From: Eric Dumazet
> Sent: 04 December 2018 17:04
>
> On 12/04/2018 08:59 AM, David Laight wrote:
> > From: Tariq Toukan
> >> Sent: 02 December 2018 12:35
> >> From: Eran Ben Elisha <era...@mellanox.com>
> >>
> >> NIC driver minimal MTU size shall be set to ETH_MIN_MTU, as defined in
> >> the RFC791 and in the network stack. Remove old mlx4_en only define for
> >> it, which was set to wrong value.
> > ...
> >>
> >> - /* MTU range: 46 - hw-specific max */
> >> - dev->min_mtu = MLX4_EN_MIN_MTU;
> >> + /* MTU range: 68 - hw-specific max */
> >> + dev->min_mtu = ETH_MIN_MTU;
> >> dev->max_mtu = priv->max_mtu;
> >
> > Where does 68 come from?
>
> Min IPv4 MTU per RFC791
Which has nothing to do with an ethernet driver.
Indeed, IIRC, it is the smallest maximum frame size that IPv4
can work over.
David
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