *pradiotap_hdr;

 	lbs_deb_enter(LBS_DEB_RX);

 	p_rx_pkt = (struct rx80211packethdr *) skb->data;
 	prxpd = &p_rx_pkt->rx_pd;

 	// lbs_dbg_hex("RX Data: Before chop rxpd", skb->data, min(skb->len, 100));

 	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
 		lbs_deb_rx("rx err: frame received wit bad length\n");
 		priv->stats.rx_length_errors++;
 		ret = 0;
 		goto done;
 	}

 	/*
 	 * Check rxpd status and update 802.3 stat,
 	 */
 	if (!(prxpd->status & MRVDRV_RXPD_STATUS_OK)) {
 		//lbs_deb_rx("rx err: frame received with bad status\n");
 		priv->stats.rx_errors++;
 	}

 	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
 	       skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));

 	/* create the exported radio header */
 	switch (priv->adapter->radiomode) {
 	case WLAN_RADIOMODE_NONE:
 		/* no radio header */
 		/* chop the rxpd */
 		skb_pull(skb, sizeof(struct rxpd));
 		break;

 	case WLAN_RADIOMODE_RADIOTAP:
 		/* radiotap header */
 		radiotap_hdr.hdr.it_version = 0;
 		/* XXX must check this value for pad */
 		radiotap_hdr.hdr.it_pad = 0;
 		radiotap_hdr.hdr.it_len = sizeof(struct rx_radiotap_hdr);
 		radiotap_hdr.hdr.it_present = RX_RADIOTAP_PRESENT;
 		/* unknown values */
 		radiotap_hdr.flags = 0;
 		radiotap_hdr.chan_freq = 0;
 		radiotap_hdr.chan_flags = 0;
 		radiotap_hdr.antenna = 0;
 		/* known values */
 		radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
 		/* XXX must check no carryout */
 		radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
 		radiotap_hdr.rx_flags = 0;
 		if (!(prxpd->status & MRVDRV_RXPD_STATUS_OK))
 			radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS;
 		//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);

 		// lbs_dbg_hex1("RX radiomode packet BEF: ", skb->data, min(skb->len, 100));

 		/* chop the rxpd */
 		skb_pull(skb, sizeof(struct rxpd));

 		/* add space for the new radio header */
 		if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
 		    pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0,
 				     GFP_ATOMIC)) {
 			lbs_pr_alert("%s: couldn't pskb_expand_head\n",
 			       __func__);
 		}

 		pradiotap_hdr =
 		    (struct rx_radiotap_hdr *)skb_push(skb,
 						     sizeof(struct
 							    rx_radiotap_hdr));
 		memcpy(pradiotap_hdr, &radiotap_hdr,
 		       sizeof(struct rx_radiotap_hdr));
 		//lbs_dbg_hex1("RX radiomode packet AFT: ", skb->data, min(skb->len, 100));
 		break;

 	default:
 		/* unknown header */
 		lbs_pr_alert("Unknown radiomode %i\n",
 		       priv->adapter->radiomode);
 		/* don't export any header */
 		/* chop the rxpd */
 		skb_pull(skb, sizeof(struct rxpd));
 		break;
 	}

 	/* Take the data rate from the rxpd structure
 	 * only if the rate is auto
 	 */
 	if (adapter->is_datarate_auto) {
 		adapter->datarate = libertas_index_to_data_rate(prxpd->rx_rate);
 	}

 	wlan_compute_rssi(priv, prxpd);

 	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
 	priv->stats.rx_bytes += skb->len;
 	priv->stats.rx_packets++;

 	libertas_upload_rx_packet(priv, skb);

 	ret = 0;

 done:
 	skb->protocol = __constant_htons(0x0019);	/* ETH_P_80211_RAW */
 	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
 	return ret;
 }
	/**
	* This file contains the handling of RX in wlan driver.
	*/
	#include <linux/etherdevice.h>
	#include <linux/types.h>

	#include "hostcmd.h"
	#include "radiotap.h"
	#include "decl.h"
	#include "dev.h"
	#include "wext.h"

	struct eth803hdr {
	u8 dest_addr[6];
	u8 src_addr[6];
	u16 h803_len;
	} __attribute__ ((packed));

	struct rfc1042hdr {
	u8 llc_dsap;
	u8 llc_ssap;
	u8 llc_ctrl;
	u8 snap_oui[3];
	u16 snap_type;
	} __attribute__ ((packed));

	struct rxpackethdr {
	struct rxpd rx_pd;
	struct eth803hdr eth803_hdr;
	struct rfc1042hdr rfc1042_hdr;
	} __attribute__ ((packed));

	struct rx80211packethdr {
	struct rxpd rx_pd;
	void *eth80211_hdr;
	} __attribute__ ((packed));

	static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb);

