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 #if LINUX_VERSION_IS_LESS(6, 4, 0)
  75
  76 #include <linux/if_vlan.h>
  77
  78 /* Prefer this version in TX path, instead of
  79  * skb_reset_mac_header() + vlan_eth_hdr()
  80  */
  81 static inline struct vlan_ethhdr *skb_vlan_eth_hdr(const struct sk_buff *skb)
  82 {
  83         return (struct vlan_ethhdr *)skb->data;
  84 }
  85
  86 #endif /* LINUX_VERSION_IS_LESS(6, 4, 0) */
  87
  88 /* <DECLARE_EWMA> */
  89
  90 #include <linux/version.h>
  91 #include_next <linux/average.h>
  92
  93 #include <linux/bug.h>
  94
  95 #ifdef DECLARE_EWMA
  96 #undef DECLARE_EWMA
  97 #endif /* DECLARE_EWMA */
  98
  99 /*
 100  * Exponentially weighted moving average (EWMA)
 101  *
 102  * This implements a fixed-precision EWMA algorithm, with both the
 103  * precision and fall-off coefficient determined at compile-time
 104  * and built into the generated helper funtions.
 105  *
 106  * The first argument to the macro is the name that will be used
 107  * for the struct and helper functions.
 108  *
 109  * The second argument, the precision, expresses how many bits are
 110  * used for the fractional part of the fixed-precision values.
 111  *
 112  * The third argument, the weight reciprocal, determines how the
 113  * new values will be weighed vs. the old state, new values will
 114  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 115  * that this parameter must be a power of two for efficiency.
 116  */
 117
 118 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 119         struct ewma_##name {                                            \
 120                 unsigned long internal;                                 \
 121         };                                                              \
 122         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 123         {                                                               \
 124                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 125                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 126                 /*                                                      \
 127                  * Even if you want to feed it just 0/1 you should have \
 128                  * some bits for the non-fractional part...             \
 129                  */                                                     \
 130                 BUILD_BUG_ON((_precision) > 30);                        \
 131                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 132                 e->internal = 0;                                        \
 133         }                                                               \
 134         static inline unsigned long                                     \
 135         ewma_##name##_read(struct ewma_##name *e)                       \
 136         {                                                               \
 137                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 138                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 139                 BUILD_BUG_ON((_precision) > 30);                        \
 140                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 141                 return e->internal >> (_precision);                     \
 142         }                                                               \
 143         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 144                                              unsigned long val)         \
 145         {                                                               \
 146                 unsigned long internal = READ_ONCE(e->internal);        \
 147                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 148                 unsigned long precision = _precision;                   \
 149                                                                         \
 150                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 151                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 152                 BUILD_BUG_ON((_precision) > 30);                        \
 153                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 154                                                                         \
 155                 WRITE_ONCE(e->internal, internal ?                      \
 156                         (((internal << weight_rcp) - internal) +        \
 157                                 (val << precision)) >> weight_rcp :     \
 158                         (val << precision));                            \
 159         }
 160
 161 /* </DECLARE_EWMA> */