netdev - Re: [PATCH net-next v6 2/3] net sched actions: dump more than TCA_ACT_MAX

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Message-ID: <1492791023.6453.29.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Fri, 21 Apr 2017 09:10:23 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, davem@...emloft.net,
        xiyou.wangcong@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v6 2/3] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

On Fri, 2017-04-21 at 11:40 -0400, Jamal Hadi Salim wrote:
> On 17-04-21 11:20 AM, Eric Dumazet wrote:
> > On Fri, 2017-04-21 at 11:12 -0400, Jamal Hadi Salim wrote:
> >> On 17-04-21 09:12 AM, Jiri Pirko wrote:
> >>> Fri, Apr 21, 2017 at 12:55:31PM CEST, jhs@...atatu.com wrote:
> >>>> From: Jamal Hadi Salim <jhs@...atatu.com>
> >>
> 
> >> Jiri, there is a balance between extensibility and performance.
> >> It is senseless to use a TLV just so i can set a 0/1(true/false).
> >
> > You assume that the (user space) did sensible things.
> >
> 
> If it didnt it is a bug. Seriously.


If the application runs fine on linux-4.0, it is our _duty_ [1] to allow
it to run on linux-4.12.

Particularly if we have very easy ways to do so.

Like using new attributes instead of trying to 'reuse' some padding.

Pretending the old compiler or old applications were buggy is absolutely
irrelevant. That is not the point.

[1] Ask Linus Torvalds about that if you really need to get a final
arbitration.