netdev - Re: [PATCH] net: r8169: convert to hw

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Date:	Fri, 08 Apr 2011 11:37:47 -0400
From:	David Dillow <dave@...dillows.org>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:	netdev@...r.kernel.org, Francois Romieu <romieu@...zoreil.com>
Subject: Re: [PATCH] net: r8169: convert to hw_features

On Fri, 2011-04-08 at 14:44 +0200, Michał Mirosław wrote:
> On Fri, Apr 08, 2011 at 02:38:46PM +0200, Michał Mirosław wrote:
> > This enables SG+IP_CSUM+TSO by default (there were no comments suggesting
> > leaving them out was intentional).
> > 
> > This also fixes confusion around vlan_features in rtl8169_vlan_mode().
> 
> BTW, I noticed that TSO will break for MTU > 4095+(TCP+IP header len).
> This needs handing in ndo_fix_features callback like other MTU-limited TSO
> engines.

I'd suggest leaving SG/CSUM/TSO off by default -- I played with getting
them working some time ago, and IIRC the current code doesn't handle all
devices properly. Add the issue you note above and you are knowingly
leaving landmines laying about for users of a popular piece of hardware.

Realtek, Francois, please correct me if I'm mistaken.

Dave

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