netdev - Re: [PATCH] net: EMAC: Fix problem with mtu > 4080 on non TAH equipped 4xx PPC's

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Date:	Tue, 15 Jan 2008 20:46:01 +0100
From:	Stefan Roese <sr@...x.de>
To:	Eugene Surovegin <ebs@...home.net>
Cc:	linuxppc-dev@...abs.org, netdev@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [PATCH] net: EMAC: Fix problem with mtu > 4080 on non TAH  equipped 4xx PPC's

On Tuesday 15 January 2008, Eugene Surovegin wrote:
> On Tue, Jan 15, 2008 at 01:40:09PM +0100, Stefan Roese wrote:
> > Currently, all non TAH equipped 4xx PPC's call emac_start_xmit() upon
> > xmit. This routine doesn't check if the frame length exceeds the max.
> > MAL buffer size.
> >
> > This patch now changes the driver to call emac_start_xmit_sg() on all
> > platforms and not only the TAH equipped ones (440GX). This enables an
> > MTU of 9000 instead 4080.
> >
> > Tested on Kilauea (405EX) with gbit link -> jumbo frames enabled.
> >
> > Signed-off-by: Stefan Roese <sr@...x.de>
> > ---
> > Eugene & Ben, do you see any problems with this patch? If not, then I'll
> > send another version for the newemac driver too.
>
> Hmm, so why not make GigE support a condition to hook SG version of
> xmit then? I don't like when you change behaviour for chips where it
> perefectly legal not to do this check because you cannot change MTU
> anyways.

OK. But how do we detect GigE support? Seems like GigE enabled devices have 
CONFIG_IBM_EMAC4 defined. If nobody objects I'll fix up another version 
tomorrow.

Thanks.

Best regards,
Stefan
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