netdev - Re: [PATCH net-next 1/2] net: dsa: mv88e6xxx: Implement MTU change

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Date:   Sun, 12 Jul 2020 01:52:35 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Behun <marek.behun@....cz>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Chris Healy <cphealy@...il.com>,
        Fugang Duan <fugang.duan@....com>
Subject: Re: [PATCH net-next 1/2] net: dsa: mv88e6xxx: Implement MTU change

On Sun, Jul 12, 2020 at 01:29:44AM +0200, Marek Behun wrote:
> On Sat, 11 Jul 2020 22:32:05 +0200
> Andrew Lunn <andrew@...n.ch> wrote:
> 
> > The Marvell Switches support jumbo packages. So implement the
> > callbacks needed for changing the MTU.
> > 
> > Signed-off-by: Andrew Lunn <andrew@...n.ch>
> 
> Hi Andrew,
> 
> maybe this could be sent to net, not only net-next. Or maybe even
> better, with a Fixes tag to some commit - DSA now prints warnings on
> some systems when initializing switch interfaces, that MTU cannot be
> changed, so maybe we could look at this patch as a fix and get it
> backported...

Hi Marek

It does not really 'fix' anything. The warning clearly says it is nonfatal

[    2.091447] mv88e6085 0.1:00: nonfatal error -95 setting MTU on port 1
[    2.123378] mv88e6085 0.1:00: nonfatal error -95 setting MTU on port 2
[    2.144035] mv88e6085 0.1:00: nonfatal error -95 setting MTU on port 3
[    2.165546] mv88e6085 0.1:00: nonfatal error -95 setting MTU on port 4
[    2.189840] mv88e6085 0.2:00: nonfatal error -95 setting MTU on port 1
[    2.213373] mv88e6085 0.2:00: nonfatal error -95 setting MTU on port 2
[    2.232762] mv88e6085 0.2:00: nonfatal error -95 setting MTU on port 3
[    2.253840] mv88e6085 0.2:00: nonfatal error -95 setting MTU on port 4
[    2.275925] mv88e6085 0.2:00: nonfatal error -95 setting MTU on port 9

and the switch works as before. As such, i don't think this patch
meets the requirements of stable:

Documentation/process/stable-kernel-rules.rst

	Andrew