Ejemplo n.º 1
0
/*
 * Transmit a packet
 */
static int
ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;
	unsigned long flags;
	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
	unsigned int ptr, next_ptr;

	length = (length + 1) & ~1;

	if (priv->broken) {
		dev_kfree_skb(skb);
		priv->stats.tx_dropped ++;
		netif_start_queue(dev);
		return 0;
	}

	next_ptr = (priv->tx_head + 1) & 15;

	save_flags_cli(flags);

	if (priv->tx_tail == next_ptr) {
		restore_flags(flags);
		return 1;	/* unable to queue */
	}

	dev->trans_start = jiffies;
	ptr		 = 0x600 * priv->tx_head;
	priv->tx_head	 = next_ptr;
	next_ptr	*= 0x600;

#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)

	ether3_setbuffer(dev, buffer_write, next_ptr);
	ether3_writelong(dev, 0);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writelong(dev, 0);
	ether3_writebuffer(dev, skb->data, length);
	ether3_writeword(dev, htons(next_ptr));
	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writeword(dev, htons((ptr + length + 4)));
	ether3_writeword(dev, TXHDR_FLAGS >> 16);
	ether3_ledon(dev, priv);

	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
		ether3_outw(ptr, REG_TRANSMITPTR);
		ether3_outw(priv->regs.command | CMD_TXON, REG_COMMAND);
	}

	next_ptr = (priv->tx_head + 1) & 15;
	restore_flags(flags);

	dev_kfree_skb(skb);

	if (priv->tx_tail == next_ptr)
		netif_stop_queue(dev);

	return 0;
}
Ejemplo n.º 2
0
/*
 * Transmit a packet
 */
static int
ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
{
	unsigned long flags;
	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
	unsigned int ptr, next_ptr;

	if (priv(dev)->broken) {
		dev_kfree_skb(skb);
		dev->stats.tx_dropped++;
		netif_start_queue(dev);
		return NETDEV_TX_OK;
	}

	length = (length + 1) & ~1;
	if (length != skb->len) {
		if (skb_padto(skb, length))
			goto out;
	}

	next_ptr = (priv(dev)->tx_head + 1) & 15;

	local_irq_save(flags);

	if (priv(dev)->tx_tail == next_ptr) {
		local_irq_restore(flags);
		return NETDEV_TX_BUSY;	/* unable to queue */
	}

	ptr		 = 0x600 * priv(dev)->tx_head;
	priv(dev)->tx_head = next_ptr;
	next_ptr	*= 0x600;

#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)

	ether3_setbuffer(dev, buffer_write, next_ptr);
	ether3_writelong(dev, 0);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writelong(dev, 0);
	ether3_writebuffer(dev, skb->data, length);
	ether3_writeword(dev, htons(next_ptr));
	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writeword(dev, htons((ptr + length + 4)));
	ether3_writeword(dev, TXHDR_FLAGS >> 16);
	ether3_ledon(dev);

	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
		ether3_outw(ptr, REG_TRANSMITPTR);
		ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
	}

	next_ptr = (priv(dev)->tx_head + 1) & 15;
	local_irq_restore(flags);

	dev_kfree_skb(skb);

	if (priv(dev)->tx_tail == next_ptr)
		netif_stop_queue(dev);

 out:
	return NETDEV_TX_OK;
}
Ejemplo n.º 3
0
/*
 * Transmit a packet
 */
static int
ether3_sendpacket(struct sk_buff *skb, struct device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;
retry:
	if (!dev->tbusy) {
		/* Block a timer-based transmit from overlapping.  This could better be
		 * done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
		 */
		if (!test_and_set_bit(0, (void *)&dev->tbusy)) {
			unsigned long flags;
			unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
			unsigned int ptr, next_ptr;

			length = (length + 1) & ~1;

			if (priv->broken) {
				dev_kfree_skb(skb);
				priv->stats.tx_dropped ++;
				dev->tbusy = 0;
				return 0;
			}

			next_ptr = (priv->tx_head + 1) & 15;

			save_flags_cli(flags);

			if (priv->tx_tail == next_ptr) {
				restore_flags(flags);
				return 1;	/* unable to queue */
			}

			dev->trans_start = jiffies;
			ptr		 = 0x600 * priv->tx_head;
			priv->tx_head	 = next_ptr;
			next_ptr	*= 0x600;

#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)

			ether3_setbuffer(dev, buffer_write, next_ptr);
			ether3_writelong(dev, 0);
			ether3_setbuffer(dev, buffer_write, ptr);
			ether3_writelong(dev, 0);
			ether3_writebuffer(dev, skb->data, length);
			ether3_writeword(dev, htons(next_ptr));
			ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
			ether3_setbuffer(dev, buffer_write, ptr);
			ether3_writeword(dev, htons((ptr + length + 4)));
			ether3_writeword(dev, TXHDR_FLAGS >> 16);
			ether3_ledon(dev, priv);

			if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
				ether3_outw(ptr, REG_TRANSMITPTR);
				ether3_outw(priv->regs.command | CMD_TXON, REG_COMMAND);
			}

			next_ptr = (priv->tx_head + 1) & 15;
			if (priv->tx_tail != next_ptr)
				dev->tbusy = 0;

			restore_flags(flags);

			dev_kfree_skb(skb);

			return 0;
		} else {