Merge branch 'ethtool-add-ability-to-control-transceiver-modules-power-mode'

Ido Schimmel says:

====================
ethtool: Add ability to control transceiver modules' power mode

This patchset extends the ethtool netlink API to allow user space to
control transceiver modules. Two specific APIs are added, but the plan
is to extend the interface with more APIs in the future (see "Future
plans").

This submission is a complete rework of a previous submission [1] that
tried to achieve the same goal by allowing user space to write to the
EEPROMs of these modules. It was rejected as it could have enabled user
space binary blob drivers.

However, the main issue is that by directly writing to some pages of
these EEPROMs, we are interfering with the entity that is controlling
the modules (kernel / device firmware). In addition, some functionality
cannot be implemented solely by writing to the EEPROM, as it requires
the assertion / de-assertion of hardware signals (e.g., "ResetL" pin in
SFF-8636).

Motivation
==========

The kernel can currently dump the contents of module EEPROMs to user
space via the ethtool legacy ioctl API or the new netlink API. These
dumps can then be parsed by ethtool(8) according to the specification
that defines the memory map of the EEPROM. For example, SFF-8636 [2] for
QSFP and CMIS [3] for QSFP-DD.

In addition to read-only elements, these specifications also define
writeable elements that can be used to control the behavior of the
module. For example, controlling whether the module is put in low or
high power mode to limit its power consumption.

The CMIS specification even defines a message exchange mechanism (CDB,
Command Data Block) on top of the module's memory map. This allows the
host to send various commands to the module. For example, to update its
firmware.

Implementation
==============

The ethtool netlink API is extended with two new messages,
'ETHTOOL_MSG_MODULE_SET' and 'ETHTOOL_MSG_MODULE_GET', that allow user
space to set and get transceiver module parameters. Specifically, the
'ETHTOOL_A_MODULE_POWER_MODE_POLICY' attribute allows user space to
control the power mode policy of the module in order to limit its power
consumption. See detailed description in patch #1.

The user API is designed to be generic enough so that it could be used
for modules with different memory maps (e.g., SFF-8636, CMIS).

The only implementation of the device driver API in this series is for a
MAC driver (mlxsw) where the module is controlled by the device's
firmware, but it is designed to be generic enough so that it could also
be used by implementations where the module is controlled by the kernel.

Testing and introspection
=========================

See detailed description in patches #1 and #5.

Patchset overview
=================

Patch #1 adds the initial infrastructure in ethtool along with the
ability to control transceiver modules' power mode.

Patches #2-#3 add required device registers in mlxsw.

Patch #4 implements in mlxsw the ethtool operations added in patch #1.

Patch #5 adds extended link states in order to allow user space to
troubleshoot link down issues related to transceiver modules.

Patch #6 adds support for these extended states in mlxsw.

Future plans
============

* Extend 'ETHTOOL_MSG_MODULE_SET' to control Tx output among other
attributes.

* Add new ethtool message(s) to update firmware on transceiver modules.

* Extend ethtool(8) to parse more diagnostic information from CMIS
modules. No kernel changes required.

[1] https://lore.kernel.org/netdev/20210623075925.2610908-1-idosch@idosch.org/
[2] https://members.snia.org/document/dl/26418
[3] http://www.qsfp-dd.com/wp-content/uploads/2021/05/CMIS5p0.pdf

Previous versions:
[4] https://lore.kernel.org/netdev/20211003073219.1631064-1-idosch@idosch.org/
[5] https://lore.kernel.org/netdev/20210824130344.1828076-1-idosch@idosch.org/
[6] https://lore.kernel.org/netdev/20210818155202.1278177-1-idosch@idosch.org/
[7] https://lore.kernel.org/netdev/20210809102152.719961-1-idosch@idosch.org/
====================

Link: https://lore.kernel.org/r/20211006104647.2357115-1-idosch@idosch.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/networking/ethtool-netlink.rst

@@ -41,6 +41,11 @@ In the message structure descriptions below, if an attribute name is suffixed
 with "+", parent nest can contain multiple attributes of the same type. This
 implements an array of entries.
 
+Attributes that need to be filled-in by device drivers and that are dumped to
+user space based on whether they are valid or not should not use zero as a
+valid value. This avoids the need to explicitly signal the validity of the
+attribute in the device driver API.
+
 
 Request header
 ==============
@@ -179,7 +184,7 @@ according to message purpose:
 
 Userspace to kernel:
 
-  ===================================== ================================
+  ===================================== =================================
   ``ETHTOOL_MSG_STRSET_GET``            get string set
   ``ETHTOOL_MSG_LINKINFO_GET``          get link settings
   ``ETHTOOL_MSG_LINKINFO_SET``          set link settings
@@ -213,7 +218,9 @@ Userspace to kernel:
   ``ETHTOOL_MSG_MODULE_EEPROM_GET``     read SFP module EEPROM
   ``ETHTOOL_MSG_STATS_GET``             get standard statistics
   ``ETHTOOL_MSG_PHC_VCLOCKS_GET``       get PHC virtual clocks info
-  ===================================== ================================
+  ``ETHTOOL_MSG_MODULE_SET``            set transceiver module parameters
+  ``ETHTOOL_MSG_MODULE_GET``            get transceiver module parameters
+  ===================================== =================================
 
 Kernel to userspace:
 
@@ -252,6 +259,7 @@ Kernel to userspace:
   ``ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY``  read SFP module EEPROM
   ``ETHTOOL_MSG_STATS_GET_REPLY``          standard statistics
   ``ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY``    PHC virtual clocks info
+  ``ETHTOOL_MSG_MODULE_GET_REPLY``         transceiver module parameters
   ======================================== =================================
 
 ``GET`` requests are sent by userspace applications to retrieve device
@@ -520,6 +528,8 @@ Link extended states:
                                                         power required from cable or module
 
