netdev - Re: How to toggle physical link via ethtool

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Message-ID: <CA+sq2Cfo4cWGO9buf7uKJrn1SuZF9USFTc4VeQUpus=0cGmUNA@mail.gmail.com>
Date:   Fri, 23 Apr 2021 23:57:45 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Linux Netdev List <netdev@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Sunil Goutham <sgoutham@...vell.com>
Subject: Re: How to toggle physical link via ethtool

On Wed, Apr 21, 2021 at 11:00 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Wed, 21 Apr 2021 18:12:16 +0530 Sunil Kovvuri wrote:
> > 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.
>
> How VFs operate is really implementation specific, so it'd be
> interesting to hear from the vendors but IIUC bringing PF down
> should shut down the link.
>
> What usually keeps the link up is stuff like NC-SI, but not VFs.
>
Okay.

Thanks,
Sunil.