pkt_sched: gen_estimator: Dont report fake rate estimators

Jarek Poplawski a écrit :
>
>
> 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@gmail.com>
>
> Thanks,
> Jarek P.
>
> PS: I guess full "Don't" would show we really mean it...

Okay :) Here is the last round, before the night !

Thanks again

[RFC] pkt_sched: gen_estimator: Don't 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@gmail.com>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
index c1488553e34964b9dbd4a3a66334d4c1f04f16bd..eb87a1447ae15942a302fa3ac8cfbc9ddef78ab7 100644 (file)
--- 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 8569310268ab76ba786402e6b2e6dc994621a7fd..393b1d8618e22d412625c96308bcdf3be8f5a43a 100644 (file)
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -127,6 +127,7 @@ gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
 /**
  * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
  * @d: dumping handle
+ * @b: basic statistics
  * @r: rate estimator statistics
  *
  * Appends the rate estimator statistics to the top level TLV created by
@@ -136,8 +137,13 @@ 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 2dfb3e7a040df7727d79f874e31ee6c1dfbaff8c..ca2e1fd2bf6981a501ab4f34f9af40ab8d0dcd30 100644 (file)
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -618,7 +618,8 @@ 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 903e4188b6ca1057426f8327f0bb1d69f00afb0b..1acfd29cc8269e5a26422b8030623a93112533f8 100644 (file)
--- 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 5b132c473264eb4b428607f524c87d17032b149c..3846d65bc03ec7a7de7e6ca674dc6c2b255dc570 100644 (file)
--- 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 5a888af7e5daed2f46d3293a843de8182f3f6cc3..a65604f8f2b8f8aaa6dce6a2a13ee76e73b295be 100644 (file)
--- 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 2c5c76be18f864e855bebb9020ad007aa8b9449a..b38b39c60752a90a1713c22b9f4d9e0917d11955 100644 (file)
--- 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 85acab9dc6fd8968ebaeea28f931f9c4b5d19763..2e38d1abd8304921ce44610e83052e89267ed9e7 100644 (file)
--- 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;