Add loopback_nsim.py with netdevsim-specific tests for MAC loopback
via the new ethtool_ops loopback callbacks:
- test_get_mac_entry: verify MAC entry appears in dump with correct
component, name, and supported directions
- test_set_mac_local: SET local, verify via GET and debugfs
- test_set_mac_disable: enable then disable
- test_set_mac_unknown_name: SET with wrong name, expect EOPNOTSUPP
Signed-off-by: Björn Töpel <bjorn@kernel.org>
---
.../testing/selftests/drivers/net/hw/Makefile | 1 +
.../selftests/drivers/net/hw/loopback_nsim.py | 138 ++++++++++++++++++
2 files changed, 139 insertions(+)
create mode 100755 tools/testing/selftests/drivers/net/hw/loopback_nsim.py
diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
index 5a6037a71f8f..74b0e1937980 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -33,6 +33,7 @@ TEST_PROGS = \
irq.py \
loopback.sh \
loopback_drv.py \
+ loopback_nsim.py \
nic_timestamp.py \
nk_netns.py \
pp_alloc_fail.py \
diff --git a/tools/testing/selftests/drivers/net/hw/loopback_nsim.py b/tools/testing/selftests/drivers/net/hw/loopback_nsim.py
new file mode 100755
index 000000000000..d05be09f6c14
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/loopback_nsim.py
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+"""Netdevsim-specific tests for MAC loopback via ethtool_ops.
+
+Verifies that MAC loopback entries appear in dumps, that SET
+operations update state correctly (both via GET and debugfs).
+"""
+
+import errno
+import os
+
+from lib.py import ksft_run, ksft_exit, ksft_eq
+from lib.py import KsftFailEx, ksft_disruptive
+from lib.py import EthtoolFamily, NlError
+from lib.py import NetDrvEnv, ip, defer
+
+# Direction flags as YNL returns them
+DIR_NONE = set()
+DIR_LOCAL = {'local'}
+DIR_REMOTE = {'remote'}
+
+
+def _nsim_dfs_path(cfg):
+ return cfg._ns.nsims[0].dfs_dir # pylint: disable=protected-access
+
+
+def _dfs_read_u32(cfg, path):
+ with open(os.path.join(_nsim_dfs_path(cfg), path),
+ encoding="utf-8") as f:
+ return int(f.read().strip())
+
+
+def _dfs_write_u32(cfg, path, val):
+ with open(os.path.join(_nsim_dfs_path(cfg), path), "w",
+ encoding="utf-8") as f:
+ f.write(str(val))
+
+
+def _get_loopback(cfg):
+ results = cfg.ethnl.loopback_get({
+ 'header': {'dev-index': cfg.ifindex}
+ }, dump=True)
+ entries = []
+ for msg in results:
+ if 'entry' in msg:
+ entries.extend(msg['entry'])
+ return entries
+
+
+def _set_loopback(cfg, component, name, direction):
+ cfg.ethnl.loopback_set({
+ 'header': {'dev-index': cfg.ifindex},
+ 'entry': [{
+ 'component': component,
+ 'name': name,
+ 'direction': direction,
+ }]
+ })
+
+
+def test_get_mac_entry(cfg):
+ """GET should return the MAC loopback entry with correct attributes."""
+ entries = _get_loopback(cfg)
+ mac_entries = [e for e in entries if e['component'] == 'mac']
+
+ ksft_eq(len(mac_entries), 1, "Expected 1 MAC loopback entry")
+ ksft_eq(mac_entries[0]['name'], 'mac')
+ ksft_eq(mac_entries[0]['supported'], DIR_LOCAL | DIR_REMOTE)
+ ksft_eq(mac_entries[0]['direction'], DIR_NONE)
+
+
+@ksft_disruptive
+def test_set_mac_local(cfg):
+ """SET MAC local loopback and verify via GET and debugfs."""
+ ip(f"link set dev {cfg.ifname} down")
+ defer(ip, f"link set dev {cfg.ifname} up")
+
+ _set_loopback(cfg, 'mac', 'mac', 'local')
+ defer(_set_loopback, cfg, 'mac', 'mac', 0)
+
+ entries = _get_loopback(cfg)
+ mac = [e for e in entries if e['component'] == 'mac']
+ ksft_eq(mac[0]['direction'], DIR_LOCAL)
+
+ dfs_dir = _dfs_read_u32(cfg, "ethtool/mac_lb/direction")
+ ksft_eq(dfs_dir, 1, "debugfs direction should be 1 (LOCAL)")
+
+
+@ksft_disruptive
+def test_set_mac_disable(cfg):
+ """Enable then disable MAC loopback."""
+ ip(f"link set dev {cfg.ifname} down")
+ defer(ip, f"link set dev {cfg.ifname} up")
+
+ _set_loopback(cfg, 'mac', 'mac', 'local')
+ defer(_set_loopback, cfg, 'mac', 'mac', 0)
+
+ _set_loopback(cfg, 'mac', 'mac', 0)
+
+ entries = _get_loopback(cfg)
+ mac = [e for e in entries if e['component'] == 'mac']
+ ksft_eq(mac[0]['direction'], DIR_NONE, "Direction should be off")
+
+ dfs_dir = _dfs_read_u32(cfg, "ethtool/mac_lb/direction")
+ ksft_eq(dfs_dir, 0, "debugfs direction should be 0")
+
+
+@ksft_disruptive
+def test_set_mac_unknown_name(cfg):
+ """SET with unknown name should fail with EOPNOTSUPP."""
+ ip(f"link set dev {cfg.ifname} down")
+ defer(ip, f"link set dev {cfg.ifname} up")
+
+ try:
+ _set_loopback(cfg, 'mac', 'bogus', 'local')
+ raise KsftFailEx("Should have rejected unknown name")
+ except NlError as e:
+ ksft_eq(e.error, errno.EOPNOTSUPP,
+ "Expected EOPNOTSUPP for unknown name")
+
+
+def main() -> None:
+ """Run netdevsim loopback tests."""
+ with NetDrvEnv(__file__) as cfg:
+ cfg.ethnl = EthtoolFamily()
+
+ ksft_run([
+ test_get_mac_entry,
+ test_set_mac_local,
+ test_set_mac_disable,
+ test_set_mac_unknown_name,
+ ], args=(cfg, ))
+ ksft_exit()
+
+
+if __name__ == "__main__":
+ main()
--
2.53.0