+ return cksum;
+}
+
+/**
+ * Validate the IPv6 UDP or TCP checksum.
+ *
+ * In case of UDP, the caller must first check if udp_hdr->dgram_cksum is 0:
+ * this is either invalid or means no checksum in some situations. See 8.1
+ * (Upper-Layer Checksums) in RFC 8200.
+ *
+ * @param ipv6_hdr
+ * The pointer to the contiguous IPv6 header.
+ * @param l4_hdr
+ * The pointer to the beginning of the L4 header.
+ * @return
+ * Return 0 if the checksum is correct, else -1.
+ */
+__rte_experimental
+static inline int
+rte_ipv6_udptcp_cksum_verify(const struct rte_ipv6_hdr *ipv6_hdr,
+ const void *l4_hdr)
+{
+ uint16_t cksum = __rte_ipv6_udptcp_cksum(ipv6_hdr, l4_hdr);
+
+ if (cksum != 0xffff)
+ return -1;
+
+ return 0;