From: Raju Lakkaraju <raju.lakkar...@microsemi.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.lakkar...@microsemi.com>
---
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];
};
+#define DOWNSHIFT_DEV_DEFAULT_COUNT 0xff
+#define DOWNSHIFT_DEV_DISABLE 0
+
enum phy_tunable_id {
ETHTOOL_PHY_ID_UNSPEC,
-
+ ETHTOOL_PHY_DOWNSHIFT,
/*
* Add your fresh new phy tunable attribute above and remember to update
* phy_tunable_strings[] in net/core/ethtool.c
--
2.7.3
