From: Dust Li dust.li@linux.alibaba.com
[ 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@linux.alibaba.com Signed-off-by: Tony Lu tonylu@linux.alibaba.com Acked-by: Cong Wang xiyou.wangcong@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/sched/sch_mq.c | 2 +- net/sched/sch_mqprio.c | 3 ++- net/sched/sch_multiq.c | 2 +- net/sched/sch_prio.c | 2 +- 4 files changed, 5 insertions(+), 4 deletions(-)
--- a/net/sched/sch_mq.c +++ b/net/sched/sch_mq.c @@ -195,7 +195,7 @@ 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(d, NULL, &sch->bstats) < 0 || + if (gnet_stats_copy_basic(d, sch->cpu_bstats, &sch->bstats) < 0 || gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0) return -1; return 0; --- a/net/sched/sch_mqprio.c +++ b/net/sched/sch_mqprio.c @@ -355,7 +355,8 @@ 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(d, NULL, &sch->bstats) < 0 || + if (gnet_stats_copy_basic(d, sch->cpu_bstats, + &sch->bstats) < 0 || gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0) return -1; --- a/net/sched/sch_multiq.c +++ b/net/sched/sch_multiq.c @@ -351,7 +351,7 @@ static int multiq_dump_class_stats(struc struct Qdisc *cl_q;
cl_q = q->queues[cl - 1]; - if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats) < 0 || + if (gnet_stats_copy_basic(d, cl_q->cpu_bstats, &cl_q->bstats) < 0 || gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0) return -1;
--- a/net/sched/sch_prio.c +++ b/net/sched/sch_prio.c @@ -319,7 +319,7 @@ static int prio_dump_class_stats(struct struct Qdisc *cl_q;
cl_q = q->queues[cl - 1]; - if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats) < 0 || + if (gnet_stats_copy_basic(d, cl_q->cpu_bstats, &cl_q->bstats) < 0 || gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0) return -1;