diff options
Diffstat (limited to 'net/sched/sch_multiq.c')
| -rw-r--r-- | net/sched/sch_multiq.c | 82 |
1 files changed, 39 insertions, 43 deletions
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c index 915f3149dde2..7e151861794b 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, |
