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ethtool: (uapi) Add ETHTOOL_PHY_DOWNSHIFT to PHY tunables 

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 <Raju.Lakkaraju@microsemi.com>
Signed-off-by: Allan W. Nielsen <allan.nielsen@microsemi.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Raju Lakkaraju 2016-11-17 13:07:22 +01:00 committed by David S. Miller
parent 968ad9da7e
commit 607c702914
1 changed files with 4 additions and 1 deletions
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5
include/uapi/linux/ethtool.h
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@ -248,9 +248,12 @@ struct ethtool_tunable {
void *data[0]; void *data[0];
}; };
#define DOWNSHIFT_DEV_DEFAULT_COUNT 0xff
#define DOWNSHIFT_DEV_DISABLE 0
enum phy_tunable_id { enum phy_tunable_id {
ETHTOOL_PHY_ID_UNSPEC, ETHTOOL_PHY_ID_UNSPEC,
ETHTOOL_PHY_DOWNSHIFT,
/* /*
* Add your fresh new phy tunable attribute above and remember to update * Add your fresh new phy tunable attribute above and remember to update
* phy_tunable_strings[] in net/core/ethtool.c * phy_tunable_strings[] in net/core/ethtool.c