[PATCH v1] dts: add ipgre test suite

[Andrew Bailey <abailey@iol.unh.edu>]

Port over the IP GRE test suite from old DTS to next DTS. This test
suite covers GRE tunneling and checksum offload verification using this
protocol.

Bugzilla ID: 1480

Signed-off-by: Andrew Bailey <abailey@iol.unh.edu>
---
 doc/api/dts/tests.TestSuite_ip_gre.rst |   8 +
 dts/api/testpmd/__init__.py            |  23 ++
 dts/tests/TestSuite_ip_gre.py          | 301 +++++++++++++++++++++++++
 3 files changed, 332 insertions(+)
 create mode 100644 doc/api/dts/tests.TestSuite_ip_gre.rst
 create mode 100644 dts/tests/TestSuite_ip_gre.py

diff --git a/doc/api/dts/tests.TestSuite_ip_gre.rst b/doc/api/dts/tests.TestSuite_ip_gre.rst
new file mode 100644
index 0000000000..e8ce01dc0b
--- /dev/null
+++ b/doc/api/dts/tests.TestSuite_ip_gre.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: BSD-3-Clause
+
+ip_gre Test Suite
+=================
+
+.. automodule:: tests.TestSuite_ip_gre
+   :members:
+   :show-inheritance:
diff --git a/dts/api/testpmd/__init__.py b/dts/api/testpmd/__init__.py
index e9187440bb..33bf5e63de 100644
--- a/dts/api/testpmd/__init__.py
+++ b/dts/api/testpmd/__init__.py
@@ -951,6 +951,29 @@ def set_flow_control(
                     f"Testpmd failed to set the {flow_ctrl} in port {port}."
                 )
 
+    def set_csum_parse_tunnel(self, port: int, on: bool, verify: bool = True) -> None:
+        """Set parse tunnel on or of in testpmd for a given port.
+
+        Args:
+            port: The ID of the requested port
+            on: set parse tunnel on if `on` is :data:`True`, otherwise off
+            verify: if :data:`True`, the output of the command is scanned to verify that
+                parse tunnel was set successfully
+
+        Raises:
+            InteractiveCommandExecutionError: If `verify` is :data:`True` and the command
+                fails to execute.
+
+        """
+        output = self.send_command(f"csum parse-tunnel {"on" if on else "off"} {port}")
+        if verify and f"Parse tunnel is {'on' if on else'off'}" not in output:
+            self._logger.debug(
+                f"Testpmd failed to set csum parse-tunnel {'on' if on else 'off'} in port {port}"
+            )
+            raise InteractiveCommandExecutionError(
+                f"Testpmd failed to set csum parse-tunnel {'on' if on else 'off'} in port {port}"
+            )
+
     def show_port_flow_info(self, port: int) -> TestPmdPortFlowCtrl | None:
         """Show port info flow.
 
diff --git a/dts/tests/TestSuite_ip_gre.py b/dts/tests/TestSuite_ip_gre.py
new file mode 100644
index 0000000000..fc51eef181
--- /dev/null
+++ b/dts/tests/TestSuite_ip_gre.py
@@ -0,0 +1,301 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2026 University of New Hampshire
+
+"""DPDK IP GRE test suite."""
+
+from scapy.layers.inet import GRE, IP, TCP, UDP
+from scapy.layers.inet6 import IPv6
+from scapy.layers.l2 import Dot1Q, Ether
+from scapy.layers.sctp import SCTP
+from scapy.packet import Packet
+
+from api.capabilities import (
+    NicCapability,
+    requires_nic_capability,
+)
+from api.packet import send_packet_and_capture
+from api.test import verify
+from api.testpmd import TestPmd
+from api.testpmd.config import SimpleForwardingModes
+from api.testpmd.types import (
+    ChecksumOffloadOptions,
+    PacketOffloadFlag,
+    RtePTypes,
+    TestPmdVerbosePacket,
+)
+from framework.test_suite import TestSuite, func_test
+
+SRC_ID = "FF:FF:FF:FF:FF:FF"
+
+
+class TestIpGre(TestSuite):
+    """IP GRE test suite."""
+
+    def _check_for_matching_packet(
+        self, output: list[TestPmdVerbosePacket], flags: RtePTypes
+    ) -> bool:
+        """Returns :data:`True` if the packet in verbose output contains all specified flags."""
+        for packet in output:
+            if packet.src_mac == SRC_ID:
+                if flags not in packet.hw_ptype and flags not in packet.sw_ptype:
+                    return False
+        return True
+
+    def _send_packet_and_verify_flags(
+        self, expected_flag: RtePTypes, packet: Packet, testpmd: TestPmd
+    ) -> None:
+        """Sends a packet to the DUT and verifies the verbose ptype flags."""
+        send_packet_and_capture(packet=packet)
+        verbose_output = testpmd.extract_verbose_output(testpmd.stop(verify=True))
+        valid = self._check_for_matching_packet(output=verbose_output, flags=expected_flag)
+        verify(valid, f"Packet type flag did not match the expected flag: {expected_flag}.")
+
+    def _setup_session(
+        self, testpmd: TestPmd, expected_flags: list[RtePTypes], packet_list=list[Packet]
+    ) -> None:
+        """Sets the forwarding and verbose mode of each test case interactive shell session."""
+        testpmd.set_forward_mode(SimpleForwardingModes.rxonly)
+        testpmd.set_verbose(level=1)
+        for i in range(0, len(packet_list)):
+            testpmd.start(verify=True)
+            self._send_packet_and_verify_flags(
+                expected_flag=expected_flags[i], packet=packet_list[i], testpmd=testpmd
+            )
+
+    def _send_packet_and_verify_checksum(
+        self, packet: Packet, good_L4: bool, good_IP: bool, testpmd: TestPmd
+    ) -> None:
+        """Send packet and verify verbose output matches expected output."""
+        testpmd.start()
+        send_packet_and_capture(packet=packet)
+        verbose_output = testpmd.extract_verbose_output(testpmd.stop())
+        is_IP = is_L4 = None
+        for testpmd_packet in verbose_output:
+            if testpmd_packet.src_mac == SRC_ID:
+                is_IP = PacketOffloadFlag.RTE_MBUF_F_RX_IP_CKSUM_GOOD in testpmd_packet.ol_flags
+                is_L4 = PacketOffloadFlag.RTE_MBUF_F_RX_L4_CKSUM_GOOD in testpmd_packet.ol_flags
+        verify(
+            is_IP is not None and is_L4 is not None,
+            "Test packet was dropped when it should have been received.",
+        )
+        verify(is_L4 == good_L4, "Layer 4 checksum flag did not match expected checksum flag.")
+        verify(is_IP == good_IP, "IP checksum flag did not match expected checksum flag.")
+
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_GRE_TNL_TSO)
+    @func_test
+    def gre_ip4_pkt_detect(self) -> None:
+        """GRE IP4 packet send and detect.
+
+        Steps:
+            * Craft packets using GRE tunneling.
+            * Send them to the testpmd application.
+
+        Verify:
+            * All packets were received.
+        """
+        packets = [
+            Ether(src=SRC_ID) / IP() / GRE() / IP() / UDP(),
+            Ether(src=SRC_ID) / IP() / GRE() / IP() / TCP(),
+            Ether(src=SRC_ID) / IP() / GRE() / IP() / SCTP(),
+            Ether(src=SRC_ID) / Dot1Q() / IP() / GRE() / IP() / UDP(),
+            Ether(src=SRC_ID) / Dot1Q() / IP() / GRE() / IP() / TCP(),
+            Ether(src=SRC_ID) / Dot1Q() / IP() / GRE() / IP() / SCTP(),
+        ]
+        flags = [
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV4
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_UDP,
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV4
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_TCP,
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV4
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_SCTP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV4
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_UDP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV4
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_TCP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV4
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_SCTP,
+        ]
+        with TestPmd() as testpmd:
+            self._setup_session(testpmd=testpmd, expected_flags=flags, packet_list=packets)
+
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_GRE_TNL_TSO)
+    @func_test
+    def gre_ip6_outer_ip4_inner_pkt_detect(self) -> None:
+        """GRE IPv6 outer and IPv4 inner send and detect.
+
+        Steps:
+            * Craft packets using GRE tunneling.
+            * Send them to the testpmd application.
+
+        Verify:
+            * All packets were received.
+        """
+        packets = [
+            Ether(src=SRC_ID) / IPv6() / GRE() / IP() / UDP(),
+            Ether(src=SRC_ID) / IPv6() / GRE() / IP() / TCP(),
+            Ether(src=SRC_ID) / IPv6() / GRE() / IP() / SCTP(),
+            Ether(src=SRC_ID) / Dot1Q() / IPv6() / GRE() / IP() / UDP(),
+            Ether(src=SRC_ID) / Dot1Q() / IPv6() / GRE() / IP() / TCP(),
+            Ether(src=SRC_ID) / Dot1Q() / IPv6() / GRE() / IP() / SCTP(),
+        ]
+        flags = [
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_UDP,
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_TCP,
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_SCTP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_UDP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_TCP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV4
+            | RtePTypes.INNER_L4_SCTP,
+        ]
+        with TestPmd() as testpmd:
+            self._setup_session(testpmd=testpmd, expected_flags=flags, packet_list=packets)
+
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_GRE_TNL_TSO)
+    @func_test
+    def gre_ip6_outer_ip6_inner_pkt_detect(self) -> None:
+        """GRE IPv6 outer and inner send and detect.
+
+        Steps:
+            * Craft packets using GRE tunneling.
+            * Send them to the testpmd application.
+
+        Verify:
+            * All packets were received.
+        """
+        packets = [
+            Ether(src=SRC_ID) / IPv6() / GRE() / IPv6() / UDP(),
+            Ether(src=SRC_ID) / IPv6() / GRE() / IPv6() / TCP(),
+            Ether(src=SRC_ID) / IPv6() / GRE() / IPv6() / SCTP(),
+            Ether(src=SRC_ID) / Dot1Q() / IPv6() / GRE() / IPv6() / UDP(),
+            Ether(src=SRC_ID) / Dot1Q() / IPv6() / GRE() / IPv6() / TCP(),
+            Ether(src=SRC_ID) / Dot1Q() / IPv6() / GRE() / IPv6() / SCTP(),
+        ]
+        flags = [
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV6
+            | RtePTypes.INNER_L4_UDP,
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV6
+            | RtePTypes.INNER_L4_TCP,
+            RtePTypes.L2_ETHER
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV6
+            | RtePTypes.INNER_L4_SCTP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV6
+            | RtePTypes.INNER_L4_UDP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV6
+            | RtePTypes.INNER_L4_TCP,
+            RtePTypes.L2_ETHER_VLAN
+            | RtePTypes.L3_IPV6
+            | RtePTypes.TUNNEL_GRE
+            | RtePTypes.INNER_L3_IPV6
+            | RtePTypes.INNER_L4_SCTP,
+        ]
+        with TestPmd() as testpmd:
+            self._setup_session(testpmd=testpmd, expected_flags=flags, packet_list=packets)
+
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_OUTER_IPV4_CKSUM)
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_IPV4_CKSUM)
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_TCP_CKSUM)
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_UDP_CKSUM)
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_SCTP_CKSUM)
+    @requires_nic_capability(NicCapability.PORT_TX_OFFLOAD_GRE_TNL_TSO)
+    @func_test
+    def gre_checksum_offload(self) -> None:
+        """GRE checksum offload test.
+
+        Steps:
+            * Craft packets using GRE tunneling.
+            * Alter checksum of each packet.
+            * Send packets to the testpmd application.
+
+        Verify:
+            * All packets were received with the expected checksum flags.
+        """
+        packets = [
+            Ether(src=SRC_ID) / IP(chksum=0x0) / GRE() / IP() / TCP(),
+            Ether(src=SRC_ID) / IP() / GRE() / IP(chksum=0x0) / TCP(),
+            Ether(src=SRC_ID) / IP() / GRE() / IP() / TCP(chksum=0x0),
+            Ether(src=SRC_ID) / IP() / GRE() / IP() / UDP(chksum=0xFFFF),
+            Ether(src=SRC_ID) / IP() / GRE() / IP() / SCTP(chksum=0x0),
+        ]
+        good_l4_ip = [
+            (True, True),
+            (True, False),
+            (False, True),
+            (False, True),
+            (False, True),
+        ]
+        with TestPmd() as testpmd:
+            testpmd.set_forward_mode(SimpleForwardingModes.csum)
+            testpmd.csum_set_hw(
+                layers=ChecksumOffloadOptions.ip
+                | ChecksumOffloadOptions.udp
+                | ChecksumOffloadOptions.outer_ip
+                | ChecksumOffloadOptions.sctp
+                | ChecksumOffloadOptions.tcp,
+                port_id=0,
+            )
+            testpmd.set_csum_parse_tunnel(port=0, on=True)
+            testpmd.set_verbose(1)
+            testpmd.start_all_ports()
+            testpmd.start()
+            for i in range(len(packets)):
+                self._send_packet_and_verify_checksum(
+                    packets[i],
+                    good_l4_ip[i][0],
+                    good_l4_ip[i][1],
+                    testpmd,
+                )
-- 
2.50.1