From: Dust Li <dust.li@xxxxxxxxxxxxxxxxx>
[ Upstream commit 14e54ab9143fa60794d13ea0a66c792a2046a8f3 ]
When a classful qdisc's child qdisc has set the flag
TCQ_F_CPUSTATS (pfifo_fast for example), the child qdisc's
cpu_bstats should be passed to gnet_stats_copy_basic(),
but many classful qdisc didn't do that. As a result,
`tc -s class show dev DEV` always return 0 for bytes and
packets in this case.
Pass the child qdisc's cpu_bstats to gnet_stats_copy_basic()
to fix this issue.
The qstats also has this problem, but it has been fixed
in 5dd431b6b9 ("net: sched: introduce and use qstats read...")
and bstats still remains buggy.
Fixes: 22e0f8b9322c ("net: sched: make bstats per cpu and estimator RCU safe")
Signed-off-by: Dust Li <dust.li@xxxxxxxxxxxxxxxxx>
Signed-off-by: Tony Lu <tonylu@xxxxxxxxxxxxxxxxx>
Acked-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sched/sch_mq.c | 3 ++-
net/sched/sch_mqprio.c | 4 ++--
net/sched/sch_multiq.c | 2 +-
net/sched/sch_prio.c | 2 +-
4 files changed, 6 insertions(+), 5 deletions(-)
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -245,7 +245,8 @@ static int mq_dump_class_stats(struct Qd
struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
sch = dev_queue->qdisc_sleeping;
- if (gnet_stats_copy_basic(&sch->running, d, NULL, &sch->bstats) < 0 ||
+ if (gnet_stats_copy_basic(&sch->running, d, sch->cpu_bstats,
+ &sch->bstats) < 0 ||
qdisc_qstats_copy(d, sch) < 0)
return -1;
return 0;
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -557,8 +557,8 @@ static int mqprio_dump_class_stats(struc
struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
sch = dev_queue->qdisc_sleeping;
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &sch->bstats) < 0 ||
+ if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), d,
+ sch->cpu_bstats, &sch->bstats) < 0 ||
qdisc_qstats_copy(d, sch) < 0)
return -1;
}
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -339,7 +339,7 @@ static int multiq_dump_class_stats(struc
cl_q = q->queues[cl - 1];
if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &cl_q->bstats) < 0 ||
+ d, cl_q->cpu_bstats, &cl_q->bstats) < 0 ||
qdisc_qstats_copy(d, cl_q) < 0)
return -1;
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -356,7 +356,7 @@ static int prio_dump_class_stats(struct
cl_q = q->queues[cl - 1];
if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &cl_q->bstats) < 0 ||
+ d, cl_q->cpu_bstats, &cl_q->bstats) < 0 ||
qdisc_qstats_copy(d, cl_q) < 0)
return -1;
