Merge branch 'ksz-dcb-dscp'

Oleksij Rempel says:

====================
add DCB and DSCP support for KSZ switches

This patch series is aimed at improving support for DCB (Data Center
Bridging) and DSCP (Differentiated Services Code Point) on KSZ switches.

The main goal is to introduce global DSCP and PCP (Priority Code Point)
mapping support, addressing the limitation of KSZ switches not having
per-port DSCP priority mapping. This involves extending the DSA
framework with new callbacks for managing trust settings for global DSCP
and PCP maps. Additionally, we introduce IEEE 802.1q helpers for default
configurations, benefiting other drivers too.

Change logs are in separate patches.

Compared to v6 this series includes some new patches for DSCP global
mapping support and QoS selftest script for KSZ9477 switches.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 668 insertions, 0 deletions

diff --git a/tools/testing/selftests/drivers/net/microchip/ksz9477_qos.sh b/tools/testing/selftests/drivers/net/microchip/ksz9477_qos.sh
new file mode 100755
index 000000000000..82be5d013330
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/microchip/ksz9477_qos.sh
@@ -0,0 +1,668 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
+
+# The script is adopted to work with the Microchip KSZ switch driver.
+
+ETH_FCS_LEN=4
+
+WAIT_TIME=1
+NUM_NETIFS=4
+REQUIRE_JQ="yes"
+REQUIRE_MZ="yes"
+STABLE_MAC_ADDRS=yes
+NETIF_CREATE=no
+lib_dir=$(dirname $0)/../../../net/forwarding
+source $lib_dir/tc_common.sh
+source $lib_dir/lib.sh
+
+require_command dcb
+
+h1=${NETIFS[p1]}
+swp1=${NETIFS[p2]}
+swp2=${NETIFS[p3]}
+h2=${NETIFS[p4]}
+
+H1_IPV4="192.0.2.1"
+H2_IPV4="192.0.2.2"
+H1_IPV6="2001:db8:1::1"
+H2_IPV6="2001:db8:1::2"
+
+# On h1_ and h2_create do not set IP addresses to avoid interaction with the
+# system, to keep packet counters clean.
+h1_create()
+{
+	simple_if_init $h1
+	sysctl_set net.ipv6.conf.${h1}.disable_ipv6 1
+	# Get the MAC address of the interface to use it with mausezahn
+	h1_mac=$(ip -j link show dev ${h1} | jq -e '.[].address')
+}
+
+h1_destroy()
+{
+	sysctl_restore net.ipv6.conf.${h1}.disable_ipv6
+	simple_if_fini $h1
+}
+
+h2_create()
+{
+	simple_if_init $h2
+	sysctl_set net.ipv6.conf.${h2}.disable_ipv6 1
+	h2_mac=$(ip -j link show dev ${h2} | jq -e '.[].address')
+}
+
+h2_destroy()
+{
+	sysctl_restore net.ipv6.conf.${h2}.disable_ipv6
+	simple_if_fini $h2
+}
+
+switch_create()
+{
+	ip link set ${swp1} up
+	ip link set ${swp2} up
+	sysctl_set net.ipv6.conf.${swp1}.disable_ipv6 1
+	sysctl_set net.ipv6.conf.${swp2}.disable_ipv6 1
+
+	# Ports should trust VLAN PCP even with vlan_filtering=0
+	ip link add br0 type bridge
+	ip link set ${swp1} master br0
+	ip link set ${swp2} master br0
+	ip link set br0 up
+	sysctl_set net.ipv6.conf.br0.disable_ipv6 1
+}
+
+switch_destroy()
+{
+	sysctl_restore net.ipv6.conf.${swp2}.disable_ipv6
+	sysctl_restore net.ipv6.conf.${swp1}.disable_ipv6
