tests: add iproute2 API guard to svd test

Add a iproute2 API guard to the SVD test using `bridge fdb get`.

While it SHOULD be present on most systems based on their kernel
version it may not be present due to kernel/iproute2 version mismatch
weirdness.

Signed-off-by: Stephen Worley <sworley@nvidia.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/topotests/lib/topotest.py b/tests/topotests/lib/topotest.py
index 7f68b4ccf3..699b53303a 100644
--- a/tests/topotests/lib/topotest.py
+++ b/tests/topotests/lib/topotest.py
@@ -595,6 +595,29 @@ def iproute2_is_vrf_capable():
             pass
     return False
 
+def iproute2_is_fdb_get_capable():
+    """
+    Checks if the iproute2 version installed on the system is capable of
+    handling `bridge fdb get` commands to query neigh table resolution.
+
+    Returns True if capability can be detected, returns False otherwise.
+    """
+
+    if is_linux():
+        try:
+            subp = subprocess.Popen(
+                ["bridge", "fdb", "get", "help"],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+                stdin=subprocess.PIPE,
+            )
+            iproute2_out = subp.communicate()[1].splitlines()[0].split()[0]
+
+            if "Usage" in str(iproute2_out):
+                return True
+        except Exception:
+            pass
+    return False
 
 def module_present_linux(module, load):
     """