tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __NET_PKT_SCHED_H
2#define __NET_PKT_SCHED_H
3
4#include <linux/jiffies.h>
5#include <linux/ktime.h>
6#include <net/sch_generic.h>
7
8struct qdisc_walker
9{
10 int stop;
11 int skip;
12 int count;
13 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
14};
15
16#define QDISC_ALIGNTO 32
17#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
18
19static inline void *qdisc_priv(struct Qdisc *q)
20{
21 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
22}
23
24/*
25 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
26
27 Normal IP packet size ~ 512byte, hence:
28
29 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
30 10Mbit ethernet.
31
32 10msec resolution -> <50Kbit/sec.
33
34 The result: [34]86 is not good choice for QoS router :-(
35
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.
39 */
40
41typedef u64 psched_time_t;
42typedef long psched_tdiff_t;
43
44/* Avoid doing 64 bit divide by 1000 */
45#define PSCHED_US2NS(x) ((s64)(x) << 10)
46#define PSCHED_NS2US(x) ((x) >> 10)
47
48#define PSCHED_TICKS_PER_SEC PSCHED_NS2US(NSEC_PER_SEC)
49#define PSCHED_PASTPERFECT 0
50
51static inline psched_time_t psched_get_time(void)
52{
53 return PSCHED_NS2US(ktime_to_ns(ktime_get()));
54}
55
56static inline psched_tdiff_t
57psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
58{
59 return min(tv1 - tv2, bound);
60}
61
62struct qdisc_watchdog {
63 struct hrtimer timer;
64 struct Qdisc *qdisc;
65};
66
67extern void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
68extern void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
69 psched_time_t expires);
70extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
71
72extern struct Qdisc_ops pfifo_qdisc_ops;
73extern struct Qdisc_ops bfifo_qdisc_ops;
74
75extern int register_qdisc(struct Qdisc_ops *qops);
76extern int unregister_qdisc(struct Qdisc_ops *qops);
77extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
78extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
79extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
80 struct nlattr *tab);
81extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
82
83extern void __qdisc_run(struct net_device *dev);
84
85static inline void qdisc_run(struct net_device *dev)
86{
87 if (!netif_queue_stopped(dev) &&
88 !test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
89 __qdisc_run(dev);
90}
91
92extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp,
93 struct tcf_result *res);
94extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
95 struct tcf_result *res);
96
97/* Calculate maximal size of packet seen by hard_start_xmit
98 routine of this device.
99 */
100static inline unsigned psched_mtu(const struct net_device *dev)
101{
102 return dev->mtu + dev->hard_header_len;
103}
104
105#endif