Incremental QOS config updater test update

tests/generic_config_updater/gu_utils.py

@@ -10,7 +10,7 @@
 
 CONTAINER_SERVICES_LIST = ["swss", "syncd", "radv", "lldp", "dhcp_relay", "teamd", "bgp", "pmon", "telemetry", "acms"]
 DEFAULT_CHECKPOINT_NAME = "test"
-YANG_IGNORED_OPTIONS    = "-i /FEATURE -i /QUEUE -i /SCHEDULER"
+YANG_IGNORED_OPTIONS    = "-i /FEATURE -i /QUEUE -i /SCHEDULER -i /BUFFER_PORT_INGRESS_PROFILE_LIST -i /BUFFER_PORT_EGRESS_PROFILE_LIST"
 
 def generate_tmpfile(duthost):
     """Generate temp file

tests/generic_config_updater/test_incremental_qos.py

@@ -1,13 +1,14 @@
+from __future__ import division
 import logging
 import json
 import pytest
 
-from tests.common.helpers.assertions import pytest_assert
+from tests.common.helpers.assertions import pytest_assert, pytest_require
 from tests.common.utilities import wait_until
-from tests.common.config_reload import config_reload
 from tests.common.helpers.dut_utils import verify_orchagent_running_or_assert
 from tests.generic_config_updater.gu_utils import apply_patch, expect_op_success, expect_res_success, expect_op_failure
 from tests.generic_config_updater.gu_utils import generate_tmpfile, delete_tmpfile
+from tests.generic_config_updater.gu_utils import create_checkpoint, delete_checkpoint, rollback_or_reload
 
 pytestmark = [
     pytest.mark.topology('t0'),
@@ -16,6 +17,18 @@
 
 logger = logging.getLogger(__name__)
 
+LOSSLESS_PGS = 2
+LOSSY_PGS = 1
+MGMT_POOL = 256
+EGRESS_MIRRORING = 10
+MIN_LOSSY_BUFFER_THRESHOLD = 19
+EGRESS_POOL_THRESHOLD = 9
+OPER_HEADROOM_SIZE = 19
+INGRESS_POOL_THRESHOLD = 10
+HEADROOM_POOL_OVERSUB = 2
+MMU_SIZE = 13619
+READ_ASICDB_TIMEOUT = 480
+READ_ASICDB_INTERVAL = 20
 
 @pytest.fixture(scope="module")
 def ensure_dut_readiness(duthost):
@@ -25,69 +38,189 @@ def ensure_dut_readiness(duthost):
     Args:
         duthost: DUT host object
     """
-    config_tmpfile = generate_tmpfile(duthost)
-    logger.info("config_tmpfile {}".format(config_tmpfile))
-    logger.info("Backing up config_db.json")
-    duthost.shell("sudo cp /etc/sonic/config_db.json {}".format(config_tmpfile))
     verify_orchagent_running_or_assert(duthost)
+    create_checkpoint(duthost)
 
     yield
+
+    try:
+        verify_orchagent_running_or_assert(duthost)
+        logger.info("Rolled back to original checkpoint")
+        rollback_or_reload(duthost)
+    finally:
+        delete_checkpoint(duthost)
 
-    verify_orchagent_running_or_assert(duthost)
-    logger.info("Restoring config_db.json")
-    duthost.shell("sudo cp {} /etc/sonic/config_db.json".format(config_tmpfile))
-    delete_tmpfile(duthost, config_tmpfile)
-    config_reload(duthost)
 
-    logger.info("TEARDOWN COMPLETED")
+def get_uplink_downlink_count(duthost, tbinfo):
+    """
+    Retrieves uplink and downlink count from DEVICE_NEIGHBOR_METADATA based on topology 
+
+    Args:
+        duthost: DUT host object
+        tbinfo: information about the running testbed
 
+    Returns:
+        uplink count, downlink count
 
-def prepare_configdb_field(duthost, configdb_field, value):
     """
-    Prepares config db by setting BUFFER_POOL key and field to specified value. If value is empty string or None, delete the current entry.
+    config_facts = duthost.config_facts(host=duthost.hostname, source="running")['ansible_facts']
+    device_neighbor_metadata = config_facts['DEVICE_NEIGHBOR_METADATA']
+    topo = tbinfo['topo']['name']
+
+    if "t1" in topo:
+        spine_router_count = 0
+        tor_router_count = 0
+        for neighbor in device_neighbor_metadata.keys():
+            neighbor_data = device_neighbor_metadata[neighbor]
+            if neighbor_data['type'] == "SpineRouter":
+                spine_router_count += 1
+            elif neighbor_data['type'] == "ToRRouter":
+                tor_router_count += 1
+        return spine_router_count, tor_router_count
+
+    elif "t0" in topo:
+        leaf_router_count = 0
+        server_count = 0
+        for neighbor in device_neighbor_metadata.keys():
+            neighbor_data = device_neighbor_metadata[neighbor]
+            if neighbor_data['type'] == "LeafRouter":
+                leaf_router_count += 1
+            elif neighbor_data['type'] == "Server":
+                server_count += 1
+        return leaf_router_count, server_count
+
+
+def get_neighbor_type_to_pg_headroom_map(duthost):
+    """
+    Calculates pg headroom based on the present neighbor types
 
