net_sched: introduce qdisc_replace() helper

[mirror_ubuntu-jammy-kernel.git] / include / net / sch_generic.h

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 636a362a0e03574f0564d2f0a7b7a5fecfc1e3bd..8fdad9f7a2fb8a659637b0ede57d3744e6c8dfc0 100644 (file)
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -707,6 +707,23 @@ static inline void qdisc_reset_queue(struct Qdisc *sch)
        sch->qstats.backlog = 0;
 }
 
+static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
+                                         struct Qdisc **pold)
+{
+       struct Qdisc *old;
+
+       sch_tree_lock(sch);
+       old = *pold;
+       *pold = new;
+       if (old != NULL) {
+               qdisc_tree_decrease_qlen(old, old->q.qlen);
+               qdisc_reset(old);
+       }
+       sch_tree_unlock(sch);
+
+       return old;
+}
+
 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
                                              struct sk_buff_head *list)
 {