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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Florian Fainelli , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net] net: dsa: b53: prevent standalone from trying to forward to other ports Message-ID: <20250513125516.bsgf7b3jsrcfq4oq@skbuf> References: <20250508091424.26870-1-jonas.gorski@gmail.com> <20250508091424.26870-1-jonas.gorski@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250508091424.26870-1-jonas.gorski@gmail.com> <20250508091424.26870-1-jonas.gorski@gmail.com> On Thu, May 08, 2025 at 11:14:24AM +0200, 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 > --- Reviewed-by: Vladimir Oltean