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
8 struct 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
qdisc_priv(struct Qdisc * q)18 static 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
40 typedef u64 psched_time_t;
41 typedef 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
psched_get_time(void)51 static inline psched_time_t psched_get_time(void)
52 {
53 return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
54 }
55
56 static inline psched_tdiff_t
psched_tdiff_bounded(psched_time_t tv1,psched_time_t tv2,psched_time_t bound)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
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
72 extern struct Qdisc_ops pfifo_qdisc_ops;
73 extern struct Qdisc_ops bfifo_qdisc_ops;
74 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
75
76 extern int fifo_set_limit(struct Qdisc *q, unsigned int limit);
77 extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
78 unsigned int limit);
79
80 extern int register_qdisc(struct Qdisc_ops *qops);
81 extern int unregister_qdisc(struct Qdisc_ops *qops);
82 extern void qdisc_list_del(struct Qdisc *q);
83 extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
84 extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
85 extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
86 struct nlattr *tab);
87 extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
88 extern void qdisc_put_stab(struct qdisc_size_table *tab);
89 extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc);
90 extern 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
94 extern void __qdisc_run(struct Qdisc *q);
95
qdisc_run(struct Qdisc * q)96 static inline void qdisc_run(struct Qdisc *q)
97 {
98 if (qdisc_run_begin(q))
99 __qdisc_run(q);
100 }
101
102 extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp,
103 struct tcf_result *res);
104 extern int tc_classify(struct sk_buff *skb, 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 */
psched_mtu(const struct net_device * dev)110 static inline unsigned psched_mtu(const struct net_device *dev)
111 {
112 return dev->mtu + dev->hard_header_len;
113 }
114
115 #endif
116