	/**
	* @brief This function computes the avgSNR .
	*
	* @param priv A pointer to wlan_private structure
	* @return avgSNR
	*/
	static u8 wlan_getavgsnr(wlan_private * priv)
	{
	u8 i;
	u16 temp = 0;
	wlan_adapter *adapter = priv->adapter;
	if (adapter->numSNRNF == 0)
	return 0;
	for (i = 0; i < adapter->numSNRNF; i++)
	temp += adapter->rawSNR[i];
	return (u8) (temp / adapter->numSNRNF);

	}

	/**
	* @brief This function computes the AvgNF
	*
	* @param priv A pointer to wlan_private structure
	* @return AvgNF
	*/
	static u8 wlan_getavgnf(wlan_private * priv)
	{
	u8 i;
	u16 temp = 0;
	wlan_adapter *adapter = priv->adapter;
	if (adapter->numSNRNF == 0)
	return 0;
	for (i = 0; i < adapter->numSNRNF; i++)
	temp += adapter->rawNF[i];
	return (u8) (temp / adapter->numSNRNF);

	}

	/**
	* @brief This function save the raw SNR/NF to our internel buffer
	*
	* @param priv A pointer to wlan_private structure
	* @param prxpd A pointer to rxpd structure of received packet
	* @return n/a
	*/
	static void wlan_save_rawSNRNF(wlan_private * priv, struct rxpd *p_rx_pd)
	{
	wlan_adapter *adapter = priv->adapter;
	if (adapter->numSNRNF < adapter->data_avg_factor)
	adapter->numSNRNF++;
	adapter->rawSNR[adapter->nextSNRNF] = p_rx_pd->snr;
	adapter->rawNF[adapter->nextSNRNF] = p_rx_pd->nf;
	adapter->nextSNRNF++;
	if (adapter->nextSNRNF >= adapter->data_avg_factor)
	adapter->nextSNRNF = 0;
	return;
	}

	/**
	* @brief This function computes the RSSI in received packet.
	*
	* @param priv A pointer to wlan_private structure
	* @param prxpd A pointer to rxpd structure of received packet
	* @return n/a
	*/
	static void wlan_compute_rssi(wlan_private * priv, struct rxpd *p_rx_pd)
	{
	wlan_adapter *adapter = priv->adapter;

	lbs_deb_enter(LBS_DEB_RX);

	lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf);
	lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n",
	adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);

	adapter->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
	adapter->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
	wlan_save_rawSNRNF(priv, p_rx_pd);

	adapter->rxpd_rate = p_rx_pd->rx_rate;

	adapter->SNR[TYPE_RXPD][TYPE_AVG] = wlan_getavgsnr(priv) * AVG_SCALE;
	adapter->NF[TYPE_RXPD][TYPE_AVG] = wlan_getavgnf(priv) * AVG_SCALE;
	lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
	adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);

	adapter->RSSI[TYPE_RXPD][TYPE_NOAVG] =
	CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_NOAVG],
	adapter->NF[TYPE_RXPD][TYPE_NOAVG]);

	adapter->RSSI[TYPE_RXPD][TYPE_AVG] =
	CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);

	lbs_deb_leave(LBS_DEB_RX);
	}

	void libertas_upload_rx_packet(wlan_private * priv, struct sk_buff *skb)
	{
	lbs_deb_rx("skb->data %p\n", skb->data);

	if (priv->mesh_dev && IS_MESH_FRAME(skb))
	skb->dev = priv->mesh_dev;
	else
	skb->dev = priv->wlan_dev.netdev;
	skb->protocol = eth_type_trans(skb, priv->wlan_dev.netdev);
	skb->ip_summed = CHECKSUM_UNNECESSARY;

	netif_rx(skb);
	}

	/**
	* @brief This function processes received packet and forwards it
	* to kernel/upper layer
	*
	* @param priv A pointer to wlan_private
	* @param skb A pointer to skb which includes the received packet
	* @return 0 or -1
	*/
	int libertas_process_rxed_packet(wlan_private * priv, struct sk_buff *skb)
	{
	wlan_adapter *adapter = priv->adapter;
	int ret = 0;

