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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 | |
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 artifical |
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 | |
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 |
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 | |
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 | */ |
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 |
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