netdev - [PATCH net-next] ethtool: stats: clarify the initialization to ETHTOOL_STAT_NOT

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Date:   Mon, 19 Apr 2021 13:03:45 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, idosch@...sch.org,
        Jakub Kicinski <kuba@...nel.org>,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next] ethtool: stats: clarify the initialization to ETHTOOL_STAT_NOT_SET

Ido suggests we add a comment about the init of stats to -1.
This is unlikely to be clear to first time readers.

Suggested-by: Ido Schimmel <idosch@...dia.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 net/ethtool/stats.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ethtool/stats.c b/net/ethtool/stats.c
index acb2b080c358..b7642dc96d50 100644
--- a/net/ethtool/stats.c
+++ b/net/ethtool/stats.c
@@ -114,6 +114,9 @@ static int stats_prepare_data(const struct ethnl_req_info *req_base,
 	if (ret < 0)
 		return ret;
 
+	/* Mark all stats as unset (see ETHTOOL_STAT_NOT_SET) to prevent them
+	 * from being reported to user space in case driver did not set them.
+	 */
 	memset(&data->phy_stats, 0xff, sizeof(data->phy_stats));
 	memset(&data->mac_stats, 0xff, sizeof(data->mac_stats));
 	memset(&data->ctrl_stats, 0xff, sizeof(data->mac_stats));
-- 
2.30.2