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Commit 99c0db26 authored by Jarek Poplawski's avatar Jarek Poplawski Committed by David S. Miller
Browse files

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



With feedback from Patrick McHardy.

Signed-off-by: default avatarJarek Poplawski <jarkao2@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 48a8f519

net/sched/sch_api.c

+12 −0
Original line number Diff line number Diff line
@@ -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;

net/sched/sch_generic.c

+16 −0
Original line number Diff line number Diff line
@@ -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,