sonic-buildimage/device/arista/x86_64-arista_7050_qx32s/Arista-7050-QX-32S/buffers.json.j2

{# Default values which will be used if no actual configura available #}
{% set default_cable = '300m' %}
{% set default_speed = '100G' %}
{% set default_ports_num = 32 -%}

{# Port configuration to cable length look-up table #}
{# Each record describes mapping of DUT (DUT port) role and neighbor role to cable length #}
{# Roles described in the minigraph #}
{% set ports2cable = {
        'torrouter_server'       : '5m',
        'leafrouter_torrouter'   : '40m',
        'spinerouter_leafrouter' : '300m'
        }
%}

{%- macro cable_length(port_name) -%}
    {%- set cable_len = [] -%}
    {%- for local_port in DEVICE_NEIGHBOR -%}
        {%- if local_port == port_name -%}
            {%- if DEVICE_NEIGHBOR_METADATA[DEVICE_NEIGHBOR[local_port].name] -%}
                {%- set neighbor = DEVICE_NEIGHBOR_METADATA[DEVICE_NEIGHBOR[local_port].name] -%}
                {%- set neighbor_role = neighbor.type -%}
                {%- set roles1 = switch_role + '_' + neighbor_role %}
                {%- set roles2 = neighbor_role + '_' + switch_role -%}
                {%- set roles1 = roles1 | lower -%}
                {%- set roles2 = roles2 | lower -%}
                {%- if roles1 in ports2cable -%}
                    {%- if cable_len.append(ports2cable[roles1]) -%}{%- endif -%}
                {%- elif roles2 in ports2cable -%}
                    {%- if cable_len.append(ports2cable[roles2]) -%}{%- endif -%}
                {%- endif -%}
            {%- endif -%}
        {%- endif -%}
    {%- endfor -%}
    {%- if cable_len -%}
        {{ cable_len.0 }}
    {%- else -%}
        {{ default_cable }}
    {%- endif -%}
{% endmacro %}

{%- if DEVICE_METADATA is defined %}
{%- set switch_role = DEVICE_METADATA['localhost']['type'] %}
{%- endif -%}

{# Generate list of ports if not defined #}
{% if PORT is not defined %}
    {% set PORT = [] %}
    {% for port_idx in range(0,default_ports_num) %}
        {% if PORT.append("Ethernet%d" % (port_idx*4)) %}{% endif %}
    {% endfor %}
{% endif -%}

{% set port_names_list = [] %}
{% for port in PORT %}
    {%- if port_names_list.append(port) %}{% endif %}
{% endfor %}
{% set port_names = port_names_list | join(',') -%}

{
    "CABLE_LENGTH": {
        "AZURE": {
    {% for port in PORT %}
        {% set cable = cable_length(port) -%}
        "{{ port }}": "{{ cable }}"{%- if not loop.last -%},{% endif %}

    {% endfor %}
    }
    },
    "BUFFER_POOL": {
        "ingress_lossless_pool": {
            "size": "12766208",
            "type": "ingress",
            "mode": "dynamic"
        },
        "egress_lossless_pool": {
            "size": "12766208",
            "type": "egress",
            "mode": "static"
        },
        "egress_lossy_pool": {
            "size": "8072396",
            "type": "egress",
            "mode": "dynamic"
        }
    },
    "BUFFER_PROFILE": {
        "ingress_lossless_profile": {
            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
            "xon":"18432",
            "xoff":"40560",
            "size":"41808",
            "dynamic_th":"-4",
            "xon_offset":"2496"
        },
        "ingress_lossy_profile": {
            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
            "size":"0",
            "dynamic_th":"3"
        },
        "egress_lossless_profile": {
            "pool":"[BUFFER_POOL|egress_lossless_pool]",
            "size":"0",
            "static_th":"12766208"
        },
        "egress_lossy_profile": {
            "pool":"[BUFFER_POOL|egress_lossy_pool]",
            "size":"1518",
            "dynamic_th":"3"
        }
    },
    "BUFFER_PG": {
        "{{ port_names }}|3-4": {
            "profile" : "[BUFFER_PROFILE|ingress_lossless_profile]"
        },
        "{{ port_names }}|0-1": {
            "profile" : "[BUFFER_PROFILE|ingress_lossy_profile]"
        }
    },
    "BUFFER_QUEUE": {
        "{{ port_names }}|3-4": {
            "profile" : "[BUFFER_PROFILE|egress_lossless_profile]"
        },
        "{{ port_names }}|0-1": {
            "profile" : "[BUFFER_PROFILE|egress_lossy_profile]"
        }
    }
}