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, 10, 0)
   9
  10 #include <linux/if_bridge.h>
  11
  12 struct batadv_br_ip {
  13         union {
  14                 __be32  ip4;
  15 #if IS_ENABLED(CONFIG_IPV6)
  16                 struct in6_addr ip6;
  17 #endif
  18         } dst;
  19         __be16          proto;
  20         __u16           vid;
  21 };
  22
  23 struct batadv_br_ip_list {
  24         struct list_head list;
  25         struct batadv_br_ip addr;
  26 };
  27
  28 #if 0
  29 /* "static" dropped to force compiler to evaluate it as part of multicast.c
  30  * might need to be added again and then called in some kind of dummy
  31  * compat.c in case this header is included in multiple files.
  32  */
  33 inline void __batadv_br_ip_list_check(void)
  34 {
  35         BUILD_BUG_ON(sizeof(struct batadv_br_ip_list) != sizeof(struct br_ip_list));
  36         BUILD_BUG_ON(offsetof(struct batadv_br_ip_list, list) != offsetof(struct br_ip_list, list));
  37         BUILD_BUG_ON(offsetof(struct batadv_br_ip_list, addr) != offsetof(struct br_ip_list, addr));
  38
  39         BUILD_BUG_ON(sizeof(struct batadv_br_ip) != sizeof(struct br_ip));
  40         BUILD_BUG_ON(offsetof(struct batadv_br_ip, dst.ip4) != offsetof(struct br_ip, u.ip4));
  41         BUILD_BUG_ON(offsetof(struct batadv_br_ip, dst.ip6) != offsetof(struct br_ip, u.ip6));
  42         BUILD_BUG_ON(offsetof(struct batadv_br_ip, proto) != offsetof(struct br_ip, proto));
  43         BUILD_BUG_ON(offsetof(struct batadv_br_ip, vid) != offsetof(struct br_ip, vid));
  44 }
  45 #endif
  46
  47 #define br_ip batadv_br_ip
  48 #define br_ip_list batadv_br_ip_list
  49
  50 #endif /* LINUX_VERSION_IS_LESS(5, 10, 0) */
  51
  52 #if LINUX_VERSION_IS_LESS(5, 14, 0)
  53
  54 #include <net/addrconf.h>
  55
  56 #if IS_ENABLED(CONFIG_IPV6)
  57 static inline bool
  58 br_multicast_has_router_adjacent(struct net_device *dev, int proto)
  59 {
  60         struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
  61         struct br_ip_list *br_ip_entry, *tmp;
  62         int ret;
  63
  64         if (proto != ETH_P_IPV6)
  65                 return true;
  66
  67         ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
  68         if (ret < 0)
  69                 return true;
  70
  71         ret = false;
  72
  73         list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
  74                 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) &&
  75                     ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.dst.ip6))
  76                         ret = true;
  77
  78                 list_del(&br_ip_entry->list);
  79                 kfree(br_ip_entry);
  80         }
  81
  82         return ret;
  83 }
  84 #else
  85 static inline bool
  86 br_multicast_has_router_adjacent(struct net_device *dev, int proto)
  87 {
  88         return true;
  89 }
  90 #endif
  91
  92 #endif /* LINUX_VERSION_IS_LESS(5, 14, 0) */
  93
  94 /* <DECLARE_EWMA> */
  95
  96 #include <linux/version.h>
  97 #include_next <linux/average.h>
  98
  99 #include <linux/bug.h>
 100
 101 #ifdef DECLARE_EWMA
 102 #undef DECLARE_EWMA
 103 #endif /* DECLARE_EWMA */
 104
 105 /*
 106  * Exponentially weighted moving average (EWMA)
 107  *
 108  * This implements a fixed-precision EWMA algorithm, with both the
 109  * precision and fall-off coefficient determined at compile-time
 110  * and built into the generated helper funtions.
 111  *
 112  * The first argument to the macro is the name that will be used
 113  * for the struct and helper functions.
 114  *
 115  * The second argument, the precision, expresses how many bits are
 116  * used for the fractional part of the fixed-precision values.
 117  *
 118  * The third argument, the weight reciprocal, determines how the
 119  * new values will be weighed vs. the old state, new values will
 120  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 121  * that this parameter must be a power of two for efficiency.
 122  */
 123
 124 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 125         struct ewma_##name {                                            \
 126                 unsigned long internal;                                 \
 127         };                                                              \
 128         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 129         {                                                               \
 130                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 131                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 132                 /*                                                      \
 133                  * Even if you want to feed it just 0/1 you should have \
 134                  * some bits for the non-fractional part...             \
 135                  */                                                     \
 136                 BUILD_BUG_ON((_precision) > 30);                        \
 137                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 138                 e->internal = 0;                                        \
 139         }                                                               \
 140         static inline unsigned long                                     \
 141         ewma_##name##_read(struct ewma_##name *e)                       \
 142         {                                                               \
 143                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 144                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 145                 BUILD_BUG_ON((_precision) > 30);                        \
 146                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 147                 return e->internal >> (_precision);                     \
 148         }                                                               \
 149         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 150                                              unsigned long val)         \
 151         {                                                               \
 152                 unsigned long internal = READ_ONCE(e->internal);        \
 153                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 154                 unsigned long precision = _precision;                   \
 155                                                                         \
 156                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 157                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 158                 BUILD_BUG_ON((_precision) > 30);                        \
 159                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 160                                                                         \
 161                 WRITE_ONCE(e->internal, internal ?                      \
 162                         (((internal << weight_rcp) - internal) +        \
 163                                 (val << precision)) >> weight_rcp :     \
 164                         (val << precision));                            \
 165         }
 166
 167 /* </DECLARE_EWMA> */