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v3.1
  1#ifndef __NET_PKT_SCHED_H
  2#define __NET_PKT_SCHED_H
  3
  4#include <linux/jiffies.h>
  5#include <linux/ktime.h>
 
  6#include <net/sch_generic.h>
  7
  8struct qdisc_walker {
  9	int	stop;
 10	int	skip;
 11	int	count;
 12	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
 13};
 14
 15#define QDISC_ALIGNTO		64
 16#define QDISC_ALIGN(len)	(((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
 17
 18static inline void *qdisc_priv(struct Qdisc *q)
 19{
 20	return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
 21}
 22
 23/* 
 24   Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
 25   
 26   Normal IP packet size ~ 512byte, hence:
 27
 28   0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
 29   10Mbit ethernet.
 30
 31   10msec resolution -> <50Kbit/sec.
 32   
 33   The result: [34]86 is not good choice for QoS router :-(
 34
 35   The things are not so bad, because we may use artificial
 36   clock evaluated by integration of network data flow
 37   in the most critical places.
 38 */
 39
 40typedef u64	psched_time_t;
 41typedef long	psched_tdiff_t;
 42
 43/* Avoid doing 64 bit divide */
 44#define PSCHED_SHIFT			6
 45#define PSCHED_TICKS2NS(x)		((s64)(x) << PSCHED_SHIFT)
 46#define PSCHED_NS2TICKS(x)		((x) >> PSCHED_SHIFT)
 47
 48#define PSCHED_TICKS_PER_SEC		PSCHED_NS2TICKS(NSEC_PER_SEC)
 49#define PSCHED_PASTPERFECT		0
 50
 51static inline psched_time_t psched_get_time(void)
 52{
 53	return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
 54}
 55
 56static inline psched_tdiff_t
 57psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
 58{
 59	return min(tv1 - tv2, bound);
 60}
 61
 62struct qdisc_watchdog {
 63	struct hrtimer	timer;
 64	struct Qdisc	*qdisc;
 65};
 66
 67extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
 68extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
 69				    psched_time_t expires);
 70extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
 
 
 
 
 
 
 71
 72extern struct Qdisc_ops pfifo_qdisc_ops;
 73extern struct Qdisc_ops bfifo_qdisc_ops;
 74extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
 75
 76extern int fifo_set_limit(struct Qdisc *q, unsigned int limit);
 77extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
 78				      unsigned int limit);
 79
 80extern int register_qdisc(struct Qdisc_ops *qops);
 81extern int unregister_qdisc(struct Qdisc_ops *qops);
 82extern void qdisc_list_del(struct Qdisc *q);
 83extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
 84extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
 85extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
 86		struct nlattr *tab);
 87extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
 88extern void qdisc_put_stab(struct qdisc_size_table *tab);
 89extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc);
 90extern int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 91			   struct net_device *dev, struct netdev_queue *txq,
 92			   spinlock_t *root_lock);
 
 
 
 
 93
 94extern void __qdisc_run(struct Qdisc *q);
 95
 96static inline void qdisc_run(struct Qdisc *q)
 97{
 98	if (qdisc_run_begin(q))
 99		__qdisc_run(q);
100}
101
102extern int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
103			      struct tcf_result *res);
104extern int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
105		       struct tcf_result *res);
 
 
 
 
 
 
 
 
 
106
107/* Calculate maximal size of packet seen by hard_start_xmit
108   routine of this device.
109 */
110static inline unsigned psched_mtu(const struct net_device *dev)
111{
112	return dev->mtu + dev->hard_header_len;
113}
114
115#endif
v4.6
  1#ifndef __NET_PKT_SCHED_H
  2#define __NET_PKT_SCHED_H
  3
  4#include <linux/jiffies.h>
  5#include <linux/ktime.h>
  6#include <linux/if_vlan.h>
  7#include <net/sch_generic.h>
  8
  9struct qdisc_walker {
 10	int	stop;
 11	int	skip;
 12	int	count;
 13	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
 14};
 15
 16#define QDISC_ALIGNTO		64
 17#define QDISC_ALIGN(len)	(((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
 18
 19static inline void *qdisc_priv(struct Qdisc *q)
 20{
 21	return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
 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 artificial
 37   clock evaluated by integration of network data flow
 38   in the most critical places.
 39 */
 40
 41typedef u64	psched_time_t;
 42typedef long	psched_tdiff_t;
 43
 44/* Avoid doing 64 bit divide */
 45#define PSCHED_SHIFT			6
 46#define PSCHED_TICKS2NS(x)		((s64)(x) << PSCHED_SHIFT)
 47#define PSCHED_NS2TICKS(x)		((x) >> PSCHED_SHIFT)
 48
 49#define PSCHED_TICKS_PER_SEC		PSCHED_NS2TICKS(NSEC_PER_SEC)
 50#define PSCHED_PASTPERFECT		0
 51
 52static inline psched_time_t psched_get_time(void)
 53{
 54	return PSCHED_NS2TICKS(ktime_get_ns());
 55}
 56
 57static inline psched_tdiff_t
 58psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
 59{
 60	return min(tv1 - tv2, bound);
 61}
 62
 63struct qdisc_watchdog {
 64	struct hrtimer	timer;
 65	struct Qdisc	*qdisc;
 66};
 67
 68void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
 69void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle);
 70
 71static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
 72					   psched_time_t expires)
 73{
 74	qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires), true);
 75}
 76
 77void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
 78
 79extern struct Qdisc_ops pfifo_qdisc_ops;
 80extern struct Qdisc_ops bfifo_qdisc_ops;
 81extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
 82
 83int fifo_set_limit(struct Qdisc *q, unsigned int limit);
 84struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
 85			       unsigned int limit);
 86
 87int register_qdisc(struct Qdisc_ops *qops);
 88int unregister_qdisc(struct Qdisc_ops *qops);
 89void qdisc_get_default(char *id, size_t len);
 90int qdisc_set_default(const char *id);
 91
 92void qdisc_list_add(struct Qdisc *q);
 93void qdisc_list_del(struct Qdisc *q);
 94struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
 95struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
 96struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
 97					struct nlattr *tab);
 98void qdisc_put_rtab(struct qdisc_rate_table *tab);
 99void qdisc_put_stab(struct qdisc_size_table *tab);
100void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
101int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
102		    struct net_device *dev, struct netdev_queue *txq,
103		    spinlock_t *root_lock, bool validate);
104
105void __qdisc_run(struct Qdisc *q);
106
107static inline void qdisc_run(struct Qdisc *q)
108{
109	if (qdisc_run_begin(q))
110		__qdisc_run(q);
111}
112
113int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
114		struct tcf_result *res, bool compat_mode);
115
116static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
117{
118	/* We need to take extra care in case the skb came via
119	 * vlan accelerated path. In that case, use skb->vlan_proto
120	 * as the original vlan header was already stripped.
121	 */
122	if (skb_vlan_tag_present(skb))
123		return skb->vlan_proto;
124	return skb->protocol;
125}
126
127/* Calculate maximal size of packet seen by hard_start_xmit
128   routine of this device.
129 */
130static inline unsigned int psched_mtu(const struct net_device *dev)
131{
132	return dev->mtu + dev->hard_header_len;
133}
134
135#endif