[RFC PATCH v1 0/3] dts: port over stats checks

[RFC PATCH v1 0/3] dts: port over stats checks

[jspewock]

From: Jeremy Spewock <jspewock@iol.unh.edu>

This series ports over the functionality of the stats_checks test suite
from old DTS, but I left it as an RFC just because the verification is
different than other test suites that we have written. Mainly because
verifying the accuracy of the port statistics while accounting for
noise on the wire is not the most straight-forward task. The way I
decided to differentiate noise from valid packets in this suite was I
used the MAC addresses of the packets and the software packet types
that are provided in the verbose output of testpmd.

Another idea for how to do this that I tried was using packet
checksums. I wanted originally to send packets with bad checksums and
assume that noise on the wire would either have a valid checksum or no
checksum at all, but this unfortunately only works for the RX side of
verbose output as the TX side does not reflect the same checksum
information.

Jeremy Spewock (3):
  dts: add clearing port stats and verbose mode to testpmd
  dts: add port stats checks test suite
  dts: add stats checks to schemai

 dts/framework/config/conf_yaml_schema.json    |   3 +-
 dts/framework/remote_session/testpmd_shell.py |  62 +++++++
 dts/tests/TestSuite_port_stats_checks.py      | 156 ++++++++++++++++++
 3 files changed, 220 insertions(+), 1 deletion(-)
 create mode 100644 dts/tests/TestSuite_port_stats_checks.py

-- 
2.45.2

[RFC PATCH v1 1/3] dts: add clearing port stats and verbose mode to testpmd

[jspewock]

From: Jeremy Spewock <jspewock@iol.unh.edu>

Methods currently exist for querying the statistics of a port in
testpmd, but there weren't methods added for clearing the current
statistics on a port. This patch adds methods that allow you to clear
the statistics of a single port or all ports to account for situations
where the user only wants the port statistics after a certain point and
does not care about any existing prior values.

This patch also contains methods for modifying the verbose level of
testpmd so that users are able to utilize the extra information that it
provides.

Depends-on: patch-142762 ("dts: add text parser for testpmd verbose
 output")

Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>
---
 dts/framework/remote_session/testpmd_shell.py | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/dts/framework/remote_session/testpmd_shell.py b/dts/framework/remote_session/testpmd_shell.py
index dedf1553cf..cbea03464f 100644
--- a/dts/framework/remote_session/testpmd_shell.py
+++ b/dts/framework/remote_session/testpmd_shell.py
@@ -948,6 +948,68 @@ def extract_verbose_output(output: str) -> list[TestPmdVerboseOutput]:
         iter = re.finditer(r"(port \d+/queue \d+:.*?(?=port \d+/queue \d+|$))", output, re.S)
         return [TestPmdVerboseOutput.parse(s.group(0)) for s in iter]
 
+    def clear_port_stats(self, port_id: int, verify: bool = True) -> None:
+        """Clear statistics of a given port.
+
+        Args:
+            port_id: ID of the port to clear the statistics on.
+            verify: If :data:`True` the output of the command will be scanned to verify that it was
+                successful, otherwise failures will be ignored. Defaults to :data:`True`.
+
+        Raises:
+            InteractiveCommandExecutionError: If `verify` is :data:`True` and testpmd fails to
+                clear the statistics of the given port.
+        """
+        clear_output = self.send_command(f"clear port stats {port_id}")
+        if verify and f"NIC statistics for port {port_id} cleared" not in clear_output:
+            raise InteractiveCommandExecutionError(
+                f"Test pmd failed to set clear forwarding stats on port {port_id}"
+            )
+
+    def clear_port_stats_all(self, verify: bool = True) -> None:
+        """Clear the statistics of all ports that testpmd is aware of.
+
+        Args:
+            verify: If :data:`True` the output of the command will be scanned to verify that all
+                ports had their statistics cleared, otherwise failures will be ignored. Defaults to
+                :data:`True`.
+
+        Raises:
+            InteractiveCommandExecutionError: If `verify` is :data:`True` and testpmd fails to
+                clear the statistics of any of its ports.
+        """
+        clear_output = self.send_command("clear port stats all")
+        if verify:
+            if type(self._app_params.ports) is list:
+                for port_id in range(len(self._app_params.ports)):
+                    if f"NIC statistics for port {port_id} cleared" not in clear_output:
+                        raise InteractiveCommandExecutionError(
+                            f"Test pmd failed to set clear forwarding stats on port {port_id}"
+                        )
+
+    def set_verbose(self, level: int, verify: bool = True) -> None:
+        """Set debug verbosity level.
+
+        Args:
+            level: 0 - silent except for error
+                1 - fully verbose except for Tx packets
+                2 - fully verbose except for Rx packets
+                >2 - fully verbose
+            verify: if :data:`True` an additional command will be sent to verify that verbose level
+                is properly set. Defaults to :data:`True`.
+
+        Raises:
+            InteractiveCommandExecutionError: If `verify` is :data:`True` and verbose level
+            is not correctly set.
+        """
+        verbose_output = self.send_command(f"set verbose {level}")
+        if verify:
+            if "Change verbose level" not in verbose_output:
+                self._logger.debug(f"Failed to set verbose level to {level}: \n{verbose_output}")
+                raise InteractiveCommandExecutionError(
+                    f"Testpmd failed to set verbose level to {level}."
+                )
+
     def _close(self) -> None:
         """Overrides :meth:`~.interactive_shell.close`."""
         self.stop()
-- 
2.45.2

