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Date:   Tue, 12 May 2020 02:52:25 +0300
From:   Vladimir Oltean <>
To:     Florian Fainelli <>
Cc:     Andrew Lunn <>,
        Vivien Didelot <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        netdev <>
Subject: Re: [PATCH net-next 0/4] DSA: promisc on master, generic flow
 dissector code

On Tue, 12 May 2020 at 02:28, Florian Fainelli <> wrote:
> On 5/11/2020 1:20 PM, Vladimir Oltean wrote:
> > From: Vladimir Oltean <>
> >
> > The initial purpose of this series was to implement the .flow_dissect
> > method for sja1105 and for ocelot/felix. But on Felix this posed a
> > problem, as the DSA headers were of different lengths on RX and on TX.
> > A better solution than to just increase the smaller one was to also try
> > to shrink the larger one, but in turn that required the DSA master to be
> > put in promiscuous mode (which sja1105 also needed, for other reasons).
> >
> > Finally, we can add the missing .flow_dissect methods to ocelot and
> > sja1105 (as well as generalize the formula to other taggers as well).
> On a separate note, do you have any systems for which it would be
> desirable that the DSA standalone port implemented receive filtering? On
> BCM7278 devices, the Ethernet MAC connected to the switch is always in
> promiscuous mode, and so we rely on the switch not to flood the CPU port
> unnecessarily with MC traffic (if nothing else), this is currently
> implemented in our downstream kernel, but has not made it upstream yet,
> previous attempt was here:
> I would like to revisit that at some point.
> --
> Florian

Yes, CPU filtering of traffic (not just multicast) is one of the
problems we're facing. I'll take a look at your patches and maybe I'll
pick them up.


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