selftests: net: exercise page pool reporting via netlink

Add a Python test for the basic ops.

  # ./net/nl_netdev.py
  KTAP version 1
  1..3
  ok 1 nl_netdev.empty_check
  ok 2 nl_netdev.lo_check
  ok 3 nl_netdev.page_pool_check
  # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0

Reviewed-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/20240412141436.828666-7-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 13 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/lib/py/ksft.py b/tools/testing/selftests/net/lib/py/ksft.py
index 793e4761645e..3769b9197213 100644
--- a/tools/testing/selftests/net/lib/py/ksft.py
+++ b/tools/testing/selftests/net/lib/py/ksft.py
@@ -2,6 +2,7 @@
 
 import builtins
 import inspect
+import time
 import traceback
 from .consts import KSFT_MAIN_NAME
 
@@ -50,6 +51,17 @@ def ksft_ge(a, b, comment=""):
         _fail("Check failed", a, "<", b, comment)
 
 
+def ksft_busy_wait(cond, sleep=0.005, deadline=1, comment=""):
+    end = time.monotonic() + deadline
+    while True:
+        if cond():
+            return
+        if time.monotonic() > end:
+            _fail("Waiting for condition timed out", comment)
+            return
+        time.sleep(sleep)
+
+
 def ktap_result(ok, cnt=1, case="", comment=""):
     res = ""
     if not ok:
diff --git a/tools/testing/selftests/net/lib/py/nsim.py b/tools/testing/selftests/net/lib/py/nsim.py
index 94aa32f59fdb..06896cdf7c18 100644
--- a/tools/testing/selftests/net/lib/py/nsim.py
+++ b/tools/testing/selftests/net/lib/py/nsim.py
@@ -28,6 +28,7 @@ class NetdevSim:
         self.dfs_dir = "%s/ports/%u/" % (nsimdev.dfs_dir, port_index)
         ret = ip("-j link show dev %s" % ifname, ns=ns)
         self.dev = json.loads(ret.stdout)[0]
+        self.ifindex = self.dev["ifindex"]
 
     def dfs_write(self, path, val):
         self.nsimdev.dfs_write(f'ports/{self.port_index}/' + path, val)