Re: [net-next PATCH v10 2/9] net: dsa: realtek: rtl8365mb: reject unsupported topologies

[Mieczyslaw Nalewaj]

On 5/30/2026 12:51 PM, Luiz Angelo Daros de Luca wrote:
> Explicitly enforce the presence of a CPU port (-EINVAL) and reject DSA
> cascade links (-EOPNOTSUPP) during setup to prevent silent failures.
> 
> These topologies were already non-functional. Without a CPU port, the
> driver does not activate CPU tagging. Additionally, the switch hardware
> was not designed to be cascaded, and DSA links never worked because
> CPU tagging is not enabled for them.
> 
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@xxxxxxxxx>
Reviewed-by: Mieczyslaw Nalewaj <namiltd@xxxxxxxxx>