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