mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 17:54:13 +08:00
2266d8886f
In PSCHED_TADD and PSCHED_TADD2, if delta is less than tv.tv_usec (so,
less than USEC_PER_SEC too) then tv_res will be smaller than tv. The
affectation "(tv_res).tv_usec = __delta;" is wrong. The fix is to
revert to the original code before
4ee303dfea and change the 'if' in
'while'.
[Shuya MAEDA: "while (__delta >= USEC_PER_SEC){ ... }" instead of
"while (__delta > USEC_PER_SEC){ ... }"]
Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
243 lines
6.7 KiB
C
243 lines
6.7 KiB
C
#ifndef __NET_PKT_SCHED_H
|
|
#define __NET_PKT_SCHED_H
|
|
|
|
#include <linux/jiffies.h>
|
|
#include <net/sch_generic.h>
|
|
|
|
struct qdisc_walker
|
|
{
|
|
int stop;
|
|
int skip;
|
|
int count;
|
|
int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
|
|
};
|
|
|
|
extern rwlock_t qdisc_tree_lock;
|
|
|
|
#define QDISC_ALIGNTO 32
|
|
#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
|
|
|
|
static inline void *qdisc_priv(struct Qdisc *q)
|
|
{
|
|
return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
|
|
}
|
|
|
|
/*
|
|
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.
|
|
*/
|
|
|
|
/* General note about internal clock.
|
|
|
|
Any clock source returns time intervals, measured in units
|
|
close to 1usec. With source CONFIG_NET_SCH_CLK_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.
|
|
*/
|
|
|
|
|
|
#ifdef CONFIG_NET_SCH_CLK_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_to_jiffies(usecs)
|
|
#define PSCHED_JIFFIE2US(delay) jiffies_to_usecs(delay)
|
|
|
|
#else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
|
|
|
|
typedef u64 psched_time_t;
|
|
typedef long psched_tdiff_t;
|
|
|
|
#ifdef CONFIG_NET_SCH_CLK_JIFFIES
|
|
|
|
#if HZ < 96
|
|
#define PSCHED_JSCALE 14
|
|
#elif HZ >= 96 && HZ < 192
|
|
#define PSCHED_JSCALE 13
|
|
#elif HZ >= 192 && HZ < 384
|
|
#define PSCHED_JSCALE 12
|
|
#elif HZ >= 384 && HZ < 768
|
|
#define PSCHED_JSCALE 11
|
|
#elif HZ >= 768
|
|
#define PSCHED_JSCALE 10
|
|
#endif
|
|
|
|
#define PSCHED_GET_TIME(stamp) ((stamp) = (get_jiffies_64()<<PSCHED_JSCALE))
|
|
#define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE)
|
|
#define PSCHED_JIFFIE2US(delay) ((delay)<<PSCHED_JSCALE)
|
|
|
|
#endif /* CONFIG_NET_SCH_CLK_JIFFIES */
|
|
#ifdef CONFIG_NET_SCH_CLK_CPU
|
|
#include <asm/timex.h>
|
|
|
|
extern psched_tdiff_t psched_clock_per_hz;
|
|
extern int psched_clock_scale;
|
|
extern psched_time_t psched_time_base;
|
|
extern cycles_t psched_time_mark;
|
|
|
|
#define PSCHED_GET_TIME(stamp) \
|
|
do { \
|
|
cycles_t cur = get_cycles(); \
|
|
if (sizeof(cycles_t) == sizeof(u32)) { \
|
|
if (cur <= psched_time_mark) \
|
|
psched_time_base += 0x100000000ULL; \
|
|
psched_time_mark = cur; \
|
|
(stamp) = (psched_time_base + cur)>>psched_clock_scale; \
|
|
} else { \
|
|
(stamp) = cur>>psched_clock_scale; \
|
|
} \
|
|
} while (0)
|
|
#define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz)
|
|
#define PSCHED_JIFFIE2US(delay) ((delay)*psched_clock_per_hz)
|
|
|
|
#endif /* CONFIG_NET_SCH_CLK_CPU */
|
|
|
|
#endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
|
|
|
|
#ifdef CONFIG_NET_SCH_CLK_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 += USEC_PER_SEC; \
|
|
case 1: \
|
|
__delta += USEC_PER_SEC; \
|
|
} \
|
|
} \
|
|
__delta; \
|
|
})
|
|
|
|
static inline int
|
|
psched_tod_diff(int delta_sec, int bound)
|
|
{
|
|
int delta;
|
|
|
|
if (bound <= USEC_PER_SEC || delta_sec > (0x7FFFFFFF/USEC_PER_SEC)-1)
|
|
return bound;
|
|
delta = delta_sec * USEC_PER_SEC;
|
|
if (delta > bound || delta < 0)
|
|
delta = bound;
|
|
return delta;
|
|
}
|
|
|
|
#define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \
|
|
({ \
|
|
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); break; \
|
|
case 2: \
|
|
__delta += USEC_PER_SEC; \
|
|
case 1: \
|
|
__delta += USEC_PER_SEC; \
|
|
case 0: \
|
|
if (__delta > bound || __delta < 0) \
|
|
__delta = bound; \
|
|
} \
|
|
__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; \
|
|
while (__delta >= USEC_PER_SEC) { (tv_res).tv_sec++; __delta -= USEC_PER_SEC; } \
|
|
(tv_res).tv_usec = __delta; \
|
|
})
|
|
|
|
#define PSCHED_TADD(tv, delta) \
|
|
({ \
|
|
(tv).tv_usec += (delta); \
|
|
while ((tv).tv_usec >= USEC_PER_SEC) { (tv).tv_sec++; \
|
|
(tv).tv_usec -= USEC_PER_SEC; } \
|
|
})
|
|
|
|
/* 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 /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
|
|
|
|
#define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2))
|
|
#define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \
|
|
min_t(long long, (tv1) - (tv2), bound)
|
|
|
|
|
|
#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 /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
|
|
|
|
extern struct Qdisc_ops pfifo_qdisc_ops;
|
|
extern struct Qdisc_ops bfifo_qdisc_ops;
|
|
|
|
extern int register_qdisc(struct Qdisc_ops *qops);
|
|
extern int unregister_qdisc(struct Qdisc_ops *qops);
|
|
extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
|
|
extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
|
|
extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
|
|
struct rtattr *tab);
|
|
extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
|
|
|
|
extern void __qdisc_run(struct net_device *dev);
|
|
|
|
static inline void qdisc_run(struct net_device *dev)
|
|
{
|
|
if (!netif_queue_stopped(dev) &&
|
|
!test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
|
|
__qdisc_run(dev);
|
|
}
|
|
|
|
extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
|
|
struct tcf_result *res);
|
|
|
|
/* 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
|