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Date:   Thu, 21 Apr 2022 16:20:59 -0700
From:   Florian Fainelli <>
To:     Vladimir Oltean <>,
Cc:     Jakub Kicinski <>,
        "David S. Miller" <>,
        Paolo Abeni <>, Andrew Lunn <>,
        Vivien Didelot <>,
        Vladimir Oltean <>
Subject: Re: [PATCH net] net: dsa: flood multicast to CPU when slave has

On 4/21/22 15:42, Vladimir Oltean wrote:
> Certain DSA switches can eliminate flooding to the CPU when none of the
> ports have the IFF_ALLMULTI or IFF_PROMISC flags set. This is done by
> synthesizing a call to dsa_port_bridge_flags() for the CPU port, a call
> which normally comes from the bridge driver via switchdev.
> The bridge port flags and IFF_PROMISC|IFF_ALLMULTI have slightly
> different semantics, and due to inattention/lack of proper testing, the
> IFF_PROMISC flag allows unknown unicast to be flooded to the CPU, but
> not unknown multicast.
> This must be fixed by setting both BR_FLOOD (unicast) and BR_MCAST_FLOOD
> in the synthesized dsa_port_bridge_flags() call, since IFF_PROMISC means
> that packets should not be filtered regardless of their MAC DA.
> Fixes: 7569459a52c9 ("net: dsa: manage flooding on the CPU ports")
> Signed-off-by: Vladimir Oltean <>

Reviewed-by: Florian Fainelli <>

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