[swssconfig]: Update Mellanox buffer profile template to work with an…

… incomplete minigraph (sonic-net#332)

Signed-off-by: Andriy Moroz <c_andriym@mellanox.com>

swssconfig/sample/msn27xx.32ports.buffers.json.j2

@@ -169,20 +169,26 @@
 {% set switch_role = DEVICE_METADATA['localhost']['type'] %}
 
 {%- macro cable_length(port_name) -%}
+ {%- set cable_len = [] -%}
  {%- for neighbor in DEVICE_NEIGHBOR -%}
- {%- if DEVICE_NEIGHBOR[neighbor]['local_port'] == port_name -%}
- {%- set neighbor_role = DEVICE_NEIGHBOR[neighbor]['type'] -%}
- {%- set roles1 = switch_role + '_' + neighbor_role %}
- {%- set roles2 = neighbor_role + '_' + switch_role -%}
- {%- if roles1 in ports2cable -%}
- {{ ports2cable[roles1] }}
- {%- elif roles2 in ports2cable -%}
- {{ ports2cable[roles2] }}
- {%- else -%}
- {{ supported_cable | last }}
- {%- endif -%}
+ {%- if DEVICE_NEIGHBOR[neighbor].local_port and DEVICE_NEIGHBOR[neighbor].type -%}
+ {%- if DEVICE_NEIGHBOR[neighbor]['local_port'] == port_name -%}
+  {%- set neighbor_role = DEVICE_NEIGHBOR[neighbor]['type'] -%}
+  {%- set roles1 = switch_role + '_' + neighbor_role %}
+  {%- set roles2 = neighbor_role + '_' + switch_role -%}
+ {%- 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 -%}
+ {{ supported_cable | last }}
+ {%- endif -%}
 {% endmacro %}
 
 {%- macro find_closest_greater_config(speed, cable) -%}
@@ -204,9 +210,13 @@
 {% set ingress_lossless_pg_pool_size = [] %}
 {% set used_pg_profiles = [] %}
 {% for port in PORT %}
- {%- set speed = PORT[port]['speed'] -%}
+ {%- if PORT[port].speed -%}
+ {%- set speed = PORT[port]['speed'] -%}
+ {% else %}
+ {%- set speed = supported_speed|last -%}
+ {%- endif -%}
  {%- set cable = cable_length(port) -%}
- {%- set port_config = speed + '_' + cable -%}
+ {%- set port_config = speed|string + '_' + cable -%}
  {%- if not port_config in portconfig2profile -%}
  {% set port_config = find_closest_greater_config(speed, cable) -%}
  {%- endif -%}