[LU-17230] socklnd: treat UNKNOWN netif operational state as UP rather than DOWN

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Labels: lnet lnet-health socklnd
• Severity: 3
• Assignee: Serguei Smirnov
• Reporter: Serguei Smirnov

Description

"UNKNOWN" (IF_OPER_UNKNOWN) operational state doesn't necessarily mean that the interface can't be used and may be the result of particular network driver not providing UP/DOWN states, so it may be incorrect for socklnd to initiate setting of a "fatal error" flag on a NI using an interface in "UNKNOWN" operstate.