netdev - Re: [PATCH v3 net-next 2/2] net: deprecate eth_change

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Message-ID: <20161017180027.4936fa15@jkicinski-Precision-T1700>
Date:   Mon, 17 Oct 2016 18:00:27 +0100
From:   Jakub Kicinski <kubakici@...pl>
To:     David Miller <davem@...emloft.net>
Cc:     jarod@...hat.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next 2/2] net: deprecate eth_change_mtu, remove
 usage

On Mon, 17 Oct 2016 12:49:54 -0400 (EDT), David Miller wrote:
> From: Jakub Kicinski <kubakici@...pl>
> Date: Mon, 17 Oct 2016 17:20:06 +0100
> 
> > Please correct me if I'm wrong but it seems like we are now limiting
> > _all_ ethernet drivers to ETH_DATA_LEN in net-next.  
> 
> No, because the driver can increase the netdev->max_mtu value as needed.

But since almost no driver is doing that, yet, right now in net-next
jumbo frames are not possible, no?  I thought the idea was the leave
the value at 0 so drivers can opt-in as needed but since setup_ether()
is initializing to 1500 now all ethernet driver get a default of
limiting to 1500.

IOW this patch made checks which were done only in eth_change_mtu()
mandatory for all drivers.