[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(wlan_private * priv, struct sk_buff *skb);

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

}

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

}

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

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

	lbs_deb_enter(LBS_DEB_RX);

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

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

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

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

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

	lbs_deb_leave(LBS_DEB_RX);
}

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

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

	netif_rx(skb);
}

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

	struct rxpackethdr *p_rx_pkt;
	struct rxpd *p_rx_pd;

	int hdrchop;
	struct ethhdr *p_ethhdr;

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

	lbs_deb_enter(LBS_DEB_RX);

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

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

	lbs_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 (adapter->auto_rate)
		adapter->cur_rate = libertas_fw_index_to_data_rate(p_rx_pd->rx_rate);

	wlan_compute_rssi(priv, p_rx_pd);

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

	libertas_upload_rx_packet(priv, skb);

	ret = 0;
done:
	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
	return ret;
}
EXPORT_SYMBOL_GPL(libertas_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:		/*   6 Mbps */
		return 12;
	case 5:		/*   9 Mbps */
		return 18;
	case 6:		/*  12 Mbps */
		return 24;
	case 7:		/*  18 Mbps */
		return 36;
	case 8:		/*  24 Mbps */
		return 48;
	case 9:		/*  36 Mbps */
		return 72;
	case 10:		/*  48 Mbps */
		return 96;
	case 11:		/*  54 Mbps */
		return 108;
	}
	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
	return 0;
}

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

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

	lbs_deb_enter(LBS_DEB_RX);

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

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

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

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

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

	wlan_compute_rssi(priv, prxpd);

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

	libertas_upload_rx_packet(priv, skb);

	ret = 0;

