[ofw] [PATCH][RFC] winverbs/cq: implement CQ:Notify()

[Sean Hefty]

> static void WvCqEventHandler(ib_event_rec_t *pEvent)
> {
>-	pEvent;
>+	WV_COMPLETION_QUEUE *cq = pEvent->context;
>+	WDFREQUEST			request;
>+	NTSTATUS			status;
>+
>+	WdfObjectAcquireLock(cq->Queue);
>+	status = WdfIoQueueRetrieveNextRequest(cq->Queue, &request);
>+	WdfObjectReleaseLock(cq->Queue);
>+
>+	if (NT_SUCCESS(status)) {
>+		WdfRequestComplete(request, STATUS_UNEXPECTED_IO_ERROR);
>+	}
> }
>
> static void WvCqHandler(void *Context)
> {
>-	 WV_COMPLETION_QUEUE *pCq = Context;
>-	 pCq;
>+	WV_COMPLETION_QUEUE *cq = Context;
>+	WDFREQUEST			request;
>+	NTSTATUS			status;
>+
>+	WdfObjectAcquireLock(cq->Queue);
>+	status = WdfIoQueueRetrieveNextRequest(cq->Queue, &request);
>+	WdfObjectReleaseLock(cq->Queue);
>+
>+	if (NT_SUCCESS(status)) {
>+		WdfRequestComplete(request, STATUS_SUCCESS);
>+	}
> }

When I added support to cancel requests, I ended up with the two handlers calling into a single function.

>+	WDF_IO_QUEUE_CONFIG_INIT(&config, WdfIoQueueDispatchManual);
>+	status = WdfIoQueueCreate(ControlDevice, &config,
>+							  WDF_NO_OBJECT_ATTRIBUTES, &cq->Queue);
>+	if (!NT_SUCCESS(status)) {
>+		goto err;
>+	}

And this needed to be destroyed when freeing the CQ.

These changes and the fixes were added to the WinVerbs branch.

- Sean