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

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Date:	Tue, 4 Nov 2014 15:45:22 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Joe Stringer <joestringer@...ira.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Sathya Perla <sathya.perla@...lex.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.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, 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?
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