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[Jay Vosburgh <1497812@xxxxxxxxxxxxxxxxxx>]

Just looking at the log, it might be this:

commit fa11cb3d16a9b9b296a2b811a49faf1356240348
Author: Anjali Singhai Jain <anjali.singhai@xxxxxxxxx>
Date:   Wed May 27 12:06:14 2015 -0400

    i40e: Make sure to be in VEB mode if SRIOV is enabled at probe
    
    If SRIOV is enabled we need to be in VEB mode not VEPA mode at probe.
    This fixes an NPAR bug when SRIOV is enabled in the BIOS.
    
    Change-ID: Ibf006abafd9a0ca3698ec24848cd771cf345cbbc
    Signed-off-by: Anjali Singhai Jain <anjali.singhai@xxxxxxxxx>
    Tested-by: Jim Young <james.m.young@xxxxxxxxx>
    Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>

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https://bugs.launchpad.net/bugs/1497812

Title:
  i40e bug: non physical MAC outbound frames appear as copied back
  inbound  (mirrored)

Status in linux package in Ubuntu:
  Triaged
Status in linux-lts-vivid package in Ubuntu:
  Confirmed

Bug description:
  Using 3.19.0-28-generic #30~14.04.1-Ubuntu with stock i40e
  driver version 2.2.2-k makes every 'non physical' MAC output
  frame appear as copied back at input, as if the switch was
  doing frame 'mirroring' (and/or hair-pinning).

  FYI same setup, with i40e upgraded to 1.2.48 from
  http://downloadmirror.intel.com/25282/eng/i40e-1.2.48.tar.gz
  behaves OK, fyi also we did a port mirroring setup at
  the switch directed to a different physical port for debugging,
  and didn't observe these frames to be physically present.

  See tcpdump -P in/out and more details at
  http://paste.ubuntu.com/12511680/

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-28-generic 3.19.0-28.30~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-28.30~14.04.1-generic 3.19.8-ckt5
  Uname: Linux 3.19.0-28-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  Date: Mon Sep 21 02:05:28 2015
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)

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