mlxsw: spectrum: Add support for auto-negotiation disable mode

In 'auto-neg off' the device have sent AN (auto-negotiation) frames
with the forced speed. Thus, fix it using an_disable_admin field in
Port type and speed (PTYS) register. This field indicates if speed
negotiation frames would be send by the port or not.

Add the field and enable/disable it for 'auto-neg on/off', make the
port to start/stop sending AN (auto-negotiation) frames. Note that for
SwitchX2 the behavior doesn't change (i.e support only AN enabled with
forced speed).

Signed-off-by: Tal Bar <talb@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/reg.h

@@ -2872,6 +2872,14 @@ static inline void mlxsw_reg_pmtu_pack(char *payload, u8 local_port,
 
 MLXSW_REG_DEFINE(ptys, MLXSW_REG_PTYS_ID, MLXSW_REG_PTYS_LEN);
 
+/* an_disable_admin
+ * Auto negotiation disable administrative configuration
+ * 0 - Device doesn't support AN disable.
+ * 1 - Device supports AN disable.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, ptys, an_disable_admin, 0x00, 30, 1);
+
 /* reg_ptys_local_port
  * Local port number.
  * Access: Index
@@ -3000,12 +3008,13 @@ MLXSW_ITEM32(reg, ptys, ib_proto_oper, 0x28, 0, 16);
 MLXSW_ITEM32(reg, ptys, eth_proto_lp_advertise, 0x30, 0, 32);
 
 static inline void mlxsw_reg_ptys_eth_pack(char *payload, u8 local_port,
-					   u32 proto_admin)
+					   u32 proto_admin, bool autoneg)
 {
 	MLXSW_REG_ZERO(ptys, payload);
 	mlxsw_reg_ptys_local_port_set(payload, local_port);
 	mlxsw_reg_ptys_proto_mask_set(payload, MLXSW_REG_PTYS_PROTO_MASK_ETH);
 	mlxsw_reg_ptys_eth_proto_admin_set(payload, proto_admin);
+	mlxsw_reg_ptys_an_disable_admin_set(payload, !autoneg);
 }
 
 static inline void mlxsw_reg_ptys_eth_unpack(char *payload,

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -2390,7 +2390,7 @@ static int mlxsw_sp_port_get_link_ksettings(struct net_device *dev,
 	int err;
 
 	autoneg = mlxsw_sp_port->link.autoneg;
-	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sp_port->local_port, 0);
+	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sp_port->local_port, 0, false);
 	err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(ptys), ptys_pl);
 	if (err)
 		return err;
@@ -2424,7 +2424,7 @@ mlxsw_sp_port_set_link_ksettings(struct net_device *dev,
 	bool autoneg;
 	int err;
 
-	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sp_port->local_port, 0);
+	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sp_port->local_port, 0, false);
 	err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(ptys), ptys_pl);
 	if (err)
 		return err;
@@ -2442,7 +2442,7 @@ mlxsw_sp_port_set_link_ksettings(struct net_device *dev,
 	}
 
 	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sp_port->local_port,
-				eth_proto_new);
+				eth_proto_new, autoneg);
 	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ptys), ptys_pl);
 	if (err)
 		return err;
@@ -2653,7 +2653,7 @@ mlxsw_sp_port_speed_by_width_set(struct mlxsw_sp_port *mlxsw_sp_port, u8 width)
 
 	eth_proto_admin = mlxsw_sp_to_ptys_upper_speed(upper_speed);
 	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sp_port->local_port,
-				eth_proto_admin);
+				eth_proto_admin, mlxsw_sp_port->link.autoneg);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ptys), ptys_pl);
 }
 

drivers/net/ethernet/mellanox/mlxsw/switchx2.c

@@ -789,7 +789,7 @@ mlxsw_sx_port_get_link_ksettings(struct net_device *dev,
 	u32 supported, advertising, lp_advertising;
 	int err;
 
-	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sx_port->local_port, 0);
+	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sx_port->local_port, 0, false);
 	err = mlxsw_reg_query(mlxsw_sx->core, MLXSW_REG(ptys), ptys_pl);
 	if (err) {
 		netdev_err(dev, "Failed to get proto");
@@ -879,7 +879,7 @@ mlxsw_sx_port_set_link_ksettings(struct net_device *dev,
 		mlxsw_sx_to_ptys_advert_link(advertising) :
 		mlxsw_sx_to_ptys_speed(speed);
 
-	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sx_port->local_port, 0);
+	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sx_port->local_port, 0, false);
 	err = mlxsw_reg_query(mlxsw_sx->core, MLXSW_REG(ptys), ptys_pl);
 	if (err) {
 		netdev_err(dev, "Failed to get proto");
@@ -897,7 +897,7 @@ mlxsw_sx_port_set_link_ksettings(struct net_device *dev,
 		return 0;
 
 	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sx_port->local_port,
-				eth_proto_new);
+				eth_proto_new, true);
 	err = mlxsw_reg_write(mlxsw_sx->core, MLXSW_REG(ptys), ptys_pl);
 	if (err) {
 		netdev_err(dev, "Failed to set proto admin");
@@ -1029,7 +1029,7 @@ mlxsw_sx_port_speed_by_width_set(struct mlxsw_sx_port *mlxsw_sx_port, u8 width)
 
 	eth_proto_admin = mlxsw_sx_to_ptys_upper_speed(upper_speed);
 	mlxsw_reg_ptys_eth_pack(ptys_pl, mlxsw_sx_port->local_port,
-				eth_proto_admin);
+				eth_proto_admin, true);
 	return mlxsw_reg_write(mlxsw_sx->core, MLXSW_REG(ptys), ptys_pl);
 }