batman-adv/files/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_CODE < KERNEL_VERSION(4, 1, 0)
   9
  10 #define dev_get_iflink(_net_dev) ((_net_dev)->iflink)
  11
  12 #endif /* < KERNEL_VERSION(4, 1, 0) */
  13
  14 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
  15
  16 /* Linux 3.15 misses the uapi include.... */
  17 #include <uapi/linux/nl80211.h>
  18
  19 #endif /* < KERNEL_VERSION(3, 16, 0) */
  20
  21 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)
  22
  23 #include <linux/netdevice.h>
  24
  25 #define netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info) ({\
  26         BUILD_BUG_ON(upper_priv != NULL); \
  27         BUILD_BUG_ON(upper_info != NULL); \
  28         netdev_set_master(dev, upper_dev); \
  29 })
  30
  31 #elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
  32
  33 #include <linux/netdevice.h>
  34
  35 #define netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info) ({\
  36         BUILD_BUG_ON(upper_priv != NULL); \
  37         BUILD_BUG_ON(upper_info != NULL); \
  38         netdev_master_upper_dev_link(dev, upper_dev); \
  39 })
  40
  41 #endif /* < KERNEL_VERSION(4, 5, 0) */
  42
  43
  44 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0)
  45
  46 /* for batadv_v_elp_get_throughput which would have used
  47  * STATION_INFO_EXPECTED_THROUGHPUT in Linux 4.0.0
  48  */
  49 #define NL80211_STA_INFO_EXPECTED_THROUGHPUT    28
  50
  51 /* wild hack for batadv_getlink_net only */
  52 #define get_link_net get_xstats_size || 1 ? fallback_net : (struct net*)netdev->rtnl_link_ops->get_xstats_size
  53
  54 #endif /* < KERNEL_VERSION(4, 0, 0) */
  55
  56
  57 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
  58
  59 struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb,
  60                                      unsigned int transport_len,
  61                                      __sum16(*skb_chkf)(struct sk_buff *skb));
  62
  63 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed);
  64
  65 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
  66
  67 #endif /* < KERNEL_VERSION(4, 2, 0) */
  68
  69 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
  70
  71 #define IFF_NO_QUEUE    0; dev->tx_queue_len = 0
  72
  73 static inline bool hlist_fake(struct hlist_node *h)
  74 {
  75         return h->pprev == &h->next;
  76 }
  77
  78 #endif /* < KERNEL_VERSION(4, 3, 0) */
  79
  80 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
  81
  82 #include <linux/ethtool.h>
  83
  84 #define ethtool_link_ksettings batadv_ethtool_link_ksettings
  85
  86 struct batadv_ethtool_link_ksettings {
  87         struct {
  88                 __u32   speed;
  89                 __u8    duplex;
  90         } base;
  91 };
  92
  93 #define __ethtool_get_link_ksettings(__dev, __link_settings) \
  94         batadv_ethtool_get_link_ksettings(__dev, __link_settings)
  95
  96 static inline int
  97 batadv_ethtool_get_link_ksettings(struct net_device *dev,
  98                                   struct ethtool_link_ksettings *link_ksettings)
  99 {
 100         struct ethtool_cmd cmd;
 101         int ret;
 102
 103         memset(&cmd, 0, sizeof(cmd));
 104         ret = __ethtool_get_settings(dev, &cmd);
 105
 106         if (ret != 0)
 107                 return ret;
 108
 109         link_ksettings->base.duplex = cmd.duplex;
 110         link_ksettings->base.speed = ethtool_cmd_speed(&cmd);
 111
 112         return 0;
 113 }
 114
 115 #endif /* < KERNEL_VERSION(4, 6, 0) */
 116
 117 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0)
 118
 119 #define netif_trans_update batadv_netif_trans_update
 120 static inline void batadv_netif_trans_update(struct net_device *dev)
 121 {
 122         dev->trans_start = jiffies;
 123 }
 124
 125 #endif /* < KERNEL_VERSION(4, 7, 0) */
 126
 127
 128 #include_next <linux/netlink.h>
 129
 130 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0)
 131
 132 #include_next <net/netlink.h>
 133
 134 static inline bool batadv_nla_need_padding_for_64bit(struct sk_buff *skb);
 135
 136 static inline int batadv_nla_align_64bit(struct sk_buff *skb, int padattr)
 137 {
 138         if (batadv_nla_need_padding_for_64bit(skb) &&
 139             !nla_reserve(skb, padattr, 0))
 140                 return -EMSGSIZE;
 141
 142         return 0;
 143 }
 144
 145 static inline struct nlattr *batadv__nla_reserve_64bit(struct sk_buff *skb,
