linux-kernel - [PATCH v2 net] ethtool: netlink: add missing netdev_features

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Message-ID: <ahA2YWXYICz5rbUSQqNG4roJ8OlJzzYQX7PTiG80@cp4-web-028.plabs.ch>
Date:   Sun, 08 Nov 2020 00:46:15 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Michal Kubecek <mkubecek@...e.cz>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Alexander Lobakin <alobakin@...me>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 net] ethtool: netlink: add missing netdev_features_change() call

After updating userspace Ethtool from 5.7 to 5.9, I noticed that
NETDEV_FEAT_CHANGE is no more raised when changing netdev features
through Ethtool.
That's because the old Ethtool ioctl interface always calls
netdev_features_change() at the end of user request processing to
inform the kernel that our netdevice has some features changed, but
the new Netlink interface does not. Instead, it just notifies itself
with ETHTOOL_MSG_FEATURES_NTF.
Replace this ethtool_notify() call with netdev_features_change(), so
the kernel will be aware of any features changes, just like in case
with the ioctl interface. This does not omit Ethtool notifications,
as Ethtool itself listens to NETDEV_FEAT_CHANGE and drops
ETHTOOL_MSG_FEATURES_NTF on it
(net/ethtool/netlink.c:ethnl_netdev_event()).

>From v1 [1]:
- dropped extra new line as advised by Jakub;
- no functional changes.

[1] https://lore.kernel.org/netdev/AlZXQ2o5uuTVHCfNGOiGgJ8vJ3KgO5YIWAnQjH0cDE@cp3-web-009.plabs.ch

Fixes: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request")
Signed-off-by: Alexander Lobakin <alobakin@...me>
---
 net/ethtool/features.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ethtool/features.c b/net/ethtool/features.c
index 8ee4cdbd6b82..1c9f4df273bd 100644
--- a/net/ethtool/features.c
+++ b/net/ethtool/features.c
@@ -280,7 +280,7 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
 					  active_diff_mask, compact);
 	}
 	if (mod)
-		ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
+		netdev_features_change(dev);

 out_rtnl:
 	rtnl_unlock();
-- 
2.29.2