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

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Message-ID: <bf8366de-107f-4204-bd96-31f8dd8114fc@6wind.com>
Date: Fri, 7 Nov 2025 19:45:44 +0100
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: Andrew Lunn <andrew@...n.ch>
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

Le 07/11/2025 à 18:32, Andrew Lunn a écrit :
>>> 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?
Hmm, ok ok.

> 
> 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.
It's a virtual interface, a tuntap.

Nicolas