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#ifndef __NET_PKT_SCHED_H
#define __NET_PKT_SCHED_H
#define PSCHED_GETTIMEOFDAY 1
#define PSCHED_JIFFIES 2
#define PSCHED_CPU 3
#define PSCHED_CLOCK_SOURCE PSCHED_JIFFIES
#include <linux/config.h>
#include <linux/pkt_sched.h>
#include <net/pkt_cls.h>
#ifdef CONFIG_X86_TSC
#include <asm/msr.h>
#endif
struct rtattr;
struct Qdisc;
struct qdisc_walker
{
int stop;
int skip;
int count;
int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
};
struct Qdisc_class_ops
{
/* Child qdisc manipulation */
int (*graft)(struct Qdisc *, unsigned long cl, struct Qdisc *, struct Qdisc **);
struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
/* Class manipulation routines */
unsigned long (*get)(struct Qdisc *, u32 classid);
void (*put)(struct Qdisc *, unsigned long);
int (*change)(struct Qdisc *, u32, u32, struct rtattr **, unsigned long *);
int (*delete)(struct Qdisc *, unsigned long);
void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
/* Filter manipulation */
struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, u32 classid);
void (*unbind_tcf)(struct Qdisc *, unsigned long);
/* rtnetlink specific */
int (*dump)(struct Qdisc *, unsigned long, struct sk_buff *skb, struct tcmsg*);
};
struct Qdisc_ops
{
struct Qdisc_ops *next;
struct Qdisc_class_ops *cl_ops;
char id[IFNAMSIZ];
int priv_size;
int (*enqueue)(struct sk_buff *, struct Qdisc *);
struct sk_buff * (*dequeue)(struct Qdisc *);
int (*requeue)(struct sk_buff *, struct Qdisc *);
int (*drop)(struct Qdisc *);
int (*init)(struct Qdisc *, struct rtattr *arg);
void (*reset)(struct Qdisc *);
void (*destroy)(struct Qdisc *);
int (*change)(struct Qdisc *, struct rtattr *arg);
int (*dump)(struct Qdisc *, struct sk_buff *);
};
extern rwlock_t qdisc_tree_lock;
struct Qdisc
{
int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
struct sk_buff * (*dequeue)(struct Qdisc *dev);
unsigned flags;
#define TCQ_F_BUILTIN 1
#define TCQ_F_THROTTLED 2
#define TCQ_F_INGRES 4
struct Qdisc_ops *ops;
struct Qdisc *next;
u32 handle;
atomic_t refcnt;
struct sk_buff_head q;
struct net_device *dev;
struct tc_stats stats;
int (*reshape_fail)(struct sk_buff *skb, struct Qdisc *q);
/* This field is deprecated, but it is still used by CBQ
* and it will live until better solution will be invented.
*/
struct Qdisc *__parent;
char data[0];
};
struct qdisc_rate_table
{
struct tc_ratespec rate;
u32 data[256];
struct qdisc_rate_table *next;
int refcnt;
};
static inline void sch_tree_lock(struct Qdisc *q)
{
write_lock(&qdisc_tree_lock);
spin_lock_bh(&q->dev->queue_lock);
}
static inline void sch_tree_unlock(struct Qdisc *q)
{
spin_unlock_bh(&q->dev->queue_lock);
write_unlock(&qdisc_tree_lock);
}
static inline void tcf_tree_lock(struct tcf_proto *tp)
{
write_lock(&qdisc_tree_lock);
spin_lock_bh(&tp->q->dev->queue_lock);
}
static inline void tcf_tree_unlock(struct tcf_proto *tp)
{
spin_unlock_bh(&tp->q->dev->queue_lock);
write_unlock(&qdisc_tree_lock);
}
static inline unsigned long
cls_set_class(struct tcf_proto *tp, unsigned long *clp, unsigned long cl)
{
unsigned long old_cl;
tcf_tree_lock(tp);
old_cl = *clp;
*clp = cl;
tcf_tree_unlock(tp);
return old_cl;
}
static inline unsigned long
__cls_set_class(unsigned long *clp, unsigned long cl)
{
unsigned long old_cl;
old_cl = *clp;
*clp = cl;
return old_cl;
}
/*
Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
Normal IP packet size ~ 512byte, hence:
0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
10Mbit ethernet.
10msec resolution -> <50Kbit/sec.
The result: [34]86 is not good choice for QoS router :-(
The things are not so bad, because we may use artifical
clock evaluated by integration of network data flow
in the most critical places.
Note: we do not use fastgettimeofday.
