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net_sched: transform qdisc running bit into a seqcount

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Instead of using a single bit (__QDISC___STATE_RUNNING)
in sch->__state, use a seqcount.

This adds lockdep support, but more importantly it will allow us
to sample qdisc/class statistics without having to grab qdisc root lock.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2016-06-06 09:37:15 -07:00
committed by David S. Miller
parent 64151ae36e
commit f9eb8aea2a
10 changed files with 32 additions and 16 deletions
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2
net/bluetooth/6lowpan.c
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@@ -629,6 +629,7 @@ static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
static struct lock_class_key bt_tx_busylock;
static struct lock_class_key bt_netdev_xmit_lock_key;
static struct lock_class_key bt_qdisc_running_key;
static void bt_set_lockdep_class_one(struct net_device *dev,
struct netdev_queue *txq,
@@ -641,6 +642,7 @@ static int bt_dev_init(struct net_device *dev)
{
netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL);
dev->qdisc_tx_busylock = &bt_tx_busylock;
dev->qdisc_running_key = &bt_qdisc_running_key;
return 0;
}