netdev - Re: [PATCH net] bonding: fix mii

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Message-ID: <2e184a78-c02a-4395-8e18-a72a8330db46@lunn.ch>
Date: Fri, 7 Nov 2025 18:32:37 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, Jay Vosburgh <jv@...sburgh.net>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Stanislav Fomichev <sdf@...ichev.me>, netdev@...r.kernel.org
Subject: Re: [PATCH net] bonding: fix mii_status when slave is down

> > I agree with your fix, but i would also like to know more about the
> > interfaces you are testing on. We should probably fix that device as
> > well. What is it?
> There is no bug. It is manually put down by one of our internal tests.

Are you sure?

admin down should cause the link to be dropped. You want the local
device to drop the carrier so the remote device knows you are gone,
etc. Also, dropping the carrier saves power. For a typical 1G copper
PHY, that is 1W. For a data centre connection, it can be many watts.

	Andrew