netdev - Re: [PATCH] net: core: Fix to store new mtu setting in netdevice.

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Date:   Wed, 2 Jan 2019 00:36:08 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        Murali Krishna Policharla <murali.policharla@...adcom.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "amritha.nambiar@...el.com" <amritha.nambiar@...el.com>,
        "ecree@...arflare.com" <ecree@...arflare.com>,
        "alexander.h.duyck@...el.com" <alexander.h.duyck@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: core: Fix to store new mtu setting in netdevice.

> > Is there a .ndo_change_mtu callback, which does not assign a new mtu itself?
> > 
> So far all drivers have to do it themselves. But IMO this is more a workaround
> for the core not doing it. It's something the core should do.
> Now we can remove this from drivers.

Hi Heiner

I think somebody first needs to review all the ndo_change_mtu
implementations and check that none do something funny like round to
multiple of 2 or 4 to satisfy DMA restrictions, etc. If there is such
a thing, we cannot easily move this into the core.

    Andrew