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

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Message-ID: <YRMC3zWIlIPeK2NB@lunn.ch>
Date:   Wed, 11 Aug 2021 00:51:11 +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

> The patch is well defined but it doesn't provide user with the answer
> to the question "why is the SFP still up if I asked it to be down?"

Can the user even see that the SFP is still up? Does ip link show
give:

3: eth42: <BROADCAST,MULTICAST,LOWER_UP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000

i.e. LOWER_UP despite DOWN?

Roopa added:

    rtnetlink: add support for protodown reason

Maybe we need the opposite as well?

      Andrew