netdev - Re: [PATCH net-next 1/3] ethtool: (uapi) Add ETHTOOL_PHY

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Date:   Mon, 28 Nov 2016 15:14:10 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Allan W. Nielsen" <allan.nielsen@...rosemi.com>
Cc:     netdev@...r.kernel.org, f.fainelli@...il.com,
        raju.lakkaraju@...rosemi.com
Subject: Re: [PATCH net-next 1/3] ethtool: (uapi) Add ETHTOOL_PHY_LOOPBACK to
 PHY tunables

On Mon, Nov 28, 2016 at 02:24:30PM +0100, Allan W. Nielsen wrote:
> From: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
> 
> 3 types of PHY loopback are supported.
> i.e. Near-End Loopback, Far-End Loopback and External Loopback.

Hi Allan

Is this integrated with ethtool --test? You only want the PHY to go
into loopback mode when running ethtool --test external_lb or maybe
ethtool --test offline.

What i think should happen is that this tunable sets the mode the PHY
will go into when loopback is enabled. It does not however enable
loopback. It is running ethtool --test which actually enables the
loopback, probably by setting BMCR_LOOPBACK. Once the test is
finished, the bit is cleared and the PHY goes back into normal
operation.

	Andrew