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pkt_sched: Simplify dev_requeue_skb and dequeue_skb 

qdisc->requeue was planned to universally replace all requeuing code,
but at the top level we never requeue more than one skb, so qdisc->
gso_skb is enough for this. qdisc->requeue would be used on the lower
levels only for one level deep requeuing (like in sch_hfsc) after
finishing all the changes.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarek Poplawski 2008-10-06 10:41:50 -07:00 committed by David S. Miller
parent 554794de79
commit 6252352d16
1 changed files with 5 additions and 16 deletions
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21
net/sched/sch_generic.c
View File

@ -44,12 +44,9 @@ static inline int qdisc_qlen(struct Qdisc *q)
static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q)
{
if (unlikely(skb->next))
q->gso_skb = skb;
else
__skb_queue_head(&q->requeue, skb);
q->gso_skb = skb;
__netif_schedule(q);
return 0;
}
@ -57,24 +54,16 @@ static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
{
struct sk_buff *skb = q->gso_skb;
if (!skb)
skb = skb_peek(&q->requeue);
if (unlikely(skb)) {
struct net_device *dev = qdisc_dev(q);
struct netdev_queue *txq;
/* check the reason of requeuing without tx lock first */
txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
if (!netif_tx_queue_stopped(txq) &&
!netif_tx_queue_frozen(txq)) {
if (q->gso_skb)
q->gso_skb = NULL;
else
__skb_unlink(skb, &q->requeue);
} else {
if (!netif_tx_queue_stopped(txq) && !netif_tx_queue_frozen(txq))
q->gso_skb = NULL;
else
skb = NULL;
}
} else {
skb = q->dequeue(q);
}