[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / libertas / rx.c

/**
  * 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(struct lbs_private *priv,
	struct sk_buff *skb);

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

}

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

}

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

/**
 *  @brief This function computes the RSSI in received packet.
 *
 *  @param priv    A pointer to struct lbs_private structure
 *  @param prxpd   A pointer to rxpd structure of received packet
 *  @return 	   n/a
 */
static void lbs_compute_rssi(struct lbs_private *priv, struct rxpd *p_rx_pd)
{

	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",
	       priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	       priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);

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

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

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

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

	lbs_deb_leave(LBS_DEB_RX);
}

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

	if (priv->monitormode != LBS_MONITOR_OFF) {
		skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
	} else {
		if (priv->mesh_dev && IS_MESH_FRAME(skb))
			skb->protocol = eth_type_trans(skb, priv->mesh_dev);
		else
			skb->protocol = eth_type_trans(skb, priv->dev);
	}
	skb->ip_summed = CHECKSUM_NONE;
	netif_rx(skb);
}

/**
 *  @brief This function processes received packet and forwards it
 *  to kernel/upper layer
 *
 *  @param priv    A pointer to struct lbs_private
 *  @param skb     A pointer to skb which includes the received packet
 *  @return 	   0 or -1
 */
int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
{
	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->monitormode != LBS_MONITOR_OFF)
		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_deb_hex(LBS_DEB_RX, "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 & cpu_to_le16(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_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
		sizeof(p_rx_pkt->eth803_hdr.dest_addr));
	lbs_deb_hex(LBS_DEB_RX, "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_deb_hex(LBS_DEB_RX, "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 (priv->auto_rate)
		priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);

	lbs_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++;

	lbs_upload_rx_packet(priv, skb);

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

/**
 *  @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: reserved */
	case 5:		/*   6 Mbps */
		return 12;
	case 6:		/*   9 Mbps */
		return 18;
	case 7:		/*  12 Mbps */
		return 24;
	case 8:		/*  18 Mbps */
		return 36;
	case 9:		/*  24 Mbps */
		return 48;
	case 10:		/*  36 Mbps */
		return 72;
	case 11:		/*  48 Mbps */
		return 96;
	case 12:		/*  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 struct lbs_private
 *  @param skb     A pointer to skb which includes the received packet
 *  @return 	   0 or -1
 */
static int process_rxed_802_11_packet(struct lbs_private *priv,
	struct sk_buff *skb)
{
	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_deb_hex(LBS_DEB_RX, "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 & cpu_to_le16(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 */

	/* 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 = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
	radiotap_hdr.hdr.it_present = cpu_to_le32 (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 & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
		radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS;
	//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);

	/* 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 = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
	memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));

	/* Take the data rate from the rxpd structure
	 * only if the rate is auto
	 */
	if (priv->auto_rate)
		priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);

	lbs_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++;

	lbs_upload_rx_packet(priv, skb);

	ret = 0;

