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sched: replace __QDISC_STATE_RUNNING bit with a spin lock

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So that we can use lockdep on it.
The newly introduced sequence lock has the same scope of busylock,
so it shares the same lockdep annotation, but it's only used for
NOLOCK qdiscs.

With this changeset we acquire such lock in the control path around
flushing operation (qdisc reset), to allow more NOLOCK qdisc perf
improvement in the next patch.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2018-05-15 16:24:36 +02:00 committed by David S. Miller
parent b9f672af14
commit 96009c7d50
2 changed files with 16 additions and 5 deletions
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10
include/net/sch_generic.h
View File

@ -30,7 +30,6 @@ struct qdisc_rate_table {
enum qdisc_state_t {
__QDISC_STATE_SCHED,
__QDISC_STATE_DEACTIVATED,
__QDISC_STATE_RUNNING,
};
struct qdisc_size_table {
@ -102,6 +101,7 @@ struct Qdisc {
refcount_t refcnt;
spinlock_t busylock ____cacheline_aligned_in_smp;
spinlock_t seqlock;
};
static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
@ -111,17 +111,17 @@ static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
refcount_inc(&qdisc->refcnt);
}
static inline bool qdisc_is_running(const struct Qdisc *qdisc)
static inline bool qdisc_is_running(struct Qdisc *qdisc)
{
if (qdisc->flags & TCQ_F_NOLOCK)
return test_bit(__QDISC_STATE_RUNNING, &qdisc->state);
return spin_is_locked(&qdisc->seqlock);
return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
}
static inline bool qdisc_run_begin(struct Qdisc *qdisc)
{
if (qdisc->flags & TCQ_F_NOLOCK) {
if (test_and_set_bit(__QDISC_STATE_RUNNING, &qdisc->state))
if (!spin_trylock(&qdisc->seqlock))
return false;
} else if (qdisc_is_running(qdisc)) {
return false;
@ -138,7 +138,7 @@ static inline void qdisc_run_end(struct Qdisc *qdisc)
{
write_seqcount_end(&qdisc->running);
if (qdisc->flags & TCQ_F_NOLOCK)
clear_bit(__QDISC_STATE_RUNNING, &qdisc->state);
spin_unlock(&qdisc->seqlock);
}
static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)

11
net/sched/sch_generic.c
View File

@ -858,6 +858,11 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
lockdep_set_class(&sch->busylock,
dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
/* seqlock has the same scope of busylock, for NOLOCK qdisc */
spin_lock_init(&sch->seqlock);
lockdep_set_class(&sch->busylock,
dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
seqcount_init(&sch->running);
lockdep_set_class(&sch->running,
dev->qdisc_running_key ?: &qdisc_running_key);
@ -1097,6 +1102,10 @@ static void dev_deactivate_queue(struct net_device *dev,
qdisc = rtnl_dereference(dev_queue->qdisc);
if (qdisc) {
bool nolock = qdisc->flags & TCQ_F_NOLOCK;
if (nolock)
spin_lock_bh(&qdisc->seqlock);
spin_lock_bh(qdisc_lock(qdisc));
if (!(qdisc->flags & TCQ_F_BUILTIN))
@ -1106,6 +1115,8 @@ static void dev_deactivate_queue(struct net_device *dev,
qdisc_reset(qdisc);
spin_unlock_bh(qdisc_lock(qdisc));
if (nolock)
spin_unlock_bh(&qdisc->seqlock);
}
}