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

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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 00:45:27 -07:00 committed by David S. Miller
parent 48a8f519e0
commit 99c0db2679
2 changed files with 28 additions and 0 deletions
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12
net/sched/sch_api.c
View File

@ -102,6 +102,10 @@ static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n,
requeues once dequeued packet. It is used for non-standard or
just buggy devices, which can defer output even if netif_queue_stopped()=0.
---peek
like dequeue but without removing a packet from the queue
---reset
returns qdisc to initial state: purge all buffers, clear all
@ -149,6 +153,14 @@ int register_qdisc(struct Qdisc_ops *qops)
qops->enqueue = noop_qdisc_ops.enqueue;
if (qops->requeue == NULL)
qops->requeue = noop_qdisc_ops.requeue;
if (qops->peek == NULL) {
if (qops->dequeue == NULL) {
qops->peek = noop_qdisc_ops.peek;
} else {
rc = -EINVAL;
goto out;
}
}
if (qops->dequeue == NULL)
qops->dequeue = noop_qdisc_ops.dequeue;

16
net/sched/sch_generic.c
View File

@ -320,6 +320,7 @@ struct Qdisc_ops noop_qdisc_ops __read_mostly = {
.priv_size = 0,
.enqueue = noop_enqueue,
.dequeue = noop_dequeue,
.peek = noop_dequeue,
.requeue = noop_requeue,
.owner = THIS_MODULE,
};
@ -346,6 +347,7 @@ static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = {
.priv_size = 0,
.enqueue = noop_enqueue,
.dequeue = noop_dequeue,
.peek = noop_dequeue,
.requeue = noop_requeue,
.owner = THIS_MODULE,
};
@ -411,6 +413,19 @@ static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc)
return NULL;
}
static struct sk_buff *pfifo_fast_peek(struct Qdisc* qdisc)
{
int prio;
struct sk_buff_head *list = qdisc_priv(qdisc);
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
if (!skb_queue_empty(list + prio))
return skb_peek(list + prio);
}
return NULL;
}
static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
{
qdisc->q.qlen++;
@ -457,6 +472,7 @@ static struct Qdisc_ops pfifo_fast_ops __read_mostly = {
.priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head),
.enqueue = pfifo_fast_enqueue,
.dequeue = pfifo_fast_dequeue,
.peek = pfifo_fast_peek,
.requeue = pfifo_fast_requeue,
.init = pfifo_fast_init,
.reset = pfifo_fast_reset,