MPxIO Path Steering

The MPxIO path steering feature includes a mechanism for issuing SCSI commands to an MPxIO LU to be delivered down a specified path to the LU. In order to provide this functionality, a new IOCTL command, MP_SEND_SCSI_CMD, is added and is referenced through the existing scsi_vhci IOCTL interface. An extension is introduced to the multipath management library (MP-API) which provides access to this new IOCTL command. This enables network administrators to run diagnostic commands through a specified path.