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ethtool: Account for hw_features in netlink interface

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ethtool-netlink ignores dev->hw_features and may confuse the drivers by
asking them to enable features not in the hw_features bitmask. For
example:

1. ethtool -k eth0
   tls-hw-tx-offload: off [fixed]
2. ethtool -K eth0 tls-hw-tx-offload on
   tls-hw-tx-offload: on
3. ethtool -k eth0
   tls-hw-tx-offload: on [fixed]

Fitler out dev->hw_features from req_wanted to fix it and to resemble
the legacy ethtool behavior.

Fixes: 0980bfcd69 ("ethtool: set netdev features with FEATURES_SET request")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maxim Mikityanskiy 2020-08-17 16:34:06 +03:00 committed by David S. Miller
parent 840110a4ea
commit 2847bfed88
1 changed files with 2 additions and 1 deletions
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3
net/ethtool/features.c
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@ -273,7 +273,8 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
goto out_rtnl;
}
dev->wanted_features = ethnl_bitmap_to_features(req_wanted);
dev->wanted_features &= ~dev->hw_features;
dev->wanted_features |= ethnl_bitmap_to_features(req_wanted) & dev->hw_features;
__netdev_update_features(dev);
ethnl_features_to_bitmap(new_active, dev->features);
mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);