net: sched: extend Qdisc with rcu
authorVlad Buslov <vladbu@mellanox.com>
Mon, 24 Sep 2018 16:22:51 +0000 (19:22 +0300)
committerDavid S. Miller <davem@davemloft.net>
Wed, 26 Sep 2018 03:17:35 +0000 (20:17 -0700)
commit3a7d0d07a386716b459b00783b11a8211cefcc0f
tree4d1cf3e61e9262e1bb3436e6c24735753e19d00a
parent86bd446b5cebd783187ea3772ff258210de77d99
net: sched: extend Qdisc with rcu

Currently, Qdisc API functions assume that users have rtnl lock taken. To
implement rtnl unlocked classifiers update interface, Qdisc API must be
extended with functions that do not require rtnl lock.

Extend Qdisc structure with rcu. Implement special version of put function
qdisc_put_unlocked() that is called without rtnl lock taken. This function
only takes rtnl lock if Qdisc reference counter reached zero and is
intended to be used as optimization.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/linux/rtnetlink.h
include/net/pkt_sched.h
include/net/sch_generic.h
net/sched/sch_api.c
net/sched/sch_generic.c