datapath: Rename linux-2.6 and compat-2.6 directories.

[sliver-openvswitch.git] / datapath / linux / compat / include / net / checksum.h

diff --git a/datapath/linux/compat/include/net/checksum.h b/datapath/linux/compat/include/net/checksum.h
new file mode 100644 (file)
index 0000000..73f2f59
--- /dev/null
+++ b/datapath/linux/compat/include/net/checksum.h
@@ -0,0 +1,36 @@
+#ifndef __NET_CHECKSUM_WRAPPER_H
+#define __NET_CHECKSUM_WRAPPER_H 1
+
+#include_next <net/checksum.h>
+
+#ifndef HAVE_CSUM_UNFOLD
+static inline __wsum csum_unfold(__sum16 n)
+{
+       return (__force __wsum)n;
+}
+#endif /* !HAVE_CSUM_UNFOLD */
+
+/* Workaround for debugging included in certain versions of XenServer.  It only
+ * applies to 32-bit x86.
+ */
+#if defined(HAVE_CSUM_COPY_DBG) && defined(CONFIG_X86_32)
+#define csum_and_copy_to_user(src, dst, len, sum, err_ptr) \
+       csum_and_copy_to_user(src, dst, len, sum, NULL, err_ptr)
+#endif
+
+#ifndef HAVE_CSUM_REPLACE4
+static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to)
+{
+       __be32 diff[] = { ~from, to };
+
+       *sum = csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum_unfold(*sum)));
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
+#define inet_proto_csum_replace2(sum, skb, from, to, pseudohdr) \
+       inet_proto_csum_replace4(sum, skb, (__force __be32)(from), \
+                                          (__force __be32)(to), pseudohdr)
+#endif
+
+#endif /* checksum.h */