netdev - Re: [PATCH net] net: mvpp2: Enable autoneg bypass for 1000BaseX/2500BaseX ports

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Date:   Tue, 2 Jun 2020 10:08:26 +0200
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: mvpp2: Enable autoneg bypass for
 1000BaseX/2500BaseX ports

On Fri, 29 May 2020 18:33:40 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > > By propagated, you mean if the external link is down, the link between
> > > the switch and node 1 will also be forced down, at the SERDES level?
> > 
> > yes
> > 
> > > And if external ports are down, the nodes cannot talk to each other?
> > 
> > correct
> > 
> > > External link down causes the whole in box network to fall apart? That
> > > seems a rather odd design.
> > 
> > as I'm not an expert in ceph, I can't judge. But I'll bring it up.
> 
> I guess for a single use appliance this is O.K. But it makes the
> hardware unusable as a general purpose server.
> 
> Is there a variant of the hardware to be used as a general purpose
> server, rather than as a Ceph appliance? If so, does it share the same
> DT files?

I don't know of any, but it would just need some way to change the switch
configuration. So it's independent from linux running on the nodes.

Thomas.

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