netdev - Re: [PATCH net v3 1/2] rtnetlink: allow to set iface down before enslaving it

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Date: Sat, 6 Jan 2024 12:08:00 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Phil Sutter <phil@....cc>, Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH net v3 1/2] rtnetlink: allow to set iface down before
 enslaving it

Sat, Jan 06, 2024 at 04:32:12AM CET, phil@....cc wrote:
>Hi,
>
>On Fri, Jan 05, 2024 at 12:59:24PM +0100, Jiri Pirko wrote:
>> Thu, Jan 04, 2024 at 05:42:59PM CET, nicolas.dichtel@...nd.com wrote:
>> >The below commit adds support for:
>> >> ip link set dummy0 down
>> >> ip link set dummy0 master bond0 up
>> >
>> >but breaks the opposite:
>> >> ip link set dummy0 up
>> >> ip link set dummy0 master bond0 down
>> 
>> It is a bit weird to see these 2 and assume some ordering.
>> The first one assumes:
>> dummy0 master bond 0, dummy0 up
>> The second one assumes:
>> dummy0 down, dummy0 master bond 0
>> But why?
>> 
>> What is the practival reason for a4abfa627c38 existence? I mean,
>> bond/team bring up the device themselfs when needed. Phil?
>> Wouldn't simple revert do better job here?
>
>Ah, I wasn't aware bond master manipulates slaves' links itself and thus
>treated all types' link master setting the same by setting the slave up
>afterwards. This is basically what a4abfa627c38 is good for: Enabling
>'ip link set X master Y up' regardless of Y's link type.
>
>If setting a bond slave up manually is not recommended, the easiest
>solution is probbaly indeed to revert a4abfa627c38 and live with the
>quirk in bond driver.

Okay, lets revert then.

>
>Cheers, Phil