kernel: fq_codel: dont reinit flow state

Keep fq_codel flow state around after queue empty.

SVN-Revision: 33687

target/linux/generic/patches-3.3/061-fq_codel-dont-reinit-flow-state.patch

@@ -0,0 +1,41 @@
+From b379135c40163ae79ba7a54e6928b53983e74ee8 Mon Sep 17 00:00:00 2001
+From: Eric Dumazet <eric.dumazet@gmail.com>
+Date: Sat, 1 Sep 2012 03:19:57 +0000
+Subject: [PATCH 307/558] fq_codel: dont reinit flow state
+
+When fq_codel builds a new flow, it should not reset codel state.
+
+Codel algo needs to get previous values (lastcount, drop_next) to get
+proper behavior.
+
+Signed-off-by: Dave Taht <dave.taht@gmail.com>
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+Acked-by: Dave Taht <dave.taht@bufferbloat.net>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/sched/sch_fq_codel.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
+index 9fc1c62..4e606fc 100644
+--- a/net/sched/sch_fq_codel.c
++++ b/net/sched/sch_fq_codel.c
+@@ -191,7 +191,6 @@ static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch)
+ 
+ 	if (list_empty(&flow->flowchain)) {
+ 		list_add_tail(&flow->flowchain, &q->new_flows);
+-		codel_vars_init(&flow->cvars);
+ 		q->new_flow_count++;
+ 		flow->deficit = q->quantum;
+ 		flow->dropped = 0;
+@@ -418,6 +417,7 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt)
+ 			struct fq_codel_flow *flow = q->flows + i;
+ 
+ 			INIT_LIST_HEAD(&flow->flowchain);
++			codel_vars_init(&flow->cvars);
+ 		}
+ 	}
+ 	if (sch->limit >= 1)
+-- 
+1.7.9.5
+