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From: Pawel Dembicki <paweldembicki@gmail.com>
To: netdev@vger.kernel.org
Cc: Pawel Dembicki <paweldembicki@gmail.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>,
	Dimitri Fedrau <dima.fedrau@gmail.com>,
	Stefan Eichenberger <eichest@gmail.com>,
	Kory Maincent <kory.maincent@bootlin.com>,
	Maxime Chevallier <maxime.chevallier@bootlin.com>,
	Ahmed Zaki <ahmed.zaki@intel.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH net-next v3 2/3] net: ethtool: Add impedance mismatch result code to cable test
Date: Tue,  2 Apr 2024 22:11:19 +0200
Message-Id: <20240402201123.2961909-2-paweldembicki@gmail.com>
In-Reply-To: <20240402201123.2961909-1-paweldembicki@gmail.com>
References: <20240402201123.2961909-1-paweldembicki@gmail.com>
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Some PHYs can recognize during a cable test if the impedance in the cable
is okay. They can detect reflections caused by impedance discontinuity
between a regular 100 Ohm cable and an abnormal part with a higher or
lower impedance.

This commit introduces a new result code:
ETHTOOL_A_CABLE_RESULT_CODE_IMPEDANCE_MISMATCH,
which represents the results of a cable test indicating issues with
impedance integrity.

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
---
v3:
  - added enum description
  - improve commit message
v2:
  - introduce patch

 include/uapi/linux/ethtool_netlink.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 3f89074aa06c..accbb1a231df 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -515,6 +515,10 @@ enum {
 	ETHTOOL_A_CABLE_RESULT_CODE_OPEN,
 	ETHTOOL_A_CABLE_RESULT_CODE_SAME_SHORT,
 	ETHTOOL_A_CABLE_RESULT_CODE_CROSS_SHORT,
+	/* detected reflection caused by the impedance discontinuity between
+	 * a regular 100 Ohm cable and a part with the abnormal impedance value
+	 */
+	ETHTOOL_A_CABLE_RESULT_CODE_IMPEDANCE_MISMATCH,
 };
 
 enum {
-- 
2.25.1