linux-kernel - Re: [RFC][PATCH v3 1/3] A device for zero-copy based on KVM virtio-net.

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Message-ID: <20100415090324.GA15135@redhat.com>
Date:	Thu, 15 Apr 2010 12:03:24 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Xin, Xiaohui" <xiaohui.xin@...el.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"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>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"jdike@...ux.intel.com" <jdike@...ux.intel.com>
Subject: Re: [RFC][PATCH v3 1/3] A device for zero-copy based on KVM
	virtio-net.

On Thu, Apr 15, 2010 at 05:01:10PM +0800, Xin, Xiaohui wrote:
> >It smells like a layering violation to look at the iocb->private field
> >from a lower-level driver. I would have hoped that it's possible to implement
> >this without having this driver know about the higher-level vhost driver
> >internals. Can you explain why this is needed?
> 
> I don't like this too, but since the kiocb is maintained by vhost with a list_head.
> And mp device is responsible to collect the kiocb into the list_head,
> We need something known by vhost/mp both.

Can't vhost supply a kiocb completion callback that will handle the list?

-- 
MST
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