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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 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 | ||
51 | static inline psched_time_t psched_get_time(void) | |
52 | { | |
53 | return PSCHED_NS2TICKS(ktime_get_ns()); | |
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 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); | |
68 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle); | |
69 | ||
70 | static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, | |
71 | psched_time_t expires) | |
72 | { | |
73 | qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires), true); | |
74 | } | |
75 | ||
76 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); | |
77 | ||
78 | extern struct Qdisc_ops pfifo_qdisc_ops; | |
79 | extern struct Qdisc_ops bfifo_qdisc_ops; | |
80 | extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; | |
81 | ||
82 | int fifo_set_limit(struct Qdisc *q, unsigned int limit); | |
83 | struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, | |
84 | unsigned int limit); | |
85 | ||
86 | int register_qdisc(struct Qdisc_ops *qops); | |
87 | int unregister_qdisc(struct Qdisc_ops *qops); | |
88 | void qdisc_get_default(char *id, size_t len); | |
89 | int qdisc_set_default(const char *id); | |
90 | ||
91 | void qdisc_list_add(struct Qdisc *q); | |
92 | void qdisc_list_del(struct Qdisc *q); | |
93 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); | |
94 | struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); | |
95 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, | |
96 | struct nlattr *tab); | |
97 | void qdisc_put_rtab(struct qdisc_rate_table *tab); | |
98 | void qdisc_put_stab(struct qdisc_size_table *tab); | |
99 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); | |
100 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, | |
101 | struct net_device *dev, struct netdev_queue *txq, | |
102 | spinlock_t *root_lock, bool validate); | |
103 | ||
104 | void __qdisc_run(struct Qdisc *q); | |
105 | ||
106 | static inline void qdisc_run(struct Qdisc *q) | |
107 | { | |
108 | if (qdisc_run_begin(q)) | |
109 | __qdisc_run(q); | |
110 | } | |
111 | ||
112 | int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, | |
113 | struct tcf_result *res); | |
114 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
115 | struct tcf_result *res); | |
116 | ||
117 | /* Calculate maximal size of packet seen by hard_start_xmit | |
118 | routine of this device. | |
119 | */ | |
120 | static inline unsigned int psched_mtu(const struct net_device *dev) | |
121 | { | |
122 | return dev->mtu + dev->hard_header_len; | |
123 | } | |
124 | ||
125 | #endif |