[net-next-2.6.git] / include / net / pkt_sched.h

#ifndef __NET_PKT_SCHED_H
#define __NET_PKT_SCHED_H

#include <linux/jiffies.h>
#include <linux/ktime.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		32
#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 artifical
   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 by 1000 */
#define PSCHED_US2NS(x)			((s64)(x) << 10)
#define PSCHED_NS2US(x)			((x) >> 10)

#define PSCHED_TICKS_PER_SEC		PSCHED_NS2US(NSEC_PER_SEC)
#define PSCHED_PASTPERFECT		0

static inline psched_time_t psched_get_time(void)
{
	return PSCHED_NS2US(ktime_to_ns(ktime_get()));
}

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;
};

extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
				    psched_time_t expires);
extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);

extern struct Qdisc_ops pfifo_qdisc_ops;
extern struct Qdisc_ops bfifo_qdisc_ops;

extern int register_qdisc(struct Qdisc_ops *qops);
extern int unregister_qdisc(struct Qdisc_ops *qops);
extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
		struct rtattr *tab);
extern void qdisc_put_rtab(struct qdisc_rate_table *tab);

extern void __qdisc_run(struct net_device *dev);

static inline void qdisc_run(struct net_device *dev)
{
	if (!netif_queue_stopped(dev) &&
	    !test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
		__qdisc_run(dev);
}

extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp,
			      struct tcf_result *res);
extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
		       struct tcf_result *res);

/* Calculate maximal size of packet seen by hard_start_xmit
   routine of this device.
 */
static inline unsigned psched_mtu(const struct net_device *dev)
{
	return dev->mtu + dev->hard_header_len;
}

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __NET_PKT_SCHED_H
	2	#define __NET_PKT_SCHED_H
	3
538e43a4	4	#include <linux/jiffies.h>
641b9e0e	5	#include <linux/ktime.h>
1da177e4 LT	6	#include <net/sch_generic.h>
	7
	8	struct qdisc_walker
	9	{
	10	int stop;
	11	int skip;
	12	int count;
	13	int (fn)(struct Qdisc , unsigned long cl, struct qdisc_walker *);
	14	};
	15
3d54b82f TG	16	#define QDISC_ALIGNTO 32
3d54b82f TG	17	#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
1da177e4 LT	18
	19	static inline void qdisc_priv(struct Qdisc q)
	20	{
3d54b82f	21	return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
1da177e4 LT	22	}
	23
	24	/*
	25	Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
	26
	27	Normal IP packet size ~ 512byte, hence:
	28
	29	0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
	30	10Mbit ethernet.
	31
	32	10msec resolution -> <50Kbit/sec.
	33
	34	The result: [34]86 is not good choice for QoS router :-(
	35
	36	The things are not so bad, because we may use artifical
	37	clock evaluated by integration of network data flow
	38	in the most critical places.
1da177e4 LT	39	*/
1da177e4 LT	40
1da177e4 LT	41	typedef u64 psched_time_t;
	42	typedef long psched_tdiff_t;
	43
641b9e0e PM	44	/* Avoid doing 64 bit divide by 1000 */
	45	#define PSCHED_US2NS(x) ((s64)(x) << 10)
	46	#define PSCHED_NS2US(x) ((x) >> 10)
1da177e4	47
641b9e0e	48	#define PSCHED_TICKS_PER_SEC PSCHED_NS2US(NSEC_PER_SEC)
a084980d	49	#define PSCHED_PASTPERFECT 0
1da177e4	50
3bebcda2 PM	51	static inline psched_time_t psched_get_time(void)
	52	{
	53	return PSCHED_NS2US(ktime_to_ns(ktime_get()));
	54	}
	55
03cc45c0 PM	56	static inline psched_tdiff_t
	57	psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
	58	{
	59	return min(tv1 - tv2, bound);
	60	}
	61
4179477f PM	62	struct qdisc_watchdog {
	63	struct hrtimer timer;
	64	struct Qdisc *qdisc;
	65	};
	66
	67	extern void qdisc_watchdog_init(struct qdisc_watchdog wd, struct Qdisc qdisc);
	68	extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
	69	psched_time_t expires);
	70	extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
	71
1da177e4 LT	72	extern struct Qdisc_ops pfifo_qdisc_ops;
	73	extern struct Qdisc_ops bfifo_qdisc_ops;
	74
	75	extern int register_qdisc(struct Qdisc_ops *qops);
	76	extern int unregister_qdisc(struct Qdisc_ops *qops);
	77	extern struct Qdisc qdisc_lookup(struct net_device dev, u32 handle);
	78	extern struct Qdisc qdisc_lookup_class(struct net_device dev, u32 handle);
1da177e4 LT	79	extern struct qdisc_rate_table qdisc_get_rtab(struct tc_ratespec r,
	80	struct rtattr *tab);
	81	extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
	82
48d83325	83	extern void __qdisc_run(struct net_device *dev);
1da177e4 LT	84
	85	static inline void qdisc_run(struct net_device *dev)
	86	{
48d83325 HX	87	if (!netif_queue_stopped(dev) &&
	88	!test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
	89	__qdisc_run(dev);
1da177e4 LT	90	}
1da177e4 LT	91
73ca4918 PM	92	extern int tc_classify_compat(struct sk_buff skb, struct tcf_proto tp,
73ca4918 PM	93	struct tcf_result *res);
1da177e4	94	extern int tc_classify(struct sk_buff skb, struct tcf_proto tp,
73ca4918	95	struct tcf_result *res);
1da177e4 LT	96
	97	/* Calculate maximal size of packet seen by hard_start_xmit
	98	routine of this device.
	99	*/
3b04ddde	100	static inline unsigned psched_mtu(const struct net_device *dev)
1da177e4	101	{
3b04ddde	102	return dev->mtu + dev->hard_header_len;
1da177e4 LT	103	}
	104
	105	#endif