On Thu, 2007-02-15 at 00:57 +1100, Herbert Xu wrote:

On Wed, Feb 14, 2007 at 03:47:55PM +1100, Rusty Russell wrote:

quoted

It's also used to generate dma structs for outgoing packets.  In that
case, skb_headlen() == 0:

I see, in that case you're guaranteed to have no fragments.
Still it feels a bit weird to have a length field that only
applies to the header part.

Indeed.  In future if I want to create fragmented skbs for receive
(large MTU support), I would actually set skb->len and skb->datalen and
then could avoid the extra argument.

Cheers,
Rusty.