netdev - Re: [Xen-devel] [RFC PATCH V3 15/16] netfront: multi page ring support.

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Message-ID: <1328008540.5553.79.camel@leeds.uk.xensource.com>
Date:	Tue, 31 Jan 2012 11:15:40 +0000
From:	Wei Liu <wei.liu2@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	<wei.liu2@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [Xen-devel] [RFC PATCH V3 15/16] netfront: multi page ring
 support.

On Tue, 2012-01-31 at 09:53 +0000, Jan Beulich wrote:
> > with more than 4GB?
> 
> Imo the use of the DMA API is a mistake here anyway. There's no need
> for anything to be contiguous in a PV frontend/backend handshake
> protocol, or if one finds there is it's very likely just because of trying to
> avoid doing something properly.
> 

Seems you're right. I look at the backend code again, I make use of 
vm_struct to create a contiguous area in backend kernel. In fact I can
avoid DMA API completely. ;-)


Wei.

> Jan
> 


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