done:
	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
	return ret;
}
Commit	Line	Data
876c9d3a MT	1	/**
	2	* This file contains the handling of RX in wlan driver.
	3	*/
	4	#include <linux/etherdevice.h>
	5	#include <linux/types.h>
	6
	7	#include "hostcmd.h"
	8	#include "radiotap.h"
	9	#include "decl.h"
	10	#include "dev.h"
	11	#include "wext.h"
	12
	13	struct eth803hdr {
	14	u8 dest_addr[6];
	15	u8 src_addr[6];
	16	u16 h803_len;
	17	} __attribute__ ((packed));
	18
	19	struct rfc1042hdr {
	20	u8 llc_dsap;
	21	u8 llc_ssap;
	22	u8 llc_ctrl;
	23	u8 snap_oui[3];
	24	u16 snap_type;
	25	} __attribute__ ((packed));
	26
	27	struct rxpackethdr {
	28	struct rxpd rx_pd;
	29	struct eth803hdr eth803_hdr;
	30	struct rfc1042hdr rfc1042_hdr;
	31	} __attribute__ ((packed));
	32
	33	struct rx80211packethdr {
	34	struct rxpd rx_pd;
	35	void *eth80211_hdr;
	36	} __attribute__ ((packed));
	37
69f9032d HS	38	static int process_rxed_802_11_packet(struct lbs_private *priv,
69f9032d HS	39	struct sk_buff *skb);
876c9d3a MT	40
	41	/**
	42	* @brief This function computes the avgSNR .
	43	*
69f9032d	44	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	45	* @return avgSNR
876c9d3a MT	46	*/
69f9032d	47	static u8 lbs_getavgsnr(struct lbs_private *priv)
876c9d3a MT	48	{
	49	u8 i;
	50	u16 temp = 0;
aa21c004	51	if (priv->numSNRNF == 0)
876c9d3a	52	return 0;
aa21c004 DW	53	for (i = 0; i < priv->numSNRNF; i++)
	54	temp += priv->rawSNR[i];
	55	return (u8) (temp / priv->numSNRNF);
876c9d3a MT	56
	57	}
	58
	59	/**
	60	* @brief This function computes the AvgNF
	61	*
69f9032d	62	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	63	* @return AvgNF
876c9d3a MT	64	*/
69f9032d	65	static u8 lbs_getavgnf(struct lbs_private *priv)
876c9d3a MT	66	{
	67	u8 i;
	68	u16 temp = 0;
aa21c004	69	if (priv->numSNRNF == 0)
876c9d3a	70	return 0;
aa21c004 DW	71	for (i = 0; i < priv->numSNRNF; i++)
	72	temp += priv->rawNF[i];
	73	return (u8) (temp / priv->numSNRNF);
876c9d3a MT	74
	75	}
	76
	77	/**
	78	* @brief This function save the raw SNR/NF to our internel buffer
	79	*
69f9032d	80	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	81	* @param prxpd A pointer to rxpd structure of received packet
	82	* @return n/a
	83	*/
69f9032d	84	static void lbs_save_rawSNRNF(struct lbs_private priv, struct rxpd p_rx_pd)
876c9d3a	85	{
aa21c004 DW	86	if (priv->numSNRNF < DEFAULT_DATA_AVG_FACTOR)
	87	priv->numSNRNF++;
	88	priv->rawSNR[priv->nextSNRNF] = p_rx_pd->snr;
	89	priv->rawNF[priv->nextSNRNF] = p_rx_pd->nf;
	90	priv->nextSNRNF++;
	91	if (priv->nextSNRNF >= DEFAULT_DATA_AVG_FACTOR)
	92	priv->nextSNRNF = 0;
876c9d3a MT	93	return;
	94	}
	95
	96	/**
	97	* @brief This function computes the RSSI in received packet.
	98	*
69f9032d	99	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	100	* @param prxpd A pointer to rxpd structure of received packet
	101	* @return n/a
	102	*/
69f9032d	103	static void lbs_compute_rssi(struct lbs_private priv, struct rxpd p_rx_pd)
876c9d3a	104	{
876c9d3a	105
9012b28a	106	lbs_deb_enter(LBS_DEB_RX);
876c9d3a	107
9012b28a HS	108	lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf);
9012b28a HS	109	lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n",
aa21c004 DW	110	priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
aa21c004 DW	111	priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
876c9d3a	112
aa21c004 DW	113	priv->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
aa21c004 DW	114	priv->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
10078321	115	lbs_save_rawSNRNF(priv, p_rx_pd);
876c9d3a	116
aa21c004 DW	117	priv->SNR[TYPE_RXPD][TYPE_AVG] = lbs_getavgsnr(priv) * AVG_SCALE;
aa21c004 DW	118	priv->NF[TYPE_RXPD][TYPE_AVG] = lbs_getavgnf(priv) * AVG_SCALE;
9012b28a	119	lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
aa21c004 DW	120	priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
aa21c004 DW	121	priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
876c9d3a	122
aa21c004 DW	123	priv->RSSI[TYPE_RXPD][TYPE_NOAVG] =
	124	CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_NOAVG],
	125	priv->NF[TYPE_RXPD][TYPE_NOAVG]);
876c9d3a	126
aa21c004 DW	127	priv->RSSI[TYPE_RXPD][TYPE_AVG] =
	128	CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	129	priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
876c9d3a	130
9012b28a	131	lbs_deb_leave(LBS_DEB_RX);
876c9d3a MT	132	}
876c9d3a MT	133
69f9032d	134	void lbs_upload_rx_packet(struct lbs_private priv, struct sk_buff skb)
876c9d3a	135	{
9012b28a	136	lbs_deb_rx("skb->data %p\n", skb->data);
876c9d3a	137
aa21c004	138	if (priv->monitormode != LBS_MONITOR_OFF) {
965f8bbc LCC	139	skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
