[linux-block.git] / drivers / net / wireless / libertas / rx.c

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

#include "host.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 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);
}

/**
 *  @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 net_device *dev = priv->dev;
	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);

	BUG_ON(!skb);

	skb->ip_summed = CHECKSUM_NONE;

	if (priv->monitormode)
		return process_rxed_802_11_packet(priv, skb);

	p_rx_pd = (struct rxpd *) skb->data;
	p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
		le32_to_cpu(p_rx_pd->pkt_ptr));

	dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);

	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");
		dev->stats.rx_length_errors++;
		ret = 0;
		dev_kfree_skb(skb);
		goto done;
	}

	lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
		skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
		skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));

	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_pd;
	} 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_pd;
	}

	/* 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->enablehwauto)
		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);
	dev->stats.rx_bytes += skb->len;
	dev->stats.rx_packets++;

	skb->protocol = eth_type_trans(skb, dev);
	if (in_interrupt())
		netif_rx(skb);
	else
		netif_rx_ni(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 net_device *dev = priv->dev;
	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 with bad length\n");
		dev->stats.rx_length_errors++;
		ret = -EINVAL;
		kfree_skb(skb);
		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));

	/* 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);
	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	/* XXX must check no carryout */
	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;

	/* 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__);
		ret = -ENOMEM;
		kfree_skb(skb);
		goto done;
	}

	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->enablehwauto)
		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);
	dev->stats.rx_bytes += skb->len;
	dev->stats.rx_packets++;

	skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
	netif_rx(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>
5a0e3ad6	5	#include <linux/slab.h>
876c9d3a MT	6	#include <linux/types.h>
876c9d3a MT	7
9e66e701	8	#include "host.h"
876c9d3a MT	9	#include "radiotap.h"
	10	#include "decl.h"
	11	#include "dev.h"
	12	#include "wext.h"
	13
	14	struct eth803hdr {
	15	u8 dest_addr[6];
	16	u8 src_addr[6];
	17	u16 h803_len;
	18	} __attribute__ ((packed));
	19
	20	struct rfc1042hdr {
	21	u8 llc_dsap;
	22	u8 llc_ssap;
	23	u8 llc_ctrl;
	24	u8 snap_oui[3];
	25	u16 snap_type;
	26	} __attribute__ ((packed));
	27
	28	struct rxpackethdr {
876c9d3a MT	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
876c9d3a MT	134	/**
	135	* @brief This function processes received packet and forwards it
	136	* to kernel/upper layer
	137	*
69f9032d	138	* @param priv A pointer to struct lbs_private
876c9d3a MT	139	* @param skb A pointer to skb which includes the received packet
	140	* @return 0 or -1
	141	*/
69f9032d	142	int lbs_process_rxed_packet(struct lbs_private priv, struct sk_buff skb)
876c9d3a	143	{
876c9d3a	144	int ret = 0;
6f93a8e7	145	struct net_device *dev = priv->dev;
876c9d3a MT	146	struct rxpackethdr *p_rx_pkt;
876c9d3a MT	147	struct rxpd *p_rx_pd;
876c9d3a MT	148	int hdrchop;
876c9d3a MT	149	struct ethhdr *p_ethhdr;
876c9d3a MT	150	const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
876c9d3a MT	151
9012b28a	152	lbs_deb_enter(LBS_DEB_RX);
876c9d3a	153
7919b89c HS	154	BUG_ON(!skb);
7919b89c HS	155
6f93a8e7 DW	156	skb->ip_summed = CHECKSUM_NONE;
6f93a8e7 DW	157
c2b310a7	158	if (priv->monitormode)
876c9d3a MT	159	return process_rxed_802_11_packet(priv, skb);
876c9d3a MT	160
e45d8e53 BZ	161	p_rx_pd = (struct rxpd *) skb->data;
	162	p_rx_pkt = (struct rxpackethdr ) ((u8 )p_rx_pd +
	163	le32_to_cpu(p_rx_pd->pkt_ptr));
e0e42da3 HS	164
e0e42da3 HS	165	dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
876c9d3a	166
ece56191	167	lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
876c9d3a MT	168	min_t(unsigned int, skb->len, 100));
	169
	170	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	171	lbs_deb_rx("rx err: frame received with bad length\n");
bbfc6b78	172	dev->stats.rx_length_errors++;
876c9d3a	173	ret = 0;
f54930f3	174	dev_kfree_skb(skb);
876c9d3a MT	175	goto done;
	176	}
	177
e45d8e53	178	lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
a2caba6b JL	179	skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
a2caba6b JL	180	skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
876c9d3a	181
ece56191	182	lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
876c9d3a	183	sizeof(p_rx_pkt->eth803_hdr.dest_addr));
ece56191	184	lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
876c9d3a MT	185	sizeof(p_rx_pkt->eth803_hdr.src_addr));
	186
	187	if (memcmp(&p_rx_pkt->rfc1042_hdr,
	188	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
	189	/*
	190	* Replace the 803 header and rfc1042 header (llc/snap) with an
	191	* EthernetII header, keep the src/dst and snap_type (ethertype)
	192	*
	193	* The firmware only passes up SNAP frames converting
	194	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	195	*
	196	* To create the Ethernet II, just move the src, dst address right
	197	* before the snap_type.
	198	*/
	199	p_ethhdr = (struct ethhdr *)
	200	((u8 *) & p_rx_pkt->eth803_hdr
	201	+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
	202	- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
	203	- sizeof(p_rx_pkt->eth803_hdr.src_addr)
	204	- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
	205
	206	memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
	207	sizeof(p_ethhdr->h_source));
	208	memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
	209	sizeof(p_ethhdr->h_dest));
	210
	211	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
	212	* that was removed
	213	*/
e45d8e53	214	hdrchop = (u8 )p_ethhdr - (u8 )p_rx_pd;
876c9d3a	215	} else {
ece56191	216	lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
876c9d3a MT	217	(u8 *) & p_rx_pkt->rfc1042_hdr,
	218	sizeof(p_rx_pkt->rfc1042_hdr));
	219
	220	/* Chop off the rxpd */
e45d8e53	221	hdrchop = (u8 )&p_rx_pkt->eth803_hdr - (u8 )p_rx_pd;
876c9d3a MT	222	}
	223
	224	/* Chop off the leading header bytes so the skb points to the start of
	225	* either the reconstructed EthII frame or the 802.2/llc/snap frame
	226	*/
	227	skb_pull(skb, hdrchop);
	228
	229	/* Take the data rate from the rxpd structure
	230	* only if the rate is auto
	231	*/
85319f93	232	if (priv->enablehwauto)
aa21c004	233	priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
876c9d3a	234
10078321	235	lbs_compute_rssi(priv, p_rx_pd);
876c9d3a	236
9012b28a	237	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
