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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Jamal Hadi Salim <jhs@mojatatu.com>,
	Cong Wang <xiyou.wangcong@gmail.com>,
	Jiri Pirko <jiri@resnulli.us>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Ahmed S. Darwish" <a.darwish@linutronix.de>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH net-next 4/4] mq, mqprio: Simplify stats copy.
Date: Thu,  7 Oct 2021 19:50:00 +0200	[thread overview]
Message-ID: <20211007175000.2334713-5-bigeasy@linutronix.de> (raw)
In-Reply-To: <20211007175000.2334713-1-bigeasy@linutronix.de>

__gnet_stats_copy_basic() and __gnet_stats_copy_queue() update the
statistics and don't overwritte them for both: global and per-CPU
statistics.

Simplify the code by removing the else case.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---

Could someone please double check if the qdisc_qlen_sum() for
!qdisc_is_percpu_stats() is correct here? I would lke not break it again
in another way ;)

 net/sched/sch_mq.c     | 27 ++++++---------------
 net/sched/sch_mqprio.c | 55 +++++++++++++-----------------------------
 2 files changed, 25 insertions(+), 57 deletions(-)

diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index e79f1afe0cfd6..9aa9534f62ff5 100644
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -145,26 +145,15 @@ 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);
-			sch->q.qlen		+= 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, &sch->bstats,
+					qdisc->cpu_bstats,
+					&qdisc->bstats);
+		__gnet_stats_copy_queue(&sch->qstats,
+					qdisc->cpu_qstats,
+					&qdisc->qstats, qlen);
+		sch->q.qlen		+= qlen;
 		spin_unlock_bh(qdisc_lock(qdisc));
 	}
 
diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index 5eb3b1b7ae5e7..8e57c4a3545ee 100644
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -399,28 +399,18 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
 	 * qdisc totals are added at end.
 	 */
 	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
+		u32 qlen = qdisc_qlen_sum(qdisc);
+
 		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);
-			sch->q.qlen		+= 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;
-		}
+		__gnet_stats_copy_basic(NULL, &sch->bstats,
+					qdisc->cpu_bstats,
+					&qdisc->bstats);
+		__gnet_stats_copy_queue(&sch->qstats,
+					qdisc->cpu_qstats,
+					&qdisc->qstats, qlen);
+		sch->q.qlen		+= qlen;
 
 		spin_unlock_bh(qdisc_lock(qdisc));
 	}
@@ -532,25 +522,14 @@ static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
 
 			spin_lock_bh(qdisc_lock(qdisc));
 
-			if (qdisc_is_percpu_stats(qdisc)) {
-				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);
-			} else {
-				qlen		+= qdisc->q.qlen;
-				bstats.bytes	+= qdisc->bstats.bytes;
-				bstats.packets	+= qdisc->bstats.packets;
-				qstats.backlog	+= qdisc->qstats.backlog;
-				qstats.drops	+= qdisc->qstats.drops;
-				qstats.requeues	+= qdisc->qstats.requeues;
-				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);
 			spin_unlock_bh(qdisc_lock(qdisc));
 		}
 
-- 
2.33.0


      parent reply	other threads:[~2021-10-07 17:51 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-07 17:49 [PATCH 0/4] mqprio fixup and simplify code Sebastian Andrzej Siewior
2021-10-07 17:49 ` [PATCH net 1/4] mqprio: Correct stats in mqprio_dump_class_stats() Sebastian Andrzej Siewior
2021-10-08 23:33   ` Jakub Kicinski
2021-10-07 17:49 ` [PATCH net-next 2/4] gen_stats: Add instead Set the value in __gnet_stats_copy_basic() Sebastian Andrzej Siewior
2021-10-08 23:35   ` Jakub Kicinski
2021-10-13 16:34   ` Cong Wang
2021-10-07 17:49 ` [PATCH net-next 3/4] gen_stats: Add instead Set the value in __gnet_stats_copy_queue() Sebastian Andrzej Siewior
2021-10-08 23:38   ` Jakub Kicinski
2021-10-13 16:00     ` Sebastian Andrzej Siewior
2021-10-07 17:50 ` Sebastian Andrzej Siewior [this message]

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