Support OTN attenuator and amplifier

1. Add a new precision attribute flag for optical analog values (e.g., gain, tilt, power), instead of using double/float point type which would introduce NaN issue.
2. Add support for optical attenuator in experimental extensions, derived from openconfig-optical-attenuator.yang.
3. Add support for optical amplifier in experimental extensions, derived from openconfig-optical-amplifier.yang.

Signed-off-by: Lu.Mao <lu.mao@molex.com>

Author: oplklum

experimental/saiexperimentalotnattenuator.h

@@ -0,0 +1,270 @@
+/**
+ * Copyright (c) 2014 Microsoft Open Technologies, Inc.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *    not use this file except in compliance with the License. You may obtain
+ *    a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR
+ *    CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT
+ *    LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS
+ *    FOR A PARTICULAR PURPOSE, MERCHANTABILITY OR NON-INFRINGEMENT.
+ *
+ *    See the Apache Version 2.0 License for specific language governing
+ *    permissions and limitations under the License.
+ *
+ *    Microsoft would like to thank the following companies for their review and
+ *    assistance with these files: Intel Corporation, Mellanox Technologies Ltd,
+ *    Dell Products, L.P., Facebook, Inc., Marvell International Ltd.
+ *
+ * @file    saiexperimentalotnattenuator.h
+ *
+ * @brief   This module defines SAI extensions for optical attenuator.
+ * It is derived from openconfig-optical-attenuator.yang, revision 2024-07-10.
+ *
+ * @warning This module is a SAI experimental module
+ */
+
+#if !defined (__SAIEXPERIMENTALOTNATTENUATOR_H_)
+#define __SAIEXPERIMENTALOTNATTENUATOR_H_
+
+#include <saitypes.h>
+
+/**
+ * @defgroup SAIEXPERIMENTALOTNATTENUATOR SAI - Experimental: Attenuator specific API definitions
+ *
+ * @{
+ */
+
+/**
+ * @brief Type definition for different types of optical attenuator operating modes
+ */
+typedef enum _sai_otn_attenuator_mode_t
+{
+    SAI_OTN_ATTENUATOR_MODE_CONSTANT_POWER,
+    SAI_OTN_ATTENUATOR_MODE_CONSTANT_ATTENUATION,
+    SAI_OTN_ATTENUATOR_MODE_SYSTEM_CONTROLLED,
+} sai_otn_attenuator_mode_t;
+
+/**
+ * @brief Attenuator attribute IDs
+ */
+typedef enum _sai_otn_attenuator_attr_t
+{
+    /**
+     * @brief Start of attributes.
+     */
+    SAI_OTN_ATTENUATOR_ATTR_START,
+
+    /**
+     * @brief User-defined name assigned to identify a specific attenuator in the device.
+     *
+     * @type char
+     * @flags MANDATORY_ON_CREATE | CREATE_ONLY
+     */
+    SAI_OTN_ATTENUATOR_ATTR_NAME = SAI_OTN_ATTENUATOR_ATTR_START,
+
+    /**
+     * @brief The operating mode of the attenuator.
+     *
+     * @type sai_otn_attenuator_mode_t
+     * @flags CREATE_AND_SET
+     * @default SAI_OTN_ATTENUATOR_MODE_CONSTANT_ATTENUATION
+     */
+    SAI_OTN_ATTENUATOR_ATTR_ATTENUATION_MODE,
+
+    /**
+     * @brief Power level set on the output of attenuator in units of 0.01dBm.
+     * This leaf is only relevant when in CONSTANT_POWER mode.
+     *
+     * @type sai_int32_t
+     * @flags CREATE_AND_SET
+     * @default 0
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_TARGET_OUTPUT_POWER,
+
+    /**
+     * @brief Attenuation applied by the attenuator in units of 0.01dB.
+     * This leaf is only relevant when in CONSTANT_ATTENUATION mode.
+     *
+     * @type sai_uint32_t
+     * @flags CREATE_AND_SET
+     * @default 500
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_ATTENUATION,
+
+    /**
+     * @brief When true, attenuator is set to specified attenuation or varies to
+     * maintain constant output power. When false, the attenuator is set
+     * max attenuation or blocked.
+     *
+     * @type bool
+     * @flags CREATE_AND_SET
+     * @default true
+     */
+    SAI_OTN_ATTENUATOR_ATTR_ENABLED,
+
+    /**
+     * @brief The max power level allowed on the output of attenuator in units of 0.01dBm.
+     * This leaf is optional when in SYSTEM_CONTROLLED mode.
+     *
+     * @type sai_int32_t
+     * @flags CREATE_AND_SET
+     * @default 0
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_MAX_OUTPUT_POWER,
+
+    /**
+     * @brief A device alarm will be raised within /system/alarms when
+     * system-derived-target-output-power >= max-output-power + max-output-power-threshold.
