netdev - Re: [patch net-next] tc: introduce OpenFlow classifier

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Message-ID: <20150327122846.GA2172@nanopsycho.orion>
Date:	Fri, 27 Mar 2015 13:28:46 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
	jesse@...ira.com
Subject: Re: [patch net-next] tc: introduce OpenFlow classifier

Fri, Mar 27, 2015 at 12:44:02PM CET, tgraf@...g.ch wrote:
>On 03/27/15 at 07:07am, Jiri Pirko wrote:
>> well, you can do *everything* with cls_bpf now that it supports ebpf.
>> But I think it is a big hammer. cls_openflow suppose to be just
>> replacement for existing ovs classification, with very simple and well
>> understood uapi.
>
>The current linear filtering approach makes it not suitable
>right now. No doubt that unifying flow classification would
>be great to have.
>
>Once you start building some form of wildcarded hash tables
>into this, I see a lot of overlap with cls_flow appearing.
>What about extending cls_flow instead? Are you still planning
>to have one cls_classifier instance per wildcard flow?

I'm not fan of extending cls_flow. It does something else. It calculates
hash and set classid according to that. I like better to do cls_openflow
on side.


>
>I'm usually all for small steps and take it from there but you
>are setting a uapi in stone here and once you add linear
>filtering behaviour you can't just undo it without a ton of
>flags.


Sure, what exactly is your uapi change proposal? I'd be glad to
incorporate it.
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