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#define STAB_SIZE_LOG_MAX 30
15
16struct qdisc_walker {
17 int stop;
18 int skip;
19 int count;
20 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
21};
22
23static inline void *qdisc_priv(struct Qdisc *q)
24{
25 return &q->privdata;
26}
27
28static inline struct Qdisc *qdisc_from_priv(void *priv)
29{
30 return container_of(priv, struct Qdisc, privdata);
31}
32
33/*
34 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
35
36 Normal IP packet size ~ 512byte, hence:
37
38 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
39 10Mbit ethernet.
40
41 10msec resolution -> <50Kbit/sec.
42
43 The result: [34]86 is not good choice for QoS router :-(
44
45 The things are not so bad, because we may use artificial
46 clock evaluated by integration of network data flow
47 in the most critical places.
48 */
49
50typedef u64 psched_time_t;
51typedef long psched_tdiff_t;
52
53/* Avoid doing 64 bit divide */
54#define PSCHED_SHIFT 6
55#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
56#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
57
58#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
59#define PSCHED_PASTPERFECT 0
60
61static inline psched_time_t psched_get_time(void)
62{
63 return PSCHED_NS2TICKS(ktime_get_ns());
64}
65
66struct qdisc_watchdog {
67 struct hrtimer timer;
68 struct Qdisc *qdisc;
69};
70
71void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
72 clockid_t clockid);
73void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
74
75void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
76 u64 delta_ns);
77
78static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
79 u64 expires)
80{
81 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
82}
83
84static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
85 psched_time_t expires)
86{
87 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
88}
89
90void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
91
92extern struct Qdisc_ops pfifo_qdisc_ops;
93extern struct Qdisc_ops bfifo_qdisc_ops;
94extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
95
96int fifo_set_limit(struct Qdisc *q, unsigned int limit);
97struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
98 unsigned int limit,
99 struct netlink_ext_ack *extack);
100
101int register_qdisc(struct Qdisc_ops *qops);
102void unregister_qdisc(struct Qdisc_ops *qops);
103void qdisc_get_default(char *id, size_t len);
104int qdisc_set_default(const char *id);
105
106void qdisc_hash_add(struct Qdisc *q, bool invisible);
107void qdisc_hash_del(struct Qdisc *q);
108struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
109struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
110struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
111 struct nlattr *tab,
112 struct netlink_ext_ack *extack);
113void qdisc_put_rtab(struct qdisc_rate_table *tab);
114void qdisc_put_stab(struct qdisc_size_table *tab);
115void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
116bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
117 struct net_device *dev, struct netdev_queue *txq,
118 spinlock_t *root_lock, bool validate);
119
120void __qdisc_run(struct Qdisc *q);
121
122static inline void qdisc_run(struct Qdisc *q)
123{
124 if (qdisc_run_begin(q)) {
125 __qdisc_run(q);
126 qdisc_run_end(q);
127 }
128}
129
130/* Calculate maximal size of packet seen by hard_start_xmit
131 routine of this device.
132 */
133static inline unsigned int psched_mtu(const struct net_device *dev)
134{
135 return dev->mtu + dev->hard_header_len;
136}
137
138static inline struct net *qdisc_net(struct Qdisc *q)
139{
140 return dev_net(q->dev_queue->dev);
141}
142
143struct tc_query_caps_base {
144 enum tc_setup_type type;
145 void *caps;
146};
147
148struct tc_cbs_qopt_offload {
149 u8 enable;
150 s32 queue;
151 s32 hicredit;
152 s32 locredit;
153 s32 idleslope;
154 s32 sendslope;
155};
156
157struct tc_etf_qopt_offload {
158 u8 enable;
159 s32 queue;
160};
161
162struct tc_mqprio_caps {
163 bool validate_queue_counts:1;
164};
165
166struct tc_mqprio_qopt_offload {
167 /* struct tc_mqprio_qopt must always be the first element */
168 struct tc_mqprio_qopt qopt;
169 struct netlink_ext_ack *extack;
170 u16 mode;
171 u16 shaper;
172 u32 flags;
173 u64 min_rate[TC_QOPT_MAX_QUEUE];
174 u64 max_rate[TC_QOPT_MAX_QUEUE];
175 unsigned long preemptible_tcs;
176};
177
178struct tc_taprio_caps {
179 bool supports_queue_max_sdu:1;
180 bool gate_mask_per_txq:1;
181 /* Device expects lower TXQ numbers to have higher priority over higher
182 * TXQs, regardless of their TC mapping. DO NOT USE FOR NEW DRIVERS,
183 * INSTEAD ENFORCE A PROPER TC:TXQ MAPPING COMING FROM USER SPACE.
184 */
185 bool broken_mqprio:1;
186};
187
188struct tc_taprio_sched_entry {
189 u8 command; /* TC_TAPRIO_CMD_* */
190
191 /* The gate_mask in the offloading side refers to traffic classes */
192 u32 gate_mask;
193 u32 interval;
194};
195
196struct tc_taprio_qopt_offload {
197 struct tc_mqprio_qopt_offload mqprio;
198 struct netlink_ext_ack *extack;
199 u8 enable;
200 ktime_t base_time;
201 u64 cycle_time;
202 u64 cycle_time_extension;
203 u32 max_sdu[TC_MAX_QUEUE];
204
205 size_t num_entries;
206 struct tc_taprio_sched_entry entries[];
207};
208
209#if IS_ENABLED(CONFIG_NET_SCH_TAPRIO)
210
211/* Reference counting */
212struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
213 *offload);
214void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
215
216#else
217
218/* Reference counting */
219static inline struct tc_taprio_qopt_offload *
220taprio_offload_get(struct tc_taprio_qopt_offload *offload)
221{
222 return NULL;
223}
224
225static inline void taprio_offload_free(struct tc_taprio_qopt_offload *offload)
226{
227}
228
229#endif
230
231/* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
232 * not mistaken for a software timestamp, because this will otherwise prevent
233 * the dispatch of hardware timestamps to the socket.
234 */
235static inline void skb_txtime_consumed(struct sk_buff *skb)
236{
237 skb->tstamp = ktime_set(0, 0);
238}
239
240struct tc_skb_cb {
241 struct qdisc_skb_cb qdisc_cb;
242
243 u16 mru;
244 u8 post_ct:1;
245 u8 post_ct_snat:1;
246 u8 post_ct_dnat:1;
247 u16 zone; /* Only valid if post_ct = true */
248};
249
250static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
251{
252 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
253
254 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
255 return cb;
256}
257
258static inline bool tc_qdisc_stats_dump(struct Qdisc *sch,
259 unsigned long cl,
260 struct qdisc_walker *arg)
261{
262 if (arg->count >= arg->skip && arg->fn(sch, cl, arg) < 0) {
263 arg->stop = 1;
264 return false;
265 }
266
267 arg->count++;
268 return true;
269}
270
271#endif