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Date:   Tue, 19 Feb 2019 14:04:44 -0500
From:   Vivien Didelot <>
To:     Russell King - ARM Linux admin <>
Cc:     Andrew Lunn <>,
        Florian Fainelli <>,
        Heiner Kallweit <>,
        "David S. Miller" <>,
Subject: Re: [PATCH net-next v2 2/3] net: dsa: mv88e6xxx: add support for
 bridge flags

Hi Russell,

On Tue, 19 Feb 2019 18:08:11 +0000, Russell King - ARM Linux admin <> wrote:
> Having these as separate functions means that we would then need
> additional complexity in mv88e6xxx to store the per-port flooding state,
> so we can do this:
>         reg &= ~MV88E6352_PORT_CTL0_EGRESS_FLOODS_MASK;
>         if (unicast && multicast)
>                 reg |= MV88E6352_PORT_CTL0_EGRESS_FLOODS_ALL_UNKNOWN_DA;
>         else if (unicast)
>                 reg |= MV88E6352_PORT_CTL0_EGRESS_FLOODS_NO_UNKNOWN_MC_DA;
>         else if (multicast)
>                 reg |= MV88E6352_PORT_CTL0_EGRESS_FLOODS_NO_UNKNOWN_UC_DA;
>         else
>                 reg |= MV88E6352_PORT_CTL0_EGRESS_FLOODS_NO_UNKNOWN_DA;
> for some of the switches.  It looks to me like mv88e6xxx would prefer
> having at least both the unicast and multicast flags together.
> Even without that, it means more code in mv88e6xxx to wrap each of
> these calls between the DSA ops and the chip specific ops...

True, let's stick with ops->port_egress_flood(ds, port, bool uc, bool mc).
I do not think that it is necessary to add support for BR_BCAST_FLOOD yet,
we can extend this routine later if we need to.

Your dsa_port_bridge_flags() core function can notify the understood
features. This will allow us to scope the support of the bridge flags in
the core, and preventing the drivers to do that themselves.



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