static void z8530_tx_done(struct z8530_channel *c)
{
struct sk_buff *skb;
/* Actually this can happen.*/
if (c->tx_skb == NULL)
return;
skb = c->tx_skb;
c->tx_skb = NULL;
z8530_tx_begin(c);
c->netdevice->stats.tx_packets++;
c->netdevice->stats.tx_bytes += skb->len;
dev_kfree_skb_irq(skb);
}
int z8530_queue_xmit(struct z8530_channel *c, struct sk_buff *skb)
{
unsigned long flags;
netif_stop_queue(c->netdevice);
if(c->tx_next_skb)
{
return 1;
}
/* PC SPECIFIC - DMA limits */
/*
* If we will DMA the transmit and its gone over the ISA bus
* limit, then copy to the flip buffer
*/
if(c->dma_tx && ((unsigned long)(virt_to_bus(skb->data+skb->len))>=16*1024*1024 || spans_boundary(skb)))
{
/*
* Send the flip buffer, and flip the flippy bit.
* We don't care which is used when just so long as
* we never use the same buffer twice in a row. Since
* only one buffer can be going out at a time the other
* has to be safe.
*/
c->tx_next_ptr=c->tx_dma_buf[c->tx_dma_used];
c->tx_dma_used^=1; /* Flip temp buffer */
skb_copy_from_linear_data(skb, c->tx_next_ptr, skb->len);
}
else
c->tx_next_ptr=skb->data;
RT_LOCK;
c->tx_next_skb=skb;
RT_UNLOCK;
spin_lock_irqsave(c->lock, flags);
z8530_tx_begin(c);
spin_unlock_irqrestore(c->lock, flags);
return 0;
}
