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

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Date:	Wed, 05 Nov 2014 04:37:12 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Jesse Gross <jesse@...ira.com>,
	Shannon Nelson <shannon.nelson@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc:	Joe Stringer <joestringer@...ira.com>,
	netdev <netdev@...r.kernel.org>,
	Sathya Perla <sathya.perla@...lex.com>, linux.nics@...el.com,
	amirv@...lanox.com, shahed.shaikh@...gic.com,
	Dept-GELinuxNICDev@...gic.com, Tom Herbert <therbert@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 2/5] i40e: Implement ndo_gso_check()

On Tue, 2014-11-04 at 15:45 -0800, 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/xl710-10-40-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 believe you are correct Jesse, but I will let Shannon Nelson or Jesse
Brandeburg respond since they are the i40e maintainers.

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