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(5, 14, 0)
   9
  10 #include <linux/if_bridge.h>
  11 #include <net/addrconf.h>
  12
  13 #if IS_ENABLED(CONFIG_IPV6)
  14 static inline bool
  15 br_multicast_has_router_adjacent(struct net_device *dev, int proto)
  16 {
  17         struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
  18         struct br_ip_list *br_ip_entry, *tmp;
  19         int ret;
  20
  21         if (proto != ETH_P_IPV6)
  22                 return true;
  23
  24         ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
  25         if (ret < 0)
  26                 return true;
  27
  28         ret = false;
  29
  30         list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
  31                 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) &&
  32                     ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.dst.ip6))
  33                         ret = true;
  34
  35                 list_del(&br_ip_entry->list);
  36                 kfree(br_ip_entry);
  37         }
  38
  39         return ret;
  40 }
  41 #else
  42 static inline bool
  43 br_multicast_has_router_adjacent(struct net_device *dev, int proto)
  44 {
  45         return true;
  46 }
  47 #endif
  48
  49 #endif /* LINUX_VERSION_IS_LESS(5, 14, 0) */
  50
  51 #if LINUX_VERSION_IS_LESS(6, 0, 0)
  52
  53 #define __vstring(item, fmt, ap) __dynamic_array(char, item, 256)
  54 #define __assign_vstr(dst, fmt, va) \
  55         WARN_ON_ONCE(vsnprintf(__get_dynamic_array(dst), 256, fmt, *va) >= 256)
  56
  57 #endif /* LINUX_VERSION_IS_LESS(6, 0, 0) */
  58
  59 #if LINUX_VERSION_IS_LESS(6, 2, 0)
  60
  61 #include <linux/random.h>
  62
  63 #define genl_split_ops genl_ops
  64
  65 static inline u32 batadv_get_random_u32_below(u32 ep_ro)
  66 {
  67         return prandom_u32_max(ep_ro);
  68 }
  69
  70 #define get_random_u32_below batadv_get_random_u32_below
  71
  72 #endif /* LINUX_VERSION_IS_LESS(6, 2, 0) */
  73
  74 /* <DECLARE_EWMA> */
  75
  76 #include <linux/version.h>
  77 #include_next <linux/average.h>
  78
  79 #include <linux/bug.h>
  80
  81 #ifdef DECLARE_EWMA
  82 #undef DECLARE_EWMA
  83 #endif /* DECLARE_EWMA */
  84
  85 /*
  86  * Exponentially weighted moving average (EWMA)
  87  *
  88  * This implements a fixed-precision EWMA algorithm, with both the
  89  * precision and fall-off coefficient determined at compile-time
  90  * and built into the generated helper funtions.
  91  *
  92  * The first argument to the macro is the name that will be used
  93  * for the struct and helper functions.
  94  *
  95  * The second argument, the precision, expresses how many bits are
  96  * used for the fractional part of the fixed-precision values.
  97  *
  98  * The third argument, the weight reciprocal, determines how the
  99  * new values will be weighed vs. the old state, new values will
 100  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 101  * that this parameter must be a power of two for efficiency.
 102  */
 103
 104 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 105         struct ewma_##name {                                            \
 106                 unsigned long internal;                                 \
 107         };                                                              \
 108         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 109         {                                                               \
 110                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 111                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 112                 /*                                                      \
 113                  * Even if you want to feed it just 0/1 you should have \
 114                  * some bits for the non-fractional part...             \
 115                  */                                                     \
 116                 BUILD_BUG_ON((_precision) > 30);                        \
 117                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 118                 e->internal = 0;                                        \
 119         }                                                               \
 120         static inline unsigned long                                     \
 121         ewma_##name##_read(struct ewma_##name *e)                       \
 122         {                                                               \
 123                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 124                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 125                 BUILD_BUG_ON((_precision) > 30);                        \
 126                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 127                 return e->internal >> (_precision);                     \
 128         }                                                               \
 129         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 130                                              unsigned long val)         \
 131         {                                                               \
 132                 unsigned long internal = READ_ONCE(e->internal);        \
 133                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 134                 unsigned long precision = _precision;                   \
 135                                                                         \
 136                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 137                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 138                 BUILD_BUG_ON((_precision) > 30);                        \
 139                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 140                                                                         \
 141                 WRITE_ONCE(e->internal, internal ?                      \
 142                         (((internal << weight_rcp) - internal) +        \
 143                                 (val << precision)) >> weight_rcp :     \
 144                         (val << precision));                            \
 145         }
 146
 147 /* </DECLARE_EWMA> */