linux-kernel - Re: [PATCH v2 net] net: dsa: microchip: correct KSZ8795 static MAC table access

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Message-ID: <ZLJ6/ZkKk00AFPqi@corigine.com>
Date:   Sat, 15 Jul 2023 11:54:53 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Tristram.Ha@...rochip.com
Cc:     Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v2 net] net: dsa: microchip: correct KSZ8795 static MAC
 table access

On Thu, Jul 13, 2023 at 05:46:22PM -0700, Tristram.Ha@...rochip.com wrote:
> From: Tristram Ha <Tristram.Ha@...rochip.com>
> 
> The KSZ8795 driver code was modified to use on KSZ8863/73, which has
> different register definitions.  Some of the new KSZ8795 register
> information are wrong compared to previous code.
> 
> KSZ8795 also behaves differently in that the STATIC_MAC_TABLE_USE_FID
> and STATIC_MAC_TABLE_FID bits are off by 1 when doing MAC table reading
> than writing.  To compensate that a special code was added to shift the
> register value by 1 before applying those bits.  This is wrong when the
> code is running on KSZ8863, so this special code is only executed when
> KSZ8795 is detected.
> 
> Fixes: 4b20a07e103f ("net: dsa: microchip: ksz8795: add support for ksz88xx chips")
> Signed-off-by: Tristram Ha <Tristram.Ha@...rochip.com>
> Reviewed-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>