net: dsa: remove legacy_pre_march2020 detection

All drivers are now updated for the March 2020 changes, and no longer
make use of the mac_pcs_get_state() or mac_an_restart() operations,
which are now NULL across all DSA drivers. All DSA drivers don't look
at speed, duplex, pause or advertisement in their phylink_mac_config()
method either.

Remove support for these operations from DSA, and stop marking DSA as
a legacy driver by default.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

include/net/dsa.h

@@ -873,8 +873,6 @@ struct dsa_switch_ops {
 	struct phylink_pcs *(*phylink_mac_select_pcs)(struct dsa_switch *ds,
 						      int port,
 						      phy_interface_t iface);
-	int	(*phylink_mac_link_state)(struct dsa_switch *ds, int port,
-					  struct phylink_link_state *state);
 	int	(*phylink_mac_prepare)(struct dsa_switch *ds, int port,
 				       unsigned int mode,
 				       phy_interface_t interface);
@@ -884,7 +882,6 @@ struct dsa_switch_ops {
 	int	(*phylink_mac_finish)(struct dsa_switch *ds, int port,
 				      unsigned int mode,
 				      phy_interface_t interface);
-	void	(*phylink_mac_an_restart)(struct dsa_switch *ds, int port);
 	void	(*phylink_mac_link_down)(struct dsa_switch *ds, int port,
 					 unsigned int mode,
 					 phy_interface_t interface);

net/dsa/port.c

@@ -1568,27 +1568,6 @@ static void dsa_port_phylink_validate(struct phylink_config *config,
 		phylink_generic_validate(config, supported, state);
 }
 
-static void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config,
-					       struct phylink_link_state *state)
-{
-	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
-	struct dsa_switch *ds = dp->ds;
-	int err;
-
-	/* Only called for inband modes */
-	if (!ds->ops->phylink_mac_link_state) {
-		state->link = 0;
-		return;
-	}
-
-	err = ds->ops->phylink_mac_link_state(ds, dp->index, state);
-	if (err < 0) {
-		dev_err(ds->dev, "p%d: phylink_mac_link_state() failed: %d\n",
-			dp->index, err);
-		state->link = 0;
-	}
-}
-
 static struct phylink_pcs *
 dsa_port_phylink_mac_select_pcs(struct phylink_config *config,
 				phy_interface_t interface)
@@ -1646,17 +1625,6 @@ static int dsa_port_phylink_mac_finish(struct phylink_config *config,
 	return err;
 }
 
-static void dsa_port_phylink_mac_an_restart(struct phylink_config *config)
-{
-	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
-	struct dsa_switch *ds = dp->ds;
-
-	if (!ds->ops->phylink_mac_an_restart)
-		return;
-
-	ds->ops->phylink_mac_an_restart(ds, dp->index);
-}
-
 static void dsa_port_phylink_mac_link_down(struct phylink_config *config,
 					   unsigned int mode,
 					   phy_interface_t interface)
@@ -1700,11 +1668,9 @@ static void dsa_port_phylink_mac_link_up(struct phylink_config *config,
 static const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
 	.validate = dsa_port_phylink_validate,
 	.mac_select_pcs = dsa_port_phylink_mac_select_pcs,
-	.mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
 	.mac_prepare = dsa_port_phylink_mac_prepare,
 	.mac_config = dsa_port_phylink_mac_config,
 	.mac_finish = dsa_port_phylink_mac_finish,
-	.mac_an_restart = dsa_port_phylink_mac_an_restart,
 	.mac_link_down = dsa_port_phylink_mac_link_down,
 	.mac_link_up = dsa_port_phylink_mac_link_up,
 };
@@ -1720,13 +1686,6 @@ int dsa_port_phylink_create(struct dsa_port *dp)
 	if (err)
 		mode = PHY_INTERFACE_MODE_NA;
 
-	/* Presence of phylink_mac_link_state or phylink_mac_an_restart is
-	 * an indicator of a legacy phylink driver.
-	 */
-	if (ds->ops->phylink_mac_link_state ||
-	    ds->ops->phylink_mac_an_restart)
-		dp->pl_config.legacy_pre_march2020 = true;
-
 	if (ds->ops->phylink_get_caps)
 		ds->ops->phylink_get_caps(ds, dp->index, &dp->pl_config);