	140	} else {
	141	if (priv->mesh_dev && IS_MESH_FRAME(skb))
	142	skb->protocol = eth_type_trans(skb, priv->mesh_dev);
	143	else
	144	skb->protocol = eth_type_trans(skb, priv->dev);
	145	}
90885661	146	skb->ip_summed = CHECKSUM_NONE;
876c9d3a	147	netif_rx(skb);
876c9d3a MT	148	}
	149
	150	/**
	151	* @brief This function processes received packet and forwards it
	152	* to kernel/upper layer
	153	*
69f9032d	154	* @param priv A pointer to struct lbs_private
876c9d3a MT	155	* @param skb A pointer to skb which includes the received packet
	156	* @return 0 or -1
	157	*/
69f9032d	158	int lbs_process_rxed_packet(struct lbs_private priv, struct sk_buff skb)
876c9d3a	159	{
876c9d3a MT	160	int ret = 0;
	161
	162	struct rxpackethdr *p_rx_pkt;
	163	struct rxpd *p_rx_pd;
	164
	165	int hdrchop;
	166	struct ethhdr *p_ethhdr;
	167
	168	const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	169
9012b28a	170	lbs_deb_enter(LBS_DEB_RX);
876c9d3a	171
aa21c004	172	if (priv->monitormode != LBS_MONITOR_OFF)
876c9d3a MT	173	return process_rxed_802_11_packet(priv, skb);
	174
	175	p_rx_pkt = (struct rxpackethdr *) skb->data;
	176	p_rx_pd = &p_rx_pkt->rx_pd;
	177	if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
	178	SET_MESH_FRAME(skb);
	179	else
	180	UNSET_MESH_FRAME(skb);
	181
ece56191	182	lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
876c9d3a MT	183	min_t(unsigned int, skb->len, 100));
	184
	185	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	186	lbs_deb_rx("rx err: frame received with bad length\n");
876c9d3a MT	187	priv->stats.rx_length_errors++;
	188	ret = 0;
	189	goto done;
	190	}
	191
	192	/*
	193	* Check rxpd status and update 802.3 stat,
	194	*/
981f187b	195	if (!(p_rx_pd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
9012b28a HS	196	lbs_deb_rx("rx err: frame received with bad status\n");
9012b28a HS	197	lbs_pr_alert("rxpd not ok\n");
876c9d3a MT	198	priv->stats.rx_errors++;
	199	ret = 0;
	200	goto done;
	201	}
	202
9012b28a	203	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	204	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
876c9d3a MT	205
ece56191	206	lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
876c9d3a	207	sizeof(p_rx_pkt->eth803_hdr.dest_addr));
ece56191	208	lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
876c9d3a MT	209	sizeof(p_rx_pkt->eth803_hdr.src_addr));
	210
	211	if (memcmp(&p_rx_pkt->rfc1042_hdr,
	212	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
	213	/*
	214	* Replace the 803 header and rfc1042 header (llc/snap) with an
	215	* EthernetII header, keep the src/dst and snap_type (ethertype)
	216	*
	217	* The firmware only passes up SNAP frames converting
	218	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	219	*
	220	* To create the Ethernet II, just move the src, dst address right
	221	* before the snap_type.
	222	*/
	223	p_ethhdr = (struct ethhdr *)
	224	((u8 *) & p_rx_pkt->eth803_hdr
	225	+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
	226	- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
	227	- sizeof(p_rx_pkt->eth803_hdr.src_addr)
	228	- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
	229
	230	memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
	231	sizeof(p_ethhdr->h_source));
	232	memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
	233	sizeof(p_ethhdr->h_dest));
	234
	235	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
	236	* that was removed
	237	*/
	238	hdrchop = (u8 ) p_ethhdr - (u8 ) p_rx_pkt;
	239	} else {
ece56191	240	lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
876c9d3a MT	241	(u8 *) & p_rx_pkt->rfc1042_hdr,
	242	sizeof(p_rx_pkt->rfc1042_hdr));
	243
	244	/* Chop off the rxpd */
	245	hdrchop = (u8 ) & p_rx_pkt->eth803_hdr - (u8 ) p_rx_pkt;
	246	}
	247
	248	/* Chop off the leading header bytes so the skb points to the start of
	249	* either the reconstructed EthII frame or the 802.2/llc/snap frame
	250	*/
	251	skb_pull(skb, hdrchop);
	252
	253	/* Take the data rate from the rxpd structure
	254	* only if the rate is auto
	255	*/
aa21c004 DW	256	if (priv->auto_rate)
aa21c004 DW	257	priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
876c9d3a	258
10078321	259	lbs_compute_rssi(priv, p_rx_pd);
876c9d3a	260
9012b28a	261	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
876c9d3a MT	262	priv->stats.rx_bytes += skb->len;
	263	priv->stats.rx_packets++;
	264
10078321	265	lbs_upload_rx_packet(priv, skb);
3d4bd24b	266
876c9d3a MT	267	ret = 0;
876c9d3a MT	268	done:
9012b28a	269	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
876c9d3a MT	270	return ret;
876c9d3a MT	271	}
10078321	272	EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
