1 #ifndef __NET_PKT_SCHED_H
2 #define __NET_PKT_SCHED_H
4 #define PSCHED_GETTIMEOFDAY 1
5 #define PSCHED_JIFFIES 2
8 #define PSCHED_CLOCK_SOURCE PSCHED_JIFFIES
10 #include <linux/config.h>
11 #include <linux/types.h>
12 #include <linux/pkt_sched.h>
13 #include <net/pkt_cls.h>
27 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
30 struct Qdisc_class_ops
32 /* Child qdisc manipulation */
33 int (*graft)(struct Qdisc *, unsigned long cl, struct Qdisc *, struct Qdisc **);
34 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
36 /* Class manipulation routines */
37 unsigned long (*get)(struct Qdisc *, u32 classid);
38 void (*put)(struct Qdisc *, unsigned long);
39 int (*change)(struct Qdisc *, u32, u32, struct rtattr **, unsigned long *);
40 int (*delete)(struct Qdisc *, unsigned long);
41 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
43 /* Filter manipulation */
44 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
45 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, u32 classid);
46 void (*unbind_tcf)(struct Qdisc *, unsigned long);
48 /* rtnetlink specific */
49 int (*dump)(struct Qdisc *, unsigned long, struct sk_buff *skb, struct tcmsg*);
54 struct Qdisc_ops *next;
55 struct Qdisc_class_ops *cl_ops;
59 int (*enqueue)(struct sk_buff *, struct Qdisc *);
60 struct sk_buff * (*dequeue)(struct Qdisc *);
61 int (*requeue)(struct sk_buff *, struct Qdisc *);
62 int (*drop)(struct Qdisc *);
64 int (*init)(struct Qdisc *, struct rtattr *arg);
65 void (*reset)(struct Qdisc *);
66 void (*destroy)(struct Qdisc *);
67 int (*change)(struct Qdisc *, struct rtattr *arg);
69 int (*dump)(struct Qdisc *, struct sk_buff *);
72 extern rwlock_t qdisc_tree_lock;
76 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
77 struct sk_buff * (*dequeue)(struct Qdisc *dev);
79 #define TCQ_F_BUILTIN 1
80 #define TCQ_F_THROTTLED 2
81 #define TCQ_F_INGRES 4
82 struct Qdisc_ops *ops;
86 struct sk_buff_head q;
87 struct net_device *dev;
89 struct tc_stats stats;
90 int (*reshape_fail)(struct sk_buff *skb, struct Qdisc *q);
92 /* This field is deprecated, but it is still used by CBQ
93 * and it will live until better solution will be invented.
95 struct Qdisc *__parent;
100 struct qdisc_rate_table
102 struct tc_ratespec rate;
104 struct qdisc_rate_table *next;
108 static inline void sch_tree_lock(struct Qdisc *q)
110 write_lock(&qdisc_tree_lock);
111 spin_lock_bh(&q->dev->queue_lock);
114 static inline void sch_tree_unlock(struct Qdisc *q)
116 spin_unlock_bh(&q->dev->queue_lock);
117 write_unlock(&qdisc_tree_lock);
120 static inline void tcf_tree_lock(struct tcf_proto *tp)
122 write_lock(&qdisc_tree_lock);
123 spin_lock_bh(&tp->q->dev->queue_lock);
126 static inline void tcf_tree_unlock(struct tcf_proto *tp)
128 spin_unlock_bh(&tp->q->dev->queue_lock);
129 write_unlock(&qdisc_tree_lock);
133 static inline unsigned long
134 cls_set_class(struct tcf_proto *tp, unsigned long *clp, unsigned long cl)
136 unsigned long old_cl;
145 static inline unsigned long
146 __cls_set_class(unsigned long *clp, unsigned long cl)
148 unsigned long old_cl;
157 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
159 Normal IP packet size ~ 512byte, hence:
161 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
164 10msec resolution -> <50Kbit/sec.
166 The result: [34]86 is not good choice for QoS router :-(
168 The things are not so bad, because we may use artifical
169 clock evaluated by integration of network data flow
170 in the most critical places.
172 Note: we do not use fastgettimeofday.
173 The reason is that, when it is not the same thing as
174 gettimeofday, it returns invalid timestamp, which is
175 not updated, when net_bh is active.