	struct rxpackethdr *p_rx_pkt;
	struct rxpd *p_rx_pd;

	int hdrchop;
	struct ethhdr *p_ethhdr;

	const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

	lbs_deb_enter(LBS_DEB_RX);

	if (priv->adapter->debugmode & MRVDRV_DEBUG_RX_PATH)
	lbs_dbg_hex("RX packet: ", skb->data,
	min_t(unsigned int, skb->len, 100));

	if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
	return process_rxed_802_11_packet(priv, skb);

	p_rx_pkt = (struct rxpackethdr *) skb->data;
	p_rx_pd = &p_rx_pkt->rx_pd;
	if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
	SET_MESH_FRAME(skb);
	else
	UNSET_MESH_FRAME(skb);

	lbs_dbg_hex("RX Data: Before chop rxpd", skb->data,
	min_t(unsigned int, skb->len, 100));

	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
	lbs_deb_rx("rx err: frame received with bad length\n");
	priv->stats.rx_length_errors++;
	ret = 0;
	goto done;
	}

	/*
	* Check rxpd status and update 802.3 stat,
	*/
	if (!(p_rx_pd->status & MRVDRV_RXPD_STATUS_OK)) {
	lbs_deb_rx("rx err: frame received with bad status\n");
	lbs_pr_alert("rxpd not ok\n");
	priv->stats.rx_errors++;
	ret = 0;
	goto done;
	}

	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));

	lbs_dbg_hex("RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
	sizeof(p_rx_pkt->eth803_hdr.dest_addr));
	lbs_dbg_hex("RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
	sizeof(p_rx_pkt->eth803_hdr.src_addr));

	if (memcmp(&p_rx_pkt->rfc1042_hdr,
	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
	/*
	* Replace the 803 header and rfc1042 header (llc/snap) with an
	* EthernetII header, keep the src/dst and snap_type (ethertype)
	*
	* The firmware only passes up SNAP frames converting
	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	*
	* To create the Ethernet II, just move the src, dst address right
	* before the snap_type.
	*/
	p_ethhdr = (struct ethhdr *)
	((u8 *) & p_rx_pkt->eth803_hdr
	+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
	- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
	- sizeof(p_rx_pkt->eth803_hdr.src_addr)
	- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));

	memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
	sizeof(p_ethhdr->h_source));
	memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
	sizeof(p_ethhdr->h_dest));

	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
	* that was removed
	*/
	hdrchop = (u8 ) p_ethhdr - (u8 ) p_rx_pkt;
	} else {
	lbs_dbg_hex("RX Data: LLC/SNAP",
	(u8 *) & p_rx_pkt->rfc1042_hdr,
	sizeof(p_rx_pkt->rfc1042_hdr));

	/* Chop off the rxpd */
	hdrchop = (u8 ) & p_rx_pkt->eth803_hdr - (u8 ) p_rx_pkt;
	}

	/* Chop off the leading header bytes so the skb points to the start of
	* either the reconstructed EthII frame or the 802.2/llc/snap frame
	*/
	skb_pull(skb, hdrchop);

	/* Take the data rate from the rxpd structure
	* only if the rate is auto
	*/
	if (adapter->is_datarate_auto)
	adapter->datarate = libertas_index_to_data_rate(p_rx_pd->rx_rate);

	wlan_compute_rssi(priv, p_rx_pd);

	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
	priv->stats.rx_bytes += skb->len;
	priv->stats.rx_packets++;

	libertas_upload_rx_packet(priv, skb);

	ret = 0;
	done:
	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
	return ret;
	}

	/**
	* @brief This function converts Tx/Rx rates from the Marvell WLAN format
	* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
	*
	* @param rate Input rate
	* @return Output Rate (0 if invalid)
	*/
	static u8 convert_mv_rate_to_radiotap(u8 rate)
	{
	switch (rate) {
	case 0: /* 1 Mbps */
	return 2;
	case 1: /* 2 Mbps */
	return 4;
	case 2: /* 5.5 Mbps */
	return 11;
	case 3: /* 11 Mbps */
	return 22;
	case 4: /* 6 Mbps */
	return 12;
	case 5: /* 9 Mbps */
	return 18;
	case 6: /* 12 Mbps */
	return 24;
	case 7: /* 18 Mbps */
	return 36;
	case 8: /* 24 Mbps */
	return 48;
	case 9: /* 36 Mbps */
	return 72;
	case 10: /* 48 Mbps */
	return 96;
	case 11: /* 54 Mbps */
	return 108;
	}
	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
	return 0;
	}

