bnxt_en: Refactor NRZ/PAM4 link speed related logic

Refactor some NRZ/PAM4 link speed related logic into helper functions.
The NRZ and PAM4 link parameters are stored in separate structure fields.
The driver logic has to check whether it is in NRZ or PAM4 mode and
then use the appropriate field.

Refactor this logic into helper functions for better readability.
Reviewed-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -2129,6 +2129,48 @@ static u16 bnxt_agg_ring_id_to_grp_idx(struct bnxt *bp, u16 ring_id)
 	return INVALID_HW_RING_ID;
 }
 
+static u16 bnxt_get_force_speed(struct bnxt_link_info *link_info)
+{
+	if (link_info->req_signal_mode == BNXT_SIG_MODE_PAM4)
+		return link_info->force_pam4_link_speed;
+	return link_info->force_link_speed;
+}
+
+static void bnxt_set_force_speed(struct bnxt_link_info *link_info)
+{
+	link_info->req_link_speed = link_info->force_link_speed;
+	link_info->req_signal_mode = BNXT_SIG_MODE_NRZ;
+	if (link_info->force_pam4_link_speed) {
+		link_info->req_link_speed = link_info->force_pam4_link_speed;
+		link_info->req_signal_mode = BNXT_SIG_MODE_PAM4;
+	}
+}
+
+static void bnxt_set_auto_speed(struct bnxt_link_info *link_info)
+{
+	link_info->advertising = link_info->auto_link_speeds;
+	link_info->advertising_pam4 = link_info->auto_pam4_link_speeds;
+}
+
+static bool bnxt_force_speed_updated(struct bnxt_link_info *link_info)
+{
+	if (link_info->req_signal_mode == BNXT_SIG_MODE_NRZ &&
+	    link_info->req_link_speed != link_info->force_link_speed)
+		return true;
+	if (link_info->req_signal_mode == BNXT_SIG_MODE_PAM4 &&
+	    link_info->req_link_speed != link_info->force_pam4_link_speed)
+		return true;
+	return false;
+}
+
+static bool bnxt_auto_speed_updated(struct bnxt_link_info *link_info)
+{
+	if (link_info->advertising != link_info->auto_link_speeds ||
+	    link_info->advertising_pam4 != link_info->auto_pam4_link_speeds)
+		return true;
+	return false;
+}
+
 #define BNXT_EVENT_THERMAL_CURRENT_TEMP(data2)				\
 	((data2) &							\
 	  ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA2_CURRENT_TEMP_MASK)
@@ -2255,7 +2297,7 @@ static int bnxt_async_event_process(struct bnxt *bp,
 		/* print unsupported speed warning in forced speed mode only */
 		if (!(link_info->autoneg & BNXT_AUTONEG_SPEED) &&
 		    (data1 & 0x20000)) {
-			u16 fw_speed = link_info->force_link_speed;
+			u16 fw_speed = bnxt_get_force_speed(link_info);
 			u32 speed = bnxt_fw_to_ethtool_speed(fw_speed);
 
 			if (speed != SPEED_UNKNOWN)
@@ -9689,13 +9731,31 @@ static bool bnxt_support_dropped(u16 advertising, u16 supported)
 	return ((supported | diff) != supported);
 }
 
+static bool bnxt_support_speed_dropped(struct bnxt_link_info *link_info)
+{
+	/* Check if any advertised speeds are no longer supported. The caller
+	 * holds the link_lock mutex, so we can modify link_info settings.
+	 */
+	if (bnxt_support_dropped(link_info->advertising,
+				 link_info->support_auto_speeds)) {
+		link_info->advertising = link_info->support_auto_speeds;
+		return true;
+	}
+	if (bnxt_support_dropped(link_info->advertising_pam4,
+				 link_info->support_pam4_auto_speeds)) {
+		link_info->advertising_pam4 = link_info->support_pam4_auto_speeds;
+		return true;
+	}
+	return false;
+}
+
 int bnxt_update_link(struct bnxt *bp, bool chng_link_state)
 {
 	struct bnxt_link_info *link_info = &bp->link_info;
 	struct hwrm_port_phy_qcfg_output *resp;
 	struct hwrm_port_phy_qcfg_input *req;
 	u8 link_state = link_info->link_state;
-	bool support_changed = false;
+	bool support_changed;
 	int rc;
 
 	rc = hwrm_req_init(bp, req, HWRM_PORT_PHY_QCFG);
@@ -9809,19 +9869,7 @@ int bnxt_update_link(struct bnxt *bp, bool chng_link_state)
 	if (!BNXT_PHY_CFG_ABLE(bp))
 		return 0;
 
-	/* Check if any advertised speeds are no longer supported. The caller
-	 * holds the link_lock mutex, so we can modify link_info settings.
-	 */
-	if (bnxt_support_dropped(link_info->advertising,
-				 link_info->support_auto_speeds)) {
-		link_info->advertising = link_info->support_auto_speeds;
-		support_changed = true;
-	}
-	if (bnxt_support_dropped(link_info->advertising_pam4,
-				 link_info->support_pam4_auto_speeds)) {
-		link_info->advertising_pam4 = link_info->support_pam4_auto_speeds;
-		support_changed = true;
-	}
+	support_changed = bnxt_support_speed_dropped(link_info);
 	if (support_changed && (link_info->autoneg & BNXT_AUTONEG_SPEED))
 		bnxt_hwrm_set_link_setting(bp, true, false);
 	return 0;
@@ -10362,19 +10410,14 @@ static int bnxt_update_phy_setting(struct bnxt *bp)
 	if (!(link_info->autoneg & BNXT_AUTONEG_SPEED)) {
 		if (BNXT_AUTO_MODE(link_info->auto_mode))
 			update_link = true;
-		if (link_info->req_signal_mode == BNXT_SIG_MODE_NRZ &&
-		    link_info->req_link_speed != link_info->force_link_speed)
-			update_link = true;
-		else if (link_info->req_signal_mode == BNXT_SIG_MODE_PAM4 &&
-			 link_info->req_link_speed != link_info->force_pam4_link_speed)
+		if (bnxt_force_speed_updated(link_info))
 			update_link = true;
 		if (link_info->req_duplex != link_info->duplex_setting)
 			update_link = true;
 	} else {
 		if (link_info->auto_mode == BNXT_LINK_AUTO_NONE)
 			update_link = true;
-		if (link_info->advertising != link_info->auto_link_speeds ||
-		    link_info->advertising_pam4 != link_info->auto_pam4_link_speeds)
+		if (bnxt_auto_speed_updated(link_info))
 			update_link = true;
 	}
 
@@ -11992,16 +12035,9 @@ static void bnxt_init_ethtool_link_settings(struct bnxt *bp)
 		} else {
 			link_info->autoneg |= BNXT_AUTONEG_FLOW_CTRL;
 		}
-		link_info->advertising = link_info->auto_link_speeds;
-		link_info->advertising_pam4 = link_info->auto_pam4_link_speeds;
+		bnxt_set_auto_speed(link_info);
 	} else {
-		link_info->req_link_speed = link_info->force_link_speed;
-		link_info->req_signal_mode = BNXT_SIG_MODE_NRZ;
-		if (link_info->force_pam4_link_speed) {
-			link_info->req_link_speed =
-				link_info->force_pam4_link_speed;
-			link_info->req_signal_mode = BNXT_SIG_MODE_PAM4;
-		}
+		bnxt_set_force_speed(link_info);
 		link_info->req_duplex = link_info->duplex_setting;
 	}
 	if (link_info->autoneg & BNXT_AUTONEG_FLOW_CTRL)