netdev - Re: [PATCH v2 16/16] skge: convert to hw

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Date:	Mon, 31 Jan 2011 23:40:32 +0100
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org, Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: [PATCH v2 16/16] skge: convert to hw_features

On Mon, Jan 31, 2011 at 10:53:43PM +0100, Michał Mirosław wrote:
> On Mon, Jan 31, 2011 at 08:45:02AM -0800, Stephen Hemminger wrote:
> > On Sat, 22 Jan 2011 23:14:14 +0100 (CET)
> > Michał Mirosław <mirq-linux@...e.qmqm.pl> wrote:
> > > The hardware might do full HW_CSUM, not just IP_CSUM, but it's not tested
> > > and so not changed here.
> > > Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> > The skge hardware does not do full HW_CSUM. It looks at the IP header.
> Driver code suggests otherwise. Please look at skge_xmit_frame() and TX
> descriptor format.
> 
> Besides, I'm locally using a patch that makes skge advertise HW_CSUM - TCP
> over IPv6 is correctly checksummed in hardware (haven't tried VLANs yet).

IPv4 UDP inside VLAN-tagged packet is also checksummed properly by hardware.
I don't have time now to make a proper HW_CSUM test (with arbitrary header
prepended). If someone has one (or patches?), I'd be glad to use it, though.

Best Regards,
Michał Mirosław
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