From mboxrd@z Thu Jan  1 00:00:00 1970
From: htmldeveloper@gmail.com (Peter Teoh)
Date: Thu, 26 May 2011 10:57:28 +0800
Subject: CPU instruction to calculate tcp checksum and udp integrity?
In-Reply-To: <4A6A2125329CFD4D8CC40C9E8ABCAB9F250D8894E6@MILEXCH2.ds.jdsu.net>
References: <4A6A2125329CFD4D8CC40C9E8ABCAB9F250D8894E6@MILEXCH2.ds.jdsu.net>
Message-ID: <BANLkTimtRFFNWthCN1ziLtuNvFYAi0WHGg@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

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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-- 
Regards,
Peter Teoh