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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@nxp.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2023-02-07 15:54:29 +02:00 committed by David S. Miller
parent 92f966674f
commit 4c22942734
1 changed files with 3 additions and 7 deletions
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10
net/sched/sch_taprio.c
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@ -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--;