Enhance generic hash script packet sending function (sonic-net#14139)

1. In case of a weak nic, when packet is not received, resend the packet
2. Loop more times to make hash result more stable

Change-Id: I89bfa1e4de43e281d82d736b102dc33a55a8e089

Author: echuawu

ansible/roles/test/files/ptftests/py3/generic_hash_test.py

@@ -379,8 +379,17 @@ def check_ip_route(self, pkt, masked_expected_pkt, sending_port):
         send the packet and check it is received by one of the expected ports
         """
         testutils.send_packet(self, sending_port, pkt)
-        port_index, received = testutils.verify_packet_any_port(
-            self, masked_expected_pkt, self.expected_port_list, timeout=0.1)
+        try:
+            port_index, received = testutils.verify_packet_any_port(
+                self, masked_expected_pkt, self.expected_port_list, timeout=0.1)
+        except AssertionError:
+            logging.error("Traffic wasn't sent successfully, trying again")
+            logging.info(f"Expected packet: {masked_expected_pkt}")
+            for _ in range(5):
+                testutils.send_packet(self, sending_port, pkt, count=1)
+                time.sleep(0.1)
+            port_index, received = testutils.verify_packet_any_port(
+                self, masked_expected_pkt, self.expected_port_list, timeout=1)
         # The port_index is the index of expected_port_list, need to convert it to the ptf port index
         return self.expected_port_list[port_index], received
 

tests/hash/generic_hash_helper.py

@@ -57,7 +57,7 @@
 l2_ports = set()
 vlans_to_remove = []
 interfaces_to_startup = []
-balancing_test_times = 240
+balancing_test_times = 480
 balancing_range = 0.25
 balancing_range_in_port = 0.8
 vxlan_ecmp_utils = VxLAN_Ecmp_Utils()