876c9d3a MT	273
	274	/**
	275	* @brief This function converts Tx/Rx rates from the Marvell WLAN format
	276	* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
	277	*
	278	* @param rate Input rate
	279	* @return Output Rate (0 if invalid)
	280	*/
	281	static u8 convert_mv_rate_to_radiotap(u8 rate)
	282	{
	283	switch (rate) {
	284	case 0: /* 1 Mbps */
	285	return 2;
	286	case 1: /* 2 Mbps */
	287	return 4;
	288	case 2: /* 5.5 Mbps */
	289	return 11;
	290	case 3: /* 11 Mbps */
	291	return 22;
965f8bbc LCC	292	/* case 4: reserved */
965f8bbc LCC	293	case 5: /* 6 Mbps */
876c9d3a	294	return 12;
965f8bbc	295	case 6: /* 9 Mbps */
876c9d3a	296	return 18;
965f8bbc	297	case 7: /* 12 Mbps */
876c9d3a	298	return 24;
965f8bbc	299	case 8: /* 18 Mbps */
876c9d3a	300	return 36;
965f8bbc	301	case 9: /* 24 Mbps */
876c9d3a	302	return 48;
965f8bbc	303	case 10: /* 36 Mbps */
876c9d3a	304	return 72;
965f8bbc	305	case 11: /* 48 Mbps */
876c9d3a	306	return 96;
965f8bbc	307	case 12: /* 54 Mbps */
876c9d3a MT	308	return 108;
876c9d3a MT	309	}
9012b28a	310	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
876c9d3a MT	311	return 0;
	312	}
	313
	314	/**
	315	* @brief This function processes a received 802.11 packet and forwards it
	316	* to kernel/upper layer
	317	*
69f9032d	318	* @param priv A pointer to struct lbs_private
876c9d3a MT	319	* @param skb A pointer to skb which includes the received packet
	320	* @return 0 or -1
	321	*/
69f9032d HS	322	static int process_rxed_802_11_packet(struct lbs_private *priv,
69f9032d HS	323	struct sk_buff *skb)
876c9d3a	324	{
876c9d3a MT	325	int ret = 0;
	326
	327	struct rx80211packethdr *p_rx_pkt;
	328	struct rxpd *prxpd;
	329	struct rx_radiotap_hdr radiotap_hdr;
	330	struct rx_radiotap_hdr *pradiotap_hdr;
	331
9012b28a	332	lbs_deb_enter(LBS_DEB_RX);
876c9d3a MT	333
	334	p_rx_pkt = (struct rx80211packethdr *) skb->data;
	335	prxpd = &p_rx_pkt->rx_pd;
	336
ece56191	337	// lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
876c9d3a MT	338
876c9d3a MT	339	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	340	lbs_deb_rx("rx err: frame received wit bad length\n");
876c9d3a MT	341	priv->stats.rx_length_errors++;
	342	ret = 0;
	343	goto done;
	344	}
	345
	346	/*
	347	* Check rxpd status and update 802.3 stat,
	348	*/
981f187b	349	if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
9012b28a	350	//lbs_deb_rx("rx err: frame received with bad status\n");
876c9d3a MT	351	priv->stats.rx_errors++;
	352	}
	353
9012b28a	354	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	355	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
	356
	357	/* create the exported radio header */
876c9d3a	358
180be755 DW	359	/* radiotap header */
	360	radiotap_hdr.hdr.it_version = 0;
	361	/* XXX must check this value for pad */
	362	radiotap_hdr.hdr.it_pad = 0;
	363	radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
	364	radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
	365	/* unknown values */
	366	radiotap_hdr.flags = 0;
	367	radiotap_hdr.chan_freq = 0;
	368	radiotap_hdr.chan_flags = 0;
	369	radiotap_hdr.antenna = 0;
	370	/* known values */
	371	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	372	/* XXX must check no carryout */
	373	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
	374	radiotap_hdr.rx_flags = 0;
	375	if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
	376	radiotap_hdr.rx_flags \|= IEEE80211_RADIOTAP_F_RX_BADFCS;
	377	//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);
	378
	379	/* chop the rxpd */
	380	skb_pull(skb, sizeof(struct rxpd));
	381
	382	/* add space for the new radio header */
	383	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
	384	pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0,
	385	GFP_ATOMIC)) {
	386	lbs_pr_alert("%s: couldn't pskb_expand_head\n",
	387	__func__);
876c9d3a MT	388	}
876c9d3a MT	389
180be755 DW	390	pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
	391	memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
	392
876c9d3a MT	393	/* Take the data rate from the rxpd structure
	394	* only if the rate is auto
	395	*/
aa21c004 DW	396	if (priv->auto_rate)
aa21c004 DW	397	priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
876c9d3a	398
10078321	399	lbs_compute_rssi(priv, prxpd);
876c9d3a	400
9012b28a	401	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
876c9d3a MT	402	priv->stats.rx_bytes += skb->len;
	403	priv->stats.rx_packets++;
	404
10078321	405	lbs_upload_rx_packet(priv, skb);
3d4bd24b	406
876c9d3a	407	ret = 0;
876c9d3a	408
9012b28a	409	done:
9012b28a HS	410	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
9012b28a HS	411	return ret;
876c9d3a	412	}