dts: bind to DPDK driver before running tests

Modifies the current process so that we bind to os_driver_for_dpdk from
the configuration file before running test suites and bind back to the
os_driver afterwards. This allows test suites to assume that the ports
are bound to a DPDK supported driver or bind to either driver as needed.

Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>
Acked-by: Patrick Robb <probb@iol.unh.edu>

3 files changed, 39 insertions, 4 deletions

diff --git a/dts/framework/testbed_model/sut_node.py b/dts/framework/testbed_model/sut_node.py
index 202aebfd06..4161d3a4d5 100644
--- a/dts/framework/testbed_model/sut_node.py
+++ b/dts/framework/testbed_model/sut_node.py
@@ -89,6 +89,7 @@ class SutNode(Node):
     _dpdk_version: str | None
     _node_info: NodeInfo | None
     _compiler_version: str | None
+    _path_to_devbind_script: PurePath | None
 
     def __init__(self, node_config: SutNodeConfiguration):
         super(SutNode, self).__init__(node_config)
@@ -105,6 +106,7 @@ class SutNode(Node):
         self._dpdk_version = None
         self._node_info = None
         self._compiler_version = None
+        self._path_to_devbind_script = None
         self._logger.info(f"Created node: {self.name}")
 
     @property
@@ -155,6 +157,14 @@ class SutNode(Node):
                 return ""
         return self._compiler_version
 
+    @property
+    def path_to_devbind_script(self) -> PurePath:
+        if self._path_to_devbind_script is None:
+            self._path_to_devbind_script = self.main_session.join_remote_path(
+                self._remote_dpdk_dir, "usertools", "dpdk-devbind.py"
+            )
+        return self._path_to_devbind_script
+
     def get_build_target_info(self) -> BuildTargetInfo:
         return BuildTargetInfo(
             dpdk_version=self.dpdk_version, compiler_version=self.compiler_version
@@ -176,6 +186,14 @@ class SutNode(Node):
         self._configure_build_target(build_target_config)
         self._copy_dpdk_tarball()
         self._build_dpdk()
+        self.bind_ports_to_driver()
+
+    def _tear_down_build_target(self) -> None:
+        """
+        This method exists to be optionally overwritten by derived classes and
+        is not decorated so that the derived class doesn't have to use the decorator.
+        """
+        self.bind_ports_to_driver(for_dpdk=False)
 
     def _configure_build_target(
         self, build_target_config: BuildTargetConfiguration
@@ -389,3 +407,18 @@ class SutNode(Node):
         return super().create_interactive_shell(
             shell_cls, timeout, privileged, str(eal_parameters)
         )
+
+    def bind_ports_to_driver(self, for_dpdk: bool = True) -> None:
+        """Bind all ports on the SUT to a driver.
+
+        Args:
+            for_dpdk: Boolean that, when True, binds ports to os_driver_for_dpdk
+            or, when False, binds to os_driver. Defaults to True.
+        """
+        for port in self.ports:
+            driver = port.os_driver_for_dpdk if for_dpdk else port.os_driver
+            self.main_session.send_command(
+                f"{self.path_to_devbind_script} -b {driver} --force {port.pci}",
+                privileged=True,
+                verify=True,
+            )
diff --git a/dts/tests/TestSuite_os_udp.py b/dts/tests/TestSuite_os_udp.py
index 9b5f39711d..bf6b93deb5 100644
--- a/dts/tests/TestSuite_os_udp.py
+++ b/dts/tests/TestSuite_os_udp.py
@@ -19,6 +19,8 @@ class TestOSUdp(TestSuite):
             Configure SUT ports and SUT to route traffic from if1 to if2.
         """
 
+        # This test uses kernel drivers
+        self.sut_node.bind_ports_to_driver(for_dpdk=False)
         self.configure_testbed_ipv4()
 
     def test_os_udp(self) -> None:
@@ -43,3 +45,5 @@ class TestOSUdp(TestSuite):
             Remove the SUT port configuration configured in setup.
         """
         self.configure_testbed_ipv4(restore=True)
+        # Assume other suites will likely need dpdk driver
+        self.sut_node.bind_ports_to_driver(for_dpdk=True)
diff --git a/dts/tests/TestSuite_smoke_tests.py b/dts/tests/TestSuite_smoke_tests.py
index 4a269df75b..e8016d1b54 100644
--- a/dts/tests/TestSuite_smoke_tests.py
+++ b/dts/tests/TestSuite_smoke_tests.py
@@ -84,9 +84,7 @@ class SmokeTests(TestSuite):
             Ensure that all drivers listed in the config are bound to the correct
             driver.
         """
-        path_to_devbind = self.sut_node.main_session.join_remote_path(
-            self.sut_node._remote_dpdk_dir, "usertools", "dpdk-devbind.py"
-        )
+        path_to_devbind = self.sut_node.path_to_devbind_script
 
         all_nics_in_dpdk_devbind = self.sut_node.main_session.send_command(
             f"{path_to_devbind} --status | awk '{REGEX_FOR_PCI_ADDRESS}'",
@@ -108,7 +106,7 @@ class SmokeTests(TestSuite):
             # We know this isn't None, but mypy doesn't
             assert devbind_info_for_nic is not None
             self.verify(
-                devbind_info_for_nic.group(1) == nic.os_driver,
+                devbind_info_for_nic.group(1) == nic.os_driver_for_dpdk,
                 f"Driver for device {nic.pci} does not match driver listed in "
                 f"configuration (bound to {devbind_info_for_nic.group(1)})",
             )