	/**
	* @brief This function processes a received 802.11 packet and forwards it
	* to kernel/upper layer
	*
	* @param priv A pointer to wlan_private
	* @param skb A pointer to skb which includes the received packet
	* @return 0 or -1
	*/
	static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb)
	{
	wlan_adapter *adapter = priv->adapter;
	int ret = 0;

	struct rx80211packethdr *p_rx_pkt;
	struct rxpd *prxpd;
	struct rx_radiotap_hdr radiotap_hdr;
	struct rx_radiotap_hdr *pradiotap_hdr;

	lbs_deb_enter(LBS_DEB_RX);

	p_rx_pkt = (struct rx80211packethdr *) skb->data;
	prxpd = &p_rx_pkt->rx_pd;

	// lbs_dbg_hex("RX Data: Before chop rxpd", skb->data, min(skb->len, 100));

	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
	lbs_deb_rx("rx err: frame received wit bad length\n");
	priv->stats.rx_length_errors++;
	ret = 0;
	goto done;
	}

	/*
	* Check rxpd status and update 802.3 stat,
	*/
	if (!(prxpd->status & MRVDRV_RXPD_STATUS_OK)) {
	//lbs_deb_rx("rx err: frame received with bad status\n");
	priv->stats.rx_errors++;
	}

	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));

	/* create the exported radio header */
	switch (priv->adapter->radiomode) {
	case WLAN_RADIOMODE_NONE:
	/* no radio header */
	/* chop the rxpd */
	skb_pull(skb, sizeof(struct rxpd));
	break;

	case WLAN_RADIOMODE_RADIOTAP:
	/* radiotap header */
	radiotap_hdr.hdr.it_version = 0;
	/* XXX must check this value for pad */
	radiotap_hdr.hdr.it_pad = 0;
	radiotap_hdr.hdr.it_len = sizeof(struct rx_radiotap_hdr);
	radiotap_hdr.hdr.it_present = RX_RADIOTAP_PRESENT;
	/* unknown values */
	radiotap_hdr.flags = 0;
	radiotap_hdr.chan_freq = 0;
	radiotap_hdr.chan_flags = 0;
	radiotap_hdr.antenna = 0;
	/* known values */
	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	/* XXX must check no carryout */
	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
	radiotap_hdr.rx_flags = 0;
	if (!(prxpd->status & MRVDRV_RXPD_STATUS_OK))
	radiotap_hdr.rx_flags \|= IEEE80211_RADIOTAP_F_RX_BADFCS;
	//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);

	// lbs_dbg_hex1("RX radiomode packet BEF: ", skb->data, min(skb->len, 100));

	/* chop the rxpd */
	skb_pull(skb, sizeof(struct rxpd));

	/* add space for the new radio header */
	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
	pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0,
	GFP_ATOMIC)) {
	lbs_pr_alert("%s: couldn't pskb_expand_head\n",
	__func__);
	}

	pradiotap_hdr =
	(struct rx_radiotap_hdr *)skb_push(skb,
	sizeof(struct
	rx_radiotap_hdr));
	memcpy(pradiotap_hdr, &radiotap_hdr,
	sizeof(struct rx_radiotap_hdr));
	//lbs_dbg_hex1("RX radiomode packet AFT: ", skb->data, min(skb->len, 100));
	break;

	default:
	/* unknown header */
	lbs_pr_alert("Unknown radiomode %i\n",
	priv->adapter->radiomode);
	/* don't export any header */
	/* chop the rxpd */
	skb_pull(skb, sizeof(struct rxpd));
	break;
	}

	/* Take the data rate from the rxpd structure
	* only if the rate is auto
	*/
	if (adapter->is_datarate_auto) {
	adapter->datarate = libertas_index_to_data_rate(prxpd->rx_rate);
	}

	wlan_compute_rssi(priv, prxpd);

	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
	priv->stats.rx_bytes += skb->len;
	priv->stats.rx_packets++;

	libertas_upload_rx_packet(priv, skb);

	ret = 0;

	done:
	skb->protocol = __constant_htons(0x0019); /* ETH_P_80211_RAW */
	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
	return ret;
	}