CPU instruction to calculate tcp checksum and udp integrity?

CPU instruction to calculate tcp checksum and udp integrity?

[Jon Zhou]

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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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CPU instruction to calculate tcp checksum and udp integrity?

[Jon Zhou]

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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Re: CPU instruction to calculate tcp checksum and udp integrity?

[Peter Teoh]

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
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>



-- 
Regards,
Peter Teoh

CPU instruction to calculate tcp checksum and udp integrity?

[Peter Teoh]

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
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>



-- 
Regards,
Peter Teoh