netdev - Re: [PATCH v4 net-next 0/8] flow_dissector: Protocol specific flow dissector offload

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Date:   Fri, 29 Sep 2017 11:04:23 -0700
From:   Tom Herbert <tom@...bertland.com>
To:     David Miller <davem@...emloft.net>
Cc:     Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Tom Herbert <tom@...ntonium.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Rohit Seth <rohit@...ntonium.net>
Subject: Re: [PATCH v4 net-next 0/8] flow_dissector: Protocol specific flow
 dissector offload

On Fri, Sep 29, 2017 at 10:59 AM, Tom Herbert <tom@...bertland.com> wrote:
> On Fri, Sep 29, 2017 at 10:42 AM, David Miller <davem@...emloft.net> wrote:
>> From: Tom Herbert <tom@...bertland.com>
>> Date: Fri, 29 Sep 2017 08:48:55 -0700
>>
>>> The flow_dissector interface is not a uAPI.
>>
>> That's not true, insofar as cls_flower.c uses the flow_dissector
>> therefore if you change the flow_dissector in certain ways then
>> cls_flower.c might have it's behavior changed and that is in fact UAPI
>> facing.
>
> Then I would suggest adding another flag like FLOW_DISSECTOR_F_FLOWER
> and when anyone puts new code into flow_dissector they can wrap it
> with "if !(flags & FLOW_DISSECTOR_F_FLOWER)". If the flower uAPI is
> subsequently update then the conditional can be removed. This way
> flower can support maintain its APIs, but we can still still extend
> and improve flow_dissector for othersuse cases.
>
Actually, it would make more sense to have the converse so we don't
have to touch flower. I will add FLOW_DISSECTOR_F_NOT_FLOWER

> Tom