done:
	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
	38	static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb);
	39
	40	/**
	41	* @brief This function computes the avgSNR .
	42	*
	43	* @param priv A pointer to wlan_private structure
	44	* @return avgSNR
	45	*/
	46	static u8 wlan_getavgsnr(wlan_private * priv)
	47	{
	48	u8 i;
	49	u16 temp = 0;
	50	wlan_adapter *adapter = priv->adapter;
	51	if (adapter->numSNRNF == 0)
	52	return 0;
	53	for (i = 0; i < adapter->numSNRNF; i++)
	54	temp += adapter->rawSNR[i];
	55	return (u8) (temp / adapter->numSNRNF);
	56
	57	}
	58
	59	/**
	60	* @brief This function computes the AvgNF
	61	*
	62	* @param priv A pointer to wlan_private structure
	63	* @return AvgNF
	64	*/
65	static u8 wlan_getavgnf(wlan_private * priv)
66	{
67	u8 i;
68	u16 temp = 0;
69	wlan_adapter *adapter = priv->adapter;
70	if (adapter->numSNRNF == 0)
71	return 0;
72	for (i = 0; i < adapter->numSNRNF; i++)
73	temp += adapter->rawNF[i];
74	return (u8) (temp / adapter->numSNRNF);
75
76	}
77
78	/**
79	* @brief This function save the raw SNR/NF to our internel buffer
80	*
81	* @param priv A pointer to wlan_private structure
82	* @param prxpd A pointer to rxpd structure of received packet
83	* @return n/a
84	*/
85	static void wlan_save_rawSNRNF(wlan_private * priv, struct rxpd *p_rx_pd)
86	{
87	wlan_adapter *adapter = priv->adapter;
a783f1ee	88	if (adapter->numSNRNF < DEFAULT_DATA_AVG_FACTOR)
876c9d3a MT	89	adapter->numSNRNF++;
	90	adapter->rawSNR[adapter->nextSNRNF] = p_rx_pd->snr;
	91	adapter->rawNF[adapter->nextSNRNF] = p_rx_pd->nf;
	92	adapter->nextSNRNF++;
a783f1ee	93	if (adapter->nextSNRNF >= DEFAULT_DATA_AVG_FACTOR)
876c9d3a MT	94	adapter->nextSNRNF = 0;
	95	return;
	96	}
	97
	98	/**
	99	* @brief This function computes the RSSI in received packet.
	100	*
	101	* @param priv A pointer to wlan_private structure
	102	* @param prxpd A pointer to rxpd structure of received packet
	103	* @return n/a
	104	*/
	105	static void wlan_compute_rssi(wlan_private * priv, struct rxpd *p_rx_pd)
	106	{
	107	wlan_adapter *adapter = priv->adapter;
	108
9012b28a	109	lbs_deb_enter(LBS_DEB_RX);
876c9d3a	110
9012b28a HS	111	lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf);
9012b28a HS	112	lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n",
876c9d3a MT	113	adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	114	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
	115
	116	adapter->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
	117	adapter->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
	118	wlan_save_rawSNRNF(priv, p_rx_pd);
	119
876c9d3a MT	120	adapter->SNR[TYPE_RXPD][TYPE_AVG] = wlan_getavgsnr(priv) * AVG_SCALE;
876c9d3a MT	121	adapter->NF[TYPE_RXPD][TYPE_AVG] = wlan_getavgnf(priv) * AVG_SCALE;
9012b28a	122	lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
876c9d3a MT	123	adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	124	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
	125
	126	adapter->RSSI[TYPE_RXPD][TYPE_NOAVG] =
	127	CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_NOAVG],
	128	adapter->NF[TYPE_RXPD][TYPE_NOAVG]);
	129
	130	adapter->RSSI[TYPE_RXPD][TYPE_AVG] =
	131	CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	132	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
	133
9012b28a	134	lbs_deb_leave(LBS_DEB_RX);
876c9d3a MT	135	}
876c9d3a MT	136
3d4bd24b	137	void libertas_upload_rx_packet(wlan_private * priv, struct sk_buff *skb)
876c9d3a	138	{
9012b28a	139	lbs_deb_rx("skb->data %p\n", skb->data);
876c9d3a	140
78523daa	141	if (priv->mesh_dev && IS_MESH_FRAME(skb))
2fb3bd6a	142	skb->protocol = eth_type_trans(skb, priv->mesh_dev);
876c9d3a	143	else
2fb3bd6a	144	skb->protocol = eth_type_trans(skb, priv->dev);
876c9d3a MT	145	skb->ip_summed = CHECKSUM_UNNECESSARY;
	146
	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	*
	154	* @param priv A pointer to wlan_private
	155	* @param skb A pointer to skb which includes the received packet
