1 #ifndef __NET_PKT_SCHED_H
2 #define __NET_PKT_SCHED_H
4 #include <linux/jiffies.h>
5 #include <linux/ktime.h>
6 #include <net/sch_generic.h>
13 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
16 #define QDISC_ALIGNTO 32
17 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
19 static inline void *qdisc_priv(struct Qdisc *q)
21 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
25 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
27 Normal IP packet size ~ 512byte, hence:
29 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
32 10msec resolution -> <50Kbit/sec.
34 The result: [34]86 is not good choice for QoS router :-(
36 The things are not so bad, because we may use artifical
37 clock evaluated by integration of network data flow
38 in the most critical places.
41 typedef u64 psched_time_t;
42 typedef long psched_tdiff_t;
44 /* Avoid doing 64 bit divide */
45 #define PSCHED_SHIFT 6
46 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
47 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
49 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
50 #define PSCHED_PASTPERFECT 0
52 static inline psched_time_t psched_get_time(void)
54 return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
57 static inline psched_tdiff_t
58 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
60 return min(tv1 - tv2, bound);
63 struct qdisc_watchdog {
68 extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
69 extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
70 psched_time_t expires);
71 extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
73 extern struct Qdisc_ops pfifo_qdisc_ops;
74 extern struct Qdisc_ops bfifo_qdisc_ops;
76 extern int fifo_set_limit(struct Qdisc *q, unsigned int limit);
77 extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
80 extern int register_qdisc(struct Qdisc_ops *qops);
81 extern int unregister_qdisc(struct Qdisc_ops *qops);
82 extern void qdisc_list_del(struct Qdisc *q);
83 extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
84 extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
85 extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
87 extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
88 extern void qdisc_put_stab(struct qdisc_size_table *tab);
89 extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc);
91 extern void __qdisc_run(struct Qdisc *q);
93 static inline void qdisc_run(struct Qdisc *q)
95 if (!test_and_set_bit(__QDISC_STATE_RUNNING, &q->state))
99 extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp,
100 struct tcf_result *res);
101 extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
102 struct tcf_result *res);
104 /* Calculate maximal size of packet seen by hard_start_xmit
105 routine of this device.
107 static inline unsigned psched_mtu(const struct net_device *dev)
109 return dev->mtu + dev->hard_header_len;