On 2026-02-01 09:24, Jakub Kicinski wrote:

On Thu, 29 Jan 2026 23:28:30 +0100 Daniel Borkmann wrote:

quoted

Add two tests using NetDrvContEnv. One basic test that sets up a netkit
pair, with one end in a netns. Use LOCAL_PREFIX_V6 and nk_forward BPF
program to ping from a remote host to the netkit in netns.

Second is a selftest for netkit queue leasing, using io_uring zero copy
test binary inside of a netns with netkit. This checks that memory
providers can be bound against virtual queues in a netkit within a
netns that are leasing from a physical netdev in the default netns.

We should cover the uAPI and the tricky part of the handling please.

So off the top of my head main bits:
  - the expected attributes on lessor and lessee via Netlink
  - destroying the netkit with MP attached
    - checking the state via YNL,
    - attaching MP from the main dev to make sure we didn't leave
      anything behind
  - destroying phys dev while netkit exists (prolly netdevsim :S)
  - making sure XDP can't be attached on phys dev when MP is installed
    via netkit

... whatever else you found to be tricky in the implementation.

Sounds good. I'll add these test cases and more.