linux-kernel - Re: [PATCH] net: dsa: lan9303: allow vid != 0 in port_fdb

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Date:   Wed, 31 May 2023 18:16:20 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     "A. Sverdlin" <alexander.sverdlin@...mens.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org,
        Egil Hjelmeland <privat@...l-hjelmeland.no>
Subject: Re: [PATCH] net: dsa: lan9303: allow vid != 0 in port_fdb_{add|del}
 methods

On Wed, May 31, 2023 at 04:38:26PM +0200, A. Sverdlin wrote:
> From: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> 
> LAN9303 doesn't associate FDB (ALR) entries with VLANs, it has just one
> global Address Logic Resolution table [1].
> 
> Ignore VID in port_fdb_{add|del} methods, go on with the global table. This
> is the same semantics as hellcreek or RZ/N1 implement.
> 
> Visible symptoms:
> LAN9303_MDIO 5b050000.ethernet-1:00: port 2 failed to delete 00:xx:xx:xx:xx:cf vid 1 from fdb: -2
> LAN9303_MDIO 5b050000.ethernet-1:00: port 2 failed to add 00:xx:xx:xx:xx:cf vid 1 to fdb: -95
> 
> [1] https://ww1.microchip.com/downloads/en/DeviceDoc/00002308A.pdf
> 
> Fixes: 0620427ea0d6 ("net: dsa: lan9303: Add fdb/mdb manipulation")
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> ---

Thanks for taking a look. Although it would probably be safer to add:

Fixes: 2fd186501b1c ("net: dsa: be louder when a non-legacy FDB operation fails")

since I'm not sure it has a reason to be backported beyond that. Anyway:

Reviewed-by: Vladimir Oltean <olteanv@...il.com>

Yuck.