   ``ETHTOOL_LINK_EXT_STATE_OVERHEAT``                   The module is overheated
+
+  ``ETHTOOL_LINK_EXT_STATE_MODULE``                     Transceiver module issue
   ================================================      ============================================
 
 Link extended substates:
@@ -613,6 +623,14 @@ Link extended substates:
   ``ETHTOOL_LINK_EXT_SUBSTATE_CI_CABLE_TEST_FAILURE``   Cable test failure
   ===================================================   ============================================
 
+  Transceiver module issue substates:
+
+  ===================================================   ============================================
+  ``ETHTOOL_LINK_EXT_SUBSTATE_MODULE_CMIS_NOT_READY``   The CMIS Module State Machine did not reach
+                                                        the ModuleReady state. For example, if the
+                                                        module is stuck at ModuleFault state
+  ===================================================   ============================================
+
 DEBUG_GET
 =========
 
@@ -1521,6 +1539,63 @@ Kernel response contents:
   ``ETHTOOL_A_PHC_VCLOCKS_INDEX``       s32     PHC index array
   ====================================  ======  ==========================
 
+MODULE_GET
+==========
+
+Gets transceiver module parameters.
+
+Request contents:
+
+  =====================================  ======  ==========================
+  ``ETHTOOL_A_MODULE_HEADER``            nested  request header
+  =====================================  ======  ==========================
+
+Kernel response contents:
+
+  ======================================  ======  ==========================
+  ``ETHTOOL_A_MODULE_HEADER``             nested  reply header
+  ``ETHTOOL_A_MODULE_POWER_MODE_POLICY``  u8      power mode policy
+  ``ETHTOOL_A_MODULE_POWER_MODE``         u8      operational power mode
+  ======================================  ======  ==========================
+
+The optional ``ETHTOOL_A_MODULE_POWER_MODE_POLICY`` attribute encodes the
+transceiver module power mode policy enforced by the host. The default policy
+is driver-dependent, but "auto" is the recommended default and it should be
+implemented by new drivers and drivers where conformance to a legacy behavior
+is not critical.
+
+The optional ``ETHTHOOL_A_MODULE_POWER_MODE`` attribute encodes the operational
+power mode policy of the transceiver module. It is only reported when a module
+is plugged-in. Possible values are:
+
+.. kernel-doc:: include/uapi/linux/ethtool.h
+    :identifiers: ethtool_module_power_mode
+
+MODULE_SET
+==========
+
+Sets transceiver module parameters.
+
+Request contents:
+
+  ======================================  ======  ==========================
+  ``ETHTOOL_A_MODULE_HEADER``             nested  request header
+  ``ETHTOOL_A_MODULE_POWER_MODE_POLICY``  u8      power mode policy
+  ======================================  ======  ==========================
+
+When set, the optional ``ETHTOOL_A_MODULE_POWER_MODE_POLICY`` attribute is used
+to set the transceiver module power policy enforced by the host. Possible
+values are:
+
+.. kernel-doc:: include/uapi/linux/ethtool.h
+    :identifiers: ethtool_module_power_mode_policy
+
+For SFF-8636 modules, low power mode is forced by the host according to table
+6-10 in revision 2.10a of the specification.
+
+For CMIS modules, low power mode is forced by the host according to table 6-12
+in revision 5.0 of the specification.
+
 Request translation
 ===================
 
@@ -1620,4 +1695,6 @@ are netlink only.
   n/a                                 ``ETHTOOL_MSG_CABLE_TEST_TDR_ACT``
   n/a                                 ``ETHTOOL_MSG_TUNNEL_INFO_GET``
   n/a                                 ``ETHTOOL_MSG_PHC_VCLOCKS_GET``
+  n/a                                 ``ETHTOOL_MSG_MODULE_GET``
+  n/a                                 ``ETHTOOL_MSG_MODULE_SET``
   =================================== =====================================

drivers/net/ethernet/mellanox/mlxsw/core_env.c

@@ -17,6 +17,7 @@ struct mlxsw_env_module_info {
 	bool is_overheat;
 	int num_ports_mapped;
 	int num_ports_up;
+	enum ethtool_module_power_mode_policy power_mode_policy;
 };
 
 struct mlxsw_env {
@@ -445,6 +446,152 @@ int mlxsw_env_reset_module(struct net_device *netdev,
 }
 EXPORT_SYMBOL(mlxsw_env_reset_module);
 
