Add a selftest that verifies symmetric RSS hash is working as intended.
The test runs two iterations of iperf3 traffic, swapping the src/dst TCP
ports, and verifies that the same RX queue is receiving the traffic in
both cases.
Reviewed-by: Nimrod Oren <noren@xxxxxxxxxx>
Signed-off-by: Gal Pressman <gal@xxxxxxxxxx>
---
.../testing/selftests/drivers/net/hw/Makefile | 1 +
.../drivers/net/hw/rss_input_xfrm.py | 77 +++++++++++++++++++
.../selftests/drivers/net/lib/py/load.py | 7 +-
3 files changed, 83 insertions(+), 2 deletions(-)
create mode 100755 tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py
diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
index 21ba64ce1e34..23dca086f84f 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -15,6 +15,7 @@ TEST_PROGS = \
nic_performance.py \
pp_alloc_fail.py \
rss_ctx.py \
+ rss_input_xfrm.py \
#
TEST_FILES := \
diff --git a/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py b/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py
new file mode 100755
index 000000000000..e32df852f091
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_pr
+from lib.py import NetDrvEpEnv
+from lib.py import EthtoolFamily, NetdevFamily
+from lib.py import KsftSkipEx
+from lib.py import rand_port, check_port_available_remote
+from lib.py import GenerateTraffic
+from rss_ctx import _get_rx_cnts
+
+
+def _get_active_rx_queue(cnts):
+ return cnts.index(max(cnts))
+
+
+def _get_rand_port(remote):
+ for _ in range(1000):
+ port = rand_port()
+ try:
+ check_port_available_remote(port, remote)
+ return port
+ except:
+ continue
+
+ raise Exception("Can't find any free unprivileged port")
+
+
+def test_rss_input_xfrm(cfg):
+ """
+ Test symmetric input_xfrm.
+ If symmetric RSS hash is configured, send traffic twice, swapping the
+ src/dst TCP ports, and verify that the same queue is receiving the traffic
+ in both cases (IPs are constant).
+ """
+
+ input_xfrm = cfg.ethnl.rss_get(
+ {'header': {'dev-name': cfg.ifname}}).get('input_xfrm')
+
+ # Check for symmetric xor/or-xor
+ if input_xfrm and (input_xfrm == 1 or input_xfrm == 2):
+ port1 = _get_rand_port(cfg.remote)
+ port2 = _get_rand_port(cfg.remote)
+ ksft_pr(f'Running traffic on ports: {port1 = }, {port2 = }')
+
+ cnts = _get_rx_cnts(cfg)
+ GenerateTraffic(cfg, port=port1, parallel=1,
+ cport=port2).wait_pkts_and_stop(20000)
+ cnts = _get_rx_cnts(cfg, prev=cnts)
+ rxq1 = _get_active_rx_queue(cnts)
+ ksft_pr(f'Received traffic on {rxq1 = }')
+
+ cnts = _get_rx_cnts(cfg)
+ GenerateTraffic(cfg, port=port2, parallel=1,
+ cport=port1).wait_pkts_and_stop(20000)
+ cnts = _get_rx_cnts(cfg, prev=cnts)
+ rxq2 = _get_active_rx_queue(cnts)
+ ksft_pr(f'Received traffic on {rxq2 = }')
+
+ ksft_eq(
+ rxq1, rxq2, comment=f"Received traffic on different queues ({rxq1} != {rxq2}) while symmetric hash is configured")
+ else:
+ raise KsftSkipEx("Symmetric RSS hash not requested")
+
+
+def main() -> None:
+ with NetDrvEpEnv(__file__, nsim_test=False) as cfg:
+ cfg.ethnl = EthtoolFamily()
+ cfg.netdevnl = NetdevFamily()
+
+ ksft_run([test_rss_input_xfrm],
+ args=(cfg, ))
+ ksft_exit()
+
+
+if __name__ == "__main__":
+ main()
diff --git a/tools/testing/selftests/drivers/net/lib/py/load.py b/tools/testing/selftests/drivers/net/lib/py/load.py
index da5af2c680fa..76aaa65c0367 100644
--- a/tools/testing/selftests/drivers/net/lib/py/load.py
+++ b/tools/testing/selftests/drivers/net/lib/py/load.py
@@ -5,7 +5,7 @@ import time
from lib.py import ksft_pr, cmd, ip, rand_port, wait_port_listen, bkg
class GenerateTraffic:
- def __init__(self, env, port=None):
+ def __init__(self, env, port=None, cport=None, parallel=16):
env.require_cmd("iperf3", remote=True)
self.env = env
@@ -15,7 +15,10 @@ class GenerateTraffic:
self._iperf_server = cmd(f"iperf3 -s -1 -p {port}", background=True)
wait_port_listen(port)
time.sleep(0.1)
- self._iperf_client = cmd(f"iperf3 -c {env.addr} -P 16 -p {port} -t 86400",
+ client_cmd = f"iperf3 -c {env.addr} -P {parallel} -p {port} -t 86400"
+ if cport and parallel == 1:
+ client_cmd = f"{client_cmd} --cport {cport}"
+ self._iperf_client = cmd(client_cmd,
background=True, host=env.remote)
# Wait for traffic to ramp up
--
2.40.1
