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fq_codel: fix memory limitation drift 

memory_usage must be decreased in dequeue_func(), not in
fq_codel_dequeue(), otherwise packets dropped by Codel algo
are missing this decrease.

Also we need to clear memory_usage in fq_codel_reset()

Fixes: 95b58430ab ("fq_codel: add memory limitation per queue")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-05-15 18:16:38 -07:00 committed by David S. Miller
parent fd24d72ca9
commit 77f5776146
1 changed files with 2 additions and 1 deletions
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3
net/sched/sch_fq_codel.c
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@ -262,6 +262,7 @@ static struct sk_buff *dequeue_func(struct codel_vars *vars, void *ctx)
if (flow->head) {
skb = dequeue_head(flow);
q->backlogs[flow - q->flows] -= qdisc_pkt_len(skb);
q->memory_usage -= skb->truesize;
sch->q.qlen--;
sch->qstats.backlog -= qdisc_pkt_len(skb);
}
@ -318,7 +319,6 @@ begin:
list_del_init(&flow->flowchain);
goto begin;
}
q->memory_usage -= skb->truesize;
qdisc_bstats_update(sch, skb);
flow->deficit -= qdisc_pkt_len(skb);
/* We cant call qdisc_tree_reduce_backlog() if our qlen is 0,
@ -355,6 +355,7 @@ static void fq_codel_reset(struct Qdisc *sch)
}
memset(q->backlogs, 0, q->flows_cnt * sizeof(u32));
sch->q.qlen = 0;
q->memory_usage = 0;
}
static const struct nla_policy fq_codel_policy[TCA_FQ_CODEL_MAX + 1] = {