+int
+mlxsw_env_get_module_power_mode(struct mlxsw_core *mlxsw_core, u8 module,
+				struct ethtool_module_power_mode_params *params,
+				struct netlink_ext_ack *extack)
+{
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
+	char mcion_pl[MLXSW_REG_MCION_LEN];
+	u32 status_bits;
+	int err;
+
+	if (WARN_ON_ONCE(module >= mlxsw_env->module_count))
+		return -EINVAL;
+
+	mutex_lock(&mlxsw_env->module_info_lock);
+
+	params->policy = mlxsw_env->module_info[module].power_mode_policy;
+
+	mlxsw_reg_mcion_pack(mcion_pl, module);
+	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mcion), mcion_pl);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to retrieve module's power mode");
+		goto out;
+	}
+
+	status_bits = mlxsw_reg_mcion_module_status_bits_get(mcion_pl);
+	if (!(status_bits & MLXSW_REG_MCION_MODULE_STATUS_BITS_PRESENT_MASK))
+		goto out;
+
+	if (status_bits & MLXSW_REG_MCION_MODULE_STATUS_BITS_LOW_POWER_MASK)
+		params->mode = ETHTOOL_MODULE_POWER_MODE_LOW;
+	else
+		params->mode = ETHTOOL_MODULE_POWER_MODE_HIGH;
+
+out:
+	mutex_unlock(&mlxsw_env->module_info_lock);
+	return err;
+}
+EXPORT_SYMBOL(mlxsw_env_get_module_power_mode);
+
+static int mlxsw_env_module_enable_set(struct mlxsw_core *mlxsw_core,
+				       u8 module, bool enable)
+{
+	enum mlxsw_reg_pmaos_admin_status admin_status;
+	char pmaos_pl[MLXSW_REG_PMAOS_LEN];
+
+	mlxsw_reg_pmaos_pack(pmaos_pl, module);
+	admin_status = enable ? MLXSW_REG_PMAOS_ADMIN_STATUS_ENABLED :
+				MLXSW_REG_PMAOS_ADMIN_STATUS_DISABLED;
+	mlxsw_reg_pmaos_admin_status_set(pmaos_pl, admin_status);
+	mlxsw_reg_pmaos_ase_set(pmaos_pl, true);
+
+	return mlxsw_reg_write(mlxsw_core, MLXSW_REG(pmaos), pmaos_pl);
+}
+
+static int mlxsw_env_module_low_power_set(struct mlxsw_core *mlxsw_core,
+					  u8 module, bool low_power)
+{
+	u16 eeprom_override_mask, eeprom_override;
+	char pmmp_pl[MLXSW_REG_PMMP_LEN];
+
+	mlxsw_reg_pmmp_pack(pmmp_pl, module);
+	mlxsw_reg_pmmp_sticky_set(pmmp_pl, true);
+	/* Mask all the bits except low power mode. */
+	eeprom_override_mask = ~MLXSW_REG_PMMP_EEPROM_OVERRIDE_LOW_POWER_MASK;
+	mlxsw_reg_pmmp_eeprom_override_mask_set(pmmp_pl, eeprom_override_mask);
+	eeprom_override = low_power ? MLXSW_REG_PMMP_EEPROM_OVERRIDE_LOW_POWER_MASK :
+				      0;
+	mlxsw_reg_pmmp_eeprom_override_set(pmmp_pl, eeprom_override);
+
+	return mlxsw_reg_write(mlxsw_core, MLXSW_REG(pmmp), pmmp_pl);
+}
+
+static int __mlxsw_env_set_module_power_mode(struct mlxsw_core *mlxsw_core,
+					     u8 module, bool low_power,
+					     struct netlink_ext_ack *extack)
+{
+	int err;
+
+	err = mlxsw_env_module_enable_set(mlxsw_core, module, false);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to disable module");
+		return err;
+	}
+
+	err = mlxsw_env_module_low_power_set(mlxsw_core, module, low_power);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to set module's power mode");
+		goto err_module_low_power_set;
+	}
+
+	err = mlxsw_env_module_enable_set(mlxsw_core, module, true);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to enable module");
+		goto err_module_enable_set;
+	}
+
+	return 0;
+
+err_module_enable_set:
+	mlxsw_env_module_low_power_set(mlxsw_core, module, !low_power);
+err_module_low_power_set:
+	mlxsw_env_module_enable_set(mlxsw_core, module, true);
+	return err;
+}
+
+int
+mlxsw_env_set_module_power_mode(struct mlxsw_core *mlxsw_core, u8 module,
+				enum ethtool_module_power_mode_policy policy,
+				struct netlink_ext_ack *extack)
+{
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
+	bool low_power;
+	int err = 0;
+
+	if (WARN_ON_ONCE(module >= mlxsw_env->module_count))
+		return -EINVAL;
+
+	if (policy != ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH &&
+	    policy != ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO) {
+		NL_SET_ERR_MSG_MOD(extack, "Unsupported power mode policy");
+		return -EOPNOTSUPP;
+	}
+
+	mutex_lock(&mlxsw_env->module_info_lock);
+
+	if (mlxsw_env->module_info[module].power_mode_policy == policy)
+		goto out;
+
+	/* If any ports are up, we are already in high power mode. */
+	if (mlxsw_env->module_info[module].num_ports_up)
+		goto out_set_policy;
+
+	low_power = policy == ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO;
+	err = __mlxsw_env_set_module_power_mode(mlxsw_core, module, low_power,
+						extack);
+	if (err)
+		goto out;
+
+out_set_policy:
+	mlxsw_env->module_info[module].power_mode_policy = policy;
+out:
+	mutex_unlock(&mlxsw_env->module_info_lock);
+	return err;
+}
+EXPORT_SYMBOL(mlxsw_env_set_module_power_mode);
+
 static int mlxsw_env_module_has_temp_sensor(struct mlxsw_core *mlxsw_core,
 					    u8 module,
 					    bool *p_has_temp_sensor)
@@ -794,15 +941,33 @@ EXPORT_SYMBOL(mlxsw_env_module_port_unmap);
 int mlxsw_env_module_port_up(struct mlxsw_core *mlxsw_core, u8 module)
 {
 	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
+	int err = 0;
 
 	if (WARN_ON_ONCE(module >= mlxsw_env->module_count))
 		return -EINVAL;
 
 	mutex_lock(&mlxsw_env->module_info_lock);
+
+	if (mlxsw_env->module_info[module].power_mode_policy !=
+	    ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO)
+		goto out_inc;
+
+	if (mlxsw_env->module_info[module].num_ports_up != 0)
+		goto out_inc;
+
+	/* Transition to high power mode following first port using the module
+	 * being put administratively up.
+	 */
+	err = __mlxsw_env_set_module_power_mode(mlxsw_core, module, false,
+						NULL);
+	if (err)
+		goto out_unlock;
+
+out_inc:
 	mlxsw_env->module_info[module].num_ports_up++;
+out_unlock:
 	mutex_unlock(&mlxsw_env->module_info_lock);
-
-	return 0;
+	return err;
 }
 EXPORT_SYMBOL(mlxsw_env_module_port_up);
 
