From: Florian Westphal <fw@strlen.de>
To: Jiri Pirko <jiri@resnulli.us>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>,
Edward Cree <ecree@solarflare.com>,
netfilter-devel@vger.kernel.org, davem@davemloft.net,
netdev@vger.kernel.org, kuba@kernel.org
Subject: Re: [PATCH net] net: flow_offload: skip hw stats check for FLOW_ACTION_HW_STATS_DISABLED
Date: Mon, 20 Apr 2020 15:57:54 +0200 [thread overview]
Message-ID: <20200420135754.GD32392@breakpoint.cc> (raw)
In-Reply-To: <20200420134826.GH6581@nanopsycho.orion>
Jiri Pirko <jiri@resnulli.us> wrote:
> Mon, Apr 20, 2020 at 02:39:15PM CEST, pablo@netfilter.org wrote:
> >On Mon, Apr 20, 2020 at 01:28:22PM +0100, Edward Cree 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?
> >
> >My interpretation is that HW_STATS_DISABLED means that the front-end
> >does not care / does not need counters. The driver can still allocate
>
> That is wrong interpretation. If user does not care, he specifies "ANY".
> That is the default.
>
> When he says "DISABLED" he means disabled. Not "I don't care".
Under what circumstances would the user care about this?
Rejecting such config seems to be just to annoy user?
I mean, the user is forced to use SW datapath just because HW can't turn
off stats?! Same for a config change, why do i need to change my rules
to say 'enable stats' even though I don't need them in first place?
Unlike the inverse (want feature X but HW can't support it), it makes
no sense to me to reject with an error here:
stats-off is just a hint that can be safely ignored.
next prev parent reply other threads:[~2020-04-20 13:58 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-19 11:53 [PATCH net] net: flow_offload: skip hw stats check for FLOW_ACTION_HW_STATS_DISABLED Pablo Neira Ayuso
2020-04-20 8:02 ` Jiri Pirko
2020-04-20 9:05 ` Pablo Neira Ayuso
2020-04-20 9:13 ` Jiri Pirko
2020-04-20 10:03 ` Pablo Neira Ayuso
2020-04-20 11:52 ` Jiri Pirko
2020-04-20 12:13 ` Pablo Neira Ayuso
2020-04-20 13:49 ` Jiri Pirko
2020-04-20 12:28 ` Edward Cree
2020-04-20 12:36 ` Jiri Pirko
2020-04-20 12:49 ` Pablo Neira Ayuso
2020-04-20 13:46 ` Jiri Pirko
2020-04-20 12:39 ` Pablo Neira Ayuso
2020-04-20 13:48 ` Jiri Pirko
2020-04-20 13:57 ` Florian Westphal [this message]
2020-04-20 14:14 ` Jiri Pirko
2020-04-20 19:18 ` Pablo Neira Ayuso
2020-04-22 18:37 ` Jiri Pirko
2020-04-27 14:31 ` Edward Cree
2020-04-27 18:12 ` Jakub Kicinski
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