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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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1
include/linux/netdevice.h
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@ -1862,6 +1862,7 @@ struct net_device {
#endif
struct phy_device *phydev;
struct lock_class_key *qdisc_tx_busylock;
struct lock_class_key *qdisc_running_key;
bool proto_down;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)