@@ -814,7 +979,22 @@ void mlxsw_env_module_port_down(struct mlxsw_core *mlxsw_core, u8 module)
 		return;
 
 	mutex_lock(&mlxsw_env->module_info_lock);
+
 	mlxsw_env->module_info[module].num_ports_up--;
+
+	if (mlxsw_env->module_info[module].power_mode_policy !=
+	    ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO)
+		goto out_unlock;
+
+	if (mlxsw_env->module_info[module].num_ports_up != 0)
+		goto out_unlock;
+
+	/* Transition to low power mode following last port using the module
+	 * being put administratively down.
+	 */
+	__mlxsw_env_set_module_power_mode(mlxsw_core, module, true, NULL);
+
+out_unlock:
 	mutex_unlock(&mlxsw_env->module_info_lock);
 }
 EXPORT_SYMBOL(mlxsw_env_module_port_down);
@@ -824,7 +1004,7 @@ int mlxsw_env_init(struct mlxsw_core *mlxsw_core, struct mlxsw_env **p_env)
 	char mgpir_pl[MLXSW_REG_MGPIR_LEN];
 	struct mlxsw_env *env;
 	u8 module_count;
-	int err;
+	int i, err;
 
 	mlxsw_reg_mgpir_pack(mgpir_pl);
 	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mgpir), mgpir_pl);
@@ -837,6 +1017,13 @@ int mlxsw_env_init(struct mlxsw_core *mlxsw_core, struct mlxsw_env **p_env)
 	if (!env)
 		return -ENOMEM;
 
+	/* Firmware defaults to high power mode policy where modules are
+	 * transitioned to high power mode following plug-in.
+	 */
+	for (i = 0; i < module_count; i++)
+		env->module_info[i].power_mode_policy =
+			ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH;
+
 	mutex_init(&env->module_info_lock);
 	env->core = mlxsw_core;
 	env->module_count = module_count;

drivers/net/ethernet/mellanox/mlxsw/core_env.h

@@ -28,6 +28,16 @@ int mlxsw_env_reset_module(struct net_device *netdev,
 			   struct mlxsw_core *mlxsw_core, u8 module,
 			   u32 *flags);
 
+int
+mlxsw_env_get_module_power_mode(struct mlxsw_core *mlxsw_core, u8 module,
+				struct ethtool_module_power_mode_params *params,
+				struct netlink_ext_ack *extack);
+
+int
+mlxsw_env_set_module_power_mode(struct mlxsw_core *mlxsw_core, u8 module,
+				enum ethtool_module_power_mode_policy policy,
+				struct netlink_ext_ack *extack);
+
 int
 mlxsw_env_module_overheat_counter_get(struct mlxsw_core *mlxsw_core, u8 module,
 				      u64 *p_counter);

drivers/net/ethernet/mellanox/mlxsw/minimal.c

@@ -145,12 +145,38 @@ static int mlxsw_m_reset(struct net_device *netdev, u32 *flags)
 				      flags);
 }
 
+static int
+mlxsw_m_get_module_power_mode(struct net_device *netdev,
+			      struct ethtool_module_power_mode_params *params,
+			      struct netlink_ext_ack *extack)
+{
+	struct mlxsw_m_port *mlxsw_m_port = netdev_priv(netdev);
+	struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;
+
+	return mlxsw_env_get_module_power_mode(core, mlxsw_m_port->module,
+					       params, extack);
+}
+
+static int
+mlxsw_m_set_module_power_mode(struct net_device *netdev,
+			      const struct ethtool_module_power_mode_params *params,
+			      struct netlink_ext_ack *extack)
+{
+	struct mlxsw_m_port *mlxsw_m_port = netdev_priv(netdev);
+	struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;
+
+	return mlxsw_env_set_module_power_mode(core, mlxsw_m_port->module,
+					       params->policy, extack);
+}
+
 static const struct ethtool_ops mlxsw_m_port_ethtool_ops = {
 	.get_drvinfo		= mlxsw_m_module_get_drvinfo,
 	.get_module_info	= mlxsw_m_get_module_info,
 	.get_module_eeprom	= mlxsw_m_get_module_eeprom,
 	.get_module_eeprom_by_page = mlxsw_m_get_module_eeprom_by_page,
 	.reset			= mlxsw_m_reset,
+	.get_module_power_mode	= mlxsw_m_get_module_power_mode,
+	.set_module_power_mode	= mlxsw_m_set_module_power_mode,
 };
 
 static int

drivers/net/ethernet/mellanox/mlxsw/reg.h

@@ -5946,6 +5946,55 @@ static inline void mlxsw_reg_pddr_pack(char *payload, u8 local_port,
 	mlxsw_reg_pddr_page_select_set(payload, page_select);
 }
 
+/* PMMP - Port Module Memory Map Properties Register
+ * -------------------------------------------------
+ * The PMMP register allows to override the module memory map advertisement.
+ * The register can only be set when the module is disabled by PMAOS register.
+ */
+#define MLXSW_REG_PMMP_ID 0x5044
+#define MLXSW_REG_PMMP_LEN 0x2C
+
+MLXSW_REG_DEFINE(pmmp, MLXSW_REG_PMMP_ID, MLXSW_REG_PMMP_LEN);
+
+/* reg_pmmp_module
+ * Module number.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, pmmp, module, 0x00, 16, 8);
+
+/* reg_pmmp_sticky
+ * When set, will keep eeprom_override values after plug-out event.
+ * Access: OP
+ */
+MLXSW_ITEM32(reg, pmmp, sticky, 0x00, 0, 1);
+
+/* reg_pmmp_eeprom_override_mask
+ * Write mask bit (negative polarity).
+ * 0 - Allow write
+ * 1 - Ignore write
+ * On write, indicates which of the bits from eeprom_override field are
+ * updated.
+ * Access: WO
+ */
+MLXSW_ITEM32(reg, pmmp, eeprom_override_mask, 0x04, 16, 16);
+
+enum {
+	/* Set module to low power mode */
+	MLXSW_REG_PMMP_EEPROM_OVERRIDE_LOW_POWER_MASK = BIT(8),
+};
+
+/* reg_pmmp_eeprom_override
+ * Override / ignore EEPROM advertisement properties bitmask
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, pmmp, eeprom_override, 0x04, 0, 16);
+
+static inline void mlxsw_reg_pmmp_pack(char *payload, u8 module)
+{
+	MLXSW_REG_ZERO(pmmp, payload);
+	mlxsw_reg_pmmp_module_set(payload, module);
+}
+
 /* PLLP - Port Local port to Label Port mapping Register
  * -----------------------------------------------------
  * The PLLP register returns the mapping from Local Port into Label Port.
@@ -10353,6 +10402,39 @@ static inline void mlxsw_reg_mlcr_pack(char *payload, u8 local_port,
 					   MLXSW_REG_MLCR_DURATION_MAX : 0);
 }
 
