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Date: Thu, 28 Nov 2019 14:30:48 +0800
From: Dust Li <dust.li@...ux.alibaba.com>
To: Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
John Fastabend <john.fastabend@...il.com>
Cc: Tony Lu <tonylu@...ux.alibaba.com>, netdev@...r.kernel.org
Subject: [PATCH] net: sched: keep __gnet_stats_copy_xxx() same semantics for percpu stats
__gnet_stats_copy_basic/queue() support both percpu stat and
non-percpu stat, but they are handle in a different manner:
1. For percpu stat, percpu stats are added to the return value;
2. For non-percpu stat, non-percpu stats will overwrite the
return value;
We should keep the same semantics for both type.
This patch makes percpu stats follow non-percpu's manner by
reset the return bstats before add the percpu bstats to it.
Also changes the caller in sch_mq.c/sch_mqprio.c to make sure
they dump the right statistics for percpu qdisc.
One more thing, the sch->q.qlen is not set with nonlock child
qdisc in mq_dump()/mqprio_dump(), add that.
Fixes: 22e0f8b9322c ("net: sched: make bstats per cpu and estimator RCU safe")
Signed-off-by: Dust Li <dust.li@...ux.alibaba.com>
Signed-off-by: Tony Lu <tonylu@...ux.alibaba.com>
---
net/core/gen_stats.c | 2 ++
net/sched/sch_mq.c | 34 ++++++++++++++++------------------
net/sched/sch_mqprio.c | 35 +++++++++++++++++------------------
3 files changed, 35 insertions(+), 36 deletions(-)
diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index 1d653fbfcf52..d71af69196c9 100644
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -120,6 +120,7 @@ __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
{
int i;
+ memset(bstats, 0, sizeof(*bstats));
for_each_possible_cpu(i) {
struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
unsigned int start;
@@ -288,6 +289,7 @@ __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
{
int i;
+ memset(qstats, 0, sizeof(*qstats));
for_each_possible_cpu(i) {
const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index 278c0b2dc523..b2178b7fe3a3 100644
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -131,6 +131,8 @@ static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
struct Qdisc *qdisc;
unsigned int ntx;
__u32 qlen = 0;
+ struct gnet_stats_queue qstats = {0};
+ struct gnet_stats_basic_packed bstats = {0};
sch->q.qlen = 0;
memset(&sch->bstats, 0, sizeof(sch->bstats));
@@ -145,24 +147,20 @@ static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
spin_lock_bh(qdisc_lock(qdisc));
- if (qdisc_is_percpu_stats(qdisc)) {
- qlen = qdisc_qlen_sum(qdisc);
- __gnet_stats_copy_basic(NULL, &sch->bstats,
- qdisc->cpu_bstats,
- &qdisc->bstats);
- __gnet_stats_copy_queue(&sch->qstats,
- qdisc->cpu_qstats,
- &qdisc->qstats, qlen);
- } else {
- sch->q.qlen += qdisc->q.qlen;
- sch->bstats.bytes += qdisc->bstats.bytes;
- sch->bstats.packets += qdisc->bstats.packets;
- sch->qstats.qlen += qdisc->qstats.qlen;
- sch->qstats.backlog += qdisc->qstats.backlog;
- sch->qstats.drops += qdisc->qstats.drops;
- sch->qstats.requeues += qdisc->qstats.requeues;
- sch->qstats.overlimits += qdisc->qstats.overlimits;
- }
+ qlen = qdisc_qlen_sum(qdisc);
+ __gnet_stats_copy_basic(NULL, &bstats, qdisc->cpu_bstats,
+ &qdisc->bstats);
+ __gnet_stats_copy_queue(&qstats, qdisc->cpu_qstats,
+ &qdisc->qstats, qlen);
+
+ sch->q.qlen += qdisc->q.qlen;
+ sch->bstats.bytes += bstats.bytes;
+ sch->bstats.packets += bstats.packets;
+ sch->qstats.qlen += qstats.qlen;
+ sch->qstats.backlog += qstats.backlog;
+ sch->qstats.drops += qstats.drops;
+ sch->qstats.requeues += qstats.requeues;
+ sch->qstats.overlimits += qstats.overlimits;
spin_unlock_bh(qdisc_lock(qdisc));
}
diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index 0d0113a24962..6887084bd5ad 100644
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -388,6 +388,9 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
struct tc_mqprio_qopt opt = { 0 };
struct Qdisc *qdisc;
unsigned int ntx, tc;
+ __u32 qlen = 0;
+ struct gnet_stats_queue qstats = {0};
+ struct gnet_stats_basic_packed bstats = {0};
sch->q.qlen = 0;
memset(&sch->bstats, 0, sizeof(sch->bstats));
@@ -402,24 +405,20 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
spin_lock_bh(qdisc_lock(qdisc));
- if (qdisc_is_percpu_stats(qdisc)) {
- __u32 qlen = qdisc_qlen_sum(qdisc);
-
- __gnet_stats_copy_basic(NULL, &sch->bstats,
- qdisc->cpu_bstats,
- &qdisc->bstats);
- __gnet_stats_copy_queue(&sch->qstats,
- qdisc->cpu_qstats,
- &qdisc->qstats, qlen);
- } else {
- sch->q.qlen += qdisc->q.qlen;
- sch->bstats.bytes += qdisc->bstats.bytes;
- sch->bstats.packets += qdisc->bstats.packets;
- sch->qstats.backlog += qdisc->qstats.backlog;
- sch->qstats.drops += qdisc->qstats.drops;
- sch->qstats.requeues += qdisc->qstats.requeues;
- sch->qstats.overlimits += qdisc->qstats.overlimits;
- }
+ qlen = qdisc_qlen_sum(qdisc);
+ __gnet_stats_copy_basic(NULL, &bstats, qdisc->cpu_bstats,
+ &qdisc->bstats);
+ __gnet_stats_copy_queue(&qstats, qdisc->cpu_qstats,
+ &qdisc->qstats, qlen);
+
+ sch->q.qlen += qdisc->q.qlen;
+ sch->bstats.bytes += bstats.bytes;
+ sch->bstats.packets += bstats.packets;
+ sch->qstats.qlen += qstats.qlen;
+ sch->qstats.backlog += qstats.backlog;
+ sch->qstats.drops += qstats.drops;
+ sch->qstats.requeues += qstats.requeues;
+ sch->qstats.overlimits += qstats.overlimits;
spin_unlock_bh(qdisc_lock(qdisc));
}
--
2.19.1.3.ge56e4f7
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