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authorMaxim Mikityanskiy <maximmi@mellanox.com>2020-08-17 16:34:07 +0300
committerDavid S. Miller <davem@davemloft.net>2020-08-19 02:00:24 +0300
commitf01204ec8be7ea5e8f0230a7d4200e338d563bde (patch)
treefb5e16276b5e28593b6fc0890a663ab0bbeb72d0 /net/ethtool
parent2847bfed888fbb8bf4c8e8067fd6127538c2c700 (diff)
downloadlinux-f01204ec8be7ea5e8f0230a7d4200e338d563bde.tar.xz
ethtool: Don't omit the netlink reply if no features were changed
The legacy ethtool userspace tool shows an error when no features could be changed. It's useful to have a netlink reply to be able to show this error when __netdev_update_features wasn't called, for example: 1. ethtool -k eth0 large-receive-offload: off 2. ethtool -K eth0 rx-fcs on 3. ethtool -K eth0 lro on Could not change any device features rx-lro: off [requested on] 4. ethtool -K eth0 lro on # The output should be the same, but without this patch the kernel # doesn't send the reply, and ethtool is unable to detect the error. This commit makes ethtool-netlink always return a reply when requested, and it still avoids unnecessary calls to __netdev_update_features if the wanted features haven't changed. Fixes: 0980bfcd6954 ("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>
Diffstat (limited to 'net/ethtool')
-rw-r--r--net/ethtool/features.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/net/ethtool/features.c b/net/ethtool/features.c
index 6b288bfd7678..495635f152ba 100644
--- a/net/ethtool/features.c
+++ b/net/ethtool/features.c
@@ -268,14 +268,11 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT);
bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT);
- if (bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) {
- ret = 0;
- goto out_rtnl;
+ if (!bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) {
+ dev->wanted_features &= ~dev->hw_features;
+ dev->wanted_features |= ethnl_bitmap_to_features(req_wanted) & dev->hw_features;
+ __netdev_update_features(dev);
}
-
- 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);