+/* MCION - Management Cable IO and Notifications Register
+ * ------------------------------------------------------
+ * The MCION register is used to query transceiver modules' IO pins and other
+ * notifications.
+ */
+#define MLXSW_REG_MCION_ID 0x9052
+#define MLXSW_REG_MCION_LEN 0x18
+
+MLXSW_REG_DEFINE(mcion, MLXSW_REG_MCION_ID, MLXSW_REG_MCION_LEN);
+
+/* reg_mcion_module
+ * Module number.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mcion, module, 0x00, 16, 8);
+
+enum {
+	MLXSW_REG_MCION_MODULE_STATUS_BITS_PRESENT_MASK = BIT(0),
+	MLXSW_REG_MCION_MODULE_STATUS_BITS_LOW_POWER_MASK = BIT(8),
+};
+
+/* reg_mcion_module_status_bits
+ * Module IO status as defined by SFF.
+ * Access: RO
+ */
+MLXSW_ITEM32(reg, mcion, module_status_bits, 0x04, 0, 16);
+
+static inline void mlxsw_reg_mcion_pack(char *payload, u8 module)
+{
+	MLXSW_REG_ZERO(mcion, payload);
+	mlxsw_reg_mcion_module_set(payload, module);
+}
+
 /* MTPPS - Management Pulse Per Second Register
  * --------------------------------------------
  * This register provides the device PPS capabilities, configure the PPS in and
@@ -12348,6 +12430,7 @@ static const struct mlxsw_reg_info *mlxsw_reg_infos[] = {
 	MLXSW_REG(pmtdb),
 	MLXSW_REG(pmpe),
 	MLXSW_REG(pddr),
+	MLXSW_REG(pmmp),
 	MLXSW_REG(pllp),
 	MLXSW_REG(htgt),
 	MLXSW_REG(hpkt),
@@ -12396,6 +12479,7 @@ static const struct mlxsw_reg_info *mlxsw_reg_infos[] = {
 	MLXSW_REG(mgir),
 	MLXSW_REG(mrsr),
 	MLXSW_REG(mlcr),
+	MLXSW_REG(mcion),
 	MLXSW_REG(mtpps),
 	MLXSW_REG(mtutc),
 	MLXSW_REG(mpsc),

drivers/net/ethernet/mellanox/mlxsw/spectrum_ethtool.c

@@ -96,6 +96,9 @@ mlxsw_sp_link_ext_state_opcode_map[] = {
 	{1032, ETHTOOL_LINK_EXT_STATE_POWER_BUDGET_EXCEEDED, 0},
 
 	{1030, ETHTOOL_LINK_EXT_STATE_OVERHEAT, 0},
+
+	{1042, ETHTOOL_LINK_EXT_STATE_MODULE,
+	 ETHTOOL_LINK_EXT_SUBSTATE_MODULE_CMIS_NOT_READY},
 };
 
 static void
@@ -124,6 +127,10 @@ mlxsw_sp_port_set_link_ext_state(struct mlxsw_sp_ethtool_link_ext_state_opcode_m
 		link_ext_state_info->cable_issue =
 			link_ext_state_mapping.link_ext_substate;
 		break;
+	case ETHTOOL_LINK_EXT_STATE_MODULE:
+		link_ext_state_info->module =
+			link_ext_state_mapping.link_ext_substate;
+		break;
 	default:
 		break;
 	}
@@ -1206,6 +1213,32 @@ static int mlxsw_sp_reset(struct net_device *dev, u32 *flags)
 	return mlxsw_env_reset_module(dev, mlxsw_sp->core, module, flags);
 }
 
+static int
+mlxsw_sp_get_module_power_mode(struct net_device *dev,
+			       struct ethtool_module_power_mode_params *params,
+			       struct netlink_ext_ack *extack)
+{
+	struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	u8 module = mlxsw_sp_port->mapping.module;
+
+	return mlxsw_env_get_module_power_mode(mlxsw_sp->core, module, params,
+					       extack);
+}
+
+static int
+mlxsw_sp_set_module_power_mode(struct net_device *dev,
+			       const struct ethtool_module_power_mode_params *params,
+			       struct netlink_ext_ack *extack)
+{
+	struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	u8 module = mlxsw_sp_port->mapping.module;
+
+	return mlxsw_env_set_module_power_mode(mlxsw_sp->core, module,
+					       params->policy, extack);
+}
+
 const struct ethtool_ops mlxsw_sp_port_ethtool_ops = {
 	.cap_link_lanes_supported	= true,
 	.get_drvinfo			= mlxsw_sp_port_get_drvinfo,
@@ -1228,6 +1261,8 @@ const struct ethtool_ops mlxsw_sp_port_ethtool_ops = {
 	.get_eth_ctrl_stats		= mlxsw_sp_get_eth_ctrl_stats,
 	.get_rmon_stats			= mlxsw_sp_get_rmon_stats,
 	.reset				= mlxsw_sp_reset,
+	.get_module_power_mode		= mlxsw_sp_get_module_power_mode,
+	.set_module_power_mode		= mlxsw_sp_set_module_power_mode,
 };
 
 struct mlxsw_sp1_port_link_mode {

include/linux/ethtool.h

@@ -94,6 +94,7 @@ struct ethtool_link_ext_state_info {
 		enum ethtool_link_ext_substate_link_logical_mismatch link_logical_mismatch;
 		enum ethtool_link_ext_substate_bad_signal_integrity bad_signal_integrity;
 		enum ethtool_link_ext_substate_cable_issue cable_issue;
+		enum ethtool_link_ext_substate_module module;
 		u8 __link_ext_substate;
 	};
 };
@@ -415,6 +416,17 @@ struct ethtool_module_eeprom {
 	u8	*data;
 };
 
