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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 | ||
16 | extern rwlock_t qdisc_tree_lock; | |
17 | ||
3d54b82f TG |
18 | #define QDISC_ALIGNTO 32 |
19 | #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) | |
1da177e4 LT |
20 | |
21 | static inline void *qdisc_priv(struct Qdisc *q) | |
22 | { | |
3d54b82f | 23 | return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); |
1da177e4 LT |
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 artifical | |
39 | clock evaluated by integration of network data flow | |
40 | in the most critical places. | |
1da177e4 LT |
41 | */ |
42 | ||
1da177e4 LT |
43 | typedef u64 psched_time_t; |
44 | typedef long psched_tdiff_t; | |
45 | ||
641b9e0e PM |
46 | /* Avoid doing 64 bit divide by 1000 */ |
47 | #define PSCHED_US2NS(x) ((s64)(x) << 10) | |
48 | #define PSCHED_NS2US(x) ((x) >> 10) | |
1da177e4 | 49 | |
641b9e0e PM |
50 | #define PSCHED_TICKS_PER_SEC PSCHED_NS2US(NSEC_PER_SEC) |
51 | #define PSCHED_GET_TIME(stamp) \ | |
52 | ((stamp) = PSCHED_NS2US(ktime_to_ns(ktime_get()))) | |
1da177e4 | 53 | |
a084980d | 54 | #define PSCHED_PASTPERFECT 0 |
1da177e4 | 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; | |
74 | ||
75 | extern int register_qdisc(struct Qdisc_ops *qops); | |
76 | extern int unregister_qdisc(struct Qdisc_ops *qops); | |
77 | extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); | |
78 | extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); | |
1da177e4 LT |
79 | extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
80 | struct rtattr *tab); | |
81 | extern void qdisc_put_rtab(struct qdisc_rate_table *tab); | |
82 | ||
48d83325 | 83 | extern void __qdisc_run(struct net_device *dev); |
1da177e4 LT |
84 | |
85 | static inline void qdisc_run(struct net_device *dev) | |
86 | { | |
48d83325 HX |
87 | if (!netif_queue_stopped(dev) && |
88 | !test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state)) | |
89 | __qdisc_run(dev); | |
1da177e4 LT |
90 | } |
91 | ||
92 | extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, | |
93 | struct tcf_result *res); | |
94 | ||
95 | /* Calculate maximal size of packet seen by hard_start_xmit | |
96 | routine of this device. | |
97 | */ | |
98 | static inline unsigned psched_mtu(struct net_device *dev) | |
99 | { | |
100 | unsigned mtu = dev->mtu; | |
101 | return dev->hard_header ? mtu + dev->hard_header_len : mtu; | |
102 | } | |
103 | ||
104 | #endif |