netdev - Re: [PATCH net-next 5/6] netlink: add mask validation

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Date:   Mon, 05 Oct 2020 21:37:06 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kernel-team@...com,
        jiri@...nulli.us, andrew@...n.ch, mkubecek@...e.cz,
        dsahern@...il.com, pablo@...filter.org
Subject: Re: [PATCH net-next 5/6] netlink: add mask validation

On Mon, 2020-10-05 at 12:34 -0700, Jakub Kicinski wrote:

> > > My thinking is that there are no known uses of the cookie, it'd only

Ahh. I completely misinterpreted the word "uses" here - you meant, I
think (now), "uses of the cookie in the way that it was done in ethtool
before". I read over this because it seemed in a way obviously right and
also obviously wrong (no other uses of the cookie in ethtool and clearly
uses of the cookie elsewhere, respectively)...

> Right, I was commenting on the need to keep the cookie for backward
> compat.

Right ...

> My preference is to do a policy dump to check the capabilities of the
> kernel rather than shoot messages at it and then try to work backward
> based on the info returned in extack.

I guess Michal disagrees ;-)

I can see both points of view though - if you have just a single
attribute it's basically the same, but once you have two or more it's
way less complex to just query before, I'd think.

johannes