[LU-19960] lnet: derive CPT locality from parent device for VLAN interfaces

• Type: Bug
• Resolution: Fixed
• Priority: Medium
• Fix Version/s: Lustre 2.18.0
• Severity: 3
• Assignee: Serguei Smirnov
• Reporter: Serguei Smirnov

Description

In multi-rail configurations using both physical and VLAN interfaces, only the rails
backed by physical devices may get selected due to missing CPT locality on the VLAN NIs.

If possible, resolve VLAN devices to their underlying physical device and derive CPT
from the parent.