4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
[ Upstream commit 7e85dc8cb35abf16455f1511f0670b57c1a84608 ]
When blackhole is used on top of classful qdisc like hfsc it breaks
qlen and backlog counters because packets are disappear without notice.
In HFSC non-zero qlen while all classes are inactive triggers warning:
WARNING: ... at net/sched/sch_hfsc.c:1393 hfsc_dequeue+0xba4/0xe90 [sch_hfsc]
and schedules watchdog work endlessly.
This patch return __NET_XMIT_BYPASS in addition to NET_XMIT_SUCCESS,
this flag tells upper layer: this packet is gone and isn't queued.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sched/sch_blackhole.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/sched/sch_blackhole.c
+++ b/net/sched/sch_blackhole.c
@@ -20,7 +20,7 @@
static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
qdisc_drop(skb, sch);
- return NET_XMIT_SUCCESS;
+ return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
}
static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
