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

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Message-ID: <1398474927.29914.100.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 25 Apr 2014 18:15:27 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>, 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, 2014-04-25 at 17:43 -0700, Stephen Hemminger wrote:
> 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.


BTW, was this patch even tested with IPv6 packets ???


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