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 #if LINUX_VERSION_IS_LESS(6, 0, 0)
  78
  79 #define __vstring(item, fmt, ap) __dynamic_array(char, item, 256)
  80 #define __assign_vstr(dst, fmt, va) \
  81         WARN_ON_ONCE(vsnprintf(__get_dynamic_array(dst), 256, fmt, *va) >= 256)
  82
  83 #endif /* LINUX_VERSION_IS_LESS(6, 0, 0) */
  84
  85 /* <DECLARE_EWMA> */
  86
  87 #include <linux/version.h>
  88 #include_next <linux/average.h>
  89
  90 #include <linux/bug.h>
  91
  92 #ifdef DECLARE_EWMA
  93 #undef DECLARE_EWMA
  94 #endif /* DECLARE_EWMA */
  95
  96 /*
  97  * Exponentially weighted moving average (EWMA)
  98  *
  99  * This implements a fixed-precision EWMA algorithm, with both the
 100  * precision and fall-off coefficient determined at compile-time
 101  * and built into the generated helper funtions.
 102  *
 103  * The first argument to the macro is the name that will be used
 104  * for the struct and helper functions.
 105  *
 106  * The second argument, the precision, expresses how many bits are
 107  * used for the fractional part of the fixed-precision values.
 108  *
 109  * The third argument, the weight reciprocal, determines how the
 110  * new values will be weighed vs. the old state, new values will
 111  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 112  * that this parameter must be a power of two for efficiency.
 113  */
 114
 115 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 116         struct ewma_##name {                                            \
 117                 unsigned long internal;                                 \
 118         };                                                              \
 119         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 120         {                                                               \
 121                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 122                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 123                 /*                                                      \
 124                  * Even if you want to feed it just 0/1 you should have \
 125                  * some bits for the non-fractional part...             \
 126                  */                                                     \
 127                 BUILD_BUG_ON((_precision) > 30);                        \
 128                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 129                 e->internal = 0;                                        \
 130         }                                                               \
 131         static inline unsigned long                                     \
 132         ewma_##name##_read(struct ewma_##name *e)                       \
 133         {                                                               \
 134                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 135                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 136                 BUILD_BUG_ON((_precision) > 30);                        \
 137                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 138                 return e->internal >> (_precision);                     \
 139         }                                                               \
 140         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 141                                              unsigned long val)         \
 142         {                                                               \
 143                 unsigned long internal = READ_ONCE(e->internal);        \
 144                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 145                 unsigned long precision = _precision;                   \
 146                                                                         \
 147                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 148                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 149                 BUILD_BUG_ON((_precision) > 30);                        \
 150                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 151                                                                         \
 152                 WRITE_ONCE(e->internal, internal ?                      \
 153                         (((internal << weight_rcp) - internal) +        \
 154                                 (val << precision)) >> weight_rcp :     \
 155                         (val << precision));                            \
 156         }
 157
 158 /* </DECLARE_EWMA> */