+
+	ip link del br0
+}
+
+setup_prepare()
+{
+	vrf_prepare
+
+	h1_create
+	h2_create
+	switch_create
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	h2_destroy
+	h1_destroy
+	switch_destroy
+
+	vrf_cleanup
+}
+
+set_apptrust_order()
+{
+	local if_name=$1
+	local order=$2
+
+	dcb apptrust set dev ${if_name} order ${order}
+}
+
+# Function to extract a specified field from a given JSON stats string
+extract_network_stat() {
+	local stats_json=$1
+	local field_name=$2
+
+	echo $(echo "$stats_json" | jq -r "$field_name")
+}
+
+run_test()
+{
+	local test_name=$1;
+	local apptrust_order=$2;
+	local port_prio=$3;
+	local dscp_ipv=$4;
+	local dscp=$5;
+	local have_vlan=$6;
+	local pcp_ipv=$7;
+	local vlan_pcp=$8;
+	local ip_v6=$9
+
+	local rx_ipv
+	local tx_ipv
+
+	RET=0
+
+	# Send some packet to populate the switch MAC table
+	$MZ ${h2} -a ${h2_mac} -b ${h1_mac} -p 64 -t icmp echores -c 1
+
+	# Based on the apptrust order, set the expected Internal Priority values
+	# for the RX and TX paths.
+	if [ "${apptrust_order}" == "" ]; then
+		echo "Apptrust order not set."
+		rx_ipv=${port_prio}
+		tx_ipv=${port_prio}
+	elif [ "${apptrust_order}" == "dscp" ]; then
+		echo "Apptrust order is DSCP."
+		rx_ipv=${dscp_ipv}
+		tx_ipv=${dscp_ipv}
+	elif [ "${apptrust_order}" == "pcp" ]; then
+		echo "Apptrust order is PCP."
+		rx_ipv=${pcp_ipv}
+		tx_ipv=${pcp_ipv}
+	elif [ "${apptrust_order}" == "pcp dscp" ]; then
+		echo "Apptrust order is PCP DSCP."
+		if [ ${have_vlan} -eq 1 ]; then
+			rx_ipv=$((dscp_ipv > pcp_ipv ? dscp_ipv : pcp_ipv))
+			tx_ipv=${pcp_ipv}
+		else
+			rx_ipv=${dscp_ipv}
+			tx_ipv=${dscp_ipv}
+		fi
+	else
+		RET=1
+		echo "Error: Unknown apptrust order ${apptrust_order}"
+		log_test "${test_name}"
+		return
+	fi
+
+	# Most/all? of the KSZ switches do not provide per-TC counters. There
+	# are only tx_hi and rx_hi counters, which are used to count packets
+	# which are considered as high priority and most likely not assigned
+	# to the queue 0.
+	# On the ingress path, packets seem to get high priority status
+	# independently of the DSCP or PCP global mapping. On the egress path,
+	# the high priority status is assigned based on the DSCP or PCP global
+	# map configuration.
+	# The thresholds for the high priority status are not documented, but
+	# it seems that the switch considers packets as high priority on the
+	# ingress path if detected Internal Priority is greater than 0. On the
+	# egress path, the switch considers packets as high priority if
+	# detected Internal Priority is greater than 1.
+	if [ ${rx_ipv} -ge 1 ]; then
+		local expect_rx_high_prio=1
+	else
+		local expect_rx_high_prio=0
+	fi
+
+	if [ ${tx_ipv} -ge 2 ]; then
+		local expect_tx_high_prio=1
+	else
+		local expect_tx_high_prio=0
+	fi
+
+	# Use ip tool to get the current switch packet counters. ethool stats
+	# need to be recalculated to get the correct values.
