selftests: mlxsw: Add ingress RIF configuration test for VXLAN

Before layer 2 forwarding, the device classifies an incoming packet to a
FID. After classification, the FID is known, but also all the attributes of
the FID, such as the router interface (RIF) via which a packet that needs
to be routed will ingress the router block.

For VXLAN decapsulation, the FID classification is done according to the
VNI. When a RIF is added on top of a FID, the existing VNI->FID mapping
should be updated by the software with the new RIF. In addition, when a new
mapping is added for FID which already has a RIF, the correct RIF should
be used for it.

Add a test to verify that packets can be routed after decapsulation which
is done after VNI->FID classification, regardless of the order of the
configuration.

 # ./ingress_rif_conf_vxlan.sh
 TEST: Add RIF for existing VNI->FID mapping                         [ OK ]
 TEST: Add VNI->FID mapping for FID with a RIF                       [ OK ]
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Test routing after VXLAN decapsulation and verify that the order of
+# configuration does not impact switch behavior. Verify that RIF is added
+# correctly for existing mapping and that new mapping uses the correct RIF.
+
+# +---------------------------+
+# |                        H1 |
+# |    + $h1                  |
+# |    | 192.0.2.1/28         |
+# +----|----------------------+
+#      |
+# +----|----------------------------------------------------------------------+
+# | SW |                                                                      |
+# | +--|--------------------------------------------------------------------+ |
+# | |  + $swp1                         br1                                  | |
+# | |     vid 10 pvid untagged                                              | |
+# | |                                                                       | |
+# | |                                                                       | |
+# | |                                            + vx4001                   | |
+# | |                                              local 192.0.2.17         | |
+# | |                                              remote 192.0.2.18        | |
+# | |                                              id 104001                | |
+# | |                                              dstport $VXPORT          | |
+# | |                                              vid 4001 pvid untagged   | |
+# | |                                                                       | |
+# | +----------------------------------+------------------------------------+ |
+# |                                    |                                      |
+# | +----------------------------------|------------------------------------+ |
+# | |                                  |                                    | |
+# | |  +-------------------------------+---------------------------------+  | |
+# | |  |                                                                 |  | |
+# | |  + vlan10                                                 vlan4001 +  | |
+# | |    192.0.2.2/28                                                       | |
+# | |                                                                       | |
+# | |                               vrf-green                               | |
+# | +-----------------------------------------------------------------------+ |
+# |                                                                           |
+# |    + $rp1                                       +lo                       |
+# |    | 198.51.100.1/24                             192.0.2.17/32            |
+# +----|----------------------------------------------------------------------+
+#      |
+# +----|--------------------------------------------------------+
+# |    |                                             v$rp2      |
+# |    + $rp2                                                   |
+# |      198.51.100.2/24                                        |
+# |                                                             |
+# +-------------------------------------------------------------+
+
+lib_dir=$(dirname $0)/../../../net/forwarding
+
+ALL_TESTS="
+	vni_fid_map_rif
+	rif_vni_fid_map
+"
+
+NUM_NETIFS=4
+source $lib_dir/lib.sh
+source $lib_dir/tc_common.sh
+source $lib_dir/devlink_lib.sh
+
+: ${VXPORT:=4789}
+export VXPORT
+
+h1_create()
+{
+	simple_if_init $h1 192.0.2.1/28
+}
+
+h1_destroy()
+{
+	simple_if_fini $h1 192.0.2.1/28
+}
+
+switch_create()
+{
+	ip link add name br1 type bridge vlan_filtering 1 vlan_default_pvid 0 \
+		mcast_snooping 0
+	# Make sure the bridge uses the MAC address of the local port and not
+	# that of the VxLAN's device.
+	ip link set dev br1 address $(mac_get $swp1)
+	ip link set dev br1 up
+
+	ip link set dev $rp1 up
+	ip address add dev $rp1 198.51.100.1/24
+
+	ip link set dev $swp1 master br1
