IXGBE_VFMAILBOX_PFACK
if (vf_mailbox & IXGBE_VFMAILBOX_PFACK) {
hw->mbx.vf_mailbox &= ~IXGBE_VFMAILBOX_PFACK;
if (!ixgbe_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) {