Re: [PATCH net] net: vlan: allow vlan device MTU change follow real device from smaller to bigger

[Stephen Hemminger]

On Wed, 23 Feb 2022 08:03:42 -0800
Jakub Kicinski <kuba@xxxxxxxxxx> wrote:

> On Wed, 23 Feb 2022 12:26:18 +0100 Guillaume Nault wrote:
> > Do you mean something like:
> > 
> >   ip link set dev eth0 vlan-mtu-policy <policy-name>
> > 
> > that'd affect all existing (and future) vlans of eth0?  
> 
> I meant
> 
>   ip link set dev vlan0 mtu-policy blah
> 
> but also
> 
>   ip link set dev bond0 mtu-policy blah
> 
> and
> 
>   ip link set dev macsec0 mtu-policy blah2
>   ip link set dev vxlan0 mtu-policy blah2

Sorry, putting this in ip link is not the right place.
It belongs in sysctl (if at all); not convinced this is worth doing.