I've got a system on which systemd is incorrectly naming plug-in PCIe network card interfaces as onboard (eg, eno33) instead of with the PCI slot number (eg, ens2f0).
Looking at the source, it looks like the network device naming will, by default, generate an onboard network name for any device that has an acpi_index in sysfs. However, acpi_index is present for any network device which has a _DSM in ACPI for naming the PCI/PCIe device (as described in section 4.6.7 of the PCI Firmware Spec v3.2)--and this _DSM is not intended to be used only for onboard network interfaces. (The implementation note for this _DSM in the firmware spec shows, as an example, what this _DSM might return for a network card plugged into a PCIe slot.)
The best solution that I've thought of so far is to make systemd prefer the naming for the slot (ID_NET_NAME_SLOT) over the naming for an onboard device (ID_NET_NAME_ONBOARD), if both exist. Does that sound like a reasonable solution?
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