1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_TC_POLICE_H
3#define __NET_TC_POLICE_H
4
5#include <net/act_api.h>
6
7struct tcf_police_params {
8	int			tcfp_result;
9	u32			tcfp_ewma_rate;
10	s64			tcfp_burst;
11	u32			tcfp_mtu;
12	s64			tcfp_mtu_ptoks;
13	struct psched_ratecfg	rate;
14	bool			rate_present;
15	struct psched_ratecfg	peak;
16	bool			peak_present;
17	struct rcu_head rcu;
18};
19
20struct tcf_police {
21	struct tc_action	common;
22	struct tcf_police_params __rcu *params;
23
24	spinlock_t		tcfp_lock ____cacheline_aligned_in_smp;
25	s64			tcfp_toks;
26	s64			tcfp_ptoks;
27	s64			tcfp_t_c;
28};
29
30#define to_police(pc) ((struct tcf_police *)pc)
31
32/* old policer structure from before tc actions */
33struct tc_police_compat {
34	u32			index;
35	int			action;
36	u32			limit;
37	u32			burst;
38	u32			mtu;
39	struct tc_ratespec	rate;
40	struct tc_ratespec	peakrate;
41};
42
43static inline bool is_tcf_police(const struct tc_action *act)
44{
45#ifdef CONFIG_NET_CLS_ACT
46	if (act->ops && act->ops->id == TCA_ID_POLICE)
47		return true;
48#endif
49	return false;
50}
51
52static inline u64 tcf_police_rate_bytes_ps(const struct tc_action *act)
53{
54	struct tcf_police *police = to_police(act);
55	struct tcf_police_params *params;
56
57	params = rcu_dereference_protected(police->params,
58					   lockdep_is_held(&police->tcf_lock));
59	return params->rate.rate_bytes_ps;
60}
61
62static inline u32 tcf_police_burst(const struct tc_action *act)
63{
64	struct tcf_police *police = to_police(act);
65	struct tcf_police_params *params;
66	u32 burst;
67
68	params = rcu_dereference_protected(police->params,
69					   lockdep_is_held(&police->tcf_lock));
70
71	/*
72	 *  "rate" bytes   "burst" nanoseconds
73	 *  ------------ * -------------------
74	 *    1 second          2^6 ticks
75	 *
76	 * ------------------------------------
77	 *        NSEC_PER_SEC nanoseconds
78	 *        ------------------------
79	 *              2^6 ticks
80	 *
81	 *    "rate" bytes   "burst" nanoseconds            2^6 ticks
82	 *  = ------------ * ------------------- * ------------------------
83	 *      1 second          2^6 ticks        NSEC_PER_SEC nanoseconds
84	 *
85	 *   "rate" * "burst"
86	 * = ---------------- bytes/nanosecond
87	 *    NSEC_PER_SEC^2
88	 *
89	 *
90	 *   "rate" * "burst"
91	 * = ---------------- bytes/second
92	 *     NSEC_PER_SEC
93	 */
94	burst = div_u64(params->tcfp_burst * params->rate.rate_bytes_ps,
95			NSEC_PER_SEC);
96
97	return burst;
98}
99
100static inline u32 tcf_police_tcfp_mtu(const struct tc_action *act)
101{
102	struct tcf_police *police = to_police(act);
103	struct tcf_police_params *params;
104
105	params = rcu_dereference_protected(police->params,
106					   lockdep_is_held(&police->tcf_lock));
107	return params->tcfp_mtu;
108}
109
110#endif /* __NET_TC_POLICE_H */
111