net: phylink: strip out pre-March 2020 legacy code

Strip out all the pre-March 2020 legacy code from phylink now that the
last user of it is gone.

Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/phy/phylink.c

@@ -1198,13 +1198,6 @@ static int phylink_change_inband_advert(struct phylink *pl)
 	if (test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state))
 		return 0;
 
-	if (!pl->pcs && pl->config->legacy_pre_march2020) {
-		/* Legacy method */
-		phylink_mac_config(pl, &pl->link_config);
-		phylink_pcs_an_restart(pl);
-		return 0;
-	}
-
 	phylink_dbg(pl, "%s: mode=%s/%s adv=%*pb pause=%02x\n", __func__,
 		    phylink_an_mode_str(pl->cur_link_an_mode),
 		    phy_modes(pl->link_config.interface),
@@ -1257,9 +1250,6 @@ static void phylink_mac_pcs_get_state(struct phylink *pl,
 
 	if (pl->pcs)
 		pl->pcs->ops->pcs_get_state(pl->pcs, state);
-	else if (pl->mac_ops->mac_pcs_get_state &&
-		 pl->config->legacy_pre_march2020)
-		pl->mac_ops->mac_pcs_get_state(pl->config, state);
 	else
 		state->link = 0;
 }
@@ -1492,13 +1482,6 @@ static void phylink_resolve(struct work_struct *w)
 			}
 			phylink_major_config(pl, false, &link_state);
 			pl->link_config.interface = link_state.interface;
-		} else if (!pl->pcs && pl->config->legacy_pre_march2020) {
-			/* The interface remains unchanged, only the speed,
-			 * duplex or pause settings have changed. Call the
-			 * old mac_config() method to configure the MAC/PCS
-			 * only if we do not have a legacy MAC driver.
-			 */
-			phylink_mac_config(pl, &link_state);
 		}
 	}
 
@@ -3513,7 +3496,7 @@ static void phylink_decode_usgmii_word(struct phylink_link_state *state,
  *
  * Parse the Clause 37 or Cisco SGMII link partner negotiation word into
  * the phylink @state structure. This is suitable to be used for implementing
- * the mac_pcs_get_state() member of the struct phylink_mac_ops structure if
+ * the pcs_get_state() member of the struct phylink_pcs_ops structure if
  * accessing @bmsr and @lpa cannot be done with MDIO directly.
  */
 void phylink_mii_c22_pcs_decode_state(struct phylink_link_state *state,
@@ -3563,7 +3546,7 @@ EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_decode_state);
  * Read the MAC PCS state from the MII device configured in @config and
  * parse the Clause 37 or Cisco SGMII link partner negotiation word into
  * the phylink @state structure. This is suitable to be directly plugged
- * into the mac_pcs_get_state() member of the struct phylink_mac_ops
+ * into the pcs_get_state() member of the struct phylink_pcs_ops
  * structure.
  */
 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
@@ -3674,8 +3657,8 @@ EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_config);
  * clause 37 negotiation.
  *
  * Restart the clause 37 negotiation with the link partner. This is
- * suitable to be directly plugged into the mac_pcs_get_state() member
+ * suitable to be directly plugged into the pcs_get_state() member
- * of the struct phylink_mac_ops structure.
+ * of the struct phylink_pcs_ops structure.
  */
 void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
 {

