netdev - Re: [PATCH net-next v3 4/5] net/tc: introduce TC_ACT

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Date:   Wed, 25 Jul 2018 08:27:22 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Paolo Abeni <pabeni@...hat.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>,
        Daniel Borkmann <daniel@...earbox.net>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Eyal Birger <eyal.birger@...il.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next v3 4/5] net/tc: introduce TC_ACT_REINJECT.

On 25/07/18 04:29 AM, Paolo Abeni wrote:
> On Tue, 2018-07-24 at 13:50 -0700, Cong Wang wrote:

[..]
>>> I fail to understand why overlimit is increased in your case
>>> here. I guess you want to increase 'drops' instead.
>>
>> Hmm, actually the current mirred code increases overlimit too.
>> But I still don't think it makes sense.
> 
> Yep, I chose to increment 'overlimits' to preserve the current mirred
> semantic.
> 
> AFAICS, that was first introduced with:
> 
> commit 8919bc13e8d92c5b082c5c0321567383a071f5bc
> Author: Jamal Hadi Salim <jhs@...atatu.com>
> Date:   Mon Aug 15 05:25:40 2011 +0000
> 
>      net_sched: fix port mirror/redirect stats reporting
> 
> Likely increasing 'drops' would be "better", but I'm unsure we can
> change this established behavior without affecting some user.
> 

Those changes were there from the beginning (above patch did
not introduce them).
IIRC, the reason was to distinguish between policy intended
drops and drops because of errors.

cheers,
jamal