[PATCH net-next v5 8/8] 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, then calls a
shared run_*() helper which probes for devmem support and configures
the NIC (HDS, RSS, queue lease) before driving the test. NIC state is
restored per-test via defer() callbacks registered inside the helper.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
---
Changes in v5:
- Move require_devmem() inside test functions so ksft_run() reports it
  as a SKIP (Sashiko).
- Drop the inaccurate "mirroring the nk_qlease.py pattern" claim from
  v4 (Sashiko).

Changes in v4:
- Call configure_nic()/cleanup_nic() once around ksft_run() rather than
  relying on per-test configuration inside the run_* helpers.

Changes in v3:
- Reorder os.path expressions
- Drop @ksft_disruptive from check_nk_rx_hds to mirror the original
  check_rx_hds in devmem.py

Changes in v2:
- Add nk_devmem.py to TEST_PROGS in Makefile (Sashiko)
---
 tools/testing/selftests/drivers/net/hw/Makefile    |  1 +
 .../testing/selftests/drivers/net/hw/nk_devmem.py  | 46 ++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
index 5e49d7bffced..c7a1206880ea 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -35,6 +35,7 @@ TEST_PROGS = \
 	irq.py \
 	loopback.sh \
 	nic_timestamp.py \
+	nk_devmem.py \
 	nk_netns.py \
 	nk_qlease.py \
 	ntuple.py \
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..300ed2a70ab4
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/nk_devmem.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+"""Test devmem TCP with netkit."""
+
+import os
+from devmem_lib import setup_test, run_rx, run_tx, run_tx_chunks, run_rx_hds
+from lib.py import ksft_run, ksft_exit, ksft_disruptive
+from lib.py import NetDrvContEnv
+
+
+@ksft_disruptive
+def check_nk_rx(cfg) -> None:
+    """Run the devmem RX test through netkit."""
+    run_rx(cfg)
+
+
+@ksft_disruptive
+def check_nk_tx(cfg) -> None:
+    """Run the devmem TX test through netkit."""
+    run_tx(cfg)
+
+
+@ksft_disruptive
+def check_nk_tx_chunks(cfg) -> None:
+    """Run the devmem TX chunking test through netkit."""
+    run_tx_chunks(cfg)
+
+
+def check_nk_rx_hds(cfg) -> None:
+    """Run the HDS test through netkit."""
+    run_rx_hds(cfg)
+
+
+def main() -> None:
+    """Run the netkit devmem test cases."""
+    with NetDrvContEnv(__file__, rxqueues=2, primary_rx_redirect=True) as cfg:
+        setup_test(cfg,
+                   os.path.join(os.path.dirname(os.path.abspath(__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()

-- 
2.53.0-Meta