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
Signed-off-by: Jakub Kicinski kuba@kernel.org --- v2: - move up / down to the test - add helper for getting pp - add busy_wait helper - rename undeteched --- tools/testing/selftests/net/lib/py/ksft.py | 12 ++++ tools/testing/selftests/net/lib/py/nsim.py | 1 + tools/testing/selftests/net/nl_netdev.py | 76 +++++++++++++++++++++- 3 files changed, 87 insertions(+), 2 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 @@ KSFT_RESULT = None _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 @@ from .utils import cmd, ip 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) diff --git a/tools/testing/selftests/net/nl_netdev.py b/tools/testing/selftests/net/nl_netdev.py index 2b8b488fb419..6909b1760739 100755 --- a/tools/testing/selftests/net/nl_netdev.py +++ b/tools/testing/selftests/net/nl_netdev.py @@ -1,7 +1,9 @@ #!/usr/bin/env python3 # SPDX-License-Identifier: GPL-2.0
-from lib.py import ksft_run, ksft_pr, ksft_eq, ksft_ge, NetdevFamily +import time +from lib.py import ksft_run, ksft_pr, ksft_eq, ksft_ge, ksft_busy_wait +from lib.py import NetdevFamily, NetdevSimDev, ip
def empty_check(nf) -> None: @@ -15,9 +17,79 @@ from lib.py import ksft_run, ksft_pr, ksft_eq, ksft_ge, NetdevFamily 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], args=(nf, )) + ksft_run([empty_check, lo_check, page_pool_check], + args=(nf, ))
if __name__ == "__main__":