From 13511704f8d7591faf19fdb84f0902dff0535ccb Mon Sep 17 00:00:00 2001 From: Yannick Vignon Date: Tue, 11 May 2021 19:18:29 +0200 Subject: [PATCH] net: taprio offload: enforce qdisc to netdev queue mapping Even though the taprio qdisc is designed for multiqueue devices, all the queues still point to the same top-level taprio qdisc. This works and is probably required for software taprio, but at least with offload taprio, it has an undesirable side effect: because the whole qdisc is run when a packet has to be sent, it allows packets in a best-effort class to be processed in the context of a task sending higher priority traffic. If there are packets left in the qdisc after that first run, the NET_TX softirq is raised and gets executed immediately in the same process context. As with any other softirq, it runs up to 10 times and for up to 2ms, during which the calling process is waiting for the sendmsg call (or similar) to return. In my use case, that calling process is a real-time task scheduled to send a packet every 2ms, so the long sendmsg calls are leading to missed timeslots. By attaching each netdev queue to its own qdisc, as it is done with the "classic" mq qdisc, each traffic class can be processed independently without touching the other classes. A high-priority process can then send packets without getting stuck in the sendmsg call anymore. Signed-off-by: Yannick Vignon Signed-off-by: David S. Miller --- net/sched/sch_taprio.c | 85 ++++++++++++++++++++++-------------------- 1 file changed, 45 insertions(+), 40 deletions(-) diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index 71e8a7a84841..66fe2b82af9a 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -435,6 +435,11 @@ static int taprio_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct Qdisc *child; int queue; + if (unlikely(FULL_OFFLOAD_IS_ENABLED(q->flags))) { + WARN_ONCE(1, "Trying to enqueue skb into the root of a taprio qdisc configured with full offload\n"); + return qdisc_drop(skb, sch, to_free); + } + queue = skb_get_queue_mapping(skb); child = q->qdiscs[queue]; @@ -526,23 +531,7 @@ static struct sk_buff *taprio_peek_soft(struct Qdisc *sch) static struct sk_buff *taprio_peek_offload(struct Qdisc *sch) { - struct taprio_sched *q = qdisc_priv(sch); - struct net_device *dev = qdisc_dev(sch); - struct sk_buff *skb; - int i; - - for (i = 0; i < dev->num_tx_queues; i++) { - struct Qdisc *child = q->qdiscs[i]; - - if (unlikely(!child)) - continue; - - skb = child->ops->peek(child); - if (!skb) - continue; - - return skb; - } + WARN_ONCE(1, "Trying to peek into the root of a taprio qdisc configured with full offload\n"); return NULL; } @@ -651,27 +640,7 @@ done: static struct sk_buff *taprio_dequeue_offload(struct Qdisc *sch) { - struct taprio_sched *q = qdisc_priv(sch); - struct net_device *dev = qdisc_dev(sch); - struct sk_buff *skb; - int i; - - for (i = 0; i < dev->num_tx_queues; i++) { - struct Qdisc *child = q->qdiscs[i]; - - if (unlikely(!child)) - continue; - - skb = child->ops->dequeue(child); - if (unlikely(!skb)) - continue; - - qdisc_bstats_update(sch, skb); - qdisc_qstats_backlog_dec(sch, skb); - sch->q.qlen--; - - return skb; - } + WARN_ONCE(1, "Trying to dequeue from the root of a taprio qdisc configured with full offload\n"); return NULL; } @@ -1756,6 +1725,37 @@ static int taprio_init(struct Qdisc *sch, struct nlattr *opt, return taprio_change(sch, opt, extack); } +static void taprio_attach(struct Qdisc *sch) +{ + struct taprio_sched *q = qdisc_priv(sch); + struct net_device *dev = qdisc_dev(sch); + unsigned int ntx; + + /* Attach underlying qdisc */ + for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { + struct Qdisc *qdisc = q->qdiscs[ntx]; + struct Qdisc *old; + + if (FULL_OFFLOAD_IS_ENABLED(q->flags)) { + qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; + old = dev_graft_qdisc(qdisc->dev_queue, qdisc); + if (ntx < dev->real_num_tx_queues) + qdisc_hash_add(qdisc, false); + } else { + old = dev_graft_qdisc(qdisc->dev_queue, sch); + qdisc_refcount_inc(sch); + } + if (old) + qdisc_put(old); + } + + /* access to the child qdiscs is not needed in offload mode */ + if (FULL_OFFLOAD_IS_ENABLED(q->flags)) { + kfree(q->qdiscs); + q->qdiscs = NULL; + } +} + static struct netdev_queue *taprio_queue_get(struct Qdisc *sch, unsigned long cl) { @@ -1782,8 +1782,12 @@ static int taprio_graft(struct Qdisc *sch, unsigned long cl, if (dev->flags & IFF_UP) dev_deactivate(dev); - *old = q->qdiscs[cl - 1]; - q->qdiscs[cl - 1] = new; + if (FULL_OFFLOAD_IS_ENABLED(q->flags)) { + *old = dev_graft_qdisc(dev_queue, new); + } else { + *old = q->qdiscs[cl - 1]; + q->qdiscs[cl - 1] = new; + } if (new) new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; @@ -2017,6 +2021,7 @@ static struct Qdisc_ops taprio_qdisc_ops __read_mostly = { .change = taprio_change, .destroy = taprio_destroy, .reset = taprio_reset, + .attach = taprio_attach, .peek = taprio_peek, .dequeue = taprio_dequeue, .enqueue = taprio_enqueue,