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 */