netdev - Re: [PATCH net-next 0/2] Fix MTU warnings for fec/mv886xxx combo

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Message-ID: <20200711224838.GA1110701@lunn.ch>
Date:   Sun, 12 Jul 2020 00:48:38 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Chris Healy <cphealy@...il.com>,
        Fugang Duan <fugang.duan@....com>
Subject: Re: [PATCH net-next 0/2] Fix MTU warnings for fec/mv886xxx combo

On Sat, Jul 11, 2020 at 10:26:18PM +0100, Russell King - ARM Linux admin wrote:
> On Sat, Jul 11, 2020 at 10:32:04PM +0200, Andrew Lunn wrote:
> > Since changing the MTU of dsa slave interfaces was implemented, the
> > fec/mv88e6xxx combo has been giving warnings:
> > 
> > [    2.275925] mv88e6085 0.2:00: nonfatal error -95 setting MTU on port 9
> > [    2.284306] eth1: mtu greater than device maximum
> > [    2.287759] fec 400d1000.ethernet eth1: error -22 setting MTU to include DSA overhead
> > 
> > This patchset adds support for changing the MTU on mv88e6xxx switches,
> > which do support jumbo frames. And it modifies the FEC driver to
> > support its true MTU range, which is larger than the default Ethernet
> > MTU.
> 
> It's not just the fec/mv88e6xxx combo - I've been getting them on
> Clearfog too.  It just hasn't been important enough to report yet.

Hi Russell

That is the combination i have tested. mvneta has support for changing
its MTU. So this should stop the warnings on clearfog as well.

    Andrew