Returns the capabilities and limitations of the underlying SCSI HBA. The most important information is returned in the MaximumTransferLength and AlignmentMask members. Class drivers and users of IOCTL_SCSI_PASS_THROUGH and IOCTL_SCSI_PASS_THROUGH_DIRECT are required to honor these limitations.
Only legacy drivers can issue this request. The request fails if it is sent to a PDO created by the port driver.
To get SCSI capabilities data, a Plug and Play driver must issue an IOCTL_STORAGE_QUERY_PROPERTY request for STORAGE_ADAPTER_DESCRIPTOR data to the PDO for each device to which the driver has been added (that is, each device for which the driver has received an AddDevice call). A legacy driver should forward this request to the port driver. This request fails if it is sent to the FDO for an adapter.
Input Buffer Length
Updated IO_SCSI_CAPABILITIES information is returned to the buffer at Irp->AssociatedIrp.SystemBuffer.
Output Buffer Length
Parameters.DeviceIoControl.OutputBufferLength in the I/O stack location indicates the size, in bytes, of the buffer, which must be >= sizeof(IO_SCSI_CAPABILITIES).
The Information field contains the number of bytes returned in the output buffer. The Status field indicates the results of the operation.
|Header||ntddscsi.h (include Ntddscsi.h)|