netdev - [PATCH net-next 11/11] selftests: spectrum-2: tc_flower

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Date:   Thu, 16 Jun 2022 13:42:45 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, petrm@...dia.com, amcohen@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 11/11] selftests: spectrum-2: tc_flower_scale: Dynamically set scale target

Instead of hard coding the scale target in the test, dynamically set it
based on the maximum number of flow counters and their current
occupancy.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Petr Machata <petrm@...dia.com>
---
 .../net/mlxsw/spectrum-2/tc_flower_scale.sh       | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/mlxsw/spectrum-2/tc_flower_scale.sh b/tools/testing/selftests/drivers/net/mlxsw/spectrum-2/tc_flower_scale.sh
index efd798a85931..4444bbace1a9 100644
--- a/tools/testing/selftests/drivers/net/mlxsw/spectrum-2/tc_flower_scale.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/spectrum-2/tc_flower_scale.sh
@@ -4,17 +4,22 @@ source ../tc_flower_scale.sh
 tc_flower_get_target()
 {
 	local should_fail=$1; shift
+	local max_cnts
 
 	# The driver associates a counter with each tc filter, which means the
 	# number of supported filters is bounded by the number of available
 	# counters.
-	# Currently, the driver supports 30K (30,720) flow counters and six of
-	# these are used for multicast routing.
-	local target=30714
+	max_cnts=$(devlink_resource_size_get counters flow)
+
+	# Remove already allocated counters.
+	((max_cnts -= $(devlink_resource_occ_get counters flow)))
+
+	# Each rule uses two counters, for packets and bytes.
+	((max_cnts /= 2))
 
 	if ((! should_fail)); then
-		echo $target
+		echo $max_cnts
 	else
-		echo $((target + 1))
+		echo $((max_cnts + 1))
 	fi
 }
-- 
2.36.1