Quelle  tc_police.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_TC_POLICE_H
#define __NET_TC_POLICE_H

#include <net/act_api.h>

struct tcf_police_params {
 int   action;
 int   tcfp_result;
 u32   tcfp_ewma_rate;
 u32   tcfp_mtu;
 s64   tcfp_burst;
 s64   tcfp_mtu_ptoks;
 s64   tcfp_pkt_burst;
 struct psched_ratecfg rate;
 bool   rate_present;
 struct psched_ratecfg peak;
 bool   peak_present;
 struct psched_pktrate ppsrate;
 bool   pps_present;
 struct rcu_head rcu;
};

struct tcf_police {
 struct tc_action common;
 struct tcf_police_params __rcu *params;

 spinlock_t  tcfp_lock ____cacheline_aligned_in_smp;
 s64   tcfp_toks;
 s64   tcfp_ptoks;
 s64   tcfp_pkttoks;
 s64   tcfp_t_c;
};

#define to_police(pc) ((struct tcf_police *)pc)

/* old policer structure from before tc actions */
struct tc_police_compat {
 u32   index;
 int   action;
 u32   limit;
 u32   burst;
 u32   mtu;
 struct tc_ratespec rate;
 struct tc_ratespec peakrate;
};

static inline u64 tcf_police_rate_bytes_ps(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));
 return params->rate.rate_bytes_ps;
}

static inline u32 tcf_police_burst(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;
 u32 burst;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));

 /*
 *  "rate" bytes   "burst" nanoseconds
 *  ------------ * -------------------
 *    1 second          2^6 ticks
 *
 * ------------------------------------
 *        NSEC_PER_SEC nanoseconds
 *        ------------------------
 *              2^6 ticks
 *
 *    "rate" bytes   "burst" nanoseconds            2^6 ticks
 *  = ------------ * ------------------- * ------------------------
 *      1 second          2^6 ticks        NSEC_PER_SEC nanoseconds
 *
 *   "rate" * "burst"
 * = ---------------- bytes/nanosecond
 *    NSEC_PER_SEC^2
 *
 *
 *   "rate" * "burst"
 * = ---------------- bytes/second
 *     NSEC_PER_SEC
 */
 burst = div_u64(params->tcfp_burst * params->rate.rate_bytes_ps,
   NSEC_PER_SEC);

 return burst;
}

static inline u64 tcf_police_rate_pkt_ps(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));
 return params->ppsrate.rate_pkts_ps;
}

static inline u32 tcf_police_burst_pkt(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;
 u32 burst;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));

 /*
 *  "rate" pkts     "burst" nanoseconds
 *  ------------ *  -------------------
 *    1 second          2^6 ticks
 *
 * ------------------------------------
 *        NSEC_PER_SEC nanoseconds
 *        ------------------------
 *              2^6 ticks
 *
 *    "rate" pkts    "burst" nanoseconds            2^6 ticks
 *  = ------------ * ------------------- * ------------------------
 *      1 second          2^6 ticks        NSEC_PER_SEC nanoseconds
 *
 *   "rate" * "burst"
 * = ---------------- pkts/nanosecond
 *    NSEC_PER_SEC^2
 *
 *
 *   "rate" * "burst"
 * = ---------------- pkts/second
 *     NSEC_PER_SEC
 */
 burst = div_u64(params->tcfp_pkt_burst * params->ppsrate.rate_pkts_ps,
   NSEC_PER_SEC);

 return burst;
}

static inline u32 tcf_police_tcfp_mtu(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));
 return params->tcfp_mtu;
}

static inline u64 tcf_police_peakrate_bytes_ps(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));
 return params->peak.rate_bytes_ps;
}

static inline u32 tcf_police_tcfp_ewma_rate(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));
 return params->tcfp_ewma_rate;
}

static inline u16 tcf_police_rate_overhead(const struct tc_action *act)
{
 struct tcf_police *police = to_police(act);
 struct tcf_police_params *params;

 params = rcu_dereference_protected(police->params,
        lockdep_is_held(&police->tcf_lock));
 return params->rate.overhead;
}

#endif /* __NET_TC_POLICE_H */