A few packets may still be sent out during the termination of iperf processes. These late packets cause failures in rss_ctx.py when they arrive on queues expected to be empty.

Example failure observed:

Check failed 2 != 0 traffic on inactive queues (context 1): [0, 0, 1, 1, 386385, 397196, 0, 0, 0, 0, ...]

Check failed 4 != 0 traffic on inactive queues (context 2): [0, 0, 0, 0, 2, 2, 247152, 253013, 0, 0, ...]

Check failed 2 != 0 traffic on inactive queues (context 3): [0, 0, 0, 0, 0, 0, 1, 1, 282434, 283070, ...]

To avoid such failures, wait until all client sockets for the requested port are either closed or in the TIME_WAIT state.

Fixes: 847aa551fa78 ("selftests: drv-net: rss_ctx: factor out send traffic and check") Signed-off-by: Nimrod Oren noren@nvidia.com Reviewed-by: Gal Pressman gal@nvidia.com Reviewed-by: Carolina Jubran cjubran@nvidia.com --- Changelog: v2: - Replace fixed sleep with logic that waits for client sockets to close. - Update commit title and message to reflect new approach. v1: https://lore.kernel.org/all/20250629111812.644282-1-noren@nvidia.com/ --- .../selftests/drivers/net/lib/py/load.py | 23 +++++++++++++++---- 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/lib/py/load.py b/tools/testing/selftests/drivers/net/lib/py/load.py index d9c10613ae67..44151b7b1a24 100644 --- a/tools/testing/selftests/drivers/net/lib/py/load.py +++ b/tools/testing/selftests/drivers/net/lib/py/load.py @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0

+import re import time

from lib.py import ksft_pr, cmd, ip, rand_port, wait_port_listen @@ -10,12 +11,11 @@ class GenerateTraffic:

self.env = env

- if port is None: - port = rand_port() - self._iperf_server = cmd(f"iperf3 -s -1 -p {port}", background=True) - wait_port_listen(port) + self.port = rand_port() if port is None else port + self._iperf_server = cmd(f"iperf3 -s -1 -p {self.port}", background=True) + wait_port_listen(self.port) time.sleep(0.1) - self._iperf_client = cmd(f"iperf3 -c {env.addr} -P 16 -p {port} -t 86400", + self._iperf_client = cmd(f"iperf3 -c {env.addr} -P 16 -p {self.port} -t 86400", background=True, host=env.remote)

# Wait for traffic to ramp up @@ -56,3 +56,16 @@ class GenerateTraffic: ksft_pr(">> Server:") ksft_pr(self._iperf_server.stdout) ksft_pr(self._iperf_server.stderr) + self._wait_client_stopped() + + def _wait_client_stopped(self, sleep=0.005, timeout=5): + end = time.monotonic() + timeout + + live_port_pattern = re.compile(fr":{self.port:04X} 0[^6] ") + + while time.monotonic() < end: + data = cmd("cat /proc/net/tcp*", host=self.env.remote).stdout + if not live_port_pattern.search(data): + return + time.sleep(sleep) + raise Exception(f"Waiting for client to stop timed out after {timeout}s")