From: "James Harper" <james.harper@bendigoit.com.au>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel@lists.xensource.com
Subject: RE: tcp offload with ip or tcp options
Date: Thu, 12 May 2011 22:19:28 +1000 [thread overview]
Message-ID: <AEC6C66638C05B468B556EA548C1A77D01D56FEF@trantor> (raw)
In-Reply-To: <1305202697.26692.490.camel@zakaz.uk.xensource.com>
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> 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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prev parent reply other threads:[~2011-05-12 12:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-12 12:08 tcp offload with ip or tcp options James Harper
2011-05-12 12:18 ` Ian Campbell
2011-05-12 12:19 ` James Harper [this message]
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