selftests: mlxsw: tc_restrictions: Fix test failure with new iproute2

As explained in [1], iproute2 started rejecting tc-police burst sizes
that result in an overflow. This can happen when the burst size is high
enough and the rate is low enough.

A couple of test cases specify such configurations, resulting in
iproute2 errors and test failure.

Fix by reducing the burst size so that the test will pass with both new
and old iproute2 versions.

[1] https://lore.kernel.org/netdev/20250916215731.3431465-1-jay.vosburgh@canonical.com/

Fixes: cb12d1763267 ("selftests: mlxsw: tc_restrictions: Test tc-police restrictions")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/88b00c6e85188aa6a065dc240206119b328c46e1.1770643998.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/drivers/net/mlxsw/tc_restrictions.sh b/tools/testing/selftests/drivers/net/mlxsw/tc_restrictions.sh
index 0441a18f098b10f45a08aa48b91a42e3f15488df..aac8ef490feb80049aa5b6da9c84d5b42a56438f 100755 (executable)
--- a/tools/testing/selftests/drivers/net/mlxsw/tc_restrictions.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/tc_restrictions.sh
@@ -317,7 +317,7 @@ police_limits_test()
 
        tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
                flower skip_sw \
-               action police rate 0.5kbit burst 1m conform-exceed drop/ok
+               action police rate 0.5kbit burst 2k conform-exceed drop/ok
        check_fail $? "Incorrect success to add police action with too low rate"
 
        tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
@@ -327,7 +327,7 @@ police_limits_test()
 
        tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
                flower skip_sw \
-               action police rate 1.5kbit burst 1m conform-exceed drop/ok
+               action police rate 1.5kbit burst 2k conform-exceed drop/ok
        check_err $? "Failed to add police action with low rate"
 
        tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower