selftests: mlxsw: Add a scale test for physical ports

Query the maximum number of supported physical ports using devlink-resource
and test that this number can be reached by splitting each of the
splittable ports to its width. Test that an error is returned in case
the maximum number is exceeded.

Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/drivers/net/mlxsw/port_scale.sh

@@ -0,0 +1,64 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Test for physical ports resource. The test splits each splittable port
+# to its width and checks that eventually the number of physical ports equals
+# the maximum number of physical ports.
+
+PORT_NUM_NETIFS=0
+
+port_setup_prepare()
+{
+	:
+}
+
+port_cleanup()
+{
+	pre_cleanup
+
+	for port in "${unsplit[@]}"; do
+		devlink port unsplit $port
+		check_err $? "Did not unsplit $netdev"
+	done
+}
+
+split_all_ports()
+{
+	local should_fail=$1; shift
+	local -a unsplit
+
+	# Loop over the splittable netdevs and create tuples of netdev along
+	# with its width. For example:
+	# '$netdev1 $count1 $netdev2 $count2...', when:
+	# $netdev1-2 are splittable netdevs in the device, and
+	# $count1-2 are the netdevs width respectively.
+	while read netdev count <<<$(
+		devlink -j port show |
+		jq -r '.[][] | select(.splittable==true) | "\(.netdev) \(.lanes)"'
+		)
+		[[ ! -z $netdev ]]
+	do
+		devlink port split $netdev count $count
+		check_err $? "Did not split $netdev into $count"
+		unsplit+=( "${netdev}s0" )
+	done
+}
+
+port_test()
+{
+	local max_ports=$1; shift
+	local should_fail=$1; shift
+
+	split_all_ports $should_fail
+
+	occ=$(devlink -j resource show $DEVLINK_DEV \
+	      | jq '.[][][] | select(.name=="physical_ports") |.["occ"]')
+
+	[[ $occ -eq $max_ports ]]
+	if [[ $should_fail -eq 0 ]]; then
+		check_err $? "Mismatch ports number: Expected $max_ports, got $occ."
+	else
+		check_err_fail $should_fail $? "Reached more ports than expected"
+	fi
+
+}

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/port_scale.sh

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+source ../port_scale.sh
+
+port_get_target()
+{
+	local should_fail=$1
+	local target
+
+	target=$(devlink_resource_size_get physical_ports)
+
+	if ((! should_fail)); then
+		echo $target
+	else
+		echo $((target + 1))
+	fi
+}

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/resource_scale.sh

@@ -28,7 +28,7 @@ cleanup()
 
 trap cleanup EXIT
 
-ALL_TESTS="router tc_flower mirror_gre tc_police"
+ALL_TESTS="router tc_flower mirror_gre tc_police port"
 for current_test in ${TESTS:-$ALL_TESTS}; do
 	source ${current_test}_scale.sh
 

tools/testing/selftests/drivers/net/mlxsw/spectrum/port_scale.sh

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+source ../port_scale.sh
+
+port_get_target()
+{
+	local should_fail=$1
+	local target
+
+	target=$(devlink_resource_size_get physical_ports)
+
+	if ((! should_fail)); then
+		echo $target
+	else
+		echo $((target + 1))
+	fi
+}

tools/testing/selftests/drivers/net/mlxsw/spectrum/resource_scale.sh

@@ -22,7 +22,7 @@ cleanup()
 devlink_sp_read_kvd_defaults
 trap cleanup EXIT
 
-ALL_TESTS="router tc_flower mirror_gre tc_police"
+ALL_TESTS="router tc_flower mirror_gre tc_police port"
 for current_test in ${TESTS:-$ALL_TESTS}; do
 	source ${current_test}_scale.sh