How do I find module implementing a net interface, when there is no
ls /sys/class/net/eth0/ addr_assign_type carrier iflink speed addr_len dev_id link_mode statistics/ address dormant mtu subsystem@ brforward duplex netdev_group tx_queue_len bridge/ flags operstate type brif/ ifalias power/ uevent broadcast ifindex queues/
dev_id seems promising at first but the
eth0 is the same as for
lo, the loopback interface.
The "linux" I'm dealing with seems modern enough (having a 3.3.x kernel) but it doesn't align in this particular detail with the descriptions I've seen, which apparently support things like
lspci and other handy but rarely-used utilities.
I've read this popular, related question but its answer relies on the device symlink which the system in question doesn't have.