Ran the tests on a host with netmap(4) support:
```
$ sudo kyua debug -k /usr/tests/sys/netmap/Kyuafile ctrl-api-test:main
...
==> Test #41 [legacy_regif_extra_bufs_pipe_vale] successful
Executing command: ifconfig tap3858 destroy
Test passed!
ioctl(/dev/netmap, NIOCCTRL, POOLS_INFO_GET): Device not configured
ioctl(/dev/netmap, NIOCCTRL, REGISTER): Invalid argument
ioctl(/dev/netmap, NIOCCTRL, VALE_POLLING_ENABLE): Operation not supported
ioctl(/dev/netmap, NIOCCTRL, REGISTER): Operation not supported
ioctl(/dev/netmap, NIOCCTRL, REGISTER): Message too long
ioctl(/dev/netmap, NIOCCTRL, REGISTER): Invalid argument
ioctl(/dev/netmap, NIOCCTRL, SYNC_KLOOP_START): Invalid argument
ioctl(/dev/netmap, NIOCCTRL, SYNC_KLOOP_START): Device busy
ioctl(/dev/netmap, NIOCCTRL, SYNC_KLOOP_START): Invalid argument
ctrl-api-test:main -> passed
```
TODO: run the tests on a kernel without netmap(4) support.