batman-adv/src/compat-hacks.h

   1 /* Please avoid adding hacks here - instead add it to mac80211/backports.git */
   2
   3 #undef CONFIG_MODULE_STRIPPED
   4
   5 #include <linux/version.h>      /* LINUX_VERSION_CODE */
   6 #include <linux/types.h>
   7
   8 #if LINUX_VERSION_IS_LESS(6, 0, 0)
   9
  10 #define __vstring(item, fmt, ap) __dynamic_array(char, item, 256)
  11 #define __assign_vstr(dst, fmt, va) \
  12         WARN_ON_ONCE(vsnprintf(__get_dynamic_array(dst), 256, fmt, *va) >= 256)
  13
  14 #endif /* LINUX_VERSION_IS_LESS(6, 0, 0) */
  15
  16 #if LINUX_VERSION_IS_LESS(6, 2, 0)
  17
  18 #include <linux/random.h>
  19
  20 #define genl_split_ops genl_ops
  21
  22 static inline u32 batadv_get_random_u32_below(u32 ep_ro)
  23 {
  24         return prandom_u32_max(ep_ro);
  25 }
  26
  27 #define get_random_u32_below batadv_get_random_u32_below
  28
  29 #endif /* LINUX_VERSION_IS_LESS(6, 2, 0) */
  30
  31 #if LINUX_VERSION_IS_LESS(6, 4, 0) && \
  32     !(LINUX_VERSION_IS_GEQ(5, 10, 205) && LINUX_VERSION_IS_LESS(5, 11, 0)) && \
  33     !(LINUX_VERSION_IS_GEQ(5, 15, 144) && LINUX_VERSION_IS_LESS(5, 16, 0)) && \
  34     !(LINUX_VERSION_IS_GEQ(6, 1, 69) && LINUX_VERSION_IS_LESS(6, 2, 0))
  35
  36 #include <linux/if_vlan.h>
  37
  38 /* Prefer this version in TX path, instead of
  39  * skb_reset_mac_header() + vlan_eth_hdr()
  40  */
  41 static inline struct vlan_ethhdr *skb_vlan_eth_hdr(const struct sk_buff *skb)
  42 {
  43         return (struct vlan_ethhdr *)skb->data;
  44 }
  45
  46 #endif /* LINUX_VERSION_IS_LESS(6, 4, 0) */
  47
  48 /* <DECLARE_EWMA> */
  49
  50 #include <linux/version.h>
  51 #include_next <linux/average.h>
  52
  53 #include <linux/bug.h>
  54
  55 #ifdef DECLARE_EWMA
  56 #undef DECLARE_EWMA
  57 #endif /* DECLARE_EWMA */
  58
  59 /*
  60  * Exponentially weighted moving average (EWMA)
  61  *
  62  * This implements a fixed-precision EWMA algorithm, with both the
  63  * precision and fall-off coefficient determined at compile-time
  64  * and built into the generated helper funtions.
  65  *
  66  * The first argument to the macro is the name that will be used
  67  * for the struct and helper functions.
  68  *
  69  * The second argument, the precision, expresses how many bits are
  70  * used for the fractional part of the fixed-precision values.
  71  *
  72  * The third argument, the weight reciprocal, determines how the
  73  * new values will be weighed vs. the old state, new values will
  74  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
  75  * that this parameter must be a power of two for efficiency.
  76  */
  77
  78 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
  79         struct ewma_##name {                                            \
  80                 unsigned long internal;                                 \
  81         };                                                              \
  82         static inline void ewma_##name##_init(struct ewma_##name *e)    \
  83         {                                                               \
  84                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
  85                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
  86                 /*                                                      \
  87                  * Even if you want to feed it just 0/1 you should have \
  88                  * some bits for the non-fractional part...             \
  89                  */                                                     \
  90                 BUILD_BUG_ON((_precision) > 30);                        \
  91                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
  92                 e->internal = 0;                                        \
  93         }                                                               \
  94         static inline unsigned long                                     \
  95         ewma_##name##_read(struct ewma_##name *e)                       \
  96         {                                                               \
  97                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
  98                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
  99                 BUILD_BUG_ON((_precision) > 30);                        \
 100                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 101                 return e->internal >> (_precision);                     \
 102         }                                                               \
 103         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 104                                              unsigned long val)         \
 105         {                                                               \
 106                 unsigned long internal = READ_ONCE(e->internal);        \
 107                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 108                 unsigned long precision = _precision;                   \
 109                                                                         \
 110                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 111                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 112                 BUILD_BUG_ON((_precision) > 30);                        \
 113                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 114                                                                         \
 115                 WRITE_ONCE(e->internal, internal ?                      \
 116                         (((internal << weight_rcp) - internal) +        \
 117                                 (val << precision)) >> weight_rcp :     \
 118                         (val << precision));                            \
 119         }
 120
 121 /* </DECLARE_EWMA> */