blob: 388bf8b6d06068558726943fa58d44a91ab01374 [file] [log] [blame]
#ifndef __NET_PKT_SCHED_H
#define __NET_PKT_SCHED_H
#include <linux/jiffies.h>
#include <linux/ktime.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 *);
#define QDISC_ALIGNTO 64
#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 artificial
clock evaluated by integration of network data flow
in the most critical places.
typedef u64 psched_time_t;
typedef long psched_tdiff_t;
/* Avoid doing 64 bit divide */
#define PSCHED_SHIFT 6
#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
static inline psched_time_t psched_get_time(void)
return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
static inline psched_tdiff_t
psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
return min(tv1 - tv2, bound);
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_ns(struct qdisc_watchdog *wd, u64 expires);
static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
psched_time_t expires)
qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
extern struct Qdisc_ops pfifo_qdisc_ops;
extern struct Qdisc_ops bfifo_qdisc_ops;
extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
extern int fifo_set_limit(struct Qdisc *q, unsigned int limit);
extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
unsigned int limit);
extern int register_qdisc(struct Qdisc_ops *qops);
extern int unregister_qdisc(struct Qdisc_ops *qops);
extern void qdisc_list_del(struct Qdisc *q);
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 nlattr *tab);
extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
extern void qdisc_put_stab(struct qdisc_size_table *tab);
extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc);
extern int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
struct net_device *dev, struct netdev_queue *txq,
spinlock_t *root_lock);
extern void __qdisc_run(struct Qdisc *q);
static inline void qdisc_run(struct Qdisc *q)
if (qdisc_run_begin(q))
extern int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res);
extern int tc_classify(struct sk_buff *skb, const 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 int psched_mtu(const struct net_device *dev)
return dev->mtu + dev->hard_header_len;