netdev - RE: [RFC PATCH v8 00/16] Provide a zero-copy method on KVM virtio-net.

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Date:	Fri, 30 Jul 2010 08:51:52 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Xin, Xiaohui" <xiaohui.xin@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mst@...hat.com" <mst@...hat.com>, "mingo@...e.hu" <mingo@...e.hu>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
	"jdike@...ux.intel.com" <jdike@...ux.intel.com>
Subject: RE: [RFC PATCH v8 00/16] Provide a zero-copy method on KVM
 virtio-net.

Hello Xiaohui,

On Fri, 2010-07-30 at 16:53 +0800, Xin, Xiaohui wrote:
> >Since vhost-net already supports macvtap/tun backends, do you think
> >whether it's better to implement zero copy in macvtap/tun than
> inducing
> >a new media passthrough device here?
> >
> 
> I'm not sure if there will be more duplicated code in the kernel. 

I think it should be less duplicated code in the kernel if we use
macvtap to support what media passthrough driver here. Since macvtap has
support virtio_net head and offloading already, the only missing func is
zero copy. Also QEMU supports macvtap, we just need add a zero copy flag
in option.

Thanks
Shirley

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