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 <linux/if_bridge.h>
  55 #include <net/addrconf.h>
  56
  57 #if IS_ENABLED(CONFIG_IPV6)
  58 static inline bool
  59 br_multicast_has_router_adjacent(struct net_device *dev, int proto)
  60 {
  61         struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
  62         struct br_ip_list *br_ip_entry, *tmp;
  63         int ret;
  64
  65         if (proto != ETH_P_IPV6)
  66                 return true;
  67
  68         ret = br_multicast_list_adjacent(dev, &bridge_mcast_list);
  69         if (ret < 0)
  70                 return true;
  71
  72         ret = false;
  73
  74         list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) {
  75                 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) &&
  76                     ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.dst.ip6))
  77                         ret = true;
  78
  79                 list_del(&br_ip_entry->list);
  80                 kfree(br_ip_entry);
  81         }
  82
  83         return ret;
  84 }
  85 #else
  86 static inline bool
  87 br_multicast_has_router_adjacent(struct net_device *dev, int proto)
  88 {
  89         return true;
  90 }
  91 #endif
  92
  93 #endif /* LINUX_VERSION_IS_LESS(5, 14, 0) */
  94
  95 /* <DECLARE_EWMA> */
  96
  97 #include <linux/version.h>
  98 #include_next <linux/average.h>
  99
 100 #include <linux/bug.h>
 101
 102 #ifdef DECLARE_EWMA
 103 #undef DECLARE_EWMA
 104 #endif /* DECLARE_EWMA */
 105
 106 /*
 107  * Exponentially weighted moving average (EWMA)
 108  *
 109  * This implements a fixed-precision EWMA algorithm, with both the
 110  * precision and fall-off coefficient determined at compile-time
 111  * and built into the generated helper funtions.
 112  *
 113  * The first argument to the macro is the name that will be used
 114  * for the struct and helper functions.
 115  *
 116  * The second argument, the precision, expresses how many bits are
 117  * used for the fractional part of the fixed-precision values.
 118  *
 119  * The third argument, the weight reciprocal, determines how the
 120  * new values will be weighed vs. the old state, new values will
 121  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 122  * that this parameter must be a power of two for efficiency.
 123  */
 124
 125 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 126         struct ewma_##name {                                            \
 127                 unsigned long internal;                                 \
 128         };                                                              \
 129         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 130         {                                                               \
 131                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 132                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 133                 /*                                                      \
 134                  * Even if you want to feed it just 0/1 you should have \
 135                  * some bits for the non-fractional part...             \
 136                  */                                                     \
 137                 BUILD_BUG_ON((_precision) > 30);                        \
 138                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 139                 e->internal = 0;                                        \
 140         }                                                               \
 141         static inline unsigned long                                     \
 142         ewma_##name##_read(struct ewma_##name *e)                       \
 143         {                                                               \
 144                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 145                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 146                 BUILD_BUG_ON((_precision) > 30);                        \
 147                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 148                 return e->internal >> (_precision);                     \
 149         }                                                               \
 150         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 151                                              unsigned long val)         \
 152         {                                                               \
 153                 unsigned long internal = READ_ONCE(e->internal);        \
 154                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 155                 unsigned long precision = _precision;                   \
 156                                                                         \
 157                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 158                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 159                 BUILD_BUG_ON((_precision) > 30);                        \
 160                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 161                                                                         \
 162                 WRITE_ONCE(e->internal, internal ?                      \
 163                         (((internal << weight_rcp) - internal) +        \
 164                                 (val << precision)) >> weight_rcp :     \
 165                         (val << precision));                            \
 166         }
 167
 168 /* </DECLARE_EWMA> */