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Diffstat (limited to 'net/sched/sch_multiq.c')
-rw-r--r--net/sched/sch_multiq.c82
1 files changed, 39 insertions, 43 deletions
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index 915f3149dde..7e151861794 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -92,40 +92,6 @@ multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
return ret;
}
-
-static int
-multiq_requeue(struct sk_buff *skb, struct Qdisc *sch)
-{
- struct Qdisc *qdisc;
- struct multiq_sched_data *q = qdisc_priv(sch);
- int ret;
-
- qdisc = multiq_classify(skb, sch, &ret);
-#ifdef CONFIG_NET_CLS_ACT
- if (qdisc == NULL) {
- if (ret & __NET_XMIT_BYPASS)
- sch->qstats.drops++;
- kfree_skb(skb);
- return ret;
- }
-#endif
-
- ret = qdisc->ops->requeue(skb, qdisc);
- if (ret == NET_XMIT_SUCCESS) {
- sch->q.qlen++;
- sch->qstats.requeues++;
- if (q->curband)
- q->curband--;
- else
- q->curband = q->bands - 1;
- return NET_XMIT_SUCCESS;
- }
- if (net_xmit_drop_count(ret))
- sch->qstats.drops++;
- return ret;
-}
-
-
static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
{
struct multiq_sched_data *q = qdisc_priv(sch);
@@ -140,7 +106,7 @@ static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
q->curband = 0;
/* Check that target subqueue is available before
- * pulling an skb to avoid excessive requeues
+ * pulling an skb to avoid head-of-line blocking.
*/
if (!__netif_subqueue_stopped(qdisc_dev(sch), q->curband)) {
qdisc = q->queues[q->curband];
@@ -155,6 +121,34 @@ 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 head-of-line blocking.
+ */
+ 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);
@@ -220,7 +214,8 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
q->bands = qopt->bands;
for (i = q->bands; i < q->max_bands; i++) {
if (q->queues[i] != &noop_qdisc) {
- struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
+ struct Qdisc *child = q->queues[i];
+ q->queues[i] = &noop_qdisc;
qdisc_tree_decrease_qlen(child, child->q.qlen);
qdisc_destroy(child);
}
@@ -230,7 +225,7 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
for (i = 0; i < q->bands; i++) {
if (q->queues[i] == &noop_qdisc) {
- struct Qdisc *child;
+ struct Qdisc *child, *old;
child = qdisc_create_dflt(qdisc_dev(sch),
sch->dev_queue,
&pfifo_qdisc_ops,
@@ -238,12 +233,13 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
i + 1));
if (child) {
sch_tree_lock(sch);
- child = xchg(&q->queues[i], child);
+ old = q->queues[i];
+ q->queues[i] = child;
- if (child != &noop_qdisc) {
- qdisc_tree_decrease_qlen(child,
- child->q.qlen);
- qdisc_destroy(child);
+ if (old != &noop_qdisc) {
+ qdisc_tree_decrease_qlen(old,
+ old->q.qlen);
+ qdisc_destroy(old);
}
sch_tree_unlock(sch);
}
@@ -451,7 +447,7 @@ static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct multiq_sched_data),
.enqueue = multiq_enqueue,
.dequeue = multiq_dequeue,
- .requeue = multiq_requeue,
+ .peek = multiq_peek,
.drop = multiq_drop,
.init = multiq_init,
.reset = multiq_reset,