[nvmewin] looking for help with IOCTL tool

[Yong Chen]

Hi, everyone,

My team is starting to work on Windows driver based on nvmewin reference driver. Thanks for sharing such excellent work.

I have a question around IOCTL: which file path should I open in order to send the call to?

The PT_IOCTL.doc in the library suggests to open file handle on \\.\ScsiN<file:///\\.\ScsiN>: before sending DeviceIoControl() down. Unfortunately, our  Windows driver never receives anything. The SPTI tool sample in WDK says ScsiN: only works when the device is unclaimed by a SCSI driver. In the case, proper PathId, TargetId, and Lun must be set in the SCSI pass thru structure, but  NVME_PASS_THROUGH_IOCTL doesn’t have these fields.

According to MSDN<http://msdn.microsoft.com/en-us/library/windows/hardware/ff556013(v=vs.85).aspx>, IOCTL send to storage class drivers are mapped to SRBs with function set to SRB_FUNCTION_EXECUTE_SCSI. If I open \\.\PhysicalDriveN<file:///\\.\PhysicalDriveN>, then I do receive SRBs with such Execute SCSI function code.  But the current driver code expects SRB_FUNCTION_IO_CONTROL.

How do you guys do it?

Many thanks in advance,

________________________________
Yong Chen
Storage Architect
华为技术有限公司 Huawei Technologies Co., Ltd
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Email: yong.sc.chen at huawei.com
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