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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
v4.10.11
  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
  9#define DEFAULT_TX_QUEUE_LEN	1000
 10
 11struct qdisc_walker {
 12	int	stop;
 13	int	skip;
 14	int	count;
 15	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
 16};
 17
 18#define QDISC_ALIGNTO		64
 19#define QDISC_ALIGN(len)	(((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
 20
 21static inline void *qdisc_priv(struct Qdisc *q)
 22{
 23	return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
 24}
 25
 26/* 
 27   Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
 28   
 29   Normal IP packet size ~ 512byte, hence:
 30
 31   0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
 32   10Mbit ethernet.
 33
 34   10msec resolution -> <50Kbit/sec.
 35   
 36   The result: [34]86 is not good choice for QoS router :-(
 37
 38   The things are not so bad, because we may use artificial
 39   clock evaluated by integration of network data flow
 40   in the most critical places.
 41 */
 42
 43typedef u64	psched_time_t;
 44typedef long	psched_tdiff_t;
 45
 46/* Avoid doing 64 bit divide */
 47#define PSCHED_SHIFT			6
 48#define PSCHED_TICKS2NS(x)		((s64)(x) << PSCHED_SHIFT)
 49#define PSCHED_NS2TICKS(x)		((x) >> PSCHED_SHIFT)
 50
 51#define PSCHED_TICKS_PER_SEC		PSCHED_NS2TICKS(NSEC_PER_SEC)
 52#define PSCHED_PASTPERFECT		0
 53
 54static inline psched_time_t psched_get_time(void)
 55{
 56	return PSCHED_NS2TICKS(ktime_get_ns());
 57}
 58
 59static inline psched_tdiff_t
 60psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
 61{
 62	return min(tv1 - tv2, bound);
 63}
 64
 65struct qdisc_watchdog {
 66	u64		last_expires;
 67	struct hrtimer	timer;
 68	struct Qdisc	*qdisc;
 69};
 70
 71void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
 72void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
 73
 74static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
 75					   psched_time_t expires)
 76{
 77	qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
 78}
 79
 80void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
 81
 82extern struct Qdisc_ops pfifo_qdisc_ops;
 83extern struct Qdisc_ops bfifo_qdisc_ops;
 84extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
 85
 86int fifo_set_limit(struct Qdisc *q, unsigned int limit);
 87struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
 88			       unsigned int limit);
 89
 90int register_qdisc(struct Qdisc_ops *qops);
 91int unregister_qdisc(struct Qdisc_ops *qops);
 92void qdisc_get_default(char *id, size_t len);
 93int qdisc_set_default(const char *id);
 94
 95void qdisc_hash_add(struct Qdisc *q);
 96void qdisc_hash_del(struct Qdisc *q);
 97struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
 98struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
 99struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
100					struct nlattr *tab);
101void qdisc_put_rtab(struct qdisc_rate_table *tab);
102void qdisc_put_stab(struct qdisc_size_table *tab);
103void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
104int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
105		    struct net_device *dev, struct netdev_queue *txq,
106		    spinlock_t *root_lock, bool validate);
107
108void __qdisc_run(struct Qdisc *q);
109
110static inline void qdisc_run(struct Qdisc *q)
111{
112	if (qdisc_run_begin(q))
113		__qdisc_run(q);
114}
115
116int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
117		struct tcf_result *res, bool compat_mode);
118
119static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
120{
121	/* We need to take extra care in case the skb came via
122	 * vlan accelerated path. In that case, use skb->vlan_proto
123	 * as the original vlan header was already stripped.
124	 */
125	if (skb_vlan_tag_present(skb))
126		return skb->vlan_proto;
127	return skb->protocol;
128}
129
130/* Calculate maximal size of packet seen by hard_start_xmit
131   routine of this device.
132 */
133static inline unsigned int psched_mtu(const struct net_device *dev)
134{
135	return dev->mtu + dev->hard_header_len;
136}
137
138#endif