As MISSED and DRAINING state are used to indicate a non-empty qdisc, qdisc->empty is not longer needed, so remove it.
Signed-off-by: Yunsheng Lin linyunsheng@huawei.com --- include/net/sch_generic.h | 13 +++---------- net/sched/sch_generic.c | 3 --- 2 files changed, 3 insertions(+), 13 deletions(-)
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 0940ad56..51e74fc 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -117,8 +117,6 @@ struct Qdisc { spinlock_t busylock ____cacheline_aligned_in_smp; spinlock_t seqlock;
- /* for NOLOCK qdisc, true if there are no enqueued skbs */ - bool empty; struct rcu_head rcu;
/* private data */ @@ -160,7 +158,7 @@ static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) static inline bool qdisc_is_empty(const struct Qdisc *qdisc) { if (qdisc_is_percpu_stats(qdisc)) - return READ_ONCE(qdisc->empty); + return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY); return !READ_ONCE(qdisc->q.qlen); }
@@ -168,7 +166,7 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc) { if (qdisc->flags & TCQ_F_NOLOCK) { if (spin_trylock(&qdisc->seqlock)) - goto nolock_empty; + return true;
/* If the MISSED flag is set, it means other thread has * set the MISSED flag before second spin_trylock(), so @@ -190,12 +188,7 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc) /* Retry again in case other CPU may not see the new flag * after it releases the lock at the end of qdisc_run_end(). */ - if (!spin_trylock(&qdisc->seqlock)) - return false; - -nolock_empty: - WRITE_ONCE(qdisc->empty, false); - return true; + return spin_trylock(&qdisc->seqlock); } else if (qdisc_is_running(qdisc)) { return false; } diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 83d7f5f..1abd9c7 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -707,8 +707,6 @@ static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) need_retry = false;
goto retry; - } else { - WRITE_ONCE(qdisc->empty, true); }
return skb; @@ -909,7 +907,6 @@ 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);