include/linux/phylink.h

@@ -201,8 +201,6 @@ enum phylink_op_type {
  * struct phylink_config - PHYLINK configuration structure
  * @dev: a pointer to a struct device associated with the MAC
  * @type: operation type of PHYLINK instance
- * @legacy_pre_march2020: driver has not been updated for March 2020 updates
- *	(See commit 7cceb599d15d ("net: phylink: avoid mac_config calls")
  * @poll_fixed_state: if true, starts link_poll,
  *		      if MAC link is at %MLO_AN_FIXED mode.
  * @mac_managed_pm: if true, indicate the MAC driver is responsible for PHY PM.
@@ -216,7 +214,6 @@ enum phylink_op_type {
 struct phylink_config {
 	struct device *dev;
 	enum phylink_op_type type;
-	bool legacy_pre_march2020;
 	bool poll_fixed_state;
 	bool mac_managed_pm;
 	bool ovr_an_inband;
@@ -230,7 +227,6 @@ struct phylink_config {
  * struct phylink_mac_ops - MAC operations structure.
  * @validate: Validate and update the link configuration.
  * @mac_select_pcs: Select a PCS for the interface mode.
- * @mac_pcs_get_state: Read the current link state from the hardware.
  * @mac_prepare: prepare for a major reconfiguration of the interface.
  * @mac_config: configure the MAC for the selected mode and state.
  * @mac_finish: finish a major reconfiguration of the interface.
@@ -245,8 +241,6 @@ struct phylink_mac_ops {
 			 struct phylink_link_state *state);
 	struct phylink_pcs *(*mac_select_pcs)(struct phylink_config *config,
 					      phy_interface_t interface);
-	void (*mac_pcs_get_state)(struct phylink_config *config,
-				  struct phylink_link_state *state);
 	int (*mac_prepare)(struct phylink_config *config, unsigned int mode,
 			   phy_interface_t iface);
 	void (*mac_config)(struct phylink_config *config, unsigned int mode,
@@ -312,25 +306,6 @@ void validate(struct phylink_config *config, unsigned long *supported,
 struct phylink_pcs *mac_select_pcs(struct phylink_config *config,
 				   phy_interface_t interface);
 
-/**
- * mac_pcs_get_state() - Read the current inband link state from the hardware
- * @config: a pointer to a &struct phylink_config.
- * @state: a pointer to a &struct phylink_link_state.
- *
- * Read the current inband link state from the MAC PCS, reporting the
- * current speed in @state->speed, duplex mode in @state->duplex, pause
- * mode in @state->pause using the %MLO_PAUSE_RX and %MLO_PAUSE_TX bits,
- * negotiation completion state in @state->an_complete, and link up state
- * in @state->link. If possible, @state->lp_advertising should also be
- * populated.
- *
- * Note: This is a legacy method. This function will not be called unless
- * legacy_pre_march2020 is set in &struct phylink_config and there is no
- * PCS attached.
- */
-void mac_pcs_get_state(struct phylink_config *config,
-		       struct phylink_link_state *state);
-
 /**
  * mac_prepare() - prepare to change the PHY interface mode
  * @config: a pointer to a &struct phylink_config.
@@ -367,17 +342,9 @@ int mac_prepare(struct phylink_config *config, unsigned int mode,
  * guaranteed to be correct, and so any mac_config() implementation must
  * never reference these fields.
  *
- * Note: For legacy March 2020 drivers (drivers with legacy_pre_march2020 set
+ * This will only be called to reconfigure the MAC for a "major" change in
- * in their &phylnk_config and which don't have a PCS), this function will be
+ * e.g. interface mode. It will not be called for changes in speed, duplex
- * called on each link up event, and to also change the in-band advert. For
+ * or pause modes or to change the in-band advertisement.
- * non-legacy drivers, it will only be called to reconfigure the MAC for a
- * "major" change in e.g. interface mode. It will not be called for changes
- * in speed, duplex or pause modes or to change the in-band advertisement.
- * In any case, it is strongly preferred that speed, duplex and pause settings
- * are handled in the mac_link_up() method and not in this method.
- *
- * (this requires a rewrite - please refer to mac_link_up() for situations
- *  where the PCS and MAC are not tightly integrated.)
  *
  * In all negotiation modes, as defined by @mode, @state->pause indicates the
  * pause settings which should be applied as follows. If %MLO_PAUSE_AN is not
@@ -409,7 +376,7 @@ int mac_prepare(struct phylink_config *config, unsigned int mode,
  *   1000base-X or Cisco SGMII mode depending on the @state->interface
  *   mode). In both cases, link state management (whether the link
  *   is up or not) is performed by the MAC, and reported via the
- *   mac_pcs_get_state() callback. Changes in link state must be made
+ *   pcs_get_state() callback. Changes in link state must be made
  *   by calling phylink_mac_change().
  *
  *   Interface mode specific details are mentioned below.
@@ -601,8 +568,8 @@ void pcs_disable(struct phylink_pcs *pcs);
  * in @state->link. If possible, @state->lp_advertising should also be
  * populated.
  *
- * When present, this overrides mac_pcs_get_state() in &struct
+ * When present, this overrides pcs_get_state() in &struct
- * phylink_mac_ops.
+ * phylink_pcs_ops.
  */
 void pcs_get_state(struct phylink_pcs *pcs,
 		   struct phylink_link_state *state);