[PATCH] dts: add dpdk shell warm up period

[Patrick Robb <probb@iol.unh.edu>]

When running our existing DTS testsuites on a new
NIC we observed packets would not transmit from
the traffic generator to the system under test
even after DPDK testpmd and the NIC under test
had indicated readiness through the existing
readiness checks in DTS. After adding in a warm up
sleep to DPDK shells, this issue was resolved.
Correctness is more important than execution
speed in DTS, so it seems justified to slow down
the execution a little in order to make the
testing framework less fragile to such device
specific bringup behaviors.

Signed-off-by: Patrick Robb <probb@iol.unh.edu>
---
 dts/framework/remote_session/dpdk_shell.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/dts/framework/remote_session/dpdk_shell.py b/dts/framework/remote_session/dpdk_shell.py
index d4aa02f39b..b0868d32fb 100644
--- a/dts/framework/remote_session/dpdk_shell.py
+++ b/dts/framework/remote_session/dpdk_shell.py
@@ -6,9 +6,12 @@
 Provides a base class to create interactive shells based on DPDK.
 """
 
+import time
 from abc import ABC, abstractmethod
 from pathlib import PurePath
 
+from typing_extensions import Self
+
 from framework.context import get_ctx
 from framework.params.eal import EalParams
 from framework.remote_session.interactive_shell import (
@@ -84,3 +87,9 @@ def _make_real_path(self):
         Adds the remote DPDK build directory to the path.
         """
         return get_ctx().dpdk_build.remote_dpdk_build_dir.joinpath(self.path)
+
+    def __enter__(self) -> Self:
+        """Overrides :meth:`~.interactive_shell.InteractiveShell.__enter__`."""
+        super().__enter__()
+        time.sleep(5)
+        return self
-- 
2.49.0