include/net/tc_act/tc_police.h

   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
  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
  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
  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
 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 */