[PATCH net-next v2] net: airoha: add ethtool priv_flags support for LAN/WAN and GDM2 loopback

[Andrew Lunn]

On Sun, Jun 07, 2026 at 08:07:37PM +0200, Lorenzo Bianconi wrote:
> > > When a GDM3/GDM4 port is set to WAN mode, enable GDM2 loopback to
> > > support hardware QoS. Conversely, when switching back to LAN mode,
> > > disable the GDM2 loopback and restore the default forwarding
> > > configuration.
> > 
> > Why not just use the presence of an off loadable qdisc as the
> > indicator to change mode?
> 
> Hi Andrew,
> 
> Interesting, can you please provide more details about you mean?

You say you need it to be in loopback mode in order to support
hardware QoS. You configure QoS by using a qdisc, and something like
mqprio, tcf etc. So when the user configures QoS, you can see if the
hardware supports the request QoS. If so, swap to loopback mode and
offload the QoS function to the hardware. If the hardware does not
support the requested QoS, leave it in software and keep with LAN
mode.

	Andrew