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Date:   Wed, 28 Sep 2022 09:59:14 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...io-technology.com
Cc:     Vladimir Oltean <olteanv@...il.com>, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <shuah@...nel.org>,
        Christian Marangi <ansuelsmth@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yuwei Wang <wangyuweihx@...il.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 net-next 6/6] selftests: forwarding: add test of
 MAC-Auth Bypass to locked port tests

Sorry for the delay, was away.

On Tue, Sep 27, 2022 at 10:33:10AM +0200, netdev@...io-technology.com wrote:
> On 2022-09-21 09:15, Ido Schimmel wrote:
> > 	bridge fdb add `mac_get $h2` dev br0 blackhole
> 
> To make this work, I think we need to change the concept, so that blackhole
> FDB entries are added to ports connected to the bridge, thus
>      bridge fdb add MAC dev $swpX master blackhole
> 
> This makes sense as the driver adds them based on the port where the SMAC is
> seen, even though the effect of the blackhole FDB entry is switch wide.

Asking user space to associate a blackhole entry with a bridge port does
not make sense to me because unlike regular entries, blackhole entries
do not forward packets out of this port. Blackhole routes and nexthops
are not associated with a device either.

> Adding them to the bridge (e.g. f.ex. br0) will not work in the SW bridge as
> the entries then are not found.

Why not found? This works:

 # bridge fdb add 00:11:22:33:44:55 dev br0 self local
 $ bridge fdb get 00:11:22:33:44:55 br br0
 00:11:22:33:44:55 dev br0 master br0 permanent

With blackhole support I expect:

 # bridge fdb add 00:11:22:33:44:55 dev br0 self local blackhole
 $ bridge fdb get 00:11:22:33:44:55 br br0
 00:11:22:33:44:55 dev br0 master br0 permanent blackhole

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