 146                                                        int attrtype,
 147                                                        int attrlen, int padattr)
 148 {
 149         if (batadv_nla_need_padding_for_64bit(skb))
 150                 batadv_nla_align_64bit(skb, padattr);
 151
 152         return __nla_reserve(skb, attrtype, attrlen);
 153 }
 154
 155 static inline void batadv__nla_put_64bit(struct sk_buff *skb, int attrtype,
 156                                          int attrlen, const void *data,
 157                                          int padattr)
 158 {
 159         struct nlattr *nla;
 160
 161         nla = batadv__nla_reserve_64bit(skb, attrtype, attrlen, padattr);
 162         memcpy(nla_data(nla), data, attrlen);
 163 }
 164
 165 static inline bool batadv_nla_need_padding_for_64bit(struct sk_buff *skb)
 166 {
 167 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 168         /* The nlattr header is 4 bytes in size, that's why we test
 169          * if the skb->data _is_ aligned.  A NOP attribute, plus
 170          * nlattr header for next attribute, will make nla_data()
 171          * 8-byte aligned.
 172          */
 173         if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8))
 174                 return true;
 175 #endif
 176         return false;
 177 }
 178
 179 static inline int batadv_nla_total_size_64bit(int payload)
 180 {
 181         return NLA_ALIGN(nla_attr_size(payload))
 182 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 183                 + NLA_ALIGN(nla_attr_size(0))
 184 #endif
 185                 ;
 186 }
 187
 188 static inline int batadv_nla_put_64bit(struct sk_buff *skb, int attrtype,
 189                                        int attrlen, const void *data,
 190                                        int padattr)
 191 {
 192         size_t len;
 193
 194         if (batadv_nla_need_padding_for_64bit(skb))
 195                 len = batadv_nla_total_size_64bit(attrlen);
 196         else
 197                 len = nla_total_size(attrlen);
 198         if (unlikely(skb_tailroom(skb) < len))
 199                 return -EMSGSIZE;
 200
 201         batadv__nla_put_64bit(skb, attrtype, attrlen, data, padattr);
 202         return 0;
 203 }
 204
 205 #define nla_put_u64_64bit(_skb, _attrtype, _value, _padattr) \
 206         batadv_nla_put_u64_64bit(_skb, _attrtype, _value, _padattr)
 207 static inline int batadv_nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
 208                                            u64 value, int padattr)
 209 {
 210         return batadv_nla_put_64bit(skb, attrtype, sizeof(u64), &value,
 211                                     padattr);
 212 }
 213
 214 #endif /* < KERNEL_VERSION(4, 7, 0) */
 215
 216
 217 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
 218
 219 #include_next <linux/cache.h>
 220
 221 /* hack for netlink.c which marked the family ops as ro */
 222 #ifdef __ro_after_init
 223 #undef __ro_after_init
 224 #endif
 225 #define __ro_after_init
 226
 227 #endif /* < KERNEL_VERSION(4, 10, 0) */
 228
 229 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 9)
 230
 231 /* work around missing attribute needs_free_netdev and priv_destructor in
 232  * net_device
 233  */
 234 #define ether_setup(dev) \
 235         void batadv_softif_free2(struct net_device *dev) \
 236         { \
 237                 batadv_softif_free(dev); \
 238                 free_netdev(dev); \
 239         } \
 240         void (*t1)(struct net_device *dev) __attribute__((unused)); \
 241         bool t2 __attribute__((unused)); \
 242         ether_setup(dev)
 243 #define needs_free_netdev destructor = batadv_softif_free2; t2
 244 #define priv_destructor destructor = batadv_softif_free2; t1
 245
 246 #endif /* < KERNEL_VERSION(4, 11, 9) */
 247
 248 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 249
 250 static inline void *batadv_skb_put(struct sk_buff *skb, unsigned int len)
 251 {
 252         return (void *)skb_put(skb, len);
 253 }
 254 #define skb_put batadv_skb_put
 255
 256 static inline void *skb_put_zero(struct sk_buff *skb, unsigned int len)
 257 {
 258         void *tmp = skb_put(skb, len);
 259
 260         memset(tmp, 0, len);
 261
 262         return tmp;
 263 }
 264
 265 static inline void *skb_put_data(struct sk_buff *skb, const void *data,
 266                                  unsigned int len)
 267 {
 268         void *tmp = skb_put(skb, len);
 269
