netdev - Re: [PATCH net 2/5] i40e: Implement ndo_gso

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Message-Id: <201411201116.04406.joestringer@nicira.com>
Date:	Thu, 20 Nov 2014 11:16:03 -0800
From:	Joe Stringer <joestringer@...ira.com>
To:	Jesse Gross <jesse@...ira.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	linux.nics@...el.com, Tom Herbert <therbert@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Shannon Nelson <shannon.nelson@...el.com>,
	jesse.brandeburg@...el.com
Subject: Re: [PATCH net 2/5] i40e: Implement ndo_gso_check()

On Tuesday, November 04, 2014 15:45:22 Jesse Gross wrote:
> On Tue, Nov 4, 2014 at 1:56 PM, Joe Stringer <joestringer@...ira.com> wrote:
> > diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c
> > b/drivers/net/ethernet/intel/i40e/i40e_main.c index c3a7f4a..21829b5
> > 100644
> > --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> > +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> > +static bool i40e_gso_check(struct sk_buff *skb, struct net_device *dev)
> > +{
> > +       if ((skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) &&
> > +           (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
> > +            skb->inner_protocol != htons(ETH_P_TEB) ||
> > +            skb_inner_mac_header(skb) - skb_transport_header(skb) > 64))
> > +               return false;
> 
> I think it may be possible to even support a few more things here.
> According to the datasheet here:
> http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/xl71
> 0-10-40-controller-datasheet.pdf
> 
> This can actually support 64 bytes beyond the tunnel header, which
> would make for a total of 80 bytes. It looks like it can also support
> IPv4 or IPv6 beyond just Ethernet as the encapsulated protocol.
> 
> Intel guys, can you confirm that this is correct?

I'm just respinning this for v4/6 beyond GRE/UDP tunnel and IPIP, and I found 
the description of max protocol parsing size of 480B (with individual header 
limit of 255B). I couldn't find where you get this 64/80 number or which 
headers it maps to. Could you (or one of the intel guys) expand on this?
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