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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 |
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 | */ |
40 | ||
1da177e4 LT |
41 | typedef u64 psched_time_t; |
42 | typedef long psched_tdiff_t; | |
43 | ||
a4a710c4 JP |
44 | /* Avoid doing 64 bit divide */ |
45 | #define PSCHED_SHIFT 6 | |
ca44d6e6 JP |
46 | #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) |
47 | #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) | |
1da177e4 | 48 | |
ca44d6e6 | 49 | #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) |
a084980d | 50 | #define PSCHED_PASTPERFECT 0 |
1da177e4 | 51 | |
3bebcda2 PM |
52 | static inline psched_time_t psched_get_time(void) |
53 | { | |
ca44d6e6 | 54 | return PSCHED_NS2TICKS(ktime_to_ns(ktime_get())); |
3bebcda2 PM |
55 | } |
56 | ||
03cc45c0 PM |
57 | static inline psched_tdiff_t |
58 | psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) | |
59 | { | |
60 | return min(tv1 - tv2, bound); | |
61 | } | |
62 | ||
4179477f PM |
63 | struct qdisc_watchdog { |
64 | struct hrtimer timer; | |
65 | struct Qdisc *qdisc; | |
66 | }; | |
67 | ||
68 | extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); | |
69 | extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, | |
70 | psched_time_t expires); | |
71 | extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); | |
72 | ||
1da177e4 LT |
73 | extern struct Qdisc_ops pfifo_qdisc_ops; |
74 | extern struct Qdisc_ops bfifo_qdisc_ops; | |
75 | ||
fb0305ce PM |
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 | ||
1da177e4 LT |
80 | extern int register_qdisc(struct Qdisc_ops *qops); |
81 | extern int unregister_qdisc(struct Qdisc_ops *qops); | |
f6e0b239 | 82 | extern void qdisc_list_del(struct Qdisc *q); |
1da177e4 LT |
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); | |
1da177e4 | 85 | extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
1e90474c | 86 | struct nlattr *tab); |
1da177e4 | 87 | extern void qdisc_put_rtab(struct qdisc_rate_table *tab); |
175f9c1b | 88 | extern void qdisc_put_stab(struct qdisc_size_table *tab); |
b00355db | 89 | extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc); |
1da177e4 | 90 | |
37437bb2 | 91 | extern void __qdisc_run(struct Qdisc *q); |
1da177e4 | 92 | |
37437bb2 | 93 | static inline void qdisc_run(struct Qdisc *q) |
1da177e4 | 94 | { |
f4ab5432 | 95 | if (!test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) |
37437bb2 | 96 | __qdisc_run(q); |
1da177e4 LT |
97 | } |
98 | ||
73ca4918 PM |
99 | extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
100 | struct tcf_result *res); | |
1da177e4 | 101 | extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 102 | struct tcf_result *res); |
1da177e4 LT |
103 | |
104 | /* Calculate maximal size of packet seen by hard_start_xmit | |
105 | routine of this device. | |
106 | */ | |
3b04ddde | 107 | static inline unsigned psched_mtu(const struct net_device *dev) |
1da177e4 | 108 | { |
3b04ddde | 109 | return dev->mtu + dev->hard_header_len; |
1da177e4 LT |
110 | } |
111 | ||
112 | #endif |