Merge branch 'devlink-instances' into next

Jiri Pirko  says:

====================

Print out recently added attributes that expose relationships between
devlink instances. This patchset extends the outputs by
"nested_devlink" attributes.

Examples:
$ devlink dev
pci/0000:08:00.0:
  nested_devlink:
    auxiliary/mlx5_core.eth.0
auxiliary/mlx5_core.eth.0
pci/0000:08:00.1:
  nested_devlink:
    auxiliary/mlx5_core.eth.1
auxiliary/mlx5_core.eth.1

$ devlink dev -j -p
{
    "dev": {
        "pci/0000:08:00.0": {
            "nested_devlink": {
                "auxiliary/mlx5_core.eth.0": {}
            }
        },
        "auxiliary/mlx5_core.eth.0": {},
        "pci/0000:08:00.1": {
            "nested_devlink": {
                "auxiliary/mlx5_core.eth.1": {}
            }
        },
        "auxiliary/mlx5_core.eth.1": {}
    }
}

$ devlink port add pci/0000:08:00.0 flavour pcisf pfnum 0 sfnum 106
pci/0000:08:00.0/32768: type eth netdev eth2 flavour pcisf controller 0 pfnum 0 sfnum 106 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state inactive opstate detached roce enable
$ devlink port function set pci/0000:08:00.0/32768 state active
$ devlink port show pci/0000:08:00.0/32768
pci/0000:08:00.0/32768: type eth netdev eth2 flavour pcisf controller 0 pfnum 0 sfnum 106 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state active opstate attached roce enable
      nested_devlink:
        auxiliary/mlx5_core.sf.2
$ devlink port show pci/0000:08:00.0/32768 -j -p
{
    "port": {
        "pci/0000:08:00.0/32768": {
            "type": "eth",
            "netdev": "eth2",
            "flavour": "pcisf",
            "controller": 0,
            "pfnum": 0,
            "sfnum": 106,
            "splittable": false,
            "function": {
                "hw_addr": "00:00:00:00:00:00",
                "state": "active",
                "opstate": "attached",
                "roce": "enable",
                "nested_devlink": {
                    "auxiliary/mlx5_core.sf.2": {}
                }
            }
        }
    }
}

$ devlink dev reload auxiliary/mlx5_core.sf.2 netns ns1
$ devlink port show pci/0000:08:00.0/32768
pci/0000:08:00.0/32768: type eth netdev eth2 flavour pcisf controller 0 pfnum 0 sfnum 106 splittable false
  function:
    hw_addr 00:00:00:00:00:00 state active opstate attached roce enable
      nested_devlink:
        auxiliary/mlx5_core.sf.2: netns ns1
$ devlink port show pci/0000:08:00.0/32768 -j -p
{
    "port": {
        "pci/0000:08:00.0/32768": {
            "type": "eth",
            "netdev": "eth2",
            "flavour": "pcisf",
            "controller": 0,
            "pfnum": 0,
            "sfnum": 106,
            "splittable": false,
            "function": {
                "hw_addr": "00:00:00:00:00:00",
                "state": "active",
                "opstate": "attached",
                "roce": "enable",
                "nested_devlink": {
                    "auxiliary/mlx5_core.sf.2": {
                        "netns": "ns1"
                    }
                }
            }
        }
    }
}

====================

Signed-off-by: David Ahern <dsahern@kernel.org>