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RE: [Xen-devel] tcp offload with ip or tcp options

from [James Harper]

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To:	"Ian Campbell" <Ian.Campbell@xxxxxxxxxx>
Subject:	RE: [Xen-devel] tcp offload with ip or tcp options
From:	"James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date:	Thu, 12 May 2011 22:19:28 +1000
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Thread-topic:	[Xen-devel] tcp offload with ip or tcp options

> On Thu, 2011-05-12 at 13:08 +0100, James Harper wrote:
> > Is TCP LSO and/or checksum offload supported when IP or TCP options are
> > present in the packet? Or is that dependent on the underlying hardware
> > (for which there is no way to indicate to DomU I think)
> 
> I think it ought to work.
> 
> Until recently Linux netback might not have included enough bytes in the
> Linux part of an SKB to cover TCP/IP headers including options. That's
> fixed in xen/stable-2.6.32.x though via 0cbb2dd6d518 and it was fixed
> already in the version which went upstream in 2.6.39. I don't know how
> versions before that actually behave in practice though.
> 

Thanks. I guess I'll find out shortly :)

James

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