netdev - Re: [PATCH net 2/5] ibmvnic: Fix MTU settings

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Message-Id: <783c7683-1cc2-6128-e19c-fd2c3c16cf4b@linux.vnet.ibm.com>
Date:   Thu, 26 Jan 2017 10:44:31 -0600
From:   Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, wvoigt@...ibm.com,
        jallen@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        nfont@...ux.vnet.ibm.com
Subject: Re: [PATCH net 2/5] ibmvnic: Fix MTU settings

On 01/25/2017 10:05 PM, David Miller wrote:
> From: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
> Date: Wed, 25 Jan 2017 15:02:20 -0600
>
>> In the current driver, the MTU is set to the maximum value
>> capable for the backing device. This patch sets the MTU to the
>> default value for a Linux net device.
> Why are you doing this?
>
> What happens to users who depend upon the current behavior.
>
> They will break, and that isn't acceptable.
>
The current behavior was already broken.  We were seeing firmware errors when sending jumbo sized packets .  We plan to add proper support for jumbo sized packets as soon as possible.