[nvmewin] Handling NVMe Passthrough IOCTLs

[Jeff Glass]

If he has a handle to the disk device he should be able to send
IOCTL_SCSI_GET_ADDRESS to determine the ScsiXxx name of the HBA device. 
The "PortNumber" field of the returned SCSI_ADDRESS structure is the Xxx
portion of \\.\ScsiXxx.



On 3/21/2014 1:11 PM, Robles, Raymond C wrote:
>
> Agreed with Jeff... but you will also want to make sure you are
> opening the correct ScsiXxx handle. This varies depending on the
> system. Many times it's Scsi1or Scsi2, but essentially, you'll have to
> walk through opening handles and upon opening one successfully, seeing
> the Identify succeed.
>
>  
>
> *From:*nvmewin-bounces at lists.openfabrics.org
> [mailto:nvmewin-bounces at lists.openfabrics.org] *On Behalf Of *Jeff Glass
> *Sent:* Friday, March 21, 2014 9:09 AM
> *To:* nvmewin at lists.openfabrics.org
> *Subject:* Re: [nvmewin] Handling NVMe Passthrough IOCTLs
>
>  
>
> You said "Note: I am getting proper handle from CreateFile for my NVMe
> Device."  Did you open \\.\PhysicalDriveXxxx
> <file:///%5C%5C.%5CPhysicalDriveXxxx> or \\.\ScsiXxxx
> <file:///%5C%5C.%5CScsiXxxx>?
>
> You need to open a handle to the adapter (i.e. Scsi) and not the disk
> (i.e. PhysicalDrive) for IOCTL_SCSI_MINIPORT.  That's the most common
> mistake I've seen that causes this error.
>
>
> On 3/21/201 8:57 AM, Saikrishna Ravikanti wrote:
>
>     Hi Team,
>
>      
>
>     By referring PT_IOCTL.Doc and WDK SPTI Sample, I am developing an
>     application to send IOCTLs
>
>     using _NVME_PASS_THROUGH_IOCTL structure.
>
>      
>
>     I am facing some problem.
>
>     DeviceIoControl routine returning Error code 1 (Incorrect Function).
>
>      
>
>     Code shown below :
>
>      
>
>     PNVME_PASS_THROUGH_IOCTL pInBuffer = NULL;
>
>     PNVME_PASS_THROUGH_IOCTL pOutBuffer = NULL;
>
>     ULONG   ByteSizeTX =4096;
>
>      
>
>     /* Allocate input buffer to accommodate size of
>     NVME_PASS_THRUGH_IOCTL only */
>
>     InputBufLen = sizeof(NVME_PASS_THROUGH_IOCTL);
>
>     pInBuffer = (PNVME_PASS_THROUGH_IOCTL) malloc(InputBufLen); 
>
>     /* Allocate output buffer to accommodate size of
>     NVME_PASS_THRUGH_IOCTL and data */
>
>     OutputBufLen = sizeof(NVME_PASS_THROUGH_IOCTL)+ ByteSizeTX - 1;
>
>     pOutBuffer = (PNVME_PASS_THROUGH_IOCTL) malloc(OutputBufLen); 
>
>     if (pInBuffer == NULL || pOutBuffer == NULL)
>
>     return;
>
>      
>
>                 /* Zero out the buffers */
>
>     memset(pInBuffer, 0, InputBufLen);
>
>     memset(pOutBuffer, 0, OutputBufLen);
>
>      
>
>     pInBuffer->SrbIoCtrl.HeaderLength = sizeof(SRB_IO_CONTROL);
>
>     memcpy((UCHAR*)(&pInBuffer->SrbIoCtrl.Signature[0]), NVME_SIG_STR,
>     NVME_SIG_STR_LEN);
>
>     pInBuffer->SrbIoCtrl.Timeout = NVME_PT_TIMEOUT;
>
>     pInBuffer->SrbIoCtrl.ControlCode =
>     (ULONG)NVME_PASS_THROUGH_SRB_IO_CODE;
>
>     pInBuffer->SrbIoCtrl.Length = InputBufLen - sizeof(SRB_IO_CONTROL);
>
>      
>
>     pInBuffer->NVMeCmd[0]=ADMIN_IDENTIFY;
>
>     pInBuffer->NVMeCmd[1]=0;
>
>     pInBuffer->NVMeCmd[10]= 1; //Return corresponding controller data
>     structure
>
>      
>
>     pInBuffer->DataBufferLen = 0;
>
>     pInBuffer->ReturnBufferLen = sizeof(NVME_PASS_THROUGH_IOCTL) +
>     ByteSizeTX - 1;
>
>      
>
>      status = DeviceIoControl(
>
>                               fileHandle,                           /*
>     Handle to \\.\scsi <file:///%5C%5C.%5Cscsi> device via CreateFile */
>
>                               IOCTL_SCSI_MINIPORT,   /* IO control
>     function to a miniport driver */
>
>                               pInBuffer       ,                    
>      /* Input buffer with data sent to driver */
>
>                               InputBufLen,                       /*
>     Length of data sent to driver (in bytes) */
>
>                               pOutBuffer,                  /* Output
>     buffer with data received from driver */
>
>                               OutputBufLen,                       /*
>     Length of data received from driver */
>
>                               &Count,                                
>      /* Bytes placed in DataBuffer */
>
>                               NULL);                 
>
>      
>
>     Kindly let me know your valuable inputs about this behavior.
>
>      
>
>     Note: I am getting proper handle from CreateFile for my NVMe Device.
>
>      
>
>     Regards,
>
>     Sai
>
>
>
>
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>  
>
>
>
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