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Message-Id: <20230207135440.1482856-5-vladimir.oltean@nxp.com>
Date: Tue, 7 Feb 2023 15:54:29 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
Vinicius Costa Gomes <vinicius.gomes@...el.com>,
Kurt Kanzenbach <kurt@...utronix.de>,
Jacob Keller <jacob.e.keller@...el.com>,
Gerhard Engleder <gerhard@...leder-embedded.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 net-next 04/15] net/sched: taprio: avoid calling child->ops->dequeue(child) twice
Simplify taprio_dequeue_from_txq() by noticing that we can goto one call
earlier than the previous skb_found label. This is possible because
we've unified the treatment of the child->ops->dequeue(child) return
call, we always try other TXQs now, instead of abandoning the root
dequeue completely if we failed in the peek() case.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>
---
v1->v2: none
net/sched/sch_taprio.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 272a8b7c0f9f..a3770d599a84 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -528,12 +528,8 @@ static struct sk_buff *taprio_dequeue_from_txq(struct Qdisc *sch, int txq,
if (unlikely(!child))
return NULL;
- if (TXTIME_ASSIST_IS_ENABLED(q->flags)) {
- skb = child->ops->dequeue(child);
- if (!skb)
- return NULL;
- goto skb_found;
- }
+ if (TXTIME_ASSIST_IS_ENABLED(q->flags))
+ goto skip_peek_checks;
skb = child->ops->peek(child);
if (!skb)
@@ -560,11 +556,11 @@ static struct sk_buff *taprio_dequeue_from_txq(struct Qdisc *sch, int txq,
atomic_sub_return(len, &entry->budget) < 0)
return NULL;
+skip_peek_checks:
skb = child->ops->dequeue(child);
if (unlikely(!skb))
return NULL;
-skb_found:
qdisc_bstats_update(sch, skb);
qdisc_qstats_backlog_dec(sch, skb);
sch->q.qlen--;
--
2.34.1
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