Merge branch 'vdpa' into next

Parav Pandit  says:

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

Linux vdpa interface allows vdpa device management functionality.
This includes adding, removing, querying vdpa devices.

vdpa interface also includes showing supported management devices
which support such operations.

This patchset includes kernel uapi headers and a vdpa tool.

examples:

$ vdpa mgmtdev show
vdpasim:
  supported_classes net

$ vdpa mgmtdev show -jp
{
    "show": {
        "vdpasim": {
            "supported_classes": [ "net" ]
        }
    }
}

Create a vdpa device of type networking named as "foo2" from
the management device vdpasim_net:

$ vdpa dev add mgmtdev vdpasim_net name foo2

Show the newly created vdpa device by its name:
$ vdpa dev show foo2
foo2: type network mgmtdev vdpasim_net vendor_id 0 max_vqs 2 max_vq_size 25=
6

$ vdpa dev show foo2 -jp
{
    "dev": {
        "foo2": {
            "type": "network",
            "mgmtdev": "vdpasim_net",
            "vendor_id": 0,
            "max_vqs": 2,
            "max_vq_size": 256
        }
    }
}

Delete the vdpa device after its use:
$ vdpa dev del foo2

An example of PCI PF, VF and SF management device:
pci/0000:03.00:0
  supported_classes
    net
pci/0000:03.00:4
  supported_classes
    net
auxiliary/mlx5_core.sf.8
  supported_classes
    net

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

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