Release 4.16 drivers/net/wireless/marvell/libertas/rx.c

/*
 * This file contains the handling of RX in wlan driver.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/etherdevice.h>
#include <linux/hardirq.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/export.h>
#include <net/cfg80211.h>

#include "defs.h"
#include "host.h"
#include "radiotap.h"
#include "decl.h"
#include "dev.h"
#include "mesh.h"


struct eth803hdr {
	
u8 dest_addr[6];
	
u8 src_addr[6];
	
u16 h803_len;

} __packed;


struct rfc1042hdr {
	
u8 llc_dsap;
	
u8 llc_ssap;
	
u8 llc_ctrl;
	
u8 snap_oui[3];
	
u16 snap_type;

} __packed;


struct rxpackethdr {
	
struct eth803hdr eth803_hdr;
	
struct rfc1042hdr rfc1042_hdr;

} __packed;


struct rx80211packethdr {
	
struct rxpd rx_pd;
	
void *eth80211_hdr;

} __packed;

static int process_rxed_802_11_packet(struct lbs_private *priv,
	struct sk_buff *skb);

/**
 * lbs_process_rxed_packet - processes received packet and forwards it
 * to kernel/upper layer
 *
 * @priv:       A pointer to &struct lbs_private
 * @skb:        A pointer to skb which includes the received packet
 * returns:     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;
	static const u8 rfc1042_eth_hdr[] = {
		0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
	};

	BUG_ON(!skb);

	skb->ip_summed = CHECKSUM_NONE;

	if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
		ret = process_rxed_802_11_packet(priv, skb);
		goto done;
	}

	p_rx_pd = (struct rxpd *) skb->data;
	p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
		le32_to_cpu(p_rx_pd->pkt_ptr));

	dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);

	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 = -EINVAL;
		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);

	priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);

	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:
	return ret;
}
Contributors
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Marcelo Tosatti
406
73.82%
1
5.00%
Holger Schurig
44
8.00%
7
35.00%
Bing Zhao
34
6.18%
2
10.00%
David Woodhouse
30
5.45%
2
10.00%
Dan J Williams
11
2.00%
2
10.00%
John W. Linville
6
1.09%
1
5.00%
Florin Malita
5
0.91%
1
5.00%
Philip Rakity
5
0.91%
1
5.00%
Kiran Divekar
5
0.91%
1
5.00%
Stephen Hemminger
3
0.55%
1
5.00%
Joe Perches
1
0.18%
1
5.00%
Total
550
100.00%
20
100.00%

EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);

/**
 * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format
 * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
 *
 * @rate:       Input rate
 * returns:     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;
	}
	pr_alert("Invalid Marvell WLAN rate %i\n", rate);
	return 0;
}

Contributors
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Marcelo Tosatti
99
90.00%
1
25.00%
Luis Carlos Cobo Rus
9
8.18%
1
25.00%
Joe Perches
1
0.91%
1
25.00%
Holger Schurig
1
0.91%
1
25.00%
Total
110
100.00%
4
100.00%

/**
 * process_rxed_802_11_packet - processes a received 802.11 packet and forwards
 * it to kernel/upper layer
 *
 * @priv:       A pointer to &struct lbs_private
 * @skb:        A pointer to skb which includes the received packet
 * returns:     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;

	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 */
	memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
	/* XXX must check radiotap_hdr.hdr.it_pad for pad */
	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)) {
		netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__);
		ret = -ENOMEM;
		kfree_skb(skb);
		goto done;
	}

	pradiotap_hdr = skb_push(skb, sizeof(struct rx_radiotap_hdr));
	memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));

	priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);

	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->dev);

	if (in_interrupt())
		netif_rx(skb);
	else
		netif_rx_ni(skb);

	ret = 0;

done:
	return ret;
}
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Marcelo Tosatti
281
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David Woodhouse
33
8.85%
3
18.75%
Stephen Hemminger
12
3.22%
1
6.25%
Kiran Divekar
12
3.22%
1
6.25%
Prarit Bhargava
10
2.68%
1
6.25%
Holger Schurig
8
2.14%
3
18.75%
Dan J Williams
7
1.88%
2
12.50%
Florin Malita
5
1.34%
1
6.25%
Joe Perches
3
0.80%
1
6.25%
Sergio Luis
1
0.27%
1
6.25%
Stewart Malik
1
0.27%
1
6.25%
Total
373
100.00%
16
100.00%

Overall Contributors
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Tokens
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Commits
CommitProp
Marcelo Tosatti
884
75.36%
1
2.86%
David Woodhouse
63
5.37%
3
8.57%
Holger Schurig
60
5.12%
8
22.86%
Bing Zhao
34
2.90%
2
5.71%
Kiran Divekar
25
2.13%
1
2.86%
Dan J Williams
18
1.53%
3
8.57%
Stephen Hemminger
15
1.28%
1
2.86%
Joe Perches
12
1.02%
3
8.57%
Florin Malita
10
0.85%
1
2.86%
Prarit Bhargava
10
0.85%
1
2.86%
Luis Carlos Cobo Rus
9
0.77%
1
2.86%
John W. Linville
6
0.51%
1
2.86%
Philip Rakity
5
0.43%
1
2.86%
Randy Dunlap
4
0.34%
1
2.86%
Eric Dumazet
4
0.34%
1
2.86%
Paul Gortmaker
3
0.26%
1
2.86%
Daniel Drake
3
0.26%
1
2.86%
Alexey Dobriyan
3
0.26%
1
2.86%
Tejun Heo
3
0.26%
1
2.86%
Sergio Luis
1
0.09%
1
2.86%
Stewart Malik
1
0.09%
1
2.86%
Total
1173
100.00%
35
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Directory: drivers/net/wireless/marvell/libertas

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