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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 action;
9 int tcfp_result;
10 u32 tcfp_ewma_rate;
11 u32 tcfp_mtu;
12 s64 tcfp_burst;
13 s64 tcfp_mtu_ptoks;
14 s64 tcfp_pkt_burst;
15 struct psched_ratecfg rate;
16 bool rate_present;
17 struct psched_ratecfg peak;
18 bool peak_present;
19 struct psched_pktrate ppsrate;
20 bool pps_present;
21 struct rcu_head rcu;
22};
23
24struct tcf_police {
25 struct tc_action common;
26 struct tcf_police_params __rcu *params;
27
28 spinlock_t tcfp_lock ____cacheline_aligned_in_smp;
29 s64 tcfp_toks;
30 s64 tcfp_ptoks;
31 s64 tcfp_pkttoks;
32 s64 tcfp_t_c;
33};
34
35#define to_police(pc) ((struct tcf_police *)pc)
36
37/* old policer structure from before tc actions */
38struct tc_police_compat {
39 u32 index;
40 int action;
41 u32 limit;
42 u32 burst;
43 u32 mtu;
44 struct tc_ratespec rate;
45 struct tc_ratespec peakrate;
46};
47
48static inline u64 tcf_police_rate_bytes_ps(const struct tc_action *act)
49{
50 struct tcf_police *police = to_police(act);
51 struct tcf_police_params *params;
52
53 params = rcu_dereference_protected(police->params,
54 lockdep_is_held(&police->tcf_lock));
55 return params->rate.rate_bytes_ps;
56}
57
58static inline u32 tcf_police_burst(const struct tc_action *act)
59{
60 struct tcf_police *police = to_police(act);
61 struct tcf_police_params *params;
62 u32 burst;
63
64 params = rcu_dereference_protected(police->params,
65 lockdep_is_held(&police->tcf_lock));
66
67 /*
68 * "rate" bytes "burst" nanoseconds
69 * ------------ * -------------------
70 * 1 second 2^6 ticks
71 *
72 * ------------------------------------
73 * NSEC_PER_SEC nanoseconds
74 * ------------------------
75 * 2^6 ticks
76 *
77 * "rate" bytes "burst" nanoseconds 2^6 ticks
78 * = ------------ * ------------------- * ------------------------
79 * 1 second 2^6 ticks NSEC_PER_SEC nanoseconds
80 *
81 * "rate" * "burst"
82 * = ---------------- bytes/nanosecond
83 * NSEC_PER_SEC^2
84 *
85 *
86 * "rate" * "burst"
87 * = ---------------- bytes/second
88 * NSEC_PER_SEC
89 */
90 burst = div_u64(params->tcfp_burst * params->rate.rate_bytes_ps,
91 NSEC_PER_SEC);
92
93 return burst;
94}
95
96static inline u64 tcf_police_rate_pkt_ps(const struct tc_action *act)
97{
98 struct tcf_police *police = to_police(act);
99 struct tcf_police_params *params;
100
101 params = rcu_dereference_protected(police->params,
102 lockdep_is_held(&police->tcf_lock));
103 return params->ppsrate.rate_pkts_ps;
104}
105
106static inline u32 tcf_police_burst_pkt(const struct tc_action *act)
107{
108 struct tcf_police *police = to_police(act);
109 struct tcf_police_params *params;
110 u32 burst;
111
112 params = rcu_dereference_protected(police->params,
113 lockdep_is_held(&police->tcf_lock));
114
115 /*
116 * "rate" pkts "burst" nanoseconds
117 * ------------ * -------------------
118 * 1 second 2^6 ticks
119 *
120 * ------------------------------------
121 * NSEC_PER_SEC nanoseconds
122 * ------------------------
123 * 2^6 ticks
124 *
125 * "rate" pkts "burst" nanoseconds 2^6 ticks
126 * = ------------ * ------------------- * ------------------------
127 * 1 second 2^6 ticks NSEC_PER_SEC nanoseconds
128 *
129 * "rate" * "burst"
130 * = ---------------- pkts/nanosecond
131 * NSEC_PER_SEC^2
132 *
133 *
134 * "rate" * "burst"
135 * = ---------------- pkts/second
136 * NSEC_PER_SEC
137 */
138 burst = div_u64(params->tcfp_pkt_burst * params->ppsrate.rate_pkts_ps,
139 NSEC_PER_SEC);
140
141 return burst;
142}
143
144static inline u32 tcf_police_tcfp_mtu(const struct tc_action *act)
145{
146 struct tcf_police *police = to_police(act);
147 struct tcf_police_params *params;
148
149 params = rcu_dereference_protected(police->params,
150 lockdep_is_held(&police->tcf_lock));
151 return params->tcfp_mtu;
152}
153
154static inline u64 tcf_police_peakrate_bytes_ps(const struct tc_action *act)
155{
156 struct tcf_police *police = to_police(act);
157 struct tcf_police_params *params;
158
159 params = rcu_dereference_protected(police->params,
160 lockdep_is_held(&police->tcf_lock));
161 return params->peak.rate_bytes_ps;
162}
163
164static inline u32 tcf_police_tcfp_ewma_rate(const struct tc_action *act)
165{
166 struct tcf_police *police = to_police(act);
167 struct tcf_police_params *params;
168
169 params = rcu_dereference_protected(police->params,
170 lockdep_is_held(&police->tcf_lock));
171 return params->tcfp_ewma_rate;
172}
173
174static inline u16 tcf_police_rate_overhead(const struct tc_action *act)
175{
176 struct tcf_police *police = to_police(act);
177 struct tcf_police_params *params;
178
179 params = rcu_dereference_protected(police->params,
180 lockdep_is_held(&police->tcf_lock));
181 return params->rate.overhead;
182}
183
184#endif /* __NET_TC_POLICE_H */
185

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source code of linux/include/net/tc_act/tc_police.h