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

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Date:	Tue, 17 May 2011 09:21:11 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 2/6 net-next] netdevice.h: Add zero-copy flag in
 netdevice

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?

-- 
MST
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