datapath/linux-2.6/compat-2.6/include/net/checksum.h

   1 #ifndef __NET_CHECKSUM_WRAPPER_H
   2 #define __NET_CHECKSUM_WRAPPER_H 1
   3
   4 #include_next <net/checksum.h>
   5
   6 #ifndef HAVE_CSUM_UNFOLD
   7 static inline __wsum csum_unfold(__sum16 n)
   8 {
   9         return (__force __wsum)n;
  10 }
  11 #endif /* !HAVE_CSUM_UNFOLD */
  12
  13 /* Workaround for debugging included in certain versions of XenServer.  It only
  14  * applies to 32-bit x86.
  15  */
  16 #if defined(HAVE_CSUM_COPY_DBG) && defined(CONFIG_X86_32)
  17 #define csum_and_copy_to_user(src, dst, len, sum, err_ptr) \
  18         csum_and_copy_to_user(src, dst, len, sum, NULL, err_ptr)
  19 #endif
  20
  21 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
  22 static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to)
  23 {
  24         __be32 diff[] = { ~from, to };
  25
  26         *sum = csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum_unfold(*sum)));
  27 }
  28
  29 #define inet_proto_csum_replace2(sum, skb, from, to, pseudohdr) \
  30         inet_proto_csum_replace4(sum, skb, (__force __be32)(from), \
  31                                            (__force __be32)(to), pseudohdr)
  32 #endif
  33
  34 #endif /* checksum.h */