	156	* @return 0 or -1
	157	*/
	158	int libertas_process_rxed_packet(wlan_private * priv, struct sk_buff *skb)
	159	{
	160	wlan_adapter *adapter = priv->adapter;
	161	int ret = 0;
	162
	163	struct rxpackethdr *p_rx_pkt;
	164	struct rxpd *p_rx_pd;
	165
	166	int hdrchop;
	167	struct ethhdr *p_ethhdr;
	168
	169	const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	170
9012b28a	171	lbs_deb_enter(LBS_DEB_RX);
876c9d3a	172
876c9d3a MT	173	if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
	174	return process_rxed_802_11_packet(priv, skb);
	175
	176	p_rx_pkt = (struct rxpackethdr *) skb->data;
	177	p_rx_pd = &p_rx_pkt->rx_pd;
	178	if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
	179	SET_MESH_FRAME(skb);
	180	else
	181	UNSET_MESH_FRAME(skb);
	182
ece56191	183	lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
876c9d3a MT	184	min_t(unsigned int, skb->len, 100));
	185
	186	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	187	lbs_deb_rx("rx err: frame received with bad length\n");
876c9d3a MT	188	priv->stats.rx_length_errors++;
	189	ret = 0;
	190	goto done;
	191	}
	192
	193	/*
	194	* Check rxpd status and update 802.3 stat,
	195	*/
981f187b	196	if (!(p_rx_pd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
9012b28a HS	197	lbs_deb_rx("rx err: frame received with bad status\n");
9012b28a HS	198	lbs_pr_alert("rxpd not ok\n");
876c9d3a MT	199	priv->stats.rx_errors++;
	200	ret = 0;
	201	goto done;
	202	}
	203
9012b28a	204	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	205	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
876c9d3a MT	206
ece56191	207	lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
876c9d3a	208	sizeof(p_rx_pkt->eth803_hdr.dest_addr));
ece56191	209	lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
876c9d3a MT	210	sizeof(p_rx_pkt->eth803_hdr.src_addr));
	211
	212	if (memcmp(&p_rx_pkt->rfc1042_hdr,
	213	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
	214	/*
	215	* Replace the 803 header and rfc1042 header (llc/snap) with an
	216	* EthernetII header, keep the src/dst and snap_type (ethertype)
	217	*
	218	* The firmware only passes up SNAP frames converting
	219	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	220	*
	221	* To create the Ethernet II, just move the src, dst address right
	222	* before the snap_type.
	223	*/
	224	p_ethhdr = (struct ethhdr *)
	225	((u8 *) & p_rx_pkt->eth803_hdr
	226	+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
	227	- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
	228	- sizeof(p_rx_pkt->eth803_hdr.src_addr)
	229	- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
	230
	231	memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
	232	sizeof(p_ethhdr->h_source));
	233	memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
	234	sizeof(p_ethhdr->h_dest));
	235
	236	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
	237	* that was removed
	238	*/
	239	hdrchop = (u8 ) p_ethhdr - (u8 ) p_rx_pkt;
	240	} else {
ece56191	241	lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
876c9d3a MT	242	(u8 *) & p_rx_pkt->rfc1042_hdr,
	243	sizeof(p_rx_pkt->rfc1042_hdr));
	244
	245	/* Chop off the rxpd */
	246	hdrchop = (u8 ) & p_rx_pkt->eth803_hdr - (u8 ) p_rx_pkt;
	247	}
	248
	249	/* Chop off the leading header bytes so the skb points to the start of
	250	* either the reconstructed EthII frame or the 802.2/llc/snap frame
	251	*/
	252	skb_pull(skb, hdrchop);
	253
	254	/* Take the data rate from the rxpd structure
	255	* only if the rate is auto
	256	*/
8c512765 DW	257	if (adapter->auto_rate)
8c512765 DW	258	adapter->cur_rate = libertas_fw_index_to_data_rate(p_rx_pd->rx_rate);
876c9d3a MT	259
	260	wlan_compute_rssi(priv, p_rx_pd);
	261
9012b28a	262	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
876c9d3a MT	263	priv->stats.rx_bytes += skb->len;
	264	priv->stats.rx_packets++;
	265
3d4bd24b FM	266	libertas_upload_rx_packet(priv, skb);
3d4bd24b FM	267
876c9d3a MT	268	ret = 0;
876c9d3a MT	269	done:
