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

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Message-ID: <aea8db43-e8d7-4cbf-b445-aa9b8be64708@redhat.com>
Date: Tue, 13 May 2025 12:28:00 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Jonas Gorski <jonas.gorski@...il.com>,
 Florian Fainelli <florian.fainelli@...adcom.com>
Cc: Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
 Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH net] net: dsa: b53: prevent standalone from trying to
 forward to other ports

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@...il.com>

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

Thanks,

Paolo