Re: Fix for kern/20700

[David Young <dyoung%pobox.com@localhost>]

On Sun, Dec 04, 2011 at 06:51:42PM +0100, Manuel Bouyer wrote:
> On Thu, Dec 01, 2011 at 09:32:53PM +0000, David Laight wrote:
> > [...]
> > 
> > At a guess it isn't setting the ANAR (autonegotiate advertise register)
> > correctly.
> > 
> > I've long been an advocate of constraining the 'media' by limiting
> > the ANAR values - rather then fixing the mode.
> > IIRC the ANAR register is one of the standard 8 registers (if the
> > original definition has enough bits for Ge and 10Ge).
> 
> There are cases where we need to fix the mode and not use autoneg.
> E.g. early 100Mbs cisco devices didn't negotiate properly, the only
> way to get things working properly was to force media on both ends.
> 
> If we only set the ANAR negotiation may still be failing.
> Maybe we should introduce new media types or options to specify
> if we want fixed media with or without autoneg ?

You mean something like 'mediaopt no-negot' for those links where the
peer doesn't negotiate properly?  Makes sense to me....

Dave

-- 
David Young
dyoung%pobox.com@localhost    Urbana, IL    (217) 721-9981