From d985bd47619d1a6bf4a7f396820105fb6ca0e7d3 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Fri, 22 Mar 2019 16:01:55 +0100 Subject: net: sched: add empty status flag for NOLOCK qdisc The queue is marked not empty after acquiring the seqlock, and it's up to the NOLOCK qdisc clearing such flag on dequeue. Since the empty status lays on the same cache-line of the seqlock, it's always hot on cache during the updates. This makes the empty flag update a little bit loosy. Given the lack of synchronization between enqueue and dequeue, this is unavoidable. v2 -> v3: - qdisc_is_empty() has a const argument (Eric) v1 -> v2: - use really an 'empty' flag instead of 'not_empty', as suggested by Eric Signed-off-by: Paolo Abeni Reviewed-by: Eric Dumazet Reviewed-by: Ivan Vecera Signed-off-by: David S. Miller --- include/net/sch_generic.h | 11 +++++++++++ net/sched/sch_generic.c | 3 +++ 2 files changed, 14 insertions(+) diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index d60dfe374728..fa28bddfba47 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -108,6 +108,9 @@ struct Qdisc { spinlock_t busylock ____cacheline_aligned_in_smp; spinlock_t seqlock; + + /* for NOLOCK qdisc, true if there are no enqueued skbs */ + bool empty; }; static inline void qdisc_refcount_inc(struct Qdisc *qdisc) @@ -124,11 +127,19 @@ static inline bool qdisc_is_running(struct Qdisc *qdisc) return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; } +static inline bool qdisc_is_empty(const struct Qdisc *qdisc) +{ + if (qdisc->flags & TCQ_F_NOLOCK) + return qdisc->empty; + return !qdisc->q.qlen; +} + static inline bool qdisc_run_begin(struct Qdisc *qdisc) { if (qdisc->flags & TCQ_F_NOLOCK) { if (!spin_trylock(&qdisc->seqlock)) return false; + qdisc->empty = false; } else if (qdisc_is_running(qdisc)) { return false; } diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 886a298445ce..6e46ebc995d0 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -666,6 +666,8 @@ static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) qdisc_qstats_cpu_backlog_dec(qdisc, skb); qdisc_bstats_cpu_update(qdisc, skb); qdisc_qstats_atomic_qlen_dec(qdisc); + } else { + qdisc->empty = true; } return skb; @@ -875,6 +877,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, sch->enqueue = ops->enqueue; sch->dequeue = ops->dequeue; sch->dev_queue = dev_queue; + sch->empty = true; dev_hold(dev); refcount_set(&sch->refcnt, 1); -- cgit v1.2.3