netdev - Re: [RFC] pkt_sched: gen_estimator: Dont report fake rate estimators

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Date:	Fri, 2 Oct 2009 07:08:19 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [RFC] pkt_sched: gen_estimator: Dont report fake rate
	estimators

On 01-10-2009 23:21, Jarek Poplawski wrote:
> David Miller wrote, On 10/01/2009 11:14 PM:
> 
>> From: Jarek Poplawski <jarkao2@...il.com>
>> Date: Thu, 01 Oct 2009 23:05:53 +0200
>>
>>> Since you ask... I wonder about this whole int plus quite a bit of
>>> struct unreadability for one flag only. Maybe it could be queried
>>> on qdisc level (with a flag if necessary), and additional parameter
>>> of gnet_stats_copy_rate_est()? (Qdiscs should have no problem with
>>> setting this param for their classes too.)
>> Certainly, that's another approach to this problem.
>>
>> But logically, just like we wouldn't emit a block of RED scheduler
>> data to 'tc' unless RED is actually configured, it seems consistent to
>> not emit estimator data when no estimator is even there.
> 
> Sure! I've exaggerated with this additional parameter. ;-)

To make my point clare: why not something like this?:

static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
                         u32 pid, u32 seq, u16 flags, int event)
{
	...
	if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
	    (gen_estimator_active(&q->bstats, &q->rate_est) &&
             gnet_stats_copy_rate_est(&d, &q->rate_est) < 0) ||
            gnet_stats_copy_queue(&d, &q->qstats) < 0)
                goto nla_put_failure;

BTW, I'm not sure we need to chanage user visible API for this.
(Is it really expected to work after updating gen_stats.h only in
iproute?)

Jarek P.
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