+/**
+ * struct ethtool_module_power_mode_params - module power mode parameters
+ * @policy: The power mode policy enforced by the host for the plug-in module.
+ * @mode: The operational power mode of the plug-in module. Should be filled by
+ *	device drivers on get operations.
+ */
+struct ethtool_module_power_mode_params {
+	enum ethtool_module_power_mode_policy policy;
+	enum ethtool_module_power_mode mode;
+};
+
 /**
  * struct ethtool_ops - optional netdev operations
  * @cap_link_lanes_supported: indicates if the driver supports lanes
@@ -580,6 +592,11 @@ struct ethtool_module_eeprom {
  * @get_eth_ctrl_stats: Query some of the IEEE 802.3 MAC Ctrl statistics.
  * @get_rmon_stats: Query some of the RMON (RFC 2819) statistics.
  *	Set %ranges to a pointer to zero-terminated array of byte ranges.
+ * @get_module_power_mode: Get the power mode policy for the plug-in module
+ *	used by the network device and its operational power mode, if
+ *	plugged-in.
+ * @set_module_power_mode: Set the power mode policy for the plug-in module
+ *	used by the network device.
  *
  * All operations are optional (i.e. the function pointer may be set
  * to %NULL) and callers must take this into account.  Callers must
@@ -705,6 +722,12 @@ struct ethtool_ops {
 	void	(*get_rmon_stats)(struct net_device *dev,
 				  struct ethtool_rmon_stats *rmon_stats,
 				  const struct ethtool_rmon_hist_range **ranges);
+	int	(*get_module_power_mode)(struct net_device *dev,
+					 struct ethtool_module_power_mode_params *params,
+					 struct netlink_ext_ack *extack);
+	int	(*set_module_power_mode)(struct net_device *dev,
+					 const struct ethtool_module_power_mode_params *params,
+					 struct netlink_ext_ack *extack);
 };
 
 int ethtool_check_ops(const struct ethtool_ops *ops);

include/uapi/linux/ethtool.h

@@ -603,6 +603,7 @@ enum ethtool_link_ext_state {
 	ETHTOOL_LINK_EXT_STATE_CALIBRATION_FAILURE,
 	ETHTOOL_LINK_EXT_STATE_POWER_BUDGET_EXCEEDED,
 	ETHTOOL_LINK_EXT_STATE_OVERHEAT,
+	ETHTOOL_LINK_EXT_STATE_MODULE,
 };
 
 /* More information in addition to ETHTOOL_LINK_EXT_STATE_AUTONEG. */
@@ -649,6 +650,11 @@ enum ethtool_link_ext_substate_cable_issue {
 	ETHTOOL_LINK_EXT_SUBSTATE_CI_CABLE_TEST_FAILURE,
 };
 
+/* More information in addition to ETHTOOL_LINK_EXT_STATE_MODULE. */
+enum ethtool_link_ext_substate_module {
+	ETHTOOL_LINK_EXT_SUBSTATE_MODULE_CMIS_NOT_READY = 1,
+};
+
 #define ETH_GSTRING_LEN		32
 
 /**
@@ -706,6 +712,29 @@ enum ethtool_stringset {
 	ETH_SS_COUNT
 };
 
+/**
+ * enum ethtool_module_power_mode_policy - plug-in module power mode policy
+ * @ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH: Module is always in high power mode.
+ * @ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO: Module is transitioned by the host
+ *	to high power mode when the first port using it is put administratively
+ *	up and to low power mode when the last port using it is put
+ *	administratively down.
+ */
+enum ethtool_module_power_mode_policy {
+	ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH = 1,
+	ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO,
+};
+
+/**
+ * enum ethtool_module_power_mode - plug-in module power mode
+ * @ETHTOOL_MODULE_POWER_MODE_LOW: Module is in low power mode.
+ * @ETHTOOL_MODULE_POWER_MODE_HIGH: Module is in high power mode.
+ */
+enum ethtool_module_power_mode {
+	ETHTOOL_MODULE_POWER_MODE_LOW = 1,
+	ETHTOOL_MODULE_POWER_MODE_HIGH,
+};
+
 /**
  * struct ethtool_gstrings - string set for data tagging
  * @cmd: Command number = %ETHTOOL_GSTRINGS

include/uapi/linux/ethtool_netlink.h

@@ -47,6 +47,8 @@ enum {
 	ETHTOOL_MSG_MODULE_EEPROM_GET,
 	ETHTOOL_MSG_STATS_GET,
 	ETHTOOL_MSG_PHC_VCLOCKS_GET,
+	ETHTOOL_MSG_MODULE_GET,
+	ETHTOOL_MSG_MODULE_SET,
 
 	/* add new constants above here */
 	__ETHTOOL_MSG_USER_CNT,
@@ -90,6 +92,8 @@ enum {
 	ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY,
 	ETHTOOL_MSG_STATS_GET_REPLY,
 	ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY,
+	ETHTOOL_MSG_MODULE_GET_REPLY,
+	ETHTOOL_MSG_MODULE_NTF,
 
 	/* add new constants above here */
 	__ETHTOOL_MSG_KERNEL_CNT,
@@ -833,6 +837,19 @@ enum {
 	ETHTOOL_A_STATS_RMON_MAX = (__ETHTOOL_A_STATS_RMON_CNT - 1)
 };
 
