Initial import

1 files changed, 137 insertions, 0 deletions

diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
new file mode 100644
index 000000000..2342bf12c
--- /dev/null
+++ b/include/net/pkt_sched.h
@@ -0,0 +1,137 @@
+#ifndef __NET_PKT_SCHED_H
+#define __NET_PKT_SCHED_H
+
+#include <linux/jiffies.h>
+#include <linux/ktime.h>
+#include <linux/if_vlan.h>
+#include <net/sch_generic.h>
+
+struct qdisc_walker {
+	int	stop;
+	int	skip;
+	int	count;
+	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
+};
+
+#define QDISC_ALIGNTO		64
+#define QDISC_ALIGN(len)	(((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
+
+static inline void *qdisc_priv(struct Qdisc *q)
+{
+	return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
+}
+
+/* 
+   Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
+   
+   Normal IP packet size ~ 512byte, hence:
+
+   0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
+   10Mbit ethernet.
+
+   10msec resolution -> <50Kbit/sec.
+   
+   The result: [34]86 is not good choice for QoS router :-(
+
+   The things are not so bad, because we may use artificial
+   clock evaluated by integration of network data flow
+   in the most critical places.
+ */
+
+typedef u64	psched_time_t;
+typedef long	psched_tdiff_t;
+
+/* Avoid doing 64 bit divide */
+#define PSCHED_SHIFT			6
+#define PSCHED_TICKS2NS(x)		((s64)(x) << PSCHED_SHIFT)
+#define PSCHED_NS2TICKS(x)		((x) >> PSCHED_SHIFT)
+
+#define PSCHED_TICKS_PER_SEC		PSCHED_NS2TICKS(NSEC_PER_SEC)
+#define PSCHED_PASTPERFECT		0
+
+static inline psched_time_t psched_get_time(void)
+{
+	return PSCHED_NS2TICKS(ktime_get_ns());
+}
+
+static inline psched_tdiff_t
+psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
+{
+	return min(tv1 - tv2, bound);
+}
+
+struct qdisc_watchdog {
+	struct hrtimer	timer;
+	struct Qdisc	*qdisc;
+};
+
+void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
+void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle);
+
+static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
+					   psched_time_t expires)
+{
+	qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires), true);
+}
+
+void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
+
+extern struct Qdisc_ops pfifo_qdisc_ops;
+extern struct Qdisc_ops bfifo_qdisc_ops;
+extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
+
+int fifo_set_limit(struct Qdisc *q, unsigned int limit);
+struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
+			       unsigned int limit);
+
+int register_qdisc(struct Qdisc_ops *qops);
+int unregister_qdisc(struct Qdisc_ops *qops);
+void qdisc_get_default(char *id, size_t len);
+int qdisc_set_default(const char *id);
+
+void qdisc_list_add(struct Qdisc *q);
+void qdisc_list_del(struct Qdisc *q);
+struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
+struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
+struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
+					struct nlattr *tab);
+void qdisc_put_rtab(struct qdisc_rate_table *tab);
+void qdisc_put_stab(struct qdisc_size_table *tab);
+void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
+int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
+		    struct net_device *dev, struct netdev_queue *txq,
+		    spinlock_t *root_lock, bool validate);
+
+void __qdisc_run(struct Qdisc *q);
+
+static inline void qdisc_run(struct Qdisc *q)
+{
+	if (qdisc_run_begin(q))
+		__qdisc_run(q);
+}
+
+int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
+		       struct tcf_result *res);
+int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+		struct tcf_result *res);
+
+static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
+{
+	/* We need to take extra care in case the skb came via
+	 * vlan accelerated path. In that case, use skb->vlan_proto
+	 * as the original vlan header was already stripped.
+	 */
+	if (skb_vlan_tag_present(skb))
+		return skb->vlan_proto;
+	return skb->protocol;
+}
+
+/* Calculate maximal size of packet seen by hard_start_xmit
+   routine of this device.
+ */
+static inline unsigned int psched_mtu(const struct net_device *dev)
+{
+	return dev->mtu + dev->hard_header_len;
+}
+
+#endif