Re: [patch net-next v3 09/10] flow_offload: introduce "disabled" HW stats type and allow it in mlxsw

[Jiri Pirko <jiri@resnulli.us>]

Fri, Mar 06, 2020 at 08:31:16PM CET, kuba@kernel.org wrote:
>On Fri,  6 Mar 2020 14:28:55 +0100 Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@mellanox.com>
>> 
>> Introduce new type for disabled HW stats and allow the value in
>> mlxsw offload.
>> 
>> Signed-off-by: Jiri Pirko <jiri@mellanox.com>
>> ---
>> v2->v3:
>> - moved to bitfield
>> v1->v2:
>> - moved to action
>> ---
>>  drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c | 2 +-
>>  include/net/flow_offload.h                            | 1 +
>>  2 files changed, 2 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
>> index 4bf3ac1cb20d..88aa554415df 100644
>> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
>> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
>> @@ -36,7 +36,7 @@ static int mlxsw_sp_flower_parse_actions(struct mlxsw_sp *mlxsw_sp,
>>  		err = mlxsw_sp_acl_rulei_act_count(mlxsw_sp, rulei, extack);
>>  		if (err)
>>  			return err;
>> -	} else {
>> +	} else if (act->hw_stats_type != FLOW_ACTION_HW_STATS_TYPE_DISABLED) {
>>  		NL_SET_ERR_MSG_MOD(extack, "Unsupported action HW stats type");
>>  		return -EOPNOTSUPP;
>>  	}
>> diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
>> index d597d500a5df..b700c570f7f1 100644
>> --- a/include/net/flow_offload.h
>> +++ b/include/net/flow_offload.h
>> @@ -159,6 +159,7 @@ enum flow_action_mangle_base {
>>  #define FLOW_ACTION_HW_STATS_TYPE_DELAYED BIT(1)
>>  #define FLOW_ACTION_HW_STATS_TYPE_ANY (FLOW_ACTION_HW_STATS_TYPE_IMMEDIATE | \
>>  				       FLOW_ACTION_HW_STATS_TYPE_DELAYED)
>> +#define FLOW_ACTION_HW_STATS_TYPE_DISABLED 0
>
>Would it fit better for the bitfield if disabled internally is 
>BIT(last type + 1)? 

I don't see why. Anyway, if needed, this can be always tweaked.