[v4,7/7] dts: add scatter test suite

diff --git a/dts/tests/TestSuite_pmd_buffer_scatter.py b/dts/tests/TestSuite_pmd_buffer_scatter.py
new file mode 100644
index 0000000000..8e2a32a1aa
--- /dev/null
+++ b/dts/tests/TestSuite_pmd_buffer_scatter.py
@@ -0,0 +1,105 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2023 University of New Hampshire
+
+"""Multi-segment packet scattering testing suite.
+
+Configure the Rx queues to have mbuf data buffers whose sizes are smaller than the maximum packet
+size (currently set to 2048 to fit a full 1512-byte ethernet frame) and send a total of 5 packets
+with lengths less than, equal to, and greater than the mbuf size (CRC included).
+"""
+import struct
+
+from scapy.layers.inet import IP  # type: ignore[import]
+from scapy.layers.l2 import Ether  # type: ignore[import]
+from scapy.packet import Raw  # type: ignore[import]
+from scapy.utils import hexstr  # type: ignore[import]
+
+from framework.remote_session.remote.testpmd_shell import (
+    TestPmdForwardingModes,
+    TestPmdShell,
+)
+from framework.test_suite import TestSuite
+
+
+class PmdBufferScatter(TestSuite):
+    """DPDK packet scattering test suite.
+
+    Attributes:
+        mbsize: The size to se the mbuf to be.
+    """
+
+    mbsize: int
+
+    def set_up_suite(self) -> None:
+        self.verify(
+            len(self._port_links) > 1,
+            "Must have at least two port links to run scatter",
+        )
+
+        self.tg_node.main_session.configure_port_mtu(9000, self._tg_port_egress)
+        self.tg_node.main_session.configure_port_mtu(9000, self._tg_port_ingress)
+
+    def scatter_pktgen_send_packet(self, pktsize: int) -> str:
+        """Generate and send packet to the SUT.
+
+        Functional test for scatter packets.
+
+        Args:
+            pktsize: Size of the packet to generate and send.
+        """
+        packet = Ether() / IP() / Raw()
+        packet.getlayer(2).load = ""
+        payload_len = pktsize - len(packet) - 4
+        payload = ["58"] * payload_len
+        # pack the payload
+        for X_in_hex in payload:
+            packet.load += struct.pack("=B", int("%s%s" % (X_in_hex[0], X_in_hex[1]), 16))
+        load = hexstr(packet.getlayer(2), onlyhex=1)
+        received_packets = self.send_packet_and_capture(packet)
+        self.verify(len(received_packets) > 0, "Did not receive any packets.")
+        load = hexstr(received_packets[0].getlayer(2), onlyhex=1)
+
+        return load
+
+    def pmd_scatter(self) -> None:
+        """Testpmd support of receiving and sending scattered multi-segment packets.
+
+        Support for scattered packets is shown by sending 5 packets of differing length
+        where the length of the packet is calculated by taking mbuf-size + an offset. The
+        offsets used in the test case are -1, 0, 1, 4, 5 respectively.
+
+        Test:
+            Start testpmd and run functional test with preset mbsize.
+        """
+        testpmd = self.sut_node.create_interactive_shell(
+            TestPmdShell,
+            app_parameters=(
+                "--mbcache=200 "
+                f"--mbuf-size={self.mbsize} "
+                "--max-pkt-len=9000 "
+                "--port-topology=paired "
+                "--tx-offloads=0x00008000"
+            ),
+            privileged=True,
+        )
+        testpmd.set_forward_mode(TestPmdForwardingModes.mac)
+        testpmd.start()
+        link_is_up = testpmd.wait_link_status_up(0) and testpmd.wait_link_status_up(1)
+        self.verify(link_is_up, "Links never came up in TestPMD.")
+
+        for offset in [-1, 0, 1, 4, 5]:
+            recv_payload = self.scatter_pktgen_send_packet(self.mbsize + offset)
+            self.verify(
+                ("58 " * 8).strip() in recv_payload,
+                "Received packet had incorrect payload",
+            )
+        testpmd.stop()
+
+    def test_scatter_mbuf_2048(self) -> None:
+        """Run :func:`~PmdBufferScatter.pmd_scatter` function after setting the `mbsize` to 2048."""
+        self.mbsize = 2048
+        self.pmd_scatter()
+
+    def tear_down_suite(self) -> None:
+        self.tg_node.main_session.configure_port_mtu(1500, self._tg_port_egress)
+        self.tg_node.main_session.configure_port_mtu(1500, self._tg_port_ingress)