netdev - Re: [PATCH net-next v1 02/12] tools/net/ynl: Support sub-messages in nested attribute spaces

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Message-ID: <20240124073228.0e939e5c@kernel.org>
Date: Wed, 24 Jan 2024 07:32:28 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Donald Hunter <donald.hunter@...il.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Jonathan
 Corbet <corbet@....net>, linux-doc@...r.kernel.org, Jacob Keller
 <jacob.e.keller@...el.com>, Breno Leitao <leitao@...ian.org>, Jiri Pirko
 <jiri@...nulli.us>, Alessandro Marcolini <alessandromarcolini99@...il.com>,
 donald.hunter@...hat.com
Subject: Re: [PATCH net-next v1 02/12] tools/net/ynl: Support sub-messages
 in nested attribute spaces

On Wed, 24 Jan 2024 09:37:31 +0000 Donald Hunter wrote:
> > Meaning if the key is not found in current scope we'll silently and
> > recursively try outer scopes? Did we already document that?
> > I remember we discussed it, can you share a link to that discussion?  
> 
> Yes, it silently tries outer scopes. The previous discussion is here:
> 
> https://patchwork.kernel.org/project/netdevbpf/patch/20231130214959.27377-7-donald.hunter@gmail.com/#25622101
> 
> This is the doc patch that describes sub-messages:
> 
> https://patchwork.kernel.org/project/netdevbpf/patch/20231215093720.18774-4-donald.hunter@gmail.com/
> 
> It doesn't mention searching outer scopes so I can add that to the docs.

I'm a tiny bit worried about the mis-ordered case. If the selector attr
is after the sub-msg but outer scope has an attr of the same name we'll
silently use the wrong one. It shouldn't happen in practice but can we
notice the wrong ordering and error out cleanly?