netdev - Re: [PATCH net-next v2 0/4] Implement classifier-action terse dump mode

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Message-ID: <1581796d-2f28-397b-d234-2614b1e64f8a@solarflare.com>
Date:   Tue, 19 May 2020 15:30:59 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     Vlad Buslov <vladbu@...lanox.com>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <jhs@...atatu.com>, <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <dcaratti@...hat.com>, <marcelo.leitner@...il.com>,
        <kuba@...nel.org>
Subject: Re: [PATCH net-next v2 0/4] Implement classifier-action terse dump
 mode

On 19/05/2020 10:04, Vlad Buslov wrote:
> On Mon 18 May 2020 at 18:37, Edward Cree <ecree@...arflare.com> wrote:
>> I.e. if next year it turns out that some
>>  user needs one parameter that's been omitted here, but not the whole dump,
>>  are they going to want to add another mode to the uapi?
> Why not just extend terse dump? I won't break user land unless you are
> removing something from it.
But then all terse dump users pay the performance cost for thatone
 app's extra need.

> - Generic data is covered by current terse dump implementation.
>   Everything else will be act or cls specific
Fair point.
I don't suppose something something BPF mumble solve this? I haven't
 been following the BPF dumping work in detail but it sounds like it
 might be a cheap way to get the 'more performant next step' that
 was mentioned in the subthread with David.  Just a thought.

-ed