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[PKT_SCHED]: netetm: adjust parent qlen when duplicating

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Fix qlen underrun when doing duplication with netem. If netem is used
as leaf discipline, then the parent needs to be tweaked when packets
are duplicated.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2005-05-03 16:24:57 -07:00
committed by David S. Miller
부모 771018e76a
커밋 d5d75cd6b1
2개의 변경된 파일과 16개의 추가작업 그리고 5개의 파일을 삭제
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1
net/sched/sch_api.c
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@@ -1289,6 +1289,7 @@ static int __init pktsched_init(void)
subsys_initcall(pktsched_init);
EXPORT_SYMBOL(qdisc_lookup);
EXPORT_SYMBOL(qdisc_get_rtab);
EXPORT_SYMBOL(qdisc_put_rtab);
EXPORT_SYMBOL(register_qdisc);

20
net/sched/sch_netem.c
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@@ -206,7 +206,6 @@ static int netem_run(struct Qdisc *sch)
static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
struct netem_sched_data *q = qdisc_priv(sch);
struct sk_buff *skb2;
int ret;
pr_debug("netem_enqueue skb=%p\n", skb);
@@ -220,11 +219,21 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
}
/* Random duplication */
if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor)
&& (skb2 = skb_clone(skb, GFP_ATOMIC)) != NULL) {
pr_debug("netem_enqueue: dup %p\n", skb2);
if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor)) {
struct sk_buff *skb2;
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2 && netem_delay(sch, skb2) == NET_XMIT_SUCCESS) {
struct Qdisc *qp;
/* Since one packet can generate two packets in the
* queue, the parent's qlen accounting gets confused,
* so fix it.
*/
qp = qdisc_lookup(sch->dev, TC_H_MAJ(sch->parent));
if (qp)
qp->q.qlen++;
if (netem_delay(sch, skb2)) {
sch->q.qlen++;
sch->bstats.bytes += skb2->len;
sch->bstats.packets++;
@@ -253,6 +262,7 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
} else
sch->qstats.drops++;
pr_debug("netem: enqueue ret %d\n", ret);
return ret;
}