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([2a0d:3341:cc59:6510::f39]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-442d67d5c09sm164248635e9.7.2025.05.13.03.28.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 May 2025 03:28:02 -0700 (PDT) Message-ID: Date: Tue, 13 May 2025 12:28:00 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net] net: dsa: b53: prevent standalone from trying to forward to other ports To: Jonas Gorski , Florian Fainelli Cc: Florian Fainelli , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski , Andrew Lunn , "David S. Miller" , Eric Dumazet , Vladimir Oltean References: <20250508091424.26870-1-jonas.gorski@gmail.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20250508091424.26870-1-jonas.gorski@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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 @Florian, could you please have a look at this one, too? Thanks, Paolo