Add a selftest that verifies symmetric RSS hash is working as intended.
The test runs iterations of traffic, swapping the src/dst UDP 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 | 85 +++++++++++++++++++
2 files changed, 86 insertions(+)
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 ae783e18be83..fb1b655b4939 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -16,6 +16,7 @@ TEST_PROGS = \
pp_alloc_fail.py \
rss_ctx.py \
tso.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..c0e7eb87533f
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import socket
+from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_ge, cmd
+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
+
+
+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 traffic(cfg, local_port, remote_port, ipver):
+ af_inet = socket.AF_INET if ipver == "4" else socket.AF_INET6
+ sock = socket.socket(af_inet, socket.SOCK_DGRAM)
+ sock.bind(('', local_port))
+ sock.connect((cfg.remote_addr_v[ipver], remote_port))
+ tgt = f"{ipver}:[{cfg.addr_v[ipver]}]:{local_port},sourceport={remote_port}"
+ cmd("echo a | socat - UDP" + tgt, host=cfg.remote)
+ sock.recvmsg(100)
+ return sock.getsockopt(socket.SOL_SOCKET, socket.SO_INCOMING_CPU)
+
+
+def test_rss_input_xfrm(cfg, ipver):
+ """
+ Test symmetric input_xfrm.
+ If symmetric RSS hash is configured, send traffic twice, swapping the
+ src/dst UDP 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):
+ cpus = set()
+ for _ in range(8):
+ port1 = _get_rand_port(cfg.remote)
+ port2 = _get_rand_port(cfg.remote)
+ cpu1 = traffic(cfg, port1, port2, ipver)
+ cpu2 = traffic(cfg, port2, port1, ipver)
+ cpus.update([cpu1, cpu2])
+
+ ksft_eq(
+ cpu1, cpu2, comment=f"Received traffic on different cpus ({cpu1} != {cpu2}) with ports ({port1 = }, {port2 = }) while symmetric hash is configured")
+
+ ksft_ge(len(cpus), 2, comment=f"Received traffic on less than two cpus")
+ else:
+ raise KsftSkipEx("Symmetric RSS hash not requested")
+
+
+def test_rss_input_xfrm_ipv4(cfg):
+ cfg.require_ipver("4")
+ test_rss_input_xfrm(cfg, "4")
+
+
+def test_rss_input_xfrm_ipv6(cfg):
+ cfg.require_ipver("6")
+ test_rss_input_xfrm(cfg, "6")
+
+
+def main() -> None:
+ with NetDrvEpEnv(__file__, nsim_test=False) as cfg:
+ cfg.ethnl = EthtoolFamily()
+ cfg.netdevnl = NetdevFamily()
+
+ ksft_run([test_rss_input_xfrm_ipv4, test_rss_input_xfrm_ipv6],
+ args=(cfg, ))
+ ksft_exit()
+
+
+if __name__ == "__main__":
+ main()
--
2.40.1
