netdev - [PATCH net-next 3/5] ethtool: (uapi) Add ETHTOOL_PHY

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Date:   Fri, 4 Nov 2016 11:35:40 +0100
From:   "Allan W. Nielsen" <allan.nielsen@...rosemi.com>
To:     <netdev@...r.kernel.org>
CC:     <andrew@...n.ch>, <f.fainelli@...il.com>,
        <raju.lakkaraju@...rosemi.com>, <allan.nielsen@...rosemi.com>,
        <cphealy@...il.com>, <robh@...nel.org>,
        "Raju Lakkaraju" <Raju.Lakkaraju@...rosemi.com>
Subject: [PATCH net-next 3/5] ethtool: (uapi) Add ETHTOOL_PHY_DOWNSHIFT to PHY tunables

From: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>

For operation in cabling environments that are incompatible with
1000BAST-T, PHY device may provide an automatic link speed downshift
operation. When enabled, the device automatically changes its 1000BAST-T
auto-negotiation to the next slower speed after a configured number of
failed attempts at 1000BAST-T.  This feature is useful in setting up in
networks using older cable installations that include only pairs A and B,
and not pairs C and D.

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
Signed-off-by: Allan W. Nielsen <allan.nielsen@...rosemi.com>
---
 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 fd0bd36..040c5b5 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -248,8 +248,12 @@ struct ethtool_tunable {
 	void	*data[0];
 };
 
+#define DOWNSHIFT_DEV_DEFAULT_COUNT	0xff
+#define DOWNSHIFT_DEV_DISABLE		0
+
 enum phy_tunable_id {
 	ETHTOOL_PHY_ID_UNSPEC,
+	ETHTOOL_PHY_DOWNSHIFT,
 };
 
 /**
-- 
2.7.3