netdev - Re: [net-next 1/4] i40e/i40evf: Add capability exchange for outer checksum

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Date:   Fri, 7 Apr 2017 09:38:32 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     David Miller <davem@...emloft.net>,
        Preethi Banala <preethi.banala@...el.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "jogreene@...hat.com" <jogreene@...hat.com>,
        Alan Brady <alan.brady@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jacob Keller <jacob.e.keller@...el.com>
Subject: Re: [net-next 1/4] i40e/i40evf: Add capability exchange for outer checksum

On Fri, Apr 7, 2017 at 6:23 AM, Jeff Kirsher
<jeffrey.t.kirsher@...el.com> wrote:
> From: Preethi Banala <preethi.banala@...el.com>
>
> This patch adds a capability negotiation between VF and PF using ENCAP/
> ENCAP_CSUM offload flags in order for the VF to support outer checksum
> and TSO offloads for encapsulated packets.

[...]
-#define I40E_VIRTCHNL_VF_OFFLOAD_    0X00100000
+#define I40E_VIRTCHNL_VF_OFFLOAD_ENCAP         0X00100000
+#define I40E_VIRTCHNL_VF_OFFLOAD_ENCAP_CSUM    0X00200000

what happens when one of the PF or VF doesn't have this hunk, e.g one
assumes value X and one assumes value Y for ENCAP_CSUM