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Date:   Wed, 6 May 2020 07:22:10 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        netfilter-devel@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org, ecree@...arflare.com
Subject: Re: [PATCH net,v2] net: flow_offload: skip hw stats check for
 FLOW_ACTION_HW_STATS_DONT_CARE

Tue, May 05, 2020 at 08:46:16PM CEST, kuba@...nel.org wrote:
>On Tue, 5 May 2020 20:36:43 +0200 Jiri Pirko wrote:
>> Tue, May 05, 2020 at 07:47:36PM CEST, pablo@...filter.org wrote:
>> >This patch adds FLOW_ACTION_HW_STATS_DONT_CARE which tells the driver
>> >that the frontend does not need counters, this hw stats type request
>> >never fails. The FLOW_ACTION_HW_STATS_DISABLED type explicitly requests
>> >the driver to disable the stats, however, if the driver cannot disable
>> >counters, it bails out.
>> >
>> >TCA_ACT_HW_STATS_* maintains the 1:1 mapping with FLOW_ACTION_HW_STATS_*
>> >except by disabled which is mapped to FLOW_ACTION_HW_STATS_DISABLED
>> >(this is 0 in tc). Add tc_act_hw_stats() to perform the mapping between
>> >TCA_ACT_HW_STATS_* and FLOW_ACTION_HW_STATS_*.
>> >
>> >Fixes: 319a1d19471e ("flow_offload: check for basic action hw stats type")
>> >Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>  
>> 
>> Looks great. Thanks!
>> 
>> Reviewed-by: Jiri Pirko <jiri@...lanox.com>
>
>Is this going to "just work" for mlxsw?
>
>        act = flow_action_first_entry_get(flow_action);                         
>        if (act->hw_stats == FLOW_ACTION_HW_STATS_ANY ||                        
>            act->hw_stats == FLOW_ACTION_HW_STATS_IMMEDIATE) {                  
>                /* Count action is inserted first */                            
>                err = mlxsw_sp_acl_rulei_act_count(mlxsw_sp, rulei, extack);    
>                if (err)                                                        
>                        return err;                                             
>        } else if (act->hw_stats != FLOW_ACTION_HW_STATS_DISABLED) {            
>                NL_SET_ERR_MSG_MOD(extack, "Unsupported action HW stats type"); 
>                return -EOPNOTSUPP;                                             
>        }
>
>if hw_stats is 0 we'll get into the else and bail.
>
>That doesn't deliver on the "don't care" promise, no?

Yeah, we need to handle dontcare there, you are right.

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