+	local swp1_stats=$(ip -s -j link show dev ${swp1})
+	local swp2_stats=$(ip -s -j link show dev ${swp2})
+	local swp1_rx_packets_before=$(extract_network_stat "$swp1_stats" \
+				       '.[0].stats64.rx.packets')
+	local swp1_rx_bytes_before=$(extract_network_stat "$swp1_stats" \
+				     '.[0].stats64.rx.bytes')
+	local swp2_tx_packets_before=$(extract_network_stat "$swp2_stats" \
+				       '.[0].stats64.tx.packets')
+	local swp2_tx_bytes_before=$(extract_network_stat "$swp2_stats" \
+				     '.[0].stats64.tx.bytes')
+	local swp1_rx_hi_before=$(ethtool_stats_get ${swp1} "rx_hi")
+	local swp2_tx_hi_before=$(ethtool_stats_get ${swp2} "tx_hi")
+
+	# Assamble the mausezahn command based on the test parameters
+	# For the testis with ipv4 or ipv6, use icmp response packets,
+	# to avoid interaction with the system, to keep packet counters
+	# clean.
+	if [ ${ip_v6} -eq 0 ]; then
+		local ip="-a ${h1_mac} -b ${h2_mac} -A ${H1_IPV4} \
+			  -B ${H2_IPV4} -t icmp unreach,code=1,dscp=${dscp}"
+	else
+		local ip="-6 -a ${h1_mac} -b ${h2_mac} -A ${H1_IPV6} \
+			  -B ${H2_IPV6} -t icmp6 type=1,code=0,dscp=${dscp}"
+	fi
+
+	if [ ${have_vlan} -eq 1 ]; then
+		local vlan_pcp_opt="-Q ${vlan_pcp}:0"
+	else
+		local vlan_pcp_opt=""
+	fi
+	$MZ ${h1} ${ip} -c ${PING_COUNT} -d 10msec ${vlan_pcp_opt}
+
+	# Wait until the switch packet counters are updated
+	sleep 6
+
+	local swp1_stats=$(ip -s -j link show dev ${swp1})
+	local swp2_stats=$(ip -s -j link show dev ${swp2})
+
+	local swp1_rx_packets_after=$(extract_network_stat "$swp1_stats" \
+				      '.[0].stats64.rx.packets')
+	local swp1_rx_bytes_after=$(extract_network_stat "$swp1_stats" \
+				    '.[0].stats64.rx.bytes')
+	local swp2_tx_packets_after=$(extract_network_stat "$swp2_stats" \
+				      '.[0].stats64.tx.packets')
+	local swp2_tx_bytes_after=$(extract_network_stat "$swp2_stats" \
+				    '.[0].stats64.tx.bytes')
+
+	local swp1_rx_packets_diff=$((${swp1_rx_packets_after} - \
+				      ${swp1_rx_packets_before}))
+	local swp2_tx_packets_diff=$((${swp2_tx_packets_after} - \
+				      ${swp2_tx_packets_before}))
+
+	local swp1_rx_hi_after=$(ethtool_stats_get ${swp1} "rx_hi")
+	local swp2_tx_hi_after=$(ethtool_stats_get ${swp2} "tx_hi")
+
+	# Test if any packets were received on swp1, we will rx before and after
+	if [ ${swp1_rx_packets_diff} -lt ${PING_COUNT} ]; then
+		echo "Not expected amount of received packets on ${swp1}"
+		echo "before ${swp1_rx_packets_before} after ${swp1_rx_packets_after}"
+		RET=1
+	fi
+
+	# Test if any packets were transmitted on swp2, we will tx before and after
+	if [ ${swp2_tx_packets_diff} -lt ${PING_COUNT} ]; then
+		echo "Not expected amount of transmitted packets on ${swp2}"
+		echo "before ${swp2_tx_packets_before} after ${swp2_tx_packets_after}"
+		RET=1
+	fi
+
+	# tx/rx_hi counted in bytes. So, we need to compare the difference in bytes
+	local swp1_rx_bytes_diff=$(($swp1_rx_bytes_after - $swp1_rx_bytes_before))
+	local swp2_tx_bytes_diff=$(($swp2_tx_bytes_after - $swp2_tx_bytes_before))
+	local swp1_rx_hi_diff=$(($swp1_rx_hi_after - $swp1_rx_hi_before))