177 So, use PSCHED_CLOCK_SOURCE = PSCHED_CPU on alpha and pentiums
178 with rtdsc. And PSCHED_JIFFIES on all other architectures, including [34]86
179 and pentiums without rtdsc.
180 You can use PSCHED_GETTIMEOFDAY on another architectures,
181 which have fast and precise clock source, but it is too expensive.
184 /* General note about internal clock.
186 Any clock source returns time intervals, measured in units
187 close to 1usec. With source PSCHED_GETTIMEOFDAY it is precisely
188 microseconds, otherwise something close but different chosen to minimize
189 arithmetic cost. Ratio usec/internal untis in form nominator/denominator
190 may be read from /proc/net/psched.
194 #if PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY
196 typedef struct timeval psched_time_t;
197 typedef long psched_tdiff_t;
199 #define PSCHED_GET_TIME(stamp) do_gettimeofday(&(stamp))
200 #define PSCHED_US2JIFFIE(usecs) (((usecs)+(1000000/HZ-1))/(1000000/HZ))
202 #define PSCHED_EXPORTLIST EXPORT_SYMBOL(psched_tod_diff);
204 #else /* PSCHED_CLOCK_SOURCE != PSCHED_GETTIMEOFDAY */
206 #define PSCHED_EXPORTLIST PSCHED_EXPORTLIST_1 PSCHED_EXPORTLIST_2
208 typedef u64 psched_time_t;
209 typedef long psched_tdiff_t;
211 extern psched_time_t psched_time_base;
213 #if PSCHED_CLOCK_SOURCE == PSCHED_JIFFIES
216 #define PSCHED_JSCALE 13
218 #define PSCHED_JSCALE 10
220 #define PSCHED_JSCALE 0
223 #define PSCHED_EXPORTLIST_2
225 #if BITS_PER_LONG <= 32
227 #define PSCHED_WATCHER unsigned long
229 extern PSCHED_WATCHER psched_time_mark;
231 #define PSCHED_GET_TIME(stamp) ((stamp) = psched_time_base + (((unsigned long)(jiffies-psched_time_mark))<<PSCHED_JSCALE))
233 #define PSCHED_EXPORTLIST_1 EXPORT_SYMBOL(psched_time_base); \
234 EXPORT_SYMBOL(psched_time_mark);
238 #define PSCHED_GET_TIME(stamp) ((stamp) = (jiffies<<PSCHED_JSCALE))
240 #define PSCHED_EXPORTLIST_1
244 #define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE)
246 #elif PSCHED_CLOCK_SOURCE == PSCHED_CPU
248 extern psched_tdiff_t psched_clock_per_hz;
249 extern int psched_clock_scale;
251 #define PSCHED_EXPORTLIST_2 EXPORT_SYMBOL(psched_clock_per_hz); \
252 EXPORT_SYMBOL(psched_clock_scale);
254 #define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz)
256 #ifdef CONFIG_X86_TSC
258 #define PSCHED_GET_TIME(stamp) \
261 (stamp) = __cur>>psched_clock_scale; \
264 #define PSCHED_EXPORTLIST_1
266 #elif defined (__alpha__)
268 #define PSCHED_WATCHER u32
270 extern PSCHED_WATCHER psched_time_mark;
272 #define PSCHED_GET_TIME(stamp) \
274 __asm__ __volatile__ ("rpcc %0" : "r="(__res)); \
275 if (__res <= psched_time_mark) psched_time_base += 0x100000000UL; \
276 psched_time_mark = __res; \
277 (stamp) = (psched_time_base + __res)>>psched_clock_scale; \
280 #define PSCHED_EXPORTLIST_1 EXPORT_SYMBOL(psched_time_base); \
281 EXPORT_SYMBOL(psched_time_mark);
285 #error PSCHED_CLOCK_SOURCE=PSCHED_CPU is not supported on this arch.
