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Date: Fri, 02 Oct 2009 22:11:27 +0200
From: Jarek Poplawski <jarkao2@...il.com>
To: Eric Dumazet <eric.dumazet@...il.com>
CC: David Miller <davem@...emloft.net>, kaber@...sh.net,
netdev@...r.kernel.org
Subject: Re: [RFC take2] pkt_sched: gen_estimator: Dont report fake rate estimators
Eric Dumazet wrote, On 10/02/2009 02:39 PM:
> Jarek Poplawski a écrit :
>
>> So you prefer the additional parameter version, but since these
>> _active tests are not needed e.g. for HTB classes, which got it
>> active by default, so maybe bstats == NULL would let skip such a test?
>>
>> ...
>>> --- a/include/net/gen_stats.h
>>> +++ b/include/net/gen_stats.h
>>> @@ -30,6 +30,7 @@ extern int gnet_stats_start_copy_compat(struct sk_buff *skb, int type,
>>> extern int gnet_stats_copy_basic(struct gnet_dump *d,
>>> struct gnet_stats_basic_packed *b);
>>> extern int gnet_stats_copy_rate_est(struct gnet_dump *d,
>>> + const struct gnet_stats_basic_packed *bstats,
>> It seems these *b/*bstats defs could look more consistent. Otherwise
>> it looks OK to me.
>
> Agreed, here is the updated version, I added your Signoff if you dont mind :)
Hmm... So you made me to do some "real" work here, and guess what?:
there is one serious checkpatch warning! ;-) Plus, this new parameter
should be added to the function description. Otherwise:
Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
Thanks,
Jarek P.
PS: I guess full "Don't" would show we really mean it...
> [RFC] pkt_sched: gen_estimator: Dont report fake rate estimators
>
> We currently send TCA_STATS_RATE_EST elements to netlink users, even if no estimator
> is running.
>
> # tc -s -d qdisc
> qdisc pfifo_fast 0: dev eth0 root bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
> Sent 112833764978 bytes 1495081739 pkt (dropped 0, overlimits 0 requeues 0)
> rate 0bit 0pps backlog 0b 0p requeues 0
>
> User has no way to tell if the "rate 0bit 0pps" is a real estimation, or a fake
> one (because no estimator is active)
>
> After this patch, tc command output is :
> $ tc -s -d qdisc
> qdisc pfifo_fast 0: dev eth0 root bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
> Sent 561075 bytes 1196 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
>
> We add a parameter to gnet_stats_copy_rate_est() function so that
> it can use gen_estimator_active(bstats, r), as suggested by Jarek.
>
> This parameter can be NULL if check is not necessary, (htb for
> example has a mandatory rate estimator)
>
>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
> ---
> include/net/gen_stats.h | 1 +
> net/core/gen_stats.c | 7 ++++++-
> net/sched/act_api.c | 2 +-
> net/sched/sch_api.c | 2 +-
> net/sched/sch_cbq.c | 2 +-
> net/sched/sch_drr.c | 2 +-
> net/sched/sch_hfsc.c | 2 +-
> net/sched/sch_htb.c | 2 +-
> 8 files changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
> index c148855..eb87a14 100644
> --- a/include/net/gen_stats.h
> +++ b/include/net/gen_stats.h
> @@ -30,6 +30,7 @@ extern int gnet_stats_start_copy_compat(struct sk_buff *skb, int type,
> extern int gnet_stats_copy_basic(struct gnet_dump *d,
> struct gnet_stats_basic_packed *b);
> extern int gnet_stats_copy_rate_est(struct gnet_dump *d,
> + const struct gnet_stats_basic_packed *b,
> struct gnet_stats_rate_est *r);
> extern int gnet_stats_copy_queue(struct gnet_dump *d,
> struct gnet_stats_queue *q);
> diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
> index 8569310..054a49c 100644
> --- a/net/core/gen_stats.c
> +++ b/net/core/gen_stats.c
> @@ -136,8 +136,13 @@ gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
> * if the room in the socket buffer was not sufficient.
> */
> int
> -gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r)
> +gnet_stats_copy_rate_est(struct gnet_dump *d,
> + const struct gnet_stats_basic_packed *b,
> + struct gnet_stats_rate_est *r)
> {
> + if (b && !gen_estimator_active(b, r))
> + return 0;
> +
> if (d->compat_tc_stats) {
> d->tc_stats.bps = r->bps;
> d->tc_stats.pps = r->pps;
> diff --git a/net/sched/act_api.c b/net/sched/act_api.c
> index 2dfb3e7..2b0d5ee 100644
> --- a/net/sched/act_api.c
> +++ b/net/sched/act_api.c
> @@ -618,7 +618,7 @@ int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
> goto errout;
>
> if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
> - gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
> + gnet_stats_copy_rate_est(&d, &h->tcf_bstats, &h->tcf_rate_est) < 0 ||
> gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
> goto errout;
>
> diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
> index 903e418..1acfd29 100644
> --- a/net/sched/sch_api.c
> +++ b/net/sched/sch_api.c
> @@ -1179,7 +1179,7 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
> goto nla_put_failure;
>
> if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
> - gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
> + gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
> gnet_stats_copy_queue(&d, &q->qstats) < 0)
> goto nla_put_failure;
>
> diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
> index 5b132c4..3846d65 100644
> --- a/net/sched/sch_cbq.c
> +++ b/net/sched/sch_cbq.c
> @@ -1609,7 +1609,7 @@ cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg,
> cl->xstats.undertime = cl->undertime - q->now;
>
> if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
> - gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
> + gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
> gnet_stats_copy_queue(d, &cl->qstats) < 0)
> return -1;
>
> diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
> index 5a888af..a65604f 100644
> --- a/net/sched/sch_drr.c
> +++ b/net/sched/sch_drr.c
> @@ -280,7 +280,7 @@ static int drr_dump_class_stats(struct Qdisc *sch, unsigned long arg,
> }
>
> if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
> - gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
> + gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
> gnet_stats_copy_queue(d, &cl->qdisc->qstats) < 0)
> return -1;
>
> diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
> index 2c5c76b..b38b39c 100644
> --- a/net/sched/sch_hfsc.c
> +++ b/net/sched/sch_hfsc.c
> @@ -1375,7 +1375,7 @@ hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
> xstats.rtwork = cl->cl_cumul;
>
> if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
> - gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
> + gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
> gnet_stats_copy_queue(d, &cl->qstats) < 0)
> return -1;
>
> diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
> index 85acab9..2e38d1a 100644
> --- a/net/sched/sch_htb.c
> +++ b/net/sched/sch_htb.c
> @@ -1105,7 +1105,7 @@ htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d)
> cl->xstats.ctokens = cl->ctokens;
>
> if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
> - gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
> + gnet_stats_copy_rate_est(d, NULL, &cl->rate_est) < 0 ||
> gnet_stats_copy_queue(d, &cl->qstats) < 0)
> return -1;
>
> --
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