+	local swp2_tx_hi_diff=$(($swp2_tx_hi_after - $swp2_tx_hi_before))
+
+	if [ ${expect_rx_high_prio} -eq 1 ]; then
+		swp1_rx_hi_diff=$((${swp1_rx_hi_diff} - \
+				   ${swp1_rx_packets_diff} * ${ETH_FCS_LEN}))
+		if [ ${swp1_rx_hi_diff} -ne ${swp1_rx_bytes_diff} ]; then
+			echo "Not expected amount of high priority packets received on ${swp1}"
+			echo "RX hi diff: ${swp1_rx_hi_diff}, expected RX bytes diff: ${swp1_rx_bytes_diff}"
+			RET=1
+		fi
+	else
+		if [ ${swp1_rx_hi_diff} -ne 0 ]; then
+			echo "Unexpected amount of high priority packets received on ${swp1}"
+			echo "RX hi diff: ${swp1_rx_hi_diff}, expected 0"
+			RET=1
+		fi
+	fi
+
+	if [ ${expect_tx_high_prio} -eq 1 ]; then
+		swp2_tx_hi_diff=$((${swp2_tx_hi_diff} - \
+				   ${swp2_tx_packets_diff} * ${ETH_FCS_LEN}))
+		if [ ${swp2_tx_hi_diff} -ne ${swp2_tx_bytes_diff} ]; then
+			echo "Not expected amount of high priority packets transmitted on ${swp2}"
+			echo "TX hi diff: ${swp2_tx_hi_diff}, expected TX bytes diff: ${swp2_tx_bytes_diff}"
+			RET=1
+		fi
+	else
+		if [ ${swp2_tx_hi_diff} -ne 0 ]; then
+			echo "Unexpected amount of high priority packets transmitted on ${swp2}"
+			echo "TX hi diff: ${swp2_tx_hi_diff}, expected 0"
+			RET=1
+		fi
+	fi
+
+	log_test "${test_name}"
+}
+
+run_test_dscp()
+{
+	# IPv4 test
+	run_test "$1" "$2" "$3" "$4" "$5" 0 0 0 0
+	# IPv6 test
+	run_test "$1" "$2" "$3" "$4" "$5" 0 0 0 1
+}
+
+run_test_dscp_pcp()
+{
+	# IPv4 test
+	run_test "$1" "$2" "$3" "$4" "$5" 1 "$6" "$7" 0
+	# IPv6 test
+	run_test "$1" "$2" "$3" "$4" "$5" 1 "$6" "$7" 1
+}
+
+port_default_prio_get()
+{
+	local if_name=$1
+	local prio
+
+	prio="$(dcb -j app show dev ${if_name} default-prio | \
+		jq '.default_prio[]')"
+	if [ -z "${prio}" ]; then
+		prio=0
+	fi
+
+	echo ${prio}
+}
+
+test_port_default()
+{
+	local orig_apptrust=$(port_get_default_apptrust ${swp1})
+	local orig_prio=$(port_default_prio_get ${swp1})
+	local apptrust_order=""
+
+	RET=0
+
+	# Make sure no other priority sources will interfere with the test
+	set_apptrust_order ${swp1} "${apptrust_order}"
+
+	for val in $(seq 0 7); do
+		dcb app replace dev ${swp1} default-prio ${val}
+		if [ $val -ne $(port_default_prio_get ${swp1}) ]; then
+			RET=1
+			break
+		fi
+
+		run_test_dscp "Port-default QoS classification, prio: ${val}" \
+			"${apptrust_order}" ${val} 0 0
+	done
+
+	set_apptrust_order ${swp1} "${orig_apptrust}"
+	if [[ "$orig_apptrust" != "$(port_get_default_apptrust ${swp1})" ]]; then
+		RET=1
+	fi
+
+	dcb app replace dev ${swp1} default-prio ${orig_prio}
+	if [ $orig_prio -ne $(port_default_prio_get ${swp1}) ]; then
+		RET=1
+	fi
+
+	log_test "Port-default QoS classification"
+}
+
+port_get_default_apptrust()
+{
+	local if_name=$1
+
+	dcb -j apptrust show dev ${if_name} | jq -r '.order[]' | \
+		tr '\n' ' ' | xargs
+}
+
+test_port_apptrust()
+{
+	local original_dscp_prios_swp1=$(get_dscp_prios ${swp1})
+	local orig_apptrust=$(port_get_default_apptrust ${swp1})
+	local orig_port_prio=$(port_default_prio_get ${swp1})
+	local order_variants=("pcp dscp" "dscp" "pcp")
