netdev - Re: [patch net-next v2 03/12] flow_offload: check for basic action hw stats type

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Message-ID: <20200302113319.22fb0cb1@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 2 Mar 2020 11:33:19 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, saeedm@...lanox.com,
        leon@...nel.org, michael.chan@...adcom.com, vishal@...lsio.com,
        jeffrey.t.kirsher@...el.com, idosch@...lanox.com,
        aelior@...vell.com, peppe.cavallaro@...com,
        alexandre.torgue@...com, jhs@...atatu.com,
        xiyou.wangcong@...il.com, pablo@...filter.org,
        ecree@...arflare.com, mlxsw@...lanox.com
Subject: Re: [patch net-next v2 03/12] flow_offload: check for basic action
 hw stats type

On Sun, 1 Mar 2020 10:00:09 +0100 Jiri Pirko wrote:
> Sat, Feb 29, 2020 at 08:18:48PM CET, kuba@...nel.org wrote:
> >On Sat, 29 Feb 2020 08:40:04 +0100 Jiri Pirko wrote:  
> >> Fri, Feb 28, 2020 at 08:40:56PM CET, kuba@...nel.org wrote:  
> >> >On Fri, 28 Feb 2020 18:24:56 +0100 Jiri Pirko wrote:    
> >> >> @@ -299,6 +300,9 @@ static int bnxt_tc_parse_actions(struct bnxt *bp,
> >> >>  		return -EINVAL;
> >> >>  	}
> >> >>  
> >> >> +	if (!flow_action_basic_hw_stats_types_check(flow_action, extack))
> >> >> +		return -EOPNOTSUPP;    
> >> >
> >> >Could we have this helper take one stat type? To let drivers pass the
> >> >stat type they support?     
> >> 
> >> That would be always "any" as "any" is supported by all drivers.
> >> And that is exactly what the helper checks..  
> >
> >I'd think most drivers implement some form of DELAYED today, 'cause for
> >the number of flows things like OvS need that's the only practical one.
> >I was thinking to let drivers pass DELAYED here.
> >
> >I agree that your patch would most likely pass ANY in almost all cases
> >as you shouldn't be expected to know all the drivers, but at least the
> >maintainers can easily just tweak the parameter.
> >
> >Does that make sense? Maybe I'm missing something.  
> 
> Well, I guess. mlx5 only supports "delayed". It would work for it.
> How about having flow_action_basic_hw_stats_types_check() as is and
> add flow_action_basic_hw_stats_types_check_ext() that would accept extra
> arg with enum?

SGTM, perhaps with a more concise name? 
Just flow_basic_hw_stats_check()?