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>

8 files changed, 15 insertions, 7 deletions

diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
index c1488553e349..eb87a1447ae1 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 8569310268ab..393b1d8618e2 100644
--- 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 2dfb3e7a040d..ca2e1fd2bf69 100644
--- 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 903e4188b6ca..1acfd29cc826 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 5b132c473264..3846d65bc03e 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 5a888af7e5da..a65604f8f2b8 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 2c5c76be18f8..b38b39c60752 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 85acab9dc6fd..2e38d1abd830 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;