In net/ipv4/tcp_ipv4.c: /* This routine computes an IPv4 TCP checksum. */ void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) { struct inet_sock *inet = inet_sk(sk); __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); } EXPORT_SYMBOL(tcp_v4_send_check); On Mon, May 23, 2011 at 11:26 PM, Jon Zhou <Jon.Zhou@jdsu.com> wrote:

hi now I am using sw to calculate the tcp checksum, is there CPU(nehalem) instruction or NIC /kernel API to do such thing?

thanks a lot jon

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