[PATCH net-next] selftests: drv-net: rss: Fix error calculation in test_hitless_key_update

[Dimitri Daskalakis]

This test verifies there are no errors when a devices RSS key is updated
while traffic is flowing. The current check is a no-op since the last
sample was subtracted from itself.

Fixes: 933048fec4dd ("selftests: drv-net: rss_ctx: test flow rehashing without 
impacting traffic")
Signed-off-by: Dimitri Daskalakis <dimitri.daskalak...@gmail.com>
---
 tools/testing/selftests/drivers/net/hw/rss_ctx.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/drivers/net/hw/rss_ctx.py 
b/tools/testing/selftests/drivers/net/hw/rss_ctx.py
index 97246eab863a..d7cb30306368 100755
--- a/tools/testing/selftests/drivers/net/hw/rss_ctx.py
+++ b/tools/testing/selftests/drivers/net/hw/rss_ctx.py
@@ -357,7 +357,7 @@ def test_hitless_key_update(cfg):
         tgen.wait_pkts_and_stop(5000)
 
     ksft_lt((t1 - t0).total_seconds(), 0.15)
-    ksft_eq(errors1 - errors1, 0)
+    ksft_eq(errors1 - errors0, 0)
     ksft_eq(carrier1 - carrier0, 0)
 
 
-- 
2.47.3