[deliverable/linux.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 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));
	if (priv->mesh_dev) {
		if (priv->mesh_fw_ver == MESH_FW_OLD) {
			if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
				dev = priv->mesh_dev;
		} else if (priv->mesh_fw_ver == MESH_FW_NEW) {
			if (p_rx_pd->u.bss.bss_num == MESH_IFACE_ID)
				dev = priv->mesh_dev;
		}
	}

	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>
	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 {
876c9d3a MT	28	struct eth803hdr eth803_hdr;
	29	struct rfc1042hdr rfc1042_hdr;
	30	} __attribute__ ((packed));
	31
	32	struct rx80211packethdr {
	33	struct rxpd rx_pd;
	34	void *eth80211_hdr;
	35	} __attribute__ ((packed));
	36
69f9032d HS	37	static int process_rxed_802_11_packet(struct lbs_private *priv,
69f9032d HS	38	struct sk_buff *skb);
876c9d3a MT	39
	40	/**
	41	* @brief This function computes the avgSNR .
	42	*
69f9032d	43	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	44	* @return avgSNR
876c9d3a MT	45	*/
69f9032d	46	static u8 lbs_getavgsnr(struct lbs_private *priv)
876c9d3a MT	47	{
	48	u8 i;
	49	u16 temp = 0;
aa21c004	50	if (priv->numSNRNF == 0)
876c9d3a	51	return 0;
aa21c004 DW	52	for (i = 0; i < priv->numSNRNF; i++)
	53	temp += priv->rawSNR[i];
	54	return (u8) (temp / priv->numSNRNF);
876c9d3a MT	55
	56	}
	57
	58	/**
	59	* @brief This function computes the AvgNF
	60	*
69f9032d	61	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	62	* @return AvgNF
876c9d3a MT	63	*/
69f9032d	64	static u8 lbs_getavgnf(struct lbs_private *priv)
876c9d3a MT	65	{
	66	u8 i;
	67	u16 temp = 0;
aa21c004	68	if (priv->numSNRNF == 0)
876c9d3a	69	return 0;
aa21c004 DW	70	for (i = 0; i < priv->numSNRNF; i++)
	71	temp += priv->rawNF[i];
	72	return (u8) (temp / priv->numSNRNF);
876c9d3a MT	73
	74	}
	75
	76	/**
	77	* @brief This function save the raw SNR/NF to our internel buffer
	78	*
69f9032d	79	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	80	* @param prxpd A pointer to rxpd structure of received packet
	81	* @return n/a
	82	*/
69f9032d	83	static void lbs_save_rawSNRNF(struct lbs_private priv, struct rxpd p_rx_pd)
876c9d3a	84	{
aa21c004 DW	85	if (priv->numSNRNF < DEFAULT_DATA_AVG_FACTOR)
	86	priv->numSNRNF++;
	87	priv->rawSNR[priv->nextSNRNF] = p_rx_pd->snr;
	88	priv->rawNF[priv->nextSNRNF] = p_rx_pd->nf;
	89	priv->nextSNRNF++;
	90	if (priv->nextSNRNF >= DEFAULT_DATA_AVG_FACTOR)
	91	priv->nextSNRNF = 0;
876c9d3a MT	92	return;
	93	}
	94
	95	/**
	96	* @brief This function computes the RSSI in received packet.
