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pkt_sched: Add qdisc->ops->peek() implementation.

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Add qdisc->ops->peek() implementation for work-conserving qdiscs.
With feedback from Patrick McHardy.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarek Poplawski 2008-10-31 00:45:55 -07:00 committed by David S. Miller
parent 99c0db2679
commit 8e3af97899
8 changed files with 69 additions and 0 deletions
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10
net/sched/sch_atm.c
View file

@ -522,6 +522,15 @@ static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
return skb;
}
static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
return p->link.q->ops->peek(p->link.q);
}
static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
@ -694,6 +703,7 @@ static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct atm_qdisc_data),
.enqueue = atm_tc_enqueue,
.dequeue = atm_tc_dequeue,
.peek = atm_tc_peek,
.requeue = atm_tc_requeue,
.drop = atm_tc_drop,
.init = atm_tc_init,

1
net/sched/sch_blackhole.c
View file

@ -33,6 +33,7 @@ static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
.priv_size = 0,
.enqueue = blackhole_enqueue,
.dequeue = blackhole_dequeue,
.peek = blackhole_dequeue,
.owner = THIS_MODULE,
};

10
net/sched/sch_dsmark.c
View file

@ -313,6 +313,15 @@ static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
return skb;
}
static struct sk_buff *dsmark_peek(struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = qdisc_priv(sch);
pr_debug("dsmark_peek(sch %p,[qdisc %p])\n", sch, p);
return p->q->ops->peek(p->q);
}
static int dsmark_requeue(struct sk_buff *skb, struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = qdisc_priv(sch);
@ -496,6 +505,7 @@ static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct dsmark_qdisc_data),
.enqueue = dsmark_enqueue,
.dequeue = dsmark_dequeue,
.peek = dsmark_peek,
.requeue = dsmark_requeue,
.drop = dsmark_drop,
.init = dsmark_init,

1
net/sched/sch_gred.c
View file

@ -602,6 +602,7 @@ static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct gred_sched),
.enqueue = gred_enqueue,
.dequeue = gred_dequeue,
.peek = qdisc_peek_head,
.requeue = gred_requeue,
.drop = gred_drop,
.init = gred_init,

29
net/sched/sch_multiq.c
View file

@ -155,6 +155,34 @@ static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
}
static struct sk_buff *multiq_peek(struct Qdisc *sch)
{
struct multiq_sched_data *q = qdisc_priv(sch);
unsigned int curband = q->curband;
struct Qdisc *qdisc;
struct sk_buff *skb;
int band;
for (band = 0; band < q->bands; band++) {
/* cycle through bands to ensure fairness */
curband++;
if (curband >= q->bands)
curband = 0;
/* Check that target subqueue is available before
* pulling an skb to avoid excessive requeues
*/
if (!__netif_subqueue_stopped(qdisc_dev(sch), curband)) {
qdisc = q->queues[curband];
skb = qdisc->ops->peek(qdisc);
if (skb)
return skb;
}
}
return NULL;
}
static unsigned int multiq_drop(struct Qdisc *sch)
{
struct multiq_sched_data *q = qdisc_priv(sch);
@ -451,6 +479,7 @@ static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct multiq_sched_data),
.enqueue = multiq_enqueue,
.dequeue = multiq_dequeue,
.peek = multiq_peek,
.requeue = multiq_requeue,
.drop = multiq_drop,
.init = multiq_init,

1
net/sched/sch_netem.c
View file

@ -541,6 +541,7 @@ static struct Qdisc_ops tfifo_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct fifo_sched_data),
.enqueue = tfifo_enqueue,
.dequeue = qdisc_dequeue_head,
.peek = qdisc_peek_head,
.requeue = qdisc_requeue,
.drop = qdisc_queue_drop,
.init = tfifo_init,

9
net/sched/sch_red.c
View file

@ -140,6 +140,14 @@ static struct sk_buff * red_dequeue(struct Qdisc* sch)
return skb;
}
static struct sk_buff * red_peek(struct Qdisc* sch)
{
struct red_sched_data *q = qdisc_priv(sch);
struct Qdisc *child = q->qdisc;
return child->ops->peek(child);
}
static unsigned int red_drop(struct Qdisc* sch)
{
struct red_sched_data *q = qdisc_priv(sch);
@ -361,6 +369,7 @@ static struct Qdisc_ops red_qdisc_ops __read_mostly = {
.cl_ops = &red_class_ops,
.enqueue = red_enqueue,
.dequeue = red_dequeue,
.peek = red_peek,
.requeue = red_requeue,
.drop = red_drop,
.init = red_init,

8
net/sched/sch_teql.c
View file

@ -123,6 +123,13 @@ teql_dequeue(struct Qdisc* sch)
return skb;
}
static struct sk_buff *
teql_peek(struct Qdisc* sch)
{
/* teql is meant to be used as root qdisc */
return NULL;
}
static __inline__ void
teql_neigh_release(struct neighbour *n)
{
@ -433,6 +440,7 @@ static __init void teql_master_setup(struct net_device *dev)
ops->enqueue = teql_enqueue;
ops->dequeue = teql_dequeue;
ops->peek = teql_peek;
ops->requeue = teql_requeue;
ops->init = teql_qdisc_init;
ops->reset = teql_reset;