+	local apptrust_order
+	local port_prio
+	local dscp_prio
+	local pcp_prio
+	local dscp
+	local pcp
+
+	RET=0
+
+	# First, test if apptrust configuration as taken by the kernel
+	for order in "${order_variants[@]}"; do
+		set_apptrust_order ${swp1} "${order}"
+		if [[ "$order" != "$(port_get_default_apptrust ${swp1})" ]]; then
+			RET=1
+			break
+		fi
+	done
+
+	log_test "Apptrust, supported variants"
+
+	# To test if the apptrust configuration is working as expected, we need
+	# to set DSCP priorities for the switch port.
+	init_dscp_prios "${swp1}" "${original_dscp_prios_swp1}"
+
+	# Start with a simple test where all apptrust sources are disabled
+	# default port priority is 0, DSCP priority is mapped to 7.
+	# No high priority packets should be received or transmitted.
+	port_prio=0
+	dscp_prio=7
+	dscp=4
+
+	dcb app replace dev ${swp1} default-prio ${port_prio}
+	dcb app replace dev ${swp1} dscp-prio ${dscp}:${dscp_prio}
+
+	apptrust_order=""
+	set_apptrust_order ${swp1} "${apptrust_order}"
+	# Test with apptrust sources disabled, Packets should get port default
+	# priority which is 0
+	run_test_dscp "Apptrust, all disabled. DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp}
+
+	apptrust_order="pcp"
+	set_apptrust_order ${swp1} "${apptrust_order}"
+	# If PCP is enabled, packets should get PCP priority, which is not
+	# set in this test (no VLAN tags are present in the packet). No high
+	# priority packets should be received or transmitted.
+	run_test_dscp "Apptrust, PCP enabled. DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp}
+
+	apptrust_order="dscp"
+	set_apptrust_order ${swp1} "${apptrust_order}"
+	# If DSCP is enabled, packets should get DSCP priority which is set to 7
+	# in this test. High priority packets should be received and transmitted.
+	run_test_dscp "Apptrust, DSCP enabled. DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp}
+
+	apptrust_order="pcp dscp"
+	set_apptrust_order ${swp1} "${apptrust_order}"
+	# If PCP and DSCP are enabled, PCP would have higher apptrust priority
+	# so packets should get PCP priority. But in this test VLAN PCP is not
+	# set, so it should get DSCP priority which is set to 7. High priority
+	# packets should be received and transmitted.
+	run_test_dscp "Apptrust, PCP and DSCP are enabled. DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp}
+
+	# If VLAN PCP is set, it should have higher apptrust priority than DSCP
+	# so packets should get VLAN PCP priority. Send packets with VLAN PCP
+	# set to 0, DSCP set to 7. Packets should get VLAN PCP priority.
+	# No high priority packets should be transmitted. Due to nature of the
+	# switch, high priority packets will be received.
+	pcp_prio=0
+	pcp=0
+	run_test_dscp_pcp "Apptrust, PCP and DSCP are enabled. PCP ${pcp_prio}, DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp} ${pcp_prio} ${pcp}
+
+	# If VLAN PCP is set to 7, it should have higher apptrust priority than
+	# DSCP so packets should get VLAN PCP priority. Send packets with VLAN
+	# PCP set to 7, DSCP set to 7. Packets should get VLAN PCP priority.
