datapath: Avoid backported csum_replace4() on RHEL 5.

[sliver-openvswitch.git] / datapath / linux-2.6 / compat-2.6 / include / net / checksum.h

diff --git a/datapath/linux-2.6/compat-2.6/include/net/checksum.h b/datapath/linux-2.6/compat-2.6/include/net/checksum.h
index 3b6debb..73f2f59 100644 (file)
--- a/datapath/linux-2.6/compat-2.6/include/net/checksum.h
+++ b/datapath/linux-2.6/compat-2.6/include/net/checksum.h
@@ -10,4 +10,27 @@ static inline __wsum csum_unfold(__sum16 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 */