+/* MODULE */
+
+enum {
+	ETHTOOL_A_MODULE_UNSPEC,
+	ETHTOOL_A_MODULE_HEADER,		/* nest - _A_HEADER_* */
+	ETHTOOL_A_MODULE_POWER_MODE_POLICY,	/* u8 */
+	ETHTOOL_A_MODULE_POWER_MODE,		/* u8 */
+
+	/* add new constants above here */
+	__ETHTOOL_A_MODULE_CNT,
+	ETHTOOL_A_MODULE_MAX = (__ETHTOOL_A_MODULE_CNT - 1)
+};
+
 /* generic netlink info */
 #define ETHTOOL_GENL_NAME "ethtool"
 #define ETHTOOL_GENL_VERSION 1

net/ethtool/Makefile

@@ -7,4 +7,4 @@ obj-$(CONFIG_ETHTOOL_NETLINK)	+= ethtool_nl.o
 ethtool_nl-y	:= netlink.o bitset.o strset.o linkinfo.o linkmodes.o \
 		   linkstate.o debug.o wol.o features.o privflags.o rings.o \
 		   channels.o coalesce.o pause.o eee.o tsinfo.o cabletest.o \
-		   tunnels.o fec.o eeprom.o stats.o phc_vclocks.o
+		   tunnels.o fec.o eeprom.o stats.o phc_vclocks.o module.o

net/ethtool/module.c

+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/ethtool.h>
+
+#include "netlink.h"
+#include "common.h"
+#include "bitset.h"
+
+struct module_req_info {
+	struct ethnl_req_info base;
+};
+
+struct module_reply_data {
+	struct ethnl_reply_data	base;
+	struct ethtool_module_power_mode_params power;
+};
+
+#define MODULE_REPDATA(__reply_base) \
+	container_of(__reply_base, struct module_reply_data, base)
+
+/* MODULE_GET */
+
+const struct nla_policy ethnl_module_get_policy[ETHTOOL_A_MODULE_HEADER + 1] = {
+	[ETHTOOL_A_MODULE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
+};
+
+static int module_get_power_mode(struct net_device *dev,
+				 struct module_reply_data *data,
+				 struct netlink_ext_ack *extack)
+{
+	const struct ethtool_ops *ops = dev->ethtool_ops;
+
+	if (!ops->get_module_power_mode)
+		return 0;
+
+	return ops->get_module_power_mode(dev, &data->power, extack);
+}
+
+static int module_prepare_data(const struct ethnl_req_info *req_base,
+			       struct ethnl_reply_data *reply_base,
+			       struct genl_info *info)
+{
+	struct module_reply_data *data = MODULE_REPDATA(reply_base);
+	struct netlink_ext_ack *extack = info ? info->extack : NULL;
+	struct net_device *dev = reply_base->dev;
+	int ret;
+
+	ret = ethnl_ops_begin(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = module_get_power_mode(dev, data, extack);
+	if (ret < 0)
+		goto out_complete;
+
+out_complete:
+	ethnl_ops_complete(dev);
+	return ret;
+}
+
+static int module_reply_size(const struct ethnl_req_info *req_base,
+			     const struct ethnl_reply_data *reply_base)
+{
+	struct module_reply_data *data = MODULE_REPDATA(reply_base);
+	int len = 0;
+
+	if (data->power.policy)
+		len += nla_total_size(sizeof(u8));	/* _MODULE_POWER_MODE_POLICY */
+
+	if (data->power.mode)
+		len += nla_total_size(sizeof(u8));	/* _MODULE_POWER_MODE */
+
+	return len;
+}
+
+static int module_fill_reply(struct sk_buff *skb,
+			     const struct ethnl_req_info *req_base,
+			     const struct ethnl_reply_data *reply_base)
+{
+	const struct module_reply_data *data = MODULE_REPDATA(reply_base);
+
+	if (data->power.policy &&
+	    nla_put_u8(skb, ETHTOOL_A_MODULE_POWER_MODE_POLICY,
+		       data->power.policy))
+		return -EMSGSIZE;
+
+	if (data->power.mode &&
+	    nla_put_u8(skb, ETHTOOL_A_MODULE_POWER_MODE, data->power.mode))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+const struct ethnl_request_ops ethnl_module_request_ops = {
+	.request_cmd		= ETHTOOL_MSG_MODULE_GET,
+	.reply_cmd		= ETHTOOL_MSG_MODULE_GET_REPLY,
+	.hdr_attr		= ETHTOOL_A_MODULE_HEADER,
+	.req_info_size		= sizeof(struct module_req_info),
+	.reply_data_size	= sizeof(struct module_reply_data),
+
+	.prepare_data		= module_prepare_data,
+	.reply_size		= module_reply_size,
+	.fill_reply		= module_fill_reply,
+};
+
+/* MODULE_SET */
+
+const struct nla_policy ethnl_module_set_policy[ETHTOOL_A_MODULE_POWER_MODE_POLICY + 1] = {
+	[ETHTOOL_A_MODULE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
+	[ETHTOOL_A_MODULE_POWER_MODE_POLICY] =
+		NLA_POLICY_RANGE(NLA_U8, ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH,
+				 ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO),
+};
+
+static int module_set_power_mode(struct net_device *dev, struct nlattr **tb,
+				 bool *p_mod, struct netlink_ext_ack *extack)
+{
+	struct ethtool_module_power_mode_params power = {};
+	struct ethtool_module_power_mode_params power_new;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
+	int ret;
+
+	if (!tb[ETHTOOL_A_MODULE_POWER_MODE_POLICY])
+		return 0;
+
+	if (!ops->get_module_power_mode || !ops->set_module_power_mode) {
+		NL_SET_ERR_MSG_ATTR(extack,
+				    tb[ETHTOOL_A_MODULE_POWER_MODE_POLICY],
+				    "Setting power mode policy is not supported by this device");
+		return -EOPNOTSUPP;
+	}
+
+	power_new.policy = nla_get_u8(tb[ETHTOOL_A_MODULE_POWER_MODE_POLICY]);
+	ret = ops->get_module_power_mode(dev, &power, extack);
+	if (ret < 0)
+		return ret;
+
+	if (power_new.policy == power.policy)
+		return 0;
+	*p_mod = true;
+
+	return ops->set_module_power_mode(dev, &power_new, extack);
+}
+
+int ethnl_set_module(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ethnl_req_info req_info = {};
+	struct nlattr **tb = info->attrs;
+	struct net_device *dev;
+	bool mod = false;
+	int ret;
+
+	ret = ethnl_parse_header_dev_get(&req_info, tb[ETHTOOL_A_MODULE_HEADER],
+					 genl_info_net(info), info->extack,
+					 true);
+	if (ret < 0)
+		return ret;
+	dev = req_info.dev;
+
+	rtnl_lock();
+	ret = ethnl_ops_begin(dev);
+	if (ret < 0)
+		goto out_rtnl;
+
+	ret = module_set_power_mode(dev, tb, &mod, info->extack);
+	if (ret < 0)
+		goto out_ops;
+
+	if (!mod)
+		goto out_ops;
+
+	ethtool_notify(dev, ETHTOOL_MSG_MODULE_NTF, NULL);
+
+out_ops:
+	ethnl_ops_complete(dev);
+out_rtnl:
+	rtnl_unlock();
+	dev_put(dev);
+	return ret;
+}

