netdev - Re: [RFC PATCH net-next 1/8] ethtool: Add ability to control transceiver modules' low power mode

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Message-ID: <YRQ5y65CVgaPJkdB@lunn.ch>
Date:   Wed, 11 Aug 2021 22:57:47 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Ido Schimmel <idosch@...sch.org>,
        "Keller, Jacob E" <jacob.e.keller@...el.com>,
        netdev@...r.kernel.org, davem@...emloft.net, mkubecek@...e.cz,
        pali@...nel.org, vadimp@...dia.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [RFC PATCH net-next 1/8] ethtool: Add ability to control
 transceiver modules' low power mode

> Isn't the "low-power" attr just duplicating the relevant bits from -m?

Do all SFPs report it in the dump? I'm thinking GPON, 1G modules with
a TX_ENABLE pin? INF-8074 does not specify a bit in the 'EEPROM' data
to indicate the status. So you need to know the state of the GPIO
driving the TX_ENABLE pin.

   Andrew