[PATCH v3 2/7] dts: add waiting for port up in testpmd

[jspewock@iol.unh.edu]

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

Added a method within the testpmd interactive shell that polls the
status of ports and verifies that the link status on a given port is
"up." Polling will continue until either the link comes up, or the
timeout is reached.

Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>
---
 .../remote_session/remote/testpmd_shell.py    | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/dts/framework/remote_session/remote/testpmd_shell.py b/dts/framework/remote_session/remote/testpmd_shell.py
index 1455b5a199..3ea16c7ab3 100644
--- a/dts/framework/remote_session/remote/testpmd_shell.py
+++ b/dts/framework/remote_session/remote/testpmd_shell.py
@@ -1,9 +1,12 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2023 University of New Hampshire
 
+import time
 from pathlib import PurePath
 from typing import Callable
 
+from framework.settings import SETTINGS
+
 from .interactive_shell import InteractiveShell
 
 
@@ -47,3 +50,29 @@ def get_devices(self) -> list[TestPmdDevice]:
             if "device name:" in line.lower():
                 dev_list.append(TestPmdDevice(line))
         return dev_list
+
+    def wait_link_status_up(self, port_id: int, timeout=SETTINGS.timeout) -> bool:
+        """Wait until the link status on the given port is "up".
+
+        Arguments:
+            port_id: Port to check the link status on.
+            timeout: time to wait for the link to come up.
+
+        Returns:
+            If the link came up in time or not.
+        """
+        time_to_stop = time.time() + timeout
+        while time.time() < time_to_stop:
+            port_info = self.send_command(f"show port info {port_id}")
+            if "Link status: up" in port_info:
+                break
+            time.sleep(0.5)
+        else:
+            self._logger.error(
+                f"The link for port {port_id} did not come up in the given timeout."
+            )
+        return "Link status: up" in port_info
+
+    def close(self) -> None:
+        self.send_command("exit", "")
+        return super().close()
-- 
2.42.0