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 unsigned 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_INGRESS 4
82 struct Qdisc_ops *ops;
86 struct sk_buff_head q;
87 struct net_device *dev;
88 struct list_head list;
90 struct tc_stats stats;
91 int (*reshape_fail)(struct sk_buff *skb, struct Qdisc *q);
93 /* This field is deprecated, but it is still used by CBQ
94 * and it will live until better solution will be invented.
96 struct Qdisc *__parent;
101 struct qdisc_rate_table
103 struct tc_ratespec rate;
105 struct qdisc_rate_table *next;
109 static inline void sch_tree_lock(struct Qdisc *q)
111 write_lock(&qdisc_tree_lock);
112 spin_lock_bh(&q->dev->queue_lock);
115 static inline void sch_tree_unlock(struct Qdisc *q)
117 spin_unlock_bh(&q->dev->queue_lock);
118 write_unlock(&qdisc_tree_lock);
121 static inline void tcf_tree_lock(struct tcf_proto *tp)
123 write_lock(&qdisc_tree_lock);
124 spin_lock_bh(&tp->q->dev->queue_lock);
127 static inline void tcf_tree_unlock(struct tcf_proto *tp)
129 spin_unlock_bh(&tp->q->dev->queue_lock);
130 write_unlock(&qdisc_tree_lock);
134 static inline unsigned long
135 cls_set_class(struct tcf_proto *tp, unsigned long *clp, unsigned long cl)
137 unsigned long old_cl;
146 static inline unsigned long
147 __cls_set_class(unsigned long *clp, unsigned long cl)
149 unsigned long old_cl;
158 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
160 Normal IP packet size ~ 512byte, hence:
162 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
165 10msec resolution -> <50Kbit/sec.
167 The result: [34]86 is not good choice for QoS router :-(
169 The things are not so bad, because we may use artifical
170 clock evaluated by integration of network data flow
171 in the most critical places.
173 Note: we do not use fastgettimeofday.
174 The reason is that, when it is not the same thing as
175 gettimeofday, it returns invalid timestamp, which is
176 not updated, when net_bh is active.
178 So, use PSCHED_CLOCK_SOURCE = PSCHED_CPU on alpha and pentiums
179 with rtdsc. And PSCHED_JIFFIES on all other architectures, including [34]86
180 and pentiums without rtdsc.
181 You can use PSCHED_GETTIMEOFDAY on another architectures,
182 which have fast and precise clock source, but it is too expensive.
185 /* General note about internal clock.
187 Any clock source returns time intervals, measured in units
188 close to 1usec. With source PSCHED_GETTIMEOFDAY it is precisely
189 microseconds, otherwise something close but different chosen to minimize
190 arithmetic cost. Ratio usec/internal untis in form nominator/denominator
191 may be read from /proc/net/psched.
195 #if PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY
197 typedef struct timeval psched_time_t;
198 typedef long psched_tdiff_t;
200 #define PSCHED_GET_TIME(stamp) do_gettimeofday(&(stamp))
201 #define PSCHED_US2JIFFIE(usecs) (((usecs)+(1000000/HZ-1))/(1000000/HZ))
202 #define PSCHED_JIFFIE2US(delay) ((delay)*(1000000/HZ))
204 #define PSCHED_EXPORTLIST EXPORT_SYMBOL(psched_tod_diff);
206 #else /* PSCHED_CLOCK_SOURCE != PSCHED_GETTIMEOFDAY */
208 #define PSCHED_EXPORTLIST PSCHED_EXPORTLIST_1 PSCHED_EXPORTLIST_2
210 typedef u64 psched_time_t;
211 typedef long psched_tdiff_t;
213 extern psched_time_t psched_time_base;
215 #if PSCHED_CLOCK_SOURCE == PSCHED_JIFFIES
218 #define PSCHED_JSCALE 14
219 #elif HZ >= 96 && HZ < 192
220 #define PSCHED_JSCALE 13
221 #elif HZ >= 192 && HZ < 384
222 #define PSCHED_JSCALE 12
223 #elif HZ >= 384 && HZ < 768
224 #define PSCHED_JSCALE 11
226 #define PSCHED_JSCALE 10
229 #define PSCHED_EXPORTLIST_2
231 #if BITS_PER_LONG <= 32
233 #define PSCHED_WATCHER unsigned long
235 extern PSCHED_WATCHER psched_time_mark;
237 #define PSCHED_GET_TIME(stamp) ((stamp) = psched_time_base + (((unsigned long)(jiffies-psched_time_mark))<<PSCHED_JSCALE))
239 #define PSCHED_EXPORTLIST_1 EXPORT_SYMBOL(psched_time_base); \
240 EXPORT_SYMBOL(psched_time_mark);
244 #define PSCHED_GET_TIME(stamp) ((stamp) = (jiffies<<PSCHED_JSCALE))
246 #define PSCHED_EXPORTLIST_1
250 #define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE)
251 #define PSCHED_JIFFIE2US(delay) ((delay)<<PSCHED_JSCALE)
253 #elif PSCHED_CLOCK_SOURCE == PSCHED_CPU
255 extern psched_tdiff_t psched_clock_per_hz;
256 extern int psched_clock_scale;
258 #define PSCHED_EXPORTLIST_2 EXPORT_SYMBOL(psched_clock_per_hz); \
259 EXPORT_SYMBOL(psched_clock_scale);
261 #define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz)
262 #define PSCHED_JIFFIE2US(delay) ((delay)*psched_clock_per_hz)
264 #ifdef CONFIG_X86_TSC
266 #define PSCHED_GET_TIME(stamp) \
269 (stamp) = __cur>>psched_clock_scale; \
272 #define PSCHED_EXPORTLIST_1
274 #elif defined (__alpha__)
276 #define PSCHED_WATCHER u32
278 extern PSCHED_WATCHER psched_time_mark;
280 #define PSCHED_GET_TIME(stamp) \
282 __asm__ __volatile__ ("rpcc %0" : "r="(__res)); \
283 if (__res <= psched_time_mark) psched_time_base += 0x100000000UL; \
284 psched_time_mark = __res; \
285 (stamp) = (psched_time_base + __res)>>psched_clock_scale; \
288 #define PSCHED_EXPORTLIST_1 EXPORT_SYMBOL(psched_time_base); \
289 EXPORT_SYMBOL(psched_time_mark);
293 #error PSCHED_CLOCK_SOURCE=PSCHED_CPU is not supported on this arch.