	97	*
69f9032d	98	* @param priv A pointer to struct lbs_private structure
876c9d3a MT	99	* @param prxpd A pointer to rxpd structure of received packet
	100	* @return n/a
	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	*
69f9032d	137	* @param priv A pointer to struct lbs_private
876c9d3a MT	138	* @param skb A pointer to skb which includes the received packet
	139	* @return 0 or -1
	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));
684d6b36 BZ	163	if (priv->mesh_dev) {
	164	if (priv->mesh_fw_ver == MESH_FW_OLD) {
	165	if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
	166	dev = priv->mesh_dev;
	167	} else if (priv->mesh_fw_ver == MESH_FW_NEW) {
	168	if (p_rx_pd->u.bss.bss_num == MESH_IFACE_ID)
	169	dev = priv->mesh_dev;
	170	}
	171	}
876c9d3a	172
ece56191	173	lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
876c9d3a MT	174	min_t(unsigned int, skb->len, 100));
	175
	176	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	177	lbs_deb_rx("rx err: frame received with bad length\n");
bbfc6b78	178	dev->stats.rx_length_errors++;
876c9d3a	179	ret = 0;
f54930f3	180	dev_kfree_skb(skb);
876c9d3a MT	181	goto done;
	182	}
	183
e45d8e53	184	lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
a2caba6b JL	185	skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
a2caba6b JL	186	skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
876c9d3a	187
ece56191	188	lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
876c9d3a	189	sizeof(p_rx_pkt->eth803_hdr.dest_addr));
ece56191	190	lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
876c9d3a MT	191	sizeof(p_rx_pkt->eth803_hdr.src_addr));
	192
	193	if (memcmp(&p_rx_pkt->rfc1042_hdr,
	194	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
	195	/*
	196	* Replace the 803 header and rfc1042 header (llc/snap) with an
	197	* EthernetII header, keep the src/dst and snap_type (ethertype)
	198	*
	199	* The firmware only passes up SNAP frames converting
	200	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	201	*
	202	* To create the Ethernet II, just move the src, dst address right
	203	* before the snap_type.
	204	*/
	205	p_ethhdr = (struct ethhdr *)
	206	((u8 *) & p_rx_pkt->eth803_hdr
	207	+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
	208	- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
	209	- sizeof(p_rx_pkt->eth803_hdr.src_addr)
	210	- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
	211
	212	memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
	213	sizeof(p_ethhdr->h_source));
	214	memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
	215	sizeof(p_ethhdr->h_dest));
	216
	217	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
	218	* that was removed
	219	*/
e45d8e53	220	hdrchop = (u8 )p_ethhdr - (u8 )p_rx_pd;
876c9d3a	221	} else {
ece56191	222	lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
876c9d3a MT	223	(u8 *) & p_rx_pkt->rfc1042_hdr,
	224	sizeof(p_rx_pkt->rfc1042_hdr));
	225
	226	/* Chop off the rxpd */
e45d8e53	227	hdrchop = (u8 )&p_rx_pkt->eth803_hdr - (u8 )p_rx_pd;
876c9d3a MT	228	}
	229
	230	/* Chop off the leading header bytes so the skb points to the start of
	231	* either the reconstructed EthII frame or the 802.2/llc/snap frame
	232	*/
	233	skb_pull(skb, hdrchop);
	234
	235	/* Take the data rate from the rxpd structure
	236	* only if the rate is auto
	237	*/
85319f93	238	if (priv->enablehwauto)
aa21c004	239	priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
876c9d3a	240
10078321	241	lbs_compute_rssi(priv, p_rx_pd);
876c9d3a	242
9012b28a	243	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
bbfc6b78 SH	244	dev->stats.rx_bytes += skb->len;
bbfc6b78 SH	245	dev->stats.rx_packets++;
876c9d3a	246
6f93a8e7	247	skb->protocol = eth_type_trans(skb, dev);
ae3e0fcf HS	248	if (in_interrupt())
	249	netif_rx(skb);
	250	else
	251	netif_rx_ni(skb);
3d4bd24b	252
876c9d3a MT	253	ret = 0;
876c9d3a MT	254	done:
9012b28a	255	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
876c9d3a MT	256	return ret;
876c9d3a MT	257	}
10078321	258	EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
876c9d3a MT	259
	260	/**
	261	* @brief This function converts Tx/Rx rates from the Marvell WLAN format
