pkt_sched: avoid requeues if possible
With BQL being deployed, we can more likely have following behavior : We dequeue a packet from qdisc in dequeue_skb(), then we realize target tx queue is in XOFF state in sch_direct_xmit(), and we have to hold the skb into gso_skb for later. This shows in stats (tc -s qdisc dev eth0) as requeues. Problem of these requeues is that high priority packets can not be dequeued as long as this (possibly low prio and big TSO packet) is not removed from gso_skb. At 1Gbps speed, a full size TSO packet is 500 us of extra latency. In some cases, we know that all packets dequeued from a qdisc are for a particular and known txq : - If device is non multi queue - For all MQ/MQPRIO slave qdiscs This patch introduces a new qdisc flag, TCQ_F_ONETXQUEUE to mark this capability, so that dequeue_skb() is allowed to dequeue a packet only if the associated txq is not stopped. This indeed reduce latencies for high prio packets (or improve fairness with sfq/fq_codel), and almost remove qdisc 'requeues'. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -50,6 +50,13 @@ struct Qdisc {
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#define TCQ_F_INGRESS 2
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#define TCQ_F_CAN_BYPASS 4
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#define TCQ_F_MQROOT 8
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#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
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* q->dev_queue : It can test
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* netif_xmit_frozen_or_stopped() before
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* dequeueing next packet.
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* Its true for MQ/MQPRIO slaves, or non
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* multiqueue device.
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*/
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#define TCQ_F_WARN_NONWC (1 << 16)
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int padded;
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const struct Qdisc_ops *ops;
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@ -833,6 +833,8 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
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goto err_out3;
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}
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lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
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if (!netif_is_multiqueue(dev))
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sch->flags |= TCQ_F_ONETXQUEUE;
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}
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sch->handle = handle;
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@ -53,20 +53,19 @@ 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 = q->gso_skb;
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const struct netdev_queue *txq = q->dev_queue;
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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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txq = netdev_get_tx_queue(txq->dev, skb_get_queue_mapping(skb));
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if (!netif_xmit_frozen_or_stopped(txq)) {
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q->gso_skb = NULL;
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q->q.qlen--;
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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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if (!(q->flags & TCQ_F_ONETXQUEUE) || !netif_xmit_frozen_or_stopped(txq))
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skb = q->dequeue(q);
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}
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return skb;
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@ -686,6 +685,8 @@ static void attach_one_default_qdisc(struct net_device *dev,
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netdev_info(dev, "activation failed\n");
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return;
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}
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if (!netif_is_multiqueue(dev))
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qdisc->flags |= TCQ_F_ONETXQUEUE;
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}
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dev_queue->qdisc_sleeping = qdisc;
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}
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@ -63,6 +63,7 @@ static int mq_init(struct Qdisc *sch, struct nlattr *opt)
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if (qdisc == NULL)
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goto err;
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priv->qdiscs[ntx] = qdisc;
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qdisc->flags |= TCQ_F_ONETXQUEUE;
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}
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sch->flags |= TCQ_F_MQROOT;
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@ -150,7 +151,8 @@ static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
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dev_deactivate(dev);
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*old = dev_graft_qdisc(dev_queue, new);
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if (new)
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new->flags |= TCQ_F_ONETXQUEUE;
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if (dev->flags & IFF_UP)
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dev_activate(dev);
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return 0;
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@ -132,6 +132,7 @@ static int mqprio_init(struct Qdisc *sch, struct nlattr *opt)
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goto err;
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}
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priv->qdiscs[i] = qdisc;
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qdisc->flags |= TCQ_F_ONETXQUEUE;
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}
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/* If the mqprio options indicate that hardware should own
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@ -205,6 +206,9 @@ static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
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*old = dev_graft_qdisc(dev_queue, new);
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if (new)
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new->flags |= TCQ_F_ONETXQUEUE;
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if (dev->flags & IFF_UP)
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dev_activate(dev);
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