pkt_sched: Check the state of tx_queue in dequeue_skb()
Check in dequeue_skb() the state of tx_queue for requeued skb to save on locking and re-requeuing, and possibly remove the current check in qdisc_run(). Based on the idea of Alexander Duyck. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -52,11 +52,21 @@ static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q)
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static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
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{
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struct sk_buff *skb;
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struct sk_buff *skb = skb_peek(&q->requeue);
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skb = __skb_dequeue(&q->requeue);
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if (!skb)
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if (unlikely(skb)) {
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struct net_device *dev = qdisc_dev(q);
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struct netdev_queue *txq;
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/* check the reason of requeuing without tx lock first */
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txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
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if (!netif_tx_queue_stopped(txq) && !netif_tx_queue_frozen(txq))
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__skb_unlink(skb, &q->requeue);
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else
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skb = NULL;
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} else {
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skb = q->dequeue(q);
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}
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return skb;
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}
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