netdev - [PATCH net-next 1/3] ethtool: fec: add note about reuse of reserved

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Message-Id: <20210326202223.302085-2-kuba@kernel.org>
Date:   Fri, 26 Mar 2021 13:22:21 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, andrew@...n.ch, mkubecek@...e.cz,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 1/3] ethtool: fec: add note about reuse of reserved

struct ethtool_fecparam::reserved can't be used in SET, because
ethtool user space doesn't zero-initialize the structure.
Make this clear.

Suggested-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 include/uapi/linux/ethtool.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index f6ef7d42c7a1..9a47c3efd8ca 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -1382,6 +1382,10 @@ struct ethtool_per_queue_op {
  * @fec: Bitmask of configured FEC modes.
  * @reserved: Reserved for future extensions, ignore on GET, write 0 for SET.
  *
+ * Note that @reserved was never validated on input and ethtool user space
+ * left it uninitialized when calling SET. Hence going forward it can only be
+ * used to return a value to userspace with GET.
+ *
  * FEC modes supported by the device can be read via %ETHTOOL_GLINKSETTINGS.
  * FEC settings are configured by link autonegotiation whenever it's enabled.
  * With autoneg on %ETHTOOL_GFECPARAM can be used to read the current mode.
-- 
2.30.2