[net-next-2.6.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;
}

/**
 *  @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 */
	memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
	/* XXX must check radiotap_hdr.hdr.it_pad for pad */
	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
876c9d3a MT	41	/**
819cf15e	42	* @brief This function computes the avgSNR .
876c9d3a	43	*
819cf15e SM	44	* @param priv A pointer to struct lbs_private structure
819cf15e SM	45	* @return avgSNR
876c9d3a	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	/**
819cf15e	60	* @brief This function computes the AvgNF
876c9d3a	61	*
819cf15e SM	62	* @param priv A pointer to struct lbs_private structure
819cf15e SM	63	* @return AvgNF
876c9d3a	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	/**
819cf15e	78	* @brief This function save the raw SNR/NF to our internel buffer
876c9d3a	79	*
819cf15e SM	80	* @param priv A pointer to struct lbs_private structure
	81	* @param prxpd A pointer to rxpd structure of received packet
	82	* @return n/a
876c9d3a	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	}
	94
	95	/**
819cf15e	96	* @brief This function computes the RSSI in received packet.
876c9d3a	97	*
819cf15e SM	98	* @param priv A pointer to struct lbs_private structure
	99	* @param prxpd A pointer to rxpd structure of received packet
	100	* @return n/a
876c9d3a	101	*/
69f9032d	102	static void lbs_compute_rssi(struct lbs_private priv, struct rxpd p_rx_pd)
876c9d3a	103	{
876c9d3a	104
9012b28a	105	lbs_deb_enter(LBS_DEB_RX);
876c9d3a	106
9012b28a HS	107	lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf);
9012b28a HS	108	lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n",
aa21c004 DW	109	priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
aa21c004 DW	110	priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
876c9d3a	111
aa21c004 DW	112	priv->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
aa21c004 DW	113	priv->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
10078321	114	lbs_save_rawSNRNF(priv, p_rx_pd);
876c9d3a	115
aa21c004 DW	116	priv->SNR[TYPE_RXPD][TYPE_AVG] = lbs_getavgsnr(priv) * AVG_SCALE;
aa21c004 DW	117	priv->NF[TYPE_RXPD][TYPE_AVG] = lbs_getavgnf(priv) * AVG_SCALE;
9012b28a	118	lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
aa21c004 DW	119	priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
aa21c004 DW	120	priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
876c9d3a	121
aa21c004 DW	122	priv->RSSI[TYPE_RXPD][TYPE_NOAVG] =
	123	CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_NOAVG],
	124	priv->NF[TYPE_RXPD][TYPE_NOAVG]);
876c9d3a	125
aa21c004 DW	126	priv->RSSI[TYPE_RXPD][TYPE_AVG] =
	127	CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	128	priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
876c9d3a	129
9012b28a	130	lbs_deb_leave(LBS_DEB_RX);
876c9d3a MT	131	}
876c9d3a MT	132
876c9d3a MT	133	/**
	134	* @brief This function processes received packet and forwards it
	135	* to kernel/upper layer
	136	*
819cf15e SM	137	* @param priv A pointer to struct lbs_private
	138	* @param skb A pointer to skb which includes the received packet
	139	* @return 0 or -1
876c9d3a	140	*/
69f9032d	141	int lbs_process_rxed_packet(struct lbs_private priv, struct sk_buff skb)
876c9d3a	142	{
876c9d3a	143	int ret = 0;
6f93a8e7	144	struct net_device *dev = priv->dev;
876c9d3a MT	145	struct rxpackethdr *p_rx_pkt;
876c9d3a MT	146	struct rxpd *p_rx_pd;
876c9d3a MT	147	int hdrchop;
876c9d3a MT	148	struct ethhdr *p_ethhdr;
876c9d3a MT	149	const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
876c9d3a MT	150
9012b28a	151	lbs_deb_enter(LBS_DEB_RX);
876c9d3a	152
7919b89c HS	153	BUG_ON(!skb);
7919b89c HS	154
6f93a8e7 DW	155	skb->ip_summed = CHECKSUM_NONE;
6f93a8e7 DW	156
c2b310a7	157	if (priv->monitormode)
876c9d3a MT	158	return process_rxed_802_11_packet(priv, skb);
876c9d3a MT	159
e45d8e53 BZ	160	p_rx_pd = (struct rxpd *) skb->data;
