diff options
Diffstat (limited to 'include/net/sch_generic.h')
| -rw-r--r-- | include/net/sch_generic.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 3fe49d808957..64ae1ba9f554 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -111,6 +111,7 @@ struct Qdisc_ops int (*enqueue)(struct sk_buff *, struct Qdisc *); struct sk_buff * (*dequeue)(struct Qdisc *); + struct sk_buff * (*peek)(struct Qdisc *); int (*requeue)(struct sk_buff *, struct Qdisc *); unsigned int (*drop)(struct Qdisc *); @@ -432,6 +433,40 @@ static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) return __qdisc_dequeue_tail(sch, &sch->q); } +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); + if (sch->gso_skb) + /* it's still part of the queue */ + sch->q.qlen++; + } + + 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; + sch->q.qlen--; + } else { + skb = sch->dequeue(sch); + } + + return skb; +} + static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff_head *list) { |