[PATCH 5.4 166/222] selftests: mlxsw: qos_mc_aware: Fix mausezahn invocation

Greg Kroah-Hartman
2020-01-22T13:25:12Z

From: Petr Machata <petrm@mellanox.com>

commit fef6d6704944c7be72fd2b77c021f1aed3d5df0d upstream.

Mausezahn does not recognize "own" as a keyword on source IP address. As a
result, the MC stream is not running at all, and therefore no UC
degradation can be observed even in principle.

Fix the invocation, and tighten the test: due to the minimum shaper
configured at the MC TCs, we always expect about 20% degradation. Fail the
test if it is lower.

Fixes: 573363a68f27 ("selftests: mlxsw: Add qos_lib.sh")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reported-by: Amit Cohen <amitc@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh
@@ -232,7 +232,7 @@ test_mc_aware()
stop_traffic
local ucth1=${uc_rate[1]}

- start_traffic $h1 own bc bc
+ start_traffic $h1 192.0.2.65 bc bc

local d0=$(date +%s)
local t0=$(ethtool_stats_get $h3 rx_octets_prio_0)
@@ -254,7 +254,11 @@ test_mc_aware()
ret = 100 * ($ucth1 - $ucth2) / $ucth1
if (ret > 0) { ret } else { 0 }
")
- check_err $(bc <<< "$deg > 25")
+
+ # Minimum shaper of 200Mbps on MC TCs should cause about 20% of
+ # degradation on 1Gbps link.
+ check_err $(bc <<< "$deg < 15") "Minimum shaper not in effect"
+ check_err $(bc <<< "$deg > 25") "MC traffic degrades UC performance too much"

local interval=$((d1 - d0))
local mc_ir=$(rate $u0 $u1 $interval)