	161	p_rx_pkt = (struct rxpackethdr ) ((u8 )p_rx_pd +
	162	le32_to_cpu(p_rx_pd->pkt_ptr));
e0e42da3 HS	163
e0e42da3 HS	164	dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
876c9d3a	165
ece56191	166	lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
876c9d3a MT	167	min_t(unsigned int, skb->len, 100));
	168
	169	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	170	lbs_deb_rx("rx err: frame received with bad length\n");
bbfc6b78	171	dev->stats.rx_length_errors++;
876c9d3a	172	ret = 0;
f54930f3	173	dev_kfree_skb(skb);
876c9d3a MT	174	goto done;
	175	}
	176
e45d8e53	177	lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
a2caba6b JL	178	skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
a2caba6b JL	179	skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
876c9d3a	180
ece56191	181	lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
876c9d3a	182	sizeof(p_rx_pkt->eth803_hdr.dest_addr));
ece56191	183	lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
876c9d3a MT	184	sizeof(p_rx_pkt->eth803_hdr.src_addr));
	185
	186	if (memcmp(&p_rx_pkt->rfc1042_hdr,
	187	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
	188	/*
	189	* Replace the 803 header and rfc1042 header (llc/snap) with an
	190	* EthernetII header, keep the src/dst and snap_type (ethertype)
	191	*
	192	* The firmware only passes up SNAP frames converting
	193	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	194	*
	195	* To create the Ethernet II, just move the src, dst address right
	196	* before the snap_type.
	197	*/
	198	p_ethhdr = (struct ethhdr *)
819cf15e	199	((u8 *) &p_rx_pkt->eth803_hdr
876c9d3a MT	200	+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
	201	- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
	202	- sizeof(p_rx_pkt->eth803_hdr.src_addr)
	203	- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
	204
	205	memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
	206	sizeof(p_ethhdr->h_source));
	207	memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
	208	sizeof(p_ethhdr->h_dest));
	209
	210	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
	211	* that was removed
	212	*/
e45d8e53	213	hdrchop = (u8 )p_ethhdr - (u8 )p_rx_pd;
876c9d3a	214	} else {
ece56191	215	lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
819cf15e	216	(u8 *) &p_rx_pkt->rfc1042_hdr,
876c9d3a MT	217	sizeof(p_rx_pkt->rfc1042_hdr));
	218
	219	/* Chop off the rxpd */
e45d8e53	220	hdrchop = (u8 )&p_rx_pkt->eth803_hdr - (u8 )p_rx_pd;
876c9d3a MT	221	}
	222
	223	/* Chop off the leading header bytes so the skb points to the start of
	224	* either the reconstructed EthII frame or the 802.2/llc/snap frame
	225	*/
	226	skb_pull(skb, hdrchop);
	227
	228	/* Take the data rate from the rxpd structure
	229	* only if the rate is auto
	230	*/
85319f93	231	if (priv->enablehwauto)
aa21c004	232	priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
876c9d3a	233
10078321	234	lbs_compute_rssi(priv, p_rx_pd);
876c9d3a	235
9012b28a	236	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
bbfc6b78 SH	237	dev->stats.rx_bytes += skb->len;
bbfc6b78 SH	238	dev->stats.rx_packets++;
876c9d3a	239
6f93a8e7	240	skb->protocol = eth_type_trans(skb, dev);
ae3e0fcf HS	241	if (in_interrupt())
	242	netif_rx(skb);
	243	else
	244	netif_rx_ni(skb);
3d4bd24b	245
876c9d3a MT	246	ret = 0;
876c9d3a MT	247	done:
9012b28a	248	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
876c9d3a MT	249	return ret;
876c9d3a MT	250	}
10078321	251	EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
876c9d3a MT	252
	253	/**
	254	* @brief This function converts Tx/Rx rates from the Marvell WLAN format
	255	* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
	256	*
819cf15e SM	257	* @param rate Input rate
819cf15e SM	258	* @return Output Rate (0 if invalid)
876c9d3a MT	259	*/
	260	static u8 convert_mv_rate_to_radiotap(u8 rate)
	261	{
	262	switch (rate) {
	263	case 0: /* 1 Mbps */
	264	return 2;
