net_sched: fix pfifo_head_drop behavior vs backlog
authorEric Dumazet <edumazet@google.com>
Mon, 13 Jun 2016 03:01:25 +0000 (20:01 -0700)
committerDavid S. Miller <davem@davemloft.net>
Tue, 14 Jun 2016 21:17:58 +0000 (17:17 -0400)
commit6c0d54f1897d229748d4f41ef919078db6db2123
tree966844c4135e7b6a037db8f2ad66c072b61f20fd
parent881d0327db37ad917a367c77aff1afa1ee41e0a9
net_sched: fix pfifo_head_drop behavior vs backlog

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@google.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/sched/sch_fifo.c