My apologies about the formatting, gmail wasn't playing nice with sending
the patch as a thread.

On Mon, Jun 29, 2020 at 11:59 AM Owen Hilyard <ohilyard@iol.unh.edu> wrote:

> add a test case which tries to set the mtu to several invalid values
> add documented for aformentioned test case.
>
> Signed-off-by: Owen Hilyard <ohilyard@iol.unh.edu>
> ---
>  test_plans/mtu_update_test_plan.rst |  6 ++++
>  tests/TestSuite_mtu_update.py       | 43 ++++++++++++++++++++---------
>  2 files changed, 36 insertions(+), 13 deletions(-)
>
> diff --git a/test_plans/mtu_update_test_plan.rst
> b/test_plans/mtu_update_test_plan.rst
> index b62ec15..70e5c04 100644
> --- a/test_plans/mtu_update_test_plan.rst
> +++ b/test_plans/mtu_update_test_plan.rst
> @@ -152,3 +152,9 @@ Send a packet with size 1600 bytes ::
>
>  ############################################################################
>
>  Verify that TX-bytes on port 0 and RX-bytes on port 1 are 1500
> +
> +Test Case: MTU Checks Invalid Values
> +=====================================
> +This test case consists of attempting to set the MTU of ports to invalid
> +values through TestPmd. Values include the range [0, 63], -1, 2 ^ 128,
> +strings_should't_work, 1.2, a null character and 10000.
> diff --git a/tests/TestSuite_mtu_update.py b/tests/TestSuite_mtu_update.py
> index 6e425dc..0547494 100644
> --- a/tests/TestSuite_mtu_update.py
> +++ b/tests/TestSuite_mtu_update.py
> @@ -34,25 +34,14 @@
>  DPDK Test suite.
>  MTU Checks example.
>  """
> -import os
> -import subprocess
>  from time import sleep
> -from typing import List, Tuple
> +from typing import Tuple
>
> -import utils
>  from pmd_output import PmdOutput
> -from test_case import TestCase
> -
> -from pktgen_base import TRANSMIT_S_BURST
>
>  import utils
> -import re
>  import time
>  from test_case import TestCase
> -from pktgen import TRANSMIT_CONT
> -
> -from framework.packet import Packet
> -from framework.settings import HEADER_SIZE
>
>  ETHER_HEADER_LEN = 18
>  IP_HEADER_LEN = 20
> @@ -112,7 +101,6 @@ class TestMtuUpdate(TestCase):
>                                       f'Ether(dst=dutmac,
> src="52:00:00:00:00:00")/IP()/Raw(load="\x50"*{padding})')
>          return out
>
> -
>      def send_packet_of_size_to_tx_port(self, pktsize, received=True):
>          """
>          Send 1 packet to portid
> @@ -185,6 +173,12 @@ class TestMtuUpdate(TestCase):
>          clear up.
>          """
>          self.dut.kill_all()
> +        self.pmdout.start_testpmd("Default")
> +        self.exec("port stop all")
> +        for port in self.dut_ports:
> +            self.exec(f"port config mtu {port} 1500")
> +        self.exec("port start all")
> +        self.pmdout.quit()
>
>      def admin_tester_port(self, local_port, status):
>          """
> @@ -208,6 +202,7 @@ class TestMtuUpdate(TestCase):
>          @return: None
>          """
>          self.admin_tester_port(self.tester.get_local_port(self.tx_port),
> f"mtu {mtu:d}")
> +
>      #
>      #
>      #
> @@ -264,3 +259,25 @@ class TestMtuUpdate(TestCase):
>           then being sent packets of size 8999 and 9000.
>          """
>          self.helper_test_mut_checks(9000)
> +
> +    def test_mtu_checks_invalid_values(self):
> +        """
> +        Checks that invalid arguments are rejected.
> +        """
> +        self.pmdout.start_testpmd("Default")
> +        self.exec("port stop all")
> +        for port in self.dut_ports:
> +            self.exec(f"port config mtu {port} 1500")
> +            for invalid_arg in -1, 2 ** 128, "strings_should't_work",
> 1.2, '\0':
> +                self.verify("Bad arguments" in self.exec(f"port config
> mtu {port :d} {invalid_arg}"),
> +                            f"MTU {invalid_arg} was accepted when it
> shouldn't have been.")
> +                mtu: int =
> int(self.pmdout.get_detail_from_port_info("MTU: ", "\d+", port))
> +            for to_low_arg in range(0, 64):
> +                self.verify("mtu cannot be less than 64" in
> self.exec(f"port config mtu {port :d} {to_low_arg}"),
> +                            f"MTU {to_low_arg} was accepted when it
> shouldn't have been.")
> +            # Check 10000, which should barely be to high for most NICS
> +            self.verify("is not in valid range" in self.exec(f"port
> config mtu {port :d} 10000"),
> +                        f"MTU 10000 was accepted when it shouldn't have
> been.")
> +
> +        self.exec("port start all")
> +        self.pmdout.quit()
> --
> 2.25.1
>
>