The reason is that, when it is not the same thing as
gettimeofday, it returns invalid timestamp, which is
not updated, when net_bh is active.
So, use PSCHED_CLOCK_SOURCE = PSCHED_CPU on alpha and pentiums
with rtdsc. And PSCHED_JIFFIES on all other architectures, including [34]86
and pentiums without rtdsc.
You can use PSCHED_GETTIMEOFDAY on another architectures,
which have fast and precise clock source, but it is too expensive.
*/
/* General note about internal clock.
Any clock source returns time intervals, measured in units
close to 1usec. With source PSCHED_GETTIMEOFDAY it is precisely
microseconds, otherwise something close but different chosen to minimize
arithmetic cost. Ratio usec/internal untis in form nominator/denominator
may be read from /proc/net/psched.
*/
#if PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY
typedef struct timeval psched_time_t;
typedef long psched_tdiff_t;
#define PSCHED_GET_TIME(stamp) do_gettimeofday(&(stamp))
#define PSCHED_US2JIFFIE(usecs) (((usecs)+(1000000/HZ-1))/(1000000/HZ))
#define PSCHED_EXPORTLIST EXPORT_SYMBOL(psched_tod_diff);
#else /* PSCHED_CLOCK_SOURCE != PSCHED_GETTIMEOFDAY */
#define PSCHED_EXPORTLIST PSCHED_EXPORTLIST_1 PSCHED_EXPORTLIST_2
typedef u64 psched_time_t;
typedef long psched_tdiff_t;
extern psched_time_t psched_time_base;
#if PSCHED_CLOCK_SOURCE == PSCHED_JIFFIES
#if HZ == 100
#define PSCHED_JSCALE 13
#elif HZ == 1024
#define PSCHED_JSCALE 10
#else
#define PSCHED_JSCALE 0
#endif
#define PSCHED_EXPORTLIST_2
#if ~0UL == 0xFFFFFFFF
#define PSCHED_WATCHER unsigned long
extern PSCHED_WATCHER psched_time_mark;
#define PSCHED_GET_TIME(stamp) ((stamp) = psched_time_base + (((unsigned long)(jiffies-psched_time_mark))<<PSCHED_JSCALE))
#define PSCHED_EXPORTLIST_1 EXPORT_SYMBOL(psched_time_base); \
EXPORT_SYMBOL(psched_time_mark);
#else
#define PSCHED_GET_TIME(stamp) ((stamp) = (jiffies<<PSCHED_JSCALE))
#define PSCHED_EXPORTLIST_1
#endif
#define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE)
#elif PSCHED_CLOCK_SOURCE == PSCHED_CPU
extern psched_tdiff_t psched_clock_per_hz;
extern int psched_clock_scale;
#define PSCHED_EXPORTLIST_2 EXPORT_SYMBOL(psched_clock_per_hz); \
EXPORT_SYMBOL(psched_clock_scale);
#define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz)
#ifdef CONFIG_X86_TSC
#define PSCHED_GET_TIME(stamp) \
({ u64 __cur; \
rdtscll(__cur); \
(stamp) = __cur>>psched_clock_scale; \
})
#define PSCHED_EXPORTLIST_1
#elif defined (__alpha__)
#define PSCHED_WATCHER u32
extern PSCHED_WATCHER psched_time_mark;
#define PSCHED_GET_TIME(stamp) \
({ u32 __res; \
__asm__ __volatile__ ("rpcc %0" : "r="(__res)); \
if (__res <= psched_time_mark) psched_time_base += 0x100000000UL; \
psched_time_mark = __res; \
(stamp) = (psched_time_base + __res)>>psched_clock_scale; \
})
#define PSCHED_EXPORTLIST_1 EXPORT_SYMBOL(psched_time_base); \
EXPORT_SYMBOL(psched_time_mark);
#else
#error PSCHED_CLOCK_SOURCE=PSCHED_CPU is not supported on this arch.
