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-rw-r--r--include/net/sch_generic.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index da6839a7ff5..9dcb5bfe094 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -438,6 +438,29 @@ static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
return skb_peek(&sch->q);
}
+/* generic pseudo peek method for non-work-conserving qdisc */
+static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
+{
+ /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
+ if (!sch->gso_skb)
+ sch->gso_skb = sch->dequeue(sch);
+
+ return sch->gso_skb;
+}
+
+/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
+static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
+{
+ struct sk_buff *skb = sch->gso_skb;
+
+ if (skb)
+ sch->gso_skb = NULL;
+ else
+ skb = sch->dequeue(sch);
+
+ return skb;
+}
+
static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff_head *list)
{