netdev - Re: [PATCH RFC v2 net-next 03/28] net/sched: act_api: increase TCA_ID

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Date: Mon, 5 Jun 2023 10:39:49 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: netdev@...r.kernel.org, deb.chatterjee@...el.com,
 anjali.singhai@...el.com, namrata.limaye@...el.com, tom@...anda.io,
 p4tc-discussions@...devconf.info, mleitner@...hat.com,
 Mahesh.Shirshyad@....com, Vipin.Jain@....com, tomasz.osinski@...el.com,
 jiri@...nulli.us, xiyou.wangcong@...il.com, davem@...emloft.net,
 edumazet@...gle.com, pabeni@...hat.com, vladbu@...dia.com,
 simon.horman@...igine.com, khalidm@...dia.com, toke@...hat.com
Subject: Re: [PATCH RFC v2 net-next 03/28] net/sched: act_api: increase
 TCA_ID_MAX

On Wed, 17 May 2023 07:02:07 -0400 Jamal Hadi Salim wrote:
> Increase TCA_ID_MAX from 255 to 1023
> 
> Given P4TC dynamic actions required new IDs (dynamically) and 30 of those are
> already taken by the standard actions (such as gact, mirred and ife) we are left
> with 225 actions to create, which seems like a small number.

> diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
> index 5b66df3ec332..337411949ad0 100644
> --- a/include/uapi/linux/pkt_cls.h
> +++ b/include/uapi/linux/pkt_cls.h
> @@ -140,9 +140,9 @@ enum tca_id {
>  	TCA_ID_MPLS,
>  	TCA_ID_CT,
>  	TCA_ID_GATE,
> -	TCA_ID_DYN,
> +	TCA_ID_DYN = 256,
>  	/* other actions go here */
> -	__TCA_ID_MAX = 255
> +	__TCA_ID_MAX = 1023
>  };
>  
>  #define TCA_ID_MAX __TCA_ID_MAX

I haven't look at any of the patches but this stands out as bad idea
on the surface.