     Args:
         duthost: DUT host object
-        configdb_field: field in config_db BUFFER_POOL table of the form key/value
-        value: BUFFER_POOL table value to be set
+
+    Returns:
+        A map of neighbor type to its corresponding pg headroom value
     """
+    config_facts = duthost.config_facts(host=duthost.hostname, source="running")['ansible_facts']
+    device_neighbor_metadata = config_facts['DEVICE_NEIGHBOR_METADATA']
+    interfaces_data = config_facts['PORT']
+    neighbor_set = set()
+    neighbor_to_interface_map = {}
+    neighbor_to_type_map =  {}
+    neighbor_type_to_pg_headroom_map = {}
+
+    for neighbor in device_neighbor_metadata.keys():
+        neighbor_set.add(neighbor)
+        neighbor_data = device_neighbor_metadata[neighbor]
+        neighbor_to_type_map[neighbor] = neighbor_data['type']
+
+    for interface in interfaces_data.keys():
+        for neighbor in neighbor_set:
+            if neighbor in json.dumps(interfaces_data[interface]):
+                neighbor_to_interface_map[neighbor] = interface
+                break
 
-    configdb_field_elements = configdb_field.split('/')
-    pytest_assert((len(configdb_field_elements) == 2), "Configdb field not identifiable")
+    for neighbor in neighbor_set:
+        interface = neighbor_to_interface_map[neighbor]
+
+        cable_length = duthost.shell('sonic-db-cli CONFIG_DB hget "CABLE_LENGTH|AZURE" {}'.format(interface))['stdout']
+        port_speed = duthost.shell('sonic-db-cli CONFIG_DB hget "PORT|{}" speed'.format(interface))['stdout']
+
+        expected_profile = 'pg_lossless_{}_{}_profile'.format(port_speed, cable_length)
+
+        xoff = int(duthost.shell('sonic-db-cli APPL_DB hget "BUFFER_PROFILE_TABLE:{}" xoff'.format(expected_profile))['stdout'])
+        xon = int(duthost.shell('sonic-db-cli APPL_DB hget "BUFFER_PROFILE_TABLE:{}" xon'.format(expected_profile))['stdout'])
+        pg_headroom = int((xoff + xon) / 1024)
+
+        neighbor_type = neighbor_to_type_map[neighbor]
+        neighbor_type_to_pg_headroom_map[neighbor_type] = pg_headroom
+
+    return neighbor_type_to_pg_headroom_map
+
+
+def calculate_field_value(duthost, tbinfo, field):
+    """
+    Calculates value of specified field
 
-    key = configdb_field_elements[0]
-    field = configdb_field_elements[1]
-    logger.info("Setting configdb key: {} field: {} to value: {}".format(key, field, value))
+    Args:
+        duthost: DUT host object
+        tbinfo: information about the running testbed
+        field: xoff, ingress_lossless_pool_size, or egress_lossy_pool_size
 
-    if value:
-        cmd = "sonic-db-cli CONFIG_DB hset \"BUFFER_POOL|{}\" \"{}\" \"{}\" ".format(key, field, value)
+    """
+    uplink, downlink = get_uplink_downlink_count(duthost, tbinfo)
+    uplink_downlink_sum = uplink + downlink
+    system_reserved = uplink_downlink_sum * EGRESS_MIRRORING + MGMT_POOL
+    user_reserved = uplink_downlink_sum * LOSSY_PGS * MIN_LOSSY_BUFFER_THRESHOLD + uplink_downlink_sum * EGRESS_POOL_THRESHOLD
+    private_headroom = uplink_downlink_sum * LOSSLESS_PGS * OPER_HEADROOM_SIZE + uplink_downlink_sum * INGRESS_POOL_THRESHOLD
+
+    config_headroom_int_sum = 0
+    neighbor_type_to_pg_headroom_map = get_neighbor_type_to_pg_headroom_map(duthost)
+    for neighbor_type in neighbor_type_to_pg_headroom_map:
+        if neighbor_type == "SpineRouter" or "LeafRouter":
+            config_headroom_uplink_multiplier = neighbor_type_to_pg_headroom_map[neighbor_type]
+            config_headroom_int_sum = uplink * config_headroom_uplink_multiplier + config_headroom_int_sum
+        elif neighbor_type == "LeafRouter" or "Server":
+            config_headroom_downlink_multiplier = neighbor_type_to_pg_headroom_map[neighbor_type]
+            config_headroom_int_sum = downlink * config_headroom_downlink_multiplier + config_headroom_int_sum
+    config_headroom = LOSSLESS_PGS * config_headroom_int_sum
+
+    headroom_pool = int((config_headroom - private_headroom) / HEADROOM_POOL_OVERSUB)
+
+    if ("xoff" in field):
+        return headroom_pool
     else:
-        cmd = "sonic-db-cli CONFIG_DB del \"BUFFER_POOL|{}\" \"{}\" ".format(key, field)
+        operational_headroom = headroom_pool + private_headroom
+        ingress_lossless_egress_lossy = MMU_SIZE - operational_headroom - user_reserved - system_reserved
+        return ingress_lossless_egress_lossy
 
