net_sched: blackhole: tell upper qdisc about dropped packets

[ 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@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sched/sch_blackhole.c b/net/sched/sch_blackhole.c
index 3fee70d9814f91f0e61d06aeecf6b1d5a6f94eeb..562edd50fa94bcb7229f61bb6c88a08f3208d0f9 100644 (file)
--- 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)