net: pcs: xpcs: Add Pause Mode support for SGMII and 2500BaseX

SGMII/2500BaseX supports Pause frame as defined in the IEEE802.3x
Flow Control standardization.

Add this as a supported feature under the xpcs_sgmii_features struct.

Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Wong Vee Khee <vee.khee.wong@linux.intel.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/pcs/pcs-xpcs.c

@@ -65,6 +65,9 @@ static const int xpcs_xlgmii_features[] = {
 };
 
 static const int xpcs_sgmii_features[] = {
+	ETHTOOL_LINK_MODE_Pause_BIT,
+	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+	ETHTOOL_LINK_MODE_Autoneg_BIT,
 	ETHTOOL_LINK_MODE_10baseT_Half_BIT,
 	ETHTOOL_LINK_MODE_10baseT_Full_BIT,
 	ETHTOOL_LINK_MODE_100baseT_Half_BIT,
@@ -75,6 +78,7 @@ static const int xpcs_sgmii_features[] = {
 };
 
 static const int xpcs_2500basex_features[] = {
+	ETHTOOL_LINK_MODE_Pause_BIT,
 	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 	ETHTOOL_LINK_MODE_Autoneg_BIT,
 	ETHTOOL_LINK_MODE_2500baseX_Full_BIT,