selftests: mlxsw: qos_mc_aware: Tweak for min shaper

Since the minimum shaper is now being enabled for MC TCs, it's
unreasonable to expect no UC traffic loss. Minimal min shaper value is
200Mbps, which is 20% of the 1Gbps that this test configures on egress.
To cover for glitches, tolerate up to 25% UC degradation under MC
overload.

Fixes: b5638d46c90a ("selftests: mlxsw: Add a test for UC behavior under MC flood")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh b/tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh
index 0150bb2741eb1a0f2a3c219e7316b37753a17298..a8fc36d670e15dfd5d2ffc005edd39c9b42653d6 100755 (executable)
--- a/tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh
@@ -311,7 +311,7 @@ test_mc_aware()
                        ret = 100 * ($ucth1 - $ucth2) / $ucth1
                        if (ret > 0) { ret } else { 0 }
                    ")
-       check_err $(bc <<< "$deg > 10")
+       check_err $(bc <<< "$deg > 25")
 
        local interval=$((d1 - d0))
        local mc_ir=$(rate $u0 $u1 $interval)