returns the attached port number. Before calling the API, the device
should be recognized by an userspace driver I/O framework. The API
receives a pci address like "0000:01:00.0" or a virtual device name
returns the attached port number. Before calling the API, the device
should be recognized by an userspace driver I/O framework. The API
receives a pci address like "0000:01:00.0" or a virtual device name