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Commit 9d7e82ce authored by Vlad Buslov's avatar Vlad Buslov Committed by David S. Miller
Browse files

net: sched: add helper function to take reference to Qdisc 



Implement function to take reference to Qdisc that relies on rcu read lock
instead of rtnl mutex. Function only takes reference to Qdisc if reference
counter isn't zero. Intended to be used by unlocked cls API.

Signed-off-by: default avatarVlad Buslov <vladbu@mellanox.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3a7d0d07

include/net/sch_generic.h

+13 −0
Original line number Diff line number Diff line
@@ -115,6 +115,19 @@ static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 
	refcount_inc(&qdisc->refcnt);

}



/* Intended to be used by unlocked users, when concurrent qdisc release is

 * possible.

 */



static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)

{

	if (qdisc->flags & TCQ_F_BUILTIN)

		return qdisc;

	if (refcount_inc_not_zero(&qdisc->refcnt))

		return qdisc;

	return NULL;

}



static inline bool qdisc_is_running(struct Qdisc *qdisc)

{

	if (qdisc->flags & TCQ_F_NOLOCK)