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

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Date: Thu, 1 Feb 2024 16:04:16 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Jacob Keller <jacob.e.keller@...el.com>
Cc: Donald Hunter <donald.hunter@...il.com>, <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>, 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 Thu, 1 Feb 2024 12:53:08 -0800 Jacob Keller wrote:
> On 1/29/2024 5:42 PM, Jakub Kicinski wrote:
> > Whether YNL specs should replace policy dumps completely (by building
> > the YAML into the kernel, and exposing via sysfs like kheaders or btf)
> >  - I'm not sure. I think I used policy dumps twice in my life. They
> > are not all that useful, IMVHO...  
> 
> Many older genetlink/netlink families don't have a super robust or
> specific policy. For example, devlink has a single enum for all
> attributes, and the policy is not specified per command. The policy
> simply accepts all attributes for every command. This means that you
> can't rely on policy to decide whether an attribute has meaning for a
> given command.

FWIW Jiri converted devlink to use ynl policy generation. AFAIU it now
only accepts what's used and nobody complained, yet, knock wood.

Agreed on other points :)