netdev - Re: [PATCH net] net: flow_offload: skip hw stats check for FLOW_ACTION_HW_STATS

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Date:   Mon, 20 Apr 2020 10:02:00 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netfilter-devel@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org, kuba@...nel.org
Subject: Re: [PATCH net] net: flow_offload: skip hw stats check for
 FLOW_ACTION_HW_STATS_DISABLED

Sun, Apr 19, 2020 at 01:53:38PM CEST, pablo@...filter.org wrote:
>If the frontend requests no stats through FLOW_ACTION_HW_STATS_DISABLED,
>drivers that are checking for the hw stats configuration bail out with
>EOPNOTSUPP.

Wait, that was a point. Driver has to support stats disabling.


>
>Fixes: 319a1d19471e ("flow_offload: check for basic action hw stats type")
>Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
>---
> include/net/flow_offload.h | 3 +++
> 1 file changed, 3 insertions(+)
>
>diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
>index 3619c6acf60f..c2519a25d0bd 100644
>--- a/include/net/flow_offload.h
>+++ b/include/net/flow_offload.h
>@@ -326,6 +326,9 @@ __flow_action_hw_stats_check(const struct flow_action *action,
> 	if (!flow_action_mixed_hw_stats_check(action, extack))
> 		return false;
> 	action_entry = flow_action_first_entry_get(action);
>+	if (action_entry->hw_stats == FLOW_ACTION_HW_STATS_DISABLED)
>+		return true;
>+
> 	if (!check_allow_bit &&
> 	    action_entry->hw_stats != FLOW_ACTION_HW_STATS_ANY) {
> 		NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
>-- 
>2.11.0
>