Re: [PATCH V5 2/6 net-next] netdevice.h: Add zero-copy flag in netdevice

Shirley Ma
2011-05-17T22:28:48Z

On Tue, 2011-05-17 at 23:48 +0200, Michał Mirosław wrote:
> 2011/5/17 Shirley Ma <mashirle@us.ibm.com>:
> > Hello Michael,
> >
> > Looks like to use a new flag requires more time/work. I am thinking
> > whether we can just use HIGHDMA flag to enable zero-copy in macvtap
> to
> > avoid the new flag for now since mavctap uses real NICs as lower
> device?
>
> Is there any other restriction besides requiring driver to not recycle
> the skb? Are there any drivers that recycle TX skbs?

Not more other restrictions, skb clone is OK. pskb_expand_head() looks
OK to me from code review.

Currently there is no drivers recycle TX skbs.

Thanks
Shirley