	262	* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
	263	*
	264	* @param rate Input rate
	265	* @return Output Rate (0 if invalid)
	266	*/
	267	static u8 convert_mv_rate_to_radiotap(u8 rate)
	268	{
	269	switch (rate) {
	270	case 0: /* 1 Mbps */
	271	return 2;
	272	case 1: /* 2 Mbps */
	273	return 4;
	274	case 2: /* 5.5 Mbps */
	275	return 11;
	276	case 3: /* 11 Mbps */
	277	return 22;
965f8bbc LCC	278	/* case 4: reserved */
965f8bbc LCC	279	case 5: /* 6 Mbps */
876c9d3a	280	return 12;
965f8bbc	281	case 6: /* 9 Mbps */
876c9d3a	282	return 18;
965f8bbc	283	case 7: /* 12 Mbps */
876c9d3a	284	return 24;
965f8bbc	285	case 8: /* 18 Mbps */
876c9d3a	286	return 36;
965f8bbc	287	case 9: /* 24 Mbps */
876c9d3a	288	return 48;
965f8bbc	289	case 10: /* 36 Mbps */
876c9d3a	290	return 72;
965f8bbc	291	case 11: /* 48 Mbps */
876c9d3a	292	return 96;
965f8bbc	293	case 12: /* 54 Mbps */
876c9d3a MT	294	return 108;
876c9d3a MT	295	}
9012b28a	296	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
876c9d3a MT	297	return 0;
	298	}
	299
	300	/**
	301	* @brief This function processes a received 802.11 packet and forwards it
	302	* to kernel/upper layer
	303	*
69f9032d	304	* @param priv A pointer to struct lbs_private
876c9d3a MT	305	* @param skb A pointer to skb which includes the received packet
	306	* @return 0 or -1
	307	*/
69f9032d HS	308	static int process_rxed_802_11_packet(struct lbs_private *priv,
69f9032d HS	309	struct sk_buff *skb)
876c9d3a	310	{
876c9d3a	311	int ret = 0;
bbfc6b78	312	struct net_device *dev = priv->dev;
876c9d3a MT	313	struct rx80211packethdr *p_rx_pkt;
	314	struct rxpd *prxpd;
	315	struct rx_radiotap_hdr radiotap_hdr;
	316	struct rx_radiotap_hdr *pradiotap_hdr;
	317
9012b28a	318	lbs_deb_enter(LBS_DEB_RX);
876c9d3a MT	319
	320	p_rx_pkt = (struct rx80211packethdr *) skb->data;
	321	prxpd = &p_rx_pkt->rx_pd;
	322
ece56191	323	// lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
876c9d3a MT	324
876c9d3a MT	325	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
7bf02c29	326	lbs_deb_rx("rx err: frame received with bad length\n");
bbfc6b78	327	dev->stats.rx_length_errors++;
7bf02c29	328	ret = -EINVAL;
b700a98c	329	kfree_skb(skb);
876c9d3a MT	330	goto done;
	331	}
	332
9012b28a	333	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	334	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
	335
	336	/* create the exported radio header */
876c9d3a	337
180be755 DW	338	/* radiotap header */
	339	radiotap_hdr.hdr.it_version = 0;
	340	/* XXX must check this value for pad */
	341	radiotap_hdr.hdr.it_pad = 0;
	342	radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
	343	radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
180be755 DW	344	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	345	/* XXX must check no carryout */
	346	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
180be755 DW	347
	348	/* chop the rxpd */
	349	skb_pull(skb, sizeof(struct rxpd));
	350
	351	/* add space for the new radio header */
	352	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
7bf02c29 DW	353	pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
	354	lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__);
	355	ret = -ENOMEM;
	356	kfree_skb(skb);
	357	goto done;
876c9d3a MT	358	}
876c9d3a MT	359
180be755 DW	360	pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
	361	memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
	362
876c9d3a MT	363	/* Take the data rate from the rxpd structure
	364	* only if the rate is auto
	365	*/
85319f93	366	if (priv->enablehwauto)
aa21c004	367	priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
876c9d3a	368
10078321	369	lbs_compute_rssi(priv, prxpd);
876c9d3a	370
9012b28a	371	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
bbfc6b78 SH	372	dev->stats.rx_bytes += skb->len;
bbfc6b78 SH	373	dev->stats.rx_packets++;
876c9d3a	374
6f93a8e7 DW	375	skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
6f93a8e7 DW	376	netif_rx(skb);
3d4bd24b	377
876c9d3a	378	ret = 0;
876c9d3a	379
9012b28a	380	done:
9012b28a HS	381	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
9012b28a HS	382	return ret;
876c9d3a	383	}