+	# High priority packets should be received and transmitted.
+	pcp_prio=7
+	pcp=7
+	run_test_dscp_pcp "Apptrust, PCP and DSCP are enabled. PCP ${pcp_prio}, DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp} ${pcp_prio} ${pcp}
+	# Now make sure that the switch is able to handle the case where DSCP
+	# priority is set to 0 and PCP priority is set to 7. Packets should get
+	# PCP priority. High priority packets should be received and transmitted.
+	dscp_prio=0
+	dcb app replace dev ${swp1} dscp-prio ${dscp}:${dscp_prio}
+	run_test_dscp_pcp "Apptrust, PCP and DSCP are enabled. PCP ${pcp_prio}, DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp} ${pcp_prio} ${pcp}
+	# If both VLAN PCP and DSCP are set to 0, packets should get 0 priority.
+	# No high priority packets should be received or transmitted.
+	pcp_prio=0
+	pcp=0
+	run_test_dscp_pcp "Apptrust, PCP and DSCP are enabled. PCP ${pcp_prio}, DSCP-prio ${dscp}:${dscp_prio}" \
+		"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp} ${pcp_prio} ${pcp}
+
+	# Restore original priorities
+	if ! restore_priorities "${swp1}" "${original_dscp_prios_swp1}"; then
+		RET=1
+	fi
+
+	set_apptrust_order ${swp1} "${orig_apptrust}"
+	if [ "$orig_apptrust" != "$(port_get_default_apptrust ${swp1})" ]; then
+		RET=1
+	fi
+
+	dcb app replace dev ${swp1} default-prio ${orig_port_prio}
+	if [ $orig_port_prio -ne $(port_default_prio_get ${swp1}) ]; then
+		RET=1
+	fi
+
+	log_test "Apptrust, restore original settings"
+}
+
+# Function to get current DSCP priorities
+get_dscp_prios() {
+	local if_name=$1
+	dcb -j app show dev ${if_name} | jq -c '.dscp_prio'
+}
+
+# Function to set a specific DSCP priority on a device
+replace_dscp_prio() {
+	local if_name=$1
+	local dscp=$2
+	local prio=$3
+	dcb app replace dev ${if_name} dscp-prio ${dscp}:${prio}
+}
+
+# Function to compare DSCP maps
+compare_dscp_maps() {
+	local old_json=$1
+	local new_json=$2
+	local dscp=$3
+	local prio=$4
+
+	# Create a modified old_json with the expected change for comparison
+	local modified_old_json=$(echo "$old_json" |
+		jq --argjson dscp $dscp --argjson prio $prio \
+			'map(if .[0] == $dscp then [$dscp, $prio] else . end)' |
+		tr -d " \n")
+
+	# Compare new_json with the modified_old_json
+	if [[ "$modified_old_json" == "$new_json" ]]; then
+		return 0
+	else
+		return 1
+	fi
+}
+
+# Function to set DSCP priorities
+set_and_verify_dscp() {
+	local port=$1
+	local dscp=$2
+	local new_prio=$3
+
+	local old_prios=$(get_dscp_prios $port)
+
+	replace_dscp_prio "$port" $dscp $new_prio
+
+	# Fetch current settings and compare
+	local current_prios=$(get_dscp_prios $port)
+	if ! compare_dscp_maps "$old_prios" "$current_prios" $dscp $new_prio; then
+		echo "Error: Unintended changes detected in DSCP map for $port after setting DSCP $dscp to $new_prio."
