linux-kernel - Re: [net-next PATCH v9 3/4] net: dsa: Add Airoha AN8855 5-Port Gigabit DSA Switch driver

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Message-ID: <6751e22d.050a0220.3435c6.57de@mx.google.com>
Date: Thu, 5 Dec 2024 18:26:01 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	upstream@...oha.com
Subject: Re: [net-next PATCH v9 3/4] net: dsa: Add Airoha AN8855 5-Port
 Gigabit DSA Switch driver

On Thu, Dec 05, 2024 at 07:06:29PM +0200, Vladimir Oltean wrote:
> On Thu, Dec 05, 2024 at 03:51:33PM +0100, Christian Marangi wrote:
> > +	.port_fdb_add = an8855_port_fdb_add,
> > +	.port_fdb_del = an8855_port_fdb_del,
> > +	.port_fdb_dump = an8855_port_fdb_dump,
> > +	.port_mdb_add = an8855_port_mdb_add,
> > +	.port_mdb_del = an8855_port_mdb_del,
> 
> Please handle the "struct dsa_db" argument of these functions, so that
> you can turn on ds->fdb_isolation. It is likely that instead of a single
> AN8855_FID_BRIDGED, there needs to be a unique FID allocated for each
> VLAN-unaware bridge in order for their FDBs to be isolated from each
> other, and so that the same MAC address could live under both bridges.

Mh ok, I hoped we could first have the base DSA driver merged before
starting to applying these kind of feature.

Concept looks handy, ideally I can just assign one ID for each port
like:
port 1 -> FIB 1
port 2 -> FIB 1
port 3 -> FIB 2

Question:
Ports of the same bridge should have the same FIB?

What I need to check is how the switch handle this for learning. Does
the switch correctly create FDB entry with the right FIB? If that's not
the case then I think assisted_learning is needed and HW Learn can't be
used?

(I still need to check if I can assign a default FIB for a port...
Currently the STP register are 2 bit for each FIB id, so 16 different
FIB are possible)

Also do we have a script for selft tests? I remember there was one back
in the days for fdb isolation?

-- 
	Ansuel