Merge branch 'dpll-expose-lock-status-error-value-to-user'

Jiri Pirko says:

====================
dpll: expose lock status error value to user

From: Jiri Pirko <jiri@nvidia.com>

Allow to expose lock status errort value over new DPLL generic netlink
attribute. Extend the lock_status_get() op by new argument to get the
value from the driver. Implement this new argument fill-up
in mlx5 driver.
====================

Link: https://lore.kernel.org/r/20240130120831.261085-1-jiri@resnulli.us
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

8 files changed, 121 insertions, 9 deletions

diff --git a/Documentation/netlink/specs/dpll.yaml b/Documentation/netlink/specs/dpll.yaml
index b14aed18065f..1755066d8308 100644
--- a/Documentation/netlink/specs/dpll.yaml
+++ b/Documentation/netlink/specs/dpll.yaml
@@ -52,6 +52,40 @@ definitions:
           dpll's lock-state shall remain DPLL_LOCK_STATUS_UNLOCKED)
     render-max: true
   -
+    type: enum
+    name: lock-status-error
+    doc: |
+      if previous status change was done due to a failure, this provides
+      information of dpll device lock status error.
+      Valid values for DPLL_A_LOCK_STATUS_ERROR attribute
+    entries:
+      -
+        name: none
+        doc: |
+          dpll device lock status was changed without any error
+        value: 1
+      -
+        name: undefined
+        doc: |
+          dpll device lock status was changed due to undefined error.
+          Driver fills this value up in case it is not able
+          to obtain suitable exact error type.
+      -
+        name: media-down
+        doc: |
+          dpll device lock status was changed because of associated
+          media got down.
+          This may happen for example if dpll device was previously
+          locked on an input pin of type PIN_TYPE_SYNCE_ETH_PORT.
+      -
+        name: fractional-frequency-offset-too-high
+        doc: |
+          the FFO (Fractional Frequency Offset) between the RX and TX
+          symbol rate on the media got too high.
+          This may happen for example if dpll device was previously
+          locked on an input pin of type PIN_TYPE_SYNCE_ETH_PORT.
+    render-max: true
+  -
     type: const
     name: temp-divider
     value: 1000
@@ -214,6 +248,10 @@ attribute-sets:
         name: type
         type: u32
         enum: type
+      -
+        name: lock-status-error
+        type: u32
+        enum: lock-status-error
   -
     name: pin
     enum-name: dpll_a_pin
@@ -379,6 +417,7 @@ operations:
             - mode
             - mode-supported
             - lock-status
+            - lock-status-error
             - temp
             - clock-id
             - type
diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c
index 314bb3775465..cf3313517ae1 100644
--- a/drivers/dpll/dpll_netlink.c
+++ b/drivers/dpll/dpll_netlink.c
@@ -121,14 +121,21 @@ dpll_msg_add_lock_status(struct sk_buff *msg, struct dpll_device *dpll,
 			 struct netlink_ext_ack *extack)
 {
 	const struct dpll_device_ops *ops = dpll_device_ops(dpll);
+	enum dpll_lock_status_error status_error = 0;
 	enum dpll_lock_status status;
 	int ret;
 
-	ret = ops->lock_status_get(dpll, dpll_priv(dpll), &status, extack);
+	ret = ops->lock_status_get(dpll, dpll_priv(dpll), &status,
+				   &status_error, extack);
 	if (ret)
 		return ret;
 	if (nla_put_u32(msg, DPLL_A_LOCK_STATUS, status))
 		return -EMSGSIZE;
+	if (status_error &&
+	    (status == DPLL_LOCK_STATUS_UNLOCKED ||
+	     status == DPLL_LOCK_STATUS_HOLDOVER) &&
+	    nla_put_u32(msg, DPLL_A_LOCK_STATUS_ERROR, status_error))
+		return -EMSGSIZE;
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_dpll.c b/drivers/net/ethernet/intel/ice/ice_dpll.c
index b9c5eced6326..c0256564e998 100644
--- a/drivers/net/ethernet/intel/ice/ice_dpll.c
+++ b/drivers/net/ethernet/intel/ice/ice_dpll.c
@@ -488,6 +488,7 @@ ice_dpll_hw_input_prio_set(struct ice_pf *pf, struct ice_dpll *dpll,
  * @dpll: registered dpll pointer
  * @dpll_priv: private data pointer passed on dpll registration
  * @status: on success holds dpll's lock status
+ * @status_error: status error value
  * @extack: error reporting
  *
  * Dpll subsystem callback, provides dpll's lock status.
@@ -500,6 +501,7 @@ ice_dpll_hw_input_prio_set(struct ice_pf *pf, struct ice_dpll *dpll,
 static int
 ice_dpll_lock_status_get(const struct dpll_device *dpll, void *dpll_priv,
 			 enum dpll_lock_status *status,
+			 enum dpll_lock_status_error *status_error,
 			 struct netlink_ext_ack *extack)
 {
 	struct ice_dpll *d = dpll_priv;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dpll.c b/drivers/net/ethernet/mellanox/mlx5/core/dpll.c
index 18fed2b34fb1..4ad3d2d3d4c8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/dpll.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/dpll.c
@@ -41,6 +41,7 @@ struct mlx5_dpll_synce_status {
 	enum mlx5_msees_oper_status oper_status;
 	bool ho_acq;
 	bool oper_freq_measure;
+	enum mlx5_msees_failure_reason failure_reason;
 	s32 frequency_diff;
 };
 
@@ -60,6 +61,7 @@ mlx5_dpll_synce_status_get(struct mlx5_core_dev *mdev,
 	synce_status->oper_status = MLX5_GET(msees_reg, out, oper_status);
 	synce_status->ho_acq = MLX5_GET(msees_reg, out, ho_acq);
 	synce_status->oper_freq_measure = MLX5_GET(msees_reg, out, oper_freq_measure);
+	synce_status->failure_reason = MLX5_GET(msees_reg, out, failure_reason);
 	synce_status->frequency_diff = MLX5_GET(msees_reg, out, frequency_diff);
 	return 0;
 }
@@ -99,6 +101,26 @@ mlx5_dpll_lock_status_get(struct mlx5_dpll_synce_status *synce_status)
 	}
 }
 
+static enum dpll_lock_status_error
+mlx5_dpll_lock_status_error_get(struct mlx5_dpll_synce_status *synce_status)
+{
+	switch (synce_status->oper_status) {
+	case MLX5_MSEES_OPER_STATUS_FAIL_HOLDOVER:
+		fallthrough;
+	case MLX5_MSEES_OPER_STATUS_FAIL_FREE_RUNNING:
+		switch (synce_status->failure_reason) {
+		case MLX5_MSEES_FAILURE_REASON_PORT_DOWN:
+			return DPLL_LOCK_STATUS_ERROR_MEDIA_DOWN;
+		case MLX5_MSEES_FAILURE_REASON_TOO_HIGH_FREQUENCY_DIFF:
+			return DPLL_LOCK_STATUS_ERROR_FRACTIONAL_FREQUENCY_OFFSET_TOO_HIGH;
+		default:
+			return DPLL_LOCK_STATUS_ERROR_UNDEFINED;
+		}
+	default:
+		return DPLL_LOCK_STATUS_ERROR_NONE;
+	}
+}
+
 static enum dpll_pin_state
 mlx5_dpll_pin_state_get(struct mlx5_dpll_synce_status *synce_status)
 {
@@ -118,10 +140,11 @@ mlx5_dpll_pin_ffo_get(struct mlx5_dpll_synce_status *synce_status,
 	return 0;
 }
 
-static int mlx5_dpll_device_lock_status_get(const struct dpll_device *dpll,
-					    void *priv,
-					    enum dpll_lock_status *status,
-					    struct netlink_ext_ack *extack)
+static int
+mlx5_dpll_device_lock_status_get(const struct dpll_device *dpll, void *priv,
+				 enum dpll_lock_status *status,
+				 enum dpll_lock_status_error *status_error,
+				 struct netlink_ext_ack *extack)
 {
 	struct mlx5_dpll_synce_status synce_status;
 	struct mlx5_dpll *mdpll = priv;
@@ -131,6 +154,7 @@ static int mlx5_dpll_device_lock_status_get(const struct dpll_device *dpll,
 	if (err)
 		return err;
 	*status = mlx5_dpll_lock_status_get(&synce_status);
+	*status_error = mlx5_dpll_lock_status_error_get(&synce_status);
 	return 0;
 }
 
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 5f858e426bbd..9507681e0d12 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -4209,10 +4209,11 @@ ptp_ocp_detach(struct ptp_ocp *bp)
 	device_unregister(&bp->dev);
 }
 
