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Subject[PATCH RFC v1 net-next 3/4] net/sched: sch_htb: Use Qdisc backpressure infrastructure
Date
From: Peilin Ye <peilin.ye@bytedance.com>

Recently we introduced a Qdisc backpressure infrastructure for TCP and
UDP sockets. Use it in HTB.

Suggested-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
---
net/sched/sch_htb.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 23a9d6242429..21d78dff08e7 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -623,6 +623,7 @@ static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
__qdisc_enqueue_tail(skb, &q->direct_queue);
q->direct_pkts++;
} else {
+ qdisc_backpressure_overlimit(sch, skb);
return qdisc_drop(skb, sch, to_free);
}
#ifdef CONFIG_NET_CLS_ACT
@@ -634,6 +635,7 @@ static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
#endif
} else if ((ret = qdisc_enqueue(skb, cl->leaf.q,
to_free)) != NET_XMIT_SUCCESS) {
+ qdisc_backpressure_overlimit(sch, skb);
if (net_xmit_drop_count(ret)) {
qdisc_qstats_drop(sch);
cl->drops++;
@@ -978,6 +980,9 @@ static struct sk_buff *htb_dequeue(struct Qdisc *sch)
goto ok;
}
}
+
+ qdisc_backpressure_throttle(sch);
+
if (likely(next_event > q->now))
qdisc_watchdog_schedule_ns(&q->watchdog, next_event);
else
--
2.20.1
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