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authorJarek Poplawski <jarkao2@gmail.com>2008-10-31 00:46:19 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-31 00:46:19 -0700
commit03c05f0d4bb0c267edf12d614025a40e33c5a6f9 (patch)
treec23b79ed8b7dfcdabb872f5c114541ae2de8ac0f /net/sched
parent8e3af97899db433111287e07d5105189f56fe191 (diff)
downloadlinux-2.6.38-lt-ux500-03c05f0d4bb0c267edf12d614025a40e33c5a6f9.tar.gz
pkt_sched: Use qdisc->ops->peek() instead of ->dequeue() & ->requeue()
Use qdisc->ops->peek() instead of ->dequeue() & ->requeue() pair. After this patch the only remaining user of qdisc->ops->requeue() is netem_enqueue(). Based on ideas of Herbert Xu, Patrick McHardy and David S. Miller. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_atm.c11
-rw-r--r--net/sched/sch_hfsc.c12
-rw-r--r--net/sched/sch_netem.c13
-rw-r--r--net/sched/sch_tbf.c12
4 files changed, 19 insertions, 29 deletions
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index f9eac0818d1..2ee0c1a8efa 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -480,11 +480,14 @@ static void sch_atm_dequeue(unsigned long data)
* If traffic is properly shaped, this won't generate nasty
* little bursts. Otherwise, it may ... (but that's okay)
*/
- while ((skb = flow->q->dequeue(flow->q))) {
- if (!atm_may_send(flow->vcc, skb->truesize)) {
- (void)flow->q->ops->requeue(skb, flow->q);
+ while ((skb = flow->q->ops->peek(flow->q))) {
+ if (!atm_may_send(flow->vcc, skb->truesize))
break;
- }
+
+ skb = flow->q->dequeue(flow->q);
+ if (unlikely(!skb))
+ break;
+
pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
/* remove any LL header somebody else has attached */
skb_pull(skb, skb_network_offset(skb));
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index c1e77da8cd0..ddfc4088784 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -880,28 +880,20 @@ set_passive(struct hfsc_class *cl)
*/
}
-/*
- * hack to get length of first packet in queue.
- */
static unsigned int
qdisc_peek_len(struct Qdisc *sch)
{
struct sk_buff *skb;
unsigned int len;
- skb = sch->dequeue(sch);
+ skb = sch->ops->peek(sch);
if (skb == NULL) {
if (net_ratelimit())
printk("qdisc_peek_len: non work-conserving qdisc ?\n");
return 0;
}
len = qdisc_pkt_len(skb);
- if (unlikely(sch->ops->requeue(skb, sch) != NET_XMIT_SUCCESS)) {
- if (net_ratelimit())
- printk("qdisc_peek_len: failed to requeue\n");
- qdisc_tree_decrease_qlen(sch, 1);
- return 0;
- }
+
return len;
}
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 2898d9dc31e..74fbdb52bae 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -283,25 +283,22 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
if (sch->flags & TCQ_F_THROTTLED)
return NULL;
- skb = q->qdisc->dequeue(q->qdisc);
+ skb = q->qdisc->ops->peek(q->qdisc);
if (skb) {
const struct netem_skb_cb *cb = netem_skb_cb(skb);
psched_time_t now = psched_get_time();
/* if more time remaining? */
if (cb->time_to_send <= now) {
+ skb = q->qdisc->dequeue(q->qdisc);
+ if (!skb)
+ return NULL;
+
pr_debug("netem_dequeue: return skb=%p\n", skb);
sch->q.qlen--;
return skb;
}
- if (unlikely(q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS)) {
- qdisc_tree_decrease_qlen(q->qdisc, 1);
- sch->qstats.drops++;
- printk(KERN_ERR "netem: %s could not requeue\n",
- q->qdisc->ops->id);
- }
-
qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send);
}
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 94c61598b86..61fdc77a48d 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -169,7 +169,7 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
struct tbf_sched_data *q = qdisc_priv(sch);
struct sk_buff *skb;
- skb = q->qdisc->dequeue(q->qdisc);
+ skb = q->qdisc->ops->peek(q->qdisc);
if (skb) {
psched_time_t now;
@@ -192,6 +192,10 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
toks -= L2T(q, len);
if ((toks|ptoks) >= 0) {
+ skb = q->qdisc->dequeue(q->qdisc);
+ if (unlikely(!skb))
+ return NULL;
+
q->t_c = now;
q->tokens = toks;
q->ptokens = ptoks;
@@ -214,12 +218,6 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
(cf. CSZ, HPFQ, HFSC)
*/
- if (q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS) {
- /* When requeue fails skb is dropped */
- qdisc_tree_decrease_qlen(q->qdisc, 1);
- sch->qstats.drops++;
- }
-
sch->qstats.overlimits++;
}
return NULL;