#endif /* ARCH */
#endif /* PSCHED_CLOCK_SOURCE == PSCHED_JIFFIES */
#endif /* PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY */
#if PSCHED_CLOCK_SOURCE == PSCHED_GETTIMEOFDAY
#define PSCHED_TDIFF(tv1, tv2) \
({ \
int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
int __delta = (tv1).tv_usec - (tv2).tv_usec; \
if (__delta_sec) { \
switch (__delta_sec) { \
default: \
__delta = 0; \
case 2: \
__delta += 1000000; \
case 1: \
__delta += 1000000; \
} \
} \
__delta; \
})
extern int psched_tod_diff(int delta_sec, int bound);
#define PSCHED_TDIFF_SAFE(tv1, tv2, bound, guard) \
({ \
int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
int __delta = (tv1).tv_usec - (tv2).tv_usec; \
switch (__delta_sec) { \
default: \
__delta = psched_tod_diff(__delta_sec, bound); guard; break; \
case 2: \
__delta += 1000000; \
case 1: \
__delta += 1000000; \
case 0: ; \
} \
__delta; \
})
#define PSCHED_TLESS(tv1, tv2) (((tv1).tv_usec < (tv2).tv_usec && \
(tv1).tv_sec <= (tv2).tv_sec) || \
(tv1).tv_sec < (tv2).tv_sec)
#define PSCHED_TADD2(tv, delta, tv_res) \
({ \
int __delta = (tv).tv_usec + (delta); \
(tv_res).tv_sec = (tv).tv_sec; \
if (__delta > 1000000) { (tv_res).tv_sec++; __delta -= 1000000; } \
(tv_res).tv_usec = __delta; \
})
#define PSCHED_TADD(tv, delta) \
({ \
(tv).tv_usec += (delta); \
if ((tv).tv_usec > 1000000) { (tv).tv_sec++; \
(tv).tv_usec -= 1000000; } \
})
/* Set/check that time is in the "past perfect";
it depends on concrete representation of system time
*/
#define PSCHED_SET_PASTPERFECT(t) ((t).tv_sec = 0)
#define PSCHED_IS_PASTPERFECT(t) ((t).tv_sec == 0)
#define PSCHED_AUDIT_TDIFF(t) ({ if ((t) > 2000000) (t) = 2000000; })
#else
#define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2))
#define PSCHED_TDIFF_SAFE(tv1, tv2, bound, guard) \
({ \
long __delta = (tv1) - (tv2); \
if ( __delta > (bound)) { __delta = (bound); guard; } \
__delta; \
})
#define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2))
#define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta))
#define PSCHED_TADD(tv, delta) ((tv) += (delta))
#define PSCHED_SET_PASTPERFECT(t) ((t) = 0)
#define PSCHED_IS_PASTPERFECT(t) ((t) == 0)
#define PSCHED_AUDIT_TDIFF(t)
#endif
struct tcf_police
{
struct tcf_police *next;
int refcnt;
u32 index;
int action;
int result;
u32 ewma_rate;
u32 burst;
u32 mtu;
u32 toks;
u32 ptoks;
psched_time_t t_c;
spinlock_t lock;
struct qdisc_rate_table *R_tab;
struct qdisc_rate_table *P_tab;
struct tc_stats stats;
};
extern int qdisc_copy_stats(struct sk_buff *skb, struct tc_stats *st);
extern void tcf_police_destroy(struct tcf_police *p);
extern struct tcf_police * tcf_police_locate(struct rtattr *rta, struct rtattr *est);
extern int tcf_police_dump(struct sk_buff *skb, struct tcf_police *p);
extern int tcf_police(struct sk_buff *skb, struct tcf_police *p);
static inline void tcf_police_release(struct tcf_police *p)
{
if (p && --p->refcnt == 0)
tcf_police_destroy(p);
}
extern struct Qdisc noop_qdisc;
extern struct Qdisc_ops noop_qdisc_ops;
extern struct Qdisc_ops pfifo_qdisc_ops;
extern struct Qdisc_ops bfifo_qdisc_ops;
int register_qdisc(struct Qdisc_ops *qops);
int unregister_qdisc(struct Qdisc_ops *qops);
struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
void dev_init_scheduler(struct net_device *dev);
void dev_shutdown(struct net_device *dev);
void dev_activate(struct net_device *dev);
void dev_deactivate(struct net_device *dev);
void qdisc_reset(struct Qdisc *qdisc);
void qdisc_destroy(struct Qdisc *qdisc);
struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops);
int qdisc_new_estimator(struct tc_stats *stats, struct rtattr *opt);
void qdisc_kill_estimator(struct tc_stats *stats);
struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab);
void qdisc_put_rtab(struct qdisc_rate_table *tab);
int teql_init(void);
int tc_filter_init(void);
int pktsched_init(void);
extern int qdisc_restart(struct net_device *dev);
static inline void qdisc_run(struct net_device *dev)
{
while (!netif_queue_stopped(dev) &&
qdisc_restart(dev)<0)
/* NOTHING */;
}
/* Calculate maximal size of packet seen by hard_start_xmit
routine of this device.
*/
static inline unsigned psched_mtu(struct net_device *dev)
{
unsigned mtu = dev->mtu;
return dev->hard_header ? mtu + dev->hard_header_len : mtu;
}
#endif
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