[RFC PATCH v1 2/3] dts: add port stats checks test suite

[jspewock]

From: Jeremy Spewock <jspewock@iol.unh.edu>

This patch adds a new test suite to DTS that validates the accuracy of
the port statistics using testpmd. The functionality is tested by
sending a packet of a fixed side to the SUT and verifying that the
statistic for packets received, received bytes, packets sent, and sent
bytes all update accordingly.

Depends-on: patch-142762 ("dts: add text parser for testpmd verbose
 output")

Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>
---
 dts/tests/TestSuite_port_stats_checks.py | 156 +++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 dts/tests/TestSuite_port_stats_checks.py

diff --git a/dts/tests/TestSuite_port_stats_checks.py b/dts/tests/TestSuite_port_stats_checks.py
new file mode 100644
index 0000000000..71e1c7906f
--- /dev/null
+++ b/dts/tests/TestSuite_port_stats_checks.py
@@ -0,0 +1,156 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2024 University of New Hampshire
+
+"""Port Statistics testing suite.
+
+This test suite tests the functionality of querying the statistics of a port and verifies that the
+values provided in the statistics accurately reflect the traffic that has been handled on the port.
+This is shown by sending a packet of a fixed size to the SUT and verifying that the number of RX
+packets has increased by 1, the number of RX bytes has increased by the specified size, the number
+of TX packets has also increased by 1 (since we expect the packet to be forwarded), and the number
+of TX bytes has also increased by the same fixed amount.
+"""
+
+from typing import ClassVar, Tuple
+
+from scapy.layers.inet import IP  # type: ignore[import-untyped]
+from scapy.layers.l2 import Ether  # type: ignore[import-untyped]
+from scapy.packet import Packet, Raw  # type: ignore[import-untyped]
+
+from framework.params.testpmd import SimpleForwardingModes
+from framework.remote_session.testpmd_shell import TestPmdShell, TestPmdVerboseOutput
+from framework.test_suite import TestSuite
+
+
+class TestPortStatsChecks(TestSuite):
+    """DPDK Port statistics testing suite.
+
+    Support for port statistics is tested by sending a packet of a fixed size denoted by
+    `total_packet_len` and verifying the that TX/RX packets of the TX/RX ports updated by exactly
+    1 and the TX/RX bytes of the TX/RX ports updated by exactly `total_packet_len`. This is done by
+    finding the total amount of packets that were sent/received which did not originate from this
+    test suite and taking the sum of the lengths of each of these "noise" packets and subtracting
+    it from the total values in the port statistics so that all that is left are relevant values.
+    """
+
+    #: Port where traffic will be received on the SUT.
+    recv_port: ClassVar[int] = 0
+    #: Port where traffic will be sent from on the SUT.
+    send_port: ClassVar[int] = 1
+
+    #:
+    ip_header_len: ClassVar[int] = 20
+    #:
+    ether_header_len: ClassVar[int] = 14
+
+    #: Length of the packet being sent including the IP and frame headers.
+    total_packet_len: ClassVar[int] = 100
+    #: Packet to send during testing.
+    send_pkt: ClassVar[Packet] = (
+        Ether() / IP() / Raw("X" * (total_packet_len - ip_header_len - ether_header_len))
+    )
+
+    def extract_noise_information(
+        self, verbose_out: list[TestPmdVerboseOutput]
+    ) -> Tuple[int, int, int, int]:
+        """Extract information about packets that were not sent by the framework in `verbose_out`.
+
+        Extract the number of sent/received packets that did not originate from this test suite as
+        well as the sum of the lengths of said "noise" packets. Note that received packets are only
+        examined on the port with the ID `self.recv_port` since these are the receive stats that
+        will be analyzed in this suite. Sent packets are also only examined on the port with the ID
+        `self.send_port`.
+
+        Packets are considered to be "noise" when they don't match the expected structure of the
+        packets that are being sent by this test suite. Specifically, the source and destination
+        mac addresses as well as the software packet type are checked on packets received by
+        testpmd to ensure they match the proper addresses of the TG and SUT nodes. Packets that are
+        sent by testpmd however only check the source mac address and the software packet type.
+        This is because MAC forwarding mode adjusts both addresses, but only the source will belong
+        to the TG or SUT node.
+
+        Args:
+            verbose_out: Parsed testpmd verbose output to collect the noise information from.
+
+        Returns:
+            A tuple containing the total size of received noise in bytes, the number of received
+            noise packets, size of all noise packets sent by testpmd in bytes, and the number of
+            noise packets sent by testpmd.
