1 files changed, 98 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/nl_netdev.py b/tools/testing/selftests/net/nl_netdev.py
new file mode 100755
index 000000000000..93d9d914529b
--- /dev/null
+++ b/tools/testing/selftests/net/nl_netdev.py
@@ -0,0 +1,98 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import time
+from lib.py import ksft_run, ksft_exit, ksft_pr
+from lib.py import ksft_eq, ksft_ge, ksft_busy_wait
+from lib.py import NetdevFamily, NetdevSimDev, ip
+
+
+def empty_check(nf) -> None:
+    devs = nf.dev_get({}, dump=True)
+    ksft_ge(len(devs), 1)
+
+
+def lo_check(nf) -> None:
+    lo_info = nf.dev_get({"ifindex": 1})
+    ksft_eq(len(lo_info['xdp-features']), 0)
+    ksft_eq(len(lo_info['xdp-rx-metadata-features']), 0)
+
+
+def page_pool_check(nf) -> None:
+    with NetdevSimDev() as nsimdev:
+        nsim = nsimdev.nsims[0]
+
+        def up():
+            ip(f"link set dev {nsim.ifname} up")
+
+        def down():
+            ip(f"link set dev {nsim.ifname} down")
+
+        def get_pp():
+            pp_list = nf.page_pool_get({}, dump=True)
+            return [pp for pp in pp_list if pp.get("ifindex") == nsim.ifindex]
+
+        # No page pools when down
+        down()
+        ksft_eq(len(get_pp()), 0)
+
+        # Up, empty page pool appears
+        up()
+        pp_list = get_pp()
+        ksft_ge(len(pp_list), 0)
+        refs = sum([pp["inflight"] for pp in pp_list])
+        ksft_eq(refs, 0)
+
+        # Down, it disappears, again
+        down()
+        pp_list = get_pp()
+        ksft_eq(len(pp_list), 0)
+
+        # Up, allocate a page
+        up()
+        nsim.dfs_write("pp_hold", "y")
+        pp_list = nf.page_pool_get({}, dump=True)
+        refs = sum([pp["inflight"] for pp in pp_list if pp.get("ifindex") == nsim.ifindex])
+        ksft_ge(refs, 1)
+
+        # Now let's leak a page
+        down()
+        pp_list = get_pp()
+        ksft_eq(len(pp_list), 1)
+        refs = sum([pp["inflight"] for pp in pp_list])
+        ksft_eq(refs, 1)
+        attached = [pp for pp in pp_list if "detach-time" not in pp]
+        ksft_eq(len(attached), 0)
+
+        # New pp can get created, and we'll have two
+        up()
+        pp_list = get_pp()
+        attached = [pp for pp in pp_list if "detach-time" not in pp]
+        detached = [pp for pp in pp_list if "detach-time" in pp]
+        ksft_eq(len(attached), 1)
+        ksft_eq(len(detached), 1)
+
+        # Free the old page and the old pp is gone
+        nsim.dfs_write("pp_hold", "n")
+        # Freeing check is once a second so we may need to retry
+        ksft_busy_wait(lambda: len(get_pp()) == 1, deadline=2)
+
+        # And down...
+        down()
+        ksft_eq(len(get_pp()), 0)
+
+        # Last, leave the page hanging for destroy, nothing to check
+        # we're trying to exercise the orphaning path in the kernel
+        up()
+        nsim.dfs_write("pp_hold", "y")
+
+
+def main() -> None:
+    nf = NetdevFamily()
+    ksft_run([empty_check, lo_check, page_pool_check],
+             args=(nf, ))
+    ksft_exit()
+
+
+if __name__ == "__main__":
+    main()