[PATCH net-next 11/11] selftests: drv-net: add netkit devmem tests

[Bobby Eshleman <bobbyeshleman@gmail.com>]

From: Bobby Eshleman <bobbyeshleman@meta.com>

Add nk_devmem.py with four tests for TCP devmem through a netkit device:

These tests are just duplicates of the original devmem tests, with some
adjusted parameters such as telling ncdevmem to avoid device setup
(since it only has access to netkit, not a phys device).

Each test uses NetDrvContEnv with primary_rx_redirect=True to set up the
BPF redirect program on the primary netkit interface.

Assisted-by: Claude Code:claude-sonnet-4-6
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
---
 .../testing/selftests/drivers/net/hw/nk_devmem.py  | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/tools/testing/selftests/drivers/net/hw/nk_devmem.py b/tools/testing/selftests/drivers/net/hw/nk_devmem.py
new file mode 100755
index 000000000000..c069d525798b
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/nk_devmem.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+"""Test devmem TCP with netkit."""
+
+from os import path
+from lib.py import ksft_run, ksft_exit, ksft_disruptive
+from lib.py import NetDrvContEnv
+from lib.py.devmem import setup_test, run_rx, run_tx, run_tx_chunks, run_rx_hds
+
+
+@ksft_disruptive
+def check_nk_rx(cfg) -> None:
+    run_rx(cfg)
+
+
+@ksft_disruptive
+def check_nk_tx(cfg) -> None:
+    run_tx(cfg)
+
+
+@ksft_disruptive
+def check_nk_tx_chunks(cfg) -> None:
+    run_tx_chunks(cfg)
+
+
+@ksft_disruptive
+def check_nk_rx_hds(cfg) -> None:
+    run_rx_hds(cfg)
+
+
+def main() -> None:
+    with NetDrvContEnv(__file__, rxqueues=2, primary_rx_redirect=True) as cfg:
+        setup_test(cfg, path.abspath(path.dirname(__file__) + "/ncdevmem"))
+        ksft_run([check_nk_rx, check_nk_tx, check_nk_tx_chunks, check_nk_rx_hds],
+                 args=(cfg,))
+    ksft_exit()
+
+
+if __name__ == "__main__":
+    main()

-- 
2.52.0