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net_sched: sch_htb: add per class overlimits counter

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HTB qdisc overlimits counter is properly increased, but we have no per
class counter, meaning it is difficult to diagnose HTB problems.

This patch adds this counter, visible in "tc -s class show dev eth0",
with current iproute2.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Denys Fedoryshchenko <nuclearcat@nuclearcat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-09-18 12:36:22 -07:00 committed by David S. Miller
parent 7e5dd53f6e
commit 3c75f6ee13
1 changed files with 5 additions and 0 deletions
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5
net/sched/sch_htb.c
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@ -142,6 +142,7 @@ struct htb_class {
struct rb_node node[TC_HTB_NUMPRIO]; /* node for self or feed tree */
unsigned int drops ____cacheline_aligned_in_smp;
unsigned int overlimits;
};
struct htb_level {
@ -533,6 +534,9 @@ htb_change_class_mode(struct htb_sched *q, struct htb_class *cl, s64 *diff)
if (new_mode == cl->cmode)
return;
if (new_mode == HTB_CANT_SEND)
cl->overlimits++;
if (cl->prio_activity) { /* not necessary: speed optimization */
if (cl->cmode != HTB_CANT_SEND)
htb_deactivate_prios(q, cl);
@ -1143,6 +1147,7 @@ htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d)
struct htb_class *cl = (struct htb_class *)arg;
struct gnet_stats_queue qs = {
.drops = cl->drops,
.overlimits = cl->overlimits,
};
__u32 qlen = 0;