289 #endif /* PSCHED_CLOCK_SOURCE == PSCHED_JIFFIES */
291 #endif /* PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY */
293 #if PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY
294 #define PSCHED_TDIFF(tv1, tv2) \
296 int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
297 int __delta = (tv1).tv_usec - (tv2).tv_usec; \
299 switch (__delta_sec) { \
303 __delta += 1000000; \
305 __delta += 1000000; \
311 extern int psched_tod_diff(int delta_sec, int bound);
313 #define PSCHED_TDIFF_SAFE(tv1, tv2, bound, guard) \
315 int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
316 int __delta = (tv1).tv_usec - (tv2).tv_usec; \
317 switch (__delta_sec) { \
319 __delta = psched_tod_diff(__delta_sec, bound); guard; break; \
321 __delta += 1000000; \
323 __delta += 1000000; \
329 #define PSCHED_TLESS(tv1, tv2) (((tv1).tv_usec < (tv2).tv_usec && \
330 (tv1).tv_sec <= (tv2).tv_sec) || \
331 (tv1).tv_sec < (tv2).tv_sec)
333 #define PSCHED_TADD2(tv, delta, tv_res) \
335 int __delta = (tv).tv_usec + (delta); \
336 (tv_res).tv_sec = (tv).tv_sec; \
337 if (__delta > 1000000) { (tv_res).tv_sec++; __delta -= 1000000; } \
338 (tv_res).tv_usec = __delta; \
341 #define PSCHED_TADD(tv, delta) \
343 (tv).tv_usec += (delta); \
344 if ((tv).tv_usec > 1000000) { (tv).tv_sec++; \
345 (tv).tv_usec -= 1000000; } \
348 /* Set/check that time is in the "past perfect";
349 it depends on concrete representation of system time
352 #define PSCHED_SET_PASTPERFECT(t) ((t).tv_sec = 0)
353 #define PSCHED_IS_PASTPERFECT(t) ((t).tv_sec == 0)
355 #define PSCHED_AUDIT_TDIFF(t) ({ if ((t) > 2000000) (t) = 2000000; })
359 #define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2))
360 #define PSCHED_TDIFF_SAFE(tv1, tv2, bound, guard) \
362 long long __delta = (tv1) - (tv2); \
363 if ( __delta > (long long)(bound)) { __delta = (bound); guard; } \
368 #define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2))
369 #define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta))
370 #define PSCHED_TADD(tv, delta) ((tv) += (delta))
371 #define PSCHED_SET_PASTPERFECT(t) ((t) = 0)
372 #define PSCHED_IS_PASTPERFECT(t) ((t) == 0)
373 #define PSCHED_AUDIT_TDIFF(t)
379 struct tcf_police *next;
393 struct qdisc_rate_table *R_tab;
394 struct qdisc_rate_table *P_tab;
396 struct tc_stats stats;
399 extern int qdisc_copy_stats(struct sk_buff *skb, struct tc_stats *st);
400 extern void tcf_police_destroy(struct tcf_police *p);
401 extern struct tcf_police * tcf_police_locate(struct rtattr *rta, struct rtattr *est);
402 extern int tcf_police_dump(struct sk_buff *skb, struct tcf_police *p);
403 extern int tcf_police(struct sk_buff *skb, struct tcf_police *p);
405 static inline void tcf_police_release(struct tcf_police *p)
407 if (p && --p->refcnt == 0)
408 tcf_police_destroy(p);
411 extern struct Qdisc noop_qdisc;
412 extern struct Qdisc_ops noop_qdisc_ops;
413 extern struct Qdisc_ops pfifo_qdisc_ops;
414 extern struct Qdisc_ops bfifo_qdisc_ops;
416 int register_qdisc(struct Qdisc_ops *qops);
417 int unregister_qdisc(struct Qdisc_ops *qops);
418 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
419 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
420 void dev_init_scheduler(struct net_device *dev);
421 void dev_shutdown(struct net_device *dev);
422 void dev_activate(struct net_device *dev);
423 void dev_deactivate(struct net_device *dev);
424 void qdisc_reset(struct Qdisc *qdisc);
425 void qdisc_destroy(struct Qdisc *qdisc);
426 struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops);
427 int qdisc_new_estimator(struct tc_stats *stats, struct rtattr *opt);
428 void qdisc_kill_estimator(struct tc_stats *stats);
429 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab);
430 void qdisc_put_rtab(struct qdisc_rate_table *tab);
432 int tc_filter_init(void);
433 int pktsched_init(void);
435 extern int qdisc_restart(struct net_device *dev);
437 static inline void qdisc_run(struct net_device *dev)
439 while (!netif_queue_stopped(dev) &&
440 qdisc_restart(dev)<0)
444 /* Calculate maximal size of packet seen by hard_start_xmit
445 routine of this device.
447 static inline unsigned psched_mtu(struct net_device *dev)
449 unsigned mtu = dev->mtu;
450 return dev->hard_header ? mtu + dev->hard_header_len : mtu;