 270         memcpy(tmp, data, len);
 271
 272         return tmp;
 273 }
 274
 275 #endif /* < KERNEL_VERSION(4, 13, 0) */
 276
 277 /* <DECLARE_EWMA> */
 278
 279 #include <linux/version.h>
 280 #include_next <linux/average.h>
 281
 282 #include <linux/bug.h>
 283
 284 #ifdef DECLARE_EWMA
 285 #undef DECLARE_EWMA
 286 #endif /* DECLARE_EWMA */
 287
 288 /*
 289  * Exponentially weighted moving average (EWMA)
 290  *
 291  * This implements a fixed-precision EWMA algorithm, with both the
 292  * precision and fall-off coefficient determined at compile-time
 293  * and built into the generated helper funtions.
 294  *
 295  * The first argument to the macro is the name that will be used
 296  * for the struct and helper functions.
 297  *
 298  * The second argument, the precision, expresses how many bits are
 299  * used for the fractional part of the fixed-precision values.
 300  *
 301  * The third argument, the weight reciprocal, determines how the
 302  * new values will be weighed vs. the old state, new values will
 303  * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 304  * that this parameter must be a power of two for efficiency.
 305  */
 306
 307 #define DECLARE_EWMA(name, _precision, _weight_rcp)                     \
 308         struct ewma_##name {                                            \
 309                 unsigned long internal;                                 \
 310         };                                                              \
 311         static inline void ewma_##name##_init(struct ewma_##name *e)    \
 312         {                                                               \
 313                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 314                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 315                 /*                                                      \
 316                  * Even if you want to feed it just 0/1 you should have \
 317                  * some bits for the non-fractional part...             \
 318                  */                                                     \
 319                 BUILD_BUG_ON((_precision) > 30);                        \
 320                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 321                 e->internal = 0;                                        \
 322         }                                                               \
 323         static inline unsigned long                                     \
 324         ewma_##name##_read(struct ewma_##name *e)                       \
 325         {                                                               \
 326                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 327                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 328                 BUILD_BUG_ON((_precision) > 30);                        \
 329                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 330                 return e->internal >> (_precision);                     \
 331         }                                                               \
 332         static inline void ewma_##name##_add(struct ewma_##name *e,     \
 333                                              unsigned long val)         \
 334         {                                                               \
 335                 unsigned long internal = ACCESS_ONCE(e->internal);      \
 336                 unsigned long weight_rcp = ilog2(_weight_rcp);          \
 337                 unsigned long precision = _precision;                   \
 338                                                                         \
 339                 BUILD_BUG_ON(!__builtin_constant_p(_precision));        \
 340                 BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp));       \
 341                 BUILD_BUG_ON((_precision) > 30);                        \
 342                 BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp);               \
 343                                                                         \
 344                 ACCESS_ONCE(e->internal) = internal ?                   \
 345                         (((internal << weight_rcp) - internal) +        \
 346                                 (val << precision)) >> weight_rcp :     \
 347                         (val << precision);                             \
 348         }
 349
 350 /* </DECLARE_EWMA> */