netdev - How to toggle physical link via ethtool

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Message-ID: <CA+sq2Ce+AW3HUhqxa2Q9+2G0BGTnjuzLdnLLBVfeY=_0s6dANQ@mail.gmail.com>
Date:   Wed, 21 Apr 2021 18:12:16 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Linux Netdev List <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>
Cc:     Sunil Goutham <sgoutham@...vell.com>
Subject: How to toggle physical link via ethtool

Hi,

Have a query on how to bring down physical link (serdes) for a NIC interface.

I am under assumption that for a SR-IOV NIC, when user executes
"ifconfig eth-pf down",
it should not bring down physical link as there could be virtual
interfaces still active.
Let me know if this assumption itself is wrong.

If the assumption is correct and if user wants to intentionally bring
down physical link for
whatever reasons, then I do not see a way to do this. There are no
commands either in
'ethtool' or 'ip link' to achieve this.

Would it be okay to add a ethtool command similar to 'ethtool
--identify" to toggle physical link.

Thanks,
Sunil.