1 files changed, 459 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas/rx.c b/drivers/net/wireless/libertas/rx.c
new file mode 100644
index 000000000000..7e3f78f092dc
--- /dev/null
+++ b/drivers/net/wireless/libertas/rx.c
@@ -0,0 +1,459 @@
+/**
+  * 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;
+
+	ENTER();
+
+	lbs_pr_debug(1, "rxpd: SNR = %d, NF = %d\n", p_rx_pd->snr, p_rx_pd->nf);
+	lbs_pr_debug(1, "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_pr_debug(1, "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);
+
+	LEAVE();
+}
+
+int libertas_upload_rx_packet(wlan_private * priv, struct sk_buff *skb)
+{
+	lbs_pr_debug(1, "skb->data=%p\n", skb->data);
+
+	if(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);
+
+	return 0;
+}
+
+/**
+ *  @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 };
+
+	ENTER();
+
+	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_pr_debug(1, "RX error: 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_pr_debug(1, "RX error: frame received with bad status\n");
+		lbs_pr_alert("rxpd Not OK\n");
+		priv->stats.rx_errors++;
+		ret = 0;
+		goto done;
+	}
+
+	lbs_pr_debug(1, "RX Data: skb->len - sizeof(RxPd) = %d - %d = %d\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_pr_debug(1, "RX Data: size of actual packet = %d\n", skb->len);
+	if (libertas_upload_rx_packet(priv, skb)) {
+		lbs_pr_debug(1, "RX error: libertas_upload_rx_packet"
+		       " returns failure\n");
+		ret = -1;
+		goto done;
+	}
+	priv->stats.rx_bytes += skb->len;
+	priv->stats.rx_packets++;
+
+	ret = 0;
+done:
+	LEAVE();
+
+	return ret;
+}
+
+/**
+ *  @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;
+
+	ENTER();
+
+	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_pr_debug(1, "RX error: FRAME RECEIVED WITH 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_pr_debug(1, "RX error: frame received with bad status\n");
+		priv->stats.rx_errors++;
+	}
+
+	lbs_pr_debug(1, "RX Data: skb->len - sizeof(RxPd) = %d - %d = %d\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_pr_debug(1, "RX Data: size of actual packet = %d\n", skb->len);
+
+	if (libertas_upload_rx_packet(priv, skb)) {
+		lbs_pr_debug(1, "RX error: libertas_upload_rx_packet "
+			"returns failure\n");
+		ret = -1;
+		goto done;
+	}
+
+	priv->stats.rx_bytes += skb->len;
+	priv->stats.rx_packets++;
+
+	ret = 0;
+done:
+	LEAVE();
+
+	skb->protocol = __constant_htons(0x0019);	/* ETH_P_80211_RAW */
+
+	return (ret);
+}