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1da177e4 LT |
1 | #ifndef __NET_PKT_SCHED_H |
2 | #define __NET_PKT_SCHED_H | |
3 | ||
4 | #include <net/sch_generic.h> | |
5 | ||
6 | struct qdisc_walker | |
7 | { | |
8 | int stop; | |
9 | int skip; | |
10 | int count; | |
11 | int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); | |
12 | }; | |
13 | ||
14 | extern rwlock_t qdisc_tree_lock; | |
15 | ||
16 | #define QDISC_ALIGN 32 | |
17 | #define QDISC_ALIGN_CONST (QDISC_ALIGN - 1) | |
18 | ||
19 | static inline void *qdisc_priv(struct Qdisc *q) | |
20 | { | |
21 | return (char *)q + ((sizeof(struct Qdisc) + QDISC_ALIGN_CONST) | |
22 | & ~QDISC_ALIGN_CONST); | |
23 | } | |
24 | ||
25 | /* | |
26 | Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth | |
27 | ||
28 | Normal IP packet size ~ 512byte, hence: | |
29 | ||
30 | 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for | |
31 | 10Mbit ethernet. | |
32 | ||
33 | 10msec resolution -> <50Kbit/sec. | |
34 | ||
35 | The result: [34]86 is not good choice for QoS router :-( | |
36 | ||
37 | The things are not so bad, because we may use artifical | |
38 | clock evaluated by integration of network data flow | |
39 | in the most critical places. | |
40 | ||
41 | Note: we do not use fastgettimeofday. | |
42 | The reason is that, when it is not the same thing as | |
43 | gettimeofday, it returns invalid timestamp, which is | |
44 | not updated, when net_bh is active. | |
45 | */ | |
46 | ||
47 | /* General note about internal clock. | |
48 | ||
49 | Any clock source returns time intervals, measured in units | |
50 | close to 1usec. With source CONFIG_NET_SCH_CLK_GETTIMEOFDAY it is precisely | |
51 | microseconds, otherwise something close but different chosen to minimize | |
52 | arithmetic cost. Ratio usec/internal untis in form nominator/denominator | |
53 | may be read from /proc/net/psched. | |
54 | */ | |
55 | ||
56 | ||
57 | #ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY | |
58 | ||
59 | typedef struct timeval psched_time_t; | |
60 | typedef long psched_tdiff_t; | |
61 | ||
62 | #define PSCHED_GET_TIME(stamp) do_gettimeofday(&(stamp)) | |
63 | #define PSCHED_US2JIFFIE(usecs) (((usecs)+(1000000/HZ-1))/(1000000/HZ)) | |
64 | #define PSCHED_JIFFIE2US(delay) ((delay)*(1000000/HZ)) | |
65 | ||
66 | #else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ | |
67 | ||
68 | typedef u64 psched_time_t; | |
69 | typedef long psched_tdiff_t; | |
70 | ||
71 | #ifdef CONFIG_NET_SCH_CLK_JIFFIES | |
72 | ||
73 | #if HZ < 96 | |
74 | #define PSCHED_JSCALE 14 | |
75 | #elif HZ >= 96 && HZ < 192 | |
76 | #define PSCHED_JSCALE 13 | |
77 | #elif HZ >= 192 && HZ < 384 | |
78 | #define PSCHED_JSCALE 12 | |
79 | #elif HZ >= 384 && HZ < 768 | |
80 | #define PSCHED_JSCALE 11 | |
81 | #elif HZ >= 768 | |
82 | #define PSCHED_JSCALE 10 | |
83 | #endif | |
84 | ||
85 | #define PSCHED_GET_TIME(stamp) ((stamp) = (get_jiffies_64()<<PSCHED_JSCALE)) | |
86 | #define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE) | |
87 | #define PSCHED_JIFFIE2US(delay) ((delay)<<PSCHED_JSCALE) | |
88 | ||
89 | #endif /* CONFIG_NET_SCH_CLK_JIFFIES */ | |
90 | #ifdef CONFIG_NET_SCH_CLK_CPU | |
91 | #include <asm/timex.h> | |
92 | ||
93 | extern psched_tdiff_t psched_clock_per_hz; | |
94 | extern int psched_clock_scale; | |
95 | extern psched_time_t psched_time_base; | |
96 | extern cycles_t psched_time_mark; | |
97 | ||
98 | #define PSCHED_GET_TIME(stamp) \ | |
99 | do { \ | |
100 | cycles_t cur = get_cycles(); \ | |
101 | if (sizeof(cycles_t) == sizeof(u32)) { \ | |
102 | if (cur <= psched_time_mark) \ | |
103 | psched_time_base += 0x100000000ULL; \ | |
104 | psched_time_mark = cur; \ | |
105 | (stamp) = (psched_time_base + cur)>>psched_clock_scale; \ | |
106 | } else { \ | |
107 | (stamp) = cur>>psched_clock_scale; \ | |
108 | } \ | |
109 | } while (0) | |
110 | #define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz) | |
111 | #define PSCHED_JIFFIE2US(delay) ((delay)*psched_clock_per_hz) | |
112 | ||
113 | #endif /* CONFIG_NET_SCH_CLK_CPU */ | |
114 | ||
115 | #endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ | |
116 | ||
117 | #ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY | |
118 | #define PSCHED_TDIFF(tv1, tv2) \ | |
119 | ({ \ | |
120 | int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \ | |
121 | int __delta = (tv1).tv_usec - (tv2).tv_usec; \ | |
122 | if (__delta_sec) { \ | |
123 | switch (__delta_sec) { \ | |
124 | default: \ | |
125 | __delta = 0; \ | |
126 | case 2: \ | |
127 | __delta += 1000000; \ | |
128 | case 1: \ | |
