[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 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 < adapter->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 >= adapter->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->rxpd_rate = p_rx_pd->rx_rate;

	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->dev = priv->mesh_dev;
	else
		skb->dev = priv->wlan_dev.netdev;
	skb->protocol = eth_type_trans(skb, priv->wlan_dev.netdev);
	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->debugmode & MRVDRV_DEBUG_RX_PATH)
		lbs_dbg_hex("RX packet: ", skb->data,
			 min_t(unsigned int, skb->len, 100));

	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_dbg_hex("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 & 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_dbg_hex("RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
		sizeof(p_rx_pkt->eth803_hdr.dest_addr));
	lbs_dbg_hex("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_dbg_hex("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->is_datarate_auto)
		adapter->datarate = libertas_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_dbg_hex("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 & 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 & MRVDRV_RXPD_STATUS_OK))
			radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS;
		//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);

		// lbs_dbg_hex1("RX radiomode packet BEF: ", skb->data, min(skb->len, 100));

		/* 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));
		//lbs_dbg_hex1("RX radiomode packet AFT: ", skb->data, min(skb->len, 100));
		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->is_datarate_auto) {
		adapter->datarate = libertas_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:
	skb->protocol = __constant_htons(0x0019);	/* ETH_P_80211_RAW */
	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;
88	if (adapter->numSNRNF < adapter->data_avg_factor)
89	adapter->numSNRNF++;
90	adapter->rawSNR[adapter->nextSNRNF] = p_rx_pd->snr;
91	adapter->rawNF[adapter->nextSNRNF] = p_rx_pd->nf;
92	adapter->nextSNRNF++;
93	if (adapter->nextSNRNF >= adapter->data_avg_factor)
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
	120	adapter->rxpd_rate = p_rx_pd->rx_rate;
	121
	122	adapter->SNR[TYPE_RXPD][TYPE_AVG] = wlan_getavgsnr(priv) * AVG_SCALE;
	123	adapter->NF[TYPE_RXPD][TYPE_AVG] = wlan_getavgnf(priv) * AVG_SCALE;
9012b28a	124	lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
876c9d3a MT	125	adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	126	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
	127
	128	adapter->RSSI[TYPE_RXPD][TYPE_NOAVG] =
	129	CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_NOAVG],
	130	adapter->NF[TYPE_RXPD][TYPE_NOAVG]);
	131
	132	adapter->RSSI[TYPE_RXPD][TYPE_AVG] =
	133	CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
	134	adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
	135
9012b28a	136	lbs_deb_leave(LBS_DEB_RX);
876c9d3a MT	137	}
876c9d3a MT	138
3d4bd24b	139	void libertas_upload_rx_packet(wlan_private * priv, struct sk_buff *skb)
876c9d3a	140	{
9012b28a	141	lbs_deb_rx("skb->data %p\n", skb->data);
876c9d3a	142
78523daa	143	if (priv->mesh_dev && IS_MESH_FRAME(skb))
876c9d3a MT	144	skb->dev = priv->mesh_dev;
	145	else
	146	skb->dev = priv->wlan_dev.netdev;
	147	skb->protocol = eth_type_trans(skb, priv->wlan_dev.netdev);
	148	skb->ip_summed = CHECKSUM_UNNECESSARY;
	149
	150	netif_rx(skb);
876c9d3a MT	151	}
	152
	153	/**
	154	* @brief This function processes received packet and forwards it
	155	* to kernel/upper layer
	156	*
	157	* @param priv A pointer to wlan_private
	158	* @param skb A pointer to skb which includes the received packet
	159	* @return 0 or -1
	160	*/
	161	int libertas_process_rxed_packet(wlan_private * priv, struct sk_buff *skb)
	162	{
	163	wlan_adapter *adapter = priv->adapter;
	164	int ret = 0;
	165
	166	struct rxpackethdr *p_rx_pkt;
	167	struct rxpd *p_rx_pd;
	168
	169	int hdrchop;
	170	struct ethhdr *p_ethhdr;
	171
	172	const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	173
9012b28a	174	lbs_deb_enter(LBS_DEB_RX);
876c9d3a MT	175
	176	if (priv->adapter->debugmode & MRVDRV_DEBUG_RX_PATH)
	177	lbs_dbg_hex("RX packet: ", skb->data,
	178	min_t(unsigned int, skb->len, 100));
	179
	180	if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
	181	return process_rxed_802_11_packet(priv, skb);
	182
	183	p_rx_pkt = (struct rxpackethdr *) skb->data;
	184	p_rx_pd = &p_rx_pkt->rx_pd;
	185	if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
	186	SET_MESH_FRAME(skb);
	187	else
	188	UNSET_MESH_FRAME(skb);
	189
	190	lbs_dbg_hex("RX Data: Before chop rxpd", skb->data,
	191	min_t(unsigned int, skb->len, 100));
	192
	193	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	194	lbs_deb_rx("rx err: frame received with bad length\n");
876c9d3a MT	195	priv->stats.rx_length_errors++;
	196	ret = 0;
	197	goto done;
	198	}
	199
	200	/*
	201	* Check rxpd status and update 802.3 stat,
	202	*/
	203	if (!(p_rx_pd->status & MRVDRV_RXPD_STATUS_OK)) {
9012b28a HS	204	lbs_deb_rx("rx err: frame received with bad status\n");
9012b28a HS	205	lbs_pr_alert("rxpd not ok\n");
876c9d3a MT	206	priv->stats.rx_errors++;
	207	ret = 0;
	208	goto done;
	209	}
	210
9012b28a	211	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	212	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
	213
	214	lbs_dbg_hex("RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
	215	sizeof(p_rx_pkt->eth803_hdr.dest_addr));
	216	lbs_dbg_hex("RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
	217	sizeof(p_rx_pkt->eth803_hdr.src_addr));
	218
	219	if (memcmp(&p_rx_pkt->rfc1042_hdr,
	220	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
	221	/*
	222	* Replace the 803 header and rfc1042 header (llc/snap) with an
	223	* EthernetII header, keep the src/dst and snap_type (ethertype)
	224	*
	225	* The firmware only passes up SNAP frames converting
	226	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	227	*
	228	* To create the Ethernet II, just move the src, dst address right
	229	* before the snap_type.