+        """
+        recv_noise_bytes = 0
+        recv_noise_packets = 0
+        sent_noise_bytes = 0
+        num_sent_packets = 0
+        for verbose_block in verbose_out:
+            for p in verbose_block.packets:
+                if verbose_block.was_received and verbose_block.port_id == self.recv_port:
+                    if (
+                        p.src_mac.lower() != self._tg_port_egress.mac_address.lower()
+                        or p.dst_mac.lower() != self._sut_port_ingress.mac_address.lower()
+                        or "L2_ETHER L3_IPV4" != p.sw_ptype.strip()
+                    ):
+                        recv_noise_bytes += p.length
+                        recv_noise_packets += 1
+                elif not verbose_block.was_received and verbose_block.port_id == self.send_port:
+                    if (
+                        p.src_mac.lower() != self._sut_port_egress.mac_address.lower()
+                        or "L2_ETHER L3_IPV4" != p.sw_ptype.strip()
+                    ):
+                        sent_noise_bytes += p.length
+                        num_sent_packets += 1
+
+        return recv_noise_bytes, recv_noise_packets, sent_noise_bytes, num_sent_packets
+
+    def test_stats_updates(self) -> None:
+        """Send a packet with a fixed length and verify port stats updated properly.
+
+        Send a packet with a total length of `self.total_packet_len` and verify that the rx port
+        only received one packet and the number of rx_bytes increased by exactly
+        `self.total_packet_len`. Also verify that the tx port only sent one packet and that the
+        tx_bytes of the port increase by exactly `self.total_packet_len`.
+
+        Noise on the wire is ignored by extracting the total number of noise packets and the sum of
+        the lengths of those packets and subtracting them from the totals that are provided by the
+        testpmd command `show port info all`.
+
+        Test:
+            Start testpmd in MAC forwarding mode and set verbose mode to 3 (RX and TX).
+            Start packet forwarding and then clear all port statistics.
+            Send a packet, then stop packet forwarding and collect the port stats.
+            Parse verbose info from stopping packet forwarding and verify values in port stats.
+        """
+        with TestPmdShell(self.sut_node, forward_mode=SimpleForwardingModes.mac) as testpmd:
+            testpmd.set_verbose(3)
+            testpmd.start()
+            testpmd.clear_port_stats_all()
+            self.send_packet_and_capture(self.send_pkt)
+            forwarding_output = testpmd.stop()
+            port_stats_all = testpmd.show_port_stats_all()
+            verbose_information = TestPmdShell.extract_verbose_output(forwarding_output)
+
+        # Gather information from irrelevant packets sent/ received on the same port.
+        rx_irr_bytes, rx_irr_pakts, tx_irr_bytes, tx_irr_pakts = self.extract_noise_information(
+            verbose_information
+        )
+        recv_relevant_packets = port_stats_all[self.recv_port].rx_packets - rx_irr_pakts
+        sent_relevant_packets = port_stats_all[self.send_port].tx_packets - tx_irr_pakts
+
+        self.verify(
+            recv_relevant_packets == 1,
+            f"Port {self.recv_port} received {recv_relevant_packets} packets but expected to only "
+            "receive 1.",
+        )
+        self.verify(
+            port_stats_all[self.recv_port].rx_bytes - rx_irr_bytes == self.total_packet_len,
+            f"Number of bytes received by port {self.recv_port} did not match the amount sent.",
+        )
+        self.verify(
+            sent_relevant_packets == 1,
+            f"Number was packets sent by port {self.send_port} was not equal to the number "
+            f"received by port {self.recv_port}.",
+        )
+        self.verify(
+            port_stats_all[self.send_port].tx_bytes - tx_irr_bytes == self.total_packet_len,
+            f"Number of bytes sent by port {self.send_port} did not match the number of bytes "
+            f"received by port {self.recv_port}.",
+        )
-- 
2.45.2

[RFC PATCH v1 3/3] dts: add stats checks to schemai

[jspewock]

From: Jeremy Spewock <jspewock@iol.unh.edu>

Adding the test suite to the yaml schema allows for users to specify it
in their conf.yaml files and run the suite in their test runs.

Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>
---
 dts/framework/config/conf_yaml_schema.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dts/framework/config/conf_yaml_schema.json b/dts/framework/config/conf_yaml_schema.json
index f02a310bb5..8ecfa2a145 100644
--- a/dts/framework/config/conf_yaml_schema.json
+++ b/dts/framework/config/conf_yaml_schema.json
@@ -187,7 +187,8 @@
       "enum": [
         "hello_world",
         "os_udp",
-        "pmd_buffer_scatter"
+        "pmd_buffer_scatter",
+        "port_stats_checks"
       ]
     },
     "test_target": {
-- 
2.45.2