net: ena: Control PHC enable through devlink

Add the capability to set parameters through the devlink framework.

The parameter used for controlling PHC (enable/disable) details
are as follows:
- Name: enable_phc
- Type: Boolean (true - enable/false - disable)
- Mode: DEVLINK_PARAM_CMODE_DRIVERINIT
- Effect: Changes take place during driver initialization,
          any changes require a devlink reload to take effect.

Signed-off-by: David Arinzon <darinzon@amazon.com>
Link: https://patch.msgid.link/20250617110545.5659-7-darinzon@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/amazon/ena/ena_devlink.c

@@ -5,6 +5,59 @@
 
 #include "linux/pci.h"
 #include "ena_devlink.h"
+#include "ena_phc.h"
+
+static int ena_devlink_enable_phc_validate(struct devlink *devlink, u32 id,
+					   union devlink_param_value val,
+					   struct netlink_ext_ack *extack)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+
+	if (!val.vbool)
+		return 0;
+
+	if (!ena_com_phc_supported(adapter->ena_dev)) {
+		NL_SET_ERR_MSG_MOD(extack, "Device doesn't support PHC");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static const struct devlink_param ena_devlink_params[] = {
+	DEVLINK_PARAM_GENERIC(ENABLE_PHC,
+			      BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
+			      NULL,
+			      NULL,
+			      ena_devlink_enable_phc_validate),
+};
+
+void ena_devlink_params_get(struct devlink *devlink)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+	union devlink_param_value val;
+	int err;
+
+	err = devl_param_driverinit_value_get(devlink,
+					      DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
+					      &val);
+	if (err) {
+		netdev_err(adapter->netdev, "Failed to query PHC param\n");
+		return;
+	}
+
+	ena_phc_enable(adapter, val.vbool);
+}
+
+void ena_devlink_disable_phc_param(struct devlink *devlink)
+{
+	union devlink_param_value value;
+
+	value.vbool = false;
+	devl_param_driverinit_value_set(devlink,
+					DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
+					value);
+}
 
 static void ena_devlink_port_register(struct devlink *devlink)
 {
@@ -79,6 +132,27 @@ static const struct devlink_ops ena_devlink_ops = {
 	.reload_up	= ena_devlink_reload_up,
 };
 
+static int ena_devlink_configure_params(struct devlink *devlink)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+	union devlink_param_value value;
+	int rc;
+
+	rc = devlink_params_register(devlink, ena_devlink_params,
+				     ARRAY_SIZE(ena_devlink_params));
+	if (rc) {
+		netdev_err(adapter->netdev, "Failed to register devlink params\n");
+		return rc;
+	}
+
+	value.vbool = ena_phc_is_enabled(adapter);
+	devl_param_driverinit_value_set(devlink,
+					DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
+					value);
+
+	return 0;
+}
+
 struct devlink *ena_devlink_alloc(struct ena_adapter *adapter)
 {
 	struct device *dev = &adapter->pdev->dev;
@@ -96,11 +170,26 @@ struct devlink *ena_devlink_alloc(struct ena_adapter *adapter)
 	ENA_DEVLINK_PRIV(devlink) = adapter;
 	adapter->devlink = devlink;
 
+	if (ena_devlink_configure_params(devlink))
+		goto free_devlink;
+
 	return devlink;
+
+free_devlink:
+	devlink_free(devlink);
+	return NULL;
+}
+
+static void ena_devlink_configure_params_clean(struct devlink *devlink)
+{
+	devlink_params_unregister(devlink, ena_devlink_params,
+				  ARRAY_SIZE(ena_devlink_params));
 }
 
 void ena_devlink_free(struct devlink *devlink)
 {
+	ena_devlink_configure_params_clean(devlink);
+
 	devlink_free(devlink);
 }
 

drivers/net/ethernet/amazon/ena/ena_devlink.h

@@ -15,5 +15,7 @@ struct devlink *ena_devlink_alloc(struct ena_adapter *adapter);
 void ena_devlink_free(struct devlink *devlink);
 void ena_devlink_register(struct devlink *devlink, struct device *dev);
 void ena_devlink_unregister(struct devlink *devlink);
+void ena_devlink_params_get(struct devlink *devlink);
+void ena_devlink_disable_phc_param(struct devlink *devlink);
 
 #endif /* DEVLINK_H */

drivers/net/ethernet/amazon/ena/ena_netdev.c

@@ -3138,6 +3138,8 @@ static int ena_device_init(struct ena_adapter *adapter, struct pci_dev *pdev,
 		goto err_mmio_read_less;
 	}
 
+	ena_devlink_params_get(adapter->devlink);
+
 	/* ENA admin level init */
 	rc = ena_com_admin_init(ena_dev, &aenq_handlers);
 	if (rc) {

drivers/net/ethernet/amazon/ena/ena_phc.c

@@ -6,6 +6,7 @@
 #include <linux/pci.h>
 #include "ena_netdev.h"
 #include "ena_phc.h"
+#include "ena_devlink.h"
 
 static int ena_phc_adjtime(struct ptp_clock_info *clock_info, s64 delta)
 {
@@ -213,6 +214,7 @@ int ena_phc_init(struct ena_adapter *adapter)
 	ena_com_phc_destroy(ena_dev);
 err_ena_com_phc_init:
 	ena_phc_enable(adapter, false);
+	ena_devlink_disable_phc_param(adapter->devlink);
 	return rc;
 }