docs: def set_iscsi_volume(self, port_id,
                           initiator_iqn, initiator_dhcp=False,
                           initiator_ip=None, initiator_netmask=None,
                           target_dhcp=False, target_iqn=None, target_ip=None,
                           target_port=3260, target_lun=0, boot_prio=1,
                           chap_user=None, chap_secret=None,
                           mutual_chap_secret=None):
          """Set iSCSI volume information to configuration.
  
          :param port_id: Physical port ID.
          :param initiator_iqn: IQN of initiator.
          :param initiator_dhcp: True if DHCP is used in the iSCSI network.
          :param initiator_ip: IP address of initiator. None if DHCP is used.
          :param initiator_netmask: Netmask of initiator as integer. None if
                 DHCP is used.
          :param target_dhcp: True if DHCP is used for iSCSI target.
          :param target_iqn: IQN of target. None if DHCP is used.
          :param target_ip: IP address of target. None if DHCP is used.
          :param target_port: Port number of target.  None if DHCP is used.
          :param target_lun: LUN number of target. None if DHCP is used,
          :param boot_prio: Boot priority of the volume. 1 indicates the highest
              priority.
          """
  
          initiator_netmask = (_convert_netmask(initiator_netmask)
                               if initiator_netmask else None)
  
          port_handler = _parse_physical_port_id(port_id)
          iscsi_boot = _create_iscsi_boot(
              initiator_iqn,
              initiator_dhcp=initiator_dhcp,
              initiator_ip=initiator_ip,
              initiator_netmask=initiator_netmask,
              target_dhcp=target_dhcp,
              target_iqn=target_iqn,
              target_ip=target_ip,
              target_port=target_port,
              target_lun=target_lun,
              boot_prio=boot_prio,
              chap_user=chap_user,
              chap_secret=chap_secret,
              mutual_chap_secret=mutual_chap_secret)
  
          port = self._find_port(port_handler)
          if port:
              port_handler.set_iscsi_port(port, iscsi_boot)
          else:
              port = port_handler.create_iscsi_port(iscsi_boot)
              self._add_port(port_handler, port)