Expect netkit container datapath selftests to have a publicly routable
IP prefix to assign to netkit in a container, such that packets will
land on eth0. The bpf skb forward program will then forward such packets
from the host netns to the container netns.

Signed-off-by: David Wei <dw@davidwei.uk>
---
 tools/testing/selftests/drivers/net/README.rst    | 7 +++++++
 tools/testing/selftests/drivers/net/lib/py/env.py | 1 +
 2 files changed, 8 insertions(+)

diff --git a/tools/testing/selftests/drivers/net/README.rst b/tools/testing/selftests/drivers/net/README.rst
index eb838ae94844..b94e81c2e030 100644
--- a/tools/testing/selftests/drivers/net/README.rst
+++ b/tools/testing/selftests/drivers/net/README.rst
@@ -62,6 +62,13 @@ LOCAL_V4, LOCAL_V6, REMOTE_V4, REMOTE_V6
 
 Local and remote endpoint IP addresses.
 
+LOCAL_PREFIX_V4, LOCAL_PREFIX_V6
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Local IP prefix/subnet which can be used to allocate extra IP addresses (for
+network name spaces behind macvlan, veth, netkit devices). DUT must be
+reachable using these addresses from the endpoint.
+
 REMOTE_TYPE
 ~~~~~~~~~~~
 
diff --git a/tools/testing/selftests/drivers/net/lib/py/env.py b/tools/testing/selftests/drivers/net/lib/py/env.py
index 8b644fd84ff2..4004d1a3c82e 100644
--- a/tools/testing/selftests/drivers/net/lib/py/env.py
+++ b/tools/testing/selftests/drivers/net/lib/py/env.py
@@ -196,6 +196,7 @@ class NetDrvEpEnv(NetDrvEnvBase):
     def _check_env(self):
         vars_needed = [
             ["LOCAL_V4", "LOCAL_V6"],
+            ["LOCAL_PREFIX_V4", "LOCAL_PREFIX_V6"],
             ["REMOTE_V4", "REMOTE_V6"],
             ["REMOTE_TYPE"],
             ["REMOTE_ARGS"]
-- 
2.47.3