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_compat(struct sk_buff *skb, const struct tcf_proto *tp,
114		       struct tcf_result *res);
115int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
116		struct tcf_result *res);
117
118static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
119{
120	/* We need to take extra care in case the skb came via
121	 * vlan accelerated path. In that case, use skb->vlan_proto
122	 * as the original vlan header was already stripped.
123	 */
124	if (skb_vlan_tag_present(skb))
125		return skb->vlan_proto;
126	return skb->protocol;
127}
128
129/* Calculate maximal size of packet seen by hard_start_xmit
130   routine of this device.
131 */
132static inline unsigned int psched_mtu(const struct net_device *dev)
133{
134	return dev->mtu + dev->hard_header_len;
135}
136
137#endif
138