+	ip link set dev $swp1 up
+	bridge vlan add vid 10 dev $swp1 pvid untagged
+
+	tc qdisc add dev $swp1 clsact
+
+	ip link add name vx4001 type vxlan id 104001 \
+		local 192.0.2.17 dstport $VXPORT \
+		nolearning noudpcsum tos inherit ttl 100
+	ip link set dev vx4001 up
+
+	ip link set dev vx4001 master br1
+
+	ip address add 192.0.2.17/32 dev lo
+
+	# Create SVIs.
+	vrf_create "vrf-green"
+	ip link set dev vrf-green up
+
+	ip link add link br1 name vlan10 up master vrf-green type vlan id 10
+
+	# Replace neighbor to avoid 1 packet which is forwarded in software due
+	# to "unresolved neigh".
+	ip neigh replace dev vlan10 192.0.2.1 lladdr $(mac_get $h1)
+
+	ip address add 192.0.2.2/28 dev vlan10
+
+	bridge vlan add vid 10 dev br1 self
+	bridge vlan add vid 4001 dev br1 self
+
+	sysctl_set net.ipv4.conf.all.rp_filter 0
+}
+
+switch_destroy()
+{
+	sysctl_restore net.ipv4.conf.all.rp_filter
+
+	bridge vlan del vid 4001 dev br1 self
+	bridge vlan del vid 10 dev br1 self
+
+	ip link del dev vlan10
+
+	vrf_destroy "vrf-green"
+
+	ip address del 192.0.2.17/32 dev lo
+
+	tc qdisc del dev $swp1 clsact
+
+	bridge vlan del vid 10 dev $swp1
+	ip link set dev $swp1 down
+	ip link set dev $swp1 nomaster
+
+	ip link set dev vx4001 nomaster
+
+	ip link set dev vx4001 down
+	ip link del dev vx4001
+
+	ip address del dev $rp1 198.51.100.1/24
+	ip link set dev $rp1 down
+
+	ip link set dev br1 down
+	ip link del dev br1
+}
+
+vrp2_create()
+{
+	simple_if_init $rp2 198.51.100.2/24
+
+	ip route add 192.0.2.17/32 vrf v$rp2 nexthop via 198.51.100.1
+}
+
+vrp2_destroy()
+{
+	ip route del 192.0.2.17/32 vrf v$rp2 nexthop via 198.51.100.1
+
+	simple_if_fini $rp2 198.51.100.2/24
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	rp1=${NETIFS[p3]}
+	rp2=${NETIFS[p4]}
+
+	vrf_prepare
+	forwarding_enable
+
+	h1_create
+	switch_create
+
+	vrp2_create
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	vrp2_destroy
+
+	switch_destroy
+	h1_destroy
+
+	forwarding_restore
+	vrf_cleanup
+}
+
+payload_get()
+{
+	local dest_mac=$(mac_get vlan4001)
+	local src_mac=$(mac_get $rp1)
+
+	p=$(:
+		)"08:"$(                      : VXLAN flags
+		)"00:00:00:"$(                : VXLAN reserved
+		)"01:96:41:"$(                : VXLAN VNI : 104001
+		)"00:"$(                      : VXLAN reserved
+		)"$dest_mac:"$(               : ETH daddr
+		)"$src_mac:"$(                : ETH saddr
+		)"08:00:"$(                   : ETH type
+		)"45:"$(                      : IP version + IHL
+		)"00:"$(                      : IP TOS
+		)"00:54:"$(                   : IP total length
+		)"3f:49:"$(                   : IP identification
+		)"00:00:"$(                   : IP flags + frag off
+		)"3f:"$(                      : IP TTL
+		)"01:"$(                      : IP proto
+		)"50:21:"$(                   : IP header csum
+		)"c6:33:64:0a:"$(             : IP saddr: 198.51.100.10
+		)"c0:00:02:01:"$(             : IP daddr: 192.0.2.1
+	)
+	echo $p
+}
+
+vlan_rif_add()
+{
+	rifs_occ_t0=$(devlink_resource_occ_get rifs)
+
+	ip link add link br1 name vlan4001 up master vrf-green \
+		type vlan id 4001
+
+	rifs_occ_t1=$(devlink_resource_occ_get rifs)
+	expected_rifs=$((rifs_occ_t0 + 1))
+
+	[[ $expected_rifs -eq $rifs_occ_t1 ]]
+	check_err $? "Expected $expected_rifs RIFs, $rifs_occ_t1 are used"
+}
+
+vlan_rif_del()
+{
+	ip link del dev vlan4001
+}
+
+vni_fid_map_rif()
+{
+	local rp1_mac=$(mac_get $rp1)
+
+	RET=0
+
+	# First add VNI->FID mapping to the FID of VLAN 4001
+	bridge vlan add vid 4001 dev vx4001 pvid untagged
+
+	# Add a RIF to the FID with VNI->FID mapping
+	vlan_rif_add
+
+	tc filter add dev $swp1 egress protocol ip pref 1 handle 101 \
+		flower skip_sw dst_ip 192.0.2.1 action pass
+
+	payload=$(payload_get)
+	ip vrf exec v$rp2 $MZ $rp2 -c 10 -d 1msec -b $rp1_mac \
+		-B 192.0.2.17 -A 192.0.2.18 \
+		-t udp sp=12345,dp=$VXPORT,p=$payload -q
+
+	tc_check_at_least_x_packets "dev $swp1 egress" 101 10
+	check_err $? "Packets were not routed in hardware"
+
+	log_test "Add RIF for existing VNI->FID mapping"
+
+	tc filter del dev $swp1 egress
+
+	bridge vlan del vid 4001 dev vx4001 pvid untagged
+	vlan_rif_del
+}
+
+rif_vni_fid_map()
+{
+	local rp1_mac=$(mac_get $rp1)
+
+	RET=0
+
+	# First add a RIF to the FID of VLAN 4001
+	vlan_rif_add
+
+	# Add VNI->FID mapping to FID with a RIF
+	bridge vlan add vid 4001 dev vx4001 pvid untagged
+
+	tc filter add dev $swp1 egress protocol ip pref 1 handle 101 \
+		flower skip_sw dst_ip 192.0.2.1 action pass
+
+	payload=$(payload_get)
+	ip vrf exec v$rp2 $MZ $rp2 -c 10 -d 1msec -b $rp1_mac \
+		-B 192.0.2.17 -A 192.0.2.18 \
+		-t udp sp=12345,dp=$VXPORT,p=$payload -q
+
+	tc_check_at_least_x_packets "dev $swp1 egress" 101 10
+	check_err $? "Packets were not routed in hardware"
+
+	log_test "Add VNI->FID mapping for FID with a RIF"
+
+	tc filter del dev $swp1 egress
+
+	bridge vlan del vid 4001 dev vx4001 pvid untagged
+	vlan_rif_del
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS