tree 969c4d044d26ce67e16f763b9d9c229b668cee31
parent ab2816295f991700b7e2ee117880751be8f705b4
author Vlad Buslov <vladbu@mellanox.com> 1537806177 +0300
committer David S. Miller <davem@davemloft.net> 1537931856 -0700

net: sched: implement tcf_block_refcnt_{get|put}()

Implement get/put function for blocks that only take/release the reference
and perform deallocation. These functions are intended to be used by
unlocked rules update path to always hold reference to block while working
with it. They use on new fine-grained locking mechanisms introduced in
previous patches in this set, instead of relying on global protection
provided by rtnl lock.

Extract code that is common with tcf_block_detach_ext() into common
function __tcf_block_put().

Extend tcf_block with rcu to allow safe deallocation when it is accessed
concurrently.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>