Is our resource static or dynamic? When working with the Storport model, we develop a driver that interfaces to the Storport driver Storport. This field indicates the Storport that it must behave differently for this device. ScsiRestartAdapter – this operations is requested when Storport wants to reinitialize the virtual adapter. Are the resources that we’re exporting accessible locally or remotely? Thus, it’s important that we do not zero it. If the request can be processed asynchronously, then our driver has to provide the means for this to be accomplished.
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How are we going to process the requests we receive? Do you find anything missing?
ScsiStopAdapter – this operation is requested when Storport wants to shutdown the virtual adapter. Possible values are 0 byte aligned1 word aligned3 long aligned and 7 longlong aligned. This structure exports the entry points that our miniport supports and provides some initialization data that Storport needs in order to understand our virtual adapter.
Static or Dynamic How a resource becomes accessible to Storport is worthy of discussion. When the SRB svsiport eventually completed by our miniport?
The NT Insider:Writing a Virtual Storport Miniport Driver
All this really means is that we either have to use system work items, or create our own worker threads to provide the background processing and this probably implies that some queuing is involved.
Mimiport, again, the operations we perform depend upon the device that our driver exports. So we have to make sure that the operations we need to be performed can be performed at that IRQL, or there is some way that we can process the request later on at some lower IRQL. Summary Storport is a welcome relief to storage driver writers wishing minkport write a miniport for a virtual adapter.
SCSI Miniport Drivers
There are 2 types of devices, static devices and dynamic devices. If the SRB is not completed in the specified time, the request will be completed by Storport and the logical unit, target, and bus will be reset.
It contains an operation code, buffers and parameters that describe the request. In addition, the miniport driver would not have to synchronize the execution of its HwStartIo and interrupt service routines which a virtual Storport miniport would not have in the first place.
Dma32BitAddresses – This field has no meaning for a virtual Storport miniport.
This can sometimes be a miniporrt for users who implement ScsiPassThrough, due to the fact that their requests will fail if the input buffers are not correctly aligned. When working with the Storport model, we develop a driver that interfaces to the Storport driver Storport.
Getting Started with Storport For those of you who have never worked with Storport before let’s go over some basics. Please find links to each article in the series here: As for what we do in this routine, it again depends upon the architecture of our miniport.
What it means is that minipor miniport has accepted the SRB for processing.
SCSI Port’s Interface with SCSI Port Miniport Drivers
All our miniport needs to do is fill in the fields that the driver wants to use. While for some there may be some work involved, for others, this routine could merely notify Storport that the bus reset completed successfully.
And this makes sense, given that that’s no interrupt object and that a driver for a virtual adapter doesn’t really have a DIRQL. Once that is done, Storport interacts with our miniport exclusively via the routines that we’ve defined in the structure. MaximumTransferLength – this field is set by the miniport to indicate the maximum number of bytes that our virtual adapter can transfer in a single operation.
HBA FCA – Driver a10 – Hewlett Packard Enterprise Community
Dma64BitAddresses – this field has no meaning for a virtual Storport miniport. For those of you who have never worked with Storport before let’s go over some basics.
AdapterInterfaceType – this indicates to Storport the bus that the miniport’s virtual adapter resides on.
HwResetBus This routine is called by Storport to clear any error conditions that exist on the bus. Processing Requests As with any other type of kernel driver, we need to be concerned about how we handle requests.
In fact, if we wanted to, there would be no reason why we couldn’t communicate with a user mode service or some other driver on the system to provide access to our storage.
This is used by the miniport as storage for driver-defined adapter information. As a virtual Storport miniport our driver is required to support 5 entry points which are: