Minor changes for snappi_tests for T2-ixia, change udp port calculati…

…ons. (sonic-net#15906)

Description of PR
Currently the traffic for RDMA tests use randomly selected udp ports. This sometimes ends up sending traffic in a non-load-balanced way, and causes the tests to fail.

In this PR:

For multiple scripts that use udp: We serialize the UDP port numbers instead of randomly picking the numbers. This allows for more uniform load-balancing spread, and allows tests to pass more.
in multi_lossless helper: We reduce the background traffic rate, and raise the rate for lossless traffic, thus keeping the overall rate still same. This allows for accounting the speed of backplane.

co-authorized by: jianquanye@microsoft.com

tests/snappi_tests/multidut/pfc/files/m2o_fluctuating_lossless_helper.py

@@ -341,7 +341,9 @@ def __gen_data_flow(testbed_config,
         elif 'Test Flow 2 -> 0' in flow.name:
             eth.pfc_queue.value = pfcQueueValueDict[flow_prio[1]]
 
-    src_port = UDP_PORT_START + eth.pfc_queue.value
+    global UDP_PORT_START
+    src_port = UDP_PORT_START
+    UDP_PORT_START += 1
     udp.src_port.increment.start = src_port
     udp.src_port.increment.step = 1
     udp.src_port.increment.count = 1

tests/snappi_tests/multidut/pfc/files/m2o_oversubscribe_lossless_helper.py

@@ -5,7 +5,6 @@
 # Compiled at: 2023-02-10 09:15:26
 from math import ceil                                                                   # noqa: F401
 import logging                                                                          # noqa: F401
-import random
 from tests.common.helpers.assertions import pytest_assert, pytest_require               # noqa: F401
 from tests.common.fixtures.conn_graph_facts import conn_graph_facts, fanout_graph_facts  # noqa: F401
 from tests.common.snappi_tests.snappi_helpers import get_dut_port_id                          # noqa: F401
@@ -20,14 +19,15 @@
 
 PAUSE_FLOW_NAME = 'Pause Storm'
 TEST_FLOW_NAME = 'Test Flow'
-TEST_FLOW_AGGR_RATE_PERCENT = 30
+TEST_FLOW_AGGR_RATE_PERCENT = 35
 BG_FLOW_NAME = 'Background Flow'
-BG_FLOW_AGGR_RATE_PERCENT = 25
+BG_FLOW_AGGR_RATE_PERCENT = 22.5
 DATA_PKT_SIZE = 1024
 DATA_FLOW_DURATION_SEC = 10
 DATA_FLOW_DELAY_SEC = 5
 SNAPPI_POLL_DELAY_SEC = 2
 TOLERANCE_THRESHOLD = 0.05
+UDP_PORT_START = 5000
 
 
 def run_m2o_oversubscribe_lossless_test(api,
@@ -297,10 +297,6 @@ def __gen_data_flow(testbed_config,
     flow.tx_rx.port.tx_name = testbed_config.ports[src_port_id].name
     flow.tx_rx.port.rx_name = testbed_config.ports[dst_port_id].name
     eth, ipv4, udp = flow.packet.ethernet().ipv4().udp()
-    src_port = random.randint(5000, 6000)
-    udp.src_port.increment.start = src_port
-    udp.src_port.increment.step = 1
-    udp.src_port.increment.count = 1
 
     eth.src.value = tx_mac
     eth.dst.value = rx_mac
@@ -320,6 +316,13 @@ def __gen_data_flow(testbed_config,
         elif 'Test Flow 2 -> 0' in flow.name:
             eth.pfc_queue.value = pfcQueueValueDict[flow_prio[1]]
 
+    global UDP_PORT_START
+    src_port = UDP_PORT_START
+    UDP_PORT_START += 1
+    udp.src_port.increment.start = src_port
+    udp.src_port.increment.step = 1
+    udp.src_port.increment.count = 1
+
     ipv4.src.value = tx_port_config.ip
     ipv4.dst.value = rx_port_config.ip
     ipv4.priority.choice = ipv4.priority.DSCP

tests/snappi_tests/multidut/pfc/files/m2o_oversubscribe_lossy_helper.py

@@ -5,7 +5,6 @@
 # Compiled at: 2023-02-10 09:15:26
 from math import ceil                                                                               # noqa: F401
 import logging                                                                                      # noqa: F401
-import random
 from tests.common.helpers.assertions import pytest_assert, pytest_require                           # noqa: F401
 from tests.common.fixtures.conn_graph_facts import conn_graph_facts, fanout_graph_facts             # noqa: F401
 from tests.common.snappi_tests.snappi_helpers import get_dut_port_id                                # noqa: F401
@@ -28,6 +27,7 @@
 DATA_FLOW_DELAY_SEC = 5
 SNAPPI_POLL_DELAY_SEC = 2
 TOLERANCE_THRESHOLD = 0.05
+UDP_PORT_START = 5000
 
 
 def run_pfc_m2o_oversubscribe_lossy_test(api,
@@ -319,10 +319,6 @@ def __gen_data_flow(testbed_config,
     flow.tx_rx.port.tx_name = testbed_config.ports[src_port_id].name
     flow.tx_rx.port.rx_name = testbed_config.ports[dst_port_id].name
     eth, ipv4, udp = flow.packet.ethernet().ipv4().udp()
-    src_port = random.randint(5000, 6000)
-    udp.src_port.increment.start = src_port
-    udp.src_port.increment.step = 1
-    udp.src_port.increment.count = 1
 
     eth.src.value = tx_mac
     eth.dst.value = rx_mac
@@ -342,6 +338,13 @@ def __gen_data_flow(testbed_config,
         elif 'Background Flow 2 -> 0' in flow.name:
             eth.pfc_queue.value = pfcQueueValueDict[flow_prio[1]]
 
+    global UDP_PORT_START
+    src_port = UDP_PORT_START
+    UDP_PORT_START += 1
+    udp.src_port.increment.start = src_port
+    udp.src_port.increment.step = 1
+    udp.src_port.increment.count = 1
+
     ipv4.src.value = tx_port_config.ip
     ipv4.dst.value = rx_port_config.ip
     ipv4.priority.choice = ipv4.priority.DSCP

tests/snappi_tests/multidut/pfcwd/files/pfcwd_multidut_basic_helper.py

@@ -321,7 +321,9 @@ def __gen_traffic(testbed_config,
             else:
                 eth.pfc_queue.value = pfcQueueValueDict[prio]
 
-            src_port = UDP_PORT_START + eth.pfc_queue.value * number_of_streams
+            global UDP_PORT_START
+            src_port = UDP_PORT_START
+            UDP_PORT_START += number_of_streams
             udp.src_port.increment.start = src_port
             udp.src_port.increment.step = 1
             udp.src_port.increment.count = number_of_streams