netdev - Re: [RFC net-next PATCH 0/3] net: dsa: mv88e6xxx: Add RMU support

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Date:   Thu, 18 Aug 2022 14:58:36 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Mattias Forsblad <mattias.forsblad@...il.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        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>
Subject: Re: [RFC net-next PATCH 0/3] net: dsa: mv88e6xxx: Add RMU support

On Thu, Aug 18, 2022 at 12:29:21PM +0200, Mattias Forsblad wrote:
> The Marvell SOHO switches have the ability to receive and transmit
> Remote Management Frames (Frame2Reg) to the CPU through the
> switch attached network interface.
> These frames is handled by the Remote Management Unit (RMU) in
> the switch.
> These frames can contain different payloads:
> single switch register read and writes, daisy chained switch
> register read and writes, RMON/MIB dump/dump clear and ATU dump.
> The dump functions are very costly over MDIO but it's
> only a couple of network packets via the RMU. Handling these
> operations via RMU instead of MDIO also relieves access
> contention on the MDIO bus.
>
> This request for comment series implements RMU layer 2 and
> layer 3 handling and also collecting RMON counters
> through the RMU.
>
> Next step could be to implement single read and writes but we've
> found that the gain to transfer this to RMU is neglible.
>
> Regards,
> Mattias Forsblad

Have you seen how things work with qca8k_connect_tag_protocol()/
qca8k_master_change()/qca8k_read_eth()/qca8k_write_eth()/
qca8k_phy_eth_command()?