Re: [PATCH net] net: dsa: b53: prevent standalone from trying to forward to other ports

[Paolo Abeni <pabeni@redhat.com>]

On 5/8/25 11:14 AM, Jonas Gorski wrote:
> When bridged ports and standalone ports share a VLAN, e.g. via VLAN
> uppers, or untagged traffic with a vlan unaware bridge, the ASIC will
> still try to forward traffic to known FDB entries on standalone ports.
> But since the port VLAN masks prevent forwarding to bridged ports, this
> traffic will be dropped.
> 
> This e.g. can be observed in the bridge_vlan_unaware ping tests, where
> this breaks pinging with learning on.
> 
> Work around this by enabling the simplified EAP mode on switches
> supporting it for standalone ports, which causes the ASIC to redirect
> traffic of unknown source MAC addresses to the CPU port.
> 
> Since standalone ports do not learn, there are no known source MAC
> addresses, so effectively this redirects all incoming traffic to the CPU
> port.
> 
> Fixes: ff39c2d68679 ("net: dsa: b53: Add bridge support")
> Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

@Florian, could you please have a look at this one, too?

Thanks,

Paolo