linux-kernel - [PATCH RFC v1 net-next 4/4] net/sched: sch_cbq: Use Qdisc backpressure infrastructure

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Message-Id: <e9c482dd77e7788f5ec97e1c8c3ef9571741167e.1651800598.git.peilin.ye@bytedance.com>
Date:   Fri,  6 May 2022 12:45:46 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Cc:     Peilin Ye <peilin.ye@...edance.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Cong Wang <cong.wang@...edance.com>,
        Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH RFC v1 net-next 4/4] net/sched: sch_cbq: Use Qdisc backpressure infrastructure

From: Peilin Ye <peilin.ye@...edance.com>

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

Suggested-by: Cong Wang <cong.wang@...edance.com>
Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
---
 net/sched/sch_cbq.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 02d9f0dfe356..4a5204da49d0 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -382,6 +382,7 @@ cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 		return ret;
 	}
 
+	qdisc_backpressure_overlimit(sch, skb);
 	if (net_xmit_drop_count(ret)) {
 		qdisc_qstats_drop(sch);
 		cbq_mark_toplevel(q, cl);
@@ -509,6 +510,7 @@ static enum hrtimer_restart cbq_undelay(struct hrtimer *timer)
 
 		time = 0;
 		time = ktime_add_ns(time, PSCHED_TICKS2NS(now + delay));
+		qdisc_backpressure_throttle(sch);
 		hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS_PINNED);
 	}
 
@@ -851,9 +853,11 @@ cbq_dequeue(struct Qdisc *sch)
 
 	if (sch->q.qlen) {
 		qdisc_qstats_overlimit(sch);
-		if (q->wd_expires)
+		if (q->wd_expires) {
+			qdisc_backpressure_throttle(sch);
 			qdisc_watchdog_schedule(&q->watchdog,
 						now + q->wd_expires);
+		}
 	}
 	return NULL;
 }
-- 
2.20.1