int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
struct sk_buff * (*dequeue)(struct Qdisc *dev);
unsigned flags;
-#define TCQ_F_BUILTIN 1
-#define TCQ_F_THROTTLED 2
-#define TCQ_F_INGRESS 4
+#define TCQ_F_BUILTIN 1
+#define TCQ_F_THROTTLED 2
+#define TCQ_F_INGRESS 4
+#define TCQ_F_WARN_NONWC (1 << 16)
int padded;
struct Qdisc_ops *ops;
struct qdisc_size_table *stab;
+ struct list_head list;
u32 handle;
u32 parent;
atomic_t refcnt;
- unsigned long state;
- struct sk_buff *gso_skb;
- struct sk_buff_head requeue;
- struct sk_buff_head q;
- struct netdev_queue *dev_queue;
- struct Qdisc *next_sched;
- struct list_head list;
-
- struct gnet_stats_basic bstats;
- struct gnet_stats_queue qstats;
struct gnet_stats_rate_est rate_est;
int (*reshape_fail)(struct sk_buff *skb,
struct Qdisc *q);
* and it will live until better solution will be invented.
*/
struct Qdisc *__parent;
+ struct netdev_queue *dev_queue;
+ struct Qdisc *next_sched;
+
+ struct sk_buff *gso_skb;
+ /*
+ * For performance sake on SMP, we put highly modified fields at the end
+ */
+ unsigned long state;
+ struct sk_buff_head q;
+ struct gnet_stats_basic bstats;
+ struct gnet_stats_queue qstats;
};
struct Qdisc_class_ops
int (*enqueue)(struct sk_buff *, struct Qdisc *);
struct sk_buff * (*dequeue)(struct Qdisc *);
- int (*requeue)(struct sk_buff *, struct Qdisc *);
+ struct sk_buff * (*peek)(struct Qdisc *);
unsigned int (*drop)(struct Qdisc *);
int (*init)(struct Qdisc *, struct nlattr *arg);
return __qdisc_dequeue_tail(sch, &sch->q);
}
-static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
- struct sk_buff_head *list)
+static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
{
- __skb_queue_head(list, skb);
- sch->qstats.backlog += qdisc_pkt_len(skb);
- sch->qstats.requeues++;
+ return skb_peek(&sch->q);
+}
- return NET_XMIT_SUCCESS;
+/* 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;
}
-static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
+/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
+static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
{
- return __qdisc_requeue(skb, sch, &sch->q);
+ 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 void __qdisc_reset_queue(struct Qdisc *sch,