	230	*/
	231	p_ethhdr = (struct ethhdr *)
	232	((u8 *) & p_rx_pkt->eth803_hdr
	233	+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
	234	- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
	235	- sizeof(p_rx_pkt->eth803_hdr.src_addr)
	236	- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
	237
	238	memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
	239	sizeof(p_ethhdr->h_source));
	240	memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
	241	sizeof(p_ethhdr->h_dest));
	242
	243	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
	244	* that was removed
	245	*/
	246	hdrchop = (u8 ) p_ethhdr - (u8 ) p_rx_pkt;
	247	} else {
	248	lbs_dbg_hex("RX Data: LLC/SNAP",
	249	(u8 *) & p_rx_pkt->rfc1042_hdr,
	250	sizeof(p_rx_pkt->rfc1042_hdr));
	251
	252	/* Chop off the rxpd */
	253	hdrchop = (u8 ) & p_rx_pkt->eth803_hdr - (u8 ) p_rx_pkt;
	254	}
	255
	256	/* Chop off the leading header bytes so the skb points to the start of
	257	* either the reconstructed EthII frame or the 802.2/llc/snap frame
	258	*/
	259	skb_pull(skb, hdrchop);
	260
	261	/* Take the data rate from the rxpd structure
	262	* only if the rate is auto
	263	*/
	264	if (adapter->is_datarate_auto)
	265	adapter->datarate = libertas_index_to_data_rate(p_rx_pd->rx_rate);
	266
	267	wlan_compute_rssi(priv, p_rx_pd);
	268
9012b28a	269	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
876c9d3a MT	270	priv->stats.rx_bytes += skb->len;
	271	priv->stats.rx_packets++;
	272
3d4bd24b FM	273	libertas_upload_rx_packet(priv, skb);
3d4bd24b FM	274
876c9d3a MT	275	ret = 0;
876c9d3a MT	276	done:
9012b28a	277	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
876c9d3a MT	278	return ret;
876c9d3a MT	279	}
084708b6	280	EXPORT_SYMBOL_GPL(libertas_process_rxed_packet);
876c9d3a MT	281
	282	/**
	283	* @brief This function converts Tx/Rx rates from the Marvell WLAN format
	284	* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
	285	*
	286	* @param rate Input rate
	287	* @return Output Rate (0 if invalid)
	288	*/
	289	static u8 convert_mv_rate_to_radiotap(u8 rate)
	290	{
	291	switch (rate) {
	292	case 0: /* 1 Mbps */
	293	return 2;
	294	case 1: /* 2 Mbps */
	295	return 4;
	296	case 2: /* 5.5 Mbps */
	297	return 11;
	298	case 3: /* 11 Mbps */
	299	return 22;
	300	case 4: /* 6 Mbps */
	301	return 12;
	302	case 5: /* 9 Mbps */
	303	return 18;
	304	case 6: /* 12 Mbps */
	305	return 24;
	306	case 7: /* 18 Mbps */
	307	return 36;
	308	case 8: /* 24 Mbps */
	309	return 48;
	310	case 9: /* 36 Mbps */
	311	return 72;
	312	case 10: /* 48 Mbps */
	313	return 96;
	314	case 11: /* 54 Mbps */
	315	return 108;
	316	}
9012b28a	317	lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
876c9d3a MT	318	return 0;
	319	}
	320
	321	/**
	322	* @brief This function processes a received 802.11 packet and forwards it
	323	* to kernel/upper layer
	324	*
	325	* @param priv A pointer to wlan_private
	326	* @param skb A pointer to skb which includes the received packet
	327	* @return 0 or -1
	328	*/
	329	static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb)
	330	{
	331	wlan_adapter *adapter = priv->adapter;
	332	int ret = 0;
	333
	334	struct rx80211packethdr *p_rx_pkt;
	335	struct rxpd *prxpd;
	336	struct rx_radiotap_hdr radiotap_hdr;
	337	struct rx_radiotap_hdr *pradiotap_hdr;
	338
9012b28a	339	lbs_deb_enter(LBS_DEB_RX);
876c9d3a MT	340
	341	p_rx_pkt = (struct rx80211packethdr *) skb->data;
	342	prxpd = &p_rx_pkt->rx_pd;
	343
	344	// lbs_dbg_hex("RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
	345
	346	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
9012b28a	347	lbs_deb_rx("rx err: frame received wit bad length\n");
876c9d3a MT	348	priv->stats.rx_length_errors++;
	349	ret = 0;
	350	goto done;
	351	}
	352
	353	/*
	354	* Check rxpd status and update 802.3 stat,
	355	*/
	356	if (!(prxpd->status & MRVDRV_RXPD_STATUS_OK)) {
9012b28a	357	//lbs_deb_rx("rx err: frame received with bad status\n");
876c9d3a MT	358	priv->stats.rx_errors++;
	359	}
	360
9012b28a	361	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
876c9d3a MT	362	skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
	363
	364	/* create the exported radio header */
	365	switch (priv->adapter->radiomode) {
	366	case WLAN_RADIOMODE_NONE:
	367	/* no radio header */
	368	/* chop the rxpd */
	369	skb_pull(skb, sizeof(struct rxpd));
	370	break;
	371
	372	case WLAN_RADIOMODE_RADIOTAP:
	373	/* radiotap header */
	374	radiotap_hdr.hdr.it_version = 0;
	375	/* XXX must check this value for pad */
	376	radiotap_hdr.hdr.it_pad = 0;
	377	radiotap_hdr.hdr.it_len = sizeof(struct rx_radiotap_hdr);
	378	radiotap_hdr.hdr.it_present = RX_RADIOTAP_PRESENT;
	379	/* unknown values */
	380	radiotap_hdr.flags = 0;
	381	radiotap_hdr.chan_freq = 0;
	382	radiotap_hdr.chan_flags = 0;
	383	radiotap_hdr.antenna = 0;
	384	/* known values */
	385	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
	386	/* XXX must check no carryout */
	387	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
	388	radiotap_hdr.rx_flags = 0;
	389	if (!(prxpd->status & MRVDRV_RXPD_STATUS_OK))
	390	radiotap_hdr.rx_flags \|= IEEE80211_RADIOTAP_F_RX_BADFCS;
	391	//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);
	392
	393	// lbs_dbg_hex1("RX radiomode packet BEF: ", skb->data, min(skb->len, 100));
	394
	395	/* chop the rxpd */
	396	skb_pull(skb, sizeof(struct rxpd));
	397
	398	/* add space for the new radio header */
	399	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
	400	pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0,
	401	GFP_ATOMIC)) {
9012b28a	402	lbs_pr_alert("%s: couldn't pskb_expand_head\n",
876c9d3a MT	403	__func__);
	404	}
	405
	406	pradiotap_hdr =
	407	(struct rx_radiotap_hdr *)skb_push(skb,
	408	sizeof(struct
	409	rx_radiotap_hdr));
	410	memcpy(pradiotap_hdr, &radiotap_hdr,
	411	sizeof(struct rx_radiotap_hdr));
	412	//lbs_dbg_hex1("RX radiomode packet AFT: ", skb->data, min(skb->len, 100));
	413	break;
	414
	415	default:
	416	/* unknown header */
9012b28a	417	lbs_pr_alert("Unknown radiomode %i\n",
876c9d3a MT	418	priv->adapter->radiomode);
	419	/* don't export any header */
	420	/* chop the rxpd */
	421	skb_pull(skb, sizeof(struct rxpd));
	422	break;
	423	}
	424
	425	/* Take the data rate from the rxpd structure
	426	* only if the rate is auto
	427	*/
	428	if (adapter->is_datarate_auto) {
	429	adapter->datarate = libertas_index_to_data_rate(prxpd->rx_rate);
	430	}
	431
	432	wlan_compute_rssi(priv, prxpd);
	433
9012b28a	434	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
876c9d3a MT	435	priv->stats.rx_bytes += skb->len;
	436	priv->stats.rx_packets++;
	437
3d4bd24b FM	438	libertas_upload_rx_packet(priv, skb);
3d4bd24b FM	439
876c9d3a	440	ret = 0;
876c9d3a	441
9012b28a HS	442	done:
	443	skb->protocol = __constant_htons(0x0019); /* ETH_P_80211_RAW */
	444	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
	445	return ret;
876c9d3a	446	}