compat: backport skb_checksum_none_assert

This is needed by atlx, b44, atl1c and atl1e.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/include/linux/compat-2.6.37.h b/include/linux/compat-2.6.37.h
index 5bd6edb03f382deb7a1d86e5daefc4e510bb3ebe..8ea0bab542b87dff6d4d1358b97eadb25cdd59c4 100644 (file)
--- a/include/linux/compat-2.6.37.h
+++ b/include/linux/compat-2.6.37.h
@@ -5,6 +5,8 @@
 
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37))
 
+#include <linux/skbuff.h>
+
 /*
  * This is not part of The 2.6.37 kernel yet but we
  * we use it to optimize the backport code we
@@ -26,6 +28,21 @@
 
 extern struct kobj_ns_type_operations net_ns_type_operations;
 
+/**
+ * skb_checksum_none_assert - make sure skb ip_summed is CHECKSUM_NONE
+ * @skb: skb to check
+ *
+ * fresh skbs have their ip_summed set to CHECKSUM_NONE.
+ * Instead of forcing ip_summed to CHECKSUM_NONE, we can
+ * use this helper, to document places where we make this assertion.
+ */
+static inline void skb_checksum_none_assert(struct sk_buff *skb)
+{
+#ifdef DEBUG
+       BUG_ON(skb->ip_summed != CHECKSUM_NONE);
+#endif
+}
+
 #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)) */
 
 #endif /* LINUX_26_37_COMPAT_H */