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Date:   Tue, 15 Nov 2016 11:20:02 +0100
From:   "Allan W. Nielsen" <>
To:     <>
CC:     <>, <>,
        Raju Lakkaraju <>
Subject: [PATCH net-next v3 3/5] ethtool: (uapi) Add ETHTOOL_PHY_DOWNSHIFT to PHY tunables

From: Raju Lakkaraju <>

For operation in cabling environments that are incompatible with
1000BASE-T, PHY device may provide an automatic link speed downshift
operation. When enabled, the device automatically changes its 1000BASE-T
auto-negotiation to the next slower speed after a configured number of
failed attempts at 1000BASE-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 <>
Signed-off-by: Allan W. Nielsen <>
 include/uapi/linux/ethtool.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 42f696f..f0db778 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -248,9 +248,12 @@ struct ethtool_tunable {
 	void	*data[0];
 enum phy_tunable_id {
 	 * Add your fresh new phy tunable attribute above and remember to update
 	 * phy_tunable_strings[] in net/core/ethtool.c

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