selftests: netdevsim: Add test for FIB offload API

Test various aspects of the FIB offload API on top of the netdevsim
implementation. Both good and bad flows are tested.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/netdevsim/fib.sh

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# This test is for checking the FIB offload API. It makes use of netdevsim
+# which registers a listener to the FIB notification chain.
+
+lib_dir=$(dirname $0)/../../../net/forwarding
+
+ALL_TESTS="
+	ipv4_identical_routes
+	ipv4_tos
+	ipv4_metric
+	ipv4_replace
+	ipv4_delete
+	ipv4_plen
+	ipv4_replay
+	ipv4_flush
+	ipv4_error_path
+	ipv6_add
+	ipv6_metric
+	ipv6_append_single
+	ipv6_replace_single
+	ipv6_metric_multipath
+	ipv6_append_multipath
+	ipv6_replace_multipath
+	ipv6_append_multipath_to_single
+	ipv6_delete_single
+	ipv6_delete_multipath
+	ipv6_replay_single
+	ipv6_replay_multipath
+	ipv6_error_path
+"
+NETDEVSIM_PATH=/sys/bus/netdevsim/
+DEV_ADDR=1337
+DEV=netdevsim${DEV_ADDR}
+DEVLINK_DEV=netdevsim/${DEV}
+SYSFS_NET_DIR=/sys/bus/netdevsim/devices/$DEV/net/
+NUM_NETIFS=0
+source $lib_dir/lib.sh
+source $lib_dir/devlink_lib.sh
+source $lib_dir/fib_offload_lib.sh
+
+ipv4_identical_routes()
+{
+	fib_ipv4_identical_routes_test "testns1"
+}
+
+ipv4_tos()
+{
+	fib_ipv4_tos_test "testns1"
+}
+
+ipv4_metric()
+{
+	fib_ipv4_metric_test "testns1"
+}
+
+ipv4_replace()
+{
+	fib_ipv4_replace_test "testns1"
+}
+
+ipv4_delete()
+{
+	fib_ipv4_delete_test "testns1"
+}
+
+ipv4_plen()
+{
+	fib_ipv4_plen_test "testns1"
+}
+
+ipv4_replay_metric()
+{
+	fib_ipv4_replay_metric_test "testns1" "$DEVLINK_DEV"
+}
+
+ipv4_replay_tos()
+{
+	fib_ipv4_replay_tos_test "testns1" "$DEVLINK_DEV"
+}
+
+ipv4_replay_plen()
+{
+	fib_ipv4_replay_plen_test "testns1" "$DEVLINK_DEV"
+}
+
+ipv4_replay()
+{
+	ipv4_replay_metric
+	ipv4_replay_tos
+	ipv4_replay_plen
+}
+
+ipv4_flush()
+{
+	fib_ipv4_flush_test "testns1"
+}
+
+ipv4_error_path_add()
+{
+	local lsb
+
+	RET=0
+
+	ip -n testns1 link add name dummy1 type dummy
+	ip -n testns1 link set dev dummy1 up
+
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv4/fib size 10
+	devlink -N testns1 dev reload $DEVLINK_DEV
+
+	for lsb in $(seq 1 20); do
+		ip -n testns1 route add 192.0.2.${lsb}/32 dev dummy1 \
+			&> /dev/null
+	done
+
+	log_test "IPv4 error path - add"
+
+	ip -n testns1 link del dev dummy1
+}
+
+ipv4_error_path_replay()
+{
+	local lsb
+
+	RET=0
+
+	ip -n testns1 link add name dummy1 type dummy
+	ip -n testns1 link set dev dummy1 up
+
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv4/fib size 100
+	devlink -N testns1 dev reload $DEVLINK_DEV
+
+	for lsb in $(seq 1 20); do
+		ip -n testns1 route add 192.0.2.${lsb}/32 dev dummy1
+	done
+
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv4/fib size 10
+	devlink -N testns1 dev reload $DEVLINK_DEV &> /dev/null
+
+	log_test "IPv4 error path - replay"
+
+	ip -n testns1 link del dev dummy1
+
+	# Successfully reload after deleting all the routes.
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv4/fib size 100
+	devlink -N testns1 dev reload $DEVLINK_DEV
+}
+
+ipv4_error_path()
+{
+	# Test the different error paths of the notifiers by limiting the size
+	# of the "IPv4/fib" resource.