+     * This leaf is only relevant when in SYSTEM_CONTROLLED mode.
+     *
+     * @type sai_int32_t
+     * @flags CREATE_AND_SET
+     * @default 300
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_MAX_OUTPUT_POWER_THRESHOLD,
+
+    /**
+     * @brief Reference to system-supplied name of the attenuator ingress port.
+     * This leaf is only valid for ports of type INGRESS.
+     *
+     * @type char
+     * @flags READ_ONLY
+     */
+    SAI_OTN_ATTENUATOR_ATTR_INGRESS_PORT,
+
+    /**
+     * @brief Reference to system-supplied name of the attenuator egress port.
+     * This leaf is only valid for ports of type EGRESS.
+     *
+     * @type char
+     * @flags READ_ONLY
+     */
+    SAI_OTN_ATTENUATOR_ATTR_EGRESS_PORT,
+
+    /**
+     * @brief The target output power as determined by the device in units of 0.01dBm.
+     * This leaf is only relevant when in SYSTEM_CONTROLLED mode.
+     *
+     * @type sai_int32_t
+     * @flags READ_ONLY
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_SYSTEM_DERIVED_TARGET_OUTPUT_POWER,
+
+    /**
+     * @brief The actual attenuation applied by the attenuator in units of 0.01dB.
+     *
+     * @type sai_int32_t
+     * @flags READ_ONLY
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_ACTUAL_ATTENUATION,
+
+    /**
+     * @brief The total output optical power of this port in units of 0.01dBm.
+     *
+     * @type sai_int32_t
+     * @flags READ_ONLY
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_OUTPUT_POWER_TOTAL,
+
+    /**
+     * @brief The optical return loss (ORL) is the ratio of the light
+     * reflected back into the port to the light launched out of the port.
+     * ORL is in units of 0.01dB.
+     *
+     * @type sai_int32_t
+     * @flags READ_ONLY
+     * @precision 2
+     */
+    SAI_OTN_ATTENUATOR_ATTR_OPTICAL_RETURN_LOSS,
+
+    /**
+     * @brief End of attributes
+     */
+    SAI_OTN_ATTENUATOR_ATTR_END,
+
+    /** Custom range base value */
+    SAI_OTN_ATTENUATOR_ATTR_CUSTOM_RANGE_START = 0x10000000,
+
+    /** End of custom range base */
+    SAI_OTN_ATTENUATOR_ATTR_CUSTOM_RANGE_END
+
+} sai_otn_attenuator_attr_t;
+
+/**
+ * @brief Create attenuator.
+ *
+ * Allocates and initializes an attenuator.
+ *
+ * @param[out] otn_attenuator_id Attenuator id
+ * @param[in] switch_id Switch id on which the attenuator exists
+ * @param[in] attr_count Number of attributes
+ * @param[in] attr_list Array of attributes
+ *
+ * @return #SAI_STATUS_SUCCESS on success, failure status code on error
+ */
+typedef sai_status_t (*sai_create_otn_attenuator_fn)(
+        _Out_ sai_object_id_t *otn_attenuator_id,
+        _In_ sai_object_id_t switch_id,
+        _In_ uint32_t attr_count,
+        _In_ const sai_attribute_t *attr_list);
+
+/**
+ * @brief Remove attenuator
+ *
+ * @param[in] otn_attenuator_id Attenuator id
+ *
+ * @return #SAI_STATUS_SUCCESS on success, failure status code on error
+ */
+typedef sai_status_t (*sai_remove_otn_attenuator_fn)(
+        _In_ sai_object_id_t otn_attenuator_id);
+
+/**
+ * @brief Set attenuator attribute
+ *
+ * @param[in] otn_attenuator_id Attenuator id
+ * @param[in] attr Attribute
+ *
+ * @return #SAI_STATUS_SUCCESS on success, failure status code on error
+ */
+typedef sai_status_t (*sai_set_otn_attenuator_attribute_fn)(
+        _In_ sai_object_id_t otn_attenuator_id,
+        _In_ const sai_attribute_t *attr);
+
+/**
+ * @brief Get attenuator attribute
+ *
+ * @param[in] otn_attenuator_id Attenuator id
+ * @param[in] attr_count Number of attributes
+ * @param[inout] attr_list Array of attributes
+ *
+ * @return #SAI_STATUS_SUCCESS on success, failure status code on error
+ */
+typedef sai_status_t (*sai_get_otn_attenuator_attribute_fn)(
+        _In_ sai_object_id_t otn_attenuator_id,
+        _In_ uint32_t attr_count,
+        _Inout_ sai_attribute_t *attr_list);
+
+/**
+ * @brief Routing interface methods table retrieved with sai_api_query()
+ */
+typedef struct _sai_otn_attenuator_api_t
+{
+    sai_create_otn_attenuator_fn                create_otn_attenuator;
+    sai_remove_otn_attenuator_fn                remove_otn_attenuator;
+    sai_set_otn_attenuator_attribute_fn         set_otn_attenuator_attribute;
+    sai_get_otn_attenuator_attribute_fn         get_otn_attenuator_attribute;
+} sai_otn_attenuator_api_t;
+
+/**
+ * @}
+ */
+#endif /** __SAIEXPERIMENTALOTNATTENUATOR_H_ */