net-sched: consolidate default fifo qdisc setup
[linux-2.6/mini2440.git] / include / net / pkt_sched.h
blob8e3a0c4e9d97375215f68719b7df1d6e30c6b053
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>
8 struct qdisc_walker
10 int stop;
11 int skip;
12 int count;
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));
24 /*
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
30 10Mbit ethernet.
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 by 1000 */
45 #define PSCHED_US2NS(x) ((s64)(x) << 10)
46 #define PSCHED_NS2US(x) ((x) >> 10)
48 #define PSCHED_TICKS_PER_SEC PSCHED_NS2US(NSEC_PER_SEC)
49 #define PSCHED_PASTPERFECT 0
51 static inline psched_time_t psched_get_time(void)
53 return PSCHED_NS2US(ktime_to_ns(ktime_get()));
56 static inline psched_tdiff_t
57 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
59 return min(tv1 - tv2, bound);
62 struct qdisc_watchdog {
63 struct hrtimer timer;
64 struct Qdisc *qdisc;
67 extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
68 extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
69 psched_time_t expires);
70 extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
72 extern struct Qdisc_ops pfifo_qdisc_ops;
73 extern struct Qdisc_ops bfifo_qdisc_ops;
75 extern int fifo_set_limit(struct Qdisc *q, unsigned int limit);
76 extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
77 unsigned int limit);
79 extern int register_qdisc(struct Qdisc_ops *qops);
80 extern int unregister_qdisc(struct Qdisc_ops *qops);
81 extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
82 extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
83 extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
84 struct nlattr *tab);
85 extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
87 extern void __qdisc_run(struct net_device *dev);
89 static inline void qdisc_run(struct net_device *dev)
91 if (!netif_queue_stopped(dev) &&
92 !test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
93 __qdisc_run(dev);
96 extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp,
97 struct tcf_result *res);
98 extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
99 struct tcf_result *res);
101 /* Calculate maximal size of packet seen by hard_start_xmit
102 routine of this device.
104 static inline unsigned psched_mtu(const struct net_device *dev)
106 return dev->mtu + dev->hard_header_len;
109 #endif