sonic-buildimage/files/build_templates/buffers_config.j2

{%- macro set_default_topology() %}
{%- if default_topo is defined %}
{{ default_topo }}
{%- else %}
def
{%- endif %}
{%- endmacro -%}

{# Determine device topology and filename postfix #}
{%- if DEVICE_METADATA is defined %}
{%-     set switch_role = DEVICE_METADATA['localhost']['type'] %}
{%-     if switch_role.lower() == 'torrouter' %}
{%-         set filename_postfix = 't0' %}
{%-     elif switch_role.lower() == 'leafrouter' %}
{%-         set filename_postfix = 't1' %}
{%-     else %}
{%-         set filename_postfix = set_default_topology() %}
{%-     endif %}
{%- else %}
{%-     set filename_postfix = set_default_topology() %}
{%-     set switch_role      = '' %}
{%- endif -%}

{# Import default values from device HWSKU folder #}
{%- import 'buffers_defaults_%s.j2' % filename_postfix as defs %}

{%- set default_cable = defs.default_cable -%}

{# 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 %}
        {%- if switch_role.lower() == 'torrouter' %}
            {%- for local_port in VLAN_MEMBER %}
                {%- set vlan_port = local_port.split("|") %}
                {%- if vlan_port[1] == port_name %}
                    {%- set roles3 = switch_role + '_' + 'server' %}
                    {%- set roles3 = roles3 | lower %}
                    {%- if roles3 in ports2cable %}
                        {%- if cable_len.append(ports2cable[roles3]) %}{% endif %}
                    {%- endif %}
                {%- endif %}
            {%- endfor %}
            {%- if cable_len -%}
                {{ cable_len.0 }}
            {%- else -%}
                {{ default_cable }}
            {%- endif %}
        {%- else -%}
            {{ default_cable }}
        {%- endif %}
    {%- endif %}
{%- endmacro %}

{%- set PORT_ALL  = [] %}

{%- if PORT is not defined %}
    {%- if defs.generate_port_lists(PORT_ALL) %} {% endif %}
{%- else %}
    {%- for port in PORT %}
        {%- if PORT_ALL.append(port) %}{%- endif %}
    {%- endfor %}
{%- endif %}

{%- set port_names_list_all  = [] %}
{%- for port in PORT_ALL %}
    {%- if port_names_list_all.append(port) %}{%- endif %}
{%- endfor %}
{%- set port_names_all  = port_names_list_all  | join(',') %}

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

    {% endfor %}
    }
    },

{% if defs.generate_buffer_pool_and_profiles is defined %}
{{ defs.generate_buffer_pool_and_profiles() }}
{% endif %}

{%- if defs.generate_profile_lists is defined %}
{{ defs.generate_profile_lists(port_names_all) }},
{% endif %}

{%- if defs.generate_pg_profils is defined %}
{{ defs.generate_pg_profils }},
{% else %}
    "BUFFER_PG": {
        "{{ port_names_all }}|0-1": {
            "profile" : "[BUFFER_PROFILE|ingress_lossy_profile]"
        }
    },
{% endif %}

{% if defs.generate_queue_buffers is defined %}
{{ defs.generate_queue_buffers(port_names_all) }}
{% else %}
    "BUFFER_QUEUE": {
        "{{ port_names_all }}|3-4": {
            "profile" : "[BUFFER_PROFILE|egress_lossless_profile]"
        },
        "{{ port_names_all }}|0-1": {
            "profile" : "[BUFFER_PROFILE|egress_lossy_profile]"
        }
    }
{% endif %}
}