Set up a netkit pair, with one end in a netns. Use LOCAL_PREFIX_V6 and
nk_forward bpf prog to ping from a remote host to the netkit in netns.

Signed-off-by: David Wei <dw@davidwei.uk>
---
 .../testing/selftests/drivers/net/hw/Makefile |  1 +
 .../selftests/drivers/net/hw/nk_netns.py      | 23 +++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100755 tools/testing/selftests/drivers/net/hw/nk_netns.py

diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
index 1760238e9d4f..9a7a0d7a1b6d 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -19,6 +19,7 @@ TEST_PROGS = \
 	irq.py \
 	loopback.sh \
 	nic_timestamp.py \
+	nk_netns.py \
 	pp_alloc_fail.py \
 	rss_api.py \
 	rss_ctx.py \
diff --git a/tools/testing/selftests/drivers/net/hw/nk_netns.py b/tools/testing/selftests/drivers/net/hw/nk_netns.py
new file mode 100755
index 000000000000..afa8638195d8
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/nk_netns.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+from lib.py import ksft_run, ksft_exit
+from lib.py import NetDrvContEnv
+from lib.py import cmd
+
+
+def test_ping(cfg) -> None:
+    cfg.require_ipver("6")
+
+    cmd(f"ping -c 1 -W5 {cfg.nk_guest_ipv6}", host=cfg.remote)
+    cmd(f"ping -c 1 -W5 {cfg.remote_addr_v['6']}", ns=cfg.netns)
+
+
+def main() -> None:
+    with NetDrvContEnv(__file__) as cfg:
+        ksft_run([test_ping], args=(cfg,))
+    ksft_exit()
+
+
+if __name__ == "__main__":
+    main()
-- 
2.47.3