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192.168.1.100 / T103 / 1f884588077ad3476b9c91cbb0ee9ee0332bbb68 / . / src / kernel / linux / v4.14 / include / net / pkt_sched.h
blob: bd29039066a48defc7341f1a1b78e06caac92496 [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_PKT_SCHED_H
3#define __NET_PKT_SCHED_H
4
5#include <linux/jiffies.h>
6#include <linux/ktime.h>
7#include <linux/if_vlan.h>
8#include <net/sch_generic.h>
9#include <uapi/linux/pkt_sched.h>
10
11#define DEFAULT_TX_QUEUE_LEN 1000
12
13struct qdisc_walker {
14 int stop;
15 int skip;
16 int count;
17 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
18};
19
20#define QDISC_ALIGNTO 64
21#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
22
23static inline void *qdisc_priv(struct Qdisc *q)
24{
25 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
26}
27
28/*
29 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
30
31 Normal IP packet size ~ 512byte, hence:
32
33 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
34 10Mbit ethernet.
35
36 10msec resolution -> <50Kbit/sec.
37
38 The result: [34]86 is not good choice for QoS router :-(
39
40 The things are not so bad, because we may use artificial
41 clock evaluated by integration of network data flow
42 in the most critical places.
43 */
44
45typedef u64 psched_time_t;
46typedef long psched_tdiff_t;
47
48/* Avoid doing 64 bit divide */
49#define PSCHED_SHIFT 6
50#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
51#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
52
53#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
54#define PSCHED_PASTPERFECT 0
55
56static inline psched_time_t psched_get_time(void)
57{
58 return PSCHED_NS2TICKS(ktime_get_ns());
59}
60
61static inline psched_tdiff_t
62psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
63{
64 return min(tv1 - tv2, bound);
65}
66
67struct qdisc_watchdog {
68 u64 last_expires;
69 struct hrtimer timer;
70 struct Qdisc *qdisc;
71};
72
73void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
74void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
75
76static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
77 psched_time_t expires)
78{
79 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
80}
81
82void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
83
84extern struct Qdisc_ops pfifo_qdisc_ops;
85extern struct Qdisc_ops bfifo_qdisc_ops;
86extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
87
88int fifo_set_limit(struct Qdisc *q, unsigned int limit);
89struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
90 unsigned int limit);
91
92int register_qdisc(struct Qdisc_ops *qops);
93int unregister_qdisc(struct Qdisc_ops *qops);
94void qdisc_get_default(char *id, size_t len);
95int qdisc_set_default(const char *id);
96
97void qdisc_hash_add(struct Qdisc *q, bool invisible);
98void qdisc_hash_del(struct Qdisc *q);
99struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
100struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
101struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
102 struct nlattr *tab);
103void qdisc_put_rtab(struct qdisc_rate_table *tab);
104void qdisc_put_stab(struct qdisc_size_table *tab);
105void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
106int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
107 struct net_device *dev, struct netdev_queue *txq,
108 spinlock_t *root_lock, bool validate);
109
110void __qdisc_run(struct Qdisc *q);
111
112static inline void qdisc_run(struct Qdisc *q)
113{
114 if (qdisc_run_begin(q))
115 __qdisc_run(q);
116}
117
118static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
119{
120 /* We need to take extra care in case the skb came via
121 * vlan accelerated path. In that case, use skb->vlan_proto
122 * as the original vlan header was already stripped.
123 */
124 if (skb_vlan_tag_present(skb))
125 return skb->vlan_proto;
126 return skb->protocol;
127}
128
129/* Calculate maximal size of packet seen by hard_start_xmit
130 routine of this device.
131 */
132static inline unsigned int psched_mtu(const struct net_device *dev)
133{
134 return dev->mtu + dev->hard_header_len;
135}
136
137static inline bool is_classid_clsact_ingress(u32 classid)
138{
139 /* This also returns true for ingress qdisc */
140 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) &&
141 TC_H_MIN(classid) != TC_H_MIN(TC_H_MIN_EGRESS);
142}
143
144static inline bool is_classid_clsact_egress(u32 classid)
145{
146 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) &&
147 TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_EGRESS);
148}
149
150struct tc_cbs_qopt_offload {
151 u8 enable;
152 s32 queue;
153 s32 hicredit;
154 s32 locredit;
155 s32 idleslope;
156 s32 sendslope;
157};
158
159#endif