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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 | ||
fd2c3ef7 | 8 | struct qdisc_walker { |
1da177e4 LT |
9 | int stop; |
10 | int skip; | |
11 | int count; | |
12 | int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); | |
13 | }; | |
14 | ||
5d944c64 | 15 | #define QDISC_ALIGNTO 64 |
3d54b82f | 16 | #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) |
1da177e4 LT |
17 | |
18 | static inline void *qdisc_priv(struct Qdisc *q) | |
19 | { | |
3d54b82f | 20 | return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); |
1da177e4 LT |
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 | ||
25985edc | 35 | The things are not so bad, because we may use artificial |
1da177e4 LT |
36 | clock evaluated by integration of network data flow |
37 | in the most critical places. | |
1da177e4 LT |
38 | */ |
39 | ||
1da177e4 LT |
40 | typedef u64 psched_time_t; |
41 | typedef long psched_tdiff_t; | |
42 | ||
a4a710c4 JP |
43 | /* Avoid doing 64 bit divide */ |
44 | #define PSCHED_SHIFT 6 | |
ca44d6e6 JP |
45 | #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) |
46 | #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) | |
1da177e4 | 47 | |
ca44d6e6 | 48 | #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) |
a084980d | 49 | #define PSCHED_PASTPERFECT 0 |
1da177e4 | 50 | |
3bebcda2 PM |
51 | static inline psched_time_t psched_get_time(void) |
52 | { | |
ca44d6e6 | 53 | return PSCHED_NS2TICKS(ktime_to_ns(ktime_get())); |
3bebcda2 PM |
54 | } |
55 | ||
03cc45c0 PM |
56 | static inline psched_tdiff_t |
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 | ||
4179477f PM |
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 | ||
1da177e4 LT |
72 | extern struct Qdisc_ops pfifo_qdisc_ops; |
73 | extern struct Qdisc_ops bfifo_qdisc_ops; | |
57dbb2d8 | 74 | extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; |
1da177e4 | 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); |
bbd8a0d3 KK |
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); | |
1da177e4 | 93 | |
37437bb2 | 94 | extern void __qdisc_run(struct Qdisc *q); |
1da177e4 | 95 | |
37437bb2 | 96 | static inline void qdisc_run(struct Qdisc *q) |
1da177e4 | 97 | { |
bc135b23 | 98 | if (qdisc_run_begin(q)) |
37437bb2 | 99 | __qdisc_run(q); |
1da177e4 LT |
100 | } |
101 | ||
dc7f9f6e | 102 | extern int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 | 103 | struct tcf_result *res); |
dc7f9f6e | 104 | extern int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 | 105 | struct tcf_result *res); |
1da177e4 LT |
106 | |
107 | /* Calculate maximal size of packet seen by hard_start_xmit | |
108 | routine of this device. | |
109 | */ | |
3b04ddde | 110 | static inline unsigned psched_mtu(const struct net_device *dev) |
1da177e4 | 111 | { |
3b04ddde | 112 | return dev->mtu + dev->hard_header_len; |
1da177e4 LT |
113 | } |
114 | ||
115 | #endif |