selftests: Add an occupancy test for RIF MAC profiles

When all the RIF MAC profiles are in use, test that it is possible to
change the MAC of a netdev (i.e., a RIF) when its MAC profile is not
shared with other RIFs. Test that replacement fails when the MAC profile
is shared.
Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+lib_dir=$(dirname $0)/../../../net/forwarding
+
+ALL_TESTS="
+	rif_mac_profile_edit_test
+"
+NUM_NETIFS=2
+source $lib_dir/lib.sh
+source $lib_dir/devlink_lib.sh
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	h2=${NETIFS[p2]}
+
+	# Disable IPv6 on the two interfaces to avoid IPv6 link-local addresses
+	# being generated and RIFs being created
+	sysctl_set net.ipv6.conf.$h1.disable_ipv6 1
+	sysctl_set net.ipv6.conf.$h2.disable_ipv6 1
+
+	ip link set $h1 up
+	ip link set $h2 up
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	ip link set $h2 down
+	ip link set $h1 down
+
+	sysctl_restore net.ipv6.conf.$h2.disable_ipv6
+	sysctl_restore net.ipv6.conf.$h1.disable_ipv6
+
+	# Reload in order to clean all the RIFs and RIF MAC profiles created
+	devlink_reload
+}
+
+create_max_rif_mac_profiles()
+{
+	local count=$1; shift
+	local batch_file="$(mktemp)"
+
+	for ((i = 1; i <= count; i++)); do
+		vlan=$(( i*10 ))
+		m=$(( i*11 ))
+
+		cat >> $batch_file <<-EOF
+			link add link $h1 name $h1.$vlan \
+				address 00:$m:$m:$m:$m:$m type vlan id $vlan
+			address add 192.0.$m.1/24 dev $h1.$vlan
+		EOF
+	done
+
+	ip -b $batch_file &> /dev/null
+	rm -f $batch_file
+}
+
+rif_mac_profile_replacement_test()
+{
+	local h1_10_mac=$(mac_get $h1.10)
+
+	RET=0
+
+	ip link set $h1.10 address 00:12:34:56:78:99
+	check_err $?
+
+	log_test "RIF MAC profile replacement"
+
+	ip link set $h1.10 address $h1_10_mac
+}
+
+rif_mac_profile_shared_replacement_test()
+{
+	local count=$1; shift
+	local i=$((count + 1))
+	local vlan=$(( i*10 ))
+	local m=11
+
+	RET=0
+
+	# Create a VLAN netdevice that has the same MAC as the first one.
+	ip link add link $h1 name $h1.$vlan address 00:$m:$m:$m:$m:$m \
+		type vlan id $vlan
+	ip address add 192.0.$m.1/24 dev $h1.$vlan
+
+	# MAC replacement should fail because all the MAC profiles are in use
+	# and the profile is shared between multiple RIFs
+	m=$(( i*11 ))
+	ip link set $h1.$vlan address 00:$m:$m:$m:$m:$m &> /dev/null
+	check_fail $?
+
+	log_test "RIF MAC profile shared replacement"
+
+	ip link del dev $h1.$vlan
+}
+
+rif_mac_profile_edit_test()
+{
+	local count=$(devlink_resource_size_get rif_mac_profiles)
+
+	create_max_rif_mac_profiles $count
+
+	rif_mac_profile_replacement_test
+	rif_mac_profile_shared_replacement_test $count
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS