[PATCH v1 1/2] dts: add promiscuous mode verification test

[Thomas Wilks <thomas.wilks@arm.com>]

Added verification that enables promiscuous mode,
sends a packet with a different destination mac address
and then disables promiscuous mode, sends the same packet
and checks if the packet was filtered out.

Signed-off-by: Thomas Wilks <thomas.wilks@arm.com>
---
Reviewed-by: Luca Vizzarro <luca.vizzarro@arm.com>
Reviewed-by: Paul Szczepanek <paul.szczepanek@arm.com>
---
 dts/tests/TestSuite_promisc_support.py | 63 ++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 dts/tests/TestSuite_promisc_support.py

diff --git a/dts/tests/TestSuite_promisc_support.py b/dts/tests/TestSuite_promisc_support.py
new file mode 100644
index 0000000000..a3ea2461f0
--- /dev/null
+++ b/dts/tests/TestSuite_promisc_support.py
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2025 Arm Limited
+
+"""Promiscuous mode support test suite.
+
+Test promiscuous support by sending a packet with a different destination
+mac address from the TG to the SUT.
+"""
+
+from scapy.layers.inet import IP
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+
+from framework.remote_session.testpmd_shell import TestPmdShell
+from framework.test_suite import TestSuite, func_test
+
+
+class TestPromiscSupport(TestSuite):
+    """Promiscuous mode support test suite."""
+
+    #: Alternate MAC address.
+    ALTERNATIVE_MAC_ADDRESS: str = "02:00:00:00:00:00"
+
+    @func_test
+    def test_promisc_packets(self) -> None:
+        """Verify that promiscuous mode works.
+
+        Steps:
+            Create a packet with a different mac address to the destination.
+            Enable promiscuous mode.
+            Send and receive packet.
+            Disable promiscuous mode.
+            Send and receive packet.
+        Verify:
+            Packet sent with the wrong address is received in promiscuous mode and filtered out
+            otherwise.
+
+        """
+        packet = [Ether(dst=self.ALTERNATIVE_MAC_ADDRESS) / IP() / Raw(load=b"\x00" * 64)]
+
+        with TestPmdShell(
+            self.sut_node,
+        ) as testpmd:
+            for port_id in range(len(self.sut_node.ports)):
+                testpmd.set_promisc(port=port_id, enable=True, verify=True)
+            testpmd.start()
+
+            received_packets = self.send_packets_and_capture(packet)
+            expected_packets = self.get_expected_packets(packet, sent_from_tg=True)
+            self.match_all_packets(expected_packets, received_packets)
+
+            testpmd.stop()
+
+            for port_id in range(len(self.sut_node.ports)):
+                testpmd.set_promisc(port=port_id, enable=False, verify=True)
+            testpmd.start()
+
+            received_packets = self.send_packets_and_capture(packet)
+            expected_packets = self.get_expected_packets(packet, sent_from_tg=True)
+            self.verify(
+                not self.match_all_packets(expected_packets, received_packets, verify=False),
+                "Invalid packet wasn't filtered out.",
+            )
-- 
2.43.0