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An InfiniBand network address is 20 bytes long. Only the least significant 8 bytes can be interpreted as a persistent hardware unit identifier; the other 12 are transiently derived at runtime from metadata specific to the protocol stack. However, since the network interface name length is hard-capped by IFNAMSIZ at 16 chars and the 2-byte type prefix with '\0' at the end leave us only at 13, we cannot squeeze a descriptive representation of a HW address into an interface name. Thus, it makes the most sense to drop the scheme for IPoIB interfaces entirely. Currently udev just gets confused and does what it has been taught to do: fetches the first six bytes and puts them into a permanent device attribute.
systemd - System and Service Manager
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