RE: [PATCH net-next 1/1] hyperv: Properly handle checksum offload

[KY Srinivasan <kys@microsoft.com>]

> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Friday, April 25, 2014 5:43 PM
> To: KY Srinivasan
> Cc: davem@davemloft.net; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com; stable@kernel.org
> Subject: Re: [PATCH net-next 1/1] hyperv: Properly handle checksum offload
> 
> On Fri, 25 Apr 2014 11:45:14 -0700
> "K. Y. Srinivasan" <kys@microsoft.com> wrote:
> 
> > @@ -474,6 +477,9 @@ static int netvsc_start_xmit(struct sk_buff *skb,
> struct net_device *net)
> >  	csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
> >  			ppi->ppi_offset);
> >
> > +	ip_hdr(skb)->check = 0;
> > +	csum_info->transmit.ip_header_checksum = 1;
> > +
> >  	if (net_trans_info & (INFO_IPV4 << 16))
> >  		csum_info->transmit.is_ipv4 = 1;
> >  	else
> 
> Linux doesn't need or want IP checksum offload.
> It will not have any performance gain.

Thanks Stephen; I will  re-spin the patch and re-submit.

K. Y