9012b28a	270	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
876c9d3a MT	271	return ret;
876c9d3a MT	272	}
084708b6	273	EXPORT_SYMBOL_GPL(libertas_process_rxed_packet);
876c9d3a MT	274
	275	/**
	276	* @brief This function converts Tx/Rx rates from the Marvell WLAN format
	277	* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
	278	*
	279	* @param rate Input rate
	280	* @return Output Rate (0 if invalid)
	281	*/
	282	static u8 convert_mv_rate_to_radiotap(u8 rate)
	283	{
	284	switch (rate) {
	285	case 0: /* 1 Mbps */
	286	return 2;
	287	case 1: /* 2 Mbps */
	288	return 4;
	289	case 2: /* 5.5 Mbps */
	290	return 11;
	291	case 3: /* 11 Mbps */
	292	return 22;
	293	case 4: /* 6 Mbps */
	294	return 12;
	295	case 5: /* 9 Mbps */
	296	return 18;
	297	case 6: /* 12 Mbps */
	298	return 24;
	299	case 7: /* 18 Mbps */
	300	return 36;
	301	case 8: /* 24 Mbps */
	302	return 48;
	303	case 9: /* 36 Mbps */
	304	return 72;
	305	case 10: /* 48 Mbps */
	306	return 96;
	307	case 11: /* 54 Mbps */
	308	return 108;
	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	*
	318	* @param priv A pointer to wlan_private
	319	* @param skb A pointer to skb which includes the received packet
	320	* @return 0 or -1
	321	*/
	322	static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb)
	323	{
	324	wlan_adapter *adapter = priv->adapter;
	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 */
	358	switch (priv->adapter->radiomode) {
	359	case WLAN_RADIOMODE_NONE:
	360	/* no radio header */
	361	/* chop the rxpd */
	362	skb_pull(skb, sizeof(struct rxpd));
	363	break;
	364
	365	case WLAN_RADIOMODE_RADIOTAP:
	366	/* radiotap header */
	367	radiotap_hdr.hdr.it_version = 0;
	368	/* XXX must check this value for pad */
	369	radiotap_hdr.hdr.it_pad = 0;
	370	radiotap_hdr.hdr.it_len = sizeof(struct rx_radiotap_hdr);
	371	radiotap_hdr.hdr.it_present = RX_RADIOTAP_PRESENT;
	372	/* unknown values */
	373	radiotap_hdr.flags = 0;
	374	radiotap_hdr.chan_freq = 0;
	375	radiotap_hdr.chan_flags = 0;
	376	radiotap_hdr.antenna = 0;
	377	/* known values */
	378	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	379	/* XXX must check no carryout */
	380	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
	381	radiotap_hdr.rx_flags = 0;
981f187b	382	if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
876c9d3a MT	383	radiotap_hdr.rx_flags \|= IEEE80211_RADIOTAP_F_RX_BADFCS;
	384	//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);
	385
876c9d3a MT	386	/* chop the rxpd */
	387	skb_pull(skb, sizeof(struct rxpd));
	388
	389	/* add space for the new radio header */
	390	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
	391	pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0,
	392	GFP_ATOMIC)) {
9012b28a	393	lbs_pr_alert("%s: couldn't pskb_expand_head\n",
876c9d3a MT	394	__func__);
	395	}
	396
	397	pradiotap_hdr =
	398	(struct rx_radiotap_hdr *)skb_push(skb,
	399	sizeof(struct
	400	rx_radiotap_hdr));
	401	memcpy(pradiotap_hdr, &radiotap_hdr,
	402	sizeof(struct rx_radiotap_hdr));
876c9d3a MT	403	break;
	404
	405	default:
	406	/* unknown header */
9012b28a	407	lbs_pr_alert("Unknown radiomode %i\n",
876c9d3a MT	408	priv->adapter->radiomode);
	409	/* don't export any header */
	410	/* chop the rxpd */
	411	skb_pull(skb, sizeof(struct rxpd));
	412	break;
	413	}
	414
	415	/* Take the data rate from the rxpd structure
	416	* only if the rate is auto
	417	*/
8c512765 DW	418	if (adapter->auto_rate)
8c512765 DW	419	adapter->cur_rate = libertas_fw_index_to_data_rate(prxpd->rx_rate);
876c9d3a MT	420
	421	wlan_compute_rssi(priv, prxpd);
	422
9012b28a	423	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
876c9d3a MT	424	priv->stats.rx_bytes += skb->len;
	425	priv->stats.rx_packets++;
	426
3d4bd24b FM	427	libertas_upload_rx_packet(priv, skb);
3d4bd24b FM	428
876c9d3a	429	ret = 0;
876c9d3a	430
9012b28a	431	done:
9012b28a HS	432	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
9012b28a HS	433	return ret;
876c9d3a	434	}