[PATCH v4 5/7] dts: allow configuring MTU of ports

[jspewock@iol.unh.edu]

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

Adds methods in both os_session and linux session to allow for setting
MTU of port interfaces in an OS agnostic way.

Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>
---
 dts/framework/remote_session/linux_session.py | 8 ++++++++
 dts/framework/remote_session/os_session.py    | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/dts/framework/remote_session/linux_session.py b/dts/framework/remote_session/linux_session.py
index fd877fbfae..aaa4d57a36 100644
--- a/dts/framework/remote_session/linux_session.py
+++ b/dts/framework/remote_session/linux_session.py
@@ -177,6 +177,14 @@ def configure_port_ip_address(
             verify=True,
         )
 
+    def configure_port_mtu(self, mtu: int, port: Port) -> None:
+        """Overrides :meth:`~.os_session.OSSession.configure_port_mtu`."""
+        self.send_command(
+            f"ip link set dev {port.logical_name} mtu {mtu}",
+            privileged=True,
+            verify=True,
+        )
+
     def configure_ipv4_forwarding(self, enable: bool) -> None:
         state = 1 if enable else 0
         self.send_command(f"sysctl -w net.ipv4.ip_forward={state}", privileged=True)
diff --git a/dts/framework/remote_session/os_session.py b/dts/framework/remote_session/os_session.py
index 8a709eac1c..cd073f5774 100644
--- a/dts/framework/remote_session/os_session.py
+++ b/dts/framework/remote_session/os_session.py
@@ -277,6 +277,15 @@ def configure_port_ip_address(
         Configure (add or delete) an IP address of the input port.
         """
 
+    @abstractmethod
+    def configure_port_mtu(self, mtu: int, port: Port) -> None:
+        """Configure `mtu` on `port`.
+
+        Args:
+            mtu: Desired MTU value.
+            port: Port to set `mtu` on.
+        """
+
     @abstractmethod
     def configure_ipv4_forwarding(self, enable: bool) -> None:
         """
-- 
2.43.0