net/ethtool/netlink.c

@@ -282,6 +282,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 	[ETHTOOL_MSG_MODULE_EEPROM_GET]	= &ethnl_module_eeprom_request_ops,
 	[ETHTOOL_MSG_STATS_GET]		= &ethnl_stats_request_ops,
 	[ETHTOOL_MSG_PHC_VCLOCKS_GET]	= &ethnl_phc_vclocks_request_ops,
+	[ETHTOOL_MSG_MODULE_GET]	= &ethnl_module_request_ops,
 };
 
 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -593,6 +594,7 @@ ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 	[ETHTOOL_MSG_PAUSE_NTF]		= &ethnl_pause_request_ops,
 	[ETHTOOL_MSG_EEE_NTF]		= &ethnl_eee_request_ops,
 	[ETHTOOL_MSG_FEC_NTF]		= &ethnl_fec_request_ops,
+	[ETHTOOL_MSG_MODULE_NTF]	= &ethnl_module_request_ops,
 };
 
 /* default notification handler */
@@ -686,6 +688,7 @@ static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 	[ETHTOOL_MSG_PAUSE_NTF]		= ethnl_default_notify,
 	[ETHTOOL_MSG_EEE_NTF]		= ethnl_default_notify,
 	[ETHTOOL_MSG_FEC_NTF]		= ethnl_default_notify,
+	[ETHTOOL_MSG_MODULE_NTF]	= ethnl_default_notify,
 };
 
 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
@@ -999,6 +1002,22 @@ static const struct genl_ops ethtool_genl_ops[] = {
 		.policy = ethnl_phc_vclocks_get_policy,
 		.maxattr = ARRAY_SIZE(ethnl_phc_vclocks_get_policy) - 1,
 	},
+	{
+		.cmd	= ETHTOOL_MSG_MODULE_GET,
+		.doit	= ethnl_default_doit,
+		.start	= ethnl_default_start,
+		.dumpit	= ethnl_default_dumpit,
+		.done	= ethnl_default_done,
+		.policy = ethnl_module_get_policy,
+		.maxattr = ARRAY_SIZE(ethnl_module_get_policy) - 1,
+	},
+	{
+		.cmd	= ETHTOOL_MSG_MODULE_SET,
+		.flags	= GENL_UNS_ADMIN_PERM,
+		.doit	= ethnl_set_module,
+		.policy = ethnl_module_set_policy,
+		.maxattr = ARRAY_SIZE(ethnl_module_set_policy) - 1,
+	},
 };
 
 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {

net/ethtool/netlink.h

@@ -337,6 +337,7 @@ extern const struct ethnl_request_ops ethnl_fec_request_ops;
 extern const struct ethnl_request_ops ethnl_module_eeprom_request_ops;
 extern const struct ethnl_request_ops ethnl_stats_request_ops;
 extern const struct ethnl_request_ops ethnl_phc_vclocks_request_ops;
+extern const struct ethnl_request_ops ethnl_module_request_ops;
 
 extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
 extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
@@ -373,6 +374,8 @@ extern const struct nla_policy ethnl_fec_set_policy[ETHTOOL_A_FEC_AUTO + 1];
 extern const struct nla_policy ethnl_module_eeprom_get_policy[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS + 1];
 extern const struct nla_policy ethnl_stats_get_policy[ETHTOOL_A_STATS_GROUPS + 1];
 extern const struct nla_policy ethnl_phc_vclocks_get_policy[ETHTOOL_A_PHC_VCLOCKS_HEADER + 1];
+extern const struct nla_policy ethnl_module_get_policy[ETHTOOL_A_MODULE_HEADER + 1];
+extern const struct nla_policy ethnl_module_set_policy[ETHTOOL_A_MODULE_POWER_MODE_POLICY + 1];
 
 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
@@ -391,6 +394,7 @@ int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info);
 int ethnl_tunnel_info_start(struct netlink_callback *cb);
 int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
 int ethnl_set_fec(struct sk_buff *skb, struct genl_info *info);
+int ethnl_set_module(struct sk_buff *skb, struct genl_info *info);
 
 extern const char stats_std_names[__ETHTOOL_STATS_CNT][ETH_GSTRING_LEN];
 extern const char stats_eth_phy_names[__ETHTOOL_A_STATS_ETH_PHY_CNT][ETH_GSTRING_LEN];