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

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Date:   Mon, 27 Apr 2020 15:31:48 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>
CC:     Florian Westphal <fw@...len.de>, <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

On 22/04/2020 19:37, Jiri Pirko wrote:
> "Any" can't be "don't care". TC User expects stats. That's default.
>
> Let's have "don't care" bit only and set it for
> ethtool/netfilter/flowtable. Don't change any. Teach the drivers to deal
> with "don't care", most probably using the default checker.
I think the right solution is either this, or the semantically-similar
 approach of "0 means don't care, we have a bit for disabled, and ANY
 (the TC default) is "all the bits except disabled", i.e.
 DELAYED | IMMEDIATE.  That seems slightly cleaner to me, as then non-
 zero settings are always "here is a bitmask of options, driver may
 choose any of them".  (And 0 differs from DELAYED | IMMEDIATE | DISABLED
 only in that if new bits are added to kernel, 0 includes them.)
And of course either way the TC uAPI needs to be able to specify the
 new "don't care" option.

-ed