bbfc6b78 SH	238	dev->stats.rx_bytes += skb->len;
bbfc6b78 SH	239	dev->stats.rx_packets++;
876c9d3a	240
6f93a8e7	241	skb->protocol = eth_type_trans(skb, dev);
ae3e0fcf HS	242	if (in_interrupt())
	243	netif_rx(skb);
	244	else
	245	netif_rx_ni(skb);
3d4bd24b	246
876c9d3a MT	247	ret = 0;
876c9d3a MT	248	done:
9012b28a	249	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
876c9d3a MT	250	return ret;
876c9d3a MT	251	}
10078321	252	EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
876c9d3a MT	253
	254	/**
	255	* @brief This function converts Tx/Rx rates from the Marvell WLAN format
	256	* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
	257	*
	258	* @param rate Input rate
	259	* @return Output Rate (0 if invalid)
	260	*/
	261	static u8 convert_mv_rate_to_radiotap(u8 rate)
	262	{
	263	switch (rate) {
	264	case 0: /* 1 Mbps */
	265	return 2;
	266	case 1: /* 2 Mbps */
	267	return 4;
	268	case 2: /* 5.5 Mbps */
	269	return 11;
	270	case 3: /* 11 Mbps */
	271	return 22;
965f8bbc LCC	272	/* case 4: reserved */
965f8bbc LCC	273	case 5: /* 6 Mbps */
876c9d3a	274	return 12;
965f8bbc	275	case 6: /* 9 Mbps */
876c9d3a	276	return 18;
965f8bbc	277	case 7: /* 12 Mbps */
876c9d3a	278	return 24;
965f8bbc	279	case 8: /* 18 Mbps */
876c9d3a	280	return 36;
965f8bbc	281	case 9: /* 24 Mbps */
876c9d3a	282	return 48;
965f8bbc	283	case 10: /* 36 Mbps */
876c9d3a	284	return 72;
965f8bbc	285	case 11: /* 48 Mbps */
876c9d3a	286	return 96;
965f8bbc	287	case 12: /* 54 Mbps */
876c9d3a MT	288	return 108;
876c9d3a MT	289	}
9012b28a	290	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
876c9d3a MT	291	return 0;
	292	}
	293
	294	/**
	295	* @brief This function processes a received 802.11 packet and forwards it
	296	* to kernel/upper layer
	297	*
69f9032d	298	* @param priv A pointer to struct lbs_private
876c9d3a MT	299	* @param skb A pointer to skb which includes the received packet
	300	* @return 0 or -1
	301	*/
69f9032d HS	302	static int process_rxed_802_11_packet(struct lbs_private *priv,
69f9032d HS	303	struct sk_buff *skb)
876c9d3a	304	{
876c9d3a	305	int ret = 0;
bbfc6b78	306	struct net_device *dev = priv->dev;
876c9d3a MT	307	struct rx80211packethdr *p_rx_pkt;
	308	struct rxpd *prxpd;
	309	struct rx_radiotap_hdr radiotap_hdr;
	310	struct rx_radiotap_hdr *pradiotap_hdr;
	311
9012b28a	312	lbs_deb_enter(LBS_DEB_RX);
876c9d3a MT	313
	314	p_rx_pkt = (struct rx80211packethdr *) skb->data;
	315	prxpd = &p_rx_pkt->rx_pd;
	316
ece56191	317	// lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
876c9d3a MT	318
876c9d3a MT	319	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
7bf02c29	320	lbs_deb_rx("rx err: frame received with bad length\n");
bbfc6b78	321	dev->stats.rx_length_errors++;
7bf02c29	322	ret = -EINVAL;
b700a98c	323	kfree_skb(skb);
876c9d3a MT	324	goto done;
	325	}
	326
9012b28a	327	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	328	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
	329
	330	/* create the exported radio header */
876c9d3a	331
180be755 DW	332	/* radiotap header */
	333	radiotap_hdr.hdr.it_version = 0;
	334	/* XXX must check this value for pad */
	335	radiotap_hdr.hdr.it_pad = 0;
	336	radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
	337	radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
180be755 DW	338	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	339	/* XXX must check no carryout */
	340	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
180be755 DW	341
	342	/* chop the rxpd */
	343	skb_pull(skb, sizeof(struct rxpd));
	344
	345	/* add space for the new radio header */
	346	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
7bf02c29 DW	347	pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
	348	lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__);
	349	ret = -ENOMEM;
	350	kfree_skb(skb);
	351	goto done;
876c9d3a MT	352	}
876c9d3a MT	353
180be755 DW	354	pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
	355	memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
	356
876c9d3a MT	357	/* Take the data rate from the rxpd structure
	358	* only if the rate is auto
	359	*/
85319f93	360	if (priv->enablehwauto)
aa21c004	361	priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
876c9d3a	362
10078321	363	lbs_compute_rssi(priv, prxpd);
876c9d3a	364
9012b28a	365	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
bbfc6b78 SH	366	dev->stats.rx_bytes += skb->len;
bbfc6b78 SH	367	dev->stats.rx_packets++;
876c9d3a	368
6f93a8e7 DW	369	skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
6f93a8e7 DW	370	netif_rx(skb);
3d4bd24b	371
876c9d3a	372	ret = 0;
876c9d3a	373
9012b28a	374	done:
9012b28a HS	375	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
9012b28a HS	376	return ret;
876c9d3a	377	}