netdev - Re: [RFC net-next 1/4] ynl: add intro docs for the concept

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Date:   Tue, 16 Aug 2022 09:07:14 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, sdf@...gle.com, jacob.e.keller@...el.com,
        vadfed@...com, jiri@...nulli.us, dsahern@...nel.org,
        stephen@...workplumber.org, fw@...len.de, linux-doc@...r.kernel.org
Subject: Re: [RFC net-next 1/4] ynl: add intro docs for the concept

On Mon, 2022-08-15 at 17:32 -0700, Jakub Kicinski wrote:
> On Mon, 15 Aug 2022 22:09:29 +0200 Johannes Berg wrote:
> > On Wed, 2022-08-10 at 19:23 -0700, Jakub Kicinski wrote:
> > > 
> > > +Note that attribute spaces do not themselves nest, nested attributes refer to their internal
> > > +space via a ``nested-attributes`` property, so the YAML spec does not resemble the format
> > > +of the netlink messages directly.  
> > 
> > I find this a bit ... confusing.
> > 
> > I think reading the other patch I know what you mean, but if I think of
> > this I think more of the policy declarations than the message itself,
> > and there we do refer to another policy?
> > 
> > Maybe reword a bit and say
> > 
> >    Note that attribute spaces do not themselves nest, nested attributes
> >    refer to their internal space via a ``nested-attributes`` property
> >    (the name of another or the same attribute space).
> > 
> > or something?
> 
> I think I put the cart before the horse in this looong sentence. How
> about:
> 
>   Note that the YAML spec is "flattened" and is not meant to visually
>   resemble the format of the netlink messages (unlike certain ad-hoc documentation
>   formats seen in kernel comments). In the YAML spec subordinate attribute sets
>   are not defined inline as a nest, but defined in a separate attribute set
>   referred to with a ``nested-attributes`` property of the container.
> 
Yeah, that makes sense.

Like I said, I was already thinking of the policy structures (and the
policy advertisement to userspace) which is exactly the same way, so I
didn't see this as much different - but of course it _is_ different from
the message itself.

johannes