netdev - Re: [PATCH net-next 1/3] net/sched: Introduce action ct

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Date:   Thu, 13 Jun 2019 12:16:59 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     Paul Blakey <paulb@...lanox.com>, Jiri Pirko <jiri@...lanox.com>,
        Roi Dayan <roid@...lanox.com>,
        Yossi Kuperman <yossiku@...lanox.com>,
        Oz Shlomo <ozsh@...lanox.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
        Aaron Conole <aconole@...hat.com>,
        Zhike Wang <wangzhike@...com>
Cc:     Rony Efraim <ronye@...lanox.com>, nst-kernel@...hat.com,
        John Hurley <john.hurley@...ronome.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Justin Pettit <jpettit@....org>
Subject: Re: [PATCH net-next 1/3] net/sched: Introduce action ct

hello Paul!

On Tue, 2019-06-11 at 16:28 +0300, Paul Blakey wrote:

> +#endif /* __NET_TC_CT_H */
> diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
> index a93680f..c5264d7 100644
> --- a/include/uapi/linux/pkt_cls.h
> +++ b/include/uapi/linux/pkt_cls.h
> @@ -83,6 +83,7 @@ enum {
>  #define TCA_ACT_SIMP 22
>  #define TCA_ACT_IFE 25
>  #define TCA_ACT_SAMPLE 26
> +#define TCA_ACT_CT 27

^^  I think you can't use 27 (act_ctinfo forgot to explicitly define it),
or the uAPI will break. See below:

>  /* Action type identifiers*/
>  enum tca_id {
> @@ -106,6 +107,7 @@ enum tca_id {
>  	TCA_ID_SAMPLE = TCA_ACT_SAMPLE,
>  	/* other actions go here */
>  	TCA_ID_CTINFO,
> +	TCA_ID_CT,
>  	__TCA_ID_MAX = 255
>  };

and (minor ntit) the comment 

/* other actions go here */

should be interpreted like 

/* other actions go right above this comment */

otherwise the comment will float up as we continue adding new TC actions.

After your patch CTinfo and CT will have the same ID:

[dcaratti@...alhost tmp.j4kzBzv3oe]$ cat prova.c 
#include <stdio.h>

#define UNO 1
#define DUE 2
#define TRE 3
#define QUATTRO 4

enum {
        TCA_ID_UNO = UNO,
        TCA_ID_DUE = DUE,
        TCA_ID_TRE = TRE,
        TCA_ID_CTINFO,
        TCA_ID_QUATTRO = QUATTRO,
        TCA_ID_MAX
};

int main (int argc, const char *argv[])
{
        printf("%d %d %d %d %d %d\n", TCA_ID_UNO, TCA_ID_DUE, TCA_ID_TRE,
TCA_ID_CTINFO, TCA_ID_QUATTRO, TCA_ID_MAX);
        return 0;
}
[dcaratti@...alhost tmp.j4kzBzv3oe]$ gcc prova.c -o prova
[dcaratti@...alhost tmp.j4kzBzv3oe]$ ./prova 
1 2 3 4 4 5
[dcaratti@...alhost tmp.j4kzBzv3oe]$ 

so, I think you should use 28. And I will send a patch for net-next now
that adds the missing define for TCA_ID_CTINFO. Ok?

-- 
davide