[PATCH net-next] selftests: drv-net: rss_input_xfrm: Check test prerequisites before running

[Gal Pressman <gal@nvidia.com>]

Ensure the following prerequisites before executing the test:
1. 'socat' is installed on the remote host.
2. Python version supports socket.SO_INCOMING_CPU (available since v3.11).

Skip the test if either prerequisite is not met.

Reviewed-by: Nimrod Oren <noren@nvidia.com>
Signed-off-by: Gal Pressman <gal@nvidia.com>
---
 .../testing/selftests/drivers/net/hw/rss_input_xfrm.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py b/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py
index 53bb08cc29ec..58d74ba6c343 100755
--- a/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py
+++ b/tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py
@@ -7,7 +7,7 @@ from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_ge, cmd, fd_read_timeout
 from lib.py import NetDrvEpEnv
 from lib.py import EthtoolFamily, NetdevFamily
 from lib.py import KsftSkipEx, KsftFailEx
-from lib.py import rand_port
+from lib.py import rand_port, CmdExitFailure
 
 
 def traffic(cfg, local_port, remote_port, ipver):
@@ -32,6 +32,14 @@ def test_rss_input_xfrm(cfg, ipver):
     if multiprocessing.cpu_count() < 2:
         raise KsftSkipEx("Need at least two CPUs to test symmetric RSS hash")
 
+    try:
+        cmd("hash socat", host=cfg.remote)
+    except CmdExitFailure:
+        raise KsftSkipEx("socat not installed on remote")
+
+    if not hasattr(socket, "SO_INCOMING_CPU"):
+        raise KsftSkipEx("socket.SO_INCOMING_CPU was added in Python 3.11")
+
     input_xfrm = cfg.ethnl.rss_get(
         {'header': {'dev-name': cfg.ifname}}).get('input_xfrm')
 
-- 
2.40.1