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	s64			tcfp_pkt_burst;
 14	struct psched_ratecfg	rate;
 15	bool			rate_present;
 16	struct psched_ratecfg	peak;
 17	bool			peak_present;
 18	struct psched_pktrate	ppsrate;
 19	bool			pps_present;
 20	struct rcu_head rcu;
 21};
 22
 23struct tcf_police {
 24	struct tc_action	common;
 25	struct tcf_police_params __rcu *params;
 26
 27	spinlock_t		tcfp_lock ____cacheline_aligned_in_smp;
 28	s64			tcfp_toks;
 29	s64			tcfp_ptoks;
 30	s64			tcfp_pkttoks;
 31	s64			tcfp_t_c;
 32};
 33
 34#define to_police(pc) ((struct tcf_police *)pc)
 35
 36/* old policer structure from before tc actions */
 37struct tc_police_compat {
 38	u32			index;
 39	int			action;
 40	u32			limit;
 41	u32			burst;
 42	u32			mtu;
 43	struct tc_ratespec	rate;
 44	struct tc_ratespec	peakrate;
 45};
 46
 47static inline bool is_tcf_police(const struct tc_action *act)
 48{
 49#ifdef CONFIG_NET_CLS_ACT
 50	if (act->ops && act->ops->id == TCA_ID_POLICE)
 51		return true;
 52#endif
 53	return false;
 54}
 55
 56static inline u64 tcf_police_rate_bytes_ps(const struct tc_action *act)
 57{
 58	struct tcf_police *police = to_police(act);
 59	struct tcf_police_params *params;
 60
 61	params = rcu_dereference_protected(police->params,
 62					   lockdep_is_held(&police->tcf_lock));
 63	return params->rate.rate_bytes_ps;
 64}
 65
 66static inline u32 tcf_police_burst(const struct tc_action *act)
 67{
 68	struct tcf_police *police = to_police(act);
 69	struct tcf_police_params *params;
 70	u32 burst;
 71
 72	params = rcu_dereference_protected(police->params,
 73					   lockdep_is_held(&police->tcf_lock));
 74
 75	/*
 76	 *  "rate" bytes   "burst" nanoseconds
 77	 *  ------------ * -------------------
 78	 *    1 second          2^6 ticks
 79	 *
 80	 * ------------------------------------
 81	 *        NSEC_PER_SEC nanoseconds
 82	 *        ------------------------
 83	 *              2^6 ticks
 84	 *
 85	 *    "rate" bytes   "burst" nanoseconds            2^6 ticks
 86	 *  = ------------ * ------------------- * ------------------------
 87	 *      1 second          2^6 ticks        NSEC_PER_SEC nanoseconds
 88	 *
 89	 *   "rate" * "burst"
 90	 * = ---------------- bytes/nanosecond
 91	 *    NSEC_PER_SEC^2
 92	 *
 93	 *
 94	 *   "rate" * "burst"
 95	 * = ---------------- bytes/second
 96	 *     NSEC_PER_SEC
 97	 */
 98	burst = div_u64(params->tcfp_burst * params->rate.rate_bytes_ps,
 99			NSEC_PER_SEC);
100
101	return burst;
102}
103
104static inline u64 tcf_police_rate_pkt_ps(const struct tc_action *act)
105{
106	struct tcf_police *police = to_police(act);
107	struct tcf_police_params *params;
108
109	params = rcu_dereference_protected(police->params,
110					   lockdep_is_held(&police->tcf_lock));
111	return params->ppsrate.rate_pkts_ps;
112}
113
114static inline u32 tcf_police_burst_pkt(const struct tc_action *act)
115{
116	struct tcf_police *police = to_police(act);
117	struct tcf_police_params *params;
118	u32 burst;
119
120	params = rcu_dereference_protected(police->params,
121					   lockdep_is_held(&police->tcf_lock));
122
123	/*
124	 *  "rate" pkts     "burst" nanoseconds
125	 *  ------------ *  -------------------
126	 *    1 second          2^6 ticks
127	 *
128	 * ------------------------------------
129	 *        NSEC_PER_SEC nanoseconds
130	 *        ------------------------
131	 *              2^6 ticks
132	 *
133	 *    "rate" pkts    "burst" nanoseconds            2^6 ticks
134	 *  = ------------ * ------------------- * ------------------------
135	 *      1 second          2^6 ticks        NSEC_PER_SEC nanoseconds
136	 *
137	 *   "rate" * "burst"
138	 * = ---------------- pkts/nanosecond
139	 *    NSEC_PER_SEC^2
140	 *
141	 *
142	 *   "rate" * "burst"
143	 * = ---------------- pkts/second
144	 *     NSEC_PER_SEC
145	 */
146	burst = div_u64(params->tcfp_pkt_burst * params->ppsrate.rate_pkts_ps,
147			NSEC_PER_SEC);
148
149	return burst;
150}
151
152static inline u32 tcf_police_tcfp_mtu(const struct tc_action *act)
153{
154	struct tcf_police *police = to_police(act);
155	struct tcf_police_params *params;
156
157	params = rcu_dereference_protected(police->params,
158					   lockdep_is_held(&police->tcf_lock));
159	return params->tcfp_mtu;
160}
161
162static inline u64 tcf_police_peakrate_bytes_ps(const struct tc_action *act)
163{
164	struct tcf_police *police = to_police(act);
165	struct tcf_police_params *params;
166
167	params = rcu_dereference_protected(police->params,
168					   lockdep_is_held(&police->tcf_lock));
169	return params->peak.rate_bytes_ps;
170}
171
172static inline u32 tcf_police_tcfp_ewma_rate(const struct tc_action *act)
173{
174	struct tcf_police *police = to_police(act);
175	struct tcf_police_params *params;
176
177	params = rcu_dereference_protected(police->params,
178					   lockdep_is_held(&police->tcf_lock));
179	return params->tcfp_ewma_rate;
180}
181
182static inline u16 tcf_police_rate_overhead(const struct tc_action *act)
183{
184	struct tcf_police *police = to_police(act);
185	struct tcf_police_params *params;
186
187	params = rcu_dereference_protected(police->params,
188					   lockdep_is_held(&police->tcf_lock));
189	return params->rate.overhead;
190}
191
192#endif /* __NET_TC_POLICE_H */