netdev - Re: [PATCH v4 net-next] net:sched: add action inheritdsfield to skbedit

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Date:   Wed, 20 Jun 2018 15:40:27 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     Michel Machado <michel@...irati.com.br>,
        "Fu, Qiaobin" <qiaobinf@...edu>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jhs@...atatu.com" <jhs@...atatu.com>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>
Subject: Re: [PATCH v4 net-next] net:sched: add action inheritdsfield to
 skbedit

On Wed, Jun 20, 2018 at 07:02:41PM +0200, Davide Caratti wrote:
...
> >     I agree that we should update the drop counter, but given that 
> > you're already converting the stats to be per-cpu counters, whatever we 
> > add now will be just symbolic since you're going to change it anyway.

It wouldn't be symbolic. One thing is to convert a given increment
into something else, another is to start increasing it for some (new)
reason.

> 
> that's ok for me also, as I can use the current v4 code for the rebase
> (and not wait for another respin) _ but let's hear what reviewers think.
> 
> >  If 
> > reviewers think that Qiaobin's patch must add the update line, could you 
> > provide the exact line and location so we avoid going to v6 of this patch?
> 
> In case, I was thinking of something like: 
> 
> https://elixir.bootlin.com/linux/v4.18-rc1/source/net/sched/act_ipt.c#L249
> 
> so, between 'err:' and 'spin_unlock(&d->tcf_lock)', insert a line like:
> 
> d->tcf_qstats.drop++;

I prefer the more complete version. Then it will have a more complete
(git) history and help people when troubleshooting.

Thanks,
Marcelo