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 extern rwlock_t qdisc_tree_lock;
18 #define QDISC_ALIGNTO 32
19 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
21 static inline void *qdisc_priv(struct Qdisc *q)
23 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
27 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
29 Normal IP packet size ~ 512byte, hence:
31 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
34 10msec resolution -> <50Kbit/sec.
36 The result: [34]86 is not good choice for QoS router :-(
38 The things are not so bad, because we may use artifical
39 clock evaluated by integration of network data flow
40 in the most critical places.
43 typedef u64 psched_time_t;
44 typedef long psched_tdiff_t;
46 /* Avoid doing 64 bit divide by 1000 */
47 #define PSCHED_US2NS(x) ((s64)(x) << 10)
48 #define PSCHED_NS2US(x) ((x) >> 10)
50 #define PSCHED_TICKS_PER_SEC PSCHED_NS2US(NSEC_PER_SEC)
51 #define PSCHED_GET_TIME(stamp) \
52 ((stamp) = PSCHED_NS2US(ktime_to_ns(ktime_get())))
54 #define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2))
55 #define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \
56 min_t(long long, (tv1) - (tv2), bound)
57 #define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2))
58 #define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta))
59 #define PSCHED_TADD(tv, delta) ((tv) += (delta))
60 #define PSCHED_SET_PASTPERFECT(t) ((t) = 0)
61 #define PSCHED_IS_PASTPERFECT(t) ((t) == 0)
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 register_qdisc(struct Qdisc_ops *qops);
77 extern int unregister_qdisc(struct Qdisc_ops *qops);
78 extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
79 extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
80 extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
82 extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
84 extern void __qdisc_run(struct net_device *dev);
86 static inline void qdisc_run(struct net_device *dev)
88 if (!netif_queue_stopped(dev) &&
89 !test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
93 extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
94 struct tcf_result *res);
96 /* Calculate maximal size of packet seen by hard_start_xmit
97 routine of this device.
99 static inline unsigned psched_mtu(struct net_device *dev)
101 unsigned mtu = dev->mtu;
102 return dev->hard_header ? mtu + dev->hard_header_len : mtu;