+		return 1
+	fi
+	return 0
+}
+
+# Function to restore original priorities
+restore_priorities() {
+	local port=$1
+	local original_prios=$2
+
+	echo "Removing test artifacts for $port"
+	local current_prios=$(get_dscp_prios $port)
+	local prio_str=$(echo "$current_prios" |
+		jq -r 'map("\(.[0]):\(.[1])") | join(" ")')
+	dcb app del dev $port dscp-prio $prio_str
+
+	echo "Restoring original DSCP priorities for $port"
+	local restore_str=$(echo "$original_prios" |
+		jq -r 'map("\(.[0]):\(.[1])") | join(" ")')
+	dcb app add dev $port dscp-prio $restore_str
+
+	local current_prios=$(get_dscp_prios $port)
+	if [[ "$original_prios" != "$current_prios" ]]; then
+		echo "Error: Failed to restore original DSCP priorities for $port"
+		return 1
+	fi
+	return 0
+}
+
+# Initialize DSCP priorities. Set them to predictable values for testing.
+init_dscp_prios() {
+	local port=$1
+	local original_prios=$2
+
+	echo "Removing any existing DSCP priority mappins for $port"
+	local prio_str=$(echo "$original_prios" |
+		jq -r 'map("\(.[0]):\(.[1])") | join(" ")')
+	dcb app del dev $port dscp-prio $prio_str
+
+	# Initialize DSCP priorities list
+	local dscp_prios=""
+	for dscp in {0..63}; do
+		dscp_prios+=("$dscp:0")
+	done
+
+	echo "Setting initial DSCP priorities map to 0 for $port"
+	dcb app add dev $port dscp-prio ${dscp_prios[@]}
+}
+
+# Main function to test global DSCP map across specified ports
+test_global_dscp_map() {
+	local ports=("$swp1" "$swp2")
+	local original_dscp_prios_port0=$(get_dscp_prios ${ports[0]})
+	local orig_apptrust=$(port_get_default_apptrust ${swp1})
+	local orig_port_prio=$(port_default_prio_get ${swp1})
+	local apptrust_order="dscp"
+	local port_prio=0
+	local dscp_prio
+	local dscp
+
+	RET=0
+
+	set_apptrust_order ${swp1} "${apptrust_order}"
+	dcb app replace dev ${swp1} default-prio ${port_prio}
+
+	# Initialize DSCP priorities
+	init_dscp_prios "${ports[0]}" "$original_dscp_prios_port0"
+
+	# Loop over each DSCP index
+	for dscp in {0..63}; do
+		# and test each Internal Priority value
+		for dscp_prio in {0..7}; do
+			# do it for each port. This is to test if the global DSCP map
+			# is accessible from all ports.
+			for port in "${ports[@]}"; do
+				if ! set_and_verify_dscp "$port" $dscp $dscp_prio; then
+					RET=1
+				fi
+			done
+
+			# Test if the DSCP priority is correctly applied to the packets
+			run_test_dscp "DSCP (${dscp}) QoS classification, prio: ${dscp_prio}" \
+				"${apptrust_order}" ${port_prio} ${dscp_prio} ${dscp}
+			if [ ${RET} -eq 1 ]; then
+				break
+			fi
+		done
+	done
+
+	# Restore original priorities
+	if ! restore_priorities "${ports[0]}" "${original_dscp_prios_port0}"; then
+		RET=1
+	fi
+
+	set_apptrust_order ${swp1} "${orig_apptrust}"
+	if [[ "$orig_apptrust" != "$(port_get_default_apptrust ${swp1})" ]]; then
+		RET=1
+	fi
+
+	dcb app replace dev ${swp1} default-prio ${orig_port_prio}
+	if [ $orig_port_prio -ne $(port_default_prio_get ${swp1}) ]; then
+		RET=1
+	fi
+
+	log_test "DSCP global map"
+}
+
+trap cleanup EXIT
+
+ALL_TESTS="
+	test_port_default
+	test_port_apptrust
+	test_global_dscp_map
+"
+
+setup_prepare
+setup_wait
+tests_run
+
+exit $EXIT_STATUS