netdev - Re: [PATCH iproute2] genl: print caps for all families

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Date:   Thu, 23 Feb 2023 19:27:42 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     dsahern@...il.com, jhs@...atatu.com, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] genl: print caps for all families

On Thu, 23 Feb 2023 17:52:34 -0800
Jakub Kicinski <kuba@...nel.org> wrote:

> Back in 2006 kernel commit 334c29a64507 ("[GENETLINK]: Move
> command capabilities to flags.") removed some attributes and
> moved the capabilities to flags. Corresponding iproute2
> commit 26328fc3933f ("Add controller support for new features
> exposed") added the ability to print those caps.
> 
> Printing is gated on version of the family, but we're checking
> the version of each individual family rather than the control
> family. The format of attributes in the control family
> is dictated by the version of the control family alone.
> 
> Families can't use flags for random things, anyway,
> because kernel core has a fixed interpretation.
> 
> Thanks to this change caps will be shown for all families
> (assuming kernel newer than 2.6.19), not just those which
> by coincidence have their local version >= 2.
> 
> For instance devlink, before:
> 
>   $ genl ctrl get name devlink
>   Name: devlink
> 	ID: 0x15  Version: 0x1  header size: 0  max attribs: 179
> 	commands supported:
> 		#1:  ID-0x1
> 		#2:  ID-0x5
> 		#3:  ID-0x6
> 		...
> 
> after:
> 
>   $ genl ctrl get name devlink
>   Name: devlink
> 	ID: 0x15  Version: 0x1  header size: 0  max attribs: 179
> 	commands supported:
> 		#1:  ID-0x1
> 		Capabilities (0xe):
>  		  can doit; can dumpit; has policy
> 
> 		#2:  ID-0x5
> 		Capabilities (0xe):
>  		  can doit; can dumpit; has policy
> 
> 		#3:  ID-0x6
> 		Capabilities (0xb):
>  		  requires admin permission; can doit; has policy
> 
> Leave ctrl_v as 0 if we fail to read the version. Old code used 1
> as the default, but 0 or 1 - does not matter, checks are for >= 2.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

What about JSON support. Is genl not json ready yet?