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# SPDX-License-Identifier: GPL-2.0
"""
Netdev feature helper utilities for kernel selftests.
Provides common operations for changing device features via ethtool.
"""
from . import KsftXfailEx, defer, ethtool, ksft_pr
def set_ethtool_feat(dev, current, feats, host=None, check=True):
"""Set ethtool features with defer to restore original state."""
s2n = {True: "on", False: "off"}
new = ["-K", dev]
old = ["-K", dev]
no_change = True
for name, state in feats.items():
new += [name, s2n[state]]
old += [name, s2n[current[name]["active"]]]
if current[name]["active"] != state:
no_change = False
if current[name]["fixed"]:
raise KsftXfailEx(f"Device does not support {name}")
if no_change:
return
eth_cmd = ethtool(" ".join(new), host=host)
defer(ethtool, " ".join(old), host=host)
# If ethtool printed something kernel must have modified some features
if eth_cmd.stdout:
ksft_pr(eth_cmd)
if not check:
return
current = ethtool(f"-k {dev}", json=True, host=host)[0]
for name, state in feats.items():
if current[name]["active"] != state:
raise KsftXfailEx(f"{name} was not set to {s2n[state]}")
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