Contributors: 18
Author Tokens Token Proportion Commits Commit Proportion
Marcelo Tosatti 496 54.15% 1 2.50%
David Woodhouse 279 30.46% 11 27.50%
Holger Schurig 34 3.71% 10 25.00%
Kiran Divekar 23 2.51% 2 5.00%
Pengpeng Hou 21 2.29% 1 2.50%
Kees Cook 16 1.75% 1 2.50%
Javier Cardona 15 1.64% 2 5.00%
Stephen Hemminger 10 1.09% 2 5.00%
Randy Dunlap 4 0.44% 1 2.50%
Bing Zhao 3 0.33% 1 2.50%
Domen Puncer 3 0.33% 1 2.50%
Paul Gortmaker 3 0.33% 1 2.50%
Daniel Drake 3 0.33% 1 2.50%
Linus Torvalds (pre-git) 2 0.22% 1 2.50%
Christoph Hellwig 1 0.11% 1 2.50%
Brajesh Dave 1 0.11% 1 2.50%
Dan Carpenter 1 0.11% 1 2.50%
Thomas Gleixner 1 0.11% 1 2.50%
Total 916 40 


// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file contains the handling of TX in wlan driver.
 */
#include <linux/hardirq.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/sched.h>
#include <linux/export.h>
#include <net/cfg80211.h>

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

/**
 * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
 *
 * @rate:	Input rate
 * returns:	Output Rate (0 if invalid)
 */
static u32 convert_radiotap_rate_to_mv(u8 rate)
{
	switch (rate) {
	case 2:		/*   1 Mbps */
		return 0 | (1 << 4);
	case 4:		/*   2 Mbps */
		return 1 | (1 << 4);
	case 11:		/* 5.5 Mbps */
		return 2 | (1 << 4);
	case 22:		/*  11 Mbps */
		return 3 | (1 << 4);
	case 12:		/*   6 Mbps */
		return 4 | (1 << 4);
	case 18:		/*   9 Mbps */
		return 5 | (1 << 4);
	case 24:		/*  12 Mbps */
		return 6 | (1 << 4);
	case 36:		/*  18 Mbps */
		return 7 | (1 << 4);
	case 48:		/*  24 Mbps */
		return 8 | (1 << 4);
	case 72:		/*  36 Mbps */
		return 9 | (1 << 4);
	case 96:		/*  48 Mbps */
		return 10 | (1 << 4);
	case 108:		/*  54 Mbps */
		return 11 | (1 << 4);
	}
	return 0;
}

/**
 * lbs_hard_start_xmit - checks the conditions and sends packet to IF
 * layer if everything is ok
 *
 * @skb:	A pointer to skb which includes TX packet
 * @dev:	A pointer to the &struct net_device
 * returns:	0 or -1
 */
netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	unsigned long flags;
	struct lbs_private *priv = dev->ml_priv;
	struct txpd *txpd;
	char *p802x_hdr;
	uint16_t pkt_len;
	netdev_tx_t ret = NETDEV_TX_OK;

	/* We need to protect against the queues being restarted before
	   we get round to stopping them */
	spin_lock_irqsave(&priv->driver_lock, flags);

	if (priv->surpriseremoved)
		goto free;

	if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
		lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
		       skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
		/* We'll never manage to send this one; drop it and return 'OK' */

		dev->stats.tx_dropped++;
		dev->stats.tx_errors++;
		goto free;
	}


	netif_stop_queue(priv->dev);
	if (priv->mesh_dev)
		netif_stop_queue(priv->mesh_dev);

	if (priv->tx_pending_len) {
		/* This can happen if packets come in on the mesh and eth
		   device simultaneously -- there's no mutual exclusion on
		   hard_start_xmit() calls between devices. */
		lbs_deb_tx("Packet on %s while busy\n", dev->name);
		ret = NETDEV_TX_BUSY;
		goto unlock;
	}

	priv->tx_pending_len = -1;
	spin_unlock_irqrestore(&priv->driver_lock, flags);

	lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));

	txpd = (void *)priv->tx_pending_buf;
	memset(txpd, 0, sizeof(struct txpd));

	p802x_hdr = skb->data;
	pkt_len = skb->len;

	BUILD_BUG_ON(sizeof(txpd->tx_dest_addr) != ETH_ALEN);
	if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
		struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;

		if (skb->len < sizeof(*rtap_hdr) + 4 + ETH_ALEN) {
			lbs_deb_tx("tx err: short monitor frame %u\n", skb->len);
			dev->stats.tx_dropped++;
			dev->stats.tx_errors++;
			goto free;
		}

		/* set txpd fields from the radiotap header */
		txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));

		/* skip the radiotap header */
		p802x_hdr += sizeof(*rtap_hdr);
		pkt_len -= sizeof(*rtap_hdr);

		/* copy destination address from 802.11 header */
		memcpy(&txpd->tx_dest_addr, p802x_hdr + 4, ETH_ALEN);
	} else {
		/* copy destination address from 802.3 header */
		memcpy(&txpd->tx_dest_addr, p802x_hdr, ETH_ALEN);
	}

	txpd->tx_packet_length = cpu_to_le16(pkt_len);
	txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));

	lbs_mesh_set_txpd(priv, dev, txpd);

	lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));

	lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));

	memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));

	spin_lock_irqsave(&priv->driver_lock, flags);
	priv->tx_pending_len = pkt_len + sizeof(struct txpd);

	lbs_deb_tx("%s lined up packet\n", __func__);

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;

	if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
		/* Keep the skb to echo it back once Tx feedback is
		   received from FW */
		skb_orphan(skb);

		/* Keep the skb around for when we get feedback */
		priv->currenttxskb = skb;
	} else {
 free:
		dev_kfree_skb_any(skb);
	}

 unlock:
	spin_unlock_irqrestore(&priv->driver_lock, flags);
	wake_up(&priv->waitq);

	return ret;
}

/**
 * lbs_send_tx_feedback - sends to the host the last transmitted packet,
 * filling the radiotap headers with transmission information.
 *
 * @priv:	A pointer to &struct lbs_private structure
 * @try_count:	A 32-bit value containing transmission retry status.
 *
 * returns:	void
 */
void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
{
	struct tx_radiotap_hdr *radiotap_hdr;

	if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
	    priv->currenttxskb == NULL)
		return;

	radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;

	radiotap_hdr->data_retries = try_count ?
		(1 + priv->txretrycount - try_count) : 0;

	priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
						      priv->dev);
	netif_rx(priv->currenttxskb);

	priv->currenttxskb = NULL;

	if (priv->connect_status == LBS_CONNECTED)
		netif_wake_queue(priv->dev);

	if (priv->mesh_dev && netif_running(priv->mesh_dev))
		netif_wake_queue(priv->mesh_dev);
}
EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);