netdev - [PATCH net] net_sched: fix pfifo_head

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Message-ID: <1465786885.7945.140.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Sun, 12 Jun 2016 20:01:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Jamal Hadi Salim <jhs@...atatu.com>
Subject: [PATCH net] net_sched: fix pfifo_head_drop behavior vs backlog

From: Eric Dumazet <edumazet@...gle.com>

When the qdisc is full, we drop a packet at the head of the queue,
queue the current skb and return NET_XMIT_CN

Now we track backlog on upper qdiscs, we need to call
qdisc_tree_reduce_backlog(), even if the qlen did not change.

Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: WANG Cong <xiyou.wangcong@...il.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
---
 net/sched/sch_fifo.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c
index 2177eac0a61e..2e4bd2c0a50c 100644
--- a/net/sched/sch_fifo.c
+++ b/net/sched/sch_fifo.c
@@ -37,14 +37,18 @@ static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 
 static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 {
+	unsigned int prev_backlog;
+
 	if (likely(skb_queue_len(&sch->q) < sch->limit))
 		return qdisc_enqueue_tail(skb, sch);
 
+	prev_backlog = sch->qstats.backlog;
 	/* queue full, remove one skb to fulfill the limit */
 	__qdisc_queue_drop_head(sch, &sch->q);
 	qdisc_qstats_drop(sch);
 	qdisc_enqueue_tail(skb, sch);
 
+	qdisc_tree_reduce_backlog(sch, 0, prev_backlog - sch->qstats.backlog);
 	return NET_XMIT_CN;
 }