Add IFLA_PARENT_DEV_NAME / IFLA_PARENT_DEV_BUS_NAME to links

[akerouanton]

These attributes are supported since kernel v5.14 (see 1). Here's what iproute2 shows:

$ ip -d link show eth0
4: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65535 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    ... parentbus virtio parentdev virtio0

[akerouanton]

It seems the failing test is a flake. I was able to reproduce it once out of a few runs on main.

--- FAIL: TestRuleListFiltered (1.01s)
    --- FAIL: TestRuleListFiltered/IPv6 (1.01s)
        --- FAIL: TestRuleListFiltered/IPv6/returns_one_rule_filtered_by_Dst (1.00s)

[thaJeztah]

LGTM

[aboch]

Thanks @akerouanton
Would it be possible to add a new or extend and existing UT function to cover these changes?

[akerouanton]

@aboch Testing this one is quite challenging because you need a physical interface to have a 'parent' reported, and there's no way to guarantee that the same parent will be available across CI, developers' machine, etc… or even if there'll be at least one interface with a 'parent'.

I'd need to mock the netlink response to test that, but it seems no other tests are using mocks.

[aboch]

LGTM