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_near_end: SET near-end, 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 <[email protected]> --- .../testing/selftests/drivers/net/hw/Makefile | 1 + .../selftests/drivers/net/hw/loopback_nsim.py | 135 ++++++++++++++++++ 2 files changed, 136 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 1c341aaa88c6..d7041b9d7461 100644 --- a/tools/testing/selftests/drivers/net/hw/Makefile +++ b/tools/testing/selftests/drivers/net/hw/Makefile @@ -32,6 +32,7 @@ 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..5edc999d920b --- /dev/null +++ b/tools/testing/selftests/drivers/net/hw/loopback_nsim.py @@ -0,0 +1,135 @@ +#!/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 KsftSkipEx, 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_NEAR_END = {'near-end'} +DIR_FAR_END = {'far-end'} + + +def _nsim_dfs_path(cfg): + return cfg._ns.nsims[0].dfs_dir + + +def _dfs_read_u32(cfg, path): + with open(os.path.join(_nsim_dfs_path(cfg), path)) 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") 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_NEAR_END | DIR_FAR_END) + ksft_eq(mac_entries[0]['direction'], DIR_NONE) + + +@ksft_disruptive +def test_set_mac_near_end(cfg): + """SET MAC near-end 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', 'near-end') + 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_NEAR_END) + + dfs_dir = _dfs_read_u32(cfg, "ethtool/mac_lb/direction") + ksft_eq(dfs_dir, 1, "debugfs direction should be 1 (NEAR_END)") + + +@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', 'near-end') + 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', 'near-end') + 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: + with NetDrvEnv(__file__) as cfg: + cfg.ethnl = EthtoolFamily() + + ksft_run([ + test_get_mac_entry, + test_set_mac_near_end, + test_set_mac_disable, + test_set_mac_unknown_name, + ], args=(cfg, )) + ksft_exit() + + +if __name__ == "__main__": + main() -- 2.53.0
