netdev - Re: [PATCH net-next v4 2/3] net: flower: add support for matching cfm fields

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Message-ID: <j6nx4m5li4lazpm5garenctjpyftsqva4x3jd27mdgb4qti3xs@dvrgcqm24hbx>
Date: Wed, 3 May 2023 22:15:27 +0200
From: Zahari Doychev <zahari.doychev@...ux.com>
To: Ido Schimmel <idosch@...sch.org>
Cc: netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com, 
	jiri@...nulli.us, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
	pabeni@...hat.com, hmehrtens@...linear.com, aleksander.lobakin@...el.com, 
	simon.horman@...igine.com, Zahari Doychev <zdoychev@...linear.com>
Subject: Re: [PATCH net-next v4 2/3] net: flower: add support for matching
 cfm fields

On Mon, May 01, 2023 at 09:56:15AM +0300, Ido Schimmel wrote:
> On Sun, Apr 30, 2023 at 06:35:13PM +0200, Zahari Doychev wrote:
> > On Sun, Apr 30, 2023 at 05:49:57PM +0300, Ido Schimmel wrote:
> > > On Tue, Apr 25, 2023 at 11:16:29PM +0200, Zahari Doychev wrote:
> > > > +static const struct nla_policy cfm_opt_policy[TCA_FLOWER_KEY_CFM_OPT_MAX] = {
> > > > +	[TCA_FLOWER_KEY_CFM_MD_LEVEL]	= NLA_POLICY_MAX(NLA_U8, 7),
> > > 
> > > Instead of 7, can you use FIELD_MAX(FLOW_DIS_CFM_MDL_MASK) like you did
> > > in the previous version?
> > > 
> > 
> > It seems that the macro can be use only inside functions. I wanted to use it
> > but I was getting the following error:
> > 
> > linux/include/linux/bitfield.h:86:9: error: braced-group within expression allowed only inside a function
> 
> I see. Another option that I personally find better than hard-coding 7
> is the below:

I was thinking about the same. I will change it in the next version.

Thanks,
Zahari

> 
> diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
> index 479b66b11d2d..52f30906b210 100644
> --- a/include/net/flow_dissector.h
> +++ b/include/net/flow_dissector.h
> @@ -317,6 +317,7 @@ struct flow_dissector_key_cfm {
>  };
>  
>  #define FLOW_DIS_CFM_MDL_MASK GENMASK(7, 5)
> +#define FLOW_DIS_CFM_MDL_MAX 7
>  
>  enum flow_dissector_key_id {
>         FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
> diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
> index 5d77da484a88..85fc77063866 100644
> --- a/net/sched/cls_flower.c
> +++ b/net/sched/cls_flower.c
> @@ -772,7 +772,8 @@ mpls_stack_entry_policy[TCA_FLOWER_KEY_MPLS_OPT_LSE_MAX + 1] = {
>  };
>  
>  static const struct nla_policy cfm_opt_policy[TCA_FLOWER_KEY_CFM_OPT_MAX] = {
> -       [TCA_FLOWER_KEY_CFM_MD_LEVEL]   = NLA_POLICY_MAX(NLA_U8, 7),
> +       [TCA_FLOWER_KEY_CFM_MD_LEVEL]   = NLA_POLICY_MAX(NLA_U8,
> +                                                        FLOW_DIS_CFM_MDL_MAX),
>         [TCA_FLOWER_KEY_CFM_OPCODE]     = { .type = NLA_U8 },
>  };