selftests: drv-net: Fix and clarify TC bandwidth split in devlink_rate_tc_bw.py

Correct the documented bandwidth distribution between TC3 and TC4
from 80/20 to 20/80. Update test descriptions and printed messages
to consistently reflect the intended split.

Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Nimrod Oren <noren@nvidia.com>
Link: https://patch.msgid.link/20251130091938.4109055-6-cjubran@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: cjubran

tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py

@@ -21,21 +21,21 @@
 ----------
 1. test_no_tc_mapping_bandwidth:
    - Verifies that without TC mapping, bandwidth is NOT distributed according to
-     the configured 80/20 split between TC4 and TC3
-   - This test should fail if bandwidth matches the 80/20 split without TC
+     the configured 20/80 split between TC3 and TC4
+   - This test should fail if bandwidth matches the 20/80 split without TC
      mapping
-   - Expected: Bandwidth should NOT be distributed as 80/20
+   - Expected: Bandwidth should NOT be distributed as 20/80
 
 2. test_tc_mapping_bandwidth:
    - Configures TC mapping using mqprio qdisc
    - Verifies that with TC mapping, bandwidth IS distributed according to the
-     configured 80/20 split between TC3 and TC4
-   - Expected: Bandwidth should be distributed as 80/20
+     configured 20/80 split between TC3 and TC4
+   - Expected: Bandwidth should be distributed as 20/80
 
 Bandwidth Distribution:
 ----------------------
-- TC3 (VLAN 101): Configured for 80% of total bandwidth
-- TC4 (VLAN 102): Configured for 20% of total bandwidth
+- TC3 (VLAN 101): Configured for 20% of total bandwidth
+- TC4 (VLAN 102): Configured for 80% of total bandwidth
 - Total bandwidth: 1Gbps
 - Tolerance: +-12%
 
@@ -402,10 +402,10 @@ def run_bandwidth_distribution_test(cfg, set_tc_mapping):
 
 def test_no_tc_mapping_bandwidth(cfg):
     """
-    Verifies that bandwidth is not split 80/20 without traffic class mapping.
+    Verifies that bandwidth is not split 20/80 without traffic class mapping.
     """
-    pass_bw_msg = "Bandwidth is NOT distributed as 80/20 without TC mapping"
-    fail_bw_msg = "Bandwidth matched 80/20 split without TC mapping"
+    pass_bw_msg = "Bandwidth is NOT distributed as 20/80 without TC mapping"
+    fail_bw_msg = "Bandwidth matched 20/80 split without TC mapping"
     is_mlx5 = "driver: mlx5" in ethtool(f"-i {cfg.ifname}").stdout
 
     if run_bandwidth_distribution_test(cfg, set_tc_mapping=False):
@@ -419,13 +419,13 @@ def test_no_tc_mapping_bandwidth(cfg):
 
 def test_tc_mapping_bandwidth(cfg):
     """
-    Verifies that bandwidth is correctly split 80/20 between TC3 and TC4
+    Verifies that bandwidth is correctly split 20/80 between TC3 and TC4
     when traffic class mapping is set.
     """
     if run_bandwidth_distribution_test(cfg, set_tc_mapping=True):
-        ksft_pr("Bandwidth is distributed as 80/20 with TC mapping")
+        ksft_pr("Bandwidth is distributed as 20/80 with TC mapping")
     else:
-        raise KsftFailEx("Bandwidth did not match 80/20 split with TC mapping")
+        raise KsftFailEx("Bandwidth did not match 20/80 split with TC mapping")
 
 
 def main() -> None: