Known issues with the platform (KVM/libvirt/kernel)
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  ~ libvirt direct-bridged mode on-top of a VF is not supported. Please use
    libvirt direct-bridged mode over a PF or direct-passthrough mode with VFs.
Issue 46876:
  ~ Multicast does not work in libvirt direct-passthrough mode.
    This is because the multicast address list is not propagated to the network
    interface below the macvtap driver. Without this the sfc.ko/sfc_ef100.ko
    driver is unable to program the adapter switch to efficiently replicate
    multicast traffic to only the subscribed functions. Solarflare will work
    with upstream to find a solution to this issue.
Issue 47742:
  ~ IPv6 traffic does not pass in direct-bridged and direct-passthrough modes.
    In direct-passthrough mode multicast neighbour solicitation fails as per the
    previous point.
    In direct-bridged mode this is because an interface calculates an IPv6 link
    address based on its MAC address. There will be a neighbour solicitation
    multicast filter in the host, but when a global address is assigned in the
    VM guest, a multicast filter corresponding to the new global address is not
    inserted in the host because macvtap doesn't propagate this information.
Issue 46948:
  ~ The macvtap driver does not propagate the link state from the real network
    interface. This means that it is not possible to use bonded interfaces that
    use link state detection (miimon). Instead please use ARP probes. This
    affects libvirt direct-bridged and direct-passthrough modes.
Issue 47490:
  ~ Bad interactions can occur with NetworkManager scripts when it sees
    new VFs with random MAC addresses. Alternatively use the older networking
    service/scripts.
Issue 50308:
  ~ For RHEL 7.0 disabling GRO after passing traffic is unsafe, and can lead to
    a kernel NULL pointer deference. This is believed to be addressed by Redhat
    in RHEL 7.1. This will only happen when LRO is also disabled. For
    configurations that disable GRO and LRO, please disable GRO after the driver
    is loaded, but before the interface is brought up.
Issue 50873:
  ~ Changing the MTU across the page size (4K for x86) on a network team in
    RHEL 7.0 can cause a hang. As a workaround please change the MTU of the
    component interfaces of the team before creating it. This is fixed in
    RHEL 7.1
