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[NET_SCHED]: Add hrtimer based qdisc watchdog 

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-03-16 01:19:15 -07:00 committed by David S. Miller
parent 641b9e0e8b
commit 4179477f63
2 changed files with 46 additions and 0 deletions
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10
include/net/pkt_sched.h
View File

@ -64,6 +64,16 @@ typedef long psched_tdiff_t;
#define PSCHED_IS_PASTPERFECT(t) ((t) == 0)
#define PSCHED_AUDIT_TDIFF(t)
struct qdisc_watchdog {
struct hrtimer timer;
struct Qdisc *qdisc;
};
extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
psched_time_t expires);
extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
extern struct Qdisc_ops pfifo_qdisc_ops;
extern struct Qdisc_ops bfifo_qdisc_ops;

36
net/sched/sch_api.c
View File

@ -34,6 +34,7 @@
#include <linux/kmod.h>
#include <linux/list.h>
#include <linux/bitops.h>
#include <linux/hrtimer.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
@ -291,6 +292,41 @@ void qdisc_put_rtab(struct qdisc_rate_table *tab)
}
}
static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
{
struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
timer);
wd->qdisc->flags &= ~TCQ_F_THROTTLED;
netif_schedule(wd->qdisc->dev);
return HRTIMER_NORESTART;
}
void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
{
hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
wd->timer.function = qdisc_watchdog;
wd->qdisc = qdisc;
}
EXPORT_SYMBOL(qdisc_watchdog_init);
void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires)
{
ktime_t time;
wd->qdisc->flags |= TCQ_F_THROTTLED;
time = ktime_set(0, 0);
time = ktime_add_ns(time, PSCHED_US2NS(expires));
hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS);
}
EXPORT_SYMBOL(qdisc_watchdog_schedule);
void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
{
hrtimer_cancel(&wd->timer);
wd->qdisc->flags &= ~TCQ_F_THROTTLED;
}
EXPORT_SYMBOL(qdisc_watchdog_cancel);
/* Allocate an unique handle from space managed by kernel */