netdev - Re: [PATCH net-next] net: dsa: hellcreek: Offload bridge port flags

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Date:   Mon, 15 Mar 2021 21:33:44 +0100
From:   Kurt Kanzenbach <kurt@...-computers.de>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: dsa: hellcreek: Offload bridge port flags

On Mon Mar 15 2021, Vladimir Oltean wrote:
> On Sun, Mar 14, 2021 at 01:52:08PM +0100, Kurt Kanzenbach wrote:
>> +	if (enable)
>> +		val &= ~HR_PTCFG_UUC_FLT;
>> +	else
>> +		val |= HR_PTCFG_UUC_FLT;
>
> What does 'unknown unicast filtering' mean/do, exactly?
> The semantics of BR_FLOOD are on egress: all unicast packets with an
> unknown destination that are received on ports from this bridging domain
> can be flooded towards port X if that port has flooding enabled.
> When I hear "filtering", I imagine an ingress setting, am I wrong?

It means that frames without matching fdb entries towards this port are
discarded. There's also ingress filtering which works based on VLANs and
is used already.

Thanks,
Kurt

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