297 #endif /* PSCHED_CLOCK_SOURCE == PSCHED_JIFFIES */
299 #endif /* PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY */
301 #if PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY
302 #define PSCHED_TDIFF(tv1, tv2) \
304 int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
305 int __delta = (tv1).tv_usec - (tv2).tv_usec; \
307 switch (__delta_sec) { \
311 __delta += 1000000; \
313 __delta += 1000000; \
319 extern int psched_tod_diff(int delta_sec, int bound);
321 #define PSCHED_TDIFF_SAFE(tv1, tv2, bound, guard) \
323 int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
324 int __delta = (tv1).tv_usec - (tv2).tv_usec; \
325 switch (__delta_sec) { \
327 __delta = psched_tod_diff(__delta_sec, bound); guard; break; \
329 __delta += 1000000; \
331 __delta += 1000000; \
337 #define PSCHED_TLESS(tv1, tv2) (((tv1).tv_usec < (tv2).tv_usec && \
338 (tv1).tv_sec <= (tv2).tv_sec) || \
339 (tv1).tv_sec < (tv2).tv_sec)
341 #define PSCHED_TADD2(tv, delta, tv_res) \
343 int __delta = (tv).tv_usec + (delta); \
344 (tv_res).tv_sec = (tv).tv_sec; \
345 if (__delta > 1000000) { (tv_res).tv_sec++; __delta -= 1000000; } \
346 (tv_res).tv_usec = __delta; \
349 #define PSCHED_TADD(tv, delta) \
351 (tv).tv_usec += (delta); \
352 if ((tv).tv_usec > 1000000) { (tv).tv_sec++; \
353 (tv).tv_usec -= 1000000; } \
356 /* Set/check that time is in the "past perfect";
357 it depends on concrete representation of system time
360 #define PSCHED_SET_PASTPERFECT(t) ((t).tv_sec = 0)
361 #define PSCHED_IS_PASTPERFECT(t) ((t).tv_sec == 0)
363 #define PSCHED_AUDIT_TDIFF(t) ({ if ((t) > 2000000) (t) = 2000000; })
367 #define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2))
368 #define PSCHED_TDIFF_SAFE(tv1, tv2, bound, guard) \
370 long long __delta = (tv1) - (tv2); \
371 if ( __delta > (long long)(bound)) { __delta = (bound); guard; } \
376 #define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2))
377 #define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta))
378 #define PSCHED_TADD(tv, delta) ((tv) += (delta))
379 #define PSCHED_SET_PASTPERFECT(t) ((t) = 0)
380 #define PSCHED_IS_PASTPERFECT(t) ((t) == 0)
381 #define PSCHED_AUDIT_TDIFF(t)
387 struct tcf_police *next;
401 struct qdisc_rate_table *R_tab;
402 struct qdisc_rate_table *P_tab;
404 struct tc_stats stats;
407 extern int qdisc_copy_stats(struct sk_buff *skb, struct tc_stats *st);
408 extern void tcf_police_destroy(struct tcf_police *p);
409 extern struct tcf_police * tcf_police_locate(struct rtattr *rta, struct rtattr *est);
410 extern int tcf_police_dump(struct sk_buff *skb, struct tcf_police *p);
411 extern int tcf_police(struct sk_buff *skb, struct tcf_police *p);
413 static inline void tcf_police_release(struct tcf_police *p)
415 if (p && --p->refcnt == 0)
416 tcf_police_destroy(p);
419 extern struct Qdisc noop_qdisc;
420 extern struct Qdisc_ops noop_qdisc_ops;
421 extern struct Qdisc_ops pfifo_qdisc_ops;
422 extern struct Qdisc_ops bfifo_qdisc_ops;
424 int register_qdisc(struct Qdisc_ops *qops);
425 int unregister_qdisc(struct Qdisc_ops *qops);
426 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
427 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
428 void dev_init_scheduler(struct net_device *dev);
429 void dev_shutdown(struct net_device *dev);
430 void dev_activate(struct net_device *dev);
431 void dev_deactivate(struct net_device *dev);
432 void qdisc_reset(struct Qdisc *qdisc);
433 void qdisc_destroy(struct Qdisc *qdisc);
434 struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops);
435 int qdisc_new_estimator(struct tc_stats *stats, struct rtattr *opt);
436 void qdisc_kill_estimator(struct tc_stats *stats);
437 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab);
438 void qdisc_put_rtab(struct qdisc_rate_table *tab);
440 int tc_filter_init(void);
441 int pktsched_init(void);
443 extern int qdisc_restart(struct net_device *dev);
445 static inline void qdisc_run(struct net_device *dev)
447 while (!netif_queue_stopped(dev) &&
448 qdisc_restart(dev)<0)
452 /* Calculate maximal size of packet seen by hard_start_xmit
453 routine of this device.
455 static inline unsigned psched_mtu(struct net_device *dev)
457 unsigned mtu = dev->mtu;
458 return dev->hard_header ? mtu + dev->hard_header_len : mtu;