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(5, 15, 0)
  52
  53 static inline void batadv_eth_hw_addr_set(struct net_device *dev,
  54                                           const u8 *addr)
  55 {
  56         ether_addr_copy(dev->dev_addr, addr);
  57 }
  58 #define eth_hw_addr_set batadv_eth_hw_addr_set
  59
  60 #endif /* LINUX_VERSION_IS_LESS(5, 15, 0) */
  61
  62 #if LINUX_VERSION_IS_LESS(5, 18, 0)
  63
  64 #include <linux/netdevice.h>
  65
  66 static inline int batadv_netif_rx(struct sk_buff *skb)
  67 {
  68         if (in_interrupt())
  69                 return netif_rx(skb);
  70         else
  71                 return netif_rx_ni(skb);
  72 }
  73 #define netif_rx batadv_netif_rx
  74
  75 #endif /* LINUX_VERSION_IS_LESS(5, 18, 0) */
  76
  77 /* <DECLARE_EWMA> */
  78
  79 #include <linux/version.h>
  80 #include_next <linux/average.h>
  81
  82 #include <linux/bug.h>
  83
  84 #ifdef DECLARE_EWMA
  85 #undef DECLARE_EWMA
  86 #endif /* DECLARE_EWMA */
  87
  88 /*
  89  * Exponentially weighted moving average (EWMA)
  90  *
  91  * This implements a fixed-precision EWMA algorithm, with both the
  92  * precision and fall-off coefficient determined at compile-time
  93  * and built into the generated helper funtions.
  94  *
  95  * The first argument to the macro is the name that will be used
  96  * for the struct and helper functions.
  97  *
  98  * The second argument, the precision, expresses how many bits are
  99  * used for the fractional part of the fixed-precision values.
 100  *
 101  * The third argument, the weight reciprocal, determines how the
 102  * new values will be weighed vs. the old state, new values will
 103  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 104  * that this parameter must be a power of two for efficiency.
 105  */
 106
 107 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 108         struct ewma_##name {                                            \
 109                 unsigned long internal;                                 \
 110         };                                                              \
 111         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 112         {                                                               \
 113                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 114                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 115                 /*                                                      \
 116                  * Even if you want to feed it just 0/1 you should have \
 117                  * some bits for the non-fractional part...             \
 118                  */                                                     \
 119                 BUILD_BUG_ON((_precision) > 30);                        \
 120                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 121                 e->internal = 0;                                        \
 122         }                                                               \
 123         static inline unsigned long                                     \
 124         ewma_##name##_read(struct ewma_##name *e)                       \
 125         {                                                               \
 126                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 127                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 128                 BUILD_BUG_ON((_precision) > 30);                        \
 129                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 130                 return e->internal >> (_precision);                     \
 131         }                                                               \
 132         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 133                                              unsigned long val)         \
 134         {                                                               \
 135                 unsigned long internal = READ_ONCE(e->internal);        \
 136                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 137                 unsigned long precision = _precision;                   \
 138                                                                         \
 139                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 140                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 141                 BUILD_BUG_ON((_precision) > 30);                        \
 142                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 143                                                                         \
 144                 WRITE_ONCE(e->internal, internal ?                      \
 145                         (((internal << weight_rcp) - internal) +        \
 146                                 (val << precision)) >> weight_rcp :     \
 147                         (val << precision));                            \
 148         }
 149
 150 /* </DECLARE_EWMA> */