-    verify_orchagent_running_or_assert(duthost)
 
+def ensure_application_of_updated_config(duthost, configdb_field, value):
+    """
+    Ensures application of the JSON patch config update
 
-@pytest.mark.parametrize("configdb_field", ["ingress_lossless_pool/xoff", "ingress_lossless_pool/size", "egress_lossy_pool/size"])
-@pytest.mark.parametrize("operation", ["add", "replace", "remove"])
-@pytest.mark.parametrize("field_pre_status", ["existing", "nonexistent"])
-def test_incremental_qos_config_updates(duthost, ensure_dut_readiness, configdb_field, operation, field_pre_status):
-    operation_to_new_value_map = {"add": "678", "replace": "789", "remove": ""}
-    field_pre_status_to_value_map = {"existing": "567", "nonexistent": ""}
+    Args:
+        duthost: DUT host object
+        configdb_field: config db field under test
+        value: expected value of configdb_field
+    """
+    def _confirm_value_in_asic_db():
+        if "ingress_lossless_pool" in configdb_field:
+            buffer_pool = "ingress_lossless_pool"
+        elif "egress_lossy_pool" in configdb_field:
+            buffer_pool = "egress_lossy_pool"
+        oid = duthost.shell('sonic-db-cli COUNTERS_DB HGET COUNTERS_BUFFER_POOL_NAME_MAP {}'.format(buffer_pool))["stdout"]
+        buffer_pool_data = duthost.shell('sonic-db-cli ASIC_DB hgetall ASIC_STATE:SAI_OBJECT_TYPE_BUFFER_POOL:{}'.format(oid))["stdout"]
+        return str(value) in buffer_pool_data
+
+    pytest_assert(
+        wait_until(READ_ASICDB_TIMEOUT, READ_ASICDB_INTERVAL, 0, _confirm_value_in_asic_db),
+        "ASIC DB does not properly reflect newly configured field: {} expected value: {}".format(configdb_field, value)
+    )
 
-    prepare_configdb_field(duthost, configdb_field, field_pre_status_to_value_map[field_pre_status])
 
+@pytest.mark.parametrize("configdb_field", ["ingress_lossless_pool/xoff", "ingress_lossless_pool/size", "egress_lossy_pool/size"])
+@pytest.mark.parametrize("operation", ["add", "replace", "remove"])
+def test_incremental_qos_config_updates(duthost, tbinfo, ensure_dut_readiness, configdb_field, operation):
+    pytest_require('2700' in duthost.facts['hwsku'], "This test only runs on Mellanox 2700 devices")
     tmpfile = generate_tmpfile(duthost)
     logger.info("tmpfile {} created for json patch of field: {} and operation: {}".format(tmpfile, configdb_field, operation))
 
+    if operation == "remove":
+        value= ""
+    else:
+        value = calculate_field_value(duthost, tbinfo, configdb_field)
+    logger.info("value to be added to json patch: {} operation: {} field: {}".format(value, operation, configdb_field))
+
     json_patch = [
         {
             "op": "{}".format(operation),
             "path": "/BUFFER_POOL/{}".format(configdb_field),
-            "value": "{}".format(operation_to_new_value_map[operation])
-        }
-    ]
-
-    output = apply_patch(duthost, json_data=json_patch, dest_file=tmpfile)
-    expect_op_success(duthost, output)
-
-    delete_tmpfile(duthost, tmpfile)
+            "value": "{}".format(value)
+        }]
+
+    try:
+        output = apply_patch(duthost, json_data=json_patch, dest_file=tmpfile)
+        expect_op_success(duthost, output)
+        ensure_application_of_updated_config(duthost, configdb_field, value)
+    finally:
+        delete_tmpfile(duthost, tmpfile)