+	ipv4_error_path_add
+	ipv4_error_path_replay
+}
+
+ipv6_add()
+{
+	fib_ipv6_add_test "testns1"
+}
+
+ipv6_metric()
+{
+	fib_ipv6_metric_test "testns1"
+}
+
+ipv6_append_single()
+{
+	fib_ipv6_append_single_test "testns1"
+}
+
+ipv6_replace_single()
+{
+	fib_ipv6_replace_single_test "testns1"
+}
+
+ipv6_metric_multipath()
+{
+	fib_ipv6_metric_multipath_test "testns1"
+}
+
+ipv6_append_multipath()
+{
+	fib_ipv6_append_multipath_test "testns1"
+}
+
+ipv6_replace_multipath()
+{
+	fib_ipv6_replace_multipath_test "testns1"
+}
+
+ipv6_append_multipath_to_single()
+{
+	fib_ipv6_append_multipath_to_single_test "testns1"
+}
+
+ipv6_delete_single()
+{
+	fib_ipv6_delete_single_test "testns1"
+}
+
+ipv6_delete_multipath()
+{
+	fib_ipv6_delete_multipath_test "testns1"
+}
+
+ipv6_replay_single()
+{
+	fib_ipv6_replay_single_test "testns1" "$DEVLINK_DEV"
+}
+
+ipv6_replay_multipath()
+{
+	fib_ipv6_replay_multipath_test "testns1" "$DEVLINK_DEV"
+}
+
+ipv6_error_path_add_single()
+{
+	local lsb
+
+	RET=0
+
+	ip -n testns1 link add name dummy1 type dummy
+	ip -n testns1 link set dev dummy1 up
+
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv6/fib size 10
+	devlink -N testns1 dev reload $DEVLINK_DEV
+
+	for lsb in $(seq 1 20); do
+		ip -n testns1 route add 2001:db8:1::${lsb}/128 dev dummy1 \
+			&> /dev/null
+	done
+
+	log_test "IPv6 error path - add single"
+
+	ip -n testns1 link del dev dummy1
+}
+
+ipv6_error_path_add_multipath()
+{
+	local lsb
+
+	RET=0
+
+	for i in $(seq 1 2); do
+		ip -n testns1 link add name dummy$i type dummy
+		ip -n testns1 link set dev dummy$i up
+		ip -n testns1 address add 2001:db8:$i::1/64 dev dummy$i
+	done
+
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv6/fib size 10
+	devlink -N testns1 dev reload $DEVLINK_DEV
+
+	for lsb in $(seq 1 20); do
+		ip -n testns1 route add 2001:db8:10::${lsb}/128 \
+			nexthop via 2001:db8:1::2 dev dummy1 \
+			nexthop via 2001:db8:2::2 dev dummy2 &> /dev/null
+	done
+
+	log_test "IPv6 error path - add multipath"
+
+	for i in $(seq 1 2); do
+		ip -n testns1 link del dev dummy$i
+	done
+}
+
+ipv6_error_path_replay()
+{
+	local lsb
+
+	RET=0
+
+	ip -n testns1 link add name dummy1 type dummy
+	ip -n testns1 link set dev dummy1 up
+
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv6/fib size 100
+	devlink -N testns1 dev reload $DEVLINK_DEV
+
+	for lsb in $(seq 1 20); do
+		ip -n testns1 route add 2001:db8:1::${lsb}/128 dev dummy1
+	done
+
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv6/fib size 10
+	devlink -N testns1 dev reload $DEVLINK_DEV &> /dev/null
+
+	log_test "IPv6 error path - replay"
+
+	ip -n testns1 link del dev dummy1
+
+	# Successfully reload after deleting all the routes.
+	devlink -N testns1 resource set $DEVLINK_DEV path IPv6/fib size 100
+	devlink -N testns1 dev reload $DEVLINK_DEV
+}
+
+ipv6_error_path()
+{
+	# Test the different error paths of the notifiers by limiting the size
+	# of the "IPv6/fib" resource.
+	ipv6_error_path_add_single
+	ipv6_error_path_add_multipath
+	ipv6_error_path_replay
+}
+
+setup_prepare()
+{
+	local netdev
+
+	modprobe netdevsim &> /dev/null
+
+	echo "$DEV_ADDR 1" > ${NETDEVSIM_PATH}/new_device
+	while [ ! -d $SYSFS_NET_DIR ] ; do :; done
+
+	ip netns add testns1
+	if [ $? -ne 0 ]; then
+		echo "Failed to add netns \"testns1\""
+		exit 1
+	fi
+
+	devlink dev reload $DEVLINK_DEV netns testns1
+	if [ $? -ne 0 ]; then
+		echo "Failed to reload into netns \"testns1\""
+		exit 1
+	fi
+}
+
+cleanup()
+{
+	pre_cleanup
+	ip netns del testns1
+	echo "$DEV_ADDR" > ${NETDEVSIM_PATH}/del_device
+	modprobe -r netdevsim &> /dev/null
+}
+
+trap cleanup EXIT
+
+setup_prepare
+
+tests_run
+
+exit $EXIT_STATUS