linux-kernel - Query regarding Phy loopback support

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Message-ID: <aMlHoBWqe8YOwnv8@test-OptiPlex-Tower-Plus-7010>
Date: Tue, 16 Sep 2025 16:48:56 +0530
From: Hariprasad Kelam <hkelam@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kuba@...nel.org>, <davem@...emloft.net>, <sgoutham@...vell.com>,
        <gakula@...vell.com>, <sbhatta@...vell.com>, <naveenm@...vell.com>,
        <edumazet@...gle.com>, <pabeni@...hat.com>, <andrew+netdev@...n.ch>,
        <bbhushan2@...vell.com>
Subject: Query regarding Phy loopback support

We're looking for a standard way to configure PHY loopback on a network 
interface using common Linux tools like ethtool, ip, or devlink.

Currently, ethtool -k eth0 loopback on enables a generic loopback, but it 
doesn't specify if it's an internal, external, or PHY loopback. 
Need suggestions to implement this feature in a standard way.