netdev - RE: [PATCH net-next v4 2/5] xen-netback: add support for IPv6 checksum offload from guest

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Date:	Mon, 14 Oct 2013 10:49:20 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>
CC:	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Wei Liu <wei.liu2@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: RE: [PATCH net-next v4 2/5] xen-netback: add support for IPv6
 checksum offload from guest

> -----Original Message-----
> From: Wei Liu [mailto:wei.liu2@...rix.com]
> Sent: 14 October 2013 11:43
> To: Paul Durrant
> Cc: xen-devel@...ts.xen.org; netdev@...r.kernel.org; Wei Liu; David Vrabel;
> Ian Campbell
> Subject: Re: [PATCH net-next v4 2/5] xen-netback: add support for IPv6
> checksum offload from guest
> 
> On Fri, Oct 11, 2013 at 04:06:19PM +0100, Paul Durrant wrote:
> [...]
> > -/*
> > - * This is the amount of packet we copy rather than map, so that the
> > - * guest can't fiddle with the contents of the headers while we do
> > - * packet processing on them (netfilter, routing, etc).
> > +/* This is a miniumum size for the linear area to avoid lots of
> > + * calls to __pskb_pull_tail() as we set up checksum offsets.
> >   */
> 
> You seem to forget to explain why 128 is chosen. :-)

Is that not sufficient explanation? What sort of thing are you looking for?

  Paul
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