	265	case 1: /* 2 Mbps */
	266	return 4;
	267	case 2: /* 5.5 Mbps */
	268	return 11;
	269	case 3: /* 11 Mbps */
	270	return 22;
965f8bbc LCC	271	/* case 4: reserved */
965f8bbc LCC	272	case 5: /* 6 Mbps */
876c9d3a	273	return 12;
965f8bbc	274	case 6: /* 9 Mbps */
876c9d3a	275	return 18;
965f8bbc	276	case 7: /* 12 Mbps */
876c9d3a	277	return 24;
965f8bbc	278	case 8: /* 18 Mbps */
876c9d3a	279	return 36;
965f8bbc	280	case 9: /* 24 Mbps */
876c9d3a	281	return 48;
965f8bbc	282	case 10: /* 36 Mbps */
876c9d3a	283	return 72;
965f8bbc	284	case 11: /* 48 Mbps */
876c9d3a	285	return 96;
965f8bbc	286	case 12: /* 54 Mbps */
876c9d3a MT	287	return 108;
876c9d3a MT	288	}
9012b28a	289	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
876c9d3a MT	290	return 0;
	291	}
	292
	293	/**
	294	* @brief This function processes a received 802.11 packet and forwards it
	295	* to kernel/upper layer
	296	*
819cf15e SM	297	* @param priv A pointer to struct lbs_private
	298	* @param skb A pointer to skb which includes the received packet
	299	* @return 0 or -1
876c9d3a	300	*/
69f9032d HS	301	static int process_rxed_802_11_packet(struct lbs_private *priv,
69f9032d HS	302	struct sk_buff *skb)
876c9d3a	303	{
876c9d3a	304	int ret = 0;
bbfc6b78	305	struct net_device *dev = priv->dev;
876c9d3a MT	306	struct rx80211packethdr *p_rx_pkt;
	307	struct rxpd *prxpd;
	308	struct rx_radiotap_hdr radiotap_hdr;
	309	struct rx_radiotap_hdr *pradiotap_hdr;
	310
9012b28a	311	lbs_deb_enter(LBS_DEB_RX);
876c9d3a MT	312
	313	p_rx_pkt = (struct rx80211packethdr *) skb->data;
	314	prxpd = &p_rx_pkt->rx_pd;
	315
819cf15e	316	/* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */
876c9d3a MT	317
876c9d3a MT	318	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
7bf02c29	319	lbs_deb_rx("rx err: frame received with bad length\n");
bbfc6b78	320	dev->stats.rx_length_errors++;
7bf02c29	321	ret = -EINVAL;
b700a98c	322	kfree_skb(skb);
876c9d3a MT	323	goto done;
	324	}
	325
9012b28a	326	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	327	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
	328
	329	/* create the exported radio header */
876c9d3a	330
180be755	331	/* radiotap header */
c6a6368b PB	332	memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
c6a6368b PB	333	/* XXX must check radiotap_hdr.hdr.it_pad for pad */
180be755 DW	334	radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
180be755 DW	335	radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
180be755 DW	336	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	337	/* XXX must check no carryout */
	338	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
180be755 DW	339
	340	/* chop the rxpd */
	341	skb_pull(skb, sizeof(struct rxpd));
	342
	343	/* add space for the new radio header */
	344	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
7bf02c29 DW	345	pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
	346	lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__);
	347	ret = -ENOMEM;
	348	kfree_skb(skb);
	349	goto done;
876c9d3a MT	350	}
876c9d3a MT	351
180be755 DW	352	pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
	353	memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
	354
876c9d3a MT	355	/* Take the data rate from the rxpd structure
	356	* only if the rate is auto
	357	*/
85319f93	358	if (priv->enablehwauto)
aa21c004	359	priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
876c9d3a	360
10078321	361	lbs_compute_rssi(priv, prxpd);
876c9d3a	362
9012b28a	363	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
bbfc6b78 SH	364	dev->stats.rx_bytes += skb->len;
bbfc6b78 SH	365	dev->stats.rx_packets++;
876c9d3a	366
6f93a8e7 DW	367	skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
6f93a8e7 DW	368	netif_rx(skb);
3d4bd24b	369
876c9d3a	370	ret = 0;
876c9d3a	371
9012b28a	372	done:
9012b28a HS	373	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
9012b28a HS	374	return ret;
876c9d3a	375	}