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 <linux/if_vlan.h>
7#include <net/sch_generic.h>
8
9#define DEFAULT_TX_QUEUE_LEN 1000
10
11struct qdisc_walker {
12 int stop;
13 int skip;
14 int count;
15 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
16};
17
18#define QDISC_ALIGNTO 64
19#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
20
21static inline void *qdisc_priv(struct Qdisc *q)
22{
23 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
24}
25
26/*
27 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
28
29 Normal IP packet size ~ 512byte, hence:
30
31 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
32 10Mbit ethernet.
33
34 10msec resolution -> <50Kbit/sec.
35
36 The result: [34]86 is not good choice for QoS router :-(
37
38 The things are not so bad, because we may use artificial
39 clock evaluated by integration of network data flow
40 in the most critical places.
41 */
42
43typedef u64 psched_time_t;
44typedef long psched_tdiff_t;
45
46/* Avoid doing 64 bit divide */
47#define PSCHED_SHIFT 6
48#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
49#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
50
51#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
52#define PSCHED_PASTPERFECT 0
53
54static inline psched_time_t psched_get_time(void)
55{
56 return PSCHED_NS2TICKS(ktime_get_ns());
57}
58
59static inline psched_tdiff_t
60psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
61{
62 return min(tv1 - tv2, bound);
63}
64
65struct qdisc_watchdog {
66 u64 last_expires;
67 struct hrtimer timer;
68 struct Qdisc *qdisc;
69};
70
71void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
72void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
73
74static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
75 psched_time_t expires)
76{
77 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
78}
79
80void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
81
82extern struct Qdisc_ops pfifo_qdisc_ops;
83extern struct Qdisc_ops bfifo_qdisc_ops;
84extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
85
86int fifo_set_limit(struct Qdisc *q, unsigned int limit);
87struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
88 unsigned int limit);
89
90int register_qdisc(struct Qdisc_ops *qops);
91int unregister_qdisc(struct Qdisc_ops *qops);
92void qdisc_get_default(char *id, size_t len);
93int qdisc_set_default(const char *id);
94
95void qdisc_hash_add(struct Qdisc *q, bool invisible);
96void qdisc_hash_del(struct Qdisc *q);
97struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
98struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
99struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
100 struct nlattr *tab);
101void qdisc_put_rtab(struct qdisc_rate_table *tab);
102void qdisc_put_stab(struct qdisc_size_table *tab);
103void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
104int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
105 struct net_device *dev, struct netdev_queue *txq,
106 spinlock_t *root_lock, bool validate);
107
108void __qdisc_run(struct Qdisc *q);
109
110static inline void qdisc_run(struct Qdisc *q)
111{
112 if (qdisc_run_begin(q))
113 __qdisc_run(q);
114}
115
116static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
117{
118 /* We need to take extra care in case the skb came via
119 * vlan accelerated path. In that case, use skb->vlan_proto
120 * as the original vlan header was already stripped.
121 */
122 if (skb_vlan_tag_present(skb))
123 return skb->vlan_proto;
124 return skb->protocol;
125}
126
127/* Calculate maximal size of packet seen by hard_start_xmit
128 routine of this device.
129 */
130static inline unsigned int psched_mtu(const struct net_device *dev)
131{
132 return dev->mtu + dev->hard_header_len;
133}
134
135#endif