/**  * 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->adapter->monitormode != WLAN_MONITOR_OFF) {		skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);	} else {		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->monitormode != WLAN_MONITOR_OFF)		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: 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 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 */	if(priv->adapter->monitormode == WLAN_MONITOR_OFF) {		/* no radio header */		/* chop the rxpd */		skb_pull(skb, sizeof(struct rxpd));	}	else {		/* 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);		/* 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));	}	/* 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;}