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Date: Sat, 16 Oct 2021 10:49:02 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
"Ahmed S. Darwish" <a.darwish@...utronix.de>,
Eric Dumazet <edumazet@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH net-next 1/9] gen_stats: Add instead Set the value in __gnet_stats_copy_basic().
__gnet_stats_copy_basic() always assigns the value to the bstats
argument overwriting the previous value. The later added per-CPU version
always accumulated the values in the returning gnet_stats_basic_packed
argument.
Based on review there are five users of that function as of today:
- est_fetch_counters(), ___gnet_stats_copy_basic()
memsets() bstats to zero, single invocation.
- mq_dump(), mqprio_dump(), mqprio_dump_class_stats()
memsets() bstats to zero, multiple invocation but does not use the
function due to !qdisc_is_percpu_stats().
Add the values in __gnet_stats_copy_basic() instead overwriting. Rename
the function to gnet_stats_add_basic() to make it more obvious.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
include/net/gen_stats.h | 8 ++++----
net/core/gen_estimator.c | 2 +-
net/core/gen_stats.c | 29 ++++++++++++++++-------------
net/sched/sch_mq.c | 5 ++---
net/sched/sch_mqprio.c | 11 +++++------
5 files changed, 28 insertions(+), 27 deletions(-)
diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
index 1424e02cef90c..25740d004bdb0 100644
--- a/include/net/gen_stats.h
+++ b/include/net/gen_stats.h
@@ -46,10 +46,10 @@ int gnet_stats_copy_basic(const seqcount_t *running,
struct gnet_dump *d,
struct gnet_stats_basic_cpu __percpu *cpu,
struct gnet_stats_basic_packed *b);
-void __gnet_stats_copy_basic(const seqcount_t *running,
- struct gnet_stats_basic_packed *bstats,
- struct gnet_stats_basic_cpu __percpu *cpu,
- struct gnet_stats_basic_packed *b);
+void gnet_stats_add_basic(const seqcount_t *running,
+ struct gnet_stats_basic_packed *bstats,
+ struct gnet_stats_basic_cpu __percpu *cpu,
+ struct gnet_stats_basic_packed *b);
int gnet_stats_copy_basic_hw(const seqcount_t *running,
struct gnet_dump *d,
struct gnet_stats_basic_cpu __percpu *cpu,
diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index 8e582e29a41e3..205df8b5116e5 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -66,7 +66,7 @@ static void est_fetch_counters(struct net_rate_estimator *e,
if (e->stats_lock)
spin_lock(e->stats_lock);
- __gnet_stats_copy_basic(e->running, b, e->cpu_bstats, e->bstats);
+ gnet_stats_add_basic(e->running, b, e->cpu_bstats, e->bstats);
if (e->stats_lock)
spin_unlock(e->stats_lock);
diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index e491b083b3485..25d7c0989b83f 100644
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -114,9 +114,8 @@ gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
}
EXPORT_SYMBOL(gnet_stats_start_copy);
-static void
-__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
- struct gnet_stats_basic_cpu __percpu *cpu)
+static void gnet_stats_add_basic_cpu(struct gnet_stats_basic_packed *bstats,
+ struct gnet_stats_basic_cpu __percpu *cpu)
{
int i;
@@ -136,26 +135,30 @@ __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
}
}
-void
-__gnet_stats_copy_basic(const seqcount_t *running,
- struct gnet_stats_basic_packed *bstats,
- struct gnet_stats_basic_cpu __percpu *cpu,
- struct gnet_stats_basic_packed *b)
+void gnet_stats_add_basic(const seqcount_t *running,
+ struct gnet_stats_basic_packed *bstats,
+ struct gnet_stats_basic_cpu __percpu *cpu,
+ struct gnet_stats_basic_packed *b)
{
unsigned int seq;
+ u64 bytes = 0;
+ u64 packets = 0;
if (cpu) {
- __gnet_stats_copy_basic_cpu(bstats, cpu);
+ gnet_stats_add_basic_cpu(bstats, cpu);
return;
}
do {
if (running)
seq = read_seqcount_begin(running);
- bstats->bytes = b->bytes;
- bstats->packets = b->packets;
+ bytes = b->bytes;
+ packets = b->packets;
} while (running && read_seqcount_retry(running, seq));
+
+ bstats->bytes += bytes;
+ bstats->packets += packets;
}
-EXPORT_SYMBOL(__gnet_stats_copy_basic);
+EXPORT_SYMBOL(gnet_stats_add_basic);
static int
___gnet_stats_copy_basic(const seqcount_t *running,
@@ -166,7 +169,7 @@ ___gnet_stats_copy_basic(const seqcount_t *running,
{
struct gnet_stats_basic_packed bstats = {0};
- __gnet_stats_copy_basic(running, &bstats, cpu, b);
+ gnet_stats_add_basic(running, &bstats, cpu, b);
if (d->compat_tc_stats && type == TCA_STATS_BASIC) {
d->tc_stats.bytes = bstats.bytes;
diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index e04f1a87642b9..1edd98a50e33d 100644
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -147,9 +147,8 @@ static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
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_add_basic(NULL, &sch->bstats,
+ qdisc->cpu_bstats, &qdisc->bstats);
__gnet_stats_copy_queue(&sch->qstats,
qdisc->cpu_qstats,
&qdisc->qstats, qlen);
diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index e1904e62425e5..4bae601e15e1e 100644
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -405,9 +405,8 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
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_add_basic(NULL, &sch->bstats,
+ qdisc->cpu_bstats, &qdisc->bstats);
__gnet_stats_copy_queue(&sch->qstats,
qdisc->cpu_qstats,
&qdisc->qstats, qlen);
@@ -535,9 +534,9 @@ static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
if (qdisc_is_percpu_stats(qdisc)) {
qlen = qdisc_qlen_sum(qdisc);
- __gnet_stats_copy_basic(NULL, &bstats,
- qdisc->cpu_bstats,
- &qdisc->bstats);
+ gnet_stats_add_basic(NULL, &bstats,
+ qdisc->cpu_bstats,
+ &qdisc->bstats);
__gnet_stats_copy_queue(&qstats,
qdisc->cpu_qstats,
&qdisc->qstats,
--
2.33.0
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