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

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Date:   Tue, 3 Mar 2020 12:46:24 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kuba@...nel.org>
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

Mon, Mar 02, 2020 at 08:33:19PM CET, kuba@...nel.org wrote:
>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()?

Will try :)