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

Shirley Ma
2011-05-18T17:00:28Z

On Wed, 2011-05-18 at 19:51 +0300, Michael S. Tsirkin wrote:
> > > Yes, I agree. I think for tcpdump, we really need to copy the
> data
> > > anyway, to avoid guest changing it in between. So we do that and
> then
> > > use the copy everywhere, release the old one. Hmm?
> >
> > Yes. Old one use zerocopy, new one use copy data.
> >
> > Thanks
> > Shirley
>
> No, that's wrong, as they might become different with a
> malicious guest. As long as we copied already, lets realease
> the data and have everyone use the copy.

Ok, I will patch pskb_expand_head to test it out.

Shirley