129 | __delta += 1000000; \ | |
130 | } \ | |
131 | } \ | |
132 | __delta; \ | |
133 | }) | |
134 | ||
135 | static inline int | |
136 | psched_tod_diff(int delta_sec, int bound) | |
137 | { | |
138 | int delta; | |
139 | ||
140 | if (bound <= 1000000 || delta_sec > (0x7FFFFFFF/1000000)-1) | |
141 | return bound; | |
142 | delta = delta_sec * 1000000; | |
143 | if (delta > bound) | |
144 | delta = bound; | |
145 | return delta; | |
146 | } | |
147 | ||
148 | #define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \ | |
149 | ({ \ | |
150 | int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \ | |
151 | int __delta = (tv1).tv_usec - (tv2).tv_usec; \ | |
152 | switch (__delta_sec) { \ | |
153 | default: \ | |
154 | __delta = psched_tod_diff(__delta_sec, bound); break; \ | |
155 | case 2: \ | |
156 | __delta += 1000000; \ | |
157 | case 1: \ | |
158 | __delta += 1000000; \ | |
159 | case 0: ; \ | |
160 | } \ | |
161 | __delta; \ | |
162 | }) | |
163 | ||
164 | #define PSCHED_TLESS(tv1, tv2) (((tv1).tv_usec < (tv2).tv_usec && \ | |
165 | (tv1).tv_sec <= (tv2).tv_sec) || \ | |
166 | (tv1).tv_sec < (tv2).tv_sec) | |
167 | ||
168 | #define PSCHED_TADD2(tv, delta, tv_res) \ | |
169 | ({ \ | |
170 | int __delta = (tv).tv_usec + (delta); \ | |
171 | (tv_res).tv_sec = (tv).tv_sec; \ | |
172 | if (__delta > 1000000) { (tv_res).tv_sec++; __delta -= 1000000; } \ | |
173 | (tv_res).tv_usec = __delta; \ | |
174 | }) | |
175 | ||
176 | #define PSCHED_TADD(tv, delta) \ | |
177 | ({ \ | |
178 | (tv).tv_usec += (delta); \ | |
179 | if ((tv).tv_usec > 1000000) { (tv).tv_sec++; \ | |
180 | (tv).tv_usec -= 1000000; } \ | |
181 | }) | |
182 | ||
183 | /* Set/check that time is in the "past perfect"; | |
184 | it depends on concrete representation of system time | |
185 | */ | |
186 | ||
187 | #define PSCHED_SET_PASTPERFECT(t) ((t).tv_sec = 0) | |
188 | #define PSCHED_IS_PASTPERFECT(t) ((t).tv_sec == 0) | |
189 | ||
190 | #define PSCHED_AUDIT_TDIFF(t) ({ if ((t) > 2000000) (t) = 2000000; }) | |
191 | ||
192 | #else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ | |
193 | ||
194 | #define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2)) | |
195 | #define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \ | |
196 | min_t(long long, (tv1) - (tv2), bound) | |
197 | ||
198 | ||
199 | #define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2)) | |
200 | #define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta)) | |
201 | #define PSCHED_TADD(tv, delta) ((tv) += (delta)) | |
202 | #define PSCHED_SET_PASTPERFECT(t) ((t) = 0) | |
203 | #define PSCHED_IS_PASTPERFECT(t) ((t) == 0) | |
204 | #define PSCHED_AUDIT_TDIFF(t) | |
205 | ||
206 | #endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */ | |
207 | ||
208 | extern struct Qdisc noop_qdisc; | |
209 | extern struct Qdisc_ops noop_qdisc_ops; | |
210 | extern struct Qdisc_ops pfifo_qdisc_ops; | |
211 | extern struct Qdisc_ops bfifo_qdisc_ops; | |
212 | ||
213 | extern int register_qdisc(struct Qdisc_ops *qops); | |
214 | extern int unregister_qdisc(struct Qdisc_ops *qops); | |
215 | extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); | |
216 | extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); | |
217 | extern void dev_init_scheduler(struct net_device *dev); | |
218 | extern void dev_shutdown(struct net_device *dev); | |
219 | extern void dev_activate(struct net_device *dev); | |
220 | extern void dev_deactivate(struct net_device *dev); | |
221 | extern void qdisc_reset(struct Qdisc *qdisc); | |
222 | extern void qdisc_destroy(struct Qdisc *qdisc); | |
223 | extern struct Qdisc * qdisc_create_dflt(struct net_device *dev, | |
224 | struct Qdisc_ops *ops); | |
225 | extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, | |
226 | struct rtattr *tab); | |
227 | extern void qdisc_put_rtab(struct qdisc_rate_table *tab); | |
228 | ||
229 | extern int qdisc_restart(struct net_device *dev); | |
230 | ||
231 | static inline void qdisc_run(struct net_device *dev) | |
232 | { | |
233 | while (!netif_queue_stopped(dev) && qdisc_restart(dev) < 0) | |
234 | /* NOTHING */; | |
235 | } | |
236 | ||
237 | extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, | |
238 | struct tcf_result *res); | |
239 | ||
240 | /* Calculate maximal size of packet seen by hard_start_xmit | |
241 | routine of this device. | |
242 | */ | |
243 | static inline unsigned psched_mtu(struct net_device *dev) | |
244 | { | |
245 | unsigned mtu = dev->mtu; | |
246 | return dev->hard_header ? mtu + dev->hard_header_len : mtu; | |
247 | } | |
248 | ||
249 | #endif |