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 14:36:11 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Edward Cree <ecree@...arflare.com>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        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

Mon, Apr 20, 2020 at 02:28:22PM CEST, ecree@...arflare.com wrote:
>On 20/04/2020 12:52, Jiri Pirko wrote:
>> However for TC, when user specifies "HW_STATS_DISABLED", the driver
>> should not do stats.
>What should a driver do if the user specifies DISABLED, but the stats
> are still needed for internal bookkeeping (e.g. to prod an ARP entry
> that's in use for encapsulation offload, so that it doesn't get
> expired out of the cache)?  Enable the stats on the HW anyway but
> not report them to FLOW_CLS_STATS?  Or return an error?

If internally needed, it means they cannot be disabled. So returning
error would make sense, as what the user requested is not supported.


>
>-ed