-static int ptp_ocp_dpll_lock_status_get(const struct dpll_device *dpll,
-					void *priv,
-					enum dpll_lock_status *status,
-					struct netlink_ext_ack *extack)
+static int
+ptp_ocp_dpll_lock_status_get(const struct dpll_device *dpll, void *priv,
+			     enum dpll_lock_status *status,
+			     enum dpll_lock_status_error *status_error,
+			     struct netlink_ext_ack *extack)
 {
 	struct ptp_ocp *bp = priv;
 
diff --git a/include/linux/dpll.h b/include/linux/dpll.h
index 9cf896ea1d41..9cb02ad73d51 100644
--- a/include/linux/dpll.h
+++ b/include/linux/dpll.h
@@ -19,6 +19,7 @@ struct dpll_device_ops {
 			enum dpll_mode *mode, struct netlink_ext_ack *extack);
 	int (*lock_status_get)(const struct dpll_device *dpll, void *dpll_priv,
 			       enum dpll_lock_status *status,
+			       enum dpll_lock_status_error *status_error,
 			       struct netlink_ext_ack *extack);
 	int (*temp_get)(const struct dpll_device *dpll, void *dpll_priv,
 			s32 *temp, struct netlink_ext_ack *extack);
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index c726f90ab752..6c44f107b8ba 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -12705,6 +12705,14 @@ enum mlx5_msees_oper_status {
 	MLX5_MSEES_OPER_STATUS_FAIL_FREE_RUNNING	= 0x5,
 };
 
+enum mlx5_msees_failure_reason {
+	MLX5_MSEES_FAILURE_REASON_UNDEFINED_ERROR		= 0x0,
+	MLX5_MSEES_FAILURE_REASON_PORT_DOWN			= 0x1,
+	MLX5_MSEES_FAILURE_REASON_TOO_HIGH_FREQUENCY_DIFF	= 0x2,
+	MLX5_MSEES_FAILURE_REASON_NET_SYNCHRONIZER_DEVICE_ERROR	= 0x3,
+	MLX5_MSEES_FAILURE_REASON_LACK_OF_RESOURCES		= 0x4,
+};
+
 struct mlx5_ifc_msees_reg_bits {
 	u8         reserved_at_0[0x8];
 	u8         local_port[0x8];
diff --git a/include/uapi/linux/dpll.h b/include/uapi/linux/dpll.h
index b4e947f9bfbc..0c13d7f1a1bc 100644
--- a/include/uapi/linux/dpll.h
+++ b/include/uapi/linux/dpll.h
@@ -50,6 +50,35 @@ enum dpll_lock_status {
 	DPLL_LOCK_STATUS_MAX = (__DPLL_LOCK_STATUS_MAX - 1)
 };
 
+/**
+ * enum dpll_lock_status_error - if previous status change was done due to a
+ *   failure, this provides information of dpll device lock status error. Valid
+ *   values for DPLL_A_LOCK_STATUS_ERROR attribute
+ * @DPLL_LOCK_STATUS_ERROR_NONE: dpll device lock status was changed without
+ *   any error
+ * @DPLL_LOCK_STATUS_ERROR_UNDEFINED: dpll device lock status was changed due
+ *   to undefined error. Driver fills this value up in case it is not able to
+ *   obtain suitable exact error type.
+ * @DPLL_LOCK_STATUS_ERROR_MEDIA_DOWN: dpll device lock status was changed
+ *   because of associated media got down. This may happen for example if dpll
+ *   device was previously locked on an input pin of type
+ *   PIN_TYPE_SYNCE_ETH_PORT.
+ * @DPLL_LOCK_STATUS_ERROR_FRACTIONAL_FREQUENCY_OFFSET_TOO_HIGH: the FFO
+ *   (Fractional Frequency Offset) between the RX and TX symbol rate on the
+ *   media got too high. This may happen for example if dpll device was
+ *   previously locked on an input pin of type PIN_TYPE_SYNCE_ETH_PORT.
+ */
+enum dpll_lock_status_error {
+	DPLL_LOCK_STATUS_ERROR_NONE = 1,
+	DPLL_LOCK_STATUS_ERROR_UNDEFINED,
+	DPLL_LOCK_STATUS_ERROR_MEDIA_DOWN,
+	DPLL_LOCK_STATUS_ERROR_FRACTIONAL_FREQUENCY_OFFSET_TOO_HIGH,
+
+	/* private: */
+	__DPLL_LOCK_STATUS_ERROR_MAX,
+	DPLL_LOCK_STATUS_ERROR_MAX = (__DPLL_LOCK_STATUS_ERROR_MAX - 1)
+};
+
 #define DPLL_TEMP_DIVIDER	1000
 
 /**
@@ -150,6 +179,7 @@ enum dpll_a {
 	DPLL_A_LOCK_STATUS,
 	DPLL_A_TEMP,
 	DPLL_A_TYPE,
+	DPLL_A_LOCK_STATUS_ERROR,
 
 	__DPLL_A_MAX,
 	DPLL_A_MAX = (__DPLL_A_MAX - 1)