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
22static inline void *qdisc_priv(struct Qdisc *q)
23{
24 return &q->privdata;
25}
26
27static inline struct Qdisc *qdisc_from_priv(void *priv)
28{
29 return container_of(priv, struct Qdisc, privdata);
30}
31
32/*
33 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
34
35 Normal IP packet size ~ 512byte, hence:
36
37 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
38 10Mbit ethernet.
39
40 10msec resolution -> <50Kbit/sec.
41
42 The result: [34]86 is not good choice for QoS router :-(
43
44 The things are not so bad, because we may use artificial
45 clock evaluated by integration of network data flow
46 in the most critical places.
47 */
48
49typedef u64 psched_time_t;
50typedef long psched_tdiff_t;
51
52/* Avoid doing 64 bit divide */
53#define PSCHED_SHIFT 6
54#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
55#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
56
57#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
58#define PSCHED_PASTPERFECT 0
59
60static inline psched_time_t psched_get_time(void)
61{
62 return PSCHED_NS2TICKS(ktime_get_ns());
63}
64
65static inline psched_tdiff_t
66psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
67{
68 return min(tv1 - tv2, bound);
69}
70
71struct qdisc_watchdog {
72 u64 last_expires;
73 struct hrtimer timer;
74 struct Qdisc *qdisc;
75};
76
77void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
78 clockid_t clockid);
79void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
80
81void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
82 u64 delta_ns);
83
84static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
85 u64 expires)
86{
87 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
88}
89
90static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
91 psched_time_t expires)
92{
93 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
94}
95
96void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
97
98extern struct Qdisc_ops pfifo_qdisc_ops;
99extern struct Qdisc_ops bfifo_qdisc_ops;
100extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
101
102int fifo_set_limit(struct Qdisc *q, unsigned int limit);
103struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
104 unsigned int limit,
105 struct netlink_ext_ack *extack);
106
107int register_qdisc(struct Qdisc_ops *qops);
108int unregister_qdisc(struct Qdisc_ops *qops);
109void qdisc_get_default(char *id, size_t len);
110int qdisc_set_default(const char *id);
111
112void qdisc_hash_add(struct Qdisc *q, bool invisible);
113void qdisc_hash_del(struct Qdisc *q);
114struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
115struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
116struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
117 struct nlattr *tab,
118 struct netlink_ext_ack *extack);
119void qdisc_put_rtab(struct qdisc_rate_table *tab);
120void qdisc_put_stab(struct qdisc_size_table *tab);
121void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
122bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
123 struct net_device *dev, struct netdev_queue *txq,
124 spinlock_t *root_lock, bool validate);
125
126void __qdisc_run(struct Qdisc *q);
127
128static inline void qdisc_run(struct Qdisc *q)
129{
130 if (qdisc_run_begin(q)) {
131 __qdisc_run(q);
132 qdisc_run_end(q);
133 }
134}
135
136/* Calculate maximal size of packet seen by hard_start_xmit
137 routine of this device.
138 */
139static inline unsigned int psched_mtu(const struct net_device *dev)
140{
141 return dev->mtu + dev->hard_header_len;
142}
143
144static inline struct net *qdisc_net(struct Qdisc *q)
145{
146 return dev_net(q->dev_queue->dev);
147}
148
149struct tc_cbs_qopt_offload {
150 u8 enable;
151 s32 queue;
152 s32 hicredit;
153 s32 locredit;
154 s32 idleslope;
155 s32 sendslope;
156};
157
158struct tc_etf_qopt_offload {
159 u8 enable;
160 s32 queue;
161};
162
163struct tc_taprio_sched_entry {
164 u8 command; /* TC_TAPRIO_CMD_* */
165
166 /* The gate_mask in the offloading side refers to traffic classes */
167 u32 gate_mask;
168 u32 interval;
169};
170
171struct tc_taprio_qopt_offload {
172 u8 enable;
173 ktime_t base_time;
174 u64 cycle_time;
175 u64 cycle_time_extension;
176
177 size_t num_entries;
178 struct tc_taprio_sched_entry entries[];
179};
180
181/* Reference counting */
182struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
183 *offload);
184void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
185
186/* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
187 * not mistaken for a software timestamp, because this will otherwise prevent
188 * the dispatch of hardware timestamps to the socket.
189 */
190static inline void skb_txtime_consumed(struct sk_buff *skb)
191{
192 skb->tstamp = ktime_set(0, 0);
193}
194
195#endif