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

From: Michael S. Tsirkin
Date: Tue May 17 2011 - 02:21:55 EST

On Mon, May 16, 2011 at 04:32:18PM -0700, Shirley Ma wrote:
> 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?
> Thanks
> Shirley

Problem is, in your patch there are a set of restrictions on what the
device can do with the skb that we need to enforce somehow.
Also, how do we know it's a 'real NIC' and not a software device?

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