Re: Prolific 2501 link cable

Am Freitag, 5. Oktober 2007 11:49 schrieb Tobias:
> The function *pl_tx_fixup corrected:
>
>
> static struct sk_buff *pl_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
> gfp_t flags)
> {
> 	int	length = skb->len;
> 	u32	*packet_len;
>
> 	// attach the packet count to the header
> 	packet_len = (u32 *) skb_push(skb,4);
>
> 	*packet_len = cpu_to_le32(length);
>
> 	return skb;
> }

Sorry for this mail, it was sent inadvertently. The whole function now:

static struct sk_buff *pl_tx_fixup(struct usbnet *dev, struct sk_buff *skb, 
gfp_t flags)
{
	int 	padlen;
	int	length = skb->len;
	int	headroom = skb_headroom(skb);
	int	tailroom = skb_tailroom(skb);
	u32	*packet_len;

	// FIXME:  magic numbers, bleech
	padlen = ((skb->len + 4) % 64) ? 0 : 1;

	if ((!skb_cloned(skb))
			&& ((headroom + tailroom) >= (padlen + 4))) {
		if ((headroom < 4) || (tailroom < padlen)) {
			skb->data = memmove(skb->head + 4,
					     skb->data, skb->len);
			skb->tail = skb->data + skb->len;
		}
	} else {
		struct sk_buff	*skb2;
		skb2 = skb_copy_expand(skb,4,padlen,flags);
		dev_kfree_skb_any(skb);
		skb = skb2;
		if (!skb)
			return NULL;
	}

	// attach the packet count to the header
	packet_len = (u32 *) skb_push(skb,4);

	*packet_len = cpu_to_le32(length);

	return skb;
}

>
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