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

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Date:	Sat, 26 Apr 2014 02:23:37 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"stable@...nel.org" <stable@...nel.org>
Subject: RE: [PATCH net-next 1/1]  hyperv: Properly handle checksum offload



> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@...workplumber.org]
> Sent: Friday, April 25, 2014 5:43 PM
> To: KY Srinivasan
> Cc: davem@...emloft.net; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.org; olaf@...fle.de;
> apw@...onical.com; jasowang@...hat.com; stable@...nel.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@...rosoft.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
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