Hi, I have an mbuf having IP header and data in it.So I want to pass additional data named as M1 mid of IP header and data and pass to crypto dev for hashing(M1+data) .So here I want to pass the M1 to crypto device but should not be in the mbuf memory .we can do with sgl by segmenting the mbuf and passing like chain to crypto .Is there any other method to process? With regards Rahul