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 
7 struct 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 
20 struct 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 */
33 struct 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 
is_tcf_police(const struct tc_action * act)43 static 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 
tcf_police_rate_bytes_ps(const struct tc_action * act)52 static 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 
tcf_police_burst(const struct tc_action * act)62 static 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 
tcf_police_tcfp_mtu(const struct tc_action * act)100 static 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