Merge tag 'doc-4.8-fixes' of git://git.lwn.net/linux
[deliverable/linux.git] / include / net / pkt_sched.h
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1da177e4
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1#ifndef __NET_PKT_SCHED_H
2#define __NET_PKT_SCHED_H
3
538e43a4 4#include <linux/jiffies.h>
641b9e0e 5#include <linux/ktime.h>
d8b9605d 6#include <linux/if_vlan.h>
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7#include <net/sch_generic.h>
8
fd2c3ef7 9struct qdisc_walker {
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10 int stop;
11 int skip;
12 int count;
13 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
14};
15
5d944c64 16#define QDISC_ALIGNTO 64
3d54b82f 17#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
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18
19static inline void *qdisc_priv(struct Qdisc *q)
20{
3d54b82f 21 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
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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
25985edc 36 The things are not so bad, because we may use artificial
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37 clock evaluated by integration of network data flow
38 in the most critical places.
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39 */
40
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41typedef u64 psched_time_t;
42typedef long psched_tdiff_t;
43
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44/* Avoid doing 64 bit divide */
45#define PSCHED_SHIFT 6
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46#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
47#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
1da177e4 48
ca44d6e6 49#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
a084980d 50#define PSCHED_PASTPERFECT 0
1da177e4 51
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52static inline psched_time_t psched_get_time(void)
53{
d2de875c 54 return PSCHED_NS2TICKS(ktime_get_ns());
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55}
56
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57static inline psched_tdiff_t
58psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
59{
60 return min(tv1 - tv2, bound);
61}
62
4179477f 63struct qdisc_watchdog {
a9efad8b 64 u64 last_expires;
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65 struct hrtimer timer;
66 struct Qdisc *qdisc;
67};
68
5c15257f 69void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
45f50bed 70void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
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71
72static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
73 psched_time_t expires)
74{
45f50bed 75 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
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76}
77
5c15257f 78void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
4179477f 79
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80extern struct Qdisc_ops pfifo_qdisc_ops;
81extern struct Qdisc_ops bfifo_qdisc_ops;
57dbb2d8 82extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
1da177e4 83
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84int fifo_set_limit(struct Qdisc *q, unsigned int limit);
85struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
86 unsigned int limit);
87
88int register_qdisc(struct Qdisc_ops *qops);
89int unregister_qdisc(struct Qdisc_ops *qops);
6da7c8fc 90void qdisc_get_default(char *id, size_t len);
91int qdisc_set_default(const char *id);
92
95dc1929 93void qdisc_list_add(struct Qdisc *q);
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94void qdisc_list_del(struct Qdisc *q);
95struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
96struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
97struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
98 struct nlattr *tab);
99void qdisc_put_rtab(struct qdisc_rate_table *tab);
100void qdisc_put_stab(struct qdisc_size_table *tab);
6e765a00 101void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
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102int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
103 struct net_device *dev, struct netdev_queue *txq,
55a93b3e 104 spinlock_t *root_lock, bool validate);
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105
106void __qdisc_run(struct Qdisc *q);
1da177e4 107
37437bb2 108static inline void qdisc_run(struct Qdisc *q)
1da177e4 109{
bc135b23 110 if (qdisc_run_begin(q))
37437bb2 111 __qdisc_run(q);
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112}
113
5c15257f 114int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
3b3ae880 115 struct tcf_result *res, bool compat_mode);
1da177e4 116
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117static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
118{
119 /* We need to take extra care in case the skb came via
120 * vlan accelerated path. In that case, use skb->vlan_proto
121 * as the original vlan header was already stripped.
122 */
df8a39de 123 if (skb_vlan_tag_present(skb))
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124 return skb->vlan_proto;
125 return skb->protocol;
126}
127
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128/* Calculate maximal size of packet seen by hard_start_xmit
129 routine of this device.
130 */
95c96174 131static inline unsigned int psched_mtu(const struct net_device *dev)
1da177e4 132{
3b04ddde 133 return dev->mtu + dev->hard_header_len;
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134}
135
136#endif
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