[QoS, Buffer template][new HW SKU] Add qos config and buffer profile for Arista SKU (#8380)

Author: ysmanman

device/arista/x86_64-arista_7800r3_48cq2_lc/Arista-7800R3-48CQ2-C48/buffers.json.j2

@@ -0,0 +1,2 @@
+{%- set default_topo = 't2' %}
+{%- include 'buffers_config.j2' %}

device/arista/x86_64-arista_7800r3_48cq2_lc/Arista-7800R3-48CQ2-C48/buffers_defaults_t2.j2

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+
+{%- set default_cable = '5m' %}
+
+{%- macro generate_port_lists(PORT_ALL) %}
+    {# Generate list of ports #}
+    {%- for port_idx in range(0,192,4) %}
+        {%- if PORT_ALL.append("Ethernet%d" % (port_idx)) %}{%- endif %}
+    {%- endfor %}
+{%- endmacro %}
+
+{%- macro generate_buffer_pool_and_profiles() %}
+    "BUFFER_POOL": {
+        "ingress_lossless_pool": {
+            "size": "3220805000",
+            "type": "both",
+            "mode": "dynamic",
+            "xoff": "2102272"
+        }
+    },
+    "BUFFER_PROFILE": {
+        "ingress_lossless_profile": {
+            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
+            "size":"1280",
+            "dynamic_th":"-2",
+            "xon_offset":"2560",
+            "xon":"0",
+            "xoff":"66048"
+        },
+        "ingress_lossy_profile": {
+            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
+            "size":"0",
+            "xon_offset":"0",
+            "static_th":"30535680"
+        },
+        "egress_lossless_profile": {
+            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
+            "size":"0",
+            "static_th":"33030144"
+        },
+        "egress_lossy_profile": {
+            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
+            "size":"0",
+            "dynamic_th":"-1"
+        }
+    },
+{%- endmacro %}
+
+{%- macro generate_queue_buffers(port_names) %}
+    "BUFFER_QUEUE": {
+{% for port in port_names.split(',') %}
+        "{{ port }}|3-4": {
+            "profile" : "[BUFFER_PROFILE|ingress_lossless_profile]"
+        },
+{% endfor %}
+{% for port in port_names.split(',') %}
+        "{{ port }}|0-2": {
+            "profile" : "[BUFFER_PROFILE|egress_lossy_profile]"
+        },
+{% endfor %}
+{% for port in port_names.split(',') %}
+        "{{ port }}|5-6": {
+            "profile" : "[BUFFER_PROFILE|egress_lossy_profile]"
+        }{% if not loop.last %},{% endif %}
+{% endfor %}   
+    }
+{%- endmacro %}

device/arista/x86_64-arista_7800r3_48cq2_lc/Arista-7800R3-48CQ2-C48/pg_profile_lookup.ini

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+# PG lossless profiles.
+# speed cable size    xon  xoff threshold xon_offset
+  10000  5m   1280    2560 45506   0        1280
+  25000  5m   1280    2560 49152   0        1280
+  40000  5m   1280    2560 49152   0        1280
+  50000  5m   1280    2560 53248   0        1280
+ 100000  5m   1280    2560 65536   0        1280
+ 200000  5m   1280    2560 90112   0        1280
+ 400000  5m   1280    2560 135168  0        1280
+  10000  40m  1280    2560 45506   0        1280
+  25000  40m  1280    2560 49152   0        1280
+  40000  40m  1280    2560 53248   0        1280
+  50000  40m  1280    2560 57344   0        1280
+ 100000  40m  1280    2560 69632   0        1280
+ 200000  40m  1280    2560 102400  0        1280
+ 400000  40m  1280    2560 159744  0        1280
+  10000  300m 1280    2560 49152   0        1280
+  25000  300m 1280    2560 61440   0        1280
+  40000  300m 1280    2560 69632   0        1280
+  50000  300m 1280    2560 77824   0        1280
+ 100000  300m 1280    2560 114688  0        1280
+ 200000  300m 1280    2560 188416  0        1280
+ 400000  300m 1280    2560 331776  0        1280

device/arista/x86_64-arista_7800r3_48cq2_lc/Arista-7800R3-48CQ2-C48/qos.json.j2

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+{%- macro generate_wred_profiles() %}
+    "WRED_PROFILE": {
+        "AZURE_LOSSLESS" : {
+            "wred_green_enable"      : "true",
+            "wred_yellow_enable"     : "true",
+            "wred_red_enable"        : "true",
+            "ecn"                    : "ecn_all",
+            "green_max_threshold"    : "2097152",
+            "green_min_threshold"    : "250000",
+            "yellow_max_threshold"   : "2097152",
+            "yellow_min_threshold"   : "1048576",
+            "red_max_threshold"      : "2097152",
+            "red_min_threshold"      : "1048576",
+            "green_drop_probability" : "5",
+            "yellow_drop_probability": "5",
+            "red_drop_probability"   : "5"
+        }
+    },
+{%- endmacro %}
+
+{%- include 'qos_config.j2' %}